CN110665334A - Organic waste gas treatment process combining runner concentration and thermal storage oxidation - Google Patents
Organic waste gas treatment process combining runner concentration and thermal storage oxidation Download PDFInfo
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- CN110665334A CN110665334A CN201910855377.8A CN201910855377A CN110665334A CN 110665334 A CN110665334 A CN 110665334A CN 201910855377 A CN201910855377 A CN 201910855377A CN 110665334 A CN110665334 A CN 110665334A
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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
- B01D53/02—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
- B01D53/06—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 moving adsorbents, e.g. rotating beds
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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
- B01D2253/106—Silica or silicates
- B01D2253/108—Zeolites
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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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Abstract
A process for treating the organic waste gas by combining rotary wheel concentration with thermal storage oxidation includes such steps as discharging the high-temp gas after heat exchange from exhaust tube, mixing the heated one with another, introducing it to zeolite rotary wheel concentration equipment, generating desorbed gas, pumping the desorbed gas to valve group under each thermal storage bed in thermal storage oxidation equipment, introducing it to thermal storage oxidation equipment for oxidizing, switching the valve groups, returning part of or returning all of the desorbed gas to air inlet of air inlet fan, mixing it with organic waste gas, and purifying. The outlet gas containing the residual waste gas in the bed layer returns to the inlet of the zeolite rotating wheel for retreatment, the waste gas removal efficiency is high, and the possibility of short-time high-concentration pulse discharge is avoided.
Description
Technical Field
The invention relates to the technical field of organic gas treatment, in particular to an organic waste gas treatment process combining runner concentration and thermal storage oxidation.
Background
Organic waste gases are common pollutants. The organic waste gas not only causes harm to the environment and human health, but also is one of the precursors of PM 2.5.
Low concentration organic waste gases, e.g. at a concentration of 1000mg/m3If the following organic waste gas is directly treated by oxidation or adsorption and other processes, the equipment investment and the operating cost are large. Zeolite rotary wheel concentration equipment is generally adopted for concentration treatment, and organic waste gas with large air quantity and low concentration is converted into organic waste gas with small air quantity and high concentration. Not only greatly reducing subsequent oxidation and the likeThe investment of the treatment equipment can be reduced and even eliminated due to the increased concentration.
Oxidation is the most thorough organic waste gas treatment technology. The heat accumulating type thermal oxidation (RTO) and the heat accumulating type catalytic oxidation (RCO) adopt a ceramic heat accumulator for heat recovery, and the heat of the purified gas after oxidation treatment is stored for heating the intake air, so that the energy utilization efficiency is improved, and the operating cost is reduced. In general, regenerative thermal oxidation is suitable for organic concentrations of not more than 10g/m3The organic waste gas treatment and the heat accumulating type catalytic oxidation are suitable for organic matter concentration not more than 6g/m3And (4) treating the organic waste gas. The two oxidation treatment technologies have respective characteristics and optimal application ranges. The regenerative thermal oxidation adopts thermal oxidation reaction with the temperature higher than 760 ℃ to convert organic matters into carbon dioxide and water, the applicable range of the organic matters is wide, and all the organic matters which can be combusted except silane can be treated. The regenerative catalytic oxidation adopts the catalytic oxidation reaction under the action of the catalyst, the reaction temperature is generally 300-500 ℃ and is lower than the regenerative thermal oxidation temperature, so the thermal balance can be achieved at a lower concentration than the regenerative thermal oxidation, additional supplementary fuel is not needed, and the regenerative catalytic oxidation is particularly suitable for the concentration lower than 1.5g/m3And (4) treating the organic waste gas. The heat accumulating type catalytic oxidation RCO adopting electric heating is not limited by safety distance due to no open fire, is more suitable for strict safety requirements, and can be arranged in areas where RTO cannot be used. However, the regenerative catalytic oxidation cannot treat organic matters such as organic chlorides and the like which can cause catalyst poisoning, and the application range is limited. In addition, the catalyst cost is high, and the waste catalyst is dangerous waste and needs to be treated by a professional company.
