A device for treating organic waste gas

Abstract

The present application discloses an organic waste gas treatment device, comprising: an organic waste gas intake pipe connected to the exhaust gas outlet of a paint immersion furnace, a waste heat return pipe connected to the hot air inlet of the paint immersion furnace, and a filter, a catalytic chamber, a centrifugal fan, and an external heat exchanger for connecting a control system respectively are sequentially connected between the organic waste gas intake pipe and the waste heat return pipe along the gas flow direction; the catalytic chamber receives the particle-free organic waste gas filtered by the filter and heats it to the reaction temperature for catalytic combustion reaction to produce harmless hot gas, absorbs part of the heat in the harmless hot gas to heat the particle-free organic waste gas, and then cools the harmless hot gas to catalytic tail gas for discharge; the external heat exchanger absorbs the heat in the catalytic tail gas, controls the temperature of the extracted external air to heat it to form oxygen-containing hot air for transport back to the furnace, and at the same time, the catalytic tail gas after the heat is absorbed is formed into standard tail gas for external discharge. Therefore, the present invention recovers the heat in the organic waste gas for use in the paint immersion furnace and makes the organic waste gas meet the discharge standards.

Description

Technical Field

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

[0002] Processing and producing motors, using sand steel sheets to stack rotors and stators according to different product requirements, the rotors are stacked and then enter the die-casting machine. The die-casting machine is equipped with a furnace to melt the aluminum precipitate and inject it into the die-casting machine to seal the stacked rotors. After sealing, the semi-finished rotors are pressed and processed, and then the bearings are manually installed after dynamic balancing inspection to become the finished rotors. After winding, the electromagnetic wire is embedded in the stacked stator semi-finished products together with the processed insulation materials. After a series of binding, shaping and wiring, the stator semi-finished products enter the varnishing production line for painting, and after drying and testing, they become the finished stator products. The project uses cold plates, and according to the requirements of the shells of different motor products, the motor shells are made through stamping or reel production lines. Finally, the rotors, stators and shells are assembled into finished products through the whole assembly production line.

[0003] The production of motors will generate VOCs during the varnishing process, which requires the use of insulating varnish and thinner. This process will volatilize a large amount of VOCs. At present, the industry uses the "spray tower + activated carbon adsorption" treatment process for the organic waste gas generated by the varnishing process. This process has low removal efficiency and the organic waste gas cannot be stably discharged to meet the standards. Summary of the invention

[0004] (I) Purpose of the invention

[0005] The purpose of the present invention is to provide an organic waste gas treatment device, which can achieve emission standards for organic waste gas through a combined treatment method of "direct catalytic combustion + heat recovery", and also recover the heat after catalytic combustion to be used in a paint immersion furnace, thereby saving the electricity used for heating the paint immersion furnace.

[0006] (II) Technical solution

[0007] In order to achieve the above object, the present invention adopts the following technical solution to provide:

[0008] An organic waste gas treatment device, comprising:

[0009] An organic waste gas intake pipe connected to the waste gas outlet of the paint dipping furnace and a waste heat return pipe connected to the hot air inlet of the paint dipping furnace, and a filter, a catalyst chamber, a centrifugal fan, and an external heat exchanger for connecting to the control system respectively are connected in sequence between the organic waste gas intake pipe and the waste heat return pipe along the gas flow direction; the filter is used to filter the particulate matter in the organic waste gas transported by the organic waste gas intake pipe to output particle-free organic waste gas; the catalyst chamber receives the particle-free organic waste gas and heats it to the reaction temperature for catalytic combustion reaction to produce harmless hot gas, absorbs part of the heat in the harmless hot gas to heat the particle-free organic waste gas, and then cools the harmless hot gas to be discharged as catalytic exhaust gas; after the centrifugal fan transports the catalytic exhaust gas to the external heat exchanger, the external heat exchanger absorbs the heat in the catalytic exhaust gas, controls the temperature and heats the extracted external air to form oxygen-containing hot air, and then transports it back to the furnace through the waste heat return pipe, and at the same time, the catalytic exhaust gas after the heat is absorbed is discharged as qualified exhaust gas.

[0010] The principle of catalytic combustion is as follows: using a catalyst as an intermediate, the organic waste gas is converted into harmless water and carbon dioxide gas at a lower temperature, namely:

[0011]

[0012] Among them, catalytic combustion is essentially a gas-solid phase reaction, which allows active oxygen to participate in deep oxidation. In the process of catalytic combustion, the role of the catalyst is to reduce the activation energy. At the same time, the catalyst surface has an adsorption effect, which enriches the reactant molecules on the surface, increases the reaction rate, and accelerates the reaction. Therefore, with the help of the catalyst, organic waste gas can be flamelessly burned under low ignition temperature conditions, and oxidized and decomposed into carbon dioxide and water, while releasing a large amount of heat energy, with high efficiency and no secondary pollution. Among them, the control system controls the catalyst chamber, centrifugal fan, and external heat exchanger. The heating and catalytic temperature control of the catalyst chamber are fully automatically controlled by the PLC program of the control system to ensure that the outlet gas temperature meets the technical design requirements, not only to ensure that the organic waste gas meets the emission standards, but also to recover the heat after catalytic combustion to the paint dipping furnace for use, effectively saving the electricity used for heating the paint dipping furnace.

[0013] Therefore, in view of the characteristics of organic waste gas in the paint dipping process of the motor manufacturing industry: high organic waste gas concentration, small air volume and high calorific value, the present invention adopts a combined process of "direct catalytic combustion + heat recovery", and sets a filter to filter particulate matter in the organic waste gas. The organic waste gas particulate matter is mainly dust and condensed oily substances in the organic waste gas dried by the paint dipping furnace. The catalyst chamber is used to catalytically burn and decompose the organic waste gas to produce harmless hot gas. The centrifugal fan is used to extract and transport the harmless hot gas to an external heat exchanger to provide gas transportation power. The external heat exchanger extracts external oxygen-containing hot air to absorb heat from the harmless hot gas, so that the oxygen-containing hot air is heat-exchanged to oxygen-containing hot air that matches the paint dipping furnace for paint combustion temperature requirements, and then transported back to the furnace for recycling, thereby realizing heat recovery and utilization. At the same time, the harmless hot gas is formed into harmless and qualified exhaust gas and discharged to the outside, thereby achieving the purpose of qualified emissions.

[0014] In some embodiments, the catalytic chamber includes: an internal heat exchanger connected downstream of the filter, which absorbs heat to heat the particle-free organic waste gas flowing into the internal heat exchanger to form preheated waste gas before discharging it; a heater connected to one side of the internal heat exchanger, which receives an instruction from the control system to perform compensatory heating on the preheated waste gas, and then powers on to heat and control the temperature of the preheated waste gas passing through the heater to output a reaction waste gas that reaches a catalytic combustion reaction temperature; a catalytic chamber, which is arranged below the heater and connected to the internal heat exchanger, receives the reaction waste gas for a catalytic combustion reaction to generate harmless hot gas with combustion heat, and when the harmless hot gas flows through the internal heat exchanger, a portion of the heat is absorbed to form a catalytic tail gas that is discharged from the catalytic chamber.

[0015] Therefore, after the organic waste gas passes through the filter to remove particulate matter in the organic waste gas, it enters the internal heat exchanger through the catalyst chamber for heating, and then is compensated by the heater to make the organic waste gas reach the combustion reaction temperature, and then the catalyst of the catalyst bed decomposes the organic waste gas to produce heat, carbon dioxide and water; the heat generated by the decomposition enters the internal heat exchanger to exchange heat with the organic waste gas to realize the utilization of the heated heat energy, so that the temperature of the entering organic waste gas is increased to reach the reaction temperature; after heating, if the temperature of the organic waste gas does not reach the reaction temperature, the heater can realize compensatory heating through the automatic control system, so that the temperature of the organic waste gas reaches the reaction temperature for complete combustion, which saves energy and the effective removal rate of organic waste gas reaches the emission standard, which meets the national emission standards.

[0016] In some embodiments, the catalytic chamber further includes: a honeycomb ceramic insulation layer, which is docked at one side of the heater outputting the reaction exhaust gas and is arranged above the catalytic chamber; a plurality of honeycomb holes arranged in a mesh pattern and having the same aperture are opened on the honeycomb ceramic insulation layer; the honeycomb holes are laterally docked with the heater; when the reaction exhaust gas flows laterally and contacts the inner wall of the honeycomb holes, it is heated by the inner wall or absorbs heat to release heat and store heat.

