Traditionally, the microelectrolysis data selected for microelectrolysis technology is generally iron filings and charcoal. It needs to be activated by acid and alkali before application. The process of application is very simple to passivate the knot, and because iron and charcoal are physical touches, between the sewage flowmeters. It is very simple to form the isolation layer so that the micro-electrolysis can not continue and lose the effect, which results in frequent replacement of the micro-electrolysis data, not only the high workload, but also the disposal effect and power of the wastewater. In addition, the surface area of ​​the traditional micro-electrolysis data is too small, which makes the wastewater disposal demand long, and increases the capital cost of tons of water, which seriously affects the application and implementation of micro-electrolysis technology.
In order to eliminate the influence of the uneven flow velocity of the cross-section in the pipeline on the measurement accuracy, the flow sensor upper and lower jaws should have a certain straight pipe section, or a device rectifier to replace some straight pipe sections. Generally, the upstream straight pipe section is not less than 15D, and the lower jaw straight pipe section is not less than 5D (D is the nominal diameter of the flow sensor).
In order to eliminate the backflow, uneven flow velocity and swirling effect, the rectifier can be installed upstream. At this moment, some straight pipe lengths upstream of the flow sensor are L=10D. If it is 15-20D, the measurement accuracy can reach the calibration accuracy.
When the measured liquid contains solid impurities, it should be in the upstream filter of the flow sensor. The mesh of the filter is 20-60 mesh (3-9 mesh/cm2), and the general flow sensor has a smaller mesh diameter. The orientation of the filter equipment should be considered to facilitate the disassembly and assembly of the filter.
When mixing liquids in a liquid or measuring a liquid that is easily vaporized, an air separator (degasser) should be installed.
If the measured liquid is easily vaporized, in order to prevent cavitation, the pressure at the outlet end of the flow sensor should be higher than the following formula Pmin:
Pmin = 2â–³P 1.25Pv
Where: Pmin—minimum pressure; ΔP—pressure loss of the meter under the maximum flow rate;
Pv—The full steam pressure of the liquid to be measured at the highest operating temperature will cause the bearing life to be too short when the flow rate of the flow sensor is too large. Generally, the flow rate will be adjusted to a suitable size through the valve, and the valve should be installed under the flowmeter.
In order to not interrupt the fluid transportation during the repair, the bypass valve is generally installed in the upper and lower è´± equipment shut-off valves of the flow sensor, and the bypass pipe should be ensured that the bypass pipe does not leak when the bypass valve is closed.
If a reverse flow can occur, a check valve should be added to prevent reverse fluid movement.
The flow sensor should be concentric with the pipe and the seal must not protrude into the pipe.
In order to prevent gas collection within the flow meter, the flow meter does not have the device at the highest point of the horizontal line.
If the flowmeter equipment is at the low point of the pipeline, the equipment discharge valve should be placed on the pipeline to regularly discharge the sediment.
The front and rear pipes of the flow sensor should be supported reliably so that there is no significant oscillation.
When cleaning the newly laid pipeline, a short pipe should be connected to the flow sensor of the equipment first, and then the flow sensor should be installed after the cleaning is completed.
When measuring the temperature of the fluid, it should be measured at the length of the nominal diameter of the pipe 5 times under the flow sensor.
It has a wide range of measurement and has been widely used in various pipelines for water supply and drainage, industrial recycling, sewage disposal, oil and chemical reagents, as well as compressed air, full and superheated steam, natural gas and various media flows. Used in automated control systems.
The current system talks about the key points of the process of compressed air flowmeter equipment:
Reasonably select equipment locations and environments.
Avoid strong power equipment, high-frequency equipment, strong power switch equipment; avoid the impact of high-temperature heat sources and radiation sources, avoid fierce sensation and strong corrosive environment, etc., together with equipment maintenance convenience.
It is necessary to have a satisfactory straight pipe section for the upper and lower jaws.
If there are two 90s on the same plane upstream of the sensor device point. For elbows, the upstream straight pipe section is ≥25D, and the lower straight pipe section is ≥5D.
If the upstream of the sensor device point has two 90 on different planes. For elbows, the upstream straight pipe section is ≥40D, and the lower straight pipe section is ≥5D.
The regulating valve should be located outside the lower jaw 5D of the sensor. If it is necessary for the device to be upstream of the sensor, the straight pipe section upstream of the sensor should be no less than 50D, and the lower jaw should be no less than 5D.
The piping of the equipment up and down should be concentric with the sensor, and the coaxial error should be no less than 0.5DN.
The pipeline adopts the oscillating method.
The sensor tries to prevent the device from oscillating on a pipe with strong oscillations, especially lateral oscillation. If it is necessary to use the equipment, it is necessary to adopt the vibration reduction method, and set the pipe fastening equipment at the upper and lower sides of the sensor 2D, and add the anti-vibration pad.
Equipment on horizontal pipes is the most common method of equipment for flow sensors.
When measuring the gas flow, if the measured gas contains a small amount of liquid, the sensor should be at a higher position in the pipeline.
When measuring the liquid flow rate, if the measured liquid contains a small amount of gas, the sensor should be in the lower part of the pipeline.
The sensor is in a straight piped device.
When measuring the gas flow, the sensor can be placed on a straight pipe with unlimited flow. If the gas to be measured contains a small amount of liquid, the gas flow should be from bottom to top.
When measuring the liquid flow, the liquid flow should be from bottom to top: this will not attach the liquid component to the probe sewage treatment process. China's primary rivers and lakes are polluted by phosphorus, and the eutrophication is severe. The National Environmental Protection Agency controls phosphorus pollution. A relatively strict specification has been drawn up for phosphorus emissions. The chemically-enhanced biological phosphorus removal sewage disposal technology mainly removes organic pollutants and various shapes of phosphorus in the sewage. The sewage treatment technology integrates chemical phosphorus removal and biological phosphorus removal, and the flow totalizer passes through the anaerobic digestion biological system. Volatile organic acid is produced in the activated sludge, and it is used as a matrix for the growth of polyphosphate bacteria or as a nutrient. The phosphorus-producing bacteria are selectively propagated in the activated sludge and returned to the biological system to dispose of the biological sewage. The system works in the high-efficiency phosphorus removal state; the phosphorus release from the sludge under anaerobic conditions is eliminated by chemical phosphorus removal. This is a high-efficiency municipal sewage treatment technology. It is satisfied with the demand for further phosphorus removal on the basis of conventional secondary sewage treatment in order to deal with the differentiation and differentiation of water bodies.
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