Control method and device of gas heating equipment, controller and gas heating equipment

Abstract

The invention relates to the technical field of heating equipment, and discloses a control method and device of gas heating equipment, a controller and the gas heating equipment. In response to the fact that the gas heating equipment is switched from a flameout state to a combustion state, if the set heating water outlet temperature is larger than the first temperature, the gas heating equipment is switched to the combustion state; if yes, the gas heating equipment is controlled to operate with the set heating water outlet temperature as the target heating water outlet temperature and reach the first preset duration, and the set heating water outlet temperature is the heating water outlet temperature set based on the heating requirement; and after the gas heating equipment operates by taking the set heating water outlet temperature as the target heating water outlet temperature for a first preset duration, the gas heating equipment is controlled to operate by taking the preset heating water outlet temperature as the target heating water outlet temperature. Therefore, smoke leakage caused by the fact that condensate water in the water seal device is completely evaporated is avoided, after the condensate water in the water seal device is evaporated, the condensate water in the water seal device is supplemented to maintain the amount of the condensate water in the water seal device, and the sealing effect of the water seal device on smoke is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of heating equipment technology, and in particular to a control method, device, controller, and gas heating equipment for gas heating. Background Technology

[0002] Condensing gas-fired heating and hot water boilers improve thermal efficiency by absorbing the latent heat of high-temperature flue gas through a condensing heat exchanger. Simultaneously, condensate flows into a water seal device, and when a certain amount of condensate is reached, it is discharged into the indoor sewer system. To prevent flue gas from escaping into the room through the water seal device during operation, water needs to be added to the water seal device before using the boiler. However, under conditions with a high set heating outlet temperature, the combustion load of the equipment is large, and the flue gas temperature is too high. This results in poor or even no condensation of water vapor in the flue gas, and the condensate in the water seal device gradually evaporates due to the high temperature, causing the condensate in the water seal device to gradually decrease. This weakens the sealing effect of the water seal device on the flue gas, leading to flue gas leakage and posing a safety hazard. Summary of the Invention

[0003] The first technical problem solved by this invention is to provide a control method for gas-fired heating equipment, which effectively solves the problem of weakened sealing effect of the water seal device on flue gas in condensing gas-fired heating water boilers under high set temperature conditions.

[0004] The second technical problem solved by this invention is to provide a gas-fired heating device that effectively solves the problem of weakened sealing effect of the water seal device on flue gas in condensing gas-fired heating water boilers under high set temperature conditions.

[0005] The third technical problem solved by this invention is to provide a controller for a gas-fired heating device that effectively addresses the issue of weakened sealing of flue gas by the water seal device in a condensing gas-fired heating water boiler under conditions of higher set temperatures.

[0006] The fourth technical problem solved by this invention is to provide a gas-fired heating device that effectively solves the problem of weakened sealing effect of the water seal device on flue gas in condensing gas-fired heating water boilers under high set temperature conditions.

[0007] The first technical problem mentioned above is solved by the following technical solution: A control method for a gas-fired heating system, the gas-fired heating system including a condensing heat exchanger and a water seal device, wherein the condensate outlet of the condensing heat exchanger is connected to the water seal device; the method includes: In response to the gas heating equipment switching from the flameout state to the combustion state, if the set heating outlet water temperature of the gas heating equipment is greater than the first temperature, the gas heating equipment is controlled to operate at the set heating outlet water temperature as the target heating outlet water temperature and reach the first preset time. Here, the set heating outlet water temperature is the heating outlet water temperature set based on the heating demand, and the first preset time is used to characterize the time required for the condensate in the water seal device of the gas heating equipment to evaporate and for the flue gas to leak out from the water seal device. After the gas heating equipment has been running at the set heating outlet temperature for a first preset time, the gas heating equipment is controlled to run at the preset heating outlet temperature. Wherein, the preset heating outlet temperature is less than or equal to the first temperature and greater than or equal to the second temperature, and the heating outlet temperature of the gas heating equipment is greater than or equal to the second temperature and less than or equal to the first temperature, the rate at which the condenser heat exchanger produces condensate is greater than the rate at which the condensate evaporates from the water seal device.

[0008] Compared with the prior art, the control method of the gas heating equipment of the present invention has the following advantages: By setting a heating outlet water temperature range that is less than or equal to a first temperature and greater than or equal to a second temperature, at a preset heating outlet water temperature within the heating outlet water temperature range, due to the fixed supply and return water temperature difference, the lower heating outlet water temperature reduces the combustion load of the gas heating equipment, and the return water temperature can be controlled to be near the water vapor dew point temperature in the flue gas, thereby increasing the rate at which the condenser heat exchanger produces condensate, making the rate at which the condenser heat exchanger produces condensate greater than the rate at which the condensate evaporates in the water seal device, thus achieving the replenishment of condensate in the water seal device. Therefore, during the operation of gas-fired heating equipment, when the set heating outlet water temperature is higher than the first temperature, the return water temperature is too high, which is not conducive to the condensation of water vapor in the flue gas. This results in the rate at which the condenser heat exchanger produces condensate being less than the rate at which the water seal evaporates. In this case, the duration for which the gas-fired heating equipment operates at the set heating outlet water temperature is limited to a first preset duration to prevent all the condensate in the water seal from evaporating after the first preset duration, thus preventing flue gas leakage. Furthermore, after the duration of operation at the set heating outlet water temperature reaches the first preset duration, the gas-fired heating equipment is controlled to operate at the preset heating outlet water temperature. At this time, the return water temperature can be controlled to be near the dew point temperature of water vapor in the flue gas, so that the rate at which the condenser heat exchanger produces condensate is greater than the rate at which the water seal evaporates. Thus, after the condensate in the water seal evaporates, the condensate in the water seal is replenished to maintain the amount of condensate in the water seal, ensuring the sealing effect of the water seal on the flue gas.

