CN112082168A

CN112082168A - Organic waste gas treatment device

Info

Publication number: CN112082168A
Application number: CN202011076190.7A
Authority: CN
Inventors: 夏良媛; 董龙标; 赵慧
Original assignee: Zhongshan Zhiming Energy Saving And Environmental Protection Technology Co ltd
Current assignee: Zhongshan Zhiming Energy Saving And Environmental Protection Technology Co ltd
Priority date: 2020-10-10
Filing date: 2020-10-10
Publication date: 2020-12-15

Abstract

The application discloses organic waste gas administers device includes: the system comprises an organic waste gas inlet pipeline communicated with a waste gas outlet of the paint dipping furnace and a waste heat return pipeline communicated with a hot air inlet of the paint dipping furnace, wherein a filter, a catalytic chamber, a centrifugal fan and an external heat exchanger which are respectively connected with a control system are sequentially communicated between the organic waste gas inlet pipeline and the waste heat return pipeline along the gas flowing direction; the catalytic chamber receives the particle-free organic waste gas filtered by the filter, heats the particle-free organic waste gas to a reaction temperature, carries out catalytic combustion reaction to generate harmless hot gas, absorbs a part of heat in the harmless hot gas to heat the particle-free organic waste gas, and then cools the harmless hot gas to form catalytic tail gas to be discharged; the outer heat exchanger absorbs heat in the catalytic tail gas, the extracted outside air is heated by controlling temperature to form oxygen-containing hot air which is conveyed back to the furnace, and meanwhile, the catalytic tail gas after absorbing the heat forms standard tail gas to be discharged outside. Therefore, the invention recovers the heat in the organic waste gas to the paint dipping furnace for use and enables the organic waste gas to reach the emission standard.

Description

Organic waste gas treatment device

Technical Field

The invention relates to the technical field of organic waste gas treatment, in particular to an organic waste gas treatment device.

Background

Processing production motor uses the sand steel sheet to carry out rotor, stator lamination according to different product requirements, gets into the die casting machine behind the rotor lamination, and the supporting smelting pot of die casting machine pours into the die casting machine into for the good rotor banding of lamination after melting aluminium, and the rotor semi-manufactured goods carries out the pressure axis after the banding, processes the back people's frock bearing through dynamic balance inspection, becomes the rotor finished product. After winding, the electromagnetic wire and the processed insulating material are embedded into the laminated stator semi-finished product, the stator semi-finished product enters a paint dipping production line for paint removal after a series of binding, shaping and wiring, and the stator finished product is formed after drying and detection. The project uses the cold plate, the motor shell is manufactured through a punching or winding drum production line according to the shell requirements of different motor products, and finally the rotor, the stator and the shell are assembled into a finished product through a self-contained production line.

VOCs can be generated in the paint dipping process of the production motor, and insulating paint and Tianna water are needed in the paint dipping process. This process can volatilize large amounts of VOCs. At present, the industry adopts a treatment process of 'spray tower + activated carbon adsorption' aiming at organic waste gas generated in a paint dipping procedure, the removal efficiency of the process is low, and the organic waste gas can not be stably discharged up to the standard.

Disclosure of Invention

Objects of the invention

The invention aims to provide an organic waste gas treatment device, which enables organic waste gas to reach the standard to be discharged by a combined treatment mode of a direct catalytic combustion method and heat recovery, recovers heat after catalytic combustion to be used in a paint dipping furnace, and can save electric energy used for heating the paint dipping furnace.

(II) technical scheme

In order to achieve the purpose, the invention adopts the following technical scheme to provide:

an organic exhaust gas treatment device comprising:

the system comprises an organic waste gas inlet pipeline communicated with a waste gas outlet of the paint dipping furnace and a waste heat return pipeline communicated with a hot air inlet of the paint dipping furnace, wherein a filter, a catalytic chamber, a centrifugal fan and an external heat exchanger which are respectively connected with a control system are sequentially communicated between the organic waste gas inlet pipeline and the waste heat return pipeline along the gas flowing direction; the filter is used for filtering particulate matters in the organic waste gas conveyed by the organic waste gas inlet pipeline so as to output the particle-free organic waste gas; the catalytic chamber receives the particle-free organic waste gas, heats the particle-free organic waste gas to a reaction temperature, carries out catalytic combustion reaction to generate harmless hot gas, absorbs a part of heat in the harmless hot gas to heat the particle-free organic waste gas, and then cools the harmless hot gas into catalytic tail gas to be discharged; after the centrifugal fan conveys the catalytic tail gas to the outer heat exchanger, the outer heat exchanger absorbs heat in the catalytic tail gas, heats the extracted outside air at a controlled temperature to form oxygen-containing hot air, conveys the oxygen-containing hot air back to the furnace through a waste heat return pipeline, and simultaneously discharges the catalytic tail gas after the absorbed heat to form standard tail gas.

The catalytic combustion principle is illustrated as follows: the catalyst is used as an intermediate, so that the organic waste gas is changed into harmless water and carbon dioxide gas at a lower temperature, namely:

the catalytic combustion is essentially a gas-solid reaction, so that active oxygen participates in deep oxidation, and in the catalytic combustion process, the catalyst has the function of reducing activation energy, and meanwhile, the surface of the catalyst has an adsorption function, so that reactant molecules are enriched on the surface, the reaction rate is improved, and the reaction is accelerated. Therefore, the organic waste gas can be subjected to flameless combustion under the condition of a lower ignition temperature by the catalyst, and is oxidized and decomposed into carbon dioxide and water, and simultaneously, a large amount of heat energy is released, so that the efficiency is high, and no secondary pollution is caused. The control system controls the catalytic chamber, the centrifugal fan and the outer heat exchanger, the heating and catalytic temperature control of the catalytic chamber are controlled by the PLC program of the control system in a full-automatic mode, the temperature of outlet gas is guaranteed to meet the technical design requirements, organic waste gas is discharged after reaching standards, heat after catalytic combustion is recovered to the paint dipping furnace for use, and electric energy used for heating of the paint dipping furnace is effectively saved.

Therefore, the organic waste gas for the paint dipping process in the motor manufacturing industry comprises the following steps: the invention has the characteristics of high concentration of organic waste gas, small air volume and higher heat value, adopts a combined process of a direct catalytic combustion method and heat recovery, is provided with a filter for filtering particles in the organic waste gas, the particles of the organic waste gas are mainly dust and condensed oily substances in the organic waste gas dried by a paint dipping furnace, a catalytic chamber is used for catalytically burning and decomposing the organic waste gas to generate harmless hot gas, a centrifugal fan is used for extracting and conveying the harmless hot gas to an external heat exchanger to provide gas conveying power, the external heat exchanger extracts external oxygen-containing hot air to absorb heat in the harmless hot gas, the oxygen-containing hot air is conveyed back to the furnace for cyclic utilization after being used as the oxygen-containing hot air matched with the paint dipping combustion temperature requirement of the paint dipping furnace, the heat is recycled, and the harmless hot gas is formed into harmless tail gas which reaches the standard and is discharged outside, so as to achieve the.

In some embodiments, the catalytic chamber comprises: the internal heat exchanger is communicated with the downstream of the filter, and heats the particle-free organic waste gas which flows into the internal heat exchanger by absorbing heat to form preheated waste gas and then discharges the preheated waste gas; the heater is communicated with one side of the inner heat exchanger, receives an instruction of the control system for performing compensation heating on the preheated waste gas, and then is electrified to heat and control the temperature of the preheated waste gas passing through the heater so as to output reaction waste gas reaching the catalytic combustion reaction temperature; the catalysis bin is arranged below the heater and communicated with the inner heat exchanger, receives reaction waste gas to perform catalytic combustion reaction so as to generate harmless hot gas with combustion heat, and the harmless hot gas is absorbed by a part of heat when flowing through the inner heat exchanger to form catalytic tail gas to be discharged out of the catalysis chamber.

Therefore, after the organic waste gas is filtered to remove particles in the organic waste gas, the organic waste gas enters the inner heat exchanger through the catalytic chamber to be heated, then is subjected to compensation heating through the heater to reach the combustion reaction temperature, and is decomposed to generate heat, carbon dioxide and water through the action of the catalyst of the catalytic bed; the heat generated by decomposition enters an 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 raised to reach the reaction temperature; after heating, if the temperature of the organic waste gas cannot reach the reaction temperature, the heater can realize compensation heating through an automatic control system, so that the temperature of the organic waste gas reaches the reaction temperature to be completely combusted, the energy is saved, the effective removal rate of the organic waste gas reaches the standard and is discharged, and the national discharge standard is met.

In some embodiments, the catalytic chamber further comprises: the honeycomb ceramic heat preservation, the butt joint is in one side of heater output reaction waste gas and set up in catalysis storehouse top, has seted up on the honeycomb ceramic heat preservation to be netted a plurality of honeycomb holes of laying and the aperture is the same, and honeycomb hole transversely docks the heater, is heated or the heat absorption is released heat and is stored heat by this inner wall when contacting honeycomb hole's inner wall through reaction waste gas lateral flow.

