CN212283236U - Organic waste gas catalytic combustion processing system - Google Patents
Organic waste gas catalytic combustion processing system Download PDFInfo
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- CN212283236U CN212283236U CN202022019954.0U CN202022019954U CN212283236U CN 212283236 U CN212283236 U CN 212283236U CN 202022019954 U CN202022019954 U CN 202022019954U CN 212283236 U CN212283236 U CN 212283236U
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Abstract
The utility model discloses an organic waste gas catalytic combustion treatment system, wherein the treatment system comprises a pretreatment device, a dry filter and modular filter cotton arranged in the dry filter; the air inlet end of the adsorption device is connected with the air outlet end of the dry filter through a pipeline, and the air outlet end of the adsorption device is connected with the atmosphere; the desorption device is connected with the adsorption device and is used for desorbing the saturated adsorption device; catalytic combustion device, including heat exchanger and heating system, desorption device's exhaust end links to each other with heat exchanger through the pipeline, and heat exchanger's an exhaust end links to each other with heating system through the pipeline, and heating system's exhaust end is through the pipeline reentrant heat exchanger in carrying out the heat transfer cooling, and another exhaust end of heat exchanger links to each other with the atmosphere through the pipeline that is connected with the draught fan. The utility model discloses can improve exhaust-gas treatment efficiency, it is extravagant to reduce the energy simultaneously.
Description
Technical Field
The utility model relates to an organic waste gas handles the field, especially relates to an organic waste gas catalytic combustion processing system.
Background
At present, in industrial production, a large amount of solvents are consumed in a plurality of industries related to chemical use, most of the consumed solvents are organic substances with low boiling points and high volatility, organic waste gas is formed after volatilization, the organic waste gas generally has the characteristics of flammability, explosiveness, toxicity, harmfulness, large processing difficulty, high degree of harm and the like, and the leakage or random discharge can bring serious damage to the surrounding environment.
The waste gas is treated by generally adopting an activated carbon adsorption device in the industry, but the adsorption capacity of activated carbon is limited, and after the activated carbon is adsorbed and saturated, the adsorption capacity is reduced, so that the waste gas treatment efficiency is influenced. After the activated carbon is adsorbed to saturation, the activated carbon can be regenerated through desorption and desorption, and can be recycled, so that the service life is prolonged. After the exhaust gas is desorbed, several treatment methods such as catalytic combustion, direct combustion, condensation recovery and the like are usually adopted, the direct catalytic combustion can cause energy waste, and the safety is poor due to overhigh outlet temperature.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to provide an organic waste gas catalytic combustion treatment system, which can improve the waste gas treatment efficiency and reduce the energy waste.
The purpose of the utility model is realized by adopting the following technical scheme:
an organic exhaust gas catalytic combustion treatment system comprising:
the pretreatment device comprises a dry filter, and modular filter cotton is arranged in the dry filter;
the air inlet end of the adsorption device is connected with the air outlet end of the dry filter through a pipeline, and the air outlet end of the adsorption device is connected with the atmosphere;
the desorption device is connected with the adsorption device and is used for desorbing the saturated adsorption device;
catalytic combustion device, including heat exchanger and heating system, desorption device's exhaust end via-line with heat exchanger links to each other, heat exchanger's an exhaust end via-line with heating system links to each other, heating system's exhaust end via-line reengages carry out the heat transfer cooling in the heat exchanger, another exhaust end of heat exchanger links to each other with the atmosphere through the pipeline that links to each other with the draught fan.
Further, it includes a plurality of metal net racks of setting for the size and establishes to filter pulp filter material in the metal net rack, it is a plurality of the metal net rack splices each other and forms modular structure, filter material is for adopting synthetic fiber non-woven fabrics and aluminium complex to make the fold form.
Further, the device also comprises a PLC control system which is communicated with the pretreatment device, the adsorption device, the desorption device, the catalytic combustion device and the induced draft fan through signals.
Furthermore, the dry filter is provided with a resistance detection device connected with the PLC control system, and a detection probe of the resistance detection device is connected with the filter cotton of the dry filter and used for detecting the resistance value of the filter cotton so as to determine the adsorption saturation.
