CN104031707A - Method for quality conditioning of industrial combustion natural gas - Google Patents
Method for quality conditioning of industrial combustion natural gas Download PDFInfo
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- CN104031707A CN104031707A CN201310070439.7A CN201310070439A CN104031707A CN 104031707 A CN104031707 A CN 104031707A CN 201310070439 A CN201310070439 A CN 201310070439A CN 104031707 A CN104031707 A CN 104031707A
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Abstract
The invention relates to a method for quality conditioning of industrial natural gas. When the actual wobbe index of natural gas is lower than a set wobbe index, conditioning gas and/or inert gas with a wobbe index higher than the set wobbe index of natural gas can be selected for blending; and when the actual wobbe index of natural gas is higher than a set wobbe index, conditioning gas and/or inert gas with a wobbe index lower than the set wobbe index of natural gas can be selected for blending. By controlling the wobbe index of natural gas and theoretical air requirement, the method can control the heat load capacity of natural gas combustion and the air-fuel ratio, thus being conducive to optimization and conditioning of a natural gas combustion utilization system, and enhancing the utilization efficiency of natural gas. With the characteristics of strong practicability, wide control range, flexibility and controllability, the method can make full use of the existing medium and low calorific value fuel gas, saves natural gas resources, mitigates the quality requirements for actual natural gas supplied to the upstream, also can solve air source quality adjustment during conventional combustible gas industrial application, and at the same time lowers the natural gas conditioning cost.
Description
Technical field:
The present invention relates to a kind of modified method of industrial natural gas makings.By changing combustion of natural gas characteristic (Wobbe index, calorific value), reach the requirement of setting Sweet natural gas.
Background technology:
Current China's natural gas is in the high-speed developing period, estimates 2015, and Natural Gas Consumption Using will reach 2400 billion cubic meters, is about 3 times of tolerance in 2010.Along with the increase of natural gas supply, industrial combustion increases considerably by amount of natural gas, especially adopts the Sweet natural gas-steam combined cycle power generating of cascaded utilization of energy and the construction of heating plant to start to increase.The source of the gas of China's natural gas is more, it is larger that makings differs, and Sweet natural gas-steam combined cycle power generating, industrial burning device are higher to the requirements for gas quality of Sweet natural gas, in order to ensure the safety of operation and to improve the efficiency of energy utilization, need to regulate in real time Wobbe index and the calorific value of Sweet natural gas.The reserves of China's natural gas are limited, need to save to use; Simultaneously China various places also have many in, low-calorie combustion gas resource, as reformed gas, coke-oven gas, water-gas, producer gas, mine gas, blast furnace gas all can provide utilization.In addition, current coal-seam gas, the large-scale development of shale gas and long distance are carried and are networked, and also will be faced with the adjustment of source of the gas makings and supply stable technical problem.
Wobbe index, for characterizing fuel gas buring load, depends on the parameter of exchangeability.For a gas appliance, before and after the density of nozzle number, nozzle diameter, air and nozzle, pressure reduction remains unchanged, if need to change combustion gas time, as long as the Wobbe index of combustion gas is constant, the thermal load of gas utensil just can remain unchanged.When displacement gas and reference gas become phase-splitting difference not too large time, can meet the demands by Wobbe index value.Calorific value is the foundation of calculating theoretical combustion air amount.Fuel gases calorific value is defined as: 1m
3the heat that combustion gas perfect combustion discharges is called the calorific value of combustion gas, and unit is kJ/m
3or MJ/m
3; For liquefied petroleum gas (LPG), calorific value unit can be with kJ/kg or MJ/kg.Calorific value can be divided into high heating value or low heat value.High heating value refers to 1m
3after combustion gas perfect combustion, its flue gas is cooled to original temperature, and water vapour is wherein discharged time institute's liberated heat with condensed water state.Low heat value refers to 1m
3after combustion gas perfect combustion, its flue gas is cooled to original temperature, but water vapour in flue gas is still steam condition time institute liberated heat.The difference of high and low calorific value numerical value is the gasification latent heat of water vapour.The calorific value of mixed combustible gas body can be recorded or be calculated according to mixing rule by the calorific value of pure gas by calorimeter.Theoretical air requirement refers to according to reaction metering equation perfect combustion 1m
3the needed air capacity of combustion gas is also perfect combustion 1m
3the needed minimum air capacity of combustion gas, unit is m
3/ m
3.
