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CN-117165345-B - Hydrogenation energy station for purifying hydrogen-doped natural gas by multistage membrane separation method

CN117165345BCN 117165345 BCN117165345 BCN 117165345BCN-117165345-B

Abstract

The invention discloses a hydrogenation energy station for purifying hydrogen-doped natural gas by using a multistage membrane separation method, belonging to the technical field of hydrogen purification. The invention solves the problem that the hydrogen fuel cell is difficult to obtain the standard hydrogen with the purity required by the hydrogen fuel cell by purifying the hydrogen-doped natural gas in the prior art, the multi-stage membrane separation method purification system is connected with the urban hydrogen-doped natural gas pipeline network, the permeation side of the multi-stage membrane separation method purification system is sequentially connected with the hydrogen compression unit, the hydrogen storage unit and the hydrogenation zone, the intelligent regulation and control system comprises a controller and a visual screen, the controller is used for controlling the multi-stage membrane separation method purification system, and the visual screen is used for displaying the running condition of the hydrogenation energy station. The invention realizes the extraction of the hydrogen with the purity required by the hydrogen-doped natural gas supply hydrogen fuel cell, and the hydrogenation energy station is provided with the photovoltaic power generation and supply system, the electric storage area and the natural gas compressor in the arrangement process, and the charging area are additionally arranged, so that the invention can be applied to the hydrogen-doped natural gas pipelines with different pressure levels to extract the hydrogen for supplying and supplying energy.

Inventors

  • HAN XIAO
  • TANG JIANFENG
  • KONG RAN

Assignees

  • 中国石油大学(华东)

Dates

Publication Date
20260505
Application Date
20230907

Claims (7)

