CN211287886U - Gas engine mixed gas control device capable of adapting to change of methane concentration in large range - Google Patents

Gas engine mixed gas control device capable of adapting to change of methane concentration in large range Download PDF

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Publication number
CN211287886U
CN211287886U CN201922468905.2U CN201922468905U CN211287886U CN 211287886 U CN211287886 U CN 211287886U CN 201922468905 U CN201922468905 U CN 201922468905U CN 211287886 U CN211287886 U CN 211287886U
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engine
oxygen sensor
methane concentration
gas
fuel ratio
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CN201922468905.2U
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李庆飞
莫员
王家祥
曾志龙
盘子林
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Guangxi Yuchai Marine and Genset Power Co Ltd
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Guangxi Yuchai Machinery Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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Abstract

The utility model discloses a gas engine gas mixing control device of adaptable methane concentration change on a large scale, this gas engine gas mixing control device includes: a Venturi type electric control mixer, a wide-area oxygen sensor, a monitor meter and a methane concentration potentiometer; the wide-range oxygen sensor is arranged on the exhaust pipe and used for measuring the actual air-fuel ratio of the tail gas, the monitoring instrument is connected with the methane concentration potentiometer and used for displaying the measured actual air-fuel ratio in real time, and the wide-range oxygen sensor, the monitoring instrument and the methane concentration potentiometer are respectively and electrically connected with an engine ECU (electronic control Unit); the engine ECU can compare the actual air-fuel ratio measured by the wide-area oxygen sensor with the set target air-fuel ratio to adjust the opening of the Venturi type electric control mixer so as to realize the closed-loop control of the concentration of the mixed gas. The utility model discloses can realize the air-fuel ratio closed-loop control and the demonstration of air-fuel ratio in the full operating mode scope.

