CN111322879A - Method for quickly igniting and baking furnace in Maerz kiln - Google Patents
Method for quickly igniting and baking furnace in Maerz kiln Download PDFInfo
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- CN111322879A CN111322879A CN202010266018.1A CN202010266018A CN111322879A CN 111322879 A CN111322879 A CN 111322879A CN 202010266018 A CN202010266018 A CN 202010266018A CN 111322879 A CN111322879 A CN 111322879A
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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
- F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
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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—Arrangements of monitoring devices; Arrangements 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
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D21/0014—Devices for monitoring temperature
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Abstract
The invention discloses a method for quickly igniting and baking a furnace by a Maerz kiln, which comprises the steps of adding stone into the kiln after a kiln tightness crushing test is qualified, then adding a mixture of the stone and coke, and adding the stone to a covering spray gun box; setting the kiln to be in an ignition mode, starting a combustion fan, igniting an ignition burner, starting a kiln cooling fan, and baking the kiln; the heat of combustion of the ignition burner is sent into a kiln chamber B to preheat stone and coke; after the kiln is reversed, the heat burnt by the ignition burner is sent into the kiln chamber A to preheat stone and coke; the above steps are alternately circulated, when the temperature of the mixture below the spray gun reaches above 700 ℃, the kiln is stopped, the ignition burner is removed, and the optical pyrometer is installed; and (3) feeding coal gas to the spray gun for ignition, igniting the spray gun, and operating the kiln for 36 hours to obtain a qualified finished product. Compared with the prior art, the invention realizes quick ignition and baking of the furnace, and the time from ignition of the cold kiln to qualified finished product production is 3-4 days, thereby greatly improving the production efficiency.
Description
Technical Field
The invention relates to the technical field of metallurgical production, in particular to a method for quickly igniting and baking a furnace by a malz kiln.
Background
The baking furnace of the Mailz furnace is a necessary process for realizing the switching from a cooling furnace to a heating furnace of the furnace from the operation debugging of equipment to the normal production operation, so that the heat is gradually accumulated in the furnace, and the air temperature required by the baking furnace and the blowing-in of the blast furnace is ensured. The Maerz kiln is provided with two kiln chambers, the two kiln chambers alternately calcine and preheat ores, a connecting channel is arranged between the two kiln chambers and communicated with each other, and the two kiln chambers are reversed once after set time, so that the working states of the two kiln chambers are changed. The maltz kiln shown in fig. 1 comprises a kiln chamber a and a kiln chamber B, wherein the kiln chamber a and the kiln chamber B are communicated with each other through a middle channel 1, a fire door 3, a middle channel thermocouple 2 and an ignition burner 12 are arranged at the upper part of the middle channel 1, and a flame detector is arranged at the upper end of the ignition burner 12; spray guns 5 are distributed on the upper parts of the kiln chamber A and the kiln chamber B, the spray guns 5 are arranged on the furnace wall 20 through spray gun boxes 6, and spray gun end thermocouples 4 are arranged in the spray guns 5; the combustion-supporting air reversing valves 7 are respectively arranged at the tops close to the kiln chamber A and the kiln chamber B, the combustion-supporting air reversing valves 7 are connected with a waste gas exhaust pipe 8, the two combustion-supporting air reversing valves 7 are sequentially connected with a combustion-supporting air adjusting valve 19, a combustion-supporting air release valve 18 and a combustion-supporting fan 16 through combustion-supporting air pipes 17, an ignition burner 12 is connected between the combustion-supporting air adjusting valve 19 and the combustion-supporting air release valve 18 through a combustion-supporting air pipe 17, and a combustion-supporting air stop valve 10 is arranged; the lower parts of the kiln chamber A and the kiln chamber B are sequentially connected with a cooling air release valve 13 and a kiln cooling fan 15 through a kiln cooling air pipe 14; as shown in fig. 3, 4 and 5, the ignition burner 12 is connected with a first gas stop valve 9, two first gas quick-cutting valves 30 and a gas pressurizer 29 in sequence through a gas pipeline 11, and a return valve 33 and a bypass valve 32 are connected with the gas pressurizer 29 in parallel; the outer sides of the kiln chamber A and the kiln chamber B are respectively provided with a gas ring pipe 21 connected with the spray gun 5, and a second gas stop valve 22 is arranged between the gas ring pipe 21 and the spray gun 5; the gas ring pipe 21 is connected between the first gas stop valve 9 and the first gas quick-cutting valve 30 through a gas pipeline 11 and two second gas quick-cutting valves 31; and a spray gun cooling air ring pipe 25 connected with the spray guns 5 is arranged above the gas ring pipe 21, a spray gun stop valve 24 and a spray gun check valve 23 are sequentially arranged between the spray gun cooling air ring pipe 25 and the spray guns 5, and the two spray gun cooling air ring pipes 25 are connected with a spray gun cooling fan 28 through a spray gun cooling air pipe 27 and a spray gun cooling air reversing valve 26.
