CN114111346B - Method for quickly reproducing double-hearth kiln after overhauling by adding fire and raising temperature - Google Patents
Method for quickly reproducing double-hearth kiln after overhauling by adding fire and raising temperature Download PDFInfo
- Publication number
- CN114111346B CN114111346B CN202111443530.XA CN202111443530A CN114111346B CN 114111346 B CN114111346 B CN 114111346B CN 202111443530 A CN202111443530 A CN 202111443530A CN 114111346 B CN114111346 B CN 114111346B
- Authority
- CN
- China
- Prior art keywords
- chamber
- temperature
- maintenance
- overhaul
- hearth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000012423 maintenance Methods 0.000 claims abstract description 92
- 239000007921 spray Substances 0.000 claims abstract description 50
- 239000000463 material Substances 0.000 claims abstract description 41
- 238000004519 manufacturing process Methods 0.000 claims abstract description 31
- 238000002485 combustion reaction Methods 0.000 claims abstract description 29
- 238000005086 pumping Methods 0.000 claims abstract description 9
- 239000000779 smoke Substances 0.000 claims abstract description 9
- 238000005338 heat storage Methods 0.000 claims abstract description 7
- 239000004575 stone Substances 0.000 claims description 19
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 18
- 239000003546 flue gas Substances 0.000 claims description 17
- 239000007789 gas Substances 0.000 claims description 12
- 239000011819 refractory material Substances 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 7
- 238000011084 recovery Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract description 13
- 235000008733 Citrus aurantifolia Nutrition 0.000 abstract description 10
- 235000011941 Tilia x europaea Nutrition 0.000 abstract description 10
- 239000004571 lime Substances 0.000 abstract description 10
- 239000000446 fuel Substances 0.000 abstract description 7
- 101100399296 Mus musculus Lime1 gene Proteins 0.000 description 9
- 238000001816 cooling Methods 0.000 description 8
- 230000000630 rising effect Effects 0.000 description 6
- 238000009825 accumulation Methods 0.000 description 5
- 238000002156 mixing Methods 0.000 description 4
- 239000002737 fuel gas Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 206010017740 Gas poisoning Diseases 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- 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
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
- F27D1/1636—Repairing linings by projecting or spraying refractory materials on the lining
- F27D1/1642—Repairing linings by projecting or spraying refractory materials on the lining using a gunning apparatus
-
- 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
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- 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
-
- 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
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/15—Tapping equipment; Equipment for removing or retaining slag
- F27D3/1545—Equipment for removing or retaining slag
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
- F27D2019/0034—Regulation through control of a heating quantity such as fuel, oxidant or intensity of current
- F27D2019/004—Fuel quantity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
- F27D2019/0056—Regulation involving cooling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a method for quickly reproducing double-hearth kiln after maintenance by hot charging and temperature raising, and relates to the technical field of metallurgical lime. Firstly, overhauling an overhauling chamber after stopping a kiln, and keeping the temperature of a spray gun of a non-overhauling chamber not lower than a first preset temperature; then feeding materials into the overhaul chamber step by step after overhaul is completed, igniting the non-overhaul chamber to enter a combustion state, and continuously pumping high-temperature smoke of the non-overhaul chamber into the overhaul chamber for a preset time period so as to enable the temperature of a spray gun of the overhaul chamber to rise to a first preset temperature; and then the overhauling chamber is ignited to enter a combustion state, and the non-overhauling chamber is controlled to be switched into a heat storage state, so that normal alternate reversing production is recovered. The method for quickly reproducing the double-hearth kiln after the maintenance of the double-hearth kiln by adding fire and raising temperature can quickly realize reproduction after the maintenance is finished, shorten the temperature raising time, improve the reproduction efficiency and avoid the occurrence of the conditions of waste and waste of fuel.
Description
Technical Field
The invention relates to the technical field of metallurgical lime, in particular to a method for quickly reproducing the lime by adding fire and raising the temperature after double-hearth kiln overhaul.
Background
At present, the double-hearth kiln is one of the main stream kiln types in the lime industry due to the characteristics of high yield, high quality and low consumption. After the components such as preheating zone kiln lining refractory materials or spray guns in the kiln chamber are damaged, stopping the kiln for cooling is needed, and the kiln chamber is manually entered for maintenance. When maintenance is completed and production needs to be restored, due to longer kiln stopping time, particularly kiln bores of parts such as kiln lining refractory materials of a preheating zone or a spray gun are replaced, cold materials are filled, at the moment, the temperature of the spray gun of the kiln bores is always reduced to below 600 ℃, the temperature is lower than the ignition point of fuel gas, if the direct supply of the fuel gas is ignited, the safety risk of ignition failure of the fuel gas exists, and in order to ensure safety, the spray gun is usually heated by adopting an ignition burner ignition mode before kiln starting and reproduction, but in this way, the production operation is complicated, the temperature rising time is long, more waste materials are generated, and the fuel cost is wasted.
