CN110714805A - Steam system and method for eliminating zero-output cold source loss of low-pressure cylinder - Google Patents
Steam system and method for eliminating zero-output cold source loss of low-pressure cylinder Download PDFInfo
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- CN110714805A CN110714805A CN201911032370.2A CN201911032370A CN110714805A CN 110714805 A CN110714805 A CN 110714805A CN 201911032370 A CN201911032370 A CN 201911032370A CN 110714805 A CN110714805 A CN 110714805A
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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
- F24D3/18—Hot-water central heating systems using heat pumps
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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
- F24D2200/00—Heat sources or energy sources
- F24D2200/12—Heat pump
- F24D2200/123—Compression type heat 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 discloses a steam system and a method for eliminating the loss of a zero-output cold source of a low-pressure cylinder, wherein the steam system comprises a high-pressure cylinder, a medium-pressure cylinder, a steam turbine and a compression heat pump; the exhaust steam of intermediate pressure jar divide into four branches, and first branch road links to each other with the entry of heat supply network heater, and the second branch road links to each other with the entry of low pressure jar, and the third branch road links to each other with the hot side entry of compression heat pump, and the fourth branch road links to each other with the entry of steam turbine. When the cogeneration unit operates under the working condition of zero output of the low pressure cylinder in the heat supply season, the steam inlet of the low pressure cylinder is stopped, and most of the exhausted steam of the intermediate pressure cylinder is conveyed to the heat supply network heater for heat supply; in addition, a small part of the exhaust steam of the intermediate pressure cylinder and the exhaust steam of the steam turbine are mixed and then enter a compression type heat pump, the compression type heat pump is used for recovering the waste heat of the compression type heat pump, the circulating water of a heat supply network is heated, the steam after temperature reduction and pressure reduction enters a low pressure cylinder to take away the blast heat generated by the rotation of a low pressure rotor, and the purposes of reducing the loss of a cooling steam cold source, improving the heat supply capacity and improving the running economy of.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to a steam system and a method for eliminating zero output cold source loss of a low-pressure cylinder.
[ background of the invention ]
Along with the development of urbanization, the urban scale is continuously enlarged, and the population of urban areas is continuously increased. In winter, in order to ensure the health of people, the heat supply of northern cities is indispensable. At present, the town heat supply is mainly centralized heat supply, and a heat and power cogeneration unit is mainly used for bearing the heat supply task. The traditional heat supply mode mainly adopts a medium-low pressure communicating pipe for steam extraction and heat supply, and the heat supply capacity is influenced by the power generation load of a steam turbine set, namely the heat coupling. The higher the load of the unit is, the stronger the heat supply capacity is, otherwise, the smaller the load is, and the insufficient steam extraction and heat supply capacity can be caused under the condition of low load, so that the heat supply quality is influenced.
Meanwhile, with global warming, environmental protection issues are increasingly gaining global attention. In order to realize clean power generation and reduce carbon emission, new energy sources such as solar energy, wind power, hydroelectric power and the like are vigorously developed in all countries in the world. In recent years, the installed capacity of new energy electric power such as wind power, photovoltaic and hydropower is continuously and rapidly increased. In order to improve the on-grid electric quantity of clean energy, the thermal power generating unit has to reduce the power generation power, so that the steam extraction and heat supply capacity is insufficient, and the heat supply safety is challenged. With the improvement of the living standard of people, the requirement on the living quality is higher and higher, and the result is obviously unacceptable.
On the other hand, new energy sources such as wind power, photovoltaic and the like provide a large amount of clean power, and the randomness and instability of the generated output of the new energy sources also bring great challenges to the safe operation and power supply guarantee of a power system. In order to ensure the operation safety of a power grid, a thermal power generating unit faces higher peak load regulation pressure, even if the cogeneration unit is not exceptional, the cogeneration unit is caused to operate in a low load mode for a long time in winter. Under the peak shaving state, the generating load of the cogeneration unit is only 40-50% of the design, even lower, and the heating capacity is limited. Along with the development of cities, the heating area of cities and towns is further enlarged, the number of thermal power utilization hours is continuously reduced, and the contradiction that the expansion of heating needs and the 'thermoelectric coupling' cause the limitation of heating capacity is further increased.
