CN103711587B - A kind of high pressure reheating combined cycle generation system of fuel gas-steam and electricity-generating method - Google Patents
A kind of high pressure reheating combined cycle generation system of fuel gas-steam and electricity-generating method Download PDFInfo
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- CN103711587B CN103711587B CN201310722096.8A CN201310722096A CN103711587B CN 103711587 B CN103711587 B CN 103711587B CN 201310722096 A CN201310722096 A CN 201310722096A CN 103711587 B CN103711587 B CN 103711587B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K5/00—Plants characterised by use of means for storing steam in an alkali to increase steam pressure, e.g. of Honigmann or Koenemann type
- F01K5/02—Plants characterised by use of means for storing steam in an alkali to increase steam pressure, e.g. of Honigmann or Koenemann type used in regenerative installation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
Abstract
The present invention relates to a kind of high pressure reheating combined cycle generation system of fuel gas-steam and electricity-generating method.This system is made up of gas turbine subtense angle and steam turbine subtense angle, and gas turbine subtense angle comprises the device for two-stage air compressing, twice combustion and high pressure, the twice turbine acting of middle pressure; After high-temperature fuel gas does work for the first time, enter twice work doing after the reheating of middle pressure burner room, improve the average endothermic temperature of overall circulation; Arrange at least one grade of inter cooler in the middle of two stage compressor, inter cooler hot-fluid is connected with two stage compressor.Steam turbine subtense angle adopts boiler and the steam turbine of three-pressure reheat formula, and inter cooler cooling water is connected with high pressure water, high, normal, basic setting-out and inter cooler cooling water multiple fractionation absorb heat, efficiency utilization heat energy.When the present invention runs under optimal parameter, combined cycle efficiency is that main combined cycle system improves 3 to 5 percentage points compared with F level gas turbine, and unit output power improves more than 70%, reaches 800MW level.
Description
Technical field
The present invention relates to a kind of integrated gas-steam combined cycle power plant device, particularly a kind of high pressure reheating combined cycle generation system of fuel gas-steam.The invention still further relates to the electricity-generating method that can use this power generation system.
Background technique
The most frequently used vapor recycle mode of traditional thermal power generation is Rankine cycle (RankineCycle), but it is low to there is generating efficiency based on the generation technology of Rankine cycle, the problems such as coal-fired consumption is large, seriously polluted.Traditional vapor recycle generation mode cannot meet social economy's sustainable development needs, as fossil energy, the increasingly serious of non-renewable and environmental problem of coal and petroleum resources makes researcher increasing sight be invested on energy-conservation, clean generation technology.Gas turbine is a kind of employing brayton cycle (BraytonCycle), with the thermodynamic apparatus that air and combustion gas are working medium, gas turbine and combined cycle thereof have pollutes the features such as low, power supply efficiency is high and load range is wide, rock gas can directly be applied on gas turbine installation, and does not need independent working medium generation equipment.World natural gas resource is sufficient, cheap, and under the demand driving of national economic development strategy and international competition, many countries are all using the emphasis that the gas turbine technology of advanced person is developed as the scientific and technological Priority setting of this country and key technology research.
Some famous in the world gas turbine MANUFACTURER have succeeded in developing a series of advanced in performance unit.As GE company 9FA, the GT26 etc. of ABB AB.These unit single-machine capacitys are at more than 200MW, and combustion gas initial temperature reaches more than 1260-1300 DEG C, pressure ratio 10-30, and simple cycle efficiency is about 40%.In order to improve the efficiency of power generating equipment further, use a kind of new generation technology---Gas-steam Combined Cycle (GTCC:GasTurbineCombinedCycle), steam turbine Rankine cycle is circulated with the brayton cycle of gas turbine and combines, make use of the advantage that the average endothermic temperature of gas turbine cycle is high and the average exothermic temperature of steam turbine is low simultaneously, overcome again both shortcomings, so cycle efficiency is much higher than independent gas turbine or steam turbine generator set.At present, gas turbine composition combined cycle behind efficiency is more than 55%, and the combined cycle system efficiency as 9FA composition can reach 56.7%, and the KA26 combined cycle system efficiency of GT26 composition is more than 58%.
Be on the basis of the Gas-steam Combined Cycle of representative at F level gas turbine, the space that combined cycle efficiency promotes in addition by a relatively large margin.And for GT26 system, which employs sequential combustion device (SequentialCombustionSystems), make use of reheat vapor cycle, achieve higher pressure ratio, by one group of 22 grades of efficient subsonic compressor, air is pressed into annular environmental protection firing chamber with the high pressure doubling conventional combustion engine pressure ratio, high to the technological requirement of combustion engine equipment, involve great expense.
