CN115176631A - Solar long-short term coupling heat storage-based multi-energy complementary greenhouse system and method - Google Patents
Solar long-short term coupling heat storage-based multi-energy complementary greenhouse system and method Download PDFInfo
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- CN115176631A CN115176631A CN202210759719.8A CN202210759719A CN115176631A CN 115176631 A CN115176631 A CN 115176631A CN 202210759719 A CN202210759719 A CN 202210759719A CN 115176631 A CN115176631 A CN 115176631A
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
- A01G9/24—Devices or systems for heating, ventilating, regulating temperature, illuminating, or watering, in greenhouses, forcing-frames, or the like
- A01G9/246—Air-conditioning systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/50—Solar heat collectors using working fluids the working fluids being conveyed between plates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S50/00—Arrangements for controlling solar heat collectors
- F24S50/40—Arrangements for controlling solar heat collectors responsive to temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S60/00—Arrangements for storing heat collected by solar heat collectors
- F24S60/30—Arrangements for storing heat collected by solar heat collectors storing heat in liquids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S80/00—Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
- F24S80/30—Arrangements for connecting the fluid circuits of solar collectors with each other or with other components, e.g. pipe connections; Fluid distributing means, e.g. headers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/12—Technologies relating to agriculture, livestock or agroalimentary industries using renewable energies, e.g. solar water pumping
Abstract
The invention discloses a solar long-short term coupling heat storage-based multi-energy complementary greenhouse system and a method, wherein the system comprises the following steps: the outlet end of the solar heat collection plate is respectively connected with the first inlets of the cross-season heat storage pool and the partition heat storage tank, the inlet end of the solar heat collection plate is respectively connected with the first outlets of the cross-season heat storage pool and the partition heat storage tank, and the stored water in the cross-season heat storage pool and the partition heat storage tank is heated through the solar heat collection plate; the heat supply subsystem comprises a greenhouse system; the second outlets of the cross-season heat storage pool and the partition heat storage tank are respectively connected with a first inlet and a second inlet of the greenhouse system, the second inlets of the cross-season heat storage pool and the partition heat storage tank are respectively connected with a first outlet and a second outlet of the greenhouse system, and heat is supplied to the greenhouse system through the hot water in the cross-season heat storage pool and the partition heat storage tank. The flexibility of temperature regulation of the greenhouse system is improved.
Description
Technical Field
The invention relates to the technical field of greenhouse systems, in particular to a solar long-short term coupling heat storage-based multi-energy complementary greenhouse system and a method.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
The solar cross-season heat storage technology can effectively overcome the problem of non-uniformity of solar resources in time distribution, solar radiation energy in summer and autumn is stored in winter through the heat storage technology, and heat is supplied to the interior of the greenhouse at night in winter. Compared with the traditional method for preventing crops from being frozen by using electric energy or fossil fuel to provide heat for greenhouses, the method has the advantages that energy is saved and environmental pollution is reduced by using the solar cross-season heat storage technology.
The mode of storing heat by using the water tank is a mature mode in the solar seasonal heat storage technology, and compared with the gravel-water heat storage technology, the buried pipe heat storage technology and the aquifer heat storage technology, the mode has the advantages of low geological requirement, convenience in construction and high heat storage density. However, the single seasonal solar heat storage technology has the problem of single operation mode, and the flexibility in the temperature adjustment process is poor due to the large heat storage volume; and the problem of low utilization rate of industrial waste heat still exists at present.
The patent application number 201310547592.4 discloses a heating system for solar cross-season energy storage by using a soil source heat pump, which comprises a solar heat collector, a heat collection water tank, a ground temperature recording system, an underground buried pipe heat exchanger, a soil source heat pump unit and a heating user. The soil temperature is improved by storing solar heat by utilizing the soil in different seasons, so that the working efficiency of the soil source heat pump is improved.
However, the system has problems that: the solar energy collector is not used in winter, so that the solar energy is wasted in winter; solar energy is collected by the heat collection water tank and then stored in soil, so that large heat loss is caused, and the phenomenon is more serious when the ambient temperature is low.
Chinese patent with patent application number 202022670035.X proposes a solar energy and strides season heat-retaining heating system, and this system reduces the heat loss among the heat transfer process through directly storing solar energy underground, improves system thermal-arrest and heat-retaining efficiency, utilizes middle circulation water tank to highly combine solar energy heat supply and geothermal source heat pump heat supply simultaneously, promotes unit performance and system solar energy utilization ratio.
