CN114183926B - Control method of boiler unit and boiler group control system - Google Patents
Control method of boiler unit and boiler group control system Download PDFInfo
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- CN114183926B CN114183926B CN202111492789.3A CN202111492789A CN114183926B CN 114183926 B CN114183926 B CN 114183926B CN 202111492789 A CN202111492789 A CN 202111492789A CN 114183926 B CN114183926 B CN 114183926B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
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Abstract
The invention discloses a control method of a boiler unit and a boiler group control system, comprising the following steps: acquiring a current operation mode of a boiler unit and an operation state parameter of the boiler unit; and determining whether the boiler unit is unloaded or not according to the comparison result of the comparison program of the current operation mode and the operation state parameters of the current boiler unit. The invention can match the running state of the current boiler unit, so that the system can load and unload on the premise of meeting the heat supply requirement of a user, and effectively avoids frequent load and unload of the boiler unit by setting interval accumulated time, so that the control of a boiler group control system is more reasonable.
Description
Technical Field
The invention relates to the field of boiler unit control, in particular to a boiler unit control method and a boiler group control system.
Background
In the boiler group control system, how to control the loading and unloading of the boiler unit relates to whether the system can stably operate in an energy-saving mode. The number of units is large, so that the whole system is not energy-saving; if the number of the units is small, the heat requirement of the system may not be met. Moreover, the load of the customer changes at any time, and if the control is not reasonable, the boiler is started and stopped frequently, which also causes energy waste. The patent aims at providing a control method for the loading and unloading number of the boiler units, so that the frequent loading and unloading of the boiler units are avoided on the premise that the system meets the heat supply requirements of users, the control of a boiler group control system is more reasonable, the efficiency is improved, the energy waste is avoided, and the energy-saving stable operation is realized.
Disclosure of Invention
The invention provides a control method of a boiler unit and a boiler group control system in order to solve the technical problem that the load increase and the load decrease of the boiler unit are unreasonable in the prior art.
The technical scheme adopted by the invention is as follows:
the invention provides a control method of a boiler unit, which comprises the following steps:
acquiring a current operation mode of a boiler unit and an operation state parameter of the boiler unit;
and determining whether the boiler unit is unloaded or not according to the comparison result of the comparison program of the current operation mode and the operation state parameters of the current boiler unit.
The current operation mode of the boiler unit comprises the following steps: the system comprises a loading mode and a load shedding mode, wherein the number of the running boiler units is increased when the loading mode is operated, and the number of the running boiler units is reduced when the load shedding mode is operated.
The operation state parameters of the boiler unit comprise: the number of the current boiler units, the average value of the water outlet temperature of the current boiler unit, the average load of the current boiler unit and the water outlet temperature of the water outlet main pipe.
Determining whether the boiler group is loaded according to the comparison result of the comparison program of the loading mode and the operation state parameters of the current boiler group comprises the following steps:
s11, judging whether the sum of the number of the operating units of the current boiler unit and the deviation value is less than or equal to the limit value of the number of the operating units of the boiler unit, if so, executing S12; if not, returning to the step of judging S11;
s12, judging whether the sum of the number of the operating units of the current boiler unit and the deviation value is less than or equal to the number of the water paths in the normal state or not, and if so, executing a front program for loading the boiler unit to load the boiler unit; if not, the process returns to the judgment step of S11.
Further, the step of executing the pre-program loading boiler unit for loading the boiler unit specifically comprises the following steps:
s131, judging whether the average value of the water outlet temperature of the currently running boiler unit is less than or equal to the difference value between the set value of the water outlet temperature of the water outlet main pipe and the set value of the temperature deviation of the added machine of the boiler unit, and whether the average load of the currently running boiler unit is greater than the set value of the added machine load; if yes, accumulating the accumulated time of the startup interval, and executing step S132, otherwise, returning to the judging step of S11 or executing step 133;
s132, judging whether the startup interval accumulated time is greater than or equal to a load startup interval time set value or not, if so, starting a preset number of boiler units after delaying preset time, and returning to the step S11; if not, the process returns to the judgment step of S11.
Preferably, the step of executing the pre-program loading boiler group for loading the boiler group further comprises the steps of:
s133, judging whether the outlet water temperature of the outlet main pipe or the average value of the outlet water temperatures of the currently running boiler units is greater than or equal to the sum of the outlet water temperature set value of the outlet main pipe and the temperature plus machine temperature deviation set value; if yes, accumulating the accumulated time of the startup interval, executing the step S134, and if not, returning to the judgment step of S11;
and S134, judging whether the startup interval accumulated time is greater than or equal to a temperature startup interval time set value, if so, starting a preset number of boiler units after delaying preset time, and returning to the step S11.
