A steam generator

Abstract

The present invention discloses a steam generator, which belongs to the field of heat storage, and includes: an energy storage tank, a heat exchange device, and a steam generating device; the steam generating device includes a first water inlet, a second water inlet, and a steam port. The beneficial effects of the present invention are: the lower heat exchange device and the upper steam generating device are innovatively designed, and the functions of multiple components such as the heat exchanger, steam generator, steam-water separator, desuperheater, and steam drum in the prior art are integrated into one, reducing the footprint of the system, shortening the overall pipeline connection length, reducing pipe joints, and reducing costs; at the same time, the lower heat exchange device is used for primary heat exchange, the upper steam generating device is used for secondary heating, and the steam-water separation process and the temperature reduction and pressurization process are realized through the jacket, so as to prevent the system from over-temperature and over-pressure, improve safety performance, and stabilize steam output; it is suitable for the field of small and medium-sized steam for heat storage, and is conducive to standardized production and large-scale promotion.

Description

Technical Field

[0001] The invention relates to the field of heat storage, and in particular to a steam generator. Background Art

[0002] Thermal storage technology can utilize cheap electricity at off-peak hours to store the required energy for use when needed, thus solving problems such as low load at night, increased peak-to-valley difference in the power grid, and difficulty in peak load regulation of units, thus avoiding huge economic losses and energy waste caused by supply and demand conflicts between power plants and users.

[0003] At present, the existing small steam generator (commonly known as boiler) usually uses electricity or gas, oil, etc. to directly heat cold water to increase the temperature of the water to generate steam, which is costly, requires waiting when starting, and does not have a heat storage function. Gas and oil will produce tail gas, which is not environmentally friendly; the existing molten salt heat storage system includes molten salt storage tanks, heat exchangers, steam drums, cooling devices, steam pipeline laying, control cabinets and other components, which have many parts, many connection interfaces, long system pipelines, long process laying, large footprint, need to configure a special site, low integration, complex system, large investment, suitable for medium and large-scale application fields, and not very friendly to small and medium-sized heat storage steam fields; due to secondary heat exchange and thermal efficiency cannot be fully utilized, and the entire circulation system must be heated at the same time, once the heating system stops and the pipeline valve temperature is lower than the molten salt solidification point, the molten salt liquid will solidify, causing the entire circulation system to be scrapped, resulting in huge losses, high requirements for equipment, pipelines, and materials, and there are safety hazards. Therefore, there is an urgent need for a steam generator that can control the water flow rate and temperature and ensure stable output power to meet the needs of actual use. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a steam generator.

[0005] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:

[0006] The present invention provides a steam generator, comprising:

[0007] An energy storage tank body, wherein a heat storage medium is stored in the energy storage tank body;

[0008] a heat exchange device, arranged close to the energy storage tank, one end of the heat exchange device being connected to a water inlet port, the water inlet port being used to provide water for steam generation;

[0009] a steam generating device, arranged closely to the energy storage tank, for providing a water vapor separation environment, comprising a first water inlet, a second water inlet and a steam outlet;

[0010] The steam port is connected to a steam generation port via a check valve;

[0011] The first water inlet is connected to the other end of the heat exchange device;

[0012] The second water inlet is connected to the water inlet port via a first valve;

[0013] A controller is electrically connected to the first valve and controls the opening and closing of the first valve according to an external first control instruction.

[0014] Preferably, the heat exchange device, the energy storage tank and the steam generating device are all made of heat transfer materials;

[0015] The steam generation water exchanges heat with the heat storage medium through the heat exchange device and the steam generation device.

[0016] Preferably, the steam generator comprises a second valve;

[0017] The second valve is disposed between the heat exchange device and the water inlet port and is electrically connected to the controller, and is used to control the opening and closing of the second valve according to an external second control instruction.

[0018] Preferably, the steam generator comprises a first temperature detector;

[0019] The first temperature detector is disposed in the energy storage tank and electrically connected to the controller, and is used to detect a first real-time temperature of the heat storage medium and transmit the temperature back to the controller.

[0020] Preferably, the energy storage tank further comprises a heating device for heating the heat storage medium;

[0021] The heating device is electrically connected to the controller, and the controller controls the heating device to turn on according to the first real-time temperature when the first real-time temperature is less than a first preset threshold.

