CN203499735U - Combined cycle co-generation system - Google Patents
Combined cycle co-generation system Download PDFInfo
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- CN203499735U CN203499735U CN201320551856.9U CN201320551856U CN203499735U CN 203499735 U CN203499735 U CN 203499735U CN 201320551856 U CN201320551856 U CN 201320551856U CN 203499735 U CN203499735 U CN 203499735U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model provides a combined cycle co-generation system, which comprises a steam turbine, a residual heat boiler and a heat supply network extraction steam system, wherein the steam turbine comprises a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder; the residual heat boiler comprises a high-pressure steam dome, a medium-pressure steam dome and a low-pressure steam dome; three strands of steam, namely, high-pressure steam, medium-pressure steam and low-pressure steam are produced by the three steam domes respectively, are injected into the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder of the steam turbine respectively, and expand to drive an electric generator to output electric energy. In the combined cycle co-generation system, a steam exhaust pipeline of the high-pressure cylinder is provided with a high-exhaust check valve; the heat supply network extraction steam system designed for supplying heat is arranged downstream the high-exhaust check valve; the heat supply network extraction steam system comprises two parallel regulating valves; a first regulating valve is connected with a first-stage temperature and pressure reduction for realizing one-stage regulation and steam extraction of the steam turbine; a second regulating valve is connected with a pipeline between a medium-pressure steam generator and a medium-pressure overheater through a cold reheating pipeline. Compared with the conventional combined cycle co-generation system, the combined cycle co-generation system provided by the utility model has the advantages of high running efficiency, high power generation efficiency, high quality and little waste of energy.
Description
Technical field
The utility model relates to Gas-steam Combined Cycle, the cogeneration technical field of steam turbine, particularly relates to a kind of cogeneration system of 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 being produced by boiler, high pressure steam, 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%.
At present conventional gas-steam combined cycle system has that two that E level circulating power station extensively adopts press, without re-heating subsystem and F level circulating power station, adopt three presses, 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.
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, in suitable position, the through-flow inside of steam turbine, extract a part of steam out for factory steam, 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 main flow F level Gas-steam Combined Cycle, the cogeneration technology of existing market of take is example, and prior art also comes with some shortcomings.(configuration of one-to-one type refers to the exhaust heat energy with a combustion machine of an exhaust heat boiler recovery to suppose certain engineering thermoelectricity plant will to go up the F level gas Combined turbine cycle group of the one-to-one type configuration of two covers, and the initial steam producing is injected to a steam turbine): steam demand is 1.8MPa, 285 ℃; Steam flow is specified 130t/h, is 210t/h to the maximum, extreme maximum 250t/h; And typical F level three is pressed, the parameter of the heat integration circulatory system again arranges as follows:
High pressure steam parameter is 13MPa, 560 ℃;
Heat (pressing) steam parameter is 3.0MPa again, 550 ℃;
Low pressure steam parameter is 0.3MPa, 240 ℃;
The design of the combined cycle of prior art, cogeneration system is rotating barrier or a seat cylinder valve to be set at place, Steam Turbine Through IP Admission through-flow 1.8MPa left and right realize adjusting and draw gas, the temperature of this place's steam is 460 ℃ of left and right, and user's temperature requirements is only 285 ℃, exist the temperature difference waste of 175 ℃, thereby the phenomenon that has inevitably occurred high-quality energy waste, meanwhile, arranging of regulating mechanism destroyed the through-flow structure of middle pressure, causes overall efficiency to decline.
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 the cogeneration system of the combined cycle that high, the high-quality energy waste of a kind of steam-turbine unit operational efficiency is few, to overcome the above-mentioned defect of prior art.
