A Coking Circulating Ammonia Water Self-Cleaning Parallel Heat Extraction Device and Its Operation Control Method

Abstract

The invention provides a coking circulating ammonia water self-cleaning and parallel heat absorption device and an operation control method thereof. The device comprises a first heat absorption exchanger, a second heat absorption exchanger, a third heat absorption exchanger, a circulating ammonia water pump, a softened water pump, a sewage collection tank, a sewage pump and a central controller. Compared with the prior art, the parallel heat absorption device has the effects that the parallel mode of double heat absorption exchangers is adopted for heat absorption exchange, so that the heat absorption exchange efficiency is high; meanwhile, a standby heat absorption exchanger is arranged, and the heat exchange stability of the device can be improved; in the procedure of coking circulatingammonia water heat absorption, intelligent detection and judgment on blockage of the heat absorption exchangers can be achieved; and the high efficiency cleaning of the heat absorption exchangers canbe achieved, so that the long-time automatic operation of the device is achieved.

Description

technical field [0001] The invention relates to a coking circulating ammonia water self-cleaning parallel heat extraction device and an operation control method thereof. Background technique [0002] The 80~85°C circulating ammonia water produced in the coking process contains huge energy. Taking a 1.2 million ton coking plant as an example, the circulating ammonia water is generally 100~1200m³ / h. With a temperature difference of 10°C, 11 million kcal / h can be obtained. heat. At the same time, in the coking production process, the temperature of each medium needs to be raised and lowered frequently, and medium-temperature water and low-temperature chilled water are required as heat exchange media. In the existing coking process, on the one hand, a large amount of waste heat is not used, and on the other hand, a large amount of energy medium needs to be consumed, which is not in line with the development direction of energy saving, emission reduction, low carbon and green de...

AI Technical Summary

Problems solved by technology

This patent uses conventional backwashing technology, ignoring the viscous characteristics of tar precipitates, and backwashing with circulating ammonia water at the same temperature cannot achieve the effect

At the same time, when multiple heat exchangers are connected in parallel, the dirty blockage of one of them will cause water imbalance, increase the flow of ammonia water in other heat exchangers, and also increase the pressure difference between front and rear

Therefore, the use of pressure difference to judge whether it is dirty or blocked, and the use of circulating ammonia water backwashing technology are not suitable for the waste heat recovery device of circulating ammonia water in coking plants

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