CN216522492U - Zero-carbon cold and hot supply system based on renewable energy coupling application - Google Patents
Zero-carbon cold and hot supply system based on renewable energy coupling application Download PDFInfo
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Abstract
The utility model discloses a zero-carbon cold and heat supply system based on renewable energy coupling application. The utility model can ensure the long-term stable operation of the heat exchange system of the intermediate-deep geothermal buried pipe based on the basic theory of heat transfer, and simultaneously combines the intermittent operation heat storage characteristic and the user side heat storage water tank, so that the intermediate-deep geothermal buried pipe has larger heat taking and regulating capacity, and can play a role of large-capacity peak regulation in a short time through the self heat exchange characteristic.
Description
Technical Field
The utility model relates to the technical field of geothermal energy utilization, in particular to a zero-carbon cold and heat supply system based on renewable energy coupling application.
Background
Carbon emission caused by energy consumption in the building field is an important component in the total carbon emission structure in China, and direct and indirect carbon emission caused by a heat supply and air conditioning system is important.
At present, in the heat supply heat source form in the building heat supply field of China, the proportion of traditional fossil energy including coal and fuel gas is still up to 88%. While the traditional fossil energy supplies heat by converting internal energy into heat energy through combustion, CO2 generated in the combustion process is one of the main greenhouse gases causing global warming. In the field of building cooling, key equipment such as a water chilling unit and the like are driven by mainly consumed power to extract heat from a building and discharge the heat to the outdoor environment. Because the power structure in China at present mainly generates electricity by traditional heat exchange energy sources such as coal, gas and the like, carbon emission caused by power consumption is also an important component in the whole carbon emission. Therefore, a low-carbon energy structure mainly based on zero-carbon energy, including efficient utilization of renewable energy and safe application of nuclear energy, must be vigorously developed, so that a great amount of traditional fossil energy is eliminated, and the aims of energy conservation and emission reduction are continuously achieved while high-quality social development is met. For the heating and cooling fields of buildings, the heating and power supply of renewable energy sources become the key points for realizing zero-carbon cold and heat supply.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects of the technology, the utility model provides a zero-carbon cold and hot supply system based on coupling application of renewable energy sources.
In order to solve the technical problems, the utility model adopts the technical scheme that: a zero-carbon cold and heat supply system based on coupling application of renewable energy sources comprises a middle-deep geothermal buried pipe unit, a heat source side water pump unit, a heat pump unit, a cooling side water pump unit, a cooling tower unit, an energy storage water pump unit, an energy storage water tank unit, a user side water pump unit, a building user unit and a photovoltaic power generation unit;
the medium-deep geothermal buried pipe unit is connected with the heat source side water pump unit, the heat source side water pump unit is connected with the heat pump unit, the cooling tower unit is connected with the cooling side water pump unit, the cooling side water pump unit is connected with the heat pump unit, the heat pump unit is connected with the energy storage water pump unit, the energy storage water pump unit is connected with the energy storage water tank unit, the energy storage water tank unit is respectively connected with the user side water pump unit, the user side water pump unit is connected with the building user unit, and the photovoltaic power generation unit is connected with the heat pump unit, the user side water pump unit, the energy storage water pump unit, the heat source side water pump unit, the cooling side water pump unit and the cooling tower unit.
Further, the middle-deep geothermal buried pipe unit comprises a middle-deep geothermal buried pipe, and the depth of the middle-deep geothermal buried pipe is 2-3 kilometers.
Furthermore, the heat source side water pump unit comprises two variable frequency water pumps which are connected in parallel, and the working frequency of each variable frequency water pump is 25-50 Hz; the heat pump unit comprises a high-efficiency heat pump unit.
Further, the cooling tower unit comprises a set of cooling tower groups; the cooling side water pump unit comprises two cooling water pumps which are connected in parallel, and the working frequency of each cooling water pump is 25-50 Hz.
