CN107890685B - Energy-saving environment-friendly circulating type waste gas treatment system applied to paint spraying and baking technology - Google Patents
Energy-saving environment-friendly circulating type waste gas treatment system applied to paint spraying and baking technology Download PDFInfo
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- CN107890685B CN107890685B CN201810005640.XA CN201810005640A CN107890685B CN 107890685 B CN107890685 B CN 107890685B CN 201810005640 A CN201810005640 A CN 201810005640A CN 107890685 B CN107890685 B CN 107890685B
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- 239000002912 waste gas Substances 0.000 title claims abstract description 171
- 238000005507 spraying Methods 0.000 title claims abstract description 93
- 239000003973 paint Substances 0.000 title claims abstract description 31
- 238000005516 engineering process Methods 0.000 title claims description 8
- 239000007789 gas Substances 0.000 claims abstract description 153
- 238000000034 method Methods 0.000 claims abstract description 24
- 230000008569 process Effects 0.000 claims abstract description 22
- 238000001179 sorption measurement Methods 0.000 claims description 151
- 238000004108 freeze drying Methods 0.000 claims description 91
- 238000003795 desorption Methods 0.000 claims description 69
- 238000002485 combustion reaction Methods 0.000 claims description 51
- 230000003197 catalytic effect Effects 0.000 claims description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- 238000001914 filtration Methods 0.000 claims description 29
- 239000007921 spray Substances 0.000 claims description 26
- 238000009423 ventilation Methods 0.000 claims description 18
- 230000001502 supplementing effect Effects 0.000 claims description 15
- 238000007710 freezing Methods 0.000 claims description 14
- 230000008014 freezing Effects 0.000 claims description 14
- 239000003595 mist Substances 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 11
- 239000003507 refrigerant Substances 0.000 claims description 8
- 238000004062 sedimentation Methods 0.000 claims description 5
- 229920000742 Cotton Polymers 0.000 claims description 4
- 239000004922 lacquer Substances 0.000 claims 1
- 238000004134 energy conservation Methods 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 125000004122 cyclic group Chemical group 0.000 abstract 2
- 238000001035 drying Methods 0.000 description 32
- 239000003463 adsorbent Substances 0.000 description 20
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 18
- 238000007084 catalytic combustion reaction Methods 0.000 description 18
- 230000009471 action Effects 0.000 description 14
- 238000010438 heat treatment Methods 0.000 description 14
- 230000017525 heat dissipation Effects 0.000 description 12
- 238000000354 decomposition reaction Methods 0.000 description 11
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- 239000001569 carbon dioxide Substances 0.000 description 9
- 229910002092 carbon dioxide Inorganic materials 0.000 description 9
- 238000009833 condensation Methods 0.000 description 9
- 230000005494 condensation Effects 0.000 description 9
- 238000001816 cooling Methods 0.000 description 9
- 239000012535 impurity Substances 0.000 description 7
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 7
- 238000004064 recycling Methods 0.000 description 7
- 238000005265 energy consumption Methods 0.000 description 4
- 238000007603 infrared drying Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 230000003134 recirculating effect Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000003421 catalytic decomposition reaction Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
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- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/265—Drying gases or vapours by refrigeration (condensation)
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0258—Other waste gases from painting equipments or paint drying installations
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Drying Of Solid Materials (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses an energy-saving environment-friendly circulating type waste gas treatment system applied to a paint spraying and baking process, which comprises a spraying chamber and a circulating type waste gas treatment unit, wherein the air inlet end of the circulating type waste gas treatment unit is communicated with the bottom of the spraying chamber, the air outlet end of the circulating type waste gas treatment unit is communicated with the top of the spraying chamber, the spraying chamber and the circulating type waste gas treatment unit form a circulating air channel, and the circulating type waste gas treatment unit pumps waste gas in the spraying chamber and returns the waste gas to the spraying chamber after the waste gas treatment. By adopting the structure, the invention can realize the cyclic treatment and cyclic utilization of the waste gas, thoroughly treat the waste gas, improve the resource utilization rate, and ensure that the content and total emission amount of the emitted organic volatile gas are far lower than those of the existing process, thereby realizing real energy conservation and environmental protection.
Description
Technical Field
The invention belongs to the technical field of waste gas treatment, and particularly relates to an energy-saving and environment-friendly circulating waste gas treatment system applied to a paint spraying and baking process, which is particularly used for realizing waste gas treatment and recycling in a circulating mode aiming at waste gas generated by the paint spraying and baking process, so as to achieve the purposes of energy saving and environment protection.
Background
At present, a plurality of processes possibly relate to the generation of waste gas, and how to effectively remove harmful components in the waste gas and reduce energy consumption at the same time so as to achieve the purposes of energy conservation and environmental protection is a subject of continuous research in various industries. Taking a paint spraying and baking technology as an example, the paint spraying and baking technology relates to furniture, aviation, automobiles, ships, containers, hardware electrical appliances, electronics industry and the like, the existing paint spraying and baking technology is generally finished in a paint baking room, and a large amount of waste gases such as paint mist, organic volatile gases and the like can be generated in the paint spraying and baking process.
The existing treatment of the waste gas in the baking finish house generally filters out the particulate matters in the waste gas in a filtering mode, but a lot of harmful components still remain to be directly discharged, and some waste gas in the baking finish house is directly discharged without any treatment, so that the surrounding living environment and the atmospheric environment are seriously affected.
The existing method also has the advantages that the waste gas is catalytically combusted, and then the combusted gas is directly discharged into the atmosphere to achieve the effect of purifying the waste gas, and the method can improve the waste gas, but continuously release the waste gas and continuously supplement air, so that not only is the waste of heat resources caused, but also the whole energy consumption is larger.
Disclosure of Invention
The invention aims to provide an energy-saving environment-friendly circulating waste gas treatment system for a paint spraying and baking process, solves the problems of extremely large environmental pollution and resource waste caused by incomplete and incomplete treatment of waste gas in the existing process, particularly in the paint spraying and baking process, truly realizes the emission of ultra-low concentration and ultra-low total amount, wherein the total emission amount is only 10% or less of the qualified emission of the conventional environment-friendly process, and recycles the heat energy to be abandoned, thereby saving energy and protecting environment.
The invention adopts the following technical scheme to realize the aim:
the energy-saving environment-friendly circulating type waste gas treatment system comprises a spraying chamber and a circulating type waste gas treatment unit, wherein the air inlet end of the circulating type waste gas treatment unit is communicated with the bottom of the spraying chamber, the air outlet end of the circulating type waste gas treatment unit is communicated with the top of the spraying chamber, the spraying chamber and the circulating type waste gas treatment unit form a circulating air channel, and waste gas in the spraying chamber is pumped away by the circulating type waste gas treatment unit and returned to the spraying chamber after being treated by the waste gas.
