CN114046557B - Flexible adjustment device for cogeneration and operation method thereof - Google Patents
Flexible adjustment device for cogeneration and operation method thereof Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 299
- 238000005338 heat storage Methods 0.000 claims abstract description 139
- 238000000605 extraction Methods 0.000 claims abstract description 31
- 230000001105 regulatory effect Effects 0.000 claims abstract description 24
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims description 48
- 238000010438 heat treatment Methods 0.000 claims description 26
- 238000001816 cooling Methods 0.000 claims description 13
- 239000000498 cooling water Substances 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 3
- 238000009833 condensation Methods 0.000 claims description 2
- 230000005494 condensation Effects 0.000 claims description 2
- 239000002918 waste heat Substances 0.000 abstract description 11
- 230000005611 electricity Effects 0.000 abstract description 2
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- 238000010248 power generation Methods 0.000 description 5
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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
- F24D11/00—Central heating systems using heat accumulated in storage masses
- F24D11/002—Central heating systems using heat accumulated in storage masses water heating system
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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
- F24D2220/00—Components of central heating installations excluding heat sources
- F24D2220/10—Heat storage materials, e.g. phase change materials or static water enclosed in a space
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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
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Abstract
The invention relates to a heat and power cogeneration flexibility adjusting device and an operation method thereof, wherein the device comprises a condenser, a steam heater, a low-temperature heat storage tank and a high-temperature heat storage tank; in the electricity low-valley period, in order to reduce the generated energy of the steam turbine, the steam inlet amount of the steam turbine is reduced, the steam extraction amount is increased, the exhaust steam amount is reduced, the backwater of the low-temperature heat storage tank can be separated out, and the waste heat stored in the peak period is released; and the heat supply is kept stable when the steam extraction amount of the steam turbine is regulated according to the electric load demand by changing the water inlet and outlet direction and flow of the high-temperature heat storage tank. The invention ensures that the cogeneration unit can carry out large-scale electric load adjustment according to the power grid demand, and simultaneously recovers the waste heat of the exhaust steam in a high proportion, thereby ensuring the heat supply capacity of the cogeneration unit and improving the energy efficiency.
Description
Technical Field
The invention relates to a cogeneration adjusting device and an operation method thereof, in particular to a cogeneration flexibility adjusting device based on low heat supply network backwater temperature and an operation method thereof, and belongs to the technical field of energy power.
Background
In recent years, large-scale popularization and application of large-temperature difference long-distance heat supply technology are achieved, and the technology can fully recover waste heat of a thermal power plant far away from a city and economically convey the waste heat to a city load area to provide clean heat supply sources for the city. Along with the increasing proportion of renewable energy power sources, renewable energy power sources such as wind power, photoelectricity and the like have volatility and randomness, and the power generation is limited by objective conditions such as seasons, weather conditions, atmospheric pollution conditions and the like, and belongs to uncontrollable power sources. The thermal power plant belongs to a controllable power supply, and in order to meet the requirements of power supply and demand balance and safe operation of a power grid, the main function of the thermal power plant is to convert the basic load of the power grid into the power supply of peak shaving of the power grid, so that higher requirements are provided for the flexibility of the thermal power plant.
At present, the heat and power cogeneration ratio in the northern heat power plant is high, and the heat and power cogeneration units still operate in a traditional mode of 'heat and power fixation', so that the power generation adjustment capacity is limited by heat supply, and the flexibility is further reduced. At present, in the period of large renewable energy generation of a power grid in winter, when the power generation load of a thermal power plant is limited and the power generation power is required to be reduced, the heat supply capacity is also affected to different degrees.
Therefore, researchers have proposed a low pressure cylinder zero-output technology, a steam turbine only reserves minimum cooling flow for a low pressure cylinder in a deep peak regulation period of an electric power valley period, and most of medium pressure cylinder exhaust steam is used for heat supply, so that the mode meets the requirements of reducing the generating power of a unit in the valley period to a certain extent but not affecting the heat supply capacity. However, in this way, after the power demand is raised in the power peak period, the power plant cannot raise the generated power while ensuring the heat supply.
