High-efficiency and environment-friendly coal-fired system for vertical boiler with bottom-built burner

Abstract

The invention discloses a high-efficiency and environment-friendly coal-fired system for a vertical boiler with a bottom-built burner. The system comprises a coal powder tower, a burning boiler, an air preheater mechanism, a cyclone dust collector mechanism and a bag-type dust collector mechanism that are sequentially arranged and connected, wherein the burning boiler comprises a boiler body and the bottom-built burner; the bag-type dust collector mechanism comprises a sealed casing, a high-efficiency dust collector and an ash storage bin; a fume outlet of the sealed casing is connected with a tower fume outlet of a desulfurizing tower by an induced fan; and a discharge outlet of the ash storage bin is connected with an ash inlet of a coal powder ash tank by a conveying mechanism. As the coal-fired system is subjected to a series of technological innovations and transformations, the boiler thermal efficiency is very high; the dust collection sealability is good; the collection efficiency is excellent; the desulfurizing tower is very good in desulphurization efficiency, and excellent in scale prevention and scale removal performance; the high-efficiency desulfuration and labor saving are ensured; finally a fume emission index of the system is far lower than the national specified emission concentration; and the system achieves the benefits of high efficiency, energy saving, emission reduction and environmental protection, and is a domestic initiative.

Description

technical field [0001] The invention relates to the technical field of coal-fired systems, in particular to a high-efficiency and environment-friendly coal-fired system with a bottom-mounted burner vertical boiler, in particular to a coal-fired system made of low-nitrogen powder (including coal powder, biomass powder, dry domestic sludge) Powder) burner, vertical boiler, PM2.5 cyclone and bag filter, double-layer variable-diameter swirl desulfurization tower, new coal powder metering pneumatic storage and supply system, etc. Background technique [0002] In my country's primary energy composition and consumption, coal accounts for as high as 70%. my country's coal consumption and emissions of sulfur dioxide and nitrogen oxides are major international emissions. my country is a country rich in coal, poor in steam, and poor in oil. The use of coal as fuel for domestic small and medium-sized industrial boilers will be the basic status quo in the medium and long term. The "Elev...

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Problems solved by technology

At present, there are about 580,000 small and medium-sized industrial boiler coal-fired systems with a capacity of 1.8 million steam tons in China. Due to the limited existing technology, the combustion performance of the boiler is not good, which leads to low thermal efficiency of the boiler, generally between 40% and 60% %, the energy utilization rate is low, the flue gas produces a large amount and is mixed with a large amount of sulfur dioxide and nitrogen oxides, and the recycling rate of the flue gas is low, which also brings great difficulties to the subsequent flue gas treatment, such as the collection of soot The workload is heavy and the dust removal efficiency is low, the desulfurization tower cannot adapt to the large change of flue gas volume, resulting in poor desulfurization treatment, etc., and finally the emission concentration of flue gas nitrogen oxides and sulfur dioxide is far from meeting or can only barely meet the emission indicators, so it brings inevitable pollution and damage to the atmospheric environment

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