Just saw a question: what is a backblast instrument?
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Just saw a question: what is a backdraft instrument?
Is it the reverse airflow controller for self-cleaning air filters? That is to control the backflow solenoid valve to open automatically at regular intervals for backflow cleaning
The backflow meter operates on the principle of static pressure balance, and is mainly composed of an air supply pipe, a transmitter, a throttling element, a check valve, a rotameter, and a pneumatic filter pressure regulator. It can measure liquid level, flow rate, pressure, etc
Haven’t heard of it; I’m curious and looking forward to learning about it. . .
A back-blow instrument works by connecting the pressure tapping of the instrument to the clean air supplied via a flow-limiting orifice; by measuring the back pressure of the instrument, it is possible to determine flow rate, pressure, and liquid level. (The orifice in such devices is usually quite small, around 0.5 mm in diameter.) This type of instrument can be used in situations involving materials that tend to crystallize, are viscous, or prone to clogging, provided that the clean air blown in does not have any adverse effect on the process.
It’s a purging device, not something else. We use purge rotors, which are primarily used to perform soot blowing and clean the equipment pipelines
It is a system based on the principle of constant current at critical compression ratio; the system composition is as described on the fourth floor
It should mainly serve to provide isolation and prevent blockages in the pressure guiding tube
When blowing air into water through a tube, for the air to be able to escape from the tube, the pressure of the gas must be at least equal to the pressure of the water at that location (with the tube kept vertical). That’s the principle behind it. In mechanical terms, it’s referred to as equilibrium; I can only explain it this way. The air blown into the water is also connected to the high-pressure side of the pressure transmitter, and that’s how it works
Using the principle of constant current at critical compression ratio, it is generally only possible to measure the liquid level in open containers, as well as in media for which low measurement accuracy is sufficient. This type of pressure measurement is required in all areas of the reaction zone in catalytic cracking units where catalysts are present. Although catalysts are considered to be in a flowing liquid state within the unit, they are actually solid particles; therefore, when measuring the pressure of this static medium that can easily clog the pressure sensing tubes, it is necessary to use backflow air along with the air pressure from the measuring instruments to determine the pressure inside the unit
The level transmitter for our fluidized bed granulator uses back-blowing to measure the level; it has a double-flange design, mainly to prevent blockage of the pressure tapping pipe.