An automated tail gas absorption device

Abstract

The utility model relates to chemical tail gas absorption technical field, concretely to a kind of automatic tail gas absorption device, comprising: multiple spray absorption tower, control mechanism, spray absorption tower is by circulating water tank, spray tower is formed, circulating water tank side wall is equipped with air inlet, liquid outlet respectively in upper and lower ends, spray tower is equipped with demister, spray, filter packing, and spray tower upper end head is equipped with exhaust port;Air inlet is equipped with pressure sensor;Circulating water tank side wall is equipped with liquid level sensor, oxidation-reduction potential sensor;Liquid outlet outer connecting pipeline is equipped with circulating pump, and circulating pump outlet is equipped with the three-way valve that is connected with the pipeline of spray, and three-way valve is triggered action by pressure sensor or oxidation-reduction potential sensor;Spray tower is also equipped with liquid replenishment spray.The utility model relates to a kind of automatic tail gas absorption device, and according to lye concentration uses the mode of back stage to front stage reuse to automatically carry out lye replenishment.

Description

Technical Field

[0001] This utility model relates to the field of chemical tail gas absorption technology, specifically an automated tail gas absorption device. Background Technology

[0002] Liquid chlorine, also known as liquid chlorine, is a yellowish-green liquid that is highly toxic. It vaporizes into a gas under normal pressure; inhalation can cause severe poisoning. It is extremely irritating and corrosive, and can ignite and explode when mixed with other flammable gases in sunlight. It is highly reactive and can react with most elements or compounds. Liquid chlorine is widely used in chemical production, commonly for bleaching, manufacturing chlorine compounds, synthetic rubber, pesticides, and synthetic fibers. Therefore, liquid chlorine is a highly toxic chemical, and improper storage and use can have very serious consequences for the environment and human health.

[0003] Currently, the main methods for absorbing chlorine in engineering accidents include: alkaline absorption, which involves the reaction of chlorine gas with an alkaline solution to generate harmless hypochlorite and chloride; sodium thiosulfate reduction, which involves reducing chlorine gas to non-toxic chloride using sodium thiosulfate; activated carbon adsorption, which involves removing chlorine gas through physical or chemical adsorption of metal oxides loaded on activated carbon; water absorption, which involves the formation of chlorine water by the slight solubility of chlorine gas in water; and metal reduction, which involves the reaction of chlorine gas with metals to generate chloride.

[0004] Alkali absorption is widely used in industrial waste gas treatment processes due to its high efficiency, low cost, and the use of multi-stage absorption towers connected in series to absorb chlorine. However, conventional multi-stage absorption towers still have the following shortcomings under actual operating conditions:

[0005] 1. As the alkaline solution reacts with chlorine, the concentration of the alkaline solution decreases. Therefore, it is necessary to replenish the absorption tower with high concentration alkaline solution from time to time. The conventional method of replenishing alkaline solution is to add it manually according to the detected concentration of alkaline solution. This method is accompanied by the risk of chlorine leakage during sampling and testing. In addition, the method of manually opening the valve and starting the pump can also lead to insufficient chlorine absorption due to untimely addition.

[0006] 2. The flow rate of the alkali supply pump is fixed. When multiple absorption towers need to be replenished with alkali at the same time, the replenishment time of the alkali is prolonged, which seriously affects the chlorine absorption effect. Utility Model Content

[0007] In order to solve the technical problems existing in the background art, this utility model provides an automated exhaust gas absorption device that automatically replenishes the alkali solution according to the concentration of the alkali solution by reusing the downstream stage to the upstream stage.

[0008] The technical solution adopted by this utility model is:

[0009] An automated exhaust gas absorption device includes:

[0010] The system includes multiple spray absorption towers and a control mechanism. Each spray absorption tower consists of an interconnected circulating water tank and a spray tower. The circulating water tank has an air inlet and a liquid outlet at its upper and lower ends on its side wall, respectively. The spray tower is equipped with a demister, spraying equipment, and filter packing. An exhaust port is provided at the top end cap of the spray tower.

