How to select ceramic lined valve type in the ash disposal system of coal power plant
In the ash disposal system of coal power plant , ceramic
lined valve is a important component of dry ash transporting system and
pipeline system .How to make these valves works well in their position ,it is
important to select right valve at for right position .
Refer to pneumatic transporting ash system ,we have to
study the component of bin pump and its working theory . Bin pump is make up of
feed valve ,boosting valve ,bleeder valve ,pump body and pipeline ,The control
air source and conveying air source can be the same ,of course it can be set
alone . The conveying pump is work to convey the coal powder , it have a high automatic
equipment whose process is controlled by PLC. The system mainly include feeding
equipment ,pneumatic bleeder valve ,pump ,gasification, pipelines and valves .
There are four stage during the bin pump conveying process :
Feeding
stage :
The
feeding valve will be opened when the bin pump running ,the material will fall
of into the bin pump by gravity . When the level gage send a signal of full or reach to the setting time , the
feeding valve will be closed automatically . During this stage ,level gage
works as main control component ,feeding time works as auxiliary method . If
the material reach to the level or setting time ,the feeding valve will be
closed automatically . The pneumatic ceramic lined rotating gate valve and pneumatic
ceramic lined double disc valve can be installed at this stage .
Fluidization & boosting pressure stage :
When the boosting valve opened ,compressed air will be
input from the bottom of pump body , then diffusion into fluidized
bed .At that time ,material turn into the fluid and the pressure in the
pump increasing gradually. The main valve in this stage include :ceramic ball
valve ,ceramic double disc gate valve .
Conveying
stage :
When
the valve in the pump arrive at the setting value , pressure sensor will send a
signal ,and blow off valve open . After several
second ,bleeder valve will be opened automatically . Material in the fluidized
bed have already turn into fluid ,material conveying started ,so the material
in the pump will be reduced gradually . At this stage ,the material is in the
stage of fluidizing and conveying . The main valve in this stage included ceramic lined double
gate valve ,pneumatic ceramic lined rotating gate valve .
Blowing
stage :
When
the material in the pump fully conveying ,pressure decreased into the
resistance of pipe ,the boosting valve and
blow off valve
closed ,bleeder valve will closed too after a while . This is a completed
working cycle .
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