Liquid ethylene storage tank, liquid ethylene storage and gasification system and liquid ethylene gasification method

Abstract

The invention relates to a liquid ethylene storage tank, a liquid ethylene storage and gasification system and a liquid ethylene gasification method. The liquid ethylene storage tank comprises an outer tank, an inner tank for storing liquid ethylene, a heat-insulating material, an input pipe for inputting the liquid ethylene to the inner tank, a conveying pump for pressurizing the liquid ethylene, a conveying pump well for outputting the pressurized liquid ethylene and an output pipe for conveying the liquid ethylene to use equipment, wherein an outer tank is a hollow flat-bottom arch-top closed container, the lower bottom surface of the outer tank is arranged on the ground or a base; the inner tank is arranged inside the outer tank, is a hollow cylindrical flat-bottom cup-shaped container, and is provided with an opened circular suspended ceiling connected with the arch top of the outer tank; the heat-insulating material is filled between the inner tank and the outer tank; the input pipe sequentially penetrates through the arch top of the outer tank, the heat-insulating material and the suspended ceiling of the inner tank and is communicated with the inner tank; the conveying pump well sequentially penetrates through the suspended ceiling of the inner tank, the heat-insulating material and the arch top of the outer tank and is communicated with the output pipe at the outer part of the outer tank; and the conveying pump is arranged below the liquid level in the conveying pump well.

Description

technical field [0001] The invention relates to the field of ethylene storage and transportation, in particular to a liquid ethylene storage tank, a liquid ethylene storage system, a liquid ethylene gasification system, and a liquid ethylene gasification method. Background technique [0002] Ethylene is one of the most important basic raw materials for the petrochemical industry. Since the 1950s, some countries with advanced petrochemical industry technology have successively developed hydrocarbon cracking technology, which has greatly promoted the development of the synthetic material industry. At present, general-purpose plastics such as polyethylene, polypropylene, and styrene produced from hydrocarbons have been found in every corner of daily life. With the continuous development of my country's petrochemical industry and national economy, the demand for ethylene continues to increase, and the production capacity of domestic ethylene plants can no longer meet the demand...

AI Technical Summary

Problems solved by technology

Because the volume of the cofferdam must be set at least as large as the volume of the liquid ethylene storage tank, and the height setting should not be too high according to the regulations of the fire department, so the cofferdam of the liquid ethylene storage tank usually occupies a very large area. In this way, the liquid ethylene output pipe between the liquid ethylene storage tank and the liquid ethylene transfer pump outside the cofferdam is relatively long, and the low-temperature liquid ethylene absorbs the heat of the environment along the output pipe from the storage tank to the transfer pump, which will generate a large amount of heat. Boil Off Gas (BOG, Boil Off Gas), it takes a lot of energy to convert these BOGs into liquid ethylene, or to compress them for output

Moreover, the existence of BOG in the liquid ethylene output pipe will cause cavitation of the delivery pump, cause vibration of the pump operation and damage the pump, resulting in economic losses and safety and environmental protection problems

Images