In order to solve the problems of the technologies described above, the utility model provides a kind of cogeneration system of combined cycle, comprises a steam turbine, an exhaust heat boiler, a heat network system; Described steam turbine comprises a high-pressure cylinder, an intermediate pressure cylinder and a low pressure (LP) cylinder; Described exhaust heat boiler comprises high-pressure superheater, high pressure steam generator, high-pressure economizer, middle pressure (hot again) superheater, middle pressure (hot again) steam generator, middle pressure (hot again) economizer, low-pressure superheater, low-pressure steam generator, low-pressure coal saver;
The steam-expelling port of described low pressure (LP) cylinder is connected with a vapour condenser, is provided with a water charging system in the hot well of described vapour condenser, and described vapour condenser connects described low-pressure coal saver, on the pipeline between described vapour condenser and described low-pressure coal saver, is provided with a condensate pump;
Described low-pressure coal saver connects the water intake of an oxygen-eliminating device, the water outlet of described oxygen-eliminating device is in series with two water pumps, wherein the water outlet of the low pressure feed water pump in upstream also connects low-pressure steam generator, and the water outlet of the high pressure feed water pump in downstream is all connected with described middle pressure economizer, described high-pressure economizer;
The low pressure admission pipeline of described low-pressure steam generator, low-pressure superheater and described low pressure (LP) cylinder connects successively; The high-pressure admission pipeline of described high-pressure economizer, high pressure steam generator, high-pressure superheater and described high-pressure cylinder connects successively; In described middle pressure economizer, medium pressure steam generator, middle pressure superheater and described intermediate pressure cylinder, compressing into steam pipe road connects successively;
The steam ouput of described low-pressure steam generator also connects described oxygen-eliminating device;
The steam-expelling port of described intermediate pressure cylinder is connected with the steam inlet of described low pressure (LP) cylinder;
The blow-off line of described high-pressure cylinder is provided with high row's check valve, described heat supply network steam bleeding system is located at the downstream of described high row's check valve, described heat supply network steam bleeding system comprises the modulating valve of two parallel connections, wherein said the first modulating valve connects for realizing the first order reducing-and-cooling plant that the adjustment of steam turbine one-level is drawn gas, described the second modulating valve connects a cold reheat pipe road, and described cold reheat pipe road is connected with the steam line between described medium pressure steam generator and described middle pressure superheater.
Preferably, the downstream tandem of described first order reducing-and-cooling plant has second level reducing-and-cooling plant or more multistage reducing-and-cooling plant, is all connected with a modulating valve between the reducing-and-cooling plant of every adjacent two-stage.
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, compress in described and on steam pipe road, in described upstream of compressing into steam valve group, be provided with the heat supply network branch road that draws gas, described heat supply network route upstream a to downstream of drawing gas is provided with a modulating valve and a reducing-and-cooling plant successively.
Preferably, on described high-pressure admission pipeline, in the upstream of described high-pressure admission valve group, be provided with a bypass duct that connects described cold reheat pipe road; 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, in the upstream of described low pressure admission valve group, be also provided with a bypass duct, 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 described vapour condenser; Article four, described bypass duct forms a bypath system jointly.
Preferably, on four described bypass ducts, be respectively equipped with a valve.
Preferably, described steam turbine is the structure that high-pressure cylinder divides separately cylinder, mesolow cylinder to close cylinder, or high intermediate pressure cylinder closes the structure that cylinder, low pressure (LP) cylinder divide separately cylinder.
Preferably, the connecting tube between described low-pressure coal saver and described oxygen-eliminating device is provided with a valve.
Preferably, the steam ouput of described low-pressure steam generator and the connecting pipeline of described oxygen-eliminating device are provided with a valve.
Preferably, on described low pressure admission pipeline, in the upstream of described low pressure admission valve group, be provided with a modulating valve group.
As mentioned above, the cogeneration system of combined cycle of the present utility model, has following beneficial effect:
When without heat demand, the first modulating valve of described heat supply network steam bleeding system is in closed condition, described the second modulating valve is in full-gear, steam turbine moves under pure condensed steam formula operating mode, the utlity model has the operating mode identical with traditional condensed steam type association circulating power generation system and identical generating efficiency, the restriction loss causing at the rotating barrier without in the inner through-flow middle intermediate pressure cylinder for thermal condition tubine or seat cylinder valve with traditional cogeneration, combined cycle system still exists and compares, and generating efficiency of the present utility model has improved 0.4%～0.5%.When having heat demand, by two modulating valve of heat supply network steam bleeding system, realize the required adjustment amount of drawing gas of heat supply network, the vapor (steam) temperature of high pressure steam discharge will realize the temperature of adjusting the place's steam that draws gas much smaller than prior art Steam Turbine Through IP Admission, therefore, the utility model is more much smaller than the temperature difference waste of prior art, thereby high-quality energy waste phenomenon is significantly improved.In addition, without rotating barrier or built-in type steam pumping regulating valve are set, the through-flow internal efficiency of steam turbine is apparently higher than the internal efficiency of the extraction turbine being equipped with under traditional mode in steam turbine of the present utility model is through-flow.
