2015年6月4日星期四

Refractory for ordinary boilers

Ordinary boiler boiler tube system, combustion chamber, flue and dust collector and other parts, the work is not high, mainly for industrial and civil heating and other departments. Therecastable  refractoryare many types of boilers, the number of large, commonly used coal as fuel; there is heavy oil or gas. Today, we introduce fire resistant materials for ordinary boiler…
Ordinary boiler combustion chamber operating temperature for 1400 to 1600 DEG C, the lining generally use a clay brick masonry, the remaining parts of the lining and flue layer with three level of clay brick, non working layer adopts ordinary red brick masonry. Recently, some of the boiler combustion chamber is lined with refractory of 1710 – 1790 DEG C of the refractory can be plastic ramming or refractory castable watering, flue layer with high alumina cement clay castable refractories production and its application effect is good.
Some of the ordinary boiler front arch temperature of 1300 to 1400 DEG C, using high aluminaCeramic Fiber Blanketcements high alumina castable or phosphate clayey castable watering. After the arch parts of the work temperature of about 1000 DEG C, is commonly used in high alumina cement clay refractory castable production, the remaining parts of the lining, the Portland cement or high alumina cement clay castable; coal-fired boiler are generally installed with a dust remover, temperature is not high, but the smoke and dust grinding loss is severe. If a steel plate to produce the dust collector and the inner wall should daub fruit plate making precipitator by silicate or phosphate refractory and the inner wall should be using water glass or refractory phosphate coating material for protection layer, service life can improve the L ~ 3 times.
In order to save energy and low temperature part of the ordinary boiler can use insulation board and light refractory pouring material used for lining, high-temperature parts also added a heat insulation layer, to reduce heat loss of a furnace body and improve boiler potency.

2015年6月2日星期二

Production technology introduction of high alumina brick

High alumina brick and clay brick of the same way of molding production. The process of crushing, mixing, molding, drying, sintering, and testing, packaging, etc.. Production practice proved that the high Al clinker in front of the broken strictly chosen grading, low temperaturerefractory blockunder the compressive stress bear better but high temperature slightly lower so kiln in piling up less than 1 meter, and siliceous brick can be up to 1.7 meters. There are just some differences in process parameters… And classification of storage using bauxite and clay together with fine grinding method can improve the quality of products.
Raw materials and technology: mineral mainly consists of Mo mullite and corundum phase and blast furnace with corundum mullite brick using artificial electric melting or sintering corundum and Mo mullite raw materials as the main raw material, through high pressure shaping and high temperature sintering, mineral mainly consists of mullite. Features: the products have apparent porosity rate is low; load softening point, high creep resistance and chemical corrosion resistance excellent characteristics. Features: the product has the appearance of pure white, precise size, withrefractory brickexcellent physical properties and chemical erosion resistance of high temperature. Uses: mainly used for blast furnace bottom and hearth, is one of the advanced large blast furnace and ceramic cup material.
High alumina brick and clinker clay brick production process is similar differences. Uses: large blast furnace with advanced ceramic cup “one of the materials and hot blast stove industrial furnace in high-grade refractory material can be used. Raw materials and technology: blast furnace with mullite brick using artificial electric melting or sintering Mo mullite raw materials as the main raw material, through high pressure shaping and high temperature sintering is ingredients in a higher proportion of clinker can be as high as 90% ~ 9% clinker before breaking for classification is chosen, screened in addition to iron firing temperature is higher, such as high alumina brick tunnel kiln firing average 1500 ~ 1600 DEG C.