CN113005250A - System and working process for preparing hydrogen-rich gas and applying hydrogen-rich gas to blast furnace injection - Google Patents

System and working process for preparing hydrogen-rich gas and applying hydrogen-rich gas to blast furnace injection Download PDF

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Publication number
CN113005250A
CN113005250A CN202110430896.7A CN202110430896A CN113005250A CN 113005250 A CN113005250 A CN 113005250A CN 202110430896 A CN202110430896 A CN 202110430896A CN 113005250 A CN113005250 A CN 113005250A
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gas
temperature
hydrogen
coal
furnace
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Inventor
刘卫东
徐连友
岳文超
刘泽阳
胡俊波
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Hebei Yangang Technology Co ltd
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Hebei Yangang Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/001—Injecting additional fuel or reducing agents
    • C21B5/003—Injection of pulverulent coal
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/46—Gasification of granular or pulverulent flues in suspension
    • C10J3/48—Apparatus; Plants
    • C10J3/50—Fuel charging devices
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/58—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels combined with pre-distillation of the fuel
    • C10J3/60—Processes
    • C10J3/64—Processes with decomposition of the distillation products
    • C10J3/66—Processes with decomposition of the distillation products by introducing them into the gasification zone
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0953—Gasifying agents
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0953—Gasifying agents
    • C10J2300/0959—Oxygen
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0953—Gasifying agents
    • C10J2300/0973—Water
    • C10J2300/0976—Water as steam
    • 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
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines

Abstract

The invention discloses a system for preparing hydrogen-rich gas and injecting a blast furnace and a working process. The system realizes the coupled linkage operation of hydrogen-rich gas preparation, a gas injection system and blast furnace ironmaking, and realizes the working flow of hot charging and hot delivery of high-temperature coke breeze and delivery of high-temperature gas into the furnace; the preparation process can obtain the hydrogen-rich gas with high heat value, has good coal adaptability and high carbon conversion rate, effectively improves the utilization rate of coal energy, and puts the hydrogen-rich gas into considerationFully blown into the blast furnace for reduction smelting, thereby improving the content of H in the reducing atmosphere of the blast furnace2The proportion can improve the reduction reaction speed in the furnace, reduce the direct reduction reaction of carbon, reduce the coke consumption and reduce the smelting cost; meanwhile, the discharge amount of the carbon dioxide of the blast furnace is greatly reduced.

Description

System and working process for preparing hydrogen-rich gas and applying hydrogen-rich gas to blast furnace injection
Technical Field
The invention relates to the technical field of iron making and energy utilization, in particular to a system for preparing hydrogen-rich gas and using the hydrogen-rich gas for blast furnace injection and a working process of the system.
Background
The current blast furnace ironmaking technology is continuously improved and perfected for a long time and is developed into a mature and advanced production process. However, the blast furnace process still has a plurality of problems, especially under the situation that the state strongly advocates low carbon emission reduction and severe environmental protection, the blast furnace process is used as CO2The pressure of the steel industry is enormous. Meanwhile, the contradiction between the large consumption of the blast furnace coke and the small storage capacity of the blast furnace coke and the energy source structure of rich coal, less gas and poor oil will bring crisis to the subsequent development of the blast furnace.
The hydrogen is used as a reducing agent for blast furnace smelting to replace part of coke, and compared with the existing carbon-based reducing agent, the hydrogen can generate H when reducing iron ore2O, more favorable for reducing CO2And (5) discharging.