[0022] Preferably, the steam generator comprises a second temperature detector;

[0023] The second temperature detector is disposed between the check valve and the steam generating port and is electrically connected to the controller, and is used to detect a second real-time temperature of the generated steam and transmit it back to the controller;

[0024] The controller controls the first valve to open according to the second real-time temperature when the second real-time temperature is greater than a second preset threshold.

[0025] Preferably, the steam generator comprises a pressure detector;

[0026] The pressure detector is disposed in the steam generating device and electrically connected to the controller, and is used to detect the internal pressure of the steam generating device and transmit it back to the controller;

[0027] The controller controls the first valve to open according to the internal pressure when the internal pressure is greater than a third preset threshold.

[0028] Preferably, the heat exchange device adopts a spiral heat exchanger, and / or a serpentine heat exchanger, and / or a rectangular heat exchanger.

[0029] Preferably, the heat storage medium is a molten salt solution.

[0030] The beneficial effects of the present invention are:

[0031] The present invention innovatively adopts the design of a lower heat exchange device and an upper steam generating device, and integrates the functions of multiple components such as a heat exchanger, a steam generator, a steam-water separator, a desuperheater and a steam drum in the prior art, eliminating the separate settings of the steam-water separator, the desuperheater, the steam drum, the heat exchanger, etc., reducing the footprint of the system, shortening the overall pipeline connection length, reducing the number of pipe joints, reducing the complexity, shortening the construction period, and thus reducing the overall investment cost; at the same time, through the primary heat exchange of the lower heat exchange device, the secondary heating of the upper steam generating device, and the realization of the steam-water separation process and the temperature reduction and pressurization process through the jacket, the system is prevented from overheating and overpressure, the safety performance of the system is improved, and the stability of the steam output parameters is relatively strong; and no special person is required to be on duty, it is suitable for small and medium-sized thermal storage steam fields, and is conducive to standardized production and large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a steam generator in the present invention. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0036] The present invention provides a steam generator, belonging to the field of heat storage, comprising:

[0037] An energy storage tank 1, wherein a heat storage medium is stored in the energy storage tank 1;

[0038] A heat exchange device 2 is arranged close to the energy storage tank 1, and one end of the heat exchange device 2 is connected to a water inlet port, and the water inlet port is used to provide water for steam generation;

[0039] A steam generating device 3 is arranged closely to the energy storage tank 1 and is used to provide a water vapor separation environment, including a first water inlet, a second water inlet and a steam outlet;

[0040] The steam port is connected to a steam generation port through a check valve 4;

[0041] The first water inlet is connected to the other end of the heat exchange device 2;

[0042] The second water inlet is connected to the water inlet port through a first valve 10 .

[0043] A controller 9 is electrically connected to the first valve 10 and controls the opening and closing of the first valve 10 according to an external first control instruction.

[0044] Specifically, the steam generator includes an energy storage tank body 1, a heat exchange device 2, and a steam generating device 3; the heat exchange device 2 is arranged at the upper part of the energy storage tank body 1, and its function is to make water exchange heat with the heat storage medium when flowing through the heat exchange device 2. It should be noted that the technical solution does not limit the heat exchange device 2 to be located inside or outside the energy storage tank body 1; the steam generating device 3 is implemented by a jacket, and the jacket is arranged at the upper part of the energy storage tank body 1. It should be noted that the setting of the steam generating device 3 is not limited to being located inside or outside the tank body. The technical solution innovatively adopts the structural design of the lower heat exchange device 2 and the upper steam generating device 3, eliminating the separate settings of the steam-water separator, the cooler, the steam drum, the heat exchanger, etc., with high integration and low cost.

[0045] The steam generating device 3 comprises a first water inlet, a second water inlet and a steam port, wherein the steam port is connected to a steam generating port via a check valve 4, wherein the check valve 4 is a one-way valve, which can effectively prevent steam from flowing back and avoid potential safety hazards; the first water inlet is connected to the other end of the heat exchange device 2, and water flows through the heat exchange device 2 to exchange heat with the heat storage medium in the energy storage tank body 1, and then enters the steam generating device 3 from the first water inlet, and through the steam-water separation effect of the steam generating device 3, the generated steam rises, and the water sinks to the bottom of the steam generating device 3, and then passes through the check valve 4 from the steam port and is provided to the user from the steam generating port.

