CN114317860A - Combustion control method of heat accumulating type hot blast stove - Google Patents
Combustion control method of heat accumulating type hot blast stove Download PDFInfo
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000000446 fuel Substances 0.000 claims description 23
- 230000001276 controlling effect Effects 0.000 claims description 18
- 230000001172 regenerating effect Effects 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 62
- 230000008569 process Effects 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003034 coal gas Substances 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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Abstract
The application discloses a combustion control method of a heat accumulating type hot blast stove, which comprises the steps of obtaining the air supply temperature of the hot blast stove for supplying air to a blast furnace, and obtaining the expected vault temperature T of the burning end state of the hot blast stove according to the air supply temperatureE(ii) a Setting the expected burning time te(ii) a Detect real-time vault temperature T of hot-blast furnace under state of burning outaAnd the furnace burning time t of the current furnace burningaAccording to Δ Ta＝Ta+n+1‑Ta+nCalculating the temperature difference of the vault unit according to a plurality of delta TaAverage unit vault temperature difference
Ta+nRepresents the burning time taDome temperature at the last n unit durations, n being a positive integer; according to
Calculating the budget vault temperature TaAccording to said budget vault temperature Ta' and the expected vault temperature TEThe deviation of the air flow rate of the hot blast stove is adjusted. The combustion control method of the heat accumulating type hot blast stove can realize automatic adjustment of the gas flow and the combustion air flow of the hot blast stove, and avoids over-temperature of the vault, so that the safe operation of the hot blast stove and the stable air supply temperature are ensured.
Description
Technical Field
The application relates to the field of metal smelting, in particular to a combustion control method of a heat accumulating type hot blast stove.
Background
In the blast furnace iron-making production process, a large amount of combustion air needs to be blown into the interior of the blast furnace to promote the iron-making reaction in the blast furnace. Since the blast furnace has a high internal temperature, blowing air at normal temperature causes a rapid drop in the internal temperature of the blast furnace, which is not favorable for the proceeding of the iron-making reaction, and thus, high-temperature air needs to be blown.
Blast furnace hot blast stove, generally adopt blast furnace gas and coke oven gas as fuel, can be divided into two kinds of heat accumulation type and heat exchange type according to the operating principle, wherein, the heat accumulation type hot blast stove, the inside adopts the heat-resisting checker brick mostly, after igniting the blast furnace gas and heating the checker brick to certain temperature, reuse the fresh cold air to carry on the back flushing, the cold air turns into the hot air of high temperature and sends into the blast furnace; when the heat storage temperature is reduced and cannot meet the requirement, cold air is switched to other hot blast stoves, and generally, at least 3 same hot blast stoves are needed to be sequentially switched for recycling. Compared with a heat exchange type hot blast stove, the heat accumulation type hot blast stove has the advantages of high heat exchange temperature and high heat utilization rate; the disadvantage is large volume, but the temperature of the hot air is unstable.
The heat accumulating type blast furnace hot blast stove is one of main supporting equipment for blast furnace iron making, and each blast furnace is generally provided with 3-4 hot blast stoves, and the hot blast stoves are used for heating blast air to a required temperature and continuously providing high-temperature hot blast above 1000 ℃ for the blast furnace so as to burn coke to reduce iron ore into molten iron. The key technology of blast furnace intensified smelting is to raise the hot blast temperature of the hot blast stove. According to the working process of the heat accumulating type hot blast stove, the method is generally divided into three processes of burning, stewing and air supply.
At present, the conventional non-vulnerable quantities such as vault temperature, waste gas temperature, gas flow, air flow, gas pressure, air pressure, gas quality and the like are generally adopted as input quantities at home and abroad for the wind temperature pre-control technology of the heat accumulating type blast furnace hot blast stove, and the combustion is controlled according to the theoretical heat value, exhaust loss and heat exchange efficiency generated by gas combustion so as to control the air supply temperature. However, the method has the following defects that the precision of facilities such as a metering instrument and the like is required to be higher, but the environment conditions such as high temperature, corrosion and the like in the actual production field are severe and have larger fluctuation, the gas supply is insufficient, the gas quality (heat value) is unstable, and the environmental protection discharge is limited, so that the ideal stable automatic furnace burning temperature control technology is difficult to popularize and apply in iron-making enterprises, the vault temperature is easily over-temperature, and the safe operation of the hot blast stove is influenced.
