CN115342410A - A zero-carbon heating system coupled with biomass boiler and solar concentrated photovoltaic photothermal - Google Patents

Abstract

The invention discloses a zero-carbon heating system coupled with a biomass boiler and solar concentrating photovoltaic light and heat, which includes a biomass generator set, a light-heating water circulation loop and a water source heat pump system. The biomass generator set includes a wind-smoke system, Steam cycle system and organic Rankine cycle system, the high-temperature flue gas output by the air-smoke system passes through the steam cycle system, organic Rankine cycle system and tail flue heat exchanger in turn; the light and hot water cycle circuit can store hot water The water in the tank performs heat exchange, and the water after heat exchange in the heat storage tank is sent to the tail flue heat exchanger through the hot water supply circulation loop; the water source heat pump system receives the water output from the heating terminal through the hot water supply circulation loop, And sent to the hot water storage tank for heat exchange, and then sent to the tail flue heat exchanger through the hot water circulation loop. The invention utilizes flue gas at different temperatures to generate power; heats working medium water at different temperatures, thereby realizing cascade utilization of energy.

Description

A zero-carbon heating system coupled with biomass boiler and solar concentrating photovoltaic photothermal

technical field

The invention relates to the technical field of heating systems, in particular to a zero-carbon heating system coupled with a biomass boiler and solar concentrated photovoltaic light and heat.

Background technique

The transition to green and low-carbon energy has become an inevitable trend. Thermal systems using natural gas and renewable energy as the main energy sources are gradually replacing coal. It is predicted that the consumption of natural gas used for heating in northern my country will exceed 180 billion cubic meters. However, my country's natural gas resource reserves are low and the supply is limited, so it is necessary to import a large amount of foreign natural gas resources. At present, the international natural gas market is relatively unstable, and dependence on natural gas will inevitably lead to energy security risks. Therefore, another clean energy to replace natural gas is urgently needed.

The current industrial heat supply basically comes from fossil energy, through burning coal, oil or natural gas to generate the required heating steam or hot water. Due to low design parameters, low energy efficiency, and insufficient environmental protection settings, this type of heating boiler has a negative impact on the surrounding environment, and its price is relatively high, which increases the economic burden on industrial heat users. And under the policy background of strict control of coal consumption, facing the dual pressure of total energy consumption limit and greenhouse gas emissions, virtually increased heating costs

Biomass exists widely in nature and exists in the form of crops, forests, animal metabolites and agricultural and forestry wastes. It has the characteristics of environmental protection, energy saving, renewability and rich yield. my country's agricultural biomass resources are relatively rich, mainly concentrated in the northern region of my country. Therefore, the utilization of biomass resources in the northern region has great application potential, which can effectively alleviate the pressure of natural gas consumption. At present, the biomass briquette fuel boiler technology is relatively mature. Under the influence of technological development and national policies, biomass boilers have developed rapidly in the northern region and are widely used in the field of cogeneration.

The main principle of photovoltaic photothermal technology (PV/T) is to install a cooling flow channel at the bottom of the photovoltaic cell, and absorb and utilize the heat of the photovoltaic cell while cooling the photovoltaic cell through cooling water. As a solar heat and power cogeneration technology, compared with conventional photovoltaic cells or heat collectors, it has a higher comprehensive utilization rate of solar energy. Concentrating technology can effectively improve the quality of PV/T heat production by increasing the energy density of incident solar energy, and can increase the outlet water temperature to above 50°C. Due to the use of cheap concentrators, the system cost can be greatly reduced, and comprehensive utilization of solar energy with high efficiency and low cost can be realized.

Ground source heat pumps make full use of geothermal energy, absorb or release heat from land and groundwater through buried pipes, and use it for heating in winter or cooling in summer. At the same time, they can also use the heat storage capacity of land and groundwater to achieve inter-seasonal energy storage. It is a clean and efficient energy supply equipment. The low-grade heat source produced by solar energy can supplement the heat produced by the ground source heat pump, which can improve the energy efficiency of photovoltaic thermal technology and ground source heat pump at the same time.

Therefore, those skilled in the art provide a zero-carbon heating system that applies concentrating photovoltaic photothermal technology, biomass power generation unit and ground source heat pump technology to the technical field of thermal system technology. system to solve the problems raised in the background art above.

Contents of the invention

The invention provides a method of utilizing flue gas at different temperatures to generate electricity by using steam cycle and organic Rankine cycle; using waste heat of photovoltaic photothermal technology, water source heat pump and waste heat of flue gas at the tail of a biomass boiler to heat working medium water at different temperatures , to realize the cascade utilization of energy; at the same time, it improves the efficiency of concentrating photovoltaic photothermal technology, reduces the carbon dioxide emission rate, and realizes the dual benefits of energy saving and environmental protection. thermal system.

