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The coolant at the boundaries of the grate by Wendy zong
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The coolant at the boundaries of the grate |
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Business,Business Opportunities,Manufacturing
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Because of the cooling of the grate with the liquid coolant water, the temperature at the surface of the grate bar is 90 to 110° C. The result is a reduction of the wear of the grate and the grate has a high thermal load-bearing capacity of 0.9 to 1.1 MW/m 2 grate area. This leads to the fact that the inventive grate can be built smaller by about 30% as compared to the known travelling grate with the same thermal efficiency. The meander-shaped design of the channels arranged in the interior of the grate bars, through which flows the coolant, and the connecting, inlet and outlet pieces to be used in accordance with the invention advantageously cooperate such that the supply and discharge of the coolant is only effected from the boundaries of the grate. The individual blocks of grate bars or several blocks of grate bars can thus be provided with the coolant at the boundaries of the grate, so that the operational safety is increased. The connecting pieces ensure that between the individual grate bars, of which a block of grate bars consists, grate slots are formed, which do not change their width during the operation. This high dimensional accuracy of the inventive firing grate ensures both a minor passage of ash through the grate and an optimum supply with combustion air and a substantial burn-out of the fuel on the grate, so that finally a high thermal load is achieved.
In accordance with the invention it is furthermore provided the connecting, inlet and outlet pieces enclose a grate bar carrier and are screwed to the carrier. The meander-shaped channels of the grate bars are connected with each other via the connecting passages of the connecting pieces. The dimensional accuracy of the blocks of grate bars and the operational safety of the travelling grates are thus increased.
In accordance with the invention it is particularly advantageous that the individual grate bar blocks can be moved by means of the grate bar carriers, and/or that the firing grate has an angle of inclination of 8 to 11°. The movability of the grate bar blocks does not reduce the operational safety of the firing grates designed in accordance with the invention. The inventive firing grate may be designed for instance as an inclined counterflow grate or as an inclined feed grate or as a horizontally arranged feed grate. source:news jinma-boiler
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