SU1083058A2 - Method of controlling process of firing material in furnace - Google Patents

Abstract

1. METHOD OF MANAGING THE PROCESS OF FIRING MATERIAL IN THE OVEN by author. St. No. 996838, which is based on the fact that, in order to improve the quality of firing, the amount of material in the furnace is determined, the value of which adjusts the set value of the temperature in the firing zone of the material.

Description

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PU9.J 2. A method according to claim 1, characterized in that the consumption of material in the furnace is measured, and the amount of material in the furnace is determined by the following relationship:

t

6- Qdt

t- € n

U

7

M

where Q is the amount of material in the furnace, t;

material consumption in the furnace,

t / h;

current time, h, material residence time

in the oven; the speed of movement of the material through the furnace, m / h

L furnace length, m

3. The method according to paragraphs. 1 and 2, characterized in that the average speed of movement of the material in the zones of the furnace is used as the speed of movement of the material through the furnace.

The invention relates to methods for controlling the roasting process in rotary kilns, for example, the roasting of datolite ore, and can be used in the mining industry.

According to the main author. St. No. 996838 discloses a method for controlling the process of burning a material in a furnace by varying the supply of fuel according to the magnitude of the temperature deviation in the burning zone of the material from a predetermined value, which varies with the speed of the material moving through the furnace 1.

However, the rate of movement of the material through the furnace does not determine the amount of material found in the furnace, on which the temperature conditions in the furnace depend, and consequently, the quality of calcination. The lack of control of the amount of material reduces the quality of firing.

For example, when managing the process of burning datolite ore according to this method, the degree of transition of boric anhydride from the acid-soluble to carbon-soluble form, which determines the quality of burning, is. 91-92%.

The purpose of the invention is to increase the quality of firing.

The goal is achieved according to the method of controlling the process of calcining the material in the furnace, which further determines the amount of material in the furnace, the value of which corrects the set value of the temperature in the zone of calcination of the material. . Moreover, the material consumption in the furnace is measured, and the amount of material in the furnace is determined by the following relationship: t

0 Qdi-

where Q is the amount of material found in the furnace, t; h - material consumption in the furnace,

five ,

g - the current time, h;

n time of material

in the oven, h | f4 material speed

across the furnace, m / h;

U -

furnace length, m. Moreover, as the speed of movement of the material through the furnace, the average speed of the material in the furnace zones is used.

FIG. 1 shows a block diagram. ma device that implements the proposed method; in fig. 2 is a graph showing the change in material consumption to the furnace (Q) over time t.

The device contains a rotary kiln 1, a sensor 2 of the temperature in the burning zone, a regulator 3, an actuator 4, a task block 5, {sensors 6-8 for the height of the material (or temperature), memory blocks 9-11, correlators 12 and 13, blocks

14 and 15 for determining the time of movement of the material, block 16 for determining the average velocity of the material moving through the furnace, block 17 for dividing the material flow sensor 18 into the furnace, integrator 19.

The method is carried out as follows.

The temperature in the burning zone is controlled by regulator 3, which compares the temperature signal from sensor 2 to the set value from step 5 of the task, and generates a control signal to the actuator 4 for fuel supply.

The temperature setpoint in the burning zone is varied according to the average movement speed of the material in the furnace zones (Vd) and the amount of material in the furnace (G)

With increasing (decreasing) Vjv and (or) increasing (decreasing) G increase (decrease) the given value of the temperature in the burning zone of the material.

To determine the average speed of the material Vd, the rates of movement of the material are determined in several, for example, two, zones of the furnace V, and

M-llV.).

To determine the V and V values of the material lift heights (or temperatures) in the first (H), second (H2) and third (Hj) cross sections of the furnace, measured by sensors 7-8, for example radioactive (or thermocouples), are stored in blocks 9-11. The correlators 12 and 13 determine the mutual correlation functions Rx (c) by the values that they choose from blocks 9–11.

)

The degree of transition of boric anhydride,%

91-92

The application of the invention will improve the quality of firing, which will increase the degree of transition boric anhydride.

R, (t) H, (t-t) dt-, o

RiUbYJ i- zU-Odt,

Where T is the observation time of the process; - variable time interval;

t is the current time. In blocks 14 and 15, by the position of the maxima and IR2 (2), the time from q and the movement of the material from the first to the second and from the second to the third cross section of the furnace is determined. In block 16, the calculation and V7 / c is performed as a quotient from dividing the distance between the first and second sections of the furnace into the distances between the second and third sections of the furnace by,. In block 16, the calculation of Vm is also performed as the average value of the velocities V;, j, and Vjy.

To determine the amount of material G in the furnace, the signal from the flow sensor 18 is fed to the integrator 19. As an integration limit, the integrator is also fed to the integrator

17, where the length of the furnace L is divided by the speed of the material V. The output of the integrator 19 is the signal

G odt

{-g „

Applied;: e way allows

when changing the fuel supply, take into account the amount and speed of movement of the material through the furnace, which will ensure optimal thermal conditions in the furnace

and improve the quality of firing material.

The table shows the results of the comparison of the base and the proposed object, which are determined according to the mathematical modeling of the process of burning datolite ore.

91.5-93

Increase by 0.5-1

0.5–1% and will give a saving of 0.5–1 RUR / t of calcium borate produced.

Claims (3)

1. METHOD FOR MANAGING THE PROCESS OF FIRING MATERIAL IN FURNACES by ed. St. No. 996838, which means that, in order to improve the quality of firing, the amount of material in the furnace is determined, the value of which corrects the set temperature in the firing zone of the material. □ about sl 1> 2. The method according to π. 1, characterized in that the consumption of material in the furnace is measured, and the amount of material in the furnace is determined by the following relationship: t ό = Qdt where Q is the amount of material j in the pack, t; Q - material consumption in the furnace, t / h; t is the current time, h; £ _p - time spent in the furnace; material speed in the furnace, m / h, ' B - the length of the furnace, m 3. The method according to PP. 1 and 2, characterized in that as the speed of movement of the material through the furnace using the average speed of movement of the material in the zones of the furnace.