CN109307437A - A kind of the optimization combustion control system and its method of heat accumulating type industrial heating furnace - Google Patents
A kind of the optimization combustion control system and its method of heat accumulating type industrial heating furnace Download PDFInfo
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- CN109307437A CN109307437A CN201811103953.5A CN201811103953A CN109307437A CN 109307437 A CN109307437 A CN 109307437A CN 201811103953 A CN201811103953 A CN 201811103953A CN 109307437 A CN109307437 A CN 109307437A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
- F27D2019/0034—Regulation through control of a heating quantity such as fuel, oxidant or intensity of current
- F27D2019/004—Fuel quantity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
- F27D2019/0034—Regulation through control of a heating quantity such as fuel, oxidant or intensity of current
- F27D2019/004—Fuel quantity
- F27D2019/0043—Amount of air or O2 to the burner
Abstract
The present invention relates to a kind of optimization combustion control system of heat accumulating type industrial heating furnace and its methods.Including Gas Pressurization Station, Gas Pressurization Station automatic control system, heating furnace, heating furnace automatic combustion control system, it further include bunch grade adjustment circuit, including PID temperature adjuster, gas flow adjuster, air regulator, calorific value correction module, residual oxygen correction module；The system operating mode are as follows: system starts, PID temperature adjuster detects heating-furnace bore temperature, pass through gas flow adjuster, the gas flow of air regulator adjusting heating furnace, air mass flow, at this time, analysis of gas caloric value instrument, residual oxygen analytical instrument detects Gas Pressurization Station respectively, calorific value of gas in heating furnace, remaining oxygen, and then it will test result and feed back to calorific value correction module respectively, residual oxygen correction module, and then control gas flow adjuster, air regulator amendment adjusts the gas flow of heating furnace, air mass flow, to reach combustion efficiency optimization.
Description
Technical field
The present invention relates to Combustion System field, the optimization combustion control system of especially a kind of heat accumulating type industrial heating furnace and
Its method.
Background technique
Burning control in heating furnace is a multi input, multi output, large time delay, close coupling, the system more than disturbance, and input quantity is
Air mass flow, gas flow, calorific value, residual oxygen etc., output quantity are the opening degree parameter of air control valve and gas regulator.Parameter
Between interfere with each other, and exterior disturbing factor is numerous, including the parameters such as calorific value of gas, mixed gas pressure, air pressure
Fluctuation, can interference stability system, it is therefore desirable to formulate complete control program, avoid the occurrence of big oscillation, so that automatically
Control system can be with stable operation.
The coke that the fuel of metallurgical industry heating furnace generallys use the blast furnace gas of iron-smelting process generation and coking process generates
Producer gas, the two mix in proportion, pressurize, to obtain the Mixture Density Networks for meeting burning control in heating furnace requirement after purification
Gas.
Under normal circumstances, the calorific value of heating furnace mixed gas should be controlled in 1800 ± 70 kcal/ m3, Mixture Density Networks air pressure
Power control is in 5KPa or more and keeps stable, otherwise burning control in heating furnace will be caused to fluctuate, and even result in heating furnace and stop
Furnace interlocking movement.Wherein high, coke-stove gas calorific value and pressure limit are shown in Table 1.
Burning Control System of Heating Furnace more advanced at present generally uses tandem parallel connection bi -cross limitation control circuit, this
The effect of control is that coal gas and air mass flow are mutually coordinated, keeps certain suitable ratio, so that guaranteeing fire box temperature satisfaction
While technique requires, gas-fired is more abundant, thus plays good promotion to thermal efficiency of heating furnace is improved.In this control
During system, empty coal stoichiometric factor δ value plays the role of very vital.But due to traditional tandem parallel connection bicrossing limitation
The δ value of control loop mostly use manually mode set so that control output cannot react the variation of operating condition, such as coal in time
The variation of oxygen content in gas calorific value, flue gas, and control effect is related with artificial setting experience, control continuity is not strong, to draw
Play the fluctuation of final heating quality.
