CN108458486A - A kind of Combustion of Hot Air Furnace automatic control system and its control method - Google Patents

A kind of Combustion of Hot Air Furnace automatic control system and its control method Download PDF

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Publication number
CN108458486A
CN108458486A CN201810331809.0A CN201810331809A CN108458486A CN 108458486 A CN108458486 A CN 108458486A CN 201810331809 A CN201810331809 A CN 201810331809A CN 108458486 A CN108458486 A CN 108458486A
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China
Prior art keywords
fuel
combustion
control valve
gas
aperture
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CN201810331809.0A
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Chinese (zh)
Inventor
章家岩
梁聚齐
冯旭刚
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Anhui University of Technology AHUT
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Anhui University of Technology AHUT
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Priority to CN201810331809.0A priority Critical patent/CN108458486A/en
Publication of CN108458486A publication Critical patent/CN108458486A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N1/00Regulating fuel supply
    • F23N1/02Regulating fuel supply conjointly with air supply
    • F23N1/027Regulating fuel supply conjointly with air supply using mechanical means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N5/00Systems for controlling combustion
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT GENERATING MEANS, IN GENERAL
    • F24H9/00Details
    • F24H9/20Arrangement or mounting of control or safety devices or methods
    • F24H9/2064Arrangement or mounting of control or safety devices or methods for air heaters
    • F24H9/2085Arrangement or mounting of control or safety devices or methods for air heaters for heaters using fluid combustibles

Abstract

The invention discloses a kind of Combustion of Hot Air Furnace automatic control system and its methods, belong to hot-blast stove field.It includes the fuel flow rate detection device and fuel control valve that fuel outlet is equipped with, the combustion air current amount detecting device and help gas control valve that combustion-supporting tracheae is equipped with, it further include fuel analysis instrument, temperature sensor is equipped in hot-blast stove upper inside wall, fuel outlet and combustion-supporting tracheae are connected to burner, burner is connected to hot-blast stove, temperature sensor, fuel flow rate detection device, combustion air current amount detecting device and the fuel analysis instrument is connect with controller input terminal, controller output end and fuel control valve and gas control valve is helped to connect.The problem of hot-blast stove automatic combustion is impacted for the randomness and uncontrollability of propellant composition in the prior art and calorific value, it can effectively reduce propellant composition and calorific value randomness and uncontrollability to the influence caused by hot-blast stove automatic combustion.

Description

A kind of Combustion of Hot Air Furnace automatic control system and its control method
Technical field
The invention belongs to hot-blast stove fields, more specifically to a kind of Combustion of Hot Air Furnace automatic control system and its control Method processed.
Background technology
The process characteristic of hot-blast stove determines the complexity of Combustion of Hot Air Furnace process and not easily-controllable property.These problems are all real The difficult point that existing combustion process automatically controls, is embodied in the following aspects:
(1) randomness and uncontrollability of propellant composition and calorific value.Combustion of Hot Air Furnace uses blast furnace fuel, converter combustion Material and coke oven fuel mixing or one of them.Due to the unstability of blast fumance, the hot-restriking die of blast furnace fuel is caused Larger and blast furnace fuel pressure oscillation is frequent.Simultaneously because user is more, coke oven fuel flow rate is also very unstable, causes three The ingredient fluctuation of kind fuel, causes the fluctuation of combustion process, and then cause fuel combustion insufficient, and there are waste fuel, pollutions The problem of environment.
(2) what best combustion matched is not easy certainty.Since the ingredient of fuel itself fluctuates, combustion process fuel is caused to match The large variation of ratio, best air-fuel proportioning are not easy to determine and are not easy to find.Therefore, entire combustion process must pull against this and ask Topic.In the prior art in order to realize full combustion of fuel mostly using dome temperature, fuel flow rate and oxygen content of waste gas as target control Optimal air-fuel ratio, but the factor for influencing optimal air-fuel ratio in a practical situation is more, can not realize really fully burning.
(3) frequency of blast furnace fuel pressure oscillation.Due to the fluctuation of blast furnace fuel pressure, the frequent of fuel flow rate is caused Fluctuation.The variation of fuel supply directly results in the unstability of combustion process.Therefore, it is necessary to establish a kind of quickly accurate stable The control mode of flow.And realize that the most basic condition of fuel flow stable is exactly to control the regulating valve of fuel flow rate, from And realize to reach by accurately controlling regulating valve and accurately control fuel flow rate, the effect for overcoming fuel pressure to disturb.
(4) property not easy to control of combustion process speed.The control of burning velocity is also must take into consideration the problem of.It is too fast Burning velocity weaken the amount of stored heat of hot-blast stove, excessively slow burning velocity cannot meet requirement of the blast furnace to wind-warm syndrome again. Therefore, it is necessary to by rational control means, hot-blast stove is made reasonably to burn according to the burning time of setting.
(5) ensure the safety of combustion process.Combustion of Hot Air Furnace process has stringent security regulations.How to ensure burned The safety of journey is that autocombustion system first has to solve the problems, such as.
Chinese utility model patent, Authorization Notice No.:204513798 U of CN, authorized announcement date:2015.07.29 open A kind of Combustion of Hot Air Furnace control device, belongs to hot-blast furnace equipment control device technical field, for being carried out to Combustion of Hot Air Furnace It automatically controls.Its technical solution is:The utility model utilizes fuel measurement instrument, combustion air measuring instrumentss, flue gas measuring instrumentss Obtain fuel channel, combustion-supporting wind pipeline and fuel, combustion air and the flue gas data in flue being connect with hot-blast stove, structure The automatic computation model of air-fuel ratio, makes air-fuel ratio calculate automatically in real time, and the air fuel ratio value that operative employee's artificial experience is obtained is same When be introduced into automatic control device, Prevention analysis instrument break down when, control device can continue implement control.Its deficiency It is in the technical solution of the patent builds the automatic computation model of air-fuel ratio, so that air-fuel ratio is calculated automatically in real time, but in the technology Technological means in scheme about the automatic computation model of air-fuel ratio is unclear, and those skilled in the art can not be successfully implementation should Technical solution;In addition, variable is excessive in the program, control is complicated, is difficult to reach ideal control targe in practical operation.
2007 China Steel nd Annual Meeting collection, paper title:《The research and application of hot-blast stove autocombustion system》, make Person:Yang Yongqi, Yang Weiqiang, this document propose the randomnesss and uncontrollability of propellant composition and calorific value, are protected in control strategy Optimal air-fuel ratio has been held, but has not provided the technological means of specific implementation.
Invention content
1, it to solve the problems, such as
Shadow is caused to hot-blast stove automatic combustion for the randomness and uncontrollability of propellant composition in the prior art and calorific value Loud problem, the present invention provides a kind of Combustion of Hot Air Furnace automatic control system and its methods.It can effectively reduce fuel at Divide and the randomness and uncontrollability of calorific value are to the influence caused by hot-blast stove automatic combustion.