Summary of the invention
The present invention has developed the electricity-generating method of existing Gas-steam Combined Cycle, improve for the existing association circulating power generation system being representative with 9FA level combustion engine combined cycle system, high pressure reheating and cooling during rolling process is added in combustion gas circulation, and improve in vapor recycle mode for a utilization for cold and hot amount, this power generation system combined cycle efficiency is made to improve 3 to 5 percentage points than based on the combined cycle of F level gas turbine, unit output power improves more than 70%, reaches 800MW level; Invention also provides improved high pressure reheating integrated gas-steam combined cycle power plant method.
For realizing above goal of the invention, the present invention transforms existing 9FA combustion engine combined cycle, adds high pressure reheating and cooling during rolling two processes in the original simple brayton cycle of gas turbine, forms the gas turbine engine systems carrying out complicated brayton cycle; Vapor recycle part boiler circuit is improved, inter cooler cooled water heat energy is recycled in vapor recycle; Fig. 2 is shown in thermodynamic cycle of the present invention and the contrast of existing 9FA and GT26 combined cycle system, and compare existing system, the present invention's increase more obvious than merit, overall cycle efficiency also can obtain certain lifting.
Technological scheme of the present invention is specially:
(1) the inventive method is, step comprises:
Combustion gas circulates.Based on brayton cycle, pass into pressurized air and fuel mix is burnt, the high-temperature fuel gas turbine acting pushing generator generating of generation, exhaust imports vapor recycle recovery waste heat; Described air is excess air, and compression process is two-stage, is depressed into first class pressure, is depressed into secondary pressure with two-stage compressor with one-level gas compressor, the maximum pressure after this pressure and air compressing; Through the cold process of at least one inter-stage between air two stage compression; Add thermal process again in described combustion gas circulation, once combustion gas twice turbine acting in circulation, by the combustion gas reheating reduced by pressure after high-pressure gas turbine, then by middle pressure combustion gas turbine.
Vapor recycle.Based on Rankine cycle, using combustion gas circulating exhaust waste heat as thermal source, generated electricity by steam acting pushing generator.
Based on a kind of power generation system of this electricity-generating method, be made up of gas turbine subtense angle and steam turbine subtense angle, gas turbine subtense angle comprises medium voltage network and high-pressure system, medium voltage network comprises one-level gas compressor, middle pressure burner room and middle pressure combustion gas turbine, high-pressure system comprises two-stage compressor, high compression combustion chamber and high-pressure gas turbine, is provided with at least one grade of inter cooler between firsts and seconds gas compressor; Air enters high compression combustion chamber combustion heating, enters middle pressure burner room after high-temperature fuel gas high pressure turbine after sequentially passing through described I and II gas compressor two stage compression, intermediate pressure turbine acting after reheating; Medium voltage network relief opening is communicated with steam turbine subtense angle, is vented and reclaims heat at steam turbine subtense angle.
(2) power generation system Gen Ju (1) and method, arranging air first class pressure during operational system is 1.5-2.4MPa, and secondary pressure is 6-20MPa; Arrange the cold process of an inter-stage, a cold temperature is 100-200 DEG C.
(3) power generation system Gen Ju (2) and method, during operational system, parameter is set to further, and described high-pressure gas turbine intake temperature is 1000-1500 DEG C, and middle pressure combustion gas turbine intake temperature is 1200-1500 DEG C.
(4) power generation system Gen Ju any one of (1) to (3) and method, for improving combined cycle efficiency further, the cooling water of cold process between described is introduced in described vapor recycle, the heat exchanged when recycling water quench pressurized air in vapor recycle.In corresponding power generation system, the cooling water of inter cooler is communicated with steam turbine subtense angle.
(5) power generation system Gen Ju any one of (1) to (4) and method, the steam turbine subtense angle carrying out vapor recycle in power generation process uses waste heat boiler type, comprises exhaust heat boiler and steam turbine; Exhaust heat boiler is used for reclaiming, changing and utilize the exhaust heat of gas turbine, normally the composition such as heat exchange tube bundle and container such as drum, economizer, vaporizer, superheater and header.
(6) power generation system Gen Ju any one of (1) to (5) and method, use three-pressure reheat formula exhaust heat boiler and steam turbine in power generation process further; Three pressure type water supply structures are divided into high, medium and low setting-out three tunnel, classification heat absorption of feeding water in exhaust heat boiler, have passed through the overheated three phases of the heating of water, saturation water evaporation and saturated vapour; Steam turbine is provided with high, medium and low voltage three cylinders, is connected the reheater in exhaust heat boiler between high-pressure cylinder relief opening with intermediate pressure cylinder suction port, and high-pressure cylinder steam discharge, after reheater reheating, enters intermediate pressure cylinder acting.
(7) power generation system Gen Ju (6) and method, by the high pressure water circuit of the cooling water access three-pressure reheat formula vapor recycle in a cold process.In corresponding power generation system, inter cooler cooling water flow can be selected to be communicated with the high pressure gas bag in exhaust heat boiler, the high-pressure feed water that cooling water becomes components vaporize after inter cooler heat absorption enters HP steam drum, directly mix from the high-pressure feed water of steam turbine subtense angle with another part and vaporize, enter high pressure carbonated drink flow process.Due to adding of a cold water, the high-pressure feed water amount in three pressure feedwater improves a lot, and high-pressure feed water proportion more general three-pressure reheat water supply system is high.
