CN114804667B - Method for controlling material level in hearth of double-hearth lime kiln - Google Patents
Method for controlling material level in hearth of double-hearth lime kiln Download PDFInfo
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- CN114804667B CN114804667B CN202210661596.4A CN202210661596A CN114804667B CN 114804667 B CN114804667 B CN 114804667B CN 202210661596 A CN202210661596 A CN 202210661596A CN 114804667 B CN114804667 B CN 114804667B
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- C—CHEMISTRY; METALLURGY
- 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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- 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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
Abstract
The application provides a method for controlling the material level in a chamber of a double-chamber lime kiln, which is defined as two periods firstly, wherein one period is calcination treatment, and the other period is top feeding, upper heat storage, lower cooling and bottom ash discharging operation of the kiln chamber; then, detecting the material level height in the kiln chamber in real time through a material level meter, then weighing and metering the raw material limestone by using a charging electronic belt scale, weighing and metering the discharged finished product lime by using an ash discharging electronic belt scale, and then increasing or reducing the material level height through matching the charging amount and the ash discharging amount in proportion; a more reasonable feeding system and an ash discharging system are formed, so that the material level height normally fluctuates around a normal value, good precondition is provided for the production of the lime kiln, the high efficiency and stability of preheating, calcining and cooling are ensured, the quality and the yield of finished lime are ensured to be excellent and stable, the production fluctuation of the lime kiln is reduced, and the energy consumption and the pollutant discharge are reduced.
Description
Technical Field
The invention relates to the technical field of lime kilns, in particular to a method for controlling the material level in a hearth of a double-hearth lime kiln.
Background
The lime kiln is used for calcining limestone to decompose the limestone into CaO and CO under high temperature 2 The kiln, limestone and fuel are put into a lime kiln (if gas fuel is sent in through a pipeline and a burner), the decomposition is started when the temperature is heated to 850 ℃, the calcination is finished when the temperature is 1200 ℃, and the limestone and fuel are discharged out of the kiln after being cooled, so that the thermal decomposition reaction is realized. Different kiln shapes have different preheating, calcining, cooling and ash discharging modes.
The calcining process of the double-chamber lime kiln (Meerz lime kiln) comprises the following steps: the double-chamber lime kiln comprises the following components from top to bottom: preheating zone, calcining zone and cooling zone, conveying the qualified stone material into kiln top bunker by means of winch carriage, distributing material into rotary hoppers of two kiln chambers by means of reversible belt of kiln top, uniformly distributing material into kiln by means of rotary distributor, and calcining stone material in kiln by means of positive pressure; supposing that the calcination starts from a kiln chamber A, combustion-supporting air enters from the top of the kiln chamber A and flows downwards under the action of pressure difference, the combustion-supporting air flows downwards in a preheating zone, limestone is preheated and heated up, and when reaching a calcination zone, the combustion-supporting air is mixed with fuel conveyed by a spray gun and combusted to generate high temperature so as to decompose the limestone, the generated lime enters a cooling zone, and the lime is cooled to 60-80 ℃ by cooling air at the bottom of the kiln and then discharged into a lower ash hopper through a disc ash discharging machine; the method comprises the following steps that in the descending process, flue gas generated by combustion-supporting air and fuel enters a kiln chamber B through a connecting channel in the middle of the kiln chamber, the flue gas rises from bottom to top in the kiln chamber B, passes through a calcining zone and then reaches a preheating zone, the flue gas contacts limestone in the preheating zone to exchange heat, waste heat is conducted to the limestone, the temperature of the flue gas is reduced to about 150 ℃, the flue gas is discharged from the top of a kiln, the limestone absorbs the waste heat of the flue gas, the temperature is increased, heat is accumulated, and the combustion-supporting air fed from the top of the kiln in the next period is waited. The double-hearth lime kiln is a parallel-flow heat accumulating type lime shaft kiln, and consists of two hearths connected by a channel positioned at the lower part of a calcining zone, the calcining and heat accumulating functions of the two hearths are interchanged and run alternately, namely one hearth calcines, the other hearth accumulates heat, the other hearth exchanges heat once in 12-15 minutes, and the double-hearth lime kiln is a kiln type with lower heat consumption at present.
