Liquid level measuring hole over the technical transformation of case

Abstract: the liquid level measuring hole over the technical transformation of case information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Based on huaneng of out power measuring steam drum water level of boiler no. 1 more companies hole on the successful experience of technical reformation, analyses the principle of liquid level measurement and improve the measuring accuracy of the method. Transformation without hole in the steam drum wall, can make the water level gauge measuring mutual interference, reduced. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the drum water level measuring hole over the technical transformation of case article details. Based on huaneng of out power measuring steam drum water level of boiler no. 1 more companies hole on the successful experience of technical reformation, analyses the principle of liquid level measurement and improve the measuring accuracy of the method. Transformation without hole in the steam drum wall, can make the water level gauge measuring mutual interference, reduced the measurement deviation, improve the reliability of the liquid level control protection. One, the steam drum water level gauge configuration of huaneng out unit 1 boiler of HG - power generation company 1025/18. 2 - YM11 subcritical, natural circulation drum boiler, steam drum design 4 para sampling, a total of six sets of water level measuring device ( FIG. 1) 。 Drum a, b side 1 set of each configuration on the double color water level gauge, water level by television monitoring device ( 电视) Sent to the monitor of e/c rm. B side configuration 1 set of independent of the DCS of power supply electric contact water level gauge, the signal is sent to the ecr monitor and alarm. All 3 sets of the water level of differential pressure transmitter's output ( 4 ~ 20) MA signal to DCS, after three take a logical judgment for drum water level monitoring and automatic adjustment control. 3 sets of water differential pressure transmitter signal after three choose two high and low logic judgment. 3 sets of water differential pressure transmitter signal after three choose two high and low logic judgment. As a condition of steam drum water level MFT boiler trip protection. The original design, b side on the double color level meter and electric contact share a pair of measuring hole water level gauge. Second, the existing problems from figure 1 configuration, the six sets of all normal water level gauge, the can completely meet the requirements of operation and protection, but when the one set of gauge failure, especially the drum b side have 1 set of gauge failure, will affect the reliability of the water level measurement accuracy of protection control. Drum b side on the double color, for example, water level gauge tube occurs, due to the double color level meter and electric contact water level gauge sharing two measurement sampling hole and a door, isolation of double color of water level gauge at the same time must isolate the electric contact water level gauge, the steam drum water level gauge with only 4 sets of running. As another example, the drum side 1 b differential pressure transmitter leakage after must isolate a door and the second gate, the drum 2 sets of differential pressure transmitter b side must run out at the same time, only a side of one differential pressure transmitter shall be run out at the same time, only a side of one differential pressure transmitter in water protection and adjusting control, the safe operation of the crisis group. Steam drum water level gauge of this configuration, if meet the requirements, in terms of quantity and measure the type of the hole but the test is not independence and have influence on each other, in violation of the literature of every water level measuring device should have independent sampling hole, parallel holes shall not be in the same sampling multiple water level measuring device, so as not to affect each other, the reliability of the lower water level measurement requirements. Huaneng of out power generation company since October 2000 and put into production, due to an imbalance of boiler steel sinks, with the location of the center line of the drum, the level of the drum is a slope, so should be to determine the center line of the steam drum and reference water column height, so that in DCS logic algorithm to determine the modification, improve the accuracy of the measurement. Third, the transformation of the feasibility analysis and modelling of boiler steam drum is a large super thick, high pressure vessel in its hole strength calculation must be accurate, strict process, construction technology and a slight negligence, local heat treatment will leave a potential safety hazard. In addition, increases the hole quantity restricted by steam drum pressure intensity. Through comparison research, the proposed qinhuangdao huadian power measurement and control equipment in the production of steam drum water level more side hole over technology. The technology is the use of steam drum the original larger measurement sampling hole to take over the channel ( d51mm× 10毫米) , intubation to drum internal sampling, have increased over independent measurement sampling hole, bore the additional measurement sampling with the original sample has a certain distance, and with a steady flow sampler. In this way, the steam drum wall, without the hole needs to be added new measurement sampling hole. Measuring hole over the new measurement on the hole can satisfy the measurement requirement of sampling, sampling and does not affect the original water level measuring device requirements. Iv. 4. Differential pressure transmitter sampling transform (1 1) Demolition of the original liquid level measuring balance container and the related sampling pipe valve, to smooth the sampling tube incision after resection, make it meet the requirements of metal welding. （ 2) In the original measurement sampling hole ( d51mm× 10毫米) Inside, insert d28mm & times; 4 mm of 20 g steel pipe, steel tube insertion than the original measurement sampling hole at least 10 cm long, in order to avoid mutual influence. After sampling tube which leads to the steam drum wall with variable diameter and high pressure cut-off valve, respectively with two balance container welding, form independent sampling line. （ 3) Steam side balance container above the steam side of sampling hole, and has a certain slope, to meet the requirements of the installation technology. （ 4) After balance container positive pressure pipe from the side, level 1 m or so. （ 5) Sampling water side tube level raises, no upward inclined section.

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