Installation of burner blower flow meter
Thread Content
For the 1.4 million-ton catalytic cracking unit, there is a control valve at the inlet of the blower for the carbon monoxide incinerator; there is no control valve behind the blower, only an outlet. The blower is equipped with variable frequency control, and a flow meter is installed at the inlet of the blower. I would like to ask why the flow meter for the blower is placed before the inlet of the blower. Additionally, what is the purpose of the control valve located before the blower?
This post was last edited by longziyun on 2021-1-27 at 20:11. Blowers or exhaust fans use inlet valves to control the inlet flow rate; generally, the outlet valve is kept fully open to minimize backpressure. The flow rate is controlled by the opening degree of the inlet valve, primarily to prevent the fan from experiencing excessive current. This should be specified in the fan’s operating procedures. An inlet control valve is implemented by controlling the inlet flow rate.
The outlet pressure is high, having reached the value specified in the fan’s design. Is it possible to switch to inlet control now? What is the sequence of operations when starting the blower? Does one start with the outlet first?
The outlet pressure is high, having reached the value specified in the fan’s design. Is it possible to switch to inlet control now? What is the sequence of operations when starting the blower? Does one start with the outlet first?
Of course, first fully open the outlet vent valve and start the fan; then fully open the outlet valve, gradually reduce the flow through the outlet vent, and slowly open the inlet valve. Keep an eye on the current meter on site, making sure that the current does not exceed the allowed level. As for whether the outlet pressure is high or low, it is a matter related to the compression ratio determined during equipment selection in the design process; a low outlet pressure is usually caused by the outlet vent valve not being closed, resulting in air leakage. The outlet pressure should reach the specified value to be considered normal.
Our unit currently has a fan outlet pressure of 6 kPa. There is no vent valve at the fan outlet; only a large butterfly valve is present there. At the inlet, there are louvers on the fan itself, as well as a control valve and a flow meter. The fan was designed to operate at an outlet pressure of 6 kPa. Currently, the backpressure is around 7.5 kPa. The opening degree of the large butterfly valve at the fan outlet is about 30 degrees, and sometimes the fan experiences surge
The high pressure on the outlet pressure gauge is due to the low opening degree of the outlet butterfly valve; all the valves at the fan’s outlet are fully open, and an opening of 30° should not be the case. Fan \"surge\" is also related to a small opening of the outlet valve.
Good heavens, with your skills you’re still trying to operate the equipment? The fan outlet valves are all open, completely open. Use an inlet baffle or variable frequency to regulate the flow rate
I just don’t understand the approach of the workshop supervisor; I think it’s wrong but I don’t dare to say anything
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