However, the system has problems that: although the frost resistance is improved by using the vacuum tube solar heat collector, the investment is increased; the buried well group is used for storing heat in a cross-season mode, so that the requirement on geology is high and the initial cost is high; in the cross-season heat storage process, short-term heat storage device adjustment is lacked, and the flexibility of system heat utilization is poor.
In the technology of long-short term coupling heat storage disclosed in the prior art, the invention patent with the patent application number of 202010901835.X provides a long-short term coupling heat storage solar heating system model based on TRNSYS and a modeling method. Coupling a short-term heat storage water tank on the basis of a traditional single heat storage water tank, and heating a user by the short-term heat storage water tank when the water supply temperature of a long-term heat storage water tank is lower in the final stage of heating; different heat storage and heating modes are selected according to the outlet temperature of the cross-season heat storage water tank or the short-term heat storage water tank, and the heating load is adjusted according to the actual dynamic heat load of a user, so that the solar energy utilization rate and the guarantee rate of the long-term and short-term coupled heating system are guaranteed, and the long-term and short-term coupled heat storage of solar energy is realized. However, the heat source is single, and electric energy or fossil fuel is still used for heating under extreme climatic conditions.
Disclosure of Invention
In order to solve the problems, the invention provides a solar long-short term coupling heat storage-based multi-energy complementary greenhouse system and a solar long-short term coupling heat storage-based multi-energy complementary greenhouse method.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a solar long-short term coupling heat storage based multi-energy complementary greenhouse system, comprising: the heat collection subsystem, the heat storage subsystem and the heat supply subsystem;
the heat collection subsystem comprises a solar heat collection plate;
the heat storage subsystem comprises a cross-season heat storage pool and a partition heat storage tank; the outlet end of the solar heat collection plate is respectively connected with a first inlet of the cross-season heat storage pool and a first inlet of the partition plate heat storage tank, and the inlet end of the solar heat collection plate is respectively connected with a first outlet of the cross-season heat storage pool and a first outlet of the partition plate heat storage tank, so that the stored water in the cross-season heat storage pool and the partition plate heat storage tank is heated through the solar heat collection plate according to the temperatures of the cross-season heat storage pool and the partition plate heat storage tank;
the heating subsystem comprises a greenhouse system; the second outlets of the cross-season heat storage pool and the partition heat storage tank are respectively connected with a first inlet and a second inlet of the greenhouse system, and the second inlets of the cross-season heat storage pool and the partition heat storage tank are respectively connected with a first outlet and a second outlet of the greenhouse system; the greenhouse system is supplied with heat through the hot water stored in the cross-season heat storage tank and the partition plate heat storage tank.
As an alternative embodiment, the outlet end of the solar heat collection plate is respectively connected with a first circulating water pump and a second circulating water pump through a first three-way valve, the first circulating water pump is connected with a first inlet of the seasonal heat storage pool through a first electronic valve, and the second circulating water pump is connected with a first inlet of the partition heat storage tank through a second electronic valve;
the inlet end of the solar heat collection plate is respectively connected with the partition heat storage tank and the first outlet of the cross-season heat storage pool through a second three-way valve, and a third circulating water pump is arranged between the second three-way valve and the first outlet of the cross-season heat storage pool.
As an alternative embodiment, when the temperature in the cross-season heat storage pool is lower than the temperature of the solar heat collection plate and the temperature difference value is greater than the temperature difference threshold value, the stored water in the cross-season heat storage pool flows into the solar heat collection plate by starting the third circulating water pump and the second three-way valve, and the stored water flows into the cross-season heat storage pool by starting the first three-way valve, the first circulating water pump and the first electronic valve after being heated by the solar heat collection plate;
and when the temperature of the water in the cross-season heat storage tank is lower than that of the solar heat collection plate and the temperature difference value is smaller than the temperature difference threshold value, the first circulating water pump, the first electronic valve and the third circulating water pump are closed.
As an alternative embodiment, when the temperature in the partition heat storage tank is lower than the temperature of the solar heat collection plate and the temperature difference value is greater than the temperature difference threshold value, the stored water in the partition heat storage tank flows into the solar heat collection plate by starting the second three-way valve, and after being heated by the solar heat collection plate, the stored water flows into the partition heat storage tank by starting the first three-way valve, the second circulating water pump and the second electronic valve;
and when the temperature in the partition heat storage tank is lower than that of the solar heat collection plate and the temperature difference value is smaller than the temperature difference threshold value, closing the second circulating water pump and the second electronic valve.
