CN216987035U - A purifier for handling dry tail gas of ammonium chloride - Google Patents
A purifier for handling dry tail gas of ammonium chloride Download PDFInfo
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- CN216987035U CN216987035U CN202122979304.5U CN202122979304U CN216987035U CN 216987035 U CN216987035 U CN 216987035U CN 202122979304 U CN202122979304 U CN 202122979304U CN 216987035 U CN216987035 U CN 216987035U
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Abstract
The utility model provides a purification device for treating ammonium chloride drying tail gas, which is an integral purification tower, wherein the purification tower comprises a first washing section, a gas cooling section and a second washing section from bottom to top. The purification device is used for removing ammonium chloride dust and malodorous pollutants (ammonia) in tail gas discharged by the ammonium chloride drying equipment. The purification device provided by the utility model has the advantages of small occupied area, short process flow and no influence on the tail gas treatment of the original production flow.
Description
Technical Field
The utility model provides a purification device for treating ammonium chloride dry tail gas, and relates to the technical field of tail gas purification treatment of a combined alkali method in the soda industry.
Background
With the gradual improvement of national environmental protection policy and regulation and the full promotion of the emission standard of pollutants in the soda industry, soda production enterprises must perform full upgrading and reconstruction on the treatment of pollutants. Wherein, the maximum allowable emission concentration of particulate matters in the air pollutant discharge Standard and the emission concentration and the emission rate of ammonia in the malodorous pollutant discharge Standard are environmental protection indexes which have great influence on the process (ammonium chloride production) of the combined alkali method II.
In the existing dry ammonium production process, tail gas of ammonium chloride drying equipment is treated by a cyclone separator and a bag-type dust collector, and is directly emptied after being simply washed by water. The existing process flow and equipment can not meet the index requirements of particulate matter emission concentration, odor pollutant ammonia emission concentration, exhaust funnel height and the like.
As equipment arrangement of production enterprises and technological processes are mature, a solution which occupies a small area, is short in technological process and does not influence the tail gas treatment of the original production process is urgently needed.
The utility model CN 211274164U discloses an ammonia-containing tail gas purification device at the dry ammonium workshop section in the alkali industry, which comprises an ammonia desulphurization device and an ammonia-containing tail gas dust removal and absorption device for the dry ammonium in the alkali industry; the ammonia desulphurization device is connected with the dust removal and absorption device for the ammonia-containing tail gas of the combined-soda dry ammonium. The ammonia desulphurization device comprises a desulphurization tower, an oxidation tank, a flue gas absorption circulating pump, a concentration circulating pump and an ammonium sulfate centrifuge; the desulfurization tower is connected with an ammonium sulfate centrifugal machine through a concentration circulating pump, the desulfurization tower forms a circulating connection with an oxidation tank through a flue gas absorption circulating pump, and ammonium sulfate filtrate is connected with an ammonia tail gas absorption tower. The process flow is complex, various devices are newly added, and the occupied area is large. And the absorption liquid selected for use by the utility model is a byproduct of the ammonia desulphurization device, and can not be applied to some united alkali factories without a cogeneration device, and lacks wide applicability.
The utility model CN 209093081U discloses an ammonia-containing tail gas purification device for soda ash production, the device comprises an ammonia purification tower for ammonia-containing tail gas, wherein the ammonia purification tower for ammonia-containing tail gas is provided with an ammonia-containing tail gas inlet, a carbon dioxide gas inlet, a washing liquid outlet and a tail gas purification outlet, the ammonia-containing tail gas inlet and the washing liquid outlet are positioned at the lower part of the ammonia purification tower for ammonia-containing tail gas, the washing liquid inlet is arranged at the upper part of the tower body corresponding to the washing section, the purified tail gas outlet is arranged at the top of the ammonia purification tower for the tail gas containing ammonia, the upper part of the ammonia purification tower for the tail gas containing ammonia is provided with an external washing water circulating cooling mechanism, the utility model discloses a do not set up "gas cooling section", when dry ammonium tail gas temperature is higher, simply through increasing the washing section height, increasing the washing water circulation volume, increasing modes such as acid auxiliary agent, it is unable further improvement NH.3The removal rate is high.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a purification device for treating ammonium chloride dry tail gas, aiming at the problems of complex process flow, large equipment volume and high cost in the prior art.
