Binary adjustable pre-converting method for preparing sulfuric acid from high concentration sulfur dioxide flue gas

A technology of sulfur dioxide and pre-conversion, applied in chemical instruments and methods, inorganic chemistry, sulfur compounds, etc., can solve the problems of huge equipment, increased investment and operating costs, and unfavorable comprehensive heat recovery, etc., to reduce operating costs and reduce equipment investment Reduced effect

Active Publication Date: 2017-08-04
双盾环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The equipment in the conversion section and the dry suction section of the conventional conversion process is huge, which is not conducive to the comprehensive recovery of heat, and the corresponding investment and operation costs will increase by about 20%.

Method used

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  • Binary adjustable pre-converting method for preparing sulfuric acid from high concentration sulfur dioxide flue gas

Examples

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Embodiment 1

[0028] A gold smelting enterprise in Henan, the smelting flue gas of a gold smelting project (when the smelting furnace is fully loaded, working condition 1), contains SO 2 The volume concentration is 16.5%, containing O 2 The volume concentration is 13%, and the flue gas flow rate is 100000Nm 3 / h. The process of adopting the pre-conversion sulfuric acid method of the present invention is as follows: from the outside world containing SO 2 The flue gas with a concentration of 16.5% and a temperature of 80°C is passed through SO 2 After the blower 1 is pressurized, it enters the initial cold and hot heat exchanger 2, and performs heat exchange with the hot flue gas at the outlet of the traditional catalyst three-layer 53. The temperature rises to 200°C, and the SO after heat exchange 2 The flue gas enters the initial thermal heat exchanger 3 again, and exchanges heat with the hot flue gas at the exit of the first layer 51 of the traditional catalyst, and the SO after two heat...

Embodiment 2

[0030] A gold smelting enterprise in Henan, the smelting flue gas of the gold smelting project (when part of the smelting furnace is running, working condition 2), SO 2 The volume concentration is 13%, O 2 The volume concentration is 13.5%, and the flue gas flow rate is 110000Nm 3 / h. The process of adopting the pre-conversion sulfuric acid method of the present invention is as follows: from the outside world containing SO 2 The flue gas with a concentration of 13% and a temperature of 80 ° C is passed through SO 2 After the blower 1 is pressurized, it enters the initial cold and hot heat exchanger 2, and performs heat exchange with the hot flue gas at the outlet of the traditional catalyst three-layer 53. The temperature rises to 260°C, and the SO after heat exchange 2 The flue gas then enters the initial thermal heat exchanger 3, and exchanges heat with the hot flue gas at the outlet 51 of the traditional catalyst layer. After two heat exchanges, the temperature of the flu...

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Abstract

The invention discloses a binary adjustable pre-converting method for preparing sulfuric acid from high concentration sulfur dioxide flue gas. The method comprises the following steps: a. high concentration SO2 flue gas successively subjected to twice heat exchange reaches the initiation temperature of a catalyst; and b, all (when the concentration is 14.5-20%) or part (when the concentration is 11-14.5%) of the high concentration SO2 flue gas enters a pre-converting catalyst layer of a converter for a converting reaction, the temperature is raised in reaction, and the flue gas leaves the pre-converting catalyst layer and enters a conventional #1 catalyst layer before the glue gas reaches the SO2 equilibrium conversion or is mixed with residual part of high concentration SO2 flue gas to enter the conventional #1 catalyst layer for a conventional '31-42'3+1 double-conversion and double-absorption normal flow for acid preparation. According to the method disclosed by the invention, SO2 concentration in flue gas entering the converting system fluctuates between 11% and 20%, the flue gas amount for preparing acid is decreased by 20-35%, the equipment investment is reduced by 20%, and the operating cost is lowered by 20%.

Description

technical field [0001] The invention relates to the technical field of sulfuric acid production and waste heat recovery, in particular to sulfur acid production, smelting flue gas acid production, pyrite acid production and other SO 2 The technical field of producing sulfuric acid from flue gas is also applicable to other technical fields related to chemical reaction engineering with exothermic properties, specifically a method for producing sulfuric acid by binary adjustable pre-conversion of flue gas with high concentration of sulfur dioxide. Background technique [0002] High-concentration conversion technology in sulfuric acid production has always been a difficult problem in the industry. In the field of non-ferrous smelting flue gas acid production, with the advancement of non-ferrous metal oxygen-enriched technology, the concentration (volume) of sulfur dioxide produced by modern smelting furnaces is as high as 20% to 40% and the flue gas volume And the concentration ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/765
CPCY02P20/129C01B17/765
Inventor 宋小良李淑全
Owner 双盾环境科技有限公司
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