CN111847912A - Double-chamber lime kiln system and control method thereof - Google Patents
Double-chamber lime kiln system and control method thereof Download PDFInfo
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- CN111847912A CN111847912A CN201910340075.7A CN201910340075A CN111847912A CN 111847912 A CN111847912 A CN 111847912A CN 201910340075 A CN201910340075 A CN 201910340075A CN 111847912 A CN111847912 A CN 111847912A
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/12—Preheating, burning calcining or cooling in shaft or vertical furnaces
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Abstract
The application discloses two thorax limekiln systems and control method thereof, according to above-mentioned system and method, utilize measuring device measures certain parameter of flue gas connecting channel, the final degree of confirming the lime stone and calcining, from this, the system and the method that this application provided can ensure two thorax limekiln bodies convert the operating condition of the calcining zone of first limekiln body and second limekiln body in suitable time, finally obtain high-quality quick lime, energy saving simultaneously.
Description
Technical Field
The application relates to the technical field of double-hearth limekilns, in particular to a double-hearth limekiln system and a control method thereof.
Background
The quicklime is an important auxiliary raw material widely applied in the metallurgical industry, and is used as an additive in the processes of sintering ironmaking raw materials, ironmaking reduction, pretreatment of molten iron and external refining, so that the effects of regulating the alkalinity of furnace charge, slagging, desulfurizing and the like are achieved, and the quicklime plays an important role in smoothly carrying out the ironmaking and steelmaking process.
The lime kiln is a core device in the production process of quicklime, and raw material limestone is heated to 1100 ℃ in the lime kiln and calcined to generate the quicklime. The double-chamber lime kiln is a typical vertical lime kiln for producing quicklime, and consists of two symmetrical and side-by-side vertical kiln chambers, wherein the two vertical kiln chambers are respectively a first lime kiln body and a second lime kiln body, and the first lime kiln body and the second lime kiln body are communicated with each other. In the production process, the first lime kiln body and the second lime kiln body alternately calcine and preheat limestone periodically to complete the continuous production of quick lime.
In the related art, the control of the reversing period of the double-hearth lime kiln is mainly determined by the experience of operators, and the mode has too much uncertainty and cannot obtain the proper reversing period. In the production process of the double-hearth lime kiln, the reversing period has important influence on the calcination quality and energy consumption of the quicklime. If the reversing period is too long, the limestone in the combustion chamber exceeds the reasonable calcining time, overburning can be caused, the quality of the quick lime is influenced, and unnecessary energy waste can be caused; if the reversing period is too short, the limestone in the combustion chamber cannot be fully calcined, so that raw combustion is caused, the quick lime contains undecomposed limestone, and the content of effective components of the product is reduced.
Disclosure of Invention
The application aims to provide a double-hearth lime kiln system and a control method thereof, and aims to solve the problem that a reversing period of a double-hearth lime kiln cannot be accurately determined.
In a first aspect, the present application provides a control method of a dual-bore lime kiln system, the control method comprising:
controlling a measuring device to obtain the chamber changing data in the flue gas connecting channel;
judging whether the bore changing data meet a preset bore changing threshold value or not;
and if the bore changing data meet a preset bore changing threshold value, starting a reversing operation, wherein the reversing operation comprises changing the opening state or closing state of the second interface, the third interface, the fourth interface and the fifth interface.
According to the method, the measuring device is used for measuring certain parameters of the flue gas connecting channel, and finally the limestone calcining degree is determined, so that the method provided by the application can ensure that the working state of the calcining zone of the double-hearth lime kiln body on the first lime kiln body and the second lime kiln body is converted in a proper time, and energy is saved while high-quality quick lime is obtained.
With reference to the first aspect, in a first implementable manner of the first aspect, the measurement device includes a temperature measurement device, and the control method includes:
controlling a temperature measuring device to obtain temperature data in the flue gas connecting channel in real time;
calculating a temperature derivative according to the temperature data;
determining whether the temperature derivative is greater than or equal to a temperature derivative threshold;
if the temperature derivative is greater than or equal to a temperature derivative threshold, a commutation operation is initiated.
Therefore, the embodiment of the application utilizes the temperature measuring device to measure the temperature data, and finally determines whether to start the reversing operation by calculating the temperature derivative and comparing the temperature derivative with the temperature derivative threshold value. The method provides accurate starting time of reversing operation, and saves energy while obtaining high-quality limestone in production.