The existing method for baking the furnace by igniting the Maerz kiln comprises the following steps:
⑴, filling the Maerz kiln with stones, and setting the Maerz kiln to automatically run in an ignition mode;
⑵, manually using an ignited acetylene long gun as a pilot source, holding the acetylene long gun to extend into the kiln from the position of a fire door 3 of the middle channel 1, and placing the pilot source below the ignition burner 12;
⑶, starting a combustion-supporting fan 16, and under the action of a combustion-supporting air adjusting valve 19, conveying a part of combustion-supporting air to an ignition burner 12 through a combustion-supporting air stop valve 10 for burning of the ignition burner 12, conveying a part of combustion-supporting air to the kiln chamber A through a combustion-supporting air reversing valve 7 on the kiln chamber A, and conveying flue gas heat burnt by the ignition burner 12 of the middle channel 1 to the kiln chamber B to preheat stones in the kiln chamber B;
⑷, opening the gas stop valve 9 on the gas pipeline 11, feeding gas to the ignition burner 12, igniting the ignition burner 12, taking out the acetylene long gun, and sealing the poking door 3;
⑸, under the condition that the flame of the middle channel 1 is stable, the kiln cooling fan 15 is started, the cooling air and the combustion-supporting air send the heat of the flue gas combusted by the ignition burner 12 into the kiln chamber B, and the stone in the kiln chamber B is preheated;
⑹, opening a flame detector at the upper end of the ignition burner 12 to monitor the flame condition and carry out interlocking protection, when no flame is detected, automatically closing the first gas quick-cutting valve 30 by the system, stopping conveying gas to the ignition burner 12 and ensuring the safe operation of the system;
⑺, after running for 1 hour, after a kiln reversing period of 40-90 seconds, switching the working states of the kiln chamber A and the kiln chamber B, at the moment, conveying combustion-supporting air into the kiln chamber B through a combustion-supporting air reversing valve 7 on the kiln chamber B, and conveying the heat of combustion of the ignition burner 12 into the kiln chamber A by the combustion-supporting air and cooling air to preheat stones in the kiln chamber A;
⑻, controlling the temperature of the whole oven process according to the oven curve, gradually increasing the gas quantity conveyed to the ignition burner 12 along with the lapse of the oven time, increasing the heat quantity of the flue gas burnt by the ignition burner 12 and gradually increasing the conveyed heat quantity;
⑼, the whole ignition and oven drying time needs 5-7 days, when the temperature of the thermocouple 4 at the end of the spray gun is raised to be over 700 ℃, stone below the head of the spray gun 5 of the kiln is preheated to form an ignition source, and the condition that coal gas is fed into the spray gun 5 for ignition is met, the ignition burner 12 is immediately dismantled, an optical pyrometer is installed at the installation position of the ignition burner 12, then the kiln is switched to a production mode, the production mode is switched to a normal production mode that coal gas is fed by the spray gun 5 for calcination, and after 36 hours, finished qualified materials are obtained.
By adopting the method for igniting and baking the furnace in the Maerz kiln, the ignition and baking time is long, and 9-10 days are needed from ignition to finished qualified material discharge. Therefore, the ignition furnace drying method needs to be improved, the furnace drying time is shortened, the kiln is enabled to be switched to normal production as soon as possible, and the production efficiency is improved.
Disclosure of Invention
The invention aims to solve the problem of providing a method for quickly igniting and baking a Maerz kiln, which aims to solve the problems of longer time and low production efficiency of the conventional Maerz kiln.
