KR100413285B1 - Automatic control method of sintering speed - Google Patents

Abstract

The present invention relates to a method for automatically controlling the speed of a sintering machine, comprising: calculating a sintering completion time of a current operating condition using a temperature and a negative pressure measured by a thermometer and a negative pressure gauge installed in a windbox of the sintering machine; Obtaining a flame speed (F.F.S) by the obtained sintering completion time; Calculating an actual sintering completion point and calculating a deviation value for the target sintering completion point; Obtaining a corrected sintering speed by the deviation value and the parameters (sintering completion point, aeration rate, exhaust gas amount, exhaust gas pressure, post-layer, sintering speed); Controlling the speed of the sintering machine by the corrected sintering machine speed value has the advantage of controlling the speed of the sintering machine in an optimal state that will bring the maximum production without deterioration of quality in the production of sintered ore.

Description

Automatic control method of sintering speed

The present invention relates to a method for automatically controlling the speed of a sintering machine. Especially, in a DL (DWIGHT LOYED) type sintering machine capable of mass production, it is compounded on top of the sintering machine bed (BED) during sintering ore manufacturing process using lead and raw materials. The present invention relates to a method of automatically controlling the speed of the sintering machine to produce the sintered ore of the optimum quality in the process of manufacturing the raw material to the sintered ore.

1 is a process chart showing a general sintering operation, Figure 2 is a view for explaining a speed control method of a conventional sintering machine, as shown in Figure 2 generally the basic concept of the sintering machine speed control of the sintering machine 30 Sintering in the operation of firing blended raw materials while passing over 25 4 x 4M wind boxes (60) with 156 pallets of 4 x 1.5M on rails The speed | rate of the machine 30 is controlled, the effective image area of sintering in a sintering operation is 400 m <2>, and the length which a pellet advances and bakes is 100M.

How to control the speed of the sintering machine during the process of the sintering operation has a lot of influence on the production and quality of the sintered ore, and typically the factor that determines the speed of the sintering machine is the wind box 60 installed in the direction of the sintered ore; WIND BOX) It is temperature change inside.

Conventional speed control method of the sintering machine is a method of controlling the sintering machine speed by the manual (50a) by receiving the variable factor 50b, which is the equipment information 24 hours a day equipment information by wire or wireless or by monitoring the PCS monitor, whether in normal operation or abnormal operation state Because of this, there are the following problems.

First, as a manual speed adjustment method according to the temperature change of the wind box shown on the monitor, since the sintering machine speed is adjusted by arbitrary judgment based on the operator's experience and knowledge, there is a problem that it is insufficient to cope with timely production of sintered ore.

Second, since the driver manually controls the sintering machine speed with only a certain value indicated by the vent pressure monitor, there is a problem that the driver having insufficient experience and knowledge causes equipment trouble due to a miss.

Third, there is a shortage of timely response due to the lack of monitoring of the monitor, which causes the production loss and the deterioration of the quality of the sintered ore.

Fourth, since it is determined only by a simple value (wind box temperature, negative pressure, etc.) indicated by the monitor, the sintering machine speed is not controlled to an optimal state, and there is a problem that the sintering machine speed is controlled by a simple judgment of the driver.

The present invention has been invented to solve various problems of the conventional sintering machine speed control method in view of the above situation, and the tracking data such as temperature and pressure change and ventilation of the sintering machine speed control can be obtained. It is an object of the present invention to provide an automatic sintering speed control method for controlling the sintering speed in an optimal state that automatically controls the expected target sintering speed obtained using the sintered ore to produce maximum production without deterioration of quality.

1 is a process chart showing a general sintering operation,

2 is a view for explaining a speed control method of a conventional sintering machine,

3 is a view for explaining the present invention sintering speed control method;

4 is a flow chart of a sintering machine speed control according to the present invention.

<Description of Symbols for Main Parts of Drawings>

10: sintering bin 10a: sintering bed

10b: blended raw material 20: mixer

30: sintering machine 40: sintered ore

50: Sintering completion point 50a: Manual

50b: variable argument 60: windbox

Automatic sintering speed control method of the present invention for achieving the above object comprises the steps of calculating the sintering completion time of the current operating conditions using the temperature and the negative pressure measured by a thermometer and a negative pressure gauge installed in the wind box of the sintering machine; Obtaining a flame speed (FFS) by; Calculating an actual sintering completion point and obtaining a deviation value for the target sintering completion point as BTP deviation value = (100-actual BTP-target BTP); Obtaining a sintering speed corrected by; And controlling the speed of the sintering machine with the corrected sintering speed value.

In the present invention described above, the temperature and pressure change data obtained from the windbox 60 are transferred to the DCS and the PCS, and when the sintering completion time is determined, the driver combines the air volume, the ventilation, the sinter speed, and the like. The target burn-through point is set, and the estimated sinter speed is calculated in DCS and PCS, and then compared with the actual data every minute to compensate for the speed of the sintering machine. Is to control the optimal state.

