1. Introduction Daqing Petroleum Administration water supply company annual electricity consumption accounts for about 30% of the total cost of water supply, of which the transmission and distribution of electricity accounts for about 70% of the total electricity bill, so how to adjust the pump Daily operation, so that water and electricity distribution tons of water and electricity maintained at a more economical and reasonable range, is the focus of energy conservation. We have always actively explored, carefully studied and took effective measures to solve this problem.

2, the question raised
Company Longhu bubble water plant located in the north bank of the Dragon and Tiger, water intake capacity of 500,000 cubic meters / day. The original design, taking into account the long-term planning and the most adverse water, water level, the choice of two units pump, one for the motor 1400KW / 10KV, take the water pump 900HR (H62 meters, Q6360 cubic meters / hour), the other For the motor 900KW / 10KW, take the water pump 700HR (H62 meters, Q3900 cubic meters / hour). Water pumping station of the two pumping stations - in the first and second phase of the project design water supply 500,000 cubic meters / day. Due to limited production in the oilfield, the water consumption of the external network is declining year by year. At present, the actual water supply of the waterworks is only 250,000-300,000 cubic meters per day, and the total flow Q of the pump is only 104,000-12500 cubic meters per hour. 18-20 meters, while the nameplate pump lift 62 meters, to pump down to the same resistance and pipe network, the pump will be overloaded operation. Therefore, the water plant can only rely on adjusting the outlet gate to control the pump pressure, so that the pump can run in high-efficiency area. This operation not only increases the gate head loss, wasting a lot of power, and if the gate throttle adjustment is not properly, the pump is very easy to deviate from the high efficiency section or overload operation, resulting in increased failure rate of the pump, shortening the use of the unit Life expectancy, the last two years the pump has been more than 10 times the cumulative maintenance, maintenance costs more than 100 million. In the water diversion plant is a large company, whether it can ensure that the water plays an important role in oilfields, therefore, Longhu bubble water pumping plant technical transformation is imperative.

3, frequency conversion transformation program of the initial calculation and demonstration Under normal circumstances, the pump is rated working conditions, according to the best working conditions design and operation. A typical working curve for the pump is shown in Figure 1, where AB is the pump performance curve that matches the nominal system pressure curve, OB, at which point the nominal flow rate at rated pressure is obtained, at which point the pump has the highest efficiency, Close the valve to control the flow. When the flow decreases, the pumps work at points P, Q, R and S, respectively. At this time, the pump needs to work under very high pressure difference. Therefore, the output of the pump is much more than the actual system needs Excess energy is manifested as heat loss on the valve and taken away by the fluid. Divide the output energy of the pump by the efficiency of the pump to find the total input energy to the pump. Adjust the pump outlet valve opening to reduce the flow, the energy loss is quite large.

The use of frequency converter speed, motor-driven pump variable speed operation, the pump characteristic curve and the system at any traffic need to match the flow and the motor speed is proportional to the resulting pressure differential is proportional to the square of the speed of rotation, as shown 2, there are countless pump characteristic curves of AB-CD available after stepless frequency conversion and speed regulation. Any intersection point between the pipeline characteristic curve and the shadow zone formed by ABDC can be used as the working point to adapt to the change of external network water volume. Smaller lift to P, Q, R, S corresponding to the flow, but only a small loss of energy, the energy-saving effect is considerable.

For the same blade pump has the following rules:
Q1 / Q2 = n1 / n2 H1 / H2 = (n1 / n2) 2 N1 / N2 = (n1 / n2) 3
1 #, 3 # and 6 # pumps of Longhuuba Waterworks are imported large pumps with motor speeds of 748r / m, 745r / m and 750r / m, respectively.
If 3 # pump speed to 500 r / m, then the flow, lift and power parameters are as follows:
Q original / Q change = n original / n change = 748/500 = 1.496
Q change = 4251.3 m3 / hr H prot / H change = (n prime / n change) 2 = 1.496 2
H change = 28.59 mN original / N change = (n original / n change) 3 = 1.496 3
N variable = 412.2 kilowatts If the speed to 550r / m, then Q = 4663 cubic meters / hour, H = 34 meters, N = 547 kilowatts, speed pump parameters are basically suitable for the current conditions. Of course, the above calculation is based on the assumption that the system's pipeline characteristic curve unchanged under the circumstances, the installation of variable frequency speed control equipment, the pump outlet valve can be fully opened, the system piping characteristics will shift outwards, then the speed After the pump operating parameters are more likely to meet the requirements of the actual working conditions, therefore, can determine this program is desirable.
4, frequency control program of energy-saving estimates
Pump energy consumption is calculated as: P = (K × H × Q) / η K: for the margin coefficient η: Efficiency Assuming the actual pump pressure from the current 5.8 kg speed down to 2.5 kg, and flow unchanged, Then P25 / P58 = 25/58 = 43%, that is, the power consumption is theoretically reduced by 1-43% = 57%. Electricity costs 0.41 yuan / kWh, the motor efficiency of 0.95, running 330 days / year, then the original annual electricity cost (1400KW × 24 × 330 × 0.41) /0.95=478 million.

After the frequency control to 2.5 kg, the annual electricity cost is: 478 × 43% = 205.54 million, annual electricity savings of 478-205.54 = 2725000 yuan. Preliminary energy saving effect is quite impressive.

