CN103499101A - Method and device for regulating temperature of hearth of ternary ignition furnace - Google Patents
Method and device for regulating temperature of hearth of ternary ignition furnace Download PDFInfo
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Abstract
The invention discloses a method and device for regulating the temperature of a hearth of a ternary ignition furnace, and relates to the technical field of sintering and ignition. The method includes the steps of firstly, obtaining current state parameters of the ternary ignition furnace and preset parameters; secondly, calculating the target flow of coal gas which needs to enter the hearth of the ternary ignition furnace through a thermal engineering mathematical model according to the current state parameters and the preset parameters; thirdly, conducting flow closed-loop control on a coal gas regulating valve of the ternary ignition furnace according to the calculated target flow of the coal gas so that the regulation of the temperature of the hearth of the ternary ignition furnace can be achieved, wherein the preset parameters include a preset target temperature of the hearth of the ternary ignition furnace. According to the method and device, the target flow of the coal gas which needs to enter the hearth so as to enable the temperature of the hearth of the ternary ignition furnace to reach the preset target temperature is calculated through the thermal engineering mathematical model, only the closed-loop control needs to be directly conducted on the flow of the coal gas, and therefore the response time for enabling the temperature of the hearth to reach the preset target temperature is shortened, and the hysteresis is reduced.
Description
Technical field
The present invention relates to the sintering ignition technical field, particularly a kind of Ternary Point stove fire box temperature control method and device.
Background technology
Sintering process is the important step in smelting technique, for being difficult for the powdery mixed material of smelting or being called compound, is sintered to the sintering deposit that is easy to smelting.Igniting is a very important link in the sintering process flow process.Sintering process is from the solid fuel igniting on compound top layer, after the raw materials for sintering mixed is evenly distributed on chassis, the hot strip flame provided by ignition furnace, the raw materials for sintering top layer is heated to above to solid-fuelled burning-point and takes fire, more sufficient oxygen amount is provided and impels sintering process to carry out rapidly downwards by the air exhauster exhausting.
The sintering ignition system requires ignition furnace to meet following three conditions:
(1) enough firing temperatures and ignition intensity are arranged.
(2) the suitable high temperature retention time.
(3) along chassis length and width, evenly light a fire.
The quality of ignition quality will directly have influence on that can sintering process carry out smoothly and the intensity of sintering deposit.Firing temperature is too low, and the heat of top layer sintering feed savings very little, is not enough to create clean-burning condition to lower floor, can't make the bed of material reach sintering strength, will produce a large amount of returning mine.Otherwise firing temperature too high or duration of ignition is long can cause again the superfusion of sintering feed top layer affect air-flow to pass through, reduce bed permeability, reduce vertical sintering speed, thereby cause productivity ratio to reduce, make the FeO content rising of sintering deposit simultaneously, reducing property degenerates.
In addition, according to statistics, the process energy consumption of sintering plant accounts for 10% left and right of steel and iron industry total energy consumption, and the sintering ignition energy consumption accounts for the 7%-8% of sintering circuit energy consumption.Therefore, the consumption of igniter fuel also directly has influence on the height of sintering comprehensive energy consumption.
Ignition furnace, according to the kind difference of igniter fuel, can be divided into combustion type ignition furnace and fuel oil type ignition furnace.According to the difference of igniter fuel kind number, can be divided into binary ignition furnace and Ternary Point stove.
Patent publication No. is: 101984322A, patent name is: temperature-controlled process and the system of hot blast when cold wind transition when during a kind of sintering ignition furnace cold-hot wind transition, the patent of temperature-controlled process and system discloses a kind of sintering ignition furnace combustion air from startup is normal operating condition.After the method has mainly been considered the hysteresis quality and combustion air temperature rising of thermocouple temperature measurement signal, the problem that required coal gas amount reduces.Its control method is detected value and the setting value by repeatedly comparing fire box temperature, and the coal gas amount is regulated, and its essence is still conventional closed loop control method, has the problem that valve event is frequent, system response time is long.Patent publication No. is: 201514580U, patent name is: the patent of the composite control apparatus of ignition furnace of sintering machine is mainly set forth the control of ignition furnace of sintering machine from the hardware configuration aspect, the employing industrial computer has been proposed, programmable logic controller (PLC) PLC, temperature thermocouple, and the pressure sensor, flow sensor and the flow control valve that are arranged on the space gas pipeline are regulated the ignition furnace fire box temperature.Patent publication No. is: 101739004A, patent name is: the patent of the Fuzzy-PID multiplex control system of ignition furnace of sintering machine, its basic control principle, for the difference size with the feedback valve opening by the judgement valve opening, selects to adopt Fuzzy control strategy or PID control strategy.In fact also be that ratio by fuel metering amount and air mass flow realizes the control to firing temperature, also can have the problem that valve event is frequent, system responses lags behind.