2, technical solution
To solve the above problems, the present invention adopts the following technical scheme that.
A kind of Combustion of Hot Air Furnace automatic control system, including the fuel flow rate detection device that is equipped with of fuel outlet and combustion Expect regulating valve, the combustion air current amount detecting device and help gas control valve that combustion-supporting tracheae is equipped with, further include fuel analysis instrument, Hot-blast stove upper inside wall is equipped with temperature sensor, and fuel outlet and combustion-supporting tracheae are connected to burner, burner and heat Wind furnace be connected to, the temperature sensor, fuel flow rate detection device, combustion air current amount detecting device and fuel analysis instrument with Controller input terminal connects, and controller output end and fuel control valve and gas control valve is helped to connect.
Preferably, along fuel conveying direction, combustion is equipped on the fuel outlet that one end is connected to burner inlet successively Expect analyzer, fuel flow rate detection device and fuel control valve, the fuel outlet other end and gas chamber outlet, the coal Gas holder entrance is connected to fuel inlet pipe.
Preferably, further include fuel pressure detection device, along fuel flowing direction, the fuel pressure detection device point On fuel outlet that Wei Yu be at gas chamber exit and burner inlet, the fuel pressure detection device and controller Input terminal connects.
Preferably, further include valve opening sensor, in the combustion-supporting tracheae for helping gas control valve to be connected to burner inlet It is equipped with the valve opening sensor, institute also is provided on the fuel outlet that fuel control valve is connected to burner inlet The valve opening sensor stated, valve opening sensor are connect with controller input terminal.
Preferably, the flue gas leading being connected to hot-blast stove is equipped with oxygen conten analyser and temperature sensor, the temperature Sensor and oxygen conten analyser are connect with controller input terminal.
Preferably, hot-blast stove entrance is connected to burner outlet, and multiple temperature are evenly distributed in hot-blast stove upper inside wall Sensor is spent, temperature sensor is connect with controller input terminal.
Preferably, the combustion air current amount detecting device and gas control valve is helped to be respectively positioned on combustion-supporting tracheae, combustion-supporting gas Pipe one end is connected to combustion-supporting gas holder, and the combustion-supporting tracheae other end is connected to burner inlet.
A kind of Combustion of Hot Air Furnace autocontrol method, step are:
A, a kind of above-described Combustion of Hot Air Furnace automatic control system is built, fuel analysis instrument, fuel analysis instrument are opened The fuel element and calorific value data of detection are real-time transmitted to controller, and controller calculates according to air-fuel ratio model and determines fuel in real time Fully burn required fuel flow rate and the ideal ratio x of combustion air current amount, according to the discharge characteristic of valve, so that it is determined that combustion Material regulating valve and the opening ratio z for helping gas control valve;
B, it burns initial stage:
B1, it first opens and helps gas control valve, increase combustion air current amount, aperture 10%-15%, be delayed 5-10s;Further according to Fuel control valve and the opening ratio z for helping gas control valve, controller adjust the aperture of fuel control valve, and be delayed 5-10s;
B2, increase combustion-supporting gas control valve opening, at the same time, the opening ratio z being calculated according to controller is adjusted in real time Fuel adjusting valve opening, until when combustion-supporting gas control valve opening or maximum fuel adjusting valve opening arrival;
Flue gas oxygen content is adjusted:
Simultaneously with the above, the temperature sensor on hot-blast stove detects hot-blast stove dome temperature and is transferred to controller, Compared with the dome temperature of setting, during not up to expected dome temperature, detection flue gas oxygen content is y, ideal flue gas Oxygen content ranging from a-b;
If y<(a+b)/2 fuel adjusting valve opening, is then turned down, while controller adjusts combustion-supporting controlled atmosphere section according to opening ratio z Valve opening;Or increase combustion-supporting gas control valve opening, while controller adjusts fuel adjusting valve opening according to opening ratio z;If y>(a + b)/2, then it turns down combustion-supporting gas control valve opening or remains unchanged, while controller adjusts fuel control valve according to opening ratio z Aperture;Or increase fuel adjusting valve opening, while controller is according to opening ratio z, while adjusting combustion-supporting gas control valve opening;
C, the accumulation of heat phase
After reaching expected dome temperature, into storage heater, in the case where ensureing that dome temperature is constant, according to control Device detects flue-gas temperature, the speed for the flue gas temperature rise rate being calculated, to adjust combustion-supporting gas control valve opening or fuel adjusting Valve opening turns down fuel adjusting valve opening, while controller adjusts combustion-supporting controlled atmosphere according to opening ratio z if temperature rise rate is fast Save valve opening;Then combustion-supporting gas control valve opening is turned down again, while controller adjusts fuel adjusting valve opening according to opening ratio z; If temperature rise rate is slow, increase combustion-supporting gas control valve opening, while controller adjusts fuel control valve and open according to opening ratio z Degree;Then increase fuel adjusting valve opening again, while controller adjusts combustion-supporting gas control valve opening according to opening ratio z;So that cigarette Temperature degree reaches set temperature value;
The accumulation of heat phase is using flue-gas temperature and flue gas temperature rise rate as helping the regulation and control of gas control valve, fuel control valve to refer to Mark, while with the subtle control valve aperture of flue gas oxygen content, regulative mode is the same as step C;
D, the accumulation of heat period of saturation
After flue-gas temperature reaches setting value, into the accumulation of heat period of saturation, it is gradual that controller adjusts fuel adjusting valve opening Reduce, while controller adjusts combustion-supporting gas control valve opening according to opening ratio z;Controller is continued to dome temperature simultaneously Control, until burning terminate.
Preferably, the ideal ratio of fuel flow rate and combustion air current amount is;
Wherein:
Vo2, the oxygen purity in combustion-supporting gas;
b0——H2Quality-volumetric concentration;
b1--- quality-volumetric concentration of CO;
b2——CH4Quality-volumetric concentration;
a3——CnHmVolumetric concentration;
b4——O2Quality-volumetric concentration.
Preferably, after adjusting combustion-supporting gas control valve opening, controller is helped by what combustion air current amount detecting device detected The actual flow of combustion gas, controller according to air-fuel ratio model in real time calculate determine the required fuel flow rate of full combustion of fuel and The ideal ratio x of combustion air current amount, then further according to the discharge characteristic of valve, so that it is determined that the aperture of fuel control valve, is adjusted Fuel control valve;
After adjusting fuel adjusting valve opening, the practical stream for the fuel that controller is detected by fuel flow rate detection device Amount, controller calculate the required fuel flow rate of determination full combustion of fuel and combustion air current amount according to air-fuel ratio model in real time Ideal ratio x, so that it is determined that helping the aperture of gas control valve, adjusts combustion-supporting controlled atmosphere section then further according to the discharge characteristic of valve Valve.
