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

Abstract

The invention discloses a blowing-up plate type high-temperature solid sensible heat storage steam generation system and a blowing-up plate type high-temperature solid sensible heat storage steam generation method. The system comprises a solid heat storage module, a heat storage and release transition layer, a blowing plate type steam generator, a heating rod, a steam-water separator and the like. The invention further discloses a heat supply method based on the inflation plate type steam generation system. The roll-bond plate heat exchanger is wrapped by the two heat storage and release transition layers, and the transition layers are in close contact with the solid heat storage layer, so that the heat transfer resistance in the heat storage and release process is reduced, and the temperature distribution in the heat storage device is reasonably controlled. The economical efficiency and applicability of the heat storage and release device in engineering application can be enhanced.

Description

Technical Field

[0001] The invention relates to an inflation plate type high-temperature solid sensible heat storage steam generation system, which belongs to the cross application of sensible heat storage technology in the fields of power peak regulation and heating supply. Background Art

[0002] New energy sources such as wind energy and solar energy have problems such as randomness and intermittency, and cannot meet energy demand well. In order to solve this problem, the research on energy storage technology of "trading space for time" is becoming more and more in-depth. Thermal energy accounts for more than half of global energy consumption, so thermal storage technology occupies a very important position in energy storage technology.

[0003] Thermal storage technology can be divided into three types according to the different thermal storage mechanisms: sensible heat storage, phase change heat storage and thermochemical heat storage.

[0004] Sensible heat storage utilizes the specific heat capacity of heat storage materials to store or release heat by increasing or decreasing the temperature. As the most developed technology at present, sensible heat storage has a wide range of uses in industrial waste heat utilization, power grid peak regulation, home heating, mobile heating, etc. due to its reliable stability and material economy.

[0005] Chinese patent CN115876021A discloses a solid heat storage and steam supply system, wherein the heat storage device is formed by assembling a plurality of block-shaped heat storage materials with special-shaped structures, which can form vertical through holes for a plurality of heat-absorbing straight heat pipes to pass through and horizontal through holes for power supply and heating elements to pass through after assembly. The heat storage material used in this method has a complex structure and high manufacturing cost, and errors during the installation process can easily cause the heat-absorbing straight heat pipes in the vertical through holes to be affected by stress, which may cause deformation risks.

[0006] Chinese patent CN116293603A discloses a device and method for preparing high-quality superheated steam based on solid thermal storage steam. The steam heat exchanger comprises a horizontally arranged tank body; a molten salt pump is installed at the other end of the tank body; a molten salt extraction pipe is installed at the input end of the molten salt pump; and a molten salt circulation pipe is connected to the output end of the molten salt pump. In this method, the problem that the high-temperature heat source and the low-temperature fluid are far apart and the heating between the heat exchange tubes is uneven has not been solved.

[0007] In order to simplify the design and installation of current high-temperature solid sensible heat storage modules, heating rods and heated pipes are often arranged alternately in the heat storage solid. Although this method effectively arranges the high-temperature heat source and the low-temperature fluid, it often brings about complications in design and manufacturing. In addition to increasing processing costs, the pipes and the heat-conducting solids often cannot be completely fitted during operation and installation, which can easily cause stress safety problems. In addition, the contact thermal resistance between the heated pipe and the heat storage solid is often the most important thermal resistance in the heat transfer process, which will seriously hinder the heat transfer process.

[0008] In view of the current problems of complex design structure, stress safety issues and low thermal energy utilization rate caused by contact thermal resistance in high-temperature solid sensible heat storage modules, there is an urgent need for a high-temperature solid sensible heat storage device with a simple and reliable structure that 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. Summary of the invention

[0009] The object of the present invention is to overcome the deficiencies of the prior art and to provide a blowing plate type high temperature solid sensible heat storage steam generation system and method.

[0010] To achieve the above object, the present invention adopts the following technical solutions:

[0011] In a first aspect, the present invention provides a blowing plate type high temperature solid sensible heat storage steam generating 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 return water 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 outer side of the body frame is wrapped with a heat preservation layer, and the solid heat storage layer and the heat storage and release transition layer are arranged alternately in the horizontal direction inside; each heat storage and release transition layer is arranged vertically and both sides are solid heat storage layers; each heat storage and release transition layer is filled with a fluid heat conductive material, and a blown plate heat exchanger parallel branch that forms a sufficient heat exchange contact with the heat conductive material is vertically penetrated inside; a plurality of horizontally arranged mounting holes are evenly opened in each solid heat storage layer, and the heating rods are distributed in the solid heat storage layer through the mounting holes to heat the solid heat storage layer; the sensing end of the temperature sensor is located in the solid heat storage layer to measure the temperature change of the solid heat storage layer;

