CN110397979B - Cold, heat and electricity triple supply new energy storage energy supply and peak shaving system - Google Patents

Abstract

The invention discloses a new energy storage and energy supply and peak shaving system with triple cold, heat and electricity supplies, which comprises the following components: the system comprises a new energy power generation subsystem, an industrial electromagnetic heating device, a fused salt storage tank subsystem, a fused salt type heat supply subsystem and a public power distribution network; the new energy power generation subsystem provides electric energy for the industrial electromagnetic heating device, the system self-load and the public power distribution network; the industrial electromagnetic heating device converts most of electric energy generated by the photovoltaic and wind power new energy power generation subsystem into heat energy which is stored by molten salt and externally supplies heat through the molten salt type heat supply subsystem, part of the electric energy can be supplied to the system for self-use, and the redundant electric energy can also supply power to a public power grid. The heat energy provided by the invention can provide heating heat sources, domestic hot water and concentrated refrigeration steam for users such as residents and offices, and also can provide industrial steam and deep power generation peak regulation steam; the problems of poor peak regulation performance of new energy power generation and difficult absorption in the field of new energy and wind and light abandoning are solved.

Description

A new energy storage and peak load regulation system for the trigeneration of cooling, heating and electricity

Technical Field

The present invention belongs to the field of new energy storage and supply, peak load regulation and consumption, and environmental protection, and specifically relates to a new energy storage and supply and peak load regulation system for the trigeneration of cooling, heating and electricity.

Background Art

For a long time, my country's energy consumption is still dominated by coal, and its damage to the ecological environment is well known, among which the main damage to the environment is caused by coal-fired power generation and coal-fired heating.

Coal-fired heating problem: In winter, urban residents need to rely on coal-fired cogeneration units to provide centralized heating; in rural heating, due to the dispersion of rural villages and investment cost restrictions, there is no condition for laying centralized heating pipelines. Therefore, most of the vast rural areas in northern my country still use homemade water circulation coal-fired heating furnaces for heating. In winter, the amount of coal burned has increased significantly, and haze is serious. The pressure of environmental pollution control in many places is very high and has become a serious problem; at the same time, the popularization of rural household water circulation coal-fired heating furnaces has aggravated this coal-fired pollution. This heating method has been popularized in rural areas for about 20 years. In the 1980s and 1990s, coal briquette stoves were mainly used for heating in rural areas. According to the survey, a rural family with an area of about 100 square meters used coal briquette stoves for heating in the era of heating, burning less coal, about 0.5 tons of coal a year, so the haze in northern China around the 1980s and 1990s was not as serious as it is now. Since the popularization of water circulation coal-fired heating furnaces, the consumption of scattered coal in rural areas has increased sharply. According to surveys, a rural family burns about 1.2 to 2 tons of coal a year for this heating method, and those with better conditions burn more. This method of burning scattered coal has no dust removal effect. In addition, the rural population in my country still accounts for the majority, about 56%, so the consumption of scattered coal has a greater impact on environmental pollution.

Coal-fired power generation: Although large-capacity coal-fired power generation units are equipped with desulfurization and dust removal devices, they still cannot completely eliminate smoke and dust emission pollution, which is still the main cause of atmospheric pollution. In order to solve the problem of urban environmental pollution, many cities have replaced coal-fired heating units with gas-fired heating units. As of the end of 2017, the country's gas-fired power generation capacity was 76.29 million kilowatts, of which more than 70% was cogeneration. However, my country does not have much natural gas resources. If we rely heavily on the development of gas-fired cogeneration to meet heating needs, it will inevitably affect the country's energy security. The "gas shortage" in the winter of 2017 is a typical example.

In order to improve the environment, some areas in northern my country have implemented a large number of coal-to-gas and coal-to-electricity projects. However, the actual application results are not ideal. One reason is that if coal-to-gas is completely adopted, natural gas will not be enough. If a large amount of natural gas is imported, it will pose a threat to national energy security. Another reason is that according to the current gas and electricity prices, the living consumption levels of most residents in urban fringe areas and rural areas in my country are not enough to support this kind of environmentally friendly but high consumption. It can also be said that the conditions for using "re-electrification" to eliminate environmental pollution are not met at present. One of the important reasons why ordinary people can afford to burn coal for heating but cannot afford to use electricity for heating is related to the energy conversion efficiency and the costs of each link of the conversion. The cycle thermal efficiency of converting chemical energy in fossil fuels such as coal into electrical energy is about 40%, plus the total cost of each energy conversion process in the middle, so the price converted to electricity for heating is much higher, which is unaffordable for the current consumption level of most ordinary people in my country (including urban residents). After calculation, the table below lists the comparative data of Taiyuan's winter heating with air conditioning and centralized heating. From this table, we can see that if the cost expenditure of switching from coal to gas or coal to electricity is considered according to the effect of centralized heating, the consumption cost of air conditioning heating is twice that of centralized heating. Combined with my country's economic development level, it is estimated that it will be difficult for ordinary people to reach the consumption level within 5 to 10 years.

