CN105673100A - Low-pressure steam secondary pressure difference recycle high-power steam turbine asynchronous electricity generating heat supply initial station - Google Patents
Low-pressure steam secondary pressure difference recycle high-power steam turbine asynchronous electricity generating heat supply initial station Download PDFInfo
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- CN105673100A CN105673100A CN201511031644.8A CN201511031644A CN105673100A CN 105673100 A CN105673100 A CN 105673100A CN 201511031644 A CN201511031644 A CN 201511031644A CN 105673100 A CN105673100 A CN 105673100A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/02—Hot-water central heating systems with forced circulation, e.g. by pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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Abstract
The invention provides a low-pressure steam secondary pressure difference recycle high-power steam turbine asynchronous electricity generating heat supply initial station. By means of the low-pressure steam secondary pressure difference recycle high-power steam turbine asynchronous electricity generating heat supply initial station, the problems that in the prior art, the energy utilization rate is low due to the fact that a large amount of secondary pressure difference energy loss still exists when steam-water heat exchange is conducted between low-pressure steam entering the heat supply initial station and heat network back water are solved. The heat supply initial station is connected with a heat supply power plant through a main steam pipe. A negative-pressure steam turbine is connected with the main steam pipe, a negative-pressure heat network heating device and a first asynchronous electricity generating device. The negative-pressure heat network heating device is connected with a vacuum device and a negative-pressure drain pipeline. The negative-pressure drain pipeline is provided with a negative-pressure drain pump. A positive-pressure heat network heating device is connected with the main steam pipe and a positive-pressure drain pipeline. The positive-pressure drain pipeline is provided with a positive-pressure drain pump. The negative-pressure heat network heating device and the positive-pressure heat network heating device are matched to heat the heat network back water of the heat supply initial station into heat network outlet water with the temperature needed by an end user. The first asynchronous electricity generating device is connected with a plant power system of the heat supply power plant.
Description
Technical field
The present invention relates to power plant's heating energy-saving technical field, especially relate to a kind of low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply initial station.
Background technology
Along with the development of heating technology, based on the consideration to environment and energy utilization rate, being incorporated to power-saving technology in heating system, to reach to reduce environmental pollution, improve the purpose of energy utilization rate, wherein, central heating is one of mode realizing above-mentioned purpose. In order to meet the heat demand of urban area, domestic a lot of big power stations and steam power plant carry the task of urban heating heat supply. In view of majority for steam power plant's distance urban district farther out, these all have heat supply initial station for steam power plant in factory, high-temperature-hot-water (this high-temperature-hot-water water temperature is 90-120 DEG C) is externally carried in this heat supply initial station, after high-temperature-hot-water reaches user side, be converted to low-temperature water heating again through water-to-water heat exchanger, meet the demand of user heating heat supply.
Fig. 1 is heat supply network heat supply of the prior art initial station schematic diagram; Based on above-mentioned heat supply approach, with reference to shown in Fig. 1, during heating, the electric turbine of big power station and steam power plant, a large amount of low-pressure steams of a merit be will do, power plant's heat supply initial station, this low-pressure steam pressure >=0.2MPa (G) will be sent to by the steam main B of heat supply plant primary systems A, or, this low-pressure steam pressure≤0.2MPa (G); In heat supply initial station, acted on by heat exchangers for district heating C, this low-pressure steam is used for heating the temperature of outer net circulation water for heating, the recirculated water making temperature relatively low improves temperature, carry and continuing cycling through to outer net is temperature required, it is achieved the cogeneration of heat and power of power plant or steam power plant, in order to save the energy.
But, in above-mentioned heating system, the flow of the low-pressure steam being sent to heat supply initial station by steam main is bigger, pressure is higher, this low-pressure steam pressure >=0.2MPa (G)), or, this low-pressure steam pressure≤0.2MPa (G), and for the heat exchangers for district heating of heat supply initial station, its internal actually required steam pressure is still far below above-mentioned pressure. Therefore, enter a large amount of low-pressure steams of heat supply initial station, after entering heat exchangers for district heating, when carrying out the exchange of soda pop heat with heat supply network backwater (water temperature of this heat supply network backwater is 50-70 DEG C), still suffer from the loss of substantial amounts of secondary pressure difference energy, and lose huge.Illustrate, at heating period, under normal circumstances, the electric turbine of 1 300,000 KW, it is possible to extract the low-pressure steam of more than 300T/H out, and deliver to Gateway Station in Heating Network for steam-water heat exchanging, its pressure is 0.2-0.8MPa, when the outer net return water temperature of Gateway Station in Heating Network is 50-70 DEG C and outer supplying hot water temperature is 90-120 DEG C, its internal required steam pressure is only 0-0.1MPa or even negative pressure. Therefore, when steam enters vapor-water heat exchanger in the above described manner, the effective energy of its loss is 1.6 ten thousand KW-2.8 ten thousand KW, if this effective energy is used, it is possible to reduce station service power consumption rate more than 3%～7%. At present, there is the heat supply electric turbine of some 30-60 ten thousand KW the northern area of China, runs at heating period, and the energy amount of its loss is huge.
