JPS5965743A - System for detecting breakage of blast furnace tuyere - Google Patents

Abstract

PURPOSE:To seize rapidly and exactly a breakage state of blast furnace tuyere by holding the data of differential flow rate e.g. during past 10min and by recording the held data at a speed higher than that of usual recording when the differential flow rate data exceeds the prescribed value. CONSTITUTION:A supplying water flow rate and draining flow rate of each tuyere 13 are detected by flowmeters 11, 12 and are inputted to an arithmetic control part 20. An input treatment part 21 reads the signals at a predetermined speed while selecting them successively. A file 22 always holds e.g. the data in part 10min while renewing the data one by one. An integrating value arithmetic part 23 integrates the differential flow rate data of n times. If at least one of this integrating value and the present value of flow rate difference obtained from the file 22 exceeds the predetermined value, it is notified to an operation control part 24 and a record control part 26 from a data monitoring part 25. The part 26 reads out the past 10min data from the file 22, and the data of past 10min are recorded by a recorder 15 at the higher speed than usual.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention provides a plurality of (
30 to 40) relates to a system for detecting damage to a tuyere.

In general, damage to the air blower for blowing hot air into the blast furnace not only forces the blast furnace to temporarily stop operating.
Because it may sometimes lead to a serious accident,
Cooling water is supplied to this to prevent damage, but if damage should occur, it is desirable to be able to notify the user quickly and accurately.

FIG. 1 is a schematic diagram showing a conventional panel damage detection system.

In Fig. 1, 11 is a water supply flowmeter, 12 is a drainage flowmeter,
2 is a calculator, 3 is a monitor switch, 4 is an indicator, 5#,
1-0 set. That is, the flow rate side 1 is determined by the computing unit 2.
The water supply #r, t, which is the measurement fish of No. 1, and the flow meter 12
Calculate the difference between the measured value of the drainage flow rate and monitor switch 3. Damage to the siding is detected by indicating or recording with the indicator 4 or the recorder 5. In other words, damage to the siding is detected from the differential flow force 1 between the water supply flow rate and the drainage flow rate, that is, the amount of water leakage. It is.

According to this method, the computing unit depends on the number of tuyeres.

Monitor switch: A recorder, etc. is required, but as mentioned above, the number of tuyeres can reach 30 to 40, so there is a drawback that not only the size of the instrument panel but also the installation space is large. In order to determine the cause of the damage to the blades, data before the damage is required, and therefore the recorder must be kept in operation at all times, making maintenance of the 73 self-recording paper troublesome. Fig. 2 is a graph showing how the differential flow rate changes over time. In other words, (A) in the same figure shows a case where the differential flow rate suddenly exceeds the predetermined report level due to siding damage. (B) is a case where the differential flow rate temporarily exceeds the standard level, and (C)
This is a case where the difference Mitt distribution fluctuates, and in order to determine the location or cause of tuyere damage from such various data, it is necessary to record past data.

In addition to this method, for example, a method using a calculator may be considered, but the problem with such a method is that the system would be large-scale and expensive.

The present invention was made under these circumstances, and it is an object of the present invention to provide a system that can quickly and accurately obtain the information necessary for determining the state of siding damage at a low cost.

The feature is that it is installed corresponding to multiple blast furnace tuyeres, detects the inflow and outflow amount of cooling water supplied to the tuyeres, and sequentially processes the detection output with a microcomputer. The differential flow rate between the inflow and outflow amounts is calculated, and the resulting data, for example, for the past 10 minutes, is retained, and when the differential flow rate data exceeds a predetermined setting of 1 shift, an alarm is issued and the data is not retained. By recording data for the past 10 minutes at a speed much faster than the normal recording speed, the state of damage to the blast furnace tuyere can be quickly and accurately determined.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 is a block diagram showing an embodiment of the present invention.

