System for recycling waste heat produced by methyl-diethanolamine (MDEA) decarburization process by using ultra high temperature heat pump

Abstract

The invention discloses a system for recycling waste heat produced by a methyl-diethanolamine (MDEA) decarburization process by using an ultra high temperature heat pump. The system mainly comprises two procedures of MDEA decarburization and ultra high temperature heat pump working media. In the system, an evaporator of an ultra high temperature heat pump unit replaces original cooling water to decrease the temperature of a barren solution of the decarburization process to a required temperature, and the cooled barren solution absorbs CO2 of process gases; and a condenser of the ultra high temperature heat pump unit replaces original high temperature vapor. According to the system for recycling the waste heat produced by the MDEA decarburization process by using the ultra high temperature heat pump, by means of an ultra high temperature heat pump technology, technical bottlenecks of temperature limitation of original high temperature heat pumps are broken through, and recycling ranges of low temperature waste heat are greatly expanded. The ultra high temperature blending working media are used, and the waste heat produced by the MDEA decarburization process is utilized so that energy qualities are improved to meet requirements of high temperature heat required when an MDEA decarburization solution is regenerated. By means of the system, energy utilization ratios of the process are improved, and good energy-saving and economical effects are achieved.

Description

technical field [0001] The invention belongs to the technical field of heat pumps and decarbonization chemical processes, and in particular relates to a technology and a device for combined utilization of ultra-high temperature heat pumps and MDEA decarbonization processes. Background technique [0002] The energy consumption of synthetic ammonia accounts for 40% of the total chemical industry, and it is one of the five high-energy-consuming industries in my country's chemical industry. In the production of synthetic ammonia, the energy consumption of the decarbonization process is about 10% to 15% of the total energy consumption. Therefore, there is a lot of room for energy saving in the decarbonization process. Activated MDEA decarburization is a technology developed and industrialized by BASF abroad in the 1970s. This decarbonization process technology has high purification degree, simultaneous desulfurization and decarbonization, less loss of nitrogen and hydrogen, and...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems existing in the prior art, the present invention provides a system that uses an ultra-high temperature heat pump to recover and utilize the waste heat of the MDEA decarbonization process, so as to solve the problem that the low-grade waste heat in the MDEA decarbonization process cannot be utilized and consumes a large amount of primary energy Waste of resources to generate steam for heating MDEA solution

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