CN100517405C - Fuel cell electricity-generating system hydrogen alarming device with CAN interface - Google Patents
Fuel cell electricity-generating system hydrogen alarming device with CAN interface Download PDFInfo
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- CN100517405C CN100517405C CNB2005100284076A CN200510028407A CN100517405C CN 100517405 C CN100517405 C CN 100517405C CN B2005100284076 A CNB2005100284076 A CN B2005100284076A CN 200510028407 A CN200510028407 A CN 200510028407A CN 100517405 C CN100517405 C CN 100517405C
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Abstract
The related H2 alarming device with CAN interface for power generating system of fuel cell comprises: a H2 detection alarm device with CAN interface, a controller, a H2 solenoid valve, and a H2-sensitive element. Compared with prior art, this invention has more security.
Description
Technical field
The present invention relates to fuel cell, relate in particular to the fuel cell electricity-generating system hydrogen alarming device of a kind of CAN of having interface of fuel.
Background technology
Electrochemical fuel cell is a kind of device that hydrogen and oxygenant can be changed into electric energy and reaction product.The internal core parts of this device are membrane electrode (Membrane Electrode Assembly are called for short MEA), and membrane electrode (MEA) is made up of as carbon paper a PEM, two porous conductive materials of film two sides folder.The catalyzer that contains the initiation electrochemical reaction of even tiny dispersion on two boundary surfaces of film and carbon paper is as the metal platinum catalyzer.The membrane electrode both sides can galvanochemistry will take place with conductive body to be sent out and answers the electronics that generates in the process, draws by external circuit, constitutes current return.
At the anode tap of membrane electrode, fuel can pass poriness diffusion material (carbon paper) by infiltration, and electrochemical reaction takes place on catalyst surface, lose electronics, form positive ion, positive ion can pass PEM by migration, arrives the other end cathode terminal of membrane electrode.At the cathode terminal of membrane electrode, contain the gas of oxygenant (as oxygen), as air, pass poriness diffusion material (carbon paper), and the generation electrochemical reaction obtains electronics on catalyst surface, forms negative ion by infiltration.The positive ion of coming in the negative ion and the anode tap migration of cathode terminal formation reacts, and forms reaction product.
Adopting hydrogen is fuel, and the air that contains oxygen is in the Proton Exchange Membrane Fuel Cells of oxygenant (or pure oxygen is an oxygenant), and fuel hydrogen has just produced hydrogen positive ion (or being proton) in the catalytic electrochemical reaction of anodic site.PEM helps the hydrogen positive ion to move to the cathodic area from the anodic site.In addition, PEM is separated the air-flow and the oxygen containing air-flow of hydrogen fuel, they can not mixed mutually and produces explosion type reaction.
In the cathodic area, oxygen obtains electronics on catalyst surface, forms negative ion, and moves the hydrogen positive ion reaction of coming, reaction of formation product water with the anodic site.In the Proton Exchange Membrane Fuel Cells that adopts hydrogen, air (oxygen), anode reaction and cathode reaction can be expressed in order to following equation:
Anode reaction: H
2→ 2H
++ 2e
Cathode reaction: 1/2O
2+ 2H
++ 2e → H
2O
In typical Proton Exchange Membrane Fuel Cells, membrane electrode (MEA) generally all is placed in the middle of the pole plate of two conductions, and quarter is milled by die casting, punching press or machinery in the surface that every guide plate contacts with membrane electrode, and formation is the diversion trench of one or more at least.These guide plates can above metal material pole plate, also can be the pole plate of graphite material.Fluid duct on these guide plates and diversion trench import fuel and oxygenant the anodic site and the cathodic area on membrane electrode both sides respectively.In the structure of a Proton Exchange Membrane Fuel Cells monocell, only there is a membrane electrode, the membrane electrode both sides are respectively the fair water fin of anode fuel and the fair water fin of cathode oxidant.These fair water fins are both as current collector plate, and also as the mechanical support on membrane electrode both sides, the diversion trench on the fair water fin acts as a fuel again and enters the passage of anode, cathode surface with oxygenant, and as the passage of taking away the water that generates in the fuel cell operation process.
In order to increase the general power of whole Proton Exchange Membrane Fuel Cells, two or more monocells can be connected into electric battery or be unified into electric battery by the mode that tiles usually by straight folded mode.In straight folded, in-line electric battery, can there be diversion trench on the two sides of a pole plate, and wherein one side can be used as the anode guide face of a membrane electrode, and another side can be used as the cathode diversion face of another adjacent membranes electrode, and this pole plate is called bipolar plates.A series of monocell connects together by certain way and forms an electric battery.Electric battery tightens together by front end-plate, end plate and pull bar usually and becomes one.
