Purification treatment device suitable for chemical waste gas stink and treatment method thereof

Abstract

The invention relates to the technical field of waste gas treatment, and particularly discloses a purification treatment device suitable for chemical waste gas stink and a treatment method thereof.The purification treatment device comprises an acid pickling tower, an alkaline washing tower, a heat exchange washing tower, a demister, pulse plasma equipment and a water washing tower which are sequentially communicated; acid or alkaline malodorous components in waste gas are removed through an acid-base neutralization reaction of the acid washing tower and the alkaline washing tower, soluble malodorous gas is further removed by spraying a washing solution in the heat exchange washing tower, liquid drops in the waste gas are removed by the demister, and the liquid drops are prevented from carrying pollutants and entering pulse plasma equipment to influence the plasma treatment effect. The pulsed plasma technology intensified decomposition has efficient treatment capacity on refractory malodorous substances, the overall treatment efficiency is remarkably improved, residual pollutants in the waste gas are further removed by spraying clear water in the water scrubber, tail end purification is guaranteed, standard emission of the waste gas is guaranteed, and the malodorous treatment efficiency of the chemical waste gas is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of waste gas treatment, and in particular relates to a purification treatment device and a treatment method suitable for chemical waste gas odor. Background Art

[0002] Chemical waste gas mainly contains inorganic pollutants and organic pollutants. Among them, inorganic pollutants mainly include sulfur oxides, nitrogen oxides, carbon oxides and halides, and organic pollutants include volatile organic compounds and polycyclic aromatic hydrocarbons. Due to the complex composition of chemical waste gas, in order to prevent chemical waste gas from polluting the environment, chemical waste gas needs to be purified to reduce the impact of pollutants on the environment.

[0003] At present, chemical waste gas is usually purified by absorption, using liquid absorbents to contact the waste gas, causing pollutants to dissolve or undergo chemical reactions and be removed. For example, Chinese patent application number 202220927840.2 discloses a coal chemical waste gas treatment and environmental protection device, in which the air inlet of the pickling tower is connected to the waste gas collection pipe. The air outlet of the pickling tower is connected to the air inlet of the alkali washing tower. The air outlet of the alkali washing tower is connected to the air inlet of the biological treatment mechanism. The air outlet of the biological treatment mechanism is connected to the air inlet of the activated carbon adsorption mechanism. The air outlet of the activated carbon adsorption mechanism is connected to the air inlet of the waste gas discharge tube. The water inlet of the acid condensate circulation tank is connected to the pickling tower, the water outlet of the acid condensate circulation tank is connected to the water inlet of the acid condensate circulation pump, and the water outlet of the acid condensate circulation pump is connected to the pickling tower. The water inlet of the alkali condensate circulation tank is connected to the alkali washing tower, the water outlet of the alkali condensate circulation tank is connected to the water inlet of the alkali condensate circulation pump, and the water outlet of the alkali condensate circulation pump is connected to the alkali washing tower. This application can prevent waste gas from polluting the environment and endangering human health.

[0004] However, since acid washing and alkali washing are mainly used to neutralize acidic gases (such as hydrogen sulfide and sulfur dioxide) and alkaline gases (such as ammonia) in the waste gas, the odor components in coal chemical waste gas are complex. In addition to acid and alkali gases, it may also contain a large amount of volatile organic compounds, such as benzene, toluene and xylene. These substances cannot be effectively removed by acid-base neutralization, thereby affecting the efficiency of chemical waste gas treatment. Therefore, we need to propose a purification treatment device suitable for chemical waste gas odor and a treatment method thereof to solve the above-mentioned problems, so that it can effectively remove ammonia gas and hydrogen sulfide gas in the waste gas through acid washing and alkali washing, and then inject high-efficiency pulse discharge energy through pulse plasma equipment to further react with the odorous gas, enhance the deodorization effect, and thus improve the odor treatment efficiency of chemical waste gas. Summary of the Invention

