CN102937382B - Adjusting and optimizing method of ratio-controlled combustion system - Google Patents
Adjusting and optimizing method of ratio-controlled combustion system Download PDFInfo
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- CN102937382B CN102937382B CN201210474362.5A CN201210474362A CN102937382B CN 102937382 B CN102937382 B CN 102937382B CN 201210474362 A CN201210474362 A CN 201210474362A CN 102937382 B CN102937382 B CN 102937382B
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Abstract
The invention discloses an adjusting and optimizing method of a ratio-controlled combustion system. The adjusting and optimizing method includes the following steps: S1 the whole ratio-controlled combustion system is divided into a plurality of combustion areas, and different temperatures are set for the combustion areas for combustion control; S2 coal gas flow is adjusted; S3 air flow is adjusted; and S4 flue gas content is measured: a portable flue gas analyzer is adopted to measure contents of oxygen and carbonic oxide which are contained in flue gases of each burner arranged in the same combustion area, the coal gas flow and the air flow are readjusted if the difference value of the measurement valve and the originally set value is larger than the preset value, and adjusting and optimizing are completed if the measurement valve is identical to the originally set value. The adjusting and optimizing method especially aims at the ratio-controlled combustion system, and is simple and convenient to operate and convenient to popularize; and integrally adjusts and optimizes all the combustion areas, can ensure that the burners of all the combustion areas are identical in power and combustion state, enables temperature in a furnace to be uniformly controlled, and improves control accuracy in low load.
Description
Technical field
The present invention relates to gas combustion system adjustment and optimization field, particularly relate to the tuning of the gas combustion system that ratio controls.
Background technology
The combustion system that ratio controls mainly applies to annealing furnace, major parameter for evaluating annealing furnace operation conditions has: the output of stove, Fuel Consumption, the thermal efficiency etc. of stove, at present in part iron enterprise, due to a variety of causes, to understanding shortcoming and the equipment of annealing furnace thermal property importance, technology, the problems such as expense, many annealing furnaces have produced for many years all, but its combustion system all never carried out tuning, the heating efficiency of many annealing furnaces is caused all to be not in full use, furnace output is caused to decline, the thermal efficiency reduces, the consequences such as the serious and toxic emission of energy waste exceeds standard, therefore, be necessary regularly to carry out tuning to the combustion system of stove.
The tuning of traditional combustion system is just for the tuning of single burner, make the abundant mixed combustion of the space gas of single burner, this tuning method does not require that the burner power of the same area is the same, therefore in-furnace temperature controls often even not, and control accuracy is lower under underload, be difficult to the requirement meeting some special thermal treatment techniques.The tuning method of conventional combustion systems can not be applicable to ratio and control lower combustion system.
Summary of the invention
The technical problem to be solved in the present invention is the combustion system that can not be applicable to for the tuning method of conventional combustion systems in prior art under ratio control, and the defect of tuning poor effect, there is provided a kind of special in proportion control combustion system, overall tuning can be carried out to each combustion zone, ensure that the burner power of each combustion zone is the same, fired state is the same, makes in-furnace temperature control evenly, the tuning method of the combustion system that the accurate ratio of space gas Small Flow Control controls.
The technical solution adopted for the present invention to solve the technical problems is:
The tuning method of the combustion system providing a kind of ratio to control, comprises the following steps:
S1, the combustion system that whole ratio controls is divided into several combustion zones, and sets different temperature to each combustion zone to carry out Combustion System;
S2, adjustment gas flow, make the coal gas pressure reduction before each burner in same combustion zone reach consistent, and match with the metered flow of each burner;
S3, adjustment air mass flow, make the air pressure difference before each burner in same combustion zone reach consistent, and match with the metered flow of each burner;
S4, measurement smoke components, oxygen after each burner in same combustion zone in flue gas and carbon monoxide content is measured with Portable smoke analysis instrument, if the difference of measured value and former setting value is greater than preset value, then readjust gas flow and air mass flow, if measured value is consistent with former setting value, then tuning terminates.
