The equipment of sewage treatment plant is a complex and complete working system, its main components are: electrical, mechanical and automatic control of a variety of individual equipment. The quality of all equipment can ensure the healthy and stable operation of the sewage treatment plant. In the investment of wastewater treatment plant, equipment expenditure accounts for about half of the total proportion. Therefore, it is necessary to ensure the quality of sewage treatment plant equipment. According to statistics, the main cause of the sewage treatment plant can not work stably is equipment failure. Generally due to equipment failure caused by the inability to run is accounted for half of all the problems. This reminds us of the installation and commissioning of the relevant equipment and test run has a very important need. Do a good job is to ensure that the relevant work is to ensure the stable operation of urban sewage plant is the most important.
1 Importance of sewage treatment plant related equipment adaptation
Submersible mixer, blower, grating machine, submersible pumps, scraper suction machine, sludge thickening and dewatering machine, etc. is an important part of the sewage treatment plant equipment. Before entering the field for installation, it must be compared with the relevant instruction manual to ensure that the purchased equipment meets the design requirements. At the same time, in the installation process must strictly follow the relevant construction specifications for scientific installation. The quality of the standard equipment needs to be cleaned first, in accordance with the specifications will be involved in the process of piping, transmission devices and track installation is complete, so that it becomes a complete system. After that, it must be done in accordance with the norms of no-load test. Through the no-load test in time to find problems in time to deal with, until the operating parameters of the equipment to meet the corresponding provisions. Stand-alone no-load test, the equipment system to carry out linkage debugging, can ensure that the organic operation of the whole system, to ensure that the coordination between the individual machine operation. This can technically meet the design requirements.
All of the above equipment debugging is for in-depth inspection of all aspects to ensure that all equipment is free of defects and hidden dangers. This will ensure the stability of the equipment in actual operation, so that you can put into actual production before the final adjustments to ensure that the equipment in the actual operation of the process is more stable, to ensure that the operating conditions of the equipment to meet the needs of the actual production. Usually equipment debugging work has the following processes, first, do a good job of no-load test; second, effective load test, this step can ensure the stability of the equipment operation; the order of experimentation: the first stand-alone experiments, followed by systematic linkage experiments. The first stand-alone test is to prepare for the no-load test and load test. Equipment in the absence of load in the case of the relevant experiments is the no-load test, the test is to check the quality of the relevant equipment installation, the stability and safety of equipment operation. Ensure that the equipment in the load operation of the normal operation. Check the working condition of the equipment in the state of bearing load belongs to the load experiment, the stability and reliability of the equipment. The commissioning of the above equipment must comply with the relevant operating specifications, in the commissioning process to check the smoothness of the equipment operation, to ensure that the sound is uniform and no noise, and at the same time to do a good job of friction serious part of the temperature, water temperature and oil temperature and other technical parameters.
2 Sewage treatment plant electromechanical equipment commissioning program analysis
City sewage treatment plant used in all the equipment in terms of quality, specifications and varieties must be in line with national regulations, in line with the technical requirements of the design documents. The main reference specification is GB50334-2002 "urban sewage plant engineering quality acceptance specification". The following on how to do a good job of sewage treatment plant electromechanical equipment commissioning to elaborate:
2.1 No-load test drive In the grating decontamination machine for the process of no-load test drive, we should first check the longitudinal surface of the grating bar and guide rail lateral surface parallel. The gap between the rake teeth and grating engagement is not more than 0.5mm, to ensure that there is no blocking phenomenon, in addition, the depth of engagement should be greater than 35mm. check the installation is reasonable and error-free, before you can start the equipment for the unloaded load test. Normal state is: the work of the grid piece of normal operation, no jamming and jumping. Also ensure that when the equipment is running, the trash on the fence piece will not fall into the ditch.
The pump unit inspection focuses on the sealing of the installation. Make sure there are no leaks of water or oil. Guide the submersible pump lift the inverted rod connection must be firm, and do a good job of sealing treatment, at the same time, the position between them to keep straight; screw pump pump body, pump jacket to be done in advance of the hydraulic experiment. In order to ensure the stability of the pump, it needs to be fixed with ground bolts. In addition, such as involving the second pouring there is a need to take to ensure that the pouring of the dense; preparation to the pump outlet flange needs to ensure that the installation of the straight; must be used to install the pump power cable firmly, and in order to ensure the safety of the cable and the suction port of the distance to be greater than 350mm.
In the installation of sand and water separator must ensure that it is in line with the relevant design specifications to ensure that the equipment foundation is firm, the elevation of the accurate. And there will be no water seepage at each interface. Check the process to ensure that the sand and water separator power supply and distribution system supporting the integrity of the installation of scientific, after checking before starting the power supply, check the sand and water separator no-load running conditions.