3, advantageous effect
Compared with the prior art, beneficial effects of the present invention are:
(1) a kind of Combustion of Hot Air Furnace automatic control system of the invention, the temperature sensor on hot-blast stove detect hot-blast stove Top temperature, fuel flow rate detection device detect fuel flow rate, and combustion air current amount detecting device detects combustion air current amount, fuel point Analyzer detects fuel element content and fuel value, and data above is all transported to controller input terminal, with optimum air-fuel ratio For target, that is, ensure full combustion of fuel, and release net quantity of heat;Controller is calculated according to model needed for combustion-supporting gas in real time The actual flow of the flow of setting, the combustion-supporting gas detected with combustion air current amount detecting device is compared, defeated by controller Outlet controls fuel control valve and helps the opening size of gas control valve, and then accurately controls Combustion of Hot Air Furnace process, to have Effect reduces the fluctuation of propellant composition and calorific value to the influence caused by Combustion of Hot Air Furnace;
(2) a kind of Combustion of Hot Air Furnace automatic control system of the invention, the gas chamber can effective steady fuel Entrance pipe pressure:When fuel inlet pipe pressure is higher than the design pressure of gas chamber, fuel is put into gas chamber storage;When fuel enters When mouth pipe pressure reduces, the fuel in gas chamber fills into fuel inlet pipe, and blast furnace fuel pressure can be effectively reduced by gas chamber Fluctuation is frequently to the influence caused by Combustion of Hot Air Furnace;
(3) a kind of Combustion of Hot Air Furnace automatic control system of the invention, by the way that fuel is arranged on the both ends of fuel outlet Pressure-detecting device to detect the pressure value at gas chamber exit and burner inlet, and is conveyed to controller, to examine The variation for surveying fuel pressure on fuel outlet, after controller receives the change value of pressure, the safe pressure value ratio with setting Compared with, the safe pressure value and the pressure at hot-blast stove internal pressure, gas chamber exit and burner inlet are related, if super The range for going out safe pressure value, then sound the alarm, and starts emergency safety and runs program, to ensure pressure change in controlled range It is interior, it is ensured that hot-blast stove safety automation burns;
(4) a kind of Combustion of Hot Air Furnace automatic control system of the invention, valve opening sensor is for detecting fuel adjusting Valve and the opening size and aperture situation of change for helping gas control valve;Fuel control valve and help gas control valve that can select to make With butterfly valve and ball valve, preferential selection uses butterfly valve, the discharge characteristic of butterfly valve that can more accurately be controlled close to equal percentage characteristics The opening size of valve processed, so that it is guaranteed that the precision control of automatic combustion process;
(5) a kind of Combustion of Hot Air Furnace automatic control system of the invention, the temperature sensor on flue gas leading detect exhaust gas temperature Degree, oxygen conten analyser detect the oxygen content in exhaust gas, and data above is all transported to controller input terminal, with optimum air-fuel ratio For target, according to the main combustion period variation demand different to air heating furnace roof temperature with the accumulation of heat phase, controller carries out above-mentioned data After processing, fuel control valve is controlled by controller output end and helps the opening size of gas control valve, and then accurately controls heat Wind furnace combustion process, with effectively reduce propellant composition and calorific value fluctuation and blast furnace fuel pressure oscillation frequently to hot-blast stove Influence caused by burning;
(6) a kind of Combustion of Hot Air Furnace automatic control system of the invention, the setting of multiple temperature sensors can be more accurate True reaction hot-blast stove top temperature value, the temperature value conveying of equally distributed multiple temperature sensors in hot-blast stove upper inside wall It gives controller input terminal, controller to be filtered temperature value, after rejecting abnormalities value, medium filtering can be selected or arithmetic is flat It filters, to obtain accurate air heating furnace roof temperature value, and then improves the precision that Combustion of Hot Air Furnace automatically controls;
(7) a kind of Combustion of Hot Air Furnace automatic control system of the invention, combustion-supporting gas holder provides pressure and ingredient is fixed helps Combustion gas is passed into burner, to avoid the fluctuation of combustion-supporting atmospheric pressure and ingredient to caused by the control of hot-blast stove automatic combustion It influences, controller only needs the flow for controlling combustion-supporting gas by helping gas control valve that main combustion period and storage to hot-blast stove can be realized The Combustion Process Control of hot phase;
(8) a kind of Combustion of Hot Air Furnace autocontrol method of the invention, combustion-supporting gas holder provides pressure and ingredient is fixed helps Combustion gas, and combustion-supporting gas and fuel flow rate are constant, so that it is guaranteed that helping gas pipe pressure constant, the constant of fuel flow rate reduces Influence the factor of fuel pressure fluctuation reduces the variable quantity of control, to make control when hot-blast stove automatic combustion controls Method simplifies, and saves control cost, is easy to implement accurately controlling for hot-blast stove automatic combustion;
(9) a kind of Combustion of Hot Air Furnace autocontrol method of the invention, the regulating effect at initial stage of burning are to ensure fully Under the premise of burning (keeping ideal air-fuel ratio), adjusts fuel adjusting valve opening and reach maximum, accelerated combustion process reaches as early as possible Or the dome temperature close to setting;Simultaneously, it is ensured that flue gas oxygen content maintains in the ideal range, and oxygen content of smoke gas is high, explanation It is burned abundant, it is therefore desirable to reduce combustion-supporting tolerance and either increase fuel quantity or help gas control valve constant;Oxygen content of smoke gas Height illustrates to burn insufficient, it is therefore desirable to increase combustion-supporting tolerance or reduce fuel quantity;
(10) a kind of Combustion of Hot Air Furnace autocontrol method of the invention, realizes hot-blast stove fuel value, combustion air The flowed fluctuation of pipeline pressure and fuel combination pipeline pressure and air and fuel combination etc. considers, can be with The randomness and uncontrollability of propellant composition and calorific value are reduced to greatest extent, and best combustion proportioning is not easy certainty, blast furnace The frequency of fuel pressure fluctuation realizes the clean-burning optimality control of Combustion of Hot Air Furnace to greatest extent;
(11) a kind of Combustion of Hot Air Furnace autocontrol method of the invention, by best air-fuel during Combustion of Hot Air Furnace The searching of ratio can not only reduce the consumption of fuel, save the energy, but also it is insufficient generated big to reduce burning Measure NO2And SO2, alleviate the pollution to environment.
Description of the drawings
Fig. 1 is the system structure diagram of the present invention;
Fig. 2 is the schematic diagram of gas chamber.
In figure:1, gas chamber;11, piston;12, fuel inlet pipe;13, fuel outlet;131, fuel pressure detection dress It sets;132, fuel flow rate detection device;133, fuel analysis instrument;134, fuel control valve;135, valve opening sensor;21、 Combustion-supporting tracheae;211, combustion air current amount detecting device;212, gas control valve is helped;2, burner;3, hot-blast stove;31, temperature passes Sensor;32, flue gas leading;321, oxygen conten analyser.
Specific implementation mode
The present invention is further described below in the following with reference to the drawings and specific embodiments.
