阅读说明：本技术 一种氢燃料电池发动机的尾气排放装置 (Tail gas discharging device of hydrogen fuel cell engine ) 是由 张选高 高勇 徐增师 卢凯发 池飞飞 于 2021-08-09 设计创作，主要内容包括：本发明公开了一种氢燃料电池发动机的尾气排放装置,包括电子节气门、排气尾管、导流管、三元催化器、密封环、弹簧等,采用多功能一体化设计,具有将燃料电池发动机排放物集中排放、消除电堆泄漏的氢气与电化学反应残余的氢气、无需辅助电能实现电堆保护罩负压通风等功能,结构简单、适用性强、技术难度低、安装运输方便、制造和维护成本低,适于规模化生产。(The invention discloses a tail gas discharge device of a hydrogen fuel cell engine, which comprises an electronic throttle valve, an exhaust tail pipe, a flow guide pipe, a three-way catalyst, a sealing ring, a spring and the like, adopts a multifunctional integrated design, has the functions of intensively discharging the emissions of the fuel cell engine, eliminating hydrogen leaked by a galvanic pile and residual hydrogen generated by electrochemical reaction, realizing negative pressure ventilation of a galvanic pile protective cover without auxiliary electric energy and the like, has simple structure, strong applicability, low technical difficulty, convenient installation and transportation, low manufacturing and maintenance cost and is suitable for large-scale production.)

1. An exhaust emission device of a hydrogen fuel cell engine, comprising an electronic throttle valve (1) connected with an engine tail pipe (8), wherein the electronic throttle valve (1) and the tail pipe (8) are sealed by a sealing member (4), and the exhaust emission device is characterized in that: honeycomb duct (9) that the big export of import is installed to tail pipe (8) air inlet department, and air outlet department installs three way catalyst converter (7) in tail pipe (8), tail pipe (8) inner wall parallel arrangement have two protruding circles, and the type inslot between two protruding circles is fixed with sealing ring (5) through spring (6), sealing ring (5) hug closely honeycomb duct (9) outer wall face and form sealedly, tail pipe (8) on be provided with hydrogen side water interface and the hydrogen tail mouth that is located two protruding circles the place ahead, hydrogen side water interface and hydrogen tail mouth be located honeycomb duct (9) exit, insert the product water and the hydrogen that the pile discharged respectively, still be provided with the air inlet interface that is located two protruding circles rear on tail pipe (8) lateral wall, air inlet interface be located the cavity department that tail pipe (8), sealing ring (5) and honeycomb duct (9) formed, the air outlet is used for being connected into the pile protection cover to exhaust air.

2. The exhaust gas discharge device for a hydrogen fuel cell engine according to claim 1, wherein said electronic throttle valve (1) and tail pipe (8) are connected by means of a connector (2) and a fastener (3).

3. The exhaust emission device of a hydrogen fuel cell engine according to claim 1, wherein the spring (6) and the sealing ring (5) are arranged side by side in two convex rings to axially fix the sealing ring (5).

Technical Field

The invention belongs to the technical field of fuel cell engines, and particularly relates to a tail gas discharge device for a hydrogen fuel cell engine.

Background

A hydrogen fuel cell is a power generation device that directly converts chemical energy existing in a fuel and an oxidant into electric energy through an electrochemical reaction, and has the advantages of high energy conversion efficiency, high energy density, low vibration noise, zero emission, and the like. Therefore, the hydrogen fuel cell is regarded as a clean and efficient ideal power device in the 21 st century, is an important way for solving the two problems of resource shortage and pollution deterioration, and has wide development and application prospects in the fields of new energy automobiles and green ships.

The fuel cell galvanic pile can inevitably leak a small amount of hydrogen to the outside, the accumulation of hydrogen can arouse dangers such as fire, explosion, most existing technical scheme is to encapsulate the galvanic pile in the safety cover, adopt the mode of forced draft to dilute the hydrogen in the safety cover and release, hydrogen also needs certain tail to be discharged among the galvanic pile reaction process, inert gas and water in the hydrogen of taking away, galvanic pile hydrogen side also has partial formation water simultaneously, need outside emission after separating through the gas-water separator, residual air also needs to discharge after the galvanic pile air side electrochemical reaction. Most of the emission sources of the existing hydrogen fuel cell engine are directly emitted, in a narrow space or a space with poor ventilation, the released hydrogen can cause risks such as combustion and explosion, a pile protection cover is forced to ventilate through air inlet of a blower, certain electric energy can be consumed, and risks such as fan failure exist.

