CN108916908B - Multivariable combustion control system - Google Patents
Multivariable combustion control system Download PDFInfo
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- CN108916908B CN108916908B CN201810883914.5A CN201810883914A CN108916908B CN 108916908 B CN108916908 B CN 108916908B CN 201810883914 A CN201810883914 A CN 201810883914A CN 108916908 B CN108916908 B CN 108916908B
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- combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
- Incineration Of Waste (AREA)
Abstract
The invention provides a multivariable combustion control system, which comprises a controllable combustion gas passage, a controllable air passage and a combustion chamber, wherein the controllable combustion gas passage and the controllable air passage are communicated with the combustion chamber; the combustion chamber comprises a gas mixing cavity and a plurality of combustion cavities; the controllable combustion gas passage, the controllable air passage and each combustion cavity are controlled by an intelligent control device; all be provided with pressure sensor, temperature sensor and humidity transducer in each combustion chamber, pressure sensor, temperature sensor and humidity transducer all with intelligent control device communication. The invention operates based on a full-automatic control mode, and single variable control in the prior art is abandoned in the control process, and complex variable control is carried out.
Description
Technical Field
The invention relates to the field of environmental protection, in particular to a multivariable combustion control system.
Background
The boiler is an energy converter, which is a device for heating working medium water or other fluids to certain parameters by using heat energy released by fuel combustion or other heat energy. The combustion reaction performed in the boiler is a condition in which the boiler supplies heat to the outside, and the degree of progress of the combustion reaction is directly related to the degree of heat generation of the boiler and the composition of gas in the exhaust gas. Therefore, there is a need for effective automated control of combustion reactions.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a multivariable combustion control system.
The invention is realized by the following technical scheme:
a multivariable combustion control system comprising a controllable combustion gas passage, a controllable air passage, and a combustion chamber, both of which are in communication with the combustion chamber; the combustion chamber comprises a gas mixing cavity and a plurality of combustion cavities;
the controllable combustion gas passage, the controllable air passage and each combustion cavity are controlled by an intelligent control device;
all be provided with pressure sensor, temperature sensor and humidity transducer in each combustion chamber, pressure sensor, temperature sensor and humidity transducer all with intelligent control device communication.
Furthermore, in the controllable combustion gas passage, combustion gas enters the gas mixing cavity through a first regulating valve, in the controllable air passage, air enters the gas mixing cavity through a second regulating valve, a first flowmeter is arranged at the first regulating valve, a second flowmeter is arranged at the second regulating valve, and the first flowmeter and the second flowmeter are both connected with the intelligent control device;
an oxygen detector is further arranged in the exhaust device and is in communication connection with the control device, so that the control device can obtain the current oxygen content in the exhaust gas.
Further, the intelligent control device comprises the following components:
the memory is used for storing a standard combustion chamber pressure corresponding model and a standard exhaust air content corresponding table;
the data preprocessing component is used for preprocessing data collected by the first flowmeter, the second flowmeter, the pressure sensor, the temperature sensor, the humidity sensor and the oxygen detector;
the first comparator is used for calculating the difference value between the target oxygen content and the current oxygen content in the exhaust gas to obtain a first variable;
the second comparator is used for calculating the difference value between the average pressure of the current combustion chamber and the target pressure to obtain a second variable;
the state acquirer is used for acquiring the second flowmeter count and calculating the current opening degree of the second regulating valve according to the second flowmeter count;
the regulator is used for obtaining the target starting degree of the second regulating valve and controlling the thyristor starter to finally enable the second regulating valve to reach the target starting degree;
and the trigger is used for generating an adjusting instruction for controlling the second regulating valve.
Furthermore, the standard combustion chamber pressure corresponding model takes the number of combustion chamber openings, the count of the first flowmeter, the combustion chamber combustion mode, the current combustion chamber humidity and the current combustion chamber temperature as independent variables, and takes the target pressure in the combustion chamber as a dependent variable; the air content corresponding table in the standard exhaust gas takes the opening number of the combustion chambers, the counting number of the first flow meter and the combustion mode of the combustion chambers as independent variables, and takes the target oxygen content in the exhaust gas as a dependent variable.
