CN106907931A - Process and system that sintering deposit waste heat drags main exhauster are reclaimed with perpendicular cold kiln - Google Patents

Abstract

The present invention relates to a process and system for recovering waste heat of sintered ore from a vertical cooling kiln to drive the main exhaust fan. The hot sintered ore exchanges heat with cold air in the vertical cooling kiln, and the waste gas is sent to the waste heat boiler after dedusting to generate superheated steam. Send it to the steam turbine; the steam turbine directly drives the sintering main exhaust fan to run through the variable speed clutch and synchronous motor. The invention adopts a vertical cooling kiln with a new structure, which can maximize the waste heat recovery rate of sintered ore; realize the complementarity of steam turbine power generation and grid electric energy through a synchronous motor, and ensure the normal operation of the sintering main exhaust fan; the vertical cooling kiln, waste heat boiler, The steam turbine and the sintering main exhaust fan constitute a complete energy utilization process system of the sintering plant. The steam turbine directly provides power to the main exhaust fan, reducing power consumption from the grid, and avoiding the integration of the steam turbine power generation into the grid and the sintering main exhaust fan from the grid in the conventional technology. The secondary efficiency loss caused by the conversion of mechanical energy into electrical energy and the conversion of electrical energy into mechanical energy is of great significance to energy saving and benefit creation.

Description

Process method and system for driving main exhaust fan by recovering sinter waste heat from vertical cooling kiln

technical field

The invention relates to the technical field of sinter waste heat recovery and utilization, in particular to a process method and system for driving a main exhaust fan by recovering sinter waste heat from a vertical cooling kiln.

Background technique

The main exhaust fan is the largest energy-consuming equipment in the sintering plant, and its power consumption is about 30% of the total power consumption of the equipment in the plant; taking a 265m ² sintering machine (95% operating rate) as an example, the power of the supporting main exhaust fan It is 8000kW, and the annual power consumption is about 56630MWh. Calculated at 0.547 yuan/kWh, the annual electricity fee is 30.98 million yuan.

The temperature of the sintered ore is about 700-750°C. The blast furnace is supplied with cold ore. Due to the structural characteristics of the equipment, the annular cooler and the belt cooler can only recover about 30% of the heat of the exhaust gas; the vertical cooling kiln (vertical cooling kiln) equipment can Improve the heat recovery rate, so many research institutes and enterprises currently use vertical cooling kilns to recover sinter waste heat. Such as "Sinter Furnace Cooling Device" with patent No. 201310127744.5, "Vertical Sinter Cooler" with patent No. 93117175.X, "Vertical Cooling and Waste Heat Recovery Furnace for Sinter" with patent No. 201310672967.X And so on, and a set of vertical cold kiln equipment has been put into operation in Tianjin Tianfeng Iron and Steel, and the recovery rate of waste heat has been greatly improved.

The use of steam boilers to recover high-temperature exhaust gas is a common practice at present. Incorporating steam into the heat pipe network and using steam to drive steam turbines to generate electricity and merge them into the power grid are also currently more commonly used energy conversion methods. For example, "Sinter Sensible Heat Recovery Device" with patent No. 201520756682.9, "A System for Sinter Cooling and Sensible Heat Efficient Recovery and Utilization" with patent No. 201610150596.2, and "A Sintering System with Sieve" with Patent No. 201310127764.2. The high-efficiency recovery of mine waste heat and power generation technology and equipment" all adopt the method of vertical cold kiln + waste heat boiler + steam turbine. The end point of the above process route is that the steam turbine generates power and is connected to the grid, while the sintering main exhaust fan needs to take power from the grid. During the two energy conversion processes, the mechanical energy is converted into electrical energy when the steam turbine generates power and the electrical energy is converted into mechanical energy when the sintering main exhaust fan takes power. , there must be energy loss, and due to the huge power consumption, the energy waste and corresponding capital waste caused by the energy loss are also amazing.

