Inflatable plate type high-temperature solid sensible heat storage steam generation system and method

Abstract

The application discloses an inflation plate type high-temperature solid sensible heat storage steam generation system and method. The system comprises a solid heat storage module, a heat storage and release transition layer, an inflation plate type steam generator, a heating rod, a steam-water separator and the like. The application also discloses a heating method based on the inflation plate type steam generation system. The application adopts two heat storage and release transition layers to wrap the inflation plate type heat exchanger, the transition layer is in close contact with the solid heat storage layer, the heat transfer thermal resistance in the heat storage and release process is reduced, and the temperature distribution in the heat storage device is reasonably controlled. The implementation of the application can enhance the economy and applicability of the heat storage and release device in engineering application.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of blow plate high-temperature solid sensible heat heat storage steam generation system, belongs to sensible heat storage technology in the cross use of electric power peak shaving and heating field. BACKGROUND

[0002] Heat storage technology occupies a very important position in energy storage technology.

[0003] According to different heat storage mechanisms, heat storage technology can be divided into three heat storage modes: sensible heat storage, phase change heat storage and thermochemical heat storage.

[0004] Sensible heat storage is to store or release heat by increasing or decreasing the temperature of the heat storage material. As the most mature technology, sensible heat storage has wide applications in industrial waste heat utilization, power grid peak shaving, household heating, mobile heating and other fields due to its reliable stability and material economy.

[0005] Chinese patent CN115876021A discloses a solid heat storage heat supply system, the heat storage device is formed by splicing a plurality of block-shaped special-shaped heat storage materials, which can form vertical through holes for a plurality of heat absorption straight heat pipes and horizontal through holes for electric heating elements. The heat storage material structure used in this method is complex, the manufacturing cost is high, and the error in the installation process can easily cause the heat absorption straight heat pipes in the vertical through holes to be affected by stress, with the risk of deformation.

[0006] Chinese patent CN116293603A discloses a device and method for preparing high-quality superheated steam based on solid heat storage. The steam heat exchanger includes a horizontally arranged tank; another end of the tank is provided with a molten salt pump; the input end of the molten salt pump is provided with a molten salt extraction pipe; and the output end of the molten salt pump is connected with a molten salt circulation pipe. In this method, the distance between the high-temperature heat source and the low-temperature fluid is still far, and the problem of uneven heating between the heat exchange pipes has not been solved.

[0007] Current high-temperature solid sensible heat storage modules often arrange heating rods and heat receiving pipes alternately in heat storage solids for ease of design and installation. Although this method effectively arranges the high-temperature heat source and the low-temperature fluid, it often complicates the design and manufacturing process. In addition to increasing the processing cost, the pipes and heat-conducting solids often cannot be completely attached during operation and installation, which easily causes stress safety problems. In addition, the contact thermal resistance between the heat receiving pipes and the heat storage solids is often the main thermal resistance in the heat transfer process, which seriously hinders the heat transfer process.

[0008] In view of the problems of complex design structure, stress safety, and low heat energy utilization rate caused by contact thermal resistance of the current high-temperature solid sensible heat storage module, a high-temperature solid sensible heat storage device with simple and reliable structure, which can effectively reduce the thermal resistance between the high-temperature heat source and the low-temperature fluid and solve the safety problems caused by stress, is urgently needed. SUMMARY

[0009] The purpose of the present application is to overcome the shortcomings of the prior art and provide a blown plate type high-temperature solid sensible heat storage steam generation system and method.

[0010] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0011] In a first aspect, the present application provides a blown plate type high-temperature solid sensible heat storage steam generation system, which comprises an inlet pipeline, an inlet flange pipe, an inlet header, an inlet branch connecting pipe, a branch valve, a high-temperature solid heat accumulator body, an outlet branch connecting pipe, an outlet header, an outlet flange pipe, an outlet pipeline, a steam-water separator, a steam pipeline, a backwater pipeline, an inlet pressure sensor, an inlet temperature sensor, an outlet temperature sensor, and an outlet pressure sensor.

[0012] The high-temperature solid heat accumulator body comprises a heat preservation layer, a body frame, a solid heat storage layer, a heating rod, a heat storage and release transition layer, a blown plate heat exchanger parallel branch, a temperature sensor, and a mounting hole. The body frame is wrapped with a heat preservation layer on the outside, and the solid heat storage layer and the heat storage and release transition layer are alternately arranged in the transverse direction inside. Each layer of the heat storage and release transition layer is arranged in the vertical direction and is flanked by the solid heat storage layer. Each layer of the heat storage and release transition layer is filled with a heat-conducting material with fluidity, and a blown plate heat exchanger parallel branch in full heat exchange contact with the heat-conducting material penetrates vertically through the inside. A plurality of horizontally arranged mounting holes are uniformly provided in each layer of the solid heat storage layer, and the heating rod is distributed in the solid heat storage layer through the mounting holes for heating the solid heat storage layer. The sensing end of the temperature sensor is located in the solid heat storage layer for measuring the temperature change of the solid heat storage layer.

