SU1456225A1 - Method of automatic control of grate cooler - Google Patents

Abstract

The invention relates to the control of the Kolesnikov cooler, can be used in the building materials industry, in the chemical industry and allows for an increase in the quality of control. To achieve this goal, the air supply to the second chamber is changed to stabilize the ratio of pressure values in the chambers at the stabilized value, change the air supply to the first chamber depending on the deviation of the measured air flow rate to the first chamber from the specified value and change the speed of the cooler grates depending on the deviation of the air in the first chamber from the given value. 1 il.

Description

The invention relates to the management of a grate cooler and can be used in industry; construction materials, in the chemical industry, in ferrous and non-ferrous metallurgy and other industrial fields.

The purpose of the invention is to improve the quality of control.

The essence of the method is as follows.

The nature of the dependence of air flow through the lattice of a refrigerator with a layer of clinker on it is similar to the nature of dependence for constriction devices. Last looks

iP with G, (1)

where DR is the difference in air pressure

under and above the fridge grill;

G - air flow through the layer

clinker ;. c is a coefficient proportional to the coefficient

The value of C in expression (1) is a function of many variables, but is determined largely by the height of the layer of clinker on the grate, and its grain size distribution.

In the physical sense, C is the gas (air) permeability of the clinker layer.

The pressure P under the gratings of the refrigerator is one to two orders of magnitude greater than the pressure above the grate. Furthermore, it is usually 1-5 mm of water column and is kept stable. . Practically, it can be taken equal to atmospheric, and the value of the pressure difference dP on the grid is replaced in

"(: P1

About 1h9 1C

sd

3, 1А56225

I (About the pressure P under the lattice (in the chamber).

Then the expression (I) can be rewritten by replacing dR with P:

(2)

.

G;

where 1 is the camera number.

In the method, two values from three expressions (1) are stabilized - air pressure P and air flow rate G.

This ensures the stability of the third, key parameter — the gas permeability (C) of the clinker layer on the grid.

By controlling the refrigerator, a layer of clinker with a stable

are controlled air supply to the first two chambers of the refrigerator. If necessary, control the air supply to the third and subsequent chambers (if the refrigerator has more than three chambers) j they should be equipped with control and regulation means similar to the second chamber. Similarly

air must also be provided. At the same time, the lag time determined by block 7 must be individual for each: camera.

The automatic control system works as follows.

In the established control mode, a layer of clinker is formed on the lattices of the refrigerator, which provides

35

gas permeability. Gas measure 20 operates the permeability regulators 4, 6, and 9, which is the ratio of P and G according to (2). In this case, the first chamber of the refrigerator can be considered as a physical model of the entire refrigerator. The cooling conditions of the clinker formed above the first chamber are maintained for the second and subsequent chambers. With this, the larger the clinker, the longer it stays in the refrigerator, i.e. the degree of cooling of clinker depends less on the average size of its granules. These facts explain the increase in the efficiency (K1Shch) of the refrigerator while at the same time

this indicator.

 ,

The drawing shows a block diagram of an automatic control system implementing the method.

The system contains pressure sensors 1 and 2, respectively, in the first and second chambers.

The air flow stabilization circuit in the first chamber consists of an air flow sensor 3, which is connected via a regulator 4 to a gate 5 on the air supply line to the first chamber. The inputs of the pressure regulator 6 in the second chamber are connected to the output of the delay unit 7 and the pressure sensor 2 in the second chamber, and the output to the gate 8 on the air supply line to the second chamber. The input of the regulator 9 for stabilizing the pressure in the first chamber is connected to a pressure sensor j and the output to electric drives 10 and 11.

The diagram shows the essence of the method using an example when

in the nominal range. At the same time, the air flow rate supplied to the first chamber, the pressure in the first chamber and the pressure

25 in the second chamber are equal to the corresponding specified values.

When increasing, for example, the average size of the clinker pieces, the pressure in the first chamber decreases, because

30, the gas permeability of the clinker layer will increase. The air flow to the first chamber will increase.

At the same time, the signal from sensor 1 is reduced as well. the signal of the air flow sensor 3 will increase. In response to the indicated signal, the regulator 9 will begin to decrease the speed of the grids on the actuators 10 and P, the regulator 4 will begin to close the gate. After a time of transients in the pressure regulation system in the first chamber and air flow to the first chamber will return to the specified values.

dd PIT new steady state, but the height of the clinker layer is already greater, and the opening degree of gate 5 is lower than in the previous steady state. As a result, the residence time of the clinker in the cooling zone will increase, the gas permeability of the clinker layer will return to its previous value. The amount of heat removed from the clinker and returned to the kiln returns to its former value.