The airtightness of the vertical cooling kiln determines the waste gas recovery rate, and the air leakage point is mainly the feeding and discharging system. The feeding methods of vertical cold kiln currently used in China are: inclined bridge + umbrella-shaped material distribution form (patent number 201511002240.6, "multi-angle, multi-layer, 360-degree air supply sinter cooling tower"); chain plate conveyor + rotary material distribution form (patent number No. 201320185479.1, "A Sinter Furnace Cooling and Heat Exchange Device"; Patent No. 201520756682.9, "Sinter Sensible Heat Recovery Device"); directly connected to the discharge end of the sintering machine + bell/umbrella cloth form (Patent No. 201310127744.5 , "Sinter Furnace Cooling Device"; Patent No. 93117175.X, "Vertical Sinter Cooler"; Patent No. 201310672967.X, "Vertical Cooling and Waste Heat Recovery Furnace for Sinter"); Among them, the inclined bridge feeding For discontinuous operation, a single bucket is tilted, but the sealing of the upper part of the kiln roof is not as good as the continuous operation of the chain plate and the rolling discharge effect of the head. The feeding method directly connected to the discharge end of the sintering machine has great limitations on the height arrangement of the sintering machine and shaft kiln in the previous process.

At present, the unloading methods commonly used in vertical cooling kilns are: star unloading machine (Patent No. 201220491407.5, "A High-Efficiency Heat Recovery Type Sinter Cooling System"; Patent No. 201610150596.2, "A sinter cooling and sensible heat Efficient Recycling System"; Patent No. 200910074513.6, "A Vertical Sinter Cooler That Can Efficiently Recycle Sensible Heat of Sinter"); Electric Vibration Feeder (Patent No. 93117175.X, "Vertical Sinter Cooler" ); electric vibration quantitative discharger + rotary discharge valve (Patent No. 201320185290.2, "Unloading Device for Sinter Cooling Furnace"), (Patent No. 201520756682.9 "Sinter Sensible Heat Recovery Device"). Since the sintered ore entering the vertical cold kiln has requirements on the particle size, it should not be too small. Although the star type/rotary unloading equipment has good sealing performance, due to material extrusion, the granular material may be stuck in the equipment gap, affecting normal operation. In comparison, there is no broken material in the electric vibration feeder, but the appropriate height of the sealing material column should be considered.

The heat recovery rate of the vertical cooling kiln is related to the solid-gas heat exchange, and the way of distributing materials and air is the key. The vertical cooling kiln material distribution methods currently used in China include: rotary material distribution (Patent No. 201520756682.9, "Sinter Sensible Heat Recovery Device"; Patent No. 201310127797.7, "Sinter Cooling Furnace Rotary Feeding Device"); vertical screw feeder, Bell-type cloth (Patent No. 201320185480.4, "A Suspended Distributor for Sinter Cooling Furnace"; Patent No. 93117175.X, "Vertical Sinter Cooler"; Patent No. 201511002240.6, "Multi-angle, Multi-layer, 360-degree Air Supply Sintering Mine Cooling Tower"; Patent No. 201320814396.4, "Vertical Cooling and Waste Heat Recovery Furnace Feeding Device for Sintering Mine"), etc. The air distribution methods adopted include: setting up multiple air chambers for peripheral air supply (Patent No. 201310128026.X, "A Sinter Cooling Furnace"); central air supply (Patent No. 201320814379.0, "Sinter Vertical Cooling and Waste Heat Recovery Furnace cold air supply device"), the center (multi-layer umbrella) and the surrounding (air ring) are combined with air supply (patent No. 201520756682.9, "Sinter Sensible Heat Recovery Device"); louver ventilation style (patent No. 201511002240.6, Multi-faceted multi-layer 360-degree air supply sinter cooling tower"); multiple fans are arranged in a circle (Patent No. 200910074513.6, "A Vertical Sinter Cooler That Can Efficiently Recover Sensible Heat of Sinter"), (Patent No. 93117175.X , "Vertical Sinter Cooler"), etc. The existing material distributing equipment makes the edge distribution of large particles, and improves the distribution by changing the material accumulation angle, but cannot achieve uniform distribution of materials on the cross-section of the kiln. The air supply method adopts the combination of the periphery and the center, which is suitable for shaft kilns with large cross-sections, and can ensure that the cold air and materials are evenly and fully contacted.

To sum up, the existing vertical cold kilns generally have problems such as poor sealing and uneven distribution of materials, resulting in poor site environment, high discharge temperature, and low temperature of recycled exhaust gas, which directly affects the operation of the discharge conveying equipment and the heat recovery rate And calorific value, its consequence is that the economic benefits created are not good, and the equipment maintenance cost is high.

