Chlorine recovery treatment device

Abstract

The utility model provides a chlorine recovery processing device which comprises a first spray tower, a second spray tower and a third spray tower, the first spray tower is provided with a first air inlet and a first air outlet, and a water spraying device is further arranged in the first spray tower and used for spraying water to gas in the first spray tower; the second spraying tower is provided with a second air inlet and a second air outlet, the second air inlet is communicated with the first air outlet, and alkali spraying equipment is arranged in the second spraying tower and used for spraying alkali liquor to gas in the second spraying tower; the third spraying tower is provided with a third air inlet and a third air outlet, the third air inlet is communicated with the second air outlet, and a liquid spraying device is arranged in the third spraying tower and used for spraying alkali liquor to gas in the third spraying tower. And the recovery treatment rate of chlorine is further improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of chlorine treatment, and specifically relates to a chlorine recovery and treatment device. Background Art

[0002] With the development of industrialization and urbanization, waste gas treatment has become an important environmental protection task in today's society. Among them, chlorine recovery and treatment is a key link in the waste gas treatment process. High concentrations of chlorine not only harm the ecological environment, but also pose a potential threat to human health. Therefore, effective treatment of chlorine has become a necessary measure.

[0003] At present, the chlorine recovery and treatment device includes an alkali liquid pool and a spray tower. In the process of treating chlorine, the chlorine first enters the alkali liquid pool to react with the alkali liquid, and some of the overflowed chlorine then enters the spray tower to react with the alkali liquid sprayed from the spray tower to recover and treat the chlorine.

[0004] Since chlorine reacts directly with alkali solution with a slow reaction rate, part of the chlorine has passed through the alkali solution pool and spray tower before being reacted, resulting in a low chlorine recovery rate. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a chlorine recovery and treatment device, which can increase the reaction rate of chlorine and alkali solution, thereby increasing the recovery and treatment rate of chlorine.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A chlorine gas recovery and treatment device comprises a first spray tower, a second spray tower and a third spray tower, wherein the first spray tower is provided with a first air inlet and a first air outlet, and a water spraying device is further provided in the first spray tower for spraying water to the gas in the first spray tower; the second spray tower is provided with a second air inlet and a second air outlet, the second air inlet is connected to the first air outlet, and an alkali spraying device is provided in the second spray tower for spraying alkali liquid to the gas in the second spray tower; the third spray tower is provided with a third air inlet and a third air outlet, the third air inlet is connected to the second air outlet, and a liquid spraying device is provided in the third spray tower for spraying alkali liquid to the gas in the third spray tower.

[0008] Preferably, the water spraying equipment includes three water spraying pipes arranged in sequence from top to bottom along the height of the first spray tower, the height of the first air inlet is lower than the height of the three water spraying pipes, and the height of the first air outlet is higher than the height of the three water spraying pipes.

[0009] Preferably, the alkali spraying equipment comprises two alkali spraying pipes arranged in sequence from top to bottom along the height of the first spray tower, the height of the second air inlet is lower than the height of the two alkali spraying pipes, and the height of the second air outlet is higher than the height of the two alkali spraying pipes.

[0010] Preferably, the liquid spraying equipment comprises two liquid spraying pipes arranged in sequence from top to bottom along the height of the third spray tower, the height of the third air inlet is lower than the two liquid spraying pipes, and the height of the third air outlet is higher than the two liquid spraying pipes.

[0011] Preferably, each liquid spraying pipe is connected to the alkali spraying equipment, and the alkali spraying equipment is used to transport alkali liquid to the liquid spraying pipe.

[0012] Preferably, the liquid spraying pipe is connected to the inner bottom of the third spray tower to absorb the liquid at the inner bottom of the spray tower for spraying.

[0013] Preferably, the inner bottom of the first spray tower and the second spray tower are both provided with a water holding part, the heights of the first air inlet and the second air inlet are both higher than the corresponding water holding parts, and the water holding parts are used to hold the sprayed liquid; a cooling part is provided in the water holding part to cool the liquid in the water holding part and improve the absorption efficiency of chlorine recovery.

[0014] Preferably, the cooling unit comprises a condenser, a water inlet end and a water outlet end of the condenser are both connected to the outside, and condensed water enters the condenser from the water inlet end and exits from the water outlet end.

