CN117029082A - Heat supply system for heat storage in seasons and control method - Google Patents
Heat supply system for heat storage in seasons and control method Download PDFInfo
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- CN117029082A CN117029082A CN202310912750.5A CN202310912750A CN117029082A CN 117029082 A CN117029082 A CN 117029082A CN 202310912750 A CN202310912750 A CN 202310912750A CN 117029082 A CN117029082 A CN 117029082A
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- 238000005338 heat storage Methods 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000002028 Biomass Substances 0.000 claims abstract description 43
- 239000002440 industrial waste Substances 0.000 claims abstract description 31
- 239000000446 fuel Substances 0.000 claims abstract description 12
- 238000003860 storage Methods 0.000 claims abstract description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000003546 flue gas Substances 0.000 claims abstract description 4
- 238000009825 accumulation Methods 0.000 claims abstract 9
- 238000010438 heat treatment Methods 0.000 claims description 56
- 239000013589 supplement Substances 0.000 claims description 15
- 239000002918 waste heat Substances 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000005286 illumination Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 229910052799 carbon Inorganic materials 0.000 abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 7
- 239000003245 coal Substances 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000001932 seasonal effect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D11/00—Central heating systems using heat accumulated in storage masses
- F24D11/02—Central heating systems using heat accumulated in storage masses using heat pumps
- F24D11/0214—Central heating systems using heat accumulated in storage masses using heat pumps water heating system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- 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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The application discloses a heat supply system and a control method for heat accumulation across seasons, wherein the heat supply system comprises a heat supply unit, a heat accumulation device across seasons, a heat exchange unit and a heat supply network, the heat supply unit comprises a coal-fired boiler heat supply unit, a biomass boiler heat supply unit, a solar heat supply unit and an industrial waste heat supply unit, the boiler heat supply unit comprises a fuel storage and supply device, a flue gas treatment device, a water circulation and water treatment device and an ash treatment device, a first side of the heat exchange unit exchanges heat with the heat supply unit, a second side of the heat exchange unit exchanges heat with the heat accumulation device across seasons, and the heat supply network is connected with the heat supply unit and the heat exchange unit through pipelines. The heat supply system and the control method for heat storage in a cross-season mode have the advantages of reducing carbon emission and being low in production cost.
Description
Technical Field
The application relates to the technical field of central heating, in particular to a heat supply system for heat storage in a crossing season and a control method.
Background
The central heating of China is forward to low-carbon and clean development and transformation. The proportion of clean energy such as solar energy, biomass energy, industrial waste heat and the like in concentrated heat supply is increased year by year. However, due to the large floor space, high initial investment and large weather influence, it is still difficult to use solar energy as a main heat source in large-scale central heating projects (such as heating of urban residents). For biomass energy, large-scale utilization is difficult to develop in areas with less abundant biomass resources due to the characteristics of high dispersing, storing and transporting cost, strong seasonality and the like.
In the central heat supply of medium and small cities, a large proportion of coal-fired industrial boilers (only supplying heat but not generating electricity, including chain furnaces, pulverized coal furnaces and the like) still exist as main heat sources. Heat source plants currently face the following challenges: (1) The carbon reduction responsibility and pressure are large, and although urban resident heating is civil engineering, the heat source plant of the coal-fired industrial boiler still exists for a long time, the pressure and responsibility for reducing carbon and emission still exist; (2) On one hand, the coal price is higher in recent years, and a plurality of heat supply enterprises are in a micro-profit and loss state, on the other hand, the heat supply enterprises only produce in heating seasons, and only have low-intensity activities such as equipment overhaul and the like in non-heating seasons, so that the average production intensity is low and the workload is not full throughout the year; (3) The difficulty of operation and management is high, and the production effect is difficult to improve and the operation is more difficult due to the seasonal production characteristic. Although the challenges are faced, the coal-fired heat supply boiler is replaced by clean energy in a large scale in such areas, and the coal-fired boiler is used as a main heat supply source in a short time and a long time and a considerable range.
Disclosure of Invention
The present application has been made based on the findings and knowledge of the inventors regarding the following facts and problems: in the central heat supply of middle and small cities, a coal-fired industrial boiler is used as a main heat source for a long time and in a considerable range, and a cleaner low-carbon heat source and a heat supply method are used for reducing carbon emission and production cost.
The present application aims to solve at least one of the technical problems in the related art to some extent.