Contents of the invention

The invention provides a process method and system for driving the main exhaust fan by recovering waste heat of sintered ore in a vertical cooling kiln. The use of a new type of vertical cooling kiln to cool the sintered ore can maximize the recovery rate of waste heat of the sintered ore and improve the production environment; The exhaust gas generated by the vertical cooling kiln is sent to the steam turbine through the waste heat boiler. The mechanical energy generated by the steam turbine directly drives the sintering main exhaust fan to run, and the synchronous motor realizes the complementarity between the power generation of the steam turbine and the electric energy of the grid to ensure the normal operation of the sintering main exhaust fan; The complete sintering plant energy utilization process system consisting of vertical cooling kiln, waste heat boiler, steam turbine and sintering main exhaust fan, the steam turbine directly provides power to the main exhaust fan, reducing power consumption from the grid, and avoiding the integration of steam turbine power generation in conventional technology The secondary efficiency loss caused by the conversion of mechanical energy into electrical energy when the power grid and sintering main exhaust fan draws power from the grid, and then conversion of electrical energy into mechanical energy, is of great significance to energy conservation and benefit creation.

In order to achieve the above object, the present invention adopts the following technical solutions to realize:

The technical method of using the vertical cooling kiln to recover the sinter waste heat to drive the main exhaust fan includes the following steps:

1) The hot sintered ore above 700°C produced by the sintering machine is crushed by the single roll crusher and falls into the chute, and is fed to the chain bucket conveyor by the electric vibrating feeder, and then lifted into the vertical cooling kiln; the vertical cooling kiln The upper part is equipped with a rotary distributor and a distributor. The distributor is composed of a plurality of discharge chutes uniformly distributed along the circumference of the vertical cooling kiln; the sintered ore is discharged from the head of the chain bucket conveyor, and enters the rotary distributor through the receiving chute, and the rotary distribution The distributor distributes material along the circumference of the distributor, and the discharge chute is used for buffering the discharge and evenly distributes the hot sinter on the cross section of the vertical cooling kiln; the cold air in the vertical cooling kiln is provided by a blower, and the cold air is in the center of the lower part of the vertical cooling kiln The air outlet of the air duct and the air outlet of the circular air duct ensure the uniform distribution of cold air in the vertical cooling kiln;

2) In the vertical cooling kiln, the sintered ore and the cold air are subjected to countercurrent heat exchange, and the sintered ore with a temperature <135°C after cooling is discharged to the belt conveyor by multiple discharge chutes uniformly distributed at the bottom of the kiln and an electric vibrating feeder. The waste gas above 586℃ in the kiln is discharged from the kiln roof into the gravity dust collector for one-time dust removal, and the waste gas after dust removal is introduced into the waste heat boiler through the pipeline;

3) In the waste heat boiler, the exhaust gas exchanges heat with water, and the superheated steam generated is sent to the steam turbine; the low-temperature exhaust gas after heat exchange enters the bag filter for secondary dust removal, and the settled dust is collected together with the gravity dust collector and the waste heat boiler. The dust is transported together by the chain conveyor; the exhaust gas is sent to the chimney by the induced draft fan after the dust removal and purification reach the standard;

4) The steam turbine converts the thermal energy of the superheated steam into mechanical energy, drives the variable speed clutch to rotate and drives the synchronous motor to run, and the synchronous motor drives the blades of the sintering main exhaust fan to rotate to realize the operation of the sintering main exhaust fan; when the capacity of the steam turbine is sufficient, the remaining electric energy of the synchronous motor Connected to the grid for use; when the capacity of the steam turbine is insufficient, the synchronous motor takes power from the grid for the sintering main exhaust fan, and ensures the normal operation of the sintering main exhaust fan;

5) The cooling steam after dragging the steam turbine enters the waste heat boiler to realize recycling; firstly, it is condensed by the condenser, and the condensed water is pumped from the condensed water to the desalinated water tank, and then sent to the heater and deaerator in sequence through the low-pressure feed water pump for heating, After deoxygenation, it is sent to the feed water steam drum, and then after passing through the evaporator and superheater, superheated steam is generated and sent to the steam turbine.

