Method for recycling nitrogen gas and sulfur dioxide from calcining iron pyrite burner gas through variable-voltage variable-frequency adsorption

A technology of sulfur dioxide and pressure swing adsorption, which is applied in the direction of chemical instruments and methods, sulfur compounds, separation methods, etc., can solve the problems of large amount of slag output, large equipment investment, and low production cost, so as to avoid difficult disposal and engineering Green effect of investment and process

Active Publication Date: 2014-07-16
GUANGXI UNIV
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  • Claims
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AI Technical Summary

Problems solved by technology

This method has mature technology and low production cost, but the absorption rate is slow, the absorption capacity is small, the practical application value of the by-product calcium sulfate is not great, and the output slag is large, which leads to serious scaling of equipment and pipelines
The sodium method uses alkaline substances such as sodium citrate, sodium carbonate or sodium hydroxide to absorb sulfur dioxide-containing flue gas to generate sodium sulfite or sodium bisulfite solution. The advantages are large absorption capacity, fast absorption rate, high desulfurization efficiency, and simple equipment , easy to operate and not easy to scale, the disadvantage is that the raw material sodium alkali is more expensive, and the production cost is high
The common problems of the above methods are: ① The investment cost of the desulfurization equipment project is large
② Subsequent treatment of by-products after desulfurization is difficult
③ Unable to meet the requirements of environmental protection or high operating costs for environmental protection
Therefore, it is necessary to propose a method for recovering nitrogen and sulfur dioxide in roasted pyrite furnace gas by using pressure swing adsorption technology, so as to overcome the problems of large equipment investment, difficult follow-up by-product treatment and failure to meet environmental protection requirements in the traditional recovery of useful gases. , to realize the comprehensive utilization and zero emission of roasting pyrite flue gas

Method used

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  • Method for recycling nitrogen gas and sulfur dioxide from calcining iron pyrite burner gas through variable-voltage variable-frequency adsorption
  • Method for recycling nitrogen gas and sulfur dioxide from calcining iron pyrite burner gas through variable-voltage variable-frequency adsorption
  • Method for recycling nitrogen gas and sulfur dioxide from calcining iron pyrite burner gas through variable-voltage variable-frequency adsorption

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Embodiment 1

[0036] The furnace gas from the fluidized bed furnace for roasting pyrite is recovered by the high-temperature waste heat boiler, the medium temperature and low temperature cooling purification after cyclone dust removal and electric dust removal, dust removal and sulfur trioxide, drying and cooling. At this time, the temperature of the furnace gas is 35°C , with a mass ratio of sulfur dioxide of 12%, CO 2 and O 2 The content of N2 is less than 1%, and N2 is 87%; then the dust particles and rust entrained in the mixed gas are removed through a refined sulfuric acid furnace gas filter made of 200-mesh polytetrafluoroethylene, and then adsorbed by a fine extraction tank loaded with combined carbon molecular sieves Remove traces of water and O in the mixed furnace gas 2 and CO 2 , at this time, the water content in the mixed furnace gas is reduced to 2.1mg / kg, the content of sulfur dioxide is about 12.5%, and the N 2 The content is about 87.5%; then compressed by the compresso...

Embodiment 2

[0042] The sulfur dioxide-containing furnace gas from the fluidized bed furnace for roasting pyrite is recovered by the high-temperature waste heat boiler, and after the cyclone dust removal and electric dust removal, the medium temperature cooling purification and low temperature cooling purification, dust removal and sulfur trioxide removal, drying and cooling, at this time, Furnace gas temperature is 40°C, sulfur dioxide content is 7%, CO 2 and O 2 content of less than 1%, N 2 92%; and then through a 200-mesh polytetrafluoroethylene refined sulfuric acid furnace gas filter to remove dust particles and rust entrained in the mixed gas, fine desorption tank adsorption to remove trace water and O in the mixed furnace gas 2 and CO 2 , at this time, the water content in the mixed furnace gas is reduced to 3.2mg / kg, the content of sulfur dioxide is about 7.5%, and the content of N2 is about 92.5%; The exhaust pressure is 0.55MPa, and the exhaust temperature is about 41°C at nor...

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Abstract

The invention discloses a method for recycling nitrogen gas and sulfur dioxide from calcining iron pyrite burner gas through variable-voltage variable-frequency adsorption. The method comprises the following steps: dedusting, purifying, drying and cooling the calcining iron pyrite burner gas, and removing dust particles and rust by a refining sulfuric acid burner gas filter made of a 200-mesh polytetrafluoroethylene material; deeply dehydrating by a refining dehydrating tank in a refining manner, deoxidizing and removing carbon dioxide, separating N2 and SO2 through variable-voltage variable-frequency adsorption, compressing or cooling and performing gas-liquid separation to obtain liquid SO2, bottling the separated nitrogen gas and the liquid SO2 for industrial use, and enabling SO2 which is not liquefied and separated to enter a circulating process of compression or cooling and gas-liquid separation, so as to enable SO2 to be separated continuously. The method realizes comprehensive utilization and zero emission of mixed burner gas containing a great amount of nitrogen gas and sulfur dioxide caused by calcining of iron pyrite, the obtained liquid SO2 has high purity, the process is green, safe and energy-saving, and realizes zero emission and low cost.

Description

technical field [0001] The invention relates to a method for recovering nitrogen and sulfur dioxide in roasting pyrite furnace gas by frequency conversion and pressure swing adsorption. Background technique [0002] Liquid sulfur dioxide is a colorless, transparent liquid with a pungent odor. Its gasification is strong. When the concentration of sulfur dioxide in the air reaches 0.04% to 0.05%, it will be poisoned to the human body if it is inhaled, and it will irritate the breath and eyes. Liquid sulfur dioxide is widely used and is an important chemical raw material, which can be used to produce synthetic fibers (mainly nylon), detergents, rubber additives, hydrosulfite (sodium dithionite), plastics, dyes, medicines, lubricating oils and saccharin etc. It can also be used as refrigerant, bleaching powder, fire extinguishing agent and disinfectant, etc. In recent years, with the development of my country's modern industry, the demand for liquid sulfur dioxide is increasin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/047B01D53/02B01D50/00C01B17/56C01B21/04B01J20/18B01J20/20
CPCY02C20/40Y02E50/30Y02P20/10Y02P20/129Y02P20/151Y02P20/50
Inventor 卢朝霞黄福川司亚楠毛汉领曹传东陈彪卢誉远黄伊琳刘宇恒
Owner GUANGXI UNIV
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