CN111412069A - Control method and control system for fuel gas heat value variable quantity - Google Patents
Control method and control system for fuel gas heat value variable quantity Download PDFInfo
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- CN111412069A CN111412069A CN202010366786.4A CN202010366786A CN111412069A CN 111412069 A CN111412069 A CN 111412069A CN 202010366786 A CN202010366786 A CN 202010366786A CN 111412069 A CN111412069 A CN 111412069A
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- fuel gas
- control valve
- variation
- control
- calorific value
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
- F02C9/26—Control of fuel supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/22—Fuel supply systems
- F02C7/232—Fuel valves; Draining valves or systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Feeding And Controlling Fuel (AREA)
Abstract
The invention discloses a control method and a control system for the calorific value variation of fuel gas, belonging to the technical field of fuel gas engines and comprising the following steps: determining the heat value variation range of the fuel gas; taking the flow variation of the control valve as a measurement deviation correction quantity; controlling the aperture and the number of the air inlet holes, and enabling the measurement deviation correction quantity in the full stroke range to be larger than the fuel gas heat value variation quantity; the fuel gas flow in the regulating control valve, and then rectify a fuel gas calorific value variation, confirm a calorific value change range of fuel gas, design through carrying out the trompil on the valve at the control valve, design the quantity and the diameter of inlet port, and the fuel gas flow in the regulating control valve leads to the flow, and then rectify a fuel gas calorific value variation, the flow of control fuel gas, and according to the change of fuel gas calorific value, rectify an angle of regulation to the valve, thereby reach the purpose of control fuel gas calorific value variation, overcome because of there is the problem of the stability of great difference influence burning in the fuel gas calorific value.
Description
Technical Field
The invention belongs to the technical field of gas engines, and particularly relates to a control method and a control system for fuel gas heat value variation.
Background
With the progress of economy and the development of society, fuel gas, which is a general term for gas fuel, can be combusted to release heat for residents and industrial enterprises. The gas is various, mainly including natural gas, artificial gas, liquefied petroleum gas, biogas and coal gas, wherein after the supply of the artificial gas is greatly increased in 1990, the artificial gas is in a slow increasing stage due to the defects of high pollution, high toxicity and the like; the liquefied petroleum gas is influenced by the rising of the petroleum price, and the supply quantity is kept stable; compared with gasoline and diesel oil, the price of the natural gas with the same heat value is 30-50% lower, the natural gas has obvious economy, meanwhile, the country pays more and more attention to environmental protection, the market continuously increases the demand of clean energy, and the natural gas is used as clean, efficient and cheap energy, so that the consumption of the natural gas is rapidly developed.
The calorific values of different fuel gases are often greatly different, but the calorific value of a combustible gas is relatively stable in a certain period, so that in order to stabilize and improve the combustion condition of the gas turbine, it is necessary to monitor and control the calorific value of the fuel, and to provide a control method capable of controlling the variation of the calorific value of the fuel gas.
Disclosure of Invention
The invention aims to solve the technical problem that the heat value of fuel gas has larger difference to influence the combustion stability in the prior art, and provides a control method of the heat value variation of the fuel gas, wherein the variation of the fuel gas components is called the heat value variation of the fuel gas or the variation of the fuel gas components; in order to control the variation of the fuel gas components, the patent designs a deviation correcting quantity provided by a valve controlled by an electric actuating mechanism or a hydraulic driving mechanism to compensate the heat value of the fuel gas.
The invention is realized by the following technical scheme:
a control method for the variation of the calorific value of fuel gas comprises the following steps:
s1, determining the heat value change range of the fuel gas; although the heating values of different fuel gases tend to vary widely, the change in heating value for a particular combustible gas is relatively constant over a period of time, so that we can determine the range of changes in heating value of the fuel gas over a period of time.