[0013] The inlet pipeline and the inlet header are connected through an inlet flange pipe, all the parallel branches of the inflatable plate heat exchanger are arranged in parallel between the inlet header and the outlet header, the inlet of each parallel branch of the inflatable plate heat exchanger is connected to the inlet header through an inlet branch connecting pipe with a branch valve, and the outlet of each parallel branch of the inflatable heat exchanger is connected to the outlet header through an outlet branch connecting pipe; the outlet header is connected to the inlet of the steam-water separator through an outlet flange pipe and an outlet pipeline in sequence; the steam side outlet of the steam-water separator is connected to the hot end through a steam pipeline, and the liquid side outlet of the steam-water separator is reconnected to the inlet pipeline through a return water pipeline, so that the separated saturated water is sent back to the high-temperature solid heat accumulator body together with the newly input water for continuous 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 above-mentioned first aspect, the solid heat storage layer is formed by stacking and assembling a number of rectangular solid heat storage modules, and the material of the solid heat storage modules is one or more combinations of graphite, metal slag, magnesia brick, and porous solid heat storage materials containing phase change materials; each solid heat storage module has a mounting hole for arranging a heating rod horizontally opened at the center position of the non-splicing end face.

[0015] As a preferred embodiment of the first aspect above, the heat storage and release transition layer adopts a solid transition layer, and the solid transition layer includes an elastic upper cover plate and a filling material, and the filling material is a powdered heat conductive material; the annular space between the parallel branch of the inflation plate heat exchanger and the two adjacent layers of the solid heat storage layer 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 of the annular space and fixedly mounted on the top plate of the main body frame, and the elastic upper cover plate has an elastic element for compacting the filling material between the two layers of the solid heat storage layer.

[0016] Furthermore, the powdered thermal conductive material is powdered graphite, powdered high thermal conductive metal or a mixture of the two.

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

[0018] As a preferred embodiment of the above-mentioned first aspect, the heat storage and release transition layer adopts a phase change transition layer, and the phase change transition layer includes a filling material, a fin-type partition and an upper fixed plate; the phase change transition layer and the solid heat storage layers adjacent to both sides are welded and sealed with metal partitions, and heat storage layer fins and transition layer fins are respectively arranged on both sides of the metal partition to form the fin-type partition, 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 blown plate heat exchanger and the fin-type partitions on both sides is filled with filling material, and the filling material is a phase change material with a thermal conductivity greater than 10W / ; the upper fixed plate is arranged at the top of the annular space and fixedly installed on the top plate of the main body frame, so as to enclose the filling material in the annular space.

[0019] Furthermore, 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 between the fins of the heat storage layer is the thickness of a single-layer solid heat storage module in the solid heat storage layer; the fins of the transition layer are a perforated plate structure, and the spacing is 1 / 2 to 1 / 4 of the spacing between the fins of the heat storage layer.

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

[0021] As a preferred embodiment of the first aspect, the inlets of the parallel branches of the inflation heat exchanger are on both sides of the bottom of the high-temperature solid heat accumulator body, and the outlet is in the center of the top of the high-temperature solid heat accumulator body, and the outlet pipe diameter is 1.5 to 3 times that of the inlet.

[0022] In a second aspect, the present invention provides a method for controlling steam generation using the inflation plate type high temperature solid sensible heat storage steam generator as described in any one of the first aspects above, which comprises a heat storage mode and a steam generation mode;

[0023] When the power supply is in excess, the power needs to be stored in the form of thermal energy to execute the heat storage mode; the control method of the heat storage mode is as follows: the heating rod is powered to start heating the high-temperature solid heat storage body, the heating rod consumes electrical energy and converts it into thermal energy, the thermal energy is first conducted from the heating rod to the solid heat storage layer, after the solid heat storage layer is heated up, the heat continues to be conducted to the heat storage and release transition layer, 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, 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 in excess, the heating rod is turned off and the heating stage stops;

[0024] When steam needs to be generated, the steam generation mode is executed; the control method of the steam generation mode is as follows: the water to be heated is collected into the inlet header through the inlet pipe and the inlet flange pipe in sequence, the water coming out of the inlet header is simultaneously introduced into each parallel branch of the inflatable plate heat exchanger in the high-temperature solid heat accumulator body through the inlet branch connecting pipe and the branch valve, and firstly exchanges heat with the heat storage and release transition layer, after the temperature of the heat storage and release transition layer is reduced, the heating rod and the solid heat storage layer continue to indirectly provide the heat required for heating the water through the heat storage and release transition layer; the water continuously absorbs heat in each parallel branch of the inflatable plate heat exchanger, enters the outlet header through the outlet branch connecting pipe after phase change, passes through the outlet flange pipe in sequence, and the outlet pipeline finally collects into the steam-water separator, the separated saturated water is collected into the inlet header through the return water pipe again, and then enters the high-temperature solid heat accumulator body for continued heat exchange; the separated steam is collected into the steam network through the steam pipe for user use.

