CN216778323U - Electric furnace flue gas carbon dioxide capture system - Google Patents
Electric furnace flue gas carbon dioxide capture system Download PDFInfo
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- CN216778323U CN216778323U CN202122900068.3U CN202122900068U CN216778323U CN 216778323 U CN216778323 U CN 216778323U CN 202122900068 U CN202122900068 U CN 202122900068U CN 216778323 U CN216778323 U CN 216778323U
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Abstract
The utility model relates to an electric furnace flue gas carbon dioxide capture system, which comprises a flue gas pretreatment device, a carbon dioxide capture device and a carbon dioxide recovery device which are sequentially connected, wherein the flue gas pretreatment device comprises a coarse dust removal device, a waste heat recovery device and a fine dust removal device which are sequentially connected, the coarse dust removal device is connected with an electric furnace through a flue, the carbon dioxide capture device comprises a first combustion reaction device, a second combustion reaction device, an air inlet pipeline and an air discharge pipeline, and the two combustion reaction devices are connected with the carbon dioxide recovery device through a second reversing valve. According to the utility model, large-particle dust and other small-particle impurities in the flue gas can be effectively removed, the impurities of the flue gas before entering the combustion reaction device are greatly reduced, the occurrence of side reactions in the combustion of the flue gas is reduced, the generation of byproducts of the flue gas is also reduced, the purity of carbon dioxide gas in the flue gas is ensured, and the service life of the oxygen carrier can be prolonged.
Description
Technical Field
The utility model relates to the field of ferrous metallurgy production, in particular to an electric furnace flue gas carbon dioxide capture system.
Background
Carbon dioxide is one of the most important gases causing greenhouse effect on one hand, and has higher civil and industrial values on the other hand, has wide application in various fields, and is a valuable resource. The method is not only widely applied to the aspects of petroleum exploitation, metallurgy, welding, low-temperature refrigerant, mechanical manufacturing, artificial rainfall, fire protection, chemical engineering, papermaking, agriculture, food industry, medical health and the like, but also can be applied to the top high-tech fields of supercritical solvents, laser technology, nuclear industry and the like.
The carbon dioxide emission of the world steel industry accounts for 5-6% of the total global emission, while the national steel industry accounts for about 15% of the total national emission, and the effective reduction of the carbon dioxide emission in the steel production is a problem to be solved urgently by the steel industry.
The main component of the furnace gas of the electric furnace is O2、CO、N2And CO2The furnace gas of the electric furnace is mainly formed by supplying oxygen for decarburization and entraining air from the electric furnace. The oxygen supply and decarburization are enhanced in the steelmaking process, and carbon elements in molten steel are oxidized into CO or CO2Gas is used. The components of the electric furnace smoke are related to the type of the smelted steel, the process operating conditions, the melting time, the smoke discharging mode and the like, and the variation range is large. In the flue gas dedusting and cooling system of the electric furnace, in order to meet the requirement of complete combustion of combustible components such as CO and the like, air is required to be introduced from a gap between a water-cooling bent pipe and a furnace cover, and the volume content of oxygen at the outlet of a combustion settling chamber is ensured to be more than 8%.
Because air is mixed in the electric furnace flue gas treatment process for supporting combustion, after combustionFinal CO in electric furnace flue gas2Is abundant in N2Diluting to make CO2The trapping becomes very difficult.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, the utility model provides an electric furnace flue gas carbon dioxide capture system, which comprises a flue gas pretreatment device, a carbon dioxide capture device and a carbon dioxide recovery device which are connected in sequence, wherein the carbon dioxide capture device comprises a first combustion reaction device, a second combustion reaction device, an air inlet pipeline and an air discharge pipeline, oxygen carriers are respectively arranged in the first combustion reaction device and the second combustion reaction device, an air outlet end of the flue gas pretreatment device and the air inlet pipeline are respectively connected with air inlet ends of the first combustion reaction device and the second combustion reaction device through first reversing valves, air outlet ends of the first combustion reaction device and the second combustion reaction device are respectively connected with the carbon dioxide recovery device and the air discharge pipeline through second reversing valves, and the flue gas pretreatment device comprises a coarse dust removal device, a carbon dioxide capture device and a carbon dioxide recovery device which are connected in sequence, The waste heat recovery device and the fine dust removal device, wherein the air inlet of the coarse dust removal device is connected with the electric furnace through a flue, and the air outlet of the fine dust removal device is connected with the first reversing valve.