Disclosure of Invention
In view of the above problems, one of the purposes of the present invention is to provide a low-heat-grid-return-temperature-based cogeneration flexible adjustment device that combines heat storage technology with cogeneration and power plant waste heat recovery, and the device is based on the premise that a heat grid adopts a large-temperature-difference technology to reduce the heat grid return water temperature to 10-30 ℃, and fully uses the characteristic that the heat grid return water temperature is substantially lower than the steam exhaust temperature of a steam turbine, so that the cogeneration unit can perform large-scale electric load adjustment according to the power grid demand, and at the same time, the exhaust steam waste heat is recovered in a high proportion, thereby ensuring the heat supply capacity of the cogeneration unit, improving the energy efficiency, reducing the investment, and improving the economy; another object of the invention is to provide a method of operating such a cogeneration flexibility adjustment device.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
In a first aspect, the invention provides a cogeneration flexibility adjusting device, which comprises a condenser, a steam heater, a low-temperature heat storage tank and a high-temperature heat storage tank; the low-temperature heat storage tank is connected in parallel between a heat supply network water inlet and a heat supply network water outlet of the condenser, and the high-temperature heat storage tank is connected in parallel between the heat supply network water inlet and the heat supply network water outlet of the steam heater; the steam inlet of the condenser is connected with a steam exhaust pipeline of the low-pressure cylinder of the steam turbine, and the steam inlet of the steam heater is connected with a steam extraction pipeline of the low-pressure cylinder of the steam turbine.
The heat supply network water outlet of the condenser and the second water inlet and outlet of the low-temperature heat storage tank are connected to the same pipeline, and then are divided into two pipelines which are respectively connected to the heat supply network water inlet of the steam heater and the first water inlet and outlet of the high-temperature heat storage tank, and the second water inlet and outlet of the high-temperature heat storage tank and the heat supply network water outlet of the steam heater are connected to the same pipeline and then to the heat supply network water supply pipeline.
The combined heat and power flexibility adjusting device preferably further comprises a peak heater, wherein the second water inlet and outlet of the high-temperature heat storage tank and the heat supply network water outlet of the steam heater are connected to the same pipeline and then connected to the heat supply network water inlet of the peak heater, and the heat supply network water outlet of the peak heater is connected to the heat supply network water supply pipeline; and meanwhile, a steam inlet of the peak heater is connected with a steam extraction pipeline of the low-pressure cylinder of the steam turbine.
In a second aspect, the operation method of the cogeneration flexibility adjusting device provided by the invention comprises the following steps:
1) Period of low peak electrical load:
The steam extraction flow of the steam turbine is increased, the exhaust steam flow is correspondingly reduced, the low-temperature heat-storage-tank and the condenser are respectively filled with the backwater of the low-temperature heat-storage-tank, and the backwater flow of the low-temperature heat-storage-tank which is filled into the condenser is regulated according to the exhaust steam flow, so that the water outlet temperature of the heat-storage-tank is kept unchanged;
the rest low-temperature heat-storage net backwater enters a low-temperature heat-storage tank, replaces low-temperature water stored in the low-temperature heat-storage tank, flows out through a first water inlet and outlet of the low-temperature heat-storage tank, and is mixed with medium-temperature water flowing out from a heat-storage net water outlet of a condenser;
Then, after the mixed medium-temperature water is mixed with the water discharged from the high-temperature heat storage tank, the mixed medium-temperature water enters a steam heater for heating, and meanwhile, the water discharge flow of the high-temperature heat storage tank is regulated, so that the water discharge temperature of the heat supply network water of the steam heater is equal to the heat storage temperature required by the high-temperature heat storage tank;
Finally, the high-temperature water outlet of the steam heater is divided into two paths, wherein one path enters the high-temperature heat storage tank, and the other path enters a water supply pipeline of the heat supply network.
2) Peak electrical load time period:
The reduced steam extraction flow of the steam turbine and the exhaust steam flow are correspondingly increased, and after the backwater of the low-temperature heat-storage tank and the low-temperature water discharged from the low-temperature heat-storage tank are mixed, the backwater and the low-temperature water are fed into the condenser together, and the water discharge temperature of the heat-storage water of the condenser is kept unchanged by adjusting the water discharge flow of the low-temperature heat-storage tank;
then, the outlet water of the heat supply network of the condenser is divided into two parts, and the two parts respectively enter a steam heater and a high-temperature heat storage tank for heating and then are mixed, and the mixed heat supply network water is sent into a heat supply network water supply pipeline;
meanwhile, according to the steam extraction flow entering the steam heater, the water flow of the heat supply network entering the steam heater is regulated, so that the mixed heat supply network water temperature meets the heat supply network water supply temperature requirement.
In the operation method, preferably, when the operation method further comprises a peak heater, in the period of the low valley period of the electric load, the water outlet of the steam heater is divided into two paths, one path enters the high-temperature heat storage tank, the other path enters the peak heater, and if the temperature of the water in the heating network is lower than the required water supply temperature of the heating network, the peak heater is started to heat the water in the heating network to the required temperature, and then the water is sent into the water supply pipeline of the heating network;
And in the electric load peak period, the water outlet of the steam heater is mixed with the water outlet of the high-temperature heat storage tank, and if the temperature of the mixed heat supply network water is lower than the required temperature, the peak heater is started to further heat the mixed heat supply network water to the required temperature, and then the mixed heat supply network water is sent into a heat supply network water supply pipeline.
