CN117167970A - High-temperature preheating device for coal gas - Google Patents
High-temperature preheating device for coal gas Download PDFInfo
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- CN117167970A CN117167970A CN202311145546.1A CN202311145546A CN117167970A CN 117167970 A CN117167970 A CN 117167970A CN 202311145546 A CN202311145546 A CN 202311145546A CN 117167970 A CN117167970 A CN 117167970A
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- temperature
- blast furnace
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- 239000003034 coal gas Substances 0.000 title claims description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 89
- 239000007789 gas Substances 0.000 claims description 286
- 238000002485 combustion reaction Methods 0.000 claims description 127
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 106
- 229910052757 nitrogen Inorganic materials 0.000 claims description 50
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 36
- 239000003546 flue gas Substances 0.000 claims description 36
- 230000001105 regulatory effect Effects 0.000 claims description 22
- 238000009825 accumulation Methods 0.000 claims description 16
- 230000001172 regenerating effect Effects 0.000 claims description 8
- 239000000571 coke Substances 0.000 claims description 6
- 239000011819 refractory material Substances 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 5
- 230000009467 reduction Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 16
- 230000008569 process Effects 0.000 description 11
- 238000003723 Smelting Methods 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910001873 dinitrogen Inorganic materials 0.000 description 6
- 238000010926 purge Methods 0.000 description 5
- 239000000446 fuel Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000010310 metallurgical process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a gas high-temperature preheating device, which comprises: the high-temperature preheating device for the gas has the characteristics of wide application range, high heating temperature, stable operation, safety, reliability, low operation cost, carbon reduction, emission reduction, long service life and the like.
Description
Technical Field
The invention relates to the technical field of iron making in the iron and steel industry, in particular to a coal gas high-temperature preheating device.
Background
In the metallurgical industry at home and abroad, the blast furnace ironmaking process technology is mature, the production capacity is high, the efficiency is high, the blast furnace ironmaking method is a mainstream ironmaking method, but the blast furnace ironmaking method uses coke and coal dust as reducing agents and fuels, the energy consumption is high, the carbon emission is high, and the environmental pollution is high. In order to ensure green sustainable development of the iron and steel industry, reduce the dependence of an iron-making process on metallurgical coke, realize low-carbonization smelting and achieve the aim of reducing consumption and carbon, new iron-making technology is continuously emerging, wherein the top gas of a process kiln such as a blast furnace, a shaft furnace and the like is subjected to CO 2 The technology of recycling after removal, improving the utilization rate of coal gas and reducing the consumption of carbon fuel has wide prospect.
By CO in gas 2 After the removal, the CO proportion in the gas is increased, and the gas can be used as reducing gas for recycling, so that the consumption of carbon fuel is reduced. In order to achieve the chemical reaction condition and improve the reaction speed, the circulating top gas needs to be preheated at high temperature, but the traditional gas preheating process can only heat the gas to about 200 ℃ through different types of metal heat exchangers, and the circulating smelting of the top gas is not satisfiedThe temperature requirement for refining is needed, so how to provide a safe and reliable preheating device capable of continuously conveying high-temperature coal gas is a technical problem to be solved at present.
Disclosure of Invention
The invention mainly aims to provide a gas high-temperature preheating device, which aims to solve the technical problem that in the prior art, only gas can be heated to about 200 ℃ and the temperature requirement required by top gas circulation smelting cannot be met.
In order to achieve the above object, the present invention provides a gas high temperature preheating device, comprising: the system comprises a gas heating furnace, a blast furnace gas combustion valve, a blast furnace gas shut-off valve, a blast furnace gas regulating valve, a blast furnace gas branch pipe, a nitrogen branch pipe shut-off valve, a nitrogen branch pipe, a combustion air combustion valve, a combustion air regulating valve, a combustion air branch pipe, a combustion air inlet pipe, a nitrogen inlet pipe shut-off valve, a nitrogen inlet pipe, a blast furnace gas inlet pipe, a high temperature gas conveying pipe, a high temperature gas branch pipe shut-off valve, a low temperature gas inlet pipe, a low temperature gas branch pipe shut-off valve, a flue gas branch pipe, a flue gas main pipe and a chimney.