[0017] Among them, the honeycomb ceramic insulation layer uses multiple honeycomb holes to form a porous thin-walled honeycomb ceramic shape through axial abutment and the same pore size, which greatly increases the geometric surface area of ​​the carrier and improves the thermal shock resistance; furthermore, the honeycomb holes can increase the thermal shock resistance and thermal shock damage temperature of the honeycomb ceramic insulation layer as the number of holes per unit area increases and the thickness of the carrier pore wall decreases, and can further store and release heat for the reaction exhaust gas, save electricity by reducing heat loss, and effectively reduce the amount of power-on heating of the heater. As a result, the honeycomb ceramic insulation layer can absorb heat from the organic waste gas between the heater and the catalytic bin to store and release heat for the heated or compensated heated organic waste gas, so that the organic waste gas that has been compensated heated can reach the reaction temperature without the need for heater compensation heating, so that the organic waste gas that has reached the reaction temperature can flow to the catalytic bin for catalytic combustion reaction, realizing the heat recovery characteristics of circular energy saving and environmental protection.

[0018] In some embodiments, an exhaust gas circulation cavity is provided between the honeycomb ceramic insulation layer and the catalytic chamber for mixing and circulating the reaction exhaust gas. A pressure relief and explosion-proof component connected to the control system is provided in the exhaust gas circulation cavity. The pressure relief and explosion-proof component is installed on the side of the catalytic chamber and connected to the outside to detect the exhaust gas pressure in the exhaust gas circulation cavity for exhaust pressure relief.

[0019] Therefore, when the control system detects that the temperature of the reaction exhaust gas flowing from the exhaust gas circulation chamber to the catalytic chamber is too high, the control system controls the opening of the pressure relief and explosion-proof parts to add air to the exhaust gas circulation chamber to reduce the temperature of the organic exhaust gas, thereby preventing the temperature of the catalytic chamber from being too high and failing to stably carry out the catalytic combustion reaction.

[0020] In some embodiments, the present invention comprises: a first temperature measuring component, a second temperature measuring component, and a third temperature measuring component respectively connected to the control system, the first temperature measuring component being arranged between the internal heat exchanger and the heater, for measuring the current temperature of the preheated exhaust gas flowing to the heater and forming a first temperature measurement information and sending it to the control system, and the control system controls the electric heating time and heating temperature of the heater for controlling the temperature of the preheated exhaust gas according to the first temperature measurement information; the second temperature measuring component being arranged between the heater and the catalytic chamber, for measuring the current temperature of the reaction exhaust gas flowing to the catalytic chamber and forming a second temperature measurement information and sending it to the control system, and the control system controls the electric heating time and heating temperature of the heater for controlling the temperature of the preheated exhaust gas according to the second temperature measurement information; the third temperature measuring component being arranged between the catalytic chamber and the internal heat exchanger, for measuring the current temperature of the harmless hot gas flowing to the internal heat exchanger and forming a third temperature measurement information and sending it to the control system, and the control system controls the power-on time and heating temperature of the internal heat exchanger for heating the preheated exhaust gas according to the third temperature measurement information.

[0021] Therefore, when the control system detects through the first temperature measuring component that the temperature of the organic waste gas after being heated by the internal heat exchanger reaches the predetermined catalytic temperature of 300℃~350℃, the control system automatically stops the heating of the heater; when it is measured that the temperature of the organic waste gas after being heated by the internal heat exchanger does not reach the predetermined catalytic reaction temperature, the control system starts the heater to perform compensatory heating on the organic waste gas to maintain the catalytic temperature of the organic waste gas at 300℃~350℃; when the control system detects through the second temperature measuring component that the reaction waste gas temperature in the waste gas circulation chamber is too high, it can be detected that the temperature of the catalytic bin is too high. At this time, the control system controls the opening of the pressure relief and explosion-proof component to supplement air into the waste gas circulation chamber to reduce the temperature of the organic waste gas, thereby preventing the temperature of the catalytic bin from being too high.

[0022] In some embodiments, the internal heat exchanger is tilted and abutted against the inside of the catalytic chamber and a heat insulation plate is connected to one side of the internal heat exchanger, the heater is installed between the heat insulation plate and the top surface of the catalytic chamber, the catalytic chamber is abutted against the heat insulation plate and the bottom surface of the catalytic chamber, and the two sides of the catalytic chamber are respectively connected to the internal heat exchanger and the heater; the catalytic chamber is provided with a side air inlet and an upper exhaust port, the internal heat exchanger is provided with a waste gas inlet connected to the side air inlet for receiving particulate-free organic waste gas, a waste gas outlet connected to the waste gas inlet and connected to the heater for outputting preheated waste gas, a harmless hot gas inlet connected to the catalytic chamber for receiving harmless hot gas, and a harmless hot gas outlet connected to the harmless hot gas inlet and the upper exhaust port for outputting catalytic exhaust gas.

[0023] Thus, the organic waste gas is connected to the waste gas inlet through the side air inlet through the air inlet cavity in the catalytic chamber, and then enters the internal heat exchanger through the waste gas inlet for heating to reach a reaction temperature of 300°C-350°C to form reaction waste gas. The 300°C-350°C reaction waste gas flows from the waste gas outlet of the internal heat exchanger to the heating cavity in the catalytic chamber, and the organic waste gas that does not reach the reaction temperature is supplementarily heated by the heater in the heating cavity to reach the reaction temperature. The 300°C-350°C reaction waste gas flows through the heating cavity to the decomposition cavity in the catalytic chamber, and the decomposition cavity transfers the 300°C-350°C organic waste gas to the decomposition cavity in the catalytic chamber through the catalytic chamber. ℃ reaction waste gas is catalytically burned and decomposed to produce harmless hot gas of 450℃-550℃. At this time, the harmless hot gas of 450℃-550℃ flows from the decomposition chamber into the internal heat exchanger through the harmless hot gas inlet, absorbs 60% of the heat and forms oxygen-free tail gas of 220℃-300℃. The oxygen-free tail gas of 220℃-300℃ is discharged into the gas outlet cavity in the catalytic chamber through the harmless hot gas outlet, and the gas outlet cavity discharges the oxygen-free tail gas of 220℃-300℃ to the outside through the upper exhaust port, and the absorbed heat in the internal heat exchanger is used to heat the filtered organic waste gas to 250℃-300℃.

[0024] In some embodiments, the external heat exchanger is provided with an oxygen-free exhaust gas inlet for connecting to a centrifugal fan, a harmless exhaust gas outlet for connecting between the oxygen-free exhaust gas inlet and the exhaust pipe, an external heat exchanger inlet for connecting to the outside, and a hot air outlet for connecting between the external heat exchanger inlet and the blower; the harmless gas enters the external heat exchanger through the oxygen-free exhaust gas inlet for heat exchange and cooling to form qualified exhaust gas, which is then discharged to the outside through the harmless exhaust gas outlet via the exhaust pipe; the external heat exchanger inlet serves as a cold air inlet to allow external air to enter the external heat exchanger for heat exchange and heating to form oxygen-containing hot air, and then the oxygen-containing hot air is transported back to the furnace through the hot air outlet through the waste heat reflux pipe under the transport power of the blower.

[0025] Among them, the oxygen-free exhaust gas transported by the centrifugal fan enters the external heat exchanger through the oxygen-free exhaust gas inlet. After receiving the oxygen-free exhaust gas, the external heat exchanger absorbs about 35% of the heat in the oxygen-free exhaust gas and makes the oxygen-free exhaust gas meet the standards and discharges it from the harmless exhaust gas outlet. Among them, the remaining heat in the discharged standard exhaust gas can be used for other heat recovery. At the same time, the external heat exchanger reuses part of the heat absorbed from the oxygen-free exhaust gas: the outside air enters the external heat exchanger through the external heat exchanger inlet, and absorbs part of the heat of the oxygen-free exhaust gas by the external heat exchanger. After being heated and heated, it forms oxygen-containing hot air, and the oxygen-containing hot air is transported back to the furnace for utilization through the waste heat reflux pipe from the hot air outlet under the action of the blower.

[0026] In some embodiments, it includes: a dust removal flame arrester, which is connected between the filter and the catalyst chamber through a pipeline and connected to a control system, and connects or cuts off the connecting pipeline between the catalyst chamber and the filter by detecting the gas flow direction in the pipeline. The dust removal flame arrester is arranged at the air inlet end of the catalyst chamber to prevent the combustion wind from flowing back to the workshop along the pipeline to affect the normal operation of the workshop, prevent fire accidents in the equipment, and ensure the safe progress of the catalytic combustion reaction in the catalyst chamber.

[0027] In some embodiments, the dust removal flame arrester and the filter are provided with an emptying valve, the filter and the organic waste gas intake pipe are connected with a switch valve, and the switch valve and the emptying valve are respectively connected to the control system. Thus, the emptying valve can cooperate with the centrifugal fan to further realize the purification function before the operation of the organic waste gas treatment device and prevent accidental explosion. Through the air intake and exhaust functions of the emptying valve and the centrifugal fan, the pipeline (air duct), the catalytic chamber, etc. are purged clean with air to prevent accidental explosion during catalytic combustion.

