JP2016118346A - Pulverized fuel manufacturing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pulverized fuel manufacturing device that can properly dry, pulverize, and transfer a raw material even if the moisture content of the raw material to be processed varies.SOLUTION: A pulverized fuel manufacturing device is provided with: a coal pulverizer 12 that pulverizes raw coal to form pulverized coal; a high-temperature air supply adjustment device 31 that supplies high-temperature air to the coal pulverizer 12; a transfer line 32 that transfers the pulverized coal and the high-temperature air discharged from the coal pulverizer 12; a dust collection device 33 that separates the pulverized coal and the high-temperature air transferred by the transfer line 32; a bin system 13 that retains the pulverized coal separated by the dust collection device 33; and a moisture content measurement device 101 that measures the moisture content of the pulverized coal separated by the dust collection device 33.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pulverized fuel production apparatus for producing pulverized fuel by crushing raw materials while drying.

  For example, a combined coal gasification power generation facility is a power generation facility that aims to further increase the efficiency and environmental performance compared to conventional coal-fired power generation by gasifying coal and combining it with combined cycle power generation. This coal gasification combined cycle power generation facility has a great merit that it can use coal with abundant resources, and it is known that the merit can be further increased by expanding the applicable coal types.

  Conventional coal gasification combined power generation facilities generally have a coal supply device, a drying device, a coal gasification furnace, a gas purification device, a gas turbine facility, a steam turbine facility, an exhaust heat recovery boiler, a gas purification device, and the like. ing. Accordingly, the coal is pulverized while being dried, supplied to the coal gasifier as pulverized coal, and air is taken in. The coal gas is combusted and gasified in the coal gasifier, and the produced gas (combustible gas). ) Is generated. Then, the product gas is purified and then supplied to the gas turbine equipment to burn and generate high-temperature and high-pressure combustion gas to drive the turbine. The exhaust gas after driving the turbine recovers thermal energy by the exhaust heat recovery boiler, generates steam and supplies it to the steam turbine equipment, and drives the turbine. As a result, power generation is performed. On the other hand, the exhaust gas from which the thermal energy has been recovered is released into the atmosphere through a chimney after harmful substances are removed by the gas purification device.

  By the way, the coal used in such a coal gasification combined power generation facility is not only a high-grade coal (high-grade coal) having a high calorific value such as bituminous coal and anthracite, but also a comparison such as sub-bituminous coal and lignite. There is a low-grade coal (low-grade coal) with a low calorific value. If this low-grade coal has a large amount of moisture to be brought in and is not sufficiently dried, the transport to the gasification furnace becomes unstable and the transport system may be blocked.

  As a boiler using such a coal with a lot of moisture, there is one described in the following patent documents. The method of controlling the primary air temperature at the outlet of the pulverized coal machine for the boiler described in Patent Document 1 mixes the exhaust gas extracted from the upstream of the air preheater into the primary air fed into the pulverized coal machine, and upstream of the economizer The exhaust gas temperature at the inlet of the air preheater is adjusted by bypassing part of the exhaust gas. Moreover, the coal drying method and the drying equipment described in Patent Document 2 are such that the low quality coal is dried to 80 to 150 ° C. using the combustion exhaust gas after passing through the air heater of the coal combustion boiler, and the exhaust gas after drying is used as the coal combustion boiler. It supplies to the electric dust collector.

Japanese Patent Publication No. 06-017741 JP-A-10-281443

  As described above, the coal gasification combined power generation facility produces pulverized coal by pulverizing this coal with a roller while drying the coal with high-temperature air supplied to the inside of the pulverizer. After temporary storage, an appropriate amount of pulverized coal is supplied to the coal gasifier at a predetermined timing. Therefore, the temperature of the high-temperature air supplied to the pulverizer needs to be adjusted not only to ensure stable drying and pulverization of coal by the pulverizer but also to take into account stable storage and conveyance of pulverized coal. However, in particular, low-grade coal and the like have variations in moisture content, making it difficult to control the temperature of high-temperature air for drying, pulverizing, storing, and transporting coal.

  The present invention solves the above-described problems, and an object of the present invention is to provide a pulverized fuel production apparatus that can appropriately dry, pulverize, and transport a raw material even if the moisture content of the raw material to be processed fluctuates. And

  The pulverized fuel production apparatus of the present invention for achieving the above object includes a crusher that crushes raw materials to form a pulverized fuel, a high-temperature air supply device that supplies high-temperature air to the crusher, and the crusher. A transport line that transports the discharged pulverized fuel and high-temperature air, a separation device that separates the pulverized fuel transported by the transport line and the high-temperature air, and a storage unit that stores the pulverized fuel separated by the separation device; And a moisture measuring device that measures the moisture content of the pulverized fuel separated by the separating device.

