CN111237839A - Nearly zero-energy-consumption heat supply unit total heat recovery system and heat supply control method thereof - Google Patents
Nearly zero-energy-consumption heat supply unit total heat recovery system and heat supply control method thereof Download PDFInfo
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- 238000011084 recovery Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000005265 energy consumption Methods 0.000 title claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 122
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 95
- 239000002002 slurry Substances 0.000 claims description 47
- 238000001816 cooling Methods 0.000 claims description 45
- 238000006477 desulfuration reaction Methods 0.000 claims description 40
- 230000023556 desulfurization Effects 0.000 claims description 40
- 230000001105 regulatory effect Effects 0.000 claims description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 12
- 239000003546 flue gas Substances 0.000 claims description 12
- 230000003009 desulfurizing effect Effects 0.000 claims description 9
- 239000000428 dust Substances 0.000 claims description 9
- 230000001276 controlling effect Effects 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 239000000779 smoke Substances 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
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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
- 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
- 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
- F24D19/1039—Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses a heat pump
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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
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/18—Hot-water central heating systems using heat pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D31/00—Other cooling or freezing apparatus
- F25D31/002—Liquid coolers, e.g. beverage cooler
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- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Treating Waste Gases (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention provides a near-zero energy consumption heat supply unit total heat recovery system and a heat supply control method thereof. The system greatly improves the heat transfer capacity of the original heat supply network system by reducing the temperature of the return water of the primary network in the original heat supply network system and enlarging the temperature difference of the supply return water of the primary network, so that the investment and the operating cost of the heat supply network system are reduced to the maximum extent under the condition of meeting the heating requirement of a newly-added heat supply network system; by utilizing the heat supply control method provided by the invention, the heat supply of the new heat supply network system is more energy-saving and efficient.
Description
Technical Field
The invention relates to a near-zero energy consumption heat supply unit total heat recovery system and a heat supply control method thereof.
Background
At present, more than 90% of coal-fired industrial boiler desulfurization facilities in China adopt a limestone-gypsum wet desulfurization process, the desulfurization process generally adopts a spray washing technology to remove sulfur dioxide in flue gas, meanwhile, a large amount of water is gasified and then enters the flue gas, the temperature of the flue gas is reduced to about 50 ℃ and is discharged into the atmosphere through a chimney in a saturated state, a 'wet smoke plume' (commonly called 'big white smoke', 'white fog' and the like) is easily formed at the outlet of the chimney, the 'wet smoke plume' easily causes local atmospheric environmental pollution, meanwhile, a large amount of boiler flue gas is finally reduced to about 50 ℃ from 150-200 ℃ at the inlet of a desulfurization tower and is discharged from a desulfurization system, the method not only wastes a large amount of water, but also takes away a large amount of latent heat of vaporization.
A central heating system (as shown in figure 1) of a thermal power plant in northern China generally adopts a circulating water conveying form of a primary network and a secondary network, the temperature difference of supply and return water of a primary network low-temperature water heating system is generally 20-40 ℃, the temperature difference of return water of the primary network is generally 40-60 ℃, and the temperature difference of supply and return water is small, so that the transmission and distribution capacity of a heat network is small, the quantity of end heat users is increased rapidly along with the increase of urbanization speed and the improvement of the living standard of people, the existing central heating system cannot meet the requirement of newly increased heating, the heating capacity of the heat network system is improved for meeting the requirement of newly increased heating, the central heating system can be realized by modifying the heat network, but the investment cost of modifying the heat network is higher, the influence on the production and.
Disclosure of Invention
The invention aims to provide a total heat recovery system of a heat supply unit with nearly zero energy consumption, which greatly improves the heat delivery capacity of an original heat network system by reducing the temperature of return water of a primary network in the original heat network system and enlarging the temperature difference of supply and return water of the primary network, so that the investment and the operating cost of the heat network system are reduced to the maximum extent under the condition of meeting the heating requirement of a newly-added heat network system, the heat delivery capacity of the system is improved, and simultaneously, the low-temperature high-humidity flue gas elimination and the heat recovery on the heat source side are realized, thereby realizing the total heat recovery of the whole heat supply system as a whole; by utilizing the heat supply control method provided by the invention, the heat supply of the new heat supply network system is more energy-saving and efficient.
