CN115076752A - Heat supply system of double-heat-source-matched high-low-temperature independent heat storage tank - Google Patents
Heat supply system of double-heat-source-matched high-low-temperature independent heat storage tank Download PDFInfo
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- CN115076752A CN115076752A CN202210734899.4A CN202210734899A CN115076752A CN 115076752 A CN115076752 A CN 115076752A CN 202210734899 A CN202210734899 A CN 202210734899A CN 115076752 A CN115076752 A CN 115076752A
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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
- F24D11/0221—Central heating systems using heat accumulated in storage masses using heat pumps water heating system combined with solar energy
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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
- F24D19/008—Details related to central heating radiators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- 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
- F24D19/1045—Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses a heat pump and solar energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2200/00—Heat sources or energy sources
- F24D2200/12—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
- F24D2200/00—Heat sources or energy sources
- F24D2200/14—Solar energy
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Abstract
The invention discloses a heating system with double heat sources matched with high-low temperature independent heat storage tanks, which comprises a solar heat collector, an air source heat pump, a solar heat collector circulating pump, a first branch regulating valve, a solar heat collector return water pipeline, a solar heat collector water outlet pipeline, a water supply main pipe first branch, a high-temperature heat storage tank system, a second branch regulating valve, an air source heat pump circulating pump, an air source heat pump return water pipeline regulating valve, a water supply main pipe second branch, an air source heat pump water supply pipeline, an air source heat pump return water pipeline, a low-temperature heat storage tank system, a water return main pipe, a water supply main pipe, a water return main pipe first branch and a water return main pipe second branch. The invention constructs a set of high-temperature and low-temperature independent heat storage tank system, collects and stores redundant heat from clean energy, supplies heat by utilizing solar energy, wind energy or urban off-peak electricity price, and maximizes the utilization rate of renewable energy by matching with the high-temperature and low-temperature heat storage tanks.
Description
Technical Field
The invention relates to the field of energy, in particular to a heat supply system with double heat sources matched with high-low temperature independent heat storage tanks.
Background
At present, the energy consumption for a heating system occupies a large proportion, and the adjustment of an energy structure, the promotion of energy transformation and the increase of the consumption proportion of clean energy have very important significance for realizing carbon peak reaching and carbon neutralization. China has abundant clean energy sources such as wind power resources, solar energy resources and the like, the outdoor design temperature is between-12 ℃ and-6 ℃, the heating time is 120-170 days, the geographical advantages of China can be fully utilized, the consumption proportion of solar energy and air energy for heating is increased, the user requirements are met, and the carbon emission is reduced.
Solar energy is receiving more and more attention as a typical clean energy source, and how to use the solar energy in a heating system to effectively alleviate the energy crisis and reduce carbon emission is becoming a hot spot of the energy industry. However, unstable design of the solar heating system is an important reason for hindering the rapid development of solar heating, and the key problem is to output heat smoothly and continuously to maintain stable heating.
At present, the wind power industry develops rapidly. However, in order to ensure the safety and reliability of the centralized heating in cities and towns, the cogeneration unit operates in a mode of 'fixing power by heat', the minimum power output is restricted by the heating load, the peak shaving capacity of the power grid is reduced, and in the high-power generation period at night in the heating season, in order to ensure the balance of power supply and demand, part of the wind power units are cut off by the power grid, so that the phenomena of 'wind abandoning', low utilization hours of wind power equipment and the like occur, and the phenomena need to be solved urgently.
Therefore, how to utilize the heat storage technology to adjust the imbalance between the heat demand and the heat supply of the user in the heating period, load shifting by peak clipping, overcoming the dislocation of the supply and the demand of different renewable energy sources in time and space, and consuming the renewable energy sources as much as possible has an important role in reducing the heat supply energy consumption.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to solve the technical problem of providing a heat supply system with double heat sources matched with high-low temperature independent heat storage tanks.
The invention provides a heating system of a double-heat-source-matched high-low-temperature independent heat storage tank, which is characterized by comprising a solar heat collector, an air source heat pump, a solar heat collector circulating pump, a first branch regulating valve, a solar heat collector return pipeline, a solar heat collector water outlet pipeline, a water supply main pipe first branch, a high-temperature heat storage tank system, a second branch regulating valve, an air source heat pump circulating pump, an air source heat pump return pipeline regulating valve, a water supply main pipe second branch, an air source heat pump water supply pipeline, an air source heat pump return pipeline, a low-temperature heat storage tank system, a return water main pipe, a water supply main pipe, a return water main pipe first branch and a return water main pipe second branch;
a solar heat collector circulating pump is arranged on the solar heat collector return pipeline, and an outlet of the solar heat collector return pipeline is communicated with an inlet of the solar heat collector; the inlet of a water outlet pipeline of the solar heat collector is communicated with the outlet of the solar heat collector, and the outlet of the water outlet pipeline of the solar heat collector is respectively communicated with the inlet of the first branch of the water supply main pipe and the near heat source end of the high-temperature heat storage tank system; a first branch regulating valve is arranged on the first branch of the water supply main pipe; an inlet of a water return pipeline of the solar heat collector and a far heat source end of the high-temperature heat storage tank system are communicated with an outlet of a first branch of the water return main pipe; a solar heat collector return water pipeline regulating valve is arranged on the first branch of the return water main pipe;
an air source heat pump circulating pump is arranged on the air source heat pump water return pipeline, and an outlet of the air source heat pump water return pipeline is communicated with an inlet of the air source heat pump; an inlet of a water supply pipeline of the air source heat pump is communicated with an outlet of the air source heat pump, and an outlet of the water supply pipeline is respectively communicated with an inlet of a second branch of the water supply main pipe and a near heat source end of the low-temperature heat storage tank system; a second branch regulating valve is arranged on the second branch of the water supply main pipe; an inlet of a return water pipeline of the air source heat pump and a far heat source end of the low-temperature heat storage tank system are communicated with an outlet of a second branch of the return water main pipe; an air source heat pump water return pipeline regulating valve is arranged on the second branch of the water return main pipe;
the inlet of the first branch of the water return main pipe and the inlet of the second branch of the water return main pipe are both communicated with the outlet of the water return main pipe; the inlet of the water return main pipe is communicated with a water return pipeline at the user side;
the outlet of the first branch of the water supply main pipe and the outlet of the second branch of the water supply main pipe are both communicated with the inlet of the water supply main pipe; the outlet of the water supply main pipe is communicated with a user side water supply pipeline.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention constructs a set of high-temperature and low-temperature independent heat storage tank system, collects and stores redundant heat from clean energy, supplies heat by utilizing solar energy, wind energy or urban off-peak electricity price, and maximizes the utilization rate of renewable energy and overcomes the defects of discontinuous and unstable heat supply of the renewable energy by matching with the high-temperature and low-temperature heat storage tanks.
