Steam preparation system and control method thereof

Abstract

The invention discloses a steam preparation system and a control method thereof. The steam preparation system comprises a heat storage body, a circulating fan and a steam generator which are communicated through an air duct, and a medium is introduced into the air duct; the bypass air duct is provided with an adjusting device adopting the inlet air temperature of the inlet of the steam generator as a control signal, and the rotating speed of the circulating fan is controlled by adopting the air outlet flow of the outlet air duct of the circulating fan. The two air channels are arranged, one air channel is communicated with the steam generator after passing through the heat storage body, the other air channel is directly communicated with the steam generator, the adjusting device in one air channel is adjusted through the inlet air temperature of the steam generator, the air temperature change of the inlet of the steam generator is directly tracked, the adjusting link is reduced, and therefore the response speed is increased. Meanwhile, the rotating speed of the fan is adjusted by tracking the air volume change of the outlet of the circulating fan, and the problems of system overpressure or insufficient pressure rise and the like caused by the fact that the pressure rise of the fan is not matched with the external air duct resistance are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of sensible heat energy storage, in particular to a steam preparation system and its control method. Background Art

[0002] The steam is prepared based on the electric heating solid heat storage technology by using a wind circulation system. The wind circulation system can be used for various solid heat storage materials, such as new high-temperature carbon-based heat storage bricks, magnesite bricks, rocks, concrete, etc. The high-temperature superheated steam generated by the steam generator in the heat storage device can be used in many industries and fields that require heat energy, such as chemical industry, coal, smelting, food processing, etc.

[0003] The global energy structure is gradually transforming towards a direction dominated by renewable energy. However, renewable energy sources such as solar energy and wind energy have the characteristics of intermittency and instability, and their power generation is affected by factors such as weather and seasons, resulting in large fluctuations in power supply. Energy storage (including heat storage) technology enables energy to be stored when renewable energy generation is excessive and released when generation is insufficient, thereby smoothing the fluctuations of renewable energy, increasing its proportion in the energy structure, and promoting the realization of energy transformation.

[0004] Solid heat storage materials are usually stacked in the form of heat storage bricks, and square cavities are formed by alternating stacking of the heat storage bricks. An electric heating device is arranged in the square cavities formed by the stacking for heating, and at the same time, the cavities also serve as air ducts for the flow of gas (medium) during heat release. Currently, the common solid heat storage heating systems that have been implemented include heat exchangers of types such as air - hot water, air - air, air - steam, air - heat transfer oil, etc. One scenario is as follows: taking the air - hot water heat exchanger as an example, during the heat release process, the fan blows air over the heat storage body for heat storage to heat the air, and then the hot air exchanges heat with water to generate hot water for heating or other uses.

[0005] Commonly used heat storage materials include: solid magnesite bricks, concrete, rocks, etc. Conventional solid heat storage materials usually have problems such as low energy storage density, large system volume, large temperature output fluctuations, and large heat losses. For the system that exchanges heat with conventional solid heat storage materials in the prior art, air is usually used as the heat transfer medium. According to different user requirements, an open system or a closed - loop system will be adopted. The current process systems supporting conventional heat storage devices mainly have the following problems:

[0006] The process system supporting the heat storage materials usually uses a variable - frequency fan as the only adjustment means to track the temperature changes of the heat storage materials during the heat absorption and release processes. This adjustment method has many links between the target parameters and the adjustment means, and the response speed of the adjustment is slow. Summary of the Invention

[0007] Based on this, it is necessary to provide a steam preparation system and its control method to solve the technical problem of slow adjustment response speed of the existing steam preparation system.

[0008] The present invention provides a steam preparation system, including: a heat storage body, a circulation fan, and a steam generator connected through an air duct. A medium is introduced into the air duct. The air duct includes a circulation fan outlet air duct connected to the outlet of the circulation fan, a heat storage body inlet air duct connected to the inlet of the heat storage body, a heat storage body outlet air duct connected to the outlet of the heat storage body, a steam generator inlet air duct connected to the inlet of the steam generator, a steam generator outlet air duct from the outlet of the steam generator to the inlet of the circulation fan, and a bypass air duct. Among them, the circulation fan outlet air duct is respectively connected to the heat storage body inlet air duct and the bypass air duct, and the heat storage body outlet air duct and the bypass air duct are respectively connected to the steam generator inlet air duct;

[0009] An adjusting device using the inlet air temperature of the steam generator as a control signal is installed on the bypass air duct, and the rotation speed of the circulation fan is controlled by the air flow rate of the circulation fan outlet air duct.

