SU1404773A1 - Heating dome for annealing roll stack - Google Patents

Abstract

The invention relates to the field of metallurgy, in particular, to devices for the heat treatment of sheet metal, and can be used in the heat sections of cold rolling shops. The purpose of the invention is to reduce the fuel consumption and increase the resistance of the muffle for. by increasing the uniformity of heating, this is achieved with additional haf pe

Description

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of the zones of the sounder coming from the recovery ektortnogo device in ko.) gp8ytore- and due to the combustion of fuel with the same calorimetric temperature (in each burner) as a result of which it is necessary to measure the temperature of the heat of his meter, The proposed design of the j-isfre-vate.podn, about the cap ocyinecTBj HH) Thermally, using a stand on the bench, forms a stack of rolls 5 and then fills its muffle ™ and installs a heating one. cap About The resulting combustion products from burning gaseous tohshiva using burners 3 are fed from the top down through the annular gap between the refractory cylinder 2 and the muffle and

 are removed through the openings 6 to the smoke exhaust pipes 7b. For two, the combustion products transfer heat to the muffle through the gap. And when moving through the smoke exhaust pipes, the heat exchanger fj5BHo 3KeKTOpHb: M devices 8, simultaneously with the start-up of the heating panel, through the pipeline 9 cold air is supplied to the lower part of the recuperative ejector device 8. Moving from the bottom up to the height of the smoke exhaust pipes 75, the air is heated and at the outlet of the chimney nozzles 10 enters the collector 5 °. The air entering the collector 5 is heated from the outer surface of the housing 1 to The olpak in the area of the windows to the pipelines 4 is fed to the burners 3, 3 of the table, 2 Il.

The invention relates to metal gaur5, in particular, to devices for the machining of sheet metal; and can be used in thermoelectric treatment by rolling block

The goal of the zyzobratech is to reduce; the rate of the condition of the conventional toggle and the increase in the cost of the condition is reduced to the uniformity of the heating | Q

Na fig ,, represented by the heater. H5) kol pak g obdal vid5 in fig „2 - section aa to fig, i“

The proposed design of the sgo cap heater consists of a dilind- 5 of the case I, open on the bottom of the lined fire-resistant mat. 2o. In the second part of the cap, 12 double-sided burners 3 are installed, Indy in the burner 3 with -ig power of the exhaust pipes 4 is supplied from the ring of collector 5, for example, P - 6 different sech sh., Rigidly connected to body 1, the registry office. In the upper part of the heating, 25%. 1 symmetrically to the upper wavelength1 two boreholes connected with the smoke outflow - HbjKH pipes 7jB of which are located the river ggratratko-ejector devices 8 “COLD1F1Y air 3 recuperative B-ez jg mining device 8 enters a pipeline-bp a pipeline, a pipeline, bp a pipeline, bpc of each recuperator v-ez-worn yc f

The device 8 is directed to the collector 5 along two symmetrically located branch pipe S1: pipe nozzles 10, Collector 5 can be made in the form of an annular closed pipe or In the form of separate annular sections according to the number of retraction of the nozzles 10 Hot air from the tank the section is fed to a multiple of the total number of burners. In the refractory masonry 2 are made according to the number of burners 3 windows P,

The difference between the proposed heater and the uoro cap from the well-known roMj is that the refractory masonry 2 in the contact zone of the collector 5 is hot air with the body of the heating cap is made rto to the number iHi pejiOK 3 windows S: j the height of the IKOTO is 5 paiiHa the diameter of the collector 5 is heated air-ta, dd ing windows, prile gavoshdkh; l peKynepaTHBHt -sHeKTOpHbiM device-uvam 3 is equal to H3i height, and the length of the running button is: OjS dyne; -; the first person

Leave.:, G of the foot of the rolls with the use of the scoop, of the one-stangered construction of the heating; -cap hood is carried out following

On the wall form; gk; t table rolls, cover, its muffle and Z stanazlivayut heating krhgpaks Formed products and burns as a result of ozggakn

gaseous fuels with burners 3 are fed from the top down through the annular gap. between the firestone 2 and the muffle and further removed through the openings 6 smoke exhaust pipes 7. When moving through the annular gap, the combustion products transfer heat to the muffle, and when moving through the smoke exhaust pipes recuperative ejector devices of the thrusting window (according to number 8. Simultaneously with the start-up of the heater-burners), provided that the length of whom is the cap through the pipeline 9 serves cold air in the lower part of the recuperative-ejector device 8.

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The windows adjacent to the recuperative ejector devices are equal to their height, and the length of each successive window. Moving upward from the height of the smoke emitter 15 does not exceed 0.6–0.7 the length of the outlet pipes 7, the air heats up the previous one.

and through the outlet nozzles 10 enters the overall dimensions of the windows, allowing it to the collector 5; The conditional fuel consumption, when used in the annealing process, of the proposed heating flow to the recuperative-ejector pack, is achieved as a result of additional devices, and Table 2 shows the heating of the air coming from the recuperative -an injection device in the collector. Additional heating of the air in the collector is provided in 30 as a result of heat exchange of air from the surface of the body in places where windows are made in the refractory masonry. In the window area, the body temperature is significantly higher than the collector temperature of 03-35; the casing receives thermal loss of the furnace into the surrounding heat of the directly radiating space.

by the combustion products. From the data presented in Table 1, the temperature of the air going to it follows that the optimal length of the windows, burning, leads to a reduction in the flow rates of the surrounding collector air with a minimum temperature difference along its depth, found experimentally.

