A multi-point distributed combustion system for RCO waste gas treatment and its use method

Abstract

The invention discloses a multi-point distributed combustion system for RCO waste gas treatment and a use method thereof, belonging to the technical field of waste gas treatment equipment. The system comprises a combustion furnace and a gas input pipeline distributed outside the combustion furnace. A plurality of burners are distributed inside the combustion furnace. Meanwhile, a distribution plate with through holes evenly provided on the surface is arranged between the burner and the catalyst layer, so that multi-point distributed combustion can be realized, ensuring that the catalyst is evenly heated as a whole and is not damaged by excessive heating; and extending the service life of the catalyst. The system adopts a flow direction conversion operation, and converts the organic gas in the waste gas into CO2 and H2O through catalytic combustion, so that the toxic and harmful waste gas is converted into non-toxic and harmless gas, thereby controlling the pollution.

Description

Technical Field

[0001] The present invention belongs to the technical field of waste gas treatment equipment, and in particular relates to a RCO waste gas treatment multi-point distributed combustion system and a use method thereof. Background Art

[0002] Organic waste gas is the most common air pollutant, which mainly comes from waste gas emitted by chemical, pharmaceutical, petroleum, leather, spraying and other industries, including aliphatic hydrocarbons, halogenated hydrocarbons, sulfur hydrocarbons, aromatic hydrocarbons, organic acids, etc. These organic waste gases not only cause great direct harm to environmental quality, human health, animal and plant production, but also easily form secondary organic aerosols under photooxidation reactions, leading to a series of environmental problems such as photochemical smog, acid rain, haze and climate change. The suspension and aggregation of these volatile organic waste gases in the air is also one of the reasons for the continuous increase in PM2.5 and PM10 values. Therefore, how to reduce these volatile pollutants is crucial.

[0003] At present, common organic waste gas treatment processes include: activated carbon / cotton adsorption, biological washing absorption, plasma, photocatalytic oxidation, condensation recovery, catalytic combustion, thermal incineration, etc. However, to choose a suitable and effective treatment process, it is necessary to compare the processes according to the actual situation. Under normal circumstances, the first thing to consider is the pollution factors, production concentration, and waste gas emissions in the waste gas. Secondly, the required removal efficiency should be considered. On the basis of understanding the above two aspects, consider which process to use. However, to determine which process is suitable, it is necessary to further analyze the temperature, humidity, pollution factor characteristics (melting point, boiling point, flammability and explosiveness, water solubility, whether it contains halogens, viscosity) and non-organic pollution factors (such as particulate matter) of the waste gas. At the same time, the safety, economy and stability of the treatment process should also be taken into account. Due to the disadvantages of secondary pollution and poor safety, absorption technology is currently less used in waste gas treatment. Biotechnology was applied to waste gas purification earlier, and it is currently technically mature and is one of the mainstream technologies for waste gas treatment. In recent years, plasma technology has been relatively mature and has been widely used in low-concentration waste gas treatment; photocatalytic technology and membrane separation technology have not yet been put into practical use in large-volume waste gas treatment. Due to the wide variety of waste gases, different properties, and diverse emission conditions, different waste gas treatment technologies can be used in different industries and under different process conditions. Among them:

[0004] Thermal incineration is used in some special cases, such as in the treatment of paint exhaust gas from automobiles and home appliances. Although the concentration of organic matter in such exhaust gas is not high, the heat generated by the combustion furnace can be recovered and used for heating the paint room, and the heat utilization is better. In addition, when the exhaust gas contains compounds that can cause catalyst poisoning, such as sulfur-containing and halogen organic matter, it is not suitable to use catalytic combustion method, and thermal incineration method is usually used. When the concentration of organic matter in the exhaust gas is low, the energy consumption of the combustion method is large. In order to improve the efficiency of heat utilization and reduce the operating cost of equipment, the thermal storage thermal incineration technology (RTO) has been developed in recent years and has been widely used. The thermal storage system uses a ceramic thermal storage body with high heat capacity, and uses a direct heat exchange method to store the heat in the combustion exhaust gas in the thermal storage body. The high-temperature thermal storage body directly heats the exhaust gas to be treated, and the heat exchange efficiency can reach more than 90%, while the heat exchange efficiency of the traditional indirect heat exchanger is generally 50%-70%.

