CN103672948B - The combustion control system of industrial furnace and control method - Google Patents

The combustion control system of industrial furnace and control method Download PDF

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Publication number
CN103672948B
CN103672948B CN201310712749.4A CN201310712749A CN103672948B CN 103672948 B CN103672948 B CN 103672948B CN 201310712749 A CN201310712749 A CN 201310712749A CN 103672948 B CN103672948 B CN 103672948B
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industrial furnace
combustion
comparison
checkout gear
fuel
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CN201310712749.4A
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CN103672948A (en
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顾海涛
施跃华
章瑜
徐瑞传
俞大海
高书成
王健
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聚光科技(杭州)股份有限公司
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Abstract

The invention provides a kind of combustion control system and control method of industrial furnace, described combustion control system comprises: laser spectrum checkout gear is for detecting the gas content in described industrial furnace; Laser spectrum checkout gear comprises laser instrument, detector and analysis module; Combustion control device is optimized for the data sent according to described laser spectrum checkout gear, the combustion position adjusted in described industrial furnace; Testing result for detecting the oxidization burning loss of the workpiece in described industrial furnace, and is sent to comparison device by oxidization burning loss checkout gear; Comparison device is used for according to the described testing result received, original oxidization burning loss situation and know comparison result, and is sent to calculation element; Calculation element is used for the Combustion System effect obtaining described industrial furnace according to the described comparison result received.The present invention has the advantages such as accuracy of detection is high, quick, cost is low, energy-conservation.

Description

The combustion control system of industrial furnace and control method
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 Rolling production, occupy very consequence again simultaneously, be mainly used in improving the plasticity of steel, reduce resistance of deformation, according to the rolling rhythm of milling train by heat steel to the temperature levels of technological requirement and heating quality.Under the prerequisite ensureing fine quality production, fuel consumption need be reduced as much as possible, reduce oxidization burning loss.
When the Air compress pump in heating furnace is in best combustion region, the fuel system thermal efficiency utilizes the highest.Air compress pump is lower than lower limit (minimum of a value), and fuel combustion is insufficient, causes waste of fuel; Air compress pump is greater than the upper limit (maximum), the oxygen (air is brought into) of large concentration is remained in flue gas after burning, amount of oxidation loss is increased, oxygen concentration is higher, the oxidization burning loss of steel billet is larger, and too much flue gas takes away a large amount of heats, make the combustion system thermal efficiency too low.Therefore, the control climate in heating-furnace seems extremely important, and the quality of control climate directly affects the lumber recovery of fuel ton consumption and steel.
At present, heater control system is mainly control objectives with heating-up temperature, Atmosphere Control mode is mainly: Artificial Control enters air mass flow in stove and gas flow, i.e. Artificial Control setting air consumption coefficient or air-fuel ratio (Air compress pump and air-fuel ratio convert by set formula), thus reach the object controlling furnace atmosphere.Detailed description of the invention is: the Air compress pump that setting is fixing or air-fuel ratio, change gas flow (Air compress pump 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 is greatly delayed, and temperature regulates slowly;
2, the air-fuel ratio of artificial setting is often inconsistent with actual mixing ratio in stove, and error is larger.Stove combustion state departs from by the factors such as calorific value of gas fluctuation, Error of flowrate computation, valve opening error, Leakage Gas, flue gas velocity affect;
3, heating furnace each section of oxygen and carbonomonoxide concentration cannot be obtained in real time, continuously, actual air consumption coefficient in heating furnace each section of stove cannot be determined, namely cannot determine whether each section of heating furnace is in optimal combustion state;
4, owing to accurately cannot know heating furnace combustion situation, only by artificial experience, actual air consumption coefficient is often larger, major part reach 1.4 and more than, add fuel consumption, simultaneous oxidation burn out rate is higher, generally >=1.0% is high even more than 1.5%;
5, general temperature control and regulation amplitude range large (target temperature T ± 50 DEG C), energy consumption is high;
6, residual fuel content in stove cannot be known, often 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, accurately, reliably detect heating furnace atmosphere and in addition FEEDBACK CONTROL (heating furnace each section of independent optimization controls) is the field such as metallurgical technical barrier in the urgent need to address.
Summary of the invention
In order to solve the deficiency in above-mentioned prior art, the invention provides a kind ofly to detect fast, accurately, the reliable and combustion control system of 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 detecting the gas content in described industrial furnace; Described laser spectrum checkout gear comprises laser instrument, detector and analysis module;
Combustion control device, described combustion control device is optimized for the data sent according to described laser spectrum checkout gear, the combustion position adjusted in described industrial furnace;
Oxidization burning loss checkout gear, testing result for detecting the oxidization burning loss of the workpiece in described industrial furnace, and is sent to comparison device by described oxidization burning loss checkout gear;
Comparison device, described comparison device is used for according to the described testing result received, original oxidization burning loss situation and know comparison result, and is sent to calculation element;
Calculation element, described calculation element is used for according to running time of described control system, the described comparison result that receives and obtain the Combustion System effect of described industrial furnace.
