Gravity self-flowing three-stage spraying ammonia gas absorption device

Abstract

The utility model relates to the technical field of tail gas recovery, in particular to a gravity self-flowing three-stage spraying ammonia gas absorption device which comprises a first spraying tower, a second spraying tower and a third spraying tower, and the first spraying tower, the second spraying tower and the third spraying tower are all provided with circulating spraying assemblies. The acid liquor is introduced into the third spray tower under the action of gravity, the acid liquor overflows into the second spray tower after the liquid level of the acid liquor rises, and the acid liquor overflows into the first spray tower after the liquid level of the acid liquor in the second spray tower rises. The device is simple in structure and convenient to operate, self-flowing absorption of spray water is realized by using gravity as power, the production cost is reduced, and meanwhile, ammonia gas in ammonia-containing tail gas can be effectively absorbed.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas recovery technology, specifically to a gravity-driven, self-flowing, three-stage spray ammonia absorption device. Background Technology

[0002] Ammonia is an inorganic compound, a colorless gas with a strong, pungent odor, with the chemical formula NH3, a molecular weight of 17.031, and a density of 0.771 kg / m³. 3 (20℃), soluble in water, ethanol and ether, etc.

[0003] Ammonia is an important raw material in chemical production, but it can also burn the eyes, skin, and mucous membranes of the respiratory organs. Excessive inhalation of ammonia can lead to lung swelling and even death. Excessive ammonia emissions will pollute and damage the atmospheric environment. Therefore, it is necessary to adopt certain methods to avoid the direct emission of large amounts of ammonia-containing industrial waste gas generated in chemical production, thereby protecting human health and environmental safety.

[0004] To address the hazards of ammonia waste gas, the industry currently employs various treatment methods, including absorption, adsorption, catalytic combustion, and biological methods. Absorption is a method that converts harmful gases into harmless ones through physical processes, such as absorption via acid neutralization or continuous water spraying. In the treatment of ammonia waste gas, absorption is typically carried out using equipment such as spray towers or packed towers. The specific process includes two steps: pretreatment and spray absorption. First, the ammonia waste gas is initially filtered to remove particulate matter and impurities; then, the pretreated waste gas is introduced into a spray tower, where sprayed water contacts the waste gas, causing a physical reaction that absorbs the ammonia and generates corresponding salts.

[0005] In the existing technology, in order to fully absorb ammonia in ammonia-containing waste gas, multiple spray heads are often connected in series for spray treatment. This means that multiple spray towers need to be circulated with spray water for individual spray collection, and multiple power pumps and other components are used to transport water, which increases the cost of production equipment. Utility Model Content

[0006] To address the high cost of existing ammonia-containing tail gas spray absorption technologies, this invention aims to provide a gravity-driven, self-flowing, three-stage spray ammonia absorption device. This device utilizes gravity as a power source to achieve self-flowing absorption of spray water, featuring a simple structure, convenient operation, reduced production costs, and effective absorption of ammonia from tail gas.

[0007] The present invention adopts the following technical solution:

[0008] A gravity-driven, self-flowing, three-stage spray ammonia absorption device includes:

[0009] The first spray tower has an ammonia-containing tail gas inlet pipe connected to the middle of its side. The lower part of the side of the first spray tower is connected to an ammonia storage tank through an outlet pipe. The lower middle part of the side of the first spray tower is connected to a first acid pool through a first acid pipe. The first acid pool is connected to a first spray element installed in the upper part of the first spray tower through a first circulating liquid pipe. A first circulating pump group is installed on the first circulating liquid pipe.

[0010] The second spray tower has a side connection to the top of the first spray tower via a first air outlet pipe. The lower middle part of the side of the second spray tower is connected to the second acid tank via a second acid pipe. The second acid tank is connected to the second spray element installed in the upper part of the second spray tower via a second circulating liquid pipe. A second circulating pump set is installed on the second circulating liquid pipe. The side of the second spray tower is connected to the first acid tank via a first overflow pipe. The connection between the second spray tower and the first overflow pipe is located above the connection between the first acid tank and the first overflow pipe.

[0011] The third spray tower is connected to the top of the second spray tower via a second air outlet pipe on its side. The lower middle part of the side of the third spray tower is connected to the third acid tank via a third acid pipe. The third acid tank is connected to the third spray element installed in the upper part of the third spray tower via a third circulating liquid pipe. A third circulating pump group is installed on the third circulating liquid pipe. The side of the third spray tower is connected to the second acid tank via a second overflow pipe. The connection between the third spray tower and the second overflow pipe is located above the connection between the second acid tank and the second overflow pipe. The top of the third spray tower is equipped with a tail gas emission pipe.

