CN108507365B - Ignition optimization control method of sintering machine - Google Patents
Ignition optimization control method of sintering machine Download PDFInfo
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- CN108507365B CN108507365B CN201810299083.7A CN201810299083A CN108507365B CN 108507365 B CN108507365 B CN 108507365B CN 201810299083 A CN201810299083 A CN 201810299083A CN 108507365 B CN108507365 B CN 108507365B
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- 238000005245 sintering Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000005457 optimization Methods 0.000 title claims abstract description 19
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 236
- 239000003345 natural gas Substances 0.000 claims abstract description 118
- 239000007789 gas Substances 0.000 claims description 13
- 238000004364 calculation method Methods 0.000 claims description 3
- 239000000446 fuel Substances 0.000 abstract description 13
- 238000002485 combustion reaction Methods 0.000 abstract description 9
- 239000002699 waste material Substances 0.000 abstract description 8
- 239000000203 mixture Substances 0.000 description 6
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000009770 conventional sintering Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangement of monitoring devices; Arrangement of safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0006—Monitoring the characteristics (composition, quantities, temperature, pressure) of at least one of the gases of the kiln atmosphere and using it as a controlling value
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
- F27D2019/0034—Regulation through control of a heating quantity such as fuel, oxidant or intensity of current
- F27D2019/004—Fuel quantity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangement of monitoring devices; Arrangement of safety devices
- F27D2021/0057—Security or safety devices, e.g. for protection against heat, noise, pollution or too much duress; Ergonomic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses an ignition optimization control method of a sintering machine, which comprises the following steps: the valves for controlling the natural gas and the air flow are respectively connected with a PLC/DCS system, PID closed loop control is adopted, a flow follow-up regulation mode is utilized, the set air flow is obtained by setting the air-fuel ratio and the natural gas flow according to the natural gas flow multiplied by the air-fuel ratio, then the set air flow enters an ignition temperature control mode, a new natural gas flow target value is calculated according to the deviation of the target temperature and the current temperature, then the new natural gas flow target value enters an ignition intensity control module to obtain a current ignition intensity, then the target ignition intensity is given according to the current ignition intensity, the natural gas flow required to be achieved is obtained according to the target ignition intensity, and then the air flow is obtained according to the air-fuel ratio. The invention avoids the waste or flameout phenomenon of natural gas, simultaneously ensures the stability of PID closed-loop control in the adjusting process, and prevents unstable combustion, so that the operation of the sintering machine is safer, more reliable and more stable.
Description
Technical Field
The invention relates to the technical field of control of sintering machines, in particular to an ignition optimization control method of a sintering machine.
Background
The sintering production process is to add a certain proportion of solvent and fuel into iron ore powder, mix the mixture and sinter the mixture into raw materials required by a blast furnace at a certain temperature, the main process comprises the steps of feeding, proportioning, mixing, sintering, cooling, granulating and the like, and considering that the sintering process is a continuous production process, the process has many links, complex control objects, long pure lag time and many interference factors, the automatic control of the production process of the sintering machine is required, in particular the ignition optimization control of the sintering machine. Currently, ignition control methods for a conventional sintering machine use a valve opening control method and a closed-loop PID control method. According to the process requirement, the flow of natural gas and air is controlled by the opening degree of the valve, so that great instability factors exist, waste is great, and the simple PID closed-loop control has unstable fluctuation adjustment in the adjustment process.
In patent No. CN206330430U, a series of controllers and mechanisms such as an ignition temperature regulator, a combustion optimization regulator, an air-fuel ratio regulator, a natural gas flow controller, and an air flow controller are used, the combustion optimization regulator optimizes and corrects the natural gas flow rate in the combustion process by analyzing process parameters such as raw material quality, and the air-fuel ratio regulator takes into account a big data experience value of the device through the combustion optimization regulator, so as to achieve combustion optimization operation of the ignition furnace of the sintering machine.
disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
It is still another object of the present invention to provide an ignition optimization control method for a sintering machine, which avoids the waste of natural gas or flameout phenomenon, and simultaneously ensures the stability of PID closed-loop control during the adjustment process, and prevents unstable combustion, so that the operation of the sintering machine is safer, more reliable and more stable.
