CN212227064U - Catalytic combustion device for VOC (volatile organic compound) waste gas treatment in coking industry - Google Patents
Catalytic combustion device for VOC (volatile organic compound) waste gas treatment in coking industry Download PDFInfo
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Abstract
The utility model provides a catalytic combustion device is used in coking industry VOC exhaust-gas treatment, the device includes the casing set gradually pretreatment chamber, heat transfer chamber and catalytic combustion room by one end to the other end in the casing be provided with oxygen air feeder outside the casing, wherein be provided with the filter in the pretreatment chamber be provided with many first heat exchange tubes in the heat transfer chamber, be filled with the catalyst in the catalytic combustion chamber, by first heat exchange tube is carried treat handle the gas and by the oxygen that oxygen air feeder provided is in under the effect of catalyst catalytic combustion reaction is carried out in the catalytic combustion chamber, treat the gas and be turned into catalytic combustion gas production in the catalytic combustion chamber. Utilize the device can carry out catalytic combustion to the pending gas that contains VOC waste gas and handle, the energy consumption is low, and the treatment effeciency is high, and catalytic combustion conversion is high, can also prevent that the filter from blockking up, increases operation rate.
Description
Technical Field
The utility model relates to a volatile organic compounds handles technical field, in particular to catalytic combustion device for coking industry VOC exhaust-gas treatment.
Background
The coking industry is an important component of the coal chemical industry and has important significance for the development of national economy. In the production process of the coking industry, a lot of links generate a large amount of waste gas containing Volatile Organic Compounds (VOC), and if the waste gas is directly discharged, the waste gas can cause serious harm to the environment and also can cause damage to human bodies, the content and concentration of VOC in the air are increased, symptoms such as convulsion, headache, coma, nausea and the like can be caused, brain, kidney, liver and the like of a nervous system are damaged, and irritation toxicity and carcinogenesis are accompanied, so that the treatment of the VOC waste gas in the coking industry is greatly concerned.
At present, the treatment mode of the VOC waste gas is mainly divided into recovery treatment and destruction treatment, wherein the recovery treatment mainly comprises absorption, filtration, separation or enrichment of the discharged VOCs by physical methods such as adsorption, absorption, condensation, membrane separation and the like, and then purification and resource recycling are carried out. The destroying technology comprises direct combustion, catalytic combustion, photocatalytic oxidation, biological oxidation, low-temperature plasma and integrated technology thereof, and mainly decomposes and converts the discharged VOCs into other nontoxic and harmless substances by chemical or biochemical reaction and the like by using heat, light, electricity, catalysts or microorganisms. The catalytic combustion is a method for generating gases such as carbon dioxide, water and the like without pollution to the environment by using a catalyst to enable organic volatile matters in the waste gas to be subjected to oxidation reaction with oxygen at a lower temperature, and has the advantages of low ignition temperature, high treatment efficiency, no secondary pollution and the like.
The catalytic combustion treatment is usually carried out by filling a catalyst in a fixed bed reactor, introducing exhaust gas into the reactor by a fan to complete catalytic oxidation, and discharging the treated gas. However, the existing catalytic combustion treatment device still has some problems: the catalytic combustion is an exothermic reaction, and the generated heat is not effectively utilized, so that waste heat is wasted; a small amount of harmful gas still exists in the catalytic combustion products, the conversion rate of catalytic combustion still needs to be improved, and the catalytic efficiency is reduced because the VOC waste gas contains a small amount of substances such as tar, dust, lead compounds and the like, which easily poisons the catalyst.
In view of the above, there is a need for a catalytic combustion apparatus for VOC exhaust gas treatment in the coking industry to solve the problems of high energy consumption and low treatment efficiency existing in the prior art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a catalytic combustion device is used in coking industry VOC exhaust-gas treatment utilizes the device can carry out catalytic combustion to the pending gas that contains VOC waste gas and handles, and the energy consumption is low, and the treatment effeciency is high, and catalytic combustion conversion is high, can also prevent that the filter from blockking up, increases operation rate.
