CN114526473B - Deep peak shaving heat supply system based on furnace water cooler and thermal decoupling control method - Google Patents
Deep peak shaving heat supply system based on furnace water cooler and thermal decoupling control method Download PDFInfo
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- CN114526473B CN114526473B CN202111631471.9A CN202111631471A CN114526473B CN 114526473 B CN114526473 B CN 114526473B CN 202111631471 A CN202111631471 A CN 202111631471A CN 114526473 B CN114526473 B CN 114526473B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 142
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000002485 combustion reaction Methods 0.000 claims abstract description 32
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 230000001105 regulatory effect Effects 0.000 claims description 38
- 238000000605 extraction Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000004781 supercooling Methods 0.000 claims description 3
- 239000003245 coal Substances 0.000 claims description 2
- 230000001276 controlling effect Effects 0.000 claims 2
- 238000001704 evaporation Methods 0.000 claims 1
- 230000008020 evaporation Effects 0.000 claims 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 2
- 239000003546 flue gas Substances 0.000 abstract description 2
- 239000000567 combustion gas Substances 0.000 abstract 1
- 238000010248 power generation Methods 0.000 description 7
- 230000009466 transformation Effects 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000008016 vaporization Effects 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/08—Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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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
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
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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
-
- 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
- F24D2200/06—Solid fuel fired boiler
- F24D2200/062—Coal fired boilers
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention discloses a deep peak regulation heating system based on a furnace water cooler and a thermal decoupling control method. According to the invention, heat exchange is carried out by utilizing the boiler water of the down tube of the boiler and the water of the medium-temperature heat network, so that heat energy in the hearth is indirectly converted into heat supply load to be externally supplied, the stable combustion and flue gas denitration efficiency of the boiler in the low load of the unit in the heat supply period are ensured, the heat supply capacity of the unit is improved, the problem of outstanding thermoelectric contradiction in the heat supply period in the current northern area is effectively solved, and the thermoelectric decoupling operation is realized.
Description
Technical Field
The invention belongs to the technical field of cogeneration and boiler operation, and particularly relates to a deep peak shaving heat supply system based on a boiler water cooler and a thermal decoupling control method.
Background
Currently, with the continuous improvement of the ratio of renewable energy sources such as wind power, photovoltaic and the like and the instability of grid-connected power generation, the peak shaving capacity of a coal-fired unit is also continuously facing new challenges. In particular, during heating in northern areas, as the urban process is continuously advanced, the heat supply load is larger and larger, and the operation mode of 'heat fixation and electricity supply' is added, the heat and electricity cogeneration unit also responds to the power grid dispatching on the premise of meeting the national heat supply, and the contradiction between heat supply and power generation is increasingly outstanding.
Aiming at a cogeneration unit, two existing deep peak regulation flexibility transformation technologies are mainly adopted, one is to cut off a low-pressure cylinder for transformation, and the technology can reduce the unit electric load to 30% in the heating period under the condition of meeting the stable combustion state of a boiler, but the steam discharge flow of a medium-pressure cylinder is correspondingly reduced at the moment, the heating capacity is reduced, and the operation of thermal decoupling cannot be completely realized; the other is high-low bypass transformation, and the technology mainly utilizes main steam and reheat steam to directly supply heat through temperature and pressure reduction. The main steam temperature and pressure reduction heat supply can not be limited by the steam extraction quantity, but the heat supply by utilizing high-quality main steam and reheat steam is contrary to the basic principle of energy cascade utilization, and the boiler reheater is easy to be overtemperature due to improper transformation.
In order to respond to power grid dispatching, if long-time low-load operation of a unit is to be realized, the primary problem is stable combustion of a boiler. At present, the stable combustion below 40% load of the boiler cannot be realized by simply using a novel combustor, a combustion-supporting system is required to be added, on the one hand, the operation cost of a unit is greatly improved by adding oil and flame retardance, and on the other hand, the safe operation of a dust remover and desulfurization equipment can be influenced by greasy dirt generated by long-time combustion.