After the Wobbe index of the mixed gass such as Sweet natural gas, oily gas, indifferent gas is determined, the calorific value of air mixture can be drawn by its relative density, and then obtains theoretical air requirement.
CN200480037786.9 has described a kind of control method of natural gas liquids, key step is: first natural gas liquids is separated into the natural gas flow of methane rich and the hydrocarbon of Fu Duo carbon atom, then the natural gas flow of methane rich is carried out to a part of liquid compressed natural gas stream of the cooling generation of heat exchange with partial liquefaction natural gas flow again, the hydrocarbon of the many carbon atoms of richness is transported to distiller to produce the fluid of natural gas liquids stream and methane-rich gas; Liquid stream obtained above is separated, to reach the liquid ingredient that regulates natural gas quality and reclaim Sweet natural gas.
CN200680005061.0 has described a kind of operation of condition lng, and key step is as follows: from 15 to 35barg pressure range, the raw material of natural gas liquids is flow to heat exchanger to produce the natural gas flow of at least a portion vaporization; The distiller that above-mentioned at least a portion fluid is sent to the operation that do not reflux flows and is rich in the stream of methane with generation natural gas liquids; Then the fluid that is rich in methane is sent to heat exchanger, cooling by carrying out heat exchange with the feedstream of partial liquefaction Sweet natural gas, to produce liquefied natural gas stream; Liquefied natural gas stream is vaporized to produce the Sweet natural gas of adjusting and reclaimed natural gas liquid (NGL).
Through retrieval, above-mentioned two patents all belong to the Sweet natural gas hardening and tempering method of non-blending, just by physical method, the heavy hydrocarbon component in natural gas liquids are separated, and carry out makings adjusting according to the concrete amount separating.The present invention carries out blending adjusting with other the modified gas beyond Sweet natural gas and indifferent gas to have any different.
Summary of the invention:
The object of this invention is to provide the modified method of a kind of industrial combustion natural gas quality, when the combustioncharacteristics index of actual Sweet natural gas has difference with the index of setting Sweet natural gas, and the makings that has exceeded industrial natural gas firing allows when variation range, adopt the method for blending combustion gas and indifferent gas, change combustion of natural gas characteristic (Wobbe index, calorific value), reach the requirement of setting Sweet natural gas.
Concrete scheme of the present invention is: when the Wobbe index of actual Sweet natural gas is when setting the Wobbe index of Sweet natural gas, and the method that adopts " combustion gas+indifferent gas+actual Sweet natural gas of high heating value " to carry out blending; When the Wobbe index of actual Sweet natural gas is during higher than the setting Wobbe index of Sweet natural gas, the method that adopts " in, low-calorie combustion gas+indifferent gas+actual Sweet natural gas " to carry out blending.
The method adopts mixes Sweet natural gas in varing proportions from different calorific value fuel gas and flue gas composition, makes it to reach the requirement of the setting combustioncharacteristics index (thermal load and theoretical air requirement) of Sweet natural gas.
Feature of the present invention is:
(1) can control thermal load ability and the air-fuel ratio of combustion of natural gas by controlling the Wobbe index of Sweet natural gas and theoretical air requirement;
(2) be conducive to combustion of natural gas and utilize the optimization of system modified, improve the utilising efficiency of Sweet natural gas;
(3) practical, span of control is wide, has handiness and controllability;
(4) can make full use of existing in, fuel gas with low heat value, save the resource of Sweet natural gas.
