An organic waste gas treatment system

Abstract

The present invention discloses an organic waste gas treatment system, wherein the waste gas collection device is used to collect high-concentration waste gas generated when cloth is dried inside a coating machine, and transport the high-concentration waste gas to a three-chamber RTO device; the three-chamber RTO device is used to burn the high-concentration waste gas to obtain clean gas; the fresh air collection device is used to collect low-concentration waste gas from the head and tail of the coating machine; the heat exchange device includes a low-temperature heat exchanger and a high-temperature heat exchanger, and the low-concentration waste gas is first subjected to a heat exchange conversion with the clean gas through the low-temperature heat exchanger, and the low-concentration waste gas is initially heated, and the clean gas is then discharged; thereafter, the initially heated low-concentration waste gas is subjected to a secondary heat exchange conversion through the high-temperature heat exchanger and the heat source in the regenerative combustion component on the three-chamber RTO device, and then refluxes to the inside of the coating machine to serve as a heat source. The organic waste gas treatment system of the present invention has short treatment time and high treatment rate.

Description

Technical Field

[0001] The present invention relates to the field of organic waste gas treatment, and in particular to an organic waste gas treatment system. Background Art

[0002] With increasing environmental pressure in China, environmental authorities are increasing their monitoring of organic waste gases. The coating industry, a major domestic industry, produces organic waste gases such as ethyl acetate and toluene during production due to process factors. Therefore, pollution issues in the coating industry have become a key concern for environmental protection.

[0003] To protect the environment and achieve energy conservation and consumption reduction, the coating industry currently uses an activated carbon adsorption recovery process for treating organic waste gas. In this process, an adsorption bed with a large amount of honeycomb activated carbon is used to adsorb organic solvents in organic waste gas onto the surface of the activated carbon. The clean gas obtained after treatment is discharged into the air through a fan and chimney. After a period of adsorption, the activated carbon reaches saturation, and the desorption catalytic combustion process in the process is started. The organic solvent that has been adsorbed on the surface of the activated carbon is desorbed by the desorption hot air flow. The organic solvent is converted into harmless substances such as CO2 and water vapor through a catalytic combustion reaction, and heat is released. The heat generated by the reaction is returned to the desorption hot air flow through the heat exchange part. When the desorption reaches a certain level, the heat released and the desorption heat are balanced, and the activated carbon adsorption recovery process can complete the desorption regeneration process without external heating.

[0004] However, the activated carbon adsorption recovery process has the following disadvantages: 1. Disadvantages of activated carbon treatment: a. As the adsorbent is consumed, its adsorption capacity will also weaken. After a period of use, the adsorption capacity may be small or the adsorption function may be lost. b. The adsorbent replacement cycle is short. After the adsorption is saturated, the adsorbent needs to be replaced and refilled. After replacement, it becomes hazardous waste and needs to be entrusted to a third party for disposal at a cost. 2. Disadvantages of desorption catalytic combustion treatment: a. The operating conditions cannot be too complicated, and the components need to be simple and controllable. Otherwise, the catalyst in the desorption catalytic combustion process will be poisoned and lose its activity, and the exhaust gas cannot be effectively treated. b. The replacement cycle is short. Therefore, the traditional activated carbon adsorption recovery process has been difficult to meet the processing needs of enterprises, and regenerative oxidation furnaces are now mostly used.

[0005] However, the regenerative thermal oxidation furnace usually collects the exhaust gas inside the coater, the exhaust gas at the head and the tail of the coater and then burns it. There will be problems of large exhaust gas volume and low concentration, which will cause the exhaust gas treatment time to be too long and the treatment rate to be low. Summary of the Invention

[0006] To overcome the above shortcomings, the present invention aims to provide an organic waste gas treatment system with a short treatment time and high treatment rate. This system can burn high-concentration waste gas to produce clean gas, while also absorbing the residual heat from the clean gas before discharging it. This system achieves the effect of reducing airflow and increasing concentration. Low-concentration waste gas undergoes two heat exchanges to reach the temperature inside the coating machine, and then flows back into the coating machine as a heat source, maximizing heat recovery from the low-concentration waste gas and further improving heat recovery and utilization.

[0007] In order to achieve the above objectives, the technical solution adopted by the present invention is: an organic waste gas treatment system, including a waste gas collection device, a three-chamber RTO device, a fresh air collection device and a heat exchange device,

[0008] The exhaust gas collection device is used to collect the high-concentration exhaust gas generated when the cloth is dried inside the coating machine, and transport the high-concentration exhaust gas to the three-chamber RTO device; the three-chamber RTO device is used to burn the high-concentration exhaust gas to obtain clean air;

[0009] The fresh air collection device is used to collect low-concentration exhaust gas from the head and tail of the coating machine; the heat exchange device includes a low-temperature heat exchanger and a high-temperature heat exchanger. The low-concentration exhaust gas first undergoes a heat exchange conversion with the clean air through the low-temperature heat exchanger, and the low-concentration exhaust gas is initially heated, and the clean air is then discharged; then the initially heated low-concentration exhaust gas passes through the high-temperature heat exchanger and the heat in the three-chamber RTO device for a second heat exchange conversion, and finally flows back to the inside of the coating machine as a heat source.

