CN110829470A - A power grid peak regulation system based on molten salt heat storage - Google Patents

Abstract

The invention discloses a power grid peak regulation system based on molten salt heat storage, comprising a molten salt energy storage and heat release system and a steam heat supply system; a cooling system is connected between the molten salt heat storage and heat release system and the steam heat supply system The medium transmission pipeline and the heat medium transmission pipeline, the molten salt energy storage and heat release system and the steam heating system form a medium circulation through the cold medium transmission pipeline and the heat medium transmission pipeline; the heating element of the molten salt energy storage and heat release system is connected to The power generation device is electrically connected, and the steam heating system provides high-temperature steam for users. The power grid peak regulation system based on molten salt heat storage according to the present invention can convert excess electric energy into heat energy and use it for users during peak electricity consumption.

Description

A power grid peak regulation system based on molten salt heat storage

technical field

The invention relates to a power grid peak regulation energy storage system, in particular to a power grid peak regulation system based on molten salt heat storage.

Background technique

With the support of the national renewable energy policy, the scale of wind and photovoltaic power generation continues to expand, making electric energy resources more abundant, and the market competitiveness of clean energy continues to increase. , some power plants cannot operate at full load, which increases the difficulty of peak regulation of the power grid, and the phenomenon of local consumption is difficult and the utilization rate is insufficient.

SUMMARY OF THE INVENTION

Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a power grid peak regulation system based on molten salt heat storage, so as to make full use of unconsumed electric energy and improve the utilization rate of electric energy.

Technical solution: In order to achieve the above purpose, a power grid peak regulation system based on molten salt heat storage of the present invention includes a molten salt energy storage and heat release system and a steam heat supply system; the molten salt energy storage and heat release system and the steam supply system. A cold medium transmission pipe and a heat medium transmission pipe are connected between the heat systems, and the molten salt energy storage and heat release system and the steam heating system form a medium circulation through the cold medium transmission pipe and the heat medium transmission pipe; the molten salt energy storage system The heating element of the exothermic system is electrically connected with the power generating device, and the steam heating system provides high temperature steam for the user.

Further, the molten salt is a ternary molten salt of 53% KNO ₃ -7% NaNO ₃ -40% NaNO ₂ .

Further, the steam heating system is communicated with the user equipment through a steam output pipe and a water input pipe, a water tank is communicated between the water input pipes, and a trap is arranged between the water tank and the user equipment.

Further, a first valve, a first temperature sensor, a pressure sensor, a pressure gauge, a safety valve and a first shut-off valve are sequentially arranged on the steam output pipeline from the steam heating system side to the user side.

Further, a second valve, a water pump and a second shut-off valve are sequentially arranged on the steam-water input pipeline from the steam heating system to the side of the water tank.

Further, the water tank is provided with a water replenishing port, an exhaust port and a sewage outlet.

Further, the water tank includes a steam box and a liquid box, the liquid box cover is arranged outside the steam box, the top of the steam box is provided with a spiral steam pipe, and the steam pipe is arranged in the liquid box, so The inner cavity of the steam box is communicated with the inner cavity of the steam pipe; the bottom of the steam box is communicated with the liquid box through a one-way valve, the exhaust port is communicated with the steam box, and the sewage outlet and the water supply port are communicated with the liquid box. .

Further, the heat medium transmission pipeline is sequentially provided with a second temperature sensor, a third valve, a high temperature molten salt pump, an electric regulating valve, a filter, a flow meter and Fourth valve.

Further, a fifth valve, a low-temperature molten salt pump and a sixth valve are sequentially arranged on the cold medium transmission pipeline from the molten salt energy storage and heat release system to the steam heating system side.

Further, the molten salt energy storage and heat release system includes a molten salt heat storage tank, the heating element is an electric heating rod, and the electric heating rod is arranged in the molten salt heat storage tank; the molten salt heat storage tank A safety valve is provided on the tank.

