CN115253630A - RTO waste gas treatment system with multiple safety protection and treatment method thereof - Google Patents
RTO waste gas treatment system with multiple safety protection and treatment method thereof Download PDFInfo
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- CN115253630A CN115253630A CN202210678712.3A CN202210678712A CN115253630A CN 115253630 A CN115253630 A CN 115253630A CN 202210678712 A CN202210678712 A CN 202210678712A CN 115253630 A CN115253630 A CN 115253630A
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- 238000001179 sorption measurement Methods 0.000 claims abstract description 77
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 58
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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
-
- 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
- B01D53/04—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 with stationary adsorbents
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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
- B01D53/30—Controlling by gas-analysis apparatus
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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
- B01D53/343—Heat recovery
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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
- B01D53/38—Removing components of undefined structure
- B01D53/44—Organic components
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/061—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating
- F23G7/065—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel
- F23G7/066—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel preheating the waste gas by the heat of the combustion, e.g. recuperation type incinerator
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- 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
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2206/00—Waste heat recuperation
- F23G2206/10—Waste heat recuperation reintroducing the heat in the same process, e.g. for predrying
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/14—Gaseous waste or fumes
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Abstract
The invention discloses an RTO waste gas treatment system with multiple safety protection, which comprises an RTO waste gas adsorption treatment device and an RTO combustion oxidation discharge device; the RTO waste gas adsorption treatment device comprises a main path treatment path, a first bypass adsorption path and a second bypass adsorption path; the RTO combustion oxidation discharge device comprises an exhaust gas transmission path, an RTO thermal oxidation path and a cooling discharge path; a treatment method of the RTO exhaust gas treatment system with multiple safety protections is also disclosed. The RTO waste gas adsorption treatment device is convenient for adjusting the concentration of waste gas in real time, avoids the problem of explosion caused by overlarge internal pressure, realizes the purpose of timely pressure relief and explosion relief, and improves the operation stability and the waste gas treatment safety of the device; RTO burning oxidation discharging equipment makes the waste gas heat up to abundant oxidation purification after the oxidizing temperature fast and discharges, realizes improving the abundant degree of burning and the combustion efficiency of waste gas under the prerequisite of good exhaust-gas treatment security.
Description
Technical Field
The invention relates to the technical field of waste gas treatment, in particular to an RTO waste gas treatment system with multiple safety protections and a treatment method thereof.
Background
With the continuous and deep development of environmental protection policy in recent years, RTO also becomes an efficient and hot process and technology for treating the industrial waste gas of Volatile Organic Compounds (VOCs). However, most of the waste gases of the chemical engineering VOCs are flammable and explosive gases, the concentration of the waste gases is high, serious safety accidents happen to the waste gas treatment device in succession, and most of the waste gases are related to unreasonable selection of the VOCs technology of enterprises. Secondly, the regenerator is required to be subjected to operations of heat accumulation, heat release, cleaning and the like every time the regenerator is used, namely, after the regenerator releases heat, a proper amount of clean gas is introduced for cleaning immediately, heat accumulation can be continued after the cleaning is finished, and redundant heat is directly discharged out of the RTO system along with the additionally introduced clean gas in the process, so that great energy waste is caused. Therefore, it is urgently needed to develop an RTO exhaust gas treatment system capable of continuously realizing exhaust gas adsorption and combustion purification, which not only integrates the functions of gas concentration real-time detection, pressure relief explosion venting, fire resistance explosion, oxidation purification and the like, but also can avoid the problem of waste heat waste, thereby realizing the purpose of multiple safety protection.
Disclosure of Invention
In order to overcome the technical problem, the invention discloses an RTO waste gas treatment system with multiple safety protections and a treatment method thereof.
The technical scheme adopted by the invention for realizing the purpose is as follows:
an RTO waste gas treatment system with multiple safety protection comprises an RTO waste gas adsorption treatment device and an RTO combustion oxidation discharge device which are sequentially arranged;
the RTO waste gas adsorption treatment device comprises a main path treatment path, a first bypass adsorption path and a second bypass adsorption path, wherein the main path treatment path and the first bypass adsorption path are arranged in sequence, and the second bypass adsorption path is arranged in parallel with the main path treatment path;
the RTO combustion oxidation discharging device comprises a waste gas transmission path and an RTO thermal oxidation path which are communicated with each other through a loop, the RTO thermal oxidation path is communicated with a cooling discharging path, and the waste gas transmission path is connected with the main processing path.