At present, the production of the double-chamber lime kiln mainly adopts screw cone ash discharging, disc ash discharging and other modes, and also comprises a nine-hole rotary-center ash discharging machine, an ash discharging supporting plate and the like. The finished product ash discharge of the Maerz double-chamber lime kiln is characterized in that an ash discharge supporting plate is controlled according to a material level meter in a kiln chamber, the material level meter in the kiln chamber is provided with an upper limit value and a lower limit value, and the supporting plate is pushed and pulled in the range to discharge ash back and forth. However, the double-chamber lime kiln adopting the ash discharging supporting plate has the following problems: the ash discharging times are unstable and are neglected, when the material level of the kiln chamber is close to the upper limit value, the supporting plate can quickly discharge ash, the ash discharging times are excessive, when the material level of the kiln chamber is close to the lower limit value, the ash discharging times of the supporting plate can be extremely small, the ash discharging times are uneven, the temperature and the quality of finished lime are directly influenced, and the stability of the kiln condition is indirectly influenced.
Disclosure of Invention
The invention aims to provide a method for controlling the material level in a hearth of a double-hearth lime kiln.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a method for controlling the material level in the chamber of a double-chamber lime kiln comprises the following steps that when one chamber is calcined, the other chamber is subjected to top feeding, upper heat storage, lower cooling and bottom ash discharging;
adding raw material limestone into a kiln chamber from the top of the kiln, and weighing and metering the mass of the raw material limestone by a charging electronic belt scale;
an ash discharging electronic belt scale is arranged below the ash discharging machine at the bottom of each kiln chamber and used for measuring the mass of the discharged finished lime, and the finished lime discharged from the ash discharging machine falls on a belt of the ash discharging electronic belt scale;
respectively monitoring the material level heights of the two kiln chambers through the material level meter, and setting the upper limit value H of the material level heights of the two kiln chambers Upper limit of Both are 1000mm, and normal values H of material level heights in two kiln chambers are set Is normal and normal Are both 900mm, and the lower limit value H of the material level height in the two kiln chambers is set Lower limit of Are all 700mm;
in the same period, when the material level height in the kiln chamber is 1000mm-1150mm, controlling the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale x (1.1-1.2)/1.75;
in the same period, when the material level height in a kiln chamber is more than or equal to 900mm and less than 1000mm, controlling the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale multiplied by (1.05-1.1)/1.75;
in the same period, when the material level height in the kiln chamber is more than or equal to 700mm and less than 900mm, controlling the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale x (0.90-0.95)/1.75;
in the same period, when the material level height in the kiln chamber is more than or equal to 600mm and less than 700mm, controlling the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale x (0.8-0.9)/1.75.
Preferably, the coefficient a = 1-the raw firing rate + the overfire rate;
in the same period, when the material level height in the kiln chamber is 1000mm-1150mm, controlling the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale multiplied by (1.1-1.2) multiplied by A/1.75;
in the same period, when the material level height in a kiln chamber is not less than 900mm and less than 1000mm, controlling the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale multiplied by (1.05-1.1) multiplied by A/1.75;
in the same period, when the material level height in the kiln chamber is more than or equal to 700mm and less than 900mm, controlling the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale multiplied by (0.90-0.95) multiplied by A/1.75;
in the same period, when the material level height in the kiln chamber is more than or equal to 600mm and less than 700mm, controlling the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale multiplied by (0.8-0.9) multiplied by A/1.75.
Preferably, the calcination period of each kiln chamber is 13.5min;
the period of the top feeding, the upper heat storage, the lower cooling and the bottom ash discharging operation is 11.5min-13min.