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

A biomass boiler and a zero-carbon heating system coupled with solar energy concentrating photovoltaic light and heat of the present invention, the system includes:

Biomass power generation unit, the biomass power generation unit includes air-smoke system, steam cycle system and organic Rankine cycle system, the high-temperature flue gas output by the air-smoke system passes through the steam cycle system, organic Rankine cycle system and tail smoke in sequence. channel heat exchanger;

Light and hot water circulation loop, the light and hot water circulation loop can exchange heat for the water in the heat storage tank, and the water after heat exchange in the heat storage tank is sent to the tail flue heat exchanger through the hot water supply circulation loop;

Water source heat pump system, the water source heat pump system receives the water output from the heating terminal through the hot water supply circulation loop, and sends it to the hot water storage tank for heat exchange, and then sends it to the tail flue heat exchanger through the hot water supply circulation loop;

The tail flue heat exchanger supplies heat to the heat supply terminal after exchanging heat.

Further, the wind-smoke system includes a biomass boiler and a chimney, and the flue gas output by the biomass boiler passes through the steam cycle system, the organic Rankine cycle system and the tail flue heat exchanger in sequence, and is discharged through the chimney.

Further, the steam cycle includes a steam cycle evaporator, a steam turbine, a steam cycle condenser and a feed water pump; the working medium inlet of the steam cycle evaporator communicates with the pipeline surrounding the wall of the biomass boiler, and the steam cycle evaporates A working medium outlet of the condenser is sequentially connected to the steam turbine and the steam cycle condenser through a pipeline, and the water outlet end of the steam cycle condenser is sequentially connected to the feed water pump and the working medium inlet of the steam cycle evaporator through a pipeline.

Further, the organic rankine cycle includes an organic rankine cycle evaporator, an organic rankine cycle steam turbine, a regenerative heat exchanger, an organic rankine cycle condenser and an organic rankine cycle pump, and the organic rankine cycle evaporator One of the flue gas inlets communicates with the flue gas outlet of the steam cycle evaporator through a pipeline, and the working medium outlet of the organic Rankine cycle evaporator communicates with the intake end of the organic Rankine cycle steam turbine through a pipeline, and the organic Rankine cycle The steam exhaust port of the steam turbine communicates with the thermal working medium inlet of the regenerative heat exchanger, and the thermal working medium outlet of the recuperative heat exchanger communicates with the inlet end of the organic Rankine cycle condenser through a pipeline, and the organic Rankine cycle The liquid outlet of the condenser is connected to the organic Rankine circulation pump and the refrigerant inlet of the regenerative heat exchanger in sequence through pipelines, and the refrigerant outlet of the recuperation heat exchanger is connected to the organic Rankine circulation evaporator through pipelines. The working medium inlet is connected, the flue gas outlet of the organic Rankine cycle evaporator is connected with the flue gas inlet of the tail flue heat exchanger through a pipeline, and the flue gas outlet of the tail flue heat exchanger is connected with the flue gas inlet of the tail flue heat exchanger through a pipeline. The chimney connects.

Further, the solar hot water circulation loop system includes concentrated photovoltaic solar thermal components, buried pipes and solar hot water circulation pumps, and the water outlet end of the concentrated photovoltaic solar thermal components passes through the first water delivery pipeline and the water storage tank. One water inlet port is connected, and one water outlet end of the hot water storage tank is connected to the water inlet end of the photothermal water circulation pump and the buried pipe in turn through the pipeline, and the water outlet end of the buried pipe is connected to the collector through the second water delivery pipeline. The water inlet end of the photovoltaic photothermal module is connected, the other water outlet end of the hot water storage tank is connected with the water inlet end of the tail flue heat exchanger through the fourth water delivery pipeline, and the other water inlet end of the hot water storage tank is The end is communicated with the water outlet end of the heating terminal through the fifth water delivery pipeline.

Further, the concentrated photovoltaic photothermal module is connected in parallel with the third water delivery pipeline, and the third water delivery pipeline is connected with the first water delivery pipeline and the second water delivery pipeline respectively, and the third water delivery pipeline is connected with the first water delivery pipeline. A light and hot water circulation control valve is arranged at the junction of the first water delivery pipeline and the second water delivery pipeline.

