Control method of self-adaptive boiler group

Abstract

The invention provides a self-adaptive boiler group control method which comprises the following steps: S1, after a heating demand signal is received, a control system starts a water pump; s2, according to a preset outdoor temperature-set temperature heat supply curve, the final target temperature and the number and number of boilers needing to be started are determined; s3, a boiler is started, the water supply temperature is corrected in time according to changes of the real-time outdoor temperature and the system temperature, supply and demand balance is ensured, and constant-temperature heat supply is achieved; and S4, after the heating demand signal is cut off, the boiler stops running, the water pump is delayed to be shut down, the running frequency of the water pump is reduced, and the water pump is shut down after the water temperature is reduced to a certain range. The method has the advantages that temperature and flow double balance of the system is guaranteed, and the boiler load is always in the optimal heat efficiency state.

Description

Technical Field

[0001] The present invention relates to the field of boiler heating, and particularly to a control method for an adaptive boiler group. Background Art

[0002] With the wide application of condensing boilers, in quite a number of domestic distributed central heating projects, generally two or more boilers are installed in the boiler room. Generally speaking, in order to ensure the optimal operation of the entire heating project, the number of boilers in the boiler room is generally set at 2 - 6, and it is generally not recommended to exceed 7. Considering the initial and final stages of heating, due to the relatively small heating load, only some of the boilers can be operated at this time, so as to avoid the situation where the boiler power is too large, like using a big horse to pull a small cart, resulting in frequent start - stop of the boiler and relatively high overall operating efficiency. When there are multiple boilers arranged in the boiler room, how to start and stop, increase or decrease the number of operating boilers in a timely manner, as well as settings such as the set temperature of boiler operation, are the keys to determining the operating efficiency of the boiler room heating system. Therefore, it is particularly important to develop an automated boiler group control management system and be able to implement a self - adaptive adjustment system for the set temperature of the boiler to manage multiple boilers in the boiler room, achieve economical operation, and improve the operating efficiency of the system. Summary of the Invention

[0003] In order to solve the technical problems existing in the prior art, the present invention discloses a control method for an adaptive boiler group, and the specific technical solutions are as follows:

[0004] The present invention provides a control method for an adaptive boiler group, including the following steps:

[0005] S1, when the heating system is in the standby state, after the control system receives the heating demand signal, the control system starts the water pump, resumes the heating cycle, and performs water replenishment and air exhaust;

[0006] S2, the control system collects the outdoor temperature and the system temperature in real - time, and then determines the value of the initial set temperature according to the preset heating curve of outdoor temperature - set temperature. The control system compares the system temperature with the set temperature. When the system temperature is less than the set temperature, the set temperature is used as the target temperature, and then the circulating water flow measured by the system flowmeter is added to calculate the heat required by the system and the size of the heating load of the system. Considering the actual situation of the boiler group, after determining the number and number of boilers to be started, the control system sends a boiler starting instruction to the boiler group;

[0007] S3, the designated boilers start to supply heat. The control system timely adjusts the target temperature of the water supply according to the comparison change between the real - time set temperature and the system temperature, thereby adjusting the boiler load to make the heating system and the heat load on the end - user side in a supply - demand balance state, achieving the purpose of constant - temperature heating;

[0008] S4. After the heating demand signal received by the control system is disconnected, the control system will shut down the boilers in sequence and perform a delayed shutdown process on the running water pumps. When the system water temperature is relatively high, the water pumps will continue to operate at a low frequency. Utilizing the thermal inertia of the stored water in the system, as much heat as possible from the stored water will be sent to the end user side. When the system water temperature drops to a certain range, the water pumps will be shut down.

[0009] Further, in step S2, the set temperature has an upper and lower deviation range. When the actual system temperature is less than the set temperature minus the lower deviation value, the control system starts the boiler. When the actual system temperature is greater than the set temperature plus the upper deviation value, the control system shuts down the boiler, and the heating system remains in the standby state. When the actual system temperature is within the upper and lower deviation range of the set temperature, the heating system maintains its original state.

[0010] Further, in step S2, when the temperature difference between the actual system temperature and the set temperature exceeds a pre-set difference value, the compensation value program will be triggered, and the actual target temperature will become the set temperature plus or minus the compensation value; when the temperature difference between the actual system temperature and the set temperature does not exceed the pre-set difference value, the compensation value program will not be triggered, and the set temperature will be used as the target temperature.

[0011] The compensation value of the set temperature is the temperature value obtained by multiplying the difference value between the upper and lower limits of the set compensation temperature by the compensation correction coefficient. Compensation correction coefficient = 1 - |(average(△temperature) / △time) / standard temperature change rate|. When the actual system temperature is greater than the set temperature, the actual target temperature is the set temperature minus the compensation value. When the actual system temperature is less than or equal to the set temperature, the actual target temperature is the set temperature plus the compensation value.