Calorific value signal is shown in operation to detect mixed gas calorific value by the caloric value instrument that most of heating furnaces use at present
On picture, for instructing manual operation, i.e., when calorific value of gas is higher, operator reduces empty coal stoichiometric factor δ value,
It is then improved when opposite.Calorific value parameter is only used as Operating Guideline, does not participate in burning control in heating furnace, and heating furnace is caused to fire
Burn control system does not have automatic control means to be intervened in hot-restriking die, so that control effect is poor.In addition, caloric value instrument is hard
Part equipment has the following problems in During Process of Long-term Operation: 1, the hot-restriking die of mixed gas is big, leads to detection inaccuracy；2, it mixes
It is more to close gas impurity, and the pipeline in caloric value instrument is thinner, be easy to cause blocking, causes caloric value instrument frequently to stop working and causes in signal
It is disconnected.The above reason, so that gas calorific value apparatus being extremely limited in the application of industrial heating furnace, metallurgy at home at present
Heating furnace industry, the example that caloric value instrument can be run steadily in the long term are very few.Factors above is all to restrict burning control in heating furnace
The problem that effect further increases.
Summary of the invention
The purpose of the present invention is to provide a kind of optimization combustion control system of heat accumulating type industrial heating furnace and its method, poles
The earth improves heating furnace efficiency of combustion, and on-line dynamic measurement is high, coke gas flow data, calorific value of gas signal it is accurate and
Stablize, in addition, having saved fuel, reducing environmental pollution and having improved product quality, reduces the cost of manual maintenance.
To achieve the above object, the technical scheme is that a kind of optimization Combustion System of heat accumulating type industrial heating furnace
System, Gas Pressurization Station automatic control system and coal gas including Gas Pressurization Station, for controlling Gas Pressurization Station working condition
Heating furnace that pressurizing point is connected by pipeline, the heating furnace automatic combustion control system for controlling heating furnace working condition, institute
It states Gas Pressurization Station automatic control system to connect with the heating furnace automatic combustion control system, the Gas Pressurization Station is controlled automatically
System processed includes the analysis of gas caloric value instrument for detecting calorific value of gas in Gas Pressurization Station, the heating furnace automatic combustion control
System includes the residual oxygen analytical instrument for detecting remaining oxygen in heating furnace；Further include bunch grade adjustment circuit, including adds for detecting
The PID temperature adjuster of hot stove fire box temperature, the gas flow adjuster for adjusting gas flow in heating furnace, for adjusting
It heats the air regulator of oven air flow rate, be set between PID temperature adjuster and gas flow adjuster and by coal
The calorific value correction module of gas calorific value analyser output signal control is set between PID temperature adjuster and air regulator
And the residual oxygen correction module controlled by residual oxygen analytical instrument output signal；The system operating mode are as follows: system starts, PID temperature
It spends adjuster and detects heating-furnace bore temperature, the coal gas of heating furnace is adjusted by gas flow adjuster, air regulator
Flow, air mass flow, at this point, analysis of gas caloric value instrument, residual oxygen analytical instrument detect Gas Pressurization Station, the coal gas in heating furnace respectively
Calorific value, remaining oxygen, and then will test result and feed back to calorific value correction module, residual oxygen correction module respectively, and then control Gas Flow
Adjuster, the gas flow of air regulator amendment adjusting heating furnace, air mass flow are measured, to reach combustion efficiency optimization
Change.
In an embodiment of the present invention, the residual oxygen detection is mounted on the position of 3m before the heat exchanger of heating furnace.
In an embodiment of the present invention, the residual oxygen detection is direct insertion Zirconium oxide analyzer.
In an embodiment of the present invention, the calorific value correction module, residual oxygen correction module are all made of reverse phase scale operation electricity
Road.
In an embodiment of the present invention, the air regulator includes air flow meter, air flow rate adjustment valve, institute
Stating gas flow adjuster includes gas flow meter, gas flow regulating valve.
