Mechanical Analysis of Ceramic Thermal Insulation Board in Boiler Insulation

In order to solve the boiler and coal load and load adaptability, according to the boiler required by the minimum stable load and coal characteristics, based on the two or three insulation products board laminated structure adjustable adjustable combustion zone.

Each group of adjustable fuselage device mainly consists of inner, middle and outer three layers of insulation board, each insulation layer by the microporous ceramic insulation board using embedded method and heat-resistant steel structure of the integrated structure of the insulation board The

Ceramic insulation refractory fiber board ceramic fiber paper directly exposed to the flame, the steel structure from the heat-resistant flat steel or angle welded together, from the flame directly. The heat-resistant side of the ceramic insulation board is processed into a smooth plane, and the back-fire side is a microporous structure layer, and its pore density can be controlled between 0.5 and 2.0 mm by the foaming manufacturing process.

Due to the use of embedded structure, under normal circumstances, ceramic insulation board from external force, and therefore its strength is not high. The friction of the entire insulating castables layer and the friction in the movement of friction by the steel structure of the insulating castable refractory layer, therefore, the entire adjustable combustion belt design requirements to ensure that: in the furnace conditions, each activity of the insulation layer of steel The actual operating temperature does not exceed its permissible long term operating temperature limit and requires sufficient strength margin.

Anti-peeling high-alumina brick and the difference between ordinary high-alumina brick

Refractories are widely used in metallurgy, building materials, chemicals, petrochemicals and machinery manufacturing and other industrial areas, play an active role in the national economy. However, the application of refractory in high-temperature furnace evaluation, in addition to improving the service life, lower kiln energy consumption, it should also contain refractories in the production process of their own energy-saving, that is selected in the production of low-temperature firing, the product has the appropriate Of the high-temperature characteristics and low thermal conductivity.
In this case,
Compared with the traditional high alumina brick, the thermal shock resistance is high, the strength is high, the chemical resistance is low, the coefficient of thermal expansion is low, the thermal conductivity is low, the firing temperature is low, and the material function is greatly improved. Consumption.
In this case,
From the following aspects to clarify the problem.
In this case,
First, the lower firing temperature 150 ~ C. Because of high temperature firing and insulation, especially in greater than.

Monoblock Stopper---used for purifying liquid steel---Changxing Refractory material

Monoblock Stopper---Changxing Refractory material

Monoblock Stopper

Introduction:
Changxing's stopper rods are made from alumina-carbon in isostatic presses with zirconia inserts and/or magnesia tips as necessary for optimum performance. Argon channels are likewise available to suit a particular operation. Stopper rods are all X-rayed before shipment to eliminate flaws and cracks. Stopper rods can be supplied bare or with mounting hardware as required.

Advantages:
1. Stopper is used to control the flow of steel through the Tundish Nozzle. It is made of Magnesia Carbon or Alumina Carbon quality with special compositions at the tip and slag zone to suit customer requirements. Cross pin or screw fastening or gas purging facilities are provided as and when required. 2. For high performance applications, a range of special mixes are available for the stopper head or the slag line, each composition is custom formulated for the particular steel composition or casting conditions

Application:
This product enjoys performances of purifying liquid steel, prevent liquid steel oxidation, with good liquid steel washing resistance and erosion resistance.

Content source:
http://www.yilongrefractory.com/ProductServletOne?id1=4&id=57
E-mail：sales8@chinaelong.com

What are the general requirements for refractories material in electric arc furnaces

General requirements of the refractory arc furnace:
① high refractoriness: arc temperature above 4000 ℃, steelmaking temperature often 1500 ~ 1750 ℃, sometimes as high as 2000 ℃, therefore, require refractories must have high refractoriness.
② high load softening temperature: EAF steelmaking process is under high temperature load conditions, and the furnace to withstand the erosion of molten steel, so the refractory material must have a high load softening temperature.
③ good thermal stability: EAF steel from the steel to the charge within a few minutes of rapid temperature changes, the temperature dropped from the original 1600 ℃ suddenly dropped to below 900 ℃, and therefore requires good thermal stability of refractories.
④ slag resistance is good: in the steelmaking process, slag, furnace gas, molten steel on the refractory company material has a strong chemical erosion effect, so the refractory should have good slag resistance.
⑤ high compressive strength: electric furnace lining in charge by the impact of the charge, the molten steel by the static pressure, tapping the steel by the scour when operating by mechanical vibration, so the refractory brick for sale must have a high pressure strength.
⑥ low thermal conductivity: In order to reduce the electric furnace heat loss, reduce power consumption, requiring the thermal conductivity of refractories to be poor, that is, the thermal conductivity is small.

How to Choose Refractory Bricks Used for Different Parts of Blast Furnace

1. Good corrosion/erosion resistance 2. High temperature performance 3. Longer service life 4. Stable structure 5. Thermal shock resistance

How to choose refractory brick used for different parts of blast furnace?

When choosing refractory brick used for different lining parts of blast furnace, we should follow some principles. The refractory lining of every part should fit the parts thermal current intensity, so that the lining can maintain previous vertebral shape and stability under the impact of strong heat flux. 

Here are some methods of selectingrefractory brick for sale for every part of furnace lining.
(1) Furnace throat. It mainly needs to withstand impact and abrasion of burden, so generally we use steel brick or water cooling steel brick for the furnace throat.

(2) The upper shaft. Plus the burden descent and ascending gas flow of scour and wear. Therefore, we should choose resistance to chemical erosion and abrasion resistance of refractory material, the most appropriate is high relative density brick, high density, high aluminum brick or phosphoric acid impregnated clay brick.

(3) The middle and lower part of nozzle refractory furnace and furnace bosh. The main mechanism of damage is thermal shock, high temperature gas scouring, and impact of alkali metals, zinc and carbon deposition, as well as chemical erosion of the initial slag. For those three parts, we should choose refractory materials with properties of thermal shock resistance, slag erosion resistance and erosion prevention. For blast furnace whose volume is smaller than 1000m3, we can use aluminum carbon brick. 

(4) Furnace bosh. Hot gas erosion and iron slag erosion are the main reasons for furnace bosh damage, this part of the heat flux intensity, refractory material refractory fiber felt life not long (as long as 1 to 2 months, as short as 2 to 3 weeks), generally used in refractory degree is high, load softening temperature is high and the volume density of refractory material, such as the high aluminum brick, alumina carbon brick. 

(5) Hearth tuber. This site is only in blast furnace of oxidation reaction area, high temperature from 1900 to 2400 DEG C, lining by damage caused by high temperature thermal stress. Composite brick masonry hearth tuyere zone is adopted by the modern blast furnace, material for high alumina, corundum Mo mullite; corundum and silicon nitride combined silicon carbide, useful also hot pressed carbon block. 

(6) The lower part and bottom of hearth. For those two parts, we use hot pressing small carbon brick, micro porous carbon brick, and hot semi graphite carbon brick with high thermal conductivity, good resistance to penetration, good resistance to chemical erosion, low porosity and micro aperture, as well as brown corundum or gray corundum brick used for ceramic cup.

Clay, High Alumina Insulating Bricks

Clay, High Alumina Insulating Bricks

Introduction:

Produced with unique advanced technology, the clay and high alumina heat insulating bricks possess the characteristics of high intensity for pressure and good thermal shock stability. The use of the bricks can reduce the heat capacity of kiln walls and promote the heat efficiency of kilns. The product is applicable for constructing industrial kilns and inner lining of kilns.

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