SU734289A1 - Device for measuring temperature of hot blasting - Google Patents

Description

The invention relates to metallurgy and can be used to measure the temperature of a hot blast furnace, as well as the temperature of the dome of the air heater by the contact method.

A protective device for installing a thermocouple on a dome of an air heater of a blast furnace is known, which contains a core pipe with a flange, a thermocouple in a cover, a refractory stopper with an overflow hole located in the lining of the dome

eleven.

The disadvantage of this device is the low resistance of the thermocouple sheath due to the effect of high-intensity intense gas flows.

A device for monitoring the temperature of a hot blast blowing, containing a thermoelectric thermometer, protective fittings for installing a thermometer, on the duct of a hot blow, which allows the out of date thermometer to change during the operation of a blast furnace, is known.

The main disadvantage of the known device is the low reliability of the thermoelectric protective cover. A thermometer that is exposed to high temperatures reduces its resistance. The design resistance of the working end of the thermometer is 3 months when exposed for a short period during this period (not more than

10 15 min) elevated temperature in the air duct up to, with total. with a duration of 1.5 hours. At a temperature of 1250 ° C, the resistance of the thermometers being operated was 1-2 months.

The aim of the invention is to increase the durability of a device for changing the temperature of a hot blast furnace.

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The goal is achieved due to the fact that in a device for measuring the temperature of a hot blast furnace, including protective armature, a thermocouple placed in a sheath, a sheath

25 is made in the form of an annular heat pipe with a socket at the working end and is equipped with a pressure sensor built into its wall, connected to a light and sound alarm ..

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Such a constructive solution allows the thermocouple, besides the hot spa, to be protected from the direct impact of the highly heated flows of the current, covering it in the socket of the protective cover made in the form of an annular heat pipe, and timely receiving information about the protective cover from the pressure sensor, thereby increasing thermometer resistance. ,

FIG. J depicts the pitch, my device, general view; in fig. 2 is a sectional view of a portion of the protective cover, made of a coaxial heat pipe with a bell mouth and a protective ceramic tip; in fig. 3 is a sectional view of a portion of a protective case with a pressure sensor.

A device for measuring the temperature of a hot blow contains a thermocouple, the body 1 of which is made, for example, of steel X25T and is connected with a conventional ceramic tip 2, for example, made of sintered alumina with additives, the outer surface of which is covered with layer 0 , 5-1 mm of special coating 3. Thermocouple electrodes are isolated from each other by a two-channel ceramic tube 4, for example, from alumina. The thermocouple is placed in a protective case 5, made in the form of a coaxial heat pipe with a socket 6, in which a protective tip 2 is placed.

At the other end of the protective cover 5, a water cooler 8 and a pressure sensor 9, for example a bellows, are placed. The housing 10, the pressure sensor 9 has a contact output made, for example, on the reed switch 11, the closing contact of which is used in the sound and light signaling circuit protective cover

A thermocouple in a protective sheath 5 is placed in a protective armature 12, designed to be sealed and replaced, on the air duct during operation of the blast furnace.

The heat imparted to the protective cover 5 is removed by a stream of hot blowing by means of a coaxial heat pipe in the water cooler 8 and is carried away by the cooling water circulating in it. Heat transfer using heat pipes is known.

The internal cavity of the coaxial heat pipe is in working condition under vacuum, as a result of which the bellows sensor 9 is compressed. During operation, when the coaxial heat pipe runs out of its working time and Tens conductivity deteriorates, it burns out, and the internal cavity of the heat pipe connects to the working space of the pipeline blowing at a pressure of 5 atm, and the sensor 9 detects the heat pipe burnout. Alarms will work and a broken case will be replaced in a timely manner, which will keep the thermocouple operational.

The life of the heat pipes is about 10 thousand, which will ensure reliable operation of the device for measuring the temperature of mountains Q which blows without changing the protective cover for 1 year and significantly increases the durability of the thermometer. The proposed design of a device for measuring the temperature of a hot blow is operable up to 1800 ° C.

Claims (1)

1. USSR author's certificate 298652, cl. From 21 to 7/24, 1971. Suda J.