[0005] Catalytic combustion uses precious metal catalysts to reduce the activation energy of organic matter in the exhaust gas, so that the organic matter can be flamelessly burned at a lower temperature (generally around 250-300°C, and the catalytic combustion temperature of organic matter with different components is different). The principle is that when the exhaust gas passes through the catalyst, it is first adsorbed to the catalyst surface, and then catalytic combustion occurs at a certain temperature to achieve the purpose of purification. At present, the commonly used catalysts in organic waste gas treatment are generally honeycomb palladium metal catalysts and platinum metal catalysts. The catalytic combustion methods include electric heating and gas heating. The combustion types include direct catalytic combustion (CO) and regenerative catalytic combustion (RCO). Catalytic combustion is generally suitable for gaseous organic matter with small air volume, high concentration and high temperature, and the exhaust gas cannot contain sulfur, lead, mercury, arsenic and halogens that can poison the catalyst. The regenerative catalytic oxidizer RCO (Regenerative Catalytic Oxidizer) is developed on the basis of RTO. RCO consists of three major parts: regenerative bed, catalytic bed and valve. There are many types of single bed (rotating bed), double bed and triple bed. The equipment adopts flow direction conversion operation, converts hydrocarbons in the exhaust gas into CO2 and H2O through catalytic combustion, and turns toxic and harmful exhaust gas into non-toxic and harmless gas, so that the pollution can be controlled. RCO is a VOCs pollution control process with advanced technology, novel structure, high purification rate and low energy consumption. The application industries include coating, petroleum, chemical, rubber, coating, shoemaking, plastic products, printing, cable and enameled wire, etc.

[0006] The use of RCO to purify organic waste gas has the following characteristics: (1) Compared with traditional waste gas combustion equipment, a heat storage layer with higher heat exchange efficiency is added, which greatly reduces the operating energy consumption. The heat recovery efficiency of the heat storage layer can generally be as high as 95%. The total concentration of VOCs in the waste gas reaches 1000mg / m 3When the temperature is high, there is no need to replenish heat energy during operation, and heat energy can be recycled when the concentration is high. (2) This method has a high oxidation temperature for organic matter, generally above 400°C, and has a high purification efficiency, which can reach more than 98% for most organic matter. (3) This method absorbs the advantages of thermal storage oxidation technology and catalytic oxidation technology, has a wider applicable concentration range, and has stronger adaptability. When input parameters such as pollutant concentration, pollutant type and composition, air flow rate and other indicators fluctuate violently in a short period of time, it can still maintain stable operation. (4) No secondary pollutants such as nitrogen oxides are produced.

[0007] In the Chinese invention patent application CN109569186A (a waste gas purification device based on RCO technology), an activated carbon bed and a desorption fan are set in the purification device. The activated carbon first enters the waste gas of the purification device, and then the waste gas adsorbed by the activated carbon is desorbed by hot air. The flow rate of the desorption process can be controlled to concentrate the organic waste gas concentration by 10-20 times, and then the organic waste gas is decomposed under the action of the catalyst, and the purification efficiency is above 97%. In the Chinese utility model patent CN207486824U (a catalytic combustion RCO waste gas treatment device), the heat storage layer of the device is designed to be a honeycomb structure, which can contact the waste gas through a wider contact surface; at the same time, the air duct is designed to be a U-shaped structure, and the diameter of the air duct is equal to the spacing between the heaters, the heater is an L-shaped structure, and the heater and the preheating device are an integrated structure, which can effectively preheat the waste gas, so that the combustion can be more complete. In the Chinese utility model patent CN208237890U (fuel oxidation heating incinerator for purifying organic waste gas using RCO process), the first burner and the furnace body are set as an integrated structure, and the top of the first burner is connected to the air pipeline through a flange, which can make the waste gas distribution more uniform and improve the preheating effect. The operation of the burner is adjusted according to the flow rate of the incoming waste gas, which can minimize the combustion energy consumption.

[0008] In summary, thermal storage catalytic oxidation is suitable for the treatment of high-concentration exhaust gas, with high efficiency and no secondary pollution, but is not suitable for the treatment of low-concentration and low-load gases. Summary of the invention

[0009] The technical problems to be solved by the present invention are that the catalyst in the RCO exhaust gas treatment system in the prior art is easily damaged by excessive heat, the type of exhaust gas that can be treated is single, and normal treatment cannot be performed when the gas concentration and load are low.

[0010] In order to solve the above technical problems, the present invention discloses a multi-point distributed combustion system for RCO waste gas treatment, comprising a combustion furnace and a gas pipeline, wherein the combustion furnace is a closed arrangement, and the gas pipeline is distributed outside the combustion furnace and is sealed and connected to the combustion furnace.