[0046] Furthermore, the second water inlet is connected to the water inlet port through a first valve 10. The first valve 10 is arranged at the upper part of the steam generating device 3. Water generates steam through the first branch and is provided to the user. Before the steam is provided to the user, the second thermometer 5 measures the temperature of the steam. When it is monitored that the steam is overheated, the controller 9 starts the first valve 10. Water enters the upper part of the steam generating device 3 through the pump 11 and the first valve 10 in sequence, and is sprayed into the steam generating device 3 from top to bottom, and heat is exchanged with the rising steam to reduce the steam temperature to the required preset temperature and supply it to the user, thereby realizing the process of cooling and reducing pressure, preventing the device from over-temperature and over-pressure, improving the safety performance of the system, and making the steam output more stable.

[0047] Furthermore, the steam generating device 3 is equivalent to having the function of an evaporator. The high-temperature molten salt in the energy storage tank 1 emits heat, which can heat and sink to the bottom of the steam generating device 3, so that the retained water continues to exchange heat and is converted into steam, which rises and is then provided to the user from the steam port, thus realizing the secondary heat exchange process of the steam generating device 3.

[0048] As a preferred embodiment, in the steam generator, the heat exchange device 2, the energy storage tank 1 and the steam generating device 3 are all made of heat transfer materials;

[0049] The steam generation water exchanges heat with the heat storage medium through the heat exchange device 2 and the steam generation device 3 .

[0050] As a preferred embodiment, the steam generator, wherein the steam generator comprises a second valve 12;

[0051] The second valve 12 is disposed between the heat exchange device 2 and the water inlet port.

[0052] As a preferred embodiment, in the steam generator, the first valve 10 and the second valve are both electromagnetic valves.

[0053] As a preferred embodiment, the steam generator, wherein the steam generator comprises a first temperature measuring device 7;

[0054] The first temperature detector 7 is disposed in the energy storage tank 1 and is electrically connected to the controller 9 , and is used to detect the first real-time temperature of the heat storage medium and transmit it back to the controller 9 .

[0055] As a preferred embodiment, the steam generator, wherein the steam generator comprises a second temperature measuring device 5;

[0056] The second temperature detector 5 is disposed between the check valve 4 and the steam generation port and is electrically connected to the controller 9, and is used to detect the second real-time temperature of the generated steam and transmit it back to the controller 9;

[0057] The controller 9 controls the first valve 10 to open according to the second real-time temperature when the second real-time temperature is greater than a second preset threshold.

[0058] As a preferred embodiment, the steam generator, wherein the steam generator comprises a pressure detector 8;

[0059] The pressure detector is disposed in the steam generating device 3 and is electrically connected to the controller 9, and is used to detect the internal pressure of the steam generating device and transmit it back to the controller 9;

[0060] The controller 9 controls the first valve 10 to open according to the internal pressure when the internal pressure is greater than a third preset threshold.

[0061] Specifically, the pressure detector 8 is used to measure the pressure of the steam in the steam generating device 3 and feed it back to the controller 9. When the pressure is monitored to be too high, the controller 9 opens the first valve 10 to spray into the steam generating device 3 to reduce the temperature and pressure.

[0062] As a preferred embodiment, the steam generator, wherein the energy storage tank 1 further comprises a heating device 6 for heating the heat storage medium;

[0063] The heating device 6 is electrically connected to the controller 9. The controller 9 controls the heating device 6 to turn on according to the first real-time temperature when the first real-time temperature is less than a first preset threshold.

[0064] Specifically, the heating device 6 includes at least one electric heater, one end of which is inserted into the heat storage medium from the upper part of the molten salt tank.

[0065] Furthermore, during the off-peak period, the controller 9 turns on the heating device 6 to heat the molten salt and stores the energy in the molten salt solution; when energy is needed, especially during peak power consumption, the controller 9 starts the second valve 12 to control the water to enter the steam generator from the water inlet port, and then exchanges heat with the heat storage medium through the heat exchange device 2, and then enters the steam generating device 3. Through the steam-water separation effect of the steam generating device 3, the generated steam rises, and the water sinks to the bottom of the steam generating device 3, and then is provided to the user from the steam outlet, and the heat is taken out when entering the heat exchange device 2. Compared with the electric direct heating system, the cost is greatly reduced.

[0066] As a preferred embodiment, in the steam generator, the heat exchange device 2 adopts a spiral heat exchanger, and / or a serpentine heat exchanger, and / or a rectangular heat exchanger.

[0067] As a preferred embodiment, in the molten salt heat storage steam generator, the heat exchange device 2 adopts a spiral heat exchanger, and / or a serpentine heat exchanger, and / or a rectangular heat exchanger, and / or other rotary structure heat exchangers.

