KR100865307B1 - Method for estimating inclined angle of gas holder piston - Google Patents

Abstract

The present invention relates to a method for determining the tilt angle of a gas holder piston, comprising: installing an ultrasonic level meter in a symmetrical form of east, west, north and south inside a gas holder for controlling supply and demand of BFG; Setting a level gauge symmetry reference point based on a standard state of the seal oil in the gas holder; Connecting power supplies, signal transmitters, control systems, and displays to the respective ultrasonic level meters to maintain energization, measurement, arithmetic, and analysis; It includes a process of obtaining the angle of the piston inclined according to the level rise and fall of the seal oil and the wear of the seal rubber by the following equation of the trigonometric function derived from the Pythagorean theorem.

(expression)

Tilt angle of the piston = COS ^-1 (COS A ')

(COS A 'is the value measured by each ultrasonic level meter, and the base side of the right triangle is divided by the hypotenuse, where A' is an arbitrary angle determined when the hypotenuse and the base side are fixed to constant values.)

According to the present invention, it is possible to estimate the consumption time of the seal rubber by installing an ultrasonic level meter on the inner wall side of the gas holder and continuously measuring the change amount of the tilt relative to the tilt reference point of the piston.

Description

Tilt angle determination method of gas holder piston {METHOD FOR ESTIMATING INCLINED ANGLE OF GAS HOLDER PISTON}

1 is a block diagram showing the blast furnace gas distribution relationship by a general gas holder,

Figure 2 is an exemplary view showing a tilt measurement process of the piston in the gas holder according to the prior art,

Figure 3 is a cross-sectional view showing a side wall of the piston in the gas holder with an ultrasonic level meter of the present invention,

4 is a plan view of a gas holder equipped with an ultrasonic level meter of the present invention;

Figure 5 is a block diagram for determining the inclination angle of the piston by the seal oil transmission and control system according to the present invention,

6 and 7 are conceptual views showing the correlation between the level of the seal oil and the piston for explaining the present invention.

Explanation of symbols on the main parts of the drawings

1 .... gas holder 2 .... piston

22..Holder side wall 24 .... Seal oil

25 .... Seal rubber 29 .... Piston side wall

106..Eastern level meter 107 .... West level meter                 

108..South Level Meter 109 .... North Level Meter

117 ... Display

The present invention relates to an inclination angle determination method of a gas holder piston provided with an ultrasonic level meter on the inner wall side of the gas holder and continuously measuring the change amount of the inclination relative to the inclination reference point of the piston to predict the consumption time of the seal rubber.

In general, blast furnace gas (hereinafter referred to as "BFG (BLAST FURNACE GAS)") produced in the process of producing molten iron is recovered and used as a heat source in power plants, coke plants and hot-rolled furnaces.

The BFG is collected and supplied to the gas holder to be supplied and managed. In the related art, as illustrated in FIGS. 1 and 2, the gas holder 1 is often adjusted by adjusting the level of the gas holder 1 according to the amount of BFG used. The vertical movement is performed, and the piston 2 also flows up and down according to the amount of gas.

At this time, the piston 2 is connected to the piston side wall 29 and is connected to the seal rubber 25 by the support 28 is configured to be floating on the seal oil 24 therein.

The seal oil 24 is to be managed so that a certain level is maintained. Since the seal oil 24 is consumed between the holder side wall 22 and the seal rubber 25 by the vertical movement of the gas holder 1, its consumption is Should be supplemented from time to time.                         

However, the repetition of the up and down movement of the piston 2 causes the consumption of the seal rubber 25 to be fast, and the piston 2 is inclined when the piston 2 is abnormal or the seal oil 24 is abnormal. It is difficult to control the supply and demand of the BFG is not maintained smoothly.

In order to prevent such a phenomenon, the operator installs four visual measurers 21 on the piston side wall 29 and checks for a month, and goes down by a lift in the upper part of the gas holder 1 via the air layer 13. After checking and recording the following four levels, the inclination of the piston 2 and the consumption state of the seal rubber 25 were determined based on the recorded levels of the seal oil 24 to determine the replacement time.

However, in the process of judgment by manual operation, the measurement cycle is long, and the wear cycle of the seal rubber 25 cannot be grasped quickly and accurately. Not only did it cause a waste of resources that need to be dissipated, but it also caused an accident.

