Normal-pressure off-peak electricity heat storage steam generator

Abstract

The invention relates to a normal-pressure off-peak electricity heat storage steam generator which comprises a tank container and a heat storage medium filled in the tank container. The heater is arranged on the tank container and used for heating the heat storage medium, the steam generator is arranged in the tank container, and the elevator is used for adjusting the relative position of the tank container and the steam generator. The steam generator is used for generating normal-pressure steam, and an opening for discharging steam and an inlet for being connected with a water inlet pipe are formed in the steam generator; the lifter is used for driving the steam generator to adjust the contact area between the steam generator and the heat storage medium in the tank container, or the lifter is used for driving the tank container to adjust the contact area between the heat storage medium and the steam generator in the tank container; the steam generator has the advantages that the steam generator outputs steam in the mode that the upper end of the steam generator is open, and therefore it is guaranteed that the steam generator cannot explode when the tank container breaks down.

Description

Technical Field

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

[0002] Steam is also called "water vapor". According to pressure and temperature, various types of steam are classified into: saturated steam and superheated steam. During the transmission and use process, saturated steam contains some wet steam with water molecules that have not been completely evaporated, resulting in its effect not being comparable to that of superheated steam produced under high pressure.

[0003] Steam generator is a mechanical device that uses the thermal energy of fuel or other energy to heat water into steam, which 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. However, as my country pays more attention to the environment, 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.

[0004] 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.

[0005] 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

[0006] In view of the above problems, the purpose of the present invention is to provide a normal pressure valley electricity thermal storage steam generator, which is used for the steam generator to generate steam at room temperature, so that even if an accident occurs, there is no risk of explosion, so as to overcome the shortcomings of the above-mentioned prior art.

[0007] To achieve the above object, the present invention adopts the following technical solution:

[0008] A normal-pressure valley electricity thermal storage steam generator, characterized in that it comprises: a tank container, a heat storage medium filled in the tank container, a heater arranged on the tank container for heating the heat storage medium, a steam generator (steam boiler) arranged in the tank container, and a lift for adjusting the relative position of the tank container and the steam generator; the steam generator is used to generate normal-pressure water vapor, and the steam generator is provided with an opening for discharging steam and an inlet for connecting a water inlet pipe; the lift is used to drive the steam generator to adjust the contact area between the steam generator and the heat storage medium in the tank container, or the lift is used to drive the tank container to adjust the contact area between the heat storage medium and the steam generator in the tank container.

[0009] As a preferred embodiment of the present invention, the outer wall of the tank container is composed of a tank wall, a heat exchange tube layer, and a thermal insulation layer from the inside to the outside, and the heat exchange tube layer is used to convert normal pressure water vapor into superheated steam.

[0010] As a preferred embodiment of the present invention, the heat exchange tube layer is a coil heat exchanger, which is connected to the open port of the steam generator. The heat exchange tube layer absorbs the waste heat of the outer wall of the tank container and is used to convert the normal pressure water vapor passing through the tube into superheated steam.

[0011] As a preferred embodiment of the present invention, the heat exchange tube layer is a coil or a riser, and a heat-conducting medium is filled between the tank wall and the insulation layer. The heat-conducting medium (water, oil, etc.) is used to transfer the waste heat diffused outward from the inside of the tank container to the coil or the riser.

[0012] As a preferred embodiment of the present invention, a heat exchange tube layer is provided inside the tank container, one end of the heat exchange tube layer is connected to the open port of the steam generator, and the other end extends from the tank container. Normal-pressure water vapor entering the heat exchange tube layer from the open port becomes superheated steam after being heated in the tank container and is discharged from the other end of the heat exchange tube layer. Water will explode if it directly enters the steam generator with a high temperature of 600 degrees, but water vapor is not easy to explode when it enters the tank container with a high temperature of 600 degrees.

[0013] As a preferred embodiment of the present invention, the elevator driving the steam generator includes: a power source, and a connecting part connected to the power source and extending into the tank container, and the power source drives the steam generator through the connecting part to adjust the contact area between the steam generator and the heat storage medium in the tank container.

[0014] As a preferred embodiment of the present invention, the elevator for driving the tank container includes: a power source supported on a foundation and connected to the tank container, and a generator fixing frame that supports the steam generator to be stationary. The power source drives the tank container to rise or fall, so that the contact area between the heat storage medium inside the tank container and the steam generator changes.

[0015] As a preferred embodiment of the present invention, a breathing port and a pressure sensor are provided on the tank container, a liquid level meter is installed on the steam generator, and the lift is a hydraulic lift.

[0016] As a preferred embodiment of the present invention, the heat storage medium is molten salt.

[0017] 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.

