CN106765456A - A kind of hold over system and timesharing accumulation of heat co-feeding system - Google Patents

Abstract

The invention provides a heat storage system and a time-sharing heat storage combined supply system, and relates to the technical field of heating and heating. The heat storage system includes a heat storage loop on the primary side; a main heat source assembly, a heat storage circulation pump, a three-way control valve, a first heat exchanger, a heat storage tank, a first valve, second valve, third valve and fourth valve. The time-sharing thermal storage cogeneration system includes the above-mentioned thermal storage system, a solar heat collector, a thermal collector circulation pump, a second heat exchanger, and a heat exchange circulation pump. The heat storage system of the present invention reduces the failure rate and operating cost due to the simplification of the equipment in the pipeline, and the control is simple to achieve energy saving and emission reduction; while the time-sharing heat storage and cogeneration system uses solar energy combined with traditional energy, which can be used Renewable energy collects and stores heat in time-sharing, which solves the problem of insufficient heating of the heat storage tank during the daytime.

Description

A thermal storage system and a time-sharing thermal storage cogeneration system

technical field

The invention relates to the technical field of heating and heating, in particular to a heat storage system and a time-sharing heat storage combined supply system.

Background technique

With the increasing development of social economy, the energy consumption of all walks of life is rising steadily, and energy conservation and emission reduction have become the consensus of the public. Energy-consuming industries and trades such as construction and mechanical and electrical industries are developing in the direction of energy saving, reliability, and investment reduction.

As we all know, the electric hot water boiler system has the advantages of low noise, no emission, high thermal efficiency, high degree of automation, and simple operation, but it also has disadvantages such as high operating cost and large operating condition restrictions. It is still widely used in places lacking central heating, gas, coal, fuel oil and other restricted places and important scientific research laboratories.

At present, there are two common types of heat storage and heat supply systems for electric hot water boilers. Figure 1 is a process flow diagram of the heat storage system scheme 1 in the prior art; Figure 2 is a process flow diagram of the heat storage system scheme 1 in the prior art. As shown in Figure 1, the first type of system has four electric valves 22 and a set of circulating drive pump 23 on the primary side, which can realize the functions of heat storage and heat supply, electric boiler heat supply alone, and hot water storage tank alone heat supply . As shown in Fig. 2, the second system is provided with an electric three-way regulating valve and two sets of circulating drive pumps 23, which can also realize the above functions.

However, the heat storage and heat supply system of the above-mentioned first type of electric hot water boiler has more electric valves 22, and its functions are simple and cannot solve the problem of mismatching energy supply and demand time and insufficient heat supply of the heat storage tank during the daytime; the above-mentioned second type of electric water boiler Although the structure of the thermal storage heating system is simplified by reducing the electric control valve, a group of thermal storage circulation pumps are added to the system, which increases the energy consumption of the pump system. In addition, the traditional thermal storage electric boiler system relies on high-grade electric energy and does not make full use of low-grade energy, resulting in high operating costs.

Contents of the invention

The purpose of the present invention is to provide a heat storage system and a time-sharing heat storage and cogeneration system to solve the problem of high failure rate, high operating cost and heat supply of the heat storage tank during the daytime in the electric boiler heat storage heat supply system in the prior art. Insufficient problem.

In order to achieve the above object, the present invention adopts the following technical solutions:

A heat storage system provided by the present invention includes a heat storage loop on a primary side; a main heat source component, a heat storage circulation pump, a three-way control valve, a first heat exchanger, a heat storage The hot water tank, the first valve, the second valve, the third valve and the fourth valve; the main heat source assembly, the heat storage circulation pump, the three-way control valve, the first heat exchanger and the The first valve is connected through pipelines to form a closed loop; the main heat source assembly, the heat storage circulation pump, the three-way control valve, the first heat exchanger, the second valve, and the heat storage tank The main heat source assembly, the heat storage circulation pump, the three-way control valve, the third valve, the heat storage tank and the fourth valve are connected through pipelines to form a closed loop; The valves are connected through pipelines to form a closed circuit.