For the Ternary Point stove, the Ternary Point stove of prior art is when production run, and it is substantially all to adopt the temperature cascade control mode that the ignition furnace fire box temperature is controlled automatically, take fire box temperature as target configuration temperature closed loop control mode, is master selector; Take two kinds of gas flows respectively as target configuration flow close-loop control mode, be two secondary controllers, after being distributed, the output of master selector as the output of two secondary controllers, is as shown in Figure 1 typical Ternary Point stove fire box temperature tandem control principle block diagram.(it is the input of the output of previous master selector as follow-up secondary controller that so-called tandem is controlled).
The effect of distributor is can be by the pro-rata of two kinds of gas flows, or fixing wherein a kind of adjustings another, specifically can be manually definite according to combustion case by operating personnel.
Temperature control is all generally to lag behind large and is nonlinear control, and flow-control is reacted comparatively fast usually.Therefore in the ignition furnace temperature is controlled, the control mode of adjuster 1 substantially all adopts PID to control, i.e. Proportional ratio, Integral integration, Differential differential control mode.Or adopt Fuzzy to control the control mode in conjunction with PID.
Adjusting when in Fig. 1, ring adjuster 21, adjuster 22 are changes in flow rate, belong to accurate adjustment, and adjusting when outer shroud adjuster 1 is variations in temperature, belong to coarse adjustment.This control model be take fire box temperature T_sv as target, the actual temperature TI that thermocouple detects is as negative feedback links, both compare and obtain deviation delta E1, deviation delta E1 is through 1 output of adjuster in control system, after distributor as two kinds of coal gas target flows, the target flow of two kinds of coal gas relatively obtains corresponding deviation delta E21, Δ E22 with the actual gas flow that corresponding flowmeter detects respectively, deviation is the aperture control signal as gas regulator through 21,22 outputs of adjuster in control system respectively, thus difference control combustion gas flow size.
In production process, when gas pressure fluctuation or other factors cause the gas flow fluctuation, corresponding flow regulator can be carried out in time and adjust output and again change the gas flow control valve opening, guarantees the stable of target flow; When Flow-rate adjustment reaction not prompt enough and temporary transient unbalance or while because of other external factor, as sintering machine velocity variations, bed permeability variation etc., causing variations in temperature, the thermoregulator 1 of outer shroud can be carried out in time to adjust to export and again change the coal gas target flow, control system is adjusted repeatedly, understands the fast as far as possible new stable state that reaches.For gas flow adjuster 21, 22, adopt traditional PI to regulate and can well realize regulatory function, but adjustment is relatively slow and specific discharge is regulated complicated process, therefore no matter adjuster 1 adopts PID adjuster or fuzzy self-adaption adjuster or other control algolithm, adjuster 1 all needs by repeatedly comparing fire box temperature measured value and setting value, constantly change the aperture of gas flow control valve, make the burner hearth actual temperature constantly approach the goal-setting temperature, the action of ordinary circumstance control valve can be more frequent, it is oversize that fire box temperature reaches design temperature system response time, hysteresis quality is too large.
Air mass flow need to be according to the proportional adjusting of gas flow, concrete ratio is definite by coal gas and air reaction, and as shown in Figure 2, air mass flow closed-loop adjustment and gas flow closed-loop adjustment are just the same for control principle drawing, just increase proportional component, i.e. a multiplier.When coal gas target flow F_sv21 or F_sv22 stablize, air target flow F_sv3 also can correspondingly stablize, and the actual proportioning of air gas is more reasonable.
The output of Ternary Point stove thermoregulator is respectively as the target specified rate of two flow closed-loop controls after assignment of traffic, and corresponding flow control valve is controlled respectively in the output of flow regulator, thereby changes gas flow, reaches temperature controlled purpose.
In sum, the ignition furnace temperature control method all needs by repeatedly comparing fire box temperature measured value and setting value at present, by means such as PID control valve or fuzzy controls, constantly change the aperture of gas flow control valve, make the burner hearth actual temperature constantly approach the goal-setting temperature, but all can cause the control valve frequent movement, it is oversize that fire box temperature reaches response time of design temperature, hysteresis quality is too large, therefore in actual the use, be the stability of retentive control, substantially all be to adopt flow control mode, directly set the target flow of flow control valve, produce when unstable and need the artificial frequent coal gas target flow of adjusting, thereby increase operating personnel's labour intensity, even can affect output and the quality of sintering deposit.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is: how to shorten the response time that fire box temperature reaches the target setting temperature, to shorten lag time.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of Ternary Point stove fire box temperature control method, said method comprising the steps of:
S1: obtain current state parameter and the parameter preset of Ternary Point stove, described parameter preset comprises: the goal-selling temperature of Ternary Point stove burner hearth;
S2: need to pass into the coal gas target flow in described Ternary Point stove burner hearth according to described current state parameter and parameter preset by thermal technology's calculated with mathematical model, the goal-selling temperature that described thermal technology's Mathematical Modeling is described Ternary Point stove burner hearth and the corresponding relation that need to pass into the coal gas target flow in described Ternary Point stove burner hearth;
S3: according to the coal gas target flow calculated, the gas regulator on described Ternary Point stove is carried out to the flow closed-loop control, to realize the adjusting to described Ternary Point stove fire box temperature.