In order to solve the problems, the invention adopts the technical scheme that: the method for quickly igniting and baking the furnace by the aid of the Maerz kiln comprises the following steps:
a. the kiln is qualified by a tightness pressure test before opening the kiln and drying the furnace;
b. adding dry stone into the kiln to a position 0.5-1.0 m lower than the lower end of the head of the spray gun, wherein particles with the particle size of 40-80 mm in the stone account for more than 80% of the weight of the stone;
c. preparing a mixture from dried stone and coke according to a weight ratio of 5: 1-5: 3, wherein particles with a particle size of 10-40 mm in the coke account for more than 80% of the weight of the coke; then adding the obtained mixture into a kiln, adding the mixture to a position 3.0-3.5 m higher than the lower end of the head of the spray gun, and adding dry stone to a position completely covering the spray gun box;
d. setting the kiln ignition and drying capacity to be 5-30 tons/day, and setting the conversion coefficient of the limestone raw material quality conversion finished product to be 0.55-0.60; the mode of feeding during the reversing is adopted, the feeding amount per period is 700 kg-2200 kg, the cycle number per day is 24-36 periods, and the reversing period is set to be 40 seconds-90 seconds; the kiln is set to operate in an ignition mode, a combustion-supporting air adjusting valve is set to have an opening degree of 15-45 degrees, a combustion-supporting fan is started to feed combustion-supporting air to an ignition burner, and a ignited acetylene long gun extends into a middle channel from a fire shifting door to enable acetylene flame to be positioned below the ignition burner; starting a gas pressurizer to feed gas into the ignition burner, igniting the gas by acetylene flame, and immediately closing the fire door; after the combustion flame of the ignition burner is stable, starting a cooling fan of the kiln, and baking the kiln;
e. in the process of baking the furnace, according to the requirements of a baking furnace curve, the temperature rise speed of the thermocouple of the middle channel is controlled by adjusting the flow rate of combustion-supporting air and the supply amount of coal gas, the temperature rise of the thermocouple 2 of the middle channel is controlled not to exceed 20 ℃ per hour, so that the temperature rises uniformly, wherein the temperature deviation of the thermocouple of the middle channel is +/-50 ℃; combustion-supporting air is conveyed into the kiln chamber A through a combustion-supporting air reversing valve on the kiln chamber A, the combustion-supporting air and cooling air convey the heat of flue gas combusted by the intermediate channel ignition burner into the kiln chamber B together, stone and coke in the kiln chamber B are preheated, at the moment, the kiln chamber A is a combustion chamber, and the kiln chamber B is a heat storage chamber; switching the working states of the kiln chamber A and the kiln chamber B after a reversing period of 40-90 seconds, conveying combustion-supporting air into the kiln chamber B through a combustion-supporting air reversing valve on the kiln chamber B, conveying the heat of flue gas combusted by an ignition burner into the kiln chamber A together with the combustion-supporting air and cooling air, and preheating stones and coke in the kiln chamber A, wherein the kiln chamber A is a heat storage chamber and the kiln chamber B is a combustion chamber;
f. after the coke below the head of the spray gun is ignited, when the temperature below the head of the spray gun of the kiln chamber A and the kiln chamber B reaches above 700 ℃, the coal gas is conveyed to the spray gun for ignition, and the normal production condition is changed; immediately arranging kiln shutdown, closing the first gas stop valve and the combustion-supporting air stop valve, removing the ignition burner and installing an optical pyrometer;
g. the kiln capacity setting is changed into 380-450 tons/day, the conversion coefficient of the limestone raw material quality conversion finished product is set to be 0.55-0.60, the feeding amount per period is 6000-7400 kg, and the calcination period per day is set to be 90-100 periods; setting the coefficient of the surplus air to be 1.0-1.10 and the coefficient of the cooling air to be 0.7-1.0; the kiln is set to operate in a production mode, all second coal gas stop valves and all spray gun stop valves which are communicated with the spray guns on the kiln chamber A and the kiln chamber B are opened, and the combustion-supporting air adjusting valve is completely opened; closing a combustion-supporting air stop valve, confirming that a bypass valve is completely closed, then starting a gas pressurizer, opening a first gas quick-cutting valve and a second gas quick-cutting valve connected with a combustion chamber, closing a reflux valve, feeding gas to all spray guns on the combustion chamber, and ensuring that all spray guns in the combustion chamber are ignited under the condition that coke is used as an ignition source;
h. the kiln is operated for 12-15 minutes, and after a kiln reversing period of 40-90 seconds, the combustion chamber and the heat storage chamber are switched, and a new cycle of periodic combustion is started; the alternate and cyclic production is carried out, and the finished qualified material can be obtained after the continuous production in the kiln for 36 hours.
In the above technical solution of the method for rapid ignition and baking of the malz kiln, a more specific technical solution may also be: when gas is fed into the spray gun, attention is paid to observe a temperature curve graph of the optical pyrometer, when the temperature displayed by the optical pyrometer is continuously reduced within 3 minutes after the system starts to feed the gas into the spray gun, the gas is cut off after the spray gun is not ignited, the ignition burner is reinstalled, and the furnace is ignited and dried again through the ignition burner.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, dry stone is adopted, and a mixture prepared from the stone and coke according to a certain weight ratio covers the head of the spray gun, so that favorable conditions are created for the ignition of the spray gun; the particle size of coke and lime is controlled, the kiln ignition baking oven capacity is reasonably set, the air permeability of stone materials is guaranteed, flue gas heat generated by combustion of an ignition nozzle of a middle channel is sent into a heat storage chamber by utilizing combustion-supporting air and cooling air, coke around a spray gun in the heat storage chamber is preheated, and the coke becomes an ignition source, the ignition baking oven time can be effectively shortened, the quick ignition baking oven is realized, the time from ignition of a cold kiln to discharge of finished qualified materials is shortened to 3-4 days, the kiln is enabled to be shifted to normal production as soon as possible, and the production efficiency is improved.
2. And when the temperature displayed by the optical pyrometer is continuously reduced within 3 minutes after the system starts to send the gas to the spray gun, the gas is cut off, the ignition burner is installed again, and the furnace is ignited and dried through the ignition burner again, so that the normal operation of the furnace drying process is ensured.
