Valley electricity heat storage steam generator

Abstract

The invention relates to an off-peak electricity heat storage steam generator which comprises a heat storage tank body, a steam generator body and a waste heat tank body which are connected in sequence, the heat storage tank body is filled with a heat storage medium, and a heater is arranged on the heat storage tank body; the steam generator is divided into a medium filling cavity connected with the heat storage tank body and the waste heat tank body through the heat exchange layer and a steam generating cavity communicated with a water source, heat storage media in the heat storage tank body enter the medium filling cavity to heat the steam generating cavity, and the waste heat tank body is used for receiving the heat storage media with the temperature lower than the set temperature in the medium filling cavity. A flow control valve is arranged on a pipeline between the heat storage tank body and the medium filling cavity, the heat storage medium entering the medium filling cavity is controlled through the flow control valve, and then the steam output amount of the steam generation cavity is controlled; the steam generator has the advantages that danger is controlled within a controllable range by effectively controlling the contact area of the steam generator and the heat storage medium, and the steam generation amount can be controlled through the discharge amount of the heat storage medium.

Description

Technical Field

[0001] The invention relates to the technical field of clean energy, and in particular to a valley electricity thermal storage steam generator. Background Art

[0002] Steam generator is a mechanical device that uses the thermal energy of fuel or other energy to heat water into steam, and plays a very important role in production and life. With the rapid development of small and medium-sized enterprises, the demand for steam in society is increasing. At present, most traditional steam generation equipment uses coal, natural gas, biomass, electricity, etc., but coal and biomass have been gradually abandoned in the field of steam generation, and the price of natural gas is much higher than that of coal, resulting in high steam prices on the market.

[0003] Electricity is a clean energy source. Currently, electricity is used as an energy source to replace coal, natural gas, oil and other combustible raw materials. Although it does not cause air pollution, the cost of using electricity is too high. In particular, the peak-valley electricity prices and the flat-term electricity prices are several times the cost of coal. The cost of valley electricity is equal to the price of coal, resulting in the vigorous development of valley electricity thermal storage in the field of evaporation.

[0004] At present, most valley power thermal storage steam generators use electricity to heat molten salt and other thermal storage media during valley power periods to store thermal energy, which is then used in other periods. However, due to the extremely large temperature difference between molten salt and other thermal storage media and water, the maximum temperature difference exceeds 500 degrees Celsius. Such a large temperature difference makes it easy for traditional steam generators to have accidents when using valley power thermal storage media, just like exploding like a bomb. Summary of the invention

[0005] In view of the above problems, an object of the present invention is to provide a valley electricity thermal storage steam generator for effectively controlling the contact area between the heat storage medium and the steam generator, so as to overcome the above-mentioned deficiencies of the prior art.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] A valley electricity thermal storage steam generator comprises: a heat storage tank body, a steam generator and a waste heat tank body connected in sequence, the heat storage tank body is filled with a heat storage medium (molten salt), the heat storage tank body is provided with a heater (electric heating rod) for heating the heat storage medium, the steam generator is separated into a medium filling chamber connected to the heat storage tank body and the waste heat tank body, and a steam generating chamber connected to a water source (water storage tank) by a heat exchange layer, the heat storage medium in the heat storage tank body enters the medium filling chamber to heat the steam generating chamber, the waste heat tank body is used to receive the heat storage medium in the medium filling chamber that is lower than a set temperature, a flow control valve is provided on the pipeline between the heat storage tank body and the medium filling chamber, the heat storage medium entering the medium filling chamber is controlled by the flow control valve, and the steam output of the steam generating chamber is controlled.

[0008] As a preferred embodiment of the present invention, the waste heat tank body is provided with a circulation pipe connected to the heat storage tank body, and the circulation pipe is provided with a heat storage medium pump.

[0009] As a preferred embodiment of the present invention, the water source is a water storage tank, and the waste heat tank body heats the water storage tank through a waste heat exchanger to increase the basic water temperature entering the steam generating chamber.

[0010] As a preferred embodiment of the present invention, a breathing port and a pressure sensor are provided on the medium filling chamber, and a liquid level meter is installed on the steam generating chamber.

[0011] As a preferred embodiment of the present invention, the heat storage medium is molten salt.

