A method for configuring a thermal storage tank

Abstract

The application discloses a heat storage tank capacity configuration method, comprising the following steps: S1, designing a heat storage tank capacity selection method; S2, judging whether a heat storage tank scheme is applicable, if applicable, then performing step S3; S3, determining a heat storage tank preliminary design heat storage total amount, and obtaining a heat storage tank preliminary design capacity; S4, increasing a heat network heat storage amount, and calculating a heat storage tank increased heat supply total amount and a heat network increased heat supply total amount; S5, reducing the heat network increased heat supply total amount in the heat storage tank preliminary design heat storage total amount, obtaining a heat storage tank design heat storage total amount, and further obtaining a heat storage tank design capacity; and S6, calculating a capacity of a heat storage tank reduced part. The application can reduce the capacity in the heat storage tank preliminary selection stage, solves the problem of heat storage tank project capacity selection overestimation, and solves the problems of high heat storage tank investment and long return period.

Description

Technical Field

[0001] This invention relates to the field of thermal storage tank technology, and more specifically to a method for configuring the capacity of a thermal storage tank. Background Technology

[0002] Thermal storage tank technology is one of the important research directions in the "three-in-one" transformation of thermal power units, focusing on thermal-electric decoupling. Under the premise of achieving a peak-shaving capacity of 40% of rated load with a minimum daily 6-hour power output and meeting the external grid heating demand, rationally configuring the capacity of thermal storage tanks in conjunction with operational strategies is of great significance for effectively reducing the investment in thermal-electric decoupling retrofits and promoting the application of thermal storage tank technology. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method for configuring the capacity of thermal storage tanks, which can reduce the capacity in the initial selection stage of thermal storage tanks, solve the problem of over-selection of capacity in thermal storage tank projects, and thus solve the problems of high investment and long payback period of thermal storage tanks.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows.

[0005] A method for configuring the capacity of a thermal storage tank includes the following steps: S1. Design method for selecting the capacity of thermal storage tank; S2. Determine if the thermal storage tank solution is applicable. If applicable, proceed to step S3. S3. Determine the total heat storage capacity of the heat storage tank in the preliminary design and obtain the preliminary design capacity of the heat storage tank; S4. Increase the heat storage capacity of the heating network, and calculate the total increase in heat supply from the heat storage tank and the total increase in heat supply from the heating network; S5. Subtract the increased total heating supply from the heat network from the initial design total heat storage of the heat storage tank to obtain the design total heat storage of the heat storage tank, and then obtain the design capacity of the heat storage tank. S6. Calculate the capacity of the reduced portion of the thermal storage tank.

[0006] Preferably, the method for selecting the capacity of the thermal storage tank designed in step S1 is as follows: According to the formula for heat absorption and release in heating networks and auxiliary systems: in, —Heat absorption / release; —Specific heat; —Mass flow rate of heating network water in the thermal storage tank; —Water supply temperature; —Return water temperature; Ignoring heat loss from the thermal storage tank itself, the design capacity of the thermal storage tank is: in, —Design capacity of the thermal storage tank; —The total heat storage capacity of the heat storage tank.

[0007] Preferably, step S2, determining whether the thermal storage tank solution is applicable, includes the following steps: S21. The daily heat demand of the heating network includes 18 hours of non-deep adjustment time and 6 hours of deep adjustment time. According to the heating network statistics of previous years, the average daily total heat supply from the heating units to the heating network is: in, —Average daily heating supply; —Heating supply during non-deep adjustment periods; —Heating supply during the deep adjustment period; S22. When the average daily heating supply from the heating unit to the heating network exceeds the designed heating supply of the heating network, the thermal storage tank scheme is applicable, i.e.: in, —The total designed heating capacity of the heating network.

[0008] Preferably, step S3 specifically includes the following steps: S31. Calculate the preliminary design heat storage capacity of the heat storage tank based on the total designed heating capacity of the heating network and the heat supply gap during the deep adjustment period: in, —Preliminary design of the thermal storage tank's total thermal storage capacity; S32. Substitute the total heat storage capacity of the thermal storage tank into step S1 to obtain the preliminary design capacity of the thermal storage tank: in, —Preliminary design capacity of the thermal storage tank.

