CN102221221A - Gas pressure layering control method of pulse-combustion industrial furnace - Google Patents
Gas pressure layering control method of pulse-combustion industrial furnace Download PDFInfo
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- CN102221221A CN102221221A CN2011100769142A CN201110076914A CN102221221A CN 102221221 A CN102221221 A CN 102221221A CN 2011100769142 A CN2011100769142 A CN 2011100769142A CN 201110076914 A CN201110076914 A CN 201110076914A CN 102221221 A CN102221221 A CN 102221221A
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Abstract
The invention discloses a gas pressure layering control method of a pulse-combustion industrial furnace, namely, the gas pressure is divided into two layers and corresponded with normal load and small load working condition of the industrial furnace according to the workload condition of the industrial furnace, two channels gas control loops are adopted to carry out the gas pressure control, a pressure transmitter collects the gas pressure information and feedbacks to each control valve to adjust the opening; when the industrial furnace is in normal load working condition, the control valve of one channel gas control loop is conducted, the control valve opening is in 20%-100%, the control valve of the other channel is closed; when the industrial furnace is in small load working condition, the control valve of one channel gas control loop is closed, the control valve of the other channel is dredged, the control valve opening is in 20%-100%. In the invention, control defect of the traditional furnace gas pressure single control valve loop is overcome, and the adjusted linearity of the control valve is improved and the control accuracy of the gas pressure is ensured.
Description
Technical field
The present invention relates to a kind of industrial furnace gaseous-pressure hierarchical control method of pulse-combustion.
Background technology
Usually its gaseous-pressure control of the industrial furnace of pulse-combustion is done as a whole with stove cavity and whole duty, adopt single control valve single loop control mostly, it is provided with flow detector, control valve in a control loop, the combustion gas house steward that pressure transmitter is located at the control loop end goes up and gathers gaseous-pressure information, realizes gaseous-pressure control by the adjusting control valve aperture; This list control valve single loop is under the prerequisite that guarantees gas-flow flux under the stove normal duty, and when stove was operated in little load operation state, less gas-flow flux caused by-pass valve control to be operated in less aperture interval.Because by-pass valve control equipment self characteristic limitations, the linearity that the less aperture interval of by-pass valve control causes by-pass valve control to be regulated reduces greatly, cause stove gaseous-pressure control accuracy relatively poor, Control for Kiln Temperature precision, material heating quality and energy consumption are produced considerable influence.
Summary of the invention
Technical problem to be solved by this invention provides a kind of industrial furnace gaseous-pressure hierarchical control method of pulse-combustion, this control method has overcome the defective of traditional stove gaseous-pressure list control valve single loop control, improve the linearity that control valve is regulated, guaranteed the control accuracy of gaseous-pressure.
For solving the problems of the technologies described above, the industrial furnace gaseous-pressure hierarchical control method of pulse-combustion of the present invention comprises the flow detector of series connection and the combustion gas control loop that control valve constitutes, pressure transmitter is located on the terminal combustion gas house steward of described combustion gas control loop, and gather the gaseous-pressure feedback information and regulate gaseous-pressure to controller by control valve, this method comprises the steps:
Step 1, according to industrial furnace live load situation, gaseous-pressure is divided into two-layer, and the normal duty of corresponding industrial furnace and little load operation state;
Step 2, the gaseous-pressure that adopts the described combustion gas control loop of two-way to carry out industrial furnace are controlled, and described pressure transmitter is gathered gaseous-pressure information and also fed back to control valve adjusting control valve aperture in each combustion gas control loop;
Step 3, according to the gaseous-pressure layering, when industrial furnace is in the normal duty duty, wherein open-minded corresponding to control valve in one tunnel combustion gas control loop of stove normal duty duty, the aperture of this control valve is operated in 20-100%, closes corresponding to the control valve in another road combustion gas control loop under the little load operation state of stove;
Step 4, according to the gaseous-pressure layering, when industrial furnace is in little load operation state, close corresponding to the control valve in the road combustion gas control loop under the stove normal duty duty, open-minded corresponding to control valve in another road combustion gas control loop under the little load operation state of stove, the aperture of this control valve is operated in 20-100%.
Because the industrial furnace gaseous-pressure hierarchical control method of pulse-combustion of the present invention has adopted technique scheme, promptly according to industrial furnace live load situation, gaseous-pressure is divided into two-layer, and the normal duty of corresponding industrial furnace and little load operation state; Adopt two-way combustion gas control loop to carry out the gaseous-pressure control of industrial furnace, pressure transmitter is gathered gaseous-pressure information and is fed back control valve adjusting control valve aperture in each combustion gas control loop; According to the gaseous-pressure layering, when industrial furnace was in the normal duty duty, control valve was open-minded in one tunnel combustion gas control loop, and the aperture of this control valve is operated in 20-100%, and control valve is closed in another road combustion gas control loop; When industrial furnace was in little load operation state, control valve was closed in one tunnel combustion gas control loop, and control valve is open-minded in another road combustion gas control loop, and the aperture of this control valve is operated in 20-100%.This control method has overcome the defective of traditional stove gaseous-pressure list control valve single loop control, has improved the linearity that control valve is regulated, and has guaranteed the control accuracy of gaseous-pressure.