[0011] A pressure sensor is installed at the air inlet; a liquid level sensor and a redox potential sensor are connected to the side wall of the circulating water tank; a circulating conveying pump is installed on the external pipeline of the drain outlet, and a three-way valve connected to the spray pipeline is installed at the outlet of the circulating conveying pump. The three-way valve is triggered by the liquid level sensor or the redox potential sensor; a replenishment spray extending outward is also installed inside the spray tower.

[0012] Furthermore, the demister is located in the upper part of the spray tower;

[0013] The spray pipeline is divided into upper and lower sections by a tee fitting, and is respectively connected to the upper circulating spray and the lower circulating spray; the filter packing is provided in two sets, and is respectively located below the upper circulating spray and the lower circulating spray.

[0014] Furthermore, the replenishing spray is positioned above the circulating spray.

[0015] Furthermore, the pressure sensor, liquid level sensor, redox potential sensor, and three-way valve are electrically connected to the control mechanism.

[0016] Furthermore, the spray absorption tower is provided with N units, where N≥3; and is labeled as N-stage spray absorption towers in reverse order of the direction in which the exhaust gas enters.

[0017] Furthermore, on the first-stage spray absorption tower: the air inlet is connected to the exhaust port of the second-stage spray absorption tower; a fan is connected to the exhaust port, and the fan is triggered by a pressure sensor on the air inlet pipeline of the first-stage spray absorption tower; a liquid alkali main valve and a feed pump are sequentially connected to the liquid alkali tank on the liquid replenishment spray pipeline, and the liquid alkali main valve is triggered by a liquid level sensor of the first-stage spray absorption tower.

[0018] Furthermore, in the M-th stage spray absorption tower, where 1 < M < N: the air inlet is connected to the exhaust port of the M+1-th stage spray absorption tower; the exhaust port is connected to the air inlet of the M-1-th stage spray absorption tower; the three-way valve is triggered by the liquid level sensor of the M+1-th stage spray absorption tower; the liquid level sensor is used to trigger the three-way valve of the M-1-th stage spray absorption tower; the replenishment spray pipeline is connected to the three-way valve of the M-1-th stage spray absorption tower.

[0019] Furthermore, on the Nth stage spray absorption tower: the air inlet is connected to the exhaust gas supply pipeline; the exhaust outlet is connected to the air inlet of the N-1th stage spray absorption tower; the three-way valve is connected to the waste absorption liquid tank and is triggered by the oxidation-reduction potential sensor; the replenishment spray pipeline is connected to the three-way valve of the N-1th stage spray absorption tower.

[0020] Furthermore, the fan is electrically connected to the control mechanism via a frequency converter, and the fan speed is adjusted via a pressure sensor.

[0021] Furthermore, check valves are respectively connected to the outlets of the circulating conveying pump, the feeding pump, and the blower.

[0022] The advantages of this automated exhaust gas absorption device are as follows:

[0023] Based on the alkali concentration, the high-concentration alkali solution in the next-stage spray absorption tower is replenished to maintain the alkali concentration in the current spray absorption tower, thus meeting the absorption conditions. Liquid alkali is replenished by the last-stage spray absorption tower, and waste alkali is discharged from the first-stage spray absorption tower. This ensures absorption efficiency and prevents chlorine gas leakage. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the absorption tower according to an example of this utility model;

[0025] Figure 2 This is a schematic diagram of the absorption device of this utility model.

[0026] In the picture:

[0027] 1. Pressure sensor, 2. Liquid level sensor, 3. Oxidation-reduction potential sensor, 4. Circulating transfer pump, 5. Three-way valve, 6. Circulating upper spray, 7. Circulating lower spray, 8. Liquid replenishment spray, 9. Liquid replenishment shut-off valve. Detailed Implementation

[0028] To more clearly and explicitly illustrate the specific implementation objectives and methods of this utility model, the technical solution of this utility model will be fully described below. The described embodiments are only some embodiments of this utility model, not all embodiments. Without creative effort, all other embodiments based on the described embodiments of this utility model are within the protection scope of this utility model.