[0005] The purpose of the present invention is to provide a purification treatment device and a treatment method suitable for chemical waste gas odor, which effectively removes ammonia gas and hydrogen sulfide gas in the waste gas through acid washing and alkali washing, and then injects high-efficiency pulse discharge energy through pulse plasma equipment to further react with the odorous gas to enhance the deodorization effect, thereby improving the efficiency of chemical waste gas odor treatment to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A purification and treatment device suitable for chemical waste gas odor, comprising an acid washing tower, an alkali washing tower, a heat exchange washing tower, a demister, a pulse plasma device and a water washing tower connected in sequence, wherein the acid washing tower, the alkali washing tower, the heat exchange washing tower and the water washing tower are each installed with a spiral air guide component for causing the gas entering the tower to tumble, the spiral air guide component located in the acid washing tower is connected to a waste gas inlet pipe for the entry of chemical waste gas, the upper end of the water washing tower is provided with an exhaust pipe for discharging treated gas, the acid washing tower, the alkali washing tower, the heat exchange washing tower and the water washing tower are each installed with a circulation mechanism for circulating and using the discharged washing liquid, and the circulation mechanism is connected to a washing liquid inlet pipe for introducing the washing liquid.

[0008] Preferably, the interiors of the acid washing tower, alkali washing tower, heat exchange washing tower and water washing tower are also equipped with spray components and packing layers. The packing layers in the acid washing tower, alkali washing tower, heat exchange washing tower and water washing tower are respectively set as polypropylene packing layers, ceramic packing layers, polytetrafluoroethylene packing layers and activated carbon packing layers, and the fillers in the packing layers are several groups of spherical adsorption balls.

[0009] Preferably, the spiral air guide assembly includes a base and an air guide cylinder fixed above the base, the outer wall of the air guide cylinder is sleeved with a hollow spiral air guide plate, and the spiral air guide plate and the interior of the air guide cylinder are connected, the upper surface of the spiral air guide plate and the outer wall of the air guide cylinder are provided with a plurality of air outlet holes, and the lower end of the air guide cylinder is connected to the first air inlet pipe of the gas outside the tower.

[0010] Preferably, a liquid collecting chamber is provided inside the base, a cyclone is installed at the connection of the air guide cylinder in the liquid collecting chamber, the first air inlet pipe is located below the cyclone, and the lower end of the liquid collecting chamber is connected to a first liquid outlet pipe with a solenoid valve.

[0011] Preferably, the side walls around the base are provided with inclined surfaces, and a plurality of liquid guide grooves are opened around the base. A plurality of support plates are fixed on the lower surface of the base located at the liquid guide groove. The plurality of support plates are equidistantly distributed around the base, and a fixing plate for fixing to the tower wall is provided at one end of the support plate.

[0012] Preferably, the lower ends of the acid washing tower, alkali washing tower, heat exchange washing tower and water washing tower are all connected to a first drain pipe, one end of the first drain pipe is connected to a filter, the liquid outlet end of the filter is connected to the end of the circulation mechanism away from the washing liquid inlet pipe, and the filter is provided with a discharge pipe for discharging the filtered solids.

[0013] Preferably, the circulation mechanism includes a liquid pump and a mixer connected to the liquid outlet of the filter, the water outlet end of the liquid pump is connected to one end of the mixer through a circulation pipe, and the other two ends of the mixer are respectively connected to the spray assembly and the washing liquid inlet pipe, and a cooler is connected between the spray assembly and the mixer of the heat exchange washing tower, and the interior of the cooler is configured as a liquid-cooled heat exchanger.

[0014] Preferably, the defogger includes a defogger box, a plurality of defogger plates are obliquely installed inside the defogger box, one end of the defogger box located at the defogger plate is connected to a second air inlet pipe, the other end of the defogger box located at the defogger plate is connected to an air pump, the air outlet end of the air pump is connected to a second air outlet pipe, a liquid collecting tank is provided at the inner bottom of the defogger box, one end of the liquid collecting tank is connected to a second liquid drain pipe equipped with an electromagnetic valve, the plurality of defogger plates are distributed in a broken line, and the materials used for the plurality of defogger plates are different.

[0015] Preferably, the pulsed plasma device includes a housing and a high-voltage power supply system installed in the housing, a circular cavity is provided inside the housing, a partition containing an air inlet is fixed inside the cavity, the partition divides the cavity into a mixing chamber and a reaction chamber, the side wall of the mixing chamber is connected to an air supply pipe for introducing external oxygen and a third air inlet pipe for introducing demisted gas, discharge electrodes are installed on the four side walls of the reaction chamber, and the discharge electrodes are electrically connected to the high-voltage power supply system;

[0016] A spiral sheet for gas conduction is installed inside the reaction chamber, and a third gas outlet pipe is connected to one end of the reaction chamber away from the partition. The side wall of the spiral sheet contacts the inner wall of the reaction chamber, and a spiral gas conduction channel is formed between the spiral sheet and the reaction chamber. The multiple discharge electrodes are evenly distributed in the spiral gas conduction channel.

