Reciprocating refrigeration compressor non-condensable gas accumulation detection and purge operation guide

Reciprocating refrigeration compressor non-condensable gas accumulation detection and purge operation guide

Non-condensable gas mainly includes air, nitrogen and decomposition gas; it accumulates in condenser, raises condensing pressure and reduces refrigeration system efficiency. When actual condensing pressure is higher than saturation pressure corresponding to cooling medium temperature by more than 0.07 MPa, non-condensable gas needs to be purged. Xiteliduo reciprocating compressor system is equipped with automatic non-condensable gas detector; continuous pressure deviation over 0.05 MPa triggers automatic purge suggestion. Small 4-cyl reciprocating refrigeration compressor system non-condensable gas mostly enters through shaft seal and valve packing during negative pressure operation. Medium 4-cyl reciprocating refrigeration compressor non-condensable gas may be introduced after maintenance; air remains inside pipeline after assembly without vacuuming. Large 4-cyl reciprocating refrigeration compressor system with multi-condenser layout has higher gas accumulation risk; non-condensable gas gathers at upper condenser chamber. Large 6-cyl reciprocating refrigeration compressor running with high compression ratio may generate refrigerant decomposition gas; such gas also belongs to non-condensable component. Many refrigeration teams perform blind purge without testing. Improper purge operation leads to refrigerant loss and increases operation cost by 34%. Single-unit two-stage refrigeration compressor non-condensable gas mainly accumulates in high-stage condenser; low-stage negative pressure zone is the main gas ingress point. Cascade unit high-stage reciprocating refrigeration compressor loop operates at higher pressure; non-condensable gas here will create more obvious condensing pressure rise.

FAQ

Q1: What pressure deviation indicates non-condensable gas accumulation in reciprocating compressor system? A1: When condensing pressure exceeds saturation pressure by more than 0.07 MPa. Q2: What deviation threshold triggers Xiteliduo automatic purge recommendation? A2: Sustained pressure deviation greater than 0.05 MPa. Q3: Where does non-condensable gas enter small 4-cyl reciprocating compressor system? A3: Air leaks in through shaft seal and packing under negative pressure condition. Q4: What is the source of non-condensable gas after medium 4-cyl compressor overhaul? A4: Air trapped inside pipelines due to incomplete vacuuming. Q5: Where does non-condensable gas tend to gather in large 4-cyl multi-condenser system? A5: It accumulates at the upper chamber of the condenser. Q6: What economic loss will blind purge without gas detection cause? A6: Refrigerant waste raises operating cost by 34%. Q7: Where does non-condensable gas mainly accumulate for single-unit two-stage compressor? A7: Non-condensable gas accumulates mainly inside high-stage condenser.