The integrated device of gas-liquid separator and diluter (application No. 200980156009.9) filed by toyota automotive co.ltd. proposes a device for mixing, diluting and discharging gas-liquid separator, air exhaust gas and hydrogen exhaust gas, and the structure thereof is mainly to mix, dilute and discharge the discharge.

The fuel cell automobile exhaust emission device and the fuel cell automobile (application number CN 210182493U) applied by Beijing New energy automobile technical innovation center Limited company provides an exhaust emission device, which mainly realizes gas-water separation, avoids water accumulation and avoids hydrogen leakage from a drainage hole.

A tail gas discharge device mainly utilizes a buffer device to temporarily collect and dilute mixed gas with overhigh concentration so as to ensure that the hydrogen content of finally discharged gas is always lower than an explosion limit.

The above-mentioned patent technical solution still cannot completely eliminate the residual leakage of hydrogen.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a tail gas exhaust device for a hydrogen fuel cell engine, so as to achieve the functions of concentrated exhaust of fuel cell engine emissions, elimination of residual hydrogen, negative pressure ventilation of a stack protection cover without auxiliary electric energy, and the like, and effectively ensure the safe operation of the fuel cell engine.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a tail gas discharging equipment of hydrogen fuel cell engine, includes the electronic air throttle that is connected with engine tail pipe for insert the pile residual gas of hydrogen fuel cell engine, it is sealed through the sealing member between the entry installation face of electronic air throttle and tail pipe, air inlet department installs the little honeycomb duct of the big export of import in the tail pipe, air outlet department installs the three way catalyst converter in the tail pipe, tail pipe inner wall parallel arrangement have two protruding circles, the inslot between two protruding circles is fixed with the sealing ring through the spring, the sealing ring hug closely the honeycomb duct outer wall and form sealedly, tail pipe lateral wall on be provided with hydrogen side water interface and hydrogen tail discharge opening that is located two protruding circles the place ahead, hydrogen side water interface and hydrogen tail discharge opening be located the honeycomb duct exit, connect into the product water and the hydrogen that the pile discharged respectively, still be provided with the air inlet interface that is located two protruding circles rear on the tail pipe lateral wall, the air inlet interface is positioned in a cavity formed by the exhaust tail pipe, the sealing ring and the flow guide pipe and used for being connected with the pile protection cover to exhaust air.

The electronic throttle valve and the tail pipe of the tail gas exhaust device of the hydrogen fuel cell engine are connected through a connecting piece and a fastening piece.

The spring and the sealing ring of the tail gas exhaust device of the hydrogen fuel cell engine are arranged in two convex rings side by side so as to realize the axial fixation of the sealing rings.

The invention has the beneficial effects that:

1) the invention adopts a multifunctional integrated design, and effectively discharges the emission of the fuel cell engine in a centralized way.

2) The invention adopts the principle of an ejector pump to realize unpowered negative pressure ventilation and purging of hydrogen leaked by the galvanic pile.

3) The invention adopts the mode that the three-way catalyst is additionally arranged on the tail pipe of the exhaust, so that the hydrogen leaked by the galvanic pile and the residual hydrogen generated by the electrochemical reaction are eliminated, and the safety of the fuel cell engine is improved.

4) The invention has simple structure, low technical difficulty, convenient installation and transportation, low manufacturing and maintenance cost and is suitable for large-scale production.

Drawings

FIG. 1 is an external structural view of the present invention;

FIG. 2 is a schematic view of the internal structure of the present invention;

FIG. 3 is a schematic view of the exhaust emission of the present invention.

The notation in the figure is: the device comprises an electronic throttle valve 1, a connecting piece 2, a fastening piece 3, a sealing piece 4, a sealing ring 5, a spring 6, a three-way catalyst 7, an exhaust tail pipe 8 and a guide pipe 9.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

The invention provides a tail gas discharge device of a hydrogen fuel cell engine, which has the functions of intensively discharging the emissions of the fuel cell engine, eliminating hydrogen leaked by a galvanic pile and residual hydrogen in an electrochemical reaction, carrying out negative pressure ventilation on a galvanic pile protection cover without auxiliary electric energy and the like, and is simple in structure, strong in applicability, low in technical difficulty, convenient to install and transport, low in manufacturing and maintenance cost and suitable for large-scale production.