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided an ignition optimization control method of a sintering machine, comprising:
step 1, manual adjustment, wherein valves for controlling the natural gas flow and the air flow are respectively connected with a PLC/DCS system, and PID closed-loop control is adopted to adjust the natural gas flow and the air flow to initial target values.
And 2, after the manual adjustment is carried out to the initial target value, adopting a flow follow-up adjustment mode, namely setting the ratio K1 of the natural gas flow to the air flow, and then setting the natural gas flow, wherein the air flow is adjusted in a follow-up manner according to the natural gas flow and the K1 value.
And 3, when the flow follow-up regulation in the step 2 is stable, starting a temperature control mode, namely calculating a new natural gas flow target value according to the deviation between the target temperature and the current temperature, and then adjusting the air flow according to the flow follow-up regulation method in the step 2, wherein the calculation method of the new natural gas flow target value is according to a formula 1:
Formula 1 Gas _ sp ═ K ═ Taim/Tcur ═ Gas _ pv
Wherein Gas _ sp is a new target value of the natural Gas flow; taim is the set target temperature; tcur is the current temperature; gas _ pv is the current value of the natural Gas flow; k is a correction coefficient.
Step 4, after the temperature control mode in the step 3 is stable, starting an ignition intensity control mode again to obtain a current ignition intensity value, judging whether the current ignition intensity value meets a temperature value required to be reached, if so, keeping the current ignition intensity value unchanged, and maintaining the current natural gas and air flow state; if not, the step 5 is entered.
and 5, giving a new ignition intensity value according to the current ignition intensity value, solving the natural gas flow required to be achieved, and calculating the air flow according to the method in the step 2.
Preferably, the PLC/DCS system controls the opening of the valve using a current of 4 to 20mA in step 1.
Preferably, in the process of adjusting the natural gas flow to the set natural gas flow in step 2, the adjustment amount of the single natural gas has an amplitude limit, where the amplitude limit is: 200m 3/h.
In the process of adjusting the current value of the natural gas flow to the target natural gas flow in the step 3, the adjustment amount of the single natural gas has an amplitude limit, and the amplitude limit is as follows: 200m 3/h.
Preferably, the current temperature in step 3 is an average value of temperatures measured by 3 thermocouple in the hearth of the sintering machine.
preferably, in any one of the flow rate follow-up adjustment mode, the temperature control mode, and the ignition intensity control mode, the PLC/DCS system starts an alarm system when the pressure of the natural gas is less than or equal to 2000 Pa.
Preferably, in any one of the flow rate follow-up adjustment mode, the temperature control mode, and the ignition intensity control mode, when the pressure of the natural gas is less than or equal to 1500Pa, the PLC/DCS system shuts off the ignition system, reduces the flow rate of the air to 30% of a normal value, stops the operation of the sintering machine, temporarily stops the operation of the conveying end equipment connected to the sintering machine, and performs an alarm prompt, with the stop time being set to 3 to 6 minutes.
Preferably, the sintering machine comprises an ignition furnace, and when the machine speed of the sintering machine is less than 0.5m/min during the operation stop of the sintering machine and the conveying end equipment connected with the sintering machine, the natural gas flow is at the lower limit value, and the lower limit value is 200m3/h-500m 3/h.
Preferably, the K1, the natural gas flow set value, the target ignition temperature and the target ignition intensity are protected by limit values, which are respectively: 8-12; 700-1500m 3/h; 900 ℃ and 1200 ℃; 40-90MJ/m 2.
