CN113091062A - Biogas combustion monitoring device and method - Google Patents
Biogas combustion monitoring device and method Download PDFInfo
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- CN113091062A CN113091062A CN202110485459.5A CN202110485459A CN113091062A CN 113091062 A CN113091062 A CN 113091062A CN 202110485459 A CN202110485459 A CN 202110485459A CN 113091062 A CN113091062 A CN 113091062A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/005—Regulating fuel supply using electrical or electromechanical means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
- F23N5/08—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements
- F23N5/082—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements using electronic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
- F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The invention discloses a biogas combustion monitoring device and a method, and the invention has the conception that the monitoring of biogas conveying flow data in a biogas conveying pipeline can be realized through a flow electric control instrument arranged on the biogas conveying pipeline, a flame detector arranged in a combustion chamber of a biogas burner and a temperature electric control instrument, and the flame combustion state and/or temperature change in the biogas burner can be monitored in the whole combustion process, so that a reliable monitoring framework is provided for ignition effectiveness, abnormal flameout and valve leakage, and further, the whole biogas combustion process can be comprehensively and accurately controlled safely and efficiently.
Description
Technical Field
The invention relates to the field of tobacco processing, in particular to a biogas combustion monitoring device and a biogas combustion monitoring method.
Background
The biogas combustion system is characterized in that biogas generated by anaerobic fermentation treatment of waste water produced by a tobacco manufacturing enterprise is collected and stabilized and then ignited and combusted in a biogas combustor (also called a torch device), so that waste biogas can be consumed in a combustion mode, and the effect of environmental protection is achieved.
In the biogas combustion process, the correct monitoring of the whole combustion state (including an ignition stage, a combustion stage, a flameout stage and the like) plays a crucial role in ignition safety, stable combustion and environmental protection. If the ignition temperature within a certain time is used as the judgment basis for successful ignition, the system is in a repeated ignition starting and stopping state due to the influence of the external environment or the ignition failure caused by the problem of a temperature instrument, and the operation efficiency of a torch is seriously influenced; if sudden flameout occurs in the normal combustion process, the methane cannot be combusted in time, and a large amount of methane is introduced into the atmosphere, thereby seriously causing environmental pollution; in addition, when the biogas burner is stopped, if the related gas supply valve group leaks, biogas can flow into the atmosphere, and environmental pollution is seriously caused.
Disclosure of Invention
Therefore, the invention aims to provide the biogas combustion monitoring device and the method, which can comprehensively monitor the whole biogas combustion state.
The technical scheme adopted by the invention is as follows:
in a first aspect, the present invention provides a biogas combustion monitoring device, comprising:
the burning controller, steady voltage gas holder, marsh gas combustor and steady voltage gas holder with marsh gas pipeline between the marsh gas combustor still includes: the flow electric control instrument is arranged on the methane conveying pipeline, and the flame detector and the temperature electric control instrument are arranged in a combustion chamber of the methane combustor;
the flow electric control instrument, the flame detector and the temperature electric control instrument are respectively in electric signal connection with the combustion controller;
the flow electric control instrument is used for monitoring biogas conveying flow data in the biogas conveying pipeline; the flame detector is used for monitoring the flame combustion state in the biogas combustor; the temperature electric control instrument is used for monitoring the temperature change in the biogas burner.
In at least one possible implementation manner, the device further comprises a gas level meter and a gas supply valve bank which are electrically connected with the combustion controller;
the gas level meter is arranged on the pressure stabilizing gas cabinet and used for monitoring the methane quantity of the pressure stabilizing gas cabinet;
the gas supply valve group is arranged on the methane conveying pipeline and used for adjusting and switching on/off the pressure stabilizing gas cabinet to supply gas to the ignition unit of the methane burner.
In at least one possible implementation manner, the gas supply valve group comprises a switch electromagnetic valve and a proportion regulating valve which are arranged on the methane conveying pipeline in parallel;
the switch electromagnetic valve is used for controlling the on-off of the biogas supply, and the proportion regulating valve is used for regulating the gas supply amount of the biogas supply.
In at least one possible implementation manner, the device further comprises an alarm module electrically connected with the combustion controller, wherein the alarm module is used for outputting an alarm signal.
In at least one possible implementation manner, the alarm module is integrated in an upper computer electrically connected with the combustion controller.
In at least one possible implementation, the flame detector employs any one of: ultraviolet flame detector, infrared flame detector, ultraviolet and infrared mixed detector.
