CN107238100A - Kiln burning control method and system - Google Patents
Kiln burning control method and system Download PDFInfo
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- CN107238100A CN107238100A CN201710530505.2A CN201710530505A CN107238100A CN 107238100 A CN107238100 A CN 107238100A CN 201710530505 A CN201710530505 A CN 201710530505A CN 107238100 A CN107238100 A CN 107238100A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000002485 combustion reaction Methods 0.000 claims abstract description 109
- 230000001105 regulatory effect Effects 0.000 claims abstract description 31
- 239000000446 fuel Substances 0.000 claims description 23
- 239000003034 coal gas Substances 0.000 claims description 17
- 238000005259 measurement Methods 0.000 claims description 12
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 8
- 239000003245 coal Substances 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The invention discloses a kind of kiln burning control method and system, it is related to kiln burning industry technology field.The system includes gas flow instrument, gas flow regulating valve, combustion air flow instrument, combustion-supporting air flow control valve, gas calorific value apparatus and control system, gas calorific value apparatus is used to measure the actual calorific value of gas in stove, gas flow instrument is used to measure 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 measure combustion-supporting wind flow actual value in the stove, and combustion-supporting air flow control valve is used to adjust the combustion-supporting wind flow in the stove.After above-mentioned technical proposal, traditional temperature control mode can be changed to flow control mode, overcome temperature lag big, whard to control the drawbacks of, kiln burning control is set to become simply to be easily achieved, gas saving reached, improved kiln burning temperature or the purpose of stable kiln burning temperature, made being optimal of Combustion System.
Description
Technical field
The present invention relates to kiln burning industry technology field, more particularly to a kind of kiln burning control method and system.
Background technology
Kiln burning control problem is always global problem, the external generally complexity based on material balance and energy balance
Mathematical modeling, and China's basic ideas are that, as the method for realizing control, temperature is using double using advanced control theory technology
The methods such as cross limiting range are controlled.
Because control thought, method and mathematical modeling are complicated, enforcement difficulty is big, it is harsh and serious inclined that field condition is required
From reasons such as on-site actual situations, it is difficult to which it is optimal to reach burning operation, Combustion System relies on operating personnel's experience manual substantially
Operation, because calorific value of gas fluctuates larger, operator's bad control manually, causes stove gas consumption to increase, temperature parameter control
System is not good, and burning is insufficient to increase hazardous emission, pollutes environment and wastes natural resources.
The content of the invention
The technical problem to be solved in the present invention is that there is provided a kind of kiln burning controlling party for above-mentioned the deficiencies in the prior art
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 the purpose of coal gas, raising kiln burning temperature or stable kiln burning temperature, makes being optimal of Combustion System.
The first aspect of the embodiment of the present invention comprises the following steps there is provided a kind of kiln burning control method：
According to actual coal gas heat in the calorific value of gas and the corresponding relation of air-fuel ratio prestored, and the stove of gas calorific value apparatus measurement
Value, determines the actual mixing ratio in the stove；
Using the gas flow setting value curve and the actual mixing 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 described in the object time gas flow actual value in stove；
According to the gas flow setting value and the gas flow actual value, stove described in control gas flow regulation 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, combustion-supporting air flow control valve regulation institute is controlled
State the combustion-supporting wind flow in stove.
As further technical scheme, the determination combustion air flow setting value curve includes：
Each gas flow setting value in the gas flow setting value curve is multiplied with the actual mixing ratio respectively, obtained
To the combustion air flow setting value curve.
As further technical scheme, the gas flow bag described in the control gas flow regulation valve regulation in stove
Include：
Calculate the gas flow difference of the gas flow setting value and the gas flow actual value；
When the absolute value of the gas flow difference exceedes default gas flow difference threshold, according to the gas flow difference
Control the gas flow in stove described in the gas flow regulation valve regulation.
As further technical scheme, 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 and the combustion-supporting wind flow actual value；
When the absolute value of the combustion air flow difference exceedes default combustion air flow difference threshold value, according to described combustion-supporting distinguished and admirable
Measure the combustion-supporting wind flow in the difference control combustion-supporting air flow control valve regulation stove.
As further technical scheme, kinds of gas includes blast furnace gas, coal gas of converter, mixed gas in the stove cellar for storing things
And coke-stove gas.
As further technical scheme, 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 scheme, 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.