[0012] It should be further noted that a first condenser is installed on the first circulating liquid pipe, and a second condenser is installed on the second circulating liquid pipe. The purpose of these condensers is to cool the ammonia gas that has not been fully absorbed and escaped from the first and second spray towers, causing it to liquefy from a gaseous state, which is beneficial for the full absorption of ammonia.

[0013] It should be further noted that an acid storage tank is also included. This tank is located above the third spray tower and is connected to the middle of the side of the third spray tower via an acid inlet pipe equipped with an inlet valve. Its function is to pre-store acid at a high level within the storage tank, which is then added as the raw material for absorption, facilitating operation.

[0014] It should be further noted that the first circulation pump set includes two circulation pumps connected in parallel;

[0015] The second circulation pump set includes two circulation pumps connected in parallel;

[0016] The third circulation pump set consists of two circulation pumps connected in parallel. The function is that one circulation pump operates while the other serves as a backup.

[0017] It should be further noted that there are at least two first acid pipes with different heights, and all first acid pipes are located above the connection between the first acid tank and the first overflow pipe.

[0018] There are at least two second acid pipes with different heights, and all the second acid pipes are located above the connection between the second acid tank and the second overflow pipe.

[0019] There are at least two third acid pipes of different heights. Their purpose is to allow for adjustment of the overflow height from the acid tank into the spray tower by using acid pipes at different heights.

[0020] It should be further noted that the inlet valve is a solenoid valve, and a level gauge is installed on the inner wall of the first spray tower. The level gauge is electrically connected to the controller, and the controller is electrically connected to the inlet valve. The function is that the level gauge feeds back the liquid level signal to the controller, which has a preset liquid level threshold. When the liquid level in the first spray tower drops and exceeds the threshold, the controller controls the inlet valve to open, replenishing the acid solution, thus achieving automation.

[0021] It should be further noted that the first spraying component includes several spray heads arranged in parallel, and all spray heads are installed on the inner wall of the first spraying tower.

[0022] The second spray unit includes several spray heads arranged in parallel, and all spray heads are installed on the inner wall of the second spray tower;

[0023] The third spray unit includes several spray heads arranged in parallel, and all spray heads are installed on the inner wall of the third spray tower.

[0024] It should be further noted that the ammonia storage tank and acid storage tank are made of glass enamel or silicon carbide.

[0025] The beneficial effects of this utility model are as follows: This utility model has a simple structure and is easy to operate. It uses gravity as a power source to achieve the self-flowing absorption of spray water, which reduces production costs. At the same time, it can effectively absorb ammonia gas in ammonia-containing tail gas. Attached Figure Description

[0026] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model.

[0028] In the diagram, 1-ammonia storage tank, 2-liquid outlet pipe, 3-first spray tower, 4-first overflow pipe, 5-second overflow pipe, 6-third acid pipe, 7-third acid pool, 8-third circulating pump set, 9-third circulating liquid pipe, 10-third spray tower, 11-second condenser, 12-acid storage tank, 13-inlet valve, 14-acid inlet pipe, 15-second gas outlet pipe, 16-second circulating liquid pipe, 17-second spray tower, 18-second acid pool, 19-second acid pipe, 20-first circulating pump set, 21-first circulating liquid pipe, 22-first condenser, 23-second circulating pump set, 24-first gas outlet pipe, 25-tail gas discharge pipe, 26-first acid pipe, 27-first acid pool, 28-ammonia-containing tail gas inlet pipe, 29-first spray component, 30-second spray component, 31-third spray component. Detailed Implementation

[0029] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0030] Example 1

[0031] Combination Figure 1 This utility model provides a gravity-driven, self-flowing, three-stage spray ammonia absorption device, comprising:

[0032] The first spray tower 3 has an ammonia-containing tail gas inlet pipe 28 connected to the middle of its side. The lower side of the first spray tower 3 is connected to an ammonia storage tank 1 through an outlet pipe 2. The lower middle side of the first spray tower 3 is connected to a first acid pool 27 through a first acid pipe 26. The first acid pool 27 is connected to a first spray element 29 set in the upper part of the first spray tower 3 through a first circulating liquid pipe 21. The first spray element 29 includes several spray heads arranged in parallel. All spray heads are installed on the inner wall of the first spray tower 3. A first circulating pump group 20 is provided on the first circulating liquid pipe 21. The first circulating pump group 20 includes two circulating pumps arranged in parallel.

