Integrated efficient waste gas purification device
By designing an integrated high-efficiency exhaust gas purification device, using preheating chamber and multi-turn exhaust nozzle technology, the problem of medium and low concentration organic waste gas treatment is solved, and efficient and economical waste gas purification effect is achieved.
Patent Information
- Application Number
- CN202420257317.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-02
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-02-02
AI Technical Summary
The prior art is difficult to efficiently treat medium and low concentration organic waste gas, especially exhaust gas with a heat value of 200-500 Kcal/Nm3, and traditional destructive methods have insufficient economic and efficiency.
Design an integrated high-efficiency exhaust gas purification device, including an auxiliary burner, an oxidation chamber, and a preheating chamber. The waste gas is preheated to above 500°C through the preheating chamber, and the waste gas is tangentially sent into the oxidation chamber by using multiple circles of exhaust nozzles to assist combustion. The device is heated to 700°C or above to achieve efficient oxidation of organic matter.
It has achieved a 99.9% waste gas purification efficiency, a wide range of application, low investment and operation costs, and the device is safe, reliable, efficient and energy-saving.
Smart Images
Figure CN222503858U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an integrated high-efficiency waste gas purification device, belongs to the technical field of organic waste gas treatment, and is particularly suitable for the treatment of medium and low concentration organic waste gas. Background Art
[0002] Volatile organic compounds and malodorous gases are usually called organic waste gas. Their sources are very wide and can be divided into three categories: 1. Industrial sources, which are produced in large factories such as petrochemical plants, refineries, pesticide plants, leather factories, and industries that use a large amount of organic solvents in the production process, such as coating, printing, resin processing, enameled wire, etc.; 2. Urban public facilities. Sewage treatment plants, garbage disposal sites, septic tanks, biogas tanks, etc.; 3. Agriculture and animal husbandry, slaughterhouses, livestock and poultry farms, etc.
[0003] VOCs, volatile organic compounds, refer to organic compounds with a saturated vapor pressure greater than 70Pa at room temperature and a boiling point below 260℃ at normal pressure, or all organic compounds with corresponding volatility whose vapor pressure is greater than or equal to 10Pa at 20℃. When the concentration of VOCs is too high, it can easily cause acute poisoning, or cause headaches, dizziness, coughing, nausea, vomiting, or intoxication; severe cases can cause liver poisoning and even coma, and some may even be life-threatening. Therefore, the purification of VOCs has always been the focus of environmental protection.
[0004] Since volatile organic compounds not only harm human health but also seriously pollute the environment, reducing the emission of volatile organic compounds has become an important issue in today's society. When volatile organic compounds reach a certain concentration in the air, they will pollute the environment, and people will begin to feel headaches, nausea, and weakness in their limbs; if they continue to stay for a long time, they will damage the liver, kidneys, brain and nervous system, and may even cause convulsions, coma, memory loss, and even many volatile organic compounds have been proven to be carcinogenic and mutagenic. And once they enter the atmosphere, they will cause the formation of photochemical smog, secondary aerosols and ozone. Although process optimization is a feasible method to reduce volatile organic compound pollution, in order to adapt to the increasingly serious global pollution problem, more effective and economical elimination technologies still need to be studied.
[0005] At present, there are two major types of end-of-pipe treatment technologies for organic waste gas. One type is non-destructive methods, which is to absorb and recover organic waste gas, including absorption method, adsorption method, condensation method, membrane separation method, etc. The second type is destructive methods, which use light, heat, catalysts and microorganisms to convert organic matter into inorganic harmless substances such as carbon dioxide and water, including direct oxidation incineration, catalytic combustion, biological treatment, photolysis and low-temperature plasma decomposition. However, with the rapid development of science, industry and transportation, and the increase in urban population, the environmental pollution caused by organic waste gas has become increasingly prominent, and new technologies are urgently needed.