The honeycomb ceramic heat-insulating layer is in a porous thin-walled honeycomb ceramic shape formed by axially abutting a plurality of honeycomb holes with the same pore diameter, so that the geometric surface area of the carrier is greatly increased, and the thermal shock resistance is improved; moreover, the honeycomb holes can improve the thermal shock resistance trend of the honeycomb ceramic heat-insulating layer and the temperature of thermal shock damage along with the improvement of the number of holes in unit area and the reduction of the thickness of carrier pore walls, can further store heat and release heat for reaction waste gas, and effectively reduce the power-on heating amount of the heater by reducing heat loss to save electric energy. Therefore, the honeycomb ceramic heat-insulating layer can absorb heat in the organic waste gas between the heater and the catalytic bin so as to store heat and release heat for the heated or compensated heated organic waste gas, so that the heated organic waste gas can reach the reaction temperature when the heater is not required to perform compensation heating, the organic waste gas reaching the reaction temperature flows to the catalytic bin to perform catalytic combustion reaction, and the heat recovery characteristics of circular energy conservation and environmental protection utilization are realized.

In some embodiments, an exhaust gas flow cavity for mixed circulation of reaction exhaust gas is arranged between the honeycomb ceramic heat-insulating layer and the catalytic cabin, a pressure relief explosion-proof piece connected with a control system is arranged in the exhaust gas flow cavity, and the pressure relief explosion-proof piece is arranged on the side surface of the catalytic cabin and is communicated with the outside for detecting the exhaust gas pressure in the exhaust gas flow cavity to perform exhaust pressure relief.

Therefore, when the control system detects that the temperature of reaction exhaust gas flowing to the catalytic cabin in the exhaust gas circulation cavity is too high, the control system controls to open the pressure relief explosion-proof piece to supplement air to the exhaust gas circulation cavity, so that the temperature of organic exhaust gas is reduced, the catalytic cabin is prevented from being too high, and catalytic combustion reaction cannot be stably carried out.

In some embodiments, the method comprises: the temperature measurement device comprises a first temperature measurement part, a second temperature measurement part and a third temperature measurement part which are respectively connected with a control system, wherein the first temperature measurement part is arranged between an inner heat exchanger and a heater and is used for measuring the current temperature of preheated waste gas flowing to the heater and forming first temperature measurement information to be sent to the control system; the second temperature measuring part is arranged between the heater and the catalytic cabin and is used for measuring the current temperature of the reaction waste gas flowing to the catalytic cabin, forming second temperature measuring information and sending the second temperature measuring information to the control system, and the control system controls the electric heating time and the heating temperature of the heater for controlling the temperature of the preheated waste gas according to the second temperature measuring information; and the third temperature measuring part is arranged between the catalytic bin and the inner heat exchanger and used for measuring the current temperature of harmless hot gas flowing to the inner heat exchanger, forming third temperature measuring information and sending the third temperature measuring information to the control system, and the control system controls the electrifying time and the heating temperature of the inner heat exchanger for heating the preheated waste gas according to the third temperature measuring information.

Therefore, when the control system detects that the temperature of the organic waste gas heated by the inner heat exchanger reaches the preset catalytic temperature of 300-350 ℃ through the first temperature measuring part, the control system automatically stops heating of the heater; when the temperature of the organic waste gas heated by the internal heat exchanger is measured to be lower than the preset catalytic reaction temperature, the control system starts the heater to perform compensation heating on the organic waste gas, so that the catalytic temperature of the organic waste gas is maintained at 300-350 ℃; when the control system detects that the temperature of reaction exhaust gas in the exhaust gas circulation cavity is too high through the second temperature measuring part, the temperature of the catalytic cabin can be detected to be too high, at the moment, the control system controls the opening of the pressure relief explosion-proof part to supplement air to the exhaust gas circulation cavity, the temperature of organic exhaust gas is reduced, and therefore the temperature of the catalytic cabin is prevented from being too high.

In some embodiments, the inner heat exchanger is obliquely abutted against the inside of the catalytic chamber, one side of the inner heat exchanger is connected with a heat insulation plate, the heater is arranged between the heat insulation plate and the top surface of the catalytic chamber, the catalytic bin is abutted against the bottom surface of the catalytic chamber, and two sides of the catalytic bin are respectively communicated with the inner heat exchanger and the heater; the side gas inlet and last gas vent have been seted up to the catalysis room, and interior heat exchanger is equipped with the side gas inlet of intercommunication and is used for receiving the waste gas import of no granule organic waste gas, the import of intercommunication waste gas and butt joint heater are used for exporting the waste gas export of preheating waste gas, butt joint catalysis storehouse is used for receiving harmless steam inlet, the harmless steam outlet of the harmless steam inlet of harmless steam of intercommunication, intercommunication harmless steam inlet and last gas vent are used for exporting catalysis tail gas.

Therefore, organic waste gas is communicated to a waste gas inlet through an air inlet cavity in a catalytic chamber through a side air inlet, and then enters an inner heat exchanger through the waste gas inlet to be heated so as to reach the reaction temperature of 300-350 ℃ to form reaction waste gas, the reaction waste gas at 300-350 ℃ flows to a heating cavity in the catalytic chamber from a waste gas outlet of the inner heat exchanger, the organic waste gas which does not reach the reaction temperature is heated in the heating cavity by a heater to reach the reaction temperature, the reaction waste gas at 300-350 ℃ flows to a decomposition cavity in the catalytic chamber through the heating cavity, the decomposition cavity catalytically burns and decomposes the reaction waste gas at 300-350 ℃ through a catalytic bin to generate harmless hot gas at 450-550 ℃, and at the moment, the harmless hot gas at 450-550 ℃ flows into the inner heat exchanger through the harmless hot gas inlet to form anaerobic tail gas at 220-300 ℃, the anaerobic tail gas of 220-300 ℃ is discharged into a gas outlet cavity in the catalytic chamber through a harmless hot gas outlet, the anaerobic tail gas of 220-300 ℃ is discharged from the gas outlet cavity through an upper gas outlet, and the absorbed heat in the inner heat exchanger is used for heating the filtered organic waste gas to 250-300 ℃.

In some embodiments, the outer heat exchanger is provided with an oxygen-free tail gas inlet for connecting the centrifugal fan, a harmless tail gas outlet for communicating between the oxygen-free tail gas inlet and the exhaust funnel, an outer heat exchanger air inlet for communicating with the outside, and a hot air outlet for communicating between the outer heat exchanger air inlet and the blower; the harmless gas enters the outer heat exchanger through the oxygen-free tail gas inlet to perform heat exchange and temperature reduction to form standard-reaching tail gas, the tail gas is discharged to the outside through the harmless tail gas outlet through the exhaust funnel, the air inlet of the outer heat exchanger serves as a cold air inlet to enable the outside air to enter the outer heat exchanger to perform heat exchange and temperature rise to form oxygen-containing hot air, and the oxygen-containing hot air is conveyed back to the furnace through the hot air outlet through a waste heat backflow pipeline under the conveying power of the air feeder.

The centrifugal fan is used for conveying anaerobic tail gas into an outer heat exchanger through an anaerobic tail gas inlet, the outer heat exchanger receives the anaerobic tail gas and absorbs about 35% of heat in the anaerobic tail gas to enable the anaerobic tail gas to form standard tail gas to be discharged from a harmless tail gas outlet, and other residual heat in the discharged standard tail gas can be recycled; at the same time, the external heat exchanger uses a part of the heat absorbed from the oxygen-free tail gas for reuse: the external air enters the outer heat exchanger through the air inlet of the outer heat exchanger, and is heated and heated by using a part of heat of the anaerobic tail gas absorbed by the outer heat exchanger to form oxygen-containing hot air, and the oxygen-containing hot air is conveyed from the hot air outlet through the residual heat return pipeline under the action of the air blower to be recycled.

In some embodiments, the method comprises: the dust removal flame arrester is communicated between the filter and the catalytic chamber through a pipeline and is connected with a control system, and a communication pipeline between the catalytic chamber and the filter is communicated or cut off through detecting the gas flow direction in the pipeline. Wherein, dust removal spark arrester setting is in the inlet end department of catalysis room for prevent that burning wind from influencing the normal operating in workshop along with pipeline backward flow to the workshop, prevent that equipment from taking place the fire incident, guarantee the safety of the catalytic combustion reaction of catalysis room and go on.

