CN216976520U - Mixed gas transmission and distribution system for natural gas and hydrogen - Google Patents
Mixed gas transmission and distribution system for natural gas and hydrogen Download PDFInfo
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- CN216976520U CN216976520U CN202220374643.2U CN202220374643U CN216976520U CN 216976520 U CN216976520 U CN 216976520U CN 202220374643 U CN202220374643 U CN 202220374643U CN 216976520 U CN216976520 U CN 216976520U
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Abstract
The utility model relates to a fuel gas mixing system, in particular to a mixed gas transmission and distribution system for natural gas and hydrogen, which comprises a natural gas metering flow control branch, a hydrogen metering flow control branch and a mixed gas mixing stable road; the natural gas metering flow control branch is connected with the hydrogen metering flow control branch in parallel and then is connected with the mixed gas mixing pressure stabilizing path through a gas transmission pipeline. The utility model is also connected with a control system; the control of mixed gas pressure and low heating value can be realized so as to meet the power generation requirement of the gas turbine. According to the utility model, the fuel gas and the hydrogen gas are mixed for hydrogen-doped combustion, so that the emission of carbon dioxide can be further reduced by using the hydrogen gas, the deep decarburization of the power system is realized, and the selection of fuels is more diversified in the using process of a customer. The utility model can achieve the purposes of full mixing of mixed gas, accurate mixing proportion and pressure control in system configuration and control, realizes the comprehensive utilization of hydrogen and has obvious practical and economic significance.
Description
Technical Field
The utility model relates to a fuel gas mixing system, in particular to a mixed gas transmission and distribution system for natural gas and hydrogen.
Background
The gas turbine is an internal combustion type power machine which takes continuously flowing gas as a working medium to drive an impeller to rotate at a high speed and converts the energy of fuel into useful work. Therefore, the gas turbine has a high demand for fluctuations in pressure, temperature, calorific value, and the like of the gas fuel. In recent years, hydrogen energy is a new trend of global energy transformation and development, and is one of the most promising energy sources. And natural gas and hydrogen are mixed for hydrogen-doped combustion, so that the emission of carbon dioxide can be further reduced by using the hydrogen, and the deep decarburization of the power system is realized. The blending system of natural gas and hydrogen gas has high requirements for controlling the pressure of the mixed gas and the low heating value of the mixed gas, and if the blending system is not operated properly, the whole blending system is lost.
SUMMERY OF THE UTILITY MODEL
In order to realize the purpose of natural gas and hydrogen gas mixed gas transmission and distribution, the utility model adopts the technical scheme that:
a mixed gas transmission and distribution system for natural gas and hydrogen comprises a natural gas metering flow control branch, a hydrogen metering flow control branch and a mixed gas mixing stable road;
the hydrogen metering flow control branch comprises a hydrogen flowmeter, one end of the hydrogen flowmeter is connected with a hydrogen source, and the other end of the hydrogen flowmeter is connected with a hydrogen mass flowmeter; the other end of the hydrogen mass flow meter is connected with a hydrogen flow control valve; the other end of the hydrogen flow control valve is connected with a hydrogen emergency shut-off valve; the other end of the hydrogen emergency shut-off valve is connected with a hydrogen DBB valve bank; the other end of the hydrogen DBB valve bank is connected with a mixed gas static mixer;
the mixed gas mixing pressure stabilizing circuit comprises a mixed gas static mixer, one end of the mixed gas static mixer is connected with the hydrogen DBB valve group and the natural gas metering flow control branch, and the other end of the mixed gas static mixer is connected with a mixed gas buffer tank; the other end of the mixed gas buffer tank is connected with a mixed gas pressure stabilizing valve; a mixed gas rapid heat value instrument is also connected between the mixed gas buffer tank and the mixed gas pressure stabilizing valve; the other end of the mixed gas pressure stabilizing valve is connected with a mixed gas emergency shut-off valve; and the other end of the mixed gas emergency shut-off valve is connected with the gas turbine.
The natural gas metering flow control branch and the hydrogen metering flow control branch are connected in parallel and then are connected with the mixed gas mixing pressure stabilizing path through a gas transmission pipeline.
Further, the mixed gas pressure stabilizing valve is a self-operated regulating valve.
Compared with the prior art, the utility model has the beneficial effects that:
the mixed gas transmission and distribution system for natural gas and hydrogen disclosed by the utility model realizes that the multi-parameter output value is within the allowable use range and within the allowable fluctuation rate range in system configuration and control, can achieve sufficient mixed gas mixing, accurate mixing proportion and pressure control, realizes comprehensive utilization of hydrogen, and has obvious practical and economic significance.
Drawings
FIG. 1 is a schematic view of the process of the present invention.