The above RTO waste gas treatment system with multiple safety protections, wherein the main processing path comprises a pipeline static pressure box, a first gas concentration detector, a buffer tank and a second gas concentration detector which are connected in sequence;
a first explosion venting device and a second explosion venting device are respectively arranged between the pipeline static pressure box and the first gas concentration detector as well as between the first gas concentration detector and the buffer tank;
and a first pipeline flame arrester is arranged between the second explosion venting device and the buffer tank, and the second gas concentration detector is connected with a second pipeline flame arrester.
The above RTO exhaust gas treatment system with multiple safety protections, wherein the buffer tank includes a first air inlet, a second air inlet, a first air outlet and a first pressure relief port;
the first air inlet is connected with the first pipeline flame arrester;
the first gas outlet is connected with the second gas concentration detector;
and the second air inlet is communicated with a first fresh air ventilating device.
The RTO waste gas treatment system with multiple safety protections comprises a first bypass adsorption path, a second bypass adsorption path and a third bypass adsorption path, wherein the first bypass adsorption path comprises a third fan and a first activated carbon adsorption device which are sequentially arranged, the third fan is connected with a second gas concentration detector, and a sixth valve is arranged between the second gas concentration detector and the third fan.
In the RTO exhaust gas treatment system with multiple safety protections, the second bypass adsorption path includes a second activated carbon adsorption device connected to the second fan, and a seventh valve is disposed between the second fan and the second activated carbon adsorption device.
In the above RTO exhaust gas treatment system with multiple safety protections, the RTO thermal oxidation path includes a plurality of sets of regenerators arranged in parallel, the regenerators are correspondingly provided with combustion oxidation cavities, the combustion oxidation cavities are provided with the flame guns, and the flame guns are externally connected with combustion components;
defining the regenerator for waste gas combustion as a combustion regenerator, and the regenerator for preheating and warming as a preheating regenerator;
and the waste heat of the high-temperature waste gas sequentially passes through the combustion heat storage chamber and the preheating heat storage chamber, and absorbs heat by the cooling discharge path to form heat internal circulation.
The RTO waste gas treatment system with multiple safety protections is characterized in that the waste gas transmission path comprises a fourth fan and a fourth explosion venting device which are sequentially arranged, and the fourth explosion venting device is communicated with the heat storage chamber.
The RTO waste gas treatment system with multiple safety protection is characterized in that the cooling discharge path comprises a high-temperature heat exchange device and a chimney which are sequentially arranged, the high-temperature heat exchange device is connected with the heat storage chamber, and a circulating water cooling device is externally connected with the high-temperature heat exchange device.
The RTO waste gas treatment system with multiple safety protections comprises a third gas inlet, a second gas outlet, a third gas outlet and a fourth gas outlet;
the third air inlet is connected with the fourth explosion venting device;
the second air outlet is connected with the fourth fan;
the third air outlet is connected with the chimney;
and the fourth air outlet is connected with the high-temperature heat exchange device.
A treatment method of an RTO (regenerative thermal oxidizer) waste gas treatment system with multiple safety protections comprises the following steps:
step 2, mixing and stabilizing the waste gas by the pipeline static pressure box, and then conveying the waste gas to a buffer tank in a long distance, wherein a first gas concentration detector detects the concentration of the waste gas;
when the first gas concentration detector detects that the concentration of the waste gas reaches a first set value, the first fresh air ventilation device is started to supplement fresh air into the buffer tank;
when the first gas concentration detector detects that the concentration of the waste gas reaches a second set value, the waste gas is subjected to emergency discharge through a second bypass adsorption path;
when the concentration of the waste gas detected by the second gas concentration detector reaches a third set value, the first fresh air ventilation device is started to supplement fresh air into the buffer tank;
when the second gas concentration detector detects that the concentration of the waste gas reaches a fourth set value, the waste gas is subjected to emergency discharge through a first bypass adsorption path;
step 4, if the concentration of the waste gas detected by the second gas concentration detector is in accordance with the range of the set value, a second fresh air valve is opened;
step 6, the combustion assembly works, the waste gas absorbs heat and is heated up through the combustion regenerator, and the waste gas is ignited by a flame gun in the combustion oxidation cavity and is heated up to the oxidation temperature of 760 ℃, so that the organic components in the waste gas are decomposed into carbon dioxide and water;
step 7, fully burning the waste gas in the combustion oxidation cavity to obtain purified gas;
step 8, introducing gas with a large amount of heat into a preheating regenerator so as to transfer waste heat into the preheating regenerator;
and 9, allowing the gas to enter the high-temperature heat exchange device, and discharging the gas from a chimney after further waste heat transfer.
