Purging Procedure of Absorption Chiller

Purging Procedure of Absorption Chiller Points : purging procedure of absorption chiller, write down the purging procedure of absorption chiller with the help of neat sketch The purge system of an absorption system, is critical to ensuring efficient operation and long machine life. Even when machines Ware vacuum light or properly inhibited, all absorption chillers generated hydrogen and other non condensable gases in small quantities since these gases are present in sufficient volume to interfere with proper machines operation, they must be removed to protect the unit from internal corrosion, lithium bromide solution crystallization, and or a reduction in chiller capacity. Motor Less Purge System Operation During operation, non condensable tend to accumulate in the absorber section; operates at the lowest internal pressure. A slip stream of lithium bromide solution firm the solution pump discharge flows through educator, creating suction that draws non-condensable from the absorber. The none condensable are the “entrained by the solution flowing through the educator. The educator discharge solution and none-condensable into a separator in a purge chamber, where the condensable are separated from the solution. The non-condensable flow to storage tanks, while the solution returns to the absorber sump. Typically, most of the non-condensable gas is compose of hydrogen, which is automatically dissipated to the atmosphere through a heated palladium cell.

As non-condensable accumulate in the external storage tank they are isolated from the chiller and can not re-enter the machine (even during shutdown) these gases must periodically be exhausted (as required) from the storage tanks by a simple procedure preformed while the machine is running. Evacuation is performed by a unit-mounted vacuum pump that is connected to the purge evacuation valve.

Evacuation through the vacuum pump is necessary because the palladium cell will be damaged if wetted by the lithium bromide solution. There fore pressurizing the pure tank above atmospheric pressure with the lithium bromide solution is not permitted the .unit mounted vacuum pump can also be used during chiller maintenance or service to remove non condensable —directly from the machine.