SU706647A1 - Water-steam heater - Google Patents

Description

(54) STEAM HEATER

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The invention relates to surface heat exchangers, in particular to low pressure preheaters of energy steam turbines and network water preheaters.

A steam heater is known, comprising a housing with a vertical tube bundle divided into sections by horizontal trays l. The trays collect the condensate of the heating steam and direct it through the corresponding openings in the tubes of the frame to the lower part of the body. In the sections, the steam moves from the periphery to the center of the preheater. In the central part of the apparatus, a vertical perforated tube is installed for the O-Roden air. A vertical perforated pipe is surrounded by tube bundles, some of which, located near the pipe, can function as a surfaced air cooler.

The disadvantage of this preheater is that when a special organization of surface air cools

The design is complicated and expensive because it requires additional separation of the autonomous expensive surface by heating under the air cooler, and high air concentration drastically reduces the thermal efficiency of this surface and contributes to an increase in the corrosion rate of the tubes in the IT site, which reduces the reliability of the apparatus.

The aim of the invention is to increase the efficiency of removal of non-condensable gases from the preheater.

This is achieved by the fact that at least the last two pipes are

5 pairs of beam rows are installed in annular gap trays for condensate drainage.

The drawing shows a steam heater, a slit.

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The heater contains Kopnj c 1, a water chamber 2, an air-blending device 3, a vertical bundle of pipes 4, divided into sections 5 by horizontal trays 6. In the box, sweep the vertical bundle 4 in horizontal trays 6 with an annular gap 7. At the bottom of the trays tips 8 for directional condensate drainage are installed under annular gaps 7.

During operation of the preheater, the flow of heated WATER enters the water chamber 2, then into the vertical bundle of pipes 4. In the tube bundle, a part of the tubes, installed in horizontal trays 6 with an annular gap 7, forms a film air cooler. Steam flow enters section 5, where its direction is organized by horizontal trays 6. Steam successively, passes all pipes of a vertical tube bundle, condensates MpyeTfcfl on them, and the vapor-air mixture enriched with air due to condensation of steam enters the film cooler, where there is supercooled condensate on the film flowing through the ring holes: condensation of steam from the steam-air mixture occurs and an increase in the air concentration in it, which increases the efficiency of removing non-condensable gases through es Breather device 3 is present.

The steam flow condensed on the supercooled condensate transits through the entire pipe system, increasing the average steam flow rate in it and reducing the possibility of formation of stagnant and poorly ventilated zones. Due to the more complete condensation of steam in the film cooler, conditions are improved for more complete removal of air, which increases the temperature of the feed water and, therefore, increases the efficiency of the heater as a whole.

Claims (1)

Claims of the invention A steam heater, comprising a housing with a vertical tube bundle divided into sections by horizontal trays, characterized in that, in order to increase the efficiency of removing non-condensable gases, the tubes are at least two. the latter along the pair of rows of the pooled are installed in trays with an annular gap for the condensate drain. Sources of information. into account during the examination 1. USSR Author's Certificate No. 317858, cl. F 22 2 1/32, 1971.