Novel energy-saving distillation technology of heat pump

Abstract

The invention provides a novel energy-saving distillation technology of a heat pump, aiming at reducing the device energy consumption of distillation of the heat pump and simplifying the process. The technology comprises the following steps: A. conveying a kettle solution at the bottom of a distillation column to a flash column, and performing flashing in the flash column; B. introducing flashing steam generated by flashing into a compressor, and carrying out compression on the flashing steam for acting by the compressor; C. introducing steam output by the compressor to the bottom in the distillation column, forming rising steam required for distillation by the steam output by the compressor and a vaporized kettle solution, and transferring mass and heat between the rising steam and a liquid declining from the upper part of the distillation column in a backflow mode to complete the distillation process; exchanging heat between partial kettle solution subjected to flashing with steam discharged from the top of the distillation column, and returning to the flash column after recycling heat of the steam; and exchanging heat of the residual kettle solution subjected to flashing with a material liquid entering the distillation column, and carrying out water cooling and recycling after recycling the heat of the kettle solution. The novel distillation technology provided by the invention is simple in technological process, low in investment and high in energy saving efficiency, and can save more than 70% of energy compared with a traditional distillation method.

Description

technical field [0001] The invention relates to the technical field of heat pump distillation, in particular to a new energy-saving process of heat pump distillation. Background technique [0002] The chemical industry is a large energy consumer, and distillation is a unit operation with extremely high energy consumption. However, the traditional distillation method has low thermodynamic efficiency and a lot of energy waste. For example, in the document "Application of Kangshifu Renewable Amine Desulfurization Technology" ("Sulfuric Acid Industry", 2007(1): 39-45), SO is separated from the desulfurization absorption liquid by distillation 2 , each ton of desulfurization liquid needs to consume 0.1-0.2t0.6MPa saturated water vapor; The ammonia in the ammonia water is separated by distillation, and the remaining ammonia water needs to consume -175Kg0.6MPa saturated water vapor per ton; "Analysis of Energy Consumption of Desulfurization Devices in Natural Gas Purification Plan...

AI Technical Summary

Problems solved by technology

[0005] 1. High investment, complex process flow, high-concentration toxic and harmful media are directly compressed by compressors, the compressors are severely corroded or require high material grades, and insufficient heat recovery;

[0006] 2. The compressed gas contains non-condensable gas, which leads to low heat transfer efficiency of the reboiler, high operating pressure of the reboiler, and easy corrosion;

The overhead gas of this process contains a high concentration of SO 2 , severe corrosion, or high requirements on material grades and complex processes

[0009] 2010101232510, titled "Heat Pump Flash Steam Stripping and Removal of Ammonia", and 2012101536708, titled "A Treatment Method for High-Concentration Ammonia-Containing Wastewater Based on Vapor Compression", both of which require the use of a reboiler, the process The process is complicated, and there are still problems that the compressor is in contact with high-concentration ammonia gas, severe corrosion, or high material grade requirements

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