Ultrahigh-temperature solid heat storage device and control method

Abstract

The invention discloses an ultrahigh-temperature solid-state heat storage device and a control method and relates to the field of solid heat storage. The invention aims to solve the problems that the frequency of a fan motor is always kept in an extremely high state and the service life is shortened due to mechanical wear in the conventional design scheme for mixing air by adopting an auxiliary air duct. The controller is used for sequentially controlling the draught fan sets and the air valves corresponding to the N ultra-high-temperature solid-state heat storage device partitions to work when the N ultra-high-temperature solid-state heat storage device partitions are in the heating state, comparing the deviation between the collected water outlet pipe temperature and the preset temperature in real time, and outputting a frequency control signal when the deviation is larger than the preset deviation value. And the frequency of the working fan unit is adjusted. The method is used for controlling the N ultrahigh-temperature solid heat storage devices to work.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of solid heat storage. BACKGROUND

[0002] Traditional ultra-high temperature solid heat storage devices usually adopt a single heat storage partition design. During the heating and heat releasing processes, the temperature of the single heat storage partition changes dramatically, and the temperature of the output hot air changes in a large range, with the highest temperature reaching above 750 DEG C. Therefore, the material requirements for the heat exchange equipment at the rear end are extremely high, resulting in increased costs, and the service life of the heat exchange equipment is reduced when the temperature of the hot air changes in a large range.

[0003] In addition, in the heating and heat releasing processes of the ultra-high temperature solid heat storage device, the air volume usually needs to be controlled by adjusting the frequency of the fan motor in order to maintain stable output heat. However, due to the technical performance of the motor and the frequency converter, the fan cannot operate at a low frequency (such as below 5 Hz) for a long time, otherwise it will cause overheating of the motor, reduction of efficiency, increase of vibration and noise, and even cause equipment failure or fire hazard. Therefore, it is difficult for the traditional device to achieve precise and stable heat output, which easily causes the output heat to exceed the design range, causing damage to the heat exchange equipment and the pipe network system. In severe cases, the return air temperature of the air path system will also increase, causing damage to the fan.

[0004] To solve the above problems, the existing design scheme adopts auxiliary air duct mixing, which generates constant temperature and constant quantity of hot air by mixing cold and hot air, thereby reducing the material requirements for the gas-water heat exchanger, improving the service life, and ensuring the stability of the output hot water temperature. However, this method usually requires the frequency of the fan motor to remain at a very high state, which causes mechanical wear and tear and reduces the service life, and also causes large noise and vibration pollution and overheating of the motor, which poses a fire hazard. SUMMARY

[0005] The purpose of the present application is to solve the problem of the existing design scheme that adopts auxiliary air duct mixing, in which the frequency of the fan motor remains at a very high state, causing mechanical wear and tear and reducing the service life. The present application proposes an ultra-high temperature solid heat storage device and a control method.

[0006] The ultra-high temperature solid heat storage device comprises N ultra-high temperature solid heat storage device partitions, N fan groups, N air valves, a high-temperature air duct, a low-temperature air duct, a gas-water heat exchanger, a first temperature sensor and a controller, and N>2.

[0007] The gas-water heat exchanger is used to exchange heat with the high-temperature air output by the N ultra-high temperature solid heat storage device partitions, and the low-temperature air output is introduced into the N ultra-high temperature solid heat storage device partitions through the low-temperature air duct.

[0008] The gas-water heat exchanger is connected to the N ultra-high temperature solid heat storage device partitions through the high-temperature air duct.

[0009] A fan group is arranged at the inlet of each super-high-temperature solid-state heat storage device partition, and a wind valve is arranged at the outlet of each super-high-temperature solid-state heat storage device partition;

[0010] A first temperature sensor is arranged on the outlet pipe to collect the temperature of the outlet pipe in real time and transmit the temperature to the controller;

[0011] The controller is configured to detect the temperatures of the first super-high-temperature solid-state heat storage device partition to the Nth super-high-temperature solid-state heat storage device partition in sequence when the N super-high-temperature solid-state heat storage device partitions are in the heating state, compare the detected temperatures with the preset heat release temperature in sequence, control the fan group and the wind valve of the next super-high-temperature solid-state heat storage device partition to work when the detected temperature is less than the preset heat release temperature, and compare the deviation between the collected temperature of the outlet pipe and the preset temperature in real time, output a frequency control signal when the deviation is greater than a preset deviation value, and adjust the frequency of the working fan group.