[0017] Based on the above-described device for purifying and treating the odor of chemical waste gas, the present invention further provides a method for purifying and treating the odor of chemical waste gas, comprising the following steps:

[0018] S1. Chemical waste gas enters the pickling tower for pickling to remove alkaline components in the chemical waste gas;

[0019] S2. The gas after acid washing enters the alkali washing tower for alkali washing to remove the acidic components in the gas;

[0020] S3. The gas after alkali washing enters the heat exchange scrubber for heat exchange, further removing soluble gases and fine particles in the gas, and at the same time cooling the gas;

[0021] S4. The gas after heat exchange and washing enters the demister for demisting treatment to remove the water vapor carried in the exhaust gas;

[0022] S5. The demisted gas enters the pulse plasma equipment, where the ionized gas generated by the high-voltage pulse electric field decomposes the organic matter and odor components in the gas;

[0023] S6. The gas treated by the pulse plasma equipment enters the water washing tower for further water washing to remove residual pollutants in the gas, and then is discharged through the exhaust pipe.

[0024] The present invention proposes a purification device and treatment method for chemical waste gas odor, which has the following advantages over the prior art:

[0025] 1. The present invention removes acidic or alkaline malodorous components in the waste gas through acid-base neutralization reaction through the acid washing tower and the alkaline washing tower. The heat exchange washing tower further removes soluble malodorous gases by spraying washing liquid. The demister removes droplets in the waste gas to prevent the droplets from carrying pollutants into the pulse plasma equipment and affecting the plasma treatment effect. The high-energy electrons and free radicals generated by the pulse plasma equipment can decompose the organic malodorous components in the waste gas and convert them into harmless substances. The pulse plasma technology enhances the decomposition and has an efficient treatment capability for difficult-to-degrade malodorous substances, significantly improving the overall treatment efficiency. The water washing tower further removes residual pollutants in the waste gas by spraying clean water, ensuring terminal purification, ensuring that the waste gas is discharged in compliance with the standards, and improving the odor treatment efficiency of chemical waste gas.

[0026] 2. The present invention installs spiral gas guide components inside the acid washing tower, alkali washing tower, heat exchange washing tower and water washing tower, which can make the gas in the tower tumbling, increase the contact area between the gas in the tower and the packing layer, and enable the gas to fully react with the liquid in the tower, thereby improving the washing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Shows a structural schematic diagram of an embodiment of the present invention;

[0028] Figure 2 A schematic structural diagram of a pickling tower according to an embodiment of the present invention is shown;

[0029] Figure 3 A schematic structural diagram of a spiral air guide assembly according to an embodiment of the present invention is shown;

[0030] Figure 4 A bottom view structural diagram of a spiral air guide assembly according to an embodiment of the present invention is shown;

[0031] Figure 5 The embodiment according to the present invention is shown Figure 4 A in the middle is an enlarged structural diagram;

[0032] Figure 6 A schematic structural diagram of a demister according to an embodiment of the present invention is shown;

[0033] Figure 7 A schematic structural diagram of a pulsed plasma device according to an embodiment of the present invention is shown.

[0034] In the figure: 1. Pickling tower; 101. Spray assembly; 102. Packing layer; 103. Spiral air guide assembly; 1031. Base; 1032. Liquid guide groove; 1033. Support plate; 1034. First air inlet pipe; 1035. Air guide cylinder; 1036. Spiral air guide plate; 1037. Air outlet; 1038. Liquid collecting chamber; 1039. Cyclone; 104. First liquid discharge pipe; 2. Waste gas inlet pipe; 3. Filter; 31. Discharge pipe; 4. Circulation mechanism; 41. Liquid pump; 42. Circulation pipe; 43. Mixer; 5. Washing liquid inlet pipe; 6. First air outlet pipe; 7. Alkali washing tower; 8. demister; 81. demister box; 82. second air inlet pipe; 83. second air outlet pipe; 84. collecting tank; 85. second liquid discharge pipe; 86. demister plate; 87. vacuum pump; 9. pulse plasma equipment; 91. casing; 92. high-voltage power supply system; 93. mixing chamber; 94. third air inlet pipe; 95. dynamic mixer; 96. spiral blade; 97. reaction chamber; 98. discharge electrode; 99. third air outlet pipe; 910. partition; 911. air inlet; 912. air supply pipe; 10. water washing tower; 11. heat exchange washing tower; 12. cooler; 13. exhaust pipe. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] The present invention provides Figure 1-7The device shown is suitable for purifying and treating the odor of chemical waste gas, comprising a pickling tower 1, an alkali washing tower 7, a heat exchange washing tower 11, a demister 8, a pulse plasma device 9 and a water washing tower 10 connected in sequence. The interiors of the pickling tower 1, the alkali washing tower 7, the heat exchange washing tower 11 and the water washing tower 10 are all equipped with a spiral air guide component 103 for tumbling the gas entering the tower. The spiral air guide component 103 located in the pickling tower 1 is connected to a waste gas inlet pipe 2 for entering chemical waste gas. The upper end of the water washing tower 10 is provided with an exhaust pipe 13 for discharging the treated gas. The pickling tower 1, the alkali washing tower 7, the heat exchange washing tower 11 and the water washing tower 10 are all equipped with a circulation mechanism 4 for circulating and using the discharged washing liquid. The circulation mechanism 4 is connected to a washing liquid inlet pipe 5 for introducing washing liquid.