[0025] Compared with the prior art, the main innovations and features of the present invention are:

[0026] (1) The traditional grooving method will produce a complex structure, and the solid heat storage layer and the pipeline are in rigid contact, which is prone to bending and stress concentration during the assembly process. During the heating process, the pipeline is affected by thermal stress and is prone to deformation, which may cause serious safety accidents. In the present invention, 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. Since the transition layer is filled with a highly fluid heat transfer medium, the impact of stress and bending on the safety of the heated pipeline is reduced.

[0027] (2) Two different heat storage and release transition layers are designed in the high-temperature solid sensible heat storage module. For the solid heat storage and release transition layer, the structure is simple and can be in direct contact with the blown plate heat exchanger and the solid heat storage layer. The elastic upper cover plate is used to ensure 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 these two heat storage and release transition layers reduces the contact thermal resistance between the heated pipe 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, because the blown plate heat exchanger has a larger specific surface area than the traditional tube heat exchanger, it also improves the heat exchange efficiency and energy utilization.

[0028] (3) The blown plate heat exchanger used in the present invention has a large pressure bearing capacity. The maximum internal pressure can withstand 8Mpa, the maximum external pressure can withstand 30MPa, and the maximum temperature can withstand 1800°C. Compared with ordinary round tubes, it can produce higher quality steam for users. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural diagram of a blowing plate type high temperature solid sensible heat storage steam generation system;

[0030] Figure 2 It is an exploded view of the main body of a blown plate type high temperature solid heat accumulator;

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

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

[0033] The reference numerals in the figure are as follows: inlet pipeline 1, inlet flange pipe 2, inlet header 3, inlet branch connecting pipe 4, branch valve 5, high-temperature solid heat accumulator body 6, outlet branch connecting pipe 7, outlet header 8, outlet flange pipe 9, outlet pipeline 10, steam-water separator 11, steam pipeline 12, return water pipeline 13, inlet pressure sensor 14, inlet temperature sensor 15, outlet temperature sensor 16, outlet pressure sensor 17, insulation layer 61, body frame 62, solid heat storage layer 63, heating rod 64, heat storage and release transition layer 65, several inflation heat exchanger parallel branches 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 fixing plate 655, spring 656, through hole 657, lower pressure plate 658, fixing hole 659. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0035] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence 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 conventional methods unless otherwise specified, and the materials can be obtained from commercial channels unless otherwise specified; in the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connect", "connected", and "installed" should be understood in a broad sense, for example, they can be fixedly connected, set, or detachably connected, set, or connected and set in one piece. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The order and orientation indicated by the terms "sequentially", "through", "through", "located", "arranged", etc. are based on the order and orientation shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific order and orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for the purpose of distinguishing descriptions, and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features.

[0038] like Figure 1 As shown, in a preferred embodiment of the present invention, a blowing plate type high temperature solid sensible heat storage steam generation system is provided, which includes an inlet pipeline 1, an inlet flange pipe 2, an inlet header 3, an inlet branch connection pipe 4, a branch valve 5, a high temperature solid heat accumulator body 6, an outlet branch connection 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 return water pipeline 13, an inlet pressure sensor 14, an inlet temperature sensor 15, an outlet temperature sensor 16, and an outlet pressure sensor 17. Among them, the high temperature solid heat accumulator body 6 is the core of the system, and has a series of parallel blowing plate heat exchangers inside, which are referred to as the blowing plate heat exchanger parallel branch 66 in the present invention. The specific connection method of the high temperature solid heat accumulator body 6 and other components in the system is described in detail below.

[0039] In the system provided in this embodiment, the inlet pipeline 1 is used to input water to be heated. The inlet pipeline 1 and the inlet header 3 are connected by the inlet flange pipe 2. All the parallel branches 66 of the inflatable plate heat exchanger are arranged in parallel between the inlet header 3 and the outlet header 8. The inlet of each parallel branch 66 of the inflatable plate heat exchanger is connected to the inlet header 3 by the inlet branch connecting pipe 4. Each inlet branch connecting pipe 4 is provided with a branch valve 5 for controlling the opening and closing of the inlet branch connecting pipe 4. The outlet of each parallel branch 66 of the inflatable heat exchanger is connected to the outlet header 8 by 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 and the outlet pipeline 10 in turn. The steam-side outlet of the steam-water separator 11 is connected to the heat-using end of the steam network (i.e., the heat user) 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 steam generator bypass water replenishment cycle, which is used to send the separated saturated water together with the newly input water back into the high-temperature solid heat accumulator body 6 for continued heating.

