CN212457982U - Device for removing tar and VOCs (volatile organic compounds) in flue gas of anode roasting furnace - Google Patents
Device for removing tar and VOCs (volatile organic compounds) in flue gas of anode roasting furnace Download PDFInfo
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- CN212457982U CN212457982U CN202021272122.3U CN202021272122U CN212457982U CN 212457982 U CN212457982 U CN 212457982U CN 202021272122 U CN202021272122 U CN 202021272122U CN 212457982 U CN212457982 U CN 212457982U
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Abstract
The utility model discloses tar and VOC in flue gas of an anode roasting furnaceSThe removal device comprises a pretreatment system; the heat storage oxidation chamber is connected with the pretreatment system through a pipeline; a plurality of thermocouples and transmitters thereof are arranged in the heat storage oxidation chamber; each thermocouple and the transmitter thereof are electrically connected with a heat accumulator which is used for being connected with the desulfurization and dust removal system. The removing device is additionally provided with a pretreatment system which is mainly used for absorbing the liquid phase part of tar components while dispersing tar in the roasting smoke and adopting hot air to remove the smokeThe tar in the fuel is ignited. By adopting the device, the tar and the VOCs generated by the flue gas in the roasting process can be effectively treated together, thereby fundamentally solving the problems of tar and VOC in the roasting flue gasSDifficult to be synergistically treated. And the removal rate of tar and VOCs can reach more than 98 percent, and the method has the characteristics of high thermal efficiency, low operation cost, suitability for treating large-air-volume low-concentration waste gas and the like.
Description
Technical Field
The utility model relates to a waste gas treatment device technical field especially relates to a tar, VOC in positive pole roasting furnace flue gasSThe removal device of (1).
Background
In the production process of the anode for aluminum, roasting is an important process, and the main purpose is that the formed green product is sintered at high temperature in a roasting furnace to coke coal tar pitch in the green product, so that the use of an electrolytic cell is met. Tar and VOC can be generated in the flue gas in the anode roasting processSAnd the treatment is not good, and the local ecological environment is seriously influenced. The traditional roasting flue gas treatment mostly adopts an electric catching dry purification technology, but the purification effect of the spray cooler and the electric catching dry purification technology on the roasting flue gas is not ideal. Particularly, after entering thirteen five, the tar and VOC of the industrial kiln are clear in the air pollution prevention and control plan of each province and citySTo comprehensively start VOCSPollution control work on tar and VOC of industrial kilnSThe comprehensive treatment puts forward special requirements, and the tar and VOC in the anode roasting smoke are treatedSIs in need of much attention.
Chinese utility model patent publication No. CN106310871A discloses a method for combined degradation of waste gas from coal chemical industry, which comprises dedusting and desulfurizing coking waste gas to remove fly ash, tar, part of high boiling point VOCs and oxysulfide; adsorbing at high pressure and desorbing at low pressure by pressure swing adsorption to obtain concentrated NOxAn exhaust gas; oxidized NO is obtained by oxidation treatmentxAn exhaust gas; removing H in the raw gas by the coal-made coke waste gas through a dehydrogenation membrane2Dehydrogenation exhaust gas and oxidized NOxFully mixing and preheating waste gas, heating to ignition temperature, and catalytically burning carbon smoke and polycyclic aromatic hydrocarbon in coal-to-coke waste gas to obtain NOxAs an oxidizing agentSoot and polycyclic aromatic hydrocarbons are reduced and the waste gas is converted into N in one step2、CO2And H2And O. The utility model utilizes NOxThe strong oxidizing property of the catalyst solves the problem that carbon smoke particles and polycyclic aromatic hydrocarbon in the coal-to-coke waste gas are difficult to degrade, and simultaneously NO is addedxRealize synchronous degradation and is reduced into N2And H2And O, the process saves energy and has high waste gas treatment efficiency. However, the method disclosed in this utility model is only suitable for the field of coal chemical industry, but not for the flue gas generated during the production of aluminum anodes.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a to the characteristics of high tar content, caking property are strong in the calcination flue gas to contain multiple organic compounds such as benzopyrene, combine anode roasting technology and temperature, the invention is to flue gas tar and VOC of anode roasting furnaceSThe removal device of (1). The device has increased pretreatment systems, and pretreatment systems mainly adsorbs tar composition liquid phase part when dispersing the tar in the calcination flue gas to adopt hot-blast to ignite the tar in the flue gas. By adopting the device, the tar and the VOCs generated by the flue gas in the roasting process can be effectively treated together, thereby fundamentally solving the problems of tar and VOC in the roasting flue gasSDifficult to be synergistically treated. The removal rate of tar and VOCs can reach more than 98 percent, and the method has the characteristics of high thermal efficiency, low operation cost, suitability for treating large-air-volume low-concentration waste gas and the like; when the concentration is slightly high, secondary waste heat recovery can be carried out, the heat recovery efficiency reaches more than 95 percent, the comprehensive emission standard of atmospheric pollutants in GB 16297 + 1996 is met, the production and operation cost is effectively reduced, the ecological environment is improved, and the competitiveness of enterprises is improved.