  Therefore, when the high-temperature air supply device supplies high-temperature air to the crusher, the crusher dries the raw material with high-temperature air and crushes it to form pulverized fuel, and the pulverized fuel and high-temperature air are transferred to the separation device through the transfer line. Then, the separation device separates the pulverized fuel and the high-temperature air, and the separated pulverized fuel is stored in the storage unit. At this time, the moisture measuring device can grasp the dry state of the pulverized fuel by measuring the moisture content of the pulverized fuel separated by the separation device, such as the temperature and supply amount of high-temperature air, the supply amount of raw materials, etc. By adjusting this, the finely divided fuel can be maintained in an optimal dry state. As a result, even if the moisture content of the raw material to be processed varies, the raw material can be appropriately dried and pulverized and conveyed.

  In the pulverized fuel production apparatus of the present invention, the high-temperature air adjustment device that adjusts the temperature or flow rate of the high-temperature air supplied to the crusher by the high-temperature air supply device, and the high-temperature air according to the amount of water measured by the moisture measurement device. And a control device for controlling the air conditioning device.

  Therefore, the control device controls the high-temperature air adjusting device in accordance with the moisture content of the pulverized fuel measured by the moisture measuring device. For example, when the moisture content of the pulverized fuel has a deviation from the preset optimum moisture content, the temperature or flow rate of the hot air supplied to the crusher is adjusted by the hot air conditioning device.

  In the pulverized fuel production apparatus of the present invention, a raw material adjusting device that adjusts the amount of raw material supplied to the crusher and a control device that controls the raw material adjusting device according to the amount of water measured by the moisture measuring device are provided. It is characterized by being able to.

  Therefore, the control device controls the raw material adjusting device according to the moisture content of the pulverized fuel measured by the moisture measuring device. For example, when the moisture content of the pulverized fuel has a deviation from the preset optimum moisture content, the amount of the raw material supplied to the crusher is adjusted by the raw material adjusting device.

  In the pulverized fuel production apparatus of the present invention, the moisture measuring device includes a measurement window provided in a pulverized fuel conveyance path in the separation device, a light emission detection unit that irradiates light through the measurement window and receives reflected light, and light. And a moisture amount calculation unit for calculating the moisture content of the pulverized fuel based on the irradiation amount and the reflection amount.

  Therefore, the light emission detection unit irradiates light through the measurement window and receives reflected light, and the water content calculation unit calculates the water content of the pulverized fuel on the basis of the light irradiation amount and the reflection amount. The amount of water in the pulverized fuel can be easily determined.

  In the pulverized fuel production apparatus of the present invention, the measurement window is provided in a housing of the separation device or a passage disposed in the housing.

  Therefore, by providing the measurement window in the housing of the separation device or the passage in the housing, the moisture content of the pulverized fuel can be obtained easily and with high accuracy.

  In the pulverized fuel production apparatus of the present invention, a cleaning device for cleaning the measurement window is provided.

  Therefore, by cleaning the measurement window with the cleaning device, contamination of the measurement window due to the passage of pulverized fuel is prevented, and moisture measurement can be performed with high accuracy.

  In the pulverized fuel manufacturing apparatus according to the present invention, the cleaning device includes a scraper that moves along the inner surface of the measurement window, and a gas ejection portion that ejects purge gas toward the inner surface of the measurement window. .

  Accordingly, the scraper moves along the inner surface of the measurement window, and the gas ejection part ejects the purge gas toward the inner surface of the measurement window, so that the measurement window can be properly prevented from being contaminated by the passage of the fine fuel. .

  According to the pulverized fuel production apparatus of the present invention, since the moisture measuring device for measuring the moisture content of the pulverized fuel separated by the separator is provided, the raw material is properly dried and pulverized even if the moisture content of the raw material to be processed fluctuates. And can be transported.

FIG. 1 is a schematic configuration diagram of a coal gasification combined power generation facility to which the pulverized fuel production apparatus according to the first embodiment is applied. FIG. 2 is a schematic diagram showing a moisture measuring device in the pulverized fuel production apparatus. FIG. 3 is a schematic view showing a moisture measuring device in the pulverized fuel production apparatus according to the second embodiment. FIG. 4 is a schematic diagram illustrating a detection unit cleaning device. FIG. 5 is a graph showing the effect of the pulverized fuel production apparatus according to the second embodiment. FIG. 6 is a schematic view showing a moisture measuring device in the pulverized fuel production apparatus according to the third embodiment. FIG. 7 is a side view showing the moisture measuring device.

  Exemplary embodiments of a pulverized fuel production apparatus according to the present invention will be explained below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this embodiment, and when there are two or more embodiments, what comprises combining each embodiment is also included.

[First Embodiment]
FIG. 1 is a schematic configuration diagram of a coal gasification combined power generation facility to which the pulverized fuel production apparatus according to the first embodiment is applied.

  The coal gasification combined power generation facility (IGCC: Integrated Coal Gasification Combined Cycle) of the first embodiment adopts an air combustion method in which coal gas is generated in a gasification furnace using air as an oxidant and is purified by a gas purification device. The coal gas is supplied as fuel gas to the gas turbine equipment for power generation. That is, the coal gasification combined power generation facility of Embodiment 1 is an air combustion type (air blowing) power generation facility. In this case, low-grade coal is used as the wet fuel supplied to the gasifier.