Further, the adjustment instruction generation condition is: a triggering event of reaching the adjustment command, or the average pressure of the current combustion chamber exceeding a predetermined pressure threshold, or the average temperature of the current combustion chamber exceeding a predetermined temperature threshold, or the oxygen content in the current exhaust gas being higher than a predetermined threshold.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
The invention has the beneficial effects that:
the multi-variable combustion control system can run based on a full-automatic control mode, single-variable control in the prior art is abandoned in the control process, and complex multi-variable control is carried out. In a specific control process, the pressure, the temperature, the humidity, the combustion gas flow, the air flow and the tail gas composition of each combustion cavity are comprehensively considered, a control scheme with strong comprehensiveness is formed, the combustion reaction in the combustion cavities can be accurately controlled based on a combustion mode, and a good control effect is achieved.
Drawings
FIG. 1 is a schematic diagram of a multivariable combustion control system provided in the present embodiment;
fig. 2 is a block diagram of the intelligent control device provided in the present embodiment;
FIG. 3 is a block diagram of a data preprocessing component provided by the present embodiment;
FIG. 4 is a logic flow diagram of an embodiment of a method for executing an adjust instruction;
fig. 5 is a corresponding relationship of the first variable and the contribution value of the target flow rate at the second flow meter provided by the present embodiment;
fig. 6 is a corresponding relationship of the second variable and the contribution value of the target flow rate at the second flow meter provided in the present embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below.
The embodiment of the invention provides a multivariable combustion control system, as shown in fig. 1, which comprises a controllable combustion gas passage 1, a controllable air passage 2 and a combustion chamber 3, wherein the controllable combustion gas passage 1 and the controllable air passage 2 are both communicated with the combustion chamber 3. The combustion chamber 3 comprises a gas mixing cavity 31 and a plurality of combustion cavities 32, and the gas mixing cavity 31 and each combustion cavity 32 are connected in series; each combustion chamber 32 is in a parallel relationship; the exterior of the combustion chamber is provided with a heat exchange device 4 for recovering the heat energy generated by combustion.
The combustion chamber 3 is also in communication with an exhaust 5, the exhaust 5 comprising an electric motor 51 and a control damper 52. Specifically, the controllable combustion gas path 1, the controllable air path 2, each combustion chamber 32, which can be independently opened or closed, and the control damper 52 are controlled by an intelligent control device 100. For N combustion chambers which are opened currently, the combustion gas and the air are evenly divided into N parts and respectively enter the opened combustion chambers, so that the control device automatically controls the air inflow of the controllable air passage according to the number of the combustion chambers which are opened currently.
In a possible embodiment, the intake air amount of the combustion gas of the controllable combustion gas passage 1 is also controllable, and the intake air amount of the combustion gas may also be used as one of the arguments of the air intake amount of the controllable air passage controlled by the control means.
In the controllable combustion gas passage 1, combustion gas enters the air mixing cavity 31 through the first regulating valve 11, in the controllable air passage 2, air enters the air mixing cavity 31 through the second regulating valve 21, the second regulating valve 21 is connected with an asynchronous motor, the asynchronous motor is controlled by a thyristor starter, and the thyristor starter is controlled by the intelligent control device 100. A first flow meter is arranged at the first regulating valve 11, a second flow meter is arranged at the second regulating valve 12, and both the first flow meter and the second flow meter are connected with the intelligent control device 100.
Specifically, each combustion chamber 32 is provided with a pressure sensor, a temperature sensor and a humidity sensor, and the pressure sensor, the temperature sensor and the humidity sensor are all communicated with the intelligent control device.
Specifically, the geometric center of the upper part of the exhaust device is provided with a convection heat exchanger which is provided with a horizontal pipeline communicated with a heat carrier so as to further recover heat energy from the exhausted flue gas.
An oxygen detector is further arranged in the exhaust device and is in communication connection with the control device, so that the control device can obtain the current oxygen content in the exhaust gas.
The intelligent control device 100 comprises the following components, as shown in fig. 2:
and the memory 101 is used for storing a standard combustion chamber pressure corresponding model and a standard exhaust air content corresponding table.