Preferably, the main heat source component is an electric boiler or a heat pump. The technical effect of this technical solution lies in: the electric hot water boiler is a conventional heating equipment, its production cost is relatively low, its technical conditions are mature, and its operation and maintenance costs are also lower; heat pump technology is a new energy source that has attracted much attention in the world in recent years Common types include air source heat pumps, water source heat pumps, ground source heat pumps and dual source heat pumps, which have many advantages such as high efficiency, energy saving, environmental protection, and safety.

The present invention also provides a time-sharing heat storage cogeneration system, which includes a primary-side auxiliary heat storage loop and the above-mentioned heat storage system; the primary-side auxiliary heat storage loop includes a solar heat collector, a heat collection circulation pump, a second Two heat exchangers, a heat exchange circulation pump; the solar heat collector, the heat collection circulation pump and the second heat exchanger are connected through pipelines to form a closed loop; the heat storage tank, the heat exchange circulation The pump and the second heat exchanger are connected through pipelines to form a closed circuit.

Further, the time-sharing heat storage cogeneration system further includes a liquid replenishment tank and a liquid replenishment pump, and the liquid replenishment tank communicates with the closed circuit where the solar heat collector is located through the liquid replenishment pump. The technical effect of this technical solution is that: due to the possible leakage and evaporation of the flowing heat medium, the loss is reduced. The function of the liquid replenishment tank and the liquid replenishment pump is to replenish sufficient heat medium in time to ensure the normal operation of heat collection and heat exchange in the circuit. run.

Further, the time-sharing heat storage cogeneration system further includes an expansion tank, and the expansion tank communicates with the closed circuit where the solar heat collector is located. The technical effect of this technical solution is that the function of the expansion tank is to absorb the volume of the expansion tank when the temperature of the working medium rises and the volume expands, so as to prevent the pressure in the circuit from rising too fast, and release the liquid in the tank when the temperature of the working medium decreases and the volume shrinks Supplement to the circuit to avoid the circuit pressure drop too fast, so as to reduce the number of pressure relief of the safety valve and the number of work of the replenishment pump.

Further, the time-sharing heat storage cogeneration system also includes a first heat meter, a second heat meter and a control assembly; the first heat meter is located in the closed loop where the solar collector is located; the second heat meter is located in the The closed circuit where the heat exchange circulation pump is located; the control component is respectively connected to the first heat meter, the second heat meter and the heat exchange circulation pump. The technical effect of this technical solution is that a control component is set in the closed loop where the solar heat collector is located, and is used to adjust the starting frequency and time of the heat exchange circulation pump according to the heat exchange temperature difference measured by the first heat meter and the second heat meter.

Preferably, the solar heat collector is a flat plate, all-glass vacuum tube or U-shaped tube heat collector. The technical effect of this technical solution is: according to different actual needs, installation conditions and external weather conditions, different solar collectors such as flat plate, all-glass vacuum tube or U-shaped tube can be selected.

Further, the pipeline of the closed circuit where the solar heat collector is located includes a steel pipe, an insulation pipe and an insulation layer in sequence from the inside to the outside. The technical effect of this technical solution is that: the steel pipe can provide sufficient structural strength for the pipeline, reducing the stress caused by system vibration and bending; the heat preservation pipe can reduce the heat loss when the heat medium flows in the pipeline; Fix the insulation pipe, on the other hand, prevent the insulation pipe from being damaged.

Preferably, the insulation pipe is made of flame-retardant rubber and plastic. The technical effect of the technical solution lies in that the flame-retardant rubber and plastic have good thermal insulation performance and are not easy to burn under the high temperature of the heat medium. Moreover, the flame-retardant rubber and plastics do not contain harmful chlorofluorochemicals, which meet the requirements of international environmental protection certification. During the installation process and use, they will not produce any polluting gases that are harmful to human health. Moreover, due to its soft material and no need for other auxiliary layers, the construction and installation are simple and fast.

Preferably, the insulation layer is made of aluminum metal. The technical effect of the technical solution is that the metal aluminum has high mechanical strength, low density, high finish and is not easy to corrode.