[0011] In the combustion furnace, a heat storage layer, a catalyst layer and a burner are arranged in sequence from the bottom to the top of the furnace; a heat storage layer support plate is arranged below the heat storage layer, the heat storage layer support plate is clamped on the inner wall of the furnace body of the combustion furnace, and the heat storage layer material is laid flat on the heat storage layer support plate; a catalyst layer support plate is arranged below the catalyst layer, the catalyst layer support plate is clamped on the inner wall of the furnace body of the combustion furnace, and the catalyst layer material is laid flat on the catalyst layer support plate; the burner is connected to the top of the combustion furnace, the number of the burners is ≧2, and the number of the burners can be adjusted according to the actual working conditions.

[0012] The gas pipeline includes an exhaust gas input pipeline, a purified gas output pipeline, an air input pipeline, and an auxiliary fuel input pipeline; valves are provided on the gas pipeline;

[0013] A waste gas input port and a purified gas output port are respectively provided at the bottom of the combustion furnace, the waste gas input port is connected to the waste gas input pipe, a fan is connected to the waste gas input pipe, and the purified gas output port is connected to the purified gas output pipe; a mixed gas input port is provided at the top of the combustion furnace, the mixed gas input port is connected to the auxiliary fuel input pipe, and the air input pipe is connected to the auxiliary fuel input pipe.

[0014] Furthermore, a distribution plate is provided between the catalyst layer and the burner; through holes are evenly opened on the distribution plate; and the distribution plate is clamped on the inner wall of the furnace body of the combustion furnace.

[0015] Furthermore, the distribution plate is a stainless steel plate.

[0016] Furthermore, the through hole is in a circular, triangular or square shape.

[0017] Furthermore, the through hole is circular.

[0018] Furthermore, the diameter of the through hole is 0.8-1.2 cm.

[0019] Furthermore, the vertical cross-section of the combustion furnace is an inverted "concave" shaped structure, and the two legs at the bottom of the inverted "concave" shaped structure of the combustion furnace are provided with a heat storage layer and a catalyst layer in sequence from bottom to top; the connected part at the top of the inverted "concave" shaped structure of the combustion furnace is provided with a distribution plate and a burner in sequence from bottom to top.

[0020] Furthermore, a waste gas inlet and a purified gas outlet are respectively provided at the bottom of the two legs at the bottom of the inverted "concave" shaped structure of the combustion furnace, and are respectively connected to the waste gas inlet pipe and the purified gas outlet pipe; valves are respectively provided on the waste gas inlet and the purified gas outlet at the bottom of the two legs at the bottom of the inverted "concave" shaped structure of the combustion furnace.

[0021] Furthermore, two groups of burners are respectively arranged at the top inner side of the furnace body of the combustion furnace, directly above the two legs at the bottom of the inverted "concave" shaped structure of the combustion furnace, wherein the number of burners in each group of burners is ≧2.

[0022] The present invention also claims a method for using a multi-point distributed combustion system for RCO waste gas treatment, comprising the following steps:

[0023] (1) Open the valves of the air input pipeline and the auxiliary fuel input pipeline to allow air and auxiliary fuel to enter the combustion furnace;

[0024] (2) Turn on the burner and the auxiliary fuel begins to burn;

[0025] (3) Open the valves of the exhaust gas input pipeline and the purified gas output pipeline, and at the same time, turn on the fan of the exhaust gas input pipeline, so that the exhaust gas enters the combustion furnace;

[0026] (4) Under the action of the fan, the exhaust gas flows from the bottom of the furnace through the heat storage layer and the catalyst layer to the top of the furnace, and begins to burn in the catalyst layer;

[0027] In this system, the heat storage layer material and the catalyst layer material in the combustion furnace are distributed in a honeycomb shape above their respective support plates. The exhaust gas input from the bottom of the furnace can pass through the heat storage layer material and the catalyst layer material to flow to the top of the furnace, thereby realizing combustion treatment; the products after the exhaust gas combustion can also pass through the pore structure of the heat storage layer material and the catalyst layer material and be discharged from the purified gas output pipe.

[0028] The system can operate continuously. Since multiple burners are set up and distribution plates are arranged under the burners, multi-point distributed combustion of exhaust gas is achieved. The catalyst surface can be heated evenly, ensuring the service life of the catalyst.