In order to improve the operation flexibility of a cogeneration unit, reduce the thermoelectric coupling degree and improve the heat supply capacity of the unit, the low-pressure cylinder has zero output and is used as a novel heat supply reconstruction technology, and the low-pressure cylinder is low in reconstruction cost, short in period and flexible in operation and is widely applied. The main principle of the low-pressure cylinder zero-output technology is as follows: under the working condition of heat supply, under the high-vacuum operation condition of the low-pressure cylinder, the original steam inlet pipeline of the low-pressure cylinder is cut off by adopting a hydraulic butterfly valve which can be completely sealed, and a small amount of cooling steam is introduced through a newly-added bypass pipeline and is used for taking away the blast heat generated by the rotation of the low-pressure rotor after the steam inlet of the low-pressure cylinder is cut off. The cooling steam has no special requirements for steam pressure and temperature level and does not require very high pressures and temperatures. The cooling steam in the zero-output technology of the low-pressure cylinder is directly taken from the exhaust steam of the medium-pressure cylinder, the pressure and temperature levels are high, the working capacity is still high, if the cooling steam is directly used for cooling, the waste of the working capacity is caused, the steam part has large cold source loss, and the full utilization of energy cannot be realized.
[ summary of the invention ]
The invention aims to solve the problem that the low-pressure cylinder zero-output technology adopted by a cogeneration unit in the prior art still has cold source loss, and provides a steam system and a method for eliminating the low-pressure cylinder zero-output cold source loss.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a steam system for eliminating zero force heat sink loss for low pressure cylinders comprising:
the high-pressure cylinder is connected with the intermediate-pressure cylinder;
the exhaust steam of the intermediate pressure cylinder is divided into four branches, the first branch is connected with the inlet of the heat supply network heater, the second branch is connected with the inlet of the low pressure cylinder, the third branch is connected with the inlet of the hot side of the compression heat pump, and the fourth branch is connected with the inlet of the water feed pump driving steam turbine; the exhaust steam of the low pressure cylinder is connected with the inlet of the condenser;
the water feeding pump drives the steam turbine, the exhaust steam of the water feeding pump driving steam turbine is divided into two branches, the first branch is connected to the hot side inlet of the compression type heat pump after being converged with the third branch of the intermediate pressure cylinder exhaust steam, and the second branch is connected to the inlet of the condenser after being converged with the exhaust steam of the low pressure cylinder;
the hot side outlet of the compression heat pump is merged with the second branch exhaust of the intermediate pressure cylinder and then connected to the inlet of the low pressure cylinder; and a part of the circulating water of the heat supply network is connected to the cold side of the compression heat pump through a pipeline and exchanges heat with the exhaust steam passing through the hot side of the compression heat pump.
The invention further improves the following steps:
the water feeding pump driving turbine is also connected with a water feeding pump used for driving the unit to feed water.
A first valve is arranged on a third branch of the exhaust steam of the intermediate pressure cylinder; a second valve and a flowmeter are sequentially arranged on a pipeline of a hot side outlet of the compression heat pump, and an outlet of the flowmeter is connected to an inlet of the low pressure cylinder after being converged with a second branch of the medium pressure cylinder exhaust; a third valve is arranged on a first branch of the steam discharge of the steam turbine driven by the feed water pump; a fourth valve is arranged at the inlet or the outlet of the cold side of the compression heat pump; and a fifth valve is arranged on the second branch of the middle pressure cylinder for exhausting steam.
A first valve is arranged on a third branch of the exhaust steam of the intermediate pressure cylinder; a second valve and a flowmeter are sequentially arranged on a pipeline of a hot side outlet of the compression heat pump, and an outlet of the flowmeter is connected to an inlet of the low pressure cylinder after being converged with a second branch of the medium pressure cylinder exhaust; a third valve is arranged on the first branch of the steam turbine exhaust; a fourth valve is arranged at the inlet or the outlet of the cold side of the compression heat pump; and a fifth valve is arranged on the second branch of the middle pressure cylinder for exhausting steam.
