Modes of Dehumidification:
1. Cooling dehumidification
The air is cooled to below the dew point, and then the condensed water is removed.
This method is effective under the condition that the dew point is 8 ~ 10 ℃ or more.
2. Compression dehumidification
Compress and cool the moist air to separate the moisture.
This method is effective when the wind volume is small but not suitable for the conditions of large wind volume.
3. Liquid absorption dehumidification
Lithium chloride solution spray is used to absorb moisture.
The dew point can be reduced to -20 ℃ or so, but the equipment is large, and the absorption liquid must be replaced.
4.Wheel-type desiccant dehumidification
The ceramic fibers of impregnated porous hygroscopic agents are processed into honeycomb-like runners for ventilation.
The dehumidification structure is simple, which can reach -60 ℃ or less through special combination of dew points.
This is the method used by Jierui.
NMP stands for N-Methyl-2-Pyrrolidone
Since NMP has high boiling point and low steam pressure under normal temperature, it can be easily condensed by cooling below normal temperature. According to the formula of Antoine, By means of its characteristic, recovery of NMP can be conducted by cooling( provided that water recovery amount is increased if dryer exhaust gas contains more water).
Advantages of VOC concentration rotors:
1.High performance & efficiency
Using High silica zeolites and activated carbons with enormous adsorption capacity allows our VOCconcentrator to flexibly treat various kinds of VOCs and work under different conditions of operation.
2.Capability of treating VOCs with high boiling point
Carbon material has a difficulty to treat VOCs with high boiling point due to its desorption temperature limit. In contrast, the characteristics of our zeolite rotors are incombustible and high heat resistance, which enables our VOC concentrator to use the adsorption air with high temperature.
3.Inertness
VOC easily polymerized by heat energy (e.g. styrene, cyclohexanone, etc) can be effectively treated by High-Silica zeolite.
4.Cleanability & activation by special heat treatment
Our zeolite rotors through calcining process have come to all inorganic material including the adhesive. Clogging in the rotor element might occur after a certain period of use.But, don’t worry!! The rotor is washable in a proper manner to remove accumulated dust.It’s even better that our zeolite rotor can be reactivated by heat treatment according to circumstances.
Typical Applications of VOC concentration rotors:
|
Industry |
Possible Facility/Product line subject to VOCs control |
Treated VOCs |
| Automotive/Parts manufacturer | Painting booth | Toluene, Xylene,Esters, Alcohols |
| Steel furniture maker | Painting booth, Oven | |
| Printing | Dryer | |
| Adhesive/Magnetic tape manufacturer | Coating process, Cleaning unit | Ketones, MEK,Cyclohexanone, Methylisobutylketones, etc. |
| Chemicals | Oil refinery, Reactor | Aromatic hydrocarbons, Organic acids, Aldehydes, Alcohols |