Brief description of the drawings
Fig. 1 example process
1-air compressor; 2-combustion chamber; 3-gas turbine; 4-steam boiler; 5-steam turbine; 6-generator; 7-for heat-heat exchanger; 8-feedwater heating apparatus
Embodiment:
Blending target is to set Sweet natural gas, blending main body is actual Sweet natural gas, blending is drawn together liquefied petroleum gas (LPG), natural gas liquids, dme, pipe natural gas, Sweet natural gas reformed gas, coke-oven gas, water-gas, mine gas, producer gas, blast furnace gas etc. with modified gas bag, for meeting the requirement of thermal load, and blending indifferent gas (flue gas, nitrogen etc.).In the time that the Wobbe index of actual Sweet natural gas is lower than the Wobbe index of setting Sweet natural gas, with the combustion gas (liquefied petroleum gas (LPG), liquefied dimethyl ether gas, natural gas liquids etc.) of high heating value, combustion gas is as modified source of the gas, and blending indifferent gas.In the time that the Wobbe index of actual Sweet natural gas is higher than the Wobbe index of setting Sweet natural gas, according to the condition of source of the gas, low-calorie combustion gas in can selecting (pipe natural gas, Sweet natural gas reformed gas, coke-oven gas, water-gas, mine gas, producer gas, blast furnace gas etc.) is as modified source of the gas, and blending flue gas, also use indifferent gas (flue gas and nitrogen etc.) directly to carry out blending.
Makings example of parameters is in table 1.
Table 1 makings example
Implementation step is as follows:
(1), according to the characteristic of existing natural air-air source, determine the setting parameters of natural gas of combustion unit;
(2) select modified source of the gas.When the Wobbe index of actual Sweet natural gas lower than set Wobbe index time, select Wobbe index to carry out blending higher than the modified gas of setting Sweet natural gas Wobbe index; When the Wobbe index of actual Sweet natural gas higher than set Wobbe index time, select Wobbe index to carry out blending lower than the modified gas of setting Sweet natural gas Wobbe index.
(3) determine the composition of mixed gas.While actual Sweet natural gas being carried out to blending with modified gas and indifferent gas, in order to control Wobbe index and the calorific value of Sweet natural gas, according to adding and the normalization method law of principle and combustion gas composition of the definition of combustion gas Wobbe index, fuel gases calorific value, can obtain following equation:
In formula: x, y, the volume integral subfraction of z---modified gas, indifferent gas and actual Sweet natural gas;
H
1, H
2, H
3---the calorific value of modified gas, indifferent gas and actual Sweet natural gas;
D
1, d
2, d
3---the relative density of modified gas, indifferent gas and actual Sweet natural gas;
W
0---calorific value and Wobbe index that after blending, combustion gas will reach.
H
0---calorific value and Wobbe index that after blending, combustion gas will reach.
Solving equations (1), can draw to meet and set modified gas, the indifferent gas of heating value of natural gas and Wobbe index, the volume integral subfraction of actual Sweet natural gas.The composition of blending scheme and mixed gas is in table 2.
Table 2 is set gas phase different modified schemes and simulation blending composition example simultaneously
(4) ratio of the variable valve control blending by modified gas and indifferent gas.
(5) modified mixed gas is sent into industrial burning device burning heat energy is provided.
(6) be described taking Sweet natural gas-steam combined cycle power generating as example.Supply Sweet natural gas carries out modified Sweet natural gas-steam combined cycle power generating flow process and sees Fig. 1.
Sweet natural gas after blending enters combustion chamber 2 and burns together with the air pressurizeing through air compressor 1, produces the high temperature and high pressure flue gas of 1600～1800 DEG C and enters gas turbine 3 acting of expanding, and drives generator 6 to generate electricity.The flue gas that cools to 700～800 DEG C through adiabatic expansion enters steam boiler 4, produces the steam of 4～6MPa, enters steam turbine 5 acting of expanding, and drive generator 6 generates electricity.The low-pressure steam expanding after acting, through being condensed into water with interchanger 7 heat exchange, after feedwater heating apparatus 8 heats up, enters steam boiler 4, for producing steam.The flue gas that steam boiler 4 is discharged can separate a part as required as indifferent gas, and the makings that participates in the lump Sweet natural gas with modified gas regulates.
Sweet natural gas-steam combined cycle power generating process is higher for the requirements for gas quality of Sweet natural gas, and the thermal load parameter Wobbe index of Sweet natural gas generally can not exceed 5% of design load, otherwise in combustion chamber, there will be combustion pulsation, damage equipment.Therefore, exceed standard once the Wobbe index of Sweet natural gas, carry out modified.Its modified tolerance is as the criterion with the volume integral subfraction that meets the modified gas, flue gas and the actual Sweet natural gas that calculate by formula (1).Then, the ratio of the variable valve control blending by actual Sweet natural gas, modified gas and flue gas, realizes stable, safe combustion.