Drawings
FIG. 1 is a schematic view of gas flow when a kiln chamber A is a combustion chamber and a kiln chamber B is a heat storage chamber in the baking process of the Maerz kiln.
FIG. 2 is a schematic view of a hearth A of the Maerz kiln as a heat storage chamber and a hearth B of the Maerz kiln as a combustion chamber in the baking process of the Maerz kiln according to the embodiment of the invention.
FIG. 3 is a schematic view showing the connection of the ignition burner of the Maerz kiln with the gas pipeline and the combustion-supporting air duct.
FIG. 4 is a schematic view of the connection of the lance of the Maerz kiln to the gas line and the lance cooling air duct.
FIG. 5 is a schematic view of a gas pressurization system and a lance cooling system of the Maerz kiln.
FIG. 6 is a diagram showing the thermocouple temperature control of the intermediate channel during the baking process of the Maerz kiln according to the embodiment of the present invention.
Detailed Description
The invention will be further described in detail with reference to the following examples:
example 1
A method for rapid ignition baking of a malz kiln, the construction of which is shown in fig. 1, 3, 4, 5, comprising the steps of:
a. the kiln is qualified by a tightness pressure test before opening the kiln and drying the furnace;
b. adding dry stone into the kiln to a position 0.5m lower than the lower end of the head of the spray gun 5 through a single-hopper and other feeding systems, wherein particles with the particle size of 40-80 mm in the stone account for more than 80% of the weight of the stone;
c. preparing a mixture from dried stone and coke according to a weight ratio of 5:1, wherein particles with the particle size of 10-40 mm in the coke account for more than 80% of the weight of the coke; then adding the obtained mixture into the kiln through a single-hopper feeding system, adding the mixture to a position 3.0m higher than the lower end of the head of the spray gun 5 to enable the mixture to completely cover the head of the spray gun, and adding dry stone to a position completely covering the spray gun box 6, wherein the position C in the figure 1 is a stone layer surface, and the stone is limestone raw material;
d. the capacity of the kiln ignition drying furnace is set to be 5 tons/day, the conversion coefficient of the finished product of the limestone raw material quality conversion is set to be 0.55, and the conversion coefficient is the mass number of the finished product of lime converted after each 1kg of limestone raw material is calcined. The mode of feeding during the reversing is adopted, the feeding amount per period is 700kg, the number of the periods per day is 24 periods, and the reversing period is set to be 40 seconds. Setting the kiln to operate in an ignition mode, setting the opening of a combustion-supporting air adjusting valve 19 to be 15 degrees, starting a combustion-supporting fan 16, and feeding combustion-supporting air to an ignition burner 12 through a combustion-supporting air pipe 17; an ignited acetylene long gun extends into the middle channel 1 from the fire door 3, so that acetylene flame is positioned below the ignition burner 12; and (3) starting the gas pressurizer 29, feeding gas into the ignition burner 12 through the first gas quick-cutting valve 30 and the first gas stop valve 9, igniting the gas by acetylene flame, and immediately closing the fire door 3. After the combustion flame of the ignition burner 12 is stabilized, starting a kiln cooling fan 15 and baking the kiln;
e. in the process of baking, the operation is carried out according to the baking curve and the control requirement of the table 1, the flow of combustion-supporting air is controlled by adjusting the combustion-supporting fan 16, the gas supply amount conveyed to the ignition burner 12 is controlled by adjusting the gas pressurizer 29, the temperature rise speed of the thermocouple 2 of the middle channel is controlled according to the requirement of figure 6, the temperature rise of the thermocouple 2 of the middle channel is controlled not to exceed 20 ℃ per hour, so that the temperature rise is uniform, wherein the control deviation of the combustion-supporting air amount and the cooling air amount is +/-500 m3H, the deviation of gas supply control is +/-200 m3And h, the temperature deviation of the thermocouple of the middle channel is +/-50 ℃. The combustion-supporting air is conveyed into the kiln chamber A through a combustion-supporting air reversing valve 7 on the kiln chamber A to support combustionThe air and the cooling air convey the heat of the flue gas combusted by the