[0012] Further, in step S2, the actual situation of the boiler group includes the installed quantity of the boiler group, the installed power of each boiler, the running duration, the fault status, and the power size of each boiler.

[0013] Further, in step S3, when the boiler load is too high, the control system will perform corresponding PID calculations and start the optimal-level boiler to reduce the load of all running boilers to within the optimal heating load range; when the boiler load is too low, the control system shuts down the last-level boiler to raise the load of the running boilers to the optimal load range.

[0014] Further, in step S3, it also includes a rotation mechanism. The control system rotates the boilers within the boiler group by measuring the actual running time of each boiler, so that the running time of each boiler within the boiler group is quite equal.

[0015] Further, during the operation of the heating system, if there is a sudden substantial increase in the heating load, the control system will adjust the target temperature of the water supply in real time according to the changing trend of the actual system water temperature and the target water temperature, so as to rapidly increase the boiler load. While the boiler load is rapidly increasing, the optimal-level boiler will be quickly started. By increasing the target water temperature of the water supply and the number of operating boilers, the heating system can quickly meet the heating demand; when there is a sudden substantial decrease in the heating load in the heating system, the control system will adjust the target temperature of the water supply in real time according to the changing trend of the actual system water temperature and the target water temperature, so as to rapidly reduce the boiler load. While the boiler load is rapidly decreasing, the last-level boiler will be quickly shut down. By reducing the target water temperature of the water supply and the number of operating boilers, the heating system can quickly meet the heating demand.

[0016] Further, in the case of not receiving the heating demand signal, when the system temperature sensor temperature is lower than the set value for starting the water pump, the control system starts the water pump to prevent freezing through the flow of water in the pipeline.

[0017] Further, when the temperature sensor temperature of the heating system is lower than the set value of the anti-freezing protection water temperature, the control system sends a start signal to the optimal-level boiler to start one boiler and burn with the minimum fire output. Continue burning until the temperatures of all the water supply temperature sensors and the return water temperature sensors are higher than the anti-freezing safety set value, and then shut down the boiler.

[0018] The present invention has the following beneficial effects:

[0019] 1. The control method of the adaptive boiler group provided by the present invention can realize the group control of multiple boilers, ensure the average and stable operation of multiple boilers, and can reasonably allocate the operation of the system water pump to ensure the double balance of temperature and flow in the system.

[0020] 2. The control method of the adaptive boiler group provided by the present invention enables multiple boilers to start and stop timely according to the change of the system load during operation, so that the boiler load is always in the state of the best thermal efficiency.

[0021] 3. The control method of the adaptive boiler group provided by the present invention ensures the average operation time and the average service life of multiple boilers.

[0022] 4. The control method of the adaptive boiler group provided by the present invention has an adaptive function. In the initial stage of the system operation, the system supplies heat according to the preset temperature curve. During the heating process, according to the changing trend of the temperature, the gap from the target temperature, and combined with the changing trend of the outdoor temperature, the final target temperature is adjusted and corrected in a timely manner without the need for additional human factors to participate.

[0023] 5. The control method of the adaptive boiler group provided by the present invention can use the system water temperature / terminal room temperature as the basis for whether the heating reaches the standard, which will be more reliable than relying only on the boiler water supply temperature. Because the system water temperature or the terminal room temperature is an important reference basis for whether the heating system provides heating up to the standard.

[0024] 6. The control method of the adaptive boiler group provided by the present invention incorporates the outdoor temperature compensation function, and the outdoor temperature compensation function runs through the entire heating control process. The heating system can adjust the system operating temperature in a timely manner according to the changes in the outdoor climate, and combine it with the terminal room temperature at the back end of the system, making the heating control more reasonable.

[0025] 7. The control method of the adaptive boiler group provided by the present invention can achieve the energy-saving and stable operation of the heating system, and also greatly ensure the comfort of the heating system, ensuring that the heating system does not overheat or overcool. On the premise of ensuring the comfort of the heating system, the purpose of energy conservation, emission reduction, cost reduction and efficiency improvement is achieved.

[0026] 8. The control method of the adaptive boiler group provided by the present invention effectively combines boilers, heat exchange stations, and end users, making the control more accurate and effective.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 It is the working principle diagram of the control method of the adaptive boiler group provided by the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The following will describe in detail the embodiments of the present invention. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as a limitation of the present invention.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is 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. Therefore, it should not be construed as a limitation to the present invention. In the description of the present invention, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "couple", "fix", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The present invention provides a control method for an adaptive boiler group. Refer to Figure 1 , and it includes the following steps:

[0034] S1. When the heating system is in the standby state, after the control system receives the heating demand signal, the control system starts the water pump, resumes the heating cycle, and performs water replenishment and air exhaust.