In view of the above, the design of the double-hearth kiln overhaul back fire-mixing and temperature-raising rapid production method with high production efficiency is particularly important in lime smelting.
Disclosure of Invention
The invention aims to provide a method for quickly reproducing the double-hearth kiln after maintenance, which can quickly realize reproduction after the maintenance is finished, shorten the temperature raising time, improve the reproduction efficiency and avoid the occurrence of the conditions of waste and fuel waste.
The invention is realized by adopting the following technical scheme.
The method for quickly reproducing the double-hearth kiln after the maintenance of the double-hearth kiln by mixing fire and raising the temperature is applied to the double-hearth kiln, the double-hearth kiln comprises a maintenance hearth and a non-maintenance hearth which are communicated with each other, and the method for quickly reproducing the double-hearth kiln after the maintenance of the double-hearth kiln by mixing fire and raising the temperature comprises the following steps: after stopping the kiln, overhauling the overhauling chamber, and keeping the temperature of a spray gun of the non-overhauling chamber not lower than a first preset temperature; after the overhaul is completed, gradually feeding materials into the overhaul chamber, igniting the non-overhaul chamber to enter a combustion state, and continuously pumping high-temperature smoke of the non-overhaul chamber into the overhaul chamber for a preset time period so as to enable the temperature of a spray gun of the overhaul chamber to rise to a first preset temperature; and igniting the overhaul chamber to enter a combustion state, controlling the non-overhaul chamber to be switched into a heat accumulation state, and recovering normal alternate reversing production.
Optionally, the preset duration ranges from 5 to 8 hours and the first preset temperature is 600 degrees celsius.
Optionally, after the overhaul is completed, feeding materials into the overhaul chamber step by step, igniting the non-overhaul chamber to enter a combustion state, and continuously pumping high-temperature smoke of the non-overhaul chamber into the overhaul chamber for a preset time period so as to enable the temperature of a spray gun of the overhaul chamber to rise to a first preset temperature, wherein the steps of: feeding materials into the overhaul chamber to the top of the spray gun box after overhaul is completed, and igniting the non-overhaul chamber to enter a combustion state; and continuously pumping high-temperature smoke of the non-overhaul chamber into the overhaul chamber within a preset time period to enable the temperature of a spray gun of the overhaul chamber to rise to a first preset temperature, and adding stones into the overhaul chamber in batches by adopting a charging mode during reversing until a level indicator displays the level.
Optionally, high-temperature flue gas of the non-overhaul chamber is continuously pumped into the overhaul chamber within a preset time period, so that the temperature of a spray gun of the overhaul chamber is increased to a first preset temperature, and stone is added into the overhaul chamber in batches by adopting a charging mode during reversing until the material level of the material level meter is displayed, wherein the time period between two adjacent charging is 12 minutes to 14 minutes.
Optionally, high-temperature flue gas of the non-overhaul chamber is continuously pumped into the overhaul chamber within a preset duration, so that the temperature of a spray gun of the overhaul chamber is raised to a first preset temperature, and stone is added into the overhaul chamber in batches by adopting a charging mode during reversing until the charge level of the charge level indicator is displayed, wherein the range of kiln-entering gas quantity is 7000 cubic meters/hour to 12000 cubic meters/hour, and the range of combustion-supporting air coefficient is controlled to be 1.05 to 1.25.
Optionally, high-temperature flue gas of the non-overhaul chamber is continuously pumped into the overhaul chamber within a preset period of time, so that the temperature of a spray gun of the overhaul chamber is increased to a first preset temperature, and stone is added into the overhaul chamber in batches in a charging mode during reversing until a level indicator displays the level, the channel temperature between the overhaul chamber and the non-overhaul chamber is controlled to be 600-950 ℃, and the temperature is uniformly increased to be 10-15 ℃ every preset period, wherein the range of the preset period is 12-14 minutes.
Optionally, high-temperature flue gas of the non-overhaul chamber is continuously pumped into the overhaul chamber within a preset duration, so that the temperature of a spray gun of the overhaul chamber is raised to a first preset temperature, and stone is added into the overhaul chamber in batches in a charging mode during reversing until the level indicator displays the level, wherein the stay time of the stone in the overhaul chamber is controlled to be 23-28 hours, and the ash discharge frequency of the overhaul chamber is controlled to be 3-6 times.
Optionally, the step of overhauling the overhauling chamber after stopping the kiln and keeping the temperature of the spray gun of the non-overhauling chamber not lower than the first preset temperature comprises the following steps of: after stopping the kiln, controlling the overhaul chamber to discharge ash and discharge the material so as to enable the actual material level to be reduced to a preset material level; and reducing the temperature of the overhaul chamber, overhauling the overhaul chamber, and keeping the temperature of the spray gun of the non-overhaul chamber not lower than the first preset temperature.