[0009] Preferably, step S4 uses the initially designed water supply temperature of the thermal storage tank. and return water temperature As a characteristic variable, the strategy of increasing the supply water temperature of the heat storage tank while keeping the return water temperature unchanged is adopted to increase the heat storage capacity of the heating network: Step S4 specifically includes the following steps: S41. Determine the increased water supply temperature of the thermal storage tank. ,when At that time, the water supply temperature of the thermal storage tank was initially designed. and return water temperature As a characteristic variable, the strategy of increasing the supply water temperature of the heat storage tank while keeping the return water temperature unchanged is adopted to increase the heat storage capacity of the heating network. S42. Calculate the total increase in heat supply after the thermal storage tank adopts the temperature increase strategy: in, —Increased water supply temperature to the thermal storage tank; —Increased water supply temperature to the thermal storage tank; —The increase in total heating capacity after the thermal storage tank adopts a temperature-raising strategy; S43. Calculate the increase in total heating supply after the heating network adopts the temperature increase strategy: in, —The increase in total heating supply after the heating network adopts a temperature-raising strategy; —The mass flow rate of heating network water in the heating network storage unit. = , This refers to the heat storage volume of the heat storage unit in the heating network.

[0010] Preferably, the specific method of step S5 is as follows: The increased heating supply from the heating network is deducted from the initial design total heat storage capacity of the thermal storage tank to obtain the designed total heat storage capacity of the thermal storage tank: in, —Total heat storage capacity of the thermal storage tank; Then calculate the design capacity of the thermal storage tank: in, —Design capacity of the thermal storage tank; Substituting the total increase in heat supply from the thermal storage tank after adopting the temperature-raising strategy, calculated in steps S42 and S43, and the total increase in heat supply from the heating network after adopting the temperature-raising strategy, into the formula for calculating the design capacity of the thermal storage tank, we obtain: .

[0011] Preferably, the capacity reduction of the thermal storage tank in step S6 is the preliminary design capacity of the thermal storage tank minus the design capacity of the thermal storage tank, that is: in, —Reduced capacity of thermal storage tanks.

[0012] Due to the adoption of the above technical solutions, the technical progress achieved by this invention is as follows.

[0013] This invention achieves peak-shaving capacity of 40% of rated load in 6 hours per day while meeting the heating demand of the external grid. It utilizes the thermal storage capacity of water and the strategy of increasing the upper limit of thermal storage units in the heating network. That is, it increases energy storage capacity while effectively reducing the capacity configuration of thermal storage tanks. This allows the capacity to be reduced in the initial selection stage of thermal storage tanks, solving the problem of over-selection of capacity in thermal storage tank projects, and thus solving the problems of high investment and long payback period of thermal storage tanks. Attached Figure Description

[0014] Figure 1 This is a flowchart of the present invention. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] A method for configuring the capacity of a thermal storage tank, combined with Figure 1 As shown, it includes the following steps: S1. Design method for selecting the capacity of the thermal storage tank.

[0017] Based on the heat absorption and release formulas in the heating network and its auxiliary systems, and ignoring the heat loss of the heat storage tank itself, the design capacity of the heat storage tank is obtained.

[0018] The amount of heat absorbed and released in heating networks and auxiliary systems can be expressed by the following formula: in, —Heat absorption / release; —Specific heat; —Mass flow rate of heating network water in the thermal storage tank; —Water supply temperature; —Return water temperature; Ignoring heat loss from the storage tank itself, the total heat storage capacity of the storage tank is equal to the heat absorbed / released by the heating network. The water storage capacity of the storage tank, i.e., its design capacity, can be obtained from the following formula: in, —Design capacity of the thermal storage tank; —The total heat storage capacity of the heat storage tank.

[0019] S2. Determine whether the thermal storage tank solution is applicable.

[0020] The heating units provide the heat required by the heating network. The suitability of the thermal storage tank scheme is determined by whether the average daily total heat supply from the heating units to the heating network exceeds the designed total heat supply of the network. Specifically, this includes the following steps: S21. The daily heat demand of the heating network includes 18 hours of non-deep adjustment time and 6 hours of deep adjustment time. Based on the heating network supply statistics of previous years, the average daily total heat supply from the heating units to the heating network is calculated as follows: in, —Average daily heating supply; —Heating supply during non-deep adjustment periods; —Heating supply during the deep adjustment period.

[0021] S22. Determine whether the average daily heating supply from the heating unit to the heating network exceeds the designed heating supply of the heating network. The thermal storage tank scheme is applicable when the average daily heating supply from the heating unit to the heating network exceeds the designed heating supply of the heating network. in, —The total designed heating capacity of the heating network.

