Appeal 2007-1461
Application 10/463,956
regions. Black liquor fuel is delivered to the nozzles and mixed with
combustion air from ports 14, 16, and 18 (Fig. 1; col. 1, ll. 36-40 and
57-60) and burned.
8. Kychakoff desires to carry out all combustion in the lower regions of
the furnace (boiler 10) (col. 2, ll. 3-6). But the problem is that
disturbances in furnace conditions, such as disturbances in air supply
or high bed volume, sometimes result in the carry over of unburned
particles into the upper reaches of the furnace (Kychakoff, col. 2, ll.
6-50). Kychakoff describes detecting carryover particles using “plural
spaced apart discrete carryover particle detectors, each directed
toward an associated region of the interior of the furnace.” (col. 4,
ll. 50-54). The detectors may all be located in a single plane at
distributed locations about the periphery of the walls of the furnace
(col. 6, l. 68 to col. 7, l. 3). Figure 2 shows an embodiment with four
detectors 52, 52a, 52b, and 52c (col. 8, ll. 10-15). Detectors 52 and
52c are depicted as located on the wall above fuel input nozzles 32
and 34 (compare Fig. 1 and Fig 2).
9. In Kychakoff, individual detectors are focused on individual regions
of the furnace to detect carryover particles within those regions. Upon
detection of an excessive carryover particle count, the operator or
computerized controller adjusts air dampers 22, 24 and fuel valves 42,
44 to reduce carryover particle generation. For instance, the computer
may adjust a single damper or valve in response to the data (col. 8, ll.
2-9). The data is handled as follows:
The image processing subsystem 82 performs a number
of operations on the count data received from the interface
module. For example, the image processing system typically
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