[0006] In terms of environmental protection and economy, if the VOC value is high and it is possible to recycle it, it should be recycled and reused as much as possible. Therefore, non-destructive methods should be used to treat waste gas. However, in reality, the waste gas composition of organic waste gas is complex and diverse, and the concentration fluctuates greatly. It is more suitable to use destructive methods to treat it. At present, the destructive treatment methods used are mainly direct oxidation incineration, catalytic combustion, and regenerative thermal oxidizer (RTO). Direct oxidation incineration is suitable for high-concentration waste gas, and the calorific value of waste gas reaches 1000Kcal / Nm 3 Only when the combustion is self-stable, otherwise auxiliary fuel is required. Catalytic combustion is applicable to concentrations less than 10g / Nm 3 (Heat value <100Kcal / Nm 3 ), the exhaust gas calorific value reaches 500Kcal / Nm 3 The regenerative thermal oxidizer (RTO) is suitable for concentrations less than 10g / Nm 3 (Heat value <100Kcal / Nm 3 ), the exhaust gas calorific value reaches 15Kcal / Nm 3 It can only burn stably on its own, otherwise auxiliary fuel is needed.
[0007] At present, many organic waste gases generated by the chemical industry and pharmaceutical industry have calorific values of 100-800Kcal / Nm 3 , especially 200-500Kcal / Nm 3 The organic waste gas is not suitable for catalytic combustion and regenerative thermal oxidizer (RTO). Direct oxidation incineration requires more auxiliary fuel, which increases investment and operating costs and has poor economic efficiency. Utility Model Content
[0008] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a high-efficiency exhaust gas purification device with simple structure, low cost, high purification efficiency, safety and energy saving, suitable for exhaust gas with a calorific value of 100-1000Kcal / Nm 3 Organic waste gas, especially suitable for calorific value 200-500Kcal / Nm 3 Treatment of organic waste gas.
[0009] To achieve the above-mentioned purpose, the utility model discloses an integrated high-efficiency waste gas purification device, comprising an auxiliary burner, an oxidation chamber, and a preheating chamber; the oxidation chamber is in the shape of a thermos bottle, and is connected by a small straight pipe section, a conical pipe section and a large straight pipe section with a refractory layer inside, wherein the front end of the small straight pipe section is connected to the auxiliary burner for controlling the temperature in the oxidation chamber to rise to 700°C, and the rear end of the large straight pipe section is connected to the preheating chamber for preheating the organic waste gas to above 500°C, and an air distribution chamber is provided at the conical pipe section, and a multi-circle waste gas nozzle is provided on the conical pipe section for tangentially sending the high-temperature waste gas in the air distribution chamber into the oxidation chamber; an air inlet is provided above the preheating chamber, a smoke outlet is provided on the right end face, and a high-temperature waste gas channel for sending the high temperature of 700-1200°C into the connecting air distribution chamber is provided on the left end face of the preheating chamber.
[0010] The exhaust gas nozzles are evenly arranged along the tangent direction of the tapered tube section of the oxidation chamber.
[0011] The multiple circles of exhaust gas nozzles are 2-8 circles, with 6-20 nozzles in each circle.
[0012] The preheating chamber is heat exchanged by plate type heat exchange, tube type heat exchange or combined type heat exchange.
[0013] The high-temperature exhaust gas channel is an annular structure mounted on the outer periphery of the oxidation chamber, or a fan-shaped structure, a tubular structure, or a rectangular structure connected to the bottom layer of the oxidation chamber.
[0014] The air distribution chamber, high-temperature exhaust gas channel and preheating chamber are all provided with an outer insulation layer.
[0015] The auxiliary burner is an oil burner, a gas burner, or a combined burner.
[0016] Beneficial effect: Due to the adoption of the above scheme, the utility model preheats the waste gas to above 500°C through the preheating chamber, and the preheated waste gas is sent to the oxidation chamber tangentially through the waste gas nozzle. After entering the oxidation chamber, the waste gas is heated to 700°C and above by the auxiliary burner. The ignition point of 99% of the organic components of the waste gas is lower than 700°C. There is sufficient oxygen and a temperature higher than the ignition point in the oxidation chamber. Therefore, the organic matter in the waste gas begins to oxidize in the oxidation chamber. Since the waste gas enters the oxidation chamber tangentially, the waste gas rotates forward in the oxidation chamber, which effectively increases the residence time of the waste gas in the oxidation chamber and greatly improves the purification efficiency of the waste gas. The waste gas enters the oxidation chamber at the rear end of the auxiliary burner, and a separate auxiliary combustion area is formed at the front end of the oxidation chamber, which helps to improve the combustion stability of the auxiliary burner and enhances the stability of the entire waste gas purification device. The high-temperature waste gas channel surrounds the outside of the oxidation chamber, which can reduce the thickness of the refractory material of the oxidation chamber and reduce investment costs.
