CN116219464A - An ammonia plant tail gas synthesis and reuse device based on integrated proton exchange membrane electrolyzer and Fischer-Tropsch synthesis - Google Patents

Abstract

The invention discloses an ammonia plant tail gas synthesis and recycling device based on integrated proton exchange membrane electrolysis bath and Fischer-Tropsch synthesis, which comprises a tubular proton exchange membrane electrolysis bath, a tubular Fischer-Tropsch reactor, wind power generation equipment and gas pretreatment equipment, wherein the gas pretreatment equipment is connected with the tubular proton exchange membrane electrolysis bath, the tubular proton exchange membrane electrolysis bath is integrally connected with the tubular Fischer-Tropsch reactor, and the wind power generation equipment for providing electric energy is respectively connected with the tubular proton exchange membrane electrolysis bath and the tubular Fischer-Tropsch reactor. The invention combines the electrolysis of water by a proton exchange membrane electrolyzer as a hydrogen source with the purification treatment of carbon monoxide tail gas of an ammonia production plant and the reproduction of available fuels such as methane, is suitable for large, medium and small ammonia production plants, and carries out high-efficiency purification treatment of tail gas and the reproduction of industrial fuels such as methane by the capability of electrolysis of water and Fischer-Tropsch synthesis.

Description

An ammonia plant tail gas based on integrated proton exchange membrane electrolyzer and Fischer-Tropsch synthesis Synthetic reuse device

technical field

The invention belongs to the technical field of energy utilization, and in particular relates to an ammonia plant tail gas synthesis and reuse device based on an integrated proton exchange membrane electrolyzer and Fischer-Tropsch synthesis.

Background technique

Today's chemical industry still relies heavily on the combustion of fossil fuels to manufacture commercial chemicals and as the main energy source, and a large amount of carbon monoxide and other gases produced during the production process will cause serious harm to the environment if they are directly discharged into the atmosphere without treatment. On the one hand, it is necessary to reduce the use of fossil fuels, and on the other hand, it is necessary to strengthen the treatment and even recycling of harmful gases generated in the production process of chemical products. Fischer-Tropsch synthesis uses syngas (H ₂ and CO) as raw materials to directly convert other value-added chemicals, so it can use a large amount of carbon monoxide in the tail gas of ammonia plants combined with hydrogen produced by electrolysis of water in proton exchange membrane electrolyzers for Fischer-Tropsch synthesis Synthesis reactions, and liquid fuels produced by Fischer-Tropsch synthesis are also expected to play an important role in meeting the long-term need for a reliable source of alternative liquid transportation fuels.

Traditional Fischer-Tropsch synthesis is powered by fossil fuel combustion, and cheap coal resources are used as raw materials. This runs counter to us in reducing the use of fossil fuels. Therefore, it is particularly important to combine more environmentally friendly energy supply methods with Fischer-Tropsch. Although wind energy accounts for a very small amount of world energy production, it has made outstanding contributions in reducing the consumption of fossil fuels and reducing greenhouse gas emissions. Therefore, wind power generation technology has received more and more attention, and wind power generation technology is also rapidly development and deployment. Therefore, the effective combination of Fischer-Tropsch synthesis and wind power generation technology will also provide a better choice for protecting the environment.

Contents of the invention

In view of the above-mentioned problems in the prior art, the object of the present invention is to provide an ammonia plant tail gas synthesis and reuse device based on integrated proton exchange membrane electrolyzer and Fischer-Tropsch synthesis.

The specific technical solutions are:

An ammonia plant tail gas synthesis and reuse device based on integrated proton exchange membrane electrolyzer and Fischer-Tropsch synthesis, including tubular proton exchange membrane electrolyzer, tubular Fischer-Tropsch reactor, wind power generation equipment and gas pretreatment equipment, gas The pretreatment equipment is connected to the tubular proton exchange membrane electrolyzer, the tubular proton exchange membrane electrolyzer is integrated with the tubular Fischer-Tropsch reactor, and the wind power generation equipment used to provide electric energy is respectively connected to the tubular proton exchange membrane electrolyzer.

Further, the wind power generation equipment includes an asynchronous wind generator and a storage battery. The asynchronous wind generator is connected to a tubular proton exchange membrane electrolyzer. Convert wind energy into mechanical energy, and then convert mechanical energy into electrical energy. While supplying power to the tubular proton exchange membrane electrolyzer, the excess electricity is stored in the battery as a backup power supply in case of insufficient wind power.

Further, the tubular proton exchange membrane electrolyzer comprises a proton exchange membrane electrolyzer cathode, a proton exchange membrane electrolyzer anode and a proton exchange membrane layer, and the proton exchange membrane layer is located between the proton exchange membrane electrolyzer cathode and the proton exchange membrane electrolyzer anode , water vapor produces hydrogen in the proton exchange membrane electrolyzer, and then the hydrogen and carbon monoxide are circulated to the second half of the Fischer-Tropsch reactor for Fischer-Tropsch reaction to generate methane and other industrial fuels.

Further, the gas pretreatment equipment includes a tubular heat exchanger, a gas mixer and a compressor, the tubular heat exchanger is connected to the gas mixer and the compressor in turn, and the compressor is connected to the tubular proton exchange membrane electrolyzer, The tubular heat exchanger exchanges heat between the high-temperature carbon monoxide in the exhaust gas of the ammonia plant and water. After the heat exchange, the water vapor and carbon monoxide gas are mixed in a gas mixer, and the mixed gas formed by carbon monoxide and water vapor is pressurized by a compressor. After reaching the pressure required for the reaction in the subsequent reactor, it is finally passed into the integrated tubular proton exchange membrane electrolyzer and tubular Fischer-Tropsch reactor.

