Motor power accounting for adiabatic compression N=11634FBp1V1K/(K-1) System Improvements Due to changes in the nature and process of the components of the transport medium, it is necessary to modify the system accordingly to be suitable for transporting new media. Increased dewatering capacity Low-pressure gas components are complex and often carry liquid. The reciprocating compressor can not compress the liquid phase, the medium is charged with liquid, which is easy to cause liquid hammer, and the lighter can damage the valve plate, and the heavy one can damage the cylinder block. In order to avoid this accident, a 3194m3 liquid removal tank was added to the compressor inlet pipe network to increase the dewatering capacity and protect the unit. The process interlocking process interlock is changed to automatically open and stop the compressor and interlock with the 3000m3 alkylation raw material storage tank. After the compressor is pumped to the low-pressure pipe network, the original process interlock is deactivated. In order to protect the low-pressure pipe network from being twitched and the compressor not being pressed, the process interlocking function is added at the compressor inlet and outlet according to the actual situation. When the inlet pressure is lower than 015 kPa or the outlet pressure is greater than 017 MPa, the compressor automatically stops. Operation after the transformation Since the system was commissioned in August 2000, it has been running smoothly, safely and reliably. The main operating parameters of the compressor. The economic analysis uses the alkylation feedstock compressor to recover low-pressure gas, which not only balances the excess gas in the whole plant, but also has a considerable economic benefit. According to the calculation, the operating cost of each alkylation feedstock compressor is 1717 yuan/h. According to the designed volumetric flow rate, the compressor can recover 384m3/set of gas per hour, calculated according to 2 yuan/m3, if 2 sets are simultaneously After using, deducting the cost of sports, it can create 1,500 yuan per hour. Indirect benefits of low-pressure gas recycling, saving a large amount of atomized steam consumed by venting and water replenishment water. It is estimated that this alone can save 1.14 million tons of steam per year and 400 tons of fresh water, equivalent to more than 800,000 yuan per year. At the same time, the amount of oily sewage entering the drainage workshop is reduced, and the downstream treatment cost is reduced. Social Benefits The commissioning of the compressor basically eliminated the use of the torch, reduced the amount of gas venting, reduced the pollution of smoke and noise, and produced good social and environmental benefits. Conclusions and recommendations The use of alkylation feedstock compressors to recover low-pressure gas is technically feasible and economically cost-effective. Its transformation and application have produced good overall benefits. Low-pressure gas often carries impurities such as catalyst dust compared with alkylated feed gas. It is recommended to add a set of filters at the compressor inlet to facilitate switching without stopping the machine.
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