With reference to the first aspect, in a second implementable manner of the first aspect, the measurement device includes a pressure measurement device, and the control method includes:
controlling a pressure measuring device to obtain pressure data in the flue gas connecting channel in real time;
calculating the absolute value of the pressure difference according to the pressure data;
judging whether the absolute value of the pressure difference is smaller than or equal to a pressure difference absolute value threshold value;
and if the absolute value of the pressure difference is smaller than or equal to the absolute value threshold of the pressure difference, starting the reversing operation.
Therefore, the embodiment of the application utilizes the pressure measuring device to measure pressure data, compares the absolute value of the pressure difference value with the threshold value of the absolute value of the pressure difference value through the absolute value of the pressure difference value, and finally determines whether to start the reversing operation. The method provides accurate starting time of reversing operation, and saves energy while obtaining high-quality limestone in production.
With reference to the first aspect, in a third implementable manner of the first aspect, the measurement device includes a temperature measurement device and a pressure measurement device, and the control method includes:
controlling a temperature measuring device to obtain temperature data in the flue gas connecting channel in real time;
Controlling a pressure measuring device to obtain pressure data in the flue gas connecting channel in real time;
calculating a temperature derivative according to the temperature data;
calculating the absolute value of the pressure difference according to the pressure data;
determining whether the temperature derivative is greater than or equal to a temperature derivative threshold and the pressure difference absolute value is less than or equal to a pressure difference absolute value threshold;
if the temperature derivative is greater than or equal to a temperature derivative threshold and the pressure difference absolute value is less than or equal to a pressure difference absolute value threshold, a commutation operation is initiated.
Therefore, the temperature measuring device and the pressure measuring device are utilized to respectively measure the temperature data and the pressure data, and the accuracy of the starting time of the reversing operation can be further improved by using the two measuring devices.
In a fourth implementable manner of the first aspect, with reference to the first or third implementable manner of the first aspect, the method of calculating a temperature derivative comprises:
T′＝(T2-T1)/Δt；
wherein T' is a temperature derivative, T1 is a temperature value at time T1, T2 is a temperature value at time T2, and Δ T is a difference between T2 and T1.
With reference to the second or third possible implementation manner of the first aspect, in a fifth implementation manner of the first aspect, the method for calculating the absolute value of the pressure difference includes:
ΔP＝|P2-P1|；
Where Δ P is the absolute pressure difference, P1 is the pressure value at time t1, and P2 is the pressure value at time t 2.
With reference to the first aspect, in a sixth implementable manner of the first aspect, the reversing operation further includes a limestone charge reversal and a fuel injection reversal.
In a second aspect, the present application provides a dual-chamber limekiln system comprising a dual-chamber limekiln body, a measuring device and a computer control unit;
the double-chamber lime kiln body comprises a flue gas connecting channel; the measuring device is arranged in the smoke connecting channel to measure the chamber changing data in the smoke connecting channel;
the computer control unit is configured to: controlling a measuring device to obtain the chamber changing data in the flue gas connecting channel;
judging whether the bore changing data meet a preset bore changing threshold value or not;
and if the bore changing data meet a preset bore changing threshold value, starting a reversing operation, wherein the reversing operation comprises changing the opening state or closing state of the second interface, the third interface, the fourth interface and the fifth interface.
According to the system, the measuring device is arranged in the flue gas connecting channel, the measuring device can measure the hearth changing data and finally determine the limestone calcining degree, therefore, the system provided by the application can ensure that the working state of the calcining zone of the double-hearth lime kiln body to the first lime kiln body and the second lime kiln body is converted at a proper time, and energy is saved while high-quality quick lime is obtained.
With reference to the first aspect, in a first implementable manner of the first aspect, the measurement device comprises a temperature measurement device and/or a pressure measurement device.
Therefore, the temperature measuring device and/or the pressure measuring device can measure the temperature and/or the pressure in the flue gas connecting channel, and determine the time for completely decomposing the limestone in the first lime kiln body and the second lime kiln body. At which time the operating state of the calcining zone of the first lime kiln body or the calcining zone of the second lime kiln body is switched.
