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CN-224221266-U - Methanol water concentration proportioning system based on membrane permeation

CN224221266UCN 224221266 UCN224221266 UCN 224221266UCN-224221266-U

Abstract

The utility model discloses a methanol-water concentration proportioning system based on membrane permeation, which relates to the technical field of direct methanol fuel cells and comprises a membrane liquid mixing tank, wherein the membrane liquid mixing tank comprises a first end plate, a proton exchange membrane and a second end plate, a methanol cavity is arranged on the side surface of the first end plate, a water mixing cavity is arranged on the side surface of the second end plate, the proton exchange membrane is clamped between the first end plate and the second end plate, the proton exchange membrane separates the methanol cavity from the water mixing cavity at two sides, and methanol in the methanol cavity can permeate into the water mixing cavity through the proton exchange membrane. The utility model utilizes the mechanism that the proton exchange membrane allows methanol molecules to diffuse due to the hydrophilic channel, so that the methanol permeability is high, the inside of the membrane mixed liquid tank is divided into a methanol cavity and a mixed water cavity through the proton exchange membrane, part of methanol at the side of the methanol cavity permeates into the mixed water cavity through the proton exchange membrane, and the methanol is directly proportioned into the required methanol water concentration suitable for a direct methanol fuel cell, and the operation is simple, and the methanol water concentration is easy to control.

Inventors

  • CHEN GANG
  • Qiao Chuanbao
  • ZHOU XUAN

Assignees

  • 上海众氢新能源科技有限公司

Dates

Publication Date
20260512
Application Date
20250606

Claims (6)

  1. 1. The methanol water concentration proportioning system based on membrane permeation comprises a pure methanol storage tank (1), a pure water storage tank (2) and a methanol water storage tank (3), and is characterized by further comprising a membrane liquid mixing tank (4); The membrane liquid mixing tank (4) comprises a first end plate (41), a proton exchange membrane (42) and a second end plate (43), a methanol cavity (411) is formed in the side face of the first end plate (41), a water mixing cavity (431) is formed in the side face of the second end plate (43), the proton exchange membrane (42) is clamped between the first end plate (41) and the second end plate (43), the proton exchange membrane (42) separates the methanol cavity (411) from the water mixing cavity (431) at two sides, and methanol in the methanol cavity (411) can permeate into the water mixing cavity (431) through the proton exchange membrane (42); The two ends of the first end plate (41) are respectively provided with a methanol inlet and a methanol outlet which are communicated with the methanol cavity (411), the two ends of the second end plate (43) are respectively provided with a pure water inlet and a methanol water outlet which are communicated with the water mixing cavity (431), the outlet of the pure methanol storage tank (1) is connected with the methanol inlet of the first end plate (41), the inlet of the pure methanol storage tank (1) is connected with the methanol outlet of the first end plate (41), the outlet of the pure water storage tank (2) is connected with the pure water inlet of the second end plate (43), and the methanol water outlet of the second end plate (43) is connected with the inlet of the methanol water storage tank (3).
  2. 2. The methanol-water concentration proportioning system based on membrane permeation according to claim 1, wherein sealing grooves are formed in the side surfaces of the first end plate (41) and the second end plate (43), and sealing rings (5) are embedded in the sealing grooves.
  3. 3. The membrane permeation based methanol water concentration proportioning system of claim 2, wherein the first end plate (41) and the second end plate (43) are fastened and connected by a plurality of bolt assemblies (6).
  4. 4. The membrane permeation-based methanol-water concentration proportioning system according to claim 1, further comprising a direct methanol fuel cell (7), wherein an outlet of the methanol-water storage tank (3) is connected with a methanol-water inlet of the direct methanol fuel cell (7), and a methanol-water outlet of the direct methanol fuel cell (7) is connected with an inlet of the methanol-water storage tank (3).
  5. 5. The membrane permeation-based methanol-water concentration proportioning system of claim 4, further comprising a heat exchanger (8), wherein the heat exchanger (8) is provided with a methanol liquid inlet, a methanol liquid outlet, a water inlet and a water outlet, the water outlet of the direct methanol fuel cell (7) is connected with the water inlet of the heat exchanger (8), the water outlet of the heat exchanger (8) is connected with the inlet of the pure water storage tank (2), the outlet of the pure methanol storage tank (1) is connected with the methanol liquid inlet of the heat exchanger (8), and the methanol liquid outlet of the heat exchanger (8) is connected with the methanol inlet of the first end plate (41).
  6. 6. The membrane permeation-based methanol-water concentration proportioning system according to claim 1, wherein a methanol concentration sensor is arranged in the methanol-water storage tank (3).

