CN103672948A - Combustion control system and method of industrial furnace - Google Patents
Combustion control system and method of industrial furnace Download PDFInfo
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- CN103672948A CN103672948A CN201310712749.4A CN201310712749A CN103672948A CN 103672948 A CN103672948 A CN 103672948A CN 201310712749 A CN201310712749 A CN 201310712749A CN 103672948 A CN103672948 A CN 103672948A
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Abstract
The invention provides a combustion control system and method of an industrial furnace. The combustion control system of the industrial furnace comprises a laser spectrum detection device, a combustion control device, an oxidation burning loss detection device, a comparison device and a computing device, wherein the laser spectrum detection device is used for detecting the content of gas in the industrial furnace, the laser spectrum detection device comprises a laser, a detector and an analysis module, the combustion control device is used for optimizing and adjusting the combustion conditions in the industrial furnace according to data transmitted by the laser spectrum detection device, the oxidation burning loss detection device is used for detecting oxidation burning loss of workpieces which pass through the industrial furnace, and transmitting the detection result to the comparison device, the comparison device is used for obtaining the comparison result according to the received detection result and the original oxidation burning loss conditions, and transmitting the comparison result to the computing device, and the computing device is used for obtaining the combustion control result of the industrial furnace according to the received comparison result. The combustion control system and method of the industrial furnace have the advantages that detection accuracy is high, the detection speed is high, the cost is low, and energy is saved.
Description
Technical field
The present invention relates to heating furnace, particularly the combustion control system of industry heating stove and control method.
Background technology
Heating furnace is the major power consumer of steel rolling mill, in producing, steel rolling occupies very consequence again simultaneously, the plasticity, the reduction resistance of deformation that are mainly used in improving steel, be heated to steel according to the rolling rhythm of milling train temperature levels and the heating quality of technological requirement.Guaranteeing, under the prerequisite of fine quality production, need to reduce as much as possible fuel consumption, reduce oxidization burning loss.
Air consumption coefficient in heating furnace is in best combustion region time, and the utilization of the fuel system thermal efficiency is the highest.Air consumption coefficient is lower than lower limit (minimum of a value), and fuel combustion is insufficient, causes waste of fuel; Air consumption coefficient is greater than the upper limit (maximum), in flue gas after burning, remain the oxygen (air is brought into) of large concentration, amount of oxidation loss is increased, oxygen concentration is higher, the oxidization burning loss of steel billet is larger, and too much flue gas is taken away a large amount of heats, make the combustion system thermal efficiency too low.Therefore, the atmosphere in heating-furnace is controlled and is seemed extremely important, and the quality that atmosphere is controlled directly affects the lumber recovery of fuel ton consumption and steel.
At present, heater control system mainly be take heating-up temperature as controlling target, Atmosphere Control mode is mainly: Artificial Control enters air mass flow and the gas flow in stove, be Artificial Control setting air consumption coefficient or air-fuel ratio (air consumption coefficient and air-fuel ratio can convert by set formula), thereby reach the object of controlling furnace atmosphere.The specific embodiment is: set fixing air consumption coefficient or air-fuel ratio, change gas flow (air consumption coefficient is constant) and make heating-up temperature in stove meet thermal technology's requirement.
The subject matter that above-mentioned reheat furnace system control method exists:
1, because heated furnace volume is large, thermotonus lags behind large, and temperature regulates slowly;
2, the artificial air-fuel ratio of setting often with stove in actual mixing ratio inconsistent, error is larger.In stove, fired state is subject to the factors such as calorific value of gas fluctuation, Error of flowrate computation, valve opening error, Leakage Gas, flue gas velocity affect and depart from;
3, cannot obtain in real time, continuously each section of oxygen of heating furnace and carbonomonoxide concentration, cannot determine actual air consumption coefficient in each section of stove of heating furnace, cannot determine that whether each section of heating furnace be in optimal combustion state;
4, owing to cannot accurately knowing combustion case in heating furnace, only depend on artificial experience, actual air consumption coefficient is often larger, major part reach 1.4 and more than, increased fuel consumption, simultaneous oxidation burn out rate is higher, generally >=1.0%, high even surpasses 1.5%;
5, general temperature control and regulation amplitude range large (target temperature T ± 50 ℃), energy consumption is high;
6, cannot know residual fuel content in stove, tend to cause potential safety hazard, cause the explosion accident of the equipment such as subsequent technique pipeline, smoke exhaust fan, cause equipment property loss and personal security accident.
Therefore, how fast, detect accurately, reliably heating furnace atmosphere and in addition FEEDBACK CONTROL (each section of independent optimization of heating furnace controlled) be the field technical barrier in the urgent need to address such as metallurgical.
Summary of the invention
In order to solve the deficiency in above-mentioned prior art scheme, the invention provides a kind of combustion control system that detects quick, accurate, reliable and the industrial furnace that cost is low.
The object of the invention is to be achieved through the following technical solutions:
A combustion control system for industrial furnace, the combustion control system of described industrial furnace comprises:
Laser spectrum checkout gear, described laser spectrum checkout gear is for detection of the gas content in described industrial furnace; Described laser spectrum checkout gear comprises laser instrument, detector and analysis module;
Combustion control device, the combustion position in described industrial furnace is optimized, adjusted to described combustion control device for the data that send according to described laser spectrum checkout gear;
Oxidization burning loss checkout gear, described oxidization burning loss checkout gear is for detection of the oxidization burning loss of the workpiece through in described industrial furnace, and testing result is sent to comparison device;
Comparison device, described comparison device is for knowing comparison result, and be sent to calculation element according to the described testing result, the original oxidization burning loss situation that receive;
Calculation element, described calculation element is controlled effect for obtain the burning of described industrial furnace according to the running time of described control system, the described comparison result that receives.
According to above-mentioned combustion control system, preferably, on the optical path forming at described laser spectrum checkout gear, on unit light path, in industrial furnace, the gas of central area is strong to the absorptance fringe region of measurement light.
