Hydrogen-based shaft furnace carbon dioxide utilization process

Abstract

The invention relates to the technical field of hydrogen metallurgy, and discloses a hydrogen-based shaft furnace carbon dioxide utilization process which comprises a gas treatment tower system, a process gas loop, a process gas compressor, thermal oxide carbon capture equipment, carbon dioxide purification equipment and a storage tank. Carbon dioxide gas is introduced into an existing nitrogen pipeline (mainly a shaft furnace top nitrogen system, all loop purging nitrogen systems, a compressor gas seal nitrogen system and the like), after carbon dioxide is used for replacing original nitrogen, the carbon dioxide capable of being trapped in the circulation of the shaft furnace is increased, and the nitrogen which cannot be collected is reduced; the control and use of the whole gas loop are changed, the working efficiency of the hydrogen-based shaft furnace is improved, meanwhile, the tail gas combustion control of the reduction loop in the combustion control of the heating furnace is optimized, the nitrogen is added to assist the combustion control, and the safety SIS interlocking control is added.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen metallurgy, and in particular to a hydrogen-based vertical furnace carbon dioxide utilization process. Background Art

[0002] In vertical furnace production, natural gas, coke oven gas and other gas sources are required as reducing gases, and CO is generated during the reduction process. 2 , H 2 O and N 2 At the same time, a large amount of nitrogen is used in the system during the system circulation process, such as pressure-equalizing nitrogen filling and sealed nitrogen filling. This part of nitrogen is also injected into the large system circulation of the reduction gas of the vertical furnace. In the existing vertical furnace process, H 2 O is condensed and taken out through the drainage system, CO 2 With the CO2 capture system, the captured CO2 is directly discharged into the atmosphere through the chimney, while the N2 in the reduced cycle gas is 2 There is no good collection and treatment method, so the only option is to enrich and circulate the gas in the system or to release or burn the circulating gas. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a hydrogen-based vertical furnace carbon dioxide utilization process, which solves the problems raised in the above-mentioned background technology.

[0004] To solve the above technical problems, according to one aspect of the present invention, more specifically, a hydrogen-based vertical furnace carbon dioxide utilization process, comprising a gas treatment tower system, a process gas loop, a process gas compressor, a thermal oxidation carbon capture device, a carbon dioxide purification device and a storage tank, characterized in that the gas treatment tower system: is used to cool and dedust the gas passing through the top of the hydrogen-based vertical furnace;

[0005] Process gas circuit: used to guide the gas flow and control the gas channel;

[0006] Process gas compressor: used to compress process gas and purify and pressurize carbon dioxide;

[0007] Carbon dioxide capture: used to capture carbon dioxide in process gases;

[0008] Carbon dioxide purification: used to purify the captured carbon dioxide;

[0009] Storage tank: Stores purified carbon dioxide and delivers carbon dioxide to the nitrogen system.

[0010] Furthermore, the improvement of the process gas circulation inside the gas-based vertical furnace comprises the following steps;

[0011] S1. introducing the process gas generated by the hydrogen-based vertical furnace into the gas treatment tower system, and using the process gas loop in the gas treatment tower system to transmit the process gas;

[0012] S2, pressurizing the gas in the loop by a process gas compressor;

[0013] S3, capturing carbon dioxide from process gas in the loop, purifying the carbon dioxide, and storing it in a storage tank;

[0014] S4. The carbon dioxide in the storage tank is transported to the nitrogen system at the top of the vertical furnace, the nitrogen purge systems of each circuit, and the compressor gas seal nitrogen system, thereby completing the transformation of the circulating process gas circuit.

[0015] Furthermore, the purity of the carbon dioxide delivered by the storage tank is likely to affect the circulation of the original nitrogen equipment. Therefore, it is necessary to detect the purity of the carbon dioxide purification, and the calculation formula is:

[0016]

[0017] Where, T is the purity of carbon dioxide purification; Q L is the flow rate of carbon dioxide in the process gas loop; V C is the volume of carbon dioxide and process gas loop; V T is the total volume of process gas; Q T is the total flow rate of process gas; C MaX is the maximum total amount of carbon dioxide in the process gas; C in is the number of moles of thermally oxidized carbon recovered after the purification process; C re is the number of moles of carbon dioxide in the process gas.

[0018] Furthermore, in S1, a portion of the gas in the process gas loop enters the heating furnace for combustion.

[0019] Furthermore, in S3, after carbon dioxide in the process gas is captured, it is discharged to the outside through a chimney provided in the equipment.

[0020] Furthermore, in S3, an external reserved port is added in the carbon dioxide purification process to expand the carbon dioxide storage tank to facilitate subsequent liquefaction and use by back-end users.

[0021] The beneficial effects of the hydrogen-based vertical furnace carbon dioxide utilization process of the present invention are:

[0022] After capturing carbon dioxide, the present invention purifies and pressurizes the thermally oxidized carbon, and allows the carbon dioxide gas to pass into the existing nitrogen pipeline (mainly the nitrogen system at the top of the vertical furnace, the nitrogen systems for purging each loop, the nitrogen system for gas sealing of the compressor, etc.). After the original nitrogen is replaced by carbon dioxide, the carbon dioxide that can be captured in the vertical furnace cycle increases, and the nitrogen that cannot be collected decreases, so that the control and use of the entire gas circuit are changed, and the working efficiency of the hydrogen-based vertical furnace is increased. At the same time, the present invention optimizes the reduction loop tail gas combustion control in the heating furnace combustion control, adds nitrogen-assisted combustion control, and adds safety SIS interlocking control. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0024] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0026] like Figure 1 As shown, according to one aspect of the present invention, a hydrogen-based vertical furnace carbon dioxide utilization process is provided, comprising a gas treatment tower system, a process gas loop, a process gas compressor, a thermal oxidation carbon capture device, a carbon dioxide purification device and a storage tank, characterized in that the gas treatment tower system: is used to cool and remove dust from the gas passing through the top of the hydrogen-based vertical furnace;

[0027] Process gas circuit: used to guide the gas flow and control the gas channel;

[0028] Process gas compressor: used to compress process gas and purify and pressurize carbon dioxide;

[0029] Carbon dioxide capture: used to capture carbon dioxide in process gases;

[0030] Carbon dioxide purification: used to purify the captured carbon dioxide;

[0031] Storage tank: Stores purified carbon dioxide and delivers carbon dioxide to the nitrogen system.