[0013] The inlet pipeline and the inlet header tank are connected through an inlet flange pipe, all the blown plate heat exchangers are arranged in parallel branches between the inlet header tank and an outlet header tank, the inlet of each blown plate heat exchanger parallel branch is connected with the inlet header tank through an inlet branch connecting pipe with a branch valve, and the outlet of each blown plate heat exchanger parallel branch is connected with the outlet header tank through an outlet branch connecting pipe; the outlet header tank is connected with the inlet of a steam-water separator in sequence through an outlet flange pipe, an outlet pipeline and a steam pipeline; the steam side outlet of the steam-water separator is connected with a hot end, and the liquid side outlet of the steam-water separator is reconnected with the inlet pipeline through a backwater pipeline, so that the separated saturated water is sent into the high-temperature solid heat accumulator body together with the newly input water to continue heating; the inlet pressure sensor and the inlet temperature sensor are arranged on the inlet flange pipe, and the outlet temperature sensor and the outlet pressure sensor are arranged on the outlet flange pipe.

[0014] As a preferred embodiment of the first aspect, the solid heat storage layer is composed of a plurality of cuboid-shaped solid heat storage modules stacked together, and the material of the solid heat storage module is one or a combination of graphite, metal slag, magnesite brick and porous solid heat storage material containing phase change material; and a mounting hole for arranging a heating rod is horizontally arranged at the center of the non-splicing end face of each solid heat storage module.

[0015] As a preferred embodiment of the first aspect, the heat storage and release transition layer is a solid transition layer, which comprises an elastic upper cover plate and a filling material, and the filling material is a powdery heat-conducting material; the annular space between the blown plate heat exchanger parallel branch and the adjacent two layers of solid heat storage layers is filled with the filling material, and the boundary is in direct contact with the solid heat storage layer; the elastic upper cover plate is arranged at the top end of the annular space and is fixedly installed on the top plate of the body frame, and the elastic upper cover plate is provided with an elastic element for compacting the filling material between the two layers of solid heat storage layers.

[0016] Further, the powdery heat-conducting material is powdery graphite, powdery high-thermal-conductivity metal or a mixture of the two.

[0017] Further, the elastic upper cover plate comprises an upper fixed plate, a spring, a through hole and a lower pressing plate; the upper fixed plate and the lower pressing plate are arranged in parallel and are elastically connected by a plurality of springs; the top plate of the body frame is provided with a mounting groove matched with the upper fixed plate at the position of the solid transition layer, the upper fixed plate is fixed to the top plate of the body frame through the mounting groove, and the lower pressing plate is pressed onto the top surface of the filling material under the action of the spring in the compressed state; the upper fixed plate and the lower pressing plate are provided with a through hole, and the outlet branch connecting pipe passes through the through hole and is connected with the blown plate heat exchanger parallel branch.

[0018] As the preferred of the first aspect, the heat storage and release transition layer adopts a phase change transition layer, which comprises a filler material, a fin-type partition plate and an upper fixed plate; the phase change transition layer and the solid heat storage layers on both sides are welded and sealed by metal partition plates, and the metal partition plates are provided with heat storage layer fins and transition layer fins on both sides to form the fin-type partition plate, wherein the heat storage layer fins extend into the solid heat storage layer, and the transition layer fins extend into the phase change transition layer; the annular space between the parallel branch of the inflation plate heat exchanger and the fin-type partition plates on both sides is filled with the filler material, and the filler material is a phase change material with a thermal conductivity greater than 10 W / m2K; the upper fixed plate is arranged at the top of the annular space and is fixedly installed on the top plate of the body frame to seal the filler material in the annular space.

[0019] Further, the material type of the phase change material is one or more of liquid metal, composite phase change material and foam metal filled phase change material; the spacing of the heat storage layer fins is the thickness of a single layer of solid heat storage modules in the solid heat storage layer; and the transition layer fins are perforated plate structures with a spacing of 1 / 2-1 / 4 of the spacing of the heat storage layer fins.

[0020] As the preferred of the first aspect, the heating rods are symmetrically distributed in the solid heat storage layer with the parallel branch of the inflation plate heat exchanger as the center.

[0021] As the preferred of the first aspect, the inlet of the parallel branch of the inflation plate heat exchanger is on both sides of the bottom of the high-temperature solid heat storage body, and the outlet is in the center of the top of the high-temperature solid heat storage body, and the outlet pipe diameter is 1.5-3 times of the inlet pipe diameter.

[0022] The second aspect of the present application provides a steam generation control method using the inflation plate high-temperature solid sensible heat storage steam generation system according to any one of the first aspect, which comprises a heat storage mode and a steam generation mode.

[0023] When the power supply is excessive, the power needs to be stored in the form of heat energy, and the heat storage mode is executed; the control method of the heat storage mode is that the heating rods are powered on to heat the high-temperature solid heat storage body, the heating rods consume electric energy and convert it into heat energy, the heat energy is first conducted from the heating rods to the solid heat storage layer, and then the heat is conducted to the heat storage and release transition layer after the solid heat storage layer is heated, at this time, it is in the heat storage stage, the solid heat storage layer stores heat in the form of sensible heat, and the heat storage and release transition layer stores heat in the form of sensible heat or sensible heat and phase change; the temperature change is monitored by the heat storage body temperature sensor, and when the solid heat storage layer and the heat storage and release transition layer are heated to the preset temperature or when the power supply is no longer excessive, the heating rods are turned off, and the heating stage is stopped.