[0033] The second spray tower 17 is connected to the top of the first spray tower 3 via the first air outlet pipe 24 on its side. The lower middle part of the side of the second spray tower 17 is connected to the second acid tank 18 via the second acid pipe 19. The second acid tank 18 is connected to the second spray element 30 located in the upper part of the second spray tower 17 via the second circulating liquid pipe 16. The second spray element 30 includes several spray heads arranged in parallel. All spray heads are installed on the inner wall of the second spray tower 17. The second circulating liquid pipe 16 is equipped with a second circulating pump group 23, which includes two circulating pumps arranged in parallel. The side of the second spray tower 17 is connected to the first acid tank 27 via the first overflow pipe 4. The connection between the second spray tower 17 and the first overflow pipe 4 is located above the connection between the first acid tank 27 and the first overflow pipe 4.

[0034] The third spray tower 10 is connected to the top of the second spray tower 17 via the second air outlet pipe 15 on its side. The lower middle part of the side of the third spray tower 10 is connected to the third acid tank 7 via the third acid pipe 6. The third acid tank 7 is connected to the third spray component 31 located in the upper part of the third spray tower 10 via the third circulating liquid pipe 9. The third spray component 31 includes several spray heads arranged in parallel. All spray heads are installed on the inner wall of the third spray tower 10. The third circulating liquid pipe 9 is equipped with a third circulating pump group 8, which includes two circulating pumps arranged in parallel. The side of the third spray tower 10 is connected to the second acid tank 18 via the second overflow pipe 5. The connection between the third spray tower 10 and the second overflow pipe 5 is located above the connection between the second acid tank 18 and the second overflow pipe 5. The top of the third spray tower 10 is equipped with a tail gas emission pipe 25.

[0035] In this invention, the ammonia-containing tail gas enters through the first spray tower 3. The ammonia concentration in the first spray tower 3 and the second spray tower 17 is relatively high and easily escapes. The first circulating liquid pipe 21 is equipped with a first condenser 22, and the second circulating liquid pipe 16 is equipped with a second condenser 11. The condensers can cool the ammonia gas that has not been fully absorbed and escaped in the first spray tower 3 and the second spray tower 17, causing it to liquefy from a gaseous state, which is beneficial to the full absorption of ammonia gas.

[0036] This utility model also includes an acid storage tank 12, which is located above the third spray tower 10. The acid storage tank 12 is connected to the middle of the side of the third spray tower 10 through an acid inlet pipe 14, and an inlet valve 13 is provided on the acid inlet pipe 14. The acid is pre-stored at a high level in the acid storage tank 12 and added as the raw material for absorption, which is convenient to operate.

[0037] This invention features two first acid pipes 26 of different heights, all located above the connection between the first acid tank 27 and the first overflow pipe 4; two second acid pipes 19 of different heights, all located above the connection between the second acid tank 18 and the second overflow pipe 5; and two third acid pipes 6 of different heights. By setting acid pipes of different heights, the overflow height from the acid tank into the spray tower can be easily adjusted.

[0038] The inlet valve 13 of this invention is a solenoid valve. A level gauge is installed on the inner wall of the first spray tower 3. The level gauge is electrically connected to a PLC controller, and the PLC controller is electrically connected to the inlet valve 13. The level gauge feeds back the level signal to the PLC controller. The PLC controller has a preset level threshold. When the level in the first spray tower 3 drops and exceeds the threshold, the PLC controller controls the inlet valve 13 to open, replenishing the acid solution and achieving automation.

[0039] The ammonia storage tank 1 and acid storage tank 12 of this utility model are both made of enamel glass, which increases corrosion resistance.

[0040] The working process of this utility model is as follows:

[0041] Acid is pre-stored at a high level in acid storage tank 12. When the inlet valve 13 is opened, acid is introduced into the third spray tower 10 by gravity. After the acid level rises, it overflows into the third acid pool 7 and simultaneously enters the second acid pool 18 through the second overflow pipe 5. After the level in the second acid pool 18 rises, it overflows into the second spray tower 17. After the level in the second spray tower 17 rises, it enters the first spray tower 3 through the first overflow pipe 4.

