Heat management method and device of cogeneration device and electronic equipment

Abstract

The invention provides a heat management method and device of a combined heat and power supply device and electronic equipment, and relates to the technical field of combined heat and power supply device application, and the method comprises the steps: judging whether the combined heat and power supply device has an icing risk or not based on the current environment temperature and the water inlet temperature of the combined heat and power supply device; if the freezing risk exists, whether the combined heat and power device is frozen or not is judged according to the pipeline temperature in the combined heat and power device; and if the combined heat and power device is frozen, ice breaking treatment or icing fault alarm is carried out on the combined heat and power device according to the water pump rotating speed and the pipeline flow of the combined heat and power device, so that the technical problem that the reliability is low due to the fact that whether the combined heat and power device has the freezing risk or not is manually recognized is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of application of combined heat and power devices, and in particular to a thermal management method, device and electronic equipment for combined heat and power devices. Background Art

[0002] The ambient temperature in the north is often below 0°C in winter. When a cogeneration device installed outdoors is shut down for a long time, or the fuel cell system therein does not provide heat for a long time, there is a risk of freezing of the municipal water circuit in the cogeneration device. If the cogeneration function of the cogeneration device is started when it is frozen, the water pump, pipes and other components may be damaged.

[0003] Currently, due to the lack of freezing judgment logic, the freezing risk of cogeneration devices is often identified manually, that is, staff are required to confirm the freezing conditions of the cogeneration devices on site; however, human operating behavior is uncertain and prone to human negligence, and there is a high-voltage power supply at the installation site of the cogeneration device, which leads to many uncontrollable factors. Summary of the invention

[0004] The object of the present invention is to provide a thermal management method, device and electronic equipment for a cogeneration device, so as to alleviate the technical problem of low reliability in manually identifying whether the cogeneration device has a freezing risk.

[0005] In a first aspect, an embodiment of the present invention provides a thermal management method for a combined heat and power device, comprising:

[0006] Based on the current ambient temperature and water inlet temperature of the cogeneration device, determining whether the cogeneration device has a risk of freezing;

[0007] If the freezing risk exists, judging whether the cogeneration device is frozen according to the temperature of the pipes in the cogeneration device;

[0008] If the cogeneration device is frozen, de-icing is performed on the cogeneration device or an ice fault alarm is issued according to the water pump rotation speed and pipeline flow of the cogeneration device.

[0009] In combination with the first aspect, the embodiment of the present invention provides a first possible implementation manner of the first aspect, wherein the method further includes:

[0010] After the ice breaking process is performed, if the water inlet temperature of the cogeneration device is less than the first temperature threshold, the fuel cell system and the heater of the cogeneration device are controlled to provide corresponding heating power according to the heat generation demand of the user.

[0011] In combination with the first aspect, an embodiment of the present invention provides a second possible implementation of the first aspect, wherein the step of controlling the fuel cell system and the heater of the cogeneration device to provide corresponding heating power according to the heat generation demand of the user includes:

[0012] If the water inlet temperature of the cogeneration device is lower than the first temperature threshold, determining whether a heat generation demand of the user is received;

[0013] If not, then when the water outlet temperature of the pipeline is less than the fourth temperature threshold, the heater is controlled to turn on;

[0014] If so, when the temperature of the water outlet of the pipeline is less than the second temperature threshold and the temperature of the water tank is less than or equal to the third temperature threshold, it is determined whether the fuel cell system is turned on; if the fuel cell system is not turned on, the heater is controlled to be turned on; if the fuel cell system is turned on, the fuel cell system and the heater are controlled to perform power adjustment according to the heating power of the cogeneration device and the target power corresponding to the heat generation demand of the user;

[0015] Determine whether the water inlet temperature of the cogeneration device is less than a first temperature threshold; if so, repeat the above steps; if not, terminate the execution.

[0016] In combination with the first aspect, an embodiment of the present invention provides a third possible implementation of the first aspect, wherein if the fuel cell system is turned on, the step of controlling the fuel cell system and the heater to perform power adjustment according to the heating power of the cogeneration device and the target power corresponding to the heat generation demand of the user includes:

[0017] If the fuel cell system is turned on, the difference between the target power corresponding to the user's heat generation demand and the heating power of the cogeneration device is calculated; if the difference power is greater than or equal to a first power threshold, the heater is controlled to be turned on and the heating power of the fuel cell system is increased; if the difference power is less than a second power threshold, the heater is controlled to be turned off and the heating power of the fuel cell system is reduced.

[0018] In combination with the first aspect, an embodiment of the present invention provides a fourth possible implementation of the first aspect, wherein if the cogeneration device is frozen, the step of performing ice breaking processing or ice fault alarm on the cogeneration device according to the water pump speed and pipeline flow of the cogeneration device includes:

[0019] In the case where the cogeneration device is frozen, comparing the water pump speed with a first speed threshold;

[0020] According to the comparison result and the water inlet pipeline flow of the cogeneration device, an icing fault alarm is issued to the cogeneration device, and the heater and the water pump are controlled to break the ice of the cogeneration device.

