2017年3月14日星期二

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.

2017年2月5日星期日

Why do refractory castables with mobility

Castable is a very wide range of refractory material, for its extensive use mainly because of its performance advantages, and significant features, we may be able to understand, it has a certain liquidity, it is because of the What, where Xiaobian to tell why the castable materials with liquidity.


The refractory castable is a kind of granular and powdered material made of refractory material, which is composed of a certain amount of binder and water.It has high fluidity, suitable for construction by pouring method and can be hardened without heating. It is made up of refractory aggregate, powder, binder, admixture, water or other liquid materials.It is usually cast in the field by casting, vibration or tamping, and can also be used as preform.

2017年2月4日星期六

How to extend the service life of medium frequency induction furnace

To extend the life of induction furnace is the only pursuit of each casting, but there are also the significance of the enterprise. The main factors affecting the service life of the intermediate frequency furnace include refractory lining and furnaces in the paving process, the furnace construction process, the baking process and the use process. The following highlights the introduction of two aspects.

Furnace lining lining refractories refractory material quality and performance of the refractory furnace has a vital impact on the life of the furnace. Therefore, they must meet the following requirements.

1. First, the furnace refractory must have good performance. First of all, refractories need to have a relatively high refractoriness to resist heat loads at high temperatures and will not be softened and melted. Second, at the same time, in order to resist the high temperature heat load, they must have high capacity stability. It must therefore be realized that its volume will not shrink, even if inflation is only allowed to exist. Third, they must have relatively high atmospheric temperature strength and high temperature thermal strength and high enough load, for this purpose this force is still in the high temperature of the heat load and heavy load which does not interact with creep and folding. Fourth, it is required to have good thermal shock resistance to resist severe temperature changes and cracks or not appear. In addition, a good slag resistance is also required.

2. Refractory content. Impurities Refractory company products will form refractory compounds with low refractory refractory properties when the temperature is high. The impurity content in the refractory material increases, and the service life of the furnace is shortened. Therefore, it is necessary to ensure that the quartz content and impurity content in the furnace sand must be strictly controlled.

3. Particle size of the refractory fraction. Reasonable particle size fractions make the Hall of Fame postpone high-density coatings very easily during furnace construction in the form. Therefore, the defect is not easy to appear in the course of using. Paving the quality of the furnace furnace life and the importance of safe intermediate frequency electric furnace. First of all, check whether there is damage to the coil paving, heat treatment furnace front. If it does not exist, repair it by painting the damaged portion of the varnish. Stir the refractory clay with water glass, equivalent to the furnace wall, and then clean the furnace wall and floor. Third, has spread the pre-sheared mica plate, alarm stainless steel mesh and asbestos cloth. Fourth, the stainless steel wire mesh with copper core and pierce it from the furnace coil. Next, use three piston rings to tighten the bottom, middle and top asbestos cloths laid on the furnace wall. Finally, cover the furnace after paving to prevent debris fall into it.

2017年1月12日星期四

Analysis on Product Characteristics and Classification of Mullite Insulating Bricks


Mullite insulation brick is mullite (3Al2O3 · 2SiO2) as the main phase of the high-alumina refractories. General alumina content of 65% to 75%. Mineral composition In addition to mullite, which contains the lower alumina also contains a small amount of glass phase and cristobalite; containing higher alumina also contains a small amount of corundum. Mullite insulation brick can be directly used for high temperature furnace lining, has been widely used in shuttle kiln, roller kiln, glass and petrochemical furnace lining.

First, the mullite insulation brick product features:
1, low thermal conductivity, with good insulation effect;
2, mullite insulation brick low melting, due to low thermal conductivity, mullite series of lightweight insulation brick accumulation of little heat energy, intermittent operation in the energy-saving effect is obvious; 3, impurity content is very low, Metal and other oxide content, therefore, high refractoriness; higher aluminum content in the reducing atmosphere to maintain good performance;
4, mullite thermal insulation brick high pressure strength;
5, the appearance of accurate size, speed up the masonry speed, reducing the use of refractory material mud to ensure the strength and stability of masonry, lining to extend the life;
6, mullite insulation brick can be processed into a special shape. To reduce the number of brickwork and joints.
Second, the mullite insulation brick classification: mullite insulation brick according to the density of different light and heavy mullite bricks, according to the use of different temperature is divided into: 1350 mullite insulation brick, 1450 mullah Stone insulation brick, 1550 mullite bricks and so on. Mullite insulation brick performance and its application: high refractoriness, up to 1790 ℃ or more. The softening start temperature of the load is 1600 to 1700 ° C. Room temperature compressive strength of 70 ~ 260MPa. Thermal shock resistance is good. There are sintered mullite bricks and fused mullite bricks. Sintered mullite brick to bauxite clinker as the main raw material, adding a small amount of clay or bauxite as binder, by molding, firing and made. Fused mullite bricks to high bauxite, industrial alumina and fireclay refractories as raw materials, by adding charcoal or coke fine particles as a reducing agent, forming after the use of reduced melting method to manufacture. The fused mullite is more crystalline than the sintered mullite and has better thermal shock resistance than the sintered product. Their high temperature properties depend mainly on the alumina content and the homogeneity of the mullite phase with the glass distribution. Mainly used for hot stove top, blast furnace and the bottom of the furnace, glass furnace regenerator, ceramic sintering kiln, oil cracking system, such as dead angle lining.

