Device for preparing liquid sulfur dioxide from high-temperature sulfur-containing waste gas

Abstract

The invention discloses a device for preparing liquid sulfur dioxide from high-temperature sulfur-containing waste gas. The device comprises a filter (1), a reboiler (2), a phase-change condenser (3), an absorption tower (4), a lean / rich liquor heat exchanger (7), a desorption tower (8), a dryer (9), a gasification condenser (10), a compressor (11) and a liquid sulfur dioxide storage tank (12). The device has the advantage that high-temperature properties of the sulfur-containing waste gas are sufficiently utilized, and material flow connection sequences are adjusted, so that the purpose of optimally configuring energy can be achieved; abundant water vapor in the waste gas is preliminarily removed, 'primary thickening' and 'secondary absorbing' modes are adopted for sulfur dioxide, accordingly, the sizes of equipment can be effectively reduced, the mass transfer efficiency can be improved, and the purposes of saving energy and reducing consumption can be achieved; public resources and existing technologies are sufficiently utilized, so that the comprehensive efficiency of systems can be improved.

Description

technical field [0001] The invention belongs to the field of environmental protection and chemical engineering, relates to the utilization of industrial waste gas with high added value, and is especially suitable for the field of preparing liquid sulfur dioxide from high-temperature sulfur-containing waste gas. Background technique [0002] Sulfur dioxide is the main air pollutant. Adsorbent dry desulfurization, such as activated coke desulfurization, is an important means of removing sulfur dioxide. In order to control costs, adsorbents usually need to be regenerated and recycled, and high-temperature desorption is a common regeneration method for adsorbents. The industry generally uses nitrogen as the carrier gas during thermal regeneration. Because the concentration of sulfur dioxide in the generated desorption gas is low, it is often used to prepare dilute sulfuric acid. However, due to the narrow application range of dilute sulfuric acid products, its added value as a ...

AI Technical Summary

Problems solved by technology

This method does not recover and utilize the energy of the flue gas, so it is usually suitable for treating waste gas with low thermal energy grade

At the same time, the content of sulfur dioxide in flue gas treated by traditional absorption methods is generally low, resulting in bulky desulfurization equipment, large amount of desulfurization agent and high loss, which increases the total energy consumption of the system and further increases the cost of the product

Images