The technical scheme adopted by the invention for solving the technical problems is as follows: the heat supply unit total heat recovery system with nearly zero energy consumption comprises a heat source system, a heat supply network system and a central heat supply control system, wherein the heat source system comprises a boiler, a dust remover, an induced draft fan, a desulfurizing tower, a chimney and a steam turbine, the boiler, the dust remover, the induced draft fan, the desulfurizing tower and the chimney are sequentially connected in series through flue gas pipelines, the steam inlet end of the steam turbine is connected with the steam outlet end of the boiler through a first steam pipeline, the heat supply network system comprises a primary heat supply network system, the primary heat supply network system comprises a heat supply network heater, a primary heating user end, a first plate heat exchanger and a heat supply network circulating pump, the steam outlet end of the steam turbine is connected with the heat supply network heater through a second steam pipeline, an eighteenth control valve is connected on the second steam pipeline in series, the central heat supply control system can control the running of the eighteenth control valve, and the outlet of the heat supply network heater is connected with the high-temperature water inlet The high-temperature water outlet of the first plate heat exchanger is connected with the inlet of the heat supply network circulating pump through a second pipeline, the outlet of the heat supply network circulating pump is connected with the inlet of the heat supply network heater through a third pipeline, the first plate heat exchanger continuously supplies heat to an original heating user side, a desulfurization slurry heat exchanger is connected in series on the third pipeline, the high-temperature water inlet of the desulfurization slurry heat exchanger is connected with the slurry outlet of the desulfurization tower through a first slurry pipeline, the high-temperature water outlet of the desulfurization slurry heat exchanger is connected with the spraying device in the desulfurization tower through a second slurry pipeline, a slurry circulating pump is connected in series on the first slurry pipeline, a second control valve is connected in series on the second pipeline, the heat supply network system further comprises a new heat supply network system, and the new heat network system comprises a second plate heat exchanger, a heat pump heat supply unit, a heat pump, the central heating control system can enable the new heat supply network system to enter a working mode that the second plate heat exchanger and the heat pump heat supply unit supply heat to the new heating user side together or the heat pump heat supply unit supplies heat to the new heating user side independently by controlling the operation modes of the second control valve and the new heat supply network heat supply control pipeline.
Preferably, the new heat supply network heat supply control pipeline includes a fourth pipeline, a fifth pipeline, a sixth pipeline, a seventh pipeline, an eighth pipeline, a ninth pipeline, a tenth pipeline, an eleventh pipeline, a twelfth pipeline, a thirteenth pipeline, a fourteenth pipeline, a fifteenth pipeline, a sixteenth pipeline, a seventeenth pipeline, a fourth control valve, a fifth control valve, a sixth control valve, a seventh control valve, an eighth control valve, a ninth control valve, a tenth control valve, an eleventh control valve, a twelfth control valve, a thirteenth control valve, and a fourteenth control valve, a connection point of the fourth pipeline and the second pipeline is located between the first plate heat exchanger and the second control valve, a high-temperature water inlet and a high-temperature water outlet of the second plate heat exchanger are communicated with the fourth pipeline through the sixth pipeline and the seventh pipeline respectively, and the sixth control valve located between the sixth pipeline and the seventh pipeline is connected in series on the fourth pipeline, the sixth pipeline is connected in series with the fourth control valve, the seventh pipeline is connected in series with the fifth control valve, the high-temperature water inlet and the high-temperature water outlet of the evaporator are communicated with the fourth pipeline through the eighth pipeline and the ninth pipeline respectively, the fourth pipeline is connected in series with a ninth control valve between the eighth pipeline and the ninth pipeline, the eighth pipeline is connected in series with the seventh control valve, the ninth pipeline is connected in series with an eighth control valve, the tail end of the fourth pipeline is communicated with the second pipeline through the fifth pipeline, the fifth pipeline is connected in series with the tenth control valve, the low-temperature water inlet and the low-temperature water outlet of the evaporator are connected with the high-temperature water outlet and the high-temperature water inlet of the condenser through the eleventh pipeline and the tenth pipeline respectively, and the compressor is connected in series with the tenth pipeline, the throttling valve is connected in series with the eleventh pipeline, the fourteenth pipeline and the seventeenth pipeline are respectively arranged on a low-temperature water inlet and a low-temperature water outlet of the condenser, the thirteenth pipeline and the sixteenth pipeline are respectively arranged on a low-temperature water inlet and a low-temperature water outlet of the second plate heat exchanger, the fifteenth pipeline is arranged on a hot water inlet of the new heating user side, the twelfth pipeline is arranged on a hot water outlet of the new heating user side, the fourteenth pipeline and the thirteenth pipeline are communicated with the twelfth pipeline in a parallel connection mode, the seventeenth pipeline and the sixteenth pipeline are communicated with the fifteenth pipeline in a parallel connection mode, and an eleventh control valve, a fourteenth control valve and a fourteenth control valve are sequentially connected in series with the seventeenth pipeline, the sixteenth pipeline, the fifteenth pipeline and the twelfth pipeline, A twelfth control valve and a thirteenth control valve, the central heating control system may control operations of the compressor, the fourth control valve, the fifth control valve, the sixth control valve, the seventh control valve, the eighth control valve, the ninth control valve, the tenth control valve, the eleventh control valve, the twelfth control valve, the thirteenth control valve and the fourteenth control valve.
Furthermore, the ninth control valve is an automatic regulating valve, and a first electric regulating valve and a second electric regulating valve are respectively connected in series on the thirteenth pipeline and the fourteenth pipeline.