According to above-mentioned combustion control system, preferably, on the optical path that described laser spectrum checkout gear is formed, on unit light path, in industrial furnace, the gas of central area is strong to the absorptance fringe region measuring light.
According to above-mentioned combustion control system, preferably, the top 10-50cm being in burner in described industrial furnace for the light path detecting gas content that described laser spectrum checkout gear is formed, or between heated parts and burner.
According to above-mentioned combustion control system, alternatively, at least one section that described laser spectrum checkout gear is arranged 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 detecting the temperature in described industrial furnace.
According to above-mentioned combustion control system, alternatively, described combustion control device comprises further:
First comparing module, the temperature measured value that described first comparing module is used for comparison desired temperature, described analysis module sends, comparison situation is sent to the first control module;
First control module, described first control module is used for controlling according to described comparison situation to lead to the fuel in described industrial furnace and oxygen flow:
If observed temperature value is higher than setting value, then reduce fuel flow rate and/or oxygen flow;
If observed temperature value is lower than setting value, then improve fuel flow rate and/or oxygen flow.
According to above-mentioned combustion control system, alternatively, described combustion control device comprises further:
Second comparing module, described second comparing module is used for the content measured value in comparison content setting value, described industrial furnace, and comparison situation is sent to the second control module;
Second control module, described second control module is used for controlling according to described comparison situation to lead to the fuel in described industrial furnace or oxygen flow:
If fuel gas content measured value higher than setting value, then improves oxygen flow;
If oxygen content measured value higher than setting value, then reduces oxygen flow.
According to above-mentioned combustion control system, preferably, the light path for detected temperatures that described laser spectrum checkout gear is formed is in the top 2-20cm of workpiece in industrial furnace.
According to above-mentioned combustion control system, preferably, described laser spectrum checkout gear is at least 1.5m to the distance entering 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.
Present invention also offers a kind of accurately, fast, the method for controlling combustion of the industrial furnace of low cost.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 detecting the gas content in described industrial furnace;
(A2) data sent according to described laser spectrum checkout gear and optimize, the combustion position adjusted in described industrial furnace;
(A3) oxidization burning loss checkout gear detects the oxidization burning loss of the workpiece in described industrial furnace, and testing result is sent to comparison device;
(A4) comparison device is according to the described testing result received, original oxidization burning loss situation and know comparison result, and is sent to calculation element;
(A5) calculation element is according to running time, the described comparison result that receives and obtain the Combustion System effect of described industrial furnace.
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 oxidative 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 detecting the temperature in described industrial furnace.
According to the method for controlling combustion of above-mentioned industrial furnace, alternatively, step (A2) is further comprising the steps:
(B1) the first comparing module is used for the temperature measured value in comparison desired temperature, described industrial furnace, and comparison situation is sent to the first control module;
(B2) the first control module controls according to described comparison situation to lead to the fuel in described industrial furnace and oxygen flow:
If observed temperature value is higher than setting value, then reduces fuel flow rate and/or oxygen flow, and turn back to step (B1);
If observed temperature value is lower than setting value, then 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, step (A2) is further comprising the steps:
(C1) the gas content measured value that sends of the second comparison module gas content setting value, described checkout gear, comparison situation is sent to the second control module;
(C2) the second control module controls according to described comparison situation to lead to the fuel in described industrial furnace or oxygen flow:
If fuel content measured value higher than setting value, then improves oxygen flow, turn back to step (B1);
If oxygen content measured value higher than setting value, then 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, step (A2) is further comprising the steps:
(D1) the oxygen content measured value that sends of the 3rd comparison module oxygen content setting value, described laser spectrum checkout gear, 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, step (A2) is further comprising the steps:
(D3) judge whether the fuel content measured value that described laser spectrum checkout gear sends exceeds standard:
If fuel content measured value exceeds standard, then adjust oxygen content setting value, turn back to step (D1);
If fuel content measured value does not exceed standard, then maintain current oxygen content setting value.
According to the method for controlling combustion of above-mentioned industrial furnace, preferably, on the optical path that described laser spectrum checkout gear is formed, on unit light path, in industrial furnace, the gas of central area is strong to the absorptance fringe region measuring light.
According to the method for controlling combustion of above-mentioned industrial furnace, alternatively, the fuel of metering input industrial furnace and oxygen flow, and be sent to described comparison device;
Described comparison device according to described fuel and oxygen flow, original consumption and obtain the saving of fuel and oxygen, and is sent to described calculation element;
Described calculation element is according to described saving, running time and obtain the Combustion System effect of industrial furnace.
