A suspension calcining system with the function of preventing limestone fine powder from agglomerating and blocking

Abstract

A kind of suspension calcining system with the function of preventing limestone fine powder from agglomerating and blocking, belongs to the calcination field of limestone, including preprocessing unit, preheating unit, calcining unit, cooling unit, tail gas treatment unit and product bin;The discharge end of preprocessing unit is communicated with the feed end of preheating unit, the discharge end of preheating unit is communicated with the feed end of calcining unit, the gas outlet of preheating unit is communicated with the gas inlet of tail gas treatment unit, the gas inlet of preheating unit is communicated with the gas outlet of calcining unit, the feed end of preheating unit is communicated with the discharge end of tail gas treatment unit, the discharge end of calcining unit is communicated with the feed end of cooling unit, the gas inlet of calcining unit is communicated with the gas outlet of cooling unit, the discharge end of cooling unit is communicated with product bin.The anti-blocking mode of the system is as follows: dry before preheating powder, which is beneficial to uniform dispersion;Precise control of temperature during calcination to avoid powder melting and caking;Add spiral discharger at discharge port to avoid product blockage.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of calcination of limestone, and particularly relates to a suspension calcination system with the function of preventing limestone fine powder from agglomerating and clogging. BACKGROUND

[0002] Suspension calcination technology is a technology that suspends solid particles in a gas stream for calcination at high temperatures. It was first applied in the metallurgical industry and has been widely used in metal smelting and alumina production. Suspension calcination technology has the advantages of uniform heat transfer, high efficiency, environmental protection, etc. With the implementation of national energy saving and emission reduction, double carbon and other environmental protection policies, suspension calcination technology has been widely applied in solid waste treatment, cement production and other fields.

[0003] Currently, suspension calcination technology is a key technology widely used in cement and lime production processes. Its working principle is to suspend limestone fine powder in a high-temperature gas stream to complete the calcination process in a short time. Compared with traditional rotary kiln calcination, suspension calcination has the advantages of uniform heating, fast calcination speed, and high thermal efficiency. However, suspension calcination technology still has some problems to be solved in actual production. These problems mainly include: first, the limestone fine powder is not uniformly dispersed during feeding, and agglomeration occurs during calcination, resulting in uneven heat transfer and ultimately affecting product quality; second, unloading is not smooth, often causing blockage, increasing heat consumption, and more seriously, damaging equipment and affecting normal production operation.

[0004] In order to solve the above problems, some improvement measures have been proposed in the prior art, but there are still deficiencies. For example, patent CN117049800A "High-stability calcium carbonate suspension calcination system and method" improves the stability of the entire suspension calcination system by setting a filtering device and a beating device in the gas flow channel, but relies too much on physical separation and mechanical beating methods, which can reduce fine powder agglomeration, but these methods often result in higher energy consumption and additional equipment wear. Patent CN116903272A "Powdered lime suspension calcination system with preheating and dispersion function" mentions a method of preheating and dispersing powdered lime, increasing gas flow speed and adjusting gas flow distribution to reduce fine powder deposition, but fails to effectively solve the problem of fine powder agglomeration in high-temperature environments. SUMMARY

[0005] In view of the deficiencies of the prior art, in order to solve the above problems, the limestone powder is first fed into the airflow dryer before being fed into the preheater, the moisture in the limestone powder is removed, so that the powder remains dry and loose, and is uniformly dispersed in the preheater. After the powder is preheated by the preheating system, it is fed into the suspension calcining furnace by the feeding device, the temperature in the suspension calcining furnace is accurately controlled, and the product after calcination is cooled in the cooling system through the hot gas after cyclone separation, or is cooled in the cooling system through the spiral discharge port at the bottom of the calcining furnace. The cooled lime powder is transferred to the product bin by the conveying device.