[0015] Preferably, the first spray tower, the second spray tower and the third spray tower are each provided with a spiral demister; the water spraying equipment, the alkali spraying equipment and the liquid spraying equipment are all located below the corresponding spiral demister, and the heights of the first air outlet, the second air outlet and the third air outlet are all higher than the corresponding spiral demister.

[0016] Preferably, a packing part is provided below each water spray pipe, each alkali spray pipe and each liquid spray pipe to disperse the sprayed liquid, accelerate the liquid to fully contact with the gas and absorb the chlorine.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] (1) The utility model sequentially sets up three interconnected spray towers. Chlorine gas first enters the first spray tower. The water spraying equipment in the first spray tower sprays water to the chlorine gas. The chlorine gas reacts with water to generate hypochlorous acid and hydrochloric acid. Part of the hypochlorous acid and hydrochloric acid will enter the second spray tower together with the chlorine gas. In the second spray tower, the alkali spraying equipment sprays alkali solution into the second spray tower. The hypochlorous acid, hydrochloric acid and chlorine gas in the second spray tower react with the alkali solution at a fast reaction rate. The recovery and treatment of chlorine gas is basically completed in the second spray tower. A very small part of chlorine gas will enter the third spray tower. The liquid spraying equipment sprays alkali solution to the chlorine gas again. Since the content of chlorine gas is relatively low, the chlorine gas can be fully reacted and recovered. The utility model improves the reaction rate of chlorine gas and alkali solution, thereby improving the recovery and treatment rate of chlorine gas.

[0019] (2) The utility model provides a water storage portion at the inner bottom of the first spray tower and the second spray tower to collect the spray liquid sprayed with the gas for reuse, thereby saving resources.

[0020] (3) In the present invention, since the reaction occurring in the first spray tower and the second spray tower generates heat, causing the temperature of the liquid in the water holding part to increase, the present application provides a cooling part in the water holding part to achieve the purpose of cooling and controlling the temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A cross-sectional view of the chlorine gas recovery and treatment device provided by the utility model;

[0022] Figure 2 A cross-sectional view of the first spray tower provided by the utility model;

[0023] Figure 3 A cross-sectional view of the second spray tower provided by the utility model;

[0024] Figure 4 This is a cross-sectional view of the third spray tower provided by the utility model.

[0025] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0026] Chlorine gas recovery and treatment device 100, first spray tower 1, first air inlet 11, first air outlet 12, water spray equipment 2, water spray pipe 21, second spray tower 3, second air inlet 31, second air outlet 32, alkali spray equipment 4, alkali spray pipe 41, third spray tower 5, third air inlet 51, third air outlet 52, liquid spray equipment 6, liquid spray pipe 61, water holding part 7, cooling part 8, spiral demister part 9, packing part 10. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with specific embodiments so that those skilled in the art can understand the present invention more clearly.

[0028] Combined with Figure 1-4 The present invention provides a chlorine gas recovery and treatment device 100, comprising a first spray tower 1, a second spray tower 3 and a third spray tower 5, wherein the first spray tower 1 is provided with a first air inlet 11 and a first air outlet 12, and a water spraying device 2 is further provided in the first spray tower 1 for spraying water to the gas in the first spray tower 1; the second spray tower 3 is provided with a second air inlet 31 and a second air outlet 32, the second air inlet 31 is connected to the first air outlet 12, and an alkali spraying device 4 is provided in the second spray tower 3 for spraying alkali liquid to the gas in the second spray tower 3; the third spray tower 5 is provided with a third air inlet 51 and a third air outlet 52, the third air inlet 51 is connected to the second air outlet 32, and a liquid spraying device 6 is provided in the third spray tower 5 for spraying alkali liquid to the gas in the third spray tower 5.

[0029] In the above technical solution, the communication between the first air outlet 12 and the second air inlet 31, and the second air outlet 32 ​​and the third air inlet 51 can be realized through a pipeline. In the present application, the specific structures of the water spraying equipment 2, the alkali spraying equipment 4 and the liquid spraying equipment 6 are not limited, as long as they can spray the corresponding liquid. Exemplarily, the first spray tower 1, the second spray tower 3 and the third spray tower 5 are all arranged vertically, the first air inlet 11, the second air inlet 31 and the third air inlet 51 are all located below the corresponding spray tower, and the first air outlet 12, the second air outlet 32 ​​and the third air outlet 52 are all located above the corresponding spray tower. This arrangement can slow down the flow speed of the gas in the corresponding spray tower and improve the reaction efficiency.

