Hydro metallurgical supplementary heating method and device

Abstract

The present application relates to a kind of hydrogen metallurgy supplementary heating method and device, comprising:1) the biomass synthesis gas generated by biomass gasification furnace is stored in gas storage tank;2) biomass synthesis gas is pumped into heat exchanger by fan and is heated for the first time, and the first heating temperature is 80-200 ℃;3) the biomass synthesis gas after first heating is ignited by passing into burner and is heated for the second time, and the second heating temperature is 800-1300 ℃;4) after the biomass synthesis gas after second heating is mixed with the gas from secondary hydrogen metallurgical reactor, it is entered into primary hydrogen metallurgical reactor together, and the temperature of mixed gas entering into primary hydrogen metallurgical reactor is 700-900 ℃.The present application uses renewable resource biomass energy gasification biomass synthesis gas containing CO, H2, CH4, not only does not reduce the hydrogen content in original gas, but also increases a part of reducing gas CO, H2, and can also burn part of combustible gas to heat up, promote hydrogen metallurgical reactor reduction reaction more efficient.

Description

Technical Field

[0001] This invention relates to the field of hydrogen metallurgy technology, specifically to a method and apparatus for supplementary heating in hydrogen metallurgy. Background Technology

[0002] Hydrogen reduction of iron ore requires specific temperature conditions. The higher the reduction temperature, the faster the reduction rate and the higher the metallization rate. However, the reaction itself is endothermic, which causes the temperature in the reactor to drop, hindering the reaction. Additional heat is needed to maintain the direct reduction of iron ore by hydrogen. Typically, some hydrogen needs to be burned to release heat and supplement the heat. This not only produces waste gas but also removes a lot of heat, reducing the hydrogen concentration in the reaction vessel, which is detrimental to the hydrogen metallurgical reduction reaction and results in a low direct reduction iron metallization rate.

[0003] Meanwhile, the explosive limits of hydrogen in air are 4.0% to 75.6%, and the explosive limits in oxygen are 4.0% to 94%. Hydrogen combustion equipment and ignition requirements are relatively high, posing significant safety risks. Summary of the Invention

[0004] This invention provides a method and apparatus for supplementary heating in hydrogen metallurgy. It utilizes renewable biomass energy to gasify biomass syngas containing CO, H2, and CH4. This not only does not reduce the hydrogen content in the original gas, but also increases the amount of reducing gases CO and H2, and can also burn some combustible gases to raise the temperature, thereby reaching the temperature required for the direct reduction of iron ore by hydrogen, and promoting a more efficient reduction reaction in the hydrogen metallurgy reactor.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] A method for supplementary heating in hydrogen metallurgy includes the following steps:

[0007] 1) First, store the biomass syngas produced by the biomass gasifier in a gas storage tank.

[0008] 2) The biomass syngas in the storage tank is blown into the heat exchanger by a fan for a primary heating, and the primary heating temperature of the biomass syngas is 80-200℃.

[0009] 3) The biomass syngas, after being heated once, is ignited in a burner for a second heating. The second heating temperature of the biomass syngas is 800-1300℃.

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

[0011] The biomass used in the biomass gasification furnace includes rice husks, corn chips, and sawdust.

[0012] In step 4), the pressure of the biomass syngas 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 a single heat exchange and temperature increase on biomass syngas. The temperature of the waste heat resources is 80–300°C.

[0014] An apparatus for a hydrogen metallurgical supplementary heating method includes a biomass gasifier, a gas storage tank, a blower, a heat exchanger, a burner, a pipeline for the reducing gas from the secondary hydrogen metallurgical reactor to enter the 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 connected in sequence to the blower, the heat exchanger, and the burner via pipelines. The output pipeline of the burner is connected to the pipeline for the reducing gas from the secondary hydrogen metallurgical reactor to enter the primary hydrogen metallurgical reactor.

[0015] A pressure detector is installed on the pipe 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 beneficial effects of the present invention are:

[0018] This invention provides a low-carbon heating technology. Compared with supplementing heat by burning a portion of hydrogen to release heat, the amount of hydrogen is not reduced, but a portion of reducing gas is added. It can also burn part of the temperature to reach the temperature required for direct hydrogen reduction of iron ore. Compared with existing technologies, this technology is beneficial to hydrogen metallurgical reduction reaction and improves the direct reduction iron metallization rate. Attached Figure Description

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

[0020] In the diagram: 1-Biomass gasifier; 2-Gas storage tank; 3-Fan; 4-Heat exchanger; 5-Pressure detector; 6-Burner; 7-Pipeline for reducing gas from the secondary hydrogen metallurgical reactor to enter the primary hydrogen metallurgical reactor; 8-Primary hydrogen metallurgical reactor; 9-Temperature detector. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the specific implementation methods of this invention will be further described below in conjunction with the embodiments. The following embodiments are used to specifically illustrate the content of this invention. These embodiments are only general descriptions of the content of this invention and do not limit the content of this invention.

