Haidian Sewage Pumping Station is located in the beautiful Haichang Haidian Creek, Haikou City sewage treatment project is an important ancillary works, responsible for the transport center area (except Haidian Island, Xinbu Island) all the sewage task. The total project cost is 42,959,200 yuan, covers an area of ​​about 4500m2, designed to enhance the sewage capacity of 6.0m3 / s. Since it was put into operation in October 1999, it has delivered an average of 20 × 104m3 / d of sewage. 1 process and problems 1.1 between the grille? Grille between the plane size of 8.0m × 18.0m, the ground below the depth of 9.3m, the operating platform is located 4.9m below the ground, is a semi-underground grid. There are three sets of gutters, using underground parallel straight reinforced concrete channels, length of 8.0m, width of 3.0m. The main equipment and equipment in Table 1. Arranged between the grille 6 ultrasonic level meter, used to display the gate before and after the water level. Grille between the water flow is good, the equipment selection economical and reasonable, advanced technology. However, some problems have been found in the actual operation: ①There is a big gap between the elevation of water level at the inlet culvert (the water level at the inlet of the floodgate) and the operating platform, resulting in serious potential safety hazards in production. For example, a sudden power outage Or floodgate leakage damage and other circumstances, the rapid flow of sewage will be in a very short period of time will be flooded the entire platform, resulting in irreparable loss; ② grille too wide (60mm) so that some water in the soft material (such as Cloth strips, hemp rope, etc.) can easily be washed across the grid into the pump pit and wound on the impeller running at high speed, affecting the normal operation of the submersible pump; grid motor rake together with rake, it is easy to damp corrosion . Table 1 Main equipment and equipment between grille Equipment Name Number of operating parameters (Taiwan) Place Grasping rake grille pitch 60mm, lifting capacity of 300kg 3 Germany screw conveyor (A, B) Power: 2.2kW, speed: 1430r / min, gridding conveying capacity of 6m3 / h, diameter of 280mm, length of 13000mm 2 Germany grating slag compactor power: 5.5kW, speed: 1385r / min, compaction capacity of 6m3 / h, diameter of 400mm, 3000mm 1 Germany gate (electric) width of 2.0m, height of 1.5m 6 Germany 1.2 pump between the plane size of the pump 8.8m × 18.0m, pump room depth of 10.3m, the operating platform below the ground 4.9m Location, semi-submersible pump room. Set for the underground pool of reinforced concrete rectangular pool, the effective volume of 310m3. Equipped with 5 German ABS submersible pumps (4 for 1), the technical parameters are: Q = 1.2m3 / s, P = 160kW, H = 100k Pa, η = 91.5% With check valve and electric butterfly valve. In the pump pit equipped with an ultrasonic level gauge and two tuning fork probe to automatically control the pump to open and stop and dry run protection. The main features are: ①hydraulic conditions are good, compact layout, short and straight outlet pipe, reducing the head loss, to achieve energy-saving purposes; ② the German production of ABS submersible pumps, although the higher prices, but the work efficiency, life expectancy Long, energy saving, simple installation, less investment in civil engineering; ③ submersible pump itself with a set of advanced self-protection device, the working water level below the minimum water level, motor temperature rise, bearing temperature and humidity, current, voltage exceeds normal, Can automatically stop the pump; ④ pump outlet with a reliable check valve, without closing the outlet valve and then start the pump group; spare equipment usually can be set to open the outlet valve, ready to start standby at any time in the instantaneous switch Not to bring fluctuations to the production, to avoid sudden failure due to equipment caused by production operations or even an accident occurred. However, some problems have also been found in the process management: ①The energy consumption is increased due to the higher designed total water level difference (10 m), and the total designed water level difference in Japan is only about 2.0 m. (2) The current of the side- Higher than the middle of the water pump phenomenon (about 10% ~ 20% higher), and from time to time there will be "surge" and "cavitation" phenomenon, indicating the instability of the pumping station diffusion of water, swirling phenomenon exists. 1.3 Outlets using a high open tank (semi-underground reinforced concrete channels), the plane size of 18.0m × 2.5m, the depth below the ground is 4.9m, the ground above the height of 1.3m, the highest elevation of the water level of 5.0 m; There are two outlets in the outlet channel. One outlet delivers the sewage to the WWTP at a flow rate of 4m3 / s and the other discharges the wastewater to a rate of 2m3 / s (6m3 / s at the accident) in the heavy rainy season Haidian Xi; with 3 electric gate conversion control, the middle gate from the shunt isolation. In the operation and management found that due to the use of the lateral outlet water tank caused by the side of the exit pump outlet resistance, high operating current, and sometimes even the phenomenon of gate. 1.4 Ventilation Noise Prevention System Due to the fact that Haidian Sewage Pumping Station is located in the residential area, it has high requirements for the prevention of noise and odorous gases. Therefore, it adopts enclosed structure and equipped with 4 axial blowers. The tuyres are located in the grille channels and rooms Within the air supply volume of 2 × 104m3 / h, ventilation frequency of 5 times / h, exhaust emissions at high altitude; pump station equipment are used less noise imported from Germany, only the fan noise when operating, it will be It is housed in a cage with additional damping facilities. 1.5 automatic control system Pumping station control room control system by the German ABB company Sattcon35, Sattcon05 programmable logic controller (PLC) and MCC and other self-control equipment, in addition to automatic control system operation, but also with the condition parameters acquisition and processing, Modify analog setpoints, alarms and fault reset functions. 2 Operation Management 2.1 Energy Saving Operation Pumps are the most energy-intensive equipment in a large sewage pumping station. Haidian sewage pumping station submersible pump speed control function does not have the following conditions, the following energy-saving methods: ①production at any time to adjust the three inlet gate, in order to maximize the amount of water and water close, so that each submersible pump operation Are in the high-efficiency area, while saving energy but also extend the life of the pump; ② try to make the submersible pump in the allowable high water level (80% to 90% of the water level) to run, thus reducing the pump pit water level and the water level Of the difference, an increase of the pump out of water, energy-saving at the same time also eliminates the impact of cavitation; ③ found when the submersible pump mouth ring rupture or wear caused by leakage gap exceeds the specified value (mouth ring radius clearance should be the impeller mouth ring 2.5% of the outer diameter 3.5%), should be promptly replaced or repaired, which is very effective to improve pump efficiency. 2.2 Process Improvement ①installed in the culvert water level ultrasonic level meter and connected with the PLC, so that we can monitor the water around the culvert in the water level and inform the upstream pump station open, stop the pump to avoid the downstream pumping station also Did not open the pump to vacate the pipe, the pump station on the upper reaches of the driving overhead and ran the phenomenon of running away. ② improve the grille, the pitch from the original 60mm into 30mm, effectively blocking the soft water in the sewage (such as cloth, hemp rope, etc.), thus ensuring the normal operation of the submersible pump. The specific approach is: According to the grille assembly drawings will be the same material processed into the size of the wire rod, and then welded up. Anticorrosion measures: the use of atomic ash on the surface, after curing lacquer spray, the effect is good. (3) In view of the problem that the flow pattern of water inflow is not good, unsteady and swirling easily, the method of equal opening of three inlet gates in the production is adopted to make the kinetic energy of the three inflows offset each other. The swirling flow is well eliminated, and at the same time, the working current difference of each pump is reduced, thereby avoiding the occurrence of "surge" phenomenon. 3 Conclusion Haidian sewage pumping stations of various structures selection is reasonable, advanced, technical parameters meet the standards, well-equipped equipment. In the production management, the operation optimization and process improvement are carried out with the purpose of saving energy and reducing consumption, the effect is remarkable and the operation condition is good and stable.