According to the method for controlling combustion of above-mentioned industrial furnace, preferably, the combustion position in described industrial furnace preheating section of kiln, soaking zone, bringing-up section is separately adjusted.
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: heating furnace each section of atmosphere segmentation detects, Discrete control;
2, energy-saving effect is excellent: dynamic conditioning fired state, burning is made to be in optimum state, save a large amount of fuel, reduce the amount of oxidation loss of workpiece in stove simultaneously, significantly enhance 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: to monitor fuel content in real time, in time adjustment oxygen and fuel (as coal gas) flow, after making to burn, in flue gas, fiery gas bulk concentration is in safe range, avoids 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, can 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 detected 2(as CO) content with fuel, can realize fired state dynamic conditioning, and determine 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 it is easily understood that: these accompanying drawings only for illustrating technical scheme of the present invention, and and are not intended to be construed as limiting protection scope of the present invention.In figure:
Fig. 1 is the structure diagram of the control system of industrial furnace according to the embodiment of the present invention 1;
Fig. 2 is the structure diagram of the combustion control device according to the embodiment of the present invention 1;
Fig. 3 is the flow chart of the method for controlling combustion of industrial furnace according to 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.
Detailed description of the invention
Fig. 1-5 and following description describe Alternate embodiments of the present invention and how to implement to instruct those skilled in the art and to reproduce the present invention.In order to instruct technical solution of the present invention, simplifying or having eliminated some conventional aspects.Those skilled in the art should understand that the modification that is derived from these embodiments or replace will within the scope of the invention.Those skilled in the art should understand that following characteristics can combine to form multiple modification of the present invention in every way.Thus, the present invention is not limited to following Alternate embodiments, and only by claim and their equivalents.
Embodiment 1:
Fig. 1 schematically illustrates the structure diagram of the 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 detecting 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 the relative both sides of industrial furnace respectively with detector, makes optical path pass gas in industrial furnace; Laser instrument and detector can also be made to be arranged on side, and light-reflecting components is arranged on relative opposite side, makes to measure light and passes twice through gas in industrial furnace.
Combustion control device, described combustion control device is optimized for the data sent according to described laser spectrum checkout gear, the combustion position adjusted in described industrial furnace; Particularly, the parameter of the gas content such as oxygen, carbon monoxide that described laser spectrum checkout gear records reflects the combustion position in industrial furnace, control device removes the flow of the gas such as oxygen, carbon monoxide adjusted in input industrial furnace according to the combustion position of actual measurement, or the amount of other types fuel, as oil product, thus make the burning in each section of described industrial furnace be in optimum state, reduce Fuel Consumption on the one hand, also reduce the oxidization burning loss of the heated parts that too much oxygen brings on the other hand.
Oxidization burning loss checkout gear, testing result for detecting the oxidization burning loss of the workpiece in described industrial furnace, and is sent to comparison device by described oxidization burning loss checkout gear; Oxidization burning loss checkout gear is the state of the art, does not repeat them here.
Comparison device, described comparison device is used for according to the described testing result received, original oxidization burning loss situation and know comparison result, and is sent to calculation element; This compare device realizes by software or circuit.
Calculation element, described calculation element is used for according to running time of described control system, the described comparison result that receives and obtain the Combustion System effect of described industrial furnace, also the reduction of Combustion System rear oxidation scaling loss is namely adopted, this reduction can be converted to the economic benefit of control system owner unit, and the supplier of control system can extract a part using as income from described economic benefit.
In order to more effectively 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 that described laser spectrum checkout gear is formed, 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) measuring light, and the absorption of fringe region can be ignored.
In order to combustion position in industrial furnace truly can be reflected and for FEEDBACK CONTROL, preferably, the top 10-50cm being in burner in described industrial furnace for the light path detecting gas content that described laser spectrum checkout gear is formed, this region is flame burn area, or between heated parts and burner, to detect the combustion atmosphere of near workpieces exactly.
In order to record the ignition temperature in industrial furnace accurately, fast, at low cost, alternatively, described laser spectrum checkout gear is also for detecting the temperature in described industrial furnace, and concrete metering system is the state of the art, does not repeat them here.
Fig. 2 schematically illustrates 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 comprises further:
First comparing module (circuit or software), described first comparing module is used for the temperature measured value in comparison when optimum state (industrial furnace combustion be in) desired temperature, described industrial furnace, and comparison situation is sent to the first control module;
First control module (circuit or software), described first control module is used for controlling according to described comparison situation to lead to the fuel in described industrial furnace and oxygen flow:
If observed temperature value is higher than setting value, then reduce 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 is lower than setting value, then improve 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 comprises further:
Second comparing module (circuit or software), the gas content measured value that described second comparing module is used for comparison when optimum state (industrial furnace combustion be in) gas content setting value, described laser spectrum checkout gear is sent here, comparison situation is sent to the second control module;
Second control module (circuit or software), described second control module is used for controlling according to described comparison situation to lead to the fuel in described industrial furnace or oxygen flow:
If fuel content measured value higher than setting value, then improves oxygen flow, as the valve of regulable control air mass flow;
If oxygen content measured value higher than setting value, then reduces oxygen flow.
