CN107238100B - Kiln burning control method and system - Google Patents
Kiln burning control method and system Download PDFInfo
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- CN107238100B CN107238100B CN201710530505.2A CN201710530505A CN107238100B CN 107238100 B CN107238100 B CN 107238100B CN 201710530505 A CN201710530505 A CN 201710530505A CN 107238100 B CN107238100 B CN 107238100B
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- stove
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
- F23N1/025—Regulating fuel supply conjointly with air supply using electrical or electromechanical means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2239/00—Fuels
- F23N2239/04—Gaseous fuels
Abstract
The invention discloses a kind of kiln burning control method and systems, are related to kiln burning industry technology field.The system comprises gas flow instrument, gas flow regulating valve, combustion air flow instrument, combustion-supporting air flow control valve, gas calorific value apparatus and control systems, gas calorific value apparatus is used to measure the practical calorific value of gas in stove, gas flow instrument is for measuring gas flow actual value in the stove, gas flow regulating valve is used to adjust the gas flow in the stove, combustion air flow instrument is used to adjust the combustion-supporting wind flow in the stove for measuring combustion-supporting wind flow actual value in the stove, combustion-supporting air flow control valve.After by adopting the above technical scheme, traditional temperature control mode can be changed to flow control mode, overcome temperature lag big, drawback not easy to control, kiln burning control is set to become simply to be easily achieved, gas saving is achieved the purpose that, improve kiln burning temperature or has stablized kiln burning temperature, has made being optimal of Combustion System.
Description
Technical field
The present invention relates to kiln burning industry technology fields, more particularly to a kind of kiln burning control method and system.
Background technique
Kiln burning control problem is always global problem, the external generally complexity based on material balance and energy balance
Mathematical model, and China's basic ideas are using advanced control theory technology as the method for realizing control, temperature is using double
The control of the methods of cross limiting range.
Since control thought, method and mathematical model are complicated, enforcement difficulty is big, it is harsh and serious inclined to require field condition
From reasons such as on-site actual situations, it is difficult that burning operation is made to reach best, Combustion System relies on operator's experience manual substantially
Operation causes stove gas consumption to increase, temperature parameter control since calorific value of gas fluctuates larger, operator's bad control manually
Make it is bad, burn it is insufficient increase hazardous emission, pollute and environment and waste natural resources.
Summary of the invention
The technical problem to be solved by the present invention is in view of the above shortcomings of the prior art, provide a kind of kiln burning controlling party
Method and system solve the control problem of traditional kiln burning, make kiln burning control become simply to be easily achieved, have reached section
About coal gas, raising kiln burning temperature or the purpose for stablizing kiln burning temperature, make being optimal of Combustion System.
The embodiment of the present invention in a first aspect, providing a kind of kiln burning control method, comprising the following steps:
Practical coal in the stove measured according to the corresponding relationship of the calorific value of gas and air-fuel ratio prestored and gas calorific value apparatus
Gas calorific value determines the actual air-fuel ratio in the stove；
Using the gas flow setting value curve and the actual air-fuel ratio prestored, determine that combustion air flow setting value is bent
Line；
The gas flow setting value of object time is determined according to the gas flow setting value curve, and according to gas flow
Gas flow actual value in stove described in object time described in instrument measurement；
According to the gas flow setting value and the gas flow actual value, controls gas flow and adjust described in valve regulation
Gas flow in stove；
Determine the combustion air flow setting value of the object time according to the combustion air flow setting value curve, and according to
Combustion air flow instrument measures combustion-supporting wind flow actual value in stove described in the object time；
According to the combustion air flow setting value and the combustion-supporting wind flow actual value, combustion-supporting air flow control valve tune is controlled
Save the combustion-supporting wind flow in the stove.
As further technical solution, the determining combustion air flow setting value curve includes:
Respectively by each gas flow setting value and the actual air-fuel ratio phase in the gas flow setting value curve
Multiply, obtains the combustion air flow setting value curve.
As further technical solution, the control gas flow adjusts the gas flow packet in stove described in valve regulation
It includes:
Calculate the gas flow difference of the gas flow setting value Yu the gas flow actual value；
When the absolute value of the gas flow difference is more than default gas flow difference threshold, according to the gas flow
Difference controls the gas flow in stove described in the gas flow adjusting valve regulation.