(8) according to the power generation system Gen Ju any one of (6) to (7) and method, in described vapour-cycling, high, medium and low three road pressure are set to 9.63MPa, 2.16MPa and 0.367MPa respectively.
(9) power generation system Gen Ju (8) and method, arrange first class pressure 1.54MPa, secondary pressure 14MPa, a cold temperature 100 DEG C, and high-pressure gas turbine intake temperature and middle pressure combustion gas turbine intake temperature are 1325 DEG C.Now, the combined cycle efficiency of described power generation system is the highest.
(10) power generation system Gen Ju any one of (1) to (9) and method, by belong in medium voltage network press combustion gas turbine and one-level gas compressor coaxially arranged, the high-pressure gas turbine and the two-stage compressor that belong to high-pressure system are coaxially arranged, and combustion gas turbine and generator adopt clutch or other usual way connecting shaft.High-pressure system and medium voltage network can all coaxially be arranged, and make high pressure, middle pressure combustion gas turbine and two stage compressor all coaxial; Also can arrange by split axle, one-level gas compressor and two machine gas compressors are distributed in disalignment, separately respectively with middle pressure combustion gas turbine and high-pressure gas turbine coaxial, form independently high-pressure system and medium voltage network, when split axle is arranged, can select flexibly whether to start high-pressure system by load during system cloud gray model, gas compressor can be avoided to be put into the situation that the same axis causes gas turbine to drag simultaneously, reduce and start difficulty.
For the concrete selection of described vapor recycle subtense angle, general, when delivery temperature is lower than 538 DEG C under nominal power for gas turbine, then single pressure or the multiple pressure of adopting without the boiler circuit of reheating more; When combustion turbine exhaustion temperature is higher than 538 DEG C, then can adopt the boiler circuit of reheat vapor cycle; When combustion turbine exhaustion temperature is higher than 593 DEG C, then can adopt the boiler circuit that three-pressure reheat circulates.The present invention uses 9FA level gas turbine as benchmark, and delivery temperature is 650 DEG C, has therefore selected three-pressure reheat formula steam circulation.
For the Operational Limits in power generation system of the present invention and method, the present invention is directed to high pressure reheating Gas-steam Combined Cycle and carry out parameter optimization, find the parameter of the optimization run based on present system, reach best combined cycle efficiency.
The present invention uses aspenplus software to carry out modeling to current 9FA level Combined cycle gas-steam turbine unit, GT26 unit and power generation system of the present invention, carries out parameter optimization by computational analysis to power generation system of the present invention, determines best operating mode.
Before present system analog computation, first modeling is carried out to existing 9FA level Combined cycle gas-steam turbine unit, GT26 unit.
ISO operating mode is adopted, ambient temperature 15 DEG C, atmospheric pressure 0.10135MPa, relative humidity of atomsphere 60% during system simulation.With reference to the Operational Limits that 9FA system is announced, determine that inlet air parameter is 0.1MPa/15 DEG C/678.5kg/s, after compressor compresses, combustion gas parameter is 1.54MPa/404.5 DEG C/678.5kg/s, and entrance combustion gas parameter is 1.54MPa/15 DEG C/16.8kg/s; It is 1.54MPa/1325 DEG C/695.3kg/s that burning generates high-temperature fuel gas parameter, and the tail gas parameter after combustion gas turbine is 0.105MPa/650 DEG C/695.3kg.Combustion engine acting is 314MW.Vapor portion is three-pressure reheat formula, and pressure rank is 9.63MPa, 2.16MPa, 0.367MPa respectively.High-pressure cylinder steam inlet condition is 9.63MPa/540 DEG C/90.8kg/s; High-pressure cylinder steam discharge parameter 2.16MPa/321 DEG C/90.8kg/s; Intermediate pressure cylinder steam inlet condition 2.16MPa/540 DEG C/104.2kg/s; Low pressure (LP) cylinder steam inlet condition 0.367MPa/300.3 DEG C/121.5kg/s; Steam discharge parameter 0.00484MPa/35.5 DEG C/121.5kg/s.The total output work of steam turbine is 160.7MW.
Analog result is gathered and contrasts with existing 9FA level association system parameter, as shown in table 1.
