CN206916007U - A kind of new boiling limekiln - Google Patents

Abstract

The utility model discloses a novel boiling lime kiln, which belongs to an industrial kiln for calcining limestone. The utility model comprises a boiling calcination chamber, a cyclone separator 1 whose inlet is connected with the top outlet of the boiling calcination chamber, a cyclone separator 2 whose inlet is connected with the top outlet of the cyclone separator 1, and a bottom inlet and the top outlet of the cyclone separator 2. The connected boiling preheating chamber, the hot flue gas inlet is connected to the waste heat recovery device at the top outlet of the boiling preheating chamber, the flue gas inlet is connected to the hot flue gas outlet of the waste heat recovery device, and the flue gas dust collector is connected to the top of the flue gas dust collector The exhaust chimney connected to the outlet, the boiling cooling chamber connected to the combustion air outlet and the air inlet at the bottom of the boiling calcination chamber. The preheating, calcination and cooling of the material in the utility model are all completed in the boiling state, and the boiling calcination chamber mainly uses the circulating fluidized bed technology; it can ensure the complete firing of the product.

Description

A New Boiling Lime Kiln

technical field

The utility model relates to a novel boiling lime kiln, which belongs to an industrial kiln for calcining limestone.

Background technique

Limestone mining and ore primary processing produce a large amount of unusable scraps and stone powder which not only occupy land but also cause environmental pollution. A small part of them can be used as building stones and paving stones, but their utilization value is greatly reduced. At present, the kiln for calcining active lime can adapt to the limestone particle size of 20mm-80mm, and the suspension kiln can calcinate fine-grained stone powder below 2mm, but the grinding cost is high, which is not suitable for industrial production.

Utility model content

The technical problem to be solved by the utility model is to provide a new type of boiling lime kiln which can calcine limestone slag with particle size below 20mm into active lime.

In order to solve the above-mentioned technical problems, the technical solution adopted by the utility model is: a new type of boiling lime kiln, which is characterized in that it includes a boiling calcination chamber, a cyclone separator 1 connecting the inlet to the top outlet of the boiling calcination chamber, and the inlet and the cyclone Flow separator 1 is connected to the top outlet of the cyclone separator 2, the bottom inlet is connected to the boiling preheating chamber connected to the top outlet of the cyclone 2, the waste heat recovery device is connected to the hot flue gas inlet and the top outlet of the boiling preheating chamber, and the flue gas The flue gas dust collector whose inlet is connected to the hot flue gas outlet of the waste heat recovery device, the exhaust chimney connected to the flue gas outlet on the top of the flue gas dust collector, the boiling cooling chamber where the combustion air outlet is connected to the air inlet at the bottom of the boiling calcination chamber; The bottom of the cooling chamber is equipped with an ash discharge port and a primary fan, the side wall is connected to the boiling calcination chamber through a gravity overflow device, and the top inlet is provided with a scraper conveyor connected to the bottom outlet of the cyclone separator; the boiling calcination The bottom of the chamber is equipped with a combustion material supply device, which is connected to the high-temperature return device at the bottom outlet of the first cyclone separator on the side wall, and the high-temperature return device is connected to the side wall of the boiling preheating chamber through the second gravity overflow device , the bottom of the boiling preheating chamber is provided with a limestone feeding device, the cold air inlet of the waste heat recovery device is connected to the secondary fan, and the cold air outlet is connected to the high-temperature return device.

A further technical solution is that, the bottom inlet and the top outlet of the boiling preheating chamber form a circulation passage through a circulating driving fan.

A further technical solution is that the ash discharge port is connected to the inlet of the ash conveying device, the ash conveying device is connected to the boiling cooling chamber through a gravity overflow device three, and the gravity overflow device three is arranged on the side wall of the boiling cooling chamber .

A further technical solution is that the boiling cooling chamber, the boiling calcination chamber, the boiling preheating chamber and the bottom of the limestone feeding device are conical structures.

A further technical solution is that an air distribution plate is arranged at the bottom of the boiling cooling chamber, boiling calcination chamber and boiling preheating chamber.

A further technical solution is that the combustion substance supplied by the combustion substance supply device is coal or natural gas.

A further technical solution is that the cyclone separators 1 and 2 are both provided with a short pipe extending from the outlet at the top to the bottom of the inlet.