[0010] The beneficial effect of an organic waste gas treatment system of the present invention is that, during the process of the coater drying the cloth, the exhaust gas concentration inside the coater is higher than the exhaust gas concentration at the head and tail of the coater; therefore, the high-concentration exhaust gas referred to in this embodiment means that the exhaust gas inside the coater is of higher concentration than the exhaust gas at the head and tail of the coater, so the exhaust gas inside the coater is high-concentration exhaust gas, and the exhaust gas at the head and tail of the coater is low-concentration exhaust gas.

[0011] The collection device collects the high-concentration exhaust gas inside the coating machine and transports it to the three-chamber RTO device, which burns the high-concentration exhaust gas to obtain clean air; at this time, the clean air is at a low temperature. Among them, only a small part of the high-concentration exhaust gas inside the coating machine is extracted each time to keep the coating machine at a slightly negative pressure (the air volume of each coating machine is 10000m 3 / h).

[0012] The low-concentration exhaust gas emitted from the head and tail of the coating machine is collected by the fresh air collection device, which limits the possibility of low-concentration exhaust gas being directly emitted into the air and polluting the environment.

[0013] The low-temperature heat exchanger works first, and after a heat exchange conversion between low-concentration exhaust gas and low-temperature clean gas, the low-concentration exhaust gas is initially heated up. The temperature of the initially heated low-concentration exhaust gas is 100°C, and the heat of the low-temperature clean gas is fully utilized before being discharged, avoiding waste of resources.

[0014] The high-temperature heat exchanger acts again to convert the initially heated low-concentration exhaust gas and the heat in the three-chamber RTO device (that is, the high-temperature clean gas in the three-chamber RTO device) into a secondary heat exchange. The temperature of the low-concentration exhaust gas reaches the temperature inside the coater, which is 800°C. The high-temperature clean gas generated by the combustion of the three-chamber RTO device is further utilized. Finally, the low-concentration exhaust gas at 800°C flows back to the inside of the coater as a heat source, ensuring that the exhaust gas concentration inside the coater is maintained at 6000-10000mg / m 3 between.

[0015] This type of organic waste gas treatment system has a short treatment time and high treatment rate. Firstly, it can achieve combustion treatment of high-concentration waste gas to obtain low-temperature clean gas, and at the same time absorb the waste heat of the low-temperature clean gas before discharging it, so as to maximize the use of the heat of the clean gas and improve the heat recovery rate;

[0016] Secondly, it has the effect of reducing airflow and increasing concentration. High-concentration exhaust gas and low-concentration exhaust gas are treated separately. The low-concentration exhaust gas is subjected to two heat exchanges to reach the temperature inside the coating machine, and then flows back into the coating machine as a heat source, thereby recovering the heat in the low-concentration exhaust gas to the maximum extent and further improving the heat recovery rate. It also avoids high-concentration exhaust gas and low-concentration exhaust gas from being directly emitted into the air and polluting the environment.

[0017] As a further improvement of the present invention, the fresh air collection device includes a fresh air collection hood, a fresh air collection duct, and a fresh air blower. The fresh air blower pressurizes and draws air, forming an airflow circulation loop between the fresh air collection hood, the fresh air collection duct, the low-temperature heat exchanger, the high-temperature heat exchanger, and the interior of the coating machine. The high-temperature heat exchanger is used to obtain heat from the combustion oxidation chamber on the regenerative combustion assembly on the three-chamber RTO device, and a waste heat pipe is also connected between the high-temperature heat exchanger and the low-temperature heat exchanger. The fresh air collection hood is used to collect low-concentration exhaust gas from the head and tail of the coating machine. The fresh air collection hood, the fresh air blower, the low-temperature heat exchanger, the high-temperature heat exchanger, and the interior of the coating machine are connected by the fresh air collection duct. When the fresh air blower is in operation, the low-concentration exhaust gas passes through the fresh air collection hood, undergoes heat exchange twice in the low-temperature heat exchanger and the high-temperature heat exchanger, and then flows back to the interior of the coating machine as a heat source.

[0018] Specifically, the high-temperature heat exchanger extracts high-temperature clean air from the combustion and oxidation chamber. First, the high-temperature heat exchanger operates to initially heat the low-concentration exhaust gas, which has initially heated up, and then undergoes secondary heat exchange conversion with the majority of the high-temperature clean air. The low-concentration exhaust gas reaches the temperature inside the coating machine, reaching 800°C. At this point, the high-temperature heat exchanger extracts the remaining high-temperature clean air from the combustion and oxidation chamber. The remaining high-temperature clean air enters the low-temperature heat exchanger through the waste heat pipe. The remaining high-temperature clean air, combined with the low-temperature clean air, undergoes a primary heat exchange conversion with the low-concentration exhaust gas. The remaining heat from the high-temperature and low-temperature clean air is fully utilized before being discharged, further accelerating the temperature increase of the low-concentration exhaust gas.