[0009] In one embodiment, after controlling the gas heating equipment to operate at a preset heating outlet water temperature as the target heating outlet water temperature, the method further includes: If the gas heating equipment operates at the preset heating outlet temperature for a period of time until the second preset time is reached, the process returns to the step of controlling the gas heating equipment to operate at the set heating outlet temperature for a period of time until the first preset time is reached. The second preset time is used to characterize the time required to replenish the condensate in the water seal device of the gas heating equipment to prevent flue gas from leaking out of the water seal device.

[0010] In one embodiment, the method further includes: When the gas heating equipment is controlled to operate at the set heating outlet water temperature as the target heating outlet water temperature, the first running time of the gas heating equipment operating at the set heating outlet water temperature as the target heating outlet water temperature is accumulated. When the gas heating equipment operates at the preset heating outlet temperature for a second preset duration, the accumulated first operating time will be reset to zero.

[0011] In one embodiment, the method further includes: In response to the gas heating equipment switching from a power-off state to a flameout state and then back to a combustion state, if the set heating outlet water temperature is higher than the first temperature, the gas heating equipment is controlled to operate at the preset heating outlet water temperature as the target heating outlet water temperature. If the gas heating equipment operates at the preset heating outlet water temperature for a period of time that reaches the second preset time, then the gas heating equipment will be controlled to operate at the set heating outlet water temperature as the target heating outlet water temperature.

[0012] In one embodiment, the method further includes: In response to the gas heating equipment switching from the flameout state to the combustion state, and the standby time of the gas heating equipment in the flameout state being greater than or equal to the third preset time, if the set heating outlet water temperature is greater than the first temperature, the gas heating equipment is controlled to operate at the preset heating outlet water temperature as the target heating outlet water temperature. If the gas heating equipment operates at the preset heating outlet water temperature for a period of time that reaches the second preset time, then the gas heating equipment will be controlled to operate at the set heating outlet water temperature as the target heating outlet water temperature.

[0013] In one embodiment, after controlling the gas-fired heating equipment to operate at a set heating outlet temperature as the target heating outlet temperature, the method further includes: If the gas heating equipment operates at the set heating outlet temperature as the target heating outlet temperature for a period of time that reaches the first preset time, then return to the step of controlling the gas heating equipment to operate at the preset heating outlet temperature as the target heating outlet temperature.

[0014] In one embodiment, the method further includes: If the set heating outlet water temperature is less than or equal to the first temperature and greater than or equal to the second temperature, the gas heating equipment will be controlled to operate at the set heating outlet water temperature as the target heating outlet water temperature.

[0015] The second technical problem mentioned above is solved by the following technical solution: A control device for a gas-fired heating system, the gas-fired heating system including a condenser heat exchanger and a water seal device, wherein the condensate outlet of the condenser heat exchanger is connected to the water seal device; the device includes: The first control module is used to respond to the gas heating equipment switching from the flameout state to the combustion state. If the set heating water temperature of the gas heating equipment is greater than the first temperature, the gas heating equipment is controlled to operate at the set heating water temperature as the target heating water temperature and reach the first preset time. The set heating water temperature is the heating water temperature set based on the heating demand. The first preset time is used to characterize the time required for the condensate in the water seal device of the gas heating equipment to evaporate and for the flue gas to leak out from the water seal device. The second control module is used to control the gas heating equipment to operate at the preset heating outlet temperature after the gas heating equipment has been running at the set heating outlet temperature as the target heating outlet temperature for a first preset time. The preset heating outlet temperature is less than or equal to the first temperature and greater than or equal to the second temperature. When the heating outlet temperature of the gas heating equipment is greater than or equal to the second temperature and less than or equal to the first temperature, the rate at which the condenser heat exchanger produces condensate is greater than the rate at which the condensate evaporates from the water seal device.

[0016] The third technical problem mentioned above is solved by the following technical solution: A controller for a gas-fired heating system includes: The system includes a memory and a processor, which are interconnected and communicate with each other. The memory stores computer instructions, and the processor executes these computer instructions to perform the control method for the gas heating equipment as described in any of the above embodiments.

