SU1110995A1 - Multiple-way air heater - Google Patents

Abstract

A MULTI-WATER HEATER, containing shell-and-tube sections, interconnected bypass ducts, fitted with distributors located in their cavity, whose collectors are connected to the duct bypass pipes, which in order to increase reliability by reducing the temperature sweeps in the distributor area and simplifying the design of the design. pipelines are placed in the annular space of the first along the air flow shell and tube section.

Description

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The invention relates to heat exchange technology and can be used in boiler building.

Known multi-way heaters, containing shell-and-tube sections, interconnected bypass ducts connected to the duct bypass pipe 1

However, this air preheater is characterized by insufficient protection against low temperature corrosion due to the lack of means for high quality mixing of hot and cold air.

Closest to the technical effect and the effect achieved is a multiway air preheater containing shell-and-tube sections interconnected by bypass ducts equipped with distributors located in their cavity, the collector of which is connected to the duct bypass pipes 2.

The disadvantage of this air preheater is the reduced reliability due to temperature sweeps in the distributor zone due to the considerable distance of the cold air inlet points to it, as well as the complexity of the design.

The purpose of the invention is to increase reliability by reducing the temperature sweeps in the zone of the distributor and simplifying the design.

The goal is achieved by the fact that in a multi-port air preheater containing shell-and-tube sections interconnected bypass ducts, equipped with distributors located in their cavity, the collectors of which are connected to the duct by-pass pipelines along the shell-and-tube section along the air path.

In Fig.1 schematically shows the proposed heater, a longitudinal section, in Fig.2 - section aa in Fig.1.

Multi-way air heater contains shell-and-tube sections 1,

interconnected bypass ducts 2, fitted with distributors 3 located in their cavity, the manifolds 4 of which are connected to the duct 5 bypass pipes 6, placed in the annular space of the first shell-and-tube section 1 along the air course. jl duct 5 has a pre-connected heater 7 that is adjacent to the side walls of the input ends of the bypass pipelines 6.

The operation of the multi-way air preheater occurs in the following way.

The cold air is supplied to the air preheater by a duct 5, at the end of which it is divided into two streams. Single stream cold

air first passes through the bypass piping 6 and then through the openings of the distributors 3 exits into the bypass duct 2 connecting the heat exchange sections 1 of the first and second passages to each other. In air duct 2, this stream of cold air is intensively mixed with another heated stream of air that is directed from the supply air.

the duct 5 in the duct 2 through the heater 7 and the heat exchange section 1 of the first stroke. The resulting mixture of cold and hot air is directed through the overflow duct 2 to the heat exchange sections T of the subsequent passages.

The placement of the bypass pipelines 6 in the annular space of the heat exchange section 1 of the first stroke

dramatically reduces the distance between the cold air supply points in the distributor 3, which reduces the hydraulic sweep in the latter and the temperature sweep in

the first in the course of the air pipeline duct 2. This circumstance reduces corrosion in subsequent sections 1 of the air preheater and thereby increases its reliability.

At the same time, the bypass pipelines 6 do not block up access to the heat exchange section 1 of the first turn, which simplifies the design of the air preheater.

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Claims (1)

MULTI-WAY AIR HEATER, containing shell-and-tube sections, interconnected bypass ducts, equipped with distributors located in their cavity, the collectors of which are connected to the duct bypass pipelines, characterized in that, in order to increase reliability by reducing the temperature scans in the distributor area and simplifying the design, bypass pipelines are placed in the annulus of the first shell-and-tube section along the air.