A direct contact heat exchanger with preheating system

Abstract

The invention discloses a direct contact heat exchanger with a preheating system, which includes a heat transfer oil heating tank, a composite evaporator and a heat transfer oil preheating tank connected sequentially from top to bottom, and the side walls of the heat transfer oil are connected with different grades. The flue gas inlet, the heat transfer oil heating tank and the heat transfer oil preheating tank are connected with an ORC direct contact-partition wall coupling circulation system, and the heat transfer oil heating tank and the compound evaporator are connected with a working medium circulation system. Compared with the prior art, the present invention is equipped with a heating tank, a composite evaporator, and a heat transfer oil preheating tank, and the built-in spiral tube increases the heat exchange surface area of ​​the flue gas, prolongs the heat exchange time, and improves the heat exchange efficiency; Preheating shortens the heating time and improves the utilization rate of waste heat; the working fluid circulation system effectively utilizes the waste heat of the flue gas, and the existence of heat transfer oil heating the tank body overheats the steam at the outlet of the evaporator, effectively avoiding the organic working fluid in the evaporator Convection with the heat transfer oil reduces the pressure loss of the working fluid and reduces the retention rate of the working fluid.

Description

technical field [0001] The invention relates to the technical field of recovery and utilization of metallurgical low-temperature waste heat, in particular to a direct contact heat exchanger with a preheating system. Background technique [0002] Waste heat resources in my country's industrial field account for about 17% to 67% of its total fuel consumption. my country has made significant progress in the utilization of waste heat resources, especially in the use of high-temperature and medium-temperature waste heat resources; but compared with other developed countries, there is still a gap There are many deficiencies, the utilization rate of waste heat is relatively low, and the utilization rate of waste heat in large iron and steel enterprises is about 30% to 50%. The subject of our further research. [0003] At present, the heat exchange equipment is mainly based on the partition wall heat exchanger, but the partition wall surface of the partition wall heat exchanger leads...

AI Technical Summary

Problems solved by technology

[0004] However, there are still problems of short heat exchange time and low heat exchange efficiency. At the same time, the heat transfer medium is in contact with each other, which is prone to phase change and affects the heat exchange effect.

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