CN110982966B - Multi-stage recovery system and method for blast furnace slag and coal gas waste heat - Google Patents
Multi-stage recovery system and method for blast furnace slag and coal gas waste heat Download PDFInfo
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- CN110982966B CN110982966B CN201911144298.2A CN201911144298A CN110982966B CN 110982966 B CN110982966 B CN 110982966B CN 201911144298 A CN201911144298 A CN 201911144298A CN 110982966 B CN110982966 B CN 110982966B
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- 239000002893 slag Substances 0.000 title claims abstract description 135
- 239000002918 waste heat Substances 0.000 title claims abstract description 131
- 238000011084 recovery Methods 0.000 title claims abstract description 119
- 239000003034 coal gas Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000007789 gas Substances 0.000 claims abstract description 123
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 100
- 238000006243 chemical reaction Methods 0.000 claims abstract description 59
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 50
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 25
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 25
- 238000006057 reforming reaction Methods 0.000 claims abstract description 17
- 239000002245 particle Substances 0.000 claims abstract description 16
- 239000003345 natural gas Substances 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims description 10
- 239000000446 fuel Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 230000007175 bidirectional communication Effects 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000005338 heat storage Methods 0.000 claims description 3
- 230000001737 promoting effect Effects 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract description 7
- 230000003197 catalytic effect Effects 0.000 abstract description 4
- 238000000926 separation method Methods 0.000 abstract description 3
- 125000004122 cyclic group Chemical group 0.000 abstract 1
- 239000002440 industrial waste Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 238000005265 energy consumption Methods 0.000 description 7
- 238000004146 energy storage Methods 0.000 description 4
- 239000008187 granular material Substances 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000002407 reforming Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
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- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- 230000000171 quenching effect Effects 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2200/00—Recycling of non-gaseous waste material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/122—Reduction of greenhouse gas [GHG] emissions by capturing or storing CO2
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention relates to the field of industrial waste heat recovery, in particular to a multi-stage recovery system and a method for blast furnace slag and coal gas waste heat, wherein the multi-stage recovery system comprises a blast furnace, a chemical reaction slag waste heat recovery device, an explicit heat exchange slag waste heat recovery device, a blower, a gas heat exchanger, a gas separator and a natural gas storage tank; and the waste heat of the blast furnace slag and the coal gas is recovered in a multi-stage manner by adopting a chemical and physical recovery method. The high-temperature furnace slag is used as a heat carrier and a catalytic cocatalyst in the chemical reaction furnace slag waste heat recovery device; the chemical utilization of the waste heat of the high-temperature section and the cyclic utilization of the carbon dioxide material are realized through the methane reforming reaction; the waste heat recovery of the blast furnace gas is realized through gas heat exchange and gas separation, and the emission of carbon dioxide is reduced; the high temperature particles after the chemical reaction can be subjected to sensible heat recovery by air heat exchange. The invention can obviously improve the utilization rate of the waste heat of the blast furnace slag and the coal gas, realizes the high-efficiency utilization of the waste heat in the blast furnace process, saves energy and reduces emission, and has great popularization prospect.
Description
Technical Field
The invention relates to the field of industrial solid waste heat recovery, in particular to a multi-stage recovery system and a multi-stage recovery method for blast furnace slag and coal gas waste heat.
Background
The steel industry is always the most important of the national industry, wherein the energy consumption of blast furnace steelmaking can reach 40 percent of the total energy consumption of the steel industry, 10 to 15 percent of the total energy consumption of the country, and the blast furnace steelmaking belongs to the high energy consumption industry. And the blast furnace iron making has very high temperature, the temperature of the discharged molten slag can even reach (1450-1650 ℃), the heat content can reach 1770MJ/t, the heat content of each ton of molten slag is equivalent to the heat generated by 60kg of standard coal, meanwhile, the energy carried by the blast furnace gas is not ignored, and the energy has very wide application prospect.
However, the problem of the waste heat utilization of the blast furnace slag is still serious. The industrial water quenching method is used for processing a large amount of waste heat, so that the waste heat is wasted greatly and the environment is damaged, the other defects of low comprehensive utilization rate of the waste heat and the like exist for sensible heat recovery after slag granulation, and the blast furnace gas also has the defects of low calorific value, difficulty in utilization and the like. Therefore, how to design a waste heat recovery system of the blast furnace is important, the waste heat utilization rate is improved, the environmental pollution is reduced, and the energy conservation and emission reduction are realized.
Disclosure of Invention
The invention provides a multi-stage recovery system and a multi-stage recovery method for blast furnace slag and coal gas waste heat, aiming at overcoming the problem of low waste heat utilization rate of blast furnace slag in the prior art.