In order to effectively record the temperature in industrial furnace, preferably, the light path for detected temperatures that described laser spectrum checkout gear is formed is in the top 2-20cm of workpiece in industrial furnace.
In order to obtain Combustion System effect further, the flow of flowmeter metering fuel and oxygen, and be sent to described comparison device, comparison device obtains the fuel and gas flow saved compared with existing control mode, and be sent to calculation element, calculation element is according to the fuel saved and gas flow, the reduction of oxidization burning loss, running time and calculate owing to adopting above-mentioned combustion control system and method and the economic benefit obtained, combustion control system supplier from described economic benefit Extraction parts as income, withdrawal ratio is by owner unit, supplier is by prior reducing energy consumption protocol conventions.
In order to avoid leaking out influence area into steel mouth, preferably, described laser spectrum checkout gear is at least 1.5m to the distance entering steel side of described industrial furnace preheating section of kiln.
To leak out influence area to avoid tapping hole, 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 schematically illustrates a kind of method for controlling combustion of industrial furnace, and be also the method for work of the combustion control system of above-mentioned industrial furnace, 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 detecting the gas content in described industrial furnace;
(A2) data sent according to described laser spectrum checkout gear and optimize, the combustion position adjusted in described industrial furnace;
(A3) oxidization burning loss checkout gear detects the oxidization burning loss of the workpiece in described industrial furnace, and testing result is sent to comparison device;
(A4) comparison device is according to the described testing result received, original oxidization burning loss situation and know comparison result, and is sent to calculation element;
(A5) calculation element is according to running time, the described comparison result that receives and obtain the Combustion System effect of described 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.These detection methods are all prior aries, do not repeat them here.
In order to make the burning in industrial furnace be 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 oxidative atmosphere or neutral atmosphere.
In order to effectively record the temperature in industrial furnace, alternatively, described laser spectrum checkout gear is also for detecting the temperature in described industrial furnace.
In order to the combustion position in accurate, quick feedback control industrial furnace, to make burning be in optimum state, alternatively, step (A2) is further comprising the steps:
(B1) the first comparing module (software or circuit) is for the temperature measured value in comparison when optimum state (industrial furnace combustion be in) desired temperature, described industrial furnace, and comparison situation is sent to the first control module;
(B2) the first control module (software or circuit) controls according to described comparison situation to lead to the fuel in described industrial furnace and/or oxygen flow:
If observed temperature value is higher than setting value, then reduces fuel flow rate and/or oxygen flow, and turn back to step (B1);
If observed temperature value is lower than setting value, then improves fuel flow rate and/or oxygen flow, and turn back to step (B1);
If observed temperature value equals setting value, then enter next step.
In order to optimize the burning in industrial furnace better, alternatively, step (A2) is further comprising the steps:
(C1) the content measured value that the second comparing module (software or circuit) comparison when optimum state (industrial furnace combustion be in) 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) controls according to described comparison situation to lead to the fuel in described industrial furnace or oxygen flow:
If fuel content measured value higher than setting value, then improves oxygen flow, turn back to step (B1);
If oxygen content measured value higher than setting value, then 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, step (A2) is further comprising the steps:
(D1) the oxygen content measured value that sends of the 3rd comparison module oxygen content setting value, described laser spectrum checkout gear, 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, step (A2) is further comprising the steps:
(D3) judge whether the fuel content measured value that described laser spectrum checkout gear sends exceeds standard:
If fuel content measured value exceeds standard, then adjust oxygen content setting value, turn back to step (D1);
If fuel content measured value does not exceed standard, then maintain current oxygen content setting value.
In order to metering combustion control effects better, alternatively, in above-mentioned control procedure, the flow of flowmeter metering fuel and air input heating furnace, and be sent to comparison device (having the gas flow heating same workpiece in the past and consume), thus obtain the fuel and gas flow saved compared with existing control mode, and be sent to calculation element, calculation element is according to the fuel saved and gas flow, the reduction of oxidization burning loss, running time and calculate owing to adopting above-mentioned combustion control system and method and the economic benefit obtained, combustion control system supplier from described economic benefit Extraction parts as income, withdrawal ratio is by owner unit, supplier is by prior reducing energy consumption protocol conventions.
In order to strengthen the Combustion System effect of industrial furnace further, separately control the combustion position of bringing-up section, preheating section, soaking zone in industrial furnace.