[0040] In addition, in the system provided in this embodiment, temperature and pressure sensors are also provided at the inlet and outlet to detect the temperature and pressure of the inflow and outflow. Among them, the inlet pressure sensor 14 and the inlet pressure sensor are arranged on the inlet flange pipe 2, and the outlet pressure 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. The purpose of providing the inlet flange pipe 2 and the outlet flange pipe 9 is to facilitate detachable connection with other pipes. In addition, since a branch valve 5 is also provided on each branch, the opening 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 pressure sensor 16 and the outlet pressure sensor 17, thereby controlling the amount of water input into the branch.

[0041] Therefore, in the system provided in this embodiment, the process of heating water to generate steam 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, 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 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 water outlet pipe 10, the saturated water separated by the steam-water separator 11 is re-integrated into the inlet header 3 through the return pipe 13, and then enters the high-temperature solid heat accumulator body 6 for continued heat exchange, and the separated steam is integrated into the steam pipe network through the steam pipe 12 for supply to users.

[0042] In the system provided in this embodiment, the high-temperature solid heat accumulator body 6 includes an 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 an installation hole 68.

[0043] The main body frame 62 is a carrier for installing the remaining components. The outer side of the main body frame 62 is wrapped with a thermal insulation layer 61 with a very low thermal conductivity coefficient. The thermal insulation layer 61 can have a good thermal insulation effect on the inside of the main body frame 62, reduce the heat loss of the internal heat storage body, and allow as much heat as possible to be stored. Solid heat storage layers 63 and heat storage and release transition layers 65 are arranged alternately in the horizontal direction inside the main body frame 62, and the two outermost layers are solid heat storage layers 63, so that both sides of each heat storage and release transition layer 65 are solid heat storage layers 63. Each layer of solid heat storage layer 63 and heat storage and release transition layer 65 are arranged vertically. Each layer of heat storage and release transition layer 65 is filled with fluid heat conductive material, and a blown plate heat exchanger parallel branch 66 is vertically penetrated inside, and the blown plate heat exchanger parallel branch 66 needs to form sufficient heat exchange contact with the heat conductive material. In this system, a blown plate heat exchanger is used as a heat receiving pipeline. Compared with a round tube of the same length, the specific surface area of ​​the blown plate is larger, which strengthens the heat transfer between the high-temperature heat source and the low-temperature fluid. All the blown plate heat exchanger parallel branches 66 inside the main body frame 62 are arranged at equal intervals, and the bottom of the blown plate heat exchanger parallel branch 66 is fixedly connected to the bottom plate of the main body frame 62 by welding. The heat storage and release transition layer 65 can be clamped and fixed to the solid heat storage layer 63 by the blown plate heat exchanger 66.

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

[0045] In an embodiment of the present invention, the inlets of the inflation heat exchanger parallel branch 66 are on both sides of the bottom of the high-temperature solid heat accumulator body 6, and the outlets converge to the top center of the high-temperature solid heat accumulator body 6. Considering the expansion of the volume after the water phase changes and vaporizes, the outlet diameter should be 1.5 to 3 times the inlet diameter.

[0046] In addition, a number of horizontally arranged mounting holes 68 need to be evenly opened in each solid heat storage layer 63, and the heating rods 64 are distributed in the solid heat storage layer 63 through the mounting holes to heat 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 to facilitate the measurement of the temperature change of the solid heat storage layer 63.

[0047] In the system provided in this embodiment, the high-temperature solid heat storage body 6 is a volumetric heat storage heat exchanger, and the solid heat storage layer 63 inside it is composed of a series of rectangular solid heat storage modules stacked and assembled. The material of the solid heat storage module can be selected according to actual needs, for example, a combination of one or more of graphite, metal slag, magnesium brick, and porous solid heat storage materials containing phase change materials can be selected. Each solid heat storage module can have a mounting hole horizontally opened at the center position of the non-joined end face, and a heating rod 64 can be inserted into the mounting hole to heat the heat storage material in the solid heat storage module, and the excess electricity can be converted into heat energy and stored in the high-temperature solid heat storage body 6. Generally speaking, each solid heat storage module can have a mounting hole of a certain depth horizontally opened along the center on the two end faces that will not be joined with other modules, and the mounting holes on the two end faces may not be through. In order to ensure the uniformity of heating inside the heat storage body, the heating rods 64 can be arranged in parallel and spaced in the overall solid heat storage layer 63, and the heating rods 64 are symmetrically distributed in the fixed heat storage layer 63 with the blown plate heat exchanger 66 as the center.