[0021] In combination with the first aspect, an embodiment of the present invention provides a fifth possible implementation of the first aspect, wherein, according to the comparison result and the water inlet pipeline flow of the cogeneration device, an icing fault alarm is issued to the cogeneration device, and the heater and the water pump are controlled to perform ice breaking processing on the cogeneration device, including:

[0022] If the speed of the water pump is less than or equal to a first speed threshold, the flow rate of the water inlet pipeline of the cogeneration device is compared with a first flow rate threshold; if the flow rate of the water inlet pipeline is greater than the first flow rate threshold, the water pump is controlled to stop and it is determined that the water pump is frozen; if the flow rate of the water inlet pipeline is less than or equal to the first flow rate threshold, the water pump is controlled to stop and it is determined that both the water pump and the pipeline of the cogeneration device are frozen;

[0023] If the water pump speed is greater than the first speed threshold, the water inlet pipe flow of the cogeneration device is compared with the second flow threshold, the third flow threshold and the fourth flow threshold respectively; if the water inlet pipe flow is less than the second flow threshold and the water inlet pipe flow is greater than the third flow threshold, the ice breaking process is performed by turning on the heater and controlling the water pump to work at a preset time interval; if the water inlet pipe flow is greater than the second flow threshold and the water inlet pipe flow is less than the fourth flow threshold, the ice breaking process is performed by turning on the heater or the fuel cell system and controlling the water pump to work continuously; wherein the fourth flow threshold is greater than the second flow threshold, and the second flow threshold is greater than the third flow threshold.

[0024] In combination with the first aspect, an embodiment of the present invention provides a sixth possible implementation of the first aspect, wherein the step of judging whether the cogeneration device is frozen according to the pipe temperature in the cogeneration device includes:

[0025] If the current ambient temperature of the cogeneration device and the water tank temperature in the cogeneration device are both lower than a second temperature threshold, an icing warning of the cogeneration device is issued;

[0026] If the temperature of each pipeline in the combined heat and power device is less than the third temperature threshold, it is determined that the combined heat and power device is frozen.

[0027] In a second aspect, an embodiment of the present invention further provides a thermal management device for a combined heat and power device, comprising:

[0028] a risk judgment module, for judging whether the cogeneration device has a risk of freezing based on the current ambient temperature and water inlet temperature of the cogeneration device;

[0029] an icing judgment module, which judges whether the cogeneration device is frozen according to the temperature of the pipes in the cogeneration device if the icing risk exists;

[0030] The ice-breaking processing module performs ice-breaking processing on the cogeneration device or generates an ice fault alarm according to the water pump speed and pipeline flow of the cogeneration device if the cogeneration device is frozen.

[0031] In a third aspect, an embodiment provides an electronic device, including a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and when the processor executes the computer program, the steps of the method described in any of the aforementioned implementation methods are implemented.

[0032] In a fourth aspect, an embodiment provides a machine-readable storage medium, wherein the machine-readable storage medium stores machine-executable instructions. When the machine-executable instructions are called and executed by a processor, the machine-executable instructions prompt the processor to implement the steps of the method described in any one of the aforementioned implementations.

[0033] The embodiment of the present invention provides a thermal management method, device and electronic equipment for a cogeneration device. Combined with the current ambient temperature and water inlet temperature of the cogeneration device, it is first determined whether the cogeneration device has a risk of freezing. If so, on this basis, it is further determined whether the device is frozen based on the pipeline temperature of the cogeneration device, thereby improving the reliability of the ice determination of the cogeneration device; if the device is in a frozen state, according to the water pump speed and pipeline flow of the cogeneration device, a corresponding ice fault alarm is issued and a corresponding ice-breaking processing method is adopted, so that the device can be restarted after the ice-breaking processing, which can effectively ensure the application safety of the cogeneration device.

[0034] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A flow chart of a thermal management method for a combined heat and power device provided in an embodiment of the present invention;

[0038] Figure 2 A flow chart of another thermal management method for a combined heat and power device provided by an embodiment of the present invention;

[0039] Figure 3 A schematic diagram of a combined heat and power generation device provided in an embodiment of the present invention;

[0040] Figure 4 A flow chart of a low temperature protection method for a combined heat and power plant provided in an embodiment of the present invention;

[0041] Figure 5 A flow chart of a low temperature operation method of a combined heat and power generation device provided in an embodiment of the present invention;

[0042] Figure 6 A schematic diagram of functional modules of a thermal management device for a combined heat and power device provided by an embodiment of the present invention;

[0043] Figure 7 A schematic diagram of the hardware architecture of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] The combined heat and power device can be installed outdoors in the community. It generates electricity through a fuel cell system supplied by new energy such as hydrogen, and the generated electricity is connected to the household power grid to reduce resource consumption and environmental pollution caused by thermal power generation. At the same time, the heat generated by the fuel cell power generation can also heat the municipal cold water to directly provide hot water for community residents, thereby achieving the effect of combined heat and power.