  1. 1. The hydrogenation energy station for purifying the hydrogen-doped natural gas by utilizing the multistage membrane separation method is characterized by comprising a multistage membrane separation method purification system, a photovoltaic power generation and supply system, an electric storage area, a hydrogen compression unit, a hydrogen storage unit, a natural gas compressor, a hydrogenation area, an air charging area, a charging area and an intelligent regulation and control system; The multi-stage membrane separation purification system is connected with a town hydrogen-doped natural gas pipe network; The permeation side of the multi-stage membrane separation purification system is sequentially connected with the hydrogen compression unit, the hydrogen storage unit and the hydrogenation zone; The residual seepage side of the multi-stage membrane separation purification system is sequentially connected with a natural gas compressor and an air-entrapping area; the photovoltaic power generation and supply system, the electric storage area and the charging area are sequentially connected, and the electric storage area provides power for the multi-stage membrane separation purification system, the hydrogen compression unit and the natural gas compressor; The intelligent regulation and control system comprises a controller and a visual screen, wherein the intelligent regulation and control system is connected with the multi-stage membrane separation purification system, the photovoltaic power generation and supply system, the electric storage area, the hydrogen compression unit, the hydrogen storage unit, the natural gas compressor, the hydrogenation area, the gas charging area and the charging area, the controller is used for controlling the multi-stage membrane separation purification system, and the visual screen is used for displaying the running condition of the hydrogenation energy station; the town hydrogen-adding natural gas pipe network comprises a high-pressure town hydrogen-adding natural gas pipe (1), a medium-pressure town hydrogen-adding natural gas pipe (12) and a low-pressure town hydrogen-adding natural gas pipe (11); the multi-stage membrane separation method purification system comprises a high-pressure membrane separation system and a medium-pressure membrane separation system, and the high-pressure membrane separation system and the medium-pressure membrane separation system are connected with a hydrogen compression unit; The high-pressure town hydrogen-doped natural gas pipeline (1) is connected with the high-pressure membrane separation system, the medium-pressure town hydrogen-doped natural gas pipeline (12) is connected with the medium-pressure membrane separation system, and the low-pressure town hydrogen-doped natural gas pipeline (11) is connected with the high-pressure membrane separation system and the retentate side of the medium-pressure membrane separation system; The high-pressure membrane separation system comprises a high-pressure regulating valve (2), a high-pressure membrane separation system heating heat exchanger (3), a high-pressure membrane separation system primary membrane separator (A), a high-pressure membrane separation system secondary membrane separator (B) and a high-pressure membrane separation system cooling heat exchanger (10); The medium-pressure membrane separation system comprises a medium-pressure regulating valve (13), a medium-pressure membrane separation system heating heat exchanger (14), a medium-pressure membrane separation system primary membrane separator (C), a primary separation vacuum pump (18), a compressor (19), a secondary separation vacuum pump (21), a medium-pressure membrane separation system secondary membrane separator (D) and a medium-pressure membrane separation system cooling heat exchanger (24); The membrane materials of the primary membrane separator of the multi-stage membrane separation purification system are hollow fiber carbon molecular sieve membranes, and the membrane materials of the secondary membrane separator of the multi-stage membrane separation purification system are hollow fiber metal mixed matrix membranes.
  2. 2. The hydrogenation energy station for purifying hydrogen-doped natural gas by using a multistage membrane separation method according to claim 1, wherein the high-pressure town hydrogen-doped natural gas pipeline (1) is connected with the inlet of a high-pressure regulating valve (2), the outlet of the high-pressure regulating valve (2) is connected with the inlet of a high-pressure membrane separation system heating heat exchanger (3), the high-pressure membrane separation system primary membrane separator (A) is provided with a high-pressure membrane separation system primary membrane separator feeding side (4), a high-pressure membrane separation system primary membrane separator residual side (5) and a high-pressure membrane separation system primary membrane separator permeation side (6), the outlet of the high-pressure membrane separation system heating heat exchanger (3) is connected with a high-pressure membrane separation system primary membrane separator feeding side (4), the high-pressure membrane separation system secondary membrane separator (B) is provided with a high-pressure membrane separation system secondary membrane separator feeding side (7), a high-pressure membrane separation system secondary membrane separator permeation side (8) and a high-pressure membrane separation system secondary membrane separator residual side (9), the high-pressure membrane separation system primary membrane separator (6) is connected with the high-pressure membrane separation system secondary membrane separator (7) through the high-pressure membrane separation system primary membrane separator residual side (9), the permeation side (8) of the secondary membrane separator of the high-pressure membrane separation system is connected with a hydrogen compression unit.
  3. 3. The hydrogenation energy station for purifying hydrogen-loaded natural gas by using a multistage membrane separation method according to claim 2, wherein the medium pressure town hydrogen-loaded natural gas pipeline (12) is connected with the inlet of a medium pressure regulating valve (13), the outlet of the medium pressure regulating valve (13) is connected with the inlet of a medium pressure membrane separation system temperature rising heat exchanger (14), the medium pressure membrane separation system primary membrane separator (C) is provided with a medium pressure membrane separation system primary membrane separator feeding side (15), a medium pressure membrane separation system primary membrane separator retentate side (16) and a medium pressure membrane separation system primary membrane separator permeate side (17), the outlet of the medium pressure membrane separation system temperature rising heat exchanger (14) is connected with the medium pressure membrane separation system primary membrane separator feeding side (15), the medium pressure membrane separation system secondary membrane separator (D) is provided with a medium pressure membrane separation system secondary membrane separator feeding side (20), a medium pressure membrane separation system secondary membrane permeate side (22) and a medium pressure membrane separation system secondary membrane separator surplus side (23), the medium pressure membrane separation system primary membrane separator permeate side (17) is connected with the medium pressure membrane separation system secondary membrane separator (16), the medium pressure membrane separation system secondary membrane separator (19) and the medium pressure membrane separation system secondary membrane separator (23) is connected with the medium pressure membrane separation system secondary membrane separator (16) through the medium pressure membrane separation system secondary membrane separator feed side (24), the permeation side (22) of the secondary membrane separator of the medium-pressure membrane separation system is connected with a hydrogen compression unit through a secondary separation vacuum pump (21).