According to above-mentioned combustion control system, preferably, the top 10-50cm of the burner in described industrial furnace of the light path for detection of gas content that described laser spectrum checkout gear forms, or between heated parts and burner.
According to above-mentioned combustion control system, alternatively, described laser spectrum checkout gear is arranged at least one section in preheating section, bringing-up section and soaking zone.
According to above-mentioned combustion control system, alternatively, described laser spectrum checkout gear is also for detection of the temperature in described industrial furnace.
According to above-mentioned combustion control system, alternatively, described combustion control device further comprises:
The first comparing module, the temperature measured value that described the first comparing module sends for comparing desired temperature, described analysis module, comparison situation is sent to the first control module;
The first control module, described the first control module is for controlling fuel and the oxygen flow leading in described industrial furnace according to described comparison situation:
If observed temperature value, higher than setting value, reduces fuel flow rate and/or oxygen flow;
If observed temperature value, lower than setting value, improves fuel flow rate and/or oxygen flow.
According to above-mentioned combustion control system, alternatively, described combustion control device further comprises:
The second comparing module, described the second comparing module is for comparing the content measured value in content setting value, described industrial furnace, and comparison situation is sent to the second control module;
The second control module, described the second control module is for controlling fuel or the oxygen flow leading in described industrial furnace according to described comparison situation:
If fuel gas content measured value, higher than setting value, improves oxygen flow;
If oxygen content measured value, higher than setting value, reduces oxygen flow.
According to above-mentioned combustion control system, preferably, the top 2-20cm of the workpiece in industrial furnace of the light path for detection of temperature that described laser spectrum checkout gear forms.
According to above-mentioned combustion control system, preferably, described laser spectrum checkout gear is at least 1.5m to the distance that enters steel side of described industrial furnace preheating section of kiln.
According to above-mentioned combustion control system, preferably, described laser spectrum checkout gear is at least 1m to the distance of the tapping side of the soaking zone of described industrial furnace.
The present invention also provide a kind of accurately, fast, the method for controlling combustion of industrial furnace cheaply.This goal of the invention is achieved through the following technical solutions:
A method for controlling combustion for industrial furnace, the method for controlling combustion of described industrial furnace comprises the following steps:
(A1) laser spectrum checkout gear is set on described industrial furnace, for detection of the gas content in described industrial furnace;
(A2) combustion position in described industrial furnace is optimized, adjusted to the data that send according to described laser spectrum checkout gear;
(A3) oxidization burning loss checkout gear detects the oxidization burning loss through the workpiece in described industrial furnace, and testing result is sent to comparison device;
(A4) comparison device is known comparison result, and is sent to calculation element according to the described testing result, the original oxidization burning loss situation that receive;
(A5) effect is controlled in the burning that calculation element obtains described industrial furnace according to running time, the described comparison result that receives.
According to the method for controlling combustion of above-mentioned industrial furnace, alternatively, described oxidization burning loss checkout gear adopts weight ratio surface area analogue method or iron scale weight method or steel billet weight method or thickness measuring method.
According to the method for controlling combustion of above-mentioned industrial furnace, preferably, the soaking zone of described industrial furnace and bringing-up section are reducing atmosphere.
According to the method for controlling combustion of above-mentioned industrial furnace, preferably, described industrial furnace preheating section of kiln is partly reducing atmosphere or partial oxygen voltinism atmosphere or neutral atmosphere.
According to the method for controlling combustion of above-mentioned industrial furnace, alternatively, described laser spectrum checkout gear is also for detection of the temperature in described industrial furnace.
According to the method for controlling combustion of above-mentioned industrial furnace, alternatively, (A2) is further comprising the steps for step:
(B1) the first comparing module is for comparing the temperature measured value in desired temperature, described industrial furnace, and comparison situation is sent to the first control module;
(B2) the first control module is controlled fuel and the oxygen flow leading in described industrial furnace according to described comparison situation:
If observed temperature value, higher than setting value, reduces fuel flow rate and/or oxygen flow, and turn back to step (B1);
If observed temperature value, lower than setting value, improves fuel flow rate and/or oxygen flow, and turn back to step (B1);
If observed temperature value equals setting value, enter next step.
According to the method for controlling combustion of above-mentioned industrial furnace, alternatively, (A2) is further comprising the steps for step:
(C1) the gas content measured value that the second comparing module comparison gas content setting value, described checkout gear send, comparison situation is sent to the second control module;
(C2) the second control module is controlled fuel or the oxygen flow leading in described industrial furnace according to described comparison situation:
If fuel content measured value, higher than setting value, improves oxygen flow, turn back to step (B1);
If oxygen content measured value, higher than setting value, reduces oxygen flow, turn back to step (B1);
If gas content measured value meets setting value, enter next step.
According to the method for controlling combustion of above-mentioned industrial furnace, alternatively, (A2) is further comprising the steps for step:
(D1) the oxygen content measured value that the 3rd comparing module comparison oxygen content setting value, described laser spectrum checkout gear send, comparison situation is sent to the 3rd control module;
(D2) amount of the oxygen of industrial furnace is transported in the 3rd control module adjustment, makes the oxygen content measured value in industrial furnace reach described setting value.
According to the method for controlling combustion of above-mentioned industrial furnace, alternatively, (A2) is further comprising the steps for step:
(D3) judge whether the fuel content measured value that described laser spectrum checkout gear sends exceeds standard:
If fuel content measured value exceeds standard, adjust oxygen content setting value, turn back to step (D1);
If fuel content measured value does not exceed standard, maintain current oxygen content setting value.
According to the method for controlling combustion of above-mentioned industrial furnace, preferably, on the optical path forming at described laser spectrum checkout gear, on unit light path, in industrial furnace, the gas of central area is strong to the absorptance fringe region of measurement light.
According to the method for controlling combustion of above-mentioned industrial furnace, alternatively, fuel and the oxygen flow of metering input industrial furnace, and be sent to described comparison device;
Described comparison device obtains the saving amount of fuel and oxygen, and is sent to described calculation element according to described fuel and oxygen flow, original consumption;
Described calculation element is controlled effect according to described saving amount, the burning that obtains industrial furnace running time.