[0046] Since the cogeneration device is installed outdoors, it may be subject to risks such as freezing, and there is no effective solution in the current industry. Generally, when the staff predicts weather changes or confirms that the system will be shut down for a long time, they will manually cut off the water supply and water outlet of the municipal water circuit and drain the municipal water in the circuit. Before starting the device, it is determined whether the device is frozen through manual on-site judgment. If the device is frozen, it is thawed by external heating.

[0047] Based on this, an embodiment of the present invention provides a thermal management method, device and electronic equipment for a cogeneration device, which can effectively protect the safety of the equipment by judging the state of the device before startup, identifying startup risks, and confirming whether to start the device. When the cogeneration device is frozen, a fault alarm instruction is issued, and heating and water pumps are used to thaw the municipal water circuit to assist in thawing. When the function returns to normal, the device is restarted.

[0048] To facilitate understanding of this embodiment, a thermal management method for a cogeneration device disclosed in an embodiment of the present invention is first introduced in detail. The method can be applied to devices such as a controller and a control unit in the cogeneration device.

[0049] Figure 1 A flow chart of a thermal management method for a cogeneration device provided in an embodiment of the present invention.

[0050] Reference Figure 1 , the method mainly comprises the following steps:

[0051] Step S102: judging whether the cogeneration device has a risk of freezing based on the current ambient temperature and water inlet temperature of the cogeneration device.

[0052] Among them, the cogeneration device is arranged outdoors, so based on the current ambient temperature of the environment in which it is located and its inlet water temperature, it can be judged whether the current cogeneration device has a risk of freezing.

[0053] Step S104: if there is a risk of freezing, judging whether the cogeneration device is frozen according to the temperature of the pipes in the cogeneration device.

[0054] Here, in order to further ensure the reliability of ice determination of the cogeneration device, based on the existence of ice risk in the aforementioned steps, whether the device is frozen is determined again based on the outlet temperature and inlet temperature of each pipeline of the device.

[0055] Step S106: If the cogeneration device is frozen, de-icing the cogeneration device or issuing an ice fault alarm is performed according to the water pump speed and pipeline flow of the cogeneration device.

[0056] Among them, the water pump speed and pipeline flow of the cogeneration device can be controlled to break the ice and issue a corresponding fault alarm.

[0057] In a preferred embodiment of actual application, in combination with the current ambient temperature and inlet water temperature of the cogeneration device, it is first determined whether the cogeneration device has a risk of freezing. If so, on this basis, it is further determined whether the device is frozen based on the pipeline temperature of the cogeneration device, thereby improving the reliability of ice determination of the cogeneration device; if the device is in a frozen state, according to the water pump speed and pipeline flow of the cogeneration device, a corresponding ice fault alarm is issued and a corresponding ice-breaking treatment method is adopted, so that the device can be restarted after the ice-breaking treatment, which can effectively ensure the application safety of the cogeneration device.

[0058] It should be noted that the current ambient temperature of the cogeneration device, the inlet temperature and the outlet temperature of each pipeline mentioned in the above embodiment can be collected by setting sensors at corresponding positions of the cogeneration device architecture, as an optional example. Figure 2 As shown. Municipal cold water enters from the water inlet pipeline, passes through the water tank and the system water pump, flows through the heat exchanger for heating, and then is output through the water outlet pipeline; the heat generated by the fuel cell system can be transferred to the water flow in the pipeline through the heat exchanger, so that the water outlet pipeline outputs municipal hot water; wherein, a heater for providing heat is also provided in the water tank, and the water tank has the functions of storing water and heating water; sensors are respectively provided on each pipeline in the above-mentioned architecture, and the sensors include temperature sensors and flow sensors; specifically, a temperature sensor 1 is provided at the connection between the water outlet pipe and the water tank, a temperature sensor 3 is provided at the connection between the water inlet pipe and the water tank, a temperature sensor 2 is provided at the middle position of the water tank, and a temperature sensor 4 and a flow sensor 2 are also provided at the location of the water outlet pipe; a temperature sensor 5 is provided at the water inlet of the heat exchanger, and a temperature sensor 6 is provided at the water outlet of the heat exchanger; temperature sensors 7 and 8 are respectively provided in the connecting pipeline between the fuel cell system and the heat exchanger, and an ambient temperature sensor is also provided at the fuel cell system; flow sensors 1, pressure sensors 1 and pressure sensors 2 are respectively provided on both sides of the system water pump.

