Abstract: wireless steam flow acquisition system application in the oil storage enterprise information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Xingzhong sinochem petroleum transport ( Zhoushan) Co. , LTD. , zhongshan and reservoir area in order to ensure production operation, terminal adopts steam heating way to keep the oil temperature of storage tank and the pipeline, 20 t boiler, steam by 1 2 sets of 10 t boiler boiler system. More flow meter manufacturers choose model price quote you are welcome to inquire, here are the wireless steam flow acquisition system application in the oil storage enterprise the article details. Xingzhong sinochem petroleum transport ( Zhoushan) Zhongshan reservoir area in order to ensure production operation, terminal adopts steam heating way to keep in storage tanks and the oil temperature inside the pipe, the steam from 1 20 t boiler, boiler system composed of two 10 t boiler production. In recent years, the company in accordance with the thinking of the lean management, increasing the energy metering management requirements, in order to to scientific control of steam system, improve the efficiency of steam, for the use of steam condition need to be accurate measurement and statistical analysis. Before the target flowmeter for flow in the steam piping network of a reservoir data collection, statistics to rely on manual meter reading data, but the target flowmeter is vulnerable to steam pipeline in & other; Water hammer & throughout; Phenomenon, frequent failure and low efficiency of manual meter reading way, real-time performance, statistical analysis of the effect is not obvious. To this end, the reservoir by installing a new type of steam flowmeter, using wireless transmission technology, steam flow acquisition system is established, and the real-time uploaded to the PC software for statistical analysis, form report. System built for the energy management of the company provides a real-time and reliable data support, at the same time, realize the real-time monitoring system for reservoir steam, for steam use controls, to promote saving energy and reducing consumption. 1 system overall structure design of steam flow collection system in front of the tank farm all insulation jars of exports and the subcontract, boiler main line installed a total of 52 sets of steam flowmeter, the intelligent wireless technology, four areas will flow meter data transmission to the area of wireless gateway, then uploaded to the PC, through the man-machine interface to display all kinds of data. Wireless traffic acquisition system working principle is shown in figure 1. 1 through in-depth research, integration of steam flowmeter selection for more than 3051 SFC series integrated parameter orifice meter. 25%, range than for 14:1, has the features of high precision, wide range than and good stability. Can on-line detection temperature, pressure and flow rate of three variables, online and automatic complete compaction density compensation in the header, show mass flow and heat, especially suitable for steam metering system. With whole casting process and integration in the form of installation, the flowmeter has high impact resistance performance, effectively solve the impact on equipment and water hammer problems of steam. 2 intelligent wireless adapter per 3051 SFC flowmeter is configured with a THUM775 intelligent wireless adapter, become a wireless node. Wireless adapter THUM ( ｔｈｅｈａｒｔｕｐｇｒａｄｅｍｏｄｕｌｅ） Is based on the intelligent device of the microprocessor, is designed for the aerial cable HART instrument development, at the same time the four process parameters of instrument variables and equipment diagnosis information is converted into a WirelessHART wireless signal output, with standard WirelessHART gateway wireless communication. Wireless adapter with 4 ~ 20 ma loop connection, from the loop, but not any circuit, even if the malfunction of the adapter loop current also stay the same, without the battery. 3 intelligent wireless gateway wireless gateway in the system of wireless data buffering effect, it is the connection link, the field instrument and the upper machine realizes the network management, data management and equipment management of the three big functions. The system of wireless gateway chose 1420 intelligent wireless gateway, each gateway management wireless nodes within the scope of its jurisdiction, zui can manage 100 wireless nodes. Wireless gateway can grid architecture are built automatically according to the location of distribution network, once the network set up, how will automatically find around a fixed or temporary barriers zui preferred method of achieving high safety and reliability of wireless data collection, and use the standard interface will collect the state data accurate and reliable process parameters and equipment into the upper machine, in order to realize the flow meter and process parameters of monitoring on the spot, as an intelligent wireless instrument and PC interface of man-machine interface, support the Modbus and OPC protocol. 4 GHZ public spectrum, communication path redundancy, data reliability is more than 99%. 2 wireless technology, the application advantages of the steam flowmeter using the wireless network has the characteristics of self-organizing, adaptive, self repair, in the communication path is interference, wireless network equipment can automatically to choose other redundant path to communicate, guaranteed the normal communication of all kinds of parameters. Therefore, wireless technology applied in steam flow measurement has a great advantage.
