What are the common problems and solutions for the Yangke hood heat recovery system?

What are the common problems and solutions for the Yankee hood heat recovery system? Here are a few points summarized by the editor. Let's take a look together.

1. The exhaust humidity is too low (the exhaust air volume in the hood is too high)

Influencing factors: ① High energy consumption of cadres; ② Low heat recovery and heat exchange efficiency.

Possible reasons: ① Failure of humidity measuring instruments; ② The exhaust air volume is too large (the intake valve is opened too wide or the fan speed is too high); ③ The inlet air valve of the exhaust fan may be stuck in the open position and not working; ③ Moisture may leak from the top of the hood into the factory building; ④ The evaporation rate of cadres is lower than the design value.

Solution: ① Check whether the position of the inlet air valve of the exhaust fan/the frequency setting and function of the variable frequency fan are appropriate; ② Check if the set values and functions of the automatic measurement system are appropriate; ③ Check the sealing of the upper part of the hood.

2. The zero position of the hood is too high (relative to the exhaust air volume of the hood, the supply air volume of the hood is too small)

Influencing factors: ① High energy consumption of cadres; ② It is possible to generate condensation on the inner surface of the hood and the hood frame.

Possible reasons: ① There is a malfunction in the air volume measurement instrument; ② The exhaust is too large (the exhaust valve is opened too large and the exhaust fan speed is too high); ③ The air supply volume is too small (the intake valve is too small to be close or stuck in the closed position, and the fan speed is too low); ④ There are non working fans in the air supply fan; ⑤ The heat exchanger and steam heater on the air supply side are blocked; ⑥ Blocked or leaking air supply ducts.

Solution: ① Check the function of the fan and the condition of the impeller; ② Check the tension of the fan belt; ③ Check the position of the inlet air valve of the fan and the status of the fan frequency; ④ Check the position of the air valve on the air duct; ⑤ Check the set values and functions of the automatic measurement system; ⑥ Check the cleanliness of the air to air heat exchanger and steam heater; ⑦ Check the cleanliness of the air duct.

3. The air supply temperature is too low

Influencing factors: It is possible to generate condensation on the inner surface of the hood and the hood frame.

Possible reasons: ① Damaged steam heater; ② No steam enters the steam heater; ③ Poor drainage of steam heater; ④ Air supply temperature setting error, or temperature measurement failure.

Solution: ① Check the status of the steam heater; ② Check the function of the air supply steam heating system; ③ Check temperature measuring instruments and temperature settings.

That's all for today's introduction of the knowledge of Yankee hood. I hope it can help everyone. If you want to learn more about hood knowledge, please follow Fengxin Technology.