Optionally, the blast furnace gas incoming pipe is connected with the gas heating furnace through a blast furnace gas branch pipe, the connection part is positioned at the upper part of the gas heating furnace, the blast furnace gas combustion valve, the blast furnace gas shut-off valve and the blast furnace gas regulating valve are sequentially positioned on the blast furnace gas branch pipe, the combustion air incoming pipe is connected with the gas heating furnace through a combustion air branch pipe, the connection part is positioned at the upper part of the gas heating furnace, and the combustion air combustion valve and the combustion air regulating valve are sequentially positioned on the combustion air branch pipe.
Optionally, the gas heating furnace comprises a combustor, a combustion chamber and a heat accumulation chamber, wherein the combustor is positioned at the upper part of the gas heating furnace and is provided with the combustion chamber and the heat accumulation chamber in sequence downwards, and the heat accumulation chamber is made of a porous refractory material.
Optionally, the flue gas branch pipe is connected with the gas heating furnace, the connection part is positioned at the lower part of the gas heating furnace, the flue gas branch pipe cutting-off valve is positioned on the flue gas branch pipe, and the flue gas main pipe is used for connecting the flue gas branch pipe with a chimney.
Optionally, the low-temperature gas incoming pipe is connected with the gas heating furnace through a low-temperature gas branch pipe, the connection part is positioned at the lower part of the gas heating furnace, the low-temperature gas branch pipe cut-off valve is positioned on the low-temperature gas branch pipe, the high-temperature gas conveying pipe is connected with the gas heating furnace through a high-temperature gas branch pipe, the connection part is positioned at the middle part of the gas heating furnace, the high-temperature gas branch pipe cut-off valve is positioned on the high-temperature gas branch pipe, and the high-temperature gas is heated low-temperature gas.
Optionally, the low-temperature gas can be blast furnace gas, coke oven gas, converter gas, hydrogen-rich gas, or CO removal gas 2 、N 2 Or H 2 And mixing one or more of the enriched gas after O.
Optionally, the nitrogen incoming pipe is connected with the blast furnace gas branch pipe and the combustion air branch pipe through nitrogen branch pipes respectively, the joint of the nitrogen incoming pipe and the blast furnace gas branch pipe is positioned between the blast furnace gas combustion valve and the blast furnace gas shut-off valve, the joint of the nitrogen incoming pipe and the combustion air branch pipe is positioned between the combustion air combustion valve and the gas heating furnace and is positioned near the combustion air combustion valve, the nitrogen branch pipe shut-off valve is positioned on the nitrogen branch pipe, and the nitrogen incoming pipe shut-off valve is positioned on the nitrogen incoming pipe.
Optionally, the gas heating furnace is a regenerative heating furnace.
The main advantages of the invention include:
the high-temperature preheating device for the coal gas is characterized in that a coal gas heating furnace, a blast furnace gas combustion valve, a blast furnace gas shut-off valve, a blast furnace gas regulating valve, a blast furnace gas branch pipe, a nitrogen branch pipe shut-off valve, a nitrogen branch pipe, a combustion air combustion valve, a combustion air regulating valve, a combustion air branch pipe, a combustion air inlet pipe, a nitrogen inlet pipe, a blast furnace gas inlet pipe, a high-temperature coal gas conveying pipe, a high-temperature coal gas branch pipe shut-off valve, a low-temperature coal gas inlet pipe, a low-temperature coal gas branch pipe shut-off valve, a flue gas branch pipe, a flue gas main pipe and a chimney are arranged, refractory materials are used as heat accumulators for heat exchange, the heating capacity is high, the service life is long, and the operation cost is low; is suitable for different metallurgical process flows, includingBlast furnace ironmaking process, smelting reduction ironmaking process, etc.; can stably convey high-temperature gas with the temperature of more than 1000 ℃ for a blast furnace, wherein the gas can be blast furnace gas, coke oven gas, converter gas, hydrogen-rich gas and CO removal 2 、N 2 Or H 2 One or more mixed gases in the enriched gas after O strengthens blast furnace smelting and reduces blast furnace CO 2 Discharge amount; the gas high-temperature preheating device can be flexibly adapted to the furnace capacity, smelting strength, process flow, working system, gas condition and the like of different blast furnaces, and has wide application range; the method is not only suitable for new construction projects, but also suitable for large modification construction projects, and can utilize the old hot blast stove to carry out gas heating furnace transformation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the structure of the present invention;