In sum, in prior art, when the low-pressure steam of entrance heat supply initial station carries out the exchange of soda pop heat with heat supply network backwater, the problem that there is the loss of a large amount of secondary pressure difference energy, cause that energy utilization rate is low.
Summary of the invention
It is an object of the invention to provide a kind of low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply initial station, the problem causing energy utilization rate low to solve to still suffer from the loss of a large amount of secondary pressure difference energy when the low-pressure steam entering heat supply initial station in prior art carries out the exchange of soda pop heat with heat supply network backwater.
For reaching above-mentioned purpose, embodiments of the invention adopt the following technical scheme that
A kind of low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply initial station, described heat supply initial station is connected by steam main with heat supply plant primary systems, the negative pressure steam turbine of described heat supply initial station is connected with described steam main, power >=the 3000KW of described negative pressure steam turbine, described negative pressure steam turbine be connected to negative pressure heat supply network heater and with its first asynchronous generating device with power, described negative pressure heat supply network heater is connected to vacuum equipment and negative pressure hydrophobic pipeline, and described negative pressure hydrophobic pipeline is equiped with negative pressure drainage pump.
Separately setting, the malleation heat supply network heater of described heat supply initial station is connected with described steam main, and described malleation heat supply network heater is connected to malleation hydrophobic pipeline, and described malleation hydrophobic pipeline is equiped with malleation drainage pump; During use, described negative pressure heat supply network heater coordinates the heat supply network backwater by described heat supply initial station to be heated with described malleation heat supply network heater, is heated to be and has the heat supply network water outlet that end-user system is temperature required.
And set, described first asynchronous generating device electrically connects with the described electricity consumption bus for steam power plant.
Further, described malleation heat supply network heater is connected by malleation steam turbine with described steam main, the power >=4000KW of described malleation steam turbine, and described malleation steam turbine is connected to and its second asynchronous generating device with power.
And set, described second asynchronous generating device electrically connects with the described electricity consumption bus for steam power plant.
Further, it is directed to described negative pressure heat supply network heater and described malleation heat supply network heater, the first embodiment adopted, described negative pressure heat supply network heater is connected with the heat supply network water return pipeline of described heat supply initial station, described malleation heat supply network heater is connected with the heat supply network outlet pipeline of described heat supply initial station, and described negative pressure heat supply network heater is connected by intermediate duct with described malleation heat supply network heater.
And set, described heat supply network water return pipeline is equiped with pressurizer.
Further, it is directed to described negative pressure heat supply network heater and described malleation heat supply network heater, the second embodiment adopted, described negative pressure heat supply network heater is connected respectively with heat supply network water return pipeline and the heat supply network outlet pipeline of described heat supply initial station, and described malleation heat supply network heater is connected respectively with described heat supply network water return pipeline and heat supply network outlet pipeline.
And set, described heat supply network water return pipeline is equiped with pressurizer.
Further, described negative pressure steam turbine is one or more, and described first asynchronous generating device is identical with the number of described negative pressure steam turbine and connects one to one.
Further, described malleation steam turbine is one or more, and described second asynchronous generating device is identical with the number of described malleation steam turbine and connects one to one.
Further, it is directed to described negative pressure heat supply network heater and described malleation heat supply network heater, the first embodiment adopted, described negative pressure heat supply network heater and described malleation heat supply network heater are two heat supply network heaters separate in described heat supply initial station.
Further, it is directed to described negative pressure heat supply network heater and described malleation heat supply network heater, the second embodiment adopted, described negative pressure heat supply network heater and described malleation heat supply network heater merge the heat supply network heater constituting described heat supply initial station, described negative pressure heat supply network heater serves as the negative pressure bringing-up section of described heat supply network heater, and described malleation heat supply network heater serves as the positive pressure heating section of same described heat supply network heater.
Specifically, described negative pressure heat supply network heater offers negative pressure air intake, negative pressure drain port and vacuum suction mouth, described negative pressure steam turbine is connected on described negative pressure air intake, described negative pressure hydrophobic pipeline is connected on described negative pressure drain port, and described vacuum equipment is connected on described suction mouth.
And set, described malleation heat supply network heater offers malleation air intake and malleation drain port, described malleation steam turbine is connected on described malleation air intake, and described malleation hydrophobic pipeline is connected on described malleation drain port.
Further, the first vapour source that is connected between described negative pressure heat supply network heater and described steam main supplements pipeline, and the second vapour source that is connected between described malleation heat supply network heater and described steam main supplements pipeline.
And set, described first vapour source supplements pipeline and described second vapour source supplements and is all equiped with air relief valve on pipeline.