(2) The heat sources of the invention are respectively from a solar heat collector and an air source heat pump. The solar heat collector is matched with the high-temperature heat storage tank, so that when the solar resource condition is good, the solar energy is fully utilized for heat supply, redundant heat can be stored in the high-temperature heat storage tank, and the effective utilization rate of the solar energy is improved. The air source heat pump is matched with the low-temperature heat storage tank, and the wind power is absorbed through electric heat conversion.
(3) The solar collector is matched with the air source heat pump, so that the defect that solar energy cannot continuously supply heat due to unstable solar energy resources and continuous rainy days can be effectively overcome, the utilization rate of clean energy is improved in the heating period, and the heat supply requirement of a user is met.
(4) The low-temperature water generated by the air source heat pump supplies heat at night, so that the heat output of the cogeneration unit is reduced, and the peak shaving capacity of a power grid is improved. The consumed power mainly comes from wind power, so that the utilization rate of wind energy is improved; and can be matched with the urban low ebb electricity price, relieve the power shortage in the urban power utilization peak period and save the operating cost.
(5) The high-temperature and low-temperature heat storage tanks are reasonably regulated and controlled, heat is released when the heat load of a user reaches a peak value, the heat supply system is ensured to operate in a higher power range, the peak clipping and valley filling effects are realized on the heat supply load, and the instability of the operation of the heat supply system is overcome.
Drawings
FIG. 1 is a schematic block diagram of the system connections of the present invention;
fig. 2 is a schematic diagram of a change situation of a heat load in 24 hours of a heat consumer in embodiment 1 of the present invention;
in the figure, a solar heat collector 1, a high-temperature heat storage tank 2, an air source heat pump 3, a low-temperature heat storage tank 4, a user-side water supply line 5, a user-side water return line 6, a solar heat collector circulating pump 7, a first branch regulating valve 8, a high-temperature heat storage tank heat release circulating pump 9, a high-temperature heat storage tank heat storage regulating valve 10, a high-temperature heat storage tank heat storage circulating pump 11, a high-temperature heat storage tank heat release regulating valve 12, a solar heat collector water return line regulating valve 13, a solar heat collector water return line 14, a solar heat collector water outlet line 15, a water supply main pipe first branch 16, a high-temperature heat storage tank system 17, a second branch regulating valve 18, a low-temperature heat storage tank heat storage regulating valve 19, a low-temperature heat storage tank heat release circulating pump 20, an air source heat pump circulating pump 21, a low-temperature heat storage tank heat circulating pump 22, a low-temperature heat storage tank heat release regulating valve 23, an air source heat pump water return line regulating valve 24, a low-temperature heat storage tank heat pump 4, The system comprises a water supply main second branch 25, an air source heat pump water supply line 26, an air source heat pump water return line 27, a low-temperature heat storage tank system 28, a water return main 29, a water supply main 30, a water return main first branch 31 and a water return main second branch 32.
Detailed Description
Specific examples of the present invention are given below. The specific examples are only for illustrating the present invention in further detail and do not limit the scope of the claims of the present invention.