reference numerals: the gas heating furnace 1, the blast furnace gas combustion valve 2, the blast furnace gas shut-off valve 3, the blast furnace gas regulating valve 4, the blast furnace gas branch pipe 5, the nitrogen branch pipe shut-off valve 6, the nitrogen branch pipe 7, the combustion air combustion valve 8, the combustion air regulating valve 9, the combustion air branch pipe 10, the combustion air inlet pipe 11, the nitrogen inlet pipe shut-off valve 12, the nitrogen inlet pipe 13, the blast furnace gas inlet pipe 14, the high temperature gas conveying pipe 15, the high temperature gas branch pipe 16, the high temperature gas branch pipe shut-off valve 17, the low temperature gas inlet pipe 18, the low temperature gas branch pipe 19, the low temperature gas branch pipe shut-off valve 20, the flue gas branch pipe shut-off valve 21, the flue gas branch pipe 22, the flue gas main pipe 23 and the chimney 24.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
Fig. 1 is a schematic structural diagram of the present invention, and as shown in fig. 1, the present invention provides a gas high temperature preheating device, including: the gas heating furnace 1, the blast furnace gas combustion valve 2, the blast furnace gas shut-off valve 3, the blast furnace gas regulating valve 4, the blast furnace gas branch pipe 5, the nitrogen branch pipe shut-off valve 6, the nitrogen branch pipe 7, the combustion air combustion valve 8, the combustion air regulating valve 9, the combustion air branch pipe 10, the combustion air inlet pipe 11, the nitrogen inlet pipe shut-off valve 12, the nitrogen inlet pipe 13, the blast furnace gas inlet pipe 14, the high temperature gas conveying pipe 15, the high temperature gas branch pipe 16, the high temperature gas branch pipe shut-off valve 17, the low temperature gas inlet pipe 18, the low temperature gas branch pipe 19, the low temperature gas branch pipe shut-off valve 20, the flue gas branch pipe shut-off valve 21, the flue gas branch pipe 22, the flue gas main pipe 23 and the chimney 24.
The blast furnace gas inlet pipe 14 is connected with the gas heating furnace 1 through a blast furnace gas branch pipe 5, and the connection part is positioned at the upper part of the gas heating furnace 1 to provide a fuel source for the combustion heat accumulation of the gas heating furnace 1. The blast furnace gas combustion valve 2, the blast furnace gas shut-off valve 3 and the blast furnace gas regulating valve 4 are sequentially arranged on the blast furnace gas branch pipe 5 and are used for shutting off and regulating the blast furnace gas quantity entering the gas heating furnace 1. The combustion air inlet pipe 11 is connected with the gas heating furnace 1 through a combustion air branch pipe 10, and the connection part is positioned at the upper part of the gas heating furnace 1 to provide combustion air for combustion heat accumulation of the gas heating furnace 1. The combustion air combustion valve 8 and the combustion air regulating valve 9 are sequentially arranged on the combustion air branch pipe 10 and used for cutting off and regulating the combustion air quantity entering the gas heating furnace 1.
The gas heating furnace 1 comprises a burner, a combustion chamber and a heat accumulation chamber, wherein the burner, the combustion chamber and the heat accumulation chamber are formed by building an outer steel shell and an inner refractory material, the burner is positioned at the upper part of the gas heating furnace 1, the combustion chamber and the heat accumulation chamber are arranged downwards in sequence, a blast furnace gas branch pipe 5 is fed into the gas heating furnace 1, blast furnace gas and combustion air in the gas heating furnace 1 enter a combustion air branch pipe 10 to be shunted and mixed through the burner, the combustion air is injected into the combustion chamber to be combusted, high-temperature flue gas generated after the combustion passes through the heat accumulation chamber to heat the refractory material of the heat accumulation chamber, and the heat accumulation chamber is composed of the refractory material with holes.
The flue gas branch pipe 22 is connected with the gas heating furnace 1, and the connection part is positioned at the lower part of the gas heating furnace 1 and is used for discharging flue gas after heating the regenerator in the gas heating furnace 1. The gas-fired furnace 1 is characterized in that the gas-fired branch pipe 22 cut-off valves 21 are arranged on the gas-fired branch pipe 22, the gas-fired main pipe 23 connects the gas-fired branch pipe 22 with the chimney 24, and the gas-fired main pipe 23 collects the gas exhausted from the gas-fired furnace 1 and is exhausted from the chimney 24.
