CN203685319U - Double-turbine combined-cycle combined heat and power supplying system - Google Patents
Double-turbine combined-cycle combined heat and power supplying system Download PDFInfo
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- CN203685319U CN203685319U CN201320853500.0U CN201320853500U CN203685319U CN 203685319 U CN203685319 U CN 203685319U CN 201320853500 U CN201320853500 U CN 201320853500U CN 203685319 U CN203685319 U CN 203685319U
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Abstract
The utility model provides a double-turbine combined-cycle combined heat and power supplying system. The double-turbine combined-cycle combined heat and power supplying system comprises a gas turbine, a main turbine, a waste heat boiler and a heating network steam extracting system; the waste heat boiler is connected with a smoke exhaust pipeline of the gas turbine; high, medium and low pressure steam which is generated through smoke exhaust waste heat of the gas turbine is respectively injected into a high pressure cylinder, a medium pressure cylinder and a lower pressure cylinder of the main turbine to work and drive an electric generator to output electric energy; a steam exhaust opening of the high pressure cylinder which is connected with a high discharging check valve is then connected with a first safety valve; a downstream of the first safety valve is connected with two branches; the first branch which is provided with a first adjusting valve is connected with a medium pressure steam pocket of the waste heat boiler; the second branch which is provided with a shut-off valve and a second adjusting valve is connected with a small back pressure type turbine; a steam exhaust opening of the small back pressure type turbine is connected with the second safety valve; a downstream of the second safety valve is connected with a check valve; the check valve is connected with the heating network steam extracting system. The double-turbine combined cycle combined heat and power supplying system solves the problem that traditional combined heat and power generation turbine steam exhaust point parameters are not matched with requirements of heat consumers and improves the energy utilization efficiency.
Description
Technical field
The utility model relates to Gas-steam Combined Cycle technical field, particularly relates to the cogeneration system of a kind of pair of turbine, combined cycle.
Background technique
Turbo-generator Set is a kind of energy conversion device that thermal power transfer is become to mechanical energy and then convert electric energy to, is one of crucial power equipment in power plant construction.The high temperature, the high pressure steam that are produced by boiler, through steam turbine, by heat energy and pressure potential conversion, become the mechanical energy of steam turbine, drive the acting of turbine rotor output shaft, this mechanical energy passes to generator by turbine rotor output shaft, thereby converts mechanical energy to electric energy, therefore, steam turbine is often called as " source of light " as source motivation.
Gas-steam combined cycle system refers to using gas turbine as preposition turbine, reclaims the exhaust heat of combustion machine with exhaust heat boiler, and some grades of initial steams of output inject steam turbine, and steam expands to do work and exports electric energy in steam turbine.
Gas-steam Combined Cycle combines having the gas turbine of higher average endothermic temperature and having compared with the steam turbine of harmonic average exothermic temperature, make the high-temperature tail gas of gas turbine enter exhaust heat boiler generation steam, and make steam in steam turbine, continue work done generating, reach the object of maximizing favourable factors and minimizing unfavourable ones, mutually making up, the heat energy utilization level of whole combined cycle is significantly improved compared with simple cycle, and the net efficiency of combined cycle generation has reached 48%～60%.
What at present conventional gas-steam combined cycle system had that two that E level circulating power station extensively adopts press, adopt without re-heating subsystem and F level circulating power station three press, re-heating subsystem.The former generates electricity net efficiency in 50% left and right, and the latter generates electricity net efficiency in 58% left and right.And the combined cycle of higher level is also to adopt three pressures, re-heating subsystem, its generating efficiency can reach more than 60%.
Due to the leading role of national policy, Gas-steam Combined Cycle, Cogeneration Project had been widely used in recent years.So-called heat (cold) Electricity Federation is produced and is referred to, extract a part of steam out for factory steam in suitable position, the through-flow inside of steam turbine, original intention is to realize the rational gradient utilization of the energy.The combined cycle efficiency of cogeneration of heat and power can arrive 70% left and right.
But taking the main flow Gas-steam Combined Cycle of existing market, cogeneration technology as example, prior art also comes with some shortcomings.(so-called two drag a type configuration to refer to the exhaust heat energy that reclaims respectively two combustion machines with two exhaust heat boilers to suppose H level gas Combined turbine cycle group that certain engineering thermoelectricity plant will go up a cover two and drag a type configuration, and the initial steam producing is injected to a steam turbine): the steam demand of user side is 1.2MPa, 185 DEG C, steam flow is specified 150t/h, is 200t/h to the maximum; And the parameter of typical three pressures, the heat integration circulatory system again arranges as follows:
High pressure steam parameter is 17MPa, 600 DEG C;
Heat (pressing) steam parameter is 3.5MPa again, 600 DEG C;
Low pressure steam parameter is 0.45MPa, 240 DEG C;
The combined cycle of prior art, cogeneration system design are rotating barrier or a seat cylinder valve to be set at Steam Turbine Through IP Admission through-flow 1.2MPa left and right place realize adjusting and draw gas, the temperature of this place's steam is 480 DEG C of left and right, and user's temperature requirements is only 185 DEG C, realize with user side ground steam parameter and mating by temperature-decreased pressure reducer, exist the temperature difference waste of 195 DEG C, thereby inevitably occurred the phenomenon of high-quality energy waste; In addition, without under thermal condition, the steam in Steam Turbine Through IP Admission IP still will flow through described rotating barrier or seat cylinder valve, thus there is restriction loss; Also have, because of the setting of described rotating barrier or seat cylinder valve, make the span of steam-turbine unit larger, be subject to the restriction of span, in through-flow when design of traditional cogeneration turbine unit, can only be selected to adopt relatively high root footpath and relative few through-flow progression, thereby makes the through-flow internal efficiency design load of unit on the low side; Therefore, the generating efficiency of traditional cogeneration turbine is relatively low.