With reference to the first aspect, in a second realizable manner of the first aspect, the measuring end of the measuring device is located at the center of the flue gas connection channel.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a dual-chamber lime kiln system provided by the present application;
FIG. 2 is an enlarged view of the structure of the part A provided by the present application;
FIG. 3 is an enlarged view of the structure of the portion B provided by the present application;
FIG. 4 is a schematic structural diagram of another dual-chamber lime kiln system provided by the present application;
FIG. 5 is a graph showing the temperature and pressure changes of the flue gas connection channel during a calcination period;
FIG. 6 is a schematic structural diagram of yet another dual-chamber lime kiln system provided by the present application;
FIG. 7 is a schematic structural diagram of yet another dual-chamber lime kiln system provided by the present application;
FIG. 8 is a flow chart of a control method of a dual-chamber lime kiln system provided by the present application;
FIG. 9 is a flow chart of another control method for a dual-chamber lime kiln system provided by the present application;
FIG. 10 is a flow chart of a control method of yet another dual-chamber lime kiln system provided by the present application;
FIG. 11 is a flow chart of a control method of a dual-chamber lime kiln system provided by the present application.
The system comprises a 1-double-hearth lime kiln body, a 11-first lime kiln body, a 111-preheating zone, a 112-calcining zone, a 113-cooling zone, a 12-second lime kiln body, a 13-flue gas connecting channel, a 14-first three-way valve, a 141-first interface, a 142-second interface, a 143-third interface, a 15-second three-way valve, a 151-fourth interface, a 152-fifth interface, a 153-sixth interface, a 16-combustion fan, a 17-combustion air pipeline, an 18-smoke exhaust pipeline, a 19-smoke exhaust fan, a 20-cooling air cap, a 21-spray gun, a 22-cooling air pipeline, a 23-cooling fan and a 2-measuring device.
Detailed Description
Referring to fig. 1, fig. 1 is a schematic structural diagram of a dual-chamber lime kiln system provided by the present application.
The double-chamber lime kiln system comprises a double-chamber lime kiln body 1, a measuring device 2 and a computer control unit;
the double-chamber lime kiln body 1 comprises a flue gas connecting channel 13; the measuring device 2 is arranged in the smoke connecting channel 13 to measure the chamber changing data in the smoke connecting channel 13;
the computer control unit is configured to: controlling a measuring device to obtain the chamber changing data in the flue gas connecting channel;
judging whether the bore changing data meet a preset bore changing threshold value or not;
and if the bore changing data meet a preset bore changing threshold value, starting a reversing operation, wherein the reversing operation comprises changing the opening state or closing state of the second interface, the third interface, the fourth interface and the fifth interface.
Specifically, the double-chamber lime kiln can be a MailZi parallel-flow heat accumulating type double-chamber lime kiln.
The double-chamber lime kiln body 1 further comprises a first lime kiln body 11, a second lime kiln body 12, a first three-way valve 14, a second three-way valve 15, a combustion fan 16, a combustion air pipeline 17, a smoke exhaust pipeline 18 and a smoke exhaust fan 19;
The first lime kiln body 11 and the second lime kiln body 12 respectively comprise a preheating zone 111, a calcining zone 112 and a cooling zone 113 which are arranged from top to bottom; the lower part of the calcining zone 112 of the first lime kiln body 11 is connected with the lower part of the calcining zone 112 of the second lime kiln body 12 through the flue gas connecting channel 13, and the measuring device 2 is arranged in the flue gas connecting channel 13 to measure the hearth changing data in the flue gas connecting channel;
in the embodiment of the present application, the quicklime is generated by decomposing limestone after passing through the preheating zone 111, the calcining zone 112 and the cooling zone 113 in the first lime kiln body 11 or the second lime kiln body 12 to complete the preheating, calcining and cooling processes. Specifically, when the limestone is initially placed in the first lime kiln body 11 or the second lime kiln body 12, the limestone is in a low-temperature state (relative to the calcining temperature), the limestone is preliminarily preheated in the preheating zone 111, the preheated limestone is calcined when entering the calcining zone 112 to obtain high-temperature quick lime, and finally the high-temperature quick lime is cooled through the cooling zone 113 to finally obtain a quick lime product.