[0029] This system can process combustible organic waste gas, such as VOCs. The system adopts multi-point distributed combustion to ensure that the catalyst is heated evenly as a whole and that the catalyst is not damaged by excessive heat. The system is equipped with a uniform distribution plate to improve the overall uniform heating of the catalyst plate and extend the service life of the catalyst. The system adopts flow direction change operation (the single flow direction of air intake is changed by the multi-point distributed combustion system of this system to avoid continuous ignition at a fixed point and other operations that cause overheating and combustion of the catalyst). Through catalytic combustion, the organic gas in the exhaust gas is converted into CO2 and H2O, and the toxic and harmful exhaust gas is converted into non-toxic and harmless gas, thereby controlling the pollution.

[0030] At the same time, when the concentration and load of the organic waste gas entering the combustion furnace are low, the combustion reaction is difficult to occur. In this system, an auxiliary fuel input pipeline is connected to the top of the combustion furnace, and flammable gases, such as CH4, can be introduced into the combustion furnace. The amount of flammable gas entering can be adjusted by adjusting the valve, so that the combustion of the organic waste gas is promoted under the combustion of the auxiliary fuel, thereby achieving the purpose of combustion treatment of organic waste gas with lower concentration and load.

[0031] Due to the adoption of the above technical solution, the present invention has the following advantages compared with the prior art:

[0032] 1. The system structure of the present invention is optimized, safe and reliable, can maintain safe and stable operation for a long time, and is very simple to operate and maintain.

[0033] 2. The system of the present invention realizes safe and reliable catalytic combustion degradation of organic waste gas. The catalyst is evenly heated. After the waste gas enters the system, it is stably and evenly heated and fully degraded. Therefore, the system of the present invention is suitable for the treatment of waste gas of different types, lower concentrations and loads, and is economical and efficient.

[0034] 3. The system of the present invention converts the organic gas in the exhaust gas into CO2 and H2O through catalytic combustion, turning the toxic and harmful exhaust gas into non-toxic and harmless gas, thereby controlling the pollution and achieving safety and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 : Schematic diagram of the structure of the multi-point distributed combustion system for RCO waste gas treatment.

[0036] Figure 2 : Schematic diagram of the structure of the distribution plate.

[0037] Explanation of the accompanying drawings: 1-exhaust gas input pipe; 2-purified gas output pipe; 3-heat storage body layer A; 4-heat storage body layer B; 5-catalyst layer A; 6-catalyst layer B; 7-burner A; 8-burner B; 9-burner C; 10-burner D; 11-burner E; 12-burner F; 13-air input pipe; 14-auxiliary fuel input pipe; 15-distribution plate. DETAILED DESCRIPTION

[0038] The technical solution of the present invention is described in detail below through specific embodiments.

[0039] The directional terms such as "up", "down", "left", "right", "front" and "back" mentioned in this section are only used to describe the relative position relationship of the various components of the product in this specific implementation method and are not to be understood as terms used to limit the present invention.

[0040] A multi-point distributed combustion system for RCO waste gas treatment, the structural schematic diagram of which is shown in Figure 1 shown.

[0041] The system includes a combustion furnace and a gas pipeline, wherein the gas pipeline includes an exhaust gas input pipeline 1, a purified gas output pipeline 2, an air input pipeline 13, and an auxiliary fuel input pipeline 14; valves are provided on the gas pipelines;

[0042] The cross-section of the combustion furnace is rectangular, and the combustion furnace is a closed setting. The gas pipeline is distributed outside the combustion furnace and is sealed and connected to the combustion furnace. The vertical section of the combustion furnace is an inverted "concave" shape structure. In the left leg of the two legs at the bottom of the inverted "concave" shape structure of the combustion furnace, a heat storage body layer 3 and a catalyst layer 5 are arranged in sequence from bottom to top; in the right leg, a heat storage body layer 4 and a catalyst layer 6 are arranged in sequence from bottom to top; a heat storage body layer support plate is arranged below the heat storage body layers 3 and 4, and the heat storage body layer support plate is clamped on the inner wall of the furnace body of the combustion furnace, and the heat storage body layer material is laid flat on the heat storage body layer support plate; a catalyst layer support plate is arranged below the catalyst layers 5 and 6, and the catalyst layer support plate is clamped on the inner wall of the furnace body of the combustion furnace, and the catalyst layer material is laid flat on the catalyst layer support plate; the burner is connected to the top of the combustion furnace, and the connecting part of the top of the inverted "concave" shape structure of the combustion furnace is provided with a distribution plate 15 and a burner in sequence from bottom to top. The heat storage body layers 3 and 4 are made of ceramic heat storage body materials.