The driving devices of the rotary distributor, blower, electric vibrating feeder 1, and electric vibrating feeder 2 are all controlled by frequency conversion to ensure the stability of the material surface in the vertical cooling kiln and the adequacy and uniformity of cooling of the hot sintered ore .

A process system for driving the main exhaust fan by recovering sinter waste heat from a vertical cooling kiln for realizing the process method, including a vertical cooling kiln, a gravity dust collector, a waste heat boiler, a steam turbine, a variable speed clutch, and a synchronous motor sequentially connected according to the process route and the sintering main exhaust fan; a material receiving chute is set above the hot sinter feed inlet on the top of the vertical cooling kiln, and the single roll crusher after the sintering machine is connected to receive material through the chute, the electric vibration feeder and the chain bucket conveyor Chute; the bottom of the material receiving chute is connected to the distributor through a rotary distributor. The rotary distributor is composed of a distributor body, a rotary distributor chute and a driving motor. And it is connected with the driving motor for transmission. The bottom is located in the middle above the distributor. Driven by the driving motor, the rotating distributing chute rotates around the central axis of the vertical cooling kiln; The discharge chute is a tapered structure that expands downwards, and its discharge end is set in the upper space of the vertical cooling kiln; the lower part of the vertical cooling kiln is equipped with a central air duct outlet and an annular air duct outlet, and the annular air duct outlet is along the vertical The outer edge of the cold kiln is provided with several, the central air duct and the annular air duct are respectively connected to the blower through the air duct; the bottom of the vertical cold kiln is equipped with a plurality of discharge chutes uniformly distributed along the circumferential direction, and the bottom of the discharge chute is connected to the belt conveyor ; The top exhaust gas outlet of the vertical cold kiln is connected to the gravity dust collector, the high temperature exhaust gas pipeline behind the gravity dust collector is connected to the evaporator in the waste heat boiler, and the low temperature exhaust gas pipeline is connected to the chimney through the bag filter and induced draft fan.

The dust outlets of the gravity dust collector, the bag filter and the waste heat boiler are respectively connected to the chain conveyor.

The waste heat boiler is equipped with an evaporator, a superheater, a condenser, a heater and a deaerator, and the evaporator is connected to the superheated steam inlet of the steam turbine through the superheater; the cooling steam outlet of the steam turbine is connected to the condenser, and the condenser passes through the condensation The water pump is connected to the desalinated water tank, and the desalted water tank is connected to the heater and deaerator through the feed water pump, and the superheated steam pipeline after the deaerator is connected to the evaporator through the feed water drum.

The body of the chute, receiving chute, rotating distribution chute, distributor, and discharging chute is made of boiler steel plate or heat-resistant stainless steel, with or without lining as required, and the inner lining is made of high wear-resistant manganese alloy steel plate or fire-resistant material.

The vertical cold kiln is provided with a lining layer on the inner wall above the air outlet of the circular air duct, the lining layer is composed of an inner working layer and an outer insulating layer, the inner working layer is made of refractory bricks, and the outer insulating layer is formed by refractory spray paint , the lining is supported by the supporting brick ring.

The chain bucket conveyor is provided with a sealed heat preservation cover.

The driving motor includes two motors symmetrically arranged on the top edge of the distributor body, and a ring gear is arranged on the top edge of the distributor body, and the ring gear rotates under the drive of the motor, and is engaged with the gear arranged on the top of the rotating distribution tank to drive the rotation. The distribution chute moves along the top edge of the distributor body and realizes the rotation of the rotating distribution chute around the central axis of the vertical cooling kiln.

The number of the discharge chute and the discharge chute is 6.

Compared with prior art, the beneficial effect of the present invention is:

1) A new type of vertical cooling kiln is used to cool the sintered ore, which can realize the uniform distribution of material particles in the kiln, and the stability of the material surface in the kiln is good, the hot ore is cooled sufficiently and evenly, and the waste heat recovery rate of the sintered ore is maximized. And the overall sealing is good, which can improve the production environment;

2) The waste gas generated by the vertical cooling kiln is sent to the steam turbine through the waste heat boiler, and the mechanical energy generated by the steam turbine directly drives the sintering main exhaust fan to run, and the synchronous motor is used to realize the complementarity between the power generation of the steam turbine and the electric energy of the grid to ensure the normal operation of the sintering main exhaust fan; Its principle is unique, the structure is novel, the concept is ingenious, and the operation mode is flexible;

3) A complete sintering plant energy utilization process system consisting of a vertical cold kiln, waste heat boiler, steam turbine and sintering main exhaust fan. The steam turbine directly supplies power to the main exhaust fan, reducing power consumption from the grid and avoiding the need for steam turbines in conventional technologies. The secondary efficiency loss caused by the integration of power generation into the power grid and the sintering main exhaust fan taking power from the power grid is of great significance to energy saving and benefit creation.

