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FIG. 9 ms a schematic representation of an alternative configuration of the stoichiometry subsystem constructed in accordance with the present invention. FIG. 10 is a generalized schematic representation of an alternative configuration of the overfire air subsystem constructed in accordance with the present invention. FIG. Four is a schematic representation of the stoichiometry subsystem of FIG. Three constructed in accordance with the present invention. FIG. 11 is a schematic illustration of the overfire air subsystem of FIG. 10 constructed in accordance with the present invention. O 2 and whole unit air circulate, in addition to an override protection sign originating from the override safety subsystem. CCOFA damper controller 500 is further stimulated by a signal 54 originating from the furnace strain sensor 38 and consultant of the furnace pressure, a sign 50 originating from the windbox pressure sensor 34 and consultant of the absolute windbox strain and a sign 52 originating from the windbox temperature sensor 36 and representative of the windbox temperature. 526 clips this input signal 524 such that the excessive limiter gives as output a sign 528 which is consultant of the proportion of the maximum circulation capacity of the CCOFA dampers and is not going to exceed 100% of that quantity. 532 takes the distinction between the 2 input alerts 524, 528 and supplies as output a signal 534 representative of the p.c by which air circulate to the CCOFA dampers 550 exceeds their capacity.

530 offers as output a signal 544 which is representative of the percent demand placed upon the CCOFA dampers 550 and which acts as input to the plurality of signal generators S46. 500 is comprised of a sign converter 502, three sign multipliers 510, 518, 540, two sign dividers 514, 536, a excessive limiter 526, a signal differencer 532, a primary sign generator 506, a second sign generator 520, a third sign generator 530 and a plurality of signal generators every of which is designated by the reference numeral 546. All of the stated functional equivalents are operable in accordance with conventional observe. The utility mannequin discloses an ultra-low NOx combustion system of a hedging combustion boiler, which contains: the multi-row burners are organized along the water-cooled wall of the hearth of the boiler at intervals in the vertical path, and each row of burners comprises a plurality of burners; the first over-fire air nozzles are oppositely organized on the front water-cooled wall and the rear water-cooled wall of the hearth above the combustor and are communicated with a sizzling secondary air supply pipeline; and each pair of second overfire air nozzles are oppositely organized on the front and rear water-cooled partitions of the hearth above the primary overfire air nozzles and are communicated with the recent major air provide pipeline.

The tapered and flared mouth with regularly bigger route, the tapered and flared mouth of the isolated wind nozzle and the exterior secondary air type a contracted isolated wind nozzle 12, which accelerates the jet at the exit and increases its rigidity; the remoted wind channel 11 is outfitted with a The anti-scorch wind channel thirteen that absolutely diffuses the anti-coke wind by the strong swirl circulate, and the anti-scoke wind cyclone 15 that could cause robust swirl move is arranged within the anti-scoke wind channel thirteen . The anti-scorch wind adopts a strong swirling full-diffusion airflow, and since the tapered and flared angle of the remoted wind nozzle is smaller than the tapered and flared angle of the anti-scorch wind nozzle 14, the anti-scorch wind nozzle 14 is a oriented tapered and expanded After spraying out from the anti-scorch wind nozzle 14, it sticks to the wall and varieties an air film on the wall to prevent slagging and corrosion; the fully diffused airflow is a form of rotating jet circulate.

The isolation from the anti-scorch wind has a sure effect, which might forestall the anti-scorch air stream from being entrained by the combustion air circulate and becoming a member of the combustion course of too early, and the problem that the air film cannot be formed on the wall of the water-cooled wall. The utility model is supplied with an remoted air channel capable of isolating the wind by means of a direct-present kind between the secondary air channel and the anti-scorch air channel; and the isolated air nozzle adopts tapered growth, and the air stream is accelerated at the nozzle to reinforce its rigidity and It performs a certain role within the isolation of the combustion air move and the anti-scorch wind, so that the secondary air required for combustion and the anti-scorch wind don’t affect one another and do not interfere with one another, which might stop the anti-scorch air stream from being entrained by the combustion air circulate and becoming a member of the combustion prematurely During the process, the problem of not having the ability to type an air film on the wall of the water-cooled wall adheres to the wall. The utility model provides an anti-scorch wind channel that may absolutely diffuse the anti-scorch wind by sturdy swirling move, and at the same time cooperates with the tapered and flared design of the anti-scorch wind nozzle, which may type a layer of air movie on the water-cooled wall surface of the combustion space to forestall softening Ash slag adheres to the water wall, which also can effectively reduce corrosion and slagging.