In some embodiments, the dust removal flame arrester and the filter are provided with evacuation valves, a switch valve is communicated between the filter and the organic waste gas inlet pipeline, and the switch valve and the evacuation valve are respectively connected with the control system. From this, the evacuation valve can cooperate centrifugal fan to further realize the purification performance before this organic waste gas administers the device operation, prevent unexpected explosion effect, through evacuation valve and centrifugal fan's the exhaust function that admits air, utilizes the air to sweep pipeline (wind channel), catalytic chamber etc. clean, the unexpected explosion takes place during the catalytic combustion of preventing.

In some embodiments, the organic waste gas inlet pipeline outputs organic waste gas at 30-40 ℃, the organic waste gas with the temperature of 30-40 ℃ is heated into preheated waste gas with the temperature of 250-300 ℃ by an internal heat exchanger, the temperature of the preheated waste gas at 250-300 ℃ is controlled by a heater to form reaction waste gas at 300-350 ℃, the reaction waste gas at 300-350 ℃ is decomposed into harmless hot gas at 450-500 ℃ through catalytic combustion in the catalytic bin, the harmless hot gas at 450-500 ℃ is absorbed by the inner heat exchanger to form anaerobic tail gas at 220-300 ℃ and is conveyed to the outer heat exchanger by the centrifugal fan, the outer heat exchanger absorbs part of the heat of the anaerobic tail gas at 220-300 ℃ to make outside air into oxygen-containing hot air at 120-150 ℃ to convey the oxygen-containing hot air back to the furnace, and the catalytic tail gas after absorbing heat is discharged at 80-130 ℃.

Therefore, after the organic waste gas with the temperature of 30-40 ℃ output by a paint dipping furnace workshop is filtered to remove particles in the organic waste gas, the organic waste gas enters an inner heat exchanger through a catalytic chamber and is heated to 250-350 ℃, the organic waste gas reaches the reaction temperature of 300-350 ℃, the organic waste gas reaching the reaction temperature of 300-350 ℃ is decomposed to generate harmless hot gas with the temperature of 450-500 ℃ under the action of a catalyst of a catalytic bed, the harmless hot gas with the temperature of 450-500 ℃ enters the inner heat exchanger to exchange heat with the organic waste gas with the temperature of 30-40 ℃ which enters the inner heat exchanger for the first time, the recycling of heat energy is realized, and the temperature of the organic waste gas without the particles after being filtered is increased to reach the reaction temperature; when heating, if the temperature of the organic waste gas does not reach the reaction temperature, the heater can realize compensation heating through an automatic control system, so that the organic waste gas can simultaneously emit a large amount of heat energy to form harmless hot gas at 450-500 ℃ under the condition of lower ignition temperature by means of a catalyst after the temperature of the organic waste gas reaches the reaction temperature, the harmless hot gas at 450-500 ℃ absorbs a part of heat through an inner heat exchanger to form anaerobic tail gas at 220-300 ℃ to be discharged, the anaerobic tail gas at 220-300 ℃ is used for preparing external air into oxygen-containing hot air at 120-150 ℃ through an outer heat exchanger and then is conveyed back to a furnace to form standard tail gas at 80-130 ℃ to be discharged outside, the standard discharge is realized, the recovery efficiency of the organic waste gas is high, and no secondary pollution is caused.

In some embodiments, the method comprises: the air volume adjusting valve is communicated between the catalytic chamber and the centrifugal fan through a pipeline and is connected with the control system, the air volume adjusting valve is used for detecting the air pressure change of harmless hot air in the pipeline and forming air pressure information to be sent to the control system, and the control system controls the air volume adjusting valve to adjust the sectional area of the communicated pipeline according to the air pressure information so that the harmless hot air can stably flow to the external heat exchanger under negative pressure.

Wherein, air regulation valve embeds there are the converter with the pipeline intercommunication and the silica gel capsule that is located the middle of the converter, air regulation valve's constant flow function is the pipe diameter size that realizes with the pipeline intercommunication through the shrink and the inflation/shrink of the silica gel capsule that is located the middle of the converter to control air volume and wind pressure, from this, control system can connect this converter through the wind pressure controller, reach the purpose that utilizes the interior wind pressure of air regulation valve control pipeline through controlling the converter. Therefore, when the air pressure and the air volume change, the air volume regulating valve automatically regulates the sectional area communicated with the pipeline through the instruction information of the control system, so that the downstream air volume and the upstream air volume in the pipeline are stable, the harmless hot air conveyed in the pipeline is kept in a stable air pressure range, the stability of the waste gas treatment work in the whole waste gas treatment device is further ensured, and the maintenance is simple and the stable work is realized.

In some embodiments, a method of treating an exhaust gas of an organic exhaust gas treatment device, comprises the steps of:

and (3) filtering: conveying the organic waste gas output by the paint dipping furnace to a filter through an organic waste gas inlet pipeline to remove particles in the organic waste gas;

tempering prevention: conveying the organic waste gas with the filtered particles into a catalytic chamber through a dust removal flame arrester;

preheating: an inner heat exchanger obliquely arranged in the catalytic chamber is communicated with the dust and flame arrester 4 through a pipeline, receives the organic waste gas filtered of particulate matters, and heats the organic waste gas to form preheated waste gas;

compensation heating: a heater is communicated above one side of the inner heat exchanger, and the heater carries out compensation heating on the preheated waste gas which does not reach the reaction temperature so as to form reaction waste gas reaching the reaction temperature;

heat storage and release: one side of the heater is communicated with the honeycomb ceramic heat insulation layer, so that the heated reaction waste gas is subjected to heat storage and release through the honeycomb ceramic heat insulation layer to keep the reaction temperature;

catalytic combustion: a catalysis bin is arranged below the honeycomb ceramic heat-insulating layer and the heater, one side of the catalysis bin is butted with the honeycomb ceramic heat-insulating layer through an exhaust gas flow through cavity, and the catalysis bin receives reaction exhaust gas reaching the reaction temperature and carries out catalytic combustion reaction to generate harmless hot gas;

primary heat exchange: communicating the catalysis bin below one side of the inner heat exchanger, receiving the harmless hot gas discharged by the catalysis bin by the inner heat exchanger, receiving part of heat in the harmless hot gas for preheating the organic waste gas in the step S3, and discharging the other part of harmless hot gas from the catalysis chamber, namely reducing the harmless hot gas by the inner heat exchanger to form harmless tail gas for discharging;

conveying: communicating the catalytic chamber with a centrifugal fan, and conveying harmless tail gas to an external heat exchanger by the centrifugal fan;

secondary heat exchange and heat energy recovery: an air feeder is arranged between the outer heat exchanger and the waste heat return pipeline, the outer heat exchanger absorbs part of heat of the oxygen-free tail gas to prepare oxygen-containing hot air from outside air, and the oxygen-containing hot air is conveyed back to the furnace through the waste heat return pipeline under the power of the air feeder for cyclic utilization;

exhausting: and communicating the outer heat exchanger with the exhaust funnel, and discharging the catalytic tail gas after the outer heat exchanger absorbs heat to the standard through the exhaust funnel.

The temperature of the organic waste gas output by the organic waste gas inlet pipeline is 30-40 ℃, the organic waste gas at 30-40 ℃ is heated into organic waste gas at 250-300 ℃ through the inner heat exchanger, the organic waste gas at 250-300 ℃ is heated by the heater to reach the reaction temperature of 300-350 ℃, the organic waste gas at 300-350 ℃ is catalyzed and combusted into harmless hot gas at 450-500 ℃ through the catalytic bin, the harmless hot gas at 450-500 ℃ is subjected to heat exchange through the inner heat exchanger to form oxygen-free tail gas at 220-300 ℃, and the oxygen-free tail gas at 220-300 ℃ forms standard tail gas to be discharged outside after being absorbed by the outer heat exchanger.

Drawings

FIG. 1 is a schematic structural diagram of an organic waste gas treatment device according to an embodiment of the present invention;

FIG. 2 is a plan view of an organic waste gas treatment device according to an embodiment of the present invention;

FIG. 3 is a schematic flow diagram of an organic waste gas treatment device according to an embodiment of the present invention;

FIG. 4 is another schematic flow diagram of an organic waste gas treatment device according to an embodiment of the present invention;

FIG. 5 is an internal side view of a catalytic chamber of an embodiment of the invention;

FIG. 6 is a schematic view of the internal structure of the catalytic chamber according to an embodiment of the invention;

FIG. 7 is a schematic structural diagram of an external heat exchanger according to an embodiment of the present invention;

FIG. 8 is a front view of a honeycomb ceramic insulation layer according to an embodiment of the present invention.

