Saturated steam generating device

Abstract

The invention discloses a saturated steam generating device which comprises a heat preservation box, a heat exchange device and a water bath device, a heating device is arranged in the heat preservation box, the heat preservation box is filled with an energy storage medium, and the heat exchange device comprises a plurality of sets of heat exchange pipes arranged in the heat preservation box in parallel. The water bath device comprises an inner cavity for water vapor separation, the bottom of the inner cavity is connected with a water inlet pipe and a steam input pipe, the steam input pipe is connected with the outlet of the last heat exchange pipe, a steam output pipe is arranged at the top of the inner cavity, and the steam output pipe is connected with the water inlet pipe. A valve assembly is arranged on the steam output pipe, the inner cavity is further connected with a water outlet pipe, the water outlet pipe is connected with inlets of the first set of heat exchange pipes, and liquid conveying mechanisms are arranged on the water inlet pipe and the water outlet pipe respectively. According to the scheme, through the closed-loop connection design of the water bath device and the heat exchanger, the synergistic effect of steam-water separation and secondary steam generation is achieved, the steam production efficiency is improved, and saturated steam is effectively produced.

Description

Technical Field

[0001] This invention relates to the field of steam generators, and more particularly to a saturated steam generating device. Background Art

[0002] Traditional steam generators typically use electric heating or direct combustion of fossil fuels to provide heat, resulting in low energy efficiency, high carbon emissions, and high operating costs. In particular, addressing the mismatch between generated and available electrical energy at different times, existing technologies utilize energy storage products (such as molten salt) to convert excess electrical energy into heat energy and release it for consumer use during periods of low electricity demand. For example, the invention patent CN219656036U discloses a steam generator using a direct-flow system. The heat exchanger is directly connected to an external pump, and a heating device heats the heat storage medium. The heat storage medium stores energy and heats the heat exchanger, fulfilling the need to evaporate liquid into steam when needed. This eliminates the need for electricity during operation, ensuring steam generation while achieving energy savings.

[0003] However, in practical applications, the temperature fluctuations of the heat storage medium such as molten salt can easily lead to drastic changes in steam parameters (pressure and temperature). The above-mentioned equipment is not equipped with pressure and temperature control devices, and the water circulation of the direct-flow system relies entirely on external pumps. Once the pump fails or the control fails, it is very easy to cause the pipeline to be full of water or dry-burn, local overheating, or even bursting. In addition, the system pressure is directly affected by the heat exchanger's operating conditions, making overpressure protection difficult. Furthermore, the above-mentioned system is difficult to achieve dynamic adjustment. When the heat source input is interrupted or the load changes abruptly, the steam output will rapidly decrease or fluctuate. In the case of overheating, superheated steam is usually produced. In practical applications, saturated steam has a stable temperature, and saturated steam releases a large amount of latent heat when condensing, making its heat transfer efficiency better than that of superheated steam.

[0004] In addition, existing technologies for molten salt thermal storage typically employ dual-tank thermal storage, which requires a large space and complex piping connections between the two tanks, resulting in high equipment maintenance costs. Summary of the Invention

[0005] Therefore, in order to solve the above problems, the present invention provides a saturated steam generator.

[0006] This invention is achieved through the following technical solution: A saturated steam generator includes an insulated box, a heating device installed inside the insulated box, and an energy storage medium filled inside the insulated box. It also includes: A heat exchange device includes multiple sets of heat exchange tubes arranged in parallel within the insulation box. Each set of heat exchange tubes is provided with a transfer assembly at its inlet and outlet. The transfer assembly includes a transfer cover and a flow-limiting cover disposed inside the transfer cover, and a flow-collecting cavity is formed between the flow-limiting cover and the transfer cover. The inlet and outlet of each set of heat exchange tubes are disposed in two flow-collecting cavities. The outlet of the previous set of heat exchange tubes is connected to the inlet of the next set of heat exchange tubes through a parallel pipe. The parallel pipe is connected to the transfer cover and communicates with the flow-collecting cavity. A water bath device includes a water-vapor separation inner cavity. The bottom of the inner cavity is connected to a water inlet pipe and a steam input pipe, respectively. The steam input pipe is connected to the outlet of the last set of heat exchange tubes. A steam output pipe is provided at the top of the inner cavity. A valve assembly is provided on the steam output pipe. The inner cavity is also connected to a water outlet pipe, which is located between the water inlet pipe and the steam output pipe. The water outlet pipe is connected to the inlet of the first set of heat exchange tubes. Liquid delivery mechanisms are provided on the water inlet pipe and the water outlet pipe, respectively.