The double-hearth lime kiln body 1 is used by adjacent lime kiln bodies for generating waste gas during limestone calcination in the production process, and can realize continuous production of quick lime, and the first lime kiln body 11 and the second lime kiln body 12 are alternately converted for use. Referring again to fig. 1, the lower part of the calcining zone 112 of the first lime kiln body 11 and the lower part of the calcining zone 112 of the second lime kiln body 12 are connected by the flue gas connection channel 13, and when limestone is calcined in the first lime kiln body 11, the calcined exhaust gases are conveyed along the flue gas connection channel 13 into the second lime kiln body 12. The calcined exhaust gas is in a high temperature state, and the high temperature exhaust gas can preheat limestone in the second lime kiln body 12. When limestone is calcined in the second lime kiln body 12, exhaust gas generated after calcination is also conveyed along the flue gas connection channel 13 into the first lime kiln body 11, so that the limestone added in the preheating zone 111 of the first lime kiln body 11 can be preheated by the high-temperature exhaust gas.
It is noted that the reversing cycle described in this application is the time during which the calcining zone 112 of the first lime kiln body 11 or the second lime kiln body 12 is operated.
The reversing time is extremely important for calcining the limestone, and if the reversing time is too short, raw burning is easy to generate, and if the reversing time is too long, over burning is easy to generate. This application embodiment sets up measuring device 2 is in the flue gas interface channel 13, measuring device 2 can measure the data of changing the thorax, and the degree that the limestone was calcined is finally confirmed to two thorax limekilns bodies 1 guarantees at the operating condition of the first limekiln body 11 calcining zone of suitable time conversion and the second limekiln body 12 calcining zone 112.
Referring to fig. 2, the first three-way valve 14 includes a first port 141, a second port 142, and a third port 143, and referring to fig. 3, the second three-way valve 15 includes a fourth port 151, a fifth port 152, and a sixth port 153;
the upper end of the first lime kiln body 11 is connected with the first interface 141, the upper end of the second lime kiln body 12 is connected with the fourth interface 151, the second interface 142 and the fifth interface 152 are respectively connected with the combustion-supporting fan 16 through a combustion-supporting air pipeline 17, and the third interface 143 and the sixth interface 153 are respectively connected with the smoke exhaust fan 19 through a smoke exhaust pipeline 18.
Specifically, the first lime kiln body 11 and the second lime kiln body 12 are connected with the same combustion fan 16 and the same smoke exhaust fan 19 in a shared manner. When limestone is calcined in the calcining zone 112 of the first lime kiln body 11, the combustion fan 16 is communicated with the first lime kiln body 11, the smoke exhaust fan 19 is communicated with the second lime kiln body 12, the second port 142 is communicated with the combustion air pipeline 17, the third port 143 is closed with the smoke exhaust pipeline 18, the fifth port 152 is closed with the combustion air pipeline 17, and the sixth port 153 is opened with the smoke exhaust fan 19 through the adjustment of the first three-way valve 14 and the second three-way valve 15; when limestone is calcined in the calcining zone 112 of the second lime kiln body 12, the combustion fan 16 is communicated with the second lime kiln body 12, the smoke exhaust fan 19 is communicated with the first lime kiln body 11, the second port 142 is closed with the combustion air pipeline 17, the third port 143 is communicated with the smoke exhaust pipeline 18, the fifth port 152 is communicated with the combustion air pipeline 17, and the sixth port 153 is closed with the smoke exhaust fan 19 through the adjustment of the first three-way valve 14 and the second three-way valve 15.
According to the above-mentioned system, set up measuring device 2 is in the flue gas interface channel 13, measuring device 2 can measure certain parameter, the degree that the lime stone was calcined is finally confirmed, from this, the system that this application provided can ensure double-chamber lime kiln body 1 is to the operating condition conversion of calcining zone 112 of first lime kiln body 11 and second lime kiln body 12 in suitable time, when obtaining high-quality quick lime, the energy saving.
In some embodiments, the measurement device 2 comprises a temperature measurement device and/or a pressure measurement device.
