CN114526473A - Deep peak regulation heat supply system based on furnace water cooler and thermoelectric decoupling control method - Google Patents
Deep peak regulation heat supply system based on furnace water cooler and thermoelectric decoupling control method Download PDFInfo
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- CN114526473A CN114526473A CN202111631471.9A CN202111631471A CN114526473A CN 114526473 A CN114526473 A CN 114526473A CN 202111631471 A CN202111631471 A CN 202111631471A CN 114526473 A CN114526473 A CN 114526473A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 140
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000002485 combustion reaction Methods 0.000 claims abstract description 32
- 230000001105 regulatory effect Effects 0.000 claims description 35
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000004891 communication Methods 0.000 claims description 5
- 238000000605 extraction Methods 0.000 claims description 4
- 230000008016 vaporization Effects 0.000 claims description 4
- 239000003245 coal Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000004781 supercooling Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 2
- 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
- 238000010248 power generation Methods 0.000 description 7
- 230000009467 reduction Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 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
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 235000003599 food sweetener Nutrition 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000003765 sweetening agent Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
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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
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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
- F24D2200/06—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
Abstract
The invention discloses a deep peak shaving heat supply system based on a furnace water cooler and a thermoelectric decoupling control method. The invention utilizes the heat exchange between boiler water of a boiler downcomer and medium-temperature heat supply network water, indirectly converts heat energy in a hearth into heat supply load and supplies the heat supply load to the outside, thereby not only ensuring the stable combustion of the boiler and the flue gas denitration efficiency of the unit at low load in the heat supply period, but also improving the heat supply capacity of the unit, effectively solving the problem of outstanding thermoelectric contradiction in the heat supply period of the current northern area, and realizing the thermoelectric decoupling operation.
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 thermoelectric decoupling control method.
Background
Currently, with the continuous improvement of the proportion of renewable energy sources such as wind power and photovoltaic and the instability of grid-connected power generation, the peak shaving capability of a coal-fired unit is continuously facing new challenges. Particularly, during the heating period in the northern area, due to the continuous promotion of the urbanization process, the heat supply load is larger and larger, and the operation mode of 'fixing the power by heat' is added, the cogeneration unit also needs to respond to the power grid dispatching on the premise of meeting the heat supply of the people, and the contradiction between the heat supply and the power generation is more and more prominent day by day.
Aiming at a cogeneration unit, the existing deep peak regulation flexibility transformation technologies mainly comprise two types, one is low-pressure cylinder removal transformation, the technology can reduce the electric load of the unit to 30% during heat supply under the condition of meeting the stable combustion state of a boiler, but the steam discharge flow of an intermediate pressure cylinder is correspondingly reduced at the moment, and the heat supply is reduced, so that the thermoelectric decoupling operation cannot be completely realized; the other is high-low bypass modification, and the technology mainly utilizes main steam and reheated steam to directly supply heat through temperature reduction and pressure reduction. The main steam temperature and pressure reduction heat supply can not be limited by the steam extraction amount, but the heat supply by using the high-quality main steam and the reheat steam is contrary to the basic principle of energy cascade utilization, and the overheat of a boiler reheater is easily caused by improper modification.
In order to respond to power grid dispatching, if long-time low-load operation of a unit is to be realized, the problem which is solved firstly is stable combustion of a boiler. The present novel combustor is used alone and can not realize the stable burning below the boiler 40% load, still need throw combustion-supporting system, throws oily fire-retardant messenger's unit's running cost and improves by a wide margin on the one hand, and the greasy dirt that on the other hand long-time burning produced also can influence the safe operation of dust remover and sweetener.
In addition, the low-load operation of the boiler causes the reduction of the exhaust gas temperature, the reduction of the efficiency of denitration equipment and the increase of nitrogen oxides, so that the problems of low-temperature corrosion of an air preheater, blockage of the air preheater and the like are caused, the environmental protection requirement cannot be met, and the power consumption of a fan is increased.
Therefore, on the premise that the cogeneration unit ensures stable combustion of the boiler, the operation of heat and power decoupling is realized, the heat supply requirement can be met, the power grid dispatching can be responded in time, and the problem to be solved urgently is solved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a more flexible and safer peak-shaving heat supply system and a thermoelectric decoupling control method, wherein a boiler water cooler is used for cooling boiler water in a boiler downcomer, heat energy in a hearth is indirectly converted into heat supply load through heat exchange between boiler water and high-temperature boiler water through the boiler water cooler, and the heat supply load is supplied to the outside, so that the combustion trend of the boiler is enhanced to ensure that the electric load or main steam parameters are stable, the working condition in the hearth is further away from a stable combustion critical area along with the continuous increase of the heat exchange power of the boiler water cooler, the thermoelectric decoupling operation of a unit is well realized, meanwhile, the smoke exhaust temperature is increased under the working condition that the power generation load is not increased, and the commissioning range of a denitration system is further widened.