The invention at least comprises the following beneficial effects:
firstly, a flow follow-up adjusting mode is utilized, a set air flow rate mode is obtained by manually setting an air-fuel ratio K1 and a natural gas flow rate, set natural gas and air flow rates are respectively input at input ends, and the primary operation of an ignition furnace of a sintering machine is started; after the flow follow-up regulation mode is stable, the ignition temperature control mode is entered, a new natural gas flow target value which can be further regulated is calculated by mainly utilizing the current value of the natural gas in the stable state, namely the natural gas flow set in the follow-up control mode and the set target temperature, and then the current natural gas and the current air flow are further corrected according to the target natural gas flow multiplied by the air-fuel ratio which is equal to the target air flow.
After the ignition temperature control mode is stable, entering an ignition intensity control module, wherein the ignition intensity refers to the heat quantity obtained by the mixture in unit area in the ignition process, obtaining a current ignition intensity according to a measurable known quantity, and maintaining the current natural gas and air flow under the condition that the current ignition temperature is met; when current ignition temperature is unsatisfied, again according to current ignition intensity, by operating personnel according to current ignition intensity, give target ignition intensity, again according to target ignition intensity back-propulsion need reach's natural gas flow, the air-fuel ratio of reunion seeks required air flow, and adjust to the flow value of required natural gas and air, and the aperture control natural gas flow and the air flow through the valve, avoid the waste or the flame-out phenomenon of natural gas, guarantee PID closed-loop control's stability in accommodation process simultaneously, prevent the burning unstability, so that the operation of sintering machine is safer, reliable and stable.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 is a flowchart of an ignition optimization control method for a sintering machine according to the present invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
as shown in fig. 1, the present invention provides an ignition optimization control method for a sintering machine, comprising:
Step 1, manual adjustment, wherein valves for controlling the natural gas flow and the air flow are respectively connected with a PLC/DCS system, and PID closed-loop control is adopted to adjust the natural gas flow and the air flow to initial target values.
And 2, after the manual adjustment is carried out to the initial target value, adopting a flow follow-up adjustment mode, namely setting the ratio K1 of the natural gas flow to the air flow, and then setting the natural gas flow, wherein the air flow is adjusted in a follow-up manner according to the natural gas flow and the K1 value.
And 3, when the flow follow-up regulation in the step 2 is stable, starting a temperature control mode, namely calculating a new natural gas flow target value according to the deviation between the target temperature and the current temperature, and then adjusting the air flow according to the flow follow-up regulation method in the step 2, wherein the calculation method of the new natural gas flow target value is according to a formula 1:
Formula 1 Gas _ sp ═ K ═ Taim/Tcur ═ Gas _ pv
Wherein Gas _ sp is a new target value of the natural Gas flow; taim is the set target temperature; tcur is the current temperature; gas _ pv is the current value of the natural Gas flow; k is a correction coefficient.
Step 4, after the temperature control mode in the step 3 is stable, starting an ignition intensity control mode again to obtain a current ignition intensity value, judging whether the current ignition intensity value meets a temperature value required to be reached, if so, keeping the current ignition intensity value unchanged, and maintaining the current natural gas and air flow state; if not, the step 5 is entered.
And 5, giving a new ignition intensity value according to the current ignition intensity value, solving the natural gas flow required to be achieved, and calculating the air flow according to the method in the step 2.
In the scheme, firstly, a valve signal for controlling the natural gas and the air flow is connected with a PLC/DCS system, the opening degree of the valve is in a PID closed-loop control system, errors caused by manual adjustment are avoided, system feedback is obtained in real time through the PID closed-loop system, and further flow adjustment is carried out according to the feedback value; in the adjustment process of the valve, the on-site manual debugging error is required to be less than 1%, the natural gas debugging error is required to be less than 5%, and the waste of the natural gas is avoided.
By utilizing a flow follow-up adjusting mode, a set air flow rate mode is obtained by manually setting an air-fuel ratio K1 and a natural gas flow rate, and the set natural gas and air flow rates are respectively input at input ends to start the primary operation of the ignition furnace of the sintering machine; after the flow follow-up regulation mode is stable, the ignition temperature control mode is entered, a new natural gas flow target value which can be further regulated is calculated by mainly utilizing the current value of the natural gas in the stable state, namely the natural gas flow set in the follow-up control mode and the set target temperature, and then the current natural gas and the current air flow are further corrected according to the target natural gas flow multiplied by the air-fuel ratio which is equal to the target air flow. Wherein the range of K1 is 8-12, and the value range of K in formula 1 is 0.8-1.5.
