CN114992700A - Energy storage type new forms of energy microgrid changes in temperature supply system - Google Patents

Abstract

The invention discloses an energy storage type new energy micro-grid cooling and heating supply system, comprising a centralized control platform, a medium and low temperature trough type heat collection system is arranged corresponding to the centralized control platform, and the medium and low temperature trough type heat collection system is connected with heat exchange equipment, The thermal equipment is connected with the geothermal utilization system, the cold and heat cycle system and the user terminal; it is also equipped with a new energy power generation system, as well as electrochemical energy storage devices and electrothermal energy storage devices configured in the new energy power generation system; during the heating period, through the centralized control platform Control: The medium and low temperature trough heat collection system and the geothermal utilization system collect heat, exchange heat through the heat exchange equipment to the cold and heat circulation system, and then supply heat to the end of the user; during the cooling period, control through the centralized control platform: use the reverse Carnot The circulation principle transfers heat from the underground energy to the hot and cold circulation system, and then provides cooling to the end of the user. The system of the invention has high utilization efficiency, strong system stability, high supply guarantee rate, strong applicability and certain practicability.

Description

An energy storage new energy microgrid cooling and heating supply system

technical field

The invention belongs to the technical field of auxiliary systems for comprehensive utilization of new energy, and in particular relates to an energy storage type new energy microgrid cooling and heating supply system.

Background technique

New energy has always attracted the attention of the market and people, and the realization of energy recycling and reuse has always been a relatively important technical concept. Clean energy heating refers to the use of natural gas, electricity, geothermal, solar energy, wind energy, industrial waste heat, and clean coal burning. , nuclear energy and other clean energy sources, and realize low-emission and low-energy heating methods through high-efficiency energy-consuming systems. At present, the commonly used clean energy heating methods include low-temperature flat-panel solar collector heating, geothermal energy as the cold/heat source through the ground source heat pump system for cooling/heating, comprehensive utilization of industrial waste heat for heating, natural gas distributed energy cooling/heating/electricity combined supply system.

The low-temperature flat-panel solar heat collection method is used for heating. Due to its own thermal insulation performance and heat collection method, the low-temperature flat-panel solar heat collection method has a low instantaneous efficiency intercept and a large heat loss coefficient, especially in cold areas and areas with insufficient power supply. Equipment failure or low supply efficiency can not effectively improve the heating guarantee rate, and the utilization rate is low. Using geothermal energy as the cooling/heating source to supply cooling/heating through the ground source heat pump system, the more conventional application is the primary shallow geothermal energy, and its essential principle is the reverse Carnot cycle. Taking advantage of the fact that the temperature of the normal temperature layer at the lower part of the outer heat layer of the surface is basically constant, the cold/heat is taken out from the ground by closing the U-shaped tube or the plane shallow circulation for cooling/heating of the building. In the actual operation process, no Considering the factors of difficulty and high cost of construction in remote areas, in cold areas, due to the low cooling load in summer and long heating time in winter, in a heating/cooling season cycle, the difference between the heating load and the cooling load is large, and the balance between cooling and heating cannot be achieved. In the long run, the temperature of the buried pipe area will be out of balance, which will affect the operation efficiency of the ground source heat pump unit. In addition, due to its large power consumption, stable power supply is required to ensure the operation of the unit. For remote areas lacking power, to meet its stable operation, the supporting microgrid system needs to be relatively large, which affects the overall economy of the project.

The cooling/heating/electricity combined supply system of natural gas distributed energy and the utilization system of industrial waste heat belong to clean energy heating. Natural gas has great strategic significance in the process of energy transformation, but in terms of the stability of gas supply and the distribution of natural gas There is a certain dependence on the selection of the core equipment of the cooling/heating/electricity combined supply system of the type energy. The industrial waste heat utilization system is based on industrial projects, and its own independence is poor.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an energy storage type new energy microgrid cooling and heating supply system, which solves the problems that the operation efficiency, cooling and heating balance and applicability of the current new energy heating/cooling system need to be further improved and optimized.