In order to alleviate environmental pollution, countries around the world are vigorously developing new energy power generation. With the rapid development of the new energy power generation industry, the proportion of new energy power generation installed capacity in the entire power market is increasing. Due to its excellent environmental performance, new energy and other non-fossil energy (photovoltaic, wind power, hydropower, nuclear power) will inevitably be the main direction of my country's future energy development.

Although new energy power generation is developing rapidly, it has not yet occupied the mainstream proportion. And due to certain factors, its development speed has not been fully and rapidly released. These factors are mainly: wind power and photovoltaic power generation have poor flexibility, and are difficult to control artificially without effective and substantial breakthroughs in electric energy storage technology, and have poor peak-shaving performance; they have not yet been actually applied to people's heating through technological innovation, and cannot solve the winter heating needs of the people.

Because of the above factors, there is a serious phenomenon of wind and solar power abandonment at present. Especially during the winter heating period, the heating demand and contradiction are very prominent. Although gas-fired cogeneration is environmentally friendly, its heat-to-power ratio is much smaller than that of coal-fired cogeneration. In order to solve this problem of both environmental protection and heating, for example, the capital Beijing has had to export a large amount of electricity in winter in recent years. Therefore, it has to squeeze out more wind and photovoltaic power generation that can only generate electricity but not heat, which has exacerbated the contradiction of wind and solar power abandonment.

If a new energy storage, supply and peak-shaving system for cold, hot and electric trigeneration with energy storage, supply and peak-shaving functions can be designed, it will effectively solve the above contradictions and quickly open the bottleneck of the development of the new energy power generation industry. Moreover, this demand is very urgent in the current stage of increasing environmental pressure. In addition, with the improvement of people's living standards, urban steam refrigeration is quietly emerging. According to relevant statistics, the annual growth rate of steam refrigeration users has reached more than 25%. Steam refrigeration central air conditioning is energy-saving (saving about 30% of the cost compared with ordinary electric air conditioning) and environmentally friendly (can effectively reduce carbon dioxide emissions. Taking a 10,000 square meter building as an example: using steam air conditioning instead of electric air conditioning can reduce carbon dioxide emissions by 201.3 tons per year). In the environment of advocating low-carbon economy and energy conservation and consumption reduction, the development of this industry can not only greatly improve the comfort of citizens' lives, but also make certain contributions to the "clear water and blue sky" in cities and rural areas; the steam generated by the system can also be used for steam turbine generator sets to generate electricity and for deep peak-shaving of the power grid; and the system can also provide domestic hot water for distributed residential areas. Taking all these factors into consideration, this system can not only effectively solve the many contradictions in heating and power generation mentioned above, but also provide steam thermal energy guarantee for the construction and development of urban suburbs, new economic development zones, and socialist new rural areas and new towns with distributed characteristics.

Summary of the invention

In view of this, the present invention provides a new energy energy storage and peak-shaving system for the trigeneration of cooling, heating and electricity to solve the serious environmental pollution such as haze caused by burning scattered coal for heating in winter; solve the contradiction of abandoning wind and solar power in the new energy field due to heating in winter; solve a series of contradictions such as insufficient consumption levels brought about by "coal to electricity, coal to gas", solve the peak-shaving and consumption problems of new energy power generation, and provide a solution for the new energy power generation industry to quickly break through the development bottleneck.

To achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

A new energy energy storage and peak-shaving system for trigeneration of cooling, heating and electricity, comprising: a new energy power generation subsystem, an industrial electromagnetic heating device, a molten salt storage tank subsystem, a molten salt heating subsystem and a public power distribution network;

The new energy power generation subsystem provides electric energy for the industrial electromagnetic heating device and its own load, and the public power distribution network;

The industrial electromagnetic heating device converts most of the electric energy of the new energy power generation subsystem into heat energy which is stored in molten salt, and can be used for subsequent heating of people's livelihood and for initial peak regulation of the power grid;

The public power distribution network receives excess electric energy from the new energy power generation subsystem and provides backup power for the industrial electromagnetic heating device, the molten salt storage tank subsystem, and the molten salt heating subsystem when the new energy power generation subsystem fails or is disabled;

The molten salt storage tank subsystem is connected to the industrial electromagnetic heating device and is used to store and circulate the molten salt;

The molten salt heating subsystem is connected to the molten salt storage tank subsystem pipeline, and uses the molten salt thermal energy to heat the heating network circulating water and condensate water through the corresponding heat exchanger, thereby providing heating, domestic hot water and steam for centralized heating users.