[0019] As a further improvement to the present invention, the system further includes at least one hot air furnace positioned between the high-temperature heat exchanger and the interior of the coating machine. The hot air furnace is connected between the high-temperature heat exchanger and the coating machine via a fresh air collection duct. The hot air furnace further heats and raises the temperature of the low-concentration exhaust gas after the two heat exchanges. The provision of the hot air furnace further ensures that the temperature of the low-concentration exhaust gas after the two heat exchanges reaches the temperature inside the coating machine.

[0020] As a further improvement of the present invention, the exhaust gas collection device includes an exhaust gas collection pipe; the three-chamber RTO device includes a main drive fan, a regenerative combustion assembly, and an exhaust pipe that are connected. The main drive fan pressurizes and bleeds air to form an airflow path between the interior of the coating machine, the exhaust gas collection pipe, the regenerative combustion assembly, the low-temperature heat exchanger, and the exhaust pipe; the regenerative combustion assembly is used to burn high-concentration exhaust gas to obtain clean gas. The interior of the coating machine, the main drive fan, the regenerative combustion assembly, the low-temperature heat exchanger, and the exhaust pipe are connected via the exhaust gas collection pipe. When the main drive fan is activated, the high-concentration exhaust gas enters the regenerative combustion assembly through the exhaust gas collection pipe for treatment to become low-temperature clean gas. The low-temperature clean gas is finally discharged into the atmosphere through the exhaust pipe after the waste heat is absorbed by the low-temperature heat exchanger.

[0021] As a further improvement of the present invention, the heat storage combustion assembly includes a frame, a filter chamber arranged on the frame, a combustion oxidation chamber, three heat storage chambers, a back-blowing pipe and a back-blowing machine, each heat storage chamber has three states: air intake, air outlet and back-blowing, the air inlet of the main driving fan is connected to the interior of the coating machine, the air outlet of the main driving fan is connected to the inlet of the filter chamber, the outlet of the filter chamber is connected to the inlets of the three heat storage chambers, the outlets of the three heat storage chambers are connected to the combustion oxidation chamber through a first air pipe, and each first air pipe is provided with a pneumatic butterfly valve, the outlets of the three heat storage chambers are also connected to the air inlet of the low-temperature heat exchanger through a second air pipe, the air outlet of the low-temperature heat exchanger is connected to the air inlet of the exhaust pipe, and the air outlet of the exhaust pipe is directly connected to the external atmosphere, each heat storage chamber is also connected to the air outlet of the back-blowing pipe through a second air pipe, and the inlet of the back-blowing pipe is connected to the back-blowing machine, and each back-blowing pipe is provided with a back-blowing valve. The three heat storage chambers are heat storage chamber a, heat storage chamber b and heat storage chamber c; the three pneumatic butterfly valves are pneumatic butterfly valve a, pneumatic butterfly valve b and pneumatic butterfly valve c; the three back-blow valves are back-blow valve a, back-blow valve b and back-blow valve c.

[0022] The filter chamber removes dust and sticky matter from high-concentration exhaust gas. The filtered high-concentration exhaust gas enters regenerator a for preheating. After opening pneumatic butterfly valve a, the gas enters the combustion and oxidation chamber for combustion, generating high-temperature clean gas. Regenerator b's air intake and exhaust: pneumatic butterfly valve b opens, allowing high-temperature clean gas to enter regenerator b (at this point, regenerator a is at a lower temperature). This high-temperature clean gas releases a large amount of heat to regenerator b, which absorbs the heat and then heats up and stores it (to be used to preheat the organic waste gas in the next cycle). The high-temperature clean gas becomes low-temperature clean gas. Driven by the main drive fan, the low-temperature clean gas is discharged from regenerator b, then heat-exchanged in the low-temperature heat exchanger before being discharged into the atmosphere through the exhaust pipe.

[0023] At this time, the heat storage chamber C is back-blown: the back-blowing valve a and the back-blowing valve c are opened, and a small amount of clean air exists between the back-blowing valve c and the heat storage chamber C. The back-blowing air blows the clean air back to the ceramic heat storage chamber a.

[0024] As a further improvement of the present invention, a burner and a burner ignition system are provided in the combustion and oxidation chamber. By providing the burner and the burner ignition system, the combustion of high-concentration exhaust gas can be achieved.

[0025] As a further improvement of the present invention, the system further includes a PLC control system, wherein each pneumatic butterfly valve and back-blow valve is interlocked and controlled by the PLC control system installed on the frame. The PLC control system is provided with a fault signal module, and the fault signal module is interlocked and controlled with the pneumatic butterfly valve and back-blow valve. The PLC control system is convenient for human operation.