[0029] This utility model discloses an automated exhaust gas absorption device, such as... Figure 1 As shown, it includes:

[0030] The system includes multiple spray absorption towers and a control mechanism. Each spray absorption tower consists of an interconnected circulating water tank and spray towers. The circulating water tank has an air inlet and a liquid outlet at its upper and lower ends on its side wall, respectively. A pressure sensor 1, electrically connected to the control mechanism, is installed at the air inlet. Each spray tower contains a demister, spraying equipment, and filter media. The demister is located in the upper part of the spray tower. The spraying pipeline is divided into upper and lower sections via a T-fitting, which are connected to the upper circulating spray 6 and the lower circulating spray 7, respectively. Two sets of filter media are installed below the upper circulating spray 6 and the lower circulating spray 7, respectively. An exhaust port is provided at the top end cap of the spray tower.

[0031] A pressure sensor 1 is installed at the air inlet; a liquid level sensor 2 and an oxidation-reduction potential sensor 3 are connected to the side wall of the circulating water tank; a circulating conveying pump 4 is installed on the external pipeline of the drain outlet, and a three-way valve 5 connected to the spray pipeline is installed at the outlet of the circulating conveying pump 4. The three-way valve 5 is triggered by the oxidation-reduction potential sensor 3; a replenishing spray 8 is also installed in the spray tower, and the replenishing spray 8 is located above the circulating spray 6.

[0032] Pressure sensor 1, liquid level sensor 2, oxidation-reduction potential sensor 3, three-way valve 5, and liquid replenishment shut-off valve 9 are electrically connected to the control mechanism respectively; check valves are connected to the outlets of circulating conveying pump 4, feeding pump, and blower respectively.

[0033] like Figure 2 As shown, there are N spray absorption towers, where N≥3; and they are labeled as N stages of spray absorption towers in reverse order of the direction of exhaust gas inflow, where:

[0034] On the first-stage spray absorption tower:

[0035] The air inlet is connected to the exhaust port of the second-stage spray absorption tower; a fan is connected to the exhaust port, and the fan is electrically connected to the control mechanism via a frequency converter. The fan is triggered by the pressure sensor 1 on the air inlet pipeline of the first-stage spray absorption tower, and the speed is adjusted accordingly; a liquid alkali main valve and a feed pump are sequentially connected to the liquid alkali tank on the liquid replenishment spray 8 pipeline, and the liquid alkali main valve is triggered by the liquid level sensor 2 of the first-stage spray absorption tower.

[0036] On the Mth stage spray absorption tower, where 1 < M < N:

[0037] The air inlet is connected to the exhaust port of the M+1 stage spray absorption tower; the exhaust port is connected to the air inlet of the M-1 stage spray absorption tower; the three-way valve 5 is triggered by the liquid level sensor 2 of the M+1 stage spray absorption tower; the liquid level sensor 2 is used to trigger the three-way valve 5 of the M-1 stage spray absorption tower; the replenishment spray 8 pipeline is connected to the three-way valve 5 of the M-1 stage spray absorption tower.

[0038] On the Nth stage spray absorption tower:

[0039] The air inlet is connected to the exhaust gas supply pipeline; the exhaust outlet is connected to the air inlet of the N-1 stage spray absorption tower; the three-way valve 5 is connected to the waste absorption liquid tank and is triggered by the oxidation-reduction potential sensor 3; the replenishment spray 8 pipeline is connected to the three-way valve 5 of the N-1 stage spray absorption tower.

[0040] Check valves are connected to the outlets of the circulating conveying pump 4, the feeding pump, and the blower. An inlet shut-off valve is installed on the inlet connecting pipe, and an exhaust shut-off valve is installed on the exhaust connecting pipe. A bypass pipe is installed between the inlet and exhaust shut-off valves, and a bypass shut-off valve is installed on the bypass pipe. This allows the spray absorption tower that supplies alkali to the previous stage to stop exhausting, and to resume exhausting only after sufficient alkali has been supplied; it also facilitates the shutdown and maintenance of any spray absorption tower in the system.

[0041] This process is also applicable to water washing towers, acid washing towers, and other similar applications. It can also handle emergency chlorine in rooms. The air intake volume can be set according to the room size.

