Hydrogen metallurgy supplementary heating device and using method thereof

Abstract

The invention relates to a hydrogen metallurgy supplementary heating device which comprises a heat exchanger, a microwave heating device and a pressure swing adsorption device, the pressure swing adsorption device is located on a gas communication pipeline between a secondary hydrogen metallurgy reactor and a primary hydrogen metallurgy reactor, and the heat exchanger is arranged between the pressure swing adsorption device and the primary hydrogen metallurgy reactor. A treated exhaust gas pipeline of the pressure swing adsorption device is connected with the microwave heating device, a treated product gas pipeline of the pressure swing adsorption device is connected with the heat exchanger, and an outlet pipeline of the microwave heating device is connected with the heat exchanger. The hydrogen is dehydrated and purified through the pressure swing adsorption device, and the part of byproduct water vapor is heated by microwave to heat the dehydrated and purified hydrogen, so that the dehydrated and purified hydrogen reaches the temperature required by direct reduction of iron ore, and the continuous and efficient reduction reaction of the hydrogen metallurgy reactor is promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen metallurgy, and in particular to a hydrogen metallurgy supplementary heating device and a use method thereof. 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 needed to maintain direct hydrogen reduction of iron ore. Heat is usually supplemented by burning a portion of the hydrogen to release heat. This not only causes the exhaust gas to take away a lot of heat, but also reduces the hydrogen concentration in the reaction vessel, which is not conducive to hydrogen metallurgical reduction reactions and the direct reduction of 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 device and a method for using the same. The hydrogen coming out of a secondary hydrogen metallurgical reactor contains a large amount of byproduct water vapor. The present invention dehydrates and purifies the hydrogen through a pressure swing adsorption device, and then uses microwave heating to heat the byproduct water vapor, which is used to heat the dehydrated and purified hydrogen to reach the temperature required for direct reduction of iron ore, thereby promoting the continuous and 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 device comprises a heat exchanger, a microwave heating device, and a pressure swing adsorption device. The pressure swing adsorption device is located on a gas communication pipeline between a secondary hydrogen metallurgical reactor and a primary hydrogen metallurgical reactor. The heat exchanger is arranged between the pressure swing adsorption device and the primary hydrogen metallurgical reactor. The exhaust gas pipeline after treatment by the pressure swing adsorption device is connected to the microwave heating device. The product gas pipeline after treatment by the pressure swing adsorption device is connected to the heat exchanger. The outlet pipeline of the microwave heating device is connected to the heat exchanger.

[0007] A temperature detector is installed on the hydrogen inlet pipeline of the primary hydrogen metallurgical reactor.

[0008] The temperature detector and the microwave heating device are connected to a controller.

[0009] A method for using a hydrogen metallurgical supplementary heating device, comprising:

[0010] 1) The hydrogen gas introduced into the primary hydrogen metallurgical reactor from the secondary hydrogen metallurgical reactor enters the pressure swing adsorption device, water vapor in the hydrogen gas is separated in the pressure swing adsorption device, and the pure hydrogen gas from which the water vapor is separated enters the heat exchanger;

[0011] 2) The water vapor separated from the pressure swing adsorption device enters the microwave heating device for heating, and the heated water vapor also enters the heat exchanger to exchange heat with pure hydrogen. The pure hydrogen after heat exchange is heated to 700-950°C and sent to the primary hydrogen metallurgical reactor.

[0012] The power of the microwave heating device is 3500-20000W, and the heating temperature ranges from 80-1500°C.

[0013] The adsorbent of the pressure swing adsorption device is activated alumina.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention discloses a hydrogen metallurgical supplementary heating device and a method for using the same. The hydrogen coming out of a secondary hydrogen metallurgical reactor contains a large amount of byproduct water vapor. The present invention uses a pressure swing adsorption device to dehydrate and purify the hydrogen, and then uses microwave heating to heat the byproduct water vapor, which is used to heat the dehydrated and purified hydrogen to reach the temperature required for directly reducing iron ore, thereby promoting the continuous and efficient reduction reaction in the hydrogen metallurgical reactor.

[0016] The present invention provides a low-carbon heating technology. Compared with supplementing heat by burning a portion of hydrogen to release heat, the amount of hydrogen in the present invention will not be reduced, and the hydrogen concentration will be greatly increased, thereby improving the efficiency of direct reduction of iron by hydrogen metallurgy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the device of the present invention.

[0018] In the figure: 1-primary hydrogen metallurgical reactor, 2-temperature detector, 3-heat exchanger, 4-controller, 5-microwave heating device, 6-product gas pipeline after treatment by pressure swing adsorption device, 7-exhaust gas pipeline after treatment by pressure swing adsorption device, 8-pressure swing adsorption device, 9-water supply pipeline, 10-water supply valve. DETAILED DESCRIPTION

[0019] 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.

[0020] like Figure 1As shown, a hydrogen metallurgical supplementary heating device includes a heat exchanger 3, a microwave heating device 5, and a pressure swing adsorption device 8. The pressure swing adsorption device 8 is located on the gas connecting pipeline between the secondary hydrogen metallurgical reactor and the primary hydrogen metallurgical reactor 1, and the heat exchanger 3 is arranged between the pressure swing adsorption device 8 and the primary hydrogen metallurgical reactor 1. The exhaust gas pipeline 7 after treatment by the pressure swing adsorption device is connected to the microwave heating device 5, the product gas pipeline 6 after treatment by the pressure swing adsorption device is connected to the heat exchanger 3, and the outlet pipeline of the microwave heating device is connected to the heat exchanger.

[0021] A temperature detector 2 is installed on the hydrogen inlet pipeline of the primary hydrogen metallurgical reactor 1 .

[0022] The temperature detector 2 and the microwave heating device 5 are connected to the controller 4 .