Disclosure of Invention
The invention aims to provide a system for preparing hydrogen-rich gas and using the hydrogen-rich gas for blast furnace injection, which solves the problem of CO in the current blast furnace ironmaking technology2The problem of high emission.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a system for preparing hydrogen-rich gas and injecting the hydrogen-rich gas into a blast furnace, which comprises two sections of furnaces, wherein the top of the high-temperature side of each section of furnace is provided with an ignition device, and the side wall of each section of furnace is sequentially provided with a powdered coke inlet and a high-temperature gasifying agent inlet from top to bottom;
the side walls of the low-temperature sides of the two sections of furnaces are provided with pulverized coal inlets, the tops of the low-temperature sides of the two sections of furnaces are connected with inlets of gas-solid separation devices, gas outlets at the upper parts of the gas-solid separation devices are sequentially connected with a gas heat exchanger, a waste heat boiler, a dust removal device and a primary gas pressurizer, and solid outlets at the lower parts of the gas-solid separation devices are connected to a pneumatic conveying system;
the outlet of the dust removal device is divided into two paths, wherein one path is communicated with the inlet of the secondary gas pressurizer, the outlet of the secondary gas pressurizer is communicated with the gas heat exchanger, and the gas heat exchanger is connected with the blast furnace through a gas injection system; the other path of the outlet of the dust removal device is connected with an inlet of a primary gas pressurizer, the outlet of the primary gas pressurizer is connected with the inlet end of the pneumatic conveying system, and the outlet end of the pneumatic conveying system is connected with the powdered coke inlet; and the high-temperature gasifying agent inlet is connected with a gasifying agent injection system.
Preferably, the pulverized coal inlet is connected with a pulverized coal preparation system, and the pulverized coal preparation system comprises a raw coal bunker, a crusher, a pulverized coal bunker, a coal mill, a coarse coal separator and a pulverized coal feeder which are sequentially connected.
Preferably, a hydrogen-rich reformer is arranged on an upstream pipeline of the gas heat exchanger.
Preferably, the gas injection system comprises a gas trunk and a furnace body gas ring pipe which are communicated, a blind valve, a flow orifice plate, a regulating valve and a quick-cutting valve are sequentially arranged on the gas trunk along the gas flowing direction, a plurality of gas branch pipes are arranged on the furnace body gas ring pipe, spray guns are arranged at the tail ends of the gas branch pipes, the spray guns are located at the air port of the blast furnace, and stop valves, gas check valves and ball valves are arranged on the gas branch pipes.
Preferably, the number of the gas trunk is two, one of the gas trunk is used mainly, the other one is used for standby, and a safety valve is arranged on the gas trunk.
Preferably, the gasification agent injection system comprises a hot blast stove and a mixer which are connected together, and high-temperature hot air generated by the hot blast stove is fully mixed with oxygen and water vapor in the mixer and enters the high-temperature stove from the high-temperature gasification agent inlet to participate in the gasification of the coke breeze.
Preferably, the pneumatic conveying system comprises a coke breeze hopper, a high-temperature-resistant expansion joint, a high-temperature-resistant water-cooling material retaining valve and a high-temperature-resistant water-cooling dome valve which are sequentially connected from top to bottom;
the lower part of the high-temperature-resistant water-cooling material blocking valve is connected with a gas locking tank, and the gas locking tank and the blowing tank are separated by two high-temperature-resistant water-cooling dome valves; the lower side of the blowing tank is connected with a high-temperature-resistant pneumatic spiral feeding device;
the lower part of the high-temperature resistant pneumatic spiral feeding device is connected with a wear-resistant high-temperature resistant conveying pipeline, and the materials are injected into the high-temperature furnace by using coal gas.
Preferably, a bleeding valve is arranged on the furnace body gas ring pipe.