Embodiment 1
In conjunction with Fig. 1 and 2, a kind of Combustion of Hot Air Furnace automatic control system, including the temperature sensor that is arranged on hot-blast stove 3 31, the fuel outlet 13 that one end is connected to 2 entrance of burner is equipped with fuel pressure detection device 131, fuel flow rate detects Device 132 and fuel control valve 134, the combustion-supporting tracheae 21 being connected to 2 entrance of burner are equipped with combustion air current amount detecting device 211 and gas control valve 212 is helped, further include the fuel analysis instrument 133 being located on fuel outlet 13, what is be connected to hot-blast stove gives up Tracheae 32 is equipped with oxygen conten analyser 321 and temperature sensor 31, the temperature sensor 31, fuel pressure detection device 131, fuel flow rate detection device 132, combustion air current amount detecting device 211, fuel analysis instrument 133 and oxygen conten analyser 321 It is connect with controller input terminal, controller output end and fuel control valve 134 and gas control valve 212 is helped to connect.
Embodiment 2
In conjunction with Fig. 1 and 2, a kind of Combustion of Hot Air Furnace automatic control system, including The fuel stream that fuel outlet 13 is equipped with Amount detecting device 132 and fuel control valve 134, the combustion air current amount detecting device 211 and combustion-supporting gas that combustion-supporting tracheae 21 is equipped with Regulating valve 212 further includes fuel analysis instrument 133, and temperature sensor 31, fuel outlet are equipped in 3 upper inside wall of hot-blast stove 13 and combustion-supporting tracheae 21 be connected to burner 2, burner 2 is connected to hot-blast stove 3, the temperature sensor 31, The fuel stream Amount detecting device 132, combustion air current amount detecting device 211 and fuel analysis instrument 133 are connect with controller input terminal, controller Output end and fuel control valve 134 and gas control valve 212 is helped to connect.
Burner 2 is equipped with fuel inlet and helps fuel gas inlet, and fuel outlet 13 connects with the fuel inlet on burner 2 Logical, combustion-supporting tracheae 21 helps fuel gas inlet to be connected to on burner 2, and the outlet of burner 2 is connected to 3 entrance of hot-blast stove.Hot-blast stove 3 Outside is uniformly provided with multiple burners 2, and the access of multiple burners 2 forms whirlpool in hot-blast stove 3, leads to 3 top of hot-blast stove Temperature Distribution otherness it is larger, i.e. the temperature at the top of hot-blast stove 3 cannot really react 3 top temperature value of hot-blast stove, and this To obtain 3 top temperature value of true hot-blast stove in application, creatively temperature sensor 31 is arranged on 3 top of hot-blast stove, 3 top temperature value of hot-blast stove can more accurately be reacted;Dome temperature amplitude of variation, Yi Jibian can more accurately be stablized Change the frequency, reduce temperature fluctuation so that Combustion of Hot Air Furnace is in stable condition, saves fuel quantity.
Temperature sensor 31 on hot-blast stove 3 detects 3 top temperature of hot-blast stove, the detection combustion of fuel flow rate detection device 132 Stream amount, combustion air current amount detecting device 211 detect combustion air current amount, fuel analysis instrument 133 detect fuel element content and Fuel value, data above are all transported to controller input terminal, using optimum air-fuel ratio as target, that is, ensure that fuel fully fires It burns, and releases net quantity of heat;Controller calculates the flow being arranged needed for combustion-supporting gas according to model in real time, with combustion air current amount The actual flow for the combustion-supporting gas that detection device 211 detects is compared, and fuel control valve 134 is controlled by controller output end With help the opening size of gas control valve 212, and then accurately control Combustion of Hot Air Furnace process, to effectively reduce propellant composition and The fluctuation of calorific value burns to hot-blast stove 3 caused influence.
Embodiment 3
In conjunction with Fig. 1 and 2, a kind of Combustion of Hot Air Furnace automatic control system of the present embodiment, on the basis of embodiment 1 or 2 It is further improved, along fuel conveying direction, is equipped with combustion on the fuel outlet 13 that one end is connected to 2 entrance of burner successively Material analyzer 133, fuel flow rate detection device 132 and fuel control valve 134,13 other end of fuel outlet go out with gas chamber 1 Mouth connection, 1 entrance of the gas chamber are connected to fuel inlet pipe 12.
The gas chamber 1 can effective steady fuel inlet tube 12:When 12 pressure of fuel inlet pipe is higher than gas chamber 1 Design pressure, fuel be put into gas chamber storage;When fuel inlet 12 pressure reduction of pipe, the fuel in gas chamber 1 fills into Fuel inlet pipe 12 can effectively reduce blast furnace fuel pressure oscillation frequently to the shadow caused by Combustion of Hot Air Furnace by gas chamber 1 It rings.
There are many type of gas chamber 1, in this application can be according to using needs, selecting dish gas holder, dry gas-holder, straight Lift-type, spiral, full thorax sink or annular water tank, it is such as different by material and have prestressed reinforced concrete sink and steel structure water Slot is not.
Embodiment 4
In conjunction with Fig. 1 and 2, a kind of Combustion of Hot Air Furnace automatic control system of the present embodiment, on the basis of embodiment 1 or 2 or 3 On be further improved, further include fuel pressure detection device 131, along fuel flowing direction, the fuel pressure detection dress It sets on the fuel outlet 13 that 131 are located at 1 exit of gas chamber and burner inlet, fuel pressure detection dress 131 are set to connect with controller input terminal.
By the way that fuel pressure detection device 131 is arranged on the both ends of fuel outlet 13, to detect 1 exit of gas chamber With the pressure value at burner inlet, and it is conveyed to controller, to detect the variation of fuel pressure on fuel outlet 13, control After device processed receives the change value of pressure, compared with the change value of pressure set on fuel outlet 13, and then fuel tune is controlled 134 opening size of valve is saved, further decreases fuel pressure variation to the combustion effects of hot-blast stove 3, the pressure at burner inlet When force value is more than 1 outlet pressure value of gas chamber, control 134 aperture of fuel control valve is opened greatly;Pressure at burner inlet When value is less than 1 outlet pressure value of gas chamber, control 134 aperture of fuel control valve is opened small.
By the way that fuel pressure detection device is arranged on the both ends of fuel outlet, to detect gas chamber exit and burning The pressure value of device inlet, and it is conveyed to controller, to detect the variation of fuel pressure on fuel outlet, controller receives To after the change value of pressure, compared with the safe pressure value of setting, which goes out with hot-blast stove internal pressure, gas chamber Pressure at mouthful and at burner inlet is related, if the range beyond safe pressure value, sounds the alarm, starts urgent peace Line program for the national games, to ensure pressure change in controlled range, it is ensured that hot-blast stove safety automation burns.
Embodiment 5
In conjunction with Fig. 1 and 2, a kind of Combustion of Hot Air Furnace automatic control system of the present embodiment, in embodiment 1 or 2 or 3 or 4 On the basis of be further improved, further include valve opening sensor 135, be connected to 2 entrance of burner helping gas control valve 212 Combustion-supporting tracheae 21 be equipped with the valve opening sensor 135, be connected to 2 entrance of burner in fuel control valve 134 The valve opening sensor 135 also is provided on fuel outlet 13, valve opening sensor 135 connects with controller input terminal It connects.
