CN102311237B

CN102311237B - Method for repairing mechanical shaft kiln lining

Info

Publication number: CN102311237B
Application number: CN 201110149256
Authority: CN
Inventors: 王敏
Original assignee: Taiyuan Iron and Steel Group Co Ltd
Current assignee: Taiyuan Iron and Steel Group Co Ltd
Priority date: 2011-06-03
Filing date: 2011-06-03
Publication date: 2013-02-27
Anticipated expiration: 2031-06-03
Also published as: CN102311237A

Abstract

The invention discloses a method for repairing a mechanical shaft kiln lining, belonging to the maintenance field of a lime production kiln. The method comprises the following steps: 1. washing a furnace: cleaning a furnace wall with high-pressure water by a high-pressure nozzle driven by a spraying mechanical arm from bottom to top firstly and then from top to bottom; 2. examining for spraying: thoroughly cleaning nodules and residues off from the inner wall of the furnace, cleaning loose floating bricks out of the furnace, digging and repairing seriously collapsing positions in the furnace, installing stainless steel anchorages on a working layer in the furnace, hanging a net, welding a longer anchorage, and hanging a net for spraying; and 3. spraying: integrally spraying the whole lining in a large area and spraying local areas with specific targets to obtain an intact furnace profile. The method has the advantages of short construction period, low cost and good effect.

Description

A kind of restorative procedure of mechanical shaft kiln lining

Technical field

The invention belongs to the maintenance in production limestone kiln, be specifically related to a kind of restorative procedure of mechanical shaft kiln lining.

Background technology

[0002] mechanical shaft kiln is produced lime, light dolomite in the metallurgical building material industry widespread use of China, but since mechanical shaft kiln be subjected to for a long time high temperature erosion, material wash away and lime, rhombspar in the impact of impurity generation chemical reaction, generally speaking, mechanical shaft kiln lining will produce damage in various degree about 4 years, such as coming off of the peeling off of fire-resistant working lining, refractory brick etc., must stop production and normally to produce after repairing.The mechanical shaft kiln lining restorative procedure is that the refractory brick complete removal that damages is heavily built, and the method construction period is long, expensive large.

Summary of the invention

The invention provides the restorative procedure of short, expensive little a kind of mechanical shaft kiln lining of construction period.

The present invention adopts the mechanical manipulator automatic spraying, it is characterized in that comprising the steps:

1, prepurging, even with the high pressure water of hydraulic pressure 〉=40MPa, flow is 1m ³/ h cleans furnace wall, first from bottom to top, after from top to bottom furnace wall is cleaned, with slag crust, loosening refractory brick, floating dust etc. clean up;

2, spraying early-stage preparations are namely cleaned out stove inwall dross, residue, to float block cleaning loose in the stove, the serious position that subsides in the stove are mended by replacing a damaged part, and working lining is installed the installation of stainless steel anchoring piece, linked network in the stove; Weld longer anchoring piece, linked network in order to spraying;

3, Corundum Mullite Refractory spraying, namely full liner big area globality spraying localized region sprays targetedly, obtains the intact type of furnace.

Described spray material is Corundum Mullite Refractory, Corundum Mullite Refractory Al ₂O ₃Content is greater than 60 %; Fe ₂O ₃Content is less than 3%, SiO ₂Content is less than 30%.

Construction period of the present invention is short, to the 500m of matrix material factory of Taiyuan Iron ﹠ Steel Group Co., Ltd. ³In the reparation of mechanical shaft kiln, from stop production to overhaul to resuming production, reach product, amount to 8 days, this is very fast in the service work of big machinery shaft furnace.And this kiln damage intensity is serious, and the liner many places are loosening, for guaranteeing repairing effect, has carried out integral spray, sprays thick position and reaches 464cm, and the thinnest local 5cm uses 276.41 tons of spray materials, rebound materials 18%.

It is the first trial of repairing liner work as spray material that the present invention adopts corundum-mullite, corundum-mullite refractory temperature high (1500 ℃～1750 ℃), the characteristics such as good thermal shock stability (anti-acute degeneration), refractoriness under load is high, creep properties is low, the anti-slag permeability resistance is good, product stability is strong, in the metallurgy industry widespread use, it is the preferred material of blast furnace spraying, under the blast furnace severe environment, brought into play good effect.

Facts have proved that the kiln liner internal diameter of reparation of the present invention has reached 5m ± 5cm, smooth surface, densification, cracking not do not have interlayer, honeycomb, hole.During the baker heating-up furnace, do not have cracking come off problem, particularly thin position (＜5cm).