Furthermore, the adsorption device is an activated carbon adsorption box with a honeycomb activated carbon layer, and the thickness of the adsorption box is 500-600 cm; and a temperature probe connected with the PLC control system is arranged in the adsorption device and used for detecting the internal temperature of the adsorption device.
Further, be equipped with a plurality of activated carbon layers in the activated carbon adsorption case, the space between the adjacent activated carbon layer is for filtering the passageway, the air inlet and the gas vent of activated carbon adsorption case are established respectively and are filtered the passageway and correspond adjacent on activated carbon adsorption case's the lateral wall, make during gas lets in arbitrary filtration passageway from the air inlet and get into adjacent another filtration passageway behind the activated carbon layer, discharge in the gas vent that should filter the passageway and correspond again.
Furthermore, the heating system comprises a preheating chamber, a heating chamber and a catalytic chamber provided with a catalyst, wherein the air inlet end of the preheating chamber is connected with the air exhaust end of the heat exchanger, the air exhaust end of the preheating chamber is sequentially connected with the heating chamber and the catalytic chamber, and the air exhaust end of the catalytic chamber returns to the heat exchanger through a pipeline for heat exchange and cooling.
Furthermore, be equipped with in the catalysis room with the temperature probe that PLC control system links to each other for detect reaction temperature in the catalysis room, and the inlet end of catalysis room be equipped with the continuous tonifying cold valve of PLC control system, it is right to open when reaction temperature surpasss and sets for the upper limit the tonifying cold valve the catalysis room cools down.
Further, flame arresters are arranged at the air inlet end and the air outlet end of the catalytic chamber.
Compared with the prior art, the beneficial effects of the utility model reside in that:
adsorbing and filtering the waste gas by using an adsorption device; when the adsorption capacity of the adsorption device reaches a saturated state, the desorption device is used for desorbing the adsorption device, so that the adsorption capacity of the adsorption device is recovered, and the service life is prolonged; meanwhile, desorbed gas is decomposed through catalytic combustion, heat generated by combustion is recycled, energy waste is reduced, and waste gas treatment efficiency can be improved.
Drawings
FIG. 1 is a schematic view of the connection of an apparatus of a catalytic combustion treatment system for organic waste gas according to an embodiment of the present invention;
fig. 2 is a schematic view of an internal structure of an activated carbon adsorption tank according to a first embodiment of the present invention;
fig. 3 is a schematic connection diagram of a catalytic combustion apparatus according to an embodiment of the present invention.
In the figure: 1. a dry filter; 2. an activated carbon adsorption tank; 201. a first filtration channel; 202. a second filtration channel; 203. a third filtration channel; 21. a first air inlet; 22. a first exhaust port; 23. a second exhaust port; 24. a first activated carbon layer; 25. a second activated carbon layer; 3. a catalytic combustion device; 31. a heat exchanger; 32. a heating system; 4. an induced draft fan; 5. a flame arrestor; 6. and (4) a PLC control system.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.
Example one
The embodiment provides an organic waste gas catalytic combustion processing system, which is shown in fig. 1 and comprises a pretreatment device, an adsorption device, a catalytic combustion device 3, an induced draft fan 4 and a PLC control system 6.
The pretreatment device is set as a dry filter 1, organic waste gas is sent into the dry filter 1, impurities such as dust and paint mist can be filtered, the pretreatment device comprises at least two sequentially connected dry filters 1 in the embodiment, and the organic waste gas is subjected to secondary filtration, so that the blockage of activated carbon micropores in a subsequent absorption device is avoided, and the service life of the activated carbon is ensured.
Be equipped with the modular filter pulp of polylith in the dry filter 1, wherein the filter pulp includes a plurality of metal net racks of setting for the size and establishes every filtering material in the metal net rack will filter the cotton and divide into a plurality of modules through a plurality of metal net racks, and the modular filter pulp is installed in the metal box after splicing each other, and the flexibility is high, but the periodic replacement.