As further technical solution, the combustion-supporting air flow control valve of control adjusts combustion-supporting distinguished and admirable in the stove
Amount includes:
Calculate the combustion air flow difference of the combustion air flow setting value Yu the combustion-supporting wind flow actual value；
When the absolute value of the combustion air flow difference is more than default combustion air flow difference threshold value, according to described combustion-supporting
Wind flow difference controls the combustion-supporting air flow control valve and adjusts combustion-supporting wind flow in the stove.
As further technical solution, it includes blast furnace gas, coal gas of converter, mixed gas that the furnace, which stores interior kinds of gas,
And coke-stove gas.
As further technical solution, the gas flow instrument and combustion air flow instrument be standard throttle apparatus or
The gas flow instrument and combustion air flow instrument are inserting-type flowmeter.
As further technical solution, the gas flow regulating valve and combustion-supporting air flow control valve are pneumatic control valve
Or the gas flow regulating valve and combustion-supporting air flow control valve are electric control valve.
The second aspect of the embodiment of the present invention provides system used in a kind of kiln burning control method, gas flow
Instrument, gas flow regulating valve, combustion air flow instrument, combustion-supporting air flow control valve, gas calorific value apparatus and control system；
The gas calorific value apparatus, for measuring the practical calorific value of gas in stove；
The gas flow instrument, for measuring gas flow actual value in stove described in the object time；
The gas flow regulating valve, for adjusting the gas flow in the stove；
The combustion air flow instrument, for measuring combustion-supporting wind flow actual value in stove described in the object time；
The combustion-supporting air flow control valve, for adjusting the combustion-supporting wind flow in the stove；
The control system, for the corresponding relationship and gas calorific value apparatus according to the calorific value of gas prestored and air-fuel ratio
Practical calorific value of gas in the stove of measurement, determines the actual air-fuel ratio in the stove；Utilize the gas flow setting value prestored
Curve and the actual air-fuel ratio determine combustion air flow setting value curve；It is determined according to the gas flow setting value curve
The gas flow setting value of object time, and gas flow in stove described in the object time according to gas flow instrument measurement
Actual value；According to the gas flow setting value and the gas flow actual value, controls gas flow and adjust described in valve regulation
Gas flow in stove；The combustion air flow set of the object time is determined according to the combustion air flow setting value curve
Value, and combustion-supporting wind flow actual value in the stove according to the combustion air flow instrument measurement object time；It is helped according to described
Fire wind flow setting value and the combustion-supporting wind flow actual value, control combustion-supporting air flow control valve adjust it is combustion-supporting in the stove
Wind flow.
As further technical solution, the control system includes PLC control system or DCS control system.
The beneficial effects of adopting the technical scheme are that the present invention is by providing a kind of kiln burning controlling party
Traditional temperature control mode is changed to flow control mode, temperature lag can be overcome big by method and system, uppity disadvantage
End, while the relationship of a kind of air-fuel ratio and calorific value is invented, change actual air-fuel ratio in real time with calorific value, makes at kiln burning process
In Automatic Control state, be truly realized the air of stove and coal gas automatic mixing and realize best combustion, that is, save from
Right resource, and reduce the discharge of harmful substance, protect environment.
Detailed description of the invention
Fig. 1 is a kind of step schematic diagram for kiln burning control method that the embodiment of the present invention one provides；
Fig. 2 is the coordinate schematic diagram of gas flow setting curve in one embodiment of the invention；
Fig. 3 is the instance graph of gas flow setting curve in one embodiment of the invention；
Fig. 4 is a kind of module diagram for kiln burning control system that the embodiment of the present invention three provides；
Fig. 5 is a kind of module diagram for kiln burning control system that the embodiment of the present invention four provides.
In figure: 1, gas flow instrument；2, gas flow regulating valve；3, combustion air flow instrument；4, combustion-supporting wind flow tune
Save valve；5, gas flow sets curve generation unit；6, combustion air flow set curve generation unit；7, air-fuel ratio calculates single
Member；8, control unit；9, control system；10, gas calorific value apparatus.