[0022] S3. Determine the total heat storage capacity of the heat storage tank in the preliminary design and obtain the preliminary design capacity of the heat storage tank.

[0023] The specific method is as follows: S31. Calculate the preliminary design heat storage capacity of the heat storage tank based on the total designed heating capacity of the heating network and the heat supply gap during the deep adjustment period: in, —The preliminary design of the thermal storage tank has a total thermal storage capacity.

[0024] S32. Substitute the total heat storage capacity of the thermal storage tank into step S1 to obtain the preliminary design capacity of the thermal storage tank: in, —Preliminary design capacity of the thermal storage tank.

[0025] S4. Increase the heat storage capacity of the heating network and calculate the total increase in heat supply from the heat storage tank and the heating network.

[0026] By employing a thermal power turbine, the upper limit of energy storage per unit volume of the thermal storage tank is increased, i.e., based on the initially designed water supply temperature of the thermal storage tank. and return water temperature As a characteristic variable, a strategy is adopted to increase the supply water temperature of the thermal storage tank while keeping the return water temperature constant. The increased supply water temperature of the thermal storage tank is: The increased supply water temperature of the heating network is the same as the increased supply water temperature of the thermal storage tank. With the return water temperature remaining constant, the heat storage capacity of the heating network can be increased. Furthermore, the thermal storage tanks include unpressurized and pressurized tanks. The upper temperature limits that can be increased for unpressurized and pressurized tanks are as follows: =98℃, =120℃, only In such cases, a strategy of increasing the upper limit of the thermal storage tank can be adopted.

[0027] Step S4 includes the following specific steps: S41. Determine the increased water supply temperature of the thermal storage tank. ,when At that time, the water supply temperature of the thermal storage tank was initially designed. and return water temperature As a characteristic variable, the strategy of increasing the supply water temperature of the heat storage tank while keeping the return water temperature unchanged is adopted to increase the heat storage capacity of the heating network.

[0028] S42. Calculate the total increase in heat supply after the thermal storage tank adopts the temperature increase strategy: in, —Increased water supply temperature to the thermal storage tank; —Increased water supply temperature to the thermal storage tank; —The increase in total heating capacity after the thermal storage tank adopts a temperature-raising strategy.

[0029] S43. Calculate the increase in total heating supply after the heating network adopts the temperature increase strategy: in, —The increase in total heating supply after the heating network adopts a temperature-raising strategy; —The mass flow rate of heating network water in the heating network storage unit. = , This refers to the heat storage volume of the heat storage unit in the heating network.

[0030] S5. Subtract the increased total heating supply from the heat network from the initial design total heat storage of the heat storage tank to obtain the design total heat storage of the heat storage tank, and then obtain the design capacity of the heat storage tank.

[0031] After adopting the temperature-raising strategy in step S4, the increased total heating supply of the heating network is deducted from the preliminary design total heat storage of the heat storage tank to obtain the design total heat storage of the heat storage tank: in, —The total heat storage capacity of the heat storage tank.

[0032] Then calculate the design capacity of the thermal storage tank: in, —Design capacity of the thermal storage tank.

[0033] Substituting the total increase in heat supply from the thermal storage tank after adopting the temperature-raising strategy, calculated in steps S42 and S43, and the total increase in heat supply from the heating network after adopting the temperature-raising strategy, into the formula for calculating the design capacity of the thermal storage tank, we obtain: 。

[0034] S6. Calculate the capacity of the reduced portion of the thermal storage tank.

[0035] The reduced capacity of the thermal storage tank is the initial design capacity minus the design capacity of the thermal storage tank, i.e.: in, —Reduced capacity of thermal storage tanks.

[0036] In the selection of thermal storage tank schemes, the thermal storage volume of the thermal network storage unit is... It is a fixed value, that is, when The design of the thermal storage tank capacity can reduce .

[0037] This invention achieves peak-shaving capacity of 40% of rated load in 6 hours per day while meeting the heating demand of the external grid. It utilizes the thermal storage capacity of water and the strategy of increasing the upper limit of thermal storage units in the heating network. That is, it increases energy storage capacity while effectively reducing the capacity configuration of thermal storage tanks. This allows the capacity to be reduced in the initial selection stage of thermal storage tanks, solving the problem of over-selection of capacity in thermal storage tank projects, and thus solving the problems of high investment and long payback period of thermal storage tanks.