Summary of the invention
The shortcoming of prior art in view of the above, the technical problems to be solved in the utility model is to provide that a kind of steam-turbine unit internal efficiency is high, the two turbines that can avoid high-quality energy waste, the cogeneration system of combined cycle, to overcome the above-mentioned defect of prior art.
In order to solve the problems of the technologies described above, the utility model provides the cogeneration system of a kind of pair of turbine, combined cycle, comprises gas turbine, main steam turbine, exhaust heat boiler, heat supply network steam bleeding system; The smoke-exhaust pipeline of gas turbine connects described exhaust heat boiler, and described exhaust heat boiler comprises high pressure drum, middle pressure drum and low-pressure drum; Described main steam turbine comprises high-pressure cylinder, intermediate pressure cylinder and low pressure (LP) cylinder; Described high pressure drum connects the high-pressure admission pipeline of described high-pressure cylinder, described middle pressure drum connect described intermediate pressure cylinder in compress into steam pipe road, described low-pressure drum connects the low pressure admission pipeline of described low pressure (LP) cylinder; The steam-expelling port of described high-pressure cylinder connects high row's check valve, and described heat supply network steam bleeding system is located at the downstream of described high row's check valve;
Described high row's check valve connects the first safety valve, and described the first safety valve downstream connects two branch roads, and the first branch road connects the steam line of described middle pressure drum, and described the first branch road is provided with the first modulating valve; The second branch road connects a little back pressure turbine, on described the second branch road, be provided with successively a shut-off valve and the second modulating valve by upstream to downstream, the steam-expelling port of described little back pressure turbine connects the second safety valve, described the second safety valve downstream connects an one-way valve, and described one-way valve connects described heat supply network steam bleeding system.
Alternatively, described main steam turbine and described little back pressure turbine adopt split axle to arrange.
Alternatively, described main steam turbine and described little back pressure turbine adopt single shaft to arrange, between the rotor of output shaft axle of described main steam turbine and the rotor of output shaft axle of described little back pressure turbine, are provided with a self-synchronizing clutch.
Preferably, the speed governing steam valve on the admission pipeline that described the second modulating valve is described little back pressure turbine, the main stop valve that described shut-off valve is described little back pressure turbine.
Alternatively, described main steam turbine comprises one or two low pressure (LP) cylinder, and described main steam turbine is the structure that high intermediate pressure cylinder closes cylinder, low pressure (LP) cylinder double split flow.
Alternatively, described main steam turbine comprises that a high-pressure cylinder and a mesolow close cylinder, and described main steam turbine is that high-pressure cylinder divides separately cylinder, mesolow cylinder cylinder combined structure.
Preferably, described low pressure admission pipeline is provided with a low pressure admission valve group, compresses into steam pipe road in described and is provided with one and compresses into steam valve group, and described high-pressure admission pipeline is provided with a high-pressure admission valve group.
Preferably, on described high-pressure admission pipeline, be provided with a bypass duct that connects described the first branch road in the upstream of described high-pressure admission valve group; On blow-off line between the steam-expelling port of described high-pressure cylinder and described high row's check valve, be also provided with a bypass duct, in described, compress on steam pipe road and be also provided with a bypass duct in described upstream of compressing into steam valve group, on described low pressure admission pipeline, be also provided with a bypass duct in the upstream of described low pressure admission valve group, the bypass duct of compressing on steam pipe road and on described low pressure admission pipeline on the blow-off line of described high-pressure cylinder, in described is all connected with the vapour condenser of described main steam turbine; Article four, the common composition of described bypass duct one bypath system, is respectively equipped with a valve on four described bypass ducts.
Preferably, on described low pressure admission pipeline, be provided with a modulating valve group in the upstream of described low pressure admission valve group.
As mentioned above, the cogeneration system of the of the present utility model pair of turbine, combined cycle, has following beneficial effect:
1, avoided high-quality energy waste, the internal efficiency of steam-turbine unit is improved.
2, the draw gas adjustment of parameter does not affect main steam turbine, only affects little back pressure turbine, be conducive to realize the standardized production of main steam turbine, and the standardization of main steam turbine is conducive to reduce manufacture cost, shortens delivery date, saves social resources.
Brief description of the drawings
Fig. 1 is shown as the wiring schematic diagram of the cogeneration system of of the present utility model pair of turbine, combined cycle.
Fig. 2 is shown as the main steam turbine of cogeneration system and the view of little back pressure turbine single shaft layout of of the present utility model pair of turbine, combined cycle.
Element numbers explanation
1 main steam turbine 1.1 high-pressure admission valve groups
In 1.2, compress into steam valve group 1.3 low pressure admission valve groups
1.4 high row's check valve 1.5 modulating valve groups
2 exhaust heat boiler 2.1 high-pressure superheaters
2.2 high pressure steam generator 2.3 high-pressure economizers
In 2.4, press superheater 2.5 medium pressure steam generators
In 2.6, press economizer 2.7 low-pressure superheaters
2.8 low-pressure steam generator 2.9 low-pressure coal savers
2.10 oxygen-eliminating device 2.11 gas turbine smoke-exhaust pipelines
3 little back pressure turbine 3.1 shut-off valves
3.2 second modulating valve 3.3 one-way valves
3.4 second safety valve 4 heat supply network steam bleeding systems
4.1 first modulating valve 4.2 first safety valves
5 vapour condenser 5.1 hot wells
6 water charging system 7 condensate pumps
7.1 low pressure feed water pump 7.2 high pressure feed water pumps
8 first generator 9 bypath systems
9.1 valve 9.2 valves
9.3 valve 9.4 valves
10 second generator 11 self-synchronizing clutches
HP high-pressure cylinder IP intermediate pressure cylinder
LP low pressure (LP) cylinder
Embodiment
By particular specific embodiment, mode of execution of the present utility model is described below, person skilled in the art scholar can understand other advantages of the present utility model and effect easily by the disclosed content of this specification.
