Steam power energy-saving recovery system for hydrogen production from calcium carbide furnace gas

Abstract

The utility model discloses a steam power energy-saving recovery system for hydrogen production from calcium carbide furnace gas, which comprises a calcium carbide furnace gas purification system, a deoxidation tank, a humidifier, a conversion furnace, an absorption tower and PSA (Pressure Swing Adsorption) hydrogen extraction, and further comprises a first steam ejector, and the input end of the first steam ejector is communicated with a first high-pressure steam pipeline; the output end of the first steam ejector is communicated with a first conversion circulating gas pipeline, the output end of the first conversion circulating gas pipeline is communicated with a connecting pipeline between the deoxidizing tank and the humidifier, and the output pipeline of the conversion furnace is communicated with a first conversion gas pipeline; the output end of the first conversion gas pipeline is communicated with the low-pressure input end of the first steam ejector; the device has the beneficial effects that part of shift gas can be sucked back as circulating gas by using the first steam ejector instead of sucking back the shift gas by using a compressor as power, so that the energy consumption of a circulating system is reduced, and the operation cost of hydrogen production from calcium carbide furnace gas is reduced.

Description

Technical Field:

[0001] The utility model belongs to the field of hydrogen production from calcium carbide furnace gas, and particularly relates to a steam power energy-saving recovery system for hydrogen production from calcium carbide furnace gas. Background Art:

[0002] The shift process of calcium carbide furnace gas takes calcium carbide furnace gas (whose main components are CO, CO2, and H2) processed by upstream compression and purification processes as raw materials, and undergoes a shift reaction with steam under the action of a suitable temperature, pressure, and copper-based shift catalyst to obtain hydrogen.

[0003] In the hydrogen production process from calcium carbide furnace gas, the calcium carbide furnace gas from upstream enters the purification treatment system, deoxidation tank, humidifier, shift furnace, and absorption tower in sequence for reaction, and finally hydrogen is extracted through the PSA process. In this process, a part of the shift gas (hydrogen and CO2) generated by the shift furnace enters the subsequent PSA pressure swing adsorption process to extract hydrogen, while the other part of the shift gas is returned to the inlet of the humidifier after being pressurized, and enters the humidifier together with steam to dilute the fresh calcium carbide furnace gas feed, reducing the CO concentration in the fresh calcium carbide furnace gas. In this section of the process system, steam is only used as a reaction raw material gas and is directly transported to the system, and the self-owned kinetic energy of the high-pressure steam is not effectively utilized, resulting in waste of kinetic energy. At the same time, a circulating compressor needs to be added to return the shifted gas after transformation to the inlet of the humidifier, thus increasing equipment investment and operating costs. Summary of the Utility Model:

[0004] The purpose of the utility model is to provide a steam power energy-saving recovery system for hydrogen production from calcium carbide furnace gas, which overcomes the above-mentioned deficiencies of the prior art and effectively solves the existing problem of energy waste in the original system.

[0005] The content of the utility model: A steam power energy-saving recovery system for hydrogen production from calcium carbide furnace gas, including a calcium carbide furnace gas purification system, a deoxidation tank, a humidifier, a shift furnace, an absorption tower, and PSA hydrogen extraction, further including a first steam ejector. A first high-pressure steam pipeline is connected to the input end of the first steam ejector, and a first shifted gas circulation pipeline is connected to the output end of the first steam ejector. The output end of the first shifted gas circulation pipeline is connected to the pipeline connecting the deoxidation tank and the humidifier. A first shifted gas pipeline is connected to the output pipeline of the shift furnace, and the output end of the first shifted gas pipeline is connected to the low-pressure input end of the first steam ejector.

[0006] Further, it further includes a second steam ejector. A second high-pressure steam pipeline is communicated at the input end of the second steam ejector, and a second conversion circulating gas pipeline is communicated at the output end of the second steam ejector. The output end of the second conversion circulating gas pipeline is communicated with the first conversion circulating gas pipeline. A second conversion gas pipeline is communicated on the first conversion gas pipeline, and the output end of the second conversion gas pipeline is communicated with the low-pressure input end of the second steam ejector.

[0007] Further, the input ends of the first high-pressure steam pipeline and the second high-pressure steam pipeline are both communicated with the main high-pressure steam pipeline.

[0008] The beneficial effects of the present utility model: By using the first steam ejector, part of the converted gas can be sucked back as circulating gas, replacing the compressor-powered suction of the converted gas, thereby reducing the energy consumption of the circulating system and reducing the operating cost of hydrogen production from calcium carbide furnace gas. Description of the drawings:

[0009] Figure 1 is a system schematic diagram of the present utility model;

[0010] In the figure, 1 is the calcium carbide furnace gas purification system, 2 is the deoxidation tank, 3 is the humidifier, 4 is the conversion furnace, 5 is the absorption tower, 6 is PSA hydrogen production, 7 is the first steam ejector, 8 is the first high-pressure steam pipeline, 9 is the first conversion circulating gas pipeline, 10 is the first conversion gas pipeline, 11 is the second steam ejector, 12 is the second high-pressure steam pipeline, 13 is the second conversion circulating gas pipeline, 14 is the second conversion gas pipeline, and 15 is the main high-pressure steam pipeline. Specific embodiments:

[0011] For a clearer understanding of the technical features, objectives, and effects of the present utility model, the specific embodiments of the present utility model are now described with reference to the accompanying drawings:

[0012] As Figure 1 shown, the steam power energy-saving recovery system for hydrogen production from calcium carbide furnace gas includes a calcium carbide furnace gas purification system 1, a deoxidation tank 2, a humidifier 3, a conversion furnace 4, an absorption tower 5, and PSA hydrogen production 6. It further includes a first steam ejector 7. A first high-pressure steam pipeline 8 is communicated at the input end of the first steam ejector 7, and a first conversion circulating gas pipeline 9 is communicated at the output end of the first steam ejector 7. The output end of the first conversion circulating gas pipeline 9 is communicated with the connecting pipeline between the deoxidation tank 2 and the humidifier 3. A first conversion gas pipeline 10 is communicated on the output pipeline of the conversion furnace 4, and the output end of the first conversion gas pipeline 10 is communicated with the low-pressure input end of the first steam ejector 7.

[0013] Specifically, by using the first steam ejector 7, part of the converted gas can be sucked back as recycle gas, replacing the suction of the converted gas powered by a compressor, thereby reducing the energy consumption of the recycle system.

[0014] During actual use, the calcium carbide furnace gas enters the hydrogen production system. After the conversion furnace 4 generates converted gas, a part of it continues to be transported to the subsequent PSA hydrogen production process system to produce hydrogen, while another part of the converted gas is sucked back by the suction force of the low-pressure area generated by the first steam ejector 7, and enters the inner cavity of the first steam ejector 7 through the first conversion gas pipeline 10. After mixing with the steam transported by the first high-pressure steam pipeline 8, converted recycle gas is generated. The first converted recycle gas pipeline 9 transports the generated converted recycle gas to the connecting pipeline between the deoxidization tank 2 and the humidifier 3 and is used for subsequent reactions again; during this process, the valve of the first steam ejector 7 can be adjusted to control the intake of steam and converted gas.

[0015] As Figure 1 shown, the calcium carbide furnace gas hydrogen production steam power energy-saving recovery system further includes a second steam ejector conversion furnace 11. At the input end of the second steam ejector conversion furnace 11, a second high-pressure steam pipeline conversion furnace 12 is connected. At the output end of the second steam ejector conversion furnace 11, a second converted recycle gas pipeline conversion furnace 13 is connected. The output end of the second converted recycle gas pipeline conversion furnace 13 is connected to the first converted recycle gas pipeline conversion furnace 9. A second converted gas pipeline conversion furnace 14 is connected to the first converted gas pipeline conversion furnace 10. The output end of the second converted gas pipeline conversion furnace 14 is connected to the low-pressure input end of the second steam ejector conversion furnace 11. The input ends of the first high-pressure steam pipeline conversion furnace 8 and the second high-pressure steam pipeline conversion furnace 12 are both connected to the main high-pressure steam pipeline conversion furnace 15.

[0016] Specifically, when the first steam ejector 7 is under maintenance, the second steam ejector conversion furnace 11 can be started in time to ensure the normal operation of the system.

[0017] During actual use, when the first steam ejector 7 fails and needs to be repaired, the corresponding valves on the first high-pressure steam pipeline 8 and the first converted gas pipeline 10 can be closed to temporarily shut down this part of the system, and the corresponding valves on the second high-pressure steam pipeline 12 and the second converted gas pipeline 14 can be opened to start the standby system. At this time, the gas in the main high-pressure steam pipeline 15 enters the second steam ejector conversion furnace 11 and mixes with the converted gas transported by the second converted gas pipeline 14. The second converted recycle gas pipeline 13 continues to transport the converted gas to the system, enabling the calcium carbide furnace gas hydrogen production system to continue operating.

[0018] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. Hydrogen steam power energy-saving recovery system for carbide furnace gas, comprising a carbide furnace gas purification system (1), a deoxidation tank (2), a humidifier (3), a converter (4), an absorption tower (5) and PSA hydrogen production (6), characterized in that: It further includes a first steam injector (7). A first high-pressure steam pipeline (8) is connected to the input end of the first steam injector (7), and a first conversion recycle gas pipeline (9) is connected to the output end of the first steam injector (7). The output end of the first conversion recycle gas pipeline (9) is connected to the pipeline between the deoxidization tank (2) and the humidifier (3). A first conversion gas pipeline (10) is connected to the output pipeline of the conversion furnace (4), and the output end of the first conversion gas pipeline (10) is connected to the low-pressure input end of the first steam injector (7).

2. The hydrogen production steam power energy-saving recovery system using calcium carbide furnace gas according to claim 1, wherein: It further includes a second steam injector (11). A second high-pressure steam pipeline (12) is connected to the input end of the second steam injector (11), and a second conversion recycle gas pipeline (13) is connected to the output end of the second steam injector (11). The output end of the second conversion recycle gas pipeline (13) is connected to the first conversion recycle gas pipeline (9). A second conversion gas pipeline (14) is connected to the first conversion gas pipeline (10), and the output end of the second conversion gas pipeline (14) is connected to the low-pressure input end of the second steam injector (11).

3. The hydrogen production steam power energy-saving recovery system using carbide furnace gas according to claim 2, wherein: The input ends of the first high-pressure steam pipeline (8) and the second high-pressure steam pipeline (12) are both connected to the main high-pressure steam pipeline (15).

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