A method and system for treating VOCs exhaust gas
By using a combination system of dish-type solar thermal reactor and Stirling generator, solar energy is used to replace auxiliary fuel for efficient treatment of VOCs waste gas, solving the problem of high auxiliary fuel demand in thermal combustion technology and achieving efficient and low-cost waste gas purification.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA NAT PETROLEUM CORP
- Filing Date
- 2023-09-12
- Publication Date
- 2026-06-09
Smart Images
Figure CN119617434B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of waste gas treatment technology, and in particular to a method and system for treating VOCs waste gas. Background Technology
[0002] VOCs (volatile organic compounds) generally share common characteristics such as low boiling points, high vapor pressures, and strong photochemical reactivity. They are easily volatile at room temperature, often have irritating odors and are toxic, and are flammable and explosive. Under ultraviolet radiation, the hydrocarbons contained in VOCs react with NO... x SO 2 A photochemical chain reaction occurs, generating secondary pollutants such as O3, peroxyacetyl nitrate (PAN), aldehydes, and organic acids, accompanied by unpleasant odors and foul smells released into the air; O3 further oxidizes SO2 in the atmosphere. 2 NO x And VOCs, generating SO 2- NO - Anions, these anions react with NH in the atmosphere + Ca 2+ Mg 2+ Cations combine to form inorganic PM2.5. Primary pollutants from direct VOC emissions and secondary pollutants from VOCs through a series of reactions can constitute photochemical smog in the air. Furthermore, VOCs under sunlight form highly reactive free radicals. These free radicals and other intermediates react with toluene, xylene, and other compounds to produce semi-volatile products. These semi-volatile products then distribute between the gas and particulate phases. Under suitable environmental conditions, semi-volatile organic compounds can enter the particulate phase, increasing particulate matter concentration. These generated particulate matter are secondary organic aerosols. Therefore, VOCs treatment is necessary.
[0003] VOCs treatment technologies can be mainly divided into two categories: recovery and removal. Recovery technology mainly uses physical methods to separate the components of VOCs-containing waste gas through specialized equipment, thereby achieving purification. Removal technology uses chemical methods to degrade VOCs into non-toxic and odorless gases, which is a destructive method.
[0004] In most cases of treating organic waste gas, the concentration of VOCs in the waste gas is generally very low, and the air volume is quite large. Therefore, combustion is often used to purify organic waste gas because it is often not economically viable to recover the organic solvents from the waste gas, or because it is difficult to reuse the recovered solvents, and secondary pollution may occur during the recovery process. Combustion is based on the characteristic that organic compounds in waste gas can be burned and oxidized. Its purpose is to convert the oxidizable components in the waste gas into harmless substances through combustion. In the case of waste gas containing pure hydrocarbons, this is converted into CO2 and H2O.
[0005] Combustion methods for purifying organic waste gas are mainly divided into three types: direct combustion, thermal combustion, and catalytic combustion. When the VOC concentration in the waste gas is very high, the waste gas can be used as fuel for combustion, hence the name direct combustion. However, in the cases of thermal combustion and catalytic combustion, the concentration of combustibles in the treated waste gas is too low. Auxiliary fuels must be used to achieve combustion, hence the name thermal combustion, also known as post-combustion or smokeless combustion. Catalytic combustion also belongs to thermal combustion, but it is distinguished separately because of its catalytic reaction characteristics. The purpose of catalytic combustion is to utilize the catalytic effect of a catalyst to lower the oxidation reaction temperature and increase the reaction rate.