A typical battery stack generally includes: the water conservancy diversion import and the flow-guiding channel of (1) fuel and oxidant gas are distributed to fuel (hydrogen-rich gas that obtains as hydrogen, methyl alcohol or methyl alcohol, rock gas, gasoline) and oxygenant (mainly being oxygen or air) in the diversion trench of each anode, cathode plane equably after reforming; (2) import and export and the flow-guiding channel of cooling fluid (as water) are evenly distributed to cooling fluid in each electric battery inner cooling channel, and the thermal absorption that hydrogen in the fuel cell, the themopositive reaction of oxygen galvanochemistry are generated is also taken electric battery out of and dispelled the heat; (3) outlet of fuel and oxidant gas and corresponding flow-guiding channel, fuel gas and oxidant gas are when discharging, and portability goes out the liquid that generates in the fuel cell, the water of steam state.Usually, the import and export of all fuel, oxygenant, cooling fluid are all opened on the end plate of fuel cell group or on two end plates.
Proton Exchange Membrane Fuel Cells both can be used as the power system of delivery vehicles such as car, ship, can be used as movable type or stationary power generation system again.
Proton Exchange Membrane Fuel Cells generally is made up of several monocells, these monocells are coupled together the formation pem fuel cell stack in the mode of serial or parallel connection, and pem fuel cell stack and other operation back-up systems are combined constitutes whole Proton Exchange Membrane Fuel Cells electricity generation system.
Fuel cell generation is that to adopt hydrogen be the novel energy that raw material generates electricity, and has characteristics such as pollution-free, the high and low noise of conversion usefulness, cold operation. have a wide range of applications.But the raw material-hydrogen of fuel cell is a kind of inflammable, explosive gas, for fuel cell generation can long-term safety be moved reliably, must carry out the detection of hydrogen gas leakage to fuel cell generation, when detecting hydrogen gas leakage, in time report to the police and the cut-out sources of hydrogen.
Hydrogen-sensitive element is generally adopted in detection to hydrogen, the principle of hydrogen-sensitive element measurement gas component content is: when tested hydrogen during by hydrogen-sensitive element surperficial, chemical reaction can take place, make the resistance of its inner metal oxide that variation take place, and the size of its resistance and linear substantially by the density of hydrogen on its surface.Therefore, as long as convert changes in resistance to change in voltage, measure voltage signal and just can calculate corresponding density of hydrogen.
Consult Fig. 1.Fig. 1 is the hydrogen-sensitive element wiring schematic diagram.Among Fig. 1, the 1st, hydrogen-sensitive element, the 2nd, pull-up resistor R.VC is an operating voltage, and VH is a heating voltage, and VO is an output voltage.
Hydrogen alarm circuit commonly used now has two kinds, a kind of employing mimic channel, it is connected to output voltage VO in the dc bridge circuit, and output voltage VO just can increase after hydrogen-sensitive element detects hydrogen, mimic channel indicates the variation of VO with voltage table, and sends sound and light alarm.The advantage of mimic channel is not need working procedure, and antijamming capability is strong, and shortcoming is the circuit complexity, and precision is low.Another kind of alarm circuit is to adopt the band microprocessor circuit, and its principle is that the variation with VO converts digital signal to by A/D and handles for CPU.CPU carries out linearization process and carries out temperature compensation it by the operating software algorithm.By opening or closing of I/O mouth guide sound light crossing-signal.Adopt the characteristics of microcontroller circuit to be: circuit is simple, the precision height.
But, more than two kinds of circuit all can only the leakage of hydrogen be detected and report to the police, and operating personnel's manually-operated is still wanted in the work of closing sources of hydrogen after reporting to the police, and in processing time that like this can the delay accident, causes security incident.
Summary of the invention
Purpose of the present invention is exactly the fuel cell electricity-generating system hydrogen alarming device that a kind of CAN of having interface is provided for the defective that overcomes above-mentioned prior art existence.
Purpose of the present invention can be achieved through the following technical solutions: a kind of fuel cell electricity-generating system hydrogen alarming device of the CAN of having interface, comprise fuel cell generation, hydrogen detection alarm device, controller, hydrogen solenoid valve and hydrogen-sensitive element, it is characterized in that described hydrogen detection alarm device has the CAN communication interface.
Described hydrogen detection alarm device comprises CPU, photoisolator, solid-state relay, two-way CAN transceiver, audible-visual annunciator and power supply.
