Tail gas purification multi-stage spray tower

Abstract

The utility model provides a tail gas purification multi-stage spray tower. The tail gas purification multi-stage spray tower comprises a tower body, three sets of circulating spray systems and a U-shaped communicating pipe, the tower body is hollow and is internally provided with two partition plates to divide the tower body into upper, middle and lower spraying areas, the top is provided with an exhaust port, and the bottom is provided with a tail gas input pipe. And the three sets of circulating spraying systems are respectively arranged in three spraying areas, namely water spraying, alkaline solution spraying and oxidant solution spraying from bottom to top in sequence. The U-shaped communicating pipe is inversely arranged on the partition plate, the input end is communicated with the lower side spraying area, the output end is communicated with the upper side and arranged downwards, and the distance between the U-shaped communicating pipe and the partition plate is larger than 50 cm. Tail gas enters the tower body through the tail gas input pipe and is sequentially subjected to three-stage spraying treatment, water-soluble pollutants, solid particles, acid gas and refractory pollutants are effectively removed, and the purified gas is exhausted from the exhaust port. According to the spray tower, the purification effect is improved through multi-stage spraying and unique communicating pipe design.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas treatment technology, and in particular to a multi-stage spray tower for exhaust gas purification. Background Technology

[0002] During industrial production, various production equipment emits large amounts of exhaust gases containing pollutants. These exhaust gases often include water-soluble pollutants, particulate matter, acidic gases (such as SO2 and NOx), and persistent pollutants (such as VOCs). Directly releasing these exhaust gases into the atmosphere will not only severely pollute air quality, affecting the ecological environment and human health, but may also violate relevant environmental protection regulations, bringing legal risks and adverse social impacts to enterprises.

[0003] Currently, exhaust gas purification technologies are constantly developing, with spray towers being a common type of exhaust gas purification equipment widely used in industrial exhaust gas treatment. However, traditional spray towers mostly adopt a single-stage spraying method, meaning they only have one spraying area and one spraying system, using a single type of spray liquid to treat the exhaust gas. This single-stage spraying method has limitations: because the spray liquid is of a single type, it is difficult to effectively remove multiple different types of pollutants in the exhaust gas simultaneously, resulting in unsatisfactory exhaust gas purification effects. The treated exhaust gas may still contain high concentrations of harmful substances, failing to meet increasingly stringent environmental emission standards. Utility Model Content

[0004] The purpose of this invention is to provide a multi-stage spray tower for exhaust gas purification, which solves the technical problem of poor exhaust gas purification effect of traditional single-stage spray towers.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a multi-stage exhaust gas purification spray tower, the multi-stage exhaust gas purification spray tower comprising:

[0006] The tower body is hollow and has two partition plates inside, which divide the tower body into three spray zones: upper, middle, and lower. An exhaust port is provided at the top of the tower body, and an exhaust gas inlet pipe is provided at the bottom of the tower body.

[0007] Three sets of circulating spray systems are respectively set on the upper, middle and lower spray areas. The three sets of circulating spray systems are arranged from bottom to top as water spray, alkaline solution spray and oxidant solution spray.

[0008] A U-shaped connecting pipe is disposed on the partition plate. The U-shaped connecting pipe is inverted. The input end of the U-shaped connecting pipe is connected to the spray area on the lower side of the partition plate, and the output end of the U-shaped connecting pipe is connected to the spray area on the upper side of the partition plate. The output end of the U-shaped connecting pipe is set downward, and the distance between the output end of the U-shaped connecting pipe and the partition plate is greater than 50cm.

[0009] In one embodiment, the circulating spray system includes:

[0010] A circulation pipe, wherein the input end of the circulation pipe is located at the bottom of the spray area, and the output end of the circulation pipe is located at the top of the spray area;

[0011] An atomizing nozzle is disposed at the output end of the circulation pipe, and the atomizing nozzle is disposed downward;

[0012] A circulation pump is installed on the circulation pipeline.

[0013] In one embodiment, a filter screen is provided at the inlet of the circulation pipe.

[0014] In one embodiment, the output end of the circulation pipe has a circular structure, and the atomizing nozzles are evenly distributed on the output end of the circulation pipe.

[0015] In one embodiment, an automatic dosing mechanism is further included. The automatic dosing mechanism is disposed on the circulation pipes of the two circulating spray systems mentioned above. The automatic dosing mechanism includes a dosing tank and a metering valve. The dosing tank is pre-filled with dosing, and the bottom outlet of the dosing tank is connected to the circulation pipe through a pipe. The metering valve is disposed on the pipe connecting the dosing tank and the circulation pipe.