Preferably, the rapid feeding is controlled, and the feeding speed is 36t/h-45t/h;
and controlling slow ash discharge, wherein the ash discharge speed of the ash discharge electronic belt scale is 25t/h-27t/h.
Preferably, the ash hoist is a supporting plate ash hoist, and the ash discharge capacity of the supporting plate ash hoist is 21t/h-24t/h;
the starting and stopping speed and the ash discharging speed of the support plate ash discharging machine are controlled through the accumulated quality of the ash discharging electronic belt weigher, the support plate ash discharging machine is in discontinuous ash discharging, the ash discharging times in each period of top feeding, upper heat storage, lower cooling and bottom ash discharging operation are 22-25 times, and the ash discharging quality = the accumulated quality/the ash discharging times of the ash discharging electronic belt weigher.
The application provides a method for controlling the material level in the chamber of a double-chamber lime kiln, firstly defining each kiln chamber as two periods, wherein one period is calcination treatment, the other period is the operation of top feeding, upper heat storage, lower cooling and bottom ash discharging of the kiln chamber, and each kiln chamber is continuously and alternately carried out in two periods uninterruptedly;
then through the material level height in the charge level indicator real-time detection kiln thorax, then utilize reinforced electronic belt scale to carry out the weighing measurement to raw materials lime stone, and utilize ash discharge electronic belt scale to carry out the weighing measurement to the finished product lime that unloads, then arrange through the proportion between feeding volume and the ash discharge volume, and then increase or reduce the material level height for the material level height is at material level height normal value H Is normal Normal fluctuations around 900 mm;
specifically, in the same period, when the material level height in the kiln chamber is 1000mm-1150mm, the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale x (1.1-1.2)/1.75 is controlled;
in the same period, when the material level height in the kiln chamber is less than or equal to 900mm and less than 1000mm, controlling the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale x (1.05-1.1)/1.75;
in the same period, when the material level height in the kiln chamber is more than or equal to 700mm and less than 900mm, controlling the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale x (0.90-0.95)/1.75;
in the same period, when the material level height in the kiln chamber is less than or equal to 600mm and less than 700mm, controlling the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale x (0.8-0.9)/1.75;
through the improvement, a more reasonable and more optimized feeding system and an ash discharging system are formed, so that the material level height in each kiln chamber is ensured to be stably kept at and near the normal value of the material level for a long time, the proper and stable material level height provides good precondition for the production of the lime kiln, the proper and stable temperature field in each kiln chamber is ensured, the proper and stable material flow and air flow in each kiln chamber are ensured, the high efficiency and stability of preheating, calcining and cooling are ensured, the quality and the yield of finished lime are ensured to be excellent and stable, the production fluctuation of the lime kiln is reduced, and the energy consumption and pollutant emission are reduced.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The application provides a method for controlling the positions of materials in chambers of a double-chamber lime kiln, wherein when one kiln chamber is calcined, the other kiln chamber is subjected to top feeding, upper heat storage, lower cooling and bottom ash discharging;
adding raw limestone into a kiln chamber from the top of the kiln, and weighing and metering the mass of the raw limestone by a charging electronic belt scale;
an ash discharging electronic belt scale is arranged below the ash discharging machine at the bottom of each kiln chamber and used for measuring the mass of the discharged finished lime, and the finished lime discharged from the ash discharging machine falls on a belt of the ash discharging electronic belt scale;
respectively monitoring the respective material level heights in the two kiln chambers through the material level meters, and setting the upper limit value H of the material level heights in the two kiln chambers Upper limit of Are both 1000mm, and normal values H of the material level heights in the two kiln chambers are set Is normal Are both 900mm, and the lower limit value H of the material level height in the two kiln chambers is set Lower limit of Are all 700mm;
in the same period, when the material level height in the kiln chamber is 1000mm-1150mm, controlling the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale x (1.1-1.2)/1.75;
in the same period, when the material level height in a kiln chamber is more than or equal to 900mm and less than 1000mm, controlling the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale multiplied by (1.05-1.1)/1.75;
in the same period, when the material level height in the kiln chamber is more than or equal to 700mm and less than 900mm, controlling the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale x (0.90-0.95)/1.75;
in the same period, when the material level height in the kiln chamber is more than or equal to 600mm and less than 700mm, controlling the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale x (0.8-0.9)/1.75.