In the figure, 101, a natural gas online chromatograph; 102. a natural gas flow meter; 103. a natural gas flow control valve; 104. a natural gas emergency shut-off valve; 201. a hydrogen gas flow meter; 202. a hydrogen mass flow meter; 203. a hydrogen flow rate control valve; 204. a hydrogen emergency shut-off valve; 205. a hydrogen DBB valve bank; 301. a static mixer for the mixed gas; 302. a mixed gas buffer tank; 303. a mixed gas rapid heat value instrument; 304. a mixed gas pressure stabilizing valve; 305. the mixed gas emergency shutoff valve.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the natural gas metering flow control branch used in the present invention includes a natural gas online chromatograph 101, a natural gas flow meter 102, a natural gas flow control valve 103, and a natural gas emergency shut-off valve 104; the natural gas online chromatograph 101 is connected with the natural gas source at one end, and the other end is connected with natural gas flowmeter 102, and natural gas flowmeter 102 other end is connected with natural gas flow control valve 103, and the natural gas flow control valve 103 other end is connected with natural gas emergency shut-off valve 104, natural gas emergency shut-off valve 104 be connected with gas mixture static mixer 301.
The natural gas metering flow control branch is a conventional natural gas pressure regulating device.
The utility model also comprises a hydrogen metering flow control branch and a mixed gas mixing stable road; the hydrogen metering flow control branch comprises a hydrogen flowmeter 201, one end of the hydrogen flowmeter 201 is connected with a hydrogen source, and the other end of the hydrogen flowmeter 201 is connected with a hydrogen mass flowmeter 202; the other end of the hydrogen mass flow meter 202 is connected with a hydrogen flow control valve 203; the other end of the hydrogen flow control valve 203 is connected with a hydrogen emergency shut-off valve 204; the other end of the hydrogen emergency shut-off valve 204 is connected with a hydrogen DBB valve bank 205; the other end of the hydrogen DBB valve bank 205 is connected with a mixed gas static mixer 301; the mixed gas mixing pressure stabilizing circuit comprises a mixed gas static mixer 301, and the other end of the mixed gas static mixer 301 is connected with a mixed gas buffer tank 302; the other end of the mixed gas buffer tank 302 is connected with a mixed gas pressure stabilizing valve 304; a mixed gas rapid heating value instrument 303 is also connected between the mixed gas buffer tank 302 and the mixed gas pressure stabilizing valve 304; the other end of the mixed gas pressure stabilizing valve 304 is connected with a mixed gas emergency shut-off valve 305; the other end of the mixture emergency shut-off valve 305 is connected to the gas turbine.
The natural gas metering flow control branch is connected with the hydrogen metering flow control branch in parallel and then is connected with the mixed gas mixing pressure stabilizing path through a gas transmission pipeline. The natural gas and hydrogen mixed gas transmission and distribution system is connected with the existing control system of an enterprise.
In actual operation, for the mixed gas pressure control:
theoretically, the closer the pressures of natural gas and hydrogen are, the easier the calorific value control is; the greater the difference in pressure between natural gas and hydrogen, the more difficult the control of the heating value. Therefore, the operating pressures of the two gases before entering the static mixer 301 and the buffer tank 302 are kept as close as possible and within a small range, usually about 0.5 kg. Meanwhile, the mixed gas pressure stabilizing valve 304 adopts a self-operated mechanical structure, has high pressure regulating precision, good reliability and high stability, usually has a reaction time of less than or equal to 1 second, can further regulate and stabilize the pressure of the mixed gas, and meets the fluctuation requirement of the gas turbine on the pressure of the mixed gas.
In practical work, for the mixed gas low heating value control:
during the startup and shutdown of the gas turbine, 100% natural gas is required, and the blending system can complete the switching between natural gas and mixed gas within the specified load range. The natural gas flow control valve 103 maintains the flow of the natural gas passing through, and the hydrogen flow control valve 203 is slowly adjusted.
1. Inputting data of a control system by combining the natural gas online chromatograph 101, the natural gas flowmeter 102, the hydrogen mass flowmeter 202 and the mixed gas rapid heat value meter 303, setting a mixed target heat value and calculating a theoretically required hydrogen flow; methods for calculating the theoretically required hydrogen flow are well known to those skilled in the art.
2. The natural gas flow meter 102 and the hydrogen flow meter 201 are used for measuring the flow meter signals and the volume percentage, the opening rate of the hydrogen flow control valve 203 is regulated, the natural gas flow meter and the hydrogen flow control valve enter a static mixing system, and the mixed gas static mixer 301 is used for uniformly mixing the two gases to slowly reach the target heat value of the mixed gas; the opening rate of the hydrogen flow control valve 203 may be calculated according to the volume of the gas mixture system and the characteristic curve theory of the opening degree of the hydrogen flow control valve 203 and the through flow rate, and the calculation method is well known to those skilled in the art. The mixed gas buffer tank 302 may appropriately expand the volume of the mixed gas system, in addition to the function of promoting uniform mixing of the gases.