Furthermore, an eighteenth pipeline is connected between the low-temperature water outlet of the second plate heat exchanger and the low-temperature water inlet of the condenser in series, a seventeenth control valve is connected on the eighteenth pipeline in series, and the seventeenth control valve is connected with the central heat supply control system.
Furthermore, a first control valve positioned between the heat supply network heater and the desulfurization slurry heat exchanger is connected in series on the third pipeline, a third control valve positioned between the second control valve and the heat supply network circulating pump is connected in series on the second pipeline, the total heat recovery system also comprises a cooling device, the water inlet end of the cooling device is connected with the third pipeline through a nineteenth pipeline, the water outlet end of the cooling device is connected with the second pipeline through a twentieth pipeline, the connection position of the nineteenth pipeline and the third pipeline is positioned between the first control valve and the desulfurization slurry heat exchanger, the connection position of the twentieth pipeline and the second pipeline is positioned between the third control valve and the heat supply network circulating pump, a fifteenth control valve is connected in series on the nineteenth pipeline, and a sixteenth control valve is connected in series on the twentieth pipeline, the central heating control system can control the operation of the first control valve, the third control valve, the fifteenth control valve, the sixteenth control valve and the cooling device.
Further, the desulfurization slurry heat exchanger is a full-welded wide-channel plate heat exchanger or a shell-and-tube heat exchanger or a heat-pipe heat exchanger.
The invention also provides a heat supply control method of the nearly zero energy consumption heat supply unit total heat recovery system, which comprises the following steps:
s1, starting a central heating control system, wherein the central heating control system enables each electric appliance element in the heating network system to be in a standby state;
s2, the central heating control system judges whether the system enters a heating working mode or a cooling working mode of the cooling device alone according to the comparison result of the real-time date and the heating time period set in the system;
s2.1, when the real-time date is not within the heating time period set in the system, enabling the system to enter a cooling device independent cooling working mode by the central heating control system, and cooling the high-temperature desulfurization slurry by using the cooling device and the desulfurization slurry heat exchanger in the cooling device independent cooling working mode;
s2.2, when the real-time date is within the heating time period set in the system, the central heating control system enables the system to enter a heating working mode, and in the heating working mode, the system continuously performs normal heating of the original heating network system and the new heating network system.
Further, in the heat supply working mode, when the return water temperature in the second pipeline is greater than or equal to 42 ℃, the central heat supply control system enables the new heat supply network system to enter a working mode that the second plate heat exchanger and the heat pump heat supply unit supply heat to a new heating user side together, and when the return water temperature in the second pipeline is less than 42 ℃, the central heat supply control system enables the new heat supply network system to enter a working mode that the heat pump heat supply unit supplies heat to the new heating user side alone.
Further, when the new heat supply network system is in a working mode that the second plate heat exchanger and the heat pump heat supply unit supply heat to the new heating user side together, when the return water temperature in the second pipeline is greater than or equal to 47 ℃, the central heat supply control system enables the new heat supply network system to enter a working mode that the second plate heat exchanger and the heat pump heat supply unit are connected in parallel to supply heat to the new heating user side, and when the return water temperature in the second pipeline is less than 47 ℃, the central heat supply control system enables the new heat supply network system to enter a working mode that the second plate heat exchanger and the heat pump heat supply unit are connected in series to supply heat to the new heating user side.
The invention has the beneficial effects that: the second plate heat exchanger and the heat pump heat supply unit of the system fully absorb the return water waste heat of the primary net in the original heat net system, so that the return water temperature of the primary net is greatly reduced, the operation of the heat pump heat supply unit further enlarges the return water supply temperature difference of the primary net, the heat transfer capacity of the original heat net system is greatly improved, and the investment and the operation cost of the heat net system are reduced to the maximum extent under the condition of meeting the heating requirement of a newly-added heat net system; the flue gas waste heat is recovered through the heat exchange effect of the desulfurization slurry heat exchanger, so that the total heat recovery of the heat supply unit is realized on the whole, the flue gas whitening effect is also achieved while the flue gas waste heat recovery is realized, the environmental pollution capacity of the heat supply unit is reduced, and then the dual zero emission of energy and pollutants is achieved; by utilizing the heat supply control method provided by the invention, the heat supply of the new heat supply network system is more energy-saving and efficient.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are part of the preferred embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a combined framework of a heat source system and a raw heat grid system;