Optionally, the step of reducing the temperature of the service chamber and servicing the service chamber, and maintaining the spray gun temperature of the non-service chamber not below the first preset temperature comprises: feeding 1 to 3 times into the overhaul chamber so as to lower the temperature of the overhaul chamber; outside air is pumped into the overhaul chamber by the variable-frequency induced draft fan and is discharged outwards through the non-overhaul chamber, and the outside air enters the overhaul chamber manually to overhaul the spray gun box, the kiln lining refractory material of the preheating zone or the spray gun.
Optionally, the step of igniting the overhaul chamber to enter a combustion state and controlling the non-overhaul chamber to enter a heat accumulation state to restore normal alternate reversing production comprises the following steps: when the temperature of the channel between the overhaul chamber and the non-overhaul chamber is increased to a second preset temperature, gradually increasing ash discharging efficiency of the overhaul chamber and the non-overhaul chamber to a normal state, wherein the second preset temperature ranges from 950 ℃ to 1050 ℃.
The method for quickly reproducing the double-hearth kiln after the overhaul by hot-blending and temperature-raising has the following beneficial effects:
according to the method for quickly reproducing the double-hearth kiln after the double-hearth kiln is overhauled, the overhauling hearth is overhauled after the kiln is stopped, and the temperature of a spray gun of a non-overhauling hearth is kept not lower than a first preset temperature; then feeding materials into the overhaul chamber step by step after overhaul is completed, igniting the non-overhaul chamber to enter a combustion state, and continuously pumping high-temperature smoke of the non-overhaul chamber into the overhaul chamber for a preset time period so as to enable the temperature of a spray gun of the overhaul chamber to rise to a first preset temperature; and then the overhauling chamber is ignited to enter a combustion state, and the non-overhauling chamber is controlled to be switched into a heat storage state, so that normal alternate reversing production is recovered. Compared with the prior art, the method for quickly reproducing the double-hearth kiln after the maintenance is finished by adding the fire and raising the temperature gradually into the maintenance hearth, igniting the non-maintenance hearth to enter a combustion state, and continuously sucking high-temperature flue gas of the non-maintenance hearth into the maintenance hearth for a preset time period so as to raise the temperature of a spray gun of the maintenance hearth to a first preset temperature, thereby quickly realizing reproduction after the maintenance is finished, shortening the temperature raising time, improving the reproduction efficiency and avoiding the occurrence of the conditions of waste and fuel waste.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of steps of a method for quick reproduction of hot-mix temperature increase after maintenance of a double-hearth kiln according to an embodiment of the invention;
FIG. 2 is a gas flow chart of the method for quick heat transfer and temperature raising and reproduction after maintenance of the double-hearth kiln, which is provided by the embodiment of the invention, during the maintenance;
fig. 3 is a gas flow chart of the method for quick re-production by hot charging and temperature raising after maintenance of the double-hearth kiln in the embodiment of the invention during normal production.
Icon: 100-double-hearth kiln; 110-overhaul chamber; 120-channel; 130-non-service bore.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "inner", "outer", "upper", "lower", "horizontal", etc., are directions or positional relationships based on those shown in the drawings, or those that are conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Some embodiments of the present invention are described in detail below with reference to the accompanying drawings. Features of the embodiments described below may be combined with each other without conflict.
Referring to fig. 1, fig. 2 and fig. 3 (arrows in fig. 2 and fig. 3 indicate gas flow directions), an embodiment of the present invention provides a method for quick re-production by hot charging and temperature raising after dual-chamber kiln maintenance, which is used for realizing maintenance and re-production of dual-chamber kiln 100. The device can realize the production again rapidly after the maintenance is finished, shortens the temperature raising time, improves the production again efficiency, and avoids the occurrence of the situations of waste and fuel waste.
It should be noted that, the method of quick heat exchanging and temperature raising and reproduction after double-chamber kiln maintenance is applied to the double-chamber kiln 100, the double-chamber kiln 100 includes a first chamber and a second chamber, and the first chamber is communicated with the second chamber through a channel 120. Specifically, when the first kiln chamber needs to be overhauled, the first kiln chamber is an overhauling chamber 110, and the second kiln chamber is a non-overhauling chamber 130; when the second kiln chamber needs to be overhauled, the first kiln chamber is a non-overhauling chamber 130, and the second kiln chamber is an overhauling chamber 110; the overhaul and the production recovery methods of the first kiln chamber and the second kiln chamber are the same.
The method for quickly reproducing the double-hearth kiln after the maintenance by adding fire and heating comprises the following steps:
step S110: after stopping the kiln, the maintenance chamber 110 is maintained, and the temperature of the spray gun of the non-maintenance chamber 130 is kept not lower than the first preset temperature.