Further, the energy storage water pump unit comprises at least one energy storage water pump; the energy storage water tank unit comprises an energy storage water tank.
Furthermore, the user side water pump unit comprises two user side water pumps, and the working frequency of each user side water pump is 25-50 Hz.
Further, the building user units are the actual heating and cooling terminals.
Further, the photovoltaic power generation unit includes a photovoltaic panel that provides clean power for the entire system operation.
The utility model discloses a zero-carbon cold and heat supply system based on coupling application of renewable energy sources, which is based on the basic theory of heat transfer science, can ensure the long-term stable operation of a heat exchange system of a middle-deep geothermal buried pipe, and simultaneously combines the intermittent operation heat storage characteristic and a user side heat storage water tank, so that the middle-deep geothermal buried pipe has larger heat taking and regulating capacity, and can play a role of large-capacity peak regulation in a short time through the self heat exchange characteristic. According to the meteorological conditions and the building functions of the location of the project, detailed analysis and measurement of the hourly heating load of the heating season and the hourly cooling load of the cooling machine are carried out, and the actual heating and cooling requirements of the project are determined. And determining the accumulated heat taking quantity of the single-opening middle-deep geothermal buried pipe according to the geological geothermal conditions of the project location. The powered building area that a modular zero-carbon cold and heat supply system can assume is then determined. And then, according to the annual accumulated cooling and heating power consumption and the annual solar radiation intensity, the whole power consumption demand is provided by photovoltaic power generation, and the laying area of the photovoltaic panel is calculated. All cold and heat in the day are obtained during typical solar photovoltaic power generation of cold supply and heat supply, and the capacity of a heat pump machine assembling machine, the capacity of an energy storage system, and the corresponding capacity of a cooling tower and a transmission water pump are determined. Secondly, to distributed building distribution, adopt near exploitation middle and deep geothermal ground pipe laying, set up the mode of zero carbon cold and hot supply system of modularization nearby, avoid on the one hand concentrating the exploitation middle and deep geothermal ground pipe laying to have the condition that the heat transfer influences each other, on the other hand cancel large tracts of land courtyard pipe network and avoid pipe network heat leakage loss, water conservancy imbalance scheduling problem, reduce simultaneously and carry the energy consumption.
Drawings
Fig. 1 is a schematic diagram of a zero-carbon cold and heat supply system based on renewable energy coupling application.
Fig. 2 is a schematic diagram of a design method of a zero-carbon cold and heat supply system based on renewable energy coupling application.
In the figure: 1. a middle-deep geothermal buried pipe unit; 2. a heat source side water pump unit; 3. a heat pump unit; 4. a cooling side water pump unit; 5. a cooling tower unit; 6. an energy storage water pump unit; 7. an energy storage water tank unit; 8. a user side water pump unit; 9. a building subscriber unit; 10. a photovoltaic power generation unit.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, a modularized zero-carbon cold and heat supply system based on renewable energy coupling application includes a mid-deep geothermal buried pipe unit, a heat source side water pump unit, a heat pump unit, a cooling side water pump unit, a cooling tower unit, an energy storage water pump unit, an energy storage water tank unit, a user side water pump unit, a building user unit, and a photovoltaic power generation unit.
The medium-deep geothermal buried pipe unit is connected with the heat source side water pump unit, the heat source side water pump unit is connected with the heat pump unit, the cooling tower unit is connected with the cooling side water pump unit, the cooling side water pump unit is connected with the heat pump unit, the heat pump unit is connected with the energy storage water pump unit, the energy storage water pump unit is connected with the energy storage water tank unit, the energy storage water tank unit is connected with the user side water pump unit, the user side water pump unit is connected with the building user unit, and the photovoltaic power generation unit is connected with the heat pump unit, the user side water pump unit, the energy storage water pump unit, the heat source side water pump unit, the cooling side water pump unit and the cooling tower unit.
