From 1993 since put into production, discover phenomenon of hole of occurrence henroost of the firebrick inside kiln for many times in the overhaul or red kiln accident. The surface is smooth and natural, among low, both sides is tall, hatch for a long time like chicken the small hole that leave, the amount differs, those who distributing to be in axial 2~3m in red kiln is circumferential go up, appear every time henroost hole is different also from the distance of kiln mouth, but be in less than of 20m of mouth leaving pit. Hold accident analysis to meet for many times for this, analytic reason, enact measure, obtained certain result. But year this line produces 1500t to transform by day carry after producing solstice to produce 3500t,
Similar case appeared twice again inside a month, after taking step, the problem got settlement. The article makes one analysis to this.
The case study that 1 henroost hole forms
1) inside kiln ventilated not free, top makings is burned forcedly, right now blaze can produce high temperature in the somewhere inside kiln, destroy skin of the place kiln, show firebrick, below the action of high temperature, the exterior bate of firebrick is burned to flow, inside kiln the action of circumgyrate air current falls, surface layer already bate burns drifting firebrick to be swept. Because of the firebrick that be burned all around still kiln skin and heat conduct action, temperature is relatively inferior, and mid temperature is higher, so all around of frit shallow of intermediate frit deep, as it happens accords with the condition that forms henroost hole.
2) raw material composition is flabby, wave motion of value of raw material KH is big, clinker
The value is in 0.95 wave motion of 0.85 ～ . When KH value is exorbitant, stock is burned hard, the grog that qualification gives to burn on the operation carries blaze to calcine on the head, make local form high temperature; When the cost is too low, if did not take the step that reduce coal in time, can cause high temperature, attaint kiln skin, ablation is firing take a brick.
3) character of raw coal combustion is bad. My company raw coal grows with Shanxi treat soft coal, because a variety of reasons enter coal from many mine dot, arrive next inside the factory match according to the scale requisition of laboratory make known to lower levels again. The coal after sophisticate is good volatilizes cent is 12% the left and right sides, fineness control sifts ≤4% of residue on sieve in 80μm, because do not have coal leveling storage yard, after been match by forklift mix into, send former bunker reentry to grind through leather belt, such coal fines composition is not stable, enter someplace of the meeting inside kiln to center combustion, cause local temperature exorbitant, attaint kiln skin.
4) burner adjustment is undeserved. Gap of the wind inside the burner that the company uses is too big, cause high temperature to nod reach, blaze weak point is thick, heating power too concentration, wind bag does not stay in fire outside, sweep kiln skin, cause kiln brick to burn out.
5) kiln head is being pressed big. When ability changes, because kiln head discharges fan, report to remove dust,the system is installed according to the product line of 2500t/d, did not alter again for be economical. After crop increases, fan of kiln head platoon and report remove dust systematic capacity is insufficient, cause kiln head to often be in controlling state. Kiln head is being pressed make blaze is out of shape easily, erode then firebrick, bring about burn stream, form henroost hole phenomenon.
2 precautionary measures
1) if discover kiln inside ventilated not free, check processing. If system of kiln end intake air heater is caused, shrink to room of kiln end smoke mouth and brae place undertake clearing; If the knot inside kiln is encircled, reduction of output burns a circle; If be caused by of kiln end air leak, shot-off of loss; The influence is produced or switch on the mobile phone when mishandle, stop kiln processing, assure kiln inside ventilated and smooth, avoid the harm to firebrick.
2) control takes factory raw material, stabilize raw material composition, use warehouse of old line leveling, lengthen leveling time to improve leveling result, control cost of raw material KH in 0.91 -0.02, those who assure raw material is easy the moderate that burn a gender.
3) raw coal is purchased should accomplish mine dot to secure, the calorific value stability that assures coal, reserve stability and combustion character are stable, the coal without leveling is forbidden use.
4) control burner fixed position in slant makings 0~20mm less than; If need
When adjusting, also should make sure burner center line and kiln are lower point of intersection is after kiln; The degree of finish of blaze, accident is adjusted, can adjust according to combustion circumstance, allow with sweeping kiln skin to be.
5) when the end of the year heavies repair, in comb with a double-edged fine-toothed comb cold machine coping raises 6 sprinkler head, installation is in 3 rooms upper part, to do not add equipment, in add exit of wet tower water pump to increase one valve, derivative cold machine of comb with a double-edged fine-toothed comb of connection of a hose water injection system, drop clinker temperature, reduce cold chance of comb with a double-edged fine-toothed comb wind force of the cold aircraft that carry wind; In comb with a double-edged fine-toothed comb cold machine exit and join of electric dust catcher are in charge of place intermediate to increase one expansion chamber, reduce the dust that enters electric dust catcher, raise electric dust catcher to receive dirt result, ensure kiln head negative pressure is stable.
6) in accuse hour of personnel of personnel, check of make one's rounds to pay close attention to cylindrical shell temperature, once discover temperature rise of kiln skin canister is fast, the report is in charge of a leader, the analysis proves a cause, adopt drop in temperature measure. The reduction of output when wanting moves, even stop production processing, prevent red kiln accident.
7) stabilize wind 2 times lukewarm, its control is in (1150 -50) ℃ less than, avoid big cases to fall greatly, because blaze does not stabilize attaint kiln skin.
8) assure to cast makings stability, if encounter intake air heater to collapse,expect, want to reduce makings production, when wanting, can stop expect a makings burn-up, return to normal again production.
3 last words
In process of clinker to calcine, because system or factitious operation reason cause kiln skin to injure, the harm is very great, often cause an accident to stop kiln, bring pecuniary loss to the enterprise. Especially after hole of kiln brick occurrence henroost, cause local red kiln, must stop kiln filling brick or change a brick, affect enterprise beneficial result badly, after taking above step, similar without reappear phenomenon. Zhengzhou flourish fills fireproof material to regard manufacturer of the adventitious of high quality fireproof material as the home, have rich manufacturing experience and practice base, stand in the forward position that the industry expands from beginning to end, pay attention to innovation of science and technology, increase the development strength to new product ceaselessly, in ensuring flourish fills material to be able to apply to more furnace kiln projects, bring good news for more projects.
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