In order to achieve the above object, the present invention provides the following technical solutions:
a catalytic combustion device for VOC waste gas treatment in the coking industry comprises a shell, wherein one end of the shell is provided with a gas inlet to be treated, a pretreatment chamber, a heat exchange chamber and a catalytic combustion chamber are sequentially arranged from one end to the other end in the shell, an oxygen supply device is arranged outside the shell, a filter is arranged in the pretreatment chamber, the gas inlet side of the filter faces the gas inlet to be treated, the filter can intercept catalyst poisons in the gas to be treated, a plurality of first heat exchange tubes are arranged in the heat exchange chamber and used for conveying the gas to be treated to the catalytic combustion chamber, one ends of the first heat exchange tubes are communicated with the gas outlet side of the filter, the other ends of the first heat exchange tubes are communicated with the gas inlet of the catalytic combustion chamber, the catalytic combustion chamber is internally filled with a catalyst, an air inlet of the catalytic combustion chamber is communicated with an outlet of an oxygen gas supply device, the gas to be treated is conveyed by the first heat exchange tube, the oxygen provided by the oxygen gas supply device is in catalytic combustion reaction in the catalytic combustion chamber under the action of the catalyst, the gas to be treated is converted into catalytic combustion gas in the catalytic combustion chamber, an air outlet of the catalytic combustion chamber is communicated with the heat exchange chamber, the catalytic combustion gas is generated by the gas outlet of the catalytic combustion chamber, enters the heat exchange chamber and exchanges heat with the gas to be treated in the first heat exchange tube, the gas to be treated enters the catalytic combustion chamber after being preheated, and the heat exchange chamber is provided with a catalytic combustion gas generation outlet.
Further, in foretell catalytic combustion device for VOC exhaust-gas treatment in coking industry still be provided with many second heat exchange tubes in the heat transfer chamber, the second heat exchange tube be used for to catalytic combustion chamber carries oxygen, many the one end of second heat exchange tube with all with the export intercommunication of oxygen gas supply installation, many the other end of second heat exchange tube all with catalytic combustion chamber's air inlet intercommunication, oxygen in the second heat exchange tube with the gas is produced in the catalytic combustion carries out the heat transfer in the heat transfer chamber.
Further, in the catalytic combustion device for VOC waste gas treatment in the coking industry, a buffer chamber is further arranged between the heat exchange chamber and the catalytic combustion chamber, an outlet of the buffer chamber is communicated with an air inlet of the catalytic combustion chamber, the other end of the first heat exchange tube and the other end of the second heat exchange tube are both communicated with an inlet of the buffer chamber, and oxygen and the gas to be treated are mixed in the buffer chamber.
Further, in foretell coking industry VOC for waste gas treatment catalytic combustion device, the pre-treatment chamber with be provided with first lateral wall between the heat transfer chamber, the heat transfer chamber with be provided with the second lateral wall between the buffer chamber, the buffer chamber with be provided with the third lateral wall between the catalytic combustion chamber, the one end of first heat exchange tube with first lateral wall is connected the other end of first heat exchange tube with the second lateral wall is connected, the one end of second heat exchange tube with first lateral wall is connected the other end of second heat exchange tube with the second lateral wall is connected.
Further, in the catalytic combustion device for VOC exhaust gas treatment in the coking industry, an ash collecting tank is arranged at the bottom of the pretreatment chamber, the ash collecting tank is located at the air inlet side of the filter, a back-blowing pipeline is further arranged at the air outlet side of the filter, gas can be blown into the filter through the back-blowing pipeline for back-blowing, and catalyst poisons trapped by the filter are blown down into the ash collecting tank.
Further, in the catalytic combustion device for VOC waste gas treatment in the coking industry, the device further comprises a gas distributor, wherein a gas inlet of the gas distributor is communicated with a gas outlet of the catalytic combustion chamber, a gas outlet of the gas distributor is communicated with the heat exchange chamber, the gas outlet of the gas distributor and the gas outlet of the catalytic combustion gas are respectively positioned at two ends of the heat exchange chamber, and the gas outlet of the gas distributor fully covers one end of the heat exchange chamber.
