CN101580395A

CN101580395A - Refractory material for dry quenching

Info

Publication number: CN101580395A
Application number: CNA2009100329944A
Authority: CN
Inventors: 钱志明; 岳振国
Original assignee: Nuoming High-Temperature Refractory Material Co Ltd Yixing
Current assignee: Jiangsu Nuoming High Temperture Materials Co., Ltd.
Priority date: 2009-06-10
Filing date: 2009-06-10
Publication date: 2009-11-18
Anticipated expiration: 2029-06-10
Also published as: CN101580395B

Abstract

The invention discloses a novel refractory material for dry quenching, which comprises the following components in percentage by weight: 35 to 50 percent of SiC, 20 to 35 percent of beta-SiC, 0.05 to 1.0 percent of Fe2O3, and 5 to 15 percent of Al2O3. The refractory material for dry quenching has the advantages of high compressive strength, good abrasion resistance, good thermal shock performance, and the like. The refractory material prolongs the service life of a furnace body, prolongs a repair cycle, and saves the production cost.

Description

Refractory material for dry quenching

Technical field

The present invention relates to a kind of refractory materials, particularly a kind of refractory material for dry quenching.

Background technology

CDQ technology is for the red burnt technology of traditional wet-treating, its principle is to use nitrogen the coke of red heat is cooled off in coke dry quenching furnace and to discharge coke, after the heat exchange nitrogen after first dedusting in boiler with the salt solution heat exchange, produce steam, recycling process under the suction of final dusting at circulating fan.CDQ technology becomes the technology that clearly must adopt in the Chinese coking industry permit standard because it has the advantages such as the energy of recovery, protection of the environment, raising coke quality.The environmental work environment is abominable in the coke dry quenching furnace, and the anti-material of its liner will have performances such as height is withstand voltage, high abrasion, high thermal shock.

Dry quenched coke oven chute position pillar brick plays a part to support the annular passage interior wall in stove, the dried stove chute pillar stiffener position of putting out, be subjected to every year about 20,000 times, the repeated stock of 200～1000 ℃ of temperature variation, huge thermal shocking causes the spalling of refractory materials to be damaged, secondly the chute district is subjected to coke breeze to wash away one of the most serious position, chute district pillar stiffener is supporting most portions weight of upper, annular air flue and the section of prestoring masonry, further caused should the zone damage, the inequality of coke discharging temperature causes the dried reason that thermal stresses that the circumferential inequality of temperature causes etc. has all caused chute district pillar stiffener to damage of putting out in the stove.In addition, capabilities of refractory materials problem, reducing gas have also been aggravated the damage of chute district pillar stiffener to factors such as the erosion of refractory materials, alkaline attacks.

The weight of coke dry quenching furnace cooling zone position load-bearing bed rearrangement dry coke quenching body of heater liner, and washing away of wall caused the wearing and tearing of furnace wall when sunk by coke, this Duan Naicai wearing and tearing in 1 year are about 40mm, serious zone is near 60mm, wear pattern was even more serious in 1 year, was the twice abrasion loss in 1 year basically.Owing to have CO in the stove internal recycle gas, in 300～600 ℃ of scopes, can isolate uncombined carbon, refractory materials there is erosion action, can cause the damage fully of refractory brick marshalling, if contain iron contamination in the material, can make this chemical reaction aggravation.

At present dry coke quenching chute position and cooling section position use result of use preferably material is respectively mullite silicon carbide material and BM mullite material, but this bi-material all exists service life not long, the defectives such as maintenance frequency height.The mullite silicon carbide material that use at dry coke quenching chute position, the coke dry quenching furnace of handling the coke ability with present 140T/h is an example, the pillar brick mostly is 13 layers of mullite silicon carbide refractory brick and builds by laying bricks or stones, be generally about 14.7 degree in the body of wall angle, the about 204T of top load-bearing, under so long-term weight condition, the situation of whole crack and the fracture of brick body can appear in the anti-material of mullite silicon carbide, be generally about 1 year the work-ing life of chute position pillar refractory brick, for ensureing the safety and firmness of body of heater, use producer need carry out regular maintenance, to replace compressive strength under serious its normal temperature of refractory brick of damage.What the anti-material in dry coke quenching cooling section position used is the BM mullite brick, the BM mullite firebrick can reach requirement aspect abrasive wear resistance, key is to solve wear resistance and the not enough defective of erosion-resisting characteristics that this material exists, and these defectives will cause its work-ing life not long, maintenance frequency height.

Summary of the invention

Technical problem to be solved by this invention provides a kind of compressive strength height, wear resistance is good, thermal shock performance is good refractory material for dry quenching.

