Analysis of the reasons for high compressor exhaust temperature----Hörligk

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􀩦􀤑􀜌􀧃􀀩􀿟􀨱􀀪􁎌􁈢􀧛􁂊 Document Number: Tech. Argument _006 Analysis of the reasons for high exhaust temperature Dear customer: Thank you for using Holbig’s valve products! In our daily work, we often receive complaints from customers about high compressor exhaust temperatures. There are many factors that affect exhaust temperature, and it is not entirely a problem with the valves. To assist you in analyzing the issue, we have systematically summarized the causes of elevated compressor exhaust temperature: 1. Change in medium: It is common for the exhaust temperature to rise due to changes in the composition of the compressing medium; for example, testing a hydrogen compressor with nitrogen, or testing a CNG compressor with air, and so on. 2. Rising inlet temperature: 􀂙 As the ambient temperature increases, the inlet temperature is relatively high in summer. 􀂙 Low cooling efficiency of the cooler (for water-cooled systems, this can be diagnosed by checking the temperature difference between the inlet and outlet cooling water; either an excessively large or small temperature difference indicates a problem): 􀁺 Insufficient amount of cooling water. 􀁺 The cooling water pipes are partially blocked due to scale. 􀁺 The cooling water pipes have been rearranged, and there are unreasonable aspects in this arrangement. 􀂙 The bypass valve is not fully closed. 􀂙 There is a leak in the suction valve. 3. Low suction pressure increases the compression ratio of the compressor, leading to an increase in exhaust temperature: 􀂙 Excessive resistance in the suction line (check the pipeline fittings, valves, etc.). 􀂙 The compressor displacement increases (the compressor’s displacement can be reduced by adjusting the air volume). 􀂙 The gas is cooled excessively in the previous cooler, resulting in an increased intake volume at this stage. (Available adjustable cooling water flow) 􀂙 Leak in the suction pipeline (pipe connections can be checked) 􀂙 Reduced air supply or lower-level air supply volume (the air source can be checked). 4. Increased exhaust pressure and a higher compression ratio lead to an increase in exhaust temperature: 􀂙 Reduced suction volume at the next stage or reduced air consumption downstream. 􀂙 Leakage in the lower-level intake valve (check and replace). 􀂙 Insufficient cooling by the pre-cooler leads to an increase in inlet temperature. (Increase cooling water flow, clean the pipes.) 􀂙 Excessive resistance in the exhaust pipeline. (It is possible to check the pipelines, valves, etc.) 􀂙 There is a problem with the design of the exhaust valve, resulting in increased resistance at the valve. 5. Exhaust valve leakage 6. Wear of piston rings, resulting in an increased gap between the piston and the cylinder liner. Misconception: Can temperature instruments accurately reflect the actual conditions?