The invention has the beneficial effects that: the RTO waste gas adsorption treatment device optimally sets the main path treatment path, the first bypass adsorption path and the second bypass adsorption path, so that the concentration treatment and emergency adsorption discharge path of RTO waste gas are reasonably planned, the concentration of waste gas discharged through the buffer tank 16 is conveniently adjusted in real time, the problem of explosion caused by overlarge internal pressure is effectively avoided, the purpose of timely pressure relief and explosion relief is realized, and the operation stability and the waste gas treatment safety of the device are improved; the RTO combustion oxidation discharge device is optimally provided with the waste gas transmission path, the RTO thermal oxidation path and the cooling discharge path, so that waste gas reaching a safe concentration range is quickly heated to an oxidation temperature and then is sufficiently oxidized, purified and discharged, and the sufficient combustion degree and the combustion efficiency of the waste gas are effectively improved on the premise of good waste gas treatment safety; secondly, still can guarantee to need not the parking when the device breaks down or carries out periodic maintenance, satisfy the whole period of the whole year exhaust-gas treatment demand, improve exhaust-gas treatment efficiency, stability and security.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of an RTO waste gas adsorption treatment device according to the present invention;
FIG. 3 is a schematic structural diagram of an RTO combustion oxidation exhaust apparatus according to the present invention.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to facilitate the understanding and appreciation of the technical solutions of the present invention, rather than to limit the invention thereto.
Example (b): referring to fig. 1 to 3, the embodiment provides an RTO exhaust gas treatment system with multiple safety protections, which includes an RTO exhaust gas adsorption treatment device and an RTO combustion oxidation discharge device, which are sequentially arranged;
the RTO waste gas adsorption treatment device comprises a main processing path 1, a first bypass adsorption path 2 and a second bypass adsorption path 3, wherein the main processing path 1 and the first bypass adsorption path 2 are sequentially arranged, and the second bypass adsorption path is arranged in parallel with the main processing path 1;
the RTO combustion oxidation discharging device comprises a waste gas transmission path 4 and an RTO thermal oxidation path 5 which are communicated through a loop, the RTO thermal oxidation path 5 is communicated with a cooling discharging path 6, and the waste gas transmission path 4 is connected with the main path processing path 1.
Specifically, the RTO exhaust gas adsorption treatment device optimally sets the main path treatment path 1, the first bypass adsorption path 2 and the second bypass adsorption path 3, so as to achieve reasonable planning of the concentration treatment and the emergency adsorption discharge path of the RTO exhaust gas, facilitate real-time adjustment of the concentration of the exhaust gas discharged through the buffer tank 16, effectively avoid the problem of explosion caused by excessive internal pressure, achieve the purpose of timely pressure release and explosion release, and improve the operation stability and the exhaust gas treatment safety of the device; and the RTO combustion oxidation discharging device is optimally provided with the waste gas transmission path 4, the RTO thermal oxidation path 5 and the cooling discharging path 6, so that waste gas reaching a safe concentration range is quickly heated to an oxidation temperature and then is fully oxidized, purified and discharged, and the full combustion degree and the combustion efficiency of the waste gas are effectively improved on the premise of good waste gas treatment safety.
Preferably, the main processing path 1 comprises a pipeline static pressure box 11, a first gas concentration detector 131, a buffer tank 16 and a second gas concentration detector 132 which are connected in sequence;
a first explosion venting device 121 and a second explosion venting device 122 are respectively arranged between the pipeline static pressure box 11 and the first gas concentration detector 131, and between the first gas concentration detector 131 and the buffer tank 16;
a first pipeline flame arrester 151 is arranged between the second explosion venting device 122 and the buffer tank 16, and a second pipeline flame arrester 152 is connected to the second gas concentration detector 132; the pipeline static pressure box 11 is used for mixing and stabilizing the exhaust gas collected by a plurality of workshops; the first gas concentration detector 131 and the second gas concentration detector 132 are respectively used for detecting the concentration of the exhaust gas treated and discharged through the pipeline static pressure box 11 and the buffer tank 16, and optimizing the concentration detection accuracy of each node of the exhaust gas treatment process; the first explosion venting device 121 and the second explosion venting device 122 are respectively used for timely releasing pressure and venting explosion when the pressure in the pipeline is too high, so that the explosion problem caused by high pressure is avoided; the first pipeline flame arrester 151 is used for blocking flame transmission between the static pressure box and the buffer tank 16, and the second pipeline flame arrester 152 is used for blocking flame transmission between the buffer tank 16 and subsequent devices, so that the safety of waste gas treatment between the devices and pipelines is further enhanced.