Claims (3)
1. the modified method of natural gas quality for industrial combustion, is characterized in that:
(1), according to the characteristic of existing natural air-air source, determine the setting parameters of natural gas of combustion unit;
(2) select modified source of the gas, when the Wobbe index of actual Sweet natural gas lower than set Wobbe index time, select Wobbe index to carry out blending higher than modified gas and/or the indifferent gas of setting Sweet natural gas Wobbe index; When the Wobbe index of actual Sweet natural gas higher than set Wobbe index time, select Wobbe index to carry out blending lower than modified gas and/or the indifferent gas of setting Sweet natural gas Wobbe index;
(3) determine forming of mixed gas by following equation:
In formula: x, y, the volume integral subfraction of z---modified gas, indifferent gas and actual Sweet natural gas;
H
1, H
2, H
3---the calorific value of modified gas, indifferent gas and actual Sweet natural gas;
D
1, d
2, d
3---the relative density of modified gas, indifferent gas and actual Sweet natural gas;
W
0---calorific value and Wobbe index that after blending, combustion gas will reach;
H
0---calorific value and Wobbe index that after blending, combustion gas will reach;
Solving equations (1), draws to meet and sets modified gas, the indifferent gas of heating value of natural gas and Wobbe index, the volume integral subfraction of actual Sweet natural gas.
2. a kind of industrial combustion modified method of natural gas quality according to claim 1, is characterized in that:
Described modified gas is liquefied petroleum gas (LPG), natural gas liquids, dme, pipe natural gas, Sweet natural gas reformed gas, coke-oven gas, water-gas, mine gas, producer gas or blast furnace gas.
3. a kind of industrial combustion modified method of natural gas quality according to claim 1, is characterized in that: described indifferent gas is flue gas, nitrogen.
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|---|---|---|---|
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| CN107084054A (en) * | 2017-04-24 | 2017-08-22 | 华电电力科学研究院 | A kind of combustion gas characteristic control system and regulation and control method |
| CN109425668A (en) * | 2017-08-31 | 2019-03-05 | 宁波方太厨具有限公司 | A kind of artificial coal gas component modification method |
| CN110205172A (en) * | 2019-03-19 | 2019-09-06 | 武威福民汇科技开发有限公司 | A kind of mixed clean fuel of gas |
| CN110573799A (en) * | 2017-03-07 | 2019-12-13 | 八河流资产有限责任公司 | System and method for operating a flexible fuel combustor of a gas turbine |
| CN111607442A (en) * | 2020-05-15 | 2020-09-01 | 重庆燃气集团股份有限公司 | Comprehensive energy utilization system for natural gas storage and peak regulation and storage and peak regulation method |
| CN112255363A (en) * | 2020-10-10 | 2021-01-22 | 华润（南京）市政设计有限公司 | Natural gas hydrogen-doped gas qualification judgment method for gas terminal user system |
| CN113188151A (en) * | 2020-01-14 | 2021-07-30 | 中国石油天然气股份有限公司 | Combustion-supporting method for combustor |
| CN113294266A (en) * | 2020-02-21 | 2021-08-24 | 中国石油天然气股份有限公司 | Air-fuel ratio regulating and controlling device and method for compressor |
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| CN113188151A (en) * | 2020-01-14 | 2021-07-30 | 中国石油天然气股份有限公司 | Combustion-supporting method for combustor |
| CN113294266A (en) * | 2020-02-21 | 2021-08-24 | 中国石油天然气股份有限公司 | Air-fuel ratio regulating and controlling device and method for compressor |
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| CN111607442A (en) * | 2020-05-15 | 2020-09-01 | 重庆燃气集团股份有限公司 | Comprehensive energy utilization system for natural gas storage and peak regulation and storage and peak regulation method |
| CN112255363A (en) * | 2020-10-10 | 2021-01-22 | 华润（南京）市政设计有限公司 | Natural gas hydrogen-doped gas qualification judgment method for gas terminal user system |
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Application publication date: 20140910 |