In one embodiment of the present application, the coefficient a = 1-raw firing rate + overfire rate;
in the same period, when the material level height in the kiln chamber is 1000mm-1150mm, controlling the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale multiplied by (1.1-1.2) multiplied by A/1.75;
in the same period, when the material level height in a kiln chamber is not less than 900mm and less than 1000mm, controlling the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale multiplied by (1.05-1.1) multiplied by A/1.75;
in the same period, when the material level height in the kiln chamber is more than or equal to 700mm and less than 900mm, controlling the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale multiplied by (0.90-0.95) multiplied by A/1.75;
in the same period, when the material level height in the kiln chamber is more than or equal to 600mm and less than 700mm, controlling the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale multiplied by (0.8-0.9) multiplied by A/1.75.
In one embodiment of the application, the calcination period of each kiln chamber is 13.5min;
the period of the top feeding, the upper heat storage, the lower cooling and the bottom ash discharging operation is 11.5min-13min.
In one embodiment of the application, the fast feeding is controlled, and the feeding speed is 36t/h-45t/h;
and controlling slow ash discharge, wherein the ash discharge speed of the ash discharge electronic belt scale is 25t/h-27t/h.
In one embodiment of the application, the ash hoist is a supporting plate ash hoist, and the ash hoisting capacity of the supporting plate ash hoist is 21t/h-24t/h;
the starting and stopping speed and the ash discharging speed of the support plate ash discharging machine are controlled through the accumulated quality of the ash discharging electronic belt weigher, the support plate ash discharging machine is in discontinuous ash discharging, the ash discharging times in each period of top feeding, upper heat storage, lower cooling and bottom ash discharging operation are 22-25 times, and the ash discharging quality = the accumulated quality/the ash discharging times of the ash discharging electronic belt weigher.
In the application, the electronic belt scale comprises a scale frame, a speed sensor, a weighing sensor, a control display instrument and the like, and can continuously and dynamically measure solid materials; when materials pass through, the metering carrier roller detects the mass of the materials on the belt and acts on the weighing sensor through a lever to generate a voltage signal which is in direct proportion to the load of the belt; the speed sensor is directly connected to the large-diameter speed measuring roller and provides a series of pulses, each pulse represents a belt moving unit, and the frequency of the pulses is proportional to the speed of the belt; the control display instrument receives signals from the weighing sensor and the speed sensor, and an instantaneous mass value and an accumulated mass value are obtained through integral operation and are respectively displayed.
In the present application, the general criteria for the quality of the finished lime are: calcium oxide content, raw and over-burnt rate, activity, harmful component content and the like; the quality of the quick lime is good, firstly, the content of calcium oxide and magnesium oxide in the quick lime is high, secondly, the raw and overburning rate of the quick lime is required, the raw burning means that partial limestone is not completely decomposed, the overburning means that the limestone is calcined and transited, so that the quick lime is compact, the activity of the overburning quick lime is low, and the over burnt quick lime is difficult to react in the following use; the raw and over-burning rate is usually less than or equal to 5 percent, and the raw and over-burning rate can be respectively detected.
In this application, set coefficient a = 1-raw firing rate + overfire rate, mainly: the green burning rate means that the calcination is not completed, and the green burning material is not taken out of the kiln temporarily; the overburning rate is the transition of limestone calcination, the calcination is completed and the transition is performed, the limestone should be taken out of the kiln as soon as possible and cannot be retained in a kiln chamber any more, and therefore, the overburning rate has a coefficient A generated by the unburning rate and the overburning rate.
