11 1 peak speed 11 2 safety factor The safety factor K 1 ranges from 11 1 11 2. When K 1 = 11 1 , the air volume base is 1, and when K 1 = 11 2 , the total air volume is increased by 9%. 11 3 Pneumatic system leakage coefficient The leakage coefficient K 2 of the pneumatic system is 11 1 11 5. Let K 2 take 11 1 and the air volume base is 1, then when K 2 = 11 2, the whole air volume is increased by 9%; K 2 = 11 3 At the time, the total air volume increased by 18%; when K 2 = 11 4, the total air volume increased by 27%; when K 2 = 11 5, the total air volume increased by 36%. 11 4 Repeated braking coefficient interval repeating braking coefficient is 11 5 2 , the target position repeat braking coefficient is 1 2. When the first and second interval braking position reducer is TJK type, the target braking position is TJK1C (TJK2A) Type and the same number of knots (such as 6 knots), TJK is calculated according to the 4th wind pressure, the repeated braking coefficient of the interval braking position is taken as 11 5, and the repeated braking coefficient of the target braking position is taken as 1 when the basic air volume is used. When the repeated braking coefficient of the target braking position is taken at the same time, the total air volume is increased by 37%. When the first and second intermittent braking position reducers are TJK3A type and the target braking position is TJK2A type, and the same number of sections (such as 6+ 6 sections), the repeated braking coefficient of the interval braking position is taken as 11 5, the target braking When the repeated braking coefficient is set to 1 for the basic air volume, the air volume is increased by 51% when the interval and the target braking position are repeated. 2 comparison 1. When the peaking speed is 7km/h, set the safety factor, the leakage coefficient of the pneumatic system, and the used air volume calculated by the minimum value of the repeating braking coefficient of the reducer to be 1, then use the air volume when these coefficients take the maximum value. Added 1 @1 @11 09 @11 36 @11 4= 2 times. 2. When the peaking speed is 6km/h, set the safety factor, the leakage coefficient of the pneumatic system, and the calculated air volume for the minimum value of the repeating braking coefficient of the reducer to be 1, then use the air volume when these coefficients take the maximum value. Added 1 @11 16 @11 09 @11 36 @11 4 = 21 4 times. 3. When the peaking speed is 5km/h, set the safety factor, the leakage coefficient of the pneumatic system, and the used air volume calculated by taking the minimum value of the repeating braking coefficient of the reducer to be 1, then use the air volume when these coefficients take the maximum value. Added 1 @11 4 @11 09 @11 36 @11 4= 21 9 times. Different designers have different wind turbines for the same size of the hump field due to different selection factors. The results will be similar to the next stage of Engineering design, investment, construction and production. Great impact. Therefore, based on the actual use of the situation, comprehensive consideration should be made to determine a reasonable value. 3 conclusions 11 Considering that the minimum values ​​of the coefficients are mostly greater than 1, after calculation, when the coefficients in the formula select the minimum value, the actual air volume has increased by 22%. 21 The calculated air volume is the total air volume of the hump. Therefore, when selecting the air exhaust volume of the air compressor, the air volume of a single air compressor should be less than the total air volume. 31 For a hump with a large amount of work, if the peak of 24 h is more than 2000, the coefficient can be selected to be larger, and if the number is less than 2000, the coefficient can be smaller. The calculation of the instantaneous air volume of the hump should not be used as the sole basis for engineering design to select the air compressor. The influence of the storage volume needs to be considered when determining the air volume of the air compressor. According to the actual operation and maintenance, the storage volume is preferably slightly larger than the calculation volume. Generally speaking, the volume is larger, and the instantaneous fluctuation of the wind supply system is small, which can make up for the instantaneous air discharge of the air compressor. 51 There is no clear regulation on the relationship between the air volume and the number of air compressors. According to the previous practice, when a single air compressor works to meet the normal air volume, the general chute is equipped with one main engine, one auxiliary machine, and one standby machine. When the hump in the hub area is disintegrated more than 4,000 vehicles every day and night, an air compressor should be added as a backup machine to improve the reliability of the power system equipment. 61 The air volume of a single air compressor is generally better at 10m 3 / min, because in the case of determining the volume of the wind storage, the exhaust air volume is too large, which will cause the air compressor to start and stop frequently; If the amount is too small, it will cause the air compressor to work for too long. At present, the operating units try to reduce the operating expenses of the equipment while safely transporting and new equipment meets the needs of transportation. Reasonable determination of the amount of wind used in the hump field is of concern to the operating takeover unit. Excessively calculated values ​​not only increase unreasonable investment (including equipment costs, increase in power room, increase in power capacity, etc.), but also increase operating expenses after production (increased power consumption, increased expenditure on parts and materials, etc.) Wait). The calculated value is too small to meet the transportation needs, directly affecting the number of humps compiled and reducing the hump efficiency. 4 specific examples 1 14-row hump, with 1 interval braking position (TJK type 5+6) and target braking position (TJK1D type 6+ 6), the peaking speed is 6km/h, and the interval is used as the second part and 4 level. Working wind pressure, the minimum air volume is calculated to be 26m 3 / min, and the maximum air volume is 57m 3 / min. According to the configuration of 3 10m 3 / min air compressors, it should be able to meet the needs; if it is equipped with 3 sets of 20m 3 / min The air compressor has a significantly larger exhaust air volume than the actual air volume. The actual situation is that the air volume is much smaller than the minimum air volume. Therefore, the design should be based on the specifications and combined with the actual situation to make a reasonable calculation, in order to make a realistic design to meet the needs of transportation. Ore Dressing Machine, Feeder ,Mineral Separator,Mining Mill Crushing Equipment,Mobile Crusher Co., Ltd. , http://www.nbgrindingequipment.com
Determination of air volume and air pressure facilities for new deceleration facilities
1 coefficient selection