Further, a sealing protection device is arranged between the air inlet of the coarse dust removal device and the electric furnace, and the sealing protection device is arranged at the mouth of the electric furnace.
Further, the flue is a water-cooling flue or a vaporization cooling flue.
Further, the carbon dioxide recovery device comprises a first heat exchanger, a compressor and a carbon dioxide storage tank which are sequentially connected, and an air inlet of the first heat exchanger is connected with the second reversing valve.
Further, the air discharge pipeline comprises a second heat exchanger, an induced draft fan and a chimney which are sequentially connected, and an air inlet of the second heat exchanger is connected with the second reversing valve.
Further, the coarse dust removal device is a gravity settling chamber or a cyclone dust collector.
Further, the waste heat recovery device is a waste heat boiler.
Further, the fine dust removal device is one of a bag-type dust remover, an electrostatic dust remover and a ceramic fiber dust remover.
Further, the oxygen carrier is at least one of Ni-based, Cu-based, Fu-based, Co-based and Mn-based oxygen carriers.
Further, the first combustion reaction device and the second combustion reaction device are respectively provided with a gas detector for detecting the concentration of carbon monoxide and oxygen, and the gas detectors control the first reversing valve and the second reversing valve in an interlocking manner.
The working principle of the electric furnace flue gas carbon dioxide capture system is that the flue gas in the electric furnace is pretreated before being captured by carbon dioxide, the pretreatment process sequentially comprises the steps of removing large-particle dust by a coarse dust removal device, then performing waste heat recovery by a waste heat recovery device, then entering a fine dust removal device for fine dust removal, and then entering the carbon dioxide capture device for carbon dioxide recovery and capture; the electric furnace flue gas in the carbon dioxide capture device enters a first combustion reaction device or a second combustion reaction device with an oxygen carrier in an oxidation state through a first reversing valve, oxidation-reduction reaction is carried out under the action of the oxygen carrier in the oxidation state, and CO in the flue gas is generated into CO2Simultaneously, the oxidized oxygen carrier is reduced into a reduced oxygen carrier, meanwhile, air enters a second combustion reaction device or a first combustion reaction device with the reduced oxygen carrier from an air inlet pipeline, the reduced oxygen carrier is oxidized and can be used as a standby combustion reaction device for combustion of the flue gas of the electric furnace, and simultaneously, the first reversing valve and the second reversing valve are switched, so that the flue gas can continuously react in the first combustion reaction device and the second combustion reaction device to generate CO2(ii) a CO in flue gas after combustion2The concentration is high, and the carbon dioxide enters a carbon dioxide recovery device through a second reversing valve to be recovered.
Due to the adoption of the technical scheme, compared with the prior art, the utility model has the following beneficial effects:
1) according to the carbon dioxide capture system, the sealing protection device is arranged at the fire hole of the electric furnace, so that a large amount of nitrogen in the air can be prevented from being mixed into the flue gas of the electric furnace, and the flue gas treatment capacity is greatly reduced;
2) according to the carbon dioxide capture system, the flue gas is pretreated before the capture of the carbon dioxide, large particle dust and other small particle impurities in the flue gas can be effectively removed in the coarse dust removal device and the fine dust removal device, the impurities in the flue gas before the flue gas enters the combustion reaction device are greatly reduced, the occurrence of side reactions in the combustion of the flue gas is reduced, the generation of by-products of the flue gas is also reduced, the purity of the carbon dioxide gas in the flue gas is ensured, and meanwhile, the service life of an oxygen carrier can be prolonged;
3) the carbon dioxide capture system of the utility model fully utilizes the waste heat and chemical energy of the flue gas while capturing and recovering the carbon dioxide in the flue gas, and simultaneously recovers and utilizes the waste heat of the heat generated by the reaction in the flue gas combustion device, thereby reducing the waste heat loss of the flue gas and improving the heat efficiency of the flue gas.
