CN217473189U - High-precision fuel gas follow-up flow heat value control system - Google Patents
High-precision fuel gas follow-up flow heat value control system Download PDFInfo
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- CN217473189U CN217473189U CN202221098665.7U CN202221098665U CN217473189U CN 217473189 U CN217473189 U CN 217473189U CN 202221098665 U CN202221098665 U CN 202221098665U CN 217473189 U CN217473189 U CN 217473189U
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Abstract
The utility model discloses a gas follow-up flow calorific value control system of high accuracy, including gas governing valve, the air governing valve and the governing valve of admitting air of gas, gas governing valve one end of admitting air is provided with the gas flowmeter, gas flowmeter one end is provided with gas flowmeter, be provided with the proportional valve between gas flowmeter and the gas flowmeter, gas flowmeter one end is provided with the governing valve, governing valve one end is provided with the gas measurement meter, gas measurement meter one end is provided with the calorific value measuring apparatu, gas governing valve one side of admitting air is provided with the air governing valve of admitting air. The utility model discloses a two return circuits cascade control mode, no matter natural gas flow and air mass flow measurement accuracy can not satisfy the control requirement or the gas calorific value is undulant, can not influence the mixing precision.
Description
Technical Field
The utility model relates to a natural gas application technology field, in particular to gas follow-up flow calorific value control system of high accuracy.
Background
In natural gas applications, gas and air are typically mixed to adjust the characteristics of the gas, and the systems include gas valves, gas flow meters, air valves, air pressure regulators, air flow meters, air regulating valves, static mixers, as well as thermal value analyzers, and control systems.
At present, the mixing effect of the gas mixing system is determined by hardware facilities of the gas mixing system and most critical control modes adopted by the system.
The existing high-precision gas follow-up flow heat value control system has the following defects that: the mixing precision is difficult to guarantee, when the natural gas flow and the air flow are smaller than the normal measuring range of the flowmeter, the measuring precision of the flowmeter cannot meet the control requirement at the moment, the mixing proportion cannot be guaranteed, and the heat value of the mixed gas cannot be accurately measured even if the mixing proportion is accurate due to fluctuation and variation of the heat value of the fuel gas, so that the high-precision mixing effect cannot be realized. Therefore, a high-precision fuel gas follow-up flow heat value control system is provided.
Disclosure of Invention
The utility model discloses a main aim at provides a gas follow-up flow calorific value control system of high accuracy can effectively solve the problem among the background art.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a gas follow-up flow calorific value control system of high accuracy, includes that the gas admits air governing valve, air admission governing valve and governing valve, gas admission governing valve one end is provided with the gas flowmeter, gas flowmeter one end is provided with gas flowmeter, be provided with the proportional valve between gas flowmeter and the gas flowmeter, gas flowmeter one end is provided with the governing valve, governing valve one end is provided with the gas measurement meter, gas measurement meter one end is provided with the calorific value measuring apparatu, gas admission governing valve one side is provided with the air admission governing valve.
Further, an air flow meter is arranged at one end of the air inlet adjusting valve, and one end of the air flow meter is connected to the proportional valve through a pipeline.
Furthermore, a first return pipe is arranged between the gas measuring meter and the regulating valve, and a second return pipe is arranged between the heat value measuring meter and the regulating valve.
Further, one end of the heat value measuring instrument is provided with an air outlet valve; the gas outlet valve is convenient for discharging the mixed gas.
Compared with the prior art, the utility model discloses following beneficial effect has:
through setting up the gas meter, a back flow, calorific value measuring apparatu and No. two back flows, the gas meter can detect the mist, control gas meter is closed and can be made the gas after mixing in back flow to the governing valve through a back flow, mix once more, the calorific value measuring apparatu can detect the calorific value of mist, personnel can control through controlgear and detect unqualified gas in back flow to the governing valve through No. two back flows, the gas meter constitutes the auxiliary circuit with a back flow, flow follow-up proportion is adjusted during, the major circuit is constituteed to calorific value measuring apparatu and No. two back flows, it adjusts to be the calorific value constant value, these two kinds of control mode can independent operation, also can adopt different control mode according to different operating modes.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the high-precision gas follow-up flow calorific value control system of the present invention.
In the figure: 1. a gas inlet regulating valve; 2. an air intake regulating valve; 3. adjusting a valve; 4. a gas meter; 5. a calorific value measuring instrument; 6. an air outlet valve; 7. a gas flow meter; 8. a proportional valve; 9. a gas flow meter; 10. an air flow meter; 11. a first return pipe; 12. a second reflux pipe.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following embodiments.
As shown in FIG. 1, a gas follow-up flow calorific value control system of high accuracy, includes gas governing valve 1, air governing valve 2 and governing valve 3 of admitting air, gas governing valve 1 one end of admitting air is provided with gas flowmeter 7, gas flowmeter 7 one end is provided with gas flowmeter 9, be provided with proportional valve 8 between gas flowmeter 9 and the gas flowmeter 7, gas flowmeter 9 one end is provided with governing valve 3, governing valve 3 one end is provided with gas measurement meter 4, gas measurement meter 4 one end is provided with calorific value measuring apparatu 5, gas governing valve 1 one side of admitting air is provided with air governing valve 2.
Wherein, air intake governing valve 2 one end is provided with air flow meter 10, air flow meter 10 one end is passed through the pipe connection and is gone up on proportional valve 8.