A method for eliminating zero output heat source loss of a low-pressure cylinder comprises the following steps:
i. when the unit enters a heating period in winter:
maintaining the steam extraction and heat supply mode, closing the first valve, the second valve, the third valve and the fourth valve, and opening the fifth valve; all the circulating water of the heat supply network enters the heat supply network heater, part of the steam discharged by the intermediate pressure cylinder enters the heat supply network heater to heat the circulating water of the heat supply network, and the rest part of the steam enters the low pressure cylinder; the exhaust steam of the steam turbine driven by the feed water pump and the exhaust steam of the low-pressure cylinder of the main machine enter the condenser together to be cooled;
when the unit is switched to the low-pressure cylinder zero-output heating:
closing the fifth valve, opening the first valve, the second valve, the third valve and the fourth valve, directly feeding a part of the circulating water of the heat supply network into the heat supply network heater, and feeding a part of the circulating water into the compression heat pump; the main part of the exhaust steam of the intermediate pressure cylinder directly enters a heating network heater, one part of the exhaust steam passes through a first valve, the water feeding pump drives the exhaust steam of a steam turbine, one part of the exhaust steam enters a condenser, the other part of the exhaust steam passes through a third valve, is mixed with the exhaust steam of the intermediate pressure cylinder passing through the first valve and then enters a compression heat pump to heat the circulating water of the heating part of the heating network, and after entering the compression heat pump, part of the circulating water enters the heating network heater to be mixed with the circulating water of the original heating network and then is; the steam after temperature and pressure reduction in the compression heat pump is taken as cooling steam and enters the low pressure cylinder through the second valve to play a cooling role; the flow of the cooling steam is adjusted through the first valve and the third valve, and the cooling steam which is cooled to the low pressure cylinder enters the condenser to be condensed and returns to the hot well.
Compared with the prior art, the invention has the following beneficial effects:
when the cogeneration unit operates under the working condition of zero output of the low pressure cylinder in the heat supply season, the steam inlet of the low pressure cylinder is stopped, and most of the exhausted steam of the intermediate pressure cylinder is conveyed to the heat supply network heater to heat the circulating water of the heat supply network; in addition, a small part of the medium pressure cylinder exhaust steam and the feed pump drive steam turbine exhaust steam are mixed and then enter a compression type heat pump, the compression type heat pump is used for recovering waste heat, heating heat supply network circulating water, the steam after temperature reduction and pressure reduction enters a low pressure cylinder to take away blast heat generated by rotation of a low pressure rotor, and the purposes of reducing cooling steam cold source loss, improving heat supply capacity and improving unit operation economy are achieved.
The invention recovers part of heat of cooling steam when the low-pressure cylinder operates with zero output, and reduces the loss of a cold source of the unit; meanwhile, part of the waste heat of the exhaust steam of the water feeding pump is recovered, and the heat supply capacity of the unit is increased; finally, the system of the invention has simple structure and reliable operation, and can switch the low-pressure cylinder cooling steam source at any time according to the actual situation; in addition, the invention has simple operation mode, is easy to realize and does not influence the original operation mode of the unit.
[ description of the drawings ]
FIG. 1 is a schematic diagram of a steam system according to the present invention.
Wherein: 1-a high pressure cylinder; 2-intermediate pressure cylinder; 3-a compression heat pump; 4-low pressure cylinder; 5-a first valve; 6-a second valve; 7-a flow meter; 8-a third valve; 9-a fourth valve; 10-driving a steam turbine by a feed pump; 11-a feed pump; 12-a condenser; 13-a fifth valve; 14-heating network heater.
[ detailed description ] embodiments
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Various structural schematics according to the disclosed embodiments of the invention are shown in the drawings. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
In the context of the present disclosure, when a layer/element is referred to as being "on" another layer/element, it can be directly on the other layer/element or intervening layers/elements may be present. In addition, if a layer/element is "on" another layer/element in one orientation, then that layer/element may be "under" the other layer/element when the orientation is reversed.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
the invention relates to a technology capable of eliminating the loss of a cold source of cogeneration, which aims to improve the heat supply capacity of a cogeneration unit, reduce the loss of the cold source of cooling steam and improve the running economy of the cogeneration unit on the basis of ensuring the cooling of a low pressure cylinder by arranging an exhaust steam pressure lifting device, recovering the cooling steam of the low pressure cylinder when the low pressure cylinder has zero output by using a compression heat pump and heating the circulating water of a heat supply network by driving the exhaust steam waste heat of a steam turbine by a feed pump.