Specific embodiment
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Embodiment one
As shown in Figure 1, for a kind of step schematic diagram of kiln burning control method of the present invention, comprising:
In S101, according to the corresponding relationship of the calorific value of gas and air-fuel ratio prestored and the furnace of gas calorific value apparatus measurement
Practical calorific value of gas in kiln, determines the actual air-fuel ratio in the stove.
Specifically, range of the kinds of gas according to calorific value of gas, is divided into blast furnace gas, coal gas of converter, mixed gas and coke
Producer gas, control system 9 calculate the air-fuel ratio of various coal gas according to calorific value of gas numerical value, test corresponding to the various coal gas of acquisition
Air-fuel ratio β n it is as shown in table 1:
Air-fuel ratio β n corresponding to the various coal gas of table 1
| Kinds of gas | Blast furnace gas | Coal gas of converter | Mixed gas | Coke-stove gas |
| Calorific value of gas Q range (kcal/m3) | 500~1049 | 1050~1799 | 1800~3799 | 3800~4300 |
| Chemically correct fuel β0 | 0.794Q/1000 | 0.836Q/1000+0.03 | 1.087Q/1000 | 1.087Q/1000-0.25 |
| Coefficient of excess air μ | 1.05 | 1.05 | 1.05 | 1.05 |
| Actual air-fuel ratio βnCalculation formula | 0.834Q/1000 | 0.878Q/1000+0.032 | 1.141Q/1000 | 1.141Q/1000-0.263 |
| Actual air-fuel ratio βnMeasurement range | 0.417~0.875 | 0.954~1.612 | 2.054~4.335 | 4.073~4.643 |
In table: β 0--- chemically correct fuel;β n--- actual air-fuel ratio;Q--- calorific value of gas, kcal/m3.
1 content of table is stored in control system 9, according to gas calorific value apparatus 10 measure real-time calorific value of gas numerical value, according to
According to thermal value range, control system 9 automatically selects kinds of gas and air-fuel ratio calculation formula, calculates the reality of kiln burning automatically
Air-fuel ratio β n, according to real-time calorific value of gas numerical classification, different kindss of gas corresponds to different actual air-fuel ratios and calculates public affairs
Formula, is conducive to accurately determine actual air-fuel ratio, provides accurate guarantee for system regulation.
In S102, using the gas flow setting value curve and the actual air-fuel ratio prestored, combustion-supporting wind flow is determined
Setting value curve.
The generation method of the combustion air flow setting value curve are as follows: utilize the Gas Flow in gas flow setting value curve
Amount setting value is multiplied with actual air-fuel ratio β n, obtains the corresponding combustion air flow setting value curve of each section of curve.
Combustion air flow set curve is completed in control system 9, generates the target value of combustion air flow control.
It is divided by alternatively, it is also possible to generate combustion air flow setting value curve with actual air-fuel ratio β n, obtains each section of curve pair
The gas flow setting value answered.
In S103, the gas flow setting value of object time, and root are determined according to the gas flow setting value curve
According to gas flow actual value in stove described in the object time described in gas flow instrument measurement.
Specifically, gas flow setting curve is completed in control system 9, gas flow sets curve as gas flow
The target value of control.
As shown in Fig. 2, the coordinate schematic diagram of gas flow setting curve of the present invention, gas flow setting value curvilinear coordinate are shown
It is intended to include two parameters of break and time numerical value, break is abscissa, and time parameter is ordinate, and break number can be voluntarily
Setting, 1-10 can set, time numerical value (unit: h): the 1st break t1,0-24h can set, the 2nd break t2, and 0-24h can
With setting, the 3rd break t3,0-24h can be set, the 4th break t4, and 0-24h can be set ..., and the 10th break t10,0-24h can
With setting；Corresponding gas flow setting value (unit: Nm3/h): the 1st break FG1,0-FGMAX can set, the 2nd break
FG2,0-FGMAX can set, the 3rd break FG3, and 0-FGMAX can set, the 4th break FG4, and 0-FGMAX can be set ...
