Chemical additive for slag removal of boiler fuel coal

Abstract

A chemical additive for slag removal of boiler fuel coal is composed of the following raw materials in parts by weight: 30 to 40 parts of lime, 30 to 40 parts of borax, 1 to 10 parts of sodium chloride, 10 to 20 parts of hexamethylenetetramine, 1 to 10 parts of vanadium (V) pentoxide, and 1 to 5 parts of sodium hydroxide. The addition amount of the chemical additive is 0.1% of the coal weight, the initial addition amount is 2 to 3 times of the normal addition amount, and the treatment course lasts for about two weeks. The solid powder is fully dissolved in water to obtain a solution, wherein the volume of added tap water is usually 10 times or more of the volume of the solid powder according to the dryness level of the coal, then the solution is evenly sprayed on fuel coal to be added into a furnace, the total water content of the coal is controlled at 12% after addition of the additive, and the coal layer thickness or the fire grate rotation number is reduced properly. The chemical additive is a non-toxic and harmless liquid, is safe and convenient to use, has a stable performance, does not corrode the boiler, and can be stored for a long time without degradation. After addition of the chemical additive, the hard scales (ash) on the boiler pipelines can fall off completely, moreover, a layer of anticorrosive film can be formed on the surface of metal by the chemical additive after the scales are removed so as to protect the metal from acidic gas such as SO2, and the like, thus the service life of boiler can be prolonged, the maintenance frequency is reduced, the coal saving rate is improved, and the boiler thermal efficiency is improved therefore.

Description

technical field [0001] The invention relates to a chemical additive, in particular to a chemical additive for boiler coal-fired slag removal. Background technique [0002] The safe and economical operation of boilers is the goal of boiler users, especially industrial boilers such as coal-fired boilers and oil-fired boilers. During the combustion process, serious ash deposits will occur on water-cooled walls and superheaters, and the result of ash deposits will inevitably It will reduce the thermal efficiency of the boiler, block the flue gas passage, and cause the temperature of the superheated steam to rise, thereby endangering the safe operation of the boiler, and may even cause uneven heating of the water wall of the boiler and cause the consequences of tube explosion. Contents of the invention [0003] In order to overcome the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a chemical additive for boiler coal-fired slag ...

AI Technical Summary

Problems solved by technology

[0002] The safe and economical operation of boilers is the goal of boiler users, especially industrial boilers such as coal-fired boilers and oil-fired boilers. During the combustion process, serious ash deposits will occur on water-cooled walls and superheaters, and the result of ash deposits will inevitably It will reduce the thermal efficiency of the boiler, block the flue gas passage, and cause the temperature of the superheated steam to rise, which will endanger the safe operation of the boiler, and may even cause uneven heating of the water wall of the boiler, resulting in the consequences of tube explosion