Tail gas treatment device for ammonia water storage

Abstract

The utility model relates to a tail gas treatment device for ammonia water storage. Comprising an ammonia water storage tank, an ammonia water inlet pipeline and an ammonia water outlet pipeline are arranged on the ammonia water storage tank, an ammonia gas outlet pipeline is arranged on one side of the upper portion of the ammonia water storage tank, and the ammonia gas outlet pipeline is connected with a tail gas treatment part through a first self-operated regulating valve; the tail gas treatment part at least comprises a pickling tower and a biological deodorization device which are connected in sequence; the method has the characteristics of reduction of the ammonia odor in the operation site, environmental friendliness, thorough treatment of ammonia gas in tail gas, avoidance of explosion and realization of long-period stable operation of the ammonia water storage tank.

Description

Technical Field

[0001] The utility model relates to the technical field of ammonia water storage accessory components, in particular to a tail gas treatment device for ammonia water storage. Background Art

[0002] The existing ammonia water storage device includes an ammonia water tank, which is provided with an ammonia water inlet and an ammonia water outlet. The top of the ammonia water tank is provided with a breathing valve and an exhaust gas exhaust pipe, and the exhaust gas exhaust pipe is connected to a water seal device, which is used to absorb ammonia in the exhaust gas, and the exhaust gas after absorbing ammonia is discharged. In the above arrangement, the water seal device is used to absorb ammonia in the exhaust gas, and the water in the water seal is replaced irregularly according to the concentration; when the water concentration in the above water seal is controlled too low, the ammonia water concentration in the water seal is too low and flows back into the ammonia water tank, which will affect the concentration of ammonia water in the ammonia water tank (affecting the use of subsequent processes); when the water concentration in the above water seal is controlled too high, a large amount of ammonia in the exhaust gas will be unable to be absorbed; further, the above arrangement cannot effectively remove ammonia, resulting in excessive ammonia smell on site, which not only affects the environment, but also forms explosive gas after mixing with air, which will explode when encountering open flames in a limited space. Utility Model Content

[0003] The utility model aims to provide a tail gas treatment device for storing ammonia water to solve the problems raised in the above-mentioned background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A tail gas treatment device for ammonia water storage comprises an ammonia water storage tank, on which an ammonia water inlet pipe and an ammonia water outlet pipe are arranged, an ammonia gas outlet pipe is arranged on one side of the upper part of the ammonia water storage tank, and the ammonia gas outlet pipe is connected to a tail gas treatment unit via a first self-operated regulating valve; the tail gas treatment unit comprises at least a pickling tower and a biological deodorization device which are connected in sequence.

[0006] The beneficial effects of the utility model are as follows: the utility model sets a first self-operated regulating valve to achieve effective removal of ammonia in the tail gas through the ammonia outlet pipe into the tail gas treatment unit when the tail gas pressure in the ammonia water storage tank is too high. The removal process includes allowing the ammonia to enter the pickling tower and the biological deodorization device for treatment. The above arrangement can not only effectively remove the ammonia in the tail gas, but also reduce the arrangement of the breathing valve, thereby avoiding the defects of direct discharge of ammonia in the tail gas from the ammonia water storage tank, causing environmental pollution and easy explosion.

[0007] Preferably, a fan is provided between the first self-operated regulating valve and the pickling tower.

[0008] Preferably, the outlet of the biological deodorization device is connected to an exhaust pipe.

[0009] Preferably, an inert compensation gas inlet pipeline is provided on the upper portion of the ammonia water storage tank, and a second self-operated regulating valve is provided on the inert compensation gas inlet pipeline.

[0010] Preferably, the inlet end of the inert compensation gas inlet pipeline is connected to the low-pressure nitrogen pipeline network.

[0011] Preferably, a breathing valve is provided at the middle position of the top of the ammonia water storage tank.