Preferably, the new energy power generation subsystem is divided into three types: photovoltaic power station as the main power source during the day, and some wind turbines as backup power sources at night or for failures; wind turbines as the sole main power source; photovoltaic power station as the sole main power source.

Preferably, the photovoltaic power station subsystem includes photovoltaic modules, grid-connected inverters, transformers, grid-connected electric energy metering devices, user buses, and gateway electric energy metering devices. Part of the electric energy generated by the photovoltaic modules is transmitted to the industrial electromagnetic heating device through wires, and the other part of the electric energy is sent to the user bus through wires. Part of the electric energy on the user bus is used to power the self-carrying load of the molten salt storage tank subsystem and the self-carrying load of the molten salt heating subsystem. The other part of the remaining electric energy on the user bus is sent to the public distribution network through the gateway electric energy metering device.

Preferably, the wind power generation subsystem includes a wind turbine generator set, a rectifier, and a storage battery, and also includes a grid-connected inverter, a transformer, a grid-connected electric energy metering device, a user bus, and a gateway electric energy metering device that can be shared with the photovoltaic power station subsystem. Part of the electric energy generated by the wind turbine generator set is transmitted to the industrial electromagnetic heating device through wires passing through the rectifier and the storage battery, and the other part of the electric energy is sent to the user bus through wires. Part of the electric energy on the user bus is used to power the self-carrying load of the molten salt storage tank subsystem and the self-carrying load of the molten salt heating subsystem, and the other part of the remaining electric energy on the user bus is sent to the public distribution network through the gateway electric energy metering device.

Preferably, the molten salt storage tank subsystem includes a molten salt storage tank, a valve, a molten salt pump and a flow meter. The molten salt storage tank is provided with a lower first outlet, a lower first inlet and an upper first inlet. The lower first outlet of the molten salt storage tank is connected to the inlet of the molten salt pump through a pipeline. The flow meter is installed on the pipeline. The molten salt pump extracts hot liquid molten salt from the molten salt storage tank and delivers it to the molten salt heating subsystem through a pipeline. The outlet of the molten salt pump is divided into three pipelines: a first outlet pipe, a second outlet pipe and a third outlet pipe. The first outlet pipe is connected to the corresponding valve and then connected to the upper first inlet.

Preferably, the industrial electromagnetic heating device is a high-efficiency industrial heating device that utilizes the electromagnetic eddy current principle for heating. Its main internal structure includes a rectifier element, a thyristor element, an electromagnetic coil, and a control circuit. The rectifier element first converts alternating current into direct current, and then converts it into variable-frequency alternating current through the thyristor element. The alternating current generates high-frequency magnetic lines through the electromagnetic coil below the molten salt storage tank or wrapped around the outer wall of the molten salt storage tank, thereby utilizing the eddy current principle to heat the molten salt storage tank and convert the electrical energy generated by the new energy power generation subsystem into molten salt thermal energy for storage.

Preferably, the molten salt heating subsystem comprises: a molten salt hot water heat exchanger, a heat network circulation pump, a chemical water production tank, a condensate recovery tank, a condensate pump, a molten salt condensate heater, a molten salt steam generator and a molten salt steam superheater, the second outlet pipe is connected to the molten salt hot water heat exchanger through a pipeline provided with a valve, the heat network circulation pump pipeline is connected to the molten salt hot water heat exchanger, and is used to send the heat network circulating water to the molten salt hot water heat exchanger for heat exchange, heat the circulating water, and then send it to the centralized heating users for heating, the circulating water of the centralized heating users is returned to the inlet of the heat network circulation pump, and continues to circulate, the inlet of the heat network circulation pump is connected to the chemical water production tank, and new water can be added through the chemical water production tank when the pipeline pressure drops; The third outlet pipe is connected to the molten salt steam superheater, the molten salt steam generator, and the molten salt condensate heater in sequence through pipelines, and is used to heat the condensate into hot water or steam for providing domestic hot water and steam. The steam can be used as ordinary industrial heating steam. If necessary, the steam can also be supplied to the steam turbine generator system to generate electricity again to cooperate with the deep peak regulation of the power grid. The steam condenses and is recovered to the condensate recovery tank through a pipeline. The condensate pump is connected to the condensate recovery tank pipeline and is used to pump water from the condensate recovery tank. The water is sent to the molten salt condensate heater, the molten salt steam generator, and the molten salt steam superheater in sequence according to the process to absorb heat. When the pressure of the condensate recovery tank drops, new water can be added through the chemical water tank.

