CN107726427B - Temperature control method of heat storage device and heat supply system - Google Patents
Temperature control method of heat storage device and heat supply system Download PDFInfo
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- CN107726427B CN107726427B CN201710986324.0A CN201710986324A CN107726427B CN 107726427 B CN107726427 B CN 107726427B CN 201710986324 A CN201710986324 A CN 201710986324A CN 107726427 B CN107726427 B CN 107726427B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D11/00—Central heating systems using heat accumulated in storage masses
- F24D11/002—Central heating systems using heat accumulated in storage masses water heating system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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Abstract
The application belongs to the technical field of control systems, and particularly relates to a temperature control method of a heat storage device and a heat supply system. The temperature control method of the heat storage device includes: under a preset condition, starting a heating device to heat a heat storage medium in the heat storage device; acquiring the temperature of a heat storage medium at an inlet and an outlet of a heating device; and adjusting the flow of a heat storage water pump connected with the heating device and the heat storage device according to the comparison between the outlet temperature of the heat storage device and the temperature difference between the threshold temperature and the heating temperature of the heating device, wherein the flow speed of the heat storage medium flowing from the heating device to the heat storage device is increased, so that the temperature of the heat storage medium in the heat storage device reaches the threshold temperature. The heating device does not have jumping electric operation during the heat accumulation period of the heating system, does not have repeated heating process, shortens the heating period, reduces the energy loss and reduces the equipment abrasion.
Description
Technical Field
The application belongs to the technical field of control systems, and particularly relates to a temperature control method of a heat storage device and a heat supply system.
Background
The heating system is used with a heating device and a heat storage device, and the heating device transmits heat to the heat storage device by heating a heat storage medium; in general, the higher the temperature of the thermal storage medium, the more heat the heating system stores.
The highest temperature of the heat storage device controlled by the heat supply system is difficult to reach, the heating device can automatically protect because the unloading temperature is exceeded, and the heating switch trips, so that the highest temperature of the heat storage medium in the heat storage device is not reached yet or just reached temporarily; therefore, the whole heat storage process often needs to be repeated for a plurality of tripping and closing actions by the heating device, so that the heating time of the heating system is prolonged, the heat loss is correspondingly increased, the abrasion of equipment is increased, and the service cycle of the equipment is shortened.
Disclosure of Invention
In view of this, the embodiments of the present application provide a temperature control method of a heat storage device and a heating system, so as to solve the problems of the current heating system that the heating time is prolonged, the heat loss is correspondingly increased, the wear of equipment is increased, and the service period of the equipment is shortened.
A first aspect of an embodiment of the present application provides a temperature control method of a thermal storage device, including:
under a preset condition, starting a heating device to heat a heat storage medium in the heat storage device;
acquiring the temperature of a heat storage medium at an inlet and an outlet of a heating device;
and adjusting the flow of a heat storage water pump connected with the heating device and the heat storage device according to the comparison between the outlet temperature of the heat storage device and the temperature difference between the threshold temperature and the heating temperature of the heating device, wherein the flow speed of the heat storage medium flowing from the heating device to the heat storage device is increased, so that the temperature of the heat storage medium in the heat storage device reaches the threshold temperature.
Further, the preset condition is that the current is in a valley period and the thermal storage medium in the thermal storage device does not reach a threshold temperature.
Further, the obtaining the temperature of the heating medium at the inlet and the outlet of the heating device includes:
acquiring the temperature of a heat storage medium at an outlet of the heat storage device through a sensor arranged on an outlet pipeline of the heating device;
the temperature of the thermal storage medium at the inlet of the thermal storage device is acquired by a sensor mounted on the inlet pipe of the heating device.
Further, the adjusting the flow rate of the heat storage water pump connecting the heating device and the heat storage device according to the temperature of the heat storage medium at the inlet and the outlet of the heating device includes:
obtaining flow control coefficients according to the temperature of the heat storage medium at the inlet and the outlet of the heating device and the threshold temperature of the heat storage device;
and controlling the flow of the heat accumulating water pump according to the flow control coefficient.