The present invention also provides a kind of control methods based on system described above, include the following steps:
Step S1, system starts, PID temperature adjuster detect heating-furnace bore temperature, the temperature set according to process conditions
Degree is arranged gas flow setting signal, air mass flow setting signal, and passes through gas flow adjuster, air regulator
Adjust gas flow, the air mass flow of heating furnace；
Step S2, analysis of gas caloric value instrument, residual oxygen analytical instrument detect the Gas Pressurization Station, calorific value of gas in heating furnace, residual respectively
Oxygen amount, and will test result and feed back to calorific value correction module, residual oxygen correction module respectively；
Step S3, when the calorific value of gas that calorific value correction module receives is higher than calorific value of gas threshold value, gas flow setting letter is reduced
Number, then increase gas flow setting value when opposite；Similarly, the remaining oxygen that residual oxygen correction module receives is higher than remaining oxygen threshold value
When, air mass flow setting signal is reduced, then increases air mass flow setting value when opposite；
Step S4, the air flow meter detection of air regulator enters the air mass flow FA of heating furnace, by air mass flow FA
After carrying out division calculation with preset sky coal stoichiometric factor δ, with predetermined coefficient K1、K3Multiplying is carried out, B and C are respectively obtained
Value, calculation formula are as follows:
B=(FA/δ)×K3
C=(FA/δ)×K1
B value is compared with the revised gas flow setting signal of calorific value correction module and is maximized, then is compared with C value
Compared with being minimized the setting signal as gas flow adjuster, the coal gas of output control Signal Regulation gas flow adjuster
The opening degree of flow control valve realizes the cross limiting range control of gas flow；
Similarly, gas flow adjuster gas flow meter detection enter heating furnace gas flow FF, by air mass flow FF with
After preset sky coal stoichiometric factor δ carries out division calculation, with predetermined coefficient K2、K4Multiplying is carried out, D and E value is respectively obtained,
Calculation formula is as follows:
D=FF×δ×K4
E=FF×δ×K2
D, E carries out the slicing operation similar with B, C with the revised air mass flow setting signal of residual oxygen correction module again, obtains sky
The setting signal of throughput adjuster, the opening of the air flow rate adjustment valve of output control signal control air regulator
Degree realizes the cross limiting range control of air.
In an embodiment of the present invention, the predetermined coefficient K1、K2、K3、K4According to heating furnace furnace type structure, technological parameter,
Control requires to carry out adjusting adjusting.
In an embodiment of the present invention, the gas flow of the step S1, both air flow modulation process are identical as step S4.
Compared to the prior art, the invention has the following advantages:
1, heating furnace efficiency of combustion is greatly improved
The setting value of gas flow and air mass flow is modified respectively using calorific value of gas and residual oxygen signal, it can be rapidly
Reflect the variation of combustion conditions, adjustment sky, gas flow, effectively increase heating furnace combustion efficiency in time, add to ensure that
The accurate and timeliness of hot stove fire box temperature control；
2, on-line dynamic measurement height, coke gas flow data, calorific value of gas signal is accurate and stablizes；
The method calculated using high, coke gas flow, is capable of the variation of real-time, online computing heating value dynamic data, and pass through
The mode of system communication passes to rapidly heating furnace automatic combustion control system, so as to adjust furnace fuel stream in advance
Amount guarantees the stability and continuity of furnace temp control, control effect to reduce because of furnace temperature fluctuation caused by hot-restriking die
Fruit significantly improves；
3, Gas Pressurization Station control technique is improved
On gas pressing station control system, mixed gas calorific value is calculated using existing high, coke-stove gas flow, therefore
Available real-time, intuitive calorific value signal reduces production management cost to improve the control technique of Gas Pressurization Station,
Condition is provided to advanced optimize gas pressing station control system；
4, fuel has been saved, environmental pollution is reduced
Take full advantage of the important function of calorific value of gas and residual oxygen concentration signal in Combustion System, the traditional string of Optimal improvements
Grade bi -cross limitation control in parallel circuit, reduces fuel consumption, heat loss, and section is imitated to improve the burning of heating furnace
Rate reduces environmental pollution；Therefore, implementation of the invention can bring considerable economic and social benefit；
5, product quality is improved, the cost of manual maintenance is reduced
The calorific value of mixed gas is obtained using the method that calorific value of gas calculates, and is had high economic benefit and social benefit；
6, device hardware investment is reduced, standby redundancy cost is reduced
It is complete using the existing blast furnace gas flow of Gas Pressurization Station automatic control system and coke gas flow as data source
The method of complete utilization software obtains the data of mixed gas calorific value, and only increases a communication cable line and transmit calorific value information
Heating furnace automatic combustion control system is given, the expense of expensive caloric value instrument hardware device and standby redundancy, the throwing of hardware are eliminated
Entering can almost ignore, and the function of control system is also fully played；
In summary it analyzes, the optimization combustion control system and its method of recuperative heater of the invention have good economy
Benefit and social benefit, be worthy to be popularized reference.
Detailed description of the invention
Fig. 1 is the improved Combustion System flow chart of the present invention.
Specific embodiment
With reference to the accompanying drawing, technical solution of the present invention is specifically described.