[0028] In some embodiments, an organic waste gas inlet pipe outputs organic waste gas at 30°C-40°C, which is heated by an internal heat exchanger to become preheated waste gas at 250°C-300°C, and the preheated waste gas at 250°C-300°C is temperature-controlled by a heater to form a reaction waste gas at 300°C-350°C, and the reaction waste gas at 300°C-350°C is catalytically burned and decomposed into harmless hot gas at 450°C-500°C by a catalytic bin, and a portion of the heat of the harmless hot gas at 450°C-500°C is absorbed by the internal heat exchanger to form oxygen-free exhaust gas at 220°C-300°C, which is transported to an external heat exchanger via a centrifugal fan, and the external heat exchanger absorbs a portion of the heat of the oxygen-free exhaust gas at 220°C-300°C to make external air into oxygen-containing hot air at 120°C-150°C for transport back to the furnace, and then the catalytic exhaust gas after the heat is absorbed is discharged as a qualified exhaust gas at 80°C-130°C.

[0029] Thus, the low-temperature organic waste gas of 30℃-40℃ outputted from the lacquer dipping furnace workshop passes through a filter to remove particulate matter in the organic waste gas, and then enters the internal heat exchanger through a catalyst chamber to be heated to 250℃-350℃, so that the organic waste gas reaches a reaction temperature of 300℃-350℃. The organic waste gas reaching the reaction temperature of 300℃-350℃ is decomposed into harmless hot gas of 450℃-500℃ by the catalyst of the catalyst bed. The harmless hot gas of 450℃-500℃ enters the internal heat exchanger again to exchange heat with the low-temperature organic waste gas of 30℃-40℃ that enters the internal heat exchanger for the first time, so as to realize heat energy recovery and utilization, so that the temperature of the organic waste gas without particulate matter after filtration is increased to reach the reaction temperature; during heating, If the temperature of the organic waste gas does not reach the reaction temperature, the heater can achieve compensatory heating through the automatic control system. After the temperature of the organic waste gas reaches the reaction temperature, the catalyst can be used to make the organic waste gas release a large amount of heat energy at a lower ignition temperature to form harmless hot gas of 450℃-500℃. The harmless hot gas of 450℃-500℃ absorbs part of the heat through the internal heat exchanger and forms oxygen-free tail gas of 220℃-300℃ for discharge. The oxygen-free tail gas of 220℃-300℃ is converted from external air into oxygen-containing hot air of 120℃-150℃ through the external heat exchanger and transported back to the furnace to form standard tail gas of 80℃-130℃ for discharge to the outside, achieving standard emission, high organic waste gas recovery efficiency and no secondary pollution.

[0030] In some embodiments, it includes: an air volume regulating valve, which is connected between the catalyst chamber and the centrifugal fan through a pipeline and connected to a control system, and is used to detect the wind pressure change of the harmless hot air in the pipeline and generate wind pressure information to send to the control system. The control system controls the air volume regulating valve to adjust the cross-sectional area of ​​the connecting pipeline according to the wind pressure information, so that the harmless hot air can flow stably to the external heat exchanger under negative pressure.

[0031] Among them, the air volume regulating valve is built with a frequency converter connected to the pipeline and a silicon capsule located in the middle of the frequency converter. The constant flow function of the air volume regulating valve is to achieve the size of the pipe diameter connected to the pipeline through the contraction and expansion / contraction of the silicon capsule located in the middle of the frequency converter, thereby controlling the ventilation volume and wind pressure. Therefore, the control system can connect the frequency converter through the wind pressure controller to achieve the purpose of controlling the wind pressure in the pipeline by using the air volume regulating valve by controlling the frequency converter. Therefore, when the wind pressure and air volume change, the air volume regulating valve automatically adjusts the cross-sectional area connected to the pipeline through the command information of the control system, so that the downstream air volume and the reverse air volume in the pipeline are stable so that the harmless hot air transported in the pipeline is kept within a stable wind pressure range, further ensuring the stability of the exhaust gas treatment work in the entire exhaust gas treatment device, simple maintenance, and stable operation.

[0032] In some embodiments, a method for treating waste gas of an organic waste gas treatment device comprises the following steps:

[0033] Filtration: The organic waste gas output from the lacquer dipping furnace is transported to the filter through the organic waste gas intake pipe to remove particulate matter in the organic waste gas;

[0034] Anti-flashback: The organic waste gas with particulate matter filtered out is transported to the catalyst chamber through the dust removal flame arrester;

[0035] Preheating: The internal heat exchanger arranged obliquely in the catalytic chamber is connected to the dust removal flame arrester 4 through a pipeline, and the internal heat exchanger receives the organic waste gas with particulate matter filtered out, and heats the organic waste gas to form preheated waste gas;

[0036] Compensation heating: A heater is connected to the upper side of the internal heat exchanger, and the heater performs compensation heating on the preheated exhaust gas that has not reached the reaction temperature to form reaction exhaust gas that reaches the reaction temperature;

[0037] Heat storage and heat release: connect one side of the heater to the honeycomb ceramic insulation layer, so that the heated reaction exhaust gas can pass through the honeycomb ceramic insulation layer to store and release heat to maintain the reaction temperature;

[0038] Catalytic combustion: a catalytic chamber is arranged below the honeycomb ceramic insulation layer and the heater, one side of the catalytic chamber is connected to the honeycomb ceramic insulation layer through the exhaust gas flow cavity, and the catalytic chamber receives the reaction exhaust gas reaching the reaction temperature to perform catalytic combustion reaction to generate harmless hot gas;

[0039] Primary heat exchange: the catalytic chamber is connected to the lower side of the internal heat exchanger, the internal heat exchanger receives the harmless hot gas discharged from the catalytic chamber, and receives a part of the heat in the harmless hot gas to preheat the organic waste gas in step S3, and discharges the other part of the harmless hot gas from the catalytic chamber, that is, the internal heat exchanger reduces the harmless hot gas to form harmless tail gas for discharge;

[0040] Transport: connect the catalyst chamber to the centrifugal fan, which transports the harmless exhaust gas to the external heat exchanger;

[0041] Secondary heat exchange, heat energy recovery: A blower is arranged between the external heat exchanger and the waste heat return pipe. The external heat exchanger absorbs part of the heat of the oxygen-free tail gas and converts the external air into oxygen-containing hot air, which is then transported back to the furnace through the waste heat return pipe under the power of the blower for recycling;

[0042] Exhaust: Connect the external heat exchanger with the exhaust pipe. The external heat exchanger will convert the catalytic exhaust gas after absorbing heat into qualified exhaust gas and discharge it outside through the exhaust pipe.

[0043] Among them, the temperature of the organic waste gas output from the organic waste gas inlet pipe is 30℃-40℃, and the organic waste gas at 30℃-40℃ is heated to 250℃-300℃ through the internal heat exchanger, wherein the organic waste gas at 250℃-300℃ is heated by the heater to reach the organic waste gas with a reaction temperature of 300℃~350℃, and the organic waste gas at 300℃~350℃ is catalytically burned in the catalytic bin to become harmless hot gas with a temperature of 450℃-500℃, and the harmless hot gas at 450℃-500℃ is heat-exchanged through the internal heat exchanger to become oxygen-free exhaust gas at 220℃-300℃, and the oxygen-free exhaust gas at 220℃-300℃ is absorbed by the external heat exchanger to form qualified exhaust gas and discharged to the outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a structural schematic diagram of an organic waste gas treatment device according to an embodiment of the present invention;

[0045] Figure 2 This is a plan view of an organic waste gas treatment device according to an embodiment of the present invention;

[0046] Figure 3 This is a schematic diagram of a process of an organic waste gas treatment device according to an embodiment of the present invention;

[0047] Figure 4 is another schematic diagram of a process of an organic waste gas treatment device according to an embodiment of the present invention;

[0048] Figure 5 is an internal side view of a catalyst chamber according to an embodiment of the present invention;

[0049] Figure 6 is a schematic diagram of the internal three-dimensional structure of a catalyst chamber according to an embodiment of the present invention;

[0050] Figure 7 is a schematic structural diagram of an external heat exchanger according to an embodiment of the present invention;

[0051] Figure 8 It is a front view of a honeycomb ceramic thermal insulation layer according to an embodiment of the present invention.

[0052] Reference numerals:

[0053] Organic waste gas intake pipe; 2. Waste heat return pipe; 3. Filter; 4. Dust removal flame arrester; 5. Catalytic chamber; 511. Side air inlet; 512. Upper exhaust port; 513. Air intake chamber; 514. Heating chamber; 515. Decomposition chamber; 516. Air outlet chamber; 517. Waste gas circulation chamber; 52. Internal heat exchanger; 521. Waste gas inlet; 522. Waste gas outlet; 523. Harmless hot gas inlet; 524. Harmless hot gas outlet; 53. Heater; 54. Honeycomb Ceramic insulation layer; 55. Catalytic chamber; 56. Pressure relief explosion-proof parts; 57. Support plate; 58. Partition; 59. Pneumatic valve; 501. First temperature measuring part; 502. Second temperature measuring part; 503. Third temperature measuring part; 6. Centrifugal fan; 7. External heat exchanger; 71. Oxygen-free exhaust gas inlet; 72. Harmless exhaust gas outlet; 73. External heat exchanger inlet; 74. Hot air outlet; 8. Exhaust pipe; 9. Switch valve; 10. Exhaust valve; 11. Air volume regulating valve. DETAILED DESCRIPTION

[0054] The following further describes the specific implementation modes of the present invention in conjunction with the accompanying drawings of the specification to make the technical solutions and beneficial effects of the present invention clearer and more specific.

