A double heat storage method based on hot steam closed cycle

Abstract

The present invention discloses a dual heat storage method based on a closed cycle of hot steam, which belongs to the field of energy storage technology, including establishing a dual heat storage system of a closed cycle of hot steam, formulating a cycle control strategy and a heat storage control strategy, dynamically adjusting the heat release mode from the boosting station ZYZ to the user end and the cycle heat storage between the flash tank SZ and the energy storage tank CN, solving the technical problems of efficient internal cycle heat storage between the energy storage tank and the flash tank, and dynamic balance between the user end heating demand and the system heat storage capacity. The present invention realizes heat interaction between the energy storage tank and the flash tank, improves the energy utilization rate of the heat storage system, ensures the priority satisfaction of the steam heating demand at the user end, takes into account the internal cycle heat storage, dynamically adjusts the start and stop logic of the micro-pressure station WYZ and the external hot water tank, realizes the coordinated work of multiple heat sources, and reduces heat loss and energy waste.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage, and in particular relates to a double heat storage method based on a hot steam closed cycle. Background Art

[0002] In the field of industrial steam heating and heat storage, the dual heat storage system can achieve efficient energy management and flexible scheduling by utilizing energy storage tanks and flash tanks. Traditional steam heating systems usually rely on a single heat storage medium or a single circulation mode, which cannot meet the needs of rapid heat response and long-term heat storage at the same time. In addition, the efficient use of industrial waste heat still faces challenges, especially in fluctuating load scenarios. How to dynamically allocate heat to ensure the stability of users' steam heating needs and reduce energy waste at the same time is an urgent problem to be solved.

[0003] Disadvantages of existing technology:

[0004] Traditional heat storage systems usually only store heat through energy storage tanks, which cannot respond quickly to large load changes and easily lead to heat waste.

[0005] Existing technologies mostly use fixed switching logic and lack the ability to dynamically adjust heat distribution between user needs and heat storage systems. Summary of the invention

[0006] The purpose of the present invention is to provide a dual heat storage method based on a closed cycle of hot steam, which solves the technical problems of efficient internal circulation heat storage between the energy storage tank and the flash tank, and the dynamic balance between the user-side heating demand and the system heat storage capacity.

[0007] To achieve the above object, the present invention adopts the following technical solution:

[0008] A dual heat storage method based on a hot steam closed cycle comprises the following steps:

[0009] Step 1: Establish a double heat storage system of hot steam closed cycle, including energy storage tank CN, circulating water pump WA, circulating water pump WB, micro-pressure station WYZ, flash tank SZ, make-up water pump WC, regulating valve V1, outlet valve V3, booster station ZYZ, outlet valve V2 and outlet valve V4; deploy three temperature sensors, namely sensor DS1, sensor DS2 and sensor DS3, at the outlet CC1 of energy storage tank CN to flash tank SZ, outlet ZA2 of booster station ZYZ and outlet of outlet valve V3, respectively, to collect the outlet water temperature T1 of energy storage tank CN, the outlet steam temperature T2 of booster station ZYZ and the steam heating temperature T3 of the user end, and sensors DS1, DS2 and DS3 send their collected temperature data to the central controller;

[0010] Step 2: The central controller obtains the outlet water temperature T1, sets a threshold value Tc, and formulates the heat storage control strategy of the micro-pressure station WYZ, the circulating water pump WA and the circulating water pump WB by judging whether T1 is lower than the threshold value Tc: Specifically, if T1 is lower than the threshold value Tc, the micro-pressure station WYZ starts; if T1 reaches the threshold value Tc, the micro-pressure station WYZ does not start; when T1 is still lower than the threshold value Tc after the micro-pressure station WYZ starts for a preset time, the circulating water pump WA and the circulating water pump WB are started, and the external water tank connected by the circulating water pump WA and the circulating water pump WB provides hot water storage for the energy storage tank CN circulation;

[0011] Step 3: The central controller obtains the steam outlet temperature T2 and the steam heating temperature T3, and sets the threshold value Ta of the steam heating temperature T3 and the threshold value Tb of the steam outlet temperature T2 according to the user's heating demand;

[0012] Determine whether the steam heating temperature T3 reaches the threshold value Ta or whether the steam outlet temperature T2 reaches the threshold value Tb, and formulate a circulation control strategy for the boosting station ZYZ, regulating valve V1, outlet valve V2, outlet valve V3 and outlet valve V4;