[0017] Compared with the existing exhaust gas technology, the technical effects of the utility model are:
[0018] 1. Exhaust gas purification efficiency is as high as 99.9%;
[0019] 2. Applicable to a wide range of exhaust gas concentrations;
[0020] 3. Low investment and operating costs;
[0021] 4. Safe, reliable, efficient and energy-saving. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a schematic diagram of the structure 1 of the integrated high-efficiency exhaust gas purification device of the present utility model.
[0023] Figure 2 It is a schematic diagram of structure 2 of the integrated high-efficiency exhaust gas purification device of the present utility model.
[0024] Figure 3 Schematic diagram of the cross section at the nozzle.
[0025] Figure 4 It is a cross-sectional schematic diagram of structure 1.
[0026] Figure 5 It is a cross-sectional schematic diagram of structure 2.
[0027] In the figure: 1- auxiliary burner; 2- oxidation chamber; 3- exhaust gas nozzle; 4- air distribution chamber; 5- high-temperature exhaust gas channel; 6- preheating chamber; 7- air inlet; 8- flue gas outlet. DETAILED DESCRIPTION
[0028] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings:
[0029] The utility model is an integrated high-efficiency waste gas purification device, comprising an auxiliary burner 1, an oxidation chamber 2, and a preheating chamber 6; the oxidation chamber 2 is in the shape of a thermos bottle, and is connected by a small straight pipe section, a tapered pipe section, and a large straight pipe section with a refractory layer inside, wherein the front end of the small straight pipe section is connected to the auxiliary burner 1 for controlling the temperature in the oxidation chamber 2 to rise to 700°C, and the auxiliary burner 1 is an oil burner, a gas burner, or a combined burner. The rear end of the large straight pipe section preheats the organic waste gas to above 500°C and is connected to the preheating chamber 6, and a gas distribution chamber 4 is installed at the tapered pipe section, and a multi-circle waste gas nozzle 3 is provided on the tapered pipe section to tangentially send the high-temperature waste gas in the gas distribution chamber 4 into the oxidation chamber 2; the waste gas nozzle 3 is evenly arranged along the tangent direction of the tapered pipe section of the oxidation chamber 2; the multi-circle waste gas nozzle 3 is 3-6 circles, and each circle has 6-8. The preheating chamber 6 is provided with an air inlet 7 above, a smoke outlet 8 on the right end face, and a high-temperature exhaust gas channel 5 for sending a high temperature of 700-1200°C to the connected air distribution chamber 4 on the left end face. The preheating chamber 6 is heat exchanged by plate heat exchange, tube heat exchange, or combined heat exchange. The high-temperature exhaust gas channel 5 is an annular structure sleeved on the periphery of the oxidation chamber 2, or a fan-shaped structure, tubular structure, or rectangular structure connected to the bottom layer of the oxidation chamber 2, which is determined according to actual needs on site. The air distribution chamber 4, the high-temperature exhaust gas channel 5, and the preheating chamber 6 are all provided with an outer insulation layer.