[0035] S2. The control system collects the outdoor temperature and the system temperature in real time, and then determines the value of the initial set temperature according to the preset heating curve of the outdoor temperature - set temperature. The control system compares the system temperature with the set temperature. When the system temperature is lower than the set temperature, the set temperature is used as the target temperature, and then the circulating water flow rate measured by the system flowmeter is added to calculate the heat required by the system and the load size of the system heating. Combining the actual situation of the boiler group, after determining the number and serial number of the boilers that need to be started, the control system sends a boiler starting instruction to the boiler group.

[0036] S3. The boilers with the specified serial numbers are started to supply heat. The control system timely adjusts the target temperature of the water supply according to the comparison change between the real-time set temperature and the system temperature, so as to adjust the boiler load, make the heating system and the heat load on the end user side in a supply-demand balance state, and achieve the purpose of constant temperature heating.

[0037] S4. After the heating demand signal received by the control system is disconnected, the control system will shut down the boilers in sequence and perform a delayed shutdown process on the running water pumps. When the system water temperature is relatively high, the water pumps will continue to operate at a low frequency. By utilizing the thermal inertia of the stored water in the system, as much heat as possible from the stored water will be sent to the end-user side. When the system water temperature drops to a certain range, the water pumps will be shut down.

[0038] In step S2, the set temperature has an upper and lower deviation range. When the actual system temperature is less than the set temperature minus the lower deviation value, the control system starts the boiler. When the actual system temperature is greater than the set temperature plus the upper deviation value, the control system shuts down the boiler, and the heating system enters the standby state. When the actual system temperature is within the upper and lower deviation range of the set temperature, the heating system maintains its original state.

[0039] When the temperature difference between the actual system temperature and the set temperature exceeds the pre-set difference, the compensation value program will be triggered, and the actual target temperature will become the set temperature plus or minus the compensation value; when the temperature difference between the actual system temperature and the set temperature does not exceed the pre-set difference, the compensation value program will not be triggered, and the set temperature will be used as the target temperature.

[0040] The compensation value of the set temperature is the temperature value obtained by multiplying the fixed difference between the upper and lower limits of the set compensation temperature by the compensation correction coefficient. The compensation value correction coefficient = 1 - |(average(△temperature) / △time) / standard temperature change rate|. When the actual system temperature is greater than the set temperature, the actual target temperature is the set temperature minus the compensation value; when the actual system temperature is less than or equal to the set temperature, the actual target temperature is the set temperature plus the compensation value.

[0041] The actual situation of the boiler group includes the installed number of boilers in the boiler group, as well as the installed power, running duration, fault status, and power size of each boiler.

[0042] In one embodiment, when the boiler load is too high, the control system will perform corresponding PID calculations and start the optimal-level boiler to reduce the load of all running boilers to within the optimal heating load range; when the boiler load is too low, the control system shuts down the last-level boiler to increase the load of the running boilers to the optimal load range.

[0043] In one embodiment, step S3 also includes a rotation mechanism. The control system rotates the boilers in the boiler group by measuring the actual running time of each boiler, so that the running time of each boiler in the boiler group is relatively equal.

[0044] In one embodiment, during the operation of the heating system, if there is a sudden significant increase in the heating load, the control system will adjust the target temperature of the water supply in real time according to the change trend of the actual system water temperature and the target water temperature, so as to rapidly increase the boiler load. While the boiler load is rapidly increasing, the optimal-level boiler will be quickly started. By increasing the target water temperature of the water supply and the number of boilers in operation, the heating system can quickly meet the heating demand; when there is a sudden significant decrease in the heating load in the heating system, the control system will adjust the target temperature of the water supply in real time according to the change trend of the actual system water temperature and the target water temperature, so as to rapidly reduce the boiler load. While the boiler load is rapidly decreasing, the last-level boiler will be quickly shut down. By reducing the target water temperature of the water supply and the number of boilers in operation, the heating system can quickly meet the heating demand.

[0045] In the case of not receiving the heating demand signal, when the system temperature sensor temperature is lower than the set value for the water pump to start, the control system starts the water pump to prevent freezing through the flow of water in the pipeline.

[0046] When the temperature sensor temperature of the heating system is lower than the set value of the anti-freezing protection water temperature, the control system sends a start signal to the optimal-level boiler to start one boiler and burn with the minimum fire output. Continue burning until the temperatures of all water supply temperature sensors and return water temperature sensors are higher than the anti-freezing safety set value, then shut down the boiler.

[0047] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0048] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications and variations to the above embodiments within the scope of the present invention.