As shown in fig. 1, the structural principle of the present invention is as follows:
the invention discloses a steam system for eliminating the zero-output cold source loss of a low-pressure cylinder, which comprises a high-pressure cylinder 1, an intermediate-pressure cylinder 2, a low-pressure cylinder 4 and a heat network heater 14; the high-pressure cylinder 1 is connected with the intermediate-pressure cylinder 2, the exhaust steam of the intermediate-pressure cylinder 2 is divided into four branches, the first branch is connected with the inlet of the heat supply network heater 14, the second branch is connected with the inlet of the low-pressure cylinder 4, the third branch is connected with the inlet of the hot side of the compression heat pump 3, and the fourth branch is connected with the inlet of the water feeding pump driving turbine 10; the exhaust steam of the low pressure cylinder 4 is connected with the inlet of a condenser 12; the exhaust steam of the water feeding pump driving turbine 10 is divided into two branches, the first branch is converged with the third branch of the exhaust steam of the intermediate pressure cylinder 2 and then connected to the hot side inlet of the compression type heat pump 3, and the second branch is converged with the exhaust steam of the low pressure cylinder 4 and then connected to the inlet of the condenser 12; the water feeding pump driving turbine 10 is also connected with a water feeding pump 11 for driving the unit to feed water; the hot side outlet of the compression heat pump 3 is merged with the second branch exhaust of the intermediate pressure cylinder 2 and then connected to the inlet of the low pressure cylinder 4; and a part of the circulating water of the heat supply network is connected to the cold side of the compression heat pump 3 through a pipeline and exchanges heat with the inlet steam passing through the hot side of the compression heat pump 3.
A first valve 5 is arranged on a third branch of the exhaust steam of the intermediate pressure cylinder 2; a second valve 6 and a flowmeter 7 are sequentially arranged on a pipeline of a hot side outlet of the compression heat pump 3, and an outlet of the flowmeter 7 is connected to an inlet of the low pressure cylinder 4 after being converged with a second branch of the exhaust steam of the intermediate pressure cylinder 2; a third valve 8 is arranged on a first branch of the steam exhaust of the water feeding pump driving steam turbine 10; a fourth valve 9 is arranged at the inlet or the outlet of the cold side of the compression heat pump 3; and a fifth valve 13 is arranged on a second branch of the exhaust steam of the intermediate pressure cylinder 2.
The invention discloses a method for eliminating the zero-output cold source loss of a low-pressure cylinder, which comprises the following steps of:
i. when the unit enters a heating period in winter:
maintaining the steam extraction and heat supply mode, closing the first valve 5, the second valve 6, the third valve 8 and the fourth valve 9, and opening the fifth valve 13; all the circulating water of the heat supply network enters the heat supply network heater 14, part of the steam discharged by the intermediate pressure cylinder 2 enters the heat supply network heater 14 to heat the circulating water of the heat supply network, and the rest enters the low pressure cylinder 4; the water feeding pump 11 drives the exhaust steam of the steam turbine 10 and the exhaust steam of the main machine low pressure cylinder 4 to enter the condenser 12 together for cooling;
when the unit is switched to the low-pressure cylinder zero-output heating:
and closing the fifth valve 13, opening the first valve 5, the second valve 6, the third valve 8 and the fourth valve 9, directly feeding a part of the circulating water of the heat supply network into the heat supply network heater 14, and feeding a part of the circulating water of the heat supply network into the compression heat pump 3. The main part of the exhaust steam of the intermediate pressure cylinder 2 directly enters a heat supply network heater 14, one part of the exhaust steam passes through a first valve 5, a water feeding pump 11 drives a steam turbine 10, one part of the exhaust steam enters a condenser 12, the other part of the exhaust steam passes through a third valve 8, is mixed with the exhaust steam of the intermediate pressure cylinder 2 passing through the first valve 5 and then enters a compression heat pump 3 to heat the heat supply network circulating water, and the part of the circulating water entering the compression heat pump 3 is heated and then enters the heat supply network heater 14 to be mixed with the original heat supply network circulating water and then is continuously heated. The steam after temperature and pressure reduction in the compression heat pump 3 is taken as cooling steam and enters the low pressure cylinder 4 through the second valve 6 to play a cooling role. The flow of the cooling steam is adjusted through the first valve 5 and the third valve 8, and the cooling steam which is cooled by the low-pressure cylinder 4 enters the condenser 12 to be condensed and returns to the hot well.