As an alternative embodiment, the cross-season heat storage tank adopts an inverted trapezoidal structure;
paving an anti-seepage material inside the cross-season heat storage tank;
a movable heat insulation plate is arranged in the clapboard heat storage tank;
and the tank wall of the clapboard heat storage tank is provided with heat insulation paint.
As an alternative embodiment, the second outlet of the seasonal heat storage tank is connected with the first inlet of the greenhouse system through a fourth circulating water pump and a third electronic valve in sequence, and the second inlet of the seasonal heat storage tank is connected with the first outlet of the greenhouse system through a fifth circulating water pump;
and a second outlet of the partition heat storage tank is connected with a second inlet of the greenhouse system sequentially through a sixth circulating water pump and a fourth electronic valve, and the second inlet of the partition heat storage tank is connected with a second outlet of the greenhouse system through a seventh circulating water pump.
In an alternative embodiment, in the heat collecting stage, when the temperature in the greenhouse system is lower than the temperature threshold value, the hot water in the partition heat storage tank flows into the greenhouse system by starting the sixth water circulating pump and the fourth electronic valve, and after heat exchange, the hot water flows into the partition heat storage tank by starting the seventh water circulating pump.
As an alternative embodiment, in the heating stage, when the temperature of the inside of the greenhouse system is lower than the required temperature, the hot water in the cross-season heat storage pool flows into the greenhouse system by starting the fourth water circulating pump and the third electronic valve, and after heat exchange, the hot water flows into the cross-season heat storage pool by starting the fifth water circulating pump.
As an alternative embodiment, the multi-energy complementary greenhouse system further comprises a waste heat recovery subsystem, wherein the waste heat recovery subsystem comprises an industrial waste heat end and a heat exchanger; the heat exchanger is connected with the industrial waste heat end through an eighth circulating water pump and a ninth circulating water pump, and the heat exchanger is connected with the greenhouse system through a tenth circulating water pump and a fifth electronic valve;
and starting an eighth circulating water pump, exchanging heat between the heat from the industrial waste heat end and circulating water for heating in the heat exchanger, starting a fifth electronic valve after heat exchange, conveying the heated circulating water into the greenhouse system through a tenth circulating water pump, and conveying the heat-exchanged working medium in the heat exchanger back to the industrial waste heat end through a ninth circulating water pump.
In a second aspect, the present invention provides a working method of the solar long-short term coupling heat storage based multi-energy complementary greenhouse system according to the first aspect, including:
starting a relevant valve and a circulating water pump according to the temperatures of the cross-season heat storage pool and the partition heat storage tank, and heating the stored water in the cross-season heat storage pool and the partition heat storage tank through a solar heat collection plate;
and starting related valves and a circulating water pump according to the temperature in the greenhouse system and the required temperature, and supplying heat to the greenhouse system through the hot water in the season-crossing heat storage tank and the partition heat storage tank.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a solar long-short term coupling heat storage-based multi-energy complementary greenhouse system and a solar long-short term coupling heat storage-based multi-energy complementary greenhouse method.
The invention provides a solar long-short term coupling heat storage based multi-energy complementary greenhouse system and a method thereof, which can recycle industrial waste heat, solve the problem of temperature reduction in a heat storage pool at the later stage of a heat supply stage, replace the problem of energy waste or pollution caused by the fact that the traditional greenhouse uses electric energy and fossil fuel to supply heat for the greenhouse at the end of a heat supply season, and increase the environmental benefit while improving the utilization rate of the industrial waste heat energy.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are included to illustrate an exemplary embodiment of the invention and not to limit the invention.