With sharp and severe disturbances acting on the pressure control system in the first chamber, pressure fluctuations may occur in the first chamber.

40

50

regulates the work of regulators 4, 6 and 9

in the nominal range. In this case, the flow rate of the air supplied to the first chamber, the pressure in the first chamber and the pressure

in the second chamber they are equal to the corresponding given values.

When increasing, for example, the average size of the clinker pieces, the pressure in the first chamber will decrease, since

the gas permeability of the clinker layer will increase. The air flow to the first chamber will increase.

At the same time, the signal from pressure sensor 1 decreases as well. the air flow sensor 3 signal will increase. In response to the indicated signal change, the regulator 9 will begin to decrease the speed of the grids, acting on the actuators 10 and P, the regulator 4 will begin to close the gate 5, After a time of transients in the pressure control system in the first chamber and air flow to the first chamber will revert back to the set values.

PIT is a new steady state, but the height of the clinker layer is already greater, and the degree of opening of the gate 5 is lower than in the previous steady state. As a result, the residence time of the clinker in the cooling zone will increase, the gas permeability of the clinker layer will return to its previous value. The amount of heat removed from the clinker and returned to the kiln will also return to its previous value.

With sharp and strong disturbances acting on the pressure control system in the first chamber, pressure fluctuations may occur in the first chamber.

us At the same time, after the delay time T, the output signal of the delay unit 7 will similarly begin to change.

Consequently, after a while, the calculated pressure value for the second chamber will start to change (Task).

If the first chamber has a decrease in pressure, then the value calculated for the second chamber is well. on pressure, the time will begin to decrease. Regulator 6 will begin to reduce the degree of opening of the gate 8. 15 second chambers, setting the ratio

This reduces the pressure of air pressure in the second chamber to

bake.

The system of automatic control of the grate cooler will ensure the stability of the furnace, reducing the specific fuel consumption for clinker burning,

Claims (1)

10 claims The method of automatic control of the grate cooler includes the measurement of air pressure in the first spirit and in the second chamber. When the pressure in the first chamber increases, an automatically controlled pressure increase will occur in the second chamber, but after a time T, when manually increasing the value of the given pressure to the regulator 9, the setpoint will automatically increase to 6 after a time C, A reduction in the size of the granule granules will cause an increase in the speed of the fridge lattices, a decrease in the residence time of clinker in the fridge. the air pressure in the first chamber, taking into account the time of transport delay of the material and the change in supply 20 air into the second chamber until the ratio of the air pressure in the second chamber to the air pressure in the first chamber reaches a predetermined value, characterized in that 25 in order to improve the quality of control, the flow rate of air in the first tank is measured. measure, change the air supply to the first chamber and change the velocity of the sieve the current of the refrigerator, and the change Reducing the amount of clinker, through-30 supplying air to the first chamber of the furnace (as is known, the clinker depends on the deviation, the core leaves the furnace in waves), will slow down the speed of the grids and deeper cooling of the clinker . Increasing the amount of clinker will cause an increase in the speed of the grids.  These situations provide the necessary cooling of the clinically measured amount of air flow into the first chamber from a predetermined value, and the change in the speed of the cooling lattices is dependent on the deviation of the air pressure in the first chamber from the predetermined value. second chambers setting the ratio bake. The system of automatic control of the grate cooler will ensure the stability of the furnace unit, reducing the specific fuel consumption for clinker burning, Invention Formula A method for automatically controlling a grate cooler comprising measuring air pressure in the first and the air pressure in the first chamber, taking into account the time of transport delay of the material and the change in supply air into the second chamber until the ratio of the air pressure in the second chamber to the air pressure in the first chamber reaches a predetermined value, characterized in that In order to improve the quality of control, the air flow rate in the first booster is measured. measure, change the air supply to the first chamber and change the speed of the sieve; the current of the refrigerator, and the change in the air supply to the first chamber is made depending on the deviation the measured value of air flow in the first chamber from a predetermined value; And the change in the speed of the chiller grids is carried out depending on the deviation of the air pressure in the first chamber from the predetermined value.