Be according to the benefit that control system and the control method of the industrial furnace of the embodiment of the present invention 1 reach: the gas content that the laser spectrum checkout gear of employing records, temperature reflect the combustion position in industrial furnace accurately and rapidly, and the introducing of control mode makes the burning in industrial furnace be in the best, fuel and gas consumption is made to be in optimum state, the oxidization burning loss of heated parts is also in reduced levels, substantially increase the economic benefit of owner unit, and then improve the income of supplier.
Embodiment 2:
According to combustion control system and the application examples of control method in heater for rolling steel of the industrial furnace of the embodiment of the present invention 1.
Fig. 4,5 sets forth and the level of laser spectrum checkout gear of use-case, vertical direction should install sketch, 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, is in 10 ~ 50cm above each section of top burner; On this height and position, install, easy to maintenance, and light path is good; In the horizontal direction, preheating section: avoid leaking out influence area (distance enters steel side 2.2m) into steel mouth, two burner centers of the section of getting center deflection bringing-up section; Bringing-up section: the section of getting center; Soaking zone: avoid tapping hole and to leak out two burner centers of influence area (distance tapping side 2m), the section of getting center deflection bringing-up section.Gas (oxygen and the carbon monoxide) concentration recorded 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 furnace wall annex several partial points region does not almost affect 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 is according to steel billet kind setting heating target temperature and heating target temperature bound, and preset air-fuel ratio, laser combustion control system (FOCS) sets oxygen and carbonomonoxide concentration bound.
Arranging soaking zone Air compress pump is 0.9 ~ 1.0; Bringing-up section Air compress pump is 0.95 ~ 1.05; Preheating section Air compress pump is 1.05 ~ 1.15; Soaking zone and bringing-up section are weak reducing atmosphere (having fuel to remain), namely significantly can reduce the amount of oxidation loss of steel billet under high-temperature low-oxygen; Preheating section is weak oxide atmosphere (aerobic residue), and soaking zone and the remaining fuel of bringing-up section at preheating section mixing Thorough combustion, ensure that fuel is not wasted with the remaining oxygen of preheating section.
Concrete combustion control mode is:
(B1) temperature value in the industrial furnace that records of the first comparison module desired temperature, usual manner, 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:
Require if 1 observed temperature meets setting: the uncomfortable throughput of economizing on coal of owner unit former DCS/PLC system, the oxygen recorded and carbonomonoxide concentration are sent to the second comparing module by laser spectrum checkout gear;
The gas concentration value of the second comparison module 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 received in FEEDBACK CONTROL input each section of heating furnace:
If oxygen concentration exceedes 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 exceedes 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, then enter next step.
If 2 observed temperatures are increased beyond 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 decrease beyond 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, setting interlock in system, air first regulates), and turn back to step (B1).
Above-mentioned control mode independently can be carried out in each section of heating furnace.
Adopt butterfly valve to control the flow of coal gas and air respectively, input connects the first control module and the second control module, and adopt flowmeter to measure the flow of coal gas and air respectively, output connects comparison device.Comparison device obtains compared with existing control mode, the saving of coal gas and air, calculation element according to described saving, oxidization burning loss reduction and obtain adopt this combustion control system and method after the economic benefit brought, and sign in advance according to owner unit and control system supplier energy-conservationly share agreement and draw the income that supplier should obtain.
Embodiment 3:
According to combustion control system and the application examples of control method in heater for rolling steel of the industrial furnace of the embodiment of the present invention 1.
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, is in each section between burner and workpiece; On this height and position, install, easy to maintenance, and light path is good, detects the combustion atmosphere of workpiece annex preferably; In the horizontal direction, preheating section: avoid leaking out influence area (distance enters steel side 2m) into steel mouth, two burner centers of the section of getting center deflection bringing-up section; Bringing-up section: the section of getting center; Soaking zone: avoid tapping hole and to leak out two burner centers of influence area (distance tapping side 1.8m), the section of getting center deflection bringing-up section.Gas (oxygen and the carbon monoxide) concentration recorded 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 furnace wall annex several partial points region does not almost affect 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 light path for detected temperatures that second cover laser spectrum checkout gear is formed is in the top 2-20cm of workpiece in industrial furnace.
In the course of work of above-mentioned control system:
The former DCS/PLC of owner unit is according to steel billet kind setting heating target temperature and heating target temperature bound, and arrange default air-fuel ratio, laser combustion control system (FOCS) sets oxygen and carbonomonoxide concentration bound.
Arranging soaking zone Air compress pump is 0.9 ~ 1.0; Bringing-up section Air compress pump is 0.95 ~ 1.05; Preheating section Air compress pump is 1.05 ~ 1.15; Soaking zone and bringing-up section are weak reducing atmosphere (having fuel to remain), namely significantly can reduce the amount of oxidation loss of steel billet under high-temperature low-oxygen; Preheating section is weak oxide atmosphere (aerobic residue), and soaking zone and the remaining fuel of bringing-up section at preheating section mixing Thorough combustion, ensure that fuel is not wasted with the remaining oxygen of preheating section.