[0026] As a further improvement of the present invention, the fresh air assembly further comprises a fresh air blower and a fresh air filter. The fresh air blower communicates with the filter chamber inlet of the regenerative thermal combustion assembly through the fresh air filter. The fresh air filter filters impurities from the atmosphere. During operation of the fresh air blower, external air passes through the fresh air filter for preliminary filtration before entering the filter chamber, where it is used to replenish fresh air during startup.

[0027] As a further improvement of the present invention, it further includes a pre-treatment component, which is used to remove dust and sticky substances contained in the low-concentration exhaust gas transported thereto by the fresh air collection device; the inlet of the pre-treatment component is connected to the interior of the coating machine through the fresh air collection cover and the fresh air collection duct, the outlet of the pre-treatment component is connected to the air inlet of the fresh air fan, and the air outlet of the fresh air fan is connected to the interior of the coating machine through the low-temperature heat exchanger and the high-temperature heat exchanger;

[0028] Or the pretreatment component is used to remove dust and sticky substances contained in the high-concentration exhaust gas transported thereto by the exhaust gas collection device; the inlet of the pretreatment component is connected to the interior of the coating machine through the exhaust gas collection pipe, and the outlet of the pretreatment component is connected to the air inlet of the main drive fan.

[0029] When the pretreatment component is used in conjunction with the fresh air collection device, the interior of the coater, the fresh air collection hood, the pretreatment component, the fresh air fan, the low-temperature heat exchanger, and the high-temperature heat exchanger are all connected through the fresh air collection duct.

[0030] The pre-treatment component filters low-concentration exhaust gas.

[0031] When the pretreatment component is used in conjunction with the exhaust gas collection device, the interior of the coating machine, the main drive fan, the pretreatment component, the regenerative combustion component, the low-temperature heat exchanger and the exhaust pipe are connected through the exhaust gas collection pipe.

[0032] The pre-treatment component performs preliminary filtration on high-concentration exhaust gas.

[0033] As a further improvement of the present invention, the pretreatment assembly includes a plate filter or a box filter, which is detachably mounted on the frame of the regenerative combustion assembly of the three-chamber RTO device via a filter clamp. The plate filter or box filter is configured to filter dust and sticky materials contained in low-concentration or high-concentration exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A side sectional view of an organic waste gas treatment system according to an embodiment of the present invention;

[0035] Figure 2 A top view of an organic waste gas treatment system according to an embodiment of the present invention;

[0036] Figure 3This is a circuit flow chart of an organic waste gas treatment system according to an embodiment of the present invention.

[0037] In the picture:

[0038] 1. Exhaust gas collection duct; 2. Three-chamber RTO device; 21. Main drive fan; 22. Regenerative combustion assembly; 221. Combustion oxidation chamber; 222. Regenerative chamber; 223. Backflush duct; 224. Backflush blower; 23. Exhaust pipe; 3. Fresh air collection device; 31. Fresh air fan; 32. Fresh air collection duct; 4. Heat exchange device; 41. Low-temperature heat exchanger; 42. High-temperature heat exchanger; 5. Hot air furnace; 6. Burner; 7. Plate filter. DETAILED DESCRIPTION

[0039] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0040] Example

[0041] See attached Figure 1-3 As shown, an organic waste gas treatment system of this embodiment includes a waste gas collection device, a three-chamber RTO device 2, a fresh air collection device 3 and a heat exchange device 4.

[0042] The exhaust gas collection device is used to collect the high-concentration exhaust gas generated when the cloth is dried inside the coating machine, and transport the high-concentration exhaust gas to the three-chamber RTO device 2; the three-chamber RTO device 2 is used to burn the high-concentration exhaust gas to obtain clean air;

[0043] The fresh air collection device 3 is used to collect low-concentration exhaust gas from the head and tail of the coating machine; the heat exchange device 4 includes a low-temperature heat exchanger 41 and a high-temperature heat exchanger 42. The low-concentration exhaust gas first undergoes a heat exchange conversion with the clean air through the low-temperature heat exchanger 41, and the low-concentration exhaust gas is initially heated, and the clean air is then discharged; then the initially heated low-concentration exhaust gas passes through the high-temperature heat exchanger 42 and undergoes a secondary heat exchange conversion with the heat in the three-chamber RTO device 2, and finally flows back to the inside of the coating machine to serve as a heat source.

[0044] During the implementation of this embodiment, when the coater is drying the cloth, the exhaust gas concentration inside the coater is higher than the exhaust gas concentration at the head and tail of the coater; therefore, the high-concentration exhaust gas referred to in this embodiment means that the exhaust gas inside the coater has a higher concentration than the exhaust gas at the head and tail of the coater, so the exhaust gas inside the coater is high-concentration exhaust gas, and the exhaust gas at the head and tail of the coater is low-concentration exhaust gas.

