CN108371876B - Catalytic oxidation device and method for efficiently treating VOCs organic waste gas - Google Patents
Catalytic oxidation device and method for efficiently treating VOCs organic waste gas Download PDFInfo
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- CN108371876B CN108371876B CN201810290138.8A CN201810290138A CN108371876B CN 108371876 B CN108371876 B CN 108371876B CN 201810290138 A CN201810290138 A CN 201810290138A CN 108371876 B CN108371876 B CN 108371876B
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- 239000007789 gas Substances 0.000 title claims abstract description 91
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 78
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 46
- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 41
- 230000003647 oxidation Effects 0.000 title claims abstract description 32
- 239000010815 organic waste Substances 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title abstract description 14
- 239000003054 catalyst Substances 0.000 claims abstract description 110
- 238000009826 distribution Methods 0.000 claims description 25
- 238000001816 cooling Methods 0.000 claims description 24
- 239000000178 monomer Substances 0.000 claims description 24
- 238000002156 mixing Methods 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 10
- 238000003795 desorption Methods 0.000 claims description 4
- 238000001179 sorption measurement Methods 0.000 claims description 4
- 239000011810 insulating material Substances 0.000 claims description 3
- 239000002912 waste gas Substances 0.000 abstract description 18
- 238000006243 chemical reaction Methods 0.000 abstract description 9
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 5
- 238000000746 purification Methods 0.000 abstract description 3
- 238000007084 catalytic combustion reaction Methods 0.000 description 5
- 239000000428 dust Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 239000002808 molecular sieve Substances 0.000 description 4
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
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- 238000009434 installation Methods 0.000 description 3
- 230000001502 supplementing effect Effects 0.000 description 3
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 239000012717 electrostatic precipitator Substances 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
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- 238000000576 coating method Methods 0.000 description 1
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- 238000005260 corrosion Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
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Classifications
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- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8696—Controlling the catalytic process
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8678—Removing components of undefined structure
- B01D53/8687—Organic components
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/88—Handling or mounting catalysts
-
- 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
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention relates to a catalytic oxidation device and a catalytic oxidation method for efficiently treating VOCs organic waste gas. The catalytic oxidation device for efficiently treating VOCs organic waste gas comprises a dry filter, a flame arrester, a heat exchanger, a heater and a catalytic-oxidation reactor, wherein the dry filter is connected with the flame arrester, the flame arrester is connected with a cold end inlet of the heat exchanger, a cold end outlet of the heat exchanger is connected with the heater, the heater is connected with the catalytic-oxidation reactor, the catalytic-oxidation reactor is connected with a hot end inlet of the heat exchanger, and a hot end outlet of the heat exchanger is connected with a chimney. The invention improves the structure of the catalytic-oxidation reactor, reduces the energy consumption while improving the reliability of the device, ensures the utilization rate of the catalyst and the purification efficiency of the device to the waste gas, and ensures that the concentration of the organic waste gas of the inlet VOCs is 0.5-6g/m in the running process of the device 3 Reaction space velocity sv=5k—30K h ‑1 The device can remove VOCs with efficiency up to 99.5%.
Description
Technical Field
The invention relates to a catalytic oxidation device and a catalytic oxidation method for efficiently treating VOCs organic waste gas.
Background
Volatile Organic Compounds (VOCs) are secondary SO 2 、NO x Besides, the important pollutant brings heavy pressure to the environment and life. The VOCs in China have the characteristics of large emission, complex sources and the like, and the industries of coating, printing, chemical industry and the like sequentially promulgate VOCs emission standards to reduce the VOCs emission. Catalytic oxidation is an effective means for removing VOCs, and oxidizes VOCs into harmless H under the action of heating and catalysts 2 O and CO 2 。
The core of the catalytic-oxidation is a CO (Catalytic Oxidation) reactor and a catalyst, the treatment efficiency and the energy consumption of the system are directly determined, a conventional CO reactor and catalyst units are piled up to form a catalyst bed, and the catalyst bed adopts a multi-layer arrangement. The reactor has the defects of low efficiency, complex structure, large volume, inconvenient installation and replacement of the catalyst, poor uniformity of air flow and temperature distribution and the like, and has the defects of poor tightness, easiness in forming short flow and low treatment efficiency of the CO reactor. To improve plant removal efficiency, optimizing airflow, temperature distribution, and recovering thermal energy, the prior art discloses methods and strategies.