Accompanying drawing explanation
Fig. 1 is shown as the structural representation of the cogeneration system of combined cycle of the present utility model.
Element numbers explanation
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.Notice, appended graphic the illustrated structure of this specification, ratio, size etc., equal contents in order to coordinate specification to disclose only, for person skilled in the art scholar, understand and read, not in order to limit the enforceable qualifications of the utility model, therefore the technical essential meaning of tool not, the adjustment of the modification of any structure, the change of proportionate relationship or size, do not affecting under the 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, under without essence change technology contents, when being also considered as the enforceable category of the utility model.
As shown in Figure 1, the utility model provides a kind of cogeneration system of combined cycle, comprises steam turbine 1, exhaust heat boiler 2, heat supply network steam bleeding system 3.
Described steam turbine 1 comprises a high-pressure cylinder HP, an intermediate pressure cylinder IP and a low pressure (LP) cylinder LP; Described exhaust heat boiler 2 comprises high-pressure superheater 2.1, high pressure steam generator 2.2, high-pressure economizer 2.3, middle pressure (hot again) superheater 2.4, middle pressure (hot again) steam generator 2.5, middle pressure (hot again) economizer 2.6, low-pressure superheater 2.7, low-pressure steam generator 2.8, low-pressure coal saver 2.9.
The steam-expelling port of described low pressure (LP) cylinder LP is connected with a 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, is provided with a condensate pump 7 on the pipeline between described vapour condenser 5 and described low-pressure coal saver 2.9.
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 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, 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, high pressure steam generator 2.2, high-pressure superheater 2.1 and described high-pressure cylinder HP connects successively; In described middle pressure economizer 2.6, medium pressure steam generator 2.5, 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 blow-off line of described high-pressure cylinder HP of the present utility model is provided with high row's check valve 1.4, described heat supply network steam bleeding system 3 is located at the downstream of described high row's check valve 1.4, described heat supply network steam bleeding system 3 comprises two modulating valve in parallel, wherein the first modulating valve 3.1 connects for realizing the first order reducing-and-cooling plant 3.3 that the adjustment of steam turbine one-level is drawn gas, the second modulating valve 3.2 connects a cold reheat pipe road, and described cold reheat pipe road is connected with the steam line between described medium pressure steam generator 2.5 and described middle pressure superheater 2.4.
According to the needs of actual heat supply, the downstream of described first order reducing-and-cooling plant 3.3 can also connect second level reducing-and-cooling plant 3.6 or more multistage reducing-and-cooling plant, be all connected with a modulating valve 3.7 between the reducing-and-cooling plant of every adjacent two-stage.
Described low pressure admission pipeline 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, in the upstream of described high-pressure admission valve group 1.1, be provided with a bypass duct that connects described cold reheat pipe road; 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, in the upstream of described low pressure admission valve group 1.3, be also provided with a bypass duct, 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 HP, in described is all connected with described vapour condenser 5; Article four, described bypass duct forms a bypath system 4 jointly.
Wherein, connecting tube between described low-pressure coal saver 2.9 and described oxygen-eliminating device 2.10 is provided with a valve, article four, on described bypass duct, be also equipped 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, be also provided with a valve.On described low pressure admission pipeline, in the upstream of described low pressure admission valve group 1.3, be also provided with a modulating valve group 1.5.
The structure that steam turbine 1 described in the utility model can divide separately cylinder, intermediate pressure cylinder IP and low pressure (LP) cylinder LP to close cylinder for high-pressure cylinder HP, also can close the structure that cylinder, low pressure (LP) cylinder LP divide separately cylinder for high-pressure cylinder HP and intermediate pressure cylinder IP.
