18-05-2012, 03:55 PM
REFRIGERATING HYDROGEN DRYER
H2 dryer operation manual.pdf (Size: 418.51 KB / Downloads: 145)
SPECIFICATIONS
Device Composition (See Fig. 01)
The Dryer is mainly composed three parts: refrigerating system, hydrogen moisture removal system
and electrical control system. The refrigerating system consists of a refrigerating compressor unit, a
thermal expansion valve and an evaporator. The hydrogen moisture removal system is made up of a
heat recovered, two coolers and a water tank. And the electrical control system consists of an
electric control box, a defrosting solenoid valve, a temperature controller, a water level controller.
System Configuration and Operating Principle (See Fig. 02)
Refrigerating System
The refrigerating compressor sucks in the low pressure gas of the refrigerant from the evaporator.
After compressed, it turns into a high heat and high pressure gas, then comes into the condenser,
and makes heat exchanging with air (or water). And then releases the heat refrigerant absorbed in
the evaporator and the heat produced by the work done of the compressor. Now the high
temperature and high pressure gas has been condensed into liquid refrigerant with high pressure.
The high pressure liquid refrigerant, then through the receiver and dry filler after throttling and
pressure reducing by a thermal expansion valve, it comes into the evaporator and absorbs the heat
of hydrogen in the cooling unit, and makes refrigerant be boiling and evaporate it into gas, which
comes into the compressor via the suction pipe and will be compressed by the compressor again.
Repeating the process again and again, the heat in hydrogen is absorbed constantly. The
temperature of moisture in hydrogen decreases under that of the dew point. The moisture will be
separated out, achieving the result of freezing and removing the moisture.
Hydrogen Moisture Removal System
Heat Recovered
The heat hydrogen gas with moisture from the generator comes into one of operation dryer, first it is
with cold hydrogen gas (return gas) to make heat exchanging in heat recovered so as rising return
gas temperature and make inlet gas temperature down. It is the first step of temperature decreasing
to remove moisture.
Cooler
The heat hydrogen gas with moisture passed through the heat recovered comes into the cooler via
the connection pipe, making heat exchanging on the surface of the evaporator of the refrigerating
system. The temperature of the hydrogen decreases under that of the dew point so that the moisture
will be separate out from hydrogen with frost form. And the drying hydrogen is returned to the
generator through the heat recovered again.
Water Tank
The condensed water discharged from the cooler drains into the water tank via the drain pipe. When
the water in the tank reaches a certain volume the water level switch will send out an alarm signal at
local and remote. Then the drain valve should be opened to drain the water out.