CN210473560U

CN210473560U - Device for preventing ammonia escape in denitration

Info

Publication number: CN210473560U
Application number: CN201920903437.4U
Authority: CN
Inventors: 李威; 王真真
Original assignee: Changsha Environmental Protection College
Current assignee: Changsha Environmental Protection College
Priority date: 2019-06-17
Filing date: 2019-06-17
Publication date: 2020-05-08
Anticipated expiration: 2029-06-17

Abstract

The utility model relates to the technical field of flue gas denitration, and discloses a device for preventing ammonia escape in denitration, which comprises a reaction chamber, a nitrogen oxide gas inlet, an ammonia inlet, a dissolution crystallization chamber and a discharge port; the distilled water import has been seted up on the top right side of reacting chamber, the bottom intercommunication of distilled water import has the force (forcing) pump, the downside output intercommunication of force (forcing) pump has the vapor spout that is disc structure, reacting chamber right side wall lower part is provided with the control box, the right-hand member middle part of reacting chamber has the dissolution crystallization chamber through the connecting pipe intercommunication, the right side lower part of dissolution crystallization chamber is provided with the discharge gate, be provided with the cold air chamber in the inner wall of dissolution crystallization chamber, the top intercommunication in upside cold air chamber has the cold air duct, the end of cold air duct is provided with the refrigerator, be provided with the valve on the cold air duct, be provided with the atmospheric pressure detector in the inner wall of dissolution crystallization chamber. The utility model has the advantages that: prevent gases such as ammonia from leaking, and the work efficiency is high.

Description

Device for preventing ammonia escape in denitration

Technical Field

The utility model relates to a flue gas denitration technical field specifically is a device that is arranged in denitration to prevent ammonia escape.

Background

China is a country which takes coal as main energy, and accounts for about 74% of the total primary energy output of the country, and the coal thermal power generation still dominates the power generation field of China for a long time, while the main pollutants discharged by coal combustion are: SO (SO)₂Hydrocarbons, aldehydes, solid particulates, and the like, wherein SO₂And NO are the most major atmospheric pollutants and are also the major contributors to acid rain.

A flue gas wet denitration device disclosed in Chinese patent (publication number: CN 208482234U, publication date: 2019.02.12) is characterized in that a flue gas outlet is formed in one side of the top of a spray tower; an inlet flue is arranged on one side of the middle lower part of the spray tower, a process water nozzle is arranged at the top of the inlet flue, and ozone nozzles are arranged on two sides in the inlet flue; a first spraying layer, a second spraying layer and a demister are sequentially arranged above the middle inside the spraying tower; a slurry pool is arranged at the bottom of the spray tower and is respectively connected to the first spray layer and the second spray layer through a first solution circulating pump and a second solution circulating pump which are positioned outside the spray tower; and an ammonia water delivery pump is arranged outside the spray tower, and ammonia water is delivered into the spray tower through the ammonia water delivery pump. The utility model discloses an adopt nitrogen oxide in ozone oxidation, the absorptive method desorption flue gas of aqueous ammonia, denitration efficiency is more than 85%, can reduce investment and working costs, improves purification efficiency, does not have any secondary pollution. However, gases such as ammonia gas existing in the device are easy to leak, pollute air and harm the safety of workers.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a device that is arranged in denitration to prevent ammonia escape to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the device for preventing ammonia from escaping in denitration comprises a reaction chamber, a nitrogen oxide gas inlet, an ammonia inlet, a dissolution crystallization chamber and a discharge hole; the nitrogen oxide gas inlet communicates in the middle of the left side wall of the reaction chamber, the ammonia inlet communicates in the lower part of the left side wall of the reaction chamber, the distilled water inlet has been seted up on the top right side of the reaction chamber, the bottom of the distilled water inlet communicates with the booster pump, the downside output of the booster pump communicates with the steam spout that is disc-shaped structure, and the distilled water in the distilled water inlet can flow downwards through the steam spout with the mode of steam through the booster pump. Inputting ammonia into the reaction chamber through an ammonia inlet, inputting nitric oxide gas into the reaction chamber through a nitric oxide gas inlet, and then carrying out complete gas phase reaction on the ammonia, the nitric oxide gas and water vapor to generate ammonium nitrate white smoke. The lower part of the right side wall of the reaction chamber is provided with a control box, and the middle part of the right end of the reaction chamber is communicated with a dissolution crystallization chamber through a connecting pipe.