Therefore, the embodiment of the application provides a heat supply system for heat storage in a crossing season and a control method, and the heat supply system for heat storage in a crossing season has the advantages of reduced carbon emission and low production cost.
According to the heat supply system for cross-season heat storage, the heat supply system for cross-season heat storage comprises a heat supply unit, a cross-season heat storage device, a heat exchange unit and a heat supply network, wherein the heat supply unit comprises a coal-fired boiler heat supply unit, a biomass boiler heat supply unit, a solar heat supply unit and an industrial waste heat supply unit, the boiler heat supply unit comprises a fuel storage and supply device, a flue gas treatment device, a water circulation and water treatment device and an ash treatment device, a first side of the heat exchange unit exchanges heat with the heat supply unit, a second side of the heat exchange unit exchanges heat with the cross-season heat storage device, and the heat supply network is connected with the heat supply unit and the heat exchange unit through pipelines.
The heat supply system for heat storage in a crossing season has the advantages of reducing carbon emission and being low in production cost. According to the application, clean energy is used as an auxiliary heat source, so that the coal ratio is reduced, heat which is not in a heating season is stored in a cross-season heat storage device and is discharged in the heating season for supplying heat, solar biomass energy can be fully utilized, and peripheral industrial waste heat can be utilized throughout the year to reduce the heat supply cost.
In some embodiments, the heat exchange unit comprises a first heat exchange unit, a second heat exchange unit, a third heat exchange unit, a fourth heat exchange unit and a fifth heat exchange unit, wherein the first heat exchange unit is communicated with the heat supply network, the second heat exchange unit exchanges heat with the coal-fired boiler unit, the third heat exchange unit exchanges heat with the solar heat supply unit, the fourth heat exchange unit exchanges heat with the industrial waste heat unit, and the fifth heat exchange unit exchanges heat with the biomass boiler heat supply unit.
In some embodiments, a second circulating pump is arranged between the coal-fired boiler unit and the second heat exchange unit, a third circulating pump is arranged between the solar heat supply unit and the third heat exchange unit, a fourth circulating pump is arranged between the industrial waste heat supply unit and the fourth heat exchange unit, a fifth circulating pump is arranged between the biomass boiler heat supply unit and the fifth heat exchange unit, and a sixth circulating pump is arranged between the first heat exchange unit and the cross-season heat storage device.
In some embodiments, a first three-way valve is arranged on the outlet main pipe of the coal-fired boiler, the first three-way valve is respectively connected with the heat supply network water supply main pipe and the water inlet of the first side of the second heat exchanger, the heat supply network water supply main pipe is communicated with a heat supply network, the water outlet of the first side of the second heat exchanger is communicated with the inlet main pipe of the main circulating pump, and the second side of the second heat exchanger is communicated with the cross-season heat storage device.
In some embodiments, a second three-way valve is arranged on a heat supply network water return pipe of the heat supply network, and the second three-way valve is communicated with a water inlet of the first heat exchange unit and an inlet main pipe of the main circulating pump.
In some embodiments, the outlet main pipe of the main circulation pump is connected to two branches, the first branch is connected to the water inlet of the coal-fired boiler, and the second branch is connected to the main pipe of the heat supply network water supply.
In some embodiments, the heat exchange unit includes a direct heat exchange module in parallel with the heat pump heat exchange module, a heat pump heat exchange module, and a controller electrically connected with the direct heat exchange module and the heat pump heat exchange module.
In some embodiments, a check valve is disposed between the first three-way valve and the mains water supply.
In some embodiments, the first three-way valve, the second three-way valve are regulating valves.
According to the method for controlling the heat supply system of the cross-season heat storage, which is disclosed by the embodiment of the application, the method for controlling the heat supply system of the cross-season heat storage comprises the following steps of:
closing a main pipe of a heat supply network in a non-heating season, and respectively exchanging heat with a heat exchange unit by a coal-fired boiler heat supply unit, a solar heat supply unit and an industrial waste heat supply unit, wherein the heat exchange unit exchanges heat to a cross-season heat storage device, the solar heat supply unit stops running when insufficient illumination exists, the industrial waste heat supply unit stops running when waste heat grade is low, the biomass boiler heat supply unit stops running, and the coal-fired boiler heat supply unit is started in the later period of the non-heating season to supplement heat to the cross-season heat storage device;
in the heating season, a main pipe of a heat supply network is opened, a coal-fired boiler heat supply unit is closed in the initial heating period and the final heating period, heat is supplied by a cross-season heat storage device, a solar heat supply unit, an industrial waste heat supply unit and a biomass boiler heat supply unit supplement heat to the cross-season heat storage device, the coal-fired boiler heat supply unit is opened in the middle heating period, and the heat is supplemented by the solar heat supply unit, the industrial waste heat supply unit and the biomass boiler heat supply unit in sequence in the final heating period.
