CN103711587A - High-pressure reheating gas-steam combined cycle power generation system and power generation method - Google Patents
High-pressure reheating gas-steam combined cycle power generation system and power generation method Download PDFInfo
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Abstract
The invention relates to a high-pressure reheating gas-steam combined cycle power generation system and a power generation method. The system consists of a gas turbine subsystem and a steam turbine subsystem, wherein the gas turbine subsystem comprises a device used for two-stage air compression, twice combustion as well as high-pressure and medium-pressure twice turbine acting; after primary acting of high-temperature gas, the high-temperature gas enters a medium-pressure combustion chamber and is reheated for secondary acting, so that the average heat absorption temperature of the whole cycle is improved; and at least a one-stage intercooler is arranged between two-stage compressors, and heat flow of the intercooler is connected with the two-stage compressors. The steam turbine subsystem adopts a three-pressure reheating type boiler and a steam turbine, cooling water of the intercooler is connected with high-pressure water, and high-pressure, medium-pressure and low-pressure water as well as the cooling water of the intercooler absorb heat in a staged manner for multiple times, so that heat energy is efficiently utilized. When the high-pressure reheating gas-steam combined cycle power generation system provided by the invention operates with the best parameters, the combined cycle efficiency is increased by 3-5 percentage points compared with a combined cycle system which mainly adopts a gas turbine class F, and the single-machine output power is increased by more than 70%, and reaches 800MW class.
Description
Technical field
The present invention relates to a kind of Gas-steam Combined Cycle electricity generating device, particularly a kind of high pressure hot combined cycle generation system of fuel gas-steam again.The invention still further relates to the electricity-generating method that can use this power generation system.
Background technique
The problems such as the most frequently used vapor recycle mode of traditional thermal power generation is Rankine cycle (Rankine Cycle), and still the generation technology based on Rankine cycle exists generating efficiency low, and 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 the non-renewable and environmental problem of coal and petroleum resources makes researcher that increasing sight is invested on energy-conservation, clean generation technology.Gas turbine is a kind of employing brayton cycle (Brayton Cycle), take the thermodynamic apparatus that air and combustion gas be working medium, gas turbine and combined cycle thereof have pollute low, power supply efficiency is high and the feature such as load adjustment wide ranges, 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 advanced gas turbine technology as the scientific and technological Priority setting of this country with the emphasis researched and developed of key technology.
Some famous gas turbine MANUFACTURER have been succeeded in developing a series of advanced in performance units in the world.The 9FA of RuGE company, the GT26 of ABB AB etc.These unit single-machine capacitys are more than 200MW, and combustion gas initial temperature reaches more than 1260-1300 ℃, pressure ratio 10-30, and simple cycle efficiency is 40% left and right.In order further to improve the efficiency of power generating equipment, use a kind of new generation technology---Gas-steam Combined Cycle (GTCC:Gas Turbine Combined Cycle), the brayton cycle circulation of steam turbine Rankine cycle and gas turbine is combined, the average endothermic temperature height of gas turbine cycle and the low advantage of the average exothermic temperature of steam turbine have been utilized simultaneously, both shortcomings have been overcome again, so cycle efficiency is much higher than independent gas turbine or steam turbine generator set.At present, gas turbine forms combined cycle behind efficiency and surpasses 55%, and the combined cycle system efficiency forming as 9FA can reach 56.7%, and the KA26 combined cycle system efficiency that GT26 forms surpasses 58%.
On the basis of the Gas-steam Combined Cycle that is representative at F level gas turbine, combined cycle efficiency also has the space promoting by a relatively large margin.And for GT26 system, it has adopted sequential combustion device (Sequential Combustion Systems), utilized reheat vapor cycle, realized higher pressure ratio, by one group of 22 grades of efficient subsonic compressor, air is pressed into annular environmental protection firing chamber to double the high pressure of conventional combustion machine pressure ratio, technological requirement to combustion machine equipment is high, involves great expense.