Description of drawings
The present invention is described in further detail below in conjunction with drawings and embodiments:
Fig. 1 is for being provided with the schematic diagram of two-way combustion gas control loop in this control method.
The specific embodiment
The industrial furnace gaseous-pressure hierarchical control method of pulse-combustion of the present invention comprises the flow detector of series connection and the combustion gas control loop that control valve constitutes, pressure transmitter is located on the terminal combustion gas house steward of described combustion gas control loop, and gather the gaseous-pressure feedback information and regulate gaseous-pressure to controller by control valve, this method comprises the steps:
Step 1, according to industrial furnace live load situation, gaseous-pressure is divided into two-layer, and the normal duty of corresponding industrial furnace and little load operation state;
Step 2, the gaseous-pressure that adopts the described combustion gas control loop of two-way to carry out industrial furnace are controlled, and described pressure transmitter is gathered gaseous-pressure information and also fed back to control valve adjusting control valve aperture in each combustion gas control loop;
Step 3, according to the gaseous-pressure layering, when industrial furnace is in the normal duty duty, wherein open-minded corresponding to control valve in one tunnel combustion gas control loop of stove normal duty duty, the aperture of this control valve is operated in 20-100%, and the control valve in another road combustion gas control loop under the little load operation state of corresponding stove is closed;
Step 4, according to the gaseous-pressure layering, when industrial furnace is in little load operation state, close corresponding to control valve in one tunnel combustion gas control loop of stove normal duty duty, open-minded corresponding to control valve in another road combustion gas control loop of the little load operation state of stove, the aperture of this control valve is operated in 20-100%.
For example, according to gas-flow flux under the stove different operating load gaseous-pressure control is divided into two-layer interval control, the operate as normal load and the little load of this two-layer interval corresponding stove respectively, as shown in Figure 1, this two-layer interval gaseous-pressure control of adopting two-way combustion gas control loop to carry out stove, the parallel connection of going again after each flow detector 2 and control valve 1 series connection constitutes two-way combustion gas control loop, control valve in the two-way combustion gas control loop adopts the control valve of big flow and low discharge respectively, pressure transmitter 3 is located on the terminal combustion gas house steward of control loop, and gaseous-pressure feedback information to the control valve 1 in each road combustion gas control loop is implemented gaseous-pressure control;
When ground floor was interval, under the situation that guarantees the stove normal duty, the control of stove gaseous-pressure adopted the control loop in ground floor interval to regulate, and the control valve of the interval combustion gas control loop of second layer this moment is closed.The control valve of the interval combustion gas control loop of ground floor can be operated in comparatively desirable aperture interval, and the control valve aperture of working in generally should the interval is set in 20%-100%;
When the second layer was interval, under the situation of the little load of stove, the gas-flow flux was less.As adopt the interval combustion gas control loop of ground floor to regulate, and the control valve aperture needs less than 15%, and this moment, control valve linear adjustment degree was poor, and pressure oscillation is big, and control accuracy is low.Can switch to gaseous-pressure control the interval combustion gas control loop of the second layer and regulate this moment, and the control valve of the interval combustion gas control loop of ground floor this moment is closed.Generally gas-flow flux under the little load of stove is set in 20%-100% in the control valve aperture of the interval combustion gas control loop of this layer.
This control method makes the control valve of each combustion gas control loop be operated in comparatively desirable aperture interval, avoids making full use of control valve control characteristic interval preferably between the little aperture regulatory region of control valve, effectively improves the gaseous-pressure control accuracy; Two control loops are furnished with the flow detection instrument respectively and respectively the gas-flow flux of interval combustion gas control loop are separately detected.When combustion gas rill flux, compare traditional single loop control, adopt this control method can make the gaseous-pressure control accuracy improve 30%-60%, thereby effectively improve Control for Kiln Temperature precision, material heating quality and energy-saving effect.