Wherein, the middle-deep geothermal buried pipe unit comprises a middle-deep geothermal buried pipe, and the depth of each middle-deep geothermal buried pipe is 2-3 kilometers. The medium-deep geothermal buried pipe is only suitable for heat taking and supplying in winter due to high temperature of the medium-deep geothermal energy, heat cannot be discharged in summer, the requirement for recovering the soil temperature in long-term operation is considered, and the recommended accumulated heat taking amount of the medium-deep geothermal buried pipe under different geothermal geological conditions is different, and the medium-deep geothermal buried pipe is also the content which needs to be considered in design. Because the system adopts intermittent heat storage operation, the intermittent operation heat output of the intermediate-deep geothermal buried pipe is greatly increased compared with the continuous operation, and the peak instantaneous heat taking capacity is not the design key of the system.
The heat source side water pump unit comprises two variable frequency water pumps, the frequency of the water pumps is 25Hz-50Hz adjustable, and the flow is 20m3/h-40m3The/h is continuously adjustable. The heat pump unit comprises a high-efficiency heat pump unit which can supply cold in summer and heat in winter.
Heating working conditions in winter:
1) the heat source pump drives heat source water, heat is extracted from soil through a middle-deep geothermal buried pipe, then the heat source water enters the heat pump unit, after the temperature of the heat pump unit is raised and heated, heat is stored in the user side energy storage water tank, and the user side energy storage water tank supplies heat to building users at the same time.
2) The solar photovoltaic power generation is responsible for the power consumption of the whole system. When the solar energy generating capacity is sufficient in the daytime, the heat pump system stores heat under high load, and the residual heat of building heat supply is stored in the energy storage water tank, so that the solar photovoltaic generating capacity is fully absorbed.
3) And when the solar energy generating capacity is insufficient at night or in cloudy days, the heat stored in the energy storage water tank is used for supplying heat to the building, the heat pump system stops running, and at the moment, a small amount of municipal electric power is consumed to drive the water pump at the user side to run, so that the use of the minimum municipal electric power is realized.
Cooling working condition in summer:
1) the energy storage water tank absorbs heat from the building to realize the function of supplying cold to the building, and the heat pump unit absorbs heat from the energy storage water tank to realize the function of storing cold for the energy storage water tank. The absorbed heat is heated by the heat pump unit and then discharged to a cooling water system, and then the cooling pump drives cooling water to discharge the heat to the air through the cooling tower.
2) The solar photovoltaic power generation is responsible for the power consumption of the whole system. When the solar energy generating capacity is sufficient in the daytime, the heat pump system is in high-load cold accumulation, and the cold energy left by cold supply of the building is stored in the energy storage water tank, so that the solar photovoltaic generating capacity is fully absorbed.
3) And when the solar energy generating capacity is insufficient at night or in cloudy days, the cold energy stored in the energy storage water tank is used for cooling the building, the heat pump system stops running, and at the moment, a small amount of municipal electric power is consumed to drive the water pump at the user side to run, so that the use of the minimum municipal electric power is realized.
The rated heating working condition is that the temperature of water supply and return at the condensation side is 45/40 ℃, the temperature of water supply and return at the evaporation side is 20/10 ℃, and the heating COP (heating COP refers to the ratio of the heating quantity to the consumed power of the electric drive heat pump unit) can reach 6.0. The rated refrigeration working condition is that the temperature of water supply and return at the condensation side is 30/35 ℃, the temperature of water supply and return at the evaporation side is 7/12 ℃, and the refrigeration COP (coefficient of performance) is 5.5. The cooling tower unit comprises a set of cooling tower group, the frequency of the fan is adjustable from 25Hz to 50Hz, and the continuous adjustment of heat removal is realized. The cooling side water pump unit comprises two cooling water pumps, the frequency of the water pumps is adjustable from 25Hz to 50Hz, and the continuous adjustment of the flow is realized. The energy storage water pump unit comprises two energy storage water pumps, one energy storage water pump is used for standby, the frequency of the water pump is adjustable from 25Hz to 50Hz, and the continuous adjustment of the flow is realized. The energy storage water tank unit comprises an energy storage water tank, the design heat storage water temperature is 60/50 ℃, and the design cold storage water temperature is 4/14 ℃; the user side water pump unit comprises two user side water pumps, the frequency of the water pumps is adjustable from 25Hz to 50Hz, and the continuous adjustment of the flow is realized. The building subscriber units are the actual heating and cooling terminals. The photovoltaic power generation unit contains a photovoltaic panel and provides clean power for the operation of the whole system.
