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A method and device for oxidizing and absorbing pollutants in natural gas boiler flue gas

A boiler flue gas, oxidation absorption technology, applied in chemical instruments and methods, waste heat treatment, separation methods, etc., can solve the problems of poor purity of by-products, low efficiency of NOx treatment, failure to meet emission standards, etc., and achieve low emissions and operating costs Reduce and eliminate the effect of white smoke

Active Publication Date: 2018-05-08
BEIJING MUNICIPAL RES INST OF ENVIRONMENT PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of the traditional method is that the efficiency of NOx treatment is low, the strict emission standards cannot be met, and the purity of by-products is not wide enough.

Method used

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  • A method and device for oxidizing and absorbing pollutants in natural gas boiler flue gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The method for oxidizing and absorbing pollutants in the flue gas of a natural gas boiler in this embodiment includes the following steps:

[0037] S101. Cooling the flue gas to remove water to obtain dewatered flue gas and acidic flue gas condensed water, the cooling is to lower the temperature to below 47°C;

[0038] S102. The ozone generated by the ozone generator oxidizes the gaseous low-valence nitrogen oxides in the flue gas into water-soluble high-valence nitrogen oxides in the oxidation tower or an alternative oxidation tower. The molar ratio of NO content in the gas is 1.2, the residence time of the flue gas in the oxidation tower or alternative oxidation tower is 1s, and the main reaction is:

[0039] o 3 +NO=O 2 +NO 2

[0040] o 3 +NO 2 =O 2 +NO 3

[0041] NO 2 +NO 3 =N 2 o 5 .

[0042] S103, using a two-stage absorption method to absorb and treat nitrogen oxides and sulfur dioxide in the flue gas, and use an aqueous solution of ammonia substanc...

Embodiment 2

[0054] The method for oxidizing and absorbing pollutants in the flue gas of a natural gas boiler in this embodiment includes the following steps:

[0055] S201. Cooling the flue gas to remove water to obtain dewatered flue gas and acidic flue gas condensed water, the cooling is to lower the temperature to below 47°C;

[0056] S202. The ozone generated by the ozone generator oxidizes the gaseous low-valence nitrogen oxides in the flue gas into water-soluble high-valence nitrogen oxides in the oxidation tower or an alternative oxidation tower. The molar ratio of NO content in the gas is 1.5, the residence time of the flue gas in the oxidation tower or alternative oxidation tower is 1s, and the main reaction is:

[0057] o 3 +NO=O 2 +NO 2

[0058] o 3 +NO 2 =O 2 +NO 3

[0059] NO 2 +NO 3 =N 2 o 5 .

[0060] S203, using a two-stage absorption method to absorb and treat nitrogen oxides and sulfur dioxide in the flue gas, and use an aqueous solution of ammonia substanc...

Embodiment 3

[0072] The device for oxidizing and absorbing pollutants in natural gas boiler flue gas in this embodiment includes a three-way flue 1, a gas / liquid heat exchanger 2, an oxidation tower 3, a primary absorption tower 4, a secondary absorption tower 5, and an induced draft fan 6. Emission cylinder 7 and ozone generator 8;

[0073]The three-way flue 1 is connected to the flue gas outlet of the boiler, one outlet of the three-way flue 1 is connected to the flue gas inlet of the gas / liquid heat exchanger 2 through the flue pipe 10, and the other outlet is connected to the discharge cylinder 7 Connection, since the three-way flue 1 is provided, it can be used to balance the pressure in the combustion chamber of the natural gas boiler. In addition, the liquid inlet of the gas / liquid heat exchanger 2 communicates with the user heating return pipe 11 , and the liquid outlet communicates with the user heating water supply pipe 12 for recovering waste heat from flue gas. The temperature...

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Abstract

The invention discloses a method and device for oxidizing, absorbing and treating pollutants in natural gas boiler flue gas. The method includes the steps of S10, cooling and dewatering the flue gas; S20, feeding ozone to oxidize oxide of low-valence nitrogen in the flue gas, wherein the mole ratio of the ozone amount to the NO content in the flue gas is 1.2-1.5; S30, using the aqueous solution of ammonia substances to absorb and treat the nitric oxide and sulfur dioxide in the flue gas to obtain waste absorption solution; S40, treating the waste absorption solution. The method and device has the advantages that the purifying efficiency of NOx in the flue gas can reach above 85%, emission concentration can be allowed to be lower than 30mg / m<3> even lower than 10mg / m<3>, the strictest international emission standards can be satisfied, the purifying and treating efficiency of SO2 is above 95%, and emission up to standard is guaranteed under any conditions.

Description

technical field [0001] The invention relates to the field of environmental protection for boiler combustion pollution emission control, in particular to a method and device for oxidizing and absorbing pollutants in flue gas of natural gas boilers. Background technique [0002] NOx is formed PM 2.5 Important precursors of secondary particles, vehicle exhaust, coal and natural gas combustion are the main sources of NOx emissions. From August 2012 to July 2013, atmospheric fine particulate matter PM 2.5 A total of 486 valid samples were collected and analyzed. The analysis results show that NOx is a secondary particle precursor with a relatively obvious cumulative effect and a relatively high contribution in the heavy pollution process. [1] . Although natural gas is a relatively clean energy source, the emitted SO 2 and less particulate matter, but NOx emissions are equivalent to those of coal. As cities have higher and higher requirements for environmental quality, the use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/76B01D53/78B01D53/18B01D53/60B01D53/00F27D17/00
CPCY02A50/20Y02P10/143Y02P10/25
Inventor 李钢段晶晶闫静
Owner BEIJING MUNICIPAL RES INST OF ENVIRONMENT PROTECTION