Refer to Fig. 1 to Fig. 2.Notice, appended graphic the illustrated structure of this specification, ratio, size etc., all contents in order to coordinate specification to disclose only, understand and read for person skilled in the art scholar, not in order to limit the enforceable qualifications of the utility model, therefore the not technical essential meaning of tool, the adjustment of the modification of any structure, the change of proportionate relationship or size, do not affecting under effect that the utility model can produce and the object that can reach, all should still drop on the technology contents that the utility model discloses and obtain in the scope that can contain.Simultaneously, in this specification, quote as " on ", the term of D score, " left side ", " right side ", " centre " and " " etc., also only for ease of understanding of narrating, but not in order to limit the enforceable scope of the utility model, the change of its relativeness or adjustment, changing under technology contents, when being also considered as the enforceable category of the utility model without essence.
In view of combined cycle, the cogeneration system of prior art are kept away unavoidable high-quality energy waste phenomenon, and cause steam-turbine unit decrease in efficiency; Inventor of the present utility model designs the cogeneration system of a kind of pair of turbine, combined cycle, make the high-pressure cylinder steam discharge of main steam turbine in the time going to heat supply network steam bleeding system, through a little back pressure turbine; the back pressure of little back pressure turbine can be made as the demand pressure of heat supply network user side; draw gas thereby realize one-level adjustment; and the electric energy of little back pressure turbine outside can drawing generator amount of exports, avoid high-quality energy waste, energy loss is few; In addition, in main steam turbine of the present utility model is through-flow, without rotating barrier or built-in type steam pumping regulating valve are set, therefore the internal efficiency of main steam turbine unit is high.
To the cogeneration system of of the present utility model pair of turbine, combined cycle be elaborated by specific embodiment below.
As shown in Figure 1, the cogeneration system of a kind of pair of turbine, combined cycle, comprises gas turbine, main steam turbine 1, exhaust heat boiler 2, heat supply network steam bleeding system 4.
Described main steam turbine 1 comprises high-pressure cylinder HP, intermediate pressure cylinder IP and low pressure (LP) cylinder LP; Described exhaust heat boiler 2 comprises high pressure drum, middle pressure drum and low-pressure drum, described high pressure drum comprises high-pressure superheater 2.1, high pressure steam generator 2.2, high-pressure economizer 2.3, described middle pressure drum comprises middle pressure superheater 2.4, medium pressure steam generator 2.5, middle pressure economizer 2.6, and described low-pressure drum comprises low-pressure superheater 2.7, low-pressure steam generator 2.8, low-pressure coal saver 2.9.
Described exhaust heat boiler 2 is connected with the smoke-exhaust pipeline 2.11 of gas turbine.
Described main steam turbine 1 also comprises vapour condenser 5, the steam-expelling port of described low pressure (LP) cylinder LP connects described vapour condenser 5,5.1 li of the hot wells of described vapour condenser 5 are provided with a water charging system 6, described vapour condenser 5 connects described low-pressure coal saver 2.9, on the pipeline between described vapour condenser 5 and described low-pressure coal saver 2.9, is provided with condensate pump 7.
Described low-pressure coal saver 2.9 connects the water intake of an oxygen-eliminating device 2.10, the water outlet of described oxygen-eliminating device 2.10 is in series with two water pumps, wherein the water outlet of the low pressure feed water pump 7.1 in upstream also connects described low-pressure steam generator 2.8, and the water outlet of the high pressure feed water pump 7.2 in downstream is all connected with described middle pressure economizer 2.6, described high-pressure economizer 2.3.
The low pressure admission pipeline of described low-pressure steam generator 2.8, described low-pressure superheater 2.7 and described low pressure (LP) cylinder LP connects successively; The high-pressure admission pipeline of described high-pressure economizer 2.3, described high pressure steam generator 2.2, described high-pressure superheater 2.1 and described high-pressure cylinder HP connects successively; In described middle pressure economizer 2.6, described medium pressure steam generator 2.5, described middle pressure superheater 2.4 and described intermediate pressure cylinder IP, compressing into steam pipe road (being heat reheating tube road) connects successively.
The steam ouput of described low-pressure steam generator 2.8 also connects described oxygen-eliminating device 2.10; The steam-expelling port of described intermediate pressure cylinder IP is connected with the steam inlet of described low pressure (LP) cylinder LP.
The steam-expelling port of described high-pressure cylinder HP connects high row's check valve 1.4, and described heat supply network steam bleeding system 4 is located at the downstream of described high row's check valve 1.4.
Described high row's check valve 1.4 of the present utility model connects the first safety valve 4.2, described the first safety valve 4.2 downstreams connect two branch roads, the first branch road (being cold reheat pipe road) connects the steam line between described medium pressure steam generator 2.5, middle pressure superheater 2.4, and described the first branch road (being cold reheat pipe road) is provided with the first modulating valve 4.1; The second branch road connects a little back pressure turbine 3, on described the second branch road, be provided with successively a shut-off valve 3.1 and the second modulating valve 3.2 by upstream to downstream, the steam-expelling port of described little back pressure turbine 3 connects the second safety valve 3.4, the downstream of described the second safety valve 3.4 connects an one-way valve 3.3, and described one-way valve 3.3 connects described heat supply network steam bleeding system 4.
