Types of heat treatment kiln commonly used for magnesium carbon bricks

Coal Kiln

Coal kiln is one of the earliest heat treatment kilns used by early magnesium carbon brick manufacturers. The coal kiln is designed to distribute the flue inside the kiln, as shown in Figure 1, the just repaired part is the damaged flue, when the coal burns the high temperature flue gases go through the flue, which makes the temperature inside the kiln rise. The kiln was designed with essentially no electrical aids, except for a thermometer at the head and tail of the kiln to observe the temperature inside the kiln. Coal kiln as a kind of heat treatment method is used, it must have its certain characteristics. Magnesium carbon bricks have just begun to appear, people do not pay too much attention to its appearance, the use of good and bad results to attract people's attention, so this very primitive kiln into the line of sight, as long as the effect of magnesium carbon bricks heat treatment can be achieved, so many of his shortcomings have been ignored.

Resistance Wire Kiln

With the development of magnesium carbon bricks, people have higher and higher requirements for heat treatment kiln, at this time many shortcomings of the coal kiln began to show, such as the kiln temperature is not stable, the appearance of the product is not beautiful, the smoke smoldering traces of serious and so on. So people began to design resistance wire kiln to replace the coal kiln, Figure 2 that is, the resistance wire kiln internal arrangement of resistance wire for heating, resistance wire kiln relative to the coal kiln has many advantages:

(1) heating speed, temperature uniformity, precise temperature control;

(2) production environment, no dust, no smoldering traces;

(3) the whole process of automated control, without human interference, high safety;

(4) because the resistance wire kiln is (4) As the whole kiln is uniformly heated, the temperature is uniform and stable, so the whole kiln life is long, basically can do the whole without maintenance, the only thing that needs to be replaced is the resistance wire.

From the above points can be seen by the use of resistance wire kiln is the trend of modern production, completely replace the coal kiln is just around the corner, in fact, also proved this point. Of course, relative to the resistance wire kiln for the coal kiln is not useless, it has an advantage that can not be ignored, that is, the low cost of heat treatment, according to the actual production comparison, coal kiln heat treatment of a ton of magnesium carbon bricks than the resistance wire kiln heat treatment of a ton of magnesium carbon bricks cost to be lower than the cost of 30 to 50 yuan, in addition to a few relatively backward manufacturers and the pursuit of low-cost manufacturers also retained a part of the coal kiln, the rest of the manufacturers are basically resistance wire kilns.

Microwave heat treatment kiln

Microwave heat treatment kiln is a new type of heat treatment equipment, although its theoretical basis has been established a long time ago, and has long been applied to microwave ovens, but it is really put into industrialized production on the time is not too long, and a lot of its technology and experience is not as rich as the resistance wire kiln, especially the magnesium carbon bricks of the heat treatment process, not only the process of moisture evaporation, but also phenolic resin curing process. Process.

For drying moisture only, microwave heat treatment kiln has the following characteristics:

(1) Fast drying speed, saving time. Conventional methods such as: steam drying method, electric drying method, hot air drying method, etc., the moisture content of about 30% of the billet dewatering to the moisture content of less than 1%, at least more than twenty hours, and the use of new microwave heat treatment equipment only requires more than twenty minutes to complete; moisture content of about 10% of the billet dewatering to the moisture content of less than 1% of the use of conventional methods take more than ten hours, and the use of new microwave heat treatment equipment only requires more than ten hours. Microwave heat treatment equipment only takes more than ten minutes; and water content in about 5% of the billet dehydration to the water content in 1% of the following conventional method takes six to seven hours, using microwave heat treatment equipment can be completed in a few minutes.

(2) high energy utilization, easy to operate. Because the microwave is directly acting on the material, so there is no additional heat consumption, while the conventional heating type of drying equipment, heat loss by the impact of the environment is very large, especially in winter heat loss is very large. And microwave heat treatment equipment heating speed block, with the use of open, do not need to be like conventional heating type drying equipment that needs to be warmed up and cooled down, saving heat. At the same time power adjustable, easy to operate.

(3) Good results, can maintain the original color of the material, not cracked. Microwave heating does not require a medium for heat conduction, microwave direct action on the material, so that its own heat, warming speed, temperature uniformity, will not cause cracking of the material phenomenon.

(4) assembly line operation, good working environment. Relative to ordinary heat treatment methods, microwave heat treatment equipment is simple and clear, covers an area of small, less ancillary equipment, as long as the most basic conditions of water, electricity can be put into production. In comparison, it can generally save 30%~50% of electricity, optimize the working conditions and save the working area. And the equipment is simple to operate, the operation of the whole set of equipment only requires about three people, running noise, greatly improving the site working environment.