In a second aspect, the present invention provides a biogas combustion monitoring method, which includes:
after the preset ignition condition is reached, opening a valve to supply gas to an ignition unit of the biogas burner and triggering the ignition unit to execute ignition operation;
detecting flame and/or temperature rise of a combustion chamber of the biogas burner;
judging whether the ignition is successful or not according to the flame detection result and/or the temperature rise value detection result;
after the ignition is judged to be successful, continuously tracking the flame state in the combustion chamber of the biogas burner;
judging whether a combustion chamber of the biogas burner is flameout or not according to the flame state;
after flameout is judged, closing the valve and continuously monitoring biogas flow data in the biogas conveying pipeline;
and judging whether methane leakage occurs or not according to the methane flow data.
In at least one possible implementation manner, the preset ignition condition includes:
monitoring whether the air level data of the pressure stabilizing air cabinet reaches a preset threshold value;
if yes, executing ignition operation within preset time;
if not, continuously monitoring biogas flow data in the biogas conveying pipeline while monitoring the gas level data;
and judging whether methane leakage occurs or not according to the methane flow data.
In at least one possible implementation manner, the method further includes:
continuously monitoring the gas level data of the pressure-stabilizing gas holder in the combustion process after the ignition of the biogas burner is successful;
and adjusting the gas supply amount to the biogas burner according to the gas level data and deciding whether to enter a normal flameout program.
In at least one possible implementation manner, the method further includes:
judging whether the combustion chamber of the biogas burner is abnormally extinguished or not by combining the gas level data and the flame state;
and if the abnormal flameout is judged to occur, outputting an abnormal flameout alarm signal.
The invention has the conception that the flow electric control instrument arranged on the methane conveying pipeline, the flame detector arranged in the combustion chamber of the methane burner and the temperature electric control instrument can realize the monitoring of methane conveying flow data in the methane conveying pipeline and the monitoring of the flame combustion state and/or temperature change in the methane burner in the whole combustion process, thereby providing a reliable monitoring framework for ignition effectiveness, abnormal flameout and valve leakage and further realizing the comprehensive and accurate safety and efficiency control of the whole methane combustion process.
Furthermore, in combination with the above hardware architecture, a corresponding monitoring mode can be configured, so that compared with the prior art, the invention can at least achieve the following effects:
(1) during ignition, temperature rise values and/or flame detection results in a combustion chamber of the biogas burner can be detected within a certain ignition time as judgment conditions for successful ignition, rather than only taking the temperature of the combustion chamber as a judgment condition according to whether a preset value is reached, so that different ignition temperature thresholds need to be set according to environmental temperature differences in different seasons, and the situation of repeated ignition failure caused by improper setting of the temperature thresholds can be effectively prevented.
(2) After ignition is successful, the flame state can be automatically tracked in real time through the flame detector, whether flameout conditions are normal or not can be determined by matching with the change of the air supply quantity, and warning signals can be output by means of the alarm module after abnormal flameout.
(3) When the biogas burner is in a shutdown state (including before ignition, after normal combustion and after abnormal flameout shutdown), whether the condition that the valve is not closed in place exists or not is judged by monitoring the biogas flow in the biogas conveying pipeline, namely, the problem of gas leakage caused by the valve is monitored, and corresponding leakage warning information can be sent out, so that the environmental pollution can be effectively avoided.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings, in which:
fig. 1 is a schematic view of a biogas combustion monitoring apparatus provided in an embodiment of the present invention;
fig. 2 is a flowchart of a biogas combustion monitoring method according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
The invention provides a reference for implementing a hardware scheme for monitoring methane combustion, and as shown in fig. 1, the methane combustion monitoring device may include: the combustion controller 1, the pressure stabilizing gas holder 2, the biogas burner 3 and the biogas conveying pipeline 4 between the pressure stabilizing gas holder 2 and the biogas burner 3 may further include: a flow electric control instrument 5 arranged on the biogas conveying pipeline 4, a flame detector 6 arranged inside a combustion chamber of the biogas burner 3 and a temperature electric control instrument 7.
The flow rate electric control instrument 5, the flame detector 6 and the temperature electric control instrument 7 are respectively in electrical signal connection with the combustion controller 1 (the electrical connection relationship is indicated by dotted lines in the figure, and it can be understood that the biogas burner and the pressure-stabilizing gas holder can also be in electrical signal connection with the combustion controller in actual operation, which is not described herein again). The flow electric control instrument 5 is used for monitoring methane conveying flow data in the methane conveying pipeline 4; the flame detector 6 is used for monitoring the flame combustion state in the biogas burner 3; the temperature electric control instrument 7 is used for monitoring the temperature change in the biogas burner 3.
