Waste incineration power plant sulfur recycling device and anti-corrosion method thereof

Abstract

The invention discloses a waste incineration power plant sulfur recycling device, and relates to the field of high-temperature corrosion protection. The device comprises a hydrogen peroxide deacidification system, a sulfuric acid storage and conveying system, an injection system and an incinerator, the hydrogen peroxide deacidification system comprises a hydrogen peroxide preparation and supply system and a wet tower system; the sulfuric acid storage and conveying system comprises a sulfuric acid buffer tank; the injection system comprises a spray gun. Sulfuric acid generated in the deacidification process is sprayed into the incinerator through the double-fluid nozzle, the concentration of alkali metal in flue gas fly ash can be reduced, meanwhile, the chlorine-sulfur ratio of an alkali metal compound is reduced, then the high-temperature corrosion effect of chlorate on a metal heating surface is reduced, the service life of the heating surface is prolonged, and the operation time ofa power plant is prolonged. The invention further relates to an anti-corrosion method of the waste incineration power plant sulfur recycling device.

Description

technical field [0001] The invention relates to the field of high-temperature corrosion protection, and more specifically relates to a sulfur recirculation device in a waste incineration power plant. The invention also relates to an anti-corrosion method for a sulfur recycling device in a waste incineration power plant. Background technique [0002] Due to its advantages in resource recycling and waste volume reduction, waste incineration is one of the main treatment methods for urban waste; my country's waste classification rate is not high, and kitchen waste and plastics account for a large proportion, while kitchen waste contains There are a lot of sodium chloride, potassium chloride, etc., and there are many chlorine-containing compounds in plastics; during the incineration process, HCl gas or alkali metal chlorides will be generated, and alkali metal chlorides with low melting points will be deposited on the heating surface. It can react with metal oxides to destroy the ...

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Problems solved by technology

[0002] Due to its advantages in resource recycling and waste volume reduction, waste incineration is one of the main treatment methods for urban waste; my country's waste classification rate is not high, and kitchen waste and plastics account for a large proportion, while kitchen waste contains There are a lot of sodium chloride, potassium chloride, etc., and there are many chlorine-containing compounds in plastics; during the incineration process, HCl gas or alkali metal chlorides will be generated, and alkali metal chlorides with low melting points will be deposited on the heating surface. It can react with metal oxides to destroy the oxide film on the metal surface. On the other hand, the mixture of various metal chlorides will cause a decrease in the eutectic point, and will melt into a liquid state at high temperature to cause increased corrosion. At the same time, the ash in the semi-molten state has a high surface viscosity , is easily pasted on the metal heating surface, causing coking and slagging on the metal heating surface, further causing high-temperature corrosion of the superheater and lower boiler efficiency (high exhaust gas temperature)

[0003] In order to ensure the ultra-low emission of waste incineration flue gas, the flue gas of general waste incineration adopts the disposal process of "SNCR+semi-dry method+activated carbon injection+bag filter+wet deacidification+SCR denitrification", among which the semi-dry method bears a large For most deacidification tasks, in order to achieve stable and ultra-low emission of acid gas, a wet tower must be installed. Generally, NaOH is used as the deacidification agent, but NaOH solution is expensive and produces waste water, which requires further treatment, treatment investment and operation higher cost

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