In the technical scheme, the multi-stage recovery system for the waste heat of the blast furnace slag and the coal gas mainly comprises the blast furnace, a chemical reaction slag waste heat recovery device and an explicit heat exchange slag waste heat recovery device. The blast furnace is provided with a gas input end and a slag output end, and the chemical reaction slag waste heat recovery device and the explicit heat exchange slag waste heat recovery device are provided with a gas input end and a slag output end; the input and output ends of the chemical reaction slag waste heat recovery device are correspondingly connected with the input and output ends of the blast furnace to form bidirectional communication; the input end of the explicit heat exchange slag waste heat recovery device is connected with the output end of the chemical reaction slag waste heat recovery device, and the gas output end of the explicit heat exchange slag waste heat recovery device is connected with the input end of the blast furnace.
Preferably, the chemical reaction slag waste heat recovery device is a countercurrent direct contact heat exchange device; the explicit heat exchange slag waste heat recovery device is a gas-solid countercurrent heat exchange device.
Preferably, the multistage recovery system further comprises a gas heat exchanger, a gas separator and a natural gas storage tank; the input end of the gas separator is respectively connected with the blast furnace and the natural gas storage tank, and the output end of the gas separator is respectively connected with the gas heat exchanger and the chemical reaction slag waste heat recovery device; and the input end and the output end of the gas separator are respectively connected with the gas heat exchanger and the chemical reaction slag waste heat recovery device.
Preferably, the explicit heat exchange slag waste heat recovery device is connected with an air blower for blowing air.
Preferably, the temperature of the output end of the blast furnace is greater than or equal to 1000 ℃.
The invention also provides a method applied to the multi-stage recovery system of the blast furnace slag and coal gas waste heat, which comprises the following specific steps:
(1) the blast furnace gas discharged from the blast furnace and the methane gas introduced from the natural gas tank perform countercurrent heat exchange in a gas heat exchanger, and the gas after heat exchange is separated into carbon dioxide in a gas separator; the preheated methane gas and the carbon dioxide gas separated from the gas separator are introduced into a chemical reaction slag waste heat recovery device, and the rest coal gas after the carbon dioxide is separated is introduced into a blast furnace or directly utilized;
(2) introducing high-temperature furnace slag discharged from a blast furnace into a chemical reaction furnace slag waste heat recovery device, and carrying out gas-solid direct contact countercurrent heat exchange and methane reforming reaction heat storage on methane gas heated in a gas heat exchanger and carbon dioxide separated from a gas separator; introducing the generated gas after reaction into a blast furnace, and introducing the particles after primary cooling into an explicit heat exchange slag waste heat recovery device;
(3) air blown by a blower and high-temperature particles discharged from the chemical reaction slag waste heat recovery device perform countercurrent heat exchange in the explicit heat exchange slag waste heat recovery device, then preheated air is introduced into the blast furnace, and cooled slag is discharged; and completing multi-stage recovery.
Preferably, the chemical reaction slag waste heat recovery device carries out thermochemistry and explicit waste heat recovery and utilization on the high-temperature slag waste heat, the high-temperature slag moves from top to bottom, methane and carbon dioxide gas move from bottom to top, the methane reforming reaction energy storage is carried out after direct contact heat exchange, and the high-calorific-value gas after the reaction is introduced into the blast furnace to be used as fuel.
Preferably, the high-temperature slag provides a heat source for the chemical reaction and has catalysis and promotion effects on the chemical reaction.
Preferably, the explicit heat exchange slag waste heat recovery device preheats air by using the residual waste heat of the particles, the high-temperature particles move from top to bottom, the air moves from bottom to top, the preheated air is introduced into the blast furnace, and the temperature of the discharged particles is lower than 150 ℃.
Preferably, the methane in the gas heat exchanger and the blast furnace gas exhausted from the blast furnace perform countercurrent heat exchange, the high-temperature gas is used for preheating the methane, and the waste heat of the high-temperature gas is recovered; and separating carbon dioxide from the cooled blast furnace gas through a gas separator, introducing the carbon dioxide serving as a raw material into a chemical reaction slag waste heat recovery device for reforming reaction, and introducing the rest gas containing combustible components into the blast furnace or directly using the rest gas as fuel.