Further, the obtaining a flow control coefficient from the temperatures of the thermal storage medium at the inlet and the outlet of the thermal storage device and the threshold temperature of the thermal storage device includes:
wherein S represents the flow control coefficient, T represents a threshold temperature of the heat storage device, and T 1 Representing the temperature of the thermal storage medium at the outlet of the heating device, said t 2 Representing the temperature of the thermal storage medium at the inlet of the heating device.
Further, the controlling the flow rate of the water storage pump according to the flow rate control coefficient includes:
wherein, G represents the flow of the heat accumulating water pump; the Q represents the heat storage power of the heating device; the delta t represents the temperature difference of a heat storage medium at the water inlet and the water outlet of the heating device, and delta t= |t 1 -t 2 |。
Further, the temperature control method of the heat storage device further includes:
calculating and setting the volume of the heat storage medium in the heat storage device according to the specific heat capacity, the initial temperature, the threshold temperature and the preset heat supply requirement of the heat storage medium:
wherein V represents the volume of a heat storage medium in the heat storage device, M represents the heat of the preset heat supply demand, C represents the specific heat capacity of the heat storage medium, ρ represents the density of the heat storage medium, and t 3 Representing an initial temperature of the thermal storage medium;
the heat of the preset heat supply demand is the total heat demand for heat storage of the heat storage medium in the heat storage device in the peak electricity period.
A second aspect of embodiments of the present application provides a heating system, comprising:
the device comprises a heating device, a heat storage water pump, a first temperature sensor, a second temperature sensor, a controller and a heat supply pipeline;
the controller is respectively and electrically connected with the heating device, the heat storage water pump, the first temperature sensor and the second temperature sensor;
the heating device outlet is connected with the heat storage device inlet through the heating pipeline, and the heat storage device outlet is connected with the heating device inlet through the heating pipeline; the heat storage water pump is connected to the heat supply pipeline between the outlet of the heat storage device and the inlet of the heating device; the first temperature sensor is arranged in the heat supply pipeline at one side of the outlet of the heat storage device, and the second temperature sensor is arranged in the heat supply pipeline at one side of the outlet of the heating device;
the controller obtains the temperature of the heat storage medium at the inlet of the heating device through the first temperature sensor; the controller acquires the temperature of the heat storage medium at the outlet of the heating device through the second temperature sensor; the controller compares and calculates a difference value between the temperature of the heat storage medium at the outlet of the heating device and the temperature of the heat storage medium at the inlet of the heating device with a difference value between the temperature of the heat storage medium at the outlet of the heat storage device and the threshold temperature to obtain a control coefficient; the controller controls the flow rate of the heat storage water pump according to the flow control coefficient, and the flow rate of the heat storage medium flowing from the heating device to the heat storage device is changed, so that the temperature of the heat storage medium in the heat storage device gradually reaches a threshold temperature.
Compared with the prior art, the technical scheme of the embodiment of the application has the beneficial effects that:
according to the embodiment of the application, the temperature of the heat storage medium at the inlet of the heating device and the temperature of the heat storage medium at the outlet of the heating device are obtained through the temperature sensor; according to the temperature and threshold temperature of the heat storage medium at the inlet and the outlet of the heating device, the flow rate of the heat storage medium flowing from the heating device to the heat storage device is regulated, so that the temperature of the heat storage medium in the heat storage device reaches the threshold temperature; the heat storage water pump timely adjusts the flow between the heating device and the heat storage device, and ensures that the temperature difference between the water outlet temperature and the threshold temperature of the heat storage device is within a controllable safety range of the heating temperature of the heating device, so that stable heat storage of the heat storage device is ensured under the condition that the heating device works, and the temperature of a heat storage medium in the heat storage device reaches the threshold temperature; the heating device does not have jumping electric operation during heat accumulation, does not have repeated heating process, shortens the heating period, reduces energy loss and reduces equipment abrasion.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required for the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a control flowchart of a temperature control method of a heat storage device according to an embodiment of the present application;
fig. 2 is a schematic block diagram of a heating system provided in an embodiment of the present application.