In tuning method of the present invention, step S2 specifically comprises:
S21, the specified gas flow obtaining burner in combustion zone, flow-through orifice setting differential pressure, and the specified gas flow of this combustion zone;
S22, guarantee that on-the-spot all burners are all in fired state;
S23, air controller got to manually and progressively output increased to 100%;
S24, gas control got to manually and progressively output increased to 100%, and checking whether combustion zone gas flow exceedes 5% of specified gas flow, if exceeded, then checking combustion zone gas pressure setting value; If this district's gas pressure is normal, close the control valve for coal gas of this combustion zone, and reduce the gas flow of each burner by flow control valve before each burner of adjustment;
S25, use portable difference gauge to measure gas differential pressure before combustion zone each burner, and by regulating gas flow control valve, carrying out the adjustment of burner gas balance, the metered flow of differential pressure and each burner is matched;
S26, repeat the adjustment of 2 to 3 burner gas balances, until the coal gas pressure reduction before each burner in this district reaches consistent.
After S27, adjustment, burner controller is returned automatic mode.
In tuning method of the present invention, step S3 specifically comprises:
Before S31, adjustment, guarantee that the nominal air flow of each burner during blowing out has used cold air to verify;
S32, air controller got to manually and progressively output increased to 100%;
S33, use portable difference gauge to measure air differential before each burner of this district, and by regulating both air flow modulation hand-operated valve, carrying out the adjustment of burner air balance, the metered flow of differential pressure and each burner is matched;
S34, repeat the adjustment of 2 to 3 burner air balances, until the air pressure difference before each burner in this district reaches consistent.
The beneficial effect that the present invention produces is: the present invention is according to the subregion of combustion system, when ensureing that single zonal combustion power is constant, portable difference gauge is used to measure coal gas before each burner in each region, air differential, and by regulating coal gas and air flow rate adjustment valve, the coal gas of each burner of same combustion zone and air differential are matched with corresponding metered flow, namely burner power and the fired state of same combustion zone is balanced, make the operation that whole combustion system is stable like this, each relevant parameter is in optimum proportioning state simultaneously, sufficient combustion, the thermal efficiency is high, Production requirement is met with minimum energy resource consumption.Tuning method of the present invention is specially for proportion control combustion system, simple, convenient, is convenient to promote; Carry out overall tuning to each combustion zone, can ensure that the burner power of each combustion zone is the same, fired state is the same, and in-furnace temperature is controlled evenly, and under underload, control accuracy is high.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the combustion system block diagram that embodiment of the present invention ratio controls;
Fig. 2 is the flow chart of the tuning method of the combustion system that embodiment of the present invention ratio controls.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The tuning of combustion system in iron and steel enterprise should be important, tuning by inquiry, the judgement of science can be made to the Actual combustion situation of annealing furnace, find out to have and optimize the burner in space, made by tuning that the production capacity of annealing furnace improves, combustion thermal efficiency improves, minimizing energy waste.As shown in Figure 1, be combustion system block diagram that the ratio of embodiment of the present invention institute tuning controls.Device identical in figure uses identical symbol to represent.In addition in figure, FT represents flow instrumentation, and TE represents temperature instrument, and PT represents pressure instrumentation.
The enforcement preparation of this method and condition:
The first, the instrument that prepare has: flue gas analyzer, digital differential pressure table, portable gas alarm instrument and a common tool case etc.;
The second, status of equipment must meet tuning condition, and the supply of (1) coal gas is normal, and pressure meets production requirement; (2) combustion fan, smoke exhaust fan are working properly; (3) coal gas, air duct pressure-regulating valve, cutting valve, hand valve etc. soon can normal switch.
Three, select suitable steel grade normally to produce continuously, ensure that the combustion power in tuning region reaches 100% and remains unchanged.
