CN102221221B - The industrial furnace gaseous-pressure hierarchical control method of pulse-combustion - Google Patents
The industrial furnace gaseous-pressure hierarchical control method of pulse-combustion Download PDFInfo
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- CN102221221B CN102221221B CN201110076914.2A CN201110076914A CN102221221B CN 102221221 B CN102221221 B CN 102221221B CN 201110076914 A CN201110076914 A CN 201110076914A CN 102221221 B CN102221221 B CN 102221221B
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Abstract
The invention discloses a kind of industrial furnace gaseous-pressure hierarchical control method of pulse-combustion, namely according to industrial furnace work load situation, gaseous-pressure is divided into two-layer, and corresponding industrial furnace normal duty and Smaller load duty; Adopt two-way combustion gas control loop to carry out gaseous-pressure control, pressure transmitter gathers gaseous-pressure information and feeds back each control valve and regulates aperture; When industrial furnace is in normal duty duty, in a road combustion gas control loop, control valve is open-minded, and the aperture of this control valve is operated in 20-100%, and in another road combustion gas control loop, control valve is closed; When industrial furnace is in Smaller load duty, in a road combustion gas control loop, control valve is closed, and in another road combustion gas control loop, control valve is open-minded, and the aperture of this control valve is operated in 20-100%.This method overcomes the defect of traditional stove gaseous-pressure list control valve circuit controls, improves the linearity that control valve regulates, ensure that the control accuracy of gaseous-pressure.
Description
Technical field
The present invention relates to a kind of industrial furnace gaseous-pressure hierarchical control method of pulse-combustion.
Background technology
Its gaseous-pressure of the industrial furnace of usual pulse-combustion controls with stove cavity and whole duty integrally, the single control valve unity loop control of most employing, it is provided with flow detector, control valve in a control loop, the gas header pipe that control loop end is located at by pressure transmitter gathers gaseous-pressure information, realizes gaseous-pressure by regulable control valve opening and control; This single control valve single loop is under the prerequisite ensureing gas-flow flux under stove normal duty, and when stove is operated in Smaller load duty, it is interval that less gas-flow flux causes by-pass valve control to be operated in less aperture.Due to the restriction of by-pass valve control equipment self-characteristic, the linearity that the aperture interval that by-pass valve control is less causes by-pass valve control to regulate reduces greatly, cause stove gaseous-pressure control accuracy poor, considerable influence is produced to Control for Kiln Temperature precision, heating material quality and energy consumption.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of industrial furnace gaseous-pressure hierarchical control method of pulse-combustion, this control method overcomes the defect of traditional stove gaseous-pressure list control valve unity loop control, improve the linearity that control valve regulates, ensure that 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 of control valve formation, pressure transmitter is located on described combustion gas control loop end gas header pipe, and gathering gaseous-pressure information feed back to controller by control valve regulating gas pressure, this method comprises the steps:
Step one, according to industrial furnace work load situation, gaseous-pressure is divided into two-layer, and the normal duty of corresponding industrial furnace and Smaller load duty;
Step 2, the gaseous-pressure adopting combustion gas control loop described in two-way to carry out industrial furnace control, and described pressure transmitter gathers gaseous-pressure information and feeds back to control valve regulable control valve opening in each combustion gas control loop;
Step 3, according to gaseous-pressure layering, when industrial furnace is in normal duty duty, wherein correspond to control valve in a road combustion gas control loop of stove normal duty duty open-minded, 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 stove Smaller load duty;
Step 4, according to gaseous-pressure layering, when industrial furnace is in Smaller load duty, close corresponding to the control valve in stove normal duty duty Xia mono-tunnel combustion gas control loop, open-minded corresponding to control valve in another road combustion gas control loop under stove Smaller load duty, 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 have employed technique scheme, namely according to industrial furnace work load situation, gaseous-pressure is divided into two-layer, and the normal duty of corresponding industrial furnace and Smaller load duty; The gaseous-pressure adopting two-way combustion gas control loop to carry out industrial furnace controls, and pressure transmitter gathers gaseous-pressure information and feeds back control valve regulable control valve opening in each combustion gas control loop; According to gaseous-pressure layering, when industrial furnace is in normal duty duty, in a road combustion gas control loop, control valve is open-minded, and the aperture of this control valve is operated in 20-100%, and in another road combustion gas control loop, control valve is closed; When industrial furnace is in Smaller load duty, in a road combustion gas control loop, control valve is closed, and in another road combustion gas control loop, control valve is open-minded, and the aperture of this control valve is operated in 20-100%.This control method overcomes the defect of traditional stove gaseous-pressure list control valve unity loop control, improves the linearity that control valve regulates, ensure that the control accuracy of gaseous-pressure.
Accompanying drawing explanation
Below in conjunction with drawings and embodiments, the present invention is described in further detail:
Fig. 1 is the schematic diagram arranging two-way combustion gas control loop in this control method.
