Boiler decoking agent

Abstract

The invention discloses a liquid decoking agent for coal fired boiler, falling into the technical field of coal fired boiler clean combustion and environmental protection control. The liquid decoking agent comprises a decoking agent 0.5-5 wt%, an oxidant 5-25 wt%, a combustion-supporting catalyst 1-10 wt%, an anticorrosion agent 5-30 wt% and water in balance. The decoking agent can promote combustion and falling of coke-layer matter; the oxidant nitrate can release oxygen gas under high temperature, to promote combustion of different positions of dust and carbon; the combustion-supporting catalyst, potassium permanganate and manganese oxide, can act as oxygen atom reaction carrier under high temperature and catalyze combustion of coal powder; and the anticorrosion agent, modified nano-alumina or nano-magnesia, can convert low-melting-point compound in coke layer into loose high-melting-point compound, which facilitates removal of coked layer and prevention of high-temperature corrosion, and after long-term use, the nano-alumina or nano-magnesia will be attached to a heated surface to form a micro-scale anticorrosion layer.

Description

technical field [0001] The invention relates to a boiler decoking agent, in particular to a decoking agent used for removing coking in a water wall pipe of a coal-fired boiler. Background technique [0002] During the coal-fired combustion process of the coal-fired boiler, the heating surface of the water-cooled wall pipe is coked, and the pipes of the passer and reheater accumulate dust, the heat exchange efficiency of the boiler decreases, the exhaust gas temperature rises, and the energy consumption increases. The heating surface of the pipeline is prone to sulfate corrosion due to severe coking, shortening the service life of the boiler, etc. These problems will seriously affect the boiler safety and economical operation. [0003] Chemical additives are a common method of dust removal and coke removal in industry. At present, the main additives for dust removal and coke removal are mainly powder type and solution type. Powder-type additives are used in large quantities...

AI Technical Summary

Problems solved by technology

Powder-type additives are used in large quantities, resulting in high costs

Second, it is difficult to ensure uniform dosing when dosing powder-type additives, and special dosing devices must be used

This patented product mainly uses the "micro-explosion" effect of nitrate under high temperature conditions to remove dust, and the long-term use effect is better, but it has no effect on pulverized coal combustion