[0023] A method for using a hydrogen metallurgical supplementary heating device, comprising:

[0024] 1) The hydrogen gas introduced into the primary hydrogen metallurgical reactor 1 from the secondary hydrogen metallurgical reactor enters the pressure swing adsorption device 8, water vapor in the hydrogen gas is separated in the pressure swing adsorption device 8, and the pure hydrogen gas from which the water vapor is separated enters the heat exchanger 3;

[0025] 2) The water vapor separated from the pressure swing adsorption device 8 enters the microwave heating device 5 for heating, and the heated water vapor also enters the heat exchanger 3 to exchange heat with the pure hydrogen. The pure hydrogen after heat exchange is heated to 700-950°C and sent to the primary hydrogen metallurgical reactor 1. A water supply pipeline 9 is also provided to connect the microwave heating device 5. If the water vapor separated from the pressure swing adsorption device 8 is not enough to heat the pure hydrogen, water vapor can be supplemented to the microwave heating device 5 through the water supply pipeline 10. The water supply valve 10 is also connected to the controller 4.

[0026] The power of the microwave heating device 5 is 3500-20000W, and the heating temperature ranges from 80 to 1500°C.

[0027] The adsorbent of the pressure swing adsorption device 8 is activated alumina.

[0028] The pressure swing adsorption device 8 is located on the gas connecting pipeline between the secondary hydrogen metallurgical reactor and the primary hydrogen metallurgical reactor 1. The adsorbent is activated alumina, which purifies the reducing gas after hydrogen metallurgy in the secondary hydrogen metallurgical reactor, purifies the concentration of hydrogen, and removes moisture from the reducing gas.

[0029] The microwave heating device 5 is located on the exhaust gas pipeline 7 after treatment by the pressure swing adsorption device, between the pressure swing adsorption device 8 and the heat exchanger 3. The exhaust gas pipeline 7 after treatment by the pressure swing adsorption device is cast in an integral manner with refractory materials. The byproduct water vapor generated by the reduction of iron ore by hydrogen in the secondary hydrogen metallurgical reactor discharged from the pressure swing adsorption device 8 enters the microwave heating device 5 through the exhaust gas pipeline 7 after treatment by the pressure swing adsorption device for heating.

[0030] The product gas pipeline 6 after treatment by the pressure swing adsorption device is connected to the primary hydrogen metallurgical reactor 1, and the heat exchanger 3 is located on the product gas pipeline 6 after treatment by the pressure swing adsorption device, so as to realize the heat exchange between the exhaust gas (water vapor) after treatment by the pressure swing adsorption device 8 and the product gas (purified hydrogen) after treatment by the pressure swing adsorption device 8, and adopts indirect heat exchange, and the exhaust gas and the product gas flow in the opposite direction relative to each other.

[0031] The temperature detector 2 is located on the inlet pipe of the primary hydrogen removal metallurgical reactor 1 , between the heat exchanger 3 and the primary hydrogen removal metallurgical reactor 1 , and is used to detect the temperature of the gas after being heated by the microwave heating device 5 .

[0032] The controller 4 is responsible for receiving the temperature information measured by the temperature detector 2 and conveying the working instructions to the microwave heating device 5 according to the set program:

[0033] When the temperature detected by the temperature detector 2 in real time is ≤700°C, the controller 4 issues an instruction to gradually increase the power of the microwave heating device 5 until the temperature measured by the temperature detector 2 reaches 700-950°C.

[0034] When the temperature detected by the temperature detector 2 in real time is ≥950°C, the controller 4 issues an instruction to gradually reduce the power of the microwave heating device 5 until the temperature measured by the temperature detector 2 reaches 700-950°C.

Claims

1. A hydrogen metallurgical supplementary heating device, characterized in that: It includes a heat exchanger, a microwave heating device, and a pressure swing adsorption device. The pressure swing adsorption device is located on the gas connecting pipeline between the secondary hydrogen metallurgical reactor and the primary hydrogen metallurgical reactor. The heat exchanger is arranged between the pressure swing adsorption device and the primary hydrogen metallurgical reactor. The exhaust gas pipeline after treatment by the pressure swing adsorption device is connected to the microwave heating device. The product gas pipeline after treatment by the pressure swing adsorption device is connected to the heat exchanger. The outlet pipeline of the microwave heating device is connected to the heat exchanger.

2. A hydrogen metallurgical supplementary heating device according to claim 1, characterized in that: A temperature detector is installed on the hydrogen inlet pipeline of the primary hydrogen metallurgical reactor.

3. A hydrogen metallurgical supplementary heating device according to claim 2, characterized in that: The temperature detector and the microwave heating device are connected to a controller.

4. A method for using the hydrogen metallurgical supplementary heating device according to any one of claims 1 to 3, characterized in that: include: 1) The hydrogen gas introduced into the primary hydrogen metallurgical reactor from the secondary hydrogen metallurgical reactor enters the pressure swing adsorption device, water vapor in the hydrogen gas is separated in the pressure swing adsorption device, and the pure hydrogen gas from which the water vapor is separated enters the heat exchanger; 2) The water vapor separated from the pressure swing adsorption device enters the microwave heating device for heating, and the heated water vapor also enters the heat exchanger to exchange heat with pure hydrogen. The pure hydrogen after heat exchange is heated to 700-950°C and sent to the primary hydrogen metallurgical reactor.

5. The method for using a hydrogen metallurgical supplementary heating device according to claim 4, characterized in that: The power of the microwave heater is 3500-20000W, and the heating temperature ranges from 80-1500°C.

6. The method for using a hydrogen metallurgical supplementary heating device according to claim 4, characterized in that: The adsorbent of the pressure swing adsorption device is activated alumina.

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