In step S110, the kiln stopping operation is performed between 10 seconds and 30 seconds before the period of the double-chamber kiln 100 is shifted, so that the maintenance chamber 110 is in a burning state before the kiln stopping operation, and the non-maintenance chamber 130 is in a heat storage state before the kiln stopping operation, so that the maintenance chamber 110 can be immediately shifted to the heat storage state after the maintenance is completed and the production is resumed, and the non-maintenance chamber 130 can be immediately shifted to the burning state.
Specifically, step S110 includes two steps, namely:
step S111: after stopping the kiln, the overhaul chamber 110 is controlled to discharge ash and discharge the material so that the actual material level is reduced to the preset material level.
In step S111, the overhaul chamber 110 is controlled to continuously move the kiln to discharge ash, and if the ash temperature rises to 180 degrees celsius during the ash discharge, the variable frequency cooling fan is turned on, and the rotational speed of the variable frequency cooling fan is set between 250 rpm and 300 rpm until the actual material level in the overhaul chamber 110 is reduced to the preset material level.
In this embodiment, if the spray gun box or the preheating zone kiln liner of the overhaul chamber 110 is overhauled, the preset material level is controlled to be within a range of 500 mm to 1000 mm below the replacement overhaul position, so that the spray gun box and the preheating zone kiln liner are overhauled conveniently; if the spray gun of the service bore 110 is serviced, the predetermined level is controlled to be in the range of 500 mm to 1000 mm below the muzzle of the spray gun, so as to facilitate the service of the spray gun.
Step S112: lowering the temperature of the service chamber 110 and service the service chamber 110, and maintaining the gun temperature of the non-service chamber 130 not lower than the first preset temperature.
It should be noted that, in step S112, after the material level of the overhaul chamber 110 is lowered in place, a cold furnace operation is performed until the temperature in the overhaul chamber 110 is lowered to between 30 and 45 ℃, and the carbon monoxide concentration is lower than 24 parts per million, so as to ensure that an overhaul worker can safely enter the overhaul chamber 110 to perform an overhaul operation. Meanwhile, the non-overhaul chamber 130 is kept to be less in moving materials, in the step, the non-overhaul chamber 130 only needs to move one batch of furnaces, and the number of times of actions of the ash discharging mechanism is 5 times/batch, so that lime binding and material covering in the non-overhaul chamber 130 can be reduced, and heat loss of the non-overhaul chamber 130 can be reduced to the greatest extent.
Specifically, step S112 includes two steps, namely:
step S1121: the service chamber 110 is charged 1 to 3 times to depress the temperature of the service chamber 110.
In step S1121, the service chamber 110 is charged to achieve auxiliary cooling of the service chamber 110, so that a service person can enter the service chamber 110 earlier for safe operation.
Step S1122: outside air is pumped into the overhaul chamber 110 by utilizing the variable-frequency induced draft fan and is discharged outwards through the non-overhaul chamber 130, and the outside air enters the overhaul chamber manually to overhaul the spray gun box, the preheating zone kiln lining refractory material or the spray gun.
It should be noted that, in step S1122, the manhole at the kiln top is opened, the reversing valve at the kiln top is switched, the variable frequency induced draft fan is turned on, external cold air enters the maintenance chamber 110 through the manhole at the top of the maintenance chamber 110 to reduce the temperature of the maintenance chamber 110, and hot air in the maintenance chamber 110 is pumped to the non-maintenance chamber 130 to maintain the temperature of the non-maintenance chamber 130, and finally flue gas is discharged outwards through the manhole at the top of the non-maintenance chamber 130.
In this embodiment, before the manual work enters the overhaul chamber 110, the rotation speed range of the variable frequency induced draft fan is controlled to be 250 rpm to 350 rpm, and the operation time of the variable frequency induced draft fan is between 0.5 hour and 1 hour under the rotation speed, so that the overhaul chamber 110 is cooled to be between 30 ℃ and 45 ℃, and the temperature of the flue gas at the kiln top of the non-overhaul chamber 130 is less than or equal to 180 ℃.
Further, after the dust enters the overhaul chamber 110 manually, the overhaul chamber 110 is kept from dust, the rotating speed range of the variable-frequency induced draft fan is controlled to be 300-400 rpm, so that the negative pressure value range of kiln top smoke is between-0.30 kilopascals and-0.45 kilopascals, the good ventilation in the overhaul chamber 110 is ensured, and the safety operation of overhaul personnel is ensured. Meanwhile, the non-overhaul chamber 130 is kept to be less in moving material, in the step, the non-overhaul chamber 130 is controlled to discharge ash 1 time every 8 hours, and the number of actions of the ash discharging mechanism is 3 to 5 times/batch, so that lime binding and material covering in the non-overhaul chamber 130 can be further reduced, and heat loss brought away by the non-overhaul chamber 130 due to moving material discharging is reduced.