A further technical solution is that an ejector is provided at the bottom of the boiling preheating chamber, and the two top outlets of the cyclone separator are connected with the ejector provided at the bottom of the boiling preheating chamber; the bottom inlet of the boiling preheating chamber is connected with the The outlet at the top forms a circulation path by driving the fan and ejector in circulation.

The beneficial effects of adopting the above technical scheme are: the principle of boiling combustion and boiling heat exchange is adopted, that is, the preheating, calcination and cooling of the materials in the system are all completed in the boiling state, and the circulating fluidized bed technology is mainly used in the boiling calcination chamber. Secondly, the side of the boiling calcination chamber of the utility model is equipped with a cyclone separator and a high-temperature return device, which can return the incompletely fired powdery material to the calcination chamber again, so as to ensure the complete firing of the product.

During boiling calcination, the high combustion temperature of the prior art can be changed, so that the fuel is in a low-temperature combustion state between 850 and 950 ° C. Therefore, coal with a low ash melting point can be used, and the nitrogen oxides in the flue gas after combustion Very little or even no nitrogen oxides are produced, and the calcined material is limestone (a desulfurizer for conventional boilers), which makes the sulfur in the coal into _CaSO4 , so that the concentration of SO2 in the flue gas is greatly reduced, meeting the national energy conservation and emission reduction requirements Purpose of Policy Trends.

During the boiling heat exchange, because the material is in full contact with the high-temperature gas, the heat exchange speed is extremely fast, and the heat transfer efficiency is greatly improved. At the same time, the flue gas maximizes the heat transfer to the secondary combustion air through the waste heat recovery device to facilitate boiling combustion. It can reduce the unit heat consumption of the system.

The utility model relates to multiple fields such as comprehensive utilization of tailings waste resources, energy saving and consumption reduction, and environmental protection. After the application, the raw material cost of lime production enterprises can be significantly reduced, and at the same time, the mining efficiency of mines and the utilization rate of limestone resources can be improved, which is beneficial to the lime industry. Contribution to energy saving and consumption reduction and reduction of pollutant emissions is huge.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

Fig. 1-2 is the utility model embodiment respectively;

1. Primary fan; 2. Cooling chamber air distribution plate; 3. Boiling cooling chamber; 4. Gravity overflow device 1; 5. Calcination chamber air distribution plate; 6. Boiling calcination chamber; 7. Gravity overflow device 2; 8 1. Combustion material supply device; 9. High temperature return device; 10. Ejector; 11. Cyclone separator one; 12. Cyclone separator two; 13. Boiling preheating chamber; 14. Limestone feeding device; 15 1. Circulation drive fan; 16. Flue gas dust collector; 17. Flue gas induced draft fan; 18. Exhaust chimney; 19. Secondary fan; 20. Waste heat recovery device; 21. Scraper conveyor; 22. Gravity overflow device Three; 23, ash outlet; 24, ash conveying device.

detailed description

Below in conjunction with the accompanying drawings in the utility model embodiment, the technical solution in the utility model embodiment is clearly and completely described, obviously, the described embodiment is only a part of the utility model embodiment, rather than all implementation example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In the following description, a lot of specific details have been set forth in order to fully understand the utility model, but the utility model can also be implemented in other ways that are different from those described here, and those skilled in the art can do so without violating the connotation of the utility model. Under the circumstances, similar promotion is done, so the utility model is not limited by the specific embodiments disclosed below.