Further, as a preferred technical scheme, the circulating exhaust gas treatment unit comprises a front-stage circulating air channel and a rear-stage circulating air channel, wherein an air inlet of the front-stage circulating air channel is communicated with an air outlet at the bottom of the spraying chamber, an air outlet of the front-stage circulating air channel is communicated with an air inlet of the rear-stage circulating air channel and is switched on and off through an exhaust gas inlet circulating channel valve, an air outlet of the rear-stage circulating air channel is communicated with an air inlet at the top of the spraying chamber, a first filtering device, a first ventilation device and a first freeze drying device are sequentially arranged in the front-stage circulating air channel, an air inlet end of the first filtering device is communicated with an air outlet at the bottom of the spraying chamber, an air outlet end of the first filtering device is communicated with an air inlet end of the first freeze drying device, and the first ventilation device is arranged in the air channel between the first filtering device and the first freeze drying device;
The adsorption device comprises an adsorption total air inlet channel, an adsorption total air outlet channel, a desorption total air inlet channel and a desorption total air outlet channel, wherein the adsorption total air inlet channel of the adsorption device is communicated with an air outlet of a front-stage circulating air channel and is switched on and off through an exhaust gas inlet adsorption device total valve, and the adsorption total air outlet channel of the adsorption device is communicated with an air outlet of a rear-stage circulating air channel and is switched on and off through a clean air inlet circulating channel valve;
the device comprises a first air exchanging device, a catalytic heater, a catalytic burner, a heat exchange tube and a first freeze drying device, wherein the first air exchanging device is arranged at the front end of the catalytic heater;
Further, as the preferable technical scheme, the air inlet end of the first air exchanging device is communicated with the atmosphere through the first air compensating valve, and the adsorption total air outlet channel of the adsorption device is communicated with the atmosphere through the air outlet valve.
Further, as a preferable technical scheme, the freezing end and the heat dissipation end of the first freeze drying device are both positioned in the circulating air duct, and the freezing end is positioned before the heat dissipation end.
Further, as the preferred technical scheme, first freeze drying device includes freeze drying inner machine condensation dish, freeze drying outer machine cooling dish, condensate tank and sets up the automatic drain valve in the condensate tank bottom, freeze drying inner machine condensation dish and freeze drying outer machine cooling dish all set up in the circulation wind channel, and freeze drying inner machine condensation dish is located before the freeze drying outer machine cooling dish, the condensate tank is located the below of freeze drying inner machine condensation dish.
Further, as the preferable technical scheme, the device further comprises a desorption heater and a second air supplementing valve, wherein an air inlet of the desorption heater is communicated with the atmosphere through the second air supplementing valve, an air outlet of the desorption heater is communicated with a desorption total air inlet channel of the adsorption device, a desorption total air outlet channel of the adsorption device is communicated with an air inlet of the catalytic heater, and an air outlet of the catalytic heater is communicated with an air inlet of the catalytic combustor.
Further, as an optimized technical scheme, the device further comprises a heat exchanger, wherein a heat medium inlet of the heat exchanger is communicated with an air outlet of the catalytic combustor, a heat medium outlet of the heat exchanger is communicated with an air inlet of a heat exchange tube, an air outlet of the heat exchange tube is communicated with an air inlet of the second freeze drying device, a refrigerant inlet of the heat exchanger is communicated with the atmosphere through a second air supplementing valve, and a refrigerant outlet of the heat exchanger is communicated with an air inlet of the desorption heater.
Further, as a preferred technical scheme, the adsorption device comprises a plurality of adsorption units connected in parallel, and an adsorption air inlet, an adsorption air outlet, a desorption air inlet and a desorption air outlet of each adsorption unit are respectively communicated with the adsorption total air inlet channel, the adsorption total air outlet channel, the desorption total air inlet channel and the desorption total air outlet channel in a corresponding manner and are independently controlled through valves.
Further, as a preferable technical scheme, a second filtering device is arranged at the top of the spraying chamber.
Further, as a preferable technical scheme, the bottom of the spraying chamber is of a mesh structure, and a channel is arranged below the mesh structure and is communicated with the air inlet end of the first filtering device.
Further, as a preferable technical scheme, the bottom of the channel is paved with storage cotton for collecting sedimentation paint mist particles.
Compared with the prior art, the invention has the following advantages:
(1) The invention adopts a circulating waste gas treatment mode to realize the pumping and treatment of waste gas in the spraying chamber, changes the waste gas into clean gas and returns the clean gas to the spraying chamber, so as to realize the circulating treatment and recycling of the waste gas.
(2) According to the invention, the organic volatile gas in the waste gas is decomposed in a catalytic combustion mode to obtain high-temperature combustion waste gas, the high-temperature combustion waste gas is mainly carbon dioxide and water, then the high-temperature combustion waste gas is subjected to heat exchange with circulating gas to realize heat energy recycling, the heat-exchanged combustion waste gas is subjected to freeze drying treatment and is sent to an adsorption device to be subjected to final adsorption treatment, clean gas is finally discharged to the atmosphere, even if the previous catalytic combustion is not thoroughly decomposed, the organic volatile gas still remains in the combustion waste gas, the organic volatile gas can be completely removed as far as possible through the last adsorption, meanwhile, the effective recycling of heat energy is realized, the required heat is provided for drying, and the energy conservation and the environmental protection are realized.
(3) According to the invention, the freezing end and the heat dissipation end of the first freeze drying device are both arranged in the circulating air channel, and the freezing end is positioned in front of the heat dissipation end, so that under the condition that the water in the waste gas is removed by freezing, the heat dissipation end of the first freeze drying device is utilized to exchange heat with the low-temperature drying waste gas, the normal-temperature drying waste gas which is favorable for adsorption is obtained, and the effective utilization of heat energy is realized.
(4) According to the invention, after the high-temperature combustion waste gas is subjected to heat exchange through the heat exchanger and the heat exchange pipe in sequence, the utilization rate of heat energy is greatly improved, the desorption heating power consumption and the drying heating power consumption are reduced, the energy consumption is reduced, and the purpose of energy conservation is realized.
Drawings
FIG. 1 is a front view of an energy-saving and environmentally friendly recirculating exhaust gas treatment system in accordance with the present invention;
FIG. 2 is a rear view of the energy efficient and environmentally friendly recirculating exhaust gas treatment system of the present invention;
FIG. 3 is a right side view of the energy efficient and environmentally friendly recirculating exhaust gas treatment system of the present invention;
FIG. 4 is a schematic workflow diagram of the spraying phase of the present invention;
FIG. 5 is a schematic workflow diagram of the leveling stage of the present invention;
fig. 6 is a schematic workflow diagram of the drying stage of the present invention.
The names corresponding to the reference numerals are: 1. the spray booth comprises a spray booth body, 2, a mesh structure, 3, a channel, 4, a first filter device, 5, a first air supplementing valve, 6, a first air exchanging device, 7, a first freeze drying device, 8, a desorption heater, 9, an adsorption device, 10, a catalytic heater, 11, a catalytic burner, 12, a second filter device, 13, an infrared drying heating device, 14, an exhaust valve, 15, a foundation, 16, a second air exchanging device, 17, a heat exchanger, 18, a heat exchange tube, 19, a second air supplementing valve, 20, an exhaust gas inlet adsorption device total valve, 21, an exhaust gas inlet circulation channel valve, 22, a clean air inlet circulation channel valve, 23, a circulating gas combustion inlet valve, 24, a second freeze drying device, 25, a front circulation air channel, 26, a rear circulation air channel, 71, a freeze drying inner machine condensation plate, 72, a freeze drying outer machine heat dissipation plate, 73, a condensation water tank, 74, an automatic drain valve, 91, an adsorption total air inlet channel, 92, an adsorption total air outlet channel, 93, a desorption total air inlet channel, 94 and a desorption total channel.
