63 results about "Ammonium hydrogen sulfite" patented technology

The invention discloses an application method of fine desulfurization in sulfuric acid exhaust absorption, and relates to a technical scheme of the application of fine desulfurization in sulfuric acid exhaust absorption, in particular to a method for discharging SO2 exhaust. The method comprises the following steps of: A, introducing sulfur-containing exhaust into an absorption tower; and B, spraying ammonium sulfite-ammonium hydrogen sulfite solution serving as a fine desulfurization solution with the pH value of 5.6 to 6.1 from the top of the tower to absorb SO2 and SO3 in the sulfur-containing exhaust, and regulating the gas-liquid ratio to be (350-370): 1, wherein according to the concentration of aqueous ammonia in step B, the absorption mother solution refluxes to a mother solution circulating tank from the bottom of the absorption tower, and 10.3 to 10.6 mass percent of diluted aqueous ammonia is added, so that the ratio of (NH4)2SO3 to NH4HSO3 in the absorption solution is unchanged in an optimal range of the ammonium sulfite-ammonium hydrogen sulfite solution serving as the fine desulfurization solution; and the temperature of the mother solution in step B is between 25 and 30 DEG C. After the sulfur-containing exhaust is treated, the conversion rate of a sulfur acid device is more than or equal to 99.5 percent, and 60mg / Nm<3> of SO2 exhaust is discharged; and by substituting the expensive imported accelerant for the cheap domestic accelerant, the national emission standard can also be achieved, and the cost is reduced.

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.

The invention discloses a fluidized bed-based flue gas combined desulfurization and denitration process. An ammonia-containing reducing agent and flue gas after dust removal are subjected to gas-phase desulfurization reaction at a desulfurization region; ammonia and sulfur dioxide react under the action of vapor to generate ammonium sulfite and ammonium bisulfite to be adsorbed by an SCR (Selective Catalytic Reduction) denitration catalyst; desulfurized flue gas is subjected to SCR denitration reaction of the ammonia-containing reducing agent and nitrogen oxide at the SCR reaction region; and after being desulfurized, regenerated and activated, catalyst grains are circulated back to the SCR reaction region to be reutilized. The invention discloses a device for implementing the process. Through the process, liquid-state sectional desulfurization and denitration are realized in a fluidized reaction tower, so that adverse effect of the sulfur dioxide in medium and low-temperature flue gas on SCR catalytic desulfurization is overcome; and the process is suitable for desulfurization and denitration of low-temperature and high-sulfur flue gas of industrial boiler kiln and has broad market application prospect.