[0022] like Figure 1 As shown, an apparatus for a hydrogen metallurgical supplementary heating method includes a biomass gasifier 1, a gas storage tank 2, a blower 3, a heat exchanger 4, a burner 6, a pipeline 7 through which the reducing gas from the secondary hydrogen metallurgical reactor enters the primary hydrogen metallurgical reactor, and a primary hydrogen metallurgical reactor 8. The biomass gasifier 1 is connected to the gas storage tank 2 via a pipeline. The gas storage tank 2 is connected in sequence to the blower 3, the heat exchanger 4, and the burner 6 via pipelines. The output pipeline of the burner 6 is connected to the pipeline 7 through which the reducing gas from the secondary hydrogen metallurgical reactor enters the primary hydrogen metallurgical reactor.

[0023] A pressure detector 5 is installed on the pipe 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 method for supplementary heating in hydrogen metallurgy includes the following steps:

[0026] 1) First, store the biomass syngas produced by biomass gasifier 1 in gas storage tank 2.

[0027] 2) The biomass syngas in the gas storage tank 2 is blown into the heat exchanger 4 by the blower 3 for a primary heating. The primary heating temperature of the biomass syngas is 80-200℃.

[0028] 3) The biomass syngas that has been heated once is introduced into burner 6 and ignited for a second heating. The second heating temperature of the biomass syngas is 800-1300℃.

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

[0030] The biomass used in the biomass gasification furnace 1 includes rice husks, corn chips, and sawdust.

[0031] In step 4), the pressure of the biomass syngas 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 each production unit to perform a primary heat exchange and temperature increase on the biomass syngas. The temperature of the waste heat resources is 80–300°C.

[0033] The burner 6 regulates the combustion temperature by controlling the opening of the valve after operating the gas storage tank 2 to control the gas entering the burner 6 and the opening of the burner 6 damper. The heating temperature range of the burner 6 is 300 to 1200℃.

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

[0035] Temperature detector 9 is located on the inlet pipe of the primary hydrogen metallurgical reactor 8, close to the primary hydrogen metallurgical reactor 8. It detects the temperature of the gas after the biomass gas is mixed. The combustion temperature can be adjusted by controlling the opening of the valve after the gas storage tank 2 to control the gas entering the burner 6 and the opening of the burner 6 damper, 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℃~900℃.

[0036] Example 1:

[0037] A method for supplementary heating in hydrogen metallurgy includes the following steps:

[0038] 1) First, store the biomass syngas produced by biomass gasifier 1 in gas storage tank 2;

[0039] 2) The biomass syngas in the gas storage tank 2 is blown into the heat exchanger 4 by the blower 3 for a primary heating. The primary heating temperature of the biomass syngas is 120℃.

[0040] Heat exchanger 4 is composed of one or more heat exchangers connected in series. It uses the flue gas from the coke oven at a temperature of 248°C to perform a single heat exchange to raise the temperature of the biomass syngas.

[0041] 3) The biomass syngas that has been heated once is passed into burner 6 and ignited for a second heating. The second heating temperature of the biomass syngas is 1000℃.

[0042] 4) The biomass syngas after secondary heating is mixed with the gas flowing out of the secondary hydrogen metallurgical reactor and then enters the primary hydrogen metallurgical reactor 8. The pressure of the biomass syngas after secondary heating is 500 Pa 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℃.

[0043] The biomass used in biomass gasification furnace 1 is rice husk, corn husk and sawdust.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions 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 method for supplementary heating in hydrogen metallurgy, characterized in that, The methods and steps include the following: 1) First, store the biomass syngas produced by the biomass gasifier in a gas storage tank; 2) The biomass syngas in the storage tank is blown into the heat exchanger by a blower for primary heating. The primary heating temperature of the biomass syngas is 80-200℃. 3) The biomass syngas that has undergone one heating is passed into the burner and ignited for a second heating. The second heating temperature of the biomass syngas is 800-1300℃. 4) The biomass syngas after secondary heating is mixed with the gas flowing out of the secondary hydrogen metallurgical reactor and then enters the primary hydrogen metallurgical reactor together. The temperature of the mixed gas entering the primary hydrogen metallurgical reactor is 700-900℃.

2. The hydrogen metallurgical supplementary heating method according to claim 1, characterized in that, The biomass used in the biomass gasification furnace includes rice husks, corn chips, and sawdust.

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

4. The 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 a single heat exchange and temperature increase on biomass syngas. The temperature of the waste heat resources is 80–300°C.

5. An apparatus used in the hydrogen metallurgical supplementary heating method as described in any one of claims 1-4, characterized in that, The system includes a biomass gasifier, a gas storage tank, a blower, a heat exchanger, a burner, a pipeline for the reducing gas from 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 via a pipeline. The gas storage tank is connected in sequence to the blower, heat exchanger, and burner via pipelines. The output pipeline of the burner is connected to the pipeline for the reducing gas from the secondary hydrogen metallurgical reactor to enter the primary hydrogen metallurgical reactor.

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

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

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