[0016] In one embodiment, the system further includes an exhaust gas dispersion pipe, which has a circular structure and outlets evenly distributed at its bottom. One end of the exhaust gas dispersion pipe is connected to the output end of the exhaust gas input pipe or the U-shaped connecting pipe.

[0017] In one embodiment, a demister is provided on the exhaust port of the tower body.

[0018] The above-described technical solutions in the embodiments of this utility model have at least the following technical effects or advantages:

[0019] The multi-stage spray tower for exhaust gas purification provided in this embodiment of the invention divides the tower body into three spray zones (upper, middle, and lower) by installing a partition plate. Each of the three spray zones is equipped with a circulating spray system, which, from bottom to top, consists of water spray, alkaline solution spray, and oxidant solution spray. This three-stage spray design can target different types of pollutants in the exhaust gas for specific treatment: the lower water spray quickly absorbs and removes water-soluble pollutants and solid particles, creating favorable conditions for subsequent reactions; the middle alkaline solution spray uses alkaline agents to neutralize acidic gases (SO2, NOx) in the exhaust gas, effectively removing harmful acidic gases; and the upper oxidant solution spray uses oxidants to promote the oxidative decomposition of recalcitrant pollutants (such as VOCs) in the exhaust gas, further deepening the treatment of the exhaust gas. This multi-stage, layered purification method significantly improves the removal efficiency of various pollutants in the exhaust gas, ensuring that the treated exhaust gas meets higher environmental emission standards and effectively reducing atmospheric pollution.

[0020] Furthermore, each spray zone is connected by an inverted U-shaped connecting pipe, with the output end of the U-shaped connecting pipe facing downwards and the distance between it and the partition plate greater than 50cm. This effectively prevents the liquid sprayed from the upper-level circulating spray system from flowing along the U-shaped connecting pipe to the lower-level spray zone, ensuring the independence and stability of the spray liquid in each spray zone. This ensures that the purification reactions at different stages can proceed smoothly without interference, fully utilizing the purification effect of each level of the spray system. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art 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.

[0022] Figure 1 This is a schematic diagram of the structure of the multi-stage spray tower for exhaust gas purification provided in an embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram of the internal structure of the multi-stage spray tower for exhaust gas purification provided in an embodiment of this utility model.

[0024] The labels for the various figures are as follows:

[0025] 1. Tower body; 2. Circulating spray system; 3. U-shaped connecting pipe; 4. Automatic reagent addition mechanism; 5. Tail gas dispersion pipe; 6. Demister; 11. Divider plate; 12. Exhaust port; 13. Tail gas inlet pipe; 14. Tail gas delivery pump; 21. Circulating pipeline; 22. Atomizing nozzle; 23. Circulating pump; 24. Filter screen; 41. Reagent tank; 42. Metering valve. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0027] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] Please see Figures 1 to 2This application provides a multi-stage exhaust gas purification spray tower, including a tower body 1, three sets of circulating spray systems 2, and a U-shaped connecting pipe 3. The tower body 1 is hollow, and two partition plates 11 are installed inside the tower body 1, dividing the tower body 1 into three spray areas: upper, middle, and lower. An exhaust port 12 is provided at the top of the tower body 1, and an exhaust gas inlet pipe 13 is provided at the bottom of the tower body 1. The three sets of circulating spray systems 2 are respectively installed on the upper, middle, and lower spray areas, and the three sets of circulating spray systems 2 are arranged from bottom to top as water spray, alkaline solution spray, and oxidant solution spray. The U-shaped connecting pipe 3 is installed on the partition plates 11, and the U-shaped connecting pipe 3 is inverted. The input end of the U-shaped connecting pipe 3 connects to the spray area on the lower side of the partition plate 11, and the output end of the U-shaped connecting pipe 3 connects to the spray area on the upper side of the partition plate 11. The output end of the U-shaped connecting pipe 3 is set downward, and the distance between the output end of the U-shaped connecting pipe 3 and the partition plate 11 is greater than 50 cm.

