Dioxin removal device

Abstract

The dioxin removal device comprises a waste gas inlet, a water washing tower, an adsorption tank and an electric heater, the waste gas inlet is used for receiving waste gas and communicated with an external waste gas outlet, a gas inlet of the water washing tower is communicated with the waste gas inlet, and a gas outlet of the water washing tower is communicated with the adsorption tank. The water scrubber is used for retaining solid impurities and at least one part of dioxin in the waste gas, an alkaline solution is loaded in the water scrubber, and the alkaline solution can promote the dechlorination reaction of the dioxin, destroy the benzene ring structure of the dioxin and generate a low-toxicity product. A gas inlet of the adsorption tank is communicated with a gas outlet of the water scrubber, the adsorption tank is used for adsorbing at least one part of dioxin in the waste gas, and an adsorption material in the adsorption tank generally selects activated carbon, and can select sulfur modified activated carbon and chlorine modified activated carbon. A gas inlet of the electric heater is communicated with a gas outlet of the adsorption tank, a gas outlet of the electric heater is communicated with the outside, and the electric heater is used for heating and decomposing dioxin in waste gas.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection, and in particular to a dioxin removal device. Background Technology

[0002] Dioxins are persistent organic pollutants with high toxicity, environmental persistence, and bioaccumulation.

[0003] Currently, activated carbon adsorption is commonly used to remove dioxins from waste gas. However, relying solely on activated carbon adsorption is often insufficient to remove dioxins from waste gas and enable it to meet emission standards. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a dioxin removal device that can combine multiple dioxin removal processes.

[0005] A dioxin removal device according to an embodiment of the present invention includes: an exhaust gas inlet, a water scrubbing tower, an adsorption tower, and an electric heater. The exhaust gas inlet receives exhaust gas; the inlet of the water scrubbing tower is connected to the exhaust gas inlet, and the water scrubbing tower is used to retain solid impurities and at least a portion of dioxins in the exhaust gas; the inlet of the adsorption tower is connected to the exhaust port of the water scrubbing tower, and the adsorption tower is used to adsorb dioxins in the exhaust gas; the inlet of the electric heater is connected to the exhaust port of the adsorption tower, and the exhaust port of the electric heater is connected to the outside, and the electric heater is used to heat and decompose at least a portion of the dioxins in the exhaust gas. The three dioxin removal devices—the water scrubbing tower, the adsorption tower, and the electric heater—combine to effectively remove dioxins from the exhaust gas, enabling the exhaust gas to meet emission standards.

[0006] It has at least the following beneficial effects: the exhaust gas inlet is used to receive the exhaust gas from the combustion device into this removal device; the water washing tower is used to wash the solid impurities in the exhaust gas and decompose some of the dioxins; the adsorption tower is used to adsorb some of the dioxins in the exhaust gas; the electric heater is used to heat the exhaust gas discharged from the exhaust port of the adsorption tower to decompose the residual dioxins in the exhaust gas; the water washing tower, the adsorption tower and the electric heater work together to remove dioxins from the exhaust gas; after a series of purification processes, the dioxin content in the exhaust gas meets the standards and can meet the emission standards.

[0007] According to some embodiments of the present invention, a buffer tank is also included. The air inlet of the buffer tank is connected to the exhaust port of the water washing tower, and the exhaust port of the buffer tank is connected to the air inlet of the adsorption tower. The buffer tank is used to stabilize the gas pressure and regulate the gas flow rate.

[0008] According to some embodiments of this utility model, multiple adsorption towers are arranged in parallel, and the multiple adsorption towers are used to increase working efficiency.

[0009] According to some embodiments of the present invention, it further includes a first switching valve, wherein multiple first switching valves are provided, the air inlets of the multiple first switching valves are connected in parallel to the exhaust port of the buffer tank, each first switching valve is connected in series with an adsorption tower, and the exhaust port of the first switching valve is connected to the air inlet of the adsorption tower.

[0010] According to some embodiments of the present invention, a first safety valve is provided on the first switching valve, and multiple first safety valves are provided. One first safety valve is connected in series with one first switching valve, the air inlet of the first safety valve is connected to the air outlet of the first switching valve, and multiple first safety valves are connected in parallel with their air outlets connected to the outside.