Description

Methanol water concentration proportioning system based on membrane permeation Technical Field The utility model relates to the technical field of direct methanol fuel cells, in particular to a methanol water concentration proportioning system. Background The Direct Methanol Fuel Cell (DMFC) is a device which takes methanol aqueous solution as fuel and directly converts chemical energy into electric energy through electrochemical reaction, has the advantages of high energy density, easy storage of fuel, quick low-temperature start and the like, and is regarded as an ideal power supply of portable electronic equipment and a micro-energy system. The core reaction comprises anode reaction, wherein methanol and water are oxidized under the action of a catalyst to generate CO 2, protons and electrons, the reaction formula is CH 3OH+H2O→CO2 +6H++6e-, and cathode reaction, wherein oxygen, protons and electrons are combined to generate water, and the reaction formula is 3/2O 2+6H⁺+6e⁻→3H2 O. The fuel of the direct methanol fuel cell is applied to a methanol-water mixed solution, the concentration is usually 3% -5%, a fuel supply system of the direct methanol fuel cell in the prior art generally comprises a methanol tank, a water tank and a mixed liquid tank, pure methanol is input into the mixed liquid tank through a pump in the methanol tank, water is input into the mixed liquid tank through the pump in the water tank, and the mixed liquid tank is proportioned into a methanol-water solution with the concentration of 3% -5%, the fuel supply system has the defects that 1, the concentration of the methanol-water solution in the mixed liquid tank is not easy to control, 2, the continuous replenishment of the pure methanol from the methanol tank to the mixed liquid tank can have high requirement on the precision of the pump, and the price of the pump is high. The invention discloses a fuel automatic proportioning system of a methanol reforming hydrogen production device, which is disclosed in Chinese patent publication No. CN117654319A and comprises a pure methanol storage tank, a deionized water storage tank, a pure methanol buffer tank, a deionized water buffer tank and a methanol aqueous solution storage tank, wherein a liquid outlet of the pure methanol storage tank is connected with a liquid inlet of the pure methanol buffer tank through a diaphragm pump, an overflow hole of the pure methanol buffer tank is connected with a reflux port of the pure methanol storage tank, a liquid outlet of the pure methanol buffer tank is provided with an electromagnetic valve and is connected with the methanol aqueous solution storage tank, a liquid outlet of the deionized water storage tank is connected with a liquid inlet of the deionized water buffer tank through a diaphragm pump, an overflow hole of the deionized water buffer tank is connected with a reflux port of the deionized water storage tank, a liquid outlet of the deionized water buffer tank is provided with an electromagnetic valve and is connected with the methanol aqueous solution storage tank, and the weights of pure methanol and deionized water stored below the overflow holes of the two buffer tanks are equal. The concentration of the methanol aqueous solution is proportioned by using a pure methanol storage tank, a deionized water storage tank, a pure methanol buffer tank, a deionized water buffer tank and a methanol aqueous solution storage tank. Therefore, the solution preparation problem that the concentration of the methanol aqueous solution of the direct methanol fuel cell is easy to control is needed to be solved at present. Disclosure of Invention The utility model aims to overcome the defects in the prior art, and provides a methanol water concentration proportioning system based on membrane permeation. In order to achieve the above purpose, the utility model provides a methanol-water concentration proportioning system based on membrane permeation, which comprises a pure methanol storage tank, a pure water storage tank, a methanol-water storage tank and a diaphragm liquid mixing tank; the membrane liquid mixing tank comprises a first end plate, a proton exchange membrane and a second end plate, wherein a methanol cavity is arranged on the side face of the first end plate, a water mixing cavity is arranged on the side face of the second end plate, the proton exchange membrane is clamped between the first end plate and the second end plate, the proton exchange membrane separates the methanol cavity from the water mixing cavity on two sides, and methanol in the methanol cavity can permeate into the water mixing cavity through the proton exchange membrane and is mixed with pure water in the water mixing cavity; The two ends of the first end plate are respectively provided with a methanol inlet and a methanol outlet which are communicated with the methanol cavity, the two ends of the second end plate are respectively provided with a pure water inlet and a metha