Preferably, the buffer tank 16 comprises a first air inlet, a second air inlet, a first air outlet and a first pressure relief port;
the first air inlet is connected with the first pipe flame arrester 151;
the first gas outlet is connected with the second gas concentration detector 132;
the second air inlet is communicated with a first fresh air ventilating device; the first fresh air ventilation device is used for introducing fresh air when the first gas concentration detector 131 detects that the concentration of the waste gas is too high, and mixing the gas in the buffer tank 16 to dilute the waste gas to obtain waste gas with proper concentration.
Further, a first valve 141 is arranged between the second explosion venting device 122 and the first pipeline flame arrester 151, a second valve 142 is arranged between the first pipeline flame arrester 151 and the first gas inlet, and a third valve 143 is arranged between the first gas outlet and the second gas concentration detector 132; specifically, the first valve 141, the second valve 142, and the third valve 143 are used to communicate or block the transmission of the exhaust gas, so as to adjust the throughput of the exhaust gas entering the first pipeline flame arrester 151, the buffer tank 16, and the second gas concentration detector 132, respectively, and perform interlock switching by using valves, etc., thereby further enhancing the safety of the exhaust gas treatment between the device and the pipeline.
Further, the first fresh air ventilation device comprises a first fan 171 and a first fresh air valve 144 which are sequentially arranged, the first fan 171 is communicated with a first ventilation pipe for introducing fresh air, and a fourth valve 145 is arranged between the first fresh air valve 144 and the second air inlet; specifically, the first fan 171 delivers fresh air to the buffer tank 16 through the first ventilation pipe, the first fresh air valve 144 is used for adjusting the air intake rate and the air intake volume of the first fan 171, and the fourth valve 145 is used for communicating or blocking the fresh air transmission, so as to adjust the throughput of the fresh air entering the buffer tank 16, and the valve and the like are used for interlocking switching, thereby further enhancing the safety of waste gas treatment between the device and the pipeline.
Further, a third explosion venting device 123 is arranged at the first pressure relief opening, and the third explosion venting device 123 is used for timely relieving pressure and explosion when the internal pressure of the buffer tank 16 is too large, so that the explosion problem caused by high pressure is avoided.
Further, the main path processing path 1 further includes a second fan 172 connected to the pipeline static pressure tank 11, the second fan 172 is provided with a second vent pipe for introducing chemical waste gas, and a fifth valve 146 is provided between the second fan 172 and the pipeline static pressure tank 11; specifically, the second fan 172 is used for conveying RTO exhaust gas into the pipe static pressure box 11, and the fifth valve 146 is used for communicating or blocking the transmission of the exhaust gas, so as to adjust the throughput of the exhaust gas entering the buffer tank 16, and the interlock switching is performed by using valves and the like, thereby further enhancing the safety of the exhaust gas treatment between the device and the pipe.
Preferably, the first bypass adsorption path 2 includes a third fan and a first activated carbon adsorption device 22, which are sequentially arranged, the third fan is connected to the second gas concentration detector 132, and a sixth valve 23 is arranged between the second gas concentration detector 132 and the third fan; specifically, the third fan is used for conveying the waste gas exhausted through the treatment of the buffer tank 16 to the first activated carbon adsorption device 22, and the sixth valve 23 is used for communicating or blocking the transmission of the waste gas, so as to adjust the throughput of the waste gas entering the first activated carbon adsorption device 22, and the valves and the like are used for interlocking switching, thereby further enhancing the safety of waste gas treatment between the device and the pipeline.
Preferably, the second bypass adsorption path 3 includes a second activated carbon adsorption device 31 connected to the second fan 172, and a seventh valve 32 is disposed between the second fan 172 and the second activated carbon adsorption device 31; when the main path processing path 1 fails, the seventh valve 32 is opened, so that the exhaust gas enters the second activated carbon adsorption device 31 to be subjected to adsorption treatment and then is exhausted urgently, and the valves and the like are used for interlocking switching, so that the safety of the exhaust gas treatment between the device and the pipeline is further enhanced.