The working process of the system for preparing the hydrogen-rich gas and injecting the hydrogen-rich gas into the blast furnace comprises the following steps of:
s1, adding fine coal powder into the medium-temperature furnace from the coal powder inlet, further pyrolyzing the coal powder in the medium-temperature furnace by using high-temperature coal gas generated by gasification of the high-temperature furnace, wherein the temperature of raw coke oven gas at the outlet of the medium-temperature furnace is 950-1050 ℃;
s2, enabling the raw gas and the powdered coke to enter a gas-solid separation device together, enabling the raw gas to enter a hydrogen-rich reformer and a heat exchanger after gas-solid separation, enabling the temperature of the raw gas to be reduced to 600-700 ℃ after heat exchange and temperature reduction, enabling the raw gas to enter a waste heat boiler, enabling the gas outlet temperature of the waste heat boiler to be 150-200 ℃, enabling the gas to enter a dust removal device for purification, and generating clean hydrogen-rich gas, wherein the concentration of hydrogen-rich gas particles is 10mg/m3The concentration of the hydrogen-rich gas particles is 10mg/m3The heat value of the hydrogen-rich gas is 1200-1500 kcal/Nm3(ii) a The hydrogen-rich gas comprises the following components: CO is 30 to 35 percent; h210-30%, and can be adjusted according to the content of water vapor and oxygen in the high-temperature gasifying agent;
s3, conveying the clean hydrogen-rich gas in two paths, wherein one path is pressurized by a secondary gas pressurizer, and is injected into the blast furnace by a gas injection system to participate in smelting after being heated by heat exchange; the other path of the gas enters a pneumatic conveying system through the pressurization of a primary gas pressurizer, the pneumatic conveying system uses gas as a conveying medium, and high-temperature coke breeze separated from the bottom of the gas-solid separation device is carried and sprayed into a high-temperature furnace through a coke breeze inlet; meanwhile, high-temperature hot air generated by the hot blast stove is fully mixed with oxygen and steam in the mixer, and enters the high-temperature furnace from the high-temperature gasifying agent inlet to participate in the gasification of the coke breeze;
and S4, feeding high-temperature coal gas generated by high-temperature gasification of the coke breeze into the medium-temperature furnace from the bottom to participate in pyrolysis of the coal dust, wherein the gas flow velocity in the medium-temperature furnace is 5m/S, and the retention time is 5S.
Compared with the prior art, the invention has the beneficial technical effects that:
(1) the invention uses coal gas as a conveying medium to carry high-temperature coke breeze into the high-temperature furnace, is a high-temperature material conveying method, realizes hot charging and hot conveying, reduces heat loss, and simultaneously uses coal gas to replace nitrogen or air to enter the high-temperature furnace, thereby improving the heat value of hydrogen-rich coal gas generated by gasification;
(2) the purified hydrogen-rich gas is pressurized by a secondary gas pressurizer, heated by a gas heat exchanger and then sprayed to the blast furnace, so that the temperature of the gas is increased, and the phenomenon that the temperature of the gas needs to be raised for endothermic reaction after the gas enters the blast furnace is reduced; albeit H2O+C＝H2The CO is an endothermic reaction, but the high-temperature coal gas of the whole gasification furnace needs to be cooled, and the reaction for generating the hydrogen can be considered as the preliminary cooling of the coal gas, so that the hydrogen-rich modification can not cause obvious additional energy consumption from the whole system;
(3) the content of oxygen and water vapor in the high-temperature gasifying agent is adjusted by a gasifying agent injection system, so that H in the coal gas can be increased2The content can also play a role in adjusting the temperature of the coal gas;
(4) the coal gas heat exchanger and the waste heat boiler effectively utilize sensible heat of coal gas, and simultaneously, water vapor generated by the waste heat boiler is an important gasification agent raw material for hydrogen enrichment of the coal gas;
the preparation process can obtain the hydrogen-rich gas with high heat value, has good coal adaptability and high carbon conversion rate, effectively improves the utilization rate of coal energy, and safely injects the hydrogen-rich gas into the blast furnace for reduction smelting so as to improve the H content in the reducing atmosphere of the blast furnace2The proportion can improve the reduction reaction speed in the furnace, reduce the direct reduction reaction of carbon, reduce the coke consumption and reduce the smelting cost; meanwhile, hydrogen-rich gas is used for replacing part of coal powder, so that the carbon amount entering the furnace can be reduced, and the carbon content can be greatly reducedThe emission of carbon dioxide of the blast furnace is reduced, and the aim of reducing carbon and emission of the blast furnace is fulfilled.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a schematic structural diagram of a system for preparing hydrogen-rich gas and injecting the hydrogen-rich gas into a blast furnace according to the present invention;
FIG. 2 is a schematic structural diagram of a pneumatic conveying system according to the present invention;
FIG. 3 is a schematic structural view of a gas injection system of the present invention;
FIG. 4 is a schematic view of the arrangement of the gas branch pipes and the periphery of the blast furnace according to the present invention.
