Ammonium sulfate drying, spraying and water replenishing system

Abstract

The utility model discloses an ammonium sulfate drying, spraying and water replenishing system which comprises a belt conveyor, a drying bed main body, a heat exchanger, a cyclone dust collector, a water washing dust collector and an evaporation raw water tank, one end of the heat exchanger is connected into heat source steam, the other end of the heat exchanger is connected into a condensation bolt pipe network, the heat exchanger inputs air through the air blower for heat exchange to form hot air, and the hot air enters the drying bed main body, passes through the cyclone dust collector and then passes through the washing dust collector for secondary dust removal. The system has the beneficial effects that the problems of tail gas dust and smell in the ammonium sulfate drying process can be solved, the problems of dust particles and hot gas drifting in the tail gas are solved, crystals in the tail gas are recycled, and particulate matter pollution caused by direct exhaust of the tail gas is reduced; the problem that other water is introduced is effectively avoided, the evaporation water amount of the system is reduced, and water resource consumption of a large amount of spraying water is avoided.

Description

Technical Field

[0008]

[0001] The utility model relates to the technical field of waste gas treatment in ammonium sulfate production, and particularly relates to an ammonium sulfate drying spray water replenishment system. Background Art

[0002] The ammonium sulfate drying spray water replenishment system is an environmental protection and process auxiliary system supporting the ammonium sulfate production process, mainly used to treat the tail gas generated in the drying link, and solve problems such as dust pollution, harmful gas emission and resource recovery.

[0003] The wet ammonium sulfate salt is dehydrated and dried by a centrifuge to form a wet basis with a moisture content of 4%, and is dried by a fluidized bed to form a dry basis with a moisture content of less than 0.5%. During the drying process, particles with dust will be formed, and it is necessary to effectively capture the entrained particle crystals and recover ammonium sulfate.

[0004] Therefore, this application proposes an ammonium sulfate drying spray water replenishment system, which is used to eliminate the problems of tail gas dust and odor during the ammonium sulfate drying process, spray and purify the formed tail gas, and reduce the introduction of external production makeup water. Summary of the Utility Model

[0005] By providing an evaporation crystallization thickener solid-liquid separation system in the embodiments of this application, this set of systems can eliminate the problems of tail gas dust and odor during the ammonium sulfate drying process, spray and purify the formed tail gas, neutralize the alkaline gas in the tail gas, eliminate the problems of dust particles and hot gas dispersion in the tail gas, and recover the crystals in the tail gas, reducing the particulate matter pollution caused by direct tail gas discharge.

[0006] The embodiments of this application provide an ammonium sulfate drying spray water replenishment system, including: a belt conveyor, a drying bed main body, a heat exchanger, a cyclone dust collector, a water washing dust collector and an evaporation raw water tank. The belt conveyor transports the ammonium sulfate discharged from the centrifuge to the drying bed main body. One end of the heat exchanger is connected to the heat source steam and the other end is connected to the condensate pipe network. The heat exchanger exchanges heat by inputting air through a blower to form hot air. After the hot air enters the drying bed main body, it passes through the cyclone dust collector and then passes through the water washing dust collector for secondary dust removal. The cyclone dust collector and the drying bed main body are connected to a receiving bin. The water washing dust collector is connected to the evaporation raw water tank through a pipeline, and is connected to industrial water through a pipeline in cooperation with a valve. The bottom of the water washing dust collector introduces the internal liquid into the spray device through a pipeline in cooperation with a drying circulation pump. The spray device is arranged in the upper section inside the water washing dust collector.

[0007] Further, the hot air takes away the free water and fine powder crystals in the crystals in the drying bed main body and enters the cyclone dust collector

[0008] Furthermore, the cyclone dust collector operates via a vibrating motor, and the hot air after dust removal inside the cyclone dust collector is introduced into the water washing dust collector by an induced draft fan. The hot air is introduced at the lower section of the water washing dust collector.

[0009] Furthermore, the ammonium sulfate in the main body of the drying bed and the dust in the cyclone dust collector are periodically discharged into the receiving hopper.

[0010] Furthermore, the evaporation raw water tank uses a drying water pump to transport the internal liquid from the inlet to the water washing dust collector, and the water washing dust collector discharges the liquid inside the water washing dust collector from the outlet to the evaporation raw water tank through a pipe. The position of the inlet is higher than the position of the outlet.