10th break FG10,0-FGMAX can be set；It can produce 10 sections of 0A-AB-BC-CD-DE-EF-FG-GH-HI-IJ in this way
Gas flow setting value curve, in which: FGMAX is the maximum value of gas flow, can generate the target of gas flow control in advance
Value provides true scope for adjustment later and provides standard.
In S104, according to the gas flow setting value and the gas flow actual value, controls gas flow and adjust
Valve 2 adjusts the gas flow in the stove.
Specifically, gas flow control, using the pid control algorithm in control system 9, gas flow sets curve conduct
The setting value of control system 9, the gas flow that gas flow instrument 1 measures, the measured value of control system 9, setting value and measurement
The difference of value controls gas flow regulating valve 2, calculates the coal through pid control algorithm operation, the output electric signal of control system 9
The gas flow difference of throughput setting value and the gas flow actual value, when the absolute value of the gas flow difference is more than
When default gas flow difference threshold, the gas flow regulating valve 2 is controlled according to the gas flow difference and adjusts the furnace
Gas flow in kiln；When the absolute value of the gas flow difference is less than or equal to default gas flow difference threshold, temporarily
Uncomfortable air-flow adjustable valve 2 of economizing on coal.
In S105, the combustion air flow set of the object time is determined according to the combustion air flow setting value curve
Value, and combustion-supporting wind flow actual value in the stove according to the combustion air flow instrument measurement object time.
Specifically, combustion air flow setting value curve is completed in control system 9, that is, the mesh of combustion air flow control
Scale value.
In S106, according to the combustion air flow setting value and the combustion-supporting wind flow actual value, control combustion-supporting distinguished and admirable
Adjustable valve adjusts the combustion-supporting wind flow in the stove.
Control system 9 measures combustion-supporting distinguished and admirable according to the setting value and combustion air flow instrument of combustion air flow set curve
Amount through pid control algorithm operation, control combustion-supporting air flow control valve 3, calculate the combustion air flow setting value with it is described combustion-supporting
The combustion air flow difference of wind flow actual value；When the absolute value of the combustion air flow difference is more than default combustion air difference in flow
When being worth threshold value, the combustion-supporting air flow control valve is controlled according to the combustion air flow difference and adjusts combustion air in the stove
Flow；When the absolute value of the combustion air flow difference is less than or equal to default combustion air flow difference threshold value, wouldn't adjust
Combustion-supporting air flow control valve 3.
There is the relationship of the actual air-fuel ratio by calorific value of gas variation in combustion air flow setting value and gas flow setting value,
In this way, control unit 8 is also just controlled actual gas flow and combustion-supporting wind flow by actual air-fuel ratio, it is all to ensure that
The optimization of Combustion System has accomplished the completely burned of coal gas, realizes the optimized control of stove, reached energy conservation, temperature raising,
The purpose of steady temperature.
Gas flow instrument 1 and combustion air flow instrument 3 are standard throttle apparatus or inserting-type flowmeter；Gas flow tune
Valve 2 and combustion-supporting air flow control valve 4 are saved as pneumatically or electrically regulating valve；Control system 9 includes that PLC control system or DCS are controlled
System.
Specifically, gas flow instrument 1 is that annular oriffice matches differential pressure transmitter, orifice plate model LGH, differential pressure transmitter is
EJA110A.Gas flow regulating valve 2 is ZKJW-0.6S type motorized adjustment butterfly valve.Combustion air flow instrument 3 is standard throttling dress
It sets with differential pressure transmitter, orifice plate model LGB, differential pressure transmitter EJA110A.Combustion-supporting air flow control valve 4 is ZKJW-0.6S
Type motorized adjustment butterfly valve.Gas calorific value apparatus 10 is Germany's SMART2006 series caloric value instrument.PLC or DCS control system 9 is west gate
Sub- S7-300PLC system.
The present embodiment calculates the actual air-fuel ratio changed with calorific value using gas calorific value apparatus, is set using gas flow bent
The Complex Temperature control of traditional kiln burning is reduced to two by actual air-fuel ratio by line and combustion air flow set curve
Single loop flow control is the huge innovation of Combustion System, solves the control problem of traditional kiln burning, make kiln burning control
System becomes simply to be easily achieved, and has achieved the purpose that gas saving, improves kiln burning temperature or has stablized kiln burning temperature, has made
Being optimal of Combustion System.