Wherein, each reference sign in the figure:
1-a controller; 2-a heating device; 3-a heat storage device; 4-a heat storage water pump; 5-a first temperature sensor; 6-a second temperature sensor; 7-an inlet heating pipeline of the heating device; 8-heating device outlet heating pipeline.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
In order to illustrate the technical solutions described in the present application, the following description is made by specific examples.
A first aspect of the embodiments of the present application provides a temperature control method of a thermal storage device,
referring to fig. 1, a control flowchart of a temperature control method of a thermal storage device according to an embodiment of the present application is provided.
The method may include the steps of:
step S101, under preset conditions, starting a heating device to heat the heat storage medium in the heat storage device.
The preset condition is that the heat storage medium in the heat storage device does not reach a threshold temperature in a valley period.
In particular, the method is used for storing heat through the heat storage medium in the valley period and supplying heat through the heat storage medium in the peak period.
The heat storage medium is in a liquid state and flows in the heating device and the heat storage device through the heat storage water pump and the heat supply pipeline; the heat storage medium is heated in the heating device, and the heat storage medium stores heat in the heat storage device.
The threshold temperature generally refers to the highest temperature that can be reached by the thermal storage medium in the thermal storage device, and may also be a target temperature of the thermal storage medium in the thermal storage device set by the controller;
the highest temperature is the highest temperature which can be reached by heat accumulation of the heat accumulation medium in the heat accumulation device without power jump of the heating device;
the target temperature is any value between an initial temperature of the thermal storage medium within the thermal storage device and a maximum temperature that the thermal storage medium within the thermal storage device can reach.
Step S102, the temperature of the heat storage medium at the inlet and the outlet of the heating device is acquired through a temperature sensor.
The obtaining the temperature of the thermal storage medium at the inlet and the outlet of the heating device comprises:
acquiring the temperature of a heat storage medium at an outlet of the heat storage device through a sensor arranged on an outlet pipeline of the heating device;
the temperature of the thermal storage medium at the inlet of the thermal storage device is acquired by a sensor mounted on the inlet pipe of the heating device.
The sensor is a temperature sensor.
Step S103, according to the comparison between the temperature difference between the outlet temperature of the heat storage device and the threshold temperature and the heating temperature of the heating device, the flow of a heat storage water pump connected with the heating device and the heat storage device is regulated;
specifically, a flow control coefficient is obtained according to the temperature of the heat storage medium at the inlet and the outlet of the heating device and the threshold temperature of the heat storage device; and controlling the flow of the heat accumulating water pump according to the flow control coefficient.
The flow control coefficient
Wherein S represents the flow control coefficient, T represents a threshold temperature of the heat storage device, and T 1 Representing a thermal storage medium at the outlet of the heating deviceMass temperature, t 2 Representing the temperature of the thermal storage medium at the inlet of the heating device.
When the flow control coefficient is about 1 but not less than 1, the controller starts to control the heat storage water pump to increase the flow of the heat storage water pump and ensure the safe operation of the system; the flow rate of the heat storage medium flowing from the heating device to the heat storage device becomes large so that the temperature of the heat storage medium in the heat storage device gradually reaches the threshold temperature.
Specifically, the flow of the heat storage water pump is controlled to be according to the flow control coefficient
Wherein G represents the flow rate of the heat storage water pump, and the unit is t/h; q represents the heat storage power of the heating device, and the unit is W; the delta t represents the temperature difference between the heat storage medium at the inlet and the heat storage medium at the outlet of the heating device, and delta t= |t 1 -t 2 I, units of deg.c.
According to
When the heat storage power Q of the heating device is unchanged, the heat storage water pump flow G is inversely proportional to the temperature difference delta t between the water inlet and the water outlet of the heating device, the heat storage water pump flow G is gradually increased, delta t is gradually reduced, and the heat storage medium in the heat storage device is increased by a small temperature difference, so that the heating device is prevented from being protected by power-off due to ultra-high temperature jump. Up to Deltat 1 And when the temperature reaches 0, the threshold temperature T of the heat storage device is reached. And the controller controls the heat storage water pump and the heating device to stop running.