There is provided the system used in a kind of kiln burning control method, gas flow for the second aspect of the embodiment of the present invention
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 actual calorific value of gas in stove；
The gas flow instrument, for measuring described in the object time gas flow actual value in stove；
The gas flow regulating valve, for adjusting the gas flow in the stove；
The combustion air flow instrument, for measuring described in the object time combustion-supporting wind flow actual value in stove；
The combustion-supporting air flow control valve, for adjusting the combustion-supporting wind flow in the stove；
The control system, for according to the calorific value of gas and the corresponding relation of air-fuel ratio prestored, and gas calorific value apparatus measurement
Stove in actual calorific value of gas, determine the actual mixing ratio in the stove；Utilize the gas flow setting value curve prestored
With the actual mixing ratio, combustion air flow setting value curve is determined；Target is determined according to the gas flow setting value curve
The gas flow setting value of time, and gas flow is actual in stove described in the object time according to gas flow instrument measurement
Value；According to the gas flow setting value and the gas flow actual value, stove described in control gas flow regulation 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 air flow instrument measures object time combustion-supporting wind flow actual value in stove；According to the combustion air
Flow setting value and the combustion-supporting wind flow actual value, control combustion-supporting air flow control valve to adjust combustion-supporting distinguished and admirable in the stove
Amount.
As further technical scheme, the control system includes PLC control system or DCS control systems.
It is using the beneficial effect produced by above-mentioned technical proposal：The present invention is by providing a kind of kiln burning controlling party
Method and system, flow control mode is changed to by traditional temperature control mode, temperature lag can be overcome big, uppity disadvantage
End, while inventing a kind of air-fuel ratio and the relation of calorific value, makes actual mixing ratio change in real time with calorific value, makes at kiln burning process
In Automatic Control state, it is truly realized the air and coal gas automatic mixing of stove and realizes best combustion, that is, save certainly
Right resource, reduces the discharge of harmful substance, protects environment again.
Brief description of the drawings
Fig. 1 is a kind of step schematic diagram for kiln burning control method that the embodiment of the present invention one is provided；
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 is provided；
Fig. 5 is a kind of module diagram for kiln burning control system that the embodiment of the present invention four is provided.
In figure：1st, gas flow instrument；2nd, gas flow regulating valve；3rd, combustion air flow instrument；4th, combustion-supporting wind flow is adjusted
Save valve；5th, gas flow setting curve generation unit；6th, combustion air flow set curve generation unit；7th, air-fuel ratio calculates single
Member；8th, control unit；9th, control system；10th, gas calorific value apparatus.
Embodiment
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Embodiment one
As shown in figure 1, be a kind of step schematic diagram of kiln burning control method of the invention, including：
In S101, according in the calorific value of gas and the corresponding relation of air-fuel ratio prestored, and the stove of gas calorific value apparatus measurement
Actual calorific value of gas, determines the actual mixing ratio in the stove.
Specifically, scope of the kinds of gas according to calorific value of gas, is divided into blast furnace gas, coal gas of converter, mixed gas and Jiao
Producer gas, control system 9 is tested corresponding to the various coal gas obtained according to the air-fuel ratio of the various coal gas of calorific value of gas numerical computations
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 scopes（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 mixing ratio βnCalculation formula | 0.834Q/1000 | 0.878Q/1000+0.032 | 1.141Q/1000 | 1.141Q/1000-0.263 |
| Actual mixing 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 fuels;β n--- actual mixing ratios;Q--- calorifics value of gas, kcal/m3.
The content of table 1 is stored in control system 9, the real-time calorific value of gas numerical value measured according to gas calorific value apparatus 10, according to
According to thermal value range, control system 9 automatically selects kinds of gas and air-fuel ratio calculation formula, and the reality of kiln burning is calculated automatically
Air-fuel ratio β n, according to real-time calorific value of gas numerical classification, the different actual mixing ratio of different kinds of gas correspondences calculates public
Formula, is conducive to the accurate air-fuel ratio for determining reality, and accurate guarantee is provided for system regulation.
In S102, using the gas flow setting value curve and the actual mixing ratio prestored, combustion-supporting wind flow is determined
Setting value curve.
The generation method of the combustion air flow setting value curve is：Utilize the Gas Flow in gas flow setting value curve
Amount setting value is multiplied with actual mixing 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, produces the desired value of combustion-supporting wind flow control.
It is divided by alternatively, it is also possible to produce combustion air flow setting value curve with actual mixing 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.
Completed specifically, gas flow sets curve in control system 9, gas flow setting curve is used as gas flow
The desired value of control.
