CN109268808B - Group control method and device for boiler - Google Patents
Group control method and device for boiler Download PDFInfo
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- CN109268808B CN109268808B CN201811094766.5A CN201811094766A CN109268808B CN 109268808 B CN109268808 B CN 109268808B CN 201811094766 A CN201811094766 A CN 201811094766A CN 109268808 B CN109268808 B CN 109268808B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
- F22B35/18—Applications of computers to steam boiler control
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Abstract
The embodiment of the invention discloses a group control method and a device of a boiler, wherein the method comprises the following steps: detecting a real-time steam pressure value P of the boiler; calculating a target pressure value P of the boiler according to the real-time steam pressure P and a preset relational expressiono(ii) a Controlling the steam pressure of the boiler at the calculated valueThe target pressure value P of the boileroWithin a preset range of (a); wherein the target pressure value P of the boileroWith a predetermined start-up pressure PtIs less than or equal to a preset difference threshold value, so that the boiler works in a preset load rate range. By the scheme of the embodiment, the load control logic of the boilers is not changed, and the automatic high-efficiency operation group control of a plurality of boilers can be realized; therefore, the dependence of boiler load regulation and start-stop control on human experience is greatly reduced, and the standard operation level of the steam boiler is improved.
Description
Technical Field
The embodiment of the invention relates to a steam boiler regulation and control technology, in particular to a group control method and a group control device for boilers.
Background
The traditional single-pressure natural gas steam boiler is regulated and controlled by setting static starting pressure, stopping pressure and target pressure, wherein the stopping pressure is higher than the target pressure, and when the steam pressure reaches the stopping pressure, the boiler is automatically shut down; the starting pressure is lower than the target pressure, and when the steam pressure starts the pressure, the boiler is automatically started. Thus, as steam pressure varies between start-up and shut-down pressures, the load rate of the boiler also varies from the lowest load to the highest load. It follows that for a single boiler, the load adjustment process itself is automated and requires only manual setting of the start-up pressure, the shut-down pressure and the target pressure.
The efficiency of a natural gas steam boiler generally increases with increasing load, with the efficiency varying substantially linearly between 40% and 100% load and relatively gradually. It should therefore be avoided as much as possible that the boiler operates below 40% load, when the efficiency of the boiler tends to decline very rapidly.
However, when a plurality of boilers are operated simultaneously, if the same start pressure, stop pressure and target pressure are set for each boiler, the load response of all the boilers tends to be uniform, that is, the loads of all the boilers decrease when the load decreases, and the loads of all the boilers increase when the load increases. There are then situations where all boilers are in the low efficiency zone. The traditional adjusting method is usually to perform load and unload operations of the boiler by means of manual intervention according to the experience of operators, so that the dependence on the operation experience of the operators is strong.
Disclosure of Invention
The embodiment of the invention provides a group control method and a group control device for boilers, which can not only change the load control logic of the boilers, but also realize the automatic high-efficiency operation group control of a plurality of boilers; therefore, the dependence of boiler load regulation and start-stop control on human experience is greatly reduced, and the standard operation level of the steam boiler is improved.
To achieve the object of the embodiments of the present invention, the embodiments of the present invention provide a group control method for a boiler, which may include:
detecting a real-time steam pressure value P of the boiler;
calculating a target pressure value P of the boiler according to the real-time steam pressure P and a preset relational expressiono；
Controlling the steam pressure of the boiler at the calculated target pressure value P of the boileroWithin a preset range of (a);
wherein the target pressure value P of the boileroWith a predetermined start-up pressure PtIs less than or equal to a preset difference threshold value, so that the boiler works in a preset load rate range.
Optionally, the preset relation may include:
Po＝P+ΔPt-k·(ΔPt+ΔPq)
wherein, Δ PtFor a predetermined furnace-start pressure difference, Δ PqIs a preset furnace shutdown pressure difference, k is a control coefficient, and k is 0.2 (P-P)t)/(Pq-Pt)，PqIs the preset furnace shutdown pressure.
Optionally, the method may further include:
when the real-time steam pressure value P is smaller than or equal to the starting pressure, controlling the boiler to start;
and when the real-time steam pressure value P is greater than or equal to the blowing-out pressure, controlling the boiler to stop.