After the ignition temperature control mode is stable, entering an ignition intensity control module, wherein the ignition intensity refers to the heat quantity obtained by the mixture in unit area in the ignition process, obtaining a current ignition intensity by using a formula 2 according to a measurable known quantity, and maintaining the current natural gas and air flow under the condition that the current ignition temperature is met; when current ignition temperature is unsatisfied, again according to current ignition intensity, by operating personnel according to current ignition intensity, give target ignition intensity, again according to target ignition intensity back-propulsion need reach's natural gas flow, the air-fuel ratio of reunion seeks required air flow, and adjust to the flow value of required natural gas and air, and the aperture control natural gas flow and the air flow through the valve, avoid the waste or the flame-out phenomenon of natural gas, guarantee PID closed-loop control's stability in accommodation process simultaneously, prevent the burning unstability, so that the operation of sintering machine is safer, reliable and stable.
Equation 2
Wherein J is the firing strength MJ/m 2; q is the heat supply MJ/h of the ignition section; speedcur is the speed m/min of the trolley; WSinter is trolley width m; gas _ flowcur is the natural gas flow rate m 3/h; cal _ v is natural gas heating value 32Mj/m 3.
In a preferable scheme, the PLC/DCS system in the step 1 controls the opening degree of the valve by adopting a current of 4-20 mA.
In the scheme, the amplitude of the noise voltage of the sintering machine working site can reach several V, but the power of the noise is very weak, so that the current is insensitive to the noise, the stability of a current signal in the transmission process can be ensured, the opening of the valve is controlled by adopting the current of 4-20mA, the accuracy and the non-interference of the transmitted signal can be ensured, and the opening error of the valve is reduced to the minimum.
In a preferable scheme, in the process of adjusting the natural gas flow to the set natural gas flow in step 2, the adjustment amount of the single natural gas has an amplitude limit, where the amplitude limit is: 200m 3/h.
In the process of adjusting the current value of the natural gas flow to the target natural gas flow in the step 3, the adjustment amount of the single natural gas has an amplitude limit, and the amplitude limit is as follows: 200m 3/h.
In the scheme, the current natural gas flow value is adjusted to a set natural gas flow value and the current value of the natural gas flow is adjusted to the target natural gas flow, the adjustment amount of single natural gas is required to be set within a certain range in the adjustment process so as to ensure the combustion stability of the mixture in the sintering machine furnace, and when the flow of the single natural gas is more than or equal to 200m3/h, the output value is limited to 200m 3/h; when the flow rate of the single natural gas is less than 200m3/h, the flow rate value of the natural gas is directly output.
In a preferable scheme, the current temperature in the step 3 is an average value of temperatures measured by 3 thermocouple in the hearth of the sintering machine.
In the scheme, the temperature in the hearth is detected through the thermocouples distributed in the sintering machine furnace, and the values of the temperatures detected by the 3 thermocouples are averaged to ensure the accuracy of the current temperature determination.
in a preferable scheme, in any one of the flow rate follow-up adjustment mode, the temperature control mode and the ignition intensity control mode, when the pressure of the natural gas is less than or equal to 2000Pa, the PLC/DCS system starts an alarm system.
in the scheme, when the pressure of the natural gas is less than or equal to 2000Pa, the PLC/DCS system starts an alarm system to inform operators to adjust the pressure of the natural gas in time, so that the stable operation of the sintering machine is ensured.
In a preferable scheme, in any one of the flow rate follow-up adjustment mode, the temperature control mode and the ignition intensity control mode, when the pressure of the natural gas is less than or equal to 1500Pa, the PLC/DCS system cuts off an ignition system, reduces the flow rate of the air to 30% of a normal value, stops the operation of the sintering machine, temporarily stops the operation of conveying end equipment connected with the sintering machine, and performs alarm prompt, wherein the stop time is set to be 3-6 minutes.