[0006] Direct combustion uses organic waste gas as fuel. It is typically suitable for waste gases with very high concentrations of combustibles, generally exceeding the upper explosive limit, possessing a correspondingly high calorific value, and maintaining the required combustion temperature without the need for auxiliary fuel. The flame temperature of direct combustion is generally around 1100℃. Direct combustion produces a bright flame, hence the name "flame-and-smoke combustion." In the case of general organic waste gases containing hydrocarbons, the main products of direct combustion are CO2 and H2O. In another scenario, even if the concentration of combustibles in the waste gas is very low, it can sometimes be directly burned in an existing combustion chamber in production. For example, organic waste gas can replace the air required for a boiler combustion chamber; otherwise, thermal combustion, i.e., adding auxiliary fuel, is required. Direct combustion is not suitable for purifying large volumes of low-concentration organic waste gas. While direct combustion is simple to design and technologically mature, it suffers from the disadvantage of inefficient utilization of combustion heat. Improper treatment can also produce large amounts of harmful gases and smoke, as well as heat radiation.
[0007] Thermal combustion is used because the concentration of combustibles in organic waste gas is extremely low, making it impossible for it to ignite or sustain combustion on its own. Therefore, it requires the heat generated by the combustion of auxiliary fuel to raise the waste gas temperature, oxidizing VOCs and converting them into harmless substances. Thermal combustion equipment mainly consists of an auxiliary burner and a combustion chamber. The waste gas is introduced into the combustion chamber for oxidation and combustion only when the temperature reaches a level sufficient to ignite the organic waste gas. The purified gas is then discharged into the atmosphere through a chimney. Different burners are used depending on the air content in the waste gas, determining whether additional combustion air is needed. Sufficient residence time is required in the combustion chamber to ensure complete oxidation of VOCs. Thermal combustion is simple in structure, requires low investment, is easy to operate, and can treat almost all organic waste gases while meeting regulatory emission requirements. However, it requires auxiliary fuel, resulting in high operating costs.
[0008] Catalytic combustion uses catalysts to lower the activation energy required for the oxidation of organic matter and increase the reaction rate, thus enabling oxidation and combustion at lower temperatures. This converts organic matter into harmless substances. The temperature should generally be controlled between 300 and 350°C. Solid catalysts are typically used in catalytic combustion, thus involving heterogeneous catalytic reactions. Commonly used catalysts are primarily supported catalysts, where the active components of the catalyst are deposited on a ceramic or metal support. Catalysts used in the catalytic combustion of organic waste gas mostly use ceramic materials as supports and are made into granular, cylindrical, hollow cylindrical, or honeycomb shapes. Although catalytic combustion has a significantly lower oxidation temperature compared to non-catalytic thermal combustion, making the conversion of harmful substances more economical, it has disadvantages: it requires certain organic waste gas to be treated, meaning it cannot contain substances that poison the catalyst, inhibit the reaction, clog or cover the active sites of the catalyst; furthermore, the cost of the catalyst and the frequent need for replacement also limit its application. Catalysts are prone to clogging, sintering, poisoning, damage, and activity degradation; and there are limitations on the composition and concentration of certain pollutants.
[0009] Among the many VOCs treatment technologies, thermal combustion equipment is widely used due to its advantages such as simplicity, low investment cost, convenient operation, wide range of waste gas treatment, and low emission temperature. However, the problem of high operating costs caused by the need for auxiliary fuel still needs to be solved. Summary of the Invention
[0010] This application provides a method and system for treating VOCs waste gas to improve the current problem of requiring auxiliary fuel for thermal combustion.
[0011] In a first aspect, this application provides a method for treating VOCs waste gas, the method comprising:
[0012] VOCs waste gas is pretreated to ensure that the oxygen content in the VOCs waste gas reaches a preset amount, thus obtaining the waste gas to be treated.
[0013] The waste gas to be treated is thermally combusted using a dish-type photothermal reactor to obtain treated gas, thus completing the treatment process. The dish-type photothermal reactor includes a high-temperature reactor for containing the waste gas to be treated and a dish-type photothermal device for heating the high-temperature reactor using photothermal energy.
[0014] As an optional implementation, the temperature of the thermal combustion treatment is 700-800°C.
[0015] As an optional implementation, the residence time of the waste gas to be treated in the dish-type photothermal reactor is >2s.
[0016] As an optional implementation, the oxygen volume content in the waste gas to be treated is at least 10%.