Wherein, further comprising the steps of between step S1 and S2:
The current state parameter obtained is carried out to pretreatment.
Wherein, described pretreatment comprises: at least one in Filtering and smoothing.
Wherein, described state parameter comprises: the environment temperature T at the thickness of feed layer H in burner hearth, place, burner hearth place
ring, the first gas temperature T
coal 1, required the first air of completing combustion the first coal gas temperature T
empty 1, the second gas temperature T
coal 2temperature T with required the second air of completing combustion the second coal gas
empty 2, described parameter preset also comprises: ignition furnace burner hearth area S
stove, sintering pallet bottom to the height of furnace roof is H
0, flue gas average specific heat at constant pressure C in burner hearth
cigarette, ignition furnace calorific intensity coefficient ε, the first coal gas low heat value q
coal 1, the second coal gas low heat value q
coal 2, the fiducial temperature T of mark during state
0, the first air and the first coal gas proportionality coefficient k
1; The proportionality coefficient k2 of the second air and the second coal gas, the first coal gas average specific heat at constant pressure C
coal 1, the second coal gas average specific heat at constant pressure C
coal 2, the first air average specific heat at constant pressure C
empty 1average specific heat at constant pressure C with the second air
empty 2.
Wherein, described thermal technology's Mathematical Modeling is:
Wherein, F
coal 1it is the first coal gas target flow value; F
coal 2it is the second coal gas target flow value; T
stovegoal-selling temperature for Ternary Point stove burner hearth.
Wherein, described parameter preset also comprises: need fixing coal gas label and the preset flow that needs fixing coal gas;
In step S2, the coal gas target flow that calculating need to pass in described Ternary Point stove burner hearth further comprises:
Judge whether to fix the flow of the first coal gas according to the coal gas label received, if, described the first coal gas target flow is fixed as to described preset flow, and need to passes into the second coal gas target flow F in described Ternary Point stove burner hearth by described thermal technology's calculated with mathematical model
coal 2, otherwise, described the second coal gas target flow is fixed as to described preset flow, and need to passes into the first coal gas target flow F in described Ternary Point stove burner hearth by described thermal technology's calculated with mathematical model
coal 1.
Wherein, described current state parameter also comprises: the Current Temperatures T of described Ternary Point stove burner hearth;
Between step S2 and S3, also comprise:
S201: judge whether to meet the goal-selling temperature T of fire box temperature in stable state and burner hearth
stovebe not less than the first goal-selling temperature threshold with the absolute value of the difference of Current Temperatures T, if, performing step S202, otherwise directly perform step S3, described stable state is for to be less than the second goal-selling temperature threshold in Preset Time internal furnace range of temperature;
S202: judge whether to fix the flow of the first coal gas according to described coal gas label, if by fine setting thermal technology calculated with mathematical model, need to pass into the second coal gas fine setting flow F in described Ternary Point stove burner hearth
coal 2', and execution step S203; Otherwise, by fine setting thermal technology calculated with mathematical model, need to pass into the first coal gas fine setting flow F in described Ternary Point stove burner hearth
coal 1', and execution step S204;
S203: by described the second gas flow F
coal 2with the second coal gas fine setting flow F
coal 2' additive value as the coal gas target flow calculated, and directly perform step S3;
S204: by described the first gas flow F
coal 1with the first coal gas fine setting flow F
coal 1' additive value as the coal gas target flow calculated, and directly perform step S3.
Wherein, calculate described the second coal gas fine setting flow F
coal 2in ' time, fine setting thermal technology Mathematical Modeling is:
Calculate described the first coal gas fine setting flow F
coal 1in ' time, fine setting thermal technology Mathematical Modeling is:
Wherein, the span of described Preset Time is 1～4 minute, and the span of described the second goal-selling temperature threshold is 0.5～5 ℃.
The invention also discloses a kind of Ternary Point stove fire box temperature adjusting device, described device comprises:
Parameter acquisition module, for the current state parameter and the parameter preset that obtain the Ternary Point stove, described parameter preset comprises: the goal-selling temperature of Ternary Point stove burner hearth;
The target flow computing module, for according to described current state parameter and parameter preset, by thermal technology's calculated with mathematical model, passing into the coal gas target flow in described Ternary Point stove burner hearth, the goal-selling temperature that described thermal technology's Mathematical Modeling is described Ternary Point stove burner hearth and the corresponding relation that need to pass into the coal gas target flow in described Ternary Point stove burner hearth;
Closed loop control module, carry out the flow closed-loop control for the coal gas target flow according to calculating to the gas regulator on described Ternary Point stove, to realize the adjusting to described Ternary Point stove fire box temperature.
(3) beneficial effect
The present invention calculates ternary stove burner hearth by thermal technology's Mathematical Modeling and reaches the required coal gas target flow passed into of goal-selling temperature, only need directly gas flow to be carried out to closed-loop control, shorten the response time that fire box temperature reaches the goal-selling temperature, reduced hysteresis quality.