Disclosure of Invention
The application aims to provide a heat accumulating type hot blast stove combustion control method, which can realize automatic adjustment of the gas flow and the combustion air flow of the hot blast stove, avoid overtemperature of a vault, and guarantee safe operation and stable air supply temperature of the hot blast stove.
In order to achieve the above object, the present application provides a combustion control method for a regenerative hot blast stove, comprising:
acquiring the air supply temperature of the hot blast stove to the blast furnace, and acquiring the expected vault temperature T of the burning end state of the hot blast stove according to the air supply temperatureE；
Setting the expected burning time te；
Detect real-time vault temperature T of hot-blast furnace under state of burning outaAnd the furnace burning time t of the current furnace burningaAccording to Δ Ta＝Ta+n+1-Ta+nCalculating the temperature difference of the vault unit and calculating the temperature difference of the vault unit according to a plurality of the delta TaAverage unit vault temperature difference
Ta+nRepresents the burning time taDome temperature at the last n unit durations, n being a positive integer;
according to
Calculating the budget vault temperature TaAccording to said budget vault temperature Ta' and the expected vault temperature TEThe deviation of the air flow rate of the hot blast stove is adjusted.
Optionally, said vault temperature T according to said budgeta' and the expected vault temperature TEThe step of regulating the gas flow and the combustion air flow of the hot blast stove by the deviation comprises the following steps:
according to the expected vault temperature TESetting a deviation range;
if the budget dome temperature Ta' less than the expected vault temperature TEIncreasing the gas flow of the current hot blast stove or reducing the combustion air flow of the current hot blast stove;
if the budget dome temperature Ta' greater than said expected vault temperature TEThe upper limit value of the air flow rate of the hot blast stove is reduced or the combustion air flow rate of the hot blast stove is increased.
Optionally, the said according to
Calculating the budget vault temperature TaThe step of' further comprising:
confirming the first appearance of the Delta T from the start of the furnace burningaInitial furnace burning time t less than or equal to 01And obtaining the initial stage furnace burning time t1Corresponding initial vault temperature T1；
If the current furnace burning time taIn the initial stage of furnace burning time t1If not, stopping calculating the budget vault temperature Ta′；
If the current furnace burning time taExceeds the initial stage furnace burning time t1Then according to
Calculating the budget dome temperature Ta′。
Optionally, further comprising according to Δ T2＝Ta+n+1-Ta+nCalculating the initial furnace burning time t1To the set expected furnace burning time teTwo-stage unit vault temperature difference delta T in time period2；
If the temperature difference delta T of the two-section unit vault2If the upper limit of the allowable temperature difference is larger than the set upper limit, reducing the gas flow of the current hot blast stove or increasing the combustion air flow of the current hot blast stove;
if the temperature difference delta T of the two-section unit vault2If the lower limit of the allowable temperature difference is set, the gas flow of the current hot blast stove is increased or the combustion air flow of the current hot blast stove is reduced.
Optionally, the step of increasing the gas flow rate of the current hot blast stove or decreasing the combustion air flow rate of the current hot blast stove comprises:
when the air opening of the branch pipe reaches 95% or reaches the upper limit of the air-fuel ratio, gradually increasing the gas opening of the branch pipe until the gas opening of the branch pipe reaches 95% or the lower limit of the air-fuel ratio;
when the gas aperture of the branch pipe reaches 95% or the lower limit of the air-fuel ratio, the gas aperture of the main pipe is gradually increased to 95%, and early warning is carried out when the gas aperture of the main pipe reaches 95%.
Optionally, the method further comprises the step of burning the furnace according to the expected burning time teSetting the deviation range of the expected furnace burning time according to
That is to say
Calculating and budgeting furnace burning time tx；
If the estimated furnace burning time txExceeding the expected burning time teIs calculated, the calculated average unit vault temperature difference is cyclically executed
And according to
Calculating the budget vault temperature TaAccording to said budget vault temperature Ta' and the expected vault temperature TERegulating the gas flow and the combustion air flow of the hot blast stove by the deviation of the air flow.
Optionally, the regulating frequency of the branch pipe gas opening and the regulating frequency of the branch pipe air opening are both 1 time/1 min; the adjusting frequency of the gas opening of the main pipe is 1 time/5 min.