Summary of the invention
The present invention has developed the electricity-generating method of existing Gas-steam Combined Cycle, the association circulating power generation system that is representative for the existing 9FA of take level combustion machine combined cycle system improves, in combustion gas circulation, add high pressure heat and middle cooling procedure again, and improve in vapor recycle mode for the utilization of a cold and hot amount, make this power generation system combined cycle efficiency than take F level gas turbine as 3 to 5 percentage points of main combined cycle raisings, unit output power improves more than 70%, reaches 800MW level; The present invention provides improved high pressure hot Gas-steam Combined Cycle electricity-generating method more simultaneously.
For realizing above goal of the invention, the present invention transforms existing 9FA combustion machine combined cycle, adds high pressure heat and middle cooling two processes again in the original simple brayton cycle of gas turbine, forms the gas turbine engine systems that carries 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 existing 9FA and the contrast of GT26 combined cycle system, compares existing system, and the present invention is than the obvious increase of merit, and whole cycle efficiency also can obtain certain lifting.
Technological scheme of the present invention is specially:
(1) the inventive method is, step comprises:
Combustion gas circulation.Take brayton cycle as basis, pass into pressurized air and fuel mix burning, 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, with one-level gas compressor, is depressed into first class pressure, with two-stage compressor, is depressed into secondary pressure, and this pressure is the maximum pressure after air compressing; The cold process of at least one inter-stage of process between air two stage compression; In described combustion gas circulation, add thermal process again, once twice turbine acting of combustion gas in circulation, the combustion gas by pressure decreased after high-pressure gas turbine is hot again, then by middle pressure combustion gas turbine.
Vapor recycle.Take Rankine cycle as basis, using combustion gas circulating exhaust waste heat as thermal source, by steam acting pushing generator, generated electricity.
A kind of power generation system based on this electricity-generating method, by gas turbine subtense angle and steam turbine subtense angle, formed, gas turbine subtense angle comprises medium voltage network and high-pressure system, medium voltage network comprises one-level gas compressor, middle pressure burner chamber 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 sequentially, by after described I and II gas compressor two stage compression, enters high compression combustion chamber combustion heating, enters middle pressure burner chamber after high-temperature fuel gas high pressure turbine, then intermediate pressure turbine acting after heat; Medium voltage network relief opening is communicated with steam turbine subtense angle, and exhaust is reclaimed heat at steam turbine subtense angle.
(2) according to power generation system and method (1) described, it is 1.5-2.4MPa that air first class pressure is set during operational system, and secondary pressure is 6-20MPa; The cold process of one inter-stage is set, and a cold temperature is 100-200 ℃.
(3) according to power generation system and method (2) described, during operational system, parameter is further set to, and described high-pressure gas turbine intake temperature is 1000-1500 ℃, and middle pressure combustion gas turbine intake temperature is 1200-1500 ℃.
(4) according to power generation system and method described in (1) to (3) any one, for further improving combined cycle efficiency, the cooling water of cold process between described is introduced in described vapor recycle to the heat exchanging while 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), according to power generation system and method described in (1) to (4) any one, the steam turbine subtense angle that carries out vapor recycle in power generation process is used 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, and normally the heat exchange tube bundle such as drum, economizer, vaporizer, superheater and header and container etc. form.
(6), according to power generation system and method described in (1) to (5) any one, in power generation process, further use three to press reheat type exhaust heat boiler and steam turbine; Three pressure type water supply structures are divided into high, medium and low setting-out three tunnels, and feedwater is classification heat absorption in exhaust heat boiler, have passed through the overheated three phases of heating, saturation water evaporation and the saturated vapour of water; Steam turbine is provided with three cylinders of high, medium and low voltage, between high-pressure cylinder relief opening and intermediate pressure cylinder suction port, is connected the reheater in exhaust heat boiler, and high-pressure cylinder steam discharge again after heat, enters intermediate pressure cylinder acting through reheater.
(7), according to power generation system and method (6) described, the cooling water access three in a cold process is pressed to the high pressure water circuit of reheat type vapor recycle.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 part vaporization after inter cooler heat absorption enters high pressure drum, directly from the high-pressure feed water of steam turbine subtense angle, mix vaporization with another part, enter high pressure carbonated drink flow process.Due to adding of a cold water, the three high-pressure feed water amounts in feedwater of pressing improve a lot, and hot water supply system is high again for more general three pressures of high-pressure feed water proportion.
