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High concentration SO2 conversion acid making technology

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

Active Publication Date: 2019-05-17
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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  • High concentration SO2 conversion acid making technology
  • High concentration SO2 conversion acid making technology
  • High concentration SO2 conversion acid making technology

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%, and 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 rose to 11.8%, O 2 The...

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, and 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 r...

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Abstract

The invention discloses a high concentration SO2 conversion acid making technology, and belongs to the technical field of sulfur recycling. The technology comprises the following steps that (1) O2 doped purified wet smoke enters a drying tower to be dehydrated, and then enters a pre-heating exchanger to be heated to preset temperature; (2) the heated purified smoke enters pre-converter catalyst layers to react, SO2 concentration drops by 7% when the smoke passes through each catalyst layer of the pre-converter, and the smoke temperature at the outlet layer is controlled to be lower than 620 DEG C for smoke with arbitrary SO2 concentration at apre-conversion inlet; and (3) the smoke coming out from the pre-converter is cooled to set temperature, first absorption acid making is conducted after the smoke enters a pre-absorption tower, and the smoke absorbing SO3 and with air being distributed enters a traditional SO2 conversion acid making system. The technology is simple, has low requirements on working conditions that equipment such as draught fans and converters need to adapt to, and is a high concentration SO2 conversion technology easy to achieve.

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 Applications(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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