In particular, referring to fig. 4, the measuring device 2 may comprise a temperature measuring device. FIG. 5 is a graph showing the temperature change of the flue gas connection passage during one calcination period. On the change curve of the temperature of the flue gas connecting channel, an obvious inflection point t2 exists in the limestone calcining process, and before the time t2, the temperature increase speed is slow and is generally less than 5 ℃/min; after time t2, the temperature increase rate sharply increases, which can reach more than 30 ℃/min. This is because, before time t2, the limestone calcination has not been completed, and a large portion of the external heat supply is absorbed by the limestone decomposition process and a small portion is used for the quicklime and limestone temperature rise, so that the tunnel temperature rise is slow. And after t2, the calcined lime is calcined, the limestone in the calcining zone is completely decomposed to generate the calcined lime, and external heat supply is completely used for heating the calcined lime, so that the temperature rising speed of the channel is rapidly increased. Therefore, the time t2 corresponding to the inflection point of the curve of the temperature change of the flue gas connecting channel can be determined as the calcination finishing time when the limestone of the calcining zone is just completely decomposed.
Referring to fig. 6, the measuring device 2 may include a pressure measuring device. Referring again to FIG. 5, for the profile of the flue gas link pressure, as the rate of limestone decomposition increases, the limestone decomposition releases CO2Resulting in an increase in the amount of flue gas in the flue gas connection channel, so that the resistance through the bed increases, the channel pressure gradually increases and reaches a maximum at time t 1. Then the limestone decomposition rate is reduced, the flue gas amount is reduced, and the channel pressure is reduced. After time t2, limestone decomposition is completed, the flue gas amount is not changed, and the channel pressure tends to be stable. From this, it can be determined that the time t2 in the profile of the flue gas connection channel pressure is the calcination end time at which the limestone of the calcining zone is just completely decomposed.
Referring to fig. 7, the measuring device 2 may include a temperature measuring device and a pressure measuring device. The temperature measuring device and the pressure measuring device are used simultaneously, so that the result of the reversing period can be ensured to be more accurate.
Therefore, the temperature measuring device and/or the pressure measuring device can measure the temperature and/or the pressure in the flue gas connecting channel, and determine the time for completely decomposing the limestone in the first lime kiln body and the second lime kiln body. At which time the operating state of the calcining zone of the first lime kiln body or the calcining zone of the second lime kiln body is switched.
In some embodiments, the double-chamber lime kiln body 1 further comprises a cooling air cap 20, a spray gun 21, a cooling air pipeline 22 and a cooling fan 23;
the lower ends of the first lime kiln body 11 and the second lime kiln body 12 are both provided with cooling air caps 20, and the cooling air caps 20 are connected with the cooling fan 23 through cooling air pipelines 22;
and spray guns 21 are arranged on the lower parts of the preheating zones of the first lime kiln body 11 and the second lime kiln body 12 and used for spraying fuel.
The fuel is alternately fed from the upper parts of the first lime kiln body 11 and the second lime kiln body 12, and is uniformly distributed over the entire cross section of the limestone by means of the plurality of lances 21 provided at the bottom of the preheating zone 111, so that the raw material limestone is uniformly calcined. The double-chamber lime kiln uses fluid fuel, such as coal gas, oil, coal powder and the like. When the calcining zone of the first lime kiln body 11 is in a working state and the calcining zone of the second lime kiln body 12 is in a non-working state, combustion air is fed from the upper part of the first lime kiln body 11 through a combustion air pipeline 17 by a combustion fan 16, the combustion air is preheated by limestone in the preheating zone 111 before being mixed with fuel, and then the calcining flame airflow flows through the calcining zone 112 and flows in parallel with the limestone to calcine the limestone. The waste gas obtained after calcination is discharged to the top along the preheating zone 111 of the second lime kiln body 12 through the flue gas connecting channel 13 connecting the first lime kiln body 11 and the second lime kiln body 12, and the limestone newly added into the second lime kiln body 12 is preheated in the discharging process so as to fully recover the heat of the flue gas. Finally, the exhaust gas is discharged from the exhaust fan 19 through the exhaust duct 18. And a cooling fan 23 for cooling air is introduced into the bottoms of the first lime kiln body 11 and the second lime kiln body 12 from a cooling air cap 20 through a cooling air pipeline 22 to perform countercurrent heat exchange cooling on the calcined high-temperature quick lime, and the cooling air after heat exchange is combined with the calcined waste gas and then discharged to the top along a preheating zone 111 of the second lime kiln body 12 through a flue gas connecting channel 13.
Therefore, the cooling fan provides cooling air for the first lime kiln body and the second lime kiln body, and the cooling air is used for cooling calcined quick lime. The spray gun provides fuel for the limestone and ensures that the limestone is uniformly calcined.