Table 1: existing 9FA system and aspen analog parameter contrast
| Project | Existing 9FA type combined cycle system | Aspen simulates baseline system |
| Air mass flow | 638.5kg/s | 678.5kg/s |
| Gas discharge | 16.8kg/s | 16.8kg/s |
| Pressure ratio | 15.4 | 15.4 |
| Combustion gas turbine intake temperature | 1325℃ | 1325℃ |
| Delivery temperature | 609℃ | 658℃ |
| Temperature of exhaust fume | 83℃ | 82℃ |
| Combustion engine is exerted oneself | 304MW | 307MW |
| Total output work | 472MW | 468MW |
| Combustion engine efficiency | 37.23% | 37.56% |
| Combined cycle efficiency | 57.74% | 57.20% |
As shown in Table 1, aspen analog system efficiency and actual 9FA system effectiveness are more or less the same, parameters relatively, simulation comparatively meet existing 9FA system, therefore the present invention select aspen to simulate 9FA system as baseline system.
For GT26 system, basis of reference system carries out optimum configurations, and analog result and existing GT26 system contrast as shown in table 2.
Table 2: existing GT26 system and aspen analog parameter contrast
| Project | Existing GT26 system | Aspen analog system |
| Air mass flow | 545.6kg/s | 540kg/s |
| Gas discharge | 16.4kg/s | 12.99kg/s |
| Pressure ratio | 30 | 30 |
| Combustion gas turbine intake temperature | 1255℃ | 1235℃ |
| Reheat temperature | 1255℃ | 1235℃ |
| Delivery temperature | 630℃ | 605℃ |
| Combustion engine is exerted oneself | 262MW | 267MW |
| Total output work | 398MW | 380MW |
| KA-26 combined cycle efficiency | 57.0% | 60.03% |
For analog result, it should be noted that, the running parameter that GT26 announces sets different from benchmark of the present invention, and after adopting capacity, flow and the general configuration identical with present system, GT26 efficiency in aspen simulation there has also been rising, reaches 60.03%.
Generally, investigate aspen simulation and real system result, can think that Percent of contact area reaches Parameter analysis requirement.
In analog computation process, the integrated combination cycle efficiency of three parameters to present system is had to have significant impact: first class pressure, secondary pressure and a cold rear air temperature.Carry out parameter optimization by variable element experiment, thus find out and make most effective optimum value.Table 3 is depicted as most effective relevant parameter.
Table 3: most effective relevant parameter table
From data in table 3, at air first class pressure 1.5-2.4MPa, secondary pressure is 6-20MPa, and when a cold temperature is 100-200 DEG C, running present system all has preferably combined cycle efficiency.
Preferably, when first class pressure is 1.5-2MPa, secondary pressure is 9-18MPa, between cold temperature 100 DEG C, present system is when this parameter section operation, and combined cycle efficiency, higher than 60.36%, is better than 60.03% efficiency value of the GT26 system using baseline system parameter of the present invention;
Preferred further, when first class pressure is 1.54MPa, when secondary pressure is 14MPa, present system combustion engine efficiency can reach 42.96%, and combined cycle efficiency reaches the highest 61.22%.
After optimal parameter is analyzed, carry out Variable Condition Analysis.There is high and medium voltage two-stage system in present system, thus adjusts high, middle pressure combustion gas turbine intake temperature respectively, can obtain the efficiency of system under different operating mode.By gathering data, converged into table 4.
Table 4: the efficiency at different high pressure temperature
From data in table 4, high-pressure gas turbine intake temperature is 1000-1500 DEG C, and when middle pressure combustion gas turbine intake temperature is 1200-1500 DEG C, present system has preferably combined cycle efficiency.
Preferably, when selection high and medium voltage combustion gas turbine intake temperature is identical, the intake temperature of replying first turbine is made it by the burning of combustion gas reheating, and when control temperature is 1325 DEG C, relatively the highest cycle efficiency can be obtained, now total output work 817MW of combined cycle system, combustion engine efficiency 42.96%, combined cycle efficiency reaches 61.22%.It should be noted that, although shown in table 4, high pressure temperature is increased to 1500 DEG C and can obtains higher efficiency, but this temperature is beyond the F level combustion engine scope of benchmark of the present invention, and raising temperature has more harsh requirement to system process, bring extra cost, therefore improve temperature with obtain more high efficiency be not native system invented party to, therefore do not select 1500 DEG C of data to be optimum condition parameter.
In addition, based on the selectable gas turbine high-pressure system of the present invention and medium voltage network split axle set-up mode, one-level gas compressor is coaxial with intermediate pressure turbine, and medium voltage network forms common F level combustion engine unit, and high-pressure system can be considered the extra high-pressure section increased.Can isolated operation medium voltage network during low-load, now, present system is similar to common 9FA level Combined Cycle Unit.
