CN215196269U - Diammonium phosphate ammonia-fluorine-containing tail gas recovery and purification device - Google Patents
Diammonium phosphate ammonia-fluorine-containing tail gas recovery and purification device Download PDFInfo
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- CN215196269U CN215196269U CN202120579690.6U CN202120579690U CN215196269U CN 215196269 U CN215196269 U CN 215196269U CN 202120579690 U CN202120579690 U CN 202120579690U CN 215196269 U CN215196269 U CN 215196269U
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Abstract
A diammonium phosphate ammonia-fluorine-containing tail gas recovery and purification device comprises a primary treatment subsystem and a secondary treatment subsystem, wherein the primary treatment subsystem and the secondary treatment subsystem are sequentially connected; tail gas discharged by the granulating plate enters a secondary treatment subsystem through a primary treatment subsystem; tail gas discharged by the dry-making machine is mixed with gas discharged by the primary treatment subsystem and then enters the secondary treatment subsystem; the primary treatment subsystem comprises a venturi, a washing tower and a water washing tower, wherein the venturi, the washing tower and the water washing tower are sequentially connected; the secondary treatment subsystem comprises a circulating washing tower, a tube bundle dust remover, a wet high-voltage electrostatic dust remover, a fluorine washing tower and a chimney, wherein the circulating washing tower, the tube bundle dust remover, the wet high-voltage electrostatic dust remover, the fluorine washing tower and the chimney are sequentially connected; the water washing tower is connected with the circulating washing tower. The utility model has the advantages that, with granulator and desiccator exhaust tail gas in the processing of a system through different stages, reduced the burden of system, make clean system improve by a wide margin, reach the emission requirement.
Description
Technical Field
The utility model relates to a diammonium phosphate contains ammonia fluorine tail gas recovery purifier, specific be applied to diammonium phosphate's ammonia and fluorine tail gas treatment and contain ammonia, contain technology and device that fluorine water retrieved.
Background
The production of diammonium phosphate includes two technological processes of slurry process and traditional process, the production of concentrated phosphoric acid is called "traditional process" and the production of dilute phosphoric acid is called "slurry process". The slurry process is generally carried out by fast ammoniation and neutralization with external circulation combined with slurry-spraying granulation and drying. Characterized in that only one time of ammoniation, granulation and drying are needed to be carried out in the same kiln, and the requirement on acid quality is lower. The traditional method adopts tube reverse (or pre-neutralization) and a granulator to perform ammoniation twice and then perform drying. Characterized in that granulation and drying are respectively carried out in two kilns, the production load is high, and the product nutrient is high.
The conventional DAP production process mainly comprises the following steps: washing the tail gas of the granulator with concentrated phosphoric acid, introducing ammonia for neutralization, and then coating and granulating in the granulator. And (3) introducing ammonia for the second time in the granulator to accelerate the drying and forming of the particles, drying the formed particles by the dryer, screening, cooling, wrapping and packaging to obtain the finished product. The primary neutralization reaction is divided into a single-tube reverse mode, a double-tube reverse mode and a pre-neutralization tube-adding reverse mode. However, in any mode, the ammonia overflow amount in the granulating and drying processes is large, and the ammonia can be discharged only after being washed by tail gas. The current mainstream tail wash process comprises the following steps: the granulation tail gas is washed by a venturi and a granulation tail gas washer, and then is sent to a comprehensive tail gas washer by a granulator tail gas fan for washing and then is discharged; the dried tail gas is washed by a dried tail gas washer and then is sent to a comprehensive tail gas washer by a dried tail gas fan to be washed and then is discharged; and the cooling dust collection tail gas is directly discharged after being washed by a dust removal washer after most of dust is removed by a bag type dust collector. The comprehensive washer and the dust removal washer are washed by clean water, and the granulation tail gas washer and the drying tail gas washer are washed by concentrated phosphoric acid and dilute sulfuric acid. From the current industrial reaction situation, the ammonia content in tail gas is 300-400 mg/m3, the fluorine content is 8-9 mg/m3, and the dust content is 70-100 mg/m3, in order to meet the increasingly-stressed environmental-protection emission requirement, a more excellent solution is found by researching the washing condition of the existing diammonium phosphate tail washing section, the existing tail washing system of diammonium phosphate is improved, unreacted gas ammonia and dust in the tail gas are recovered, and the indexes of the treated tail gas meet the following requirements: the particle is less than 30mg/m 3; fluorine is less than 5mg/m 3; ammonia < 5mg/m 3.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a diammonium phosphate contains ammonia fluorine tail gas recovery purifier, with granulator and desiccator exhaust tail gas in a system through the processing in different stages, reduced the burden of system, make clean system improve by a wide margin simultaneously, reach the emission requirement.
