WO2021042252A1 - Procédé et dispositif de surveillance de la qualité du gaz - Google Patents

Procédé et dispositif de surveillance de la qualité du gaz Download PDF

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Publication number
WO2021042252A1
WO2021042252A1 PCT/CN2019/104109 CN2019104109W WO2021042252A1 WO 2021042252 A1 WO2021042252 A1 WO 2021042252A1 CN 2019104109 W CN2019104109 W CN 2019104109W WO 2021042252 A1 WO2021042252 A1 WO 2021042252A1
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WO
WIPO (PCT)
Prior art keywords
gas
volume flow
flow rate
ratio
quality
Prior art date
Application number
PCT/CN2019/104109
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English (en)
Chinese (zh)
Inventor
肖福明
曾频
印志强
方晓鹏
Original Assignee
潍柴动力股份有限公司
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Publication date
Application filed by 潍柴动力股份有限公司 filed Critical 潍柴动力股份有限公司
Priority to PCT/CN2019/104109 priority Critical patent/WO2021042252A1/fr
Publication of WO2021042252A1 publication Critical patent/WO2021042252A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents

Definitions

  • the invention relates to the technical field of safety monitoring, and more specifically, to a method and device for monitoring the quality of gas.
  • the present invention provides a method and device for monitoring the quality of gas.
  • the technical solution is as follows:
  • a method for monitoring the quality of gas comprising:
  • the preset threshold value is a ratio of the air volume flow rate to the gas volume flow rate under normal gas usage conditions.
  • the method further includes:
  • the method further includes:
  • the knock suppression operation is performed.
  • a device for monitoring the quality of gas comprising:
  • An obtaining module which is used to obtain air volume flow and gas volume flow
  • a judging module the judging module is used to judge whether the ratio of the air volume flow rate to the gas volume flow rate is greater than a preset threshold
  • the determining module is configured to determine that when the ratio of the air volume flow rate to the gas volume flow rate is greater than a preset threshold, the gas quality has changed and the gas has a tendency to knock.
  • the preset threshold value is a ratio of the air volume flow rate to the gas volume flow rate under normal gas use conditions.
  • the device further includes:
  • the execution module is configured to trigger the acquisition module when the ratio of the air volume flow rate to the gas volume flow rate is less than or equal to a preset threshold.
  • the device further includes:
  • the control module is configured to perform knock suppression operations when it is determined that there is a tendency to knock.
  • This method of monitoring gas quality monitors the air volume flow and the gas volume flow in real time, and compares the ratio of the two with the safety threshold to determine whether there is a tendency to knock, and then the corresponding explosion suppression can be quickly adopted. Shock operation to suppress the occurrence of knocking.
  • this method of monitoring gas quality predicts knocking by monitoring the quality of the gas source, even without installing knock sensors and other components, which greatly reduces development costs.
  • FIG. 1 is a schematic flowchart of a method for monitoring gas quality according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of another method for monitoring gas quality according to an embodiment of the present invention.
  • FIG. 3 is a schematic flowchart of another method for monitoring gas quality according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a device for monitoring gas quality provided by an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of another device for monitoring gas quality provided by an embodiment of the present invention.
  • Fig. 6 is a schematic structural diagram of another device for monitoring gas quality according to an embodiment of the present invention.
  • FIG. 1 is a schematic flowchart of a method for monitoring gas quality according to an embodiment of the present invention, and the method includes:
  • S102 Determine whether the ratio of the air volume flow rate to the gas volume flow rate is greater than a preset threshold.
  • the preset threshold value is a ratio of the air volume flow rate to the gas volume flow rate under normal gas use conditions.
  • gas with high calorific value is prone to knocking.
  • propane is prone to knocking compared to methane.
  • the ratio of the real-time air volume flow rate to the gas volume flow rate will change significantly.
  • the gas composition In different gas usage conditions, the gas composition will be different. In order to prevent normal operation under any gas composition, the monitoring of its gas quality is extremely important.
  • the gas source of pipeline gas or gas filling station is mainly a mixture of methane and air.
  • the composition of the gas source in the mine is more complex, belonging to a variety of mixed gas, which contains methane, ethane and propane and other high-calorific value gases.
  • methane the chemical formula is CH 4 , the calorific value per unit volume: 35.3882 [MJ/m 3 ], is the simplest hydrocarbon, composed of one carbon and four hydrogen atoms through SP 3 hybridization, therefore, the methane molecule
