Energy-saving environment-friendly ammonia-process desulfurization zero-emission system and method for sulfur recovery device

Abstract

The invention discloses a system and a method for treating tail gas from a sulfur recovery device and byproducing ammonium sulfate. The method comprises the following steps: firstly, removing a large amount of moisture in the tail gas, and treating the moisture to form neutral purified water; absorbing sulfur dioxide in the tail gas by using ammonia to generate a high-concentration ammonium sulfate solution, thereby reducing steam consumption; arranging multi-stage ammonia injection facilities to control different process concentrations so as to guarantee absorption effect, thereby guaranteeing that tail gas emission meets special emission limit value requirements prescribed in the national standards in China under various working conditions; applying the recycled purified to cascade washing so as to realize ultra-clean emission; and recycling the waste heat of the tail gas to dry finished products and eliminate white smoke, thereby lowering energy consumption and improving factory images. According to the invention, ammonium sulfate particles are large in size and low in water content; and no waste liquid is discharged in the production process, no fresh water is consumed, steam consumption is low, and a smoke amount is small. The method comprises a plurality of processes including quenching and absorption, steam stripping, security absorption and washing, oxidation, evaporation, crystallization, filtration and drying, but used equipment is integrated, so multiple functions of one tower are realized, the quantity of the equipment is small, and an occupied area and investment are saved.

Description

technical field [0001] The invention relates to the technical field of sulfur-containing tail gas treatment and environmental protection, and relates to a method for treating tail gas of a sulfur recovery device. This method adopts ammonia absorption to achieve the purpose of desulfurization, low energy consumption by-product ammonium sulfate, tail gas discharge meets the special discharge limit requirements of national standards, no fresh water consumption, no waste liquid discharge, no ammonia escape and ultra-clean discharge. Background technique [0002] With the massive development of sour crude oil and natural gas resources in the world and the continuous development of coal chemical industry, sulfur recovery has become an indispensable supporting environmental protection device. However, the working conditions of sulfur recovery devices are complex, and there are various working conditions in addition to normal working conditions. : Operating conditions such as device...

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Problems solved by technology

Regardless of whether the wastewater is directly discharged to the sewage treatment plant, or after filtration, evaporation, crystallization, the process of by-product ammonium sulfate and sodium sulfate will generate wastewater discharge, causing secondary pollution

[0004] Desulfurization wastewater is harmful to the environment, specifically as follows: (1) Desulfurization wastewater contains high concentrations of sulfate, which will be reduced to S when entering the water environment. 2- , and then related reactions occur to form methylmercury, which affects the survival of aquatic organisms and changes the original ecological functions of water bodies; (2) desulfurization wastewater is weakly acidic and can dissolve heavy metals and certain toxic substances, and direct discharge will damage soil and water Environmental adverse effects, such as selenium entering the soil and water will affect human health, long-term accumulation can also cause chronic poisoning

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