  As shown in FIG. 1, the coal gasification combined power generation facility 10 includes a coal supply device 11, a pulverized coal machine (pulverizer) 12, a bottle system 13, a coal gasification furnace 14, a char recovery device 15, a gas purification device 16, It has a gas turbine facility 17, a steam turbine facility 18, a generator 19, and a heat recovery steam generator (HRSG) 20.

  The coal feeder 11 includes a raw coal bunker 21, a coal feeder 22, and a crusher 23. The raw coal bunker 21 can store low-grade coal (raw material) and can drop a predetermined amount of low-grade coal into the coal feeder 22. The coal feeder 22 can transport the low-grade coal dropped from the raw coal bunker 21 by a conveyor or the like and drop it on the crusher 23. The crusher 23 can crush the dropped low-grade coal into a predetermined size. The coal feeder 22 is provided with a coal supply amount adjusting device (raw material adjusting device) 24 for adjusting the amount of low-grade coal dropped on the crusher 23. The coal supply amount adjusting device 24 can adjust the supply amount of the low-grade coal supplied to the pulverized coal machine 12 via the crusher 23 by adjusting the conveyance speed of the low-grade coal.

  The pulverized coal machine 12 is a coal pulverizer, and pulverizes the low-grade coal supplied from the coal feeder 11 into fine particles to produce pulverized coal (pulverized fuel). The pulverized coal machine 13 can remove moisture contained in the low-grade coal (pulverized coal) by heating and drying the low-grade coal and the pulverized coal with high-temperature air supplied from the outside. Therefore, the pulverized coal machine 13 is connected to the high-temperature air supply adjusting device 31. The high-temperature air supply adjusting device 31 supplies, for example, high-temperature air heated by exchanging heat with the exhaust gas of the exhaust heat recovery boiler 20 to the pulverized coal machine 13, and the temperature is increased by mixing the exhaust gas with the high-temperature air. The temperature can be lowered by mixing external air.

  Therefore, the pulverized coal machine 13 is supplied with raw coal from the coal supply device 11 and is supplied with high temperature air from the high temperature air supply adjustment device 31. Then, the pulverized coal machine 13 is crushed into pulverized coal by the roller while the raw coal is dried by high-temperature air. The pulverized coal is raised and classified by the carrier air (high temperature air), and the pulverized coal having a predetermined particle size or less is discharged to the carrier line 32. The pulverized coal machine 13 is connected to a dust collector (separator) 33 via a transport line 32. The dust collector 33 is, for example, a bag filter or a cyclone, and separates carrier air (hot air) and pulverized coal. The pulverized coal from which the carrier air is separated by the dust collector 33 is stored in the bin 34.

  The bin system 13 includes the bin 34 and two lock hoppers 35a and 35b. The bin 34 stores pulverized coal, and two lock hoppers 35a and 35b are connected in parallel. The lock hoppers 35a and 35b alternately store pulverized coal from the bin 34, and are provided with inlet valves 36a and 36b and outlet valves 37a and 37b.

  The coal gasification furnace 14 can supply pulverized coal treated by the pulverized coal machine 12 and can be recycled by returning the char (unburned coal) recovered by the char recovery device 15. .

  That is, the coal gasification furnace 14 is connected to the compressed air supply line 41 from the gas turbine equipment 17 (compressor 61), and can supply compressed air compressed by the gas turbine equipment 17. The air separation device 42 separates and generates nitrogen and oxygen from air in the atmosphere. A first nitrogen supply line 43 is connected to the coal gasification furnace 14, and the lock hopper 35 a, Charging lines 44a and 44b from 35b are connected. The second nitrogen supply line 45 is also connected to the coal gasification furnace 14, and the char return line 46 from the char recovery device 15 is connected to the second nitrogen supply line 45. Further, the oxygen supply line 47 is connected to the compressed air supply line 41. In this case, nitrogen is used as a carrier gas for coal and char, and oxygen is used as an oxidant.

  The coal gasification furnace 14 is, for example, a spouted bed type gasification furnace, which combusts and gasifies coal, char, air (oxygen) supplied therein or water vapor as a gasifying agent, and produces carbon dioxide. A combustible gas (product gas, coal gas) containing carbon as a main component is generated, and a gasification reaction takes place using this combustible gas as a gasifying agent. The coal gasification furnace 14 is provided with a foreign matter removing device 48 that removes foreign matter mixed with pulverized coal. In this case, the coal gasification furnace 14 is not limited to the spouted bed gasification furnace, and may be a fluidized bed gasification furnace or a fixed bed gasification furnace. The coal gasification furnace 14 is provided with a gas generation line 49 for combustible gas toward the char recovery device 15, and can discharge combustible gas containing char. In this case, by providing a gas cooler in the gas generation line 49, the combustible gas may be cooled to a predetermined temperature and then supplied to the char recovery device 15.