[0017] The fourth technical problem mentioned above is solved by the following technical solution: A gas-fired heating device includes a controller, a condensing heat exchanger, and a water seal device; In this embodiment, the condensate outlet of the condensing heat exchanger is connected to the water seal device, and the controller is used to execute the control method of the gas heating equipment as described in any of the above embodiments. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the gas heating equipment provided in an embodiment of the present invention; Figure 2 This is a flowchart illustrating a control method for a gas-fired heating device provided in an embodiment of the present invention; Figure 3 This is a flowchart illustrating a control method for a gas-fired heating device provided in an embodiment of the present invention; Figure 4 This is a flowchart illustrating a control method for a gas-fired heating device provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a control device for a gas heating system provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of a controller for a gas heating device provided in an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures: 1. Condensing heat exchanger; 2. Water seal device; 3. Water seal connecting pipe; 4. Burner. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0023] Condensing gas-fired heating and hot water boilers improve thermal efficiency by absorbing the latent heat of high-temperature flue gas through a condensing heat exchanger. Simultaneously, condensate flows into a water seal device, and when a certain amount of condensate is reached, it is discharged into the indoor sewer system. To prevent flue gas from escaping into the room through the water seal device during operation, water needs to be added to the water seal device before using the boiler. However, under conditions with a high set heating outlet temperature, the combustion load of the equipment is large, and the flue gas temperature is too high. This results in poor or even no condensation of water vapor in the flue gas, and the condensate in the water seal device gradually evaporates due to the high temperature, causing the condensate in the water seal device to gradually decrease. This weakens the sealing effect of the water seal device on the flue gas, leading to flue gas leakage and posing a safety hazard.

[0024] To address the aforementioned technical problems, this invention provides a control method for a gas-fired heating system. By setting a heating outlet water temperature range that is less than or equal to a first temperature and greater than or equal to a second temperature, and within a preset heating outlet water temperature range, the lower heating outlet water temperature reduces the combustion load of the gas-fired heating system due to the fixed supply and return water temperature difference. The return water temperature can be controlled to be near the dew point temperature of water vapor in the flue gas, thereby increasing the rate at which the condenser heat exchanger produces condensate. This rate of condensate production is greater than the rate of condensate evaporation in the water seal device, thus replenishing the condensate in the water seal device. Therefore, during the operation of gas-fired heating equipment, when the set heating outlet water temperature is higher than the first temperature, the return water temperature is too high, which is not conducive to the condensation of water vapor in the flue gas. This results in the rate at which the condenser heat exchanger produces condensate being less than the rate at which the water seal evaporates. In this case, the duration for which the gas-fired heating equipment operates at the set heating outlet water temperature is limited to a first preset duration to prevent all the condensate in the water seal from evaporating after the first preset duration, thus preventing flue gas leakage. Furthermore, after the duration of operation at the set heating outlet water temperature reaches the first preset duration, the gas-fired heating equipment is controlled to operate at the preset heating outlet water temperature. At this time, the return water temperature can be controlled to be near the dew point temperature of water vapor in the flue gas, so that the rate at which the condenser heat exchanger produces condensate is greater than the rate at which the water seal evaporates. Thus, after the condensate in the water seal evaporates, the condensate in the water seal is replenished to maintain the amount of condensate in the water seal, ensuring the sealing effect of the water seal on the flue gas.

[0025] The following is combined Figures 1 to 6 The following describes embodiments of the present invention.

[0026] According to an embodiment of the present invention, a gas-fired heating device is provided. Figure 1 This is a structural schematic diagram of the gas heating equipment provided in an embodiment of the present invention, as shown below. Figure 1As shown, the gas heating equipment is a condensing gas heating equipment, including a condensing heat exchanger 1 and a water seal device 2. The condensate outlet of the condensing heat exchanger 1 is connected to the water seal device 2.

[0027] In one embodiment, such as Figure 1 As shown, the gas heating equipment also includes a water seal connection pipe 3. One end of the water seal connection pipe 3 is connected to the condensate outlet of the condensing heat exchanger 1, and the other end is connected to the water seal device 2, so as to introduce the condensate generated in the condensing heat exchanger 1 into the water seal device 2.

[0028] In one embodiment, such as Figure 1 As shown, the gas heating equipment also includes a burner 4, which is connected to a condensing heat exchanger 1. The high-temperature flue gas generated after the fuel in the burner 4 is burned enters the condensing heat exchanger 1, where heat exchange takes place and condensate is produced.

[0029] According to an embodiment of the present invention, in another aspect, a control method for a gas-fired heating device is provided, which can be applied to, for example... Figure 1 The condensing heating system shown. Figure 2 This is a flowchart illustrating a control method for a gas-fired heating device according to an embodiment of the present invention, as shown below. Figure 2 As shown, the method may include the following steps: Step 210: In response to the gas heating equipment switching from the flameout state to the combustion state, if the set heating outlet water temperature of the gas heating equipment is greater than the first temperature, then control the gas heating equipment to operate at the set heating outlet water temperature as the target heating outlet water temperature and reach the first preset time.

[0030] In this embodiment of the invention, the flameout state of the gas heating equipment refers to the state in which the gas heating equipment is powered on but not burning; the combustion state of the gas heating equipment refers to the working state in which the gas heating equipment is burning and heating.

[0031] In this embodiment of the invention, when the gas heating equipment switches from a flameout state to a combustion state, the set heating outlet water temperature of the gas heating equipment is obtained. This set heating outlet water temperature is based on heating requirements and is typically set by the user. If the set heating outlet water temperature is greater than a first temperature, the gas heating equipment is controlled to operate at the set heating outlet water temperature as the target heating outlet water temperature. The first temperature is the upper limit of the condensation temperature range, and the corresponding lower limit is the second temperature. When the gas heating equipment's supply water heating outlet water temperature is greater than or equal to the second temperature and less than or equal to the first temperature, the rate at which the condenser heat exchanger produces condensate is greater than the rate at which the condensate evaporates from the water seal device, thus condensate accumulates in the water seal device. For example, if the first temperature is 50°C and the second temperature is 30°C, then the condensation temperature range is [30°C, 50°C].