[0043] At the top of the combustion furnace, directly above the two legs at the bottom of the inverted "concave" shaped structure of the combustion furnace, there are two groups of burners, each of which has three burners: the burners on the left are burner A7, burner B8, and burner C9, and the burners on the right are burner D10, burner E11, and burner F12.

[0044] A waste gas inlet and a purified gas outlet are respectively provided at the bottom of the two legs at the bottom of the inverted "concave" shaped structure of the combustion furnace, and are respectively connected to the waste gas inlet pipeline 1 and the purified gas outlet pipeline 2; valves are respectively provided on the waste gas inlet and the purified gas outlet at the bottom of the two legs at the bottom of the inverted "concave" shaped structure of the combustion furnace.

[0045] The exhaust gas input pipe 1 is connected to a fan; in order to facilitate the discharge of purified gas, a fan may also be connected to the purified gas output pipe 2.

[0046] A mixed gas inlet is provided on the top of the combustion furnace, and the mixed gas inlet is connected to an auxiliary fuel inlet pipeline 14 , and an air inlet pipeline 13 is connected to the auxiliary fuel inlet pipeline 14 .

[0047] A distribution plate 15 is provided between the catalyst layer 5, the catalyst layer 6 and the burner. Through holes are evenly provided on the distribution plate 15. The structural schematic diagram of the distribution plate 15 is shown in FIG. Figure 2As shown, the distribution plate 15 is clamped on the inner wall of the combustion furnace. The distribution plate 15 is a stainless steel plate, and the through hole is circular, and the diameter of the through hole is d=1 cm. The distribution plate 15 is a rectangular plate structure, and the cross section of the distribution plate 15 is the same as the cross section of the combustion furnace, but the size of the distribution plate 15 is smaller than the cross section of the combustion furnace, so that the distribution plate 15 can be clamped on the inner wall of the combustion furnace.

[0048] The method of using the RCO exhaust gas treatment multi-point distributed combustion system is as follows:

[0049] (1) Open the valves of the air input pipeline and the auxiliary fuel input pipeline to allow air and auxiliary fuel to enter the combustion furnace;

[0050] (2) Turn on the burner and the auxiliary fuel begins to burn;

[0051] (3) Open the valves on the exhaust gas inlet and the purified gas outlet on the bottom of any one of the legs at the bottom of the inverted “concave” shaped structure of the combustion furnace, and at the same time, turn on the fan of the exhaust gas inlet pipeline, so that the exhaust gas enters the combustion furnace from the bottom of the leg;

[0052] (4) Under the action of the fan, the exhaust gas flows from the bottom of the furnace through the heat storage layer and the catalyst layer to the top of the furnace, and begins to burn in the catalyst layer;

[0053] (5) The purified gas generated after the combustion of the waste gas is discharged from the purified gas output pipe at the bottom of the furnace;

[0054] (6) After running for 8-10 hours, the system automatically switches to the exhaust gas combustion treatment at the bottom of the other leg of the inverted "concave" shaped structure of the combustion furnace. The specific operation is: the system automatically closes the valves on the exhaust gas inlet and the purified gas outlet at the bottom of the leg on this side, and opens the valve on the other side. The exhaust gas enters the combustion furnace from the bottom of the leg on the other side, and repeats the above steps (4) and (5) to carry out exhaust gas combustion treatment.

[0055] In the above step (6), the exhaust gas is alternately circulated in the left and right legs for combustion treatment because the low-temperature gas entering the combustion furnace from the bottom of the combustion furnace will continuously absorb the heat of the heat storage layer, thereby achieving the purpose of preheating the exhaust gas. At the same time, the temperature of the heat storage layer will continue to decrease. In this way, after working for a period of time, the preheating effect of the heat storage layer on the exhaust gas will be reduced, thereby affecting the effect of the exhaust gas treatment. The alternating cycle operation can enable the heat storage layer in the side leg that is not undergoing combustion treatment to absorb more heat released during the combustion of the exhaust gas, preparing for the next working cycle, thereby improving the effect and efficiency of the exhaust gas treatment. The time for automatic switching is set in advance by the system.

[0056] When using this system to treat toluene, the toluene concentration in the exhaust gas measured at the system inlet is 100ppm and the flow rate is 3000m 3 / h; after the exhaust gas is treated with RCO, the toluene concentration in the purified gas is 0.01ppm, and the RCO purification efficiency is 99.99%.

[0057] At the same time, after the system had been running continuously for many days, it was observed that the catalyst in the catalyst layer had not changed color or deformed due to high temperature.