[0010] Further, the adjusting device is a regulating valve or a damper, and the opening degree of the regulating valve or the damper is controlled according to the inlet air temperature of the steam generator as a control signal.

[0011] Further, the circulation fan is a variable-frequency fan, and the rotation speed of the variable-frequency fan is controlled according to the air flow rate of the circulation fan outlet air duct.

[0012] Further, a temperature sensor communicatively connected to the adjusting device is provided on the steam generator inlet air duct.

[0013] Further, a flow measurement device communicatively connected to the circulation fan is provided on the circulation fan outlet air duct.

[0014] Still further, the medium is air or an inert gas.

[0015] Still further, the heat storage body is a solid heat storage body, and the solid heat storage body adopts an operation mode of intermittent heat storage and continuous heat release or intermittent heat storage and intermittent heat release.

[0016] The present invention provides a control method for the steam preparation system as described above, including:

[0017] Measuring the inlet air temperature of the steam generator, and controlling the opening degree of the adjusting device according to the comparison result between the inlet air temperature of the steam generator and the temperature threshold;

[0018] Measure the air output flow of the outlet air duct of the circulation fan, and control the rotation speed of the circulation fan according to the comparison result between the air output flow and the flow threshold value.

[0019] Further, the regulating device is a regulating valve or a damper. Controlling the opening degree of the regulating device according to the comparison result between the inlet air temperature of the steam generator and the temperature threshold value includes:

[0020] When the inlet air temperature of the steam generator is greater than the temperature threshold value, increase the opening degree of the regulating valve or the damper;

[0021] When the inlet air temperature of the steam generator is less than the temperature threshold value, reduce the opening degree of the regulating valve or the damper.

[0022] Further, the circulation fan is a variable-frequency fan. Controlling the rotation speed of the circulation fan according to the comparison result between the air output flow and the flow threshold value includes:

[0023] When the air flow at the outlet of the fan is greater than the flow threshold value, downshift the rotation speed of the variable-frequency fan;

[0024] When the air flow at the outlet of the fan is less than the flow threshold value, increase the rotation speed of the variable-frequency fan.

[0025] The present invention is provided with two air ducts. One air duct is connected to the steam generator after passing through the heat storage body, and the other air duct is directly connected to the steam generator. The regulating device in one of the air ducts is adjusted according to the inlet air temperature of the steam generator, directly tracking the change of the inlet air temperature of the steam generator, reducing the adjustment link, and thus improving the response speed. At the same time, by tracking the change of the air volume at the outlet of the circulation fan, the rotation speed of the fan is adjusted to avoid problems such as system overpressure or insufficient pressure rise caused by the mismatch between the fan pressure rise and the external air duct resistance. Description of the Drawings

[0026] Figure 1 It is the system schematic diagram of a steam preparation system according to an embodiment of the present invention;

[0027] Figure 2 It is the working flow chart of a control method of a steam preparation system as described above according to an embodiment of the present invention.

[0028] Marking Description

[0029] 1. Heat storage body; 2. Circulation fan; 3. Steam generator; 31. Water supply end; 32. Water supply pipe; 33. Steam pipe; 34. Superheated steam end; 35. Steam drum; 4. Outlet air duct of the circulation fan; 5. Inlet air duct of the heat storage body; 6. Outlet air duct of the heat storage body; 7. Inlet air duct of the steam generator; 8. Outlet air duct of the steam generator; 9. Bypass air duct; 10. Temperature sensor; 11. Regulating valve; 12. Flow measurement device. Detailed Embodiments

[0030] The following further describes the detailed embodiments of the present invention with reference to the accompanying drawings. The same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "inner" and "outer" refer to the directions towards or away from the geometric center of a specific component, respectively.

[0031] As Figure 1 shown in an embodiment of the present invention, a steam preparation system includes: a heat storage body 1, a circulation fan 2, and a steam generator 3 connected through a wind duct. A medium is introduced into the wind duct. The wind duct includes a circulation fan outlet duct 4 connected to the outlet of the circulation fan 2, a heat storage body inlet duct 5 connected to the inlet of the heat storage body 1, a heat storage body outlet duct 6 connected to the outlet of the heat storage body 1, a steam generator inlet duct 7 connected to the inlet of the steam generator 3, a steam generator outlet duct 8 from the outlet of the steam generator 3 to the inlet of the circulation fan 2, and a bypass duct 9. Among them, the circulation fan outlet duct 4 is respectively connected to the heat storage body inlet duct 5 and the bypass duct 9, and the heat storage body outlet duct 6 and the bypass duct 9 are respectively connected to the steam generator inlet duct 7;

[0032] An adjustment device that uses the inlet air temperature of the steam generator 3 as a control signal is installed on the bypass duct 9, and the rotation speed of the circulation fan 2 is controlled by the air flow rate at the outlet of the circulation fan outlet duct 4.

