F - Mech Eng,Light,Heat,Weapons – 23 – D
Patent
F - Mech Eng,Light,Heat,Weapons
23
D
F23D 14/00 (2006.01) F23C 6/04 (2006.01) F23C 9/00 (2006.01)
Patent
CA 2083248
ABSTRACT OF THE DISCLOSURE In a method of generating process heat, a process medium is heated in two stages to its final temperature in a process heat generator (100). Under- stoichiometric combustion is undertaken in the first stage as pre-combustion zone (107) which is located downstream of a burner device (101). Downstream of this pre-combustion zone (107), the combustion gases pass through a cooling phase which takes place by means of a heat exchanger (108). Further downstream of the heat exchanger (108), there is a reheat zone (110) and air (109) fed into this region is supplemented by cooled exhaust gas (112). This exhaust gas (112) can be introduced before the air (109) supplied or together with the latter in the region of the reheat zone (110). A further heat exchanger (111) is located downstream of the reheat zone (110). Because the exhaust gases (115) are branched off after the further heat exchanger (111), the latter has an effect on the combustion tem- perature in the reheat zone (110). In order to avoid thermal overloading of the combustion chamber walls in the pre-combustion zone (107), the air supply (106) takes place in a counter-flow convective heat exchanger (105) which preheats the air (106) supplied to the combustion air (15) and, on the other hand, cools the combustion chamber walls. The first heat exchanger (108) extracts only a part of the heat which should have been extracted to achieve the optimum temperature range, to minimize the NOx emissions, in the reheat zone (110). This is possible because the latter combustion zone is fed with cooled exhaust gas. In this way, it becomes possible to reduce the relative heat extraction in the pre-combustion zone (107) by any required amount and this improves the economy of the installation. (Fig. 1)
Asea Brown Boveri Ltd.
Keller Jakob
Swabey Ogilvy Renault
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