[0032] In this embodiment of the invention, the target heating outlet temperature of the gas heating equipment refers to the temperature that the gas heating equipment aims to achieve during the heating operation. The gas heating equipment uses the target heating outlet temperature as the heating target and adjusts the combustion load of the burner. The gas heating equipment is controlled to operate at the set heating outlet temperature as the target heating outlet temperature, that is, by adjusting the combustion load of the gas heating equipment, the water supply temperature of the gas heating equipment is adjusted to the set heating outlet temperature.

[0033] In this embodiment of the invention, when the gas-fired heating equipment operates at a set heating outlet temperature as the target heating outlet temperature, because the set heating outlet temperature is higher than a first temperature, the water vapor in the flue gas cannot condense or the condensation rate is slow. Simultaneously, the condensate in the water seal device of the gas-fired heating equipment gradually evaporates due to the high temperature, causing the rate at which the condenser heat exchanger produces condensate to be less than the evaporation rate of the condensate in the water seal device, resulting in a gradual decrease in the condensate in the water seal device. To prevent the condensate in the water seal device from running out and losing its sealing effect on the flue gas, the duration for which the gas-fired heating equipment operates at the set heating outlet temperature as the target heating outlet temperature is controlled to a first preset duration.

[0034] In one embodiment, the first and second temperatures corresponding to the gas heating equipment, i.e., the condensing temperature range, can be selected based on factors such as the model design of the gas heating equipment. Correspondingly, the preset heating outlet temperature can also be selected based on factors such as the model design of the gas heating equipment. For example, for gas heating equipment with strong condensing capacity, a preset heating outlet temperature closer to the first temperature can be selected, thereby reducing the difference between the preset heating outlet temperature and the set heating outlet temperature to meet the user's heating needs. Optionally, a mapping relationship between the condensing temperature range, the preset heating outlet temperature, and the model design can be established in advance for different models of gas heating equipment and different usage environments. During use, the corresponding condensing temperature range and preset heating outlet temperature can be selected according to the current model design of the gas heating equipment.

[0035] In one embodiment, when controlling the gas heating equipment to operate at a set heating outlet water temperature as the target heating outlet water temperature, the first operating time of the gas heating equipment operating at the set heating outlet water temperature as the target heating outlet water temperature is accumulated. The first operating time can be the cumulative duration of multiple consecutive workflows of the gas heating equipment operating at the set heating outlet water temperature as the target heating outlet water temperature. If, before the current workflow of the gas heating equipment operating at the set heating outlet water temperature as the target heating outlet water temperature, there were one or more workflows operating at the set heating outlet water temperature as the target heating outlet water temperature, for example, if the user paused or turned off the gas heating equipment during its operation and then restarted it, then during the current operation of the gas heating equipment operating at the set heating outlet water temperature as the target heating outlet water temperature, the timing continues based on the first operating time accumulated before the current moment, thereby timing the time for condensate to be consumed in the water seal device to determine the consumption of condensate in the water seal device.

[0036] Step 220: After the gas heating equipment has been running at the set heating outlet water temperature for the first preset time, control the gas heating equipment to run at the preset heating outlet water temperature.

[0037] In this embodiment of the invention, after the gas-fired heating equipment has operated at a set heating outlet water temperature as the target heating outlet water temperature for a first preset time, the gas-fired heating equipment is controlled to operate at the preset heating outlet water temperature as the target heating outlet water temperature. The preset heating outlet water temperature is less than or equal to a first temperature and greater than or equal to a second temperature, meaning the preset temperature is within the condensation temperature range. When the gas-fired heating equipment operates at the preset heating outlet water temperature as the target heating outlet water temperature, the rate at which the condenser heat exchanger generates condensate is greater than the rate at which the condensate evaporates from the water seal device, thereby replenishing the condensate in the water seal device.

[0038] In one embodiment, after controlling the gas heating equipment to operate at a preset heating outlet temperature as the target heating outlet temperature to replenish the condensate in the water seal device, if the gas heating equipment operates at the preset heating outlet temperature as the target heating outlet temperature for a duration of a second preset duration, then the process returns to the step of controlling the gas heating equipment to operate at the set heating outlet temperature as the target heating outlet temperature for a duration of a first preset duration. This allows the system to switch to operating at the set heating outlet temperature as the target heating outlet temperature after replenishing the condensate, ensuring the heating effect of the gas heating equipment.

[0039] In one embodiment, when the gas-fired heating equipment operates at a preset heating outlet temperature for a second preset duration, the accumulated first operating time is reset to zero to restart the timing. This allows for a recalculation of condensate consumption in the water seal device after replenishment. Simultaneously, by combining the accumulated first operating time with the statistics of condensate replenishment, the consumption of condensate in the water seal device is statistically analyzed to determine the time when the condensate in the water seal device is depleted. This enables timely control of the gas-fired heating equipment to switch to the preset heating outlet temperature, ensuring timely replenishment of condensate in the water seal device and maintaining its sealing effect on the flue gas. Furthermore, the accumulated first operating time is reset only when the gas-fired heating equipment operates at the preset heating outlet temperature for a second preset duration. This prevents the gas-fired heating equipment from re-accumulating the first operating time when it enters a flameout state and then restarts combustion if the water in the water seal device is not fully replenished, thus avoiding the situation where the condensate in the water seal device is depleted due to the re-accumulation of the first operating time.

