CN109341354B - Construction method of rotary cement kiln mouth castable - Google Patents

Construction method of rotary cement kiln mouth castable Download PDF

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Publication number
CN109341354B
CN109341354B CN201811035786.5A CN201811035786A CN109341354B CN 109341354 B CN109341354 B CN 109341354B CN 201811035786 A CN201811035786 A CN 201811035786A CN 109341354 B CN109341354 B CN 109341354B
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pouring
construction
block
casting
kiln
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CN109341354A (en
Inventor
马明亮
薛维杰
叶海东
苏纲
王博
刘爽
杨恒杰
张春霞
杨晓光
吕泽文
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Beijing Triumph International Engineering Co ltd
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Beijing Triumph International Engineering Co ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00Casings; Linings; Walls; Roofs
    • F27D1/16Making or repairing linings increasing the durability of linings or breaking away linings
    • F27D1/1626Making linings by compacting a refractory mass in the space defined by a backing mould or pattern and the furnace wall

Abstract

The invention provides a rotary cement kiln mouth castable construction method, which belongs to the technical field of cement production line construction. The invention is convenient for the arrangement of the expansion joint in the construction process by twice spacer block construction, can ensure the even arrangement of the expansion joint, and can not generate the phenomenon of large-area damage or falling off of the casting material; in the secondary spacer block construction process, side panels are not required to be arranged on two sides of the pouring block, so that construction materials are saved, operation is simplified, and working efficiency is improved; in the construction process, the top is not provided with a plate, the operation space of the vibrating rod is ensured, the castable is vibrated uniformly, the gas in the castable can be discharged, the construction quality of the castable is ensured, and the service life of the pouring part of the kiln opening is prolonged.

