Open channel flow meter scale of sewage flow monitoring data analysis of the technology

Abstract: the sewage flow of open channel flow meter scale information the technical analysis of monitoring data produced by excellent flow meter, flow meter manufacturer to offer you the quotation. As the environmental pollution problem is increasingly serious, to establish environment management system in our country, strengthening the environmental monitoring put forward higher requirements. At present, the domestic focus on polluters are installed the water automatic monitoring system for the real-time data of the wastewater discharge can be uploaded. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the open channel monitoring data of sewage flow meter scale of technical analysis, the article details. As the environmental pollution problem is increasingly serious, to establish environment management system in our country, strengthening the environmental monitoring put forward higher requirements. At present, the domestic focus on polluters are installed the water automatic monitoring system for the real-time data of the wastewater discharge can be uploaded to the municipal, provincial environmental monitoring departments and the competent department of the state environmental protection. In order to ensure the effectiveness of the upload data, the national environmental protection issued the HJ/T355-2007 water pollution sources on-line monitoring system for operation and technical specification for inspection and HJ/T356-2007 'technical specification for water pollution sources on-line monitoring data validity discriminant and other normative documents. These documents to the related water quality monitoring data ( Such as chemical oxygen demand (cod) CODcr, ammonia nitrogen NH3 - N, total p TP, pH value) Etc. , the detailed rules on the pilot project and data requirements, but about how to ensure accuracy of the flow of water monitoring data, but do not required. As the requirement of main pollutant total emission monitoring is put forward, this situation is found and attached. At the end of 2013 the environmental monitoring department has been put forward about the sewage flow measurement technology and methods of the quality supervision and inspection. But from the point of view of professional flow metering, ring surveillance authorities method only to simplify the metrological verification procedures related to the project and restructuring, and there is no in-depth analyse measurement technology, there is no guarantee that the accuracy of the site traffic data. While in this paper, according to the sampling data of field verification of sewage flow in open channel flow meter, made some research and analysis, in order to further implement accurate sewage discharge online monitoring laid a certain foundation. 1 the sewage flow measurement. 1 the principle and composition due to the standardization and the need of video monitoring, outlet of sewage flow in open channel flow automatic monitoring system with weir trough type flowmeter for flow measurement. Weir trough to the principle of open channel flow meter is set in the open channel standard measuring weir trough ( Such as flume and rectangular thin-wall weir bashir's, etc. ) And position measuring water level in accordance with the regulations, through the weir tank discharge and water level of a single value, according to the corresponding flow formula or empirical relations, to measure the water level value conversion into traffic. Flow meter by the standard measuring weir trough and liquid flow conversion instrument ( Secondary instrument) . As shown in figure 1. Figure 1 weir trough type open channel flow meter system diagram according to the statistics, the experiment of sewage flow automatic monitoring system for a total of 338 sets of weir slot open channel flow meter. Among them, the groove bashir's accounts for 68. 2%, rectangular thin-wall weir of 14. Accounted for 17 5%, other weir trough type. 3%, based on the standard tank bashir's open channel flow meter as an example for analysis. 1. 2 standard tank bashir's open channel flow calculation, the mathematical model of standard channel flow Q bashir's press type calculation: ( 1) Type: C for flow coefficient; B for the throat width, m; Ha for the measured liquid level, m. By standard slot open channel flowmeter bashir's basic principle and calculation formula of flow, the flow measurement accuracy directly depends on the accuracy of the flow coefficient C, throat width measurement accuracy and the accurate degree of the measured liquid level. Among them, the accuracy of the measured liquid level assessment and includes three factors: the influence of liquid level measurement accuracy, measuring the level of measurement accuracy of the instrument and zero liquid surface perturbation. 2 the influence factors of the flow measurement accuracy through the above analysis, we can come to the conclusion that sewage online monitoring system based on open channel flow meter, the main factors influencing the accuracy of flow measurement has the following several aspects: 1) Weir trough type, mainly to determine the coefficient of flow measurement accuracy; 2) The accuracy of the measured liquid level, mainly depends on the level of measurement accuracy and measuring the level of measurement accuracy of instrument zero; 3) Level measurement repeatability, is determined by the liquid surface disturbance or smooth, main influence level measurement reading many times the average of the measurement accuracy; 4) Weir tank geometry size, depending on the throat width ( Or other of the weir trough plate, slot size) The accuracy of measuring instruments; 5) Water - flow conversion error, generated by the flow meter of the secondary instrument software. Because of various weir trough flow formula involving multiple parameters of open channel flow meter and flow meter manufacturers in the software system for conversion, various parameters according to the design of different size range, in the form of database functions for storage, due to the restrictions of the storage space is not enough accurate parameters, thus causing the error of the flow meter display value. 2. 1 weir trough type of open channel flow meter in the weir tank when the choice, the main consideration factors such as flow range and design and construction difficulty.
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