The present invention provides a kind of optimization combustion control systems of heat accumulating type industrial heating furnace, including Gas Pressurization Station, use
Added in the Gas Pressurization Station automatic control system and Gas Pressurization Station of control Gas Pressurization Station working condition by what pipeline connected
Hot stove, the heating furnace automatic combustion control system for controlling heating furnace working condition, the Gas Pressurization Station automatically control system
System is connect with the heating furnace automatic combustion control system, and the Gas Pressurization Station automatic control system includes for detecting coal gas
The analysis of gas caloric value instrument of calorific value of gas in pressurizing point, the heating furnace automatic combustion control system includes for detecting heating furnace
The residual oxygen analytical instrument of middle remaining oxygen；It further include bunch grade adjustment circuit, including the PID temperature tune for detecting heating-furnace bore temperature
Section device, the gas flow adjuster for adjusting gas flow in heating furnace, the air for adjusting heating oven air flow rate
Flow regulator is set between PID temperature adjuster and gas flow adjuster and by analysis of gas caloric value instrument output signal control
The calorific value correction module of system is set between PID temperature adjuster and air regulator and by residual oxygen analytical instrument output signal
The residual oxygen correction module of control；The system operating mode are as follows: system starts, PID temperature adjuster detect heating furnace burner hearth
Temperature adjusts the gas flow of heating furnace, air mass flow by gas flow adjuster, air regulator, at this point, coal gas
Calorimetry instrument, residual oxygen analytical instrument detect Gas Pressurization Station, the calorific value of gas in heating furnace, remaining oxygen respectively, and then will test
As a result calorific value correction module, residual oxygen correction module are fed back to respectively, and then control gas flow adjuster, air regulator
Amendment adjusts the gas flow of heating furnace, air mass flow, to reach combustion efficiency optimization.
The residual oxygen detection is mounted on the position of 3m before the heat exchanger of heating furnace.The residual oxygen detection is direct insertion oxygen
Change zirconium analyzer.
The calorific value correction module, residual oxygen correction module are all made of reverse phase scaling circuit.
The air regulator includes air flow meter, air flow rate adjustment valve, the gas flow adjuster packet
Include gas flow meter, gas flow regulating valve.
The present invention also provides a kind of control methods based on system described above, include the following steps:
Step S1, system starts, PID temperature adjuster detect heating-furnace bore temperature, the temperature set according to process conditions
Degree is arranged gas flow setting signal, air mass flow setting signal, and passes through gas flow adjuster, air regulator
Adjust gas flow, the air mass flow of heating furnace；
Step S2, analysis of gas caloric value instrument, residual oxygen analytical instrument detect the Gas Pressurization Station, calorific value of gas in heating furnace, residual respectively
Oxygen amount, and will test result and feed back to calorific value correction module, residual oxygen correction module respectively；
Step S3, when the calorific value of gas that calorific value correction module receives is higher than calorific value of gas threshold value, gas flow setting letter is reduced
Number, then increase gas flow setting value when opposite；Similarly, the remaining oxygen that residual oxygen correction module receives is higher than remaining oxygen threshold value
When, air mass flow setting signal is reduced, then increases air mass flow setting value when opposite；
Step S4, the air flow meter detection of air regulator enters the air mass flow FA of heating furnace, by air mass flow FA
After carrying out division calculation with preset sky coal stoichiometric factor δ, with predetermined coefficient K1、K3Multiplying is carried out, B and C are respectively obtained
Value, calculation formula are as follows:
B=(FA/δ)×K3
C=(FA/δ)×K1
B value is compared with the revised gas flow setting signal of calorific value correction module and is maximized, then is compared with C value
Compared with being minimized the setting signal as gas flow adjuster, the coal gas of output control Signal Regulation gas flow adjuster
The opening degree of flow control valve realizes the cross limiting range control of gas flow；
Similarly, gas flow adjuster gas flow meter detection enter heating furnace gas flow FF, by air mass flow FF with
After preset sky coal stoichiometric factor δ carries out division calculation, with predetermined coefficient K2、K4Multiplying is carried out, D and E value is respectively obtained,
Calculation formula is as follows:
D=FF×δ×K4
E=FF×δ×K2
D, E carries out the slicing operation similar with B, C with the revised air mass flow setting signal of residual oxygen correction module again, obtains sky
The setting signal of throughput adjuster, the opening of the air flow rate adjustment valve of output control signal control air regulator
Degree realizes the cross limiting range control of air.