[0006] A suspension calcining system with the function of preventing limestone powder from agglomerating and blocking, comprising a pretreatment unit, a preheating unit, a calcining unit, a cooling unit, a tail gas treatment unit and a product bin; the discharge end of the pretreatment unit is in communication with the feeding end of the preheating unit, the discharge end of the preheating unit is in communication with the feeding end of the calcining unit, the gas outlet end of the preheating unit is in communication with the gas inlet end of the tail gas treatment unit, the gas inlet end of the preheating unit is in communication with the gas outlet end of the calcining unit, the feeding end of the preheating unit is in communication with the discharge end of the tail gas treatment unit, the discharge end of the calcining unit is in communication with the feeding end of the cooling unit, the gas inlet end of the calcining unit is in communication with the gas outlet end of the cooling unit, and the discharge end of the cooling unit is in communication with the product bin.

[0007] The pretreatment unit comprises a limestone powder feeding bin and an airflow dryer, the bottom of the limestone powder feeding bin is provided with a discharge port connected with the feeding port of the airflow dryer, and the airflow dryer is provided with a discharge port below.

[0008] The preheating unit comprises a first-stage cyclone preheater, a second-stage cyclone preheater, a third-stage cyclone preheater and a first feeder; one side of the first-stage cyclone preheater is provided with a feeding port, the other side is provided with a gas inlet, the top is provided with a gas outlet, and the bottom is provided with a discharge port; the feeding port of the first-stage cyclone preheater is connected with the discharge port of the airflow dryer, the gas inlet of the first-stage cyclone preheater is connected with the gas outlet at the top of the second-stage cyclone preheater, and the discharge port of the first-stage cyclone preheater is connected with the first feeding port on one side of the second-stage cyclone preheater; one side of the second-stage cyclone preheater is provided with a gas inlet, the other side is provided with a second feeding port, and the bottom is provided with a discharge port; the gas inlet of the second-stage cyclone preheater is connected with the gas outlet at the top of the third-stage cyclone preheater, and the discharge port of the second-stage cyclone preheater is connected with the feeding port on one side of the third-stage cyclone preheater; one side of the third-stage cyclone preheater is provided with a gas inlet, and the bottom is provided with a discharge port; the discharge port of the third-stage cyclone preheater is connected with the feeding port of the first feeder.

[0009] The calcination unit comprises a gas feeding device, a suspension calcination furnace and a cyclone separator; the suspension calcination furnace is provided with a feeding port on one side, first and second gas inlets on two sides, a gas outlet on the other side, and a discharging port at the bottom; the feeding port of the suspension calcination furnace is connected with the discharging port of the first feeder; the first and second gas inlets of the suspension calcination furnace are connected with the gas feeding device; and the gas outlet of the suspension calcination furnace is connected with the first gas inlet of the cyclone separator on one side.

[0010] The cooling unit comprises a first-stage cyclone cooler, a second-stage cyclone cooler, a third-stage cyclone cooler and a fan; the first-stage cyclone cooler is provided with a first feeding port and a gas outlet at the top, a second feeding port and a gas inlet on one side, and a discharging port at the bottom; the first feeding port of the first-stage cyclone cooler is connected with the discharging port of the cyclone separator; the gas outlet of the first-stage cyclone cooler is connected with the second gas inlet of the cyclone separator; the second feeding port of the first-stage cyclone cooler is connected with the discharging port of the suspension calcination furnace; the gas inlet of the first-stage cyclone cooler is connected with the gas outlet at the top of the second-stage cyclone cooler; the discharging port at the bottom of the first-stage cyclone cooler is connected with the feeding port on one side of the second-stage cyclone cooler; the second-stage cyclone cooler is provided with a gas inlet on one side and a discharging port at the bottom; the gas inlet of the second-stage cyclone cooler is connected with the gas outlet at the top of the third-stage cyclone cooler; the discharging port of the second-stage cyclone cooler is connected with the feeding port on one side of the third-stage cyclone cooler; the third-stage cyclone cooler is provided with a gas inlet on one side and a discharging port at the bottom; the gas inlet of the third-stage cyclone cooler is connected with the fan; and the discharging port of the third-stage cyclone cooler is in communication with the product bin.