In order to achieve the above object, the present invention provides the following technical solutions:
tar and VOC (volatile organic compound) in flue gas of anode roasting furnaceSThe removal device of (2), which comprises:
the pretreatment system is connected with the flue gas generated in the roasting process through a flue pipe, and is used for adsorbing the liquid phase part of tar components while dispersing the tar in the roasting flue gas, and igniting the tar in the flue gas by adopting hot air;
the heat storage oxidation chamber is connected with the pretreatment system through a pipeline; a plurality of thermocouples and transmitters thereof are arranged in the heat storage oxidation chamber;
the heat accumulators are used for being connected with the desulfurization and dust removal system, and each heat accumulator is electrically connected with one thermocouple and the transmitter thereof.
Further, the pretreatment system comprises:
a desorption fan;
the first air duct burner is connected with the desorption fan;
the three adsorption combustion chambers and the desorption combustion chamber are connected with the first air channel combustor through pipelines; the four combustion chambers are connected with the flue gas generated in the roasting process through smoke pipes, and the four combustion chambers are connected with the heat accumulation oxidation chamber through pipelines.
Furthermore, pneumatic switching valves are arranged on pipelines which are connected with the first air duct combustor in each of the three adsorption combustion chambers and the desorption combustion chamber.
Furthermore, the three adsorption combustion chambers and the desorption combustion chamber are connected with a back-blowing fan through pipelines.
Furthermore, a plurality of thermal resistors and transmitters thereof are arranged on a pipeline connecting the heat storage oxidation chamber and the pretreatment system.
Furthermore, the regenerative oxidation chamber is connected with a second air channel combustor.
Furthermore, the heat accumulation oxidation chamber is connected with a combustion fan.
Furthermore, each heat accumulator is connected with a back-blowing fan through a pipeline.
Further, the smoke tube is an annular smoke tube.
The utility model provides a tar, VOC in positive pole bakes burning furnace flue gas over a slow fireSThe removing device has the following beneficial effects:
1. economic benefits are as follows: adopt the utility model discloses can satisfy the national environmental protection and discharge the requirement, reach ultralow emission, especially do not stop production, unlimited production during the winter heating, improve enterprise competitiveness.
2. Environmental benefits: use the utility model discloses afterwards, tar and VOCs obtain effective treatment in the waste gas that calcination production process produced, and tar, VOCs clearance > 98%, and heat recovery efficiency reaches more than 95%, satisfies GB 16297-.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to these drawings.
FIG. 1 shows tar and VOC in the flue gas of the anode roasting furnace provided by the embodiment of the present inventionSThe structure schematic diagram of the removing device;
FIG. 2 shows tar and VOC in the flue gas of the anode roasting furnace provided by the embodiment of the present inventionSSchematic diagram of the using state of the removing device.
Description of reference numerals:
1. tar and VOC in flue gas of anode roasting furnaceSThe removal device of (2); 101. a pre-treatment system; 1011. a desorption fan; 1012. a first duct burner; 1013. an adsorption combustion chamber; 1014. a desorption combustion chamber; 1015. A pneumatic switching valve; 102. a thermal storage oxidation chamber; 103. a thermocouple and a transmitter thereof; 104. a heat accumulator; 105. thermal resistors and their transducers; 106. a second duct burner; 107. a back-blowing fan; 108. a combustion fan; 2. a smoke pipe; 3. roasting furnace; 4. a desulfurization dust removal system; 5. an induced draft fan; 6. and (4) a chimney.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings.