In addition, the low-load operation of the boiler causes the problems of low smoke discharge temperature, low efficiency of denitration equipment, high nitrogen oxide, low-temperature corrosion of the air preheater, blockage of the air preheater and the like, the environment-friendly requirement cannot be met, and the power consumption of a fan is increased.
Therefore, under the premise that the cogeneration unit ensures stable combustion of the boiler, the operation of thermal decoupling is realized, the heat supply requirement can be met, and the power grid dispatching can be responded in time, so that the problem to be solved urgently is solved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a more flexible and safe peak shaving heat supply system and a thermocouple control method, wherein a furnace water cooler is used for cooling furnace water in a boiler descending tube, heat energy in a hearth is indirectly converted into heat supply load to be externally supplied through heat exchange between the furnace water cooler and high-temperature furnace water, so that the combustion of a boiler is ensured to be enhanced, the combustion of a main steam parameter is ensured to be stable, the working condition in the hearth is also kept away from a stable combustion critical area along with the continuous improvement of the heat exchange power of the furnace water cooler, the operation of unit thermocouple is well realized, the exhaust gas temperature is improved under the working condition of not increasing the power generation load, and the operation range of a denitration system is further widened.
The invention solves the problems by adopting the following technical scheme: the deep peak regulation heating system based on the boiler water cooler is characterized in that on the basis of a conventional coal-fired boiler structure, a boiler water cooler is connected between a boiler downcomer and a furnace bottom header, a high-pressure side inlet of the boiler water cooler is connected with the boiler downcomer, a high-pressure side outlet of the boiler water cooler is connected with the furnace bottom header, a high-pressure side inlet valve and a high-pressure side inlet regulating valve are arranged on a high-pressure side inlet pipeline of the boiler water cooler, and a high-pressure side outlet valve is arranged on a high-pressure side outlet pipeline of the boiler water cooler; a bypass pipeline of the boiler water cooler is arranged between the boiler downcomer and the boiler bottom header, and a high-pressure side bypass regulating valve is arranged on the bypass pipeline of the boiler water cooler; the low-pressure side inlet pipeline of the furnace water cooler is connected to the heat supply network heater, a speed-regulating booster pump is arranged on the low-pressure side inlet pipeline of the furnace water cooler, medium-temperature heat supply network water is introduced into the low-pressure side inlet pipeline of the furnace water cooler, the medium-temperature heat supply network water is obtained after the temperature and the pressure of the low-temperature heat supply network backwater sequentially pass through the heat supply network heater and the speed-regulating booster pump, a low-pressure side inlet pressure sensor, a low-pressure side inlet temperature sensor and a speed-regulating booster pump inlet valve are sequentially arranged at an inlet of the speed-regulating booster pump, and a low-pressure side inlet valve is arranged at an outlet of the speed-regulating booster pump; the outlet of the heat supply network heater is connected with a medium-temperature heat supply network water mother pipe, a heat supply network circulating pump and a connecting valve are arranged on the medium-temperature heat supply network water mother pipe, a low-pressure side outlet pipe of the furnace water cooler is combined with the medium-temperature heat supply network water mother pipe, a low-pressure side outlet valve, a low-pressure side outlet pressure sensor, a low-pressure side outlet temperature sensor and a low-pressure side outlet flow sensor are arranged on the low-pressure side outlet pipe of the furnace water cooler, the medium-temperature heat supply network water is heated into heat supply network water through the furnace water cooler, the heat supply network water is mixed into heat supply network water with a certain temperature through the outlet of the low-pressure side outlet pipe of the furnace water cooler; the speed regulation booster pump and the furnace water cooler are provided with a recirculation bypass, and a low-pressure side bypass regulating valve is arranged on the recirculation bypass.