5, the program is confirmed
Taking into account the actual conditions in the lead a pump, after careful calculation, demonstration, multi-faceted inspection, comparison of many manufacturers, we decided to install Beijing Li? Light 鞲 飨 plutonium reading 苤 Vice 曷 闼 霉 mildew ひ find 螅 nibbling more fierce 撸 chest chest 涠 BR BR BR BR
The specific scheme is to close the liaison valve between Phase I and Phase II, and the II phase pipe network operates independently. The inverter adopts 6 # pumps in a one-by-one way to drag it. When the 6 # pump fails, it can be put into operation with power frequency. Power frequency / frequency switching by bypass cabinet manually switch. Moreover, the frequency and frequency switching electrical interlocking and PLC logic interlock, to ensure the safe operation of the unit. Constant pressure control, closed-loop operation, phase II pipe network pressure of 0.1MPa; automatic control valve linkage, with cooling water flow detection and protection.

6, after the transformation, 6 # pump high voltage frequency control device trial operation
January 6, 2002, Beijing Lee said? 际 际 际 际 际 际 挠 挠 挠 挠 挠 挠 挠 泄 # shed # # Pump frequency control device was commissioned, the trial operation as follows:
Before commissioning, 3 # and 7 # pumps operate in parallel with the following operating parameters:





In order to ensure the stable operation of the water diversion plant during the trial period, we shall notify the substation and the water diversion plant in preparation for trial operation in advance through dispatch. Shut down 7 # pump first, shut off the connecting pipe between the 3 # pump and 6 # pump, adjust the operation of 3 # pump, and the first stage outlet valve opening remains unchanged at 12%. Set the inverter frequency of 6 # pump to 37 Hz and turn on 6 # pump. After the operation is stable, the second-stage outlet valve will open to 70% and observe the frequencies of 35 Hz, 33 Hz, 30 Hz, 28 Hz Pump unit operating status:





After commissioning, we set the frequency to 30 hertz open-loop operation, and arrange the water plant on duty staff to make a separate 6 # pump operation records. Through a few days of operation, the frequency changer movement is stable, the function is complete, the operation is simple, completely satisfies the actual working condition request, has achieved the anticipated hypothesis result.

7, after the transformation of the energy-saving test
Energy-saving effect of the final instrument to use the test, the most direct and reliable method is to use the power meter to measure the energy conversion before and after the transformation to be compared.

The original 3 #, 6 # pump frequency operation, take August 1, 2001 -20 day operation record calculation:
Total electricity consumption: 1,214,700 kwh;
Total water supply: 5,887,400 cubic meters;
Total pumping unit consumption: 0.2064 kwh / m3;
Take July 3, 2001 - 19, 3 #, 6 # pump running frequency calculation of operating records:
Total electricity consumption: 667,500 kilowatt hours;
Total water supply: 3115200 cubic meters;
Total pumping unit consumption: 0.2143 kWh / m3;
32 days 3 #, 6 # pump operating frequency pumping station total unit consumption is:
(0.2064 + 0.2143) /2=0.21 kWh / m3.

Now 3 # pump frequency operation, 6 # pump frequency operation (30HZ), the exchange valve closed, the two pumps run alone. Based on the records of 19:00 - 14 January at 7:00 on January 9, 2002, the results are as follows:

Total electricity consumption: 154,200 kwh;
Total water supply: 1064700 cubic meters;
Total pumping unit consumption: 0.14 kWh / m3;
The original 6 # pump frequency operation, the unit consumption of 0.24 kWh / cubic meter; frequency conversion operation is only 0.06 kWh / cubic meter.
From 19:00 on January 9, 2002 - to 4.5 days at 7:00 on the 14th, the average daily water volume is 1064700 / 4.5 = 236600 cubic meters.
Annual saving: 0.07 * 23.66 * 365 = 604 million watt hours, together RMB: 2,878,800 yuan.

8, frequency conversion transformation, waterworks process improvement
1) Beijing Lee said? 9? Old ?? mother? Gong Gan lamp è°¥? Ignorant of the Song Calvary throwing mirror? 7-200 series PLC, in the field to achieve external logic control, is very convenient. For example: the linkage function of the valve makes the duty staff, no need to operate the valve any more when the pump is on or off; the workload and misoperation are reduced; and the cooling water flow protection function ensures the safe and stable operation of the pump motor.

2) 6 # pump frequency conversion transformation, the motor speed, current, the pump outlet pressure are significantly decreased, the motor pump significantly improved the operating conditions, not only directly saving power consumption, and, due to the soft-start function of the inverter to reduce The impact on the motor and power grid, extending the service life of equipment, reducing equipment maintenance costs.

3) The frequency converter uses pressure closed-loop control, to ensure pipe network pressure 0.1MPa. As the frequency converter smoothing, high control accuracy, so the pressure fluctuations in the pipe network is small, can fully meet the requirements of on-site water supply process.

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5) Host computer monitoring functions and remote dial-up monitoring functions for users to achieve centralized monitoring has created the necessary conditions.

9, conclusion
After the practice proved that this Longhuuba water plant water pump frequency conversion is successful, and achieved economic and social benefits are obvious. One is to save a lot of power, reducing the cost of water supply; the second is to increase the system adjustable range and improve the flexibility of the system operation; third is to reduce the pump motor speed, reducing the pump start-up impact and mechanical friction, Vibration, to extend the life of the unit; Fourth, to reduce the pump noise, improve the working environment; Fifth, intelligent linkage function and improve the fault protection function, which improves the work efficiency, but also enhance the system safe and reliable Sex.

Therefore, high-voltage high-power frequency control technology is a benefit the country, has a wide range of applications of high-tech, water pump for the water supply industry or constant pressure water supply system, with great practical significance. This high-voltage high-power frequency control device, will be the future water supply industry, energy saving, transformation of the preferred equipment!

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