CN214031729U

CN214031729U - Low-temperature plasma-assisted catalytic waste gas-fuel reforming hydrogen production device

Info

Publication number: CN214031729U
Application number: CN202022698941.0U
Authority: CN
Inventors: 张尊华; 钱航; 李格升; 龙焱祥; 黄勇
Original assignee: Wuhan University of Technology WUT
Current assignee: Wuhan University of Technology WUT
Priority date: 2020-11-19
Filing date: 2020-11-19
Publication date: 2021-08-24
Anticipated expiration: 2030-11-19

Abstract

The utility model discloses a low-temperature plasma assisted catalytic waste gas-fuel reforming hydrogen production device, which comprises a shell, two metal fixing frames and a wire mesh. The casing is provided with air inlet and gas outlet, and the outer wall of casing is provided with the circular telegram subassembly, and the metal fixing frame encloses with the casing to close and forms and hold the chamber, holds the chamber and includes central part and outer loop portion, and wire mesh sets up to the piece of buckling, and some wire mesh are located the central part, and all the other wire mesh are located outer loop portion, are located the wire mesh of central part and are provided with the catalyst. The energizing assembly is capable of ionizing the gas around the pointed section of the wire mesh, thereby generating a plasma. The catalyst and the plasma are in the same space, substances are ionized and then undergo chemical reaction on the catalyst immediately, the selectivity of the catalytic reaction is improved by adopting a mode of coupling the built-in plasma and the catalyst, and the pressure drop along the process is greatly reduced by adopting a mode of coating the catalyst by using a wire mesh, thereby being beneficial to the transportation of the hydrogen-rich mixed gas.

Description

Low-temperature plasma-assisted catalytic waste gas-fuel reforming hydrogen production device

Technical Field

The utility model relates to a fuel reforming technology field, in particular to a waste gas-fuel reforming hydrogen production device of low-temperature plasma auxiliary catalysis.

Background

The natural gas engine is easy to extinguish when in lean combustion, and the content of nitrogen oxides in tail gas is high. Studies have shown that hydrogen-blended combustion in natural gas engines can improve the combustion and emissions characteristics of the engine. But there are currently major difficulties in the storage and transportation of hydrogen. The natural gas engine can realize on-line hydrogen-doped combustion by an exhaust-gas-fuel reforming recycling technology. The exhaust-fuel reforming and recycling technology divides the engine exhaust into two parts, one part of the exhaust and the fuel are subjected to reforming reaction in the reformer to generate a hydrogen-rich mixed gas, the other part of the exhaust provides heat required by the reaction outside the reforming pipe, and then the hydrogen-rich mixed gas generated by reforming is circularly led into the engine cylinder to be combusted. Most of the currently used exhaust gas-fuel reformers are fixed bed reactors formed by randomly stacking porous catalyst particles. The pressure drop generated when the exhaust gas and the fuel are subjected to reforming reaction in the reformer is large, so that the mixed gas is not favorably fed into an engine cylinder; and the selectivity of hydrogen in the reforming process is not high enough, so that the hydrogen doping amount in the engine is low.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a supplementary catalytic waste gas-fuel reforming hydrogen plant of low temperature plasma is convenient for reduce the pressure drop among the reforming reaction process, improves hydrogen selectivity.

The utility model adopts the technical proposal that: a low-temperature plasma-assisted catalytic exhaust-fuel reforming hydrogen production device comprises:

the air conditioner comprises a shell, a fan and a control device, wherein the shell is provided with an air inlet and an air outlet, and the outer wall of the shell is provided with an electrifying assembly;

the two metal fixing frames are respectively and fixedly connected to the air inlet and the air outlet, the metal fixing frames and the shell are enclosed to form an accommodating cavity, and the accommodating cavity comprises a central part and an outer ring part; and

the metal wire mesh is arranged as a bending piece, part of the metal wire mesh is positioned in the central part, the rest of the metal wire mesh is positioned in the outer ring part, a catalyst is arranged on the metal wire mesh positioned in the central part, and two ends of the metal wire mesh are fixedly connected with the two metal fixing frames respectively.