In a third aspect, the invention provides a cogeneration flexibility adjusting device, which comprises a condenser, a steam heater, a low-temperature heat storage tank, a high-temperature heat storage tank and a water-water heat exchanger;
The steam heater and the water-water heat exchanger are connected in series between a heat supply network water return pipeline and a heat supply network water supply pipeline, and the condenser and the water-water heat exchanger form a circulation loop; the low-temperature heat storage tank is connected in parallel between a heat supply network water inlet and a heat supply network water outlet of the water-water heat exchanger, and the high-temperature heat storage tank is connected in parallel between the heat supply network water inlet and the heat supply network water outlet of the steam heater;
the steam inlet of the condenser is connected with a steam exhaust pipeline of the low-pressure cylinder of the steam turbine, and the steam inlet of the steam heater is connected with a steam extraction pipeline of the low-pressure cylinder of the steam turbine.
The heat supply network water return pipeline is preferably connected with a heat supply network water inlet of the water-water heat exchanger and a first water inlet and outlet of the low-temperature heat storage tank, the heat supply network water outlet of the water-water heat exchanger and a second water inlet and outlet of the low-temperature heat storage tank are connected to the same pipeline, and then are divided into two pipelines, and are respectively connected with the heat supply network water inlet of the steam heater and the first water inlet and outlet of the high-temperature heat storage tank, and the second water inlet and outlet of the high-temperature heat storage tank and the heat supply network water outlet of the steam heater are connected to the same pipeline and then connected to the heat supply network water supply pipeline;
The circulating cooling water inlet of the water-water heat exchanger is connected with the circulating cooling water outlet of the condenser, and the circulating cooling water outlet of the water-water heat exchanger is connected with the circulating cooling water inlet of the condenser.
The combined heat and power flexibility adjusting device preferably further comprises a peak heater, wherein the second water inlet and outlet of the high-temperature heat storage tank and the heat supply network water outlet of the steam heater are connected to the same pipeline and then connected to the heat supply network water inlet of the peak heater, and the heat supply network water outlet of the peak heater is connected to the heat supply network water supply pipeline; meanwhile, a steam inlet of the peak heater is connected with a steam extraction pipeline of the low-pressure cylinder of the steam turbine.
In a fourth aspect, the present invention provides an operation method of the above-mentioned cogeneration flexibility adjusting device, including:
1) Period of low peak electrical load:
The steam extraction flow of the steam turbine is increased, the exhaust steam flow is correspondingly reduced, the low-temperature heat-net backwater is respectively fed into the water-water heat exchanger and the low-temperature heat storage tank, the exhaust steam of the steam turbine is fed into the condenser for condensation, and the cooling circulating water flows out of the water-water heat exchanger and is fed into the condenser for heating, and then is fed into the water-water heat exchanger for heat exchange with the low-temperature heat-net backwater; according to the exhaust steam flow, the flow rate of the cooling circulating water entering the water-water heat exchanger is regulated, so that the outlet water temperature of the cooling circulating water of the condenser is kept unchanged, and meanwhile, the return water flow rate of the low-temperature heat network entering the water-water heat exchanger is regulated, so that the outlet water temperature of the heat network water of the water-water heat exchanger is kept unchanged;
The rest low-temperature heat-storage net backwater enters a low-temperature heat-storage tank, replaces low-temperature water stored in the low-temperature heat-storage tank, flows out through a first water inlet and outlet of the low-temperature heat-storage tank, and is mixed with medium-temperature water flowing out from a heat-supply net water outlet of a water-water heat exchanger;
Then, after the mixed medium-temperature water is mixed with the water discharged from the high-temperature heat storage tank, the mixed medium-temperature water enters a steam heater for heating, and meanwhile, the water discharge flow of the high-temperature heat storage tank is regulated, so that the water discharge temperature of the steam heater is equal to the heat storage temperature required by the high-temperature heat storage tank;
Finally, the high-temperature water outlet of the steam heater is divided into two paths, wherein one path enters the high-temperature heat storage tank, and the other path enters a water supply pipeline of the heat supply network.