Valve opening sensor 135 be used for detect fuel control valve 134 and help gas control valve 212 opening size and Aperture situation of change;Fuel control valve 134 and help gas control valve 212 that can select that butterfly valve and ball valve, preferential selection is used to make With butterfly valve, the discharge characteristic of butterfly valve is close to equal percentage characteristics.
Embodiment 6
In conjunction with Fig. 1 and 2, a kind of Combustion of Hot Air Furnace automatic control system of the present embodiment, in embodiment 1 or 2 or 3 or 4 or 5 On the basis of be further improved, the flue gas leading 32 being connected to hot-blast stove 3 be equipped with oxygen conten analyser 321 and temperature sensor 31, the temperature sensor 31 and oxygen conten analyser 321 are connect with controller input terminal.
Temperature sensor 31 on flue gas leading 32 detects exhaust gas temperature, and the oxygen that oxygen conten analyser 321 detects in exhaust gas contains Amount, data above is all transported to controller input terminal, using optimum air-fuel ratio as target, according to main combustion period and accumulation of heat phase to hot wind The different variation demand of 3 top temperature of stove, after controller handles above-mentioned data, fuel is controlled by controller output end Regulating valve 134 and the opening size for helping gas control valve 212, and then Combustion of Hot Air Furnace process is accurately controlled, to effectively reduce combustion The fluctuation and blast furnace fuel pressure oscillation of material ingredient and calorific value frequently burn to hot-blast stove 3 caused influence.
Embodiment 7
In conjunction with Fig. 1 and 2, a kind of Combustion of Hot Air Furnace automatic control system of the present embodiment, in embodiment 1 or 2 or 3 or 4 or 5 Or be further improved on the basis of 6,3 entrance of hot-blast stove and 2 outlet of burner, in 3 upper inside wall of hot-blast stove uniformly Multiple temperature sensors 31 are distributed with, temperature sensor 31 is connect with controller input terminal.
The setting of multiple temperature sensors 31, can more accurately react 3 top temperature value of hot-blast stove, on hot-blast stove 3 The temperature value of equally distributed multiple temperature sensors 31 is conveyed to controller input terminal on portion's inner wall, controller to temperature value into Row is filtered, and after rejecting abnormalities value, medium filtering or digital averaging filtering can be selected, to obtain 3 furnace roof of accurate hot-blast stove Temperature value, and then improve the precision that Combustion of Hot Air Furnace automatically controls.
Embodiment 8
In conjunction with Fig. 1 and 2, a kind of Combustion of Hot Air Furnace automatic control system of the present embodiment, in embodiment 1 or 2 or 3 or 4 or 5 Or be further improved on the basis of 6 or 7, the combustion air current amount detecting device 211 and gas control valve 212 is helped to be respectively positioned on On combustion-supporting tracheae 21,21 one end of combustion-supporting tracheae is connected to combustion-supporting gas holder, and 21 other end of combustion-supporting tracheae is connected to 2 entrance of burner.
Combustion-supporting gas holder provides pressure and the fixed combustion-supporting gas of ingredient is passed into burner 2, to avoid combustion-supporting atmospheric pressure To the influence caused by the control of hot-blast stove automatic combustion, controller only needs, by helping gas control valve 212, to control for fluctuation with ingredient Combustion Process Control to the main combustion period and accumulation of heat phase of hot-blast stove can be realized in the flow for making combustion-supporting gas.
Embodiment 9
In conjunction with Fig. 1 and 2, a kind of Combustion of Hot Air Furnace autocontrol method, step is:
A, a kind of Combustion of Hot Air Furnace automatic control system described in embodiment 1 or 2 or 3 or 4 or 5 or 6 or 7 is built, is beaten Fuel analysis instrument 133 is opened, the fuel element and calorific value data that fuel analysis instrument 133 detects are real-time transmitted to controller, controller Calculate the ideal ratio for determining full combustion of fuel required fuel flow rate and combustion air current amount in real time according to air-fuel ratio model X, according to the discharge characteristic of valve, so that it is determined that the fuel control valve 134 and opening ratio z for helping gas control valve 212;
Combustion-supporting gas holder provides pressure and the fixed combustion-supporting gas of ingredient, and combustion-supporting gas and fuel flow rate are constant, so that it is guaranteed that Help gas pipe pressure constant, the constant of fuel flow rate reduces the factor for influencing fuel pressure fluctuation, is fired automatically in hot-blast stove When burning control, reduce the variable quantity of control, to make control method simplify, saves control cost, be easy to implement hot-blast stove Automatic combustion accurately controls.
B, it burns initial stage:
B1, it first opens and helps gas control valve 212, increase combustion air current amount, aperture 10%-15%, be delayed 5-10s;Again According to fuel control valve 134 and the opening ratio z for helping gas control valve 212, controller adjusts the aperture of fuel control valve 134, prolongs When 5-10s;
B2, increase help 212 aperture of gas control valve, at the same time, the opening ratio z being calculated according to controller, and in real time 134 aperture of fuel control valve is adjusted, is when helping 212 aperture of gas control valve or 134 aperture of fuel control valve reaches maximum Only;
Flue gas oxygen content is adjusted:
Simultaneously with the above, the temperature sensor 31 on hot-blast stove 3 detects 3 dome temperature of hot-blast stove and is transferred to control Device, compared with the dome temperature of setting, during not up to expected dome temperature, detection flue gas oxygen content is y, ideal cigarette Gas oxygen content ranging from a-b;
If y<(a+b)/2 134 aperture of fuel control valve, is then turned down, while controller adjusts combustion-supporting gas according to opening ratio z 212 aperture of regulating valve;Or increase and help 212 aperture of gas control valve, while controller adjusts fuel control valve according to opening ratio z 134 apertures;If y>(a+b)/2 it, then turns down and helps 212 aperture of gas control valve or remain unchanged, while controller is according to aperture Than z, 134 aperture of fuel control valve is adjusted;Or increase 134 aperture of fuel control valve, while controller is according to opening ratio z, simultaneously Adjusting helps 212 aperture of gas control valve;
The regulating effect at burning initial stage is:Under the premise of ensuring fully to burn and (keep ideal air-fuel ratio), fuel is adjusted 134 aperture of regulating valve reaches maximum, and accelerated combustion process reaches or approach the dome temperature of setting as early as possible;Simultaneously, it is ensured that cigarette Gas oxygen content maintains in the ideal range, and oxygen content of smoke gas is high, illustrate burned abundant, it is therefore desirable to reduce combustion-supporting tolerance or Increase fuel quantity or helps gas control valve constant;Oxygen content of smoke gas is high, illustrates to burn insufficient, it is therefore desirable to increase combustion-supporting gas Amount reduces fuel quantity.
