Method for preparing sulfur dioxide by utilizing by-product of coking industry desulfurization system

Abstract

The invention discloses a method for preparing sulfur dioxide by utilizing the by-product of a coking industry desulfurization system, and relates to the technical field of sulfur dioxide production methods. According to the method, liquid-state sulfur from a sulfur melting system passes through a liquid-state sulfur conveying pipeline, and is subjected to flow rate adjusting through a liquid-state sulfur flow rate control device, and the flow rate-adjusted liquid-state sulfur enters an incinerator through a liquid-state sulfur inlet; a liquid-state by-product salt from a salt extraction system passes through a liquid-state by-product salt conveying pipeline, and is subjected to flow rate adjusting through a liquid-state by-product salt flow rate control device, and the flow rate-adjustedliquid-state by-product salt enters the incinerator through a liquid-state by-product salt inlet; external oxygen is subjected to flow rate adjusting through an oxygen flow rate control device, and the flow rate-adjusted external oxygen enters the incinerator through an oxygen inlet; and the liquid-state sulfur, the liquid-state by-product salt and the external oxygen are subjected to a combustionreaction at a certain temperature in the incinerator, and the generated sulfur dioxide gas is exported through a generated gas outlet. According to the present invention, with the application of themethod to prepare sulfur dioxide, the reactant liquid-state sulfur does not substantially contain water, and the water content of the liquid-state by-product salt is low, such that the generated sulfur dioxide gas has the low water content, and a large amount of dilute sulfuric acid cannot be generated in the acid preparation process of the subsequent system so as to solve the disadvantage of theexisting desulfurization waste liquid-to-acid process.

Description

Technical field: [0001] The invention relates to a method for preparing sulfur dioxide by using a by-product of a desulfurization system in the coking industry, and belongs to the technical field of sulfur dioxide production methods. Background technique: [0002] A large amount of sulfur foam will be formed in the wet desulfurization process used in the coking industry. At the same time, there will be side reactions during the desulfurization reaction, and ammonium thiocyanate and ammonium thiosulfate will be generated, which are called secondary salts. The components of sulfur foam Mainly include: water, sulfur particles and auxiliary salts such as ammonium thiocyanate and ammonium thiosulfate. The secondary salt generated by the side reaction accumulates in the desulfurization liquid, and when the concentration reaches a certain amount, it will affect the desulfurization reaction. Therefore, the secondary salt generated by the side reaction - ammonium thiocyanate and ammo...

AI Technical Summary

Problems solved by technology

This process has the following disadvantages: one is that the drying system is huge and the investment is high; the other is that the sulfur foam contains about 90% of water, and it needs to consume a lot of energy to dry it, so the energy consumption is high; What is used is dry powder, so some dry powder that is not completely burned will be taken out of the incinerator and enter the subsequent waste heat recovery system, causing the waste heat recovery system to be blocked

This process has the following deficiencies: one is that the sulfur paste has a relatively large water content, which will absorb a large amount of heat to generate water vapor during the incineration process, resulting in a decrease in the temperature of the incinerator and making it difficult to control the furnace temperature; the other is that the water generated during the incineration process After the steam reaches the system, a large amount of dilute sulfuric acid will be generated. The acid production process cannot consume so much dilute sulfuric acid, resulting in excess dilute sulfuric acid that cannot be processed, and the pressure on environmental protection is relatively high.

Due to the above-mentioned deficiencies in this process, this process cannot achieve long-term continuous production

[0006] Because the existing two processes have unsolvable problems, they have not been popularized. Coking enterprises use the by-product sulfur and side salt of the desulfurization system to produce sulfur dioxide for the production of sulfuric acid and expect a new process.

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