ignition burner 12 of the middle channel 1 into the kiln chamber B, and the stone and coke in the kiln chamber B are preheated, wherein the kiln chamber A is a combustion chamber, and the kiln chamber B is a heat storage chamber, as shown in figure 1. After the reversing period of 40 seconds, the working states of the kiln chamber A and the kiln chamber B are switched, combustion-supporting air is conveyed into the kiln chamber B through a combustion-supporting air reversing valve 7 on the kiln chamber B, the combustion-supporting air and cooling air send the heat of flue gas combusted by the ignition burner 12 into the kiln chamber A, stones and coke in the kiln chamber A are preheated, at the moment, the kiln chamber A is a heat storage chamber, and the kiln chamber B is a combustion chamber, and is shown in figure 2;
f. after the coke below the head of the spray gun 5 is ignited, when the temperature below the head of the spray gun 5 of the kiln chamber A and the kiln chamber B reaches above 700 ℃, the coal gas is conveyed to the spray gun 5 for ignition, and normal production conditions are changed; immediately arranging the shutdown, removing the ignition burner 12 and installing an optical pyrometer;
g. the kiln capacity setting is changed into 380 tons/day, the conversion coefficient of the limestone raw material quality conversion finished product is set to be 0.55, the conversion coefficient is the mass number of the lime finished product after each 1kg of limestone raw material is calcined, the feeding amount per period is 6000kg, and the calcination period per day is set to be 90 periods; the excess air ratio was set to 1.0 and the cooling air ratio was set to 0.7. The kiln is set to run in a production mode, all second gas stop valves 22 communicated with the spray guns 5 on the gas ring pipes 21 of the kiln chamber A and the kiln chamber B are opened, all spray gun stop valves 24 on the spray gun cooling air ring pipes 25 of the kiln chamber A and the kiln chamber B are opened, the combustion-supporting air adjusting valve 19 is completely opened, and the combustion-supporting air stop valve 10 is closed. And starting a spray gun cooling fan 28, opening a spray gun cooling air reversing valve 26, and feeding spray gun cooling air to the spray gun 5 through a spray gun cooling air pipe 27, the spray gun cooling air reversing valve 26, a spray gun cooling air ring pipe 25, a spray gun stop valve 24 and a spray gun check valve 23 to cool the spray gun. Confirming that the bypass valve 32 connected in parallel with the return valve 33 on the gas pipeline 11 is completely closed, then starting the gas pressurizer 29, opening the first gas quick-cutting valve 30 and the second gas quick-cutting valve 31 connected with the combustion chamber, closing the return valve 33, feeding gas to all the spray guns 5 on the combustion chamber through the gas ring pipe 21 and the second gas stop valve 22, and ensuring that all the spray guns 5 in the combustion chamber are ignited under the condition that coke is used as an ignition source. When gas is sent to the spray gun 5, attention is paid to observe a temperature curve graph of the optical pyrometer, when the temperature displayed by the optical pyrometer is continuously reduced within 3 minutes after the system starts to send the gas to the spray gun 5, the gas is cut off after the spray gun is not ignited, the ignition burner 12 is installed again, and the ignition and the furnace drying are carried out through the ignition burner 12 again;
h. the kiln is operated for 12 minutes, after a reversing period of 40 seconds, the combustion chamber and the heat storage chamber are switched, and a new cycle of periodic combustion is started; and (4) performing alternate and cyclic production, namely obtaining a finished qualified material after 36 hours of ignition by the spray gun 5.
The method for quickly igniting and drying the furnace in the Mach-Zehnder kiln can realize quick ignition, shorten the time from the ignition of a cold kiln to the discharge of finished qualified materials from 9-10 days to 3-4 days, greatly shorten the period of igniting and drying the furnace, and enable the furnace to be put into production as soon as possible3The calculation of/h can save 1000m324h × 24h × 6 d × 0.245.245 yuan/m3=3.528 ten thousand yuan (note: 0.245 yuan/m in the formula)3As gas prices). The economic benefits are as follows: 14.76 ten thousand yuan +1.8 ten thousand yuan +3.528 ten thousand yuan =20.09 ten thousand yuan. By reducing the generation of waste materials, the generation of industrial garbage is reduced, and the environmental pollution is reduced.
