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Industry Information
Flowmeter selection under production requirements
2011-9-6 17:08:35

      生产 要求, 仪表产品供应的实际情况出发,综合地考虑测量的安全、准确和经济性,并根据被测流体的性质 及流动情况确定流量取样装置的方式和测量仪表的型式和规格 ,这样就产生了 流量计 的选型。 Under the daily market conditions, according to the production requirements, based on the actual situation of the supply of instrument products, comprehensively consider the safety, accuracy and economy of the measurement, and determine the method of the flow sampling device according to the nature and flow of the measured fluid. And the type and specification of the measuring instrument , which led to the selection of the flowmeter .
:一 是测量方式 可靠, 就是 取样装置在运行中不会发生机械强度或 电气回路 故障 从而产生 事故;二是测量仪表 在正常生产 的情况下还是有 故障情况下都不 影响生产系统的安全 Flow measurement is safe and reliable : first, the measurement method is reliable, that is, the sampling device will not cause mechanical strength or electrical circuit failures during the operation to cause an accident; the second is that the measuring instrument is faulty under normal production conditions Under no circumstances will the safety of the production system be affected . 如,对常温常压 情况下的 流量测量,一般 选购者 先选用悬臂梁式双重喇叭管或 插入式流量计等非标准测速装置,以及结构强度低的 靶式 流量计 涡轮流量计 等。 For example , for flow measurement at normal temperature and pressure , general buyers first choose non-standard speed measurement devices such as cantilever beam double horn tubes or plug-in flow meters, and target type flow meters and turbine flow meters with low structural strength . Wait. 燃油电厂和有可燃性气体的场合,应 选用 防爆型 仪表 However, for oil-fired power plants and flammable gas, explosion-proof instruments should be selected .
  
保证仪表安全运行 还要 力求提高仪表的准确性和节能性。 In addition to ensuring the safe operation of the instrument , we must also strive to improve the accuracy and energy efficiency of the instrument. 不仅要选用满足准确度要求的显示仪表,而且 要根据被测介质的特点选择合理的测量方式。 Therefore, in the selection of the instrument, not only must choose a display instrument that meets the accuracy requirements, but also choose a reasonable measurement method according to the characteristics of the measured medium. 发电厂主 要是 蒸汽流量测量, 因为 其对电厂安全和经济性至关重要, 所以一 般都采用成熟的标准节流装量配差压流量计, 然而, 化学水处理的污水和燃油分别属 脏污流和低雷诺数粘性流, 因此 都不适 合使用 标准节流件。 For example , steam flow measurement in power plants is mainly used for power plant safety and economy, so mature standard throttling capacity and differential pressure flow meters are generally used. However, sewage and fuel oil for chemical water treatment are For dirty and low Reynolds number viscous flows, standard throttles are not suitable . 脏污流一般选用圆缺孔板等非标准节流件配差压 流量 超声流量计 ,而 对于 粘性流可 分别采用容积式 流量计和 靶式流量计 等。 For dirty flow, non-standard orifices such as round holes are usually used with differential pressure flow meters or ultrasonic flow meters . For viscous flows , positive displacement flow meters and target flow meters can be used . 水轮机 人口水量、凝汽器循环水量 及回热机组的回热蒸汽等都是管径 400mm以上的流量测量参数, 因此 加工创造困难和压损大,一般 都不选用标准节流装置。 Because the water volume of the turbine , the circulating water of the condenser and the regenerative steam of the regenerative unit are all flow measurement parameters with a pipe diameter of 400mm or more, the processing is difficult to create and the pressure loss is large. Generally, the standard throttling is not used. Device. 性以 及测量准确度 要求, 可以 采用插入式流量计 超声波流量计 测速元件配差压计或 采用标记法、模拟法等 不能 能损方式测流量 According to the characteristics of the measured medium and the requirements of measurement accuracy , you can use the plug-in flowmeter , ultrasonic flowmeter , speed measurement element with differential pressure gauge, or use the mark method, simulation method and other non- destructive methods to measure the flow rate .