[0011] The tail gas treatment unit comprises a dust collector, an ash storage bin, a second feeder and a chimney; the dust collector is provided with a gas inlet on one side, a gas outlet on the other side, and a discharging port at the bottom; the gas inlet of the dust collector is connected with the gas outlet of the first-stage cyclone preheater; the gas outlet of the dust collector is in communication with the chimney; and the discharging port of the dust collector is connected with the feeding port at the top of the ash storage bin; the ash storage bin is provided with a discharging port at the bottom, which is connected with the feeding port of the second feeder; and the discharging port of the second feeder is connected with the second feeding port of the second-stage cyclone preheater.

[0012] The airflow dryer is an airflow dryer with drying and stirring and dispersing functions.

[0013] The inner surface of the furnace body of the suspension calcination furnace is provided with a heating layer, the feeding port of the suspension calcination furnace is arranged at the upper end of one side, and the first air inlet is arranged at the lower end of the same side of the feeding port; the gas outlet of the suspension calcination furnace is arranged at the upper end of the other side, and the second air inlet of the suspension calcination furnace is arranged at the lower end of the same side of the gas outlet; the middle of the furnace body of the suspension calcination furnace is provided with a partition plate, the middle of the partition plate of the suspension calcination furnace is provided with a powder passage hole, and the bottom end of the partition plate of the suspension calcination furnace is provided with a guide plate; the discharge port of the suspension calcination furnace is internally provided with a spiral discharger.

[0014] Compared with the prior art, the beneficial effects and innovative points of the present application are that:

[0015] 1. The limestone powder is first dried in the dryer before being fed into the preheating system, so that the limestone powder remains dry, which is beneficial to the uniform dispersion of the limestone fine powder in the reaction device and ensures that the calcined product has high quality.

[0016] 2. Compared with the traditional process, the suspension calcination technology has higher automation degree, can accurately control the calcination temperature and airflow speed in the suspension calcination furnace, avoids the melting and caking of the powder caused by excessively high temperature and excessively fast or slow airflow, and improves the continuity of the calcination process.

[0017] 3. The discharge port of the suspension calcination furnace is provided with a spiral discharger, which avoids the clogging of the discharge port by the calcined product, enables the calcined product to be continuously and smoothly fed into the cooling system, and improves the stability and sustainability of the whole process. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A suspension calcination system with a function of preventing limestone fine powder from agglomerating and clogging, according to the present application, is shown in the structural diagram;

[0019] Wherein: 1-limestone powder feeding bin, 2-airflow dryer, 3-first stage cyclone preheater, 4-second stage cyclone preheater, 5-third stage cyclone preheater, 6-first feeder, 7-gas feeding device, 8-suspension calcination furnace, 9-cyclone separator, 10-first stage cyclone cooler, 11-second stage cyclone cooler, 12-third stage cyclone cooler, 13-fan, 14-dust collector, 15-ash storage bin, 16-second feeder, 17-chimney, 18-product bin;

[0020] Figure 2 A suspension calcination furnace in the suspension calcination system, according to the present application, is shown in the structural diagram;

[0021] Wherein: 81-furnace body, 82-feeding port, 83-first air inlet, 84-gas outlet, 85-partition plate, 86-guide plate, 87-second air inlet, 88-discharge port, 89-spiral discharger, 810-powder passage hole, 811-heating layer. DETAILED DESCRIPTION

[0022] Embodiment 1

[0023] A suspension calcination system with the function of preventing limestone fine powder from agglomerating and clogging, a device schematic diagram thereof is shown as Figure 1 The front treatment unit, the preheating unit, the calcination unit, the cooling unit, the tail gas treatment unit and the product bin 18 are connected in series. The discharge end of the front treatment unit is communicated with the feeding end of the preheating unit, the discharge end of the preheating unit is communicated with the feeding end of the calcination unit, the gas outlet end of the preheating unit is communicated with the gas inlet end of the tail gas treatment unit, the gas inlet end of the preheating unit is communicated with the gas outlet end of the calcination unit, the feeding end of the preheating unit is communicated with the discharge end of the tail gas treatment unit, the discharge end of the calcination unit is communicated with the feeding end of the cooling unit, the gas inlet end of the calcination unit is communicated with the gas outlet end of the cooling unit, and the discharge end of the cooling unit is communicated with the product bin 18.