Fig. 1 is a schematic view of a solar long-short term coupled heat storage-based multi-energy complementary greenhouse system according to embodiment 1 of the present invention;
fig. 2 is a schematic view of a cross-season heat storage pool provided in embodiment 1 of the present invention;
fig. 3 is a schematic diagram of a heat storage tank with a partition according to embodiment 1 of the present invention;
the solar heat collecting plate comprises a solar heat collecting plate 1, a solar heat collecting plate 2, a first three-way valve 3, a first circulating water pump 4, a first electronic valve 5, a fourth circulating water pump 6, a third electronic valve 7, a fifth circulating water pump 8, a third circulating water pump 9, a second three-way valve 10, a season-crossing heat storage pool 11, a second circulating water pump 12, a second electronic valve 13, a partition heat storage tank 14, a sixth circulating water pump 15, a fourth electronic valve 16, a greenhouse system 17, a seventh circulating water pump 18, industrial waste heat ends 19, an eighth circulating water pump 20, a heat exchanger 21, a tenth circulating water pump 18, 22, a fifth electronic valve 23 and a ninth circulating water pump.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should be understood that the terms "comprises" and "comprising", and any variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Example 1
As shown in fig. 1, the present embodiment provides a solar long-short term coupled heat storage based multi-energy complementary greenhouse system, which includes: the system comprises a heat collection subsystem, a heat storage subsystem, a heat supply subsystem, a waste heat recovery subsystem and a control subsystem;
a solar long-short term coupling heat storage based multi-energy complementary greenhouse system comprises: the heat collection subsystem, the heat storage subsystem and the heat supply subsystem;
wherein the heat collection subsystem comprises a solar heat collection plate 1;
the heat storage subsystem comprises a season-crossing heat storage pool 10 and a partition heat storage tank 13; the outlet end of the solar heat collection plate 1 is respectively connected with the first inlets of the season-crossing heat storage pool 10 and the partition heat storage tank 13, and the inlet end of the solar heat collection plate 1 is respectively connected with the first outlets of the season-crossing heat storage pool 10 and the partition heat storage tank 13, so that stored water in the season-crossing heat storage pool 10 and the partition heat storage tank 13 is heated through the solar heat collection plate according to the temperatures in the season-crossing heat storage pool 10 and the partition heat storage tank 13;
the heating subsystem includes a greenhouse system 16; second outlets of the cross-season heat storage tank 10 and the partition plate heat storage tank 13 are respectively connected with a first inlet and a second inlet of the greenhouse system 16, and second inlets of the cross-season heat storage tank 10 and the partition plate heat storage tank 13 are respectively connected with a first outlet and a second outlet of the greenhouse system 16; so as to supply heat to the greenhouse system 16 through the hot water in the cross-season heat storage pool 10 and the clapboard heat storage tank 13.
In this embodiment, a temperature monitor is arranged on the solar heat collecting plate 1, and the temperature of the solar heat collecting plate 1 is obtained in real time;
as an alternative embodiment, the solar heat collecting plate 1 is installed inside the greenhouse, so that the influence of environmental factors on the heat absorption efficiency of the solar heat collecting plate 1 is effectively reduced.
As an alternative embodiment, the solar heat collecting plate 1 adopts a vanadium-titanium black ceramic solar heat collecting plate, and has the advantages of high strength, good hardness, difficulty in corrosion and aging, high solar energy absorption rate and good working performance.
In this embodiment, the heat storage subsystem includes: a cross-season heat storage pool 10 and a partition heat storage tank 13; the outlet end of the solar heat collection plate 1 is respectively connected with a first circulating water pump 3 and a second circulating water pump 11 through a first three-way valve 2, the first circulating water pump 3 is connected with a first inlet of a seasonal heat storage pool 10 through a first electronic valve 4, and the second circulating water pump 11 is connected with a first inlet of a partition heat storage tank 13 through a second electronic valve 12;
the inlet end of the solar heat collection plate 1 is respectively connected with a partition heat storage tank 13 and a first outlet of the cross-season heat storage pool 10 through a second three-way valve 9, and a third circulating water pump 8 is arranged between the second three-way valve 9 and the first outlet of the cross-season heat storage pool 10;
according to different operation modes, the water stored in the cross-season heat storage tank 10 and the partition heat storage tank 13 flows into the solar heat collection plate 1 through the second three-way valve 9, and the hot water heated by the solar heat collection plate 1 respectively enters the partition heat storage tank 13 and the cross-season heat storage tank 10 through the first three-way valve 2;
specifically, when the cross-season heat storage tank 10 stores heat, the third circulating water pump 8 is started, the stored water in the cross-season heat storage tank 10 flows into the solar heat collecting plate 1 to store heat, and flows into the cross-season heat storage tank 10 through the first three-way valve 2, the first circulating water pump 3 and the first electronic valve 4 after heat storage;
when the partition heat storage tank 13 stores heat, the stored water in the partition heat storage tank 13 flows into the solar heat collection panel 1 through the second three-way valve 9 to store heat, and flows into the partition heat storage tank 13 through the first three-way valve 2, the second water circulation pump 11 and the second electronic valve 12 after storing heat.
