CN103499101B - A kind of temperature of hearth of ternary ignition furnace control method and device - Google Patents
A kind of temperature of hearth of ternary ignition furnace control method and device Download PDFInfo
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Abstract
The invention discloses a kind of temperature of hearth of ternary ignition furnace control method and device, relate to sintering ignition technical field, said method comprising the steps of: S1: the current state parameter and the parameter preset that obtain Ternary Point stove, described parameter preset comprises: the pre-set target temperature of Ternary Point stove burner hearth; S2: need to pass into the coal gas target flow in described Ternary Point stove burner hearth by thermal technology's calculated with mathematical model according to described current state parameter and parameter preset; S3: carry out flow closed-loop control to the gas regulator on described Ternary Point stove according to the coal gas target flow calculated, to realize the adjustment to described temperature of hearth of ternary ignition furnace.The present invention calculates ternary stove burner hearth by thermal technology's Mathematical Modeling and reaches the coal gas target flow passed into required for pre-set target temperature, only need directly to carry out closed-loop control to gas flow, shorten the response time that fire box temperature reaches pre-set target temperature, reduce hysteresis quality.
Description
Technical field
The present invention relates to sintering ignition technical field, particularly a kind of temperature of hearth of ternary ignition furnace control method and device.
Background technology
Sintering process is the important step in smelting technique, for by the powdery not easily smelted mixed material or be called compound be sintered to be easy to smelt sintering deposit.Igniting is a very important link in sintering process flow process.Sintering process is from the solid fuel igniting on compound top layer, the raw materials for sintering mixed is evenly distributed to after on chassis, the hot strip flame provided by ignition furnace, raw materials for sintering top layer be heated to above solid-fuelled burning-point and take fire, more sufficient oxygen amount being provided by air exhauster exhausting and being impelled sintering process to be rapidly to down and carry out.
Sintering ignition system requires that ignition furnace meets following three conditions:
(1) enough firing temperatures and ignition intensity is had.
(2) suitable high temperature hold time.
(3) evenly light a fire along chassis length and width.
Can the quality of ignition quality carry out and the intensity of sintering deposit smoothly by directly having influence on sintering process.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, the bed of material cannot be made to reach sintering strength, by a large amount of the returning mine of generation.Otherwise firing temperature too high or duration of ignition is long can cause again sintering feed top layer to superfuse affect air-flow and pass through, and reduce bed permeability, reduction vertical sintering speed, thus cause productivity ratio to reduce, make the FeO content of sintering deposit raise, reducing property degenerates simultaneously.
In addition, according to statistics, the process energy consumption of sintering plant accounts for about 10% of steel and iron industry total energy consumption, and sintering ignition energy consumption accounts for the 7%-8% of sintering plant revamp.Therefore, the consumption of igniter fuel also directly has influence on the height of sintering comprehensive energy consumption.
Ignition furnace is different according to the kind 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, binary ignition furnace and Ternary Point stove can be divided into.
Patent publication No. is: 101984322A, and patent name is: the temperature-controlled process that patent discloses hot blast when a kind of sintering ignition furnace combustion air is normal operating condition from cold wind transition when starting of temperature-controlled process and system and system during a kind of sintering ignition furnace cold-hot wind transition.The method mainly considers after the hysteresis quality of thermocouple temperature measurement signal and combustion air temperature rise, the problem that required coal gas amount reduces.Its control method is detected value by comparison fire box temperature repeatedly and setting value, regulates coal gas amount, and its essence is still conventional closed loop control method, there is the problem that valve event is frequent, system response time is long.Patent publication No. is: 201514580U, patent name is: the control of patent mainly from hardware configuration aspect to ignition furnace of sintering machine of the composite control apparatus of ignition furnace of sintering machine is set forth, propose employing industrial computer, programmable logic controller (PLC) PLC, temperature thermocouple, and pressure sensor, flow sensor and the flow control valve be arranged on space gas pipeline regulates 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 is by judging valve opening and the difference size of feedback valve opening, selecting to adopt Fuzzy control strategy or PID control strategy.In fact be also the control realizing firing temperature by the ratio of adjust fuel amount and air mass flow, also can there is the problem that valve event is frequent, system responses is delayed.
