Production process for preparing sulfur by recovering sulfur dioxide from flue gas

A sulfur dioxide and production process technology, applied in the field of flue gas purification, can solve the problems of high desorption steam consumption, easy blockage of heat exchangers, poor desulfurization effect, etc., and achieve the effects of low system resistance, good economic benefits, and simple operation

Active Publication Date: 2014-06-25
CHENGDU HUAXITANG INVESTMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the equipment used is made of special materials, and the investment is high; when the desorption effect is poor, the desulfurization effect is poor; the steam consumption of desorption is high; clogged heat exchanger

Method used

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  • Production process for preparing sulfur by recovering sulfur dioxide from flue gas

Examples

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Comparison scheme
Effect test

Embodiment 1

[0027] A production process for recovering sulfur dioxide from flue gas to produce sulfur, the specific steps are as follows:

[0028] A. The flue gas is desulfurized by sodium carbonate solution in the absorption tower, and the absorption liquid after interacting with the flue gas is concentrated and crystallized to separate the solid sodium salt;

[0029] B. Send the solid sodium salt into the reducer, and under the action of the reducing agent, the solid sodium salt is reduced to sodium sulfide; the molten mixture from the reducer is chilled, dissolved, filtered and washed, and the resulting clear liquid is an aqueous solution of sodium sulfide ; CO-rich exhaust from the reducer 2 After the gas is recovered by the waste heat boiler to generate steam, it is sent to the next step for processing;

[0030] C, add sodium bicarbonate in the gained sodium sulfide aqueous solution of B step, react gained H 2 The S gas is sent into the Claus furnace to manufacture sulfur products;...

Embodiment 2

[0032] A production process for recovering sulfur dioxide from flue gas to produce sulfur, the specific steps are as follows:

[0033] A. The flue gas is desulfurized by sodium bicarbonate solution in the absorption tower, and the absorption liquid after interacting with the flue gas is concentrated and crystallized to separate the solid sodium salt;

[0034] B. Send the solid sodium salt into the reducer, and under the action of the reducing agent, the solid sodium salt is reduced to sodium sulfide; the molten mixture from the reducer is chilled, dissolved, filtered and washed, and the resulting clear liquid is an aqueous solution of sodium sulfide ; CO-rich exhaust from the reducer 2 After the gas is recovered by the waste heat boiler to generate steam, it is sent to the next step for processing;

[0035] C, add sodium bicarbonate in the gained sodium sulfide aqueous solution of B step, react gained H 2 The S gas is sent into the Claus furnace to manufacture sulfur product...

Embodiment 3

[0037] The implementation mode of this embodiment is basically the same as embodiment 1, on this basis:

[0038] The molten mixture from the reducer is chilled, dissolved, filtered and washed, and the solid waste obtained is sent to the boiler as fuel.

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Abstract

The invention provides a production process for preparing sulfur by recovering sulfur dioxide from flue gas. The production process comprises the following specific steps of: (A) carrying out desulfurization on the flue gas by sodium carbonate or sodium bicarbonate solution in an absorbing tower, concentrating and crystallizing absorbing solution after reacting with the flue gas, and separating out solid sodium salt; (B) feeding the solid sodium salt into a reducer, and under the action of a reducing agent, reducing the solid sodium salt into sodium sulfide; carrying out chilling, dissolving, filtering and washing on molten mixture from the reducer to obtain clean liquid which is aqueous solution of sodium sulfide; recovering the heat of gas with rich CO2 discharged by the reducer by a waste heat boiler to generate steam, and feeding the steam to next step for treatment; and (C) adding sodium bicarbonate into the aqueous solution of sodium sulfide obtained in the step (B), feeding H2S obtained by reaction into a claus furnace, and manufacturing a sulfur product; and feeding sodium carbonate solution obtained by reaction to react with the rich CO2 in the step (B), and obtaining sodium bicarbonate which can be recycled.

Description

technical field [0001] The invention relates to the technical field of flue gas purification, in particular to a production process for recovering sulfur dioxide from flue gas to prepare sulfur. Background technique [0002] In view of the long-term existence of my country's coal-based energy structure and the rapid development of industrialization in recent years, SOx and NOx have become the main air pollutants in my country, and have caused serious damage to the ecological environment in various forms such as acid rain and smog. , had a great negative impact on the entire national economic life. [0003] Flue gas desulfurization and denitrification are the most important measures for air pollution control. At present, there are many flue gas desulfurization technologies at home and abroad, such as limestone-gypsum method, ammonia method, double alkali method, and rotary spray method. Problems such as blockage, difficult disposal of desulfurization by-products, and secondar...

Claims

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Application Information

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IPC IPC(8): C01B17/04
CPCY02P20/10Y02P20/129
Inventor 任毅李东林郎治
Owner CHENGDU HUAXITANG INVESTMENT
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