Referring to FIG. 1, an anode bakingTar and VOC in burning furnace smokeSThe removal device of (2), which comprises:
the pretreatment system 101 is connected with the flue gas generated in the roasting process through a flue pipe 2, and is used for dispersing tar in the roasting flue gas, adsorbing a liquid phase part of tar components, and igniting the tar in the flue gas by adopting hot air;
a regenerative oxidizer 102 connected to the pretreatment system 101 through a pipeline; a plurality of thermocouples and a transmitter 103 thereof are arranged in the heat accumulation oxidation chamber 102;
and the heat accumulators 104 are used for being connected with the desulfurization and dust removal system, wherein each heat accumulator 104 is electrically connected with one thermocouple and the transmitter 103 thereof.
The pretreatment system 101 includes:
a desorption fan 1011;
a first air duct burner 1012 connected to the desorption fan 1011;
three adsorption combustion chambers 1013 and one desorption combustion chamber 1014, which are connected to the first duct burner 1012 through pipes; the four combustion chambers are connected with the flue gas generated in the roasting process through the flue pipe 2, and the four combustion chambers are connected with the regenerative oxidation chamber 102 through pipelines.
The three adsorption combustion chambers 1013 and the desorption combustion chamber 1014 are connected with the blowback fan 107 through pipelines.
A plurality of thermal resistors and a transmitter 105 thereof are arranged on a pipeline connecting the thermal storage oxidation chamber 102 and the pretreatment system 101. The regenerative oxidizer 102 is connected to a second duct burner 106 and a combustion fan 108.
Each heat accumulator 104 is connected with a back-blowing fan 107 through a pipeline.
Specifically, as shown in FIG. 1, the tar and VOC in the flue gas of an anode roasting furnaceSComprises a pretreatment system 101, a regenerative oxidation chamber 102, a thermocouple and a transmitter 103 thereofThe heat accumulator 104, the resistor and the transmitter 105 thereof, the second air duct burner 106, the back blower 107 and the combustion fan 108.
As shown in fig. 2, the pretreatment system 101 is connected to the flue gas generated in the roasting process through a flue pipe 2, and the pretreatment system 101 is used for dispersing tar in the roasting flue gas, adsorbing the liquid phase of tar components, and igniting the tar in the flue gas by using hot air.
In this embodiment, as shown in fig. 1, the pretreatment system 101 includes a desorption fan 1011, a first duct burner 1012, three adsorption combustion chambers 1013, and a desorption combustion chamber 1014. Wherein, the first air duct burner 1012 is connected with the desorption fan 1011.
Three adsorption combustion chambers 1013 and one desorption combustion chamber 1014, all of which are connected to the first duct burner 1012 by pipes. The four combustion chambers are connected with the flue gas generated in the roasting process through the flue pipe 2, and the three adsorption combustion chambers 1013 and the desorption combustion chamber 1014 are connected with the regenerative oxidation chamber 102 through pipelines. The regenerative oxidation chamber 102 is internally provided with a plurality of thermocouples and a transmitter 103 thereof.
In addition, the three adsorption combustion chambers 1013 and the desorption combustion chamber 1014 are connected to the blowback fan 107 through pipes. The back-blowing fan 107 can be used for back-blowing and cleaning the three adsorption combustion chambers 1013 and the desorption combustion chamber 1014, which is helpful for keeping the cleanliness of each combustion chamber.
The thermal mass 104 is preferably a ceramic thermal mass, and the number of the thermal mass is several, and the thermal mass is used for connecting with a desulfurization dust removal system. The ceramic heat accumulator has the characteristics of low thermal expansion, large specific heat capacity, large surface area, small pressure drop, small thermal resistance, good heat conduction performance, good thermal shock resistance and the like, and therefore, the ceramic heat accumulator is preferably used in the present embodiment.
Each ceramic thermal mass 104 is electrically connected to a thermocouple and its transducer 103. These ceramic thermal accumulators 104 are disposed outside the regenerative oxidizer 102. Each ceramic heat accumulator 104 is connected with a back-blowing fan 107 through a pipeline. The back-blowing fan 107 can be used for back-blowing cleaning the ceramic heat accumulator 104 and the regenerative oxidation chamber 102, which is helpful for maintaining the cleanliness of each ceramic heat accumulator 104 and regenerative oxidation chamber 102.
