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Datang Fuxin Coal-to-Gas Gasification Center: A-series units’ airtightness tests successfully completed Author/Source: Modern Coal Chemical Engineering Date: 2020-07-22 Views: 228 The airtightness tests for the A-series units were successfully completed. Recently, the pressure gasification A-series units, the shift cooling A-series units, and the phenol recovery A-series units carried out leak detection and pressure retention tests at the specified test pressures in accordance with the airtightness test requirements, which marks the successful completion of these tests for the A-series units at the gasification center. For this airtightness test, air was used as the gas source; after being compressed by the coal lock gas compressor, it entered the units of the Conversion Cooling A series, Pressurized Gasification A series, and Synthesis Center A series through the coal lock gas pipelines. The gasification center attaches great importance to this airtightness work. First, preparations were made in advance; the center’s airtightness plan was comprehensively upgraded in accordance with the implementation scheme that uses coal-lock gas compressors as the gas source, thereby further ensuring the progress of the airtightness work plan ； Second, arrange the workload among personnel reasonably to accelerate the pipeline purging and system sealing work for various units in Series A of the gasification center. Before starting the airtightness testing, all units in Series A of the vaporization center had completed the individual testing of mechanical equipment as required by the plan; the pipelines were purged, and the pipeline system was restored and sealed in accordance with design specifications. All construction records were complete, on-site inspections confirmed that everything was done, the airtightness testing equipment was ready, and the personnel were on standby – all conditions for conducting airtightness tests were met. At 14:00 on July 15, the coal-lock gas compressor started successfully and supplied gas to the system. As the system pressure rose to 0.5 MPa, the operators of each unit checked the sealing integrity of every flange in the units by spraying soapy water, in accordance with the airtightness requirements, to ensure that no \"blind spots\" were overlooked; any leaks detected were promptly addressed in collaboration with the maintenance staff. After the sealing check in the first phase was completed, the system pressure was increased further to 1.0 MPa, and the operators conducted another sealing check on all flange connections. This process was repeated until the system pressure reached 2.5 MPa, at which point the airtightness testing was fully completed.