For Ternary Point stove, the Ternary Point stove of prior art is when production run, and ignition furnace fire box temperature controls to be substantially all adopt temperature cascade control mode automatically, and being namely target configuration temperature scaling factor mode with fire box temperature, is master selector; Respectively with two kinds of gas flows for target configuration flow close-loop control mode, be two secondary controllers, as the output of two secondary controllers after the output of master selector distributes, be typical temperature of hearth of ternary ignition furnace serials control theory diagram as shown in Figure 1.(output of so-called serials control and previous master selector is as the input of follow-up secondary controller).
The effect of distributor two kinds of gas flows can be pro rata distributed, or fixing wherein one regulates another, specifically manually can be determined according to combustion case by operating personnel.
Temperature controls to be all generally delayed comparatively large and be nonlinear control, and flow-control reacts very fast usually.Therefore, in ignition furnace temperature controls, 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 control in conjunction with the control mode of PID.
Adjustment when inner ring adjuster 21, adjuster 22 are changes in flow rate in Fig. 1, belongs to accurate adjustment, adjustment when outer shroud adjuster 1 is variations in temperature, belongs to coarse adjustment.This control model with fire box temperature T_sv for target, the actual temperature TI that thermocouple detects is as negative feedback links, both compare and obtain deviation delta E1, deviation delta E1 adjuster 1 in control system exports, as two kinds of coal gas target flows after distributor, the actual gas flow that the target flow of two kinds of coal gas detects with corresponding flowmeter respectively compares and obtains corresponding deviation delta E21, Δ E22, deviation exports the opening control signal as gas regulator respectively through adjuster in control system 21,22, thus difference control combustion gas flow size.
In production process when gas pressure fluctuation or other factors cause gas flow to fluctuate, corresponding flow regulator can perform in time to adjust to export and again change gas flow control valve opening, ensures the stable of target flow; When Flow-rate adjustment reaction is not prompt enough and temporarily unbalance or when causing variations in temperature because of other external factor as sintering machine velocity variations, bed permeability change etc., the thermoregulator 1 of outer shroud can perform adjustment output in time and again change coal gas target flow, control system adjusts repeatedly, and what meeting was fast as far as possible reaches new stable state.For gas flow adjuster 21, 22, adopt traditional PI to regulate and namely can well realize regulatory function, but it is relatively slow and specific discharge regulates complicated process that temperature regulates, therefore no matter adjuster 1 adopts PID adjuster or fuzzy self-adaption adjuster or other control algolithm, adjuster 1 all needs by repeatedly comparison fire box temperature measured value and setting value, the aperture of continuous change gas flow control valve, make burner hearth actual temperature constantly close to target set 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 needs according to the proportional adjustment of gas flow, concrete ratio is determined by coal gas and air reaction, control principle drawing as shown in Figure 2, air mass flow closed-loop adjustment and gas flow closed-loop adjustment just the same, just increase proportional component, i.e. multiplier.When coal gas target flow F_sv21 or F_sv22 stablizes, 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 the output of flow regulator controls corresponding flow control valve respectively, thus changes gas flow, reaches temperature controlled object.
In sum, current ignition furnace temperature control method all needs by repeatedly comparison fire box temperature measured value and setting value, by means such as PID control valve or fuzzy controls, the aperture of continuous change gas flow control valve, make burner hearth actual temperature constantly close to target set temperature, but all can cause control valve frequent movement, the response time that fire box temperature reaches design temperature is oversize, hysteresis quality is too large, therefore be the stability of retentive control in actual use, substantially be all adopt flow control mode, namely the target flow of flow control valve is directly set, artificial frequent adjustment coal gas target flow is needed when producing unstable, thus increase the labour intensity of operating personnel, even can affect the seed output and 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 setting target temperature, to shorten lag time.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of temperature of hearth of ternary ignition furnace control method, said method comprising the steps of:
S1: the current state parameter and the parameter preset that obtain Ternary Point stove, described parameter preset comprises: the pre-set target temperature of Ternary Point stove burner hearth;
S2: need to pass into the coal gas target flow in described Ternary Point stove burner hearth by thermal technology's calculated with mathematical model according to described current state parameter and parameter preset, described thermal technology's Mathematical Modeling is the pre-set target temperature of described Ternary Point stove burner hearth and the corresponding relation needing the coal gas target flow passed in described Ternary Point stove burner hearth;
S3: carry out flow closed-loop control to the gas regulator on described Ternary Point stove according to the coal gas target flow calculated, to realize the adjustment to described temperature of hearth of ternary ignition furnace.