Embodiment two
By stove by taking blast furnace and hot blast cupola combustion controls as an example.
Certain blast funnace hot blast stove, gas flow 0-84000Nm3/h, combustion-supporting wind flow 0-52000Nm3/h, what caloric value instrument was shown
The kcal/m3 of calorific value Q=710, Combustion of Hot Air Furnace control method are as follows:
According to the real-time calorific value of gas numerical value that gas calorific value apparatus 10 measures, control system 9 automatically selects kinds of gas and sky
Combustion calculates the actual air-fuel ratio β n of kiln burning than calculation formula.
According to the kcal/m3 of numerical value Q=710 of table 1 and gas calorific value apparatus 10, coal gas is blast furnace gas, actual air-fuel ratio β n=
0.834Q/1000=0.834*710/1000=0.592。
Gas flow setting value curve, that is, the target value of gas flow control are generated in control system 9.
As shown in figure 3, completing gas flow in control system 9 sets curve, input break number is 10, input time
Be worth (unit: min): the 1st break t1=1, the 2nd break t2=5, the 3rd break t3=20, the 4th break t4=50, the 5th break t5=70,
6th break t6=80, the 7th break t7=90, the 8th break t8=100, the 9th break t9=110, the 10th break t10=120；It is corresponding
Gas flow setting value (unit: Nm3/h): the 1st break FG1=20000, the 2nd break FG2=30000, the 3rd break FG3=
80000, the 4th break FG4=80000, the 5th break FG5=60000, the 6th break FG6=60000, the 7th break FG7=50000, the 8th
Break FG8=40000, the 9th break FG9=30000, the 10th break FG10=30000；It can produce 0A-AB-BC-CD-DE- in this way
10 sections of gas flow setting value curves of EF-FG-GH-HI-IJ.
Combustion air flow setting value curve, that is, the target value of combustion air flow control are generated in control system 9.
Gas flow setting value curve is multiplied with n=0.592 actual air-fuel ratio β, and it is corresponding combustion-supporting distinguished and admirable to obtain each section of curve
Measure setting value curve.
The survey for the gas flow that control system 9 sets the setting value of curve according to gas flow and gas flow instrument measures
Magnitude controls gas flow regulating valve through pid control algorithm operation, when the absolute value of the gas flow difference is more than default coal
When throughput difference threshold, the gas flow regulating valve 2 is controlled according to the gas flow difference and is adjusted in the stove
Gas flow；When the absolute value of the gas flow difference is less than or equal to default gas flow difference threshold, wouldn't adjust
Gas flow regulating valve 2.
Control system 9 measures combustion-supporting distinguished and admirable according to the setting value and combustion air flow instrument of combustion air flow set curve
Amount controls combustion-supporting air flow control valve through pid control algorithm operation, controls the combustion air according to the combustion air flow difference
Flow control valve adjusts the combustion-supporting wind flow in the stove；When the absolute value of the combustion air flow difference is less than or equal in advance
If when combustion air flow difference threshold value, combustion-supporting air flow control valve 3 wouldn't be adjusted.
Control system 9 is set gas flow shown in Fig. 3 bent using the pid control algorithm in Siemens S7-300 PLC
Setting value of the line as pid algorithm, the gas flow that gas flow instrument 1 measures, as the measured value of pid algorithm, setting value
Through pid control algorithm operation, the output electric signal of control system 9 controls gas flow regulating valve 2, makes reality difference with measured value
The gas flow on border is controlled respectively on gas flow setting curve shown in Fig. 3, and wherein pid parameter is proportional band P=0.45,
Time of integration Ti=5min.
Combustion air flow control also uses the pid control algorithm in Siemens S7-300 PLC, combustion air flow set curve
As the setting value of pid algorithm, the combustion-supporting wind flow that combustion air flow instrument 3 measures, as the measured value of pid algorithm, setting
Through pid control algorithm operation, the output electric signal of control system 9 controls combustion-supporting air flow control valve 4 for value and the difference of measured value,
Control actual combustion-supporting wind flow respectively in the combustion air flow set generated of combustion air flow set curve generation unit 6
In value, wherein pid parameter is proportional band P=0.42, time of integration Ti=4.5min.