Description of reference numerals: 1. a high temperature furnace; 2. a high-temperature gasifying agent inlet; 3. an ignition device; 4. a pulverized coal inlet; 5. a medium temperature furnace; 6. a gas-solid separation device; 7. a hydrogen-rich reformer; 8. a gas heat exchanger; 9. a waste heat boiler; 10. a dust removal device; 11. a first-stage gas pressurizer; 12. a secondary gas pressurizer; 13. a hot blast stove; 14. a blast furnace; 15. a pneumatic conveying device; 16. a mixer; 17. a coke breeze inlet; 18. a blind plate valve; 19. a flow orifice plate; 20. adjusting a valve; 21. a quick-cut valve; 22. a safety valve; 23. a furnace body gas ring pipe; 24. a gas branch pipe; 25. a stop valve; 26. a gas check valve; 27. a ball valve; 28. a spray gun; 29. a bleed valve; 30. a high-temperature resistant water-cooling material blocking valve; 31. locking the air tank; 32. a high temperature resistant water cooled dome valve; 33. a blowing tank; 34. a high-temperature resistant pneumatic screw feeding device; 35. a high temperature resistant expansion joint; 36. wear-resistant and high-temperature-resistant conveying pipeline.
Detailed Description
It should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred 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.
In order that those skilled in the art will better understand the technical solutions of the present invention, the following detailed description of the preferred embodiments is provided in conjunction with the accompanying drawings.
As shown in figure 1, the embodiment of the invention discloses a system for preparing hydrogen-rich gas and injecting the hydrogen-rich gas into a blast furnace, which comprises two sections of furnaces, wherein the top of the high-temperature side of each section of furnace is provided with an ignition device 3, and the side wall of each section of furnace is sequentially provided with a coke breeze inlet 17 and a high-temperature gasifying agent inlet 2 from top to bottom. The high-temperature gasifying agent inlet 2 is connected with a gasifying agent injection system.
The side wall of the low-temperature side of the two sections of furnaces is provided with a pulverized coal inlet 4, the top of the low-temperature side of the two sections of furnaces is connected with an inlet of a gas-solid separation device 6, a gas outlet at the upper part of the gas-solid separation device 6 is sequentially connected with a gas heat exchanger 8, a waste heat boiler 9, a dust removal device 10 and a primary gas pressurizer 11, and a solid outlet at the lower part of the gas-solid separation device 6 is connected with a pneumatic conveying system.
Specifically, the inlet end of the waste heat boiler 9 is connected with the outlet of the gas heat exchanger 8, the gas outlet end of the waste heat boiler 9 enters the dust removing device 10, and the powder coke hopper at the bottom of the waste heat boiler 10 is connected to the pneumatic conveying system 15.
Specifically, the outlet of the dust removing device 10 is divided into two paths, wherein one path is communicated with the inlet of the secondary gas pressurizer 12, the outlet of the secondary gas pressurizer 12 is communicated with the gas heat exchanger 8, and the gas heat exchanger 8 is connected with the blast furnace 14 through a gas injection system; the other path of the outlet of the dust removing device 10 is connected with the inlet of a primary gas pressurizing machine 11, the outlet of the primary gas pressurizing machine 11 is connected with the inlet end of a pneumatic conveying system 15, and the pneumatic conveying system 1The outlet end of the 5 is connected with the powdered coke inlet 17; and the high-temperature gasifying agent inlet 2 is connected with a gasifying agent injection system. Through the design of the secondary gas pressurizer, the purified hydrogen-rich gas is pressurized, then is heated through the gas heat exchanger and then is sprayed to the blast furnace, so that the gas temperature is increased, and the phenomenon that the temperature of the gas needs to be raised for endothermic reaction after the gas enters the blast furnace is reduced; albeit H2O+C＝H2The CO is an endothermic reaction, but the high-temperature coal gas of the whole gasification furnace needs to be cooled, and the reaction for generating the hydrogen can be considered as the primary cooling of the coal gas, so that the hydrogen-rich modification does not cause obvious additional energy consumption from the whole system.
In order to preferably increase the hydrogen content in the gas, a hydrogen-rich reformer 7 is arranged in the pipeline upstream of the gas heat exchanger 8.
The coal powder inlet 4 is connected with a coal powder preparation system, the coal powder preparation system comprises a raw coal bin, a crusher, a crushed coal bin, a coal mill, a coarse coal separator and a coal powder feeder which are sequentially connected, and the coal powder feeder is finally connected with the coal powder inlet 4.
