CN213680558U - Gas mixing system for power station - Google Patents
Gas mixing system for power station Download PDFInfo
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- CN213680558U CN213680558U CN202022004441.2U CN202022004441U CN213680558U CN 213680558 U CN213680558 U CN 213680558U CN 202022004441 U CN202022004441 U CN 202022004441U CN 213680558 U CN213680558 U CN 213680558U
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Abstract
The utility model relates to a gas mixing system, in particular to gas mixing system for power station. The device comprises a natural gas filtering and heating metering flow control branch, a control system, a synthesis gas filtering and metering flow control branch and a mixed gas mixing stable road. The natural gas filtering and heating metering flow control branch and the synthesis gas filtering and metering flow control branch are connected in parallel and then are connected with a mixed gas mixing stable road and a control system through a gas pipeline. And setting the parameter range in each branch module according to the gas transmission requirements of the gas turbines of different models so as to meet the power generation requirements of the gas turbines of different models. The application utilizes the low-heat value and low-cost synthesis gas of the petrochemical refinery plant to burn and generate electricity, is favorable for reducing the use cost of natural gas, realizes the maximization of the economic benefit and the social benefit of the gas fuel electricity generation industry, and simultaneously ensures that the selection of fuel is more diversified in the use process of customers.
Description
Technical Field
The utility model relates to a gas mixing system, in particular to natural gas and synthetic gas mixing system.
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, the natural gas pressure regulating device with a single working medium is widely and mature for gas turbine power generation and is applied to large-scale power plants at home and abroad. On the other hand, the cost of the natural gas with a single working medium is high, so that the cost of enterprises is increased and the economic benefit is reduced.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, improve enterprise economic interests, reduce cost, the utility model aims to how mix low heat value, the low-cost synthetic gas furthest's of petrochemical refining mill to the natural gas in, reduce the system of high heat value, the consumption of high-cost natural gas fuel.
In order to realize the purpose, the utility model discloses a technical scheme is:
a fuel gas mixing system for a power station comprises a natural gas filtering and heating metering flow control branch, a control system, a synthesis gas filtering and metering flow control branch and a mixed gas mixing stable road;
the synthesis gas filtering and metering flow control branch comprises a synthesis gas emergency shut-off valve, a synthesis gas filter, a synthesis gas pressure stabilizing valve, a synthesis gas online chromatograph, a synthesis gas flowmeter and a synthesis gas flow control valve, wherein one end of the synthesis gas emergency shut-off valve is connected with one end of the synthesis gas filter through a gas transmission pipeline, the other end of the synthesis gas filter is connected with one end of the synthesis gas pressure stabilizing valve through a gas transmission pipeline, the other end of the synthesis gas pressure stabilizing valve is connected with one end of the synthesis gas online chromatograph through a gas transmission pipeline, the other end of the synthesis gas online chromatograph is connected with one end of the synthesis gas flowmeter through a gas transmission pipeline, the other end of the synthesis gas flowmeter is connected with one end of the synthesis gas flow control valve through a gas transmission pipeline, and the other end of the synthesis gas;
the mixed gas mixing pressure stabilizing circuit comprises a mixed gas static mixer, a mixed gas buffer tank, a mixed gas rapid heat value instrument, a mixed gas pressure stabilizing valve and a mixed gas emergency shut-off valve, wherein one end of the mixed gas static mixer is respectively connected with a natural gas flow control valve and a synthetic gas flow control valve through a gas transmission pipeline, the other end of the mixed gas static mixer is connected with the mixed gas buffer tank through a gas transmission pipeline, the other end of the mixed gas buffer tank is connected with the mixed gas rapid heat value instrument through a gas transmission pipeline, the other end of the mixed gas rapid heat value instrument is connected with the mixed gas pressure stabilizing valve through a gas transmission pipeline, the other end of the mixed gas pressure stabilizing valve is connected with one end of the mixed gas emergency shut-off valve through a gas transmission pipeline, and the other end of the mixed gas emergency shut-off valve.
The natural gas filtering and heating metering flow control branch is connected with the synthesis gas filtering and metering flow control branch in parallel and then is connected with the mixed gas mixing stable road and the control system through a gas pipeline.
Further, the fuel gas is mixed by mixing natural gas and fuel gas with different components uniformly.
