分子筛脱水装置再生加热系统技术对比分析

目的 确定直接式电加热器、盘管式铸铝电加热器、燃气导热油炉、电加热导热油炉4种分子筛再生加热系统的技术和经济适用性，为选择最优的再生加热系统提供技术参考。方法 对再生加热系统的设备结构、常见故障、技术要点进行了介绍，从适用工况、安全性能、设备投资、优缺点等方面进行了技术对比分析。结果 直接式电加热器的建议热负荷在300 kW以内，同时应配备完善的多维度多点控制保护措施；盘管式铸铝电加热器建议使用在高压、腐蚀性、有毒介质等特殊工况，单台热负荷在200 kW以内；电加热导热油炉系统易于实现小型化、标准化、模块化，建议热负荷为150～400 kW;燃气导热油炉系统在热负荷大、多点用热和双温位用热等工况下建议选用。结论 分子筛脱水装置应在设计条件下进行技术经济对比后选择合适的再生加热方式。

Regenerating heating system technical comparative analysis in molecular sieve dehydration unit

ObjectiveThe technical and economic applicability of four molecular sieve regeneration systems, methods which are direct electric heater, coil cast-in aluminum electric heater, gas-fired heat conduction oil furnace, and electric heat conduction oil furnace, were determined to provide technical reference for selecting the optimal regenerative heating systems. Methods The equipment structure, common faults and technical concerns of the four regeneration heating systems were introduced, and the technical comparative analysis was carried out from the aspects of applicable conditions, safety performance, equipment investment, advantages and disadvantages, etc. ResultsIt is recommended that the heat load of the direct electric heater should be within 300 kW, and it should be equipped with perfect multi-dimensional multi-point control and protection measures; Coil cast-in aluminum electric heater was recommended to be used in high pressure, corrosive, toxic media and other special working conditions with heat load within 200 kW; The electric heat conduction oil furnace is easy to realize miniaturization, standardization and modularization, and the recommended heat load is 150-400 kW. Gas-fired heat conduction oil furnace was recommended to used under the conditions of large heat load, multi-point heat and double temperature position heat. ConclusionsThe suitable regenerative heating method should be selected after technical and economic comparison under the design condition of molecular sieve dehydration device.