According to the embodiment of the application, the temperature of the heat storage medium at the inlet of the heating device and the temperature of the heat storage medium at the outlet of the heating device are obtained through the temperature sensor; according to the temperature and threshold temperature of the heat storage medium at the inlet and the outlet of the heating device, the flow rate of the heat storage medium flowing from the heating device to the heat storage device is regulated, so that the temperature of the heat storage medium in the heat storage device reaches the threshold temperature; the heat storage water pump timely adjusts the flow between the heating device and the heat storage device, ensures that the heat storage device stably stores heat under the condition that the heating device works, and ensures that the temperature of a heat storage medium in the heat storage device reaches a threshold temperature; the heating device does not have jumping electric operation during heat accumulation, does not have repeated heating process, shortens the heating period, reduces energy loss and reduces equipment abrasion.
As another embodiment of the present application, the controller is further required to calculate and set the volume of the thermal storage device containing the thermal storage medium before the heating device is activated to heat the thermal storage medium in the heating device.
Calculating and setting the volume of the heat storage medium in the heat storage device according to the specific heat capacity, the initial temperature, the threshold temperature and the preset heat supply requirement of the heat storage medium:
wherein V represents the volume of a heat storage medium in the heat storage device, M represents the heat of the preset heat supply demand, C represents the specific heat capacity of the heat storage medium, ρ represents the density of the heat storage medium, and t 3 Representing an initial temperature of the thermal storage medium; the heat of the preset heat supply demand is the total heat demand for heat storage of the heat storage medium in the heat storage device in the peak electricity period.
The heat M of the preset heat supply requirement of the external heat dissipation unit may be an average value of total heat of the heat supply system with the same specification, which is not optimally controlled according to the statistics record, of external heat dissipation through the external heat dissipation unit in a peak electricity period, or may be an average value calculated by the heat supply system of the total heat of external heat dissipation through the heat dissipation unit in a single peak electricity period which is statistically recorded through the controller, and is updated and set in a next valley electricity period.
The heat of the preset heat supply requirement of the external heat dissipation unit is the total heat requirement of the external heat dissipation unit on heat storage of the internal heat storage medium of the heat storage device in the whole peak electricity period.
Further, under a preset condition, the heating device heats and works, and the controller controls the heat storage medium in the heat storage device to reach a threshold temperature; and under the non-preset condition, the heat storage device dissipates heat to the outside.
Specifically, the preset condition is that the heating system is in a valley period and the heat storage medium in the heat storage device does not reach a threshold temperature. The non-preset condition is that the heating device of the heating system stops working in a peak power period.
According to the temperature control method of the heat storage device supplemented by the other embodiment of the application, heat is stored in the valley period, and heat is dissipated in the peak period; the controller calculates the volume of the heat storage medium required to be stored in the heat storage device to determine the heat storage quantity, so that the external energy consumption and the heat storage quantity are used and utilized in a maximum optimization mode, and the cost is saved.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic of each process, and should not limit the implementation process of the embodiment of the present application in any way.
Fig. 2 is a schematic block diagram of a heating system provided in an embodiment of the present application, and only a portion related to the embodiment of the present application is shown for convenience of explanation.
