Method and device for synchronously removing sulfur dioxide and nitric oxide by flue gas biological method

A flue gas and biological method technology, applied in chemical instruments and methods, nitrogen preparation, separation methods, etc., can solve the problem of not taking into account the removal, and achieve the requirements of low intake air, cost saving, and water consumption reduction. Effect

Inactive Publication Date: 2013-03-27
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this process only solves the desulfurization problem, and the NO X The removal of

Method used

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  • Method and device for synchronously removing sulfur dioxide and nitric oxide by flue gas biological method

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Effect test

Embodiment 1

[0029] Example 1: The flue gas enters the elution tower after heat exchange, and within 2-3 seconds of the medium residence time, the pollutant SO in the gas phase is 2 / NO X Eluted down, so that after the purification treatment, the emission of gas reaches the standard (SO 2 / NO X≤100mg / Nm 3 ). The eluted waste liquid enters the regulating tank, and COD organic wastewater is added at the same time, and after homogenization, it enters the biosulfurization tower. The microorganisms mainly composed of sulfate-reducing bacteria are in an anaerobic environment with a pH value of 5-6 and a temperature of 25-30°C. , the SO in the liquid phase 4 2- / SO 3 2- Convert to S 2- / HS - . Then the wastewater mainly containing sulfide enters the biological desulfurization nitrogen tower, and the microorganisms mainly composed of Thiobacillus denitrification convert the desulfurization compound into elemental sulfur in an anaerobic environment with a pH value of 7-8 and a temperature...

Embodiment 2

[0030] Embodiment 2: The flue gas enters the elution tower after heat exchange, and the pollutant SO 2 / NO X Eluted down, so that after the purification treatment, the emission of gas reaches the standard (SO 2 / NO X ≤100mg / Nm 3 ). The eluted waste liquid enters the regulating tank, and COD organic wastewater is added at the same time, and after homogenization, it enters the biosulfurization tower. The microorganisms mainly composed of sulfate-reducing bacteria are in an anaerobic environment with a pH value of 6-7 and a temperature of 35-40°C. , the SO in the liquid phase 4 2- / SO 3 2- Convert to S 2- / HS - . Then the wastewater mainly containing sulfide enters the biological desulfurization nitrogen tower, and the microorganisms mainly composed of Thiobacillus denitrification convert the desulfurization compound into elemental sulfur in an anaerobic environment with a pH value of 6.5-7.5 and a temperature of 35-40°C. Nitrogen is turned into nitrogen gas and discha...

Embodiment 3

[0031] Embodiment 3: The flue gas enters the elution tower after heat exchange, and within 2-3 seconds in the medium residence time, the pollutant SO in the gas phase is 2 / NO X Eluted down, so that after the purification treatment, the emission of the gas reaches the standard (SO 2 / NO X ≤100mg / Nm 3 ). The eluted waste liquid enters the regulating tank, and COD organic wastewater is added at the same time, and after homogenization, it enters the biosulfurization tower. The microorganisms mainly composed of sulfate-reducing bacteria are in an anaerobic environment with a pH value of 5-7 and a temperature of 30-35°C. , the SO in the liquid phase 4 2- / SO 3 2- Convert to S 2- / HS - . Afterwards, the wastewater mainly composed of sulfides enters the biological desulfurization nitrogen tower, and the microorganisms mainly composed of Thiobacillus denitrification convert the desulfurized compounds into elemental sulfur in an anaerobic environment with a pH value of 6-7 an...

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Abstract

The invention relates to a method and a device for synchronously removing sulfur dioxide and nitric oxide by a flue gas biological method. The device is formed by connecting a primary eluting tower, an adjusting tank, a secondary biological vulcanization tower, a biological synchronous desulfurization and denitrification tower, a sedimentation tank and a sulfur separator in series. A flue gas purification treatment technology has low inflowing air requirements, is not afraid of dust and heavy metal and does not need strict pre-treatment. Corresponding microorganisms are added into a biological flora to effectively remove heavy metal. Meanwhile, a synchronous desulfurization and denitrification flora is autotrophic bacteria and has certain removing effect on CO2. An operation condition is moderate and the equipment does not need to be antiseptic. Besides, an external substance such as COD (Chemical Oxygen Demand) organic wastewater, only few microorganism nutrient substances and supplementing alkali for adjusting and controlling a pH (Potential of Hydrogen) value in the eluting tower need to be added; and a temperature needed by a rear-end biological reaction is maintained through heat obtained by front-end heat exchange. In a process, large-sized power consumption equipment is not needed; and the device and the method have the advantages that electric power consumption and water consumption are low compared with a conventional treatment process. Compared with the conventional cost, the cost of the whole process is 1/3 that of the conventional process, and the industrial production can be realized.

Description

technical field [0001] The invention relates to the technical field of environmental maintenance, in particular to the simultaneous removal of sulfur dioxide and nitrogen oxides (SO 2 / NO X ) process method and device. This technology is not only suitable for gas purification treatment of flue gas, boiler exhaust gas, natural gas, biogas, chemical fiber waste gas, etc., but also for purification treatment of acid-containing wastewater, sulfate wastewater, and nitrate wastewater. Background technique [0002] The technology of the invention is mainly to solve the problems of fossil fuel tail gas purification treatment and up-to-standard discharge. During the formation of coal, oil, natural gas, bioenergy gas and other energy sources, there are sulfur and nitrogen substances, which form SO after combustion. 2 / NO X , easy to form acid rain, which brings serious pollution and damage to the environment and human body. With the state on SO 2 / NO X With the increasingly str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/60B01D53/78B01D53/84B01D53/75C02F3/34C02F3/28C01B17/04C01B21/02
CPCY02C10/02Y02A50/20Y02C20/40Y02E50/30Y02P20/151
Inventor 徐姣张卫江屈溁敏徐雪涛
Owner TIANJIN UNIV
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