The position and elevation of the installation of the blower must ensure that the rationality, in line with the design specifications. The equipment inlet valve, piping, muffler and other related equipment must be connected confidential. Ensure that the tightness of each connection part, to ensure that there is no loosening. At the same time, each bearing connection and assembly also need to strictly refer to the specification. After the above parts of the test through, you can carry out no-load test. At the same time, the test run must be carried out with reference to the manuals and documents accompanying the equipment. The relevant operation procedure is: turn on the blower, first use the pointing mode, after which it can be formally started. The inspection of the blower during no-load operation is mainly to check its operating condition and related parameters as well as muffler and other devices, and to check the operating effect of the devices anyway. Check the air inlet valve and piping sealing, all the equipment is running normally after the blower will be connected to the network to do later experiments.
To do a good job of the sedimentation tank equipment for the unloaded test, first of all, according to the design documents to check the relevant parameters and shape of the sedimentation tank and the bottom of the degree of flatness. After that, carefully check the accuracy of the installation of the relevant equipment and technical parameters are in line with the relevant design indicators. It should be noted that the scraper of the sedimentation tank should keep a reasonable distance from the bottom of the tank to ensure that the work will not collide with each other, friction, thus hindering the normal operation of the mud scraper. After the test, in line with the design standards, the candlestick to open the mud scraper power supply for test run. In the process of checking the basic situation of machine operation. Its inspection content is mainly: scraper and suction mud machine equipment in the operation of the sensitivity; skimming plate and scraping mud board in the operation process normal or not, to ensure that there is no jamming and sudden jump and other phenomena. Also need to check the operation of the guide wheel of the mud scraper.
2.2 load test of sewage treatment plant mechanical and electrical equipment in the off-site grating pump room load test process, the first water inlet channel and the pump before the pool filled with enough water. After starting the power supply, respectively, to check the grating decontaminator, belt conveyor, the gate, valve opening and closing of the operational status and sensitivity. Then start lifting pump power, for lifting pumps, check valves were checked. Ensure that the equipment is in normal working condition, to ensure that the electromagnetic flow meter, current, voltage and shaft temperature is normal.
The load test of cyclone sand sedimentation tank. Fill the sand sedimentation tank with water according to the standard; turn on the adjustable speed cyclone slurry, and at the same time check the operation of the cyclone slurry; turn on the sand pumping pump and sand-water separator, and check the start-up of the sand pumping pump and the sand-water separator work one by one; check the specific parameters of cyclone sand sedimentation tank to ensure that there is no leakage, and confirm the sealing and sensitivity of the opening and closing of the gates and valves.
The load test of the second sedimentation tank. Fill the pool with water until the aeration is submerged, open the gas supply valve. In this process need to accurately control the amount of aeration, in order to ensure stability, generally open a blower, and pattern the specific circumstances of the adjustment of the relevant amount of gas, when the aeration situation is normal, you can increase the corresponding amount of water injection, at the same time, you can continue to increase the gas supply. In accordance with the requirements to increase the water injection must be reasonable, do a good job of checking to ensure that there is no leakage. Carefully check the work operation of the anaerobic mixer and anoxic mixer that have been turned on. Start the mixed liquid reflux pump and sludge reflux pump, check whether the operating condition of each equipment is good, and at the same time check the sealing and sensitivity of each valve and gate.
The load test of the thickener. Before starting the scraper, need to be in accordance with the requirements of the thickener for water filling. To ensure that the scraper in the thickener to maintain good operation; open the various valves of the sludge discharge system, one by one to check the sealing between the sleeve valve and the various opener, to ensure that the gates, valves open and close the sealing and sensitivity. Load test of chlorination contactor is also an important part of the experiment. To check whether the installation of the chlorination device is scientific and whether it complies with the relevant norms. According to the relevant data for water filling, open the switch, to control the amount of chlorine. Then carefully check the operating condition of each part and the sealing and sensitivity of valves and gates. At the same time, but also do a good job of control systems and alarm systems check.
3 Conclusion
In order to effectively improve the quality of urban sewage plant, it is necessary to install and debug the grating pump room, blower room, grating room, two sedimentation tanks, cyclone sand sedimentation tanks and thickening tanks and other related supporting mechanical and electrical equipment. Ensure the normal operation of the sewage treatment plant, and gradually improve the quality of sewage treatment. Scientific commissioning, test run work is to ensure the stable operation of mechanical equipment, the technical prerequisite for the healthy development of enterprises. There are many other problems that need to be solved in the installation and operation of equipment, which must be faced by the sewage treatment plant. In the actual work process, we must constantly according to the objective situation, at any time to make scientific adjustments in order to truly meet the needs of production.
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