Drawings
FIG. 1 is a schematic structural diagram of a carbon dioxide capture system for flue gas of an electric furnace according to the present invention.
1-an electric furnace; 2-flue; 3-a coarse dust removal device; 4-a waste heat recovery device; 5-fine dust removal device; 6-a first reversing valve; 7-a first combustion reaction device; 8-a second combustion reaction device; 9-a second reversing valve; 10-a first heat exchanger; 11-a compressor; 12-a carbon dioxide storage tank; 13-a second heat exchanger; 14-a draught fan; 15-chimney.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention. In the drawings, the size and relative sizes of certain features may be exaggerated for clarity.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected" and "coupled" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; the term "connecting" may refer to a direct connection, an indirect connection through an intermediate, a connection between two elements or an interaction relationship between two elements, and a person skilled in the art can understand the specific meaning of the above terms in the present invention in a specific case.
In the description of the present invention, the terms "upper", "lower", "left", "right", "front", "rear", and the like are used in the orientations and positional relationships shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the designated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, in the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
As shown in the attached figure 1 of the specification, the utility model provides an electric furnace flue gas carbon dioxide capture system, which comprises a flue gas pretreatment device, a carbon dioxide capture device and a carbon dioxide recovery device which are sequentially connected, wherein the carbon dioxide capture device comprises a first combustion reaction device 7, a second combustion reaction device 8, an air inlet pipeline and an air discharge pipeline, oxygen carriers are respectively arranged in the first combustion reaction device 7 and the second combustion reaction device 8, specifically, the oxygen carriers are at least one of Ni-based, Cu-based, Fu-based, Co-based and Mn-based oxygen carriers, an air outlet end of the flue gas pretreatment device and the air inlet pipeline are respectively connected with air inlet ends of the first combustion reaction device 7 and the second combustion reaction device 8 through a first reversing valve 6, and air outlet ends of the first combustion reaction device 7 and the second combustion reaction device 8 are respectively connected with the carbon dioxide recovery device and the air discharge device through a second reversing valve 9 The pipe connection, flue gas preprocessing device is including the coarse dust collector 3, waste heat recovery device 4 and the smart dust collector 5 that connect gradually, the air inlet of coarse dust collector 3 passes through flue 2 and is connected with electric stove 1, the gas outlet of smart dust collector 5 with first switching-over valve 6 is connected, and is specific, waste heat recovery device 4 is exhaust-heat boiler, can retrieve the heat in the flue gas.
In one embodiment, a sealing protector is arranged between the air inlet of the rough dust removal device 3 and the electric furnace 1, and the sealing protector is arranged at the furnace mouth of the electric furnace 1, specifically, the sealing protector inhibits air from being sucked by blowing carbon dioxide gas around the furnace mouth of the electric furnace 1, so that the electric furnace flue gas without air is obtained, and the purity of the carbon dioxide collected subsequently is further improved.
As one embodiment, in order to avoid damage to the rough dust removal device 3 caused by excessively high temperature of the flue gas in the electric furnace 1, the flue 2 is a water-cooling flue or a vaporization cooling flue, and can primarily cool the flue gas output from the electric furnace 1; the coarse dust removal device 3 can remove large-particle impurities in the flue gas, the coarse dust removal device 3 is a gravity settling chamber or a cyclone dust collector, the flue gas after coarse dust removal enters the waste heat recovery device 4 for partial waste heat recovery, and the flue gas also has a certain temperature, so that the flue gas can also rapidly react when entering the subsequent first combustion reaction device 7 and the second combustion reaction device 8; flue gas after waste heat absorption gets into in the smart dust collector 5 and carries out further dust removal, smart dust collector 5 is one of sack cleaner, electrostatic precipitator, ceramic fiber dust remover, can further detach the impurity of the tiny granule in the flue gas, impurity that can greatly reduced flue gas entering combustion reaction device, the side reaction that can reduce in the combustion reaction device takes place, so by-product in the flue gas can be reduced and the by-product generates, the high purity of CO2 in the flue gas after further having guaranteed the burning, improve carbon dioxide entrapment recovery efficiency in the flue gas, also can prolong oxygen carrier's life simultaneously.
