The compressors commonly used in equipment selection natural gas transmission pipelines are mainly centrifugal and reciprocating. The gas transmission volume of Jingxi gas pipeline is small (gas/a after supercharging), the flow variation range is large, and the power required for boosting each gas station is small. Centrifugal compressors have large investment, long overhaul period, strict operation and management requirements for daily operation, and long lead times. In order to save investment, adapt to changes in flow and shorten the construction period, high-efficiency gas engine-reciprocating compressor unit pressurization should be adopted.
Since the natural gas compressor has very strict requirements on the cleanliness of the gas, the design uses the original equipment at each gas pressure station to perform the preliminary separation of the cyclone dust separation of the unit intake air; the high-efficiency filter separator is added to finely separate the raw material natural gas. In addition, the compressor unit is required to be equipped with an inlet and outlet buffer tank to ensure the cleanliness of the compressor inlet and outlet gas. The engine oil system capacity is 646L, the engine fuel consumption rate is 0426kg/kWh, the annual fuel consumption is about 2170L, and the cooling system capacity is 80642. The actual operation result is October 2001. The Jingbian pressure station has three compressor units (A, B, C). Trial operation, complete single-machine 72h continuous operation with load and dual-machine intermodal transportation.
Single machine 72h operation related parameters and parallel operation related parameters operating conditions unit speed, intake pressure, exhaust pressure, displacement, fuel gas, maximum speed average speed unit intake pressure, exhaust pressure, displacement, in During the whole trial operation, the compressor unit operated smoothly. According to the test operation results, all the indexes of the three compressor units met the design requirements.
Design Considerations for the Supercharger Station Through the design, construction and commissioning of the Jingxi gas pipeline booster station, the author believes that the design of the booster station should pay attention to the following problems: a) The compressor inlet should have high efficiency dust filtration. Separation equipment; at the same time, in order to prevent the compressor inlet pipeline from being cleaned uncleanly, a temporary filter is installed at the gas inlet to ensure the inlet gas is clean; b) the gas engine start gas and the fuel gas can be combined with one pipeline to start the gas. The consumption is the design of the pressure regulator; c) the compressor unit should be equipped with anti-vibration measures, the compressor unit itself should be equipped with an inlet and outlet buffer tank, the inlet and outlet pipelines should have the necessary shock absorption facilities; d) the compressor unit should be air-cooled The power supply mode of the device considers whether a standby generator set is required; e) the booster station should be equipped with a lubricating oil recovery system; f) the compressor unit should have an automatic protection system in case of emergency; g) the compressor plant should ensure good ventilation, and should adopt half Open factory buildings or open workshops may be determined according to actual conditions; h) installation of compressor inlet and outlet pipelines shall be considered for ease of start-up and maintenance; i) gas
In the natural gas long-distance pipeline, the pressure of the gas in the gas pipeline will gradually decrease from the first station to the last station. In order to meet the requirements of the pipeline transportation process and the user's natural gas pressure, the natural gas must be supercharged several times, and the designed supercharger station It will play an increasingly important role in natural gas long-distance pipelines.
China's ethylene cracking furnace co-development and localization achieved results Sinopec Group Company and US Lums Company developed a 1010t / a large ethylene cracking furnace, named SL cracking furnace, which is currently the largest single-furnace production capacity of ethylene cracking furnace in China Among them, 10 sets of 1010 furnaces have been completed and put into production in the second round of Sinopec ethylene expansion and expansion, and another 11 large furnaces are being designed. The two companies are also working together to develop a new cracking furnace with a single furnace capacity of 1510 t/a or more.
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