[0018] The advantages and positive effects of the present invention are:

[0019] 1. The steam generator of the present invention discharges steam in the form of an open top, so that an explosion will not occur when a tank container fails.

[0020] 2. The steam generator of the present invention is installed in a tank container in a lifting form. By adjusting the contact area between the steam generator and the heat storage medium, the steam generation amount can be effectively controlled, and steam is generated according to demand, thereby solving the current problem of waste of molten salt heated during valley electricity hours in the field of steam generation.

[0021] 3. The normal-pressure valley electricity thermal storage steam generator of the present invention can directly utilize the electricity during valley electricity periods to produce steam. Compared with boiler equipment that requires the coordinated use of multiple devices, it is not only smaller in size but also simpler in structure.

[0022] 4. In the present invention, since steam is produced at normal pressure, although the explosion problem after a malfunction is solved, the steam contains wet steam. The present application adds a coil to the outer wall of the tank container. The coil uses the waste heat of the tank container to convert the normal-pressure steam passing through the coil into superheated steam. This method not only utilizes the waste heat, but also effectively solves the problem of wet steam containing some water molecules that have not been completely evaporated in the normal-pressure steam.

[0023] 5. The present invention also adopts a coil heat exchange structure added inside the tank container, so that the normal pressure steam can be quickly converted into superheated steam. Compared with directly producing superheated steam under high pressure, this method has similar steam output efficiency, and because the steam will not explode after entering the high temperature cavity compared with direct water injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is one of the overall structural diagrams in this embodiment 1.

[0025] Figure 2 This is the second overall structural diagram in the first embodiment.

[0026] Figure 3This is the third overall structural diagram in the first embodiment.

[0027] Figure 4 This is one of the overall structural diagrams in this embodiment 2.

[0028] Figure numerals: tank container 1, tank wall 101, heat exchange tube layer 102, heat storage medium 2, heater 3, steam generator 4, lift 5, hydraulic press 501, lift connecting rod 502, connecting pipe 6, breathing port 7, generator fixing frame 8. DETAILED DESCRIPTION

[0029] Example 1

[0030] See also Figure 1-3 The present embodiment provides a normal-pressure valley electricity thermal storage steam generator, comprising: a tank container 1, a heat storage medium 2 filled in the tank container 1, a heater 3 arranged on the tank container 1 for heating the heat storage medium 2, a steam generator 4 arranged in the tank container 1, and a lift 5 for adjusting the relative position of the tank container 1 and the steam generator 2; the steam generator 2 is used to generate normal-pressure water vapor, and the steam generator 2 is provided with an opening for discharging steam and an inlet (not shown) for connecting a water inlet pipe; the lift 5 is used to drive the steam generator 4 to adjust the contact area between the steam generator 4 and the heat storage medium 2 in the tank container 1, and the upper end of the tank container 1 is provided with an avoidance space for adjusting the position of the steam generator 4, and the lift 5 adopts a hydraulic lift or a chain lift or the like for a heavy object lifting structure. The lifter 5 in this embodiment includes: a hydraulic press 501 installed at the upper end of the tank container 1, and a lifting connecting rod 502 connected to the hydraulic press 501 and extending into the tank container 1. The hydraulic press 501 drives the steam generator 4 to adjust the contact area between the steam generator 4 and the heat storage medium 2 in the tank container 1 through the lifting connecting rod 502.

[0031] In this embodiment, the outer wall of the tank container 1 is composed of a tank wall 101, a heat exchange tube layer 102, and a heat insulation layer (not shown) from the inside to the outside. The heat exchange tube layer 102 is used to convert normal pressure steam into superheated steam. The heat exchange tube layer 102 is a coil heat exchanger, which is connected to the open end of the steam generator 4 through a connecting tube 6. The heat exchange tube layer 102 absorbs the waste heat of the outer wall of the tank container 1 and is used to convert the normal pressure steam passing through the tube into superheated steam.

[0032] In this embodiment, the heat exchange tube layer can also be replaced from coils to vertical tubes, and a heat-conducting medium that increases the heat-conducting efficiency is filled between the tank wall 101 and the insulation layer. The heat-conducting medium can be water, oil, etc.

[0033] In this embodiment, in order to increase the exhaust efficiency of superheated steam, the heat exchange tube layer 102 can be placed inside the tank container 1, and the connection port of the heat exchange tube layer for superheated steam extends from the side of the tank container 1. The normal-pressure water vapor entering the heat exchange tube layer 102 from the open port becomes superheated steam and is discharged after being heated in the tank container 1. Since water will explode if it directly enters the steam generator 4 with a high temperature of 600 degrees, water vapor is not easy to explode when it enters the tank container 4 with a high temperature of 600 degrees.