(8) according to power generation system and method described in basis (6) to (7) any one, in described vapour-cycling, high, medium and low three road pressure are set to respectively 9.63MPa, 2.16MPa and 0.367MPa.
(9) according to power generation system and method (8) described, first class pressure 1.54MPa is set, secondary pressure 14MPa, 100 ℃ of cold temperature, high-pressure gas turbine intake temperature and middle pressure combustion gas turbine intake temperature are 1325 ℃.Now, the combined cycle efficiency of described power generation system is the highest.
(10) according to power generation system and method described in (1) to (9) any one, the middle pressure combustion gas turbine and the one-level gas compressor that belong to medium voltage network is 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 arrange, and make high pressure, middle pressure combustion gas turbine and two stage compressor all coaxial; Also can split axle setting, one-level gas compressor and two machine gas compressors are distributed in disalignment, coaxial with middle pressure combustion gas turbine and high-pressure gas turbine respectively separately, form independently high-pressure system and medium voltage network, when split axle arranges, during system operation, can whether start high-pressure system by the flexible selection of load, can avoid gas compressor to be put into the situation that causes gas turbine to drag on the same axis, reduce and start difficulty simultaneously.
For the concrete selection of described vapor recycle subtense angle, general, when gas turbine is when under rated power, delivery temperature is lower than 538 ℃, adopt single press or multiple pressures without the boiler circuit of heat again; When combustion turbine exhaustion temperature is during higher than 538 ℃, can adopt the boiler circuit of reheat vapor cycle; When combustion turbine exhaustion temperature is during higher than 593 ℃, can adopt the boiler circuit of three pressure reheat vapor cycles.The present invention uses 9FA level gas turbine as benchmark, and delivery temperature is 650 ℃, has therefore selected three to press reheat type steam circulation.
For the Operational Limits in power generation system of the present invention and method, the present invention is directed to high pressure hotter Gas-steam Combined Cycle carry out parameter optimization, find the parameter of the optimization based on system of the present invention operation, reach best combined cycle efficiency.
The present invention uses aspen plus software to carry out modeling to current 9FA level combustion and steam Combined Cycle Unit, GT26 unit and power generation system of the present invention, by computational analysis, power generation system of the present invention is carried out to parameter optimization, determines best operating mode.
Before systematic simulation calculation of the present invention, first existing 9FA level combustion and steam Combined Cycle Unit, GT26 unit are carried out to modeling.
During system simulation, adopt ISO operating mode, 15 ℃ of ambient temperatures, atmospheric pressure 0.10135MPa, relative humidity of atomsphere 60%.The Operational Limits of announcing with reference to 9FA system, determines that inlet air parameter is 0.1MPa/15 ℃/678.5kg/s, and after compressor compresses, combustion gas parameter is 1.54MPa/404.5 ℃/678.5kg/s, and entrance combustion gas parameter is 1.54MPa/15 ℃/16.8kg/s; It is 1.54MPa/1325 ℃/695.3kg/s that burning generates high-temperature fuel gas parameter, and the tail gas parameter after combustion gas turbine is 0.105MPa/650 ℃/695.3kg.The acting of combustion machine is 314MW.Vapor portion is three pressure reheat types, and pressure rank is respectively 9.63MPa, 2.16MPa, 0.367MPa.High-pressure cylinder steam inlet condition is 9.63MPa/540 ℃/90.8kg/s; 2.16MPa/321 ℃/90.8kg/s of high-pressure cylinder steam discharge parameter; 2.16MPa/540 ℃/104.2kg/s of intermediate pressure cylinder steam inlet condition; 0.367MPa/300.3 ℃/121.5kg/s of low pressure (LP) cylinder steam inlet condition; 0.00484MPa/35.5 ℃/121.5kg/s of steam discharge parameter.The total output work of steam turbine is 160.7MW.
Analog result is gathered and contrast with existing 9FA level association system parameter, as shown in table 1.
Table 1: existing 9FA system and the contrast of aspen analog parameter
| 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 machine 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, and parameters is more approaching, and simulation comparatively meets existing 9FA system, so the present invention selects the 9FA system of aspen simulation as baseline system.