Description

Gas engine mixed gas control device capable of adapting to change of methane concentration in large range
Technical Field
The utility model relates to an engine technical field especially relates to a gas engine mixes gas control device that gas engine mixes that adaptable methane concentration changes on a large scale.
Background
In recent years, with the vigorous national advocated green energy, biogas engineering, landfill gas engineering and the like which turn waste into wealth have been greatly developed. Biogas (landfill gas) is obtained by fermenting animal wastes, and its components are greatly affected by the environment, raw materials, and fermentation equipment. The gas source is quite complex in composition and the contents of the individual components are not stable, being mainly methane (CH)4About 30% to about 70% by volume); secondly carbon dioxide (CO)2About 20% to about 50% by volume); in addition, small amounts of hydrogen sulfide (H)2S), nitrogen (N)2) Oxygen (O)2) Carbon monoxide (CO), steam, etc. account for about 10%.
Gas engines have received much attention from farms and landfill sites as a flexible and efficient energy conversion device. The gas engine burns by using gas sources such as methane or landfill gas, converts chemical energy of the gas sources into mechanical energy, and then transmits the mechanical energy to the generator to generate electricity. Methane in the gas source is used as a main combustion medium, and other components have important influence on combustion. The main flow of the technology in the developed countries is to pretreat the gas source components, i.e. to purify or enrich the gas before it enters the engine, so that the methane component content is high and stable (generally above 85%), thus ensuring the normal start and efficient operation of the gas engine. Domestic technology generally only carries out desulfurization and dehydration treatment on the landfill gas (methane) and does not purify the landfill gas. Therefore, the engine is required to adapt to the air source with changed components so as to ensure the generator set to operate normally. Particularly during the start-up phase, the engine is particularly susceptible to the composition of the air supply.
The existing control technology of landfill gas (biogas) engines at home and abroad for the concentration of mixed gas mainly comprises the following steps:
1. mechanical proportional mixer: the mixer is generally of a diaphragm type, and the concentration of the mixed gas is related to the diaphragm structure and the opening degree of a gas inlet of the mixer. For a given mechanical proportioner, the diaphragm configuration has been determined and the mixer consistency is controlled by the gas inlet opening, which is manually adjusted by a nut knob. Different working conditions need different opening degrees to control, the operation is very complicated, and certain experience is needed. Fig. 1 is a schematic diagram of a mechanical proportional mixer, when an engine needs to be started, a commissioning worker needs to manually adjust a screw 102 on a mixer 101 to adjust the opening of the mixer according to the current starting condition (whether there is a fire sign), and after multiple adjustments, a proper mixture concentration is obtained and the opening is fixed as the next starting opening. Similarly, other working conditions are also similar adjustment modes. But requires readjustment once the air supply has changed and requires a lot of experience to complete the adjustment. The technology has the advantages of simple structure, convenient operation and low cost. However, the technique has the following disadvantages: the automation degree is low, and the operation is blindness; failure analysis is not facilitated; the control precision of the concentration of the mixed gas is poor; the reliability of the diaphragm result is poor; the adaptability is poor.
2. Mechanical proportional mixer + throttle + oxygen sensor (as disclosed for example in patent CN 201910748623X): the mixer device is based on the first kind, and adds an electronic throttle valve (or bypass valve) at the gas inlet end or the air inlet end. The opening of the electronic throttle valve is controlled by the ECU, the parameters of the ECU are set by engineering personnel according to the situation on site, and the oxygen sensor can measure the actual concentration of the mixed gas and carry out PID closed-loop control on the concentration of the mixed gas. The mode can adapt to a gas source with lower methane content, and the operation is more stable and efficient. Fig. 2 is a schematic diagram of a system for controlling a mechanical proportional mixer + a throttle valve + an oxygen sensor, which is based on a first control mode, and is implemented by adding a throttle valve 201 control to a gas or air pipeline and adding an oxygen sensor 202 for closed-loop control. Compared with the first mode, the concentration of the mixer 203 can be controlled more accurately, the adaptive gas source is wider, and the method can be applied to low-concentration gas. However, the anti-interference capability is still weak, and once the air source component is changed, the opening degree of the throttle valve needs to be reset (the ECU program needs to be changed). There are also disadvantages as follows: the starting stage is not controlled, the air-fuel ratio has no display function, the operability is low, the maintenance is inconvenient, the adaptability is general, the reliability is poor (both a diaphragm and a throttle disc are easy to damage), and the control precision is general.
3. Venturi type electric controlled mixer + potentiometer: the novel mixing device is characterized in that a potentiometer is added on the basis of a Venturi type electric control mixing device, the potentiometer can be adjusted according to different methane concentrations (the relationship between the methane concentration and the opening degree of the potentiometer is calibrated in an ECU), and different opening degrees of the potentiometer correspond to different opening degrees of the mixing device, so that the concentration of mixed gas under various working conditions is better controlled. The opening degree of the potentiometer is corrected not only in the starting stage, but also in other specific working conditions. Fig. 3 is a schematic diagram of a venturi-type electric-controlled mixer + potentiometer system, wherein a potentiometer is added on the basis of a venturi-type electric-controlled mixer 301. Before starting, the instrument is used for measuring the methane content of the gas source, the corresponding potential is adjusted according to the current methane concentration, and the ECU adjusts the opening of the mixer according to the current potential, so that the concentration of the mixed gas in the starting stage can be well controlled, and the efficient operation of the engine is ensured. Methane concentration measurement devices are generally expensive and less reliable and are not available to many users. In addition, if concentration changes occur in the running process of the engine, the device cannot be self-adaptive, and the potentiometer needs to be adjusted again to adjust the proper concentration of the mixed gas. The adjustment mode of the potentiometer also belongs to an open-loop mode for controlling the concentration of the mixed gas, and the control precision is only relatively improved.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an adaptable gas engine mixes gas control device that methane concentration changes on a large scale, its air-fuel ratio closed-loop control and the air-fuel ratio that can realize the full operating mode within range show.