The invention mechanism of this patent is:
the invention provides a method for recovering waste heat of blast furnace slag and coal gas by utilizing a multi-stage waste heat recovery system through a chemical and physical recovery method. In chemical reaction slag waste heat recovery device, the temperature is 600 ~ 900 ℃ when discharging after the high temperature granule heat transfer, and the slag granule has good catalytic effect at this stage, both can regard as the heat carrier, can act as catalyst cocatalyst again, makes methane reforming reaction can go on better, carries out the chemical energy conversion with the partial sensible heat of slag high temperature, and methane gas also shows the partial high temperature waste heat of recovery simultaneously. Carbon monoxide and hydrogen after the methane reforming reaction are introduced into the blast furnace to be used as raw materials for continuous use, and after the blast furnace gas discharged from the blast furnace is cooled by the gas heat exchanger, carbon dioxide is separated from the blast furnace gas in a gas separation system to be used as the methane reforming raw materials, so that the recycling of partial raw materials is realized. The methane gas preheated by the gas heat exchanger can improve the methane conversion rate and improve the energy storage and waste heat utilization efficiency. The high-temperature furnace slag discharged by the chemical reaction furnace slag waste heat recovery device performs countercurrent heat exchange with air in the explicit heat exchange furnace slag waste heat recovery device, and the preheated gas is introduced into the blast furnace, so that the energy consumption is reduced.
Compared with the prior art, the beneficial effects are:
the invention has the following effects: (1) compared with the existing waste heat recovery system, the multi-stage recovery system adopting the blast furnace slag and the coal gas waste heat can realize the high-efficiency recovery of the slag waste heat and the coal gas waste heat by a chemical and physical combined method; (2) in the chemical reaction slag waste heat recovery device, the high-temperature slag is used as a heat carrier and a catalytic/cocatalyst for reforming reaction; (3) the multi-stage recovery system for the waste heat of the blast furnace slag and the coal gas can preheat methane gas participating in reforming reaction and air participating in combustion, so that the energy consumption is reduced, and the waste heat utilization rate is improved;
(4) the multi-stage recovery system for the blast furnace slag and the coal gas waste heat realizes the recycling of the raw materials and reduces the emission of carbon dioxide; (5) the multi-stage recovery system for the blast furnace slag and the coal gas waste heat has the advantages of simple flow, energy conservation, emission reduction, strong economic benefit and great popularization potential.
Drawings
FIG. 1 is a schematic structural diagram of a multi-stage blast furnace slag and gas waste heat recovery system according to the present invention;
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the drawings, it is only for convenience of description and simplicity of description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
The technical scheme of the invention is further described in detail by the following specific embodiments in combination with the attached drawings:
examples
Fig. 1 shows an embodiment of a multi-stage recovery system for blast furnace slag and coal gas waste heat according to the present invention, which mainly comprises a blast furnace 1, a chemical reaction slag waste heat recovery device 2, and an explicit heat exchange slag waste heat recovery device 3. The blast furnace 1 is provided with a gas input and output end and a slag output end, and the chemical reaction slag waste heat recovery device 2 and the explicit heat exchange slag waste heat recovery device 3 are provided with a gas input and output end and a slag output and input end; the input and output ends of the chemical reaction slag waste heat recovery device 2 are correspondingly connected with the input and output ends of the blast furnace 1 to form bidirectional communication; the input end of the explicit heat exchange slag waste heat recovery device 3 is connected with the output end of the chemical reaction slag waste heat recovery device 2, and the gas output end of the explicit heat exchange slag waste heat recovery device is connected with the input end of the blast furnace 1.
The chemical reaction slag waste heat recovery device 2 is a countercurrent direct contact heat exchange device and is used for thermochemically and explicitly recovering and utilizing high-temperature slag waste heat; the explicit heat exchange slag waste heat recovery device 3 is a gas-solid countercurrent heat exchange device and is used for recycling the residual slag waste heat.
In addition, the system also comprises a gas heat exchanger 5, a gas separator 6 and a natural gas storage tank 7; the input end of the gas separator 6 is respectively connected with the blast furnace 1 and the natural gas storage tank 7, and the output end of the gas separator is respectively connected with the gas heat exchanger 5 and the chemical reaction slag waste heat recovery device 2; and the output end of the input end of the gas separator 6 is respectively connected with the gas heat exchanger 5 and the chemical reaction slag waste heat recovery device 2.
Wherein, the explicit heat exchange slag waste heat recovery device 3 is connected with an air blower 4 for blowing air.
In addition, the temperature at the output end of the blast furnace 1 is 1000 ℃ or higher.
