Annular solid heat storage system and using method thereof

Abstract

The invention discloses an annular solid heat storage system and a using method thereof.The annular solid heat storage system comprises an annular pipeline, n solid heat storage modules are evenly connected to the annular pipeline in series, and n is larger than or equal to 2; valves are arranged on the two sides of each solid heat storage module; n water collecting bypass pipelines are connected to the water collector in parallel, and each water collecting bypass pipeline is connected to the position, located between every two adjacent solid heat storage modules, of the annular pipeline; each water collection bypass pipeline is provided with a valve for controlling the on-off of the water collection bypass pipeline; n water distribution bypass pipelines are connected to the water distributor in parallel, and each water distribution bypass pipeline is connected to the position, located between every two adjacent solid heat storage modules, of the annular pipeline; and each water diversion bypass pipeline is provided with a valve for controlling the on-off of the water diversion bypass pipeline. The problem that an existing solid heat storage system is poor in adaptability to application scenes with unstable load changes is solved.

Description

[Technical field]

[0001] The present invention belongs to the technical field of thermal energy utilization, and in particular relates to an annular solid heat storage system and a method of using the same. [Background technology]

[0002] In the technical system of efficient energy utilization and conversion, heat storage devices, as a key link, can achieve efficient energy storage and release and maintain stable operation of the system by relying on stable heat energy input and output under conditions of stable energy supply. However, in application scenarios such as solar thermal conversion and industrial waste heat recovery, the heat source is restricted by factors such as the natural environment and the intermittent nature of the production process, and its stability is poor, showing a strong time fluctuation characteristic. This fluctuation directly interferes with the heat exchange process of the heat exchange fluid in the collector tube, causing its inlet and outlet temperatures to fluctuate greatly. According to the principles of thermodynamics and heat transfer, the instability of the heat exchange fluid temperature will disrupt the internal energy balance of the system, thereby significantly reducing the system's power generation efficiency, while destroying the stability of the system's operation and affecting the reliability of energy supply.

[0003] In view of this, developing a solid heat storage system that is highly adaptable to unstable load changes, optimizing the performance of heat storage materials, innovating the design of heat storage structures, and enhancing the system's adaptability to fluctuating heat sources are of great significance to improving the comprehensive utilization efficiency of energy and ensuring a stable supply of energy. [Summary of the invention]

[0004] The purpose of the present invention is to provide an annular solid heat storage system and a method of using the same, so as to solve the problem that the existing solid heat storage system has poor adaptability to application scenarios with unstable load changes.

[0005] The present invention adopts the following technical solution: an annular solid heat storage system, comprising:

[0006] An annular pipeline, on which n solid heat storage modules are evenly connected in series, n ≥ 2; valves are arranged on both sides of each solid heat storage module;

[0007] A water collector, on which n water collection bypass pipes are connected in parallel, each water collection bypass pipe is respectively connected to a position between two adjacent solid heat storage modules on the annular pipeline; each water collection bypass pipe is provided with a valve for controlling its on and off;

[0008] A water distributor, on which n water distribution bypass pipes are connected in parallel, each water distribution bypass pipe is respectively connected to a position between two adjacent solid heat storage modules on the annular pipeline; each water distribution bypass pipe is provided with a valve for controlling its on-off;

[0009] The water collector is used to receive the heat exchange fluid and input the heat exchange fluid into the annular pipeline through each water collection bypass pipe; the solid heat storage module is used to store or release heat for the heat exchange fluid flowing through it by controlling the opening and closing of the valves on both sides; each water distribution bypass pipe is used to output the heat exchange fluid after heat storage or heat release and collect it into the water distributor;

[0010] The number x of conduction pipes of the water collection bypass pipe and the water distribution bypass pipe is adjusted with the change of the real-time total flow rate of the heat exchange fluid input through the water collector, x=Q / q; wherein, x≤n, Q is the real-time total flow rate of the heat exchange fluid input through the water collector, and q is the recommended flow rate of a single solid heat storage module.

[0011] Furthermore, each solid heat storage module is provided with a temperature sensor.