In this embodiment, temperature monitors are respectively arranged in the cross-season heat storage pool 10 and the partition heat storage tank 13 to obtain the water temperature in the cross-season heat storage pool 10 and the internal temperature of the partition heat storage tank 13;
when the temperature of water in the cross-season heat storage pool 10 is lower than the temperature of the solar heat collection plate 1 and the temperature difference value is larger than a set temperature difference threshold value, a first circulating water pump 3, a first electronic valve 4 and a third circulating water pump 8 are started, stored water in the cross-season heat storage pool 10 flows into the solar heat collection plate 1 through the third circulating water pump 8 and a second three-way valve 9, and after the water is heated by absorbed solar energy through the solar heat collection plate 1, the stored water flows into the cross-season heat storage pool 10 through a first three-way valve 2, the first circulating water pump 3 and the first electronic valve 4;
and when the temperature of the water in the cross-season heat storage pool 10 is lower than that of the solar heat collection plate 1 and the temperature difference value is smaller than a set temperature difference threshold value, the first water circulation pump 3, the first electronic valve 4 and the third water circulation pump 8 are closed.
When the internal temperature of the partition heat storage tank 13 is lower than the temperature of the solar heat collection plate 1 and the temperature difference value is greater than a set temperature difference threshold value, a second water circulation pump 11 and a second electronic valve 12 are started, stored water in the partition heat storage tank 13 flows into the solar heat collection plate 1 through a second three-way valve 9, and after being heated by the solar heat collection plate 1, the stored water flows into the partition heat storage tank 13 through a first three-way valve 2, the second water circulation pump 11 and the second electronic valve 12;
when the internal temperature of the partition heat storage tank 13 is lower than the temperature of the solar heat collection panel 1 and the temperature difference value is smaller than the set temperature difference threshold value, the second water circulation pump 11 and the second electronic valve 12 are closed.
Alternatively, the temperature difference threshold is set to 10 ℃.
As shown in fig. 2, the seasonal heat storage tank 10 adopts an inverted trapezoidal structure, the inverted trapezoidal structure has the advantage of soil mechanics stability, soil is used as a natural heat insulation material, impermeable materials are paved around, at the bottom and at the top of the seasonal heat storage tank 10, heat preservation is performed, and heat loss of a water body in the heat storage process is reduced. The cross-season heat storage tank 10 maintains the heat storage state all the time, and heat loss of the cross-season heat storage tank 10 can be effectively reduced.
As shown in fig. 3, a movable heat insulation plate is arranged inside the partition heat storage tank 13, so that mixing of cold and hot fluids can be effectively prevented in the heat storage process, the thickness of an inclined temperature layer inside the partition heat storage tank 13 is remarkably reduced, and the heat storage efficiency is improved; and the tank wall of the partition heat storage tank 13 is coated with heat insulation paint to improve the heat storage performance of the tank body, and when the system is in a heat storage stage, heat can be supplied by using the heat stored in the partition heat storage tank 13 if the system needs to supply heat.
In this embodiment, the heating subsystem includes a greenhouse system 16; a second outlet of the cross-season heat storage tank 10 is connected with a first inlet of the greenhouse system 16 through a fourth circulating water pump 5 and a third electronic valve 6 in sequence, and a second inlet of the cross-season heat storage tank 10 is connected with a first outlet of the greenhouse system 16 through a fifth circulating water pump 7;
and a second outlet of the partition heat storage tank 13 is connected with a second inlet of the greenhouse system 16 through a sixth water circulating pump 14 and a fourth electronic valve 15 in sequence, and a second inlet of the partition heat storage tank 13 is connected with a second outlet of the greenhouse system 16 through a seventh water circulating pump 17.