[0012] As a preferred embodiment of the present invention, the heater is an electric heating rod, and the electric heating rod is powered by a valley power supply, or powered by a wind energy or water energy conversion device.

[0013] As a preferred embodiment of the present invention, the heat storage tank is connected to a plurality of steam generators via pipelines.

[0014] Another object of the present invention is to provide a valley electricity thermal storage steam generator, comprising: a thermal storage tank body and a steam generator, wherein the thermal storage tank body is filled with a thermal storage medium (molten salt), the thermal storage tank body is provided with a heater (electric heating rod) for heating the thermal storage medium, the steam generator is separated into a medium filling chamber connected to the thermal storage tank body and a steam generating chamber (steam boiler) connected to a water source (water storage tank) by a heat exchange layer, the thermal storage tank body and the medium filling chamber of the steam generator are connected by two pipelines to form a circulation loop, a flow control valve is provided on the pipeline, and the thermal storage medium entering the medium filling chamber is controlled by the flow control valve, thereby controlling the steam output of the steam generating chamber.

[0015] The advantages and positive effects of the present invention are:

[0016] 1. The present invention controls the danger within a controllable range by effectively controlling the contact area between the steam generator and the heat storage medium, and the amount of steam generated can also be controlled by the discharge amount of the heat storage medium.

[0017] 2. The present invention increases the waste heat tank to receive the heat storage medium whose temperature is lower than the set temperature, and the heat storage medium in the waste heat tank can also be used to preheat the water entering the steam generator, so as to effectively save energy.

[0018] 3. In the present invention, the heat storage medium that is lower than the set temperature can also be sent back to the heat storage tank through a circulation pump and reheated during the off-peak period. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of this embodiment 1.

[0020] Figure 2 It is a schematic diagram of the overall structure of this embodiment 2.

[0021] Reference numerals: heat storage tank 1 , steam generator 2 , waste heat tank 3 , heat storage medium pump 4 , heater 5 , water storage tank 6 , circulation pipe 7 . DETAILED DESCRIPTION

[0022] Example 1

[0023] See also Figure 1 The present embodiment provides a valley electricity thermal storage steam generator, comprising: a heat storage tank body 1, a steam generator 2 and a waste heat tank body 3 connected in sequence, the heat storage tank body 1 is filled with a heat storage medium, and the heat storage tank body 1 is provided with a heater 5 for heating the heat storage medium. The heat storage medium in the present embodiment is molten salt, and the steam generator 2 is separated into a medium filling chamber connected to the heat storage tank body 1 and the waste heat tank body 3, and a steam generating chamber connected to the water storage tank 6 through a heat exchange layer, and the heat storage medium in the heat storage tank body 1 enters the medium filling chamber to heat the steam generating chamber, and the waste heat tank body 3 is used to receive the heat storage medium in the medium filling chamber that is lower than the set temperature, and a flow control valve is provided on the pipeline between the heat storage tank body 1 and the medium filling chamber, and the heat storage medium entering the medium filling chamber is controlled by the flow control valve, thereby controlling the steam output of the steam generating chamber, wherein the flow control valve adopts a gate valve 9 and a ball valve 10 connected in sequence, and is fixed to the steam generator 2 through a flange 11, and similarly, the steam generator 2 and the waste heat tank body 3 are connected through the same flow control valve. The waste heat tank body 3 is provided with a circulation pipe 7 connected to the heat storage tank body 1 , and the circulation pipe 7 is provided with a heat storage medium pump 4 , through which the heat storage medium in the waste heat tank body 3 is transported to the heat storage tank body 1 .

[0024] In this embodiment, the waste heat tank 3 heats the water storage tank 6 through the waste heat exchanger, so that the basic water temperature entering the steam generating chamber is increased.

[0025] In this embodiment, a breathing port and a pressure sensor are provided on the medium filling chamber, and a liquid level meter is installed on the steam generating chamber.

[0026] In this embodiment, the heater 5 is an electric heating rod, which is powered by a valley power supply, or by a wind energy or water energy conversion device.

[0027] In this embodiment, the heat storage tank body 1 can be connected to a plurality of steam generators 2 through pipelines, thereby controlling the amount of steam generated.