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Submersible electromagnetic flowmeter must buy a flap closure in channel, put on diving electromagnetic flow sensor at the bottom of the baffle, baffle stop channels, forcing current only flows from the flow sensor, with the original high velocity to the downstream, upstream water level, to carry the high board from paddle upstream and downstream water level difference h, the water level difference potential energy into velocity & upsilon; The kinetic energy of the, i. e. , v = k√ 2g( ha- hd) =K√ 2 gh2 ( 3) K - type - Factor: the g - Acceleration of gravity submersible electromagnetic flowmeter, liquid flow status is submerged orifice flow, orifice flow speed has nothing to do with the sinking depth of the hole under the free surface, only depends on the upstream and downstream water level difference. In other words, the flow measurement value and the flow sensor ( Or shunt model) Installation position has nothing to do, but the requirements as low as possible, make it always in the process of running in the submerged flow state. Through the electromagnetic flowmeter the flow rate of the flow sensor is commonly 2 ~ 3. 5 m/s, the upstream heading up between 100 ~ 300 mm. In large flow and can not use a large flow sensor, in order to avoid water level difference is too big, can use shunt model as shown to enlarge the flow capacity. Distribution model of flow passage shape size and flow sensor are exactly the same. N distribution model and a sensor installed on the baffle and together, the actual traffic is the sensor on the measured flow ( n + 1) Times. Flow sensor under the conditions of different flow rate and allow the water level difference diameter and shunt model number matching.
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Under the first to introduce the advantages of electromagnetic flowmeter. Electromagnetic flowmeter in the measuring tube is a shine to a smooth and straight pipe, due to unfavorable blocking suitable for measuring the liquid containing solid particles or fibers solid two phase fluid, such as pulp, coal water slurry, pulp, mud and water, etc. Due to the induced voltage signal is formed in the whole space full of magnetic field, is the average of the pipeline on the surface of the load, the amount of straight pipe required sensor is shorter, length of 5 times the pipe diameter. Measurement accuracy is not affected by fluid density, viscosity, temperature, pressure and conductivity changes, the influence of sensor induction voltage signal, and a linear relationship between the average flow, so the high precision measurement. In measuring the pipe flow, so there is no additional pressure loss. Measurement of the pipe have no moving parts, so very long sensor life. Electromagnetic flowmeter is not formed by the testing flow pressure loss, the resistance of the meter is only the same along the length of pipe resistance and energy-saving effect is remarkable, for low resistance loss of * is suitable for big diameter water pipes. Electromagnetic flow sensor part only lining and electrode contact with the liquid being measured, as long as reasonable selective electrode and lining materials, corrosion resistance and wear resistance. *, electromagnetic flowmeter with two-way measurement system, the measurable positive flow, reverse flow. Of course, any product are not perfect, electromagnetic flow meter, there are some inevitable shortcomings. Electromagnetic flowmeter can measure gas, steam and liquid containing a higher proportion of large air bubbles. Second, not measuring liquid conductivity is very low, such as oil products and organic solvents etc. One more thing, due to the limitation of some material, such as lining liquid cannot be used for high temperature measurement. In general, the flow of electromagnetic flowmeter is a very common measuring instrument, just choose the right type, and master some skills in daily use process and maintenance method, can make flowmeter play a * value, provide convenience and services in the industrial production.
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The measurement characteristics of the mass flowmeter and the uncertainty in the measurement process The measurement characteristics of the mass flowmeter are divided into static characteristics and dynamic characteristics, which will be introduced in detail below. 1. Static characteristics: It refers to the relationship between input and output when the measured value is in a steady state. The basic requirements for static characteristics are: the input is zero and the output is also zero, and the output and input form a unique correspondence. The parameters that characterize the static characteristics include: static transfer function, static characteristic curve, instrument coefficient, outflow coefficient, flow range (range), linearity, sensitivity, hysteresis, stability, zero drift, repeatability, accuracy and pressure loss, etc. 2. Dynamic characteristics: It refers to the time response or frequency response characteristics of the output value when the input value of the measured object changes rapidly. (1) Time domain When the input value of the measured object is a step signal, the time response characteristics of the output value. Its quality index can be expressed by time constant. The time constant refers to the time when the output value reaches 63% of the steady-state value, represented by S. (2) Frequency domain The frequency response characteristics of the output value when the input value of the measured object changes according to the frequency of the sine wave. The characteristic that the ratio of the output value of the flowmeter to the input value changes with frequency is called the frequency response characteristic. 3. Composition of measurement errors The characteristics of flow measurement errors can be divided into systematic errors, random errors and gross errors. 1. Uncertainty of measurement (1) Type A evaluation of standard uncertainty (2) Type B evaluation of standard uncertainty (3) Combined standard uncertainty (4) Expanded uncertainty (5) Measurement uncertainty Calculation and expression of degree 2. Uncertainty of flow measurement Firstly calculate the uncertainty of type A and type B of each parameter, and then calculate the combined standard uncertainty and expanded uncertainty.