[0032] In this embodiment, the process gas circulation inside the gas-based vertical furnace is improved, including the following steps:

[0033] S1. introducing the process gas generated by the hydrogen-based vertical furnace into the gas treatment tower system, and using the process gas loop in the gas treatment tower system to transmit the process gas;

[0034] S2, pressurizing the gas in the loop by a process gas compressor;

[0035] S3, capturing carbon dioxide from process gas in the loop, purifying the carbon dioxide, and storing it in a storage tank;

[0036] S4. The carbon dioxide in the storage tank is transported to the nitrogen system at the top of the vertical furnace, the nitrogen purge systems of each circuit, and the compressor gas seal nitrogen system, thereby completing the transformation of the circulating process gas circuit.

[0037] In this embodiment, the purity of carbon dioxide delivered by the storage tank is likely to affect the circulation of the original nitrogen equipment. Therefore, it is necessary to detect the purity of carbon dioxide purification, and the calculation formula is:

[0038]

[0039] Where, T is the purity of carbon dioxide purification; Q L is the flow rate of carbon dioxide in the process gas loop; V C is the volume of carbon dioxide and process gas loop; V T is the total volume of process gas; Q T is the total flow rate of process gas; C MaX is the maximum total amount of carbon dioxide in the process gas; C in is the number of moles of thermally oxidized carbon recovered after the purification process; C re is the number of moles of carbon dioxide in the process gas.

[0040] In this embodiment, in S1, a portion of the gas in the process gas loop enters the heating furnace for combustion. Further, the reduction loop tail gas combustion control in the heating furnace combustion control is optimized, and nitrogen-assisted combustion control is added, and safety SIS interlocking control is added.

[0041] In this embodiment, the power monitoring module includes a current detection module and an alarm buzzer module;

[0042] Current detection module: In S3, after the carbon dioxide in the process gas is captured, it is discharged to the outside through the chimney set in the equipment. Furthermore, after the carbon dioxide in the process gas is captured, the remaining gas is discharged through the chimney to reduce the gas inside the equipment and increase the circulation efficiency of the gas inside the equipment.

[0043] In this embodiment, in S3, an external reserved port is added in the carbon dioxide purification process. Further, by expanding the carbon dioxide storage tank, subsequent liquefaction and use by back-end users are facilitated.

[0044] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention also fall within the protection scope of the present invention.

Claims

1. A hydrogen-based vertical furnace carbon dioxide utilization process, comprising a gas treatment tower system, a process gas loop, a process gas compressor, a thermal oxidation carbon capture device, a carbon dioxide purification device and a storage tank, characterized in that: The gas treatment tower system is used to cool and remove dust from the gas passing through the top of the hydrogen-based vertical furnace; Process gas circuit: used to guide the gas flow and control the gas channel; Process gas compressor: used to compress process gas and purify and pressurize carbon dioxide; Carbon dioxide capture: used to capture carbon dioxide in process gases; Carbon dioxide purification: used to purify the captured carbon dioxide; Storage tank: Stores purified carbon dioxide and delivers carbon dioxide to the nitrogen system.

2. A hydrogen-based vertical furnace carbon dioxide utilization process according to claim 1, characterized in that: The steps include: S1. introducing the process gas generated by the hydrogen-based vertical furnace into the gas treatment tower system, and using the process gas loop in the gas treatment tower system to transmit the process gas; S2, pressurizing the gas in the loop by a process gas compressor; S3, capturing carbon dioxide from process gas in the loop, purifying the carbon dioxide, and storing it in a storage tank; S4. The carbon dioxide in the storage tank is transported to the nitrogen system at the top of the vertical furnace, the nitrogen purge systems of each circuit, and the compressor gas seal nitrogen system, thereby completing the transformation of the circulating process gas circuit.

3. A hydrogen-based vertical furnace carbon dioxide utilization process according to claim 2, characterized in that: The purity of carbon dioxide delivered by the storage tank is likely to affect the circulation of the original nitrogen equipment. Therefore, it is necessary to test the purity of carbon dioxide purification, and the calculation formula is: Where, T is the purity of carbon dioxide purification; Q L is the flow rate of carbon dioxide in the process gas loop; V C is the volume of carbon dioxide and process gas loop; V T is the total volume of process gas; Q T is the total flow rate of process gas; C Max is the maximum total amount of carbon dioxide in the process gas; C in is the number of moles of thermally oxidized carbon recovered after the purification process; C re is the number of moles of carbon dioxide in the process gas.

4. A hydrogen-based vertical furnace carbon dioxide utilization process according to claim 2, characterized in that: In S1, a portion of the gas in the process gas loop enters the heating furnace for combustion.

5. The hydrogen-based vertical furnace carbon dioxide utilization process according to claim 1, characterized in that: In S3, carbon dioxide in the process gas is captured and then discharged to the outside through a chimney provided in the equipment.

6. The hydrogen-based vertical furnace carbon dioxide utilization process according to claim 1, characterized in that: In S3, an external reserved port is added in the carbon dioxide purification process, and the carbon dioxide storage tank is expanded to facilitate subsequent liquefaction and use by back-end users.

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