A temperature monitor is arranged in the greenhouse system 16 to obtain the internal temperature of the greenhouse system 16;
in the heat collecting stage and when the temperature is lower than the set threshold value, such as in rainy days or low night temperature in the heat collecting stage, if the heat in the cross-season heat storage tank 10 is used for heat supply, the heat storage efficiency of the cross-season heat storage tank 10 is reduced, and the heat stored in the partition heat storage tank 13 is used for heat supply in consideration of less heat required by the greenhouse system 16 in the stage;
when the internal temperature of the greenhouse system 16 is lower than the temperature threshold value, the sixth circulating water pump 14, the fourth electronic valve 15 and the seventh circulating water pump 17 are started, the hot water stored in the partition heat storage tank 13 flows into the heat dissipation coil inside the greenhouse system 16 through the heat supply pipeline by opening the sixth circulating water pump 14 and the fourth electronic valve 15, and after heat exchange with the air inside the greenhouse system 16, the greenhouse system 16 is heated, and after the heat supply is finished, the hot water flows into the partition heat storage tank 13 through the water return pipeline by opening the seventh circulating water pump 17.
In the heat supply stage, the greenhouse system 16 needs large heat, when the internal temperature of the greenhouse system 16 is lower than the temperature needed by crop growth, the fourth circulating water pump 5, the third electronic valve 6 and the fifth circulating water pump 7 are started, the hot water in the cross-season heat storage pool 10 flows into a heat dissipation coil in the greenhouse system 16 through a heat supply pipeline under the action of the fourth circulating water pump 5 through the opening of the fourth circulating water pump 5 and the third electronic valve 6, heat is supplied to the greenhouse system 16 after the heat exchange with the air in the greenhouse system 16, and after the heat supply is finished, the hot water flows into the cross-season heat storage pool 10 through a water return pipeline by the opening of the fifth circulating water pump 7;
at the later stage of the heat supply stage, the heat stored in the cross-season heat storage tank 10 may not satisfy the greenhouse system 16, and then the fourth circulating water pump 5, the third electronic valve 6 and the fifth circulating water pump 7 are closed, and the waste heat recovery subsystem is started to supply heat.
As an alternative embodiment, the heat supply coil inside the greenhouse system 16 is arranged on the ground, and hot water heats the air inside the greenhouse through the heat supply coil, so that the crop roots can be effectively heated, the occurrence of the root freezing phenomenon is prevented, and the effective utilization rate of heat is improved.
In this embodiment, the waste heat recovery subsystem includes a heat exchanger 20; the heat exchanger 20 is connected with the industrial waste heat end 18 through an eighth circulating water pump 19 and a ninth circulating water pump 23, and the heat exchanger 20 is connected with the greenhouse system 16 through a tenth circulating water pump 21 and a fifth electronic valve 22;
the industrial waste heat end 18 is used for recovering industrial waste heat, when the industrial waste heat is needed to be used for heating circulating water, the eighth circulating water pump 19 is started, heat from the industrial waste heat end 18 and the circulating water used for heating exchange heat inside the heat exchanger 20, after heating, the fifth electronic valve 22 is started, and the heated circulating water is transported to a heating coil inside the greenhouse through the tenth circulating water pump 21 to supply heat to the greenhouse system 16; meanwhile, the working medium which supplies heat to the circulating water in the heat exchanger 20 is transported back to the industrial waste heat end 18 by the ninth circulating water pump 23.
The industrial production is often accompanied with the production of waste heat, and under the lower operating mode of temperature, the circulating water in the heat supply network pipeline absorbs the industrial waste heat of industrial waste heat end 18 through heat exchanger 20, transports to greenhouse system 16 in the heat supply, avoids greenhouse system in the end of the heating season because the water storage temperature is not enough and need the phenomenon of using electric energy or fossil fuel cross season, improves the utilization ratio of the energy, reduces required energy consumption, increases environmental protection economic benefits.
In an alternative embodiment, the heat exchanger 20 is a plate heat exchanger.
As an alternative embodiment, the industrial waste heat resource is industrial waste heat of cement manufacturing enterprises, the exhaust temperature of the cement kiln is 600-700 ℃, the industrial waste heat generated in cement production is recycled and then used in a greenhouse system, and the first industry and the second industry are developed in a combined mode.
In this embodiment, the control subsystem includes an automatic start-stop control module and a control terminal;
the automatic start-stop control module automatically starts and stops through a preset temperature range and a preset temperature difference; for example, in the heat collection subsystem, when the temperature difference between the temperature of the solar heat collection plate 1 and the temperature of the cross-season heat storage pool 10 or the partition heat storage tank 13 is lower than a temperature difference threshold value, closing of corresponding valves is controlled;
when the internal temperature of the greenhouse system 16 is lower than the temperature required by the normal growth of crops, the corresponding valve is automatically opened to supply heat;
when the temperature in the cross-season heat storage pool cannot meet the temperature requirement of the greenhouse system in the later stage of heat supply, the corresponding valve is automatically closed, and the waste heat recovery subsystem is controlled to be started.