Reference numerals:

an organic exhaust gas inlet duct; 2. a waste heat return pipe; 3. a filter; 4. a dust removal flame arrester; 5. a catalyst chamber; 511. a side intake port; 512. an upper vent; 513. an air inlet cavity; 514. a heating cavity; 515. a decomposition chamber; 516. an air outlet cavity; 517. an exhaust gas recirculation chamber; 52. an inner heat exchanger; 521. an exhaust gas inlet; 522. an exhaust gas outlet; 523. a harmless hot gas inlet; 524. a harmless hot gas outlet; 53. a heater; 54. a honeycomb ceramic heat-insulating layer; 55. a catalysis bin; 56. a pressure relief explosion-proof piece; 57. a support plate; 58. a partition plate; 59. a pneumatic valve; 501. a first temperature measuring member; 502. a second temperature measuring part; 503. a third temperature measuring part; 6. a centrifugal fan; 7. an external heat exchanger; 71. an oxygen-free tail gas inlet; 72. a harmless tail gas outlet; 73. an outer heat exchanger air inlet; 74. a hot air outlet; 8. an exhaust funnel; 9. opening and closing the valve; 10. an evacuation valve; 11. an air volume adjusting valve.

Detailed Description

The technical scheme and the beneficial effects of the invention are clearer and clearer by further describing the specific embodiment of the invention with the accompanying drawings of the specification.

Referring to fig. 1 to 8, an organic waste gas treatment device of the present embodiment includes: the device comprises an organic waste gas inlet pipeline 1, a waste heat return pipeline 2, a filter 3, a dust removal flame arrester 4, a catalytic chamber 5, a centrifugal fan 6, an outer heat exchanger 7 and an exhaust funnel 8. Specifically, the method comprises the following steps: in the embodiment, an organic waste gas inlet pipeline 1 is communicated with a waste gas outlet of a paint dipping furnace, a waste heat return pipeline 2 is communicated with a hot air inlet of the paint dipping furnace, a filter 3, a dust-removing flame arrester 4, a catalytic chamber 5, a centrifugal fan 6 and an external heat exchanger 7 are sequentially arranged between the organic waste gas inlet pipeline 1 and the waste heat return pipeline 2, and the filter 3, the dust-removing flame arrester 4, the catalytic chamber 5, the centrifugal fan 6 and the external heat exchanger 7 are respectively connected with a control system (not marked in the figure); wherein, the gas flow direction and the heat energy flow direction in the organic waste gas inlet pipeline 1 and the waste heat recovery pipeline 2 are set to be the same direction: one side of filter 3 is equipped with switching valve 9 butt joint organic waste gas inlet line 1, and the opposite side of filter 3 is equipped with evacuation valve 10 intercommunication dust removal spark arrester 4, and dust removal spark arrester 4 communicates catalysis room 5, and catalysis room 5 passes through outer heat exchanger 7 of centrifugal fan 6 intercommunication, and one side of outer heat exchanger 7 is passed through forced draught blower 12 and is communicated waste heat return line 2, and the opposite side of outer heat exchanger 7 is equipped with the outside aiutage 8 of intercommunication. In the invention, a filter 3 is communicated with an air outlet end of an organic waste gas inlet pipeline 1 for filtering particles in organic waste gas, a dedusting flame arrester 4 is used for preventing combustion hot air in a catalytic chamber 5 from flowing back to a workshop through a pipeline to influence the safe operation of the workshop, the catalytic chamber 5 is communicated between the filter 3 and a centrifugal fan 6, the catalytic chamber 5 is used for heating the organic waste gas so as to be capable of performing catalytic combustion decomposition to generate harmless hot gas, meanwhile, the catalytic chamber 5 absorbs a part of heat of the harmless hot gas for heating the particle-free organic waste gas, the harmless hot gas generated by the catalytic combustion decomposition of the particle-free organic waste gas is cooled to form harmless tail gas and then is discharged out of the catalytic chamber 5, the centrifugal fan extracts the harmless tail gas from the catalytic chamber 5 and conveys the harmless tail gas to an outer heat exchanger 7, wherein the outer heat exchanger 7 is communicated with a residual heat return pipeline 2 through a blower 12, and the oxygen-, make this oxygen-containing hot-blast process waste heat backflow pipeline 2 carry back to dip coating stove and realize heat cyclic utilization, moreover, one side of outer heat exchanger 7 is provided with the outside aiutage 8 of intercommunication, will discharge tail gas up to standard through exhaust duct through aiutage 8, carries out discharge up to standard.

As shown in fig. 5 to 6, in the present embodiment, the internal heat exchanger 52, the heater 53, and the catalytic cabin 55 are disposed in the catalytic chamber 5, specifically: the catalytic chamber 5 is provided with a side air inlet 511 and an upper air outlet 512, the side air inlet 511 is communicated with the dedusting flame arrester 4 through a pipeline, the upper air outlet 512 is communicated with the centrifugal fan 6 through a pipeline, the side air inlet 511 and the upper air outlet 512 are respectively arranged above and below the same side of the inner heat exchanger 52 and are communicated through the inner heat exchanger 52, and the inner heat exchanger 52 receives the filtered organic waste gas through the side air inlet 511 and heats the organic waste gas; a heater 53 is arranged above the other side of the inner heat exchanger 52, and the heater 53 is used for compensating and heating the heated organic waste gas which is output after heat exchange of the inner heat exchanger 52 and does not reach the reaction temperature to the reaction temperature; a catalytic bin 55 is arranged below the heater 53, a catalyst which can perform catalytic combustion reaction with the reaction exhaust gas flowing into the catalytic bin 55 is placed in the catalytic bin 55, and harmless hot gas generated by decomposition in the catalytic bin 55 is discharged through the upper exhaust port 512 from the other side of the inner heat exchanger 52.

As shown in fig. 5 to 6, in the present embodiment, the catalyst chamber 5 further includes: the temperature measuring device comprises a first temperature measuring part 501, a second temperature measuring part 502 and a third temperature measuring part 503, wherein the first temperature measuring part 501, the second temperature measuring part 502 and the third temperature measuring part 503 are respectively connected with a control system. Wherein: the first temperature measuring part 501 is arranged between the inner heat exchanger 52 and the heater 53 and is used for measuring the temperature of the heated organic waste gas; the second temperature measuring part 502 is arranged between the heater 53 and the catalytic cabin 55 and is used for measuring the temperature of the organic waste gas which is subjected to catalytic combustion decomposition in the catalytic cabin; the third temperature measuring part 503 is arranged between the catalytic bin 55 and the internal heat exchanger 52 and is used for measuring the temperature of the harmless hot gas generated by catalytic combustion decomposition. Specifically, the method comprises the following steps: the first temperature measuring member 501 is installed on the top surface of the catalyst chamber 5, the second temperature measuring member 502 is installed on the side surface of the catalyst chamber 5, and the third temperature measuring member 503 is installed on the bottom surface of the catalyst chamber 5.

Thus, the control system controls the temperature measuring material, the internal heat exchanger 52, and the heater 53. Specifically, the method comprises the following steps: when the control system detects that the temperature of the organic waste gas heated by the internal heat exchanger 52 reaches the preset catalytic temperature through the first temperature measuring part 501, the control system automatically stops the supplementary heating of the heater 53; when the control system detects that the temperature of the organic waste gas heated by the internal heat exchanger 52 does not reach the preset catalytic temperature through the first temperature measuring part 501, the control system starts the heater 53 to perform compensation heating so as to reach the reaction temperature; when the control system detects that the temperature of the organic waste gas in the catalytic chamber 55 is overhigh through the second temperature measuring part 502, the control system stops heating of the heater or supplies air to the catalytic chamber 5 through the pressure relief explosion-proof part 56 to prevent the temperature of the catalytic chamber 55 from being overhigh; when the control system detects the temperature of harmless hot gas generated by the current catalytic combustion decomposition through the third temperature measuring part 503, the inner heat exchanger 52 can be controlled to be electrified or not electrified for heating so as to preheat the filtered organic waste gas, when the third temperature measuring part 503 detects that the temperature of the catalytic combustion decomposition reaches a certain temperature value, the control system can control the inner heat exchanger 52 to directly preheat the organic waste gas by directly utilizing the heat generated by the catalytic combustion decomposition without being electrified for heating, and when the third temperature measuring part 503 detects that the temperature of the catalytic combustion decomposition is too low, the control system can control the inner heat exchanger 52 to be electrified for auxiliary heating so as to preheat the organic waste gas together with the heat generated by the catalytic combustion decomposition, thereby achieving the effect of stable heating, realizing real-time monitoring and ensuring the automatic, intelligent and efficient operation of the equipment.

As shown in fig. 5 to 6, in the present embodiment, the catalyst chamber 5 further includes: and the honeycomb ceramic heat insulation layer 54 is arranged in the catalytic chamber 5 and is positioned between the heater 53 and the catalytic cabin 55, and is used for absorbing the redundant heat of the organic waste gas heated by the internal heat exchanger 52 or the heater 53 so as to store heat and release heat. The honeycomb ceramic heat-insulating layer 54 can absorb heat in the organic waste gas between the heater 53 and the catalytic bin 55 to store heat and release heat for the heated or compensated heated organic waste gas, so that the heated organic waste gas can reach a reaction temperature when the heater 53 is not required to perform compensation heating, the reaction waste gas flows to the catalytic bin to perform catalytic combustion reaction, and the heat recovery characteristics of circular energy conservation and environmental protection utilization are realized.