Optionally, the method may further include: at least one boiler is reserved as a fluctuation-responsive boiler, and the reserved boiler is kept floating between a preset minimum load rate and a preset rated load rate to respond to real-time fluctuation of the load.
Optionally, the method may further include:
when the real-time steam pressure value P of the boiler reaches a first preset pressure threshold value, controlling at least one boiler in the operating state to automatically stop;
wherein the first preset pressure threshold is greater than the blowing-out pressure Pq。
Optionally, the method may further include:
when the real-time steam pressure value P of the boiler reaches a second preset pressure threshold value and the number of the boilers in the running state does not reach the total number of the boilers, starting the boilers which are not in the running state;
wherein the second preset pressure threshold is smaller than the furnace starting pressure Pt。
Optionally, the method may further include:
and when the real-time steam pressure value P of the boiler reaches the second preset pressure threshold value and the number of the boilers in the running state reaches the total number of the boilers, alarming and exiting the current automatic control mode.
Optionally, the method may further include:
when the real-time steam pressure value P of the boiler reaches a third preset pressure threshold value or the real-time steam pressure value P reaches a fourth preset pressure threshold value, alarming and exiting the automatic control mode;
wherein the third preset pressure threshold is greater than the first preset pressure threshold; the fourth preset pressure threshold is smaller than the second preset pressure threshold.
Optionally, the furnace start pressure PtThe method comprises the following steps: 0.7MPa to 0.8 MPa;
the blowing-out pressure PqThe method comprises the following steps: 0.9MPa to 1.0 MPa;
the furnace starting pressure difference delta PtAnd said blow-out pressure differential Δ PqBoth comprise: 0.02MPa to 0.03 MPa;
the first preset pressure threshold comprises: 1.03MPa to 1.05 MPa;
the second preset pressure threshold comprises: 0.65MPa to 0.75 MPa;
the third preset pressure threshold comprises: 1.1MPa to 1.15 MPa;
the fourth preset pressure threshold comprises: 0.6MPa to 0.65 MPa.
The embodiment of the invention also provides a group control device of a boiler, which comprises a processor and a computer readable storage medium, wherein the computer readable storage medium stores instructions, and the group control device of the boiler is characterized in that when the instructions are executed by the processor, the group control method of the boiler is realized.
The embodiment of the invention comprises the following steps: detecting a real-time steam pressure value P of the boiler; calculating a target pressure value P of the boiler according to the real-time steam pressure P and a preset relational expressiono(ii) a Controlling the steam pressure of the boiler at the calculated target pressure value P of the boileroWithin a preset range of (a); wherein the target pressure value P of the boileroWith a predetermined start-up pressure PtIs less than or equal to a preset difference threshold value, so that the boiler works in a preset load rate range. By the scheme of the embodiment, the load control logic of the boilers is not changed, and the automatic high-efficiency operation group control of a plurality of boilers can be realized; thereby greatly reducing the dependence of boiler load regulation and start-stop control on human experience and improvingThe standardized operating level of the steam boiler is achieved.
Additional features and advantages of embodiments of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the examples of the application do not constitute a limitation of the invention.
FIG. 1 is a flow chart of a group control method for a boiler according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a group control method for a boiler according to an embodiment of the present invention;
FIG. 3 is a block diagram of a group control apparatus for a boiler according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
Example one
A group control method of a boiler, as shown in FIG. 1 and FIG. 2, may include S101-S103:
s101, detecting a real-time steam pressure value P of a boiler;
s102, calculating a target pressure value P of the boiler according to the real-time steam pressure P and a preset relational expressiono；
S103, controlling the steam pressure of the boiler to be the calculated target pressure value P of the boileroWithin a preset range of (a);
wherein the target pressure value P of the boileroWith a predetermined start-up pressure PtIs less than or equal to a preset difference threshold value, so that the boiler works in a preset load rate range.
The embodiment of the invention provides an efficient group control method for a natural gas single-pressure steam boiler, which can be used for solving the problem that a plurality of natural gas boilers are easy to collectively fall into a low-efficiency area due to load fluctuation when the natural gas boilers operate simultaneously, and the group control loading and unloading process of the boilers is realized by changing the conventional manual intervention into automatic logic judgment.
