RU75719U1 - WATER-WATER TUBE HEAT EXCHANGER - Google Patents

Abstract

The utility model relates to a power system and can be used in boilers and heating systems. The task is to reduce scale formation in heat transfer tubes. A water-tube water heat exchanger contains vertical front and rear bypass ring collectors, divided into internal bypass sectors with radial transverse partitions. Pipes for supplying and discharging water are located on the front manifold. Rectilinear heat-exchange pipes with finned surfaces, on the forming of which metal plates are mounted, are arranged in rows in a checkerboard pattern around a central burner. The number of radial transverse baffles of the front manifold is twice the number of radial transverse baffles of the rear manifold. The collectors are located so that in the projection the lower bypass sector of the rear manifold overlaps the lower bypass sector and two halves of the adjacent sectors of the front collector.

Description

The utility model relates to a power system and can be used in boilers and heating systems.

Known hot water tube heat exchanger according to the patent for a utility model of the Russian Federation No. 34235, IPC 7 F24H 1/00, s. 07.24.2003, op. November 27, 2003, adopted as a prototype.

The hot water tube heat exchanger according to the prototype comprises vertical front and rear bypass ring collectors made of two cup-shaped flanges divided into equal internal bypass sectors with radial transverse partitions. The burner is located on the outer flange on the axis of the heat exchanger. Around the burner, in rows in a checkerboard pattern, there are rectilinear heat transfer tubes with finned surfaces, on the generators of which metal plates are installed with gaps between them along the axis of the heat exchanger. Pipes for draining and supplying water are located respectively at the top and bottom on the outer flange of the front manifold. Ring collectors are installed so that their internal bypass sectors are circumferentially offset relative to each other by 1/2 of their area.

Collectors with an equal number of radial transverse baffles installed with offset around the circumference relative to each other bypass sectors by half their area, provide for the separation of the incoming water flow in the rear manifold into two streams. A stream of water, once divided into two flows, passes through them through all pipes. If scale is formed in at least one pipe, all pipes of this stream will be in deteriorated

position due to reduced flow, which will cause surface boiling and further formation of scale deposits in other pipes of this stream.

The task underlying the utility model is to create a design that reduces scale formation in heat transfer tubes.

The task is achieved in that the water-heating water tube heat exchanger contains vertical front and rear bypass ring collectors divided into internal bypass sectors by radial transverse partitions, a central burner around which there are staggered straight tubes with finned surfaces in rows staggered, on the forming of which metal plates are mounted , and pipes on the front manifold for supplying and discharging water. What is new is that the number of radial transverse baffles of the front manifold is twice the number of radial transverse baffles of the rear manifold, and the collectors are located so that in the projection the lower bypass sector of the rear manifold overlaps the lower bypass sector and two halves of the adjacent sectors of the front manifold. This provides a two-fold increase in the area of each bypass sector of the rear manifold compared with the area of the bypass sector of the front manifold, which contributes to better mixing of the flow coming through the pipes from the front collector.

The sources of patent and scientific and technical information have not found the above set of essential features, which allows us to conclude that the claimed object meets the criterion of "novelty."

The device can be manufactured in industrial production using well-known technologies from modern

materials, which confirms the compliance of the utility model with the criterion of "industrial applicability".

The essence of the utility model is illustrated by an example of a water-heating water-tube heat exchanger with accompanying drawings, which depict:

figure 1 is a General view of a hot water tube heat exchanger;

figure 2 - the location of the heat exchange pipes relative to the burner, section aa in figure 1;

figure 3 - location of the bypass sectors of the collectors, section bB in figure 1;

figure 4 - the circulation system of the hot water tube heat exchanger.

The hot water tube heat exchanger has a front 1 and rear 2 bypass ring collectors located vertically. Each collector is made of two cup-shaped flanges 3, 4 - front and 5, 6 - rear collector. On the outer flange 3 of the front manifold, a central burner 7 and inlet 8 and water outlet 9 are installed. Two rows of finned heat exchange tubes 10 (sixteen tubes in each row) are staggered around the burner 7, and their ends enter the collectors 1 and 2 The flanges 3 and 4 of the front manifold have four radially located partitions 11, forming four bypass sectors 12 with eight heat transfer tubes in each. The flanges 5 and 6 of the rear manifold have two radially located partitions 13, forming two bypass sectors 14, each of which contains sixteen heat transfer pipes. The collectors are installed in such a way that in the projection the lower bypass sector 14 of the rear manifold overlaps the lower bypass sector 12 and two halves of the adjacent sectors of the front manifold. In order to improve heat transfer on finned surfaces

heat exchanging pipes 10 mounted metal plate 15, between which along the axis of the heat exchanger there are gaps for the exit of exhaust gases.

A hot water tube heat exchanger operates as follows. The cold water supplied through the supply pipe 8 enters the lower bypass sector 12 of the front manifold 1 and, through its eight lower heat exchange tubes 10, enters the lower bypass sector 14 of the rear manifold 2 with sixteen heat transfer tubes (Fig. 4). Regardless of the hydraulic resistance of the lower eight pipes, which may be different as a result of scale deposits in them, the entire incoming water stream converges in the volume of the lower sector 14 of the rear manifold, which is twice the volume of the lower sector 12 of the front manifold. Next, the water flow is distributed through the following eight pipes and two parallel streams enters again into the front manifold, in which it unfolds and moves through the next eight pipes in two parallel streams. In a twofold increase in the volume of the upper bypass sector of the rear collector, both flows converge and are distributed between the eight upper pipes, through which heated water enters the upper sector of the front collector and through it to the water outlet 9. Due to this distribution of water flow in the rear manifold, all heat exchanger pipes are in equal conditions for scale formation. The water flow through each of the eight upper and eight lower heat transfer pipes is determined only by its hydraulic resistance and does not depend on the hydraulic resistance of the channels to it. Water heating during movement is carried out by the flue gases of the burner 7, which enter the space formed by convective surfaces inside the heat exchanger, where the air-gas mixture is evenly distributed and burns near the heat exchange pipes.

Claims (1)

A water-tube water heat exchanger containing vertical front and rear bypass ring collectors divided into internal bypass sectors by radial transverse baffles, a central burner around which there are staggered rows of heat-exchanging pipes with finned surfaces in staggered rows, on which forming metal plates are installed, and placed on the front manifold nozzles for supplying and discharging water, characterized in that the number of radial transverse burns ca. front collector twice the number of radial transverse partitions adjustable collector, and collectors are arranged so that the lower projection adjustable bypass manifold segment overlies the lower bypass sector and two half its adjacent sectors of the front collector.