As one of the implementation modes, the carbon dioxide recovery device comprises a first heat exchanger 10, a compressor 11 and a carbon dioxide storage tank 12 which are connected in sequence, an air inlet of the first heat exchanger 10 is connected with the second reversing valve 9, the burned flue gas has a certain temperature, the waste heat of the flue gas can be fully recovered through the first heat exchanger, the energy consumption is reduced, the concentration of carbon dioxide in the flue gas from the second reversing valve is high, the flue gas is conveyed to the carbon dioxide storage tank for storage under the action of the compressor, the carbon dioxide storage tank 12 can be connected with a sealing protection device, the carbon dioxide injected to the mouth of the electric furnace is provided by the carbon dioxide storage tank 12, the carbon dioxide can be recycled, and the cost is greatly saved; in order to facilitate monitoring of the storage condition of the carbon dioxide storage tank 12, a pressure detector, a temperature detector and other real-time detection devices are further arranged on the carbon dioxide storage tank 12.
As one embodiment, the air discharge pipeline comprises a second heat exchanger 13, an induced draft fan 14 and a chimney 15 which are connected in sequence, and an air inlet of the second heat exchanger 13 is connected with the second reversing valve 9; air enters the combustion reaction device after combustion from the first reversing valve 6, the temperature in the combustion reaction device is higher than that of the air, after full contact, when the air passes through the second heat exchanger 13, heat can be recycled by the second heat exchanger 13, and heat energy of smoke can be fully recycled; the air discharge pipeline is also provided with an air detection device which is discharged from a chimney within a safe discharge range.
In a further detailed embodiment, the oxygen carrier has two forms, the oxygen carrier initially added into the combustion reaction device is in an oxidation state, after the flue gas enters the combustion reaction device, the flue gas reacts with the oxidation state oxygen carrier, CO generates CO2, and meanwhile, the oxidation state oxygen carrier is reduced into a reduction state oxygen carrier; after air is introduced, the air reacts with the reduced oxygen carrier, the reduced oxygen carrier is oxidized into an oxidized oxygen carrier, and the flue gas can be continuously combusted; as shown in the attached figure 1 of the specification, after passing through a flue gas pretreatment device, flue gas enters a first combustion reaction device through a first reversing valve and then reacts with an oxidation-state oxygen carrier to generate carbon dioxide, the oxidation-state oxygen carrier is reduced, meanwhile, air enters a second combustion reaction device through an air inlet pipeline and reacts with a reduction-state oxygen carrier, the reduction-state oxygen carrier is oxidized and can continue to combust the flue gas, the flue gas of the first combustion reaction device is recovered through a carbon dioxide recovery device after coming out, and the air of the second combustion reaction device is discharged through an air discharge pipeline; in order to facilitate regulation and control, gas detectors for detecting concentrations of carbon monoxide and oxygen are arranged on the first combustion reaction device 7 and the second combustion reaction device 8, the gas detectors control the first reversing valve 6 and the second reversing valve 9 in an interlocking manner, when the concentration of carbon monoxide in the first combustion reaction device 7 and the concentration of oxygen in the second combustion reaction device 8 reach set values respectively, the first reversing valve 6 and the second reversing valve 9 are switched simultaneously, so that flue gas discharged by the flue gas pretreatment device enters the second combustion reaction device 8, and air enters the first combustion reaction device 7, so that the carbon dioxide capture device can continuously capture and recover carbon dioxide; wherein the set value of the carbon monoxide concentration is not higher than the concentration of the carbon monoxide in the flue gas discharged by the flue gas pretreatment device, and the set value of the oxygen concentration is not lower than the oxygen concentration in the air.