Wherein, described the second modulating valve 3.2 can be served as by the speed governing steam valve on the admission pipeline of described little back pressure turbine 3, and described shut-off valve 3.1 can be served as by the main stop valve on the admission pipeline of described little back pressure turbine 3.
Described low pressure admission pipeline of the present utility model is provided with a low pressure admission valve group 1.3, and described low-pressure admission valve group 1.3 comprises a main stop valve and a modulating valve; In described, compress into steam pipe road and be provided with one and compress into steam valve group 1.2, compress into steam valve group 1.2 in described and also comprise a main stop valve and a modulating valve; Described high-pressure admission pipeline is provided with a high-pressure admission valve group 1.1, and described high-pressure admission valve group 1.1 also comprises a main stop valve and a modulating valve.
On described high-pressure admission pipeline of the present utility model, be provided with the first bypass duct that connects described cold reheat pipe road in the upstream of described high-pressure admission valve group 1.1, described the first bypass duct is provided with valve 9.1; On blow-off line between the steam-expelling port of described high-pressure cylinder HP and described high row's check valve 1.4, be also provided with the second bypass duct, described the second bypass duct is provided with valve 9.2; In described, compress on steam pipe road and be provided with the 3rd bypass duct in described upstream of compressing into steam valve group 1.2, described the 3rd bypass duct is provided with valve 9.3; On described low pressure admission pipeline, be provided with the 4th bypass duct in the upstream of described low pressure admission valve group 1.3, described the 4th bypass duct is provided with valve 9.4; Described the second bypass duct, the 3rd bypass duct and the 4th bypass duct are all connected with described vapour condenser 5; Article four, the common composition of described bypass duct one bypath system 9.
The setting of bypath system 9, make main steam turbine 1 in the time of non-matching state operation, the steam flow that exhaust heat boiler produces and the difference of main steam turbine 1 needed steam flow can not passed through the circulation part of main steam turbine, but pass through bypath system, valve on each bypass duct includes steam converter valve, thereby the steam of elevated pressures, higher temperature is reduced to required steam parameter, thereafter steam is incorporated into the connected system of described vapour condenser 5, meet the needs of whole system safe operation.Cold, warm, the thermal starting of bypath system to main steam turbine 1, prevents unit superpressure, and reclaiming working medium all has good function, and stability, Security and Economy to whole cogeneration system all play an important role.
Connecting tube between described low-pressure coal saver 2.9 and described oxygen-eliminating device 2.10 is provided with a valve, on the connecting pipeline of the steam ouput of described low-pressure steam generator 2.8 and described oxygen-eliminating device 2.10, is also provided with a valve.On described low pressure admission pipeline, be also provided with a modulating valve group 1.5 in the upstream of described low pressure admission valve group 1.3.
Described main steam turbine 1 of the present utility model can comprise one or two low pressure (LP) cylinder LP, and described main steam turbine 1 can adopt high intermediate pressure cylinder to close the structure of cylinder, low pressure (LP) cylinder double split flow; Described main steam turbine also can close cylinder by an independent high-pressure cylinder HP and a mesolow and form, high-pressure cylinder single current, and the anti-stream of mesolow cylinder or following current are arranged.The steam turbine that described main steam turbine 1 is point cylinder thrust self balancing.
As shown in Figure 1, described main steam turbine 1 of the present utility model can adopt split axle to arrange with described little back pressure turbine 3; Main steam turbine 1 drags the first generator 8 and generates electricity, and little back pressure turbine 3 drags the second generator 10 and generates electricity, and wherein the second generator 10 is small generators.As shown in Figure 2, described main steam turbine 1 of the present utility model also can adopt single shaft to arrange with described little back pressure turbine 3, between the rotor of output shaft axle of described main steam turbine 1 and the rotor of output shaft axle of described little back pressure turbine 3, be provided with a self-synchronizing clutch 11, now cancel the second generator 10, make main steam turbine 1 and little back pressure turbine 3 jointly drag the first generator 8, single shaft is arranged the advantage with compact structure.
Working principle of the present utility model is: main steam turbine 1 is three pressures, pattern of fever combination circulation steam turbine again, comprises high-pressure cylinder HP, intermediate pressure cylinder IP and low pressure (LP) cylinder LP.Exhaust heat boiler 2 is three pressures, pattern of fever again, and it has three drums: high pressure drum (comprising high-pressure superheater 2.1, high pressure steam generator 2.2, high-pressure economizer 2.3), middle pressure drum (comprising middle pressure superheater 2.4, medium pressure steam generator 2.5, middle pressure economizer 2.6), low-pressure drum (comprising low-pressure superheater 2.7, low-pressure steam generator 2.8, low-pressure coal saver 2.9).The smoke evacuation of gas turbine enters exhaust heat boiler 2 by combustion machine smoke-exhaust pipeline 2.11, for the high-pressure superheater 2.1 of exhaust heat boiler 2, high pressure steam generator 2.2, high-pressure economizer 2.3, middle pressure (hot again) superheater 2.4, medium pressure steam generator 2.5, middle pressure economizer 2.6, low-pressure superheater 2.7, low-pressure steam generator 2.8, low-pressure coal saver 2.9 provides heat, make high pressure drum, middle pressure drum and low-pressure drum produce respectively three strands of steam: high pressure steam, medium pressure steam and low pressure steam, respectively by the high-pressure admission valve group 1.1 on high-pressure admission pipeline, in compress into and compress into steam valve group 1.2 on steam pipe road, low pressure admission valve group 1.3 on low pressure admission pipeline is injected high-pressure cylinder HP, intermediate pressure cylinder IP and low pressure (LP) cylinder LP.