| Synthetic resin/ Glue Maker | Plastics,Plywood manufacturing process | Styrene, Aldehydes, Esters |
| Semi-conductor | Cleaning unit | Alcohols, Ketones, Amines |
Useful dew point conversion table:
| °Cdp | g/kg | °Fdp | gr/lb |
| -60 | 0.0055 | -76 | 0.039 |
| -59 | 0.0067 | -74.2 | 0.047 |
| -58 | 0.008 | -72.4 | 0.056 |
| -57 | 0.0092 | -70.6 | 0.064 |
| -56 | 0.0104 | -68.8 | 0.073 |
| -55 | 0.0122 | -67 | 0.085 |
| -54 | 0.0141 | -65.2 | 0.099 |
| -53 | 0.0159 | -63.4 | 0.11 |
| -52 | 0.0178 | -61.6 | 0.12 |
| -51 | 0.02 | -59.8 | 0.14 |
| -50 | 0.024 | -58 | 0.17 |
| -49 | 0.027 | -56.2 | 0.19 |
| -48 | 0.03 | -54.4 | 0.21 |
| -47 | 0.034 | -52.6 | 0.24 |
| -46 | 0.039 | -50.8 | 0.27 |
| -45 | 0.043 | -49 | 0.3 |
| -44 | 0.047 | -47.2 | 0.33 |
| -43 | 0.054 | -45.4 | 0.38 |
| -42 | 0.061 | -43.6 | 0.43 |
| -41 | 0.068 | -41.8 | 0.48 |
| -40 | 0.076 | -40 | 0.53 |
| -39 | 0.086 | -38.2 | 0.6 |
| -38 | 0.097 | -36.4 | 0.68 |
| -37 | 0.11 | -34.6 | 0.77 |
| -36 | 0.122 | -32.8 | 0.85 |
| -35 | 0.137 | -31 | 0.96 |
| -34 | 0.151 | -29.2 | 1.1 |
| -33 | 0.168 | -27.4 | 1.2 |
| -32 | 0.186 | -25.6 | 1.3 |
| -31 | 0.21 | -23.8 | 1.5 |
| -30 | 0.23 | -22 | 1.6 |
| -29 | 0.25 | -20.2 | 1.8 |
| -28 | 0.28 | -18.4 | 2 |
| -27 | 0.31 | -16.6 | 2.2 |
| -26 | 0.35 | -14.8 | 2.5 |
| -25 | 0.38 | -13 | 2.7 |
| -24 | 0.43 | -11.2 | 3 |
| -23 | 0.47 | -9.4 | 3.3 |
| -22 | 0.52 | -7.6 | 3.6 |
| -21 | 0.57 | -5.8 | 4 |
| -20 | 0.63 | -4 | 4.4 |
| -19 | 0.69 | -2.2 | 4.8 |
| -18 | 0.76 | -0.4 | 5.3 |
| -17 | 0.84 | 1.4 | 5.9 |
| -16 | 0.93 | 3.2 | 6.5 |
| -15 | 1.01 | 5 | 7.1 |
| -14 | 1.11 | 6.8 | 7.8 |
| -13 | 1.22 | 8.6 | 8.5 |
| -12 | 1.33 | 10.4 | 9.3 |
| -11 | 1.45 | 12.2 | 10.2 |
| -10 | 1.6 | 14 | 11.2 |
| -9 | 1.74 | 15.8 | 12.2 |
| -8 | 1.9 | 17.6 | 13.3 |
| -7 | 2.1 | 19.4 | 14.7 |
| -6 | 2.3 | 21.2 | 16.1 |
| -5 | 2.5 | 23 | 17.5 |
| -4 | 2.7 | 24.8 | 18.9 |
| -3 | 2.9 | 26.6 | 20.3 |
| -2 | 3.2 | 28.4 | 22.4 |
| -1 | 3.5 | 30.2 | 24.5 |
| 0 | 3.8 | 32 | 26.6 |
| 1 | 4 | 33.8 | 28 |
| 2 | 4.3 | 35.6 | 30.1 |
| 3 | 4.7 | 37.4 | 32.9 |
| 4 | 5 | 39.2 | 35 |
| 5 | 5.4 | 41 | 37.8 |
| 6 | 5.8 | 42.8 | 40.6 |
| 7 | 6.2 | 44.6 | 43.4 |
| 8 | 6.6 | 46.4 | 46.2 |
| 9 | 7.1 | 48.2 | 49.7 |
| 10 | 7.6 | 50 | 53.2 |
| 11 | 8.1 | 51.8 | 56.7 |
| 12 | 8.7 | 53.6 | 60.9 |
| 13 | 9.3 | 55.4 | 65.1 |
| 14 | 9.9 | 57.2 | 69.3 |
| 15 | 10.6 | 59 | 74.2 |
| 16 | 11.3 | 60.8 | 79.1 |
| 17 | 12.1 | 62.6 | 84.7 |
| 18 | 12.9 | 64.4 | 90.3 |
| 19 | 13.7 | 66.2 | 95.9 |
| 20 | 14.6 | 68 | 102.2 |
| 21 | 15.6 | 69.8 | 109.2 |
| 22 | 16.6 | 71.6 | 116.2 |
| 23 | 17.7 | 73.4 | 123.9 |
| 24 | 18.8 | 75.2 | 131.6 |
| 25 | 20 | 77 | 140 |
| 26 | 21.3 | 78.8 | 149.1 |
| 27 | 22.6 | 80.6 | 158.2 |
| 28 | 24 | 82.4 | 168 |
| 29 | 25.5 | 84.2 | 178.5 |
| 30 | 27.1 | 86 | 189.7 |
| 31 | 28.8 | 87.8 | 201.6 |
| 32 | 30.5 | 89.6 | 213.5 |
| 33 | 32.4 | 91.4 | 226.8 |
| 34 | 34.4 | 93.2 | 240.8 |
| 35 | 36.4 | 95 | 254.8 |
| 36 | 38.6 | 96.8 | 270.2 |
| 37 | 40.9 | 98.6 | 286.3 |
| 38 | 43.4 | 100.4 | 303.8 |
| 39 | 46 | 102.2 | 322 |
| 40 | 48.7 | 104 | 340.9 |
| °Cdp | g/kg | °Fdp | gr/lb |