[0037] The acid washing tower 1, the alkali washing tower 7, the heat exchange washing tower 11 and the water washing tower 10 are all equipped with a spray assembly 101 and a packing layer 102. The spray assembly 101 is located above the packing layer 102, and the spiral air guide assembly 103 is located below the packing layer 102. The packing layers 102 in the acid washing tower 1, the alkali washing tower 7, the heat exchange washing tower 11 and the water washing tower 10 are respectively configured as a polypropylene packing layer 102, a ceramic packing layer 102, a polytetrafluoroethylene packing layer 102 and an activated carbon packing layer 102, and the packing in the packing layer 102 adopts several groups of spherical adsorption balls. During washing, the tumbling of the adsorption balls is utilized to increase the activity of the gas, accelerate the reaction between the gas and the adsorption balls, and thereby improve the purification efficiency.

[0038] The spray assembly 101 consists of an annular tube and multiple nozzles. The annular tube is installed above the inside of the tower body, and multiple nozzles are evenly installed on the annular tube. One end of the annular tube is connected to the circulation mechanism 4. The washing liquid is evenly sprayed in the tower through the nozzles so that the gas in the tower can fully react with the washing liquid. The washing water is preliminarily treated by the circulation mechanism 4 and then returned to the top of the tower for recycling.

[0039] The spiral air guide assembly 103 includes a base 1031 and an air guide cylinder 1035 fixed above the base 1031. The outer wall of the air guide cylinder 1035 is sleeved and fixed with a hollow spiral air guide plate 1036, and the spiral air guide plate 1036 is connected to the interior of the air guide cylinder 1035. The upper surface of the spiral air guide plate 1036 and the outer wall of the air guide cylinder 1035 are provided with a plurality of air outlet holes 1037. The lower end of the air guide cylinder 1035 is connected to the first air inlet pipe 1034 for the gas outside the tower. By introducing the gas outside the tower into the interior of the air guide cylinder 1035, the gas inside the air guide cylinder 1035 enters the spiral air guide plate 1036 again and is discharged through the air outlet holes 1037 on the spiral air guide plate 1036 and the air guide cylinder 1035, so as to change the flow direction of the gas in the tower, make the gas in the tower tumbling, increase the contact area between the gas in the tower and the packing layer 102, and enable the gas to fully react with the liquid in the tower, thereby improving the washing effect.

[0040] A liquid collecting chamber 1038 is provided within the base 1031. A cyclone 1039 is installed at the connection between the liquid collecting chamber 1038 and the air guide cylinder 1035. The first air inlet pipe 1034 is located below the cyclone 1039. The lower end of the liquid collecting chamber 1038 is connected to a first liquid outlet pipe with a solenoid valve. A rotating airflow is generated by the cyclone 1039, and the spiral air guide plate 1036 further enhances this rotating effect, allowing the gas to form a more stable spiral upward trajectory within the tower, thereby increasing the contact area between the gas and the washing liquid within the tower and improving the washing effect.

[0041] The side walls around the base 1031 are provided with inclined surfaces, and a plurality of liquid guide grooves 1032 are opened around the base 1031. A plurality of support plates 1033 are fixed to the lower surface of the base 1031 located at the liquid guide groove 1032. The plurality of support plates 1033 are equidistantly distributed around the base 1031. A fixing plate for fixing to the tower wall is provided at one end of the support plate 1033. The base 1031 is supported by the support plate 1033. The fixing plate is used to facilitate fixing the base 1031 inside the tower. At the same time, the liquid guide groove 1032 can enable the washing liquid to flow to the bottom of the tower through the gap between the liquid guide groove 1032 and the base 1031 and the inner wall of the tower.