Wherein, further comprising the steps of between step S1 and S2:
Pretreatment is carried out to the current state parameter obtained.
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, burner hearth place place
ring, the first gas temperature T
coal 1, to burn the temperature T of the first air needed for the first coal gas completely
empty 1, the second gas temperature T
coal 2burn the temperature T of the second air needed for the second coal gas completely
empty 2, described parameter preset also comprises: ignition furnace burner hearth area S
stove, sintering pallet bottom is H to the height of furnace roof
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, mark state time fiducial temperature T
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 1with the average specific heat at constant pressure C of 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
stovefor the pre-set target temperature of Ternary Point stove burner hearth.
Wherein, described parameter preset also comprises: the coal gas label that need fix and the preset flow of coal gas that need fix;
In step S2, calculate and need the coal gas target flow passed in described Ternary Point stove burner hearth to comprise further:
Coal gas label according to receiving judges whether the flow fixing the first coal gas, if, then described first coal gas target flow is fixed as described preset flow, and is needed the second coal gas target flow F of passing in described Ternary Point stove burner hearth by described thermal technology's calculated with mathematical model
coal 2, otherwise, described second coal gas target flow is fixed as described preset flow, and is needed the first coal gas target flow F of passing 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;
Also comprise between step S2 and S3:
S201: judge whether that meeting fire box temperature is in stable state and the pre-set target temperature T of burner hearth
stovebe not less than the first pre-set target temperature threshold value with the absolute value of the difference of Current Temperatures T, if so, then perform step S202, otherwise directly perform step S3, described stable state is for be less than the second pre-set target temperature threshold value in Preset Time internal furnace range of temperature;
S202: judge whether the flow fixing the first coal gas according to described coal gas label, if so, then needs the second coal gas passed in described Ternary Point stove burner hearth to finely tune flow F by fine setting thermal technology calculated with mathematical model
coal 2', and perform step S203; Otherwise, the first coal gas fine setting flow F passed in described Ternary Point stove burner hearth is needed by fine setting thermal technology calculated with mathematical model
coal 1', and perform step S204;
S203: by described 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 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, described second coal gas fine setting flow F is calculated
coal 2in ' time, fine setting thermal technology Mathematical Modeling is:
Calculate described 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 second pre-set target temperature threshold value is 0.5 ~ 5 DEG C.
The invention also discloses a kind of temperature of hearth of ternary ignition furnace adjusting device, described device comprises:
Parameter acquisition module, for obtaining current state parameter and the parameter preset of Ternary Point stove, described parameter preset comprises: the pre-set target temperature of Ternary Point stove burner hearth;
Target flow computing module, for needing to pass into the coal gas target flow in described Ternary Point stove burner hearth by thermal technology's calculated with mathematical model according to described current state parameter and parameter preset, described thermal technology's Mathematical Modeling is the pre-set target temperature of described Ternary Point stove burner hearth and the corresponding relation needing the coal gas target flow passed in described Ternary Point stove burner hearth;
Closed loop control module, for carrying out flow closed-loop control to the gas regulator on described Ternary Point stove, to realize the adjustment to described temperature of hearth of ternary ignition furnace according to the coal gas target flow calculated.
(3) beneficial effect
The present invention calculates ternary stove burner hearth by thermal technology's Mathematical Modeling and reaches the coal gas target flow passed into required for pre-set target temperature, only need directly to carry out closed-loop control to gas flow, shorten the response time that fire box temperature reaches pre-set target temperature, reduce hysteresis quality.