The present invention was devised to solve the above problems, and installed in a symmetrical form so as to face an ultrasonic level meter capable of measuring the ipsilateral level, the western level, the south level, and the north level on the piston side wall connected to the piston, and the reference point of the piston tilt. After setting the oil pressure, the piston tilt angle according to the rise and fall of the seal oil is continuously measured to determine the abnormal tilt of the piston that occurs during the water distribution process of the BFG. It is an object of the present invention to provide a method for determining an inclination angle of a gas holder piston that can be easily determined.

The above object of the present invention, the process of installing an ultrasonic level meter in the symmetrical form of the north-west, north-west inside the gas holder to control the supply and demand of the BFG; Setting a level gauge symmetry reference point based on a standard state of the seal oil in the gas holder; Connecting power supplies, signal transmitters, control systems, and displays to the respective ultrasonic level meters to maintain energization, measurement, arithmetic, and analysis; Determination of the inclination angle of the gas holder piston comprising the step of obtaining the angle of the piston inclined according to the level rise and fall of the seal oil and the wear of the seal rubber by the following equation of the trigonometric function derived from the Pythagorean theorem. By providing a method.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

Referring to FIG. 3, the piston 2 is positioned at a distance from the circular holder side wall 22, and the seal oil 24 maintains a constant level between the holder side wall 22 and the piston side wall 29. A non-contact ultrasonic level meter 104 capable of measuring the level of the seal oil 24 is along the symmetry lines 150 and 151 to the east, west, south and north of the gas holder 1 as shown in FIGS. 4 and 5. The ipsilateral level meter 106, the west level meter 107, the south level meter 108, and the north level meter 109 are respectively provided so as to continuously measure the oil level.

Each of the level gauges 106, 107, 108, and 109 is connected to the power supply 112 by the level gauge cable 111 and is configured to be operated by being supplied with power.

The measured level is input to the control system 115 through the transmission cable 113 amplification signal transmitter 114, and is digitally changed to enable data transmission by the monitor 117 and the optical cable 116 which can be monitored. Networked.

The display 117 is provided with an alarm so as to make an alarm output 121 when it is out of the setting value, the screen is configured so that the slope of the piston 119, the seal oil level 120 and the like can be displayed.

6 and 7, in order to predict the piston tilt as the level of the seal oil rises and falls, a certain amount of the seal oil 24 is horizontal to the inclination of the piston bottom 153 in which the oil is stored when the inclination of the piston changes. As the level is increased, the hypotenuse (c, c`) is formed between the ipsilateral level meter 106 and the western level meter 107 based on the symmetry reference point (A) of the level gauge, making a reference point 100 for the piston tilt. The height (a, a`) is defined between the highest point (103) and the lowest point (101) of the seal oil level based on the piston tilt reference point (100), and the ipsilateral and western level gauges of the level reference point (A) ( The base side (b, b`) is defined between 106 and 107).

Therefore, cos (A ') = base / hyperside A' by the symmetry reference point A through the Pythagorean theorem based on the right triangle of the formed base side (b), height (a), and hypotenuse (c). The angle of inclination of the piston we want can be obtained from the generalized equation of the general angle (Θ) = cos ^-1 (cosA).

That is, since the base, hypotenuse, and height values that are variable through each level meter can be known, the cosine value (even if the angle is not known) for the angle at that time can be obtained. By substituting, the actual angle can be obtained.

Although this is described above, it is possible only under the condition that a right triangle is formed, and in fact, the present invention always forms a right triangle with respect to the symmetry reference point A.

In addition, the base side (b`), the height (a`), the hypotenuse (c`) can also be obtained through the same process. At this time, the obtained tilt angle of the piston can be changed to the actual value by multiplying the obtained value by-.

These are shown schematically in Table 1, an example of the measurement is shown in Table 2.

In addition, the change in the inclination angle of the calculated piston is shown graphically in Table 3.                     

That is, the inclination continuous measurement and the angle determination unit which continuously determine the angle by determining the slope (cosA) based on the correlation graph between the level and the piston, and the upper limit point of the piston slope around the reference point 100 of the piston slope calculated in FIG. 6. (PH) and a lower limit PL are set so that an oblique line is formed between the height a and the height a` around the level system symmetry reference point A.