[0012] The present invention also provides a method for using the annular solid heat storage system. Based on the annular solid heat storage system, the method for using the annular solid heat storage system includes the following contents:

[0013] According to the real-time total flow rate Q of the heat exchange fluid input through the water collector and the recommended flow rate q of a single solid heat storage module, the number of open water collection bypass pipes and water distribution bypass pipes is calculated, x = Q / q, x ≤ n;

[0014] Select x water collection bypass pipes on the water collector and open them to transport the heat exchange fluid to the annular pipeline; wherein the x water collection bypass pipes are evenly spaced about the center of the annular pipeline;

[0015] Each opened water collection bypass pipeline transports the heat exchange fluid to a solid heat storage module adjacent to it for heat storage or heat release, and sequentially transfers it to other adjacent solid heat storage modules;

[0016] When the temperature of the heat exchange fluid of the mth solid heat storage module reaches the set temperature, the outlet of the mth solid heat storage module is connected to the adjacent water diversion bypass pipes to transport the heat exchange fluid reaching the set temperature to the water separator.

[0017] Furthermore, when the real-time total flow Q of the heat exchange fluid input through the water collector is less than the start-up flow, each water collection bypass pipe and each water distribution bypass pipe are in a closed state.

[0018] Furthermore, on the annular pipeline, the flow direction of the heat exchange fluid in each solid heat storage module is consistent.

[0019] The beneficial effects of the present invention are as follows: by controlling the valves on the water collection bypass pipe, the water distribution bypass pipe and the annular pipeline, the zoned heat exchange of the solid heat storage system can be realized, the bypass pipe in each zone and the working mode of the solid heat storage module involved can be managed independently, and the working mode of the heat exchange fluid between each zone does not affect each other. At the same time, the output power can be increased according to the number of zones to meet the needs of the heat storage system for the stable output of the high and low loads of the heat source power station with unstable load changes. It has high adaptability to heat source power stations with unstable load changes, safe and reliable independent operation, and greatly reduced selection costs. At the same time, by monitoring the temperature in the heat storage module and the annular pipeline and controlling the valves, the heat exchange fluid output from the annular solid heat storage system is converged in the spherical water collector. The spherical water collector not only plays the role of temperature monitoring, but also acts as a thermostat, thereby ensuring stable temperature output and a high degree of controllability.

Brief Description of the Drawings

[0020] Figure 1 It is a structural schematic diagram of an annular solid heat storage system of the present invention;

[0021] Figure 2 for Figure 1 Side view of

[0022] Figure 3 It is a schematic structural diagram of an embodiment of the present invention.

[0023] Among them, 1. ring pipeline, 2. solid heat storage module, 3. water collector, 4. water collection bypass pipeline, 5. water distributor, 6. water distribution bypass pipeline, 7. solar energy collection system, 8. heat user. [Specific implementation method]

[0024] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] The present invention provides an annular solid heat storage system, such as Figure 1 and Figure 2 As shown, including:

[0026] An annular pipeline 1, on which n solid heat storage modules 2 are evenly connected in series, n ≥ 2; valves are arranged on both sides of each solid heat storage module 2;

[0027] A water collector 3, on which n water collection bypass pipes 4 are connected in parallel, each water collection bypass pipe 4 is respectively connected to a position between two adjacent solid heat storage modules 2 on the annular pipeline 1; each water collection bypass pipe 4 is provided with a valve for controlling its on and off;

[0028] a water distributor 5, on which n water distribution bypass pipes 6 are connected in parallel, each water distribution bypass pipe 6 is respectively connected to a position between two adjacent solid heat storage modules 2 on the annular pipeline 1; each water distribution bypass pipe 6 is provided with a valve for controlling its on-off;

[0029] The water collector 3 is used to receive the heat exchange fluid and input the heat exchange fluid into the annular pipeline 1 through each water collection bypass pipe 4; the solid heat storage module 2 is used to store or release heat for the heat exchange fluid flowing through it by controlling the opening and closing of the valves on both sides thereof; each water distribution bypass pipe 6 is used to output the heat exchange fluid after heat storage or heat release and collect it into the water distributor 5;

[0030] The number x of the conducting water collection bypass pipe 4 and the water distribution bypass pipe 6 is adjusted with the change of the real-time total flow rate of the heat exchange fluid input through the water collector 3, x = Q / q; wherein, x ≤ n, Q is the real-time total flow rate of the heat exchange fluid input through the water collector 3, and q is the recommended flow rate of a single solid heat storage module 2. The recommended flow rate represents the optimal operating flow rate of a single heat storage module. When x is a decimal, it is rounded to an integer.