S2, taking the flow variation of the control valve as a measurement deviation correcting quantity, and designing according to the heat value change caused by the component change of the used fuel gas when the deviation correcting quantity is measured, wherein the set deviation correcting quantity range can be determined because the heat value change of a specific fuel gas in a certain range is an inherent range;
s3, controlling the aperture and the number of the air inlets, axially arranging a plurality of air inlets on a valve of the control valve, determining the aperture and the number of the air inlets according to requirements, and enabling the measurement correction quantity in the full stroke range to be larger than the fuel gas heat value variation quantity;
s4, adjusting the circulation flow of the fuel gas in the control valve, adjusting the angle of the valve through an electric actuating mechanism or a hydraulic actuating mechanism, and further adjusting and controlling the circulation flow of the control valve, so that the deviation of the variation of the calorific value of the fuel gas is corrected.
Further preferably, the method for controlling the flow variation of the valve comprises the following steps: when the heat value of the fuel gas is changed, the flow area of the fuel gas is adjusted by adjusting the angle of the valve plate, when the heat value is reduced, the flow area is increased, otherwise, the flow area is reduced; when the measurement deviation correction amount in the full stroke range is smaller than the variation of the fuel gas heat value, adjusting the control valve and increasing the flow rate of the control valve; when the measurement deviation in the full stroke range is larger than the variation of the heat value of the fuel gas, the control valve is adjusted, and the flow rate of the control valve is reduced.
Further preferably, the control valve is controlled by an electric driving mechanism, and the electric driving mechanism comprises a controller as a control end and a driving motor for supplying power.
According to the further optimization of the invention, a plurality of air inlets are formed on a valve plate of the control valve, and the diameters and the number of the air inlets are determined according to the target deviation correction amount and the cross section size of the control valve.
A control system for the variation of the calorific value of fuel gas comprises a control valve, wherein a plurality of air inlets are formed in a valve plate of the control valve, and the control system executes the steps in any control method for the variation of the calorific value of the fuel gas.
Further preferably, the adjusting of the fuel gas flow rate variation in the control valve comprises the steps of: when the measurement deviation correction amount in the full stroke range is smaller than the variation of the fuel gas heat value, adjusting the control valve and increasing the flow rate of the control valve; when the measurement deviation in the full stroke range is larger than the variation of the heat value of the fuel gas, the control valve is adjusted, and the flow rate of the control valve is reduced. And the control valve is controlled by an electric driving mechanism or a hydraulic driving mechanism.
Further preferably, the electric driving mechanism includes a controller as a control end and a driving motor for supplying power.
Further preferably, the hydraulic drive mechanism control comprises a controller as a control end and a hydraulic machine for providing power.
According to the further optimization of the invention, a plurality of air inlets are formed on a valve plate of the control valve, and the diameters and the number of the air inlets are determined according to the target deviation correction amount and the cross section size of the control valve.
The working principle is as follows: determining the heat value variation range of the fuel gas; the flow variation of the control valve is used as a measurement deviation correcting amount, and the measurement deviation correcting amount is designed according to the heat value change caused by the component change of the used fuel gas, because the heat value change of a specific fuel gas in a certain range is an inherent range, the set deviation correcting amount range can be determined; controlling the aperture and the number of the air inlet holes, and enabling the measurement deviation correction quantity in the full stroke range to be larger than the fuel gas heat value variation quantity; and adjusting the flow of the fuel gas in the control valve so as to correct the variation of the calorific value of the fuel gas.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention firstly determines a range of variation of heat value of fuel gas, designs the number and diameter of air inlet holes by designing an opening on a valve of a control valve and utilizing the measurement deviation correction quantity in the full stroke range to be larger than the variation of the heat value of the fuel gas, and adjusts the flow rate of fuel air in the control valve so as to correct the variation of the heat value of the fuel gas.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a flow chart of the control of the variation in the heating value of fuel gas according to the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, it is to be understood that the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the scope of the present invention.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The present invention will be described in detail with reference to FIG. 1
The first embodiment is as follows: a control method for the variation of the calorific value of fuel gas comprises the following steps:
s1, determining the heat value change range of the fuel gas; although the heating values of different fuel gases tend to vary widely, the change in heating value for a particular combustible gas is relatively constant over a period of time, so that we can determine the range of changes in heating value of the fuel gas over a period of time.