The accompanying drawing explanation
Fig. 1 is the Ternary Point stove fire box temperature control principle block diagram of prior art;
Fig. 2 is prior art Air flow Automatic Control Theory block diagram;
Fig. 3 is the flow chart of the Ternary Point stove fire box temperature control method of one embodiment of the present invention;
Fig. 4 is the flow chart of the Ternary Point stove fire box temperature control method of an embodiment of the present invention;
Fig. 5 is the control principle block diagram that the control method shown in Fig. 4 is corresponding;
Fig. 6 is the structured flowchart of the Ternary Point stove fire box temperature adjusting device of one embodiment of the present invention.
The specific embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for the present invention is described, but are not used for limiting the scope of the invention.
Fig. 3 is the flow chart of the Ternary Point stove fire box temperature control method of one embodiment of the present invention; With reference to Fig. 1, said method comprising the steps of:
S1: obtain current state parameter and the parameter preset of Ternary Point stove, described parameter preset comprises: the goal-selling temperature of Ternary Point stove burner hearth;
S2: need to pass into the coal gas target flow in described Ternary Point stove burner hearth according to described current state parameter and parameter preset by thermal technology's calculated with mathematical model, the goal-selling temperature that described thermal technology's Mathematical Modeling is described Ternary Point stove burner hearth and the corresponding relation that need to pass into the coal gas target flow in described Ternary Point stove burner hearth;
S3: according to the coal gas target flow calculated, the gas regulator on described Ternary Point stove is carried out to the flow closed-loop control, to realize the adjusting to described Ternary Point stove fire box temperature.
Present embodiment is calculated ternary stove burner hearth by thermal technology's Mathematical Modeling and is reached the required coal gas target flow passed into of goal-selling temperature, only need directly gas flow to be carried out to closed-loop control, shorten the response time that fire box temperature reaches the target setting temperature, reduced hysteresis quality; After the coal gas target flow that calculating need to pass into, directly control the gas regulator aperture, stable in the target gas flow a period of time that makes to calculate by this mode, be unlikely frequent fluctuation, thereby cause the target specified rate fluctuation of gas flow closed-loop control frequent, cause system oscillation.
For the data fluctuations that reduces state parameter and the impact of abnormal data, preferably, further comprising the steps of between step S1 and S2: that the current state parameter obtained is carried out to pretreatment.
For guaranteeing pretreated effect, preferably, described pretreatment comprises: at least one in Filtering and smoothing.
For guaranteeing the counting accuracy of thermal technology's Mathematical Modeling, in present embodiment, preferably, described state parameter comprises: the environment temperature T at the thickness of feed layer H in burner hearth, place, burner hearth place
ring, the first gas temperature T
coal 1, required the first air of completing combustion the first coal gas temperature T
empty 1, the second gas temperature T
coal 2temperature T with required the second air of completing combustion the second coal gas
empty 2, described parameter preset also comprises: ignition furnace burner hearth area S
stove, sintering pallet bottom to the height of furnace roof is H
0, flue gas average specific heat at constant pressure C in burner hearth
cigarette, ignition furnace calorific intensity coefficient ε, the first coal gas low heat value q
coal 1, the second coal gas low heat value q
coal 2, the fiducial temperature T of mark during state
0, the first air and the first coal gas proportionality coefficient k
1; The proportionality coefficient k2 of the second air and the second coal gas, the first coal gas average specific heat at constant pressure C
coal 1, the second coal gas average specific heat at constant pressure C
coal 2, the first air average specific heat at constant pressure C
empty 1average specific heat at constant pressure C with the second air
empty 2.
According to thermal technology's mathematical derivation, preferably, described thermal technology's Mathematical Modeling is:
Wherein, F
coal 1it is the first coal gas target flow value; F
coal 2it is the second coal gas target flow value; T
stovegoal-selling temperature for Ternary Point stove burner hearth.
Above-mentioned thermal technology's mathematical derivation process is: at first, according to the design experiences of ignition furnace, ignition furnace needs the heat fed to mean with following formula in the unit interval,
Q
supply=V
stove* (T
stove-T
ring) * C
cigarette* ε (1)
Wherein, V
stovefor ignition furnace furnace cavity volume, unit is m
3, for a certain set ignition furnace, this parameter can have along with the variation of the bed depth on sintering pallet small variation; V
stove=S
stove* (H
0-H), S wherein
stovefor constant, mean ignition furnace burner hearth area, unit is m
2; H
0for definite value, mean the height of sintering pallet bottom to furnace roof, unit is m, and H is bed depth on chassis, and unit is m, can obtain by sintering machine head material-level detecting device; T
stovefor the goal-selling temperature that burner hearth will be controlled, unit is ℃ to be set as required by operating personnel; T
ringfor burner hearth place place environment temperature, unit is ℃ to know by detection means; C
cigarettefor constant, mean flue gas average specific heat at constant pressure in burner hearth, unit is kJ/ (m
3℃); ε is the calorific intensity coefficient, and to a certain set ignition furnace, this parameter is also a constant; Q
supplyfor the temperature in the unit interval internal furnace reaches the heat that the goal-selling temperature need to feed, the expenditure heats such as heat that on this heat and chassis, material heats up, heat radiation, main exhauster exhausting flue gas are taken away on every side form thermal balance, the heat that the heat of unit interval internal consumption brings with fuel gas buring substantially equates, so heat supply need to be carried out continuously.