The purification device is an integral purification tower which comprises a first washing section, a gas cooling section and a second washing section from bottom to top.
The integral purification tower has small influence on the original device, needs less equipment, occupies small area, has no complex process flow, can be installed in a prying block mode in practice, and is 'plug and play'.
Said first scrubbing stage comprising CO2A gas distribution device, a dry ammonium tail gas inlet, a fresh water inlet, a circulating washing water communicating pipe, and CO2The gas distribution device is communicated with the bottom of the first washing section, and the dry ammonium tail gas inlet is arranged at the CO2Gas distribution device top, the fresh water import sets up in first washing section top, circulation wash water communicating pipe one end communicates in first washing section top, and the other end communicates in first washing section bottom, circulation wash water communicating pipe is used for washing firstThe washing water at the bottom of the washing section is circulated to the top of the first washing section.
The circulating washing water is recycled by the equipment and is discharged to the miscellaneous water bucket after reaching saturation.
Said CO2The gas distribution means comprises CO2A gas inlet and a gas distributor. The gas distributor comprises a plurality of layers of circular pipes, and each layer of circular pipe is provided with a plurality of spray head devices which are connected in an end-to-end mode.
Optionally, the spray head device is one of a rotary spray head, a water-dispersing spray head, a diffusion spray head and a pulse spray head.
CO2Can be directly introduced into the washing water through the gas distributor to remove NH3Cl dust and NH3，CO2The use of the gas distributor can improve the absorption rate of the washing water and reduce the consumption of fresh water.
Furthermore, a pipeline pump and an ammonium-containing washing water discharge port are arranged on the circulating washing water communicating pipe.
Optionally, a liquid distributor is arranged below the fresh water inlet and/or the circulating wash water communicating pipe.
Optionally, a filling material level is arranged above the dry ammonium tail gas inlet.
Containing CO2The washing water is recycled, is uniformly distributed by the liquid distributor and then is contacted with the dry ammonium tail gas in the filling position, so that the particulate matters and NH in the tail gas3Dissolved in the wash water, and when the wash water concentration reaches saturation, part of the wash water is drained through an ammonium-containing wash water drain and part of the fresh water is replenished.
The gas cooling section comprises a circulating cooling water inlet, a circulating cooling water outlet and a condensing device, wherein a first tail gas communicating pipe and a second tail gas communicating pipe are connected to two sides of the outside of the gas cooling section; the tail gas is used for conveying the dry ammonium tail gas of the first washing section to a condensing device; the lower end of the first tail gas communicating pipe is communicated with the condensing device, and the upper end of the first tail gas communicating pipe is communicated with the bottom of the second washing section and used for conveying the condensed dry ammonium tail gas to the second washing section.
Further, the condensing device comprises a radiator and a pipe condensate discharge port connected to the bottom end of the radiator.
The radiator can be a plate radiator or a shell-and-tube radiator, and the shell-and-tube radiator can be a fin tube radiator, a heat tube radiator or a sleeve tube radiator, and is preferably a fin tube radiator.
Generally, the temperature of the dry ammonium tail gas is 65-80 ℃, the dry ammonium tail gas is limited by the temperature, and NH is generated after the first washing3The washing of (2) has not been improved by increasing the water absorption capacity. The gas cooling section adopts a shell-and-tube or plate-type radiator structure, so that the side heat transfer efficiency of gas is increased, and the temperature of the gas is reduced to 40-45 ℃. The gas temperature decreases and NH increases3Solubility in the second-stage wash water, with partial NH3The condensate is discharged from a condensate discharge port at the bottom of the shell pass along with the condensate.
The top of the second washing section is provided with a tail gas discharge port, the upper part of the second washing section is provided with a fresh washing water inlet, and the bottom of the second washing section is provided with an ammonia-containing washing water outlet.
Optionally, a liquid distributor is arranged below the fresh washing water inlet.
Optionally, a filling position is arranged above the first tail gas communicating pipe.
Optionally, a wire mesh demister is arranged between the tail gas discharge port and the fresh washing water inlet.
The washing water of the second washing section is fresh water, is uniformly distributed by a liquid distributor and is contacted with the cooled dry ammonium tail gas in a packing position, and NH in the tail gas is further removed3. The washing water after washing can be recycled to other working sections.