2) Peak electrical load time period:
The reduced steam turbine extraction flow and the exhaust steam flow are correspondingly increased, and after the low-temperature water backwater of the low-temperature heat storage tank is mixed with the low-temperature water discharged from the low-temperature heat storage tank, the mixture enters the water-water heat exchanger together, the cooling circulating water flow rate entering the water-water heat exchanger is regulated, so that the cooling circulating water discharge temperature of the condenser is kept unchanged, and meanwhile, the low-temperature water backwater flow rate entering the water-water heat exchanger is regulated, so that the heat supply network water discharge temperature of the water-water heat exchanger is kept unchanged;
Then, the outlet water of the heat supply network of the water-water heat exchanger is divided into two parts, and the two parts respectively enter a steam heater and a high-temperature heat storage tank for heating and then are mixed, and the mixed heat supply network water is sent into a heat supply network water supply pipeline;
meanwhile, according to the steam extraction flow entering the steam heater, the water flow of the heat supply network entering the steam heater is regulated, so that the mixed heat supply network water temperature meets the heat supply network water supply temperature requirement.
In the operation method, preferably, when the operation method further comprises a peak heater, in the period of the low valley period of the electric load, the water outlet of the steam heater is divided into two paths, one path enters the high-temperature heat storage tank, the other path enters the peak heater, and if the temperature of the water in the heating network is lower than the required water supply temperature of the heating network, the peak heater is started to heat the water in the heating network to the required temperature, and then the water is sent into the water supply pipeline of the heating network;
And in the electric load peak period, the water outlet of the steam heater is mixed with the water outlet of the high-temperature heat storage tank, and if the temperature of the mixed heat supply network water is lower than the required temperature, the peak heater is started to further heat the mixed heat supply network water to the required temperature, and then the mixed heat supply network water is sent into a heat supply network water supply pipeline.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. In the peak period of electric load, when the steam turbine reduces the steam extraction amount for increasing the generated energy, the device can store the waste heat which cannot be recovered to the valley period for recovery, and simultaneously release the heat from the high-temperature heat storage tank to make up the heat supply requirement; the steam turbine in the low-valley period of the electric load is increased to extract steam and reduce the amount of exhaust steam, the backwater of the low-temperature heat-supply net is stored in the low-temperature tank for recovering the exhaust steam waste heat in the peak period, and the extracted steam is used for heating the water of the heat-supply net and storing water in the high-temperature heat-storage tank; the device realizes the same deep peak regulation capability with the zero output technology of the low-voltage cylinder in the low-voltage period of the electric load, increases the generated energy under the condition that the power supply capability is not reduced in the high-voltage period of the electric load, improves the power generation regulation capability of the cogeneration unit, and improves the energy efficiency of the system.
2. The device of the invention is based on the premise that the heat supply network adopts a large temperature difference technology to reduce the temperature of the heat supply network backwater to 10-30 ℃, fully utilizes the characteristic that the temperature of the heat supply network backwater is greatly lower than the steam exhaust temperature of the steam turbine, combines with the regulation of the steam extraction of the steam turbine, directly stores the low-temperature heat supply network water into the low-temperature heat storage tank in the low-temperature period of electric load, and recovers the exhaust steam waste heat of the steam turbine through direct heat exchange in the high-temperature period of electric load, thereby realizing the transfer of heat between the low-temperature tank and the high-temperature tank without a heat pump and improving the quality, greatly reducing the equipment investment and improving the economical efficiency.
Drawings
Fig. 1 is a schematic structural view of a cogeneration flexibility adjusting device provided in embodiment 1 of the invention;
Fig. 2 is a schematic structural view of a cogeneration flexibility adjusting device provided in embodiment 2 of the invention;
fig. 3 is a schematic structural view of a cogeneration flexibility adjusting device provided in embodiment 3 of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the system or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Moreover, the use of the terms first, second, etc. to define elements is merely for convenience in distinguishing the elements from each other, and the terms are not specifically meant to indicate or imply relative importance unless otherwise indicated.
In the description of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "disposed," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The invention will be described in more detail below with reference to the accompanying drawings. Like elements are denoted by like reference numerals throughout the various figures. For clarity, the various features of the drawings are not drawn to scale.
The invention provides a heat and power cogeneration flexibility adjusting device and an operation method thereof, wherein the device comprises a condenser, a steam heater, a low-temperature heat storage tank and a high-temperature heat storage tank; in the electricity low-valley period, in order to reduce the generated energy of the steam turbine, the steam inlet amount of the steam turbine is reduced, the steam extraction amount is increased, the exhaust steam amount is reduced, the backwater of the low-temperature heat storage tank can be separated out, and the waste heat stored in the peak period is released; and the heat supply is kept stable when the steam extraction amount of the steam turbine is regulated according to the electric load demand by changing the water inlet and outlet direction and flow of the high-temperature heat storage tank and the heating amount of the peak heater. The invention ensures that the cogeneration unit can carry out large-scale electric load adjustment according to the power grid demand, and simultaneously recovers the waste heat of the exhaust steam in a high proportion, thereby ensuring the heat supply capacity of the cogeneration unit and improving the energy efficiency.