Further, as shown in fig. 8, a plurality of honeycomb holes 541 are formed in the honeycomb ceramic insulating layer 54, which are arranged in a mesh shape and have the same pore diameter, and the honeycomb holes 541 are horizontally butted with a heater, so that reaction exhaust gas is heated or absorbs heat by the inner wall of the honeycomb holes 541 when contacting the inner wall so as to release and store heat. Therefore, the honeycomb ceramic heat-insulating layer 54 is in various shapes formed by countless equal holes of honeycomb ceramics, wherein the maximum number of the holes can reach 120-140 per square centimeter, the density is 0.3-0.6 g per cubic centimeter, and the water absorption rate can reach up to more than 20%; the honeycomb holes are axially abutted and have the same pore diameter to form a porous thin-walled honeycomb ceramic shape, so that the geometric surface area of the carrier is greatly increased, and the thermal shock resistance is improved; furthermore, the honeycomb holes 541 can be arranged to be main mesh holes with triangle and/or square as catalytic carriers, so that the temperature of the thermal shock resistance trend and thermal shock damage of the honeycomb ceramic insulating layer 54 can be increased simultaneously with the increase of the number of holes in unit area and the reduction of the thickness of the carrier pore walls, the reaction waste gas can be further stored and released heat, the electric energy is saved by reducing the heat loss, and the electrification heating quantity of the heater is effectively reduced. Therefore, the honeycomb ceramic heat insulation layer 54 is used for receiving the excess heat of the organic waste gas heated by the inner heat exchanger 52 or the heater 53 for heat storage and heat release, wherein the honeycomb ceramic heat insulation layer 54 can absorb the heat in the organic waste gas between the heater and the catalytic cabin to store heat and release heat for the heated or compensated organic waste gas, so that the heated organic waste gas can reach the reaction temperature when the heater 53 is not required for compensation heating, the organic waste gas reaching the reaction temperature flows to the catalytic cabin 55 for catalytic combustion reaction, and the heat recovery characteristics of circulation energy conservation and environmental protection utilization are realized.

As shown in fig. 5-6, in the present embodiment, the internal heat exchanger 52 is obliquely abutted against the inside of the catalytic chamber 5 and sequentially divides the catalytic chamber 5 into an air intake chamber 513, a heating chamber 514, a decomposition chamber 515 and an air outlet chamber 516, wherein the internal heat exchanger 52 is provided with an exhaust gas inlet 521, an exhaust gas outlet 522, a harmless hot gas inlet 523 and a harmless hot gas outlet 524 which are communicated with the side air inlets 511, the air intake chamber 513 is communicated between the side air inlets 511 and the exhaust gas inlet 521, the heating chamber 514 is communicated between the exhaust gas outlet 522 and the exhaust gas flow-through chamber 517, the heating chamber 514 is provided with a heater 53 which is in butt joint with the exhaust gas outlet 522 and a honeycomb ceramic heat insulation layer which is positioned on one side of the heater 53, the decomposition chamber 515 is provided with the catalytic bin 55 which is positioned between the honeycomb ceramic heat insulation layer and.

As shown in fig. 5 to 6, in the present embodiment, the catalyst chamber 5 further includes: waste gas circulation chamber 517, waste gas circulation chamber 517 intercommunication is between heating chamber 514 and decomposition chamber 515, and waste gas circulation chamber 517 docks between honeycomb ceramic heat preservation and catalysis storehouse 55 and flows for reaction waste gas, is equipped with the explosion-proof piece 56 of release of connection control system in the waste gas circulation chamber 517. Specifically, the method comprises the following steps: one side of the catalysis bin 55 is butted with the internal heat exchanger 52, an exhaust gas circulation cavity 517 is arranged between the other side of the catalysis bin 55 and the honeycomb ceramic heat insulation layer 54, and the exhaust gas circulation cavity 517 is used for mixing and flowing of reaction exhaust gas, so that the heated organic exhaust gas can be fully heated in the cavity to accelerate the combustion reaction rate. In this embodiment, the pressure relief vent 56 is mounted in the catalytic chamber 5 to communicate between the exterior and the exhaust gas flow through cavity 517. Specifically, as shown in fig. 5 and 6, the pressure relief explosion-proof member is installed on the side of the catalytic chamber 5, when the temperature of the catalytic chamber 55 is too high, the air supply valve is opened to supply fresh air to the exhaust gas flow through cavity 517, and the temperature of the catalytic chamber 55 can be effectively controlled by reducing the temperature of the organic exhaust gas in the exhaust gas flow through cavity 517, so that the catalytic chamber 55 is prevented from being too high in temperature, the catalytic combustion reaction is influenced, the air pressure in the catalytic chamber is caused to be too high, and the occurrence of safety accidents is avoided. Wherein, the pressure relief explosion-proof piece 56 can be set as a supplement air valve or a safety pressure relief valve.

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

As shown in fig. 5 and 6, the exhaust gas inlet 521 is disposed below the left side of the internal heat exchanger 52 and communicates with the side intake opening 511 for allowing the organic exhaust gas to flow into the internal heat exchanger 52 through the intake chamber 513, so that the organic exhaust gas can enter the intake chamber 513 of the catalytic chamber 5 from the side intake opening 511 below the catalytic chamber 5 and enter the internal heat exchanger 52 obliquely along the exhaust gas inlet 521 below the side of the internal heat exchanger 52 in the intake chamber 513 for heating; therefore, the organic waste gas can be preheated in a better circulation direction, the reactive loss of heat in the organic waste gas is reduced, and the heat utilization rate is improved;

as shown in fig. 5, the exhaust gas outlet 522 is disposed above the right side of the inner heat exchanger 52 and is connected to the heater 53 for discharging the preheated organic exhaust gas after the heat is released by the inner heat exchanger 52 into the heating cavity 514 for heating or storing heat to the combustion reaction temperature; therefore, organic waste gas is heated in the inner heat exchanger 52 and then is discharged from the waste gas outlet 34 to enter the heating cavity 514 provided with the heater 53, the heater 53 is arranged above the side of the inner heat exchanger to be butted with the waste gas outlet 34, the heated organic waste gas can be directly heated to reach the combustion reaction temperature under the condition that the combustion reaction temperature is not reached, the heating rate is high, meanwhile, unnecessary heat consumption caused by circulation of the heated organic waste gas in a long flow channel is avoided, the heat utilization rate is improved, and the combustion reaction rate is accelerated.

As shown in fig. 5, the harmless hot gas inlet 523 is disposed below the right side of the inner heat exchanger 52, and the harmless hot gas inlet 523 is located below the exhaust gas outlet 522 and is connected to the catalytic cabin 55 for receiving the harmless hot gas generated by the catalytic combustion reaction in the catalytic cabin 55; because the catalysis chamber 55 is arranged below the heater 53 and the honeycomb ceramic heat-insulating layer 54, and the exhaust gas circulation chamber 517 is arranged between the honeycomb ceramic heat-insulating layer 54 and the catalysis chamber 55, the organic exhaust gas forms reaction exhaust gas after being heated by the heater 53 and the honeycomb ceramic heat-insulating layer 54, the reaction exhaust gas can circulate to the exhaust gas circulation chamber 517 along the heating chamber 514 from the inner upper part of the catalysis chamber 5, the organic exhaust gas in the exhaust gas circulation chamber 517 can flow to the catalysis chamber 55 of the decomposition chamber 515 from top to bottom, so as to perform combustion catalytic reaction with the catalyst contained in the catalysis chamber 55, so as to combust and decompose the organic exhaust gas into harmless hot gas and generate a large amount of heat, therefore, the harmless hot gas (the harmless hot gas mixed by the two gases) directly enters the inner heat exchanger 52 through the harmless hot gas inlet 523 below the right side of the inner heat exchanger 52 in the decomposition chamber 515, the decomposition chamber 515 provides a sufficient harmless flowing, 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.

As shown in fig. 5, a harmless hot gas outlet 524 is disposed above the left side of the inner heat exchanger 52 and communicates with the upper exhaust port 512 through the exhaust chamber 516, and the harmless hot gas outlet 524 is located above the exhaust gas inlet 521. Therefore, when the inner heat exchanger 52 absorbs part of heat and discharges the residual harmless hot gas from the harmless hot gas outlet 524 through the gas outlet cavity 516, the harmless hot gas carrying a large amount of heat can be discharged from the upper outlet of the inner heat exchanger 52 more easily, and the heat is prevented from flowing out of the catalytic chamber 5 quickly through the gas outlet cavity 516, so that the preheating degree of the inner heat exchanger 52 on the organic waste gas is improved, and in the embodiment, the upper gas outlet 512 of the catalytic chamber 5 is arranged on the top surface of the catalytic chamber 5, so that the harmless hot gas outlet 524 and the upper gas outlet 512 are in quick butt joint, the harmless hot gas and part of heat after the combustion reaction are quickly discharged to be reused to the paint dipping furnace, the heat utilization rate is improved, and the combustion reaction rate is accelerated.