Further, the hot water supply circulation circuit includes:

The heat storage circulation pump installed on the fourth water delivery pipeline;

A hot water circulation pump is installed on the sixth water delivery pipeline, and the sixth water delivery pipeline communicates with the fifth water delivery pipeline and the water inlet end of the water source heat pump system.

Further, the water source heat pump system includes a heat pump condenser, a throttling valve, a heat pump evaporator and a compressor connected in a ring through pipelines, the water inlet end of the heat pump condenser communicates with the sixth water delivery pipeline, and the heat pump The water outlet end of the condenser communicates with the fourth water delivery pipeline through the seventh water delivery pipeline, the heat pump evaporator communicates with the fifth water delivery pipeline through the eighth water delivery pipeline, and the heat pump evaporator communicates with the fifth water delivery pipeline through the ninth water delivery pipeline. The fourth water delivery pipeline is connected, the connection between the seventh water delivery pipeline and the fourth water delivery pipeline is installed with a first hot water supply cycle control valve, and the connection between the ninth water delivery pipeline and the fourth water delivery pipeline is installed with a second The control valve of the hot water tank, the second hot water supply circulation control valve is installed at the junction of the sixth water delivery pipeline and the fifth water delivery pipeline, and the first The control valve of the hot water storage tank, the first hot water supply circulation control valve is set close to the tail flue heat exchanger, the second hot water storage tank control valve is set close to the hot water storage circulation pump, and the second hot water supply circulation The control valve is set close to the heat supply terminal, and the control valve of the first heat storage tank is set close to the heat storage tank.

In the above technical solution, the present invention provides a biomass boiler and a zero-carbon heating system coupled with solar concentrated photovoltaic light and heat, which has the following beneficial effects:

1. The efficient utilization of solar energy is realized. By switching control of the concentrated photovoltaic photothermal module-buried pipe circulation and the single buried pipe circulation, the components are maintained at a suitable working temperature, and the power generation is further improved.

2. The conversion efficiency of solar energy reaches about 70%. The concentrated photovoltaic photothermal system can effectively save the installation area compared with the traditional independent installation of solar panels and solar collectors.

3. The application of the water source heat pump system effectively utilizes the low-temperature heat source, improves the COP value of the heat pump, and can realize efficient heating.

4. The unstable waste heat generated by photovoltaic photothermal technology is absorbed through buried pipe heat storage, water source heat pump and biomass boiler tail flue gas heat replenishment, realizing stable residential heat supply.

5. The cascade utilization of energy has been realized, the heat of flue gas at different temperatures is used for power generation through steam cycle and organic Rankine cycle, and the photovoltaic photothermal technology is realized by using different heating equipment for different outlet temperatures of hot water storage tanks. And cascade utilization of waste heat in tail flue gas.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings that are required in the embodiments. Obviously, the accompanying drawings in the following description are only described in the present invention For some embodiments of the present invention, those skilled in the art can also obtain other drawings according to these drawings.

Figure 1 is a schematic diagram of a zero-carbon heating system coupled with a biomass boiler and solar concentrating photovoltaic photothermal heat provided by an embodiment of the present invention;

Fig. ₂ is a diagram of the hot water supply cycle when the outlet water temperature of the hot water storage tank in Fig. ₁ is higher than T1 or lower than T2;

Fig. ₃ is a diagram of the hot water supply cycle when the outlet water temperature of the hot water storage tank in Fig. ₁ is between T1 and T2.

Explanation of reference signs:

1. Concentrating photovoltaic photothermal components; 2. Hot water storage tank; 3. Buried pipe; 4. Tail flue heat exchanger; 5. Heat pump condenser; 6. Throttle valve; 7. Heat pump evaporator; 8 , Compressor; 9. Light and hot water circulation control valve; 10. First water storage tank control valve; 11. First hot water supply circulation control valve; 12. Light and hot water circulation pump; 13. Hot water circulation pump; 14. 15. Heat supply terminal; 16. Steam cycle evaporator; 17. Steam turbine; 18. Steam cycle condenser; 19. Feed water pump; 20. Organic Rankine cycle evaporator; 21. Organic Rankine cycle steam turbine ; 22. Regenerative heat exchanger; 23. Organic Rankine cycle condenser; 24. Organic Rankine cycle pump; 25. Chimney; 26. Biomass boiler; 27. First water pipeline; 28. Second water pipeline 29, the fourth water pipeline; 30, the fifth water pipeline; 31, the third water pipeline; 32, the sixth water pipeline; 33, the seventh water pipeline; 34, the eighth water pipeline; 35. The ninth water delivery pipeline; 36. The second hot water storage tank control valve; 37. The second hot water supply circulation control valve.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