Drawings
Fig. 1 is a schematic diagram of a heat supply system for storing heat across seasons in accordance with an embodiment of the present application.
Reference numerals: 1. a coal-fired boiler heating unit; 2. a biomass boiler heating unit; 3. a solar heat supply unit; 4. an industrial waste heat supply unit; 5. a cross-season heat storage device; 6. a first three-way valve; 7. a second three-way valve; 8. a first heat exchange unit; 9. a second heat exchange unit; 10. a third heat exchange unit; 11. a fourth heat exchange unit; 12. a fifth heat exchange unit; 13. a heat supply network.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.
According to the heat supply system for cross-season heat storage, the heat supply system for cross-season heat storage comprises a heat supply unit, a cross-season heat storage device, a heat exchange unit and a heat supply network, wherein the heat supply unit comprises a coal-fired boiler heat supply unit, a biomass boiler heat supply unit, a solar heat supply unit and an industrial waste heat supply unit, the boiler heat supply unit comprises a fuel storage and supply device, a flue gas treatment device, a water circulation and water treatment device and an ash treatment device, a first side of the heat exchange unit exchanges heat with the heat supply unit, a second side of the heat exchange unit exchanges heat with the cross-season heat storage device, and the heat supply network is connected with the heat supply unit and the heat exchange unit through pipelines. In the heat supply, low-temperature water is used as an inlet working medium, hot water or steam is used as an outlet working medium, the inlet working medium and the outlet working medium of the solar heat supply unit and the industrial waste heat supply unit are both water, the inlet working medium of the biomass boiler heat supply unit is water, the outlet working medium is water or steam is changed according to different boilers, and the boiler can be a water heater or a steam boiler. The heat supply unit conveys heat to the first side of the heat exchange unit, and the second side of the heat exchange unit heats circulating water of the cross-season heat storage device.
The heat supply system for heat storage in a crossing season has the advantages of reducing carbon emission and being low in production cost.
In some embodiments, the heat exchange unit comprises a first heat exchange unit, a second heat exchange unit, a third heat exchange unit, a fourth heat exchange unit and a fifth heat exchange unit, wherein the first heat exchange unit is communicated with the heat supply network, the second heat exchange unit exchanges heat with the coal-fired boiler unit, the third heat exchange unit exchanges heat with the solar heat supply unit, the fourth heat exchange unit exchanges heat with the industrial waste heat unit, and the fifth heat exchange unit exchanges heat with the biomass boiler heat supply unit.
Specifically, the structures of the heat exchange units are the same, the first heat exchange unit is arranged on the heat supply network pipeline to exchange heat with water at the outlet of the heat supply network, and the second heat exchange unit to the fifth heat exchange unit exchange heat with the heat supply unit.
In some embodiments, a second circulating pump is arranged between the coal-fired boiler unit and the second heat exchange unit, a third circulating pump is arranged between the solar heat supply unit and the third heat exchange unit, a fourth circulating pump is arranged between the industrial waste heat supply unit and the fourth heat exchange unit, a fifth circulating pump is arranged between the biomass boiler heat supply unit and the fifth heat exchange unit, and a sixth circulating pump is arranged between the first heat exchange unit and the cross-season heat storage device.
Specifically, the circulating pump pushes the circulating water to flow between the heat exchange unit and the heat supply unit to improve heat exchange efficiency.
In some embodiments, a first three-way valve is arranged on the outlet main pipe of the coal-fired boiler, the first three-way valve is respectively connected with the heat supply network water supply main pipe and the water inlet of the first side of the second heat exchanger, the heat supply network water supply main pipe is communicated with a heat supply network, the water outlet of the first side of the second heat exchanger is communicated with the inlet main pipe of the main circulating pump, and the second side of the second heat exchanger is communicated with the cross-season heat storage device.
Specifically, the first three-way valve connects the outlet main pipe of the coal-fired boiler with the heat supply network water supply main pipe and the second heat exchanger, the outlet main pipe of the coal-fired boiler is upstream, the heat supply network water supply main pipe and the second heat exchanger are downstream, the heat supply network water supply main pipe sends heat to a heat user, the second heat exchanger heats circulating water from the cross-season heat storage device, and a stop valve is arranged between the water outlet and the inlet main pipe of the first side of the second heat exchanger.