According to the method for controlling combustion of above-mentioned industrial furnace, preferably, adjust independently respectively the combustion position in described industrial furnace preheating section of kiln, soaking zone, bringing-up section.
Compared with prior art, the beneficial effect that the present invention has is:
1, each section of independent optimization (preheating section, bringing-up section, soaking zone) air-fuel ratio: each section of atmosphere segmentation of heating furnace detects, and segmentation is controlled;
2, energy-saving effect is excellent: dynamically adjust fired state, make burning in optimum state, saved a large amount of fuel, reduced the amount of oxidation loss of workpiece in stove simultaneously, improved significantly the economic benefit of manufacturing enterprise, fuel use amount can save 2%～10%, and amount of oxidation loss can reduce by 10%～50%;
3, safe and reliable: monitor in real time fuel content, adjust in time oxygen and fuel (as coal gas) flow, after making to burn, in flue gas, fiery gas bulk concentration, in safe range, is avoided the generation of explosion accident.
The significant advantage of 4, laser spectral analysis technology, as:
A, detection accuracy are high: measurement category is the mean concentration of heating furnace burner hearth inside, atmosphere in reacting furnace exactly, and measured value can be used for burning optimization automatic linkage and controls;
B, possesses optimal combustion state optimizing function: according to the O detecting
2with (as CO) content of fuel, can realize fired state and dynamically adjust, and definite optimal combustion state;
C, fast response time: response time < 1S.
Accompanying drawing explanation
With reference to accompanying drawing, disclosure of the present invention will be easier to understand.Those skilled in the art hold intelligible: these accompanying drawings are only for illustrating technical scheme of the present invention, and are not intended to protection scope of the present invention to be construed as limiting.In figure:
Fig. 1 is according to the structure diagram of the control system of the industrial furnace of the embodiment of the present invention 1;
Fig. 2 is according to the structure diagram of the combustion control device of the embodiment of the present invention 1;
Fig. 3 is according to the flow chart of the method for controlling combustion of the industrial furnace of the embodiment of the present invention 1;
Fig. 4 installs sketch according to the horizontal direction of the laser spectrum checkout gear of the embodiment of the present invention 2;
Fig. 5 installs sketch according to the vertical direction of the laser spectrum checkout gear of the embodiment of the present invention 2.
The specific embodiment
Fig. 1-5 and following declarative description optional embodiment of the present invention to instruct those skilled in the art how to implement and to reproduce the present invention.In order to instruct technical solution of the present invention, simplified or omitted some conventional aspects.Those skilled in the art should understand that be derived from the modification of these embodiments or replace will be within the scope of the invention.Those skilled in the art should understand that following characteristics can combine to form a plurality of modification of the present invention in every way.Thus, the present invention is not limited to following optional embodiment, and only by claim and their equivalent, is limited.
Embodiment 1:
Fig. 1 has schematically provided the structure diagram of combustion control system of the industrial furnace of the embodiment of the present invention, and as shown in Figure 1, the combustion control system of described industrial furnace comprises:
Laser spectrum checkout gear, described laser spectrum checkout gear is arranged on described industrial furnace, for detection of the gas content in described industrial furnace, as the content of oxygen, carbon monoxide; Described laser spectrum checkout gear comprises laser instrument, detector and analysis module.Described laser instrument can be arranged on respectively with detector the both sides that industrial furnace is relative, makes optical path pass the gas in industrial furnace; Can also make laser instrument and detector be arranged on a side, light-reflecting components is arranged on relative opposite side, makes to measure the gas that light passes in industrial furnace for twice.
Combustion control device, the combustion position in described industrial furnace is optimized, adjusted to described combustion control device for the data that send according to described laser spectrum checkout gear; Particularly, the parameter of the gas contents such as the oxygen that described laser spectrum checkout gear records, carbon monoxide has reflected the combustion position in industrial furnace, control device removes to adjust the flow of the gases such as oxygen in input industrial furnace, carbon monoxide according to the combustion position of actual measurement, or the amount of other types fuel, as oil product, thereby make burning in described each section of industrial furnace in optimum state, on the one hand reduce Fuel Consumption, also reduced on the other hand the oxidization burning loss of the heated parts that too much oxygen brings.
Oxidization burning loss checkout gear, described oxidization burning loss checkout gear is for detection of the oxidization burning loss of the workpiece through in described industrial furnace, and testing result is sent to comparison device; Oxidization burning loss checkout gear is the state of the art, does not repeat them here.
Comparison device, described comparison device is for knowing comparison result, and be sent to calculation element according to the described testing result, the original oxidization burning loss situation that receive; This compare device can realize by software or circuit.
Calculation element, described calculation element is controlled effect for obtain the burning of described industrial furnace according to the running time of described control system, the described comparison result that receives, also adopt burning to control the reduction of rear oxidation scaling loss, this reduction can be converted to the economic benefit of control system owner unit, and the supplier of control system can from described economic benefit, extract a part using as income.
In order more effectively to detect gas content or the temperature of central area in industrial furnace, to overcome the inherent defect of zirconia sensor, preferably, on the optical path forming at described laser spectrum checkout gear, on unit light path, in industrial furnace, the gas of central area (temperature is high) is strong to the absorptance fringe region (temperature is low) of measurement light, and the absorption of fringe region can be ignored.
In order truly to reflect combustion position in industrial furnace and for FEEDBACK CONTROL, preferably, the top 10-50cm of the burner in described industrial furnace of the light path for detection of gas content that described laser spectrum checkout gear forms, this region is flame combustion region, or between heated parts and burner, to detect exactly near combustion atmosphere workpiece.
In order to record accurately, fast, at low cost the ignition temperature in industrial furnace, alternatively, described laser spectrum checkout gear is also for detection of the temperature in described industrial furnace, and concrete metering system is the state of the art, does not repeat them here.