Detailed Description
The present invention will be described in further detail with reference to examples, but embodiments of the present invention are not limited thereto.
Examples:
the energy-saving environment-friendly circulating type waste gas treatment system applied to the paint spraying and baking process comprises a spray booth 1 and a circulating type waste gas treatment unit, wherein the air inlet end of the circulating type waste gas treatment unit is communicated with the bottom of the spray booth 1, the air outlet end of the circulating type waste gas treatment unit is communicated with the top of the spray booth 1, the spray booth 1 and the circulating type waste gas treatment unit form a circulating air channel, waste gas in the spray booth 1 is pumped away by the circulating type waste gas treatment unit, and the waste gas is treated by the waste gas and then returned to the spray booth 1.
In the embodiment, the circulating type waste gas treatment unit is adopted to pump and treat the waste gas in the spraying chamber 1, and the waste gas is changed into clean gas and then returned to the spraying chamber 1, so that the circulating treatment and the recycling of the waste gas are realized.
It will be appreciated that the spray booth 1 is referred to as a booth (or booth) in general, and of course, the booth 1 may be referred to as a booth during different stages, for example, during spraying, the booth (or booth) may be referred to as a leveling booth during a leveling (drying) stage, and the booth (or booth) may be referred to as a drying booth during a drying stage. Of course, the spray booth 1 may be referred to as a spray booth in any of the working stages, and may be referred to as a spray booth in any of the working stages, since it may involve a period of time from painting, leveling, and drying of the workpiece, and the workpiece may not be moved.
As shown in fig. 1 to 6, in order to better implement the circulating exhaust gas treatment, the present embodiment may implement the exhaust gas treatment by adopting the following structure: the circulating type waste gas treatment unit specifically comprises a front-stage circulating air duct 25 and a rear-stage circulating air duct 26, wherein an air inlet of the front-stage circulating air duct 25 is communicated with an air outlet at the bottom of the spraying chamber 1, an air outlet of the front-stage circulating air duct 25 is communicated with an air inlet of the rear-stage circulating air duct 26 and is switched on and off through a waste gas inlet circulating channel valve 21, an air outlet of the rear-stage circulating air duct 26 is communicated with an air inlet at the top of the spraying chamber 1, a first filter device 4, a first ventilation device 6 and a first freeze drying device 7 are sequentially arranged in the front-stage circulating air duct 25, an air inlet end of the first filter device 4 is communicated with an air outlet at the bottom of the spraying chamber 1, an air outlet end of the first filter device 4 is communicated with an air inlet end of the first freeze drying device 7, and the first ventilation device 6 is arranged in an air duct between the first filter device 4 and the first freeze drying device 7; in addition, the adsorption device 9 is further included, the adsorption device 9 includes an adsorption total air inlet channel 91, an adsorption total air outlet channel 92, a desorption total air inlet channel 93 and a desorption total air outlet channel 94, the adsorption total air inlet channel 91 of the adsorption device 9 is communicated with the air outlet of the pre-stage circulating air channel 25 and is switched on and switched off by exhaust gas entering the adsorption device total valve 20, and the adsorption total air outlet channel 92 of the adsorption device 9 is communicated with the air outlet of the post-stage circulating air channel 26 and is switched on and switched off by clean air entering the circulating channel valve 22.
In the above structure, the front circulation air duct 25, the rear circulation air duct 26 and the spray coating chamber 1 form a complete circulation air duct, the first ventilation device 6 may be a general fan, and is used for pumping the exhaust gas in the spray coating chamber 1, under the action of the first ventilation device 6, the exhaust gas is pumped into the circulation air duct, the first filtering device 4 intercepts paint mist particles in the exhaust gas, the organic volatile gas in the exhaust gas enters the first freeze drying device 7 through the first filtering device 4, the exhaust gas and the freezing end of the first freeze drying device 7 complete heat exchange, saturated liquid water is separated out, and becomes low-temperature drying exhaust gas, the low-temperature drying exhaust gas exchanges heat with the heat dissipation end of the first freeze drying device 7 to obtain normal-temperature drying exhaust gas, at this time, the air outlet end of the first freeze drying device 7 is not communicated with the spray coating chamber 1 under the action of a valve, the air outlet end of the first freeze drying device 7 is communicated with the adsorption air inlet of the adsorption device 9 under the action of a valve, the normal temperature dry waste gas enters each adsorption unit in the adsorption device 9, the dry waste gas is adsorbed by the adsorbent to obtain clean gas, the organic volatile gas is adsorbed in the adsorption device 9, the clean gas enters the circulation channel valve 22 through the clean air into the rear circulation air channel 26 and finally returns into the spraying chamber 1, thereby the spraying chamber 1 realizes the circulation mode of flowing out the waste gas and flowing back the clean gas, and realizes the treatment of paint mist particles, moisture and the organic volatile gas in the circulation process, realizes the circulation treatment of the waste gas and the circulation utilization of the clean gas, compared with the traditional technology, the invention does not need to realize qualified discharge in a mode of increasing the gas discharge amount, and truly realizes the waste gas treatment, not only the discharged harmful substances are basically negligible compared with the traditional process, but also the total discharged amount is lower.
The embodiment further comprises a second ventilation device 16, a catalytic heater 10, a catalytic burner 11, a heat exchange tube 18 and a second freeze drying device 24, wherein the second ventilation device 16 is arranged at the front end of the catalytic heater 10, the air inlet of the catalytic heater 10 is communicated with the air outlet of a post-stage circulating air duct 26 and is switched through a circulating gas combustion inlet valve 23, the air outlet of the catalytic heater 10 is communicated with the air inlet of the catalytic burner 11, the air outlet of the catalytic burner 11 is communicated with the inlet of the heat exchange tube 18, the air outlet of the heat exchange tube 18 is communicated with the air inlet of the second freeze drying device 24, the heat exchange tube 18 is positioned in the post-stage circulating air duct 26, the air outlet of the heat exchange tube 18 is communicated with the air inlet of the second freeze drying device 24, and the air outlet of the second freeze drying device 24 is communicated with the adsorption total air inlet channel 91 of the adsorption device 9.