[0031] In some embodiments, each solid heat storage module 2 is provided with a temperature sensor. The temperature is collected in real time through the temperature sensor. When the temperature of a solid heat storage module 2 reaches the set temperature, the heat exchange fluid output by the solid heat storage module 2 is exported through the water diversion bypass pipe 6, providing data support for when to export the heat exchange fluid after heat exchange.

[0032] The present invention provides a method for using an annular solid heat storage system. Based on the annular solid heat storage system, the method for using includes the following contents:

[0033] According to the real-time total flow Q of the heat exchange fluid input through the water collector 3 and the flow q of a single solid heat storage module 2, the number of open pipes x of the current water collection bypass pipe 4 and the water distribution bypass pipe 6 is calculated as x=Q / q, x≤n;

[0034] Select x water collection bypass pipes 4 on the water collector 3 and open them to transport the heat exchange fluid to the annular pipeline 1; wherein the x water collection bypass pipes 4 are evenly spaced about the center of the annular pipeline 1;

[0035] Each opened water collection bypass pipe 4 transports the heat exchange fluid to a solid heat storage module 2 adjacent thereto for heat storage or heat release, and sequentially transfers the heat exchange fluid to other adjacent solid heat storage modules 2;

[0036] When the temperature of the heat exchange fluid of the mth solid heat storage module 2 reaches the set temperature, the outlet of the mth solid heat storage module 2 is connected to the adjacent water diversion bypass pipe 6 to transport the heat exchange fluid reaching the set temperature to the water separator 5 and output it.

[0037] The temperature of each solid heat storage module 2 is monitored in real time by a temperature sensor. When the real-time total flow rate Q of the input heat exchange fluid changes, the number of connected water collection bypass pipes 4 and water distribution bypass pipes 6 is readjusted to adapt to the change in the total flow rate. The number of water collection bypass pipes 4 and water distribution bypass pipes 6 is the same.

[0038] In some embodiments, when the real-time total flow Q of the heat exchange fluid input through the water collector 3 is less than the start-up flow, each water collection bypass pipe 4 and each water distribution bypass pipe 6 are in a closed state.

[0039] In some embodiments, the flow direction of the heat exchange fluid in each solid heat storage module 2 on the annular pipeline 1 is consistent. The flow direction can be clockwise or counterclockwise. The heat exchange is always maintained in a clockwise or counterclockwise direction, and the temperature distribution gradually decreases. The flow direction of the heat exchange medium is opposite during the heat storage and heat release process, and the heat exchange is downstream, and the heat exchange effect is better.

[0040] Example

[0041] like Figure 3 As shown, the annular solid heat storage system is applied to a system combining a solar thermal power station with waste heat utilization, which specifically includes a solar thermal collection system 7 for providing thermal energy, which is connected to the annular solid heat storage system to form a heat storage loop; and also includes a heat user 8 that uses thermal energy, which is connected to the annular solid heat storage system to form a heat release loop.

[0042] Among them, the minimum starting flow rate of the solar thermal collection system 7 is Qmin=50t / h, the recommended flow rate value q of each solid heat storage module 2 is 50t / h, the number of heat storage modules is 20, and Qmax is 200t / h.

[0043] The heat storage working process is as follows:

[0044] 1) When the solar radiation intensity is low, Q does not reach the minimum starting flow rate, and the solid heat storage module 2 does not operate at this time;

[0045] 2) As time goes by, the solar radiation intensity gradually increases, and the Q value reaches Qmin. At this time, according to the total flow rate Q of the input heat exchange fluid and the recommended flow rate q of each solid heat storage module 2, the number of open water collection bypass pipes 4 is calculated as x=Q / q=1;

[0046] Select a water collection bypass pipeline 4 on the water collector 3 to open, so as to transport the high-temperature heat exchange fluid to the annular pipeline 1;

[0047] The opened water collection bypass pipe 4 conveys the high-temperature heat exchange fluid to an adjacent solid heat storage module 2 for heat storage, and then conveys it to other adjacent solid heat storage modules 2 in sequence; at this time, the solid heat storage module 2 stores heat to cool the high-temperature heat exchange fluid.