Further, the first activated carbon adsorption device 22 and the second activated carbon adsorption device 31 respectively contain a first activated carbon filling layer and a second activated carbon filling layer; the first active carbon adsorption device 22 and the second active carbon adsorption device 31 are reasonably distributed with air, so that the gas respectively and uniformly passes through the flow passing sections of the first active carbon filling layer and the second active carbon filling layer in the fixed adsorption bed, physical adsorption (also called Van der Waals adsorption) is generated under the action of the intermolecular attraction of the active carbon surface and the organic waste gas during a certain retention time, organic components in the waste gas are adsorbed on the active carbon, so that the waste gas is purified, and the purified clean gas is discharged through a bypass emergency valve and a discharge port; wherein, its physical adsorption's characteristics are: (1) the adsorbate (organic waste gas) and the adsorbent (activated carbon) do not react with each other; (2) the process is faster; (3) the property of the adsorbent is not changed in the adsorption process; specifically, if the first activated carbon filling layer and the second activated carbon filling layer adopt granular activated carbon, the gas flow rate is lower than 0.6m/s; if the first activated carbon filling layer and the second activated carbon filling layer adopt fibrous activated carbon, the gas flow velocity is lower than 0.15m/s; if the first activated carbon filling layer and the second activated carbon filling layer adopt honeycomb activated carbon, the gas flow rate is lower than 1.2m/s; the adsorption temperature is lower than 40 ℃.
Specifically, the first gas concentration detector 131 and the second gas concentration detector 132 are used for detecting the concentration of the exhaust gas in the pipeline in real time, so as to ensure that the concentration of the exhaust gas subsequently entering the RTO combustion oxidation discharge device does not exceed a safe range. Wherein the exhaust gas concentration detection value of the first gas concentration detector 131: when LEL is equal to 25 percent of the first set value, the system warns, and the first fresh air ventilation device is started; when the second set value 50% lel is reached, the main path processing path 1 is stopped and the gas is emergently discharged through the second bypass adsorption path 3. The exhaust gas concentration detection value of the second gas concentration detector 132: when LEL is equal to 15 percent of the third set value, the system warns that the first fresh air ventilation device is started; when the fourth set value 20% lel is reached, the main processing path 1 is stopped, and the gas is emergency-discharged through the first bypass adsorption path 2.
Specifically, when the first gas concentration detector 131 detects that the concentration of the exhaust gas is too high, the first fresh air valve 144 and the first fan 171 are sequentially started, and the exhaust gas and the fresh air are uniformly mixed in the buffer tank 16 to reduce the concentration of the exhaust gas and then feed the exhaust gas to the RTO combustion oxidation discharge device, so as to prevent the RTO combustion oxidation discharge device from being over-heated due to the too high concentration of the exhaust gas; wherein, the buffer tank 16 is made of stainless steel materials and is provided with the discharge port for explosion venting, and the bottom of the buffer tank is provided with a sediment collecting facility.
Specifically, the first valve 141, the second valve 142, the third valve 143 and the fourth valve 145 are all manual valves, the fifth valve 146 is a workshop exhaust switch valve, and the sixth valve 23 and the seventh valve 32 are all bypass switch valves; the gas flow control range of each valve has a direct relationship with the exhaust gas concentration, wherein the gas flow range of the second valve 142 is 2/3Q-1/2Q, the gas flow of the third valve 143 is Q, the gas flow range of the fourth valve 145 is 1/3Q-1/2Q, and the gas flow of the sixth valve 23 and the seventh valve 32 is Q.
Preferably, the RTO thermal oxidation path 5 includes a plurality of sets of heat storage chambers 51 arranged in parallel, the heat storage chambers 51 are correspondingly provided with combustion oxidation cavities 52, the combustion oxidation cavities 52 are provided with flame guns 53, and the flame guns 53 are externally connected with combustion assemblies 54;
defining the regenerator 51 for exhaust gas combustion as a combustion regenerator, and the regenerator 51 for preheating and raising the temperature as a preheating regenerator; specifically, the regenerator 51 can ensure that the exhaust gas reaches the set oxidation temperature quickly and has enough residence time to fully oxidize the organic components in the exhaust gas;
the waste heat of the high-temperature waste gas sequentially passes through the combustion heat storage chamber and the preheating heat storage chamber, and is absorbed by the cooling discharge path 6 to form heat internal circulation; specifically, the combustion regenerator and the preheating regenerator are initiatively arranged, so that the waste gas is oxidized by the combustion regenerator to obtain purified gas with a large amount of heat, then the purified gas enters and transfers the carried heat to the preheating regenerator, and the cooling discharge path 6 is used for further absorbing the waste heat of the purified gas, so that the waste heat is intensively recycled in the regenerator 51 where the next waste gas to be combusted is realized, the fuel consumption is reduced, the energy utilization rate is improved, and the orderly and alternately performing of combustion oxidation and cleaning operations of different regenerators can be realized.
