Refractory material for lime kiln

There are many kinds of main shaft kiln, lime kiln, rotary kiln and annular kiln etc… Most of the countries with the shaft kiln production of lime; the lime requirement is large, using rotary kiln.

Lime shaft kiln feed around the mouth and pre tropical lining of the body temperature is low, mainly due to mechanical impact material and wear, can choose the dense clay brick masonry. Calcined lime kiln lining body, subjected to chemical erosion wear, material flow and CaO at high temperature, rapid damage. For the small shaft kiln, generally used in low porosity and high alumina brick and illuminate brick; for large shaft adopt magnesia chrome brick, magnesia brick, magnesia spinel brick and brick for burning zone lining of the body.

Lime shaft kiln cooling zone and a lining material around the mouth, using the temperature is relatively low; damage reason is lime wear and alternating hot and cold induced temperature difference, the site selection of high – strength of clay brick masonry.

The laying of firebrick in furnace

Drum type heating furnace is mainly composed of a cylinder, head, tube, pipe, oil (water) distribution pipe, smoke box, a chimney, saddle and the interface tube etc… The combustion of the fuel in the furnace, forming high temperature flue gas and release the heat, high temperature flue gas heat generated by a fire tube or pipe to heat conduction, convection, radiation, convection, the heat is transferred to the medium in the furnace, the temperature reached the process demand.

The heating furnace in the burner side fire tube entrance laying 1.2 ~ 2.4m long refractory brick, the fuel burns, ceramic fiber blanket generates a lot of heat in the refractory brick refractory brick surface, heat transfers to the outside, causing the distance refractory brick recent fire tube heat intensity is too high, local overheating, oxidation, axial, radial deflection indentation deformation.

Transfer station is widely used at present, self discharge process, silt into the furnace from the water discharge pipe, the heating medium convection heating furnace of sediment, stirring constantly, and finally fell on top of the fire tube and smoke pipe.

Can be found in dredging, heating furnace overhaul, the heating furnace tube sediment thickness more than 150mm, especially in the high temperature zone of the fire tube (refractory bricks in 100 ~ 500mm of maximum sediment thickness). Under such circumstances, is bound to cause loss, heat transfer efficiency of the heating furnace of local overheating, drum kits, perforation may happen at any time.

The innovative development of refractory material

In high production, refractory material  based on the characteristics of heat resistance, plays an irreplaceable role in high temperature industrial development. It is widely used in metallurgy, petroleum, chemical, ceramics, glass and other industries, and provides convenience for the development of industry. Therefore, refractory products market is the vast.

A general increase in 2014 production of refractory products. One led by Liaoning, reached 4583429 tons, achieved the growth of 5.27%. But the yield at least Xinjiang, although 1-2 monthly production is 2000 tons, but also the growth of 21.07%, than in the past has been greatly improved.

Production and processing of refractory material production,because of the need for natural resources as the foundation, so the regional demand is very high.Refractories enterprises are mostly distributed in the regions of China East China and southwest, central China area almost no. Dispersive inter industry.

As refractory materials have certain market products, in order to have a better development in the future road, while maintaining the original advantages at the same time, and constantly innovation, in innovation and development. New products from quality of original for energy saving, environmental protection, many varieties, high profit, so as to increase their competitiveness in the market is refractory products remain invincible in the market.

China is already a big country of production of refractory materials

Refractories industry is developing with the development of the national economy, up to now, refractories industry is still in the development of the industry plays a vital role in. 1-3 months of 2014 China’s refractories production reached 24135668.45 tons, accumulated year-on-year growth of 9.51, in March production reached 9242563.07 tons, grow 11.89 compared to the same period.

The data can be seen, Shanxi province in 2014 1-3 month refractory cumulative year-on-year growth of larger, reached 15.22, and the area of March declined by 17.45 percentage points. Hebei is the largest decline in 1-3 months, the decline range 28.35, its output in March also decreased by 31.76, it is not difficult to see that, in spite of the refractory total output is rising, but the various regions, there are up and down, development is not stable.

At present our country has large production of refractory materials,but the overall technological level and industrial structure still have greater disparity with the international advanced level, the development trend is also big ups and downs, these problems are restricting the development of the industry. If not promptly improved, if things go on like this, the industry will face more backward embarrassing situation.

In future development, refractories industry must speed up the adjustment of industrial structure, eliminate backward production capacity, improve the level of production technology, to the international market as the guide, and gradually to the development of low energy consumption, high quality, to win in the market competition in the stability, better development!

Matters needing attention during the construction of the castable refractory

Refractory castable is a widely used refractory products, it is there for many industries are very popular, because often used to this kind of refractory products, so today Xiaobian to introduce the construction of refractory castable, should pay attention to the related matters.

The first step in the pre construction should be strictly examined, including: (1) to form a clear structure of castable refractory equipment is, and it will be clean. (2) to know have the process holes (3) construction require the use of the equipment must be in good condition, so we can ensure that the work can be carried out smoothly, (4) to know how is refractory castable packaging and delivery date, check whether the product failure. Using the second step is the construction of templates you can use steel or hard wood. But must ensure that the template has a very good rigidity, also is the strength to be good enough, so as to ensure not to use when running, will not shift, leakage. The use of wood template you must brush on a layer of waterproof paint, but steel template will be used in addition to mold agent, want to save template words, must be cleaned before use.

The final point to note is the lining refractory castable, stirring time, time can not be less than 5 minutes, can not use ordinary mixer, and to the use of forced mixer, must first dry mixed before mixing, then adding 80% solvent mixing, slowly stirring to obtain suitable work consistency. If there is something still unknown that you can contact us freely.

Application of silica brick in hot air furnace

In hot air furnace temperature is the highest part of the vault, a chunky “bottle” shape, bottleneck vertically according to the circular arc gradually shrink into a flue gas passage diameter with 1750mm “”. In the elevation of + 18.190 m furnace shell diameter expanded with 8010mm, the biggest part of crown, the crown began to merge with large wall masonry.

Precombustion chamber for hot blast stove top position, the total height of about 5m. The roof is covered by a semi spherical, ceramic fiber module under the “burner” system is a cylindrical structure, furnace shell diameter Φ 5094mm, which provided with annular gas, air collector refractory brick, gas, air “burner is provided with a total of 52 small diameter ceramic layer on the 2m high inner wall of the collector “

Precombustion chamber big wall thickness of 1317mm, the combustion space of 2460mm diameter. “Burner” system of flue gas outlet and the vault “bottleneck” cohesion. Gas, air through the external gas, air pipe to, by the gas, air collector 52 rotary jet “burner” implementation of gas combustion.

The low price of clay and silica refractory bricks, accounting for about 96% of all refractory material weight. Only in critical areas such as refractory brick precombustion chamber, a hot air outlet, use a small amount of a higher grade, such as Mo to brick, low creep high alumina brick, but only about 6% of the number of great wall.