[0012] Preferably, the device further comprises N second temperature sensors,

[0013] The N second temperature sensors are arranged on the N super-high-temperature solid-state heat storage device partitions in sequence to collect the temperatures of the N super-high-temperature solid-state heat storage device partitions and transmit the temperatures to the controller.

[0014] The controller is further configured to compare the collected temperatures of the N super-high-temperature solid-state heat storage device partitions with the preset heat release temperature respectively when the N super-high-temperature solid-state heat storage device partitions are in the heat release state, control the fan group and the wind valve of the super-high-temperature solid-state heat storage device partition whose temperature is greater than the preset heat release temperature to work, and compare the deviation between the collected temperature of the outlet pipe and the preset temperature in real time, output a frequency control signal when the deviation is greater than a preset deviation value, and adjust the frequency of the working fan group.

[0015] Preferably, each fan group comprises M fans, and M>1.

[0016] Preferably, N>2.

[0017] A control method of a super-high-temperature solid-state heat storage device, which is implemented based on the super-high-temperature solid-state heat storage device, and comprises the following contents:

[0018] Step 1: detecting whether the N super-high-temperature solid-state heat storage device partitions are in the heating state or the heat release state, executing step 2 when the N super-high-temperature solid-state heat storage device partitions are in the heating state, and executing step 3 when the N super-high-temperature solid-state heat storage device partitions are in the heat release state;

[0019] Step 2: controlling the N fan groups and the N wind valves to realize heating.

[0020] Step 3, control N fan groups and N air valves to realize heat release.

[0021] Preferably, in step 1, the process of detecting whether N ultra-high-temperature solid-state heat storage device partitions are in heating state or heat release state is:

[0022] Collect the current values of the heating elements in the N ultra-high-temperature solid-state heat storage device partitions, and determine whether the N current values are all greater than 0. If yes, it is determined that the N ultra-high-temperature solid-state heat storage device partitions are in heating state; if no, it is determined that the N ultra-high-temperature solid-state heat storage device partitions are in heat release state.

[0023] Preferably, N current sensors are used to collect the current values of the heating elements in the N ultra-high-temperature solid-state heat storage device partitions.

[0024] Preferably, the process of controlling N fan groups and N air valves to realize heating is:

[0025] Step 21, divide the preset total heating time into N continuous time intervals, in the kth time interval, start the fan group and air valve corresponding to the kth ultra-high-temperature solid-state heat storage device partition, close the fan group and air valve corresponding to other ultra-high-temperature solid-state heat storage device partitions, and detect in real time whether the outlet water pipe temperature is greater than the preset temperature. If yes, adjust the frequency of the fan group corresponding to the kth ultra-high-temperature solid-state heat storage device partition to the preset frequency; if no, do not adjust the frequency of the fan group, and the initial value of k is 1.

[0026] Step 22, determine whether k is equal to N. If yes, after reaching the time interval, the controller closes the heating element of the kth ultra-high-temperature solid-state heat storage device partition, stops the fan group of the kth ultra-high-temperature solid-state heat storage device partition, and closes the corresponding air valve; if no, execute step 23.

[0027] Step 23, make k=k+1, and execute step 21.

[0028] Preferably, the process of controlling N fan groups and N air valves to realize heat release is:

[0029] Step 31, detect the temperature of the mth ultra-high-temperature solid-state heat storage device partition, and the initial value of m is 1. When the temperature of the mth ultra-high-temperature solid-state heat storage device partition is greater than or equal to the preset heat release temperature, control the fan group and air valve of the mth ultra-high-temperature solid-state heat storage device partition to work, and compare the deviation between the collected outlet water pipe temperature and the preset temperature in real time. When the deviation is greater than the preset deviation value, output a frequency control signal to adjust the frequency of the fan group of the mth ultra-high-temperature solid-state heat storage device partition; when the temperature of the mth ultra-high-temperature solid-state heat storage device partition is less than the preset heat release temperature, execute step 32.