As shown in Fig. 2 gas flow of the present invention sets the coordinate schematic diagram of curve, gas flow setting value curvilinear coordinate is shown
Intention includes two parameters of break and time numerical value, and break is abscissa, and time parameter is ordinate, and break number can be voluntarily
Set, 1-10 can be set, time numerical value（Unit：h）：1st break t1,0-24h can be 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
To set；Corresponding gas flow setting value（Unit：Nm3/h）：1st break FG1,0-FGMAX can be set, the 2nd break
FG2,0-FGMAX can be set, the 3rd break FG3, and 0-FGMAX can be set, the 4th break FG4, and 0-FGMAX can be set ...
10th break FG10,0-FGMAX can be set；10 sections of 0A-AB-BC-CD-DE-EF-FG-GH-HI-IJ can so be produced
Gas flow setting value curve, wherein：FGMAX is the maximum of gas flow, and the target of gas flow control can be generated in advance
Value, adjustment provides true scope and provides standard for after.
In S104, according to the gas flow setting value and the gas flow actual value, control gas flow regulation
Valve 2 adjusts the gas flow in the stove.
Specifically, gas flow control is using the pid control algorithm in control system 9, gas flow setting curve conduct
The setting value of control system 9, the gas flow that gas flow instrument 1 is measured, the measured value of control system 9, setting value and measurement
The difference of value calculates the coal through pid control algorithm computing, the output electric signal control gas flow regulating valve 2 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 exceedes
During default gas flow difference threshold, the gas flow regulating valve 2 is controlled to adjust the stove according to the gas flow difference
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 the combustion-supporting wind flow actual value in stove according to combustion air flow instrument measures object time.
Specifically, combustion air flow setting value curve is completed in control system 9, that is, the mesh that combustion-supporting wind flow is controlled
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 according to the setting value and combustion air flow instrument of combustion air flow set curve measure it is combustion-supporting distinguished and admirable
Amount controls combustion-supporting air flow control valve 3 through pid control algorithm computing, 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 exceedes default combustion air difference in flow
When being worth threshold value, the combustion-supporting air flow control valve is controlled to adjust the combustion air in the stove according to the combustion air flow difference
Flow；When the absolute value of the combustion air flow difference is less than or equal to default combustion air flow difference threshold value, it wouldn't adjust
Combustion-supporting air flow control valve 3.
There is the relation of the actual mixing ratio changed by calorific value of gas with gas flow setting value in combustion air flow setting value,
So, control unit 8 is also just controlled actual gas flow and combustion-supporting wind flow by actual mixing ratio, all to ensure that
The optimization of Combustion System, has accomplished the complete burning of coal gas, has realized 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 is adjusted
It is pneumatically or electrically regulating valve to save valve 2 and combustion-supporting air flow control valve 4；Control system 9 includes PLC control system or DCS is controlled
System.
Specifically, gas flow instrument 1, which is annular oriffice, matches somebody with somebody 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 valves.Combustion air flow instrument 3 is standard throttling dress
Put with differential pressure transmitter, orifice plate model LGB, differential pressure transmitter is EJA110A.Combustion-supporting air flow control valve 4 is ZKJW-0.6S
Type motorized adjustment butterfly valve.Gas calorific value apparatus 10 is the serial caloric value instruments of Germany SMART2006.PLC or DCS control systems 9 are west gate
Sub- S7-300PLC systems.
The present embodiment calculates the actual mixing ratio changed with calorific value using gas calorific value apparatus, sets bent using gas flow
Line and combustion air flow set curve, the Complex Temperature control of traditional kiln burning are reduced to two by actual mixing ratio
Single loop flow is controlled, and is the huge innovation of Combustion System, is solved the control problem of traditional kiln burning, make kiln burning control
System becomes simply to be easily achieved, and has reached gas saving, has improved kiln burning temperature or the purpose of stable kiln burning temperature, has made
Being optimal of Combustion System.
Embodiment two
By stove by taking blast furnace and hot blast cupola combustion control 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 is as follows：
The real-time calorific value of gas numerical value measured according to gas calorific value apparatus 10, control system 9 automatically selects kinds of gas and air-fuel ratio
Calculation formula, calculates the actual mixing ratio β n of kiln burning.
According to the kcal/m3 of the numerical value Q of table 1 and gas calorific value apparatus 10=710, coal gas is blast furnace gas, actual mixing ratio β n=
0.834Q/1000=0.834*710/1000=0.592。
The generation gas flow setting value curve in control system 9, that is, the desired value that gas flow is controlled.