The filtering material in the metal net rack is made into a fold shape by adopting a synthetic fiber non-woven fabric and an aluminum compound, and has the characteristics of large ventilation volume, small resistance, large dust holding capacity, low replacement cost and the like. In the actual use process, different grades of filter cotton can be added according to the actual situation, and the filter cotton is generally G3/F5/F8 and the like. The filter cotton formed by compounding the multiple layers of glass fibers has the density gradually increased along with the thickness, so that the multiple layers of fibers have the effects of intercepting, colliding, diffusing, absorbing and the like on micro particles during filtering, and dust particles are contained in the material when waste gas passes through the filter cotton, so that the filter effect is achieved.
The dry filter 1 is provided with a resistance detection device connected with the PLC control system 6, a detection probe of the resistance detection device is connected with the filter cotton of the dry filter 1, and as the filter cotton adsorbs more dust particles, the resistance of the filter cotton is increased, so that the adsorption saturation of the filter cotton can be determined by detecting the resistance value of the filter cotton; the resistance detection device detects a data transmission value in the PLC control system 6, and when the resistance is detected to reach a set value, the PLC control system 6 can send an alarm instruction to the connected alarm system to remind a worker to replace the filter cotton.
The exhaust end of the dry filter 1 is connected with the air inlet end of the adsorption device through a pipeline, so that the filtered organic waste gas enters the adsorption device. In this embodiment, adsorption equipment establishes to active carbon adsorption case 2, is equipped with the honeycomb activated carbon layer in the active carbon adsorption case 2, and the activated carbon layer has a large amount of micropores, and this active carbon specific surface area and porosity are big, and adsorption efficiency is strong, has better mechanical strength, chemical stability and thermal stability, and purification efficiency is up to 85%.
In this embodiment, the pipeline that links to each other with the air inlet of activated carbon adsorption case 2 is connected many and is divided the pipe, correspondingly, activated carbon adsorption case 2 is equipped with a plurality of air inlets and a plurality of gas vent, and a plurality of air inlets are located respectively on the different heights in activated carbon adsorption case 2 for the gas dispersion that the exhaust end through dry filter 1 was exported is in the different air inlets of activated carbon adsorption case 2. And be equipped with a plurality of filtration passageways in the activated carbon adsorption case 2, multilayer activated carbon layer has arranged in proper order from the top down in the activated carbon adsorption case 2, and the space is a filtration passageway between the adjacent activated carbon layer, and every filtration passageway all corresponds to there is an air inlet and gas vent, just the position of the air inlet that every filtration passageway corresponds and gas vent misplaces each other in activated carbon adsorption case 2, and every filtration passageway's air inlet and gas vent are located the upper and lower side on activated carbon layer respectively promptly for gas must can pass through activated carbon layer in order to realize the filter effect at the exhaust in-process.
In this embodiment, as shown in fig. 2, two activated carbon layers are disposed in the activated carbon adsorption tank 2, wherein a space between the first activated carbon layer 24 and the top surface of the activated carbon adsorption tank 2 is a first filtering channel 201, a space between the first activated carbon layer 24 and the second activated carbon layer 25 is a second filtering channel 202, a space between the second activated carbon layer 25 and the bottom surface of the activated carbon adsorption tank 2 is a third filtering channel 203, wherein a first air inlet 21 is disposed between the first activated carbon layer 24 and the second activated carbon layer 25 on the sidewall of the activated carbon adsorption tank 2, a first air outlet 22 is disposed between the first activated carbon layer 24 and the sidewall of the adsorption tank between the top surface of the activated carbon adsorption tank 2, and a second air outlet 23 is disposed between the second activated carbon layer 25 and the sidewall of the adsorption tank 2, so that the gas entering the second filtering channel 202 from the first air inlet 21 passes through the first activated carbon layer 24 and the second activated carbon layer 2 respectively 25 into the first filtering channel 201 and the third filtering channel 203, and then discharged through the first exhaust port 22 and the second exhaust port 23, respectively, thereby increasing the efficiency of gas filtering.
Meanwhile, each layer of the activated carbon layer at least comprises two layers of filtering structures, the aperture of one surface of each layer of the activated carbon layer, which is used for air inlet, is relatively large, and activated carbon particles with relatively large volume can be filled in the aperture for primarily purifying the air which is used for air inlet; the aperture of the surface of each active carbon layer used for exhausting is relatively small, and the aperture of the surface with the relatively small aperture is filled with active carbon powder, so that the gas can be further purified when passing through the active carbon powder, and the filtering and purifying effect of the gas is improved.