The principle of the invention is as follows:
in the heating season, the heat supply cogeneration unit firstly adopts a communicating pipe steam extraction and heat supply mode, and at the moment, a compression type heat pump is not put into use; if the heating capacity of the communicating pipe steam extraction heating mode is insufficient and meets the heating requirement, the mode is switched to the low-pressure cylinder zero-output heating mode, a middle-low pressure communicating pipe heating butterfly valve is closed, the low-pressure cylinder steam inlet is cut off, and a cooling steam pipeline system is opened; most of the exhaust steam of the intermediate pressure cylinder enters a heat supply network heater to heat the circulating water of the heat supply network, one part of the exhaust steam is mixed with the exhaust steam of the steam turbine and then enters a compression type heat pump to heat the circulating water of the heat supply network, the mixed steam after temperature reduction and pressure reduction enters the low pressure cylinder to play a cooling role, the cooled steam enters a condenser to be condensed, and the condensed water enters a hot well. The low-pressure cylinder cooling steam pipeline is provided with the flowmeter, plays a role in monitoring the flow of steam entering the low-pressure cylinder, and achieves the functions of regulating as required and flexibly controlling the flow of the cooling steam through the cooling steam pipeline and the valve adjustment of the steam turbine exhaust pipeline.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (5)
1. A steam system for eliminating zero force heat sink loss from a low pressure cylinder, comprising:
the high-pressure cylinder (1), the high-pressure cylinder (1) is connected with the intermediate-pressure cylinder (2);
the steam exhaust of the medium pressure cylinder (2) is divided into four branches, the first branch is connected with an inlet of a heat supply network heater (14), the second branch is connected with an inlet of a low pressure cylinder (4), the third branch is connected with a hot side inlet of a compression heat pump (3), and the fourth branch is connected with an inlet of a water feed pump driving turbine (10); the exhaust steam of the low pressure cylinder (4) is connected with the inlet of a condenser (12);
the steam turbine (10) is driven by the water feeding pump, the exhaust steam of the steam turbine (10) is divided into two branches, the first branch is converged with the third branch of the exhaust steam of the intermediate pressure cylinder (2) and then connected to the hot side inlet of the compression type heat pump (3), and the second branch is converged with the exhaust steam of the low pressure cylinder (4) and then connected to the inlet of the condenser (12);
the hot side outlet of the compression heat pump (3) is merged with the second branch exhaust of the intermediate pressure cylinder (2) and then connected to the inlet of the low pressure cylinder (4); and a part of the circulating water of the heat supply network is connected to the cold side of the compression heat pump (3) through a pipeline and exchanges heat with the exhaust steam passing through the hot side of the compression heat pump (3).
2. The steam system for eliminating the loss of the zero output heat sink of the low pressure cylinder as claimed in claim 1, wherein a feed pump (11) for driving the unit feed water is further connected to the feed pump driving turbine (10).
3. The steam system for eliminating the zero output heat source loss of the low pressure cylinder as recited in claim 1, wherein a first valve (5) is disposed on a third branch of the exhaust steam of the intermediate pressure cylinder (2); a second valve (6) and a flowmeter (7) are sequentially arranged on a pipeline of a hot side outlet of the compression heat pump (3), and an outlet of the flowmeter (7) is connected to an inlet of the low pressure cylinder (4) after being converged with a second branch of the exhaust steam of the intermediate pressure cylinder (2); a third valve (8) is arranged on a first branch of the water feeding pump driving steam turbine (10) for exhausting steam; a fourth valve (9) is arranged at the inlet or the outlet of the cold side of the compression heat pump (3); a fifth valve (13) is arranged on a second branch of the exhaust steam of the intermediate pressure cylinder (2).
4. The steam system for eliminating the zero output heat sink loss of the low pressure cylinder as claimed in claim 2, wherein the third branch of the exhaust steam of the intermediate pressure cylinder (2) is provided with a first valve (5); a second valve (6) and a flowmeter (7) are sequentially arranged on a pipeline of a hot side outlet of the compression heat pump (3), and an outlet of the flowmeter (7) is connected to an inlet of the low pressure cylinder (4) after being converged with a second branch of the exhaust steam of the intermediate pressure cylinder (2); a third valve (8) is arranged on a first branch of the steam turbine (10) for exhausting steam; a fourth valve (9) is arranged at the inlet or the outlet of the cold side of the compression heat pump (3); a fifth valve (13) is arranged on a second branch of the exhaust steam of the intermediate pressure cylinder (2).