The predetermined coefficient K1、K2、K3、K4It requires to carry out adjusting tune according to heating furnace furnace type structure, technological parameter, control
Section.
The gas flow of the step S1, both air flow modulation process are identical as step S4.
The following are specific implementation processes of the invention.
Present design mainly includes three parts, and first part is in Gas Pressurization Station using high, coke gas flow rate calculation
Mode, obtain calorific value signal, this calorific value signal passed into heating furnace automatic combustion control system, the flow of coal gas is carried out
Correction and Control；Second part is from the flue gas after heating furnace burning, to detect the height of residual oxygen concentration using residual oxygen analytical instrument
It is low, residual oxygen concentration signal is then passed into heating furnace automatic combustion control system, the control signal of correction air flow；Third
Part is the improvement in tandem parallel connection bi -cross limitation control circuit, including introduces calorific value amendment and residual oxygen correction module, to furnace temperature
The output of adjuster is modified.Main key protection point of the invention is Part III.This three parts is carried out below detailed
Description.
1, mixed gas calorific value signal
The exhaust gas that the mixed gas of industrial heating furnace is given off from blast furnace, coke oven production, in these exhaust gas by filtering,
Gas Pressurization Station is sent to after purification to be mixed and pressurizeed, it is defeated through piping after the technological parameter requirement for reaching heating furnace burning
Be sent to heating furnace, thus Gas Pressurization Station technology controlling and process be mainly to the flow of one pack system and mixed gas, pressure and other parameters into
Row real-time detection and control.
Acquisition of the present invention combination Gas Pressurization Station automatic control system to above-mentioned technological parameter, utilizes Gas Pressurization Station
Computer control system obtains the calorific value Q of mixed gas using the method that software calculates, then by way of communication, number
Implement to control according to passing to heating furnace automatic combustion control system, then by heating furnace automatic combustion control system, adjusts Gas Flow
Amount, reaches best combustion efficiency.The Gas Pressurization Station and heating furnace of current each factory are substantially all using computer control system,
Therefore needing increased hardware investment is only a communication cable, has both improved the control of Gas Pressurization Station and heating furnace in this way
Function utilization rate, while the defect of the faults frequent occurred in the conventional caloric value instrument course of work is in turn avoided, mitigate plant maintenance
Cost, and burning control in heating furnace effect is greatly improved, promote the heating quality of product.
(1) determination of coal gas each component calorific value
The coal gas that metallurgical industry heating furnace uses is generally the mixed gas of blast furnace gas (BFG) and coke-stove gas (COG), this two
Kind of gas is blast furnace process and coke oven smelt after the byproduct that generates, ingredient and content and the technique of smelting have substantial connection,
The property of gas is relatively stable.According to the artificial chemical examination of coalification quality testing department as a result, the calorific value of BFG be under normal circumstances 800 ±
50 kcal/ m3Left and right, the calorific value of COG are 4500 ± 30 kcal/ m3Left and right, the two technological parameters are in normal production scenarios
It is lower to remain relatively stable.
(2) determination of coal gas each component content
By the original automatic control system of Gas Pressurization Station, the data on flows of BFG and COG, Jin Erke can be readily available
To know the concentration relationship in mixed gas between the two.Assuming that the flow of BFG is F1, the flow of COG is F2, then mixing
In gas, the ratio of BFG is, the ratio of COG is。
(3) calculating of mixed gas calorific value
The calorific value size of mixed gas can be calculated in conjunction with the calorific value of each component coal gas according to the content of each gas composition.Coal
The definition of gas calorific value, mixed gas calorific value Q be equal to each one-component gas content and calorific value product and, with BFG standard hot
Value is 800 kcal/ m3, COG standard calorific value is 4500 kcal/ m3For, obtain the calorific value Q of mixed gas are as follows:
(1)
In Gas Pressurization Station automatic control system, Q value is come out operation screen is shown above, can intuitively allow operator
Member understands current calorific value of gas size, generallys use pressure control in view of current Gas Pressurization Station to guarantee the control of calorific value of gas
The control technique for being embodied as further improving Gas Pressurization Station of mode, this programme provides possibility.