[0024] The front treatment unit includes a limestone powder feeding bin 1 and an air flow dryer 2. The bottom of the limestone powder feeding bin 1 is provided with a discharge port, which is connected with the feeding port of the air flow dryer 2 through a conveying device. The air flow dryer 2 is an air flow dryer with drying and stirring and dispersing functions, and is provided with a discharge port at the bottom. The air flow dryer 2 can dry and stir and disperse the limestone fine powder in it, so as to avoid agglomeration and adhesion of the limestone fine powder, and make the limestone fine powder in a granular loose and flowing state.

[0025] The preheating unit comprises a first-stage cyclone preheater 3, a second-stage cyclone preheater 4, a third-stage cyclone preheater 5 and a first feeder 6; the first-stage cyclone preheater 3 is provided with an inlet on one side, an air inlet on the other side, an air outlet at the top and a discharge outlet at the bottom; the inlet of the first-stage cyclone preheater 3 is connected with the discharge outlet of the airflow dryer 2; the limestone powder after drying is fed into the first-stage cyclone preheater 3 through the discharge outlet below the airflow dryer 2; the air inlet of the first-stage cyclone preheater 3 is connected with the air outlet at the top of the second-stage cyclone preheater 4 through a flue gas passage, so as to realize the passage of flue gas into the first-stage cyclone preheater 3; the discharge outlet of the first-stage cyclone preheater 3 is connected with the first inlet on one side of the second-stage cyclone preheater 4; the powder after the first-stage preheating is fed into the second-stage cyclone preheater 4; the second-stage cyclone preheater 4 is provided with an air inlet on one side, a second inlet on the other side and a discharge outlet at the bottom; the air inlet of the second-stage cyclone preheater 4 is connected with the air outlet at the top of the third-stage cyclone preheater 5 through a flue gas passage; the hot gas in the third-stage cyclone preheater 5 enters the second-stage cyclone preheater 4 through the flue gas passage; after heat exchange, the hot gas in the second-stage cyclone preheater 4 enters the first-stage cyclone preheater 3 through the flue gas passage to participate in the first-stage preheating; the discharge outlet of the second-stage cyclone preheater 4 is connected with the inlet on one side of the third-stage cyclone preheater 5; the powder after the second-stage preheating is fed into the third-stage cyclone preheater 5; the third-stage cyclone preheater 5 is provided with an air inlet on one side and a discharge outlet at the bottom; the discharge outlet of the third-stage cyclone preheater 5 is connected with the inlet of the first feeder 6.