[0048] In the system provided in this embodiment, in addition to the solid heat storage layer 63, the heat storage and release transition layer 65 is specially arranged alternately in the high-temperature solid heat accumulator body 6. The solid heat storage layer 63 and the heat storage and release transition layer 65 can both store heat during the heat storage process, but the blown plate heat exchanger 66 is arranged in the heat storage and release transition layer 65, and because the heat storage and release transition layer 65 is filled with a fluid heat conductive material, the contact thermal resistance between the solid heat storage layer 63 and the blown plate heat exchanger 66 can be reduced, and the thermal resistance between the high-temperature heat source and the low-temperature fluid can be reduced. At the same time, the fluid deformation capacity of the heat conductive material can be used to reduce the impact of stress and bending on the safety of the heated pipe during the heat storage and temperature rise process.

[0049] like Figure 3 As shown, the heat storage and release transition layer 65 can be a phase change transition layer or a solid transition layer. In the high-temperature solid sensible heat storage module, only one type needs to be selected for installation according to the needs. These two types of heat storage and release transition layers can better wrap the blown plate heat exchanger. The transition layer is in close contact with the solid heat storage layer, which reduces the heat transfer resistance during the heat storage and release process, reasonably controls the temperature distribution in the heat storage device, and can greatly avoid the problem of reduced safety of the heated pipeline caused by stress damage.

[0050] like Figure 3As shown in the left figure in the figure, it shows that the heat storage and release transition layer 65 adopts a solid transition layer, that is, the heat conductive material filled in the solid transition layer is in a solid phase. In an embodiment of the present invention, the solid transition layer includes an elastic upper cover plate 651 and a filling material 652. In order to make the solid filling material 652 have deformation ability, the filling material 652 is a powdered heat conductive material. The powdered heat conductive material can be powdered graphite, or powdered high thermal conductivity metal, or a mixture of powdered graphite and powdered high thermal conductivity metal. Since the solid transition layer is located between two adjacent layers of solid heat storage layers 63, and a parallel branch 66 of the inflated plate heat exchanger runs through the solid transition layer, the filling material 652 needs to fill the annular space between the parallel branch 66 of the inflated plate heat exchanger and the two adjacent layers of solid heat storage layers 63. There is no need for special sealing between the solid transition layer and the solid heat storage layer 63, and they can be directly in contact, that is, the boundary of the filling material 652 is in direct contact with the solid heat storage layer 63. The elastic upper cover plate 651 is arranged at the top of the annular space and fixedly mounted on the top plate of the main body frame 62. In order to make the powdered filling material 652 still have good compactness and fully contact the parallel branch 66 of the inflated plate heat exchanger, the elastic upper cover plate 651 needs to be provided with an elastic element for compacting the filling material 652 between the two layers of solid heat storage layers 63.

[0051] In an embodiment of the present invention, Figure 4As shown, a preferred form of the elastic upper cover plate 651 is shown, which includes an upper fixing plate 655, a spring 656, a through hole 657, and a lower pressing plate 658. The upper fixing plate 655 and the lower pressing plate 658 are arranged in parallel and are elastically connected by a plurality of springs 656. A mounting groove matching the upper fixing plate 655 is provided on the top plate of the body frame 62 at the position of the solid transition layer, and the upper fixing 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 above-mentioned annular space, so that after the elastic upper cover plate 651 is inserted 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 spring 656 is compressed after the upper fixing plate 655 is fixed to the top plate, and the lower pressing plate 658 is pressed on the top surface of the filling material 652 under the action of the spring 656 in a compressed state, so as to achieve the purpose of compacting the filling material 652 but still having deformation space. The fixing method between the upper fixing plate 655 and the top plate can be designed according to actual conditions. In the embodiment of the present invention, fixing holes 659 are provided at both ends of the upper fixing plate 655. After the upper fixing plate 655 is placed in the mounting groove on the top plate of the main body frame 62, the bolts can be inserted into the fixing holes 659 to fix the upper fixing plate 655 and the top plate of the main body frame 62 with bolts. In addition, since the parallel branch 66 of the inflatable plate heat exchanger needs to penetrate the elastic upper cover plate 651, the upper fixing plate 655 and the lower pressure plate 658 need to have corresponding through holes 657, and the outlet branch connecting pipe 7 passes through the through holes 657 and is connected to the parallel branch 66 of the inflatable plate heat exchanger.