Accompanying drawing explanation
Fig. 1 is the temperature of hearth of ternary ignition furnace control principle block diagram of prior art;
Fig. 2 is prior art air flow amount Automatic Control Theory block diagram;
Fig. 3 is the flow chart of the temperature of hearth of ternary ignition furnace control method of one embodiment of the present invention;
Fig. 4 is the flow chart of the temperature of hearth of ternary ignition furnace 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 temperature of hearth of ternary ignition furnace adjusting device of one embodiment of the present invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
Fig. 3 is the flow chart of the temperature of hearth of ternary ignition furnace control method of one embodiment of the present invention; With reference to Fig. 1, said method comprising the steps of:
S1: the current state parameter and the parameter preset that obtain Ternary Point stove, described parameter preset comprises: the pre-set target temperature of Ternary Point stove burner hearth;
S2: need to pass into the coal gas target flow in described Ternary Point stove burner hearth by thermal technology's calculated with mathematical model according to described current state parameter and parameter preset, described thermal technology's Mathematical Modeling is the pre-set target temperature of described Ternary Point stove burner hearth and the corresponding relation needing the coal gas target flow passed in described Ternary Point stove burner hearth;
S3: carry out flow closed-loop control to the gas regulator on described Ternary Point stove according to the coal gas target flow calculated, to realize the adjustment to described temperature of hearth of ternary ignition furnace.
Present embodiment calculates ternary stove burner hearth by thermal technology's Mathematical Modeling and reaches the coal gas target flow passed into required for pre-set target temperature, only need directly to carry out closed-loop control to gas flow, shorten the response time that fire box temperature reaches setting target temperature, reduce hysteresis quality; After calculating the coal gas target flow needing to pass into, direct control gas regulator aperture, is made by which in targeted gas flow a period of time of calculating stable, is unlikely frequent fluctuation, thus cause the target specified rate fluctuation of gas flow closed-loop control frequent, cause system oscillation.
For reducing the data fluctuations of state parameter and the impact of abnormal data, preferably, further comprising the steps of between step S1 and S2: pretreatment is carried out to the current state parameter obtained.
For ensureing pretreated effect, preferably, described pretreatment comprises: at least one in Filtering and smoothing.
For ensureing 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, burner hearth place place
ring, the first gas temperature T
coal 1, to burn the temperature T of the first air needed for the first coal gas completely
empty 1, the second gas temperature T
coal 2burn the temperature T of the second air needed for the second coal gas completely
empty 2, described parameter preset also comprises: ignition furnace burner hearth area S
stove, sintering pallet bottom is H to the height of furnace roof
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, mark state time fiducial temperature T
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 1with the average specific heat at constant pressure C of 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
stovefor the pre-set target temperature of Ternary Point stove burner hearth.
Above-mentioned thermal technology's mathematical derivation process is: first, according to the design experiences of ignition furnace, needs the heat fed can represent with following formula in the ignition furnace 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 small change along with the change of the bed depth on sintering pallet; V
stove=S
stove* (H
0-H), wherein S
stovefor constant, represent ignition furnace burner hearth area, unit is m
2; H
0for definite value, represent the height of sintering pallet bottom to furnace roof, unit is m, H is bed depth on chassis, and unit is m, obtains by sintering machine head material-level detecting device; T
stovefor the pre-set target temperature that burner hearth will control, unit is DEG C, is set as required by operating personnel; T
ringfor burner hearth place place environment temperature, unit is DEG C, knows by detection means; C
cigarettefor constant, represent flue gas average specific heat at constant pressure in burner hearth, unit is kJ/ (m
3dEG C); ε is calorific intensity coefficient, and to a certain set ignition furnace, this parameter is also a constant; Q
supplyfor the temperature in unit time internal furnace reaches the heat of pre-set target temperature needs infeed, the heat etc. that on this heat and chassis, material heats up, surrounding is dispelled the heat, main exhauster exhausting flue gas is taken away is paid heat and is formed thermal balance, the heat of unit interval internal consumption is basic equal with the heat that fuel gas buring brings, and therefore heat supply needs to carry out continuously.
Secondly, if Q
supply=Q
empty+ Q
coal+ Q
change, Q
supplyfor feeding the heat in ignition furnace burner hearth in the unit time, 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
coalwith the chemical reaction heat Q that coal gas is brought into
change.Ternary Point stove is except air dielectric, and general ignition furnace fuel can be made up of the first coal gas and the second coal gas, therefore Q
supply=Q
for 1+ Q
for 2, be the datum mark that heat calculates with standard state (101325Pa, 273.15K), following calculating formula can be obtained:
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 air burnt completely needed for 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), technical manual can be looked into know; F
empty 1and F
coal 1be respectively the actual flow of the first air and the first coal gas, m
3/ h, also can as 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 air gas proportionality coefficient, is determined by fuel characteristic; 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, is known by detection means; T
0for constant, represent fiducial temperature during mark state, namely 0 DEG C.Q
coal 1be the low heat value of the first coal gas, kJ/m
3, known by detection means.