The technical scheme adopted in the present invention is,

An energy storage type new energy micro-grid cooling and heating supply system, comprising a centralized control platform, a medium and low temperature trough type heat collection system is arranged corresponding to the centralized control platform, the medium and low temperature trough type heat collection system is connected with heat exchange equipment, and the heat exchange equipment is connected with a Geothermal utilization system, hot and cold circulation system and user terminal; also equipped with new energy power generation system and electrochemical energy storage device and electric heat energy storage device configured in the new energy power generation system;

During the heating period, the centralized control platform controls the medium and low temperature trough heat collection system and the geothermal utilization system to collect heat, exchange heat to the cold and heat circulation system through the heat exchange equipment, and then supply heat to the end of the user;

During the cooling period, the centralized control platform controls the geothermal utilization system to use the reverse Carnot cycle principle to exchange heat from the underground energy to the cooling and heating cycle system, and then supply cooling to the end of the user.

The present invention is also characterized in that;

The medium and low temperature trough heat collecting system includes a medium and low temperature trough heat collecting device and a heat conduction transmission pipeline, and the heat exchange equipment is connected with the heat conduction transmission pipeline.

A heat collecting circulation system is also arranged between the medium and low temperature trough heat collecting device and the heat conduction transmission pipeline.

The geothermal utilization system includes a geothermal utilization device, a geothermal collection device, and a ground source circulation system disposed in both, and the geothermal utilization device is connected to the heat exchange equipment and the user terminal.

The cooling and heating circulation system includes a cold storage/hot water tank, a cooling/hot water circulation pump, and a cooling and heating circulation device connected with the heat exchange equipment.

The beneficial effects of the present invention are as follows: the present invention is an energy storage type new energy microgrid cooling and heating supply system, which can operate independently, has low external dependence, and is suitable for unstable power supply and remote and cold important places; the whole process of the system is green Energy, using a combination of various forms of energy storage, effectively combining long-term energy storage on the ground source side, flexible electrochemistry, high-grade electrothermal energy storage for easy recycling of abandoned electricity, and easy-to-storage water storage. Different grades of energy, high utilization efficiency of equipment and systems, strong system stability, and high supply guarantee rate;

The ground source side heat pump adopts the working principle of reverse Carnot cycle, and at the same time effectively solves the problem of unbalanced cooling and heating of underground pipes. , heat, electricity and domestic hot water, comprehensive configuration, strong applicability.

Description of drawings

1 is a schematic diagram of the system structure of an energy storage type new energy microgrid cooling and heating supply system of the present invention.

In the figure, 1. medium and low temperature trough heat collecting device, 2. heat conduction transmission pipeline, 3. heat collecting circulation system, 4. heat exchange equipment, 5. centralized control platform, 6. electric heat storage device, 7. geothermal utilization device , 8. Ground source circulation system, 9. Hot and cold circulation device, 10. Cold storage/hot water tank, 11. Cooling/hot water circulation pump, 12. New energy power generation device, 13. Electrochemical energy storage device, 14. Geothermal collection device, 15. User terminal.

Detailed ways

Hereinafter, an energy storage type new energy microgrid cooling and heating supply system of the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

An energy storage type new energy microgrid cooling and heating supply system of the present invention, please refer to FIG. 1, through the complementary and comprehensive utilization of solar energy, wind energy, geothermal energy and energy storage system, improve the reliability of cooling/heating and power supply, and meet the needs of the microgrid system. energy demand; the system consists of medium and low temperature trough heat collection system, heat conduction transmission pipeline 2, heat collection circulation system 3, heat exchange equipment 4, centralized control platform 5, electric heat storage device 6, geothermal utilization device 7, ground source circulation system 8. Cold and heat cycle device 9, cold storage/hot water tank 10, cooling/hot water circulation pump 11, new energy power generation system 12, electrochemical energy storage device 13, geothermal collection device 14, user terminal 15, etc. Through collection, storage, centralized control, and graded utilization, an energy comprehensive utilization system of an energy storage-type new energy microgrid cooling and heating power supply system is formed. The energy demand of the terminal is further dispatched through the centralized control platform 5, which avoids the current low operation efficiency of the new energy or clean energy cooling/heating power system, weak system independence, strong dependence on external energy supply, and system Thermal imbalance, etc.

The new energy power generation device 12 includes currently conventional and mature solar photovoltaic power generation, wind power generation and electric energy storage.