  • the structure is a regular tetrahedron structure, and the bond lengths of the four bonds are the same and the bond angles are the same.
  • methane is a colorless and odorless gas. In theory, 9.7 volumes of air are required to completely burn 1 volume of methane.
  • Propane The chemical formula is C 3 H 8 , the calorific value per unit volume: 93.207 [MJ/m 3 ], and the structural formula is CH 3 CH 2 CH 3 . It is usually in a gaseous state, but it is generally transported after being compressed into a liquid state. After crude oil or natural gas is processed, propane can be obtained from the refined oil.
  • the method for monitoring gas quality monitors the air volume flow and the gas volume flow in real time, and compares the ratio of the two with the safety threshold to easily and quickly determine whether there is a tendency to knock, and then can quickly adopt the corresponding Suppress knocking operation and suppress the occurrence of knocking.
  • this method of monitoring gas quality predicts knocking by monitoring the quality of the gas source, even without the installation of knock sensors and other components, which greatly reduces the development cost and can ensure that no matter what mixed gas composition is Both can effectively suppress knocking, thereby improving working stability.
  • the preset threshold may be the value range of the safety threshold to be reduced again in the case of the safety threshold to prevent knocking to a great extent.
  • this method of monitoring gas quality can also assist customers in troubleshooting the cause of knocking. For example, if there is a problem with the command or measure to control knock or suppress knock, but the engine is damaged for unknown reasons during use, it is suspected that the damage is caused by engine knock. You can call the engine stored in the ECU.
  • the volume ratio of air and gas before the damage occurs analyze whether this volume ratio is greater than the threshold of knock based on the quality of gas, if it exceeds this threshold, you can assist the customer service staff to determine that the user is using high calorific value gas
  • the resulting knock caused damage to the engine and better deal with after-sales claims and other issues.
  • FIG. 2 is a schematic flowchart of another method for monitoring gas quality according to an embodiment of the present invention, and the method further includes:
  • the target of predicting knocking continues to work, and returns to continue to obtain the air volume flow rate and the gas volume flow rate, To ensure the purpose of real-time monitoring, the timeliness of suppressing knocking can be further improved.
  • FIG. 3 is a schematic flowchart of another method for monitoring gas quality according to an embodiment of the present invention, and the method further includes:
  • the knock suppression operation when the target for predicting knock is different, the knock suppression operation is different.
  • the knock suppression operation when the knock suppression operation is performed on the engine, it includes but is not limited to the operation of retarding the ignition advance angle.
  • the method of monitoring gas quality tends to occurrence of knocking in accordance with the physical characteristics of high BTU gas, e.g., with respect to methane, a high-calorific gas belonging propane, propane combustion 1m 3 needs to 24.7m 3 Air, burning 1m 3 of methane requires 9.7m 3 of air.
  • the ratio of 24.7:9.7 belongs to a relatively high signal-to-noise ratio. That is to say, a clear distinction can generally eliminate interference errors caused by other factors.
  • the ratio of the air volume flow rate to the gas volume flow rate has a larger signal-to-noise ratio and a stronger anti-interference ability.
  • FIG. 4 is a schematic structural diagram of a device for monitoring gas quality according to an embodiment of the present invention.
  • the device includes:
  • An obtaining module 41 which is used to obtain air volume flow and gas volume flow
  • a judging module 42 for judging whether the ratio of the air volume flow rate to the gas volume flow rate is greater than a preset threshold
  • the determining module 43 is configured to determine that when the ratio of the air volume flow rate to the gas volume flow rate is greater than a preset threshold, the gas quality has changed and the gas has a tendency to knock.
  • the preset threshold value is a ratio of the air volume flow rate to the gas volume flow rate under normal gas use conditions.
  • Fig. 5 is a schematic structural diagram of another device for monitoring gas quality according to an embodiment of the present invention, and the device further includes:
  • the execution module 44 is configured to trigger the acquisition module when the ratio of the air volume flow rate to the gas volume flow rate is less than or equal to a preset threshold.
  • FIG. 6 is a schematic structural diagram of another device for monitoring gas quality according to an embodiment of the present invention, and the device further includes:
  • the control module 45 is configured to perform a knock suppression operation when it is determined that there is a tendency to knock.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