[0052] like Figure 3As shown in the right figure in the figure, it shows that the heat storage and release transition layer 65 adopts a phase change transition layer, that is, the heat conductive material filled in the phase change transition layer is a phase change material that can undergo phase change during the heat storage process. In an embodiment of the present invention, the phase change transition layer includes a filling material 652, a fin-type partition and an upper fixed plate 655. Since the phase change transition layer is filled with a phase change material, it cannot be directly bounded by a solid heat storage layer 63 like a solid transition layer. In the method of adopting a phase change transition layer, a metal partition is required to be welded and sealed between the phase change transition layer and the solid heat storage layer 63 adjacent to both sides, and heat storage layer fins 653 and transition layer fins 654 are respectively arranged on both sides of the metal partition. When fins are arranged on both sides of the metal partition, it is actually a fin-type partition. The directions of the heat storage layer fins 653 and the transition layer fins 654 on both sides of the metal partition need to match 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 two adjacent layers of solid heat storage layers 63, and a blown plate heat exchanger parallel branch 66 runs through the phase change transition layer, the filling material 652 needs to fill the annular space between the blown plate heat exchanger parallel branch 66 and the fin-type partitions on both sides. The specific material of the filling material 652 can be adjusted according to actual needs, preferably a phase change material with a thermal conductivity greater than 10W / 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 fixing plate 655 is arranged at the top of the annular space between the parallel branch 66 of the inflation plate heat exchanger and the fin-type partitions on both sides, and is fixedly installed on the top plate of the main body frame 62 to seal the filling material 652 inside 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., spring 656 and lower pressure plate 658) is required to ensure the compactness of the heat transfer medium in the solid heat storage and release transition layer; however, when the transition layer medium is a phase change transition layer, elastic elements are no longer required, and only the upper fixing plate 655 is required to play a sealing role. Similarly, the upper fixing plate 655 can also be fixed to the top plate of the main body frame 62 by bolts after opening holes.

[0054] In addition, in the above-mentioned phase change transition layer method, different types of fins are arranged on both sides of the metal partition to enhance heat exchange, but the installation spacing of the fins on both sides of the metal partition can be different, and the spacing of the heat storage layer fins 653 generally needs to be larger than 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 module 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 orifice plate structures, and the spacing is 1 / 2 to 1 / 4 of the spacing between two adjacent heat storage layer fins 653, and are arranged in the filling material 652 at intervals in the vertical direction.

[0055] In another embodiment of the present invention, a steam generation control method is provided based on the above-mentioned inflation plate type high temperature solid sensible heat storage steam generator, which includes a heat storage mode and a steam generation mode. The activation scenarios and specific control methods of the two modes are described in detail below.

[0056] When the power supply is in excess (the power supply is higher than the actual power demand in a certain area), the power needs to be stored in the form of thermal energy to execute the heat storage mode. The control method of the heat storage mode is: power the heating rod 64 to start heating the high-temperature solid heat storage body 6, the heating rod 64 consumes the power and converts it into thermal energy, the thermal energy is first transferred from the heating rod 64 to the solid heat storage layer 63, after the solid heat storage layer 63 is heated up, the heat continues to be transferred 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 in excess (the power supply is no longer higher than the actual power demand in a certain area), the heating rod 64 is turned off and the heating stage stops. For the solid heat storage layer 63 and the heat storage and release transition layer 65 that have reached the preset temperature, even if the heating is stopped, since the outside of the main frame 62 is still covered with a layer of insulation layer 61 with a very low thermal conductivity coefficient, the insulation layer 61 can have a good insulation effect on the inside of the main frame 62, reduce the heat loss of the heat storage body inside the main frame 62, and allow the heat to be stored as much as possible.

[0057] When steam needs to be generated, the steam generation mode is executed. The control method of the steam generation mode is as follows: the water to be heated is introduced into the inlet header 3 through the inlet pipe 1 and the inlet flange pipe 2 in sequence; the water coming out of the inlet header 3 is simultaneously introduced into each parallel branch 66 of the inflatable plate heat exchanger in the high-temperature solid heat accumulator body 6 through the inlet branch connecting pipe 4 and the branch valve 5, and firstly exchanges heat with the heat storage and release transition layer 65; after the temperature of the heat storage and release transition layer 65 is reduced, the heating rod 64 and the solid heat storage layer 63 continue to indirectly provide the heat required for heating the water through the heat storage and release transition layer 65; the water continuously absorbs heat in each parallel branch 66 of the inflatable plate heat exchanger, and after phase change occurs, enters the outlet header 8 through the outlet branch connecting pipe 7, and then passes through the outlet flange pipe 9 and the outlet pipe 10 in sequence, and finally enters the steam-water separator 11; the separated saturated water is re-introduced into the inlet header 3 through the return pipe 13, and then enters the high-temperature solid heat accumulator body 6 for further heat exchange; the separated steam is introduced into the steam network through the steam pipe 12 for supply to users.