In order to further improve the filtering effect, an air equalizer is arranged in the activated carbon adsorption box 2, so that the waste gas can be ensured to uniformly pass through the activated carbon layer; in addition, the heat-insulating layer is arranged on the activated carbon adsorption box 2, so that the temperature rise in the activated carbon adsorption box 2 during desorption can be rapidly promoted; in the embodiment, the thickness of the heat-preserving layer is 100mm, so that the temperature of the outer surface of the furnace body is less than or equal to the ambient temperature plus 30 ℃, and personnel can be prevented from being scalded.
The activated carbon adsorption box 2 is internally provided with a temperature probe connected with the PLC control system 6 and used for detecting the internal temperature of the adsorption device, and the internal temperature is monitored in real time to maintain the internal temperature within 100 ℃, so that the risk coefficient is reduced to the minimum. If the temperature abnormal condition appears, PLC control system 6 is automatic in time to be closed the valve at 2 both ends of active carbon adsorption case, prevents that the intensity of a fire from stretching, starts the inside fire extinguishing system that sprays of active carbon adsorption case 2 simultaneously to put out the source of a fire.
In order to improve the purification efficiency of the activated carbon, the airspeed of the activated carbon adsorption tank 2 is set to be 0.8-1.0m/s, and meanwhile, the thickness of the activated carbon layer is set to be 500-600cm, so that the retention time of the waste gas between the activated carbon layers is ensured, and the purification efficiency of the activated carbon is ensured.
The activated carbon adsorption box 2 is also connected with a desorption device which can be an activated carbon adsorber and can desorb saturated activated carbon to desorb organic matters from the activated carbon; in the desorption process, the organic waste gas is concentrated, the concentration is improved by several times to dozens of times compared with the original concentration and reaches more than 1500ppm, the concentrated waste gas is sent to the catalytic combustion device 3 through a pipeline and finally decomposed into CO2And H2And discharging the O.
Referring to fig. 3, the catalytic combustion device 3 includes a heat exchanger 31 and a heating system 32, the exhaust end of the adsorption device is connected to the heat exchanger 31 through a pipeline, the exhaust end of the heat exchanger 31 is connected to the heating system 32 through a pipeline, the exhaust end of the heating system 32 is connected to the heat exchanger 31 through a pipeline for heat exchange and cooling, and the other exhaust end of the heat exchanger 31 is connected to the atmosphere through a pipeline.
The organic waste gas enters the heat exchanger 31, is heated for the first time, enters the heating system 32, is heated to the temperature required by catalytic combustion, and then is subjected to catalytic combustion. In the present embodiment, the heating system 32 includes a preheating chamber, a heating chamber and a catalytic chamber provided with a catalyst, an air inlet end of the preheating chamber is connected with an air outlet end of the heat exchanger 31, and the heat exchanger 31 provides a preheating temperature for the preheating chamber; the exhaust end of the preheating chamber is sequentially connected with the heating chamber and the catalytic chamber, organic waste gas subjected to first temperature rise enters the heating chamber and then is continuously heated to the initial temperature required by catalytic combustion, and then the organic waste gas enters the catalytic chamber for combustion.
The catalyst is arranged in the catalyst chamber, and under the action of the catalyst, the initial temperature of the catalytic combustion method for the combustion of the waste gas is about 250-. The organic waste gas can be flameless combusted under the condition of lower ignition temperature by the aid of the catalyst, and is oxidized and decomposed into CO2 and H2O, and simultaneously, a large amount of heat energy is released, so that the method for removing harmful substances in the waste gas is achieved. The reaction process is as follows:
meanwhile, under the action of the activity of the catalyst, the reacted gas generates certain heat, so that the exhaust end of the catalytic chamber returns to the heat exchanger 31 through a pipeline for heat exchange and cooling, the high-temperature gas enters the heat exchanger 31 again, is subjected to heat exchange and cooling, and is finally exhausted into the atmosphere at a lower temperature through a fan, and the heat obtained by exchange and conduction can be sent into the preheating chamber by the heat exchanger 31, so that the energy consumption is recycled, and the energy consumption is reduced.