[0007] Preferably, the adapter assembly includes a first flange disposed on the top of the insulation box, the flow-limiting cover being fixed on the first flange, a second flange being disposed on the top of the first flange, the second flange having an mounting hole for assembling the adapter cover, the adapter cover being fixed in the mounting hole, and the first flange also having a plurality of through holes for connecting the heat exchange tube, the through holes being located between the flow-limiting cover and the mounting holes.

[0008] Preferably, each group of heat exchange tubes includes multiple U-shaped heat exchange tubes, each U-shaped heat exchange tube includes an inlet end and an outlet end, the inlet ends of the multiple U-shaped heat exchange tubes are inserted into the through holes on one of the first flanges, and the outlet ends of the multiple U-shaped heat exchange tubes are inserted into the through holes on another first flange.

[0009] Preferably, the device also includes a liquid level detection device and a pressure detection device disposed on the water bath device.

[0010] Preferably, the device also includes a temperature detection device mounted on the water bath.

[0011] Preferably, the valve body assembly includes a safety valve and a pressure reducing valve disposed on the steam output pipe, the pressure reducing valve being located at the outlet of the steam output pipe.

[0012] Preferably, the heating device is disposed at the bottom of the insulation box, and both ends of the heating device are fixed on the inner walls of both sides of the insulation box, and one end of the heating device extends to the outside of the insulation box.

[0013] Preferably, the heating device is inserted into the insulation box from the top.

[0014] Preferably, the insulated box is also equipped with a temperature sensor.

[0015] Preferably, the infusion mechanism includes a first pump body disposed on the inlet pipe and a second pump body disposed on the outlet pipe.

[0016] The beneficial effects of the technical solution of this invention are mainly reflected in: 1. The water bath device is installed between the external pump body and the heat exchange device, as well as between the heat exchange device and the steam output pipe. Through the closed-loop connection design between the water bath device and the heat exchanger, the synergistic effect of steam-water separation and secondary steam generation is realized, thereby improving steam production efficiency and further achieving energy saving.

[0017] 2. Each heat exchange tube is equipped with a transfer assembly at both the inlet and outlet. By setting a flow-limiting cover inside the transfer cover, the internal volume is controlled, thereby further strictly limiting the heat exchange flow rate of the equipment and improving the accuracy of equipment control.

[0018] 3. Add a level gauge, pressure detection device, or temperature detection device to the water bath device to monitor the liquid level and pressure / temperature inside the water bath device in real time, and adjust the input / output flow of the first and second pumps based on the liquid level and pressure inside the device. Specifically, by sensing the liquid level inside the water bath device, the output of the first pump can be adjusted in real time, thereby ensuring the balance of the liquid level inside the device. The water bath device can also use the second pump to deliver water to the heat exchange device via frequency conversion, dynamically adjusting the water supply to avoid heat waves caused by excessive water delivery, thus achieving dynamic adjustment of the liquid level and pressure inside the water bath device and the pressure of the heat exchange device. Simultaneously, the water bath device's internal cavity contains both steam and water, maintaining a saturated state. By controlling the stability of the internal cavity pressure, the stability of the production steam temperature can be achieved.

[0019] 4. By monitoring the internal state of the water bath device in real time and combining it with the closed-loop feedback control of variable frequency water supply, the water level and pressure in the internal cavity are kept within the optimal range to prevent dry burning or overpressure accidents. At the same time, in conjunction with the valve assembly of the steam output pipe, the pressure control safety valve is opened and the pressure of the output steam is adjusted by using a pressure reducing valve to ensure the safety of the entire equipment operation.

[0020] 5. As a container for energy storage medium, the insulated box adopts single-tank heat storage, which saves space for the entire equipment. In addition, the heating device inside the insulated box can be installed in multiple positions, making the internal space arrangement of the insulated box more flexible. Attached Figure Description

[0021] Figure 1 This is a three-dimensional view of a saturated steam generator; Figure 2 This is a side view of a saturated steam generator; Figure 3 This is a top view of a saturated steam generator; Figure 4 yes Figure 3 A cross-sectional view along line D-D'; Figure 5 yes Figure 4 Enlarged view of section A; Figure 6 This is a schematic diagram of a saturated steam generator (in this case, the heating device is inserted into the insulation box from the top; one side of the insulation box is omitted in the diagram). Figure 7 This is a schematic diagram of the connection structure between parallel pipes and the transition assembly (at this time, the first flange and the second flange are separated). Figure 8 This is a schematic diagram of a heat exchange device. DETAILED DESCRIPTION

[0022] To make the objectives, advantages, and features of the present invention clearer and more detailed, the following non-limiting description of preferred embodiments will be illustrated and explained. These embodiments are merely typical examples of applying the technical solutions of the present invention; all technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present invention.