Due in ignition furnace actual motion, generally can ensure that air capacity is slightly excessive, therefore to press gas meter proper for chemical reaction heat, and through type (2), (3) and (4) then 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, then can obtain thermal technology's Mathematical Modeling is:
Because the flow adjusting two kinds of coal gas can make system occur unstability simultaneously, so in present embodiment, adopt fixing a kind of coal gas, adjust the mode of another kind of coal gas, the unstability of system can be reduced like this, the regulating time reaching target temperature can be shorter, and the action frequency of valve can be reduced, in addition, abundant or cheap owing to generally having a kind of in two kinds of coal gas, for cost-saving, preferably, described parameter preset also comprises: receive the preset flow of coal gas needing the coal gas label of firm discharge (for distinguishing the first coal gas and the second coal gas) and need fix,
In step S2, calculate and need the coal gas target flow passed in described Ternary Point stove burner hearth to comprise further:
Coal gas label according to receiving judges whether the flow fixing the first coal gas, if, then described first coal gas target flow is fixed as described preset flow (by described preset flow as described first coal gas target flow), and needs to pass 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 second coal gas target flow is fixed as described preset flow (by described preset flow as described second coal gas target flow), and needs to pass 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, calculate and need to pass into the first gas flow F in described Ternary Point stove burner hearth
coal 1time, by calculating with following formula (8),
Fix the target flow of the first coal gas, calculate and need to pass into the second gas flow F in described Ternary Point stove burner hearth
coal 2time, by calculating with following formula (9),
For specified point stove, except Ternary Point stove pre-set target temperature T in formula (8), (9)
stovebe outside real-time change with chassis material loading layer thickness H, T
coal, T
empty, T
ringalthough be real-time data collection but change less within a certain period of time, other all belongs to constant, can simply think that these data are constant, then formula (8) (9) are a curvilinear function.
From formula (8), fix the second coal gas target flow F
coal 2, the first coal gas target flow value F
coal 1with temperature of hearth of ternary ignition furnace 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 pre-set target temperature T
stovebecome once linear relationship.
Due in ignition furnace actual moving process, because outside factors, as the impact of the gas permeability, main exhauster exhausting air quantity, machine speed etc. of compound on chassis in Ternary Point stove, the absolute value of the difference of pre-set target temperature and actual furnace temperature can be caused to be in and to allow outside departure scope, preferably, described current state parameter also comprises: the Current Temperatures T of described Ternary Point stove burner hearth;
Also comprise between step S2 and S3:
S201: judge whether that meeting fire box temperature is in stable state and the pre-set target temperature T of burner hearth
stovebe not less than the first pre-set target temperature threshold value with the absolute value of the difference of Current Temperatures T, if so, then perform step S202, otherwise directly perform step S3, described stable state is for be less than the second pre-set target temperature threshold value in Preset Time internal furnace range of temperature;
S202: judge whether the flow fixing the first coal gas according to described coal gas label, if so, then needs the second coal gas passed in described Ternary Point stove burner hearth to finely tune flow F by fine setting thermal technology calculated with mathematical model
coal 2', and perform step S203; Otherwise, the first coal gas fine setting flow F passed in described Ternary Point stove burner hearth is needed by fine setting thermal technology calculated with mathematical model
coal 1', and perform step S204;
S203: by described 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 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, described first coal gas fine setting flow F is calculated
coal 1in ' time, fine setting thermal technology Mathematical Modeling is pressed following formula (10) and is calculated:
Calculate described 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, if value is 2 minutes; The span of described second pre-set target temperature threshold value is 0.5 ~ 5 DEG C, and if value is 1 DEG C, value is less, shows the requirement of control accuracy higher.
Embodiment
With a specific embodiment, the present invention is described below, 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 computation starts.