Alkaline solution is stored in the dissolving and crystallizing chamber, a discharge hole is formed in the lower portion of the right side of the dissolving and crystallizing chamber, and the ammonium nitrate white smoke gas is input into the dissolving and crystallizing chamber through a connecting pipe and is mixed with the alkaline solution in the dissolving and crystallizing chamber, so that ammonia gas in the ammonium nitrate white smoke is rapidly dissolved in the alkaline solution, and leakage is prevented. The inner wall of the dissolution crystallization chamber is provided with a cold air chamber, the top of the upper cold air chamber is communicated with a cold air pipe, the tail end of the cold air pipe is provided with a refrigerator, the cold air pipe is provided with a valve, and the valve is used for controlling the flow of cold air in the cold air pipe. The refrigerator is started to generate cold air which is input into the cold air cavity, so that the temperature inside the dissolution crystallization chamber is reduced, and the dissolution speed of the ammonium nitrate white smoke and the alkaline solution is improved. Be provided with the atmospheric pressure detector in dissolving the inner wall of crystallization chamber, atmospheric pressure detector and control box electric connection are provided with the vacuum pump on dissolving the right side wall of crystallization chamber, reduce the inside atmospheric pressure of dissolving the crystallization chamber through the vacuum pump, then stop when the detection through the atmospheric pressure detector reaches suitable pressure, be convenient for alkaline solution through reducing the inside atmospheric pressure of dissolving the crystallization chamber after circulating with ammonium nitrate white smoke many times, will contain the concentrated crystallization of solution of nitrate and nitrite to stop probably there being the danger of gas escape.

As a further aspect of the present invention: the inner bottom of the reaction chamber is provided with an arc-shaped bottom plate, and the arrangement of the arc-shaped bottom plate is convenient for the gas in the reaction chamber to fully react in a flowing mode.

As a further aspect of the present invention: the bottom one side of connecting pipe is provided with the fan, and fan and control box electric connection can be inputed the inside ammonium nitrate white smog that produces of reaction chamber into the connecting pipe through the fan. The middle part of the connecting pipe is provided with a one-way valve which is used for preventing the ammonium nitrate white smoke gas in the connecting pipe from flowing backwards.

As a further aspect of the present invention: the connecting pipe and the junction of reaction chamber and dissolution crystallization chamber all are provided with the sealing washer, and the setting of sealing washer prevents that gas from taking place to leak at the flow in-process in the connecting pipe.

As a further aspect of the present invention: the inside of reacting chamber is provided with vertical (mixing) shaft, and the bottom of (mixing) shaft is rotated and is connected with the motor, and motor and control box electric connection drive the (mixing) shaft through the starter motor and rotate, and then accelerate the inside ammonia of reacting chamber and nitrogen oxide gas and vapor to carry out complete gas phase reaction, and then improve the efficiency of work.

Compared with the prior art, the beneficial effects of the utility model are that: the air pressure in the dissolving and crystallizing chamber is reduced by a vacuum pump, and then the dissolving and crystallizing chamber is stopped when reaching a proper pressure through the detection of an air pressure detector, so that the solution containing nitrate and nitrite is concentrated and crystallized after the alkaline solution is circulated with the ammonium nitrate white smoke for multiple times through reducing the air pressure in the dissolving and crystallizing chamber, and the possible danger of gas escape is avoided; the refrigerator is started to generate cold air which is input into the cold air cavity, so that the temperature inside the dissolution crystallization chamber is reduced, and the dissolution speed of the ammonium nitrate white smoke and the alkaline solution is improved. The utility model has the advantages that: prevent gas such as ammonia from leaking, work efficiency is high.

Drawings

FIG. 1 is a schematic structural diagram of a first embodiment of an apparatus for preventing ammonia slip in denitration.

Fig. 2 is a schematic structural view of a connection pipe in an apparatus for preventing ammonia slip in denitration.

FIG. 3 is a schematic structural diagram of a second embodiment of an apparatus for preventing ammonia slip in denitration.