The steam discharge of high-pressure cylinder HP is divided into two branch roads, by the coordination control of the first modulating valve 4.1 and the second modulating valve 3.2, realizes the pressure control at high row place and the assignment of traffic of high pressure steam discharge, thereby realizes the required adjustment amount of drawing gas of heat supply network.Access little back pressure turbine 3 in the upstream of heat supply network steam bleeding system 4; back pressure of little back pressure turbine 3 can be made as the demand pressure of heat supply network user side; thus the utility model is realized one-level adjustment by two turbines and is drawn gas; and the utility model has been realized the steam parameter coupling of heat supply network user side by little back pressure turbine 3; avoided arranging multistage reducing-and-cooling plant in system; therefore of the present utility model simple in structure, energy loss is few, has avoided high-quality energy waste; (when split axle is arranged, main steam turbine 1 drags the first generator 8 and generates electricity the equal drawing generator generating of main steam turbine 1 and little back pressure turbine 3, and little back pressure turbine 3 drags the second generator 10 and generates electricity; When single shaft is arranged, main steam turbine 1 and little back pressure turbine 3 jointly drag the first generator 8 and generate electricity), thus realize cogeneration of heat and power.The power of little back pressure turbine 3 is determined by flow, is supplying under thermal condition (operating mode of drawing gas), and the introducing of little back pressure turbine 3, makes the energy realize rational gradient utilization.The introducing of little back pressure turbine 3, makes main steam turbine 1 realize standardized production, and in the time drawing gas parameter adjustment, main steam turbine 1 remains unchanged, and correspondingly revises the design of little back pressure turbine 3; The standardization of main steam turbine 1 is conducive to reduce manufacture cost, shortens delivery date, saves social resources.
Water charging system 6 is arranged on 5.1 li of the hot wells of vapour condenser 5, under the operating mode of drawing gas, cogeneration system of the present utility model is supplemented to corresponding water.Supplementary water carries out after preliminary deoxygenation 5.1 li of hot wells, enter the condensate system of vapour condenser 5, under the effect of condensate pump 7, deliver to heat exchange in the low-pressure coal saver 2.9 of exhaust heat boiler 2, then, enter in oxygen-eliminating device 2.10, utilize the low-pressure saturated steam producing in low-pressure steam generator 2.8 to carry out sufficient thermal de-aeration to water of condensation, then, respectively feedwater is sent into the low-pressure steam generator 2.8 of exhaust heat boiler 2 by low pressure feed water pump 7.1 and high pressure feed water pump 7.2, middle pressure economizer 2.6, high-pressure economizer 2.3, by low-pressure steam generator 2.8, middle pressure economizer 2.6, high-pressure economizer 2.3 heat water to approach saturated.Then, the water in middle pressure economizer 2.6 enters medium pressure steam generator 2.5, and the water in high-pressure economizer 2.3 enters high pressure steam generator 2.2, and liquid water is all converted into steam (as shown in Figure 1, dotted portion is liquid water, and solid line part is water vapour); Then, the steam being produced by high pressure steam generator 2.2 and medium pressure steam generator 2.5 enters respectively high-pressure superheater 2.1 and middle pressure superheater 2.4, in high-pressure superheater 2.1 and middle pressure superheater 2.4 heat exchange, produce superheated vapor, again respectively by the high-pressure admission valve group 1.1 on high-pressure admission pipeline, in the steam valve group 1.2 of compressing into compressed on steam pipe road enter corresponding high-pressure cylinder HP and intermediate pressure cylinder IP, main steam turbine 1 is done work, drive the first generator 8 to export electric energy; The high-pressure cylinder HP steam discharge that enters the second branch road enters little back pressure turbine 3, and little back pressure turbine 3 is done work, and also drives generator output electric energy, thereby completes the thermodynamic cycle of whole system of the present utility model.
In addition, when without heat demand, main steam turbine 1 can move under pure condensed steam formula operating mode, now, shut-off valve 3.1 cuts out, and the first modulating valve 4.1 standard-sized sheets, the utlity model has the operating mode identical with traditional condensed steam type association circulating power generation system and identical generating efficiency.The energy loss of having avoided rotating barrier in the intermediate pressure cylinder of prior art cogeneration system or seat cylinder valve to cause, therefore, generating efficiency of the present utility model has improved 0.5% left and right than the generating efficiency of prior art cogeneration system.
The utility model, from pure condensed steam formula operating mode to specified heat supply operating mode conversion process, by controlling the first modulating valve 4.1 and the second modulating valve 3.2, is realized the assignment of traffic in reduce phlegm and internal heat net steam bleeding system 4 and cold reheat pipe road.In this process, the pressure drop that high row's exhaust point (i.e. high row's check valve 1.4) is located, the pressure of the middle pressure drum of exhaust heat boiler 2 is also along with decline, now, because the cold reheated steam amount that enters exhaust heat boiler 2 reduces, the temperature of reheated steam will have the trend of rising, need carry out spray cooling adjusting by exhaust heat boiler 2, makes the quality of steam meet the requirement of steam turbine.As shown in Figure 1, because the high pressure steam generator 2.2 of the exhaust heat boiler 2 of combined cycle, high-pressure superheater 2.1 are with reheated steam generator 2.5, the heat exchange process of hot superheater 2.4 adopts the form of interlaced arrangement again, therefore the minimizing of reheated steam amount, can cause the increase of high pressure steam flow, make the high-pressure cylinder HP of steam turbine will increase exerting oneself of a part.Thereby specified for thermal condition, application the utility model, compared with traditional system, the increase of exerting oneself of steam turbine, accounts for 0.7% left and right of combined cycle gross capability, therefore steam turbine operation efficiency of the present utility model is high, economic benefits.