It is noted that in the heat preservation process of the non-overhauling chamber 130, the heat preservation duration is less than or equal to 96 hours, the temperature of the flue gas at the kiln top of the non-overhauling chamber 130 is less than 200 ℃, and the sealing state of the non-overhauling chamber 130 is maintained in other time periods except for short-time inspection of a manhole needing to open a fire hole and an ash discharging mechanism platform.
Step S120: after the overhaul is completed, the overhaul chamber 110 is fed with materials gradually, the non-overhaul chamber 130 is ignited to enter a combustion state, and high-temperature smoke of the non-overhaul chamber 130 is continuously pumped into the overhaul chamber 110 for a preset time period, so that the temperature of a spray gun of the overhaul chamber 110 is increased to a first preset temperature.
It should be noted that in step S120, the range of the preset duration is 5 to 8 hours, and the first preset temperature is 600 degrees celsius, so as to shorten the temperature raising time as much as possible, quickly realize the production again after the maintenance is completed, improve the production again efficiency, and avoid the occurrence of the situations of waste and fuel waste.
It should be noted that, in step S120, only the gas is fed into the non-overhaul chamber 130 within a preset period of time to ensure that the non-overhaul chamber 130 is in a normal combustion state, and in this process, since the temperature of the spray gun of the overhaul chamber 110 is far lower than the first preset temperature, the temperature of safe combustion of the gas cannot be reached, so that the gas cannot be directly fed into the overhaul chamber 110, and safety accidents such as gas poisoning or explosion caused by gas leakage are avoided.
Specifically, step S120 includes two steps, namely:
step S121: after the overhaul is completed, the overhaul chamber 110 is charged to the top of the spray gun box, and the non-overhaul chamber 130 is ignited to enter a combustion state.
In step S121, the overhaul chamber 110 is continuously fed to the top of the lance box, so that the occurrence of low temperature raising efficiency caused by continuous feeding of excessive cold charge is avoided. The covering of the stone material on the top of the spray gun box has three advantages, namely, the height of the material seal is met; secondly, if the preheating zone refractory material is overhauled, the refractory material can be protected from being washed and damaged by stones when the strength of the refractory material is lower; third, the subsequent temperature rise time of the service chamber 110 can be shortened.
Step S122: the high temperature flue gas from the non-service chamber 130 is continuously pumped into the service chamber 110 for a preset period of time to raise the lance temperature of the service chamber 110 to a first preset temperature, and rock material is fed into the service chamber 110 in batches by feeding during reversing until the level gauge has a level display.
It should be noted that, in step S122, the combustion control program of the double-chamber kiln 100 is modified, the maintenance chamber 110 is controlled to enter a heat storage state, the non-maintenance chamber 130 is controlled to enter a combustion state, and the duration is kept for a preset period of time (5 to 8 hours), in this step, high-temperature flue gas generated by combustion in the non-maintenance chamber 130 is continuously pumped to the maintenance chamber 110 through the channel 120 by means of the variable-frequency induced draft fan kiln top exhaust, so as to continuously mix fire and raise the temperature of the maintenance chamber 110 after maintenance is completed.
It is noted that in step S122, the feeding is performed in batches and simultaneously into the service chamber 110 and the non-service chamber 130 during the reversing, so that the level in the service chamber 110 is continuously raised until the level indicator displays the level, and the non-service chamber 130 can be discharged normally. Specifically, the charging mode is adopted during reversing, and the interval duration of two adjacent charging is in the range of 12 minutes to 14 minutes, so that normal production of the non-overhaul chamber 130 is realized while the temperature raising speed of the overhaul chamber 110 is ensured.
In the embodiment, some key process parameters are required to be controlled, the kiln-entering gas quantity is controlled to be 7000 cubic meters/hour to 12000 cubic meters/hour, and the flow direction of the gas and the stone flow direction are in parallel flow heat exchange during the gas combustion; controlling the combustion-supporting air coefficient to be between 1.05 and 1.25, setting the combustion-supporting air coefficient to be lower than the lower limit at the initial stage of kiln opening and temperature rising so as to be beneficial to the temperature rising of the channel 120 after flame elongation and the preheating temperature rising after flame addition; the calcination temperature of the control channel 120 is between 600 ℃ and 950 ℃, the constant-speed temperature rising is carried out at 10 ℃ to 15 ℃ in every preset period, wherein the range of the preset period is 12 minutes to 14 minutes, and the interval duration of the preset period and the adjacent two feeding times is the same, so that the kiln lining refractory is prevented from being damaged due to rapid change of the temperature, and particularly, the expansion damage caused by rapid moisture discharge due to too rapid temperature rising of the preheating zone refractory can be avoided when the preheating zone refractory is overhauled and replaced.