Low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply provided by the invention initial station, during use, low-pressure steam (pressure≤0.8MPa of this low-pressure steam) from steam main is divided into two-way in flowing through way, one tunnel is through negative pressure steam turbine, negative pressure steam turbine is made to drag the first asynchronous generating device generating, the steam discharge of negative pressure steam turbine, enter negative pressure heat supply network heater, another road is directly entered malleation heat supply network heater, negative pressure heat supply network heater coordinates the heat supply network backwater (this heat supply network return water temperature is 50-70 DEG C) by heat supply initial station to be heated with malleation heat supply network heater, it is heated to be and there is the temperature required heat supply network water outlet of end-user system (this heat supply network leaving water temperature is 90-120 DEG C), meanwhile, the condensation water in negative pressure heat supply network heater enters DW system demineralized water system by negative pressure hydrophobic pipeline, and the condensation water in malleation heat supply network heater enters DW system demineralized water system by malleation hydrophobic pipeline, utilizes in order to following cycle, to form complete heat supply initial station.
Owing to the first asynchronous generating device of above-mentioned heat supply initial station is connected by switch cubicle with the station service electrical system for steam power plant, therefore, above-mentioned heat supply initial station, on the basis adopting negative pressure flow process to match with malleation flow process, realize the first asynchronous generating device for providing the purpose of electric energy for steam power plant, directly eat up part of the station-service electricity for steam power plant, it is achieved economizing on energy and electricity.
In prior art, the flow of the low-pressure steam being sent to heat supply initial station by steam main is bigger, pressure is higher, this low-pressure steam pressure >=0.2MPa (G), or, this low-pressure steam pressure≤0.2MPa (G), and for the heat exchangers for district heating of heat supply initial station, its internal actually required steam pressure is still far below above-mentioned pressure.Therefore, enter a large amount of low-pressure steams of heat supply initial station, after entering heat exchangers for district heating, when carrying out the exchange of soda pop heat with heat supply network backwater (water temperature of this heat supply network backwater is 50-70 DEG C), still suffer from the loss of substantial amounts of secondary pressure difference energy, and lose huge. Compared to prior art, low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply provided by the invention initial station, on the basis adopting negative pressure flow process to match with malleation flow process, a large amount of low-pressure steams of the steam power plant of confession in the future main system, with the formal transformation of acting for electric energy, realize the first asynchronous generating device for providing the purpose of electric energy for steam power plant, directly eat up part of the station-service electricity for steam power plant, it is achieved economizing on energy and electricity; The pressure of remaining steam discharge after acting, remains to meet negative pressure heat supply network heater and malleation heat supply network heater carries out the actual pressure requirement of soda pop heat exchange. To sum up, low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply provided by the invention initial station, under ensureing the premise that the heat supply network leaving water temperature of heat supply initial station meets user's request, it is electric energy by the energy conversion that the secondary pressure reduction of a large amount of low-pressure steams has, it is able to abundant recycling, the mode with least cost, largest optimization that realizes provides its required station service for confession steam power plant, and this conceptual design and mechanism make energy utilization rate be greatly improved.
Accompanying drawing explanation
In order to be illustrated more clearly that the specific embodiment of the invention or technical scheme of the prior art, the accompanying drawing used required in detailed description of the invention or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is heat supply network heat supply of the prior art initial station schematic diagram;
Fig. 2 is low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply provided by the invention initial station embodiment one schematic diagram;
Fig. 3 is the schematic diagram of low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply provided by the invention initial station embodiment two;
Fig. 4 is the schematic diagram of low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply provided by the invention initial station embodiment three;
Fig. 5 is the schematic diagram of low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply provided by the invention initial station embodiment four.
Accompanying drawing labelling:
A-heat supply plant primary systems; B-steam main;
C-heat supply network heater;
1-negative pressure steam turbine; 2-malleation steam turbine;
3-the first asynchronous generating device; 4-the second asynchronous generating device;
5-negative pressure heat supply network heater; 6-malleation heat supply network heater;
7-heat supply network water return pipeline; 8-heat supply network outlet pipeline;
9-negative pressure hydrophobic pipeline; 10-malleation hydrophobic pipeline;
11-negative pressure drainage pump; 12-malleation drainage pump;
13-vacuum equipment; 14-intermediate duct;
15-pressurizer.
Detailed description of the invention
Below in conjunction with accompanying drawing, technical scheme is clearly and completely described, it is clear that described embodiment is a part of embodiment of the present invention, rather than whole embodiments. Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
In describing the invention, it should be noted that, orientation or the position relationship of the instruction such as term " " center ", " on ", D score, "left", "right", " vertically ", " level ", " interior ", " outward " be based on orientation shown in the drawings or position relationship; be for only for ease of the description present invention and simplifying and describe; rather than instruction or imply indication device or element must have specific orientation, with specific azimuth configuration and operation, be therefore not considered as limiting the invention. Additionally, term " first ", " second ", " the 3rd " are only for descriptive purposes, and it is not intended that indicate or hint relative importance.