The steam that enters the intermediate pressure cylinder IP of steam turbine reduces, the initial steam pressure of low pressure (LP) cylinder LP also decreases, can open the low pressure admission valve group 1.3 on low pressure admission pipeline, the steam being produced by low-pressure steam generator 2.8 is through low-pressure superheater 2.7 heat exchange, produce superheated vapor, enter low pressure (LP) cylinder LP through low pressure admission valve group 1.3, ensured the demand of low pressure (LP) cylinder LP minimum safe operating pressure.Steam turbine 1 of the present utility model is because adopting the design of point cylinder thrust self balancing, and the minimizing of intermediate pressure cylinder IP and low pressure (LP) cylinder LP throttle flow can not produce too large variation to the thrust of steam turbine set, can meet system safety operation requirement, thereby realizes the one-level adjustment requirement of drawing gas.
The utility model is particularly useful for the gas-fired station engineering of Gas-steam Combined Cycle heat (cold) the Electricity Federation product with extraction steam for factories demand.
Embodiment one
In certain combustion gas thermoelectricity plant engineering, intend 1 cover H level two and drag a type unit, for heat request be: 1.2MPa, 185 DEG C, the heating load of single unit is rated for: 130t/h, is 200t/h to the maximum.
This project is applicable to adopting the cogeneration system of of the present utility model pair of turbine, combined cycle.
As shown in Figure 1, in the present embodiment, the main steam turbine 1 of the cogeneration system of two turbines, combined cycle is three pressures, pattern of fever combination circulation steam turbine again, comprise a high-pressure cylinder HP, an intermediate pressure cylinder IP and two double-current low pressure (LP) cylinder LP, main steam turbine 1 is the steam turbine of point cylinder thrust self balancing, and main steam turbine 1 adopts senior middle school's pressing cylinder, low pressure double split flow structure.Exhaust heat boiler 2 is three pressures, pattern of fever again, it has three drums: high pressure drum (comprises high-pressure superheater 2.1, high pressure steam generator 2.2, high-pressure economizer 2.3), middle pressure drum (comprises middle pressure superheater 2.4, medium pressure steam generator 2.5, middle pressure economizer 2.6), low-pressure drum (comprises low-pressure superheater 2.7, low-pressure steam generator 2.8, low-pressure coal saver 2.9), produce three strands of steam: high pressure steam, medium pressure steam and low pressure steam, respectively by the high-pressure admission valve group 1.1 on high-pressure admission pipeline, in compress into and compress into steam valve group 1.2 on steam pipe road, low pressure admission valve group 1.3 on low pressure admission pipeline is injected high-pressure cylinder HP, intermediate pressure cylinder IP and low pressure (LP) cylinder LP.
The steam discharge of high-pressure cylinder HP is divided into two branch roads, the first branch road is cold reheat pipe road, the second branch road is on the admission pipeline of little back pressure turbine 3; on the admission pipeline of little back pressure turbine 3, be provided with successively main stop valve (being shut-off valve 3.1) and speed governing steam valve (i.e. the second modulating valve 3.2) by upstream to downstream; the steam-expelling port of little back pressure turbine 3 connects the second safety valve 3.4; the second safety valve 3.4 downstreams connect one-way valve 3.3, and one-way valve 3.3 connects described heat supply network steam bleeding system 4.
In the present embodiment, under declared working condition, water charging system 6 need to supplement to the cogeneration system of of the present utility model pair of turbine, combined cycle the water of 130t/h.Supplementary water carries out after preliminary deoxygenation 5.1 li of hot wells, enter the condensate system of vapour condenser 5, by pressurizeing to condensate pump 7, deliver to heat exchange in the low-pressure coal saver 2.9 of exhaust heat boiler 2, then, enter in oxygen-eliminating device 2.10, utilize the low-pressure saturated steam producing in low-pressure steam generator 2.8 to carry out sufficient thermal de-aeration to water of condensation, then, by low pressure feed water pump 7.1 and high pressure feed water pump 7.2, feedwater is sent into middle pressure economizer 2.6 and the high-pressure economizer 2.3 in exhaust heat boiler 2 again, heat water to and approach saturation water by middle pressure economizer 2.6 and high-pressure economizer 2.3, enter respectively again the high pressure steam generator 2.2 of exhaust heat boiler 2, in medium pressure steam generator 2.5, liquid water is all converted into steam, then, the steam being produced by high pressure steam generator 2.2 and medium pressure steam generator 2.5 enters respectively high-pressure superheater 2.1 and middle pressure superheater 2.4, in high-pressure superheater 2.1 and middle pressure superheater 2.4 heat exchange, produce superheated vapor, again respectively by the high-pressure admission valve group 1.1 on high-pressure admission pipeline, in the steam valve group 1.2 of compressing into compressed on steam pipe road enter corresponding high-pressure cylinder HP and intermediate pressure cylinder IP, main steam turbine 1 is done work, drive generator 8 to export electric energy.The steam discharge of the high-pressure cylinder HP of main steam turbine 1 enters little back pressure turbine 3 through the admission pipeline of little back pressure turbine 3, makes little back pressure turbine 3, drives corresponding generator output electric energy.The steam discharge of little back pressure turbine 3 passes into heat supply network steam bleeding system 4, carries out heat supply network heat supply.Thereby realize cogeneration of heat and power by two turbines.