[0030] During use, the utility model sequentially sets three interconnected spray towers, chlorine first enters the first spray tower 1, the water spraying device 2 in the first spray tower 1 sprays water to the chlorine, chlorine reacts with water to generate hypochlorous acid and hydrochloric acid, part of the hypochlorous acid and hydrochloric acid will enter the second spray tower 3 together with the chlorine, in the second spray tower 3, the alkali spraying device 4 sprays alkali solution into the second spray tower 3, the hypochlorous acid, hydrochloric acid and chlorine in the second spray tower 3 react with the alkali solution, the reaction rate is fast, the recovery and treatment of chlorine is basically completed in the second spray tower 3, and a very small part of chlorine will enter the third spray tower 5, the liquid spraying device 6 sprays alkali solution to the chlorine again, because the content of chlorine is small, so the chlorine can be fully reacted and recovered. The utility model improves the reaction rate of chlorine and alkali solution, thereby improving the recovery and treatment rate of chlorine. It should be noted that, since the content of chlorine entering the third spray tower 5 is very small, the spraying amount of the alkali solution in the third spray tower 5 can be appropriately reduced or the concentration of the alkali solution can be reduced. In order to facilitate the acquisition, the alkali solution generally used is sodium hydroxide solution.

[0031] Further, the water spraying equipment 2 includes three water spraying pipes 21 arranged in sequence from top to bottom along the height of the first spray tower 1, the height of the first air inlet 11 is lower than the height of the three water spraying pipes 21, and the height of the first air outlet 12 is higher than the height of the three water spraying pipes 21. The gas enters from the first air inlet 11 and goes out from the first air outlet 12. Since the amount of chlorine in the first spray tower 1 is the largest, the three water spraying pipes 21 are set in order to fully react the chlorine with water. It should be noted that the present application does not limit the specific structure of each water spraying pipe 21. For example, each water spraying pipe 21 is a section of pipe body, and a plurality of water outlet holes are provided on the pipe body to flow out the water in the pipe body. In some embodiments, each water spraying pipe 21 is connected to a water pump body, or three water spraying pipes 21 are connected to the same water pump body.

[0032] In some embodiments, the alkali spraying equipment 4 includes two alkali spraying pipes 41 arranged in sequence from top to bottom along the height of the first spray tower 1, the height of the second air inlet 31 is lower than the height of the two alkali spraying pipes 41, and the height of the second air outlet 32 ​​is higher than the height of the two alkali spraying pipes 41. The gas enters the second spray tower 3 from the second air inlet 31 and goes out from the second air outlet 32. Since the amount of gas in the second spray tower 3 is less than the amount of gas in the first spray tower 1, it is not necessary to set three alkali spraying pipes 41, and only two alkali spraying pipes 41 are required. It should be noted that the specific structure of each alkali spraying pipe 41 does not need to be limited. For example, each alkali spraying pipe 41 is a section of pipe body, and a plurality of alkali liquid outlet holes are provided on the pipe body to discharge the alkali liquid in the pipe body. In some embodiments, each alkali spraying pipe 41 is connected to the alkali liquid pump body, or the two alkali spraying pipes 41 are connected to the same alkali liquid pump body.

[0033] Furthermore, the liquid spraying device 6 includes two liquid spraying pipes 61 which are arranged in sequence from top to bottom along the height of the third spray tower 5. The height of the third air inlet 51 is lower than the two liquid spraying pipes 61, and the height of the third air outlet 52 is higher than the two liquid spraying pipes 61. The gas enters from the third air inlet 51 and goes out from the third air outlet 52. Since less gas enters the third spray tower 5, it is not necessary to set three liquid spraying pipes 61, and only two are needed. It should be noted that the specific structure of each liquid spraying pipe 61 does not need to be limited. For example, each liquid spraying pipe 61 is a section of pipe body, and a plurality of liquid outlet holes are provided on the pipe body to discharge the liquid in the pipe body. In some embodiments, each liquid spraying pipe 61 is connected to a liquid pump body, or two liquid spraying pipes 61 are connected to the same liquid pump.