Claims

1. A method of configuring the capacity of a thermal storage tank, characterized by: Includes the following steps: S1. Design method for selecting the capacity of thermal storage tank; S2. Determine if the thermal storage tank solution is applicable. If applicable, proceed to step S3. Step S2, determining whether the thermal storage tank solution is applicable, includes the following steps: S21. The daily heat demand of the heating network includes 18 hours of non-deep adjustment time and 6 hours of deep adjustment time. According to the heating network statistics of previous years, the average daily total heat supply from the heating units to the heating network is: wherein, - total daily heat supply; — non-deep modulation period heat supply amount; —Heating supply during the deep adjustment period; S22. When the average daily heating supply from the heating unit to the heating network exceeds the designed heating supply of the heating network, the thermal storage tank scheme is applicable, i.e.: in, —Total heating capacity designed for the heating network; S3. Determine the total heat storage capacity of the heat storage tank in the preliminary design and obtain the preliminary design capacity of the heat storage tank; Step S3 specifically includes the following steps: S31. Calculate the preliminary design heat storage capacity of the heat storage tank based on the total designed heating capacity of the heating network and the heat supply gap during the deep adjustment period: in, —Preliminary design of the thermal storage tank's total thermal storage capacity; S32. Substitute the total heat storage capacity of the thermal storage tank into step S1 to obtain the preliminary design capacity of the thermal storage tank: in, —Preliminary design capacity of the thermal storage tank; —Specific heat; S4. Increase the heat storage capacity of the heating network, and calculate the total increase in heat supply from the heat storage tank and the total increase in heat supply from the heating network; Step S4 uses the pre-designed water supply temperature of the thermal storage tank. and return water temperature As a characteristic variable, the strategy of increasing the supply water temperature of the heat storage tank while keeping the return water temperature unchanged is adopted to increase the heat storage capacity of the heating network: Step S4 specifically includes the following steps: S41. Determine the increased water supply temperature of the thermal storage tank. ,when At that time, the water supply temperature of the thermal storage tank was initially designed. and return water temperature As a characteristic variable, the strategy of increasing the supply water temperature of the heat storage tank while keeping the return water temperature unchanged is adopted to increase the heat storage capacity of the heating network. S42. Calculate the total increase in heat supply after the thermal storage tank adopts the temperature increase strategy: in, —Increased water supply temperature to the thermal storage tank; —Increased water supply temperature to the thermal storage tank; —The increase in total heating capacity after the thermal storage tank adopts a temperature-raising strategy; S43. Calculate the total increase in heating supply after the heating network adopts the temperature increase strategy: in, —The increase in total heating supply after the heating network adopts a temperature-raising strategy; —The mass flow rate of heating network water in the heating network storage unit. = , This refers to the heat storage volume of the heat storage unit in the heating network; S5. Subtract the increased total heating supply from the heat network from the initial design total heat storage of the heat storage tank to obtain the design total heat storage of the heat storage tank, and then obtain the design capacity of the heat storage tank. The specific method for step S5 is as follows: The increased heating supply from the heating network is deducted from the initial design total heat storage capacity of the thermal storage tank to obtain the designed total heat storage capacity of the thermal storage tank: in, —Total heat storage capacity of the thermal storage tank; Then calculate the design capacity of the thermal storage tank: in, —Design capacity of the thermal storage tank; Substituting the total increase in heat supply from the thermal storage tank after adopting the temperature-raising strategy, calculated in steps S42 and S43, and the total increase in heat supply from the heating network after adopting the temperature-raising strategy, into the formula for calculating the design capacity of the thermal storage tank, we obtain: S6. Calculate the capacity of the reduced portion of the thermal storage tank.

2. The method for configuring the capacity of a thermal storage tank according to claim 1, characterized in that: The specific method for selecting the capacity of the thermal storage tank designed in step S1 is as follows: According to the formula for heat absorption and release in heating networks and auxiliary systems: in, —Heat absorption / release; —Mass flow rate of heating network water in the thermal storage tank; —Water supply temperature; —Return water temperature; Ignoring heat loss from the thermal storage tank itself, the design capacity of the thermal storage tank is: in, —Design capacity of the thermal storage tank; —The total heat storage capacity of the heat storage tank.

3. The method for configuring the capacity of a thermal storage tank according to claim 1, characterized in that: The capacity reduction of the thermal storage tank in step S6 is the initial design capacity of the thermal storage tank minus the design capacity of the thermal storage tank, that is: in, —Reduced capacity of thermal storage tanks.

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