Fig. 2 has schematically provided the structure diagram of the combustion control device of the embodiment of the present invention, and as shown in Figure 2, described combustion control device further comprises:
The first comparing module (circuit or software), described the first comparing module is for the temperature measured value in comparison (burning when optimum state in industrial furnace) desired temperature, described industrial furnace, and comparison situation is sent to the first control module;
The first control module (circuit or software), described the first control module is for controlling fuel and the oxygen flow leading in described industrial furnace according to described comparison situation:
If observed temperature value higher than setting value, reduces fuel (as gaseous state, liquid state, solid fuels such as carbon monoxide, oil, coals) flow and oxygen flow, as regulated gas flow control device, as butterfly valve;
If observed temperature value, lower than setting value, improves fuel flow rate and oxygen flow, as increased the aperture of valve on fuel channel.
According to above-mentioned control system, alternatively, described combustion control device further comprises:
The second comparing module (circuit or software), the gas content measured value that described the second comparing module is sent here for comparison (burning when optimum state in industrial furnace) gas content setting value, described laser spectrum checkout gear, comparison situation is sent to the second control module;
The second control module (circuit or software), described the second control module is for controlling fuel or the oxygen flow leading in described industrial furnace according to described comparison situation:
If fuel content measured value, higher than setting value, improves oxygen flow, as regulated the valve of controlling air mass flow;
If oxygen content measured value, higher than setting value, reduces oxygen flow.
In order effectively to record the temperature in industrial furnace, preferably, the top 2-20cm of the workpiece in industrial furnace of the light path for detection of temperature that described laser spectrum checkout gear forms.
In order to obtain further burning, control effect, the flow of flowmeter metering fuel and oxygen, and be sent to described comparison device, comparison device obtains and compares saved fuel and gas flow with existing control mode, and be sent to calculation element, calculation element is according to fuel and the gas flow saved, the reduction of oxidization burning loss, running time and calculating due to the economic benefit that adopts above-mentioned combustion control system and method to obtain, combustion control system supplier from described economic benefit Extraction parts as income, withdrawal ratio is by owner unit, supplier arranges by prior reducing energy consumption agreement.
In order to avoid into the steel mouth influence area of leaking out, preferably, described laser spectrum checkout gear is at least 1.5m to the distance that enters steel side of described industrial furnace preheating section of kiln.
In order to avoid the tapping hole influence area of leaking out, preferably, described laser spectrum checkout gear is at least 1m to the distance of the tapping side of the soaking zone of described industrial furnace.
Fig. 3 has schematically provided a kind of method for controlling combustion of industrial furnace, is also the method for work of the combustion control system of above-mentioned industrial furnace, and as shown in Figure 3, the method for controlling combustion of described industrial furnace comprises the following steps:
(A1) laser spectrum checkout gear is set on described industrial furnace, for detection of the gas content in described industrial furnace;
(A2) combustion position in described industrial furnace is optimized, adjusted to the data that send according to described laser spectrum checkout gear;
(A3) oxidization burning loss checkout gear detects the oxidization burning loss through the workpiece in described industrial furnace, and testing result is sent to comparison device;
(A4) comparison device is known comparison result, and is sent to calculation element according to the described testing result, the original oxidization burning loss situation that receive;
(A5) effect is controlled in the burning that calculation element obtains described industrial furnace according to running time, the described comparison result that receives.
Alternatively, described oxidization burning loss checkout gear adopts weight ratio surface area analogue method or iron scale weight method or steel billet weight method or thickness measuring method.These detection methods are all prior aries, do not repeat them here.
In order to make burning in industrial furnace in optimum state, preferably, the soaking zone of described industrial furnace and bringing-up section are reducing atmosphere, and further, described industrial furnace preheating section of kiln is partly reducing atmosphere or partial oxygen voltinism atmosphere or neutral atmosphere.
In order effectively to record the temperature in industrial furnace, alternatively, described laser spectrum checkout gear is also for detection of the temperature in described industrial furnace.
For the combustion position in accurate, quick feedback control industrial furnace, so that burning is in optimum state, alternatively, (A2) is further comprising the steps for step:
(B1) the first comparing module (software or circuit) is for the temperature measured value in comparison (in industrial furnace burning when the optimum state) desired temperature, described industrial furnace, and comparison situation is sent to the first control module;
(B2) the first control module (software or circuit) is controlled fuel and/or the oxygen flow leading in described industrial furnace according to described comparison situation:
If observed temperature value, higher than setting value, reduces fuel flow rate and/or oxygen flow, and turn back to step (B1);
If observed temperature value, lower than setting value, improves fuel flow rate and/or oxygen flow, and turn back to step (B1);
If observed temperature value equals setting value, enter next step.
In order to optimize better the burning in industrial furnace, alternatively, (A2) is further comprising the steps for step:
(C1) the content measured value that the second comparing module (software or circuit) comparison (burning when optimum state in industrial furnace) gas content setting value, described laser spectrum checkout gear send, comparison situation is sent to the second control module;
(C2) the second control module (software or circuit) is controlled fuel or the oxygen flow leading in described industrial furnace according to described comparison situation:
If fuel content measured value, higher than setting value, improves oxygen flow, turn back to step (B1);
If oxygen content measured value, higher than setting value, reduces oxygen flow, turn back to step (B1);
If gas content meets setting value, enter next step.
According to the method for controlling combustion of above-mentioned industrial furnace, alternatively, (A2) is further comprising the steps for step:
(D1) the oxygen content measured value that the 3rd comparing module comparison oxygen content setting value, described laser spectrum checkout gear send, comparison situation is sent to the 3rd control module;
(D2) amount of the oxygen of industrial furnace is transported in the 3rd control module adjustment, makes the oxygen content measured value in industrial furnace reach described setting value.
According to the method for controlling combustion of above-mentioned industrial furnace, alternatively, (A2) is further comprising the steps for step:
(D3) judge whether the fuel content measured value that described laser spectrum checkout gear sends exceeds standard:
If fuel content measured value exceeds standard, adjust oxygen content setting value, turn back to step (D1);
If fuel content measured value does not exceed standard, maintain current oxygen content setting value.