The thermal decoupling control method comprises the following steps:
1) When the boiler water cooler enters a heating period, a high-pressure side inlet valve, a high-pressure side inlet regulating valve and a high-pressure side outlet valve are opened, so that the boiler water cooler is in a hot standby state, and the high-pressure side bypass regulating valve keeps the maximum opening;
2) When the electric load demand is reduced and stable combustion cannot be ensured in a boiler furnace or heating steam extraction cannot meet the heat load demand, opening an inlet valve of a speed-regulating booster pump, starting the speed-regulating booster pump, opening a low-pressure side inlet valve and a low-pressure side outlet valve, and introducing medium-temperature water heated by a hot-net heater into a boiler water cooler; the temperature of the furnace water entering the furnace bottom header is reduced, partial heat generated by combustion of the hearth is indirectly taken away by the heat supply network water, and the heat supply capacity of the unit is improved while the stable combustion of the boiler is maintained;
3) When the electric load demand is continuously reduced or the heat load is continuously increased, the heat exchange quantity of the middle-temperature heat network water and the furnace water in the boiler descending tube is increased by increasing the rotation speed of the speed-regulating booster pump and opening the high-pressure side inlet regulating valve, so that the heat supply capacity of the unit is improved while the stable combustion in the boiler furnace is maintained;
4) When the electric load demand is raised or the heat load is lowered, the heat exchange quantity of the medium-temperature heat network water and the furnace water in the boiler downcomer is reduced by reducing the rotation speed of the speed-regulating booster pump and closing the high-pressure side inlet regulating valve.
Furthermore, the heat exchange power can be calculated in real time through the low-pressure side inlet pressure sensor, the low-pressure side inlet temperature sensor, the low-pressure side outlet pressure sensor, the low-pressure side outlet temperature sensor and the low-pressure side outlet flow sensor, and the parameters are further converted into the boiler coal burning quantity and serve as monitoring objects for stable combustion of the boiler.
Furthermore, the arrangement of the recirculation bypass advantageously reduces the inlet and outlet end difference of the furnace water cooler.
Further, in order to prevent the low-pressure side outlet high-temperature hot-net water of the furnace water cooler from vaporizing, the opening degree of the low-pressure side bypass regulating valve is regulated to control the temperature of the high-temperature hot-net water outlet, so that a certain amount of supercooling degree is maintained.
Further, to obtain higher temperature heat supply network water without vaporization, the low pressure side heat supply network water of the furnace water cooler is converged into the outlet pipeline of the heat supply network circulating pump with higher pressure.
Furthermore, when the stable combustion or heat supply requirement of the boiler cannot be met by increasing the rotation speed of the speed-regulating booster pump and opening the high-pressure side inlet regulating valve, the heat exchange quantity is further improved by closing the high-pressure side bypass regulating valve.
Further, the first adjusting means of the heat exchange amount of the furnace water cooler is a speed-regulating booster pump, the second adjusting means is a high-pressure side inlet adjusting valve, and the third adjusting means is a high-pressure side bypass adjusting valve.
Compared with the prior art, the invention has the following advantages and effects: the invention indirectly converts heat energy in the hearth into heat supply load to be supplied outwards by utilizing the heat exchange between the furnace water of the boiler downcomer and the medium-temperature heat network water, ensures stable combustion of the boiler and flue gas denitration efficiency when a unit is in low load in the heat supply period under the working condition of not increasing the power generation load, improves the heat supply capacity of the unit, effectively solves the problem of outstanding thermoelectric contradiction in the heat supply period in the current northern area, and realizes thermoelectric decoupling operation.
Drawings
Fig. 1 is a schematic diagram of the system architecture of the present invention.
Fig. 2 is a schematic diagram of the structure of the invention applied to the heat supply regulation of the unit pump-condensing/cut-cylinder operation.