Optionally, the adjustment range of the branch pipe gas opening and the adjustment range of the branch pipe air opening are both 1% -3% of the current opening.
Optionally, the real-time vault temperature T of the hot blast stove in the burning state is detectedaAnd the current furnace burning time taBefore the step (2) further comprising: judging the current state of the hot blast stove, if the hot blast stove is in a burning state, continuing to execute the real-time vault of the hot blast stove under the burning stateTemperature TaAnd the current furnace burning time taA step (2);
if the hot blast stove is in a smoldering state or an air supply state, stopping executing the real-time vault temperature T of the hot blast stove in the burning stateaAnd the current furnace burning time taThe step (2).
Optionally, when the hot blast stove is in an air supply state, detecting the current air supply temperature, and if the air supply temperature is lower than the lower limit value of the air supply temperature required by the blast furnace, switching another hot blast stove in a smoldering state to supply air.
Compared with the background technology, the heat accumulating type hot blast stove combustion control method provided by the application obtains the expected vault temperature T of the corresponding hot blast stove in the burning end state according to the air supply temperature of the air supply to the blast furnaceE(ii) a By setting the expected burning time, analyzing the unit vault temperature difference and the average unit vault temperature difference in the current hot blast stove burning process, adjusting and controlling the combustion inlet gas (coal gas and combustion air) of the hot blast stove in real time, controlling the vault temperature, realizing the control of the air supply temperature in the final air supply state by controlling the vault temperature in the burning state, not only avoiding the overtemperature of the vault temperature in the burning process, improving the safety of the hot blast stove operation, but also ensuring the air supply temperature.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a combustion control method of a regenerative hot blast stove according to an embodiment of the present application;
fig. 2 is a flowchart of a combustion control method of a regenerative hot blast stove according to another embodiment of the present application;
fig. 3 is a diagram of the operation state of the hot blast stove.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The embodiment of the application provides a combustion control method for a heat accumulating type hot blast stove, and with reference to fig. 1, the method comprises the following steps:
step S10: acquiring the air supply temperature of the hot blast stove to the blast furnace, and acquiring the expected vault temperature T of the burning end state of the hot blast stove according to the air supply temperatureE；
Step S20: setting the expected burning time te；
Step S30: detect real-time vault temperature T of hot-blast furnace under state of burning outaAnd the furnace burning time t of the current furnace burningaAccording to Δ Ta＝Ta+n+1-Ta+nCalculating the temperature difference of the vault unit and calculating the temperature difference of the vault unit according to a plurality of the delta TaAverage unit vault temperature difference
Ta+nRepresents the burning time taDome temperature at the last n unit durations, n being a positive integer;
step S40: according to
Calculating the budget vault temperature TaAccording to said budget vault temperature Ta' and the expected vault temperature TEThe deviation of the air flow rate of the hot blast stove is adjusted.
Wherein, the step S10 is to obtain the temperature of the air supply from the hot blast stove to the blast furnaceDetecting the realization of air supply of a hot blast stove supplying air to a blast furnace; the target blast temperature of the blast furnace may be set. When the sensor is adopted to detect the air supply temperature, the expected vault temperature T of the final burning state of the hot blast stove is obtainedEThe method comprises the steps of reading the vault temperature at the end of burning as the next hot blast stove combustion control to output the expected vault temperature T corresponding to the air supply temperature according to the vault temperature-time curve when the hot blast stove which is supplying air is in the burning stateE. When the air supply temperature is the air supply temperature required by the blast furnace, the vault temperature of the burning end state can be read as the expected vault temperature T according to the historical vault temperature-time curve of burning, stewing and air supply of the hot blast furnaceE. And then according to the expected vault temperature TESetting the expected furnace burning time teAnd for different expected vault temperatures, the vault temperature rise is different, and the proper expected furnace burning time is set within the safety range allowed by the vault temperature rise rate.
