CN105674324A - Negative pressure combustor capable of automatically adjusting air excess coefficient - Google Patents
Negative pressure combustor capable of automatically adjusting air excess coefficient Download PDFInfo
- Publication number
- CN105674324A CN105674324A CN201610084203.2A CN201610084203A CN105674324A CN 105674324 A CN105674324 A CN 105674324A CN 201610084203 A CN201610084203 A CN 201610084203A CN 105674324 A CN105674324 A CN 105674324A
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- CN
- China
- Prior art keywords
- air
- negative pressure
- pressure
- burner hearth
- furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/04—Regulating fuel supply conjointly with air supply and with draught
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2239/00—Fuels
- F23N2239/04—Gaseous fuels
Abstract
A negative pressure combustor capable of automatically adjusting an air excess coefficient is mainly composed of a hearth, a PLC, a combustor body and an environment temperature detector. A pressure sensor is arranged in the heath, and an adjusting baffle is arranged in a chimney of the hearth; an air volume adjustor is arranged in an air inlet of the combustor body, and a flow meter and an air flow adjustor are arranged on a gas inlet pipe of the hearth; and an environment temperature detector, the adjusting baffle, the pressure sensor, the air volume adjustor, the flow meter and the air flow adjustor are connected with the PLC. According to the combustor, the air excess coefficient can be greatly reduced, forced ventilation of a negative pressure furnace is achieved, and therefore the combustion efficiency of the combustor is improved; the furnace efficiency of an existing negative pressure furnace can be improved, and even, use and popularization of the negative pressure furnace can be expanded; and because the negative pressure furnace does not need an air blower, power consumption can be reduced.
Description
Technical field
The present invention relates to a kind of negative-pressure firing device, be specifically related to the negative-pressure firing device of a kind of automatic adjustment coefficient of excess air.
Background technology
Needing combustion air during burning, provide (forced ventilation) typically via aerator, if chimney is tall and big, captivation is strong, it is possible to without aerator, and such boiler is called negative pressure stove. Because having inhomogeneities when fuel and air mixing, for ensureing that fuel makes full use of, amount of supplied air is more more than calculated value, is called that coefficient of excess air, the coefficient of excess air of national regulations gas burner are 1.2. Negative-pressure firing relies on tall and big chimney to produce captivation, the change of the environment impact on tall and big chimney, it is far longer than the common chimney of force ventilated burner, during for ensureing that air capacity is minimum, fuel can make full use of, and has to increase coefficient of excess air during debugging, and some oil fields specify that the standard of the coefficient of excess air of negative pressure stove is 1.6, actually detected have up to 1.7 or 1.8, cause negative pressure stove stove effect very low. Such as the coefficient of excess air 1.6 of negative pressure burner, the ratio coefficient of excess air 1.2 of forced-draft burner, add 1/3rd, say, that it is dispensable that fuel consumption adds 2.9% these fuel consumptions, should reduce. Current negative-pressure firing device adopts zirconium oxide on-line monitoring, O in detection flue gas mostly2Content, if O2Content increases, illustrate that extraneous factor impact causes air capacity to increase, control system can damper baffle plate, reducing intake, this way can effectively revise the extraneous factor impact on combustion-supporting air quantity, but zirconic costly, life-span is very short, within being typically in 1 year, cost performance is undesirable, it is necessary to find a better way.
Summary of the invention
The invention provides the negative-pressure firing device of a kind of automatic adjustment coefficient of excess air, the coefficient of excess air height existed to solve prior art causes the problem that negative pressure stove efficiency of combustion is low.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of negative-pressure firing device of automatic adjustment coefficient of excess air, mainly it is made up of burner hearth, PLC, burner and ambient temperature sensor, pressure transducer is set in burner hearth, the chimney of burner hearth arranges controllable register, the air inlet of burner arranges blast regulator, arranging effusion meter and air volume regulator on the gas inlet pipe of burner hearth, ambient temperature sensor, controllable register, pressure transducer, blast regulator, effusion meter are connected with PLC respectively with air volume regulator.
The operation principle of the present invention is:
The flue gas that combustion air and burning produce, has certain resistance during by chimney, chimney produces again certain captivation. If resistance ratios captivation is big, the pressure of burner hearth is just high than atmospheric pressure, and it is how many how many height is called back pressure, and unit is Pa; If resistance ratios captivation is little, the pressure of burner hearth just forces down than air, is called for short negative pressure. Extraneous factor affects the captivation of chimney, also just have impact on the pressure of burner hearth, by detecting the change of furnace pressure, and then regulation and control furnace pressure, it is possible to revise the extraneous factor impact on combustion-supporting air quantity, reduce coefficient of excess air, improve negative-pressure firing efficiency. Affect six factors of furnace pressure: exhaust gas temperature and ambient temperature are principal element; Gas flow and combustion air flow are modifying factor; Blow and air humidity is uncontrollable factor. Principal element and modifying factor can know concrete numerical value by detection and setting value, and by calculating furnace pressure, we have been set up the mathematical model of several variable by experiment, have found Changing Pattern. PLC, by detecting the change of burner hearth back pressure, adjusts flue damper automatically, controls combustion air flow, it is ensured that sufficient combustion, it is possible to makes negative pressure stove reach the national standard of forced-draft burner, solves the difficult problem that negative pressure stove efficiency of combustion is low. Specific practice is mainly the Mathematical Models of PLC, and transformation chimney regulating fender is automatically adjust, and increases the detecting device of heating furnace burner hearth back pressure simultaneously, arranges ambient temperature detection device and provide corrected parameter to PLC.