Referring to fig. 1, 2 and 3, the invention discloses an exhaust emission device for a hydrogen fuel cell engine, which comprises an electronic throttle valve 1, an exhaust tail pipe 8, a guide pipe 9, a three-way catalyst 7, a sealing ring 5, a sealing element 4, a spring 6, a connecting piece 2 and a fastening piece 3.

The electronic throttle valve 1 and the tail pipe 8 are fixedly connected through a connecting piece 2 and a fastener 3, and the mounting surfaces of the electronic throttle valve 1 and the tail pipe 8 are sealed through a sealing piece 4; a guide pipe 9 with a large end and a small end and in a convergent-divergent nozzle shape is arranged at the air inlet side in the tail pipe 8, and a three-way catalyst 7 is arranged at the air outlet end in the tail pipe 8.

Two convex rings are arranged on the inner wall of the tail pipe 8, the sealing ring 5 and the spring 6 are arranged between the two convex rings on the inner wall of the tail pipe 8, and the spring 6 axially presses the sealing ring 5 to be tightly attached to the convex rings of the tail pipe 8 and the outer circle of the flow guide pipe 9 to form sealing.

The radial direction of the tail pipe 8 is provided with three connectors, wherein two connectors of a hydrogen side water connector and a hydrogen tail outlet are positioned above the nozzle outlet of the guide pipe 9, and one air outlet connector is positioned above a cavity formed by the tail pipe 8, the sealing ring 5 and the guide pipe 9.

The residual gas of the air outlet of the galvanic pile of the hydrogen fuel cell engine is connected with the inlet of the electronic throttle valve 1, the hydrogen discharged by the pulse of the galvanic pile of the hydrogen fuel cell engine is connected with a radial interface hydrogen tail outlet above the nozzle outlet of the draft tube 9, the water of the product on the hydrogen side of the galvanic pile of the hydrogen fuel cell engine is connected with another radial interface hydrogen side water interface above the nozzle outlet of the draft tube 9, and the air outlet of the protective cover of the galvanic pile is connected with an air outlet interface of a radial interface above a cavity formed by the sealing ring 5 and the draft tube 9 on the tail exhaust pipe 8.

The technical principle of the present invention will be explained below with reference to the structure of the present invention.

When the fuel cell engine does not work, the electronic throttle valve 1 is closed, no air flow passes through the tail gas discharge device, the sealing ring 5 is tightly attached to the boss of the tail gas exhaust pipe 8 and the outer circle of the flow guide pipe 9 under the compression of the spring 6 to form sealing, hydrogen discharged from the tail gas is prevented from flowing backwards to enter the electric pile sealing cover when the fuel cell engine does not work, and the electronic throttle valve 1 is completely closed to prevent the hydrogen discharged from the tail gas from flowing backwards to enter the air side of the electric pile.

When the fuel cell engine works, the electronic throttle valve 1 is opened to a certain opening degree, residual gas at an air outlet of the fuel cell stack passes through the flow guide pipe 9 in the exhaust tail pipe 8 at a high speed, the adjustable opening degree of the electronic throttle valve 1 and gas resistance generated by a contraction-shaped nozzle of the flow guide pipe 9 form ejection negative pressure (back pressure) on the air side of the fuel cell in the area near the nozzle outlet of the flow guide pipe 9, the pressure of electrochemical reaction gas of the fuel cell stack is increased, the sealing ring 5 overcomes the compression force of the spring 6, the sealing cavity is opened, the flow guide pipe 9 sucks the fuel cell stack sealing cover through a radial interface on the excircle, negative pressure ventilation blowing to the fuel cell stack sealing cover is formed, and the electrical property of the fuel cell is improved.

When the fuel cell engine works, the fuel cell engine discharges hydrogen into an exhaust tail pipe 8 in a periodic pulse mode, the hydrogen concentration is rapidly reduced to be below an explosion limit under the sweeping and dilution of enough air reaction residual gas of the electric pile, the hydrogen reacts with oxygen in the air residual gas of the electric pile under the action of a three-way catalytic converter 7 at an outlet, only nitrogen, residual oxygen and water are left in the discharged tail gas, and zero pollutant discharge is really realized. The product water on the hydrogen side of the galvanic pile is connected into the tail pipe 8 and is discharged together with the tail gas.

The above-described embodiments are merely illustrative of the principles and effects of the present invention, and some embodiments may be applied, and it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the inventive concept of the present invention, and these embodiments are within the scope of the present invention.