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 Wysłany: Pią 8:25, 26 Lis 2010 Temat postu: ghd deutschland Circulating fluidized bed boiler t |
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Circulating fluidized bed boiler thermal shock resistance of membrane lining the fireplace Study
2 four thermal shock stability of the sample shown in Table 1. 4 Heat Transfer and Thermal Power Film fireplace 386 [2000 is fine (Geh'iart classification Class A and Class 8 particles) circulating fluidized bed heat transfer to the wall for the radial thermal conductivity of solid particles group, distributed phase of heat and radiation heat transfer, including two-phase 2 in which the radiation heat transfer is the main heat transfer. Therefore, the actual working conditions of the test was simplified under the experimental conditions is dominated by radiation heat transfer, this does not affect our fireplace on the membrane lining the structure of thermal shock resistance. The results showed that, l and 3, strong thermal shock resistance of the sample, can safely withstand 15 times the water quench thermal shock method. 2 and 4, the sample is relatively weak thermal shock resistance, and breakage rates are relatively large, about 8% and lO%. L No. 4 and one sample of the tube pitch (1 ∞ n) and diameter (51n) are the same, but the pin 4, the number of samples of samples less than 1 4o%, compared with the results of thermal shock resistance 1, weak. 3 samples and 2 samples have the same tube pitch (_6.2mm) and diameter (051m), but the number 3 pin specimens less than 2, 54% of the sample, but thermal shock resistance strong than 2. We found in possession of the pitch and pin density for membrane lining the thermal shock resistance of the fireplace to a certain extent, this is our structure in the design of membrane lining the fireplace should be taken into account. Because the boiler is full of shape and degree of the torch,[link widoczny dla zalogowanych], the torch of the temperature field, velocity field is uneven, and the membrane lining the fireplace structural characteristics of heating surface are different, so the heat load of heating surface is uneven, film wall temperature distribution is more complex. Torch on membrane wall heat flux changes of temperature have been studied literature bJ. Studies have shown that non-uniform membrane wall in the temperature range,[link widoczny dla zalogowanych], especially the working conditions of the worst fin, fins or so, before and after the temperature difference between up and down there, especially the larger temperature difference between fin length, ~-like temperature of 40 ~ C to L, heat the danger point is outside the rib side wall, water wall section which is the highest degree distribution Xie, therefore, should be appropriate in the structural arrangement reduces the length of fin, narrow tube that is the appropriate pitch. Of course, the membrane wall tube can not be arranged too close,[link widoczny dla zalogowanych], because this is j to maintain a high temperature have an adverse impact in the design of membrane lining the fireplace, set pins allow the wall increases heat absorption, increasing the pin density can Gao was the ear to increase heat absorption. However, the fluid dynamic characteristics of the Department to have an impact, while the temperature is too high may cause the metal to reduce thermal shock resistance of lining. So. To be selected from one of the best pin density. In addition, the water wall is planted in the design diameter membrane lining the fireplace should be of concern to factors. Operation and practice, the smaller the furnace water wall tube diameter has a large thermal sensitivity of J, however. Diameter as small as possible is not the water wall in the design, the Wall should not be too small diameter usually 051 ~ 76tlllll,[link widoczny dla zalogowanych], wall thickness 3.5 ~ 6.0t Shan 1 per pipe joints References: [1J He feign righteous CFB material on application of wear mechanism of wear [/ 3]. Kunga: Kunming University of Science 1999 [2j [added] Basu P, Fraser s. CFB Boiler Design and Operation [Mj CEN Kefa. Ming-Jiang Ni, Luo Zhongyang. Such as translation. Beijing: Science Press,] 999_3 』cars can Fu, Chu Jian, pool for, and, sobbing Bi cicadas. Boiler and heat exchanger quail staff slagging, corrosion prevention of loss and blind principle and calculation 【M], Beijing: Science Press, 1994 [4 Tang rainbow. Yang Rui Lv Lu Zhongqi other 3 ∞ MW boiler unit to run Wall Safe disgrace peak analysis [JJ Tsinghua University (Science Edition from cooked) ,1997,2:16-18. (Drainage source editor) (Continued from 383) to shame (sweet din (1) According to the change machine on the 10th Thermal Power Plant of Jilin vacuum test, we can see each of the aircraft changes the vacuum conditions in the 2ooMW 1kPa, power Tsui change 1203.7kW; in 140Mw Every change in the vacuum conditions 1kPa, power changes 14935kW. 140MW limit vacuum condition for a value of about 3.241kPa Sincere change on power under the correction curve Richard, 200MW ultimate vacuum conditions of about 45kPa (2) machine Vacuum general curve shown in Figure 3 changes; aircraft change on the power vacuum correction curve shown in Figure 4 (3) obtained by experiment to change the slow bleed at the nose Angeles with the same type of unit called the reference residue. References: Figure 4 vacuum changes correction curve according to the power line. Richard, exhaust steam flow conditions are: .75 vessels / 535/535418t/h,[link widoczny dla zalogowanych], the unit's ultimate vacuum of about 45kPac Harbin Steam Turbine Plant i9834 conclusions (Drainage Source Editor)
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