[0040] In one embodiment, a first preset duration characterizes the time required for the condensate in the water seal of the gas heating equipment to evaporate, causing flue gas to leak out of the water seal, i.e., the time required for the condensate in the water seal to completely evaporate. A second preset duration characterizes the time required for the condensate in the water seal of the gas heating equipment to replenish itself to prevent flue gas leakage, i.e., the time required for the condensate in the water seal to be completely replenished. Since the time required for the condensate to completely evaporate and the time required for the condensate to be completely replenished differ under different conditions, such as different combustion loads, the first preset duration can be set as the shortest time required for the condensate to completely evaporate, for example, the time required for complete evaporation under the highest combustion load. The second preset duration can be set as the longest time required for the condensate to be completely replenished, for example, the time required for complete replenishment under the lowest combustion load.

[0041] By using the above method, the gas heating equipment is controlled to switch between operating at the set heating outlet water temperature as the target heating outlet water temperature and operating at the preset heating outlet water temperature as the target heating outlet water temperature. This allows for timely replenishment of condensate water in the water seal device when it is consumed, and water is supplied according to user needs after the condensate water is replenished. This cycle ensures heating effect while maintaining the sealing effect of the water seal device on flue gas.

[0042] In one embodiment, Figure 3 This is a flowchart illustrating a control method for a gas-fired heating device according to an embodiment of the present invention. When the gas-fired heating device switches from a power-off state to a combustion state, the present invention employs the following... Figure 3 The workflow shown may include the following steps: Step 310: In response to the gas heating equipment switching from a power-off state to a flameout state and then back to a combustion state, if the set heating outlet water temperature is greater than the first temperature, then control the gas heating equipment to operate at the preset heating outlet water temperature as the target heating outlet water temperature.

[0043] In this embodiment of the invention, during the process of switching the gas heating equipment from a power-off state to a combustion state, the gas heating equipment first switches from a power-off state to a flameout state, and then switches from a flameout state to a combustion state. If the gas heating equipment switches from a power-off state to a flameout state and then switches from a flameout state to a combustion state, then the gas heating equipment switches from a power-off state to a combustion state. At this time, to avoid insufficient condensate in the water seal device, the gas heating equipment is first controlled to operate in the condensation zone to replenish the condensate. Specifically, if the set heating outlet water temperature is higher than a first temperature, the gas heating equipment is first controlled to operate at the preset heating outlet water temperature as the target heating outlet water temperature, and the duration of the gas heating equipment operating at the preset heating outlet water temperature as the target heating outlet water temperature is timed.

[0044] Step 320: If the gas heating equipment operates at the preset heating outlet water temperature as the target heating outlet water temperature for a period of time that reaches the second preset time, then control the gas heating equipment to operate at the set heating outlet water temperature as the target heating outlet water temperature.

[0045] In this embodiment of the invention, if the gas heating equipment operates at the preset heating outlet temperature as the target heating outlet temperature for a period of time that reaches the second preset time, it indicates that the gas heating equipment has completed the replenishment of condensate in the water seal device. At this time, the gas heating equipment is controlled to operate at the set heating outlet temperature as the target heating outlet temperature, and the first working time of operating at the set heating outlet temperature as the target heating outlet temperature is timed. Since the switch is from the preset heating outlet temperature to the set heating outlet temperature, the first working time starts to be counted from zero.

[0046] In one embodiment, after controlling the gas heating equipment to operate at the set heating outlet water temperature as the target heating outlet water temperature, if the duration of operation at the set heating outlet water temperature as the target heating outlet water temperature reaches a first preset duration, the process returns to the step of controlling the gas heating equipment to operate at the preset heating outlet water temperature as the target heating outlet water temperature, so as to replenish condensate in the water seal device in a timely manner after condensate is consumed. Through the above method, the gas heating equipment is controlled to switch between operating at the set heating outlet water temperature as the target heating outlet water temperature and operating at the preset heating outlet water temperature as the target heating outlet water temperature, thereby replenishing condensate in the water seal device in a timely manner when condensate is consumed. After the condensate is replenished, water is supplied according to user demand, and this cycle is repeated to ensure the heating effect while maintaining the sealing effect of the water seal device on the flue gas.

[0047] In one embodiment, Figure 4 This is a flowchart illustrating a control method for a gas-fired heating device according to an embodiment of the present invention. When the gas-fired heating device switches from a long-term off-state to a combustion state, the present invention employs the following... Figure 4 The workflow shown may include the following steps: Step 410: In response to the gas heating equipment switching from the flameout state to the combustion state, and the standby time of the gas heating equipment in the flameout state being greater than or equal to the third preset time, if the set heating outlet water temperature is greater than the first temperature, then control the gas heating equipment to operate at the preset heating outlet water temperature as the target heating outlet water temperature.