The back pressure of the little back pressure turbine 3 of the present embodiment is made as 1.2MPa; the exhaust temperature of little back pressure turbine 3 is about 190 DEG C; apparent; the present embodiment has been realized one-level adjustment by two turbines and drawn gas; the steam discharge parameter of the little back pressure turbine 3 of the present embodiment and the parameter matching for heat request obtain very perfect, thereby have avoided high-quality energy waste phenomenon.In addition, when without heat demand, main steam turbine 1 can move under pure condensed steam formula operating mode, now, close shut-off valve 3.1, by the first modulating valve 4.1 standard-sized sheets, the cogeneration system of two turbines of the present embodiment, combined cycle has the operating mode identical with traditional condensed steam type association circulating power generation system and identical generating efficiency.The energy loss of having avoided rotating barrier in the intermediate pressure cylinder of prior art cogeneration system or seat cylinder valve to cause, generating efficiency has improved 0.5% left and right than the generating efficiency of prior art cogeneration system.
In the time that the cogeneration system of two turbines, combined cycle need to provide the heating load of maximum 200t/h, make the water of the supplementary 200t/h of cogeneration system of two turbines, combined cycle that water charging system 6 adopts the present embodiment.
Little back pressure turbine 3 and the main steam turbine 1 of the present embodiment both can adopt the split axle shown in Fig. 1 to arrange; Also can adopt the single shaft shown in Fig. 2 to arrange.
In sum, the cogeneration system of the of the present utility model pair of turbine, combined cycle has solved a difficult problem for the on the low side and high-quality energy dissipation of traditional co-generation unit steam turbine unit internal efficiency.When without heat demand, main steam turbine 1 moves under pure condensed steam formula operating mode, main steam turbine 1 has the operating mode identical with traditional condensed steam type association circulating power generation system and identical generating efficiency, compared with the restriction loss causing at the rotating barrier without in the inner through-flow middle intermediate pressure cylinder of thermal condition tubine or seat cylinder valve with traditional cogeneration, combined cycle system still exists, generating efficiency of the present utility model has improved 0.5% left and right.In the time having heat demand, realizing one-level adjustment by little back pressure turbine 3 draws gas, not only eliminate pressure reduction, and significantly reduce the temperature difference, thereby avoid high-quality energy waste, and little back pressure turbine 3 can be exported additional electrical energy by drawing generator, makes the energy realize rational ladder utilization.The utility model, having outside above energy-efficient advantage, also helps the standardized production that realizes main steam turbine group, and the adjustment of the parameter of drawing gas does not directly affect the Design and manufacture of main steam turbine, only affects design and the manufacture of little back pressure turbine; The standardization of main steam turbine is conducive to reduce manufacture cost, reduces delivery date, saves social resources.So the utility model has effectively overcome various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present utility model and effect thereof only, but not for limiting the utility model.Any person skilled in the art scholar all can, under spirit of the present utility model and category, modify or change above-described embodiment.Therefore, have in technical field under such as and conventionally know that the knowledgeable modifies or changes not departing from all equivalences that complete under spirit that the utility model discloses and technological thought, must be contained by claim of the present utility model.
Claims (9)
1. a cogeneration system for two turbines, combined cycle, comprises gas turbine, main steam turbine (1), exhaust heat boiler (2), heat supply network steam bleeding system (4); The smoke-exhaust pipeline (2.11) of gas turbine connects described exhaust heat boiler (2), and described exhaust heat boiler (2) comprises high pressure drum, middle pressure drum and low-pressure drum; Described main steam turbine (1) comprises high-pressure cylinder (HP), intermediate pressure cylinder (IP) and low pressure (LP) cylinder (LP); Described high pressure drum connects the high-pressure admission pipeline of described high-pressure cylinder (HP), described middle pressure drum connect described intermediate pressure cylinder (IP) in compress into steam pipe road, described low-pressure drum connects the low pressure admission pipeline of described low pressure (LP) cylinder (LP); The steam-expelling port of described high-pressure cylinder (HP) connects high row's check valve (1.4), and described heat supply network steam bleeding system (4) is located at the downstream of described high row's check valve (1.4); It is characterized in that,
Described high row's check valve (1.4) connects the first safety valve (4.2), and described the first safety valve (4.2) downstream connects two branch roads, and the first branch road connects the steam line of described middle pressure drum, and described the first branch road is provided with the first modulating valve (4.1); The second branch road connects a little back pressure turbine (3), on described the second branch road, be provided with successively a shut-off valve (3.1) and the second modulating valve (3.2) by upstream to downstream, the steam-expelling port of described little back pressure turbine (3) connects the second safety valve (3.4), described the second safety valve (3.4) downstream connects an one-way valve (3.3), and described one-way valve (3.3) connects described heat supply network steam bleeding system (4).
2. the cogeneration system of the according to claim 1 pair of turbine, combined cycle, is characterized in that: described main steam turbine (1) adopts split axle to arrange with described little back pressure turbine (3).
3. the cogeneration system of the according to claim 1 pair of turbine, combined cycle, it is characterized in that: described main steam turbine (1) adopts single shaft to arrange with described little back pressure turbine (3), between the rotor of output shaft axle of described main steam turbine (1) and the rotor of output shaft axle of described little back pressure turbine (3), is provided with a self-synchronizing clutch (11).