[0034] Furthermore, each liquid spraying pipe 61 is connected to the alkali spraying equipment 4, and the alkali spraying equipment 4 is used to transport alkali solution to the liquid spraying pipe 61. Exemplarily, the alkali spraying equipment 4 includes an alkali liquid pump body, the alkali spraying pipe 41 is connected to the alkali liquid pump, and the liquid spraying pipe 61 is connected to the alkali spraying pipe 41. When the alkali liquid pump transports alkali solution to the alkali spraying pipe 41, the alkali solution will also be transported to the liquid spraying pipe 61.

[0035] Furthermore, the liquid spraying pipe 61 is connected to the inner bottom of the third spray tower 5, absorbs the liquid at the inner bottom of the third spray tower 5 for spraying. By way of example, in some embodiments, a liquid pump is provided, and the liquid pump is connected to the liquid spraying pipe 61. The liquid falling from the liquid spraying pipe 61 is transported to the liquid spraying pipe 61 by the liquid pump, and can be recycled to save resources.

[0036] In the technical solution of the present invention, the inner bottom of each of the first spray tower 1 and the second spray tower 3 is provided with a water holding portion 7, and the heights of the first air inlet 11 and the second air inlet 31 are both higher than the corresponding water holding portion 7, and the water holding portion 7 is used to hold the liquid sprayed down; a cooling portion 8 is provided in the water holding portion 7 to cool the liquid in the water holding portion 7. In the first spray tower 1, water reacts with chlorine gas to generate heat, so the temperature of the water falling back into the water holding portion 7 is increased, and similarly in the second spray tower 1, the water and chlorine react to generate heat, so the temperature of the water falling back into the water holding portion 7 is increased. In the tower 3, hydrochloric acid and hypochlorous acid react with alkali solution, which will also generate heat, so the temperature of the water falling back into the water holding part 7 is also increased. A cooling part 8 is set in the water holding part 7 to cool the liquid. It should be noted that the present application does not limit the specific structure of the cooling part 8. For example, it can be a condenser tube for cooling through water, or a structure such as a conductor that can cool spontaneously. Since there are fewer reactions in the third spray tower 5 and the heat generation is extremely low, in order to save costs, a cooling part 8 is not set in the third spray tower 5. In some embodiments, the liquid after spraying falls back to the bottom of the corresponding spray tower. In order to prevent the liquid at the bottom of the spray tower from flooding the air inlet, an overflow port is set. In the first spray tower 1, it is a hypochlorous acid outlet, in the second spray tower 3, it is a sodium hypochlorite outlet, and in the third spray tower 5, it is a sodium hypochlorite outlet. At the same time, each spray tower is also provided with an emptying port, which is also a sewage outlet, so as to facilitate the emptying of waste liquid in the equipment during maintenance. In order to prevent the overflow and drain ports from being blocked, a filter screen may be provided to block larger impurities.

[0037] Specifically, the cooling unit 8 includes a condenser, a water inlet end and a water outlet end of the condenser are both connected to the outside, and condensed water enters the condenser from the water inlet end and exits from the water outlet end.

[0038] In the technical solution of the present application, a spiral defogger 9 is provided inside the first spray tower 1, the second spray tower 3 and the third spray tower 5; the water spraying equipment 2, the alkali spraying equipment 4 and the liquid spraying equipment 6 are all located below the corresponding spiral defogger 9, and the heights of the first air outlet 12, the second air outlet 32 ​​and the third air outlet 52 are all higher than the corresponding cyclone defogger 9. The cyclone defogger 9 is a conventional cyclone defogger layer, which is used to remove particulate matter such as water mist in the gas, thereby purifying the air.

[0039] Furthermore, a packing portion 10 is provided under each water spray pipe 21, each alkali spray pipe 41 and each liquid spray pipe 61 to disperse the sprayed liquid, wherein the packing portion 10 is a conventional packing layer that can disperse the sprayed liquid so that the liquid and gas can fully contact, absorb and purify.

[0040] In some embodiments, in order to prevent the first air outlet 12, the second air outlet 32 ​​and the third air outlet 52 from being blocked, a filter may be provided on each air outlet to filter out large-size particles.