FIG. 2 is a block diagram of a heating system according to the present invention;
FIG. 3 is a flow chart of a heating control method provided by the present invention;
in the figure: 1 boiler, 2 dust collectors, 3 induced draft fans, 4 desulfurizing towers, 5 slurry circulating pumps, 51 first slurry pipelines, 52 second slurry pipelines, 6 chimneys, 7 steam turbines, 71 first steam pipelines, 72 second steam pipelines, 8 heat net heaters, 9 first plate heat exchangers, 10 heat net circulating pumps, 11 original heating user sides, 12 desulfurizing slurry heat exchangers, 13 second plate heat exchangers, 14 new heating user sides, 15 compressors, 16 condensers, 17 throttling valves, 18 evaporators, 19 cooling devices, 101 first pipelines, 102 second pipelines, 103 third pipelines, 104 fourth pipelines, 105 fifth pipelines, 106 sixth pipelines, 107 seventh pipelines, 108 eighth pipelines, 109 ninth pipelines, 110 tenth pipelines, 111 eleventh pipelines, 112 twelfth pipelines, 113 thirteenth pipelines, 114 fourteenth pipelines, 115 fifteenth pipelines, 116 sixteenth pipelines, 117 seventeenth pipelines, 118 eighteenth pipeline, 119 nineteenth pipeline, 120 twentieth pipeline, 201 first control valve, 202 second control valve, 203 third control valve, 204 fourth control valve, 205 fifth control valve, 206 sixth control valve, 207 seventh control valve, 208 eighth control valve, 209 ninth control valve, 210 tenth control valve, 211 eleventh control valve, 212 twelfth control valve, 213 thirteenth control valve, 214 fourteenth control valve, 215 fifteenth control valve, 216 sixteenth control valve, 217 seventeenth control valve, 218 eighteenth control valve, 301 first electric control valve, 302 second electric control valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the specific embodiments and accompanying drawings 1-3, and it is obvious that the described embodiments are only a part of the preferred embodiments of the present invention, and not all embodiments. Those skilled in the art can make similar modifications without departing from the spirit of the invention, and therefore the invention is not limited to the specific embodiments disclosed below.
The invention provides a nearly zero energy consumption heat supply unit total heat recovery system (as shown in figure 2), which comprises a heat source system, a heat supply network system and a central heat supply control system, wherein the heat source system comprises a boiler 1, a dust remover 2, an induced draft fan 3, a desulfurizing tower 4, a chimney 6 and a steam turbine 7, the boiler 1, the dust remover 2, the induced draft fan 3, the desulfurizing tower 4 and the chimney 6 are sequentially connected in series through flue gas pipelines, high-temperature flue gas discharged in the combustion process of the boiler 1 is discharged into the atmosphere through the chimney 6 after being subjected to dust removal of the dust remover 2 and desulfurization of the desulfurizing tower 4, the steam inlet end of the steam turbine 7 is connected with the steam outlet end of the boiler 1 through a first steam pipeline 71, the heat supply network system comprises an original heat supply network system and a new heat supply network system, the original heat supply network system comprises a heat supply network heater 8, an original heating user end 11, a first plate heat exchanger 9 and a heat supply network, the steam outlet end of the steam turbine 7 is connected with the heat supply network heater 8 through a second steam pipeline 72, an eighteenth control valve 218 is connected in series on the second steam pipeline 72, the central heat supply control system can control the operation of the eighteenth control valve 218, the outlet of the heat supply network heater 8 is connected with the high-temperature water inlet of the first plate heat exchanger 9 through a first pipeline 101, the high-temperature water outlet of the first plate heat exchanger 9 is connected with the inlet of the heat supply network circulating pump 10 through a second pipeline 102, the outlet of the heat supply network circulating pump 10 is connected with the inlet of the heat supply network heater 8 through a third pipeline 103, the steam flowing out of the steam turbine 7 realizes the water supply and heating in the first pipeline 101 through the heat supply network heater 8, the first plate heat exchanger 9 continuously supplies heat to the original heating user terminal 11, and a slurry desulfurization heat exchanger 12 is connected in series on the third pipeline 103, in this embodiment, the desulfurization slurry heat exchanger 12 is a full-welded wide-channel plate heat exchanger or a shell-and-tube heat exchanger or a heat-pipe heat exchanger, a high-temperature water inlet of the desulfurization slurry heat exchanger 12 is connected with a slurry outlet of the desulfurization tower 4 through a first slurry pipeline 51, a high-temperature water outlet of the desulfurization slurry heat exchanger 12 is connected with a spray device in the desulfurization tower 4 through a second slurry pipeline 52, a slurry circulating pump 5 is connected in series with the first slurry pipeline 51, a second control valve 202 is connected in series with the second pipeline 102, the new heat network system includes a second plate heat exchanger 13, a heat pump heat supply unit, a new heat network heat supply pipeline and a new heating user end 14, the heat pump heat supply unit includes a compressor 15, a condenser 16, a throttle valve 17 and an evaporator 18, the central heat supply control system controls the operation mode of the second control valve 202 and the new heat network heat supply control pipeline, the new heat supply network system can enter a working mode that the second plate heat exchanger and the heat pump heat supply unit supply heat to a new heating user side together or a working mode that the heat pump heat supply unit supplies heat to the new heating user side independently.