For metering combustion is better controlled effect, alternatively, in above-mentioned control procedure, the flow of flowmeter metering fuel and air input heating furnace, and be sent to comparison device (have and heat the gas flow that same workpiece consumes in the past), thereby obtain and compare saved fuel and gas flow with existing control mode, and be sent to calculation element, calculation element is according to fuel and the gas flow saved, the reduction of oxidization burning loss, running time and calculating due to the economic benefit that adopts above-mentioned combustion control system and method to obtain, combustion control system supplier from described economic benefit Extraction parts as income, withdrawal ratio is by owner unit, supplier arranges by prior reducing energy consumption agreement.
In order further to strengthen the burning of industrial furnace, control effect, control independently respectively the combustion position of bringing-up section, preheating section, soaking zone in industrial furnace.
The benefit reaching according to the control system of the industrial furnace of the embodiment of the present invention 1 and control method is: the gas content that the laser spectrum checkout gear of employing records, temperature have reflected the combustion position in industrial furnace accurately and rapidly, and the introducing of control mode makes burning in industrial furnace in the best, make fuel and gas consumption in optimum state, the oxidization burning loss of heated parts is also in reduced levels, greatly improve the economic benefit of owner unit, and then improved supplier's income.
Embodiment 2:
The application examples in heater for rolling steel according to the combustion control system of the industrial furnace of the embodiment of the present invention 1 and control method.
Fig. 4,5 has provided respectively level, the vertical direction of laser spectrum checkout gear that should use-case sketch has been installed, as shown in Figure 4,5, heating furnace is divided into preheating section, bringing-up section and soaking zone, the installation site of laser spectrum checkout gear is specially: in height, and in each section of top burner top 10～50cm; On this height and position, installation, easy to maintenance, and light path is good; In the horizontal direction, preheating section: avoid into the steel mouth influence area (distance enter steel side 2.2m) of leaking out, two burner centers of the section of getting center deflection bringing-up section; Bringing-up section: the section of getting center; Soaking zone: avoid the tapping hole influence area (distance tapping side 2m) of leaking out, two burner centers of the section of getting center deflection bringing-up section.The gas recording (oxygen and carbon monoxide) concentration is the mean concentration of heating furnace width, measuring light path is heating-furnace insied width, width is general >=and 6 meters, the irregular amplitude fluctuation of concentration in the several partial points of furnace wall annex region is on almost not impact of component mean concentration in stove, mean concentration can truly reflect furnace atmosphere environment, and measured value can be used for automatic linkage and controls.
In the course of work of above-mentioned control system:
The former DCS/PLC of the owner unit of control system sets heating target temperature and heating target temperature bound according to steel billet kind, default air-fuel ratio, and laser combustion control system (FOCS) is set oxygen and carbonomonoxide concentration bound.
It is 0.9～1.0 that soaking zone air consumption coefficient is set; Bringing-up section air consumption coefficient is 0.95～1.05; Preheating section air consumption coefficient is 1.05～1.15; Soaking zone and bringing-up section are weak reducing atmosphere (having fuel residue), under high-temperature low-oxygen, can significantly reduce the amount of oxidation loss of steel billet; Preheating section is weak oxide atmosphere (aerobic residue), and the remaining fuel of soaking zone and bringing-up section mixes fully burning with the remaining oxygen of preheating section at preheating section, and assurance fuel is not wasted.
Concrete combustion control mode is:
(B1) temperature value in the industrial furnace that the first comparing module comparison desired temperature, usual manner record, comparison result is sent to the first control module;
(B2) the first control module is according to the combustion position in each section of comparison result FEEDBACK CONTROL heating furnace:
If meeting to set, 1 observed temperature requires: the uncomfortable throughput of economizing on coal of the former DCS/PLC system of owner unit, and laser spectrum checkout gear is sent to the second comparing module by the oxygen recording and carbonomonoxide concentration;
The gas concentration value of the second comparing module comparison concentration set point, actual measurement, result is sent to the second control module;
The gas flow of the second control module according to the result that receives and in each section of FEEDBACK CONTROL input heating furnace:
If oxygen concentration surpasses capping, reduce air mass flow, make oxygen content lower than the setting value upper limit, and turn back to step (B1);
If carbon monoxide content surpasses capping, increase air mass flow, make carbon monoxide content lower than the setting value upper limit, and turn back to step (B1);
If gas concentration value meets setting value, enter next step.
If rising, 2 observed temperatures surpass capping: the former DCS/PLC system of owner unit reduces gas flow, and FOCS system keeps track gas flow regulates and reduces air mass flow (air-fuel ratio is preset value), and turns back to step (B1).
3, observed temperature declines over setting lower limit: the former DCS/PLC system of owner unit increases gas flow, (air-fuel ratio is preset value to FOCS system keeps track gas flow set point adjustment air mass flow, in system, set interlock, air first regulates), and turn back to step (B1).
Above-mentioned control mode can independently be carried out in each section of heating furnace.
Adopt butterfly valve to control respectively the flow of coal gas and air, input connects the first control module and the second control module, adopts flowmeter to measure respectively the flow of coal gas and air, and output connects comparison device.Comparison device obtains and compares with existing control mode, the saving amount of coal gas and air, calculation element obtains and adopts the economic benefit of bringing after this combustion control system and method according to described saving amount, oxidization burning loss reduction, and according to owner unit and control system supplier, sign in advance energy-conservationly share the income that agreement show that supplier should obtain.
Embodiment 3:
The application examples in heater for rolling steel according to the combustion control system of the industrial furnace of the embodiment of the present invention 1 and control method.
In this application examples, heating furnace is divided into preheating section, bringing-up section and soaking zone, and the installation site of first set laser spectrum checkout gear is specially: in height, and between each section of burner and workpiece; On this height and position, installation, easy to maintenance, and light path is good, detects preferably the combustion atmosphere of workpiece annex; In the horizontal direction, preheating section: avoid into the steel mouth influence area (distance enter steel side 2m) of leaking out, two burner centers of the section of getting center deflection bringing-up section; Bringing-up section: the section of getting center; Soaking zone: avoid the tapping hole influence area (distance tapping side 1.8m) of leaking out, two burner centers of the section of getting center deflection bringing-up section.The gas recording (oxygen and carbon monoxide) concentration is the mean concentration of heating furnace width, measuring light path is heating-furnace insied width, width is general >=and 6 meters, the irregular amplitude fluctuation of concentration in the several partial points of furnace wall annex region is on almost not impact of component mean concentration in stove, mean concentration can truly reflect furnace atmosphere environment, and measured value can be used for automatic linkage and controls.
