SU1620799A1 - Combined surface of heat transfer - Google Patents

Abstract

The invention relates to heat engineering and can be used as convective heating surfaces of boiler units or other heat exchanger devices. The purpose of the invention is to simplify the assembly and dismantling of the heat exchange surface by ensuring free removal of damaged coils with transverse fins in the transverse direction to the pipe axes from its tube bundle. The heat exchange surface has alternating coils of pipes 1 with transverse and pipes 2 with longitudinal ribs. Pipes 1 coils with transverse ribs are interconnected in a corridor order, and pipes 2 coils with longitudinal ribs are interconnected in a checkerboard pattern. The steps of the tube bundle satisfy the specified ratios. Due to the free removal of emergency coils from the tube bundle, the maintainability of the heating surface increases and. its service life. 1 il. with S8

Description

The invention relates to boiler technology and can be used in convective heating surfaces of boilers or other heat exchangers.

The purpose of the invention is to reduce assembly and dismantling works by removing coils with transverse ribs in the transverse direction to the pipe axes.

The drawing shows a cross section of the surface.

The combined heat exchange surface can be made in the form of alternating coils of pipes 1 with transverse and pipes. with longitudinal ribs, with pipes 1 of the coils with transverse ribs are interconnected in the corridor order, and

2 coil pipes with longitudinal ribs are arranged in chess order, In addition, the conditions are met that the tube bundle steps Sf and S satisfy the ratios

(1,5d + 2h -t-, (2d + 2h);

So r 0.5 2 ((Y «T + 2h) 2 - S), where d is the diameter of the pipes;

h is the height of the transverse edge;

b is the thickness of the longitudinal rib;

S | - transverse pitch of the tube bundle;

Sg is the longitudinal pitch of the tube bundle.

The proposed arrangement of the tube bundle of the combined heat exchange surface leads to an increase in the slE

WITH

x

standing between the pipes of adjacent coils with longitudinal ribs compared with the known to such a value that coils with transverse ribs can be freely removed from the tube bundle 3 of the combined heat exchange surface in the direction opposite to the axes of the pipes.

During operation, the flow of heat-transfer fluid directed to the heat exchange surface is divided into separate turbulent flows, washing pipes 1 and 2 of the heat exchange surface.

The proposed heat exchange surface is convenient in operation, since it is possible to freely remove emergency coils from a tube bundle placed in a gas duct with non-separable walls (for example, a boiler gas duct with screens from gas-tight membrane panels) in the transverse direction to pipes 1 and 2 axes.

Increasing the maintainability of the heating surface allows to increase its service life, reduce the cost of repair and restoration work and leads to an increase in its reliability as a whole.

Sf

Claims (1)

Invention Formula The combined heat exchange surface, containing alternating order in parallel planes coils of pipes with field and longitudinal fins, with pipes with transverse ribs located between themselves in the corridor order, characterized in that In order to simplify installation and assembly works by removing coils with transverse ribs in the transverse direction to the pipe axles, pipes with longitudinal ribs are arranged in chess order, with the transverse and longitudinal arms of each bundle. have magnitude component: (1.5d + 2h + 0.5b) “Ј S (2d + 2h); Si 0.5V 2 ((2d + 2h) 2 - S, 2) ,. i where d is the diameter of the pipes; h is the height of the transverse edge; b is the thickness of the longitudinal rib; Sf is the transverse beam pitch; Sit-longitudinal beam hague.