[0013] The circulation control strategy includes: when T2 reaches the threshold value Tb, the user-side heating load is increased by increasing the opening of the outlet valve V3 first; when the outlet valve V3 has been adjusted to the maximum opening and T2 reaches the threshold value Tb, the regulating valve V1 is opened to transfer the excess heat back to the energy storage tank CN for internal circulation heat storage. When T2 is less than the threshold value Tb, the regulating valve V1 remains closed and no internal circulation heat storage is performed; when T3 is less than the threshold value Ta, the regulating valve V1 is not opened, and the booster station ZYZ is opened to give priority to meeting the user's steam heating demand; when T3 reaches the threshold value Ta, the regulating valve V1 is opened, the heat distribution is adjusted through the internal circulation, and the load of the booster station ZYZ is increased, so that the booster station ZYZ maintains the current operating frequency;

[0014] Step 4: According to the circulation control strategy and heat storage control strategy, dynamically adjust the heat release mode from the booster station ZYZ to the user end and the circulation heat storage between the flash tank SZ and the energy storage tank CN.

[0015] Preferably, the dual heat storage system of the hot steam closed cycle is specifically as follows: the circulating water pump WA, the circulating water pump WB, the micro-pressure station WYZ, the flash tank SZ, the make-up pump WC, and the regulating valve V1 are all connected to the energy storage tank CN; the flash tank SZ is connected to the boosting station ZYZ through the outlet valve V2, the boosting station ZYZ supplies steam heating to the user end through the outlet valve V3, and the boosting station ZYZ is also connected to the regulating valve V1, so that an internal circulation heat storage is formed between the energy storage tank CN, the flash tank SZ and the boosting station ZYZ; the outlet valve V4 is used to control the pipeline passage from the energy storage tank CN to the flash tank SZ; the circulating water pump WA and the circulating water pump WB are used to connect to the external water tank.

[0016] Preferably, when executing step 2, the threshold value Tc is 120°C, and the control conditions of the micro-pressure station WYZ are as follows:

[0017] ;

[0018] Among them, the WYZ state is the opening or closing logic of the micro-pressure station WYZ, T1 is the outlet water temperature T1; when T1 reaches 120℃, the outlet valve V4 is opened;

[0019] The external hot water tank circulation provides hot water storage conditions as follows:

[0020] ;

[0021] Among them, WA state and WB state are the state logic of circulating water pump WA and circulating water pump WB respectively, tWYZ is the opening time of micro-pressure station WYZ, and tpreset is the preset time.

[0022] Preferably, when executing step 3, the threshold Tb is 160°C and the cycle control strategy is specifically:

[0023] When the booster station ZYZ is turned on, the outlet valve V2 is opened;

[0024] The control of booster station ZYZ, outlet valve V3 and regulating valve V1 is determined by T2 and T3:

[0025] ;

[0026] Among them, the opening of V3 is the control logic of the outlet valve V3. When steam heating is not needed for the user end, the outlet valve V3 is closed and the regulating valve V1 is opened;

[0027] ;

[0028] Among them, V1 opening is the control logic of outlet valve V1;

[0029] ;

[0030] The ZYZ working state is the working logic of booster station ZYZ.

[0031] The dual heat storage method based on the closed cycle of hot steam described in the present invention solves the technical problems of efficient internal circulation heat storage between the energy storage tank and the flash tank, and the dynamic balance between the user-end heating demand and the system heat storage capacity. The present invention realizes the heat interaction between the energy storage tank and the flash tank through dynamic control of each valve, improves the energy utilization rate of the heat storage system, and ensures the priority of the user-end steam heating demand by controlling the working state of the booster station ZYZ. At the same time, the internal circulation heat storage is taken into account. According to the changes in the real-time temperatures T1, T2, and T3, the start and stop logic of the micro-pressure station WYZ and the external hot water tank are dynamically adjusted to realize the coordinated work of multiple heat sources, reduce heat loss and energy waste, make full use of industrial waste heat, and provide a cost-effective solution for user steam heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the process flow of the double heat storage system of the hot steam closed cycle of the present invention;

[0033] Figure 2 It is the main flow chart of the present invention. DETAILED DESCRIPTION

[0034] Depend on Figure 1-Figure 2 A dual heat storage method based on a hot steam closed cycle is shown, comprising the following steps:

[0035] Step 1: Establish a double heat storage system of hot steam closed cycle, including energy storage tank CN, circulating water pump WA, circulating water pump WB, micro-pressure station WYZ, flash tank SZ, make-up water pump WC, regulating valve V1, outlet valve V3, booster station ZYZ, outlet valve V2 and outlet valve V4; deploy three temperature sensors, namely sensor DS1, sensor DS2 and sensor DS3, at the outlet CC1 of energy storage tank CN to flash tank SZ, outlet ZA2 of booster station ZYZ and outlet of outlet valve V3, respectively, to collect the outlet water temperature T1 of energy storage tank CN, the outlet steam temperature T2 of booster station ZYZ and the steam heating temperature T3 of the user end, and sensors DS1, DS2 and DS3 send their collected temperature data to the central controller;

[0036] The dual heat storage system of the hot steam closed cycle is specifically as follows: the circulating water pump WA, the circulating water pump WB, the micro-pressure station WYZ, the flash tank SZ, the make-up water pump WC, and the regulating valve V1 are all connected to the energy storage tank CN; the flash tank SZ is connected to the boosting station ZYZ through the outlet valve V2, the boosting station ZYZ supplies steam heating to the user end through the outlet valve V3, and the boosting station ZYZ is also connected to the regulating valve V1, so that an internal circulation heat storage is formed between the energy storage tank CN, the flash tank SZ and the boosting station ZYZ; the outlet valve V4 is used to control the pipeline passage from the energy storage tank CN to the flash tank SZ; the circulating water pump WA and the circulating water pump WB are used to connect to the external water tank.

[0037] In this embodiment, the circulating water inlet and outlet of the energy storage tank CN include circulating water inlet CA1 and circulating water inlet CA2, circulating water inlet CB1 and circulating water inlet CB2, circulating water inlet CD1, water recovery inlet CC2, water replenishment inlet CE1, and water outlet CC1;

[0038] The circulating water inlet CA1 and the circulating water inlet CA2 are a pair of water inlets and outlets, and the circulating water inlet CB1 and the circulating water inlet CB2 are a pair of water inlets and outlets;

[0039] The circulating water pump WA and the circulating water pump WB are respectively connected to the circulating water inlet CA1 and the circulating water inlet CA2 of the energy storage tank CN through two pipelines;

[0040] The hot water circulation inlet and outlet of the micro-pressure station WYZ include the circulation water inlet WA1 and the circulation water inlet WA2, which are respectively connected to the circulation water inlet CB1 and the circulation water inlet CB2 of the energy storage tank CN through two pipes;

[0041] The water outlet CC1 of the energy storage tank CN is connected to the spray interface SA1 of the flash tank SZ through a pipeline, and the pipeline is provided with an outlet valve V4;

[0042] The water circulation outlet SA2 of the flash tank SZ is connected to the water recovery inlet CC2 of the energy storage tank CN through a pipeline, so as to recover the water in the flash tank SZ.

[0043] The steam outlet SB1 of the flash tank SZ is connected to the inlet ZA1 of the booster station ZYZ through a pipeline, and the pipeline is also provided with an outlet valve V2;

[0044] The outlet ZA2 of the booster station ZYZ is connected to the outlet valve V3 that controls the steam heating at the user end through a pipeline, and the pipeline is also connected to the regulating valve V1;

[0045] The regulating valve V1 is connected to the circulating water inlet CD1 of the energy storage tank through a pipeline;

[0046] The outlet valve V3 supplies steam heating to the user through a pipeline;

[0047] The water supply pump WC is connected to the water supply port CE1 through a pipe;

[0048] The compression station WYZ itself is a heat exchange station, which controls the heat exchange through a heat pump;

[0049] The water circulation port of the micro-pressure station WYZ for external heat exchange includes an interface WB1 and an interface WB2, and the interface WB1 and the interface WB2 are connected to an external water tank for storing industrial preheating.