As a possible implementation, in the present embodiment, the gas-solid separation device 6 is a cyclone. The dust removing device 10 is a bag type dust remover.
As a possible implementation manner, in this embodiment, the two-stage furnace includes a medium-temperature furnace 5 with one side for coal powder pyrolysis and a high-temperature furnace 1 with the other side for coke breeze gasification, and bottoms of the high-temperature furnace 1 and the medium-temperature furnace 5 are communicated to form a U-shaped communication structure.
In the present embodiment, the gasifying agent injection system includes a hot blast stove 13 and a mixer 16 connected together, and the high-temperature hot air generated by the hot blast stove 13 is fully mixed with the oxygen and the water vapor in the mixer 16 and enters the high-temperature furnace 1 from the high-temperature gasifying agent inlet 2 to participate in the gasification of the coke breeze.
As shown in fig. 2, in this embodiment, the conveying material coke powder in the pneumatic conveying system 15 enters from the bottom ash hopper on the gas-solid separation device 6, and is sequentially connected with the coke powder ash hopper, the high temperature resistant expansion joint 35, and the high temperature resistant water-cooled material stop valve 30 (weighing and metering) from top to bottom; the lower part of the high-temperature resistant water-cooling material stop valve 30 is connected with an air locking tank 31, and the air locking tank 31 and the blowing tank 33 are separated by two high-temperature resistant water-cooling dome valves 32; the lower side of the injection tank 33 is connected with a high-temperature resistant pneumatic spiral feeding device 34 (the feeding amount is stably and accurately controlled); the lower part of the spiral feeding device is connected with a wear-resistant and high-temperature-resistant conveying pipeline 36, and the materials are sprayed into the high-temperature furnace 1 by using coal gas. The high temperature resistant pneumatic screw feeder 34 may be a water cooled screw feeder.
The inlet end of the waste heat boiler 9 is connected with the outlet of the gas heat exchanger 8, a metal expansion compensator is needed to be arranged due to the high temperature of the inlet end, the gas outlet end of the waste heat boiler enters the dust removing device 10, the powdered coke hopper at the bottom of the waste heat boiler is connected with a high-temperature-resistant and wear-resistant conveying pipeline 36 in the pneumatic conveying system 15, and the powdered coke is sprayed into the high-temperature furnace 1 from the powdered coke inlet 17 by utilizing the gas pressure generated by the primary gas pressurizer 11.
One path of outlet of the first-stage gas pressurizer 11 is connected with a high-temperature-resistant and wear-resistant conveying pipeline 36 in the pneumatic conveying system 15, the gas is pressurized to 70-100 kpa and then enters the injection system to convey high-temperature coke breeze, the tail end of the high-temperature-resistant and wear-resistant conveying pipeline 36 is divided into 2 paths of branch pipes in advance through an injection pipeline and a one-to-two distributor (in the vertical direction), the 2 paths of branch pipes are divided into 8 paths of branch pipes through one-to-four distributors respectively, and high-temperature coke powder is uniformly injected into the high-temperature furnace 1 from a coke breeze inlet 17 in two layers (4 branch pipes on one layer).
As a possible implementation manner, in the present embodiment, as shown in fig. 3, the gas injection system includes a gas trunk and a furnace body gas ring 23 that are communicated, a blind valve 18, a flow orifice plate 19, a regulating valve 20 and a fast-cutting valve 21 are sequentially arranged on the gas trunk in a gas flowing direction, and a plurality of gas branch pipes 24 are arranged on the furnace body gas ring 23. The gas branch pipe 24 is provided with a stop valve 25, a gas check valve 26 and a ball valve 27 to prevent the blast furnace gas from flowing backwards.
As shown in FIG. 4, the end of the gas branch pipe 24 is provided with a lance 28, and the lance 28 is located at the tuyere of the blast furnace 14. In order to ensure that the hydrogen-rich gas is uniformly distributed after entering the blast furnace 14, half of the tuyeres are designed for injecting the hydrogen-rich gas, the rest half of the tuyeres are still used for injecting the coal powder, and the tuyeres for injecting the hydrogen-rich gas and the tuyeres for injecting the coal powder are uniformly arranged in a crossed mode.