Compared with the traditional geothermal energy utilization technology, the heat supply technology of the buried pipe heat pump of the middle-deep geothermal energy has the advantages of high heat source temperature, large heat taking quantity, stable system operation, high performance, small occupied area, underground water resource protection and the like, is not influenced by ground climate conditions, can realize the clean, high-efficiency and continuous utilization of the middle-deep geothermal energy, and is a clean and high-efficiency heat supply technology of renewable energy with higher quality. The photovoltaic power generation technology converts solar energy into zero-carbon electric power, and drives a heat pump heating system to take heat from the middle and deep geothermal energy in a heating season, so that zero-carbon heating of the building is realized. Meanwhile, the heat pump cooling system is driven by the cooling machine to take heat from the building, and the heat is discharged to the outside by combining key equipment such as a cooling tower and the like, so that zero-carbon cooling is realized, and the heat pump cooling system becomes the core of the utility model.
In the application of heat supply, the occupancy ratio of renewable energy is up to more than 80%, the electrification of heat supply is realized, the emission of carbon dioxide in unit heat supply is only 30-40kg/GJ, and the aim of zero-carbon heat supply can be realized along with the driving of clean electric power.
The solar energy power generation system has the advantages that the photovoltaic power generation technology generates clean electricity capable of being generated by fully utilizing solar radiation, and the clean electricity is used for driving the heat pump system to supply heat and cool for the tail end of the building, so that the aims of zero-carbon heat supply and cool supply are achieved.
According to the utility model, a user side energy storage system is adopted to decouple continuous cooling and heating demands of building users from cold and heat preparation at the source side, the source side can flexibly select the starting operation time according to the power generation condition of solar photovoltaic and the production and transmission condition of clean power of a municipal power grid, heat and cold are fully prepared and stored in the energy storage water tank, and the continuous cooling and heating demands of the building users can be met through intermittent operation. Therefore, the zero-carbon clean power can be fully consumed, and the supply of zero-carbon cold and heat can be further realized.
The utility model fully utilizes the characteristics that the transverse floor area of the buried pipe of the intermediate-deep geothermal floor is small, the pipe diameter is only 200 plus 300mm, and the exploitation can be flexibly arranged, and combines the modularized heat pump unit, the water pump, the energy storage water tank and the cooling tower to construct the modularized zero-carbon cold and hot supply system. Hug closely building red line dispersion exploitation middle-deep geothermal ground pipe laying, set up the mode of zero carbon cold and hot supply system of modularization nearby, avoid concentrating the exploitation middle-deep geothermal ground pipe laying to have the condition that the heat transfer influences each other on the one hand, on the other hand cancels large tracts of land courtyard pipe network and avoids pipe network heat leakage loss, water conservancy imbalance scheduling problem, reduces simultaneously and carries the energy consumption.