[0017] As an optional implementation, the concentration of the controlled component in the VOCs exhaust gas is below 25% of the lower explosive limit of its most explosive component or the lower explosive limit of the mixed gas.
[0018] As an optional implementation, the concentration of VOCs gas in the VOCs waste gas is 500-50000 mg / m³. 3 .
[0019] As an optional implementation, the pretreatment of VOCs waste gas to bring the oxygen content in the VOCs waste gas to a preset level, resulting in waste gas to be treated, includes:
[0020] VOCs waste gas is mixed with oxygen-containing gas to achieve a preset oxygen content in the VOCs waste gas, thus obtaining the waste gas to be treated.
[0021] As an optional implementation, the method further includes utilizing the waste heat of the treated gas, including for use in a Stirling generator and for heating VOCs exhaust gas.
[0022] Secondly, this application provides a VOCs waste gas treatment system, the system comprising:
[0023] Exhaust gas pipelines are used to transport VOCs exhaust gas;
[0024] An oxygen-containing gas pipeline is used to transport oxygen-containing gas. The oxygen-containing gas pipeline is connected to the waste gas pipeline and is used to pretreat VOCs waste gas so that the oxygen content in the VOCs waste gas reaches a preset amount, thereby obtaining waste gas to be treated.
[0025] A dish-type photothermal reactor is used to thermally combust the waste gas to be treated to obtain treated gas. The dish-type photothermal reactor includes a high-temperature reactor for containing the waste gas to be treated and a dish-type photothermal device for heating the high-temperature reactor using photothermal energy. The high-temperature reactor is connected to the waste gas pipeline to receive the waste gas to be treated.
[0026] As an optional implementation, the system further includes: a waste heat utilization component, which includes a Stirling generator and a heat exchanger. The Stirling generator is connected to the high-temperature reactor to receive the treated gas for primary waste heat utilization. The hot side of the heat exchanger is connected to the Stirling generator to receive the treated gas after primary waste heat utilization. The cold side of the heat exchanger is connected to an exhaust gas pipeline to perform secondary waste heat utilization on the treated gas to heat the VOCs exhaust gas.
[0027] The technical solutions provided in this application have the following advantages compared with the prior art:
[0028] The method provided in this application uses renewable solar energy as an energy source to replace auxiliary fuel. It utilizes the high-temperature environment generated by a dish-type solar thermal device to heat a thermal reactor. The thermal reactor then treats VOCs waste gas using thermal combustion, reducing the need for auxiliary fuel to create the required temperature environment and addressing the current problem of thermal combustion requiring auxiliary fuel. Simultaneously, the concentration of non-methane total hydrocarbons in the treated gas does not exceed 20 mg / m³. 3 The removal efficiency is no less than 97%. Attached Figure Description
[0029] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.
[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0031] Figure 1 A flowchart illustrating the method provided in the embodiments of this application;
[0032] Figure 2 This is a schematic diagram of the system structure provided in the embodiments of this application;
[0033] Figure 3 The cycle flow and TS diagram of the Stirling generator. Detailed Implementation
[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0035] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.
[0036] Figure 1 A flowchart illustrating the method provided in the embodiments of this application, as shown below. Figure 1 As shown in the figure, this application provides a method for treating VOCs waste gas, the method comprising:
[0037] S1. Pre-treat the VOCs waste gas to ensure that the oxygen content in the VOCs waste gas reaches a preset amount, thus obtaining the waste gas to be treated;
[0038] In some embodiments, the pretreatment of VOCs waste gas to achieve a preset oxygen content and obtain waste gas to be treated includes: mixing VOCs waste gas with oxygen-containing gas to achieve a preset oxygen content and obtain waste gas to be treated. Specifically, the oxygen-containing gas can be selected from air.
[0039] In some embodiments, the concentration of the controlled component in the VOCs gas should be less than 25% of the lower explosion limit of the most explosive component or the gas mixture. The VOCs gas concentration in the VOCs exhaust gas is between 500 and 50,000 mg / m³. 3 between.