Through the device embodiment, the ignition state, the combustion state, the flameout state and the leakage condition can be effectively monitored by the signals sent by the flame detector 6, the temperature electric control instrument 7 and the flow electric control instrument 5. The specific monitoring mode can be designed according to the above hardware architecture as required, and only one schematic description is provided here:
for example, the flame detector 6 and the temperature electric control instrument 7 may be used as an actual state detection means when the biogas burner 3 is ignited and combusted, if it is detected that the temperature rise of the biogas burner reaches a preset set value and/or a continuous flame signal is detected, it may be considered as an ignition successful state, otherwise, it may be considered as an ignition unsuccessful state, and an alarm signal may be output through an alarm module electrically connected to the combustion controller 1, the alarm module may be an alarm device such as sound, light, voice, and the like, and more preferably, the invention may also be combined with the alarm module shown in fig. 1 to prompt or display relevant state information in an upper computer 100 electrically connected to the combustion controller 1, including integrating the alarm module, and as to how to display the state, how to output alarm information, and the like, the invention may not be limited, but needs to point out, accordingly, in practice, the combustion controller 1 can be understood as a slave computer and can be implemented by taking into account the prior art.
The flame detector 6 can assist in monitoring whether ignition is successful or not in the ignition stage, and can also be used for monitoring whether flame in the combustion chamber is extinguished (whether normal automatic flameout is performed after methane is exhausted or sudden abnormal flameout is caused by an unexpected situation) in the combustion process after ignition is successful, and can be reliably captured, for example, once the sudden flame state is lost during normal combustion, the corresponding air supply valve can be timely turned off, so that environmental pollution to the atmosphere is avoided, and in combination with the above example, the alarm module can output warning information of abnormal flameout, so that the invention is not described in detail and limited. In practice, the flame detector 6 may be any one of the following: ultraviolet flame detector, infrared flame detector, ultraviolet and infrared mixed detector.
In the foregoing, the flow electrically controlled instrument 5 can be used as a flow monitoring means in a biogas conveying pipeline, on one hand, the flow electrically controlled instrument can be used for displaying the stability of gas supply of the biogas burner, and preferably, can also be used for detecting whether biogas is leaked, for example, when the biogas burner is shut down (no matter before ignition or after flameout), if the related valve is not closed tightly, the flow electrically controlled instrument 5 inevitably generates a reading, the possibility of leakage risk of biogas can be prompted, and accordingly, a leakage alarm indication can be made through the alarm module upper computer to remind an operator to process, so as to avoid atmospheric pollution.
On the basis of the above embodiment, it can be further explained with reference to fig. 1 that the apparatus may further include a gas level meter 10 and a gas supply valve group 20 electrically connected to the combustion controller 1, specifically, the gas level meter 10 may be installed on the pressure stabilizing gas cabinet 2 for monitoring the amount of methane in the pressure stabilizing gas cabinet 2, and the gas supply valve group 20 is installed on the methane delivery pipe 4 for adjusting and switching the pressure stabilizing gas cabinet 2 to supply gas to the ignition unit of the methane burner 3. In practical operation, in order to realize the on-off and adjustment functions, preferably, the gas supply valve group 20 may specifically include a switch electromagnetic valve 21 and a proportional control valve 22, which are arranged in parallel on the biogas conveying pipeline 4, wherein the switch electromagnetic valve 21 is used for controlling the on-off of the biogas supply, and the proportional control valve 22 is used for adjusting the gas supply amount of the biogas supply.
In combination with the example, the biogas generated in the manufacturing process is collected in the pressure-stabilizing gas tank, and the gas level meter installed on the pressure-stabilizing gas tank can be used for reflecting the biogas collection amount, so that the gas supply valve set can be controlled and adjusted according to the gas level change. That is, the gas level meter can be used as the gas level display of the biogas pressure stabilizing cabinet, the ignition of the gas supply valve set and the biogas burner, and then the interlocking regulation and control are performed, and the following references are provided only by way of illustration: for example, by setting different gas level limits, on the one hand, to open the valve and trigger ignition, and on the other hand, to monitor gas level changes during combustion, control of the gas supply amount by means of, for example, PID may be performed, for example, the higher the gas level is, the greater the gas level is, the smaller the gas level is, and the like.
In summary, the present invention is conceived in that the flow rate electric control instrument disposed on the biogas conveying pipeline, the flame detector disposed inside the combustion chamber of the biogas burner, and the temperature electric control instrument can monitor the biogas conveying flow rate data in the biogas conveying pipeline, and can monitor the flame combustion state and/or temperature change in the biogas burner during the whole combustion process, thereby providing a reliable monitoring structure for ignition effectiveness, abnormal flameout, and valve leakage, and further achieving comprehensive and precise safety and efficiency control of the whole biogas combustion process.
