DD254253A1 - METHOD AND ARRANGEMENT FOR TORQUE MEASUREMENT OF ROTATING MACHINES - Google Patents

Abstract

The task is to prevent the formation of ice formed by condensation of water vapor on tall chimneys at temperatures below freezing. This is achieved by air heated by the heat of the flue gas, passed to the chimney head and there outside the entire circumference evenly brought to Bestroemen the chimney head. The arrangement for freeing ice consists of one or more Luftschaechten between the chimney shaft and the flue pipe, which are guided with the lower end in the open atmosphere and the upper end are integrated into an outlet openings provided with annular channel at the chimney head. figure

Description

In the space between the chimney shaft 3 and the flue pipe 2, one or more air ducts 4 are attached. Below the chimney head 1, an annular channel 6 is arranged with leading outwardly at equal intervals outlet openings 7. The outlet openings 7 may be formed as nozzles, throw outlets or vane manifold. The one or more air ducts 4 are guided at its lower end by existing in the chimney shaft 3 or in these openings to be introduced into the open atmosphere. With its upper end 5, the air ducts 4 are integrated into the annular channel 6. The one or more air ducts 4 are provided with one or more heating registers 8, of which connecting lines 9 are guided in the interior of the flue pipe 2. The passage of the connecting lines 9 through the flue pipe 2 are sealed.

Via the openings in the chimney shaft, cold supply air is sucked into the air ducts 4 by the existing thermal buoyancy in the environment of the flue gas stream emerging from the chimney. In the air ducts 4, the air is heated by the existing temperature level of the flue gas and directed upwards into the Ringkahal 6. From there, the heated air is brought out via the outlet openings 7 uniformly outside over the entire circumference of the chimney. By the heating register 8 and the connecting lines 9, the heat transfer for heating the air in the air ducts 4 is amplified. If an average heating of the air in the air ducts 4 reaches 30 to 40 ^° C., sufficient supply of the chimney head 1 with heated air is ensured. The inventive solution prevents the formation of pieces of ice on the chimney head of tall chimneys and thus precludes the risk to people and equipment by falling pieces of ice.

Claims (3)

1. A process for Eisfreihalten the chimney head of tall chimneys, which are formed from a Schomsteinschaft and a separate flue, characterized in that air heated by the heat of the flue gas, passed to the chimney head and is brought out there evenly over the entire circumference for flowing the chimney head , 2. Arrangement for carrying out the method according to claim 1, characterized in that between the chimney shaft (3) and the flue pipe (2) one or more air ducts (4) and below the chimney head (1) an annular channel (6) leading to the outside Outlet openings (7) is arranged, the one or more air ducts (4) guided at its lower end in the chimney shaft (3) or introduced into these openings in the free atmosphere and incorporated with its upper end (5) in the annular channel (6) and the one or more air ducts (4) are provided with one or more heating registers (8), of which connecting lines (9) are guided into the interior of the flue pipe (2). 3 .. Arrangement according to claim 2, characterized in that the outlet openings (7) as nozzles, Cast outlets or vane manifolds are formed.
4. Arrangement according to claim 2, characterized in that the outlet openings (7) are arranged at a uniform spacing in the annular channel (6). For this 1 page drawing Field of application of the invention The invention relates to a method and an arrangement for Eisfreihalten the chimney head of tall chimneys, which are formed from a chimney shaft and a separate flue pipe. Characteristic of the known state of the art By falling below the dew point it comes to the condensation of existing water vapor and at temperatures below freezing to considerable ice on the projecting chimney head. These structures are often caused by external, uncontrollable circumstances, such as Wind, wholly or partially dissolved and thus pose a threat to the safety of buildings and machinery and the operating personnel. The determination of protection zones around the chimney is dependent on the chimney height and prevailing wind directions and usually not compatible with local conditions. Object of the invention The aim of the invention is to eliminate the risk to people and equipment by falling from high chimneys pieces of ice. Explanation of the essence of the invention The invention has for its object to prevent the formation of ice formed by condensation of water vapor at high chimneys at temperatures below freezing. According to the invention this is achieved in that air heated by the heat of the flue gas, passed to the chimney head and there is brought out evenly over the entire circumference for flowing the chimney head. The arrangement for carrying out the method is characterized in that between the chimney shaft and the flue pipe one or more air ducts and below the chimney head an annular channel with outwardly leading outlet openings are arranged, the or the air ducts with their lower end by existing in the chimney shaft or in this introduced openings introduced into the free atmosphere and incorporated with ir.rem upper end in the annular channel and the one or more air ducts are provided with one or more heating registers, of which connecting lines are guided into the interior of the flue pipe. The outlet openings are designed as nozzles, throw outlets or vane distributor and arranged in an advantageous manner at a uniform distance in the annular channel. embodiment The invention will be explained in more detail below using an exemplary embodiment. The accompanying drawing shows the half-section of a chimney with the arrangement for freeing ice. The high chimney is formed from a chimney shaft 3 and a separate smoke tube 2 and bordered at the upper end by a projecting chimney head 1.