  4. 4. A hydrogenation energy station for purifying hydrogen-loaded natural gas by multistage membrane separation according to claim 3, wherein the control method of the high pressure membrane separation system comprises the following steps: the method comprises the steps that a high-pressure regulating valve in a high-pressure membrane separation system and a high-pressure membrane separation system heating heat exchanger are controlled through a controller, generated data are stored, and the generated data in the high-pressure membrane separation system are displayed in real time through a visual screen; The raw gas of the high-pressure town hydrogen-doped natural gas pipeline enters a high-pressure membrane separation system, and the mole fraction of the permeation component hydrogen in the raw gas is output Then, regulating the pressure through a high-pressure regulating valve, judging whether the driving pressure difference of the first-stage membrane separator of the high-pressure membrane separation system meets the requirement, if not, continuously regulating the pressure through the high-pressure regulating valve until the driving pressure difference meets the requirement, and if so, outputting the side pressure of the feeding material of the first-stage membrane separator of the high-pressure membrane separation system Heating by a high-pressure membrane separation system heating heat exchanger, judging whether the operation temperature of a first-stage membrane separator of the high-pressure membrane separation system meets the requirement, if not, continuing to exchange heat by the high-pressure membrane separation system heating heat exchanger until the operation temperature meets the requirement, and if so, outputting the operation temperature of the first-stage membrane separator of the high-pressure membrane separation system Then carrying out primary membrane separation of the high-pressure membrane separation system, further judging whether the purity of hydrogen at the permeation side of the primary membrane separator of the high-pressure membrane separation system is more than 90%, if not, continuing to regulate the pressure through a high-pressure regulating valve, and recycling the operation until the purity of the hydrogen is more than 90%, if so, outputting the purity of the hydrogen and the volume flow of gas at the permeation side of the primary membrane separator of the high-pressure membrane separation system Permeation side pressure of primary membrane separator of high-pressure membrane separation system And mole fraction of permeate component hydrogen on the permeate side of the primary membrane separator of the high pressure membrane separation system Then, carrying out secondary membrane separation of the high-pressure membrane separation system, judging whether the purity of hydrogen at the permeation side of the secondary membrane separator of the high-pressure membrane separation system is more than 99.97%, if not, continuing to start the operation from the raw gas of the high-pressure town hydrogen-doped natural gas pipeline entering the high-pressure membrane separation system, and circulating the operation until the purity of the hydrogen is more than 99.97%, if so, outputting the purity of the hydrogen and the volume flow of the gas at the permeation side of the secondary membrane separator of the high-pressure membrane separation system Side pressure of feed side of secondary membrane separator of high-pressure membrane separation system Permeation side pressure of secondary membrane separator of high-pressure membrane separation system Operating temperature of secondary membrane separator of high-pressure membrane separation system And mole fraction of permeate component hydrogen on the permeate side of the high pressure membrane separation system secondary membrane separator Judging the permeation flux of hydrogen If the hydrogen supply requirement of the hydrogenation energy station is met, if not, the process is started from the feed gas of the high-pressure town hydrogen-doped natural gas pipeline to enter the high-pressure membrane separation system until the requirement is met, and if so, the high-pressure membrane separation system is finished.
  5. 5. The hydrogenation energy station for purifying hydrogen-loaded natural gas by multistage membrane separation according to claim 4, wherein the control method of the medium pressure membrane separation system comprises the following steps: The medium pressure regulating valve, the medium pressure membrane separation system heating heat exchanger and the compressor in the medium pressure membrane separation system are controlled by the controller, the generated data are stored, and the data generated in the medium pressure membrane separation system are displayed in real time by the visual screen, and the specific steps are as follows: The raw gas of the medium-pressure town hydrogen-doped natural gas pipeline enters a high-pressure membrane separation system, and the mole fraction of the permeation component hydrogen in the raw gas is output And then regulating the pressure through a medium pressure regulating valve, judging whether the driving pressure difference of the first-stage membrane separator of the medium pressure membrane separation system meets the requirement, if not, continuously regulating the pressure through the medium pressure regulating valve until the driving pressure difference meets the requirement, and if so, outputting the side pressure of the feeding side of the first-stage membrane separator of the medium pressure membrane separation system Heating by a medium-pressure membrane separation system heating heat exchanger, judging whether the operation temperature of a first-stage membrane separator of the medium-pressure membrane separation system meets the requirement, if not, continuing to exchange heat by the medium-pressure membrane separation system heating heat exchanger until the operation temperature meets the requirement, and if so, outputting the operation temperature of the first-stage membrane separator of the medium-pressure membrane separation system Then carrying out primary membrane separation of the medium-pressure membrane separation system, further judging whether the purity of hydrogen at the permeation side of the primary membrane separator of the medium-pressure membrane separation system is more than 90%, if not, continuing to adjust the pressure through a medium-pressure regulating valve until the purity of the hydrogen is more than 90%, and if so, outputting the purity of the hydrogen and the volume flow of gas at the permeation side of the primary membrane separator of the medium-pressure membrane separation system Side pressure of permeation of primary membrane separator of medium pressure membrane separation system And mole fraction of permeate component hydrogen on the permeate side of a primary membrane separator of a medium pressure membrane separation system Then compressing by a compressor, judging whether the driving pressure difference of the secondary membrane separator of the medium-pressure membrane separation system meets the requirement, if not, continuously adjusting the pressure by the compressor until the driving pressure difference meets the requirement, and if so, outputting the side pressure of the feeding side of the secondary membrane separator of the medium-pressure membrane separation system And then carrying out secondary membrane separation of the medium-pressure membrane separation system, judging whether the hydrogen purity of the permeation side of the secondary membrane separation system of the medium-pressure membrane separation system is more than 99.97%, if not, continuing to start compression by a compressor, and circulating the flow until the hydrogen purity is more than 99.97%, if so, outputting the hydrogen purity and the volume flow of the gas of the permeation side of the secondary membrane separation system of the medium-pressure membrane separation system Side pressure of feeding material of secondary membrane separator of medium-pressure membrane separation system Two-stage membrane separator permeate side pressure of medium-pressure membrane separation system Operating temperature of secondary membrane separator of' and medium pressure membrane separation systems Mole fraction of' and permeate component hydrogen at the permeate side of a secondary membrane separator of a medium pressure membrane separation system Further judge the hydrogen permeation flux If the hydrogen supply requirement of the hydrogenation energy station is met, if not, the raw gas of the medium-pressure town hydrogen-doped natural gas pipeline is continuously fed into the high-pressure membrane separation system, the above flow is circulated until the requirement is met, and if so, the medium-pressure membrane separation system is finished.
  6. 6. The hydrogenation energy station for purifying hydrogen-depleted natural gas by multistage membrane separation according to claim 5, wherein the mole fraction of permeate hydrogen on the permeate side of the first stage membrane separator of the high pressure membrane separation system Equal to the molar fraction of permeate hydrogen on the feed side of the secondary membrane separator of the high pressure membrane separation system 。
  7. 7. The hydrogenation energy station for purifying hydrogen-depleted natural gas by multistage membrane separation according to claim 6, wherein the mole fraction of permeate component hydrogen on the permeate side of the first stage membrane separator of the medium pressure membrane separation system Equal to the molar fraction of the permeate fraction hydrogen at the feed side of the secondary membrane separator of the medium-pressure membrane separation system 。