The technical scheme for realizing the purpose of the utility model is that the diammonium phosphate ammonia-fluorine-containing tail gas recovery and purification device comprises a primary treatment subsystem and a secondary treatment subsystem, wherein the primary treatment subsystem is connected with the secondary treatment subsystem in sequence;
tail gas discharged by the granulating plate enters a secondary treatment subsystem through a primary treatment subsystem;
tail gas discharged by the dry-making machine is mixed with gas discharged by the primary treatment subsystem and then enters the secondary treatment subsystem;
the primary treatment subsystem comprises a venturi, a washing tower and a water washing tower, wherein the venturi, the washing tower and the water washing tower are sequentially connected;
the secondary treatment subsystem comprises a circulating washing tower, a tube bundle dust remover, a wet high-voltage electrostatic dust remover, a fluorine washing tower and a chimney, wherein the circulating washing tower, the tube bundle dust remover, the wet high-voltage electrostatic dust remover, the fluorine washing tower and the chimney are sequentially connected;
the water washing tower is connected with the circulating washing tower.
Further, the water washing tower is connected with the circulating washing tower through a cache box.
Further, the buffer box comprises a box body and an inner box, the inner box is arranged in the box body and is communicated with the interior of the box body through a hole in the surface, the exhaust gas of the washing tower is directly connected into the interior of the box body, and the exhaust tail gas of the dry-manufacturing machine is directly connected into the inner box and enters the box body through the hole in the surface of the inner box.
Furthermore, a liquid recovery tank is arranged at the bottom of the buffer tank and is connected with the buffer tank through an electric control discharge valve.
And furthermore, a discharge box is arranged in the box body and is connected with the circulating washing tower.
And further, tail gas discharged by the dry-cleaning machine passes through the dry-cleaning tower, is mixed with gas discharged by the primary treatment subsystem, and then enters the secondary treatment subsystem.
Further, the clean water supply system is connected with the fluorine washing tower, the water outlet of the fluorine washing tower is connected with the water inlet of the dry cleaning tower, and the water outlet of the water washing tower is connected with the water inlet of the washing tower.
The utility model is characterized in that:
1) the device has stable process, can effectively reduce the particulate matters in the tail gas by washing and absorbing ammonia and fluorine in the tail gas, and reaches the emission standard.
2) Can realize the gradual concentration and the cyclic utilization of the circulating water and the washing water, and achieve the purposes of energy conservation and emission reduction
3) After high-temperature tail gas discharged by the dry-making machine is discharged from the granulating plate and is mixed with the tail gas subjected to primary treatment, the temperature of mixed gas is increased, the humidity of the gas is reduced, and discharged water can be utilized for circulating washing to improve the operation effect of the whole system.
4) The treated tail gas particles are less than 30mg/m 3; fluorine is less than 5mg/m 3; ammonia < 5mg/m 3.
Drawings
The present invention will be further explained with reference to the accompanying drawings.
Fig. 1 is a schematic connection diagram of the present invention.
Fig. 2 is a schematic diagram of the preferred connection of the present invention.
Fig. 3 is a schematic diagram of a preferred structure of the cache box.
Fig. 4 is a schematic view of water recycling of the present invention.
As shown in the figure, the device comprises a 1-venturi tube, a 2-washing tower, a 3-water washing tower, a 4-dry cleaning tower, a 5-circulation washing tower, a 6-tube bundle deduster, a 7-wet high-voltage electrostatic deduster, an 8-fluorine washing tower, a 9-chimney, a 10-buffer tank, an 11-box body, a 12-inner tank, a 13-liquid recovery tank, a 14-electric control discharge valve and a 15-discharge tank.
Detailed Description
The following describes embodiments of the present invention with reference to the accompanying drawings.
