Coking coal furnace hydrogen extraction system based on efficient membrane separation

Abstract

The utility model discloses a coking coal furnace hydrogen extraction system based on efficient membrane separation, which belongs to the field of comprehensive utilization of coking coal furnaces, aims to improve the comprehensive utilization rate of coke oven gas, and comprises a desulfurization unit, one end of the desulfurization unit is connected with a coke oven coal input pipeline, and the other end of the desulfurization unit is connected with a filter unit as an output end. The filtering unit is used for removing tar, dust and naphthalene impurities of the coke oven gas; the high-efficiency membrane separation unit is connected with the output end of the filtering unit, and the output end, for generating methane gas, of the high-efficiency membrane separation unit is connected with the power generation unit.

Description

Technical Field

[0001] This utility model belongs to the field of comprehensive utilization of coking coal ovens, and relates to a hydrogen extraction system for coking coal ovens based on high-efficiency membrane separation. Background Technology

[0002] Coke oven gas refers to a combustible gas obtained by mixing several types of bituminous coal into coking coal and then dry distilling it at high temperature in a coke oven to produce coke and tar products. Its main components are H2 (55%-70%), CH4 (15%-30%), CO (5%-9%), CO2 (2%-5%), and a small amount of N2, as well as other small amounts of other components.

[0003] Currently, in order to reduce environmental pollution and improve economic efficiency, people are paying more and more attention to the utilization of coke oven gas. In traditional processes, coke oven gas is usually treated with desulfurization to produce methanol and ammonia, but this method and equipment have low utilization rates for other gases from coke ovens. Utility Model Content

[0004] The purpose of this invention is to provide a coking coal oven hydrogen extraction system based on high-efficiency membrane separation, which solves the problem of low coking coal gas utilization rate in the prior art.

[0005] The technical solution adopted in this utility model is a coking coal oven hydrogen extraction system based on high-efficiency membrane separation, including a desulfurization unit. One end of the desulfurization unit is connected to the coking coal gas input pipeline, and the other end is connected to a filter unit as an output end. The filter unit is used to remove impurities such as tar, dust, and naphthalene from the coking coal gas. It also includes a high-efficiency membrane separation device connected to the output end of the filter unit. The high-efficiency membrane separation device is used to purify hydrogen in the coking coal gas. The high-efficiency membrane separation device has an output end for permeated hydrogen-rich gas and an output end for unpermeated methane-rich gas. The output end for permeated hydrogen-rich gas is connected to a hydrogen-rich gas pressurization unit.

[0006] Furthermore, the output of the unpermeated methane-rich gas from the high-efficiency membrane separation device is connected to the power generation unit.

[0007] Furthermore, the desulfurization unit is a dry desulfurization device.

[0008] Furthermore, the dry desulfurization unit includes a dry desulfurization hydrogenation catalyst unit and a dry desulfurization medium-temperature zinc oxide desulfurization unit. The input end of the dry desulfurization hydrogenation catalyst unit is connected to the coke oven coal input pipeline, and the output end is connected to the input end of the dry desulfurization medium-temperature zinc oxide desulfurization unit. The output end of the dry desulfurization medium-temperature zinc oxide desulfurization unit is connected to the filter unit.

[0009] Furthermore, the filtration unit is a coalescing filter.

[0010] The beneficial effects of this invention are: after the clean coal gas from desulfurization is separated into coke oven gas by a high-efficiency membrane separation unit, the hydrogen-rich gas that has permeated through is pressurized to provide a hydrogen source for ammonia synthesis; this invention effectively improves the gas utilization rate of coke oven gas, and through the filtration unit, the hydrogen obtained by the high-efficiency membrane separation device has a higher purity. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of a coke oven gas hydrogen extraction system according to an embodiment of this utility model;

[0012] In the diagram: 1. Coke oven gas pipeline after recovery from chemical products; 2. Dry desulfurization and hydrogenation catalyst tank; 3. Dry desulfurization medium-temperature zinc oxide desulfurization tank; 4. Dry desulfurization unit; 5. Filter; 6. High-efficiency membrane separation device; 7. Hydrogen-rich gas pressurization device; 8. Gas turbine power generation unit. Detailed Implementation

[0013] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments. Rather, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. After reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0014] An embodiment of the coking coal furnace hydrogen extraction system based on high-efficiency membrane separation according to this utility model is as follows: Figure 1 As shown, the system mainly includes a dry desulfurization unit 4, a filter 5, a high-efficiency membrane separation device 6, a hydrogen-rich gas pressurization device 7, and a gas turbine power generation device 8. The dry desulfurization unit 4 specifically includes a dry desulfurization hydrogenation catalyst tank 2 and a dry desulfurization medium-temperature zinc oxide desulfurization tank 3. The input end of the dry desulfurization hydrogenation catalyst tank 2 is connected to the coke oven gas self-chemical product recovery pipeline 1. A valve is installed on the coke oven gas self-chemical product recovery pipeline 1. The output end of the dry desulfurization hydrogenation catalyst tank 2 is connected to the input end of the dry desulfurization medium-temperature zinc oxide desulfurization tank 3 through a valve.