The beneficial effects of the present invention are:

1. Three closed loops are formed respectively. Driven by the heat storage circulation pump, the functions of the main heat source components to supply heat alone, the heat storage tank to supply heat alone, and the main heat source components to store heat in the heat storage tank can be realized, and , simplifies the equipment in the pipeline to reduce the failure rate and operating costs, and the control is simple to achieve energy saving and emission reduction.

2. Set up an auxiliary heat storage loop on the primary side outside the heat storage system, which can realize the combination of solar energy and the energy of traditional electric boilers, and use renewable solar energy to collect and store heat in time-sharing, so as to solve the heating problem of the hot water storage tank during the daytime Insufficient problem.

Description of drawings

In order to more clearly illustrate the technical solutions of the specific embodiments of the present invention, the following will briefly introduce the drawings that need to be used in the description of the specific embodiments. Apparently, the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings based on these drawings without creative efforts.

Fig. 1 is the process flow chart of heat storage system scheme 1 in the prior art;

Fig. 2 is the process flow chart of heat storage system scheme 1 in the prior art;

Fig. 3 is a process flow chart of the heat storage loop on the primary side in the heat storage system provided by the present invention;

Fig. 4 is a process flow chart of the auxiliary heat storage loop on the primary side in the heat storage system provided by the present invention;

Fig. 5 is a schematic cross-sectional view of the pipeline in the closed loop of the heat storage system provided by the present invention.

Reference signs:

1-Main heat source assembly; 2-Heat storage circulation pump; 3-Three-way control valve;

4-the first heat exchanger; 5-the heat storage tank; 6-the first valve;

7-Second valve; 8-Third valve; 9-Fourth valve;

10-solar heat collector; 11-heat collecting circulating pump; 12-second heat exchanger;

13-Heat exchange circulation pump; 14-Replenishment tank; 15-Replenishment pump;

16-expansion tank; 17-the first heat meter; 18-the second heat meter;

19-steel pipe; 20-insulation pipe; 21-insulation layer;

22-electric valve; 23-circulation drive pump.

detailed description

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

The present invention provides a heat storage system, wherein: FIG. 3 is a process flow diagram of the primary side heat storage loop in the heat storage system provided by the present invention. As shown in Figure 3, the structure of the heat storage system includes a heat storage loop on the primary side. Specifically, the main heat source assembly 1, the heat storage circulation pump 2, the three-way control valve 3, the first heat exchanger 4, the heat storage tank 5, the first valve 6, and the second valve are sequentially arranged on the heat storage loop on the primary side. 7. The third valve 8 and the fourth valve 9. The main heat source assembly 1, the heat storage circulation pump 2, the three-way control valve 3, the first heat exchanger 4 and the first valve 6 are connected through pipelines to form a closed loop; at the same time, the main heat source assembly 1, the heat storage circulation pump 2, the three-way The control valve 3, the first heat exchanger 4, the second valve 7, the hot water storage tank 5 and the fourth valve 9 are connected through pipelines to form a closed loop; and the main heat source assembly 1, the heat storage circulation pump 2, and the three-way control valve 3. The third valve 8, the hot water storage tank 5 and the fourth valve 9 are connected through pipelines to form a closed circuit.

As shown in FIG. 3 , preferably, the main heat source assembly 1 preferably uses an electric boiler or a heat pump. In this embodiment, the electric hot water boiler is a conventional heating equipment, which has relatively low production costs, mature technical conditions, and low operation and maintenance costs; and heat pump technology is a new energy technology that has attracted much attention in the world in recent years Common types include air source heat pumps, water source heat pumps, ground source heat pumps and dual source heat pumps, which have many advantages such as high efficiency, energy saving, environmental protection, and safety.

It should be noted:

In order to meet the needs of different heating environments, the first heat exchanger 4 can be a plate heat exchanger or a shell-and-tube heat exchanger made of 304 stainless steel with a heat transfer coefficient of 3000kcal/(m2·°C·h).

In order to improve the reliability of the circulation loop, the thermal storage circulation pump 2 may adopt a set of water pumps or multiple sets of water pumps arranged in parallel, and a standby pump set is set among the multiple sets of water pumps.

