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First, the question raised
South Oil Depot of Daqing Oilfield mainly receives oil from the two major oil production plants, Oil Production Plant No. 1 and No. 2 Oil Production Plant, with a total reserve of 50 × 104m 3 and 5 oil pump units. The main technical parameters of the oil pump unit are shown in Table 1.
Since the oil pump and the oil characteristics of the pipeline do not match (the pump selection process, it is impossible to select the exact match with the characteristic line transfer pump), different conditions of actual operation, by adjusting the feed pump for an outlet valve to Adjust the flow, according to statistics 5 oil pump in a single pump, double pump, three pumps in parallel operation, three different operating conditions, the maximum opening of the oil pump valve outlet does not exceed 10% (more than 10% Pump motor exceeds the rated current and cause the motor overload operation). Resulting in the pump valve outlet before and after the existence of a larger pump tube pressure difference, pump outlet valve throttling loss of a lot of energy, the pump made a lot of useless, shortening the maintenance period and service life of the pump unit, different Operating conditions under the pump outlet valve before and after the pump pressure differential statistics as shown in Table 2.
Note: The data in the above table is based on the statistics of actual operating conditions of South Oil depot in 2002, the data in the table are average.
As can be seen from Table 2, in the single-pump, double-pump parallel, three-pump parallel operation modes, the pump outlet valve has an average of 1.2Mpa, 0.7Mpa and 0.4Mpa throttling losses. In the pump outlet valve before and after the three conditions (single pump, double pump in parallel, three pumps in parallel) as a result of the pump outlet throttle throttling loss arising from:
N loss i = 0.278P loss iQi
Where: N loss i: under different conditions of the valve throttling loss of power, KW
P loss i: under different conditions of the valve throttling loss pressure, Mpa
Qi: single pump displacement under different conditions, m 3 / h
N loss 1 = 0.278 × 1.2 × 750 = 250KW 250KW / 630KW = 39.7%
N loss 2 = 0.278 × 0.7 × 700 = 136KW 36KW / 630KW × 100% = 21.6%
N loss 3 = 0.278 × 0.4 × 640 = 71KW 71KW / 630KW × 100% = 11.3%
As can be seen from the above calculation, under the three conditions of single pump, double pump in parallel and three pumps in parallel, the throttling loss of the outlet valve of the oil pump accounts for 39.7%, 21.6% and 11.3% of the rated power.
Visible, energy waste is very alarming. Therefore, it is necessary to apply the variable frequency speed regulation technology on the pump unit to achieve the operating conditions based on the same bath, to meet the operating conditions through variable frequency operation, the pump outlet valve fully open, to avoid throttling loss of the pump outlet valve .
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