[0048] When the temperature of the heat exchange fluid output by the mth solid heat storage module 2 reaches the set temperature, the outlet of the mth solid heat storage module 2 is connected to the water distribution bypass pipe 6 adjacent to it, so as to convey the heat exchange fluid that reaches the set temperature to the water distributor 5 and return it to the solar heat collection system 7. Wherein, m < n.

[0049] 3) As the Q value gradually increases, when x = Q / q = 2, two water collection bypass pipes 4 are selected and opened on the water collector 3 to convey the high-temperature heat exchange fluid to the annular pipeline 1; among them, the two selected water collection bypass pipes 4 are two that are evenly arranged about the center of the annular pipeline 1.

[0050] The two opened water collection bypass pipes 4 convey the high-temperature heat exchange fluid to an adjacent solid heat storage module 2 for heat storage, and each solid heat storage module 2 conveys the heat exchange fluid to other adjacent solid heat storage modules 2 in sequence; at this time, the solid heat storage module 2 stores heat to cool the high-temperature heat exchange fluid.

[0051] When the temperature of the heat exchange fluid output by the mth solid heat storage module 2 reaches the set temperature, the outlet of the mth solid heat storage module 2 is connected to the water distribution bypass pipe 6 adjacent to it, so as to convey the heat exchange fluid that reaches the set temperature to the water distributor 5 and return it to the solar heat collection system 7. Wherein, m < n.

[0052] 4) As the Q value gradually increases, x = Q / q = n, and all n water collection bypass pipes 4 connected to the water collector 3 are opened to convey the heat exchange fluid to the annular pipeline 1.

[0053] Each opened water collection bypass pipe 4 conveys the heat exchange fluid to an adjacent solid heat storage module 2 for heat storage, and then conveys the heat exchange fluid after heat storage to the water distributor 5 through each water distribution bypass pipe 6 and returns it to the solar heat collection system 7.

[0054] 5) As the Q value decreases, the water collection bypass pipes 4 and the water distribution bypass pipes 6 are closed in sequence until Q < Qmin, and the water collection bypass pipes 4 and the water distribution bypass pipes 6 are completely closed.

[0055] The exothermic working process is as follows:

[0056] The total flow rate of the heat exchange fluid required by the heat user 8 from 18:00 to 6:00 is 150 t / h, the total flow rate of the heat exchange fluid required from 6:00 to 10:00 is 50 t / h, the recommended flow rate q of each solid heat storage module 2 is 50 t / h, and the number of heat storage body modules is 20.

[0057] 1) At 18:00-6:00, according to the total flow rate Q1 of the heat exchange fluid required by the heat user 8 at this time and the recommended flow rate q of each solid heat storage module 2, the number of open water collection bypass pipes 4 is calculated as x=Q1 / q=3;

[0058] Select three water collection bypass pipes 4 on the water collector 3 to open, so as to transport the low-temperature heat exchange fluid output by the heat user 8 to the annular pipeline 1; wherein the three water collection bypass pipes 4 are evenly arranged about the center of the annular pipeline 1;

[0059] The three opened water collection bypass pipes 4 respectively transport the low-temperature heat exchange fluid to a solid heat storage module 2 adjacent thereto for heat exchange, and then sequentially transfer it to other adjacent solid heat storage modules 2; at this time, the solid heat storage module 2 releases heat to heat the low-temperature heat exchange fluid;

[0060] When the temperature of the heat exchange fluid output by the mth solid heat storage module 2 reaches the set temperature, the outlet of the mth solid heat storage module 2 is connected to the water diversion bypass pipe 6 adjacent to it to transport the heat exchange fluid reaching the set temperature to the water diverter 5 and return it to the heat user 8.