In order to ensure the safe operation of the gas injection system, two gas main lines are provided, wherein one gas main line is used as a main line, the other gas main line is used as a standby line, and a safety valve 22 and nitrogen emergency purging are arranged on the gas main lines. When normally overhauing or promptly blowing down, need sweep the jetting system, specific operation is: the safety valve 22 is opened, the quick-cut valve 21 and the stop valve 25 are closed, and the relief valve 29 is opened to purge the line.
The furnace body gas ring pipe 23 is provided with a bleeding valve 29 which is used for bleeding gas in emergency or for blowing and bleeding nitrogen, and the bleeding pipe is led to a furnace top bleeding platform. The furnace body gas ring pipe 23 is provided with a plurality of rows of stains for periodically cleaning impurities in the pipe and preventing blockage.
Based on the system structure diagram for preparing the hydrogen-rich gas and injecting the blast furnace in the figures 1 and 2, the embodiment of the invention also discloses a working process of the system for preparing the hydrogen-rich gas and injecting the blast furnace, which comprises the following steps:
s1, adding fine coal powder into the medium temperature furnace 5 through the coal powder inlet 4, further pyrolyzing the coal powder in the medium temperature furnace 5 by using high temperature coal gas generated by gasification of the high temperature furnace 1, wherein the temperature of raw coke oven gas at the outlet of the medium temperature furnace 5 is 950-1050 ℃, and the particle size distribution of the fine coal powder is 20-500 μm.
S2, the raw gas and the powdered coke enter a gas-solid separation device 6 together, after the gas-solid separation, the gas sequentially enters a hydrogen-rich reformer 7 and a heat exchanger 8, the temperature of the raw gas is reduced to 600-700 ℃ after heat exchange and temperature reduction, the raw gas enters a waste heat boiler 9, the gas outlet temperature of the waste heat boiler 9 is 150-200 ℃, and then the raw gas enters a dust removal device 10 for purification to generate clean hydrogen-rich gas, wherein the concentration of hydrogen-rich gas particles is 10mg/m3The concentration of the hydrogen-rich gas particles is 10mg/m3The heat value of the hydrogen-rich gas is 1200-1500 kcal/Nm3(ii) a The hydrogen-rich gas comprises the following components: CO is 30 to 35 percent; h210-30%, can be adjusted according to the steam and oxygen content in the high-temperature gasifying agent.
S3, conveying the clean hydrogen-rich gas in two paths, wherein one path of the clean hydrogen-rich gas is pressurized by the secondary gas pressurizer 12 and is injected into the blast furnace 14 by the gas injection system to participate in smelting, the pressure of the hydrogen-rich gas is 500-600 Kpa, and the temperature is raised to 600-700 ℃. The other path of the gas passes through a primary gas pressurizer 11, the hydrogen-rich gas enters a pneumatic conveying system 15, the pneumatic conveying system 15 uses the gas as a conveying medium, and high-temperature coke breeze separated from the bottom of the gas-solid separation device 6 is carried and sprayed into the high-temperature furnace 1 through a coke breeze inlet 17; meanwhile, high-temperature hot air generated by the hot blast stove 13 is fully mixed with oxygen and steam in the mixer 16, and enters the high-temperature furnace 1 from the high-temperature gasifying agent inlet 2 to participate in the gasification of the coke breeze.
S4, high-temperature coal gas generated by high-temperature gasification of the coke breeze enters the medium-temperature furnace 5 from the bottom to participate in the pyrolysis of the coal dust, the gas flow velocity in the medium-temperature furnace 5 is 5m/S, and the retention time is 5S.
In the present embodiment, the waste heat boiler 9 generates steam that can be sent to the mixer 16 through a steam pipe as a high-temperature gasifying agent component.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.