Working principle of the present utility model is: steam turbine 1 is three pressures, pattern of fever combination circulation steam turbine again, comprises a high-pressure cylinder HP, an intermediate pressure cylinder IP and a low pressure (LP) cylinder LP, and this steam turbine is the steam turbine of minute cylinder thrust self balancing.Exhaust heat boiler 2 is three pressures, pattern of fever again, and it has three drums: high pressure drum (being the system that high-pressure superheater 2.1, high pressure steam generator 2.2, high-pressure economizer 2.3 form), middle pressure drum (system of pressing superheater 2.4, medium pressure steam generator 2.5, middle pressure economizer 2.6 to form), low-pressure drum (being the system of low-pressure superheater 2.7, low-pressure steam generator 2.8, low-pressure coal saver 2.9 compositions).The smoke evacuation of combustion machine enters exhaust heat boiler 2 by combustion machine smoke-exhaust pipeline 2.11, high-pressure superheater 2.1 for 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.
Heat supply network steam bleeding system 3 is located at the downstream of the height row check valve 1.4 on the blow-off line of high-pressure cylinder HP, by the first modulating valve 3.1 and the second modulating valve 3.2, realize the pressure control at high row place and the assignment of traffic of high pressure steam discharge, thereby realize the required adjustment amount of drawing gas of heat supply network.Downstream line place at the first modulating valve 3.1 arranges first order reducing-and-cooling plant 3.3, by first order reducing-and-cooling plant 3.3, makes steam parameter from height row steam parameter, change the parameter of drawing gas of power plant's demand into.Certainly, according to real work needs, if first order reducing-and-cooling plant 3.3 cannot meet the parameter of drawing gas of power plant's demand in design, reducing-and-cooling plant even more multistage reducing-and-cooling plant in the second level can also be set in the downstream of first order reducing-and-cooling plant 3.3, until can meet the parameter of drawing gas of power plant's demand.
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, the cogeneration system of a kind of combined cycle 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, by low pressure feed water pump 7.1 and high pressure feed water pump 7.2, respectively feedwater is sent into the low-pressure steam generator 2.8 of exhaust heat boiler 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 is partly water vapour); Then, the steam being produced by high pressure steam generator 2.2 and medium pressure steam generator 2.5 enter respectively high-pressure superheater 2.1 and in 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, make steam turbine 1 acting, drive generator 8 output electric energy, complete the thermodynamic cycle of whole system of the present utility model.Traditional heat supply method is, rotating barrier or a seat cylinder valve is set in the intermediate pressure cylinder IP inside of steam turbine 1 and realizes adjusting and draw gas, and the temperature of this place's steam is often far above user's demand temperature, thereby inevitably occurs 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, setting because 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.
Heat supply network steam bleeding system 3 of the present utility model is located at the exhauster system of described high-pressure cylinder HP, because of the temperature of high pressure steam discharge place steam low more many than the temperature of intermediate pressure cylinder IP internal rotating dividing plate or seat cylinder valve place steam, demand temperature higher than user is few, and therefore, much less is wanted in high-quality energy waste.In addition, when without heat demand, steam turbine set can be moved under pure condensed steam formula operating mode, now, the first modulating valve 3.1 of heat supply network steam bleeding system cuts out, the second modulating valve 3.2 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 0.4%～0.5% 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 3.1 and the second modulating valve 3.2, is realized the assignment of traffic in heat supply network steam bleeding system 3 and cold reheat pipe road.Now, the pressure drop that high row's exhaust point (i.e. high row's check valve 4.1) is located, the pressure of the middle pressure drum of exhaust heat boiler 2 is also along with decline, simultaneously, the cold reheated steam amount that makes to enter the cold reheat pipe road of exhaust heat boiler 2 reduces, the parameter 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 for thermal condition, application the utility model, compares with traditional system specified, increases of exerting oneself of steam turbine, account for 0.7% left and right of combined cycle gross capability, so 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, through low pressure admission valve group 1.3, enter low pressure (LP) cylinder LP, guaranteed the demand of low pressure (LP) cylinder LP minimum safe operating pressure.Steam turbine 1 of the present utility model is because adopting a minute cylinder thrust self balancing design, 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 realize the requirement of one-level adjustable steam extraction.