  The char recovery device 15 includes a dust collector 51 and a supply hopper 52. In this case, the dust collector 51 is constituted by one or a plurality of bag filters or cyclones, and can separate char contained in the combustible gas generated in the coal gasification furnace 14. The combustible gas from which the char has been separated is sent to the gas purification device 16 through the gas discharge line 53. The supply hopper 52 stores the char separated from the combustible gas by the dust collector 51. A bin may be disposed between the dust collector 51 and the supply hopper 52, and a plurality of supply hoppers 52 may be connected to the bin. A char return line 46 from the supply hopper 52 is connected to the second nitrogen supply line 45.

The gas purification device 16 performs gas purification by removing impurities such as sulfur compounds and nitrogen compounds from the combustible gas from which the char has been separated by the char recovery device 15. The gas purifier 16 purifies the combustible gas to produce fuel gas and supplies it to the gas turbine equipment 17. In the gas purifier 16, since the combustible gas from which the char is separated still contains sulfur (H ₂ S), the sulfur is finally removed by removing it with the amine absorbent. Is recovered as gypsum and used effectively.

  The gas turbine equipment 17 includes a compressor 61, a combustor 62, and a turbine 63, and the compressor 61 and the turbine 63 are connected by a rotating shaft 64. The combustor 62 has a compressed air supply line 65 connected to the compressor 61, a fuel gas supply line 66 connected to the gas purifier 16, and a combustion gas supply line 67 connected to the turbine 63. Further, the gas turbine equipment 17 is provided with a compressed air supply line 41 extending from the compressor 61 to the coal gasification furnace 14, and a booster 68 is provided in the middle. Therefore, in the combustor 62, the compressed air supplied from the compressor 61 and the fuel gas supplied from the gas purifier 16 are mixed and burned, and the rotating shaft 64 is rotated by the generated combustion gas in the turbine 63. By doing so, the generator 19 can be driven.

  The steam turbine facility 18 includes a turbine 69 that is coupled to the rotating shaft 64 in the gas turbine facility 17, and the generator 19 is coupled to the base end portion of the rotating shaft 64. The exhaust heat recovery boiler 20 is provided in the exhaust gas line 70 from the gas turbine equipment 17 (the turbine 63), and generates steam by exchanging heat between the air and the high temperature exhaust gas. Therefore, the exhaust heat recovery boiler 20 is provided with the steam supply line 71 between the steam turbine equipment 18 and the turbine 69 of the steam turbine equipment 18, the steam recovery line 72 is provided, and the steam recovery line 72 is provided with the condenser 73. Yes. Therefore, in the steam turbine facility 18, the turbine 69 is driven by the steam supplied from the exhaust heat recovery boiler 20, and the generator 19 can be driven by rotating the rotating shaft 64.

  The exhaust gas from which heat has been recovered by the exhaust heat recovery boiler 20 is freed of harmful substances by the gas purification device 74, and the purified exhaust gas is discharged from the chimney 75 to the atmosphere.

  Here, the operation of the coal gasification combined cycle facility 10 of the first embodiment will be described.

  In the coal gasification combined power generation facility 10 of the first embodiment, raw coal (low-grade coal) is stored in the raw coal bunker 21 by the coal feeder 11, and the low-grade coal of the raw coal bunker 21 is coal. It is dropped onto a crusher 23 by a feeder 22 and crushed into a predetermined size. Then, the crushed low-grade coal is put into the pulverized coal machine 12, where it is dried by the high-temperature air from the high-temperature air supply adjusting device 31 and pulverized into fine particles to produce pulverized coal. . The produced pulverized coal is sent to the dust collector 33 by the conveyance line 32, where it is separated into conveyance air (high temperature air) and pulverized coal. The separated pulverized coal is stored in the bin 34 and alternately stored in the lock hoppers 35a and 35b by alternately opening and closing the inlet valves 36a and 36b.

  The pulverized coal stored in the lock hoppers 35a and 35b is supplied to the coal gasifier 14 through the first nitrogen supply line 43 by nitrogen supplied from the air separation device 42 by alternately opening and closing the outlet valves 37a and 37b. Is done. Further, the char recovered by the char recovery device 15 described later is supplied to the coal gasifier 14 through the second nitrogen supply line 45 by nitrogen supplied from the air separation device 42. Further, the compressed air extracted from the gas turbine equipment 17 to be described later is boosted by the booster 68 and then supplied to the coal gasification furnace 14 through the compressed air supply line 41 together with oxygen supplied from the air separation device 42.

  In the coal gasification furnace 14, the supplied pulverized coal and char are combusted by compressed air (oxygen), and the pulverized coal and char are gasified to generate combustible gas (coal gas) mainly composed of carbon dioxide. Can be generated. The combustible gas is discharged from the coal gasifier 14 through the gas generation line 49 and sent to the char recovery device 15.

  In the char recovery device 15, the combustible gas is first supplied to the dust collector 51, whereby the char contained in the gas is separated from the combustible gas. The combustible gas from which the char has been separated is sent to the gas purification device 16 through the gas discharge line 53. On the other hand, the fine char separated from the combustible gas is deposited on the supply hopper 52, returned to the coal gasifier 14 through the char return line 46, and recycled.