Actual motion shows: the embodiment can make gas flow and air flow control in ± (100-200) Nm3/h model
In enclosing, corresponding precision can achieve 0.2-0.5%, so that kiln burning process is in Automatic Control state, is truly realized stove
Air and coal gas automatic mixing and realize best combustion, that is, save natural resources, and reduce the discharge of harmful substance, protect
Environment is protected.
Embodiment three
As shown in figure 4, the module diagram of the embodiment of system used in a kind of kiln burning control method of the present invention, packet
It includes:
Gas flow instrument 1, gas flow regulating valve 2, combustion air flow instrument 3, combustion-supporting air flow control valve 4, coal gas
Caloric value instrument 10 and control system 9.
The gas calorific value apparatus 10, for measuring the practical calorific value of gas in stove.
The gas flow instrument 1, for measuring gas flow actual value in the stove.
The gas flow regulating valve 2, for adjusting the gas flow in the stove.
The combustion air flow instrument 3, for measuring combustion-supporting wind flow actual value in the stove.
The combustion-supporting air flow control valve 4, for adjusting the combustion-supporting wind flow in the stove.
The control system 9, for the corresponding relationship and gas calorific value apparatus according to the calorific value of gas prestored and air-fuel ratio
Practical calorific value of gas in the stove of 10 measurements, determines the actual air-fuel ratio in the stove；It is set using the gas flow prestored
It is worth curve and the actual air-fuel ratio, determines combustion air flow setting value curve；It is true according to the gas flow setting value curve
Set the goal the gas flow setting value of time, and according to gas flow instrument 1 measure the object time described in coal gas in stove
Flow actual value；According to the gas flow setting value and the gas flow actual value, controls gas flow regulating valve 2 and adjust
Gas flow in the stove；The combustion-supporting wind flow of the object time is determined according to the combustion air flow setting value curve
Setting value, and according to combustion air flow instrument 3 measure the object time described in combustion-supporting wind flow actual value in stove；According to institute
Combustion air flow setting value and the combustion-supporting wind flow actual value are stated, combustion-supporting air flow control valve 4 is controlled and adjusts in the stove
Combustion-supporting wind flow.
Control system 9 includes PLC control system or DCS control system.
Gas calorific value apparatus 10 is Germany's SMART2006 series caloric value instrument.
The gas flow regulating valve 2 is ZKJW-0.6S type motorized adjustment butterfly valve.
Example IV
Control system 9 includes gas flow setting curve generation unit 5, combustion air flow set curve generation unit 6, sky
Combustion is than computing unit 7 and control unit 8, as shown in figure 5, system used in a kind of kiln burning control method of the present invention is another
The module diagram of a embodiment, including it is gas flow instrument 1, gas flow regulating valve 2, combustion air flow instrument 3, combustion-supporting
Air flow control valve 4, gas calorific value apparatus 10 and control system 9, gas flow instrument 1 and gas flow regulating valve 2 are mounted on furnace
On the entrance of kiln gas piping, combustion air flow instrument 3 and combustion-supporting air flow control valve 4 are mounted on entering for the combustion-supporting air piping of stove
On mouth, control system 9 includes that gas flow sets curve generation unit 5, combustion air flow set curve generation unit 6, air-fuel
Than computing unit 7 and control unit 8, the output end of gas flow setting curve generation unit 5 is connect with control unit 8, combustion-supporting
The output end of wind flow setting curve generation unit 6 is connect with control unit 8, the input terminal and coal gas of air-fuel ratio computing unit 7
The output end of caloric value instrument 10 connects, and the output end of air-fuel ratio computing unit 7 is connect with automatic control unit 8, automatic control unit 8
Input terminal respectively with gas flow instrument 1, combustion air flow instrument 3, gas regulator 2, combustion air regulating valve 3 output end
Connection, the output end of automatic control unit 8 are connect with gas flow regulating valve 2 and combustion-supporting air flow control valve 4 respectively, will be respective
Flow control setting curve flow setting value on.