[0024] When steam is needed to be generated, steam generation mode is executed; the control method of the steam generation mode is that: water to be heated is introduced into an inlet header through an inlet pipeline, an inlet flange manifold in sequence, the water from the inlet header is introduced into each blow plate heat exchanger parallel branch in the high-temperature solid heat accumulator body through an inlet branch connecting pipe and a branch valve at the same time, and first exchanges heat with a heat storage and release transition layer, after the temperature of the heat storage and release transition layer is reduced, the heat required for heating water is indirectly provided by a heating rod and a solid heat storage layer through the heat storage and release transition layer; the water continuously absorbs heat in each blow plate heat exchanger parallel branch, after phase change, enters an outlet header through an outlet branch connecting pipe, sequentially passes through an outlet flange pipe and an outlet pipeline, and finally is introduced into a steam-water separator, the separated saturated water is introduced into the inlet header through a backwater pipeline again and then enters the high-temperature solid heat accumulator body to continue heat exchange; the separated steam is introduced into a steam pipe network through a steam pipeline to supply users.

[0025] Compared with the prior art, the main innovation and characteristics of the present application are:

[0026] (1) The traditional slotting method will produce a complex structure, and the solid heat storage layer and the pipeline are in rigid contact, which is easy to produce bending and stress concentration phenomenon in the assembly process, and in the heating process, the pipeline is easy to produce deformation under the influence of thermal stress, and serious safety accidents may occur. In the present application, for the high-temperature solid sensible heat storage module, a heat storage and release transition layer is added between the solid heat storage layer and the pipeline, and because the transition layer is filled with a heat transfer medium with strong flowability, the influence of stress and bending on the safety of the heated pipeline is reduced.

[0027] (2) In the high-temperature solid sensible heat storage module, two different heat storage and release transition layers are designed. For the solid heat storage and release transition layer, the structure is simple, can be directly contacted with the blow plate heat exchanger and the solid heat storage layer, and the elastic top cover plate ensures the density of the heat transfer medium in the solid heat storage and release transition layer; for the phase change heat storage and release transition layer, metal fins are used to increase the heat exchange area. The design of the two heat storage and release transition layers reduces the contact thermal resistance between the heated pipeline and the solid heat storage layer, and reduces the total thermal resistance in the heat transfer process from the high-temperature heat source to the low-temperature fluid. In addition, compared with the traditional pipe heat exchanger, the blow plate heat exchanger has a larger specific surface area, which also improves the heat exchange efficiency and energy utilization rate.

[0028] (3) The blow plate heat exchanger used in the present application has a large pressure bearing capacity, the internal pressure can be up to 8Mpa, the external pressure can be up to 30MPa, and the temperature can be up to 1800℃, which can produce steam of higher quality for users to use compared with ordinary round pipes. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a blow plate high-temperature solid sensible heat storage steam generation system structure schematic diagram;

[0030] Figure 2 It is an explosion view of the inflation plate type high-temperature solid heat accumulator body;

[0031] Figure 3 It is a structure view of the solid transition layer and the phase change transition layer;

[0032] Figure 4 It is a structure view of the upper cover plate of the solid transition layer.

[0033] In the figure, the reference signs are as follows: inlet pipeline 1, inlet flange pipe 2, inlet header 3, inlet branch connection pipe 4, branch valve 5, high-temperature solid heat accumulator body 6, outlet branch connection pipe 7, outlet header 8, outlet flange pipe 9, outlet pipeline 10, steam-water separator 11, steam pipeline 12, backwater pipeline 13, inlet pressure sensor 14, inlet temperature sensor 15, outlet temperature sensor 16, outlet pressure sensor 17, heat preservation layer 61, body frame 62, solid heat storage layer 63, heating rod 64, heat storage and release transition layer 65, inflation heat exchanger parallel branch 66, temperature sensor 67, mounting hole 68, elastic upper cover plate 651, filling material 652, heat storage layer fin 653, transition layer fin 654, upper fixed plate 655, spring 656, through hole 657, lower pressing plate 658, fixed hole 659. DETAILED DESCRIPTION

[0034] The present application will be further described below in conjunction with the drawings, so that those skilled in the art can implement the present application according to the description and the drawings.

[0035] It should be understood that the terms such as "have", "contain" and "include" used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0036] It should be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the materials described are all available from commercial channels unless otherwise specified. In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected", "connected", "mounted" should be understood broadly, for example, it can be fixedly connected, arranged, or detachably connected, arranged, or integrally connected, arranged. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. The order and position indicated by the terms "in order", "through", "pass", "located", "arranged" and the like are based on the order and position shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific order and position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application.

[0037] In the description of this invention, it should be understood that the terms "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include at least one of those features.

[0038] like Figure 1 As shown, in a preferred embodiment of the present invention, a blown plate type high-temperature solid sensible heat storage steam generation system is provided, which includes an inlet pipe 1, an inlet flange pipe 2, an inlet header 3, an inlet branch connecting pipe 4, a branch valve 5, a high-temperature solid heat accumulator body 6, an outlet branch connecting pipe 7, an outlet header 8, an outlet flange pipe 9, an outlet pipe 10, a steam-water separator 11, a steam pipe 12, a return water pipe 13, an inlet pressure sensor 14, an inlet temperature sensor 15, an outlet temperature sensor 16, and an outlet pressure sensor 17. The high-temperature solid heat accumulator body 6 is the core of the system, and it contains a series of parallel blown plate heat exchangers, which are referred to as the blown plate heat exchanger parallel branch 66 in this invention. The specific connection methods of the high-temperature solid heat accumulator body 6 and other components in the system are described in detail below.