Description of drawings

Fig. 1 is the flow chart of the process of using the recovery of sinter waste heat from the vertical cooling kiln to drive the main exhaust fan according to the present invention.

Fig. 2 is a schematic diagram of the facade structure of the vertical cooling kiln of the present invention.

FIG. 3 is a partially enlarged view of FIG. 2 .

Figure 4 is a top view of the dispenser.

In the figure: 1. Sintering machine 2. Single roll crusher 3. Chute 4. Electric vibration feeder 5. Chain bucket conveyor 6. Receiving chute 7. Rotary distributor 71. Distributing trough body 72. Rotating distributing trough 73. Drive motor 8. Distributor 81. Cylinder body 82. Blanking chute 9. Vertical cooling kiln 91. Air outlet of central air duct 92. Air outlet of annular air duct 93. Refractory brick 10. Discharge chute 11. Electric vibration feed Material machine 2 12. Belt conveyor 13. Gravity dust collector 14. Waste heat boiler 15. Chain plate conveyor 16. Chimney

detailed description

The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

As shown in Fig. 1, the technical method of dragging the main exhaust fan with vertical cooling kiln recovery sinter waste heat described in the present invention, comprises the following steps:

1) The hot sintered ore above 700°C produced by sintering machine 1 is crushed by single roll crusher 2 and then falls into chute 3, fed to chain bucket conveyor 5 by electric vibrating feeder 1, and then lifted into vertical cooling kiln 9; The upper part of the vertical cooling kiln 9 is provided with a rotary distributor 7 and a distributor 8, and the distributor 8 is composed of a plurality of discharge chutes 82 uniformly distributed along the circumference of the vertical cooling kiln 9; the sintered ore is discharged from the head of the chain bucket conveyor 5 The material enters the rotary distributor 7 through the receiving chute 6, and the rotary distributor 7 distributes the material along the circumference of the distributor 8. The discharge chute 82 is used for buffering the discharge and uniformly distributes the hot sintered ore on the cross section of the vertical cold kiln 9; The cold air in the cold kiln 9 is provided by a blower, and the cold air is discharged from the central air duct air outlet 91 and the annular air duct air outlet 92 located at the bottom of the vertical cold kiln 9 to ensure the uniformity of distribution of the cold air in the vertical cold kiln 9;

2) In the vertical cooling kiln 9, the sintered ore and the cold air are subjected to countercurrent heat exchange, and the sintered ore with a temperature <135°C after cooling is discharged to the The belt conveyor 12 is used for transportation; the waste gas above 586°C in the kiln is discharged from the kiln roof into the gravity dust collector 13 for one-time dust removal, and the waste gas after dust removal is introduced into the waste heat boiler 14 through the pipeline;

3) In the waste heat boiler 14, the exhaust gas exchanges heat with water, and the superheated steam generated is sent to the steam turbine; the low-temperature exhaust gas after heat exchange enters the bag filter for secondary dust removal, and the settled dust is combined with the gravity dust collector 13 and the waste heat boiler 14 The collected dust is transported together by the chain conveyor 15; the exhaust gas is sent to the chimney 16 by the induced draft fan after being dedusted and purified up to the standard;

4) The steam turbine converts the thermal energy of the superheated steam into mechanical energy, drives the variable speed clutch to rotate and drives the synchronous motor to run, and the synchronous motor drives the blades of the sintering main exhaust fan to rotate to realize the operation of the sintering main exhaust fan; when the capacity of the steam turbine is sufficient, the remaining electric energy of the synchronous motor Connected to the grid for use; when the capacity of the steam turbine is insufficient, the synchronous motor takes power from the grid for the sintering main exhaust fan, and ensures the normal operation of the sintering main exhaust fan;

5) The cooling steam after driving the steam turbine enters the waste heat boiler 14 to realize recycling; firstly, it is condensed by the condenser, and the condensed water is pumped to the desalinated water tank by the condensed water pump, and then sent to the heater and the deaerator in turn for heating by the low-pressure feed water pump , After deoxygenation, it is sent to the steam feed drum, and then the superheated steam is generated after passing through the evaporator and superheater and sent to the steam turbine.