Concrete combustion control mode is:
(B1) temperature value that records of the first comparison module desired temperature, laser spectrum checkout gear, 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:
Require if 1 observed temperature meets setting: the uncomfortable throughput of economizing on coal of FOCS system, the oxygen recorded and carbonomonoxide concentration are sent to the second comparing module by laser spectrum checkout gear;
The gas concentration value of the second comparison module 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 received in FEEDBACK CONTROL input each section of heating furnace:
If oxygen concentration exceedes 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 exceedes 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, then enter next step.
If 2 observed temperatures are increased beyond 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 decrease beyond setting lower limit: FOCS system increases coal gas and oxygen flow (air-fuel ratio is preset value, and in system, setting interlock, first increases oxygen flow, then increase 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 the flow of coal gas and air respectively, input connects the first control module and the second control module, and adopt flowmeter to measure the flow of coal gas and air respectively, output connects comparison device.Comparison device obtains compared with existing control mode, the saving of coal gas and air, calculation element according to described saving, oxidization burning loss reduction and obtain adopt this combustion control system and method after the economic benefit brought, and sign in advance according to owner unit and control system supplier energy-conservationly share agreement and draw the income that supplier should obtain.
Field experiment result shows: by above-mentioned Combustion System, can realize the accurate control of each section of atmosphere in heating furnace, make Air compress pump control in rational scope, the thermal efficiency utilizes and is greatly improved, heating-up temperature fluctuation amplitude significantly reduces simultaneously, reduces the fuel ton consumption of steel billet.
Embodiment 4:
According to combustion control system and the application examples of control method in heater for rolling steel of the industrial furnace of the embodiment of the present invention 1.
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, is in the top 10-50cm of each section of burner; On this height and position, install, easy to maintenance, and light path is good; In the horizontal direction, preheating section: avoid leaking out influence area (it is 1.8m that distance enters steel side) into steel mouth, two burner centers of the section of getting center deflection bringing-up section; Bringing-up section: the section of getting center; Soaking zone: avoid tapping hole and to leak out two burner centers of influence area (distance tapping side 1.2m), the section of getting center deflection bringing-up section.Gas (oxygen and the carbon monoxide) concentration recorded 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 furnace wall annex several partial points region does not almost affect 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) sets target oxygen concentration, coal gas aimed concn is interval.
Concrete combustion control mode is:
(D1) the oxygen concentration measured value that sends of the 3rd comparison module target oxygen concentration, described laser spectrum checkout gear, 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%, then reduce air mass flow, makes actual measurement oxygen concentration be adjusted to 2%;
Actual measurement oxygen concentration 1%, target oxygen concentration 2%, then increase air mass flow, makes actual measurement oxygen concentration be adjusted to 2%;
Above-mentioned adjustment also completes 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, then adjust target oxygen concentration, turn back to step (D1);
If gas concentration measured value does not exceed standard, then maintain current target oxygen concentration.
As:
Actual measurement coal gas (CO) concentration 5000ppm, coal gas aimed concn 3000ppm, target oxygen concentration 2%, then target oxygen concentration is adjusted to 2.2%, and turns back to step (D1);
Actual measurement coal gas (CO) concentration 1500ppm, coal gas aimed concn 3000ppm, target oxygen concentration 2%, then 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 the flow of coal gas and air respectively, input connects the first control module and the second control module, and adopt flowmeter to measure the flow of coal gas and air respectively, output connects comparison device.Comparison device obtains compared with existing control mode, the saving of coal gas and air, calculation element according to described saving, oxidization burning loss reduction and obtain adopt this combustion control system and method after the economic benefit brought, and sign in advance according to owner unit and control system supplier energy-conservationly share agreement and draw the income that supplier should obtain.
Field experiment result shows: by above-mentioned Combustion System, can realize the accurate control of each section of atmosphere in heating furnace, make Air compress pump control in rational scope, the thermal efficiency utilizes and is greatly improved, heating-up temperature fluctuation amplitude significantly reduces simultaneously, reduces the fuel ton consumption of steel billet.
Embodiment 5:
According to combustion control system and the application examples of control method in heater for rolling steel of the industrial furnace of the embodiment of the present invention 1.
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, is in each section between burner and workpiece; On this height and position, install, easy to maintenance, and light path is good; In the horizontal direction, preheating section: avoid leaking out influence area (distance enters steel side 1.5m) into steel mouth, two burner centers of the section of getting center deflection bringing-up section; Bringing-up section: the section of getting center; Soaking zone: avoid tapping hole and to leak out two burner centers of influence area (distance tapping side 1m), the section of getting center deflection bringing-up section.Gas (oxygen and the carbon monoxide) concentration recorded 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 furnace wall annex several partial points region does not almost affect 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) sets target oxygen concentration, target temperature, coal gas aimed concn interval.