The invention provides a heating system (called heating system for short) with double heat sources matched with high-low temperature independent heat storage tanks, which is characterized by comprising a solar heat collector 1, an air source heat pump 3, a solar heat collector circulating pump 7, a first branch regulating valve 8, a solar heat collector return pipeline regulating valve 13, a solar heat collector return pipeline 14, a solar heat collector water outlet pipeline 15, a water supply main pipe first branch 16, a high-temperature heat storage tank system 17, a second branch regulating valve 18, an air source heat pump circulating pump 21, an air source heat pump return pipeline regulating valve 24, a water supply main pipe second branch 25, an air source heat pump water supply pipeline 26, an air source heat pump return pipeline 27, a low-temperature heat storage tank system 28, a return water main pipe 29, a water supply main pipe 30, a return water main pipe first branch 31 and a return water main pipe second branch 32;
a solar collector circulating pump 7 is arranged on the solar collector return pipeline 14, and the outlet of the solar collector return pipeline 14 is communicated with the inlet of the solar collector 1; an inlet of a water outlet pipeline 15 of the solar heat collector is communicated with an outlet of the solar heat collector 1, and an outlet of the water outlet pipeline is respectively communicated with an inlet of a first branch 16 of a water supply main pipe and a near heat source end of a high-temperature heat storage tank system 17 through a tee joint; a first branch regulating valve 8 is arranged on the first branch 16 of the water supply main pipe; an inlet of a water return pipeline 14 of the solar heat collector and a far heat source end of the high-temperature heat storage tank system 17 are communicated with an outlet of a first branch 31 of a water return main pipe through a tee; a solar heat collector return pipe regulating valve 13 is arranged on the first branch 31 of the return main pipe;
an air source heat pump circulating pump 21 is arranged on the air source heat pump water return pipeline 27, and an outlet of the air source heat pump water return pipeline 27 is communicated with an inlet of the air source heat pump 3; an inlet of a water supply pipeline 26 of the air source heat pump is communicated with an outlet of the air source heat pump 3, and an outlet of the water supply pipeline is respectively communicated with an inlet of a second branch 25 of the water supply main pipe and a near heat source end of a low-temperature heat storage tank system 28 through a tee; the second branch 25 of the water supply main pipe is provided with a second branch regulating valve 18; an inlet of a return water pipeline 27 of the air source heat pump and a far heat source end of the low-temperature heat storage tank system 28 are communicated with an outlet of a second branch 32 of the return water main pipe through a tee joint; an air source heat pump water return pipeline adjusting valve 24 is arranged on the water return main pipe second branch 32;
the inlet of the first branch 31 of the water return main and the inlet of the second branch 32 of the water return main are both communicated with the outlet of the water return main 29 through a tee joint; the inlet of the water return main pipe 29 is communicated with the water return pipeline 6 at the user side;
the outlet of the first branch 16 of the water supply main and the outlet of the second branch 25 of the water supply main are communicated with the inlet of the water supply main 30 through a tee; the outlet of the water supply header 30 communicates with the user-side water supply line 5.
Preferably, the heat in the high-temperature heat storage tank system 17 is only from the solar heat collector 1, can store heat and can release heat, and comprises a high-temperature heat storage tank 2, a high-temperature heat storage tank heat release circulating pump 9, a high-temperature heat storage tank heat storage regulating valve 10, a high-temperature heat storage tank heat storage circulating pump 11 and a high-temperature heat storage tank heat release regulating valve 12;
the outlet of a water outlet pipeline 15 of the solar heat collector is communicated with the near heat source end of the high-temperature heat storage tank 2 through a heat release circulating pump 9 of the high-temperature heat storage tank or a heat storage regulating valve 10 of the high-temperature heat storage tank; the far heat source end of the high-temperature heat storage tank 2 is communicated with the outlet of the first branch 31 of the water return main pipe through a high-temperature heat storage tank heat storage circulating pump 11 or a high-temperature heat storage tank heat release regulating valve 12.
Preferably, the heat in the low-temperature heat storage tank system 28 is only from the air source heat pump 3, can store heat and can release heat, and comprises a low-temperature heat storage tank 4, a temperature heat storage tank heat storage regulating valve 19, a low-temperature heat storage tank heat release circulating pump 20, a low-temperature heat storage tank heat storage circulating pump 22 and a low-temperature heat storage tank heat release regulating valve 23;
the outlet of the air source heat pump water supply pipeline 26 is communicated with the near heat source end of the low-temperature heat storage tank 4 through a temperature heat storage tank heat storage regulating valve 19 or a low-temperature heat storage tank heat release circulating pump 20; the far heat source end of the low-temperature heat storage tank 4 is communicated with the outlet of the water return main pipe second branch 32 through a low-temperature heat storage tank heat storage circulating pump 22 or a low-temperature heat storage tank heat release regulating valve 23.
The four modes of operation of the heating system are as follows, wherein Q 1 For the heating power (W), Q of the solar collector 1 2 For the heat storage power (W) and Q of the high-temperature heat storage tank 2 3 For the heating power (W), Q of the air source heat pump 3 4 The heat storage power (W) and Q of the low-temperature heat storage tank 4 are the heat load required by a user:
in the first mode, when solar energy resources are sufficient, only the solar heat collector 1 is started, and heat generated by the solar heat collector 1 is used for supplying heat to users, so that the heat supply requirements of the users can be met; at this moment, the air source heat pump 3 is closed, the heat supply cost is reduced, and the energy is reasonably utilized:
when the heating power of the solar heat collector 1 is larger than the heat load (i.e. Q) required by the user 1 Q), the solar heat collector 1 supplies heat to users and stores redundant heat in the high-temperature heat storage tank system 17; at the moment, a solar heat collector 1, a solar heat collector circulating pump 7, a high-temperature heat storage tank heat storage circulating pump 11, a solar heat collector return water pipeline adjusting valve 13, a first branch adjusting valve 8 and a high-temperature heat storage tank heat storage adjusting valve 10 are opened; the low-temperature water in the user side water return pipeline 6 flows into the solar heat collector 1 through the water return main pipe 29, the water return main pipe first branch 31 and the solar heat collector water return pipeline 14, and the low-temperature water is heated into high-temperature water at the moment, namely the high-temperature water is heated from the high temperature waterThe solar heat collector 1 flows out; a part of high-temperature water flows into a user-side water supply pipeline 5 through a solar heat collector water outlet pipeline 15, a water supply main pipe first branch 16 and a water supply main pipe 30 to supply heat to users; the other part of high-temperature water flows into the high-temperature heat storage tank 2 through a water outlet pipeline 15 of the solar heat collector and the high-temperature heat storage tank heat storage regulating valve 10, and the part of heat is stored in the high-temperature heat storage tank 2; cold water in the high-temperature heat storage tank 2 enters the solar heat collector 1 through the high-temperature heat storage tank heat storage circulating pump 11 and the solar heat collector water return pipeline 14 to maintain the balance of the water amount in the high-temperature heat storage tank 2;
when the heating power of the solar heat collector 1 is exactly equal to the heat load (i.e. Q) required by the user 1 Q), the solar heat collector 1 only supplies heat to users, and at the moment, the solar heat collector 1, the solar heat collector circulating pump 7, the solar heat collector return water pipeline regulating valve 13 and the first branch regulating valve 8 are opened; the low-temperature water in the user side water return pipeline 6 flows into the solar thermal collector 1 through the water return main pipe 29, the water return main pipe first branch 31 and the solar thermal collector water return pipeline 14, at the moment, the low-temperature water is heated into high-temperature water, flows out of the solar thermal collector 1, and flows into the user side water supply pipeline 5 through the solar thermal collector water outlet pipeline 15, the water supply main pipe first branch 16 and the water supply main pipe 30 to supply heat to users;
when the heating power of the solar heat collector 1 is less than the heat load (i.e. Q) required by the user 1 If the temperature is less than Q), the heat stored in the solar heat collector 1 and the high-temperature heat storage tank system 17 is used for supplying heat to users; at the moment, a solar heat collector 1, a solar heat collector circulating pump 7, a high-temperature heat storage tank heat release circulating pump 9, a solar heat collector return water pipeline regulating valve 13, a high-temperature heat storage tank heat release regulating valve 12 and a first branch regulating valve 8 are opened; part of low-temperature water in the user-side water return pipeline 6 flows into the solar thermal collector 1 through the water return main pipe 29, the water return main pipe first branch 31 and the solar thermal collector water return pipeline 14, at the moment, the low-temperature water is heated into high-temperature water, flows out of the solar thermal collector 1, and flows into the user-side water supply pipeline 5 through the solar thermal collector water outlet pipeline 15, the water supply main pipe first branch 16 and the water supply main pipe 30 to supply heat to users; the other part of low-temperature water passes through the return water main 29, the first branch 31 of the return water main and the high-temperature waterThe heat storage tank heat release regulating valve 12 enters the high-temperature heat storage tank 2, and high-temperature water in the high-temperature heat storage tank 2 flows into the user-side water supply line 5 through the high-temperature heat storage tank heat release circulating pump 9, the first branch 16 of the water supply main and the water supply main 30 to supply heat to users so as to maintain the balance of the water amount in the high-temperature heat storage tank 2.
In the second mode, when no solar energy resource exists in the weather such as at night or in cloudy days, or wind power is consumed by using the air source heat pump 3, or heat is generated by reasonably using the urban valley electricity price so as to save cost, only the air source heat pump 3 is started, and heat generated by the air source heat pump 3 is used for supplying heat to users:
in the second mode, the air source heat pump 3 is started in the valley electricity price time period, the valley electricity price is reasonably utilized, and the cost paid under the same power is relatively small, so that the power of the air source heat pump 3 is improved, and the redundant heat generated by the air source heat pump 3 is stored, so that the heat supply requirement is met in the non-valley electricity price time period.
When the heating power of the air source heat pump 3 is larger than the heat load (namely Q) required by the user 3 Q), the air source heat pump 3 supplies heat to users and stores the redundant heat in the low-temperature heat storage tank system 28; at the moment, the air source heat pump 3, the air source heat pump circulating pump 21, the low-temperature heat storage tank heat storage circulating pump 22, the air source heat pump water return pipeline regulating valve 24, the second branch regulating valve 18 and the low-temperature heat storage tank heat storage regulating valve 19 are opened; the low-temperature water in the user side water return pipeline 6 flows into the air source heat pump 3 through the water return main pipe 29, the water return main pipe second branch 32 and the air source heat pump water return pipeline 27, and at the moment, the low-temperature water is heated into high-temperature water and flows out of the air source heat pump 3; a part of the high-temperature water flows into the user-side water supply pipeline 5 through the air source heat pump water supply pipeline 26, the water supply main pipe second branch 25 and the water supply main pipe 30 to supply heat to the user; the other part of the high-temperature water flows into the low-temperature heat storage tank 4 through the air source heat pump water supply pipeline 26 and the low-temperature heat storage tank heat storage regulating valve 19, and the part of the heat is stored in the low-temperature heat storage tank 4; the cold water in the low-temperature heat storage tank 4 enters the air source heat pump 3 through the low-temperature heat storage tank heat storage circulating pump 22 and the air source heat pump water return pipeline 27 to maintain the balance of the water amount in the low-temperature heat storage tank 4.
When the air sourceThe heating power of the heat pump 3 is exactly equal to the heat load (i.e. Q) required by the user 3 Q), the air source heat pump 3 only supplies heat to the user, and at this time, the air source heat pump 3, the air source heat pump circulating pump 21, the air source heat pump return water line regulating valve 24 and the second branch regulating valve 18 are opened; the low-temperature water in the user side water return pipeline 6 flows into the air source heat pump 3 through the water return main 29, the water return main second branch 32 and the air source heat pump water return pipeline 27, at the moment, the low-temperature water is heated into high-temperature water, flows out of the air source heat pump 3, and flows into the user side water supply pipeline 5 through the air source heat pump water supply pipeline 26, the water supply main second branch 25 and the water supply main 30 to supply heat to the user.