The regenerative beds of regenerative thermal oxidation RTO and regenerative catalytic oxidation RCO require periodic inlet (heating of the exhaust gas) and outlet (cooling of the purified gas after oxidation) processes. After the air inlet is finished, if the air inlet is immediately converted into the air outlet process, the residual organic waste gas in the heat storage bed layer is taken out, the existing organic matter concentration peak pulse emission is realized, the overall treatment efficiency is reduced, and the strict environmental protection requirement is not met. The number of the multi-bed type heat storage beds includes two types of even number beds and odd number beds. The odd number of beds are in the air inlet andand a purging process is arranged between the two gas outlet processes, and the untreated organic waste gas remained in the bed layer is blown to the oxidation chamber or returned to the inlet of the oxidation treatment equipment by adopting a clean gas purging or fan air extraction method. The odd number of beds are provided with purging operation, so that one more heat storage bed is required to be provided, namely one heat storage bed is used for purging, and the other heat storage beds are used for air inlet or air outlet operation. The odd number of beds may be 3 beds, or 5 beds, or 7 beds, or 9 beds, depending on the gas volume. The larger the amount of gas treated, the larger the number of beds. The amount of gas treated by the 3 beds is not more than 10 ten thousand m 3/h. 5-bed gas treatment amount of 10-20 ten thousand meters3H is used as the reference value. Even numbered beds have no purging process and therefore one heat storage bed less than odd numbered beds. The even number of beds may be 2 beds, or 4 beds, or 6 beds, or 8 beds, depending on the gas volume. Even number bed because do not have the purge process, the gas after the processing can the high concentration pulse appear in the periodicity when business turn over gas, though the time is very short, can reduce whole treatment effeciency, does not accord with strict environmental protection requirement. The even number of beds has the advantages of obviously reduced investment, simpler operation process, light weight of equipment and small occupied area due to the fact that one heat storage bed is omitted, and the method is only suitable for occasions without limitation on short-time high-concentration discharge.
The zeolite wheel concentration is not the final treatment equipment, but only the organic gas is concentrated. Therefore, the concentration of the zeolite wheel needs to be combined with other treatment equipment so as to completely treat the organic waste gas finally. The combination of zeolite wheel concentration and regenerative oxidation treatment is a common integrated treatment process. Wherein the combination of zeolite wheel concentration and regenerative thermal oxidation RTO is common.
There are many examples of treatment systems combining zeolite wheel concentration with regenerative thermal oxidation RTO, regenerative catalytic oxidation RCO. For example, chinese patent CN105903313 discloses a zeolite wheel and a regenerative oxidation system comprising three regenerators. A combined zeolite wheel concentration and RTO treatment system is disclosed in CN 103007682. A combined zeolite rotor concentration and RCO treatment system is disclosed in CN 208212852.
Disclosure of Invention
The invention aims to provide a reasonably designed organic waste gas treatment process combining runner concentration and thermal storage oxidation, wherein a thermal storage type oxidation system adopts an even number bed design, no purging operation is performed, the outlet gas containing residual bed layer waste gas is returned to the inlet of a zeolite runner for retreatment, the waste gas removal efficiency is high, and the possibility of short-time high-concentration pulse emission is avoided.
In order to achieve the purpose, the invention adopts the following technical scheme: organic waste gas is pumped into a zeolite rotating wheel concentration device by an air inlet fan for purification treatment, part of purified gas after purification treatment is discharged by an exhaust funnel, the other part of gas after purification treatment is pumped by a desorption fan and divided into two parts, wherein one part of purified gas enters a heat exchanger and carries out heat exchange treatment with part of high-temperature gas extracted from a regenerative oxidation device, the high-temperature gas cooled after heat exchange is discharged by the exhaust funnel, the heated one part of purified gas after heat exchange is converged with the other part of purified gas discharged by a regulating valve connected on a shunt pipeline and enters the zeolite rotating wheel concentration device for treatment to form desorption gas, an RTO fan pumps the desorption gas to a valve group connected below each regenerative bed in the regenerative oxidation device and sends the desorption gas into the regenerative oxidation device by the valve group for oxidation treatment, and the gas after oxidation treatment is switched by the valve group, and returning part of the waste gas to be discharged or all the waste gas to be returned to the air inlet end of the air inlet fan, mixing the waste gas with the organic waste gas, and then entering the zeolite rotating wheel concentration equipment for purification treatment.