In the figure: the boiler comprises a boiler downcomer 1, a furnace header 2, a boiler water cooler 3, a high-pressure side inlet valve 4, a high-pressure side inlet regulating valve 5, a high-pressure side outlet valve 6, a high-pressure side bypass regulating valve 7, a heating network heater 8, a speed regulation booster pump 9, a low-pressure side inlet pressure sensor 10, a low-pressure side inlet temperature sensor 11, a speed regulation booster pump inlet valve 12, a low-pressure side inlet valve 13, a heating network circulating pump 14, a low-pressure side outlet valve 15, a low-pressure side outlet pressure sensor 16, a low-pressure side outlet temperature sensor 17, a low-pressure side outlet flow sensor 18, a low-pressure side bypass regulating valve 19, a connecting valve 20, a medium-pressure cylinder 21, a low-pressure cylinder 22, a medium-low pressure connecting pipe heat supply butterfly valve 23, a high-pressure cylinder 24, a reheater 25 and a superheater 26.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and not limited to the following examples.
Examples
Referring to fig. 1, in the present embodiment, a deep peak-shaving heating system based on a boiler water cooler is based on a conventional coal-fired boiler structure, a boiler water cooler 3 is connected between a boiler downcomer 1 and a furnace header 2, a high-pressure side inlet of the boiler water cooler 3 is connected with the boiler downcomer 1, a high-pressure side outlet of the boiler water cooler 3 is connected with the furnace header 2, a high-pressure side inlet valve 4 and a high-pressure side inlet regulating valve 5 are installed on a high-pressure side inlet pipeline of the boiler water cooler 3, and a high-pressure side outlet valve 6 is installed on a high-pressure side outlet pipeline of the boiler water cooler 3; a bypass pipeline of the boiler water cooler 3 is arranged between the boiler downcomer 1 and the furnace bottom header 2, and a high-pressure side bypass regulating valve 7 is arranged on the bypass pipeline of the boiler water cooler 3; the low-pressure side inlet pipeline of the furnace water cooler 3 is connected to a heat supply network heater 8, a speed-regulating booster pump 9 is arranged on the low-pressure side inlet pipeline of the furnace water cooler 3, medium-temperature heat supply network water is introduced into the low-pressure side inlet pipeline of the furnace water cooler 3, the medium-temperature heat supply network water is obtained after the temperature and the pressure of the low-temperature heat supply network backwater sequentially pass through the heat supply network heater 8 and the speed-regulating booster pump 9, a low-pressure side inlet pressure sensor 10, a low-pressure side inlet temperature sensor 11 and a speed-regulating booster pump inlet valve 12 are sequentially arranged at the inlet of the speed-regulating booster pump 9, and a low-pressure side inlet valve 13 is arranged at the outlet of the speed-regulating booster pump 9; the outlet of the heat supply network heater 8 is connected with a middle-temperature heat supply network water mother pipe, a heat supply network circulating pump 14 and a connecting valve 20 are arranged on the middle-temperature heat supply network water mother pipe, a low-pressure side outlet pipe of the furnace water cooler 3 is combined with the middle-temperature heat supply network water mother pipe, a low-pressure side outlet valve 15, a low-pressure side outlet pressure sensor 16, a low-pressure side outlet temperature sensor 17 and a low-pressure side outlet flow sensor 18 are arranged on the low-pressure side outlet pipe of the furnace water cooler 3, the middle-temperature heat supply network water is heated into heat supply network water through the furnace water cooler 3, and the heat supply network water with a certain temperature is mixed into heat supply network water through the outlet of the low-pressure side outlet pipe of the furnace water cooler 3; the speed-regulating booster pump 9 and the furnace water cooler 3 are provided with a recirculation bypass, on which a low-pressure side bypass regulating valve 19 is mounted.