As shown in fig. 5 and 6, in the present embodiment, the internal heat exchanger 52 is obliquely abutted between the top surface and the bottom surface of the catalytic 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 catalytic chamber 5, the support plate 57 is used for supporting the heater 53 and the support plate 57 of the honeycomb ceramic insulating layer 54 and isolating the heater 53 from the catalytic chamber 55, the heater 53 and the honeycomb ceramic insulating layer are provided between the upper side of the support plate 57 and the top surface of the catalytic chamber 5, and the catalytic chamber 55 is provided between the lower side of the support plate 57 and the bottom surface of the catalytic chamber; a partition 58 is provided between the other side of the inner heat exchanger 52 and the side wall of the catalyst chamber 5, and the partition 58 is a partition 58 for separating the side intake ports 511 and the upper exhaust port 512. Therefore, the inner heat exchanger 52 isolates the exhaust gas inlet 521 from the harmless hot gas outlet 524 through the partition plate 58, and the inner heat exchanger 52 isolates the exhaust gas outlet 522 from the harmless hot gas inlet 523 through the support plate 57, so that four isolated cavities communicated through the inner heat exchanger 52 are formed in the catalytic chamber 5, and the stability of heat exchange operation is ensured.

In other embodiments, as shown in FIG. 5, baffle 58 is provided with pneumatic valve 59 communicating side inlet 511 with upper outlet 512. Therefore, when the catalytic combustion reaction is not needed, the operation of the inner heat exchanger 52, the heater 53 and the catalytic cabin 55 can be closed, the pneumatic valve 59 is opened, and the communication between the side air inlet 511 and the upper air outlet 512 is directly realized, so that the paint dipping furnace provided with the organic waste gas treatment equipment can normally exhaust when the heat recovery operation is not needed.

As shown in fig. 7, in the present embodiment, the outer heat exchanger 7 is provided with an oxygen-free exhaust gas inlet 71 for connecting the centrifugal fan 6, a harmless exhaust gas outlet 72 for communicating between the oxygen-free exhaust gas inlet 71 and the exhaust stack 8, an outer heat exchanger air inlet 73 for communicating with the outside, and a hot air outlet 74 for communicating the outer heat exchanger air inlet 73 and the residual heat return pipe 2. Therefore, the outer heat exchanger 7 receives oxygen-containing hot air discharged by the centrifugal fan 6 through the oxygen-free tail gas inlet 71, the outer heat exchanger 7 absorbs some heat of the oxygen-containing hot air to heat the external air drawn in through the outer heat exchanger air inlet 73 to form oxygen-containing hot air, and the oxygen-containing hot air is circulated to the residual heat return pipeline 2 through the hot air outlet 74 to be conveyed to the paint dipping furnace for utilization; and other heat in the oxygen-containing hot air and the harmless hot air are discharged outwards through the hot air discharge port 72, wherein the other discharged heat can be recycled.

As shown in fig. 1 to 4, in this embodiment, the organic waste gas treatment device further includes: and the dust removal flame arrester 4 is communicated with the organic waste gas inlet end of the catalytic chamber 5 and arranged between the filter 3 and the catalytic chamber 5 and used for preventing combustion air in the catalytic chamber 5 from flowing back to a workshop along with a pipeline. Wherein, the filter 3 is communicated with the organic waste gas inlet pipeline 1 through a switch valve 9, and an emptying valve 10 communicated with the organic waste gas inlet pipeline 1 is arranged between the filter 3 and the dedusting flame arrester 4. Evacuation valve 10 can cooperate centrifugal fan 6 to further realize the purification performance before this organic waste gas administers the device operation, prevent unexpected explosion effect, through evacuation valve 10 and centrifugal fan 6's the exhaust function that admits air, utilizes the air to sweep pipeline (wind channel), catalysis room etc. totally, takes place unexpected explosion when preventing catalytic combustion.

As shown in fig. 4, in this embodiment, an air volume adjusting valve 11 connected to the control system is disposed between the catalytic chamber 5 and the centrifugal fan 6, the air volume adjusting valve 11 is used to control the flow speed of the harmless hot air discharged from the catalytic chamber 5 to the centrifugal fan 6, and the air pressure in the pipeline is controlled under a negative pressure of-0.1 kpa, so as to achieve a stable heat energy recovery operation.

As shown in fig. 5, in this embodiment, the organic waste gas with a temperature of 30 ℃ to 40 ℃ is output from the organic waste gas inlet pipeline, the organic waste gas with a temperature of 30 ℃ to 40 ℃ is catalytically combusted in the catalytic chamber 5 to be harmless hot gas with a temperature of 450 ℃ to 500 ℃, the harmless hot gas with a temperature of 450 ℃ to 500 ℃ passes through the catalytic chamber 5 to use part of heat for preheating the organic waste gas, the heat exchange is to discharge anaerobic tail gas with a temperature of 220 ℃ to 300 ℃, and the anaerobic tail gas with a temperature of 220 ℃ to 300 ℃ is made into oxygen-containing hot air with a temperature of 120 ℃ to 150 ℃ by the external heat exchanger 7 and is sent back to the paint dipping furnace.

The following table shows the organic waste gas emission detection table before and after the organic waste gas treatment device treats the organic waste gas:

therefore, as can be seen from the above table, in the paint dipping process of the motor manufacturing industry, the concentration of the organic waste gas discharged from the paint dipping furnace is as high as 1500mg/m³The flow rate of the air volume index rod is 12000m at 8000-³The organic waste gas treatment device adopts a combined treatment process of a direct catalytic combustion method and heat recovery, and performs catalytic combustion on the discharged organic waste gas after filtration to form harmless hot gas with heat, so that after the organic waste gas discharged by the paint dipping furnace is treated by the organic waste gas treatment device, the concentration of the organic waste gas discharged outwards by the paint dipping furnace is reduced by at least 94%, the organic waste gas reaches the standard and can be recovered into the paint dipping furnace for use, and the electric energy used for heating the paint dipping furnace is effectively saved.

As shown in fig. 1 to 7, in this embodiment, the operation flow of the organic waste gas treatment device is as follows:

a. before the catalytic chamber 5 runs, the centrifugal fan 6 and the emptying valve 10 are started, the switch valve 9 is closed, and the pipeline (air channel), the catalytic chamber and the like are swept clean by air through the air inlet and exhaust functions of the emptying valve 10 and the centrifugal fan 6, so that accidental explosion during catalytic combustion is prevented;

b. when the device normally operates, the emptying valve 10 is closed, the switch valve 9 is opened, and the organic waste gas is deeply treated through the matching of the structures among the organic waste gas inlet pipeline 1, the waste heat backflow pipeline 2, the filter 3, the dust removal flame arrester 4, the catalytic chamber 5, the centrifugal fan 6, the external heat exchanger 7 and the exhaust funnel 8;

c. when the concentration of the organic waste gas treated by the catalytic chamber 5 reaches the explosion lower limit of 1/4, the concentration detector immediately gives an alarm, the heater and the inner heat exchanger of the catalytic chamber 5 are automatically closed, and the evacuation valve 10 is automatically opened at the same time, so that the concentration of the organic waste gas entering the catalytic chamber is rapidly reduced, and accidents are avoided. After the concentration of the organic waste gas in the catalytic chamber 5 is lower than the explosion lower limit of 1/4, the emptying valve 10 is closed, so that the whole device returns to normal operation.

The catalytic combustion is essentially a gas-solid reaction, so that active oxygen participates in deep oxidation, and in the catalytic combustion process, the catalyst has the function of reducing activation energy, and meanwhile, the surface of the catalyst has an adsorption function, so that reactant molecules are enriched on the surface, the reaction rate is improved, and the reaction is accelerated. The catalyst can be used for enabling the organic waste gas to be subjected to flameless combustion under the condition of a lower ignition temperature, and be oxidized and decomposed into carbon dioxide and water, and simultaneously, a large amount of heat energy is released, so that the efficiency is high, and no secondary pollution is caused.

In the present invention, the principle of catalytic combustion of the catalyst chamber 5 is explained as follows: the catalyst is used as an intermediate, so that the organic waste gas is changed into harmless water and carbon dioxide gas at a lower temperature, namely:

therefore, after organic waste gas is subjected to particulate removal through the dry filter 3, the organic waste gas is subjected to dust removal and fire prevention through the dust removal flame arrester 4, then enters the inner heat exchanger 52 to be heated, then is sent into the heating cavity to be heated through the heater 53, so that the organic waste gas reaches the combustion reaction temperature, and then is decomposed into carbon dioxide, water and a large amount of heat under the action of the catalytic cabin 55, the heat enters the inner heat exchanger 52 to exchange heat with the organic waste gas entering the inner 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 compensation heating through an automatic control system, so that the organic waste gas is completely combusted, so that energy is saved, the effective removal rate of the organic waste gas reaches the standard and is discharged.

