JPH04198820A - Operation device of solid and liquid mixture within bath - Google Patents

Abstract

PURPOSE:To enable a solid weight change rate, weight, volume, and level value within a bath as well as liquid volume and level value to be measured accurately by performing calculation including each specific gravity between a solid substance and a liquid substance based on level and weight within the bath which is detected. CONSTITUTION:In the load cell 17, an output analog signal is converted into a weight value for calculating a weight of content within a dehydration bath and for inputting it to a solid weight operation part 38. Also, a water level is measured by a supersonic level meter 16, it is converted to a level value and dimension compensation adjustment is made, and then it is converted to an LV (level value-volume of content) and is fed to the operation part 38. A water-crash slug specific gravity and water specific gravity are input to the operation part 38 previously and a moving average processing and a filter processing are performed for a solid weight which is calculated from these values at a processing part 39. Then, a solid volume operation is performed and it is converted to a solid level value at operation parts 43 and 45. Also, moving average and solid volume output are processed at a differential processing part 41 for obtaining a solid change rate and further a solid volume which is output from the operation part 43 is subtracted from a volume within a dehydration bath, thus obtaining a liquid volume.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a calculation device for a liquid/liquid mixture in a tank, and in particular, a tank in which a solid substance in the form of a slurry is in a precipitated state and a liquid substance or solid/liquid mixture stagnates in the upper part of the tank is stored, such as a water tank. A calculation device for the solid/liquid mixture in the tank, which is suitable for use in detecting the volume, level, change state, etc. of each substance stored in the crushing and dewatering tank, such as granulated slag and water. do.

[Conventional technology]