[0026] The calcining unit comprises a gas supply device 7, a suspension calcining furnace 8 and a cyclone separator 9; the suspension calcining furnace 8 is provided with an inlet 82 on one side, a first air inlet 83 and a second air inlet 87 on two sides, an air outlet 84 on the other side and a discharge outlet 88 at the bottom; the structure diagram is as shown in Figure 2As shown, the inner surface of the furnace body 81 of the suspension calcining furnace 8 is provided with a heating layer 811, which can make the temperature in the calcining furnace reach the preset temperature and keep the temperature in the calcining furnace stable; the feeding port 82 of the suspension calcining furnace 8 is arranged at the upper end of one side, and the first air inlet 83 is arranged at the lower end of the same side of the feeding port 82; the gas outlet 84 of the suspension calcining furnace 8 is arranged at the upper end of the other side, and the second air inlet 87 is arranged at the lower end of the same side of the gas outlet 84; the furnace body 81 of the suspension calcining furnace 8 is provided with a partition plate 85 in the middle, which plays a role in increasing the negative pressure in the suspension calcining furnace 8 and is conducive to keeping the limestone powder in a suspended flow state; the partition plate 85 of the suspension calcining furnace 8 is provided with a powder passage hole 810 in the middle, and the partition plate 85 of the suspension calcining furnace 8 is provided with a guide plate 86 at the bottom end, which facilitates the smooth discharge of the calcined products into the discharge port 88; the discharge port 88 of the suspension calcining furnace 8 is provided with a spiral discharger 89 inside, which uniformly takes out the calcined products under the continuous rotation of the spiral blades, avoiding the accumulation and caking of the materials at the discharge port. The feeding port 82 of the suspension calcining furnace 8 is connected with the discharge port of the first feeder 6, and after the third preheating, the powder passes through the first feeder 6, controls the feeding speed, and is fed into the suspension calcining furnace 8 for calcination; the first air inlet 83 and the second air inlet 87 of the suspension calcining furnace 8 are connected with the gas supply equipment 7, and air enters the suspension calcining furnace 8 through the gas supply equipment 7, and the limestone powder is in a suspended flow state under the action of high-temperature gas flow; the gas outlet 84 of the suspension calcining furnace 8 is connected with the first air inlet of one side of the cyclone separator 9 through a flue gas passage, and the hot gas in the furnace entrains part of the calcined products and enters the cyclone separator 9 through the flue gas passage; the top of the cyclone separator 9 is provided with a gas outlet, and the bottom is provided with a discharge port and a second air inlet; the gas in the cyclone separator 9 comes from two aspects, one is the high-temperature gas flow from the suspension calcining furnace 8, and the other is the rising flue gas from the first-stage cyclone cooler 10; under the action of the two kinds of gas, the temperature in the cyclone separator 9 is 750-850℃; the gas outlet of the cyclone separator 9 is connected with the air inlet of the third-stage cyclone preheater 5 through a flue gas passage, and the hot air in the cyclone separator 9 enters the third-stage cyclone preheater 5 through the flue gas pipeline; the temperature in the third-stage cyclone preheater 5 is 800-850℃.

[0027] The cooling unit comprises a first-stage cyclone cooler 10, a second-stage cyclone cooler 11, a third-stage cyclone cooler 12 and a fan 13. The first-stage cyclone cooler 10 is provided with a first feeding port and an air outlet at the top, a second feeding port and an air inlet at one side, and a discharge port at the bottom. The first feeding port of the first-stage cyclone cooler 10 is connected with the discharge port of the cyclone separator 9. The air outlet of the first-stage cyclone cooler 10 is connected with the second air inlet of the cyclone separator 9 through a flue gas passage. The second feeding port of the first-stage cyclone cooler 10 is connected with the discharge port 88 of the suspension calcining furnace 8. Another part of the calcined products in the suspension calcining furnace 8 is fed into the first-stage cyclone cooler 10 through a bottom discharge device. After the two parts of the powder are cooled for the first time in the first-stage cyclone cooler 10, they are fed into the second-stage cyclone cooler 11 for cooling. The air inlet of the first-stage cyclone cooler 10 is connected with the air outlet at the top of the second-stage cyclone cooler 11 through a flue gas passage. The discharge port at the bottom of the first-stage cyclone cooler 10 is connected with the feeding port at one side of the second-stage cyclone cooler 11. The second-stage cyclone cooler 11 is provided with an air inlet at one side and a discharge port at the bottom. The air inlet of the second-stage cyclone cooler 11 is connected with the air outlet at the top of the third-stage cyclone cooler 12 through a flue gas passage. The discharge port of the second-stage cyclone cooler 11 is connected with the feeding port at one side of the third-stage cyclone cooler 12. After being cooled for the second time, the powder is fed into the third-stage cyclone cooler 12 for cooling for the third time. The third-stage cyclone cooler 12 is provided with an air inlet at one side and a discharge port at the bottom. The air inlet of the third-stage cyclone cooler 12 is connected with the fan 13. Cooling air is sent into the third-stage cyclone cooler 12 through the fan 13 to realize rapid cooling of the powder in the third-stage cyclone cooler 12. Then, the air in the third-stage cyclone cooler 12 enters the first-stage cyclone cooler 10 through the air outlet and the flue gas passage. After heat exchange, the gas enters the cyclone separator 9 through the flue gas passage. After being cooled for the third time, the temperature of the powder is reduced to a specified range. The powder is removed from the discharge port of the third-stage cyclone cooler 12 through a conveying device and is moved into a product bin 18.