[0042] The lower ends of the acid washing tower 1, the alkali washing tower 7, the heat exchange washing tower 11 and the water washing tower 10 are all connected to a first drain pipe 104, one end of the first drain pipe 104 is connected to a filter 3, the liquid outlet end of the filter 3 is connected to the end of the circulation mechanism 4 away from the washing liquid inlet pipe 5, and the filter 3 is provided with a discharge pipe 31 for discharging the filtered solids. An activated carbon filter layer is provided inside the filter 3, and the washing liquid discharged from the tower is filtered through the activated carbon filter layer, and the filtered liquid is circulated to the tower by the circulation mechanism 4, so that the filtrate can be recycled and the use of the filtrate is reduced. The discharge pipe 31 is used to discharge the solids filtered by the filter 3.

[0043] The circulation mechanism 4 includes a liquid pump 41 and a mixer 43 connected to the liquid outlet of the filter 3. The water outlet end of the liquid pump 41 is connected to one end of the mixer 43 through a circulation pipe 42. The other two ends of the mixer 43 are respectively connected to the spray component 101 and the washing liquid inlet pipe 5. The washing water is returned to the mixer 43 through the circulation pipe 42 by the liquid pump 41, and the washing liquid is mixed with the washing water through the mixer 43 and then transmitted to the spray component 101 for spraying, so that the washing water can be recycled.

[0044] A cooler 12 is connected between the spray assembly 101 of the heat exchange washing tower 11 and the mixer 43. The cooler 12 is configured as a liquid-cooled heat exchanger. The mixed washing liquid is cooled to 0°C to 5°C by the cooler 12 and then transmitted to the spray assembly 101 in the heat exchange washing tower 11. The cold water sprayed by the spray assembly 101 cools the gas in the heat exchange washing tower 11 for heat exchange, thereby reducing the chance of the gas after alkali washing continuing to react and produce odor.

[0045] The demister 8 includes a demister box 81, a plurality of demister plates 86 are installed obliquely inside the demister box 81, one end of the demister box 81 located on the demister plate 86 is connected to a second air inlet pipe 82, the other end of the demister box 81 located on the demister plate 86 is connected to an air pump 87, the air outlet end of the air pump 87 is connected to a second air outlet pipe 83, a liquid collecting tank 84 is provided at the inner bottom of the demister box 81, one end of the liquid collecting tank 84 is connected to a second liquid drain pipe 85 equipped with a solenoid valve, and the exchange The gas after heat washing enters the interior of the demisting box 81 through the second air inlet pipe 82, and passes through multiple demisting plates 86 in sequence. After the water vapor in the gas is removed by the demisting plates 86, the gas is transmitted to the pulse plasma equipment 9 through the second air outlet pipe 83. By setting the vacuum pump 87, the flow rate of the gas in the demisting box 81 can be accelerated, and the gas demisting efficiency can be improved. At the same time, the condensed water droplets in the demisting box 81 are collected through the liquid collecting tank 84, and the collected liquid is discharged through the second drain pipe 85.

[0046] The multiple defogger plates 86 are distributed in a broken line, and the materials used for the multiple defogger plates 86 are different. The material of the defogger plates 86 is set to one of stainless steel, polypropylene, fiberglass, titanium alloy, and nickel alloy. According to the actual chemical waste gas treatment needs, defogger plates 86 of different materials are selected and installed inside the defogger box 81, so that the defogger 8 can effectively remove water vapor in the gas.

[0047] The pulse plasma device 9 includes a housing 91 and a high-voltage power supply system 92 installed in the housing 91. A circular cavity is provided inside the housing 91. A partition 910 containing an air inlet 911 is fixed inside the cavity. The partition 910 divides the cavity into a mixing chamber 93 and a reaction chamber 97. The side wall of the mixing chamber 93 is connected to a gas supply pipe 912 for introducing external oxygen and a third gas inlet pipe 94 for introducing demisted gas. Discharge electrodes 98 are installed on the four side walls of the reaction chamber 97. The discharge electrodes 98 are electrically connected to the high-voltage power supply system 92. A spiral sheet 96 for guiding gas is installed inside the reaction chamber 97. The end of the reaction chamber 97 away from the partition 910 is connected to a third gas outlet pipe 99.

