SU64122A1 - Bakery Oven - Google Patents

Description

Baking and other ovens are already known, for example, for baking biscuits, which work to save fuel and recycle flue gases.

Such furnaces, however, do not give a high coefficient of useful effect and do not allow to easily regulate the modes and change them when rypechki various bread and confectionery products, and also do not have sufficiently durable furnace chambers due to the high temperatures developed in them.

We offer bakery

A solid-fuel stove (which is of course optional), equipped to pass recirculated flue gases with metal pipes placed in the baking chamber, is largely free from these drawbacks. The furnace has the peculiarity that the exhaust gases enriched with air coming out of the heating tubes of the baking chamber are taken in by the fan and fed under the Kiosk trap and through the injector into the channel above the combustion chamber to suck the combustion products from the latter. Taxi double flue gas path creates the necessary conditions for

maintaining in the furnace a flexible, in the sense of regulation, thermal conditions.

The drawing shows a longitudinal section of an exemplary form of the furnace.

The furnace is equipped with a horizontal chamber A made of double iron walls with a gap filled with highly efficient thermal insulation material. Inside the chamber passes the conveyor I, on which the products are laid.

The heating is carried out by metal (smoke tube) pipes 2 through which the hot exhaust gases are passed.

Heat transfer is carried out indirectly, i.e., hot gases transfer their heat to the products through the metal walls of the pipes, without direct contact with breads and the like.

The exhaust gases are driven through pipes 2 at high speed, which ensures good heat transfer from the gases to the walls of the pipes and then to the product l.

The furnace is equipped with a firebox B, the iB of which can burn any fuel. Combustion of solid fuels goes to the grill 3.

Lowering the temperature of the gases is easily regulated within the desired limits. This reduction is usually carried out to a temperature that precludes burnout of the metal; from which collectors and the heating pipes are made.

For final mixing of the gas streams, as well as for separating solid particles of fuel and ash carried away from the furnace, a dust separation chamber C is arranged. The particles of entrainment are collected in a hearth funnel 4, from which periodically are removed through the manhole 5.

From chamber C, the gases are transported through two or one gas 6 to metal manifolds 7 and then move along pipes 2 in two parallel streams, heating the product from the top and bottom. Passing through: pipes 2 and being sufficiently cooled, the gases are collected in the rear collectors 8 and further through the box-shaped iron channel 9 located in the furnace ceiling, and the vertical channels 10 flow to one or two fans 11 for recirculation. The pipes 2 heating the baking chamber are communicated at some distance from the ends through the collectors 12, channels 14 and burs 13 with the first gas flue 6, in case of need to raise the temperature of the right half of pipes 2 by adding flue gases and, in general, be able to regulate the temperature heating the baking chamber tubes.

Furnace exhaust gases from pipes 2 return through one or two channels to one or two circulation fans I. Some of the gases are emitted into the atmosphere through pipeline 15, and the other part is returned back through pipeline 16. Returned gases enriched air, partly injected under the grate through the pipe 17, and partly supplied through the conduit 18 and the injector 19 into the channel 20-21 above the combustion chamber to suck the combustion products from the latter. The combustion of the fuel is due to the oxygen contained in the gases injected under the grate 3. Oxygen enters the exhaust gases from the air, first of all, due to its discharge through the pipelines, collectors and chimneys (in the chimneys there is a fragmentation) and only in case of lack of oxygen (air), artificial suction is produced. through pipe 22, adjustable valve. Thus, the combustion of the fuel takes place in hot air. By virtue of the presence in the gases supplied to the grate ballast gas & in (C02, N2), the combustion temperature is significantly reduced. A further decrease in temperature is carried out by shifting the flue gases with the exhaust blown through the injector 19 into the channels 20-21.

The amount of gases supplied to the upper and lower rows of pipes 2 is regulated by valves installed on the rear manifolds 8. Adjusting valves are also installed on all pipelines where adjustment is necessary.

Hot surfaces of fans and pipelines are covered with a layer of highly efficient thermal insulation.

Subject invention

1. A solid fuel bakery oven with recirculation of flue gases flowing through metal pipes placed in a baking chamber, characterized in that exhaust gases enriched with air are released from the heating tubes of the baking chamber and are fed by a fan and fed the grate and through the injector into the channel above the combustion chamber to suck the combustion products from the latter.

2. An oven in paragraph 1, characterized in that the pipes heating the baking chamber are connected at some distance from the ends to the first gas flue for the addition of flue gases, in order to regulate the temperature in the pipes heating the baking chamber.