The control terminal performs manual operation on each subsystem through a mobile phone application program or a computer webpage, such as opening or closing a valve, starting or stopping a single water pump and the like; meanwhile, the monitored internal temperature of the greenhouse, the internal temperature of the cross-season heat storage pool, the internal temperature of the partition heat storage tank, the temperature of the solar heat collection plate, the weather condition and the like are fed back to the control terminal in real time through the monitor to be referred by an operator.
In the embodiment, various valves, water pumps and the like can be automatically started and stopped, and the valves and the water pumps are started and stopped according to the operation mode by automatically selecting the operation mode by monitoring the internal temperature of the solar heat collection plate, the internal temperature of the partition heat storage tank, the temperature of the cross-season heat storage pool, the temperature of the greenhouse and the like; meanwhile, the start and stop control of the valves and the water pumps can be realized through the control terminal by various valves and water pumps.
In the embodiment, the flexibility of temperature regulation of the cross-season heat storage pool and the greenhouse system is improved and the operation mode is optimized by coupling the short-term partition heat storage tank; and the industrial waste heat is recycled, the traditional electric energy and fossil fuel are replaced to supply heat to the greenhouse at the end of the heat supply season, and the internal temperature of the greenhouse is ensured to be always suitable for crop growth while the utilization rate of the industrial waste heat energy is improved.
In further embodiments, there is also provided a method for operating the solar long-short term coupled heat storage based multi-energy complementary greenhouse system as described in embodiment 1, including:
starting a relevant valve and a circulating water pump according to the temperatures of the cross-season heat storage pool and the partition heat storage tank, and heating the stored water in the cross-season heat storage pool and the partition heat storage tank through a solar heat collection plate;
and starting related valves and a circulating water pump according to the temperature in the greenhouse system and the required temperature, and supplying heat to the greenhouse system through the hot water in the season-crossing heat storage tank and the partition heat storage tank.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. Multi-energy complementary greenhouse system based on solar long-term and short-term coupling heat storage is characterized by comprising: the heat collection subsystem, the heat storage subsystem and the heat supply subsystem;
the heat collection subsystem comprises a solar heat collection plate;
the heat storage subsystem comprises a cross-season heat storage pool and a partition heat storage tank; the outlet end of the solar heat collecting plate is respectively connected with the season-crossing heat storage pool and the first inlet of the partition plate heat storage tank, and the inlet end of the solar heat collecting plate is respectively connected with the season-crossing heat storage pool and the first outlet of the partition plate heat storage tank, so that the stored water in the season-crossing heat storage pool and the partition plate heat storage tank is heated through the solar heat collecting plate according to the temperatures of the season-crossing heat storage pool and the partition plate heat storage tank;
the heating subsystem comprises a greenhouse system; the second outlets of the cross-season heat storage pool and the partition heat storage tank are respectively connected with a first inlet and a second inlet of the greenhouse system, and the second inlets of the cross-season heat storage pool and the partition heat storage tank are respectively connected with a first outlet and a second outlet of the greenhouse system; the greenhouse system is supplied with heat through the hot water in the cross-season heat storage tank and the partition heat storage tank.
2. The solar long-short term coupling heat storage based multi-energy complementary greenhouse system as claimed in claim 1, wherein the outlet end of the solar heat collection plate is connected with a first water circulation pump and a second water circulation pump through a first three-way valve respectively, the first water circulation pump is connected with a first inlet of the seasonal heat storage tank through a first electronic valve, and the second water circulation pump is connected with a first inlet of the partition heat storage tank through a second electronic valve;
the inlet end of the solar heat collection plate is respectively connected with the partition heat storage tank and the first outlet of the cross-season heat storage pool through a second three-way valve, and a third circulating water pump is arranged between the second three-way valve and the first outlet of the cross-season heat storage pool.