The comparison result of the comparison program of the load shedding mode and the operation state parameters of the current boiler unit to determine whether the boiler unit is unloaded comprises the following steps:
s21, judging whether the number of the operating units of the current boiler unit is larger than the limit value of the minimum number of the operating units of the boiler unit; if yes, executing S22, otherwise, returning to the judgment step of S21;
s22, judging whether the number of the running boiler units is larger than or equal to a preset number and the standby time exceeds a preset time; if yes, closing a preset number of boiler units after delaying the preset time, and returning to the step S21; if not, accumulating the accumulated time of the load shedding machine, and executing a preposed program load shedding boiler unit of the load shedding boiler unit.
Further, the pre-procedure load shedding boiler unit for executing the load shedding boiler unit comprises the steps of:
s221, judging whether the machine-reducing accumulated time of the machine set is greater than or equal to the load-reducing interval time of the machine set, if so, executing a step S222, otherwise, returning to the judging step of S21;
s222, judging whether the average load of the current boiler unit is less than or equal to a machine load reduction set value corresponding to the number of the current boiler units, if so, closing the boiler units with preset number after delaying preset time, and returning to the step S21; if not, the process returns to step S21.
Further, the adding interval accumulated time of the loading mode and the subtracting accumulated time of the unloading mode are cleared when a boiler unit is subjected to adding, subtracting or fault cutting.
The invention also provides a boiler group control system, which controls the loading and unloading of the boiler unit by using the control method.
Compared with the prior art, the method can be matched with the running state of the current boiler unit, so that the system can load and unload on the premise of meeting the heat supply requirement of a user, and the frequent load and unload of the boiler unit are effectively avoided by setting the interval accumulated time, so that the control of a boiler group control system is more reasonable.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a flow chart of the present invention for loading a boiler unit;
FIG. 3 is a flow chart of a pre-program for loading a boiler unit according to the present invention;
FIG. 4 is a flow chart of loading a boiler unit in an embodiment of the present invention;
FIG. 5 is a flow diagram of the load shedding boiler plant of the present invention;
FIG. 6 is a flow chart of a load shedding boiler unit in an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.
As shown in fig. 1, the present invention provides a control method for a boiler unit, comprising the steps of:
acquiring a current operation mode of a boiler unit and an operation state parameter of the boiler unit;
and determining the loading and unloading time of the boiler unit according to the comparison result of the comparison program of the current operation mode and the operation state parameters of the current boiler unit, namely determining the time point for adjusting the number of the boiler units. The running state of the current boiler unit can be matched, so that the system avoids frequent loading and unloading of the boiler unit on the premise of meeting the heat supply requirement of a user, and the control of a boiler group control system is more reasonable.
The operation mode specifically comprises the following steps: the system comprises a loading mode and a load shedding mode, wherein the number of running boiler units is increased when the loading mode is operated, and the number of running boiler units is reduced when the load shedding mode is operated.
The operation state parameters of the boiler unit specifically include: the number of the current boiler units, the average value of the water outlet temperature of the current boiler unit, the average load of the current boiler unit, and the water outlet temperature of a water outlet main pipe (hot water main pipe) can be detected by a boiler unit group control system.
As shown in fig. 2, wherein the step of determining whether the boiler unit is loaded according to the comparison result of the comparison program of the loading mode and the operation state parameter of the current boiler unit comprises the steps of:
s11, judging whether the sum of the number of the operating units of the current boiler unit and the deviation value is less than or equal to the limit value of the number of the operating units of the boiler unit, if so, executing S12; if not, returning to the step of judging S11;
s12, judging whether the sum of the number of the operating units of the current boiler unit and the deviation value is less than or equal to the number of the water paths in the normal state or not, and if so, executing a front program for loading the boiler unit to load the boiler unit; if not, returning to the step of judging S11;
as shown in fig. 4, the deviation value may be specifically 1, that is, whether the limit value of the number of operating boiler units is greater than or equal to the number of operating boiler units +1 of the current boiler unit is satisfied, the limit value of the number of operating boiler units may be set by a user through a monitoring software interface according to the actual situation of the project, and the parameter is used to limit several boiler units that can be operated at most. The number of the water paths in the normal state is the number of the water paths which can be put into use in a remote controllable state and have no faults, the water paths refer to equipment comprising a boiler and a water pump corresponding to the boiler, and therefore the number of the usable water paths is the number of the water paths which can be automatically started by confirming an available program.