Specifically, the standard combustion chamber pressure corresponding model takes the number of combustion chamber openings, the count of the first flow meter, the combustion chamber combustion mode, the current combustion chamber humidity and the current combustion chamber temperature as independent variables, and takes the target pressure in the combustion chamber as a dependent variable. The standard combustion chamber pressure correspondence model may be obtained in a number of experimental ways.
The air content corresponding table in the standard exhaust gas takes the opening number of the combustion chambers, the counting number of the first flow meter and the combustion mode of the combustion chambers as independent variables, and takes the target oxygen content in the exhaust gas as a dependent variable.
The data preprocessing component 102 is configured to preprocess data collected by the first flowmeter, the second flowmeter, the pressure sensor, the temperature sensor, the humidity sensor, and the oxygen detector, and specifically, as shown in fig. 3, the data preprocessing component 102 includes:
and the combustion chamber data preprocessing triggering module 1021 is used for issuing a triggering instruction to the combustion chamber data preprocessing module 1022.
A combustion chamber data pre-processing module 1022; the combustion cavity data preprocessing module 1022 acquires pressure, temperature and humidity in each opened combustion chamber in the trigger instruction issuing gap, and performs preprocessing, specifically, in response to the trigger instruction, eliminates abnormal values in the acquired data, and acquires average pressure P of a single combustion cavityiAverage temperature TiAnd average humidity Mi(ii) a Further obtaining average pressure of each combustion chamber
Mean temperature
And average humidity
The non-combustion state storage module 1023 is used for storing data collected by the first flow meter, the second flow meter and the oxygen detector. The non-combustion state storage module 1023 stores the data in a constantly updated manner, and therefore the non-combustion state storage module 1023 stores the latest data collected by the first flow meter, the second flow meter, and the oxygen detector.
A combustion state storage module 1024 for storing the average pressure of each combustion chamber
Mean temperature
And average humidity
The combustion state storage module 1024 stores the data in a constantly updated manner, and therefore, the latest average pressure of each combustion chamber is stored in the combustion state storage module 1024
Mean temperature
And average humidity
A first comparator 103 for calculating a difference between a target oxygen content and a current oxygen content in the exhaust gas to obtain a first variable;
the second comparator 104 is used for calculating the difference value between the average pressure of the current combustion chamber and the target pressure to obtain a second variable;
a state acquirer 105 for acquiring a second flow meter count, and calculating a current opening degree of the second regulation valve according to the second flow meter count;
and the regulator 106 is used for acquiring a target opening degree of the second regulating valve and controlling the thyristor starter to finally enable the second regulating valve to reach the target opening degree.
A trigger 107 for generating an adjustment command for controlling the second regulating valve. Specifically, the adjustment instruction generation condition is: a triggering event of reaching the adjustment command, or the average pressure of the current combustion chamber exceeding a predetermined pressure threshold, or the average temperature of the current combustion chamber exceeding a predetermined temperature threshold, or the oxygen content in the current exhaust gas being higher than a predetermined threshold.
The execution logic of the adjustment instruction is shown in fig. 4, and includes:
s101, responding to the adjusting instruction, and acquiring a first variable by the first comparator.
S102, the second comparator obtains a second variable.
S103, the regulator obtains a target flow difference value at the second flow meter according to the formula A (α) + B (β).
The target flow difference is the difference between the target flow to be adjusted and the current flow.
Where A (α) is the contribution of the target flow difference at the second flow meter corresponding to the first variable, where α identifies the first variable, and B (β) is the contribution of the target flow difference at the second flow meter corresponding to the second variable, where β identifies the second variable.
Specifically, a (α) and B (β) can be summarized by experiments according to actual needs, a schematic diagram of a (α) in the embodiment of the present invention is shown in fig. 5, a schematic diagram of B (β) is shown in fig. 6, the variation rules of a (α) and B (β) are stored in the memory, specifically, the variation rule curve of a (α) is in a parabolic branch shape in two-four quadrants and is centrosymmetric, and the variation rule curve of B (β) is also in a centrosymmetric shape in two-four quadrants.
And S104, calculating the target opening degree of the corresponding second regulating valve by the regulator according to the target flow difference value.