[0041] Usage process: chlorine first enters the first spray tower 1, the water spraying device 2 in the first spray tower 1 sprays water to the chlorine, chlorine reacts with water to generate hypochlorous acid and hydrochloric acid, part of the hypochlorous acid and hydrochloric acid will enter the second spray tower 3 together with the chlorine, in the second spray tower 3, the alkali spraying device 4 sprays alkali solution into the second spray tower 3, the hypochlorous acid, hydrochloric acid and chlorine in the second spray tower 3 react with the alkali solution, the reaction rate is fast, and the recovery and treatment of chlorine is basically completed in the second spray tower 3, and a very small part of chlorine will enter the third spray tower 5, the liquid spraying device 6 sprays alkali solution to the chlorine again, because the content of chlorine is small, so the chlorine can be fully reacted and recovered. This new type improves the reaction rate of chlorine and alkali solution, thereby improving the recovery and treatment rate of chlorine.

[0042] The mechanisms, components and parts not specifically described in the present invention are all existing structures in the prior art and can be directly purchased from the market.

[0043] The above is only a preferred embodiment of the utility model, and is not intended to limit the protection scope of the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A chlorine gas recovery and treatment device, characterized in that: include: A first spray tower is provided with a first air inlet and a first air outlet, and a water spraying device is also provided in the first spray tower for spraying water to the gas in the first spray tower; A second spray tower is provided with a second air inlet and a second air outlet, wherein the second air inlet is connected to the first air outlet, and an alkali spraying device is provided in the second spray tower for spraying alkali liquid to the gas in the second spray tower; The third spray tower is provided with a third air inlet and a third air outlet, wherein the third air inlet is connected to the second air outlet, and a liquid spraying device is provided in the third spray tower for spraying alkali liquid to the gas in the third spray tower.

2. The chlorine gas recovery and treatment device according to claim 1, characterized in that: The water spraying equipment includes three water spraying pipes arranged in sequence from top to bottom along the height of the first spray tower, the height of the first air inlet is lower than the height of the three water spraying pipes, and the height of the first air outlet is higher than the height of the three water spraying pipes.

3. The chlorine gas recovery and treatment device according to claim 2, characterized in that: The alkali spraying equipment includes two alkali spraying pipes arranged in sequence from top to bottom along the height of the first spray tower, the height of the second air inlet is lower than the height of the two alkali spraying pipes, and the height of the second air outlet is higher than the height of the two alkali spraying pipes.

4. The chlorine gas recovery and treatment device according to claim 3, characterized in that: The liquid spraying device includes two liquid spraying pipes arranged in sequence from top to bottom along the height of the third spray tower, the height of the third air inlet is lower than the two liquid spraying pipes, and the height of the third air outlet is higher than the two liquid spraying pipes.

5. The chlorine gas recovery and treatment device according to claim 4, characterized in that: Each liquid spraying pipe is connected to the alkali spraying equipment, and the alkali spraying equipment is used to transport alkali solution to the liquid spraying pipe.

6. The chlorine gas recovery and treatment device according to claim 5, characterized in that: The liquid spraying pipe is communicated with the inner bottom of the third spray tower to absorb the liquid at the inner bottom of the spray tower for spraying.

7. The chlorine gas recovery and treatment device according to claim 1, characterized in that: The inner bottom of the first spray tower and the second spray tower are both provided with a water holding part, the height of the first air inlet and the second air inlet are both higher than the corresponding water holding part, and the water holding part is used to hold the sprayed liquid; A cooling part is provided in the water holding part for cooling the liquid in the water holding part.

8. The chlorine gas recovery and treatment device according to claim 7, characterized in that: The cooling part comprises a condenser, a water inlet end and a water outlet end of the condenser are both connected to the outside, and condensed water enters the condenser from the water inlet end and exits from the water outlet end.

9. The chlorine gas recovery and treatment device according to claim 1, characterized in that: The first spray tower, the second spray tower and the third spray tower are all provided with a spiral demister inside; The water spraying device, the alkali spraying device and the liquid spraying device are all located below the corresponding spiral defogger, and the heights of the first air outlet, the second air outlet and the third air outlet are all higher than the corresponding spiral defogger.

10. The chlorine gas recovery and treatment device according to claim 4, characterized in that: A packing part is arranged under each water spray pipe, each alkali spray pipe and each liquid spray pipe to disperse the sprayed liquid, accelerate the liquid to fully contact with the gas and absorb the chlorine.

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