As shown in fig. 3, the pre-program loading boiler group for executing the loading boiler group includes the steps of:
s131, judging whether the average value of the water outlet temperature of the currently running boiler unit is less than or equal to the difference value between the set value of the water outlet temperature of the water outlet main pipe and the set value of the adding temperature deviation of the boiler unit, and whether the average load of the currently running boiler unit is greater than the set value of the adding load; if yes, accumulating the accumulated time of the startup interval, and executing step S132, otherwise, returning to the judgment step of S11 or executing step S133;
s132, judging whether the startup interval accumulated time is greater than or equal to a load startup interval time set value, if so, starting a preset number of boiler units after delaying preset time, and returning to the step S11; if not, the process returns to the judgment step of S11. The loading operation can be carried out as long as the operation state of the boiler unit is not changed and the operation lasts for a certain time, so that frequent loading is avoided.
For optimal control, executing the pre-program load boiler group of the load boiler group further comprises the steps of:
s133, judging whether the outlet water temperature of the water outlet main pipe or the average value of the outlet water temperatures of the currently running boiler unit is greater than or equal to the sum of the outlet water temperature set value of the water outlet main pipe and the temperature plus machine temperature deviation set value; if yes, accumulating the accumulated time of the startup interval, executing the step S134, and if not, returning to the judgment step of S11;
s134, judging whether the startup interval accumulated time is greater than or equal to a temperature startup interval time set value, if so, starting a preset number of boiler units after delaying the preset time, and returning to the step S11; if not, the process returns to step S11.
The steps of S131 and S133 may be performed simultaneously, or any one of the steps of S131 and S133 is selected to be operated to determine whether the current state of the boiler unit satisfies the loading, or whether S131 satisfies the loading may be determined first, and if not, the step is skipped to S133 to perform the supplementary determination, so that the boiler unit is ensured to be able to perform the normal loading operation.
In a specific embodiment, the boiler group loading temperature deviation set point may be specifically set to 2.5, and the loading set point may be set to 95%. The load add interval time set point may be set to 12 minutes. The set value of the temperature plus machine temperature deviation can be set to be 7 ℃, the set value of the temperature plus machine interval time can be set to be 30 minutes, the specific values are only used for illustration for normal implementation, and the specific values can be adjusted and changed within corresponding ranges according to actual needs in specific use.
As shown in fig. 5, the comparing procedure of the load shedding mode with the comparison result of the operation state parameters of the current boiler group to determine whether the boiler group is load shed or not includes the steps of:
s21, judging whether the number of the operating units of the current boiler unit is larger than the limit value of the minimum number of the operating units of the boiler unit; if yes, executing S22, otherwise, returning to the judgment step of S21;
s22, judging whether the number of the running boiler units is larger than or equal to a preset number and the standby time exceeds a preset time; if yes, closing a preset number of boiler units after delaying preset time; if not, accumulating the accumulated time of the load shedding machine, and executing a preposed program load shedding boiler unit of the load shedding boiler unit.
The user of the minimum operation number limit value of the boiler unit can set the minimum operation number limit value of the boiler unit by the monitoring software interface according to the actual situation of a project, and the parameter is used for limiting a few boiler units to be operated. The preset number of the stations may be set to 2 in particular.
The method for executing the preposed program load shedding boiler unit of the load shedding boiler unit comprises the following specific steps:
s221, judging whether the machine-reducing accumulated time of the unit is greater than or equal to the load-reducing interval time of the unit, if so, executing a step S222, otherwise, returning to the judging step of S21;
s222, judging whether the average load of the current boiler unit is less than or equal to the reduced load set value corresponding to the number of the current boiler units, if so, closing the preset number of the boiler units after delaying for preset time, and returning to the step S21; if not, the process returns to step S21.
As shown in fig. 6, the load reduction set point is related to the number of operating boiler units, and the number of operating boiler units is different, and the value is also different. The following example is given for 4 units: when the number of the operating boiler units is 2, the average load of the current boiler units is less than 2 set load reducing set values (default: 56%); or when the number of the operating boiler units is 3, the average load of the started units is less than 3 set values of reducing the machine load (default: 70%); or when the number of the running boiler units is 4, the average load of the started units is less than 4 set values of the reduction of the unit load (default: 75%).
The preset number of boiler units is 1 boiler unit, namely, one boiler unit is opened or closed each time loading or unloading is carried out. And clearing the accumulated time of the subtracting machine and the accumulated time of the adding machine interval when the adding machine, the subtracting machine or the fault cutting machine occurs in the boiler unit. For example, when 2 machine sets run, the 1# machine set is in low-load standby, and the machine reduction accumulated time is not cleared; and subtracting 1 machine from 2 machine sets, clearing the accumulated time of subtracting machines, and timing again.
Starting a preset number of boiler units after delaying the preset time and closing the preset number of boiler units after delaying the preset time are realized by starting a delay timer, wherein the preset time can be specifically set to be 1-10 minutes, for example, 2 minutes, and when the countdown of the delay timer is 0, the starting and the reducing are performed.