In the application, the support plate ash discharger is also called a double-support plate ash discharger, the main body is a pair of symmetrically distributed grid plate trolleys, the transmission device reciprocates along the fixed track to support the finished lime to fall into a bottom hopper of the furnace, and the support plate ash discharger has the advantages of simple structure, reliable operation, light weight and easiness in manufacturing.
Methods and devices not described in detail in the present invention are all the prior art and are not described in detail.
For further understanding of the present invention, the method for controlling the level in the chamber of a dual-chamber lime kiln according to the present invention will be described in detail with reference to the following examples, and the scope of the present invention is not limited by the following examples.
Example 1
The application provides a method for controlling the material level in a chamber of a double-chamber lime kiln, wherein when one chamber is calcined, the other chamber is subjected to top feeding, upper heat storage, lower cooling and bottom ash discharge;
adding raw limestone into a kiln chamber from the top of the kiln, and weighing and metering the mass of the raw limestone by a charging electronic belt scale;
an ash discharging electronic belt scale is arranged below the ash discharging machine at the bottom of each kiln chamber and used for measuring the mass of the discharged finished lime, and the finished lime discharged from the ash discharging machine falls on a belt of the ash discharging electronic belt scale;
respectively monitoring the respective material level heights in the two kiln chambers through the material level meters, and setting the upper limit value H of the material level heights in the two kiln chambers Upper limit of Both are 1000mm, and normal values H of material level heights in two kiln chambers are set Is normal Are both 900mm, and the lower limit value H of the material level height in the two kiln chambers is set Lower limit of Are all 700mm;
in the same period, when the material level height in the kiln chamber is 1130mm, controlling the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale multiplied by 1.15/1.75;
the calcination period of each kiln chamber is 13.5min;
the cycle of the top feeding, the upper heat storage, the lower cooling and the bottom ash discharging operation is 11.5min-13min;
controlling the quick feeding with the feeding speed of 44t/h;
controlling slow ash discharge, wherein the ash discharge speed of the ash discharge electronic belt scale is 25t/h;
the ash discharging machine is a supporting plate ash discharging machine, and the ash discharging capacity of the supporting plate ash discharging machine is 21t/h;
the starting and stopping of the support plate ash hoist and the ash hoisting speed are controlled through the accumulated mass of the ash hoisting electronic belt scale, the support plate ash hoist intermittently hoists ash, the ash hoisting frequency in each period of top feeding, upper heat storage, lower cooling and bottom ash hoisting operation is 22-25 times, and the ash hoisting mass = the accumulated mass/ash hoisting frequency of the ash hoisting electronic belt scale.
Example 2
A method for controlling the material level in the chamber of a double-chamber lime kiln comprises the following steps that when one chamber is calcined, the other chamber is subjected to top feeding, upper heat storage, lower cooling and bottom ash discharging;
adding raw limestone into a kiln chamber from the top of the kiln, and weighing and metering the mass of the raw limestone by a charging electronic belt scale;
an ash discharging electronic belt scale is arranged below the ash discharging machine at the bottom of each kiln chamber and is used for measuring the mass of discharged finished lime, and the finished lime discharged from the ash discharging machine falls on a belt of the ash discharging electronic belt scale;
respectively monitoring the material level heights of the two kiln chambers through the material level meter, and setting the upper limit value H of the material level heights of the two kiln chambers Upper limit of Both are 1000mm, and normal values H of material level heights in two kiln chambers are set Is normal Are both 900mm, and the lower limit value H of the material level height in the two kiln chambers is set Lower limit of Are all 700mm;
in the same period, when the material level height in the kiln chamber is 800mm, controlling the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale multiplied by 0.95/1.75;
the calcination period of each kiln chamber is 13.5min;
the cycle of the top feeding, the upper heat storage, the lower cooling and the bottom ash discharging operation is 11.5min-13min;
controlling the quick feeding with the feeding speed of 44t/h;
controlling slow ash discharge, wherein the ash discharge speed of the ash discharge electronic belt scale is 25t/h;
the ash discharging machine is a supporting plate ash discharging machine, and the ash discharging capacity of the supporting plate ash discharging machine is 21t/h;
the starting and stopping of the support plate ash hoist and the ash hoisting speed are controlled through the accumulated mass of the ash hoisting electronic belt scale, the support plate ash hoist intermittently hoists ash, the ash hoisting frequency in each period of top feeding, upper heat storage, lower cooling and bottom ash hoisting operation is 22-25 times, and the ash hoisting mass = the accumulated mass/ash hoisting frequency of the ash hoisting electronic belt scale.