[0045] The collection device collects the high-concentration exhaust gas from the coater and transports it to the three-chamber RTO unit 2, where it is burned to produce clean air; the clean air is now at a low temperature. Only a small portion of the high-concentration exhaust gas from the coater is extracted each time to maintain a slight negative pressure inside the coater (the air volume per coater is 10,000 m³ / h).

[0046] The low-concentration exhaust gas emitted from the head and tail of the coating machine is collected by the fresh air collection device 3, which prevents the low-concentration exhaust gas from being directly emitted into the air and polluting the environment.

[0047] The low-temperature heat exchanger 41 works first, and after a heat exchange conversion between the low-concentration exhaust gas and the low-temperature clean gas, the low-concentration exhaust gas is initially heated up. The temperature of the initially heated low-concentration exhaust gas is 100°C, and the heat of the low-temperature clean gas is fully utilized before being discharged, avoiding waste of resources.

[0048] The high-temperature heat exchanger 42 works again to convert the initially heated low-concentration exhaust gas and the heat in the three-chamber RTO device 2 (that is, the high-temperature clean gas in the three-chamber RTO device 2) into heat for the second time. The temperature of the low-concentration exhaust gas reaches the temperature inside the coater, which is 800°C, so that the high-temperature clean gas generated by the combustion of the three-chamber RTO device 2 can be further utilized. Finally, the low-concentration exhaust gas at 800°C flows back to the inside of the coater as a heat source, ensuring that the exhaust gas concentration inside the coater is maintained between 6000-10000 mg / m3.

[0049] The organic waste gas treatment system of this embodiment has a short treatment time and a high treatment rate. Firstly, it realizes the combustion treatment of high-concentration waste gas to obtain low-temperature clean gas, and at the same time absorbs the waste heat of the low-temperature clean gas before discharging it, so as to maximize the utilization of the heat of the clean gas and improve the heat recovery rate;

[0050] Secondly, it has the effect of reducing airflow and increasing concentration. High-concentration exhaust gas and low-concentration exhaust gas are treated separately. The low-concentration exhaust gas is subjected to two heat exchanges to reach the temperature inside the coating machine, and then flows back into the coating machine as a heat source, thereby recovering the heat in the low-concentration exhaust gas to the maximum extent and further improving the heat recovery rate. It also avoids high-concentration exhaust gas and low-concentration exhaust gas from being directly emitted into the air and polluting the environment.

[0051] In one example, see Appendix Figure 2As shown, the fresh air collection device 3 includes a fresh air collection hood, a fresh air collection duct 32 and a fresh air fan 31. The fresh air fan 31 boosts and bleeds air to form an air circulation loop among the fresh air collection hood, the fresh air collection duct 32, the low-temperature heat exchanger 41, the high-temperature heat exchanger 42 and the inside of the coating machine; the high-temperature heat exchanger 42 is used to obtain heat from the combustion oxidation chamber 221 on the regenerative combustion assembly 22 on the three-chamber RTO device 2, and a waste heat pipe is also connected between the high-temperature heat exchanger 42 and the low-temperature heat exchanger 41.

[0052] The fresh air collection hood collects low-concentration exhaust gas from the head and tail of the coating machine. The fresh air collection hood, fresh air blower 31, low-temperature heat exchanger 41, high-temperature heat exchanger 42, and the interior of the coating machine are connected via a fresh air collection duct 32. As the fresh air blower 31 operates, the low-concentration exhaust gas passes through the fresh air collection hood, undergoes heat exchange twice in the low-temperature heat exchanger 41 and the high-temperature heat exchanger 42, and then flows back into the coating machine as a heat source.

[0053] Specifically, the high-temperature heat exchanger 42 receives high-temperature clean gas from the combustion and oxidation chamber 221. After the low-concentration exhaust gas, which has been initially heated, undergoes secondary heat exchange with the majority of the high-temperature clean gas, the temperature of the low-concentration exhaust gas reaches the temperature inside the coating machine, which is 800°C. The temperature inside the coating machine in this embodiment is 800°C, but is not limited to this specific temperature. Other temperatures, such as 600°C, may also be used.

[0054] At this time, the high-temperature heat exchanger 42 will also obtain a small amount of remaining high-temperature clean gas from the combustion oxidation chamber 221, and a small amount of high-temperature clean gas will enter the low-temperature heat exchanger 41 through the waste heat pipe; a small amount of high-temperature clean gas can cooperate with the low-temperature clean gas and the low-concentration exhaust gas to perform a heat exchange conversion, and the heat of the small amount of high-temperature clean gas and the low-temperature clean gas is fully utilized before being discharged, further accelerating the heating rate of the low-concentration exhaust gas.