Further, in the catalytic combustion device for treating VOC exhaust gas in the coking industry, the catalyst forms a honeycomb catalyst bed in the catalytic combustion chamber.
Further, in the catalytic combustion device for treating the VOC waste gas in the coking industry, the first heat exchange tube and the second heat exchange tube are arranged in parallel with the axis of the shell.
Further, in foretell catalytic combustion device for coking industry VOC exhaust-gas treatment, the vertical cross-section of casing is circular, in same vertical cross-section by circular shape circumference has set gradually many circles to the centre of a circle first heat exchange tube and many circles the second heat exchange tube, every circle first heat exchange tube and every circle the second heat exchange tube interval sets up, in every circle first heat exchange tube with the second heat exchange tube evenly sets up.
Further, in the catalytic combustion device for VOC exhaust gas treatment in the coking industry, the vertical cross section of the housing is rectangular, multiple rows of the first heat exchange tubes and multiple rows of the second heat exchange tubes are sequentially arranged from any one side to an opposite side of the rectangle in the same vertical cross section, each row of the first heat exchange tubes and each row of the second heat exchange tubes are arranged at intervals, and the first heat exchange tubes and the second heat exchange tubes in each row are uniformly arranged.
The analysis can know, the utility model discloses a catalytic combustion device is used in coking industry VOC exhaust-gas treatment, the device includes the casing, the pre-treatment chamber has set gradually in the casing, heat transfer room and catalytic combustion room, treat that treatment gas (the waste gas that contains VOC) is to tar in the pre-treatment chamber, catalyst poison prefilter such as dust and lead compound, prevent catalyst poisoning, increase catalyst life-span, the treatment effeciency is improved, set up first heat exchange tube and second heat exchange tube in the heat transfer chamber, treat that the catalytic combustion who forms after the treatment gas is handled and accomplish produces the gas and carry out the heat transfer with treatment gas and oxygen in the heat transfer chamber, effectively utilize the waste heat of the gas production of catalytic combustion, and make treatment gas and oxygen preheated by preliminary, reduce the energy consumption.
The gas generated by catalytic combustion and the gas to be treated and the oxygen in the heat exchange chamber are subjected to tubular heat exchange, so that the heat exchange area is increased, the heat exchange efficiency is improved, the gas generated by catalytic combustion and the gas to be treated and the oxygen are further designed into a countercurrent mode, the heat exchange efficiency between the gases is further improved, and the waste heat generated by the gas generated by catalytic combustion is fully utilized.
The gas to be treated and the oxygen firstly enter the buffer chamber for preliminary mixing, so that the two gases are uniformly mixed before entering the catalytic combustion chamber, and the gas to be treated and the oxygen are mixed according to a selected proportion, so that the catalytic combustion conversion rate is improved.
After a certain time of treatment, the back-flushing pipeline can be opened to carry out back flushing on the filter, so that part of particles intercepted on the filter are blown off, the filter is prevented from being blocked in a short time, and the utilization rate is improved.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. Wherein:
fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic longitudinal sectional view of a heat exchange chamber according to an embodiment of the present invention.
Description of reference numerals: 1, a shell; 2, a pretreatment chamber; 3, a heat exchange chamber; 4 a catalytic combustor; 5 gas inlet to be treated; 6, a filter; 7 catalyst bed layer; 8, a first heat exchange tube; 9 oxygen supply device; 10 catalytic combustion gas outlet; 11 a second heat exchange tube; 12 a buffer chamber; 13 a first side wall; 14 a second side wall; 15 a third side wall; 16, back flushing the pipeline; 17, an ash collecting tank; 18 gas distributor.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. Each example is provided by way of explanation of the invention and not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and equivalents thereof.