Wherein: the device comprises a reaction chamber 10, a nitrogen oxide gas inlet 11, an ammonia inlet 12, a distilled water inlet 13, a pressure pump 14, a steam nozzle 15, an arc-shaped bottom plate 16, a control box 17, a connecting pipe 18, a fan 19, a one-way valve 20, a dissolution crystallization chamber 21, a refrigerator 22, a valve 23, a cold air pipe 24, a cold air cavity 25, a discharge hole 26, a vacuum pump 27, an air pressure detector 28, a sealing ring 29, a motor 30 and a stirring shaft 31.

Detailed Description

The technical solution of the present patent will be described in further detail with reference to the following embodiments.

Example one

Referring to fig. 1-2, the apparatus for preventing ammonia escape in denitration includes a reaction chamber 10, a nitrogen oxide gas inlet 11, an ammonia inlet 12, a dissolution crystallization chamber 21, and a discharge port 26; the nitric oxide gas inlet 11 is communicated with the middle part of the left side wall of the reaction chamber 10, the ammonia inlet 12 is communicated with the lower part of the left side wall of the reaction chamber 10, the distilled water inlet 13 is formed in the right side of the top of the reaction chamber 10, the bottom end of the distilled water inlet 13 is communicated with the pressure pump 14, the output end of the lower side of the pressure pump 14 is communicated with the water vapor nozzle 15 in a disc-shaped structure, and distilled water in the distilled water inlet 13 can flow downwards in a water vapor mode through the water vapor nozzle 15 through the pressure pump 14. Ammonia is fed into the interior of the reaction chamber 10 through an ammonia inlet 12, nitrogen oxide gas is fed into the interior of the reaction chamber 10 through a nitrogen oxide gas inlet 11, and then the ammonia undergoes a complete gas phase reaction with the nitrogen oxide gas and water vapor to produce ammonium nitrate white smoke. The inner bottom of the reaction chamber 10 is provided with an arc-shaped bottom plate 16, and the arc-shaped bottom plate 16 is arranged to facilitate the gas inside the reaction chamber 10 to fully react in a flowing manner. The lower part of the right side wall of the reaction chamber 10 is provided with a control box 17, the middle part of the right end of the reaction chamber 10 is communicated with a dissolution crystallization chamber 21 through a connecting pipe 18, the connecting parts of the connecting pipe 18, the reaction chamber 10 and the dissolution crystallization chamber 21 are provided with sealing rings 29, and the arrangement of the sealing rings 29 prevents gas in the connecting pipe 18 from leaking in the flowing process. A fan 19 is arranged on one side of the bottom of the connecting pipe 18, the fan 19 is electrically connected with the control box 17, and the ammonium nitrate white smoke generated in the reaction chamber 10 can be input into the connecting pipe 18 through the fan 19. The middle part of the connecting pipe 18 is provided with a one-way valve 20, and the one-way valve 20 is arranged for preventing the ammonium nitrate white smoke gas in the connecting pipe 18 from flowing backwards.

The inside of the dissolution crystallization chamber 21 is stored with alkaline solution, the lower part of the right side of the dissolution crystallization chamber 21 is provided with a discharge hole 26, and the ammonium nitrate white smoke gas is input into the dissolution crystallization chamber 21 through the connecting pipe 18 and mixed with the alkaline solution in the dissolution crystallization chamber 21, so that the ammonia gas in the ammonium nitrate white smoke is rapidly dissolved in the alkaline solution, and the leakage is prevented. The inner wall of the dissolution crystallization chamber 21 is provided with a cold air chamber 25, the top of the upper cold air chamber 25 is communicated with a cold air pipe 24, the tail end of the cold air pipe 24 is provided with a refrigerator 22, the cold air pipe 24 is provided with a valve 23, and the valve 23 is arranged for controlling the flow of cold air in the cold air pipe 24. The refrigerator 22 is started to generate cold air which is then input into the cold air cavity 25, so that the temperature inside the dissolution crystallization chamber 21 is reduced, and the dissolution speed of the ammonium nitrate white smoke and the alkaline solution is improved. Be provided with atmospheric pressure detector 28 in dissolving crystallization chamber 21's the inner wall, atmospheric pressure detector 28 and control box 17 electric connection, be provided with vacuum pump 27 on dissolving crystallization chamber 21's the right side wall, reduce the inside atmospheric pressure of dissolving crystallization chamber 21 through vacuum pump 27, then stop when the detection through atmospheric pressure detector 28 reaches suitable pressure, be convenient for alkaline solution through reducing the inside atmospheric pressure of dissolving crystallization chamber 21 after circulating with ammonium nitrate white smoke many times, the solution concentration crystallization that will contain nitrate and nitrite, thereby stop probably having the danger of gas escape.