[0059] It can be understood that the outlet temperature and inlet temperature of each pipeline of the cogeneration device can be characterized by the temperatures collected by sensors 1-sensor 6, the temperature collected by temperature sensor 2 is used to characterize the water tank temperature, the inlet temperature is characterized by temperature sensor 5, and the pipeline outlet temperature is characterized by temperature sensor 1; the flow rate of the water inlet pipeline of the cogeneration device can be collected by flow sensor 1.

[0060] In some optional embodiments, such as Figure 3As shown, it can be determined whether the current ambient temperature collected by the ambient temperature sensor is less than or equal to the freezing risk operating temperature point, such as 2°C; if less than or equal to, the cogeneration state has a freezing risk, that is, it is necessary to trigger the low temperature protection program, which is used to further determine whether the device is frozen, and perform ice breaking processing and freezing fault alarm according to the freezing situation, such as steps S104-S106 of the aforementioned embodiment; if greater than, it is determined whether the current ambient temperature is less than or equal to the high temperature ambient temperature point, such as 10°C. If not, the current ambient temperature is high, and there is no need to trigger the low temperature protection strategy, and the device can operate normally.

[0061] In some embodiments, the low temperature protection strategy includes the steps of S104 and S106, which mainly include: Figure 4 As shown:

[0062] Step 1.1), determine whether the current ambient temperature of the cogeneration device and the water tank temperature in the cogeneration device are both less than the second temperature threshold; if so, issue an icing warning for the cogeneration device; if not, terminate the operation of the low temperature domineering program.

[0063] Among them, the temperatures collected by temperature sensor 7, temperature sensor 8 and environmental sensor respectively can be used to characterize the current ambient temperature of the cogeneration device to ensure the reliability of ice verification; here, if the current ambient temperature and the water tank temperature are not higher than the second temperature threshold (freezing condition temperature point, such as 0°C), the device is at risk of low-temperature freezing.

[0064] Step 1.2), determine whether the outlet temperature and inlet temperature of each pipeline in the cogeneration device are both less than the third temperature threshold; if so, determine that the cogeneration device is frozen; if not, terminate the operation of the low temperature domineering program.

[0065] Among them, the third temperature threshold can also be understood as the freezing condition temperature point, such as 0°C; based on the steps of the aforementioned embodiment, it can be known that if the device is at risk of freezing, and the outlet temperature and inlet temperature of each pipeline are still less than the third temperature threshold, then it can be more reliably determined that the device is in a freezing state.

[0066] Step 1.3), reporting municipal water freezing fault, and prompting whether to automatically check the freezing situation; judging whether to automatically check the freezing situation; if automatically checking, executing the following steps, namely step S106 of the aforementioned embodiment; if not, the system shuts down.

[0067] Among them, the user can interact with the control instructions according to the prompted icing and freezing conditions, and the device will determine whether to automatically check for freezing based on the user's interactive control instructions; if the user chooses not to automatically check, the device will shut down, and the user will then repair or adjust the device offline.

[0068] Step 1.4), presetting the rotation speed of the system water pump to the minimum rotation speed; in the case where the cogeneration device is frozen, determining whether the rotation speed of the water pump is less than or equal to the first rotation speed threshold;

[0069] Among them, the minimum speed can be understood as the minimum speed value at which the system water pump can work and rotate, and the speed value changes accordingly according to different models of system water pumps; the first speed threshold can be set to a first speed value of a preset proportion; for example, if the minimum speed of the sample water pump is set to 400rpm, the first speed threshold is 50% of the first speed value, that is, 200rpm.

[0070] On this basis, according to the comparison result of the water pump speed and the first speed threshold value, and the water inlet pipeline flow of the cogeneration device, the cogeneration device is given an ice fault alarm, and the heater and the water pump are controlled to break the ice of the cogeneration device, as follows:

[0071] Step 1.5), if the water pump speed is less than or equal to the first speed threshold, the water inlet pipeline flow of the cogeneration device is compared with the first flow threshold; if the water inlet pipeline flow is greater than the first flow threshold, the water pump is controlled to stop and it is determined that the water pump is frozen; if the water inlet pipeline flow is less than or equal to the first flow threshold, the water pump is controlled to stop and it is determined that both the water pump and the pipeline of the cogeneration device are frozen.

[0072] The minimum flow rate of the water pump at the minimum speed is 60L / min, and the first flow rate threshold is 20% of the minimum flow rate, i.e., 10L / min. It is understandable that, in the case where the device has been judged to be frozen, it can be determined that the water pump itself is frozen based on the speed of the water pump, and then it can be determined whether the water inlet pipeline is also frozen based on the flow rate of the water inlet pipeline.

[0073] Step 1.6), if the water pump speed is greater than the first speed threshold, the water inlet pipe flow of the cogeneration device is compared with the second flow threshold (30L / min), the third flow threshold and the fourth flow threshold respectively; if the water inlet pipe flow is less than the second flow threshold and the water inlet pipe flow is greater than the third flow threshold (15L / min), the ice breaking process is performed by turning on the heater and controlling the water pump to work at a preset time interval; if the water inlet pipe flow is greater than the second flow threshold and the water inlet pipe flow is less than the fourth flow threshold (60L / min), the ice breaking process is performed by turning on the heater or the fuel cell system and controlling the water pump to work continuously; wherein, the fourth flow threshold is greater than the second flow threshold, and the second flow threshold is greater than the third flow threshold.