In sum, present system has following main feature:
1. high pressure reheating.Present invention uses heat structure again, different from common reheating embrittlement, air high-pressure during present system optimum operation up to 14MPa, far above common F level combustion engine (1.5-2MPa) and reheating embrittlement (about 3MPa).The present invention arranges one-level gas compressor compressed air pressure to common combustion engine pressure rank, and two-stage compressor pressurized air is to the high pressure rank of application claims;
2. inter cooler heat recovery.Owing to present invention employs the high pressure of 14MPa, greatly increase the heat loss in air compressing process.Thus native system is provided with inter cooler, reduces two-stage compressor inlet air temperature, reduces compressor wasted work.In addition, in order to utilize this part heat, native system is provided with inter cooler heat recovery section, the cooling water of inter cooler is introduced exhaust heat boiler and is used, make cycle efficiency higher;
3. split axle is arranged.The present invention can select high-pressure system and medium voltage network split axle to arrange.Be separated by high-pressure system and medium voltage network structure, make Starting mode more flexible, can select to start high-pressure system according to load; Two gas compressors are distributed in disalignment simultaneously, can avoid putting the situation that when being distributed on same axle, gas turbine cannot drag, and reduce gas burning system and start difficulty.
The present invention is compared with common F level Combined Cycle Unit.Invention increases reheating and a SAPMAC method device, during operation, the maximum pressure of air compressing is far above common F level unit, and when optimum efficiency is run, efficiency exceeds more than 3 percentage points than common F level unit, and single-machine capacity exceeds 73%, reaches 817MW.
The present invention is compared with GT26 unit.GT26 uses subsonic compressor by air first compression to conventional combustion engine pressure ratio (3MPa) of twice, very high to apparatus and process requirement, involves great expense; The present invention adopt band intercooled two stage compression, by air compressing 14MPa, realize more high pressure ratio, structure is but easy to realize and cost is lower.Air is pressed into annular environmental protection firing chamber with the high pressure doubling conventional combustion engine pressure ratio by one group of 22 grades of efficient subsonic compressor by GT26, without cooling during rolling, involves great expense.Meanwhile, the design of environmental protection firing chamber can reduce the discharge amount of NOx.The present invention adds reheat vapor cycle and cooling during rolling circulation in the simple combustion gas round-robin basis of existing 9FA gas turbine, and what system adopted is multiaxis many combustion engine unit composition " machine group ", technically more easily realize, and cost is lower.Compared with the efficiency 60.03% when running under GT26 reference base condition of the present invention, present system efficiency is high 1.2 percentage points, and compared with the GT26 system of actual motion, it is more that efficiency improves.
When the present invention owing to running near optimal parameter, improve combined cycle efficiency, when sending same charge, gas consumption more common F level gas Combined Cycle Unit has certain minimizing, thus the more common unit of cost of electricity-generating also has certain reduction, table 5 is contrasted novel high-pressure re-heating subsystem and common F level combustion engine system by correlation computations, and in table, partial data adopts approximative value.
Table 5: economic analysis of the present invention
| Unit | F level combustion engine system | High pressure re-heating subsystem | |
| The total output work of system | MW | 471.5 | 825.127 |
| Combustion engine efficiency | % | 38.36 | 42.96 |
| Combined cycle efficiency | % | 57.62 | 61.40 |
| Rate of standard coal consumption b=123/h | g/kWh | 213.468 | 200.326 |
| Installation equipment annual utilization hours | h | 4500 | 5000 |
| Annual electricity generating capacity | Hundred million kWh | 21.2 | 41.3 |
| Spring Festival holidays province-norm coal quantity (compared with F level combustion engine Combined Cycle Unit) | Ton mark coal | 0 | 54218.3 |
| Standard gas consumption rate | Nm3/kWh | 0.36 | 0.33 |
| Year saves natural gas quantity (compared with F level combustion engine Combined Cycle Unit) | Billion cubic meter | 0 | 7.08 |
| Rock gas cost saving | Wan Yuan | 0 | 20.1 |
| Reduce discharging CO2(and F level combustion engine Combined Cycle Unit year to compare) | Ten thousand tons | 0 | 4.68 |
As shown in table 5, use present system to replace common combustion engine on a large scale, effectively can reduce fuel consumption, thus reduce the discharge of greenhouse gases.
Accompanying drawing explanation
Fig. 1 is the power generation system structure schematic diagram of high pressure of the present invention, medium voltage network split axle;
Fig. 2 is the coaxial power generation system structure schematic diagram of high pressure of the present invention, medium voltage network;
Fig. 3 is the circulation warm entropy comparison diagram of GT26,9FA system and heat generating system more of the present invention;
Number in the figure: 11-one-level gas compressor; 12-middle pressure burner room; Combustion gas turbine is pressed in 13-; 21-two-stage compressor; 22-high compression combustion chamber; 23-high-pressure gas turbine; 10,20-generator; 30-inter cooler; Water supply pump between 31-; 40-steam turbine generator; 41-low-pressure pump; 42-low-pressure coal saver; 43-low-pressure drum; 44-low-pressure superheater; 49-steam turbine low pressure (LP) cylinder; Water pump in 51-; Economizer is pressed in 52-; Drum is pressed in 53-; Superheater is pressed in 54-; 55-reheater; 59-steam turbine intermediate pressure cylinder; 61-high-pressure water pump; High-pressure economizer before 62-; High-pressure economizer after 63-; 64-HP steam drum; 65-high-pressure superheater; 69-steam turbine high-pressure cylinder; 71-vapour condenser; A1-air inlet; B1-medium voltage network fuel gas inlet; B2-high-pressure system fuel gas inlet; C1-exhaust-heat boiler flue gas entrance; C2-exhaust heat boiler smoke exhaust port.