The top 2-20cm of the workpiece in industrial furnace of the light path for detection of temperature that the second cover laser spectrum checkout gear forms.
In the course of work of above-mentioned control system:
The former DCS/PLC of owner unit sets heating target temperature and heating target temperature bound according to steel billet kind, and default air-fuel ratio is set, and laser combustion control system (FOCS) is set oxygen and carbonomonoxide concentration bound.
It is 0.9～1.0 that soaking zone air consumption coefficient is set; Bringing-up section air consumption coefficient is 0.95～1.05; Preheating section air consumption coefficient is 1.05～1.15; Soaking zone and bringing-up section are weak reducing atmosphere (having fuel residue), under high-temperature low-oxygen, can significantly reduce the amount of oxidation loss of steel billet; Preheating section is weak oxide atmosphere (aerobic residue), and the remaining fuel of soaking zone and bringing-up section mixes fully burning with the remaining oxygen of preheating section at preheating section, and assurance fuel is not wasted.
Concrete combustion control mode is:
(B1) temperature value that the first comparing module comparison desired temperature, laser spectrum checkout gear record, comparison result is sent to the first control module;
(B2) the first control module is according to the combustion position in each section of comparison result FEEDBACK CONTROL heating furnace:
If meeting to set, 1 observed temperature requires: the uncomfortable throughput of economizing on coal of FOCS system, and laser spectrum checkout gear is sent to the second comparing module by the oxygen recording and carbonomonoxide concentration;
The gas concentration value of the second comparing module comparison concentration set point, actual measurement, result is sent to the second control module;
The gas flow of the second control module according to the result that receives and in each section of FEEDBACK CONTROL input heating furnace:
If oxygen concentration surpasses capping, reduce air mass flow, make oxygen content lower than the setting value upper limit, and turn back to step (B1);
If carbon monoxide content surpasses capping, increase air mass flow, make carbon monoxide content lower than the setting value upper limit, and turn back to step (B1);
If gas concentration value meets setting value, enter next step.
If rising, 2 observed temperatures surpass capping: FOCS system reduces coal gas and oxygen flow (air-fuel ratio is preset value) automatically, and turns back to step (B1).
3, observed temperature declines over setting lower limit: FOCS system increases coal gas and oxygen flow (air-fuel ratio is preset value, sets interlock in system, first increases oxygen flow, then increases gas flow) automatically, and turns back to step (B1).
Above-mentioned control mode is independently carried out in each section of heating furnace.
Adopt butterfly valve to control respectively the flow of coal gas and air, input connects the first control module and the second control module, adopts flowmeter to measure respectively the flow of coal gas and air, and output connects comparison device.Comparison device obtains and compares with existing control mode, the saving amount of coal gas and air, calculation element obtains and adopts the economic benefit of bringing after this combustion control system and method according to described saving amount, oxidization burning loss reduction, and according to owner unit and control system supplier, sign in advance energy-conservationly share the income that agreement show that supplier should obtain.
Field experiment result shows: by above-mentioned burning, control, can realize the accurate control of each section of atmosphere in heating furnace, air consumption coefficient is controlled in rational scope, thermal efficiency utilization is greatly improved, heating-up temperature fluctuation amplitude significantly reduces simultaneously, has reduced the fuel ton consumption of steel billet.
Embodiment 4:
The application examples in heater for rolling steel according to the combustion control system of the industrial furnace of the embodiment of the present invention 1 and control method.
In this application examples, heating furnace is divided into preheating section, bringing-up section and soaking zone, and the installation site of laser spectrum checkout gear is specially: in height, and in the top of each section of burner 10-50cm; On this height and position, installation, easy to maintenance, and light path is good; In the horizontal direction, preheating section: avoid into the steel mouth influence area (distance enter steel side be 1.8m) of leaking out, two burner centers of the section of getting center deflection bringing-up section; Bringing-up section: the section of getting center; Soaking zone: avoid the tapping hole influence area (distance tapping side 1.2m) of leaking out, two burner centers of the section of getting center deflection bringing-up section.The gas recording (oxygen and carbon monoxide) concentration is the mean concentration of heating furnace width, measuring light path is heating-furnace insied width, width is general >=and 6 meters, the irregular amplitude fluctuation of concentration in the several partial points of furnace wall annex region is on almost not impact of component mean concentration in stove, mean concentration can truly reflect furnace atmosphere environment, and measured value can be used for automatic linkage and controls.
In the course of work of above-mentioned control system: laser combustion control system (FOCS) is set target oxygen concentration, coal gas aimed concn is interval.
Concrete combustion control mode is:
(D1) the oxygen concentration measured value that the 3rd comparing module comparison target oxygen concentration, described laser spectrum checkout gear send, comparison situation is sent to the 3rd control module;
(D2) amount of the air of industrial furnace is transported in the 3rd control module adjustment, makes the oxygen concentration measured value in industrial furnace reach described target oxygen concentration;
As:
Actual measurement oxygen concentration 3%, target oxygen concentration 2%, reduces air mass flow, makes to survey oxygen concentration and is adjusted to 2%;
Actual measurement oxygen concentration 1%, target oxygen concentration 2%, increases air mass flow, makes to survey oxygen concentration and is adjusted to 2%;
Above-mentioned adjustment also can complete by increment PI D regulative mode.
(D3) judge whether the gas concentration measured value that described laser spectrum checkout gear sends exceeds standard:
If gas concentration measured value exceeds standard, adjust target oxygen concentration, turn back to step (D1);
If gas concentration measured value does not exceed standard, maintain current target oxygen concentration.
