Comprehensive utilization method of sintered pollutant
A technology of pollutants and sintering flue gas, which is applied in the field of comprehensive utilization of sintering pollutants, can solve the problems of increasing CO2 emissions, no market for gypsum, waste residue pollution, etc., and achieves a small footprint, good market prospects, and low operating costs. Effect
Active Publication Date: 2011-06-22
HUAXI CHEM INST CHENGDU CITY +1
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[0009] The above methods, in governance SO 2 At the same time as pollution, due to problems such as by-product gypsum having no market and ammonia escape, it will also bring waste residue pollution, ammonia nitrogen pollution, and increase CO 2 Environmental issues such as emissions are inconsistent with my country's sustainable development strategy
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[0021] The sintering machine of a large iron and steel company, the temperature of sintering iron ore is about 550°C, the venting temperature of sintering flue gas is 130-150°C, and the dust content in flue gas is 130mg / Nm 3 , SO 2 The content is 3500~11000mg / Nm 3 , pressure: -5Pa, sintering sewage 84t / h, PH value 12, using such as figure 1 The comprehensive management process of:
[0022] The sintered iron ore at 550°C first passes through the ring cooler, the temperature drops to 250-300°C, and the steam output of the ring cooler is about 24-36t / h. The sintering flue gas is dedusted and cooled by the water washing tower, the outlet flue gas temperature is 40-85°C, and the dust content is ≤30mg / Nm 3 , and then sent to the desulfurization tower, the SO in the flue gas desulfurized by the ionic liquid circulation absorption method 2 Content≤240mg / Nm 3 , Dust content≤10mg / Nm 3 . Absorb SO 2 The final desulfurization liquid is sent to the regeneration tower, heated by the...
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The invention provides a novel comprehensive treatment and utilization method for waste heat, waste gas, waste slag and waste water, aiming at that the sintering process in metallurgical enterprise generates great quantity of waste heat pollution, waste gas pollution, dust pollution and waste water pollution, in order to realize heat comprehensive utilization, dust treatment, mineral recovery, integration of desorption of sulfur dioxide and integration of waste water treatment. The comprehensive utilization method includes: (1) recovering heat carrier of high-temperature heat byproduct (such as hot nitrogen or steam) of the sintered mineral; (2) removing the dust in the sintered smoke by using circular rinse or dynamic wave, and recovering the sintered mineral; (3) removing SO2 in the sintered smoke by using ion liquid circular absorbing desulfurization, and using the by-produced low pressure steam generated in step (1) as the recycled heat source for the desulfurization dissolvent, and by producing high purity SO2 gas; (4) producing SO2 or concentrated sulfuric acid or sulphur by using the by-produced SO2; (5) neutralizing the alkaline waste water generated in the sintered process by using the small quantity of acidic waste water generated in step (2) thereby realizing zero-release for the whole factory.
Description
technical field [0001] The invention relates to a comprehensive utilization method of sintering pollutants, which belongs to the fields of environmental protection and chemical gas separation. Background technique [0002] my country's air pollution is dominated by soot, and the primary pollutant is sulfur dioxide. my country's annual emission of sulfur dioxide is more than 20 million tons, ranking first in the world. [0003] In recent years, my country's metallurgical enterprises have developed rapidly, and the ensuing environmental pollution problems have become increasingly prominent. The main manifestations are: high energy consumption, unreasonable energy utilization, a large amount of heat that has not been utilized, and the ambient temperature of the plant area is too high, forming a heat island. Deterioration of the production environment; the use of simple electrostatic precipitators and bag dust collectors has low dust removal efficiency, serious dust pollution, a...
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IPC IPC(8): B01D53/14B01D53/50B01D53/78C22B1/26F27B21/08F27D17/00
CPCY02P10/20Y02P10/25
Inventor 李东林陈勇汪志和陈亚平肖九高徐洪王睿
Owner HUAXI CHEM INST CHENGDU CITY