[0058] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A blowing plate type high temperature solid sensible heat storage steam generation system, characterized in that: It comprises an inlet pipeline (1), an inlet flange pipe (2), an inlet header (3), an inlet branch connection pipe (4), a branch valve (5), a high-temperature solid heat accumulator body (6), an outlet branch connection 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 return water 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-insulating 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 an inflation heat exchanger (66), a temperature sensor (67), and a mounting hole (68); the heat-insulating layer (61) is wrapped around the outside of the body frame (62), and the solid heat storage layer (63) and the heat storage and release transition layer (65) are alternately arranged in the transverse direction inside; each layer of the heat storage and release transition layer (65) is arranged in the vertical direction and both sides are solid heat storage layers (63); each layer of the heat storage and release transition layer (65) is arranged in the vertical direction and both sides are solid heat storage layers (63); The transition layer (65) is filled with a fluid heat-conducting material, and has a parallel branch (66) of an inflation plate heat exchanger vertically penetrating therein, which forms a sufficient heat exchange contact with the heat-conducting material; a plurality of horizontally arranged mounting holes (68) are evenly opened in each solid heat storage layer (63), and the heating rods (64) are distributed in the solid heat storage layer (63) through the mounting holes, and are used to heat the solid heat storage layer (63); the sensing end of the temperature sensor (67) is located in the solid heat storage layer (63), and is used to measure the temperature change of the solid heat storage layer (63); The inlet pipeline (1) and the inlet header (3) are connected via an inlet flange pipe (2); all the parallel branches (66) of the inflation plate heat exchangers are arranged in parallel between the inlet header (3) and the outlet header (8); the inlet of each parallel branch (66) of the inflation plate heat exchanger is connected to the inlet header (3) via an inlet branch connecting pipe (4) with a branch valve (5); the outlet of each parallel branch (66) of the inflation plate heat exchanger is connected to the outlet header (8) via an outlet branch connecting pipe (7); the outlet header (8) is connected in sequence via an outlet flange pipe (9), an outlet pipeline ( 10) is connected to the inlet of the steam-water separator (11); the steam-side outlet of the steam-water separator (11) is connected to the hot end 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), so that the separated saturated water is sent together with the newly input water into the high-temperature solid heat accumulator body (6) for further 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 inflation plate type high temperature solid sensible heat storage steam generation system according to claim 1, characterized in that: The solid heat storage layer (63) is formed by stacking and assembling a plurality of rectangular solid heat storage modules, wherein the material of the solid heat storage modules is one or more combinations of graphite, metal slag, magnesium brick, and porous solid heat storage materials containing phase change materials; each solid heat storage module has a mounting hole for arranging a heating rod (64) horizontally provided at the center of a non-joined end face.

3. The inflation plate type high temperature solid sensible heat storage steam generation system according to claim 1, characterized in that: The heat storage and release transition layer (65) adopts a solid transition layer, and the solid transition layer includes an elastic upper cover plate (651) and a filling material (652), and the filling material (652) is a powdered heat conductive material; the annular space between the parallel branch (66) of the inflation plate heat exchanger and the two adjacent 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 of the annular space and fixedly installed on the top plate of the main body frame (62), and the elastic upper cover plate (651) has an elastic element for compacting the filling material (652) between the two layers of solid heat storage layers (63).

4. The inflation plate type high temperature solid sensible heat storage steam generation system according to claim 3, characterized in that: The powdered heat-conducting material is powdered graphite, powdered high-thermal-conductivity metal, or a mixture of the two.

5. The inflation plate type high temperature solid sensible heat storage steam generation system according to claim 3, characterized in that: The elastic upper cover plate (651) includes an upper fixing plate (655), a spring (656), a through hole (657), and a lower pressure plate (658); the upper fixing plate (655) and the lower pressure plate (658) are arranged in parallel and are elastically connected via a plurality of springs (656); a mounting groove matching the upper fixing plate (655) is provided on the top plate of the main body frame (62) at the position of the solid transition layer, the upper fixing plate (655) is fixed to the top plate of the main body frame (62) via the mounting groove, and the lower pressure plate (658) is pressed onto the top surface of the filling material (652) under the action of the spring (656) in a compressed state; a through hole (657) is provided on the upper fixing plate (655) and the lower pressure plate (658), and the outlet branch connecting pipe (7) passes through the through hole (657) and is connected to the parallel branch (66) of the inflation plate heat exchanger.