Secondly, establish Q
supply=Q
empty+ Q
coal+ Q
change, Q
supplyfor feeding the heat in the ignition furnace burner hearth in the unit interval, unit is kJ/h.It comprises the physical thermal Q that air is brought into
empty, the physical thermal Q that coal gas is brought into
coalthe chemical reaction heat Q brought into coal gas
change.Outside Ternary Point stove deacration medium, generic point stove fuel can consist of the first coal gas and the second coal gas, therefore Q
supply=Q
for 1+ Q
for 2, the datum mark that the standard state (101325Pa, 273.15K) of take is calculated as heat can obtain following calculating formula:
Q
empty 1=
c empty 1* F
empty 1* (T
empty 1-T
0) (2)
Q
coal 1=C
coal 1* F
coal 1* (T
coal 1-T
0) (3)
Q
change 1=F
coal 1* q
coal 1(4)
Wherein, Q
empty 1for the physical thermal that the required air of completing combustion the first coal gas is brought into, unit is kJ/h; Q
coal 1be the physical thermal that the first coal gas is brought into, unit is kJ/h; Q
change 1be the chemical reaction heat that the first coal gas is brought into, unit is kJ/h; C
empty 1and C
coal 1be respectively the average specific heat at constant pressure of the first air and coal gas, unit is kJ/ (m
3k), can look into technical manual knows; F
empty 1and F
coal 1be respectively the actual flow of the first air and the first coal gas, m
3/ h, also can be used as the target flow regulated value, and wherein the pass of air mass flow and gas flow is F
empty 1=k * F
coal 1, k is the air gas proportionality coefficient, by fuel characteristic, is determined; T
empty 1and T
coal 1be respectively the temperature that the first air and the first coal gas enter Ternary Point stove burner hearth, unit is K, by detection means, knows; T
0for constant, the fiducial temperature while meaning the mark state, 0 ℃.Q
coal 1be the low heat value of the first coal gas, kJ/m
3, by detection means, know.
In the ignition furnace actual motion, generally can guarantee that air capacity is slightly excessive, so chemical reaction heat to press gas meter proper, through type (2), (3) and (4) can obtain:
In like manner can obtain
Simultaneous formula 5 and formula 6, can obtain
Finally, simultaneous formula 1 and formula 7, get ignition furnace burner hearth target temperature T
stovefor independent variable, Gas Flow value F
coal 1for dependent variable, can obtain thermal technology's Mathematical Modeling and be:
Because the flow of adjusting two kinds of coal gas can make system simultaneously, unstability appears, so in present embodiment, adopt fixing a kind of coal gas, adjust the mode of another kind of coal gas, can reduce the unstability of system like this, the adjusting time that reaches target temperature can be shorter, and can reduce the action frequency of valve, in addition, owing to generally having a kind of in two kinds of coal gas, be abundant or cheap, for cost-saving, preferably, described parameter preset also comprises: receive the coal gas label (for distinguishing the first coal gas and the second coal gas) that needs firm discharge and the preset flow that needs fixing coal gas,
In step S2, the coal gas target flow that calculating need to pass in described Ternary Point stove burner hearth further comprises:
Judge whether to fix the flow of the first coal gas according to the coal gas label received, if, described the first coal gas target flow is fixed as to described preset flow (being about to described preset flow as described the first coal gas target flow), and need to passes into the second gas flow F in described Ternary Point stove burner hearth by described thermal technology's calculated with mathematical model
coal 2otherwise, described the second coal gas target flow is fixed as to described preset flow (being about to described preset flow as described the second coal gas target flow), and need to passes into the first gas flow F in described Ternary Point stove burner hearth by described thermal technology's calculated with mathematical model
coal 1.
Fix the target flow of the second coal gas, calculating need to pass into the first gas flow F in described Ternary Point stove burner hearth
coal 1the time, by calculating with following formula (8),
Fix the target flow of the first coal gas, calculating need to pass into the second gas flow F in described Ternary Point stove burner hearth
coal 2the time, by calculating with following formula (9),
For the specified point stove, remove Ternary Point stove goal-selling temperature T in formula (8), (9)
stovewith chassis material loading layer thickness H be outside real-time change, T
coal, T
empty, T
ringalthough be real-time data collection but change within a certain period of time littlely, other all belongs to constant, can simply think that these data are constant, formula (8) (9) is curvilinear function one time.