[0030] Step 32, judge whether m is equal to N, if yes, control the fan group and the air valve of the mth ultra-high temperature solid-state heat storage device partition to stop working, if not, execute step 33;

[0031] Step 33, make m=m+1, execute step 31.

[0032] Preferably, the preset frequency is 5Hz or above.

[0033] The beneficial effects of the present application are:

[0034] In the heating state, the present application avoids long-time low-frequency or high-frequency operation of the fan, reduces mechanical wear, motor overheating and vibration noise, significantly prolongs the service life of the fan and the frequency converter, and reduces the failure rate. Moreover, the output air temperature of the present device will be reduced, effectively improving the requirements for the material of the heat exchange equipment and prolonging the service life of the heat exchange equipment.

[0035] In the heat release process, only the fan of the ultra-high temperature solid-state heat storage device partition with a temperature higher than the preset heat release temperature is started to avoid invalid ventilation and energy waste; in the heating process, the present application optimizes the heat storage and release process through time sequence control and frequency regulation of the ultra-high temperature solid-state heat storage device partition, and the operation cost is significantly reduced.

[0036] The present application adopts a partition design, which can flexibly expand or reduce the number of partitions according to actual heating demand, and is suitable for different scale application scenarios.

[0037] Compared with the existing auxiliary air duct mixing design, the present application cancels the auxiliary air duct, reduces the material consumption, and at the same time, the temperature of the high-temperature air duct is reduced, the requirements for the material of the air duct are reduced, and the overall cost of the device is further reduced. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is a schematic diagram of the principle of the ultra-high temperature solid-state heat storage device;

[0039] Figure 2 is a flow chart of the control method of the ultra-high temperature solid-state heat storage device. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0041] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be further described below in conjunction with the drawings and specific embodiments, but not as a limitation of the present application.

[0042] Embodiment 1:

[0043] In combination Figure 1 The present embodiment is an ultrahigh-temperature solid heat storage device, which comprises N ultrahigh-temperature solid heat storage partitions 1, N fan groups 2, N air valves 3, a high-temperature air duct 4, a low-temperature air duct 5, an air-water heat exchanger 6, a first temperature sensor 7, and a controller, and N>2.

[0044] The air-water heat exchanger 6 is used for heat exchange of high-temperature air output by the N ultrahigh-temperature solid heat storage partitions 1, and low-temperature air output by the air-water heat exchanger 6 enters the N ultrahigh-temperature solid heat storage partitions 1 through the low-temperature air duct 5.

[0045] The air-water heat exchanger 6 is connected with the N ultrahigh-temperature solid heat storage partitions 1 through the high-temperature air duct 4.

[0046] Each of the N fan groups 2 is arranged at the inlet of each of the N ultrahigh-temperature solid heat storage partitions 1, and each of the N air valves 3 is arranged at the outlet of each of the N ultrahigh-temperature solid heat storage partitions 1.

[0047] The first temperature sensor 7 is arranged on the outlet pipe to collect the temperature of the outlet pipe in real time and transmit the temperature to the controller.

[0048] The controller is used for controlling the N fan groups 2 and the N air valves 3 corresponding to the N ultrahigh-temperature solid heat storage partitions 1 to work in sequence when the N ultrahigh-temperature solid heat storage partitions 1 are in a heating state, and comparing the deviation between the collected temperature of the outlet pipe and a preset temperature in real time, outputting a frequency control signal to adjust the frequency of the working fan group when the deviation is greater than a preset deviation value.

[0049] Further limitation, the device further comprises N second temperature sensors,

[0050] The N second temperature sensors are arranged on the N ultrahigh-temperature solid heat storage partitions 1 in sequence to collect the temperature of the N ultrahigh-temperature solid heat storage partitions 1 and transmit the temperature to the controller.

[0051] The controller is further configured to detect the temperature of the first super-high-temperature solid-state heat storage device partition 1 to the Nth super-high-temperature solid-state heat storage device partition 1 in sequence when the N super-high-temperature solid-state heat storage device partitions 1 are in the heat release state, compare the detected temperature with the preset heat release temperature in sequence, control the fan set 2 and the air valve 3 of the next super-high-temperature solid-state heat storage device partition 1 to work when the detected temperature is less than the preset heat release temperature, and compare the deviation between the collected outlet water pipe temperature and the preset temperature in real time, output a frequency control signal when the deviation is greater than a preset deviation value, and adjust the frequency of the working fan set 2.