Example 1:
As shown in fig. 1, the cogeneration flexibility adjusting device based on low heat supply network backwater temperature provided in this embodiment includes a condenser 1, a steam heater 2, a low-temperature heat storage tank 3 and a high-temperature heat storage tank 4. The condenser 1 and the steam heater 2 are connected in series between a heat supply network water return pipeline and a heat supply network water supply pipeline, the low-temperature heat storage tank 3 is connected with the condenser 1 in parallel, and the high-temperature heat storage tank 4 is connected with the steam heater 2 in parallel. Specifically, the heat supply network water return pipeline is connected with a heat supply network water inlet of the condenser 1 and a bottom water inlet and outlet of the low-temperature heat storage tank 3, a heat supply network water outlet of the condenser 1 and a top water inlet and outlet of the low-temperature heat storage tank 3 are connected to the same pipeline, and then are divided into two pipelines, wherein the two pipelines are respectively connected to the heat supply network water inlet of the steam heater 2 and the bottom water inlet and outlet of the high-temperature heat storage tank 4, and the top water inlet and outlet of the high-temperature heat storage tank 4 and the heat supply network water outlet of the steam heater 2 are connected to the same pipeline, and then are connected to a heat supply network water supply pipeline.
The exhaust pipe of the low pressure cylinder (l.p.) of the steam turbine is connected to the steam inlet of the condenser 1, and the extraction pipe of the low pressure cylinder (i.p.) of the steam turbine is connected to the steam inlet of the steam heater 2.
Based on the heat and power cogeneration flexibility adjusting device based on the low heat supply network backwater temperature provided in the embodiment, the invention also provides an operation method of the heat and power cogeneration flexibility adjusting device, which comprises the following steps:
1) Period of low peak electrical load: the steam extraction flow of the steam turbine is increased, the exhaust steam flow is correspondingly reduced, the low-temperature heat-net backwater enters the condenser 1 and the low-temperature heat storage tank 3 respectively, and the low-temperature heat-net backwater flow entering the condenser 1 is regulated according to the exhaust steam flow, so that the water outlet temperature of the heat-net water of the condenser 1 is kept unchanged; the rest low-temperature heat-storage net backwater enters the low-temperature heat-storage tank 3, replaces low-temperature water stored in the low-temperature heat-storage tank 3, flows out through a water inlet and a water outlet at the top of the low-temperature heat-storage tank 3, and is mixed with medium-temperature water flowing out from a heat-storage net water outlet of the condenser 1; then, the mixed medium-temperature water is mixed with the water discharged from the bottom of the high-temperature heat storage tank 4, and then enters the steam heater 2 for heating, and meanwhile, the water discharged from the bottom of the high-temperature heat storage tank 4 is regulated so that the water discharged from the heat supply network of the steam heater 2 is equal to the heat storage temperature required by the high-temperature heat storage tank 4; finally, the high-temperature water outlet of the steam heater 2 is divided into two paths, wherein one path enters the high-temperature heat storage tank 4, and the other path enters a water supply pipeline of the heat supply network.
2) Peak electrical load time period: reducing the extraction flow of the steam turbine, correspondingly increasing the exhaust flow, mixing the backwater of the low-temperature heat-storage net water with the low-temperature outlet water of the low-temperature heat-storage tank 3, and then feeding the mixture into the condenser 1, and regulating the outlet flow of the low-temperature heat-storage tank 3 to ensure that the outlet water temperature of the heat-storage net water of the condenser 1 is kept unchanged; then, the outlet water of the heat supply network of the condenser 1 is divided into two parts, and the two parts respectively enter the steam heater 2 and the high-temperature heat storage tank 4 for heating and then are mixed, and the mixed heat supply network water is sent into a heat supply network water supply pipeline; meanwhile, according to the steam extraction flow entering the steam heater 2, the water flow of the heat supply network entering the steam heater 2 is regulated, so that the mixed heat supply network water temperature meets the heat supply network water supply temperature requirement.
Example 2:
As shown in fig. 2, the cogeneration flexibility adjusting device based on low heat supply network backwater temperature provided in this embodiment further includes a peak heater 5 on the basis of embodiment 1, and at this time, after the top water inlet and outlet of the high temperature heat storage tank 4 and the water inlet and outlet of the steam heater 2 are connected to the same pipeline, they are connected to the heat supply network water inlet of the peak heater 5, and the heat supply network water outlet of the peak heater 5 is connected to the heat supply network water supply pipeline. Meanwhile, a steam extraction pipe of the low pressure cylinder of the steam turbine is connected to a steam inlet of the spike heater 5.