S2, taking the flow variation of the control valve as a measurement deviation correcting quantity, and designing according to the heat value change caused by the component change of the used fuel gas when the deviation correcting quantity is measured, wherein the set deviation correcting quantity range can be determined because the heat value change of a specific fuel gas in a certain range is an inherent range;
s3, controlling the aperture and the number of the air inlets, axially arranging a plurality of air inlets on a valve of the control valve, determining the aperture and the number of the air inlets according to requirements, and enabling the measurement correction quantity in the full stroke range to be larger than the fuel gas heat value variation quantity;
s4, adjusting the circulation flow of the fuel gas in the control valve, adjusting the angle of the valve through an electric actuating mechanism or a hydraulic actuating mechanism, and further adjusting and controlling the circulation flow of the control valve, so that the deviation of the variation of the calorific value of the fuel gas is corrected.
The flow variation of the control valve comprises the following steps: when the heat value of the fuel gas is changed, the flow area of the fuel gas is adjusted by adjusting the angle of the valve plate, when the heat value is reduced, the flow area is increased, otherwise, the flow area is reduced; when the measurement deviation correction amount in the full stroke range is smaller than the variation of the fuel gas heat value, adjusting the control valve and increasing the flow rate of the control valve; when the measurement deviation in the full stroke range is larger than the variation of the heat value of the fuel gas, the control valve is adjusted, and the flow rate of the control valve is reduced.
The control valve is controlled by an electric driving mechanism, and the electric driving mechanism comprises a controller serving as a control end and a driving motor for providing power.
And a plurality of air inlets are formed in a valve plate of the control valve, and the diameter and the number of the air inlets are determined according to the target deviation correction amount and the cross section size of the control valve.
The second embodiment: a control system for the variation of the calorific value of fuel gas comprises a control valve, wherein a plurality of air inlets are formed in a valve plate of the control valve, and the control system executes the steps in any control method for the variation of the calorific value of the fuel gas.
The control valve is controlled by an electric driving mechanism or a hydraulic driving mechanism, and the angle of the valve of the control valve is adjusted by the electric driving mechanism and the hydraulic driving mechanism, so that the fuel gas flow in the control valve is corrected.
The working principle is as follows: determining the heat value variation range of the fuel gas; the flow variation of the control valve is used as a measurement deviation correcting amount, and the measurement deviation correcting amount is designed according to the heat value change caused by the component change of the used fuel gas, because the heat value change of a specific fuel gas in a certain range is an inherent range, the set deviation correcting amount range can be determined; controlling the aperture and the number of the air inlet holes, and enabling the measurement deviation correction quantity in the full stroke range to be larger than the fuel gas heat value variation quantity; and adjusting the flow of the fuel gas in the control valve so as to correct the variation of the calorific value of the fuel gas.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for controlling the variation of the calorific value of fuel gas is characterized by comprising the following steps:
s1, determining the heat value change range of the fuel gas;
s2, taking the flow variation of the control valve as a measurement deviation correction quantity;
s3, controlling the aperture and the number of the air inlet holes, and enabling the measurement deviation correction quantity in the full stroke range to be larger than the fuel gas heat value variation quantity;
and S4, adjusting the circulation flow of the fuel gas in the control valve, and further correcting the variation of the calorific value of the fuel gas.
2. The control method of controlling the amount of correction according to claim 1, characterized in that adjusting the change in the flow rate of fuel gas flowing in the control valve includes the steps of:
when the measurement deviation correction amount in the full stroke range is smaller than the variation of the fuel gas heat value, adjusting the control valve and increasing the flow rate of the control valve;
when the measurement deviation in the full stroke range is larger than the variation of the heat value of the fuel gas, the control valve is adjusted, and the flow rate of the control valve is reduced.
3. The control method of controlling the amount of correction according to claim 1, wherein the control valve is controlled by an electric drive mechanism including a controller as a control end and a drive motor that supplies power.
4. The control method for controlling the deviation rectification amount according to claim 1, wherein a plurality of air inlet holes are formed in a valve plate of the control valve, and the diameters and the number of the air inlet holes are determined according to the target deviation rectification amount and the size of the cross section of the control valve.
5. A control system for the calorific value variation of fuel gas is characterized by comprising a control valve, wherein a valve plate of the control valve is provided with a plurality of air inlets; and adjusting the flow of the fuel gas in the control valve so as to correct the variation of the calorific value of the fuel gas.