[0028] The tail gas treatment unit comprises a dust remover 14, an ash storage bin 15, a second feeder 16 and a chimney 17. The dust remover 14 is provided with an air inlet on one side, an air outlet on the other side and a discharge port at the bottom. The air inlet of the dust remover 14 is connected with the air outlet of the first-stage cyclone preheater 3 through a flue gas passage. The air outlet of the dust remover 14 is connected with the chimney 17 through a pipeline. The flue gas in the first-stage cyclone preheater 3 enters the dust remover 14 through the flue gas passage. After the flue gas is separated in the dust remover 14, the qualified exhaust gas is discharged from the chimney 17 through the pipeline. The discharge port of the dust remover 14 is connected with the feed inlet at the top of the ash storage bin 15. The bottom of the ash storage bin 15 is provided with a discharge port which is connected with the feed inlet of the second feeder 16. The discharge port of the second feeder 16 is connected with the second feed inlet of the second-stage cyclone preheater 4. The material in the ash storage bin 15 is fed into the second-stage cyclone preheater 4 through the second feeder 16.

Claims

1. A suspension calcination system with the function of preventing limestone fine powder from agglomerating and clogging, characterized in that, It includes a pretreatment unit, a preheating unit, a calcination unit, a cooling unit, an exhaust gas treatment unit, and a product silo; the discharge end of the pretreatment unit is connected to the feed end of the preheating unit, the discharge end of the preheating unit is connected to the feed end of the calcination unit, the exhaust end of the preheating unit is connected to the inlet end of the exhaust gas treatment unit, the inlet end of the preheating unit is connected to the exhaust end of the calcination unit, the feed end of the preheating unit is connected to the discharge end of the exhaust gas treatment unit, the discharge end of the calcination unit is connected to the feed end of the cooling unit, the inlet end of the calcination unit is connected to the exhaust end of the cooling unit, and the discharge end of the cooling unit is connected to the product silo. The calcination unit includes a suspension calcination furnace. The inner surface of the suspension calcination furnace is provided with a heating layer. A partition is vertically arranged in the middle of the furnace body. A powder channel hole is provided in the middle of the partition. A guide plate is provided at the bottom of the partition. A vertical spiral discharger is provided inside the discharge port of the suspension calcination furnace.

2. The suspension calcination system with the function of preventing limestone fine powder from agglomerating and clogging, as described in claim 1, is characterized in that... The pretreatment unit includes a limestone powder feed hopper and an airflow dryer. The limestone powder feed hopper has a discharge port at the bottom, which is connected to the inlet of the airflow dryer. The airflow dryer has a discharge port at the bottom.

3. The suspension calcination system with the function of preventing limestone fine powder from agglomerating and clogging, as described in claim 2, is characterized in that... The preheating unit includes a first-stage cyclone preheater, a second-stage cyclone preheater, a third-stage cyclone preheater, and a first feeder. The first-stage cyclone preheater has a feed inlet on one side, an air inlet on the other side, an air outlet at the top, and a discharge outlet at the bottom. The feed inlet of the first-stage cyclone preheater is connected to the discharge outlet of the airflow dryer. The air inlet of the first-stage cyclone preheater is connected to the air outlet at the top of the second-stage cyclone preheater. The discharge outlet of the first-stage cyclone preheater is connected to the discharge outlet of the second-stage cyclone preheater. The first feed inlet on one side is connected to the second stage cyclone preheater; the second stage cyclone preheater has an air inlet on one side and a second feed inlet on the other side, and a discharge outlet at the bottom. The air inlet of the second stage cyclone preheater is connected to the air outlet at the top of the third stage cyclone preheater, and the discharge outlet of the second stage cyclone preheater is connected to the feed inlet on one side of the third stage cyclone preheater. The third stage cyclone preheater has an air inlet on one side and a discharge outlet at the bottom, and the discharge outlet of the third stage cyclone preheater is connected to the feed inlet of the first feeder.