In some embodiments, a second three-way valve is arranged on a heat supply network water return pipe of the heat supply network, and the second three-way valve is communicated with a water inlet of the first heat exchange unit and an inlet main pipe of the main circulating pump.
Specifically, the heat supply network backwater is divided into two branches through a three-way valve, the first branch exchanges heat with the heat storage device crossing seasons through the first heat exchange unit, the second branch is directly converged with a first side water outlet pipeline of the first heat exchange unit, and the two branches are connected with an inlet main pipe of the main circulating pump through a stop valve. The second branch is a bypass of the first branch.
In some embodiments, the outlet main pipe of the main circulation pump is connected to two branches, the first branch is connected to the water inlet of the coal-fired boiler, and the second branch is connected to the main pipe of the heat supply network water supply.
Specifically, the main circulation pump outlet main pipe is bifurcated into two branches, the first branch enters the coal-fired boiler for heating after passing through the regulating valve, and the second branch is directly connected with the heat supply network water supply main pipe after passing through the other regulating valve. Thus, the first branch circuit realizes heat supply of the coal-fired boiler, the second branch circuit realizes short circuit of the coal-fired boiler, and different branch circuits are selectively opened according to seasons.
In some embodiments, the heat exchange unit includes a direct heat exchange module in parallel with the heat pump heat exchange module, a heat pump heat exchange module, and a controller electrically connected with the direct heat exchange module and the heat pump heat exchange module.
Specifically, the direct heat exchange module can be a steam-water heat exchanger or a water-water plate heat exchanger, and when the temperature of the working medium at the heat source side is higher than that of the working medium at the side to be heated and the temperature difference is large enough, the direct heat exchange module is adopted for heat exchange, so that the flow is simple and no direct power consumption exists; when the temperature of the heat source side working medium is higher than the temperature of the working medium at the side to be heated but the temperature difference is smaller, or the temperature of the working medium at the heat source side is lower than the temperature of the working medium at the side to be heated, the direct heat exchange efficiency is too low or cannot be carried out at all, at the moment, the direct heat exchange module is stopped, the heat exchange is carried out by switching to the heat pump heat exchange module, and the heat pump heat exchange module can fully utilize the heat of the working medium at the heat source side. The controller collects parameters such as temperature and flow of the working medium at the heat source side, temperature and flow of the working medium at the side to be heated and controls the automatic switching of the two modules. The heat pump may be an electrically driven heat pump or a thermally driven heat pump.
In some embodiments, a check valve is disposed between the first three-way valve and the mains water supply.
Specifically, a check valve is disposed between the first three-way valve and the mains water supply to prevent reverse flow, and a second branch of the main circulation pump outlet mains is connected downstream of the check valve.
In some embodiments, the first three-way valve, the second three-way valve are regulating valves.
Specifically, the first three-way valve and the second three-way valve are regulating valves for regulating the flow distribution of the two branches, and the flow distribution is changed between 0% and 100% of the total flow.
According to the method for controlling the heat supply system of the cross-season heat storage, which is disclosed by the embodiment of the application, the method for controlling the heat supply system of the cross-season heat storage comprises the following steps of:
closing a main pipe of a heat supply network in a non-heating season, and respectively exchanging heat with a heat exchange unit by a coal-fired boiler heat supply unit, a solar heat supply unit and an industrial waste heat supply unit, wherein the heat exchange unit exchanges heat to a cross-season heat storage device, the solar heat supply unit stops running when insufficient illumination exists, the industrial waste heat supply unit stops running when waste heat grade is low, the biomass boiler heat supply unit stops running, and the coal-fired boiler heat supply unit is started in the later period of the non-heating season to supplement heat to the cross-season heat storage device; in non-heating seasons, the solar heat collector of the solar heat supply unit continuously supplements heat to the cross-season heat storage device, and the solar heat collector is stopped when illumination is insufficient. The industrial waste heat supply unit supplements heat to the cross-season heat storage device according to the grade and the supply condition, when the grade of waste heat is lower (for example, the temperature of a waste heat side working medium is lower than 30 ℃), the waste heat supply unit can be considered to stop the heat supplement link, but needs to be coordinated with a waste heat supply side production unit, and the waste heat is required to be discharged by the latter to meet the production condition. The biomass boiler of the biomass boiler heating unit should generally be shut down. The fuel can be stored for months or even across years with little energy loss, so the activities of collecting, processing and storing biomass fuel are carried out in non-heating seasons, and the biomass fuel is reserved for recycling in heating seasons. If the storage area is insufficient due to large collection amount under special conditions, the biomass boiler can be started to store heat of the biomass boiler into the cross-season heat storage device in non-heating seasons.