The low-temperature gas inlet pipe 18 is connected with the gas heating furnace 1 through a low-temperature gas branch pipe 19, the connection part is positioned at the lower part of the gas heating furnace 1, the low-temperature gas branch pipe cut-off valve 20 is positioned on the low-temperature gas branch pipe 19, the high-temperature gas conveying pipe 15 is connected with the gas heating furnace 1 through a high-temperature gas branch pipe 16, the connection part is positioned at the middle part of the gas heating furnace 1, the high-temperature gas branch pipe cut-off valve 17 is positioned on the high-temperature gas branch pipe 16, the low-temperature gas conveyed into the gas heating furnace 1 by the low-temperature gas branch pipe 19 flows into a regenerator from the lower part of the gas heating furnace 1, becomes high-temperature gas after passing through the regenerator, and enters the high-temperature gas branch pipe 16 from the top of the regenerator, and is blown into a blast furnace or a smelting reduction furnace through the high-temperature gas conveying pipe 15.
The low-temperature gas can be blast furnace gas, coke oven gas, converter gas, hydrogen-rich gas and CO removal 2 、N 2 Or H 2 And mixing one or more of the enriched gas after O.
The nitrogen gas incoming pipe 13 is respectively connected with the blast furnace gas branch pipe 5 and the combustion air branch pipe 10 through the nitrogen branch pipe 7, the joint of the nitrogen gas incoming pipe 13 and the blast furnace gas branch pipe 5 is positioned between the blast furnace gas combustion valve 2 and the blast furnace gas shut-off valve 3, the joint of the nitrogen gas incoming pipe 3 and the combustion air branch pipe 10 is positioned between the combustion air combustion valve 8 and the gas heating furnace 1 and the joint of the nitrogen gas incoming pipe 13 is positioned near the combustion air combustion valve 8, the nitrogen branch pipe shut-off valve 6 is positioned on the nitrogen branch pipe 7, and the nitrogen gas incoming pipe shut-off valve 12 is positioned on the nitrogen gas incoming pipe 13.
The gas heating furnace 1 is a regenerative heating furnace, the principle of heating gas is that high-temperature flue gas generated by burning blast furnace gas firstly is regenerative heat transfer, low-temperature gas is introduced after sufficient heat is accumulated in the regenerative heating furnace, the low-temperature gas is heated into high-temperature gas through heat transfer of a regenerative chamber, and when the heat of the regenerative chamber is insufficient, the gas heating furnace 1 is converted into combustion state to be regenerative supplementary heat.
The gas heating furnace 1 can be divided into three working states, namely combustion, air supply and choke plug, and the gas high-temperature preheating process is generally set into two gas heating furnaces 1 to form a working system of combustion and air supply, or three gas heating furnaces 1 can be set, two working systems of combustion and air supply are adopted, or four gas heating furnaces 1 are set, and two working systems of combustion and air supply are adopted.
The gas heating furnace 1 is switched back and forth under the two states of combustion and air supply, and each switching needs to undergo a process of choke plug, namely choke plug combustion, combustion choke plug, choke plug conversion air supply and air supply choke plug, when the combustion choke plug is rotated, the nitrogen branch pipe 7 cut-off valve 6 needs to be opened to purge nitrogen for the combustion air branch pipe 10 and the burner, residual oxygen is removed, and the safety in the choke plug air-transferring state furnace is ensured; when the air supply is changed into the choke plug, the shut-off valve 6 of the nitrogen branch pipe 7 is required to be opened to purge the combustion air branch pipe 10, the blast furnace gas branch pipe 5 and the burner with nitrogen, residual gas is removed, the safety in the furnace in the choke plug-in combustion state is ensured, nitrogen used for purging the nitrogen inlet pipe 13 is taken from a nitrogen pipe network in a factory, and a primary air storage tank can be arranged for ensuring the flow and the pressure of the purged nitrogen.
The blast furnace gas conveyed into the gas heating furnace 1 by the blast furnace gas inlet pipe 14 can be directly taken from a blast furnace gas pipe network, can be preheated by a heat exchanger and then conveyed into the gas heating furnace 1, and the combustion air conveyed into the gas heating furnace 1 by the combustion air inlet pipe 11 can be directly taken from a combustion fan, can be preheated by the heat exchanger and then conveyed into the gas heating furnace 1.
The flue gas on the flue gas main pipe 23 can also be sent into a heat exchanger to participate in heat exchange to preheat blast furnace gas, combustion air or other gases needing to be preheated before being discharged from the chimney 24.