[0015] The dry desulfurization hydrogenation catalyst tank 2 is filled with iron-based hydrogenation catalyst, which is mainly used to convert organic sulfur (COS, CS2, C4H4S) in coke oven gas into inorganic sulfur (H2S). The dry desulfurization medium-temperature zinc oxide desulfurization tank 3 is filled with zinc oxide, which is used to absorb inorganic sulfur (H2S). After passing through the dry desulfurization unit 4, the sulfides in the coke oven gas are basically removed.

[0016] In addition, the output end of the dry desulfurization medium-temperature zinc oxide desulfurization tank 3 is connected to the input end of the filter 5 via a valve. In this embodiment, the filter is a coalescing filter, used to remove residual tar, dust, naphthalene and other impurities from the coke oven gas. The output end of the filter 5 is connected to the high-efficiency membrane separation device 6. The membrane of the high-efficiency membrane separation device is a hollow fiber membrane, used for the purification of hydrogen in the coke oven gas. The high-efficiency membrane separation device 6 is provided with two outlets. The outlet for permeated hydrogen-rich gas is connected to the hydrogen-rich gas pressurization device, and the outlet for unpermeated methane-rich gas is connected to the gas turbine power generation unit 8.

[0017] The hydrogen-rich gas pressurization unit 7 mainly consists of a two-stage, four-section reciprocating compressor used for pressurizing hydrogen-rich gas. The gas turbine power generation unit 8 uses a Sola generator set, which can generate electricity while simultaneously producing a certain amount of medium-pressure steam, thus enabling it to both generate electricity and produce medium-pressure steam.

[0018] The main technological processes involved in this embodiment are as follows:

[0019] The coke oven gas from the chemical product recovery pipeline 1 is connected to the dry desulfurization and hydrogenation catalyst tank 2 via a switch. When the switch is opened, the coke oven gas from the chemical product recovery pipeline 1 enters the dry desulfurization and hydrogenation catalyst tank 2. The dry desulfurization and hydrogenation catalyst tank 2 is filled with an iron-based hydrogenation catalyst, which is mainly used to convert organic sulfur (COS, CS2, C4H4S) in the coke oven gas into inorganic sulfur (H2S).

[0020] The product enters the dry desulfurization hydrogenation catalyst tank 2 through the output end of the dry desulfurization medium-temperature zinc oxide desulfurization tank 3. The dry desulfurization medium-temperature zinc oxide desulfurization tank 3 is filled with zinc oxide, which is used to absorb the inorganic sulfur (H2S) treated in the dry desulfurization hydrogenation catalyst tank 2.

[0021] Clean coal gas from dry desulfurization passes through filter 5 and then enters the high-efficiency membrane separation unit 6. After separation of coke oven gas by the high-efficiency membrane separation unit 6, the permeated hydrogen-rich gas is passed into the hydrogen-rich gas pressurization unit 7 for pressurization, providing a hydrogen source for ammonia synthesis. The unpermeated methane-rich gas is used to generate electricity via a gas turbine power generation unit 8, producing a certain amount of medium-pressure steam as a byproduct. In addition, filter 5 is used to filter tar, dust, and catalyst powder from the coal gas.

[0022] This system effectively extracts hydrogen from coke oven gas. The extracted hydrogen-rich gas can be used to produce synthetic ammonia, while the methane-rich gas is used as clean fuel for gas turbine power generation, and a certain amount of medium-pressure steam is produced as a byproduct.

Claims

1. A coking coal furnace hydrogen extraction system based on high-efficiency membrane separation, characterized in that, The system includes a desulfurization unit, one end of which is connected to a coke oven coal input pipeline, and the other end, as an output end, is connected to a filtration unit. The filtration unit is used to remove impurities such as tar, dust, and naphthalene from the coke oven gas. It also includes a high-efficiency membrane separation device connected to the output end of the filtration unit. This high-efficiency membrane separation device is used to purify hydrogen in the coke oven gas. The high-efficiency membrane separation device has an output end for permeated hydrogen-rich gas and an output end for unpermeated methane-rich gas. The output end for permeated hydrogen-rich gas is connected to a hydrogen-rich gas pressurization unit.

2. The high-efficiency membrane separation coking coal furnace hydrogen extraction system according to claim 1, characterized in that, The output end of the unpermeated methane-rich gas from the high-efficiency membrane separation device is connected to the power generation unit.

3. The high-efficiency membrane separation coking coal furnace hydrogen extraction system according to claim 1, characterized in that, The desulfurization unit is a dry desulfurization device.

4. The high-efficiency membrane separation coking coal oven hydrogen extraction system according to claim 3, characterized in that, The dry desulfurization unit includes a dry desulfurization hydrogenation catalyst unit and a dry desulfurization medium-temperature zinc oxide desulfurization unit. The input end of the dry desulfurization hydrogenation catalyst unit is connected to the coke oven coal input pipeline, and the output end is connected to the input end of the dry desulfurization medium-temperature zinc oxide desulfurization unit. The output end of the dry desulfurization medium-temperature zinc oxide desulfurization unit is connected to a filter unit.

5. The high-efficiency membrane separation coking coal oven hydrogen extraction system according to any one of claims 1 to 4, characterized in that, The filtration unit is a coalescing filter.

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