[0052] Further limited, each fan set includes M fans, M > 1.

[0053] Further limited, N > 2.

[0054] Specifically, the interior of the super-high-temperature solid-state heat storage device is partitioned and arranged, each region has an independent heat release unit, and each region is controlled to release heat independently when the solid-state heat storage device is in a high-temperature or heating state. When the solid-state heat storage device is below a medium-high temperature, all the fans are controlled to release heat together.

[0055] Embodiment 2:

[0056] Combined Figure 2 The present embodiment is a control method of a super-high-temperature solid-state heat storage device, which is realized based on the super-high-temperature solid-state heat storage device, and includes the following contents:

[0057] Step 1, detecting whether the N super-high-temperature solid-state heat storage device partitions 1 are in a heating state or a heat release state, executing step 2 when the N super-high-temperature solid-state heat storage device partitions 1 are in the heating state, and executing step 3 when the N super-high-temperature solid-state heat storage device partitions 1 are in the heat release state;

[0058] Step 2, controlling the N fan sets 2 and the N air valves 3 to realize heating;

[0059] Step 3, controlling the N fan sets 2 and the N air valves 3 to realize heat release.

[0060] Further limited, in step 1, the process of detecting whether the N super-high-temperature solid-state heat storage device partitions 1 are in the heating state or the heat release state is as follows:

[0061] Collecting the current values of the heating elements in the N super-high-temperature solid-state heat storage device partitions, judging whether the N current values are all greater than 0, determining that the N super-high-temperature solid-state heat storage device partitions 1 are in the heating state if yes, and determining that the N super-high-temperature solid-state heat storage device partitions 1 are in the heat release state if no.

[0062] Further limited, N current sensors are used to collect the current values of the heating elements in the N super-high-temperature solid-state heat storage device partitions.

[0063] Further limited, the process of controlling N fan groups 2 and N air valves 3 to achieve heating is:

[0064] Step 21, divide the preset total heating time into N continuous time intervals, in the kth time interval, start the fan group 2 and the air valve 3 corresponding to the kth ultra-high temperature solid-state heat storage device partition 1, close the fan group 2 and the air valve 3 corresponding to other ultra-high temperature solid-state heat storage device partitions 1, and detect whether the outlet water pipe temperature is greater than the preset temperature in real time, if yes, adjust the frequency of the fan group 2 corresponding to the kth ultra-high temperature solid-state heat storage device partition 1 to the preset frequency, if not, do not adjust the frequency of the fan group 2, and the initial value of k is 1;

[0065] Step 22, judge whether k is equal to N, if yes, after reaching the time interval, the controller closes the heating element of the kth ultra-high temperature solid-state heat storage device partition 1, and stops the fan group 2 of the kth ultra-high temperature solid-state heat storage device partition 1 at the same time, and closes the corresponding air valve 3, if not, execute step 23;

[0066] Step 23, make k=k+1, execute step 21.

[0067] Further limited, the process of controlling N fan groups 2 and N air valves 3 to achieve heat release is:

[0068] Step 31, detect the temperature of the mth ultra-high temperature solid-state heat storage device partition 1, the initial value of m is 1, when the temperature of the mth ultra-high temperature solid-state heat storage device partition 1 is greater than or equal to the preset heat release temperature, control the fan group 2 and the air valve 3 of the mth ultra-high temperature solid-state heat storage device partition 1 to work, and compare the deviation between the collected outlet water pipe temperature and the preset temperature in real time, when the deviation is greater than the preset deviation value, output a frequency control signal to adjust the frequency of the fan group 2 of the mth ultra-high temperature solid-state heat storage device partition 1, when the temperature of the mth ultra-high temperature solid-state heat storage device partition 1 is less than the preset heat release temperature, execute step 32;

[0069] Step 32, judge whether m is equal to N, if yes, control the fan group 2 and the air valve 3 of the mth ultra-high temperature solid-state heat storage device partition 1 to stop working, if not, execute step 33;

[0070] Step 33, make m=m+1, execute step 31.