[0039] In the system provided in this embodiment, inlet pipe 1 is used to input water to be heated. Inlet pipe 1 and inlet header 3 are connected by inlet flange pipe 2. All parallel branches 66 of the blown plate heat exchangers are arranged in parallel between inlet header 3 and outlet header 8. The inlet of each parallel branch 66 of the blown plate heat exchangers is connected to inlet header 3 by inlet branch connecting pipe 4. Each inlet branch connecting pipe 4 is equipped with a branch valve 5 to control the opening and closing of this inlet branch connecting pipe 4. The outlet of each parallel branch 66 of the blown plate heat exchangers is connected to outlet header 8 by outlet branch connecting pipe 7. Outlet header 8 is connected to the inlet of steam-water separator 11 in sequence through outlet flange pipe 9 and outlet pipe 10. The steam-side outlet of the steam-water separator 11 is connected to the heat-consuming end (i.e., heat user) of the steam network through the steam pipeline 12, and the liquid-side outlet of the steam-water separator 11 is reconnected to the inlet pipeline 1 through the return water pipeline 13, thereby forming a bypass water replenishment cycle for the steam generator, which is used to send the separated saturated water back into the high-temperature solid heat accumulator body 6 together with the newly input water for continued heating.

[0040] In addition, the system provided by the embodiment further comprises temperature and pressure sensors arranged at the inlet and the outlet to detect the temperature and pressure of the inflow and outflow. The inlet pressure sensor 14 and the inlet temperature sensor 15 are arranged on the inlet flange pipe 2, and the outlet temperature sensor 16 and the outlet pressure sensor 17 are arranged on the outlet flange pipe 9. The inlet flange pipe 2 and the outlet flange pipe 9 are both pipes with flange joints, and the inlet flange pipe 2 and the outlet flange pipe 9 are arranged to facilitate detachable connection with other pipes. In addition, since the branch valve 5 is further arranged on each branch, the opening degree of the branch valve 5 can be adjusted in real time according to the data monitored by the inlet pressure sensor 14, the inlet temperature sensor 15, the outlet temperature sensor 16 and the outlet pressure sensor 17, so as to control the amount of water input in the branch.

[0041] Therefore, the process of generating steam by heating water in the system provided by the embodiment can be described as follows: the water to be heated enters the system from the inlet pipe 1, enters the inlet header 3 through the inlet flange pipe 2, and when the water needs to be heated to generate steam, the branch valve 5 is adjusted according to the data of the pressure sensor and the temperature sensor, the water to be heated enters the high-temperature solid heat accumulator body 6 through the inlet branch connecting pipe 4 for heating and vaporization, and then enters the outlet header 8 along the outlet branch connecting pipe 7, and then enters the steam-water separator 11 from the outlet header 8 through the outlet flange pipe 9 and the outlet pipe 10. The saturated water separated by the steam-water separator 11 is recombined into the inlet header 3 through the backwater pipe 13 and then enters the high-temperature solid heat accumulator body 6 for continuous heat exchange, and the steam separated is combined into the steam pipe network through the steam pipe 12 to supply users.

[0042] In the system provided by the embodiment, the high-temperature solid heat accumulator body 6 comprises a heat preservation layer 61, a body frame 62, a solid heat storage layer 63, a heating rod 64, a heat storage and release transition layer 65, a parallel branch of the inflation heat exchanger 66, a temperature sensor 67 and a mounting hole 68.

[0043] The body frame 62 is a carrier for mounting the remaining components. The outer side of the body frame 62 is wrapped with a thermal insulation layer 61 having a very low thermal conductivity, which can provide good thermal insulation effect for the inside of the body frame 62, reduce the heat loss of the internal heat storage body, and enable the heat to be stored as much as possible. The solid heat storage layers 63 and the heat storage and release transition layers 65 are alternately arranged in the body frame 62 along the transverse direction, and the two outermost layers are both solid heat storage layers 63, so that the heat storage and release transition layer 65 is flanked by the solid heat storage layers 63. Each layer of the solid heat storage layer 63 and the heat storage and release transition layer 65 is arranged along the vertical direction. Each layer of the heat storage and release transition layer 65 is filled with a heat-conducting material having fluidity, and a blow plate heat exchanger parallel branch 66 vertically penetrates the heat storage and release transition layer 65, and the blow plate heat exchanger parallel branch 66 needs to be in full heat exchange contact with the heat-conducting material. In this system, the blow plate heat exchanger is used as the heated pipeline. Compared with a circular tube of the same length, the blow plate has a larger specific surface area, which strengthens the heat transfer between the high-temperature heat source and the low-temperature fluid. All the blow plate heat exchanger parallel branches 66 in the body frame 62 are arranged at equal intervals, and the bottom of the blow plate heat exchanger parallel branch 66 is fixedly connected with the bottom plate of the body frame 62 by welding. The heat storage and release transition layer 65 can be clamped and fixed by the blow plate heat exchanger parallel branch 66 and the solid heat storage layer 63.

[0044] Since the material in the heat storage and release transition layer 65 is fluid, in order to fix these materials, a cover plate corresponding to the position of each heat storage and release transition layer 65 needs to be arranged on the body frame 62. The cover plate is arranged in coincidence with the slot opened on the top plate of the body frame 62. When the transition layer medium is a solid, the cover plate needs to seal and ensure the density of the heat transfer medium in the solid heat storage and release transition layer; when the transition layer medium is a phase change material, the cover plate only needs to seal.

[0045] In the embodiment of the present application, the inlet of the blow plate heat exchanger parallel branch 66 is on both sides of the bottom of the high-temperature solid heat storage body 6, and the outlet converges to the center of the top of the high-temperature solid heat storage body 6. Considering the expansion of the volume after the water phase change vaporization, the outlet pipe diameter should be 1.5-3 times the inlet pipe diameter.