The beneficial effects of the present invention are as follows: a power grid peak regulation system based on molten salt heat storage, which heats molten salt in a low power consumption period (such as 23:00-7:00), and converts excess electric energy into molten salt The thermal energy of the salt is then used in the peak period of electricity consumption, and the thermal energy stored in the molten salt is used to generate hot steam to provide to users, which has the effect of shaving peaks and filling valleys for the power grid system. The peak shaving system of the invention participates the molten salt heat load in the power load scheduling, reduces the power load of the thermal power unit, can flexibly participate in the peak shaving of the power grid, and improves the economic benefit of the power system; The advantages of simplicity, safe and stable operation, and the requirements of the country's energy-saving and emission-reduction policies, have good economic and environmental benefits.

Description of drawings

Accompanying drawing 1 is the principle schematic diagram of the device;

Figure 2 is a cross-sectional view of the water tank according to the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

A power grid peak regulation system based on molten salt heat storage as shown in FIG. 1 includes a molten salt energy storage and heat release system and a steam heating system. The molten salt energy storage and heat release system includes a molten salt energy storage tank 1, the molten salt energy storage tank 1 is provided with a safety valve 3, and a heating element 2 is provided in the molten salt tank 1, and the heating element adopts electric power. Heater. The molten salt energy storage tank 1 contains molten salt, the molten salt is 53%KNO3-7%NaNO3-40%NaNO2 ternary molten salt (HTS), the HTS ternary molten salt has a low melting point, It has the advantages of low viscosity, low vapor pressure, large specific heat capacity, high heat storage and low price. The electric heating rod is connected with the power generating device, and the electric heating rod converts the excess electric energy into the heat energy of the molten salt.

The molten salt energy storage and heat release system includes a steam generator 8, and the steam generator 8 communicates with the molten salt energy storage tank through a heat medium transmission pipeline and a cold medium transmission pipeline. The steam generator 8 and the molten salt energy storage tank 1 form a circulation passage through the heat medium transmission pipeline and the cold medium transmission pipeline. The high-temperature molten salt is input into the steam generator 8 through the heat medium transmission pipeline, and the liquid water in the steam generator is heated to form steam, and the cooled molten salt is returned to the molten salt storage tank through the cold medium transmission pipeline for reheating. , and so on and so forth; the high-temperature steam generated by the steam generator is used by the user 17 .

A water tank 15 is arranged between the steam generator and the user's equipment, and a steam trap 14 is arranged between the water tank 15 and the pipeline of the user's equipment. The steam generated by the steam generator is sent to the equipment of the user 17 through the steam output pipeline, the low-temperature water of the user enters the water tank 15, and the liquid water in the water tank 15 enters the steam generator through the water input pipeline.

In order to cooperate with the transmission of molten salt, a second temperature sensor 4, a third valve V1, a high temperature molten salt pump 5, an electric regulating valve V2, a filter 6, a flow meter 7 and a Four-valve V3. A fifth valve V5, a low-temperature molten salt pump 9 and a sixth valve V4 are sequentially arranged on the cold medium transmission pipeline from the molten salt energy storage and heat release system to the steam heating system side.

In order to cooperate with the transmission of water vapor, a first valve V6, a first temperature sensor 10, a pressure sensor 11, a pressure gauge 12, a safety valve 13 and The first shut-off valve HV1. A second valve V7, a water pump 16 and a second shut-off valve HV2 are sequentially arranged on the steam-water input pipeline from the steam heating system to the water tank 15 side.

The water tank 15 is provided with a water replenishing port 22 , an exhaust port 23 and a sewage outlet 24 . The water box includes a steam box 19 and a liquid box 20. The liquid box 20 is covered outside the steam box 19. The top of the steam box 19 is provided with a spiral steam pipe 21, and the steam pipe 21 is arranged in the liquid. Inside the box 20, the steam pipe 21 is used to increase the contact area between the water vapor and the liquid water. The inner cavity of the steam box 20 is communicated with the inner cavity of the steam pipe 21. The low-temperature water vapor in the user equipment enters the steam box and is converted into liquid from gas. The bottom of the steam box 19 is communicated with the liquid box 20 through a one-way valve. , the liquid is discharged into the liquid chamber through the one-way valve, and the liquid in the liquid tank enters the steam generator for generating water vapor. The exhaust port is communicated with the steam tank, and the sewage discharge port and the water replenishment port are communicated with the liquid tank.