Hereinafter, with reference to the accompanying drawings will be described in detail the automatic sintering speed control method of the present invention.

Figure 3 is a view for explaining the automatic control method of the sintering machine speed, sintering using the temperature obtained from the thermometer installed up to windbox # 20 ~ 27 and the negative pressure obtained from the negative pressure gauge installed up to windbox # 16 ~ # 27 A burn through time (BTT) is calculated (80). In other words, when the driver inputs a target value to be controlled, the sintering machine speed is calculated under the current conditions so that the control is automatically controlled by a feedback.

As shown in Fig. 3, the sintering completion point (BTP), the air permeability (80a.1) (80a.2), the amount of exhaust gas, the exhaust gas pressure, the layer thickness (80a.3), and the sintering velocity are input data. The sintering completion time (BTT) and air permeability values are calculated (80a), and the air permeability (80a.1) is calculated from the windbox. new) Sintering completion time and aeration rate calculation include sintering completion time calculation using deviation value, actual sintering completion time calculation using layer thickness, sintering completion time deviation calculation (80a) and sintering completion time calculation of windbox # 14 from the data obtained. (80), Calculation of the expected sintering machine speed is performed by calculating the sintering machine speed using the actual sintering machine speed and the sintering completion time, comparing the lower limit value and the performance value with the exhaust gas temperature, and sintering by the sintering machine speed and exhaust gas pressure by the bed sintering completion point. The air velocity calculation is included (80d).

The present invention is to control the speed of the sintering machine by the calculated data, the specific action is as follows.

In the first step, the sintering completion time (B.T.T; Burn Through Time) of the current operating conditions is calculated using a temperature and a negative pressure measured by a thermometer and a negative pressure gauge installed in the sintering machine windbox 60 (80).

The variable factor input data in the calculation of the sintering completion time are the calculated air permeability, the blowing air temperature, the blowing air pressure, and the windbox (# 20 to # 27) temperature. That is, the sintering completion time of the current operating condition is the value obtained by dividing the sintering completion time at the end of the sinter strand by the layer thickness.

The calculation of aeration from the windbox is as follows.

① The value obtained from the calculation air permeability (90) and the air permeability obtained at the sintering time point (80a.1)

Calculate deviation from value

② Old sintering completion time, old aeration degree deviation value and new sintering completion

Calculation of sintering completion time

③ Calculation of actual sintering completion time using after layer (80.3)

④ Calculation of deviation between sintering completion time of ② and sintering completion time of ③

⑤ PRECEDING Thermometer calculation

⑥ Sintering completion time of windbox # 4 from the data obtained in the above ③, ④, ⑤

Calculation

The flame speed (F.F.S; Flame Front Speed) is obtained from Equation 1 using the sintering completion time obtained above in the second step (80b).

In the third step, the actual sintering completion point (B.T.P; Burn Through Pont) is calculated and the deviation value for the target sintering completion time is calculated by Equation 2 below to obtain the sintering speed corrected by Equation 3 below.

The actual sintering completion point is calculated by substituting polynomial approximation using the temperature of windboxes # 14-27.

B.T.P deviation = (100-actual B.T.P-target B.T.P)

In the fourth step, the corrected sintering machine speed value is transmitted to the sintering machine TG so that the motor speed is changed, so that the sintering machine dml speed is automatically controlled. This value is also sent to the cab monitor so that the operator can monitor it.

The systematic calculation values from the first to the four steps are converted from PCS and DCS and transmitted to the cab monitor. When the sinter is started as shown in the sintering machine speed control flowchart of FIG. The speed of the machine is automatically calculated and displayed by the above-described first to fourth variables.

In addition, if the sintering machine is stopped during operation and more than 30 minutes have elapsed, the pre-stop speed value is applied. Otherwise, the sintering machine is operated at the calculated speed value and the sintering machine is optimally controlled.

As described above, according to the present invention, the automatic control method of the sintering machine speed inputs only a simple variable factor and compares the performance value with the conventional sintering completion time (BTT) using the tracking data in the method in which the operator manually controls the sintering machine speed. By accurately calculating the sintering completion point (BTP) and controlling the speed of the sintering machine, it accurately tracks the expected sintering machine speed and automatically controls the feedback to form the optimum operating conditions.

Therefore, there is an advantage that can control the speed of the sintering machine in the optimum state that will bring the maximum production without deterioration in the production of sintered ore.

Claims (1)

Calculating a sintering completion time of a current operating condition using a temperature and a negative pressure measured by a thermometer and a negative pressure gauge installed in the windbox 60 of the sintering machine; The flame rate (FFS) of the sintering machine Obtaining by; Calculating an actual sintering completion point (BTP) and obtaining the sintering completion point deviation value for the target sintering completion point as BTP deviation value = (100-actual BTP-target BTP); Calibrated sintering speed Obtaining by; And controlling the speed of the sintering machine with the corrected sintering machine speed value.