The driving devices of the rotary distributor 7, blower, electric vibrating feeder 1 4, and electric vibrating feeder 2 11 are all controlled by frequency conversion to ensure the stability of the material surface in the vertical cold kiln 9 and the sufficient cooling of the hot sintered ore. sex and uniformity.

As shown in Fig. 1 and Fig. 2, the process system for realizing the process method is to use the waste heat of sinter recovered by the vertical cold kiln to drive the main exhaust fan, including the vertical cold kiln 9 and the gravity dust collector 13 connected in sequence according to the process route , waste heat boiler 14, steam turbine, variable speed clutch, synchronous motor and sintering main exhaust fan; a material receiving chute 6 is arranged above the hot sinter feed inlet at the top of the vertical cold kiln 9, and the single roll crusher 2 behind the sintering machine 1 passes through The chute 3, the electric vibration feeder 4 and the chain bucket conveyor 5 are connected to the material receiving chute 6; as shown in Figure 3, the bottom of the material receiving chute 6 is connected to the distributor 8 through the rotating distributor 7, and the rotating distributor 7 is formed by the material Composed of a distributor body 71, a rotating distributing trough 72 and a drive motor 73, the rotating distributing trough 72 is installed obliquely in the distributor body 71, its top is located at the top edge of the distributor body 71 and is connected to the drive motor 73 for transmission, and the bottom is located above the distributor 8 In the middle position, driven by the driving motor 73, the rotating distributing chute 72 rotates around the central axis of the vertical cold kiln 9; the distributor 8 is composed of an upper cylinder 81 and a plurality of discharge chutes 82 evenly distributed along the circumferential direction in the lower part (as shown in Figure 4) , the blanking chute 82 is a tapered structure enlarged downwards, and its discharge end is located in the upper space of the vertical cooling kiln 9; the bottom of the vertical cooling kiln 9 is provided with a central air duct air outlet 91 and an annular air duct air outlet 92, and the annular air duct air outlet 92 A plurality of air duct air outlets 92 are arranged along the outer edge of the vertical cooling kiln 9, and the central air duct and the annular air duct are respectively connected to blowers through air ducts; the bottom of the vertical cooling kiln 9 is provided with a plurality of discharge chutes 10 uniformly distributed along the circumferential direction , the bottom of the discharge chute 10 is connected to the belt conveyor 12; the top exhaust gas outlet of the vertical cold kiln 9 is connected to the gravity dust collector 13, and the high-temperature exhaust gas pipeline behind the gravity dust collector 13 is connected to the evaporator in the waste heat boiler 14, and the low-temperature exhaust gas pipeline passes through the cloth bag The dust collector and the induced draft fan are connected to the chimney 16.

The dust outlets of the gravity dust collector 13 , the bag filter and the waste heat boiler 14 are respectively connected to the chain conveyor 15 .

The waste heat boiler 14 is provided with an evaporator, a superheater, a condenser, a heater and a deaerator, and the evaporator is connected to the superheated steam inlet of the steam turbine through the superheater; the cooling steam outlet of the steam turbine is connected to the condenser, and the condenser passes through The condensate pump is connected to the desalinated water tank, the desalted water tank is connected to the heater and the deaerator through the feed water pump, and the superheated steam pipeline after the deaerator is connected to the evaporator through the feed water drum.

The bodies of the chute 3, the receiving chute 6, the rotating distribution chute 72, the distributor 8, and the discharge chute 10 are made of boiler steel plate or heat-resistant stainless steel, with or without lining as required, and the lining is made of high wear-resistant Manganese alloy steel plate or refractory material.

The vertical cold kiln 9 is provided with a lining layer from the inner wall above the air outlet 92 of the annular air duct. The lining layer is composed of an inner working layer and an outer insulating layer. The inner working layer is made of refractory bricks, and the outer insulating layer is fire-resistant The paint is formed and the lining is supported by the brick ring.