As shown in fig. 1, a diammonium phosphate ammonia-fluorine-containing tail gas recovery and purification device comprises a primary treatment subsystem a and a secondary treatment subsystem B, wherein the primary treatment subsystem a and the secondary treatment subsystem B are sequentially connected;
tail gas discharged by the granulating plate enters a secondary treatment subsystem B through a primary treatment subsystem A;
mixing tail gas discharged by the dry manufacturing machine with gas discharged by the primary processing subsystem A and then entering a secondary processing subsystem B, preferably, enabling the tail gas discharged by the dry manufacturing machine to enter the secondary processing subsystem B through a dry cleaning tower 4, and omitting the dry cleaning tower 4 in the actual processing process, namely, whether the tail gas discharged by the dry manufacturing machine does not pass through the dry cleaning tower 4 or not enters the dry cleaning tower 4 to be adjusted according to corresponding parameters, generally speaking, according to the flow of the tail gas discharged by the dry manufacturing machine;
the primary treatment subsystem A comprises a venturi 1, a washing tower 2 and a water washing tower 3, wherein the venturi 1, the washing tower 2 and the water washing tower 3 are sequentially connected;
the secondary treatment subsystem B comprises a circulating washing tower 5, a tube bundle dust remover 6, a wet high-voltage electrostatic dust remover 7, a fluorine washing tower 8 and a chimney 9, wherein the circulating washing tower 5, the tube bundle dust remover 6, the wet high-voltage electrostatic dust remover 7, the fluorine washing tower 8 and the chimney 9 are sequentially connected;
the water washing tower 3 is connected with the circulating washing tower 5.
As shown in fig. 2, the water washing tower 3 and the circulation washing tower 5 are connected by a buffer tank 10.
As shown in fig. 3, the buffer tank 10 includes a tank 11 and an inner tank 12, the inner tank 12 is arranged in the tank 11, the inner tank 12 is communicated with the inside of the tank 11 through a hole on the surface, the gas discharged from the washing tower 3 is directly connected into the inside of the tank 11, the tail gas discharged from the dry-manufacturing machine is directly connected into the inner tank 12 and enters the tank 11 through the hole on the surface of the inner tank 12, a liquid recovery tank 13 is arranged at the bottom of the buffer tank 10, the liquid recovery tank 13 is connected with the buffer tank 10 through an electric control discharge valve 14, a discharge tank 15 is arranged in the tank 11, the discharge tank 15 is connected with the circulation washing tower 5, a plurality of layers of filter screens are arranged in the discharge tank 15, and the flow of the gas in the buffer tank 10 can be reduced by the filter screens.
As shown in fig. 4, the clean water supply system is connected with the fluorine washing tower 8 to replenish water to the fluorine washing tower 8, the water outlet of the fluorine washing tower 8 is connected with the water inlet of the dry cleaning tower 4, the water outlet of the water washing tower 4 is connected with the water inlet of the washing tower 2, and finally the water is replenished to the washing tower 2, so that the clean water is completely utilized.
The working principle is as follows: the tail gas of the granulator is washed by a venturi 1 and then enters a washing tower 2 for spraying and washing, and the venturi 1 and the washing tower 2 are both washed by concentrated phosphoric acid. The tail gas of the granulation enters a water washing tower 3 for further washing ammonia and dust after coming out of a manufacturing and washing tower 2, the tail gas discharged by a dry manufacturing machine enters a dry cleaning tower 4, the gas discharged by the dry cleaning tower 4 is mixed with the gas of the water washing tower 3 and then is connected with a large-flow circulating washing tower 5, an outlet of the circulating washing tower 5 is connected with a pipe bundle dust collector 6, and then enters a wet high-voltage electrostatic dust collector 7 for removing micro-foams and fine powder, and then enters a fluorine washing tower 8 for washing and emptying. Clean water is supplemented 8 from the fluorine washing tower, enters the dry cleaning tower 4, and is finally supplemented into the washing tower 2 for digestion after passing through the water washing tower 3. The large-flow circulation washing tower 5 adopts special circulating water for washing, and the water is repeatedly used after sedimentation and cooling, and the replacement water enters a system for use.