If the cogeneration system of a kind of combined cycle of the present utility model of two covers will be gone up by certain engineering thermoelectricity plant, when wherein a set of when breaking down or overhauling, heating load when making heat supply still can meet two covers, in described, compress into the upper heat supply network of can also establishing in the upstream of described main stop valve 1.2 in steam pipe road (being heat reheating tube road) and draw gas branch road towards heat supply network, draw gas route upstream a to downstream of described heat supply network is provided with a modulating valve 3.4 and a reducing-and-cooling plant 3.5 successively, described heat supply network draws gas branch road as a set of standby when breaking down or overhauling wherein, modulating valve 3.4 cuts out at ordinary times, when another set of when breaking down or overhauling, first in regulating by the second modulating valve 3.2, press the pressure of drum, make it reach the pressure that is not less than heat supply network demand, and then the modulating valve 3.4 of opening, by reducing-and-cooling plant 3.5 by the part reheat heat steam injection in reheat heat pipeline to heat supply network.
The standby heat supply network process that branch road comes into operation of drawing gas is that the cogeneration system of combined cycle of the present utility model is converted into the draw gas process of operating mode (maximum of heat supply network steam bleeding system 3 draw gas operating mode+heat supply network draw gas the operating mode of drawing gas of branch road) of extreme maximum from the maximum operating mode (maximum that specifically refers to heat supply network steam bleeding system 3 draw gas operating mode) of drawing gas.This extreme maximum operating mode of drawing gas is that standby short-term is maximum for thermal condition, during only for other a set of system overhaul or fault.
The utility model is particularly useful for having the gas-fired station engineering of Gas-steam Combined Cycle thermoelectricity (cold) coproduction of extraction steam for factories demand.
Embodiment one
In certain combustion gas thermoelectricity plant engineering, need two cover F level one-to-one type units, for heat request, be: 1.8MPa, 285 ℃, the heating load of single unit is rated for: 130t/h, is 210t/h to the maximum.During another set of fault, the maximum of this unit is 250t/h for heat request.Wherein:
High pressure steam parameter is 13MPa, 560 ℃;
Heat (pressing) steam parameter is 3.0MPa again, 550 ℃;
Low pressure steam parameter is 0.3MPa, 240 ℃;
High row's steam parameter is 2.5MPa, 335 ℃.
As shown in Figure 1, adopt the cogeneration system of two covers combined cycle of the present utility model.
Steam turbine 1 is three pressures, pattern of fever combination circulation steam turbine again, comprise a high-pressure cylinder HP, an intermediate pressure cylinder IP and a low pressure (LP) cylinder LP, this steam turbine is the steam turbine of minute cylinder thrust self balancing, both can be the structure that high-pressure cylinder HP divides separately cylinder, intermediate pressure cylinder IP and low pressure (LP) cylinder LP to close cylinder, and also can make high-pressure cylinder HP and intermediate pressure cylinder IP close the structure that cylinder, low pressure (LP) cylinder LP divide separately cylinder.Exhaust heat boiler 2 is three pressures, pattern of fever again, it has three drums: high pressure drum (is high-pressure superheater 2.1, high pressure steam generator 2.2, the system that high-pressure economizer 2.3 forms), middle pressure drum (is pressed superheater 2.4, medium pressure steam generator 2.5, the system that middle pressure economizer 2.6 forms), low-pressure drum (is low-pressure superheater 2.7, low-pressure steam generator 2.8, the system that low-pressure coal saver 2.9 forms), 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.
Heat supply network steam bleeding system 3 is located at the downstream of the height row check valve 1.4 on the blow-off line of high-pressure cylinder HP, by the first modulating valve 3.1 and the second modulating valve 3.2, realize the pressure control at high row place and the assignment of traffic of high pressure steam discharge, thereby realize the required adjustment amount of drawing gas of heat supply network.Downstream line place at the first modulating valve 3.1 arranges first order reducing-and-cooling plant 3.3, by first order reducing-and-cooling plant 3.3, make steam parameter arrange steam parameter (2.5MPa from height, 335 ℃) change the parameter of drawing gas of power plant's demand into: 1.8MPa, 285 ℃.In described, compress into and on steam pipe road, in the upstream of described main stop valve 1.2, be provided with towards a heat supply network of the heat supply network branch road that draws gas, draw gas route upstream a to downstream of described heat supply network is provided with a modulating valve 3.4 and a reducing-and-cooling plant 3.5 successively, this heat supply network draws gas branch road as standby, when other a set of combined cycle, cogeneration system breaks down or while overhauling, can provide the reheat heat steam of 40t/h to fill into heat supply network, realize the extreme heat supply working condition requirement of 250t/h.