The technical scheme adopted by the invention for solving the problems is as follows: a deep peak shaving heating system based on a boiler water cooler is characterized in that the boiler water cooler is connected between a boiler down pipe and a boiler bottom header on the basis of a conventional coal-fired boiler structure, a high-pressure side inlet of the boiler water cooler is connected with the boiler down pipe, a high-pressure side outlet of the boiler water cooler is connected with the boiler bottom header, a high-pressure side inlet valve and a high-pressure side inlet adjusting valve are mounted on a high-pressure side inlet pipeline of the boiler water cooler, and a high-pressure side outlet valve is mounted 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 mounted 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 mounted 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 low-temperature heat supply network backwater is heated and boosted sequentially 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 mounted at the inlet of the speed-regulating booster pump in sequence, and a low-pressure side inlet valve is mounted at the 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 main pipe, a heat supply network circulating pump and a communication valve are installed on the medium-temperature heat supply network water main pipe, a low-pressure side outlet pipeline of the furnace water cooler is converged with the medium-temperature heat supply network water main 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 installed on the low-pressure side outlet pipeline of the furnace water cooler, the medium-temperature heat supply network water is heated into high-temperature heat supply network water through the furnace water cooler, and the high-temperature heat supply network water is converged into the outlet of the heat supply network circulating pump through the low-pressure side outlet pipeline of the furnace water cooler and is mixed into heat supply network water with a certain temperature; the speed-regulating booster pump and the furnace water cooler are provided with a recirculation bypass, and a low-pressure side bypass regulating valve is installed on the recirculation bypass.
The thermoelectric decoupling control method comprises the following steps:
1) when entering a heating period, the furnace water cooler is in a hot standby state by opening the high-pressure side inlet valve, the high-pressure side inlet regulating valve and the high-pressure side outlet valve, and the high-pressure side bypass regulating valve keeps the maximum opening degree;
2) when the electric load demand is reduced, the boiler furnace can not ensure stable combustion or heating steam extraction can not meet the heat load demand, opening an inlet valve of a speed-regulating booster pump, starting the speed-regulating booster pump, opening an inlet valve at a low-pressure side and an outlet valve at the low-pressure side, and introducing medium-temperature water heated by a heat supply network heater into a furnace water cooler; the temperature of boiler water entering a boiler bottom header is reduced, partial heat generated by combustion of a hearth is indirectly taken away by heat supply network water, and the heat supply capacity of a unit is improved while stable combustion of a boiler is maintained;
3) when the electric load demand continuously drops or the heat load continuously rises, the rotation speed of the speed-regulating booster pump is increased and the high-pressure side inlet regulating valve is opened, so that the heat exchange quantity of the medium-temperature heat supply network water and the boiler water in the boiler downcomer is increased, the stable combustion in the boiler hearth is maintained, and the heat supply capacity of the unit is improved;
4) when the electric load demand rises or the heat load drops, the heat exchange quantity of the medium-temperature heat supply network water and the boiler water in the boiler downcomer is reduced by reducing the rotating 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 a low-pressure side inlet pressure sensor, a low-pressure side inlet temperature sensor, a low-pressure side outlet pressure sensor, a low-pressure side outlet temperature sensor and a low-pressure side outlet flow sensor, and the parameters are further converted into the coal combustion amount of the boiler and serve as a monitoring object for stable combustion of the boiler.
Further, the arrangement of the recirculation bypass advantageously reduces the difference between the inlet and outlet ends of the furnace water cooler.
Furthermore, in order to prevent the high-temperature heat supply network water at the low-pressure side outlet of the furnace water cooler from vaporizing, the temperature of the high-temperature heat supply network water outlet is controlled by adjusting the opening of the low-pressure side bypass adjusting valve, so that a certain amount of super-cooling degree is kept.
Further, in order to obtain higher temperature heat supply network water without vaporization, the low pressure side high temperature heat supply network water of the furnace water cooler is converged into an outlet pipeline of the heat supply network circulating pump with higher pressure.
Furthermore, when the rotating speed of the speed-regulating booster pump is increased and the high-pressure side inlet regulating valve is opened to be incapable of meeting the requirements of stable combustion or heat supply of the boiler, the heat exchange amount is further improved by closing the high-pressure side bypass regulating valve.
Furthermore, the first regulating means of the heat exchange quantity of the furnace water cooler is a speed-regulating booster pump, the second regulating means is a high-pressure side inlet regulating valve, and the third regulating means is a high-pressure side bypass regulating valve.