See Figure 1;

A biomass boiler and a zero-carbon heating system coupled with solar energy concentrating photovoltaic light and heat described in the embodiment of the present invention, the system includes:

Biomass power generation unit, the biomass power generation unit includes air-smoke system, steam cycle system and organic Rankine cycle system, the high-temperature flue gas output by the air-smoke system passes through the steam cycle system, organic Rankine cycle system and tail smoke in sequence. channel heat exchanger;

Light and hot water circulation loop, the light and hot water circulation loop can exchange heat for the water in the heat storage tank 2, and the water after heat exchange in the heat storage tank 2 is sent to the tail flue heat exchanger 4 through the hot water supply circulation loop ;

Water source heat pump system, the water source heat pump system receives the water output from the heating terminal 15 through the hot water supply circulation loop, and sends it to the hot water storage tank 2 for heat exchange, and then sends it to the tail flue heat exchanger through the hot water supply circulation loop 4;

The tail flue heat exchanger supplies heat to the heat supply terminal 15 after exchanging heat.

The wind-smoke system includes a biomass boiler 26 and a chimney 25 , the flue gas output from the biomass boiler 26 passes through the steam circulation system, the organic Rankine cycle system and the tail flue heat exchanger 4 in turn, and is discharged through the chimney 25 .

The high-temperature flue gas obtained from the combustion in the biomass boiler 26 transfers heat to the steam cycle working medium, the organic Rankine cycle working medium, and light and hot water in the steam cycle system, the organic Rankine cycle system, and the tail flue heat exchanger 4 respectively. loop loop.

The steam cycle includes a steam cycle evaporator 16, a steam turbine 17, a steam cycle condenser 18, and a feed water pump 19; the working medium inlet of the steam cycle evaporator 16 communicates with the pipeline surrounding the wall of the biomass boiler 26, through the pipe The pipeline exchanges heat with the flue gas inside the biomass boiler 26. A working fluid outlet of the steam cycle evaporator 16 is connected to the steam turbine 17 and the steam cycle condenser 18 in turn through a pipeline, and the water outlet of the steam cycle condenser 18 The feed water pump 19 and the working medium inlet of the steam cycle evaporator 16 are connected in sequence through pipelines.

The high-temperature and high-pressure steam in the steam cycle evaporator 16 adiabatically expands in the steam turbine 17 and drives the steam turbine 17 to rotate to generate electricity. The expanded steam is condensed into water in the steam cycle condenser 18 and re-enters after being pressurized by the feed water pump 19. The heat is exchanged in the steam cycle evaporator 16 .

Described organic rankine cycle comprises organic rankine cycle evaporator 20, organic rankine cycle steam turbine 21, regenerative heat exchanger 22, organic rankine cycle condenser 23 and organic rankine cycle pump 24, described organic rankine cycle A flue gas inlet of the evaporator 20 communicates with the flue gas outlet of the steam cycle evaporator 16 through a pipeline, and the working medium outlet of the organic Rankine cycle evaporator 20 communicates with the inlet port of the organic Rankine cycle steam turbine 21 through a pipeline. Connected, the exhaust port of the organic Rankine cycle steam turbine 21 is connected with the thermal working medium inlet of the recuperator heat exchanger 22, and the thermal working medium outlet of the recuperative heat exchanger 22 is connected with the organic Rankine cycle condenser 23 through a pipeline. The inlet port of the organic rankine cycle condenser 23 is connected to the liquid outlet end of the organic rankine cycle condenser 23 through a pipeline, which is connected to the organic rankine cycle pump 24 and the cold working medium inlet of the recuperation heat exchanger 22, and the refrigerant inlet of the recuperation heat exchanger 22 is connected The outlet of the cold working fluid communicates with the inlet of the working fluid of the organic Rankine cycle evaporator 20 through a pipeline, and the flue gas outlet of the organic Rankine cycle evaporator 20 communicates with the flue gas inlet of the tail flue heat exchanger 4 through a pipeline , the flue gas outlet of the tail flue heat exchanger 4 communicates with the chimney 25 through a pipeline.

The high-temperature and high-pressure benzene vapor in the organic rankine cycle evaporator 20 is adiabatically expanded in the organic rankine cycle steam turbine 21 and drives the organic rankine cycle steam turbine 21 to rotate to generate electricity. The heat is transferred to the low-temperature and high-pressure working medium benzene, and the cooled benzene vapor is condensed into a liquid state in the organic Rankine cycle condenser 23, and after being pressurized by the organic Rankine cycle pump 24, it re-enters the heat recovery heat exchanger 22 to convert heat. The water part in the regenerative heat exchanger 22 is used again through heat exchange in the organic Rankine cycle evaporator 20 .