In this embodiment, when the drying stage is entered, since the temperature of the recycle gas is far higher than the normal temperature and the adsorption efficiency of the adsorbent at high temperature is low, it is obviously not suitable to use the adsorbent again to adsorb the organic volatile gas. In order to remove the organic volatile gas, catalytic combustion is added in this embodiment, specifically, the exhaust gas in the spraying chamber 1 is pumped into the circulating air duct through the first ventilation device 6, the first filtering device 4 intercepts paint mist particles in the exhaust gas, the organic volatile gas in the exhaust gas enters the first freeze-drying device 7 through the first filtering device 4, the exhaust gas and the freezing end of the first freeze-drying device 7 complete heat exchange, saturated liquid water is separated out, and dry exhaust gas is obtained, at this time, since the infrared drying heater 13 in the spraying chamber 1 is used for auxiliary heating and drying of the workpiece, direct adsorption of the exhaust gas is not easy, at this time, the exhaust gas enters the circulating channel valve 21 to be in an open state, the exhaust gas enters the adsorption device total valve 20 to be in a closed state, the exhaust gas does not enter the adsorption device 9 any more, but directly enters the post-stage circulating air duct 26, then returning to the spraying chamber 1 for circulation until the concentration of the organic volatile gas in the circulating gas reaches a certain value, at this time, the concentration of the waste gas has higher combustion value, the specific concentration value can be selected according to practical conditions, the circulating gas combustion inlet valve 23 is opened, part of the circulating gas in the later-stage circulating air duct 26 is pumped into the catalytic heater 10 to be heated to the temperature capable of being catalytically decomposed under the action of the second air exchange device 16, the heated circulating gas is sent into the catalytic burner 11 for catalytic combustion decomposition, high-temperature combustion waste gas with main components of carbon dioxide and water is obtained after decomposition, a large amount of heat is released, the high-temperature combustion waste gas enters the heat exchange tube 18 and exchanges heat with the circulating gas in the later-stage circulating air duct 26, and the circulating gas in the later-stage circulating air duct 26 returns to the spraying chamber 1 after heat exchange and temperature rise, heat is provided for drying the workpiece, and the high-temperature combustion waste gas in the heat exchange tube 18 is subjected to heat exchange and temperature reduction, is subjected to freeze drying by the second freeze drying device 24 to become normal-temperature combustion waste gas, and finally the normal-temperature combustion waste gas is adsorbed by the adsorption device 9 to reach the standard and is discharged to the atmosphere.
It will be appreciated that the heat exchange tube 18 achieves the most basic heat exchange, the heat exchange tube 18 and the post-stage circulating air duct 26 form a sleeve structure, the heat exchange tube 18 is internally provided with high-temperature combustion exhaust gas, the post-stage circulating air duct 26 is internally provided with circulating air, and the high-temperature combustion exhaust gas and the circulating air complete heat exchange in the flowing process. Of course, in this embodiment, the heat exchange tube 18 may be replaced by another heat exchanger, and after the heat exchange tube 18 is replaced by a heat exchanger, the heat medium inlet of the heat exchanger is fed with high-temperature combustion exhaust gas, the heat medium outlet is connected to the second freeze-drying device 24, the refrigerant inlet is fed with circulating gas, and the refrigerant outlet is connected to the top air inlet of the spray coating chamber 1.
The structure realizes the treatment of waste gas in the drying stage, the organic volatile gas in the waste gas is decomposed by adopting a catalytic combustion mode to obtain high-temperature combustion waste gas, the high-temperature combustion waste gas is mainly carbon dioxide and water, then the high-temperature combustion waste gas is subjected to heat exchange with circulating gas to realize heat energy recycling, the heat exchanged combustion waste gas is subjected to freeze drying treatment and is sent to an adsorption device 9 to be subjected to final adsorption treatment, clean gas is finally discharged into the atmosphere, even if the previous catalytic combustion decomposition is incomplete, the organic volatile gas still remains in the combustion waste gas, the organic volatile gas can be thoroughly removed through the last adsorption, the clean gas discharged into the atmosphere does not contain harmful substances, meanwhile, the effective recycling of heat energy is realized, the required heat is provided for drying, and the energy conservation and environmental protection are realized.
The amount of the above-mentioned partial circulation gas for catalytic combustion is preferably 1/20 to 1/10 of the total circulation gas flow, and if the circulation gas flow for 1 hour is 18000 cubic meters, the amount of the gas extracted for direct catalytic combustion is about 1000 cubic meters, that is, the amount of the gas to be replenished or discharged is not large every time relative to the total amount of the circulation gas. The content of organic volatile gas in the gas discharged after the treatment is far smaller than that of the existing technology, and the total discharge amount is lower.
In order to better realize the pressure balance in the spray chamber 1 and avoid excessive carbon dioxide accumulation in the spray chamber 1, as the combustion waste gas obtained through catalytic combustion decomposition is mainly carbon dioxide and water, the combustion waste gas is mainly carbon dioxide after being cooled and adsorbed and is directly discharged into the atmosphere, and in order to ensure the pressure balance in the spray chamber 1, outdoor air needs to be supplemented at the same time, so that the first air supplementing valve 5 and the exhaust valve 14 can be added, the air inlet end of the first air exchanging device 6 is communicated with the atmosphere through the first air supplementing valve 5, the adsorption total air outlet channel 92 of the adsorption device 9 is communicated with the atmosphere through the exhaust valve 14, the adsorption air outlet of the adsorption device 9 is communicated with the atmosphere through the exhaust valve 14, the outdoor air can be supplemented into the spray chamber 1 by opening the first air supplementing valve 5, and the clean gas can be discharged into the atmosphere by opening the exhaust valve 14.
In order to better realize heat energy utilization, in this embodiment, the freezing end and the heat dissipation end of the first freeze-drying device 7 are both located in the circulation air duct, and before the freezing end is located at the heat dissipation end, the waste gas is subjected to heat exchange with the heat dissipation end after the heat exchange at the freezing end, so that saturated liquid water is separated out from the waste gas through heat exchange between the waste gas and the freezing end to obtain dry waste gas, and meanwhile, the obtained waste gas is low-temperature dry waste gas, and at the moment, the obtained waste gas is subjected to heat exchange with the heat dissipation end of the first freeze-drying device 7 to change the low-temperature dry waste gas into normal-temperature dry waste gas so as to enter the adsorption device. Specifically, the first freeze-drying device 7 of the present embodiment includes a freeze-drying inner machine condensing disc 71, a freeze-drying outer machine cooling disc 72, a condensing water tank 73, and an automatic drain valve 74 disposed at the bottom of the condensing water tank 73, wherein the freeze-drying inner machine condensing disc 71 and the freeze-drying outer machine cooling disc 72 are both disposed in the circulation air duct, and the freeze-drying inner machine condensing disc 71 is located in front of the freeze-drying outer machine cooling disc 72, that is, the exhaust gas passes through the freeze-drying inner machine condensing disc 71 and then passes through the freeze-drying outer machine cooling disc 72, and the condensing water tank 73 is located below the freeze-drying inner machine condensing disc 71. Through such design, waste gas is cooled in the heat exchange of freeze drying inner machine condensing disc 71, saturated liquid water is separated out, and low temperature drying waste gas is obtained, saturated liquid water is collected in condensate tank 73 and finally discharged through automatic drain valve 74, and low temperature drying waste gas then continues to flow to freeze drying outer machine cooling disc 72, and becomes normal temperature drying waste gas after heat exchange with freeze drying outer machine cooling disc 72, under the condition that moisture in the waste gas is removed by freezing, heat exchange is carried out between the heat dissipation end of first freeze drying device 7 and low temperature drying waste gas, and the normal temperature drying waste gas favorable for adsorption is obtained, and effective utilization of heat energy is realized.