Patent CN 204285486 discloses a device for treating waste gas of setting machine, which combines an electrostatic precipitator and a catalytic module, wherein the electrostatic precipitator removes particles in the waste gas, the core unit catalytic oxidation module removes VOCs in the waste gas, the honeycomb catalyst is assembled into a catalyst bed, the reactor structure is complex, and the uniformity of gas distribution is poor. Patent CN205461796 discloses a device for efficiently treating organic waste gas VOCs, a catalytic-combustion method is adopted, a catalyst filler layer is arranged inside a reactor, nano-holes with different filling levels and rare earth molecular sieve high-efficiency catalysts are filled, and the purification efficiency of the system is more than 99%. However, the granular catalyst causes increased resistance, is unfavorable for air flow distribution, is easy to form short flow and increase local load, and in addition, the reaction heat is not easy to diffuse, the temperature of a catalyst bed is easy to rise, and the catalyst is further sintered and deactivated. CN 107583409 discloses a novel VOC treatment system, which adopts zeolite molecular sieve runner+catalytic combustion mode, zeolite molecular sieve runner is adsorption-concentration section, catalytic-combustion reactor comprises catalytic plate and heat exchanger, catalytic plate sets 3-5 layers, catalytic plate outlet gas enters heat exchanger for heating molecular sieve runner desorption gas, so as to reduce energy consumption. However, there is uneven airflow distribution, and the adaptability to fluctuations is poor. CN 107497291 discloses a combustion type VOC treatment device, which integrates adsorption, preheating and catalytic combustion, and mainly uses heat generated by exhaust gas combustion to preheat exhaust gas entering a catalytic combustion system, thereby reducing energy consumption and not optimizing a reactor.
The existing catalytic-oxidation reactor for VOCs treatment is characterized in that the reactor is a cuboid, a catalytic bed is assembled by stacking catalyst monomers, and the reactor is required to be provided with complex reducing joints, switching valves and the like, so that the manufacturing cost is high. In addition, there are large equipment volume, uneven gas flow distribution, complex reactor structure, inconvenient catalyst installation, regeneration and replacement, and the like.
Disclosure of Invention
Aiming at the problems and the defects existing in the prior art, the invention provides a catalytic oxidation device and a catalytic oxidation method for efficiently treating VOCs organic waste gas, wherein a catalytic oxidation reactor included in the catalytic oxidation device for efficiently treating VOCs organic waste gas is formed by combining a plurality of independent single-tube reactors, and the defects existing in the traditional reactors are effectively overcome.
The technical scheme for solving the problems is as follows: the utility model provides a catalytic oxidation device of VOCs organic waste gas is handled to high efficiency, includes dry filter (1), flame arrester (2), heat exchanger (3), heater (4) and catalysis-oxidation reactor, wherein, dry filter (1) with flame arrester (2) link to each other, flame arrester (2) with the cold junction entry of heat exchanger (3) links to each other, the cold junction export of heat exchanger (3) with heater (4) link to each other, heater (4) with catalysis-oxidation reactor links to each other, catalysis-oxidation reactor with the hot junction entry of heat exchanger (3) links to each other, just the hot junction export of heat exchanger (3) links to each other with chimney (11).
Further, one end of the dry filter (1) is connected with an exhaust emission end or an adsorption concentration desorption end through an air inlet electric valve (V1), and the other end of the dry filter (1) is connected with the flame arrester (2); the cold end outlet of the heat exchanger (3) is connected with the inlet of the heater (4), and the outlet of the heater (4) is connected with the catalytic-oxidation reactor through an expansion joint (5); the hot end outlet of the heat exchanger (3) is connected with a chimney (11) through a draught fan (10).
Further, the catalytic oxidation reactor is composed of a gas distribution box (6), a catalyst module (7) and a gas mixing box (8), wherein an inlet of the gas distribution box (6) is connected with an outlet of the heater (4) through an expansion joint (5), an outlet of the gas distribution box (6) is connected with an inlet of the catalyst module (7) through a quick-change clamp (12), an outlet of the catalyst module (7) is connected with an inlet of the gas mixing box (8) through the quick-change clamp (12), and an outlet of the gas mixing box (8) is connected with a hot end inlet of the heat exchanger (3).
In the invention, the quick-change clamp has a U-shaped structure, and the clamp which is arranged on the upper part and the lower part of the U-shaped structure and extends outwards is hung at the outlet of the gas distribution box (6) and the inlet of the gas mixing box (8) so as to be convenient for taking, placing and changing at any time.
Further, an emergency exhaust valve (EV 1) and a pressure controller (P1) are connected to the gas distribution box (6).
The emergency exhaust valve (EV 1) and the pressure controller (P1) can prevent an excessive reaction, which leads to an increase in the pressure in the catalyst module (7).
Further, the catalyst module (7) is formed by assembling at least one single-tube reactor (71) in parallel, the single-tube reactor (71) is formed by a catalyst monomer (711), a fireproof sealing gasket (712), a cylinder (713), an insulating layer (714) and a reactor shell (715), wherein the catalyst monomer (711) is installed in the cylinder (713), the fireproof sealing gasket (712) is arranged between the catalyst monomer (711) and the cylinder (713), and the insulating layer (714) formed by fireproof insulating materials is filled between the cylinder (713) and the reactor shell (715).
In the invention, the catalytic converter module (7) adopts at least one single-tube reactor (71) to be assembled into a catalytic bed layer in parallel, and has the following beneficial effects: 1. the catalyst load is uniform, and the tightness is good; 2. the catalyst has quick ignition and high utilization rate, and can maintain excellent catalytic activity; 3. and the modularized design is convenient for the maintenance, regeneration and replacement of the catalyst.
Further, 1 to 4 of the catalyst monomers (711) are installed in the single-tube reactor (71), and the single-tube reactor (71) has a single-tube reactor gas inlet (72) and a single-tube reactor gas outlet (73), wherein the single-tube reactor gas inlet (72) is connected to the gas distribution box (6), and the single-tube reactor gas outlet (73) is connected to the gas mixing box (8).
In the present invention, the catalyst unit (711) may be, but is not limited to, a cylindrical shape, a square shape, or a rectangular parallelepiped shape, preferably a cylindrical shape, and a better catalyst utilization can be obtained. Further, when 2 to 4 pieces of the catalyst monomers (711) are installed in the single-tube reactor (71), the distance between two adjacent catalyst monomers (711) is 30 to 100mm.
In the present invention, the distance between two adjacent catalyst monomers (711) is 30 to 100mm, and in this range, better secondary mixing of the gases can be performed, thereby making the catalyst load uniform. For the installation of the catalyst units (711), each catalyst unit (711) is individually encapsulated with one sealing gasket, i.e. one sealed catalyst unit (711) is encapsulated, and then the subsequent catalyst units (711) are encapsulated at intervals of 30-100mm.
Further, the diameter of the cross section of the catalyst monomer (711) is 7.5 to 30 inches, and the layer height of each of the catalyst monomers (711) is 3 to 20 inches.
In the present invention, when the diameter of the cross section of the catalyst monomer (711) is 7.5 to 30 inches and the layer height of each of the catalyst monomers (711) is 3 to 20 inches, the catalyst has excellent catalytic activity under high load and low pressure drop. The specific dimensions may be dependent on the throughput and requirements of the VOC off-gas.
Further, a catalyst cooling system is arranged between the heater (3) and the catalytic-oxidation reactor, the catalyst cooling system is composed of a cooling air electric valve (V2) and a cooling fan (9), one end of the cooling air electric valve (V2) is connected with an inlet of the catalytic-oxidation reactor through the cooling fan (9), and the other end of the cooling air electric valve (V2) is communicated with the atmosphere.
In the present invention, the catalyst cool-supplementing system is provided at the inlet of the catalytic-oxidation reactor, and in particular, the catalyst cool-supplementing system may be located above or below the expansion joint (5) in order to prevent sintering of the catalyst caused by high temperature, overheating.
Further, a heat exchanger cold end inlet temperature controller (T30) is connected between the flame arrester (2) and the cold end inlet of the heat exchanger (3), a heat exchanger cold end outlet temperature controller (T31) is connected between the cold end outlet of the heat exchanger (3) and the inlet of the heater (4) near the cold end outlet of the heat exchanger (3), a heater inlet temperature controller (T40) is connected between the cold end outlet of the heat exchanger (3) and the inlet of the heater (4) near the inlet of the heater (4), a heater outlet temperature controller (T41) is connected between the outlet of the heater (4) and the inlet of the catalytic-oxidation reactor, a catalyst module inlet temperature controller (T70) is connected at the inlet of the catalytic-oxidation reactor, and a catalyst module outlet temperature controller (T71) is connected at the outlet of the catalytic-oxidation reactor.
Further, the catalytic oxidation method for efficiently treating VOCs organic waste gas comprises the following steps: the organic waste gas containing volatile organic compounds is used for removing dust and particulate matters in the waste gas through a dry filter (1); the organic waste gas after dust and particulate matters in the waste gas are removed enters a heat exchanger (3) after passing through a flame arrester (2); after heat exchange, the organic waste gas enters a heater (4), and when the difference delta T=T41-T40 between the temperature monitored by a heater outlet temperature controller (T41) and the temperature monitored by a heater inlet temperature controller (T40) is greater than a preset temperature, the heater (4) is started to heat the organic waste gas after heat exchange; the heated organic waste gas enters a catalytic-oxidation reactor for catalytic oxidation; the organic waste gas after catalytic oxidation is discharged to the atmosphere through a heat exchanger (3) and a chimney in sequence.
In the invention, the opening and closing of the cold air supplementing electric valve (V2) and the cooling fan (9) are controlled by the catalyst module inlet temperature controller (T70). The heater outlet temperature controller (T41) is used for measuring the gas temperature of the inlet of the catalytic-oxidation reactor, the heater inlet temperature controller (T40) is used for measuring the gas temperature of the inlet of the heater (4), and the heater outlet temperature controller (T41) and the heater inlet temperature controller (T40) are used for controlling the operation of the heater (4) together. The gas heated by the heater (4) is controlled by the inlet temperature controller (T70) of the catalyst module before entering the catalytic-oxidation reactor, and if the temperature monitored by the inlet temperature controller (T70) of the catalyst module is higher than a set value, the catalyst cooling supplementing system is started.
By adopting the technical scheme, the device for catalyzing-oxidizing and purifying the VOCs organic waste gas is characterized in that the waste gas is preheated by the heat exchanger and then heated by the heater, and then enters the catalyzing-oxidizing reactor, so that the heat of the catalyzing reaction is effectively utilized, and the energy consumption is reduced; the catalytic-oxidation reactor is formed by assembling single-tube reactors in parallel, and waste gas uniformly enters each single-tube reactor after passing through a gas distribution box, so that the uniformity of gas flow and temperature is optimized, and the utilization rate of the catalyst is improved; the single-tube reactor is connected with the gas distribution box and the gas mixing box through quick-change clamps, so that the catalytic module is convenient to install, maintain and replace; the size and the number of the single-tube reactors can be freely adjusted and assembled according to the exhaust gas flow, and batch production can be realized; the catalyst monomer is packaged in the cylinder body by the refractory sealing gasket, so that the tightness of the single-tube reactor is improved, and the efficiency reduction caused by short flow is avoided.
In summary, the invention improves the structure of the catalytic-oxidation reactor, reduces the energy consumption while improving the reliability of the device, ensures the utilization rate of the catalyst and the purification efficiency of the device to the waste gas, and ensures that the concentration of the organic waste gas at the inlet VOCs is 0.5-6g/m in the running process of the device 3 Reaction space velocity sv=5k—30K h -1 The device can remove VOCs with efficiency up to 99.5%.
Drawings
FIG. 1 is a schematic structural view of a catalytic oxidation unit for efficiently treating organic waste gas of VOCs in accordance with the present invention;
FIG. 2 is a schematic front view of a single tube reactor according to the present invention;
FIG. 3 is a schematic view of the cross-section of FIG. 2;
FIG. 4 is a schematic cross-sectional view of a catalyst cartridge according to the present invention.
In fig. 1 to 4, the list of parts represented by the respective reference numerals is as follows
1. Dry filter, 2, flame arrester, 3, heat exchanger, 4, heater, 5, expansion joint, 6, gas distribution box, 7, catalyst module, 71, single tube reactor, 711, catalyst, 712, refractory sealing liner, 713, cylinder, 714, heat preservation, 715, reactor shell, 72, single tube reactor air inlet, 73, single tube reactor air outlet, 8, gas mixing box, 9, air make-up fan, 10, induced draft fan, 11, chimney, 12, quick change clamp
V1, an air inlet electric valve, V2, a cold air supplementing electric valve, EV1, an emergency exhaust valve, P1 and a pressure controller
T30, heat exchanger cold end inlet temperature controller, T31, heat exchanger cold end outlet temperature controller, T40, heater inlet temperature controller, T41, heater outlet temperature controller, T70, catalyst module inlet temperature controller, T71, catalyst module outlet temperature controller
Detailed Description
The principles and features of the present invention are described below with reference to the drawings and examples, which are provided for illustration only and are not intended to limit the scope of the invention.
Fig. 1 is a schematic structural diagram of a catalytic oxidation device for efficiently treating organic exhaust gas of VOCs, which comprises a dry filter 1, a flame arrester 2, a heat exchanger 3, a heater 4 and a catalytic-oxidation reactor, wherein one end of the dry filter 1 is connected with an exhaust gas discharge end or an adsorption concentration desorption end through an air inlet electric valve V1, and the other end of the dry filter 1 is connected with the flame arrester 2; the flame arrester 2 is connected with a cold end inlet of the heat exchanger 3, a cold end outlet of the heat exchanger 3 is connected with an inlet of the heater 4, an outlet of the heater 4 is connected with the catalytic-oxidation reactor through an expansion joint 5, the catalytic-oxidation reactor is connected with a hot end inlet of the heat exchanger 3, and a hot end outlet of the heat exchanger 3 is connected with a chimney 11 through a draught fan 10.
The heat exchanger 3 is used for recycling heat of catalytic-oxidation reaction, the heater 4 is used for heating and preheating (preheating is that after the system is operated, gas heated by the heater 4 is subjected to catalytic oxidation reaction to obtain reaction heat, and the heat is recycled by the heat exchanger 3 to preheat the waste gas) so as to reach the ignition temperature of the catalyst. The device is characterized in that a flame arrester 2 is arranged at the inlet of the device to prevent safety accidents caused by flame back channeling, and a dry filter 1 is arranged at the front section of the flame arrester and is used for removing dust and particulate matters in waste gas and preventing corrosion and blockage caused by deposition of the particulate matters on the surfaces of equipment and catalysts.
The catalytic oxidation reactor is composed of a gas distribution box 6, a catalyst module 7 and a gas mixing box 8, wherein the inlet of the gas distribution box 6 is connected with the outlet of the heater 4 through an expansion joint 5, the outlet of the gas distribution box 6 is connected with the inlet of the catalyst module 7 through a quick-change clamp 12, the outlet of the catalyst module 7 is connected with the inlet of the gas mixing box 8 through a quick-change clamp 12, and the outlet of the gas mixing box 8 is connected with the hot end inlet of the heat exchanger 3.
The gas distribution box 6 is connected with the single-tube reactor 71 in the catalytic module 7 through the quick-change clamp 12, and is used for uniformly distributing the heated waste gas, and the waste gas uniformly enters the single-tube reactor 71, so that the catalyst utilization rate is improved.
The outlet of the catalyst module 7 is provided with a gas mixing box 8 which is connected with the catalyst module 7 through a quick-change clamp 12 and is used for collecting waste gas at the outlet of the single-tube reactor 71 so as to improve the heat exchange efficiency of the heat exchanger 3.
The catalyst module 7 is formed by assembling at least one single-tube reactor 71 in parallel, wherein the single-tube reactor 71 is formed by a catalyst monomer 711, a fire-resistant sealing liner 712, a cylinder 713, a heat-insulating layer 714 and a reactor shell 715, wherein the catalyst monomer 711 is arranged in the cylinder 713, the fire-resistant sealing liner 712 is arranged between the catalyst monomer 711 and the cylinder 713, and the heat-insulating layer 714 formed by fire-resistant heat-insulating materials is filled between the cylinder 713 and the reactor shell 715.
The catalyst module 7 is formed by assembling a plurality of independent single-tube reactors 71 in parallel, the single-tube reactors 71 are internally provided with VOC oxidation catalysts (for example, 10.5 inch x4 inch+10.5 inch x6 inch catalysts, or 13 inch x6 inch+2x13 inch x4 inch catalysts are adopted), and the VOCs in the waste gas are under certain conditions (for example, xylene at SV=30000 h) -1 At a concentration of 6g/m 3 The conversion rate is higher than 99% at 280 ℃ and can be fully oxidized to generate H 2 O and CO 2 . A large amount of reaction heat is generated in the catalytic-oxidation reaction process, the heat is exchanged by the heat exchanger 3 and then used for heating the waste gas, and only a small amount of energy is needed to be input in the operation process of the device.
The single-tube reactor 71 is characterized in that a refractory sealing liner 712 is used for packaging a catalyst monomer 711 in a cylinder 713, a heat insulation layer 714 and a reactor shell 715 are sequentially arranged outside the cylinder 713, 1-4 catalyst monomers 711 are arranged in the single-tube reactor 71, the diameter of each catalyst monomer 711 is 7.5-30 inches, and the height of each catalyst monomer 711 is 3-20 inches.
The catalyst module 7 is also provided with a pressure controller P1 and an emergency exhaust valve EV1, so that the pressure in the catalyst module is prevented from rising due to too fast reaction.
A catalyst cooling system is arranged between the heater 3 and the catalytic-oxidation reactor, the catalyst cooling system is composed of a cooling air electric valve V2 and a cooling fan 9, one end of the cooling air electric valve V2 is connected with an inlet of the catalytic-oxidation reactor through the cooling fan 9, and the other end of the cooling air electric valve V2 is communicated with the atmosphere. And a cold-supplementing air cooler 9 and a cold-supplementing electromagnetic valve V2 are arranged between the expansion joint 5 and the inlet of the catalytic oxidation reactor and are used for regulating and controlling the temperature of gas entering the catalytic converter module 7, so that the damage to the catalyst caused by overhigh temperature is prevented.
The cold end inlet and the cold end outlet of the heat exchanger 3 are respectively provided with temperature controllers T30 and T31, the inlet and the outlet of the heater 4 are respectively provided with temperature controllers T40 and T41, and the inlet and the outlet of the catalyst module 7 are respectively provided with temperature controllers T70 and T71 which are respectively used for controlling the temperature of the inlet and the outlet of the equipment unit so as to maintain the exhaust gas parameters of the equipment unit.
A heat exchanger cold end inlet temperature controller T30 is connected between the flame arrester 2 and the cold end inlet of the heat exchanger 3, a heat exchanger cold end outlet temperature controller T31 is connected between the cold end outlet of the heat exchanger 3 and the inlet of the heater 4 and is close to the cold end outlet of the heat exchanger 3, a heater inlet temperature controller T40 is connected between the cold end outlet of the heat exchanger 3 and the inlet of the heater 4 and is close to the inlet of the heater 4, a heater outlet temperature controller T41 is connected between the outlet of the heater 4 and the inlet of the catalytic-oxidation reactor, a catalyst module inlet temperature controller T70 is connected at the inlet of the catalytic-oxidation reactor, and a catalyst module outlet temperature controller T71 is connected at the outlet of the catalytic-oxidation reactor.
The catalytic oxidation method for efficiently treating VOCs organic waste gas comprises the following steps: the organic waste gas containing volatile organic compounds is used for removing dust and particulate matters in the waste gas through a dry filter 1; the organic waste gas after dust and particulate matters in the waste gas are removed enters a heat exchanger 3 after passing through a flame arrester 2; after heat exchange, the organic waste gas enters a heater 4, and when the difference delta T=T41-T40 between the temperature monitored by a heater outlet temperature controller T41 and the temperature monitored by a heater inlet temperature controller T40 is greater than a preset temperature (the specific value of the preset temperature depends on different catalytic oxidation reaction conditions), the heater 4 is started to heat the organic waste gas after heat exchange; the heated organic waste gas enters a gas distribution box 6 of the catalytic-oxidation reactor through an expansion joint 5, then enters a catalyst module 7 for catalytic oxidation, and is discharged through a gas mixing box 8; the discharged gas is discharged to the atmosphere through the heat exchanger 3 and the chimney in sequence. Wherein, the temperature monitored by the inlet temperature controller T70 of the catalyst module is set to be <400 ℃, the temperature monitored by the outlet temperature controller T71 of the catalyst module is set to be <600 ℃, when the temperature monitored by the T70 is >400 ℃ or the temperature monitored by the T71 is >600 ℃, the catalyst cooling system is started, the output power of the heater 4 is reduced, wherein, when the temperature monitored by the inlet temperature controller T30 of the cold end of the heat exchanger is > the preset temperature (the specific value of the preset temperature depends on different catalytic oxidation reaction conditions), the rotating speed of the induced draft fan 10 is increased, when the temperature monitored by the outlet temperature controller T31 of the cold end of the heat exchanger is less than the temperature monitored by the inlet temperature controller T40 of the heat exchanger, the operation of the heater 4 is controlled by the inlet temperature controller T40 of the heater, and when the temperature monitored by the outlet temperature controller T31 of the cold end of the heat exchanger is > the temperature monitored by the inlet temperature controller T40 of the heat exchanger, the operation of the heater 4 is controlled by the outlet temperature controller T31 of the cold end of the heat exchanger.
After the heat exchange, heating and catalytic-oxidation processes, the organic pollutants of the main VOCs are thoroughly decomposed, and the clean gas is discharged into the atmosphere.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (6)
1. A catalytic oxidation device for efficiently treating VOCs organic waste gas is characterized by comprising a dry filter (1), a flame arrester (2), a heat exchanger (3), a heater (4) and a catalytic-oxidation reactor, wherein,
the dry filter (1) is connected with the flame arrester (2), the flame arrester (2) is connected with the cold end inlet of the heat exchanger (3), the cold end outlet of the heat exchanger (3) is connected with the heater (4), the heater (4) is connected with the catalytic-oxidation reactor, the catalytic-oxidation reactor is connected with the hot end inlet of the heat exchanger (3), and the hot end outlet of the heat exchanger (3) is connected with the chimney (11),