Furthermore, the valve group is a three-way poppet valve, a first port of the three-way poppet valve is connected with an outlet end of the RTO fan, a second port of the three-way poppet valve is connected with an inlet end of a heat storage bed of the heat storage type oxidation equipment, and a third port of the three-way poppet valve is connected with an inlet end of the air inlet fan.
Furthermore, the valve group is formed by combining three-way valves and poppet valves, each valve group comprises one poppet valve and one three-way valve, wherein a first port of the poppet valve is connected with an outlet end of the RTO fan, a second port of the poppet valve is respectively connected with an inlet end of a heat storage bed of the heat storage type oxidation equipment and a first port of the three-way valve, a second port of the three-way valve is connected with an inlet end of the air inlet fan, and a third port of the three-way valve is connected with an inlet end of the exhaust pipe.
Furthermore, the valve group is formed by combining a plurality of poppet valves, each valve group comprises three poppet valves which are respectively used as an air inlet poppet valve, an air outlet poppet valve and an air return poppet valve, a first port of the air inlet poppet valve is connected with an outlet end of the RTO fan, and a second port of the air inlet poppet valve is respectively connected with an inlet end of a heat accumulation bed of the heat accumulation type oxidation equipment, a first port of the air outlet poppet valve and a first port of the air return poppet valve; the second port of the air outlet lifting valve is connected with the inlet end of the exhaust cylinder, and the second port of the air return lifting valve is connected with the inlet end of the air inlet fan.
Further, the zeolite rotating wheel concentration equipment is a cylinder rotating wheel or a disc rotating wheel; the device can be used singly or in parallel.
Further, the regenerative thermal oxidation device is a multi-bed Regenerative Thermal Oxidation (RTO) or can adopt a multi-bed Regenerative Catalytic Oxidation (RCO).
Further, the number of the heat storage beds in the heat storage type oxidation equipment is even.
Further, the poppet valve may be replaced with a butterfly valve.
Furthermore, the gas after oxidation treatment is switched by a valve group, partial return is carried out, partial discharge or all return is carried out, the time for returning the gas is more than or equal to the time calculated by the ratio of the height of the heat accumulating type oxidation equipment to the apparent flow rate of the heat accumulating bed, the time for returning the gas is the maximum of the time for completely discharging the gas, namely, the gas discharged from the heat accumulating type oxidation equipment is completely returned to the inlet of the zeolite rotating wheel concentration equipment for treatment, and when the time for returning the gas is equal to the time for completely discharging the gas, the valve group can be a butterfly valve, a poppet valve or.
After adopting the structure, the invention has the beneficial effects that: the invention provides an organic waste gas treatment process combining runner concentration and regenerative thermal oxidation, wherein a regenerative oxidation system adopts an even bed design, no purging operation is performed, outlet gas containing residual waste gas of a bed layer returns to an inlet of a zeolite runner for retreatment, the waste gas removal efficiency is high, and the possibility of short-time high-concentration pulse emission is avoided.
Description of the drawings:
FIG. 1 is a process flow diagram of the present invention.
FIG. 2 is a schematic view of the valve assembly of the present invention as a three-way poppet valve.
FIG. 3 is a schematic diagram of the connection of the valve assembly of the present invention as a three-way valve and poppet valve combination.
FIG. 4 is a schematic view of the valve assembly of the present invention being a combination of multiple poppet valves.
FIG. 5 is a flowchart of a process according to an embodiment I.
FIG. 6 is a schematic diagram of a three-way poppet valve in an intake state according to one embodiment.
FIG. 7 is a schematic view of a three-way poppet valve in an air bleed state according to an embodiment.
FIG. 8 is a flowchart of a process of the second embodiment.
FIG. 9 is a flowchart of a process of the third embodiment.
Fig. 10 is a schematic view of the three-way valve in the air return state in the third embodiment.