Described hydrogen-sensitive element and hydrogen detection alarm device are electrically connected, the electric signal of detected reflection density of hydrogen is delivered to hydrogen detection alarm device, hydrogen detection alarm device is connected by two-way CAN bus with controller, warning message is sent to controller, controller and hydrogen solenoid valve are electrically connected, opening or closing of control hydrogen solenoid valve, the hydrogen solenoid valve is connected with fuel cell generation, and control is to the hydrogen supply of fuel cell generation.
Described power supply is connected with CPU, CPU is provided operating voltage, and photoisolator is a two-way, and photoisolator one end is connected with CPU, one end is connected with the CAN transceiver, as the spacer assembly between CPU and the CAN transceiver, the CAN transceiver adopts two-way, is connected communication with controller, solid-state relay one end is connected with CPU, controlled by CPU, an end connects audible-visual annunciator, the work of guide sound light crossing-signal.
Described hydrogen-sensitive element is provided with more than three, is separately positioned on fuel cell electricity-generating system hydrogen inflow point, pile place and easily produces the hydrogen gas leakage place.
Band dual CAN bus controller, program storage and data-carrier store in the described CPU.
Described audible-visual annunciator has timing alarm and continues the two kinds of type of alarms of reporting to the police.
The present invention has overcome the defective in original technology owing to adopted above technical scheme.Compared with prior art, a kind of fuel cell hydrogen warning device that has the CAN communication interface of the present invention's design, except having the function that detects hydrogen gas leakage and report to the police, when hydrogen gas leakage reaches certain concentration, this device can in time cut off sources of hydrogen automatically by closing the hydrogen pipeline solenoid valve, guarantees safety.
Description of drawings
Fig. 1 is the hydrogen-sensitive element wiring schematic diagram;
Fig. 2 is a fuel cell electricity-generating system hydrogen alarming device fundamental diagram of the present invention;
Fig. 3 forms electrical block diagram for fuel cell electricity-generating system hydrogen alarming device of the present invention.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings and the specific embodiments.
Consult Fig. 2,3.Fig. 2 is a fuel cell electricity-generating system hydrogen alarming device fundamental diagram of the present invention.Comprise fuel cell generation 201, hydrogen-sensitive element 202, hydrogen solenoid valve 203, controller 204, CAN bus 205,205 ', hydrogen detection alarm device 206 among the figure.
Fig. 3 forms electrical block diagram for fuel cell electricity-generating system hydrogen alarming device of the present invention; Comprise CAN transceiver 301,302, photoisolator 302, power supply 303, CPU 304, three hydrogen-sensitive elements 202, solid-state relay 306, audible-visual annunciator 307 among the figure.
Embodiment 1
Present embodiment is further described below the inventive method in conjunction with concrete components and parts model.
In conjunction with Fig. 1, Fig. 2.CPU 304 adopts 32 ARM of the LPC2119 of PHILIPS, interior band 128K program storage, and the 16K data-carrier store, the dual CAN bus controller of interior band can carry out the CAN communication easily; Hydrogen gas sensor 202 adopts the hydrogen-sensitive element QM-Q1 of Ningbo Si Kai company, the density of hydrogen measurement range is 10ppm～5000ppm, it becomes the voltage signal of 0～3V with the density of hydrogen conversion of signals, and single-chip microcomputer mouthful is changed analog quantity by the A/D conversion, obtains corresponding density of hydrogen value.When the concentration of hydrogen is just sent sound and light alarm during greater than setting value, simultaneously with warning message by CAN bus 205,205 ' issue controller 204, controller 204 can send switching value signal at stop hydrogen pipeline solenoid valve 203 by the I/O mouth as required.
Embodiment 2
Present embodiment is the example that the hydrogen alarm is used on 10KW fuel cell power generation station or engine.
In conjunction with Fig. 1, Fig. 2.Three hydrogen-sensitive elements 202 are installed in the place that hydrogen inlet place, pile of fuel cell power generation station or engine 201 etc. is easy to generate hydrogen gas leakage respectively.Hydrogen alarm 206 is by two CAN redundancy communication buses 205,205 ' link to each other with controller 204.When in three hydrogen-sensitive elements 202 any detected density of hydrogen greater than 3000ppm, hydrogen alarm 206 just sent sound and light alarm, and the duration is 15 seconds.In these 15 seconds as density of hydrogen still greater than 3000ppm, then continue sound and light alarm, as less than 3000ppm then close sound and light alarm.Hydrogen alarm 206 sends sound and light alarm when detecting density of hydrogen greater than 5000ppm when wantonly 1 in 3 hydrogen-sensitive elements 202, and warning message by two CAN communication buss 205,205 ' send to controller 204.Controller 204 cuts out hydrogen pipeline solenoid valve 203 by the I/O mouth immediately, so just can guarantee the operation that fuel cell power generation station or engine 201 are safe and reliable.