The control system performs the steps of the control method of the calorific value variation of fuel gas according to any one of claims 1 to 4 above.
6. The fuel gas heating value variation driving mechanism according to claim 5, wherein adjusting the fuel gas circulation flow rate variation in the control valve comprises the steps of:
when the measurement deviation correction amount in the full stroke range is smaller than the variation of the fuel gas heat value, adjusting the control valve and increasing the flow rate of the control valve;
when the measurement deviation in the full stroke range is larger than the variation of the heat value of the fuel gas, the control valve is adjusted, and the flow rate of the control valve is reduced.
7. The drive mechanism for the variation in the calorific value of fuel gas of claim 5, wherein said control valve is controlled by an electric drive mechanism or a hydraulic drive mechanism.
8. The fuel gas heating value variation driving mechanism according to claim 7, wherein the electric driving mechanism includes a controller as a control terminal and a driving motor for supplying power.
9. The driving mechanism for the calorific value variation of fuel gas according to claim 7, wherein the hydraulic driving mechanism control comprises a controller as a control end and a hydraulic machine for supplying power.
10. The mechanism for driving the calorific value of fuel gas according to claim 5, wherein a plurality of air inlets are formed in a valve plate of the control valve, and the diameters and the number of the air inlets are determined according to the target deviation correction amount and the cross-sectional size of the control valve.
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| CN202010366786.4A CN111412069B (en) | 2020-04-30 | 2020-04-30 | Control method and control system for fuel gas heat value variable quantity |
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| CN202010366786.4A CN111412069B (en) | 2020-04-30 | 2020-04-30 | Control method and control system for fuel gas heat value variable quantity |
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| CN111412069B CN111412069B (en) | 2021-05-18 |
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Citations (7)
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| JPS58220928A (en) * | 1982-06-18 | 1983-12-22 | Toshiba Corp | Control method for starting gas turbine |
| CN1506612A (en) * | 2002-09-12 | 2004-06-23 | Fluid sprayer and spraying method | |
| CN201810401U (en) * | 2010-08-13 | 2011-04-27 | 北京中矿科能煤炭地下气化技术研究中心 | Gas caloric value allocation device in underground coal deployment combined-cycle power plant system |
| CN102562320A (en) * | 2010-11-03 | 2012-07-11 | 通用电气公司 | Systems, methods, and apparatus for compensating fuel composition variations in a gas turbine |
| CN104903563A (en) * | 2012-12-03 | 2015-09-09 | 西门子公司 | Method and arrangement for controlling fuel supply for gas turbine |
| CN110361418A (en) * | 2019-07-03 | 2019-10-22 | 华电通用轻型燃机设备有限公司 | The real-time calorific value forecast analysis device and method of natural gas |
| CN110925793A (en) * | 2019-12-27 | 2020-03-27 | 广州智光节能有限公司 | Fuel calorific value control device and control method of multi-gas-source gas turbine |
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2020
- 2020-04-30 CN CN202010366786.4A patent/CN111412069B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58220928A (en) * | 1982-06-18 | 1983-12-22 | Toshiba Corp | Control method for starting gas turbine |
| CN1506612A (en) * | 2002-09-12 | 2004-06-23 | Fluid sprayer and spraying method | |
| CN201810401U (en) * | 2010-08-13 | 2011-04-27 | 北京中矿科能煤炭地下气化技术研究中心 | Gas caloric value allocation device in underground coal deployment combined-cycle power plant system |
| CN102562320A (en) * | 2010-11-03 | 2012-07-11 | 通用电气公司 | Systems, methods, and apparatus for compensating fuel composition variations in a gas turbine |
| CN104903563A (en) * | 2012-12-03 | 2015-09-09 | 西门子公司 | Method and arrangement for controlling fuel supply for gas turbine |
| CN110361418A (en) * | 2019-07-03 | 2019-10-22 | 华电通用轻型燃机设备有限公司 | The real-time calorific value forecast analysis device and method of natural gas |
| CN110925793A (en) * | 2019-12-27 | 2020-03-27 | 广州智光节能有限公司 | Fuel calorific value control device and control method of multi-gas-source gas turbine |
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