(4) communication of calorific value data
An AO point is defined in Gas Pressurization Station automatic control system, and one is defined on heating furnace automatic combustion control system
Then AI point passes through one by the calorific value data conversion being calculated in Gas Pressurization Station automatic control system at 4 ~ 20mA signal
Root cable is connected on the AI point that heating furnace automatic combustion control system defines, and the letter of calorific value size is converted by signal
Number, it can both be shown on the operation screen of heating furnace, operative employee is prompted to carry out the Q value situation of change of gas；Q value can be introduced again
In heating furnace tandem parallel connection bi -cross limitation control circuit, the dynamic regulation of air, gas flow is realized, improve efficiency of combustion.
The size of calorific value of gas signal, directly affect participate in completely burned gas flow number, if coal gas is warm
Value is high, then should reduce gas flow used for combustion, guarantees that coal gas being capable of full combustion；If calorific value of gas is low, should increase
Coal throughput, to guarantee that fire box temperature meets process control needs.So obtained calorific value of gas signal is used to correct biography
Gas flow in control loop of uniting can effectively improve the efficiency of combustion of heating furnace, and then improve Heating Furnace Control quality.
2, residual oxygen concentration signal
In the ideal situation, every section of heating furnace should all have residual oxygen to detect, and for correcting each section of flow control, but because add
Temperature of each section is very high in hot stove, general residual oxygen analytical instrument cisco unity malfunction.Therefore when considering installation site, according to furnace
The flow direction of interior gas and the draft situation of smokejack, it is known that flue gas is more concentrated before heat exchanger, and temperature is relatively
It is low, therefore residual oxygen analytical instrument is installed in the position of 3 m or so before heat exchanger.
Common residual oxygen analytical instrument is direct insertion Zirconium oxide analyzer, and the structure of all stainless steels has high sensitivity, sound
Answer speed fast and the features such as stability is good.Its working principle is when tested gas (flue gas) enters zirconium oxide by sensor
When on the inside of pipe, air enters the outside of sensor by free convection, in oxygen when the oxygen concentration difference in outside in zirconium pipe
Change outside in zirconium pipe and generates oxygen concentration potential, the oxygen concentration potential of output and the operating temperature of sensor and oxygen concentration in letter
Number corresponding relationship, to measure oxygen content γ remaining in combustion process, measurement range is within 0 ~ 20%.
The residual oxygen signal of heating furnace has directly reacted the number of air content in Combustion System, if remaining oxygen is excessively high, says
The bright air mass flow for participating in burning is superfluous；If same remaining oxygen is too low, illustrate that air mass flow is short of.Air excess is easy band
Furnace heat is walked, causes thermal loss, air is short of so that coal gas can't burn completely, and leads to energy waste, while can also go out
The phenomenon that existing chimney over-emitting black exhaust.Therefore, by the height of remaining oxygen concentration in detection flue gas, to adjust the size of air mass flow,
Air mass flow dynamic regulation performance can be made to improve, improve heating furnace efficiency of combustion.
3, the improvement in tandem parallel connection bi -cross limitation control circuit
In summary it analyzes, in order to effectively control heating-furnace bore temperature, the ratio of control sky, gas flow, this programme is being passed
It is optimized inside the tandem parallel connection bi -cross limitation control circuit of system.Concrete scheme is the introduction of calorific value of gas signal Q
It is modified with two data of remaining oxygen γ, to guarantee combustion efficiency optimization, as shown in Figure 1.
In Fig. 1, PID thermoregulator, mainly according to process conditions, controls fire box temperature satisfaction and sets as master selector
Determine temperature, gas flow adjuster FIC and air regulator FIC are as secondary controller, mainly according to the defeated of master selector
Signal out, adjusts coal gas and air mass flow size respectively, master selector and secondary controller composed cascade regulating loop together；Calorific value
Correction module and residual oxygen correction module participate in the output amendment of master selector, carry out respectively to the output signal of master selector
Amendment, i.e., be modified the flow setting value of coal gas, air, and correction module uses reverse phase scaling circuit, when coal gas heat
When value signal is high, coal gas setting signal is reduced, then increases gas flow setting value when opposite；Similarly, when residual oxygen signal is higher,
Air mass flow setting signal is reduced, increases air mass flow setting value when opposite.The air mass flow FA detected and empty coal proportion system
After number δ carries out division calculation, with COEFFICIENT K1、K3Multiplying is carried out, respectively obtains B and C value, calculation formula is as follows:
B=(FA/δ)×K3
C=(FA/δ)×K1
B value is compared with the revised gas flow setting signal of calorific value correction module and is maximized, then is compared with C value
Compared with being minimized the setting signal as gas flow adjuster, the coal gas of output control Signal Regulation gas flow adjuster
The opening degree of flow control valve realizes the cross limiting range control of gas flow；
Similarly, gas flow adjuster gas flow meter detection enter heating furnace gas flow FF, by air mass flow FF with
After preset sky coal stoichiometric factor δ carries out division calculation, with predetermined coefficient K2、K4Multiplying is carried out, D and E value is respectively obtained,
Calculation formula is as follows:
D=FF×δ×K4
E=FF×δ×K2
D, E carries out the slicing operation similar with B, C with the revised air mass flow setting signal of residual oxygen correction module again, obtains sky
The setting signal of throughput adjuster, the opening of the air flow rate adjustment valve of output control signal control air regulator
Degree realizes the cross limiting range control of air.