The solar hot water circulation loop system includes a concentrated photovoltaic solar thermal module 1, an underground pipe 3 and a solar hot water circulation pump 12. One water inlet end of the tank 2 is connected, and one water outlet end of the hot water storage tank 2 is connected to the water inlet end of the light and hot water circulation pump 12 and the buried pipe 3 in turn through a pipeline, and the water outlet end of the buried pipe 3 passes through The second water delivery pipeline 28 communicates with the water inlet end of the concentrated photovoltaic photothermal module 1, and the other water outlet end of the heat storage tank 2 passes through the fourth water delivery pipeline 29 and the water inlet of the tail flue heat exchanger 4 The other water inlet end of the hot water storage tank 2 communicates with the water outlet end of the heating terminal through the fifth water delivery pipeline 30 .

The concentrated photovoltaic photothermal module 1 is connected in parallel with the third water delivery pipeline 31, and the third water delivery pipeline 31 communicates with the first water delivery pipeline 27 and the second water delivery pipeline 28 respectively, and the third water delivery pipeline 31 A light and hot water circulation control valve 9 is provided at the connection with the first water delivery pipeline 27 and the second water delivery pipeline 28 .

The concentrated photovoltaic photothermal module 1 is the core component of the light and hot water circulation loop, and its inlet and outlet are respectively connected to the outlet of the buried pipe 3 and the heat storage tank 2 through the light and heat water circulation control valve 9. The water is pressurized by the photothermal water circulation pump 12 and enters the buried pipe 3 to absorb/store heat, and then enters the concentrated photovoltaic photothermal module 1 through the photothermal water circulation control valve 9 or directly returns to the heat storage tank 2.

The hot water circulation circuit includes:

The heat storage circulation pump 13 arranged on the fourth water delivery pipeline 29, the heat storage circulation pump 13 is used to provide power to the heat storage tank 2 for returning water;

The hot water circulation pump 14 is installed on the sixth water delivery pipeline 32 , the sixth water delivery pipeline 32 and the fifth water delivery pipeline 30 communicate with the water inlet end of the water source heat pump system. The hot water supply circulation pump 14 is used to provide power for the circulating water of the hot water supply circulation loop

The water source heat pump system includes a heat pump condenser 5, a throttling valve 6, a heat pump evaporator 7, and a compressor 8 connected in a ring through pipelines. The water inlet end of the heat pump condenser 5 is connected to the sixth water delivery pipeline 32 The water outlet of the heat pump condenser 5 communicates with the fourth water pipeline 29 through the seventh water pipeline 33, and the heat pump evaporator 7 communicates with the fifth water pipeline 30 through the eighth water pipeline 34. The heat pump The evaporator 7 communicates with the fourth water delivery pipeline 29 through the ninth water delivery pipeline 35, and the first hot water supply circulation control valve 11 is installed at the connection between the seventh water delivery pipeline 33 and the fourth water delivery pipeline 29, and the ninth water supply pipeline A second hot water storage tank control valve 36 is installed at the connection between the water delivery pipeline 35 and the fourth water delivery pipeline 29, and a second hot water supply circulation control valve is installed at the connection between the sixth water delivery pipeline 32 and the fifth water delivery pipeline 30 37. The first water storage tank control valve 10 is installed at the connection between the eighth water delivery pipeline 34 and the fifth water delivery pipeline 30 respectively, and the first hot water supply cycle control valve 11 is set close to the tail flue heat exchanger 4 , the second hot water storage tank control valve 36 is set close to the hot water storage circulation pump 13, the second hot water supply circulation control valve 37 is set close to the heat supply terminal 15, and the first hot water storage tank control valve 10 is close to The hot water storage tank 2 is set.

The working medium in the water source heat pump system absorbs heat in the heat pump evaporator 7, is compressed and heated in the compressor 8, and enters the condenser 5 to transfer heat to the heating medium, and then enters the throttle valve 6 for adiabatic expansion .

The hot water supply circulation circuit receives the water output from the hot water storage tank 2 through the fourth water delivery pipeline 29, and after being pressurized by the hot water storage circulation pump 13, it reaches the control valve 10 of the first hot water storage tank and enters the heat pump evaporator 7 Provide a low-level heat source for the water source heat pump or enter the tail flue heat exchanger 4 through the first hot water supply cycle control valve 11 to supplement heat and directly provide heat for the heat supply terminal 15, and the working medium water after heat exchange is returned to the heat storage tank 2.