The heating system includes:
the device comprises a controller 1, a heating device 2, a heat storage device 3, a heat storage water pump 4, a first temperature sensor 5, a second temperature sensor 6, a heating device inlet heat supply pipeline 7 and a heating device outlet heat supply pipeline 8;
the controller 1 is electrically connected with the heating device 2, the heat storage water pump 4, the first temperature sensor 5 and the second temperature sensor 6;
the outlet of the heating device 2 is connected with the inlet of the heat storage device 3 through the heat supply pipeline 7, and the outlet of the heat storage device 3 is connected with the inlet of the heating device 2 through the heat supply pipeline 7; the heat storage water pump 4 is connected to the heat supply pipeline 7 between the outlet of the heat storage device 3 and the inlet of the heating device 2; the first temperature sensor 5 is arranged in a heat supply pipeline at the outlet side of the heat storage device 3, and the second temperature sensor 6 is arranged in a heat supply pipeline at the outlet side of the heating device 2; a heat storage medium flows in the heating device 2, the heat storage device 3, the heat storage water pump 4, the heating device inlet heat supply pipeline 7 and the heating device outlet heat supply pipeline 8;
the heating pipeline used for connection between the inlet of the heating device 2 and the outlet of the heat storage device 3 is a heating device inlet heating pipeline 7, and the heating pipeline used for connection between the outlet of the heating device 2 and the inlet of the heat storage device 3 is a heating device outlet heating pipeline 8; the first temperature sensor 5 is arranged in a heat supply pipeline at the outlet side of the heat storage device 3, and the second temperature sensor 6 is arranged in a heat supply pipeline at the outlet side of the heating device 2;
further, the temperature of the heat storage medium at the inlet of the heating device is equal to the temperature of the heat storage medium at the outlet of the heating device; the temperature of the heat storage medium at the outlet of the heating device is equal to that of the heat storage medium at the inlet of the heat storage device.
The inlet heat supply pipeline of the heating device is the outlet heat supply pipeline of the heat storage device, and the outlet heat supply pipeline of the heating device is the inlet heat supply pipeline of the heat storage device.
The heat storage water pump can be arranged at any position on the inlet heat supply pipeline of the heating device and also can be arranged at any position on the outlet heat supply pipeline of the heating device;
further, the controller may be a single chip microcomputer or a programmable logic controller.
The singlechip (Microcontrollers) is an integrated circuit chip, and is a small and perfect microcomputer system formed by integrating functions such as a central processing unit (Central Processing Unit, CPU), a random access Memory (Random Access Memory, RAM), a Read-Only Memory (ROM), various I/O ports, an interrupt system, a timer/counter and the like (possibly including circuits such as a display driving circuit, a pulse width modulation circuit, an analog multiplexer, an A/D converter and the like) with a silicon chip by adopting a very large scale integrated circuit technology.
The programmable logic controller (Programmable Logic Controller, PLC) is a digital operation electronic system designed specifically for application in an industrial environment. It adopts a programmable memory, in its interior is stored the instruction for executing logic operation, sequence control, timing, counting and arithmetic operation, etc. and utilizes digital or analog input and output to control various mechanical equipments or production processes.
Further, the temperature of the thermal storage medium at the inlet of the thermal storage device is equal to the temperature of the thermal storage medium at the outlet of the heating device; the temperature of the heat storage medium at the outlet of the heat storage device is equal to the temperature of the heat storage medium at the inlet of the heating device.
Specifically, the first temperature sensor may be installed at any position on a heating pipe connected between the outlet of the heat storage device and the inlet of the heating device: the first temperature sensor can be positioned in a heat supply pipeline near the outlet of the heat storage device, can be positioned in a heat supply pipeline near the heat storage water pump, and can be positioned in a heat supply pipeline near the inlet of the heating device;
the second temperature sensor may be installed at any position on a heating pipe connected between the heat storage device inlet and the heating device outlet: the second temperature sensor can be positioned in a heat supply pipeline near the inlet of the heat storage device or in a heat supply pipeline near the outlet of the heating device;
the first temperature sensor and the second temperature sensor may be of the same model.
Further, the heating device may be an electric boiler; the heat storage water pump is a variable-frequency heat storage water pump;
the electric boiler is also called an electric heating boiler or an electric heating boiler, and is a boiler device which takes electric power as energy and converts the electric power into heat energy, so that steam, high temperature water or an organic heat carrier with certain heat energy is output outwards through boiler conversion.
The heat storage water pump can be a variable frequency heat storage water pump, and the variable frequency heat storage water pump is a variable frequency heat storage water supply device which has full-automatic function and automatic constant pressure and is formed by a one-way valve, an air pressure tank, a frequency converter, a constant pressure constant temperature water supply controller, a sensor and other pipe valves or electric elements on the basis of a common water pump.