Example 2
A method for rapid ignition baking of a malz kiln, the construction of which is shown in fig. 1, 3, 4, 5, comprising the steps of:
a. the kiln is qualified by a tightness pressure test before opening the kiln and drying the furnace;
b. adding dry stone into the kiln to a position 1.0m lower than the lower end of the head of the spray gun 5 through a single-hopper and other feeding systems, wherein particles with the particle size of 40-80 mm in the stone account for more than 80% of the weight of the stone;
c. preparing a mixture from dried stone and coke according to a weight ratio of 5:3, wherein particles with the particle size of 10-40 mm in the coke account for more than 80% of the weight of the coke; then adding the obtained mixture into the kiln through a single-hopper feeding system, adding the mixture to a position 3.5m higher than the lower end of the head of the spray gun 5 to enable the mixture to completely cover the head of the spray gun, and adding dry stone to a position completely covering the spray gun box 6, wherein the position C in the figure 1 is a stone layer surface, and the stone is limestone raw material;
d. the capacity of the kiln ignition oven is set to be 30 tons/day, the conversion coefficient of the finished product of the limestone raw material quality conversion is set to be 0.60, and the conversion coefficient is the mass number of the finished product of lime converted after each 1kg of limestone raw material is calcined. The mode of "feeding during commutation" was used, the feeding amount per cycle was 2200kg, the number of cycles per day was 36 cycles, and the commutation period was set to 90 seconds. Setting the kiln to operate in an ignition mode, setting the opening of a combustion-supporting air adjusting valve 19 to be 45 degrees, starting a combustion-supporting fan 16, and feeding combustion-supporting air to an ignition burner 12 through a combustion-supporting air pipe 17; an ignited acetylene long gun extends into the middle channel 1 from the fire door 3, so that acetylene flame is positioned below the ignition burner 12; and (3) starting the gas pressurizer 29, feeding gas into the ignition burner 12 through the first gas quick-cutting valve 30 and the first gas stop valve 9, igniting the gas by acetylene flame, and immediately closing the fire door 3. After the combustion flame of the ignition burner 12 is stabilized, starting a kiln cooling fan 15 and baking the kiln;
e. in the baking process, the operation is carried out according to the baking curve and the control requirement in the table 1 in the embodiment 1, the flow of the combustion-supporting air is controlled by adjusting the combustion-supporting fan 16, and the gas pressurizer 29 is adjusted to control the delivery to the ignitionControlling the temperature rise speed of the middle channel thermocouple 2 according to the requirement of figure 6 for the gas supply quantity of the burner 12, controlling the temperature rise speed of the middle channel thermocouple 2 not to exceed 20 ℃ per hour, and enabling the temperature to rise uniformly, wherein the control deviation of combustion supporting air quantity and cooling air quantity is +/-500 m3H, the deviation of gas supply control is +/-200 m3And h, the temperature deviation of the thermocouple of the middle channel is +/-50 ℃. Combustion-supporting air is conveyed into the kiln chamber A through a combustion-supporting air reversing valve 7 on the kiln chamber A, the combustion-supporting air and cooling air convey the heat of flue gas combusted by an ignition burner 12 of the middle channel 1 into the kiln chamber B, stone and coke in the kiln chamber B are preheated, at the moment, the kiln chamber A is a combustion chamber, and the kiln chamber B is a heat storage chamber, as shown in figure 1. After a reversing period of 90 seconds, switching the working states of the kiln chamber A and the kiln chamber B, conveying combustion-supporting air into the kiln chamber B through a combustion-supporting air reversing valve 7 on the kiln chamber B, conveying the heat of flue gas combusted by an ignition burner 12 into the kiln chamber A together with the combustion-supporting air, preheating stones and coke in the kiln chamber A, wherein the kiln chamber A is a heat storage chamber and the kiln chamber B is a combustion chamber, and is shown in figure 2;
f. after the coke below the head of the spray gun 5 is ignited, when the temperature below the head of the spray gun 5 of the kiln chamber A and the kiln chamber B reaches above 700 ℃, the coal gas is conveyed to the spray gun 5 for ignition, and normal production conditions are changed; immediately arranging the shutdown, removing the ignition burner 12 and installing an optical pyrometer;
g. the kiln capacity setting is changed into 450 tons/day, the conversion coefficient of the limestone raw material quality conversion finished product is set to be 0.60, the conversion coefficient is the mass number of the lime finished product after each 1kg of limestone raw material is calcined, the feeding amount per period is 7400kg, and the calcination period per day is set to be 100 periods; the excess air ratio was set to 1.10 and the cooling air ratio was set to 1.0. The kiln is set to run in a production mode, all second gas stop valves 22 communicated with the spray guns 5 on the gas ring pipes 21 of the kiln chamber A and the kiln chamber B are opened, all spray gun stop valves 24 on the spray gun cooling air ring pipes 25 of the kiln chamber A and the kiln chamber B are opened, the combustion-supporting air adjusting valve 19 is completely opened, and the combustion-supporting air stop valve 10 is closed. And starting a spray gun cooling fan 28, opening a spray gun cooling air reversing valve 26, and feeding spray gun cooling air to the spray gun 5 through a spray gun cooling air pipe 27, the spray gun cooling air reversing valve 26, a spray gun cooling air ring pipe 25, a spray gun stop valve 24 and a spray gun check valve 23 to cool the spray gun. Confirming that the bypass valve 32 connected in parallel with the return valve 33 on the gas pipeline 11 is completely closed, then starting the gas pressurizer 29, opening the first gas quick-cutting valve 30 and the second gas quick-cutting valve 31 connected with the combustion chamber, closing the return valve 33, feeding gas to all the spray guns 5 on the combustion chamber through the gas ring pipe 21 and the second gas stop valve 22, and ensuring that all the spray guns 5 in the combustion chamber are ignited under the condition that coke is used as an ignition source. When gas is sent to the spray gun 5, attention is paid to observe a temperature curve graph of the optical pyrometer, when the temperature displayed by the optical pyrometer is continuously reduced within 3 minutes after the system starts to send the gas to the spray gun 5, the gas is cut off after the spray gun is not ignited, the ignition burner 12 is installed again, and the ignition and the furnace drying are carried out through the ignition burner 12 again;
h. the kiln is operated for 15 minutes, after a reversing period of 90 seconds, the combustion chamber and the heat storage chamber are switched, and a new cycle of periodic combustion is started; and (4) performing alternate and cyclic production, namely obtaining a finished qualified material after 36 hours of ignition by the spray gun 5.