The light and hot water circulation control valve 9 is used to switch and control the circulation of the concentrated photovoltaic photothermal module 1-buried pipe 3 and the circulation of the single buried pipe 3, and the described light and hot water circulation pump 12 is used to control the Photovoltaic solar thermal module - water circulation on the side of the buried pipe provides power; the temperature difference between the outlet temperature of the concentrated photovoltaic solar thermal module 1 and the outlet temperature of the buried pipe 3 is used as the control parameter, when the outlet temperature of the concentrated photovoltaic solar thermal module 1 and the buried pipe 3 When the outlet temperature difference is lower than 2°C, because the solar radiation intensity is not high or the concentrated photovoltaic solar thermal module loses too much heat to the external environment, the cycle of the concentrated photovoltaic solar thermal module is closed. When the temperature difference is greater than 5°C, it is considered that the concentrated photovoltaic photothermal module 1 receives high energy, and it is necessary to recycle the waste heat of the module and reduce the temperature of the module to improve the efficiency of the solar cell, so the photothermal water circulation loop system is turned on. When the temperature difference is 2-5°C, maintain the original cycle process.

The hot water supply circulation loop uses the temperature at the outlet of the hot water storage tank 2 as the control parameter, and there are three heating operation modes according to different values, T ₁ and T ₂ are the preset temperatures at the outlet of the hot water storage tank 2; when the hot water storage tank When the water temperature at the outlet of tank 2 is higher than the design temperature T ₁ , the outlet water of the hot water storage tank 2 is used to directly supply heat to the hot water circulation circuit; when the water temperature at the outlet of the hot storage tank 2 is lower than another design temperature T ₂ , only the tail is opened The flue heat exchanger 4 heats the circulating water in the hot water circulation loop; when the outlet temperature of the hot water storage tank ₂ is between T2 and T1, the outlet water of the hot water storage tank ₂ cannot meet the load demand of the hot water supply circulation loop , and it can be used as the low-temperature heat source of the water source heat pump 5 to improve the efficiency of the water source heat pump 5, heat the circulating water of the hot water circulation loop with the heat pump, and the heated circulating water of the hot water supply circulation loop still enters the tail flue heat exchanger 4 Carry out heat supplementation.

The concentrated photovoltaic photothermal module 1 includes solar cells, upper and lower glass cover plates, and heat collectors, and a cooling flow channel is installed at the bottom of the photovoltaic cells to cool the photovoltaic cells through a cooling medium while absorbing and utilizing the heat of the photovoltaic cells and entering the storage. In the hot water tank 2, the material of the heat collector is tempered glass, and the internal cooling medium is water.

The heat collected by the concentrated photovoltaic photothermal module 1 is first stored in the hot water storage tank 2 to meet the real-time heating demand of the system, and the excess heat is stored in the buried pipe 3 system to carry out short, medium and long-term solar radiation and load demand. Mismatch between adjustments.

As shown in Figure ₃ , when the outlet temperature of the heat storage tank is between T2 and T1, the working medium water starts from the heat storage tank ₂ and enters the heat pump evaporator 7 for heat exchange, and the water after heat exchange is returned to the storage tank. The hot water tank 2, the working fluid in the water source heat pump absorbs the heat in the heat pump evaporator 7 and then enters the compressor 8 for compression. Enter the throttle valve 6 for decompression, and then re-enter the heat pump evaporator 7 for heat exchange. The heated circulating water of the hot water supply circulation loop passes through the tail flue heat exchanger 4 to replenish heat, and then enters the hot water supply circulation loop to supply heat to the heat supply terminal 15 . The return water re-enters the condenser 5 for heat exchange after being pressurized by the hot water circulation pump 14 .