Fig. 11 is a schematic view of the three-way valve in the purge gas discharge state in the third embodiment.
FIG. 12 is a flowchart of a process of the fourth embodiment.
FIG. 13 is a flowchart of a fifth process in the embodiment.
Description of reference numerals:
the device comprises an air inlet fan 1, a zeolite rotating wheel concentration device 2, a desorption fan 3, a heat exchanger 4, a heat accumulating type oxidation device 5, a valve group 6, a three-way poppet valve 6-1, a three-way valve 6-2, a poppet valve 6-3, an air inlet poppet valve 6-3-1, an air outlet poppet valve 6-3-2, an air return poppet valve 6-3-3, an exhaust funnel 7, an adjusting valve 8 and an RTO fan 9.
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 7, the following technical solutions are adopted in the present embodiment (example one): in this embodiment, the air return time is equal to the air outlet time, that is, all the air outlet of the thermal storage type oxidation apparatus 5 returns to the inlet of the zeolite rotary wheel concentration apparatus 2 (drum rotary wheel concentration apparatus) for further treatment, and is not directly discharged to the exhaust funnel 7, at this time, the valve set 6 adopts the three-way poppet valve 6-1, and the treatment process is as follows:
the low-concentration organic waste gas is pressurized by the air inlet fan 1 and enters the cylinder type rotating wheel concentration device, the organic matters are adsorbed on the zeolite, the purified gas is discharged from the exhaust port of the cylinder type rotating wheel concentration device, part of the purified gas is discharged by the exhaust funnel 7, the other part of the purified gas is extracted by the desorption fan 3 and is divided into two parts, one of the high-temperature gases enters the heat exchanger 4 and is extracted from a combustion chamber in the heat accumulating type oxidation equipment 5 to carry out heat exchange, the heated and heated gas is combined with the other purified gas controlled by the regulating valve 8 to be used as desorption hot gas to pass through a desorption gas inlet in the cylinder type rotating wheel concentration equipment and enter a zeolite concentration rotating wheel in the cylinder type rotating wheel concentration equipment, the desorbed gas passes through a desorption gas outlet in the cylinder type rotating wheel concentration equipment to form desorption gas, and the desorption gas is pressurized by an RTO fan 9, after being controlled by a three-way poppet valve 6-1, the waste water enters a heat accumulating type oxidation device 5 for treatment; the valve rod of the three-way poppet valve 6-1 on the left side is positioned below, and the air inlet pipeline is communicated with the heat storage bed on the left side in the heat storage type oxidation equipment 5, namely the air inlet state is obtained; the valve rod of the right three-way poppet valve 6-1 is positioned above, and the air outlet pipeline is communicated with the heat storage bed on the right side in the heat storage type oxidation equipment 5, namely the air outlet state is obtained; the outlet gas passes through the lower end of the heat storage bed on the right side and the three-way poppet valve 6-1 on the right side, is converged with low-concentration organic waste gas, and then enters the zeolite concentration rotating wheel in the cylindrical rotating wheel concentration equipment again for treatment. In the next period, the valve rod positions of the three-way poppet valves 6-1 on the left and right sides are changed, and the gas inlet and outlet states of the heat storage beds on the left and right sides are changed.
After adopting above-mentioned structure, this embodiment's beneficial effect is as follows: the specific embodiment provides an organic waste gas treatment process combining runner concentration and thermal storage oxidation, a heat storage type oxidation system adopts an even number bed design, purging operation is not needed, outlet gas containing residual bed layer waste gas is returned to an inlet of a zeolite runner for retreatment, the waste gas removal efficiency is high, and the possibility of short-time high-concentration pulse emission is avoided.
Example two:
referring to fig. 8, in this embodiment, the air return time is equal to the air outlet time, that is, all the air outlet of the regenerative oxidation apparatus 5 returns to the inlet of the zeolite wheel concentration apparatus 2 for further treatment, and is not directly exhausted to the exhaust funnel 7, the valve set 6 adopts a three-way poppet valve, the zeolite wheel concentration apparatus 2 is a disc type zeolite wheel, the regenerative oxidation apparatus 5 is a regenerative catalytic oxidation RCO, and the treatment process is the same as that of the first embodiment.