[0061] 2) From 6:00 to 10:00, according to the total flow rate Q2 of the heat exchange fluid required by the heat user 8 and the recommended flow rate q of each solid heat storage module 2, the number of open water diversion bypass pipes 6 is calculated as x=Q2 / q=1;

[0062] A water diversion bypass pipeline 6 is selected on the water collector 3 to be opened to transport the low-temperature heat exchange fluid output by the heat user 8 to the annular pipeline 1; the water diversion bypass pipeline 6 transports the heat exchange fluid to the adjacent solid heat storage module 2 for heat exchange, and then transports it to other adjacent solid heat storage modules 2 in sequence; at this time, the solid heat storage module 2 releases heat to heat the low-temperature heat exchange fluid;

[0063] When the temperature of the heat exchange fluid of the mth solid heat storage module 2 reaches the set temperature, the outlet of the mth solid heat storage module 2 is connected to the water diversion bypass pipe 6 adjacent to it to transport the heat exchange fluid reaching the set temperature to the water divider 5 and return it to the heat user 8.

[0064] 3) When the time is between 10:00 and 18:00, direct heating is provided by solar energy, and the water collection bypass pipeline 4 and the water distribution bypass pipeline 6 are completely closed.

Claims

1. A ring-shaped solid heat storage system, characterized in that: include: An annular pipeline (1) on which n solid heat storage modules (2) are evenly connected in series, where n≥2; valves are provided on both sides of each of the solid heat storage modules (2); a water collector (3) on which n water collection bypass pipes (4) are connected in parallel, each of the water collection bypass pipes (4) being connected to a position on the annular pipeline (1) between two adjacent solid heat storage modules (2); each of the water collection bypass pipes (4) is provided with a valve for controlling its on and off; a water distributor (5) on which n water distribution bypass pipes (6) are connected in parallel, each of the water distribution bypass pipes (6) being connected to a position on the annular pipeline (1) between two adjacent solid heat storage modules (2); each of the water distribution bypass pipes (6) is provided with a valve for controlling its on and off; The water collector (3) is used to receive the heat exchange fluid and input the heat exchange fluid into the annular pipeline (1) through each of the water collection bypass pipes (4); the solid heat storage module (2) is used to store or release heat for the heat exchange fluid flowing through it by controlling the opening and closing of valves on both sides thereof; each of the water distribution bypass pipes (6) is used to output the heat exchange fluid after heat storage or heat release and collect it into the water distributor (5); The number x of conduction channels of the water collection bypass pipe (4) and the water distribution bypass pipe (6) is adjusted as the real-time total flow rate of the heat exchange fluid input through the water collector (3) changes, x = Q / q; wherein x ≤ n, Q is the real-time total flow rate of the heat exchange fluid input through the water collector (3), and q is the recommended flow rate of a single solid heat storage module (2).

2. The annular solid heat storage system according to claim 1, characterized in that: Each of the solid heat storage modules (2) is provided with a temperature sensor.

3. A method for using an annular solid heat storage system, characterized in that: Based on the annular solid heat storage system according to claim 1 or 2, the method of use includes the following contents: According to the real-time total flow rate Q of the heat exchange fluid input through the water collector (3) and the recommended flow rate q of a single solid heat storage module (2), the number of open lines x = Q / q of the current water collection bypass pipeline (4) and the water distribution bypass pipeline (6) is calculated, where x≤n; Selecting x water collection bypass pipes (4) on the water collector (3) and opening them to transport the heat exchange fluid to the annular pipeline (1); wherein the x water collection bypass pipes (4) are evenly spaced about the center of the annular pipeline (1); Each opened water collection bypass pipe (4) transports the heat exchange fluid to an adjacent solid heat storage module (2) for heat storage or heat release, and sequentially transfers the heat to other adjacent solid heat storage modules (2); When the temperature of the heat exchange fluid of the mth solid heat storage module (2) reaches the set temperature, the outlet of the mth solid heat storage module (2) is connected to the water diversion bypass pipe (6) adjacent to it, so as to transport the heat exchange fluid that has reached the set temperature to the water separator (5).

4. The method for using the annular solid heat storage system according to claim 3, characterized in that: During use, when the real-time total flow rate Q of the heat exchange fluid input through the water collector (3) is less than the start-up flow rate, each of the water collection bypass pipes (4) and each of the water distribution bypass pipes (6) are in a closed state.

5. The method for using the annular solid heat storage system according to claim 3 or 4, characterized in that: On the annular pipeline (1), the flow direction of the heat exchange fluid in each of the solid heat storage modules (2) is consistent.

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