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This is how thermal mass flowmeters originally developed. With the rapid development of science and technology, mass flowmeters have been paid more and more attention. As an important type of mass flowmeters, thermal mass flowmeters have been widely concerned by customers! Then, thermal mass flowmeters How did it develop step by step? A thermal mass flowmeter is a flow meter that measures the mass of a liquid or gas by using the relationship between the energy required to raise the temperature of the liquid to a certain value during heating and the mass of the liquid. It is generally used to measure the mass flow rate of gases such as gas. It has the characteristics of small pressure loss, large flow range, high precision, high repeatability, high reliability, small size, easy maintenance and not easy to damage. The early thermal mass flowmeter directly put the ring and temperature measuring element into the liquid to contact with the liquid. It is a contact flowmeter. Due to the common problems of corrosion, wear and explosion protection in the field environment, its industrial application is restricted. a great restriction. By the 1950s, a boundary layer flowmeter that was not in contact with the liquid was proposed, which overcomes the shortcomings of the contact flowmeter, but the measurement results are affected by the medium parameters (such as thermal conductivity, ratio, viscosity) and the vibration of the environment. and so on. By the 1970s, the heat-distribution thermal mass flowmeter based on measuring the temperature distribution of liquids was favored in China due to its unique advantages, but it had a fatal shortcoming, that is, it only detected tiny flows, and was only suitable for small Pipe diameter measurement, large diameter liquid measurement it is helpless, it is on the basis of these flowmeters, people have designed a plug-in thermal mass flowmeter, it has been developed rapidly in China, can be used for Measure gas flow in large pipe diameters. In the past, thermal mass flowmeters were mainly thermally distributed, and were used in the measurement of small gas flow rates. They were mostly used in the semiconductor industry, heat treatment furnaces, analytical instruments, etc. for the measurement and control of hydrogen, oxygen, ammonia and other flowmeters, as well as for the measurement of leakage in the valve manufacturing process. amount etc. In recent years, the application of intrusive and insertion thermal flowmeters with heat dissipation effect, environmental protection and large and medium-sized pipelines in the process industry have developed rapidly in foreign countries. The detection rods composed of multiple groups of detection elements arranged radially and segmented are mostly used in large and medium-sized pipelines in HVAC (heating ventilation and air conditioning) projects in the form of insertion. It is also used to monitor the total amount of SO2 and NOX emissions in the boiler large pipe air intake and flue exhaust. Although the micro-liquid mass thermal flowmeter has a history of more than 20 years, its industrial application has not developed rapidly until recent years. Now several manufacturers have produced various types of thermal distributed thermal flowmeters and put them on the market. It is believed that the Chinese flowmeter market will be more prosperous in the future. Since the mass flowmeter is generally relatively simple in application, it can be put into use after simple debugging as long as it is installed correctly. In daily use, you only need to adjust the zero point of the meter regularly, and there is almost no need for maintenance, and you need to pay attention to it when using it. The success of the flowmeter application is directly related to the installation. In addition to the normal installation requirements, special attention should be paid to reducing the impact of vibration, because the mass flowmeter works based on the principle of vibration, and external vibration will introduce interference. However, as little external interference as possible is undoubtedly beneficial to the measurement, so the vibration from the pipeline and the site environment should be avoided as much as possible. The mass flow meter has high accuracy and its price is also high, which requires careful maintenance, such as equipping it with a high-quality regulated power supply, and frequent inspections of on-site vibration and operating conditions, etc., to ensure the safety of the meter and the instrument. . During the use of the instrument, it is necessary to carry out accurate zero point calibration under the conditions of use. The mass flow meter belongs to the height measuring instrument used on-line. The drift of the zero point will affect the measurement results. It must be calibrated regularly during long-term use. It is necessary to avoid the occurrence of exceeding the range of the instrument used, which will cause a decrease in the measurement accuracy of the instrument, and in severe cases, it will cause damage to the instrument. For example, operations such as steam sweeping that exceed the operating temperature range of the instrument will damage the detection coil and make the instrument unusable. Usually, when using the mass flowmeter, it is necessary to prevent artificial power failure and disconnection. Take the method of cutting off the power and disconnecting the signal line so that the flowmeter does not measure for a short time, which will cause measurement disputes. Such problems should be paid attention to. The solution is to lock the instrument box, and a special person is responsible for the management.
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