Step S30: detecting real-time vault temperature of the hot-blast stove in a burning state, and calculating unit vault temperature difference according to a plurality of groups of real-time vault temperatures; illustratively, the real-time dome temperature is TaAnd the current hot blast stove starts to burn to detect the real-time vault temperature TaThe time of the furnace burning is taThen sequentially in a burning furnace ta+1Real-time vault temperature T detected after a long timea+1… … in the burning furnace ta+n+1Real-time vault temperature T detected after a long timea+n+1Then Δ Ta＝Ta+n+1-Ta+nCalculating the temperature difference of the vault unit, calculating the temperature differences of a plurality of vault units by analogy, and calculating the average temperature difference of the vault unit according to the average value of the temperature differences of the vault units
In the above formula, n is a positive integer, the unit vault temperature difference refers to a difference value of real-time vault temperatures detected every other unit time, and the unit time can be set to 1 minute or 3 minutes or 5 minutes, so that the budget vault temperature of the end state of the furnace burning can be estimated according to the currently detected real-time vault temperature, the average unit vault temperature difference and the remaining furnace burning time length.
Step S40 is based on the real-time dome temperature TaTime t of burningaAverage unit vault temperature difference Ta' and expected burning time teCalculating the budget vault temperature T after the expected furnace burning timea', so as to budget the vault temperature Ta' and expected vault temperature TEThe deviation of the air flow rate of the hot blast stove and the flow rate of combustion air are adjusted in real time, and the budget vault temperature T is reduceda' and expected vault temperature TEThe difference value of (1) not only avoids the temperature of the vault from being over-heated, maintains the automatic and safe operation of the hot blast stove, but also ensures that the air supply temperature of the hot blast stove meets the air consumption requirement of the blast furnace when the stove is burnt and the braising is finished. The timing cycle executes the steps S30 and S40 until the furnace burning is finished.
In particular, the vault temperature T is budgeteda' and expected vault temperature TEThe process of regulating the gas flow and the combustion air flow of the hot blast stove by the deviation of (2) is as follows: firstly according to the expected vault temperature TESetting a reasonable deviation range, such as +/-3%, and when the calculated estimated vault temperature according to the parameters such as the currently detected real-time vault temperature and the like is too high and exceeds the upper limit value of the expected vault temperature, indicating that the average unit vault temperature difference is too high, namely the temperature rise of the vault temperature in unit time is too high, the combustion level of the hot blast stove needs to be reduced, and the method can be realized by reducing the gas flow of the hot blast stove or increasing the combustion air flow of the current hot blast stove. If the budget vault temperature calculated according to the currently detected real-time vault temperature and other parameters is too small and lower than the upper limit value of the expected vault temperature, the average unit vault temperature difference is too small, namely the temperature rise of the vault temperature in unit time is too small, combustion needs to be enhanced, and at the moment, the gas flow of the hot blast stove can be increased or the combustion-supporting air flow can be reduced. The method comprises the steps of obtaining the budget vault temperature of the burning furnace end state by detecting the current vault temperature in real time and calculating the average unit vault temperature difference, adjusting the burning of the hot blast stove in real time according to the difference value of the budget vault temperature and the expected vault temperature, correcting deviation in time, realizing automatic burning control of the hot blast stove, and avoiding burning of the hot blast stoveThe vault temperature overtemperature is avoided, and the stability of the air supply temperature is guaranteed. In the process of collecting, calculating and controlling, the information of the corresponding sensor can be collected by the PLC and transmitted to the computer, and the computer performs operation processing and controls the automatic operation of the hot blast stove according to the processing structure.
Further, in the above embodiment, before detecting the real-time vault temperature of the hot blast stove, the current operation state of the hot blast stove, that is, the burning state, the smoldering state, or the air supply state is determined, and the determination of the hot blast stove state may be performed according to the state of a corresponding valve, that is, the burning state, and the corresponding valve of the branch pipe gas and the branch pipe air is in the open state; the blast valve for supplying air to the blast furnace is closed in the state of burning and stewing, and the corresponding valves of the branch pipe gas and the branch pipe air are closed in the state of stewing; the blast valve of the hot blast stove for supplying air to the blast furnace is opened in the air supply state. The PLC can judge the current running state of the hot blast stove by collecting the state information of the corresponding valve.
And if the hot blast stove is in the stewing and air supply states, stopping the procedures of detecting, calculating and controlling the stove burning. If the hot blast stove is in an air supply state, preferably collecting the current air supply temperature, and controlling the hot blast stove which switches the current air supply of the hot blast stove to the next braising state for standby air supply to supply air when the air supply temperature does not meet the air requirement of the blast furnace after the air supply lasts for a period of time. And if the hot blast stove is in a burning state, calculating the budget vault temperature according to the detection, calculation and control burning degree, the real-time vault temperature, the average unit vault temperature difference and the residual burning time, so as to adjust the gas flow and the combustion air flow according to the difference value of the budget vault temperature and the expected vault temperature.