[0034] In this embodiment, a breathing port 7 and a pressure sensor (not shown) are provided on the tank container 1, and a liquid level meter (not shown) is installed on the steam generator 4. Since multiple blind pipes can be opened on the tank container 1 and the steam generator 4, data such as the temperature and pressure of water or steam can be installed through the blind pipes.

[0035] In this embodiment, the heat storage medium is molten salt, and 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.

[0036] Working principle: During the off-peak period, the tank container 1 is heated by the heater 3. The electricity price of heating the heat storage medium 2 (molten salt) to about 600 degrees during this period is not much different from the price of coal. The molten salt is used to store heat for use in other periods when steam is needed. Among them, the control of the steam generation amount uses the hydraulic press 501 to drive the steam generator 4 to adjust through the lifting connecting rod 502. The contact area between the steam generator 4 and the molten salt directly affects the steam generation amount. This method can accurately control the steam generation amount. In addition, the upper end of the steam generator 4 is open, so that only atmospheric pressure steam can be generated. By adding the heat exchange tube layer 102, the atmospheric pressure steam is converted into superheated steam to meet different needs.

[0037] Example 2

[0038] See also Figure 4 In this embodiment, the lift 5 uses four sets of hydraulic presses 501 supported on the foundation and connected to the tank container 1. The steam generator 4 is fixed in the tank container 1 through the generator fixing frame 8. The tank container 1 is adjusted to rise or fall through the hydraulic press 501, so that the contact area between the heat storage medium 2 inside the tank container 1 and the steam generator 4 changes.

[0039] 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 normal pressure valley electricity thermal storage steam generator, characterized in that: include: A tank container, a heat storage medium filled in the tank container, a heater arranged on the tank container for heating the heat storage medium, a steam generator arranged in the tank container, and a lift for adjusting the relative position of the tank container and the steam generator; the steam generator is used to generate normal pressure water vapor, and the steam generator is provided with an opening for discharging steam and an inlet for connecting a water inlet pipe; the lift is used to drive the steam generator to adjust the contact area between the steam generator and the heat storage medium in the tank container, or the lift is used to drive the tank container to adjust the contact area between the heat storage medium and the steam generator in the tank container.

2. The atmospheric pressure valley electricity thermal storage steam generator according to claim 1, characterized in that: The outer wall of the tank container is composed of a tank wall, a heat exchange tube layer, and a thermal insulation layer from the inside to the outside. The heat exchange tube layer is used to convert normal pressure water vapor into superheated steam.

3. The atmospheric pressure valley electricity thermal storage steam generator according to claim 2, characterized in that: The heat exchange tube layer is a coil heat exchanger, which is connected to the open port of the steam generator. The heat exchange tube layer absorbs the waste heat of the outer wall of the tank container and is used to convert the normal pressure water vapor passing through the tube into superheated steam.

4. The atmospheric pressure valley electricity thermal storage steam generator according to claim 2, characterized in that: The heat exchange tube layer is a coil or a riser, and a heat-conducting medium is filled between the tank wall and the insulation layer. The heat-conducting medium is used to transfer the waste heat diffused outward from the inside of the tank container to the coil or the riser.

5. The atmospheric pressure valley electricity thermal storage steam generator according to claim 1, characterized in that: A heat exchange tube layer is provided inside the tank container, one end of the heat exchange tube layer is connected to the open port of the steam generator, and the other end extends from the tank container. Normal-pressure water vapor entering the heat exchange tube layer from the open port becomes superheated steam after being heated in the tank container and is discharged from the other end of the heat exchange tube layer. Water will explode if it directly enters the steam generator with a high temperature of 600 degrees, but water vapor is not likely to explode when it enters the tank container with a high temperature of 600 degrees.

6. The atmospheric pressure valley electricity thermal storage steam generator according to claim 1, characterized in that: The elevator driving the steam generator includes: a power source, a connecting part connected to the power source and extending into the tank container, and the power source drives the steam generator through the connecting part to adjust the contact area between the steam generator and the heat storage medium in the tank container.

7. The atmospheric pressure valley electricity thermal storage steam generator according to claim 1, characterized in that: The elevator driving the tank container includes: a power source supported on a foundation and connected to the tank container, and a generator fixing frame supporting the steam generator to be stationary. The power source drives the tank container to rise or fall, so that the contact area between the heat storage medium inside the tank container and the steam generator changes.

8. The atmospheric pressure valley electricity thermal storage steam generator according to claim 1, characterized in that: The tank container is provided with a breathing port and a pressure sensor, the steam generator is provided with a liquid level meter, and the lift is a hydraulic lift.

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

10. The atmospheric pressure 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.

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