Boiler chromium-based slag-removing coal-saving agent composition and preparation method thereof

Abstract

The invention relates to an additive product suitable for coal-fired boilers in industries such as electric power, thermoelectricity, petroleum, chemical industry and metallurgy; in particular, it is a boiler chromium-based slag-removing coal-saving agent composition used in coal-fired boilers, which consists of Composition of the following components and parts by weight: 50-65 parts of dichromium trioxide, 8-15 parts of copper sulfate, 5-9 parts of cerium oxide, 5-9 parts of barium molybdate, 7-14 parts of cobalt carbonate, high manganese 12-17 parts of potassium chloride, 10-16 parts of manganese oxide, 12-17 parts of potassium carbonate, 8-15 parts of titanium dioxide, 15-20 parts of zinc oxide, 6-10 parts of potassium chlorate, 6-10 parts of potassium perchlorate, 20 parts of sodium carbonate ~28 parts, 25~35 parts of activated attapulgite clay and 0.1~0.3 parts of lignonaphthalenesulfonate. It is a high-tech energy-saving and environmental protection product with high-efficiency combustion-supporting, high coal-saving rate, reduced pollution, improved combustion efficiency, and extended boiler service life; the water-cooled wall pipes of the furnace and the old coke body of the surrounding gas injection will be detached within 3 to 5 days; The newly generated coke slag will fall off automatically and periodically.

Description

technical field [0001] The invention relates to an additive product suitable for use in coal-fired boilers in industries such as electric power, thermoelectricity, petroleum, chemical industry and metallurgy; specifically, it is a boiler chromium-based slag-removing coal-saving agent composition used in coal-fired boilers. The present invention It also relates to a preparation method of the boiler chromium-based slag-removing coal-saving agent composition. Background technique [0002] With the rapid development of my country's socialist market economy, more and more boilers are produced and used. Industrial boilers are indispensable heat source equipment for the national economy and the people's livelihood. They are not only large coal consumers, but also a large source of air pollution. According to statistics, my country now has more than 500,000 boilers, and the types of coal used in boilers are also very complex, with a wide range of production areas and different advan...

AI Technical Summary

Problems solved by technology

[0003] (1) The thermal conductivity of the boiler heating surface is very small due to coking and slagging, which is only 1 / 400 of the metal on the heating surface, so that the thermal resistance increases significantly, the heat transfer condition deteriorates rapidly, the exhaust gas temperature rises, and the thermal efficiency of the heat conduction boiler Decrease, affect waste heat boiler output

[0004] (2) Serious slagging and coking will eventually cause the boiler to shut down and manual coke cleaning

For example, the data show that sulfur is easy to directly react with carbon steel at 350-400°C to form ferrous sulfate, forming high-temperature corrosion, and above 450°C, its damage to the furnace tube is more serious, and ferric sulfate is acidic and easily Moisture absorption, after the furnace is shut down to cool down, it begins to absorb moisture and deliquescence, forming a strongly acidic corrosive environment on the heating surface, causing the boiler heating surface to be damaged by dilute acid corrosion during the shutdown period

[0006] (4) Coking and slagging cause incomplete combustion of coal in the boiler, and CO and SO in the smoke 2 Elevated content, serious pollution to the environment

[0007] (5) Coking reduces the cross-sectional area of ​​the flue gas flow, increases the flow resistance, and significantly increases the positive pressure of the furnace

Some manufacturers have adopted this technology successively, which can reduce the amount of fly ash in the flue gas and improve the thermal efficiency of the boiler. However, the auxiliary system of the boiler needs to be transformed, which requires a large investment, but it cannot solve the coking problem. Recently, a sonic cleaner method has also appeared to deal with it. Coking problem, but the effect is not ideal

In order to remove the slagging in the furnace, special equipment such as a soot blower is used to blow the soot on a regular basis, which can remove the loosely deposited ash on the heating surface. However, the slagging of the fuel has both physical and chemical effects. High strength, with unlimited growth characteristics, difficult to remove by mechanical means

[0011] In recent years, in Hebei, Liaoning, Shaanxi and other regions, boiler slag remover and coal-saving agent products have been developed and tested in coal-fired boilers. Although some have effects, the effect is not obvious; some form glass bodies after being added to the furnace. Not only can't remove the coke, but make the coke more firmly