In the above control loop, COEFFICIENT K1、K2、K3、K4It can be wanted according to heating furnace furnace type structure, technological parameter, control
It asks and carries out adjusting adjusting, and is relatively stable, meet heating-furnace bore temperature control effect；Calorific value correction module and the amendment of residual oxygen
Module uses reverse phase ratio control algolithm, is controlled respectively according to the calorific value of gas calculated value of input and residual oxygen analytical instrument signal
System realizes that, when calorific value of gas signal increases, the output signal of calorific value correction module reduces, and output signal increases when opposite, from
And coal gas setting signal is adjusted according to calorific value signal intensity；When residual oxygen analytical instrument parameter increases, residual oxygen correction module is defeated
Reduce out, output signal increases when opposite, so that air mass flow setting value follows the variation of residual oxygen concentration signal and changes.
It designs in this way, site technique Parameters variation can be maximally utilised, accurately and efficiently improve coal, air control accuracy,
And then improve heating furnace efficiency of combustion.
Embodiment:
According to the above-mentioned technical solution, technological improvement has been carried out in certain smelter hot strip plant heating furnace and has put into fortune
Row, show that present design can substantially reduce the value of heating furnace combustion ratio coefficient, i.e., by long-time tracking and testing result
Under the requirement of identical target temperature, required gas volume and air capacity are substantially reduced, and such benefit is the reduction of fuel
Amount, heat loss reduce the oxidization burning loss of heating slab, to improve heating efficiency and heating quality.
Fuel (coal gas) rate data are saved within certain a period of time by the parameter tracking test after implementation improvement project
As shown in table 2.
As can be seen from Table 2, after control program is improved, in heating furnace difference thermic load (charging temperature) situation
Under, the control system after optimization is with the obvious advantage compared to traditional tandem bi -cross limitation control circuit saving fuel rate, and with
The increase of thermic load, save fuel rate increase considerably.In heating furnace longtime running, can be effectively reduced fuel consumption,
It reduces heat loss and reduces environmental pollution, to improve the economic and social benefits.Therefore this programme has biggish popularization
Value.
The above are preferred embodiments of the present invention, all any changes made according to the technical solution of the present invention, and generated function is made
When with range without departing from technical solution of the present invention, all belong to the scope of protection of the present invention.
Claims (8)
1. a kind of optimization combustion control system of heat accumulating type industrial heating furnace, which is characterized in that including Gas Pressurization Station, for controlling
The heating that the Gas Pressurization Station automatic control system and Gas Pressurization Station of Gas Pressurization Station working condition processed are connected by pipeline
Furnace, the heating furnace automatic combustion control system for controlling heating furnace working condition, the Gas Pressurization Station automatic control system
It is connect with the heating furnace automatic combustion control system, the Gas Pressurization Station automatic control system includes adding for detecting coal gas
The analysis of gas caloric value instrument of calorific value of gas in pressure station, the heating furnace automatic combustion control system includes for detecting in heating furnace
The residual oxygen analytical instrument of remaining oxygen；Further include bunch grade adjustment circuit, is adjusted including the PID temperature for detecting heating-furnace bore temperature
Device, the gas flow adjuster for adjusting gas flow in heating furnace, the air stream for adjusting heating oven air flow rate
Adjuster is measured, is set between PID temperature adjuster and gas flow adjuster and is controlled by analysis of gas caloric value instrument output signal
Calorific value correction module, be set between PID temperature adjuster and air regulator and by residual oxygen analytical instrument output signal control
The residual oxygen correction module of system；The system operating mode are as follows: system starts, PID temperature adjuster detect heating furnace burner hearth temperature
Degree adjusts the gas flow of heating furnace, air mass flow by gas flow adjuster, air regulator, at this point, coal gas is warm
Value analyzer, residual oxygen analytical instrument detect Gas Pressurization Station, the calorific value of gas in heating furnace, remaining oxygen respectively, and then will test knot
Fruit feeds back to calorific value correction module, residual oxygen correction module respectively, and then control gas flow adjuster, air regulator are repaired
The gas flow of positive regulator heating furnace, air mass flow, to reach combustion efficiency optimization.