For GT26 system, basis of reference system is carried out parameter setting, and analog result and the contrast of existing GT26 system are as shown in table 2.
Table 2: existing GT26 system and the contrast of aspen analog parameter
| Project | Existing GT26 system | Aspen analog system |
| Air mass flow | 545.6kg/s | 540kg/s |
| Gas discharge | 16.4kg/s | 12.99kg/ |
| Pressure ratio | ||
| 30 | 30 | |
| Combustion gas turbine intake temperature | 1255℃ | 1235℃ |
| Reheat temperature | 1255℃ | 1235℃ |
| Delivery temperature | 630℃ | 605℃ |
| Combustion machine 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 is different from benchmark setting of the present invention, adopts after capacity, flow and the general configuration identical with system of the present invention, and GT26 efficiency in aspen simulation has also had rising, reaches 60.03%.
Generally, investigate aspen simulation and real system result, can think that Percent of contact area has reached parameter and analyzed requirement.
In analog computation process, there are three parameters to have significant impact to the integrated combination cycle efficiency of system of the present invention: first class pressure, secondary pressure and a cold rear air temperature.By variable element, test and carry out parameter optimization, thereby find out, make most effective optimum value.Table 3 is depicted as most effective relevant parameter.
Table 3: most effective relevant parameter table
Known by 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 ℃, moving system of the present invention all has preferably combined cycle efficiency.
Preferably, when first class pressure is 1.5-2MPa, secondary pressure is 9-18MPa, between 100 ℃ of cold temperature, system of the present invention is when this parameter section operation, and combined cycle efficiency is higher than 60.36%, is better than using 60.03% efficiency value of the GT26 system of baseline system parameter of the present invention;
Further preferred, when first class pressure is 1.54MPa, when secondary pressure is 14MPa, system combustion engine efficiency of the present invention can reach 42.96%, and it is the highest by 61.22% that combined cycle efficiency reaches.
After optimal parameter is analyzed, carry out Variable Condition Analysis.There is high and medium voltage two-stage system in system of the present invention, thereby adjusts respectively high, middle pressure combustion gas turbine intake temperature, can obtain the efficiency of system under different operating modes.By to the gathering of data, converged into table 4.
Table 4: the efficiency at different high pressure temperature
Known by data in table 4, high-pressure gas turbine intake temperature is 1000-1500 ℃, and when middle pressure combustion gas turbine intake temperature is 1200-1500 ℃, system of the present invention has preferably combined cycle efficiency.
Preferably, when selecting, high and medium voltage combustion gas turbine intake temperature is identical, soon combustion gas hotter burning makes it to reply the intake temperature of first turbine, and when control temperature is 1325 ℃, can obtain the highest cycle efficiency relatively, now total output work 817MW of combined cycle system, fires engine efficiency 42.96%, and combined cycle efficiency reaches 61.22%.It should be noted that, although shown in table 4, high pressure temperature is increased to 1500 ℃ and can obtains higher efficiency, but this temperature has exceeded the F level combustion machine scope of benchmark of the present invention, and improve temperature system process is had to more harsh requirement, bring extra cost, therefore improve temperature with obtain high efficiency be not more native system invented party to, therefore do not select 1500 ℃ of data, 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 machine unit, and high-pressure system can be considered the high-pressure section of extra increase.Can isolated operation medium voltage network during low-load, now, system class of the present invention is similar to common 9FA level Combined Cycle Unit.
In sum, system of the present invention has following main feature:
1. high pressure is warm again.The present invention has used heat structure again, different from the common group of heat engine again, and air high-pressure during system optimum operation of the present invention is up to 14MPa, far above common F level combustion machine (1.5-2MPa) and heat engine group (3MPa left and right) again.The present invention arranges one-level gas compressor compressed air pressure to common combustion machine pressure rank, the high pressure rank that two-stage compressor pressurized air requires to the present invention;
2. inter cooler heat recovery.Because the present invention has adopted the high pressure of 14MPa, greatly increase the heat loss in air compressing process.Thereby native system is provided with inter cooler, reduction two-stage compressor inlet air temperature, minimizing compressor wasted work.In addition, in order to utilize this part heat, native system is provided with inter cooler heat recovery part, the cooling water of inter cooler is introduced to exhaust heat boiler and be used, and makes cycle efficiency higher;
3. split axle is arranged.The present invention can select high-pressure system and medium voltage network split axle to arrange.By high-pressure system, with separated in 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 while being distributed on same axle, gas turbine cannot drag, and reduce gas burning system and start difficulty.