[0055] See also Figure 1-8An organic waste gas treatment device of the present embodiment shown includes: an organic waste gas inlet pipe 1, a waste heat reflux pipe 2, a filter 3, a dust removal flame arrester 4, a catalyst chamber 5, a centrifugal fan 6, an external heat exchanger 7, and an exhaust pipe 8. Specifically: in the present embodiment, the organic waste gas intake pipe 1 is connected to the waste gas outlet of the paint dipping furnace, the waste heat return pipe 2 is connected to the hot air inlet of the paint dipping furnace, and a filter 3, a dust removal flame arrester 4, a catalyst chamber 5, a centrifugal fan 6, and an external heat exchanger 7 are sequentially arranged between the organic waste gas intake pipe 1 and the waste heat return pipe 2. The filter 3, the dust removal flame arrester 4, the catalyst chamber 5, the centrifugal fan 6, and the external heat exchanger 7 are respectively connected to a control system (not shown in the figure); wherein, the gas flow direction and the heat energy flow direction in the organic waste gas intake pipe 1 and the waste heat recovery pipe 2 are set to the same direction: a switch valve 9 is provided on one side of the filter 3 to connect to the organic waste gas intake pipe 1, and an emptying valve 10 is provided on the other side of the filter 3 to connect to the dust removal flame arrester 4, the dust removal flame arrester 4 is connected to the catalyst chamber 5, the catalyst chamber 5 is connected to the external heat exchanger 7 through the centrifugal fan 6, one side of the external heat exchanger 7 is connected to the waste heat return pipe 2 through the blower 12, and an exhaust pipe 8 connected to the outside is provided on the other side of the external heat exchanger 7. In the present invention, the filter 3 is connected to the outlet end of the organic waste gas inlet pipe 1 to filter particulate matter in the organic waste gas, the dust removal flame arrester 4 is used to prevent the combustion hot air in the catalyst chamber 5 from flowing back to the workshop through the pipeline to affect the safe operation of the workshop, and the catalyst chamber 5 is connected between the filter 3 and the centrifugal fan 6. The catalyst chamber 5 is used to heat the organic waste gas so that it can be catalytically burned and decomposed to produce harmless hot air. At the same time, the catalyst chamber 5 absorbs part of the heat of the harmless hot air to heat the particle-free organic waste gas, so that the harmless hot air generated by the catalytic combustion and decomposition of the particle-free organic waste gas is After cooling to form harmless exhaust gas, it is discharged from the catalyst chamber 5. The centrifugal fan extracts the harmless exhaust gas from the catalyst chamber 5 and transports it to the external heat exchanger 7, wherein the external heat exchanger 7 is connected to the waste heat reflux pipe 2 through the blower 12, so that the oxygen-containing hot air absorbs the heat of the harmless exhaust gas through the external heat exchanger 7 to form oxygen-containing hot air, and the oxygen-containing hot air is transported back to the paint dipping furnace through the waste heat reflux pipe 2 to achieve heat recycling. Furthermore, an exhaust pipe 8 connected to the outside is provided on one side of the external heat exchanger 7, and the exhaust gas that meets the standards is discharged through the exhaust pipe 8 and meets the emission standards.

[0056] like Figure 5-6As shown, in this embodiment, the internal heat exchanger 52, the heater 53, and the catalytic chamber 55 are all arranged in the catalytic chamber 5. Specifically, a side air inlet 511 and an upper air outlet 512 are opened on the catalytic chamber 5. The side air inlet 511 is connected to the dust removal flame arrester 4 through a pipeline, and the upper air outlet 512 is connected to the centrifugal fan 6 through a pipeline. The side air inlet 511 and the upper air outlet 512 are respectively arranged at the upper and lower sides of the same side of the internal heat exchanger 52 and are connected through the internal heat exchanger 52. The internal heat exchanger 52 receives the filtered organic matter through the side air inlet 511. The internal heat exchanger 52 is provided with a heater 53 on the other side thereof, and the heater 53 is used to compensate and heat the heated organic waste gas which has not reached the reaction temperature after the heat exchange through the internal heat exchanger 52 to the reaction temperature; a catalytic bin 55 is provided below the heater 53, and a catalyst which can catalyze combustion reaction with the reaction waste gas flowing into the catalytic bin 55 is placed in the catalytic bin 55, and the harmless hot gas generated by decomposition in the catalytic bin 55 is discharged through the other side of the internal heat exchanger 52 through the upper exhaust port 512.

[0057] like Figure 5-6 As shown, in this embodiment, the catalytic chamber 5 also includes: a first temperature measuring component 501, a second temperature measuring component 502, and a third temperature measuring component 503, and the first temperature measuring component 501, the second temperature measuring component 502, and the third temperature measuring component 503 are respectively connected to the control system. Among them: the first temperature measuring component 501 is arranged between the internal heat exchanger 52 and the heater 53, and is used to measure the temperature of the organic waste gas after heating; the second temperature measuring component 502 is arranged between the heater 53 and the catalytic chamber 55, and is used to measure the temperature of the organic waste gas undergoing catalytic combustion decomposition in the catalytic chamber; the third temperature measuring component 503 is arranged between the catalytic chamber 55 and the internal heat exchanger 52, and is used to measure the temperature of the harmless hot gas generated by the catalytic combustion decomposition. Specifically: the first temperature measuring component 501 is installed on the top surface of the catalytic chamber 5, the second temperature measuring component 502 is installed on the side of the catalytic chamber 5, and the third temperature measuring component 503 is installed on the bottom surface of the catalytic chamber 5.

[0058] Thus, the control system controls the above-mentioned temperature measuring components, the internal heat exchanger 52, and the heater 53. Specifically: when the control system detects through the first temperature measuring component 501 that the temperature of the organic waste gas currently heated by the internal heat exchanger 52 reaches the predetermined catalytic temperature, the control system automatically stops the supplementary heating of the heater 53; when the control system detects through the first temperature measuring component 501 that the temperature of the organic waste gas currently heated by the internal heat exchanger 52 does not reach the predetermined catalytic temperature, the control system starts the heater 53 for compensatory heating to reach the reaction temperature; when the control system detects through the second temperature measuring component 502 that the temperature of the organic waste gas in the current catalytic chamber 55 is too high, the control system stops the heating of the heater or supplements air into the catalytic chamber 5 through the pressure relief explosion-proof component 56 to prevent the temperature of the catalytic chamber 55 from being too high; when the control system detects through the third temperature measuring component 501 that the temperature of the organic waste gas currently heated by the internal heat exchanger 52 does not reach the predetermined catalytic temperature, the control system starts the heater 53 for compensatory heating to reach the reaction temperature; when the control system detects through the second temperature measuring component 502 that the temperature of the organic waste gas in the current catalytic chamber 55 is too high, the control system stops the heating of the heater or supplements air into the catalytic chamber 5 through the pressure relief explosion-proof component 56 to prevent the temperature of the catalytic chamber 55 from being too high The temperature component 503 detects the temperature of the harmless hot air currently generated by the catalytic combustion decomposition, and can control the internal heat exchanger 52 to be powered on or off for heating so as to preheat the filtered organic waste gas. When the third temperature measuring component 503 detects that the temperature of the catalytic combustion decomposition reaches a certain temperature value, the control system can control the internal heat exchanger 52 to directly use the heat generated by the catalytic combustion decomposition to preheat the organic waste gas without being powered on for heating. When the third temperature measuring component 503 detects that the temperature of the catalytic combustion decomposition is too low, the control system can control the internal heat exchanger 52 to be powered on for auxiliary heating to preheat the organic waste gas together with the heat generated by the catalytic combustion decomposition, so as to achieve the effect of stable heating, realize real-time monitoring, and ensure the automation, intelligence, and efficient operation of the equipment.

[0059] like Figure 5-6 As shown, in this embodiment, the catalyst chamber 5 also includes: a honeycomb ceramic insulation layer 54, which is arranged in the catalyst chamber 5 and between the heater 53 and the catalyst chamber 55, and is used to absorb the excess heat of the organic waste gas after being heated by the internal heat exchanger 52 or the heater 53, so as to store and release heat. Among them, the honeycomb ceramic insulation layer 54 can absorb the heat in the organic waste gas between the heater 53 and the catalyst chamber 55 to store and release heat for the heated or compensated heated organic waste gas, so that the organic waste gas after compensation heating can reach the reaction temperature when the heater 53 does not need to compensate heating, so that the reaction waste gas flows to the catalyst chamber for catalytic combustion reaction, and realizes the heat recovery characteristics of circular energy saving and environmental protection.