[0048] The high-voltage power supply system 92 increases the high-voltage pulse energy, and high-energy pulse voltage is generated through capacitor energy storage or high-frequency inversion technology to drive the ionization reaction. The discharge electrode 98 uses high-voltage pulses to form an ionization channel in the gas medium to generate plasma. During ionization, the high-voltage power supply system 92 applies a pulse voltage to the discharge electrode 98. The gas between the discharge electrodes 98 is broken down under the action of the strong electric field, and the electrons are accelerated and collide with the gas molecules, resulting in ionization and excitation, forming a plasma containing electrons, ions, free radicals and excited molecules. When the odorous gas enters the high-energy plasma area, the odorous gas molecules will collide with the high-energy electrons, ions and other active particles in the plasma. These high-energy particles have very high energy and can Destroy the chemical bonds of malodorous gas molecules, such as those in sulfur-containing compounds (hydrogen sulfide, sulfur dioxide, mercaptans, sulfides, etc.), nitrogen-containing compounds (ammonia, amines, amides, etc.), hydrocarbons, and aromatic hydrocarbons. After the chemical bonds of malodorous gas molecules are broken, they will undergo redox reactions with oxygen and other active substances in the plasma. In this process, the malodorous gas components are decomposed into odorless and harmless substances such as carbon dioxide and water, thereby achieving the purpose of deodorization. Under the action of pulsed plasma, the oxygen in the air will also be ionized to produce high concentrations of strong oxidizing substances such as ozone. These strong oxidizing substances can further react with malodorous gas molecules, oxidizing and decomposing them into harmless substances, thereby enhancing the deodorization effect.

[0049] The side wall of the spiral sheet 96 contacts the inner wall of the reaction chamber 97, and a spiral air guide channel is formed between the spiral sheet 96 and the reaction chamber 97. The multiple discharge electrodes 98 are evenly distributed in the spiral air guide channel, so that the gas entering the reaction chamber 97 can be transmitted in a spiral shape, extending the residence time of the gas in the reaction chamber 97, so that the gas in the spiral air guide channel can fully react and improve the purification efficiency.

[0050] A dynamic mixer 95 for mixing the gas in the mixing chamber 93 is installed in the mixing chamber 93. The dynamic mixer 95 is located between the air supply pipe 912 and the third air inlet pipe 94. The dynamic mixer 95 realizes forced mixing of the gas through an impeller or a turbine. The impeller or turbine is installed in the mixing chamber 93. The motor that drives the impeller or turbine to stir is installed on the outside of the casing 91. The motor is connected to the impeller or turbine through a coupling, so that the motor can drive the impeller or turbine to rotate to achieve mixing and stirring of the gas.

[0051] Through the synergistic effect of the acid washing tower 1, the alkaline washing tower 7, the heat exchange washing tower 11, the demister 8, the pulse plasma equipment 9 and the water washing tower 10, the malodorous components in the chemical waste gas are treated in multiple stages and efficiently decomposed. The acid-base neutralization reaction removes the acidic and alkaline malodorous gases, the pulse plasma technology enhances the decomposition of organic malodorous substances, the demister 8 and the water washing tower 10 ensure the terminal purification, and finally the waste gas is discharged in compliance with the standards.

[0052] Based on the above-described device for purifying and treating the odor of chemical waste gas, the present invention further provides a method for purifying and treating the odor of chemical waste gas, comprising the following steps:

[0053] S1, chemical waste gas enters the pickling tower 1 for pickling to remove alkaline components in the chemical waste gas, such as ammonia, and at the same time remove some particulate matter and dissolved gases. The washing liquid used in the pickling tower 1 is sulfuric acid or hydrochloric acid;

[0054] S2, the gas after acid washing enters the alkali washing tower 7 for alkali washing to remove acidic components in the gas, such as hydrogen sulfide and sulfur dioxide, to further purify the exhaust gas, wherein the washing liquid used in the alkali washing tower 7 is sodium hydroxide or sodium carbonate;

[0055] S3, the gas after alkali washing enters the heat exchange scrubber 11 for heat exchange, further removing soluble gases and fine particles in the gas, and at the same time cooling the gas to reduce the chance of the gas continuing to react and produce odor after acid and alkali treatment;