When the heating power of the air source heat pump 3 is less than the heat load (i.e. Q) required by the user 3 If Q), the heat stored in the air source heat pump 3 and the low-temperature heat storage tank system 28 is used for supplying heat to users; at the moment, the air source heat pump 3, the air source heat pump circulating pump 21, the low-temperature heat storage tank heat release circulating pump 20, the air source heat pump water return pipeline regulating valve 24, the second branch regulating valve 18 and the low-temperature heat storage tank heat release regulating valve 23 are opened; part of low-temperature water in the user-side water return pipeline 6 flows into the air source heat pump 3 through the water return main 29, the water return main second branch 32 and the air source heat pump water return pipeline 27, at the moment, the low-temperature water is heated into high-temperature water, flows out of the air source heat pump 3, and flows into the user-side water supply pipeline 5 through the air source heat pump water supply pipeline 26, the water supply main second branch 25 and the water supply main 30 to supply heat to a user; the other part of low-temperature water enters the low-temperature heat storage tank 4 through the water return header pipe 29, the water return header pipe second branch 32 and the low-temperature heat storage tank heat release regulating valve 23, and the high-temperature water in the low-temperature heat storage tank 4 flows into the user-side water supply line 5 through the low-temperature heat storage tank heat release circulating pump 20, the water supply header pipe second branch 25 and the water supply header pipe 30 to supply heat to the user, so that the balance of the water amount in the low-temperature heat storage tank 4 is maintained.
And in the third mode, if the solar energy resources are sufficient and the air source heat pump 3 can meet the heat supply demand of the user by consuming lower cost such as wind power or urban low-valley electricity price, the solar heat collector 1 and the air source heat pump 3 are started simultaneously (namely Q) 1 ＞0，Q 3 > 0), heat is supplied to users by utilizing the heat generated by the lower-cost air source heat pump 3,and stores the heat generated by the solar collector 1 to reduce the overall heating cost in the heating process:
in the third mode, renewable energy is fully utilized, clean and low-cost heat generated by the solar heat collector 1 can be stored, and the heat generated by the air source heat pump 3 can be utilized to meet the requirement at a low cost. When the whole heating system needs to consume the urban peak electricity and the like to supply heat with relatively high cost, the stored low-cost heat generated by the solar heat collector 1 can be used for supplying heat, so that the heating cost in the whole heating period is reduced.
When the heating power of the air source heat pump 3 is larger than the heat load (namely Q) required by the user 3 > Q and Q 1 More than 0), the heat in the solar heat collector 1 is completely stored in the high-temperature heat storage tank system 17, and the air source heat pump 3 supplies heat to users and simultaneously stores the redundant heat in the low-temperature heat storage tank system 28; at the moment, a solar thermal collector 1, a solar thermal collector circulating pump 7, a high-temperature heat storage tank heat storage circulating pump 11, a solar thermal collector return water pipeline regulating valve 13, a high-temperature heat storage tank heat storage regulating valve 10, an air source heat pump 3, an air source heat pump circulating pump 21, a low-temperature heat storage tank heat storage circulating pump 22, an air source heat pump return water pipeline regulating valve 24, a second branch regulating valve 18 and a low-temperature heat storage tank heat storage regulating valve 19 are opened; a part of low-temperature water in the user side water return pipeline 6 flows into the solar heat collector 1 through the water return main pipe 29, the water return main pipe first branch 31 and the solar heat collector water return pipeline 14, at the moment, the low-temperature water is heated into high-temperature water, the high-temperature water flows out of the solar heat collector 1, flows into the high-temperature heat storage tank 2 through the solar heat collector water outlet pipeline 15 and the high-temperature heat storage tank heat storage regulating valve 10, and the part of heat is stored in the high-temperature heat storage tank 2; cold water in the high-temperature heat storage tank 2 enters the solar heat collector 1 through the high-temperature heat storage tank heat storage circulating pump 11 and the solar heat collector water return pipeline 14 to maintain the water quantity balance in the high-temperature heat storage tank 2; the other part of low-temperature water in the user side water return pipeline 6 flows into the air source heat pump 3 through the water return main pipe 29, the water return main pipe second branch 32 and the air source heat pump water return pipeline 27, at the moment, the low-temperature water is heated into high-temperature water, and the high-temperature water flows out of the air source heat pump 3; from the air-source heat pump 3A part of the high-temperature water flows into the user-side water supply pipeline 5 through the air source heat pump water supply pipeline 26, the water supply main pipe second branch 25 and the water supply main pipe 30 to supply heat to the user; another part of the high-temperature water flowing out of the air source heat pump 3 flows into the low-temperature heat storage tank 4 through the air source heat pump water supply line 26 and the low-temperature heat storage tank heat storage regulating valve 19, and the part of the heat is stored in the low-temperature heat storage tank 4; cold water in the low-temperature heat storage tank 4 enters the air source heat pump 3 through the low-temperature heat storage tank heat storage circulating pump 22 and the air source heat pump water return pipeline 27 to maintain the balance of the water amount in the low-temperature heat storage tank 4;