[0048] In this embodiment of the invention, when the gas heating equipment is in the off state, the standby time of the gas heating equipment in the off state is timed. If the standby time of the gas heating equipment reaches a third preset time, it indicates that the gas heating equipment has not been used for a long time, and there is a risk that the condensate in the water seal device will evaporate and be exhausted. Therefore, when the gas heating equipment switches from the off state to the combustion state, and the standby time of the gas heating equipment in the off state is greater than or equal to the third preset time, the gas heating equipment is first controlled to operate at the preset heating outlet water temperature as the target heating outlet water temperature. At the same time, the time for the gas heating equipment to operate at the preset heating outlet water temperature as the target heating outlet water temperature is timed, thereby controlling the gas heating equipment to work in the condensation zone to replenish the condensate.

[0049] Step 420: If the gas heating equipment operates at the preset heating outlet water temperature as the target heating outlet water temperature for a period of time that reaches the second preset time, then control the gas heating equipment to operate at the set heating outlet water temperature as the target heating outlet water temperature.

[0050] In this embodiment of the invention, if the gas heating equipment operates at the preset heating outlet temperature as the target heating outlet temperature for a period of time that reaches the second preset time, it indicates that the gas heating equipment has completed the replenishment of condensate in the water seal device. At this time, the gas heating equipment is controlled to operate at the set heating outlet temperature as the target heating outlet temperature, and the first working time of operating at the set heating outlet temperature as the target heating outlet temperature is timed. Since the switch is from the preset heating outlet temperature to the set heating outlet temperature, the first working time starts to be counted from zero.

[0051] In one embodiment, after controlling the gas heating equipment to operate at the set heating outlet water temperature as the target heating outlet water temperature, if the duration of operation at the set heating outlet water temperature as the target heating outlet water temperature reaches a first preset duration, the process returns to the step of controlling the gas heating equipment to operate at the preset heating outlet water temperature as the target heating outlet water temperature, so as to replenish condensate in the water seal device in a timely manner after condensate is consumed. Through the above method, the gas heating equipment is controlled to switch between operating at the set heating outlet water temperature as the target heating outlet water temperature and operating at the preset heating outlet water temperature as the target heating outlet water temperature, thereby replenishing condensate in the water seal device in a timely manner when condensate is consumed. After the condensate is replenished, water is supplied according to user demand, and this cycle is repeated to ensure the heating effect while maintaining the sealing effect of the water seal device on the flue gas.

[0052] In one embodiment, the above Figures 2-4 The embodiment shown is for the case where the set heating outlet water temperature is greater than the first temperature, that is, the set heating outlet water temperature exceeds the condensing temperature range. If the set heating outlet water temperature is less than or equal to the first temperature and greater than or equal to the second temperature, that is, the set heating outlet water temperature is within the condensing temperature range, then the condensate in the water seal device can be continuously replenished according to the set heating outlet water temperature. Therefore, the gas heating equipment is controlled to operate at the set heating outlet water temperature as the target temperature.

[0053] The control method for gas-fired heating equipment provided in this embodiment of the invention sets a heating outlet water temperature range that is less than or equal to a first temperature and greater than or equal to a second temperature. At a preset heating outlet water temperature within the heating outlet water temperature range, since the supply and return water temperature difference is fixed, the return water temperature can be controlled below the flue gas dew point. At the same time, the lower heating outlet water temperature reduces the combustion load of the gas-fired heating equipment, thereby reducing the flue gas temperature to near the flue gas dew point. This increases the rate at which the condenser heat exchanger produces condensate, making the rate at which the condenser heat exchanger produces condensate greater than the rate at which the condensate evaporates in the water seal device, thereby replenishing the condensate in the water seal device. Meanwhile, when the set heating outlet water temperature of the gas heating equipment is higher than the first temperature, the duration for which the gas heating equipment operates at the set heating outlet water temperature as the target heating outlet water temperature is limited to a first preset duration. This prevents all the condensate in the water seal device from evaporating after the first preset duration, thus avoiding flue gas leakage. Furthermore, after the duration for which the gas heating equipment operates at the set heating outlet water temperature as the target heating outlet water temperature reaches the first preset duration, the gas heating equipment is controlled to operate at the preset heating outlet water temperature as the target heating outlet water temperature. This replenishes the condensate in the water seal device after it evaporates, maintaining the amount of condensate in the water seal device and ensuring the sealing effect of the water seal device on the flue gas.

[0054] According to an embodiment of the present invention, in another aspect, a control device for a gas-fired heating system is also provided, which can be applied to, for example... Figure 1In the condensing heating system shown. For example... Figure 5 As shown, the device includes: The first control module 510 is used to respond to the gas heating equipment switching from the flameout state to the combustion state. If the set heating water temperature of the gas heating equipment is greater than the first temperature, the gas heating equipment is controlled to operate at the set heating water temperature as the target heating water temperature and reach the first preset time. The set heating water temperature is the heating water temperature set based on the heating demand. The first preset time is used to characterize the time required for the condensate in the water seal device of the gas heating equipment to evaporate and for the flue gas to leak out from the water seal device. The second control module 520 is used to control the gas heating equipment to operate at the preset heating outlet temperature after the gas heating equipment has been running at the set heating outlet temperature as the target heating outlet temperature for a first preset time. The preset heating outlet temperature is less than or equal to the first temperature and greater than or equal to the second temperature. When the heating outlet temperature of the gas heating equipment is greater than or equal to the second temperature and less than or equal to the first temperature, the rate at which the condenser heat exchanger generates condensate is greater than the rate at which the condensate evaporates from the water seal device.