Claims (2)
1. A method for quickly igniting and baking a furnace by a Maerz kiln is characterized by comprising the following steps:
a. the kiln is qualified by a tightness pressure test before opening the kiln and drying the furnace;
b. adding dry stone into the kiln to a position 0.5-1.0 m lower than the lower end of the head of the spray gun (5), wherein particles with the particle size of 40-80 mm in the stone account for more than 80% of the weight of the stone;
c. preparing a mixture from dried stone and coke according to a weight ratio of 5: 1-5: 3, wherein particles with a particle size of 10-40 mm in the coke account for more than 80% of the weight of the coke; then adding the obtained mixture into a kiln, adding the mixture to a position 3.0-3.5 m higher than the lower end of the head of the spray gun (5), and adding dry stones to a position completely covering the spray gun box (6);
d. setting the kiln ignition and drying capacity to be 5-30 tons/day, and setting the conversion coefficient of the limestone raw material quality conversion finished product to be 0.55-0.60; the mode of feeding during the reversing is adopted, the feeding amount per period is 700 kg-2200 kg, the cycle number per day is 24-36 periods, and the reversing period is set to be 40 seconds-90 seconds; the kiln is set to operate in an ignition mode, a combustion-supporting air adjusting valve (19) is set to have an opening degree of 15-45 degrees, a combustion-supporting fan (16) is started to feed combustion-supporting air to an ignition burner (12), and a ignited acetylene long gun is used to extend into the middle channel (1) from a fire poking door (3) so that acetylene flame is positioned below the ignition burner (12); starting a gas pressurizer (29) to feed gas into the ignition burner (12), igniting the gas by acetylene flame, and immediately closing the fire door (3); after the combustion flame of the ignition burner (12) is stable, a kiln cooling fan (15) is started to dry the kiln;
e. in the process of baking the furnace, according to the requirements of a baking furnace curve, the temperature rising speed of the middle channel thermocouple (2) is controlled by adjusting the flow rate of combustion-supporting air and the supply amount of coal gas, the temperature rising speed of the middle channel thermocouple (2) is controlled to be not more than 20 ℃ per hour, so that the temperature rises uniformly, wherein the temperature deviation of the middle channel thermocouple (2) is +/-50 ℃; combustion-supporting air is conveyed into the kiln chamber A through a combustion-supporting air reversing valve (7) on the kiln chamber A, the combustion-supporting air and cooling air convey the heat of flue gas combusted by an ignition burner (12) of the middle channel (1) into the kiln chamber B together, stone and coke in the kiln chamber B are preheated, at the moment, the kiln chamber A is a combustion chamber, and the kiln chamber B is a heat storage chamber; after a reversing period of 40-90 seconds, switching the working states of a kiln chamber A and a kiln chamber B, conveying combustion-supporting air into the kiln chamber B through a combustion-supporting air reversing valve (7) on the kiln chamber B, conveying the heat of flue gas combusted by an ignition burner (12) into the kiln chamber A by the combustion-supporting air and cooling air, and preheating stones and coke in the kiln chamber A, wherein the kiln chamber A is a heat storage chamber and the kiln chamber B is a combustion chamber;
f. after the coke below the head of the spray gun (5) is ignited, when the temperature below the head of the spray gun (5) of the kiln chamber A and the kiln chamber B reaches above 700 ℃, coal gas is conveyed to the spray gun (5) for ignition, and normal production conditions are changed; immediately arranging the shutdown of the kiln, closing the first gas stop valve (9) and the combustion-supporting air stop valve (10), removing the ignition burner (12), and installing an optical pyrometer;
g. the kiln capacity setting is changed into 380-450 tons/day, the conversion coefficient of the limestone raw material quality conversion finished product is set to be 0.55-0.60, the feeding amount per period is 6000-7400 kg, and the calcination period per day is set to be 90-100 periods; setting the coefficient of the surplus air to be 1.0-1.10 and the coefficient of the cooling air to be 0.7-1.0; the kiln is set to run in a production mode, all second coal gas stop valves (22) and spray gun stop valves (24) which are communicated with the spray guns (5) on the kiln chamber A and the kiln chamber B are opened, and the combustion-supporting air regulating valve (19) is completely opened; closing a combustion-supporting air stop valve (10), confirming that a bypass valve (32) is completely closed, then starting a gas pressurizer (29), opening a first gas quick-cutting valve (30) and a second gas quick-cutting valve (31) connected with a combustion chamber, closing a return valve (33), feeding gas to all spray guns (5) on the combustion chamber, and ensuring that all spray guns (5) in the combustion chamber are ignited under the condition that coke is used as an ignition source;
h. the kiln is operated for 12-15 minutes, and after a kiln reversing period of 40-90 seconds, the combustion chamber and the heat storage chamber are switched, and a new cycle of periodic combustion is started; the alternate and cyclic production is carried out, and the finished qualified material can be obtained after the continuous production in the kiln for 36 hours.