[0060] Furthermore, if Figure 8As shown, the honeycomb ceramic insulation layer 54 is provided with a plurality of honeycomb holes 541 arranged in a mesh shape and having the same aperture, and the honeycomb holes 541 are laterally connected to the heater, and when the reaction exhaust gas flows laterally and contacts the inner wall of the honeycomb holes 541, it is heated by the inner wall or absorbs heat to release heat and store heat. Therefore, the honeycomb ceramic insulation layer 54 utilizes various shapes composed of countless equal holes of honeycomb ceramics, among which the maximum number of holes can reach 120-140 per square centimeter, the density is 0.3-0.6 grams per cubic centimeter, and the water absorption rate is as high as more than 20%; multiple honeycomb holes are axially abutted and have the same pore size to form a porous thin-walled honeycomb ceramic shape, which greatly increases the geometric surface area of ​​the carrier and improves the thermal shock resistance; further, the honeycomb holes 541 can be set to be triangular and / or square main mesh holes as a catalytic carrier, so that the thermal shock resistance trend and thermal shock damage temperature of the honeycomb ceramic insulation layer 54 can be increased at the same time as the number of holes per unit area increases and the thickness of the carrier pore wall decreases, and the reaction exhaust gas can be further stored and released. Heat can be saved by reducing heat loss to save electricity and effectively reduce the amount of heating by the heater. Therefore, the honeycomb ceramic insulation layer 54 is used to receive the excess heat of the organic waste gas after heating by the internal heat exchanger 52 or the heater 53 to store and release heat, wherein the honeycomb ceramic insulation layer 54 can absorb the heat in the organic waste gas between the heater and the catalytic chamber to store and release heat to the heated or compensated heated organic waste gas, so that the organic waste gas after compensation heating can reach the reaction temperature without the need for compensation heating by the heater 53, and the organic waste gas that reaches the reaction temperature can flow to the catalytic chamber 55 for catalytic combustion reaction, thereby realizing the heat recovery characteristics of circular energy saving and environmental protection.

[0061] like Figure 5-6 As shown, in this embodiment, the internal heat exchanger 52 is tilted and abutted against the catalyst chamber 5 and divides the catalyst chamber 5 into an air inlet chamber 513, a heating chamber 514, a decomposition chamber 515 and an air outlet chamber 516 in sequence, wherein the internal heat exchanger 52 is provided with an exhaust gas inlet 521 connected to the side air inlet 511, an exhaust gas outlet 522, a harmless hot gas inlet 523 and a harmless hot gas outlet 524, the air inlet chamber 513 is connected between the side air inlet 511 and the exhaust gas inlet 521, the heating chamber 514 is connected between the exhaust gas outlet 522 and the exhaust gas circulation chamber 517, and the heating chamber 514 is provided with a heater 53 connected to the exhaust gas outlet 522 and a honeycomb ceramic insulation layer located on one side of the heater 53, the decomposition chamber 515 is provided with a catalytic chamber 55 located between the honeycomb ceramic insulation layer and the harmless hot gas inlet 523, and the air outlet chamber 516 is connected between the harmless hot gas outlet 524 and the side air inlet 511.

[0062] like Figure 5-6As shown, in the present embodiment, the catalyst chamber 5 also includes: an exhaust gas circulation chamber 517, the exhaust gas circulation chamber 517 is connected between the heating chamber 514 and the decomposition chamber 515, the exhaust gas circulation chamber 517 is connected between the honeycomb ceramic insulation layer and the catalyst chamber 55 for the reaction exhaust gas to flow, and a pressure relief explosion-proof component 56 connected to the control system is provided in the exhaust gas circulation chamber 517. Specifically: one side of the catalyst chamber 55 is connected to the internal heat exchanger 52, and the exhaust gas circulation chamber 517 is provided between the other side of the catalyst chamber 55 and the honeycomb ceramic insulation layer 54. The exhaust gas circulation chamber 517 is used for mixed flow of the reaction exhaust gas, so that the heated organic waste gas can be fully heated in the chamber to accelerate the combustion reaction rate. In the present embodiment, the pressure relief explosion-proof component 56 is installed on the catalyst chamber 5 to connect the outside and the exhaust gas circulation chamber 517. Specifically, as Figure 5 , 6 As shown, the pressure relief explosion-proof component is installed on the side of the catalyst chamber 5. When the temperature of the catalyst chamber 55 is too high, the cold air supplement valve is opened to supplement fresh air into the exhaust gas circulation chamber 517. By reducing the temperature of the organic waste gas in the exhaust gas circulation chamber 517, the temperature of the catalyst chamber 55 can be effectively controlled to prevent the temperature of the catalyst chamber 55 from being too high, affecting the catalytic combustion reaction, causing excessive pressure in the catalyst chamber, and avoiding safety accidents. Among them, the pressure relief explosion-proof component 56 can be set as a cold air supplement valve or a safety pressure relief valve.

[0063] In this embodiment, the exhaust gas inlet 521 and the harmless hot gas outlet are separated from each other below the catalyst chamber 5, and the harmless hot gas outlet 524 and the exhaust gas outlet 522 are separated from each other above the catalyst chamber 5, so that the exhaust gas inlet 521, the exhaust gas outlet 522, the harmless hot gas inlet 523, and the harmless hot gas outlet 524 are all tilted in the catalyst chamber 5, so as to better coordinate the circulation effect of better intake of organic waste gas and better exhaust of harmless hot gas, accelerate the combustion reaction rate of organic waste gas, and achieve the recycling effect of heat storage and heat release.

[0064] like Figure 5 , 6 As shown, the exhaust gas inlet 521 is arranged at the lower left side of the internal heat exchanger 52 and is connected to the side air inlet 511, so that the organic exhaust gas can flow into the internal heat exchanger 52 through the air inlet cavity 513. As a result, the organic exhaust gas can enter the air inlet cavity 513 of the catalytic chamber 5 from the side air inlet 511 below the catalytic chamber 5, and enter the internal heat exchanger 52 along the exhaust gas inlet 521 below one side of the internal heat exchanger 52 in the air inlet cavity 513 for heating; thus, the organic exhaust gas can be preheated in a better flow direction, reducing the reactive loss of heat in the organic exhaust gas and improving the heat utilization rate;

[0065] like Figure 5As shown, the exhaust gas outlet 522 is arranged on the upper right side of the internal heat exchanger 52 and connected to the heater 53, which is used to discharge the preheated organic exhaust gas after the heat is released by the internal heat exchanger 52 into the heating chamber 514 for heating or heat storage to the combustion reaction temperature; thus, the organic exhaust gas is heated in the internal heat exchanger 52 and discharged from the exhaust gas outlet 34 into the heating chamber 514 provided with the heater 53, and the heater 53 is arranged on the upper side of the internal heat exchanger and connected to the exhaust gas outlet 34, which can directly heat the heated organic exhaust gas to the combustion reaction temperature without reaching the combustion reaction temperature, and the heating rate is fast. At the same time, unnecessary heat consumption is avoided when the heated organic exhaust gas circulates in the long flow channel, thereby improving the heat utilization rate and accelerating the combustion reaction rate.

[0066] like Figure 5 As shown, the harmless hot gas inlet 523 is arranged at the lower right side of the inner heat exchanger 52, and the harmless hot gas inlet 523 is located below the exhaust gas outlet 522 and docked with the catalytic chamber 55, for receiving the harmless hot gas generated by the catalytic combustion reaction in the catalytic chamber 55; since the catalytic chamber 55 is arranged below the heater 53 and the honeycomb ceramic insulation layer 54, an exhaust gas circulation cavity 517 is provided between the honeycomb ceramic insulation layer 54 and the catalytic chamber 55, therefore, the organic exhaust gas is heated by the heater 53 and the honeycomb ceramic insulation layer 54 to form a reaction exhaust gas, and the reaction exhaust gas can flow from the upper inner part of the catalytic chamber 55 along the heating cavity 514 to the exhaust gas circulation cavity 517. 17, in the waste gas circulation chamber 517, the organic waste gas can flow from top to bottom to the catalytic chamber 55 of the decomposition chamber 515, so as to be able to undergo a combustion catalytic reaction with the catalyst contained in the catalytic chamber 55, thereby burning and decomposing the organic waste gas into harmless hot gas and generating a large amount of heat. As a result, the harmless hot gas (the two are mixed into harmless hot gas) in the decomposition chamber 515 directly enters the inner heat exchanger 52 through the harmless hot gas inlet 523 at the lower right side of the inner heat exchanger 52. The decomposition chamber 515 provides sufficient space for the flow of harmless hot gas, so that the inner heat exchanger 52 absorbs part of the heat and discharges the remaining harmless hot gas through the harmless hot gas outlet 524.