[0055] In one embodiment, the device further includes: The first control module 510 is further configured to, if the gas heating equipment operates at the preset heating outlet water temperature as the target heating outlet water temperature for a period of time that reaches a second preset time, return to execute the step of controlling the gas heating equipment to operate at the set heating outlet water temperature as the target heating outlet water temperature for a period of time that reaches a first preset time. The second preset time is used to characterize the time required to replenish the condensate in the water seal device of the gas heating equipment to prevent flue gas from leaking out of the water seal device.

[0056] In one embodiment, the device further includes: The runtime accumulation module is used to accumulate the first runtime of the gas heating equipment when it is controlled to run at the set heating outlet water temperature as the target heating outlet water temperature. The runtime reset module is used to reset the accumulated first runtime when the gas heating equipment has been running for a second preset time at the target heating outlet temperature.

[0057] In one embodiment, the device further includes: The second control module 520 is also used to respond to the gas heating equipment switching from a power-off state to a flameout state and from a flameout state to a combustion state. If the set heating outlet water temperature is greater than the first temperature, the gas heating equipment is controlled to operate at the preset heating outlet water temperature as the target heating outlet water temperature. The first control module 510 is also used to control the gas heating equipment to operate at the set heating outlet temperature if the duration of operation of the gas heating equipment at the preset heating outlet temperature as the target heating outlet temperature reaches a second preset duration.

[0058] In one embodiment, the device further includes: The second control module 520 is also used to respond to the gas heating equipment switching from the flameout state to the combustion state, and the standby time of the gas heating equipment in the flameout state is greater than or equal to the third preset time. If the set heating outlet water temperature is greater than the first temperature, the gas heating equipment is controlled to operate at the preset heating outlet water temperature as the target heating outlet water temperature. The first control module 510 is also used to control the gas heating equipment to operate at the set heating outlet temperature if the duration of operation of the gas heating equipment at the preset heating outlet temperature as the target heating outlet temperature reaches a second preset duration.

[0059] In one embodiment, the device further includes: The second control module 520 is also used to return to the step of controlling the gas heating equipment to run at the preset heating outlet temperature if the duration of operation of the gas heating equipment at the set heating outlet temperature as the target heating outlet temperature reaches a first preset duration.

[0060] In one embodiment, the device further includes: The first control module 510 is also used to control the gas heating equipment to operate at the set heating outlet temperature as the target heating outlet temperature if the set heating outlet temperature is less than or equal to the first temperature and greater than or equal to the second temperature.

[0061] Further functional descriptions of the above modules and units are the same as those in the corresponding embodiments described above, and will not be repeated here.

[0062] In this embodiment, the control device of the gas heating equipment is presented in the form of a functional unit. Here, a unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0063] According to an embodiment of the present invention, in another aspect, a controller for a gas heating device is also provided, having the above-described... Figure 5 The control device for the gas heating equipment shown.

[0064] Figure 6 This is a schematic diagram of the structure of a controller for a gas-fired heating device provided in an embodiment of the present invention, as shown below. Figure 6 As shown, the controller of this gas heating equipment includes one or more processors 10, a memory 20, and interfaces for connecting the various components, including high-speed interfaces and low-speed interfaces. The various components communicate with each other via different buses and can be mounted on a common motherboard or otherwise installed as needed. The processor can process instructions executed within the computer device, including instructions stored in or on memory to display graphical information of a GUI on an external input / output device (such as a display device coupled to the interface). In some alternative implementations, multiple processors and / or multiple buses can be used with multiple memories and multiple memory modules, if desired. Similarly, multiple computer devices can be connected, each providing some of the necessary operations (e.g., as a server array, a group of blade servers, or a multiprocessor system). Figure 6 Take a processor 10 as an example.

[0065] Processor 10 may be a central processing unit, a network processor, or a combination thereof. Processor 10 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The programmable logic device may be a complex programmable logic device (CAMP), a field-programmable gate array (FPGA), a general-purpose array logic (GDA), or any combination thereof.

[0066] The memory 20 stores instructions executable by at least one processor 10 to cause at least one processor 10 to perform the method shown in the above embodiments.

[0067] The memory 20 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the computer device. Furthermore, the memory 20 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some alternative embodiments, the memory 20 may optionally include memory remotely located relative to the processor 10, which can be connected to the controller of the gas heating equipment via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0068] The memory 20 may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as flash memory, hard disk or solid-state drive; the memory 20 may also include a combination of the above types of memory.

[0069] The controller of the gas heating equipment also includes a communication interface 30 for communicating with other devices or communication networks.

