Biomass preventing corrosion of superheater and garbage power generation boiler

Abstract

The invention discloses a biomass preventing the corrosion of superheater and a garbage power generation boiler, belonging to power generation equipment using renewable sources as fuel. The garbage power generation boiler comprises a boiler body, characterized in that: a circular secondary air box is arranged around a furnace arc part of a hearth and the spacing between a front arc and a rear arc is appropriately shortened; a limestone powder funnel is arranged at a secondary air main, limestone powder is fully mixed with smoke gas under the driving of secondary air so as to reduce the content of chlorine in the smoke gas; a shaft flue I, a shaft flue II and a shaft flue III are arranged sequentially at a high-temperature smoke gas outlet of the hearth, a superheater pipe is arranged inside the shaft flue II and controlled within 800 DEG C; a box body for fixing a zinc spelter is arranged at a descending pipe wall which is adjacent to a high-temperature superheater inlet header and a low-temperature superheater outlet header, and the zinc spelter is connected with the high-temperature superheater inlet header or the low-temperature superheater outlet header via conducting wires; the garbage power generation boiler has obvious effect in preventing the corrosion of the superheater, prolongs the service life of the superheater and includes low cost, simple and convenient construction and maintenance.

Description

technical field [0001] The invention relates to a power generation equipment using renewable energy as fuel, in particular to a power generating boiler using biomass or garbage as fuel. technical background [0002] The biggest problem of power generation boilers burning biomass and garbage is that the superheater is severely corroded. One of the important reasons is that the smoke generated during the combustion of biomass and garbage contains a large amount of chloride, HCl, and Cl. 2 Harmful gases, such as harmful gases, have a strong corrosive effect on alloy superheater tubes. At present, power generation boilers burning biomass and garbage only set secondary air at the front and rear arches of the furnace, and the distance between the front and rear arches is relatively large. The mixed combustion of wind and flue gas is not sufficient, the residence time of flue gas in the furnace is short, and a large amount of chloride and HCl, Cl contained in flue gas 2 Such harmf...

AI Technical Summary

Problems solved by technology

[0002] The biggest problem of power generation boilers burning biomass and garbage is that the superheater is severely corroded. One of the important reasons is that the smoke generated during the combustion of biomass and garbage contains a large amount of chloride, HCl, and Cl. 2 Harmful gases, such as harmful gases, have a strong corrosive effect on alloy superheater tubes. At present, power generation boilers burning biomass and garbage only set secondary air at the front and rear arches of the furnace, and the distance between the front and rear arches is relatively large. The mixed combustion of wind and flue gas is not sufficient, the residence time of flue gas in the furnace is short, and a large amount of chloride and HCl, Cl contained in flue gas 2 Such harmful gases enter the flue without treatment, causing corrosion to the alloy superheater tube, especially under continuous ultra-high temperature conditions, which will accelerate the corrosion rate. After the boiler has been running for about a year, the superheater will burst. Replacing a new superheater reduces boiler life and increases boiler operation and maintenance costs

A 110t / h high-temperature and high-pressure straw direct-fired boiler was disclosed in the fifth issue of "Industrial Boiler" in 2008, "Introduction to Domestic Straw Direct-fired Boilers". Corrosion of alloy materials has a certain effect on protecting the superheater, but it still cannot solve the problem of chlorine element corrosion on the superheater

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