SU1420325A1 - Method of heating combustion furnace - Google Patents

Abstract

The invention is intended for heating fiery furnaces operating on an unheated or low-temperature blast using fuel combustion, which gives a non-glare torch with a torch illuminated by a carburetor. The aim of the invention is to increase the productivity and thermal efficiency of furnaces. A backlight carburetor is supplied separately from the fuel to the high temperature zone of the flame at a distance from the beginning of the flame, determined by the equation, 1 H, 1H. f-ly, 1 tab.

Description

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The invention relates to industrial heat and power engineering and can be used for heating fiery furnaces.

The purpose of the invention is to increase the productivity and thermal efficiency of furnaces.

In the examples, calculated using the mathematical model of heat transfer, the heat regimes are the same as those known for heat load (60 MW power), for the carburizer consumption (fuel oil consumption 1100 kg / h Dpina torch (from calculations and visual observation)) 1 ( 7.5 M,

Example 1 (known).

Together with a gas-oil burner, a fiery furnace is supplied to the reflector furnace together with natural gas (4850 m / h) and fuel oil (1100 kg / h) with a temperature to blow tg 0 ° C. The following furnace performance indicators were obtained: the specific melting of the charge was 3.91 t / m; temperature at the beginning of the furnace is 1445 ° C,

at the end of 1280 ° C; thermal efficiency of the furnace 37

Example 2 (proposed)

The costs of gas and fuel oil are the same, but the carburizer is supplied separately (for example, through a nozzle installed in the furnace vault) to the torch zone, away from its beginning, at tg 0 ° С at a distance of 5.25 m (0.71 0.7-7.5 - 5.25 m) o

Indicators: the melting of the charge 4,20 t / (.); the temperature at the beginning of the furnace is 1470 ° С, at the end of 1250 ° С; thermal efficiency of 37.8%.

Example 3 (temperature blow t, iO ° C).

The costs of gas and fuel oil are the same, the temperature is blowing tg -10 ° C, the carburizer is supplied separately to the flame zone, which is separated from its start at t. -10 ° C, with this 1 being 5.3 Mo

Indicators: specific melting of 3.90 t / (m day); the temperature at the beginning of the furnace is 1425 ° C, at the end of 1295 ° C; thermal K1Shch 35.2%.

Example 4 (known at tj 500 C).

The costs of gas and fuel oil are the same. The carburetor is supplied together with the main fuel through gas fuel oil burners. Temperature blow 500 ° C. Indicators specific melt 5.25 t / (); temperature in the beginning

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le furnace 1590 ° C, at the end of 1300 C; thermal K1Shch 39,6%.

Example 5 (proposed at tg 500 C).

The costs of gas and fuel oil are the same. The carburizer is fed separately to the high temperature zone of the torch, which is separated from its onset at t g 500 ° C at a distance of 1 2.86 m.

Indicators: specific melt 5.55 t / (m “day); temperature at the beginning of the furnace, at the end of 1280 ° С; thermal efficiency 4 P.

Example 6 (temperature blow tg 7,500 ° C).

The costs of gas and fuel oil are the same. The carburizer is fed separately to the torch zone, which is removed from its beginning at tj 550 ° C at a distance of 1 2.6 meters.

Indicators: specific melt 5.5 t / (); the temperature at the beginning of the furnace is 1610 ° C, at the end of 1285 ° C, the thermal efficiency is 40.9%.

The performance of the furnace in examples 1-6 are shown in table

In comparison with the known proposed CMbD f, the heating method allows, due to the increase in the luminosity effect yBBJiH iHTb, the furnace productivity by an average of 5-6%.

Claims (2)

Invention Formula 1o. A method of heating fiery furnaces operating on an unheated or cold-temperature blast, including the supply of fuel giving a non-luminous torch, and a carburizer for illuminating the torch, characterized in that, in order to increase the productivity and thermal efficiency of the furnaces, the carburizer is fed separately to the high-temperature zone torch:  2. A method according to claim 1, characterized in that the carburizer is supplied to the facup zone at a distance of 1 from the start of the plume, determined by the rH equation / 1100 - tB 1 0.71f 1100) where tj is the temperature not exceeding the temperature for low temperature blowing 500 ° C; 1f - the length of the torch, m „ 3.91 % 37.1 4.20 3.90 5.25 5.55 5.50