In this embodiment, the new heat supply network heat supply control pipeline is implemented as follows: the new heat supply network heating control pipeline comprises a fourth pipeline 104, a fifth pipeline 105, a sixth pipeline 106, a seventh pipeline 107, an eighth pipeline 108, a ninth pipeline 109, a tenth pipeline 110, an eleventh pipeline 111, a twelfth pipeline 112, a thirteenth pipeline 113, a fourteenth pipeline 114, a fifteenth pipeline 115, a sixteenth pipeline 116, a seventeenth pipeline 117, a fourth control valve 204, a fifth control valve 205, a sixth control valve 206, a seventh control valve 207, an eighth control valve 208, a ninth control valve 209, a tenth control valve 210, an eleventh control valve 211, a twelfth control valve 212, a thirteenth control valve 213 and a fourteenth control valve 214, the connection position of the fourth pipeline 104 and the second pipeline 102 is located between the first plate heat exchanger 9 and the second control valve 202, the high-temperature water inlet and the high-temperature water outlet of the second plate heat exchanger 13 are communicated with the fourth pipeline 104 through the sixth pipeline 106 and the seventh pipeline 107 respectively, a sixth control valve 206 is connected in series to the fourth pipe 104 between the sixth pipe 106 and the seventh pipe 107, a fourth control valve 204 is connected in series to the sixth pipe 106, a fifth control valve 205 is connected in series to the seventh pipe 107, the high-temperature water inlet and the high-temperature water outlet of the evaporator 18 are communicated with the fourth pipe 104 through the eighth pipe 108 and the ninth pipe 109, respectively, the connection point of the eighth pipe 108 and the fourth pipe 104 is located downstream of the connection point of the seventh pipe 107 and the fourth pipe 104, a ninth control valve 209 is connected in series to the fourth pipe 104 between the eighth pipe 108 and the ninth pipe 109, a seventh control valve 207 is connected in series to the eighth pipe 108, an eighth control valve 208 is connected in series to the ninth pipe 109, and the end of the fourth pipe 104 is communicated with the second pipe 102 through the fifth pipe 105, the tenth control valve 210 is connected in series to the fifth pipeline 105, the low-temperature water inlet and the low-temperature water outlet of the evaporator 18 are connected to the high-temperature water outlet and the high-temperature water inlet of the condenser 16 through an eleventh pipeline 111 and a tenth pipeline 110, respectively, the compressor 15 is connected in series to the tenth pipeline 110, the throttle valve 17 is connected in series to the eleventh pipeline 111, the fourteenth pipeline 114 and the seventeenth pipeline 117 are provided at the low-temperature water inlet and the low-temperature water outlet of the condenser 16, the thirteenth pipeline 113 and the sixteenth pipeline 116 are provided at the low-temperature water inlet and the low-temperature water outlet of the second plate heat exchanger 13, respectively, the fifteenth pipeline 115 is provided at the hot water inlet of the new heating user side, the twelfth pipeline 112 is provided at the hot water outlet of the new heating user side, and the fourteenth pipeline 114 and the thirteenth pipeline 113 are connected in parallel to the twelfth pipeline 112, the seventeenth pipeline 117 and the sixteenth pipeline 116 are connected in parallel to the fifteenth pipeline 115, an eleventh control valve 211, a fourteenth control valve 214, a twelfth control valve 212 and a thirteenth control valve 213 are sequentially connected in series to the seventeenth pipeline 117, the sixteenth pipeline 116, the fifteenth pipeline 115 and the twelfth pipeline 112, the central heating control system can control the operation of the compressor 15, the fourth control valve 204, the fifth control valve 205, the sixth control valve 206, the seventh control valve 207, the eighth control valve 208, the ninth control valve 209, the tenth control valve 210, the eleventh control valve 211, the twelfth control valve 212, the thirteenth control valve 213 and the fourteenth control valve 214, and further, in the heating process of the new heat network system, in order to achieve the operation of the heat pump unit in the optimal cop state and to achieve the automatic flow adjustment of the second plate heat exchanger 13 and the condenser 16 according to the heating temperature, here, the second ninth control valve 209 may be an automatic regulating valve, a first electric regulating valve 301 and a second electric regulating valve 302 are respectively connected in series to the thirteenth pipeline 213 and the fourteenth pipeline 214, the opening degree of the ninth control valve 209 is controlled by a central heating control system, so that the inlet water temperature of the evaporator 18 can be regulated, the inlet water temperature of the evaporator 18 is in the optimal operating temperature range of the heat pump heating unit, the central heating control system regulates the flow rates of the second plate heat exchanger 13 and the condenser 16 by controlling the opening degrees of the first electric regulating valve 301 and the second electric regulating valve 302, further, to realize the series heating of the second plate heat exchanger 13 and the condenser 16, an eighteenth pipeline 118 is connected in series between the low-temperature water outlet of the second plate heat exchanger 13 and the low-temperature water inlet of the condenser 16, a seventeenth control valve 217 is connected in series to the eighteenth pipeline 118, and the seventeenth control valve 217 is connected to the central heating control system.