Further, the thermal storage device selects a volume model according to the volume required to accommodate the thermal storage medium.
Specifically, the volume model of the heat storage device is greater than or equal to the volume of the heat storage medium to be contained in the heat storage device calculated by the controller; the volume of the thermal storage device that specifically accommodates the thermal storage medium is calculated and set by the controller.
Further, the power of the electric boiler is determined, and the power of the variable-frequency heat storage water pump is determined.
The controller selects the power of the electric boiler and the power of the heat storage water pump according to the heat of the preset heat supply requirement of the external heat radiating unit and the duration that the heating system can continuously work in the valley period, so that the electric boiler and the frequency conversion heat storage water pump can work to meet the requirement.
Further, the heat storage device is a heat storage water tank; the heat storage medium is a liquid heat storage medium and is stored in the heat storage water tank; the heat accumulating liquid medium may be water.
Specifically, the controller acquires the temperature of the heat storage medium at the inlet of the heating device through the first temperature sensor; the controller acquires the temperature of the heat storage medium at the outlet of the heating device through the second temperature sensor; the controller compares and calculates a difference value between the temperature of the heat storage medium at the outlet of the heating device and the temperature of the heat storage medium at the inlet of the heating device with a difference value between the temperature of the heat storage medium at the outlet of the heat storage device and the threshold temperature to obtain a control coefficient; the controller acquires heat storage power of the heating device and flow transmission size of the heat storage water pump; the controller controls the actual working flow transmission size of the heat storage water pump according to the control coefficient, the heat storage power of the heating device and the flow transmission size of the variable-frequency heat storage water pump; the heat storage water pump timely adjusts the flow transmission size according to the actual working requirement change until a heat storage medium in the heat storage device reaches the threshold temperature; the controller calculates and sets a volume of the thermal storage device to accommodate a thermal storage medium; in the valley period, the electric boiler of the heating system heats and works, and the controller controls the water in the heat storage water tank to reach the highest temperature; and in the peak electricity period, the heat storage water tank dissipates heat and dissipates heat.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (6)
1. A method of controlling a temperature of a heat storage device, comprising:
under a preset condition, starting a heating device to heat a heat storage medium in the heat storage device;
acquiring the temperature of a heat storage medium at an inlet and an outlet of a heating device;
according to the comparison between the outlet temperature of the heat storage device and the temperature difference between the threshold temperature and the heating temperature of the heating device, the flow rate of a heat storage pump connected with the heating device and the heat storage device is regulated, and the flow rate of the heat storage medium flowing from the heating device to the heat storage device is increased, so that the temperature of the heat storage medium in the heat storage device reaches the threshold temperature;
the flow rate adjusting device for adjusting the flow rate of the heat storage water pump connected with the heating device and the heat storage device according to the comparison between the outlet temperature of the heat storage device and the temperature difference between the threshold temperature and the heating temperature of the heating device comprises the following steps:
obtaining flow control coefficients according to the temperature of the heat storage medium at the inlet and the outlet of the heating device and the threshold temperature of the heat storage device; when the flow control coefficient is toward 1 but not less than 1, controlling the flow of the heat storage water pump according to the flow control coefficient;
the obtaining a flow control coefficient from the temperature of the thermal storage medium at the inlet and the outlet of the heating device and the threshold temperature of the thermal storage device includes:
wherein S represents the flow control coefficient, T represents the threshold temperature of the heat storage device, and
representing the temperature of the heat accumulating medium at the outlet of the heating device, said +.>
Representing the temperature of the thermal storage medium at the inlet of the heating device;
the controlling the flow rate of the heat storage water pump according to the flow rate control coefficient includes:
wherein, G represents the flow of the heat accumulating water pump; the Q represents the heat storage power of the heating device; the said
Indicating the temperature difference of the heat storage medium at the water inlet and the water outlet of the heating device, and the temperature difference is +.>
。
2. The method according to claim 1, wherein the preset condition is that the heat storage medium in the heat storage device is currently in a valley period and does not reach a threshold temperature.
