SU857684A1 - Method of automatic controlling of heat condition in slot furnace - Google Patents

Description

(54) METHOD FOR AUTOMATIC REGULATION OF THERMAL REGIME IN THE ALTITUDE OVEN

one

The invention relates to the manufacture of ceramic products and can be used in the building ceramics industry.

A known method of automatically controlling the thermal regime in a slit furnace by supplying the coolant to the heating and firing zones and feeding its agent to the cooling zone 1.

However, this method does not provide high quality regulation.

There is another method of automatically controlling the thermal conditions in the w, ceramic furnace with a mixture, ceramics used with a conveyor belt, including temperature stabilization in the heating, firing and cooling zones by changing the heat transfer medium to the heating and firing zones and cooling, its agent to the boundary of the burning and cooling zones. In this method, the supply of the cooling agent to the boundary of these zones is adjusted by the temperature at the beginning of the preheating zone 2.

The disadvantages of the method are fluctuations in the supply of tiles, and as a result, temperature instability in the furnace zones when the capacity changes, as well as an inopportune stopping of the conveyor moving the product, when pruis are formed on the conveyor, the quantity of defective products increases and the flow of heat carrier increases.

The purpose of the invention is to improve the accuracy of regulation.

The goal is achieved by the fact that in the method of automatic control of 10 thermal conditions in a slit furnace with ceramic products moved by means of a conveyor, including temperature stabilization in the heating, roasting and cooling zones by changing the heat carrier supply to the heating and roasting zones

15 and the supply of the cooling agent to the boundary of the burning and cooling zones, during stabilization of temperatures, the number of tiles is measured at several points along the furnace length, the difference between the subsequent measuring points and the previous measuring points is calculated,

Claims (2)

EO at a positive value of this difference reduces the flow of coolant to the section with the previous measurement point, and at a negative value of this difference stop the conveyor. The method is carried out as follows. Ceramic products move the conveyor inside the slot furnace. The set values of the medium temperature along the length of the furnace are maintained by sectional control of the supply of heat transfer fluid when the current temperature value in each zone deviates from the set value. The tile counters are installed at different points along the length of the furnace, they are turned on simultaneously with a fully filled line and the number of tiles passing by these counters is monitored, comparing while the neighboring counters. If the flow of tiles is uniform, the difference in the readings of adjacent counters is zero. This means that the flow of tiles is constant, which characterizes the normal loading mode of a slot-type furnace. If the difference between the readings of the subsequent and previous, for example, the second and first counters, is positive, then this means that the number of tiles near the first counter has decreased. To compensate for the effect of reducing the supply of tiles, reduce the gas flow to the section where the first meter is installed. If the difference between the readings of the next and previous, for example, the second and first counters, is negative, then this means that the number of tiles in the section where the second counter is installed is smaller than in the previous section. Consequently, a tile accumulates in the section of the furnace between the counters, i.e. a blockage of tiles is formed. To eliminate the blockage, stop the conveyor and free it from the tiles. Thus, by using signals from tile counters installed at several points on the conveyor line, it is possible to determine the deviation of the line loading mode from the nominal mode and take the necessary measures: reduce the coolant flow or stop the conveyor to eliminate the blockage of tiles on it. The invention The method of automatic control of thermal conditions in a slot furnace with ceramic products moved by means of a conveyor, including temperature stabilization in heating zones and cooling by changing the coolant supply to the heating and calcining zones of the cooling agent supply, characterized by that, in order to improve the control accuracy, during stabilization of temperatures, the number of tiles is measured at several points along the length of the furnace, the difference between the pos eduyuschimi and previous accurate measurements, for a positive value of this difference decreases its supply of heating medium in the section from the previous measuring point, and a negative value of this difference is stopped conveyor. Sources of information taken into account during the examination 1. USSR author's certificate No. 380930, cl. F 27 B 9/40, 1973. 2. USSR author's certificate number 364818, cl. F 27 B 9/40, 1973 (lrotype).