As:
Actual measurement coal gas (CO) concentration 5000ppm, coal gas aimed concn 3000ppm, target oxygen concentration 2%, target oxygen concentration is adjusted into 2.2%, and turns back to step (D1);
Actual measurement coal gas (CO) concentration 1500ppm, coal gas aimed concn 3000ppm, target oxygen concentration 2%, target oxygen concentration is constant, and turns back to step (D1);
Above-mentioned control mode is independently carried out in each section of heating furnace.
Adopt butterfly valve to control respectively the flow of coal gas and air, input connects the first control module and the second control module, adopts flowmeter to measure respectively the flow of coal gas and air, and output connects comparison device.Comparison device obtains and compares with existing control mode, the saving amount of coal gas and air, calculation element obtains and adopts the economic benefit of bringing after this combustion control system and method according to described saving amount, oxidization burning loss reduction, and according to owner unit and control system supplier, sign in advance energy-conservationly share the income that agreement show that supplier should obtain.
Field experiment result shows: by above-mentioned burning, control, can realize the accurate control of each section of atmosphere in heating furnace, air consumption coefficient is controlled in rational scope, thermal efficiency utilization is greatly improved, heating-up temperature fluctuation amplitude significantly reduces simultaneously, has reduced the fuel ton consumption of steel billet.
Embodiment 5:
The application examples in heater for rolling steel according to the combustion control system of the industrial furnace of the embodiment of the present invention 1 and control method.
In this application examples, heating furnace is divided into preheating section, bringing-up section and soaking zone, and the installation site of laser spectrum checkout gear is specially: in height, and between each section of burner and workpiece; On this height and position, installation, easy to maintenance, and light path is good; In the horizontal direction, preheating section: avoid into the steel mouth influence area (distance enter steel side 1.5m) of leaking out, two burner centers of the section of getting center deflection bringing-up section; Bringing-up section: the section of getting center; Soaking zone: avoid the tapping hole influence area (distance tapping side 1m) of leaking out, two burner centers of the section of getting center deflection bringing-up section.The gas recording (oxygen and carbon monoxide) concentration is the mean concentration of heating furnace width, measuring light path is heating-furnace insied width, width is general >=and 6 meters, the irregular amplitude fluctuation of concentration in the several partial points of furnace wall annex region is on almost not impact of component mean concentration in stove, mean concentration can truly reflect furnace atmosphere environment, and measured value can be used for automatic linkage and controls.
In the course of work of above-mentioned control system:
Laser combustion control system (FOCS) is set target oxygen concentration, target temperature, coal gas aimed concn interval.
Concrete combustion control mode is:
(B1) temperature value that the first comparing module comparison target temperature, traditional mode record, comparison result is sent to the first control module;
(B2) the first control module is according to the combustion position in each section of comparison result FEEDBACK CONTROL heating furnace:
The amount of the coal gas of industrial furnace is transported in adjustment, makes the temperature in industrial furnace reach described target temperature;
(D1) the oxygen concentration measured value that the 3rd comparing module comparison target oxygen concentration, described laser spectrum checkout gear send, comparison situation is sent to the 3rd control module;
(D2) amount of the air of industrial furnace is transported in the 3rd control module adjustment, makes the oxygen concentration measured value in industrial furnace reach described target oxygen concentration;
As:
Actual measurement oxygen concentration 3%, target oxygen concentration 2%, reduces air mass flow, makes to survey oxygen concentration and is adjusted to 2%;
Actual measurement oxygen concentration 1%, target oxygen concentration 2%, increases air mass flow, makes to survey oxygen concentration and is adjusted to 2%;
Above-mentioned adjustment can complete by increment PI D regulative mode.
(D3) judge whether the gas concentration measured value that described laser spectrum checkout gear sends exceeds standard:
If fuel concentration measured value exceeds standard, adjust target oxygen concentration, turn back to step (D1);
If fuel concentration measured value does not exceed standard, maintain current target oxygen concentration.
As:
Actual measurement coal gas (CO) concentration 5000ppm, coal gas aimed concn 3000ppm, target oxygen concentration 2%, target oxygen concentration is adjusted into 2.2%, and turns back to step (D1);
Actual measurement coal gas (CO) concentration 1500ppm, coal gas aimed concn 3000ppm, target oxygen concentration 2%, target oxygen concentration is constant, and turns back to step (D1);
Above-mentioned control mode is independently carried out in each section of heating furnace.
Adopt butterfly valve to control respectively the flow of coal gas and air, input connects the first control module and the second control module, adopts flowmeter to measure respectively the flow of coal gas and air, and output connects comparison device.Comparison device obtains and compares with existing control mode, the saving amount of coal gas and air, calculation element obtains and adopts the economic benefit of bringing after this combustion control system and method according to described saving amount, oxidization burning loss reduction, and according to owner unit and control system supplier, sign in advance energy-conservationly share the income that agreement show that supplier should obtain.
Field experiment result shows: by above-mentioned burning, control, can realize the accurate control of each section of atmosphere in heating furnace, air consumption coefficient is controlled in rational scope, thermal efficiency utilization is greatly improved, heating-up temperature fluctuation amplitude significantly reduces simultaneously, has reduced the fuel ton consumption of steel billet.
Claims (20)
1. a combustion control system for industrial furnace, the combustion control system of described industrial furnace comprises:
Laser spectrum checkout gear, described laser spectrum checkout gear is for detection of the gas content in described industrial furnace; Described laser spectrum checkout gear comprises laser instrument, detector and analysis module;
Combustion control device, the combustion position in described industrial furnace is optimized, adjusted to described combustion control device for the data that send according to described laser spectrum checkout gear;
Oxidization burning loss checkout gear, described oxidization burning loss checkout gear is for detection of the oxidization burning loss of the workpiece through in described industrial furnace, and testing result is sent to comparison device;
Comparison device, described comparison device is for knowing comparison result, and be sent to calculation element according to the described testing result, the original oxidization burning loss situation that receive;
Calculation element, described calculation element is controlled effect for obtain the burning of described industrial furnace according to the running time of described control system, the described comparison result that receives.