Different types of power generation are matched according to the resource conditions of the land of use.

The centralized control platform 5, including the collection, management and analysis of regional energy demand, and the output allocation of each energy supply system, is the control center of the energy storage type new energy microgrid cooling and heating power supply system.

The electrochemical energy storage device 13 is mainly configured to balance the internal power consumption equipment of the system and the power consumption demand in the micro-grid, and priority is allocated to ensure the power consumption demand for life and production. The energy storage device satisfies the output capacity of the maximum use load at the site of use, and the output time under the maximum load condition.

The electrothermal energy storage device 6 is used to solve the problem of a large range of power generation peak-to-valley variation in the new energy power system, and to recycle the power overflowed from the system to provide heat output when needed. Through the electrochemical energy storage device 13 , the electrothermal energy storage device 6 and the cooling and heating cycle device 9 , the scales of various types of energy storage devices are configured according to the comprehensive resource conditions, so as to ensure the energy demand of the land used.

The wind power generation needs to meet the nighttime basic load of the place of use. Preferably, 1-1.5 times of the nighttime basic load of the use site is selected to ensure the stable and reliable peak regulation effect of the energy storage device.

The new energy heat energy collection system is composed of medium and low temperature trough heat collection device 1 and heat conduction transmission pipeline 2 .

The medium and low temperature trough heat collector is a device that automatically tracks the sun for heat collection. It is characterized by high tracking accuracy and high thermal efficiency. The equipment structure adopts the self-designed light steel structure riveting structure.

The heat collection adopts a low freezing point and low volatile heat medium, and the stable conduction system collects heat, avoiding the tube burst and freezing failures of conventional solar collectors in cold areas.

The geothermal utilization system is based on the output power of the new energy power generation device, and uses the underground constant temperature heat as the cold/heat source to provide cooling capacity through the reverse Carnot cycle principle during the cooling period and provide heat during the heating period.

The geothermal utilization system includes a geothermal utilization device 7 , a ground source circulation system and a geothermal collection device 14 . The geothermal utilization device 7 is a mature and stable screw chiller unit, and the geothermal collection device 14 is a self-balancing pipeline system buried in the ground. The underground energy exchange is characterized by a small stable variation.

In the current operation process of many geothermal utilization systems, due to the mismatch between heating and cooling cycles, the supply ratio is unbalanced, and the temperature on the ground source side is unbalanced, resulting in low efficiency of geothermal utilization devices; Under certain conditions, the energy on the ground source side is supplemented, and the ground source side is also used as a heat storage body for energy storage.

Specifically, the main energy of this system is electrical energy and thermal energy collection. The thermal energy is collected by the medium and low temperature trough heat collector 1. The characteristics of tracking heat collection and high overall thermal efficiency of the equipment are used to improve the overall thermal efficiency of the system. The collected heat is sent to the heat exchange device 4 through the heat transfer pipe 2 . The power required by the system comes from the new energy power generation system 12 , and the stability of the system output is adjusted through the electrochemical energy storage device 13 , and the overflow energy is collected through the electrothermal energy storage device 6 .

During the heating period, the heat energy required for heating is supplied through two parts, one part is the heat collected by the medium and low temperature trough heat collecting system, and is stored in the cold storage/hot water tank 10 after heat exchange through the heat exchange equipment 4; the other part is from the geothermal heat Using the device 7, the underground storage energy is extracted and converted through the geothermal collection device 14, the heat required by the terminal is collected by the centralized control platform 5, and the cooling/hot water circulating pump 11 is dispatched to supply the heat required by the user terminal 15.

It should be noted that, during the heating operation of this embodiment, the amount of electricity sent by the new energy power generation system 12 will be abundant. The abundant electricity is collected and stored for supplementary use at night and when resources are insufficient, and it can also provide domestic hot water required at the end.

During the cooling period, the underground cooling energy is used as the driving force through the reverse Carnot cycle principle, the temperature of the water sent by the cold/hot water circulating pump 11 is further lowered, and the circulating water absorbs the cooling energy and stores it in the cooling/hot water supply. The circulating pump 11 is stored for maintaining the cooling effect during periods of poor resource conditions, and the cooling capacity required by the user terminal 15 is supplied by the cooling/hot water circulating pump 11 .