[0050] After the industrial preheating heat is exchanged in the micro-pressure station WYZ, the heat energy is transferred to the water in the circulating water circuit where the circulating water inlets WA1 and WA2 are located, and then sent to the water tank of the energy storage tank CN;

[0051] When the water in the energy storage tank CN reaches a certain temperature, such as 120 degrees, the water in the energy storage tank CN is transported to the spray interface SA1 of the flash tank SZ through the water outlet CC1, so that the water is sprayed in the flash tank SZ to form steam;

[0052] Water will appear in the flash tank SZ during the process of forming steam, and this water will be recycled to the water recovery inlet CC2 of the energy storage tank CN through the water circulation outlet SA2, thus forming a water recovery path;

[0053] The steam in the flash tank SZ will be output from the steam outlet SB1 to the booster station ZYZ, enter from the inlet ZA1 of the booster station ZYZ, and then be pressurized by the booster station ZYZ before being output from the outlet ZA2. The output pressurized steam will provide steam heating to users through the outlet valve V3;

[0054] While supplying steam to the user, when the user's steam heating temperature reaches the preset temperature, it should be considered that the user's steam heating is in excess, and the excess energy needs to be recovered. Therefore, the pressurized steam output from the outlet ZA2 will also be transported to the regulating valve V1 through the pipeline, and recovered through the regulating valve V1 to the circulating water inlet CD1 of the energy storage tank CN, thereby recovering the heat back to the energy storage tank;

[0055] The circulating water inlet WA1 and the circulating water inlet WA2 are connected to an external hot water tank, and are used to heat and store energy in the energy storage tank of the energy storage tank in another way.

[0056] Step 2: The central controller obtains the outlet water temperature T1, sets a threshold value Tc, and formulates the heat storage control strategy of the micro-pressure station WYZ, the circulating water pump WA and the circulating water pump WB by judging whether T1 is lower than the threshold value Tc: Specifically, if T1 is lower than the threshold value Tc, the micro-pressure station WYZ starts; if T1 reaches the threshold value Tc, the micro-pressure station WYZ does not start; when T1 is still lower than the threshold value Tc after the micro-pressure station WYZ starts for a preset time, the circulating water pump WA and the circulating water pump WB are started, and the external water tank connected by the circulating water pump WA and the circulating water pump WB provides hot water storage for the energy storage tank CN circulation;

[0057] The threshold value Tc is 120℃, and the control conditions of the micro-pressure station WYZ are as follows:

[0058] ;

[0059] Among them, the WYZ state is the opening or closing logic of the micro-pressure station WYZ, T1 is the outlet water temperature T1; when T1 reaches 120℃, the outlet valve V4 is opened;

[0060] The external hot water tank circulation provides hot water storage conditions as follows:

[0061] ;

[0062] Among them, WA state and WB state are the state logic of circulating water pump WA and circulating water pump WB respectively, tWYZ is the opening time of micro-pressure station WYZ, and tpreset is the preset time.

[0063] The control strategy of the micro-pressure station WYZ in this embodiment is:

[0064] When T1 is less than 120℃, the micro-pressure station WYZ will work. At this time, if the temperature of the micro-pressure station WYZ still does not reach 120℃ after the preset working time, the circulating water pump WA and the circulating water pump WB will be turned on, and the external hot water tank will be used to supplement the heating. Otherwise, the circulating water pump WA and the circulating water pump WB will not be turned on. When T1 is greater than or equal to 120℃, the micro-pressure station WYZ will be turned off.

[0065] The function of the micro-pressure station WYZ is to raise the temperature in the energy storage tank CN to 120°C through industrial preheating, and then send it to the flash tank SZ to generate steam.

[0066] Step 3: The central controller obtains the steam outlet temperature T2 and the steam heating temperature T3, and sets the threshold value Ta of the steam heating temperature T3 and the threshold value Tb of the steam outlet temperature T2 according to the user's heating demand;

[0067] Determine whether the steam heating temperature T3 reaches the threshold value Ta or whether the steam outlet temperature T2 reaches the threshold value Tb, and formulate a circulation control strategy for the boosting station ZYZ, regulating valve V1, outlet valve V2, outlet valve V3 and outlet valve V4;

[0068] The circulation control strategy includes: when T2 reaches the threshold value Tb, the user-side heating load is increased by increasing the opening of the outlet valve V3 first; when the outlet valve V3 has been adjusted to the maximum opening and T2 reaches the threshold value Tb, the regulating valve V1 is opened to transfer the excess heat back to the energy storage tank CN for internal circulation heat storage. When T2 is less than the threshold value Tb, the regulating valve V1 remains closed and no internal circulation heat storage is performed; when T3 is less than the threshold value Ta, the regulating valve V1 is not opened, and the booster station ZYZ is opened to give priority to meeting the user's steam heating demand; when T3 reaches the threshold value Ta, the regulating valve V1 is opened, the heat distribution is adjusted through the internal circulation, and the load of the booster station ZYZ is increased, so that the booster station ZYZ maintains the current operating frequency;