[0023] It should also be noted that in the description of the solution, the terms "center", "upper", "lower", "left", "right", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of description and simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0024] Furthermore, the terms "first" and "second" in this invention are used for descriptive purposes only and should not be construed as indicating or implying a ranking of importance, or implicitly specifying the number of technical features shown. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] This invention discloses a saturated steam generating device, such as... Figure 4 , Figure 6 As shown, it includes an insulated box 1. The specific structure of the insulated box 1 can refer to various forms in the existing structure, which will not be described in detail here. The insulated box 1 is equipped with a heating device 2 and is filled with an energy storage medium. The energy storage medium can be molten salt or other materials with excellent heat preservation and energy storage performance, and the energy storage medium can be preheated by industrial waste heat. The heating device 2 can be an electric heating device 2 or a solar energy device, etc., which will not be described in detail here.

[0026] like Figures 1-6 As shown, the saturated steam generator also includes a heat exchange device and a water bath device 3. The heat exchange device includes multiple sets of heat exchange tubes 4 arranged in parallel in the insulation box 1. Each set of heat exchange tubes 4 is provided with a transfer assembly at its inlet and outlet. The transfer assembly includes a transfer cover 5 and a flow-limiting cover 6 disposed inside the transfer cover 5, and a flow-collecting cavity 7 is formed between the flow-limiting cover 6 and the transfer cover 5. The inlet and outlet of each set of heat exchange tubes 4 are disposed in two flow-collecting cavities 7. Specifically, water or steam first enters the flow-collecting cavity 7 connected to the inlet of the heat exchange tube 4, and enters the heat exchange tube 4 through the inlet of the heat exchange tube 4 for heating, and then flows out to the flow-collecting cavity 7 connected to the outlet of the heat exchange tube 4. By setting the flow-limiting cover 6 inside the transfer cover 5, the internal volume of the transfer assembly is reduced, thereby controlling the flow rate of the entire heat exchange device.

[0027] Among them, such as Figure 1 , Figure 3 , Figures 6-8 As shown, the outlets and inlets of two adjacent sets of heat exchange tubes 4 are connected, thereby realizing the parallel connection of multiple sets of heat exchange tubes 4. In the multiple sets of heat exchange tubes 4, the outlet of the previous set of heat exchange tubes 4 and the inlet of the next set of heat exchange tubes 4 are connected through parallel pipes 12. The parallel pipes 12 are connected to the transition cover 5 and communicate with the manifold 7. Specifically, multiple parallel pipes 12 are provided between the heat exchange tubes 4. One end of each parallel pipe 12 is set on the transition cover 5 at the outlet of one set of heat exchange tubes 4, and the other end is set on the transition cover 5 at the inlet of the next set of heat exchange tubes 4, thereby realizing the connection between the two sets of heat exchange tubes 4. The multiple sets of heat exchange tubes 4 are connected sequentially through parallel pipes 12, so that water outputs steam after multiple heat exchanges in the multiple sets of heat exchange tubes 4.

[0028] In one embodiment, if Figure 5-Figure 8 As shown, the adapter assembly includes a first flange 9 disposed on the top of the insulation box 1, a flow-limiting cover 6 fixed on the first flange 9, and a second flange 10 disposed on the top of the first flange 9. The first flange 9 and the second flange 10 are fixedly connected. The second flange 10 is provided with a mounting hole 11 for assembling the adapter cover 5. The adapter cover 5 is fixed in the mounting hole 11. The flow-limiting cover 6 and the adapter cover 5 are preferably fixed by welding, but can also be fixed by other existing fixing methods, which will not be described in detail here.

[0029] like Figure 5 , Figure 7As shown, the first flange 9 is also provided with a plurality of through holes 8 for connecting the heat exchange tubes 4. The through holes 8 are located between the flow limiting cover 6 and the mounting hole 11. Each group of heat exchange tubes 4 includes multiple U-shaped heat exchange tubes 4. Each U-shaped heat exchange tube 4 includes an inlet end and an outlet end. The inlet ends of the multiple U-shaped heat exchange tubes 4 are inserted into the through holes 8 on one of the first flanges 9, and the outlet ends of the multiple U-shaped heat exchange tubes 4 are inserted into the through holes 8 on another first flange 9. The through holes 8 are arranged on the outer periphery of the flow limiting cover 6, and the arrangement of the through holes 8 can be varied. In a preferred embodiment, the through holes 8 are arranged at equal angles along the circumference of the flow limiting cover 6, and the multiple U-shaped heat exchange tubes 4 in each group of heat exchange tubes 4 are evenly staggered with the through holes 8.