Further, the gas supply pressure at the natural gas inlet is 36-37barg, the inlet temperature is 0-5 ℃, and the flow rate is 60000Nm3H, syngas inlet feed pressure: 41-60barg, inlet temperature 30-40 deg.C, and flow rate 40000Nm3/h。
Further, the output pressure of the fuel gas blending system for the power station is as follows: 31barg, the fluctuation change rate dp/t is less than or equal to 0.2 bar/s;
output temperature range: at 24-29 ℃, the fluctuation change rate dT/dT is less than or equal to 1K/s;
output Low White Index (LWI) range: 31.6-49.0MJ/Nm3, and the fluctuation change rate dLWI/dt is less than or equal to 0.1%/s;
the output low heat value range is 24.66-38.14MJ/Nm3, and the fluctuation change rate is less than or equal to 0.09%/s;
h2 volume percent is less than or equal to 21 percent; the volume percentage of CO is less than or equal to 27 percent;
load limitation of blended combustion syngas gas-fired machine: blending is only allowed in the 60% -90% load range, 100% natural gas is required during engine start-up and shut-down;
and (3) limitation of blending proportion: the volume mixing ratio of the natural gas to the synthetic gas is less than or equal to 1: 1.
compared with the prior art, the beneficial effects of the utility model are that:
the low-heat value and low-cost synthesis gas of a petrochemical refinery plant is combusted and generated, so that the use cost of natural gas is reduced, the maximization of economic benefit and social benefit of the gas fuel power generation industry is realized, and the selection of fuel is diversified in the use process of a customer.
In the aspect of system configuration and control, the multi-parameter output value is realized within an allowable use range and within an allowable fluctuation speed range, and the purposes of full mixing of mixed gas, accurate mixing proportion, temperature and pressure control can be achieved.
Drawings
FIG. 1 shows a schematic diagram of a gas blending system for a power plant.
In the figure, 1, a natural gas filtering and heating metering flow control branch; 101. a natural gas emergency shut-off valve; 102. a natural gas filter; 103. a natural gas heater; 104. a natural gas on-line chromatograph; 105. a natural gas flow meter; 106. a natural gas flow control valve; 2. a synthesis gas filtering and metering flow control branch; 201. a syngas emergency shutdown valve; 202. a syngas filter; 203 synthesis gas pressure maintaining valve; 204. an online chromatograph of the synthesis gas; 205. a syngas flow meter; 206. a syngas flow control valve; 3. mixing the mixed gas to stabilize the road; 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
The following describes embodiments of the present invention in detail with reference to the drawings.
The utility model discloses a natural gas filters heating measurement flow control branch 1 and includes natural gas emergency shutdown valve 101, natural gas filter 102, natural gas heater 103, natural gas online chromatograph 104, natural gas flowmeter 105, natural gas flow control valve 106, natural gas source is connected to natural gas emergency shutdown valve 101 one end, and one end is connected with natural gas filter 102, and the natural gas filter 102 other end is connected with natural gas heater 103, and the natural gas heater 103 other end is connected with natural gas online chromatograph 104, and the natural gas online chromatograph 104 other end is connected with natural gas flowmeter 105, and the natural gas flowmeter 105 other end is connected with natural gas flow control valve 106, and natural gas flow control valve 106 is connected with gas mixture static mixer 301.
Natural gas filtration heating measurement flow control branch road 1 be conventional natural gas pressure regulating device.
Example 1 a single siemens SGT5-2000E gas turbine engine with high requirements for fluctuations in pressure, temperature, heating value, etc. of the mixed gas fuel is preferably taken as an example.