Example 3
A method for controlling the material level in the chamber of a double-chamber lime kiln comprises the following steps that when one chamber is calcined, the other chamber is subjected to top feeding, upper heat storage, lower cooling and bottom ash discharging;
adding raw limestone into a kiln chamber from the top of the kiln, and weighing and metering the mass of the raw limestone by a charging electronic belt scale;
an ash discharging electronic belt scale is arranged below the ash discharging machine at the bottom of each kiln chamber and is used for measuring the mass of discharged finished lime, and the finished lime discharged from the ash discharging machine falls on a belt of the ash discharging electronic belt scale;
respectively monitoring the material level heights of the two kiln chambers through the material level meter, and setting the upper limit value H of the material level heights of the two kiln chambers Upper limit of Both are 1000mm, and normal values H of material level heights in two kiln chambers are set Is normal Are both 900mm, and the lower limit value H of the material level height in the two kiln chambers is set Lower limit of Are all 700mm;
setting a coefficient A = 1-a raw burning rate + an overfiring rate, wherein the raw burning rate is 1.8% and the overfiring rate is 2.4% through detection, and calculating A =1.006;
in the same period, when the material level height in the kiln chamber is 1130mm, controlling the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale multiplied by 1.15 multiplied by 1.006/1.75;
the calcination period of each kiln chamber is 13.5min;
the cycle of the top feeding, the upper heat storage, the lower cooling and the bottom ash discharging operation is 11.5min-13min;
controlling the quick feeding with the feeding speed of 44t/h;
controlling slow ash discharge, wherein the ash discharge speed of the ash discharge electronic belt scale is 25t/h;
the ash discharging machine is a supporting plate ash discharging machine, and the ash discharging capacity of the supporting plate ash discharging machine is 21t/h;
the starting and stopping of the support plate ash hoist and the ash hoisting speed are controlled through the accumulated mass of the ash hoisting electronic belt scale, the support plate ash hoist intermittently hoists ash, the ash hoisting frequency in each period of top feeding, upper heat storage, lower cooling and bottom ash hoisting operation is 22-25 times, and the ash hoisting mass = the accumulated mass/ash hoisting frequency of the ash hoisting electronic belt scale.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. 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 (3)
1. A method for controlling the material level in the chamber of a double-chamber lime kiln is characterized in that when one chamber is calcined, the other chamber is subjected to top feeding, upper heat storage, lower cooling and bottom ash discharge;
adding raw limestone into a kiln chamber from the top of the kiln, and weighing and metering the mass of the raw limestone by a charging electronic belt scale;
an ash discharging electronic belt scale is arranged below the ash discharging machine at the bottom of each kiln chamber and used for measuring the mass of the discharged finished lime, and the finished lime discharged from the ash discharging machine falls on a belt of the ash discharging electronic belt scale;
respectively monitoring the material level heights of the two kiln chambers through the material level meter, and setting the upper limit value H of the material level heights of the two kiln chambers Upper limit of Both are 1000mm, and normal values H of material level heights in two kiln chambers are set Is normal and normal Are both 900mm, and the lower limit value H of the material level height in the two kiln chambers is set Lower limit of Are all 700mm;
setting a coefficient A = 1-raw burning rate + overfiring rate;
in the same period, when the material level height in the kiln chamber is 1000mm-1150mm, controlling the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale multiplied by (1.1-1.2) multiplied by A/1.75;