In the description of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. The terms "connected", "connected" and "disposed" used in the present invention should be understood in a broad sense, and may be, for example, either fixedly connected or detachably connected; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
As shown in fig. 1 and 2, according to the embodiment of the utility model, a catalytic combustion device for the treatment of VOC exhaust gas in the coking industry is provided, the exhaust gas that contains VOC is the gas to be treated, as shown in fig. 1, the device includes a housing 1, one end of the housing 1 is provided with the gas inlet 5 of treating, a pretreatment chamber 2, a heat exchange chamber 3 and a catalytic combustion chamber 4 are arranged in the housing 1 in sequence from one end to the other end, an oxygen gas supply device 9 is arranged outside the housing 1, wherein, a filter 6 is arranged in the pretreatment chamber 2, the gas inlet 5 of the filter 6 is faced to the gas inlet 5 of treating, the filter 6 can intercept catalyst poisons in the gas to be treated (the catalyst poisons are harmful substances that poison the catalyst, which can be tar, dust, lead compounds and the like), the gas inlet 5 of treating is connected with the gas inlet of the filter 6.
A plurality of first heat exchange tubes 8 are arranged in the heat exchange chamber 3, the first heat exchange tubes 8 are used for conveying gas to be treated to the catalytic combustion chamber 4, one ends of the first heat exchange tubes 8 are communicated with the gas outlet side of the filter 6, the other ends of the first heat exchange tubes 8 are communicated with the gas inlet of the catalytic combustion chamber 4, the catalytic combustion chamber 4 is filled with a catalyst, the gas inlet of the catalytic combustion chamber 4 is also communicated with the outlet of an oxygen gas supply device 9, the gas to be treated conveyed by the first heat exchange tubes 8 and the oxygen provided by the oxygen gas supply device 9 are subjected to catalytic combustion reaction in the catalytic combustion chamber 4 under the action of the catalyst, the gas to be treated is converted into catalytic combustion gas in the catalytic combustion chamber 4, the gas outlet of the catalytic combustion chamber 4 is communicated with the heat exchange chamber 3, the catalytic combustion gas enters the heat exchange chamber 3 from the gas outlet of the catalytic combustion chamber 4 and exchanges heat with the gas to be treated in the first, the gas to be treated enters the catalytic combustion chamber 4 after being preheated, and the heat exchange chamber 3 is provided with a catalytic combustion gas production outlet 10.
The gas to be treated (waste gas containing VOC) enters the pretreatment chamber 2 through the gas inlet 5 to be treated, the filter 6 filters catalyst poisons such as tar, dust and lead compounds in the gas to be treated, then the gas to be treated enters the catalytic combustion chamber 4 through the heat exchange chamber 3 through the first heat exchange tube 8, the gas to be treated and oxygen perform catalytic combustion reaction under the action of the catalyst to convert organic matters in the gas to be treated into nontoxic catalytic combustion gas such as carbon dioxide and water, the catalytic combustion gas enters the heat exchange chamber 3 from the gas outlet of the catalytic combustion chamber 4, the catalytic combustion gas exchanges heat with the gas to be treated in the first heat exchange tube 8, the gas to be treated enters the catalytic combustion chamber 4 after being preliminarily preheated to raise the temperature, and the waste heat in the catalytic combustion gas is fully utilized to reduce the energy consumption of the catalytic combustion chamber 4.
Furthermore, a plurality of second heat exchange tubes 11 are further arranged in the heat exchange chamber 3, the second heat exchange tubes 11 are used for conveying oxygen to the catalytic combustion chamber 4, one ends of the plurality of second heat exchange tubes 11 are communicated with an outlet of the oxygen supply device 9, the other ends of the plurality of second heat exchange tubes 11 are communicated with an air inlet of the catalytic combustion chamber 4, and the oxygen in the second heat exchange tubes 11 and the catalytic combustion gas are subjected to heat exchange in the heat exchange chamber 3. The oxygen provided by the oxygen supply device 9 exchanges heat with the catalytic combustion gas production through the second heat exchange tube 11 in the heat exchange chamber 3, the temperature of the oxygen is initially increased, then the oxygen with the increased temperature enters the catalytic combustion chamber 4 to be catalytically combusted with the gas to be treated, the waste heat in the catalytic combustion gas production can be effectively utilized, the oxygen is fully preheated, and the energy consumption of the catalytic combustion chamber 4 is saved.
