| According to the latest environmental online monitoring data of the Guizhou Provincial Environmental Protection Department, the sulfur dioxide emission of the first pit high-concentration phosphate fertilizer base, the Kaifeng Group Mineral Fertilizer Company, since the trial production in August 2010, the average sulfur dioxide emission in the exhaust gas is less than 100 mg. / cubic meters, far below the country's new standard of 400 mg / cubic meter. This is the result of the company's first domestic transplant of thermoelectric ammonia desulfurization technology in the same industry. According to Zhang Cheng, assistant general manager of the mineral fertilizer company and deputy chief engineer of the sulfuric acid project, in order to effectively solve the sulfuric acid tail gas emission, the company took the lead in adding a desulfurization tower after the second absorption tower of the sulfuric acid plant, and the exhaust gas discharged from the second absorption tower entered the desulfurization. After the tower, the ammoniated absorption liquid is used to circulate and absorb the sulfur dioxide in the exhaust gas to form ammonium sulfite; the desulfurized tail gas is removed by the defogging layer in the tower to remove the acid mist, so that the tail water is less than 100 mg/m3 under standard conditions. After purification, the exhaust gas is discharged through the exhaust gas chimney; the ammonium sulfite in the absorption liquid is oxidized to the ammonium sulfate solution by the air blasted through the aeration fan at the bottom of the tower, and is reused when the circulating liquid ammonium sulfate concentration reaches 25% to 30%. Pumped to the tail gas scrubbing system of the DAP plant to replace some of the sulfuric acid and washing water, so that the total system sulfuric acid consumption is reduced by 40%, and the economic benefits are considerable. It is understood that the new ammonia desulfurization technology uses ammonia as an absorbent for exhaust gas and flue gas desulfurization, recovers sulfur resources, and produces ammonium sulfate by-product. There is no discharge of waste water and waste slag in the whole process, which is a typical circular economy type desulfurization technology. It is also a new technology that the National Development and Reform Commission supports and promotes and adapts to local conditions. After one year of trial production using this technology, the company's sulfuric acid plant recovers more than 1,660 tons of sulfur dioxide per year, saving 2,540 tons of pure sulfuric acid and increasing output value by 1.48 million yuan. |
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