2. system according to claim 1, which is characterized in that before the residual oxygen detection is mounted on the heat exchanger of heating furnace
The position of 3m.
3. system according to claim 1 or 2, which is characterized in that the residual oxygen detection is the analysis of direct insertion zirconium oxide
Instrument.
4. system according to claim 1, which is characterized in that the calorific value correction module, residual oxygen correction module are all made of
Reverse phase scaling circuit.
5. system according to claim 1, which is characterized in that the air regulator includes air flow meter, sky
Air-flow adjustable valve, the gas flow adjuster include gas flow meter, gas flow regulating valve.
6. a kind of control method based on any system of claim 1-5, which comprises the steps of:
Step S1, system starts, PID temperature adjuster detect heating-furnace bore temperature, the temperature set according to process conditions
Degree is arranged gas flow setting signal, air mass flow setting signal, and passes through gas flow adjuster, air regulator
Adjust gas flow, the air mass flow of heating furnace；
Step S2, analysis of gas caloric value instrument, residual oxygen analytical instrument detect the Gas Pressurization Station, calorific value of gas in heating furnace, residual respectively
Oxygen amount, and will test result and feed back to calorific value correction module, residual oxygen correction module respectively；
Step S3, when the calorific value of gas that calorific value correction module receives is higher than calorific value of gas threshold value, gas flow setting letter is reduced
Number, then increase gas flow setting value when opposite；Similarly, the remaining oxygen that residual oxygen correction module receives is higher than remaining oxygen threshold value
When, air mass flow setting signal is reduced, then increases air mass flow setting value when opposite；
Step S4, the air flow meter detection of air regulator enters the air mass flow FA of heating furnace, by air mass flow FA
After carrying out division calculation with preset sky coal stoichiometric factor δ, with predetermined coefficient K1、K3Multiplying is carried out, B and C are respectively obtained
Value, calculation formula are as follows:
B=(FA/δ)×K3
C=(FA/δ)×K1
B value is compared with the revised gas flow setting signal of calorific value correction module and is maximized, then is compared with C value
Compared with being minimized the setting signal as gas flow adjuster, the coal gas of output control Signal Regulation gas flow adjuster
The opening degree of flow control valve realizes the cross limiting range control of gas flow；
Similarly, gas flow adjuster gas flow meter detection enter heating furnace gas flow FF, by air mass flow FF with
After preset sky coal stoichiometric factor δ carries out division calculation, with predetermined coefficient K2、K4Multiplying is carried out, D and E value is respectively obtained,
Calculation formula is as follows:
D=FF×δ×K4
E=FF×δ×K2
D, E carries out the slicing operation similar with B, C with the revised air mass flow setting signal of residual oxygen correction module again, obtains sky
The setting signal of throughput adjuster, the opening of the air flow rate adjustment valve of output control signal control air regulator
Degree realizes the cross limiting range control of air.
7. control method according to claim 6, which is characterized in that the predetermined coefficient K1、K2、K3、K4According to heating furnace
Furnace type structure, technological parameter, control require to carry out adjusting adjusting.
8. control method according to claim 6, which is characterized in that gas flow, the air mass flow tune of the step S1
Section process is identical as step S4.
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| CN115650556A (en) * | 2022-10-25 | 2023-01-31 | 青岛融合新材料科技有限公司 | Temperature feedforward control system and control method for glass production kiln |
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| CN113739196A (en) * | 2021-08-30 | 2021-12-03 | 重庆赛迪热工环保工程技术有限公司 | Air-fuel ratio value control system for fuel flow and air flow of heating boiler temperature |
| CN113739196B (en) * | 2021-08-30 | 2023-10-10 | 重庆赛迪热工环保工程技术有限公司 | Heating boiler furnace temperature fuel flow and air flow air-fuel ratio control system |
| CN115650556A (en) * | 2022-10-25 | 2023-01-31 | 青岛融合新材料科技有限公司 | Temperature feedforward control system and control method for glass production kiln |
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