In the embodiment of the invention, the load of the boiler can be automatically adjusted between the start pressure and the shutdown pressure by adopting PID (proportion integration differentiation), and the steam pressure is closer to the start pressure PtWhen the boiler load is larger, the steam pressure is closer to the blowing-out pressure PqThe smaller the boiler load. Thus, the target pressure of the steam (i.e., the target pressure value P of the boiler) can be adjusted by the preset relational expressiono) And the load factor of the boiler is controlled to be in a high-efficiency area between 80% and 100% by making the load factor of the boiler closer to the starting pressure.
In this embodiment of the present invention, the preset relation may include:
Po＝P+ΔPt-k·(ΔPt+ΔPq)
wherein, Δ PtFor a predetermined furnace-start pressure difference, Δ PqIs a preset furnace shutdown pressure difference, k is a control coefficient, and k is 0.2 (P-P)t)/(Pq-Pt)，PqIs the preset furnace shutdown pressure.
In the embodiment of the invention, the target pressure value P of the boileroAnd the furnace starting pressure PtThe pressure difference between the two is called the start-up pressure difference delta PtTarget pressure value P of boileroAnd the blow-out pressure PqThe pressure difference between them is called as the blowing-out pressure difference delta Pq。
In the embodiment of the invention, the k value is mainly used for controlling the load rate of the boiler to fluctuate slightly between 80% and 100% so as to prevent most of the running units from being at 80% load when the new units are required to be added.
Optionally, the furnace start pressure PtThe method can comprise the following steps: 0.7MPa to 0.8 MPa;
the blowing-out pressure PqThe method can comprise the following steps: 0.9MPa to 1.0 MPa;
the furnace starting pressure difference delta PtAnd said blow-out pressure differential Δ PqMay each include: 0.02MPa-0.03 MPa.
Optionally, the method may further include:
when the real-time steam pressure value P is smaller than or equal to the starting pressure, controlling the boiler to start;
and when the real-time steam pressure value P is greater than or equal to the blowing-out pressure, controlling the boiler to stop.
In the embodiment of the invention, when the real-time steam pressure value P is higher than the blowing-out pressure, the boiler can be automatically blown out; when the real-time pressure value P of the steam is lower than the starting pressure, the boiler can be automatically started. Thus, the pressure set point of the boiler (such as the target pressure value P of the boiler) can be modifiedoStart pressure difference, stop pressure difference and the like) to adjust the load of the boiler and start and stop the boiler, the scheme of the embodiment does not damage the automatic control logic of the boiler.
Optionally, the method may further include: at least one boiler is reserved as a fluctuation-responsive boiler, and the reserved boiler is kept floating between a preset minimum load rate and a preset rated load rate to respond to real-time fluctuation of the load.
In the embodiment of the invention, assuming that the number of currently-operated boilers is n +1, the control target of the scheme of the embodiment can ensure that n boilers are in a 80% -100% load rate interval, the rest 1 boilers float between the minimum load rate and the rated load rate to respond to real-time fluctuation of load, and n is a positive integer greater than 1.
In the embodiment of the invention, assuming that n +1 natural gas boilers are provided in total, the number of the actually operated natural gas boilers is m, and the steam pressure required by a steam user is assumed to be in a range of 0.8MPa to 1.0 MPa.
In the embodiment of the invention, the furnace pressure difference can be tentatively started to be 0.03MPa, m boilers are operated in total, m is a positive integer greater than or equal to 1, and m is smaller than n.
In the embodiment of the present invention, a Flag variable may be declared for each boiler, the Flag of 1 load fluctuation response boiler may be set to 0, and the Flag values of the remaining n boilers are 1, 2, and 3 … n in this order.
In the embodiment of the present invention, the start pressure of the boiler with Flag equal to 0 may be set to 0.8MPa, and the stop pressure may be set to 1.0 MPa. Setting the operating Flag to be 1, 2, 3 … m of the target pressure value P of the boileroThe setting is performed according to the following formula: po＝P+ΔPt-k·(ΔPt+ΔPq) Thereby realizing the high-efficiency control of each boiler.
Optionally, the method may further include:
when the real-time steam pressure value P of the boiler reaches a first preset pressure threshold value, controlling at least one boiler in the operating state to automatically stop;
wherein the first preset pressure threshold is greater than the blowing-out pressure Pq。
In this embodiment of the present invention, based on the above-mentioned embodiments, the first preset pressure threshold may include: 1.03MPa to 1.05MPa, for example, 1.05MPa can be selected.