The pipelines of the three adsorption combustion chambers 1013 and the desorption combustion chamber 1014 connected with the heat accumulation oxidation chamber 102 are provided with a plurality of thermal resistors and transmitters 105 thereof. Furthermore, the regenerative thermal oxidizer 102 is connected to a second duct burner 106 and a combustion fan 108, respectively.
The tar and VOC in the anode roasting furnace flue gasSThe thermocouple and the transmitter 103, the desorption fan 1011, the first air duct burner 1012, the thermal resistor and the transmitter 105, the second air duct burner 106, the back blower 107, the combustion fan 108 and other electrical components in the desorption device can be electrically connected with the electric control device. For example, the thermocouple and its transmitter 103, the desorption fan 1011, the first air duct burner 1012, the thermal resistor and its transmitter 105, the second air duct burner 106, the blowback fan 107, the combustion fan 108, and other electrical components may be electrically connected to the control cabinet (the control cabinet is internally provided with a PLC, an upper computer, a display screen, and the like), and the control cabinet controls the electrical components.
The tar and VOC in the anode roasting furnace flue gasSThe removing device has the following beneficial effects:
1. economic benefits are as follows: the removal device can meet the national environmental protection emission requirement, achieves ultralow emission, does not stop production and limit production particularly during heating in winter, and improves the enterprise competitiveness.
2. Environmental benefits: after the removal device is applied, tar and VOCs in waste gas generated in the roasting production process are effectively treated, the removal rate of the tar and the VOCs is more than 98%, the heat recovery efficiency reaches more than 95%, the comprehensive emission standard of atmospheric pollutants in GB 16297 + 1996 is met, and the flue gas reaches ultralow emission, meets the environmental emission standard, improves the ecological environment and improves the enterprise competitiveness.
As shown in fig. 2, an anodeTar and VOC in roasting furnace flue gasSThe removing device 1 is connected between the roasting furnace 3 and the desulfurization and dust removal system 4. The pretreatment system 101 is connected to the flue gases produced during roasting in the roasting furnace 3 via a flue tube 2, which flue tube 2 is preferably an annular flue tube. Three adsorption combustors 1013 and one desorption combustor 1014 in the pretreatment system 101 are connected to the ring-shaped flue pipe. Tar and VOC in flue gas of anode roasting furnaceSEach ceramic heat accumulator 104 in the removing device 1 is connected with the desulfurization and dust removal system 4.
The flue gas generated in the roasting process of the roasting furnace 3 enters tar and VOCSThe pretreatment system 101 of the treatment device is provided with three adsorption combustion chambers 1013 and a desorption combustion chamber 1014 in the pretreatment system 101, wherein the desorption adopts 450 ℃ hot air to ignite tar, and combustible waste gas is oxidized into carbon dioxide and water so as to purify the waste gas, and the specific mode is as follows:
(1) flue gas generated in the roasting process enters three adsorption combustion chambers 1013 and one desorption combustion chamber 1014 in a pretreatment system 101 of a removal device 1 through an annular smoke pipe 2, a pneumatic switching valve 1015 is switched to guide the gas to enter the pretreatment system 101, the pretreatment system 101 plays a role in dispersing the roasted flue gas and adsorbs a liquid phase part of tar components in the waste gas, and the desorption adopts hot air at 450 ℃ to ignite the tar in the flue gas.
(2) The burnt tar flue gas enters a heat storage oxidation chamber 102 of the removing device 1 for oxidation, the heat storage oxidation chamber 102 is an important area for oxidation of the roasting flue gas and is also a place with the highest temperature in the removing device 1, the heat storage oxidation chamber 102 is operated at a slight negative pressure, the treatment air quantity is stable, organic matters in the flue gas are oxidized and decomposed when the roasting flue gas passes through the heat storage oxidation chamber 102, and high flue gas decomposition efficiency is achieved.
(3) After the flue gas is oxidized and decomposed in the heat storage oxidation chamber 102, the heat of the high-temperature flue gas is stored through the ceramic heat accumulator 104, and when the low-temperature untreated waste gas enters, the heat of the ceramic heat accumulator 104 is released to heat the waste gas, so that the heat is stored and released.