3. The method of temperature control of a thermal storage device according to claim 1, wherein the obtaining the temperature of the thermal storage medium at the inlet and at the outlet of the heating device comprises:
acquiring the temperature of a heat storage medium at the outlet of the heating device through a sensor arranged on an outlet pipeline of the heating device;
the temperature of the thermal storage medium at the inlet of the heating device is obtained by a sensor mounted on the inlet pipe of the heating device.
4. The method of controlling the temperature of a heat storage device according to claim 1, further comprising:
calculating and setting the volume of the heat storage medium in the heat storage device according to the specific heat capacity, the initial temperature, the threshold temperature and the preset heat supply requirement of the heat storage medium:
wherein V represents the volume of a heat storage medium in the heat storage device, M represents the heat of the preset heat supply demand, C represents the specific heat capacity of the heat storage medium, ρ represents the density of the heat storage medium, and
representing an initial temperature of the thermal storage medium;
the heat of the preset heat supply demand is the total heat demand for heat storage of the heat storage medium in the heat storage device in the peak electricity period.
5. A heating system, comprising:
the device comprises a heating device, a heat storage water pump, a first temperature sensor, a second temperature sensor, a controller and a heat supply pipeline;
the controller is respectively and electrically connected with the heating device, the heat storage water pump, the first temperature sensor and the second temperature sensor;
the heating device outlet is connected with the heat storage device inlet through the heating pipeline, and the heat storage device outlet is connected with the heating device inlet through the heating pipeline; the heat storage water pump is connected to the heat supply pipeline between the outlet of the heat storage device and the inlet of the heating device; the first temperature sensor is arranged in the heat supply pipeline at one side of the outlet of the heat storage device, and the second temperature sensor is arranged in the heat supply pipeline at one side of the outlet of the heating device;
the controller obtains the temperature of the heat storage medium at the inlet of the heating device through the first temperature sensor; the controller acquires the temperature of the heat storage medium at the outlet of the heating device through the second temperature sensor; the controller compares and calculates the difference value between the temperature of the heat storage medium at the outlet of the heating device and the temperature of the heat storage medium at the inlet of the heating device with the difference value between the temperature of the heat storage medium at the outlet of the heat storage device and the threshold value temperature to obtain a flow control coefficient; when the flow control coefficient is trending toward 1 but not less than 1, the controller controls the flow rate of the heat storage water pump according to the flow control coefficient, the flow rate of the heat storage medium flowing from the heating device to the heat storage device is changed, so that the temperature of the heat storage medium in the heat storage device gradually reaches a threshold temperature;
the controller is used for:
according to
The flow control coefficient is calculated and obtained,
wherein S represents the flow control coefficient, T represents the threshold temperature of the heat storage device, and
representing the temperature of the heat accumulating medium at the outlet of the heating device, said +.>
Representing the temperature of the thermal storage medium at the inlet of the heating device;
according to
Calculating to obtain the flow of the heat accumulating water pump,
wherein G represents the flow rate of the heat storage water pump, and the unit is t/h; q represents the heat storage power of the heating device, and the unit is W; the said
Representing the temperature difference of the heat storage medium at the water inlet and the water outlet of the heating device,
unit of c.
6. A heating system as claimed in claim 5, wherein the controller is configured to:
according to
Calculating to obtain the volume of the heat storage medium in the heat storage device,
wherein V represents the volume of a heat storage medium in the heat storage device, M represents the heat of a preset heat supply demand, C represents the specific heat capacity of the heat storage medium, ρ represents the density of the heat storage medium, and
representing an initial temperature of the thermal storage medium; the heat of the preset heat supply demand is the total heat demand for heat storage of the heat storage medium in the heat storage device in the peak electricity period.
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| CN110285482B (en) * | 2019-07-05 | 2021-02-02 | 珠海格力电器股份有限公司 | Heat storage control method and device of heat storage type heating equipment and readable storage medium |
| CN110926023B (en) * | 2019-12-04 | 2021-01-15 | 珠海格力电器股份有限公司 | Heating system and control method thereof |
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