The thermal decoupling control method comprises the following steps:
1. When the boiler water cooler 3 enters a heating period, the high-pressure side inlet valve 4, the high-pressure side inlet regulating valve 5 and the high-pressure side outlet valve 6 are opened, so that the boiler water cooler 3 is in a hot standby state, and the high-pressure side bypass regulating valve 7 keeps the maximum opening;
2. When the electric load demand is reduced and stable combustion cannot be ensured in a boiler furnace or heating steam extraction cannot meet the heat load demand, opening an inlet valve 12 of a speed-regulating booster pump, starting the speed-regulating booster pump 9, opening a low-pressure side inlet valve 13 and a low-pressure side outlet valve 15, and introducing medium-temperature water heated by a hot-net heater 8 into a boiler water cooler 3; the temperature of the furnace water entering the furnace bottom header 2 is reduced, partial heat generated by combustion of the hearth is indirectly taken away by the heat supply network water, and the heat supply capacity of the unit is improved while the stable combustion of the boiler is maintained;
3. When the electric load demand is continuously reduced or the heat load is continuously increased, the heat exchange quantity of the medium-temperature heat network water and the furnace water in the boiler downcomer 1 is increased by increasing the rotation speed of the speed-regulating booster pump 9 and opening the high-pressure side inlet regulating valve 5, so that the heat supply capacity of the unit is improved while the stable combustion in the boiler furnace is maintained;
4. When the electric load demand rises or the heat load falls, the heat exchange quantity of the medium-temperature heat network water and the furnace water in the boiler downcomer 1 is reduced by reducing the rotation speed of the speed-regulating booster pump 9 and closing the high-pressure side inlet regulating valve 5.
In this embodiment, the heat exchange power can be calculated in real time by the low pressure side inlet pressure sensor 10, the low pressure side inlet temperature sensor 11, the low pressure side outlet pressure sensor 16, the low pressure side outlet temperature sensor 17 and the low pressure side outlet flow sensor 18, and the parameters are further converted into the boiler fire amount as the monitoring objects of stable combustion of the boiler. To prevent the low-pressure side outlet hot-net water of the furnace water cooler 3 from vaporizing, the opening of the low-pressure side bypass regulating valve 19 is regulated to control the outlet temperature of the hot-net water so as to maintain a certain amount of supercooling. When the stable combustion or heat supply requirement of the boiler cannot be met by increasing the rotation speed of the speed-regulating booster pump 9 and opening the high-pressure side inlet regulating valve 5, the heat exchange amount is further improved by closing the high-pressure side bypass regulating valve 7.
In the present embodiment, the first means for adjusting the heat exchange amount of the boiler water cooler 3 is a speed-adjusting booster pump 9, the second means is a high-pressure side inlet adjusting valve 5, and the third means is a high-pressure side bypass adjusting valve 7.
As shown in fig. 2, the invention is applied to a cylinder cutting operation unit, taking a 300MW unit as an example, and enters a heating period, and a high-pressure side inlet valve 4, a high-pressure side inlet regulating valve 5 and a high-pressure side outlet valve 6 are opened to enable a furnace water cooler 3 to be in a hot standby state; when the unit runs under low load, the low-pressure cylinder 22 is cut off through the medium-low pressure communication pipe heating butterfly valve 23, steam discharged by the medium-pressure cylinder 21 enters the heat supply network heater 8, and the power generation load can be reduced to 30% at the lowest when the boiler is in stable combustion by only cutting the cylinder; if the power generation load is reduced to below 30% or the heat supply load cannot be met, opening the speed-regulating booster pump inlet valve 12, starting the speed-regulating booster pump 9, opening the low-pressure side inlet valve 13 and the low-pressure side outlet valve 15, introducing medium-temperature hot-net water into the furnace water cooler 3 for heat exchange, and reducing the temperature of the furnace water to strengthen the combustion of the hearth, and separating from a stable combustion critical area, so that the power generation load and the heat supply load are reduced while stable combustion is met.
What is not described in detail in this specification is all that is known to those skilled in the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the invention is not limited to the embodiments described above, but is capable of modification and variation without departing from the spirit and scope of the present invention.