The invention provides a method for recovering waste heat of blast furnace slag and coal gas by utilizing a multi-stage waste heat recovery system through a chemical and physical recovery method. In chemical reaction slag waste heat recovery device 2, the temperature is at 600 ~ 900 degrees centigrade when discharging after the high temperature granule heat transfer, and the slag granule has good catalytic effect at this stage, both can regard as the heat carrier, can act as the catalyst again, makes methane reforming reaction can go on better, carries out the chemical energy conversion with slag high temperature part sensible heat, and methane gas is the partial high temperature waste heat of explicit recovery simultaneously also. Carbon monoxide and hydrogen after the methane reforming reaction are introduced into the blast furnace to be used as raw materials for continuous use, and after the blast furnace gas discharged from the blast furnace is cooled by the gas heat exchanger, carbon dioxide is separated from the blast furnace gas in a gas separation system to be used as the methane reforming raw materials, so that the recycling of partial raw materials is realized. The methane gas preheated by the gas heat exchanger can improve the methane conversion rate and improve the energy storage and waste heat utilization efficiency. The high-temperature slag discharged by the chemical reaction slag waste heat recovery device 2 and air perform countercurrent heat exchange in the explicit heat exchange slag waste heat recovery device 3, and the preheated gas is introduced into the blast furnace, so that the energy consumption is reduced.
The embodiment also provides a method for applying the multi-stage recovery system of the blast furnace slag and coal gas waste heat, which comprises the following specific implementation steps:
(1) the blast furnace gas discharged from the blast furnace 1 and the methane gas introduced from the natural gas tank 7 perform countercurrent heat exchange in the gas heat exchanger 5, and the cooled gas is separated into carbon dioxide in the gas separator 6; the preheated methane gas and the carbon dioxide gas separated from the gas separator 6 are introduced into the chemical reaction slag waste heat recovery device 2, and the rest coal gas after the carbon dioxide gas is separated is introduced into the blast furnace or directly utilized;
(2) introducing high-temperature furnace slag discharged from the blast furnace 1 into a chemical reaction furnace slag waste heat recovery device 2, and carrying out gas-solid direct contact countercurrent heat exchange and methane reforming reaction heat storage on the heated methane gas in a gas heat exchanger 5 and the carbon dioxide separated from a gas separator 6 in the chemical reaction furnace slag waste heat recovery device 2; introducing the generated gas after the reaction into a blast furnace 1, and introducing the particles after primary cooling into an explicit heat exchange slag waste heat recovery device 3;
(3) air blown by the blower 4 and high-temperature particles discharged from the chemical reaction slag waste heat recovery device 2 perform countercurrent heat exchange in the explicit heat exchange slag waste heat recovery device 3, and then preheated air is introduced into the blast furnace (1) and cooled slag is discharged; and completing multi-stage recovery.
The chemical reaction slag waste heat recovery device 2 absorbs and stores partial high-temperature waste heat of the slag by utilizing methane reforming reaction, the high-temperature slag moves from top to bottom, methane and carbon dioxide gas move from bottom to top, the methane reforming reaction is carried out after direct contact heat exchange for energy storage, and the high-calorific-value gas after the reaction is introduced into a blast furnace to be used as fuel.
In addition, the explicit heat exchange slag waste heat recovery device 3 preheats air by using the residual waste heat of the particles, the high-temperature particles move from top to bottom, the air moves from bottom to top, the preheated air is introduced into the blast furnace, and the temperature of the discharged particles is lower than 150 ℃.
Wherein, the methane in the gas heat exchanger 5 exchanges heat with blast furnace gas exhausted from the blast furnace in a counter-current manner, the methane is preheated by utilizing the high-temperature gas, and the waste heat of the high-temperature gas is recovered. The cooled blast furnace gas is separated out carbon dioxide through a gas separator 6 and is used as a raw material to be introduced into a chemical reaction slag waste heat recovery device 2 for reforming reaction, and the rest gas containing combustible components can be used as fuel directly or is introduced into a blast furnace.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (7)
1. A multi-stage recovery system for blast furnace slag and coal gas waste heat is characterized by mainly comprising a blast furnace (1), a chemical reaction slag waste heat recovery device (2) and an explicit heat exchange slag waste heat recovery device (3); the blast furnace (1) is provided with a gas input end and a slag output end, and the chemical reaction slag waste heat recovery device (2) and the explicit heat exchange slag waste heat recovery device (3) are provided with a gas input end and a slag output end; the input and output ends of the chemical reaction slag waste heat recovery device (2) are correspondingly connected with the input and output ends of the blast furnace (1) to form bidirectional communication; the input end of the explicit heat exchange slag waste heat recovery device (3) is connected with the output end of the chemical reaction slag waste heat recovery device (2), and the gas output end of the explicit heat exchange slag waste heat recovery device is connected with the input end of the blast furnace (1);
the system also comprises a gas heat exchanger (5), a gas separator (6) and a natural gas storage tank (7); the input end of the gas separator (6) is respectively connected with the blast furnace (1) and the natural gas storage tank (7), and the output end of the gas separator is respectively connected with the gas heat exchanger (5) and the chemical reaction slag waste heat recovery device (2); the input end and the output end of the gas separator (6) are respectively connected with the gas heat exchanger (5) and the chemical reaction slag waste heat recovery device (2);
the explicit heat exchange slag waste heat recovery device (3) is connected with an air blower (4) used for blowing air.