  The combustible gas from which the char has been separated by the char recovery device 15 is subjected to gas purification by removing impurities such as sulfur compounds and nitrogen compounds in the gas purification device 16 to produce fuel gas. In the gas turbine facility 17, when the compressor 61 generates compressed air and supplies the compressed air to the combustor 62, the combustor 62 is supplied from the compressed air supplied from the compressor 61 and the gas purification device 16. Combustion gas is generated by mixing with fuel gas and combusting, and the turbine 63 is driven by this combustion gas, so that the generator 19 can be driven via the rotating shaft 64 to generate power.

  The exhaust gas discharged from the turbine 63 in the gas turbine equipment 17 generates steam by exchanging heat with air in the exhaust heat recovery boiler 20, and supplies the generated steam to the steam turbine equipment 18. . In the steam turbine facility 18, the generator 69 can be driven through the rotating shaft 64 to generate electric power by driving the turbine 69 with the steam supplied from the exhaust heat recovery boiler 20.

  Thereafter, in the gas purification device 74, harmful substances in the exhaust gas discharged from the exhaust heat recovery boiler 20 are removed, and the purified exhaust gas is discharged from the chimney 75 to the atmosphere.

  Hereinafter, the pulverized fuel production apparatus according to the first embodiment will be described. FIG. 2 is a schematic diagram showing a moisture measuring device in the pulverized fuel production apparatus.

  The pulverized fuel production apparatus includes a pulverized coal machine 12, a high-temperature air supply adjusting device 31, a transfer line 32, a dust collecting device 33, and a bin system 13, and the pulverized coal separated by the dust collecting device 33. It has a moisture measuring device 101 that measures the amount of moisture. Moreover, the pulverized fuel production apparatus has a temperature measuring device 102 that measures the temperature of the carrier air containing the pulverized coal discharged from the pulverized coal machine 12.

  As shown in FIG. 2, the housing of the dust collector 33 includes a hopper 111 in which the lower part of the hollow body of the apparatus has a funnel shape, and a chute (fine fuel transport path) 112 connected to the lower part of the hopper 111. And a rotary valve (not shown) is provided below the chute 112. The moisture measuring device 101 is provided on the chute 112 of the dust collector 33 and has a measurement window 121, a light emission detection unit 122, and a moisture amount calculation unit 123.

  That is, the chute 112 is arranged along the vertical direction, and the measurement window 121 is fixed to an opening formed in the middle. The measurement window 121 is a circular window and is made of, for example, sapphire glass. Sapphire glass is excellent in heat resistance and wear resistance, and can ensure high smoothness. The light emission detection unit 122 is disposed to face the measurement window 121, can irradiate light into the chute 112 through the measurement window 121, and can receive reflected light reflected by the pulverized coal. The light emission detection unit 122 is connected to a moisture amount calculation unit 123 via an optical fiber 124. The moisture amount calculation unit 123 can calculate the moisture amount of pulverized coal based on the light irradiation amount and the reflection amount by the light emission detection unit 122.

  For example, the moisture measuring device 101 uses moisture absorption in the near-infrared region to measure moisture from the degree of absorption, and previously obtains a correlation (calibration curve) between the degree of infrared absorption and the moisture value. It is necessary to keep. The light emission detection unit 122 irradiates the pulverized coal of the chute 112 with infrared rays through the measurement window 121 and receives the infrared rays reflected by the pulverized coal. In this case, the more moisture there is, the weaker the infrared rays that are reflected back. The moisture amount calculation unit 123 calculates the moisture amount of the pulverized coal based on the deviation between the infrared irradiation amount and the reflection amount by the light emission detection unit 122.

  The moisture measuring device 101 is not limited to this configuration. For example, in addition to the infrared moisture meter described above, a neutron moisture meter, a microwave moisture meter, or the like may be used.

  Further, as shown in FIG. 1, the pulverized fuel production apparatus can adjust the temperature or flow rate of the high-temperature air supplied to the pulverized coal machine 12 by the high-temperature air supply device 31, so that the fine powder measured by the moisture measuring device 101 can be adjusted. The temperature or flow rate of the high-temperature air is adjusted by the high-temperature air adjusting device according to the moisture content of the charcoal. Moreover, since the pulverized fuel manufacturing apparatus can adjust the supply amount of the low-grade coal supplied to the pulverized coal machine 12 by the coal supply amount adjusting device 24, the pulverized fuel production apparatus according to the moisture content of the pulverized coal measured by the moisture measuring device 101. Then, the supply amount of the low-grade coal is adjusted by the coal supply amount adjusting device 24.

  Specifically, the moisture measuring device 101 is connected to the control device 103, and the measured moisture content of the pulverized coal is input. In addition, the control device 103 is connected to the high-temperature air supply device 31 and the coal supply amount adjustment device 24, and the temperature or flow rate of the high-temperature air supplied to the pulverized coal machine 12 and the low-grade coal supplied to the pulverized coal machine 12. The supply amount can be adjusted. Furthermore, the temperature measuring apparatus 102 is connected to the control apparatus 103, and the measured temperature of pulverized coal is input.