Claims (5)
1. The deep peak regulation heating system based on the boiler water cooler is characterized in that the boiler water cooler (3) is connected between a boiler downcomer (1) and a furnace bottom header (2) of a coal-fired boiler, a high-pressure side inlet of the boiler water cooler (3) is connected with the boiler downcomer (1), a high-pressure side outlet of the boiler water cooler (3) is connected with the furnace bottom header (2), a high-pressure side inlet valve (4) and a high-pressure side inlet regulating valve (5) are arranged on a high-pressure side inlet pipeline of the boiler water cooler (3), and a high-pressure side outlet valve (6) is arranged on a high-pressure side outlet pipeline of the boiler water cooler (3); a bypass pipeline of the boiler water cooler (3) is arranged between the boiler downcomer (1) and the furnace bottom header (2), and a high-pressure side bypass regulating valve (7) is arranged on the bypass pipeline of the boiler water cooler (3); the low-pressure side inlet pipeline of the furnace water cooler (3) is connected to the heat supply network heater (8), a speed-regulating booster pump (9) is arranged on the low-pressure side inlet pipeline of the furnace water cooler (3), medium-temperature heat supply network water is introduced into the low-pressure side inlet pipeline of the furnace water cooler (3), the medium-temperature heat supply network water is obtained after the temperature and the pressure of the low-temperature heat supply network water are raised and boosted by the heat supply network heater (8) and the speed-regulating booster pump (9) in sequence, a low-pressure side inlet pressure sensor (10), a low-pressure side inlet temperature sensor (11) and a speed-regulating booster pump inlet valve (12) are sequentially arranged at the inlet of the speed-regulating booster pump (9), and a low-pressure side inlet valve (13) is arranged at the outlet of the speed-regulating booster pump (9); the outlet of the heat supply network heater (8) is connected with a medium-temperature heat supply network water mother pipe, a heat supply network circulating pump (14) and a connecting valve (20) are arranged on the medium-temperature heat supply network water mother pipe, a low-pressure side outlet pipeline of the furnace water cooler (3) is combined with the medium-temperature heat supply network water mother pipe, a low-pressure side outlet valve (15), a low-pressure side outlet pressure sensor (16), a low-pressure side outlet temperature sensor (17) and a low-pressure side outlet flow sensor (18) are arranged on a low-pressure side outlet pipeline of the furnace water cooler (3), the medium-temperature heat supply network water is heated into heat supply network water through the furnace water cooler (3), and the heat supply network water is mixed into heat supply network water with a certain temperature through the outlet of the low-pressure side outlet pipeline of the furnace water cooler (3) which is combined with the heat supply network circulating pump (14); the speed regulating booster pump (9) and the furnace water cooler (3) are provided with a recirculation bypass, and a low-pressure side bypass regulating valve (19) is arranged on the recirculation bypass.
2. A method for controlling thermal decoupling of a furnace water cooler-based deep peak shaving heating system as claimed in claim 1, comprising the steps of:
1) When the boiler water cooler (3) is in a hot standby state by opening a high-pressure side inlet valve (4), a high-pressure side inlet regulating valve (5) and a high-pressure side outlet valve (6), and the high-pressure side bypass regulating valve (7) keeps the maximum opening;
2) When the electric load demand is reduced and stable combustion cannot be ensured in a boiler hearth or heating steam extraction cannot meet the heat load demand, opening an inlet valve (12) of a speed-regulating booster pump, starting the speed-regulating booster pump (9), opening a low-pressure side inlet valve (13) and a low-pressure side outlet valve (15), and introducing medium-temperature water heated by a hot-net heater (8) into a boiler water cooler (3); the temperature of furnace water entering the furnace bottom header (2) is reduced, partial heat generated by combustion of a hearth is indirectly taken away by heat supply network water, stable combustion of a boiler is maintained, and the heat supply capacity of a unit is improved;
3) When the electric load demand is continuously reduced or the heat load is continuously increased, the heat exchange quantity of the middle-temperature heat network water and the furnace water in the boiler descending tube (1) is increased by increasing the rotation speed of the speed-regulating booster pump (9) and opening the high-pressure side inlet regulating valve (5), so that the heat supply capacity of the unit is improved while the stable combustion in the boiler furnace is maintained;
4) When the electric load demand is raised or the heat load is lowered, the heat exchange quantity of the medium-temperature heat network water and the furnace water in the boiler downcomer (1) is reduced by reducing the rotation speed of the speed-regulating booster pump (9) and closing the high-pressure side inlet regulating valve (5).