As shown in fig. 3, the burning furnace is divided into 1 section of the burning furnace, namely the initial stage of the burning furnace and the burning furnace according to the characteristic of the vault temperature rise, the temperature difference of the unit vault of the 1 section of the burning furnace is large, and the calculation of the budget vault temperature brought into the 1 section of the burning furnace obviously causes the budget vault temperature to be larger, so the method for controlling the combustion of the heat accumulating type hot blast furnace further comprises the step of controlling the combustion of the heat accumulating type hot blast furnace according to the first occurrence of delta TaThe corresponding time less than or equal to 0 is used as the boundary of the section 1 and the section 2 of the burning furnace, and the initial burning time t is confirmed1I.e. when the furnace 1 section is heatedMeanwhile, the initial furnace burning time t is obtained1Corresponding initial vault temperature T1。
When the real-time vault temperature is detected, the unit vault temperature difference and the budget vault temperature are calculated, whether the current furnace burning time is in the time corresponding to the furnace burning 1 section or not is judged, if the current furnace burning time is in the furnace burning 1 section, the calculation of the budget vault temperature is stopped, and the existing combustion state is kept; if the current furnace burning time exceeds the initial furnace burning time t1Then according to
Calculating the budget vault temperature Ta', then using Ta' and TEThe combustion of the hot blast stove is adjusted by the deviation, namely the combustion control of the hot blast stove is mainly centralized on the section 2 of the burning furnace, and the section 1 of the burning furnace burns according to the fixed opening degree of the branch pipe gas and the opening degree of the branch pipe air.
Further, the combustion control of the 2 sections of the hot blast stove burning furnace not only refers to the deviation between the budget vault temperature and the expected vault temperature, but also refers to the temperature difference delta T of the two sections of unit vaults2The temperature difference of the two-stage unit vault is within a set temperature difference range, and if the temperature difference of the two-stage unit vault is delta T2If the upper limit of the allowable temperature difference is larger than the set upper limit, reducing the gas flow of the current hot blast stove or increasing the combustion air flow of the current hot blast stove; if the temperature difference delta T of the two-section unit vault2If the lower limit of the allowable temperature difference is set, the gas flow of the current hot blast stove is increased or the combustion air flow of the current hot blast stove is reduced.
In the above embodiment, the control of the combustion of the hot blast stove is mainly realized by adjusting the opening degree of the branch pipe gas, the opening degree of the branch pipe air and the air-fuel ratio, and under necessary conditions, the opening degree of the main pipe gas can be adjusted. The regulation principle for increasing the gas flow of the current hot blast stove or reducing the combustion air flow of the current hot blast stove is as follows: the regulating frequency of the branch pipe gas opening and the branch pipe air opening is 1 time/1 min, and the opening of the main pipe gas is properly reduced to 1 time/5 min. When the air limit value is met (namely the branch pipe air opening reaches the limit of 95% or the air-fuel ratio upper limit), the branch pipe gas opening is gradually increased until the branch pipe gas opening reaches 95% or the air-fuel ratio lower limit, and when the branch pipe gas opening reaches 95% or the air-fuel ratio lower limit and the combustion of the hot blast stove is still insufficient to enable the estimated vault temperature to exceed the lower limit of the expected vault temperature, the main pipe gas opening is continuously increased to the upper limit opening of 95% and early warning is carried out. The opening degrees of the branch pipe gas starting end, the branch pipe air starting end and the main pipe gas can be set to be 1% -3% of the current opening degree. The step of reducing the gas flow of the current hot blast stove or increasing the combustion air flow of the current hot blast stove refers to the following adjustment process for adjustment, and the difference is that the gas flow of the hot blast stove is reduced, the branch pipe gas opening degree is firstly reduced or the branch pipe air opening degree is increased to the air-fuel ratio until the air-fuel ratio upper limit is reached, and when the operation result is that the estimated vault temperature exceeds the upper limit of the expected vault temperature after the air-fuel ratio upper limit is reached, early warning can be carried out to prompt people to participate in the adjustment.