Advantageous effects
The purification device adopts integrated modular equipment on the premise of not influencing the original main process flow, namely a gas cooling section is arranged between two washing sections, a carbon dioxide inlet is arranged at the bottom of a first washing section, and CO2By gas distributors directlyThe washing water is introduced, so that the washing water can better reach the expected acidity and is beneficial to NH3Removal of (2), better realization of NH3Cl dust removal, NH3The environmental protection standard requirement of deodorization.
The purification device has small influence on the original device, needs less equipment, occupies small area, has no complex process flow, can be practically installed in a prying block manner, and is plug and play. The absorption liquid is water and carbon dioxide, and is a common public engineering product for the combined alkali production enterprises.
Drawings
FIG. 1 is a schematic structural view of a purification apparatus for treating ammonium chloride dry tail gas according to the present invention
FIG. 2 is a schematic view of a carbon dioxide gas distributor
FIG. 3 is a front view of a carbon dioxide gas distributor
FIG. 4 is an enlarged view of the connection between the connection pipe and the threaded pipe
FIG. 5 is a schematic view of the nozzle structure
In the figure: a-a first washing stage; b-a gas cooling section; c-a second washing stage; 1-CO2A gas distributor; 2-a carbon dioxide gas inlet; 3-dry ammonium tail gas inlet; (4-1) -a first fill level; (4-2) -a second fill level; (5-1) -a first liquid distributor; (5-2) -a second liquid distributor; 6-fresh water inlet; 7-circulating cooling water inlet; 8-condensate discharge port; 9-a radiator; (10-1) -a first tail gas communicating tube; 11-wire mesh demister; 12-exhaust gas discharge port; 13-fresh wash water inlet; 14-circulating cooling water outlet; 15-an ammonia-containing wash water outlet; (10-2) a second exhaust gas communicating pipe; 17-circulating washing water communicating pipe; 18-a pipeline pump; 19-discharge of ammonium-containing wash water; h-connection pipe; i-a local enlarged connection of the connecting pipe and the threaded pipe; g-nozzle device
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1: fig. 1 is a schematic structural diagram of a purification apparatus for treating ammonium chloride dry tail gas according to the present invention.
The purification device is an integral purification tower which comprises a first washing section A, a gas cooling section B and a second washing section C from bottom to top. Said first scrubbing section A comprising CO2A gas distribution device, a dry ammonium tail gas inlet 3, a fresh water inlet 6 and a circulating washing water communicating pipe 17, wherein the CO is2The gas distribution device is communicated with the bottom of the first washing section A, and a dry ammonium tail gas inlet 3 is arranged on the CO2Above the gas distribution device, the fresh water inlet 6 is arranged at the top of the first washing section a, one end of the circulating washing water communicating pipe 17 is communicated with the top of the first washing section a, the other end is communicated with the bottom of the first washing section a, and the circulating washing water communicating pipe 17 is used for circulating the washing water at the bottom of the first washing section a to the top of the first washing section a. The circulating washing water communicating pipe 17 is provided with a pipeline pump 18 and an ammonium-containing washing water discharge port 19.
Optionally, a first liquid distributor 5-1 is arranged below the fresh water inlet 6.
Optionally, a first filling material 4-1 is arranged above the dry ammonium tail gas inlet 3.
The gas cooling section B comprises a circulating cooling water inlet 7, a circulating cooling water outlet 14 and a condensing device, wherein a first tail gas communicating pipe 10-1 and a second tail gas communicating pipe 10-2 are connected to two sides of the outside of the gas cooling section B, the circulating cooling water inlet 7 is arranged at the bottom of the gas cooling section B, the circulating cooling water outlet 14 is arranged at the top of the gas cooling section B, the lower end of the second tail gas communicating pipe 10-2 is communicated with the top of the first washing section A, and the upper end of the second tail gas communicating pipe is communicated with the condensing device and is used for conveying the dry ammonium tail gas of the first washing section A to the condensing device; the lower end of the first tail gas communicating pipe 10-1 is communicated with the condensing device, and the upper end is communicated with the bottom of the second washing section C and used for conveying the condensed dry ammonium tail gas to the second washing section C. The condensing device comprises a radiator 9 and a pipe condensate discharge port 8, and the bottom end of the radiator is communicated with the pipe condensate discharge port 8.