In the embodiment of the present invention, when the real-time steam pressure P reaches 1.05MPa, at least one of the boilers in the operating state may be controlled to be automatically stopped, for example, the boiler of Flag ═ m is locked, and the target pressure P thereof is setoThe pressure is set to 0.76MPa, and the boiler is immediately and automatically shut down, namely, the load is automatically reduced.
Optionally, the method may further include:
when the real-time steam pressure value P of the boiler reaches a second preset pressure threshold value and the number of the boilers in the running state does not reach the total number of the boilers, starting the boilers which are not in the running state;
wherein the second preset pressure threshold is smaller than the furnace starting pressure Pt。
In this embodiment of the present invention, based on the above-mentioned embodiment, the second preset pressure threshold may include: 0.65MPa to 0.75MPa, for example, 0.75MPa can be selected.
In the embodiment of the invention, when the real-time steam pressure P reaches 0.75MPa, the boiler which is not in the running state can be started, for example, in the case that m < n, at least the (m + 1) th boiler can be added, and the target boiler pressure value P can be setoAnd setting according to the relation, and immediately starting the boiler to realize automatic loading.
Optionally, the method may further include:
and when the real-time steam pressure value P of the boiler reaches the second preset pressure threshold value and the number of the boilers in the running state reaches the total number of the boilers, alarming and exiting the current automatic control mode.
In an embodiment of the present invention, if m ═ n, an alarm may be generated, prompting that the maximum number of boilers has been put in, and exiting the current automatic operation mode.
Optionally, the method may further include:
when the real-time steam pressure value P of the boiler reaches a third preset pressure threshold value or the real-time steam pressure value P reaches a fourth preset pressure threshold value, alarming and exiting the automatic control mode;
wherein the third preset pressure threshold is greater than the first preset pressure threshold; the fourth preset pressure threshold is smaller than the second preset pressure threshold.
In this embodiment of the present invention, based on the above-mentioned embodiments, the third preset pressure threshold may include: 1.1MPa to 1.15 MPa; the fourth preset pressure threshold may include: 0.6MPa to 0.65 MPa. For example, the third preset pressure threshold may be selected to be 1.1MPa, and the fourth preset pressure threshold may be selected to be 0.7 MPa.
In the embodiment of the invention, when the real-time pressure value P of the steam reaches 1.1MPa, an alarm can be generated, and the automatic mode is exited; when the real-time pressure value P of the steam reaches 1.1MPa, an alarm can be generated, and the automatic mode is exited. High-pressure protection can be realized through the third preset pressure threshold, and low-pressure protection can be realized through the fourth preset pressure threshold.
The embodiment of the present invention further provides a group control apparatus 1 of a boiler, as shown in fig. 3, including a processor 11 and a computer-readable storage medium 12, where the computer-readable storage medium 12 stores instructions, and when the instructions are executed by the processor 11, the group control method of the boiler described above may be implemented.
The embodiment of the invention comprises the following steps: detecting a real-time steam pressure value P of the boiler; calculating a target pressure value P of the boiler according to the real-time steam pressure P and a preset relational expressiono(ii) a Controlling the steam pressure of the boiler at the calculated target pressure value P of the boileroWithin a preset range of (a); wherein the target pressure value P of the boileroWith a predetermined start-up pressure PtIs less than or equal to a preset difference threshold value, so that the boiler works in a preset load rate range. By the scheme of the embodiment, the load control logic of the boilers is not changed, and the automatic high-efficiency operation group control of a plurality of boilers can be realized; therefore, the dependence of boiler load regulation and start-stop control on human experience is greatly reduced, and the standard operation level of the steam boiler is improved.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
Claims (9)
1. A method for group control of boilers, characterized in that the method comprises:
detecting a real-time steam pressure value P of the boiler;
calculating a target pressure value P of the boiler according to the real-time steam pressure P and a preset relational expressiono；
Controlling the steam pressure of the boiler at the calculated target pressure value P of the boileroWithin a preset range of (a);
wherein the target pressure value P of the boileroWith a predetermined start-up pressure PtThe difference value of (a) is less than or equal to a preset difference value threshold value, so that the boiler works in a preset load rate range;
the preset relation includes:
Po＝P+ΔPt-k·(ΔPt+ΔPq)
wherein, Δ PtFor a predetermined furnace-start pressure difference, Δ PqIs a preset furnace shutdown pressure difference, k is a control coefficient, and k is 0.2 (P-P)t)/(Pq-Pt)，PqIs the preset furnace shutdown pressure.