It should be noted that, during the cooling operation of this embodiment, the amount of electricity sent by the new energy power generation system 12 will also be abundant. and the electrothermal energy storage device 6 to store electrical energy and heat, and convert the surplus electricity into the cooling capacity required for cooling, which is stored in the cold storage/hot water tank 10 to maintain the cooling effect during periods of poor resource conditions.

During the non-cooling period, according to the monitoring data of the centralized control platform 5, the energy difference between the ground source side for cooling/heating is calculated. 6. Collect waste electricity heat for supplementation, and form long-term intertemporal energy storage.

It should be noted that, in order to ensure the operation of the system, the system is provided with a centralized control platform 5 to detect the energy flow of the user end and the energy supply end in real time. The new energy power generation system 12 is reasonably configured with different forms of power generation devices to complement each other's lack of power generation, while taking into account the power demand of the centralized control platform 5, storing and outputting energy through various forms of energy storage devices, and various energy supply forms to ensure Microgrid energy supply guarantee rate.

The invention is an energy storage type new energy micro-grid cooling and heating supply system. After the energy generated by the new energy power is stored by the power, part of it is directly supplied to the user end, and the other part is circulated to provide power to the energy supply system, and is comprehensively utilized through reasonable storage. The underground storage heat is used to supply cooling and heating to the system. The imbalance between cooling and heating in cold areas is supplemented by new energy thermal energy collection devices. The centralized control platform collects the energy consumption status of the user and sends out instructions to dynamically adjust the operating status of each energy supply system. To a certain extent, it avoids the problems of low operation efficiency of the current conventional new energy cooling/heating system, poor system independence and strong external dependence, and unbalanced cooling and heating of the system. It can better solve the daily life security problems in cold and remote areas, such as border guards, base stations and other personnel living for a long time, but the conditions are relatively difficult. It has good practical significance to improve the reliability of cooling and heating electricity and domestic hot water supply.

Claims (5)

1. The energy storage type new energy micro-grid cooling and heating supply system is characterized by comprising a centralized control platform (5), wherein a medium-low temperature trough type heat collecting system is arranged corresponding to the centralized control platform (5), the medium-low temperature trough type heat collecting system is connected with heat exchange equipment (4), and the heat exchange equipment (4) is connected with a geothermal utilization system, a cooling and heating circulation system and a user terminal (15); the system is also provided with a new energy power generation system (12), an electrochemical energy storage device (13) and an electrothermal energy storage device (6) which are arranged on the new energy power generation system (12);

in the heating period, the centralized control platform (5) controls the medium-low temperature trough type heat collection system and the geothermal utilization system to collect heat, and the heat is exchanged to the cold and heat circulation system through the heat exchange equipment (4) so as to supply heat to the tail end (15) of the user;

in the cold supply period, the centralized control platform (5) controls the geothermal utilization system to exchange heat of underground energy to a cold and hot circulation system by using the inverse Carnot cycle principle, and then the tail end (15) of the user is cooled.

2. The system for supplying cool and heat in an energy storage type new energy microgrid according to claim 1, characterized in that the medium-low temperature trough type heat collecting system comprises a medium-low temperature trough type heat collecting device (1) and a heat conduction transmission pipeline (2), and the heat exchange equipment (4) is connected with the heat conduction transmission pipeline (2).

3. The system for supplying cool and heat in an energy storage type new energy microgrid according to claim 2, characterized in that a heat collection circulation system (3) is further arranged between the medium and low temperature trough type heat collection device (1) and the heat conduction transmission pipeline (2).

4. The energy storage type new energy microgrid cooling and heating supply system according to claim 1, characterized in that the geothermal utilization system comprises a geothermal utilization device (7) and a geothermal collecting device (14), and a ground source circulation system (8) configured therebetween, wherein the geothermal utilization device (7) is connected to the heat exchange equipment (4) and a user terminal (15).

5. The energy storage type new energy microgrid cooling and heating supply system as claimed in claim 1, characterized in that the cooling and heating circulation system comprises a cold/hot water storage tank (10) and a cold/hot water supply circulation pump (11), and a cooling and heating circulation device (9) connected with the heat exchange equipment (4).

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