US2012160188A1PendingUtilityA1

System for Heating a Primary Air Stream

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Assignee: CHEN CHAO HUIPriority: May 27, 2009Filed: May 26, 2010Published: Jun 28, 2012
Est. expiryMay 27, 2029(~2.8 yrs left)· nominal 20-yr term from priority
Inventors:Chao Hui ChenMeng-Che LiMichael J. Smith
F01K 17/06
40
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Claims

Abstract

A system for heating a primary air stream in a steam generating process comprising at least one primary air heat exchanger to exchange heat between the primary air stream in the primary air heat exchanger(s) and a process fluid.

Claims

exact text as granted — not AI-modified
1 . A system for heating a primary air stream in a steam generating process comprising at least one primary air heat exchanger to exchange heat between the primary air stream in the primary air heat exchanger(s) and a process fluid. 
     
     
         2 . A system in accordance with  claim 1  comprising two or more primary air heat exchangers. 
     
     
         3 . A system in accordance with  claim 2  wherein the primary air heat exchangers comprise at least one high pressure heat exchanger and at least one low pressure heat exchanger. 
     
     
         4 . A system in accordance with any one of the preceding claims wherein the process fluid comprises two or more streams. 
     
     
         5 . A system in accordance with  claim 4  wherein each process fluid stream passes through a separate primary air heat exchanger. 
     
     
         6 . A system in accordance with any one of the preceding claims wherein there is provided no tempering air source supply into the primary air stream. 
     
     
         7 . A system in accordance with any one of the preceding claims wherein the primary air stream comprises two or more primary air streams, each primary air stream comprising the same or different characteristics, properties and/or composition, including but not limited to flow rate, flow volume, temperature, pressure, oxygen content and recycle gas content. 
     
     
         8 . A system in accordance with  claim 7  wherein each primary air stream passes to a respective pulveriser. 
     
     
         9 . A system in accordance with  claim 7  or  claim 8  wherein each primary air stream is separately heated by separate primary air heat exchanger(s). 
     
     
         10 . A system in accordance with any one of the preceding claims wherein the process fluid is water and/or steam from a boiler of the steam generating process. 
     
     
         11 . A system in accordance with any one of the preceding claims wherein the process fluid is a process liquid. 
     
     
         12 . A system in accordance with  claim 11  wherein the process liquid is water. 
     
     
         13 . A system in accordance with  claim 12  wherein the process liquid is feedwater for a steam generator. 
     
     
         14 . A system in accordance with  claim 13  wherein the process liquid is a portion of a feedwater stream to be processed by a steam generator of the steam generating process. 
     
     
         15 . A system in accordance with  claim 14  wherein the process liquid is a slipstream of the feedwater stream to be processed by the steam generator of the steam generating process. 
     
     
         16 . A system in accordance with any one of  claims 13  to  15  wherein the feedwater is provided from the feedwater stream in the steam generating process between the steam condenser and the exit of the steam generator economiser. 
     
     
         17 . A system in accordance with any one of the preceding claims wherein the primary air stream passes to one or more pulverisers after being heated by the primary air heat exchanger(s). 
     
     
         18 . A system in accordance with any one of the preceding claims wherein none of the primary air heat exchanger(s) are gas-to-air heaters. 
     
     
         19 . A system in accordance with any one of the preceding claims wherein the primary air stream is preheated by at least one separate process fluid preheat exchanger. 
     
     
         20 . A steam generation system comprising a steam generator such as a boiler and a system for heating a primary air stream as defined in any one of  claims 1  to  19 . 
     
     
         21 . A method of heating a primary air stream in a steam generating process comprising at least the step of:
 passing a process fluid through one or more primary air heat exchangers to exchange heat from the process liquid to the primary air steam in the primary air heat exchanger(s).   
     
     
         22 . A method in accordance with  claim 21  comprising heating the primary air stream using a system as defined in any one of  claims 1  to  17 .

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