In this embodiment, as shown in fig. 1, after the air intake adjusting valve 2 is opened, air enters the proportional valve 8 through the air flow meter 10.
Wherein, a first return pipe 11 is arranged between the gas meter 4 and the regulating valve 3, and a second return pipe 12 is arranged between the heat value measuring instrument 5 and the regulating valve 3.
In this embodiment, as shown in fig. 1, the gas meter 4 is controlled to be closed, so that the mixed gas can flow back into the regulating valve 3 through the first return pipe 11, and the personnel can control the gas which is detected to be unqualified to flow back into the regulating valve 3 through the second return pipe 12 by the control device.
Wherein, one end of the heat value measuring instrument 5 is provided with an air outlet valve 6.
In this embodiment, as shown in fig. 1, the gas outlet valve 6 facilitates the discharge of the mixed gas.
It should be noted that the utility model relates to a high accuracy gas follow-up flow calorific value control system, in operation, open gas inlet regulating valve 1 and make the natural gas flow to the governing valve 3 in through gas flowmeter 7, proportional valve 8 and gas flowmeter 9, open air inlet regulating valve 2 and make the air flow in the air flowmeter 10 gets into the proportional valve 8, the air flowmeter 10 can detect the flow of air, gas flowmeter 7 can detect the flow of natural gas, personnel control the angle of opening and shutting of proportional valve 8 through external control equipment, control the flow of natural gas and air, gas flowmeter 9 can detect the flow of natural gas and air once more, detect the difference of natural gas and air, personnel control the angle of opening and shutting of regulating valve 3 through control equipment, make the mixed gas discharge from air outlet valve 6 through gas meter 4 and calorific value 5, the gas measuring meter 4 can detect the gas mixture, control gas measuring meter 4 and close and to make the gas after mixing flow back to governing valve 3 in through a back flow pipe 11, mix once more, calorific value measuring meter 5 can detect the calorific value of gas mixture, personnel can control through controlgear and detect unqualified gas and flow back to governing valve 3 in through No. two back flow pipes 12, gas measuring meter 4 and a back flow pipe 11 constitute supplementary return circuit, the proportion regulation is followed up to the time flow, calorific value measuring meter 5 and No. two back flow pipes 12 constitute the major loop, be the calorific value constant value and adjust, these two kinds of control mode can operate independently, also can adopt different control mode according to different operating modes.
The flow follow-up proportional control mode is that the flow of the natural gas is measured, the natural gas is calculated according to the set mixing proportion, the corresponding air flow is obtained, the throughput of the adjusting valve is controlled, the air flow is equal to the calculated flow, the natural gas and the air are mixed proportionally, and the control system also continuously controls the opening of the adjusting valve along with the change of the natural gas flow, so that the air flow is changed according to the set proportion along with the flow of the natural gas.
The fixed heat value regulation is to compare the heat value of the mixed gas measured by the heat value meter with the set heat value, when the difference value is large, the large regulating value is used to control the opening degree of the regulating valve, when the difference value is small, the small regulating value is used to control the opening degree of the regulating valve, the regulating value is calculated according to the difference between the detected heat value and the set heat value and the size of the valve port of the regulating valve, in order to achieve the rapid and stable heat value, the rapid ripple-free mathematical model is used to realize the regulation process.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. The utility model provides a gas follow-up flow calorific value control system of high accuracy, includes gas governing valve (1), air governing valve (2) and governing valve (3) of admitting air, its characterized in that: gas governing valve (1) one end that admits air is provided with gas flowmeter (7), gas flowmeter (7) one end is provided with gas flowmeter (9), be provided with proportional valve (8) between gas flowmeter (9) and gas flowmeter (7), gas flowmeter (9) one end is provided with governing valve (3), governing valve (3) one end is provided with gas measurement meter (4), gas measurement meter (4) one end is provided with calorific value measuring apparatu (5), gas governing valve (1) one side that admits air is provided with air governing valve (2).
2. The high-precision gas follow-up flow heat value control system according to claim 1, characterized in that: and one end of the air inlet adjusting valve (2) is provided with an air flow meter (10), and one end of the air flow meter (10) is connected to the proportional valve (8) through a pipeline.
3. The high-precision gas follow-up flow heat value control system according to claim 1, characterized in that: a first return pipe (11) is arranged between the gas measuring meter (4) and the regulating valve (3), and a second return pipe (12) is arranged between the heat value measuring meter (5) and the regulating valve (3).
4. The high-precision gas follow-up flow heat value control system according to claim 1, characterized in that: and one end of the heat value measuring instrument (5) is provided with an air outlet valve (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221098665.7U CN217473189U (en) | 2022-05-10 | 2022-05-10 | High-precision fuel gas follow-up flow heat value control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221098665.7U CN217473189U (en) | 2022-05-10 | 2022-05-10 | High-precision fuel gas follow-up flow heat value control system |
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| CN217473189U true CN217473189U (en) | 2022-09-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117109313A (en) * | 2023-07-31 | 2023-11-24 | 凯盛君恒药玻(重庆)有限公司 | Kiln gas flow adjustment method and system and kiln |
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2022
- 2022-05-10 CN CN202221098665.7U patent/CN217473189U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117109313A (en) * | 2023-07-31 | 2023-11-24 | 凯盛君恒药玻(重庆)有限公司 | Kiln gas flow adjustment method and system and kiln |
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