CS248416B1 - Heat exchanger for heat recovery from steam / gas mixture contaminated with insoluble impurities - Google Patents

Abstract

The invention relates to an exchanger for heat recovery from a mixture of steam and gas contaminated with insoluble impurities, in which the mixture is cleaned. The exchanger is formed in such a way that spray nozzles (5) are located in the inlet chamber (4) of the first pipe section (1). The outlet part of the first pipe section (1) is terminated by a separation chamber (6), which is connected by a control pipe (8) equipped with a siphon closure through a filter (9), a pump (10) and a recirculation pipe (7) with spray nozzles (5). Furthermore, the separation chamber (6; is provided with an overflow pipe (11) with a siphon closure. The first pipe section (1) is connected to the second pipe section (2) via a diverter (12) with an outlet (16) opening into the distribution chamber (13)

Description

(54) Exchanger for recovering heat from a steam / gas mixture contaminated with insoluble admixtures of fleet refers to an exchanger for recovering heat from a steam / gas mixture contaminated with insoluble admixtures for which cleaning of the mixture is solved. The exchanger is formed such that spray nozzles (5) are arranged in the inlet chamber (4) of the first tube section (1). The outlet portion of the first tube section (1) is terminated by a separation chamber (6) which is connected by a control line (8) provided with a siphon cap via a filter (9), pump (10) and recirculation line (7) with spray nozzles (5). Furthermore, the separation chamber (6) is provided with an overflow pipe (11) with a siphon closure. The first pipe section (1) is connected to the second pipe section (2) via a transducer (12) through an outlet (16) into the distribution chamber (13).

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The invention relates to an exchanger for the recovery of heat from a steam-gas mixture contaminated with insoluble impurities, such as the utilized drying environment from the drying kilns, the flue gas of some combustion processes, waste technological steam and the like

There are currently two methods known to solve this problem. The first method is that the cooled mixture of steam and gas passes through a scrubber (contact exchanger), in which the gas and steam hand over their superheat and the steam and condensation heat to the circulating liquid. purification transfers its heat in the surface exchanger to another medium (for example preheating air), but it is heated to a relatively low temperature · The second method solves the heat transfer in the convective exchanger (plate, tube, heat tubes and the like) with the heat exchange surfaces are easily clogged with substances that contaminate the mixture and easily subject to corrosion ·

These disadvantages are eliminated by the heat recovery exchanger from the steam-gas mixture contaminated by the insoluble impurities according to the invention, characterized in that spray nozzles are placed in the inlet chamber with the steam-gas mixture inlet of the first tube section of the heat exchange tubes. connected via a recirculation line through a pump, filter, connecting line containing a siphon closure to a separation chamber located on the underside of the first tube section. The separation chamber is equipped with an overflow pipe with a siphon cap and The surface of the heat exchange tubes on the side of the steam-gas mixture is provided with an anticorrosive layer.

The advantage of the heat exchanger according to the invention is that the disadvantages of the second method are eliminated and the advantages of the first method of the present solution are combined with a higher temperature level of the medium to be heated. with clogging of heat exchangers

248 416 tubes and the steam-gas mixture is cleaned so that it can be used in other sections · By providing heat exchange tubes on the inner side with an anti-corrosion layer a longer service life of these tubes is achieved ·

In the attached drawing, a two-section exchanger according to the invention is schematically shown.

The heat exchanger for the recovery of the steam and gas mixture contaminated with insoluble impurities consists of the first tube section J and the tube section 2 of the heat exchange tubes 2. In the inlet chamber 6 for the steam-gas mixture inlet there are heat exchange tubes 2 (smooth or external) The outlet part of the first tubular section 2 is formed by a separation chamber 6 which is connected via a discharge pipe 8 to a siphon cap, a filter 2 »a pump 10 and a recirculation line J with a spray nozzle 2 · The separation chamber 6 is additionally provided The second tubular section 2 is connected to the first tubular section 2 on the steam-gas mixture side via the separation chamber 6 through the transducer 12 and through the outlet 16 to the distribution chamber 22 »whose bottom is a tube sheet of heat exchange tubes 2» It continues to terminate in outlet chamber 14 with outlet p for the removal of steam-gas mixture · The second tube section 2 is provided with heated medium inlet 15 and the first tube section 2 is heated medium outlet 47 · The surface of the heat transfer tubes 2 and the steam-gas mixture is provided with an anticorrosive layer.

The steam-gas mixture enters from the inlet chamber 2 to the heat exchange tubes 2 of the first tube section 2. Inside these heat exchange tubes 2, the steam-gas mixture is cooled by the circulating liquid from the spray nozzles 2 heated to adiabatic saturation temperature of the steam-gas mixture in the separation chamber 6. Mixing reduces overheating of the incoming mixture and evaporates some of the liquid * The vapors formed condense on the film running down the inner walls of the heat transfer tubes 2 · Increasing the thickness of the condensation film prevents trapping of the liquid / thus preventing contamination of the heat exchange surfaces. air after separation of condensate from impurities

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3 in the separation chamber 6 proceeds through the transducer 12 with the outlet 16 into the distribution chamber 13 '' and into the heat exchange tubes 6 of the second tube section _2t where it transfers its heat to the heated medium entering the exchanger through 15. In the filter 10, the pump 10 is conveyed to the circulation pipe 8 and further to the spray nozzles.

Claims (2)

FRONT OF THE INVENTION An exchanger for the recovery of heat from a mixture of steam and gas contaminated with insoluble impurities, consisting of interconnected tube sections, characterized in that, into the inlet chamber (4) with the inlet for the steam-gas mixture inlet of the first tube section (1) of heat exchange tubes (3) there are spray nozzle walls (5) which are connected by a recirculation line (7) through a pump (10), a filter (9), a connecting line (8) comprising a siphon cap with a separation chamber (6) located at the outlet side of the first a pipe section (1), wherein the separation chamber (6) is provided with an overflow pipe (11) with a siphon cap and connected via a butt (12) to an outlet (16) for discharging the vapor-gas mixture which is connected to the distribution chamber (13) ) of the second tube section (2). Exchanger according to claim 1, characterized in that the surface of the heat exchange tubes (3) on the steam-gas mixture side is provided with an anti-corrosion layer.