In some embodiments, the measuring end of the measuring device 2 is located in the center of the flue gas connection channel 13.
Referring to fig. 8, fig. 8 is a flow chart illustrating a control method of a dual-chamber lime kiln system. The embodiment of the application provides a control method of a double-hearth lime kiln system, which comprises the following steps:
s100, controlling a measuring device to obtain chamber changing data in a smoke connecting channel;
s200, judging whether the bore changing data meet a preset bore changing threshold value or not;
and step S300, if the bore changing data meet a preset bore changing threshold value, starting a reversing operation, wherein the reversing operation comprises changing the opening state or closing state of the second interface, the third interface, the fourth interface and the fifth interface.
Specifically, because the switching-over cycle is very important for the lime stone calcination, so this application embodiment utilizes measuring device to obtain and trades the thorax data, through trading the thorax data, confirms whether need start the switching-over operation, the switching-over operation is about to the operating condition conversion of the calcining zone of first lime kiln body and second lime kiln body, and simultaneously, the effect position of smoke exhaust fan and combustion-supporting fan also changes, for example, when the calcining zone of first lime kiln body converts from operating condition to non-operating condition, the calcining zone of second lime kiln body converts from non-operating condition to operating condition, and at this moment, smoke exhaust fan converts the exhaust gas of extracting in the second lime kiln body into and extracts the waste gas in the first lime kiln body, and combustion-supporting fan converts from providing combustion-supporting air for first lime kiln body into providing combustion-supporting air for the second lime kiln body. In the embodiment of the application, the action positions of the smoke exhaust fan and the combustion fan are switched by opening or closing the second interface, the third interface, the fourth interface and the fifth interface.
According to the method, the measuring device is used for measuring certain parameters of the flue gas connecting channel, and finally the limestone calcining degree is determined, so that the method provided by the application can ensure that the working state of the calcining zone of the double-hearth lime kiln body on the first lime kiln body and the second lime kiln body is converted in a proper time, and energy is saved while high-quality quick lime is obtained.
In some embodiments, the measuring device includes a temperature measuring device, as shown in fig. 9, and the control method includes:
s101, controlling a temperature measuring device to obtain temperature data in a flue gas connecting channel in real time;
step S102, calculating a temperature derivative according to the temperature data;
step S103, judging whether the temperature derivative is larger than or equal to a temperature derivative threshold value or not; and step S104, if the temperature derivative is larger than or equal to the temperature derivative threshold value, starting the reversing operation.
Specifically, referring again to fig. 5, on the variation curve of the flue gas connection channel temperature, there is an obvious inflection point t2 in the limestone calcination process, and before time t2, the temperature increase rate is slow, generally less than 5 ℃/min; after time t2, the temperature increase rate sharply increases, which can reach more than 30 ℃/min. This is because, before time t2, the limestone calcination has not been completed, and a large portion of the external heat supply is absorbed by the limestone decomposition process and a small portion is used for the quicklime and limestone temperature rise, so that the tunnel temperature rise is slow. And after t2, the calcined lime is calcined, the limestone in the calcining zone is completely decomposed to generate the calcined lime, and external heat supply is completely used for heating the calcined lime, so that the temperature rising speed of the channel is rapidly increased. Therefore, the time t2 corresponding to the inflection point of the curve of the temperature change of the flue gas connecting channel can be determined as the calcination finishing time when the limestone of the calcining zone is just completely decomposed.
When the temperature derivative has a step change, namely the temperature derivative is greater than or equal to the temperature derivative threshold value, the limestone is completely decomposed into quicklime, and the reversing operation is started.
Therefore, the embodiment of the application utilizes the temperature measuring device to measure the temperature data, and finally determines whether to start the reversing operation by calculating the temperature derivative and comparing the temperature derivative with the temperature derivative threshold value. The method provides accurate starting time of reversing operation, and saves energy while obtaining high-quality limestone in production.
In some embodiments, the measuring device comprises a pressure measuring device, as shown in fig. 10, and the control method comprises:
step S201, controlling a pressure measuring device to obtain pressure data in a flue gas connecting channel in real time;
step S202, calculating an absolute value of a pressure difference value according to the pressure data;
step S203, judging whether the absolute value of the pressure difference is smaller than or equal to a pressure difference absolute value threshold value;
and step S204, if the absolute value of the pressure difference is smaller than or equal to the absolute value threshold of the pressure difference, starting the reversing operation.