when the heating power of the air source heat pump 3 just meets the heat load (namely Q) required by the user 3 Q and Q 1 More than 0), the heat in the solar heat collector 1 is completely stored in the high-temperature heat storage tank system 17, and the air source heat pump 3 only supplies heat to users; at the moment, a solar heat collector 1, a solar heat collector circulating pump 7, a high-temperature heat storage tank heat storage circulating pump 11, a solar heat collector return water pipeline adjusting valve 13, a high-temperature heat storage tank heat storage adjusting valve 10, an air source heat pump 3, an air source heat pump circulating pump 21, an air source heat pump return water pipeline adjusting valve 24 and a second branch adjusting valve 18 are opened; a part of low-temperature water in the user side water return pipeline 6 flows into the solar heat collector 1 through the water return main pipe 29, the water return main pipe first branch 31 and the solar heat collector water return pipeline 14, at the moment, the low-temperature water is heated into high-temperature water, the high-temperature water flows out of the solar heat collector 1, flows into the high-temperature heat storage tank 2 through the solar heat collector water outlet pipeline 15 and the high-temperature heat storage tank heat storage regulating valve 10, and the part of heat is stored in the high-temperature heat storage tank 2; cold water in the high-temperature heat storage tank 2 enters the solar heat collector 1 through the high-temperature heat storage tank heat storage circulating pump 11 and the solar heat collector water return pipeline 14 to maintain the water quantity balance in the high-temperature heat storage tank 2; the other part of low-temperature water in the user-side water return pipeline 6 flows into the air source heat pump 3 through the water return main 29, the water return main second branch 32 and the air source heat pump water return pipeline 27, at the moment, the low-temperature water is heated into high-temperature water, the high-temperature water flows out of the air source heat pump 3 and flows into the user-side water supply pipeline 5 through the air source heat pump water supply pipeline 26, the water supply main second branch 25 and the water supply main 30 to supply heat to the user;
when the heating power of the air source heat pump 3 is lowAt the user's desired thermal load (i.e. Q) 3 < Q and Q 1 More than 0), the heat in the solar heat collector 1 is completely stored in the high-temperature heat storage tank system 17, and the heat stored in the air source heat pump 3 and the low-temperature heat storage tank system 28 is used for supplying heat to users; at the moment, a solar heat collector 1, a solar heat collector circulating pump 7, a high-temperature heat storage tank heat storage circulating pump 11, a solar heat collector return water pipeline adjusting valve 13, a high-temperature heat storage tank heat storage adjusting valve 10, an air source heat pump 3, an air source heat pump circulating pump 21, a low-temperature heat storage tank heat release circulating pump 20, an air source heat pump return water pipeline adjusting valve 24, a second branch adjusting valve 18 and a low-temperature heat storage tank heat release adjusting valve 23 are opened; a part of low-temperature water in the user side water return pipeline 6 flows into the solar heat collector 1 through the water return main pipe 29, the water return main pipe first branch 31 and the solar heat collector water return pipeline 14, at the moment, the low-temperature water is heated into high-temperature water, the high-temperature water flows out of the solar heat collector 1, flows into the high-temperature heat storage tank 2 through the solar heat collector water outlet pipeline 15 and the high-temperature heat storage tank heat storage regulating valve 10, and the part of heat is stored in the high-temperature heat storage tank 2; cold water in the high-temperature heat storage tank 2 enters the solar heat collector 1 through the high-temperature heat storage tank heat storage circulating pump 11 and the solar heat collector water return pipeline 14 to maintain the water quantity balance in the high-temperature heat storage tank 2; part of the low-temperature water in the user-side water return pipeline 6 flows into the air source heat pump 3 through the water return main 29, the water return main second branch 32 and the air source heat pump water return pipeline 27, at the moment, the low-temperature water is heated into high-temperature water, flows out of the air source heat pump 3, and flows into the user-side water supply pipeline 5 through the air source heat pump water supply pipeline 26, the water supply main second branch 25 and the water supply main 30 to supply heat to the user; the residual low-temperature water in the user side water return pipeline 6 enters the low-temperature heat storage tank 4 through the water return header pipe 29, the water return header pipe second branch 32 and the low-temperature heat storage tank heat release regulating valve 23, and the high-temperature water in the low-temperature heat storage tank 4 flows into the user side water supply pipeline 5 through the low-temperature heat storage tank heat release circulating pump 20, the water supply header pipe second branch 25 and the water supply header pipe 30 to supply heat to the user so as to maintain the balance of the water amount in the low-temperature heat storage tank 4;
mode four, if solar energy resource lacks, and is in during the urban peak power consumption, starts air source heat pump 3 this moment and can produce higher heat supply cost, then closes solar collector 1 and air source heat pump 3 simultaneously, utilizes the heat that high temperature heat accumulation jar system 17 and low temperature heat accumulation jar system 28 stored to jointly supply heat to the user:
supplying heat (i.e., Q) to a user using the heat stored in the high-temperature and low-temperature heat storage tanks 2 and 4 1 ＝0，Q 3 ＝0，Q 2 +Q 4 > Q); at the moment, a solar heat collector return water pipeline regulating valve 13, a high-temperature heat storage tank heat release regulating valve 12, a high-temperature heat storage tank heat release circulating pump 9, a first branch regulating valve 8, an air source heat pump return water pipeline regulating valve 24, a low-temperature heat storage tank heat release regulating valve 23, a low-temperature heat storage tank heat release circulating pump 20 and a second branch regulating valve 18 are opened; a part of low-temperature water in the user-side water return pipeline 6 enters the high-temperature heat storage tank 2 through the water return header pipe 29, the water return header pipe first branch 31 and the high-temperature heat storage tank heat release regulating valve 12, and high-temperature water in the high-temperature heat storage tank 2 flows into the user-side water supply pipeline 5 through the high-temperature heat storage tank heat release circulating pump 9, the water supply header pipe first branch 16 and the water supply header pipe 30 to supply heat to users so as to maintain the balance of water in the high-temperature heat storage tank 2; the other part of the low-temperature water in the user side water return pipeline 6 enters the low-temperature heat storage tank 4 through the water return header pipe 29, the water return header pipe second branch 32 and the low-temperature heat storage tank heat release regulating valve 23, and the high-temperature water in the low-temperature heat storage tank 4 flows into the user side water supply pipeline 5 through the low-temperature heat storage tank heat release circulating pump 20, the water supply header pipe second branch 25 and the water supply header pipe 30 to supply heat to the user, so that the balance of the water amount in the low-temperature heat storage tank 4 is maintained.