Meanwhile, the lime cooling temperature is controlled to be less than 300 ℃, the cooling air coefficient is between 0.65 and 0.90, cooling air is blown in from the bottom of the kiln, forced cold blowing is carried out on calcined lime, and the cooling temperature is gradually adjusted downwards according to the ash; controlling the residence time of the stone in the kiln chamber to be between 23 and 28 hours; the ash discharge times of the overhaul chamber 110 are controlled to be between 3 and 6 times, and the ash discharge is reduced mainly because the less-moving kiln is not adhered; every 2 hours, the kiln is stopped, the descending state of the stone material level in the overhaul chamber 110 is checked for 1 time, and when the stone is added to the material level in the normal production state (the material level indicator displays the material level), the normal material level indicator is shifted to monitor the change condition of the material level of the stone.
Step S130: the overhauling chamber 110 is ignited to enter a combustion state, and the non-overhauling chamber 130 is controlled to be switched into a heat accumulation state, so that normal alternate reversing production is resumed.
It should be noted that, in step S130, the combustion control procedure of the dual-chamber kiln 100 is modified, and the normal two-chamber alternate direction production mode is restored, i.e. one chamber is in the combustion state while the other chamber is in the heat accumulation state. In this step, the calcination temperature of the control channel 120 is raised to the second preset temperature by 50 to 70 degrees celsius per hour until the normal production state is shifted.
In this embodiment, when the temperature of the channel 120 between the overhaul chamber 110 and the non-overhaul chamber 130 increases to a second preset temperature, the ash discharging efficiency of the overhaul chamber 110 and the non-overhaul chamber 130 is gradually increased to a normal state, wherein the second preset temperature ranges from 950 ℃ to 1050 ℃. Further, in the production process, the ash discharge times of the overhaul chamber 110 are changed from 3 times/batch to 6 times/batch, the steps are changed to 8 times/batch, the times standard before overhaul is restored, so that after the maintenance is carried out for 24 hours to 36 hours, the ash in the yield of the double-chamber kiln 100 can be restored to the state before overhaul, the lime yield is gradually increased from 320 tons/day to 400 tons/day, the normal yield before overhaul is restored, and the requirements of rapid production and quality guarantee are met.
According to the method for quickly reproducing the double-hearth kiln after the maintenance, the maintenance hearth 110 is firstly maintained after the kiln is stopped, and the temperature of the spray gun of the non-maintenance hearth 130 is kept not lower than the first preset temperature; then gradually feeding materials into the overhaul chamber 110 after overhaul is completed, igniting the non-overhaul chamber 130 to enter a combustion state, and continuously pumping high-temperature smoke of the non-overhaul chamber 130 into the overhaul chamber 110 for a preset time period so as to enable the temperature of a spray gun of the overhaul chamber 110 to rise to a first preset temperature; and then the overhaul chamber 110 is ignited to enter a combustion state, and the non-overhaul chamber 130 is controlled to be switched into a heat accumulation state, so that normal alternate reversing production is resumed. Compared with the prior art, the method for quickly producing the double-hearth kiln by heating and raising the temperature after maintenance is adopted, the maintenance hearth 110 is fed with materials gradually after the maintenance is completed, the non-maintenance hearth 130 is ignited to enter a combustion state, and high-temperature flue gas of the non-maintenance hearth 130 is continuously pumped into the maintenance hearth 110 for a preset time period, so that the temperature of a spray gun of the maintenance hearth 110 is raised to a first preset temperature, the production can be quickly realized after the maintenance is completed, the temperature raising time is shortened, the production efficiency is improved, and the situations of waste and fuel waste are avoided.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The method for quickly reproducing the double-hearth kiln after the maintenance of the double-hearth kiln by adding fire and raising the temperature is applied to the double-hearth kiln, and the double-hearth kiln comprises a maintenance hearth and a non-maintenance hearth which are communicated with each other, and is characterized in that the method for quickly reproducing the double-hearth kiln after the maintenance of the double-hearth kiln by adding fire and raising the temperature comprises the following steps:
after stopping the kiln, overhauling the overhauling chamber, and keeping the temperature of the spray gun of the non-overhauling chamber not lower than a first preset temperature, comprising the following steps: after stopping the kiln, controlling the overhaul chamber to discharge ash and discharge the material so as to enable the actual material level to be reduced to a preset material level; reducing the temperature of the overhaul chamber, overhauling the overhaul chamber, and keeping the temperature of a spray gun of the non-overhaul chamber not lower than a first preset temperature, wherein the overhaul chamber is internally fed for 1 to 3 times to lower the temperature of the overhaul chamber, external air is pumped into the overhaul chamber by using a variable-frequency induced draft fan and is discharged outwards through the non-overhaul chamber, and the spray gun box, a preheating zone kiln liner refractory material or the spray gun is overhauled by manually entering the overhaul chamber;
after the overhaul is completed, gradually feeding materials into the overhaul chamber, igniting the non-overhaul chamber to enter a combustion state, and continuously pumping high-temperature smoke of the non-overhaul chamber into the overhaul chamber for a preset time period so as to enable the temperature of a spray gun of the overhaul chamber to rise to the first preset temperature;
and igniting the overhaul chamber to enter a combustion state, and controlling the non-overhaul chamber to be switched into a heat storage state to recover normal alternate reversing production.