And starting the coal-fired boiler of the coal-fired boiler heating unit to supplement heat to the cross-season heat storage device in a period from the later period of the non-heating season, namely, the period from the high temperature period in summer to the period before the heating season. The heating period is not started because the electricity consumption load of the air conditioner is basically ended, the heating period belongs to the relatively low-level season of coal demand (the non-severe cold region in the north is generally 9 months to 10 months), the coal price is relatively low, meanwhile, the heating period is not too long, the heat loss along with the time is also small, and therefore, the heat source factory starts the coal-fired boiler and stores heat in the period, and the economical efficiency is good
In the heating season, a main pipe of a heat supply network is opened, a coal-fired boiler heat supply unit is closed in the initial heating period and the final heating period, heat is supplied by a cross-season heat storage device, a solar heat supply unit, an industrial waste heat supply unit and a biomass boiler heat supply unit supplement heat to the cross-season heat storage device, the coal-fired boiler heat supply unit is opened in the middle heating period, and the heat is supplemented by the solar heat supply unit, the industrial waste heat supply unit and the biomass boiler heat supply unit in sequence in the final heating period.
The heat storage device is used for supplying heat in the early stage of the heating season completely, the coal-fired boiler is disabled, the solar heat supply unit and the industrial waste heat supply unit are used for supplementing heat to the heat storage device in the season preferentially, and the coal-fired boiler can be disabled if the grade of the industrial waste heat is lower. With the increase of heating load demand, the heat supplement of the cross-season heat storage device is gradually insufficient, and a biomass boiler heat supply unit is started at the moment. Biomass fuel of the biomass boiler is collected before heating season, and is difficult to supplement due to season reasons in the heating season, so that the stock is gradually reduced until the biomass fuel is exhausted.
As the heating season goes deep, the heating load demand increases, and the sum of heat from the solar heat collector, the industrial waste heat and the biomass boiler is insufficient to supplement heat for the seasonal heat storage device, and the coal-fired boiler is started at the moment. Because the economical efficiency and the stability of the boiler are poor when the load rate is low, the coal-fired boiler operates according to the following guiding principle: if the load rate of the coal-fired boiler required for meeting the total heating heat load requirement is lower than a certain value (the range of the value is 55% -65%), the factor of the heat efficiency of the boiler is considered, and the heat storage loss is also considered, so that the 'excessive' heat is sent to the second heat exchange unit through the branch controlled by the first three-way valve and then stored in the cross-season heat storage device. Since the coal-fired boiler is the main heat source of the system (meaning that the rated heat load is higher), the coal-fired boiler should be provided with higher heat efficiency when being started to improve economy, and therefore, when the coal-fired boiler needs to be started but the load rate requirement of heating on the coal-fired boiler is not high, the load rate of the biomass boiler should be reduced or the biomass boiler is directly stopped.
At the end of the heating season, the heating load demand gradually decreases along with the rising of the air temperature, the heat from the solar heat collector and the industrial waste heat is mainly used, when the supply is insufficient, the biomass boiler is started to supplement heat preferentially, and if the biomass fuel is exhausted, the coal-fired boiler is started to supplement heat.
When the heating season is over, the following states should be reached: the maximum utilization of biomass fuel (generally, the exhaustion, namely the zero reserve, unless the biomass fuel reserve is so large that the biomass cannot be exhausted even if the coal-fired boiler is not started at all in the heating season) is realized, and the average water temperature of the seasonal heat storage device is not higher than 25-30 ℃.
The technical advantages of the control method of the heat supply system for cross-season heat storage according to the embodiment of the application are the same as those of the heat supply system for cross-season heat storage, and are not repeated here.
In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present application have been shown and described above, it should be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those skilled in the art without departing from the scope of the application.
Claims (10)
1. A heat supply system for storing heat across seasons, comprising:
the heat supply unit comprises a coal-fired boiler heat supply unit, a biomass boiler heat supply unit, a solar heat supply unit and an industrial waste heat supply unit, wherein the boiler heat supply unit comprises a fuel storage and supply device, a flue gas treatment device, a water circulation and water treatment device and an ash treatment device;
a cross-season heat storage device;
the first side of the heat exchange unit exchanges heat with the heat supply unit, and the second side of the heat exchange unit exchanges heat with the cross-season heat storage device;
and the heat supply network is connected with the heat supply unit and the heat exchange unit through pipelines.
