CN-122006428-A - Hydrogen membrane purification system based on rotary valve control gas circuit

CN122006428ACN 122006428 ACN122006428 ACN 122006428ACN-122006428-A

Abstract

The application provides a hydrogen membrane purification system based on a rotary valve control gas path, which relates to the technical field of methanol hydrogen production and comprises a membrane purifier, a rotary multi-way valve and a servo motor, wherein crude hydrogen is introduced into a tube side 1 interface of the membrane purifier in the operation process of the membrane purifier, product hydrogen permeates into a tube side 2 interface and a tube side 3 interface of the membrane purifier through a palladium metal membrane, residual tail gas output by the membrane purifier flows out of the tube side 4 interface at the other side of the tube side and is respectively connected with the rotary multi-way valve, a rotary multi-way valve plate consists of a movable valve plate and a static valve plate, one side of the static valve plate is provided with a plurality of gas paths, the gas paths comprise a product gas outlet, a tail gas outlet, an evacuation outlet, a vacuumizing port, a nitrogen inlet and a crude hydrogen inlet gas path, the movable valve plate is internally provided with a plurality of independent paths, and the rotary multi-way valve plate static valve plate is connected with the plurality of gas paths, the tube side and the tube side interface is used for controlling the angle of the movable valve plate by the servo motor, so that the membrane purifier can be purged, vacuumized and the normal operation state can be switched quickly, and the volume of the gas paths and the control equipment can be reduced.

Inventors

GAO YUNTIAN
HAN KUN
LIU WEI
LIANG GONGYOU
ZHANG HAIXING
JIANG BIN
YANG YUWEI

Assignees

国家电投集团科学技术研究院有限公司

Dates

Publication Date: 20260512
Application Date: 20241111

Claims (8)

1. The utility model provides a hydrogen membrane purification system based on rotary valve control gas circuit, its characterized in that, hydrogen membrane purification system based on rotary valve control gas circuit includes membrane purifier, rotatory multiport valve, servo motor, wherein: the membrane purifier is divided into a tube side and a shell side, crude hydrogen is introduced into a tube side 1 interface of the membrane purifier in the operation process of the membrane purifier, product hydrogen permeates into a shell side 2 interface and a shell side 3 interface through a palladium metal membrane, residual tail gas output by the membrane purifier flows out of the other side interface tube side 4 of the tube side, and the tube side 1, the tube side 4, the shell side 2 and the shell side 3 interfaces are respectively connected into a rotary multi-way valve; The rotary multi-way valve block consists of a movable valve block and a static valve block, wherein one side of the static valve block is provided with a plurality of air paths, each air path comprises a product air outlet, a tail gas outlet, an evacuation outlet, a vacuumizing port, a nitrogen inlet and a crude hydrogen inlet air path, and pipelines 1,2,3 and 4 at the other side are respectively connected with interfaces of a tube side 1, a tube side 4, a shell side 2 and a shell side 3 of the membrane purifier, and the movable valve block is internally provided with a plurality of independent passages for connecting the plurality of air paths of the static valve block, the pipelines 1,2,3 and 4; the servo motor is connected with the rotary multi-way valve block and is used for controlling the rotation of the valve block so as to be communicated with a target outlet gas circuit and a target tube side and/or a target shell side interface which are required in the static valve block.
2. The rotary valve controlled gas circuit based hydrogen membrane purification system of claim 1, further comprising a heater having one end interfaced with membrane purifier tube side 1 for heating crude hydrogen to a first set temperature threshold.
3. The rotary valve control gas circuit-based hydrogen membrane purification system as claimed in claim 2, further comprising a heat exchanger, wherein the heat exchanger adopts a three-channel heat exchanger, a first channel is connected with the other end of the heater, a second channel is connected with a tube side 4 interface, and the second channel is connected with a shell side 3 interface, and is used for exchanging heat between product hydrogen and residual tail gas and crude hydrogen heated to a set temperature threshold value, so as to improve heat utilization efficiency.
4. The rotary valve controlled gas circuit based hydrogen membrane purification system according to claim 1, wherein when the rotary multi-way valve is in a nitrogen purging state, the movable valve plate is adjusted to be positioned at an angle of 0 ° by a servo motor, the tube side 4 is connected with the evacuation outlet, the tube side 1 and the shell side 2 are connected, and the shell side 3 is connected with the nitrogen inlet for nitrogen purging.
5. The hydrogen membrane purification system based on a rotary valve control gas path as claimed in claim 1, wherein the movable valve plate is adjusted to be at an angle of-60 ° by a servo motor under the condition that the rotary multi-way valve is in a vacuumizing state, and the tube side 4 and the shell side 3 are connected with a vacuumizing port for vacuumizing.
6. The rotary valve controlled gas path-based hydrogen membrane purification system according to claim 1, wherein when the rotary multi-way valve is in a hydrogen purification state, the movable valve plate is adjusted to be positioned at an angle of-120 ° by a servo motor, the tube side 4 is connected with the tail gas outlet, the shell side 3 is connected with the product gas outlet, and the tube side 1 is connected with the crude hydrogen inlet, so that hydrogen purification can be performed.
7. The rotary valve control gas path-based hydrogen membrane purification system as claimed in claim 1, wherein the operation of the rotary valve control gas path-based hydrogen membrane purification system is divided into four states of pressure maintaining test, heating start, hydrogen purification and shutdown.
8. A rotary valve controlled gas path based hydrogen membrane purification system as defined in claim 7, Under the condition that the hydrogen membrane purification system based on the rotary valve control gas path is in a pressure maintaining test state, the rotary multi-way valve is in a nitrogen purging state, a needle valve during nitrogen purging is closed, nitrogen is introduced until the pressure rises to a first preset pressure, and then the pressure maintaining test is performed; Under the condition that the hydrogen membrane purification system based on the rotary valve control gas circuit is in a starting heating state, nitrogen is introduced to purge a preset time threshold, the state is switched to a vacuumizing state, and after the air pressures at two sides of a metal membrane of the membrane purifier are pumped to a second preset pressure, heating is started until the membrane purifier is heated to a second preset temperature threshold; Under the condition that the hydrogen membrane purification system based on the rotary valve control gas path is in a hydrogen purification state, after the vacuumizing starting heating state is completed, the rotary multi-way valve is switched to the hydrogen purification state, and crude hydrogen is introduced to a third preset pressure of tube side pressure of the membrane purifier, so that product hydrogen after hydrogen purification is obtained; Under the condition that the hydrogen membrane purification system based on the rotary valve control gas circuit is in a shutdown flow state, the rotary multi-way valve is switched to a nitrogen purging state from a hydrogen purification state, and after pressure is released to a standard pressure, the rotary multi-way valve is switched to a vacuumizing state, the air pressures at two sides of a metal membrane of the membrane purifier are pumped to a third preset pressure, and then the rotary multi-way valve is switched to a nitrogen purging state, and nitrogen is flushed into two sides of the metal membrane for preservation and cooling.