Compared with the prior art, the invention has the following advantages and effects: the invention utilizes the heat exchange between the boiler water of the boiler downcomer and the medium temperature heat network water to indirectly convert the heat energy in the hearth into heat supply load to be supplied to the outside, thereby not only ensuring the stable combustion of the boiler and the flue gas denitration efficiency of the unit at low load in the heat supply period, but also improving the heat supply capacity of the unit, effectively solving the problem of outstanding thermoelectric contradiction in the heat supply period of the current northern area and realizing the thermoelectric decoupling operation under the working condition of not increasing the power generation load.
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 heat supply regulation applied to the operation of the unit condensing/cutting cylinder.
In the figure: the boiler comprises a boiler downcomer 1, a furnace bottom header 2, a furnace 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 heat supply network heater 8, a speed-regulating booster pump 9, a low-pressure side inlet pressure sensor 10, a low-pressure side inlet temperature sensor 11, a speed-regulating booster pump inlet valve 12, a low-pressure side inlet valve 13, a heat supply 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 communication valve 20, an intermediate pressure cylinder 21, a low pressure cylinder 22, an intermediate and low pressure communication 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 below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Examples are given.
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 boiler bottom 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 boiler bottom 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 furnace 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 installed on the bypass pipeline of the furnace water cooler 3; a 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 installed 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 by heating and boosting low-temperature heat supply network backwater sequentially 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 installed at the inlet of the speed-regulating booster pump 9, and a low-pressure side inlet valve 13 is installed 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 main pipe, a heat supply network circulating pump 14 and a communication valve 20 are installed on the medium temperature heat supply network water main pipe, a low-pressure side outlet pipeline of the furnace water cooler 3 is converged with the medium temperature heat supply network water main 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 installed on the low-pressure side outlet pipeline of the furnace water cooler 3, the medium temperature heat supply network water is heated into high temperature heat supply network water through the furnace water cooler 3, and the high temperature heat supply network water is converged into the outlet of the heat supply network circulating pump 14 through the low-pressure side outlet pipeline of the furnace water cooler 3 and is mixed into heat supply network water with a certain temperature; 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 thermoelectric decoupling control method comprises the following steps:
1. when entering a heating period, the furnace water cooler 3 is in a hot standby state by opening the high-pressure side inlet valve 4, the high-pressure side inlet regulating valve 5 and the high-pressure side outlet valve 6, and the high-pressure side bypass regulating valve 7 keeps the maximum opening degree;
2. when the electric load demand is reduced, the boiler furnace can not ensure stable combustion or heating steam extraction can not meet the heat load demand, an inlet valve 12 of a speed-regulating booster pump is opened, the speed-regulating booster pump 9 is started, a low-pressure side inlet valve 13 and a low-pressure side outlet valve 15 are opened, and medium-temperature water heated by a heat supply network heater 8 is introduced into a furnace water cooler 3; the temperature of the boiler water entering the boiler bottom header 2 is reduced, partial heat generated by combustion of a hearth is indirectly taken away by heat supply network water, and the heat supply capacity of a unit is improved while stable combustion of the boiler is maintained;
3. when the electric load demand continuously drops or the heat load continuously rises, the heat exchange quantity of the medium-temperature heat supply network water and the boiler water in the boiler downcomer 1 is increased by increasing the rotating 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 a unit is improved while stable combustion in a boiler hearth is maintained;
4. when the electric load demand rises again or the heat load drops, the heat exchange quantity of the medium-temperature heat supply network water and the boiler water in the boiler downcomer 1 is reduced by reducing the rotating 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 this parameter is further converted into the boiler coal combustion amount, which is used as a monitoring target for the stable combustion of the boiler. In order to prevent the high-temperature heat supply network water at the low-pressure side outlet of the furnace water cooler 3 from vaporizing, the temperature of the high-temperature heat supply network water outlet is controlled by adjusting the opening degree of the low-pressure side bypass adjusting valve 19, so that a certain amount of super-cooling degree is kept. When the requirements of stable combustion or heat supply of the boiler cannot be met by increasing the rotating speed of the speed-regulating booster pump 9 and opening the high-pressure side inlet regulating valve 5, the heat exchange amount is further increased by closing the high-pressure side bypass regulating valve 7.
In this embodiment, the first adjusting means of the heat exchange amount of the furnace water cooler 3 is a speed-regulating booster pump 9, the second adjusting means is a high-pressure side inlet adjusting valve 5, and the third adjusting means is a high-pressure side bypass adjusting valve 7.