[0074] Here, if the fed-back water pump speed is greater than the first speed threshold, different ice-breaking strategies are selected according to the flow rate of the water channel. When the flow rate is between 25% and 50% of the minimum flow rate (15L / min-30L / min), there is a certain flow rate in the pipeline to enable the water pump to operate, but there is ice in the pipeline. In order to prevent the water pump from being damaged by ice, the heater can be turned on and the water pump can be used to break the ice by intermittent operation. If the flow rate is greater than 50% of the minimum flow rate (30L / min), the flow rate is relatively moderate, the heater can be turned on, and the water pump can be used to continuously run the ice-breaking method. There is no need to worry about the water pump being damaged by ice. At this time, the engine heat exchange assisted ice-breaking method can also be used.

[0075] In addition, when the flow rate is at the minimum flow rate (60L / min), there is a relatively large flow rate in the pipeline to enable the water pump to operate, and ice breaking can be achieved by relying solely on this flow rate, so there is no need to control the water pump or heater to work, and the low temperature protection program can be exited. Based on the above-mentioned ice-breaking heating steps, when the temperature collected by temperature sensor 5 is ≥3°C and the temperature collected by temperature sensor 2 is ≥40°C, the water inlet temperature and the water tank temperature are relatively high, and the low temperature protection program can be exited.

[0076] Exemplarily, the low temperature protection program is mainly used to determine the freezing state of the device, and take different countermeasures according to the freezing situation. First, the real ambient temperature is determined according to the ambient temperature or the temperature of the engine coolant. If it is less than 0°C, it is determined to be a low temperature situation, and an ice warning (status prompt) is prompted. No countermeasures are taken. The freezing state of the municipal water pipeline of the device is determined again according to the temperature state collected by the temperature sensors TE1~6. Among them, the temperature threshold corresponding to the temperature sensor 1 is greater than the temperature threshold corresponding to the temperature sensor 4, and the temperature threshold corresponding to the temperature sensor 4 is greater than the temperature threshold corresponding to the temperature sensor 2. The specific state judgment is as follows:

[0077]

[0078]

[0079] In actual application, the cogeneration device that has just broken the ice after the ice breaking process in the above steps may cause the temperature of the device pipeline to drop and then freeze again due to the user's heating demand. In order to avoid this situation, as a preferred embodiment, Figure 2 As shown, it is also possible to determine whether to enter the low-temperature operation program under the control instruction of the user interaction; specifically, the low-temperature operation program can be implemented by the following steps, which can be specifically referred to Figure 5 :

[0080] Step 2.1), after the ice-breaking process, determine whether the water inlet temperature of the cogeneration device is greater than the first temperature threshold (such as 30°C); if so, the water inlet temperature is relatively high, and there is no need to worry about re-freezing, and exit the low-temperature operation program; if not, control the fuel cell system and heater of the cogeneration device to provide corresponding heating power according to the user's heat generation demand.

[0081] Step 2.2), setting the system water pump to the minimum speed, and determining whether the user's heat generation demand is received;

[0082] The user's heat generation demand may be understood as the amount of heat or thermal energy to be generated based on the user's application requirements.

[0083] Step 2.3), if not, then when the water outlet temperature of the pipeline is less than the fourth temperature threshold (40°C), control the heater to turn on and repeat step 2.1), or when the water outlet temperature of the pipeline is greater than the fourth temperature threshold (40°C), repeat step 2.1);

[0084] Step 2.4), if yes, determine whether the water outlet temperature of the pipeline is greater than or equal to the second temperature threshold (50°C);

[0085] Step 2.5), if yes, repeat step 2.1);

[0086] Step 2.6), if not, determine whether the water tank temperature is less than or equal to the third temperature threshold (40°C), if not, repeat step 2.1); if yes, determine whether the fuel cell system is turned on;

[0087] Step 2.7), if the fuel cell system is not turned on, control the heater to turn on, and repeat step 2.4);

[0088] Step 2.8), if the fuel cell system is turned on, the fuel cell system and the heater are controlled to adjust the power according to the heating power of the cogeneration device and the target power corresponding to the user's heat generation demand;

[0089] Specifically, a difference calculation is performed between the target power corresponding to the user's heat generation demand and the heating power of the cogeneration device.

[0090] Step 2.9), if the target power corresponding to the user's heat generation demand is less than 10KW, repeat step 2.1); if the target power corresponding to the user's heat generation demand is greater than or equal to 10KW, determine whether the difference power is greater than or equal to the first power threshold;

[0091] Step 3.0), if the difference power is greater than or equal to the first power threshold, control the heater to turn on and increase the heating power of the fuel cell system;

[0092] Step 3.1), if the difference power is less than the second power threshold, the heater is controlled to be turned off and the heating power of the fuel cell system is reduced.