In order to achieve the above object, the utility model provides a gas engine mixes gas controlling means that adaptable methane concentration changes on a large scale, this gas engine mixes gas controlling means includes: a Venturi type electric control mixer, a wide-area oxygen sensor, a monitor meter and a methane concentration potentiometer; the system comprises a wide-range oxygen sensor, a monitoring instrument, an engine ECU (electronic control Unit), a methane concentration potentiometer, a methane concentration sensor, a methane concentration potentiometer, a fuel tank and a fuel tank, wherein the wide-range oxygen sensor is arranged on an exhaust pipe and used for measuring the actual air-fuel ratio of tail gas, the monitoring instrument is connected with the; the wide-range oxygen sensor enters a working state after the engine is started successfully, and the engine ECU can compare the actual air-fuel ratio measured by the wide-range oxygen sensor with the set target air-fuel ratio to adjust the opening of the Venturi type electric control mixer so as to realize the closed-loop control of the concentration of the mixed gas.
In one or more embodiments, the gas engine mixture control device further comprises an oxygen sensor preheating switch, the oxygen sensor preheating switch is electrically connected with the engine ECU, and the oxygen sensor preheating switch is used for controlling the working state of the wide-range oxygen sensor in the starting stage of the engine.
In one or more embodiments, the gas engine gas mixture control device further comprises a methane concentration measuring device for measuring the methane concentration in the pipeline biogas, and when the engine cannot be normally started, the methane concentration measuring device firstly obtains the methane concentration, manually adjusts a methane concentration potentiometer to a corresponding position, then triggers an oxygen sensor preheating switch, and starts the engine after the air-fuel ratio of the monitor meter is displayed.
In one or more embodiments, the gas engine gas mixture control device does not include a methane concentration measuring device, when the engine cannot be started normally, the oxygen sensor preheating switch is directly triggered, and after the air-fuel ratio of the monitor meter is displayed, the engine is started.
Compared with the prior art, according to the utility model discloses an adaptable gas engine gas mixture control device who changes on a large scale methane concentration has following advantage:
1. the automatic stratification degree is high: the air-fuel ratio is controlled in a closed loop mode under all working conditions, and the engine can operate in the optimal region.
2. The operability is strong: the full working condition can display the air-fuel ratio, the opening of the starting mixer is adjustable, and great help is provided for the operation and maintenance of the engine.
3. The reliability is high: the preheating function is triggered only when needed, and the Venturi mixer is high in reliability.
4. The operation and maintenance cost is low.
Drawings
FIG. 1 is a system schematic of a prior art mechanical proportional mixer.
FIG. 2 is a system schematic of a prior art mechanical proportional mixer + throttle + oxygen sensor.
Fig. 3 is a system schematic of a prior art venturi electronically controlled mixer + potentiometer.
Fig. 4 is a schematic diagram of a gas engine mixture control device according to an embodiment of the present invention.
Description of the main reference numerals:
401-a Venturi type electric control mixer, 402-a wide-range oxygen sensor, 403-a monitoring instrument, 404-a methane concentration potentiometer, 405-an oxygen sensor preheating switch, 406-an ECU, 407-a biogas engine.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited by the following detailed description.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
As shown in fig. 4, the gas engine mixture control device adaptable to a large range of methane concentration variation according to an embodiment of the present invention is integrated with a wide-range oxygen sensor 402, a monitoring instrument 403, and a methane concentration potentiometer 404 on the basis of a venturi-type electronic control mixer 401. Wherein a wide-area oxygen sensor 402 is provided on the exhaust pipe for measuring the actual air-fuel ratio of the exhaust gas. The monitoring meter 403 is connected to a methane concentration potentiometer 404, and the monitoring meter 403 is used for displaying the measured actual air-fuel ratio in real time. And the wide-range oxygen sensor 402, the monitoring meter 403, and the methane concentration potentiometer 404 are electrically connected to the engine ECU406, respectively. The wide-range oxygen sensor 402 enters a working state after the engine is successfully started, and the engine ECU can adjust the opening degree of the venturi-type electrically controlled mixer 401 according to the comparison between the actual air-fuel ratio measured by the wide-range oxygen sensor and the set target air-fuel ratio, so as to realize the closed-loop control of the concentration of the mixed gas.
In one or more embodiments, the gas engine mixture control device further comprises an oxygen sensor preheating switch 405, the oxygen sensor preheating switch 405 is electrically connected with the engine ECU406, and the oxygen sensor preheating switch 405 is used for controlling the working state of the wide-range oxygen sensor during the engine starting stage. During the engine start-up phase, the wide-area oxygen sensor 402 is generally not active (considering the reliability of the oxygen sensor), and the air-fuel ratio is open-loop controlled. However, under the condition that the gas source components are changed, the wide-range oxygen sensor can be enabled to work before starting, and the opening degree of the potentiometer is adjusted by monitoring the air-fuel ratio in the starting process, so that the concentration of the mixed gas is accurately controlled.
In one or more embodiments, the gas engine mixture control device further comprises a methane concentration measuring device for measuring the methane concentration in the pipeline biogas.
The utility model discloses a gas engine mixes gas control device's control process specifically does:
1. after the engine is started successfully, the wide-range oxygen sensor 402 mounted on the exhaust pipe enters a working state, on one hand, the monitoring instrument 403 can display the concentration of the air-fuel mixture at the moment, on the other hand, the ECU406 compares the actual air-fuel ratio measured by the wide-range oxygen sensor 402 with the set target air-fuel ratio to adjust the opening degree of the Venturi type electric control mixer 401, and finally, the closed-loop control of the air-fuel ratio is realized.
2. When the engine cannot be started normally due to the air supply:
(1) if a methane concentration measuring device is on site, the methane concentration is obtained first, and the methane concentration potentiometer 404 is manually adjusted to a corresponding position; then triggering an oxygen sensor preheating switch 405, and starting the engine after the air-fuel ratio of the monitoring instrument 403 is displayed; during the starting process, the condition of the air-fuel ratio is observed, if the condition is not suitable, the air-fuel ratio meets the starting requirement by adjusting the methane concentration potentiometer 404, and finally the successful starting is realized. After the start is successful, the air-fuel ratio automatically enters a closed-loop control mode.
(2) If no methane concentration measuring equipment exists on site, the oxygen sensor preheating switch 405 is directly triggered, and after the air-fuel ratio of the monitoring instrument 403 is displayed, the engine is started; during the starting process, the condition of the air-fuel ratio is observed, if the condition is not suitable, the air-fuel ratio meets the starting requirement by adjusting the methane concentration potentiometer 404, and finally the successful starting is realized. After the start is successful, the air-fuel ratio automatically enters a closed-loop control mode.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims (4)