[0056] S4. The gas after heat exchange washing enters the demister 8 for demisting treatment to remove water vapor carried in the exhaust gas and prevent droplets from entering the pulse plasma equipment 9 and affecting the gas treatment effect. The washing liquid used in the heat exchange washing tower 11 is clean water or recycled water to remove soluble gases and fine particles in the exhaust gas;

[0057] S5, the demisted gas enters the pulse plasma device 9, and the ionized gas generated by the high-voltage pulse electric field decomposes the organic matter and odor components in the gas;

[0058] S6. The gas treated by the pulse plasma device 9 enters the water scrubber 10 for further water washing to remove residual pollutants in the gas, ensuring that the exhaust gas meets the emission standards, and then is discharged through the exhaust pipe 13. The washing liquid used in the water scrubber 10 is clean water or circulating water, which is used to remove soluble gases and fine particulate matter in the exhaust gas.

[0059] The acid washing tower 1 and the alkaline washing tower 7 remove acidic or alkaline malodorous components in the exhaust gas, such as hydrogen sulfide and ammonia, through acid-base neutralization reaction; the heat exchange washing tower 11 further removes soluble malodorous gases, such as low-molecular organic matter, by spraying washing liquid; the demister 8 removes droplets in the exhaust gas to prevent the droplets from carrying pollutants into the pulse plasma equipment 9 and affecting the plasma treatment effect. The high-energy electrons and free radicals generated by the pulse plasma equipment 9 can decompose the organic malodorous components in the exhaust gas, such as volatile organic compounds (VOCs), and convert them into harmless substances. The pulse plasma technology enhances the decomposition and has an efficient treatment capability for difficult-to-degrade malodorous substances, significantly improving the overall treatment efficiency. The water washing tower 10 further removes residual pollutants in the exhaust gas by spraying clean water, ensuring terminal purification and ensuring that the exhaust gas meets the emission standards.

[0060] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for purifying and treating the odor of chemical waste gas, characterized by: The invention comprises an acid washing tower (1), an alkali washing tower (7), a heat exchange washing tower (11), a demister (8), a pulse plasma device (9) and a water washing tower (10) which are connected in sequence. The acid washing tower (1), the alkali washing tower (7), the heat exchange washing tower (11) and the water washing tower (10) are all installed with a spiral air guide component (103) for causing the gas entering the tower to tumble. The spiral air guide component (103) located in the acid washing tower (1) is connected to a waste gas inlet pipe (2) for the entry of chemical waste gas. The upper end of the water washing tower (10) is provided with an exhaust pipe (13) for discharging the treated gas. The acid washing tower (1), the alkali washing tower (7), the heat exchange washing tower (11) and the water washing tower (10) are all installed with a circulation mechanism (4) for circulating and using the discharged washing liquid. The circulation mechanism (4) is connected to a washing liquid inlet pipe (5) for introducing the washing liquid.

2. A purification device for chemical waste gas odor according to claim 1, characterized in that: The acid washing tower (1), the alkali washing tower (7), the heat exchange washing tower (11) and the water washing tower (10) are further provided with a spray assembly (101) and a packing layer (102). The packing layers (102) in the acid washing tower (1), the alkali washing tower (7), the heat exchange washing tower (11) and the water washing tower (10) are respectively provided with a polypropylene packing layer (102), a ceramic packing layer (102), a polytetrafluoroethylene packing layer (102) and an activated carbon packing layer (102), and the packing in the packing layer (102) is a plurality of groups of spherical adsorption balls.

3. The device for purifying malodorous chemical waste gas according to claim 1, characterized in that: The spiral air guide assembly (103) comprises a base (1031) and an air guide cylinder (1035) fixed above the base (1031); a hollow spiral air guide plate (1036) is fixedly sleeved on the outer wall of the air guide cylinder (1035); the spiral air guide plate (1036) and the interior of the air guide cylinder (1035) are connected; a plurality of air outlet holes (1037) are provided on the upper surface of the spiral air guide plate (1036) and the outer wall of the air guide cylinder (1035); and the lower end of the air guide cylinder (1035) is connected to a first air inlet pipe (1034) for gas outside the tower.

4. The device for purifying malodorous chemical waste gas according to claim 3, characterized in that: A liquid collecting chamber (1038) is provided inside the base (1031), and a cyclone (1039) is installed at the connection between the liquid collecting chamber (1038) and the air guide cylinder (1035). The first air inlet pipe (1034) is located below the cyclone (1039), and the lower end of the liquid collecting chamber (1038) is connected to a first liquid outlet pipe with a solenoid valve.

