CN202779637U - Device for quickly and precisely detecting and controlling baking temperature of steel ladle - Google Patents

Abstract

The utility model relates to the field of temperature measurement of high-temperature kilns in the steel industry and the non-ferrous metallurgical industry, and in particular relates to a device for quickly and precisely controlling baking temperature of a steel ladle. The device is characterized by comprising a PLC (Programmable Logic Controller), an infrared temperature measuring instrument, a hot wire anemometer and a solenoid valve, wherein the infrared temperature measuring instrument, the hot wire anemometer and the solenoid valve are respectively connected with the PLC; and the solenoid valve is arranged on a fuel pipeline. Compared with the prior art, the device provided by the utility model has the beneficial effects of being compact, simple and reasonable in structure and easy to operate, greatly improving the temperature measuring environment of the steel ladle in braking, prolonging the service life of a temperature measuring instrument, improving the accuracy in temperature measurement, and providing basic data for precise control on thermal regulation on baking of the steel ladle.

Description

A kind of device that fast, accurately detects and control baking temperature of steel ladle

Technical field

The utility model relates to the High-temp. kiln temperature survey field in iron and steel, the nonferrous metallurgy industry, relates in particular to a kind of device that fast, accurately detects and control baking temperature of steel ladle.

Background technology

Ladle is the container of containing the storage molten steel, is again the part of refining equipment, and it is undertaking the multitasks such as access, refining and transportation molten steel.The standard of estimating ladle except examine its design parameter whether satisfy institute on stream before and after the requirement of operation, baking temperature of steel ladle is the key factor that guarantees the ladle quality and affect production cost and the steel quality of steelshop.

Studies show that and improve the front ladle inner wall temperature of tapping, can reduce the tapping process molten steel temperature drop.Satisfying under the reasonable cast temperature prerequisite of continuous casting, suitably reducing the liquid steel temperature of coming out of the stove, can improve life of converter, increasing output of steel, therefore fast, accurately detecting baking temperature of steel ladle is to realize the accurately necessary condition of control of steelmaking and continuous casting.

Mainly be to utilize the steel ladle cover top to insert atmosphere temperature in the thermocouple measurement bag at present, be aided with again experienced technical staff touches the steel seat with hand method estimation ladle inner wall temperature.But because the thermocouple length restriction, it can only record near the furnace gas temperature the clad; The little come-up of hot gas density is so that furnace gas temperature skewness in the ladle; Frequently open again simultaneously clad and suck cold air, so that existing measuring method can accurately not record the ladle inner wall temperature.

Summary of the invention

The purpose of this utility model provides a kind of device that fast, accurately detects and control baking temperature of steel ladle, improve the thermometric environment of ladle baking facilities, prolong the service life of temperature measuring device, improved simultaneously the accuracy of thermometric, the data on basis are provided for the accurate control of ladle baking thermal regulation.

For achieving the above object, the utility model is achieved through the following technical solutions:

A kind of device of fast, accurately controlling baking temperature of steel ladle comprises PLC, infrared radiation thermometer, hot-wire anemometer and magnetic valve, and infrared measurement of temperature instrument, hot-wire anemometer and magnetic valve link to each other with PLC respectively, and described magnetic valve is provided with on the fuel channel.

Compared with former technology, the beneficial effects of the utility model are: compact conformation, advantages of simple, easy operating, greatly improved the thermometric environment of ladle baking, prolonged the service life of temperature measuring device, improved simultaneously the accuracy of thermometric, the data on basis are provided for the accurate control of the thermal regulation of ladle baking.

Description of drawings

Fig. 1 is the utility model device example structure schematic diagram.

Among the figure: 1-ladle 2-point for measuring temperature 3-burner 4 – fuel channel 5-magnetic valve 6-infrared radiation thermometer 7-hot-wire anemometer 8-PLC

The specific embodiment

Below in conjunction with accompanying drawing the specific embodiment of the present utility model is described further:

See Fig. 1, be the utility model a kind of fast, accurately control the device example structure schematic diagram of baking temperature of steel ladle, comprise PLC8, infrared radiation thermometer 6, hot-wire anemometer 7 and magnetic valve 8, infrared radiation thermometer 6, hot-wire anemometer 7 and magnetic valve 5 link to each other with PLC8 respectively, and magnetic valve 5 is provided with on the fuel channel 4.The PLC8 model is Siemens S7-200.

The utility model is to use the temperature value that infrared radiation thermometer 6 is measured the many measurement points 2 of ladle 1 outer surface, calculates ladle inner surface each point temperature value by the heat transfer model of implanting PLC, and the step of its realization is as follows:

1) at the outer surface of ladle 1, along uniform several points for measuring temperature 2 on circumference and the vertical direction, infrared radiation thermometer 6 is measured each point for measuring temperature 2 successively, gets the each point measured temperature;

2) adopt programmable controller PLC that the each point measured temperature is weighted algorithm, get rid of measure error, calculate reasonably each measurement point ladle hull-skin temperature t _w

3) the air themperature t that utilizes hot-wire anemometer 7 to measure in the ladle periphery 50-100mm distance (original text " certain distance " is imprecise) _o, and import convection current radiation heat transfer coefficient computing module, calculate convection current radiation heat transfer coefficient h;

$h=9.2\×{(t_w-t_o)}^{1/4}+\frac{20.4\×\mathrm{\ϵ}\×[{\left(\frac{t_w+273}{100}\right)}^4-{\left(\frac{t_o+273}{100}\right)}^4]}{t_w-t_o}---\left(1\right)$

In the formula (1): t _w-ladle hull-skin temperature, ℃; t _o-air themperature, ℃; ε-ladle outer surface blackness;

4) utilize ladle 1 hull-skin temperature t _wTransient temperature t with convection current radiation heat transfer coefficient h calculating ladle inner surface different depth place _i

$t_i=t_w+q\×(\mathrm{\Σ}\frac{{\mathrm{\δ}}_i}{{\mathrm{\λ}}_i}+h)---\left(2\right)$

In the formula (2): q-heat flow density, w/m ²The scene records; δ _iThe thickness of-Di i layer material, m; λ _iThe thermal conductivity factor of-Di i layer material, w/ (mk);

5) require by PID temperature feedback adjuster adjustment baking air-fuel ratio according to ladle baking, utilize PLC that magnetic valve 5 apertures that are installed on the fuel channel 4 are controlled, the flow through fuel feed of burner 3 of adjustment, realize the automatic baking of ladle, after the transient temperature in the ladle reaches desired value, automatically change the insulation program over to.

Claims (1)

1. device of fast, accurately controlling baking temperature of steel ladle, it is characterized in that, comprise PLC, infrared measurement of temperature instrument, hot-wire anemometer and magnetic valve, infrared measurement of temperature instrument, hot-wire anemometer and magnetic valve link to each other with PLC respectively, and described magnetic valve is provided with on the fuel channel.

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