1. The utility model provides a gas engine gas mixing control device that adaptable methane concentration changes on a large scale which characterized in that, gas engine gas mixing control device includes: a Venturi type electric control mixer, a wide-area oxygen sensor, a monitor meter and a methane concentration potentiometer;
the wide-range oxygen sensor is arranged on the exhaust pipe and used for measuring the actual air-fuel ratio of the tail gas, the monitoring instrument is connected with the methane concentration potentiometer and used for displaying the measured actual air-fuel ratio in real time, and the wide-range oxygen sensor, the monitoring instrument and the methane concentration potentiometer are respectively and electrically connected with an engine ECU (electronic control Unit); the engine ECU can compare the actual air-fuel ratio measured by the wide-area oxygen sensor with the set target air-fuel ratio to adjust the opening of the Venturi type electric control mixer so as to realize closed-loop control of the concentration of the mixed gas.
2. The gas engine gas mixing control device according to claim 1, further comprising an oxygen sensor preheating switch electrically connected to the engine ECU, the oxygen sensor preheating switch being configured to control an operating state of the wide-range oxygen sensor during an engine start-up phase.
3. The gas engine gas mixing control device according to claim 2, further comprising a methane concentration measuring device for measuring the methane concentration in the pipeline biogas, and when the engine cannot be normally started, the methane concentration measuring device first obtains the methane concentration, manually adjusts the methane concentration potentiometer to a corresponding position, then triggers an oxygen sensor preheating switch, and starts the engine after the monitoring instrument displays an air-fuel ratio.
4. The gas engine gas mixing control device according to claim 2, wherein the gas engine gas mixing control device does not include a methane concentration measuring device, when the engine cannot be normally started, the oxygen sensor preheating switch is directly triggered, and after the air-fuel ratio of the monitoring instrument is displayed, the engine is started.
CN201922468905.2U 2019-12-31 2019-12-31 Gas engine mixed gas control device capable of adapting to change of methane concentration in large range Active CN211287886U (en)

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CN201922468905.2U CN211287886U (en) 2019-12-31 2019-12-31 Gas engine mixed gas control device capable of adapting to change of methane concentration in large range

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201922468905.2U CN211287886U (en) 2019-12-31 2019-12-31 Gas engine mixed gas control device capable of adapting to change of methane concentration in large range

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CN211287886U true CN211287886U (en) 2020-08-18

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Effective date of registration: 20230112

Address after: No.88 Tianqiao West Road, Yulin City, Guangxi Zhuang Autonomous Region

Patentee after: Guangxi Yuchai Ship Electric Power Co.,Ltd.

Address before: 537005 No. 88 flyover West Road, the Guangxi Zhuang Autonomous Region, Yulin

Patentee before: Guangxi Yuchai Machinery Co.,Ltd.

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