The gas mixing device has the following index requirements:
1. output pressure: 31barg, the fluctuation change rate dp/t is less than or equal to 0.2 bar/s;
2. output temperature range: at 24-29 ℃, the fluctuation change rate dT/dT is less than or equal to 1K/s;
3. output Low White Index (LWI) range: 31.6-49.0MJ/Nm3The fluctuation change rate dLWI/dt is less than or equal to 0.1%/s;
4. the output low heat value range is 24.66-38.14MJ/Nm3The fluctuation rate is less than or equal to 0.09%/s
5. H2 and CO volume percent limit: respectively not more than 21% and 27%;
6. load limitation of blended combustion syngas gas-fired machine: blending is only allowed in the 60% -90% load range, 100% natural gas is required during engine start-up and shut-down;
7. and (3) limitation of blending proportion: allowing a maximum of 50% by volume blending (i.e. a maximum blending ratio of 1: 1 by volume of syngas to natural gas); the gas-mixed fuel is (synthesis gas vol: natural gas vol is less than or equal to 1: 1);
8. the boundary conditions have been determined: the gas supply pressure at the natural gas inlet is 36-37barg, the inlet temperature is 0-5 ℃, and the flow rate is 60000Nm3H, syngas inlet feed pressure: 41-60barg, inlet temperature 30-40 deg.C, and flow rate 40000Nm3H is used as the reference value. The outlet pressure of the mixed gas is 31barg, the outlet temperature is 24-29 ℃, and the flow rate is 77450Nm3/h；
9.1 natural gas reference composition:
9.2 syngas reference composition:
aiming at the gas transmission requirement of a single Siemens SGT5-2000E gas turbine, the working process of the gas blending system is explained as follows:
firstly, removing impurities from mixed gas:
the natural gas and the synthetic gas from the upstream pass through the natural gas filter 102 and the synthetic gas filter 202 respectively to remove particles and liquid drops in the gas, and the requirements of the gas turbine of the end user on the cleanliness of the gas mixture are met.
(II) controlling the temperature of the mixed gas:
the natural gas is separated, filtered and heated by a natural gas heater 103, so that the natural gas and the synthesis gas are as close as possible to each other and maintained at 28-40 ℃ before blending, the inlet temperature of the natural gas is 30 ℃ and the inlet temperature of the synthesis gas is 28 ℃.
(III) mixed gas pressure control:
the synthesis gas pressure is stabilized by a synthesis gas pressure stabilizing valve 203, so that the target operation pressure of the synthesis gas is higher than the natural gas pressure, the natural gas pressure is 34.5-36barg, and the synthesis gas pressure is 37.5 barg.
Theoretically, the closer the pressures of natural gas and syngas, the easier the heating value control; the greater the difference in pressure between natural gas and synthesis gas, the more difficult the control of the heating value. At present, before natural gas and synthetic gas enter a mixed gas static mixer 301 and a mixed gas buffer tank 302, the operating pressures of the two gases are as close as possible, if the synthetic gas pressure is required to be closer to the natural gas pressure in the equipment debugging stage of a mixed gas station, the set value of a synthetic gas pressure stabilizing valve 203 can be properly adjusted down. Meanwhile, the mixed gas pressure stabilizing valve 304 adopts a self-operated mechanical structure, has high pressure regulating precision, good reliability and high stability, has the reaction time of less than or equal to 1 second, further regulates and stabilizes the pressure of the mixed gas, and meets the fluctuation requirement of the gas turbine on the pressure of the mixed gas.
And (IV) controlling the low calorific value of the mixed gas:
during the starting and closing of the combustion engine, 100% of natural gas is required, and the switching between natural gas and mixed gas can be completed within a specified load range. On the premise that the proportioning components of the natural gas and the synthesis gas keep stable operation for a long time, the natural gas flow control valve 106 keeps the flow of the natural gas passing through unchanged, and the synthesis gas flow control valve 206 is slowly adjusted.
1. The data of the control system are input by combining the natural gas online chromatograph 104, the synthetic gas online chromatograph 204, the natural gas flowmeter 105, the mixed gas rapid heating value instrument 303 and the like, the target heating value after mixing is set, and the synthetic gas flow rate required by theory can be calculated;
2. the opening rate of the synthesis gas flow control valve 206 is regulated according to the flow meter signals and the volume percentage of the natural gas flow meter 105 and the synthesis gas flow meter 205, the synthesis gas flow control valve enters a static mixing system, and the mixed gas static mixer 301 enables the two gases to be uniformly mixed and slowly reaches the target heat value of the mixed gas; the opening rate of syngas flow control valve 206 may be calculated from the volume of the gas mixture system and the curve theory of the opening of syngas flow control valve 206 versus the through-flow rate to calculate the minimum time interval within the desired travel range of the control valve. 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 heat value of the mixed gas outlet as a feedback signal to protect and limit the opening and the speed of the synthesis gas flow control valve 206, namely, fine adjustment is carried out according to a theoretical synthesis gas flow value and an actually measured synthesis gas flow value, and further the requirements of the combustion engine on the heat value speed and the mixing proportion are met. The mixed gas rapid heating value meter 303 can detect and correct the control functions of the opening degrees of the natural gas flow control valve 106 and the synthetic gas flow control valve 206, and is implemented in the control system.