When the molten slag (molten slag) discharged from the blast furnace together with the tapping is pulverized with pressure water or the like and rapidly cooled, so-called granulated slag is obtained. FIG. 3 represents a general process flow for obtaining granulated slag from the molten slag. First, this process will be explained. Molten slag 1 discharged from a tap hole of a blast furnace (not shown) is separated from hot metal by a skimmer provided in the middle of a hot metal trough. This molten slag is in a molten state (t
Well, it is charged into the blown box 2 of the granulation process.
In the step, the powder is cooled and pulverized by high-pressure cooling water, and then passed through a blowing gutter 3 and thrown into a stirring tank 4 . The cooled and crushed slag deposited in the stirring tank 4 is deposited in the form of sand. This accumulated slag is called granulated slag. Next, this granulated slag is transported as a slurry together with water from the stirring tank 4 using the granulation pump 5 and stored in the dewatering tank 6. In this dewatering tank 6, the granulated slag 14 is precipitated and deposited at the lower part of the dehydrating tank 6, and the water 15 stays above the granulated slag as a supernatant liquid.At the same time, the raw water is removed from the lower part of the tank 6. Since the water is discharged to the outside of the tank 6 through a screen 7 provided in the tank 6, dehydration is performed. The water that comes out of this dehydration tank 6 passes through a hot water tank 9 to a pump 10.
The water is sent to the cooling tower 11, cooled in the cooling tower 11, and retained in the cooling tank 12. Since this retained water is again used as cooling water in the blown box 2, the water supplied to the blown box 2 by the water supply pump 13 is a circulating flow of a series of water pulverization processes. In addition, in the dehydration tank 6, only the dewatering action proceeds from the time when the loading of the granulated slurry is stopped due to completion of one slag discharge or switching to another dehydration tank 6, and this dehydration action continues. When the process is completed, the dehydrated granulated slag 14 is transported out of the granulated slag process line from the bottom of the tank by a vehicle 8 such as a dump truck. Here, there are two important control management items in the water granulation process. One point is that the molten slag 1 carried into the blown box 2
The aim is to accurately grasp the amount of slag and control the water supply flow rate and water supply pressure according to the amount of slag. this is,! g.It is not a measure to prevent the slag from being insufficiently cooled due to an inappropriate amount of cooling water for one amount of molten slag, for example, it is too small, but by supplying an appropriate amount and pressure of cooling water. In order to ensure the quality of slag,
Furthermore, it has the meaning of saving energy in pumps (water supply pumps, fracking pumps, etc.). The core of this cooling water control is the detection of the amount of molten slag 1 carried into the blown box 2. At present, this detection method is estimated by measuring the occupied cross-sectional area and flow velocity of the molten slag 1 in the slag gutter upstream of the blown box 2, or by using an IT
V. There is a method of remotely monitoring and grasping the amount of molten slag flowing in using a (industrial television) camera. However, none of these methods allows for highly accurate detection; for example, the amount of molten slag can only be grasped to the extent that the heating of the blown box 2 is suppressed, and control management that takes quality or energy saving into account is not possible. In addition, the method using the rTV camera requires a person to constantly monitor the monitor TV, and it is highly dependent on the skill level of the person. Another point is the solid/liquid management in the dehydration tank 6. That is, changes in the amount of water in the dehydration tank 6 and changes in the production amount of granulated slag 14 are important factors from the viewpoint of operation and management of the dehydration tank 6. Therefore, the operation of the dewatering tank 6 is as follows: water 15 and granulated slag 14
It is necessary to operate in such a way that it does not overflow.
To do this, the dehydration tank 6 must be properly switched, and the water 1
5 and the amount of granulated slag 14 to predict the dewatering time,
From the driving instructions for the vehicle 8 to the payout schedule of the vehicle 8, 11
Is it necessary to do it at 14? In addition, with regard to operational pipe burying, it is necessary to reliably detect and manage the amount of product granulated slag. Is this essential for the operational management of the fracking process, and is it also necessary to check the balance between the amount of raw material input during blast furnace operation and the volume of pig iron and slag discharged, or the balance between the amount of hot metal and the volume of slag? is an important item to be detected. Now, to detect changes in the amount of water in the dewatering tank 6, a level meter such as a float type or an ultrasonic type has conventionally been used. In addition, to detect changes in the amount of granulated slag,
Hitherto, level meters of a sounding type or a combination of a weight and a float have been used (for example, Japanese Patent Laid-Open No. 55-112525, Japanese Patent Publication No. 55-109922, Japanese Patent Publication No. 60-47976). The disadvantage of such conventional level meters is that they are only used to detect the water level and granulated slag level; they do not directly detect the amount of water or granulated slag.
The problem is that the amount can only be estimated from the level. For example, since the surface of the granulated slag 14 is not necessarily horizontal, estimating the amount of granulated slag based on the level of granulation may lead to large errors. In particular, when water and granulated slag are in a mixed state during reception of granulated slurry, the boundary value between liquid and solid is not determined, resulting in very poor accuracy. In addition, changes in the amount of water contained in granulated slag during dehydration,
In other words, there is no way to determine the progress of dehydration. However, in order to prevent water and granulated slag from overflowing from the dehydration tank 6, conventional level meters such as float types are of a type that directly detects the level.
It can be said to be effective.

[Problem to be solved by the invention]

As described above, conventionally, there have been two major problems in operating a solid/liquid mixture, for example, a granulation process. One of the problems is that there is no effective detection technology that can accurately determine the amount of molten slag flowing into the blown box, and the other problem is that there is no effective detection technology that can accurately determine the amount of molten slag flowing into the blown box. There is no effective detection technology that can reliably grasp the changes in production volume of granulated slag and granulated slag. Therefore, in the past, it has been difficult to achieve sufficient operation in terms of quality, energy saving, operational management, and operational stabilization in the granulation process. In addition, it may be possible to estimate the blast furnace slag removal rate using Japanese Patent Application Laid-open No. 62-30645, which the applicant has already disclosed. Since it is not possible to detect other changes with this alone, it is not possible to adequately manage solids and liquids. I don't get it. The present invention has been made to solve the above-mentioned conventional problems, and includes, for example, the amount of molten slag flowing into the blown box in the granulation process, the changes in the amount of water in the dewatering tank, and the production amount of granulated slag. An object of the present invention is to provide a calculation device for a solid/liquid mixture in a tank that can reliably grasp the transition of the solid/liquid mixture in a tank.