Claims (1)
1. the industrial furnace gaseous-pressure hierarchical control method of a pulse-combustion, comprise the flow detector of series connection and the combustion gas control loop that control valve constitutes, pressure transmitter is located on the terminal combustion gas house steward of described combustion gas control loop, and gather the gaseous-pressure feedback information and regulate gaseous-pressure to controller by control valve, it is characterized in that this method comprises the steps:
Step 1, according to industrial furnace live load situation, gaseous-pressure is divided into two-layer, and the normal duty of corresponding industrial furnace and little load operation state;
Step 2, the gaseous-pressure that adopts the described combustion gas control loop of two-way to carry out industrial furnace are controlled, and described pressure transmitter is gathered gaseous-pressure information and also fed back to control valve adjusting control valve aperture in each combustion gas control loop;
Step 3, according to the gaseous-pressure layering, when industrial furnace is in the normal duty duty, wherein open-minded corresponding to control valve in one tunnel combustion gas control loop of stove normal duty duty, the aperture of this control valve is operated in 20-100%, closes corresponding to the control valve in another road combustion gas control loop under the little load operation state of stove;
Step 4, according to the gaseous-pressure layering, when industrial furnace is in little load operation state, close corresponding to control valve in the combustion gas control loop under the stove normal duty duty, open-minded corresponding to control valve in another road combustion gas control loop under the little load operation state of stove, the aperture of this control valve is operated in 20-100%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110076914.2A CN102221221B (en) | 2011-03-29 | 2011-03-29 | The industrial furnace gaseous-pressure hierarchical control method of pulse-combustion |
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| CN201110076914.2A CN102221221B (en) | 2011-03-29 | 2011-03-29 | The industrial furnace gaseous-pressure hierarchical control method of pulse-combustion |
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| CN102221221A true CN102221221A (en) | 2011-10-19 |
| CN102221221B CN102221221B (en) | 2016-01-20 |
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Citations (6)
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| JPH0586523B2 (en) * | 1988-05-02 | 1993-12-13 | Naotaka Ogawa | |
| DE10121985A1 (en) * | 2001-05-05 | 2002-11-07 | Buderus Heiztechnik Gmbh | Control system for gas fired heating apparatus has acoustic sensor adjacent to flame whose output is compared with stored reference value to adjust gas supply |
| CN200940836Y (en) * | 2006-08-14 | 2007-08-29 | 中冶京诚工程技术有限公司 | Pulse controller of burner |
| CN101737797A (en) * | 2010-01-12 | 2010-06-16 | 中冶东方工程技术有限公司 | Pulse combustion control system and control method |
| CN101915505A (en) * | 2010-08-25 | 2010-12-15 | 中冶南方(武汉)威仕工业炉有限公司 | Device and method for rapidly reducing temperature of heat treatment furnace |
| CN201731481U (en) * | 2010-08-12 | 2011-02-02 | 机械工业第六设计研究院 | Large regulating ratio gas nozzle pulse combustion system |
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2011
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Patent Citations (6)
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| JPH0586523B2 (en) * | 1988-05-02 | 1993-12-13 | Naotaka Ogawa | |
| DE10121985A1 (en) * | 2001-05-05 | 2002-11-07 | Buderus Heiztechnik Gmbh | Control system for gas fired heating apparatus has acoustic sensor adjacent to flame whose output is compared with stored reference value to adjust gas supply |
| CN200940836Y (en) * | 2006-08-14 | 2007-08-29 | 中冶京诚工程技术有限公司 | Pulse controller of burner |
| CN101737797A (en) * | 2010-01-12 | 2010-06-16 | 中冶东方工程技术有限公司 | Pulse combustion control system and control method |
| CN201731481U (en) * | 2010-08-12 | 2011-02-02 | 机械工业第六设计研究院 | Large regulating ratio gas nozzle pulse combustion system |
| CN101915505A (en) * | 2010-08-25 | 2010-12-15 | 中冶南方(武汉)威仕工业炉有限公司 | Device and method for rapidly reducing temperature of heat treatment furnace |
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| 刘瑾: "台车式退火炉的脉冲燃烧控制系统", 《自动化与仪表》 * |
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| CN102221221B (en) | 2016-01-20 |
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Owner name: BAOSTEEL INDUSTRIAL FURNACE ENGINEERING TECHNOLOGY Free format text: FORMER OWNER: SHANGHAI BAOSTEEL INDUSTRY INSPECTION CORP. Effective date: 20130301 |
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Effective date of registration: 20130301 Address after: 201900 room 503-C, room 1, building 1508, Mudanjiang Road, Shanghai, Baoshan District, 5 Applicant after: Baosteel Industrial Furnace Engineering Technology Co., Ltd. Address before: 201900 Shanghai city Baoshan District Meipu Road No. 335 Applicant before: Shanghai Baosteel Industry Inspection Corp. |
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Effective date of registration: 20171124 Address after: 201999 Shanghai city Baoshan District Tieli Road No. 2510 room 416 Patentee after: Baosteel Engeneering &Technology Group Co., Ltd. Address before: 201900 room 503-C, room 1, building 1508, Mudanjiang Road, Shanghai, Baoshan District, 5 Patentee before: Baosteel Industrial Furnace Engineering Technology Co., Ltd. |