The beneficial effect of the present invention is that: the integrated tubular proton exchange membrane electrolyzer and Fischer-Tropsch reactor designed by the device are simpler to operate than non-integrated, easy to carry, easier to disassemble and easy to control, and are suitable for Tail gas treatment of small and medium-sized water gas ammonia plants.

Description of drawings

Fig. 1 is a schematic flow sheet of the present invention;

Fig. 2 is a schematic diagram of the integrated proton exchange membrane electrolyzer and Fischer-Tropsch synthesis device of the present invention.

In the figure: 1. Tubular proton membrane electrolyzer; 2. Tubular Fischer-Tropsch reactor; 3. Asynchronous wind generator; 4. Battery; 5. Proton exchange membrane electrolyzer cathode; 6. Proton exchange membrane electrolyzer anode; 7. Proton exchange membrane layer; 8. Tube heat exchanger; 9. Gas mixer; 10. Compressor.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited thereto.

As shown in Figure 2, the tubular proton exchange membrane electrolyzer 1 is integrally connected with the tubular Fischer-Tropsch reactor 2, and the tubular proton exchange membrane electrolyzer 1 includes the cathode 5 of the proton exchange membrane electrolyzer and the anode 6 of the proton exchange membrane electrolyzer And the proton exchange membrane layer 7, the proton exchange membrane layer 7 is located between the cathode 5 of the proton exchange membrane electrolyzer and the anode 6 of the proton exchange membrane electrolyzer, water vapor is electrolyzed in the tubular proton exchange membrane electrolyzer 1 to generate hydrogen, and then the hydrogen is The Fischer-Tropsch reaction with carbon monoxide flows to the second half of the tubular Fischer-Tropsch reactor to generate methane and other industrial fuels.

As shown in Figure 1, an ammonia plant tail gas synthesis and reuse device based on integrated proton exchange membrane electrolyzer and Fischer-Tropsch synthesis, including tubular proton membrane electrolyzer 1, tubular Fischer-Tropsch reactor 2, asynchronous wind power generation Machine 3, battery 4, tubular heat exchanger 8, gas mixer 9 and compressor 10, tubular heat exchanger 8 is connected to gas mixer 9 and compressor 10 in turn, and the outlet of compressor 10 is connected to tubular proton membrane electrolysis Tank 1, asynchronous wind generator 3 are connected to tubular proton membrane electrolyzer 1, asynchronous wind generator 3 is connected to battery 4 in a cycle, and tubular heat exchanger 8 exchanges heat between high-temperature carbon monoxide in the tail gas of the ammonia plant and water, and heat exchange The final water vapor and carbon monoxide gas are passed into the gas mixer 9 for mixing, and the mixer formed by carbon monoxide and water vapor is passed into the compressor for pressurization to reach the pressure required for the reaction in the follow-up reactor, and then the water vapor enters the tubular The proton exchange electrolytic membrane 1 is electrolyzed, and the asynchronous wind generator 3 converts the wind energy into mechanical energy through wind power, and then converts the mechanical energy into electrical energy. Use in case of shortage.

Claims (4)

1. The ammonia plant tail gas synthesis and recycling device based on integrated proton exchange membrane electrolysis bath and Fischer-Tropsch synthesis is characterized by comprising a tubular proton exchange membrane electrolysis bath (1), a tubular Fischer-Tropsch reactor (2), wind power generation equipment and gas pretreatment equipment, wherein the gas pretreatment equipment is connected with the tubular proton exchange membrane electrolysis bath (1), the tubular proton exchange membrane electrolysis bath (1) is integrally connected with the tubular Fischer-Tropsch reactor (2), and the wind power generation equipment for providing electric energy is connected with the tubular proton exchange membrane electrolysis bath (1).

2. The ammonia plant tail gas synthesis and reuse device based on integrated proton exchange membrane electrolysis bath and Fischer-Tropsch synthesis as claimed in claim 1, wherein the wind power generation equipment comprises an asynchronous wind power generator (3) and a storage battery (4), the asynchronous wind power generator (3) is connected with the tubular proton exchange membrane electrolysis bath (1), and the asynchronous wind power generator (3) is circularly connected with the storage battery (4) for storing redundant electric energy.

3. The ammonia plant tail gas synthesis and reuse device based on integrated proton exchange membrane electrolysis bath and Fischer-Tropsch synthesis as claimed in claim 2, wherein the tubular proton exchange membrane electrolysis bath (1) comprises a proton exchange membrane electrolysis bath cathode (5), a proton exchange membrane electrolysis bath anode (6) and a proton exchange membrane layer (7), and the proton exchange membrane layer (7) is positioned between the proton exchange membrane electrolysis bath cathode (5) and the proton exchange membrane electrolysis bath anode (6).

4. The ammonia plant tail gas synthesis and recycling device based on integrated proton exchange membrane electrolysis bath and Fischer-Tropsch synthesis as claimed in claim 1, wherein the gas pretreatment equipment comprises a tubular heat exchanger (8), a gas mixer (9) and a compressor (10), the tubular heat exchanger (8) is sequentially connected with the gas mixer (9) and the compressor (10), and the compressor (10) is connected with the tubular proton exchange membrane electrolysis bath (1).

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