Example 1
(1) Energy conservation of heating system operation:
in the early and final cold periods of the heat supply period, the outdoor environment temperature is relatively high, in order to reach the indoor design temperature of a user, the heat required by the heat supply system is small, the solar environmental condition is good in the daytime, at the moment, the solar heat collector 1 can be used for supplying heat, the heat supply requirement of the user in the daytime can be maintained, and the redundant heat can be collected into the high-temperature heat storage tank 2; when solar collector 1 can't work at night, can initiatively pass through air source heat pump 3 cooperation low ebb electricity price and take up wind-powered electricity generation heat supply to satisfy user's demand. At the moment, a heat supply mode that only the solar heat collector 1 supplies heat when the solar resource condition is good and only the air source heat pump 3 supplies heat at night is adopted.
Suppose the heating power Q of the solar collector 1 1 Is 1.5MW, the heating power Q of the air source heat pump 3 3 Is a maximum of 2 MW. The urban commercial electricity prices and the off-peak electricity prices are 0.7 and 0.3 yuan/kWh, respectively (off-peak electricity price time period is 22:00-7: 00).
The change rule of the heat load Q required by the user in the day is shown in FIG. 2: in a conventional operation mode, if the solar heat collector 1 works for 8 hours in one day and the air source heat pump 3 works for 16 hours in one day, the heat supply power of the solar heat collector 1 stably operates according to 1.5MW, and the output heat is 4.32 × 10 7 kJ, since the heating power is greater than the user's required heat load Q at this time, the calculated surplus heat quantity Δ Q is 1.5MWh (5.4 × 10) 6 kJ), as indicated by the shaded portion in fig. 2, may be stored in the high-temperature heat storage tank 2.
In the working process of the air source heat pump 3, if the working time is not within the specified time of the urban valley electricity price, the air source heat pump operates according to the heat supply power of 1.8MW, and the rest time operates according to the power of 2MW, the heat can be output by 1.1 multiplied by 10 in the whole operation process 8 kJ, calculated caloric abundance of 2.2MWh (7.92X 10) 6 kJ)。
Compared with the conventional solar energy-air source heat pump system without a heat storage device, under the condition that the heat load Q required by the same user is changed (shown in fig. 2), in order to meet the heat supply requirement, the heat supply power of the solar heat collector 1 is 1.4MW, the heat supply power of the air source heat pump 3 is 1.9MW, and the two are required to be stably operated at the same time, and the output heat of the solar heat collector 1 is about 11.2MWh (4.032 × 10) 7 kJ), the output heat of the air source heat pump 3 is about 29.8MWh (1.0728 × 10) 8 kJ)。
In summary, the heat generation amounts of the conventional solar-air source heat pump system without the heat storage device and the heating system of the present invention are shown in table 1:
TABLE 1
As can be seen from Table 1Compared with the conventional solar energy-air source heat pump system without a heat storage device, the solar energy-air source heat pump system can save heat by 1.332 multiplied by 10 within 24h in the heating period 7 kJ, about 7.9 percent of the total heat is saved, and abundant heat is stored in the heat storage tank, so that heat is continuously and stably provided for users, and the peak value of the heat supply load is reduced.
(2) Economy of the high-temperature heat storage tank 2 and the low-temperature heat storage tank 4:
assuming that the maximum heat supply output of the heat supply system is 0.6MW, and the maximum heat load required by users in the daytime and the maximum heat load required by users at night are 0.6MW according to the operation mode in the step (1), the rated heat supply power of the selective solar heat collector 1 is about 0.4MW, the rated heat supply power of the air source heat pump 3 is about 0.6MW, the return water temperature of the user side is 45 ℃, the heat storage temperature of the high-temperature heat storage tank 2 is about 90 ℃, and the heat storage temperature of the low-temperature heat storage tank 4 is 60 ℃.
a. The capacity of the water tank is calculated according to the unit bearing 100% of load (calculated according to the worst condition in the calculation process). The designed heat storage capacity of the high-temperature heat storage tank 2 is about 2MWh, the designed heat storage capacity of the low-temperature heat storage tank 4 is 5MWh, and considering that the heat storage capacity of the heat storage tanks is 87%, Q2 is 2.3MWh, and Q4 is 5.75 MWh.
b. When V is 860Q/1000/. DELTA.t, the design capacity V of the high-temperature heat storage tank 2 is set 2 ＝44m 3 Designed capacity V of the low-temperature heat storage tank 4 4 ＝330m 3 。
c. In the design process:
the first scheme is as follows: if the heat storage tank is configured only as the high-temperature heat storage tank 2, about 153m is required as calculated by the above equation 3 The cost for heating the low-temperature water is additionally paid by Q-cm delta t, m-rho v and rho-1000 kg/m 3 C is the specific heat capacity of water 4.2X 10 3 J/(kg. DEG C), heat price is calculated as 40 yuan/GJ, then storing the low temperature water in the original low temperature heat storage tank 4 into the high temperature heat storage tank 2 will require additional payment of M3 as 2165 yuan, and the high temperature heat storage tank system 17 is relatively expensive, according to Prv1 which is 5000 yuan/M 3 And calculating, the cost of the high-temperature heat storage tank system 17 is 76.5 ten thousand yuan. If in a heating period (calculated according to 130 days), the heat storage tank is used in the heating period through reasonable heat storage and heat releaseWhen the house provides 373.75MWh heat, the initial investment and the operating cost of the heat storage system in the first year are 90.5 ten thousand yuan.