4. The reaction speed of the mixed gas rapid heating value instrument 303 directly influences the control of the heating value, the faster the reaction speed, the easier the heating value control is performed in time, the higher the heating value accuracy of the mixed gas is, and the mixed gas rapid heating value instrument 303 needs to have excellent measurement characteristics, such as extremely short response time and extremely high measurement accuracy.
Meanwhile, the mixed gas rapid heating value instrument 303 monitors and alarms the safety range of the mixed gas, and the synthesis gas flow control valve 206 needs to have a rapid 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;
(V) automatic partition of the blending system:
an automatic natural gas emergency shut-off valve 101, a synthesis gas emergency shut-off valve 201 and a mixed gas emergency shut-off valve 305 are arranged for safe and reliable operation of the system and operation mode requirements of the gas turbine.
The setting numerical ranges of the modules in the natural gas filtering and heating metering flow control branch 1, the synthetic gas filtering and metering flow control branch 2 and the mixed gas mixing stable road 3 can be set according to the gas transmission requirements of different gas turbines.
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 invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. The utility model provides a power plant is with gas mixing system, includes that natural gas filters heating measurement flow control branch road (1), control system, its characterized in that: the device also comprises a synthesis gas filtering and metering flow control branch (2) and a mixed gas mixing stable road (3);
the synthesis gas filtering and metering flow control branch (2) comprises a synthesis gas emergency shut-off valve (201), a synthesis gas filter (202), a synthesis gas pressure stabilizing valve (203), a synthesis gas online chromatograph (204), a synthesis gas flowmeter (205) and a synthesis gas flow control valve (206), one end of the synthesis gas emergency shut-off valve (201) is connected with one end of the synthesis gas filter (202) through a gas transmission pipeline, the other end of the synthesis gas filter (202) is connected with one end of the synthesis gas pressure stabilizing valve (203) through a gas transmission pipeline, the other end of the synthesis gas pressure stabilizing valve (203) is connected with one end of the synthesis gas online chromatograph (204) through a gas transmission pipeline, the other end of the synthesis gas online chromatograph (204) is connected with one end of the synthesis gas flowmeter (205) through a gas transmission pipeline, the other end of the synthesis gas flowmeter (205) is connected with one end of the synthesis gas flow control valve (, the other end of the synthesis gas flow control valve (206) is connected to the mixed gas static mixer (301) through a gas pipeline;
the mixed gas blending stable road (3) comprises a mixed gas static mixer (301), a mixed gas buffer tank (302), a mixed gas rapid heating value instrument (303), a mixed gas pressure stabilizing valve (304) and a mixed gas emergency shut-off valve (305), one end of the mixed gas static mixer (301) is connected with the natural gas flow control valve (106) and the synthetic gas flow control valve (206) through gas transmission pipelines respectively, the other end of the mixed gas static mixer (301) is connected with the mixed gas buffer tank (302) through gas transmission pipelines, the other end of the mixed gas buffer tank (302) is connected with the mixed gas rapid heat value instrument (303) through gas transmission pipelines, the other end of the mixed gas rapid heat value instrument (303) is connected with the mixed gas pressure stabilizing valve (304) through gas transmission pipelines, the other end of the mixed gas pressure stabilizing valve (304) is connected with one end of the mixed gas emergency shut-off valve (305) through gas transmission pipelines, and the other end of the mixed gas emergency shut-off valve (305) is connected with the gas turbine;
the natural gas filtering and heating metering flow control branch (1) is connected with the synthesis gas filtering and metering flow control branch (2) in parallel and then is connected with the mixed gas mixing stable road (3) and the control system through a gas pipeline.
2. The fuel gas blending system for a power plant of claim 1, wherein: the gas supply pressure at the natural gas inlet is 36-37barg, the inlet temperature is 0-5 ℃, and the flow rate is 60000Nm3H, syngas inlet feed pressure: 41-60barg, inlet temperature 30-40 deg.C, and flow rate 40000Nm3/h。
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| CN202022004441.2U CN213680558U (en) | 2020-09-14 | 2020-09-14 | Gas mixing system for power station |
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| CN202022004441.2U CN213680558U (en) | 2020-09-14 | 2020-09-14 | Gas mixing system for power station |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112126485A (en) * | 2020-09-14 | 2020-12-25 | 大连派思燃气设备有限公司 | Gas mixing system for power station |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112126485A (en) * | 2020-09-14 | 2020-12-25 | 大连派思燃气设备有限公司 | Gas mixing system for power station |
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