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Large rotary air preheater leakage and calculation


℃, import and export of air temperature of 20 + C and 325 ℃, can estimate the temperature difference between hot and cold end to 270 ℃ or so, turning height 1.7m,MBTシューズ 販売店, rotor radius R = 6.5m, then G = 0.006X270X6.5. 40.3mm visible deformation is great, will form a large triangular area if uncontrolled leakage, resulting in the leakage will be very large, while the hot end of the radial deformation of the automatic detection and tracking control is easy to implement. Modern large-scale rotary air preheater generally are equipped with automatic tracking and control of flat plate and the gap between the rotor sealing surface, so that the lowest value of air leakage control. According to the manufacturer's information, 600MW unit at 600,450,300 MW SDS can reduce, respectively 30,24, l6 of leakage. SDS is used to make the total leakage reduction of about 30, but the remaining 70 or so leakage is not the SDS can be eliminated. In addition to good performance of the SDS and to avoid misuse, the good quality of the installation. Ensure that the seal gap design values, especially the value of the cold-side radial seal is very important. In addition, the columns and the axial seal gap to the value can not be ignored. They are the rotary air preheater in the 1994 East China Electric Power No. 11 best operating conditions of important factors such as Beilun Port No. 1 furnace air preheater and put into operation in poor condition after the operation, the measured air leakage rate of 2O . After each seal gap after the SDS system and adjust the hot and cold state. Air leakage rate dropped to 7.5 or so. Nevertheless, the leakage rate is still higher than the design of many due to pressure arising from the direct leakage of town is calculated by _____________________________ ---- Wn =: d · A ·,, 19.6g · P · but where a- - flow coefficient; A normal operation of the gap area (m); but the pressure difference between the two fluids LPa); g ... acceleration of gravity (m / s ,vibram five fingers outlet。);-- air density (kg / m) wr - direct air leakage volume (kg / h). 2 to reduce the economic benefits of air leakage to reduce leakage to send the wind to reduce the electrical energy consumption; followed by the air outlet temperature increases, fuel costs reduced; while the flue gas oxygen content decreased, after the air preheater dust and other equipment hazards was reduced. 2.1 to reduce heat loss to save fuel costs. : - Villa two !!::-:'。 1000q,Beats By Dre Headphones, where w - air leakage rate (kg / h); Tg an air preheater exit gas temperature (℃); Ta an ambient temperature (℃): C a specific heat of air (kJ / kg · ℃) ; C - fuel prices (yuan / t): C eleven years boiler running time (h); q eleven fuels heat (kJ / kg); P cost savings of the year (million) 2. z electricity savings reduce leakage G =-l one hundred research j. 'Where Q, P, - were loaded SDS bad process before or when the air flow (m. / Rain); fan exit Ju force (Pa); corresponding to Q, P conditions of the fan efficiency (); Q' , P ,1 - were installed after the SDS or the best run of wind (m. / rain); fan outlet pressure (Pa); corresponding to Q, P conditions of the fan efficiency (); c a price ( Yuan / kWh); c year running time (h); G cost savings of the year (yuan / year). After the economic benefits of 23 SDS loading Beilun port 2 Furnace air leakage rate of 4.6, the exhaust gas temperature of 131. ℃, the total air volume is 2336t / h. According to the aforementioned loading the SDS can reduce the amount of air leakage 3O,Salvatore Ferragamo outlet, installed before the air leakage rate of 6.6 SDS. That is installed after the air leakage rate decreased by 2 SDS, reducing the leakage is about 47t / h, assuming annual operating 7000h, coal price of 250 yuan / t, the fuel savings: 438,300 yuan / year based on the measured total air flow to reduce 2, the first and second combined wind turbine and l is about reducing the electric power 200kW, just 1.4 million fans in saving kWh. 0.30 yuan / kWh for each year festival electricity 420,000 yuan. Through the above analysis and calculation shows that to reduce the rotary air preheater leakage, should be the normal operation of the SDS system,Beats By Dre Studio, while ensuring that the axial seal, radial seal and cold-side column to seal the gap with the design requirements; should regularly carry out air leakage rate determination and found that leakage should be timely adjusted. (Received 19907-11) Next Issue turbine voltage control system modification and commissioning 125MW unit boiler drum water level control system analysis of turbine governor coke transformation of rural power saving of a number of issues try. 600MW steam turbine operating characteristics of high-pressure heater
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