High row's steam of the present utility model is 335 ℃-285 ℃=50 ℃ with supplying the difference of the temperature of heat request, referring to background technique part, traditional intermediate pressure cylinder IP inside at steam turbine 1 arranges rotating barrier or seat cylinder valve and realizes that adjusting draws gas exists the temperature difference waste of 175 ℃, thereby the utility model is more much smaller than the temperature difference waste of prior art, and high-quality energy waste phenomenon is significantly improved.In addition, when without heat demand, steam turbine set can be moved under pure condensed steam formula operating mode, now, the first modulating valve 3.1 of heat supply network steam bleeding system and the second modulating valve 3.2 are closed, 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 0.4%～0.5% than the generating efficiency of prior art cogeneration system.
In the present embodiment, under declared working condition, water charging system 6 need to supplement to the cogeneration system of combined cycle of the present utility model 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 giving condensate pump 7 pressurizations, 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, by in pressure economizer 2.6 and high-pressure economizer 2.3 heat water to and approach saturation water, 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 enter respectively high-pressure superheater 2.1 and in 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, make steam turbine 1 acting, drive generator 8 output electric energy.Completed the thermodynamic cycle of whole system.
In sum, the cogeneration system of combined cycle of the present utility model is when without heat demand, the first modulating valve of described heat supply network steam bleeding system is in closed condition, the second modulating valve is in full-gear, steam turbine moves under pure condensed steam formula operating mode, the utlity model has the operating mode identical with traditional condensed steam type association circulating power generation system and identical generating efficiency, with traditional cogeneration, the restriction loss that combined cycle system causes at the rotating barrier without in the inner through-flow middle intermediate pressure cylinder for thermal condition tubine or seat cylinder valve still exists and compares, generating efficiency of the present utility model has improved 0.4%～0.5%.When having heat demand, by two modulating valve of heat supply network steam bleeding system, realize the required adjustment amount of drawing gas of heat supply network, the vapor (steam) temperature of high pressure steam discharge will realize the temperature of adjusting the place's steam that draws gas much smaller than prior art Steam Turbine Through IP Admission, therefore, the utility model is more much smaller than the temperature difference waste of prior art, thereby the high-quality energy waste phenomenon of prior art is significantly improved.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 (10)
1. a cogeneration system for combined cycle, is characterized in that, comprises a steam turbine (1), an exhaust heat boiler (2), a heat supply network steam bleeding system (3);
Described steam turbine (1) comprises a high-pressure cylinder (HP), an intermediate pressure cylinder (IP) and a low pressure (LP) cylinder (LP); Described exhaust heat boiler (2) comprises high-pressure superheater (2.1), high pressure steam generator (2.2), high-pressure economizer (2.3), middle pressure 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);
The steam-expelling port of described low pressure (LP) cylinder (LP) is connected with a vapour condenser (5), the inner water charging system (6) that is provided with of hot well (5.1) of described vapour condenser (5), 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 a 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 low pressure feed water pump (7.1) and high pressure feed water pump (7.2), the water outlet of described low pressure feed water pump (7.1) also connects described low-pressure steam generator (2.8), and the water outlet of described high pressure feed water pump (7.2) 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 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 blow-off line of described high-pressure cylinder (HP) is provided with high row's check valve (1.4), described heat supply network steam bleeding system (3) is located at the downstream of described high row's check valve (1.4), described heat supply network steam bleeding system (3) comprises the first modulating valve (3.1) and the second modulating valve (3.2) in parallel, described the first modulating valve (3.1) connects for realizing the first order reducing-and-cooling plant (3.3) that the adjustment of steam turbine one-level is drawn gas, described the second modulating valve (3.2) connects a cold reheat pipe road, described cold reheat pipe road is connected with the steam line between described medium pressure steam generator (2.5) and described middle pressure superheater (2.4).