The chain bucket conveyor 5 is provided with a sealed heat preservation cover.

The drive motor 73 includes two motors symmetrically arranged on the top edge of the distributor body 71, the top edge of the distributor body 71 is provided with a ring gear, the ring gear rotates under the drive of the motor, and meshes with the gear on the top of the rotary distribution tank 72 Transmission drives the rotating distribution chute 72 to move along the top edge of the distributor body 71 and realizes the rotation of the rotating distribution chute 72 around the central axis of the vertical cold kiln 9 .

The number of the discharge chute 82 and the discharge chute 10 is 6.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Any equivalent replacement or change of the inventive concepts thereof shall fall within the protection scope of the present invention.

Claims (10)

1. The technological method of dragging the main exhaust fan of sintering by reclaiming the waste heat of sintering ore in a vertical cooling kiln is characterized in that it comprises the following steps: 1) The hot sintered ore above 700°C produced by the sintering machine is crushed by the single roll crusher and falls into the chute, and is fed to the chain bucket conveyor by the electric vibrating feeder, and then lifted into the vertical cooling kiln; the vertical cooling kiln The upper part is equipped with a rotary distributor and a distributor. The distributor is composed of a plurality of discharge chutes uniformly distributed along the circumference of the vertical cooling kiln; the sintered ore is discharged from the head of the chain bucket conveyor, and enters the rotary distributor through the receiving chute, and the rotary distribution The distributor distributes material along the circumference of the distributor, and the discharge chute is used for buffering the discharge and evenly distributes the hot sinter on the cross section of the vertical cooling kiln; the cold air in the vertical cooling kiln is provided by a blower, and the cold air is in the center of the lower part of the vertical cooling kiln The air outlet of the air duct and the air outlet of the circular air duct ensure the uniform distribution of cold air in the vertical cooling kiln; 2) In the vertical cooling kiln, the sintered ore and the cold air are subjected to countercurrent heat exchange, and the sintered ore with a temperature <135°C after cooling is discharged to the belt conveyor by multiple discharge chutes uniformly distributed at the bottom of the kiln and an electric vibrating feeder. The waste gas above 586℃ in the kiln is discharged from the kiln roof into the gravity dust collector for one-time dust removal, and the waste gas after dust removal is introduced into the waste heat boiler through the pipeline; 3) In the waste heat boiler, the exhaust gas exchanges heat with water, and the superheated steam generated is sent to the steam turbine; the low-temperature exhaust gas after heat exchange enters the bag filter for secondary dust removal, and the settled dust is collected together with the gravity dust collector and the waste heat boiler. The dust is transported together by the chain conveyor; the exhaust gas is sent to the chimney by the induced draft fan after the dust removal and purification reach the standard; 4) The steam turbine converts the thermal energy of the superheated steam into mechanical energy, drives the variable speed clutch to rotate and drives the synchronous motor to run, and the synchronous motor drives the blades of the sintering main exhaust fan to rotate to realize the operation of the sintering main exhaust fan; when the capacity of the steam turbine is sufficient, the remaining electric energy of the synchronous motor Connected to the grid for use; when the capacity of the steam turbine is insufficient, the synchronous motor takes power from the grid for the sintering main exhaust fan, and ensures the normal operation of the sintering main exhaust fan; 5) The cooling steam after dragging the steam turbine enters the waste heat boiler to realize recycling; firstly, it is condensed by the condenser, and the condensed water is pumped from the condensed water to the desalinated water tank, and then sent to the heater and deaerator in sequence through the low-pressure feed water pump for heating, After deoxygenation, it is sent to the feed water steam drum, and then after passing through the evaporator and superheater, superheated steam is generated and sent to the steam turbine. 2. The process of reclaiming sinter waste heat from a vertical cold kiln according to claim 1 to drag the sintering main exhaust fan, characterized in that, the rotary distributor, blower, electric vibration feeder one, electric vibration feeder The driving device of the second machine is controlled by frequency conversion to ensure the stability of the material surface in the vertical cooling kiln and the adequacy and uniformity of the cooling of the hot sinter. 