[0093] In addition, it is determined whether the water inlet temperature of the cogeneration device is less than the first temperature threshold; if so, the above steps are repeated; if not, the execution is terminated.

[0094] Exemplarily, after exiting the low-temperature protection program of the aforementioned step, it is determined whether to enter the low-temperature operation program, and the judgment basis is that the inlet water temperature is less than 30°C. When the inlet water temperature is less than 30°C, it is determined that the water temperature stored in the water tank is insufficient. Run the system water pump (use the hot water in the water tank to maintain the temperature of the loop), and then determine whether the device is in a cogeneration heat production condition. If it is not a cogeneration heat production condition, decide whether to turn on the electric heater based on whether the pipe outlet temperature is ≥40°C. Then the water pump is at the lowest speed and continues to run until the inlet water temperature is greater than 30°C to exit the cycle. When the device is in a cogeneration heat production condition, determine whether to turn off the heater based on the pipe outlet temperature, and determine whether to heat based on the temperature of the water tank: when the water tank is ≤40°C, if the fuel cell system is not turned on, turn on the heater for heating. If the fuel cell system is on, confirm the heating and heat exchange power based on the user's water usage. The heating power is calculated as follows:

[0095] P0=C water×ρ water×(CS1÷t)×(TE7-TE6)

[0096] P=P0+P1

[0097] Puser=Cwater×ρwater×(CS2÷t)×(TE4-TE3)

[0098] Among them, P0 is the heat exchange power of the fuel cell system, P1 is the heater power, P is the heating power of the cogeneration device, Puser is the target power corresponding to the user's heat generation demand, and the heater power this time is 30kW; C is the specific heat capacity, ρ is the density, CS1 is the collected flow rate of flow sensor 1, CS2 is the collected flow rate of flow sensor 2, TE3 is the collected temperature of temperature sensor 3, TE4 is the collected temperature of temperature sensor 4, TE6 is the collected temperature of temperature sensor 6, and TE7 is the collected temperature of temperature sensor 7; t is 60s, which is used to convert the collected flow rate in L / min into L / s.

[0099] When Puser-P ≥ the first power threshold (30%×30kW), the heater is turned on and the power of the fuel cell system is increased by 30kW;

[0100] When Puser-P≤the second power threshold (-130%×30kW), the heater is turned off and the power of the fuel cell system is reduced to 1.2×Puser;

[0101] When Puser is less than 10kW, the system returns to the initial low-temperature operation state. If the temperature collected by the temperature sensor 5 is greater than 30°C, the system exits the low-temperature operation state and enters the normal operation state of the device.

[0102] The embodiment of the present invention protects the safety of equipment in a municipal water circuit in a low-temperature environment by adding a low-temperature protection & ice-breaking program and a low-temperature operation program, and adds an icing determination condition, which is simple and fast, replaces manual on-site confirmation operations, and is accurate and reliable.

[0103] like Figure 6 As shown, an embodiment of the present invention provides a thermal management device for a combined heat and power device, comprising:

[0104] a risk judgment module, for judging whether the cogeneration device has a risk of freezing based on the current ambient temperature and water inlet temperature of the cogeneration device;

[0105] an icing judgment module, which judges whether the cogeneration device is frozen according to the temperature of the pipes in the cogeneration device if the icing risk exists;

[0106] The ice-breaking processing module performs ice-breaking processing on the cogeneration device or generates an ice fault alarm according to the water pump speed and pipeline flow of the cogeneration device if the cogeneration device is frozen.

[0107] The embodiment of the present invention adds status determination, which can predict the environment in which the product is located, self-check the icing situation according to the environmental conditions, and confirm its own status. It also has a certain self-recovery ability, which can significantly improve environmental tolerance. According to the environmental conditions, protective measures are taken to prevent the occurrence of icing conditions and protect the safety of the equipment.

[0108] In some embodiments, the device is also used to, after ice breaking, if the water inlet temperature of the cogeneration device is less than a first temperature threshold, control the fuel cell system and heater of the cogeneration device to provide corresponding heating power according to the user's heat generation demand.

[0109] In some embodiments, the device is also used to, if the water inlet temperature of the cogeneration device is less than a first temperature threshold, determine whether the user's heat generation demand is received; if not, control the heater to turn on when the pipe outlet temperature is less than a fourth temperature threshold; if so, determine whether the fuel cell system is turned on when the pipe outlet temperature is less than the second temperature threshold and the water tank temperature is less than the third temperature threshold; if the fuel cell system is not turned on, control the heater to turn on; if the fuel cell system is turned on, control the fuel cell system and the heater to perform power adjustment according to the heating power of the cogeneration device and the target power corresponding to the user's heat generation demand; determine whether the water inlet temperature of the cogeneration device is less than the first temperature threshold; if so, repeat the above steps; if not, terminate execution.