[0012] An exhaust gas treatment device for ammonia water storage made according to the above scheme is based on the first self-operated regulating valve and the exhaust gas treatment part. The opening and closing of the first self-operated regulating valve and the start-up of the subsequent exhaust gas treatment part are controlled by the pressure in the ammonia water storage tank, thereby achieving the purpose of avoiding direct exhaust gas discharge and effectively removing ammonia in the exhaust gas. It is environmentally friendly and prevents explosion accidents. Furthermore, when ammonia water is discharged, the pressure in the ammonia water storage tank is reduced. In order to achieve the safe operation of the ammonia water storage tank, the utility model is provided with an inert compensation gas inlet pipeline with a second self-operated regulating valve. The above arrangement can not only compensate for the pressure in the ammonia storage tank to ensure the safe operation of the ammonia storage tank, but also mix the inert compensation gas with the ammonia, thereby reducing the risk of explosion on the basis of reducing the processing load of the exhaust gas treatment unit; in addition, the role of the breathing valve set in the utility model is different from that of the traditional breathing valve. Its purpose is to achieve emergency use when the first self-operated regulating valve and the second self-operated regulating valve fail; it has the characteristics of reducing the ammonia smell at the work site, being environmentally friendly, thoroughly treating the ammonia in the exhaust gas, avoiding explosions and achieving long-term stable operation of the ammonia storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] In the figure: 1. Ammonia storage tank; 2. Ammonia inlet pipeline; 3. Ammonia outlet pipeline; 4. First self-operated regulating valve; 5. Fan; 6. Pickling tower; 7. Biological deodorization device; 8. Exhaust pipe; 9. Inert compensation gas inlet pipeline; 10. Second self-operated regulating valve; 11. Low-pressure nitrogen pipeline network; 12. Breathing valve. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0016] Reference Figure 1As shown, an exhaust gas treatment device for ammonia water storage includes an ammonia water storage tank 1, on which an ammonia water inlet pipe 2 and an ammonia water outlet pipe 3 are arranged, and an ammonia gas outlet pipe is arranged on one side of the upper part of the ammonia water storage tank 1, and the ammonia gas outlet pipe is connected to the exhaust gas treatment part through a first self-operated regulating valve 4; the exhaust gas treatment part at least includes a pickling tower 6 and a biological deodorization device 7 connected in sequence. The working principle of the pickling tower 6 described in the utility model is: the ammonia-containing exhaust gas flows upward from the bottom of the pickling tower 6, and the circulating liquid is sprayed downward through the nozzle arranged at the top of the tower to absorb the ammonia in the gas and remove a large amount of ammonia in the gas; the circulating liquid flows from the tower to the circulating water tank by gravity, and the circulating water tank maintains the pH value through the sulfuric acid dosing device to ensure the absorption effect of ammonia; the circulating liquid in the circulating water tank is pressurized by the circulating water pump and sent to the nozzle to complete the circulation. The working principle of the biological deodorization device 7 is as follows: the deodorization device adopts a biological trickling filter process and utilizes a large amount of water for continuous spraying to mainly remove malodorous substances such as NH3, H2S, and dimethyl sulfide; the process uses large-pore fillers to cultivate and generate biofilms on the surface of the fillers, and uses a large amount of water for spraying and washing gas-liquid cross-flow, so that water-soluble pollutants are absorbed and decomposed by microorganisms attached to the fillers in the form of biofilms; a demister is arranged at the gas outlet of the device to prevent the sprayed liquid water from entering the exhaust gas and reduce the loss of circulating water. The above-mentioned arrangement of the utility model uses the pressure inside the ammonia storage tank 1 as the driving force. On the basis of eliminating the need for a traditional breathing valve, the first self-operated regulating valve 4 is opened by the pressure. After opening, the ammonia-containing tail gas in the ammonia storage tank 1 enters the pickling tower 6 and the biological deodorization device 7 in turn through the first self-operated regulating valve 4. The ammonia in the tail gas is effectively removed by the pickling tower 6 and the biological deodorization device 7 to achieve the purpose of being environmentally friendly and avoiding the mixing of ammonia and air to form explosive gas; the above-mentioned pickling tower 6 and the biological deodorization device 7 can be directly purchased on the market, and their structures are not repeated here.

[0017] Furthermore, a fan 5 is provided between the first self-operated regulating valve 4 and the pickling tower 6. By providing the fan 5, the tail gas can overcome the resistance and quickly enter the pickling tower 6, while the pressure in the ammonia storage tank 1 is maintained at a certain level to ensure that the ammonia storage tank 1 can be used stably for a long time.

[0018] Furthermore, the outlet of the biological deodorization device 7 is connected to the exhaust pipe 8. In actual use, the utility model can make the high-concentration ammonia-containing tail gas from the ammonia water storage tank 1 first pass through the acid washing tower 6 for washing to remove most of the ammonia, and the tail gas from the acid washing tower 6 enters the biological deodorization device 7 for further biochemical treatment, and the qualified gas after treatment is sent to the exhaust pipe 8 for external discharge, so as to achieve the purpose of effectively removing ammonia.

[0019] Furthermore, an inert compensation gas inlet pipeline 9 is provided at the upper part of the ammonia water storage tank 1, and a second self-operated regulating valve 10 is provided on the inert compensation gas inlet pipeline 9. When the ammonia water storage tank 1 delivers ammonia water to the outside through the ammonia water outlet pipeline 3, the gas phase space at the upper part of the ammonia water storage tank 1 increases, the pressure decreases, the first self-operated regulating valve 4 is in a closed state, and the tail gas is not discharged; when the pressure in the ammonia water storage tank 1 decreases to a certain threshold, the second self-operated regulating valve 10 automatically opens, and the inert compensation gas enters the ammonia water tank to maintain the gas phase pressure in the ammonia water storage tank 1 relatively stable; because the inert compensation gas is provided, it can prevent ammonia gas from combining with air to form explosive gas, so as to achieve long-term stable operation of the ammonia water storage tank 1 on the basis of compensating the internal pressure of the ammonia water storage tank 1.

[0020] Furthermore, the inlet end of the inert compensation gas inlet pipeline 9 is connected to the low-pressure nitrogen pipeline network 11 .

