Asymmetrically-arranged heat exchanger

Abstract

The invention provides an asymmetrically-arranged heat exchanger. The heat exchanger comprises a collecting pipe, left coil pipes and right coil pipes are distributed on the left side and the right side of the collecting pipe respectively; the heat exchanger is characterized in that the left coil pipes and the right coil pipes are arranged at intervals, one right coil pipe is arranged between every two adjacent left coil pipes, and one left coil pipe is arranged between every two adjacent right coil pipes. The heat exchanger can be used for carrying out reinforcing heat exchange and soot removal at different heights, and the effects of reinforcing heat exchange and removing accumulated dust are achieved.

Description

technical field [0001] The invention belongs to the technical fields of heat exchange technology and flue gas desulfurization, and in particular relates to an asymmetrically arranged heat exchanger and a flue gas waste heat utilization system thereof. Background technique [0002] my country is the world's largest coal producer and consumer. Coal-fired power plants consume a lot of coal to provide steam and electricity, but also emit a lot of waste heat. Flue gas waste heat recovery generally adopts shell-and-tube heat exchangers, so the enhanced heat transfer technology of heat exchangers is of great significance to energy saving and consumption reduction. Among them, passive enhanced heat transfer technology has become an important research direction because it does not require external high-quality energy input to achieve the purpose of enhanced heat transfer. [0003] The use of fluid-induced vibration of heat transfer elements to achieve enhanced heat transfer is a for...

AI Technical Summary

Problems solved by technology

Flue gas desulfurization is to reduce flue gas SO 2 One of the effective technologies for emissions, including wet, dry, and semi-dry desulfurization technologies, among which wet desulfurization, especially limestone / gypsum wet desulfurization, is the most widely used, but this method has large water consumption, difficult wastewater treatment, and large investment and other problems, and most of the desulfurization by-product gypsum is idle and stacked, which not only occupies land resources but also causes secondary pollution; while the dry and semi-dry desulfurization processes are simple, but there are high Ca / S ratios, low desulfurization efficiency, desulfurization agent regeneration and replacement Higher costs and other issues, so finding alternative environmentally friendly desulfurizers has become an important issue to be solved urgently

[0005] Ionic liquids are a class of organic molten salts composed of anions and cations that are liquid at or near room temperature. They have extremely low volatility, wide electrochemical windows, and good selective dissolution or absorption / attachment properties. Studies have shown that the effect of ionic liquid on SO 2 With good selective dissolution, absorption / adsorption, the advantage of ionic liquid desulfurization technology is that it can remove SO economically and efficiently without secondary pollution 2 , and turn it into a usable chemical raw material, and the absorbent can be regenerated and recycled. However, due to the inherent high viscosity of the ionic liquid and the large gas mass transfer resistance, it is used as an absorbent in gas-liquid separation. Unfavorable, it causes the carrying loss of the ionic liquid. At the same time, for the desorption and regeneration of the ionic liquid desulfurizer, an additional heat source is required to provide energy, which also increases the desulfurization operation cost to a certain extent.

Images