In order to realize the on-line desorption of the adsorbent, the embodiment introduces a desorption heater 8 and a second air compensating valve 19 on the basis of the above structure, wherein the air inlet of the desorption heater 8 is communicated with the atmosphere through the second air compensating valve 19, the air outlet of the desorption heater 8 is communicated with the desorption total air inlet channel 93 of the adsorption device 9, the desorption total air outlet channel 94 of the adsorption device 9 is communicated with the air inlet of the catalytic heater 10, and the air outlet of the catalytic heater 10 is communicated with the air inlet of the catalytic burner 11.
In this embodiment, the second air compensating valve 19 is opened, under the action of the ventilation device 16, outdoor clean air is extracted and heated in the desorption heater 8, the heated temperature is about 200 ℃, the heated waste gas is sent to one or more adsorption units needing to be desorbed in the adsorption device 9, the adsorption unit is used for desorbing and discharging high-concentration organic volatile gas under the action of hot air, then the high-concentration organic volatile gas is heated to a catalytic combustion temperature by the catalytic heater 10 and then sent into the catalytic combustor 11 for catalytic combustion and decomposition, high-temperature combustion waste gas with main components of carbon dioxide and water is obtained, the heat energy is recycled by heat exchange between the high-temperature combustion waste gas and circulating gas in the later-stage circulating air duct 26, the combustion waste gas after heat exchange is subjected to freeze drying treatment, liquid water is separated out, normal-temperature combustion waste gas is obtained, and finally the normal-temperature combustion waste gas is discharged to the atmosphere after the adsorption of residual organic volatile gas by the adsorption device reaches the standard. After the desorption of the adsorbent is completed, the outdoor clean air is pumped again, and the outdoor clean air is directly sent into the adsorption device 9 without heating, so that the adsorbent is quickly cooled to normal temperature, and then the adsorbent is regenerated and can be used for adsorption again. Because the directly extracted outdoor clean air participates in desorption, the invention can thoroughly realize the desorption of the adsorbent, thereby ensuring that the adsorbent has stronger adsorption capacity after desorption and regeneration.
In order to better realize heat energy utilization, the embodiment further comprises a heat exchanger 17, wherein a heat medium inlet of the heat exchanger 17 is communicated with an air outlet of the catalytic combustor 11, a heat medium outlet of the heat exchanger 17 is communicated with an air inlet of a heat exchange tube 18, an air outlet of the heat exchange tube 18 is communicated with an air inlet of a second freeze drying device 24, a refrigerant inlet of the heat exchanger 17 is communicated with the atmosphere through a second air compensating valve 19, and a refrigerant outlet of the heat exchanger 17 is communicated with an air inlet of the desorption heater 8. The high-temperature combustion waste gas obtained by catalytic combustion decomposition of the desorbed high-concentration organic volatile gas is subjected to heat exchange with the outdoor clean air to be desorbed, the outdoor clean air to be desorbed can be directly sent to a corresponding adsorption unit to be desorbed in the adsorption device 9 for desorption after heat exchange and temperature rise, and when the high-temperature combustion waste gas and the outdoor clean air to be desorbed are high in heat exchange efficiency, the desorption temperature can be reached basically without the need of a desorption heater 8 for heating the outdoor clean air to be desorbed again or only by auxiliary heating of the desorption heater 8, and then the desorption temperature can be reached and sent to the adsorption unit to be desorbed in the adsorption device 9; the high-temperature combustion waste gas exchanges heat through the heat exchanger 17 and then enters the heat exchange tube 18 to exchange heat with the circulating gas in the later-stage circulating air duct 26 to provide heat for workpiece drying, that is, the heat exchanger 17 is introduced, so that the heat energy utilization rate of the high-temperature combustion waste gas is further improved under the condition of realizing on-line desorption, the desorption heating power consumption can be reduced, the energy consumption is reduced, and the energy saving purpose is realized.
In this embodiment, in order to meet different adsorption scales and realize that adsorption and desorption are not stopped at the same time, the adsorption device 9 may be designed as a plurality of parallel adsorption units, and the parallel adsorption units are respectively and independently adsorbed and desorbed, and the adsorption air inlet, the adsorption air outlet, the desorption air inlet and the desorption air outlet of each adsorption unit are respectively and correspondingly communicated with the adsorption total air inlet 91, the adsorption total air outlet 92, the desorption total air inlet 93 and the desorption total air outlet 94 and are independently controlled by valves, that is, the waste gas to be adsorbed enters the adsorption total air inlet 91 first, then the waste gas is controlled by valves to enter the different adsorption units respectively, and in the same way, the hot air to be desorbed enters the desorption total air inlet 93 first, and then the hot air enters the corresponding adsorption units through valves. Taking two adsorption units as an example, the waste gas enters an adsorption device, the waste gas enters adsorption beds in the adsorption units from the bottoms of the two adsorption units respectively, the adsorbent of the adsorption beds adsorbs organic volatile gas in the waste gas, the non-adsorbed harmless part of the waste gas smoothly flows out of the top of the adsorption unit, the adsorbent gradually tends to be saturated along with the continuous progress of adsorption reaction, one adsorption unit with higher saturation degree is selected to start desorption before the adsorbent is unsaturated, namely the bottom of the adsorption unit is not allowed to enter the waste gas, meanwhile, the top of the same adsorption unit is filled with desorption hot air, the adsorbent starts to desorb, the organic volatile gas is separated from the adsorbent, and the separated organic volatile gas with relatively high concentration flows out of the bottom of the adsorption unit and then enters a catalytic heating device to perform subsequent catalytic combustion decomposition; the adsorbent is regenerated after being cooled after desorption, then adsorption can be started, and the other adsorption unit can start desorption, so that the adsorption is uninterrupted.
According to the embodiment, different gas flow treatment requirements are met through the plurality of adsorption units which are connected in parallel, the adsorption units can conduct off-line desorption and also can conduct on-line desorption, and different requirements of customers can be met.
In order to prevent the circulating gas from bringing back impurities such as particulate matters into the spraying chamber 1, in this embodiment, a second filter device 12 may be further disposed at the top of the spraying chamber 1, where the second filter device 12 mainly plays a role in intercepting particulate matters, the second filter device 12 may be a general filter plate structure, and similarly, the first filter device 4 may also adopt an existing filter structure for intercepting particulate matters.