[0067] like Figure 5As shown, the harmless hot gas outlet 524 is arranged on the upper left side of the inner heat exchanger 52 and is connected to the upper exhaust port 512 through the air outlet cavity 516. The harmless hot gas outlet 524 is located above the exhaust gas inlet 521. Therefore, when the inner heat exchanger 52 absorbs part of the heat and discharges the remaining harmless hot gas from the harmless hot gas outlet 524 through the air outlet cavity 516, the harmless hot gas carrying a large amount of heat can be more easily discharged from the upper outlet of the inner heat exchanger 52, and the air outlet cavity 516 prevents the heat from flowing out of the catalyst chamber 5 quickly, thereby improving the preheating degree of the organic waste gas by the inner heat exchanger 52. In this embodiment, the upper exhaust port 512 of the catalyst chamber 5 is opened on the top surface of the catalyst chamber 5, so that the harmless hot gas outlet 524 can be quickly connected with the upper exhaust port 512, so that the harmless hot gas and part of the heat after the combustion reaction can be quickly discharged for reuse in the paint dipping furnace, thereby improving the heat utilization rate and accelerating the combustion reaction rate.

[0068] like Figure 5 , 6 As shown, in the present embodiment, the internal heat exchanger 52 is tilted and abutted between the top and bottom surfaces of the catalyst chamber 5, wherein a support plate 57 is provided between one side surface of the internal heat exchanger 52 and one side surface of the catalyst chamber 5, the support plate 57 is used to support the heater 53 and the honeycomb ceramic thermal insulation layer 54, and to isolate the heater 53 from the catalyst chamber 55, a heater 53 and a honeycomb ceramic thermal insulation layer are provided between the upper part of the support plate 57 and the top surface of the catalyst chamber 5, and a catalyst chamber 55 is provided between the lower part of the support plate 57 and the bottom surface of the catalyst chamber 5; a partition plate 58 is provided between the other side of the internal heat exchanger 52 and the side wall of the catalyst chamber 5, the partition plate 58 is used to isolate the partition plate 58 of the side air inlet 511 and the upper exhaust port 512. Therefore, the internal heat exchanger 52 isolates the exhaust gas inlet 521 and the harmless hot gas outlet 524 through the partition plate 58, and the internal heat exchanger 52 isolates the exhaust gas outlet 522 and the harmless hot gas inlet 523 through the support plate 57, so that four isolation chambers connected through the internal heat exchanger 52 are formed in the catalyst chamber 5 to ensure the stability of the heat exchange operation.

[0069] like Figure 5 As shown, in other embodiments, a pneumatic valve 59 connecting the side air inlet 511 and the upper exhaust port 512 is provided on the partition 58. Therefore, when the catalytic combustion reaction is not required, the operation of the internal heat exchanger 52, the heater 53 and the catalytic chamber 55 can be closed, and the pneumatic valve 59 is opened to directly connect the side air inlet 511 and the upper exhaust port 512 to ensure that the paint dipping furnace installed with the organic waste gas treatment equipment can be normally exhausted when heat recovery is not required.

[0070] like Figure 7As shown, in this embodiment, the external heat exchanger 7 is provided with an oxygen-free tail gas inlet 71 for connecting the centrifugal fan 6, a harmless tail gas outlet 72 for connecting between the oxygen-free tail gas inlet 71 and the exhaust pipe 8, an external heat exchanger inlet 73 for connecting to the outside, and a hot air outlet 74 for connecting the external heat exchanger inlet 73 and the waste heat return pipe 2. Thus, the external heat exchanger 7 receives the oxygen-containing hot air discharged from the centrifugal fan 6 through the oxygen-free tail gas inlet 71, and the external heat exchanger 7 absorbs some heat of the oxygen-containing hot air to heat the external air drawn in through the external heat exchanger inlet 73 to form oxygen-containing hot air, so that the oxygen-containing hot air flows through the hot air outlet 74 to the waste heat return pipe 2 to be transported to the immersion paint furnace for use; and other heat in the oxygen-containing hot air and the harmless hot air are discharged to the outside through the hot air outlet 72, and the other heat discharged can be used for other heat recovery.

[0071] like Figure 1-4 As shown, in this embodiment, the organic waste gas treatment device also includes: a dust removal flame arrester 4, which is connected to the organic waste gas inlet end of the catalyst chamber 5, so as to be arranged between the filter 3 and the catalyst chamber 5, and is used to prevent the combustion wind in the catalyst chamber 5 from flowing back into the workshop along the pipeline. Among them, the filter 3 is connected to the organic waste gas inlet pipeline 1 through the switch valve 9, and an emptying valve 10 connected to the organic waste gas inlet pipeline 1 is provided between the filter 3 and the dust removal flame arrester 4. The emptying valve 10 can cooperate with the centrifugal fan 6 to further realize the purification function before the operation of the organic waste gas treatment device and prevent accidental explosion. Through the air intake and exhaust functions of the emptying valve 10 and the centrifugal fan 6, the pipeline (air duct), the catalyst chamber, etc. are purged clean with air to prevent accidental explosion during catalytic combustion.

[0072] like Figure 4 As shown, in this embodiment, an air volume regulating valve 11 connected to the control system is provided between the catalyst chamber 5 and the centrifugal fan 6. The air volume regulating valve 11 is used to control the speed at which the harmless hot air discharged from the catalyst chamber 5 flows to the centrifugal fan 6, and controls the wind pressure in the pipeline to be under a negative pressure including -0.1 kPa, so as to achieve stable heat energy recovery operation.

[0073] like Figure 5 As shown, in this embodiment, the temperature of the organic waste gas output from the organic waste gas inlet pipe is 30℃-40℃, and the organic waste gas at 30℃-40℃ is catalytically burned in the catalyst chamber 5 to become harmless hot gas at 450℃-500℃. The harmless hot gas at 450℃-500℃ passes through the catalyst chamber 5 and a part of the heat is used to preheat the organic waste gas, and the heat exchange is used to discharge the oxygen-free exhaust gas at 220℃-300℃. The oxygen-free exhaust gas at 220℃-300℃ is made into oxygen-containing hot air at 120℃-150℃ through the external heat exchanger 7 and sent back to the paint dipping furnace for reuse.

[0074] As shown below, this is the organic waste gas emission detection table before and after the organic waste gas is treated by this organic waste gas treatment device:

[0075]

[0076] Therefore, it can be seen from the above table that in the varnishing process of the motor manufacturing industry, the concentration of organic waste gas discharged by the varnishing furnace is as high as 1500mg / m 3 , the benchmark flow rate of air volume is 8000-12000m 3 / h, thus, the organic waste gas has the characteristics of high organic waste gas concentration, small air volume and high calorific value. In view of the characteristics of this organic waste gas, the present invention now adopts a combined treatment process of "direct catalytic combustion + heat recovery", and the discharged organic waste gas is filtered and then catalytically burned to form harmless hot gas with heat from the organic waste gas. After the organic waste gas discharged from the paint immersion furnace is treated by the organic waste gas treatment device, the concentration of the organic waste gas discharged from the paint immersion furnace is reduced by at least 94%, which not only makes the organic waste gas meet the emission standards, but also can recover the heat in the harmless hot gas to be used in the paint immersion furnace, effectively saving the electric energy used for heating the paint immersion furnace.

[0077] like Figure 1-7 As shown, in this embodiment, the operation process of the organic waste gas treatment device is:

[0078] a. Before the operation of the catalyst chamber 5, start the centrifugal fan 6 and the exhaust valve 10, and close the switch valve 9. Through the air intake and exhaust functions of the exhaust valve 10 and the centrifugal fan 6, use air to clean the pipeline (air duct), catalyst chamber, etc. to prevent accidental explosion during catalytic combustion;

[0079] b. During normal operation, the drain valve 10 is closed, the switch valve 9 is opened, and the organic waste gas is deeply treated through the coordination of the organic waste gas intake pipe 1, the waste heat return pipe 2, the filter 3, the dust removal flame arrester 4, the catalyst chamber 5, the centrifugal fan 6, the external heat exchanger 7, and the exhaust pipe 8;

[0080] c. When the concentration of the organic waste gas treated by the catalyst chamber 5 reaches 1 / 4 of the lower explosion limit, the concentration detector immediately alarms, the heater and internal heat exchanger of the catalyst chamber 5 are automatically closed, and the drain valve 10 is automatically opened to quickly reduce the concentration of the organic waste gas entering the catalyst chamber to avoid accidents. After the concentration of the organic waste gas in the catalyst chamber 5 is lower than 1 / 4 of the lower explosion limit, the drain valve 10 is closed to restore the normal operation of the entire device.

[0081] Catalytic combustion is essentially a gas-solid phase reaction, which allows active oxygen to participate in deep oxidation. In the process of catalytic combustion, the role of the catalyst is to reduce the activation energy. At the same time, the catalyst surface has an adsorption effect, which enriches the reactant molecules on the surface, increases the reaction rate, and accelerates the reaction. With the help of a catalyst, organic waste gas can be flamelessly burned at a lower ignition temperature, and oxidized and decomposed into carbon dioxide and water, while releasing a large amount of heat energy, with high efficiency and no secondary pollution.