In the scheme, the DCS/PLC system automatically cuts off the ignition system, the quick cut-off valve and the automatic connecting rod quick cut-off valve are closed, the ignition air flow is automatically adjusted to 30% of a normal value, and an electric interlocking signal is sent. And stopping the operation of the sintering machine according to the interlocking signal, stopping the operation of upstream equipment (round rollers and nine rollers) along with the operation of the upstream equipment, carrying out alarm prompt on a picture, carrying out emergency treatment on a batching system, judging according to a stock signal, and automatically stopping the operation of the upstream equipment according to the interlocking if the upstream equipment is not treated after 5 minutes, so that the waste of resources is prevented, and the good and stable operation of the sintering machine is ensured.
In a preferable scheme, the sintering machine comprises an ignition furnace, and when the machine speed of the sintering machine is less than 0.5m/min during the operation stop of the sintering machine and conveying end equipment connected with the sintering machine, the natural gas flow is at a lower limit value, wherein the lower limit value is 200m3/h-500m 3/h.
In the scheme, in the process of temporary shutdown, when the machine speed of the sintering machine is less than 0.5m/min, the natural gas flow needs to be adjusted, so that the ignition furnace of the sintering machine is in the working state with the lowest load, at the moment, the natural gas flow is at a lower limit value, the lower limit value needs to ensure that the ignition furnace does not flameout, the time for restarting the operation of the sintering machine is shortened, the stability of the operation of the sintering machine is facilitated, the lower limit value needs to be confirmed in the specific situation on site, and the set value can be adjusted on the picture of an upper computer.
In a preferred embodiment, the K1, the natural gas flow set value, the target ignition temperature, and the target ignition intensity are protected by limit values, where the limit values are: 8-12; 700-1500m 3/h; 900 ℃ and 1200 ℃; 40-90MJ/m 2.
In the above scheme, the limit value of the air-fuel ratio K1 is protected to ensure reasonable ratio of natural gas and air flow, and to prevent flameout of the sintering machine or waste of natural gas in the adjusting process. And the set value of the natural gas flow, the target ignition temperature and the target ignition intensity are protected by setting limit values, so that the stability of the ignition furnace of the sintering machine in the combustion process is ensured.
while embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (6)
1. An ignition optimization control method of a sintering machine mainly comprises the following steps:
Step 1, manual adjustment, namely, respectively connecting valves for controlling the natural gas flow and the air flow to a PLC/DCS system, and adjusting the natural gas flow and the air flow to initial target values by adopting PID closed-loop control;
step 2, after the initial target value is manually adjusted, adopting a flow follow-up adjusting mode, namely setting the ratio K1 of the natural gas flow and the air flow, and then setting the natural gas flow, wherein the air flow is adjusted in a follow-up manner according to the natural gas flow and the K1 value;
And 3, when the flow follow-up regulation in the step 2 is stable, starting a temperature control mode, namely calculating a new natural gas flow target value according to the deviation between the target temperature and the current temperature, and then adjusting the air flow according to the flow follow-up regulation method in the step 2, wherein the calculation method of the new natural gas flow target value is according to a formula 1:
Formula 1 Gas _ sp ═ K ═ Taim/Tcur ═ Gas _ pv
Wherein Gas _ sp is a new target value of the natural Gas flow; taim is the set target temperature; tcur is the current temperature; gas _ pv is the current value of the natural Gas flow; k is a correction coefficient;
Step 4, after the temperature control mode in the step 3 is stable, starting an ignition intensity control mode again to obtain a current ignition intensity value, judging whether the current ignition intensity value meets a temperature value required to be reached, if so, keeping the current ignition intensity value unchanged, and maintaining the current natural gas and air flow state; if not, entering step 5;
Step 5, providing a new ignition intensity value according to the current ignition intensity value, solving the natural gas flow rate required to be reached, and calculating the air flow rate according to the method in the step 2;
In any one of the flow follow-up adjusting mode, the temperature control mode and the ignition intensity control mode, when the pressure of the natural gas is less than or equal to 2000Pa, the PLC/DCS system starts an alarm system;
And in any mode of the flow follow-up adjusting mode, the temperature control mode and the ignition intensity control mode, when the pressure of the natural gas is less than or equal to 1500Pa, the PLC/DCS system cuts off the ignition system, reduces the air flow to 30% of a normal value, stops the operation of the sintering machine, temporarily stops the operation of conveying end equipment connected with the sintering machine, and gives an alarm prompt, wherein the stop time is set to be 3-6 minutes.