[0046] In addition, a plurality of horizontally arranged mounting holes 68 need to be uniformly opened in each layer of the solid heat storage layer 63, and the heating rods 64 are distributed in the solid heat storage layer 63 through the mounting holes for heating the solid heat storage layer 63. In addition, a temperature sensor 67 needs to be inserted into each solid heat storage layer 63, and the sensing end of the temperature sensor 67 should be horizontally inserted into the solid heat storage layer 63, so as to measure the temperature change of the solid heat storage layer 63.

[0047] In the system provided by the embodiment, the high-temperature solid heat accumulator body 6 is a volumetric heat accumulator and heat exchanger, and the solid heat storage layer 63 inside the high-temperature solid heat accumulator body 6 is formed by stacking a series of cuboid-shaped solid heat storage modules. The material of the solid heat storage module can be selected according to actual needs, for example, one or a combination of graphite, metal slag, magnesite, and porous solid heat storage material containing phase change material. A mounting hole can be horizontally formed in the center of the non-splicing end face of each solid heat storage module, and a heating rod 64 can be inserted into the mounting hole to heat the heat storage material in the solid heat storage module, thereby converting excess power into heat energy and storing the heat energy in the high-temperature solid heat accumulator body 6. Generally, a mounting hole of a certain depth can be horizontally formed in the center of each solid heat storage module on two end faces that are not spliced with other modules, and the mounting holes on the two end faces can not be through holes. In order to ensure the uniformity of the internal heating of the heat storage body, the heating rods 64 can be arranged in parallel and at intervals in the entire solid heat storage layer 63, and the heating rods 64 are symmetrically distributed in the fixed heat storage layer 63 with the blow plate heat exchanger parallel branch 66 as the center.

[0048] In the system provided by the embodiment, in addition to arranging the solid heat storage layer 63, the high-temperature solid heat accumulator body 6 is also specially and alternately arranged with a heat storage and release transition layer 65. Both the solid heat storage layer 63 and the heat storage and release transition layer 65 can store heat during the heat storage process, but the blow plate heat exchanger parallel branch 66 is arranged in the heat storage and release transition layer 65, and since the heat storage and release transition layer 65 is filled with a heat-conducting material with fluidity, the contact thermal resistance between the solid heat storage layer 63 and the blow plate heat exchanger parallel branch 66 can be reduced, the thermal resistance between the high-temperature heat source and the low-temperature fluid can be reduced, and the fluidity and deformation ability of the heat-conducting material can be used to reduce the influence of stress and bending on the safety of the heated pipeline during the heat storage and temperature rising process.

[0049] As shown in Figure 3 The heat storage and release transition layer 65 can be a phase change transition layer or a solid transition layer, and only one type needs to be selected and installed in the high-temperature solid sensible heat storage module according to actual needs. The two types of heat storage and release transition layers can well wrap the blow plate heat exchanger, the transition layer is in close contact with the solid heat storage layer, the heat transfer thermal resistance during the heat storage and release process is reduced, the temperature distribution in the heat storage device is reasonably controlled, and the problem of safety reduction of the heated pipeline caused by stress damage can be greatly avoided.

[0050] As shown in Figure 3As shown in the left picture in FIG. 6, the left picture in FIG. 6 shows a solid transition layer 65, that is, the heat-conductive material filled in the solid transition layer is in solid phase. In the embodiment of the present application, the solid transition layer comprises an elastic upper cover plate 651 and a filling material 652. In order to make the filling material 652 in solid phase have the ability of deformation, the filling material 652 is in powder form. The powder form heat-conductive material can be powder form graphite, or powder form high-heat-conductive metal, or a mixture of powder form graphite and powder form high-heat-conductive metal. Since the solid transition layer is located between two adjacent solid heat storage layers 63, and a blow plate heat exchanger parallel branch 66 passes through the solid transition layer, the filling material 652 needs to fill the annular space between the blow plate heat exchanger parallel branch 66 and the two adjacent solid heat storage layers 63. The solid transition layer and the solid heat storage layer 63 do not need special sealing, and can be directly in contact, that is, the boundary of the filling material 652 is directly in contact with the solid heat storage layer 63. The elastic upper cover plate 651 is arranged at the top end of the annular space and is fixedly installed on the top plate of the body frame 62. In order to make the powder form filling material 652 still have good compactness and fully contact the blow plate heat exchanger parallel branch 66, the elastic upper cover plate 651 needs to have elastic elements for compacting the filling material 652 between the two solid heat storage layers 63.

[0051] In the embodiment of the present application, as shown in FIG. 6, Figure 4As shown, a preferred form of the elastic upper cover plate 651 is shown, which includes an upper fixed plate 655, springs 656, through holes 657, and a lower pressing plate 658. The upper fixed plate 655 is arranged parallel to the lower pressing plate 658 and the two are elastically connected by the springs 656. The top plate of the body frame 62 is provided with a mounting groove matching the upper fixed plate 655 at the position of the solid transition layer, and the upper fixed plate 655 is fixed to the top plate of the body frame 62 through the mounting groove. The filling height of the filling material 652 needs to be close to the top surface of the annular space, so that after the elastic upper cover plate 651 is clamped into the mounting groove on the top plate, the lower pressing plate 658 is attached to the surface of the filling material 652, and then the springs 656 are compressed after the upper fixed plate 655 is fixed to the top plate. The lower pressing plate 658 is pressed onto the top surface of the filling material 652 under the action of the springs 656 in the compressed state, achieving the purpose of compacting the filling material 652 but still having a deformation space. The fixing method between the upper fixed plate 655 and the top plate can be designed according to the actual situation. In the embodiment of the present application, the upper fixed plate 655 is provided with fixed holes 659 at both ends, and after the upper fixed plate 655 is placed in the mounting groove on the top plate of the body frame 62, the bolts can be inserted into the fixed holes 659 to screw the upper fixed plate 655 and the top plate of the body frame 62. In addition, since the blow plate heat exchanger parallel branch 66 needs to extend through the elastic upper cover plate 651, the upper fixed plate 655 and the lower pressing plate 658 need to be provided with through holes 657 corresponding thereto, and the outlet branch connecting pipe 7 passes through the through holes 657 to connect the blow plate heat exchanger parallel branch 66.