In the embodiment, the organic waste gas output by the paint dipping furnace is generally kept at the temperature of 30-40 ℃, when the organic waste gas is conveyed to the internal heat exchanger 52 through the organic waste gas inlet pipeline 1 and the filter 3, the temperature of the organic waste gas can reach 250-300 ℃ after the internal heat exchanger 52 is started to heat the organic waste gas, at this time, after the organic waste gas is heated by the internal heat exchanger 52 and directly reaches the combustion reaction temperature, the heater 53 does not need to perform compensation heating on the organic waste gas, and the organic waste gas can directly reach the catalytic cabin 55 through the heater 53 and the honeycomb ceramic heat-insulating layer 54. After the organic waste gas is heated by the internal heat exchanger 52, the temperature of the organic waste gas is higher than the combustion reaction temperature, or when the heater 53 compensates the temperature difference between the heated temperature of the organic waste gas and the combustion reaction temperature, the honeycomb ceramic heat-insulating layer 54 can store a part of heat in the heating cavity, and release the stored heat to heat the organic waste gas which does not reach the combustion reaction temperature in the heating cavity, so that the purposes of heat storage and heat release are achieved, and the environment-friendly setting of reducing the output power of the heater 53 is achieved; thus, the oxygen-free exhaust gas after heat exchange in the catalytic chamber 5 is about 220 ℃, and the oxygen-free exhaust gas at 220 ℃ is made into hot air at 120 ℃ by the external heat exchanger 7.

Furthermore, this organic waste gas administers device sets up the function of interlocking each other through control system, and when this device was in automatic operation state, only after the operating condition possessed, could put into operation, the abnormal operation that human error and equipment trouble arouse in can avoiding the operation. When the system is in an automatic operation process, the system can select proper time to execute a shutdown program whenever an operator sends a shutdown instruction, and the system can quit operation reasonably and reliably according to process requirements. This organic waste gas administers device has following function:

1. the catalyst has the advantages of high purification efficiency up to more than 95%, long service life, capability of regeneration, smooth airflow and small resistance.

2. The safety facilities are complete: the dust removal flame arrester is arranged to reduce the dangerous combustion hidden danger of the equipment, the pressure relief explosion-proof piece can effectively protect the equipment to operate safely, and the temperature measurement piece carries out overtemperature alarm and other protection facilities.

3. Power drain: when the centrifugal fan starts to work, the heat exchanger is only required to be preheated for 15-30 minutes, and the full-power heating is realized, and only the power of the centrifugal fan is consumed during normal work. When the concentration of the organic waste gas is low, the heating is automatically and intermittently compensated through the heater and the heat exchanger.

4. Intelligent full-automatic heat exchange: the system is provided with an intelligent full-automatic catalytic chamber, the system temperature control of the catalytic chamber is controlled by a PLC program in a full-automatic manner, and the temperature of the outlet gas is guaranteed to meet the technical design requirement.

Based on the organic waste gas treatment device, the embodiment discloses a paint dipping furnace organic waste gas treatment method, which comprises the following steps:

and (3) filtering: organic waste gas output by a paint dipping furnace is conveyed to a filter 3 through an organic waste gas inlet pipeline 1 to remove particles in the organic waste gas, wherein the temperature of the organic waste gas passing through the filter 3 is between 30 and 40 ℃;

tempering prevention: the organic waste gas with the filtered particles is conveyed into a catalytic chamber 5 through a dedusting flame arrester 4, so that combustion air in the catalytic chamber 5 is prevented from flowing back to a workshop through an organic waste gas inlet pipeline 1;

preheating: an inner heat exchanger 52 obliquely arranged in the catalytic chamber 5 is communicated with the dust and flame arrester 4 through a pipeline, the inner heat exchanger 52 receives the organic waste gas filtered of particulate matters, and the organic waste gas at the temperature of 30-40 ℃ is preheated to form reaction waste gas at the temperature of 250-300 ℃;

compensation heating: a heater 53 is communicated above one side of the internal heat exchanger 52, and the heater carries out compensation heating on the organic waste gas with the temperature of below 300 ℃ to form reaction waste gas with the reaction temperature of 300-350 ℃, so that the reaction waste gas can carry out catalytic combustion reaction at the combustion reaction temperature of 300-350 ℃;

heat storage and release: one side of the heater 53 is communicated with a honeycomb ceramic heat-insulating layer 54, so that the heated organic waste gas is subjected to heat storage and heat release through the honeycomb ceramic heat-insulating layer 54 to keep the reaction temperature at 300-350 ℃, an exhaust gas circulation cavity 517 for the reaction waste gas to be fully mixed and flow is arranged at one side of the honeycomb ceramic heat-insulating layer 54, the reaction waste gas is output through the exhaust gas circulation cavity 517, and the heating output quantity of the heater 53 can be reduced through the honeycomb ceramic heat-insulating layer 54, so that the purposes of energy conservation and environmental protection are achieved;

catalytic combustion: a catalysis bin 55 is arranged below the honeycomb ceramic heat-insulating layer 54 and the heater 53, one side of the catalysis bin 55 is butted with the honeycomb ceramic heat-insulating layer 54 through an exhaust gas circulation cavity 517, the catalysis bin 55 receives the reaction temperature of 300-350 ℃ and carries out catalytic combustion reaction with the catalyst arranged in the catalysis bin 55 to generate harmless hot gas, and the temperature of the harmless hot gas is about 450-500 ℃;

primary heat exchange: communicating the catalytic cabin below one side of the inner heat exchanger 52, receiving the harmless hot gas at 450-500 ℃ discharged by the catalytic cabin by the inner heat exchanger 52, receiving part of heat in the harmless hot gas for preheating the particle-free organic waste gas in the step S3, and reducing the harmless hot gas at 450-500 ℃ to form harmless tail gas at 220-300 ℃ and discharging the harmless tail gas from the catalytic chamber;

conveying: the catalytic chamber 5 is communicated with a centrifugal fan 6, and the centrifugal fan 6 conveys harmless tail gas with the temperature of 220-300 ℃ to an external heat exchanger 7;

secondary heat exchange and heat energy recovery: a blower 12 is arranged between the external heat exchanger 7 and the waste heat return pipeline 2, the external heat exchanger 7 absorbs a part of heat of the oxygen-free tail gas at the temperature of 220-300 ℃, and oxygen-containing hot air at the temperature of 120-150 ℃ is prepared from external air and then is conveyed back to the furnace for cyclic utilization through the waste heat return pipeline 2 under the power of the blower 12;

exhausting: the outer heat exchanger 7 is communicated with the exhaust funnel 8, the exhaust funnel 8 is communicated with the outside, and the catalytic tail gas after the heat is absorbed by the outer heat exchanger 7 forms standard tail gas and is discharged outwards through the exhaust funnel 8.

Therefore, the conveyed organic waste gas with the temperature of 30-40 ℃ is converted into preheated waste gas with the temperature of 250-300 ℃ through heat exchange of the organic waste gas with the temperature of 30-40 ℃ by the inner heat exchanger 52, the preheated waste gas with the temperature of 250-300 ℃ is heated into reaction waste gas with the catalytic temperature of 300-350 ℃ by the heater 53, the reaction waste gas with the temperature of 300-350 ℃ is catalyzed and combusted into harmless hot gas with the temperature of 450-500 ℃ by the catalytic bin, the harmless hot gas with the temperature of 450-500 ℃ is converted into harmless tail gas with the temperature of 220-300 ℃ through heat exchange of the inner heat exchanger 52, and the outer heat exchanger 7 utilizes the heat of the harmless tail gas with the temperature of 220-300 ℃ to prepare oxygen-containing hot air into oxygen-containing hot air with the temperature of 120-.

In this embodiment, the catalytic chamber 5 generates heat energy by using a catalyst and electrical heating, when the catalytic chamber 5 reaches a set temperature, the mixed organic exhaust gas undergoes a catalytic decomposition reaction through the catalytic bin 55 to generate heat energy, and when the temperature of the catalytic chamber 5 exceeds the set temperature, the system stops heating, so that the power consumption of the catalytic chamber 5 is very low, and if the mixed organic exhaust gas reaches a certain temperature, the system becomes a non-power running state. The high-temperature oxygen-free tail gas after heat exchange is about 220 ℃, oxygen-containing hot air with the temperature of 120 ℃ is prepared by an external heat exchanger 7 and is sent to a paint dipping furnace for use, heat preservation of pipelines and mutual control and adjustment are well carried out, and electric energy used for heating the paint dipping furnace can be saved.