Step 102: read relevant parameter preset, described parameter preset comprises: pre-set target 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, the coal gas label that need fix (is F when fixing the first coal gas with the preset flow of the coal gas that need fix
coal 1, be F when fixing the second coal gas
coal 2).Wherein, T
stove, k
1, k
2and F
coal 1(or F
coal 2) set as required by operating personnel, what be different from other constant is that these parameters may have adjustment according to different operating modes, therefore all can as constant.
Step 103: read current state parameter value, described state parameter comprises: the thickness of feed layer H in burner hearth, fire box temperature T, air themperature T
empty 1, T
empty 2, gas temperature T
coal 1, T
coal 2, environment temperature T
ring.
Step 104: pretreatment is carried out to current state parameter.For the variable detected in real time, for reducing the impact of fluctuation and abnormal data, filtering, smoothing processing operation need be done to data.
Step 105: judge whether the flow selecting to fix the first coal gas according to described coal gas label.
Step 106: if the determination result is YES, then using described preset flow as described first coal gas target flow, and calculate according to formula (9) and need the second gas flow F of passing into
coal 2, and perform step 108.
Step 107: if judged result is no, then using described preset flow as described second coal gas target flow, and calculate according to formula (8) and need the first gas flow F of passing into
coal 1, and perform step 108.
Step 108: judge whether that fine setting calculated with mathematical model fine setting gas flow enabled by needs.Determination methods is: fire box temperature T has stablized and the pre-set target temperature T of burner hearth
stovethe first pre-set target temperature threshold value is not less than with the absolute value of the difference of Current Temperatures T; If NO, then perform step 109, then perform step 112 if yes.
Step 109: judge whether the flow selecting to fix the first coal gas according to described coal gas label, performs step 110 if yes, otherwise performs step 111.
Step 110: export F
coal 2target as the adjuster of the second coal gas inputs, and carries out the flow closed-loop adjustment of the second coal gas, EP (end of program) after completing.
Step 111: export F
coal 1target as the adjuster of the first coal gas inputs, and carries out the flow closed-loop adjustment of the first coal gas, EP (end of program) after completing.
Step 112: judge whether the flow selecting to fix the first coal gas according to described coal gas label, performs step 113 if yes, otherwise performs step 115.
Step 113: calculate F according to formula (11)
coal 2'.
Step 114: export F
coal 2+ F
coal 2' input as the target 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: calculate F according to formula (10)
coal 1'.
Step 116: export F
coal 1+ F
coal 1' input as the target 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, namely gas flow closed-loop control is completed, this closed-loop control generally can enter new stable state by last stable state in actual motion within the short time in a few second, thus reaches the rapidity of response.Now gas flow control valve can be stabilized to a new aperture, and Fig. 5 is the closed-loop control block diagram that gas flow regulates.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, foundation can be instructed quickly and accurately for the adjusting range of gas flow controlling opening of valve provides, after adopting the method for the present embodiment, when carrying out firing temperature adjustment by a relatively large margin under production status, regulating cycle more original means can shorten nearly half, valve event number of times reduces nearly half, not only accelerates governing speed, and effectively extends the life-span of valve actuator;
The present embodiment solves the mutual restriction problem of three requirements " steady, accurate, fast " of temperature control method well, that is:
(1) 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 compare conventional temperature PID control model required time by coal gas amount needed for thermodynamic metering shorter, make control system reach new steady-state response speed from a kind of stable state faster.
(4) traditional PID thermoregulator is changed into the pattern of similar self-adaptive regulator, make system architecture simpler, but more applicable.
(5), when reaching the requirement of " steady, accurate, fast " when gas flow regulates, air is because merely add a proportional component with coal gas, and therefore both air flow modulation also can meet actual production requirement better.
Steady: for closed-loop system, when parameter matching not at that time, can vibration be caused.
Accurate: the deviation that adjustment process terminates between rear output quantity and specified rate is the smaller the better.
Hurry up: when producing deviation between system output quantity and input quantity, eliminate the quick degree of this deviation.
Because steady standard is restriction mutually soon, therefore controlled device is different, and various temperature control method is given priority to soon to steady standard.Rapidity is good, may cause vibration, or overshoot, and control accuracy is deteriorated.