Embodiment
Embodiment 1:
The present embodiment power generation system structure as shown in Figure 1.
In gas turbine subtense angle, middle pressure combustion gas turbine 13 is coaxial with one-level gas compressor 11, and high-pressure gas turbine 23 is coaxial with two-stage compressor 21, combustion gas turbine and generator 10 and 20 connecting shaft; High-pressure system and medium voltage network adopt split axle to arrange;
In steam turbine subtense angle, three-pressure reheat formula exhaust heat boiler and steam turbine are set.Concrete structure is: water supply structure is divided into high, medium and low setting-out three tunnel, and steam turbine is provided with high-pressure cylinder 69, intermediate pressure cylinder 59 and low pressure (LP) cylinder 49.Vapour condenser 71 connects low-pressure pump 41, point two-way after pressurization, and a road connects water supply pump 31, inter cooler 30, HP steam drum 64 successively, is finally communicated with high-pressure superheater 65; Another road connects the low-pressure coal saver 42 in exhaust heat boiler, connects high, medium and low voltage three tunnel respectively afterwards.High pressure road through high-pressure economizer 62 before high-pressure water pump 61 connects successively, after high-pressure economizer 63, a last and cold water road is converged and is together accessed HP steam drum 64, then connects steam turbine high-pressure cylinder 69 through high-pressure superheater 65, and high-pressure cylinder 69 is vented and connects reheater 55; Middle pressure Lu Jingzhong water pump 51 presses economizer 52, middle pressure drum 53, middle pressure superheater 54 in connecting successively, converges, connect intermediate pressure cylinder 59 through reheater 55 with the exhaust of high-pressure cylinder, and intermediate pressure cylinder 59 is vented and connects low pressure (LP) cylinder 49 suction port; Low pressure road connects low-pressure drum 43, low-pressure superheater 44 successively, and converge with intermediate pressure cylinder 59 steam discharge and together access low pressure (LP) cylinder 49, low pressure (LP) cylinder 49 steam discharge enters condenser 71.Steam turbine drive electrical generators 40 outwards exports electric energy.
During the work of this power generation system, the air that excess coefficient is very large is entered by air inlet A1, through the two stage compression of one-level gas compressor 11 and two-stage compressor 21, also carries out cooling during rolling through an inter cooler 30 pairs of pressurized air therebetween.Excessive high-pressure air enters high compression combustion chamber 22 and burns under the rock gas that sprays into through the high-pressure system fuel gas inlet B2 hyperbaric environment at 14MPa, the flue gas of burning comprises the air do not reacted in a large number, and these high-temperature flue gas of 1325 DEG C promote high-pressure gas turbine 23 and energizes high-pressure level generator 20 exports electric energy.Flue gas after acting enters middle pressure burner room 12, mix in pressure ring border and through the rock gas that medium voltage network fuel gas inlet B1 sprays in 1.54MPa, burning reheats to 1325 DEG C of high temperature, combustion gas turbine 13 is pressed to drive medium pressure grade generator 10 to export electric energy in promotion, exhaust enters exhaust heat boiler heating high-pressure superheater 65 successively through exhaust-heat boiler flue gas entrance C1, reheater 55, HP steam drum 64, middle pressure superheater 54, rear high-pressure economizer 63, middle pressure drum 53, low-pressure superheater 44, front high-pressure economizer 62, middle pressure economizer 52, after low-pressure drum 43 and low-pressure coal saver 42, discharge through exhaust heat boiler smoke exhaust port C2.
This operation of electric power system optimum configurations is: first class pressure 1.54MPa, and secondary pressure is 14MPa, and a cold temperature is 100 DEG C, and middle pressure combustion gas turbine intake temperature and high-pressure gas turbine intake temperature are 1325 DEG C; High, medium and low cylinder suction pressure in steam electric power subtense angle is set as 9.63MPa, 2.16MPa and 0.367MPa respectively, and corresponding intake temperature is set as respectively: 565.5 DEG C, 565.5 DEG C and 305 DEG C.Other Selecting parameter refer to table 6.
Embodiment 2:
This embodiment and embodiment 1 are distinguished as, and the high, medium and low cylinder air inlet intake temperature in steam electric power subtense angle are set as respectively: 540 DEG C, 540 DEG C and 305 DEG C; All the other structure and parameters and embodiment 1 are consistent substantially.
Embodiment 3:
The present embodiment power generation system structure as shown in Figure 2.This embodiment and embodiment 1 are distinguished as, and high-pressure system and medium voltage network adopt coaxially arranged; All the other structure and parameters and embodiment 1 are consistent.