Claims (9)

1. A system for preparing hydrogen-rich gas and injecting the hydrogen-rich gas into a blast furnace is characterized in that: comprises two sections of furnaces, a high temperature furnace (1) and a medium temperature furnace (5); the top of the high-temperature side of the two-section furnace is provided with an ignition device (3), and the side wall is sequentially provided with a coke breeze inlet (17) and a high-temperature gasification agent inlet (2) from top to bottom;
a pulverized coal inlet (4) is formed in the side wall of the low-temperature side of the two sections of furnaces, the top of the low-temperature side of the two sections of furnaces is connected with an inlet of a gas-solid separation device (6), a gas outlet at the upper part of the gas-solid separation device (6) is sequentially connected with a gas heat exchanger (8), a waste heat boiler (9), a dust removal device (10) and a primary gas pressurizer (11), and a solid outlet at the lower part of the gas-solid separation device (6) is connected to a pneumatic conveying system (15);
the outlet of the dust removal device (10) is divided into two paths, wherein one path is communicated with the inlet of the secondary gas pressurizer (12), the outlet of the secondary gas pressurizer (12) is communicated with the gas heat exchanger (8), and the gas heat exchanger (8) is connected with a blast furnace (14) through a gas injection system; the other path of the outlet of the dust removal device (10) is connected with the inlet of a primary gas pressurizing machine (11), the outlet of the primary gas pressurizing machine (11) is connected with the inlet end of the pneumatic conveying system (15), and the outlet end of the pneumatic conveying system (15) is connected with the powdered coke inlet (17);
and the high-temperature gasifying agent inlet (2) is connected with a gasifying agent injection system.
2. The system for preparing hydrogen-rich gas and injecting in a blast furnace according to claim 1, wherein: the pulverized coal inlet (4) is connected with a pulverized coal preparation system, and the pulverized coal preparation system comprises a raw coal bunker, a crusher, a pulverized coal bunker, a coal mill, a coarse coal separator and a pulverized coal feeder which are sequentially connected.
3. The system for preparing hydrogen-rich gas and injecting in a blast furnace according to claim 1, wherein: and a hydrogen-rich modifier (7) is arranged on an upstream pipeline of the coal gas heat exchanger (8).
4. The system for preparing hydrogen-rich gas and injecting in a blast furnace according to claim 1, wherein: the coal gas injection system comprises a coal gas main line and a furnace body coal gas ring pipe (23) which are communicated, a blind valve (18), a flow pore plate (19), a regulating valve (20) and a quick-cutting valve (21) are sequentially arranged on the coal gas main line according to the gas flowing direction, a plurality of coal gas branch pipes (24) are arranged on the furnace body coal gas ring pipe (23), spray guns (28) are arranged at the tail ends of the coal gas branch pipes (24), the spray guns (28) are located at the air inlet of the blast furnace (14), and stop valves (25), coal gas check valves (26) and ball valves (27) are arranged on the coal gas branch pipes (24).
5. The system for preparing hydrogen-rich gas and injecting in a blast furnace according to claim 4, wherein: the coal gas main road is two, one is main, the other is standby, and a safety valve (22) is arranged on the coal gas main road.
6. The system for preparing hydrogen-rich gas and injecting in a blast furnace according to claim 1, wherein: the gasification agent injection system comprises a hot blast stove (13) and a mixer (16) which are connected together, and high-temperature hot air generated by the hot blast stove (13) is fully mixed with oxygen and water vapor in the mixer (16) and enters the high-temperature furnace (1) from the high-temperature gasification agent inlet (2) to participate in the gasification of the coke breeze.
7. The system for preparing hydrogen-rich gas and injecting in a blast furnace according to claim 1, wherein: the pneumatic conveying system (15) comprises a coke breeze hopper, a high-temperature-resistant expansion joint (35) and a high-temperature-resistant water-cooling material retaining valve (30) which are sequentially connected from top to bottom;
the lower part of the high-temperature-resistant water-cooling material blocking valve (30) is connected with a gas locking tank (31), and the gas locking tank (31) and the blowing tank (33) are separated by two high-temperature-resistant water-cooling dome valves (32); the lower side of the blowing tank (33) is connected with a high-temperature resistant pneumatic spiral feeding device (34);
the lower part of the high-temperature resistant pneumatic spiral feeding device (34) is connected with a wear-resistant high-temperature resistant conveying pipeline (36), and the materials are sprayed into the high-temperature furnace (1) by utilizing coal gas.