From formula (8), fix the second coal gas target flow F
coal 2, the first coal gas target flow value F
coal 1with Ternary Point stove fire box temperature T
stovebecome once linear relationship; From formula (9), fix the target flow F of the first coal gas
coal 1, the second coal gas target flow value F
coal 2with Ternary Point stove burner hearth goal-selling temperature T
stovebecome once linear relationship.
In the ignition furnace actual moving process, because outside factors, impact as the gas permeability of compound on chassis in the Ternary Point stove, main exhauster exhausting air quantity, machine speed etc., can cause the absolute value of difference of goal-selling temperature and actual furnace temperature in allowing outside the departure scope, preferably, described current state parameter also comprises: the Current Temperatures T of described Ternary Point stove burner hearth;
Between step S2 and S3, also comprise:
S201: judge whether to meet the goal-selling temperature T of fire box temperature in stable state and burner hearth
stovebe not less than the first goal-selling temperature threshold with the absolute value of the difference of Current Temperatures T, if, performing step S202, otherwise directly perform step S3, described stable state is for to be less than the second goal-selling temperature threshold in Preset Time internal furnace range of temperature;
S202: judge whether to fix the flow of the first coal gas according to described coal gas label, if by fine setting thermal technology calculated with mathematical model, need to pass into the second coal gas fine setting flow F in described Ternary Point stove burner hearth
coal 2', and execution step S203; Otherwise, by fine setting thermal technology calculated with mathematical model, need to pass into the first coal gas fine setting flow F in described Ternary Point stove burner hearth
coal 1', and execution step S204;
S203: by described the second gas flow F
coal 2with the second coal gas fine setting flow F
coal 2' additive value as the coal gas target flow calculated, and directly perform step S3;
S204: by described the first gas flow F
coal 1with the first coal gas fine setting flow F
coal 1' additive value as the coal gas target flow calculated, and directly perform step S3.
According to the knowwhy of thermal technology's Mathematical Modeling, preferably, calculate described the first coal gas fine setting flow F
coal 1in ' time, fine setting thermal technology Mathematical Modeling is pressed following formula (10) and is calculated:
Calculate described the second coal gas fine setting flow F
coal 2in ' time, fine setting thermal technology Mathematical Modeling is pressed following formula (11) and is calculated:
In present embodiment, preferably, the span of described Preset Time is 1～4 minute, as value is 2 minutes; The span of described the second goal-selling temperature threshold is 0.5～5 ℃, and as value is 1 ℃, value is less, shows the requirement of control accuracy higher.
Embodiment
Below with a specific embodiment, the present invention is described, but does not limit protection scope of the present invention.With reference to Fig. 4, the method for the present embodiment comprises the following steps:
Step 101: program is calculated and is started.
Step 102: read relevant parameter preset, described parameter preset comprises: the goal-selling temperature T
stove, burner hearth area S
stove, pallet bottom is to the height H of furnace roof
0, flue gas average specific heat at constant pressure C in burner hearth
cigarette, coal gas average specific heat at constant pressure C
coal 1and C
coal 2, air average specific heat at constant pressure C
empty 1and C
empty 2, the low heat value q of coal gas
coal 1and q
coal 2, ignition furnace calorific intensity coefficient ε, air gas proportionality coefficient k
1and k
2, needing fixing coal gas label and needing the preset flow of fixing coal gas (is F while fixing the first coal gas
coal 1, while fixing the second coal gas, be F
coal 2).Wherein, T
stove, k
1, k
2and F
coal 1(or F
coal 2) by operating personnel, set as required, what be different from other constant is that these parameters may have adjustment according to different operating modes, therefore all can be used as constant.
Step 103: read the current state parameter value, described state parameter comprises: thickness of feed layer H, fire box temperature T, air themperature T in burner hearth
empty 1, T
empty 2, gas temperature T
coal 1, T
coal 2, environment temperature T
ring.
Step 104: current state parameter is carried out to pretreatment.For the variable of real-time detection, be the impact of Reduce variation and abnormal data, need do filtering, smoothing processing operation to data.
Step 105: the flow that judges whether to select to fix the first coal gas according to described coal gas label.
Step 106: be using described preset flow as described the first coal gas target flow, and to calculate the second gas flow F that need to pass into according to formula (9) if judgment result is that
coal 2, and perform step 108.
Step 107: if the determination result is NO, using described preset flow as described the second coal gas target flow, and calculate the first gas flow F that need to pass into according to formula (8)
coal 1, and perform step 108.
Step 108: judge whether to enable fine setting calculated with mathematical model fine setting gas flow.Determination methods is: the goal-selling temperature T of the stable and burner hearth of fire box temperature T
stovebe not less than the first goal-selling temperature threshold with the absolute value of the difference of Current Temperatures T; If NO, perform step 109, perform step 112 if yes.
Step 109: judge whether to select to fix the flow of the first coal gas according to described coal gas label, perform step if yes 110, otherwise perform step 111.
Step 110: output F
coal 2as the target input of the adjuster of the second coal gas, carry out the flow closed-loop adjustment of the second coal gas, EP (end of program) after completing.