Comparative example 1:
This comparative example uses common 9FA combined cycle system, runs, as baseline system of the present invention with reference to embodiment 1 optimum configurations.Design parameter setting and operation result are in table 6.
Comparative example 2:
This comparative example uses existing GT26 combined cycle system, runs with reference to embodiment 2 optimum configurations.Design parameter setting and operation result are in table 6.
Table 6 embodiment and comparative example service data contrast:
Above-described embodiment is not the exhaustive of embodiment; also can there is other embodiment; above-described embodiment object is the present invention is described, but not limits the scope of the invention, and all application come by simple change of the present invention all drop in protection scope of the present invention.
This patent specification use-case goes to show the present invention, comprising optimal mode, and those of ordinary skill in the art is manufactured and uses the present invention.This invents the content that delegatable scope comprises embodiment in the content of claims and specification and other embodiment.These other examples also should belong to the scope of claims of the present invention, as long as they contain the technical characteristics described by the identical written language of claim, or they include with claim without essence difference similar literal language described by technical characteristics.
All patents, the full content of patent application and other reference should be incorporated to present specification by reference.But if a term in the application conflicts mutually with the term including reference in, preferential with the term of the application.
All scopes disclosed herein all comprise end points, and are combine independently of one another between end points.
It should be noted that " first ", " second " or similar vocabulary do not represent any order, quality or significance, are only used to distinguish different technical characteristicss.The qualifier " approximately " used in conjunction with quantity comprises implication that described value and content context specify (such as: error when it includes measurement specific quantity).
Claims (19)
1. a high pressure reheating combined cycle generation system of fuel gas-steam, be made up of gas turbine subtense angle and steam turbine subtense angle, it is characterized in that: gas turbine subtense angle comprises medium voltage network and high-pressure system, medium voltage network comprises one-level gas compressor, middle pressure burner room and middle pressure combustion gas turbine, high-pressure system comprises two-stage compressor, high compression combustion chamber and high-pressure gas turbine, is provided with at least one grade of inter cooler between firsts and seconds gas compressor; During operation, excess air is by after described I and II gas compressor two stage compression, enters high compression combustion chamber combustion heating, and the high-temperature fuel gas of generation enters middle pressure burner room after high-pressure gas turbine, presses combustion gas turbine to do work after reheating in warp; Medium voltage network relief opening is communicated with steam turbine subtense angle, is vented and reclaims heat at steam turbine subtense angle;
Described steam turbine subtense angle comprises exhaust heat boiler and steam turbine, and described medium voltage network relief opening connects exhaust-heat boiler flue gas entrance; Described exhaust heat boiler and steam turbine are three-pressure reheat formula; Water supply structure is divided into high, medium and low voltage three tunnel, and feedwater can be absorbed heat by multiple fractionation in exhaust heat boiler; Described steam turbine is provided with high, medium and low cylinder pressure, is connected reheater between high-pressure cylinder with intermediate pressure cylinder, after high-pressure cylinder steam discharge enters reheater reheating, enters intermediate pressure cylinder acting;
By the high pressure water circuit of the cooling water access three-pressure reheat formula vapor recycle in a cold process; In corresponding power generation system, inter cooler cooling water is communicated with the HP steam drum in exhaust heat boiler, the high-pressure feed water that cooling water becomes components vaporize after inter cooler heat absorption enters HP steam drum, directly mix from the high-pressure feed water of steam turbine subtense angle with another part and vaporize, enter high pressure carbonated drink flow process.
2. power generation system according to claim 1, is characterized in that: described power generation system optimum configurations is, in medium voltage network, the air first class pressure after one stage of compression is 1.5-2.4MPa; In high-pressure system, the air secondary pressure after two-stage compression is 6-20MPa; Arrange one-level inter cooler, between air, cold temperature is 100-200 DEG C.
3. power generation system according to claim 2, is characterized in that: high-pressure gas turbine intake temperature is 1000-1500 DEG C, and middle pressure combustion gas turbine intake temperature is 1200-1500 DEG C.
4. the power generation system according to 1 to 3 arbitrary claim, is characterized in that: the cooling water of described inter cooler is communicated with described steam turbine subtense angle, reclaims the heat of cooling water.
5. power generation system according to claim 1, is characterized in that: the cooling water of described inter cooler accesses the high pressure water circuit of described steam turbine subtense angle.
6. power generation system according to claim 5, is characterized in that: the high, medium and low three road pressure of described steam turbine subtense angle are respectively 9.63MPa, 2.16MPa and 0.367MPa.
7. power generation system according to claim 6, it is characterized in that: described power generation system optimum configurations is, first class pressure 1.54MPa, secondary pressure 14MPa, between cold temperature 100 DEG C, high-pressure gas turbine intake temperature and middle pressure combustion gas turbine intake temperature are 1325 DEG C.
