CS269633B1 - Furnished to generate steam in the baking ovens - Google Patents

Abstract

The purpose of the solution is a simple reliable design of a device for generating steam in bakery ovens with high and high steam output and low permanent heat consumption. The device is suitable especially for mobile electric periodically operating bakery ovens. The device for generating steam in bakery ovens consists of a closed casing, a water inlet, a steam outlet and a nozzle, the casing is provided with at least one water inlet located inside the casing and at least one steam outlet, the outlet being provided with a water nozzle opening into a water reservoir formed in the casing.

Description

The invention relates to a device for generating steaming steam in baking ovens, comprising a closed jacket, a water supply, a steam outlet and a nozzle.

One of the first stages of baking at high relative humidity takes place in baking ovens. In periodic furnaces, the current whole charge is steamed in 2 to 3 minutes, which requires a source of steam with high and extreme power. 3a a number of spring developing devices are known. They are groove-shaped devices made of cast iron or steel, often built into the lining of the furnace. The disadvantage is the overheating of the steam at the beginning of evaporation, which has an adverse effect on the quality of the products, as well as frequent deformations and cracking of the breads due to their shape and rapid cooling. Chamber steam generators accumulating heat in the chamber shell are also known. In these developers, frequent deformations and cracks do not occur, but increase the ee of superheating of the steam, which is reflected in an increase in the scrap rate of bakery products. Longer flame boilers built into the furnace body are known, either with a separate heat source or connected in parallel to the furnace flue gas distribution. For periodically operating furnaces with steep steam extraction, they are unsuitable for large construction dimensions, weight and acquisition costs. In the case of continuous furnaces, tubular steam generators with separate water preheating or and integrated water heating are known, which use sensible waste heat of flue gases, air and vapors leaving the furnace. Axis for periodic steaming is disadvantageous because they do not cover short-term steep steam consumption. Also disadvantageous is their aggregation with water heaters, and already equal pressure or with a pressure drop, for a significant increase in acquisition costs and construction dimensions. Furthermore, electric resistance or electrode generators and high-pressure boilers are known with the possibility of using heat accumulated in superheated water with reduction of steam pressure. It is also known to aggregate these steam boilers and thermostats, which allow short-term steam extraction and high and steep output. They are unsuitable for steam steam manufacturers because the complexity of the equipment and the construction dimensions of these known devices significantly affect the acquisition costs as well as the construction dimensions of the baking ovens.

These disadvantages are eliminated by a device for generating steaming steam in baking ovens, the essence of which consists in the fact that at least one nozzle is discharged in a water sump formed inside the casing.

The advantages of the steam generating device in bakery ovens according to the invention over other known devices are the generation of pure steam without overheating, resistance to deformation and cracking, use of the oven's own heat without additional heat source, high and steep steam generation and uniform heat consumption and accumulation in throughout the cycle. A significant advantage is the automatic saturation of superheated steam depending on the pressure and superheating of the steam, which is reflected in the increase in the quality of bakery products.

The attached drawing schematically shows a device for generating steam in cross section.

The steam generating device according to the invention, shown in the drawing, consists of a solid steel jacket 1 located in a furnace 7 which is provided with a water inlet 2, opening inside the jacket 1 by means of distribution pipes 21. The jacket 1 is further provided with a steam outlet 3 and its shape forms a water sump 11 below the outlet 3. The bottom of the distribution pipes 21 opens above the water sump 11. The steam outlet 3 is narrowed at the inlet by a nozzle 4 and provided with a water nozzle 5 opening in the water sump 11. The water nozzle 5 is fixed to the casing 1 or nozzle 4.

After heating to the operating temperature of the furnace 7, the solid steel jacket 1 accumulates heat usable for evaporating water 6. The dose of water 6, introduced into the jacket 1 by the inlet 2 and the distribution pipes 21, is from the sentence! part of it is evaporated in the casing, the smaller part is sucked by the water nozzle 5 from the water sump 11 and sprayed into the outlet 3, where the heat of superheated steam evaporates. Gradual evaporation of the water 6 in the jacket 1 reduces its temperature, reduces the amount and overheating of the spring, its volume and the flow rate through the nozzle 4. This reduces the amount of water 6 sprayed in the steam outlet 3. The cross-section of the water nozzle 5 and its seating in the nozzle 4 must be selected depending on the operating parameters of the device.

Claims (1)

OBJECT OF THE INVENTION Apparatus for generating steaming in baking ovens, formed by a jacket, at least one water inlet, a steam outlet and a nozzle, characterized in that the at least one nozzle (5) opens into a water sump (11) formed inside the jacket (1).