[0033] Specifically, to solve the problems of poor adjustment accuracy and slow response speed, the present invention adopts a double-closed-loop control method, which significantly shortens the response time of the target parameters. It effectively realizes the provision of continuous and parameter-stable superheated steam to the client.

[0034] The steam preparation system of the present invention mainly includes the following equipment: a heat storage body 1, a circulation fan 2, and a steam generator 3. The present invention uses air or inert gas as the heat transfer carrier between the system heat source and cold source, and can make full use of the heat energy converted from new energy (such as photovoltaic) power generation to meet the production demand of providing superheated steam with certain parameters to a certain process system in the factory continuously. On the one hand, it allows the solid heat storage body to adopt an operation mode of intermittent heat storage and continuous heat release or intermittent heat storage and intermittent heat release. On the other hand, through the ingenious configuration of the air circulation system, the continuous and stable operation of the steam generator can be realized. In this way, it effectively makes up for the various potential risks brought by the unstable power generation of new energy to the end user (a certain process system), and opens up a new process route in the energy storage field.

[0035] The solid heat storage body 1 adopts various flexible operation modes such as intermittent heat storage and continuous heat release or intermittent heat storage and intermittent heat release. The closed air circulation system is used to realize the heat absorption and heat release processes of the whole system.

[0036] During the heat storage process, as the electric heating device heats the solid heat storage body, the temperature of the heat storage body 1 will gradually rise; when there is no heat storage, as the heat release process of the solid heat storage body continues, the temperature of the heat storage body 1 will gradually decrease.

[0037] Whether heat storage and heat release are carried out simultaneously or during the pure heat release process, the circulating fan 2 circulates the sealed medium in the air duct, and the medium flowing through the heat storage body 1 causes the temperature of the medium to rise. The heat energy carried by the high-temperature medium is released on the side of the steam generator 3, heating the deaerated feed water into finished steam to complete the steam preparation process.

[0038] In some instances, there will also be a steam drum 35. The feed water end 31 is connected to the steam drum 35 through a feed water pipe 32, and the steam drum 35 is communicated with the superheated steam end 34 through a steam pipe 33. Part of the feed water pipe 32 and the steam pipe 33 are placed inside the steam generator 3. Feed water enters the steam generator 3 from the feed water end 31 through the feed water pipe 32, is heated and then enters the steam drum 35. The water in the steam drum is heated again in the steam generator by the "natural circulation" method, and the gradually generated steam is introduced into the steam drum 35 again. The steam is discharged from the top of the steam drum 35, enters the steam generator 3 again through the steam pipe 33, becomes superheated steam, and finally is discharged from the superheated steam end 34 to complete the steam preparation process.

[0039] In this embodiment, the heat storage body 1, the circulation fan 2, and the steam generator 3 are connected through an air duct to form a closed-loop circulation system. In this embodiment, the medium in the closed-loop circulation is mixed in temperature to achieve the precise control goal of generating finished steam with stable parameters. The main design scheme of the temperature mixing method is as follows: The air pressurized by the circulation fan 2 is discharged from the outlet air duct 4 of the circulation fan and is divided into two paths: One path flows through the heat storage body 1 through the inlet air duct 5 of the heat storage body and is heated into hot air; the other path of air does not enter the heat storage body (remaining cold air), flows through the bypass air duct 9 beside the heat storage body 1, and mixes with the hot air heated by the heat storage body in the outlet air duct 6 of the heat storage body at the inlet air duct 7 of the steam generator, and then enters the steam generator 3, and returns to the circulation fan through the outlet air duct of the steam generator to form a closed loop. The precise control goal is: No matter whether the temperature of the heat storage body 1 is gradually decreasing or increasing, the temperature of the medium at the inlet and outlet of the steam generator 3 can be maintained unchanged, so that the steam generator 3 always operates under stable working conditions, thereby ensuring the stable flow and parameters of the generated finished steam. The adjustment means for realizing that the temperature of the inlet medium of the steam generator 3 does not change during the heating or cooling process of the heat storage body 1 is: An adjustment device is installed on the bypass air duct 9, and its control signal is the temperature measured at the inlet of the steam generator 3, that is, the inlet air temperature.