[0071] Further limited, the preset frequency is 5Hz or more.

[0072] Specifically, the control principle is: the control method is divided into two cases of temperature rise of the ultra-high temperature solid-state heat storage device (heating element heating) and temperature reduction (heat storage and heat release).

[0073] When the device temperature rises, according to the heating time, the average is divided into three time intervals, respectively control 1 area fan group to N area fan group alone work, 1 area air valve to N area air valve control medium flow direction.

[0074] When the device temperature decreases, check the super high temperature solid heat storage device 1 to the super high temperature solid heat storage device N area of heat storage temperature, when the super high temperature solid heat storage device 1 area temperature is lower than the set value, switch the super high temperature solid heat storage device 2 area to carry out heat release, in turn to carry out the super high temperature solid heat storage device N area heat release, when the three area temperature is lower than the set value, start 1 area fan to N area fan 6, open 1 area air valve to N area air valve, super high temperature solid heat storage device 1 area to super high temperature solid heat storage device N area of heat release at the same time.

[0075] Temperature sensor control 1 area fan to N area fan frequency.

[0076] Gas water heat exchanger and temperature sensor for system output hot water design, when the system output steam, hot air, heat conducting oil, also in the scope of this patent.

[0077] Although the present application has been described herein with reference to particular embodiments thereof, it is to be understood that the examples are merely illustrative of the principles and applications of the present application. It is therefore to be understood that numerous modifications can be made to the illustrative examples and that other arrangements can be devised without departing from the spirit and scope of the present application as defined by the appended claims. It is to be understood that the features of the dependent claims can be combined with the features of the independent claims in any way possible. It is also to be understood that features described in relation to one example can be used in other examples.

Claims

1. Ultra-high temperature solid-state heat storage device, characterized in that, The system comprises N super-high-temperature solid-state heat storage device partitions (1), N fan groups (2), N air valves (3), a high-temperature air duct (4), a low-temperature air duct (5), an air-water heat exchanger (6), a first temperature sensor (7) and a controller, and N>2. The air-water heat exchanger (6) is used for heat exchange of high-temperature air output by the N super-high-temperature solid-state heat storage device partitions (1), and low-temperature air output by the air-water heat exchanger (6) enters the N super-high-temperature solid-state heat storage device partitions (1) through the low-temperature air duct (5). The air-water heat exchanger (6) is connected with the N super-high-temperature solid-state heat storage device partitions (1) through the high-temperature air duct (4). One fan group (2) is arranged at the inlet of each super-high-temperature solid-state heat storage device partition (1), and one air valve (3) is arranged at the outlet of each super-high-temperature solid-state heat storage device partition (1). The first temperature sensor (7) is arranged on the water outlet pipe and used for collecting the temperature of the water outlet pipe in real time and transmitting the temperature to the controller. The controller is used for controlling the fan groups (2) and the air valves (3) corresponding to the N super-high-temperature solid-state heat storage device partitions (1) to work in sequence when the N super-high-temperature solid-state heat storage device partitions (1) are in a heating state, and the controller is also used for comparing the deviation between the collected temperature of the water outlet pipe and a preset temperature in real time, outputting a frequency control signal when the deviation is greater than a preset deviation value, and adjusting the frequency of the working fan group.

2. The ultra-high temperature solid heat storage device of claim 1, wherein, The device further comprises N second temperature sensors, The N second temperature sensors are arranged on the N super-high-temperature solid-state heat storage device partitions (1) in sequence and used for collecting the temperatures of the N super-high-temperature solid-state heat storage device partitions (1) and transmitting the temperatures to the controller. The controller is also used for detecting the temperatures of the first super-high-temperature solid-state heat storage device partition (1) to the Nth super-high-temperature solid-state heat storage device partition (1) in sequence when the N super-high-temperature solid-state heat storage device partitions (1) are in a heat release state, comparing the detected temperatures with preset heat release temperatures in sequence, controlling the fan groups (2) and the air valves (3) of the next super-high-temperature solid-state heat storage device partition (1) to work when the detected temperature is less than the preset heat release temperature, comparing the deviation between the collected temperature of the water outlet pipe and a preset temperature in real time, outputting a frequency control signal when the deviation is greater than a preset deviation value, and adjusting the frequency of the working fan group (2).