Table 1 shows data on the definition of the optimal length of windows, given by definition the length of the windows that follow them.

I

The height of the windows is taken to be equal to the height of the collector, since with the height of the windows smaller than the height of the collector, effective air heating is not provided. When the height of the windows is greater than the standard fuel height. Thus, by increasing the air temperature, a certain amount of heat is introduced into the furnace, the amount of which is reduced by the amount

fuel fed to the furnace on the mountain- 45 If the length of the window is less than its height.

other things being equal, in particular, at a certain heat output. The resistance of the muffle when used as a result of heat losses to the first burners, adjacent to the regenerative-ejector devices, the air comes from a lower temperature of the proposed heating design- 50 at the outlet of the heat exchanger, the housing cap is increased due to the condition of burning fuel and C of the same calorimetric temperature (in each burner), as a result of which the heating muffle uniformity increases, gg is small.

its perimeter. Same temperature. When increasing the ratio of the length of the torches of the burners is a consequence of Lodachi in the burner of heated air for burning fuel almost

Supplementary heating of air, despite not. that in this case, too, the temperature difference in the air

windows to its height of more than 1.0 significantly increase the temperature of the air entering the first burners, when

The temperature is the same, i.e. by reducing the temperature difference between the air entering, for example, the first burner and the next burner, to a minimum.

Reducing the temperature difference of air heating in the collector is provided by the charge in the fire.

The overall dimensions of the windows, which allow to ensure maximum succession to the regenerative-ejector devices, and Table 2 shows the collector significantly increase the thermal loss of the furnace into the surrounding space.

After heating the air in the reservoir with a minimum temperature difference in its depth, it was found experimentally.

Table 1 shows the data for determining the optimal length of the windows, with the overall dimensions of the windows allowing for maximum succession to the recuperative-ejector devices, and Table 2 shows the collector significantly increase the heat loss of the furnace to the surrounding space. .

data, by definition, the length of the subsequent windows.

I

The height of the windows is taken to be equal to the height of the collector, since with the height of the windows smaller than the height of the collector, effective air heating is not provided. With the height of the windows more high-rise devices, should be equal to the height of the collector. In this case, the temperature difference in the air entering the burners is minimal -.

then, as a result of heat losses to the first burners, adjacent to the recuperative ejector devices, the air enters at a lower temperature at the outlet of the recuperator. Consequently, the condition is not satisfied is small.

Supplementary heating of air, despite not. that in this case, too, the temperature difference in the air

 By increasing the length ratio

windows to its height of more than 1.0 significantly increase the temperature of the air entering the first burners, when

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damping to recuperative ejector devices. At the same time, due to the increase in air temperature, heat losses increase and the temperature difference of the eo-escalation is 1.6-2.0 5az.

When the optimal length of windows adjacent to recuperative ejector devices is selected, the minimum temperature difference of the order of C s along the air going to the burners is achieved if the ratio of the length of the next window to the length of the previous one is 0.6-0.7. - more than 0.6-0.7 temperature difference increases by 3-4 times due to an increase in air preheating in subsequent windows. At a ratio of less than 0.6-0.7, the temperature difference is also 3-5 times higher, however, case, moreover, the air temperature decreases along the distance from p kuperativno- ejector "devices. Consequently, based on the condition of the optimal value of equivalent fuel saving and uniform heating of the muffle around the perimeter, the ratio of 0.6-0.7 is the most rational,

Predlagaya fyyu design of the heating cap will be tested in industrial conditions. They take the well-known cone of the heating cap and the outer perimeter of the housing is rigidly installed a rectangular ring collector 200 m high, with separate valves for four sectors, so that everyone has a supply air from the recuperative –– recuperative –––––––––––––––––––––––- devices, the Gfc air from each sector of the cector at which three torches are supplied. In the refractory masonry of the heating cap, 12 windows are made according to the number of burners. Moreover, for four burners located on both sides, two recuperative ejector devices (smoke pipes), windows are made with a size of 200-200 MMJ, for subsequent ones, the windows have a length of 0.65

previous. The height of the window for each burner is 200 mm. In the process of annealing the coil foot using the proposed designs of the heating cap, the corresponding thermotechnical measurements are made as shown in Table 3.

Analysis of the obtained data shows that the use of the proposed heating cap allows reducing the consumption of equivalent fuel from 40-45 kg of fuel equivalent per ton to 37-42 kg of fuel equivalent per ton, i.e. an average of 5-7%, while increasing the resistance of the muffle due to increased heating uniformity. The temperature difference between the torches of the burners is reduced from 80 to

Thus, the use of the proposed heating cap in comparison with the known allows to reduce the consumption of equivalent fuel and to increase the resistance of the muffle due to an increase in the uniformity of its heating.

Claims (1)

Invention Formula A heating cap dp of coils of foot containing KOplnyc open bottom, lined with refractory bricks, burners, recuperative ejector devices, smoke pipes and heated air collector, which, in order to reduce the consumption of equivalent fuel and increase the resistance of the muffle due to more smoke, to reduce the consumption of conditional fuel and increase the durability of the muffle due to more smoke, heating it, in a refractory masonry in the zone of contact between the hot air collector and the body of the heating cap. 1s of the burners, the height of which is equal to the diameter of the heated air collector pipe, the length of the windows adjacent to the regenerative devices is equal to their height, the length of each next window is 0.6–0.7 of the previous one. Air temperature without additional heating of the window in refractory masonry. Table I Table 2 T "vlits" E