[0030] During operation, the auxiliary burner is first used to raise the temperature in the oxidation chamber to about 700°C, and the organic waste gas is preheated to above 500°C through the preheating chamber. After the high-temperature waste gas comes out of the preheating chamber, it enters the air distribution chamber through the high-temperature waste gas pipeline. The main function of the air distribution chamber is to evenly distribute the waste gas. The waste gas is sprayed into the oxidation chamber through the waste gas nozzle in the air distribution chamber. The waste gas nozzle is evenly arranged in the vertebral canal section of the oxidation chamber along the tangential direction. Due to the arrangement of the waste gas nozzle 3, the waste gas enters the oxidation chamber in a tangential rotation. The waste gas moves forward in a spiral in the oxidation chamber, which increases the uniformity of the temperature field of the waste gas and the residence time of the waste gas in the high-temperature oxidation area. The small straight tube section in front of the tapered tube section of the oxidation chamber forms a small combustion section. The combustion flame of the auxiliary burner is in the combustion section of the oxidation chamber, which effectively eliminates the interference of the exhaust gas entering the auxiliary burner on the combustion stability and prevents the risk of the auxiliary burner being extinguished. The operation stability of the entire equipment is improved. The high-temperature flue gas after exhaust gas oxidation is recycled through the preheating chamber. The high-temperature flue gas is used to preheat the exhaust gas, which can reduce investment costs and operating costs. The temperature range of the oxidation chamber during operation is 700-1200℃, and the temperature of the oxidation chamber is regulated by the auxiliary burner.
[0031] Embodiment 1: Figure 1 , Figure 3 and Figure 4The integrated high-efficiency exhaust gas purification device shown is mainly composed of an auxiliary burner 1, an oxidation chamber 2, an exhaust gas nozzle 3, an air distribution chamber 4, a high-temperature exhaust gas channel 5, a preheating chamber 6, an air inlet 7 and a flue gas outlet 8; the high-temperature exhaust gas channel 5 is an annular structure mounted on the periphery of the oxidation chamber 2.
[0032] Embodiment 2: Figure 2 , Figure 3 and Figure 5 The integrated high-efficiency exhaust gas purification device shown is basically the same as the first embodiment, except that the high-temperature exhaust gas channel 5 is a fan-shaped structure connected to the bottom layer of the oxidation chamber 2.
Claims
1. An integrated high-efficiency exhaust gas purification device, comprising an auxiliary burner (1), an oxidation chamber (2), and a preheating chamber (6); characterized in that: The oxidation chamber (2) is in the shape of a thermos bottle and is formed by connecting a small straight pipe section, a conical pipe section and a large straight pipe section with a refractory layer inside. The front end of the small straight pipe section is connected to an auxiliary burner (1) for controlling the temperature in the oxidation chamber (2) to rise to 700°C, and the rear end of the large straight pipe section is connected to a preheating chamber (6) for preheating organic waste gas to above 500°C. The conical pipe section is provided with an air distribution chamber (4), and the conical pipe section is provided with a plurality of exhaust gas nozzles (3) for tangentially sending the high-temperature exhaust gas in the air distribution chamber (4) into the oxidation chamber (2); an air inlet (7) is provided above the preheating chamber (6), a smoke outlet (8) is provided on the right end face, and a high-temperature exhaust gas channel (5) for sending a high temperature of 700-1200°C into the connecting air distribution chamber (4) is provided on the left end face of the preheating chamber (6).
2. The integrated high-efficiency exhaust gas purification device according to claim 1 is characterized in that: The exhaust gas nozzles (3) are evenly arranged along the tangent direction of the cone tube section of the oxidation chamber (2).
3. The integrated high-efficiency exhaust gas purification device according to claim 1 is characterized in that: The multiple circles of exhaust gas nozzles (3) are 2 to 8 circles, with 6 to 20 nozzles in each circle.
4. The integrated high-efficiency exhaust gas purification device according to claim 1 is characterized in that: The preheating chamber (6) is heat exchanged by plate type heat exchange, tube type heat exchange or combined type heat exchange.
5. The integrated high-efficiency exhaust gas purification device according to claim 1 is characterized in that: The high-temperature exhaust gas channel (5) is an annular structure mounted on the periphery of the oxidation chamber (2), or a fan-shaped structure, a tubular structure, or a rectangular structure connected to the bottom layer of the oxidation chamber (2).
6. The integrated high-efficiency exhaust gas purification device according to claim 1 is characterized in that: The air distribution chamber (4), the high-temperature exhaust gas passage (5) and the preheating chamber (6) are all provided with an external heat-insulating layer.
7. The integrated high-efficiency exhaust gas purification device according to claim 1 is characterized in that: The auxiliary burner (1) is an oil burner, a gas burner, or a combined burner.