4. The suspension calcination system with the function of preventing limestone fine powder from agglomerating and clogging, as described in claim 3, is characterized in that... The calcination unit includes a gas supply device, the suspension calcination furnace, and a cyclone separator. The suspension calcination furnace has a feed inlet on one side, a first air inlet and a second air inlet on both sides, an air outlet on the other side, and a discharge outlet at the bottom. The feed inlet of the suspension calcination furnace is connected to the discharge outlet of the first feeder. The first and second air inlets of the suspension calcination furnace are connected to the gas supply device. The air outlet of the suspension calcination furnace is connected to the first air inlet on one side of the cyclone separator. The cyclone separator has an air outlet at the top, a discharge outlet and a second air inlet at the bottom, and the air outlet of the cyclone separator is connected to the air inlet of the third-stage cyclone preheater.

5. A suspension calcination system for preventing limestone powder from clumping and clogging, as described in claim 4, is characterized in that... The cooling unit includes a first-stage cyclone cooler, a second-stage cyclone cooler, a third-stage cyclone cooler, and a fan. The first-stage cyclone cooler has a first feed inlet and an air outlet at its top, a second feed inlet and an air inlet on one side, and an outlet at its bottom. The first feed inlet of the first-stage cyclone cooler is connected to the outlet of the cyclone separator, the air outlet of the first-stage cyclone cooler is connected to the second air inlet of the cyclone separator, the second feed inlet of the first-stage cyclone cooler is connected to the outlet of the suspension calcining furnace, and the air inlet of the first-stage cyclone cooler is connected to the outlet at the top of the second-stage cyclone cooler. The air inlets are connected to each other. The discharge port at the bottom of the first-stage cyclone cooler is connected to the inlet on one side of the second-stage cyclone cooler. The second-stage cyclone cooler has an air inlet on one side and a discharge port at the bottom. The air inlet of the second-stage cyclone cooler is connected to the air outlet at the top of the third-stage cyclone cooler. The discharge port of the second-stage cyclone cooler is connected to the inlet on one side of the third-stage cyclone cooler. The third-stage cyclone cooler has an air inlet on one side and a discharge port at the bottom. The air inlet of the third-stage cyclone cooler is connected to the fan. The discharge port of the third-stage cyclone cooler is connected to the product compartment.

6. A suspension calcination system for preventing limestone powder from clumping and clogging, as described in claim 5, is characterized in that... The exhaust gas treatment unit includes a dust collector, an ash storage silo, a second feeder, and a chimney. The dust collector has an air inlet on one side, an air outlet on the other side, and a discharge outlet at the bottom. The air inlet of the dust collector is connected to the air outlet of the first-stage cyclone preheater. The air outlet of the dust collector is connected to the chimney. The discharge outlet of the dust collector is connected to the feed inlet at the top of the ash storage silo. The bottom of the ash storage silo has a discharge outlet connected to the feed inlet of the second feeder. The discharge outlet of the second feeder is connected to the second feed inlet of the second-stage cyclone preheater.

7. A suspension calcination system for preventing limestone powder from clumping and clogging, as described in claim 2, is characterized in that... The airflow dryer is an airflow dryer with both drying and stirring / dispersing functions.

8. A suspension calcination system for preventing limestone powder from clumping and clogging, as described in claim 4, is characterized in that... The feed inlet of the suspension calcining furnace is located at the upper end of one side, and the first air inlet is located at the lower end of the same side as the feed inlet; the air outlet of the suspension calcining furnace is located at the upper end of the other side, and the second air inlet of the suspension calcining furnace is located at the lower end of the same side as the air outlet.

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