[0042] In summary, the above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification. All equivalent variations and modifications of the shape, structure, features, and spirit described in the claims of this utility model should be included within the scope of the claims of this utility model.

Claims

1. An automated exhaust gas absorption device, comprising: The system comprises multiple spray absorption towers and a control mechanism. Each spray absorption tower consists of an interconnected circulating water tank and spray towers. The circulating water tank has an air inlet and a liquid outlet at its upper and lower ends on its side wall, respectively. The spray towers are equipped with demisters, spraying equipment, and filter media. An exhaust port is located at the top end of each spray tower. The system is characterized by: A pressure sensor (1) is installed at the air inlet; A liquid level sensor (2) and an oxidation-reduction potential sensor (3) are connected to the side wall of the circulating water tank; A circulating conveying pump (4) is installed on the external connecting pipeline of the drain outlet. A three-way valve (5) connected to the spraying pipeline is installed at the outlet of the circulating conveying pump (4). The three-way valve (5) is triggered by a liquid level sensor (2) or an oxidation-reduction potential sensor (3). The spray tower is also equipped with outward-extending replenishment spray (8).

2. The automated exhaust gas absorption device according to claim 1, characterized in that: The demister is installed in the upper part of the spray tower; The spray pipeline is divided into upper and lower sections by a T-fitting, and is respectively connected to the circulating upper spray (6) and circulating lower spray (7); The filter media are provided in two sets, and are respectively located below the circulating upper spray (6) and circulating lower spray (7).

3. The automated exhaust gas absorption device according to claim 2, characterized in that: The replenishing spray (8) is positioned above the circulating spray (6).

4. An automated exhaust gas absorption device according to claim 2 or 3, characterized in that: The pressure sensor (1), liquid level sensor (2), oxidation-reduction potential sensor (3), and three-way valve (5) are electrically connected to the control mechanism.

5. An automated exhaust gas absorption device according to claim 4, characterized in that: The spray absorption tower is provided in N units, where N≥3; and is labeled as N-stage spray absorption towers in reverse order of the direction in which the exhaust gas enters.

6. An automated exhaust gas absorption device according to claim 5, characterized in that: On the first-stage spray absorption tower: The air inlet is connected to the exhaust outlet of the second-stage spray absorption tower; The exhaust port is connected to a fan, which is triggered by a pressure sensor (1) on the inlet pipe of the first-stage spray absorption tower. The liquid replenishment spray (8) pipeline is sequentially connected to a liquid alkali main valve and a feed pump, and is connected to a liquid alkali tank. The liquid alkali main valve is triggered by the liquid level sensor (2) of the first-stage spray absorption tower.

7. An automated exhaust gas absorption device according to claim 6, characterized in that: On the Mth stage spray absorption tower, where 1 < M < N: The air inlet is connected to the exhaust outlet of the M+1 stage spray absorption tower; The exhaust port is connected to the air inlet of the M-1 stage spray absorption tower; The three-way valve (5) is triggered by the liquid level sensor (2) of the M+1 stage spray absorption tower; The liquid level sensor (2) is used to trigger the three-way valve (5) of the M-1 stage spray absorption tower; The replenishment spray (8) pipeline is connected to the three-way valve (5) of the M-1 stage spray absorption tower.

8. An automated exhaust gas absorption device according to claim 7, characterized in that: On the Nth stage spray absorption tower: The air inlet is connected to the exhaust gas supply pipeline; The exhaust port is connected to the air inlet of the N-1 stage spray absorption tower; The three-way valve (5) is connected to the waste absorption tank and is triggered by the oxidation-reduction potential sensor (3); the replenishment spray (8) pipeline is connected to the three-way valve (5) of the N-1 stage spray absorption tower.

9. An automated exhaust gas absorption device according to claim 8, characterized in that: The fan is electrically connected to the control mechanism via a frequency converter, and the fan speed is adjusted by a pressure sensor (1).

10. An automated exhaust gas absorption device according to claim 9, characterized in that: Check valves are connected to the outlets of the circulating conveying pump (4), the feeding pump, and the blower, respectively.

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