Further, a buffer chamber 12 is further arranged between the heat exchange chamber 3 and the catalytic combustion chamber 4, an outlet of the buffer chamber 12 is communicated with an air inlet of the catalytic combustion chamber 4, the other end of the first heat exchange tube 8 and the other end of the second heat exchange tube 11 are both communicated with an inlet of the buffer chamber 12, oxygen conveyed by the second heat exchange tube 11 and gas to be treated conveyed by the first heat exchange tube 8 are fully mixed in the buffer chamber 12, and through the arrangement, the oxygen and the gas to be treated can be mixed according to a selected proportion during catalytic combustion reaction, and the conversion rate of catalytic oxidation is improved.
Further, a first side wall 13 is arranged between the pretreatment chamber 2 and the heat exchange chamber 3, a second side wall 14 is arranged between the heat exchange chamber 3 and the buffer chamber 12, a third side wall 15 is arranged between the buffer chamber 12 and the catalytic combustion chamber 4, the first side wall 13, the second side wall 14 and the third side wall 15 divide the shell 1 into the pretreatment chamber 2, the heat exchange chamber 3, the buffer chamber 12 and the catalytic combustion chamber 4 which are sequentially arranged, one end of the first heat exchange tube 8 is connected with the first side wall 13 and communicated with the air outlet side of the filter 6, the other end of the first heat exchange tube 8 is connected with the second side wall 14 and communicated with the buffer chamber 12, one end of the second heat exchange tube 11 is connected with the first side wall 13 and communicated with the outlet of the oxygen supply device 9, and the other end of the second heat exchange tube 11 is connected with the second side wall 14 and communicated with the buffer chamber 12. In the heat exchange chamber 3, the gas generated by catalytic combustion and the gas to be treated in the first heat exchange tube 8 and the oxygen in the second heat exchange tube 11 are in counter flow, so that the heat exchange efficiency is higher, and the waste heat generated by the gas generated by catalytic combustion can be more efficiently utilized.
Furthermore, an ash collecting pool 17 is arranged at the bottom of the pretreatment chamber 2, the ash collecting pool 17 is positioned at the air inlet side of the filter 6, a back-blowing pipeline 16 is also arranged at the air outlet side of the filter 6, air can be blown into the filter 6 through the back-blowing pipeline 16 for back-blowing, and catalyst toxic substances intercepted by the filter 6 are blown into the ash collecting pool 17. After the device is utilized to treat the gas to be treated for a certain time, the gas can be blown in through the back blowing pipeline 16 to back blow the filter 6, and catalyst poisons such as tar, dust, lead compounds and the like intercepted on the filter 6 are blown down into the dust collecting tank 17, so that the pore blockage of the filter 6 is prevented, the service life of the filter 6 is prolonged, and the efficiency of waste gas treatment is improved.
Furthermore, the device also comprises a gas distributor 18, wherein a gas inlet of the gas distributor 18 is communicated with a gas outlet of the catalytic combustion chamber 4, a gas outlet of the gas distributor 18 is communicated with the heat exchange chamber 3, a gas outlet of the gas distributor 18 and the catalytic combustion gas production outlet 10 are respectively positioned at two ends of the heat exchange chamber 3, namely the gas outlet of the gas distributor 18 is positioned at one end of the heat exchange chamber 3 close to the catalytic combustion chamber 4, the catalytic combustion gas production outlet 10 is positioned at one end of the heat exchange chamber 3 close to the pretreatment chamber 2, and the gas outlet of the gas distributor 18 fully covers one end of the heat exchange chamber 3. The gas distributor 18 uniformly distributes the catalytic combustion gas in the heat exchange chamber 3, so that the heat exchange of the first heat exchange tubes 8 and the second heat exchange tubes 11 in the heat exchange chamber 3 is more uniform, and the heat exchange efficiency is further improved. The gas generated by catalytic combustion and the gas to be treated and the oxygen are in counter flow, so that the heat exchange efficiency is higher, and the waste heat can be utilized more efficiently.