Embodiment one
Fig. 2 is low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply provided by the invention initial station embodiment one schematic diagram, refer to shown in Fig. 1, the low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply initial station that the embodiment of the present invention one provides, it is connected by steam main B with heat supply plant primary systems A, the negative pressure steam turbine 1 of described heat supply initial station is connected with described steam main B, power >=the 3000KW of described negative pressure steam turbine 1, described negative pressure steam turbine 1 be connected to negative pressure heat supply network heater 5 and with its first asynchronous generating device 3 with power, described negative pressure heat supply network heater 5 is connected to vacuum equipment 13 and negative pressure hydrophobic pipeline 9, described negative pressure hydrophobic pipeline 9 is equiped with negative pressure drainage pump 11, the malleation heat supply network heater 6 of described heat supply initial station is connected with described steam main B, and described malleation heat supply network heater 6 is connected to malleation hydrophobic pipeline 10, and described malleation hydrophobic pipeline 10 is equiped with malleation drainage pump 12, during use, described negative pressure heat supply network heater 5 coordinates the heat supply network backwater by described heat supply initial station to be heated with described malleation heat supply network heater 6, is heated to be and has the heat supply network water outlet that end-user system is temperature required, further, described first asynchronous generating device 3 is connected by switch cubicle with the described station service electrical system for steam power plant.
On the basis of the technical characteristic described by the preceding paragraph, further, described negative pressure heat supply network heater 5 is connected with the heat supply network water return pipeline 7 of described heat supply initial station, described malleation heat supply network heater 6 is connected with the heat supply network outlet pipeline 8 of described heat supply initial station, and described negative pressure heat supply network heater 5 is connected by intermediate duct 14 with described malleation heat supply network heater 6; Described heat supply network water return pipeline 7 is equiped with pressurizer 15.
The workflow of the low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply initial station that the embodiment of the present invention one provides is: from most of low-pressure steam of steam main, it is divided into two-way in flowing through way, one tunnel is through negative pressure steam turbine, negative pressure steam turbine is made to drag the first asynchronous generating device generating, the steam discharge of negative pressure steam turbine, enter negative pressure heat supply network heater, heat supply network water return pipeline is supplied to the heat supply network backwater of negative pressure heat supply network heater, to a certain medium temperature between the temperature of heat supply network return water temperature and heat supply network water outlet, (heat supply network return water temperature is 50-70 DEG C in heating, heat supply network leaving water temperature is 90-120 DEG C), another road is directly entered malleation heat supply network heater, negative pressure heat supply network heater is supplied to the heat supply network backwater of malleation heat supply network heater, heat to the temperature needed for end-user system, i.e. heat supply network leaving water temperature, heat supply network outlet pipeline export this heat supply network and discharge water to end-user system.
Embodiment two
Fig. 3 is low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply provided by the invention initial station embodiment two schematic diagram;Refer to shown in Fig. 3, the low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply initial station that the embodiment of the present invention two provides, it is connected by steam main B with heat supply plant primary systems A, the negative pressure steam turbine 1 of described heat supply initial station is connected with described steam main B, power >=the 3000KW of described negative pressure steam turbine 1, described negative pressure steam turbine 1 be connected to negative pressure heat supply network heater 5 and with its first asynchronous generating device 3 with power, described negative pressure heat supply network heater 5 is connected to vacuum equipment 13 and negative pressure hydrophobic pipeline 9, described negative pressure hydrophobic pipeline 9 is equiped with negative pressure drainage pump 11, the malleation heat supply network heater 6 of described heat supply initial station is connected with described steam main B, and described malleation heat supply network heater 6 is connected to malleation hydrophobic pipeline 10, and described malleation hydrophobic pipeline 10 is equiped with malleation drainage pump 12, during use, described negative pressure heat supply network heater 5 coordinates the heat supply network backwater by described heat supply initial station to be heated with described malleation heat supply network heater 6, is heated to be and has the heat supply network water outlet that end-user system is temperature required, further, described first asynchronous generating device 3 is connected by switch cubicle with the described station service electrical system for steam power plant.
On the basis of the technical characteristic described by the preceding paragraph, further, described negative pressure heat supply network heater 5 is connected respectively with heat supply network water return pipeline 7 and the heat supply network outlet pipeline 8 of described heat supply initial station, and described malleation heat supply network heater 6 is connected respectively with described heat supply network water return pipeline 7 and heat supply network outlet pipeline 8; Described heat supply network water return pipeline 7 is equiped with pressurizer 15.
The workflow of the low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply initial station that the embodiment of the present invention two provides is: from most of low-pressure steam of steam main, it is divided into two-way in flowing through way, one tunnel is through negative pressure steam turbine, negative pressure steam turbine is made to drag the first asynchronous generating device generating, the steam discharge of negative pressure steam turbine, enter negative pressure heat supply network heater, heat supply network water return pipeline is supplied to the heat supply network backwater of negative pressure heat supply network heater, to a certain medium temperature between the temperature of heat supply network return water temperature and heat supply network water outlet, (heat supply network return water temperature is 50-70 DEG C in heating, heat supply network leaving water temperature is 90-120 DEG C), another road is directly entered malleation heat supply network heater, heat supply network water return pipeline is supplied to the heat supply network backwater of malleation heat supply network heater, it is heated above the temperature needed for end-user system, there is supplying water and the water supply temperature required higher than terminal use of a certain medium temperature, heat supply network outlet pipeline is mixed in proportion, formed and there is the outer water supply that end-user system is temperature required, and carry out outer confession.