[0040] S2. The waste gas to be treated is thermally combusted using a dish-type photothermal reactor to obtain treated gas, thus completing the treatment; the dish-type photothermal reactor includes a high-temperature reactor for containing the waste gas to be treated and a dish-type photothermal device for heating the high-temperature reactor using photothermal energy.
[0041] In some embodiments, the high-temperature environment of 700–800°C generated by the dish-type photothermal focus provides the reaction heat for waste gas treatment, creating the thermal conditions for VOCs decomposition. This replaces the auxiliary fuel used in current thermal combustion technologies to provide heat, thus saving fuel.
[0042] In some embodiments, the residence time in the VOCs gas thermal reactor is >2 s to provide sufficient reaction time.
[0043] In some embodiments, when the reactor temperature is 700-800°C, an oxygen content of 10% in the flue gas is sufficient to meet the treatment requirements, thereby reducing the amount of air injected and the size of the fan equipment.
[0044] S3. The method further includes utilizing the waste heat of the treated gas, the waste heat utilization including for Stirling generator and heating VOCs exhaust gas.
[0045] The system uses a combined recovery method to recover the high-temperature solar thermal energy absorbed by the system and the heat energy generated by the combustion of waste gas. First, a Stirling generator is used to generate electricity externally, with a voltage of 380V or 690V AC, which can be directly connected to the grid to convert the thermal energy absorbed by the system into electrical energy. Second, the low-grade thermal energy is exchanged with low-temperature VOCs gas to recover energy, thereby maximizing the utilization of energy.
[0046] This method uses renewable solar energy as an energy source to replace auxiliary fuel. It utilizes the high-temperature environment generated by a dish-type solar thermal device to heat a thermal reactor. The thermal reactor then treats VOCs waste gas using thermal combustion, reducing the need for auxiliary fuel to create the necessary temperature environment and addressing the current issue of auxiliary fuel requirements in thermal combustion. Simultaneously, the concentration of non-methane total hydrocarbons in the treated gas does not exceed 20 mg / m³. 3 The removal efficiency is no less than 97%.
[0047] Figure 2 This is a schematic diagram of the system structure provided in the embodiments of this application, such as... Figure 2 As shown, based on a general inventive concept, this application also provides a VOCs waste gas treatment system, the system comprising:
[0048] Exhaust gas pipelines are used to transport VOCs exhaust gas;
[0049] An oxygen-containing gas pipeline is used to transport oxygen-containing gas. The oxygen-containing gas pipeline is connected to the waste gas pipeline and is used to pretreat VOCs waste gas so that the oxygen content in the VOCs waste gas reaches a preset amount, thereby obtaining waste gas to be treated.
[0050] A dish-type photothermal reactor is used to thermally combust the waste gas to be treated to obtain treated gas. The dish-type photothermal reactor includes a high-temperature reactor for containing the waste gas to be treated and a dish-type photothermal device for heating the high-temperature reactor using photothermal energy. The high-temperature reactor is connected to the waste gas pipeline to receive the waste gas to be treated.
[0051] The system is implemented based on the above method. The specific steps of the method can be referred to the above embodiments. Since the system adopts some or all of the technical solutions of the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.
[0052] In some embodiments, the system further includes a waste heat utilization component, which includes a Stirling generator and a heat exchanger. The Stirling generator is connected to the high-temperature reactor to receive the treated gas for primary waste heat utilization. The hot side of the heat exchanger is connected to the Stirling generator to receive the treated gas after primary waste heat utilization. The cold side of the heat exchanger is connected to an exhaust gas pipeline to perform secondary waste heat utilization on the treated gas to heat the VOCs exhaust gas.
[0053] The Stirling engine is an external combustion closed-cycle engine, mainly composed of an external heating system, a closed-cycle system (including a regenerator, expansion chamber, compression chamber, heater, and cooler), a transmission system (including piston rods, a diamond-shaped mechanism, and a crankshaft), and a control system. Compared with conventional heat engines such as internal combustion engines, gas turbines, and steam engines, the Stirling engine has many advantages.
