a high concentration so 2 conversion acid production process

A SO2, high-concentration technology, applied in inorganic chemistry, sulfur compounds, chemical instruments and methods, etc., can solve the problems of acid conversion, large size of dry suction equipment, limiting the comprehensive economic benefits of oxygen-enriched smelting, etc., and achieves low complexity. , the effect of simple process

Active Publication Date: 2021-07-02
CINF ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the conversion of high concentration SO 2 A large amount of air distribution for flue gas will inevitably lead to huge specifications of acid conversion and dry suction equipment, which also limits the comprehensive economic benefits of oxygen-enriched smelting to a certain extent

Method used

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  • a high concentration so <sub>2</sub> conversion acid production process
  • a high concentration so <sub>2</sub> conversion acid production process
  • a high concentration so <sub>2</sub> conversion acid production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] combined with figure 1 The present invention is described in detail as follows with embodiment:

[0031] SO in wet flue gas from purification process 2 The concentration is 29%, O 2 The concentration is 10%, first enter the drying tower for dehydration (no air leakage), then enter the pre-II heat exchanger, the gas temperature rises from 45°C to 190°C, then enter the pre-I heat exchanger, the temperature rises to 390°C, and then enter the pre-heat exchanger A layer of catalyst in the converter reacts, and SO in the flue gas after the reaction 2 concentration down to 22%, O 2 concentration down to 6.5%, SO 3 The concentration is 7%. The 600°C high-temperature flue gas from the pre-first layer conversion reaction first passes through the pre-I heat exchanger and cools down to 400°C, and then enters the pre-two-layer catalyst for conversion. After the reaction, SO in the flue gas 2 concentration down to 15%, O 2 concentration down to 3%, SO 3 The concentration is 14...

Embodiment 2

[0034] combined with figure 2 The present invention is described in detail as follows with embodiment:

[0035] SO in wet flue gas from purification process 2 The concentration is 18%, O 2 The concentration is 17%, first enters the drying tower for dehydration (no air leakage), and then enters the pre-I heat exchanger; the gas temperature rises from 45°C to 420°C, and then enters the pre-reformer for a layer of catalyst reaction. After the reaction, SO in the flue gas 2 concentration down to 11%, O 2 concentration down to 13.5%, SO 3The concentration is 7%. The 600°C high-temperature flue gas from the conversion reaction of the first layer passes through the pre-I heat exchanger and cools down to 255°C, and then enters the economizer to preheat the boiler feed water; the flue gas temperature drops to 190°C and then enters The pre-absorption tower conducts the first absorption to make acid; absorbs SO 3 SO in flue gas after 60℃ 2 concentration rises to 11.8%, O 2 The co...

Embodiment 3

[0038] combined with image 3 The present invention is described in detail as follows with embodiment:

[0039] Contains SO from the purification process 2 The wet flue gas with a concentration of more than 40% first enters the drying tower for dehydration, and the drying tower distributes air to the SO in the flue gas 2 Concentration 37%, O 2 After the concentration is 13%, it enters the pre-II heat exchanger; after the pre-II heat exchange, the gas temperature rises from 45°C to 190°C, then enters the pre-I heat exchanger, the temperature rises to 400°C, and then enters the pre-reformer with a layer of catalyst reaction, SO in the flue gas after the reaction 2 concentration down to 30%, O 2 concentration down to 9.5%, SO 3 The concentration is 7%. The 600°C high-temperature flue gas from the pre-first layer conversion reaction first passes through the pre-I heat exchanger and cools down to 400°C, and then enters the pre-two-layer catalyst for conversion. After the react...

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Abstract

The invention discloses a high concentration SO 2 The conversion acid production process belongs to the technical field of sulfur recovery, and comprises the following steps: (1) mixed with O 2 The purified wet flue gas enters the drying tower for dehydration, and then enters the preheat exchanger to raise the temperature to a predetermined temperature; (2) the purified flue gas after heating enters the catalyst layer of the pre-reformer to react, and the flue gas passes through the catalyst layers of the pre-reformer, SO 2 Concentrations were all decreased by 7%, for any SO at the pre-reforming inlet 2 concentration of flue gas, the flue gas temperature in the outlet layer is controlled to be lower than 620°C; (3) the flue gas from the pre-reformer cools down to the set temperature, and then enters the pre-absorption tower for the first absorption to make acid, after absorbing SO 3 And with the flue gas after the wind, enter the traditional SO 2 Conversion acid system; the invention has a simple process and does not have high requirements for the working conditions of fans, converters and other equipment, and is an easy-to-implement high-concentration SO 2 conversion process.

Description

technical field [0001] The invention belongs to the technical field of sulfur recovery, in particular to a high-concentration SO 2 Conversion of acid production process. Background technique [0002] In non-ferrous metallurgy, with the gradual promotion of oxygen-enriched smelting technology, it has become a reality that the concentration of sulfur dioxide in the flue gas entering the flue gas acid system reaches more than 20%. Due to the temperature resistance limit of the conversion catalyst (about 630°C) and the limitation of the light-off temperature, at the equilibrium conversion rate, the flue gas inlet SO 2 The concentration of not more than 14% is internationally recognized as the highest SO that can be accepted by conversion catalysts. 2 concentration. For the conversion of high concentration SO 2 A large amount of air distribution for flue gas will inevitably lead to huge specifications of acid conversion and dry suction equipment, which also limits the compreh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/76
Inventor 朱智颖袁爱武李伟达
Owner CINF ENG CO LTD
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