Example: Take a typical dormitory building heating system and biomass generator set. The dormitory has three floors, with a total area of 2142m ² and a total living area of about 1458m ² . Each floor of the dormitory contains 27 dormitories, the total number of dormitories is 342, and each dormitory contains 4 personnel. Each floor of the dormitory is equipped with two toilets and two washrooms. The fuel of the biomass generator set is typical northern wheat straw, the feed rate is 0.5t/h, the main steam pressure is 4.98MPa, the temperature is 430°C, and the exhaust steam pressure is 2.0MPa. When using the biomass power generation unit of this application and the zero-carbon emission heat and power cogeneration system coupled with solar concentrated photovoltaic photothermal heat, the concentrated photovoltaic photothermal module 1 has an area of 100m ² , its maximum output electric power exceeds 40kW, and its maximum output thermal power exceeds 250kW; the output electric power of the biomass generating set is 0.6MW, and the output thermal power is 0.1MW. The volume of the hot water storage tank 2 is set according to the capacity of 0.04-0.1m3 per square meter of solar collector lighting area. The number of 3 holes in the buried pipe is 8-10. The direct heating temperature T1 of the water at the outlet of the heat storage tank ₂ is 65-70°C, and the temperature T2 of the outlet water of the heat storage tank ₂ that only relies on the tail flue heat exchanger 4 for heat supplementation is 13-17°C. At this time, the COP value of the water source heat pump system is mostly between 3-4. It shows that the low-grade heat source increases the COP value of the water source heat pump system during operation, which can make the COP of the water source human pump system higher than its rated value, and makes full use of the low-grade heat source to achieve efficient heating to the heating network. The electrical efficiency of the system is mainly concentrated between 23% and 30%, the thermal efficiency is mainly around 15%, and the total efficiency is basically above 40%.

The solar energy utilization efficiency of the application system is high, which can effectively convert solar energy for combined heat and power supply, realize reliable replacement of traditional independent solar panels and solar collectors, and increase the proportion of clean energy utilization by saving the external surface area of buildings required by the system . The unstable waste heat generated by PV/T is absorbed by means of buried pipe 3 heat storage, water source heat pump system and tail flue heat exchanger 4 heat supplement, realizing stable residential heat supply. Moreover, the cascade utilization of energy is realized by adopting different heat supplementary equipment for different outlet temperatures of the hot water storage tank 2 .

Certain exemplary embodiments of the present invention have been described above only by way of illustration, and it goes without saying that those skilled in the art can use various methods without departing from the spirit and scope of the present invention. The described embodiments are modified. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present invention.

Claims (8)

1. The utility model provides a zero carbon heating system of biomass boiler and solar energy spotlight photovoltaic light and heat coupling which characterized in that, this system includes:

the biomass power generation unit comprises a flue gas system, a steam circulation system and an organic Rankine cycle system, and high-temperature flue gas output by the flue gas system sequentially passes through the steam circulation system, the organic Rankine cycle system and a tail flue heat exchanger;

the photo-thermal water circulation loop can exchange heat for water in the heat storage water tank (2), and the water after heat exchange in the heat storage water tank (2) is sent to the tail flue heat exchanger (4) through the hot water supply circulation loop;

the water source heat pump system receives water output by the heat supply terminal (15) through a hot water supply circulation loop, and after the water is conveyed to the heat storage water tank (2) for heat exchange, the water is conveyed to the tail flue heat exchanger (4) through the hot water supply circulation loop;

and the tail flue heat exchanger exchanges heat and supplies heat to a heat supply terminal (15).

2. The biomass boiler and solar concentrating photovoltaic photothermal coupled zero-carbon heating system according to claim 1, wherein the flue gas system comprises a biomass boiler (26) and a chimney (25), and flue gas output by the biomass boiler (26) passes through the steam circulation system, the organic Rankine circulation system and the tail flue heat exchanger (4) in sequence, and is discharged through the chimney (25).

3. The biomass boiler and solar concentrated photovoltaic photothermal coupled zero-carbon heating system according to claim 1, wherein the steam cycle comprises a steam cycle evaporator (16), a steam turbine (17), a steam cycle condenser (18) and a feed water pump (19); the device comprises a steam circulation evaporator (16), a working medium inlet of the steam circulation evaporator (16) is communicated with a pipeline surrounding the wall surface of a biomass boiler (26), a working medium outlet of the steam circulation evaporator (16) is sequentially connected with a steam turbine (17) and a steam circulation condenser (18) through pipelines, and a water outlet end of the steam circulation condenser (18) is sequentially connected with a water feed pump (19) and the working medium inlet of the steam circulation evaporator (16) through pipelines.