Description

Hydrogenation energy station for purifying hydrogen-doped natural gas by multistage membrane separation method Technical Field The invention relates to a hydrogenation energy station for purifying hydrogen-doped natural gas, in particular to a hydrogenation energy station for purifying hydrogen-doped natural gas by using a multistage membrane separation method, and belongs to the technical field of hydrogen purification. Background At present, hydrogen is transported mainly by means of a long tube trailer, however, with the increase of the number of hydrogen stations, the long tube trailer is used for transporting the hydrogen to expose the problems of low efficiency and poor economy, and the supply of the hydrogen is difficult to ensure. Therefore, a certain proportion of hydrogen is mixed in the natural gas by utilizing the active natural gas pipeline, the cost and technical problems of hydrogen infrastructure construction are eliminated in a short time, and the space-time allocation scale and efficiency of hydrogen energy are greatly improved. The application of the hydrogen-doped natural gas in the transportation field is still in the research and development stage, for example, if the hydrogen-doped natural gas with the hydrogen-doped ratio of 4% -20% is directly used for a compressed natural gas fuel automobile of a gas station, explosion risks exist in summer high-temperature weather, and in the hydrogen station, the hydrogen fuel cell has higher requirements on the purity of hydrogen, and the purity standard required by the hydrogen fuel cell is that the purity of the hydrogen is more than 99.97%. In summary, the hydrogen with the purity standard required by the hydrogen fuel cell is obtained by purifying the hydrogen-doped natural gas in the energy station, so that the risk that the hydrogen-doped natural gas is directly used for the compressed natural gas fuel automobile is reduced, the supply requirement of hydrogen in the hydrogenation link can be met, and the development of a novel energy station is promoted. The existing mature hydrogen purification method is a pressure swing adsorption method, but is suitable for large-scale gas purification, a large-scale device is required to be equipped, and the purification effect is good when the hydrogen content is more than about 50%, on one hand, the hydrogen loading ratio of the hydrogen-loaded natural gas demonstration project developed at home and abroad is generally between 4% and 20%, if the pressure swing adsorption method is adopted, a large amount of gas is required to be adsorbed, but only a small amount of hydrogen can be recovered, and on the other hand, the daily hydrogenation amount of a conventional hydrogenation station is 300Nm 3/h, and the gas requirement scale is smaller. Thus, pressure swing adsorption is not suitable for purification at the hydrogen utility level, and to meet hydrogen demand, there is a need for an energy source station that can purify hydrogen-loaded natural gas to achieve a purity that meets the hydrogen demand of the fuel cell. Disclosure of Invention The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of the invention. Its purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later. In view of this, in order to solve the problem that it is difficult to purify the hydrogen-doped natural gas to obtain the standard hydrogen with purity required by the hydrogen fuel cell in the prior art, the invention provides a hydrogenation energy station for purifying the hydrogen-doped natural gas by using a multistage membrane separation method. The technical scheme is that the hydrogenation energy station for purifying the hydrogen-doped natural gas by utilizing the multistage membrane separation method comprises a multistage membrane separation method purification system, a photovoltaic power generation and supply system, an electric storage area, a hydrogen compression unit, a hydrogen storage unit, a natural gas compressor, a hydrogenation area, an air entrainment area, a charging area and an intelligent regulation and control system; The multi-stage membrane separation purification system is connected with a town hydrogen-doped natural gas pipe network; The permeation side of the multi-stage membrane separation purification system is sequentially connected with the hydrogen compression unit, the hydrogen storage unit and the hydrogenation zone; The permeation side of the multi-stage membrane separation purification system is sequentially connected with the natural gas compressor and the gas filling area; the photovoltaic power generation and supply system, the electric storage area and