Meanwhile, a temperature probe connected with the PLC control system 6 is arranged in the catalytic chamber and used for detecting the reaction temperature in the catalytic chamber, a cold compensation valve connected with the PLC control system 6 is arranged at the air inlet end of the catalytic chamber, and the cold compensation valve is automatically opened to cool the catalytic chamber when the reaction temperature exceeds a set upper limit; after the temperature is normal, the cold compensation valve is closed again.
In order to improve the flow speed of the organic waste gas, the induced draft fan 4 is arranged in the system, and the induced draft fan 4 is connected with the pipeline, so that the flow speed of the air flow in the whole system is increased, and the treatment efficiency is improved.
The present embodiment takes the paint spraying waste gas as an example, such as 10000m air volume3The exhaust gas component is calculated by toluene and has a concentration of 200mg/m3。
According to formula (1): the dry filter 1 has a filtration area of 1.39 square meters when the square meters are 10000/3600/2 ═ Q/V, but in practice, certain margin needs to be kept, so the filtration area of single-stage filter cotton needs to be more than or equal to 1.39 square meters, the filter cotton adopts a modular structure, the size of each block is 700 × 500 × 50mm, 6 blocks are arranged for each filter cotton, the filtration area is about 2.1 square meters, the dry filter 1 is divided into two-stage filtration, and the filtration grade is G3/F5.
And the space velocity of the activated carbon adsorption box 2 is required to be between 0.8 and 1.0m/s according to the formula (2): filter area, S, Q/V, 10000/3600/1, 2.78 square meters and formula (3): the internal section length L of the filtering and adsorbing box is ═ V (S) ═ V (2.78) ═ 1.67 m; because a certain margin needs to be reserved in practice, the size of the inner section of the activated carbon adsorption box 2 is designed to be 1.7 × 1.7m, the insulating layer is 50mm, the size of the section of the activated carbon adsorption box 2 is 1.8 × 1.8m, and the space velocity of the section is about 0.98 m/s; and the thickness of the activated carbon layer is set to be 500mm, the residence time is 0.51 s.
In addition, the catalytic reaction activation temperature of the toluene is about 220 ℃, and the catalytic combustion model Q is 1000Nm3The heat exchange area is 33 square meters, the electric heating power is 48kw, and the catalyst quantity is 0.09m3The three layers are arranged, and the height of each layer is 100 mm.
Example two
The embodiment provides a method for catalytic combustion treatment of organic exhaust gas, which is applied to the system for catalytic combustion treatment of organic exhaust gas according to the first embodiment, and comprises the following steps:
step S1: sending the organic waste gas into the pretreatment device through a pipeline to filter impurities in the waste gas; the pretreatment device is set as a dry filter 1, organic waste gas is sent into the dry filter 1, impurities such as dust and paint mist can be filtered, the pretreatment device comprises at least two sequentially connected dry filters 1 in the embodiment, and the organic waste gas is subjected to secondary filtration, so that the blockage of activated carbon micropores in a subsequent absorption device is avoided, and the service life of the activated carbon is ensured.
Step S2: will through the pipeline will exhaust organic waste gas sends into among the preprocessing device adsorbs among the absorption device and purifies, absorption device establishes to activated carbon adsorption case 2, is equipped with the honeycomb activated carbon layer in the activated carbon adsorption case 2, and the activated carbon layer has a large amount of micropores, and this activated carbon specific surface area and porosity are big, and adsorption efficiency is strong, has better mechanical strength, chemical stability and thermal stability, and purification efficiency is up to 85%. When the activated carbon adsorption tank 2 is in an unsaturated state, the gas adsorbed by the activated carbon adsorption tank can be directly discharged into the atmosphere.