The first flowmeter, the second flowmeter, the pressure sensor, the temperature sensor, the humidity sensor and the oxygen detector which are arranged in the embodiment of the invention acquire data according to the settings of the first flowmeter, the second flowmeter, the pressure sensor, the temperature sensor, the humidity sensor and the oxygen detector, and transmit the data to the intelligent control device.
And S105, the state acquirer acquires the current opening degree of the second regulating valve and transmits the current opening degree to the regulator.
And S106, driving the thyristor starter by the regulator according to the current starting degree and the target starting degree.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (2)
1. A multivariable combustion control system comprising a controllable combustion gas passage, a controllable air passage, and a combustion chamber, both of which are in communication with the combustion chamber; the combustion chamber comprises a gas mixing cavity and a plurality of combustion cavities;
the controllable combustion gas passage, the controllable air passage and each combustion cavity are controlled by an intelligent control device;
each combustion cavity is internally provided with a pressure sensor, a temperature sensor and a humidity sensor which are communicated with the intelligent control device;
the intelligent control device comprises the following components:
the memory is used for storing a standard combustion chamber pressure corresponding model and a standard exhaust air content corresponding table;
the data preprocessing component is used for preprocessing data collected by the first flowmeter, the second flowmeter, the pressure sensor, the temperature sensor, the humidity sensor and the oxygen detector;
the first comparator is used for calculating the difference value between the target oxygen content and the current oxygen content in the exhaust gas to obtain a first variable;
the second comparator is used for calculating the difference value between the average pressure of the current combustion chamber and the target pressure to obtain a second variable;
the state acquirer is used for acquiring the second flowmeter count and calculating the current opening degree of the second regulating valve according to the second flowmeter count;
the regulator is used for obtaining the target opening degree of the second regulating valve and controlling the thyristor starter to finally enable the second regulating valve to reach the target opening degree;
the trigger is used for generating an adjusting instruction for controlling the second regulating valve;
execution logic of the adjustment instruction, comprising:
s101, responding to the adjusting instruction, and acquiring a first variable by the first comparator;
s102, the second comparator obtains a second variable;
s103, the regulator is adjusted according to the formula
Acquiring a target flow difference value at the second flow meter; wherein
A contribution value of a target flow rate difference at a second flow meter corresponding to the first variable, wherein
Identifying a first variable;
a contribution value of a target flow rate difference at a second flow meter corresponding to a second variable, wherein
Identifying a second variable;
the shape of the change rule curve in the second quadrant and the fourth quadrant is a branch of a parabola and is centrosymmetric,
the shape of the change rule curve in the second quadrant and the fourth quadrant is also centrosymmetric;
s104, the regulator calculates the target opening degree of the corresponding second regulating valve according to the target flow difference value;
s105, the state acquirer acquires the current opening degree of the second regulating valve and transmits the current opening degree to the regulator;
s106, driving the thyristor starter by the regulator according to the current starting degree and the target starting degree;
in the controllable combustion gas passage, combustion gas enters the gas mixing cavity through a first regulating valve, in the controllable air passage, air enters the gas mixing cavity through a second regulating valve, a first flowmeter is arranged at the first regulating valve, a second flowmeter is arranged at the second regulating valve, and the first flowmeter and the second flowmeter are both connected with the intelligent control device;
an oxygen detector is further arranged in the exhaust device and is in communication connection with the control device, so that the control device can conveniently acquire the current oxygen content in the exhaust gas;
the standard combustion chamber pressure corresponding model takes the opening number of the combustion chambers, the counting number of the first flow meters, the combustion mode of the combustion chambers, the current humidity of the combustion chambers and the current temperature of the combustion chambers as independent variables and takes the target pressure in the combustion chambers as a dependent variable; the air content corresponding table in the standard exhaust gas takes the opening number of the combustion chambers, the counting number of the first flow meter and the combustion mode of the combustion chambers as independent variables, and takes the target oxygen content in the exhaust gas as a dependent variable.