[0011] According to some embodiments of the present invention, a second switching valve is also included. Multiple second switching valves are provided, each of which corresponds to one of the adsorption towers connected in series. The air inlet of the second switching valve is connected to the exhaust port of the adsorption tower. Multiple second switching valves are connected in parallel and their exhaust ports are connected to the air inlet of the electric heater.

[0012] According to some embodiments of this utility model, it also includes a second safety valve, wherein multiple second safety valves are provided, one second safety valve is connected in parallel with one second switching valve, the air inlet of the second safety valve is connected to the exhaust port of the adsorption tower, and multiple second safety valves are connected in parallel with their exhaust ports connected to the outside.

[0013] According to some embodiments of this utility model, a third safety valve is connected to the buffer tank, one end of the third safety valve is connected to the outside, and the other end of the third safety valve is connected to the outside.

[0014] According to some embodiments of the present invention, the water washing tower includes a reflux device, which is disposed on the periphery of the water washing tower, and the liquid flowing in the reflux device is an alkaline liquid.

[0015] According to some embodiments of the present invention, the reflux device is provided with a heat exchanger, which is used to heat the alkaline liquid in the reflux device.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0018] Figure 1This is a schematic diagram of the structure of a dioxin removal device according to an embodiment of the present invention;

[0019] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0020] Figure 3 for Figure 1 A partially enlarged view of a dioxin removal device B;

[0021] Reference numerals: Exhaust gas inlet 100;

[0022] Water washing tower 200, reflux device 210, heat exchanger 211;

[0023] Adsorption tower 300;

[0024] Electric heater 400;

[0025] Buffer tank 500, third safety valve 510;

[0026] First switching valve 600, first safety valve 610;

[0027] Second switching valve 700, second safety valve 710. Detailed Implementation

[0028] In the description of this utility model, the use of "first" and "second" is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features or the order of the technical features.

[0029] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0030] Reference Figures 1 to 3 This utility model discloses a dioxin removal device, comprising: a waste gas inlet 100, a water washing tower 200, an adsorption tower 300, and an electric heater 400.

[0031] Reference Figure 1 The exhaust gas inlet 100 is used to receive exhaust gas, and the exhaust gas inlet 100 is connected to the exhaust gas outlet of the outside.

[0032] Reference Figure 1 The inlet of the water scrubbing tower 200 is connected to the exhaust gas inlet 100. The water scrubbing tower 200 is used to retain solid impurities in the exhaust gas and remove at least a portion of the dioxins. The water scrubbing tower 200 is filled with an alkaline solution, which can promote the dechlorination reaction of dioxins, destroy their benzene ring structure, and generate products with lower toxicity.

[0033] Reference Figure 1 The air inlet of the adsorption tower 300 is connected to the exhaust outlet of the water washing tower 200. The adsorption tower 300 is used to adsorb at least a portion of the dioxins in the waste gas. The adsorption material in the adsorption tower 300 is generally activated carbon, which can be sulfur-modified activated carbon or chlorine-modified activated carbon. Sulfur-modified activated carbon and chlorine-modified activated carbon introduce sulfur-containing or nitrogen-containing functional groups on the surface of activated carbon through chemical modification, forming stronger chemical bonds with the chlorine atoms of dioxins, such as charge transfer complexes, thereby improving the adsorption capacity for low-volatility dioxins such as OCDD. Meanwhile, the adsorbent loaded with copper oxide or vanadium oxide can catalyze the decomposition of dioxins, achieving a synergistic effect of adsorption and degradation.

[0034] Reference Figure 1 The inlet of the electric heater 400 is connected to the outlet of the adsorption tower 300, and the outlet of the electric heater 400 is connected to the outside. The electric heater 400 is used to heat and decompose dioxins in the waste gas. The benzene ring and C-Cl bond of dioxins begin to break at temperatures above 850°C and need to be held for more than 2 seconds to ensure that they are decomposed into small molecules such as CO2, H2O, and HCl.