Control system 9 includes PLC control system or DCS control system.
Control unit 8 is completed in PLC or DCS control system 9, and the input of control unit 8 and gas flow setting curve are raw
At unit 5, combustion air flow set curve generation unit 6 and air-fuel ratio computing unit 7 connect, the input of control unit 8 also with
The output connection of gas flow instrument 1, combustion air flow instrument 3, gas regulator 2, combustion air regulating valve 4, control unit 8
Output is connect with gas flow regulating valve 2 and combustion-supporting air flow control valve 4 respectively, by respective flow control in setting curve
On flow setting value.
Control unit 8 is divided for gas flow control and combustion air flow control.Gas flow control is controlled using PLC or DCS
Pid control algorithm in system 9 processed, gas flow setting curve generation unit 5 are connect with control unit 8, gas flow setting
Setting value of the curve as control unit 8, the gas flow that gas flow instrument 1 measures, the measured value as control unit 8；
Through pid control algorithm operation, the output electric signal of control unit 8 controls gas flow regulating valve for setting value and the difference of measured value
2, it controls actual gas flow respectively and sets the gas flow setting value generated of curve generation unit 5 in gas flow
On.
Combustion air flow control also uses the pid control algorithm in PLC or DCS control system 9, and combustion air flow set is bent
Line generation unit 6 is connect with control unit 8, setting value of the combustion air flow set curve as control unit 8, combustion-supporting wind flow
The combustion-supporting wind flow that instrument 2 measures, the measured value as control unit 8；Setting value and the difference of measured value are through pid control algorithm
The output electric signal of operation, control unit 8 controls combustion-supporting air flow control valve 4, controls actual combustion-supporting wind flow respectively
On the combustion air flow setting value generated of combustion air flow set curve generation unit 6.
There is the relationship of the actual air-fuel ratio by calorific value of gas variation in combustion air flow setting value and gas flow setting value,
Control unit 8 is also just controlled actual gas flow and combustion-supporting wind flow by actual air-fuel ratio, all to ensure that burning
The optimization of control has accomplished the completely burned of coal gas, realizes the optimized control of stove, has reached energy conservation, temperature raising, steady temperature
Purpose.
After adopting the above technical scheme, flow control mode can be changed to traditional temperature control mode, overcome temperature stagnant
Big afterwards, not easy to control drawback, while the actual air-fuel ratio changed with calorific value is calculated using gas calorific value apparatus, utilize Gas Flow
The Complex Temperature control of traditional kiln burning is reduced to by practical air-fuel by amount setting curve and combustion air flow set curve
Two single loop flow controls of ratio are the huge innovations of Combustion System, solve the control problem of traditional kiln burning, make furnace
Kiln Combustion System becomes simply to be easily achieved, and has reached gas saving, improves kiln burning temperature or has stablized kiln burning temperature
Purpose, make being optimal of Combustion System.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (7)
1. a kind of kiln burning control method, which comprises the following steps:
Practical coal gas heat in the stove measured according to the corresponding relationship of the calorific value of gas and air-fuel ratio prestored and gas calorific value apparatus
Value, determines the actual air-fuel ratio in the stove；
Using the gas flow setting value curve and the actual air-fuel ratio prestored, combustion air flow setting value curve is determined；
The gas flow setting value of object time is determined according to the gas flow setting value curve, and according to gas flow instrument
Measure gas flow actual value in stove described in the object time；
According to the gas flow setting value and the gas flow actual value, controls gas flow and adjust stove described in valve regulation
Interior gas flow；
The combustion air flow setting value of the object time is determined according to the combustion air flow setting value curve, and according to combustion-supporting
Combustion-supporting wind flow actual value in stove described in object time described in wind flow instrument measurement；
According to the combustion air flow setting value and the combustion-supporting wind flow actual value, controls combustion-supporting air flow control valve and adjust institute
State the combustion-supporting wind flow in stove；
The determining combustion air flow setting value curve includes: respectively by each coal gas in the gas flow setting value curve
Flow setting value is multiplied with the actual air-fuel ratio, obtains the combustion air flow setting value curve；
The gas flow that the control gas flow is adjusted described in valve regulation in stove includes:
Calculate the gas flow difference of the gas flow setting value Yu the gas flow actual value；
When the absolute value of the gas flow difference is more than default gas flow difference threshold, according to the gas flow difference
Control the gas flow in stove described in the gas flow adjusting valve regulation.
