Why is it necessary to start the standby unit first when commissioning a catalytic unit, and only switch to the main unit after it reaches a stable state?

This post was last edited by Green Lotus on 2019-10-29 at 20:08. The smoking machine was turned on directly; at this time, the temperature and load were insufficient. You can start once the feed is stable.

Energy-efficient, easy to operate, safe; in some cases, three-unit operation requires a smoke extractor for propulsion

The standby machine is driven by a motor; the flue gas burner is turned on only after the feeding becomes stable and the temperature of the flue gas rises

Power issues; the second one is the problem of the range hood speeding up and heating up

1. There is no fixed order as to whether the main unit or the backup unit should be started first; in the absence of any constraints imposed by the power grid, no such requirement exists. 2. In some areas, the voltage drop caused by the direct start of high-power motors is not allowed by the power grid, and this constitutes the first constraint. In such cases, it is necessary to start the backup units with lower power first. 3. When starting up, a main unit equipped with an exhaust fan is used; the conditions required for starting the exhaust fan – such as the concentration and particle size of the exhaust gases, as well as the rate of temperature increase – can all be controlled through the high-temperature valve at the inlet of the exhaust fan. 4. During the period when the inlet valve is closed after the unit is started but before the exhaust fan begins to operate, the exhaust fan runs idly, in what is commonly referred to as a wind-running state. The outlet temperature of the exhaust fan rises and exceeds the normal exhaust temperature, which has a negative impact on the strength of the rotor. It is therefore necessary to inject a higher amount of cooling steam than usual; provided that the exhaust fan is designed with this functionality, this eliminates the second constraint associated with starting the main unit equipped with an exhaust fan first.

As a supplementary point, during operation, agent leakage is inevitable, and the catalyst can damage the blades of the smoke extractor

This post was last edited by Refiner on 2020-1-31 09:47. The most crucial question is whether the main fan motor can drive three units during design; if so, you can start the main fan first, without the need to switch between primary and backup units. In the early days, the power grid was weak; the motors of the three units were small, making it difficult to drive them, and this could easily overwhelm the power grid.

That’s because your system is designed with a backup unit, while my setup doesn’t have one – it only has the main unit. During operation, the motor starts directly, and once the fuel injection functions properly, the exhaust fan is activated