[Means for Solving the Problems] The present invention provides a method for storing a solid-liquid mixture in which a slurry-like solid substance is in a suspended state and a liquid substance stays in the upper part of the solid-liquid mixture. a level meter for detecting the level in the tank, a weighing scale for detecting the weight of the mixture, and based on the detected level and weight in the tank, including the specific gravity of the surrounding substance and the liquid substance By calculating the weight change rate, weight, volume, and level of the body substance, as well as the volume and level of the liquid substance, and using the output values of the weight scale and level meter, The above-mentioned problem is solved by providing means for dimensional correction adjustment of these weighing scales and level meters in order to perform dimensional calculations. [Operation] The principle of the present invention will be explained below by taking as an example the general water pulverization process shown in FIG. 3 above. In the granulation process shown in Figure 3, an ultrasonic level meter 16 is used as a level meter to measure the highest level of the solid (granulated slag) and liquid (water) mixture, and A load cell 17 is used as a weight scale to detect the weight including the dehydration tank 6. Calculation of the rate of change, volume, and level of the solid (granulated slag), as well as the volume and level of the liquid, based on two sensors, a level meter 16, and a load cell 17, is performed by a calculation device configured as shown in FIG. In the arithmetic device that performs
Each calculation result is transmitted in the direction indicated by the arrow in the figure. First, the converter 31 converts into a weight value W a weight (analog value) signal output by the load cell 17 which detects the total weight of the liquid mixture including the dehydration tank 6. The weight value W is the first
It is transmitted to the calculation unit 32 of. The calculation unit 32 calculates the tare weight W of the dehydration tank 6 (in a state in which no solid or liquid is stored) based on the converted weight value W.
By dividing o (W-No), the content weight (solid and liquid) of the dehydration tank 6 is obtained ΣW. This content weight ΣW is input to the point weight calculation section 38. Further, the second conversion unit 33 converts the level value (analog value) detected by the ultrasonic level meter 16 into a level value L. Here, the load cell 17 and the ultrasonic level meter 16 are usually different types of sensors. That is, the load cell 17 measures weight,
The ultrasonic level meter 16 has almost no measurement lag and has high responsiveness.On the other hand, the ultrasonic level meter 16 measures the distance to the liquid level, and generally measures the distance due to the wave movement of the liquid level in the dehydration tank 6. To prevent hunting, use an ultrasonic level meter 1.
An integral element is placed inside 6. As a result, the measured value of the level meter 16 has a large measurement delay (tag), and therefore has low responsiveness. As described above, there is a large difference in dimension between the two values, the weight value W and the level value. Processing such dimensional differences as two-dimensional ones in calculations after the solid weight calculation section 38 involves a large error.
The two values must be aligned to the same dimension, so
The dimension correction adjustment is performed by the dimension correction adjustment calculation section 34. That is, in the present invention, the measurement progress is adjusted so as to make it the same dimension as the weight value W by adding correction to the upper level value where the measurement delay is large. In this case, it is possible to synchronize the weight value W with a level value with low responsiveness, but since this only causes a delay in detection, it is preferable to adjust the measurement lead. . The calculation contents of the dimension correction adjustment calculation section 34 will be described in detail later. Next, the level value after measurement advance adjustment in the dimension correction adjustment calculation unit 34 is added to the original measured value of the unadjusted level value at the addition point 35, and the level value is added to the original measurement value of the unadjusted level value to measure the liquid (water) deposited on the solid. You can get a level without any lag. The result of this addition is obtained as a liquid level output and is displayed on the output section 36 or output as a control signal. Further, the level value L(1) obtained as the liquid level output from the addition point 35 is input to the LV conversion M3,7. In the LV conversion section 37, the level value is converted into the dehydration tank 6.
Convert to the volume of the contents V(n+3). In this case, the conversion is performed using function 2 given in advance. This function does not have a linear proportional relationship because the dehydration tank 6 does not normally have a constant cross-sectional area from the bottom to the top. The content weight ΣW of the dehydration tank 6 and the content volume V of the dehydration tank 6 obtained by the first calculation unit 32 and the LV change [ff37, respectively, are input to the solid weight calculation unit 38. In addition, this calculation unit 38 has a known value of granulated slag specific gravity γS.
and the specific gravity γW of water, which is also a known value, are input in advance. The following equation (1) holds true for these multi-values. EW=rW-(V-ws/rs) 10ws...
(1) However, Ws is the weight of solid (granulated slag). If we expand this (1), we get equation (2), and the solid weight W
s can be obtained. Ws =7s −(ΣW−rvt −V) /rS −
rVI...<2> The obtained solid #weight Ws is processed by the moving average filter calculation unit 39
is input. The calculation unit 39 performs moving average processing and filter processing on the solid weight Ws to remove noise and stabilize it, thereby making it a more reliable value. The result of the calculation is displayed on the output section 40 as a solid (granulated slag) weight WS output, or is output as a control signal. Further, the output of the solid weight Ws which has been subjected to the filter processing etc. is processed by the differential processing section 41. That is, by calculating the rate of change, the rate of change in the solid weight Ws can be obtained. This is nothing but calculation of the inflow velocity of the molten slag 1 into the blown box 3 shown in FIG.
It cannot be denied that there is a transport time delay between the granulation pump 5 and the dehydration tank 6. The processing result of this differential processing section 41 is the solid state change rate output (
molten slag speed) and is displayed on the display section 42 or output as a # control signal. The solid weight Ws that has been subjected to the filling process is input to the solid volume calculating section 43, and the calculating section 43 calculates the solid weight corresponding to the weight fLWs from the input weight output Ws using the following equation (3). Obtain the volume VS. Vs = Ws /rs'-(3) where γS' is the apparent specific gravity of the solid in the liquid. This calculated solid volume Vs is displayed as a solid (granulated slag) volume by the output unit 44 or output as a #J damage signal. Further, this solid volume output is input to the solid level calculation unit 45, and the volume is converted into a solid level value (1) using a function included in the calculation unit 45. For this numerical value, an inverse function of the function of the LV converter 37 described above can be used. The result of this solid level value calculation is displayed from the output unit 46 as a solid level output, or is output as a control signal. The dehydration tank content volume V obtained by the LV converter 37,
The solid body NvS obtained by the solid body calculation section 43 is input to the liquid volume calculation section 47, and the calculation section 47 calculates the difference between them. This gives the liquid volume. The obtained liquid volume is displayed as a liquid volume value in the output section 48 or output as a control signal. For example, the dehydration state in the dehydration tank 6 can be monitored and determined in detail using this value. In the load cell component 49, the load cell 17 can be calibrated 6. Calibration is performed by adding dummy water;
This is done by leaving 0 blank and importing the O value that has been input in advance. To adjust the span, the dehydration tank 6 should be filled with water.
This is done by taking in the value of the weight IWα that has been input in advance as a binary value at that time. Further, the ultrasonic level meter 16 can be provided with various backup means to make the detected value accurate. That is, for example, dehydration W! The ultrasonic level meter 16 provided in 6
Because the dehydration WI6 is a sealed tank and is filled with steam, it is easy to pick up echoes and reflected sounds, and there are many malfunctions. Increase the proportion and amount of water input into tank 4 to bring the water to an overflow level in dehydration tank 6, and check the overflow level (maximum water level LI of the ultrasonic level meter) at that time.
llax). In such a granulated water system, although the liquid level may struggle, the solid weight W
Each output of s output, solid change rate output, solid volume output, liquid volume output, and solid level output can be made normal. By repeating the above process, the liquid mixture in the tank is calculated. Next, regarding the calculation in the dimension correction intersection section 34,
This will be explained in detail based on Figure 2. The level value of the ultrasonic level meter outputted from the level converter 33 is first subjected to a moving average calculation in the moving average calculation part 34-1. Next, the calculation result is subjected to differentiation processing by the differentiation processing section 34-2. That is, by calculating the change rate, the liquid change rate (II/min) can be obtained. This takes a positive value when the liquid level is rising, and a negative value when the liquid level is rising. Next, the performance of the differential processing section 34! The result is subjected to temporary delay filter processing by the filter processing unit 34-3 to suppress hunting of the differential value. Next, the result of the - time filter processing is input to the level correction conversion section 34-4. In the converter 34-4,
The input to this conversion unit 34-4, which performs level correction conversion by performing function processing on the filtered result, is the liquid level change rate (11/min), which is the filtered result. The output is a level correction value (1), and the meaning of this correction conversion was obtained through operational experiments.
The value that must be corrected (+) has a relationship with the liquid level change rate (1/min) as shown in the correction converter 34-4 in FIG. 2. Therefore, by converting this relationship into a function, In other words, if the liquid level change rate is positive and is in the rising process, the actual level is assumed to be a higher value and a positive level correction value is added.On the other hand, if the liquid level change rate (11/min) is negative If it is in the descending process, the actual level is assumed to be lower and a correction value is added to the negative level.With the above processing, correction is added to the level value where the measurement delay (laq) is large, and the weight value is Adjust the measurement progress (1ead) m to make it the same dimension as W. This allows solid weight calculation in the solid weight calculating section 38 shown in FIG. 1. Dimensional correction adjustment check shown in FIG. The check of the section 50 is performed by calibrating the level correction conversion function of the level correction conversion section 34-4. In the calibration of the level correction conversion function, first, the dehydration tank 6 is made empty. , only water is introduced at various input speeds, or is discharged out of the system at various arbitrary withdrawal speeds.At this time, the contents of the dehydration tank, which is the output of the Lv converter 37 shown in FIG. The volume MV' (actually, however, only the water volume) is compared with the liquid volume calculation result, which is the output of the liquid N calculation section 40, and if the deviation exceeds a certain value, an alarm is output. Calibration is performed using an alarm. If the level correction conversion function is correct, the two should match at any liquid level change rate (1/min), but if the level correction change function is 0, the latter is calculated including the weight element of the load cell 17, so
Naturally, slight deviations will occur. This allows the dimensional correction adjustment function to be calibrated. The present invention has the above-mentioned principle, and is capable of accurately and effectively grasping the amount of molten slag flowing into a blown box in a granulation process, for example, as well as monitoring changes in the amount of water in a dewatering tank and granulation. It is possible to reliably and effectively grasp trends in the production amount of slag.

【Example】

Embodiments of the present invention will be described in detail below with reference to the drawings. In this embodiment, the solid and
It is a liquid calculation device. First, the load cell 17 converts the output analog signal into a weight value W. The dehydration tank contents weight ΣW is calculated from the weight value W and inputted to the solid weight calculation section 38. Further, the water level is measured by the ultrasonic level meter 16 and converted into a level fiiL. Converted level fML
is subjected to dimensional correction adjustment, LV converted, and input to the solid weight calculation unit 38. Also, this liquid (water)
The level is displayed on the liquid level output section 36 and output as a control signal. The known values of granulated slag specific gravity γS and water specific gravity γW are input in advance to this solid weight calculation unit 38, and the calculation unit calculates the solid (granulated slag) weight from these values. (
2) Calculate using the formula. For the calculated solid weight Ws,
Moving average processing and filter processing are performed by the three processing units to remove noise and stabilize. This value is
When it is 0, it is displayed as solid weight WS output or output as a control signal. Moreover, the solid weight W after the moving average processing and the filter processing
A solid volume calculation is performed from s, which is further converted into solid level values in respective calculation units 43,45. The solid volume V value is output by the solid volume output unit 44, and the converted solid level value is output by the output unit 46 for display or as a control signal. This makes it possible to know the solids level in the stirring tank 4, which cannot be known directly. Further, the moving average and filtered solid volume output VS is processed by the differential processing section 41 to obtain the solid state change rate. This solid state change rate is considered to be the calculated inflow rate of the molten slag 1 flowing into the water surface 3. Therefore, the output unit 42 uses this calculation result as the solid state change rate.
or output as a control signal. In addition, the solid volume ■ output from the interbody calculation unit 43
is subtracted from the dehydration tank contents volume to obtain the liquid volume. This volume is displayed at the output section 48 or outputted as a control signal such as 0 or more at each output section 36, 40.
Using the values output at 42, 44, 46, and 48, it is possible to accurately monitor and judge the dewatering state in the dehydrator, the amount of product granulated slag, etc., and perform stable operation. In addition, in the above embodiment, the solid/liquid mixture was a mixture of granulated slag and water in a blast furnace, but the scope of implementation of the present invention is not limited to this, and the present invention is practiced on a mixture of solid and liquid candy. be able to. [Effect of the invention 1] As explained above, according to the present invention, in a tank containing a liquid mixture, the solid weight change rate, weight, volume, and
The level value, as well as the volume and level value of the liquid can be measured with high accuracy. Therefore, for example, it is possible to accurately and effectively detect the amount of molten slag flowing into a blown box in the granulation process, and also to reliably and effectively monitor changes in the amount of water in the dehydration tank and changes in the production amount of granulated slag. Can it be understood effectively? Therefore, by understanding the amount of molten slag flowing in, it is possible to prevent heating of the blown box, ensure stability of product quality, and achieve energy-saving operation of the granulation process. In addition, since it is possible to understand changes in water volume and trends in granulated slag production, it is possible to operate the dewatering tank appropriately, and to carry out appropriate operational management. can get.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of the configuration of the outstanding liquid performance device according to the present invention, and FIG. Figure 3 is a block diagram showing details of the dimensional correction adjustment section in the device. FIG. 2 is a flowchart including a partial diagram showing the process. 1... Molten slag, 2... Blown box, 3...
Blown gutter, 4... Stirring tank, 5... Granulation pump, 6... Dewatering tank, 7... Screen,
9... Hot water tank, 10... Hot water pump, 11
...Cooling tower, 12...Cooling tank, 14...
Granulated slag, 15... Water, 16... Ultrasonic level meter, 17... Load cell, 31...
Weight conversion section, 32... Dehydration tank contents weight calculation section, 33... Level conversion section, 34... Dimensional correction adjustment section, 35... Addition XA-36... Liquid level level output, 37.
・・LV conversion section, 38 ・・Solid weight calculation section, 3・
...Moving average filter, 4C...Solid weight output section, 41...Differential processing section, 42...Solid change rate output section, 43...Solid volume calculation section, 44...Solid weight output section, 45...Solid level calculation unit, 46...Solid level output unit, 47...Liquid volume calculation unit, 48...Liquid volume output unit, 49...Load cell configuration unit, 50...Dimension adjustment correction Check section.

Claims (1)

[Claims] (1) A level meter for detecting the level of the solid-liquid mixture in the tank in a tank containing a solid-liquid mixture in which a solid substance in the form of a slurry is in a precipitated state and a liquid substance stays above it; Based on a weight scale for detecting the weight of the mixture, and the detected level and weight in the tank, calculations are made including the specific gravity of the solid substance and the liquid substance, thereby determining the weight change rate and weight of the solid substance. , volume, and level, as well as a means for calculating the volume and level of a liquid substance; and a means for calculating the volume and level of a liquid substance; A calculation device for a solid/liquid mixture in a tank, characterized by comprising: means for performing dimension correction adjustment;