5. A method for eliminating the zero force heat sink loss of a low pressure cylinder using the system of claim 4, comprising the steps of:
i. when the unit enters a heating period in winter:
maintaining the steam extraction and heat supply mode, closing the first valve (5), the second valve (6), the third valve (8) and the fourth valve (9), and opening the fifth valve (13); all the circulating water of the heat supply network enters the heat supply network heater (14), part of the steam discharged by the intermediate pressure cylinder (2) enters the heat supply network heater (14) to heat the circulating water of the heat supply network, and the rest part enters the low pressure cylinder (4); the water feeding pump (11) drives the exhaust steam of the turbine (10) and the exhaust steam of the main machine low pressure cylinder (4) to enter the condenser (12) together for cooling;
when the unit is switched to the low-pressure cylinder zero-output heating:
closing the fifth valve (13), opening the first valve (5), the second valve (6), the third valve (8) and the fourth valve (9), directly feeding a part of the heat supply network circulating water into the heat supply network heater (14), and feeding a part of the heat supply network circulating water into the compression heat pump (3); the main part of the exhaust steam of the intermediate pressure cylinder (2) directly enters a heat supply network heater (14), one part of the exhaust steam passes through a first valve (5), a water feeding pump (11) drives the exhaust steam of a steam turbine (10), one part of the exhaust steam enters a condenser (12), the other part of the exhaust steam passes through a third valve (8), and is mixed with the exhaust steam of the intermediate pressure cylinder (2) passing through the first valve (5) to enter a compression heat pump (3) to heat part of heat supply network circulating water, and after entering the compression heat pump (3), part of the circulating water is heated, enters the heat supply network heater (14) to be mixed with the original heat supply network circulating water and is continuously heated; the steam after temperature and pressure reduction in the compression heat pump (3) is taken as cooling steam and enters the low pressure cylinder (4) through the second valve (6) to play a role in cooling; the flow of the cooling steam is adjusted through the first valve (5) and the third valve (8), and the cooling steam after cooling the low-pressure cylinder (4) enters the condenser (12) to be condensed and returns to the hot well.
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| CN201911032370.2A CN110714805A (en) | 2019-10-28 | 2019-10-28 | Steam system and method for eliminating zero-output cold source loss of low-pressure cylinder |
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| CN111486536A (en) * | 2020-04-30 | 2020-08-04 | 赫普能源环境科技股份有限公司 | Summer cooling system for thermal power plant and heat supply pipe network and operation method |
| CN111852592A (en) * | 2020-06-22 | 2020-10-30 | 西安交通大学 | Steam-free operation system and method based on thermal power intermediate reheating type condenser unit |
| CN114810250A (en) * | 2022-04-14 | 2022-07-29 | 重庆赛迪热工环保工程技术有限公司 | Power generation thermodynamic system for reducing heat loss of steam turbine exhaust |
| CN114922704A (en) * | 2022-05-18 | 2022-08-19 | 西安热工研究院有限公司 | Steam turbine set power generation system capable of running safely under low load |
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2019
- 2019-10-28 CN CN201911032370.2A patent/CN110714805A/en active Pending
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| CN111486536A (en) * | 2020-04-30 | 2020-08-04 | 赫普能源环境科技股份有限公司 | Summer cooling system for thermal power plant and heat supply pipe network and operation method |
| CN111852592A (en) * | 2020-06-22 | 2020-10-30 | 西安交通大学 | Steam-free operation system and method based on thermal power intermediate reheating type condenser unit |
| CN111852592B (en) * | 2020-06-22 | 2021-11-19 | 西安交通大学 | Steam-free operation system and method based on thermal power intermediate reheating type condenser unit |
| CN114810250A (en) * | 2022-04-14 | 2022-07-29 | 重庆赛迪热工环保工程技术有限公司 | Power generation thermodynamic system for reducing heat loss of steam turbine exhaust |
| CN114922704A (en) * | 2022-05-18 | 2022-08-19 | 西安热工研究院有限公司 | Steam turbine set power generation system capable of running safely under low load |
| CN114922704B (en) * | 2022-05-18 | 2024-03-26 | 西安热工研究院有限公司 | Turbine unit power generation system capable of safely running under low load |
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