Referring again to FIG. 5, for the profile of the flue gas link pressure, as the rate of limestone decomposition increases, the limestone decomposition releases CO 2Resulting in an increase in the amount of flue gas in the flue gas connection channel, so that the resistance through the bed increases, the channel pressure gradually increases and reaches a maximum at time t 1. Then the limestone decomposition rate is reduced, the flue gas amount is reduced, and the channel pressure is reduced. After time t2, limestone decomposition is completed, the flue gas amount is not changed, and the channel pressure tends to be stable. From this, it can be determined that the time t2 in the profile of the flue gas connection channel pressure is the calcination end time at which the limestone of the calcining zone is just completely decomposed.
Specifically, when the pressure tends to be stable, that is, the absolute value of the pressure difference is less than or equal to the threshold value of the absolute value of the pressure difference, it is indicated that the limestone is completely decomposed into quicklime, and at this time, the reversing operation is started.
Therefore, the embodiment of the application utilizes the pressure measuring device to measure pressure data, compares the absolute value of the pressure difference value with the threshold value of the absolute value of the pressure difference value through the absolute value of the pressure difference value, and finally determines whether to start the reversing operation. The method provides accurate starting time of reversing operation, and saves energy while obtaining high-quality limestone in production.
In some embodiments, the measuring means includes a temperature measuring means and a pressure measuring means, as shown in fig. 11, the control method includes:
S301, controlling a temperature measuring device to obtain temperature data in a flue gas connecting channel in real time;
controlling a pressure measuring device to obtain pressure data in the flue gas connecting channel in real time;
calculating a temperature derivative according to the temperature data;
calculating the absolute value of the pressure difference according to the pressure data;
step S302, judging whether the temperature derivative is larger than or equal to a temperature derivative threshold value or not, and whether the pressure difference absolute value is smaller than or equal to a pressure difference absolute value threshold value or not; step S303, if the temperature derivative is greater than or equal to the temperature derivative threshold and the pressure difference absolute value is less than or equal to the pressure difference absolute value threshold, starting the reversing operation.
Specifically, when the temperature derivative has a step change and the pressure tends to be stable, the limestone is completely decomposed into quicklime, and the reversing operation is started. If the temperature derivative does not have step change or the pressure does not tend to be stable, the temperature data and the pressure data are continuously measured by the temperature measuring device and the pressure measuring device respectively until the temperature derivative is larger than or equal to a temperature derivative threshold value and the pressure difference absolute value is smaller than or equal to a pressure difference absolute value threshold value, and the reversing operation is started.
Therefore, the temperature measuring device and the pressure measuring device are utilized to respectively measure the temperature data and the pressure data, and the accuracy of the starting time of the reversing operation can be further improved by using the two measuring devices.
In some embodiments, the method of calculating a temperature derivative comprises:
T′＝(T2-T1)/Δt；
wherein T' is a temperature derivative, T1 is a temperature value at time T1, T2 is a temperature value at time T2, Δ T is a difference between T2 and T1, and T1 is a time immediately before T2.
In some embodiments, the method of calculating an absolute value of a pressure difference comprises:
ΔP＝|P2-P1|；
where Δ P is the absolute pressure difference, P1 is the pressure value at time t1, P2 is the pressure value at time t2, and t1 is the time immediately before t 2.
In some embodiments, the reversing operation further comprises a limestone feed reversal and a fuel injection reversal.
Specifically, during the operation of the double-hearth lime kiln body, the first lime kiln body and the second lime kiln body are filled with limestone in a preheating zone, a calcining zone and a cooling zone, after the first lime kiln body finishes calcining the limestone, part of the quicklime is output from the bottom of the first lime kiln body, the limestone which is originally in the preheating zone is transferred to the calcining zone, meanwhile, the limestone is added to the top of the first lime kiln body, and the material level height in the original first lime kiln body is maintained. When the limestone is in the calcining zone and is calcined, the limestone is converted into limestone for the second lime kiln body to be calcined, after the limestone is calcined by the second lime kiln body, part of quick lime is output from the bottom of the second lime kiln body, and meanwhile, the limestone is added into the top of the second lime kiln body. And the limestone is loaded and reversed, namely the spray gun jet fuel of the first lime kiln body is converted into the spray gun jet fuel of the second lime kiln body.