The present invention compares with common F level Combined Cycle Unit.The present invention has increased heat and a cold circulation means again, and during operation, the maximum pressure of air compressing is far above common F level unit, and during optimum efficiency operation, efficiency exceeds more than 3 percentage points than common F level unit, and single-machine capacity exceeds 73%, reaches 817MW.
The present invention compares with GT26 unit.GT26 use subsonic compressor by air first compression to the conventional combustion machine pressure ratio (3MPa) of twice, apparatus and process is required very high, involve great expense; The present invention adopts and is with intercooled two stage compression, by air compressing 14MPa, realizes more high pressure ratio, is but easy to realization and cost lower in structure.GT26 is pressed into annular environmental protection firing chamber by air to double the high pressure of conventional combustion machine pressure ratio by one group of 22 grades of efficient subsonic compressor, without middle cooling, involves great expense.Meanwhile, the design of environmental protection firing chamber can reduce the discharge amount of NOx.The present invention has increased reheat vapor cycle and middle cool cycles in the simple combustion gas round-robin basis of existing 9FA gas turbine, and what system adopted is " machine group " that many combustions of multiaxis machine unit forms, technical more easily realization, and cost is lower.Efficiency 60.03% with GT26 when moving under base condition of the present invention is compared, system effectiveness height of the present invention 1.2 percentage points, compare with the GT26 system of actual motion, it is more that efficiency improves.
The present invention owing to moving near optimal parameter, improved combined cycle efficiency, when sending same charge, the more common F level of gas consumption gas Combined Cycle Unit has certain minimizing, thereby the more common unit of cost of electricity-generating also has certain reduction, table 5 contrasts novel high-pressure re-heating subsystem and common F level combustion machine system by correlation computations, and in table, partial data adopts approximative value.
Table 5: economic analysis of the present invention
| ? | Unit | F level combustion machine 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 (comparing with F level combustion machine Combined Cycle Unit) | Ton mark coal | 0 | 54218.3 |
| Standard gas consumption rate | Nm3/kWh | 0.36 | 0.33 |
| Save rock gas quantity (comparing with F level combustion machine Combined Cycle Unit) year | Billion cubic meter | 0 | 7.08 |
| Rock gas cost saving | Ten thousand yuan | 0 | 20.1 |
| Reducing discharging CO2(year compares with F level combustion machine Combined Cycle Unit) | Ten thousand tons | 0 | 4.68 |
As shown in table 5, use system of the present invention to replace common combustion machine on a large scale, can effectively reduce fuel consumption, thereby 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 chamber; In 13-, press combustion gas turbine; 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-; In 52-, press economizer; In 53-, press drum; In 54-, press superheater; 55-reheater; 59-steam turbine intermediate pressure cylinder; 61-high-pressure water pump; High-pressure economizer before 62-; High-pressure economizer after 63-; 64-high pressure 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 shafts; High-pressure system and medium voltage network adopt split axle to arrange;
In steam turbine subtense angle, three pressure reheat type exhaust heat boiler and steam turbines are set.Concrete structure is: water supply structure is divided into high, medium and low setting-out three tunnels, 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, minute two-way after pressurization, and a road connects water supply pump 31, inter cooler 30, high pressure 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 respectively afterwards high, medium and low voltage three tunnels.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 high pressure drum 64, then connects steam turbine high-pressure cylinders 69 through high-pressure superheater 65, high-pressure cylinder 69 exhausts connect reheaters 55; Middle pressure Lu Jingzhong water pump 51 is pressed economizer 52, middle pressure drum 53, middle pressure superheater 54 in connecting successively, converges with the exhaust of high-pressure cylinder, through reheater 55, connects intermediate pressure cylinder 59, and intermediate pressure cylinder 59 exhausts connect low pressure (LP) cylinder 49 suction ports; Low pressure road connects low-pressure drum 43, low-pressure superheater 44 successively, converges and together accesses low pressure (LP) cylinder 49 with intermediate pressure cylinder 59 steam discharges, and low pressure (LP) cylinder 49 steam discharges enter condenser 71.Steam turbine drives outwards output electric energy of generator 40.