[0052] As Figure 3As shown in the right part of FIG. 6, the heat storage and release transition layer 65 adopts a phase change transition layer, that is, the heat-conducting material filled in the phase change transition layer is a phase change material that can change phase during heat storage. In the embodiment of the present application, the phase change transition layer includes a filler material 652, a fin-type partition plate, and an upper fixed plate 655. Since the phase change transition layer is filled with a phase change material, it cannot directly use the solid heat storage layer 63 as a boundary as in the solid transition layer. In the method of using the phase change transition layer, the phase change transition layer and the two adjacent solid heat storage layers 63 need to be welded and sealed by a metal partition plate, and the metal partition plate is provided with heat storage layer fins 653 and transition layer fins 654 on both sides, respectively. When the metal partition plate is provided with fins on both sides, it is actually a fin-type partition plate. The heat storage layer fins 653 and the transition layer fins 654 on both sides of the metal partition plate are respectively provided in a direction that needs to be matched and corresponded to the heat storage material, wherein the heat storage layer fins 653 extend into the solid heat storage layer 63, and the transition layer fins 654 extend into the phase change transition layer. Similarly, since the phase change transition layer is located between the two adjacent solid heat storage layers 63, and the phase change transition layer penetrates a blow plate heat exchanger parallel branch 66, the filler material 652 needs to fill the annular space between the blow plate heat exchanger parallel branch 66 and the fin-type partition plate on both sides. The specific material of the filler material 652 can be adjusted according to actual needs, and is preferably a phase change material with a thermal conductivity greater than 10 W / m·K, and the specific material type can be one or more of liquid metal, composite phase change material, and foam metal filled phase change material. The upper fixed plate 655 is arranged at the top end of the annular space between the blow plate heat exchanger parallel branch 66 and the fin-type partition plate on both sides, and is fixedly installed on the top plate of the body frame 62, and is used to enclose the filler material 652 in the annular space.

[0053] It should be noted that when the transition layer medium is a solid transition layer, an elastic upper cover plate 651 with elastic elements (i.e., springs 656 and lower pressing plates 658) needs to be used to ensure the density of the heat transfer medium in the solid heat storage and release transition layer; but when the transition layer medium is a phase change transition layer, the elastic elements are no longer needed, and only the upper fixed plate 655 can play a sealing role. Similarly, the upper fixed plate 655 can also be fixed on the top plate of the body frame 62 by being provided with holes and being fixed by bolts.

[0054] In addition, in the above-mentioned phase transition layer, the fins of different types are arranged on both sides of the metal partition plate to enhance heat exchange, but the installation spacing of the fins on both sides of the metal partition plate can be different, and the spacing of the heat storage layer fins 653 generally needs to be greater than that of the transition layer fins 654. In order to enhance the heat transfer in the solid heat storage layer 63, the spacing of the heat storage layer fins 653 is the thickness of a single layer of solid heat storage modules in the solid heat storage layer 63, so that the heat storage layer fins 653 are located between the horizontal contact surfaces of two solid heat storage modules, which can enhance the heat transfer on the solid side; the transition layer fins 654 in the heat storage and release transition layer 65 are in a perforated plate structure, and the spacing is 1 / 2-1 / 4 of the spacing between adjacent two heat storage layer fins 653, and are arranged in the filler material 652 in the vertical direction.

[0055] In another embodiment of the present application, a steam generation control method is also provided based on the above-mentioned inflation plate type high-temperature solid sensible heat storage steam generation system, which includes a heat storage mode and a steam generation mode. The following will specifically describe the enabling scenarios and specific control methods of the two modes.

[0056] When the power supply is excessive (the power supply is higher than the actual power demand of a certain area), it is necessary to store the power in the form of heat energy, and the heat storage mode is executed. The control method of the heat storage mode is to supply power to the heating rod 64 to start heating the high-temperature solid heat storage body 6, the heating rod 64 consumes electric energy and converts it into heat energy, which is first conducted from the heating rod 64 to the solid heat storage layer 63, and then the heat is further conducted to the heat storage and release transition layer 65, at this time, it is in the heat storage stage, the solid heat storage layer 63 stores heat in the form of sensible heat, and the heat storage and release transition layer 65 stores heat in the form of sensible heat or sensible heat and phase change; the temperature change is monitored by the heat storage body temperature sensor 67, and when the solid heat storage layer 63 and the heat storage and release transition layer 65 are heated to a preset temperature or when the power supply is no longer excessive (the power supply is no longer higher than the actual power demand of a certain area), the heating rod 64 is turned off, and the heating stage is stopped. For the solid heat storage layer 63 and the heat storage and release transition layer 65 that reach the preset temperature, even if the heating is stopped, because the body frame 62 is still wrapped with a heat preservation layer 61 with a very low thermal conductivity outside, the heat preservation layer 61 can provide good heat preservation effect for the inside of the body frame 62, reducing the heat loss of the heat storage body inside the body frame 62, so that the heat can be stored as much as possible.