3. The ultra-high temperature solid heat storage device of claim 1, wherein, Each fan group comprises M fans, and M>1.

4. The ultra-high temperature solid heat storage device of claim 1, wherein, N＞2。 5. A control method of the ultra-high temperature solid-state heat storage device, which is implemented based on the ultra-high temperature solid-state heat storage device according to claim 1, characterized by, The method comprises the following contents: Step 1, detecting whether the N super-high-temperature solid-state heat storage device partitions (1) are in a heating state or a heat release state, executing step 2 when the N super-high-temperature solid-state heat storage device partitions (1) are in the heating state, and executing step 3 when the N super-high-temperature solid-state heat storage device partitions (1) are in the heat release state; Step 2, controlling the N fan groups (2) and the N air valves (3) to realize heating; Step 3, controlling the N fan groups (2) and the N air valves (3) to realize heat release.

6. The control method of the super-high-temperature solid heat storage device according to claim 5, wherein In step 1, the process of detecting whether the N super-high-temperature solid-state heat storage device partitions (1) are in a heating state or a heat release state is as follows: Collecting N current values of heating elements in N super-high-temperature solid-state heat storage device partitions, judging whether the N current values are all greater than 0, if yes, determining that the N super-high-temperature solid-state heat storage device partitions (1) are in a heating state, if not, determining that the N super-high-temperature solid-state heat storage device partitions (1) are in a heat release state.

7. The control method of the super-high-temperature solid heat storage device according to claim 6, characterized by, N current values of heating elements in N super-high-temperature solid-state heat storage device partitions are collected by N current sensors.

8. The control method of the super-high-temperature solid heat storage device according to claim 5, wherein The process of controlling N fan groups (2) and N air valves (3) to realize heating is as follows: Step 21, dividing a preset total heating time into N continuous time intervals, in the kth time interval, starting the fan group (2) and the air valve (3) corresponding to the kth super-high-temperature solid-state heat storage device partition (1), closing the fan group (2) and the air valve (3) corresponding to other super-high-temperature solid-state heat storage device partitions (1), and detecting whether the outlet water pipe temperature is greater than a preset temperature in real time, if yes, adjusting the frequency of the fan group (2) corresponding to the kth super-high-temperature solid-state heat storage device partition (1) to a preset frequency, if not, not adjusting the frequency of the fan group (2), the initial value of k is 1; Step 22, judging whether k is equal to N, if yes, after reaching the time interval, the controller closes the heating element of the kth super-high-temperature solid-state heat storage device partition (1), stops the fan group (2) of the kth super-high-temperature solid-state heat storage device partition (1), and closes the corresponding air valve (3), if not, executing step 23; Step 23, making k=k+1, and executing step 21.

9. The control method of the super-high-temperature solid heat storage device according to claim 4 or 8, characterized by, The process of controlling N fan groups (2) and N air valves (3) to realize heat release is as follows: Step 31, detecting the temperature of the mth super-high-temperature solid-state heat storage device partition (1), the initial value of m is 1, when the temperature of the mth super-high-temperature solid-state heat storage device partition (1) is greater than or equal to a preset heat release temperature, controlling the fan group (2) and the air valve (3) of the mth super-high-temperature solid-state heat storage device partition (1) to work, and comparing the deviation between the collected outlet water pipe temperature and the preset temperature in real time, when the deviation is greater than a preset deviation value, outputting a frequency control signal to adjust the frequency of the fan group (2) of the mth super-high-temperature solid-state heat storage device partition (1), when the temperature of the mth super-high-temperature solid-state heat storage device partition (1) is less than the preset heat release temperature, executing step 32; Step 32, judging whether m is equal to N, if yes, controlling the fan group (2) and the air valve (3) of the mth super-high-temperature solid-state heat storage device partition (1) to stop working, if not, executing step 33; Step 33, making m=m+1, and executing step 31.

10. The control method of the super-high-temperature solid heat storage device according to claim 9, characterized by, The preset frequency is greater than or equal to 5 Hz.

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