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 through 30 pairs of pressurized air of an inter cooler, carries out centre therebetween cooling.Excessive high-pressure air enter high compression combustion chamber 22 and the rock gas that sprays into through the high-pressure system fuel gas inlet B2 hyperbaric environment at 14MPa under burn, the flue gas of burning comprises the air not reacting in a large number, and these high-temperature flue gas of 1325 ℃ promote high-pressure gas turbine 23 and drive high pressure stage generator 20 output electric energy.Flue gas after acting enters middle pressure burner chamber 12, in the middle pressure ring border of 1.54MPa and the rock gas spraying into through medium voltage network fuel gas inlet B1 mix, burning reheats to 1325 ℃ of high temperature, in promotion, press combustion gas turbine 13 to drive medium pressure grade generator 10 output electric energy, exhaust enters exhaust heat boiler heating high-pressure superheater 65 successively through exhaust-heat boiler flue gas entrance C1, reheater 55, high pressure 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, through exhaust heat boiler smoke exhaust port C2, discharge.
This operation of electric power system parameter is set to: first class pressure 1.54MPa, and secondary pressure is 14MPa, and a cold temperature is 100 ℃, and middle pressure combustion gas turbine intake temperature and high-pressure gas turbine intake temperature are 1325 ℃; High, medium and low cylinder suction pressure in steam electric power subtense angle is set as respectively to 9.63MPa, 2.16MPa and 0.367MPa, and corresponding intake temperature is set as respectively: 565.5 ℃, 565.5 ℃ and 305 ℃.Other parameters select to refer to table 6.
Embodiment 2:
This embodiment and embodiment's 1 difference are the high, medium and low cylinder air inlet intake temperature in steam electric power subtense angle to be set as respectively: 540 ℃, 540 ℃ and 305 ℃; 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's 1 difference are that 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 is used common 9FA combined cycle system, with reference to embodiment's 1 parameter, operation is set, as baseline system of the present invention.Design parameter setting and operation result are in Table 6.
Comparative example 2:
This comparative example is used existing GT26 combined cycle system, with reference to embodiment's 2 parameters, operation is set.Design parameter setting and operation result are in Table 6.
Table 6 embodiment and the contrast of comparative example service data:
Above-described embodiment is not the exhaustive of embodiment; also can there is other embodiment; above-described embodiment object is to illustrate the present invention, but not limits the scope of the invention, and all application that 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 use the present invention.This invents delegatable scope and comprises the content of claims and the embodiment in specification and other embodiment's content.These other examples also should belong to the scope that patent right of the present invention requires, as long as they contain the described technical characteristics of the identical written language of claim, or they include and the similar literal language described technical characteristics of claim without essence difference.
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 of including reference in, preferential with the application's term.
All scopes disclosed herein all comprise end points, and between end points, are to combine independently of one another.
It should be noted that " first ", " second " or similar vocabulary do not represent any order, and quality or significance are just used for distinguishing different technical characteristicss.The implication that the qualifier " approximately " using in conjunction with quantity comprises described value and content context appointment (for example: it includes the error while measuring specific quantity).
Claims (23)
1. a high pressure hot combined cycle generation system of fuel gas-steam again, by gas turbine subtense angle and steam turbine subtense angle, formed, 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 chamber 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 by described I and II gas compressor two stage compression after, enter high compression combustion chamber combustion heating, the high-temperature fuel gas of generation enters middle pressure burner chamber after high-pressure gas turbine, then heat is by the acting of middle pressure combustion gas turbine; Medium voltage network relief opening is communicated with steam turbine subtense angle, and exhaust is reclaimed heat at steam turbine subtense angle.
2. power generation system according to claim 1, is characterized in that: described power generation system parameter is set to, and in medium voltage network, the air first class pressure after one-level compression is 1.5-2.4MPa; In high-pressure system, the air secondary pressure after two-stage compression is 6-20MPa; One-level inter cooler is set, and between air, cold temperature is 100-200 ℃.