Embodiment three
Fig. 4 is low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply provided by the invention initial station embodiment three schematic diagram, refer to shown in Fig. 4, the low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply initial station that the embodiment of the present invention three provides, it is connected by steam main B with heat supply plant primary systems A, the negative pressure steam turbine 1 of described heat supply initial station is connected with described steam main B, power >=the 3000KW of described negative pressure steam turbine 1, described negative pressure steam turbine 1 be connected to negative pressure heat supply network heater 5 and with its first asynchronous generating device 3 with power, described negative pressure heat supply network heater 5 is connected to vacuum equipment 13 and negative pressure hydrophobic pipeline 9, described negative pressure hydrophobic pipeline 9 is equiped with negative pressure drainage pump 11,The malleation heat supply network heater 6 of described heat supply initial station is connected with described steam main B, and described malleation heat supply network heater 6 is connected to malleation hydrophobic pipeline 10, and described malleation hydrophobic pipeline 10 is equiped with malleation drainage pump 12; During use, described negative pressure heat supply network heater 5 coordinates the heat supply network backwater by described heat supply initial station to be heated with described malleation heat supply network heater 6, is heated to be and has the heat supply network water outlet that end-user system is temperature required; Further, described first asynchronous generating device 3 is connected by switch cubicle with the described station service electrical system for steam power plant.
On the basis of the technical characteristic described by the preceding paragraph, further, described malleation heat supply network heater 6 is connected by malleation steam turbine 2 with described steam main B, power >=the 4000KW of described malleation steam turbine 2, described malleation steam turbine 2 is connected to and its second asynchronous generating device 4 with power; Described second asynchronous generating device 4 is connected by switch cubicle with the described station service electrical system for steam power plant; And, described negative pressure heat supply network heater 5 is connected with the heat supply network water return pipeline 7 of described heat supply initial station, described malleation heat supply network heater 6 is connected with the heat supply network outlet pipeline 8 of described heat supply initial station, and described negative pressure heat supply network heater 5 is connected by intermediate duct 14 with described malleation heat supply network heater 6; Described heat supply network water return pipeline 7 is equiped with pressurizer 15.
The workflow of the low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply initial station that the embodiment of the present invention three provides is: from most of low-pressure steam of steam main, it is divided into two-way in flowing through way, one tunnel is through negative pressure steam turbine, negative pressure steam turbine is made to drag the first asynchronous generating device generating, the steam discharge of negative pressure steam turbine, enter negative pressure heat supply network heater, heat supply network water return pipeline is supplied to the heat supply network backwater of negative pressure heat supply network heater, to a certain medium temperature between the temperature of heat supply network return water temperature and heat supply network water outlet, (heat supply network return water temperature is 50-70 DEG C in heating, heat supply network leaving water temperature is 90-120 DEG C), another road is through malleation steam turbine 2, malleation steam turbine is made to drag the second asynchronous generating device generating, the steam discharge of malleation steam turbine, enter malleation heat supply network heater, negative pressure heat supply network heater is supplied to the heat supply network backwater of malleation heat supply network heater, heat temperature required to end-user system, by heat supply network outlet pipeline output to end-user system.
Embodiment four
Fig. 5 is low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply provided by the invention initial station embodiment four schematic diagram, refer to shown in Fig. 5, the low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply initial station that the embodiment of the present invention four provides, it is connected by steam main B with heat supply plant primary systems A, the negative pressure steam turbine 1 of described heat supply initial station is connected with described steam main B, power >=the 3000KW of described negative pressure steam turbine 1, described negative pressure steam turbine 1 be connected to negative pressure heat supply network heater 5 and with its first asynchronous generating device 3 with power, described negative pressure heat supply network heater 5 is connected to vacuum equipment 13 and negative pressure hydrophobic pipeline 9, described negative pressure hydrophobic pipeline 9 is equiped with negative pressure drainage pump 11, the malleation heat supply network heater 6 of described heat supply initial station is connected with described steam main B, and described malleation heat supply network heater 6 is connected to malleation hydrophobic pipeline 10, and described malleation hydrophobic pipeline 10 is equiped with malleation drainage pump 12, during use, described negative pressure heat supply network heater 5 coordinates the heat supply network backwater by described heat supply initial station to be heated with described malleation heat supply network heater 6, is heated to be and has the heat supply network water outlet that end-user system is temperature required,Further, described first asynchronous generating device 3 is connected by switch cubicle with the described station service electrical system for steam power plant.