As shown in Figure 2, the tuning method of the combustion system that embodiment of the present invention ratio controls, comprises the following steps:
S1, the combustion system that whole ratio controls is divided into several combustion zones, and sets different temperature to each combustion zone to carry out Combustion System;
S2, adjustment gas flow, make the coal gas pressure reduction before each burner in same combustion zone reach consistent, and match with the metered flow of each burner;
S3, adjustment air mass flow, make the air pressure difference before each burner in same combustion zone reach consistent, and match with the metered flow of each burner;
S4, measure smoke components, measure oxygen after each burner in same combustion zone in flue gas and carbon monoxide content with Portable smoke analysis instrument;
S5, judge whether the difference of measured value and former setting value is greater than preset value; If so, then readjust gas flow and air mass flow, if measured value is less than or equal to former setting value unanimously, then tuning terminates.
Step S2 specifically comprises in one embodiment of the invention:
S21, the specified gas flow obtaining burner in combustion zone, flow-through orifice setting differential pressure, and the specified gas flow of this combustion zone (the burner quantity in this district of the single flow * of combustion zone burner);
S22, guarantee that on-the-spot all burners are all in fired state;
S23, air controller got to manually and progressively output increased to 100%;
S24, gas control got to manually and progressively output increased to 100%, and checking whether combustion zone gas flow exceedes 5% of specified gas flow, if exceeded, then checking combustion zone gas pressure setting value; If this district's gas pressure is normal, the control valve for coal gas of this combustion zone can be closed a little, can at HMI(Human Machine Interface) operation screen carries out, and reduce the gas flow of each burner by flow control valve before each burner of adjustment; Open at control valve for coal gas 100%, and under not exceeding the specified gas flow situation in this combustion zone, burner regulates and can carry out;
S25, after completing above-mentioned steps on request, portable difference gauge can be used to measure gas differential pressure before combustion zone each burner, and by regulating gas flow control valve, carrying out the adjustment of burner gas balance, the metered flow of differential pressure and each burner is matched;
S26, repeat the adjustment of 2 to 3 burner gas balances, until the coal gas pressure reduction before each burner in this district reaches consistent.
After S27, adjustment, burner controller is returned automatic mode.
Step S3 specifically comprises:
Before S31, adjustment, guarantee that the nominal air flow of each burner during blowing out has used cold air to verify;
S32, air controller got to manually and progressively output increased to 100%;
S33, use portable difference gauge to measure air differential before each burner of this district, and by regulating both air flow modulation hand-operated valve, carrying out the adjustment of burner air balance, the metered flow of differential pressure and each burner is matched;
S34, repeat the adjustment of 2 to 3 burner air balances, until the air pressure difference before each burner in this district reaches consistent.
After space gas Flow-rate adjustment, use Portable smoke analysis instrument to measure oxygen after each burner in flue gas and carbon monoxide content, measured value should be close, and consistent with former setting value.If there is relatively large deviation, then need to re-start adjustment according to above-mentioned steps.
Repeatedly debugged by above method, the burner of same combustion zone is made all to be operated in its rated power (balancing the burner power of same combustion zone), and each burner is operated in normal fired state and produces the flue gas (balancing each burner combustion state) of same remaining oxygen, like this, behind debugging full combustion zone, the operation that whole combustion system is stable is made, each relevant parameter is in optimum proportioning state simultaneously, sufficient combustion, the thermal efficiency is high, meets Production requirement with minimum resource consumption.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.
Claims (2)
1. a tuning method for the combustion system of ratio control, is characterized in that, comprise the following steps:
S1, the combustion system that whole ratio controls is divided into several combustion zones, and sets different temperature to each combustion zone to carry out Combustion System;
S2, adjustment gas flow, make the coal gas pressure reduction before each burner in same combustion zone reach consistent, and match with the specified gas flow of each burner;
S3, regulate air mass flow, make the air pressure difference before each burner in same combustion zone reach consistent, and with the nominal air flows match of each burner;
S4, measurement smoke components, oxygen after each burner in same combustion zone in flue gas and carbon monoxide content is measured with Portable smoke analysis instrument, if the difference of measured value and former setting value is greater than preset value, then readjust gas flow and air mass flow, if measured value is consistent with former setting value, then tuning terminates;
Wherein, step S3 specifically comprises:
Before S31, adjustment, guarantee that the nominal air flow of each burner during blowing out has used cold air to verify;
S32, air controller got to manually and progressively output increased to 100%;
S33, use portable difference gauge to measure air differential before each burner of this district, and by regulating both air flow modulation hand-operated valve, carrying out the adjustment of burner air balance, making the nominal air flows match of differential pressure and each burner;
S34, repeat the adjustment of 2 to 3 burner air balances, until the air pressure difference before each burner in this district reaches consistent.