in the same period, when the material level height in a kiln chamber is more than or equal to 900mm and less than 1000mm, controlling the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale multiplied by (1.05-1.1) multiplied by A/1.75;
in the same period, when the material level height in the kiln chamber is more than or equal to 700mm and less than 900mm, controlling the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale multiplied by (0.90-0.95) multiplied by A/1.75;
in the same period, when the material level height in the kiln chamber is more than or equal to 600mm and less than 700mm, controlling the accumulated mass of the ash discharging electronic belt scale = the accumulated mass of the charging electronic belt scale multiplied by (0.8-0.9) multiplied by A/1.75;
the ash discharging machine is a supporting plate ash discharging machine, and the ash discharging capacity of the supporting plate ash discharging machine is 21t/h-24t/h;
the starting and stopping of the support plate ash hoist and the ash hoisting speed are controlled through the accumulated mass of the ash hoisting electronic belt scale, the support plate ash hoist intermittently hoists ash, the ash hoisting frequency in each period of top feeding, upper heat storage, lower cooling and bottom ash hoisting operation is 22-25 times, and the ash hoisting mass = the accumulated mass/ash hoisting frequency of the ash hoisting electronic belt scale.
2. The method for controlling the in-chamber material level of the double-chamber lime kiln as claimed in claim 1, wherein the calcination period of each kiln chamber is 13.5min;
the period of the top feeding, the upper heat storage, the lower cooling and the bottom ash discharging operation is 11.5min-13min.
3. The method for controlling the in-bore material level of the double-bore lime kiln as claimed in claim 1, wherein the fast feeding is controlled, the feeding speed is 36t/h-45t/h;
and controlling slow ash discharge, wherein the ash discharge speed of the ash discharge electronic belt scale is 25t/h-27t/h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210661596.4A CN114804667B (en) | 2022-06-13 | 2022-06-13 | Method for controlling material level in hearth of double-hearth lime kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210661596.4A CN114804667B (en) | 2022-06-13 | 2022-06-13 | Method for controlling material level in hearth of double-hearth lime kiln |
Publications (2)
| Publication Number | Publication Date |
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| CN114804667A CN114804667A (en) | 2022-07-29 |
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| CN111807727A (en) * | 2020-09-02 | 2020-10-23 | 山东万方窑炉工程科技有限责任公司 | Double-rectangular-chamber heat-accumulation parallel-flow lime shaft kiln |
| CN113582560A (en) * | 2021-07-10 | 2021-11-02 | 石家庄新华能源环保科技股份有限公司 | Method for calcining limestone by using low-calorific-value fuel in double-hearth kiln |
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| GB417961A (en) * | 1933-05-18 | 1934-10-16 | Waldo Mumford Bailey | Improvements in or relating to boiler furnaces |
| CN201245560Y (en) * | 2008-06-14 | 2009-05-27 | 何志雄 | Cocurrent heat storing type dual-chamber limekiln capable of realizing two-stage calcination |
| CN106673464A (en) * | 2015-11-10 | 2017-05-17 | 哈尔滨市宏天锐达科技有限公司 | Energy-saving and emission-reducing product ash-discharge control method |
| CN105776905B (en) * | 2016-05-19 | 2017-11-24 | 大冶市环宇钙业科技有限公司 | A kind of suction type lime shaft kiln |
| CN111302675B (en) * | 2020-04-27 | 2021-11-09 | 垣曲县五龙镁业有限责任公司 | Method and system for calcining dolomite in heat accumulating type energy-saving double-hearth shaft kiln |
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| CN111807727A (en) * | 2020-09-02 | 2020-10-23 | 山东万方窑炉工程科技有限责任公司 | Double-rectangular-chamber heat-accumulation parallel-flow lime shaft kiln |
| CN113582560A (en) * | 2021-07-10 | 2021-11-02 | 石家庄新华能源环保科技股份有限公司 | Method for calcining limestone by using low-calorific-value fuel in double-hearth kiln |
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