As shown in fig. 2, the method for a zero-carbon cold and heat supply system based on renewable energy coupling application of the present invention specifically includes the following steps:
according to meteorological conditions and building functions of the location of a project, carrying out detailed analysis and measurement of a hourly heat supply load of a heat supply season and a hourly cooling load of a cooling machine to obtain hourly heat supply and cooling demands, and then determining a peak heat supply load, an accumulated heat supply load, a peak cooling load and an accumulated cooling capacity;
step two, defining geothermal geological conditions of the project location, including soil heat conductivity coefficient and temperature rise gradient, and selecting proper size and construction flow of the buried pipe according to the geological conditions;
thirdly, calculating a recommended value of the accumulated heat taking amount of the single-opening middle-deep geothermal buried pipe according to the annual average temperature drop of the soil not greater than 0.2 ℃ in combination with the geothermal geological conditions, and further determining the energy supply area capable of being borne by a modular system according to the required accumulated heat taking amount; the recommended value formula of the accumulated heat taking amount of the deep geothermal buried pipe is as follows:
Qa＝Fg·qc·Δτ+Fg·H·ρ·Ct·ΔT；
wherein Q isaThe recommended value of heat quantity is obtained for the year-round accumulation of the buried pipe of the middle-deep geothermal ground in GJ unit; fgThe cross section area of a soil control body is square meter; q. q.scThe unit is W/square meter of local geothermal heat flow density; Δ τ is one year time, in units of s; h is the depth of the buried pipe of the middle-deep geothermal floor in m; rho is the soil density in kg/m3(ii) a Ct is the specific heat capacity of the soil, and the unit kJ/(kg. DEG C); delta T is the annual temperature change of the soil control body; qh，aThe heat supply quantity of the heat pump system all year round after inputting electric power is considered, and the unit is GJ; COPhThe heat supply efficiency of the heat pump system can be 5.0; fcThe energy supply area which can be borne by a modular system is square meter; q. q.sh，aThe unit of GJ/square meter is the annual heat supply per unit area of the target project.
Step four, after determining the energy supply area, the cooling and heating requirements borne by a modular system can be determined;
Qc，a＝qc，a*Fc；
Qh，max＝qh，max*Fc；
Qc，max＝qc，max*Fc；
wherein Q isc，aThe unit kWh is the accumulated cooling capacity all year round; q. q.sc，aThe unit area of the target project is supplied with cold energy all the year round, and the unit kWh/square meter is used. FcThe energy supply area which can be borne by a modular system is square meter; qh，maxPeak heat supply for the target project, unit kW; qc，maxSupplying cooling capacity for the peak of the target project, wherein the unit of the cooling capacity is kW; q. q.sh，maxThe peak heat load per unit area is the target project, and the unit is W/square meter; q. q.sc，maxPeak cold load per unit area of the target project, unit W/square meter;
step five, estimating the annual accumulated power consumption of a modular system by using a heat supply system COP5.0 and a cold supply system COP 4.5;
wherein, W is the annual power consumption of the system and the unit kWh; COPcThe cooling efficiency of the heat pump system can be 4.5;
step six, combining the annual solar radiation intensity, providing all power consumption requirements of the modular system through photovoltaic power generation, calculating the laying area of a photovoltaic panel, and then obtaining the annual hourly power generation amount of the photovoltaic;
step seven, starting the heat pump system to operate during photovoltaic power generation for typical cooling and heating days to prepare all cooling and heating loads required by the current day, and determining the cooling and heating installed capacities of the heat pump unit and the capacity of the heat storage water tank;
Qhp，h＝Ps*COPhp，h；
Qhp，c＝Ps*COPhp，c；
Qhp＝Max(Qhp，h，Qhp，c)；
V＝Ps，a*COPhp，h；
wherein Qhp，hThe unit kW is the heat supply installed capacity of the heat pump unit; p issDesigning power generation power for photovoltaic, wherein the unit kW is; COPhp，hThe rated heat supply performance of the heat pump unit can be 6.0; qhp，cThe unit kW is the cooling and installation capacity of a heat pump unit; COP (coefficient of Performance)hp，cThe rated cooling performance of the heat pump unit can be 5.5; qhpFor comprehensive installed capacity of heat pump unit, Q is takenhp，hAnd Qhp，cMaximum, in kW; v is the energy storage capacity of the energy storage water tank, and the unit kWh; ps，aThe unit kWh is the cumulative power generation of a typical daily photovoltaic system;
and step eight, determining the installed capacity of a water pump at the user side by the temperature difference 5K between the water supply and the water return at the user side, determining the installed capacity of the water pump at the energy storage water supply and the water return by the temperature difference 10K between the water supply and the water return at the cooling side, determining the installed capacity of the cooling water pump by the temperature difference 5K between the water supply and the water return at the cooling side, and determining the installed capacity of the water pump at the heat source side by the temperature difference 10K between the water supply and the water return of the buried pipe of the middle-deep geothermal floor.
