Waste heat boiler

Abstract

Waste heat boiler, comprising a large number of heat transfer tubes (3) and a centrally arranged bypass tube (4), which respectively have an inlet end (5) and an outlet end (6); means (7) for introducing water (31); including means (8) for introducing a high temperature waste gas stream (27) into the pipe inlet end (5) and passing the waste gas flow (27) through the pipe; including means for drawing out water A device (9) for steam / steam and a device (10) for withdrawing the cooled exhaust gas flow; including a regulating device (11), which can be adjusted axially by means of a device which is arranged on the outlet end of the bypass pipe and can be adjusted axially by means of the regulating device The plug (12) regulates the gas flow velocity and flow in the bypass pipe; the plug can be cooled by the cooling medium (32) and extends into the conically enlarged outlet end of the bypass pipe, and the gas circulation cross-section (22) is in the gas circulation The area ( 21 ) expands uniformly or non-uniformly irrespective of the position of the opened plug ( 12 ).

Description

technical field [0001] The invention relates to a waste heat boiler comprising a plurality of heat transfer tubes and a centrally located bypass tube in a cylindrical housing, each having an inlet port and an outlet port and including a regulating device for exhausting the waste heat boiler The temperature is kept within a certain temperature range. The present invention particularly relates to a waste heat boiler. In order to control the exhaust temperature of the waste heat boiler, its regulating device is installed on the outlet end of the bypass pipe. Background technique [0002] For many chemical and petrochemical processes, waste heat boilers require the flow of different gaseous and / or liquid media through the tubes and shell faces (channel side). Here, the high-temperature exhaust gas from the working process is usually fed to heat transfer tubes and bypass tubes which are arranged as tube bundles in the shell of the waste heat boiler. When the high-temperature ex...

AI Technical Summary

Problems solved by technology

In the adjusting plugs currently used, there is the disadvantage that the exhaust gas flowing out from the outlet end of the bypass pipe which is opened forms a strong plume. Risk of hot spots on the exhaust chamber walls

One or more of these hot spots cause thermal damage to the exhaust chamber wall, which in turn leads to undesired shortened maintenance intervals and reduced waste heat boiler life

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