[0110] In some embodiments, the device is also used to, if the fuel cell system is turned on, calculate the difference between the target power corresponding to the user's heat generation demand and the heating power of the cogeneration device; if the difference power is greater than or equal to a first power threshold, control the heater to turn on and increase the heating power of the fuel cell system; if the difference power is less than a second power threshold, control the heater to turn off and reduce the heating power of the fuel cell system.

[0111] In some embodiments, the ice-breaking processing module is also used to compare the water pump speed with a first speed threshold when the cogeneration device is frozen; based on the comparison result and the water inlet pipeline flow of the cogeneration device, an ice fault alarm is issued to the cogeneration device, and the heater and the water pump are controlled to perform ice-breaking processing on the cogeneration device.

[0112] In some embodiments, the ice-breaking processing module is also used to compare the water inlet pipeline flow of the cogeneration device with the first flow threshold if the water pump speed is less than or equal to the first speed threshold; if the water inlet pipeline flow is greater than the first flow threshold, the water pump is controlled to stop and it is determined that the water pump is frozen; if the water inlet pipeline flow is less than or equal to the first flow threshold, the water pump is controlled to stop and it is determined that the water pump and the pipelines of the cogeneration device are both frozen; if the water pump speed is greater than the first speed threshold, the water inlet pipeline flow of the cogeneration device is compared with the second flow threshold, the third flow threshold and the fourth flow threshold respectively; if the water inlet pipeline flow is less than the second flow threshold and the water inlet pipeline flow is greater than the third flow threshold, the ice-breaking processing is performed by turning on the heater and controlling the water pump to work at a preset time interval; if the water inlet pipeline flow is greater than the second flow threshold and the water inlet pipeline flow is less than the fourth flow threshold, the ice-breaking processing is performed by turning on the heater or the fuel cell system and controlling the water pump to work continuously.

[0113] In some embodiments, the icing judgment module is further used to issue an icing warning for the cogeneration device if the current ambient temperature of the cogeneration device and the water tank temperature in the cogeneration device are both lower than a second temperature threshold;

[0114] If the temperature of each pipeline in the combined heat and power device is less than the third temperature threshold, it is determined that the combined heat and power device is frozen.

[0115] An embodiment of the present invention provides an electronic device for implementing an electronic device. In this embodiment, the electronic device may be, but is not limited to, a personal computer (PC), a laptop computer, a monitoring device, a server, or other computer device with analysis and processing capabilities.

[0116] As an exemplary embodiment, see Figure 7 The electronic device 110 includes a communication interface 111, a processor 112, a memory 113 and a bus 114. The processor 112, the communication interface 111 and the memory 113 are connected via the bus 114. The memory 113 is used to store a computer program that supports the processor 112 to execute the method. The processor 112 is configured to execute the program stored in the memory 113.

[0117] The machine-readable storage medium mentioned in this article can be any electronic, magnetic, optical or other physical storage device that can contain or store information, such as executable instructions, data, etc. For example, the machine-readable storage medium can be: RAM (Radom Access Memory), volatile memory, non-volatile memory, flash memory, storage drive (such as hard disk drive), any type of storage disk (such as CD, DVD, etc.), or similar storage medium, or a combination thereof.

[0118] The non-volatile medium may be a non-volatile memory, a flash memory, a storage drive (such as a hard drive), any type of storage disk (such as a CD, DVD, etc.), or a similar non-volatile storage medium, or a combination thereof.

[0119] It can be understood that the specific operation methods of each functional module in this embodiment can refer to the detailed description of the corresponding steps in the above method embodiment, and will not be repeated here.

[0120] The computer-readable storage medium provided in the embodiment of the present invention stores a computer program. When the computer program code is executed, the method described in any of the above embodiments can be implemented. For specific implementation, please refer to the method embodiment, which will not be described in detail here.

[0121] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0122] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0123] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0124] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the aforementioned embodiments, those of ordinary skill in the art should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed by the present invention, or can easily conceive of changes, or make equivalent replacements for some of the technical features therein. Such modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the protection scope of the present invention.

Claims

1. A thermal management method for a combined heat and power device, characterized in that: include: Based on the current ambient temperature and water inlet temperature of the cogeneration device, determining whether the cogeneration device has a risk of freezing; If the freezing risk exists, judging whether the cogeneration device is frozen according to the temperature of the pipes in the cogeneration device; If the cogeneration device is frozen, de-icing is performed on the cogeneration device or an ice fault alarm is issued according to the water pump rotation speed and pipeline flow of the cogeneration device.

2. The method according to claim 1, characterized in that The method further comprises: After the ice breaking process is performed, if the water inlet temperature of the cogeneration device is less than the first temperature threshold, the fuel cell system and the heater of the cogeneration device are controlled to provide corresponding heating power according to the heat generation demand of the user.