[0030] The water bath device 3 can be a steam drum or a water bath, etc., including an inner cavity for water-vapor separation, where steam and water coexist, with water located at the bottom and steam at the top. Figures 1-3 As shown, the bottom of the inner cavity is connected to a water inlet pipe 13 and a steam input pipe 14. The steam input pipe 14 is connected to the outlet of the last set of heat exchange pipes 4, so that the steam output after heat exchange by the heat exchange device re-enters the inner cavity, further stabilizing the steam temperature and pressure, thereby enabling the inner cavity to continuously output saturated steam. In addition, since the steam after heat exchange enters the inner cavity, it will also change the temperature of the inner cavity and the water in the inner cavity, thus improving the heat exchange efficiency of the entire device.

[0031] like Figures 1-3 As shown, a steam output pipe 15 is provided at the top of the inner cavity, and a valve assembly is provided on the steam output pipe 15 to control the steam output. The inner cavity is also connected to a water outlet pipe 16, which is located between the water inlet pipe 13 and the steam output pipe 15. The water outlet pipe 16 is connected to the inlet of the first set of heat exchange pipes 4. The external water source needs to pass through the inner cavity before being input into the heat exchange device. On the one hand, the water bath device 3 is located between the external water source and the heat exchange device, which facilitates flexible adjustment of the water output and control of pressure and water temperature. On the other hand, when the external water source fails to output, the water in the water bath device 3 continues to output to the heat exchange device to avoid the heat exchange device from burning dry and causing safety problems. The water inlet pipe 13 and the water outlet pipe 16 are respectively provided with a liquid delivery mechanism. In one embodiment, the liquid delivery mechanism includes a first pump body 17 provided on the water inlet pipe 13 and a second pump body 18 provided on the water outlet pipe 16.

[0032] like Figure 1 , Figure 2As shown, in one embodiment, the water bath device 3 further includes a liquid level detection device 19 and a pressure detection device 20 disposed on the water bath device 3. The liquid level detection device 19 is a liquid level gauge for real-time monitoring of the water level in the inner cavity. When the liquid level gauge detects that the water level in the inner cavity is insufficient, the first pump body 17 supplies water to the inner cavity to bring the water level in the inner cavity to a preset position. When the liquid level gauge detects that the water level in the inner cavity is too high, the first pump body 17 reduces or stops supplying water and can also control the second pump body 18 to start, pumping the water in the inner cavity to the heat exchange device. The pressure detection device 20 is a pressure gauge that can monitor the pressure in the inner cavity in real time. When the pressure gauge detects that the pressure in the inner cavity is too high, it can output steam or pump water to the heat exchange device through the second pump body 18. In addition, the water bath device 3 can also supply water to the heat exchange device via the second pump body 18 using frequency conversion, thereby realizing the formation of saturated steam.

[0033] In a preferred embodiment, the water bath device 3 is further provided with a temperature detection device, such as a thermometer, and the temperature in the inner cavity is measured in real time by the thermometer. The inlet / outlet water flow rate of the inner cavity is adjusted in real time according to the temperature in the inner cavity. The specific adjustment method of the inner cavity temperature can be referred to the prior art, and will not be described in detail here.

[0034] like Figures 1-6 As shown, in one embodiment, the valve body assembly includes a safety valve 22 and a pressure reducing valve 23 disposed on the steam output pipe 15. When the pressure inside the steam output pipe 15 reaches a certain threshold, the safety valve 22 automatically opens. In addition, the pressure reducing valve 23 is located at the outlet of the steam output pipe 15. Since the pressure at the outlet is usually high, the pressure at the outlet can be reduced by the pressure reducing valve 23, and the saturated steam can be output stably.

[0035] like Figure 1 , Figure 4 As shown, in a real-time example, the heating device 2 is located at the bottom of the insulation box 1. The two ends of the heating device 2 are respectively fixed on the inner walls of the two sides of the insulation box 1, and one end of the heating device 2 extends to the outside of the insulation box 1. The part of the heating device 2 extending to the outside of the insulation box 1 can be connected to a heat source supply device, such as a power socket or a solar panel. The heating device 2 can be an existing heating device 2 such as an electric heating rod or a resistance heater, which will not be described in detail here.