8. the power generation system according to 1 to 3 arbitrary claim, is characterized in that: described middle pressure combustion gas turbine is coaxial with one-level gas compressor, and described high-pressure gas turbine is coaxial with two-stage compressor, combustion gas turbine and generator connecting shaft.
9. power generation system according to claim 8, is characterized in that: described high-pressure system and medium voltage network adopt coaxially arranged or split axle layout, and during split axle, one-level gas compressor and two-stage compressor are distributed in disalignment.
10. a high pressure reheating integrated gas-steam combined cycle power plant method, step comprises:
Combustion gas circulates, and pressurized air and fuel mix are burnt, and the high-temperature fuel gas of generation makes the generating of turbine acting pushing generator, and exhaust imports vapor recycle recovery waste heat;
Vapor recycle, using combustion gas circulating exhaust waste heat as thermal source, is generated electricity by steam acting pushing generator;
It is characterized in that:
Described air is excess air, and compression process is two-stage, and air is depressed into first class pressure through one-level gas compressor, is depressed into secondary pressure through two-stage compressor;
Through the cold process of at least one inter-stage between described air two stage compression;
Add thermal process again in described combustion gas circulation, once combustion gas twice turbine acting in circulation, by the combustion gas reheating reduced by pressure after high-pressure gas turbine, then by middle pressure combustion gas turbine;
Use exhaust heat boiler and steam turbine in described vapor recycle, the exhaust in described combustion gas circulation is imported exhaust heat boiler recovery waste heat; Described vapor recycle is three-pressure reheat formula; The feedwater of high, medium and low voltage three tunnel is absorbed heat by exhaust heat boiler classification; Steam does work respectively in the high, medium and low cylinder pressure of described steam turbine, and the steam on high pressure road is discharged after high-pressure cylinder acting, enters intermediate pressure cylinder and again do work after reheating;
By the high pressure water circuit of the cooling water access three-pressure reheat formula vapor recycle in a cold process; In corresponding power generation system, inter cooler cooling water is communicated with the HP steam drum in exhaust heat boiler, the high-pressure feed water that cooling water becomes components vaporize after inter cooler heat absorption enters HP steam drum, directly mix from the high-pressure feed water of steam turbine subtense angle with another part and vaporize, enter high pressure carbonated drink flow process.
11. electricity-generating methods according to claim 10, is characterized in that: described air first class pressure is 1.5-2.4MPa, and secondary pressure is 6-20MPa; Arrange the cold process of an inter-stage, a cold temperature is 100-200 DEG C.
12. electricity-generating methods according to claim 11, is characterized in that: described high-pressure gas turbine intake temperature is 1000-1500 DEG C, and middle pressure combustion gas turbine intake temperature is 1200-1500 DEG C.
13. electricity-generating methods according to claim 10, is characterized in that: introduce in described vapor recycle by the cooling water of cold process between described, reclaim the heat of cooling water.
14. electricity-generating methods according to claim 10, is characterized in that: the cooling water of cold process between described is accessed the high pressure water circuit of described vapor recycle.
15. electricity-generating methods according to claim 14, is characterized in that: the high, medium and low three road pressure of described vapour-cycling are respectively 9.63MPa, 2.16MPa and 0.367MPa.
16. electricity-generating methods according to claim 15, is characterized in that: first class pressure 1.54MPa, secondary pressure 14MPa, a cold temperature 100 DEG C, and high-pressure gas turbine intake temperature and middle pressure combustion gas turbine intake temperature are 1325 DEG C.
17. electricity-generating methods according to 10 to 16 arbitrary claims, is characterized in that: arrange that described one-level gas compressor, two-stage compressor, middle pressure combustion gas turbine and high-pressure gas turbine all coaxially run.
18. electricity-generating methods according to 10 to 16 arbitrary claims, is characterized in that: arrange that described one-level gas compressor and middle pressure combustion gas turbine coaxially run, two-stage compressor and high-pressure gas turbine coaxially run on the second axis.
19. electricity-generating methods according to claim 18, is characterized in that: by one-level gas compressor and the isolated operation of middle pressure combustion gas turbine, or with two-stage compressor and high-pressure gas turbine cooperation.
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| CN201310722096.8A CN103711587B (en) | 2013-12-24 | 2013-12-24 | A kind of high pressure reheating combined cycle generation system of fuel gas-steam and electricity-generating method |
| PCT/CN2014/080217 WO2015096414A1 (en) | 2013-12-24 | 2014-06-18 | High-pressure reheating gas-steam combined cycle power generation system and power generation method |
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| CN103711587B (en) * | 2013-12-24 | 2016-03-23 | 国电新能源技术研究院 | A kind of high pressure reheating combined cycle generation system of fuel gas-steam and electricity-generating method |
| CN104074610B (en) * | 2014-06-24 | 2016-04-06 | 北京京桥热电有限责任公司 | The also vapour method of Combined cycle gas-steam turbine unit |
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