Acid making process and device adopting SO2 pre-reforming

A SO2, pre-conversion technology, used in sulfur dioxide/sulfurous acid, inorganic chemistry, sulfur compounds, etc., can solve problems such as catalyst over-temperature burning, and achieve the effect of good operation stability

Active Publication Date: 2017-05-17
中铝国际南方工程有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the SO2 concentration of the flue gas that this process can handle is up to 16-18%. The gas can leave the catalyst layer away from the equilibrium point, otherwise, once the flue gas volume of the system decreases, the probability of the catalyst being overheated and burned is quite high
The adaptability to flue gas fluctuations in different working conditions of smelting flue gas can only be adjusted by building a conversion dry suction system to match the flue gas volume adjustment

Method used

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  • Acid making process and device adopting SO2 pre-reforming

Examples

Experimental program
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Effect test

Embodiment 1

[0056] Embodiment 1 (without preabsorption device, such as figure 1 ):

[0057] initial SO 2 The concentration is 65%, O 2 The flue gas with a concentration of 35% enters the pre-circulation heat exchanger, is heated by the high-temperature flue gas at about 500°C after passing through the steam superheater, and then combines with the SO2 sent by the pre-circulation fan. 3 The flue gas is mixed to about 400°C and enters the inlet of the pre-reformer together. SO of mixed flue gas 2 The concentration was reduced to 27.26%, SO 3 Concentration 55.9%, O 2 The concentration is 16.83%, and it enters the pre-reformer for equilibrium conversion reaction. The gas temperature at the outlet of the pre-reformer reaches about 610°C, the equilibrium conversion rate is 36.27%, and the SO in the flue gas 2 The concentration is 18.28%, SO 3 Concentration is 69.21%, O 2 The concentration is 12.5%. The pre-reformed high-temperature flue gas first enters the steam superheater to produce...

Embodiment 2

[0058] Embodiment 2 (has pre-absorption device, as figure 2 ):

[0059] initial SO 2 The concentration is 35%, O 2 The flue gas with a concentration of 35% enters the pre-circulation heat exchanger, is heated to 400°C by the high-temperature flue gas after pre-transformation, and then sends 400°C SO with the pre-circulation fan. 3 The flue gas is mixed and enters the pre-reformer together, and the mixed SO 2 The concentration was reduced to 14.24%, O 2 The concentration is 26.82%, SO 3 The concentration is 25.16%, the equilibrium conversion occurs when entering the pre-reformer, the temperature of the gas exiting the pre-reformer is 610°C, and the equilibrium conversion rate is 55.55%. Pre-reformed export SO 2 The concentration is 6.6%, O 2 Concentration is 23.8%, SO 3 The concentration is 34.43%. The converted high-temperature flue gas first enters the pre-circulation heat exchanger to heat the high-concentration SO 2 The gas reaches 400°C, and then enters the wast...

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Abstract

The invention relates to an acid making process and device adopting SO2 pre-reforming. Initial SO2 flue gas mixed with O2 is heated by a pre-circulating heat exchanger and mixed with SO3 flue gas sent by a pre-circulating fan, and the mixed gas enters a catalyst layer of a pre-reformer for a reaction; SO3 flue gas at an outlet of the pre-reformer enters the pre-circulating heat exchanger directly or through a steam superheater, and the initial SO2 flue gas is heated; the SO3 flue gas cooled by the pre-circulating heat exchanger is divided into two parts; one part is extracted by the pre-circulating fan and mixed with the heated initial SO2 flue gas, and the mixed gas enters the pre-reformer; the other part enters a traditional SO2 reforming acid system directly or through a pre-absorbing device. The pre-circulating reforming process has very high adaptability to concentration fluctuation of SO2 in the flue gas and can be taken as a preprocessing module to be directly connected before a traditional '3+1' double-reforming double-absorbing acid making system without intervening in a follow-up '3+1' acid making process. High-concentration SO2 reforming requirements not exceeding the extreme resisting temperature of a catalyst are met.

Description

technical field [0001] The present invention relates to a kind of SO in sulfuric acid industry 2 Contact acid production technology, specifically related to a kind of SO 2 Gas pre-conversion acid production process and equipment. Background technique [0002] In the unconventional high-concentration SO2 currently put into industrial production 2 In the flue gas conversion process, the technologies adopted by foreign companies mainly include: 1. Outotec’s LUREC TM cyclic conversion process. 2. The "pre-conversion process" of Mengmoke Company. 3. BAYQIK of Bayer Technologies TM Preconversion preabsorption process. The technologies adopted by domestic companies mainly include: 1. "Pre-conversion and pre-absorption process"; 2. "Non-equilibrium" high-concentration SO 2 transforming technology. [0003] Outotec's LUREC TM The circulation transformation technology mainly utilizes the circulating flue gas after the first transformation (three-layer transformation) to extra...

Claims

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Application Information

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IPC IPC(8): C01B17/76C01B17/48
CPCC01B17/48C01B17/76
Inventor 朱智颖吴桂荣袁爱武李伟达
Owner 中铝国际南方工程有限公司
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