Has the advantages that: the low-temperature plasma-assisted catalytic waste gas-fuel reforming hydrogen production device is connected with an electrifying assembly through the outer side of a shell to generate plasma, meanwhile, a catalyst is arranged on a metal wire mesh positioned in the center of an accommodating cavity, the catalyst and the plasma are in the same space, substances are ionized and then undergo chemical reaction on the catalyst immediately, the selectivity of catalytic reaction is improved by adopting a mode of coupling the built-in plasma and the catalyst, the pressure drop along the process is greatly reduced by adopting a mode of coating the catalyst on the metal wire mesh, and the transportation of hydrogen-rich mixed gas is facilitated.

Further, the powered assembly includes a conductive metal mesh and a power source.

Further, the power supply is a high-voltage alternating current power supply.

Further, the number of the metal wire meshes is three, and the three metal wire meshes are arranged at intervals.

Further, the shell is made of an insulating material.

Further, the insulating material is quartz.

Further, the low-temperature plasma-assisted catalytic waste gas-fuel reforming hydrogen production device further comprises an air inlet pipeline and an air outlet pipeline, wherein the air inlet pipeline is communicated with the air inlet, and the air outlet pipeline is communicated with the air outlet.

Drawings

The invention will be further described with reference to the following figures and examples:

fig. 1 is a schematic diagram of device connection according to an embodiment of the present invention.

Detailed Description

This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Referring to fig. 1, an embodiment of the present invention provides a low-temperature plasma assisted catalytic exhaust gas-fuel reforming hydrogen production apparatus, which mainly comprises a casing 1, two metal fixing frames 2 and a wire mesh 3. This casing 1 is provided with air inlet and gas outlet, and the outer wall of this casing 1 is provided with the circular telegram subassembly, and two metal mount 2 are fixed connection respectively in air inlet and gas outlet department, leave the space of admitting air and giving vent to anger between two metal mount 2 and air inlet and the gas outlet, perhaps all seted up the air vent on these two metal mount 2 for let in and discharge gas. This circular telegram subassembly covers the outer wall at casing 1, this metal fixing frame 2 encloses with casing 1 and closes to form and holds the chamber, should hold the chamber and include central part and outer loop portion, this wire mesh 3 sets up to the piece of buckling, partial wire mesh 3 is located this central part, remaining wire mesh 3 is located this outer loop portion, be provided with the catalyst on the wire mesh 3 that is located the central part, this wire mesh 3's both ends respectively with the inboard fixed connection of two metal fixing frames 2, because wire mesh 3 sets up to the piece of buckling, consequently, the wire mesh 3 that is located the outer loop portion is the tip section. The energising assembly is capable of ionising gas around the pointed section of the wire mesh 3 to generate a plasma, and the energising assembly forms a closed loop with the plasma. Meanwhile, the metal wire mesh 3 positioned in the center of the accommodating cavity is provided with the catalyst, the catalyst and the plasma are in the same space, substances are ionized and then undergo chemical reaction on the catalyst immediately, the selectivity of catalytic reaction is improved by adopting a mode of coupling the built-in plasma and the catalyst, and the form of coating the metal wire mesh 3 with the catalyst is adopted, so that the on-way pressure drop is greatly reduced, and the transportation of the hydrogen-rich mixed gas is facilitated.

Preferably, the energizing assembly comprises a conductive metal mesh 4 and a power source. Specifically, the housing 1 of the low-temperature plasma assisted catalytic exhaust gas-fuel reforming hydrogen production device is square, the wire mesh 3 is vertically placed, and the pointed end section of the wire mesh 3 is arranged in the vertical direction. The conductive metal nets 4 are fixed on the upper end face and the lower end face of the shell 1, the conductive metal nets 4 on the upper end face and the lower end face are respectively connected with two poles of a power supply and serve as discharge electrodes, the conductive metal nets 4 on the lower end face are grounded to ensure safety, and the power supply, the plasma and the conductive metal nets 4 on the upper end face and the lower end face form a power-on loop.

Preferably, the power supply is a high voltage ac power supply 5. Specifically, the power supply adopts a narrow pulse high-voltage power supply, electrons are accelerated to high-energy electrons in an extremely short pulse time, and other ions with larger mass are not accelerated in time and basically keep static due to inertia action at the pulse moment. Therefore, the energy provided by the discharge is mainly used for generating high-energy electrons, and the energy efficiency is higher.