Preferably, the molten salt heating subsystem is provided with a reflux pipeline, which connects the molten salt hot water heat exchanger and the molten salt condensate water heater and converges to the lower first inlet of the molten salt storage tank, returning the cold molten salt after heat release to the molten salt storage tank.

Preferably, the industrial electromagnetic heating device is connected to each of the new energy power generation subsystems in two ways: direct current transmission and alternating current transmission.

Preferably, the DC transmission mode: a part of the electric energy generated by the new energy power generation subsystem is transmitted to the thyristor element of the industrial electromagnetic heating device through a wire provided with a DC circuit breaker, and the other part is transmitted to the user bus through a grid-connected inverter, a transformer, and an electric energy metering device connected in sequence by wires. The user bus is connected to the rectifier element through a wire as a backup power supply, and the rectifier element is directly connected to the thyristor element by a wire; the AC transmission mode: the electric energy generated by the new energy power generation subsystem is directly transmitted to the user bus through a grid-connected inverter, a transformer, and an electric energy metering device connected in sequence by wires. The user bus is connected to the rectifier element through a wire as a main power supply. When the new energy power generation subsystem fails or is temporarily disabled, the user bus is also used to provide a backup power supply for each power load.

Compared with the prior art, the present invention has the following beneficial effects:

1. The present invention solves the problem of how to effectively store, absorb and peak-load the energy of photovoltaic and wind power generation and convert it into thermal energy for heating of people's livelihood;

2. The present invention can use one or two of the photovoltaic power station subsystem and the wind power generation subsystem as power supply, use the industrial electromagnetic heating device and the molten salt storage tank subsystem to convert electrical energy into thermal energy for storage, complete the initial peak regulation of the power grid, and use the molten salt heating subsystem to provide domestic hot water, steam for centralized refrigeration and steam for other purposes, which can effectively improve people's quality of life, and innovatively combine electrical energy storage and conversion with the molten salt system and the people's livelihood field through the industrial electromagnetic heating device; if necessary, the generated steam can also be supplied to the steam turbine generator system for power generation again to complete the deep peak regulation effect, thereby effectively solving the problem of poor peak regulation performance of current new energy power generation, solving the problem of clean energy consumption, and effectively solving the problem of wind and solar power abandonment;

3. The industrial electromagnetic heating device used in the present invention is currently a very mature industrial heating equipment. The industrial electromagnetic heating device is used to heat the molten salt storage tank, thereby converting the electrical energy generated by the new energy power generation subsystem into thermal energy for storage by molten salt. The industrial electromagnetic heating device utilizes electromagnetic eddy current heating instead of conventional thermal resistance element conduction heating. The electric heat conversion efficiency is very high, reaching about 95% to 98%. It is an environmentally friendly heating solution that is actively advocated by the country. It has been maturely applied in advanced enterprises. The electric heat energy conversion efficiency of the ordinary resistance coil conduction heating method is only about 60 to 70%;

4. There are two ways to connect the power generation system of the present invention with the industrial electromagnetic heating device. The DC output of the new energy power generation subsystem is directly connected to the input end of the thyristor element of the industrial electromagnetic heating device through a DC circuit breaker, which can effectively reduce the capacity of the grid-connected inverter and transformer of the new energy power generation subsystem and reduce the cost;

5. The present invention can solve the problem that residents in rural and urban suburbs without centralized heating use scattered coal for heating and cause environmental pollution such as haze, thereby solving the difficulty of centralized heating for the planned construction of socialist new countryside and new towns;

6. The invention has a short construction period and quick results. Once successfully applied, transformed and vigorously promoted, it can effectively solve a series of social contradictions such as insufficient consumption levels caused by "coal to electricity, coal to gas", alleviate gas shortages, avoid "gas shortages" and ensure national energy security;

7. The present invention can effectively store the energy of photovoltaic power generation and wind power generation, and thus can effectively peak-load the power grid. With the expansion of the overall construction capacity, it can effectively solve the problems of poor peak-loading performance of photovoltaic and wind power generation and difficulty in absorbing new energy, and can effectively solve the contradiction of abandoning wind and light in the field of new energy due to heating in winter;

8. The present invention innovatively combines new energy power generation with energy storage, power grid peak regulation, heating for people's livelihood, steam supply, refrigeration and other industries by heating the molten salt storage tank with an electromagnetic heating device. This method of converting electrical energy into thermal energy for storage makes the construction cost of the entire system economical and reasonable due to the easy availability and low price of raw materials, which complies with the national industrial policy of energy conservation and environmental protection;

