Abstract: three kinds of new type
flowmeter scale application in acetic acid plant information produced by excellent
flow meter, flow meter manufacturer to offer you the quotation.
Introduction the flow measurement is zui in chemical plant to a wide range of process requirement.
Principle of flow measurement method is varied, each are not identical, such as: differential pressure type, float type, positive displacement, turbine type, spiral type, ultrasonic type, quality of coriolis force, heat, electromagnetic.
More flow meter manufacturers choose model price quote you are welcome to inquire, here are three kind of new flow meter scale acetic acid plant in the details in this paper.
Introduction the flow measurement is zui in chemical plant to a wide range of process requirement.
Principle of flow measurement method is varied, each are not identical, such as: differential pressure type, float type, positive displacement, turbine type, spiral type, ultrasonic type, quality of coriolis force, heat, electromagnetic, target type and so on.
General according to the technical requirements such as operating temperature and pressure;
Medium viscosity, thermal conductivity, corrosion strength;
Pipe allowed pressure drop size;
Measurement precision is high and low, prices and on-site maintenance convenience to choose the flow pattern.
Low pressure methanol carbonylation synthesis of acetic acid with carbon monoxide and methanol as raw materials, mainly carbonyl rhodium catalysts, hydroiodic acid and methyl iodide as catalyst promoter, at 190 ℃, 2.
Synthesized under the condition of 8 mpa crude acetic acid, and then by flash, separation and purification from pure acetic acid products, is currently in the production of acetic acid zui advanced technology.
Domestic use of the technology in the production of acetic acid plant construction unceasingly, is in the stage of rapid development.
This process is characterized by high temperature, strong corrosion resistance, corrosive medium in addition to a variety of concentration and temperature of acetic acid, and hydroiodic acid and methyl iodide is extremely strong corrosive medium, such as complex corrosion environment.
Along with the advance of the flow measurement technology, in view of the acetic acid plant in the original part of the orifice plate, vortex, turbine, oval gear flow meter is easy to wear, is medium corrosion leakage, short service life, maintenance as well as large amount of work is not enough, when acetic acid plant, according to the technological requirements and the characteristics of different media, a variety of new type flowmeter instead of the original design of the flowmeter, has achieved good result in production practice, both can meet the technical requirements and greatly reduce the intensity of investment and maintenance.
Here is a brief introduction to the use of three kinds of flow meter.
Integration of 1 T pig 1 meter.
1 pig pig and the characteristics of the flowmeter flowmeter is based on the Bernoulli principle of conservation of energy and pitot tube measurement principle and differential pressure developed velocity-equalizing tube flowmeter.
Its development has experienced three stages: first generation circular pig, detection lever is circular cross section;
Second generation gem Ⅰ type, detection rod section is a diamond, the second generation of improved gems Ⅱ type, test section is to improve the diamond bar;
Third-generation T pig, measuring rod section is T.
T pig the essence of the flowmeter with excellent blocking resistance, higher accuracy and good stability, outstanding signal-to-noise ratio and span ratio, integration installation temperature pressure compensation, installation is convenient wait for a characteristic.
Pig the flowmeter can measure the medium or volume flow to mass flow, T pig ba combined with multi-parameter transmitter can measure the mass flow medium, multi-parameter transmitter with built-in precision differential pressure transmitter, absolute pressure transmitter, temperature transmitter, high-speed CPU and large capacity data storage.
The memory to store all kinds of fluid under different pressure and temperature in temperature compensation formula, you need to use the physical parameters, including density, viscosity, gas constant, compressibility, and constant volume specific heat data, according to the actual change of fluid pressure, temperature, real-time, dynamic zui full compensation calculation, zui much to eliminate the cause factors of flow measurement error.
For steam flow measurement automatically judge is in a state of saturated and unsaturated * hot, and automatically compensate calculation.
About 1% accuracy, measuring rod material has stainless steel, hartz alloy, zui high process temperature up to 677 ℃.
Pig the flowmeter measurement, especially suitable for gas and steam relatively orifice meter integrated pig ba flowmeter has the following main advantages: a single integrated assembly, save the parts;
Don't need to bring pressure tube;
To improve the reliability and accuracy of the meter,
Reduce the installation cost and time;
Reduce the intensity of maintenance and cost;
Reduce the potential for leakage, reduce environmental pollution;
Lower pressure drop, to save energy;
More able to adapt to the load change.
1.
2 pig ba flowmeter selection considerations pig mechanical dimensions of the flowmeter is, according to a pipe size tailored to install the flow measurement range is calculated according to the data provided by the user flow, calibration.
Thus provide traffic data and pipeline data must be correct, otherwise it will cause big measurement error.
T pig although the flowmeter has the essential features of wall, but two things need to pay attention to the following: (1) whether there is sticky sticky impurity in the fluid, such as without electricity decoking, dust removal water gas, tar and dust will stick on the sensor of gas, greatly affect measurement accuracy.
Device (2) in the fluid impurity is more, and intermittent operation, there are often parking and long time.
In block, impurities may be dry, and scale on the surface of the sensor, long will jam the take pressure.
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