As shown in figure 3, completing gas flow setting curve in control system 9, input break number is 10, input time
Value（Unit：min）：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）：1st break FG1=20000, the 2nd break FG2=30000, the 3rd break FG3=
80000th, 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；0A-AB-BC-CD-DE- can so be produced
EF-FG-GH-HI-IJ 10 sections of gas flow setting value curves.
Combustion air flow setting value curve, that is, the desired value that combustion-supporting wind flow is controlled are generated in control system 9.
Gas flow setting value curve is multiplied with actual mixing ratio β n=0.592, obtains each section of curve corresponding combustion-supporting distinguished and admirable
Measure setting value curve.
The survey for the gas flow that the setting value and gas flow instrument that control system 9 sets curve according to gas flow are measured
Value controls gas flow regulating valve through pid control algorithm computing, when the absolute value of the gas flow difference exceedes default coal
During throughput difference threshold, the gas flow regulating valve 2 is controlled to adjust in the stove according to the gas flow difference
Gas flow；When the absolute value of the gas flow difference is less than or equal to default gas flow difference threshold, it wouldn't adjust
Gas flow regulating valve 2.
Control system 9 according to the setting value and combustion air flow instrument of combustion air flow set curve measure it is combustion-supporting distinguished and admirable
Amount controls combustion-supporting air flow control valve through pid control algorithm computing, and the combustion air is controlled according to the combustion air flow difference
Combustion-supporting wind flow described in Flow-rate adjustment valve regulation in stove；When the absolute value of the combustion air flow difference is less than or equal in advance
If during combustion air flow difference threshold value, combustion-supporting air flow control valve 3 wouldn't be adjusted.
Gas flow shown in Fig. 3 is set bent by control system 9 using the pid control algorithm in Siemens S7-300 PLC
Line is as the setting value of pid algorithm, and the gas flow that gas flow instrument 1 is measured is used as the measured value of pid algorithm, setting value
Difference with measured value is through pid control algorithm computing, and the output electric signal control gas flow regulating valve 2 of control system 9 makes reality
The gas flow on border is controlled on the gas flow setting curve shown in Fig. 3 respectively, and wherein pid parameter is proportional band P=0.45,
Time of integration Ti=5min.
Combustion-supporting wind flow control is also using 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 is measured is used as the measured value of pid algorithm, setting
Value and the difference of measured value are through pid control algorithm computing, and the output electric signal of control system 9 controls combustion-supporting air flow control valve 4,
Actual combustion-supporting wind flow is set to control the combustion air flow set generated in combustion air flow set curve generation unit 6 respectively
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 models
In enclosing, correspondence precision can reach 0.2-0.5%, kiln burning process is in Automatic Control state, be truly realized stove
Air and coal gas automatic mixing and realize best combustion, that is, save natural resources, the discharge of harmful substance reduced again, 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 invention, including：
Gas flow instrument 1, gas flow regulating valve 2, combustion air flow instrument 3, combustion-supporting air flow control valve 4, calorific value of gas
Instrument 10 and control system 9.
The gas calorific value apparatus 10, for measuring the actual 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 according to the calorific value of gas and the corresponding relation of air-fuel ratio prestored, and gas calorific value apparatus
Actual calorific value of gas in the stove of 10 measurements, determines the actual mixing ratio in the stove；Utilize the gas flow setting prestored
It is worth curve and the actual mixing 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 the coal gas in stove according to gas flow instrument 1 measures the object time
Flow actual value；According to the gas flow setting value and the gas flow actual value, control gas flow regulating valve 2 is adjusted
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 the combustion-supporting wind flow actual value in stove according to combustion air flow instrument 3 measures the object time；According to institute
Combustion air flow setting value and the combustion-supporting wind flow actual value are stated, controls combustion-supporting air flow control valve 4 to adjust in the stove
Combustion-supporting wind flow.
Control system 9 includes PLC control system or DCS control systems.
Gas calorific value apparatus 10 is the serial caloric value instruments of Germany SMART2006.
The gas flow regulating valve 2 is ZKJW-0.6S type motorized adjustment butterfly valves.