5. The device for purifying odor from chemical waste gas according to claim 4, characterized in that: The side walls of the base (1031) are provided with inclined surfaces, and a plurality of liquid guide grooves (1032) are provided around the base (1031). A plurality of support plates (1033) are fixed on the lower surface of the base (1031) located at the liquid guide grooves (1032). The plurality of support plates (1033) are equidistantly distributed around the base (1031), and a fixing plate for fixing to the tower wall is provided at one end of the support plate (1033).

6. The device for purifying malodorous chemical waste gas according to claim 1, characterized in that: The lower ends of the acid washing tower (1), the alkali washing tower (7), the heat exchange washing tower (11) and the water washing tower (10) are all connected to a first liquid discharge pipe (104), one end of the first liquid discharge pipe (104) is connected to a filter (3), the liquid outlet end of the filter (3) is connected to an end of the circulation mechanism (4) away from the washing liquid inlet pipe (5), and the filter (3) is provided with a discharge pipe (31) for discharging filtered solids.

7. The device for purifying malodorous chemical waste gas according to claim 6, characterized in that: The circulation mechanism (4) comprises a liquid pump (41) and a mixer (43) connected to the liquid outlet of the filter (3); the water outlet end of the liquid pump (41) is connected to one end of the mixer (43) through a circulation pipe (42); the other two ends of the mixer (43) are respectively connected to the spray assembly (101) and the washing liquid inlet pipe (5); a cooler (12) is connected between the spray assembly (101) of the heat exchange washing tower (11) and the mixer (43); and the interior of the cooler (12) is configured as a liquid-cooled heat exchanger.

8. The device for purifying odor from chemical waste gas according to claim 1, characterized in that: The demister (8) comprises a demister box (81), a plurality of demister plates (86) are obliquely installed inside the demister box (81), one end of the demister box (81) located on the demister plate (86) is connected to a second air inlet pipe (82), the other end of the demister box (81) located on the demister plate (86) is connected to an air pump (87), the air outlet end of the air pump (87) is connected to a second air outlet pipe (83), a liquid collecting tank (84) is provided at the inner bottom of the demister box (81), one end of the liquid collecting tank (84) is connected to a second liquid discharge pipe (85) installed with a solenoid valve, the plurality of demister plates (86) are distributed in a broken line, and the materials used for the plurality of demister plates (86) are different.

9. The device for purifying malodorous chemical waste gas according to claim 1, characterized in that: The pulse plasma device (9) includes a housing (91) and a high-voltage power supply system (92) installed in the housing (91); a circular cavity is provided inside the housing (91); a partition (910) containing an air inlet (911) is fixed inside the cavity; the partition (910) divides the cavity into a mixing chamber (93) and a reaction chamber (97); a side wall of the mixing chamber (93) is connected to a gas supply pipe (912) for introducing external oxygen and a third gas inlet pipe (94) for introducing demisted gas; discharge electrodes (98) are installed on all four side walls of the reaction chamber (97); the discharge electrodes (98) are electrically connected to the high-voltage power supply system (92); A spiral sheet (96) for guiding gas is installed inside the reaction chamber (97); one end of the reaction chamber (97) away from the partition (910) is connected to a third gas outlet pipe (99); the side wall of the spiral sheet (96) contacts the inner wall of the reaction chamber (97); a spiral gas guide channel is formed between the spiral sheet (96) and the reaction chamber (97); and a plurality of discharge electrodes (98) are evenly distributed in the spiral gas guide channel.

10. A method for purifying malodorous chemical waste gas, based on the device for purifying malodorous chemical waste gas according to any one of claims 1 to 9, characterized in that: The steps include: S1, the chemical waste gas enters the pickling tower (1) for pickling to remove the alkaline components in the chemical waste gas; S2, the gas after acid washing enters the alkali washing tower (7) for alkali washing to remove the acidic components in the gas; S3, the gas after alkali washing enters the heat exchange washing tower (11) for heat exchange, further removing soluble gases and fine particles in the gas, and at the same time cooling the gas; S4, the gas after heat exchange and washing enters the demister (8) for demisting treatment to remove the water vapor carried in the exhaust gas; S5, the demisted gas enters the pulse plasma device (9), where the ionized gas generated by the high-voltage pulse electric field decomposes the organic matter and malodorous components in the gas; S6. The gas treated by the pulse plasma device (9) enters the water washing tower (10) for further water washing to remove the residual pollutants in the gas, and then is discharged through the exhaust pipe (13).

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