Process device and method for removing heavy hydrocarbon in natural gas by adopting LPG (Liquefied Petroleum Gas)

Abstract

The invention discloses a process device and a process method for removing heavy hydrocarbon in natural gas by adopting LPG (Liquefied Petroleum Gas) in a natural gas liquefying process. The process device comprises a heavy hydrocarbon washing tower, a deethanization tower and a debutanization tower, wherein the heavy hydrocarbon washing tower is connected with a throttle valve, a cooler, the deethanization tower and the debutanization tower in sequence; the top outlet of the debutanization tower is connected with a debutanization tower condenser, a debutanization tower reflux tank, a debutanization tower reflux pump and a debutanization tower upper inlet in sequence; and the debutanization tower reflux tank is connected with an upper inlet of the heavy hydrocarbon washing tower by an LPG booster pump. The process device and the process method for removing heavy hydrocarbon in natural gas by adopting LPG have the positive effects that the LPG products produced in the device are utilized to wash, and the LPG product source is stable and reliable; the heavy hydrocarbon removing effect is good, so that the heavy hydrocarbon components in the natural gas are removed as much as possible for facilitating a liquefying process and effectively preventing the heavy hydrocarbon from being frozen and blocked; and the heavy hydrocarbon removing process by adopting the LPG is simple, so that the deep pre-treatment needs of the natural gas liquefaction can be achieved by absorbing and transferring mass, and therefore, the natural gas liquefaction needs are satisfied.

Description

technical field [0001] The invention relates to a process device and method for removing heavy hydrocarbons in natural gas by using LPG in the natural gas liquefaction process, in particular to the device and method for removing heavy hydrocarbons in the large-scale natural gas liquefaction process. Background technique [0002] Natural gas must undergo advanced pretreatment before liquefaction, including the removal of heavy hydrocarbon components, so as to effectively avoid the freezing and blocking caused by impurities in the natural gas liquefaction process, especially the condensation and freezing of heavy hydrocarbon components in low-temperature environments. Blockage of pipes, valves and plate-fin heat exchangers and other equipment. At present, the methods for removing heavy hydrocarbons from natural gas at home and abroad mainly include rectification and adsorption. When the adsorption method is used to remove heavy hydrocarbons in natural gas, its removal perform...

AI Technical Summary

Problems solved by technology

The disadvantages of the above two processes for removing heavy hydrocarbons from natural gas containing heavy hydrocarbons are large investment, high energy consumption, many equipments required, and complicated processes, which are not conducive to energy saving and consumption reduction

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