Step 111: output F
coal 1as the target input of the adjuster of the first coal gas, carry out the flow closed-loop adjustment of the first coal gas, EP (end of program) after completing.
Step 112: judge whether to select to fix the flow of the first coal gas according to described coal gas label, perform step if yes 113, otherwise perform step 115.
Step 113: according to formula (11), calculate F
coal 2'.
Step 114: output F
coal 2+ F
coal 2' as the target input of the adjuster of the second coal gas, carry out the flow closed-loop adjustment of the second coal gas, EP (end of program) after completing.
Step 115: according to formula (10), calculate F
coal 1'.
Step 116: output F
coal 1+ F
coal 1' as the target input of the adjuster of the first coal gas, carry out the flow closed-loop adjustment of the first coal gas, EP (end of program) after completing.
The ignition furnace fire box temperature control method of the present embodiment, after coal gas (the first coal gas or the second coal gas) target flow is determined, complete the gas flow closed-loop control, this closed-loop control generally can enter new stable state by last stable state in actual motion within the short time in several seconds, thereby reaches the rapidity of response.Now the gas flow control valve can be stabilized to a new aperture, and Fig. 5 is the closed-loop control block diagram that gas flow is regulated.The both air flow modulation principle of the present embodiment is identical with Fig. 2.
Thermal technology's Mathematical Modeling that the present embodiment is introduced in ignition furnace fire box temperature control method, can provide for the adjusting range of gas flow controlling opening of valve and instruct quickly and accurately foundation, after adopting the method for the present embodiment, while carrying out firing temperature adjusting by a relatively large margin under production status, regulating cycle can be more original means shorten near half, the valve event number of times reduce near half, not only accelerated governing speed, and effectively extended the life-span of valve actuator;
The present embodiment has solved the mutual restriction problem of three requirements " steady, accurate, fast " of temperature control method well, that is:
(1) the valve event frequency reduces, and makes control system more stable.
(2) directly calculate required coal gas amount according to calorific value of gas, burner hearth actual temperature situation in conjunction with thermal technology's Mathematical Modeling, make accuracy higher.
(3) directly by the thermal technology, calculating required coal gas amount, to compare conventional temperature PID control model required time shorter, makes control system reach new steady-state response speed from a kind of stable state faster.
(4) traditional PID thermoregulator is changed into to the pattern of similar self-adaptive regulator, make system architecture simpler, but more applicable.
(5) when the gas flow adjusting reaches requiring of " steady, accurate, fast ", air is because only increased a proportional component with coal gas, so both air flow modulation also can meet the actual production requirement better.
Surely: for closed-loop system, when parameter matching not at that time, can cause vibration.
Accurate: the deviation after adjustment process finishes between output quantity and specified rate is the smaller the better.
Hurry up: when between system output quantity and input quantity, producing deviation, eliminate the quick degree of this deviation.
Because steady standard is mutually to restrict soon, therefore the controlled device difference, various temperature control methods are given priority to soon to steady standard.Rapidity is good, may cause vibration, or overshoot, the control accuracy variation.
The invention also discloses a kind of Ternary Point stove fire box temperature adjusting device, with reference to Fig. 6, described device comprises:
Parameter acquisition module, for the current state parameter and the parameter preset that obtain the Ternary Point stove, described parameter preset comprises: the goal-selling temperature of Ternary Point stove burner hearth;
The target flow computing module, for according to described current state parameter and parameter preset, by thermal technology's calculated with mathematical model, passing into the coal gas target flow in described Ternary Point stove burner hearth, the goal-selling temperature that described thermal technology's Mathematical Modeling is described Ternary Point stove burner hearth and the corresponding relation that need to pass into the coal gas target flow in described Ternary Point stove burner hearth;
Closed loop control module, carry out the flow closed-loop control for the coal gas target flow according to calculating to the gas regulator on described Ternary Point stove, to realize the adjusting to described Ternary Point stove fire box temperature.
Above embodiment is only for illustrating the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (10)
1. a Ternary Point stove fire box temperature control method, is characterized in that, said method comprising the steps of:
S1: obtain current state parameter and the parameter preset of Ternary Point stove, described parameter preset comprises: the goal-selling temperature of Ternary Point stove burner hearth;
S2: need to pass into the coal gas target flow in described Ternary Point stove burner hearth according to described current state parameter and parameter preset by thermal technology's calculated with mathematical model, the goal-selling temperature that described thermal technology's Mathematical Modeling is described Ternary Point stove burner hearth and the corresponding relation that need to pass into the coal gas target flow in described Ternary Point stove burner hearth;
S3: according to the coal gas target flow calculated, the gas regulator on described Ternary Point stove is carried out to the flow closed-loop control, to realize the adjusting to described Ternary Point stove fire box temperature.
2. the method for claim 1, is characterized in that, further comprising the steps of between step S1 and S2:
The current state parameter obtained is carried out to pretreatment.