Example three:
referring to fig. 9-11, the valve set 6 of the present embodiment is formed by combining the three-way valve 6-2 and the poppet valve 6-3, and the flow path is as follows:
the low-concentration organic waste gas is pressurized by the air inlet fan 1 and enters the cylinder type rotating wheel concentration device, the organic matters are adsorbed on the zeolite, the purified gas is discharged from the exhaust port of the cylinder type rotating wheel concentration device, part of the purified gas is discharged by the exhaust funnel 7, the other part of the purified gas is extracted by the desorption fan 3 and is divided into two parts, one of the high-temperature gases enters a heat exchanger 4 and is subjected to heat exchange with part of high-temperature gas extracted from a combustion chamber in a heat accumulating type oxidation device 5, the heated and heated gas and the other purified gas controlled by a regulating valve 8 are combined to be used as desorption hot gas, the desorption hot gas passes through a desorption gas inlet in a cylinder type rotating wheel concentration device and enters a zeolite concentration rotating wheel in the cylinder type rotating wheel concentration device, the desorbed gas passes through a desorption gas outlet in the cylinder type rotating wheel concentration device to form desorption gas, and the desorption gas is pressurized by an RTO fan 9, is controlled by a lift valve 6-3 and then enters the heat accumulating type oxidation device 5 for treatment; the left poppet valve 6-3 is opened, the right poppet valve 6-3 is closed, namely the left heat storage bed is used for air admission, the right heat storage bed is used for air outlet, concentrated desorption gas enters the left heat storage bed in the heat storage type oxidation equipment 5 and enters a combustion chamber in the heat storage type oxidation equipment 5 after being heated, a combustor in the heat storage type oxidation equipment 5 supplements fuel to keep the temperature of RTO when being started and in low concentration, gas after oxidation treatment flows out through the right heat storage bed in the heat storage type oxidation equipment 5, the gas after heating a heat storage body is cooled and is discharged through an exhaust funnel 7 after being combined with purified gas after passing through an ac passage in the right poppet valve 6-3 and the right three-way valve 6-2; when the right heat accumulation bed is converted into the return time when the air is discharged, the right three-way valve 6-2 rotates to be communicated with ab, the gas with the untreated waste gas remained in the right heat accumulation bed is returned to the inlet of the air inlet fan 1, and the gas is combined with the organic waste gas and then enters the air inlet fan 1; after the return time is over, the three-way valve 6-2 on the right side rotates to ac communication, and the purified gas is combined with the purified gas through the three-way valve 6-2 on the right side and then discharged through the exhaust funnel 7.
In the embodiment, when ab in the three-way valve 6-2 is communicated, the outlet gas is used as return gas and returns to the inlet of the zeolite rotating wheel concentration equipment 2 for treatment; when the ac in the three-way valve 6-2 is communicated, the outlet gas is taken as purified gas and is discharged to the exhaust funnel 7 through a pipeline.