In order to facilitate the circulation and control of heat medium in the circuit, the three-way control valve 3 is preferably an electric regulating valve, and the first valve 6, the second valve 7, the third valve 8 or the fourth valve 9 is preferably an electric butterfly valve.

The invention also provides a time-sharing heat storage combined power supply system. The time-sharing heat storage cogeneration system includes an auxiliary heat storage loop on the primary side and the above-mentioned heat storage system. Fig. 4 is a process flow chart of the auxiliary heat storage loop on the primary side in the heat storage system provided by the present invention. Specifically, as shown in FIGS. 3 and 4 , the primary-side auxiliary heat storage loop includes a solar heat collector 10 , a heat collection circulation pump 11 , a second heat exchanger 12 , and a heat exchange circulation pump 13 . Its communication relationship and circuit structure are as follows: the solar heat collector 10, the heat collection circulation pump 11 and the second heat exchanger 12 are connected through pipelines to form a closed circuit, and the heat storage tank 5, the heat exchange circulation pump 13 and the second heat exchanger 12 are connected by pipelines to form a closed loop.

In the existing common electric hot water boiler thermal storage heating system, there are complex pipelines, too many valves and pump sets. Moreover, the hot water storage tank 5 often suffers from insufficient heat supply during peak water consumption periods and daytime periods. The time-sharing heat storage cogeneration system of the present invention can better solve the above problems. By adding a primary side auxiliary heat storage loop outside the primary side heat storage loop, the solar energy is combined with the energy of the traditional electric boiler to utilize Renewable solar energy collects and stores heat in time-sharing, which solves the problem of insufficient heat supply during the daytime and peak water consumption periods of the hot water storage tank.

In an optional solution of this embodiment, as shown in FIG. 4 , further, the time-sharing heat storage cogeneration system further includes a replenishment tank 14 and a replenishment pump 15 . Wherein, the replenishment tank 14 communicates with the closed circuit where the solar heat collector 10 is located through a replenishment pump 15 . In this embodiment, due to possible leakage and evaporation of the flowing heat medium, the loss is reduced. The role of the liquid replenishment tank 14 and the liquid replenishment pump 15 is to replenish sufficient heat medium in time to ensure the normal operation of heat collection and heat exchange in the circuit. run. In particular, the inner tank of the liquid replenishment tank 14 is made of 304 stainless steel, and the outer shell is made of 201 stainless steel. Simultaneously can supplement the antifreeze that standard is the propylene glycol solution of-25 degree Celsius to make in the replenishment tank 14.

In an optional solution of this embodiment, as shown in FIG. 4 , further, the time-sharing heat storage cogeneration system further includes an expansion tank 16 . Specifically, the expansion tank 16 communicates with the closed circuit where the solar collector 10 is located. In this embodiment, the function of the expansion tank 16 is to absorb the volume of the expansion tank 16 when the temperature of the working medium increases and the volume expands, so as to prevent the pressure in the circuit from rising too fast, and release the liquid in the tank when the temperature of the working medium decreases and the volume shrinks. Supplement to the circuit to avoid the pressure of the circuit from dropping too fast, so as to reduce the pressure relief times of the safety valve and the working times of the replenishment pump 15.

In an optional solution of this embodiment, as shown in FIG. 4 , further, the time-sharing heat storage cogeneration system further includes a first heat meter 17 , a second heat meter 18 and a control component. Specifically, the first heat meter 17 is located in the closed circuit of the solar collector 10, the second heat meter 18 is located in the closed circuit of the heat exchange circulation pump 13, and the control components are respectively connected to the first heat meter 17, the second heat meter 18 and Heat exchange circulation pump 13. According to the heat exchange temperature difference measured by the first heat meter 17 and the second heat meter 18, utilize the control assembly provided in the closed circuit where the solar heat collector 10 is located to control and adjust the starting frequency and time of the heat exchange circulation pump 13 to reach the appropriate time , The required period of time to realize the supplementary heat storage of the solar heat collection circuit.