3. method as claimed in claim 2, is characterized in that, described pretreatment comprises: at least one in Filtering and smoothing.
4. the method for claim 1, is characterized in that, described state parameter comprises: the environment temperature T at the thickness of feed layer H in burner hearth, place, burner hearth place
ring, the first gas temperature T
coal 1, required the first air of completing combustion the first coal gas temperature T
empty 1, the second gas temperature T
coal 2temperature T with required the second air of completing combustion the second coal gas
empty 2, described parameter preset also comprises: ignition furnace burner hearth area S
stove, sintering pallet bottom to the height of furnace roof is H
0, flue gas average specific heat at constant pressure C in burner hearth
cigarette, ignition furnace calorific intensity coefficient ε, the first coal gas low heat value q
coal 1, the second coal gas low heat value q
coal 2, the fiducial temperature T of mark during state
0, the first air and the first coal gas proportionality coefficient k
1; The proportionality coefficient k of the second air and the second coal gas
2, the first coal gas average specific heat at constant pressure C
coal 1, the second coal gas average specific heat at constant pressure C
coal 2, the first air average specific heat at constant pressure C
empty 1average specific heat at constant pressure C with the second air
empty 2.
5. method as claimed in claim 4, is characterized in that, described thermal technology's Mathematical Modeling is:
Wherein, F
coal 1it is the first coal gas target flow value; F
coal 2it is the second coal gas target flow value; T
stovegoal-selling temperature for Ternary Point stove burner hearth.
6. method as claimed in claim 5, is characterized in that, described parameter preset also comprises: need fixing coal gas label and the preset flow that needs fixing coal gas;
In step S2, the coal gas target flow that calculating need to pass in described Ternary Point stove burner hearth further comprises:
Judge whether to fix the flow of the first coal gas according to the coal gas label received, if, described the first coal gas target flow is fixed as to described preset flow, and need to passes into the second coal gas target flow F in described Ternary Point stove burner hearth by described thermal technology's calculated with mathematical model
coal 2, otherwise, described the second coal gas target flow is fixed as to described preset flow, and need to passes into the first coal gas target flow F in described Ternary Point stove burner hearth by described thermal technology's calculated with mathematical model
coal 1.
7. method as claimed in claim 6, is characterized in that, described current state parameter also comprises: the Current Temperatures T of described Ternary Point stove burner hearth;
Between step S2 and S3, also comprise:
S201: judge whether to meet the goal-selling temperature T of fire box temperature in stable state and burner hearth
stovebe not less than the first goal-selling temperature threshold with the absolute value of the difference of Current Temperatures T, if, performing step S202, otherwise directly perform step S3, described stable state is for to be less than the second goal-selling temperature threshold in Preset Time internal furnace range of temperature;
S202: judge whether to fix the flow of the first coal gas according to described coal gas label, if by fine setting thermal technology calculated with mathematical model, need to pass into the second coal gas fine setting flow F in described Ternary Point stove burner hearth
coal 2', and execution step S203; Otherwise, by fine setting thermal technology calculated with mathematical model, need to pass into the first coal gas fine setting flow F in described Ternary Point stove burner hearth
coal 1', and execution step S204;
S203: by described the second gas flow F
coal 2with the second coal gas fine setting flow F
coal 2' additive value as the coal gas target flow calculated, and directly perform step S3;
S204: by described the first gas flow F
coal 1with the first coal gas fine setting flow F
coal 1' additive value as the coal gas target flow calculated, and directly perform step S3.
8. method as claimed in claim 7, is characterized in that, calculates described the second coal gas fine setting flow F
coal 2in ' time, fine setting thermal technology Mathematical Modeling is:
Calculate described the first coal gas fine setting flow F
coal 1in ' time, fine setting thermal technology Mathematical Modeling is:
9. method as claimed in claim 7 or 8, is characterized in that, the span of described Preset Time is 1～4 minute, and the span of described the second goal-selling temperature threshold is 0.5～5 ℃.
10. a Ternary Point stove fire box temperature adjusting device, is characterized in that, described device comprises:
Parameter acquisition module, for the current state parameter and the parameter preset that obtain the Ternary Point stove, described parameter preset comprises: the goal-selling temperature of Ternary Point stove burner hearth;
The target flow computing module, for according to described current state parameter and parameter preset, by thermal technology's calculated with mathematical model, passing into the coal gas target flow in described Ternary Point stove burner hearth, the goal-selling temperature that described thermal technology's Mathematical Modeling is described Ternary Point stove burner hearth and the corresponding relation that need to pass into the coal gas target flow in described Ternary Point stove burner hearth;
Closed loop control module, carry out the flow closed-loop control for the coal gas target flow according to calculating to the gas regulator on described Ternary Point stove, to realize the adjusting to described Ternary Point stove fire box temperature.
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| CN111306951A (en) * | 2019-10-24 | 2020-06-19 | 深圳市纳设智能装备有限公司 | Control method of multi-temperature-zone sliding rail tube furnace |
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