[0082] In the present invention, the catalytic combustion principle of the catalytic chamber 5 is described as follows: the organic waste gas is converted into harmless water and carbon dioxide gas at a relatively low temperature by using the catalyst as an intermediate, that is:

[0083]

[0084] Therefore, after the organic waste gas passes through the dry filter 3 to remove particulate matter in the organic waste gas, it first passes through the dust removal and fire prevention device 4 for dust removal and fire prevention, and then enters the internal heat exchanger 52 for heating, and then is sent to the heating chamber to be heated by the heater 53, so that the organic waste gas reaches the combustion reaction temperature, and then through the action of the catalytic chamber 55, the organic waste gas is decomposed into carbon dioxide, water and a large amount of heat. The heat then enters the internal heat exchanger 52 to exchange heat with the organic waste gas that enters the internal heat exchanger 52 once, so that the temperature of the entering organic waste gas is increased to reach the combustion reaction temperature. If the reaction temperature cannot be reached, the heater 53 can realize compensatory heating through the automatic control system to make it completely burn, thereby saving energy, and the effective removal rate of organic waste gas meets the emission standards, which meets the national emission standards.

[0085] Among them, in this embodiment, the organic waste gas output by the paint dipping furnace is generally maintained at a temperature between 30°C and 40°C. When the organic waste gas is transported to the internal heat exchanger 52 through the organic waste gas inlet pipe 1 and the filter 3, after the internal heat exchanger 52 is turned on to heat the organic waste gas, the temperature of the organic waste gas can reach 250°C-300°C. At this time, after the organic waste gas directly reaches the combustion reaction temperature after being heated by the internal heat exchanger 52, the heater 53 does not need to compensate for the heating of the organic waste gas, and the organic waste gas can directly pass through the heater 53 and the honeycomb ceramic insulation layer 54 to reach the catalytic chamber 55. After the organic waste gas is heated by the internal heat exchanger 52, when the temperature of the organic waste gas is higher than the combustion reaction temperature, or when there is a temperature difference between the temperature of the organic waste gas after compensation heating by the heater 53 and the combustion reaction temperature, the honeycomb ceramic insulation layer 54 can store a part of the heat in the heating chamber, and release the stored heat to heat the organic waste gas in the heating chamber that does not reach the combustion reaction temperature, thereby achieving the purpose of heat storage and heat release, and achieving the environmentally friendly setting of reducing the output power of the heater 53; thus, the oxygen-free exhaust gas after heat exchange through the catalyst chamber 5 is about 220°C, and the 220°C oxygen-free exhaust gas is made into 120°C hot air through the external heat exchanger 7.

[0086] Furthermore, the organic waste gas treatment device is equipped with an interlocking function through the control system. When the device is in automatic operation, it can only be put into operation when the operating conditions are met, which can avoid abnormal operation caused by human errors and equipment failures during operation. When the system is in the automatic operation process, no matter when the operator issues a shutdown command, the system will choose the appropriate time to execute the shutdown procedure and exit the operation reasonably and reliably according to the process requirements. The organic waste gas treatment device has the following functions:

[0087] 1. Use precious metals palladium and platinum plated on the carrier as catalysts, with a purification efficiency of more than 95%. The catalyst has a long service life and can be regenerated, with smooth airflow and low resistance.

[0088] 2. Complete safety facilities: dust removal and flame arrester are equipped to reduce the hidden dangers of dangerous combustion of equipment, pressure relief and explosion-proof parts can effectively protect the safe operation of equipment, and temperature measuring parts can provide over-temperature alarm and other protective facilities.

[0089] 3. Power consumption: When starting to work, it is only necessary to preheat the heat exchanger for 15 to 30 minutes at full power. During normal operation, it only consumes the power of the centrifugal fan. When the concentration of organic waste gas is low, the heater and heat exchanger are automatically intermittently compensated for heating.

[0090] 4. Intelligent and fully automatic heat exchange: The system is equipped with an intelligent and fully automatic catalytic chamber. The system temperature control of the catalytic chamber is fully automatically controlled by the PLC program to ensure that the outlet gas temperature meets the technical design requirements.

[0091] Based on the above-mentioned organic waste gas treatment device, this embodiment discloses a method for treating organic waste gas from a paint dipping furnace, comprising the following steps:

[0092] Filtration: The organic waste gas outputted from the lacquer dipping furnace is transported to the filter 3 through the organic waste gas inlet pipe 1 to remove particulate matter in the organic waste gas, wherein the organic waste gas passing through the filter 3 is at a temperature between 30°C and 40°C;

[0093] Anti-backfire: The organic waste gas with particulate matter filtered out is transported to the catalyst chamber 5 through the dust removal flame arrester 4 to prevent the combustion wind in the catalyst chamber 5 from flowing back to the workshop through the organic waste gas intake pipe 1;

[0094] Preheating: The inner heat exchanger 52 tilted in the catalyst chamber 5 is connected to the dust removal flame arrester 4 through a pipeline, and the inner heat exchanger 52 receives the organic waste gas with particulate matter filtered out, and preheats the organic waste gas at 30°C-40°C to form a reaction waste gas at 250°C-300°C;

[0095] Compensation heating: A heater 53 is connected to the upper side of the inner heat exchanger 52, and the heater performs compensation heating on the organic waste gas below 300°C to form a reaction waste gas with a reaction temperature of 300°C-350°C, so that the reaction waste gas can undergo a catalytic combustion reaction under the combustion reaction temperature condition of 300°C-350°C;

[0096] Heat storage and heat release: one side of the heater 53 is connected to the honeycomb ceramic insulation layer 54, so that the heated organic waste gas can be stored and released through the honeycomb ceramic insulation layer 54 to maintain the reaction temperature at 300°C-350°C. One side of the honeycomb ceramic insulation layer 54 is provided with a waste gas flow chamber 517 for fully mixing and flowing the reaction waste gas. The waste gas flow chamber 517 outputs the reaction waste gas. At this time, the heating output of the heater 53 can be reduced through the honeycomb ceramic insulation layer 54, thereby achieving the purpose of energy saving and environmental protection;

[0097] Catalytic combustion: a catalytic chamber 55 is arranged below the honeycomb ceramic insulation layer 54 and the heater 53. One side of the catalytic chamber 55 is connected to the honeycomb ceramic insulation layer 54 through the exhaust gas flow cavity 517. The catalytic chamber 55 receives the exhaust gas reaching the reaction temperature of 300°C-350°C and performs a catalytic combustion reaction with the catalyst built in the catalytic chamber 55 to generate harmless hot gas. The temperature of the harmless hot gas is about 450°C-500°C.

[0098] Primary heat exchange: the catalytic chamber is connected to the lower side of the internal heat exchanger 52, the internal heat exchanger 52 receives the harmless hot air of 450°C-500°C discharged from the catalytic chamber, and receives a part of the heat of the harmless hot air to preheat the particle-free organic waste gas in step S3, and at the same time reduces the harmless hot air of 450°C-500°C to form harmless tail gas of 220°C-300°C to be discharged from the catalytic chamber;

[0099] Transport: connect the catalyst chamber 5 with the centrifugal fan 6, and the centrifugal fan 6 transports the harmless exhaust gas at 220°C-300°C to the external heat exchanger 7;

[0100] Secondary heat exchange, heat recovery: A blower 12 is provided between the external heat exchanger 7 and the waste heat return pipe 2. The external heat exchanger 7 absorbs part of the heat of the 220°C-300°C oxygen-free tail gas to produce 120°C-150°C oxygen-containing hot air from the external air, which is then transported back to the furnace through the waste heat return pipe 2 for recycling under the power of the blower 12.

[0101] Exhaust: connect the external heat exchanger 7 with the exhaust pipe 8, and the exhaust pipe 8 is connected to the outside. The external heat exchanger 7 converts the catalytic exhaust gas after absorbing heat into qualified exhaust gas and discharges it to the outside through the exhaust pipe 8.

[0102] Thus, the temperature of the transported organic waste gas is 30℃-40℃ organic waste gas, and the 30℃-40℃ organic waste gas is heat-exchanged into 250℃-300℃ preheated waste gas through the internal heat exchanger 52, and the 250℃-300℃ preheated waste gas is heated by the heater 53 to become a reaction waste gas with a catalytic temperature of 300℃~350℃, and the 300℃~350℃ reaction waste gas is catalytically burned in the catalytic bin to become 450℃-500℃ harmless hot gas, and the 450℃-500℃ harmless hot gas is heat-exchanged into 220℃-300℃ harmless tail gas through the internal heat exchanger 52, and the external heat exchanger 7 uses the heat of the 220℃-300℃ harmless tail gas to convert the oxygen-containing hot air into 120℃-150℃ oxygen-containing hot air and send it back to the paint dipping furnace for reuse.