[0011] Furthermore, a spray device is provided at the other end of the industrial water connection pipe, an air outlet is provided at the top of the water washing dust collector, and packing material is provided in the middle section of the water washing dust collector.

[0012] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0013] This system can eliminate the problems of dust and odor in the tail gas during the drying process of ammonium sulfate. It uses a heat exchanger to deliver hot air to the main body of the drying bed to dry the ammonium sulfate. The dust generated is removed by a cyclone dust collector, and then the tail gas is sprayed and purified by a water washing dust collector to neutralize the alkaline gas in the tail gas, eliminate the problem of dust particles and hot gas dispersion in the tail gas, and recover crystals in the tail gas to reduce particulate pollution caused by direct discharge of tail gas.

[0014] By pumping liquid out of the water-washing dust collector for circulating spraying, the problem of introducing other water is effectively avoided, the amount of water evaporated from the system is reduced, and the raw water is weakly acidic, which can effectively neutralize the ammonia released from the exhaust gas, eliminate the ammonia smell, recover ammonium sulfate, and avoid the consumption of a large amount of spray water. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the ammonium sulfate drying spray water replenishment system of this application;

[0016] Figure 2 This is a schematic diagram of the water-washing dust collector in this application. Detailed Implementation

[0017] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0018] Example 1

[0019] An ammonium sulfate drying spray water replenishment system includes: a belt conveyor 2, a drying bed body 3, a heat exchanger 12, a cyclone dust collector 4, a water washing dust collector 6, and an evaporation raw water tank 10. The belt conveyor 2 transports ammonium sulfate discharged from a centrifuge to the drying bed body 3. One end of the heat exchanger 12 is connected to a heat source steam 16, and the other end is connected to a condensate plug network 14. The heat exchanger 12 uses a blower 13 to input air for heat exchange to form hot air. After entering the drying bed body 3, the hot air passes through the cyclone dust collector 4 and then through the water washing dust collector 6 for secondary dust removal. The cyclone dust collector 4 and the drying bed body 3 are connected by a receiving hopper 11. The water washing dust collector 6 is connected to the evaporation raw water tank 10 through a pipe. The water washing dust collector 6 is connected to industrial water 7 through a pipe and valve. The bottom of the water washing dust collector 6 is connected to the spray device through a pipe and a drying circulation pump 8. The spray device is located in the upper part of the water washing dust collector 6.

[0020] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages:

[0021] The heat exchanger 12 is used to heat the air, forming hot air to dry the ammonium sulfate. The operation is convenient and quick. The resulting exhaust gas is discharged into the cyclone dust collector 4 to collect the generated dust. The dust-removed exhaust gas is then discharged into the water washing dust collector 6 for purification by spraying. This effectively eliminates the problem of dust particles and hot air dispersion in the exhaust gas. The treated exhaust gas is discharged from the top air outlet 601, which can effectively recover crystals in the exhaust gas and reduce particulate pollution caused by direct exhaust gas discharge. Example

[0022] An ammonium sulfate drying spray water replenishment system is disclosed. Hot air carries away free water and fine powder crystals from the crystals within the drying bed body 3 and enters a cyclone dust collector 4. The cyclone dust collector 4 is operated by a vibrating motor. An induced draft fan 5 introduces the hot air, after dust removal, into a water-washing dust collector 6. The hot air is introduced from the lower section of the water-washing dust collector 6. The ammonium sulfate in the drying bed body 3 and the dust in the cyclone dust collector 4 are periodically discharged into a receiving hopper 11. An evaporation water tank 10 uses a drying water pump 9 to transport liquid from its inlet 604 into the water-washing dust collector 6. The water-washing dust collector 6 discharges the liquid from its outlet 605 into the evaporation water tank 10 through a pipe. The inlet 604 is positioned higher than the outlet 605.

[0023] The other end of the pipe connected to the industrial water 7 is equipped with a spray device, the top of the water washing dust collector 6 is equipped with an air outlet 601, and the middle section of the water washing dust collector 6 is equipped with packing 603.

[0024] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages:

[0025] The liquid inside the water washing dust collector 6 flows into the evaporation raw water tank 10 through overflow. The liquid in the evaporation raw water tank 10 is pumped back into the water washing dust collector 6 by the drying water pump 9 to form a liquid circulation. When the liquid inside the water washing dust collector 6 is insufficient, industrial water 7 is connected, which can effectively reduce the water consumption of the system and improve the utilization rate of water resources.

