79results about How to "Reduce sulfur dioxide content" patented technology

The invention relates to an SWSR (SunWay Sulfur recovery)-1 device and technique. The invention relates to a tail gas treatment combination device and technique by adopting Claus sulfur recovery and ionic liquid cycle absorption process. The device comprises a sulfur production burning furnace, a Claus reaction system, a sulfur production tail gas incinerator, a rich SO2 process gas heat exchanger, an SO2 absorption tower, a rich liquid pump, a lean and rich liquid heat exchanger, an SO2 regeneration tower and a lean liquid feed pump. The technique comprises the steps: (1) enabling hydrogen sulfide-containing acid gas to generate a Claus reaction, and recovering sulfur and heat energy in the reaction process; (2) burning sulfur production tail gas to generate SO2; (3) removing SO2 from rich SO2 process gas through an ionic liquid absorption tower; and (4) feeding rich SO2 ionic liquid into a regeneration tower for separating and regenerating sulfur. The ionic liquid is an aqueous solution which takes organic positive ions and inorganic anions as main components and a little amount of activating agent and antioxidant as additives. The SWSR-1 device and technique are low in equipment investment, high in material safety, short in technique flow, safe and reliable in technique processes, high in SO2 recovery rate, and the content of SO2 in effluent gas can be reduced by 50ppm below which can meet the national regulation requirement.

The composite fuel coal sulphur fixing agent is added into burning coal to reduce released harmful gas SO2. It consists of mixed complex carbonate, calcium carbonate, calcium oxide and magnesium carbonate crushed to 1 mm below size. In different burning temperature, the sulphur fixing agent absorbs SO2 produced by burning coal to produce sulfide staying in cinder, and reduces the exhausted SO2 ans decrease environmental pollution. Using the sulphur fixing agent as clean coal additive is convenient and high in effect.

The invention relates to a method for drying medlar. The method is characterized by comprising the following steps: (1) pre-treating, (2) breaking wax, (3) drying, (4) taking down from a frame, (5) screening, (6) performing color selection, and (7) finely selecting, wherein a steam hot-air circulating and low-temperature drying method is adopted in a drying chamber. According to the method, the cost of equipment investment is low, the drying temperature is easily controlled, the fresh fruit is quickly contracted in the drying chamber, the loss of nutrient content is less, the drying quality is high, the content of sulfur dioxide in the medlar dried according to the method is less than 10mg / kg, and the medlar can be directly eaten.

The present invention discloses a disposal method of a tail gas, which is produced from a thionyl chloride used in a chlorination reaction. The cost of the prior traditional tail gas disposal method is high because of large consumption of alkali, and a high environmental protection pressure is resulted from a plurality of finally produced waste water which contains heteroions. Firstly, the present invention uses water to absorb the hydrogenchloride of the tail gas by controlling the water consumption, and a first grade absorption obtains a concentrated hydrochloric acid, the a hydrogenchloride content of which is approximately saturated and little sulfur dioxide is contained; a second grade absorption is that water is used to process the tail gas after the first grad absorption for the second grade absorption, which is that the added water is not discharged to obtain a diluted hydrochloric acid which contains little hydrogenchloride and little sulfur dioxide, and the diluted hydrochloric acid is used as a liquid of raw material used for the first grade absorption; then the alkali or alkaline water is used to process the tail gas after the second grade absorption for a third grade absorption to absorb the sulfur dioxide in the tail gas and obtain a quite pure sodium sulfite aqueous solution. The disposal efficiency of the present invention is high, and the tail gas absorption is complete, which reduces the environmental protection pressure.