3. The solar long-short term coupling heat storage-based multi-energy complementary greenhouse system as claimed in claim 2, wherein when the temperature in the cross-season heat storage tank is lower than the temperature of the solar heat collection plate and the temperature difference value is greater than the temperature difference threshold value, the stored water in the cross-season heat storage tank flows into the solar heat collection plate by starting the third circulating water pump and the second three-way valve, and after being heated by the solar heat collection plate, the stored water flows into the cross-season heat storage tank by starting the first three-way valve, the first circulating water pump and the first electronic valve;
and when the temperature of the water in the cross-season heat storage tank is lower than that of the solar heat collection plate and the temperature difference value is smaller than the temperature difference threshold value, the first circulating water pump, the first electronic valve and the third circulating water pump are closed.
4. The solar long-short term coupling heat storage based multi-energy complementary greenhouse system as claimed in claim 2, wherein when the temperature in the partition heat storage tank is lower than the temperature of the solar heat collection plate and the temperature difference value is greater than the temperature difference threshold value, the stored water in the partition heat storage tank flows into the solar heat collection plate by starting the second three-way valve, and after being heated by the solar heat collection plate, the stored water flows into the partition heat storage tank by starting the first three-way valve, the second water circulation pump and the second electronic valve;
and when the temperature in the partition heat storage tank is lower than that of the solar heat collection plate and the temperature difference value is smaller than the temperature difference threshold value, closing the second circulating water pump and the second electronic valve.
5. The solar long and short term coupled thermal storage based multi-energy complementary greenhouse system of claim 1 wherein the cross-season thermal storage tank is in an inverted trapezoidal structure;
paving an anti-seepage material inside the cross-season heat storage tank;
a movable heat insulation plate is arranged in the clapboard heat storage tank;
and the tank wall of the clapboard heat storage tank is provided with heat insulation paint.
6. The solar long-short term coupling heat storage based multi-energy complementary greenhouse system of claim 1, wherein the second outlet of the seasonal heat storage tank is connected to the first inlet of the greenhouse system through a fourth water circulating pump and a third electronic valve in sequence, and the second inlet of the seasonal heat storage tank is connected to the first outlet of the greenhouse system through a fifth water circulating pump;
and a second outlet of the partition heat storage tank is connected with a second inlet of the greenhouse system sequentially through a sixth circulating water pump and a fourth electronic valve, and the second inlet of the partition heat storage tank is connected with a second outlet of the greenhouse system through a seventh circulating water pump.
7. The solar long-short term coupling heat storage based multi-energy complementary greenhouse system as claimed in claim 6, wherein in the heat collecting stage, when the temperature in the greenhouse system is lower than the temperature threshold, the hot water in the partition heat storage tank flows into the greenhouse system by starting the sixth water circulating pump and the fourth electronic valve, and after heat exchange, the hot water flows into the partition heat storage tank by starting the seventh water circulating pump.
8. The solar long-short term coupling heat storage based multi-energy complementary greenhouse system as claimed in claim 6, wherein in the heating phase, when the temperature inside the greenhouse system is lower than the required temperature, the hot water in the cross-season heat storage tank flows into the greenhouse system by starting the fourth water circulating pump and the third electronic valve, and after heat exchange, the hot water flows into the cross-season heat storage tank by starting the fifth water circulating pump.
9. The solar long and short term coupling heat storage based multi-energy complementary greenhouse system of claim 1, further comprising a waste heat recovery subsystem, wherein the waste heat recovery subsystem comprises an industrial waste heat end and a heat exchanger; the heat exchanger is connected with the industrial waste heat end through an eighth circulating water pump and a ninth circulating water pump, and the heat exchanger is connected with the greenhouse system through a tenth circulating water pump and a fifth electronic valve;
and starting an eighth circulating water pump, exchanging heat between the heat from the industrial waste heat end and circulating water for heating in the heat exchanger, starting a fifth electronic valve after heat exchange, conveying the heated circulating water into the greenhouse system through a tenth circulating water pump, and conveying the heat-exchanged working medium in the heat exchanger back to the industrial waste heat end through a ninth circulating water pump.
10. The working method of the solar long-short term coupling heat storage based multi-energy complementary greenhouse system of any one of claims 1 to 9, which comprises the following steps:
according to the temperatures of the cross-season heat storage pool and the partition heat storage tank, starting related valves and circulating water pumps, and heating the stored water in the cross-season heat storage pool and the partition heat storage tank through a solar heat collection plate;
and starting related valves and a circulating water pump according to the temperature in the greenhouse system and the required temperature, and supplying heat to the greenhouse system through the hot water in the season-crossing heat storage tank and the partition heat storage tank.
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