[0040] In one of the embodiments, the adjustment device is a control valve 11 or a damper, and the opening degree of the control valve 11 or the damper is controlled according to the air temperature at the inlet of the steam generator 3 as the control signal.

[0041] Specifically, this embodiment uses the control valve 11 or the damper as the adjustment device.

[0042] When the outlet air temperature of the heat storage body 1 increases, the opening degree of the control valve 11 (or the damper) increases (the flow rate of the cold air increases); when the outlet air temperature of the heat storage body 1 decreases, the opening degree of the control valve 11 (or the damper) decreases.

[0043] In one of the embodiments, a temperature sensor 10 communicatively connected to the adjustment device is provided in the inlet air duct 7 of the steam generator.

[0044] Specifically, a temperature sensor 10 is provided on the inlet air duct of the steam generator 3, and the opening degree of the adjustment device (the control valve 11 or the damper) is controlled according to the remote temperature signal of the temperature sensor 10 to achieve precise control of the mixed air temperature.

[0045] In addition, for a closed-loop system, stabilizing the system pressure is another core point that needs to be controlled. In this embodiment, the rotation speed of the circulation fan 2 is controlled by measuring the air flow rate at the outlet of the circulation fan outlet air duct 4 that is connected to the outlet of the circulation fan 2, so that the actual pressure rise of the circulation fan 2 is always consistent with the resistance of the external air duct, thereby ensuring the pressure balance of the entire closed-loop system and avoiding problems such as system overpressure or insufficient pressure rise caused by the mismatch between the fan pressure rise and the external air duct resistance.

[0046] In one embodiment, the circulation fan 2 is a variable-frequency fan, and the rotation speed of the variable-frequency fan is controlled according to the air flow rate at the outlet of the circulation fan outlet air duct 4.

[0047] Specifically, a variable-frequency fan is used as the circulation fan 2. The air flow rate at the outlet of the circulation fan outlet air duct 4 is the air flow rate of the circulation fan 2. The rotation speed of the circulation fan 2 with variable-frequency adjustment is controlled according to the air flow rate at the outlet of the circulation fan outlet air duct 4, and the actual pressure rise of the circulation fan 2 is made consistent with the resistance of the external air duct through variable-frequency adjustment.

[0048] In one embodiment, a flow measurement device 12 communicatively connected to the circulation fan 2 is provided in the circulation fan outlet air duct 4.

[0049] Specifically, the rotation speed of the circulation fan 2 with variable-frequency adjustment is controlled by the outlet air flow rate detected by the flow measurement device 12 provided at the outlet of the circulation fan outlet air duct 4 (i.e., the air outlet of the circulation fan 2), and the actual pressure rise of the circulation fan 2 is made consistent with the resistance of the external air duct through variable-frequency adjustment.

[0050] Figure 1 two logic control lines ( Figure 1 the dotted lines in

[0051] clearly show the control signals of the regulating device (being the regulating valve 11) and the circulation fan 2.

[0052] In one embodiment, the medium is air or an inert gas.

[0053] Specifically, air or other highly pure inert gases are used as the medium.

[0054] In this embodiment, in a closed air circulation process system, a mixed temperature regulation scheme is adopted. And two control loops are used to form two completely independent closed-loop systems. In each loop, the control target and the control input quantity are unique, achieving precise control of the unsteady process quantity in the system. Thus, the ultimate goal of providing continuous and parameter-stable superheated steam to the client is well realized. The present invention has more obvious advantages especially for process systems with very high requirements for steam parameter accuracy.

[0055] This embodiment adopts a closed air circulation system with a mixed temperature method, which can be matched with various solid heat storage materials to produce steam systems. The application scenarios of this embodiment in the field of heat storage are very extensive.

[0056] The present invention is provided with two air ducts. One is connected to the steam generator 3 after passing through the heat storage body, and the other is directly connected to the steam generator 3. The regulating device (control valve or air damper) in one of the air ducts is adjusted through the inlet air temperature of the steam generator, directly tracking the change of the air temperature, reducing the adjustment link, and thus improving the response speed. At the same time, the rotation speed of the fan is adjusted by the air flow rate at the outlet of the fan, avoiding problems such as system overpressure or insufficient pressure rise caused by the mismatch between the fan pressure rise and the external air duct resistance.

