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The refractory brick manufacturer tells you: what are the differences of the parameters of the tunnel kiln to the refractory brick
The brick and tile baking kiln is divided into tunnel kiln and wheel kiln, and tunnel kiln is divided into flat roof and arch tunnel kiln. The rotary kiln is divided into two forms: straight through and curved through. The firing temperature of brick and tile flat roof tunnel kiln is below 1200 ℃, and the higher temperature is 1100 ℃ in the usual firing criterion.
According to the firing criterion, the kiln is usually divided into three sections: pre heating zone, firing zone and cooling zone. The temperature of each section is also different, so the requirements for the aluminum content and fire resistance of refractory bricks are also different. The kiln body is composed of kiln wall and kiln top. According to the different structure of the kiln and the different sections of the kiln, different requirements and specifications are put forward for the masonry materials. The common requirements are as follows: the kiln wall and the kiln top separate the tunnel tunnel kiln internal channel from the external The heat generated in the burning of fuel in the tunnel kiln is exchanged with the body. In addition to being absorbed by the body, some of the heat generated in the process of exchange is lost through the wall to the outside. The lost heat is the heat that the wall insulation should try to reduce. Therefore, the building materials of the wall should not only be able to withstand high temperature, but also the total heat transfer coefficient should be controlled to a certain extent Range. As the support carrier, the kiln wall must accept the gravity action of the structure of the kiln top, so the masonry material of the kiln wall must have a certain compressive strength.
In order to reduce the heat transfer through the wall, the apparent porosity of refractories is clearly required as a primary goal. Apparent porosity is the main objective of evaluating the quality of refractories or finished products. It can not only reflect the compactness of refractories, but also indicate whether the manufacturing technology is reasonable. In addition to lightweight refractory products, low porosity raw materials or finished products are beneficial for improving product quality, improving mechanical strength of finished products, reducing surface area touched by slag and extending service life. The compressive strength of refractories at room temperature is very high, and deformation will occur with the increase of temperature. As for tunnel kiln, it is required that the degree of deformation of refractories should be satisfied with the production demand when the firing temperature is high, that is, the load of refractories should be soft and the chemical point should be satisfied with the design demand.