[0054] First, the Stirling engine has a wide range of heat source applicability, utilizing various heat sources including coal, straw, natural gas, biogas, solar energy, alcohol, and industrial waste heat for its power. Second, the Stirling engine boasts high energy efficiency; its ideal cycle—the Stirling cycle—has the same heat-to-work conversion efficiency as the Carnot cycle. Third, the Stirling engine emits very little pollution. It has a continuous combustion process and can operate with sufficient excess air, resulting in relatively low emissions of harmful gases during operation. Furthermore, because the Stirling engine does not experience detonation or knocking during operation, it operates quietly, producing very little noise, earning it the nickname "silent engine." Additionally, the working fluid pressure changes relatively smoothly during operation; the torque is relatively uniform across the entire speed range, provided the bearing load allows; it has excellent overload capacity; and it lacks components prone to failure such as valves, high-pressure fuel injection systems, and piston rings, making it highly reliable and reducing maintenance costs. Generally, increasing the temperature of the high-temperature heat source and decreasing the temperature of the low-temperature cold source are common methods to improve the efficiency of the Stirling engine, achieving efficiencies of 30-40%.
[0055] Figure 3 The cycle flow and TS diagram of a Stirling generator are shown below. Figure 3 As shown, in process 1-2, the working fluid comes into contact with the low-temperature heat source, releasing heat to the source and undergoing compression; in process 2-3, the working fluid enters the regenerator and comes into contact with it, absorbing heat from the regenerator for isochoric heating; in process 3-4, the working fluid comes into contact with the high-temperature heat source, absorbing heat from the source for isothermal expansion and performing work; in process 4-1, the working fluid enters the regenerator and comes into contact with it, releasing heat to the regenerator for isochoric cooling. The working fluid of the Stirling engine continuously undergoes these four processes to complete a cycle and thus perform work.
[0056] The entire process of VOCs waste gas in the system is as follows: VOCs waste gas from each collection point enters a gas buffer tank for stabilization and then enters a heat exchanger to recover the heat from the treated gas for heating the incoming VOCs waste gas. Then, based on the oxygen content in the VOCs waste gas, it is determined whether to add oxygen-containing gas before entering the dish-type solar thermal reactor to provide sufficient oxygen for thermal combustion. If oxygen-containing gas needs to be added, air is generally mixed into the waste gas pipeline before the dish-type solar thermal reactor. The waste gas to be treated, after being mixed and having its oxygen content adjusted, enters the coil of the high-temperature reactor at the focal point of the dish-type solar thermal device. The temperature in the coil is controlled at 700-800℃, and the heat is provided by the dish-type solar thermal device using solar energy. The residence time of the waste gas to be treated in the high-temperature reactor is approximately 2 seconds, ensuring that the reactants can react completely and the waste gas in the VOCs gas is fully decomposed. After the reaction, the temperature of the treated gas will increase due to the combined effect of the concentrated heating of the dish and the heat generated by the VOCs gas reaction, entering the subsequent heat recovery process. The VOCs gas reaction process ends, and the gas meets the emission standards required by regulations. The treated gas, at approximately 900°C, exchanges heat with the circulating medium at the hot end of the Stirling generator, transferring heat to the hydrogen gas inside the Stirling engine's heat pipes. The high-temperature, high-pressure hydrogen gas then drives the Stirling engine to perform work. The flue gas, after exchanging heat with the Stirling generator's hot end, further exchanges heat with the VOCs waste gas to be treated, increasing its temperature and reducing the heat required for heating by the dish-type solar thermal device. The treated gas, now at approximately 120°C, enters the exhaust stack for venting.
[0057] This system boasts advantages such as simple equipment, low investment costs, convenient operation, wide range of waste gas treatment capabilities, and low emission temperatures. It utilizes renewable solar energy as an auxiliary energy source, leveraging the concentrating effect of a dish-type mirror system to generate high temperatures that achieve the combustion chamber effect, providing a new approach to VOCs treatment through thermal combustion.