Set up buffer tank 10 and can make 3 exhaust gas of scrubbing tower and 4 exhaust gas intensive mixings of dry cleaning tower, 3 exhaust gas of scrubbing tower gets into in the box 11, 4 exhaust gas of dry cleaning tower get into in the inner box 12, and discharge through the hole on inner box 12 surface and get into in the box 11, 4 exhaust gas temperature of dry cleaning tower is high relatively, can make the inner box generate heat, its 3 exhaust gas of scrubbing tower makes wherein partial gas liquefaction after contacting with inner box 12 in the box 11, and get into liquid recovery case 13 through automatically controlled bleeder valve 14, liquid in the liquid recovery case 13 can be used for the washing of circulation scrubbing tower 5.
Claims (7)
1. The utility model provides a diammonium phosphate contains ammonia fluorine tail gas recovery purifier, characterized by: the recovery and purification device comprises a primary treatment subsystem and a secondary treatment subsystem, wherein the primary treatment subsystem is sequentially connected with the secondary treatment subsystem;
tail gas discharged by the granulating plate enters a secondary treatment subsystem through a primary treatment subsystem;
tail gas discharged by the dry-making machine is mixed with gas discharged by the primary treatment subsystem and then enters the secondary treatment subsystem;
the primary treatment subsystem comprises a venturi, a washing tower and a water washing tower, wherein the venturi, the washing tower and the water washing tower are sequentially connected;
the secondary treatment subsystem comprises a circulating washing tower, a tube bundle dust remover, a wet high-voltage electrostatic dust remover, a fluorine washing tower and a chimney, wherein the circulating washing tower, the tube bundle dust remover, the wet high-voltage electrostatic dust remover, the fluorine washing tower and the chimney are sequentially connected;
the water washing tower is connected with the circulating washing tower.
2. The recovery and purification device of diammonium phosphate ammonia-fluorine-containing tail gas as claimed in claim 1, which is characterized in that: the water washing tower is connected with the circulating washing tower through a buffer tank.
3. The recovery and purification device of diammonium phosphate ammonia-fluorine-containing tail gas, according to claim 2, is characterized in that: the buffer storage box comprises a box body and an inner box, the inner box is arranged in the box body and is communicated with the interior of the box body through a hole in the surface, the exhaust gas of the washing tower is directly connected into the interior of the box body, and the exhaust tail gas of the dry-manufacturing machine is directly connected into the inner box and enters the box body through the hole in the surface of the inner box.
4. The recovery and purification device of diammonium phosphate ammonia-fluorine-containing tail gas, according to claim 2, is characterized in that: the bottom of the buffer tank is provided with a liquid recovery tank which is connected with the buffer tank through an electric control discharge valve.
5. The recovery and purification device of diammonium phosphate ammonia-fluorine-containing tail gas, according to claim 3, is characterized in that: and a discharge box is arranged in the box body and is connected with the circulating washing tower.
6. The recovery and purification device of diammonium phosphate ammonia-fluorine-containing tail gas as claimed in claim 1, which is characterized in that: and tail gas discharged by the dry-cleaning machine passes through the dry-cleaning tower and is mixed with gas discharged by the primary treatment subsystem, and then enters the secondary treatment subsystem.
7. The recovery and purification device of diammonium phosphate ammonia-fluorine-containing tail gas, according to claim 6, is characterized in that: the clean water supply system is connected with the fluorine washing tower, the water outlet of the fluorine washing tower is connected with the water inlet of the dry cleaning tower, and the water outlet of the water washing tower is connected with the water inlet of the washing tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120579690.6U CN215196269U (en) | 2021-03-22 | 2021-03-22 | Diammonium phosphate ammonia-fluorine-containing tail gas recovery and purification device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120579690.6U CN215196269U (en) | 2021-03-22 | 2021-03-22 | Diammonium phosphate ammonia-fluorine-containing tail gas recovery and purification device |
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| Publication Number | Publication Date |
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| CN215196269U true CN215196269U (en) | 2021-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120579690.6U Active CN215196269U (en) | 2021-03-22 | 2021-03-22 | Diammonium phosphate ammonia-fluorine-containing tail gas recovery and purification device |
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| CN (1) | CN215196269U (en) |
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2021
- 2021-03-22 CN CN202120579690.6U patent/CN215196269U/en active Active
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