In combination with the hardware solution of the foregoing device, the present invention further provides a biogas combustion monitoring method based on the foregoing device architecture for implementation reference, and specifically, as shown in fig. 2, the method mainly includes the following steps:
step S1, after the preset ignition condition is reached, opening a valve to supply gas to an ignition unit of the biogas burner and triggering the ignition unit to execute ignition operation;
step S2, carrying out flame detection and/or temperature rise value detection on a combustion chamber of the biogas burner;
step S3, judging whether the ignition is successful according to the flame detection result and/or the temperature rise value detection result;
step S4, after the ignition is judged to be successful, continuously tracking the flame state in the combustion chamber of the biogas burner;
step S5, judging whether a combustion chamber of the biogas burner is flamed out or not according to the flame state;
step S6, after determining flameout (both normal and abnormal), closing the valve and continuously monitoring biogas flow data in the biogas conveying pipeline;
and step S7, judging whether biogas leakage occurs or not according to the biogas flow data.
It should be noted here that the preset ignition condition may be set as needed, for example, by monitoring whether the gas level data of the pressure stabilizing gas holder reaches a preset threshold, if so, the ignition operation may be performed within a preset time (for example, 60 seconds), and it may further be stated that, by using the temperature rise change and/or the flame state in the combustion chamber, it may be determined whether the ignition is successful, for example, the temperature rise value in 60 seconds does not reach the preset requirement and/or a flame signal is not detected, indicating that the ignition is failed, at this time, an ignition invalid warning message may be output in an alarm manner, and reset according to a certain time or a predetermined condition to monitor the ignition condition again for secondary auto-ignition, etc., which is not limited in the present invention; if the condition is not met, the biogas collection amount is not met, so that the gas level data can be continuously monitored, meanwhile, the gas flow data in the biogas conveying pipeline can be continuously monitored due to the fact that the gas supply valve is in the closed state at present, whether biogas leakage occurs or not is judged according to the biogas flow data, for example, when the gas level is monitored to be not met with the preset low limit value, but a flow indication value exists in a pipeline connected to a biogas burner is monitored, the situation that leakage exists at a high probability is indicated, and at the moment, leakage alarm information can be output to attract attention. That is, the preferred concept is to monitor leakage in real time before ignition, in addition to extinguishing and tracking line flow after closing the valve as mentioned in step S7.
In addition, as mentioned above, during the combustion process after the ignition of the biogas burner is successful, gas supply regulation and control can be performed by continuously monitoring the gas level data of the pressure stabilizing gas tank, for example, the gas level indication exceeds a certain preset high limit value, which indicates that the pressure stabilizing gas tank collects more biogas to be processed, at this time, the valve opening can be increased, the gas supply amount is increased to accelerate the consumption of the biogas, and once the gas level indicates that the current collection amount is lower than a certain preset low limit value, which indicates that the biogas collected in the pressure stabilizing gas tank is completely consumed by combustion, and no reburning is needed, at this time, the gas supply valve opening can be reduced or a normal automatic flameout control program can be decided to enter.
On the basis of the concept, it can be considered that in the combustion process after the ignition of the biogas burner is successful, the gas level data and the flame state are combined to determine whether the combustion chamber of the biogas burner is abnormally extinguished, for example, after the ignition is successful and the combustion stage is entered, a flame state signal is found to be lost, but the gas level at this time does not reach the lower limit value, it is indicated that an abnormality may occur, so that the combustion chamber is abnormally extinguished, at this time, an abnormal extinction alarm signal may be output, and the relevant valve is closed as described in the foregoing step S7 (the flow of the pipeline may also be monitored at this time, and the leakage event is continuously monitored).
In the embodiments of the present invention, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, and means that there may be three relationships, for example, a and/or B, and may mean that a exists alone, a and B exist simultaneously, and B exists alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" and similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one of a, b, and c may represent: a, b, c, a and b, a and c, b and c or a and b and c, wherein a, b and c can be single or multiple.
The structure, features and effects of the present invention have been described in detail with reference to the embodiments shown in the drawings, but the above embodiments are merely preferred embodiments of the present invention, and it should be understood that technical features related to the above embodiments and preferred modes thereof can be reasonably combined and configured into various equivalent schemes by those skilled in the art without departing from and changing the design idea and technical effects of the present invention; therefore, the invention is not limited to the embodiments shown in the drawings, and all the modifications and equivalent embodiments that can be made according to the idea of the invention are within the scope of the invention as long as they are not beyond the spirit of the description and the drawings.