[0068] Specifically, the heat exchange device 2 adopts a rotary structure design, which increases the contact area between the heat exchange device 2 and the heat storage medium and improves the heat exchange efficiency.

[0069] As a preferred embodiment, the heat storage medium of the steam generator is a molten salt solution.

[0070] As a preferred embodiment, the molten salt heat storage steam generator is provided with a pump 11 at the water inlet port, the pump 11 is connected to the first valve 10 and the second valve, and the pump 11 is used to transport water.

[0071] Further, the water inlet port, the pump 11, the second valve 12, the heat exchange device 2, the first water inlet, the steam generating device 3 and the steam port, and the steam generating port form a first branch;

[0072] The water inlet port, the pump 11, the first valve 10, the second water inlet port, the steam generating device 3 and the steam port, and the steam generating port form a second branch.

[0073] The beneficial effects of the present invention are:

[0074] The present invention innovatively adopts the design of a lower heat exchange device and an upper steam generating device, and integrates the functions of multiple components such as a heat exchanger, a steam generator, a steam-water separator, a desuperheater and a steam drum in the prior art, eliminating the separate settings of the steam-water separator, the desuperheater, the steam drum, the heat exchanger, etc., reducing the footprint of the system, shortening the overall pipeline connection length, reducing the number of pipe joints, reducing the complexity, shortening the construction period, and thus reducing the overall investment cost; at the same time, through the primary heat exchange of the lower heat exchange device, the secondary heating of the upper steam generating device, and the realization of the steam-water separation process and the temperature reduction and pressurization process through the jacket, the system is prevented from overheating and overpressure, the safety performance of the system is improved, and the stability of the steam output parameters is relatively strong; and no special person is required to be on duty, it is suitable for small and medium-sized thermal storage steam fields, and is conducive to standardized production and large-scale promotion.

[0075] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A steam generator, characterized in that: include: An energy storage tank body, wherein a heat storage medium is stored in the energy storage tank body; a heat exchange device, arranged close to the energy storage tank, one end of the heat exchange device being connected to a water inlet port, the water inlet port being used to provide water for steam generation; a steam generating device, arranged closely to the energy storage tank body, for providing a water vapor separation environment, comprising a first water inlet, a second water inlet and a steam port, wherein the steam generating device adopts a jacket to realize the steam-water separation process; The steam port is connected to a steam generation port via a check valve; The first water inlet is connected to the other end of the heat exchange device; The second water inlet is connected to the water inlet port via a first valve; a controller, electrically connected to the first valve, and controlling the opening and closing of the first valve according to an external first control instruction; The steam generator includes a second temperature measuring device; The second temperature detector is disposed between the check valve and the steam generating port and is electrically connected to the controller, and is used to detect a second real-time temperature of the generated steam and transmit it back to the controller; The controller controls the first valve to open according to the second real-time temperature when the second real-time temperature is greater than a second preset threshold.

2. The steam generator according to claim 1, characterized in that: The heat exchange device, the energy storage tank and the steam generating device are all made of heat transfer materials; The steam generation water exchanges heat with the heat storage medium through the heat exchange device and the steam generation device.

3. The steam generator according to claim 1, characterized in that: The steam generator includes a second valve; The second valve is disposed between the heat exchange device and the water inlet port and is electrically connected to the controller, and is used to control the opening and closing of the second valve according to an external second control instruction.

4. The steam generator according to claim 1, characterized in that: The steam generator includes a first temperature detector; The first temperature detector is disposed in the energy storage tank and electrically connected to the controller, and is used to detect a first real-time temperature of the heat storage medium and transmit the temperature back to the controller.

5. The steam generator according to claim 4, characterized in that: The energy storage tank also includes a heating device for heating the heat storage medium; The heating device is electrically connected to the controller, and the controller controls the heating device to turn on according to the first real-time temperature when the first real-time temperature is less than a first preset threshold.

6. The steam generator according to claim 1, characterized in that: The steam generator includes a pressure detector; The pressure detector is disposed in the steam generating device and electrically connected to the controller, and is used to detect the internal pressure of the steam generating device and transmit it back to the controller; The controller controls the first valve to open according to the internal pressure when the internal pressure is greater than a third preset threshold.

7. The steam generator according to claim 1, characterized in that: The heat exchange device adopts a spiral heat exchanger, and / or a serpentine heat exchanger, and / or a rectangular heat exchanger.

8. The steam generator according to claim 1, characterized in that: The heat storage medium is a molten salt solution.

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