3. Meanwhile, the mixed gas rapid heat value instrument 303 actually measures the outlet heat value of the mixed gas as a feedback signal to protect and limit the opening and the speed of the hydrogen flow control valve 203, namely, fine adjustment is carried out according to a theoretical hydrogen flow value and an actually measured hydrogen flow value, and then the requirements of the gas turbine on the heat value speed and the mixing proportion are met. The control functions of detecting and correcting the opening degrees of the natural gas flow control valve 103 and the hydrogen flow control valve 203 by the mixed gas rapid heating value instrument 303 are realized in the control system.
4. The reaction speed of the mixed gas rapid heat value instrument 303 directly influences the control of the heat value, the faster the reaction speed is, the easier the control of the heat value is in time, and the higher the accuracy of the heat value of the mixed gas is; the mixed gas rapid heating value meter 303 is required to have excellent measurement characteristics such as extremely short response time and extremely high measurement accuracy.
Meanwhile, the mixed gas rapid heat value instrument 303 monitors and alarms the safety range of the mixed gas, wherein the safety range is generally 24.66-38.14MJ/Nm 3; the hydrogen flow control valve 203 needs to have a quick closing function. In combination with the change condition of the load of the gas turbine, the control system opens and closes corresponding regulating valves, thereby ensuring the safe operation of the combustion engine;
in actual work, for automatic separation and manual separation of a blending device system:
the natural gas emergency shutdown valve 104, the hydrogen emergency shutdown valve 204, and the mixture emergency shutdown valve 305 are set to automatic for safe and reliable operation of the system and for gas turbine operation mode requirements.
The hydrogen DBB valve group 205 is arranged manually and arranged at the main outlet of the hydrogen branch, so that effective isolation can be realized, and natural gas and hydrogen gas channeling can be avoided.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. The utility model provides a gas mixing transmission and distribution system for natural gas hydrogen, includes natural gas measurement flow control branch road, its characterized in that: the hydrogen gas mixing and stabilizing device also comprises a hydrogen gas metering flow control branch and a mixed gas mixing and stabilizing road;
the hydrogen metering flow control branch comprises a hydrogen flowmeter (201), one end of the hydrogen flowmeter (201) is connected with a hydrogen source, and the other end of the hydrogen flowmeter (201) is connected with a hydrogen mass flowmeter (202); the other end of the hydrogen mass flow meter (202) is connected with a hydrogen flow control valve (203); the other end of the hydrogen flow control valve (203) is connected with a hydrogen emergency shut-off valve (204); the other end of the hydrogen emergency shut-off valve (204) is connected with a hydrogen DBB valve group (205); the other end of the hydrogen DBB valve group (205) is connected with a mixed gas static mixer (301);
the mixed gas mixing pressure stabilizing circuit comprises a mixed gas static mixer (301), one end of the mixed gas static mixer (301) is connected with a hydrogen DBB valve bank (205) and a natural gas metering flow control branch, and the other end of the mixed gas static mixer is connected with a mixed gas buffer tank (302); the other end of the mixed gas buffer tank (302) is connected with a mixed gas pressure stabilizing valve (304); a mixed gas rapid heating value instrument (303) is also connected between the mixed gas buffer tank (302) and the mixed gas pressure stabilizing valve (304); the other end of the mixed gas pressure stabilizing valve (304) is connected with a mixed gas emergency shut-off valve (305); the other end of the mixed gas emergency shut-off valve (305) is connected with a gas turbine;
the natural gas metering flow control branch is connected with the hydrogen metering flow control branch in parallel and then is connected with the mixed gas mixing pressure stabilizing path through a gas transmission pipeline.
2. The gas mixing transmission and distribution system for natural gas and hydrogen as claimed in claim 1, wherein: the mixed gas pressure stabilizing valve (304) is a self-operated regulating valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220374643.2U CN216976520U (en) | 2022-02-18 | 2022-02-18 | Mixed gas transmission and distribution system for natural gas and hydrogen |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220374643.2U CN216976520U (en) | 2022-02-18 | 2022-02-18 | Mixed gas transmission and distribution system for natural gas and hydrogen |
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| CN216976520U true CN216976520U (en) | 2022-07-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115686082A (en) * | 2022-10-11 | 2023-02-03 | 中国航发燃气轮机有限公司 | Intelligent gas distribution system for unstable heat value combustible gas of gas turbine |
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2022
- 2022-02-18 CN CN202220374643.2U patent/CN216976520U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115686082A (en) * | 2022-10-11 | 2023-02-03 | 中国航发燃气轮机有限公司 | Intelligent gas distribution system for unstable heat value combustible gas of gas turbine |
| CN115686082B (en) * | 2022-10-11 | 2024-05-07 | 中国航发燃气轮机有限公司 | Non-stable heat value combustible gas intelligent gas distribution system for gas turbine |
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