Claims (10)
1. The utility model provides a marsh gas burning monitoring device, includes combustion controller (1), steady voltage gas holder (2), marsh gas combustor (3) and steady voltage gas holder (2) with marsh gas pipeline (4) between marsh gas combustor (3), its characterized in that still includes: a flow electric control instrument (5) arranged on the biogas conveying pipeline (4), a flame detector (6) arranged in a combustion chamber of the biogas combustor (3) and a temperature electric control instrument (7);
the flow electric control instrument (5), the flame detector (6) and the temperature electric control instrument (7) are respectively in electric signal connection with the combustion controller (1);
the flow electric control instrument (5) is used for monitoring biogas conveying flow data in the biogas conveying pipeline (4); the flame detector (6) is used for monitoring the flame combustion state in the biogas burner (3); the temperature electric control instrument (7) is used for monitoring the temperature change in the biogas burner (3).
2. The biogas combustion monitoring device according to claim 1, characterized in that the device further comprises a gas level meter (10) and a gas supply valve group (20) electrically connected with the combustion controller (1);
the gas level instrument (10) is arranged on the pressure stabilizing gas cabinet (2) and is used for monitoring the methane quantity of the pressure stabilizing gas cabinet (2);
the gas supply valve group (20) is arranged on the methane conveying pipeline (4) and used for adjusting and switching on and off the pressure stabilizing gas cabinet (2) to supply gas to the ignition unit of the methane burner (3).
3. The biogas combustion monitoring device according to claim 2, characterized in that the gas supply valve group (20) comprises a switch electromagnetic valve (21) and a proportional regulating valve (22) arranged in parallel on the biogas conveying pipeline (4);
the switching electromagnetic valve (21) is used for controlling the on-off of biogas supply, and the proportion adjusting valve (22) is used for adjusting the gas supply amount of the biogas supply.
4. Biogas combustion monitoring device according to claim 1, characterized in that the device further comprises an alarm module in electrical signal connection with the combustion controller (1), the alarm module being configured to output a warning signal.
5. Biogas combustion monitoring device according to claim 4, characterized in that the alarm module is integrated in an upper computer (100) in electrical signal connection with the combustion controller (1).
6. The biogas combustion monitoring device according to any one of claims 1 to 5, wherein the flame detector (6) adopts any one of the following: ultraviolet flame detector, infrared flame detector, ultraviolet and infrared mixed detector.
7. A biogas combustion monitoring method is characterized by comprising the following steps:
after the preset ignition condition is reached, opening a valve to supply gas to an ignition unit of the biogas burner and triggering the ignition unit to execute ignition operation;
detecting flame and/or temperature rise of a combustion chamber of the biogas burner;
judging whether the ignition is successful or not according to the flame detection result and/or the temperature rise value detection result;
after the ignition is judged to be successful, continuously tracking the flame state in the combustion chamber of the biogas burner;
judging whether a combustion chamber of the biogas burner is flameout or not according to the flame state;
after flameout is judged, closing the valve and continuously monitoring biogas flow data in the biogas conveying pipeline;
and judging whether methane leakage occurs or not according to the methane flow data.
8. Biogas combustion monitoring method according to claim 7, characterized in that the preset ignition conditions comprise:
monitoring whether the air level data of the pressure stabilizing air cabinet reaches a preset threshold value;
if yes, executing ignition operation within preset time;
if not, continuously monitoring biogas flow data in the biogas conveying pipeline while monitoring the gas level data;
and judging whether methane leakage occurs or not according to the methane flow data.
9. Biogas combustion monitoring method according to claim 7, characterized in that the method further comprises:
continuously monitoring the gas level data of the pressure-stabilizing gas holder in the combustion process after the ignition of the biogas burner is successful;
and adjusting the gas supply amount to the biogas burner according to the gas level data and deciding whether to enter a normal flameout program.
10. The biogas combustion monitoring method of claim 9, wherein the method further comprises:
judging whether the combustion chamber of the biogas burner is abnormally extinguished or not by combining the gas level data and the flame state;
and if the abnormal flameout is judged to occur, outputting an abnormal flameout alarm signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110485459.5A CN113091062A (en) | 2021-04-30 | 2021-04-30 | Biogas combustion monitoring device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110485459.5A CN113091062A (en) | 2021-04-30 | 2021-04-30 | Biogas combustion monitoring device and method |
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| CN113091062A true CN113091062A (en) | 2021-07-09 |
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| CN202110485459.5A Pending CN113091062A (en) | 2021-04-30 | 2021-04-30 | Biogas combustion monitoring device and method |
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