In the optional scheme of this embodiment, as shown in Figure 4, preferably, the solar heat collector 10 can be selected from flat plate, all-glass vacuum tube or U-shaped tube heat collectors to meet different heating needs , installation conditions and external weather conditions.

Fig. 5 is a schematic cross-sectional view of the pipeline in the closed loop of the heat storage system provided by the present invention. In an optional solution of this embodiment, as shown in FIG. 5 , further, the pipeline of the closed circuit where the solar collector 10 is located includes a steel pipe 19 , an insulation pipe 20 and an insulation layer 21 sequentially from the inside to the outside. In this embodiment, the steel pipe 19 can provide sufficient structural strength for the pipeline, reducing the stress caused by system vibration and bending; and the heat preservation pipe 20 can reduce the heat loss when the heat medium flows in the pipeline; To fix the heat preservation pipe 20, on the other hand prevent the heat preservation pipe 20 from being damaged.

In an optional solution of this embodiment, as shown in FIG. 5 , preferably, the insulation pipe 20 is made of flame-retardant rubber and plastic. In this embodiment, the flame-retardant rubber and plastic have good thermal insulation performance and are not easy to burn under the high temperature of the heat medium. Moreover, the flame-retardant rubber and plastics do not contain harmful chlorofluorochemicals, which meet the requirements of international environmental protection certification. During the installation process and use, they will not produce any polluting gases that are harmful to human health. Moreover, due to its soft material and no need for other auxiliary layers, the construction and installation are simple and fast. Preferably, the flame-retardant rubber-plastic insulation pipe 20 can be set to a thickness of 30 mm, and adopt B1 grade material.

In an optional solution of this embodiment, as shown in FIG. 5 , preferably, the material of the insulation layer 21 is metal aluminum. Metal aluminum has high mechanical strength, but at the same time has low density, high finish and is not easy to corrode. The thickness of the aluminum insulation layer 21 can be set to 0.2 mm.

The above-mentioned time-sharing heat storage and cogeneration system uses electric boilers and solar energy to store heat and collect heat at the same time, and its economic benefits are remarkable. The brief description is as follows:

1. The daily heat output of solar energy

According to the solar radiation resources in the Beijing area, considering the influence of solar energy efficiency, guarantee rate, heat loss and other factors, the daily heat output of solar energy in this project is calculated according to the following formula:

ΔQ _SAVE ＝A _C J _T η _cd (1-η _L )

In the formula:

ΔQ _SAVE ——daily average energy saving;

A _C ——the area of the solar collector, in ㎡; the total solar area of the system is 264㎡;

J _T ——the solar radiation on the daylighting surface of the solar collector, unit KJ/㎡. 17.28MJ/(㎡·d) in Beijing area;

365 - the number of days in a year;

η _cd ——solar collector efficiency, dimensionless. Take 0.6;

η _L ——heat loss of pipeline and water storage tank, dimensionless. Take 0.2;

Bringing in the above data to calculate: ΔQ _SAVE =2189.7MJ. That is: the daily heat output of solar energy is 2189.7MJ. The heat output in 365 days of the year is: 2189.7MJ×365＝799248.4MJ

2. The solar system saves electricity every year

W＝ΔQ _SAVE /(3.6×η)×365

In the formula:

W——the annual power saving within the system life, Kwh;

η——thermal efficiency of auxiliary heat source, 0.9;

Calculated by substituting the data, the annual electricity saving of the solar system is 246681.6Kwh.

3. The solar energy system saves the total cost every year

(1) Yearly electricity savings

F=W×C _C

In the formula:

F——the electricity cost saved in the year, yuan;

W——annual power saving, 246681.6KWH;

C _C ——Conventional energy price, 1.26 yuan/KWH;

Calculated by bringing in the data, the annual saving of electricity costs is 310818.76 yuan.

(2) Annual maintenance cost of solar system

1% of the total investment in the solar energy system, the total cost of this project is 1,198,500 yuan, namely: 1,198,500×1%=11,985 yuan.

(3) The total annual cost savings of solar energy systems

The annual saved electricity fee - the annual maintenance fee of the solar energy system, namely: 310818.76-11985 = 298833.76 yuan.

