Hydrogen metallurgy supplementary heating method and device

Abstract

The invention relates to a hydrogen metallurgy supplementary heating method and device. The method comprises the following steps: 1) storing biomass synthesis gas generated by a biomass gasifier in a gas storage tank; 2) blowing the biomass synthesis gas into a heat exchanger through a fan for primary heating, wherein the primary heating temperature is 80-200 DEG C; (3) introducing the biomass synthesis gas subjected to primary heating into a combustor, igniting, and carrying out secondary heating, wherein the temperature of the secondary heating is 800-1300 DEG C; and (4) mixing the biomass synthesis gas subjected to secondary heating with gas flowing out of the secondary hydrogen metallurgy reactor, feeding the mixture into a primary hydrogen metallurgy reactor, and controlling the temperature of the mixed gas entering the primary hydrogen metallurgy reactor to be 700-900 DEG C. According to the invention, biomass synthesis gas containing CO, H2 and CH4 is gasified by utilizing renewable resource biomass energy, so that the hydrogen content in the original gas is not reduced, a part of reducing gas CO and H2 is added, a part of combustible gas can be combusted for heating, and the reduction reaction of the hydrogen metallurgy reactor is promoted to be carried out more efficiently.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen metallurgy, and in particular to a hydrogen metallurgy supplementary heating method and device. Background Art

[0002] Hydrogen reduction of iron ore requires certain temperature conditions. The higher the reduction temperature, the faster the reduction rate and the higher the metallization rate. However, the reaction itself is an endothermic reaction, which causes the temperature in the reactor to become lower and lower, which is not conducive to the reaction. Additional heat is required to maintain direct hydrogen reduction of iron ore. Usually, a part of the hydrogen needs to be burned to supplement the heat through combustion heat release. This not only produces waste gas but also takes away a lot of heat, and also causes the hydrogen concentration in the reaction vessel to decrease, which is not conducive to hydrogen metallurgical reduction reaction and the direct reduction iron metallization rate is not high.

[0003] At the same time, the explosion limit of hydrogen in air is 4.0% to 75.6%, and the explosion limit in oxygen is 4.0% to 94%. The requirements for hydrogen combustion equipment and ignition are high, and there are great safety risks. Summary of the invention

[0004] The present invention provides a hydrogen metallurgical supplementary heating method and device, which utilizes renewable resource biomass energy to gasify biomass synthesis gas containing CO, H2, and CH4, not only does it not reduce the hydrogen content in the original gas, but also increases a portion of reducing gas CO and H2, and can also burn part of the combustible gas to increase the temperature, thereby reaching the temperature required for direct reduction of iron ore by hydrogen, and promoting more efficient reduction reaction in the hydrogen metallurgical reactor.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A hydrogen metallurgical supplementary heating method, comprising the following method steps:

[0007] 1) First, the biomass synthesis gas produced by the biomass gasification furnace is stored in a gas storage tank.

[0008] 2) The biomass synthesis gas in the gas storage tank is blown into the heat exchanger through a fan for primary heating, and the primary heating temperature of the biomass synthesis gas is 80-200°C.

[0009] 3) The biomass synthesis gas that has been heated once is passed into a burner and ignited for secondary heating. The secondary heating temperature of the biomass synthesis gas is 800-1300°C.

[0010] 4) The biomass synthesis gas after the second heating is mixed with the gas flowing out of the secondary hydrogen metallurgical reactor and enters the primary hydrogen metallurgical reactor together. The temperature of the mixed gas entering the primary hydrogen metallurgical reactor is 700-900°C.

[0011] The biomass used in the biomass gasifier includes rice husks, corn chips, and wood chips.

[0012] In the step 4), the pressure of the biomass synthesis gas after the second heating is 300-1000 Pa greater than the pressure of the gas flowing out of the secondary hydrogen metallurgical reactor.

[0013] The heat exchanger utilizes the existing medium and low temperature waste heat resources of production units at all levels to perform heat exchange and temperature raising on the biomass synthesis gas, and the waste heat resource temperature is 80-300°C.

[0014] A device used in a hydrogen metallurgical supplementary heating method comprises a biomass gasifier, a gas storage tank, a fan, a heat exchanger, a burner, a pipeline for reducing gas after a secondary hydrogen metallurgical reactor to enter a primary hydrogen metallurgical reactor, and a primary hydrogen metallurgical reactor. The biomass gasifier is connected to the gas storage tank via a pipeline, and the gas storage tank is sequentially connected to the fan, the heat exchanger and the burner via pipelines. The output pipeline of the burner is connected to the pipeline for reducing gas after the secondary hydrogen metallurgical reactor to enter the primary hydrogen metallurgical reactor.

