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Method and device for reduction absorption treatment of pollutants in natural gas boiler smoke

A technology for boiler flue gas and pollutants, which is applied in separation methods, chemical instruments and methods, and air quality improvement, etc., can solve the problems of inability to take into account removal rate and cost, high investment and operating costs

Inactive Publication Date: 2015-11-18
BEIJING MUNICIPAL RES INST OF ENVIRONMENT PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Removing NOx in flue gas by oxidation absorption method has the advantages of simple method, ability to eliminate white smoke, high NOx removal rate, especially suitable for small and medium boilers, etc., but the investment and operation costs are high, and the removal rate and cost cannot be considered.

Method used

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  • Method and device for reduction absorption treatment of pollutants in natural gas boiler smoke

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Experimental program
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Effect test

Embodiment 1

[0030] The method for reducing and absorbing pollutants in natural gas boiler flue gas of the present embodiment includes the following steps:

[0031] S101. After the initial flue gas is cooled and dewatered by a gas / liquid heat exchanger, the dehydrated flue gas and flue gas condensed water are obtained, and the temperature is lowered to below 50° C.;

[0032] S102, adopting Na of 5% mass concentration 2 S aqueous solution is used as the absorption solution to reduce and absorb NOx in the flue gas in the reduction tower, and the main reaction is:

[0033] Na 2 S+2H 2 O=H 2 S+2NaOH

[0034] Na 2 S+H 2 O=NaHS+NaOH

[0035] 4H 2 S+6NO=N 2 +2N 2 O+4S+4H 2 o

[0036] NaHS+N 2 O=N 2 +S+NaOH.

[0037] The residence time of the cooled flue gas through the reduction absorption tower is 1s, and the liquid-gas ratio is 10L. m -3 .

[0038]S103. After atomization of the depleted part of the reduction absorption solution, it is used to neutralize the soluble acid gas in...

Embodiment 2

[0042] The method for reducing and absorbing pollutants in natural gas boiler flue gas of the present embodiment includes the following steps:

[0043] S201. After the initial flue gas is cooled and dewatered by a gas / liquid heat exchanger, the dehydrated flue gas and flue gas condensed water are obtained, and the temperature is lowered to below 50° C.;

[0044] S202, adopt the Na of 15% mass concentration 2 S aqueous solution is used as the absorption solution to reduce and absorb NOx in the flue gas in the reduction tower, and the main reaction is:

[0045] Na 2 S+2H 2 O=H 2 S+2NaOH

[0046] Na 2 S+H 2 O=NaHS+NaOH

[0047] 4H 2 S+6NO=N 2 +2N 2 O+4S+4H 2 o

[0048] NaHS+N 2 O=N 2 +S+NaOH.

[0049] The residence time of the flue gas after the cooling through the reduction absorption tower is 4s, and the liquid-gas ratio is 25L. m -3 .

[0050] S203. After atomizing the deficient part of the reduction absorption solution, it is used to neutralize the soluble a...

Embodiment 3

[0054] The device for reducing pollutants in natural gas boiler flue gas in this embodiment includes a three-way flue 1, a gas / liquid heat exchanger 2, a reduction absorption tower 3, an induced draft fan 4 and a discharge cylinder 5;

[0055] 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 6, and the other outlet is connected to the discharge cylinder 5 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 of the flue gas is reduced to below 50°C through heat exchange in the gas / liquid heat e...

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Abstract

The invention discloses a method and device for reduction absorption treatment of pollutants in natural gas boiler smoke. The method comprises the following steps: S10 of cooling and dewatering the smoke; S20 of adopting Na2S solution to serve as an absorption solution to perform reduction absorption of NOx and SO2 in the smoke; and S30 of treating and absorbing spent solution. The method and device for reduction absorption treatment of pollutants in natural gas boiler smoke is suitable for smoke emission treatment of all gas boilers and particularly suitable for small and medium boilers. Through the reduction absorption of the Na2S solution, the emission of NOx can be reduced by over 80%, the emission of SO2 is reduced by over 90%, and the running cost is lower than that of an ozone oxidation absorption method by over 50%. In addition, white smoke in the smoke is eliminated by reducing the smoke temperature, and smoke waste heat is recycled.

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 reducing and absorbing pollutants in natural gas boiler flue gas. Background technique [0002] NOx is the formation of secondary fine particles (PM 2.5 ), and automobile 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 that emits less SOx and particulate matter, its NOx emissions are equivalent to those of coal. As cities have higher and higher requirements for environmental quality, the amount of n...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/60
CPCY02A50/20
Inventor 李钢段晶晶
Owner BEIJING MUNICIPAL RES INST OF ENVIRONMENT PROTECTION
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