In the figure, 11 and 12 are water supply and drainage flowmeters similar to those in Figure 1, 13 is a blast furnace lining, 14 is an operator console, 15 is an operator console, and 20 is a control device such as a microcomputer. Input processing j41
';'Is 21, file (memory) 22, integration jb
l operation capital 23, opcon control section 24, data monitoring section 25
'M and record 101' phloem 26 meyoshi (jq formation.

Is the supply flow rate of the cooling water that cools each tuyere 13 and the water flow rate 91? : Detected by a total of 11 and 12 and input to the calculation control section 20. Input processing unit 2 of calculation control unit 20
1Fi each +5tj JK total 11. Signals emitted from 12)) [Select sequentially at a constant speed and then input n1L. In order to average the read data for each tuyere 4υ of y, 4, and 4v, the read data is added a predetermined number of times (for example, 5 times) and stored in the memory (file) 22. Input processing section 21
Next, an average value is calculated for each of the added data, and a difference flow rate between the inflow amount and the eIC output signal is calculated and stored in the memory (file) 22. In addition, if necessary, perform instrumental error correction and base full-scale value tube correction. The file 22 continuously updates the data calculated in this way, and always holds data for the past 10 minutes (511).

This is based on the empirical rule that when a tuyere breakage occurs, data from the past 10 minutes is required to investigate the cause. 1r in the integrated value calculation unit 23
i, n (appropriately set) times of differential flow rate data stored in the file 22 are integrated. This integrated value and the current envelope value obtained from the file 22 are the data monitoring unit 2
At step 5, the upper and lower limit set values of //l are compared, respectively, and if at least one of these values exceeds the set ni, the opcon control section 24 and the recording control section 26 are notified. When the recording control unit 26 receives the notification, it reads out the past 10 minutes of data from the file 22, and also changes the recording speed of the recorder 15 to a speed (20[ +117L/win), the recorder 15 records data for the past 10 minutes at a faster speed than usual.

It goes without saying that the speed will return to normal after that.

On the other hand, upon receiving the above notification, the opcon control unit 24 performs a predetermined process and causes the opcon 14 to display the winning number. In addition, by operating the OBEKO/14, it is possible to record data related to any desired turn.

As described above, the present invention provides the advantage that information necessary for determining the state of siding damage can be obtained at low cost and at high speed. Also, CRT (cathode ray tube)
It is possible to obtain data at low cost, in a format that is easiest for the supervisor to judge, and which is also storable, without using expensive output equipment such as .

The present invention is not limited to the blast furnace tuyere damage system described above, but can be applied to leakage detection systems in various cooling systems.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a conventional panel damage detection system, FIG. 2 is a graph showing temporal changes in differential flow rate, and FIG. 3 is a configuration diagram showing an embodiment of the present invention. Description of symbols 11... Water supply flow meter, 12... Drainage flow meter, 2-... Arithmetic unit, 3... Monitor switch, 4... Indicator, 5.1 recorder, 13...blast furnace tuyere, 14...operator console (operator), 20...calculation such as microprocessor Control device, 21...
Input processing unit, 22... File, 23...
...integrated value calculation section, 24...operation control section,
25...Data Monitoring Department, 26...Record Control Department Representative Patent Attorney Akio Namiki Patent Attorney Kiyoshi Matsuzaki Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A detection means is provided corresponding to a plurality of windows installed in a blast furnace and detects an inflow flow rate and an outflow flow rate of cooling water supplied to the windows, and a detection means that sequentially reads the detection output and determines the inflow flow fit for each window at least. a calculation means for calculating the flow rate difference between the flow rate and the outflow flow rate, and a storage means for sequentially refreshing the flow rate difference data at a constant time and retaining it for a constant time.
A monitoring means for monitoring the results of the M calculations, and when the result of the monitoring exceeds the set value of the calculation 1, the data stored in the storage means is stored in F3 [fixed amount of data at a normal recording speed. A method for detecting damage to a blast furnace tuyere, comprising: recording control means for recording at an even faster speed, and detecting the state of damage to the blast furnace tuyere from the recorded results.