In a further embodiment of the present application, the step of calculating the difference between the vault temperature and the expected vault temperature by calculating the budget vault temperature and comparing the calculated vault temperature and the expected vault temperature further includes step S50: according to
That is to say
Calculating the estimated furnace burning time t for reaching the expected vault temperaturexAt a preset furnace burning time txExceeding the set expected burning time teImmediately returns to step S30 and step S40 to calculate the budget vault temperature Ta' and regulating the gas flow and the combustion air flow to control the combustion so that the hot blast stove is close to the expected burning time teReaches the desired dome temperature TEThe automatic safe operation of the hot blast stove is realized and the air supply temperature is ensured. If the furnace burning time t is presetxAt the set expected burning time teWithin the range of the limit deviation, the cycles of S50-S30-S40-S50 are executed regularly until the furnace burning is finished. It should be noted that the furnace burning time is estimatedTime txIt should also be performed in the furnace 2 section.
The following mark is 1080m3The blast furnace is provided with three Kalu top combustion hot blast stoves, and can meet the requirement of 1150-1250 deg.c blast temperature. The hot blast stove mainly uses two-burning one-sending as main part and also can use one-burning two-sending, and a working system of one-burning one-sending one-smoldering is adopted in special cases. The operation process of the heat accumulating type hot blast stove combustion control method applied to the embodiment of the application is as follows:
extracting field parameters through a PLC: real-time vault temperature TaAir supply temperature, coal gas opening degree Km, air opening degree Ko, air-fuel ratio and running state (furnace burning, furnace stewing and air supply) to obtain expected vault crown temperature TEAnd setting the expected furnace burning time as data which can be processed by a computer program.
Calculating key parameters. If the expected furnace burning time is set to be 120min in the first step, key parameters such as unit vault temperature difference, average unit vault temperature difference, budget vault temperature and the like are programmed and calculated.
Calculating the temperature difference delta T of the unit vault of the 1 section of the burning furnace1；
Calculating average unit vault temperature difference of 1 section of burning furnace
Confirming the vault temperature T of 1 section of the burning furnace1(judgment condition: first occurrence of temperature difference Δ T per dome1≤0)；
Confirming the burning time t of 1 section of the burning furnace1；
Calculating the temperature difference delta T of the unit vault of 2 sections of the burning furnace2；
Calculating average unit vault temperature difference of 2 sections of burning furnace
Budget vault temperature
And (5) comprehensively analyzing and judging. Setting the minimum air supply temperature to 1150 ℃, the expected vault temperature to 1310 ℃, the allowable fluctuation to +/-10 ℃, the allowable vault temperature difference to +/-5 ℃/min in 2 sections, the upper air-fuel ratio limit to 3.2 and the lower air-fuel ratio limit to 1.2, and carrying out comprehensive analysis according to logic principle programming:
when the operation state is braising, the calculation, analysis and judgment program stops;
when the operation state is air supply and the air supply temperature is less than or equal to the minimum air supply temperature, the furnace is automatically changed for air supply or early warning is prompted for furnace change.
When the operation state is furnace burning, the furnace burning 1 section calculation, analysis and judgment program stops; 2, starting a calculation, analysis and judgment program, estimating the vault temperature within an expected vault temperature allowable fluctuation range, and burning 2 sections of unit vault temperature difference delta T of the furnace2Within the range of the allowed temperature difference, the judgment can be normal, otherwise, the judgment can be abnormal.
And (4) regulating and controlling parameters in real time, calculating and giving an accurate suggestion of reasonably regulating and controlling the field parameters when the comprehensive judgment result is abnormal, and then automatically and timely regulating to achieve the purpose of pre-controlling the vault temperature and the air supply temperature. The specific regulation and control operations are as follows:
(1) budget vault temperature < lower limit of allowable fluctuation of expected vault temperature, or unit vault temperature difference delta T of 2 sections of burning furnace2If the temperature difference is lower than the allowable temperature difference lower limit, judging the abnormality, calculating and displaying the suggested gas opening and the suggested air opening, and automatically adjusting the gas opening and the air opening.
Calculating an adjustment principle: when meeting an air limit value (the opening degree of the branch pipe air reaches the upper limit of 95 percent or the air-fuel ratio reaches the upper limit), the opening degree of the corresponding branch pipe gas is increased (the original opening degree is 3 percent) according to 1 time/min until the opening degree of the branch pipe gas reaches the upper limit of 95 percent or the air-fuel ratio lower limit; when the gas opening limit value is met (the gas opening of the branch pipe reaches the upper limit of 95 percent or the air-fuel ratio reaches the lower limit), the gas opening of the main pipe is increased (the original opening is 3 percent) according to 1/5 min until the gas opening of the main pipe reaches the upper limit of 95 percent, the interface displays early warning, and human intervention is prompted.