Claims (4)
1. fuel cell electricity-generating system hydrogen alarming device that has the CAN interface, comprise fuel cell generation, hydrogen detection alarm device, controller, hydrogen solenoid valve and hydrogen-sensitive element, it is characterized in that described hydrogen detection alarm device has the CAN communication interface; Described hydrogen-sensitive element and hydrogen detection alarm device are electrically connected, the electric signal of detected reflection density of hydrogen is delivered to hydrogen detection alarm device, hydrogen detection alarm device is connected by two-way CAN bus with controller, warning message is sent to controller, controller and hydrogen solenoid valve are electrically connected, opening or closing of control hydrogen solenoid valve, the hydrogen solenoid valve is connected with fuel cell generation, and control is to the hydrogen supply of fuel cell generation; Described hydrogen detection alarm device comprises CPU, photoisolator, solid-state relay, two-way CAN transceiver, audible-visual annunciator and power supply; Described power supply is connected with CPU, CPU is provided operating voltage, and photoisolator is a two-way, and photoisolator one end is connected with CPU, one end is connected with the CAN transceiver, as the spacer assembly between CPU and the CAN transceiver, the CAN transceiver adopts two-way, is connected communication with controller, solid-state relay one end is connected with CPU, controlled by CPU, an end connects audible-visual annunciator, the work of guide sound light crossing-signal.
2. a kind of fuel cell electricity-generating system hydrogen alarming device that has the CAN interface according to claim 1, it is characterized in that, described hydrogen-sensitive element is provided with three, is separately positioned on fuel cell electricity-generating system hydrogen inflow point, pile place and easily produces the hydrogen gas leakage place.
3. a kind of fuel cell electricity-generating system hydrogen alarming device that has the CAN interface according to claim 1 is characterized in that, band dual CAN bus controller, program storage and data-carrier store in the described CPU.
4. a kind of fuel cell electricity-generating system hydrogen alarming device that has the CAN interface according to claim 1 is characterized in that, described audible-visual annunciator has timing alarm and continues the two kinds of type of alarms of reporting to the police.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100284076A CN100517405C (en) | 2005-08-03 | 2005-08-03 | Fuel cell electricity-generating system hydrogen alarming device with CAN interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100284076A CN100517405C (en) | 2005-08-03 | 2005-08-03 | Fuel cell electricity-generating system hydrogen alarming device with CAN interface |
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| CN1909001A CN1909001A (en) | 2007-02-07 |
| CN100517405C true CN100517405C (en) | 2009-07-22 |
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| CNB2005100284076A Active CN100517405C (en) | 2005-08-03 | 2005-08-03 | Fuel cell electricity-generating system hydrogen alarming device with CAN interface |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101980313A (en) * | 2010-11-05 | 2011-02-23 | 重庆长安汽车股份有限公司 | Hydrogen leakage alarm system for sedan |
| CN104681836A (en) * | 2013-12-02 | 2015-06-03 | 陕西荣基实业有限公司 | Automatic hydrogen adjustment and control system of hydrogen fuel cell |
| CN103887547B (en) * | 2014-04-23 | 2016-01-20 | 北京九谷超微科技有限公司 | A kind of safety control system |
| CN112820911B (en) * | 2021-01-12 | 2021-11-23 | 太原理工大学 | Flexible monitoring device for gas leakage of hydrogen fuel cell stack |
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Owner name: STATE GRID SHANGHAI ELECTRIC POWER COMPANY Free format text: FORMER OWNER: SHANGHAI SHEN-LI HIGH TECH CO., LTD. Effective date: 20131223 Owner name: SHANGHAI SHEN-LI HIGH TECH CO., LTD. Effective date: 20131223 |
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Free format text: CORRECT: ADDRESS; FROM: 201401 FENGXIAN, SHANGHAI TO: 200002 HUANGPU, SHANGHAI |
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Effective date of registration: 20131223 Address after: 200002 Nanjing East Road, Shanghai, No. 181, No. Patentee after: State Grid Shanghai Municipal Electric Power Company Patentee after: Shanghai Shen-Li High Tech Co., Ltd. Address before: 201401, Fengxian Shanghai Industrial Development Zone, dragon Yang Industrial Park, an international 27 Patentee before: Shanghai Shen-Li High Tech Co., Ltd. |