[0055] In one example, see Appendix Figure 1 As shown, the system also includes at least one hot air furnace 5 positioned between the high-temperature heat exchanger 42 and the interior of the coating machine. The hot air furnace 5 is connected between the high-temperature heat exchanger 42 and the coating machine via the fresh air collection duct 32. The hot air furnace 5 further heats the low-concentration exhaust gas after the two heat exchanges. The presence of the hot air furnace 5 further ensures that the temperature of the low-concentration exhaust gas after the two heat exchanges reaches the temperature inside the coating machine.

[0056] In one example, see Appendix Figure 1As shown, the exhaust gas collection device includes an exhaust gas collection pipe 1; the three-chamber RTO device 2 includes a main drive fan 21, a regenerative combustion assembly 22, and an exhaust pipe 23. The main drive fan 21 pressurizes and bleeds air, forming an airflow path between the coating machine interior, the exhaust gas collection pipe 1, the regenerative combustion assembly 22, the low-temperature heat exchanger 41, and the exhaust pipe 23. The regenerative combustion assembly 22 is used to burn high-concentration exhaust gas to produce clean air. The exhaust gas collection pipe 1 connects the coating machine interior, the main drive fan 21, the regenerative combustion assembly 22, the low-temperature heat exchanger 41, and the exhaust pipe 23. When the main drive fan 21 is activated, the high-concentration exhaust gas passes through the exhaust gas collection pipe 1 and enters the regenerative combustion assembly 22 for treatment, thereby becoming low-temperature clean gas. After the low-temperature clean gas absorbs the residual heat in the low-temperature heat exchanger 41, it is finally discharged into the atmosphere through the exhaust pipe 23.

[0057] In one example, see Appendix Figure 1-3 As shown, the regenerative combustion assembly 22 includes a frame, a filter chamber arranged on the frame, a combustion oxidation chamber 221, three regenerative chambers 222, a back-blowing pipe 223 and a back-blowing blower 224. Each regenerative chamber 222 has three states: air intake, air outlet and back-blowing. The air inlet of the main driving fan 21 is connected to the inside of the coating machine, the air outlet of the main driving fan 21 is connected to the inlet of the filter chamber, the outlet of the filter chamber is connected to the inlet of the three regenerative chambers 222, and the outlets of the three regenerative chambers 222 are all connected through the first air outlet. The pipe is connected to the combustion oxidation chamber 221, and each first air pipe is equipped with a pneumatic butterfly valve. The outlets of the three heat storage chambers 222 are also connected to the air inlet of the low-temperature heat exchanger 41 through a second air pipe. The air outlet of the low-temperature heat exchanger 41 is connected to the air inlet of the exhaust pipe 23, and the air outlet of the exhaust pipe 23 is directly connected to the external atmosphere. Each heat storage chamber 222 is also connected to the air outlet of the back-blowing pipe 223 through a second air pipe, and the inlet of the back-blowing pipe 223 is connected to the back-blowing blower 224. Each back-blowing pipe 223 is equipped with a back-blowing valve. The three heat storage chambers 222 are heat storage chamber 222a, heat storage chamber 222b, and heat storage chamber 222c; the three pneumatic butterfly valves are pneumatic butterfly valve a, pneumatic butterfly valve b, and pneumatic butterfly valve c; and the three back-blowing valves are back-blowing valve a, back-blowing valve b, and back-blowing valve c.

[0058] The filter chamber's function is to filter out dust and sticky materials from high-concentration exhaust gas. When pneumatic butterfly valve a opens, the filtered, high-concentration exhaust gas enters regenerator 222a for preheating, then enters combustion and oxidation chamber 221 for combustion to generate high-temperature clean gas. Regenerator 222b's air intake and exhaust: pneumatic butterfly valve b opens again, allowing high-temperature clean gas to enter regenerator 222b (at this point, regenerator 222a is at a lower temperature). The high-temperature clean gas releases a large amount of heat to regenerator 222b, which absorbs the heat and then heats up and stores it (to be used to preheat the organic waste gas in the next cycle). The high-temperature clean gas becomes low-temperature clean gas. Driven by main drive fan 21, the low-temperature clean gas is discharged from regenerator 222b, then heat-exchanged in low-temperature heat exchanger 41 before being discharged into the atmosphere through exhaust pipe 23.

[0059] At this time, the heat storage chamber 222c is back-blown: the back-blowing valve a and the back-blowing valve c are opened, and a small amount of clean air exists between the back-blowing valve c and the heat storage chamber 222c. The back-blowing blower 224 works to blow the clean air back to the ceramic heat storage chamber 222a.

[0060] In the first cycle, high-concentration exhaust gas enters the regenerator 222a, low-temperature clean gas is discharged from the regenerator 222b, and the regenerator 222c is back-blown and cleaned;

[0061] Second cycle: high-concentration exhaust gas enters the heat storage chamber 222b, low-temperature clean gas is discharged from the heat storage chamber 222c, and the heat storage chamber 222a is back-blown and cleaned: this cycle repeats and alternates.