[0035] In some embodiments, refer to Figure 1 The present invention discloses a dioxin removal device, which also includes a buffer tank 500. The air inlet of the buffer tank 500 is connected to the exhaust port of the water washing tower 200, and the exhaust port of the buffer tank 500 is connected to the air inlet of the adsorption tower 300. The buffer tank 500 is used to stabilize the gas pressure and regulate the gas flow. It can be understood that the buffer tank 500 can not only buffer the gas pressure and regulate the gas flow, but also precipitate and discharge the water and some unremoved particulate matter in the waste gas transported from the water washing tower 200. The buffer tank 500 can also be set as other devices with gas buffering functions, such as spiral pipeline buffers and intelligent buffering systems.

[0036] In some embodiments, refer to Figure 1 Multiple adsorption towers 300 are connected in parallel to increase working efficiency. Generally, two adsorption towers 300 are set up, and the two adsorption towers 300 work alternately. Each adsorption tower 300 is set to rotate once every 8 hours to improve working efficiency.

[0037] In some embodiments, refer to Figure 1 and Figure 3This utility model discloses a dioxin removal device, which also includes a first switching valve 600. Multiple first switching valves 600 are provided, and the multiple first switching valves 600 are connected in parallel with their inlets connected to the exhaust ports of the buffer tank 500. Each first switching valve 600 corresponds to an adsorption tower 300 connected in series. The exhaust port of the first switching valve 600 is connected to the inlet of the adsorption tower 300. It can be understood that one switching valve controls the gas passage or cut-off of one adsorption tower 300. Two first switching valves 600 are provided, and a controller is provided on the switching valve. The valve is switched once every 8 hours, so that the device can treat dioxins in the waste gas continuously.

[0038] In some embodiments, refer to Figure 1 and Figure 3 The first switching valve 600 is equipped with a first safety valve 610. Multiple first safety valves 610 are provided. One first safety valve 610 is connected in series with one first switching valve 600. The air inlet of the first safety valve 610 is connected to the exhaust port of the first switching valve 600. Multiple first safety valves 610 are connected in parallel and their exhaust ports are connected to the outside. It can be understood that there are two first safety valves 610, and one first safety valve 610 controls one first switching valve 600. The setting of the first safety valve 610 ensures that when the adsorption tower 300 fails, the waste gas can be discharged to the outside through the first safety valve 610 to prevent the device from being damaged or causing an accident due to high pressure.

[0039] In some embodiments, refer to Figure 1 and Figure 3 The present invention discloses a dioxin removal device, which also includes a second switching valve 700. Multiple second switching valves 700 are provided, and each second switching valve 700 corresponds to an adsorption tower 300 connected in series. The air inlet of the second switching valve 700 is connected to the exhaust port of the adsorption tower 300. Multiple second switching valves 700 are connected in parallel and their exhaust ports are connected to the air inlet of the electric heater 400. It can be understood that there are two second switching valves 700, and one second switching valve 700 controls one adsorption tower 300. The first switching valve 600 and the second switching valve 700 connected in series in the same adsorption tower 300 are synchronously switched.

[0040] In some embodiments, refer to Figure 1 and Figure 3The second switching valve 700 is equipped with a second safety valve 710. There are multiple second safety valves 710, with one second safety valve 710 connected in parallel with one second switching valve 700. The air inlet of the second safety valve 710 is connected to the exhaust port of the adsorption tower 300. Multiple second safety valves 710 are connected in parallel and their exhaust ports are connected to the outside. It can be understood that there are two second safety valves 710, with one second safety valve 710 controlling one second switching valve 700. The setting of the second safety valve 710 ensures that when the electric heater 400 fails, the waste gas can be discharged to the outside through the second safety valve 710 to prevent damage to the device and accidents caused by high pressure.

[0041] Understandably, referring to Figure 1 The buffer tank 500 is connected to a third safety valve 510. One end of the third safety valve 510 is connected to the outside, and the other end is connected to the outside. The third safety valve 510 can not only ensure that the buffer tank 500 can be depressurized in case of failure, but also, when the exhaust gas buffers the gas pressure and regulates the gas flow in the buffer tank 500, some moisture and solid particles will be deposited in the buffer tank 500. The third safety valve 510 can also discharge the deposited moisture and solid particles from the buffer tank 500. Generally, the third safety valve 510 is set at the bottom of the buffer tank 500 so that the deposited moisture and solid particles can be discharged from the buffer tank 500 by their own gravity.