Scheme II: if the heat storage tank is configured only as the low-temperature heat storage tank 4, 460m is required as calculated by the above formula 3 According to the manufacturing cost Prv2 of the low-temperature heat storage tank system 28 being 2000 yuan/m 3 And calculating to obtain the low-temperature heat storage tank with the cost of 92 ten thousand yuan.
The third scheme is as follows: if the heat storage tanks are respectively provided with the high-temperature heat storage tank 2 and the low-temperature heat storage tank 4, the manufacturing cost Prv1 is 5000 yuan/m according to the high-temperature heat storage tank system 17 3 The cost of the low-temperature heat storage tank system 28 is Prv 2-2000 yuan/m 3, and 88 ten thousand yuan is needed.
The second scheme and the third scheme do not need to bear the heating cost of the low-temperature water, the initial investment and the operating cost of the heat storage system in the first year are only the manufacturing cost of the heat storage tank, but the occupied area of the low-temperature heat storage tank is large, and whether the low-temperature heat storage tank has enough use area or not needs to be considered during design, and the investment cost of the use area is borne.
In summary, compared with the configuration of only the high-temperature heat storage tank 2 or only the low-temperature heat storage tank 4, the configuration of both the high-temperature heat storage tank 2 and the low-temperature heat storage tank 4 can bring considerable economic benefits while meeting the heat requirement.
Nothing in this specification is said to apply to the prior art.
Claims (3)
1. A heating system with double heat sources matched with high-low temperature independent heat storage tanks is characterized by comprising a solar heat collector, an air source heat pump, a solar heat collector circulating pump, a first branch regulating valve, a solar heat collector return water pipeline, a solar heat collector water outlet pipeline, a water supply main pipe first branch, a high-temperature heat storage tank system, a second branch regulating valve, an air source heat pump circulating pump, an air source heat pump return water pipeline regulating valve, a water supply main pipe second branch, an air source heat pump water supply pipeline, an air source heat pump return water pipeline, a low-temperature heat storage tank system, a water return main pipe, a water supply main pipe, a water return main pipe first branch and a water return main pipe second branch;
a solar heat collector circulating pump is arranged on the solar heat collector return pipeline, and an outlet of the solar heat collector return pipeline is communicated with an inlet of the solar heat collector; the inlet of a water outlet pipeline of the solar heat collector is communicated with the outlet of the solar heat collector, and the outlet of the water outlet pipeline of the solar heat collector is respectively communicated with the inlet of the first branch of the water supply main pipe and the near heat source end of the high-temperature heat storage tank system; a first branch regulating valve is arranged on the first branch of the water supply main pipe; an inlet of a water return pipeline of the solar heat collector and a far heat source end of the high-temperature heat storage tank system are communicated with an outlet of a first branch of the water return main pipe; a solar heat collector return water pipeline regulating valve is arranged on the first branch of the return water main pipe;
an air source heat pump circulating pump is arranged on the air source heat pump water return pipeline, and an outlet of the air source heat pump water return pipeline is communicated with an inlet of the air source heat pump; the inlet of a water supply pipeline of the air source heat pump is communicated with the outlet of the air source heat pump, and the outlet of the water supply pipeline is respectively communicated with the inlet of the second branch of the water supply main pipe and the near heat source end of the low-temperature heat storage tank system; a second branch regulating valve is arranged on the second branch of the water supply main pipe; an inlet of a return water pipeline of the air source heat pump and a far heat source end of the low-temperature heat storage tank system are communicated with an outlet of a second branch of the return water main pipe; an air source heat pump water return pipeline regulating valve is arranged on the second branch of the water return main pipe;
the inlet of the first branch of the water return main pipe and the inlet of the second branch of the water return main pipe are both communicated with the outlet of the water return main pipe; the inlet of the water return main pipe is communicated with a water return pipeline at the user side;
the outlet of the first branch of the water supply main pipe and the outlet of the second branch of the water supply main pipe are both communicated with the inlet of the water supply main pipe; the outlet of the water supply main pipe is communicated with a user side water supply pipeline.
2. The heating system of claim 1, wherein the high-temperature heat storage tank system comprises a high-temperature heat storage tank, a high-temperature heat storage tank heat release circulating pump, a high-temperature heat storage tank heat storage regulating valve, a high-temperature heat storage tank heat storage circulating pump and a high-temperature heat storage tank heat release regulating valve;
the outlet of the water outlet pipeline of the solar heat collector is communicated with the near-heat source end of the high-temperature heat storage tank through a heat release circulating pump of the high-temperature heat storage tank or a heat storage regulating valve of the high-temperature heat storage tank; and the far heat source end of the high-temperature heat storage tank is communicated with the outlet of the first branch of the water return main pipe through a high-temperature heat storage tank heat storage circulating pump or a high-temperature heat storage tank heat release regulating valve.
3. The heating system of claim 1, wherein the low-temperature heat storage tank system comprises a low-temperature heat storage tank, a warm heat storage tank heat storage regulating valve, a low-temperature heat storage tank heat release circulating pump, a low-temperature heat storage tank heat storage circulating pump and a low-temperature heat storage tank heat release regulating valve;
an outlet of the air source heat pump water supply pipeline is communicated with a near-heat source end of the low-temperature heat storage tank through a heat storage regulating valve of the low-temperature heat storage tank or a heat release circulating pump of the low-temperature heat storage tank; and the far heat source end of the low-temperature heat storage tank is communicated with the outlet of the second branch of the water return header pipe through a heat storage circulating pump of the low-temperature heat storage tank or a heat release regulating valve of the low-temperature heat storage tank.
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