2. The method for rapid ignition of a maez kiln according to claim 1, characterized in that: when gas is fed into the spray gun (5), attention is paid to the temperature curve diagram of the optical pyrometer, when the temperature of the optical pyrometer is continuously reduced within 3 minutes after the system starts to feed the gas into the spray gun (5), the gas is cut off after the spray gun is not ignited, the ignition burner (12) is reinstalled, and the ignition furnace is ignited and dried again through the ignition burner (12).
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| CN111947182A (en) * | 2020-08-24 | 2020-11-17 | 广东韶钢松山股份有限公司 | Double-chamber lime shaft kiln ignition device and method |
| CN112066736A (en) * | 2020-08-25 | 2020-12-11 | 浙江石油化工有限公司 | Method for baking double-hearth tubular heating furnace |
| CN112079582A (en) * | 2020-09-28 | 2020-12-15 | 石家庄圣宏达热能工程技术股份有限公司 | Shaft kiln device with parallel-flow calcination and countercurrent heat storage and transformation method thereof |
| CN112097537A (en) * | 2020-08-25 | 2020-12-18 | 浙江石油化工有限公司 | Oven temperature automatic control method based on slope signal |
| CN112090379A (en) * | 2020-08-25 | 2020-12-18 | 浙江石油化工有限公司 | Heating furnace drying temperature control method |
| CN114111346A (en) * | 2021-11-30 | 2022-03-01 | 广东韶钢松山股份有限公司 | Fire-blending temperature-raising quick reproduction method after double-chamber kiln overhaul |
| CN114353505A (en) * | 2021-12-15 | 2022-04-15 | 广西柳州钢铁集团有限公司 | Environment-friendly efficient double-chamber kiln |
| CN115140956A (en) * | 2021-03-28 | 2022-10-04 | 舞钢中加钢铁有限公司 | Novel environment-friendly blow-in process of lime kiln |
| CN115872634A (en) * | 2022-12-05 | 2023-03-31 | 包头钢铁（集团）有限责任公司 | Operation method for rapid kiln drying of Maerz kiln |
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| CN111947182A (en) * | 2020-08-24 | 2020-11-17 | 广东韶钢松山股份有限公司 | Double-chamber lime shaft kiln ignition device and method |
| CN111947182B (en) * | 2020-08-24 | 2022-03-11 | 广东韶钢松山股份有限公司 | Double-chamber lime shaft kiln ignition device and method |
| CN112066736A (en) * | 2020-08-25 | 2020-12-11 | 浙江石油化工有限公司 | Method for baking double-hearth tubular heating furnace |
| CN112097537A (en) * | 2020-08-25 | 2020-12-18 | 浙江石油化工有限公司 | Oven temperature automatic control method based on slope signal |
| CN112090379A (en) * | 2020-08-25 | 2020-12-18 | 浙江石油化工有限公司 | Heating furnace drying temperature control method |
| CN112090379B (en) * | 2020-08-25 | 2021-11-19 | 浙江石油化工有限公司 | Heating furnace drying temperature control method |
| CN112066736B (en) * | 2020-08-25 | 2022-03-15 | 浙江石油化工有限公司 | Method for baking double-hearth tubular heating furnace |
| CN112079582A (en) * | 2020-09-28 | 2020-12-15 | 石家庄圣宏达热能工程技术股份有限公司 | Shaft kiln device with parallel-flow calcination and countercurrent heat storage and transformation method thereof |
| CN115140956A (en) * | 2021-03-28 | 2022-10-04 | 舞钢中加钢铁有限公司 | Novel environment-friendly blow-in process of lime kiln |
| CN114111346A (en) * | 2021-11-30 | 2022-03-01 | 广东韶钢松山股份有限公司 | Fire-blending temperature-raising quick reproduction method after double-chamber kiln overhaul |
| CN114111346B (en) * | 2021-11-30 | 2023-12-01 | 广东韶钢松山股份有限公司 | Method for quickly reproducing double-hearth kiln after overhauling by adding fire and raising temperature |
| CN114353505A (en) * | 2021-12-15 | 2022-04-15 | 广西柳州钢铁集团有限公司 | Environment-friendly efficient double-chamber kiln |
| CN114353505B (en) * | 2021-12-15 | 2023-11-21 | 广西柳州钢铁集团有限公司 | Environment-friendly high-efficiency double-hearth kiln control method |
| CN115872634A (en) * | 2022-12-05 | 2023-03-31 | 包头钢铁（集团）有限责任公司 | Operation method for rapid kiln drying of Maerz kiln |
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