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Method for desulfurating and denitrating simultaneously

A technology for desulfurization, denitrification and nitrate flue gas is applied in the field of flue gas purification, which can solve the problems of poor desulfurization and denitrification effect, complex process technology and high operating cost, and achieve the effect of improving denitration efficiency and improving denitration efficiency.

Active Publication Date: 2013-10-16
ASIA PACIFIC ENVIRONMENTAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above methods have the disadvantages of complex process technology, harsh reaction conditions, poor desulfurization and denitrification effects, and high operating costs.
In addition, selective catalyst reduction and denitrification technology (SNCR) is currently used for denitrification, and then limestone-gypsum method is used for desulfurization. This method has high investment costs and high operating costs, and at the same time produces a large amount of by-product desulfurization gypsum. more difficult to deal with

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Spray the sulfur-containing flue gas at 900°C with ammonia water with a concentration of 20% by weight to convert NO in the flue gas into N 2 , and then sprayed with desulfurization absorption liquid containing ammonium sulfite and ammonium bisulfite to make the remaining NO in the flue gas X is reduced to N 2 , and absorb SO in flue gas 2 gas; absorbed NO X and SO 2 After the exhaust gas reaches the standard, the flue gas is discharged to the outside and absorbs NO X and SO 2 The gas desulfurization absorption liquid is supplemented with ammonia solution and used to circulate and spray the flue gas sprayed by the reducing agent containing NHx groups. Wherein, when the flue gas is sprayed with the desulfurization absorption liquid containing ammonium sulfite and ammonium bisulfite, 0.72 g of copper sulfate is added per liter of the desulfurization absorption liquid. The amount of supplementary ammonia solution corresponds to the evaporation of the flue gas sprayed...

Embodiment 2

[0034] Spray the sulfur-containing flue gas at 700°C with a urea solution with a concentration of 40% by weight to convert NO in the flue gas into N 2 , and then sprayed with desulfurization absorption liquid containing ammonium sulfite and ammonium bisulfite to make the remaining NO in the flue gas X is reduced to N 2 , and absorb SO in flue gas 2 gas; absorbed NO X and SO 2 After the exhaust gas reaches the standard, the flue gas is discharged to the outside and absorbs NO X and SO 2 The desulfurization absorption liquid of the gas is supplemented with ammonia solution and then used to circulate and spray the flue gas sprayed by the reducing agent containing NHx groups. Wherein, when the flue gas is sprayed with the desulfurization absorption liquid containing ammonium sulfite and ammonium bisulfite, 0.75 g of iron sulfate is added per liter of the desulfurization absorption liquid. The amount of supplementary ammonia solution corresponds to the evaporation of the flue...

Embodiment 3

[0036]Spray the sulfur-containing flue gas at 1100°C with ammonia water with a concentration of 25% by weight to convert NO in the flue gas into N 2 , and then sprayed with desulfurization absorption liquid containing ammonium sulfite and ammonium bisulfite to make the remaining NO in the flue gas X is reduced to N 2 , and absorb SO in the flue gas 2 gas; absorbed NO X and SO 2 After the exhaust gas reaches the standard, the flue gas is discharged to the outside and absorbs NO X and SO 2 The gas desulfurization absorption liquid is supplemented with ammonia solution and used to circulate and spray the flue gas sprayed by the reducing agent containing NHx groups. Wherein, when the flue gas is sprayed with the desulfurization absorption liquid containing ammonium sulfite and ammonium bisulfite, 0.78 g of manganese sulfate is added per liter of the desulfurization absorption liquid. The amount of supplementary ammonia solution corresponds to the evaporation of the flue gas ...

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Abstract

The invention relates to a method for desulfurating and denitrating simultaneously, and belongs to the technical field of flue gas purifying. The method comprises the following steps: spraying sulphureous nitrate flue gas at the temperature of 500 DEG C to 1500 DEG C with a reducing agent containing an NHx group, enabling NO in the flue gas to be converted into N2, then using desulfuration absorption liquid containing ammonium sulfite and ammonium hydrogen sulfite to spray, enabling the residual NOX in the flue gas to be reduced into N2, and absorbing SO2 gas in the flue gas; discharging out standard flue gas absorbed with NOX and SO2 , and after being supplied with ammonia water solution, the desulfuration absorption liquid absorbed with NOX and SO2 is used for circularly spraying the flue gas sprayed by the reducing agent containing the NHx group. The method has the benefits that the technology is simple and convenient; the desulfurating and denitrating effect is obvious; the running cost is low; by-products with higher economic values can be produced; the effect of resource recycling is achieved.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and in particular relates to a method for simultaneous desulfurization and denitrification. Background technique [0002] Simultaneous desulfurization and denitrification technology refers to the use of a reactant in a process to remove SO in the flue gas 2 and NO X Simultaneous removal technology. The existing simultaneous desulfurization and denitrification technologies mainly include dry flue gas simultaneous desulfurization and denitrification technology and wet flue gas simultaneous desulfurization and denitrification technology. Among them, dry flue gas simultaneous desulfurization and denitrification technologies include LILAC method, NO X SO method, activated carbon method, circulating fluidized bed method, plasma method; wet flue gas simultaneous desulfurization and denitrification technologies include oxidation absorption method and wet complexation absorption method. ...

Claims

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Application Information

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IPC IPC(8): B01D53/79B01D53/78B01D53/60B01D53/56C05C1/00C05C3/00
CPCY02A50/20
Inventor 曾子平刘应隆周锡飞
Owner ASIA PACIFIC ENVIRONMENTAL CORP
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