2. The method for rapid thermal recovery after hot mix and hot mix maintenance of a double-hearth kiln according to claim 1, wherein the preset duration is in a range of 5 to 8 hours and the first preset temperature is 600 ℃.
3. The method for quick re-production by hot charging and temperature raising after maintenance of a double-hearth kiln according to claim 1, wherein the steps of gradually charging the maintenance hearth after the maintenance is completed, igniting the non-maintenance hearth to enter a combustion state, and continuously pumping high-temperature flue gas of the non-maintenance hearth into the maintenance hearth for a preset period of time so as to enable the temperature of a spray gun of the maintenance hearth to rise to the first preset temperature comprise the following steps:
feeding materials into the overhaul chamber to the top of the spray gun box after overhaul is completed, and igniting the non-overhaul chamber to enter a combustion state;
and continuously pumping the high-temperature flue gas of the non-overhaul chamber into the overhaul chamber within the preset time period so as to enable the temperature of a spray gun of the overhaul chamber to rise to the first preset temperature, and adding stone into the overhaul chamber in batches by adopting a charging mode during reversing until a level gauge has level display.
4. A method for rapid thermal recovery by hot charging after maintenance of a double-hearth kiln according to claim 3, wherein the high temperature flue gas of the non-maintenance hearth is continuously pumped into the maintenance hearth within the preset time period so as to raise the temperature of a spray gun of the maintenance hearth to the first preset temperature, and stone is added to the maintenance hearth in batches by adopting a charging mode during reversing until a level indicator has a level display, and the interval time between two adjacent charging is in the range of 12 minutes to 14 minutes.
5. A method for rapid thermal recovery by hot charging after maintenance of a double-chamber kiln according to claim 3, wherein the high temperature flue gas of the non-maintenance chamber is continuously pumped into the maintenance chamber within the preset time period so as to raise the temperature of a spray gun of the maintenance chamber to the first preset temperature, and stone is added into the maintenance chamber in batches by adopting a charging mode during reversing until a material level indicator is provided, and the range of the kiln charging gas amount is controlled to 7000 cubic meters per hour to 12000 cubic meters per hour, and the range of the combustion-supporting air coefficient is controlled to 1.05 to 1.25.
6. A method of rapid thermal recovery after a double-chamber kiln service according to claim 3, wherein the high temperature flue gas of the non-service chamber is continuously pumped into the service chamber within the preset time period to raise the temperature of the spray gun of the service chamber to the first preset temperature, and stone is added to the service chamber in batches by feeding during reversing until the level indicator displays the level, the channel temperature between the service chamber and the non-service chamber is controlled between 600 ℃ and 950 ℃ and the temperature is raised at a constant speed by 10 ℃ to 15 ℃ every preset period, wherein the preset period is in the range of 12 minutes to 14 minutes.
7. A method for rapid thermal recovery by hot charging after maintenance of a double-chamber kiln according to claim 3, wherein the high temperature flue gas of the non-maintenance chamber is continuously pumped into the maintenance chamber within the preset time period so as to raise the temperature of a spray gun of the maintenance chamber to the first preset temperature, and stone is added into the maintenance chamber in batches by adopting a charging mode during reversing until the level indicator displays the level, wherein the time of the stone in the maintenance chamber is controlled to be 23-28 hours, and the ash discharge frequency of the maintenance chamber is controlled to be 3-6 times.