L'invention concerne un procédé et un dispositif de surveillance de la qualité d'un gaz. Le procédé comprend les étapes consistant à : acquérir un débit volumique d'air et un débit volumique d'un gaz (S101) ; déterminer si un rapport entre le débit volumique d'air et le débit volumique du gaz est supérieur à un seuil prédéfini (S102) ; et si tel est le cas, déterminer que la qualité du gaz a changé et qu'il existe une plus grande probabilité de cliquetis (S103). Selon le procédé, un débit volumique d'air et un débit volumique d'un gaz sont surveillés en temps réel, puis un rapport entre les deux débits volumiques est obtenu à partir du calcul et comparé à un seuil de sécurité, de telle sorte que l'on puisse déterminer de manière pratique et rapide s'il y a une plus grande probabilité de cliquetis, et qu'une opération correspondante de suppression des cliquetis puisse être rapidement effectuée pour supprimer l'apparition de cliquetis. Dans le procédé de surveillance de la qualité d'un gaz, la prédiction du cliquetis est effectuée par surveillance de la qualité d'une source de gaz et ne nécessite pas l'installation de composants tels qu'un capteur de cliquetis, ce qui permet de réduire au maximum les coûts de développement.
PCT/CN2019/104109 2019-09-03 2019-09-03 Procédé et dispositif de surveillance de la qualité du gaz WO2021042252A1 (fr)

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PCT/CN2019/104109 WO2021042252A1 (fr) 2019-09-03 2019-09-03 Procédé et dispositif de surveillance de la qualité du gaz

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2019/104109 WO2021042252A1 (fr) 2019-09-03 2019-09-03 Procédé et dispositif de surveillance de la qualité du gaz

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WO2021042252A1 true WO2021042252A1 (fr) 2021-03-11

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5791145A (en) * 1994-09-30 1998-08-11 Cooper Cameron Corporation Natural gas engine control system
CN1690391A (zh) * 2004-04-27 2005-11-02 株式会社丰田自动织机 均质充气压燃式发动机及运行均质充气压燃发动机的方法
EP1707791A2 (fr) * 2005-03-31 2006-10-04 Mazda Motor Corporation Dispositif de commande d'un moteur à allumage commandé
US20070251509A1 (en) * 2006-04-26 2007-11-01 Denso Corporation Air-fuel ratio control apparatus of internal combustion engine
US20090283080A1 (en) * 2008-05-15 2009-11-19 Lycoming Engines, A Division Of Avco Corporation Method and apparatus for providing fuel to an aircraft engine
JP2016006305A (ja) * 2014-06-20 2016-01-14 本田技研工業株式会社 内燃機関の制御装置
WO2017135957A1 (fr) * 2016-02-04 2017-08-10 Cummins Inc. Système et procédé pour le réglage automatique de paramètres de performance de moteur pendant une variation de qualité de carburant
CN109209660A (zh) * 2018-09-13 2019-01-15 湖北谊立舜达动力科技有限公司 一种天然气发动机空燃比控制系统

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5791145A (en) * 1994-09-30 1998-08-11 Cooper Cameron Corporation Natural gas engine control system
CN1690391A (zh) * 2004-04-27 2005-11-02 株式会社丰田自动织机 均质充气压燃式发动机及运行均质充气压燃发动机的方法
EP1707791A2 (fr) * 2005-03-31 2006-10-04 Mazda Motor Corporation Dispositif de commande d'un moteur à allumage commandé
US20070251509A1 (en) * 2006-04-26 2007-11-01 Denso Corporation Air-fuel ratio control apparatus of internal combustion engine
US20090283080A1 (en) * 2008-05-15 2009-11-19 Lycoming Engines, A Division Of Avco Corporation Method and apparatus for providing fuel to an aircraft engine
JP2016006305A (ja) * 2014-06-20 2016-01-14 本田技研工業株式会社 内燃機関の制御装置
WO2017135957A1 (fr) * 2016-02-04 2017-08-10 Cummins Inc. Système et procédé pour le réglage automatique de paramètres de performance de moteur pendant une variation de qualité de carburant
CN109209660A (zh) * 2018-09-13 2019-01-15 湖北谊立舜达动力科技有限公司 一种天然气发动机空燃比控制系统

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