The utility model discloses a novel fluidized lime kiln, which comprises a fluidized calcination chamber 6, a swirl separator-11 whose inlet is connected with the top outlet of the fluidized calcination chamber 6, and a cyclone separator-11 whose inlet is connected with the top outlet of the cyclone separator-11. Separator 2 12, the boiling preheating chamber 13 connecting the bottom inlet to the top outlet of the cyclone separator 2 12, the waste heat recovery device 20 connecting the hot flue gas inlet to the top outlet of the boiling preheating chamber 13, the flue gas inlet and the waste heat recovery device 20 The flue gas dust collector 16 connected to the hot flue gas outlet, the exhaust chimney 18 connected to the flue gas outlet at the top of the flue gas dust collector 16, the boiling cooling chamber 3 connected to the combustion air outlet and the air inlet at the bottom of the boiling calcining chamber 6; The bottom of the boiling cooling chamber 3 is provided with an ash discharge port 23 and a primary fan 1. The side wall is connected to the boiling calcination chamber 6 through a gravity overflow device 17. The top inlet is provided with a scraper connected to the bottom outlet of the cyclone separator 212. Conveyor 21; the bottom of the boiling calcination chamber 6 is provided with a combustion material supply device 8, which is connected to the high-temperature return device 9 provided at the bottom outlet of the cyclone separator on the side wall, and the high-temperature return device 9 is connected to the boiling pre-heating device. The side wall of the hot chamber 13 is connected by a gravity overflow device 27, the bottom of the boiling preheating chamber 13 is provided with a limestone feeding device 14, and the cold air inlet of the waste heat recovery device 20 is connected with the secondary fan 19, and the cold air The outlet is connected with the high temperature return device 9.

Preferably, the inlet at the bottom and the outlet at the top of the boiling preheating chamber 13 form a circulation path through the circulating fan 15 .

Preferably, the ash discharge port 23 is connected to the inlet of the ash conveying device 24, and the ash conveying device 24 is connected to the boiling cooling chamber 3 through a gravity overflow device 3 22, and the gravity overflow device 3 22 is arranged on the boiling cooling chamber 3 side walls.

Preferably, the bottoms of the boiling cooling chamber 3, the boiling calcination chamber 6, the boiling preheating chamber 13 and the limestone feeding device 14 are conical structures.

Preferably, the bottoms of the boiling cooling chamber 3 , boiling calcining chamber 6 , and boiling preheating chamber 13 are provided with air distribution plates (cooling chamber air distribution plate 2 , calcining chamber air distribution plate 5 , and boiling preheating chamber air distribution plate).

Preferably, the combustion substance supplied by the combustion substance supply device 8 is solid fuel as shown in FIG. 1 or liquid or gaseous fuel as shown in FIG. 2 .

Preferably, the first and second cyclone separators 11 and 12 are all provided with a short pipe extending from the outlet at the top to the bottom of the inlet.

Preferably, the bottom of the boiling preheating chamber 13 is provided with an ejector 10, and the top outlet of the cyclone separator 12 is connected with the ejector 10 provided at the bottom of the boiling preheating chamber 13; the boiling preheating chamber 13 The inlet at the bottom and the outlet at the top form a circulation path through the circulating drive fan 15 and ejector 10 .

Preferably, the waste heat recovery device 20 is a gas-gas column and tube heat exchanger.

Preferably, the ejector 10 is a Venturi structure, and ejects the hot flue gas to the boiling preheating chamber 13 .

Preferably, the waste heat recovery device 20 is not limited to a tube heat exchanger, such as a heat pipe heat exchanger, a plate heat exchanger, a steam generator, a waste heat boiler, etc. are also possible. The installation position of the waste heat recovery device is not limited to behind the boiling preheating chamber 13 , it can also be installed at the front end of the boiling preheating chamber 13 .

Preferably, gravity overflow devices one, two, three 4, 7, 22 are all made up of overflow pipes, expansion joints, spouts, valves, and discharge pipes.

Preferably, the utility model can not only use low-calorific low-quality coal as fuel, but also gas fuels such as blast furnace gas, coke oven gas, converter gas, natural gas, producer gas, calcium carbide furnace gas, and mixed gas, as well as diesel oil, heavy oil, etc. and other liquid fuels.