Concrete combustion control mode is:
(B1) temperature value that records of the first comparison module target temperature, traditional mode, 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 sends of the 3rd comparison module target oxygen concentration, described laser spectrum checkout gear, 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%, then reduce air mass flow, makes actual measurement oxygen concentration be adjusted to 2%;
Actual measurement oxygen concentration 1%, target oxygen concentration 2%, then increase air mass flow, makes actual measurement oxygen concentration be adjusted to 2%;
Above-mentioned adjustment completes 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, then adjust target oxygen concentration, turn back to step (D1);
If fuel concentration measured value does not exceed standard, then maintain current target oxygen concentration.
As:
Actual measurement coal gas (CO) concentration 5000ppm, coal gas aimed concn 3000ppm, target oxygen concentration 2%, then target oxygen concentration is adjusted to 2.2%, and turns back to step (D1);
Actual measurement coal gas (CO) concentration 1500ppm, coal gas aimed concn 3000ppm, target oxygen concentration 2%, then 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 the flow of coal gas and air respectively, input connects the first control module and the second control module, and adopt flowmeter to measure the flow of coal gas and air respectively, output connects comparison device.Comparison device obtains compared with existing control mode, the saving of coal gas and air, calculation element according to described saving, oxidization burning loss reduction and obtain adopt this combustion control system and method after the economic benefit brought, and sign in advance according to owner unit and control system supplier energy-conservationly share agreement and draw the income that supplier should obtain.
Field experiment result shows: by above-mentioned Combustion System, can realize the accurate control of each section of atmosphere in heating furnace, make Air compress pump control in rational scope, the thermal efficiency utilizes and is greatly improved, heating-up temperature fluctuation amplitude significantly reduces simultaneously, reduces the fuel ton consumption of steel billet.

Claims (16)

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 detecting the gas content in described industrial furnace, and described laser spectrum checkout gear is also for detecting the temperature in described industrial furnace; Described laser spectrum checkout gear comprises laser instrument, detector and analysis module;
Combustion control device, described combustion control device is optimized for the data sent according to described laser spectrum checkout gear, the combustion position adjusted in described industrial furnace; Soaking zone and the remaining fuel of bringing-up section with the remaining oxygen of preheating section at preheating section mixing Thorough combustion;
Oxidization burning loss checkout gear, testing result for detecting the oxidization burning loss of the workpiece in described industrial furnace, and is sent to comparison device by described oxidization burning loss checkout gear;
Comparison device, described comparison device is used for according to the described testing result received, original oxidization burning loss situation and know comparison result, and is sent to calculation element;
Calculation element, described calculation element is used for according to running time of described control system, the described comparison result that receives and obtain the Combustion System effect of described industrial furnace;
First comparing module, described first comparing module is used for the temperature measured value in comparison desired temperature, industrial furnace, and comparison situation is sent to the first control module;
First control module, described first control module is used for controlling according to described comparison situation to lead to the fuel in described industrial furnace and oxygen flow:
If temperature measured value is higher than setting value, then reduce fuel or/and oxygen flow;
If temperature measured value is lower than setting value, then improve fuel or/and oxygen flow;
Second comparing module, the content measured value that described second comparing module is used for comparison content setting value, described laser spectrum checkout gear sends, comparison situation is sent to the second control module;
Second control module, described second control module is used for controlling according to described comparison situation to lead to the fuel in described industrial furnace or oxygen flow:
If carbon monoxide content measured value higher than setting value, then improves oxygen flow; Or,
If oxygen content measured value higher than setting value, then reduces oxygen flow.
2. combustion control system according to claim 1, is characterized in that: the top 10-50cm being in burner in described industrial furnace for the light path detecting gas content that described laser spectrum checkout gear is formed, or between heated parts and burner.
3. combustion control system according to claim 1, is characterized in that: on the optical path that described laser spectrum checkout gear is formed, and on unit light path, in industrial furnace, the gas of central area is strong to the absorptance fringe region measuring light.
4. combustion control system according to claim 1, is characterized in that: the light path for detected temperatures that described laser spectrum checkout gear is formed is in the top 2-20cm of workpiece in industrial furnace.
5. combustion control system according to claim 1, is characterized in that: described laser spectrum checkout gear is at least 1.5m to the distance entering steel side of described industrial furnace preheating section of kiln.
6. 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.