The same and similar parts in the various embodiments in this specification may be referred to each other.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. A control method of a dual-chamber lime kiln system, characterized in that the control method comprises:
controlling a measuring device to obtain the chamber changing data in the flue gas connecting channel;
judging whether the bore changing data meet a preset bore changing threshold value or not;
and if the bore changing data meet a preset bore changing threshold value, starting a reversing operation, wherein the reversing operation comprises changing the opening state or closing state of the second interface, the third interface, the fourth interface and the fifth interface.
2. The control method of a dual-bore lime kiln system according to claim 1, wherein the measuring device includes a temperature measuring device, the control method comprising:
controlling a temperature measuring device to obtain temperature data in the flue gas connecting channel in real time;
calculating a temperature derivative according to the temperature data;
determining whether the temperature derivative is greater than or equal to a temperature derivative threshold;
if the temperature derivative is greater than or equal to a temperature derivative threshold, a commutation operation is initiated.
3. The control method of a dual-bore lime kiln system according to claim 1, wherein the measuring device includes a pressure measuring device, the control method comprising:
controlling a pressure measuring device to obtain pressure data in the flue gas connecting channel in real time;
calculating the absolute value of the pressure difference according to the pressure data;
judging whether the absolute value of the pressure difference is smaller than or equal to a pressure difference absolute value threshold value;
and if the absolute value of the pressure difference is smaller than or equal to the absolute value threshold of the pressure difference, starting the reversing operation.
4. The control method of a dual-bore lime kiln system according to claim 1, wherein the measuring device includes a temperature measuring device and a pressure measuring device, the control method comprising:
Controlling a temperature measuring device to obtain temperature data in the flue gas connecting channel in real time;
controlling a pressure measuring device to obtain pressure data in the flue gas connecting channel in real time;
calculating a temperature derivative according to the temperature data;
calculating the absolute value of the pressure difference according to the pressure data;
determining whether the temperature derivative is greater than or equal to a temperature derivative threshold and the pressure difference absolute value is less than or equal to a pressure difference absolute value threshold;
if the temperature derivative is greater than or equal to a temperature derivative threshold and the pressure difference absolute value is less than or equal to a pressure difference absolute value threshold, a commutation operation is initiated.
5. The control method of the dual-bore lime kiln system according to claim 2 or 4, wherein the method of calculating the temperature derivative includes:
T′＝(T2-T1)/Δt；
wherein T' is a temperature derivative, T1 is a temperature value at time T1, T2 is a temperature value at time T2, and Δ T is a difference between T2 and T1.
6. The control method of the dual-bore lime kiln system according to claim 3 or 4, wherein the method of calculating the absolute value of the pressure difference includes:
ΔP＝|P2-P1|；
where Δ P is the absolute pressure difference, P1 is the pressure value at time t1, and P2 is the pressure value at time t 2.
7. The control method of the dual-bore lime kiln system according to claim 1, wherein the reversing operation further includes a charging reversal of limestone and a jetting reversal of fuel.
8. A double-chamber lime kiln system is characterized by comprising a double-chamber lime kiln body, a measuring device and a computer control unit;
the double-chamber lime kiln body comprises a flue gas connecting channel; the measuring device is arranged in the smoke connecting channel to measure the chamber changing data in the smoke connecting channel;
the computer control unit is configured to: controlling a measuring device to obtain the chamber changing data in the flue gas connecting channel;
judging whether the bore changing data meet a preset bore changing threshold value or not;
and if the bore changing data meet a preset bore changing threshold value, starting a reversing operation, wherein the reversing operation comprises changing the opening state or closing state of the second interface, the third interface, the fourth interface and the fifth interface.
9. The system of claim 8, wherein the measurement device comprises a temperature measurement device and/or a pressure measurement device.
10. The system of claim 8, wherein the measuring end of the measuring device is located in the center of the flue gas connection channel.
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| CN201910340075.7A CN111847912A (en) | 2019-04-25 | 2019-04-25 | Double-chamber lime kiln system and control method thereof |
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| CN201910340075.7A CN111847912A (en) | 2019-04-25 | 2019-04-25 | Double-chamber lime kiln system and control method thereof |
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