In order to facilitate the desulfurization slurry heat exchanger 12 to continuously cool the desulfurization slurry in the desulfurization tower in the summer non-heating season, a first control valve 201 is connected in series with the third pipeline 103 between the heat supply network heater 8 and the desulfurization slurry heat exchanger, a third control valve 203 is connected in series with the second pipeline 10 between the second control valve 202 and the heat supply network circulating pump 10, the total heat recovery system further comprises a cooling device 19, the cooling device 19 can be a cooling tower of a conventional air-conditioning cooling system, the water inlet end of the cooling device 19 is connected with the third pipeline 103 through a nineteenth pipeline 119, the water outlet end of the cooling device 19 is connected with the second pipeline 102 through a twentieth pipeline 120, and the connection position of the nineteenth pipeline 119 and the third pipeline 103 is located between the first control valve 201 and the desulfurization slurry heat exchanger 12, the connection between the twentieth pipe 120 and the second pipe 102 is located between the third control valve 203 and the heat network circulation pump 10, a fifteenth control valve 215 is connected in series to the nineteenth pipe 119, a sixteenth control valve 216 is connected in series to the twentieth pipe 120, and the central heating control system can control the operations of the first control valve 201, the third control valve 203, the fifteenth control valve 215, the sixteenth control valve 216 and the cooling device 19.
The invention also provides a heat supply control method of the nearly zero energy consumption heat supply unit total heat recovery system, which comprises the following steps:
s1, starting a central heating control system, wherein the central heating control system enables each electric appliance element in the heating network system to be in a standby state;
s2, the central heating control system judges whether the system enters a heating working mode or a cooling device independent cooling working mode according to the comparison result of the real-time date and the heating time period (the heating time period can be designed to be from fifteen novembers to twenty marches every year in Shandong);
s2.1, when the real-time date is not within the heating time period set in the system, enabling the system to enter a cooling device independent cooling working mode by the central heating control system, and cooling the high-temperature desulfurization slurry by using a cooling device 19 and a desulfurization slurry heat exchanger 12 in the cooling device independent cooling working mode; in the cooling device only cooling operation mode, the cooling device 19, the heat supply network circulation pump 10, the slurry circulation pump 5, the fifteenth control valve 215, and the sixteenth control valve 216 are in an operating state, and the electronic control valves thereof are in a closed state.
S2.2, when the real-time date is within the heating time period set in the system, the central heating control system enables the system to enter a heating working mode, in the heating working mode, the system continuously heats the original heat supply network system and the new heat supply network system normally, and when the original heat supply network system heats the heat normally, the first electric control valve 201, the eighteenth electric control valve 218 and the heat supply network circulating pump 10 are in a normal running state. In the normal heating of the new heat supply network system, when the return water temperature in the second pipeline 102 is higher than or equal to 42 ℃, the central heat supply control system enables the new heat supply network system to enter a new heating user side heating working mode in which the second plate heat exchanger and the heat pump heat supply unit share the same direction, when the new heat supply network system is in the new heating user side heating working mode in which the second plate heat exchanger and the heat pump heat supply unit share the same direction, and when the return water temperature in the second pipeline 102 is higher than or equal to 47 ℃, the central heat supply control system enables the new heat supply network system to enter a new heating user side heating working mode in which the second plate heat exchanger and the heat pump heat supply unit are connected in parallel, and in the new heating user side heating working mode in which the second plate heat exchanger and the heat pump heat supply unit are connected in parallel, the second electric control valve 202, the seventeenth electric control valve 217, the fifteenth control valve 215, the sixteenth electric control valve 216 and, the heat supply network circulating pump 10 and the rest of the electric control valves are in an operating state, when the return water temperature in the second pipeline 102 is lower than 47 ℃, the central heat supply control system enables the new heat supply network system to enter a working mode that the second plate heat exchanger and the heat pump heat supply unit are connected in series to supply heat to a new heating user side, in the working mode that the second plate heat exchanger and the heat pump heat supply unit are connected in series to supply heat to the new heating user side, the second electric control valve 202, the seventeenth electric control valve 217, the fifteenth control valve 215, the sixteenth electric control valve 216, the second electric regulating valve 302, the fourteenth electric control valve 214 and the cooling device 19 are in a closed state, and the heat supply network circulating pump 10 and the rest of the electric control valves.
When the return water temperature in the second pipeline 102 is less than 42 ℃, the central heating control system enables the new heat supply network system to enter a working mode that the heat pump heat supply unit independently supplies heat to a new heating user side, and in the working mode that the heat pump heat supply unit independently supplies heat to the new heating user side, the twelfth electric control valve 212, the thirteenth electric control valve 213, the second electric control valve 302, the eleventh control valve 211, the sixth control valve 206, the seventh control valve 207, the ninth control valve 209, the eighth control valve 208, the tenth control valve 210, the third control valve 203 and the heat supply network circulating pump 10 are in an operating state, and the cooling device 19 and the other electric control valves are in a closed state.