Description

Construction method of rotary cement kiln mouth castable
Technical Field
The invention belongs to the technical field of cement production line construction, and particularly relates to a rotary cement kiln mouth castable construction method.
Background
The rotary kiln is the heart of a dry cement production line. The castable at the kiln opening of the rotary kiln is easier to damage relative to other parts of the cement kiln, cement clinker is in a burning zone stage, the cement clinker is changed into particles from a liquid phase, the abrasion performance is strong, the kiln opening is positioned at the front end of the coal injection pipe, the temperature is high, the working environment of the castable at the kiln opening is severe, and therefore the service life of the castable at the kiln opening greatly influences the operation rate of the cement kiln.
The traditional construction method of the rotary kiln mouth castable is generally used for sequentially constructing in the rotary kiln process, the kiln mouth castable is poured at one time, and in the construction process, ceramic fiber boards or ceramic fiber cotton are easily washed away by the castable, so that an expansion joint is unreasonably arranged, and the service life is influenced; meanwhile, the castable is easy to fall off in a large area in the using process.
The invention application publication No. CN 106595315A provides a construction method of rotary cement kiln mouth castable, which comprises the steps of fixing a side template, attaching an aluminum silicate fiber felt or a three-ply board for expansion joints to the inner side of the side template, rotating the kiln to an adjacent un-constructed part after the construction is finished, removing the side template which has the partition and blocking effect at the constructed part and only leaving the expansion joints, installing the side template at the other side of the kiln mouth iron protector at the six o' clock position, attaching the expansion joints to the inner side of the template, and repeating the steps in sequence until the whole ring construction of the kiln mouth is finished.
In the construction process, the method is sequentially constructed in sequence, and has the following defects:
(1) when a mold is supported, the expansion joint is attached to the inner side of the side mold plate, if an aluminum silicate fiber felt is adopted, the expansion joint is easily washed away by the casting material in the casting process, and the arrangement of the expansion joint is uneven; if the three-ply board is adopted, in the production and operation process, gaps are left after the three-ply board is burnt at high temperature, and after high-temperature gas enters, the kiln opening of the rotary kiln is easily damaged.
(2) And the side templates need to be dismantled and then the construction of the adjacent kiln mouth iron protectors is carried out. Therefore, the side templates need to be removed after the castable is solidified, the time utilization rate is low, and the construction period is prolonged.
(3) Only expansion joints are left when the sideforms are removed. In the process of dismantling the side templates, the expansion joint material attached to the inner side is easily torn off, so that the expansion joint is not successfully arranged.
Disclosure of Invention
The invention aims to solve the problems and provides a construction method of rotary cement kiln mouth castable, which comprises the steps of dividing a plurality of pouring blocks according to the number of iron protection blocks at the rotary cement kiln mouth, pouring the rotary cement kiln mouth castable twice through partition blocks, and arranging expansion joints in the construction process.
The above object of the present invention is achieved by the following technical solutions:
a construction method of a rotary cement kiln inlet castable comprises the following steps of dividing a plurality of pouring blocks according to the number of blocks of a back iron (4) at a rotary cement kiln inlet (3), respectively identifying all the pouring blocks as two different numbers, namely a first pouring block and a second pouring block which are arranged at intervals, and pouring twice through two partition blocks to finish the construction of the rotary cement kiln inlet castable, and comprises the following steps:
step one, installing a pouring template: turning a back iron (4) corresponding to a pouring block with the number one to the bottom starting point, installing an end panel (6) at the end surface of the back iron (4), and installing side panels (7) at the two sides of the back iron (4) respectively to form a pouring template;
step two, pouring construction: conveying the casting material to a casting template of a part to be constructed, discharging gas in the casting material, and troweling the surface of the construction part to form a first casting block numbered as one;
step three: primary spacer block construction: a1, rotating the rotary kiln, rotating the back iron (4) corresponding to the first pouring block adjacent to the first pouring block with the serial number of the first pouring block to the starting point of the bottom of the kiln opening (3) of the rotary kiln, and repeating the steps from the first step to the second step to obtain a second pouring block with the serial number of the first pouring block; b1, repeating the operation A1 until all the pouring blocks numbered as the first pouring block are constructed; c1, maintaining the poured part for 24 hours or removing the side panel (7) of the poured pouring block until the strength of the pouring material reaches 90% of the required strength;
step four, pouring blocks with different numbers in the step: rotating a casting block corresponding to a casting block numbered as the second number to the starting point of the bottom of a kiln opening (3) of the rotary kiln, respectively sticking a high-temperature resistant ceramic fiber plate or a ceramic fiber felt to the side surface part of the casting block adjacent to the first casting block on two sides of the casting block, and installing an end surface plate (6) on the end surface of the casting block (4) of the part to be constructed; then repeating the step two to carry out pouring construction to obtain a first pouring block numbered as a second number;
step five, secondary spacer block construction: a2, rotating the rotary kiln, rotating the back iron (4) corresponding to the second pouring block adjacent to the first pouring block with the serial number of the second pouring block to the starting point of the bottom of the kiln opening (3) of the rotary kiln, and repeating the step four to obtain the second pouring block with the serial number of the second pouring block; b2, repeating the operation A2 until all the pouring blocks numbered as No. two are constructed; and C2, after the poured pouring blocks are maintained for 24 hours or the strength reaches 90% of the required strength, the end panel (6) of each pouring block is removed.
