SU1513360A1 - Method of controlling ceramic articles firing - Google Patents

Abstract

The invention relates to the manufacture of ceramic products and can be used in the building materials industry. To achieve the goal of reducing the cost of the coolant, the temperature in the heating, firing and cooling zones is measured, and if it deviates from the reference, the coolant flow is changed, the geometrical dimensions of the products at the furnace exit are measured, and the saturated steam flow is measured. When the geometrical dimensions of the products deviate from the task, the flow of heat-transfer agent or saturated steam is inversely proportional, and when the geometric dimensions of the items are reached, the task stabilizes the flow of heat-transfer agent and saturated steam. 2 Il.

Description

one

(21) 4369245 / 23-33

(22) 01/25/88

(46) 10/07/89. Bnsh. Number 37

(71) All-Union Scientific Research and Design Institute for Automation of Enterprises of Industrial Materials

(72) V.I. Kubantsev and A.K. Tarasov

(53) 66.041.9 (088.8)

(56) USSR Copyright Certificate 881503, cl. F 27 B 19/00, 1981.

(54) METHOD FOR REGULATING THE PROCESS OF THE BURNING OF CERAMIC PRODUCTS

(57) The invention relates to the manufacture of ceramic products and may be

used in the construction materials industry. To achieve a reduction in the cost of the coolant, the temperature in the heating, roasting and cooling zones is measured, and when it deviates from the reference, the coolant flow is changed, the geometrical dimensions of the products at the furnace exit are measured, and the saturated steam flow is measured. When the geometrical dimensions of products deviate from the task, the flow of heat-transfer agent or saturated steam is changed in the reverse proportion, and when the geometric dimensions of the items are reached, the task stabilizes the flow of heat-transfer agent and saturated steam. 2 Il.

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

The circuit of the invention is to reduce the cost of the heat transfer fluid. lower firing temperature and firing temperature.

And FIG. 1 shows a diagram of the implementation of the method for regulating the firing of ceramic products} in FIG. 2 is a graph of changes in the geometric dimensions of products versus firing temperature at various values of saturated steam consumption.

The designations adopted in FIG. T is the temperature in the burning zone;

1 -, the geometric dimensions of products;

Q - saturated water consumption

couple; VZ - upper limit

the value of the geometric dimensions of products; H.3.- lower limit

value of the geometric dimensions of products.

The furnace 1 for firing ceramic products (Fig. 1) consists of three zones: the heating zone A, the burning zone B and the cooling zone B. Each of the indicated zones is equipped with a temperature stabilization system in this zone, consisting respectively of sensor 2-4 , regulator 5-7 and setpoint controller 8-10 in each zone and regulator 11-13 on fuel supply lines to the corresponding zone.

3..1513

In addition, the burning zone is equipped with a system for stabilizing the flow of saturated water vapor, consisting of a sensor 14, a regulator 15 and a steam consumption setting device 16, as well as an adjusting member 17. At the exit of the furnace, a sensor 18 of geometrical dimensions of products is connected, connected with the input of the control device 19, associated with the setting units 20 and 21 of the upper and lower maximum permissible values of the geometric dimensions of products; The first output of the control device 19 is connected to the setting unit 9 of the temperature stabilization system in the zone of b-ligature, and the second output to the setting unit 16 of the saturated water vapor flow.

The method is carried out in the following manner.

In the initial state, in each of the three zones of the kiln 1, firing, by means of temperature stabilization systems, provide the specified temperature regime for the firing of ceramic products, such as tiles, by changing the fuel supply to the corresponding zone. The sensor 18 measures the geometrical dimensions of the tiles and compares them in the control device 19 with the upper and lower maximum allowable values entered by setting devices 20 and 21. For tiles of 150x150 mm, deviations from the nominal dimensions of not more than ± 1 are allowed, 2 mm. In the normal operation of the furnace, the geometric dimensions of the tiles are in the interval between the upper and lower maximum allowable values. Under these conditions, for example, with a tile size of 151x151 mm and a firing temperature of 1100 ° C, the task to setter 16 for the consumption of saturated water vapor begins to increase. The system of stabilization of saturated water vapor consumption fulfills this task.

An increase in the concentration of water vapor in the burning zone leads to a decrease in the geometric dimensions of the tiles. The value of setting the setting device 16 for steam consumption continues to increase until the steam consumption reaches the value Q, at which the geometric dimensions of the tiles will be equal to the lower maximum allowable value equal to 148.8 mm. At this moment, according to the signal of the control device 19, the change in the consumption of saturated water vapor, one hundred

Q s

0

5 0 c 0.,

0

five

bilizing its value at the reached level Q. At the same time, the task to set 9 of the system1 to stabilize the temperature in the burning zone starts to decrease. After working out a new task by the temperature stabilization system in this zone, the tiles are fired at a lower temperature, which causes an increase in the geometric dimensions of the tiles.

The reduction of the firing temperature is continued until it reaches a value equal to, for example, T 070 ° C, at which the geometrical dimensions, increasing, will be equal to the upper maximum allowable value equal to 151.2 mm; At this moment, according to the signal of the control device 19, the firing temperature is stopped to decrease, stabilizing it at the achieved level I.

At the same time, they again begin to increase the task to the setting device 16, thereby increasing the supply of the saturated water macaw to the burning zone. The whole cycle is repeated until, at the next / value, the steam supply practically does not stop reducing the geometrical dimensions of the products, i.e. dimensional changes will be less than a specified value, for example, 1/4 of the tolerance value. In the case under consideration, this occurs at 1 1045 C. Then the firing process is continued at the reached values of temperature and steam consumption, stabilized by their respective systems.

The proposed method of regulating the firing process can be implemented with standard equipment on any methodical kiln for firing ceramic products.

The use of the method is most effective for regulating the processes of firing ceramic tiles for floors, ceramic acid-resistant products and bricks in connection with the content of flux in the initial mass of the specified products.

The use of the regulation method has the following advantages: the alternation of changes in the supply of saturated water vapor and fuel consumption allows stabilizing the geometric dimensions of products within acceptable limits at a lower firing temperature, lowering the temperature of the heat carrier and increasing the service life of the equipment.

Claims (1)

Invention Formula The method of regulating the firing process, ceramic products, including temperature measurement in the zones of heating, firing and cooling, change in the flow of coolant when it deviates from the task and measuring Topaboibo F Gp Topaivo The furnace output, which differs in that, in order to reduce the cost of the heat carrier, the flow of saturated steam is measured, if the geometrical dimensions of the products deviate from the task, they alternately change in inversely proportional relationship between the flow of heat carrier or saturated steam to the burning zone ; the geometrical sizes of the products stabilize the flow of coolant and saturated steam.  11 isj fi ffiRffl 14 neither t.MM, J fli fff o 152- 6.3. t H.3. t 950 10QO U50 1100 Figg r: c