Example IV
Control system 9 includes gas flow setting curve generation unit 5, combustion air flow set curve generation unit 6, air-fuel ratio
Computing unit 7 and control unit 8, as shown in figure 5, another reality of the system used in a kind of kiln burning control method of the invention
Apply the module diagram of example, including it is gas flow instrument 1, gas flow regulating valve 2, combustion air flow instrument 3, combustion-supporting distinguished and admirable
Adjustable valve 4, gas calorific value apparatus 10 and control system 9, gas flow instrument 1 and gas flow regulating valve 2 are arranged on stove coal
On the entrance of feed channel, combustion air flow instrument 3 and combustion-supporting air flow control valve 4 are arranged on the entrance of the combustion-supporting wind pipeline of stove
On, control system 9 includes gas flow setting curve generation unit 5, combustion air flow set curve generation unit 6, air-fuel ratio
Computing unit 7 and control unit 8, the output end of gas flow setting curve generation unit 5 are connected with control unit 8, combustion air
The output end of flow set curve generation unit 6 is connected with control unit 8, input and the coal gas heat of air-fuel ratio computing unit 7
It is worth the output end connection of instrument 10, the output end of air-fuel ratio computing unit 7 is connected with automatic control unit 8, automatic control unit 8
Input connects with the output end of gas flow instrument 1, combustion air flow instrument 3, gas regulator 2, combustion air regulating valve 3 respectively
Connect, the output end of automatic control unit 8 is connected with gas flow regulating valve 2 and combustion-supporting air flow control valve 4 respectively, will be respective
Flow control is on the flow setting value of setting curve.
Control system 9 includes PLC control system or DCS control systems.
Control unit 8 is completed in PLC or DCS control systems 9, the input of control unit 8 and gas flow setting curve life
Connected into unit 5, combustion air flow set curve generation unit 6 and air-fuel ratio computing unit 7, the input of control unit 8 also with
Gas flow instrument 1, combustion air flow instrument 3, gas regulator 2, the output connection of combustion air regulating valve 4, control unit 8
Output is connected with gas flow regulating valve 2 and combustion-supporting air flow control valve 4 respectively, and respective flow is controlled in setting curve
On flow setting value.
8 points of control unit is gas flow control and the control of combustion-supporting wind flow.Gas flow control is controlled using PLC or DCS
Pid control algorithm in system 9 processed, gas flow setting curve generation unit 5 is connected with control unit 8, gas flow setting
Curve is as the setting value of control unit 8, and the gas flow that gas flow instrument 1 is measured is used as the measured value of control unit 8；
Setting value and the difference of measured value are through pid control algorithm computing, the output electric signal control gas flow regulating valve of control unit 8
2, make actual gas flow control to set the gas flow setting value that curve generation unit 5 is generated in gas flow respectively
On.
Combustion-supporting wind flow control is also using the pid control algorithm in PLC or DCS control systems 9, and combustion air flow set is bent
Line generation unit 6 is connected with control unit 8, and combustion air flow set curve is used as the setting value of control unit 8, combustion-supporting wind flow
The combustion-supporting wind flow that instrument 2 is measured, is used as the measured value of control unit 8；Setting value and the difference of measured value are through pid control algorithm
Computing, the output electric signal of control unit 8 controls combustion-supporting air flow control valve 4, actual combustion-supporting wind flow is controlled respectively
On the combustion air flow setting value that combustion air flow set curve generation unit 6 is generated.
There is the relation of the actual mixing ratio changed by calorific value of gas with gas flow setting value in combustion air flow setting value,
Control unit 8 is also just controlled actual gas flow and combustion-supporting wind flow by actual mixing ratio, all to ensure that burning
The optimization of control, has accomplished the complete burning of coal gas, has realized the optimized control of stove, has reached energy-conservation, temperature raising, steady temperature
Purpose.
After adopting the above technical scheme, traditional temperature control mode can be changed into flow control mode, overcome temperature stagnant
Big afterwards, the drawbacks of being difficult to control, while calculating the actual mixing ratio changed with calorific value using gas calorific value apparatus, utilizes Gas Flow
Amount setting curve and combustion air flow set curve, the Complex Temperature control of traditional kiln burning is reduced to by actual air-fuel
Two single loop flows control of ratio, is the huge innovation of Combustion System, solves the control problem of traditional kiln burning, make stove
Kiln Combustion System becomes simply to be easily achieved, and has reached gas saving, has improved kiln burning temperature or stable 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 essences in the present invention
Any modifications, equivalent substitutions and improvements made within refreshing and principle etc., should be included in the scope of the protection.