4. The biomass boiler and solar concentrated photovoltaic photothermal coupled zero-carbon heating system according to claim 2, characterized in that the organic Rankine cycle comprises an organic Rankine cycle evaporator (20), an organic Rankine cycle turbine (21), a regenerative heat exchanger (22), an organic Rankine cycle condenser (23) and an organic Rankine cycle pump (24), one flue gas inlet of the organic Rankine cycle evaporator (20) is communicated with the flue gas outlet of the steam cycle evaporator (16) through a pipeline, a working medium outlet of the organic Rankine cycle evaporator (20) is communicated with an air inlet end of an organic Rankine cycle turbine (21) through a pipeline, a steam outlet of the organic Rankine cycle turbine (21) is communicated with a hot working medium inlet of a regenerative heat exchanger (22), a hot working medium outlet of the regenerative heat exchanger (22) is communicated with an air inlet end of the organic Rankine cycle condenser (23) through a pipeline, an liquid outlet end of the organic Rankine cycle condenser (23) is sequentially connected with the organic Rankine cycle pump (24) and a cold working medium inlet of the regenerative heat exchanger (22) through pipelines to be communicated, a cold working medium outlet of the regenerative heat exchanger (22) is communicated with a working medium inlet of the organic Rankine cycle evaporator (20) through a pipeline, a flue gas outlet of the organic Rankine cycle evaporator (20) is communicated with a flue gas inlet of the tail flue heat exchanger (4) through a pipeline, and a smoke outlet of the tail flue heat exchanger (4) is communicated with a chimney (25) through a pipeline.

5. The biomass boiler and solar concentrated photovoltaic photo-thermal coupled zero-carbon heat supply system according to claim 1, wherein the photo-thermal water circulation loop system comprises a concentrated photovoltaic photo-thermal component (1), an underground pipe (3) and a photo-thermal water circulation pump (12), the water outlet end of the concentrated photovoltaic photo-thermal component (1) is communicated with the water inlet end of the heat storage water tank (2) through a first water conveying pipeline (27), the water outlet end of the heat storage water tank (2) is sequentially connected with the photo-thermal water circulation pump (12) and the water inlet end of the underground pipe (3) through pipelines, the water outlet end of the underground pipe (3) is communicated with the water inlet end of the concentrated photovoltaic photo-thermal component (1) through a second water conveying pipeline (28), the other water outlet end of the heat storage water tank (2) is communicated with the water inlet end of the tail flue heat exchanger (4) through a fourth water conveying pipeline (29), and the other water inlet end of the heat storage water tank (2) is communicated with the water outlet end of the heat supply terminal through a fifth water conveying pipeline (30).

6. The biomass boiler and solar concentrating photovoltaic photo-thermal coupled zero-carbon heating system according to claim 5, wherein the concentrating photovoltaic photo-thermal assembly (1) is connected with a third water conveying pipeline (31) in parallel, the third water conveying pipeline (31) is respectively communicated with a first water conveying pipeline (27) and a second water conveying pipeline (28), and a photo-thermal water circulation control valve (9) is arranged at the joint of the third water conveying pipeline (31) and the first water conveying pipeline (27) and the second water conveying pipeline (28).

7. The biomass boiler and solar concentrated photovoltaic photothermal coupled zero-carbon heating system according to claim 5, wherein said hot water supply circulation loop comprises:

a heat storage water circulating pump (13) arranged on the fourth water conveying pipeline (29),

the hot water supply circulating pump (14) is arranged on the sixth water conveying pipeline (32), and the fifth water conveying pipeline (30) of the sixth water conveying pipeline (32) is communicated with the water inlet end of the water source heat pump system.

8. The biomass boiler and solar concentrating photovoltaic photo-thermal coupled zero-carbon heat supply system according to claim 7, wherein the water source heat pump system comprises a heat pump condenser (5), a throttle valve (6), a heat pump evaporator (7) and a compressor (8) which are connected into a ring shape through pipelines, the water inlet end of the heat pump condenser (5) is communicated with a sixth water pipeline (32), the water outlet end of the heat pump condenser (5) is communicated with a fourth water pipeline (29) through a seventh water pipeline (33), the heat pump evaporator (7) is communicated with a fifth water pipeline (30) through an eighth water pipeline (34), the heat pump evaporator (7) is communicated with the fourth water pipeline (29) through a ninth water pipeline (35), a first hot water supply circulation control valve (11) is installed at the connection position of the seventh water pipeline (33) and the fourth water pipeline (29), a second heat storage water tank control valve (36) is installed at the connection position of the ninth water pipeline (35) and the fourth water pipeline (29), a second hot water storage water tank control valve (36) is installed at the connection position of the ninth water supply pipeline (32) and the fifth water pipeline (29), a second hot water circulation control valve (34) is installed at the position where the ninth water supply pipeline (32) and the fifth water pipe (30) are connected with a fifth water circulation control flue (10), and a fifth water circulation control valve (10) are respectively installed at the tail of the fifth water storage control flue of the fifth water heat exchanger (10), the second hot water storage tank control valve (36) is arranged close to the hot water storage circulating pump (13), the second hot water supply circulating control valve (37) is arranged close to the heat supply terminal (15), and the first hot water storage tank control valve (10) is arranged close to the hot water storage tank (2).

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