[0057] In this embodiment, the air volume of the bypass air duct is controlled by the control valve 11 or the air damper. According to the inlet temperature signal of the steam generator, the opening degree of the control valve 11 or the air damper is directly adjusted to achieve precise control of the mixed air temperature, solving the problem of poor adjustment accuracy in the prior art. At the same time, a circulating fan with a frequency conversion function is adopted, and the actual boost pressure of the circulating fan is changed according to the air flow rate at the outlet of the circulating fan by adjusting the rotation speed of the variable-frequency fan, avoiding problems such as system overpressure or insufficient pressure rise caused by the mismatch between the fan pressure rise and the external air duct resistance.

[0058] As Figure 2 shown is the working flow chart of the control method of the steam preparation system in the embodiment of the present invention, including:

[0059] Step S_{201}, measure the inlet air temperature of the steam generator 3, and control the opening degree of the regulating device according to the comparison result between the inlet air temperature of the steam generator and the temperature threshold;

[0060] Step S_{202}, measure the air flow rate at the outlet air duct 4 of the circulating fan, and control the rotation speed of the circulating fan 2 according to the comparison result between the air flow rate and the flow threshold.

[0061] Specifically, step S_{201} and step S_{202} are executed in parallel.

[0062] Among them, in step S201, measure the inlet air temperature of the steam generator 3, and control the opening degree of the regulating device according to the comparison result between the inlet air temperature of the steam generator and the temperature threshold.

[0063] Specifically, a temperature sensor 10 can be set on the inlet air duct of the steam generator 3, and the inlet air temperature of the steam generator 3 can be obtained from the temperature remote transmission signal of the temperature sensor 10. Compare the measured inlet air temperature of the steam generator with the preset temperature threshold, and control the regulating device according to the comparison result.

[0064] In one embodiment, the regulating device is a regulating valve 11 or a damper. The controlling the opening degree of the regulating device according to the comparison result between the inlet air temperature of the steam generator and the temperature threshold includes:

[0065] When the inlet air temperature of the steam generator 3 is greater than the temperature threshold, increase the opening degree of the regulating valve 11 or the damper;

[0066] When the inlet air temperature of the steam generator 3 is less than the temperature threshold, reduce the opening degree of the regulating valve 11 or the damper.

[0067] Specifically, when the outlet air temperature of the heat storage body 1 rises, the opening degree of the electric regulating valve 11 (or the damper) increases (the flow rate of the cold air increases); while when the outlet air temperature of the heat storage body 1 drops, the opening degree of the regulating valve 11 (or the damper) will decrease, realizing precise control of the mixed air temperature.

[0068] In some embodiments, the PID (Proportion Integral Differential) algorithm, that is, the proportional (P), integral (I) and differential algorithms, is adopted to control the regulating device according to the comparison result between the actual inlet air temperature of the steam generator and the temperature threshold.

[0069] In step S202, measure the outlet air flow rate of the outlet air duct 4 of the circulation fan, and control the rotation speed of the circulation fan 2 according to the comparison result between the outlet air flow rate and the flow rate threshold.

[0070] Specifically, a flow measurement device 12 can be set at the outlet of the circulation fan 2, that is, the outlet air duct 4 of the circulation fan. Obtain the actual air volume at the fan outlet as the outlet air flow rate from the flow measurement device 12, compare the outlet air flow rate with the flow rate threshold, and control the rotation speed of the circulation fan 2 according to the comparison result.

[0071] In one embodiment, the circulation fan 2 is a variable-frequency fan. The controlling the rotation speed of the circulation fan 2 according to the comparison result between the outlet air flow rate and the flow rate threshold includes:

[0072] When the outlet air flow rate is greater than the flow rate threshold, reduce the rotation speed of the variable-frequency fan;

[0073] When the air outlet flow rate is less than the flow rate threshold, increase the rotational speed of the variable-frequency fan.

[0074] Specifically, for a closed-loop system, stabilizing the system pressure is another core point that needs to be controlled. In this embodiment, a circulation fan 2 with variable-frequency regulation is adopted. The actual air volume at the outlet detected by the flow measurement device 12 provided at the outlet of the circulation fan 2 is used to control the rotational speed of the circulation fan 2 with variable-frequency regulation. Through variable-frequency regulation, the actual pressure rise of the circulation fan 2 is always kept consistent with the resistance of the external air duct, so as to ensure the pressure balance of the entire closed-loop system and avoid problems such as system overpressure or insufficient pressure rise caused by the mismatch between the fan pressure rise and the external air duct resistance.