The invention also discloses a kind of temperature of hearth of ternary ignition furnace adjusting device, with reference to Fig. 6, described device comprises:
Parameter acquisition module, for obtaining current state parameter and the parameter preset of Ternary Point stove, described parameter preset comprises: the pre-set target temperature of Ternary Point stove burner hearth;
Target flow computing module, for needing to pass into the coal gas target flow in described Ternary Point stove burner hearth by thermal technology's calculated with mathematical model according to described current state parameter and parameter preset, described thermal technology's Mathematical Modeling is the pre-set target temperature of described Ternary Point stove burner hearth and the corresponding relation needing the coal gas target flow passed in described Ternary Point stove burner hearth;
Closed loop control module, for carrying out flow closed-loop control to the gas regulator on described Ternary Point stove, to realize the adjustment to described temperature of hearth of ternary ignition furnace according to the coal gas target flow calculated.
Above embodiment is only for illustration of the present invention; and be not limitation of the present invention; the those of ordinary skill of relevant technical field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all equivalent technical schemes also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (8)
1. a temperature of hearth of ternary ignition furnace control method, is characterized in that, said method comprising the steps of:
S1: the current state parameter and the parameter preset that obtain Ternary Point stove, described parameter preset comprises: the pre-set target temperature of Ternary Point stove burner hearth;
S2: need to pass into the coal gas target flow in described Ternary Point stove burner hearth by thermal technology's calculated with mathematical model according to described current state parameter and parameter preset, described thermal technology's Mathematical Modeling is the pre-set target temperature of described Ternary Point stove burner hearth and the corresponding relation needing the coal gas target flow passed in described Ternary Point stove burner hearth;
S3: carry out flow closed-loop control to the gas regulator on described Ternary Point stove according to the coal gas target flow calculated, to realize the adjustment to described temperature of hearth of ternary ignition furnace;
Wherein, described state parameter comprises: the environment temperature T at the thickness of feed layer H in burner hearth, burner hearth place place
ring, the first gas temperature T
coal 1, to burn the temperature T of the first air needed for the first coal gas completely
empty 1, the second gas temperature T
coal 2burn the temperature T of the second air needed for the second coal gas completely
empty 2, described parameter preset also comprises: ignition furnace burner hearth area S
stove, sintering pallet bottom is H to the height of furnace roof
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, mark state time fiducial temperature T
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 1with the average specific heat at constant pressure C of the second air
empty 2;
Wherein, described thermal technology's Mathematical Modeling is:
S
stove* (H
0-H) × C
cigarette× ε × (T
stove-T
ring)=F
coal 1× [C
empty 1× k
1× (T
empty 1-T
0)+C
coal 1× (T
coal 1-T
0)+q
coal 1]+F
coal 2× [C
empty 2× k
2× (T
empty 2-T
0)+C
coal 2× (T
coal 2-T
0)+q
coal 2]
Wherein, F
coal 1it is the first coal gas target flow value; F
coal 2it is the second coal gas target flow value; T
stovefor the pre-set target temperature of Ternary Point stove burner hearth.
2. the method for claim 1, is characterized in that, further comprising the steps of between step S1 and S2:
Pretreatment is carried out to the current state parameter obtained.
3. method as claimed in claim 2, it 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 parameter preset also comprises: the coal gas label that need fix and the preset flow of coal gas that need fix;
In step S2, calculate and need the coal gas target flow passed in described Ternary Point stove burner hearth to comprise further:
Coal gas label according to receiving judges whether the flow fixing the first coal gas, if, then described first coal gas target flow is fixed as described preset flow, and is needed the second coal gas target flow F of passing in described Ternary Point stove burner hearth by described thermal technology's calculated with mathematical model
coal 2, otherwise, described second coal gas target flow is fixed as described preset flow, and is needed the first coal gas target flow F of passing in described Ternary Point stove burner hearth by described thermal technology's calculated with mathematical model
coal 1.