2. The heat storage and supply system for cross-season heat storage according to claim 1, wherein the heat exchange units comprise a first heat exchange unit, a second heat exchange unit, a third heat exchange unit, a fourth heat exchange unit and a fifth heat exchange unit, the first heat exchange unit is communicated with the heat supply network, the second heat exchange unit exchanges heat with the coal-fired boiler unit, the third heat exchange unit exchanges heat with the solar heat supply unit, the fourth heat exchange unit exchanges heat with the industrial waste heat unit, and the fifth heat exchange unit exchanges heat with the biomass boiler heat supply unit.
3. The heat supply system for heat accumulation across seasons according to claim 2, wherein a second circulating pump is arranged between the coal-fired boiler unit and the second heat exchange unit, a third circulating pump is arranged between the solar heat supply unit and the third heat exchange unit, a fourth circulating pump is arranged between the industrial waste heat supply unit and the fourth heat exchange unit, a fifth circulating pump is arranged between the biomass boiler heat supply unit and the fifth heat exchange unit, and a sixth circulating pump is arranged between the first heat exchange unit and the heat accumulation device across seasons.
4. The heat supply system for heat accumulation in a crossing season according to claim 1, wherein a first three-way valve is arranged on an outlet main pipe of the coal-fired boiler, the first three-way valve is respectively connected with a heat supply network water supply main pipe and a water inlet of a first side of a second heat exchanger, the heat supply network water supply main pipe is communicated with a heat supply network, a water outlet of the first side of the second heat exchanger is communicated with an inlet main pipe of a main circulating pump, and a second side of the second heat exchanger is communicated with the heat accumulation device in a crossing season.
5. The heat supply system for heat accumulation across seasons according to claim 4, wherein a second three-way valve is arranged on a heat supply network return pipe of the heat supply network, and the second three-way valve is communicated with a water inlet of the first heat exchange unit and an inlet main pipe of the main circulating pump.
6. The heat supply system for heat accumulation across seasons according to claim 4, wherein the main circulation pump outlet main pipe is connected with two branches, the first branch is connected with the water inlet of the coal-fired boiler, and the second branch is connected with the main pipe of the heat supply network.
7. The heat storage and supply system according to claim 1, wherein the heat exchange unit comprises a direct heat exchange module, a heat pump heat exchange module and a controller, the direct heat exchange module is connected in parallel with the heat pump heat exchange module, and the controller is electrically connected with the direct heat exchange module and the heat pump heat exchange module.
8. The trans-season heat storage and supply system according to claim 4, wherein a check valve is provided between the first three-way valve and the main pipe of the heat supply network.
9. The heat storage and supply system for cross-season heat storage according to claim 4, wherein the first three-way valve and the second three-way valve are regulating valves.
10. The heat supply system control method for heat storage in a crossing season is characterized by comprising the following steps of:
closing a main pipe of a heat supply network in a non-heating season, and respectively exchanging heat with a heat exchange unit by a coal-fired boiler heat supply unit, a solar heat supply unit and an industrial waste heat supply unit, wherein the heat exchange unit exchanges heat to a cross-season heat storage device, the solar heat supply unit stops running when insufficient illumination exists, the industrial waste heat supply unit stops running when waste heat grade is low, the biomass boiler heat supply unit stops running, and the coal-fired boiler heat supply unit is started in the later period of the non-heating season to supplement heat to the cross-season heat storage device;
in the heating season, a main pipe of a heat supply network is opened, a coal-fired boiler heat supply unit is closed in the initial heating period and the final heating period, heat is supplied by a cross-season heat storage device, a solar heat supply unit, an industrial waste heat supply unit and a biomass boiler heat supply unit supplement heat to the cross-season heat storage device, the coal-fired boiler heat supply unit is opened in the middle heating period, and the heat is supplemented by the solar heat supply unit, the industrial waste heat supply unit and the biomass boiler heat supply unit in sequence in the final heating period.
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| CN202310912750.5A CN117029082A (en) | 2023-07-24 | 2023-07-24 | Heat supply system for heat storage in seasons and control method |
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| CN202310912750.5A CN117029082A (en) | 2023-07-24 | 2023-07-24 | Heat supply system for heat storage in seasons and control method |
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