Specifically, two gas heating furnaces are arranged by a gas high-temperature preheating process to form a combustion and air supply working system.
When the gas heating furnace 1 works, the gas heating furnace is switched back and forth in two states of combustion and air supply, and each switching needs to go through a smoldering process. The method is characterized in that the choke plug is changed into combustion, combustion is changed into choke plug, the choke plug is changed into air supply, and the air supply is changed into choke plug.
The smoldering furnace rotates for combustion, a flue gas branch pipe cut-off valve 21 is opened, a combustion air combustion valve 8 and a combustion air regulating valve 9 are opened, and combustion air flows into the gas heating furnace 1 through a combustion air inlet pipe 11 and a combustion air branch pipe 10; the blast furnace gas combustion valve 2, the blast furnace gas cut-off valve 3 and the blast furnace gas regulating valve 4 are opened, and the blast furnace gas flows into the gas heating furnace 1 through the blast furnace gas inlet pipe 14 and the blast furnace gas branch pipe 5; the blast furnace gas and combustion air are split-flow and injected into a combustion chamber to burn in a burner of the gas heating furnace 1, high-temperature flue gas generated by burning can be controlled at 1100-1350 ℃, at the moment, the nitrogen branch pipe cut-off valve 6, the high-temperature gas branch pipe cut-off valve 17 and the low-temperature gas branch pipe cut-off valve 20 are in a closed state, the high-temperature flue gas generated by burning flows through a regenerator to heat the regenerator, the flue gas is reserved from a flue gas branch pipe 22 at the lower part of the gas heating furnace 1 and is discharged through a flue gas main pipe 23 and a chimney 24.
The regenerator can be switched to the next state after accumulating enough heat.
The combustion is carried out in a smoldering furnace, the combustion air combustion valve 8 and the combustion air regulating valve 9 are closed, the nitrogen branch pipe shut-off valve 6 is opened to purge nitrogen to the combustion air branch pipe 10 and the burner of the gas heating furnace 1, residual oxygen is removed, the blast furnace gas combustion valve 2, the blast furnace gas shut-off valve 3 and the blast furnace gas regulating valve 4 are closed, and the flue gas branch pipe shut-off valve 21 is closed.
And in the next step, furnace choke plug is carried out, a low-temperature gas branch pipe cut-off valve 20 and a high-temperature gas branch pipe cut-off valve 17 are opened, low-temperature gas flows into the gas heating furnace 1 through a low-temperature gas inlet pipe 18 and a low-temperature gas branch pipe 19, the low-temperature gas flows through a heat accumulation chamber to be heated, can be heated to more than 1000 ℃, and the heated high-temperature gas is reserved from the high-temperature gas branch pipe 16 and a high-temperature gas conveying pipe 15 and is conveyed to high-temperature gas users such as a blast furnace.
As the supply of air progresses, the heat accumulation in the regenerator gradually decreases, and when the heat is insufficient to heat the gas, the regenerator is converted into the next state.
And (3) blowing to smolder the furnace, closing the low-temperature gas branch pipe shut-off valve 20 and the high-temperature gas branch pipe shut-off valve 17, opening the nitrogen branch pipe shut-off valve 6 to purge the combustion air branch pipe 10, the blast furnace gas branch pipe 5 and the gas heating furnace 1 with nitrogen, removing residual gas, and closing the nitrogen branch pipe shut-off valve 6.
And in the next step, the furnace is subjected to smoldering and burning to store heat for the gas heating furnace 1. The gas heating furnace 1 is operated in these states in a cyclic manner. The two gas heating furnaces are configured to form a combustion system and an air supply system, so that continuous and stable high-temperature gas is provided for blast furnace ironmaking or smelting reduction ironmaking.
The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all the equivalent structural changes made by the description of the present invention and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (8)
1. The utility model provides a coal gas high temperature preheating device which characterized in that: comprising the following steps: the gas heating furnace comprises a gas heating furnace (1), a blast furnace gas combustion valve (2), a blast furnace gas shut-off valve (3), a blast furnace gas regulating valve (4), a blast furnace gas branch pipe (5), a nitrogen branch pipe shut-off valve (6), a nitrogen branch pipe (7), a combustion air combustion valve (8), a combustion air regulating valve (9), a combustion air branch pipe (10), a combustion air inlet pipe (11), a nitrogen inlet pipe shut-off valve (12), a nitrogen inlet pipe (13), a blast furnace gas inlet pipe (14), a high-temperature gas conveying pipe (15), a high-temperature gas branch pipe (16), a high-temperature gas branch pipe shut-off valve (17), a low-temperature gas inlet pipe (18), a low-temperature gas branch pipe (19), a low-temperature gas branch pipe shut-off valve (20), a flue gas branch pipe shut-off valve (21), a flue gas branch pipe (22), a flue gas main pipe (23) and a chimney (24).