  Therefore, when the pulverized coal from the hopper 111 passes through the chute 112 in the dust collector 33, the moisture measuring device 101 measures the moisture content (moisture content) of the pulverized coal and outputs it to the control device 103. Further, the temperature measuring device 104 measures the temperature of the conveying air containing the pulverized coal discharged from the pulverized coal machine 12 to the conveying line 32 and outputs it to the control device 103. At this time, the control device 103 controls the high-temperature air supply device 31 and the coal supply amount adjusting device 24 based on the moisture content of the pulverized coal in the dust collector 33 and the temperature of the carrier air discharged from the pulverized coal machine 12. .

  For example, when the moisture content of the pulverized coal is greater than a preset optimum value, the control device 103 increases the temperature of the high-temperature air supplied to the pulverized coal machine 12 by the high-temperature air supply device 31 or increases the flow rate. Let Moreover, the control apparatus 103 reduces the supply amount of the low grade coal supplied to the pulverized coal machine 12 by the coal supply amount adjusting device 24 when the moisture content of the pulverized coal is larger than the preset optimum value. In this case, when the moisture content of the pulverized coal is greater than the optimum value, the control device 103 increases the temperature of the high-temperature air supplied to the pulverized coal machine 12 or increases the flow rate, and after a predetermined time has elapsed, When the water content of the pulverized coal is larger than the optimum value, the supply amount of the low-grade coal supplied to the pulverized coal machine 12 is decreased.

  Moreover, when the conveyance air temperature containing pulverized coal is lower than the optimum value set in advance, the control device 103 increases the temperature of the high-temperature air supplied to the pulverized coal machine 12 by the high-temperature air supply device 31 or the flow rate. Increase.

  As a result, the moisture content of the pulverized coal supplied to the coal gasification furnace 14 becomes an appropriate value, and high-quality combustible gas can be efficiently generated using the pulverized coal.

  Thus, in the pulverized fuel production apparatus of the first embodiment, the pulverized coal machine 12 that crushes raw coal to form pulverized coal, and the high-temperature air supply adjustment device 31 that supplies high-temperature air to the pulverized coal machine 12. And a pulverized coal discharged from the pulverized coal machine 12 and a conveying line 32 that conveys high-temperature air, a dust collector 33 that separates the pulverized coal conveyed by the conveying line 32 and high-temperature air, and a dust collecting device 33 A bin system 13 for storing the pulverized coal and a moisture measuring device 101 for measuring the moisture content of the pulverized coal separated by the dust collector 33 are provided.

  Therefore, when the high-temperature air supply adjusting device 31 supplies high-temperature air to the pulverized coal machine 12, the pulverized coal machine 12 dries low-grade coal with high-temperature air and crushes to form pulverized coal. Is transported to the dust collector 33 through the transport line 32, the dust collector 33 separates the pulverized coal from the high-temperature air, and the separated pulverized coal is stored in the bin system 13. At this time, the moisture measuring device 101 can determine the dry state of the pulverized coal by measuring the moisture content of the pulverized coal separated by the dust collecting device 33, and the temperature, supply amount, and low quality of the high-temperature air. By adjusting the supply amount of charcoal, the pulverized coal can be maintained in an optimal dry state. As a result, even if the moisture content of the low-grade coal to be treated fluctuates, the low-grade coal can be properly dried and pulverized and conveyed.

  In the pulverized fuel production apparatus according to the first embodiment, a control device 103 that controls the high-temperature air supply adjusting device 31 according to the amount of water measured by the moisture measuring device 101 is provided. Therefore, for example, when the water content of the pulverized coal has a deviation from the preset optimum water content, the temperature or flow rate of the high-temperature air supplied to the pulverized coal machine 12 by the high-temperature air supply adjusting device 31 is adjusted. The pulverized coal can always be dried to the optimum moisture content.

  In the pulverized fuel production apparatus according to the first embodiment, a coal supply amount adjusting device 24 that adjusts the supply amount of low-grade coal supplied to the pulverized coal machine 12 is provided, and the control device 103 is configured to measure the amount of water measured by the moisture measuring device 101. Accordingly, the coal supply amount adjusting device 24 is controlled. Therefore, for example, when the water content of the pulverized coal has a deviation from the preset optimum water content, the supply amount of the low-grade coal supplied to the pulverized coal machine 12 by the coal supply amount adjusting device 24 is adjusted. The pulverized coal can always be dried to the optimum moisture content.

  In the pulverized fuel production apparatus according to the first embodiment, as the moisture measuring device 101, a measurement window 121 provided on the chute 112 of the dust collector 33, and a light emission detection unit 122 that irradiates light through the measurement window 121 and receives reflected light. And a moisture amount calculation unit 123 that calculates the moisture amount of the pulverized coal based on the light irradiation amount and the reflection amount. The moisture content of pulverized coal can be easily determined online.