Step S3: when the adsorption saturation of the activated carbon adsorption box 2 reaches a set value, the desorption device desorbs the saturated activated carbon through hot air flow, and the activated carbon adsorption box 2 after desorption and desorption can be put into use again; and organic waste gas can be concentrated in the desorption process, the concentrated organic waste gas is sent into the catalytic combustion device 3 through a pipeline for combustion and decomposition, high-temperature gas after combustion and decomposition is sent into the heat exchanger 31, heat energy generated in the catalytic process is subjected to heat exchange and cooling by the heat exchanger 31, and the gas can be discharged into the air after the temperature of the gas is reduced to a set range.
The heat exchanger 31 sends the heat obtained by exchange and conduction into the preheating chamber of the heating system 32, so that the temperature in the catalytic combustion device 3 can be supplemented, the energy consumption can be recycled, and the energy consumption can be reduced.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.
Claims (9)
1. An organic exhaust gas catalytic combustion processing system, comprising:
the pretreatment device comprises a dry filter, and modular filter cotton is arranged in the dry filter;
the air inlet end of the adsorption device is connected with the air outlet end of the dry filter through a pipeline, and the air outlet end of the adsorption device is connected with the atmosphere;
the desorption device is connected with the adsorption device and is used for desorbing the saturated adsorption device;
catalytic combustion device, including heat exchanger and heating system, desorption device's exhaust end via-line with heat exchanger links to each other, heat exchanger's an exhaust end via-line with heating system links to each other, heating system's exhaust end via-line reengages carry out the heat transfer cooling in the heat exchanger, another exhaust end of heat exchanger links to each other with the atmosphere through the pipeline that is connected with the draught fan.
2. The system of claim 1, wherein the filter cotton comprises a plurality of metal net frames with predetermined sizes and a filter material disposed in each metal net frame, the plurality of metal net frames are spliced together to form a modular structure, and the filter material is made into a corrugated shape by using a synthetic fiber non-woven fabric and an aluminum composite.
3. The organic waste gas catalytic combustion processing system of claim 1, further comprising a PLC control system in signal communication with the pretreatment device, the adsorption device, the desorption device, the catalytic combustion device, and the induced draft fan.
4. The organic waste gas catalytic combustion processing system as claimed in claim 3, wherein the dry filter is provided with a resistance detection device connected with the PLC control system, and a detection probe of the resistance detection device is connected with the filter cotton of the dry filter for detecting the resistance value of the filter cotton to determine the adsorption saturation.
5. The system for catalytic combustion treatment of organic waste gas according to claim 3, wherein the adsorption device is an activated carbon adsorption tank having a honeycomb activated carbon layer, and the thickness of the adsorption tank is 500-600 cm; and a temperature probe connected with the PLC control system is arranged in the adsorption device and used for detecting the internal temperature of the adsorption device.
6. The organic waste gas catalytic combustion processing system according to claim 5, wherein a plurality of activated carbon layers are provided in the activated carbon adsorption tank, a space between adjacent activated carbon layers is a filtering channel, and an air inlet and an air outlet of the activated carbon adsorption tank are respectively provided on a side wall of the activated carbon adsorption tank corresponding to the adjacent filtering channel, so that when air is introduced into any filtering channel from the air inlet, the air passes through the activated carbon layer and then enters another adjacent filtering channel, and then the air is discharged from the air outlet corresponding to the filtering channel.
7. The system of claim 3, wherein the heating system comprises a preheating chamber, a heating chamber and a catalyst chamber with a catalyst, an air inlet end of the preheating chamber is connected with an air outlet end of the heat exchanger, an air outlet end of the preheating chamber is connected with the heating chamber and the catalyst chamber in sequence, and an air outlet end of the catalyst chamber is returned to the heat exchanger for heat exchange and cooling through a pipeline.
8. The organic waste gas catalytic combustion processing system of claim 7, wherein a temperature probe connected to the PLC control system is disposed in the catalytic chamber for detecting the reaction temperature in the catalytic chamber, a cold compensation valve connected to the PLC control system is disposed at the air inlet end of the catalytic chamber, and the cold compensation valve is opened to cool the catalytic chamber when the reaction temperature exceeds a predetermined upper limit.
9. The catalytic combustion treatment system for organic waste gas as claimed in claim 8, wherein the catalytic chamber is provided with flame arresters at both the inlet end and the outlet end.
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