[0042] It should be noted that, referring to Figure 1 and Figure 2 The water washing tower 200 includes a reflux device 210, which is located on the periphery of the water washing tower 200. The liquid flowing in the reflux device 210 is an alkaline liquid, which is generally NaOH. The alkaline liquid can promote the dechlorination reaction of dioxins, destroy their benzene ring structure, and generate products with lower toxicity.

[0043] It should be considered that, with reference Figure 1 and Figure 2 The reflux device 210 is equipped with a heat exchanger 211, which is used to heat the alkaline liquid in the reflux device 210. It should be noted that the alkaline liquid is more effective at decomposing dioxins under high temperature conditions, especially in environments with temperatures above 80°C.

[0044] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A dioxin removal device, characterized in that, include: The exhaust gas inlet (100) is used to receive exhaust gas; A water scrubbing tower (200) has its air inlet connected to the exhaust gas inlet (100). The water scrubbing tower (200) is used to retain solid impurities and at least a portion of dioxins in the exhaust gas. An adsorption tower (300) is provided, the inlet of which is connected to the outlet of the water washing tower (200), and the adsorption tower (300) is used to adsorb at least a portion of the dioxins in the waste gas. An electric heater (400) is provided, the inlet of which is connected to the outlet of the adsorption tower (300), and the outlet of which is connected to the outside. The electric heater (400) is used to heat and decompose dioxins in the waste gas.

2. The dioxin removal device according to claim 1, characterized in that, It also includes a buffer tank (500), the air inlet of which is connected to the exhaust port of the water washing tower (200), and the exhaust port of the buffer tank (500) is connected to the air inlet of the adsorption tower (300). The buffer tank (500) is used to stabilize the gas pressure and regulate the gas flow rate.

3. The dioxin removal device according to claim 2, characterized in that, Multiple adsorption towers (300) are connected in parallel.

4. The dioxin removal device according to claim 3, characterized in that, It also includes a plurality of first switching valves (600), the number of which is the same as the number of adsorption towers (300). The plurality of first switching valves (600) are connected in parallel and their inlets are connected to the exhaust ports of the buffer tank (500). Each first switching valve corresponds to one adsorption tower (300) connected in series. The exhaust port of the first switching valve (600) is connected to the inlet of the adsorption tower (300).

5. The dioxin removal device according to claim 4, characterized in that, The first switching valve (600) is provided with a first safety valve (610). There are multiple first safety valves (610). One first safety valve (610) is connected in series with one first switching valve (600). The air inlet of the first safety valve (610) is connected to the exhaust port of the first switching valve (600). Multiple first safety valves (610) are connected in parallel and their exhaust ports are connected to the outside.

6. The dioxin removal device according to claim 5, characterized in that, It also includes multiple second switching valves (700), the number of which is the same as the number of adsorption towers (300). Each second switching valve (700) corresponds to one adsorption tower (300) connected in series. The air inlet of the second switching valve (700) is connected to the exhaust port of the adsorption tower (300). Multiple second switching valves (700) are connected in parallel and their exhaust ports are connected to the air inlet of the electric heater (400).

7. The dioxin removal device according to claim 6, characterized in that, It also includes a second safety valve (710), and multiple second safety valves (710) are provided. One second safety valve (710) is connected in parallel with one second switching valve (700). The air inlet of the second safety valve (710) is connected to the exhaust port of the adsorption tower (300). Multiple second safety valves (710) are connected in parallel and their exhaust ports are connected to the outside.

8. The dioxin removal device according to claim 7, characterized in that, The buffer tank (500) is connected to a third safety valve (510), one end of which is connected to the third safety valve (510), and the other end of which is connected to the outside.

9. A dioxin removal device according to claim 1, characterized in that, The water washing tower (200) includes a reflux device (210), which is located on the periphery of the water washing tower (200), and an alkaline liquid flows through the reflux device (210).

10. A dioxin removal device according to claim 9, characterized in that, The reflux device (210) is equipped with a heat exchanger (211), which is used to heat the alkaline liquid in the reflux device (210).

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