After kiln lining was repaired in spray repair, windage obviously reduced, and kiln body internal temperature is balanced, and coke ratio reduces, and calcined effectively, and light dolomite finished product rate obviously improves, and the 300S cycle can be produced more than 420 ton of light dolomite, and output obtains increasing by 5%.

Embodiment:

Embodiment:Present embodiment is to the 500m of matrix material factory of Taiyuan Iron ﹠ Steel Group Co., Ltd. ³Mechanical shaft kiln sprays reparation,

The major equipment that present embodiment uses is 2 in main injection machine, discharging threeway 2 (a preparation and a use), minute 1 of gas bag, 1 in work box, 1 of high pressure washer, spray repair mechanical manipulator 2 (a preparation and a use), 1 of Hydraulic Station, pumping plant 1 (containing water dispensing apparatus), 1 of power distribution cabinet, 2 of tool chests, 1 in crane and material pipe, airduct, cable.

The implementation step is as follows:

1, use the high pressure water of hydraulic pressure 〉=40MPa, flow is 1m ³/ h cleans furnace wall by spray coating mechanical hand transmission high pressure spray nozzle, first from bottom to top, after from top to bottom furnace wall is cleaned 3 times, the spray repair mechanical manipulator is set 3 rev/mins, revolution 1 circle rises 200mm with slag crust, become flexible refractory brick, floating dust etc. clean up, 60～120 minutes times spent.

2, stove inwall dross, residue are cleaned out, float block loose in the stove is cleared up, assurance can not have light dolomite and resistates to affect the bonding properties of spray material;

3, the serious position that subsides in the stove is mended by replacing a damaged part, build alumina firebrick by laying bricks or stones, fire resistant heat preserving is recovered layer by layer substantially;

4, working lining is installed the installation of stainless steel anchoring piece, linked network in the stove; Weld longer anchoring piece, linked network in order to spraying.

5, according to the difference of the former erosion degree of inner lining of furnace, main injection machine ejection Corundum Mullite Refractory is controlled at 120～140 kg/minute, and this stage is the material spray in early stage, and the material spray amount is 80% of Corundum Mullite Refractory total amount.

6, the spray repair mechanical manipulator was with the 40 seconds/rotating speed that turns, the spray repair mechanical manipulator is in spraying process, set 40 seconds/rotating speed that turns carries out, thickness reaches 50cm, lifting 300mm, successively spraying is until reach the purpose that fire-resistant working lining is repaired, so carry out full liner big area globality spraying and localized region and spray targetedly, obtain the intact type of furnace.

The leading indicator of spray material among the embodiment (Corundum Mullite Refractory) (check of refractory products supervision and inspection station, Shanxi Province): Al ₂O ₃Content is greater than 60 %; Fe ₂O ₃Content is less than 3%, SiO ₂Content is less than 30%, and compressive strength is 24.6 MPa at 1200 ℃ * 3h, and folding strength is 16.4 MPa at 1350 ℃ * 3h, and the line velocity of variation is-0.3% at 1000 ℃ * 3h%, and volume density is 2.15 g/cm 110 ℃ * 24/2 ³, the 0.2Mpa refractoriness under load is at 0.2MPa, and 4.0% is 1393 ℃.

Claims

1. the restorative procedure of a mechanical shaft kiln lining adopts the mechanical manipulator automatic spraying, it is characterized in that comprising the steps:

(1),Prepurging, even with the high pressure water of hydraulic pressure 〉=40MPa, flow is 1m ³/ h cleans furnace wall, first from bottom to top, after from top to bottom furnace wall is cleaned, with slag crust, loosening refractory brick, floating dust etc. clean up;

(2), the spraying early-stage preparations, namely stove inwall dross, residue are cleaned out, to the cleaning of float block loose in the stove, the serious position that subsides in the stove is mended by replacing a damaged part, working lining installs that the stainless steel anchoring piece is installed, linked network in the stove; Weld longer anchoring piece, linked network in order to spraying;

(3), spray material spraying, i.e. full liner big area globality spraying, localized region sprays targetedly, obtains the intact type of furnace.

2. the restorative procedure of a kind of mechanical shaft kiln lining according to claim 1 is characterized in that described spray material is Corundum Mullite Refractory, Corundum Mullite Refractory Al ₂O ₃Content is greater than 60 %; Fe ₂O ₃Content is less than 3%, SiO ₂Content is less than 30%.