On the basis of the technical characteristic described by the preceding paragraph, further, described malleation heat supply network heater 6 is connected by malleation steam turbine 2 with described steam main B, power >=the 4000KW of described malleation steam turbine 2, described malleation steam turbine 2 is connected to and its second asynchronous generating device 4 with power; Described second asynchronous generating device 4 electrically connects with the described electricity consumption bus for steam power plant; Further, described negative pressure heat supply network heater 5 is connected respectively with heat supply network water return pipeline 7 and the heat supply network outlet pipeline 8 of described heat supply initial station, and described malleation heat supply network heater 6 is connected respectively with described heat supply network water return pipeline 7 and heat supply network outlet pipeline 8; Described heat supply network water return pipeline 7 is equiped with pressurizer 15.
The workflow of the low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply initial station that the embodiment of the present invention four provides is: from most of low-pressure steam of steam main, it is divided into two-way in flowing through way, one tunnel is through negative pressure steam turbine, negative pressure steam turbine is made to drag the first asynchronous generating device generating, the steam discharge of negative pressure steam turbine, enter negative pressure heat supply network heater, heat supply network water return pipeline is supplied to the heat supply network backwater of negative pressure heat supply network heater, to a certain medium temperature between the temperature of heat supply network return water temperature and heat supply network water outlet, (heat supply network return water temperature is 50-70 DEG C in heating, heat supply network leaving water temperature is 90-120 DEG C), another road is through malleation steam turbine 2, malleation steam turbine is made to drag the second asynchronous generating device generating, the steam discharge of malleation steam turbine, enter malleation heat supply network heater, negative pressure heat supply network heater is supplied to the heat supply network backwater of malleation heat supply network heater, it is heated above the temperature needed for end-user system, there is supplying water and the water supply temperature required higher than terminal use of a certain medium temperature, heat supply network outlet pipeline is mixed in proportion, formed and there is the outer water supply that end-user system is temperature required, and carry out outer confession.
Test data through reality can obtain, compared to heat supply initial station conventional in prior art, the low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply initial station that the embodiment of the present invention one to embodiment four provides, when ensureing normal heat supply, it is sent to the low-pressure steam in negative pressure heat supply network heater and malleation heat supply network heater, acting through the above-mentioned power negative pressure steam turbine be more than or equal to 3000KW and the first asynchronous generating device, and after the acting of the power malleation steam turbine be more than or equal to 4000KW and the second asynchronous generating device, the 94%-96% of the pressure difference energy entering heat supply initial station low-pressure steam is changed into electric energy, fully recycled, energy-saving effect is obvious.
It should be noted that learnt by real data, under normal circumstances, at Heating Period, the thermoelectricity steam turbine of 1 300,000 KW can be extracted the low-pressure steam of more than 300-400T/H out and be delivered to heat supply initial station, and for soda pop heat exchange heat in heat supply network heater, its pressure is 0.2-0.8MPa; When the heat supply network return water temperature of Gateway Station in Heating Network is 50-70 DEG C, when heat supply network leaving water temperature is 90～120 DEG C, the internal required steam pressure of heat supply network heater is only 0-0.1MPa, or even negative pressure, therefore, when above-mentioned low-pressure steam enters heat supply network heater with above-mentioned flow, the effective energy of its loss is 1.6 ten thousand KW-2.8 ten thousand KW, if this effective energy is fully reclaimed, it is possible to reduce more than the 3%-7% of 300,000 KW Station Service Electrical-Energy rates.At present, the northern area of China has the thermoelectricity steam turbine of some 30-60 ten thousand KW running, adopt provided by the invention for steam power plant's low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply initial station, each Heating Period can save Station Service Electrical-Energy tens thousand of kilowatts, and a Heating Period can save standard coal millions of tons.
Further, consideration based on the scale to this heat supply initial station, according to actual needs, described negative pressure steam turbine can be set for one or more, described first asynchronous generating device is identical with the number of described negative pressure steam turbine, and described negative pressure steam turbine connects one to one with described first asynchronous generating device.
In like manner, can arranging described malleation steam turbine for one or more, described second asynchronous generating device is identical with the number of described malleation steam turbine, and described second asynchronous generating device connects one to one with described malleation steam turbine.
Further, in above-described embodiment one to embodiment four, it is directed to described negative pressure heat supply network heater and described malleation heat supply network heater, can adopting the first embodiment, namely described negative pressure heat supply network heater and described malleation heat supply network heater are two heat supply network heaters separate in described heat supply initial station.
Relative, in above-described embodiment one to embodiment four, it is directed to described negative pressure heat supply network heater and described malleation heat supply network heater, the second embodiment can also be adopted, namely described negative pressure heat supply network heater and described malleation heat supply network heater merge the heat supply network heater constituting described heat supply initial station, described negative pressure heat supply network heater serves as the negative pressure bringing-up section of described heat supply network heater, and described malleation heat supply network heater serves as the positive pressure heating section of same described heat supply network heater.