4. according to arbitrary described two turbines, the cogeneration system of combined cycle in claims 1 to 3, it is characterized in that: the speed governing steam valve on the admission pipeline that described the second modulating valve (3.2) is described little back pressure turbine (3), described shut-off valve (3.1) is the main stop valve of described little back pressure turbine (3).
5. according to arbitrary described two turbines, the cogeneration system of combined cycle in claims 1 to 3, it is characterized in that: described main steam turbine (1) comprises one or two low pressure (LP) cylinder (LP), described main steam turbine (1) closes the structure of cylinder, low pressure (LP) cylinder double split flow for high intermediate pressure cylinder.
6. according to arbitrary described two turbines, the cogeneration system of combined cycle in claims 1 to 3, it is characterized in that: described main steam turbine (1) comprises that a high-pressure cylinder (HP) and a mesolow close cylinder, and described main steam turbine (1) divides separately cylinder, mesolow cylinder cylinder combined structure for high-pressure cylinder.
7. according to arbitrary described two turbines, the cogeneration system of combined cycle in claims 1 to 3, it is characterized in that: described low pressure admission pipeline is provided with a low pressure admission valve group (1.3), in described, compress into steam pipe road and be provided with one and compress into steam valve group (1.2), described high-pressure admission pipeline is provided with a high-pressure admission valve group (1.1).
8. according to arbitrary described two turbines, the cogeneration system of combined cycle in claim 7, it is characterized in that: on described high-pressure admission pipeline, be provided with a bypass duct that connects described the first branch road in the upstream of described high-pressure admission valve group (1.1); On blow-off line between the steam-expelling port of described high-pressure cylinder (HP) and described high row's check valve (1.4), be also provided with a bypass duct, in described, compress on steam pipe road and be also provided with a bypass duct in described upstream of compressing into steam valve group (1.2), on described low pressure admission pipeline, be also provided with a bypass duct in the upstream of described low pressure admission valve group (1.3), the bypass duct of compressing on steam pipe road and on described low pressure admission pipeline on the blow-off line of described high-pressure cylinder, in described is all connected with the vapour condenser (5) of described main steam turbine (1); Article four, described bypass duct common composition one bypath system (9), is respectively equipped with a valve on four described bypass ducts.
9. according to arbitrary described two turbines, the cogeneration system of combined cycle in claims 1 to 3, it is characterized in that: on described low pressure admission pipeline, be provided with a modulating valve group (1.5) in the upstream of described low pressure admission valve group (1.3).
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| CN201320853500.0U CN203685319U (en) | 2013-12-20 | 2013-12-20 | Double-turbine combined-cycle combined heat and power supplying system |
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| CN103644004A (en) * | 2013-12-20 | 2014-03-19 | 上海电气电站设备有限公司 | Double-turbine and combined cycle heat and power combined supply system |
| CN104654268A (en) * | 2015-02-15 | 2015-05-27 | 华北电力科学研究院有限责任公司 | Gas thermal power plant two-driving-one unit auxiliary steam system and on-off control method thereof |
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| CN104696939A (en) * | 2015-02-15 | 2015-06-10 | 华北电力科学研究院有限责任公司 | Medium-pressure steam system for two-pull-one unit of fuel gas thermal power plant and start-stop control method of medium-pressure steam system |
| CN104948244A (en) * | 2015-06-29 | 2015-09-30 | 华北电力大学（保定） | Supercritical thermal power generation system constructed through subcritical thermal power generation system |
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| CN103644004A (en) * | 2013-12-20 | 2014-03-19 | 上海电气电站设备有限公司 | Double-turbine and combined cycle heat and power combined supply system |
| CN103644004B (en) * | 2013-12-20 | 2015-09-16 | 上海电气电站设备有限公司 | The cogeneration system of a kind of pair of turbine, combined cycle |
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| CN104696939A (en) * | 2015-02-15 | 2015-06-10 | 华北电力科学研究院有限责任公司 | Medium-pressure steam system for two-pull-one unit of fuel gas thermal power plant and start-stop control method of medium-pressure steam system |
| CN104654268B (en) * | 2015-02-15 | 2016-06-29 | 华北电力科学研究院有限责任公司 | Gas power station two drags a unit Auxiliary Steam and on off control method thereof |
| CN105240815A (en) * | 2015-03-11 | 2016-01-13 | 罗学大 | Waste gas heat recovery steam conversion device and gas generator set |
| CN104948244A (en) * | 2015-06-29 | 2015-09-30 | 华北电力大学（保定） | Supercritical thermal power generation system constructed through subcritical thermal power generation system |
| CN105605598A (en) * | 2016-03-10 | 2016-05-25 | 王欣 | Power station boiler smoke waste heat system capable of improving unit performance |
| CN105757760A (en) * | 2016-04-29 | 2016-07-13 | 大唐东北电力试验研究所有限公司 | Heat supply network circulating water system applied in various combined driving modes |
| CN105783082A (en) * | 2016-04-29 | 2016-07-20 | 大唐东北电力试验研究所有限公司 | Energy-saving heating network circulating water system |
| CN109236397A (en) * | 2018-10-24 | 2019-01-18 | 珠海格力电器股份有限公司 | Co-generation unit |
| CN109236397B (en) * | 2018-10-24 | 2024-03-08 | 珠海格力电器股份有限公司 | Cogeneration system |
| CN110159372A (en) * | 2019-06-26 | 2019-08-23 | 西安西热节能技术有限公司 | A kind of system and method for realizing vapour pneumoelectric trilogy supply |
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