Preferably, the exhaust gas transmission path 4 comprises a fourth fan 41 and a fourth explosion venting device 42 which are arranged in sequence, and the fourth explosion venting device 42 is communicated with the heat storage chamber 51; specifically, the fourth fan 41 is communicated with the second pipeline flame arrester 152 through a pipeline and is controlled to be switched on and off by a twelfth valve, the fourth fan 41 conveys waste gas and/or fresh air which reach a safe concentration range into the heat storage chamber 51, and the fourth explosion venting device 42 is used for timely releasing pressure and explosion when the internal pressure of the pipeline is too high, so that the explosion problem caused by high pressure is avoided.
Preferably, the cooling discharge path 6 includes a high-temperature heat exchange device 61 and a chimney 62 which are sequentially arranged, the high-temperature heat exchange device 61 is connected with the regenerator 51, and the high-temperature heat exchange device 61 is externally connected with a circulating water cooling device 63; specifically, the combusted gas enters the high-temperature heat exchange device 61 for heat exchange, and the circulating water cooling device 63 further uses the waste heat in the preheating regenerator, so that the energy consumption is further reduced, and the energy utilization rate is improved.
Preferably, the regenerator 51 includes a third air inlet, a second air outlet, a third air outlet, and a fourth air outlet;
the third air inlet is connected with the fourth explosion venting device 42;
the second air outlet is connected with the fourth fan 41;
the third air outlet is connected with the chimney 62;
and the fourth air outlet is connected with the high-temperature heat exchange device 61.
Specifically, an eighth valve 55 is disposed between the fourth explosion venting device 42 and the third air inlet; the eighth valve 55 is an air inlet valve for communicating or blocking the transfer of exhaust gas and/or fresh air up to a safe concentration range in order to adjust the throughput of exhaust gas entering the regenerator 51, with a gas flow rate Q;
a ninth valve 56 is arranged between the second air outlet and the fourth fan 41; the ninth valve 56 is an exhaust valve for communicating or blocking the transmission of the insufficiently combusted exhaust gas so as to adjust the throughput of the exhaust gas entering the fourth fan 41, and the gas flow rate is Q;
a tenth valve 57 is arranged between the third air outlet and the chimney 62; the tenth valve 57 is a purge valve for discharging purge gas for purging the regenerator 51, and the gas flow rate is 1/10Q;
an eleventh valve 58 is arranged between the fourth air outlet and the high-temperature heat exchange device 61; the tenth valve 57 is used for communicating or blocking the transmission of the gas which is fully combusted, so as to adjust the throughput of the waste gas entering the high-temperature heat exchange device 61, and the valve and the like are used for interlocking switching, thereby further enhancing the safety of waste gas treatment between the device and the pipeline.
Further, regenerator 51 still includes the second pressure release mouth, in the second pressure release mouth is provided with fifth explosion venting device 59, fifth explosion venting device 59 is used for working as timely pressure release explosion venting when regenerator 51 internal pressure is too big, avoids appearing explosion problem because of the high pressure.
Further, the waste gas transmission path 4 further includes a second fresh air ventilation device, the second fresh air ventilation device includes a third ventilation pipe for introducing fresh air, and the third ventilation pipe is connected with the fourth fan 41 through a second fresh air valve 43; specifically, the second fresh air valve 43 is used for adjusting the air intake rate and the air intake amount entering the fourth fan 41 through the third ventilation pipe, the air flow rate of the second fresh air valve 43 is 1/10Q, and the valves and the like are used for performing interlocking switching, so that the safety of waste gas treatment between the device and the pipeline is further enhanced.
Specifically, the heat storage chamber 51 further comprises a built-in ceramic heat storage body, and the heat storage chamber 51 is provided with two chambers, three chambers or five chambers; the ceramic heat accumulator is convenient for accumulating a large amount of heat energy, provides efficient heat transfer and enhances the temperature rise reliability of waste gas.
Further, if the exhaust gas concentration is higher, the second fresh air valve 43 is opened to introduce fresh air to dilute the exhaust gas concentration; when the temperature of the heat storage chamber 51 exceeds 950 ℃, the eleventh valve 58 is opened, and high-temperature gas passes through the high-temperature heat exchange device 61 and is directly discharged from the chimney 62, so that the temperature of the heat storage chamber 51 is rapidly reduced and is controlled within a safe temperature range; the temperature range of the gas cooled by the high-temperature heat exchange device 61 is about 200-220 ℃, and the discharged gas is small in air volume and is discharged in the upper air after being mixed with the large air volume introduced by the chimney 62 and cooled.