Apparatus of the present invention can be substantially reduced coefficient of excess air, achieve negative pressure stove and reach the efficiency of combustion of forced-draft burner, be not only able to improve the stove effect of existing negative pressure stove, it might even be possible to expand promoting the use of of negative pressure stove, because negative pressure stove does not need aerator, decrease power consumption.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the structural representation of apparatus of the present invention.
1 burner hearth, 2PLC controller, 3 burners, 4 ambient temperature sensor, 5 chimneys, 6 controllable registers, 7 pressure transducers, 8 blast regulators, 9 effusion meters, 10 air volume regulators in figure.
Detailed description of the invention
As shown in the figure, a kind of negative-pressure firing device of automatic adjustment coefficient of excess air, mainly it is made up of burner hearth 1, PLC 2, burner 3 and ambient temperature sensor 4, pressure transducer 7 is set in burner hearth 1, the chimney 5 of burner hearth 1 arranges controllable register 6, the air inlet of burner 3 arranges blast regulator 8, arranging effusion meter 9 and air volume regulator 10 on the gas inlet pipe of burner hearth 1, ambient temperature sensor 4, controllable register 6, pressure transducer 7, blast regulator 8, effusion meter 9 are connected with PLC 2 respectively with air volume regulator 10.
The operation principle of the present invention is:
The flue gas that combustion air and burning produce, has certain resistance during by chimney, chimney produces again certain captivation. If resistance ratios captivation is big, the pressure of burner hearth is just high than atmospheric pressure, and it is how many how many height is called back pressure, and unit is Pa; If resistance ratios captivation is little, the pressure of burner hearth just forces down than air, is called for short negative pressure. Extraneous factor affects the captivation of chimney, also just have impact on the pressure of burner hearth, by detecting the change of furnace pressure, and then regulation and control furnace pressure, it is possible to revise the extraneous factor impact on combustion-supporting air quantity, reduce coefficient of excess air, improve negative-pressure firing efficiency. Affect six factors of furnace pressure: exhaust gas temperature and ambient temperature are principal element; Gas flow and combustion air flow are modifying factor; Blow and air humidity is uncontrollable factor. Principal element and modifying factor can know concrete numerical value by detection and setting value, and by calculating furnace pressure, two controlled factors are not difficult to detection and calculate the concrete numerical value of the impact on furnace pressure. The change of chimney gravitation when the two factor causes negative-pressure firing just, the coefficient of excess air affecting negative-pressure firing strengthens.
The calculating of four controllable factors
The impact of exhaust gas temperature and external air temperature, it is possible to calculate with following formula:
The draft (Pa) of Δ P chimney in Δ P=0.0345H formula;
H produces pipeline section height (m) of draft;
Ta external air temperature (DEG C);
The mean temperature (DEG C) of flue gas in tf run of designing
B atmospheric pressure (Pa).
Burner hearth back pressure and gas quantity, combustion air flow change are relevant, but are not simple proportional relations, but a functional relationship we have been set up the mathematical model of several variable by experiment, have found Changing Pattern. PLC, by detecting the change of burner hearth back pressure, adjusts flue damper automatically, controls combustion air flow, it is ensured that sufficient combustion, it is possible to makes negative pressure stove reach the national standard of forced-draft burner, solves the difficult problem that negative pressure stove efficiency of combustion is low. Specific practice is mainly the Mathematical Models of PLC, and transformation chimney regulating fender is automatically adjust, and increases the detecting device of heating furnace burner hearth back pressure simultaneously, arranges ambient temperature detection device and provide corrected parameter to PLC.
Claims (1)
1. the negative-pressure firing device of an automatic adjustment coefficient of excess air, it is characterized in that mainly being made up of burner hearth, PLC, burner and ambient temperature sensor, pressure transducer is set in burner hearth, the chimney of burner hearth arranges controllable register, the air inlet of burner arranges blast regulator, arranging effusion meter and air volume regulator on the gas inlet pipe of burner hearth, ambient temperature sensor, controllable register, pressure transducer, blast regulator, effusion meter are connected with PLC respectively with air volume regulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610084203.2A CN105674324A (en) | 2016-02-14 | 2016-02-14 | Negative pressure combustor capable of automatically adjusting air excess coefficient |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610084203.2A CN105674324A (en) | 2016-02-14 | 2016-02-14 | Negative pressure combustor capable of automatically adjusting air excess coefficient |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105674324A true CN105674324A (en) | 2016-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610084203.2A Pending CN105674324A (en) | 2016-02-14 | 2016-02-14 | Negative pressure combustor capable of automatically adjusting air excess coefficient |
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| CN (1) | CN105674324A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110791295A (en) * | 2019-11-29 | 2020-02-14 | 张家港宏昌钢板有限公司 | Airflow adjusting baffle for coke oven flue |
| CN113250799A (en) * | 2021-05-25 | 2021-08-13 | 无锡威孚环保催化剂有限公司 | Backpressure data detection method, device and system |
| CN113646584A (en) * | 2019-03-28 | 2021-11-12 | 喜德瑞集团公司 | Method for operating a premix gas burner, premix gas burner and boiler |
-
2016
- 2016-02-14 CN CN201610084203.2A patent/CN105674324A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113646584A (en) * | 2019-03-28 | 2021-11-12 | 喜德瑞集团公司 | Method for operating a premix gas burner, premix gas burner and boiler |
| CN110791295A (en) * | 2019-11-29 | 2020-02-14 | 张家港宏昌钢板有限公司 | Airflow adjusting baffle for coke oven flue |
| CN113250799A (en) * | 2021-05-25 | 2021-08-13 | 无锡威孚环保催化剂有限公司 | Backpressure data detection method, device and system |
| CN113250799B (en) * | 2021-05-25 | 2023-03-03 | 无锡威孚环保催化剂有限公司 | Backpressure data detection method, device and system |
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160615 |