For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of refractory material for dry quenching, contain weight ratio and be 35～50% SiC, β-SiC of 20～35%, 0.05～1.0% Fe ₂O ₃With 5～15% Al ₂O ₃

Refractory material for dry quenching of the present invention has advantages such as compressive strength height, wear resistance is good, thermal shock performance is good.This anti-material prolongs body of heater service life, prolongs the time between overhauls(TBO), can cancel annual repair schedule, saves production cost.

Embodiment

Below in conjunction with specific embodiment the present invention is done detailed explanation.

Present dry coke quenching chute position and cooling section position service condition material preferably are respectively mullite silicon carbide material and BM mullite material.

Mullite silicon carbide refractory brick material forms basic framework by mullite and carborundum, and its component is 3～15%wt metallic silicon, 35～65%wt sintering and/or electrofused mullite, 25～45%wt carborundum, 3～5%wt α Al ₂O ₃Micro mist, 4～10%wt clay.Characteristics such as the refractory brick of this material has the volume density height, and void content is low, and high temperature resistance erosion and wear resisting property are good can reach the requirement of the anti-material of coke dry quenching furnace liner substantially.

It is primary raw material that the BM mullite brick adopts mullite, and key component is SiO ₂32～40%wt, Al ₂O ₃55～65%wt, Fe ₂O ₃0.5～1.3%wt.This material has advantages such as compressive strength height, thermal stability be good.

This bi-material can adapt to the instructions for use of dry coke quenching body of heater substantially, and with regard to present operating position, this bi-material all exists service life not long, the high defective of maintenance frequency.

Raw material employing β-SiC of the present invention as base stock, adds the Al of certain weight proportion in conjunction with SiC ₂O ₃, control Fe ₂O ₃Proportion in material.Wherein contain weight ratio and be 35～50% SiC, β-SiC of 20～35%, 0.05～1.0% Fe ₂O ₃, 5～15% Al ₂O ₃

Wherein, β-SiC is made up of α-SiC, Si powder and C powder.

Table 1 is the components by weight percent table of mullite silicon carbide brick, BM mullite brick, β-SiC brick.

Table 1

Embodiment 1

It is 35% SiC, β-SiC of 20%, 0.05% Fe that refractory material for dry quenching contains weight ratio ₂O ₃With 5% Al ₂O ₃

Embodiment 2

It is 50% SiC, β-SiC of 35%, 1.0% Fe that refractory material for dry quenching contains weight ratio ₂O ₃With 15% Al ₂O ₃

Embodiment 3

It is 47% SiC, β-SiC of 30%, 0.75% Fe that refractory material for dry quenching contains weight ratio ₂O ₃With 10% Al ₂O ₃

The preparation method of β-SiC is:

(a) α-SiC, Si powder and C powder are mixed, add wedding agent;

(b) after said mixture is mixing, moulding, the drying, fire through 1400～1600 ℃ in neutrality or reducing atmosphere, Si, C generate β-SiC under hot conditions;

(c) by the β-SiC generation high temperature modification β-SiC of α-SiC particle in conjunction with above-mentioned generation.

The forming technique of refractory brick: the production technique of refractory brick is to select materials → pulverize → condiment → moulding → drying → burn till → pack.In each link of technical process, moulding is that fire-resistant blank is by external force and model, become have certain size, shape and the base substrate of intensity or the process of goods, moulding is the important step of refractory brick production technique, be to make the blank endoparticle intensive, and exhausted air, the process of formation dense green.The mechanical pressing method is adopted in refractory brick moulding of the present invention, adopts two-sided pressurization, avoids the brick body to produce slabbing in pressing process, reduces the void content of base substrate.In pressing process, pressure arranges and adopts earlier light rear heavy method, is conducive to the discharge of base substrate air.

β-anti-material of SiC series is to adopt β-SiC and Al ₂O ₃Be primary raw material, by certain grain size distribution, adopt the novel refractory of mechanical pressing method development, mainly be used in coke dry quenching furnace as inner lining material, have the advantages such as compressive resistance height, wearability is good, thermal shock performance is good.At present, this anti-material at home certain large-scale coke-oven plant disposal ability is on probationly on the coke dry quenching furnace of 140T/h to surpass 18 months, does not find that the anti-material in pillar position and cooling chamber position has the situations such as fracture, heavy wear, has cancelled annual repair schedule.This anti-material has and prolongs body of heater work-ing life, prolongs the turnaround, and advantage such as save production cost.

Claims

1, a kind of New-style Coke Dry Quenching refractory material is characterized in that it is 35～50% SiC, β-SiC of 20～35%, 0.05～1.0% Fe that this refractory material contains weight ratio ₂O ₃With 5～15% Al ₂O ₃