5. method as claimed in claim 4, it is characterized in that, described current state parameter also comprises: the Current Temperatures T of described Ternary Point stove burner hearth;
Also comprise between step S2 and S3:
S201: judge whether that meeting fire box temperature is in stable state and the pre-set target temperature T of burner hearth
stovebe not less than the first pre-set target temperature threshold value with the absolute value of the difference of Current Temperatures T, if so, then perform step S202, otherwise directly perform step S3, described stable state is for be less than the second pre-set target temperature threshold value in Preset Time internal furnace range of temperature;
S202: judge whether the flow fixing the first coal gas according to described coal gas label, if so, then needs the second coal gas passed in described Ternary Point stove burner hearth to finely tune flow F by fine setting thermal technology calculated with mathematical model
coal 2', and perform step S203; Otherwise, the first coal gas fine setting flow F passed in described Ternary Point stove burner hearth is needed by fine setting thermal technology calculated with mathematical model
coal 1', and perform step S204;
S203: by described 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 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.
6. method as claimed in claim 5, is characterized in that, calculates described second coal gas fine setting flow F
coal 2in ' time, fine setting thermal technology Mathematical Modeling is:
Calculate described first coal gas fine setting flow F
coal 1in ' time, fine setting thermal technology Mathematical Modeling is:
7. the method as described in claim 5 or 6, is characterized in that, the span of described Preset Time is 1 ~ 4 minute, and the span of described second pre-set target temperature threshold value is 0.5 ~ 5 DEG C.
8. a temperature of hearth of ternary ignition furnace adjusting device, is characterized in that, described device comprises:
Parameter acquisition module, for obtaining current state parameter and the parameter preset of Ternary Point stove, described parameter preset comprises: the pre-set target temperature of Ternary Point stove burner hearth;
Target flow computing module, for needing to pass into the coal gas target flow in described Ternary Point stove burner hearth by thermal technology's calculated with mathematical model according to described current state parameter and parameter preset, described thermal technology's Mathematical Modeling is the pre-set target temperature of described Ternary Point stove burner hearth and the corresponding relation needing the coal gas target flow passed in described Ternary Point stove burner hearth;
Closed loop control module, for carrying out flow closed-loop control to the gas regulator on described Ternary Point stove, to realize the adjustment to described temperature of hearth of ternary ignition furnace according to the coal gas target flow calculated;
Wherein, described state parameter comprises: the environment temperature T at the thickness of feed layer H in burner hearth, burner hearth place place
ring, the first gas temperature T
coal 1, to burn the temperature T of the first air needed for the first coal gas completely
empty 1, the second gas temperature T
coal 2burn the temperature T of the second air needed for the second coal gas completely
empty 2, described parameter preset also comprises: ignition furnace burner hearth area S
stove, sintering pallet bottom is H to the height of furnace roof
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, mark state time fiducial temperature T
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 1with the average specific heat at constant pressure C of the second air
empty 2;
Wherein, described thermal technology's Mathematical Modeling is:
S
stove* (H
0-H) × C
cigarette× ε × (T
stove-T
ring)=F
coal 1× [C
empty 1× k
1× (T
empty 1-T
0)+C
coal 1× (T
coal 1-T
0)+q
coal 1]+F
coal 2× [C
empty 2× k
2× (T
empty 2-T
0)+C
coal 2× (T
coal 2-T
0)+q
coal 2]
Wherein, F
coal 1it is the first coal gas target flow value; F
coal 2it is the second coal gas target flow value; T
stovefor the pre-set target temperature of Ternary Point stove burner hearth.
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| CN105278412B (en) * | 2015-10-30 | 2019-05-17 | 青岛海尔科技有限公司 | Control method, device and the gas-cooker of a kind of pair of stepless fire tuning of gas-cooker |
| CN106595311A (en) * | 2016-12-30 | 2017-04-26 | 山东和隆优化能源科技有限公司 | Combustion optimization control system for sintering machine ignition furnace |
| CN109631607B (en) * | 2018-11-30 | 2020-05-01 | 中国地质大学（武汉） | Intelligent sintering ignition temperature control method considering gas pressure fluctuation |
| CN111306951B (en) * | 2019-10-24 | 2021-07-09 | 深圳市纳设智能装备有限公司 | Control method of multi-temperature-zone sliding rail tube furnace |
| CN113359900B (en) * | 2021-06-30 | 2022-04-05 | 沈阳鑫博工业技术股份有限公司 | Fuzzy automatic temperature control method for alumina roasting furnace |
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