2017年1月11日星期三

Analysis on firing method of mullite refractory brick

Mullite bricks are sintered mullite bricks and fused mullite bricks.
Mullite Insulating Firebrick refractoriness higher, up to 1790 ℃ or more. The softening start temperature of the load is 1600 to 1700 ° C. Room temperature compressive strength of 70 ~ 260MPa. Thermal shock resistance is good.

Mullite bricks are sintered mullite refractory brick and fused mullite bricks. Sintered mullite brick to bauxite clinker as the main raw material, adding a small amount of clay or bauxite as binder, by molding, firing and made. Fused mullite bricks to high bauxite, industrial alumina and refractory clay as raw materials, by adding charcoal or coke fine particles as reducing agent, forming after the use of reduced melting method to manufacture. The fused mullite is more crystalline than the sintered mullite and has a better thermal shock resistance than the sintered product. Their high temperature properties depend mainly on the alumina content and the homogeneity of the mullite phase with the glass distribution. Mainly used for hot stove top, blast furnace and the bottom of the furnace, glass furnace regenerator, ceramic sintering kiln, oil cracking system, such as dead angle lining.

Mullite Insulating Firebrick---Refractory Brick---Refractory Material---Changxing Refractory

Mullite Insulating Firebrick

Introduction:
Light Weight Mullite Insulation Brick can be widely used as lining or insulation layers of various industrial furnaces and kilns in metallurgical industry, machine building industry, ceramic industry, chemical industry.

Advantages:
products containing a large number of closed pores, and a lightweight high temperature, good insulation properties, refiring small contraction, excellent thermal shock resistance, strong resistance to the corrosive gas and slag. Products can greatly improve the thermal efficiency of the kiln to shorten the production cycle, reduce the kiln body weight to achieve energy saving.

Application:
It has excellent thermal shock resistance, strong resistance to the corrosive gas and slag.

Content source:
http://www.yilongrefractory.com/AllProductOneServlet?id1=1&id=15
E-mail:sales8@chinaelong.com

2017年1月4日星期三

The difference between anti-peeling high-alumina brick and 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 refractories 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.

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.

From the following aspects to clarify the problem:

First, the lower firing temperature 150 ~ C. Because of high temperature firing and insulation, especially in the greater than 1450 ℃ after the refractory refractory energy consumption can be infinite, according to the present refractory brick high-alumina brick 300,000 t / a count, estimated savings of 50,000 tons of standard coal.

Second, compared with the traditional high-alumina bricks, anti-shedding high-alumina brick thermal conductivity value of the former 2/3, or even lower, compared with magnesium chrome brick, as long as 1/3 ~ 2/3. Anti-shedding high-alumina brick and adjacent alkaline brick, lower carcass surface temperature 75-98 ℃, preliminary accounting can save nearly 2000t / a standard coal. Saving effect, considerable economic benefits.

Third, the traditional high-alumina brick can not enter the large-scale dry kiln, due to the use of life is too low, repair, stop kiln frequently form considerable energy loss and economic losses. More noteworthy is that it can not overcome the inherent weaknesses in the use of harsh locations.

Fourth, the world today with the rapid development of industry, to the formation of the Earth's environmental pollution infinite economic losses, the serious problems of human health has been more and more people's attention. In order to make a long life, we must take into account the material itself can not be a source of pollution. The excellent function of anti-shedding high-alumina bricks can largely replace the magnesia-chrome bricks. Magnesia-chrome brick in the course of processing and waste brick processing will bring serious "chromium pollution", its scientific component is carcinogenic substances. In Europe and the United States has gradually abandoned the production and use of this material, and quickly developed in the development of chromium-free goods, and anti-shedding high alumina brick is an excellent alternative.

The anti-drop high alumina brick is successfully used in the relevant parts of the cement kiln and used in the large-scale float glass kiln regenerator, instead of the traditional magnesia chrome brick, not only prolongs the kiln service life, but also eliminates the chromium pollution. In addition, the anti-shedding high-alumina brick firing temperature than magnesium-chrome brick low about 300 ℃, energy-saving effect is considerable.

Anti-shedding high-alumina brick as a versatile and efficient new energy-efficient refractory material, the American Ceramic Society magazine will be informed of this material as "the development of a potential by China's new high-alumina refractories." Anti-shedding high-alumina brick in the metallurgical and building materials industry has a wide range of applications.