4. Calculation of investment payback period of solar energy system

The total annual saving of solar energy is 298,833.76 yuan, and the investment of solar energy system is 1,198,500 yuan, so the payback period of installing solar energy is:

5. Environmental benefits

The environmental protection benefit of solar energy system is mainly reflected by the environmental protection benefit of system energy saving: the emission of pollutants is reduced due to the saving of conventional energy, and the main indicator is the reduction of carbon dioxide emission. Convert the energy saving during the system life into standard coal, and then convert the carbon content in standard coal into carbon dioxide, which is the carbon dioxide emission reduction of the solar system. The calculation formula is:

Q _CO2 ＝(-ΔQ _SAVE )/q×365×n×2.47

In the formula:

Q _CO2 - carbon dioxide emissions during the life of the system, tons;

q - calorific value of standard coal, 29308KJ/kg;

2.47 - 2.47kg CO2 produced per kg of standard coal combustion;

n——system life span, calculated on the basis of 15 years;

Substituting the data into: Q _CO2 = 1010 tons, the annual carbon dioxide emission reduction is: 67.4 tons. The annual saving of standard coal is: 67.4/2.47=27.3 tons.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (10)

1. A heat storage system, characterized in that it comprises a primary heat storage loop; the primary heat storage loop is sequentially provided with a main heat source assembly, a heat storage circulation pump, a three-way control valve, and a first heat exchanger , the hot water storage tank, the first valve, the second valve, the third valve and the fourth valve; The main heat source assembly, the heat storage circulation pump, the three-way control valve, the first heat exchanger and the first valve are connected through pipelines to form a closed loop; The main heat source assembly, the thermal storage circulation pump, the three-way control valve, the first heat exchanger, the second valve, the hot water storage tank and the fourth valve are connected through pipelines to form a closed loop; The main heat source assembly, the thermal storage circulation pump, the three-way control valve, the third valve, the hot water storage tank and the fourth valve are connected through pipelines to form a closed loop. 2. The heat storage system according to claim 1, wherein the main heat source component is an electric boiler or a heat pump. 3. A time-sharing heat storage cogeneration system, characterized in that it comprises an auxiliary heat storage loop on the primary side and the heat storage system according to any one of claims 1-2; The primary-side auxiliary heat storage loop includes a solar heat collector, a heat collection circulation pump, a second heat exchanger, and a heat exchange circulation pump; The solar heat collector, the heat collecting circulation pump and the second heat exchanger are connected through pipelines to form a closed loop; the heat storage tank, the heat exchange circulation pump and the second heat exchanger are connected through The pipes are connected to form a closed loop. 4 . The time-sharing thermal storage cogeneration system according to claim 3 , further comprising a liquid replenishment tank and a liquid replenishment pump, and the liquid replenishment tank communicates with the closed circuit where the solar heat collector is located through the liquid replenishment pump. 5 . The time-sharing heat storage cogeneration system according to claim 3 , further comprising an expansion tank, the expansion tank being in communication with the closed circuit where the solar heat collector is located. 6 . 6. The time-sharing heat storage cogeneration system according to claim 3, further comprising a first heat meter, a second heat meter and a control assembly; The first heat meter is located in the closed loop of the solar collector; the second heat meter is located in the closed loop of the heat exchange circulating pump; The control assembly is respectively connected to the first heat meter, the second heat meter and the heat exchange circulation pump. 7. The time-sharing heat storage cogeneration system according to any one of claims 3-6, characterized in that the solar heat collector is a flat plate, all-glass vacuum tube or U-shaped tube heat collector. 8. The time-sharing heat storage cogeneration system according to any one of claims 3 to 6, characterized in that, the pipeline of the closed circuit where the solar collector is located includes a steel pipe, an insulation pipe and an insulation layer in sequence from the inside to the outside . 9. The time-sharing heat storage and co-generation system according to claim 8, characterized in that, the heat preservation pipe is made of flame-retardant rubber and plastic. 10. The time-sharing thermal storage cogeneration system according to claim 8, characterized in that, the material of the thermal insulation layer is metal aluminum.