Detailed description of the invention
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 of control valve formation, pressure transmitter is located on described combustion gas control loop end gas header pipe, and gathering gaseous-pressure information feed back to controller by control valve regulating gas pressure, this method comprises the steps:
Step one, according to industrial furnace work load situation, gaseous-pressure is divided into two-layer, and the normal duty of corresponding industrial furnace and Smaller load duty;
Step 2, the gaseous-pressure adopting combustion gas control loop described in two-way to carry out industrial furnace control, and described pressure transmitter gathers gaseous-pressure information and feeds back to control valve regulable control valve opening in each combustion gas control loop;
Step 3, according to gaseous-pressure layering, when industrial furnace is in normal duty duty, wherein correspond to control valve in a road combustion gas control loop of stove normal duty duty open-minded, the aperture of this control valve is operated in 20-100%, and the control valve in another road combustion gas control loop under corresponding stove Smaller load duty is closed;
Step 4, according to gaseous-pressure layering, when industrial furnace is in Smaller load duty, close corresponding to control valve in a road combustion gas control loop of stove normal duty duty, open-minded corresponding to control valve in another road combustion gas control loop of stove Smaller load duty, the aperture of this control valve is operated in 20-100%.
Such as, according to gas-flow flux under stove different operating load, gaseous-pressure is controlled to be divided into two-layer range restraint, the normal live load of the corresponding stove of this two-layer interval difference and Smaller load, as shown in Figure 1, the gaseous-pressure that this two-layer interval adopts two-way combustion gas control loop to carry out stove controls, after connecting, row is in parallel again forms two-way combustion gas control loop for each flow detector 2 and control valve 1, control valve in two-way combustion gas control loop adopts the control valve of large discharge and low discharge respectively, pressure transmitter 3 is located on control loop end gas header pipe, and the control valve 1 in gaseous-pressure information feed back to each road combustion gas control loop is implemented gaseous-pressure control,
When ground floor is interval, when ensureing stove normal duty, stove gaseous-pressure controls to adopt the control loop in ground floor interval to regulate, and now the control valve of the interval combustion gas control loop of the second layer is closed.The control valve of the interval combustion gas control loop of ground floor can be operated in ideal aperture interval, generally the control valve aperture of work in this interval is set in 20%-100%;
When the second layer is interval, when stove Smaller load, gas-flow flux is less.As adopted the interval combustion gas control loop of ground floor to regulate, control valve aperture need be less than 15%, and now control valve tuning linearity is poor, and pressure oscillation is large, and control accuracy is low.Now gaseous-pressure can be controlled to switch to the interval combustion gas control loop of the second layer to regulate, now the control valve of the interval combustion gas control loop of ground floor is closed.Generally gas-flow flux under stove Smaller load is set in 20%-100% in the control valve aperture of this layer of interval combustion gas control loop.
It is interval that this control method makes the control valve of each combustion gas control loop be operated in ideal aperture, between the small guide vane regulatory region avoiding control valve, makes full use of the good control characteristic of control valve interval, effectively improve gaseous-pressure control accuracy; Two control loops are furnished with flow detection instrument respectively and detect the gas-flow flux of respective interval combustion gas control loop respectively.When combustion gas rill flux, compare traditional unity loop control, adopt this control method that gaseous-pressure control accuracy can be made to improve 30%-60%, thus effectively improve Control for Kiln Temperature precision, heating material 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 of control valve formation, pressure transmitter is located on described combustion gas control loop end gas header pipe, and gather gaseous-pressure information feed back to controller by control valve regulating gas pressure, it is characterized in that this method comprises the steps:
Step one, according to industrial furnace work load situation, gaseous-pressure is divided into two-layer, and the normal duty of corresponding industrial furnace and Smaller load duty;
Step 2, the gaseous-pressure adopting combustion gas control loop described in two-way to carry out industrial furnace control, and described pressure transmitter gathers gaseous-pressure information and feeds back to control valve regulable control valve opening in each combustion gas control loop;
Step 3, according to gaseous-pressure layering, when industrial furnace is in normal duty duty, wherein correspond to control valve in a road combustion gas control loop of stove normal duty duty open-minded, 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 stove Smaller load duty;
Step 4, according to gaseous-pressure layering, when industrial furnace is in Smaller load duty, close corresponding to control valve in the combustion gas control loop under stove normal duty duty, open-minded corresponding to control valve in another road combustion gas control loop under stove Smaller load duty, the aperture of this control valve is operated in 20-100%.
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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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| CN102221221B true CN102221221B (en) | 2016-01-20 |
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| 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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| JPH01281308A (en) * | 1988-05-02 | 1989-11-13 | Naotaka Ogawa | Pulse variable combustion method and pulse variable combustion device |
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| 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 |
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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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