  In the pulverized fuel production apparatus of the first embodiment, the measurement window 121 is provided in the housing of the dust collector 33, that is, the chute 112. Therefore, the moisture content of pulverized coal can be easily obtained.

[Second Embodiment]
FIG. 3 is a schematic diagram showing a moisture measuring device in the pulverized fuel production apparatus of the second embodiment, FIG. 4 is a schematic diagram showing a detection unit cleaning apparatus, and FIG. 5 is an effect in the pulverized fuel production apparatus of the second embodiment. It is a graph showing. In addition, the same code | symbol is attached | subjected to the member which has the same function as embodiment mentioned above, and detailed description is abbreviate | omitted.

  In the second embodiment, as shown in FIGS. 3 and 4, the housing of the dust collector 33 includes a hopper 111 and a chute 112, and the moisture measuring device 101 is provided on the chute 112. The moisture measuring device 101 includes a measurement window 121, a light emission detection unit 122, and a moisture amount calculation unit 123.

  That is, the chute 112 is disposed along the vertical direction, and a recess 113 protruding outward is formed in the middle portion, and the measurement window 121 is fixed to the opening formed in the recess 113. The recess 113 has a circular shape, and the measurement window 121 is a circular window having a smaller diameter than the recess 113. The light emission detection unit 122 can irradiate light into the chute 112 through the measurement window 121 and can receive reflected light reflected by the pulverized coal. The light emission detection unit 122 is connected to a moisture amount calculation unit 123 via an optical fiber 124, and can calculate the moisture amount of pulverized coal based on the light irradiation amount and the reflection amount.

  Further, the chute 112 is provided with a cleaning device 131 for cleaning the measurement window 121 in the recess 113. The cleaning device 131 ejects an inert gas (for example, nitrogen) as a purge gas toward the scraper 132 that moves along the inner surface of the measurement window 121 on the chute 112 side and the inner surface of the measurement window 112 on the chute 112 side. It has two gas ejection parts 133. The scraper 132 can remove foreign matters such as pulverized coal adhering to the inner surface of the measurement window 121 by moving in the vertical direction with respect to the measurement window 121 by the hydraulic cylinder 134. The two gas ejection parts 133 are fixed to the scraper 132 and connected to a pipe 135 from an inert gas supply part (not shown). By injecting an inert gas toward the measurement window 121, the measurement window 121 Foreign substances such as pulverized coal adhering to the inner surface of 121 can be removed.

  Therefore, in the dust collector 33, when the pulverized coal passes from the hopper 111 to the chute 112, the cleaning device 131 moves the scraper 132 in the vertical direction with respect to the measurement window 121 by the hydraulic cylinder 134, and the gas ejection portion. By ejecting inert gas toward the measurement window 121 by 133, foreign matters such as pulverized coal adhering to the inner surface of the measurement window 121 can be removed. In this case, the cleaning device 131 operates constantly or intermittently to clean the inner surface of the measurement window 121.

  Then, when the moisture measuring device 101 measures the moisture content of the pulverized coal passing through the chute 112, the cleaning device 131 stops the operation of the scraper 132 by the hydraulic cylinder 134 and ejects the inert gas by the gas ejection unit 133. To stop. In this state, the moisture measuring device 101 measures the moisture content of the pulverized coal that passes through the chute 112. As a result, the moisture measuring device 101 can measure the moisture content of the pulverized coal with high accuracy through the measurement window 121 to which no foreign matter is attached.

  That is, as shown in FIG. 5, when the cleaning device 131 for the measurement window 121 is not attached, the measured moisture amount in the pulverized coal varies as represented by white circles ○, but the measurement window 121 is cleaned. When the apparatus 131 is mounted, the variation in the amount of moisture in the measured pulverized coal is reduced as represented by the black circles ●.

  Thus, in the pulverized fuel production apparatus of the second embodiment, the moisture measuring device 101 that measures the moisture content of the pulverized coal separated by the dust collector 33 is provided, and is provided on the chute 112 of the dust collector 33. A cleaning device 131 for cleaning the measurement window 121 is provided.

  Therefore, by cleaning the measurement window 121 with the cleaning device 131, contamination of the measurement window 121 due to the passage of pulverized coal is prevented, and moisture measurement can be performed with high accuracy.

  In the pulverized fuel production apparatus according to the second embodiment, the cleaning device 131 includes a scraper 132 that moves along the inner surface of the measurement window 121 and a gas ejection portion 133 that ejects an inert gas toward the inner surface of the measurement window 121. Provided. Accordingly, the scraper 132 moves along the inner surface of the measurement window 121 and the gas ejection part 133 ejects an inert gas toward the inner surface of the measurement window 121, so that the measurement window 121 is not contaminated by the passage of pulverized coal. It can be prevented properly.

[Third Embodiment]
FIG. 6 is a schematic view showing a moisture measuring device in the pulverized fuel production apparatus according to the third embodiment, and FIG. 7 is a side view showing the moisture measuring device. In addition, the same code | symbol is attached | subjected to the member which has the same function as embodiment mentioned above, and detailed description is abbreviate | omitted.