In order to facilitate that waste gas is smoothly and thoroughly pumped away, the bottom of the spraying chamber 1 can be designed into a mesh structure 2, a channel 3 is arranged below the mesh structure 2, the channel is positioned between the spraying chamber 1 and a foundation 15, the channel 3 is used as a suspension layer and is communicated with the air inlet end of the first filtering device 4, under the action of the first ventilation equipment 6, the waste gas in the spraying chamber 1 enters the channel through the mesh structure 2 and moves towards the first filtering device 4 along the channel 3, the channel 3 can play a certain sedimentation and collection role, high-density impurities in the waste gas are sedimented in the channel 3, such as partial paint mist particles and the like, and the first filtering device 4 plays a role in further interception. In order to better realize sedimentation collection, the embodiment can also lay the storage cotton used for collecting sedimentation paint mist particles at the bottom of the channel 3, and the particulate matter impurities entering the channel 3 are settled on the storage cotton, so as to realize pretreatment of the particulate matter impurities.
It will be appreciated that the first ventilation device 6 and the second ventilation device 16 may be general circulation fans, preferably variable frequency fans, to achieve circulation of gas and extraction of gas.
It will be appreciated that, in order to enhance the safety of the whole processing system, a safety net may be added at the position of the exhaust port where the exhaust valve 14 is located to prevent foreign matters from entering, and a filtering device is arranged at the positions of the air compensating ports where the first air compensating valve 5 and the second air compensating valve 19 are located to prevent foreign matters such as external particulate matters from entering to pollute the workpiece.
The working principle of the invention is further described below with reference to specific exhaust gas treatment processes, and the working principle can realize exhaust gas treatment in three stages of spraying, leveling (or airing) and drying, wherein the specific treatment processes are as follows:
fig. 1 and 2: the waste gas inlet adsorption device main valve 20 is used for realizing the on-off control of the circulating waste gas and the adsorption device, the waste gas inlet circulating channel valve 21 is used for circulating control of the circulating waste gas, the clean air inlet circulating channel valve 22 is used for controlling whether the clean air adsorbed by the adsorption device is mixed into the circulating gas, and the circulating gas combustion inlet valve 23 is used for controlling whether part of the circulating gas is extracted for catalytic combustion decomposition; the exhaust gas inlet adsorption unit valve 91 is used for controlling whether each adsorption unit performs exhaust gas adsorption, and the clean air collecting pipe 92 is used for collecting the clean air discharged from each adsorption unit and then discharging the clean air into the atmosphere or mixing the clean air into the circulating gas; the desorption gas inlet valve 93 is used to control whether each adsorption unit is desorbed or not; the desorption exhaust gas collection pipe 94 is used for collecting the high-concentration exhaust gas obtained by desorption of each adsorption unit, and then sending the high-concentration exhaust gas to the catalytic heater 10 and the catalytic burner 11 for catalytic combustion decomposition.
And (3) spraying: the stage does not involve heating and baking, so that waste gas can be directly adsorbed; as shown in fig. 1 and 2, the exhaust gas flows out from the bottom air outlet of the spray booth 1 under the action of the first ventilation device 6, returns to the spray booth 1 after passing through the pre-circulation duct 25 and the adsorption device 9, and is circulated, the exhaust gas in the spray booth 1 is continuously taken away and is continuously adsorbed by the adsorption device 9, specifically, the exhaust gas in the spray booth 1 enters the trench 3 and moves along the trench 3 towards the first filtering device 4, the high-density impurities in the exhaust gas are settled in the trench 3, the first filtering device 4 intercepts paint mist particles in the exhaust gas, the organic volatile gas in the exhaust gas passes through the first filtering device 4 and enters the first freeze-drying device 7, the exhaust gas exchanges heat in the freeze-drying inner machine condensation tray 71 of the first freeze-drying device 7, saturated liquid water is separated out, and low-temperature dry exhaust gas is obtained, the saturated liquid water is collected in the condensation water tank 73 and finally discharged through the automatic drain valve 74, the low-temperature freeze-drying exhaust gas continues to flow to the outer machine tray 72, and exchanges heat with the freeze-drying outer machine, the exhaust gas is not absorbed by the air suction device, and then enters the air conditioner 1 through the air circulation duct 9, and the air conditioner 1 is directly discharged to the air conditioner 1 after passing through the air circulation duct, the air conditioner 1, and the air is cooled down through the air circulation device, and the air conditioner is exhausted to the air duct is directly sucked to the air cleaner 1, and the air cleaner. When fresh air needs to be supplemented into the spraying chamber 1, the first air supplementing valve 5 can be opened, and when air needs to be discharged from the spraying chamber 1, the exhaust valve can be opened, and clean air is discharged.
Leveling stage: the stage is basically the same as the spraying stage, as shown in fig. 1 and 2, the waste gas flows out from the bottom air outlet of the spraying chamber 1 under the action of the first air exchange device 6, returns to the spraying chamber 1 after passing through the pre-circulation air duct 25 and the adsorption device 9, circulates in this way, the waste gas in the spraying chamber 1 is continuously taken away and is continuously adsorbed by the adsorption device 9, specifically, the waste gas in the spraying chamber 1 enters the channel 3 and moves along the channel 3 towards the first filtering device 4, the high-density impurities in the waste gas are settled in the channel 3, the first filtering device 4 intercepts paint mist particles in the waste gas, the organic volatile gas in the waste gas enters the first freeze-drying device 7 through the first filtering device 4, the waste gas exchanges heat and is cooled in the freeze-drying internal machine condensation plate 71 of the first freeze-drying device 7, and saturated liquid water is separated out, and get the low-temperature dry waste gas, the saturated liquid water is gathered in the condensed water tank 73, and finally discharged through the automatic drain valve 74, and the low-temperature dry waste gas continues to flow to the freeze-drying outer machine heat-radiating plate 72, and changes into the normal-temperature dry waste gas after exchanging heat with the freeze-drying outer machine heat-radiating plate 72, then the normal-temperature dry waste gas does not enter the post-circulation air duct 26, but directly enters the corresponding adsorption unit in the adsorption device 9, the normal-temperature dry waste gas is absorbed by the adsorbent of the adsorption unit to get the clean gas, the organic volatile gas is adsorbed in the adsorption device 9, the clean gas is not discharged to the atmosphere through the exhaust valve 14, but returns to the spray chamber 1 under the action of the first air exchange device 6, thus the circulation of the waste gas outflow and the clean gas flow back is realized in the spray chamber 1, until the exhaust gases in the spray booth 1 are treated clean. When fresh air needs to be supplemented into the spraying chamber 1, the first air supplementing valve 5 can be opened, and when air needs to be discharged from the spraying chamber 1, the exhaust valve can be opened, and clean air is discharged.
And (3) drying: the stage is partially the same as the spraying stage and the leveling stage, as shown in fig. 1 and 2, the waste gas flows out from the bottom air outlet of the spraying chamber 1 under the action of the first ventilation equipment 6, and returns to the spraying chamber 1 after passing through the front-stage circulating air duct 25 and the rear-stage circulating air duct 26 to serve as an internal circulating channel; specifically, the waste gas in the spraying chamber 1 enters the channel 3 and moves along the channel 3 towards the first filtering device 4, the high-density impurities in the waste gas are settled in the channel 3, the first filtering device 4 intercepts paint mist particles in the waste gas, the organic volatile gas in the waste gas enters the first freeze-drying device 7 through the first filtering device 4, the waste gas exchanges heat and cools in the freeze-drying inner machine condensing disc 71 of the first freeze-drying device 7, saturated liquid water is separated out, low-temperature drying waste gas is obtained, the saturated liquid water is collected in the condensing water tank 73 and finally discharged through the automatic drain valve 74, the low-temperature drying waste gas continuously flows to the freeze-drying outer machine radiating disc 72 and exchanges heat with the freeze-drying outer machine radiating disc 72 to become drying waste gas, and the infrared drying heater 13 performs auxiliary drying on workpieces at the moment, therefore, the temperature in the spraying chamber 1 and the circulating air duct is far higher than the normal temperature, the exhaust gas generated in the drying stage cannot be directly adsorbed obviously, at this time, the exhaust gas enters the circulating channel valve 21 to be in an open state, the exhaust gas enters the adsorption device main valve 20 to be in a closed state, the exhaust gas does not enter the adsorption device 9 any more, but directly enters the rear-stage circulating air duct 26, and then returns to the spraying chamber 1 for circulation until the concentration of the organic volatile gas in the circulating gas reaches a certain value and is lower than the lower limit of the explosion concentration by 25%, the concentration of the exhaust gas has higher combustion value at this time, the specific concentration value can be selected according to the actual situation, the circulating gas combustion inlet valve 23 is opened, part of the circulating gas in the rear-stage circulating air duct 26 is pumped into the catalytic heater 10 to be heated to the catalytic decomposition temperature under the action of the second ventilation device 16, then the heated circulating gas is sent into a catalytic combustor 11 for catalytic combustion decomposition, high-temperature combustion waste gas with main components of carbon dioxide and water is obtained through decomposition, a large amount of heat is released, the high-temperature combustion waste gas exchanges heat with the circulating gas in a later-stage circulating air duct 26 and the high-temperature combustion waste gas in a heat exchange tube 18, the circulating gas in the later-stage circulating air duct 26 returns into a spraying chamber 1 after heat exchange and temperature rise, heat is provided for drying a workpiece, the high-temperature combustion waste gas in the heat exchange tube 18 is subjected to heat exchange and temperature reduction, and then is subjected to freeze drying by a second freeze drying device 24 to become normal-temperature combustion waste gas, and finally the normal-temperature combustion waste gas is adsorbed by an adsorption device 9, and the residual organic volatile gas reaches the standard and is discharged into the atmosphere; while in the desorption phase: the second air supplementing valve 19 is opened, outdoor clean air is pumped into the desorption heater 8 to be heated under the action of the air exchange equipment 16, the heated temperature is about 200 ℃, the heated waste gas is sent into one or more adsorption units needing to be desorbed in the adsorption device 9, the adsorption units are used for desorbing under the action of hot air, high-concentration organic volatile gas is discharged, then the high-concentration organic volatile gas is heated to a catalytic combustion temperature through the catalytic heater 10 and then sent into the catalytic combustor 11 to be subjected to catalytic combustion decomposition, high-temperature combustion waste gas with main components of carbon dioxide and water is obtained, the high-temperature combustion waste gas firstly exchanges heat with the outdoor clean air to be desorbed, the heat exchange is carried out on the high-temperature combustion waste gas, then the heat exchange is carried out on the high-temperature combustion waste gas through the heat exchange pipe 18, the heat exchange is carried out on the circulating gas in the later-stage circulating air duct 26, the circulating gas returns into the spray coating chamber 1 after the heat exchange and the temperature is raised, heat is provided for drying of workpieces, the high-temperature combustion waste gas is subjected to the heat exchange and the temperature reduction through the second freeze drying device 24, the high-concentration organic volatile gas is changed into combustion waste gas, and finally the combustion waste gas is adsorbed by the adsorption device 9 and reaches the residual volatile gas to reach the normal temperature and is discharged to the atmosphere. After the desorption of the adsorbent is completed, the outdoor clean air is pumped again, and the outdoor clean air is directly sent into an adsorption unit in the adsorption device 9 which just completes the desorption without heating, so that the adsorbent is quickly cooled to the normal temperature, the regeneration of the adsorbent is realized, and then the adsorbent can be used for adsorption again.
It will be appreciated that, since the operator is present in the spray booth 1 during the spraying stage, in order to ensure that the operator's breath is not affected, the present embodiment may provide the operator with a separate breathing air supply device to meet the operator's demand for fresh air, oxygen.
In the invention, in order to ensure the safety of the system, various metering detection devices can be arranged in the spraying chamber 1 and used for detecting the content of air particles, the oxygen content, the temperature, the humidity, the wind speed, the pressure intensity, the concentration of organic volatile gases and the like in real time, when the oxygen content is too low, an air supplementing valve is automatically opened, after the temperature is too high, a heating device (a catalytic heater, a desorption heater, an infrared drying heater and the like) is automatically closed, and meanwhile, a plurality of safety valves are additionally arranged, and when the pressure intensity and the concentration of waste gas in the spraying chamber or a circulating pipeline exceed the safety limit values, the safety valves are automatically opened; in addition, the heating device is linked with the fan, the water spraying fire extinguishing system is arranged in the adsorption device, and the fire-retarding valve, the spark detector and the like are additionally arranged in the pipeline system. The metering detection device, the sensor and the heating device can be automatically controlled by the control equipment.
It can be understood that the above-mentioned various measurement detection devices, sensors, water spray fire extinguishing systems, pipeline systems, fire-retarding valves and spark detectors are all of the existing structures, and the connection relation and specific positions of the various functional devices are the conventional choices for realizing safe production and automatic control for the skilled person, so that the skilled person can realize the purposes of the invention and obtain the corresponding technical effects without the need of creative labor on the basis of knowing the purposes of the invention and the structures disclosed by the invention.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent variation, etc. of the above embodiment according to the technical matter of the present invention fall within the scope of the present invention.
Claims (7)
1. Energy-concerving and environment-protective circulation formula exhaust-gas treatment system for lacquer technology of spraying paint, its characterized in that: comprises a spraying chamber (1) and a circulating waste gas treatment unit, wherein the air inlet end of the circulating waste gas treatment unit is communicated with the bottom of the spraying chamber (1), the air outlet end of the circulating waste gas treatment unit is communicated with the top of the spraying chamber (1), the spraying chamber (1) and the circulating waste gas treatment unit form a circulating air duct, the circulating waste gas treatment unit pumps waste gas in the spraying chamber (1) away, and the waste gas is treated and returned to the spraying chamber (1),
the circulating exhaust gas treatment unit comprises a front-stage circulating air duct (25) and a rear-stage circulating air duct (26), wherein an air inlet of the front-stage circulating air duct (25) is communicated with an air outlet at the bottom of the spraying chamber (1), an air outlet of the front-stage circulating air duct (25) is communicated with an air inlet of the rear-stage circulating air duct (26) and is communicated with an air inlet at the top of the spraying chamber (1) through exhaust gas entering a circulating channel valve (21), a first filtering device (4), a first ventilation device (6) and a first freeze-drying device (7) are sequentially arranged in the front-stage circulating air duct (25), an air inlet end of the first filtering device (4) is communicated with an air outlet at the bottom of the spraying chamber (1), an air outlet end of the first filtering device (4) is communicated with an air inlet end of the first freeze-drying device (7), and the first ventilation device (6) is arranged in the air duct between the first filtering device (4) and the first freeze-drying device (7);
The adsorption device (9) comprises an adsorption total air inlet channel (91), an adsorption total air outlet channel (92), a desorption total air inlet channel (93) and a desorption total air outlet channel (94), wherein the adsorption total air inlet channel (91) of the adsorption device (9) is communicated with an air outlet of a front-stage circulating air channel (25) and is switched on and off through an exhaust gas inlet adsorption device total valve (20), and the adsorption total air outlet channel (92) of the adsorption device (9) is communicated with an air outlet of a rear-stage circulating air channel (26) and is switched on and off through a clean air inlet circulating channel valve (22);
the device comprises a first air exchanging device (16), a catalytic heater (10), a catalytic burner (11), a heat exchange tube (18) and a first freeze drying device (24), wherein the first air exchanging device (16) is arranged at the front end of the catalytic heater (10), an air inlet of the catalytic heater (10) is communicated with an air outlet of a rear circulating air channel (26) and is switched on and off through a circulating air combustion inlet valve (23), an air outlet of the catalytic heater (10) is communicated with an air inlet of the catalytic burner (11), an air outlet of the catalytic burner (11) is communicated with an inlet of the heat exchange tube (18), an air outlet of the heat exchange tube (18) is communicated with an air inlet of the first freeze drying device (24), the heat exchange tube (18) is positioned in the rear circulating air channel (26), and an air outlet of the first freeze drying device (24) is communicated with an adsorption total (91) of an adsorption device (9);
The air inlet end of the first air exchanging device (6) is communicated with the atmosphere through the first air compensating valve (5), and the adsorption total air outlet channel (92) of the adsorption device (9) is communicated with the atmosphere through the air outlet valve (14);
the device comprises an adsorption device (9), and is characterized by further comprising a desorption heater (8) and a second air supplementing valve (19), wherein an air inlet of the desorption heater (8) is communicated with the atmosphere through the second air supplementing valve (19), an air outlet of the desorption heater (8) is communicated with a desorption total air inlet channel (93) of the adsorption device (9), a desorption total air outlet channel (94) of the adsorption device (9) is communicated with an air inlet of a catalytic heater (10), and an air outlet of the catalytic heater (10) is communicated with an air inlet of a catalytic burner (11);
the device comprises a catalytic combustor (11), and is characterized by further comprising a heat exchanger (17), wherein a heat medium inlet of the heat exchanger (17) is communicated with an air outlet of the catalytic combustor (11), a heat medium outlet of the heat exchanger (17) is communicated with an air inlet of a heat exchange tube (18), an air outlet of the heat exchange tube (18) is communicated with an air inlet of a second freeze drying device (24), a refrigerant inlet of the heat exchanger (17) is communicated with the atmosphere through a second air supplementing valve (19), and a refrigerant outlet of the heat exchanger (17) is communicated with an air inlet of a desorption heater (8).
2. The energy-saving and environment-friendly circulating exhaust gas treatment system applied to paint spraying and baking processes as claimed in claim 1, wherein: the freezing end and the radiating end of the first freeze drying device (7) are both positioned in the circulating air duct, and the freezing end is positioned in front of the radiating end.
3. The energy-saving and environment-friendly circulating exhaust gas treatment system applied to paint spraying and baking processes as claimed in claim 2, wherein: the first freeze drying device (7) comprises a freeze drying inner machine condensing disc (71), a freeze drying outer machine radiating disc (72), a condensing water tank (73) and an automatic drain valve (74) arranged at the bottom of the condensing water tank (73), wherein the freeze drying inner machine condensing disc (71) and the freeze drying outer machine radiating disc (72) are arranged in a circulating air channel, the freeze drying inner machine condensing disc (71) is positioned in front of the freeze drying outer machine radiating disc (72), and the condensing water tank (73) is positioned below the freeze drying inner machine condensing disc (71).
4. An energy-saving and environment-friendly circulating exhaust gas treatment system applied to paint spraying and baking processes according to any one of claims 1-3, wherein: the adsorption device (9) comprises a plurality of adsorption units which are connected in parallel, wherein an adsorption air inlet, an adsorption air outlet, a desorption air inlet and a desorption air outlet of each adsorption unit are respectively communicated with an adsorption total air inlet channel (91), an adsorption total air outlet channel (92), a desorption total air inlet channel (93) and a desorption total air outlet channel (94) and are independently controlled through valves.
5. The energy-saving and environment-friendly circulating exhaust gas treatment system applied to paint spraying and baking processes as claimed in claim 1, wherein: the top of the spraying chamber (1) is provided with a second filtering device (12).
6. The energy-saving and environment-friendly circulating exhaust gas treatment system applied to paint spraying and baking processes as claimed in claim 1, wherein: the bottom of spray booth (1) is mesh structure (2), the below of mesh structure (2) is provided with channel (3), channel (3) with the inlet end intercommunication of first filter equipment (4).
7. The energy-saving and environment-friendly circulating exhaust gas treatment system applied to paint spraying and baking processes as claimed in claim 6, wherein: the bottom of the channel (3) is paved with storage cotton for collecting sedimentation paint mist particles.
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| CN201810005640.XA CN107890685B (en) | 2018-01-03 | 2018-01-03 | Energy-saving environment-friendly circulating type waste gas treatment system applied to paint spraying and baking technology |
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| CN108620269B (en) * | 2018-04-12 | 2020-12-15 | 惠州市欣欣家具有限公司 | Environment-friendly efficient paint spraying equipment |
| CN109465165A (en) * | 2018-08-30 | 2019-03-15 | 芜湖鸣人汽车维修服务有限公司 | A kind of finish-baking room for automobile |
| CN109173575A (en) * | 2018-09-14 | 2019-01-11 | 铜陵市天峰汽车维修服务有限责任公司 | A kind of air purifier for automotive lacquer room |
| CN110013940A (en) * | 2019-05-16 | 2019-07-16 | 厦门宇春机电设备有限公司 | A kind of environmentally-friendly dry circulation paint spray booth |
| CN114345063A (en) * | 2021-12-10 | 2022-04-15 | 宁波立成涂装技术有限公司 | Paint spray booth waste gas treatment process |
| CN114984678A (en) * | 2022-06-02 | 2022-09-02 | 汪凤銮 | Waste gas collecting and treating device |
| CN117101300B (en) * | 2023-08-25 | 2024-05-24 | 深圳市睿维盛环保科技有限公司 | VOCs exhaust treatment system |
| CN117427489A (en) * | 2023-12-08 | 2024-01-23 | 汉寿潇汉新材料科技有限公司 | Waste gas treatment system in water-based paint production process |
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| CN107890685A (en) | 2018-04-10 |
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