Further, the catalyst forms a honeycomb-like catalyst bed 7 in the catalytic combustor 4. The honeycomb catalyst bed layer 7 has larger active specific surface area and higher catalytic efficiency.
Further, the first heat exchange tube 8 and the second heat exchange tube 11 are both arranged in parallel with the axis of the shell 1, and the first heat exchange tube 8 and the second heat exchange tube 11 are both horizontally arranged.
Further, in an embodiment of the utility model, the vertical cross section of casing 1 is circular, has set gradually many circles of first heat exchange tubes 8 and many circles of second heat exchange tubes 11 by circular shape circumference to the centre of a circle in same vertical cross section, and every circle of first heat exchange tubes 8 and every circle of second heat exchange tubes 11 interval set up, and every circle of interior first heat exchange tubes 8 and the even setting of second heat exchange tubes 11. By the arrangement, gas generated by catalytic combustion in the heat exchange chamber 3 and pretreatment gas and oxygen can be subjected to tube type heat exchange in the heat exchange chamber 3, so that the heat exchange area is increased, the heat exchange of the first heat exchange tube 8 and the second heat exchange tube 11 is more uniform, and the heat exchange efficiency is further improved.
In an embodiment of the present invention, as shown in fig. 2, the vertical cross section of the casing 1 is circular, the first heat exchange tube 8 is provided with two circles in the heat exchange chamber 3, the second heat exchange tube 11 is provided with two circles, and the first heat exchange tube 8 of the circle, the second heat exchange tube 11 of the circle, the first heat exchange tube 8 of the circle and the second heat exchange tube 11 of the circle are sequentially provided from the circular circumference to the circle center in the same vertical cross section.
Further, in another embodiment of the present invention, the vertical cross section of the casing 1 is a rectangle, a plurality of rows of first heat exchange tubes 8 and a plurality of rows of second heat exchange tubes 11 are sequentially arranged from any one side to an opposite side of the rectangle in the same vertical cross section, each row of first heat exchange tubes 8 and each row of second heat exchange tubes 11 are arranged at intervals, and the first heat exchange tubes 8 and the second heat exchange tubes 11 in each row are uniformly arranged. The arrangement enables the heat exchange of the first heat exchange tube 8 and the second heat exchange tube 11 to be more uniform, and further improves the heat exchange efficiency.
The utility model discloses a catalytic combustion device for coking industry VOC exhaust-gas treatment's working process does: the gas to be treated (waste gas containing VOC) enters the pretreatment chamber 2 through the treated gas inlet, enters the filter 6 through the gas inlet side of the filter 6, the filter 6 filters catalyst poisons such as tar, dust and lead compounds in the waste gas, and then enters the first heat exchange tube 8 in the heat exchange chamber 3 through the gas outlet side of the filter 6, the gas to be treated in the first heat exchange tube 8 exchanges heat with the catalytic combustion gas generated in the shell side of the heat exchange chamber 3, the gas to be treated enters the buffer chamber 12 after being preliminarily preheated and the temperature is raised, meanwhile, the oxygen provided by the oxygen gas supply device 9 enters the second heat exchange tube 11 in the heat exchange chamber 3, the oxygen in the second heat exchange tube 11 exchanges heat with the catalytic combustion gas generated in the shell side of the heat exchange chamber 3, the gas enters the buffer chamber 12 after being preliminarily preheated, the gas to be treated and the oxygen are mixed in the buffer chamber 12 according to a set proportion and then enter the catalytic combustion chamber 4, the catalytic combustion is completed under the action of a catalyst in the catalytic combustion chamber 4 to generate nontoxic catalytic combustion gas (gases such as carbon dioxide, water and the like), the gas enters the shell side of the heat exchange chamber 3 from the gas outlet of the catalytic combustion chamber 4 through the gas distributor 18, exchanges heat with the gas to be treated and oxygen, fully utilizes waste heat, and is discharged from the catalytic combustion gas production outlet 10.