[0031] This invention divides the tower body 1 into three spray zones (upper, middle, and lower) by installing a partition plate 11 inside the tower body 1. A circulating spray system 2 is installed in each of the three spray zones, with water spray, alkaline solution spray, and oxidant solution spray arranged sequentially from bottom to top. The spray zones are connected by a U-shaped connecting pipe 3. When the exhaust gas is pumped into the tower body 1 by the exhaust gas delivery pump 14 on the exhaust gas inlet pipe 13, it flows upward and counteracts the water mist sprayed by the lower circulating spray system 2, thus quickly absorbing and removing water-soluble pollutants and solid particles from the exhaust gas, creating conditions for subsequent reactions. The exhaust gas then enters the middle spray zone through the U-shaped connecting pipe 3. As it flows upward, it counteracts the water mist sprayed by the middle circulating spray system 2, utilizing the alkaline agent (specifically NaOH or Ca(OH)2) in the water mist to neutralize the acidic gases (SO2, NOx) in the exhaust gas, removing the acidic harmful gases. The exhaust gas then enters the upper spray area via the U-shaped connecting pipe 3. As the exhaust gas flows upward, it is counteracted by the water mist sprayed from the upper circulating spray system 2. The oxidant in the water mist (specifically H2O2 or NaClO) promotes the oxidation and decomposition of recalcitrant pollutants (such as VOCs) in the exhaust gas, further treating the exhaust gas. The treated exhaust gas is then discharged from the exhaust port 12 at the top of the tower. By setting up a three-stage spray system to treat the exhaust gas, the purification effect is improved. In addition, the various spray areas are connected by an inverted U-shaped connecting pipe 3, and the output end of the U-shaped connecting pipe 3 is set downward. The distance between the U-shaped connecting pipe 3 and the partition plate 11 is greater than 50cm, so that the liquid sprayed from the upper circulating spray system 2 will not flow along the U-shaped connecting pipe 3 into the lower spray area.

[0032] Optionally, a drain pipe and a water supply pipe (connected to a tap water pipe) can be installed in each spraying area. When the spraying tower needs to be replaced after a long period of use, simply open the valve on the drain pipe at the bottom of the spraying area to drain the spraying liquid in the spraying area, and then open the valve on the water supply pipe to refill the spraying area with spraying liquid.

[0033] A detection device is also installed at the top of the exhaust port 12 at the top of the tower body 1. This detection device is used to detect whether the exhaust gas meets the standards. Furthermore, the detection device is electrically connected to the exhaust gas delivery pump 14. When the detection device detects that the exhaust gas does not meet the emission standards, the detection device controls the exhaust gas delivery pump 14 to stop working and closes the exhaust gas input pipe 13 to prevent the continuous emission of non-compliant exhaust gas.

[0034] To improve sealing, a sealing ring can be installed between the U-shaped connecting pipe 3 and the partition plate 11 to enhance the sealing between them.

[0035] In one embodiment, the circulating spray system 2 includes a circulating pipe 21, an atomizing nozzle 22, and a circulating pump 23. The inlet of the circulating pipe 21 is located at the bottom of the spray area, and the outlet of the circulating pipe 21 is located at the top of the spray area. The atomizing nozzle 22 is located at the outlet of the circulating pipe 21, facing downwards. The circulating pump 23 is mounted on the circulating pipe 21. During spraying, the circulating pump 23 pumps the spray liquid from the bottom of the spray area to the outlet of the circulating pipe 21. After being atomized by the atomizing nozzle 22, it is sprayed downwards. The atomization effect of the atomizing nozzle 22 ensures that the spray liquid is fully dispersed, increasing the probability of contact with the exhaust gas and thus improving the purification effect. The specific models of the atomizing nozzle 22 and the circulating pump 23 can be changed according to the usage requirements and are not limited here.

[0036] In one embodiment, a filter screen 24 is provided at the inlet end of the circulation pipe 21. The filter screen 24 can filter the spray liquid entering the circulation pipe 21 to prevent large solid particles from entering the circulation pipe 21 and causing blockage of the atomizing nozzle 22.

[0037] In one embodiment, the output end of the circulation pipe 21 has a circular structure, and the atomizing nozzles 22 are evenly distributed on the output end of the circulation pipe 21. The evenly distributed atomizing nozzles 22 make the spray liquid form fine and uniform droplets, which increases the contact area between the spray liquid and the exhaust gas, accelerates the chemical reaction, and thus improves the purification efficiency of various pollutants in the exhaust gas.

[0038] In one embodiment, it also includes an automatic drug addition mechanism 4, which is disposed on the circulation pipe 21 of the two circulating spray systems 2. The automatic drug addition mechanism 4 includes a drug tank 41 and a metering valve 42. The drug tank 41 is pre-filled with drug, and the bottom outlet of the drug tank 41 is connected to the circulation pipe 21 through a pipe. The metering valve 42 is disposed on the pipe connecting the drug tank 41 and the circulation pipe 21.

[0039] An automatic reagent addition mechanism 4 is installed on the circulation pipe 21 of the circulating spray system 2, and the metering valve 42 therein can precisely control the amount of reagent added. For the upper oxidant solution spray system and the middle alkaline solution spray system, the pollutant content in the exhaust gas may fluctuate under different operating conditions. Precise reagent addition can ensure that the concentration of oxidant and alkaline reagents in the circulating spray liquid is always maintained within a suitable range, so that the neutralization reaction of acidic gases (such as SO2, NOx) in the exhaust gas with alkaline reagents and the oxidative decomposition reaction of recalcitrant pollutants (such as VOCs) with oxidants can proceed continuously and stably, effectively ensuring the removal effect of various pollutants and avoiding poor purification effect due to unstable reagent concentration. Specifically, the metering valve 42 can be a KGK series metering valve 42.

