SU1517884A1 - Method of heating up oven - Google Patents

Abstract

The invention relates to the baking industry, namely to baking ovens. The purpose of the invention is to reduce the heating time, fuel consumption, reduction of thermal stresses of steam pipes. Initially, when the heating water heating pipes 2 are heated to the operating temperature, both the furnace surfaces located in the heat exchange duct 3 and the heat transfer surfaces of the steam heating pipes located in the baking chamber 4 are heated. In this case, the temperature of the gas mixture is controlled by the recirculation fan 8 and the gates 5, 6, and 7 due to the ratio of the costs of the flue and exhaust gases in the tracking chamber of the flue unit 1. 1 Il.

Description

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The invention relates to the baking industry, in particular to baking ovens.

The purpose of the invention is to reduce the heating time, fuel consumption, reduction of ten-fold voltage of steam pipes.

According to the proposed method, because the chku.chemu.mu heating furnace surface j; conductive heating pipes, in meri:.; heating the furnace part of the waste. xi and nz returned to the heating system nech n mixed with flue gases. The mixture prepared in this way during this period is supplied simultaneously to both the thin and heat-transfer surfaces of the steam-water heating pipes.

The drawing shows the elements of the heating system of the furnace.

The heating system does not include a furnace 1, beams of steam-heating heating pipes 2 located in the heat exchange gas duct 3 and the baking chamber 4, gas flow controllers (5) 7-7, recirculation fan 8.

According to the method, during start-up, the furnace is ignited by a furnace 1 with a gas gateway 5, directing part of the raiiOEi to heat the furnace surfaces of pipes 2 to the heat exchange duct 3, and another part to heating the working surfaces of pipes 2 located in the baking chamber 4. The ratio of these parts is adjusted to gate 5, and the gate 6 is set to a middle position, providing for the selection of gases by the recirculation fan from the duct 3 and chamber 4 After the fan 8, some of the gases are directed to the furnace 1, and part in the amount determined by the position of the gate 7 is removed yut in atmospheres . As the furnace heats up and the temperature rises})) gases behind the recirculation fan 8, the gate 7 gradually increases the proportion of the gases taken for recirculation, i.e., the recirculation rate increases. When the furnace reaches the operating thermal condition, the gate 5 stops the supply of gases to the working surfaces of the pipes located in the chamber 4, and the gate 6 stops the extraction of these gases, after which the baking is done. When changing the heat selection in the baking chamber, the heat supply to

pipes regulate the amount of fuel burned.

The advantages of the proposed method in comparison with the prototype are achieved by reducing the heating time of the furnace.

before operating, it eliminates unproductive fuel consumption during interruptions of work. The lower the temperature of the gas mixture and the heating of the entire surface of the pipes when the furnace is heated, makes it possible to reduce the explosion hazard

pipes and increase their durability. A significant decrease in flue gas temperature due to recirculation and a shorter heating time of the furnace contribute to fuel economy.

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Claims (1)

Invention Formula The method of heating the furnace by supplying flue gas heating tubes to the furnace surfaces during the period 30 G Pzogreva and steady-state mode, characterized in that, in order to reduce Bj-OMeHH heating, fuel consumption, reduce thermal stresses of steam pipes, during the heating up period, the furnace is heated along the entire surface of the steam-heating pipes with a mixture of furnace and exhaust gas.