Decoking and coal-saving additive for supercritical or super-supercritical boiler

Abstract

The invention discloses a decoking and coal-saving additive for a supercritical or super-supercritical boiler. The additive comprises the components in percentage by weight as follows: 8.5-12.3% of magnesium nitrate, 5.0-7.2% of cupric nitrate, 6.0-8.5% of ammonium chloride, 1.2-2.5% of ammonium bicarbonate, 2.3-3.6% of boric acid, 1.5-2.0% of sodium dodecyl sulfate, 1.2-2.8% of modified nano ceramic powder dissolved in water, 1.2-2.2% of stabilizer and the balance of water. The additive provided by the invention has the advantages that 1, the additive is simple to operate and small in use level; 2, the decoking effect is good, and coke blocks can be quickly smashed; 3, the additive is less in environmental pollution, less in heavy metal salt content and less in smoke carried and generated by combustion and heavy metal; 4, the using safety of the boiler can be improved, and after coking of the boiler, the additive is quickly used to effectively prevent tube explosion of the boiler, and meanwhile to prevent large coking blocks from falling into a submerged chain conveyor to lead to major accident of chain breakage of the submerged chain conveyor; and 5, the additive is safe and non-toxic and does not harm the human body.

Description

technical field [0001] The invention belongs to coal additives, in particular to a coke-removing and coal-saving additive for supercritical or ultra-supercritical boilers. Background technique [0002] Due to large capacity, high parameters, high thermal efficiency and environmental protection, more and more supercritical or ultra-supercritical thermal power generating units have been put into construction or operation. However, due to the influence of various factors such as unit combustion conditions and coal quality, severe coking and ash deposition are prone to occur in actual operation. Boiler coking will increase the thermal resistance of water-cooled wall tubes, and in severe cases, tube burst accidents will occur. [0003] At present, domestic supercritical or ultra-supercritical generating units generally solve the problem of coking by combining manual decoking or soot blowing. However, the above methods cannot play an effective role when the coking is serious. D...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a coke-removing and coal-saving additive for supercritical or ultra-supercritical boilers with little corrosion to metal materials, no pollution to the environment, easy to use, and low cost, so as to solve the problem of supercritical or ultra-supercritical firepower. Generator set coking problem