[0057] When steam is needed, steam generation mode is executed. The control method of steam generation mode is: water to be heated is collected into inlet header 3 through inlet pipeline 1 and inlet flange pipe 2 in turn, and the water from inlet header 3 is simultaneously introduced into each blow plate heat exchanger parallel branch 66 in high temperature solid heat accumulator body 6 through inlet branch connecting pipe 4 and branch valve 5, and first exchanges heat with heat accumulation and release transition layer 65, and after the temperature of heat accumulation and release transition layer 65 is reduced, the heat required by heated water is indirectly provided by heating rod 64 and solid heat accumulation layer 63 through heat accumulation and release transition layer 65; water continuously absorbs heat in each blow plate heat exchanger parallel branch 66, and after phase change, it enters outlet header 8 through outlet branch connecting pipe 7, and finally enters steam-water separator 11 through outlet flange pipe 9 and outlet pipeline 10; the separated saturated water is introduced into inlet header 3 through water return pipeline 13 again, and then enters high temperature solid heat accumulator body 6 to continue heat exchange; the separated steam is introduced into steam pipeline network through steam pipeline 12 to supply users.

[0058] Although the embodiments of the present application have been disclosed as above, it is not limited to the application listed in the specification and the embodiments, and it can be fully applied to various fields suitable for the present application, and other modifications can be easily realized by those skilled in the art, and therefore the present application is not limited to specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. An inflated plate type high temperature solid sensible heat thermal storage steam generating system, characterized by, It comprises an inlet pipeline (1), an inlet flange pipe (2), an inlet header (3), an inlet branch connecting pipe (4), a branch valve (5), a high-temperature solid heat accumulator body (6), an outlet branch connecting pipe (7), an outlet header (8), an outlet flange pipe (9), an outlet pipeline (10), a steam-water separator (11), a steam pipeline (12), a backwater pipeline (13), an inlet pressure sensor (14), an inlet temperature sensor (15), an outlet temperature sensor (16), and an outlet pressure sensor (17). The high-temperature solid heat accumulator body (6) comprises a heat insulation layer (61), a body frame (62), a solid heat storage layer (63), a heating rod (64), a heat storage and release transition layer (65), an inflation heat exchanger parallel branch (66), a temperature sensor (67), and a mounting hole (68). The body frame (62) is wrapped with the heat insulation layer (61) on the outside, and the solid heat storage layer (63) and the heat storage and release transition layer (65) are alternately arranged in the body frame (62) in the transverse direction. Each heat storage and release transition layer (65) is arranged in the vertical direction and is flanked by the solid heat storage layer (63). Each heat storage and release transition layer (65) is filled with a heat-conducting material with fluidity, and a inflation heat exchanger parallel branch (66) is vertically arranged in the heat-conducting material. The heating rod (64) is arranged in the solid heat storage layer (63) through the mounting hole (68) and is used for heating the solid heat storage layer (63). The temperature sensor (67) is arranged in the solid heat storage layer (63) and is used for measuring the temperature change of the solid heat storage layer (63). The inlet pipeline (1) and the inlet header (3) are connected through the inlet flange pipe (2). All the inflation heat exchanger parallel branches (66) are arranged in parallel between the inlet header (3) and the outlet header (8). The inlet of each inflation heat exchanger parallel branch (66) is connected to the inlet header (3) through the inlet branch connecting pipe (4) with the branch valve (5). The outlet of each inflation heat exchanger parallel branch (66) is connected to the outlet header (8) through the outlet branch connecting pipe (7). The outlet header (8) is connected to the inlet of the steam-water separator (11) through the outlet flange pipe (9), the outlet pipeline (10), and the steam pipeline (12) in sequence. The steam side outlet of the steam-water separator (11) is connected to the hot end through the steam pipeline (12). The liquid side outlet of the steam-water separator (11) is connected to the inlet pipeline (1) through the backwater pipeline (13), so that the separated saturated water is sent into the high-temperature solid heat accumulator body (6) together with the newly input water for continuous heating. The inlet pressure sensor (14) and the inlet temperature sensor (15) are arranged on the inlet flange pipe (2), and the outlet temperature sensor (16) and the outlet pressure sensor (17) are arranged on the outlet flange pipe (9).

2. The blown plate high temperature solid sensible heat thermal storage steam generating system according to claim 1, wherein, The solid heat storage layer (63) is stacked by several cuboid-shaped solid heat storage modules, the material of the solid heat storage module is one or a combination of graphite, metal slag, magnesite brick and porous solid heat storage material containing phase change material; each solid heat storage module is horizontally provided with a mounting hole for arranging a heating rod (64) at the center of a non-splicing end face.

3. The blown plate high temperature solid sensible heat thermal storage steam generating system according to claim 1, wherein, The heat storage and release transition layer (65) adopts a solid transition layer, the solid transition layer comprises an elastic upper cover plate (651) and a filling material (652), the filling material (652) is a powdery heat-conducting material; the annular space between the parallel branch (66) of the blown plate heat exchanger and the adjacent two layers of solid heat storage layers (63) is filled with the filling material (652), and the boundary is in direct contact with the solid heat storage layer (63); the elastic upper cover plate (651) is arranged at the top end of the annular space and is fixedly installed on the top plate of the body frame (62), and the elastic upper cover plate (651) is provided with an elastic element for compacting the filling material (652) between the two layers of solid heat storage layers (63).