2. a kind of kiln burning control method according to claim 1, which is characterized in that the combustion-supporting wind flow tune of control
Combustion-supporting wind flow described in section valve regulation in stove includes:
Calculate the combustion air flow difference of the combustion air flow setting value Yu the combustion-supporting wind flow actual value；
When the absolute value of the combustion air flow difference is more than default combustion air flow difference threshold value, according to described combustion-supporting distinguished and admirable
Amount difference controls the combustion-supporting air flow control valve and adjusts combustion-supporting wind flow in the stove.
3. a kind of kiln burning control method according to claim 1, which is characterized in that the coal gas kind in the stove
Class includes blast furnace gas, coal gas of converter, mixed gas and coke-stove gas.
4. a kind of kiln burning control method according to claim 1, which is characterized in that the gas flow instrument and help
Combustion wind flow instrument is standard throttle apparatus or the gas flow instrument and combustion air flow instrument is inserting-type flowmeter.
5. a kind of kiln burning control method according to claim 1, which is characterized in that the gas flow regulating valve and
Combustion-supporting air flow control valve is pneumatic control valve or the gas flow regulating valve and combustion-supporting air flow control valve is motorized adjustment
Valve.
6. a kind of kiln burning based on a kind of kiln burning control method described in claim 1-5 any one controls system
System characterized by comprising
Gas flow instrument (1), gas flow regulating valve (2), combustion air flow instrument (3), combustion-supporting air flow control valve (4),
Gas calorific value apparatus (10) and control system (9)；
The gas calorific value apparatus (10), for measuring the practical calorific value of gas in stove；
The gas flow instrument (1), for measuring gas flow actual value in stove described in the object time；
The gas flow regulating valve (2), for adjusting the gas flow in the stove；
The combustion air flow instrument (3), for measuring combustion-supporting wind flow actual value in stove described in the object time；
The combustion-supporting air flow control valve (4), for adjusting the combustion-supporting wind flow in the stove；
The control system (9), for the corresponding relationship and gas calorific value apparatus according to the calorific value of gas prestored and air-fuel ratio
(10) practical calorific value of gas in the stove measured, determines the actual air-fuel ratio in the stove；It is set using the gas flow prestored
The settled value curve and the actual air-fuel ratio determine combustion air flow setting value curve；According to the gas flow setting value curve
Determine the gas flow setting value of object time, and in the stove according to gas flow instrument (1) measurement object time
Gas flow actual value；According to the gas flow setting value and the gas flow actual value, gas flow regulating valve is controlled
(2) gas flow in the stove is adjusted；Helping for the object time is determined according to the combustion air flow setting value curve
Wind flow setting value is fired, and combustion-supporting wind flow is real in the stove according to combustion air flow instrument (3) measurement object time
Actual value；According to the combustion air flow setting value and the combustion-supporting wind flow actual value, combustion-supporting air flow control valve (4) tune is controlled
Save the combustion-supporting wind flow in the stove.
7. a kind of kiln burning control system according to claim 6, which is characterized in that the control system (9) includes
PLC control system or DCS control system.
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| CN108458486A (en) * | 2018-04-13 | 2018-08-28 | 安徽工业大学 | A kind of Combustion of Hot Air Furnace automatic control system and its control method |
| CN108870997B (en) * | 2018-06-27 | 2019-11-05 | 深圳市天圳自动化技术有限公司 | A kind of quantitative heat supply method |
| CN110397934B (en) * | 2019-08-12 | 2021-06-08 | 苏伊士水务工程有限责任公司 | Automatic temperature rise control method and device for incinerator |
| CN111854459B (en) * | 2020-08-05 | 2021-07-02 | 广西柳州钢铁集团有限公司 | Accurate control method for furnace gas temperature of heating furnace |
| 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 |
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