At this time, the piston bottom 153 is the same as the lowest point 101 which is the zero seal oil point when the piston 2 is normal, but when the piston 2 is inclined to form a slope of the piston from the west side to the east side (a ) Increases so that theta angle (Θ) increases and the opposite height (a`) decreases so that theta angle (Θ ') decreases.

By assigning the inclination reference point 100 to the level gauge operating in the opposite direction to the inclination of the piston, a right triangle of the base side (b), the height (a) and the hypotenuse (c) is generated even at the level system symmetry reference point (A) = cosA. The slope can be calculated from the equation Θ) = arc cosine (cosA).

On the other side of the level decline, a right triangle with base (b`), height (a`) and hypotenuse (c`) is formed, and after the normal angle (Θ`) = arc cosine (cosA) is extruded, the slope angle -Θ).

Referring to the operation of the present invention configured as described above are as follows.

The ultrasonic level meter 104 installed symmetrically in the east, west, south and north receives power from the power supply 112 without contacting the seal oil 24 stored between the piston 2 and the holder side wall 22. The level of the seal oil 24 is measured by the ipsilateral level meter 106, the western level meter 107, the south level meter 108, and the north level meter 109, which are symmetrically installed, and are controlled through the control system 115 and the display 117. Finally, it is possible to analyze the level of seal oil, and to analyze the trend of gas holder and piston with piston slope applied.

That is, in order to induce the inclination angle by the ultrasonic level meter 104 registered in the display 117, as shown in the graph for predicting the piston tilt according to the rising and falling of the seal oil level of FIG. 6, the piston tilt reference point 100 If the estimated angle of inclination of the piston (2) is the highest point of the seal oil level, a triangular symmetrical angle between the symmetric ipsilateral level gauge (106) and the western level gauge (106) centers around the level gauge symmetry reference point (A). This straight triangle can be calculated by deriving the inclination angle Θ from Table 1 and substituting it into the equation.

As shown in Table 2, after setting the tilt angle of the piston in the continuous measurement table, the upper limit PH and the lower limit PL for the tilt angle of the piston 2 are set to the continuously varying heights a and a. After making Table 2, apply the general angles (Θ) and (Θ`) for the triangles symmetrically created at the level symmetry reference point (A) to the inclination of the gas holder (1) and the piston (2) used in the current steel mill. When the inclination angle Θ by the level is obtained and the inverted angle is inverted to finally determine the inclined piston bottom 154, the inclination angle of the piston is finally known.

By monitoring such a situation in real time through the display 117, it is possible to easily observe the change in the tilt angle of the piston, thereby making it possible to sufficiently predict the wear state of the seal rubber.

As described in detail above, the present invention by continuously monitoring the inclination angle of the piston it is possible to know the piston shake due to the abnormal viscosity of the seal oil and the piston shake due to the unbalance of the gas storage layer to avoid large accidents of equipment In particular, it is possible to predict the wear degree of the seal rubber generated due to continuous friction with the holder side wall during gas ascension and descending, and thus it is possible to accurately determine the replacement time.

Claims (2)

Installing an ultrasonic level meter in a symmetrical form of east, west, north and south in a gas holder for controlling supply and demand of BFG; Setting a level gauge symmetry reference point based on a standard state of the seal oil in the gas holder; Connecting power supplies, signal transmitters, control systems, and displays to the respective ultrasonic level meters to maintain energization, measurement, arithmetic, and analysis; Determination of the inclination angle of the gas holder piston comprising the step of calculating the angle of the piston inclined according to the level rise and fall of the seal oil and the wear of the seal rubber by the following equation of the trigonometric function derived from the Pythagorean theorem. Way. (expression) Tilt angle of the piston = COS ^-1 (COS A ') (COS A 'is the value measured by each ultrasonic level meter, and the base side of the right triangle is divided by the hypotenuse, where A' is an arbitrary angle determined when the hypotenuse and the base side are fixed to constant values.) The method of claim 1, After calculating the inclination angle of the piston, the wear degree of the seal rubber corresponding to the calculated value is measured and tabulated, and the replacement timing of the seal rubber is determined according to the inclination angle of the piston measured based on the table. Tilt angle determination method of the gas holder piston.

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