[0069] The specific cycle control strategy when the threshold Tb is 160℃ is:

[0070] When the booster station ZYZ is turned on, the outlet valve V2 is opened;

[0071] The control of booster station ZYZ, outlet valve V3 and regulating valve V1 is determined by T2 and T3:

[0072] ;

[0073] Among them, the opening of V3 is the control logic of the outlet valve V3. When steam heating is not needed for the user end, the outlet valve V3 is closed and the regulating valve V1 is opened;

[0074] ;

[0075] Among them, V1 opening is the control logic of outlet valve V1;

[0076] ;

[0077] The ZYZ working state is the working logic of booster station ZYZ.

[0078] The loop control strategy in this embodiment is:

[0079] T2 is normally 160 degrees. When T2 is greater than 160 degrees, heat is released. There are two ways to release heat: the first is to increase the consumption of the user's heating end by adjusting the outlet valve V3, that is, to increase the user's heating load. The other is to open the regulating valve V1 after the outlet valve V3 is adjusted to the maximum, when T2 is still greater than 160 degrees, so that the temperature of T2 is kept at 160 degrees, realizing an internal circulation heat storage.

[0080] When T2 is less than 160 degrees, the regulating valve V1 is not opened, that is, the internal circulation heat storage is not performed.

[0081] For T3, a heating threshold Ta needs to be preset. The heating threshold Ta represents the minimum required temperature for heating. Ta is not necessarily equal to 160 degrees, but may be lower than 160 degrees.

[0082] When T3 is less than Ta, the regulating valve V1 will not be opened. At this time, the heating temperature is lower than the required temperature. At this time, the working frequency of the booster station ZYZ will not decrease, and will be maintained at a preset high-frequency working state, which is the desired state;

[0083] When T3 is greater than Ta, the temperature at this time is higher than the required temperature. At this time, the frequency of the booster station ZYZ may be reduced or even closed due to the reduced compliance. At this time, it is necessary to open the regulating valve V1. By opening the regulating valve V1, the internal circulation heat storage is turned on, which increases the pressure and the load of the booster station ZYZ. This makes the booster station ZYZ work in a high-frequency working state and reduces the frequency of frequent starting of the compressor in the booster station ZYZ.

[0084] Step 4: According to the circulation control strategy and heat storage control strategy, dynamically adjust the heat release mode from the booster station ZYZ to the user end and the circulation heat storage between the flash tank SZ and the energy storage tank CN.

[0085] The dual heat storage method based on the closed cycle of hot steam described in the present invention solves the technical problems of efficient internal circulation heat storage between the energy storage tank and the flash tank, and the dynamic balance between the user-end heating demand and the system heat storage capacity. The present invention realizes the heat interaction between the energy storage tank and the flash tank through dynamic control of each valve, improves the energy utilization rate of the heat storage system, and ensures the priority of the user-end steam heating demand by controlling the working state of the booster station ZYZ. At the same time, the internal circulation heat storage is taken into account. According to the changes in the real-time temperatures T1, T2, and T3, the start and stop logic of the micro-pressure station WYZ and the external hot water tank are dynamically adjusted to realize the coordinated work of multiple heat sources, reduce heat loss and energy waste, make full use of industrial waste heat, and provide a cost-effective solution for user steam heating.