  In the third embodiment, as shown in FIGS. 6 and 7, the housing of the dust collector 33 includes a hopper 111 and a chute 112, and a moisture measuring device 141 is provided in the hopper 111. That is, the hopper 111 is provided with a prism 151 as a passage penetrating in the horizontal direction. The prism 151 has a triangular cross-sectional shape, and includes two inclined surfaces 152 and one horizontal plane 153. ing. The moisture measuring device 141 includes a measurement window 121, a light emission detection unit 122, and a water content calculation unit 123, and the measurement window 121 and the light emission detection unit 122 are disposed in the prism 151.

  That is, the measurement window 121 is a circular window, and is fixed to an opening formed on one inclined surface 152. The light emission detection unit 122 is disposed so as to face the measurement window 121, can irradiate light into the hopper 111 through the measurement window 121, and can receive reflected light reflected by the pulverized coal. The light emission detection unit 122 is connected to a moisture amount calculation unit 123 disposed outside the prism 151 via an optical fiber 124. The moisture amount calculation unit 123 can calculate the moisture amount of pulverized coal based on the light irradiation amount and the reflection amount by the light emission detection unit 122.

  Therefore, when the pulverized coal passes through the hopper 111 in the dust collector 33, the moisture measuring device 141 can measure the moisture content of the pulverized coal.

  As described above, in the pulverized fuel production apparatus according to the third embodiment, the prism 151 is provided by penetrating the hopper 111 in the horizontal direction, and the measurement window 121 and the light emission detection unit constituting the moisture measuring apparatus 141 are provided in the prism 151. 122 is arranged. Therefore, the moisture content of pulverized coal can be obtained with high accuracy.

  In the second embodiment described above, the cleaning device 131 is configured by the scraper 132 and the gas ejection unit 133, but may be either the scraper 132 or the gas ejection unit 133. Moreover, you may apply this cleaning apparatus 131 to the moisture measuring device 141 of 2nd Embodiment. Further, the cleaning device is not limited to the scraper 132 and the gas ejection part 133, and may be a wiper, for example.

11 Coal feeder 12 Pulverized coal machine (pulverizer)
13 Bin system (reservoir)
14 Coal gasifier 15 Char recovery device 16 Gas purification device 17 Gas turbine facility 18 Steam turbine facility 19 Generator 20 Waste heat recovery boiler 24 Coal supply amount adjustment device (raw material adjustment device)
31 High temperature air supply adjustment device (high temperature air supply device, high temperature air adjustment device)
32 Conveying Line 33 Dust Collector 101, 141 Moisture Measuring Device 102 Temperature Measuring Device 103 Control Device 111 Hopper (Fine Powder Transportation Route, Housing)
112 Chute (fine fuel transfer path, housing)
121 Measurement Window 122 Light Emission Detection Unit 123 Moisture Content Calculation Unit 124 Optical Fiber 131 Cleaning Device 132 Scraper 133 Gas Ejection Unit 151 Prism (Passage)

Claims (7)

A crusher that crushes raw materials to form pulverized fuel;
A high-temperature air supply device for supplying high-temperature air to the crusher;
A transport line for transporting pulverized fuel and hot air discharged from the crusher;
A separation device for separating the pulverized fuel and high-temperature air conveyed in the conveyance line;
A reservoir for storing the pulverized fuel separated by the separator;
A moisture measuring device for measuring the moisture content of the pulverized fuel separated by the separating device;
An apparatus for producing pulverized fuel, comprising:   A high-temperature air adjustment device that adjusts the temperature or flow rate of the high-temperature air supplied to the crusher by the high-temperature air supply device, and a control device that controls the high-temperature air adjustment device according to the amount of moisture measured by the moisture measurement device; The pulverized fuel production apparatus according to claim 1, wherein:   The raw material adjustment apparatus which adjusts the quantity of the raw material supplied to the said crusher, and the control apparatus which controls the said raw material adjustment apparatus according to the moisture content which the said moisture measuring device measured are provided. Or the pulverized fuel manufacturing apparatus of Claim 2.   The moisture measuring device is based on a measurement window provided in a pulverized fuel conveyance path in the separation device, a light emission detection unit that irradiates light through the measurement window and receives reflected light, and a light irradiation amount and a reflection amount. The pulverized fuel production apparatus according to any one of claims 1 to 3, further comprising a moisture amount calculation unit configured to calculate a moisture amount of the pulverized fuel.   The pulverized fuel production apparatus according to claim 4, wherein the measurement window is provided in a housing of the separation device or a passage disposed in the housing.   The pulverized fuel production apparatus according to claim 4 or 5, wherein a cleaning device for cleaning the measurement window is provided.   The pulverized fuel production according to claim 6, wherein the cleaning device includes a scraper that moves along an inner surface of the measurement window, and a gas ejection portion that ejects a purge gas toward the inner surface of the measurement window. apparatus.

Images