Preferably, three wires 3 are provided to the wire-net 3, and the three wires 3 are spaced apart from each other. Specifically, this wire mesh 3 includes first silk screen, second silk screen and third silk screen, installs from last to down in proper order, and this second silk screen is located this central part that holds the chamber completely, and the upper end tip section of this first silk screen and the lower extreme tip section of third silk screen are located this outer loop portion that holds the chamber, thereby it produces plasma to be convenient for realize corona discharge.

Preferably, the housing 1 is made of an insulating material, and the housing 1 made of the insulating material serves as an insulating medium. The insulating medium plays a role in energy storage in the discharging process, so that the discharging is stable, and the generation of spark discharging is further inhibited. Meanwhile, the existence of the insulating medium also plays a role in ballasting discharge, so that the discharge is uniformly distributed in the whole discharge space, and stable and uniform plasma is generated.

Preferably, the insulating material is quartz.

Preferably, the low-temperature plasma-assisted catalytic hydrogen production device by reforming exhaust gas-fuel further comprises an air inlet pipeline 6 and an air outlet pipeline 7, wherein the air inlet pipeline 6 is communicated with the air inlet, and the air outlet pipeline 7 is communicated with the air outlet. Specifically, the metal fixing frame 2 is provided with a vent hole for introducing and discharging gas.

The utility model provides a preferred embodiment. Specifically, the shell 1 is formed by bonding a quartz plate and a high-temperature-resistant adhesive, square holes are formed in the left end face and the right end face of the shell 1, a square metal fixing frame 2, a metal wire mesh 3 coated with a catalyst and a tip section are exposed, but the rest part of the metal wire mesh 3 coated with the catalyst is fixed through welding, the square metal fixing frame 2 is placed in grooves in the left end face and the right end face of the shell 1, an air inlet pipeline 6 is connected with the left end face of the shell 1 through a square flange, an air outlet pipeline 7 is connected with the right end face of the shell 1 through a square flange, conductive metal meshes 4 are arranged on the upper end face and the lower end face of the shell 1, the conductive metal meshes 4 on the upper end face and the lower end face are respectively connected with a high-voltage alternating-current power supply 5, and form a closed loop with plasma in a containing cavity. When the mixed gas of the exhaust gas and the fuel flows in from the air inlet pipe 6, the high-voltage alternating current power supply 5 discharges through the conductive metal mesh 4, the upper end surface and the lower end surface of the shell 1 serve as a barrier medium, the tip section is exposed, but the rest part of the catalyst-coated metal mesh 3 generates corona discharge at the tip section, the mixed gas is ionized, plasma is generated, the ionized mixed gas generates a hydrogen-rich mixed gas through a reforming reaction on the surface of the catalyst-coated metal mesh 3, and then the mixed gas flows into the engine cylinder through the air outlet pipe 7. The low-temperature plasma-assisted catalytic waste gas-fuel reforming hydrogen production device improves the selectivity of hydrogen production reaction and reduces the on-way pressure drop.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims

1. A low-temperature plasma-assisted catalytic waste gas-fuel reforming hydrogen production device is characterized by comprising:

2. The low-temperature plasma-assisted catalytic exhaust-fuel reforming hydrogen production apparatus according to claim 1, characterized in that: the powered assembly includes a conductive metal mesh and a power source.

3. The low-temperature plasma-assisted catalytic exhaust-fuel reforming hydrogen production apparatus according to claim 2, characterized in that: the power supply is a high-voltage alternating current power supply.

4. The low-temperature plasma-assisted catalytic exhaust-fuel reforming hydrogen production apparatus according to claim 1, characterized in that: the metal wire mesh is provided with three, three metal wire mesh intervals set up.

5. The low-temperature plasma-assisted catalytic exhaust-fuel reforming hydrogen production apparatus according to claim 1, characterized in that: the shell is made of an insulating material.

6. The low-temperature plasma-assisted catalytic exhaust-fuel reforming hydrogen production apparatus according to claim 5, characterized in that: the insulating material is quartz.

7. The low-temperature plasma-assisted catalytic exhaust-fuel reforming hydrogen production apparatus according to any one of claims 1 to 6, characterized in that: the low-temperature plasma assisted catalytic waste gas-fuel reforming hydrogen production device further comprises an air inlet pipeline and an air outlet pipeline, wherein the air inlet pipeline is communicated with the air inlet, and the air outlet pipeline is communicated with the air outlet.