Heat utilization device for urea intermediate-pressure production system

Abstract

The invention relates to a heat utilization device, in particular to a heat utilization device for a urea intermediate-pressure production system, which not only can fully utilize a great amount of low-temperature heat produced by the intermediate-pressure cooling and heat exchange in a urea system, but also can produce low-temperature cold water to be used as a heat exchange medium of a post cooling system of an ammonia synthesis tower to increase ammonia cooling efficiency. In the invention, a separation tower gas phase outlet of the urea intermediate-pressure system, which is connected with a falling film type flash steaming heat utilizer, and the falling film type flash steaming heat utilizer is connected with a shell side of an intermediate-pressure heat exchanger and an absorption tower in sequence; a hot water outlet on a tube side of the intermediate-pressure heat exchanger is connected with a tube side of a generator of a water cooling set and a cold water inlet on the tube side of the intermediate-pressure heat exchanger in sequence; a synthetic cycle water cooler is connected with the tube side of a synthetic water cooler and a synthesis cold exchanger in sequence; and a hot water outlet on the tube side of the synthetic water cooler is connected with an evaporator tube side of the water cooling set and a cold water inlet on the tube side of the synthetic water cooler in sequence. The invention has the advantages of simple structure, energy saving, consumption reduction and high ammonia cooling efficiency.

Description

technical field [0001] The invention belongs to a heat energy utilization device, in particular to a device that can not only make full use of a large amount of low-temperature heat energy generated by medium-pressure cooling heat exchange in a urea system, but also generate very low-temperature cold water as a heat exchange medium for the post-cooling system of an ammonia synthesis tower to improve ammonia cooling. High-efficiency urea medium-pressure production system thermal energy utilization device. Background technique [0002] At present, in the synthetic ammonia urea production system, there is a large amount of low-temperature heat that cannot be effectively recycled, and can only be lost to the atmosphere through the cooling tower using circulating water heat exchange, which not only causes a large amount of heat loss, but also has adverse effects on the air environment. influences. Contents of the invention [0003] The purpose of the present invention is to ov...

AI Technical Summary

Problems solved by technology

[0002] At present, in the synthetic ammonia urea production system, there is a large amount of low-temperature heat that cannot be effectively recycled, and can only be lost to the atmosphere through the cooling tower using circulating water heat exchange, which not only causes a large amount of heat loss, but also has adverse effects on the air environment. influences

Images