Dedusting system applied to cupola furnace

Abstract

The invention discloses a dedusting system applied to a cupola furnace. The dedusting system comprises a dust hood arranged above a charging hole of the cupola furnace, a desulfurization temperature regulating tower, a filter cartridge dust remover, a circulating alkaline water tank and a chimney, wherein the dust hood, the desulfurization temperature regulating tower and the filter cartridge dustremover are sequentially connected through air pipes; the desulfurization temperature regulating tower is connected with a water conveying pipeline, the water conveying pipeline is connected with a circulating water pump, the circulating water pump is arranged on a circulating alkaline water tank, the filter cartridge dust remover is connected with the chimney through an air outlet pipe, and an exhaust fan is arranged on the air outlet pipe; the invention discloses the dedusting system applied to the cupola furnace. According to the dedusting system, a wet-and-dry dust removal process is adopted; due to the fact that wet (desulfuration) and temperature control are adopted firstly, a latter-stage dry dust collector does not need to adopt anti-lame, antioxidant and temperature-resistant materials (including filter materials), high-temperature abrupt-change sulfur-containing flue gas can be efficiently captured, the filtering precision of the dust collector body can be improved, the gasemission concentration can reach the European Union standards, and the manufacturing cost is greatly reduced. The dedusting system is suitable for various companies.

Description

technical field [0001] The invention relates to the technical field of dust removal equipment, in particular to a dust removal system applied to a cupola. Background technique [0002] The components of the flue gas produced by the cupola are mainly composed of coke slag, iron oxide, nitrogen oxide, iron sulfide, carbon monoxide, carbon dioxide, sulfur dioxide and H2O. The flue gas discharged outside the furnace has all caused environmental pollution and harm to the human body. Due to the different smelting materials, the composition of flue gas and dust is different, and the composition of particles is also different. [0003] Soot has the following characteristics: [0004] 1. Reasons for easy clogging of cloth bags (i.e. paste bags): [0005] ① Light, fine, highly dispersed and poor fluidity in the flue gas. [0006] ②Fe0, Fe2O3 and Ca0 are easy to crystallize on the surface of the filter material and form blocks to cover the pores of the filter material, and the dust...

AI Technical Summary

Problems solved by technology

[0005] ①Light, fine, large dispersion and poor fluidity in the flue gas

[0008] ① The temperature of the flue gas entering the dust removal is too high, reaching 710°C in the actual measurement, and the shrinkage and deformation of the filter material will increase the running resistance (when the flue gas temperature exceeds the softening temperature point of the filter material, the filter material will fail or be burned)

[0009] ②The wind temperature changes rapidly (actually, it can change suddenly from 65°C to 480°C within 3 seconds), due to the rapid expansion and shrinkage of the heated air volume, it is difficult to accurately calculate the captured air volume (power)

[0010] ③Due to the action of high-pressure blower air, a large amount of "red" coke, metal oxides and slag fine particles are distributed to the feeding port and directly enter the dust removal system, and bag burning accidents often occur

[0011] 3. The flue gas is oxidizing when it is dry, but it is corrosive when it encounters dew condensation

Although particulate matter and gas emissions can meet the standards, in order to adapt to high temperature resistance (measured at 710°C) and anti-oxidation S02, the imported filter materials selected are very expensive. The price of a ￠130X6000 cloth bag is more than 20 times that of domestic cloth bags. , The dust collector body and accessories are specially made of stainless steel in order to prevent oxidation, and the cost is more than 10 times that of ordinary carbon steel

And the operation cost is very expensive, such as a 5-ton cupola or a 10t / h coal-fired boiler, regardless of electricity costs and parts loss, the net filter material needs to be replaced once or twice a year, and the cost of each time is not less than 300,000 yuan RMB, more than 3 million investment, nearly 400,000 annual operating costs, such high investment and operating costs are unbearable for any enterprise

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