[0075] In some embodiments, a PID algorithm is adopted to control the rotational speed of the circulation fan 2 according to the comparison result between the air flow rate at the fan outlet and the flow rate threshold.

[0076] The adjustment device in this embodiment controls the temperature of the mixed air according to the temperature at the inlet of the steam generator, solving the problem of poor adjustment accuracy in the prior art. At the same time, the circulation fan is controlled according to the air flow rate at the fan outlet, avoiding problems such as system overpressure or insufficient pressure rise caused by the mismatch between the fan pressure rise and the external air duct resistance.

[0077] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution. The order of execution of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0078] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A steam preparation system, characterized in that, Comprising: A heat storage body (1), a circulation fan (2), and a steam generator (3) connected through an air duct. A medium is introduced into the air duct. The air duct includes a circulation fan outlet air duct (4) connected to the outlet of the circulation fan (2), a heat storage body inlet air duct (5) connected to the inlet of the heat storage body (1), a heat storage body outlet air duct (6) connected to the outlet of the heat storage body (1), a steam generator inlet air duct (7) connected to the inlet of the steam generator (3), a steam generator outlet air duct (8) from the outlet of the steam generator (3) to the inlet of the circulation fan (2), and a bypass air duct (9). Among them, the circulation fan outlet air duct (4) is respectively connected to the heat storage body inlet air duct (5) and the bypass air duct (9), and the heat storage body outlet air duct (6) and the bypass air duct (9) are respectively connected to the steam generator inlet air duct (7); An adjusting device that uses the inlet air temperature of the steam generator (3) as a control signal is installed on the bypass air duct (9), and the rotation speed of the circulation fan (2) is controlled by the air flow rate at the outlet of the circulation fan outlet air duct (4).

2. The steam preparation system according to claim 1, wherein The adjusting device is a regulating valve (11) or a damper, and the opening degree of the regulating valve (11) or the damper is controlled according to the air temperature at the inlet of the steam generator (3) as a control signal.

3. The steam preparation system according to claim 1, characterized in that, A temperature sensor (10) communicatively connected to the adjusting device is provided on the steam generator inlet air duct (7).

4. The steam preparation system according to claim 1, wherein The circulation fan (2) is a variable-frequency fan, and the rotation speed of the variable-frequency fan is controlled according to the air flow rate at the outlet of the circulation fan outlet air duct (4).

5. The steam preparation system according to claim 1, characterized in that, A flow measurement device (12) communicatively connected to the circulation fan (2) is provided on the circulation fan outlet air duct (4).

6. The steam preparation system according to any one of claims 1 to 5, characterized in that The medium is air or an inert gas.

7. The steam preparation system according to any one of claims 1 to 5, characterized in that, The heat storage body (1) is a solid heat storage body, and the solid heat storage body adopts an operation mode of intermittent heat storage and continuous heat release or intermittent heat storage and intermittent heat release.

8. A control method for a steam preparation system according to any one of claims 1 to 7, characterized in that, Comprising: Measuring the inlet air temperature of the steam generator (3), and controlling the opening degree of the adjusting device according to the comparison result between the inlet air temperature of the steam generator and the temperature threshold; Measuring the air flow rate at the outlet of the circulation fan outlet air duct (4), and controlling the rotation speed of the circulation fan (2) according to the comparison result between the air flow rate and the flow threshold.

9. The control method of the steam preparation system according to claim 8, characterized in that, The adjusting device is a regulating valve (11) or a damper. Controlling the opening degree of the adjusting device according to the comparison result between the inlet air temperature of the steam generator and the temperature threshold includes: When the inlet air temperature of the steam generator (3) is greater than the temperature threshold, increasing the opening degree of the regulating valve (11) or the damper; When the inlet air temperature of the steam generator (3) is less than the temperature threshold, decreasing the opening degree of the regulating valve (11) or the damper.

10. The control method of the steam preparation system according to claim 9, characterized in that, The circulation fan (2) is a variable-frequency fan. Controlling the rotation speed of the circulation fan (2) according to the comparison result between the air flow rate and the flow threshold includes: When the air flow rate is greater than the flow threshold, decreasing the rotation speed of the variable-frequency fan; When the air flow rate is less than the flow threshold, increasing the rotation speed of the variable-frequency fan.

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