From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:
1. the utility model discloses a catalytic combustion device is used in coking industry VOC exhaust-gas treatment, the device includes casing 1, pretreater 2 has set gradually in casing 1, heat transfer chamber 3 and catalytic combustion room 4, treat that the treatment gas (the waste gas that contains VOC) is to tar in pretreater 2, catalyst poison prefiltering such as dust and lead compound, prevent catalyst poisoning, increase catalyst life-span, improve treatment efficiency, set up first heat exchange tube 8 and second heat exchange tube 11 in the heat transfer chamber 3, treat the catalytic combustion who treats that the treatment gas treatment forms after accomplishing and produce the gas and carry out the heat transfer with the treatment gas and oxygen in heat transfer chamber 3, effectively utilize the waste heat of catalytic combustion gas production, and make treatment gas and oxygen preheated by preliminary, reduce the energy consumption.
2. The gas generated by catalytic combustion in the heat exchange chamber 3 is subjected to tubular heat exchange with the gas to be treated and the oxygen, so that the heat exchange area is increased, the heat exchange efficiency is improved, the gas generated by catalytic combustion and the gas to be treated and the oxygen are further designed to be in a counter-flow mode, the heat exchange efficiency between gases is further improved, and the waste heat of the gas generated by catalytic combustion is fully utilized.
3. The gas to be treated and the oxygen firstly enter the buffer chamber 12 for preliminary mixing, so that the gas to be treated and the oxygen are uniformly mixed before entering the catalytic combustion chamber 4, and the gas to be treated and the oxygen are mixed according to a selected proportion, so that the catalytic combustion conversion rate is improved.
4. After a certain time of treatment, the back flushing pipeline 16 can be opened to back flush the filter 6, so that part of particles intercepted on the filter 6 are blown off, the filter 6 is prevented from being blocked in a short time, and the utilization rate is improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A catalytic combustion device for VOC waste gas treatment in the coking industry is characterized in that VOC-containing waste gas is gas to be treated,
the device comprises a shell, wherein one end of the shell is provided with a gas inlet to be treated, a pretreatment chamber, a heat exchange chamber and a catalytic combustion chamber are sequentially arranged in the shell from one end to the other end, an oxygen supply device is arranged outside the shell, wherein,
a filter is arranged in the pretreatment chamber, the air inlet side of the filter faces the gas inlet to be treated, the filter can intercept catalyst poisons in the gas to be treated,
a plurality of first heat exchange tubes are arranged in the heat exchange chamber and used for conveying the gas to be treated to the catalytic combustion chamber,
one ends of the first heat exchange tubes are communicated with the air outlet side of the filter, the other ends of the first heat exchange tubes are communicated with the air inlet of the catalytic combustion chamber,
the catalytic combustion chamber is filled with a catalyst, an air inlet of the catalytic combustion chamber is communicated with an outlet of the oxygen supply device, the gas to be treated conveyed by the first heat exchange tube and the oxygen provided by the oxygen supply device perform catalytic combustion reaction in the catalytic combustion chamber under the action of the catalyst, the gas to be treated is converted into catalytic combustion gas in the catalytic combustion chamber,
the gas outlet of the catalytic combustion chamber is communicated with the heat exchange chamber, the gas generated by catalytic combustion enters the heat exchange chamber from the gas outlet of the catalytic combustion chamber and exchanges heat with the gas to be treated in the first heat exchange tube, so that the gas to be treated enters the catalytic combustion chamber after being preheated,
the heat exchange chamber is provided with a catalytic combustion gas production outlet.
2. The catalytic combustion device for VOC exhaust gas treatment of the coking industry as claimed in claim 1,
a plurality of second heat exchange tubes are also arranged in the heat exchange chamber and used for conveying oxygen to the catalytic combustion chamber,
one ends of the second heat exchange tubes are communicated with the outlet of the oxygen supply device, the other ends of the second heat exchange tubes are communicated with the air inlet of the catalytic combustion chamber,
and the oxygen in the second heat exchange tube and the catalytic combustion gas are subjected to heat exchange in the heat exchange chamber.