[0058] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto without departing from the scope of the present invention. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims. Any equivalent changes or modifications made according to the spirit and substance of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A multi-point distributed combustion system for RCO waste gas treatment, comprising a combustion furnace and a gas pipeline, wherein the combustion furnace is a closed arrangement, the gas pipeline is distributed outside the combustion furnace and is sealed and connected to the combustion furnace, characterized in that: In the combustion furnace, a heat storage layer, a catalyst layer, and a burner are sequentially arranged from the furnace bottom to the furnace top; a heat storage layer support plate is arranged below the heat storage layer, the heat storage layer support plate is clamped on the inner wall of the furnace body of the combustion furnace, and the heat storage layer material is laid flat on the heat storage layer support plate; a catalyst layer support plate is arranged below the catalyst layer, the catalyst layer support plate is clamped on the inner wall of the furnace body of the combustion furnace, and the catalyst layer material is laid flat on the catalyst layer support plate; the burner is connected to the furnace top of the combustion furnace, and the number of the burners is ≧2; The gas pipeline includes an exhaust gas input pipeline, a purified gas output pipeline, an air input pipeline, and an auxiliary fuel input pipeline; valves are provided on the gas pipeline; The bottom of the combustion furnace is respectively provided with an exhaust gas input port and a purified gas output port, the exhaust gas input port is connected to the exhaust gas input pipeline, the exhaust gas input pipeline is connected to a fan, and the purified gas output port is connected to the purified gas output pipeline; the top of the combustion furnace is provided with a mixed gas input port, the mixed gas input port is connected to the auxiliary fuel input pipeline, and the auxiliary fuel input pipeline is connected to the air input pipeline; A distribution plate is provided between the catalyst layer and the burner; through holes are evenly opened on the distribution plate; the cross section of the distribution plate is the same as the cross section of the combustion furnace, but the size of the distribution plate is smaller than the cross section of the combustion furnace; the distribution plate is clamped on the inner wall of the furnace body of the combustion furnace; The vertical cross-section of the combustion furnace is an inverted "concave" shaped structure, and the two legs at the bottom of the inverted "concave" shaped structure of the combustion furnace are provided with a heat storage layer and a catalyst layer in sequence from bottom to top; the connected part at the top of the inverted "concave" shaped structure of the combustion furnace is provided with a distribution plate and a burner in sequence from bottom to top.

2. The RCO waste gas treatment multi-point distributed combustion system according to claim 1, characterized in that: The distribution plate is a stainless steel plate.

3. The RCO waste gas treatment multi-point distributed combustion system according to claim 2, characterized in that: The through hole is in a circular, triangular or square shape.

4. The RCO waste gas treatment multi-point distributed combustion system according to claim 3, characterized in that: The through hole is circular.

5. The RCO waste gas treatment multi-point distributed combustion system according to claim 4, characterized in that: The diameter of the through hole is 0.8-1.2 cm.

6. The RCO waste gas treatment multi-point distributed combustion system according to claim 5, characterized in that: A waste gas input port and a purified gas output port are respectively provided at the bottom of the two legs at the bottom of the inverted "concave" shaped structure of the combustion furnace, and are respectively connected to the waste gas input pipeline and the purified gas output pipeline; valves are respectively provided on the waste gas input port and the purified gas output port at the bottom of the two legs at the bottom of the inverted "concave" shaped structure of the combustion furnace.

7. The RCO waste gas treatment multi-point distributed combustion system according to claim 6, characterized in that: Two groups of burners are respectively arranged at the top of the inner side of the furnace body of the combustion furnace, just above the two legs at the bottom of the inverted "concave" shaped structure of the combustion furnace, wherein the number of burners in each group of burners is ≧2.

8. A method for using the RCO waste gas treatment multi-point distributed combustion system according to any one of claims 1 to 7, characterized in that: The steps include: (1) Open the valves of the air input pipeline and the auxiliary fuel input pipeline, and air and auxiliary fuel enter the combustion furnace; (2) Turn on the burner and the auxiliary fuel begins to burn; (3) Open the valves of the exhaust gas input pipeline and the purified gas output pipeline, and at the same time, turn on the fan of the exhaust gas input pipeline, so that the exhaust gas enters the combustion furnace; (4) Under the action of the fan, the exhaust gas flows from the bottom of the furnace through the heat storage layer and the catalyst layer to the top of the furnace, and begins to burn in the catalyst layer; (5) The purified gas generated after the combustion of the exhaust gas is discharged from the purified gas output pipe at the bottom of the furnace.

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