2. The multi-stage recovery system for the waste heat of blast furnace slag and coal gas as claimed in claim 1, wherein the chemical reaction slag waste heat recovery device (2) is a countercurrent direct contact heat exchange device; the explicit heat exchange slag waste heat recovery device (3) is a gas-solid countercurrent heat exchange device.
3. The multi-stage recovery system for blast furnace slag and gas waste heat according to claim 1, characterized in that the temperature at the output end of the blast furnace (1) is greater than or equal to 1000 ℃.
4. The method for applying the multi-stage recovery system of the blast furnace slag and the coal gas waste heat according to any one of claims 1 to 3 is characterized by comprising the following specific steps of:
(1) the blast furnace gas discharged from the blast furnace (1) and the methane gas introduced from the natural gas storage tank (7) perform countercurrent heat exchange in the gas heat exchanger (5), and the gas after heat exchange is separated into carbon dioxide in the gas separator (6); the preheated methane gas and the carbon dioxide gas separated from the gas separator (6) are introduced into a chemical reaction slag waste heat recovery device (2), and the rest coal gas after the carbon dioxide is separated is introduced into a blast furnace or directly utilized;
(2) introducing high-temperature slag discharged from the blast furnace (1) into a chemical reaction slag waste heat recovery device (2), and carrying out gas-solid direct contact countercurrent heat exchange and methane reforming reaction heat storage on methane gas heated in a gas heat exchanger (5) and carbon dioxide separated in a gas separator (6); introducing the generated gas after reaction into a blast furnace (1), and introducing the particles after primary cooling into an explicit heat exchange slag waste heat recovery device (3);
(3) air blown by the blower (4) and high-temperature particles discharged from the chemical reaction slag waste heat recovery device (2) perform countercurrent heat exchange in the explicit heat exchange slag waste heat recovery device (3), then preheated air is introduced into the blast furnace (1), and cooled slag is discharged; completing multi-stage recovery;
the methane in the gas heat exchanger (5) exchanges heat with blast furnace gas discharged from the blast furnace in a counter-current manner, the methane is preheated by using high-temperature gas, and the waste heat of the high-temperature gas is recovered; the cooled blast furnace gas is separated into carbon dioxide by a gas separator (6), and the rest gas containing combustible components is directly used as fuel or is led back to the blast furnace; the preheated methane and the separated carbon dioxide are used as raw materials and are introduced into a chemical reaction slag waste heat recovery device (2) for reforming reaction.
5. The method of the multi-stage blast furnace slag and gas waste heat recovery system according to claim 4, wherein the chemical reaction slag waste heat recovery device (2) performs thermochemistry and explicit waste heat recovery and utilization on the high temperature slag waste heat, the high temperature slag moves from top to bottom, methane and carbon dioxide gas move from bottom to top, the methane reforming reaction is performed to store energy after direct contact heat exchange, the high calorific value gas after the reaction is introduced into the blast furnace as fuel, and part of sensible heat is recovered.
6. The method of the multi-stage recovery system of the blast furnace slag and the coal gas waste heat according to claim 5, characterized in that: the high-temperature slag provides a heat source for chemical reaction and plays a role in catalyzing and promoting the chemical reaction.
7. The method of the multi-stage blast furnace slag and gas waste heat recovery system according to claim 4, wherein the explicit heat exchange slag waste heat recovery device (3) preheats air by using the residual heat of the particles, the high-temperature particles move from top to bottom, the air moves from bottom to top, the preheated air is introduced into the blast furnace, and the temperature of the discharged particles is lower than 150 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911144298.2A CN110982966B (en) | 2019-11-20 | 2019-11-20 | Multi-stage recovery system and method for blast furnace slag and coal gas waste heat |
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| CN113913571A (en) * | 2021-09-30 | 2022-01-11 | 武汉钢铁有限公司 | Device for separating carbon dioxide in blast furnace gas by using metallurgical slag and separation method thereof |
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| CN103787277B (en) * | 2014-01-15 | 2015-09-30 | 中钢集团鞍山热能研究院有限公司 | A kind of utilize blast-furnace cement sensible heat to carry out reforming of methane on Ni-Ce method and device |
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