Heater for low-temperature ethylene unloading and working method thereof

Abstract

The invention aims to provide a heater for low-temperature ethylene unloading and a working method of the heater. The heater is characterized by comprising a shell pass cylinder, a supporting skirt, a methanol injection port, a drain outlet, a first seal head, an ethylene reinforced cylinder section, an ethylene side pipe box, a first heat exchange pipe bundle, a second seal head, a steam reinforced cylinder section, a steam side pipe box, a second heat exchange pipe bundle, a first detection instrument, a safety valve port, an emptying interface, a liquid level detection interface and a second detection instrument, a detection instrument and a man hole; the ethylene side pipe box is provided with an ethylene injection port and an ethylene outlet, and the steam side pipe box is provided with a steam injection port and a condensate outlet. The whole set of device adopts a double-heat-exchanger structural design, the medium of one group of heat exchange pipe bundles is low-temperature ethylene, the medium of the other group of heat exchange pipe bundles is water vapor, the medium in the cylinder is methanol, and the steam and the low-temperature ethylene exchange heat indirectly, so that the purpose of rising the temperature of the ethylene is achieved. The heater is compact in overall structure, good in heat transfer effect, is energy-saving and environment-friendly, is low in cost, and is safe and reliable.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a heater for unloading low-temperature ethylene and a working method thereof. Background technique [0002] In industrial production, the ethylene industry is the core of the petrochemical industry and occupies an important position in the national economy. The world regards ethylene products as one of the important symbols to measure a country's petrochemical production level. The first China Refining and Chemical Integration Symposium in China discussed the "13th Five-Year Plan" to promote the trend of refining and chemical integration industry; domestic oil products, olefins and aromatics market prospects in China and the world are already under construction; domestic refining and chemical integration projects in the future Planning, discussing the combination of naphtha cracking and MTO; the market potential and rational planning of key petrochemical products; the low-cost hy...

AI Technical Summary

Problems solved by technology

The first China Refining and Chemical Integration Symposium in China discussed the "13th Five-Year Plan" to promote the trend of refining and chemical integration industry; domestic oil products, olefins and aromatics market prospects in China and the world are already under construction; domestic refining and chemical integration projects in the future Planning, discussing the combination of naphtha cracking and MTO; the market potential and rational planning of key petrochemical products; the low-cost hydrogen production scheme of refining and chemical integration; the safety and environmental protection issues of refining and chemical integration; Integrated million-ton ethylene project design, the demand for ethylene is huge, and the focus is on the storage of ethylene. In order to reduce the project’s investment in ethylene storage, large enterprises give priority to storing ethylene after heating up. The ethylene storage tank is changed from the original All stainless steel storage tanks are changed to low-temperature steel; in the low-temperature storage of ethylene in large million-ton-level olefins or aromatics projects per year, the company has the risk of increasing operating costs due to storage costs, especially in low-temperature ethylene unloading. During the process, the low-temperature ethylene is directly output and stored, which will cause great damage to the storage equipment. Under the influence of low temperature, the storage equipment is prone to rapid freezing, and the storage container or storage cylinder is prone to cracking. , which seriously threatens the safety of the equipment; therefore, it is necessary to design a heat exchange equipment to heat up the temperature of low-temperature ethylene, thereby reducing the safety risk of the storage equipment, and solving and avoiding the problems and disadvantages in the above operation process

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