[0015] A pressure detector is installed on the pipeline connecting the heat exchanger and the burner.

[0016] A temperature detector is installed on the inlet pipe of the primary hydrogen metallurgical reactor.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention provides a low-carbon heating technology. Compared with supplementing heat by burning a part of hydrogen to release heat, the amount of hydrogen will not be reduced, and a part of reducing gas will be added. It can also burn part of the temperature to reach the temperature required for direct reduction of iron ore by hydrogen. Compared with the existing technology, it is beneficial to hydrogen metallurgical reduction reaction and improves the metallization rate of direct reduced iron. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a simplified structural diagram of the device of the present invention.

[0020] In the figure: 1-Biomass gasifier 2-Gas storage tank 3-Blower 4-Heat exchanger 5-Pressure detector 6-Burner 7-Pipeline for the reducing gas after the secondary hydrogen metallurgical reactor to enter the primary hydrogen metallurgical reactor 8-Primary hydrogen metallurgical reactor 9-Temperature detector. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the specific implementation methods of the present invention are further described below in conjunction with embodiments. The following embodiments are used to specifically illustrate the contents of the present invention. These embodiments are only general descriptions of the contents of the present invention and do not limit the contents of the present invention.

[0022] like Figure 1 As shown, a device used in a hydrogen metallurgical supplementary heating method includes a biomass gasifier 1, a gas storage tank 2, a fan 3, a heat exchanger 4, a burner 6, a pipeline 7 for reducing gas after the secondary hydrogen metallurgical reactor to enter the primary hydrogen metallurgical reactor, and a primary hydrogen metallurgical reactor 8. The biomass gasifier 1 is connected to the gas storage tank 2 through a pipeline, and the gas storage tank 2 is sequentially connected to the fan 3, the heat exchanger 4 and the burner 6 through a pipeline, and the output pipeline of the burner 6 is connected to the pipeline 7 for reducing gas after the secondary hydrogen metallurgical reactor to enter the primary hydrogen metallurgical reactor.

[0023] A pressure detector 5 is installed on the pipeline connecting the heat exchanger 4 and the burner 6 .

[0024] A temperature detector 9 is installed on the inlet pipe of the primary hydrogen metallurgical reactor 8 .

[0025] A hydrogen metallurgical supplementary heating method, comprising the following method steps:

[0026] 1) First, the biomass synthesis gas generated by the biomass gasification furnace 1 is stored in the gas storage tank 2.

[0027] 2) The biomass synthesis gas in the gas storage tank 2 is blown into the heat exchanger 4 through the fan 3 for primary heating, and the primary heating temperature of the biomass synthesis gas is 80-200°C.

[0028] 3) The biomass synthesis gas that has been heated once is introduced into the burner 6 and ignited for secondary heating. The secondary heating temperature of the biomass synthesis gas is 800-1300°C.

[0029] 4) The biomass synthesis gas after the second heating is mixed with the gas flowing out of the secondary hydrogen metallurgical reactor and enters the primary hydrogen metallurgical reactor 8 together. The temperature of the mixed gas entering the primary hydrogen metallurgical reactor 8 is 700-900°C.

[0030] The biomass used in the biomass gasifier 1 includes rice husks, corn chips, and wood chips.

[0031] In the step 4), the pressure of the biomass synthesis gas after the second heating is 300-1000 Pa greater than the pressure of the gas flowing out of the secondary hydrogen metallurgical reactor.

[0032] The heat exchanger 4 utilizes the existing medium and low temperature waste heat resources of production units at all levels to perform heat exchange and temperature raising on the biomass synthesis gas, and the waste heat resource temperature is 80-300°C.

[0033] The burner 6 controls the gas entering the burner 6 and the air door opening of the burner 6 by operating the valve opening of the gas storage tank 2 to adjust the combustion temperature. The heating temperature range of the burner 6 can be 300-1200°C.

[0034] The pressure detector 5 is located between the heat exchanger 4 and the burner 6, and is used to detect the biomass gas pressure. It can be adjusted by controlling the speed of the fan 3 and the corresponding valve opening to ensure that the biomass gas pressure is slightly greater than the gas pressure of the gas pipeline flowing out of the secondary hydrogen metallurgical reactor and entering the primary hydrogen metallurgical reactor by 300 to 1000 Pa.