3. power generation system according to claim 2, is characterized in that: high-pressure gas turbine intake temperature is 1000-1500 ℃, and middle pressure combustion gas turbine intake temperature is 1200-1500 ℃.
4. according to the power generation system described in 1 to 3 arbitrary claim, it is characterized in that: the cooling water of described inter cooler is communicated with described steam turbine subtense angle, reclaim the heat of cooling water.
5. power generation system according to claim 4, is characterized in that: 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.
6. power generation system according to claim 5, is characterized in that: described exhaust heat boiler and steam turbine are three pressure reheat types; Water supply structure is divided into high, medium and low voltage three tunnels, 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, between high-pressure cylinder and intermediate pressure cylinder, is connected reheater, and high-pressure cylinder steam discharge enters reheater again after heat, enters intermediate pressure cylinder acting.
7. power generation system according to claim 6, is characterized in that: the cooling water flow of described inter cooler accesses the high pressure water circuit of described steam turbine subtense angle.
8. power generation system according to claim 7, 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.
9. power generation system according to claim 8, it is characterized in that: described power generation system parameter is set to first class pressure 1.54MPa, secondary pressure 14MPa, between 100 ℃ of cold temperature, high-pressure gas turbine intake temperature and middle pressure combustion gas turbine intake temperature are 1325 ℃.
10. according to the power generation system described in 1 to 3 arbitrary claim, it 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.
11. power generation systems according to claim 10, 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.
12. 1 kinds of high pressure are hot Gas-steam Combined Cycle electricity-generating method again, and step comprises:
Combustion gas circulation, pressurized air and fuel mix burning, the high-temperature fuel gas turbine acting pushing generator generating of generation, 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, through two-stage compressor, is depressed into secondary pressure;
The cold process of at least one inter-stage of process between described air two stage compression;
In described combustion gas circulation, add thermal process again, once twice turbine acting of combustion gas in circulation, the combustion gas by pressure decreased after high-pressure gas turbine is hot again, then by middle pressure combustion gas turbine.
13. electricity-generating methods according to claim 12, is characterized in that: described air first class pressure is 1.5-2.4MPa, and secondary pressure is 6-20MPa; The cold process of one inter-stage is set, and a cold temperature is 100-200 ℃.
14. electricity-generating methods according to claim 13, is characterized in that: described high-pressure gas turbine intake temperature is 1000-1500 ℃, and middle pressure combustion gas turbine intake temperature is 1200-1500 ℃.
15. according to the electricity-generating method described in 12 to 14 arbitrary claims, it is characterized in that: the cooling water of cold process between described is introduced in described vapor recycle to the heat of cooling water between recovery.
16. electricity-generating methods according to claim 15, is characterized in that: in described vapor recycle, use exhaust heat boiler and steam turbine, the exhaust in described combustion gas circulation is imported to exhaust heat boiler recovery waste heat.
17. electricity-generating methods according to claim 16, is characterized in that: described vapor recycle is three pressure reheat types; High, medium and low voltage three tunnel feedwater are 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, then after heat, enters intermediate pressure cylinder and again do work.
18. electricity-generating methods according to claim 17, is characterized in that: the high pressure water circuit that the cooling water flow of cold process between described is accessed to described vapor recycle.
19. electricity-generating methods according to claim 18, 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.
20. electricity-generating methods according to claim 19, is characterized in that: first class pressure 1.54MPa, and secondary pressure 14MPa, 100 ℃ of cold temperature, high-pressure gas turbine intake temperature and middle pressure combustion gas turbine intake temperature are 1325 ℃.
21. according to the electricity-generating method described in 12 to 14 arbitrary claims, it is characterized in that: arrange all coaxial operations of described one-level gas compressor, two-stage compressor, middle pressure combustion gas turbine and high-pressure gas turbine.
22. according to the electricity-generating method described in 12 to 14 arbitrary claims, it is characterized in that: arrange that described one-level gas compressor and middle pressure combustion gas turbine coaxially move, two-stage compressor and high-pressure gas turbine be coaxially operation on another axle.
23. electricity-generating methods according to claim 22, 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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| 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) | 2016-03-23 |
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