In the construction method of the rotary cement kiln opening castable, in the fourth step, the thickness value of the ceramic fiber plate or the ceramic fiber felt is two times of the preset expansion gap width value between adjacent pouring blocks.
In the construction method of the rotary cement kiln opening castable, the thickness value of the ceramic fiber plate or the ceramic fiber felt is 5 mm.
In the construction method of the rotary cement kiln mouth castable, the step two further comprises the following steps:
and fully vibrating the casting material at the construction part by using a vibrating spear to discharge gas in the casting material.
In the construction method of the rotary cement kiln inlet castable, the iron protectors (4) are fixed on the rotary cement kiln inlet (3) through bolts, and gaps are reserved between adjacent iron protectors (4).
In the construction method of the rotary cement kiln mouth castable, each iron protector (4) is welded with an anchoring piece (5), and the anchoring piece (5) does not cross a gap between the iron protector (4) where the anchoring piece is located and the adjacent iron protector (4).
In the construction method of the rotary cement kiln opening castable, the gap width value between adjacent back iron (4) is equal to the preset expansion gap width value between adjacent pouring blocks.
By adopting the technical scheme, the invention has the technical effects that:
(1) according to the invention, a plurality of pouring blocks are divided according to the number of the iron protection blocks at the kiln opening of the rotary kiln, and the construction of the castable at the kiln opening of the rotary cement kiln is completed through twice spacer block construction, so that the arrangement of an expansion joint in the construction process is convenient, the uniform arrangement of the expansion joint can be ensured, and the phenomenon of large-area damage or falling off of the castable can be avoided;
(2) in the secondary spacer block construction process, side panels are not required to be arranged on two sides of the pouring block, so that construction materials are saved, operation is simplified, and working efficiency is improved;
(3) after the construction is finished, the ceramic fiber board or the ceramic fiber felt arranged at the expansion joint is not removed and is kept at the expansion joint, and because the ceramic fiber board or the ceramic fiber felt has higher compressibility and higher high temperature resistance, the thickness of the ceramic fiber board or the ceramic fiber felt is set to be about twice of the width of the preset expansion joint, so that the effectiveness of the arranged expansion joint is ensured, and the naked kiln mouth pouring block part at the expansion joint can be prevented from being invaded by high-temperature gas;
(4) in the construction process, the top is not provided with a plate, so that the operation space of the vibrating spear in the pouring process can be ensured, the castable can be vibrated uniformly, the gas in the castable can be discharged in the vibrating process, the phenomena of air holes and the like are prevented, the construction quality of the castable is ensured, and the service life of the pouring part of the kiln opening is prolonged.
Drawings
FIG. 1 is a schematic view of the construction of a rotary kiln opening with an installed back iron in the method of the present invention;
FIG. 2 is a schematic view of the numbers of the pouring blocks divided by the method of the present invention;
FIG. 3 is a schematic view of the installation of side and end panels of a casting block in the method of the present invention;
FIG. 4 is a schematic structural view of a pouring block after one-time partition block construction is completed in the method of the present invention;
FIG. 5 is a schematic structural diagram of a pouring block in the method of the present invention after the construction of the secondary spacer block is completed.
The main labels are as follows:
1: pour piece No. one (the serial number is the piece of pouring of a), 2: no. two pour the piece (the serial number is the piece of pouring of No. two), 3: kiln mouth of rotary kiln, 4: iron protection, 5: anchor, 6: end panel, 7: and a side panel.
Detailed Description
The invention provides a construction method of a kiln opening pouring material of a cement rotary kiln, which aims to solve the problems that the existing construction method of the kiln opening pouring material of the rotary kiln usually adopts a sequential construction mode, the pouring of the kiln opening pouring material is finished at one time, the construction method is easy to cause the problems of uneven expansion joints, falling of the pouring material, damage to the kiln opening, low construction efficiency and the like.
The construction method of the rotary cement kiln inlet pouring material of the invention is explained in detail below with reference to the accompanying drawings and specific examples.
As shown in fig. 1, a plurality of back iron pieces 4 are arranged at a kiln mouth 3 of a rotary cement kiln before pouring, the back iron pieces 4 are fixed on the kiln mouth 3 of the rotary cement kiln through bolts, a gap is reserved between adjacent back iron pieces 4 and used for installing a side panel 7 (refer to fig. 3) during pouring, and preferably, the size of the gap is equivalent to the width of a preset expansion gap between adjacent pouring blocks; each back iron 4 is welded with an anchoring part 5, so that the anchoring part 5 does not cross the gap between the back iron 4 where the anchoring part is located and the adjacent back iron 4 in order to facilitate pouring construction. As shown in fig. 2, according to the invention, a plurality of pouring blocks are divided according to the number of the back iron 4 installed at the kiln opening 3 of the rotary kiln, all the pouring blocks are marked as two different numbers, namely a first pouring block and a second pouring block, and the pouring blocks with different numbers are arranged at intervals, namely a first pouring block 1 and a second pouring block 2 are arranged at intervals.
Referring to fig. 1 to 5, the invention provides a construction method of a rotary cement kiln mouth pouring material based on the divided pouring blocks, and the method comprises the following steps:
step one, installing a pouring template: turning the casting iron 4 corresponding to the casting block numbered as the first number to the starting point of the bottom, and cleaning dust, impurities, residual welding slag and the like at the part to be constructed when the anchoring piece 5 is welded; an end face plate 6 is arranged at the end face position of the back iron 4, side face plates 7 are arranged at the two sides of the back iron 4, a pouring template is formed, the pouring template is required to be firmly installed, and no gap is formed to prevent slurry leakage.
Step two, pouring construction:
firstly, stirring the casting material by adopting a forced stirrer, wherein the interior of the forced stirrer is required to be clean and free of silt, other casting materials with different brands, other impurities and the like; the stirring time of the casting material, the quality of water addition, the water addition amount and the like strictly follow the use requirements of the selected casting material;
secondly, the stirred castable is quickly conveyed into a pouring template at a part to be constructed, the castable at the construction part is sufficiently vibrated by a vibrating rod, and a plate is not added at the top of the construction part in the construction process, so that the operation space of the vibrating rod in the pouring process is ensured, the pouring vibration is uniform, the gas in the castable can be discharged, the phenomena of gas holes and the like are prevented, and the construction quality of the castable is ensured;
and finally, carrying out floating treatment on the surface of the construction part to obtain a first pouring block numbered as I.
Step three, one-time spacer block construction: a1, rotating the rotary kiln, rotating the back iron 4 corresponding to the first pouring block adjacent to the first pouring block with the serial number of the first pouring block to the starting point of the bottom of the kiln opening 3 of the rotary kiln, and repeating the steps from the first step to the second step to obtain a second pouring block with the serial number of the first pouring block; b1, repeating the operation A1 until all the pouring blocks numbered as the first pouring block are constructed; and C1, curing the poured part for 24 hours or removing the side panel 7 of the poured pouring block after the strength of the pouring material reaches 90% of the required strength (see figure 4).
Step four, pouring blocks with different numbers in the step: referring to fig. 5, rotating a back iron 4 corresponding to a pouring block with the number of two to the starting point of the bottom of a kiln opening 3 of the rotary kiln, and respectively sticking a high-temperature resistant ceramic fiberboard or a ceramic fiber felt on the side part of the first pouring block adjacent to the two sides of the pouring block; cleaning dust and impurities at the part to be constructed, residual welding slag and the like when the anchoring piece 5 is welded, and installing an end panel 6 on the end face of the back iron 4 corresponding to the part to be constructed to form a pouring template which is required to be firm and cannot have a gap to prevent slurry leakage; according to the temperature and material property of the casting block, the expansion gap is generally set to be 2mm-3mm, the ceramic fiber board or the ceramic fiber felt has a certain compression ratio, and the preferred thickness is 5 mm.
Because the pouring block part after pouring is maintained for 24 hours or the strength of the pouring material reaches 90% of the required strength, the ceramic fiber board or the ceramic fiber felt can be tightly and smoothly attached, and the side panels 7 are not required to be arranged on the two sides, so that the ceramic fiber board or the ceramic fiber cotton can be prevented from being washed away by the pouring material in the pouring process.
And then repeating the step two to carry out pouring construction to form a first pouring block with the serial number of second.
Step five, secondary spacer block construction: a2, rotating the rotary kiln, rotating the back iron 4 corresponding to the other second pouring block adjacent to the first pouring block with the serial number of the second pouring block to the starting point of the bottom of the kiln opening 3 of the rotary kiln, and repeating the step four to obtain the second pouring block with the serial number of the second pouring block; b2, repeating the operation A2 until all the pouring blocks numbered as No. two are constructed; and C2, after the poured pouring blocks are maintained for 24 hours or the strength reaches 90% of the required strength, the end panel 6 of each pouring block is removed, and water spraying maintenance can be carried out at random as required.
The construction method of the rotary cement kiln mouth pouring material has reasonable and flexible construction procedures, for example, in the construction process of the primary separation block in the step two, after the poured part is maintained for 24 hours or the strength of the pouring material reaches 90% of the required strength, the side panel 7 of the poured primary pouring block 1 can be removed, or the side panel 7 can be removed again in the construction process of the secondary separation block in the step five; in the fourth step and the fifth step, as the ceramic fiber board or the ceramic fiber felt has larger compressibility and stronger high temperature resistance, and the thickness of the ceramic fiber board or the ceramic fiber felt is set to be about twice of the width of the preset expansion joint, the effectiveness of the set expansion joint is ensured, and the naked kiln mouth pouring block part at the expansion joint can be prevented from being invaded by high-temperature gas.
The construction method of the invention divides a plurality of pouring blocks according to the number of 4 pieces of back iron at the kiln mouth of the rotary kiln, and completes the pouring of the pouring blocks through twice spacer block construction, thereby facilitating the arrangement of expansion joints in the construction process, ensuring the uniform arrangement of the expansion joints and avoiding the phenomenon of large-area damage or falling off of the pouring material; in the construction process of the secondary spacer blocks, side panels are not required to be arranged, so that template materials are saved, the construction operation is simplified, and the working efficiency is improved; after the construction is finished, the ceramic fiber board or the ceramic fiber felt arranged at the expansion joint is not removed and is kept at the expansion joint, and because the ceramic fiber board or the ceramic fiber felt has higher compressibility and higher high temperature resistance, the thickness of the ceramic fiber board or the ceramic fiber felt is set to be about twice of the width of the preset expansion joint, so that the effectiveness of the arranged expansion joint is ensured, and the naked kiln mouth pouring block part at the expansion joint can be prevented from being invaded by high-temperature gas; in the construction process, the top is not provided with a plate, so that the operation space of the vibrating spear in the pouring process can be ensured, the castable can be vibrated uniformly, the gas in the castable can be discharged in the vibrating process, the phenomena of air holes and the like are prevented, the construction quality of the castable is ensured, and the service life of the pouring part of the kiln opening is prolonged.
It will be understood by those skilled in the art that these examples or embodiments are for illustrative purposes only and are not intended to limit the invention, and that various equivalent modifications and changes may be made to the invention within the scope of the present disclosure.

