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Thermal state of a given vertical pipe air preheater design


Obtained satisfy (2 ± = 38, \Then from (33) operator 6 'limits,[link widoczny dla zalogowanych], the results shown in Table 2. Table 2 shows that, subject the two-stage air preheater flue cross-section the same size, 6 Fan, values can only be b = 3.17 ~ 3.85llfl. Table 3 without loss of generality, take b. = 3.6,3.8 m,[link widoczny dla zalogowanych], corresponding b0 = 1.55,1.35 m. Using (34) ~ (39), available Table 3. lao'mln! amx 【Sm; n1Smxl. . E-class 1.451.511.451.51586D. 43.6 program ~ f1 ・ 541.6l1.541.6161.6.43.6 higher 1.481.541.481.545 mouth. 261.63.8 program two lower 1.571.651.51.6162.86I. T-way thermal power 43.8 '274 literature in 1991 (13 recommended tube pitch (table) li60l64I68l7277I & 2__T2l Table 4 with a horizontal pitch s Table 3 limits, it is desirable pitch design value: higher S 【= 60mm, S2 = 40mmJ lower SI = 64m, s = 41mm. both in the design values listed in Table 4.6 '】 L. ●, W-lK at higher 3.690I,[link widoczny dla zalogowanych], 10l25441O9573.7811.95.46l0.d5816.d1d815 treatment a lower case i ___--。。。-- higher 3.86040l2546114553.66l1.15.64l9.49416.21487 + I treatment 3.664d11l7297B78.3510.8d.850.d4916.32g503 case II ●. _ - -f --- lower 3.894l1451OB67.98lO.15.970.5O3l5.9d9731 be seen from Table 4, the two programs are to meet the constraints (24) ~ (27) design allows the solution decreases when b,[link widoczny dla zalogowanych],,, L increases, the heated area of H reduction. which concluded that the flue at the rear to allow the premise of sending degrees, select a smaller program can save heating surface. the original design of b = 3.8m,. h-level air pre- heat = 0.538, to meet the economic conditions. but lower Lu = 0.767,[link widoczny dla zalogowanych], contrary to the economic conditions. The problem is the improper selection of the pitch (s 【= 6Omm, S = 4Omm), only select S 【Table 4 = 64mm, S = 41mm, to make lower-level design is also economical and reasonable. The above examples illustrate the calculation of the recommended design method is feasible and practical. designers depending on the circumstances, a reasonable selection of programs from more than design. For the formula, Even if the hand count can be completed. References 1 Department of Electrical Engineering, Tsinghua University teaching and research technetium furnace. {I} Bute and calculation of the original furnace. Beijing. Science Press .1979 TheDesignofVerticalTypeStemTubeAirPreheaterUnderGivenThermotechniealConditionsHongZuyan, FanZhiming, LiL (HangzhouBeiletWorks) TheeffectofeconomiesOllthedesignofverticaltypesteeltubeairprcheatcrisdiscussedwiththestructuraldesignformulabeinggiven.Theeelcula-tionmethodintroducedinthispaperisusuallyusedasthesub-procedureofaboilersystemthermaldesigncalculation. Thepresentmethodconstitutesawholecalculationprocessofairprchcaterdesignineasethethcrmotee / miealconditionscallbedireetlydeterminedbyboilerdesignparameters.Keywords: airpreheater, design
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