Optionally, the radiator 9 is a finned tube radiator in a shell-and-tube radiator.
And a tail gas discharge port 12 is arranged at the top of the second washing section C, a fresh washing water inlet 13 is arranged at the upper part of the second washing section C, and an ammonia-containing washing water outlet 15 is arranged at the bottom of the second washing section C.
Optionally, a second liquid distributor 5-2 is arranged below the fresh washing water inlet 13 of the second washing stage C.
Optionally, a second filling position 4-2 is arranged above the first tail gas communicating pipe 10-1.
Optionally, a wire mesh demister 11 is arranged between the tail gas discharge outlet 12 at the top of the second washing section C and the fresh washing water inlet 13.
The design height of the tail gas purification device in the practical application is 20m-25 m.
Example 2: FIG. 2-FIG. 5 show a CO according to the present invention2The structure, front view and partial internal components of the gas distribution device are schematically illustrated, and on the basis of the embodiment 1, CO is treated by combining the attached figures 2-52A gas distribution apparatus is described.
Said CO2The gas distribution means comprises CO2A gas inlet 2 and a gas distributor 1. The gas distributor 1 comprises two layers of ring pipes, the inner layer of each spray head device is provided with 14, the outer layer of each spray head device is provided with 24, the spray head devices are connected in a head-to-head mode, and each spray head device G is formed by connecting a connecting pipe H and a threaded pipe.
Optionally, the spray head device G is a diffusion spray head.
Example 3: the process of the present invention will be described in detail with reference to the structure of the exhaust gas purifying apparatus described in example 1.
In the first stage of the scrubbing process, CO is introduced via the gas distributor 12Enhanced removal of NH3Cl dust, and NH3The washing effect of (1). Fresh water is introduced through fresh water inlet 6, and the fresh water is uniformly distributed through first liquid distributor 5-1 and contains CO2The washing water is circulated through the circulating washing water communicating pipe 17Circularly using, uniformly distributing by a first liquid distributor 5-1, introducing dry ammonium tail gas, and contacting with each other at a first filling position 4-1 to make particulate matters and NH in the tail gas3Dissolved in the wash water and when the wash water concentration reaches saturation, part of the wash water is discharged through the ammoniated wash water outlet 15 and part of the fresh water is replenished. High efficiency CO2The use of the gas distributor can improve the absorption rate of the washing water and reduce the consumption of fresh water.
After the first washing, the residual tail gas upwards enters a gas cooling section B through a tail gas communicating pipe 10-2, the gas cooling section adopts a shell-and-tube or plate type radiator structure to increase the gas side heat transfer efficiency, cold water enters through a circulating cooling water inlet 7 to reduce the gas temperature, and part of NH after the gas temperature is reduced 3Cold water will flow out through the recirculating cooling water outlet 14 as the condensate drains from the condensate drain at the bottom. At this time, the cooled residual dry ammonium tail gas can enter the second washing section C upwards through the tail gas communicating pipe 10-1.
The washing water of the second washing section C is fresh water, is uniformly distributed by a second liquid distributor 5-2 and then is contacted with the cooled dry ammonium tail gas in a second filling position 4-2, and further NH in the tail gas is removed3The washing water for washing the dry ammonium tail gas for the second time flows out through the ammonia-containing washing water outlet 15, the washing water after washing can be recycled, and the dry ammonium tail gas after washing for the second time is filtered through the wire mesh demister 11 again and then is discharged from the tail gas discharge port 12.
Example 4: the effect of the use of the exhaust gas purification device according to the present invention will be described below with reference to specific data on the basis of example 1.
The concentration of the gas outlet emission of the tail gas purification device can be controlled to be NH3Cl dust particles are less than or equal to 2mg/m3(ii) a Malodorous pollution (NH)3)≤45mg/m3。
The utility model being thus described by way of example, it should be understood that any simple alterations, modifications or other equivalent alterations as would be within the skill of the art without the exercise of inventive faculty, are within the scope of the utility model.
Claims (13)
1. The purification device for treating the ammonium chloride dry tail gas is characterized by being an integral purification tower, wherein the purification tower comprises a first washing section (A), a gas cooling section (B) and a second washing section (C) from bottom to top.