9. The present invention can store energy, provide heat and steam, and thus provide a solution for the new energy power generation industry to quickly break through the development bottleneck. Due to the maturity of long-distance heating technology, it solves the problem of wind power generation being limited to the sea, remote mountainous areas, remote wastelands or desert areas. It can effectively develop towards urban suburbs and rural areas, and towards densely populated areas and areas with people's livelihood needs. With its rapid and successful development, it can completely replace all functions of coal-fired machines, and is expected to completely solve the environmental pollution problem caused by coal burning.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

FIG1 is a system flow chart of Example 1 of the present invention;

FIG2 is a system flow chart of Example 2 of the present invention;

FIG3 is a system flow chart of Example 3 of the present invention;

FIG4 is a system flow chart of Example 4 of the present invention;

FIG5 is a system flow chart of Example 5 of the present invention;

FIG6 is a system flow chart of Example 6 of the present invention.

DETAILED DESCRIPTION

It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

Example 1

As shown in FIG1 , a new energy storage and peak-shaving system for trigeneration of cooling, heating and electricity includes: a new energy power generation subsystem, an industrial electromagnetic heating device 1, a molten salt storage tank subsystem 2, a molten salt heating subsystem 3 and a public power distribution network 4; the new energy power generation subsystem provides power to the industrial electromagnetic heating device 1 and its own load and the public power distribution network 4; the industrial electromagnetic heating device 1 converts the power of the new energy power generation subsystem into heat energy for storage by molten salt; the public power distribution network 4 receives the power of the new energy power generation subsystem The electric energy of the system, and at the same time, when the new energy power generation subsystem fails or is out of service, it provides backup power for the industrial electromagnetic heating device 1, the molten salt storage tank subsystem 2, and the molten salt heating subsystem 3; the molten salt storage tank subsystem 2 is connected to the industrial electromagnetic heating device 1, and is used to store and circulate the molten salt; the molten salt heating subsystem 3 is connected to the molten salt storage tank subsystem 2 by pipeline, and uses the molten salt thermal energy through the corresponding heat exchanger to heat the heating network circulating water and condensate water, thereby providing heating for centralized heating users, providing domestic hot water and providing steam.

The above-mentioned self-contained load is the self-contained load of the molten salt storage tank subsystem 2 and the self-contained load of the molten salt heating subsystem 3.

The new energy power generation subsystem is one or both of the photovoltaic power station subsystem 5 and the wind power generation subsystem 6. The new energy power generation subsystem is divided into three types: the photovoltaic power station subsystem 5 is used as the main power source during the day, and the wind power generation subsystem 6 is used as the backup power source at night or for failures; the wind power generation subsystem 6 is used as a separate main power source; and the photovoltaic power station subsystem 5 is used as a separate main power source.

The photovoltaic power station subsystem 5 includes a photovoltaic module 51, a grid-connected inverter 52, a transformer 53, a grid-connected electric energy metering device 54, a user bus 55, and a gateway electric energy metering device 56. Part of the electric energy generated by the photovoltaic module 51 is transmitted to the industrial electromagnetic heating device 1 through a wire, and the other part of the electric energy is sent to the user bus 55 through a wire. Part of the electric energy on the user bus 55 is used to power the self-contained load of the molten salt storage tank subsystem 2 and the self-contained load of the molten salt heating subsystem 3. The other part of the remaining electric energy on the user bus 55 is sent to the public distribution network 4 through the gateway electric energy metering device 56.

The wind power generation subsystem 6 includes a wind generator set 61, a rectifier 62, and a storage battery 63, and also includes a grid-connected inverter 52, a transformer 53, a grid-connected electric energy metering device 54, a user bus 55, and a gateway electric energy metering device 56 that can be shared with the photovoltaic power station subsystem. Part of the electric energy generated by the wind generator set 61 is transmitted to the industrial electromagnetic heating device 1 through the wires flowing through the rectifier 62 and the storage battery 63, and the other part of the electric energy is sent to the user bus 55 through the wires. Part of the electric energy on the user bus 55 is used to power the self-carrying load of the molten salt storage tank subsystem 2 and the self-carrying load of the molten salt heating subsystem 3, and the other part of the remaining electric energy on the user bus 55 is sent to the public distribution network 4 through the gateway electric energy metering device 56.