6. The inflation plate type high temperature solid sensible heat storage steam generation system according to claim 1, characterized in that: The heat storage and release transition layer (65) adopts a phase change transition layer, and the phase change transition layer includes a filling material (652), a fin-type partition and an upper fixed plate (655); the phase change transition layer and the solid heat storage layer (63) adjacent to both sides are welded and sealed with metal partitions, and heat storage layer fins (653) and transition layer fins (654) are respectively arranged at intervals on both sides of the metal partition to form the fin-type partition, wherein the heat storage layer fins (653) extend into the interior of the solid heat storage layer (63), and the transition layer fins (654) are arranged at intervals on both sides of the metal partition. The transition layer fins (654) extend into the interior of the phase change transition layer; the annular space between the parallel branch (66) of the inflation plate heat exchanger and the fin-type partitions on both sides is filled with a filling material (652), wherein the filling material (652) is a phase change material with a thermal conductivity greater than 10 W / (m·K); the upper fixing plate (655) is arranged at the top of the annular space and fixedly mounted on the top plate of the main body frame (62), so as to seal the filling material (652) inside the annular space.

7. The inflation plate type high temperature solid sensible heat storage steam generation system according to claim 6, characterized in that: 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 (653) is the thickness of a single layer of solid heat storage module in the solid heat storage layer (63); the transition layer fins (654) are of a perforated plate structure, and the spacing is 1 / 2 to 1 / 4 of the spacing of the heat storage layer fins (653).

8. The inflation plate type high temperature solid sensible heat storage steam generator according to claim 1, characterized in that: The heating rods (64) are symmetrically distributed in the solid heat storage layer (63) with the parallel branch (66) of the inflation plate heat exchanger as the center.

9. The inflation plate type high temperature solid sensible heat storage steam generator according to claim 1, characterized in that: The inlet of the inflation heat exchanger parallel branch (66) is located on both sides of the bottom of the high-temperature solid heat accumulator body (6), and the outlet is located in the center of the top of the high-temperature solid heat accumulator body (6). The outlet pipe diameter is 1.5 to 3 times that of the inlet.

10. A method for controlling steam generation using the inflation plate type high temperature solid sensible heat storage steam generator according to any one of claims 1 to 9, characterized in that: Includes heat storage mode and steam generation mode; When the power supply is in excess, the power needs to be stored in the form of thermal energy to execute the heat storage mode; the control method of the heat storage mode is as follows: power is supplied to the heating rod (64) to start heating the high-temperature solid heat storage body (6); the heating rod (64) consumes the power and converts it into thermal energy; the thermal energy is firstly transferred from the heating rod (64) to the solid heat storage layer (63); after the solid heat storage layer (63) is heated up, the heat is further transferred to the heat storage and release transition layer (65); at this time, the heat storage stage is in progress; the solid heat storage layer (63) stores heat in the form of sensible heat; 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 a preset temperature or when the power supply is no longer in excess, the heating rod (64) is turned off and the heating stage is stopped; When steam needs to be generated, the steam generation mode is executed; the control method of the steam generation mode is as follows: the water to be heated is collected into the inlet header (3) through the inlet pipeline (1) and the inlet flange pipe (2) in sequence; the water coming out of the inlet header (3) is simultaneously introduced into each of the parallel branches (66) of the expansion plate heat exchanger in the high-temperature solid heat storage body (6) through the inlet branch connection pipe (4) and the branch valve (5); and heat is first exchanged with the heat storage and release transition layer (65); after the temperature of the heat storage and release transition layer (65) is reduced, the heating rod (64) and the solid heat storage layer (63) continue to indirectly provide the heat required for heating the water through the heat storage and release transition layer (65); Water continuously absorbs heat in each parallel branch (66) of the inflation plate heat exchanger, and after phase change, enters the outlet header (8) through the outlet branch connecting pipe (7), passes through the outlet flange pipe (9) in sequence, and finally enters the steam-water separator (11) through the outlet pipeline (10). The separated saturated water re-enters the inlet header (3) through the return water pipeline (13) and then enters the high-temperature solid heat accumulator body (6) to continue heat exchange; the separated steam is collected into the steam network through the steam pipeline (12) for supply to users.

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