3. The catalytic combustion device for VOC exhaust gas treatment of the coking industry as claimed in claim 2,
a buffer chamber is also arranged between the heat exchange chamber and the catalytic combustion chamber, the outlet of the buffer chamber is communicated with the air inlet of the catalytic combustion chamber,
the other end of the first heat exchange tube and the other end of the second heat exchange tube are both communicated with an inlet of the buffer chamber, and oxygen and the gas to be treated are mixed in the buffer chamber.
4. The catalytic combustion device for VOC exhaust gas treatment of the coking industry as claimed in claim 3,
a first side wall is arranged between the pretreatment chamber and the heat exchange chamber, a second side wall is arranged between the heat exchange chamber and the buffer chamber, a third side wall is arranged between the buffer chamber and the catalytic combustion chamber,
one end of the first heat exchange tube is connected with the first side wall, the other end of the first heat exchange tube is connected with the second side wall,
one end of the second heat exchange tube is connected with the first side wall, and the other end of the second heat exchange tube is connected with the second side wall.
5. The catalytic combustion device for VOC exhaust gas treatment of the coking industry as claimed in claim 1,
an ash collecting pool is arranged at the bottom of the pretreatment chamber, the ash collecting pool is positioned at the air inlet side of the filter, a back flushing pipeline is also arranged at the air outlet side of the filter,
and gas can be blown into the filter through the back blowing pipeline for back blowing, and the catalyst poison intercepted by the filter is blown down into the ash collecting tank.
6. The catalytic combustion device for VOC exhaust gas treatment of the coking industry as claimed in claim 1,
the device also comprises a gas distributor, the gas inlet of the gas distributor is communicated with the gas outlet of the catalytic combustion chamber, the gas outlet of the gas distributor is communicated with the heat exchange chamber,
the gas outlet of the gas distributor and the gas outlet of the catalytic combustion gas production are respectively positioned at two ends of the heat exchange chamber,
and the gas outlet of the gas distributor completely covers one end of the heat exchange chamber.
7. The catalytic combustion device for VOC exhaust gas treatment of the coking industry as claimed in claim 1,
the catalyst forms a honeycomb catalyst bed in the catalytic combustion chamber.
8. The catalytic combustion device for VOC exhaust gas treatment of the coking industry as claimed in claim 2,
the first heat exchange tube and the second heat exchange tube are arranged in parallel with the axis of the shell.
9. The catalytic combustion device for VOC exhaust gas treatment of the coking industry as claimed in claim 2,
the vertical cross section of the shell is circular, a plurality of circles of the first heat exchange tubes and a plurality of circles of the second heat exchange tubes are sequentially arranged from the circular circumference to the circle center in the same vertical cross section, each circle of the first heat exchange tubes and each circle of the second heat exchange tubes are arranged at intervals, and the first heat exchange tubes and the second heat exchange tubes in each circle are uniformly arranged.
10. The catalytic combustion device for VOC exhaust gas treatment of the coking industry as claimed in claim 2,
the vertical cross section of the shell is rectangular, multiple rows of the first heat exchange tubes and multiple rows of the second heat exchange tubes are sequentially arranged from any one side to opposite side of the rectangle in the same vertical cross section, each row of the first heat exchange tubes and each row of the second heat exchange tubes are arranged at intervals, and the first heat exchange tubes and the second heat exchange tubes in each row are uniformly arranged.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020505542.5U CN212227064U (en) | 2020-04-08 | 2020-04-08 | Catalytic combustion device for VOC (volatile organic compound) waste gas treatment in coking industry |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020505542.5U CN212227064U (en) | 2020-04-08 | 2020-04-08 | Catalytic combustion device for VOC (volatile organic compound) waste gas treatment in coking industry |
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| CN115854368A (en) * | 2023-02-16 | 2023-03-28 | 河北斐然环保工程有限公司 | Low concentration VOC exhaust purification processing apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115854368A (en) * | 2023-02-16 | 2023-03-28 | 河北斐然环保工程有限公司 | Low concentration VOC exhaust purification processing apparatus |
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