Claims (7)

1. The construction method of the rotary cement kiln inlet castable is characterized in that a plurality of pouring blocks are divided according to the number of the iron protectors (4) at the rotary cement kiln inlet (3), all the pouring blocks are respectively marked with two different numbers, namely a first pouring block and a second pouring block which are arranged at intervals, and the rotary cement kiln inlet castable construction is completed through twice pouring of the spacing blocks, and comprises the following steps:
step one, installing a pouring template: turning a back iron (4) corresponding to a pouring block with the number one to the bottom starting point, installing an end panel (6) at the end surface of the back iron (4), and installing side panels (7) at the two sides of the back iron (4) respectively to form a pouring template;
step two, pouring construction: conveying the casting material to a casting template of a part to be constructed, discharging gas in the casting material, and troweling the surface of the construction part to form a first casting block numbered as one;
step three: primary spacer block construction: a1, rotating the rotary kiln, rotating the back iron (4) corresponding to the first pouring block adjacent to the first pouring block with the serial number of the first pouring block to the starting point of the bottom of the kiln opening (3) of the rotary kiln, and repeating the steps from the first step to the second step to obtain a second pouring block with the serial number of the first pouring block; b1, repeating the operation A1 until all the pouring blocks numbered as the first pouring block are constructed; c1, maintaining the poured part for 24 hours or removing the side panel (7) of the poured pouring block until the strength of the pouring material reaches 90% of the required strength;
step four, pouring blocks with different numbers in the step: rotating a casting block corresponding to a casting block numbered as the second number to the starting point of the bottom of a kiln opening (3) of the rotary kiln, respectively sticking a high-temperature resistant ceramic fiber plate or a ceramic fiber felt to the side surface part of the casting block adjacent to the first casting block on two sides of the casting block, and installing an end surface plate (6) on the end surface of the casting block (4) of the part to be constructed; then repeating the step two to carry out pouring construction to obtain a first pouring block numbered as a second number;
step five, secondary spacer block construction: a2, rotating the rotary kiln, rotating the back iron (4) corresponding to the second pouring block adjacent to the first pouring block with the serial number of the second pouring block to the starting point of the bottom of the kiln opening (3) of the rotary kiln, and repeating the step four to obtain the second pouring block with the serial number of the second pouring block; b2, repeating the operation A2 until all the pouring blocks numbered as No. two are constructed; and C2, after the poured pouring blocks are maintained for 24 hours or the strength reaches 90% of the required strength, the end panel (6) of each pouring block is removed.
2. The rotary cement kiln mouth castable construction method according to claim 1, characterized in that in the fourth step, the thickness value of the ceramic fiber plate or the ceramic fiber felt is twice as large as the preset expansion joint width value between adjacent casting blocks.
3. The rotary cement kiln mouth castable construction method according to claim 2, characterized in that the thickness value of the ceramic fiber plate or the ceramic fiber felt is 5 mm.
4. The construction method of the rotary cement kiln mouth castable according to any one of claims 1 to 3, characterized in that in the second step, the method further comprises the following steps:
and fully vibrating the casting material at the construction part by using a vibrating spear to discharge gas in the casting material.
5. The construction method of the rotary cement kiln mouth castable according to claim 1, characterized in that the back iron (4) is fixed on the rotary cement kiln mouth (3) through bolts, and gaps are reserved between adjacent back irons (4).
6. The rotary cement kiln mouth castable construction method according to claim 5, characterized in that an anchoring piece (5) is welded on each back iron (4), and the anchoring piece (5) does not cross a gap between the back iron (4) where the anchoring piece is located and the adjacent back iron (4).
7. The rotary cement kiln mouth castable construction method according to claim 5, characterized in that the gap width value between adjacent back irons (4) is equal to the preset expansion gap width value between adjacent casting blocks.
CN201811035786.5A 2018-09-06 2018-09-06 Construction method of rotary cement kiln mouth castable Active CN109341354B (en)

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DE3327851C2 (en) * 1983-08-02 1987-04-23 Karrena Gmbh, 4000 Duesseldorf, De
CN201281546Y (en) * 2008-09-23 2009-07-29 中冶天工建设有限公司 Fire resistant material pouring mold for rotary kiln
CN106595315B (en) * 2016-12-10 2018-08-31 通达耐火技术股份有限公司 A kind of rotary cement kiln eye castable construction method
CN106595314A (en) * 2016-12-15 2017-04-26 攀枝花钢城集团有限公司 Rotary kiln liner structure and laying method
CN106679427A (en) * 2016-12-29 2017-05-17 安徽芜湖海螺建筑安装工程有限责任公司 Construction method for refractory material of kiln opening of rotary cement kiln

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