one end of the dry filter (1) is connected with an exhaust emission end or an adsorption concentration desorption end through an air inlet electric valve (V1), and the other end of the dry filter (1) is connected with the flame arrester (2); the cold end outlet of the heat exchanger (3) is connected with the inlet of the heater (4), and the outlet of the heater (4) is connected with the catalytic-oxidation reactor through an expansion joint (5); the hot end outlet of the heat exchanger (3) is connected with a chimney (11) through a draught fan (10),
the catalytic-oxidation reactor consists of a gas distribution box (6), a catalyst module (7) and a gas mixing box (8), wherein the inlet of the gas distribution box (6) is connected with the outlet of the heater (4) through an expansion joint (5), the outlet of the gas distribution box (6) is connected with the inlet of the catalyst module (7) through a quick-change clamp (12), the outlet of the catalyst module (7) is connected with the inlet of the gas mixing box (8) through the quick-change clamp (12), the outlet of the gas mixing box (8) is connected with the hot end inlet of the heat exchanger (3),
the catalyst module (7) is formed by assembling at least one single-tube reactor (71) in parallel, the single-tube reactor (71) is formed by a catalyst monomer (711), a fireproof sealing gasket (712), a cylinder (713), an insulating layer (714) and a reactor shell (715), wherein the catalyst monomer (711) is arranged in the cylinder (713), the fireproof sealing gasket (712) is arranged between the catalyst monomer (711) and the cylinder (713), the insulating layer (714) formed by fireproof insulating materials is filled between the cylinder (713) and the reactor shell (715),
1-4 pieces of the catalyst monomer (711) are arranged in the single-tube reactor (71), and the single-tube reactor (71) is provided with a single-tube reactor air inlet (72) and a single-tube reactor air outlet (73), wherein the single-tube reactor air inlet (72) is connected with the gas distribution box (6), and the single-tube reactor air outlet (73) is connected with the gas mixing box (8).
2. The catalytic oxidation device for efficiently treating organic exhaust gas of VOCs according to claim 1, wherein the gas distribution box (6) is connected with an emergency exhaust valve (EV 1) and a pressure controller (P1).
3. Catalytic oxidation unit for the efficient treatment of organic waste gases from VOCs according to claim 1, characterized in that when 2-4 of the catalyst units (711) are installed in the single tube reactor (71), the distance between two adjacent catalyst units (711) is 30-100mm.
4. The catalytic oxidation device for efficiently treating organic exhaust gas from VOCs according to claim 1, wherein the cross-section of the catalyst units (711) has a diameter of 7.5-30 inches and the layer height of each of the catalyst units (711) is 3-20 inches.
5. The catalytic oxidation device for efficiently treating organic waste gas of VOCs according to claim 1, wherein a catalyst cooling system is arranged between the heater (4) and the catalytic-oxidation reactor, the catalyst cooling system is composed of a cooling air electric valve (V2) and a cooling fan (9), one end of the cooling air electric valve (V2) is connected with an inlet of the catalytic-oxidation reactor through the cooling fan (9), and the other end of the cooling air electric valve (V2) is communicated with the atmosphere.
6. The catalytic oxidation device for efficiently treating organic exhaust gas from VOCs according to claim 1, wherein a heat exchanger cold end inlet temperature controller (T30) is connected between the flame arrestor (2) and the cold end inlet of the heat exchanger (3), a heat exchanger cold end outlet temperature controller (T31) is connected between the cold end outlet of the heat exchanger (3) and the heater (4) inlet near the cold end outlet of the heat exchanger (3), a heater inlet temperature controller (T40) is connected between the cold end outlet of the heat exchanger (3) and the heater (4) inlet near the heater (4) inlet, a heater outlet temperature controller (T41) is connected between the heater (4) outlet and the catalytic-oxidation reactor inlet, a catalyst module inlet temperature controller (T70) is connected at the catalytic-oxidation reactor inlet, and a catalyst module outlet temperature controller (T71) is connected at the catalytic-oxidation reactor outlet.
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| CN108654371A (en) * | 2018-07-12 | 2018-10-16 | 江苏德义通环保科技有限公司 | A kind of intrinsic safety type VOCs emission-control equipments and method |
| CN111744359A (en) * | 2020-07-02 | 2020-10-09 | 江苏山淼环境工程有限公司 | Safe and efficient catalytic device |
| CN115041017A (en) * | 2022-05-13 | 2022-09-13 | 南京都乐制冷设备有限公司 | Device and method for removing VOCs in closed area |
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