Claims

1. A control method for an adaptive boiler group, characterized in that, It includes the following steps: S1. When the heating system is in the standby state, after the control system receives the heating demand signal, the control system starts the water pump, resumes the heating cycle, and performs water replenishment and air exhaust; S2. The control system collects the outdoor temperature and the system temperature in real time, and then determines the value of the initial set temperature according to the preset heating curve of outdoor temperature - set temperature. The control system compares the system temperature with the set temperature. When the system temperature is lower than the set temperature, the set temperature is used as the target temperature, and then the circulating water flow measured by the system flowmeter is added to calculate the heat required by the system and the load of the system heating. Combining the actual situation of the boiler group, after judging the number and number of boilers that need to be started, the control system sends a boiler starting instruction to the boiler group; S3. The boilers with the specified numbers are started to supply heat. The control system adjusts the target temperature of the water supply in a timely manner according to the comparison change between the real-time set temperature and the system temperature, so as to adjust the boiler load, so that the heating system and the heat load on the end user side are in a supply-demand balance state, achieving the purpose of constant temperature heating; S4. When the heating demand signal received by the control system is disconnected, the control system shuts down the boilers in sequence and performs a delayed shutdown process on the running water pump. When the system water temperature is relatively high, the water pump will continue to run at a low frequency, and use the heat inertia of the water stored in the system to send the heat of the stored water to the end user side as much as possible. When the system water temperature drops to a certain range, the water pump is shut down.

2. The control method of the adaptive boiler group according to claim 1, characterized in that In step S2, The set temperature has an upper and lower deviation range. When the actual system temperature is lower than the set temperature minus the lower deviation value, the control system starts the boiler. When the actual system temperature is higher than the set temperature plus the upper deviation value, the control system starts to shut down the boiler, and the heating system remains in the standby state. When the actual system temperature is within the upper and lower deviation ranges of the set temperature, the heating system remains in its original state.

3. The control method of the adaptive boiler group according to claim 1, characterized in that In step S2, When the temperature difference between the actual system temperature and the set temperature exceeds the preset difference, the compensation value program will be triggered, and the actual target temperature will become the set temperature plus or minus the compensation value; when the temperature difference between the actual system temperature and the set temperature does not exceed the preset difference, the compensation value program will not be triggered, and the set temperature will be used as the target temperature. The compensation value of the set temperature is the temperature value obtained by multiplying the difference between the upper and lower limits of the preset compensation temperature by the compensation correction coefficient. The compensation value correction coefficient = 1 - |(average(△ temperature) / △ time) / standard temperature change rate|. When the actual system temperature is higher than the set temperature, the actual target temperature is the set temperature minus the compensation value. When the actual system temperature is less than or equal to the set temperature, the actual target temperature is the set temperature plus the compensation value.

4. The control method of the adaptive boiler group according to claim 1, characterized in that, In step S2, the actual situation of the boiler group includes the installed number of the boiler group, the installed power, running duration, fault status and power of each boiler.

5. The control method of the adaptive boiler group according to claim 1, characterized in that In step S3, when the boiler load is too high, the control system will perform corresponding PID calculations and start the optimal-level boiler to reduce the load of all running boilers to the optimal heating load range; when the boiler load is too low, the control system shuts down the last-level boiler and raises the load of the running boilers to the optimal load range.

6. The control method of the adaptive boiler group according to claim 1, wherein In step S3, a rotation mechanism is further included. The control system measures the actual operating time of each boiler and rotates the boilers in the boiler group for use, so that the operating time of each boiler in the boiler group is equivalent.

7. The control method of the adaptive boiler group according to claim 1, wherein During the operation of the heating system, if there is a sudden substantial increase in the heating load, the control system will adjust the target temperature of the water supply in real time according to the change trend of the actual system water temperature and the target water temperature, so that the boiler load can be rapidly increased. While the boiler load is rapidly increased, the optimal-level boiler is quickly started. By increasing the target water temperature of the water supply and the number of operating boilers, the heating system can quickly meet the heating demand. When there is a sudden substantial decrease in the heating load in the heating system, the control system will adjust the target temperature of the water supply in real time according to the change trend of the actual system water temperature and the target water temperature, so that the boiler load can be rapidly reduced. While the boiler load is rapidly reduced, the last-level boiler is quickly shut down. By reducing the target water temperature of the water supply and the number of operating boilers, the heating system can quickly meet the heating demand.

8. The control method of the adaptive boiler group according to claim 1, characterized in that In the case of not receiving the heating demand signal, when the system temperature sensor temperature is lower than the set value for starting the water pump, the control system starts the water pump to prevent freezing through the flow of water in the pipeline.

9. The control method of the adaptive boiler group according to claim 1, characterized in that When the temperature sensor temperature of the heating system is lower than the set value of the anti-freezing protection water temperature, the control system sends a start signal to the optimal-level boiler to start one boiler and burn with the minimum fire output. Continue burning until the temperatures of all the water supply temperature sensors and the return water temperature sensors are higher than the anti-freezing safety set value, and then shut down the boiler.

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