(2) Budget vault temperature > upper limit of allowable fluctuation of expected vault temperature, or unit vault temperature difference delta T of 2 sections of burning furnace2If the temperature difference is larger than the upper limit of the allowable temperature difference, judging the abnormality, calculating and displaying the suggested gas opening degree and the suggested air opening degree, and automatically adjusting the gas opening degreeAnd air opening.
Calculating an adjustment principle: 1 time/min, firstly, the opening degree of the gas of the corresponding branch pipe is adjusted downwards (the original opening degree is 3 percent) or the opening degree of the air of the corresponding branch pipe is adjusted upwards (the original opening degree is 3 percent) until the upper limit of the air-fuel ratio is reached; and synchronously reducing the gas opening (original opening x 3%) and the air opening (original opening x 3%) of the corresponding branch pipe.
Actual operation steps: (1) when the system judges that the system is abnormal, automatic operation adjustment is carried out according to the suggested gas opening and air opening. (2) When the system prompts the early warning of furnace changing, automatic or manual furnace changing operation is carried out. (3) According to the change of actual production conditions, reasonable threshold values of 'expected furnace burning time, lowest air supply temperature, expected vault temperature and allowed fluctuation, allowed temperature difference of 2 sections of the furnace burning, upper air-fuel ratio limit and lower air-fuel ratio limit' can be adjusted manually in due time.
It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The combustion control method of the heat accumulating type hot blast stove provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A combustion control method for a heat accumulating type hot blast stove is characterized by comprising the following steps:
acquiring the air supply temperature of the hot blast stove to the blast furnace, and acquiring the expected vault temperature T of the burning end state of the hot blast stove according to the air supply temperatureE；
Setting the expected burning time te；
Detecting real-time vault temperature of hot-blast stove in burning stateDegree TaAnd the furnace burning time t of the current furnace burningaAccording to Δ Ta＝Ta+n+1-Ta+nCalculating the temperature difference of the vault unit and calculating the temperature difference of the vault unit according to a plurality of the delta TaAverage unit vault temperature difference
Ta+nRepresents the burning time taDome temperature at the last n unit durations, n being a positive integer;
according to
Calculating the budget vault temperature TaAccording to said budget vault temperature Ta' and the expected vault temperature TEThe deviation of the air flow rate of the hot blast stove is adjusted.
2. A method of controlling combustion in a regenerative hot blast stove according to claim 1, characterised in that the vault temperature T is calculated according to the budgeta' and the expected vault temperature TEThe step of regulating the gas flow and the combustion air flow of the hot blast stove by the deviation comprises the following steps:
according to the expected vault temperature TESetting a deviation range;
if the budget dome temperature Ta' less than the expected vault temperature TEIncreasing the gas flow of the current hot blast stove or reducing the combustion air flow of the current hot blast stove;
if the budget dome temperature Ta' greater than said expected vault temperature TEThe upper limit value of the air flow rate of the hot blast stove is reduced or the combustion air flow rate of the hot blast stove is increased.
3. A method of controlling combustion in a regenerative hot blast stove according to claim 1 or 2, characterised in that the method is based on
Calculating the budget vault temperature TaThe step of' further comprising:
confirming the first appearance of the Delta T from the start of the furnace burningaInitial furnace burning time t less than or equal to 01And obtaining the initial stage furnace burning time t1Corresponding initial vault temperature T1；
If the current furnace burning time taIn the initial stage of furnace burning time t1If not, stopping calculating the budget vault temperature Ta′；
If the current furnace burning time taExceeds the initial stage furnace burning time t1Then according to
Calculating the budget dome temperature Ta′。
4. A method of controlling combustion in a regenerative hot blast stove according to claim 3, further comprising controlling combustion according to Δ T2＝Ta+n+1-Ta+nCalculating the initial furnace burning time t1To the set expected furnace burning time teTwo-stage unit vault temperature difference delta T in time period2；
If the temperature difference delta T of the two-section unit vault2If the upper limit of the allowable temperature difference is larger than the set upper limit, reducing the gas flow of the current hot blast stove or increasing the combustion air flow of the current hot blast stove;
if the temperature difference delta T of the two-section unit vault2If the lower limit of the allowable temperature difference is set, the gas flow of the current hot blast stove is increased or the combustion air flow of the current hot blast stove is reduced.