The molten salt storage tank subsystem 2 includes a molten salt storage tank 21, a valve, a molten salt pump 22 and a flow meter 23. The molten salt storage tank 21 is provided with a lower first outlet, a lower first inlet and an upper first inlet. The lower first outlet of the molten salt storage tank 21 is connected to the inlet of the molten salt pump 22 through a pipeline. The flow meter 23 is installed on the pipeline. The molten salt pump 22 extracts hot liquid molten salt from the molten salt storage tank 21 and delivers it to the molten salt heating subsystem 3 through a pipeline. The outlet of the molten salt pump 22 is divided into three pipelines: a first outlet pipe, a second outlet pipe and a third outlet pipe. The first outlet pipe is connected to the corresponding valve and then connected to the upper first inlet.

The bottom of the molten salt storage tank 21 is supported by a support 24, and the outermost surface of the molten salt storage tank 21 is covered with a heat-insulating material 25 to ensure heat transfer efficiency.

The number and type of all valves in this system do not reflect the specific number and fixed operating energy (electric or pneumatic). The industrial electromagnetic heating device, the corresponding number of heaters, the capacity of photovoltaic modules, and the number of wind turbines are not specified in detail. The design can be expanded accordingly according to actual needs. During the specific application test, the design unit will make detailed improvements according to actual needs. That is, the flow chart of this system is a principled system flow chart.

The industrial electromagnetic heating device 1 is a high-efficiency industrial heating device that utilizes the electromagnetic eddy current principle for heating. Its main internal structure includes a rectifier element 11, a thyristor element 12, an electromagnetic coil 13, and a control circuit. The rectifier element 11 first converts alternating current into direct current, and then converts it into variable-frequency alternating current through the thyristor element 12. The alternating current generates high-frequency magnetic lines through the electromagnetic coil 13 below the molten salt storage tank 21 or wound around the outer wall of the molten salt storage tank 21, thereby utilizing the eddy current principle to heat the molten salt storage tank 21, and converting the electrical energy generated by the new energy power generation subsystem into molten salt thermal energy for storage.

The molten salt heating subsystem 3 includes: a molten salt hot water heat exchanger 31, a heat network circulation pump 32, a chemical water tank 33, a condensate recovery tank 34, a condensate pump 35, a molten salt condensate heater 36, a molten salt steam generator 37 and a molten salt steam superheater 38. The second outlet pipe is connected to the molten salt hot water heat exchanger 31 through a pipeline provided with a valve. The heat network circulation pump 32 pipeline is connected to the molten salt hot water heat exchanger 31, which is used to send the heat network circulating water to the molten salt hot water heat exchanger 31 for heat exchange, heat the circulating water, and then send it to the centralized heating users for heating. The circulating water of the centralized heating users returns to the inlet of the heat network circulation pump 32 to continue to circulate. The inlet of the heat network circulation pump 32 is connected to the chemical water tank 33. The water tank 33 can be replenished with new water through the chemical water production tank 33 when the pipeline pressure drops; the third outlet pipe is connected to the molten salt steam superheater 38, the molten salt steam generator 37, and the molten salt condensate heater 36 in sequence through pipelines, and is used to heat the condensate into hot water or steam for providing domestic hot water and steam. The steam condenses and is recovered to the condensate recovery tank 34 through a pipeline. The condensate pump 35 is connected to the condensate recovery tank 34 pipeline and is used to pump water from the condensate recovery tank and send it to the molten salt condensate heater 36, the molten salt steam generator 37, and the molten salt steam superheater 38 in sequence according to the process to absorb heat. When the pressure of the condensate recovery tank 34 drops, new water can be replenished through the chemical water production tank 33.

The molten salt heating subsystem 3 is provided with a return pipe 39 , which connects the molten salt hot water heat exchanger 31 and the molten salt condensate water heater 36 and converges to the lower first inlet of the molten salt storage tank 21 , returning the cold molten salt after heat release to the molten salt storage tank 21 .

There are two ways of connecting the industrial electromagnetic heating device 1 with each of the new energy power generation subsystems: direct current transmission and alternating current transmission.

The DC power transmission mode: a part of the electric energy generated by the new energy power generation subsystem is transmitted to the thyristor element 12 of the industrial electromagnetic heating device 1 through a wire provided with a DC circuit breaker 7, and the other part is transmitted to the user bus 55 through a grid-connected inverter 52, a transformer 53, and a grid-connected electric energy metering device 54 connected in sequence by wires. The user bus 55 is connected to the rectifier element 11 through a wire as a backup power supply, and the rectifier element 11 is directly connected to the thyristor element 12 by a wire;

The AC power transmission mode: the DC line is eliminated, and the electric energy generated by the new energy power generation subsystem is directly transmitted to the user bus 55 through the grid-connected inverter 52, the transformer 53, and the grid-connected electric energy metering device 54 connected in sequence by wires. The user bus 55 is connected to the rectifying element 11 through wires as the main power supply.