In summary, the present invention is directed to protecting an organic waste gas treatment device based on the above disclosed technical features, and the organic waste gas treatment device for the paint dipping process in the motor manufacturing industry comprises: the organic waste gas has the characteristics of high concentration, small air volume and higher heat value, and the combined treatment process of the direct catalytic combustion method and the heat recovery is adopted, so that the organic waste gas is discharged up to the standard, the heat after catalytic combustion is recovered into the paint dipping furnace for use, and the electric energy for heating the paint dipping furnace can be saved.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.

Claims

1. An organic waste gas treatment device, characterized by comprising:

the system comprises an organic waste gas inlet pipeline communicated with a waste gas outlet of the paint dipping furnace and a waste heat return pipeline communicated with a hot air inlet of the paint dipping furnace, wherein a filter, a catalytic chamber, a centrifugal fan and an external heat exchanger which are respectively connected with a control system are sequentially communicated between the organic waste gas inlet pipeline and the waste heat return pipeline along the gas flowing direction;

the filter is used for filtering particulate matters in the organic waste gas conveyed by the organic waste gas inlet pipeline so as to output the particle-free organic waste gas;

the catalytic chamber receives the particle-free organic waste gas, heats the particle-free organic waste gas to a reaction temperature, carries out catalytic combustion reaction to generate harmless hot gas, absorbs a part of heat in the harmless hot gas to heat the particle-free organic waste gas, and then cools the harmless hot gas into catalytic tail gas to be discharged;

after the centrifugal fan conveys the catalytic tail gas to the outer heat exchanger, the outer heat exchanger absorbs heat in the catalytic tail gas, heats the extracted outside air at a controlled temperature to form oxygen-containing hot air, conveys the oxygen-containing hot air back to the furnace through a waste heat return pipeline, and simultaneously discharges the catalytic tail gas after the absorbed heat to form standard tail gas.

2. The organic waste gas treatment device according to claim 1, characterized in that: the catalytic chamber is internally provided with: the internal heat exchanger is communicated with the downstream of the filter, and heats the particle-free organic waste gas which flows into the internal heat exchanger by absorbing heat to form preheated waste gas and then discharges the preheated waste gas; the heater is communicated with one side of the inner heat exchanger, receives an instruction of the control system for performing compensation heating on the preheated waste gas, and then is electrified to heat and control the temperature of the preheated waste gas passing through the heater so as to output reaction waste gas reaching the catalytic combustion reaction temperature; the catalysis bin is arranged below the heater and communicated with the inner heat exchanger, receives reaction waste gas to perform catalytic combustion reaction so as to generate harmless hot gas with combustion heat, and the harmless hot gas is absorbed by a part of heat when flowing through the inner heat exchanger to form catalytic tail gas to be discharged out of the catalysis chamber.

3. The organic exhaust gas treatment device according to claim 2, wherein the catalyst chamber further comprises: the honeycomb ceramic heat preservation, the butt joint is in one side of heater output reaction waste gas and set up in catalysis storehouse top, sets up a plurality of honeycomb holes of axial butt on the honeycomb ceramic heat preservation, and the honeycomb hole transversely docks the heater, is heated or the heat absorption is released heat and is stored heat by this inner wall when contacting the inner wall of honeycomb hole through reaction waste gas lateral flow.

4. The organic waste gas treatment device according to claim 3, wherein a waste gas flow through cavity for mixing and circulating the reaction waste gas is arranged between the honeycomb ceramic heat-insulating layer and the catalytic cabin, a pressure-relief explosion-proof piece connected with a control system is arranged in the waste gas flow through cavity, and the pressure-relief explosion-proof piece is arranged on the side surface of the catalytic chamber and is communicated with the outside for detecting the pressure of the waste gas in the waste gas flow through cavity to perform exhaust and pressure relief.

5. The organic waste gas treatment device according to claim 2, characterized by comprising:

is respectively connected with a first temperature measuring part, a second temperature measuring part and a third temperature measuring part of the control system,

the first temperature measuring part is arranged between the inner heat exchanger and the heater and used for measuring the current temperature of the preheated waste gas flowing to the heater and forming first temperature measuring information to be sent to the control system, and the control system controls the electric heating time and the heating temperature of the heater for controlling the temperature of the preheated waste gas according to the first temperature measuring information;

the second temperature measuring part is arranged between the heater and the catalytic cabin and is used for measuring the current temperature of the reaction waste gas flowing to the catalytic cabin, forming second temperature measuring information and sending the second temperature measuring information to the control system, and the control system controls the electric heating time and the heating temperature of the heater for controlling the temperature of the preheated waste gas according to the second temperature measuring information;

and the third temperature measuring part is arranged between the catalytic bin and the inner heat exchanger and used for measuring the current temperature of harmless hot gas flowing to the inner heat exchanger, forming third temperature measuring information and sending the third temperature measuring information to the control system, and the control system controls the electrifying time and the heating temperature of the inner heat exchanger for heating the preheated waste gas according to the third temperature measuring information.

6. The organic waste gas treatment device according to claim 2, characterized in that:

the inner heat exchanger is obliquely abutted against the inside of the catalytic chamber, one side of the inner heat exchanger is connected with a heat insulation plate, the heater is arranged between the heat insulation plate and the top surface of the catalytic chamber, the catalytic bin is abutted against the bottom surface of the catalytic chamber, and two sides of the catalytic bin are respectively communicated with the inner heat exchanger and the heater;

the side gas inlet and last gas vent have been seted up to the catalysis room, and interior heat exchanger is equipped with the side gas inlet of intercommunication and is used for receiving the waste gas import of no granule organic waste gas, the import of intercommunication waste gas and butt joint heater are used for exporting the waste gas export of preheating waste gas, butt joint catalysis storehouse is used for receiving harmless steam inlet, the harmless steam outlet of the harmless steam inlet of harmless steam of intercommunication, intercommunication harmless steam inlet and last gas vent are used for exporting catalysis tail gas.

7. The organic waste gas treatment device according to claim 1, characterized in that:

the outer heat exchanger is provided with an oxygen-free tail gas inlet used for being connected with the centrifugal fan, a harmless tail gas outlet used for being communicated between the oxygen-free tail gas inlet and the exhaust funnel, an outer heat exchanger air inlet used for being communicated with the outside, and a hot air outlet used for being communicated between the outer heat exchanger air inlet and the air feeder;

the harmless gas enters the outer heat exchanger through the oxygen-free tail gas inlet to perform heat exchange and temperature reduction to form standard-reaching tail gas, the tail gas is discharged to the outside through the harmless tail gas outlet through the exhaust funnel, the air inlet of the outer heat exchanger serves as a cold air inlet to enable the outside air to enter the outer heat exchanger to perform heat exchange and temperature rise to form oxygen-containing hot air, and the oxygen-containing hot air is conveyed back to the furnace through the hot air outlet through a waste heat backflow pipeline under the conveying power of the air feeder.

8. The organic waste gas treatment device according to claim 1, comprising: the dust removal flame arrester is communicated between the filter and the catalytic chamber through a pipeline and is connected with the control system, and a communication pipeline between the catalytic chamber and the filter is communicated or cut off through detecting the gas flow direction in the pipeline;

the dedusting flame arrester and the filter are provided with emptying valves, a switch valve is communicated between the filter and the organic waste gas inlet pipeline, and the switch valve and the emptying valves are respectively connected with a control system.

9. The organic waste gas treatment device according to claim 1, characterized in that:

the organic waste gas inlet pipeline outputs 30-40 ℃ organic waste gas, the 30-40 ℃ organic waste gas is heated into 250-300 ℃ preheated waste gas by an internal heat exchanger, the temperature of the preheated waste gas at 250-300 ℃ is controlled by a heater to form reaction waste gas at 300-350 ℃, the reaction waste gas at 300-350 ℃ is decomposed into harmless hot gas at 450-500 ℃ through catalytic combustion in the catalytic bin, the harmless hot gas at 450-500 ℃ is absorbed by the inner heat exchanger to form anaerobic tail gas at 220-300 ℃ and is conveyed to the outer heat exchanger by the centrifugal fan, the outer heat exchanger absorbs part of the heat of the anaerobic tail gas at 220-300 ℃ to make outside air into oxygen-containing hot air at 120-150 ℃ to convey the oxygen-containing hot air back to the furnace, and the catalytic tail gas after absorbing heat is discharged at 80-130 ℃.

10. The organic waste gas treatment device according to claim 1, characterized in that:

the air volume adjusting valve is communicated between the catalytic chamber and the centrifugal fan through a pipeline and is connected with the control system, the air volume adjusting valve is used for detecting the air pressure change of the harmless hot air in the pipeline and forming air pressure information to be sent to the control system, and the control system controls the air volume adjusting valve to adjust the sectional area of the communicated pipeline according to the air pressure information, so that the harmless hot air can keep stable air volume in the air pressure range of 50-200pa and flows to the external heat exchanger.