[0103] In this embodiment, the catalyst chamber 5 uses a catalyst and electric heating to generate heat energy. When the catalyst chamber 5 reaches the set temperature, the mixed organic waste gas passes through the catalyst chamber 55 to undergo a catalytic decomposition reaction to generate heat energy. When the temperature of the catalyst chamber 5 exceeds the set temperature, the system stops heating, so that the power consumption of the catalyst chamber 5 is very low. If the mixed organic waste gas reaches a certain temperature, the system is in a power-free operation state. The high-temperature oxygen-free tail gas after heat exchange is about 220°C, and the external heat exchanger 7 is used to make 120°C oxygen-containing hot air, which is sent to the paint dipping furnace for use. By doing a good job of pipeline insulation and mutual control and adjustment, the electric energy used for heating the paint dipping furnace can be saved.

[0104] In summary, the present invention is based on the above-mentioned disclosed technical features and aims to protect an organic waste gas treatment device. The organic waste gas in the paint dipping process of the motor manufacturing industry has the following characteristics: high organic waste gas concentration, small air volume, and high calorific value. The combined treatment process of "direct catalytic combustion + heat recovery" is adopted, which not only makes the organic waste gas meet the emission standards, but also recovers the heat after catalytic combustion to the paint dipping furnace for use, which can save the electricity used for heating the paint dipping furnace.

[0105] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. An organic waste gas treatment device, characterized in that: include: An organic waste gas inlet pipe connected to the waste gas outlet of the varnish dipping furnace and a waste heat return pipe connected to the hot air inlet of the varnish dipping furnace are connected. A filter, a catalytic chamber, a centrifugal fan, and an external heat exchanger for connecting to a control system are sequentially connected between the organic waste gas inlet pipe and the waste heat return pipe along the gas flow direction; The filter is used to filter particulate matter in the organic waste gas transported by the organic waste gas intake pipeline to output particulate-free organic waste gas; The catalyst chamber receives the particle-free organic waste gas and heats it to the reaction temperature to perform a catalytic combustion reaction to generate harmless hot gas, absorbs part of the heat in the harmless hot gas to heat the particle-free organic waste gas, and then cools the harmless hot gas to be discharged as catalytic tail gas; After the centrifugal fan transports the catalytic tail gas to the external heat exchanger, the external heat exchanger absorbs the heat in the catalytic tail gas and heats the extracted external air to form oxygen-containing hot air, which is then transported back to the furnace through the waste heat return pipeline. At the same time, the catalytic tail gas after the heat is absorbed is discharged as qualified tail gas; The catalytic chamber is provided with: an internal heat exchanger, which is connected to the downstream of the filter, and heats the particle-free organic waste gas flowing into the internal heat exchanger by absorbing heat to form preheated waste gas before being discharged; a heater, which is connected to one side of the internal heat exchanger, receives the instruction of the control system to perform compensatory heating on the preheated waste gas, and then powers on to heat and control the temperature of the preheated waste gas passing through the heater to output reaction waste gas reaching the catalytic combustion reaction temperature; a catalytic chamber, which is arranged below the heater and connected to the internal heat exchanger, receives the reaction waste gas to perform catalytic combustion reaction to generate harmless hot gas with combustion heat, and the harmless hot gas absorbs part of the heat when flowing through the internal heat exchanger to form catalytic tail gas and discharge it from the catalytic chamber; The catalytic chamber further comprises: a honeycomb ceramic insulation layer, which is butted against a side of the heater outputting the reaction exhaust gas and is arranged above the catalytic chamber, and a plurality of honeycomb holes abutting in an axial direction are opened on the honeycomb ceramic insulation layer, and the honeycomb holes are laterally butted against the heater, and when the reaction exhaust gas laterally flows and contacts the inner wall of the honeycomb hole, the inner wall is heated or absorbs heat to release heat and store heat; An exhaust gas circulation cavity is provided between the honeycomb ceramic insulation layer and the catalytic chamber for mixed circulation of reaction exhaust gas. A pressure relief explosion-proof component connected to the control system is provided in the exhaust gas circulation cavity. The pressure relief explosion-proof component is installed on the side of the catalytic chamber and connected to the outside to detect the exhaust gas pressure in the exhaust gas circulation cavity for exhaust pressure relief. The first temperature measuring component, the second temperature measuring component and the third temperature measuring component of the control system are respectively connected. A first temperature measuring element is provided between the internal heat exchanger and the heater, and is used to measure the current temperature of the preheated exhaust gas flowing to the heater and form first temperature measurement information to be sent to the control system, and the control system controls the electric heating time and heating temperature of the heater to control the temperature of the preheated exhaust gas according to the first temperature measurement information; A second temperature measuring element is arranged between the heater and the catalytic chamber, and is used to measure the current temperature of the reaction exhaust gas flowing to the catalytic chamber and form second temperature measurement information to be sent to the control system. The control system controls the electric heating time and heating temperature of the heater to control the temperature of the preheated exhaust gas according to the second temperature measurement information; A third temperature measuring element is provided between the catalytic bin and the internal heat exchanger, and is used to measure the current temperature of the harmless hot air flowing to the internal heat exchanger and form third temperature measurement information to be sent to the control system, and the control system controls the power-on time and heating temperature of the internal heat exchanger for heating the preheated exhaust gas according to the third temperature measurement information; When the control system detects through the second temperature measuring component that the temperature of the reaction waste gas in the waste gas circulation chamber is too high, it can be detected that the temperature of the catalytic chamber is too high. At this time, the control system controls the opening of the pressure relief explosion-proof component to add air to the waste gas circulation chamber to reduce the temperature of the organic waste gas, thereby preventing the temperature of the catalytic chamber from being too high. The organic waste gas inlet pipeline outputs organic waste gas at 30℃-40℃, which is heated by the internal heat exchanger to become preheated waste gas at 250℃-300℃, and the preheated waste gas at 250℃-300℃ is temperature-controlled by the heater to form reaction waste gas at 300℃-350℃, and the reaction waste gas at 300℃-350℃ is catalytically burned and decomposed into harmless hot gas at 450℃-500℃ by the catalytic bin, and the harmless hot gas at 450℃-500℃ is partially absorbed by the internal heat exchanger to form oxygen-free tail gas at 220℃-300℃, which is transported to the external heat exchanger through the centrifugal fan, and the external heat exchanger absorbs part of the heat of the oxygen-free tail gas at 220℃-300℃ to make the external air into oxygen-containing hot air at 120℃-150℃ for transport back to the furnace, and then the catalytic tail gas after the heat absorption is formed into standard tail gas at 80℃-130℃ and discharged externally.

2. The organic waste gas treatment device according to claim 1, characterized in that: The internal heat exchanger is tilted and abutted in the catalytic chamber, and a heat insulation board is connected to one side of the internal heat exchanger. The heater is installed between the heat insulation board and the top surface of the catalytic chamber. The catalytic chamber is abutted between the heat insulation board and the bottom surface of the catalytic chamber. Both sides of the catalytic chamber are connected to the internal heat exchanger and the heater respectively. The catalyst chamber is provided with a side air inlet and an upper exhaust port, and the internal heat exchanger is provided with an exhaust gas inlet connected to the side air inlet for receiving particle-free organic exhaust gas, an exhaust gas outlet connected to the exhaust gas inlet and connected to the heater for outputting preheated exhaust gas, a harmless hot gas inlet connected to the catalyst chamber for receiving harmless hot gas, and a harmless hot gas outlet connected to the harmless hot gas inlet and the upper exhaust port for outputting catalytic tail gas.

3. The organic waste gas treatment device according to claim 1, characterized in that: The external heat exchanger is provided with an oxygen-free exhaust gas inlet for connecting to the centrifugal fan, a harmless exhaust gas outlet for connecting between the oxygen-free exhaust gas inlet and the exhaust pipe, an external heat exchanger inlet for connecting to the outside, and a hot air outlet for connecting between the external heat exchanger inlet and the blower; The harmless gas enters the external heat exchanger through the oxygen-free exhaust gas inlet for heat exchange and cooling to form qualified exhaust gas, which is then discharged to the outside through the harmless exhaust gas outlet and the exhaust pipe. The external heat exchanger inlet serves as the cold air inlet to allow external air to enter the external heat exchanger for heat exchange and heating to form oxygen-containing hot air, which is then transported back to the furnace through the waste heat return pipe through the hot air outlet under the power of the blower.

4. The organic waste gas treatment device according to claim 1, characterized in that: include: The dust removal flame arrester is connected between the filter and the catalyst chamber through a pipeline and is connected to a control system, and connects or cuts off the connecting pipeline between the catalyst chamber and the filter by detecting the gas flow direction in the pipeline; The dust removal flame arrester and the filter are provided with drain valves, the filter and the organic waste gas intake pipe are connected with a switch valve, and the switch valve and the drain valve are respectively connected to the control system.

5. The organic waste gas treatment device according to claim 1, characterized in that: The air volume regulating valve is connected between the catalyst chamber and the centrifugal fan through a pipeline and is connected to the control system. It is used to detect the wind pressure change of the harmless hot air in the pipeline and generate wind pressure information to send to the control system. The control system controls the air volume regulating valve to adjust the cross-sectional area of ​​the connecting pipeline according to the wind pressure information, so that the harmless hot air maintains a stable air volume within the wind pressure range of 50-200Pa and flows to the external heat exchanger.

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