Continuous flow steam generator with a two-pass boiler design

Patent metadata

Field	Value
Publication number	US-2016178188-A1
Application number	US-201414909610-A
Country	US
Kind code	A1
Filing date	Jul 25, 2014
Priority date	Aug 6, 2013
Publication date	Jun 23, 2016
Grant date	—

Abstract

A continuous flow steam generator includes a combustion chamber, having substantially rectangular cross-section and a lower and upper combustion chamber region, and has a horizontal gas pass connected downstream of the combustion chamber on the flue-gas side. Gas-tight and gas-permeable peripheral walls of the generator are completely or partly made of steam generator pipes welded together and through which a flow medium can flow, and collectors are arranged and connected to the steam generator pipes such that groups of steam generator pipes connected in parallel form heating surface segments of the peripheral walls. First passage collectors are arranged and connected such that the flow medium from first heating surface segments of two parallel first peripheral walls of the lower combustion chamber region are mixed with the fluid medium from second heating surface segments of second peripheral walls, standing perpendicular to the first peripheral walls, of the upper combustion chamber region.

First claim

1 . A continuous flow steam generator having
a combustion chamber which is of substantially rectangular cross section and which has a lower and an upper combustion chamber region, having a horizontal gas pass which is connected downstream of the combustion chamber at the flue gas side, wherein gas-tight and gas-permeable enclosure walls of the continuous flow steam generator are formed entirely or partially from welded-together steam generator tubes through which a flow medium can flow, and wherein collectors are arranged and connected to the steam generator tubes such that groups of steam generator tubes connected in parallel form heating surface segments of the enclosure walls, and first passage collectors are arranged and connected such that the flow medium from first heating surface segments of two parallel first enclosure walls from the lower combustion chamber region can be admixed to the flow medium from second heating surface segments of second enclosure walls, which are perpendicular to the first enclosure walls, from the upper combustion chamber region.

2 . The continuous flow steam generator as claimed in claim 1 ,
wherein the second enclosure walls are a front wall and a rear wall assembly, formed from a part of the rear wall, from a nose and from a grate, of the upper combustion chamber region, and furthermore the first enclosure walls are two side walls of the lower combustion chamber region.

3 . The continuous flow steam generator as claimed in claim 1 , further comprising:
second collectors and at least one downpipe are arranged and connected such that the flow medium from the second heating surface segments of the second enclosure walls of the upper combustion chamber region can be supplied to third heating surface segments of the first enclosure walls of the upper combustion chamber region.

4 . The continuous flow steam generator as claimed in claim 3 ,
wherein via the at least one downpipe, flow medium can be supplied to the fourth heating surface segments of lateral enclosure walls of the horizontal gas pass and/or to a combustion chamber outlet grate arranged at the transition between upper combustion chamber region and horizontal gas pass.

5 . The continuous flow steam generator as claimed in claim 1 wherein the first collectors are connected such that flow medium from heating surface segments composed of corner wall regions of the first enclosure walls from the lower combustion chamber region can be supplied and/or admixed to central wall regions of the second enclosure walls of the upper combustion chamber region.

6 . The continuous flow steam generator as claimed in claim 1 wherein the first collectors are connected such that flow medium from heating surface segments composed of central wall regions of the first enclosure walls from the lower combustion chamber region can be supplied and/or admixed to corner wall regions of the second enclosure walls of the upper combustion chamber region.

Assignees

• Siemens Ag

Inventors

• Brodesser Joachim
• Effert Martin
• Schulze Tobias

Classifications

• F22B29/06

  of once-through type, i.e. built-up from tubes receiving water at one end and delivering superheated steam at the other end of the tubes (combined low- and high-pressure boilers of forced-flow type F22B33/16) · CPC title

• F22B21/345 Primary

  with a tube bundle between an upper and a lower drum in the convection pass · CPC title

• F22B21/34 Primary

  built-up from water tubes grouped in panel form surrounding the combustion chamber, i.e. radiation boilers · CPC title

• F22B29/062

  involving vertically-disposed water tubes · CPC title