The invention also provides a boiler group control system, and the loading and unloading of the boiler unit are controlled by using the control method. The boiler group control system comprises water paths and a control system, each water path is connected with a water outlet main pipe, each water path comprises a boiler unit and equipment such as a water pump corresponding to the boiler unit, and the specific equipment and layout of the group control system are the prior art, are not the key points of the invention protection and are not specifically described.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A method of controlling a boiler unit, comprising the steps of:
acquiring a current operation mode of a boiler unit and an operation state parameter of the current boiler unit, wherein the current operation mode comprises the following steps: a load mode and a load shedding mode;
determining whether the boiler unit is unloaded according to a comparison result of a comparison program of the current operation mode and the operation state parameters of the current boiler unit;
determining whether the boiler unit is loaded according to the comparison result of the comparison program of the loading mode and the operation state parameter of the current boiler unit comprises the following steps:
s11, judging whether the sum of the number of the operating units of the current boiler unit and the deviation value is less than or equal to the limit value of the number of the operating units of the boiler unit, if so, executing S12; if not, returning to the step of judging S11;
s12, judging whether the sum of the number of the operating units of the current boiler unit and the deviation value is less than or equal to the number of the water paths in the normal state or not, and if so, executing a front program for loading the boiler unit to load the boiler unit; if not, returning to the step of judging S11;
the method for executing the pre-program loading boiler unit of the loading boiler unit comprises the following steps:
s131, judging whether the average value of the water outlet temperature of the currently running boiler unit is less than or equal to the difference value between the set value of the water outlet temperature of the water outlet main pipe and the set value of the adding temperature deviation of the boiler unit, and whether the average load of the currently running boiler unit is greater than the set value of the adding load; if yes, accumulating the accumulated time of the startup interval, and executing step S132, otherwise, returning to the judgment step of S11 or executing step S133;
s132, judging whether the startup interval accumulated time is greater than or equal to a load startup interval time set value or not, if so, starting a preset number of boiler units after delaying preset time, and returning to the step S11;
s133, judging whether the outlet water temperature of the outlet main pipe or the average value of the outlet water temperatures of the currently running boiler units is greater than or equal to the sum of the outlet water temperature set value of the outlet main pipe and the temperature plus machine temperature deviation set value; if yes, accumulating the adding interval accumulation time, and executing the step S134; if not, returning to the step of judging S11;
and S134, judging whether the startup interval accumulated time is greater than or equal to a temperature startup interval time set value, if so, starting a preset number of boiler units after delaying preset time, and returning to the step S11.
2. The control method for the boiler group according to claim 1, wherein the number of operating boiler groups is increased when the load mode is operated, and the number of operating boiler groups is decreased when the unload mode is operated.
3. A control method of a boiler plant according to claim 2, characterized in that the operating state parameters of the boiler plant comprise: the number of the current boiler units, the average value of the water outlet temperature of the current boiler units, the average load of the current boiler units and the water outlet temperature of a water outlet main pipe.
4. A control method of a boiler plant according to claim 3, characterized in that determining whether a boiler plant is de-rated based on the comparison of the comparison program of the de-rating pattern and the operational status parameters of the current boiler plant comprises the steps of:
s21, judging whether the number of the operating units of the current boiler unit is larger than the limit value of the minimum number of the operating units of the boiler unit; if yes, executing S22, otherwise, returning to the step of judging S21;
s22, judging whether the number of the running boiler units is larger than or equal to a preset number and the standby time exceeds a preset time; if yes, closing the boiler units with the preset number after delaying the preset time, and then returning to the step S21; if not, accumulating the accumulated time of the load shedding machine, and executing a preposed program load shedding boiler unit of the load shedding boiler unit.
5. A control method of a boiler plant according to claim 4, characterized in that said performing a pre-program de-rating of a boiler plant comprises the steps of:
s221, judging whether the machine-reducing accumulated time of the machine set is greater than or equal to the machine set load-reducing interval time, if so, executing a step S222, otherwise, returning to the judging step of S21;
s222, judging whether the average load of the current boiler unit is less than or equal to a machine load reduction set value corresponding to the number of the current boiler units, if so, closing the boiler units with preset number after delaying preset time, and returning to the step S21; if not, the process returns to step S21.
6. The control method for the boiler unit according to claim 4, wherein the cumulative time of the loading mode for the loading interval and the cumulative time of the unloading mode for the unloading interval are cleared when the boiler unit is in the loading, unloading or fault cutting.
7. A group control system for boilers, characterized in that the control method of any one of claims 1 to 6 is used to control the time of load shedding of a group of boilers.
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2021
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| KR100577524B1 (en) * | 2004-12-24 | 2006-05-10 | 린나이코리아 주식회사 | Air-mixing control devick of boiler |
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