[0026] By pumping liquid out from the water washing dust collector 6 for circulating spraying, the problem of introducing other water is effectively avoided, the amount of water evaporated from the system is reduced, and the raw water is weakly acidic, which can effectively neutralize the ammonia released from the exhaust gas, eliminate the ammonia smell, recover ammonium sulfate, and avoid the consumption of a large amount of spray water.

[0027] The packing material 603 installed in the middle section of the water washing dust collector can effectively increase the gas-liquid contact area and improve the water washing effect.

[0028] Working Principle: Ammonium sulfate fed from the centrifuge is conveyed to the drying bed body 3 via belt conveyor 2. Heat exchanger 12 exchanges heat with the air conveyed by blower 13. The hot air dries the wet ammonium sulfate. The hot air can carry away free water in the crystals. Together with the fine powder crystals, under the action of blower 13, the gas first passes through cyclone dust collector 4, and then through water washing dust collector 6 for secondary dust removal. The exhaust gas enters water washing dust collector 6, where the hot gas comes into counter-phase contact with the water washing spray liquid from bottom to top, effectively eliminating ammonia and dust and reducing particulate matter in the direct exhaust gas. Finally, the liquid phase overflows back to the raw water tank, and the recovered slurry continues to evaporate and crystallize. The vapor phase is led out through the air outlet 601 at the top of water washing dust collector 6, and finally meets the emission standards.

[0029] The spray system adopts raw material liquid absorption. The raw water tank 10 is pumped into the lower part of the water washing dust collector 6 through the drying water pump 9. The material liquid enters the top of the water washing dust collector 6 from bottom to top through the drying circulation pump 8. The tower is equipped with packing 603 to fully eliminate ammonia. The ammonium sulfate solution formed after acid-base neutralization overflows and is discharged to the evaporator to continue to participate in evaporation.

[0030] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0031] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. An ammonium sulfate drying spray water replenishment system, comprising: The system comprises a belt conveyor, a drying bed body, a heat exchanger, a cyclone dust collector, a water washing dust collector, and an evaporation raw water tank. The belt conveyor transports ammonium sulfate discharged from a centrifuge to the drying bed body. One end of the heat exchanger is connected to a heat source steam, and the other end is connected to a condensate pipe network. The heat exchanger uses a blower to input air for heat exchange, generating hot air. After entering the drying bed body, the hot air passes through the cyclone dust collector and then through the water washing dust collector for secondary dust removal. The cyclone dust collector and the drying bed body are connected by a receiving hopper. The water washing dust collector is connected to the evaporation raw water tank via a pipe. Industrial water is connected to the water washing dust collector via a pipe and valve. The bottom of the water washing dust collector, through a pipe and a drying circulation pump, introduces the internal liquid into a spray device. The spray device is located in the upper section inside the water washing dust collector.

2. The ammonium sulfate drying spray water replenishment system as described in claim 1, characterized in that, The hot air described above carries away the free water and fine powder crystals in the crystals within the drying bed and into the cyclone dust collector.

3. The ammonium sulfate drying spray water replenishment system as described in claim 1, characterized in that, The cyclone dust collector operates via a vibrating motor. The cyclone dust collector uses an induced draft fan to introduce the hot air after dust removal into the water washing dust collector. The hot air is introduced at the lower section of the water washing dust collector.

4. The ammonium sulfate drying spray water replenishment system as described in claim 1, characterized in that, The ammonium sulfate in the main body of the drying bed and the dust in the cyclone dust collector are periodically discharged into the receiving hopper.

5. The ammonium sulfate drying spray water replenishment system as described in claim 1, characterized in that, The evaporation raw water tank uses a drying water pump to transport the internal liquid from the inlet to the water washing dust collector. The water washing dust collector discharges the liquid inside the water washing dust collector from the outlet to the evaporation raw water tank through a pipeline. The position of the inlet is higher than that of the outlet.

6. The ammonium sulfate drying spray water replenishment system as described in claim 1, characterized in that, The other end of the industrial water connection pipe is equipped with a spray device, the top of the water washing dust collector is equipped with an air outlet, and the middle section of the water washing dust collector is equipped with packing material.

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