Specifically, described negative pressure heat supply network heater offers negative pressure air intake, negative pressure drain port and vacuum suction mouth, described negative pressure steam turbine is connected on described negative pressure air intake, described negative pressure hydrophobic pipeline is connected on described negative pressure drain port, and described vacuum equipment is connected on described suction mouth; Offering malleation air intake and malleation drain port on described malleation heat supply network heater, described malleation steam turbine is connected on described malleation air intake, and described malleation hydrophobic pipeline is connected on described malleation drain port.
Further, based on above-mentioned heat supply initial station, the first vapour source that is connected between described negative pressure heat supply network heater and described steam main supplements pipeline, and the second vapour source that is connected between described malleation heat supply network heater and described steam main supplements pipeline; And set, described first vapour source supplements pipeline and described second vapour source supplements and is all equiped with air relief valve on pipeline, using the standby heating vapour source channels as negative pressure heat supply network heater and malleation heat supply network heater, or, supplement as vapour source and regulate passage.
Low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply provided by the invention initial station, during use, low-pressure steam (pressure≤0.8MPa of this low-pressure steam) from steam main is divided into two-way in flowing through way, one tunnel is through negative pressure steam turbine, negative pressure steam turbine is made to drag the first asynchronous generating device generating, the steam discharge of negative pressure steam turbine, enter negative pressure heat supply network heater, another road is directly entered malleation heat supply network heater, negative pressure heat supply network heater coordinates the heat supply network backwater (this heat supply network return water temperature is 50-70 DEG C) by heat supply initial station to be heated with malleation heat supply network heater, it is heated to be and there is the temperature required heat supply network water outlet of end-user system (this heat supply network leaving water temperature is 90-120 DEG C),Meanwhile, the condensation water in negative pressure heat supply network heater enters DW system demineralized water system by negative pressure hydrophobic pipeline, and the condensation water in malleation heat supply network heater enters DW system demineralized water system by malleation hydrophobic pipeline, utilizes in order to following cycle, to form complete heat supply initial station.
Owing to the first asynchronous generating device of above-mentioned heat supply initial station is connected by switch cubicle with the station service electrical system for steam power plant, therefore, above-mentioned heat supply initial station, on the basis adopting negative pressure flow process to match with malleation flow process, realize the first asynchronous generating device for providing the purpose of electric energy for steam power plant, directly eat up part of the power consumption for steam power plant, it is achieved economizing on energy and electricity.
In prior art, the flow of the low-pressure steam being sent to heat supply initial station by steam main is bigger, pressure is higher, this low-pressure steam pressure >=0.2MPa (A)), or, this low-pressure steam pressure≤0.2MPa (G), and for the heat exchangers for district heating of heat supply initial station, its internal actually required steam pressure is still far below above-mentioned pressure. Therefore, enter a large amount of low-pressure steams of heat supply initial station, after entering heat exchangers for district heating, when carrying out the exchange of soda pop heat with heat supply network backwater (water temperature of this heat supply network backwater is 50-70 DEG C), still suffer from the loss of substantial amounts of secondary pressure difference energy, and lose huge. Compared to prior art, low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply provided by the invention initial station, on the basis adopting negative pressure flow process to match with malleation flow process, the pressure difference energy that a large amount of low-pressure steams of the steam power plant of confession in the future main system still suffer from steam-water heat exchanging process, with the formal transformation of acting for electric energy, realize the first asynchronous generating device for providing the purpose of electric energy for steam power plant, directly eat up part of the power consumption for steam power plant, it is achieved economizing on energy and electricity; The pressure of remaining steam discharge after acting, meets negative pressure heat supply network heater and malleation heat supply network heater carries out the actual pressure requirement of soda pop heat exchange. To sum up, low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply provided by the invention initial station, under ensureing the premise that the heat supply network leaving water temperature of heat supply initial station meets user's request, it is electric energy by the energy conversion that the secondary pressure reduction of a large amount of low-pressure steams has, it is able to abundant recycling, the mode with least cost, largest optimization that realizes provides its required station service for confession steam power plant, and this conceptual design and mechanism make energy utilization rate be greatly improved.
It should be noted that, low-pressure steam from the steam main of heat supply plant primary systems, after being changed into electric energy by above-mentioned heat supply initial station, for making this part electric energy enter above-mentioned heat supply plant primary systems in the way of optimization, least cost, supply the station service of steam power plant with a large amount of saving, the adoptable technological means of the embodiment of the present invention is arrange the first asynchronous generating device to be electrically connected by switch cubicle with the station service electrical system for steam power plant; Arrange the second asynchronous generating device to be connected by switch cubicle with the station service electrical system for steam power plant.
Preferably, for ensureing that motion between negative pressure thermoelectricity steam turbine and the first asynchronous generating device can stable delivery, to convert low-pressure steam to greatest extent for available electric energy, in the present embodiment, negative pressure steam turbine is set and is connected by shaft coupling with the first asynchronous generating device; For ensure motion between malleation steam turbine and the second asynchronous generator can stable delivery, to convert low-pressure steam to greatest extent for available electric energy, in the present embodiment, malleation steam turbine is set and is connected by shaft coupling with the second asynchronous generating device.