4. The blown plate high temperature solid sensible heat thermal storage steam generating system according to claim 3, wherein, The powdery heat-conducting material is powdery graphite, powdery high-heat-conducting metal or a mixture of the two.

5. The blown plate high temperature solid sensible heat thermal storage steam generating system according to claim 3, wherein, The elastic upper cover plate (651) comprises an upper fixed plate (655), a spring (656), a through hole (657) and a lower pressing plate (658); the upper fixed plate (655) and the lower pressing plate (658) are arranged in parallel and are elastically connected by the springs (656) therebetween; the top plate of the body frame (62) is provided with a mounting groove matched with the upper fixed plate (655) at the position of the solid transition layer, the upper fixed plate (655) is fixed to the top plate of the body frame (62) through the mounting groove, and the lower pressing plate (658) is pressed onto the top surface of the filling material (652) under the action of the springs (656) in the compressed state; the upper fixed plate (655) and the lower pressing plate (658) are provided with the through hole (657) penetrating therethrough, and the outlet branch connecting pipe (7) passes through the through hole (657) and then connects the parallel branch (66) of the blown plate heat exchanger.

6. The blown plate high temperature solid sensible heat thermal storage steam generating system according to claim 1, wherein, The heat storage and release transition layer (65) adopts a phase change transition layer, the phase change transition layer comprises a filling material (652), a fin-type partition plate and an upper fixed plate (655); the phase change transition layer and the two adjacent solid heat storage layers (63) on the two sides are both sealed by welding metal partition plates, heat storage layer fins (653) and transition layer fins (654) are arranged on the two sides of the metal partition plate respectively to form the fin-type partition plate, wherein the heat storage layer fins (653) extend into the solid heat storage layer (63), and the transition layer fins (654) extend into the phase change transition layer; the annular space between the parallel branch (66) of the blown plate heat exchanger and the two fin-type partition plates is filled with the filling material (652), the filling material (652) is a phase change material with a heat conductivity greater than 10 W / (m·K); the upper fixed plate (655) is arranged at the top end of the annular space and is fixedly installed on the top plate of the body frame (62), and is used for sealing the filling material (652) inside the annular space.

7. The blown plate high temperature solid sensible heat thermal storage steam generating system according to claim 6, wherein, The material type of the phase change material is one or more of liquid metal, composite phase change material, and foam metal filled phase change material; the pitch of the heat storage layer fins (653) is the thickness of a single layer of solid heat storage modules in the solid heat storage layer (63); the transition layer fins (654) are perforated plate structures with a pitch of 1 / 2 to 1 / 4 of the pitch of the heat storage layer fins (653).

8. The blown plate high temperature solid sensible heat thermal storage steam generating system of claim 1, wherein, The heating rods (64) are symmetrically distributed in the solid heat storage layer (63) around the blow plate heat exchanger parallel branch (66).

9. The blown plate high temperature solid sensible heat thermal storage steam generating system according to claim 1, wherein, The inlet of the blow plate heat exchanger parallel branch (66) is on both sides of the bottom of the high-temperature solid heat storage body (6), and the outlet is in the center of the top of the high-temperature solid heat storage body (6), with the outlet pipe diameter being 1.5 to 3 times that of the inlet.

10. A steam generation control method using the high-temperature solid sensible heat storage steam generation system using the inflation plate according to any one of claims 1 to 9, characterized by, It includes a heat storage mode and a steam generation mode. When there is excess power supply, the power needs to be stored in the form of heat energy, and the heat storage mode is executed. The control method of the heat storage mode is to supply power to the heating rods (64) to start heating the high-temperature solid heat storage body (6). The heating rods (64) consume electrical energy and convert it into heat energy. The heat energy is first conducted from the heating rods (64) to the solid heat storage layer (63). After the solid heat storage layer (63) is heated, the heat is further conducted to the heat storage and release transition layer (65). At this time, it is in the heat storage stage. The solid heat storage layer (63) stores heat in the form of sensible heat, and the heat storage and release transition layer (65) stores heat in the form of sensible heat or sensible heat and phase change. The temperature change is monitored by the heat storage body temperature sensor (67). When the solid heat storage layer (63) and the heat storage and release transition layer (65) are heated to the preset temperature or when the power supply is no longer excessive, the heating rods (64) are turned off, and the heating stage stops. When steam is needed, the steam generation mode is executed. The control method of the steam generation mode is to heat the water to be heated by sequentially passing through the inlet pipe (1), the inlet flange pipe (2), and entering the inlet header (3). The water from the inlet header (3) is simultaneously introduced into each blow plate heat exchanger parallel branch (66) in the high-temperature solid heat storage body (6) through the inlet branch connecting pipe (4) and the branch valve (5), and first exchanges heat with the heat storage and release transition layer (65). After the temperature of the heat storage and release transition layer (65) decreases, the heating rods (64) and the solid heat storage layer (63) continue to indirectly provide the heat required by the heated water through the heat storage and release transition layer (65). The water continuously absorbs heat in each blow plate heat exchanger parallel branch (66), undergoes phase change, and then enters the outlet header (8) through the outlet branch connecting pipe (7). After sequentially passing through the outlet flange pipe (9) and the outlet pipe (10), it finally enters the steam-water separator (11). The separated saturated water is re-introduced into the inlet header (3) through the backwater pipe (13) and then enters the high-temperature solid heat storage body (6) for further heat exchange. The separated steam is introduced into the steam pipe network through the steam pipe (12) for use by users.

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