5. A method of combustion control in a regenerative hot blast stove according to claim 2 or 4, characterised in that the step of increasing the gas flow or decreasing the combustion air flow of the current hot blast stove comprises:
when the air opening of the branch pipe reaches 95% or reaches the upper limit of the air-fuel ratio, gradually increasing the gas opening of the branch pipe until the gas opening of the branch pipe reaches 95% or the lower limit of the air-fuel ratio;
when the gas aperture of the branch pipe reaches 95% or the lower limit of the air-fuel ratio, the gas aperture of the main pipe is gradually increased to 95%, and early warning is carried out when the gas aperture of the main pipe reaches 95%.
6. A method of controlling combustion in a regenerative hot blast stove according to claim 5 further comprising calculating the expected burning time teSetting the deviation range of the expected furnace burning time according to
That is to say
Calculating and budgeting furnace burning time tx；
If the estimated furnace burning time txExceeding the expected burning time teIs calculated, the calculated average unit vault temperature difference is cyclically executed
And according to
Calculating the budget vault temperature TaAccording to said budget vault temperature Ta' and the expected vault temperature TERegulating the gas flow and the combustion air flow of the hot blast stove by the deviation of the air flow.
7. The combustion control method of a regenerative hot blast stove according to claim 5, wherein the regulating frequency of the branch pipe gas opening and the branch pipe air opening are both 1 time/1 min; the adjusting frequency of the gas opening of the main pipe is 1 time/5 min.
8. A method for controlling combustion in a regenerative hot blast stove according to claim 7, characterised in that the branch gas opening and the branch air opening are both adjusted in a range of 1% to 3% of their current openings.
9. A method of controlling combustion in a regenerative hot blast stove according to claim 1, characterised in that the real time dome temperature T of the hot blast stove in the fired state is detectedaAnd the current furnace burning time taBefore the step (2) further comprising: judging the current state of the hot blast stove, and if the hot blast stove is in a burning state, continuing to detect the real-time vault temperature T of the hot blast stove in the burning stateaAnd the current furnace burning time taA step (2);
if the hot blast stove is in a smoldering state or an air supply state, stopping executing the real-time vault temperature T of the hot blast stove in the burning stateaAnd the current furnace burning time taThe step (2).
10. The combustion control method of a regenerative hot blast stove according to claim 9, wherein when the hot blast stove is in a blast state, a current blast temperature is detected, and if the blast temperature is lower than a lower limit value of a blast temperature required by the blast furnace, another hot blast stove in a smoldering state is switched to perform blast.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115069781A (en) * | 2022-06-06 | 2022-09-20 | 福建三宝钢铁有限公司 | Controlled rolling and controlled cooling production process of HRB400E nuclear power steel |
| CN116358170A (en) * | 2023-06-01 | 2023-06-30 | 南京普兰特换热设备有限公司 | Automatic regulation and control gas hot-blast stove and gas hot-blast stove regulation and control method |
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| CN110716597A (en) * | 2019-10-31 | 2020-01-21 | 中冶赛迪重庆信息技术有限公司 | Method, system and equipment for controlling vault temperature in combustion process of hot blast stove |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106011352A (en) * | 2016-07-25 | 2016-10-12 | 江苏和隆优化能源科技有限公司 | Optimized control system for coal gas flow of blast-furnace hot blast stove |
| CN110716597A (en) * | 2019-10-31 | 2020-01-21 | 中冶赛迪重庆信息技术有限公司 | Method, system and equipment for controlling vault temperature in combustion process of hot blast stove |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115069781A (en) * | 2022-06-06 | 2022-09-20 | 福建三宝钢铁有限公司 | Controlled rolling and controlled cooling production process of HRB400E nuclear power steel |
| CN115069781B (en) * | 2022-06-06 | 2024-04-12 | 福建三宝钢铁有限公司 | Rolling and cooling control production process of HRB400E nuclear power steel |
| CN116358170A (en) * | 2023-06-01 | 2023-06-30 | 南京普兰特换热设备有限公司 | Automatic regulation and control gas hot-blast stove and gas hot-blast stove regulation and control method |
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