An adjustable process for producing SO3 gas by treating high-concentration SO2 flue gas with an inert catalyst

A high-concentration, adjustable technology, applied in the direction of inorganic chemistry, non-metallic elements, sulfur compounds, etc., can solve the problems of large gas volume fluctuations, high investment, and ineffective use of energy, and achieve improved waste heat utilization, high production intensity, and The effect of investment savings

Active Publication Date: 2017-12-26
双盾环境科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of this invention is to provide a kind of can high concentration SO 2 Gas conversion to high concentration SO 3 Gas and high production intensity, clean and energy-saving adjustable application of inert catalysts to treat high-concentration SO 2 Flue gas production SO 3 Gas process, the process is able to deal with SO 2 Flue gas whose concentration (volume ratio) fluctuates in the range of 13% to 32%, and can handle flue gas whose gas volume fluctuates in the range of 40% to 100%; to solve the problem of SO in flue gas 2 High concentration, large gas volume fluctuations, and the need to use a large amount of air dilution to apply traditional conversion technology involves high investment and inefficient use of energy, etc.

Method used

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  • An adjustable process for producing SO3 gas by treating high-concentration SO2 flue gas with an inert catalyst

Examples

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Effect test

Embodiment 1

[0032] Environmental protection desulfurization and recovery of SO in a power plant 2 The gas is used to prepare sulfuric acid, and the gas composition of the flue gas after drying is: SO 2 —30.69%, O 2 —18.47%, N 2 —49.36%, CO 2 —1.48%, the total gas volume is about 90000Nm 3 / hr. Flue gas through SO 2 After the blower 1 is pressurized, it is heated to 390℃ by the heat exchanger 2 and then enters the first inert catalyst conversion layer 31, the conversion rate is about 35%, the outlet temperature is 660℃ and contains SO 2 The concentration is 21.43%; after the heat exchange by the first waste heat utilization device 41 (produces medium pressure 2.5MPa saturated steam 17.7t / hr), the temperature is reduced to 390°C and then enters the second inert catalyst conversion layer 32, the total conversion rate of the reaction is about 60%, Outlet temperature is 580℃ and contains SO 2 The concentration is 13.75%; after the heat exchange by the second waste heat utilization device 42 (prod...

Embodiment 2

[0034] A sulfur-burning sulphuric acid plant uses oxy-fuel combustion to produce SO 2 The gas is used to produce sulfuric acid, and its gas composition after combustion is: SO 2 —20.78%, O 2 —17.39%, N 2 —61.83%, total gas volume is about 115930Nm 3 / hr. Flue gas through SO 2 After the fan 1 is pressurized, it is heated to 390°C by the heat exchanger 2 and then enters the first inert catalyst conversion layer 31, the conversion rate is about 35%, the outlet temperature is 587°C and contains SO 2 The concentration is 14.28%; the heat exchange by the first waste heat utilization device 41 (produces medium pressure 2.5MPa saturated steam 15.56t / hr) is cooled to 420°C and then enters the second inert catalyst conversion layer 32. The total conversion rate of the reaction is about 65%. Outlet temperature is 585℃ and contains SO 2 The concentration is 7.95%; after the second waste heat utilization device 42 heat exchange (produces medium pressure 2.5MPa saturated steam 13.32t / hr), the ...

Embodiment 3

[0036] A copper smelter uses oxygen-rich smelting and blowing to produce SO 2 The gas is used to produce sulfuric acid, and its gas composition after combustion is: SO 2 —15.26%, O 2 —13.04%, N 2 -69.64%, CO 2 —2.06%, total gas volume is about 154800Nm 3 / hr. Flue gas through SO 2 After the blower 1 is pressurized, it is heated to 390℃ by the heat exchanger 2 and then enters the first inert catalyst conversion layer 31, the conversion rate is about 47%, the outlet temperature is 590℃ and contains SO 2 The concentration is 8.55%; after the heat exchange by the first waste heat utilization device 41 (production of medium pressure 2.5MPa saturated steam 17.46t / hr), the temperature is reduced to 390℃, and then it enters the first layer reaction of the traditional active catalyst layer 5. The total conversion rate of the reaction About 85%, the outlet temperature is 550℃ and contains SO 2 The concentration is 2.5%, the exhaust gas is cooled to 420℃ by the corresponding heat exchanger,...

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PUM

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Abstract

The invention discloses an adjustable process for producing SO3 gas by treating high-concentration SO2 flue gas through applying inert catalyst. The process comprises the following steps: a, primarily heating flue gas containing SO2 with concentration of 13 to 32%; b, feeding the flue gas into an inert catalyst conversion layer to enable a portion of SO2 gas to generate SO3 gas, and exhausting the flue gas after the flue gas reaches a set temperature; c, measuring the concentration of SO2 in the exhausted high-temperature flue gas and carrying out heat exchange treatment; d, repeatedly carrying out the steps (b) and (c) when the concentration of SO2 in the high-temperature flue gas measured in the step (c) is higher than 11 percent; feeding low-temperature flue gas subjected heat exchange into a traditional active catalyst layer to produce high-concentration SO3 gas when the concentration of SO2 in the high-temperature flue gas measured in the step (c) is between 7 percent and 11 percent. According to the process disclosed by the invention, by combining the inert catalyst conversion layer and a traditional active catalyst layer, the SO2 gas with the concentration of 13 to 32 percent can be processed; moreover, the production strength is high, and the process is sanitary and energy-saving.

Description

Technical field [0001] The invention relates to a process for preparing sulfuric acid by a contact method, in particular to a method capable of removing high concentration SO 2 Conversion of gas into high concentration SO 3 Gas, high-strength, clean and energy-saving adjustable application of inert catalysts for high-concentration SO 2 Flue gas production SO 3 Gas craft. Background technique [0002] In the sulfuric acid industry from flue gas, the flue gas used is mainly from SO recovered from environmental protection devices in pyrite, sulfur, non-ferrous metal smelting and metallurgy, coal burning, petrochemical industries, etc. 2 Gas, especially the rapid development of oxygen-enriched air combustion and oxygen-enriched air smelting and the development of environmental protection technology of recycling method, flue gas SO 2 The concentration may reach 13% to 93%. The traditional flue gas sulphuric acid plant with two transfers and two suctions, whether it is a 3+1 or 3+2 proce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/79C01B17/78
CPCY02P20/129
Inventor 宋小良徐光泽
Owner 双盾环境科技有限公司
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