[0062] In one example, see Appendix Figure 3 As shown, a burner 6 and a burner ignition system are provided within the combustion and oxidation chamber 221. By providing burner 6 and the burner ignition system, high-concentration exhaust gas can be burned. The burner ignition system is conventional technology and will not be described in detail here. The temperature of the combustion and oxidation chamber 221 is between 760°C and 850°C.

[0063] In one example, a PLC control system is also included. Each pneumatic butterfly valve and back-blow valve is interlocked and controlled by a PLC control system installed on the frame. The PLC control system is equipped with a fault signal module, which is interlocked with the pneumatic butterfly valve and back-blow valve. The PLC control system is convenient for human operation. PLC control systems are conventional technology and will not be further described here.

[0064] In one embodiment, a fresh air assembly is also included. The fresh air assembly includes a fresh air blower and a fresh air filter. The fresh air blower communicates with the filter chamber inlet of the regenerative thermal combustion assembly 22 through the fresh air filter. The fresh air filter filters impurities from the atmosphere. The fresh air blower allows external air to be initially filtered by the fresh air filter before entering the filter chamber, where it is used to replenish fresh air during startup.

[0065] In one example, a pre-treatment component is further included, which is used to remove dust and sticky substances contained in the low-concentration exhaust gas delivered to it by the fresh air collection device 3; the inlet of the pre-treatment component is connected to the interior of the coating machine through the fresh air collection cover and the fresh air collection duct 32, and the outlet of the pre-treatment component is connected to the air inlet of the fresh air fan 31, and the air outlet of the fresh air fan 31 is connected to the interior of the coating machine through the low-temperature heat exchanger 41 and the high-temperature heat exchanger 42;

[0066] Or the pretreatment component is used to remove dust and sticky substances contained in the high-concentration exhaust gas transported to it by the exhaust gas collection device; the inlet of the pretreatment component is connected to the exhaust gas collection pipe 1 and the interior of the coating machine, and the outlet of the pretreatment component is connected to the air inlet of the main drive fan 21.

[0067] When the pretreatment component is used in conjunction with the fresh air collection device 3, the interior of the coater, the fresh air collection hood, the pretreatment component, the fresh air blower 31, the low-temperature heat exchanger 41, and the high-temperature heat exchanger 42 are all connected through the fresh air collection duct 32. The pretreatment component filters low-concentration exhaust gas.

[0068] When the pretreatment component is used in conjunction with the exhaust gas collection device, the interior of the coater, the main drive fan 21, the pretreatment component, the regenerative combustion component 22, the low-temperature heat exchanger 41, and the exhaust pipe 23 are connected through the exhaust gas collection pipe 1. The pretreatment component performs preliminary filtration of high-concentration exhaust gas.

[0069] In one example, see Appendix Figure 1 As shown, the pretreatment assembly includes a plate filter 7 or a box filter, which is removably mounted on the frame of the regenerative combustion assembly 22 of the three-chamber RTO unit 2 via a filter clamp. The plate filter 7 or box filter is configured to filter dust and sticky materials contained in low-concentration or high-concentration exhaust gas. The pretreatment assembly is not limited to the plate filter 7 or box filter of this embodiment; any device capable of filtering dust and sticky materials falls within the scope of this embodiment.

[0070] The regenerative combustion assembly 22 of this embodiment includes a frame, a filter chamber arranged on the frame, a combustion oxidation chamber 221 , three regenerative chambers 222 , a backflush pipe 223 and a backflush blower 224 .

[0071] Among them, the fresh air fan 31 is also set on the frame; the hot air furnace 5 is located on one side of the frame.

[0072] Among them, the main driving fan 21 and the exhaust pipe 23 are arranged on the frame; the PLC control system, the fresh air fan, the fresh air filter, and the pre-treatment component are also arranged on the frame.