At this time, in the period of the low valley period of the electric load, the water output from the steam heater 2 is divided into two paths, one path enters the high-temperature heat storage tank 4, the other path enters the peak heater 5, and if the temperature of the water in the heat supply network is lower than the required water supply temperature of the heat supply network, the peak heater 5 is started to heat the water in the heat supply network to the required temperature, and then the water is sent into the water supply pipeline of the heat supply network.
In the electric load peak period, the water outlet of the steam heater 2 is mixed with the water outlet of the high-temperature heat storage tank 4, and if the temperature of the mixed heat supply network water is lower than the required temperature, the peak heater 5 is started to further heat the mixed heat supply network water to the required temperature, and then the mixed heat supply network water is sent into a heat supply network water supply pipeline.
The cogeneration flexibility adjusting device provided by the embodiment is suitable for a system with the water supply temperature of a heat supply network higher than the highest heat storage temperature of the high-temperature heat storage tank 4, and the water stored in the high-temperature heat storage tank 4 is heated to the required temperature by the peak heater 5 and then is supplied to the heat supply network.
Example 3:
as shown in fig. 3, the cogeneration flexibility adjusting device based on low heat supply network backwater temperature provided in this embodiment further includes a water-water heat exchanger 6 based on embodiment 1, where a heat supply network water inlet of the water-water heat exchanger 6 is connected to a heat supply network backwater pipeline, a heat supply network water outlet of the water-water heat exchanger 6 and a top water inlet and outlet of the low temperature heat storage tank 3 are connected to the same pipeline, a circulating cooling water inlet of the water-water heat exchanger 6 is connected to a circulating cooling water outlet of the condenser 1, and a circulating cooling water outlet of the water-water heat exchanger 6 is connected to a circulating cooling water inlet of the condenser 1.
At this time, the operation method of the cogeneration flexibility adjusting device is basically the same as that of the embodiment 1, and the difference is only that the exhaust steam of the steam turbine enters the condenser 1 to be condensed, and the cooling circulating water flows out from the water-water heat exchanger 6 to enter the condenser 1 to be heated, and then flows into the water-water heat exchanger 6 to exchange heat with the heat supply network backwater.
The cogeneration flexibility adjusting device provided by the embodiment is suitable for recovering the waste heat in the cooling circulating water of the unit through the water-water heat exchanger 6 under the condition of insufficient space near the unit.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. The operation method of the cogeneration flexibility adjusting device is characterized in that the device comprises a condenser (1), a steam heater (2), a low-temperature heat storage tank (3), a high-temperature heat storage tank (4) and a peak heater (5);
The condenser (1) and the steam heater (2) are connected in series between a heat supply network water return pipeline and a heat supply network water supply pipeline, the low-temperature heat storage tank (3) is connected in parallel between a heat supply network water inlet and a heat supply network water outlet of the condenser (1), and the high-temperature heat storage tank (4) is connected in parallel between a heat supply network water inlet and a heat supply network water outlet of the steam heater (2); the steam inlet of the condenser (1) is connected with a steam exhaust pipeline of the low-pressure cylinder of the steam turbine, and the steam inlet of the steam heater (2) is connected with a steam extraction pipeline of the low-pressure cylinder of the steam turbine; the heat supply network water return pipeline is connected with a heat supply network water inlet of the condenser (1) and a first water inlet and outlet of the low-temperature heat storage tank (3), a heat supply network water outlet of the condenser (1) and a second water inlet and outlet of the low-temperature heat storage tank (3) are connected to the same pipeline and then divided into two pipelines, the two pipelines are respectively connected to a heat supply network water inlet of the steam heater (2) and a first water inlet and outlet of the high-temperature heat storage tank (4), and a second water inlet and outlet of the high-temperature heat storage tank (4) and a heat supply network water outlet of the steam heater (2) are connected to the same pipeline and then connected to the heat supply network water supply pipeline; the second water inlet and outlet of the high-temperature heat storage tank (4) and the heat supply network water outlet of the steam heater (2) are connected to the same pipeline and then connected to the heat supply network water inlet of the peak heater (5), and the heat supply network water outlet of the peak heater (5) is connected to the heat supply network water supply pipeline; meanwhile, a steam inlet of the peak heater (5) is connected with a steam extraction pipeline of the low-pressure cylinder of the steam turbine, and the operation method comprises the following steps:
1) Period of low peak electrical load:
The steam extraction flow of the steam turbine is increased, the exhaust steam flow is correspondingly reduced, the low-temperature heat-net backwater enters the condenser (1) and the low-temperature heat storage tank (3) respectively, and the low-temperature heat-net backwater flow entering the condenser (1) is regulated according to the exhaust steam flow, so that the water outlet temperature of the heat-net water of the condenser (1) is kept unchanged;
The rest low-temperature heat-accumulating tank (3) is filled with the backwater of the low-temperature heat-accumulating network, the low-temperature water stored in the low-temperature heat-accumulating tank (3) is replaced, and the backwater flows out through a first water inlet and outlet of the low-temperature heat-accumulating tank (3) and is mixed with the medium-temperature water flowing out from a heat-accumulating network water outlet of the condenser (1);
then, after the mixed medium-temperature water is mixed with the water discharged from the high-temperature heat storage tank (4), the mixed medium-temperature water enters the steam heater (2) for heating, and meanwhile, the water discharge flow of the high-temperature heat storage tank (4) is regulated, so that the water discharge temperature of the heat supply network of the steam heater (2) is equal to the heat storage temperature required by the high-temperature heat storage tank (4);
Finally, the high-temperature water outlet of the steam heater (2) is divided into two paths, wherein one path enters a high-temperature heat storage tank (4) and the other path enters a water supply pipeline of a heat supply network;
2) Peak electrical load time period:
The reduced steam turbine extraction flow and the exhaust steam flow are correspondingly increased, and after the backwater of the low-temperature heat-storage tank (3) and the low-temperature water outlet of the low-temperature heat-storage tank are mixed, the backwater and the low-temperature water outlet of the low-temperature heat-storage tank enter the condenser (1) together, and the temperature of the heat-storage tank (1) heat-storage water outlet is kept unchanged by adjusting the water outlet flow of the low-temperature heat-storage tank (3);
then, the outlet water of the heat supply network of the condenser (1) is divided into two parts, and the two parts enter a steam heater (2) and a high-temperature heat storage tank (4) respectively for heating and then are mixed, and the mixed heat supply network water is sent into a heat supply network water supply pipeline;
meanwhile, according to the steam extraction flow entering the steam heater (2), the water flow of the heat supply network entering the steam heater (2) is regulated, so that the mixed heat supply network water temperature meets the heat supply network water supply temperature requirement.
2. The operation method according to claim 1, wherein when the operation method further comprises a peak heater (5), during the period of the low peak period of the electric load, the outlet water of the steam heater (2) is divided into two paths, the first path enters the high-temperature heat storage tank (4), the second path enters the peak heater (5), and if the temperature of the second path of heat supply network water is lower than the required heat supply network water supply temperature, the peak heater (5) is started to heat the second path of heat supply network water to the required temperature, and then the second path of heat supply network water is sent to the heat supply network water supply pipeline;
In the electric load peak period, the water outlet of the steam heater (2) is mixed with the water outlet of the high-temperature heat storage tank (4), and if the temperature of the mixed heat supply network water is lower than the required temperature, the peak heater (5) is started to heat the mixed heat supply network water to the required temperature, and then the mixed heat supply network water is sent into a heat supply network water supply pipeline.
3. The operation method of the cogeneration flexibility adjusting device is characterized in that the device comprises a condenser (1), a steam heater (2), a low-temperature heat storage tank (3), a high-temperature heat storage tank (4), a water-water heat exchanger (6) and a peak heater (5); the steam heater (2) and the water-water heat exchanger (6) are connected in series between a heat supply network water return pipeline and a heat supply network water supply pipeline, and the condenser (1) and the water-water heat exchanger (6) form a circulation loop; the low-temperature heat storage tank (3) is connected in parallel between a heat supply network water inlet and a heat supply network water outlet of the water-water heat exchanger (6), and the high-temperature heat storage tank (4) is connected in parallel between the heat supply network water inlet and the heat supply network water outlet of the steam heater (2); the steam inlet of the condenser (1) is connected with a steam exhaust pipeline of the low-pressure cylinder of the steam turbine, and the steam inlet of the steam heater (2) is connected with a steam extraction pipeline of the low-pressure cylinder of the steam turbine; the heat supply network water return pipeline is connected with a heat supply network water inlet of the water-water heat exchanger (6) and a first water inlet and outlet of the low-temperature heat storage tank (3), a heat supply network water outlet of the water-water heat exchanger (6) and a second water inlet and outlet of the low-temperature heat storage tank (3) are connected to the same pipeline, and then are divided into two pipelines which are respectively connected to a heat supply network water inlet of the steam heater (2) and a first water inlet and outlet of the high-temperature heat storage tank (4), and a second water inlet and outlet of the high-temperature heat storage tank (4) and a heat supply network water outlet of the steam heater (2) are