Claims (9)
1. a kind of kiln burning control method, it is characterised in that comprise the following steps：
According to actual coal gas heat in the calorific value of gas and the corresponding relation of air-fuel ratio prestored, and the stove of gas calorific value apparatus measurement
Value, determines the actual mixing ratio in the stove；
Using the gas flow setting value curve and the actual mixing 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 described in the object time gas flow actual value in stove；
According to the gas flow setting value and the gas flow actual value, stove described in control gas flow regulation 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, combustion-supporting air flow control valve regulation institute is controlled
State the combustion-supporting wind flow in stove.
2. a kind of kiln burning control method according to claim 1, it is characterised in that the combustion-supporting wind flow of determination is set
The settled value curve includes：
Each gas flow setting value in the gas flow setting value curve is multiplied with the actual mixing ratio respectively, obtained
To the combustion air flow setting value curve.
3. a kind of kiln burning control method according to claim 1, it is characterised in that the control gas flow regulation
Gas flow described in valve regulation in stove includes：
Calculate the gas flow difference of the gas flow setting value and the gas flow actual value；
When the absolute value of the gas flow difference exceedes default gas flow difference threshold, according to the gas flow difference
Control the gas flow in stove described in the gas flow regulation valve regulation.
4. a kind of kiln burning control method according to claim 1, it is characterised in that the combustion-supporting wind flow of control is adjusted
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 and the combustion-supporting wind flow actual value；
When the absolute value of the combustion air flow difference exceedes default combustion air flow difference threshold value, according to described combustion-supporting distinguished and admirable
Measure the combustion-supporting wind flow in the difference control combustion-supporting air flow control valve regulation stove.
5. a kind of kiln burning control method according to claim 1, it is characterised in that the kinds of gas in the stove cellar for storing things
Including blast furnace gas, coal gas of converter, mixed gas and coke-stove gas.
6. a kind of kiln burning control method according to claim 1, it is characterised 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.
7. a kind of kiln burning control method according to claim 1, it is characterised 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.
8. a kind of a kind of kiln burning control system of kiln burning control method based on described in claim 1-7 any one
System, it is characterised in that including：
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 actual calorific value of gas in stove；
The gas flow instrument（1）, for measuring described in the object time gas flow actual value in stove；
The gas flow regulating valve（2）, for adjusting the gas flow in the stove；
The combustion air flow instrument（3）, for measuring described in the object time combustion-supporting wind flow actual value in stove；
The combustion-supporting air flow control valve（4）, for adjusting the combustion-supporting wind flow in the stove；
The control system（9）, for according to the calorific value of gas and the corresponding relation of air-fuel ratio prestored, and gas calorific value apparatus
（10）Actual calorific value of gas in the stove of measurement, determines the actual mixing ratio in the stove；Set using the gas flow prestored
The settled value curve and the actual mixing ratio, determine combustion air flow setting value curve；According to the gas flow setting value curve
The gas flow setting value of object time is determined, and according to gas flow instrument（1）Measure described in the object time in stove
Gas flow actual value；According to the gas flow setting value and the gas flow actual value, gas flow regulating valve is controlled
（2）Adjust the gas flow in the stove；Helping for the object time is determined according to the combustion air flow setting value curve
Wind flow setting value is fired, and according to combustion air flow instrument（3）Measure described in the object time combustion-supporting wind flow in stove real
Actual value；According to the combustion air flow setting value and the combustion-supporting wind flow actual value, combustion-supporting air flow control valve is controlled（4）Adjust
Save the combustion-supporting wind flow in the stove.
9. a kind of kiln burning control system according to claim 8, it is characterised in that the control system（9）Including
PLC control system or DCS control systems.
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| CN201710530505.2A CN107238100B (en) | 2017-06-28 | 2017-06-28 | Kiln burning control method and system |
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| CN201710530505.2A CN107238100B (en) | 2017-06-28 | 2017-06-28 | Kiln burning control method and system |
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| CN107238100B CN107238100B (en) | 2019-05-03 |
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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 |
| CN108870997A (en) * | 2018-06-27 | 2018-11-23 | 深圳市天圳自动化技术有限公司 | A kind of quantitative heat supply method |
| CN110397934A (en) * | 2019-08-12 | 2019-11-01 | 苏伊士水务工程有限责任公司 | Automatic temperature rise control method and device for incinerator |
| CN111854459A (en) * | 2020-08-05 | 2020-10-30 | 广西柳州钢铁集团有限公司 | Accurate control method for furnace gas temperature of heating furnace |
| 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 |
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| 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 |
| 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 |
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