[0073] The above embodiments are only for illustrating the technical concept and features of the present invention. Its purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. It cannot be used to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. An organic waste gas treatment system, characterized by: It includes an exhaust gas collection device, a three-chamber RTO device (2), a fresh air collection device (3) and a heat exchange device (4). The exhaust gas collecting device is used to collect high-concentration exhaust gas generated when the cloth is dried inside the coating machine, and transport the high-concentration exhaust gas to the three-chamber RTO device (2); the three-chamber RTO device (2) is used to burn the high-concentration exhaust gas to obtain clean gas; The fresh air collection device (3) is used to collect low-concentration exhaust gas from the head and tail of the coating machine; the heat exchange device (4) includes a low-temperature heat exchanger (41) and a high-temperature heat exchanger (42), and the low-concentration exhaust gas is first subjected to a heat exchange conversion with the clean air through the low-temperature heat exchanger (41), and the low-concentration exhaust gas is initially heated, and the clean air is then discharged; the low-concentration exhaust gas that has been initially heated is then subjected to a secondary heat exchange conversion with the heat in the three-chamber RTO device (2) through the high-temperature heat exchanger (42), and finally flows back to the inside of the coating machine to serve as a heat source; The fresh air collection device (3) includes a fresh air collection hood, a fresh air collection duct (32) and a fresh air blower (31). The fresh air blower (31) pressurizes and bleeds air, so that an air circulation loop is formed between the fresh air collection hood, the fresh air collection duct (32), the low-temperature heat exchanger (41), the high-temperature heat exchanger (42) and the inside of the coating machine; the high-temperature heat exchanger (42) is used to obtain heat from the combustion oxidation chamber (221) on the regenerative combustion assembly (22) on the three-chamber RTO device (2). The high-temperature heat exchanger (42) and the low-temperature heat exchanger (4 1) is also connected with a waste heat pipe; the exhaust gas collection device includes an exhaust gas collection pipe (1); the three-chamber RTO device (2) includes a main driving fan (21), a regenerative combustion component (22) and an exhaust pipe (23) that are connected, and the main driving fan (21) is used to pressurize and bleed air, so that an air flow path is formed between the inside of the coating machine, the exhaust gas collection pipe (1), the regenerative combustion component (22), the low-temperature heat exchanger (41) and the exhaust pipe (23); the regenerative combustion component (22) is used to burn high-concentration exhaust gas to obtain clean gas.

2. The organic waste gas treatment system according to claim 1, characterized in that: It also includes at least one hot air furnace (5) arranged between the high-temperature heat exchanger (42) and the interior of the coating machine.

3. The organic waste gas treatment system according to claim 2, characterized in that: The regenerative combustion assembly (22) comprises a frame, a filter chamber arranged on the frame, a combustion oxidation chamber (221), three regenerative chambers (222), a back-blowing pipe (223) and a back-blowing blower (224), each of the regenerative chambers (222) has three states: air intake, air outlet and back-blowing. The air inlet of the main driving fan (21) is connected to the interior of the coating machine, the air outlet of the main driving fan (21) is connected to the inlet of the filter chamber, the outlet of the filter chamber is connected to the inlets of the three regenerative chambers (222), and the outlets of the three regenerative chambers (222) are all connected through the first air outlet. The pipe is connected to the combustion oxidation chamber (221) and each first air pipe is provided with a pneumatic butterfly valve. The outlets of the three heat storage chambers (222) are also connected to the air inlet of the low-temperature heat exchanger (41) through the second air pipe. The air outlet of the low-temperature heat exchanger (41) is connected to the air inlet of the exhaust pipe (23), and the air outlet of the exhaust pipe (23) is directly connected to the external atmosphere. Each heat storage chamber (222) is also connected to the air outlet of the back-blowing pipe (223) through the second air pipe, and the inlet of the back-blowing pipe (223) is connected to the back-blowing blower (224). Each back-blowing pipe (223) is provided with a back-blowing valve.

4. The organic waste gas treatment system according to claim 1, characterized in that: A burner (6) and a burner ignition system are provided in the combustion and oxidation chamber (221).

5. The organic waste gas treatment system according to claim 3, characterized in that: It also includes a PLC control system, and each of the pneumatic butterfly valves and back-blow valves is interlocked and controlled by a PLC control system arranged on a frame. The PLC control system is provided with a fault signal module, and the fault signal module is interlocked and controlled with the pneumatic butterfly valve and back-blow valve.

6. The organic waste gas treatment system according to claim 2, characterized in that: It also includes a fresh air component, which includes a fresh air blower and a fresh air filter. The fresh air blower is connected to the filter chamber inlet of the thermal storage combustion component (22) through the fresh air filter.

7. An organic waste gas treatment system according to claim 1 or 2, characterized in that: It also includes a pre-treatment component, which is used to remove dust and sticky substances contained in the low-concentration exhaust gas transported to it by the fresh air collection device (3); the inlet of the pre-treatment component is connected to the interior of the coating machine through the fresh air collection cover and the fresh air collection pipe (32), the outlet of the pre-treatment component is connected to the air inlet of the fresh air fan (31), and the air outlet of the fresh air fan (31) is connected to the interior of the coating machine through the low-temperature heat exchanger (41) and the high-temperature heat exchanger (42); Or the pretreatment component is used to remove dust and sticky substances contained in high-concentration exhaust gas delivered to it by the exhaust gas collection device; the inlet of the pretreatment component is connected to the interior of the coating machine through the exhaust gas collection pipe (1), and the outlet of the pretreatment component is connected to the air inlet of the main driving fan (21).

8. The organic waste gas treatment system according to claim 7, characterized in that: The pretreatment assembly comprises a plate filter (7) or a box filter, and the plate filter (7) or the box filter is detachably arranged on the frame of the regenerative combustion assembly (22) of the three-chamber RTO device (2) via a filter pressing device.

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