[0058] Various embodiments of this application may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a hard limitation on the scope of this application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Furthermore, whenever a numerical range is referred to herein, it means including any referenced number (fraction or integer) within the referred range.
[0059] In this application, unless otherwise stated, directional terms such as "upper" and "lower" specifically refer to the orientation shown in the accompanying drawings. Furthermore, in the description of this application, the terms "comprising," "including," etc., mean "including but not limited to."
[0060] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any actual relationship or order between these entities or operations. In this document, "and / or" describes the association between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. A and B can be singular or plural. In this document, "at least one" means one or more, and "more than" means two or more. "At least one," "at least one of the following," or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, "at least one of a, b, or c," or "at least one of a, b, and c," can both represent: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple.
[0061] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.
Claims
1. A method for treating VOCs waste gas, characterized in that, The method includes: VOCs waste gas is pretreated to ensure that the oxygen content in the VOCs waste gas reaches a preset amount, thus obtaining the waste gas to be treated. The waste gas to be treated is thermally combusted using a dish-type photothermal reactor to obtain treated gas, thus completing the treatment process. The dish-type photothermal reactor includes a high-temperature reactor for containing the waste gas to be treated and a dish-type photothermal device for heating the high-temperature reactor using solar energy. The waste gas to be treated, after being mixed and having its oxygen content adjusted, enters the coil of the high-temperature reactor at the focal point of the dish-type photothermal device, and the heat is provided by the dish-type photothermal device using solar energy. The temperature of the thermal combustion treatment is 700~800℃, the residence time of the waste gas to be treated in the dish-type photothermal reactor is >2s, and the volume content of oxygen in the waste gas to be treated is at least 10%.
2. The method for treating VOCs waste gas according to claim 1, characterized in that, The concentration of the controlled component in the VOCs exhaust gas is below 25% of the lower explosive limit of its most explosive component or the lower explosive limit of the mixed gas.
3. The method for treating VOCs waste gas according to claim 1, characterized in that, The concentration of VOCs gas in the VOCs waste gas is 500-50000 mg / m³. 3 .
4. The method for treating VOCs waste gas according to claim 1, characterized in that, The pretreatment of VOCs waste gas to bring the oxygen content of the VOCs waste gas to a preset level, resulting in waste gas to be treated, includes: VOCs waste gas is mixed with oxygen-containing gas to achieve a preset oxygen content in the VOCs waste gas, thus obtaining the waste gas to be treated.
5. The method for treating VOCs waste gas according to claim 3, characterized in that, The method also includes utilizing the waste heat of the treated gas, including for use in a Stirling generator and for heating VOCs exhaust gas.
6. A VOCs waste gas treatment system for use in the method according to any one of claims 1-5, characterized in that, The system includes: Exhaust gas pipelines are used to transport VOCs exhaust gas; An oxygen-containing gas pipeline is used to transport oxygen-containing gas. The oxygen-containing gas pipeline is connected to the waste gas pipeline and is used to pretreat VOCs waste gas so that the oxygen content in the VOCs waste gas reaches a preset amount, thereby obtaining waste gas to be treated. A dish-type photothermal reactor is used to thermally combust the waste gas to be treated to obtain treated gas. The dish-type photothermal reactor includes a high-temperature reactor for containing the waste gas to be treated and a dish-type photothermal device for heating the high-temperature reactor using photothermal energy. The high-temperature reactor is connected to the waste gas pipeline to receive the waste gas to be treated.
7. The VOCs waste gas treatment system according to claim 6, characterized in that, The system further includes a waste heat utilization component, which includes a Stirling generator and a heat exchanger. The Stirling generator is connected to the high-temperature reactor to receive the treated gas for primary waste heat utilization. The hot side of the heat exchanger is connected to the Stirling generator to receive the treated gas after primary waste heat utilization. The cold side of the heat exchanger is connected to an exhaust gas pipeline to perform secondary waste heat utilization on the treated gas to heat the VOCs exhaust gas.