C, the accumulation of heat phase
After reaching expected dome temperature, into storage heater, in the case where ensureing that dome temperature is constant, according to control Device detects flue-gas temperature, and the speed for the flue gas temperature rise rate being calculated helps 212 aperture of gas control valve or fuel tune to adjust 134 aperture of valve is saved, if temperature rise rate is fast, turns down 134 aperture of fuel control valve, while controller is adjusted according to opening ratio z Help 212 aperture of gas control valve;Then it turns down again and helps 212 aperture of gas control valve, while controller is adjusted according to opening ratio z 134 aperture of fuel control valve;If temperature rise rate is slow, increase helps 212 aperture of gas control valve, while controller is according to aperture Than z, 134 aperture of fuel control valve is adjusted;Then increase 134 aperture of fuel control valve again, while controller is according to opening ratio z, Adjusting helps 212 aperture of gas control valve;So that flue-gas temperature reaches set temperature value;
The accumulation of heat phase is using flue-gas temperature and flue gas temperature rise rate as the tune for helping gas control valve 212, fuel control valve 134 Index is controlled, while with the subtle control valve aperture of flue gas oxygen content, regulative mode is the same as step C;
D, the accumulation of heat period of saturation
After flue-gas temperature reaches setting value, into the accumulation of heat period of saturation, controller adjust 134 aperture of fuel control valve by It is decrescence small, while controller, according to opening ratio z, adjusting helps 212 aperture of gas control valve;Controller is continued to vault simultaneously The control of temperature, until burning terminates.
Help the adjusting method of gas control valve 212 and fuel control valve 134 as follows:
After adjusting helps 212 aperture of gas control valve, controller is detected combustion-supporting by combustion air current amount detecting device 211 The actual flow of gas, controller calculate according to air-fuel ratio model and determine the required fuel flow rate of full combustion of fuel and help in real time The ideal ratio x of gas flow, then further according to the discharge characteristic of valve, so that it is determined that the aperture of fuel control valve 134, is adjusted Fuel control valve 134;
After adjusting 134 aperture of fuel control valve, the reality for the fuel that controller is detected by fuel flow rate detection device 132 Border flow, controller calculate according to air-fuel ratio model and determine the required fuel flow rate of full combustion of fuel and combustion air current in real time The ideal ratio x of amount, so that it is determined that helping the aperture of gas control valve 212, is adjusted combustion-supporting then further according to the discharge characteristic of valve Gas regulating valve 212.
Embodiment 10
In conjunction with Fig. 1 and 2, a kind of Combustion of Hot Air Furnace autocontrol method of the present embodiment is similar to Example 9, difference It is in the ideal ratio of fuel flow rate and combustion air current amount is:
Wherein:
Vo2, the oxygen purity in combustion-supporting gas;
b0——H2Quality-volumetric concentration;
b1--- quality-volumetric concentration of CO;
b2——CH4Quality-volumetric concentration;
a3——CnHmVolumetric concentration;
b4——O2Quality-volumetric concentration.
Flow in unit interval is equal to the volume in the unit interval;The flow and pressure of fluid (including gas and liquid) The relationship of power can be expressed with the Bernoulli equation in hydrodynamics:
C=P+ ρ gh+ (1/2) * ρ * v2
P, ρ, v are respectively pressure, density and the speed of fluid in formula, and h is vertical direction height;G is acceleration of gravity;C It is constant constant.
For gas, gravity can be ignored, equation simplification is:
C=P+ (1/2) * ρ * v2
Relationship between the flow of fluid, pressure difference, diameter:
Q=P+ ρ gSL+ [(1/2) * ρ * v2];
In formula:Q --- flow, m3/s;
P --- pipe ends pressure difference, Pa
ρ --- density, kg/m3
G --- acceleration of gravity, m/s2
S --- pipe friction, S=10.3*n2/ d*5.33, n are inside pipe wall roughness, and d is bore, m;
L --- duct length, m;
V --- flow velocity, V=4Q/ (3.1416*d2), flow rate m/s.
For gas, gravity can be ignored, equation simplification is:
Q=Δs P+ [(1/2) * ρ * v2] (1)
In formula:Q --- flow, m3/s
Δ P --- pipe ends pressure difference, N
ρ --- density, kg/m3
V --- flow velocity, V=4Q/ (3.1416*d2), flow rate m/s.
Volumetric concentration is volume number (cubic centimetre) or (ml/m containing pollutant in the air with every cubic metre3) carry out table Show, common representation method is ppm, i.e. 1ppm=1 cubic centimetres/cubic meter=10-6
For the concentration indicated with the mass number of pollutant in every cubic metre of air quality-volumetric concentration, unit is (milli Gram/cubic metre) or (gram/cubic metre), the conversion relation of it and ppm is:
X=M × C/22.4;
In unit volume, the pollutant per C quantity ppm is equivalent equal to X milligrams of pollutants.
C=22.4X/M;
In formula:The concentration value that X --- pollutant is indicated with the milligram number of every mark cubic meter;
The concentration value that C --- pollutant is indicated with ppm;
The molecular weight of M --- pollutant.
Following relationship is arrived as available from the above equation:
1ppm=M/22.4 (mg/m3) (2)。
Fuel analysis instrument 133 can obtain each component concentration, usually be shown with ppm (100 a ten thousandth) for unit Volumetric concentration, need exist for it being scaled quality-volumetric concentration, finally by unit conversion be kg/m3
Assuming that H in mixed gas2, CO, CH4, CnHm, O2, the concentration of component of five kinds of gas is (usually by fuel analysis instrument 133 What is obtained is volumetric concentration) it is respectively a0, a1, a2, a3, a4, related conversion is carried out through formula (2), obtains corresponding quality-volume Concentration is respectively b0, b1, b2, b3, b4, correlation computations formula is as follows:
b0=a0*[M/22.4]*10-6=a0*[2/22.4]*10-6(kg/m3) (3);
b1=a1*[M/22.4]*10-6=a1*[28/22.4]*10-6(kg/m3) (4);
b2=a2*[M/22.4]*10-6=a2*[16/22.4]*10-6(kg/m3) (5);
b3=a3*[M/22.4]*10-6=a3*[(12n+m)/22.4]*10-6(kg/m3) (6);
b4=a4*[M/22.4]*10-6=a4*[32/22.4]*10-6(kg/m3) (7);
Burn required air quantity:Every cube of (kilogram) fuel presses the amount of oxygen needed for combustion reaction metering-type completely burned, I.e. required minimum oxygen amount.Fuel gas buring reaction equation:
In above formula, hydrogen sulfide gas can be ignored, oxygen demand is because content is relatively low in mixed gas:
If the selection of combustion-supporting gas is using air, air requirement is:
According to formula (8), can obtain fuel (i.e. mixed gas) theoretical oxygen demand is:
Oxygen demand:
V, combustion-supporting gas product;
Vo2, the oxygen purity in combustion-supporting gas.