The above is only the preferred embodiment of the present invention, it should be pointed out that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made, and these improvements and modifications are also It should be regarded as the protection scope of the present invention.

Claims (9)

1. A fused salt heat storage based power grid peak regulation system is characterized in that: the system comprises a fused salt energy storage and heat release system and a steam heat supply system; a cold medium transmission pipeline and a hot medium transmission pipeline are communicated between the molten salt energy storage and heat release system and the steam heat supply system, and the molten salt energy storage and heat release system and the steam heat supply system form medium circulation through the cold medium transmission pipeline and the hot medium transmission pipeline; the heating element (2) of the molten salt energy storage and heat release system is electrically connected with the power generation device (18), and the steam heating system provides high-temperature steam for a user (17).

2. The molten salt heat storage based power grid peak shaving system according to claim 1, wherein the system is used for peak shavingIs characterized in that: the molten salt is 53% KNO₃-7％NaNO₃-40％NaNO₂Ternary molten salt.

3. The molten salt heat storage based power grid peak regulation system according to claim 1, wherein: the steam heating system is communicated with user (17) equipment through a steam output pipeline and a water input pipeline, a water tank (15) is communicated between the water input pipelines, and a drain valve (14) is arranged between the water tank (15) and the user (17) equipment.

4. The molten salt heat storage based power grid peak regulation system according to claim 3, wherein: a first valve (V6), a first temperature sensor (10), a pressure sensor (11), a pressure gauge (12), a safety valve (13) and a first cut-off valve (HV1) are sequentially arranged on the steam output pipeline from the side of the steam heating system to the side of a user (17).

5. The molten salt heat storage based power grid peak regulation system according to claim 3, wherein: and a second valve (V7), a water pump (16) and a second stop valve (HV2) are sequentially arranged on the steam water input pipeline from the steam heating system to one side of the water tank (15).

6. The molten salt heat storage based power grid peak regulation system according to claim 3, wherein: the water tank (15) is provided with a water replenishing opening (22), an exhaust opening (23) and a sewage draining opening (24).

7. The molten salt heat storage based power grid peak regulation system according to claim 6, wherein: the water tank comprises a steam tank (19) and a liquid tank (20), the liquid tank (20) is covered outside the steam tank (19), a spiral steam pipe (21) is arranged at the top of the steam tank (19), the steam pipe (21) is arranged in the liquid tank (20), and the inner cavity of the steam tank (20) is communicated with the inner cavity of the steam pipe (21); the bottom of the steam box (19) is communicated with the liquid box (20) through a one-way valve, the exhaust port is communicated with the steam box, and the drain outlet and the water replenishing port are communicated with the liquid box.

8. The molten salt heat storage based power grid peak regulation system according to claim 1, wherein: the heat medium transmission pipeline is sequentially provided with a second temperature sensor (4), a third valve (V1), a high-temperature molten salt pump (5), an electric adjusting valve (V2), a filter (6), a flowmeter (7) and a fourth valve (V3) from the molten salt energy storage and heat release system to the steam heat supply system side; and a fifth valve (V5), a low-temperature molten salt pump (9) and a sixth valve (V4) are sequentially arranged on the cold medium transmission pipeline from the molten salt energy storage and heat release system to the steam heat supply system side.

9. The molten salt heat storage based power grid peak regulation system according to claim 1, wherein: the molten salt energy storage and heat release system comprises a molten salt heat storage tank (1), the heating element (2) is an electric heating rod, and the electric heating rod is arranged in the molten salt heat storage tank (1); and a safety valve (3) is arranged on the molten salt heat storage tank.

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