The embodiment also discloses a treatment method of the RTO waste gas treatment system with multiple safety protections, which comprises the following steps:
step 2, mixing and stabilizing the waste gas by the pipeline static pressure box 11, and then conveying the waste gas to a buffer tank 16 for a long distance, wherein a first gas concentration detector 131 detects the concentration of the waste gas;
when the first gas concentration detector 131 detects that the concentration of the exhaust gas reaches a first set value, the first fresh air ventilation device is started to supplement fresh air into the buffer tank 16;
when the first gas concentration detector 131 detects that the concentration of the exhaust gas reaches a second set value, the exhaust gas is emergently discharged through the second bypass adsorption path 3;
when the second gas concentration detector 132 detects that the concentration of the exhaust gas reaches a third set value, the first fresh air ventilation device is started to replenish fresh air into the buffer tank 16;
when the second gas concentration detector 132 detects that the concentration of the exhaust gas reaches the fourth set value, the exhaust gas is emergently discharged through the first bypass adsorption path 2;
step 4, if the second gas concentration detector 132 detects that the concentration of the exhaust gas meets the range of the set value, the second fresh air valve 43 is opened;
step 6, the combustion assembly 54 works, the waste gas absorbs heat through the combustion regenerator to raise the temperature, and the waste gas is ignited by the flame gun 53 in the combustion oxidation cavity 52 to be heated to the oxidation temperature of 760 ℃, so that the organic components in the waste gas are decomposed into carbon dioxide and water;
step 7, fully burning the waste gas in the combustion oxidation cavity 52 to obtain purified gas;
step 8, introducing gas with a large amount of heat into a preheating regenerator so as to transfer waste heat into the preheating regenerator;
and 9, allowing the gas to enter the high-temperature heat exchange device 61, and discharging the gas from a chimney 62 after further waste heat transfer.
When the combustion oxidation operation is finished, the temperature of the hearth of the combustion regenerator is reduced to become a preheating regenerator for cleaning, the preheating regenerator with the temperature increased becomes a combustion regenerator for waiting for the next combustion oxidation operation, and the steps are alternated.
The RTO waste gas treatment system with multiple safety protection has the following advantages: the RTO waste gas adsorption treatment device optimally sets the main path treatment path, the first bypass adsorption path and the second bypass adsorption path, so that the concentration treatment and emergency adsorption discharge path of RTO waste gas are reasonably planned, the concentration of waste gas discharged through the buffer tank 16 is conveniently adjusted in real time, the problem of explosion caused by overlarge internal pressure is effectively avoided, the purpose of timely pressure relief and explosion relief is realized, and the operation stability and the waste gas treatment safety of the device are improved; and the RTO combustion oxidation discharging equipment optimizes the setting of the waste gas transmission path, the RTO thermal oxidation path and the cooling discharge path, so that the waste gas reaching the safe concentration range is quickly heated to the oxidation temperature and then is fully oxidized, purified and discharged, and the full combustion degree and the combustion efficiency of the waste gas are effectively improved on the premise of good waste gas treatment safety.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Those skilled in the art can make many possible variations and modifications to the disclosed solution, or modify the equivalent embodiments using the technical means and teachings disclosed above, without departing from the scope of the present solution. Therefore, all equivalent changes made according to the shape, structure and principle of the present invention should be covered by the protection scope of the present invention without departing from the contents of the technical scheme of the present invention.
Claims (10)
1. An RTO waste gas treatment system with multiple safety protection is characterized by comprising an RTO waste gas adsorption treatment device and an RTO combustion oxidation discharge device which are sequentially arranged;
the RTO waste gas adsorption treatment device comprises a main path treatment path, a first bypass adsorption path and a second bypass adsorption path, wherein the main path treatment path and the first bypass adsorption path are arranged in sequence, and the second bypass adsorption path is arranged in parallel with the main path treatment path;
the RTO combustion oxidation discharging device comprises a waste gas transmission path and an RTO thermal oxidation path which are communicated with each other through a loop, the RTO thermal oxidation path is communicated with a cooling discharging path, and the waste gas transmission path is connected with the main processing path.
2. The RTO effluent treatment system having multiple safety protections of claim 1 wherein said main processing path comprises a piping plenum, a first gas concentration probe, a buffer tank and a second gas concentration probe connected in series;
a first explosion venting device and a second explosion venting device are respectively arranged between the pipeline static pressure box and the first gas concentration detector as well as between the first gas concentration detector and the buffer tank;
and a first pipeline flame arrester is arranged between the second explosion venting device and the buffer tank, and the second gas concentration detector is connected with a second pipeline flame arrester.