The ideal ratio of fuel flow rate and combustion air current amount is:
Formula (1) is substituted into formula (8), can be obtained:
In formula,
Δ P --- pipe ends pressure difference, N
ρ --- density, kg/m3
V --- flow velocity, V=4Q/ (3.1416*d2), flow rate m/s.b0——H2Quality-volumetric concentration;
b1--- quality-volumetric concentration of CO;
b2——CH4Quality-volumetric concentration;
a3——CnHmVolumetric concentration;
b4——O2Quality-volumetric concentration.
According to formula (9), can obtain mixed gas theoretical air requirement is:
Formula (1) is substituted into formula (9), can be obtained:
In formula,
Δ P --- pipe ends pressure difference, N;
ρ --- density, kg/m3
V --- flow velocity, V=4Q/ (3.1416*d2), m/s;
b0——H2Quality-volumetric concentration;
b1--- quality-volumetric concentration of CO;
b2——CH4Quality-volumetric concentration;
a3——CnHmVolumetric concentration;
b4——O2Quality-volumetric concentration;
Air capacity is actually needed, it is contemplated that excess air coefficient:
For industrial equipment:α=1.05-1.2;Domestic gas appliance:α=1.3-1.8;Actual air requirement:V=α V0
The density calculation formula of mixed gas (i.e. fuel):
In formula:
ρ --- mixed gas density, kg/m3
P --- mixed gas pressure intensity, kPa;
R --- be constant, 8.314;
T --- absolute temperature, unit K, absolute temperature T=Celsius temperature t+273 degree;
Mavg--- mixed gas molal weight.
Embodiment 11
In conjunction with Fig. 1 and 2, a kind of Combustion of Hot Air Furnace autocontrol method of the present embodiment pays attention to following in specific application Security measures:
(1) at burning initial stage, after fuel and air small guide vane is passed through in hot-blast stove 3, in the burning by the unit interval Afterwards, variation that be according to fire box temperature (dome temperature) in this period judge whether burner 2 normal (if the unit interval it Afterwards, the dome temperature of hot-blast stove 3 does not change, then operating personnel is prompted to pay attention to checking whether burner 2 works normally). After fuel quantity and air capacity increase to the amount needed for normal combustion, according to the climbing speed of dome temperature value, the calorific value of fuel And fuel control valve 134 decides whether to adjust 134 aperture of fuel control valve, Jin Ershi with the aperture of gas control valve 212 is helped Now quickly reach dome temperature.
(2) it in each fuel control valve 134 and helps on gas control valve 212 valve positioner is installed, by valve opening Value is compared with the opening value that controller gives, and valve opening caused by preventing valve aging, abrasion, failure and other reasons is not It is right, combustion process is impacted.
(3) in addition, installing pressure-detecting device on combustion-supporting tracheae 21, when there is pressure anomaly, standby signal is sent out, Operating personnel are reminded to check wind turbine, pipeline, blast pressure caused by preventing wind turbine, pipeline from going wrong is insufficient, in turn results in combustion Combustion air current amount needed for burning is inadequate.It is arranged using dual blower, if the wind when being sent into combustion-supporting gas and carrying out 3 combustion phases of hot-blast stove Machine breaks down, then immediately switches another standby fan that put into operation.
(4) it after exhaust gas (flue gas) temperature reaches setting value, if fuel control valve 134 does not change, makes a sound Alarm signal reminds operating personnel to pay attention to checking.If over time, flue-gas temperature continues to increase, then sound-light alarm is sent out Signal, and it is switched to the adjusting that manual operation carries out fuel control valve 134, blowing out operation can be carried out when necessary.
(5) when fuel pressure is less than 5kPa or air pressure is less than 3kPa, switch to be manually operated automatically, and send out report Alert signal.
Certain company is compared, a kind of hot-blast stove of Combustion of Hot Air Furnace automatic control system using the present invention, vault Maximum temperature undulating value is 5 DEG C, and the number that temperature is reduced more than 3 DEG C is 2 times, and gas consumption amount is 124697m3;Encircle in maximum Under the premise of pushing up temperature identical (1270 DEG C), the existing hot-blast stove manually controlled, dome temperature maximum fluctuation value is 10 DEG C, temperature The number that degree is reduced more than 3 DEG C is 9 times, and gas consumption amount is 178118m3

Claims (10)

1. a kind of Combustion of Hot Air Furnace automatic control system, including fuel flow rate detection device that fuel outlet (13) is equipped with (132) and fuel control valve (134), the combustion air current amount detecting device (211) and combustion-supporting controlled atmosphere that combustion-supporting tracheae (21) is equipped with Save valve (212), which is characterized in that further include fuel analysis instrument (133), temperature sensing is equipped in hot-blast stove (3) upper inside wall Device (31), fuel outlet (13) and combustion-supporting tracheae (21) are connected to burner (2), and burner (2) connects with hot-blast stove (3) Logical, described temperature sensor (31), fuel flow rate detection device (132), combustion air current amount detecting device (211) and fuel point Analyzer (133) is connect with controller input terminal, controller output end and fuel control valve (134) and helps gas control valve (212) it connects.
2. a kind of Combustion of Hot Air Furnace automatic control system according to claim 1, which is characterized in that along fuel conveying direction On, fuel analysis instrument (133), fuel flow rate are equipped on the fuel outlet (13) that one end is connected to burner (2) entrance successively Detection device (132) and fuel control valve (134), fuel outlet (13) other end and gas chamber (1) outlet, the coal Gas holder (1) entrance is connected to fuel inlet pipe (12).
3. a kind of Combustion of Hot Air Furnace automatic control system according to claim 2, which is characterized in that further include fuel pressure Detection device (131), along fuel flowing direction, the fuel pressure detection device (131) is located at gas chamber (1) outlet On fuel outlet (13) at place and burner inlet, the fuel pressure detection device (131) and controller input terminal Connection.
4. according to a kind of Combustion of Hot Air Furnace automatic control system of claim 1-3 any one of them, which is characterized in that further include Valve opening sensor (135) is set on the combustion-supporting tracheae (21) for helping gas control valve (212) to be connected to burner (2) entrance There is the valve opening sensor (135), in the fuel outlet that fuel control valve (134) is connected to burner (2) entrance (13) the valve opening sensor (135) also is provided on, valve opening sensor (135) is connect with controller input terminal.
5. according to a kind of Combustion of Hot Air Furnace automatic control system of claim 1-3 any one of them, which is characterized in that with hot wind The flue gas leading (32) of stove (3) connection is equipped with oxygen conten analyser (321) and temperature sensor (31), the temperature sensor (31) it is connect with controller input terminal with oxygen conten analyser (321).
6. a kind of Combustion of Hot Air Furnace automatic control system according to claim 5, which is characterized in that hot-blast stove (3) entrance With burner (2) outlet, multiple temperature sensors (31) are evenly distributed in hot-blast stove (3) upper inside wall, temperature passes Sensor (31) is connect with controller input terminal.