The above embodiments are not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make variations, modifications, additions or substitutions within the technical scope of the present invention.
Claims (8)
1. A zero-carbon cold and hot supply system based on renewable energy coupling application is characterized in that: the zero-carbon cold and heat supply system comprises a middle-deep geothermal buried pipe unit (1), a heat source side water pump unit (2), a heat pump unit (3), a cooling side water pump unit (4), a cooling tower unit (5), an energy storage water pump unit (6), an energy storage water tank unit (7), a user side water pump unit (8), a building user unit (9) and a photovoltaic power generation unit (10);
the medium-deep geothermal buried pipe unit (1) is connected with a heat source side water pump unit (2), the heat source side water pump unit (2) is connected with a heat pump unit (3), a cooling tower unit (5) is connected with a cooling side water pump unit (4), the cooling side water pump unit (4) is connected with the heat pump unit (3), the heat pump unit (3) is connected with an energy storage water pump unit (6), the energy storage water pump unit (6) is connected with an energy storage water tank unit (7), the energy storage water tank unit (7) is respectively connected with a user side water pump unit (8), the user side water pump unit (8) is connected with a building user unit (9), the photovoltaic power generation unit (10) is connected with the heat pump unit (3), the user side water pump unit (8), the energy storage water pump unit (6), the heat source side water pump unit (2), the cooling side water pump unit (4) and the cooling tower unit (5).
2. The zero-carbon cold and heat supply system based on renewable energy coupling application of claim 1, characterized in that: the middle-deep geothermal buried pipe unit (1) comprises a middle-deep geothermal buried pipe, and the depth of the middle-deep geothermal buried pipe is 2-3 kilometers.
3. The zero-carbon cold and heat supply system based on renewable energy coupling application of claim 2, characterized in that: the heat source side water pump unit (2) comprises two variable frequency water pumps which are connected in parallel, and the working frequency of each variable frequency water pump is 25-50 Hz; the heat pump unit (3) comprises a high-efficiency heat pump unit.
4. The zero-carbon cold and heat supply system based on renewable energy coupling application of claim 3, characterized in that: the cooling tower unit (5) comprises a set of cooling tower groups; the cooling side water pump unit (4) comprises two cooling water pumps which are connected in parallel, and the working frequency of each cooling water pump is 25-50 Hz.
5. The zero-carbon cold and heat supply system based on renewable energy coupling application of claim 4, characterized in that: the energy storage water pump unit (6) comprises two energy storage water pumps which are connected in parallel, and only one energy storage water pump runs when the energy storage water pump unit is used; the energy storage water tank unit (7) comprises an energy storage water tank.
6. The zero-carbon cold and heat supply system based on renewable energy coupling application of claim 5, characterized in that: the user side water pump unit (8) comprises two user side water pumps, and the working frequency of each user side water pump is 25-50 Hz.
7. The zero-carbon cold and heat supply system based on renewable energy coupling application of claim 6, characterized in that: the building user unit (9) is the actual heating and cooling end.
8. The zero-carbon cold and heat supply system based on renewable energy coupling application of claim 7, characterized in that: the photovoltaic power generation unit (10) includes a photovoltaic panel that provides clean power for the overall system operation.
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| CN116025943A (en) * | 2022-11-28 | 2023-04-28 | 中国能源建设集团湖南省电力设计院有限公司 | Zero-carbon heating system of medium-deep geothermal energy coupling light storage system |
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