2. The gas high-temperature preheating device according to claim 1, wherein the blast furnace gas inlet pipe (14) is connected with the gas heating furnace (1) through a blast furnace gas branch pipe (5), the connection part is positioned at the upper part of the gas heating furnace (1), the blast furnace gas combustion valve (2), the blast furnace gas cut-off valve (3) and the blast furnace gas regulating valve (4) are sequentially positioned on the blast furnace gas branch pipe (5), the combustion air inlet pipe (11) is connected with the gas heating furnace (1) through a combustion air branch pipe (10), the connection part is positioned at the upper part of the gas heating furnace (1), and the combustion air combustion valve (8) and the combustion air regulating valve (9) are sequentially positioned on the combustion air branch pipe (10).
3. The gas high-temperature preheating device according to claim 1, wherein the gas heating furnace (1) comprises a burner, a combustion chamber and a heat accumulation chamber, the burner is positioned at the upper part of the gas heating furnace (1), the combustion chamber and the heat accumulation chamber are arranged downwards in sequence, and the heat accumulation chamber is made of a porous refractory material.
4. A gas high temperature preheating device according to claim 1, characterized in that the flue gas branch pipe (22) is connected with the gas heating furnace (1), the connection is positioned at the lower part of the gas heating furnace (1), the shut-off valve (21) of the flue gas branch pipe (22) is positioned on the flue gas branch pipe (22), and the flue gas main pipe (23) connects the flue gas branch pipe (22) with the chimney (24).
5. The gas high-temperature preheating device according to claim 1, wherein the low-temperature gas inlet pipe (18) is connected with the gas heating furnace (1) through a low-temperature gas branch pipe (19), the connection part is positioned at the lower part of the gas heating furnace (1), the low-temperature gas branch pipe cut-off valve (20) is positioned on the low-temperature gas branch pipe (19), the high-temperature gas conveying pipe (15) is connected with the gas heating furnace (1) through a high-temperature gas branch pipe (16), the connection part is positioned at the middle part of the gas heating furnace (1), the high-temperature gas branch pipe cut-off valve (17) is positioned on the high-temperature gas branch pipe (16), and the high-temperature gas is heated low-temperature gas.
6. The gas high-temperature preheating device according to claim 5, wherein the low-temperature gas can be blast furnace gas, coke oven gas, converter gas, hydrogen-rich gas, CO removal 2 、N 2 Or H 2 And mixing one or more of the enriched gas after O.
7. A gas high temperature preheating device according to claim 1, characterized in that the nitrogen inlet pipe (13) is connected with the blast furnace gas branch pipe (5) and the combustion air branch pipe (10) through the nitrogen branch pipe (7), the connection part with the blast furnace gas branch pipe (5) is positioned between the blast furnace gas combustion valve (2) and the blast furnace gas shut-off valve (3), the connection part with the combustion air branch pipe (10) is positioned between the combustion air combustion valve (8) and the gas heating furnace (1), the connection part with the combustion air branch pipe (10) is positioned near the combustion air combustion valve (8), the nitrogen branch pipe shut-off valve (6) is positioned on the nitrogen branch pipe (7), and the nitrogen inlet pipe shut-off valve (12) is positioned on the nitrogen inlet pipe (13).
8. The gas high-temperature preheating device according to claim 1, wherein the gas heating furnace (1) is a regenerative heating furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311145546.1A CN117167970A (en) | 2023-09-06 | 2023-09-06 | High-temperature preheating device for coal gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311145546.1A CN117167970A (en) | 2023-09-06 | 2023-09-06 | High-temperature preheating device for coal gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117167970A true CN117167970A (en) | 2023-12-05 |
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| CN202311145546.1A Pending CN117167970A (en) | 2023-09-06 | 2023-09-06 | High-temperature preheating device for coal gas |
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