2. the cogeneration system of combined cycle according to claim 1, it is characterized in that: the downstream tandem of described first order reducing-and-cooling plant (3.3) has second level reducing-and-cooling plant (3.6) or more multistage reducing-and-cooling plant, between the reducing-and-cooling plant of every adjacent two-stage, be equipped with a modulating valve (3.7).
3. the cogeneration system of combined cycle according to claim 1 and 2, 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).
4. the cogeneration system of combined cycle according to claim 3, it is characterized in that: in described, compress into and on steam pipe road, in described upstream of compressing into steam valve group (1.2), be provided with the heat supply network branch road that draws gas, described heat supply network route upstream a to downstream of drawing gas is provided with a modulating valve (3.4) and a reducing-and-cooling plant (3.5) successively.
5. the cogeneration system of combined cycle according to claim 1, is characterized in that: on described high-pressure admission pipeline, in the upstream of described high-pressure admission valve group (1.1), be provided with a bypass duct that connects described cold reheat pipe road; 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, in the upstream of described low pressure admission valve group (1.3), be also provided with a bypass duct, 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 described vapour condenser; Article four, described bypass duct forms a bypath system (4) jointly.
6. the cogeneration system of combined cycle according to claim 5, is characterized in that: on four described bypass ducts, be respectively equipped with a valve.
7. the cogeneration system of combined cycle according to claim 1, is characterized in that: described steam turbine is the structure that high-pressure cylinder divides separately cylinder, mesolow cylinder to close cylinder, or high intermediate pressure cylinder closes the structure that cylinder, low pressure (LP) cylinder divide separately cylinder.
8. the cogeneration system of combined cycle according to claim 1, is characterized in that: the connecting tube between described low-pressure coal saver (2.9) and described oxygen-eliminating device (2.10) is provided with a valve.
9. the cogeneration system of combined cycle according to claim 1, is characterized in that: the connecting pipeline of the steam ouput of described low-pressure steam generator (2.8) and described oxygen-eliminating device (2.10) is provided with a valve.
10. the cogeneration system of combined cycle according to claim 1, is characterized in that: on described low pressure admission pipeline, in the upstream of described low pressure admission valve group (1.3), be provided with a modulating valve group (1.5).
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| CN201320551856.9U CN203499735U (en) | 2013-09-05 | 2013-09-05 | Combined cycle co-generation system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103452611A (en) * | 2013-09-05 | 2013-12-18 | 上海电气电站设备有限公司 | Combined-cycle combined heat and power system |
| CN104456509A (en) * | 2014-11-26 | 2015-03-25 | 北京首钢国际工程技术有限公司 | Method for improving 50 MW gas and steam combined cycle electricity generation capacity |
| CN105697076A (en) * | 2016-04-01 | 2016-06-22 | 杭州燃油锅炉有限公司 | Combined heat and power system of large-scale extracting and condensing steam turbine |
| CN105804809A (en) * | 2016-04-21 | 2016-07-27 | 浙江浙能技术研究院有限公司 | Device and method for improving AGC quality and primary frequency modulation quality of unit |
| CN108351098A (en) * | 2015-11-05 | 2018-07-31 | 株式会社东芝 | Vapor recovery method in vapor recovery system, thermal power generation system and power generation exhaust gas in power generation exhaust gas |
-
2013
- 2013-09-05 CN CN201320551856.9U patent/CN203499735U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103452611A (en) * | 2013-09-05 | 2013-12-18 | 上海电气电站设备有限公司 | Combined-cycle combined heat and power system |
| CN104456509A (en) * | 2014-11-26 | 2015-03-25 | 北京首钢国际工程技术有限公司 | Method for improving 50 MW gas and steam combined cycle electricity generation capacity |
| CN108351098A (en) * | 2015-11-05 | 2018-07-31 | 株式会社东芝 | Vapor recovery method in vapor recovery system, thermal power generation system and power generation exhaust gas in power generation exhaust gas |
| CN105697076A (en) * | 2016-04-01 | 2016-06-22 | 杭州燃油锅炉有限公司 | Combined heat and power system of large-scale extracting and condensing steam turbine |
| CN105804809A (en) * | 2016-04-21 | 2016-07-27 | 浙江浙能技术研究院有限公司 | Device and method for improving AGC quality and primary frequency modulation quality of unit |
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