In conclusion, before the flue gas in the electric furnace is subjected to carbon dioxide capture, pretreatment is carried out, large-particle dust is removed by a coarse dust removal device in the pretreatment process, then waste heat is recovered by a waste heat recovery device, fine dust removal is carried out by a fine dust removal device, and then carbon dioxide is recovered and captured by the carbon dioxide capture device; the pretreated flue gas is collected and recovered by carbon dioxide, and the flue gas can be collected and recovered continuously, so that the time for replacing the oxygen carrier is saved, and the collection and recovery efficiency of the carbon dioxide is improved.
And those not described in detail in this specification are well within the skill of those in the art.
It should be understood by those skilled in the art that the present invention may be embodied in many other specific forms without departing from the spirit or scope of the utility model. Although an embodiment of the present invention has been described, it is understood that the present invention should not be limited to this embodiment, but variations and modifications can be made by one skilled in the art within the spirit and scope of the utility model as defined in the appended claims.
Claims (10)
1. The electric furnace flue gas carbon dioxide capture system comprises a flue gas pretreatment device, a carbon dioxide capture device and a carbon dioxide recovery device which are sequentially connected, wherein the carbon dioxide capture device comprises a first combustion reaction device, a second combustion reaction device, an air inlet pipeline and an air discharge pipeline, oxygen carriers are respectively arranged in the first combustion reaction device and the second combustion reaction device, the air outlet end and the air inlet pipeline of the flue gas pretreatment device are respectively connected with the air inlet ends of the first combustion reaction device and the second combustion reaction device through first reversing valves, and the air outlet ends of the first combustion reaction device and the second combustion reaction device are respectively connected with the carbon dioxide recovery device and the air discharge pipeline through second reversing valves The waste heat recovery device and the fine dust removal device, wherein the air inlet of the coarse dust removal device is connected with the electric furnace through a flue, and the air outlet of the fine dust removal device is connected with the first reversing valve.
2. The electric furnace flue gas carbon dioxide capture system of claim 1, wherein a sealing protection device is arranged between the air inlet of the coarse dust removal device and the electric furnace, and the sealing protection device is arranged at the mouth of the electric furnace.
3. The electric furnace flue gas carbon dioxide capture system of claim 1, wherein the flue is a water-cooled flue or a vaporization cooling flue.
4. The electric furnace flue gas carbon dioxide capture system according to claim 1, wherein the carbon dioxide recovery device comprises a first heat exchanger, a compressor and a carbon dioxide storage tank which are connected in sequence, and the air inlet of the first heat exchanger is connected with the second reversing valve.
5. The electric furnace flue gas carbon dioxide capture system of claim 1, wherein the air discharge pipeline comprises a second heat exchanger, an induced draft fan and a chimney which are connected in sequence, and an air inlet of the second heat exchanger is connected with the second reversing valve.
6. The electric furnace flue gas carbon dioxide capture system of claim 1, wherein the coarse dust removal device is a gravity settling chamber or a cyclone dust collector.
7. The electric furnace flue gas carbon dioxide capture system of claim 1, wherein the waste heat recovery device is a waste heat boiler.
8. The electric furnace flue gas carbon dioxide capture system of claim 1, wherein the fine dust removal device is one of a bag-type dust remover, an electrostatic dust remover, and a ceramic fiber dust remover.
9. The electric furnace flue gas carbon dioxide capture system of claim 1, wherein the oxygen carrier is one of a Ni-based, Cu-based, Fu-based, Co-based, Mn-based oxygen carrier.
10. The electric furnace flue gas carbon dioxide capture system according to claim 1, wherein a gas detector for detecting the concentration of carbon monoxide and oxygen is arranged on each of the first combustion reaction device and the second combustion reaction device, and the gas detectors interlockingly control the first reversing valve and the second reversing valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122900068.3U CN216778323U (en) | 2021-11-24 | 2021-11-24 | Electric furnace flue gas carbon dioxide capture system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122900068.3U CN216778323U (en) | 2021-11-24 | 2021-11-24 | Electric furnace flue gas carbon dioxide capture system |
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| CN216778323U true CN216778323U (en) | 2022-06-21 |
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| CN202122900068.3U Active CN216778323U (en) | 2021-11-24 | 2021-11-24 | Electric furnace flue gas carbon dioxide capture system |
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