SU1185027A1 - Recuperative heat-exchanger - Google Patents

Abstract

RECOVERATIVE HEAT NIK, comprising a housing with channels for the passage of heating medium heated, the inputs and outputs of the channels of the heating medium are interconnected by bypass pipelines with gates of flow direction switching, characterized by the more complete use of heat exchange surfaces, the inputs and the outlets of the heated medium channels are interconnected by additional by-pass pipelines with their own flow direction switches, additionally connected control line with the first gates.

Description

one

The invention relates to heat-transfer engineering and can be used in heat-using devices.

The purpose of the invention is to increase efficiency by more fully utilizing heat exchange surfaces.

The drawing schematically shows the proposed heat exchanger.

The recuperative heat exchanger includes a housing 1 with channels (not shown) for the passage of heating and heated media. The inlet 2 and the outlet 3 of the heating medium channels are interconnected by the bypass pipes 4 and 5 by the gates 6-9 for switching the flow direction. The inlet 10 and the outlet 11 of the heated medium channels are interconnected by a bypass pipe 12 and 13 with the gate valves 14 - 17 for switching the flow. Shibers 6-9 and 14-17 are interconnected by a control line 18 connected to a switch regulator 19.

The heat exchanger operates as follows.

First, the gate 6 overlaps the pipeline 4, the gate 7 - the pipeline 5, the gate valves 8.9 and 14 - 17 block the pipelines 5,4,13 and 12. Consequently, the heating medium through the inlet 2 enters the channels of the housing 1 and releases heat to the walls through the wall 2 passing in adjacent channels of housing 1, heating it. After the heat exchange is completed, the heating medium leaves through outlet 3 and is heated through outlet 11. During the heat exchange process, the walls of the heat exchange channels of the casing to the zones where the temperature drops below the dew point of sulfuric acid vapor, begin to undergo sulfuric acid corrosion. Condensation of sulfuric acid vapor causes the growth of sooty deposits on the walls, which impairs the use of the heat exchange surface and reduces its intensity. To avoid this

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the undesirable effect, the direction of movement of the heat exchange media is periodically reversed, which removes the aforementioned part of the heat exchange surface from the corrosion zone. For this, the signal from the regulator 19 through the control line 18 switches the gates 6 and 7 (the pipe 5 is connected to the input

10 2 heating medium) and gates 8 and 9

(pipe 5 is connected to housing 1). Due to these switches, the heating medium begins to pass through the channels of housing 1 in

15 direction opposite to the period of operation before switching. At the same time, on the same signal from the regulator 19, gate valves 14 and 15 are switched through the line (pipeline 13 is connected to the input 10 of the heated

environments) and gates. 16 and 17 (pipe 12 is connected to outlet 11 of a heated medium). Thus, the heated medium begins to move in the opposite direction to the period of operation before switching. As a result, the nature of heat transfer (flow, counter flow) is maintained. In addition, the surface of the heat transfer on, prone to corrosion in the period preceding the switch over, leaves the corrosion-hazardous zone, drying and removal of sediment occurs, which improves heat transfer. During the operation, with this direction of movement of the heat exchangers, the second corrosive zone appears at the other end of the heat exchanger. Therefore, after a certain time has elapsed, the direction of the flow of heat exchange media is reversed, and so on. Due to the periodic switching of the direction of movement of the heat exchanging media, the deposits are removed from the reshaping surface, which increases the efficiency of heat transfer without stopping the heat exchange. In addition, the service life of corroded surfaces.

doubles.

Claims (1)

A RECOVERABLE HEAT EXCHANGER, comprising a housing with channels for passing heating medium heated h, the inputs and outputs of heating medium channels being interconnected by bypass pipelines with flow direction switching gates, characterized in that, in order to increase efficiency by making better use of heat exchange surfaces, the inputs and the outputs of the channels of the heated medium are interconnected by additional bypass pipelines with their flow gate switching gates, additionally connected lines th with the first control dampers.