SU881516A1 - Heat exchanger - Google Patents

Description

one

The invention relates to power engineering and can be used in devices for utilizing the heat of waste gases.

A heat exchanger is known comprising a vertical case with a horizontal grid and a layer of dispersed material with heating surfaces immersed in it, as well as a vertical pipe passed through the grid with upper and lower ends located respectively above and below the layer of dispersed material, with the lower end of the pipe positioned with a gap with respect to the conical bottom of the housing, and the latter is provided in the area above the layer of dispersed material with inlet and outlet connections a.

The benefits of such a heat exchanger are reduced heat recovery of waste gases, reduced efficiency of heat exchange and increased corrosion.

The purpose of the invention is to increase the utilization of the heat of waste gases, intensify heat exchange and reduce corrosion.

This goal is achieved by the fact that the heat exchanger is equipped with a gas-pressure pipe fixed in the bottom of the housing, the cavity of the latter in the zone above the layer of dispersed material is connected to the upper end of the vertical pipe, and the diameter of the lattice holes exceeds the maximum dimension of the dispersed material.

In addition, the lower end of the vertical pipe can be made in the form of an ejection throat located opposite the gas-pressure branch pipe, provided at the outlet with a safety grid.

The drawing shows schematically

15 heat exchanger, general view.

The heat exchanger contains a vertical body 1 with a horizontal grid 2 and a layer of dispersed material 3 with immersed heating surfaces 4, as well as a vertical pipe 5 passed through the grid 2 with upper and lower ends located respectively above and below the layer of dispersed material 3. Lower end the pipe 5 is placed with a gap relative to the conical bottom of the casing 1. The casing 1 is provided in the area above the layer of dispersed material 3 with inlet and outlet pipes 7 and 8

30 respectively. The heat exchanger is equipped with a gas-pressure pipe 9 fixed in the bottom 6 of the housing 1, the cavity of the latter in the zone above the layer of dispersed material 3 is connected to the upper end of the vertical pipe 5, and the diameter of the openings of the lattice 2 exceeds the maximum dimension of the dispersed material 3. The lower end of the vertical pipe 5 is made in the form of an ejection head located opposite the gas-pressure inlet 9, provided at the outlet with a safety grid 10,

The heat exchanger operates as follows.

Through the gas-pressure connection 9, the gorzych gases which eject the dispersed material from the cavity of the housing 1, located under the grate 2, and transport it through the pipe 5 into the cavity of the housing 1, located above the layer of the dispersed lateral 3, are fed. During the ascending and descending movement, the dispersed material 3 is heated, washed by a stream of hot gases that flow through pipe 7, cooled as a result of contact with material 3 and cooled out of housing 1 through pipe 8, heated dispersed material 3 is lowered and is in contact with With the heating nozzles 4, the heating medium passing over these surfaces is cooled. The cooled dispersed material through the holes of the horizontal grid 2 falls into the cavity of the housing 1 located under the grid 2, and the cycle is repeated again. The grill 10 prevents the gas-pressure nozzle 9 from clogging it with material 3,

Such a heat exchanger makes it possible to utilize the heat of waste gases of both conditionally clean and dusty, containing aggressive substances. This is achieved in that direct contact of the gases with the surfaces 4 of the heating is not carried out. So

thus reducing corrosion. In addition, the heat exchanger allows you to create a counter-current, contributing to the intensification of heat exchange and increase heat recovery of waste gases.

Claims (2)

1. Heat exchanger containing a vertical case with a horizontal grid and a layer of dispersed material with heating surfaces immersed in it, as well as a vertical pipe passed through the grid with the upper and lower ends located respectively above and below the layer of dispersed material, the lower end of the pipe is placed with a gap relative to the conical bottom of the housing, and the latter is provided in the area above the layer of dispersed material with supply and discharge nozzles, In order to increase heat utilization of waste gases, intensify heat exchange and reduce corrosion, it is equipped with a gas-pressure pipe fixed in the bottom of the case, the cavity of the latter in the zone above the layer of dispersed material is connected to the upper root of the vertical pipe, and the diameter of the lattice holes exceeds the maximum dimension of the dispersed material. 2. A heat exchanger according to claim 1, 1, which is based on the fact that the lower end of the vertical pipe is made in the form of an ejection throat located opposite the gas-pressure branch pipe, provided at the outlet with a safety grid. Sources of information taken into account in the examination 1. USSR author's certificate 723355, cl. B 28 D 13/00, 1979.