SU438694A1 - Apparatus for detecting burnout of cooling elements of a blast furnace - Google Patents

Description

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The invention relates to ferrous metallurgy, in particular, to devices for detecting burnout of cooling elements of a blast furnace, for example, air tuyeres.

A device for detecting the burnout of cooling elements of a blast furnace, made in the form of a vessel equipped with an overflow partition and a hydraulic lock, divides the vessel into a gas chamber with a gas pressure sensor and a drain chamber with a window that connects it with the atmosphere.

The drawbacks of such a device are low sensitivity and unreliable operation due to the impossibility of separating fine gas dispersed and dissolved gases from the cooling water, especially at high pressure (5-f8 MPa) in the blast furnace cooling system, in which the degree of injection of the jet water prevails over the degree of evolution of gases.

The aim of the invention is to eliminate these drawbacks, i.e., to increase the sensitivity and reliability of burnout fixation at high water pressures.

This goal is achieved by the fact that the gas chamber of the proposed device is equipped with an acoustic wave generator and an atmospheric valve which is built into its cavity under the water inlet nozzle.

The proposed device has a high sensitivity and reliability in operation compared to the known due to the almost complete separation of fine gas inclusions and dissolved gases from the cooling water under the action of acoustic vibrations. With the help of acoustic oscillations, gas bubbles can be isolated from a liquid, ranging in size from one thousandth of a millimeter to several millimeters in diameter. In addition, the proposed device provides a quick and convenient adjustment to the operating mode when the pressure and cooling water flow vary by manually or automatically changing the radiation intensity of the source of acoustic oscillations. The ability to adjust the degree of communication of the gas chamber with the atmosphere provides a choice of the operating mode of the device, excluding the issuance of spurious signals due to the release of dissolved air from the cooling water. Connecting the vessel body to the acoustic oscillator through acoustic separation and transfer of the oscillations into the cooling water using a matching element allows one to obtain the maximum effect of gas evolution from the water with minimal energy consumption. The proposed device is suitable for a blast furnace of any size and especially for powerful blast furnaces.

furnaces with a useful volume of 2700 m and 5000 m,

The water pressure in the cooling system of which reaches 8 atm and more, at which the known device is inoperable.

The drawing shows a General view of the described device in vertical section.

The device is made in the form of a vessel containing a body 1 made of steel, for example, with an inlet Nozzle 2 for supplying water from the cooling element. The upper part of the internal cavity of the vessel is a gas chamber A, on which a gas pressure sensor 3 and a valve 4 are installed, controlling the degree of its communication with the atmosphere. In the lower part of the vessel body 1, there is a V-shaped drain connection 5 for creating a water seal and a valve b for adjusting the water level in the vessel.

At the bottom of the housing 1, a rigid membrane of acoustic isolation 7 is fixed, clamped between flanges 8, by means of which a concentrator 9 is fixed, the input of which is connected to an acoustic oscillation generator 10, for example, magnetostrictive, and the output with a matching element 11.

The device works as follows.

The waste water after the cooling element through the inlet pipe 2 enters the internal cavity of the vessel body 1 and through the drain pipe 5 and valve 6, which serves to regulate the level of water in the vessel, goes into the drain header. In the cavity of a vessel, the flow of water is subjected to oppositely directed acoustic oscillations emitted by the acoustic oscillator 10 and transmitted to the cavity of the vessel by means of a concentrator 9, an acoustic junction 7 and a matching element AND transmitting acoustic oscillations directly into the stream of water passing through the vessel. When a cooling element is impaired (burned out) of the cooling element, part of the gases from the working space of the blast furnace is captured and carried away by cooling water. In this case, in the cooling water, the gases are both in the free state in the form of separate bubbles of different diameters, and in the form of fine gas-water compounds. Spreading in the water, acoustic vibrations meet moving gas bubbles in their path and exert pressure on them. As the gas bubbles approach the matching element 11, the pressure on them increases, and their speed gradually fades out to a complete stop. Then the bubbles are combined with each other, dramatically increasing in size and float to the surface of the water, accumulating in the gas chamber A of the vessel. When reaching the gas pressure in the gas chamber A 5-

-f-20 mm waters. Art. The contacts of the gas pressure sensor 3 close with the output of an electrical signal to the control circuit of the warning signal for the burnout of cooling elements. In the absence of cooling burnout

the element, air dissolved in water, is also released from it under the action of acoustic oscillations and accumulates in gas chamber A, which can lead to a false burn signal from the device. In order to prevent the device from issuing a false signal, the gas chamber A of the vessel is provided with a valve 4, by means of which the air released from the water is vented to the atmosphere. The degree of communication of the gas chamber A with the atmosphere is established when the device is set to operating mode.

Subject invention

A device for detecting the burnout of cooling elements of blast furnaces, comprising a gas chamber with a water seal and a pressure sensor, supplying and discharging water nozzles, characterized in that

in order to increase the sensitivity of the device and the reliability of burnout fixation at high pressures of water, the gas chamber is equipped with an acoustic oscillation generator built into its cavity under the inlet nozzle and

atmospheric valve.

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