Dehumidification method for spraying coating equipment

Mastering the correct coating process can save paint, obtain a coating film that meets the quality requirements, avoid the consumption of paint quality and physical strength, and reduce the probability of waste. Proper training on coating construction technology and turning this technology into a habit not only improves production efficiency, but also improves the quality of the coating film. The following will introduce you to the dehumidification method of spraying coating equipment.

1. Cooling and dehumidifying method

When cooled below the dew point temperature, the moisture in the air will condense into water. Remove the condensed water and reheat it to get low-humidity air. Can use freezing medium, ice water or salt water to cool the air. This situation belongs to enthalpy reduction and humidity reduction.

feature:

(1) When the surface temperature of the cooling coil is lower than 0°C, the condensed water will freeze on the surface of the coil, which reduces the cooling efficiency and the dehumidification effect, so that stable humidity cannot be obtained.

 

(2) Generally speaking, the limit of cooling and dehumidification is above the dew point temperature of 0°C.

 

(3) If the equipment becomes larger, the power consumption will increase and the operating cost will increase.

2. Compressed dehumidification method.

When the air is compressed, the moisture in the air will condense into water. Remove the condensed water and reheat it to get low-humidity air. The moisture in the atmosphere is expressed by the following formula.

X=0.622XPs/(P1Ps)

 

X: The absolute value of humidity Kg/Kg.

 

Pressure Kg/cm2abs. Absolute pressure for compressed air

 

Ps: partial pressure of steam Kg/cm2abs.

 

The above formula describes increasing the air compression capacity P, that is, reducing the absolute humidity X to achieve a lower humidity.

feature:

(1) Suitable for small wind, low dew point dehumidification.

 

(2) The cost of compressed electricity is higher.

 

(3) It is suitable for those who need high pressure and small amount of dehumidified air for instruments and controls.