[0035] The temperature detector 9 is located on the inlet pipe entering the primary hydrogen metallurgical reactor 8, close to the side of the primary hydrogen metallurgical reactor 8, and detects the gas temperature after the biomass gas is mixed. The combustion temperature can be adjusted by operating the valve opening after the gas storage tank 2 to control the gas entering the burner 6 and the air door opening of the burner 6, or by combining the adjustment through the heat exchanger 4, so that the temperature of the mixed gas entering the primary hydrogen metallurgical reactor 8 after combustion reaches the required temperature of 700°C to 900°C.

[0036] Embodiment 1:

[0037] A hydrogen metallurgical supplementary heating method, comprising the following method steps:

[0038] 1) First, the biomass synthesis gas generated by the biomass gasification furnace 1 is stored in the gas storage tank 2;

[0039] 2) The biomass synthesis gas in the gas storage tank 2 is blown into the heat exchanger 4 through the fan 3 for primary heating, and the primary heating temperature of the biomass synthesis gas is 120°C;

[0040] The heat exchanger 4 is composed of one or more sets of heat exchangers connected in series, and utilizes the flue gas discharged from the coke oven with a temperature of 248° C. to perform a heat exchange and temperature increase on the biomass synthesis gas.

[0041] 3) The biomass synthesis gas that has been heated once is passed into the burner 6 and ignited for secondary heating. The secondary heating temperature of the biomass synthesis gas is 1000° C.;

[0042] 4) The biomass synthesis gas after the second heating is mixed with the gas flowing out of the secondary hydrogen metallurgical reactor and enters the primary hydrogen metallurgical reactor 8 together. The pressure of the biomass synthesis gas after the second heating is 500Pa greater than the pressure of the gas flowing out of the secondary hydrogen metallurgical reactor, and the temperature of the mixed gas entering the primary hydrogen metallurgical reactor 8 is 900°C.

[0043] The biomass used in the biomass gasifier 1 is rice husk, corn chips and wood chips.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydrogen metallurgical supplementary heating method, characterized in that: The method comprises the following steps: 1) First, the biomass synthesis gas produced by the biomass gasification furnace is stored in a gas storage tank; 2) The biomass synthesis gas in the gas storage tank is blown into the heat exchanger through a fan for primary heating, and the primary heating temperature of the biomass synthesis gas is 80-200°C; 3) The biomass synthesis gas that has been heated once is passed into a burner and ignited for secondary heating, and the secondary heating temperature of the biomass synthesis gas is 800-1300°C; 4) The biomass synthesis gas after the second heating is mixed with the gas flowing out of the secondary hydrogen metallurgical reactor and enters the primary hydrogen metallurgical reactor together. The temperature of the mixed gas entering the primary hydrogen metallurgical reactor is 700-900°C.

2. A hydrogen metallurgical supplementary heating method according to claim 1, characterized in that: The biomass used in the biomass gasifier includes rice husks, corn chips, and wood chips.

3. A hydrogen metallurgical supplementary heating method according to claim 1, characterized in that: In the step 4), the pressure of the biomass synthesis gas after the second heating is 300-1000 Pa greater than the pressure of the gas flowing out of the secondary hydrogen metallurgical reactor.

4. A hydrogen metallurgical supplementary heating method according to claim 1, characterized in that: The heat exchanger utilizes the existing medium and low temperature waste heat resources of production units at all levels to perform heat exchange and temperature raising on the biomass synthesis gas, and the waste heat resource temperature is 80-300°C.

5. A device for the hydrogen metallurgical supplementary heating method according to any one of claims 1 to 4, characterized in that: It includes a biomass gasifier, a gas storage tank, a fan, a heat exchanger, a burner, a pipeline for the reducing gas after the secondary hydrogen metallurgical reactor to enter the primary hydrogen metallurgical reactor, and the primary hydrogen metallurgical reactor. The biomass gasifier is connected to the gas storage tank through a pipeline, and the gas storage tank is sequentially connected to the fan, the heat exchanger and the burner through pipelines. The output pipeline of the burner is connected to the pipeline for the reducing gas after the secondary hydrogen metallurgical reactor to enter the primary hydrogen metallurgical reactor.

6. The device used in the hydrogen metallurgical supplementary heating method according to claim 5 is characterized in that: A pressure detector is installed on the pipeline connecting the heat exchanger and the burner.

7. The device used in the hydrogen metallurgical supplementary heating method according to claim 5 is characterized in that: A temperature detector is installed on the inlet pipe of the primary hydrogen metallurgical reactor.

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