2. The purification installation for the treatment of ammonium chloride dry tail gas according to claim 1, characterized in that said first washing section (A) comprises CO2A gas distribution device, a dry ammonium tail gas inlet (3), a fresh water inlet (6) and a circulating wash water communicating pipe (17), wherein the CO is2The gas distribution device is communicated with the bottom of the first washing section (A), and the dry ammonium tail gas inlet (3) is arranged on the CO2The gas distribution device top, fresh water import (6) set up in first washing section top, circulation wash water communicating pipe (17) one end communicates in first washing section (A) top, and the other end communicates in first washing section (A) bottom, circulation wash water communicating pipe (17) are used for circulating first washing section (A) bottom wash water to first washing section (A) top.
3. The purification plant for treating ammonium chloride dry tail gas according to claim 2, wherein the CO is CO2The gas distribution means comprises CO2The gas distributor (1) comprises a plurality of layers of circular pipes, and a plurality of spray head devices (G) which are connected in an end-to-end mode are arranged on each layer of circular pipe.
4. The purification device for processing ammonium chloride dry tail gas according to claim 3, wherein the spray head device (G) is one of a rotary spray head, a water dispersion spray head, a diffusion spray head and a pulse spray head.
5. The purification device for treating ammonium chloride dry tail gas according to claim 1, wherein the gas cooling section (B) comprises a circulating cooling water inlet (7), a circulating cooling water outlet (14) and a condensing device, the first tail gas communicating pipe (10-1) and the second tail gas communicating pipe (10-2) are connected to two external sides of the gas cooling section (B), the circulating cooling water inlet (7) is arranged at the bottom of the gas cooling section (B), the circulating cooling water outlet (14) is arranged at the top of the gas cooling section (B), the lower end of the second tail gas communicating pipe (10-2) is communicated with the top of the first washing section (A), and the upper end of the second tail gas communicating pipe is communicated with the condensing device and is used for conveying the dry ammonium tail gas of the first washing section (A) to the condensing device; the lower end of the first tail gas communicating pipe (10-1) is communicated with the condensing device, and the upper end of the first tail gas communicating pipe is communicated with the bottom of the second washing section (C) and used for conveying the condensed dry ammonium tail gas to the second washing section (C).
6. The purification device for processing ammonium chloride dry tail gas according to claim 5, characterized in that, the condensing device comprises a radiator (9) and a pipe condensate discharge port (8) connected with the bottom end of the radiator.
7. The purification device for treating ammonium chloride dry tail gas according to claim 6, characterized in that the radiator (9) is a plate radiator or a shell-and-tube radiator.
8. The purification device for treating ammonium chloride dry tail gas according to claim 7, characterized in that the radiator (9) is a shell-and-tube radiator.
9. The purification device for treating ammonium chloride dry tail gas according to claim 1, wherein the second washing section (C) is provided with a tail gas discharge outlet (12) at the top, a fresh washing water inlet (13) at the upper part and an ammonia-containing washing water outlet (15) at the bottom.
10. The purification device for treating ammonium chloride dry tail gas according to claim 1, characterized in that a wire mesh demister (11) is arranged between the tail gas exhaust outlet (12) at the top of the second washing section (C) and the fresh washing water inlet (13).
11. The purification device for treating ammonium chloride dry tail gas according to claim 2, characterized in that a liquid distributor is arranged below the fresh water inlet (6); a filling material position is arranged above the dry ammonium tail gas inlet (3).
12. The purification device for treating ammonium chloride dry tail gas as claimed in claim 5, wherein a filling material is arranged above the first tail gas communicating pipe (10-1).
13. The purification device for treating ammonium chloride dry tail gas according to claim 9, characterized in that a liquid distributor is arranged below the fresh wash water inlet (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122979304.5U CN216987035U (en) | 2021-11-30 | 2021-11-30 | A purifier for handling dry tail gas of ammonium chloride |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122979304.5U CN216987035U (en) | 2021-11-30 | 2021-11-30 | A purifier for handling dry tail gas of ammonium chloride |
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| Publication Number | Publication Date |
|---|---|
| CN216987035U true CN216987035U (en) | 2022-07-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122979304.5U Active CN216987035U (en) | 2021-11-30 | 2021-11-30 | A purifier for handling dry tail gas of ammonium chloride |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216987035U (en) |
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2021
- 2021-11-30 CN CN202122979304.5U patent/CN216987035U/en active Active
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