In describing the invention, it is necessary to explanation, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, for instance, it is possible to it is fixing connection, it is also possible to be removably connect, or connect integratedly; Can be mechanically connected, it is also possible to be electrical connection; Can be joined directly together, it is also possible to be indirectly connected to by intermediary, it is possible to be the connection of two element internals. For the ordinary skill in the art, it is possible to concrete condition understands above-mentioned term concrete meaning in the present invention.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, it is not intended to limit; Although the present invention being described in detail with reference to foregoing embodiments, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein some or all of technical characteristic is carried out equivalent replacement; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply initial station, described heat supply initial station is connected by steam main with heat supply plant primary systems, it is characterised in that
The negative pressure steam turbine of described heat supply initial station is connected with described steam main, power >=the 3000KW of described negative pressure steam turbine, described negative pressure steam turbine be connected to negative pressure heat supply network heater and with its first asynchronous generating device with power, described negative pressure heat supply network heater is connected to vacuum equipment and negative pressure hydrophobic pipeline, and described negative pressure hydrophobic pipeline is equiped with negative pressure drainage pump;
The malleation heat supply network heater of described heat supply initial station is connected with described steam main, and described malleation heat supply network heater is connected to malleation hydrophobic pipeline, and described malleation hydrophobic pipeline is equiped with malleation drainage pump; During use, described negative pressure heat supply network heater coordinates the heat supply network backwater by described heat supply initial station to be heated with described malleation heat supply network heater, is heated to be and has the heat supply network water outlet that end-user system is temperature required;
Described first asynchronous generating device is connected by switch cubicle with the described station service electrical system for steam power plant.
2. low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply according to claim 1 initial station, it is characterized in that, described malleation heat supply network heater is connected by malleation steam turbine with described steam main, power >=the 4000KW of described malleation steam turbine, described malleation steam turbine is connected to and its second asynchronous generating device with power;
Described second asynchronous generating device is connected by switch cubicle with the described station service electrical system for steam power plant.
3. low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply according to claim 2 initial station, it is characterized in that, described negative pressure heat supply network heater is connected with the heat supply network water return pipeline of described heat supply initial station, described malleation heat supply network heater is connected with the heat supply network outlet pipeline of described heat supply initial station, and described negative pressure heat supply network heater is connected by intermediate duct with described malleation heat supply network heater;
Described heat supply network water return pipeline is equiped with pressurizer.
4. low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply according to claim 2 initial station, it is characterized in that, described negative pressure heat supply network heater is connected respectively with heat supply network water return pipeline and the heat supply network outlet pipeline of described heat supply initial station, and described malleation heat supply network heater is connected respectively with described heat supply network water return pipeline and heat supply network outlet pipeline;
Described heat supply network water return pipeline is equiped with pressurizer.
5. the low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply initial station according to claim 3 or 4, it is characterized in that, described negative pressure steam turbine is one or more, and described first asynchronous generating device is identical with the number of described negative pressure steam turbine and connects one to one.
6. low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply according to claim 5 initial station, it is characterized in that, described malleation steam turbine is one or more, and described second asynchronous generating device is identical with the number of described malleation steam turbine and connects one to one.
7. low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply according to claim 6 initial station, it is characterized in that, described negative pressure heat supply network heater and described malleation heat supply network heater are two heat supply network heaters separate in described heat supply initial station.
8. low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply according to claim 6 initial station, it is characterized in that, described negative pressure heat supply network heater and described malleation heat supply network heater merge the heat supply network heater constituting described heat supply initial station, described negative pressure heat supply network heater serves as the negative pressure bringing-up section of described heat supply network heater, and described malleation heat supply network heater serves as the positive pressure heating section of same described heat supply network heater.
9. the confession steam power plant low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply initial station according to claim 7 or 8, it is characterized in that, described negative pressure heat supply network heater offers negative pressure air intake, negative pressure drain port and vacuum and inhales steam ports, described negative pressure steam turbine is connected on described negative pressure air intake, described negative pressure hydrophobic pipeline is connected on described negative pressure drain port, and described vacuum equipment is connected on described suction mouth;
Offering malleation air intake and malleation drain port on described malleation heat supply network heater, described malleation steam turbine is connected on described malleation air intake, and described malleation hydrophobic pipeline is connected on described malleation drain port.
10. low-pressure steam secondary pressure reduction recirculation large steam turbine asynchronous generating heat supply according to claim 9 initial station, it is characterized in that, the first vapour source that is connected between described negative pressure heat supply network heater and described steam main supplements pipeline, and the second vapour source that is connected between described malleation heat supply network heater and described steam main supplements pipeline;
Described first vapour source supplements pipeline and described second vapour source supplements and is all equiped with air relief valve on pipeline.
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