[0070] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0071] The specific embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A control method for a gas-fired heating device, the gas-fired heating device comprising a condensing heat exchanger and a water seal device, wherein the condensate outlet of the condensing heat exchanger is connected to the water seal device; characterized in that, The method includes: In response to the gas heating equipment switching from a flameout state to a combustion state, if the set heating outlet water temperature of the gas heating equipment is greater than a first temperature, the gas heating equipment is controlled to operate at the set heating outlet water temperature as the target heating outlet water temperature for a first preset time; wherein, the set heating outlet water temperature is a heating outlet water temperature set based on heating demand, and the first preset time is used to characterize the time required for the condensate in the water seal device of the gas heating equipment to evaporate, causing the flue gas to leak out from the water seal device; After the gas-fired heating equipment has been running at the set heating outlet temperature as the target heating outlet temperature for the first preset time, the gas-fired heating equipment is controlled to run at the preset heating outlet temperature as the target heating outlet temperature; wherein, when the preset heating outlet temperature is less than or equal to the first temperature and greater than or equal to the second temperature, and when the heating outlet temperature of the gas-fired heating equipment is greater than or equal to the second temperature and less than or equal to the first temperature, the rate at which the condenser heat exchanger produces condensate is greater than the rate at which the condensate evaporates from the water seal device.

2. The method according to claim 1, characterized in that, After controlling the gas heating equipment to operate at a preset heating outlet water temperature as the target heating outlet water temperature, the method further includes: If the gas heating equipment operates at the preset heating outlet temperature as the target heating outlet temperature for a period of time that reaches the second preset time, the process returns to the step of controlling the gas heating equipment to operate at the set heating outlet temperature as the target heating outlet temperature for a period of time that reaches the first preset time. The second preset time is used to characterize the time required to replenish the condensate in the water seal device of the gas heating equipment to prevent flue gas from leaking out of the water seal device.

3. The method according to claim 2, characterized in that, The method further includes: When the gas heating equipment is controlled to operate at the set heating outlet water temperature as the target heating outlet water temperature, the first operating time of the gas heating equipment operating at the set heating outlet water temperature as the target heating outlet water temperature is accumulated. When the gas heating equipment operates at the preset heating outlet temperature for a second preset duration, the accumulated first operating duration is reset to zero.

4. The method according to claim 1, characterized in that, The method further includes: In response to the gas heating equipment switching from a power-off state to a flameout state and then switching from a flameout state to a combustion state, if the set heating outlet water temperature is greater than the first temperature, the gas heating equipment is controlled to operate at the preset heating outlet water temperature as the target heating outlet water temperature. If the gas heating equipment operates at the preset heating outlet temperature as the target heating outlet temperature for a period of time that reaches a second preset time, then the gas heating equipment is controlled to operate at the set heating outlet temperature as the target heating outlet temperature.

5. The method according to claim 1, characterized in that, The method further includes: In response to the gas heating equipment switching from a flameout state to a combustion state, and the standby time of the gas heating equipment in the flameout state being greater than or equal to a third preset time, if the set heating outlet water temperature is greater than the first temperature, then the gas heating equipment is controlled to operate at the preset heating outlet water temperature as the target heating outlet water temperature. If the gas heating equipment operates at the preset heating outlet temperature as the target heating outlet temperature for a period of time that reaches a second preset time, then the gas heating equipment is controlled to operate at the set heating outlet temperature as the target heating outlet temperature.

6. The method according to claim 4 or 5, characterized in that, After controlling the gas-fired heating equipment to operate at the set heating outlet water temperature as the target heating outlet water temperature, the method further includes: If the gas heating equipment operates at the set heating outlet water temperature as the target heating outlet water temperature for a period of time that reaches the first preset time, then return to the step of controlling the gas heating equipment to operate at the preset heating outlet water temperature as the target heating outlet water temperature.

7. The method according to any one of claims 1-6, characterized in that, The method further includes: If the set heating outlet water temperature is less than or equal to the first temperature and greater than or equal to the second temperature, then the gas heating equipment is controlled to operate at the set heating outlet water temperature as the target heating outlet water temperature.

8. A control device for a gas-fired heating system, the gas-fired heating system comprising a condensing heat exchanger and a water seal device, wherein the condensate outlet of the condensing heat exchanger is connected to the water seal device; characterized in that, The device includes: The first control module is used to respond to the gas heating equipment switching from the flameout state to the combustion state. If the set heating outlet water temperature of the gas heating equipment is greater than the first temperature, the module controls the gas heating equipment to operate at the set heating outlet water temperature as the target heating outlet water temperature and reach the first preset time. The set heating outlet water temperature is a heating outlet water temperature set based on heating demand. The first preset time is used to characterize the time required for the condensate in the water seal device of the gas heating equipment to evaporate and for the flue gas to leak out from the water seal device. The second control module is used to control the gas heating equipment to operate at a preset heating outlet temperature after the gas heating equipment has been running at the set heating outlet temperature as the target heating outlet temperature for the first preset time. The preset heating outlet temperature is less than or equal to the first temperature and greater than or equal to the second temperature. When the heating outlet temperature of the gas heating equipment is greater than or equal to the second temperature and less than or equal to the first temperature, the rate at which the condenser heat exchanger produces condensate is greater than the rate at which the condensate evaporates from the water seal device.

9. A controller for a gas-fired heating system, characterized in that, include: The system includes a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to perform the control method of the gas heating equipment according to any one of claims 1 to 7.

10. A gas-fired heating device, characterized in that, Includes controller, condenser heat exchanger and water seal device; The condensate outlet of the condensing heat exchanger is connected to the water seal device, and the controller is used to execute the control method of the gas heating equipment according to any one of claims 1-7.

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