[0040] In one embodiment, the system further includes an exhaust gas dispersion pipe 5, which has a circular structure and outlets evenly distributed at its bottom. One end of the exhaust gas dispersion pipe 5 is connected to the output end of the exhaust gas inlet pipe 13 or the U-shaped connecting pipe 3.

[0041] The exhaust gas dispersion pipe 5 has a circular structure and outlets are evenly distributed at the bottom. When the exhaust gas enters the exhaust gas dispersion pipe 5 through the exhaust gas inlet pipe 13 or the output end of the U-shaped connecting pipe, it can flow out from the evenly distributed outlets at the bottom, making the exhaust gas more evenly distributed when entering the spray area. This avoids the phenomenon of insufficient purification caused by the exhaust gas concentrating in a certain area, and ensures that the exhaust gas and the spray liquid are fully mixed and reacted in the spray area, thereby improving the quality and effect of exhaust gas purification.

[0042] In one embodiment, a demister 6 is installed on the exhaust port 12 of the tower body 1. Installing the demister 6 on the exhaust port 12 of the tower body 1 can effectively intercept and remove droplets carried in the purified exhaust gas. During the spraying process, the exhaust gas, upon contact with the spray liquid, carries a certain amount of droplets that rise to the exhaust port 12. If these droplets are directly discharged into the atmosphere with the exhaust gas, it will not only waste the spray liquid but may also lead to secondary pollution. The demister 6 can prevent this from happening, ensuring that the exhaust gas discharged into the atmosphere is dry and clean. The demister 6 can specifically be a wire mesh demister 6, a baffle plate demister 6, etc.

[0043] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-stage spray tower for exhaust gas purification, characterized in that, The multi-stage exhaust gas purification spray tower includes: The tower body is hollow and has two partition plates inside, which divide the tower body into three spray zones: upper, middle, and lower. An exhaust port is provided at the top of the tower body, and an exhaust gas inlet pipe is provided at the bottom of the tower body. Three sets of circulating spray systems are respectively set on the upper, middle and lower spray areas. The three sets of circulating spray systems are arranged from bottom to top as water spray, alkaline solution spray and oxidant solution spray. A U-shaped connecting pipe is disposed on the partition plate. The U-shaped connecting pipe is inverted. The input end of the U-shaped connecting pipe is connected to the spray area on the lower side of the partition plate, and the output end of the U-shaped connecting pipe is connected to the spray area on the upper side of the partition plate. The output end of the U-shaped connecting pipe is set downward, and the distance between the output end of the U-shaped connecting pipe and the partition plate is greater than 50cm.

2. The multi-stage spray tower for exhaust gas purification according to claim 1, characterized in that, The circulating spray system includes: A circulation pipe, wherein the input end of the circulation pipe is located at the bottom of the spray area, and the output end of the circulation pipe is located at the top of the spray area; An atomizing nozzle is disposed at the output end of the circulation pipe, and the atomizing nozzle is disposed downward; A circulation pump is installed on the circulation pipeline.

3. The multi-stage spray tower for exhaust gas purification according to claim 2, characterized in that: A filter screen is installed at the inlet end of the circulation pipe.

4. The multi-stage spray tower for exhaust gas purification according to claim 2, characterized in that: The output end of the circulation pipe has a circular structure, and the atomizing nozzles are evenly distributed on the output end of the circulation pipe.

5. The multi-stage spray tower for exhaust gas purification according to claim 2, characterized in that: It also includes an automatic pesticide addition mechanism, which is installed on the circulation pipes of the two circulating spray systems mentioned above. The automatic pesticide addition mechanism includes a pesticide tank and a metering valve. The pesticide tank is pre-filled with pesticide, and the bottom outlet of the pesticide tank is connected to the circulation pipe through a pipe. The metering valve is installed on the pipe connecting the pesticide tank and the circulation pipe.

6. The multi-stage spray tower for exhaust gas purification according to claim 1, characterized in that: It also includes an exhaust gas dispersion pipe, which has a circular structure and outlets evenly distributed at the bottom. One end of the exhaust gas dispersion pipe is connected to the output end of the exhaust gas input pipe or the U-shaped connecting pipe.

7. The multi-stage spray tower for exhaust gas purification according to claim 1, characterized in that: A demister is installed on the exhaust port of the tower.

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