2. tuning method according to claim 1, it is characterized in that, step S2 specifically comprises:
S21, the specified gas flow obtaining burner in combustion zone, flow-through orifice setting differential pressure, and the specified gas flow of this combustion zone;
S22, guarantee that on-the-spot all burners are all in fired state;
S23, air controller got to manually and progressively output increased to 100%;
S24, gas control got to manually and progressively output increased to 100%, and checking whether combustion zone gas flow exceedes 5% of specified gas flow, if exceeded, then checking combustion zone gas pressure setting value; If this district's gas pressure is normal, close the control valve for coal gas of this combustion zone, and reduce the gas flow of each burner by flow control valve before each burner of adjustment;
S25, use portable difference gauge to measure gas differential pressure before combustion zone each burner, and by regulating gas flow control valve, carrying out the adjustment of burner gas balance, the specified gas flow of differential pressure and each burner is matched;
S26, repeat the adjustment of 2 to 3 burner gas balances, until the coal gas pressure reduction before each burner in this district reaches consistent;
After S27, adjustment, burner controller is returned automatic mode.
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| CN201210474362.5A CN102937382B (en) | 2012-11-21 | 2012-11-21 | Adjusting and optimizing method of ratio-controlled combustion system |
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| CN201210474362.5A CN102937382B (en) | 2012-11-21 | 2012-11-21 | Adjusting and optimizing method of ratio-controlled combustion system |
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| CN102937382B true CN102937382B (en) | 2015-05-27 |
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| CN104654819B (en) * | 2014-05-23 | 2017-03-01 | 柳州钢铁股份有限公司 | Larger gas store the temperature-controlled process of stove |
| CN105865217B (en) * | 2016-04-21 | 2018-03-13 | 中冶南方工程技术有限公司 | A kind of roaster burner gas flow control method |
| CN106801139A (en) * | 2017-01-19 | 2017-06-06 | 本钢板材股份有限公司 | Annealing furnace optimization of air-fuel ratio method |
| CN107763656A (en) * | 2017-11-17 | 2018-03-06 | 江苏闳业机械股份有限公司 | A kind of compounding machine flame system fuel gas mechanism |
| CN109112288B (en) * | 2018-06-29 | 2020-02-21 | 首钢京唐钢铁联合有限责任公司 | Temperature adjusting method of annealing furnace |
| CN109357258B (en) * | 2018-10-10 | 2019-10-29 | 首钢京唐钢铁联合有限责任公司 | A kind of method and device adjusting burner air-fuel ratio |
| CN111811257B (en) * | 2020-06-16 | 2021-12-21 | 首钢京唐钢铁联合有限责任公司 | Heating furnace combustion control method and device |
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| JP2726403B2 (en) * | 1995-12-18 | 1998-03-11 | 中外炉工業株式会社 | Bell type annealing furnace |
| CN1332152C (en) * | 2003-04-11 | 2007-08-15 | 株式会社庆东纳碧安 | Air proportional boiler using air pressure sensor |
| CN200940836Y (en) * | 2006-08-14 | 2007-08-29 | 中冶京诚工程技术有限公司 | Pulse controller of burner |
| CN101655245B (en) * | 2009-09-04 | 2011-03-16 | 江苏焱鑫科技股份有限公司 | Multiparameter automatic control method of industrial furnace burner |
| CN202274761U (en) * | 2011-10-21 | 2012-06-13 | 无锡市凯天环保科技有限公司 | Heating furnace oxidation burning loss optimization atmosphere burning automatic control device |
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