In addition to the technical features described in the specification, the technology is known to those skilled in the art.
While the preferred embodiments and examples of the present invention have been described in detail, it will be apparent to those skilled in the art that the invention is not limited thereto, and that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. A nearly zero energy consumption heat supply unit total heat recovery system comprises a heat source system, a heat supply network system and a central heat supply control system, wherein the heat source system comprises a boiler, a dust remover, an induced draft fan, a desulfurizing tower, a chimney and a steam turbine, the boiler, the dust remover, the induced draft fan, the desulfurizing tower and the chimney are sequentially connected in series through flue gas pipelines, the steam inlet end of the steam turbine is connected with the steam outlet end of the boiler through a first steam pipeline, the heat supply network system comprises a primary heat supply network system, the primary heat supply network system comprises a heat supply network heater, a primary heating user end, a first plate heat exchanger and a heat supply network circulating pump, the steam outlet end of the steam turbine is connected with the heat supply network heater through a second steam pipeline, an eighteenth control valve is connected on the second steam pipeline in series, and the central heat supply control system can control the operation of the eighteenth, the outlet of the heat supply network heater is connected with the high-temperature water inlet of the first plate heat exchanger through a first pipeline, the high-temperature water outlet of the first plate heat exchanger is connected with the inlet of the heat supply network circulating pump through a second pipeline, the outlet of the heat supply network circulating pump is connected with the inlet of the heat supply network heater through a third pipeline, the first plate heat exchanger continuously supplies heat to an original heating user end, and the heat supply network heater is characterized in that a desulfurization slurry heat exchanger is connected on the third pipeline in series, the high-temperature water inlet of the desulfurization slurry heat exchanger is connected with the slurry outlet of the desulfurization tower through a first slurry pipeline, the high-temperature water outlet of the desulfurization slurry heat exchanger is connected with the spray device in the desulfurization tower through a second slurry pipeline, a slurry circulating pump is connected on the first slurry pipeline in series, and a second control valve is connected on the second pipeline in series, the heat supply network system further comprises a new heat supply network system, the new heat supply network system comprises a second plate heat exchanger, a heat pump heat supply unit, a new heat supply network heat supply control pipeline and a new heating user side, the heat pump heat supply unit comprises a compressor, a condenser, a throttle valve and an evaporator, and the central heat supply control system can enable the new heat supply network system to enter a new heating user side heat supply working mode in which the second plate heat exchanger and the heat pump heat supply unit share the same direction or a new heating user side heat supply working mode in which the heat pump heat supply unit independently supplies heat to the new heating user side through controlling the operation modes of the second control valve and the new heat supply network heat supply control pipeline.
2. The total heat recovery system of a heat supply unit with near zero energy consumption as claimed in claim 1, wherein the new heat supply network heat supply control pipeline comprises a fourth pipeline, a fifth pipeline, a sixth pipeline, a seventh pipeline, an eighth pipeline, a ninth pipeline, a tenth pipeline, an eleventh pipeline, a twelfth pipeline, a thirteenth pipeline, a fourteenth pipeline, a fifteenth pipeline, a sixteenth pipeline, a seventeenth pipeline, a fourth control valve, a fifth control valve, a sixth control valve, a seventh control valve, an eighth control valve, a ninth control valve, a tenth control valve, an eleventh control valve, a twelfth control valve, a thirteenth control valve and a fourteenth control valve, the connection between the fourth pipeline and the second pipeline is located between the first plate heat exchanger and the second control valve, and the high temperature water inlet and the high temperature water outlet of the second plate heat exchanger are communicated with the fourth pipeline through the sixth pipeline and the seventh pipeline respectively, a sixth control valve is connected in series with the fourth pipeline between the sixth pipeline and the seventh pipeline, the sixth control valve is connected in series with the sixth pipeline, the fifth control valve is connected in series with the seventh pipeline, a high-temperature water inlet and a high-temperature water outlet of the evaporator are communicated with the fourth pipeline through the eighth pipeline and the ninth pipeline respectively, a ninth control valve is connected in series with the fourth pipeline between the eighth pipeline and the ninth pipeline, the seventh control valve is connected in series with the eighth pipeline, an eighth control valve is connected in series with the ninth pipeline, the tail end of the fourth pipeline is communicated with the second pipeline through the fifth pipeline, a tenth control valve is connected in series with the fifth pipeline, and a low-temperature water inlet and a low-temperature water outlet of the evaporator are connected with a high-temperature water outlet and a high-temperature water inlet of the condenser through the eleventh pipeline and the tenth pipeline respectively, the compressor is connected in series to the tenth pipeline, the throttle valve is connected in series to the eleventh pipeline, the fourteenth pipeline and the seventeenth pipeline are respectively arranged on the low-temperature water inlet and the low-temperature water outlet of the condenser, the thirteenth pipeline and the sixteenth pipeline are respectively arranged on the low-temperature water inlet and the low-temperature water outlet of the second plate heat exchanger, the fifteenth pipeline is arranged on the hot water inlet of the new heating user side, the twelfth pipeline is arranged on the hot water outlet of the new heating user side, the fourteenth pipeline and the thirteenth pipeline are communicated with the twelfth pipeline in a parallel connection manner, the seventeenth pipeline and the sixteenth pipeline are communicated with the fifteenth pipeline in a parallel connection manner, and an eleventh control valve are sequentially connected in series to the seventeenth pipeline, the sixteenth pipeline, the fifteenth pipeline and the twelfth pipeline, A fourteenth control valve, a twelfth control valve and a thirteenth control valve, the central heating control system may control operations of the compressor, the fourth control valve, the fifth control valve, the sixth control valve, the seventh control valve, the eighth control valve, the ninth control valve, the tenth control valve, the eleventh control valve, the twelfth control valve, the thirteenth control valve and the fourteenth control valve.
