SU25478A1 - Muffle furnace - Google Patents

Description

A muffle furnace is offered with tube-like muffles that are heated by generator gas from above and below and connected in large quantities in one furnace. To heat the air, the furnace is equipped with a zigzag duct recuperator. The purpose of the invention is to save fuel consumption and obtain a uniform temperature at all points of the furnace.

FIG. 1 of a schematic drawing shows a vertical section of a muffle furnace along the line AB in FIG. 2; FIG. 2 is a vertical section through its line CD in FIG. 3; FIG. 3 is a horizontal section through its line EF in FIG. 2.,

A multi-muffle furnace with semi-gas, gas or oil heating is a series of long tube-like muffles that are connected together in a system and heated outside by a flame. According to the principle, it is a tunnel kiln, in view of the fact that in such heated muffle tubes, the products intended for burning are heated, with further advancement, they burn and cool down in the same muffles before leaving the kiln. The muffle tubes, assembled together in an amount of 25 to 100 pieces, are lined with a solid refractory masonry with a vault, and is located under the furnace

heat exchanger for preheating the air required for combustion. In a muffle, a furnace with passage muffles, the flame should wash the rows of muffles simultaneously from the bottom and top, which gives uniform heating of all the muffles of the furnace. The use of a clean gas flame makes it possible to easily regulate the ratio of fuel to air and maintain the temperature required for firing.

The firing process in the furnace is performed as follows. The gas developed in generator A (Fig. 2) enters channel B, divided into two arms: from one gas, combustion, passes from below between separate muffles, from the other gas rises up and from above in the form of flame passes between muffles mi (Fig. 2). The required combustion air is heated in the recuperator due to the heat of the waste combustion products and flows in the first case from below to the channel, in the second case goes up to the burner of the second channel. The flame and combustion products in this furnace are washed muffles on one side from the bottom and on the other side from above, which gives an even temperature distribution over all the muffles at the same time. The combustion products pass from the middle of the muffles to the kiln entrance in a zigzag manner before chimney. Verifying the overheating of the muffles during you: during the course of the products, the cooling of the muffles is performed by air entering the furnace through channel C; the air washes the muffles, lifting and lowering in a zigzag manner, in a heated form goes to dry products or to heat a building. The items are placed in the flat muffles. More coarse products, like tiles, tiles, are advanced when firing through unsealed muffles, while thinner heaps are usually placed on refractory slabs, which are the linings for the products to be baked.

The subject matter of the invention.

A muffle furnace with multiple muffles in the form of numerous tubes in which the burning products move, heated with generator gas and equipped to heat the air with a recuperator with a zigzag duct for exhaust gases, characterized in that the channel B going into the furnace from the gas generator A is divided into two sleeves, one of which serves to supply gas to its upper part, in order to heat the muffle tubes with a flame simultaneously from the bottom as well as from the top.