This embodiment uses the photovoltaic power station subsystem 5 as the main power supply and the wind power generation subsystem 6 as the backup power supply. It is used as a backup power supply when the photovoltaic power station stops working at night and when the photovoltaic power station fails during the day. The capacity is designed according to a certain proportion based on its own load. When the photovoltaic power station subsystem 5 fails, the wind power generation subsystem 6 will not have excess electric energy to supply to the outside, and when the backup power supply capacity is insufficient, the backup power supply can be obtained from the public distribution network 4 through the user bus 55. When the photovoltaic power station subsystem 5 is normal, a part of the remaining electric energy mixed by the wind power generation subsystem 6 and the photovoltaic power station subsystem 5 and sent to the user bus 55 will be sent to the public distribution network 4 through the gateway electric energy metering device 56.

This embodiment adopts the DC power transmission mode to connect with the industrial electromagnetic heating device 1.

Example 2

As shown in FIG2 , on the basis of the above-mentioned embodiment 1, the connection between the new energy power generation subsystem and the industrial electromagnetic heating device 1 adopts the above-mentioned AC power transmission method, and the capacity of the grid-connected inverter 52, transformer 53 and other equipment is reselected according to the total power generation capacity. The other system arrangements are the same, which is the present embodiment.

Example 3

As shown in FIG3 , on the basis of the above-mentioned embodiment 1, the photovoltaic components 51 of the photovoltaic power station subsystem 5 are removed, and the scale and capacity of the wind turbine 61, the rectifier 62, and the storage battery 63 of the wind power generation subsystem 6 are expanded according to system requirements, and the wind turbine 61 is used as an independent main power supply. The layout of other systems is the same, which is the present embodiment.

Example 4

As shown in FIG4 , based on the above-mentioned embodiment 2, the photovoltaic components 51 of the photovoltaic power station subsystem 5 are removed, and the scale and capacity of the wind turbine 61, the rectifier 62, and the storage battery 63 of the wind power generation subsystem 6 are expanded according to system requirements. The wind turbine 61 is used as an independent main power supply, and the new energy power generation subsystem is connected to the industrial electromagnetic heating device 1 by AC transmission. The other system arrangements are the same, which is the present embodiment.

Example 5

As shown in FIG5 , based on the above-mentioned embodiment 1, the wind turbine generator set 61, the rectifier 62, and the battery 63 of the wind power generation subsystem 6 are removed, and the photovoltaic power station subsystem 5 is used as an independent main power supply. The power consumption of the self-contained load at night is provided by the public distribution network 4. The layout of other systems is the same, which is the present embodiment.

Example 6

As shown in FIG6 , based on the above-mentioned embodiment 2, the wind turbine generator set 61, the rectifier 62, and the battery 63 of the wind power generation subsystem 6 are removed, and the photovoltaic power station subsystem 5 is used as an independent main power supply. The power consumption of the self-contained load at night is provided by the public distribution network 4. The new energy power generation subsystem and the industrial electromagnetic heating device 1 are connected by AC transmission. The layout of other systems is the same, which is the present embodiment.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, component splitting or combination, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (4)

