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In this paper, a kind of method in natural gas energy measurement is improved based on traditional flow automatic metering system of natural gas, which combines with natural gas composition analysis software in order to measure natural gas energy. Then, it introduces the uncertainty and the traceability of natural gas.
Second order backscatter error is one of the main error sources in high precision interferometric fiber optic gyro(I-FOG). In this paper, the error model of second order backscatter is established. Then, a method of three carrier modulation has been proposed to decrease second order backscatter error. Compared with no-carrier modulation, the error caused by second order backscatter can be significantly...
This paper proposes to develop an angle measurement system of the orientation sensor based on accelerometers and fluxgate magnetometers. By analyzing temperature error and fix error which affect the orientation accuracy, a new error correcting model has been put forward. Testing results show that the MWD orientation sensor system utilizing the suggested compensation model is more accurate in directional...
In order to investigate the characteristics of the reaction between SO2 in flue gas and Na2SO3, the effective ingredient in absorption solution during the process of sodium alkali FGD. The volumetric overall mass transfer coefficient (KGa) for SO2 removal from flue gas into aqueous solution of Na2SO3 was studied in a packing column with PP rosette packing. The KGa value was evaluated over ranges of...
In order to study the effect of rosette packing in sodium alkali FGD process, a pilot test in a packed tower of diameter 0.5m was done. Several important factors affecting SO2 desulfurization efficiency were tested individually. These parameters included pH value of absorption solution, liquid-gas ratio (L/G), temperature of inlet flue gas, superficial superficial gas velocity and initial concentration...
The running state monitoring of the power transformer is the effective method to lower its failure rate. Three windings power transformer and site environment as monitoring object, a multi-channels temperature acquisition (TA) system is designed. It adopts blocking design, including temperature acquisition module and temperature data processing module and they communicate through CAN bus. The tests...
It's difficult to measure the flux of supercritical water because of its high temperature and pressure. With a example of supercritical water with a pressure of 25 Mpa in tube (inner diameter = 37 mm), experiments and simulation were taken to study the mass flux measurement by orifice flowmeter. At normal atmosphere, the orifice plate is demarcated by weighing method, and then simulated by Fluent...
At present, China is universally short of professional computer room managers and the modern management of the environment seems especially important, which makes studying and developing a stable, advanced, effective and high performance price ratio environmental monitoring system extremely necessary. Combined with the production practice of hydraulic power plants, this paper proposes a brand new...
The LD-PSD measurement system is widely used in modern geometrical precision measurement, such as displacement, angle, vibration and position error detection. It adopts LD as the light source and PSD to detect the position of laser spot. In this system, such unfavorable factors as background light, dark current of PSD, environmental temperature and electromagnetic noise can reduce the accuracy of...
A kind of transmission line temperature on-line monitoring system based on ZigBee is presented in this paper. The principles, standards and application advantage of ZigBee wireless communications technology are discussed. The design of hardware and software are discussed detailedly. The monitoring system works steadily, its size is small, cost is low, and the power consumption is very low. This system...
High voltage circuit breaker (HVCB) is one of the most important equipments for controlling and operating in power system. In order to increase the reliability and safety of power system, it is necessary to carry on online monitoring and failure diagnosis on HVCB. However there are many difficulties in HVCB failure diagnosis. Based on fuzzy diagnosis theory, a fault diagnosis model of high voltage...
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