3. The system as claimed in claim 2, wherein the ninth control valve is an automatic regulating valve, and a first electric regulating valve and a second electric regulating valve are respectively connected in series to the thirteenth pipeline and the fourteenth pipeline.
4. The system as claimed in claim 3, wherein an eighteenth pipeline is connected in series between the low-temperature water outlet of the second plate heat exchanger and the low-temperature water inlet of the condenser, and a seventeenth control valve is connected in series on the eighteenth pipeline and connected to the central heating control system.
5. The system as claimed in claim 4, wherein a first control valve is connected in series with the third pipeline between the heat supply network heater and the desulfurization slurry heat exchanger, a third control valve is connected in series with the second pipeline between the second control valve and the heat supply network circulating pump, the system further comprises a cooling device, the water inlet end of the cooling device is connected with the third pipeline through a nineteenth pipeline, the water outlet end of the cooling device is connected with the second pipeline through a twentieth pipeline, the connection point of the nineteenth pipeline and the third pipeline is located between the first control valve and the desulfurization slurry heat exchanger, the connection point of the twentieth pipeline and the second pipeline is located between the third control valve and the heat supply network circulating pump, and a fifteenth control valve is connected in series with the nineteenth pipeline, and a sixteenth control valve is connected on the twentieth pipeline in series, and the central heating control system can control the operation of the first control valve, the third control valve, the fifteenth control valve, the sixteenth control valve and the cooling device.
6. The system of claim 5, wherein the desulfurization slurry heat exchanger is a full-welded wide-channel plate heat exchanger or a shell-and-tube heat exchanger or a heat-pipe heat exchanger.
7. A heating control method of the total heat recovery system of the heating unit with near zero energy consumption according to claim 6, which is characterized by comprising the following steps:
s1, starting a central heating control system, wherein the central heating control system enables each electric appliance element in the heating network system to be in a standby state;
s2, the central heating control system judges whether the system enters a heating working mode or a cooling working mode of the cooling device alone according to the comparison result of the real-time date and the heating time period set in the system;
s2.1, when the real-time date is not within the heating time period set in the system, enabling the system to enter a cooling device independent cooling working mode by the central heating control system, and cooling the high-temperature desulfurization slurry by using the cooling device and the desulfurization slurry heat exchanger in the cooling device independent cooling working mode;
s2.2, when the real-time date is within the heating time period set in the system, the central heating control system enables the system to enter a heating working mode, and in the heating working mode, the system continuously performs normal heating of the original heating network system and the new heating network system.
8. The heat supply control method of the heat supply unit total heat recovery system with near zero energy consumption of claim 7, wherein in the heat supply operation mode, when the temperature of the return water in the second pipeline is higher than or equal to 42 ℃, the central heat supply control system enables the new heat supply network system to enter the heat supply operation mode that the second plate heat exchanger and the heat pump heat supply unit supply heat to the new heating user side together, and when the temperature of the return water in the second pipeline is lower than 42 ℃, the central heat supply control system enables the new heat supply network system to enter the heat pump heat supply unit to supply heat to the new heating user side alone.
9. The heat supply control method of the heat supply unit total heat recovery system with near zero energy consumption of claim 8, wherein when the new heat supply network system is in the operation mode that the second plate heat exchanger and the heat pump heat supply unit are used for supplying heat to the new heating user side together, when the temperature of the return water in the second pipeline is higher than or equal to 47 ℃, the central heat supply control system enables the new heat supply network system to enter the operation mode that the second plate heat exchanger and the heat pump heat supply unit are connected in parallel for supplying heat to the new heating user side, and when the temperature of the return water in the second pipeline is lower than 47 ℃, the central heat supply control system enables the new heat supply network system to enter the operation mode that the second plate heat exchanger and the heat pump heat supply unit are connected in series for supplying heat to the new heating user side.
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Cited By (1)
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| CN113090541A (en) * | 2021-04-08 | 2021-07-09 | 西安热工研究院有限公司 | Indirect air cooling unit slurry circulating pump system based on double-fed system |
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