2. The ignition optimization control method of the sintering machine according to claim 1, wherein the PLC/DCS system controls the opening degree of the valve with a current of 4 to 20mA in step 1.
3. the ignition optimization control method of a sintering machine according to claim 1,
In the process of adjusting the natural gas flow to the set natural gas flow in the step 2, the adjustment amount of the single natural gas has amplitude limiting, and the amplitude limiting is as follows: 200m 3/h;
In the process of adjusting the current value of the natural gas flow to the target natural gas flow in the step 3, the adjustment amount of the single natural gas has an amplitude limit, and the amplitude limit is as follows: 200m 3/h.
4. The ignition optimization control method of the sintering machine according to claim 1, wherein the current temperature in step 3 is an average value of temperatures measured by 3 thermocouple inside the sintering machine hearth.
5. the ignition optimization control method of the sintering machine according to claim 1, wherein during the stopping of the operation of the sintering machine and the conveying end equipment connected with the sintering machine, when the machine speed of the sintering machine is less than 0.5m/min, the natural gas flow is at the lower limit value, and the lower limit value is 200m3/h-500m 3/h.
6. the ignition optimization control method of the sintering machine according to claim 1, wherein the K1, the natural gas flow set value, the target ignition temperature and the target ignition intensity are protected by limiting values: 8-12; 700-1500m 3/h; 900 ℃ and 1200 ℃; 40-90MJ/m 2.
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| CN113883910B (en) * | 2021-10-19 | 2023-05-16 | 攀钢集团西昌钢钒有限公司 | Method for controlling regulating valve by control system when throttle flowmeter is in dead zone |
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| JPS54108026A (en) * | 1978-02-10 | 1979-08-24 | Nippon Petroleum Refining Co | Natural draft type heating furnace |
| CN101739004A (en) * | 2009-11-11 | 2010-06-16 | 中冶北方工程技术有限公司 | Fuzzy-PID compound control system for sintering-machine ignition furnaces |
| CN101949645A (en) * | 2010-09-27 | 2011-01-19 | 中南大学 | Multi-dimensional fluid sintering ignition control method reducing gas cost |
| CN202793048U (en) * | 2012-07-10 | 2013-03-13 | 浙江日盛实业有限公司 | Kiln temperature controller |
| 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 |
| CN107560446A (en) * | 2017-09-25 | 2018-01-09 | 佛山市南海鑫隆机工机械有限公司 | A kind of full-automatic control system and its control method of consecutive production kiln |
-
2018
- 2018-04-04 CN CN201810299083.7A patent/CN108507365B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54108026A (en) * | 1978-02-10 | 1979-08-24 | Nippon Petroleum Refining Co | Natural draft type heating furnace |
| CN101739004A (en) * | 2009-11-11 | 2010-06-16 | 中冶北方工程技术有限公司 | Fuzzy-PID compound control system for sintering-machine ignition furnaces |
| CN101949645A (en) * | 2010-09-27 | 2011-01-19 | 中南大学 | Multi-dimensional fluid sintering ignition control method reducing gas cost |
| CN202793048U (en) * | 2012-07-10 | 2013-03-13 | 浙江日盛实业有限公司 | Kiln temperature controller |
| 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 |
| CN107560446A (en) * | 2017-09-25 | 2018-01-09 | 佛山市南海鑫隆机工机械有限公司 | A kind of full-automatic control system and its control method of consecutive production kiln |
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