3. for realizing the process system described in claim 1, reclaiming the sinter waste heat of the vertical cold kiln to drag the sintering main exhaust fan with the vertical cold kiln, it is characterized in that it comprises a vertical cold kiln, a gravity dust collector, Waste heat boiler, steam turbine, variable speed clutch, synchronous motor and sintering main exhaust fan; a material receiving chute is provided above the hot sinter feed inlet on the top of the vertical cold kiln, and the single roll crusher after the sintering machine passes through the chute, electric vibration feeding The first machine and the chain bucket conveyor are connected to the material receiving chute; the bottom of the material receiving chute is connected to the distributor through the rotary distributor. The rotary distributor is composed of the distributor body, the rotary distributor chute and the driving motor. The rotary distributor body is inclined inside the distributor body. The top is located on the top edge of the distributor body and is connected to the driving motor for transmission, and the bottom is located in the middle above the distributor. Driven by the driving motor, the rotating distributing trough rotates around the central axis of the vertical cooling kiln; the distributor consists of an upper cylinder and a lower multiple Consisting of two uniformly distributed discharge chute along the circumference, the discharge chute is a tapered structure expanding downwards, and its discharge end is set in the upper space of the vertical cooling kiln; the lower part of the vertical cooling kiln is provided with a central air duct outlet and a circular air duct Air outlet, circular air duct Multiple air outlets are set along the outer edge of the vertical cooling kiln, and the central air duct and annular air duct are respectively connected to the blower through the air duct; the bottom of the vertical cooling kiln is equipped with multiple discharge chutes uniformly distributed along the circumferential direction , the bottom of the discharge chute is connected to the belt conveyor; the top exhaust gas outlet of the vertical cold kiln is connected to the gravity dust collector, the high-temperature exhaust gas pipeline after the gravity dust collector is connected to the evaporator in the waste heat boiler, and the low-temperature exhaust gas pipeline is connected through the bag filter and the induced draft fan chimney. 4. The process system for recovering sinter waste heat from a vertical cold kiln to drive the sintering main exhaust fan according to claim 3, characterized in that the dust outlets of the gravity dust collector, bag filter and waste heat boiler are respectively connected to chain plates conveyor. 5. The process system of reclaiming sinter waste heat from vertical cooling kiln according to claim 3 to drive the sintering main exhaust fan, characterized in that, the waste heat boiler is provided with an evaporator, a superheater, a condenser, a heater and Deaerator, the evaporator is connected to the superheated steam inlet of the steam turbine through the superheater; the cooling steam outlet of the steam turbine is connected to the condenser, and the condenser is connected to the desalted water tank through the condensate pump, and the desalted water tank is connected to the heater and the deaerator through the feed water pump , the superheated steam pipeline after the deaerator is connected to the evaporator through the water supply drum. 6. The process system of reclaiming sinter waste heat from vertical cooling kiln to drag sintering main exhaust fan according to claim 3, characterized in that, the chute, receiving chute, rotating distribution chute, distributor, and discharging chute The main body is made of boiler steel plate or heat-resistant stainless steel, with or without lining as required, and the inner lining is made of high wear-resistant manganese alloy steel plate or refractory material. 7. The process system for recovering sinter waste heat from a vertical cooling kiln to drag the sintering main exhaust fan according to claim 3, characterized in that, the inner wall of the vertical cooling kiln above the air outlet of the annular air duct is provided with a lining layer, and the lining layer The layer is composed of an inner working layer and an outer insulation layer. The inner working layer is made of refractory bricks, the outer insulation layer is formed by fire-resistant spray paint, and the lining layer is supported by a brick ring. 8. The process system for driving the sintering main exhaust fan by recovering sinter waste heat from a vertical cooling kiln according to claim 3, characterized in that the chain bucket conveyor is provided with a sealed heat preservation cover. 9. The process system for recovering sinter waste heat from vertical cooling kiln to drive sintering main exhaust fan according to claim 3, characterized in that, the drive motors include 2 motors symmetrically arranged on the top edge of the distributor body, and the distributors A ring gear is set on the top edge of the distributor body, and the ring gear rotates under the drive of the motor, and is engaged with the gear set on the top of the rotating distribution chute to drive the rotating distribution trough to move along the top edge of the distributor body and realize the rotation of the distribution chute around the center of the vertical cold kiln axis rotation. 10. The process system for driving the sintering main exhaust fan by recovering sinter waste heat from a vertical cooling kiln according to claim 3, characterized in that the number of the feeding chute and the discharging chute is 6.