[0036] like Figure 6As shown, in a real-time example, the heating device 2 is inserted into the insulation box 1 from the top. Since the heat exchange device also extends from the top of the insulation box 1 into the interior, this arrangement of the heating device 2 can fully heat the energy storage medium around the heat exchange device, reducing heat consumption. The part of the heating device 2 inserted into the insulation box 1 can also extend to the bottom of the insulation box 1, thereby ensuring that the temperature of each area of ​​the insulation box 1 is uniform. In addition, the number of heating devices 2 can be adjusted according to needs, which will not be elaborated here.

[0037] like Figures 1-6 As shown, the insulation box 1 is also equipped with a temperature sensor 21, which is used to sense the temperature inside the insulation box 1 in real time, and then adjust the heating temperature of the heating device 2 in real time according to the temperature data, so as to further ensure the safety and stability of the entire equipment operation and reduce energy consumption.

[0038] This invention has many other embodiments, and all technical solutions formed by equivalent transformations or equivalent transformations fall within the protection scope of this invention.

Claims

1. A saturated steam generator, comprising an insulated box, wherein a heating device is installed inside the insulated box, and the insulated box is filled with an energy storage medium, characterized in that: Also includes: A heat exchange device includes multiple sets of heat exchange tubes arranged in parallel within the insulation box. Each set of heat exchange tubes is provided with a transfer assembly at its inlet and outlet. The transfer assembly includes a transfer cover and a flow-limiting cover disposed inside the transfer cover, and a flow-collecting cavity is formed between the flow-limiting cover and the transfer cover. The inlet and outlet of each set of heat exchange tubes are disposed in two flow-collecting cavities. The outlet of the previous set of heat exchange tubes is connected to the inlet of the next set of heat exchange tubes through a parallel pipe. The parallel pipe is connected to the transfer cover and communicates with the flow-collecting cavity. A water bath device includes a water-vapor separation inner cavity. The bottom of the inner cavity is connected to a water inlet pipe and a steam input pipe, respectively. The steam input pipe is connected to the outlet of the last set of heat exchange tubes. A steam output pipe is provided at the top of the inner cavity. A valve assembly is provided on the steam output pipe. The inner cavity is also connected to a water outlet pipe, which is located between the water inlet pipe and the steam output pipe. The water outlet pipe is connected to the inlet of the first set of heat exchange tubes. Liquid delivery mechanisms are provided on the water inlet pipe and the water outlet pipe, respectively.

2. The saturated steam generator according to claim 1, characterized in that: The adapter assembly includes a first flange disposed on the top of the insulation box, a flow-limiting cover fixed on the first flange, a second flange disposed on the top of the first flange, a mounting hole for assembling the adapter cover disposed in the second flange, the adapter cover being fixed in the mounting hole, and a plurality of through holes for connecting the heat exchange tubes disposed on the first flange, the through holes being located between the flow-limiting cover and the mounting holes.

3. The saturated steam generator according to claim 2, characterized in that: Each heat exchange tube group includes multiple U-shaped heat exchange tubes, each U-shaped heat exchange tube has an inlet end and an outlet end. The inlet ends of the multiple U-shaped heat exchange tubes are inserted into the through holes on one of the first flanges, and the outlet ends of the multiple U-shaped heat exchange tubes are inserted into the through holes on another first flange.

4. The saturated steam generator according to claim 1, characterized in that: It also includes a liquid level detection device and a pressure detection device installed on the water bath device.

5. The saturated steam generator according to claim 4, characterized in that: It also includes a temperature detection device installed on the water bath device.

6. The saturated steam generator according to claim 1, characterized in that: The valve body assembly includes a safety valve and a pressure reducing valve disposed on the steam output pipe, the pressure reducing valve being located at the outlet of the steam output pipe.

7. The saturated steam generator according to claim 1, characterized in that: The heating device is located at the bottom of the insulation box, with both ends of the heating device fixed to the inner walls of both sides of the insulation box, and one end of the heating device extending to the outside of the insulation box.

8. The saturated steam generator according to claim 1, characterized in that: The heating device is inserted into the insulation box from the top.

9. The saturated steam generator according to claim 7 or 8, characterized in that: The insulated box is also equipped with a temperature sensor.

10. The saturated steam generator according to claim 1, characterized in that: The infusion mechanism includes a first pump body installed on the inlet pipe and a second pump body installed on the outlet pipe.

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