SU974073A1 - Metallurgical furnace regenerator packing - Google Patents

Description

(54) METALLURGICAL REGENERATOR ASSEMBLY

one

The invention relates to a device; for high temperature air preheating and can be used in the metallurgical industry and other industries.

The known nozzle of the regenerators of the metallurgical furnace, mainly for heating the air, is made of refractory bricks and contains vertical channels with a constant area of the flow area

Heat recovery by nozzle is better, the narrower the channels and the longer the path of the gases. However, the depth of the chambers is determined by the groundwater level, ease of operation, and usually does not exceed 7–8 m below the floor level of the workshop. The cross section of the cells in the nozzles is determined by the amount and properties of the dust contained in the dm gases and the tendency of the nozzle refractories to overgrow. As a result of dust drift in the cells of the regenerator nozzle, its aerodynamic operation is disrupted and the heat exchange conditions deteriorate. To eliminate this drawback, the nozzles of the regenerators are performed with an increased cell cross-section, which leads to a decrease in the temperature of air preheating or to additional heating.

costs of increasing the volume of the nozzle.

Closest to the invention to the technical essence is the nozzle of the regenerator, lined with brick in the .1 Siemens system. The advantage of this nozzle over

(the other is the ability to transfer gas from one channel to

ten

the other in case of clogging of one of them. In addition, the heat transfer surface of such a nozzle is somewhat

more because the horizontal surfaces of the G27 brick are washed with gases,

15

This nozzle of a regenerator of metallurgical furnaces has a number of disadvantages. The cross section of the heat exchange channels is usually chosen by taking into account their drift by the melting or technological 20: dust, which is contained in the flue gases. However, it is known from operating experience of regenerators that the channels in the upper

25 parts of the nozzle constituting 15-25% of the total height. In the rest of the nozzle, it is not rational to leave the adopted section of the channel, since in this case the opportunity

30; increase the heat exchange surface. In addition, this design of the nozzle does not allow for changes in the volumes of flue gases during cooling and air during heating, which leads to a decrease in the speed of their movement, and, consequently, helps to reduce the intensity of heat transfer. The purpose of the invention is to study the heat exchange and increase the temperature of air preheating. This goal is achieved by the fact that the regenerator head of the metallurgical furnace is lined with refractory. brick according to the Siemens system, is made with a uniform reduction of its flow area in the direction of the flue gas movement / pr this ratio of the flow areas of the upper and lower rows is 1.2-2.4. The limits of the ratio are due to possible changes in temperature and volume flue gas when cooled in the nozzle of the regenerator. The upper limit corresponds to the ratio of specific volumes of flue gases at the maximum temperature difference in the regenerator nozzle. It is typical for open-hearth furnaces and heating wells and the composition is EOS-IOO C at the smoke inlet temperature to the nozzle 1400-1 BOOS. The minimum possible temperature difference of dBm gases, the characteristic, hot example, for cold chambers of double-turn regenerators, is 400-600 ° C and determines the lower limit of the ratio of the areas of flow areas. The proposed design of the nozzle of the regenerators of metallurgical furnaces in comparison with the prototype has the following advantages. The rate of movement of fumes and air across the entire height of the nozzle is kept constant, the heat exchange surface is increased by reducing the flow cross section by adding longitudinal and transverse rows of refractory bricks, heat accumulation of the nozzle is increased by increasing the mass of refractories, the displacement of refractory bricks into the next A row of nozzles contributes to the turbulence of flue gas and air flows. The aerodynamic resistance of the nozzle remains practically unchanged. All this allowed HeT to improve the conditions of the heat exchanger d nozzle, and, ultimately, increase the temperature of the preheating air. The drawing shows the nozzle of the vertical regenerator of the metallurgical furnace with decreasing bore area along the DBM gases. The nozzle contains longitudinal 1 and transverse 2 rows, lined with refractory bricks and forming the vertical heat transfer channels 3, and the number of rows increases from top to bottom, reducing the area of the nozzle bore, to ensure the strength of the laying of refractory bricks to 1.62 , 0 times the maximum cross section of the channels, which allows the use of bricks of the same size for the entire nozzle. The masonry can be made with a uniform narrowing of the flow area or stepped, after 5-10 rows, depending on the size of the refractory bricks available. The ratio of the cross sectional areas in the upper and lower rows is determined depending on the temperature of the flue gases. The flue gases, moving through the channels 3 of the regenerator nozzles of the proposed design, are cooled, their volume decreases, and since the flow cross section is narrowed, the speed of movement remains constant. The heated air, moving in the opposite direction after the valves are turned, expands and its velocity also remains constant over the entire height of the nozzle. Consider an example of a specific implementation of the nozzle of the regenerator of the proposed design. Let the flue gas temperature at the inlet and outlet of the nozzle be 1600 and -800 ° C, respectively. The ratio of the surface areas of the upper and lower nozzles of the nozzle, equal to the ratio of the specific volumes of gas at given temperatures, is 1.746. By melting dust channels, the area of their flow area at the inlet to the nozzle is assumed to be 300 mm ZOOh, and the bottom row is 230x230 mm. The heat exchange surface of this nozzle is increased by 250-300 m compared to the nozzle having channels of 300 mm in size over the entire height, and the air heating temperature is increased by 120-150 seconds. For this case, rational use of standard bricks 460x150x75 mm or 520x150x75 mm is rational, more than the maximum section of channels more than 1.5 times. The nozzle of the regenerator of the proposed design allows, without significant expenses, to increase the temperature of air preheating, prevent overgrowth of the channels with melting dust and reduce consumption of equivalent fuel by 3-5 kg per ton of product, the invention's formula The nozzle of the regenerator of a metallurgical furnace made of bricks placed on the Siemens system, so that, in order to improve the heat of exchange and increase the temperature in heating the air, it is {, complete with a herbal reduction in the area of its flow area in ii, 1dvits; tim flue gases, the ratio ploschat bushing, the cross sections of the upper and lower rows is 1.2-2.4.

Sources of information taken into account in the examination

1. Lemleh I.M., Gordin V.D. High-temperature heating of the air in black metallurgy. M ,, Metallurg 5

izdat, 1963, p. 74-76.

2. Bass with I.P., Chernogolov A.I. Regenerators open-hearth furnaces. Sverdlovsk, Metallurgiedat- 1961, 10 p. 83-86.

Claims (1)

Claim The nozzle of the regenerator of a metallurgical furnace made of brick 5 placed according to the Siemens system, characterized in that, in order to improve heat transfer and increase the temperature of the air heating, it is made with a uniform decrease in the area of its passage in the direction of the smoke gases, while the ratio of the areas of the passage, sections of the upper and lower rows is 1.2-2.4.