8. The system for preparing hydrogen-rich gas and injecting in a blast furnace according to claim 6, wherein: a diffusion valve (29) is arranged on the furnace body gas ring pipe (23).
9. The working process of the system for preparing the hydrogen-rich gas and injecting the hydrogen-rich gas into the blast furnace is characterized by comprising the following steps of:
s1, adding fine coal powder into a medium-temperature furnace (5) from a coal powder inlet (4), further pyrolyzing the coal powder in the medium-temperature furnace (5) by using high-temperature coal gas generated by gasification of a high-temperature furnace (1), wherein the temperature of raw coke oven gas at the outlet of the medium-temperature furnace (5) is 950-1050 ℃;
s2, the raw gas and the coke breeze enter a gas-solid separation device (6) together, after the raw gas is subjected to gas-solid separation,the gas sequentially enters a hydrogen-rich reformer (7) and a heat exchanger (8), the temperature of the raw coke oven gas is reduced to 600-700 ℃ after heat exchange and temperature reduction, then the raw coke oven gas enters a waste heat boiler (9), the gas outlet temperature of the waste heat boiler (9) is 150-200 ℃, and then the raw coke oven gas enters a dust removal device (10) for purification to generate clean hydrogen-rich gas, the concentration of particulate matters in the hydrogen-rich gas is 10mg/m3The heat value of the hydrogen-rich gas is 1200-1500 kcal/Nm3(ii) a The hydrogen-rich gas comprises the following components: CO is 30 to 35 percent; h210-30%, and can be adjusted according to the content of water vapor and oxygen in the high-temperature gasifying agent;
s3, conveying the clean hydrogen-rich gas in two paths, wherein one path is pressurized by a secondary gas pressurizer (12), and is injected into a blast furnace (14) by a gas injection system to participate in smelting after being heated by heat exchange; the other path of the gas enters a pneumatic conveying system (15) through the pressurization of a primary gas pressurizer (11), the pneumatic conveying system (15) uses gas as a conveying medium, and high-temperature coke breeze separated from the bottom of the gas-solid separation device (6) is carried and sprayed into the high-temperature furnace (1) through a coke breeze inlet (17); meanwhile, high-temperature hot air generated by the hot blast stove (13) is fully mixed with oxygen and steam in the mixer (16) and enters the high-temperature furnace (1) from the high-temperature gasifying agent inlet (2) to participate in the gasification of the coke breeze;
s4, high-temperature coal gas generated by high-temperature gasification of the coke breeze enters the medium-temperature furnace (5) from the bottom to participate in the pyrolysis of the coal dust, the gas flow velocity in the medium-temperature furnace (5) is 5m/S, and the retention time is 5S.
CN202110430896.7A 2021-04-21 2021-04-21 System and working process for preparing hydrogen-rich gas and applying hydrogen-rich gas to blast furnace injection Pending CN113005250A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114908201A (en) * 2022-04-19 2022-08-16 北京科技大学 Blast furnace hydrogen-rich solid fuel and hydrogen-rich gas fuel combined type injection device
CN115652008A (en) * 2022-09-23 2023-01-31 山东祥桓环境科技有限公司 High-temperature carbon-rich reforming system and process for smelting reducing gas
WO2023015924A1 (en) * 2021-08-12 2023-02-16 昌黎县兴国精密机件有限公司 Vehicle-mounted hydrogen supply method and device for hydrogen-rich smelting in blast furnace or shaft furnace

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023015924A1 (en) * 2021-08-12 2023-02-16 昌黎县兴国精密机件有限公司 Vehicle-mounted hydrogen supply method and device for hydrogen-rich smelting in blast furnace or shaft furnace
CN114908201A (en) * 2022-04-19 2022-08-16 北京科技大学 Blast furnace hydrogen-rich solid fuel and hydrogen-rich gas fuel combined type injection device
CN115652008A (en) * 2022-09-23 2023-01-31 山东祥桓环境科技有限公司 High-temperature carbon-rich reforming system and process for smelting reducing gas
CN115652008B (en) * 2022-09-23 2023-11-21 山东祥桓环境科技有限公司 High-temperature carbon-rich reforming system and process for smelting reducing gas

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