Claims

1. A dual heat storage method based on a hot steam closed cycle, characterized in that: The steps include: Step 1: Establish a double heat storage system of hot steam closed cycle, including energy storage tank CN, circulating water pump WA, circulating water pump WB, micro-pressure station WYZ, flash tank SZ, make-up water pump WC, regulating valve V1, outlet valve V3, booster station ZYZ, outlet valve V2 and outlet valve V4; deploy three temperature sensors, namely sensor DS1, sensor DS2 and sensor DS3, at the outlet CC1 of energy storage tank CN to flash tank SZ, outlet ZA2 of booster station ZYZ and outlet of outlet valve V3, respectively, to collect the outlet water temperature T1 of energy storage tank CN, the outlet steam temperature T2 of booster station ZYZ and the steam heating temperature T3 of the user end, and sensors DS1, DS2 and DS3 send their collected temperature data to the central controller respectively; The double heat storage system of the hot steam closed cycle is specifically as follows: the circulating water pump WA, the circulating water pump WB, the micro-pressure station WYZ, the flash tank SZ, the water supply pump WC, and the regulating valve V1 are all connected to the energy storage tank CN; the flash tank SZ is connected to the boosting station ZYZ through the outlet valve V2, the boosting station ZYZ supplies steam heating to the user end through the outlet valve V3, and the boosting station ZYZ is also connected to the regulating valve V1, so that an internal circulation heat storage is formed between the energy storage tank CN, the flash tank SZ and the boosting station ZYZ; the outlet valve V4 is used to control the pipeline passage from the energy storage tank CN to the flash tank SZ; the circulating water pump WA and the circulating water pump WB are used to connect to the external water tank; Step 2: The central controller obtains the outlet water temperature T1, sets a threshold value Tc, and formulates the heat storage control strategy of the micro-pressure station WYZ, the circulating water pump WA, and the circulating water pump WB by judging whether T1 is lower than the threshold value Tc: Specifically, if T1 is lower than the threshold value Tc, the micro-pressure station WYZ is started; When T1 reaches the threshold value Tc, the micro-pressure station WYZ will not start; when T1 is still lower than the threshold value Tc after the micro-pressure station WYZ starts for a preset time, the circulating water pump WA and the circulating water pump WB will be started, and the external water tank connected by the circulating water pump WA and the circulating water pump WB will provide hot water storage for the energy storage tank CN circulation; Step 3: The central controller obtains the steam outlet temperature T2 and the steam heating temperature T3, and sets the threshold value Ta of the steam heating temperature T3 and the threshold value Tb of the steam outlet temperature T2 according to the user's heating demand; Determine whether the steam heating temperature T3 reaches the threshold value Ta or whether the steam outlet temperature T2 reaches the threshold value Tb, and formulate a circulation control strategy for the boosting station ZYZ, regulating valve V1, outlet valve V2, outlet valve V3 and outlet valve V4; The cycle control strategy includes increasing the user-side heating load by increasing the opening of the outlet valve V3 first when T2 reaches the threshold value Tb; when the outlet valve V3 has been adjusted to the maximum opening and T2 reaches the threshold value When T2 is less than the threshold value Tb, the regulating valve V1 is opened to transfer the excess heat back to the energy storage tank CN for internal circulation heat storage. When T2 is less than the threshold value Tb, the regulating valve V1 remains closed and no internal circulation heat storage is performed. When T3 is less than the threshold value Ta, the regulating valve V1 is not opened, and the booster station ZYZ is opened to give priority to meeting the user's steam heating demand; when T3 is greater than or equal to Ta, and T2 is greater than or equal to Tb, and the opening of V3 has been adjusted to the maximum, the regulating valve V1 is opened, and the heat distribution is adjusted through the internal circulation and the load of the booster station ZYZ is increased, so that the booster station ZYZ maintains the current operating frequency; Step 4: According to the circulation control strategy and heat storage control strategy, dynamically adjust the heat release mode from the booster station ZYZ to the user end and the circulation heat storage between the flash tank SZ and the energy storage tank CN.

2. A dual heat storage method based on a hot steam closed cycle as claimed in claim 1, characterized in that: When executing step 2, the threshold value Tc is 120°C, and the control conditions of the micro-pressure station WYZ are as follows: Among them, WYZ 状态 It is the opening or closing logic of the micro pressure station WYZ, and T1 is the outlet water temperature T1; when T1 reaches 120°C, open the outlet valve V4; The external hot water tank circulation provides hot water storage conditions as follows: Among them, WA 状态 and W.B. 状态 They are the state logic of circulating water pump WA and circulating water pump WB, t WYZ is the opening time of the micro-pressure station WYZ, t 预设 is the preset time.

3. A dual heat storage method based on a hot steam closed cycle as claimed in claim 2, characterized in that: When executing step 3, the threshold Tb is 160°C and the cycle control strategy is as follows: When the booster station ZYZ is turned on, the outlet valve V2 is opened; The control of booster station ZYZ, outlet valve V3 and regulating valve V1 is determined by T2 and T3: Among them, V3 开度 This is the control logic of the outlet valve V3. When steam heating is not required for the user end, the outlet valve V3 is closed and the regulating valve V1 is opened; Among them, V1 开度 It is the control logic of outlet valve V1; ZYZ 工作状态 This is the working logic of booster station ZYZ.

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