[0042] Ammonia-containing tail gas is introduced into the first spray tower 3 through the ammonia tail gas inlet pipe 28. The first circulation pump group 20, the second circulation pump group 23, and the third circulation pump group 8 are turned on to circulate and spray the tail gas entering each tower for absorption. The saturated ammonia water after absorption enters the ammonia water storage tank 1 through the liquid outlet pipe 2 for storage.

[0043] During the spray absorption process, the acid will be consumed. It can be replenished by opening the inlet valve 13 and then through the acid storage tank 12.

[0044] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gravity-driven, self-flowing, three-stage spray ammonia absorption device, characterized in that, include: The first spray tower has an ammonia-containing tail gas inlet pipe connected to the middle of its side. The lower part of the side of the first spray tower is connected to an ammonia storage tank through an outlet pipe. The lower middle part of the side of the first spray tower is connected to a first acid pool through a first acid pipe. The first acid pool is connected to a first spray element installed in the upper part of the first spray tower through a first circulating liquid pipe. A first circulating pump group is installed on the first circulating liquid pipe. The second spray tower is connected to the side of the first spray tower via a first air outlet pipe. The lower middle part of the side of the second spray tower is connected to the second acid tank via a second acid pipe. The second acid tank is connected to the second spray element installed in the upper part of the second spray tower via a second circulating liquid pipe. A second circulating pump group is installed on the second circulating liquid pipe. The side of the second spray tower is connected to the first acid tank via a first overflow pipe. The connection between the second spray tower and the first overflow pipe is located above the connection between the first acid tank and the first overflow pipe. The third spray tower is connected to the side of the second spray tower via a second air outlet pipe. The lower middle part of the side of the third spray tower is connected to the third acid tank via a third acid pipe. The third acid tank is connected to the third spray element located in the upper part of the third spray tower via a third circulating liquid pipe. A third circulating pump set is installed on the third circulating liquid pipe. The side of the third spray tower is connected to the second acid tank via a second overflow pipe. The connection between the third spray tower and the second overflow pipe is located above the connection between the second acid tank and the second overflow pipe. The top of the third spray tower is equipped with a tail gas emission pipe.

2. The gravity-driven self-flowing three-stage spray ammonia absorption device as described in claim 1, characterized in that, The first circulating liquid pipe is equipped with a first condenser, and the second circulating liquid pipe is equipped with a second condenser.

3. The gravity-driven self-flowing three-stage spray ammonia absorption device as described in claim 1, characterized in that, It also includes an acid storage tank, which is located above the third spray tower. The acid storage tank is connected to the middle of the side of the third spray tower through an acid inlet pipe, which is equipped with an inlet valve.

4. A gravity-driven, self-flowing, three-stage spray ammonia absorption device as described in any one of claims 1-3, characterized in that, The first circulation pump set includes two circulation pumps connected in parallel; The second circulation pump set includes two circulation pumps connected in parallel; The third circulation pump set consists of two circulation pumps connected in parallel.

5. A gravity-driven, self-flowing, three-stage spray ammonia absorption device as described in any one of claims 1-3, characterized in that, There are at least two first acid pipes with different heights, and all first acid pipes are located above the connection between the first acid tank and the first overflow pipe. There are at least two second acid pipes with different heights, and all the second acid pipes are located above the connection between the second acid tank and the second overflow pipe. There are at least two third acid tubes, and they are at different heights.

6. The gravity-driven self-flowing three-stage spray ammonia absorption device as described in claim 3, characterized in that, The inlet valve is a solenoid valve. A level gauge is installed on the inner wall of the first spray tower. The level gauge is electrically connected to the controller, and the controller is electrically connected to the inlet valve.

7. A gravity-driven, self-flowing, three-stage spray ammonia absorption device as described in any one of claims 1-3, characterized in that, The first spraying component includes several spray heads arranged in parallel, and all spray heads are installed on the inner wall of the first spraying tower; The second spray unit includes several spray heads arranged in parallel, and all spray heads are installed on the inner wall of the second spray tower; The third spray unit includes several spray heads arranged in parallel, and all spray heads are installed on the inner wall of the third spray tower.

8. The gravity-driven self-flowing three-stage spray ammonia absorption device as described in claim 1, characterized in that, The ammonia storage tank and acid storage tank are made of glass enamel or silicon carbide.

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