3. The method according to claim 2, characterized in that The step of controlling the fuel cell system and the heater of the cogeneration device to provide corresponding heating power according to the heat generation demand of the user comprises: If the water inlet temperature of the cogeneration device is lower than the first temperature threshold, determining whether a heat generation demand of the user is received; If not, then when the water outlet temperature of the pipeline is less than the fourth temperature threshold, the heater is controlled to turn on; If so, when the temperature of the water outlet of the pipeline is less than the second temperature threshold and the temperature of the water tank is less than or equal to the third temperature threshold, it is determined whether the fuel cell system is turned on; if the fuel cell system is not turned on, the heater is controlled to be turned on; if the fuel cell system is turned on, the fuel cell system and the heater are controlled to perform power adjustment according to the heating power of the cogeneration device and the target power corresponding to the heat generation demand of the user; Determine whether the water inlet temperature of the cogeneration device is less than a first temperature threshold; if so, repeat the above steps; if not, terminate the execution.

4. The method according to claim 3, characterized in that If the fuel cell system is turned on, the step of controlling the fuel cell system and the heater to adjust power according to the heating power of the cogeneration device and the target power corresponding to the heat generation demand of the user includes: If the fuel cell system is turned on, the difference between the target power corresponding to the user's heat generation demand and the heating power of the cogeneration device is calculated; if the difference power is greater than or equal to a first power threshold, the heater is controlled to be turned on and the heating power of the fuel cell system is increased; if the difference power is less than a second power threshold, the heater is controlled to be turned off and the heating power of the fuel cell system is reduced.

5. The method according to claim 1, characterized in that If the cogeneration device is frozen, the steps of breaking ice or giving an ice fault alarm for the cogeneration device according to the water pump speed and pipeline flow of the cogeneration device include: In the case where the cogeneration device is frozen, comparing the water pump speed with a first speed threshold; According to the comparison result and the water inlet pipeline flow of the cogeneration device, an icing fault alarm is issued to the cogeneration device, and the heater and the water pump are controlled to break the ice of the cogeneration device.

6. The method according to claim 5, characterized in that The steps of issuing an icing fault alarm to the cogeneration device according to the comparison result and the water inlet pipeline flow of the cogeneration device, and controlling the heater and the water pump to break ice on the cogeneration device include: If the speed of the water pump is less than or equal to a first speed threshold, the flow rate of the water inlet pipeline of the cogeneration device is compared with a first flow rate threshold; if the flow rate of the water inlet pipeline is greater than the first flow rate threshold, the water pump is controlled to stop and it is determined that the water pump is frozen; if the flow rate of the water inlet pipeline is less than or equal to the first flow rate threshold, the water pump is controlled to stop and it is determined that both the water pump and the pipeline of the cogeneration device are frozen; If the water pump speed is greater than the first speed threshold, the water inlet pipe flow of the cogeneration device is compared with the second flow threshold, the third flow threshold and the fourth flow threshold respectively; if the water inlet pipe flow is less than the second flow threshold and the water inlet pipe flow is greater than the third flow threshold, the ice breaking process is performed by turning on the heater and controlling the water pump to work at a preset time interval; if the water inlet pipe flow is greater than the second flow threshold and the water inlet pipe flow is less than the fourth flow threshold, the ice breaking process is performed by turning on the heater or the fuel cell system and controlling the water pump to work continuously; wherein the fourth flow threshold is greater than the second flow threshold, and the second flow threshold is greater than the third flow threshold.

7. The method according to claim 1, characterized in that The step of judging whether the cogeneration device is frozen according to the temperature of the pipes in the cogeneration device comprises: If the current ambient temperature of the cogeneration device and the water tank temperature in the cogeneration device are both lower than a second temperature threshold, an icing warning of the cogeneration device is issued; If the temperature of each pipeline in the combined heat and power device is less than the third temperature threshold, it is determined that the combined heat and power device is frozen.

8. A thermal management device for a combined heat and power plant, characterized in that: include: a risk judgment module, for judging whether the cogeneration device has a risk of freezing based on the current ambient temperature and water inlet temperature of the cogeneration device; an icing judgment module, which judges whether the cogeneration device is frozen according to the temperature of the pipes in the cogeneration device if the icing risk exists; The ice-breaking processing module performs ice-breaking processing on the cogeneration device or generates an ice fault alarm according to the water pump speed and pipeline flow of the cogeneration device if the cogeneration device is frozen.

9. An electronic device, characterized in that: The method comprises a memory, a processor, and a program stored in the memory and capable of being run on the processor, wherein the processor implements the method according to any one of claims 1 to 7 when executing the program.

10. A computer-readable storage medium, characterized in that: The readable storage medium stores a computer program, and when the computer program is executed, the method according to any one of claims 1 to 7 is implemented.

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