3. The method for controlling the thermal decoupling of the deep peak shaving heat supply system based on the boiler water cooler according to claim 2, wherein heat exchange power is calculated in real time through a low-pressure side inlet pressure sensor (10), a low-pressure side inlet temperature sensor (11), a low-pressure side outlet pressure sensor (16), a low-pressure side outlet temperature sensor (17) and a low-pressure side outlet flow sensor (18), and then is further converted into boiler coal quantity as a monitoring object of stable combustion of the boiler.
4. The control method for the thermal decoupling of the deep peak shaving heat supply system based on the furnace water cooler according to claim 2, wherein in order to prevent the evaporation of the low-pressure side outlet hot-net water of the furnace water cooler (3), the opening degree of the low-pressure side bypass regulating valve (19) is regulated to control the outlet temperature of the hot-net water so as to keep a certain supercooling degree.
5. The control method of the thermal decoupling of the deep peak shaving heat supply system based on the boiler water cooler according to claim 2, wherein when the stable combustion or heat supply requirement of the boiler cannot be met by increasing the rotation speed of the speed regulation booster pump (9) and opening the high-pressure side inlet regulating valve (5), the heat exchange quantity is further improved by closing the high-pressure side bypass regulating valve (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111631471.9A CN114526473B (en) | 2021-12-28 | 2021-12-28 | Deep peak shaving heat supply system based on furnace water cooler and thermal decoupling control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111631471.9A CN114526473B (en) | 2021-12-28 | 2021-12-28 | Deep peak shaving heat supply system based on furnace water cooler and thermal decoupling control method |
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| Publication Number | Publication Date |
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| CN114526473A CN114526473A (en) | 2022-05-24 |
| CN114526473B true CN114526473B (en) | 2024-04-26 |
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| CN202111631471.9A Active CN114526473B (en) | 2021-12-28 | 2021-12-28 | Deep peak shaving heat supply system based on furnace water cooler and thermal decoupling control method |
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| CN (1) | CN114526473B (en) |
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| CN1032858A (en) * | 1987-10-26 | 1989-05-10 | 刘玉海 | Pressure change-vacuum-phase change radiator |
| CN102563610A (en) * | 2011-10-24 | 2012-07-11 | 上海上电电力工程有限公司 | Energy saving system for boiler |
| CN107062970A (en) * | 2017-01-03 | 2017-08-18 | 中国电力工程顾问集团中南电力设计院有限公司 | The middle temperature phase-change thermal storage thermal desorption system of steam power plant's Large Copacity and its heat accumulation exothermic processes |
| WO2018233024A1 (en) * | 2017-06-22 | 2018-12-27 | 赫普热力发展有限公司 | Thermoelectric decoupling peak load regulating system |
| CN111928228A (en) * | 2020-09-03 | 2020-11-13 | 西安热工研究院有限公司 | Power station boiler high-temperature flue gas coupling reheat steam heat storage deep peak regulation system and method |
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2021
- 2021-12-28 CN CN202111631471.9A patent/CN114526473B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1032858A (en) * | 1987-10-26 | 1989-05-10 | 刘玉海 | Pressure change-vacuum-phase change radiator |
| CN102563610A (en) * | 2011-10-24 | 2012-07-11 | 上海上电电力工程有限公司 | Energy saving system for boiler |
| CN107062970A (en) * | 2017-01-03 | 2017-08-18 | 中国电力工程顾问集团中南电力设计院有限公司 | The middle temperature phase-change thermal storage thermal desorption system of steam power plant's Large Copacity and its heat accumulation exothermic processes |
| WO2018233024A1 (en) * | 2017-06-22 | 2018-12-27 | 赫普热力发展有限公司 | Thermoelectric decoupling peak load regulating system |
| CN111928228A (en) * | 2020-09-03 | 2020-11-13 | 西安热工研究院有限公司 | Power station boiler high-temperature flue gas coupling reheat steam heat storage deep peak regulation system and method |
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| CN114526473A (en) | 2022-05-24 |
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