connected to the same pipeline, and then are connected to the heat supply network water supply pipeline; the circulating cooling water inlet of the water-water heat exchanger (6) is connected with the circulating cooling water outlet of the condenser (1), and the circulating cooling water outlet of the water-water heat exchanger (6) is connected with the circulating cooling water inlet of the condenser (1); the second water inlet and outlet of the high-temperature heat storage tank (4) and the heat supply network water outlet of the steam heater (2) are connected to the same pipeline and then connected to the heat supply network water inlet of the peak heater (5), and the heat supply network water outlet of the peak heater (5) is connected to a heat supply network water supply pipeline; meanwhile, the steam inlet of the peak heater (5) is connected with a steam extraction pipeline of a low-pressure cylinder of the steam turbine, and the operation method comprises the following steps:
1) Period of low peak electrical load:
The steam extraction flow of the steam turbine is increased, the exhaust steam flow is correspondingly reduced, the low-temperature heat-net backwater enters the water-water heat exchanger (6) and the low-temperature heat storage tank (3) respectively, the exhaust steam of the steam turbine enters the condenser (1) for condensation, and the cooling circulating water flows out of the water-water heat exchanger (6) and enters the condenser (1) for heating, and then flows into the water-water heat exchanger (6) for heat exchange with the low-temperature heat-net backwater; according to the exhaust steam flow, the flow rate of cooling circulation water entering the water-water heat exchanger (6) is regulated, so that the outlet water temperature of cooling circulation water of the condenser (1) is kept unchanged, and meanwhile, the return water flow rate of a low-temperature heat supply network entering the water-water heat exchanger (6) is regulated, so that the outlet water temperature of heat supply network water of the water-water heat exchanger (6) is kept unchanged;
The rest low-temperature heat-storage net backwater enters a low-temperature heat-storage tank (3), low-temperature water stored in the low-temperature heat-storage tank (3) is replaced, and flows out through a first water inlet and outlet of the low-temperature heat-storage tank (3) to be mixed with medium-temperature water flowing out from a heat-supply net water outlet of a water-water heat exchanger (6);
Then, after the mixed medium-temperature water is mixed with the water discharged from the high-temperature heat storage tank (4), the mixed medium-temperature water enters the steam heater (2) for heating, and meanwhile, the water discharge flow of the high-temperature heat storage tank (4) is regulated, so that the water discharge temperature of the steam heater (2) is equal to the heat storage temperature required by the high-temperature heat storage tank (4);
Finally, the high-temperature water outlet of the steam heater (2) is divided into two paths, wherein one path enters a high-temperature heat storage tank (4) and the other path enters a water supply pipeline of a heat supply network;
2) Peak electrical load time period:
the reduced steam turbine extraction flow is correspondingly increased, and after the low-temperature heat-net water backwater is mixed with the low-temperature water discharged from the low-temperature heat storage tank (3), the mixture enters the water-water heat exchanger (6), the cooling circulating water flow rate entering the water-water heat exchanger (6) is regulated, so that the cooling circulating water discharge temperature of the condenser (1) is kept unchanged, and meanwhile, the low-temperature heat-net backwater flow rate entering the water-water heat exchanger (6) is regulated, so that the heat-net water discharge temperature of the water-water heat exchanger (6) is kept unchanged;
then, the outlet water of the heat supply network of the water-water heat exchanger (6) is divided into two strands, and the two strands enter a steam heater (2) and a high-temperature heat storage tank (4) respectively for heating and then are mixed, and the mixed heat supply network water is sent into a heat supply network water supply pipeline;
meanwhile, according to the steam extraction flow entering the steam heater (2), the water flow of the heat supply network entering the steam heater (2) is regulated, so that the mixed heat supply network water temperature meets the heat supply network water supply temperature requirement.
4. A method of operating a heating system according to claim 3, wherein when the heating system further comprises a peak heater (5), during the period of the low peak period of the electrical load, the outlet water from the steam heater (2) is split into two paths, the first path enters the high temperature heat storage tank (4) and the second path enters the peak heater (5), and if the temperature of the water in the second path is lower than the required water supply temperature of the heating system, the peak heater (5) is started to heat the water in the second path to the required temperature, and then the water is sent to the water supply pipeline of the heating system;
In the electric load peak period, the water outlet of the steam heater (2) is mixed with the water outlet of the high-temperature heat storage tank (4), and if the temperature of the mixed heat supply network water is lower than the required temperature, the peak heater (5) is started to heat the mixed heat supply network water to the required temperature, and then the mixed heat supply network water is sent into a heat supply network water supply pipeline.
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