8. The method for quickly reproducing the double-hearth kiln after the maintenance by changing the fire and raising the temperature according to claim 1, wherein the step of igniting the maintenance hearth to enter a combustion state and controlling the non-maintenance hearth to change into a heat storage state to restore normal alternate reversing production comprises the following steps:
when the temperature of a channel between the overhaul chamber and the non-overhaul chamber is increased to a second preset temperature, gradually increasing ash discharging efficiency of the overhaul chamber and the non-overhaul chamber to a normal state, wherein the second preset temperature ranges from 950 ℃ to 1050 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111443530.XA CN114111346B (en) | 2021-11-30 | 2021-11-30 | Method for quickly reproducing double-hearth kiln after overhauling by adding fire and raising temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111443530.XA CN114111346B (en) | 2021-11-30 | 2021-11-30 | Method for quickly reproducing double-hearth kiln after overhauling by adding fire and raising temperature |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114111346A CN114111346A (en) | 2022-03-01 |
| CN114111346B true CN114111346B (en) | 2023-12-01 |
Family
ID=80368588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111443530.XA Active CN114111346B (en) | 2021-11-30 | 2021-11-30 | Method for quickly reproducing double-hearth kiln after overhauling by adding fire and raising temperature |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114111346B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2083181A (en) * | 1980-09-01 | 1982-03-17 | British Steel Corp | Pre-heating furnace charges |
| JP2003261364A (en) * | 2003-01-31 | 2003-09-16 | Jfe Plant & Service Corp | Vertical firing furnace and firing method |
| CN103030310A (en) * | 2012-07-10 | 2013-04-10 | 内蒙古包钢钢联股份有限公司 | Method for rapidly replacing spray gun in single chamber |
| CN208200764U (en) * | 2018-05-15 | 2018-12-07 | 上海宝冶建设工业炉工程技术有限公司 | Limekiln cooling section cone and cooling system |
| CN111322879A (en) * | 2020-04-07 | 2020-06-23 | 柳州钢铁股份有限公司 | Method for quickly igniting and baking furnace in Maerz kiln |
| 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 |
| CN112146447A (en) * | 2020-09-15 | 2020-12-29 | 广西柳州钢铁集团有限公司 | Method for preventing ash spraying of air release valve of double-chamber kiln |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE309514T1 (en) * | 2000-04-11 | 2005-11-15 | Maerz Ofenbau | METHOD FOR FIRING MATERIAL CONTAINING CARBONATE |
-
2021
- 2021-11-30 CN CN202111443530.XA patent/CN114111346B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2083181A (en) * | 1980-09-01 | 1982-03-17 | British Steel Corp | Pre-heating furnace charges |
| JP2003261364A (en) * | 2003-01-31 | 2003-09-16 | Jfe Plant & Service Corp | Vertical firing furnace and firing method |
| CN103030310A (en) * | 2012-07-10 | 2013-04-10 | 内蒙古包钢钢联股份有限公司 | Method for rapidly replacing spray gun in single chamber |
| CN208200764U (en) * | 2018-05-15 | 2018-12-07 | 上海宝冶建设工业炉工程技术有限公司 | Limekiln cooling section cone and cooling system |
| CN111322879A (en) * | 2020-04-07 | 2020-06-23 | 柳州钢铁股份有限公司 | Method for quickly igniting and baking furnace in Maerz kiln |
| 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 |
| CN112146447A (en) * | 2020-09-15 | 2020-12-29 | 广西柳州钢铁集团有限公司 | Method for preventing ash spraying of air release valve of double-chamber kiln |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114111346A (en) | 2022-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111322879A (en) | Method for quickly igniting and baking furnace in Maerz kiln | |
| US20230175085A1 (en) | Blast furnace operation method | |
| CN108675655A (en) | A kind of lime kiln device using hot wind | |
| KR20090098747A (en) | Device and method for preparing siliceous melts | |
| CN114111346B (en) | Method for quickly reproducing double-hearth kiln after overhauling by adding fire and raising temperature | |
| JP2020002457A (en) | Dl sintering machine and manufacturing method of sintered ore using dl sintering machine | |
| US3658307A (en) | Process and apparatus for melting slag | |
| KR100797360B1 (en) | Blast Furnace Operation Method For Early Securing Steady Operation Temperature | |
| CN214172941U (en) | Gas chamber type heating furnace | |
| CN112325646A (en) | Regenerative heating furnace and heating method using same in oil shale dry distillation process | |
| CN106048115A (en) | Method for furnace top ignition after damping-down of blast furnace | |
| CN111876543A (en) | Improved top combustion type hot blast stove rapid drying optimization method | |
| CN208536608U (en) | A kind of converter furnace lining attemperator | |
| CN114685067B (en) | Rapid and stable cooling and emptying method for double-hearth kiln | |
| CN115418433B (en) | High-temperature furnace drying method for opening new converter | |
| CN112441756B (en) | Online repair method for refractory material of sleeve kiln burner face plate | |
| KR20000014413A (en) | Method for ascending operating degree in mending operation of blast furnace wall | |
| JP5012596B2 (en) | Reduced blast furnace operation method | |
| CN216011733U (en) | Solid waste treatment pre-reduction revolving body for metallurgical waste | |
| Rudzki et al. | Scrap preheating in an electric melt shop | |
| RU2765476C2 (en) | Shaft furnace and oxidizer blowing into it | |
| JP2019059976A (en) | Manufacturing method of sintered ore | |
| JP7135779B2 (en) | Work environment temperature reduction method when repairing a large bell | |
| CN209584013U (en) | Energy-saving active lime terminal calcining kiln | |
| JP2024013311A (en) | Blast furnace operation method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |