JPS61116288A - Detector for thickness of slag in vacuum suction type slag-removing system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention The present invention relates to a slag thickness detection device in a vacuum suction type slag removal system (hereinafter referred to as vs cleaner). This type of removal system that sucks up and removes waste water is constructed as shown in FIG. (1) is the ladle, (2) is the suction head held by the lifting drive arm (3) so as to be positioned above the slag in the ladle (1), and the suction head is connected to the slag separation outlet through the suction pipe (4). Attachment @ (5)
The slag separation and discharge device (5) is connected to a vacuum pump (7) via a steam condensing device (6). (
8) It is a silencer device.

Because of this connection, the molten slag on the molten metal is sucked in from the suction head (2) and immediately cooled by jet water, turning into sand and passing through the suction pipe (4) to the slag separation, discharge and recovery device (5). Sent. Slag separation outlet storage fig (5
), the granular slag and water are separated and released into a water tank and collected by a slag conveyor (9).

After separation, the remaining air containing a large amount of steam is sent to a steam condensing device (
After being cooled and condensed in step 6), it is released into the atmosphere.

As shown in FIG. 2, the position of the suction head (2) is such that the lifting drive arm (3) is moved by the cylinder 01)a2J so that the distance #H0 of the suction head (2) from the slug surface αO is constant. Currently, it is driven and controlled. Here, the reason why the suction head (2) is held at a distance r@H1 above the slag surface (10) is that in the past, the detection of the slag layer thickness A was not contaminated, so the molten metal surface (
(to) is unknown, and the position is controlled in this way to prevent molten metal from being sucked in by mistake. However, when the distance 111H1 is provided, there is a drawback that the slag suction efficiency is low.

Therefore, the slag layer thickness A is detected to recognize the position of the molten metal surface αj, and the suction head (
2) is held at a position above the distance H2 from the molten metal surface Oj,
It is possible to efficiently suction slag while preventing suction of molten metal.

Conventionally, as a method for detecting the slag layer thickness A, an electrical resistance method is known that utilizes the slight difference in electrical conductivity between slag and molten metal. This connects a pair of heat-resistant electrodes to the slag surface aO
It is immersed into the molten metal from above, and detects when the electrodes have reached the molten metal surface (0) by measuring the change in resistance value between the electrodes at that time.

However, such electrical resistance type cannot detect the molten metal surface 03 with high precision due to the small difference in electrical conductivity, so it is not used for position control of the suction head (2) as shown in Figure 3. It is something that cannot be done.

Furthermore, if the temperature of the electrode is not raised sufficiently before immersion, slag will adhere to the electrode, further deteriorating the detection accuracy.

SUMMARY OF THE INVENTION An object of the present invention is to provide a slag thickness detection device that is more accurate than the electric resistance type and can start measurement without raising the temperature of a warm body sufficiently.

The slag thickness detection device for the vacuum suction type slag removal system of the present invention gradually immerses a heat-resistant float from the slag surface soil treated by the vacuum suction type slag removal system toward the molten metal layer below the slag layer. The inflection point of the buoyancy change acting on the heat-resistant float is detected, and the position of the heat-resistant float at the time of detection of the inflection point is V! The present invention is characterized in that the slag layer thickness is determined based on the L'li'7 report, and that gas is released from the heat-resistant float to prevent unnecessary substances from adhering to the heat-resistant float.

An embodiment of the present invention will be described below with reference to FIGS. 4 to 7.

FIG. 4(a) shows the overall configuration of the slag thickness measuring device 11.

αυ is a heat-resistant float, αO is a lifting device that immerses the slag from above the slag surface qO toward the molten skin α at a constant speed V, and α force is a moment-free device whose fixed side is attached to the lifting body α frame with lifting device 1!0. type load cell, the block itself is loaded
Pal machine tank is configured. α9 is an extension pipe, the upper end is attached to the movable side of the load cell αη, and the lower end is the afl
A heat-resistant float 1lJ9 is attached. The handle is an elevating body (rotary encoder for detecting the position of the object, Q'fJ
is a processing device that calculates the slag layer thickness A by processing the buoyancy information (5) from the load cell αη and the position information (L) from the rotary encoder (a).

Next, the configuration of the processing bag fiiC20 will be explained based on FIG. 4 (bl) and FIG. 5.

The processing device QD first reads the buoyancy information (5) at regular intervals (a-1), and each time new buoyancy information WnjP is read, it compares it with the past buoyancy information Wn-r and calculates the difference between the two (a-1). 2) L-Then, the result of Ca-2) is checked to determine whether or not it is an inflection point (a-8). Heat resistant float A9 removes slag from the air! The time T when entering j (c),
For the first time, it is determined that (a-:'l') is an "inflection point," and the position information Ln at that time T1 is read (a-4
) is executed. Every time (a-4) is executed, the counter is incremented (a-5)L, and then it is checked (a-6) whether the count value of the counter incremented in (a-5) is "2". . Since the count value=1 at the time T1, (a-7) is executed after (a-63).

In (a-7), assuming that the position information Ln read in a-41 is the inflection point P1 of tb+ in Fig. 4, the slag surface position rl
Input the position information Ln'x into lLa (return to a-13). At time T2 when the heat-resistant float (lυ enters the molten metal layer 14' from the slag/!! (support)), it matches again at (a-8) is detected, it is incremented again at (a-5), and (a-
A match is detected in 63 and (a-6) is then (a-8)
is executed. In (a-8), assuming that the position information Ln read in (a-4) is the inflection point P2 in Figure 4 tb), the position information Ln is entered into the molten metal surface level htLb, and the inflection point P1 is When detected, slag j-thickness is calculated by (Lb-La) and output for position control of the slag head (2).

In this way, the specific gravity of the slag is ``2~4'' and the specific gravity of the melt surface is 7.2.
(There is a remarkable difference in heat resistance flow) (Since the slag layer thickness A is determined by detection by 1G immersion, higher accuracy can be expected compared to the conventional electric resistance type.

Further, since the heat-resistant float 09 and its shield side are formed in a jΔ configuration as shown in FIG. 6, unnecessary adhesion of slag etc. to the heat-resistant float 09 can be prevented, contributing to improved accuracy.

In Fig. 6, the heat-resistant float is formed of a porous plug (c), and pressurized air (c) [pressure higher than the static pressure] is supplied from the upper end through the extension pipe α flaw. It is released from the description of heat-resistant float (2). When the air is released from the heat-resistant float cL9 in this way, the released air floats along the heat-resistant float cL9, and the hot slag layer moves from the bottom layer of the slag layer to the top layer around the heat-resistant float cL9. of the flow)
It is thought that this occurs, thereby preventing the slag from coagulating on the surface of the heat-resistant float α9. Since adhesion of unnecessary substances to the heat-resistant float α is thus prevented, the surface area of the heat-resistant float αυ does not change and the detection accuracy does not deteriorate.

@7 Cause and FIG. 8 show other embodiments of FIG. 6, respectively.

In Fig. 6, since the entire heat-resistant float α9 is formed of a porous plug (C), air is also released from the bottom surface (To) of the heat-resistant float (To). Forming the sides with porous plugs,
(Heat-resistant flow) (JFJσ) By drilling an air release port (c) that opens on the side surface of the lower part to prevent air from being released from the bottom surface C1.

The pulsation of buoyancy information due to air release can be reduced, and further improvement in detection accuracy can be expected. Note that the gas supplied from the heat-resistant float does not have to be air, but may be argon, nitrogen, or the like.

As explained above, the slag thickness detection device of the present invention is more accurate than the conventional electric resistance type because it can detect the slag thickness from the buoyancy change acting on the immersed heat-resistant float and the immersion position. In addition, since the heat-resistant float releases air supplied from a pressurized air source, it prevents the increase in surface area due to slag adhesion to the heat-resistant float, contributing to further improvement in detection accuracy. This is what we are doing.

[Brief explanation of the drawing]

The AT diagram is a configuration diagram of the vacuum suction type sludge removal system, and Figure 2 and @
Figure 3 is an explanatory diagram of the position control of the suction head, respectively.
Figures 4 to 8 show embodiments of the present invention, Figure 4 is an explanatory diagram of the slag thickness detection device, la) is a configuration diagram, (b) is a characteristic diagram of buoyancy versus immersion depth, and Figure 5 is the main part flowchart in Fig. 4(a), Fig. 6 is a front view of the heat-resistant float, i@7
This figure and FIG. 8 are a partially cutaway front view and a line sectional view showing another embodiment of FIG. 6, respectively. (1)...Ladle, (2)...Suction head, u
d...slag surface, (to)...molten metal layer, u4...melting tank, u9...heat resistant float, Uυ...lifting device,
α force: load cell, (e): rotary encoder, riD: processing device, (a): slag HA,
(c) Porous plug, ■ Pressurized air, (b) Air release hole, P, P, Inflection point, A
... Slag 11 Thick Agent Yoshihiro Morimoto Figure 2 Figure 3 Figure S Figure β

Claims (1)

[Claims] 1. A heat-resistant float is gradually immersed from above the slag surface to be treated by the vacuum suction type slag removal system toward the molten metal layer below the slag layer to reduce the change in buoyancy acting on the heat-resistant float. The inflection point is detected, and the slag layer thickness is determined based on the position information of the heat-resistant float at the time of detecting the inflection point, and gas is released from the heat-resistant float to remove unnecessary materials from the heat-resistant float. A slag thickness detection device in a vacuum suction type slag removal system designed to prevent adhesion. 2. Form a heat-resistant float with a porous plug,
The slag thickness detection device in a vacuum suction type slag removal system according to claim 1, characterized in that the gas is supplied from the upper end of the porous plug. 3. Claim 1, characterized in that the lower side surface of the heat-resistant float is formed of a porous plug, and gas is supplied to the porous plug from the upper end through an internal passage of the heat-resistant float. A slag thickness detection device in the vacuum suction type slag removal system described above. 4. A gas discharge hole is formed in a part of the lower part of the heat-resistant float, and gas is supplied to the discharge hole from the upper end through an internal passage of the heat-resistant float. A slag thickness detection device in the vacuum suction type slag removal system according to item 1.