(4) The flue gas treated by the waste gas in the regenerative oxidation chamber 102 enters a desulfurization and dust removal system 4 for desulfurization and dust removal, and the finally purified flue gas is introduced into a chimney 6 by an induced draft fan 5 and discharged from the chimney 6.
The embodiment is designed aiming at the tar and VOC (volatile organic compounds) in the flue gas of the anode roasting furnace according to the characteristics of high tar content and strong caking property in the roasting flue gas and containing a plurality of organic compounds such as benzopyrene and the like by combining the anode roasting process and temperatureSThe removal device of (1). The device has increased pretreatment systems, and pretreatment systems mainly adsorbs tar composition liquid phase part when dispersing the tar in the calcination flue gas to adopt hot-blast to ignite the tar in the flue gas. By adopting the device, the tar and the VOCs generated by the flue gas in the roasting process can be effectively treated together, thereby fundamentally solving the problems of tar and VOC in the roasting flue gasSDifficult to be synergistically treated. The removal rate of tar and VOCs can reach more than 98 percent, and the method has the characteristics of high thermal efficiency, low operation cost, suitability for treating large-air-volume low-concentration waste gas and the like; when the concentration is slightly high, secondary waste heat recovery can be carried out, the heat recovery efficiency reaches more than 95 percent, the comprehensive emission standard of atmospheric pollutants in GB 16297 + 1996 is met, the production and operation cost is effectively reduced, the ecological environment is improved, and the competitiveness of enterprises is improved.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.
Claims (9)
1. The utility model provides a desorption device of tar, VOCs in anode roasting furnace flue gas which characterized in that includes:
the pretreatment system is connected with the flue gas generated in the roasting process through a flue pipe, and is used for adsorbing the liquid phase part of tar components while dispersing the tar in the roasting flue gas, and igniting the tar in the flue gas by adopting hot air;
the heat storage oxidation chamber is connected with the pretreatment system through a pipeline; a plurality of thermocouples and transmitters thereof are arranged in the heat storage oxidation chamber;
the heat accumulators are used for being connected with the desulfurization and dust removal system, and each heat accumulator is electrically connected with one thermocouple and the transmitter thereof.
2. The removal device of claim 1, wherein the pretreatment system comprises:
a desorption fan;
the first air duct burner is connected with the desorption fan;
the three adsorption combustion chambers and the desorption combustion chamber are connected with the first air channel combustor through pipelines; the four combustion chambers are connected with the flue gas generated in the roasting process through smoke pipes, and the four combustion chambers are connected with the heat accumulation oxidation chamber through pipelines.
3. The desorption apparatus as claimed in claim 2, wherein pneumatic switching valves are provided on the pipes connecting each of the three adsorption combustion chambers and the desorption combustion chamber with the first duct burner.
4. The desorption apparatus of claim 2 wherein three adsorption combustion chambers and one desorption combustion chamber are connected to the blowback fan through pipes.
5. The removal device of claim 1, wherein the thermal resistors and the transmitters thereof are arranged on pipelines connecting the thermal storage oxidation chamber and the pretreatment system.
6. The removal apparatus as claimed in claim 1, wherein the regenerative oxidizer is connected to a second duct burner.
7. The removal device of claim 6, wherein the regenerative oxidizer is connected to a combustion fan.
8. The removal device of claim 1, wherein each of the heat storage bodies is connected to a blowback fan via a pipe.
9. The removal device of claim 1, wherein the flue tube is an annular flue tube.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021272122.3U CN212457982U (en) | 2020-07-01 | 2020-07-01 | Device for removing tar and VOCs (volatile organic compounds) in flue gas of anode roasting furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021272122.3U CN212457982U (en) | 2020-07-01 | 2020-07-01 | Device for removing tar and VOCs (volatile organic compounds) in flue gas of anode roasting furnace |
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| CN212457982U true CN212457982U (en) | 2021-02-02 |
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| CN202021272122.3U Active CN212457982U (en) | 2020-07-01 | 2020-07-01 | Device for removing tar and VOCs (volatile organic compounds) in flue gas of anode roasting furnace |
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