The utility model discloses a theory of operation is: firstly, inputting ammonia into a reaction chamber 10 through an ammonia inlet 12, inputting nitric oxide gas into the reaction chamber 10 through a nitric oxide gas inlet 11, then carrying out complete gas phase reaction on the ammonia, the nitric oxide gas and water vapor to generate ammonium nitrate white smoke, then inputting the ammonium nitrate white smoke into a dissolution crystallization chamber 21, and mixing the ammonium nitrate white smoke with an alkaline solution in the dissolution crystallization chamber 21, thereby rapidly dissolving ammonia in the ammonium nitrate white smoke in the alkaline solution, reducing the air pressure in the dissolution crystallization chamber 21 so that the alkaline solution circulates with the ammonium nitrate white smoke for multiple times, concentrating and crystallizing a solution containing nitrate and nitrite, and avoiding the possible danger of gas.

Example two

Referring to fig. 3, on the basis of the first embodiment, a vertical stirring shaft 31 is arranged inside the reaction chamber 10, a motor 30 is rotatably connected to the bottom end of the stirring shaft 31, the motor 30 is electrically connected to the control box 17, the stirring shaft 31 is driven to rotate by starting the motor 30, so that the complete gas phase reaction of ammonia, nitrogen oxide gas and water vapor inside the reaction chamber 10 is accelerated, and the working efficiency is improved.

Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.

Claims

1. The device for preventing ammonia from escaping in denitration comprises a reaction chamber (10), a nitrogen oxide gas inlet (11), an ammonia inlet (12), a dissolution crystallization chamber (21) and a discharge hole (26); the device is characterized in that a nitrogen oxide gas inlet (11) is communicated with the middle of the left side wall of a reaction chamber (10), an ammonia inlet (12) is communicated with the lower portion of the left side wall of the reaction chamber (10), a distilled water inlet (13) is formed in the right side of the top of the reaction chamber (10), a pressure pump (14) is communicated with the bottom end of the distilled water inlet (13), a water vapor nozzle (15) in a disc-shaped structure is communicated with the lower side output end of the pressure pump (14), a control box (17) is arranged on the lower portion of the right side wall of the reaction chamber (10), a dissolving and crystallizing chamber (21) is communicated with the middle of the right end of the reaction chamber (10) through a connecting pipe (18), a discharge port (26) is formed in the lower portion of the right side of the dissolving and crystallizing chamber (21), a cold air chamber (25) is arranged in the inner wall of the dissolving and the cold air chamber (25) is communicated, the cold air pipe (24) is provided with a valve (23), the inner wall of the dissolution crystallization chamber (21) is provided with an air pressure detector (28), the air pressure detector (28) is electrically connected with the control box (17), and the right side wall of the dissolution crystallization chamber (21) is provided with a vacuum pump (27).

2. The apparatus for preventing ammonia slip in denitration according to claim 1, wherein an arc-shaped bottom plate (16) is provided at the inner bottom of the reaction chamber (10).

3. The device for preventing ammonia from escaping in denitration according to claim 2, wherein a fan (19) is provided at one side of the bottom of the connecting pipe (18), and the fan (19) is electrically connected with the control box (17).

4. The apparatus for preventing ammonia slip in denitration according to claim 3, wherein a check valve (20) is provided at the middle of the connection pipe (18).

5. The device for preventing ammonia from escaping in denitration according to claim 4, wherein the connection of the connection pipe (18) with the reaction chamber (10) and the dissolution crystallization chamber (21) is provided with a sealing ring (29).

6. The device for preventing ammonia from escaping in denitration according to any one of claims 1 to 5, wherein a vertical stirring shaft (31) is arranged inside the reaction chamber (10), a motor (30) is rotatably connected to the bottom end of the stirring shaft (31), and the motor (30) is electrically connected with the control box (17).