2. combustion control system according to claim 1, is characterized in that: the top 10-50cm of the burner in described industrial furnace of the light path for detection of gas content that described laser spectrum checkout gear forms, or between heated parts and burner.
3. combustion control system according to claim 1, is characterized in that: described laser spectrum checkout gear is also for detection of the temperature in described industrial furnace.
4. combustion control system according to claim 1, is characterized in that: described combustion control device further comprises:
The first comparing module, described the first comparing module is for comparing the temperature measured value in desired temperature, industrial furnace, and comparison situation is sent to the first control module;
The first control module, described the first control module is for controlling fuel and the oxygen flow leading in described industrial furnace according to described comparison situation:
If observed temperature value, higher than setting value, reduces fuel or/and oxygen flow;
If observed temperature value, lower than setting value, improves fuel or/and oxygen flow.
5. combustion control system according to claim 1, is characterized in that: described combustion control device further comprises:
The second comparing module, described the second comparing module is for comparing the content measured value that content sets value, described laser spectrum checkout gear sends, and comparison situation is sent to the second control module;
The second control module, described the second control module is for controlling fuel or the oxygen flow leading in described industrial furnace according to described comparison situation:
If fuel content measured value, higher than setting value, improves oxygen flow; Or,
If oxygen content measured value, higher than setting value, reduces oxygen flow.
6. according to the combustion control system described in claim 1 or 3, it is characterized in that: on the optical path forming at described laser spectrum checkout gear, on unit light path, in industrial furnace, the gas of central area is strong to the absorptance fringe region of measurement light.
7. combustion control system according to claim 3, is characterized in that: the top 2-20cm of the workpiece in industrial furnace of the light path for detection of temperature that described laser spectrum checkout gear forms.
8. combustion control system according to claim 1, is characterized in that: described laser spectrum checkout gear is at least 1.5m to the distance that enters steel side of described industrial furnace preheating section of kiln.
9. combustion control system according to claim 1, is characterized in that: described laser spectrum checkout gear is at least 1m to the distance of the tapping side of the soaking zone of described industrial furnace.
10. a method for controlling combustion for industrial furnace, the method for controlling combustion of described industrial furnace comprises the following steps:
(A1) laser spectrum checkout gear is set on described industrial furnace, for detection of the gas content in described industrial furnace;
(A2) combustion position in described industrial furnace is optimized, adjusted to the data that send according to described laser spectrum checkout gear;
(A3) oxidization burning loss checkout gear detects the oxidization burning loss through the workpiece in described industrial furnace, and testing result is sent to comparison device;
(A4) comparison device is known comparison result, and is sent to calculation element according to the described testing result, the original oxidization burning loss situation that receive;
(A5) effect is controlled in the burning that calculation element obtains described industrial furnace according to running time, the described comparison result that receives.
11. method for controlling combustion according to claim 10, is characterized in that: described oxidization burning loss checkout gear adopts weight ratio surface area analogue method or iron scale weight method or steel billet weight method or thickness measuring method.
12. method for controlling combustion according to claim 10, is characterized in that: the soaking zone of described industrial furnace and bringing-up section are reducing atmosphere.
13. method for controlling combustion according to claim 12, is characterized in that: described industrial furnace preheating section of kiln is partly reducing atmosphere or partial oxygen voltinism atmosphere or neutral atmosphere.
14. method for controlling combustion according to claim 10, is characterized in that: described laser spectrum checkout gear is also for detection of the temperature in described industrial furnace.
15. method for controlling combustion according to claim 10, is characterized in that: (A2) is further comprising the steps for step:
(B1) the first comparing module is for comparing the temperature measured value in desired temperature, described industrial furnace, and comparison situation is sent to the first control module;
(B2) the first control module is controlled fuel and the oxygen flow leading in described industrial furnace according to described comparison situation:
If observed temperature value, higher than setting value, reduces fuel flow rate and/or oxygen flow, and turn back to step (B1);
If observed temperature value, lower than setting value, improves fuel flow rate and/or oxygen flow, and turn back to step (B1);
If observed temperature value equals setting value, enter next step.
16. according to the method for controlling combustion described in claim 10 or 15, it is characterized in that: (A2) is further comprising the steps for step:
(C1) the gas content measured value that the second comparing module comparison gas content setting value, described laser spectrum checkout gear send, comparison situation is sent to the second control module;
(C2) the second control module is controlled fuel or the oxygen flow leading in described industrial furnace according to described comparison situation:
If fuel content measured value, higher than setting value, improves oxygen flow, turn back to step (B1);
If oxygen content measured value, higher than setting value, reduces oxygen flow, turn back to step (B1);
If gas content measured value meets setting value, enter next step.
17. according to the method for controlling combustion described in claim 10 or 15, it is characterized in that: (A2) is further comprising the steps for step:
(D1) the oxygen content measured value that the 3rd comparing module comparison oxygen content setting value, described laser spectrum checkout gear send, comparison situation is sent to the 3rd control module;
(D2) amount of the oxygen of industrial furnace is transported in the 3rd control module adjustment, makes the oxygen content measured value in industrial furnace reach described setting value.
18. method for controlling combustion according to claim 17, is characterized in that: (A2) is further comprising the steps for step:
(D3) judge whether the fuel content measured value that described laser spectrum checkout gear sends exceeds standard:
If fuel content measured value exceeds standard, adjust oxygen content setting value, turn back to step (D1);
If fuel content measured value does not exceed standard, maintain current oxygen content setting value.
19. method for controlling combustion according to claim 10, is characterized in that: fuel and the oxygen flow of metering input industrial furnace, and be sent to described comparison device;
Described comparison device obtains the saving amount of fuel and oxygen, and is sent to described calculation element according to described fuel and oxygen flow, original consumption;
Described calculation element is controlled effect according to described saving amount, the burning that obtains industrial furnace running time.
20. method for controlling combustion according to claim 10, is characterized in that: adjust independently respectively the combustion position in described industrial furnace preheating section of kiln, soaking zone, bringing-up section.
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