[0028] In this embodiment, the steam generating chamber is cylindrical or rectangular, and the medium filling chamber wraps the steam generating chamber.

[0029] Working principle: The amount of steam generated in the steam generator 2 is controlled by the flow of molten salt. Since the steam generator 2 is divided into a steam generation chamber and a medium filling chamber, the amount of high-temperature molten salt stored in the heat storage tank 1 that enters the medium filling chamber is controlled by a flow control valve, and then the steam generation chamber is heated by the medium filling chamber with a controllable molten salt capacity. With this form of connection, the amount of molten salt in the medium filling chamber can support superheated steam without causing explosion danger. In addition, the temperature of the molten salt entering the waste heat tank 3 is also around 200 degrees, so the water in the water storage tank 6 can be heated to below the boiling point by the waste heat heat exchanger, thereby improving energy efficiency while reducing the temperature difference between the hot water and the molten salt after entering the steam generator 2, further improving safety.

[0030] Example 1

[0031] See also Figure 2 The present embodiment provides a valley electricity thermal storage steam generator, comprising: a thermal storage tank body 1 and a steam generator 2. The thermal storage tank body 1 is filled with a thermal storage medium. The thermal storage tank body 1 is provided with a heater (electric heating rod) 5 for heating the thermal storage medium. The steam generator 2 is separated into a medium filling chamber connected to the thermal storage tank body 1 and a steam generating chamber connected to a water source through a heat exchange layer. The thermal storage tank body 1 and the medium filling chamber of the steam generator 2 are connected through two pipelines to form a circulation loop. A flow control valve is provided on the pipeline. The flow control valve is used to control the thermal storage medium entering the medium filling chamber, thereby controlling the steam output of the steam generating chamber.

[0032] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A valley electricity thermal storage steam generator, characterized in that: include: A heat storage tank body, a steam generator and a waste heat tank body are connected in sequence, the heat storage tank body is filled with a heat storage medium, the heat storage tank body is provided with a heater for heating the heat storage medium, the steam generator is separated into a medium filling chamber connected to the heat storage tank body and the waste heat tank body, and a steam generating chamber connected to a water source through a heat exchange layer, the heat storage medium in the heat storage tank body enters the medium filling chamber to heat the steam generating chamber, the waste heat tank body is used to receive the heat storage medium in the medium filling chamber that is lower than a set temperature, a flow control valve is provided on the pipeline between the heat storage tank body and the medium filling chamber, the heat storage medium entering the medium filling chamber is controlled by the flow control valve, and then the steam output of the steam generating chamber is controlled.

2. The valley electricity thermal storage steam generator according to claim 1, characterized in that: The waste heat tank body is provided with a circulation pipe connected with the heat storage tank body, and the circulation pipe is provided with a heat storage medium pump.

3. The valley electricity thermal storage steam generator according to claim 1, characterized in that: The water source is a water storage tank, and the waste heat tank body heats the water storage tank through a waste heat heat exchanger to increase the basic water temperature entering the steam generating chamber.

4. The valley electricity thermal storage steam generator according to claim 1, characterized in that: A breathing port and a pressure sensor are provided on the medium filling cavity, and a liquid level meter is installed on the steam generating cavity.

5. The valley electricity thermal storage steam generator according to claim 1, characterized in that: The heat storage medium is molten salt.

6. The valley electricity thermal storage steam generator according to claim 1, characterized in that: The heater is an electric heating rod, which is powered by a valley power supply, or by a wind energy or water energy conversion device.

7. The valley electricity thermal storage steam generator according to claim 1, characterized in that: The heat storage tank is connected to a plurality of steam generators through pipelines.

8. A valley electricity thermal storage steam generator, characterized in that: include: A heat storage tank body and a steam generator, wherein the heat storage tank body is filled with a heat storage medium, and a heater for heating the heat storage medium is arranged on the heat storage tank body. The steam generator is separated into a medium filling chamber connected to the heat storage tank body and a steam generating chamber connected to a water source by a heat exchange layer. The heat storage tank body and the medium filling chamber of the steam generator are connected by two pipelines to form a circulation loop. A flow control valve is arranged on the pipeline, and the heat storage medium entering the medium filling chamber is controlled by the flow control valve, thereby controlling the steam output of the steam generating chamber.

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