7. a kind of Combustion of Hot Air Furnace automatic control system according to claim 5, which is characterized in that the combustion air current Amount detecting device (211) and gas control valve (212) is helped to be respectively positioned on combustion-supporting tracheae (21), combustion-supporting tracheae (21) one end with it is combustion-supporting Gas holder is connected to, and combustion-supporting tracheae (21) other end is connected to burner (2) entrance.
8. a kind of Combustion of Hot Air Furnace autocontrol method, it is characterised in that:
A, a kind of Combustion of Hot Air Furnace automatic control system described in claim 1 is built, fuel analysis instrument (133), fuel are opened The fuel element and calorific value data of analyzer (133) detection are real-time transmitted to controller, and controller is real-time according to air-fuel ratio model The ideal ratio x for determining full combustion of fuel required fuel flow rate and combustion air current amount is calculated, it is special according to the flow of valve Property, so that it is determined that fuel control valve (134) and helping the opening ratio z of gas control valve (212);
B, it burns initial stage:
B1, it first opens and helps gas control valve (212), increase combustion air current amount, aperture 10%-15%, be delayed 5-10s;Root again According to fuel control valve (134) and the opening ratio z of gas control valve (212), controller is helped to adjust opening for fuel control valve (134) Degree, be delayed 5-10s;
B2, increase help gas control valve (212) aperture, and at the same time, the opening ratio z being calculated according to controller is adjusted in real time Fuel control valve (134) aperture is saved, it is maximum until helping gas control valve (212) aperture or fuel control valve (134) aperture to reach When until;
Flue gas oxygen content is adjusted:
Simultaneously with the above, the temperature sensor (31) on hot-blast stove (3) detects hot-blast stove (3) dome temperature and is transferred to control Device processed, compared with the dome temperature of setting, during not up to expected dome temperature, detection flue gas oxygen content is y, preferably Flue gas oxygen content ranging from a-b;
If y<(a+b)/2 fuel control valve (134) aperture, is then turned down, while controller adjusts combustion-supporting controlled atmosphere according to opening ratio z Save valve (212) aperture;Or increase and help gas control valve (212) aperture, while controller adjusts fuel adjusting according to opening ratio z Valve (134) aperture;If y>(a+b)/2 it, then turns down and gas control valve (212) aperture or aperture is helped to remain unchanged, control simultaneously Device adjusts fuel control valve (134) aperture according to opening ratio z;Or increase fuel control valve (134) aperture, while controller root According to opening ratio z, while adjusting and helping gas control valve (212) aperture;
C, the accumulation of heat phase
After reaching expected dome temperature, into storage heater, in the case where ensureing that dome temperature is constant, examined according to controller Flue-gas temperature is surveyed, the speed for the flue gas temperature rise rate being calculated helps gas control valve (212) aperture or fuel adjusting to adjust Valve (134) aperture turns down fuel control valve (134) aperture, while controller is adjusted according to opening ratio z if temperature rise rate is fast Section helps gas control valve (212) aperture;Then it turns down again and helps gas control valve (212) aperture, while controller is according to opening ratio Z adjusts fuel control valve (134) aperture;If temperature rise rate is slow, increase helps gas control valve (212) aperture, controls simultaneously Device adjusts fuel control valve (134) aperture according to opening ratio z;Then increase fuel control valve (134) aperture again, control simultaneously Device helps gas control valve (212) aperture according to opening ratio z, adjusting;So that flue-gas temperature reaches set temperature value;
The accumulation of heat phase is using flue-gas temperature and flue gas temperature rise rate as the tune for helping gas control valve (212), fuel control valve (134) Index is controlled, while with the subtle control valve aperture of flue gas oxygen content, regulative mode is the same as step C;
D, the accumulation of heat period of saturation
After flue-gas temperature reaches setting value, into the accumulation of heat period of saturation, it is gradual that controller adjusts fuel control valve (134) aperture Reduce, while controller, according to opening ratio z, adjusting helps gas control valve (212) aperture;Controller is continued to vault simultaneously The control of temperature, until burning terminates.
9. a kind of Combustion of Hot Air Furnace autocontrol method according to claim 8, it is characterised in that:Fuel flow rate and combustion-supporting The ideal ratio of throughput is;
Wherein:
Vo2, the oxygen purity in combustion-supporting gas;
b0——H2Quality-volumetric concentration;
b1--- quality-volumetric concentration of CO;
b2——CH4Quality-volumetric concentration;
a3——CnHmVolumetric concentration;
b4——O2Quality-volumetric concentration.
10. a kind of Combustion of Hot Air Furnace autocontrol method according to claim 8, it is characterised in that:Adjust combustion-supporting controlled atmosphere After saving valve (212) aperture, the actual flow for the combustion-supporting gas that controller is detected by combustion air current amount detecting device (211), control Device processed calculates the ideal for determining full combustion of fuel required fuel flow rate and combustion air current amount according to air-fuel ratio model in real time Ratio x, then further according to the discharge characteristic of valve, so that it is determined that the aperture of fuel control valve (134), adjusts fuel control valve (134);
After adjusting fuel control valve (134) aperture, the reality for the fuel that controller is detected by fuel flow rate detection device (132) Border flow, controller calculate according to air-fuel ratio model and determine the required fuel flow rate of full combustion of fuel and combustion air current in real time The ideal ratio x of amount, then further according to the discharge characteristic of valve, so that it is determined that helping the aperture of gas control valve (212), adjusting helps Gas control valve (212).
CN201810331809.0A 2018-04-13 2018-04-13 A kind of Combustion of Hot Air Furnace automatic control system and its control method Pending CN108458486A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110274395A (en) * 2019-06-28 2019-09-24 华帝股份有限公司 A kind of control method and gas heater of adaptive fully pre-mixing gas combustion water heater
CN110319692A (en) * 2019-05-13 2019-10-11 杭州虹妍服饰有限公司 A kind of Casting Equipment
CN110553280A (en) * 2019-09-11 2019-12-10 兖矿集团有限公司 Control method and system for hot air stove and storage medium
WO2020177302A1 (en) * 2019-03-04 2020-09-10 中冶南方工程技术有限公司 Method for utilizing cold-air heat of blast furnace axial flow blower, and hot blast stove system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020177302A1 (en) * 2019-03-04 2020-09-10 中冶南方工程技术有限公司 Method for utilizing cold-air heat of blast furnace axial flow blower, and hot blast stove system
CN110319692A (en) * 2019-05-13 2019-10-11 杭州虹妍服饰有限公司 A kind of Casting Equipment
CN110319692B (en) * 2019-05-13 2020-11-24 青岛四方机车车辆铸钢有限公司 Casting equipment
CN110274395A (en) * 2019-06-28 2019-09-24 华帝股份有限公司 A kind of control method and gas heater of adaptive fully pre-mixing gas combustion water heater
CN110553280A (en) * 2019-09-11 2019-12-10 兖矿集团有限公司 Control method and system for hot air stove and storage medium
CN110553280B (en) * 2019-09-11 2020-12-15 兖矿集团有限公司 Control method and system for hot air stove and storage medium

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