First, the raw material enters the boiling preheating chamber 13 through the limestone feeding device 14, and in the boiling preheating chamber 13, the low-temperature raw material limestone and the high-temperature flue gas from the cyclone separator 12 perform boiling heat exchange (the circulating fluidized bed technology can Boiling heat exchange, boiling combustion), where there are circulating drive fan 15, boiling preheating chamber 13 ejector 10 to provide boiling power and high-temperature flue gas, the temperature of the flue gas after heat exchange drops to the set value and is output to waste heat recovery In the waste heat recovery device 20, the flue gas exchanges heat with the secondary combustion air provided by the secondary fan 19 again, and the low-temperature flue gas finally enters the flue gas dust collector 16 for dust removal treatment, and the waste gas that meets the emission standard passes through The flue gas induced draft fan 17 and the exhaust chimney 18 are exhausted into the atmosphere; and after the material reaches the design temperature, it is discharged to the high-temperature return device 9 through the gravity overflow device 27 and enters the boiling calcination chamber 6, and the high-temperature material is mixed with the boiling calcination chamber 6. The fuel coal supplied by the coal feeding device is mixed and boiled and roasted. At this time, the air distribution plate 5 in the calcining chamber provides the boiling power and the primary combustion air, and the secondary fan 19 provides the secondary combustion air and the return power; the calcined lime has a low density. , the particle size is small and it is located on the upper part of the uncalcined limestone, and it is discharged into the boiling cooling chamber 3 through the gravity overflow device-4 provided here, and the high-temperature active lime is mixed with the primary fan 1 and the boiling cooling chamber in the boiling cooling chamber 3 The primary air provided by the wind plate (2) performs boiling heat exchange, and the low-temperature lime is discharged to the ash conveying device 24 through the gravity overflow device 3 22, and the accumulation in the air distribution chamber (located at the lower part of the boiling cooling chamber air distribution plate of the boiling cooling chamber) The ash falls to the ash conveying device 24 through the ash discharge port 23; the air after cooling the high-temperature lime enters the air distribution chamber of the calcination chamber to provide boiling power and primary combustion-supporting air.

Claims (8)

1. A novel fluidized lime kiln, characterized in that: comprising a fluidized calcination chamber, a cyclone separator one connected to the outlet at the top of the fluidized calciner chamber at the inlet, and a cyclone separator two connected with the outlet at the top of the fluidized fluid separator one at the inlet, The bottom inlet is connected to the boiling preheating chamber with the second top outlet of the cyclone separator, the waste heat recovery device is connected to the hot flue gas inlet and the top outlet of the boiling preheating chamber, and the flue gas dust collector is connected to the flue gas inlet and the hot flue gas outlet of the waste heat recovery device device, an exhaust chimney connected to the flue gas outlet on the top of the flue gas dust collector, a boiling cooling chamber connected to the combustion air outlet and the air inlet at the bottom of the boiling calcination chamber; the bottom of the boiling cooling chamber is provided with an ash discharge port, a primary fan, and a side wall The gravity overflow device one is connected with the boiling calcination chamber, and the top inlet is provided with a scraper conveyor connected with the bottom outlet of the cyclone separator two; the bottom of the boiling calcination chamber is provided with a combustion material supply device, which is connected to the side wall The high-temperature feeder installed at the bottom outlet of cyclone separator 1 is connected to the side wall of the boiling preheating chamber through gravity overflow device 2, and the bottom of the boiling preheating chamber is equipped with a limestone feeding device , the cold air inlet of the waste heat recovery device is connected with the secondary fan, and the cold air outlet is connected with the high temperature return device. 2. A new type of fluidized lime kiln according to claim 1, characterized in that, the bottom inlet and top outlet of the boiling preheating chamber form a circulation path through a circulating driving fan. 3. A novel fluidized lime kiln according to claim 1, characterized in that the ash discharge port is connected to the inlet of the ash conveying device, and the ash conveying device is connected to the boiling cooling chamber through a gravity overflow device. The gravity overflow device three is arranged on the side wall of the boiling cooling chamber. 4. A new type of boiling lime kiln according to claim 1, characterized in that the boiling cooling chamber, boiling calcination chamber, boiling preheating chamber, and the bottom of the limestone feeding device are conical structures. 5. A new type of boiling lime kiln according to claim 1, characterized in that, the bottom of the boiling cooling chamber, boiling calcination chamber and boiling preheating chamber is provided with an air distribution plate. 6. A new type of fluidized lime kiln according to claim 1, characterized in that the combustion substance supplied by the combustion substance supply device is solid, liquid or gaseous fuel. 7. A novel fluidized lime kiln according to claim 1, characterized in that said cyclone separators one and two are provided with short pipes extending from the top outlet to the interior below the inlet. 8. A new type of boiling lime kiln according to claim 1, characterized in that, the bottom of the boiling preheating chamber is provided with an ejector, and the two top outlets of the cyclone separator are connected with the bottom of the boiling preheating chamber. The ejector is connected; the inlet at the bottom of the boiling preheating chamber and the outlet at the top form a circulation path through the circular driving fan and the ejector.