7. 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 detecting the gas content in described industrial furnace and the temperature in described industrial furnace;
(A2) data sent according to described laser spectrum checkout gear and optimize, the combustion position adjusted in described industrial furnace; Soaking zone and the remaining fuel of bringing-up section with the remaining oxygen of preheating section at preheating section mixing Thorough combustion;
Step (A2) is further comprising the steps:
(B1) the first comparing module is used for the temperature measured value in comparison desired temperature, described industrial furnace, and comparison situation is sent to the first control module;
(B2) the first control module controls according to described comparison situation to lead to the fuel in described industrial furnace and oxygen flow:
If temperature measured value is higher than setting value, then reduces fuel flow rate and/or oxygen flow, and turn back to step (B1);
If temperature measured value is lower than setting value, then improves fuel flow rate and/or oxygen flow, and turn back to step (B1);
If temperature measured value equals setting value, enter step (C1);
(C1) the gas content measured value that sends of the second comparison module gas content setting value, described laser spectrum checkout gear, comparison situation is sent to the second control module;
(C2) the second control module controls according to described comparison situation to lead to the fuel in described industrial furnace or oxygen flow:
If carbon monoxide content measured value higher than setting value, then improves oxygen flow, turn back to step (B1);
If oxygen content measured value higher than setting value, then reduces oxygen flow, turn back to step (B1);
If gas content measured value meets setting value, enter next step;
(A3) oxidization burning loss checkout gear detects the oxidization burning loss of the workpiece in described industrial furnace, and testing result is sent to comparison device;
(A4) comparison device is according to the described testing result received, original oxidization burning loss situation and know comparison result, and is sent to calculation element;
(A5) calculation element is according to running time, the described comparison result that receives and obtain the Combustion System effect of described industrial furnace.
8. method for controlling combustion according to claim 7, 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.
9. method for controlling combustion according to claim 7, is characterized in that: the soaking zone of described industrial furnace and bringing-up section are reducing atmosphere.
10. method for controlling combustion according to claim 7, is characterized in that: the fuel of metering input industrial furnace and oxygen flow, and is sent to described comparison device;
Described comparison device according to described fuel and oxygen flow, original consumption and obtain the saving of fuel and oxygen, and is sent to described calculation element;
Described calculation element obtains the Combustion System effect of industrial furnace according to described saving, running time and the described comparison result that receives.
11. method for controlling combustion according to claim 7, is characterized in that: separately adjust the combustion position in described industrial furnace preheating section of kiln, soaking zone, bringing-up section.
The method for controlling combustion of 12. 1 kinds of industrial furnaces, 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 detecting the gas content in described industrial furnace and the temperature in described industrial furnace;
(A2) data sent according to described laser spectrum checkout gear and optimize, the combustion position adjusted in described industrial furnace; Soaking zone and the remaining fuel of bringing-up section with the remaining oxygen of preheating section at preheating section mixing Thorough combustion;
Step (A2) is further comprising the steps:
(B1) the first comparing module is used for the temperature measured value in comparison desired temperature, described industrial furnace, and comparison situation is sent to the first control module;
(B2) the first control module controls according to described comparison situation to lead to the fuel in described industrial furnace and oxygen flow:
If temperature measured value is higher than setting value, then reduces fuel flow rate and/or oxygen flow, and turn back to step (B1);
If temperature measured value is lower than setting value, then improves fuel flow rate and/or oxygen flow, and turn back to step (B1);
If temperature measured value equals setting value, enter step (D1);
(D1) the oxygen content measured value that sends of the 3rd comparison module oxygen content setting value, described laser spectrum checkout gear, 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;
(D3) judge whether the carbon monoxide content measured value that described laser spectrum checkout gear sends exceeds standard:
If carbon monoxide content measured value exceeds standard, then adjust oxygen content setting value, turn back to step (D1);
If carbon monoxide content measured value does not exceed standard, then maintain current oxygen content setting value;
(A3) oxidization burning loss checkout gear detects the oxidization burning loss of the workpiece in described industrial furnace, and testing result is sent to comparison device;
(A4) comparison device is according to the described testing result received, original oxidization burning loss situation and know comparison result, and is sent to calculation element;
(A5) calculation element is according to running time, the described comparison result that receives and obtain the Combustion System effect of described industrial furnace.
13. method for controlling combustion according to claim 12, 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.
14. method for controlling combustion according to claim 12, is characterized in that: the soaking zone of described industrial furnace and bringing-up section are reducing atmosphere.
15. method for controlling combustion according to claim 12, is characterized in that: the fuel of metering input industrial furnace and oxygen flow, and are sent to described comparison device;
Described comparison device according to described fuel and oxygen flow, original consumption and obtain the saving of fuel and oxygen, and is sent to described calculation element;
Described calculation element obtains the Combustion System effect of industrial furnace according to described saving, running time and the described comparison result that receives.
16. method for controlling combustion according to claim 12, is characterized in that: separately adjust the combustion position in described industrial furnace preheating section of kiln, soaking zone, bringing-up section.
CN201310712749.4A 2013-12-13 2013-12-13 The combustion control system of industrial furnace and control method CN103672948B (en)

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