3. The RTO exhaust treatment system with multiple safety protections of claim 2, wherein the buffer tank comprises a first air inlet, a second air inlet, a first air outlet, and a first pressure relief port;
the first air inlet is connected with the first pipeline flame arrester;
the first gas outlet is connected with the second gas concentration detector;
and the second air inlet is communicated with a first fresh air ventilation device.
4. The RTO exhaust gas treatment system with multiple safety protections according to claim 3, wherein said first bypass adsorption path comprises a third fan and a first activated carbon adsorption device arranged in sequence, said third fan is connected to said second gas concentration detector, and a sixth valve is arranged between said second gas concentration detector and said third fan.
5. The RTO exhaust gas treatment system with multiple safety protections of claim 4, wherein the second bypass adsorption path comprises a second activated carbon adsorption device connected to the second fan, and a seventh valve is disposed between the second fan and the second activated carbon adsorption device.
6. The RTO exhaust gas treatment system with multiple safety protections according to claim 5, wherein the RTO thermal oxidation path comprises a plurality of sets of heat storage chambers arranged in parallel, the heat storage chambers are correspondingly provided with combustion oxidation cavities, the combustion oxidation cavities are provided with flame guns, and the flame guns are externally connected with combustion components;
defining the regenerator for waste gas combustion as a combustion regenerator, and the regenerator for preheating and warming as a preheating regenerator;
and the waste heat of the high-temperature waste gas sequentially passes through the combustion heat storage chamber and the preheating heat storage chamber, and absorbs heat by the cooling discharge path to form heat internal circulation.
7. The RTO exhaust treatment system with multiple safety protections of claim 6, wherein said exhaust gas transport path comprises a fourth fan and a fourth explosion vent arranged in series, said fourth explosion vent being in communication with said regenerator.
8. The RTO waste gas treatment system with multiple safety protections of claim 7, wherein the cool-down discharge path comprises a high-temperature heat exchange device and a chimney, which are arranged in sequence, the high-temperature heat exchange device is connected with the regenerator, and the high-temperature heat exchange device is externally connected with a circulating water cooling device.
9. The RTO exhaust treatment system with multiple safety protections of claim 8, wherein the regenerator includes a third inlet port, a second outlet port, a third outlet port, and a fourth outlet port;
the third air inlet is connected with the fourth explosion venting device;
the second air outlet is connected with the fourth fan;
the third air outlet is connected with the chimney;
and the fourth air outlet is connected with the high-temperature heat exchange device.
10. A treatment method of an RTO (regenerative thermal oxidizer) waste gas treatment system with multiple safety protections is characterized by comprising the following steps:
step 1, opening a fifth valve, and pumping waste gas collected in a production workshop into a pipeline static pressure tank through a second fan;
step 2, mixing and stabilizing the waste gas by the pipeline static pressure box, and then conveying the waste gas to a buffer tank in a long distance, wherein a first gas concentration detector detects the concentration of the waste gas;
when the first gas concentration detector detects that the concentration of the waste gas reaches a first set value, the first fresh air ventilation device is started to supplement fresh air into the buffer tank;
when the first gas concentration detector detects that the concentration of the waste gas reaches a second set value, the waste gas is subjected to emergency discharge through a second bypass adsorption path;
step 3, uniformly mixing the waste gas by the buffer tank, and then discharging the waste gas through the air outlet, wherein the concentration of the waste gas is detected by the second gas concentration detector;
when the second gas concentration detector detects that the concentration of the waste gas reaches a third set value, the first fresh air ventilation device is started to supplement fresh air into the buffer tank;
when the second gas concentration detector detects that the concentration of the waste gas reaches a fourth set value, the waste gas is subjected to emergency discharge through a first bypass adsorption path;
step 4, if the concentration of the waste gas detected by the second gas concentration detector is in accordance with the range of the set value, a second fresh air valve is opened;
step 5, when the temperature of the combustion regenerator reaches 760 ℃, opening an eighth valve to introduce waste gas;
step 6, the combustion assembly works, the waste gas absorbs heat through the combustion regenerator to be heated, and the waste gas is ignited by a flame gun in the combustion oxidation cavity to be heated to the oxidation temperature of 760 ℃, so that the organic components in the waste gas are decomposed into carbon dioxide and water;
step 7, fully burning the waste gas in the combustion oxidation cavity to obtain purified gas;
step 8, introducing gas with a large amount of heat into a preheating regenerator so as to transfer waste heat into the preheating regenerator;
and 9, allowing the gas to enter the high-temperature heat exchange device, and discharging the gas from a chimney after further waste heat transfer.
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