Example four:
referring to fig. 12, the valve set 6 in this embodiment is formed by combining three poppet valves 6-3, which may be replaced by butterfly valves, and the processing flow of this embodiment is as follows:
the low-concentration organic waste gas is pressurized by the air inlet fan 1 and enters the cylinder type rotating wheel concentration device, the organic matters are adsorbed on the zeolite, the purified gas is discharged from the exhaust port of the cylinder type rotating wheel concentration device, part of the purified gas is discharged by the exhaust funnel 7, the other part of the purified gas is extracted by the desorption fan 3 and is divided into two parts, one of the high-temperature gases enters the heat exchanger 4 and is subjected to heat exchange with the high-temperature gas extracted from the combustion chamber in the heat accumulating type oxidation equipment 5, the heated and heated gas and the other purified gas controlled by the regulating valve 8 are combined to be used as desorption hot gas to pass through a desorption gas inlet in the cylinder type rotating wheel concentration equipment and enter a zeolite concentration rotating wheel in the cylinder type rotating wheel concentration equipment, the desorbed gas passes through a desorption gas outlet in the cylinder type rotating wheel concentration equipment to form desorption gas, and the desorption gas is pressurized by the RTO fan 9 and then enters the heat accumulating type oxidation equipment 5 to be treated after being controlled by the poppet valve 6-3. In the two air inlet poppet valves 6-3-1 used as air inlet, the air inlet poppet valve 6-3-1 on the left side is opened, the air inlet poppet valve 6-3-1 on the right side is closed, namely the heat accumulation bed on the left side is air inlet, the heat accumulation bed on the right side is air outlet, concentrated desorption gas enters the heat accumulation bed on the left side and enters a combustion chamber in the heat accumulation type oxidation equipment 5 after being heated, a combustor in the heat accumulation type oxidation equipment 5 supplements fuel to keep the temperature of RTO (regenerative thermal oxidizer) when being started and in low concentration, the gas after oxidation treatment flows out through the heat accumulation bed on the right side, the gas after heating the heat accumulation body is cooled and is discharged through the air outlet poppet valve 6-3-2 on the right side and is combined; and in the return time when the heat storage bed on the right side is switched to give off gas, the gas outlet poppet valves 6-3-2 on the left side and the right side are both closed, meanwhile, the gas return poppet valves 6-3-3 on the left side are closed, the gas return poppet valves 6-3-3 on the right side are opened, the gas with the untreated waste gas remained in the heat storage bed on the right side is returned to the inlet of the gas inlet fan 1, the gas is merged with the organic waste gas and then enters the gas inlet fan, after the return time is over, the gas return poppet valves 6-3-3 on the left side and the right side are both closed, the gas outlet poppet valves 6-3-2 on the right side are opened.
Example five:
referring to fig. 13, in this embodiment, the air return time is equal to the air outlet time, that is, the regenerator outlet air is completely returned to the inlet of the zeolite wheel concentrator 2 for further treatment and is not directly discharged to the exhaust stack 7, and the valve set 6 is formed by combining two poppet valves 6-3, that is, an inlet poppet valve 6-3-1 for inlet air and an return poppet valve 6-3-3 for return air, and the treatment process of this embodiment is as follows:
the low-concentration organic waste gas is pressurized by the air inlet fan 1 and enters the cylinder type rotating wheel concentration device, the organic matters are adsorbed on the zeolite, the purified gas is discharged from the exhaust port of the cylinder type rotating wheel concentration device, part of the purified gas is discharged by the exhaust funnel 7, the other part of the purified gas is extracted by the desorption fan 3 and is divided into two parts, one of the high-temperature gases enters the heat exchanger 4 and is subjected to heat exchange with the high-temperature gas extracted from the combustion chamber in the heat accumulating type oxidation equipment 5, the heated and heated gas and the other purified gas controlled by the regulating valve 8 are combined to be used as desorption hot gas to pass through a desorption gas inlet in the cylinder type rotating wheel concentration equipment and enter a zeolite concentration rotating wheel in the cylinder type rotating wheel concentration equipment, the desorbed gas passes through a desorption gas outlet in the cylinder type rotating wheel concentration equipment to form desorption gas, and the desorption gas is pressurized by the RTO fan 9 and then enters the heat accumulating type oxidation equipment 5 to be treated after being controlled by the poppet valve 6-3. In the two air inlet poppet valves 6-3-1 used as air inlet, the air inlet poppet valve 6-3-1 on the left side is opened, the air inlet poppet valve 6-3-1 on the right side is closed, namely the heat accumulation bed on the left side is air inlet, the heat accumulation bed on the right side is air outlet, concentrated desorption gas