As shown in fig. 2, the present invention is applied to a cylinder-cutting operation unit, taking a 300MW unit as an example, and entering a heat supply period, 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, so that a furnace water cooler 3 is in a hot standby state; when the unit operates at low load, the low-pressure cylinder 22 is cut off through the middle and low-pressure communicating pipe heat supply butterfly valve 23, the steam discharged by the middle-pressure cylinder 21 enters the heat supply network heater 8, and the power generation load can be reduced to 30% at least when the cylinder is simply cut off to ensure stable combustion of the boiler; if the power generation load needs to be reduced to be below 30% or the heat supply load cannot be met, an inlet valve 12 of the speed-regulating booster pump is opened, the speed-regulating booster pump 9 is started, a low-pressure side inlet valve 13 and a low-pressure side outlet valve 15 are opened, medium-temperature heat supply network water is introduced into the furnace water cooler 3 for heat exchange, the temperature of furnace water is reduced, combustion of a hearth is enhanced, a stable combustion critical area is separated, the power generation load is reduced while the stable combustion is met, and the heat supply load is improved.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (5)
1. A deep peak shaving heating system based on a boiler water cooler is characterized in that the boiler water cooler (3) is connected between a boiler down pipe (1) and a boiler bottom header (2) of a coal-fired boiler, a high-pressure side inlet of the boiler water cooler (3) is connected with the boiler down pipe (1), a high-pressure side outlet of the boiler water cooler (3) is connected with the boiler bottom header (2), a high-pressure side inlet valve (4) and a high-pressure side inlet adjusting 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 installed on the bypass pipeline of the boiler water cooler (3); a 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 installed 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 low-temperature heat supply network backwater is heated and boosted sequentially 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 installed at the inlet of the speed-regulating booster pump (9), and a low-pressure side inlet valve (13) is installed at the outlet of the speed-regulating booster pump (9); an outlet of the heat supply network heater (8) is connected with a medium-temperature heat supply network water main pipe, a heat supply network circulating pump (14) and a communication valve (20) are installed on the medium-temperature heat supply network water main pipe, a low-pressure side outlet pipeline of the furnace water cooler (3) is converged with the medium-temperature heat supply network water main 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 installed on the low-pressure side outlet pipeline of the furnace water cooler (3), medium-temperature heat supply network water is heated into high-temperature heat supply network water through the furnace water cooler (3), and the high-temperature heat supply network water is converged into an outlet of the heat supply network circulating pump (14) through the low-pressure side outlet pipeline of the furnace water cooler (3) and is mixed into heat supply network water with a certain temperature; the speed regulation 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 installed on the recirculation bypass.
2. The thermoelectric decoupling control method of the deep peak shaving heating system based on the furnace water cooler as claimed in claim 1 is characterized by comprising the following processes:
1) when the heating period is started, 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 furnace water cooler (3) is in a hot standby state, and the high-pressure side bypass regulating valve (7) keeps the maximum opening degree;
2) when the electric load demand is reduced, the boiler furnace can not ensure stable combustion or heating steam extraction can not meet the heat load demand, an inlet valve (12) of a speed-regulating booster pump is opened, the speed-regulating booster pump (9) is started, a low-pressure side inlet valve (13) and a low-pressure side outlet valve (15) are opened, and medium-temperature water heated by a heat supply network heater (8) is introduced into a boiler water cooler (3); the temperature of the boiler water entering the boiler bottom header (2) is reduced, partial heat generated by combustion of a hearth is indirectly taken away by heat supply network water, and the heat supply capacity of a unit is improved while stable combustion of the boiler is maintained;
3) when the demand of the electrical load continuously drops or the thermal load continuously rises, the heat exchange quantity of the medium-temperature heat supply network water and the boiler water in the boiler down pipe (1) is increased by increasing the rotating 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 a unit is improved while the stable combustion in a boiler hearth is maintained;
4) when the electric load demand rises again or the heat load drops, the heat exchange quantity of the medium-temperature heat supply network water and the boiler water in the boiler downcomer (1) is reduced by reducing the rotating speed of the speed-regulating booster pump (9) and closing the high-pressure side inlet regulating valve (5).
3. The thermoelectric decoupling control method of the deep peak shaving heating system based on the boiler water cooler as claimed in claim 2, characterized in that the heat exchange power is 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 then further converted into the boiler coal combustion amount as the monitoring object of the boiler steady combustion.
4. The thermoelectric decoupling control method of the deep peak shaving heating system based on the furnace water cooler as claimed in claim 2, characterized in that, in order to prevent the high temperature heat supply network water at the low pressure side outlet of the furnace water cooler (3) from vaporizing, the opening degree of the low pressure side bypass regulating valve (19) is adjusted to control the high temperature heat supply network water outlet temperature so as to keep a certain amount of super-cooling degree.
5. The thermoelectric decoupling control method of the deep peak shaving heat supply system based on the furnace water cooler as claimed in claim 2, characterized in that when the stable combustion or heat supply requirements 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 increased 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 | Deep peak shaving heat supply system based on furnace water cooler and thermal decoupling control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111631471.9A CN114526473B (en) | 2021-12-28 | Deep peak shaving heat supply system based on furnace water cooler and thermal decoupling control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114526473A true CN114526473A (en) | 2022-05-24 |
| CN114526473B CN114526473B (en) | 2024-04-26 |
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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 |
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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