Description

Hydrogen membrane purification system based on rotary valve control gas circuit Technical Field The application relates to the technical field of methanol hydrogen production, in particular to a hydrogen membrane purification system based on a rotary valve control gas path. Background The metal film hydrogen purification technology has the advantages of high product hydrogen purity, small equipment size and high hydrogen yield. The metal purification membrane is made of palladium alloy, vanadium alloy, niobium alloy and other materials, the problem of hydrogen embrittlement in a low-temperature hydrogen-containing environment (0-300 ℃) is commonly existed, meanwhile, under the high-temperature condition, oxygen in the air can oxidize some metal components in the alloy material, so that the surface activity of the membrane is reduced, and meanwhile, different membrane supporting structures have requirements on the pressure difference between the inside and the outside of gas and the pressure direction due to the mechanical characteristics of the membrane supporting structures. In order to ensure the service life of the metal film component, the hydrogen film purifying equipment is provided with three states of starting, running and stopping, wherein the starting stage comprises vacuumizing, heating and pressure maintaining steps, the stopping stage comprises vacuumizing, nitrogen filling and other processes, the metal film is required to be insulated and crude hydrogen is required to be preheated during normal running, the whole process relates to the processes of vacuumizing, nitrogen filling, purging, hydrogen purification and the like, and in the related technology, the metal film purifying equipment is controlled by valves, so that the problems of complex control logic, large volume of gas path pipelines and valves, low response speed and the like exist. Disclosure of Invention The application provides a hydrogen membrane purification system based on a rotary valve control gas path. According to one aspect, the embodiment of the application provides a hydrogen membrane purification system based on a rotary valve control gas path, which comprises a membrane purifier, a rotary multi-way valve and a servo motor, wherein: the membrane purifier is divided into a tube side and a shell side, crude hydrogen is introduced into a tube side 1 interface of the membrane purifier in the operation process of the membrane purifier, product hydrogen permeates into a shell side 2 interface and a shell side 3 interface through a palladium metal membrane, residual tail gas output by the membrane purifier flows out of the other side interface tube side 4 of the tube side, and the tube side 1, the tube side 4, the shell side 2 and the shell side 3 interfaces are respectively connected into a rotary multi-way valve; The rotary multi-way valve block consists of a movable valve block and a static valve block, wherein one side of the static valve block is provided with a plurality of air paths, each air path comprises a product air outlet, a tail gas outlet, an evacuation outlet, a vacuumizing port, a nitrogen inlet and a crude hydrogen inlet air path, and pipelines 1,2,3 and 4 at the other side are respectively connected with interfaces of a tube side 1, a tube side 4, a shell side 2 and a shell side 3 of the membrane purifier, and the movable valve block is internally provided with a plurality of independent passages for connecting the plurality of air paths of the static valve block, the pipelines 1,2,3 and 4; the servo motor is connected with the rotary multi-way valve block and is used for controlling the rotation of the valve block so as to be communicated with a target outlet gas circuit and a target tube side and/or a target shell side interface which are required in the static valve block. In one embodiment of the application, the hydrogen membrane purification system based on the rotary valve control gas circuit further comprises a heater, wherein one end of the heater is connected with the tube side 1 of the membrane purifier in an interface manner, and is used for heating the crude hydrogen to a first set temperature threshold. In one embodiment of the application, the hydrogen membrane purification system based on the rotary valve control gas circuit further comprises a heat exchanger, wherein the heat exchanger adopts a three-channel heat exchanger, a first channel is connected with the other end of the heater, a second channel is connected with a tube side 4 interface, and the second channel is connected with a shell side 3 interface and is used for exchanging heat between product hydrogen and residual tail gas and crude hydrogen heated to a set temperature threshold value so as to improve heat utilization efficiency. In one embodiment of the application, when the rotary multi-way valve is in a nitrogen purging state, the movable valve plate is adjusted to be positioned at an angle of 0 degrees through the servo mo