enters the heat accumulation bed on the left side and enters a combustion chamber in the heat accumulation type oxidation equipment 5 after being heated, a combustor in the heat accumulation type oxidation equipment 5 supplements fuel to keep the temperature of RTO when being started and in low concentration, and the gas after oxidation treatment flows out through the heat accumulation bed on the right side and enters the zeolite runner concentration equipment 2 after being converged with organic waste gas through the air return poppet valve 6-3-3 on the right. When the heat storage bed on the left side is air inlet and the heat storage bed on the right side is air outlet, the air return poppet valve 6-3-3 on the right side is opened, and the air return poppet valve 6-3-3 on the left side is closed; when the left heat storage bed is in an air outlet state and the right heat storage bed is in an air inlet state, the air return poppet valve 6-3-3 on the right side is closed, and the air return poppet valve 6-3-3 on the left side is opened. The valve group 6 can also be formed by combining two butterfly valves.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (5)
1. The organic waste gas treatment process combining runner concentration and thermal storage oxidation is characterized in that: organic waste gas is pumped into a zeolite rotating wheel concentration device (2) through an air inlet fan (1) for purification treatment, part of purified gas after purification treatment is discharged through an exhaust funnel (7), the other part of gas after purification treatment is pumped and divided into two parts through a desorption fan (3), one part of purified gas enters a heat exchanger (4) and exchanges heat with part of high-temperature gas extracted from a heat accumulating type oxidation device (5), the cooled high-temperature gas after heat exchange is discharged through the exhaust funnel (7), the heated one part of purified gas after heat exchange is merged with the other part of purified gas discharged from a regulating valve (8) connected to a shunt pipeline and enters the zeolite rotating wheel concentration device (2) for treatment to form desorption gas, and an RTO fan (9) pumps the desorption gas to a valve group (6) connected below each heat accumulating bed in the heat accumulating type oxidation device (5), and the gas after oxidation treatment is switched by the valve group (6), partially returned and partially discharged or totally returned to the air inlet end of the air inlet fan (1), mixed with organic waste gas and then enters the zeolite rotating wheel concentration equipment again for purification treatment.
2. The combined rotary concentrating and regenerative thermal oxidation organic waste gas treatment process according to claim 1, wherein: the valve set (6) is a three-way poppet valve (6-1), a first port of the three-way poppet valve (6-1) is connected with an outlet end of an RTO fan (9), a second port of the three-way poppet valve (6-1) is connected with an inlet end of a heat storage bed of the heat storage type oxidation equipment (5), and a third port of the three-way poppet valve (6-1) is connected with an inlet end of an air inlet fan (1).
3. The combined rotary concentrating and regenerative thermal oxidation organic waste gas treatment process according to claim 1, wherein: the valve group (6) is formed by combining three-way valves (6-2) and poppet valves (6-3), each valve group (6) comprises one poppet valve (6-3) and one three-way valve (6-2), wherein a first port of the poppet valve (6-3) is connected with the outlet end of an RTO (regenerative thermal oxidizer) fan (9), a second port of the poppet valve (6-3) is respectively connected with the inlet end of a heat storage bed of the heat storage type oxidation equipment (5) and the first port of the three-way valve (6-2), a second port of the three-way valve (6-2) is connected with the inlet end of an air inlet fan (1), and a third port of the three-way valve (6-2) is connected with the inlet end of an exhaust barrel (7).
4. The combined rotary concentrating and regenerative thermal oxidation organic waste gas treatment process according to claim 1, wherein: the valve group (6) is formed by combining a plurality of poppet valves (6-3), each valve group (6) comprises three poppet valves (6-3) which are respectively used as an air inlet poppet valve (6-3-1), an air outlet poppet valve (6-3-2) and an air return poppet valve (6-3-3), a first port of the air inlet poppet valve (6-3-1) is connected with an outlet end of an RTO (regenerative thermal oxidizer) fan (9), and a second port of the air inlet poppet valve (6-3-1) is respectively connected with a heat accumulation bed inlet end of a heat accumulation type oxidation device (5), a first port of the air outlet poppet valve (6-3-2) and a first port of the air return poppet valve (6-3-3); the second port of the air outlet poppet valve (6-3-2) is connected with the inlet end of the exhaust cylinder (7), and the second port of the air return poppet valve (6-3-3) is connected with the inlet end of the air inlet fan (1).
5. The combined rotary concentrating and regenerative thermal oxidation organic waste gas treatment process according to claim 1, wherein: the number of the heat storage beds in the heat storage type oxidation equipment (5) is even.
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