SU974032A1 - Platen - Google Patents

Description

(54) SCREEN

The invention relates to power engineering and can be used in convective waste heat boilers and power technology units.

A known screen containing an evaporative heating surface, made in the form of bent heat exchange tubes with vertical chambers located in the duct and included in the circulation circuit 1,

However, such screens are difficult to manufacture and assemble and practically not maintainable.

Also known is a screen containing inclined or horizontal heat exchange tubes with inlet and outlet headers located in a vertical plane, the first of which is connected through a sludge collector. Sludge is removed from such a screen through a sludge collector connected to the lower ends of the inlet manifold 2,

However, such a structure does not provide reliable cooling of the heat exchange tubes due to the uneven distribution of the heat transfer medium over them,

Closest to the proposed technical solution is a width containing heat exchangers.

mostly inclined, located in the duct in the same vertical plane and provided with a vertical distributing manifold with upper and lower nozzles, the upper of which has a larger diameter than the lower one and connected to the supply pipeline, the distributing collector communicating the lower part with the distributor outside the duct 3 ,

A disadvantage of the known screen is low reliability due to agglomerated hydraulic sweep and large sludge deposits.

The purpose of the invention is to increase reliability by reducing hydraulic sweep and sludge deposits,

This goal is achieved by the fact that the screen is equipped with a bypass pipe connecting the supply pipe with the bottom of the dispensing manifold through the cavity of the sludge collector, which is communicated to its collector 25 through its lower pipe,

The drawing shows a schematic representation of the proposed folding screen, a general view.

Claims (3)

The screen contains heat exchange tubes 1, mostly inclined, located in the duct 2 in the same vertical plane and equipped with a vertical dispensing coke / tector 3 with the upper 4 and lower 5 nozzles, the upper of which has a larger diameter / than the lower one and is connected to the supply pipeline b The dispensing collector 3 is connected to the lower part with a sludge tank 7 placed outside the flue duct. The screen is also provided with a bypass conduit 8 connecting the supply conduit 6 to the bottom of the dispensing manifold 3 through the cavity sludge collector 7, which is communicated in turn with this collector through its pipe 5. The process of generating heat in the screen is carried out as follows. The coolant through the supply pipe 6 is fed through the top 4 and bottom 5 nozzles connected by a bypass pipe 8 to the vertical distribution manifold 3 and further along the heat exchange pipes 1, where it is heated by the heat of flue gases in the duct 2. Since the diameter of the lower nozzle 5 is less than the diameter of the upper nozzle 4, the coolant velocity in the sludge trap is less than in the upper inlet pipe 4, which contributes to a more intensive deposition of sludge in it, which is then drained through the drain. Through the top 4 and bottom 5 nozzles connected to each other by the bypass pipe 8, the distributing collector 3 also reduces the hydraulic expansion at the outlet of the heat exchange pipes 1. The implementation of a screen equipped with a bypass pipe connecting the supply pipe to the bottom of the distributing collector through the sludge collector cavity, which communicated in turn with this collector through its lower branch pipe, makes it more efficient to use it. Claims of the invention A screen containing heat exchange tubes, mainly inclined, located in the duct in the same vertical plane and provided with a vertical distribution manifold with upper and lower nozzles, the upper of which has a larger diameter than the lower one and connected to the supply pipeline, the distributing manifold communicating with the lower part with a sludge trap located outside the flue, characterized in that, in order to increase reliability by reducing hydraulic sweep and sludge deposits, it provides wife bypass pipeline connecting the supply pipeline with the lower part of the distributing collector through the cavity of the sludge collector, which is in turn communicated with this collector through its lower branch pipe. Sources of information taken into account during the examination 1. USSR author's certificate tf 220268, cl. F 22 D 7/14, 1967. 2. The patent of Germany No. 1185197, cl. 13 a 10/20, 1965. 3. USSR author's certificate No. 79498, class, F 22 V 17/00, 1948.