2. The group control method of boilers according to claim 1, characterized in that the method further comprises:
when the real-time steam pressure value P is smaller than or equal to the starting pressure, controlling the boiler to start;
and when the real-time steam pressure value P is greater than or equal to the blowing-out pressure, controlling the boiler to stop.
3. A method for group control of boilers according to claim 1 or 2, characterized in that the method further comprises: at least one boiler is reserved as a fluctuation-responsive boiler, and the reserved boiler is kept floating between a preset minimum load rate and a preset rated load rate to respond to real-time fluctuation of the load.
4. A method for group control of boilers according to claim 1 or 2, characterized in that the method further comprises:
when the real-time steam pressure value P of the boiler reaches a first preset pressure threshold value, controlling at least one boiler in the operating state to automatically stop;
wherein the first preset pressure threshold is greater than the blowing-out pressure.
5. The group control method of boilers according to claim 4, characterized in that the method further comprises:
when the real-time steam pressure value P of the boiler reaches a second preset pressure threshold value and the number of the boilers in the running state does not reach the total number of the boilers, starting the boilers which are not in the running state;
wherein the second preset pressure threshold is smaller than the furnace starting pressure Pt。
6. The group control method of boilers according to claim 5, characterized in that the method further comprises:
and when the real-time steam pressure value P of the boiler reaches the second preset pressure threshold value and the number of the boilers in the running state reaches the total number of the boilers, alarming and exiting the current automatic control mode.
7. The group control method of boilers according to claim 6, characterized in that the method further comprises:
when the real-time steam pressure value P of the boiler reaches a third preset pressure threshold value or the real-time steam pressure value P reaches a fourth preset pressure threshold value, alarming and exiting the automatic control mode;
wherein the third preset pressure threshold is greater than the first preset pressure threshold; the fourth preset pressure threshold is smaller than the second preset pressure threshold.
8. Group control method of boilers according to claim 7,
the furnace starting pressure PtThe method comprises the following steps: 0.7MPa to 0.8 MPa;
the blowing-out pressure PqThe method comprises the following steps: 0.9MPa to 1.0 MPa;
the furnace starting pressure difference delta PtAnd said blow-out pressure differential Δ PqBoth comprise: 0.02MPa to 0.03 MPa;
the first preset pressure threshold comprises: 1.03MPa to 1.05 MPa;
the second preset pressure threshold comprises: 0.65MPa to 0.75 MPa;
the third preset pressure threshold comprises: 1.1MPa to 1.15 MPa;
the fourth preset pressure threshold comprises: 0.6MPa to 0.65 MPa.
9. A group control apparatus of a boiler, comprising a processor and a computer readable storage medium having instructions stored therein, characterized in that the instructions, when executed by the processor, implement a group control method of a boiler according to any one of claims 1-8.
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| JP5447083B2 (en) * | 2010-03-29 | 2014-03-19 | 三浦工業株式会社 | Program, controller and boiler system |
| CN102799778B (en) * | 2012-07-16 | 2016-06-22 | 杭州电子科技大学 | A kind of optimization boiler load distribution method |
| JP6102475B2 (en) * | 2013-05-01 | 2017-03-29 | 三浦工業株式会社 | Boiler system |
| CN104949092A (en) * | 2014-03-24 | 2015-09-30 | 东莞理文造纸厂有限公司 | Multi-boiler system capable of automatic control and control method thereof |
| CN104819507B (en) * | 2015-05-19 | 2017-07-04 | 周明 | A kind of Boiler Group control method |
| JP2018105519A (en) * | 2016-12-22 | 2018-07-05 | 三浦工業株式会社 | Boiler system |
| CN207298897U (en) * | 2017-09-27 | 2018-05-01 | 三浦工业株式会社 | Number control device and the boiler plant for possessing the number control device |
| CN108105140B (en) * | 2017-12-27 | 2019-10-15 | 湖南军信环保股份有限公司 | A kind of multi-stag pressure stabilizing control method and control system |
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