2. The multivariable combustion control system of claim 1,
the adjusting instruction generating condition is as follows: a trigger event to the adjustment instruction is reached, the trigger event to the adjustment instruction comprising: the average pressure of the current combustion chamber exceeds a predetermined pressure threshold, or the average temperature of the current combustion chamber exceeds a predetermined temperature threshold, or the oxygen content of the current exhaust gas is higher than a predetermined threshold.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810883914.5A CN108916908B8 (en) | 2018-08-06 | 2018-08-06 | Multivariable combustion control system |
| CN202010209008.4A CN111336511A (en) | 2018-08-06 | 2018-08-06 | Multivariable combustion control system based on full-automatic control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810883914.5A CN108916908B8 (en) | 2018-08-06 | 2018-08-06 | Multivariable combustion control system |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010209008.4A Division CN111336511A (en) | 2018-08-06 | 2018-08-06 | Multivariable combustion control system based on full-automatic control |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| CN108916908A CN108916908A (en) | 2018-11-30 |
| CN108916908B true CN108916908B (en) | 2020-06-09 |
| CN108916908B8 CN108916908B8 (en) | 2020-07-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810883914.5A Active CN108916908B8 (en) | 2018-08-06 | 2018-08-06 | Multivariable combustion control system |
| CN202010209008.4A Withdrawn CN111336511A (en) | 2018-08-06 | 2018-08-06 | Multivariable combustion control system based on full-automatic control |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010209008.4A Withdrawn CN111336511A (en) | 2018-08-06 | 2018-08-06 | Multivariable combustion control system based on full-automatic control |
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| CN (2) | CN108916908B8 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4114545B2 (en) * | 2003-05-30 | 2008-07-09 | 株式会社ノーリツ | Gas combustion equipment |
| US8906301B2 (en) * | 2009-09-15 | 2014-12-09 | General Electric Company | Combustion control system and method using spatial feedback and acoustic forcings of jets |
| CN205535934U (en) * | 2016-03-25 | 2016-08-31 | 扬州斯大锅炉有限公司 | Reduce boiler that oxynitrides discharged |
-
2018
- 2018-08-06 CN CN201810883914.5A patent/CN108916908B8/en active Active
- 2018-08-06 CN CN202010209008.4A patent/CN111336511A/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| CN108916908A (en) | 2018-11-30 |
| CN111336511A (en) | 2020-06-26 |
| CN108916908B8 (en) | 2020-07-03 |
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Effective date of registration: 20200528 Address after: 324022 No.45, Tianhu South Road, Qujiang District, Quzhou City, Zhejiang Province Applicant after: QUZHOU DONGGANG ENVIRONMENTAL PROTECTION THERMAL POWER Co.,Ltd. Address before: 476, 4 floor, building A, 3 building, No. 301 foreshore Road, Changhe Road, Binjiang District, Zhejiang, Hangzhou, China 310052 Applicant before: HANGZHOU YITU NETWORK TECHNOLOGY Co.,Ltd. |
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| CI03 | Correction of invention patent | ||
| CI03 | Correction of invention patent |
Correction item: Patentee|Address|Patent agency|Agent Correct: Quzhou Donggang environmental protection Thermal Power Co., Ltd|324022 45 Tianhu South Road, Qujiang District, Quzhou City, Zhejiang Province|Hangzhou Jubang Intellectual Property Agency Co., Ltd.33269|Peng Youyi False: Hangzhou Yitu Network Technology Co., Ltd.|310052 Room 476, 4th Floor, Building A, No. 301, Binxing Road, Changhe Street, Binjiang District, Hangzhou, Zhejiang Province|nothing Number: 24-01 Page: The title page Volume: 36 Correction item: Patentee|Address|Patent agency|Agent Correct: Quzhou Donggang environmental protection Thermal Power Co., Ltd|324022 45 Tianhu South Road, Qujiang District, Quzhou City, Zhejiang Province|Hangzhou Jubang Intellectual Property Agency Co., Ltd.33269|Peng Youyi False: Hangzhou Yitu Network Technology Co., Ltd.|310052 Room 476, 4th Floor, Building A, No. 301, Binxing Road, Changhe Street, Binjiang District, Hangzhou, Zhejiang Province|nothing Number: 24-01 Volume: 36 |