[0021] Furthermore, a breathing valve 12 is provided at the middle position of the top of the ammonia storage tank 1. The breathing valve 12 described in the utility model is mainly used for when the first self-operated regulating valve 4 and / or the second self-operated regulating valve 10 fails, the pressure in the ammonia storage tank 1 is too high or too low, and the breathing valve 12 arranged at the top of the ammonia storage tank 1 is actuated to discharge the gas in the ammonia storage tank 1 to the atmosphere or to inhale air into the tank, so as to ensure that the tank is not negatively charged or over-pressurized. That is, the breathing valve 12 in the utility model is designed to ensure the operation of the ammonia storage tank 1 in an emergency state.

[0022] The working principle of the utility model is as follows: when the ammonia inlet pipeline 2 injects ammonia into the ammonia storage tank 1, the gas phase space at the upper part of the ammonia storage tank 1 becomes smaller, the gas is compressed, and the pressure increases; as the pressure increases, the first self-operated regulating valve 4 arranged on the ammonia outlet pipeline opens, and the tail gas is transported to the pickling tower 6 (in order to overcome the pipeline resistance, a fan 5 is arranged between the first self-operated regulating valve 4 and the pickling tower 6, and the pressure in the ammonia storage tank 1 is maintained at a certain level by the fan 5); the ammonia-containing tail gas with a higher concentration is first washed in the pickling tower 6 to remove most of the ammonia (the waste liquid generated in the pickling tower 6 is sent to the sewage treatment station for treatment), and the tail gas coming out of the pickling tower 6 enters the biological deodorization device 7 for further biochemical treatment, and the qualified gas after treatment is sent to the exhaust pipe 8 for external discharge, so as to achieve the purpose of effectively removing ammonia. When the ammonia storage tank 1 delivers ammonia to the outside through the ammonia outlet pipe 3, the gas phase space at the top of the ammonia storage tank 1 increases, the pressure decreases, the first self-operated regulating valve 4 is in a closed state, and the tail gas is not discharged; when the pressure in the ammonia storage tank 1 drops to a certain threshold, the second self-operated regulating valve 10 automatically opens, and the inert compensation gas enters the ammonia storage tank to maintain the gas phase pressure in the ammonia storage tank 1 relatively stable; because the inert compensation gas is set, it can prevent ammonia from combining with air to form explosive gas, so as to achieve long-term stable operation of the ammonia storage tank 1 on the basis of compensating the internal pressure of the ammonia storage tank 1. When the first self-operated regulating valve 4 and / or the second self-operated regulating valve 10 fails, the pressure in the ammonia storage tank 1 is too high or too low, and the breathing valve 12 set at the top of the ammonia storage tank 1 is activated, so that the gas in the ammonia storage tank 1 is discharged to the atmosphere or air is sucked into the tank to ensure that the tank is not negatively charged or over-pressurized. Thereby ensuring the long-term stable operation of the ammonia storage tank 1. It should be noted that: the ammonia storage tank 1 can be provided with a pressure sensor to realize real-time monitoring of the internal pressure of the ammonia storage tank 1. In addition, the utility model can be controlled manually or automatically, that is, when it is controlled manually, the blower 5 can be manually turned on when the first self-operated regulating valve 4 is opened, and the pickling tower 6 and the biological deodorization device 7 can be started; when it is controlled automatically, a single-chip microcomputer or interlocking control can be used to open the corresponding regulating valve and related processing equipment based on the pressure data in the ammonia storage tank 1. It has the characteristics of reducing the ammonia smell at the operation site, being environmentally friendly, thoroughly treating the ammonia in the tail gas, avoiding explosions, and realizing long-term stable operation of the ammonia storage tank.

[0023] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An exhaust gas treatment device for storing ammonia water, comprising an ammonia water storage tank (1), the ammonia water storage tank (1) being provided with an ammonia water inlet pipe (2) and an ammonia water outlet pipe (3), characterized in that: An ammonia outlet pipeline is provided on one side of the upper part of the ammonia water storage tank (1), and the ammonia outlet pipeline is connected to the tail gas treatment part through a first self-operated regulating valve (4); the tail gas treatment part at least comprises a pickling tower (6) and a biological deodorization device (7) which are connected in sequence.

2. The tail gas treatment device for storing ammonia water according to claim 1, characterized in that: A fan (5) is provided between the first self-operated regulating valve (4) and the pickling tower (6).

3. The tail gas treatment device for storing ammonia water according to claim 1, characterized in that: The outlet of the biological deodorization device (7) is connected to the exhaust pipe (8).

4. The tail gas treatment device for storing ammonia water according to claim 1, characterized in that: An inert compensation gas inlet pipeline (9) is provided on the upper part of the ammonia water storage tank (1), and a second self-operated regulating valve (10) is provided on the inert compensation gas inlet pipeline (9).

5. The tail gas treatment device for storing ammonia water according to claim 4, characterized in that: The inlet end of the inert compensation gas inlet pipeline (9) is connected to the low-pressure nitrogen pipeline network (11).

6. A tail gas treatment device for storing ammonia water according to any one of claims 1 to 5, characterized in that: A breathing valve (12) is provided at the middle position of the top of the ammonia water storage tank (1).

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