1. A new energy energy storage and peak load regulation system for trigeneration of cooling, heating and electricity, characterized in that it comprises: a new energy power generation subsystem, an industrial electromagnetic heating device, a molten salt storage tank subsystem, a molten salt heating subsystem and a public power distribution network; The new energy power generation subsystem is one of a photovoltaic power station subsystem, a wind power generation subsystem, and a wind-solar combined power generation subsystem. Part of the electric energy generated by the power generation subsystem is used to provide electric energy for the industrial electromagnetic heating device and its own load, and the other part is sent to the external power grid main network by the public distribution network; The industrial electromagnetic heating device converts most of the electric energy of the new energy power generation subsystem into heat energy and stores it in molten salt for subsequent heating for people's livelihood and initial peak regulation of the power grid; the industrial electromagnetic heating device is a high-efficiency industrial heating device that uses the principle of electromagnetic eddy current for heating, and its internal main structure includes a rectifier element, a thyristor element, an electromagnetic coil and a control circuit. The rectifier element first converts alternating current into direct current, and then converts it into variable-frequency alternating current through the thyristor element. The alternating current generates high-frequency magnetic lines through the electromagnetic coil under the molten salt storage tank or wrapped around the outer wall of the molten salt storage tank, thereby heating the molten salt storage tank using the eddy current principle, and converting the electric energy generated by the new energy power generation subsystem into molten salt heat energy for storage; The molten salt storage tank subsystem is connected to the industrial electromagnetic heating device and is used to store and circulate the molten salt; the molten salt storage tank subsystem includes a molten salt storage tank, a valve, a molten salt pump and a flow meter. The molten salt storage tank is provided with a lower first outlet, a lower first inlet and an upper first inlet. The lower first outlet of the molten salt storage tank is connected to the inlet of the molten salt pump through a pipeline. The flow meter is installed on the pipeline. The molten salt pump extracts hot liquid molten salt from the molten salt storage tank and delivers it to the molten salt heating subsystem through a pipeline. The outlet of the molten salt pump is divided into three pipelines: a first outlet pipe, a second outlet pipe and a third outlet pipe. The first outlet pipe is connected to the corresponding valve and then connected to the upper first inlet; The molten salt heating subsystem is connected with the molten salt storage tank subsystem pipeline, and uses the molten salt thermal energy to heat the heating network circulating water and condensate water through the corresponding heat exchanger, so as to provide heating, domestic hot water and steam for the centralized heating users; the molten salt heating subsystem includes: a molten salt hot water heat exchanger, a heating network circulating pump, a chemical water tank, a condensate recovery tank, a condensate pump, a molten salt condensate heater, a molten salt steam generator and a molten salt steam superheater, the second outlet pipe is connected with the molten salt hot water heat exchanger through a pipeline provided with a valve, the heating network circulating pump pipeline is connected with the molten salt hot water heat exchanger, and is used to send the heating network circulating water to the molten salt hot water heat exchanger for heat exchange, heat the circulating water, and then send it to the centralized heating users for heating, the circulating water of the centralized heating users returns to the inlet of the heating network circulating pump to continue to circulate, and the heating network circulating pump The inlet is connected to the chemical water production tank, and new water can be added through the chemical water production tank when the pipeline pressure drops; the third outlet pipe is connected to the molten salt steam superheater, the molten salt steam generator, and the molten salt condensate heater in sequence through the pipeline, and is used to heat the condensate into hot water or steam for providing domestic hot water and steam. The steam can be used as ordinary industrial heating steam. If necessary, the steam can also be supplied to the steam turbine generator system for power generation again to cooperate with the deep peak regulation of the power grid. The steam condenses and is recovered to the condensate recovery tank through the pipeline. The condensate pump is connected to the condensate recovery tank pipeline and is used to pump water from the condensate recovery tank and send it to the molten salt condensate heater, the molten salt steam generator, and the molten salt steam superheater in sequence according to the process to absorb heat. When the pressure of the condensate recovery tank drops, new water can be added through the chemical water production tank; The molten salt heating subsystem is provided with a return pipeline, which is connected to the molten salt hot water heat exchanger and the molten salt condensate water heater and is collected at the lower first inlet of the molten salt storage tank to return the cold molten salt after heat release to the molten salt storage tank; The public power distribution network, i.e., the external power grid, receives excess electric energy from the renewable energy power generation subsystem, and provides backup power for the industrial electromagnetic heating device, the molten salt storage tank subsystem, and the molten salt heating subsystem when the renewable energy power generation subsystem fails or is shut down. 2. According to claim 1, a new energy energy storage, supply and peak-shaving system for trigeneration of cooling, heating and electricity is characterized in that the photovoltaic power station subsystem includes photovoltaic modules, grid-connected inverters, transformers, grid-connected power metering devices, user buses, and gateway power metering devices. Part of the electric energy generated by the photovoltaic modules is transmitted to the industrial electromagnetic heating device through wires, and the other part of the electric energy is sent to the user bus through wires. Part of the electric energy on the user bus is used to supply power to the self-carrying load of the molten salt storage tank subsystem and the self-carrying load of the molten salt heating subsystem, and the other part of the remaining electric energy on the user bus is sent to the public distribution network through the gateway power metering device. 3. A new energy energy storage and peak-shaving system for trigeneration of cooling, heating and electricity according to claim 1, characterized in that the wind power generation subsystem includes a wind turbine, a rectifier, and a storage battery, and also includes a grid-connected inverter, a transformer, a grid-connected power metering device, a user bus, and a gateway power metering device that can be shared with the photovoltaic power station subsystem. A part of the electric energy generated by the wind turbine is transmitted to the industrial electromagnetic heating device through a wire passing through the rectifier and the storage battery, and another part of the electric energy is sent to the user bus through a wire. A part of the electric energy on the user bus is used to power the self-carrying load of the molten salt storage tank subsystem and the self-carrying load of the molten salt heating subsystem, and another part of the remaining electric energy on the user bus is sent to the public distribution network through the gateway power metering device. 4. According to the cooling, heating and electricity trigeneration new energy energy storage and peak regulation system described in claim 1, it is characterized in that the electrical connection between the industrial electromagnetic heating device and the new energy power generation subsystem has two modes of DC power supply and AC power supply.