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

Abstract

The invention relates to an additive product suitable for coal-fired boilers in electric power, thermal power, petroleum, chemical and metallurgical industries, specifically a boiler chromium-based slag-removing, ash-removing and coal-saving agent composition, which consists of the following parts by weight Several raw materials: 50-65 parts of chromium trioxide, 8-15 parts of copper oxide, 5-9 parts of cerium oxide, 5-9 parts of barium molybdate, 7-14 parts of cobalt oxide, 12-12 parts of potassium permanganate 17 parts, 10-16 parts of manganese carbonate, 12-17 parts of barium 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, 20-28 parts of sodium carbonate, 25-35 parts of activated attapulgite clay and 0.1-0.3 parts of alkyl glyceryl ether sulfonate. The invention is an environmentally friendly product with high combustion-supporting efficiency, high coal-saving rate, reduced pollution, improved combustion efficiency, and extended boiler service life; it is easy to use, has stable performance, and does not need to modify equipment, only needs to be added to fuel to participate in combustion.

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, in particular to a boiler chromium-based slag-removing, ash-removing and coal-saving agent composition used in coal-fired boilers. The invention also relates to a preparation method of the boiler chromium-based slag-removing, ash-removing and coal-saving agent composition. Background technique [0002] Due to the unreasonable regional distribution of coal in my country and the large differences in the nature of coal combustion in different regions, slagging on the water-cooled tube wall on the high-temperature heating surface of coal-fired boilers, around the four-corner burner, and ash accumulation in the superheater system are caused. These slagging and ash accumulations are extremely harmful. The main hazards of the normal safe and economical operation of the boiler a...

AI Technical Summary

Problems solved by technology

[0003] (1) Soot and slagging will reduce the heat transfer efficiency of the heating surface in the furnace. The thermal conductivity of the slagging and slagging layer deposited on the heating surface is very small, only 1 / 400 of the heated metal surface, and the thermal resistance is very low. Large, so that the heat transfer capacity of the water-cooled wall will generally decrease by 30% to 60% after a few hours of contamination, causing the center of the flame in the furnace to move back, and the temperature of the smoke at the furnace outlet to increase, reducing the thermal efficiency of the boiler

[0004] (2) The slagging and coking on the heating surface of the coal-fired boiler are serious, which may eventually cause the boiler to shut down and require manual coke removal

[0006] (4) Due to the slagging and ash deposition on the heating surface in the furnace, the flue gas temperature at the furnace outlet rises accordingly, which makes the fly ash easily stick to the panel and convection superheater, causing high-temperature cohesive ash deposition and corrosion of the superheater , block the flue gas channel, causing heat transfer deterioration

Coking and slagging cause incomplete combustion of coal in the boiler, and CO and SO in the smoke 2 Elevated content will seriously pollute the environment

[0007] (5) Low-temperature ash deposition will cause the blockage of the economizer and the air preheater and the significant decline in the heat transfer effect, thereby increasing the exhaust gas temperature of the boiler, increasing the heat loss, and reducing the economical efficiency of the boiler operation

On the one hand, it increases the power consumption of the fan; on the other hand, it causes slight positive pressure operation, aggravates the leakage of flue gas, and seriously affects the normal operation of the boiler; at the same time, it causes environmental pollution and affects safe production

[0008] (6) Due to the increase of the total heat transfer resistance of the heating surface of the boiler, the boiler may not be able to maintain the operation at full load, so the amount of coal combustion has to be increased, which will further increase the temperature of the flue gas at the furnace outlet, making the fly ash more likely to stick On the heating surface, a vicious cycle is caused, leading to a series of boiler accidents, such as clogging of superheater and economizer tube bundles, deterioration of heat transfer and tube burst, large air leakage of air preheater, blockage and failure of slag discharge system

[0009] (7) As the temperature of the flue gas at the outlet of the furnace rises, the temperature of the superheater is relatively high, and the heating surface of the high-temperature superheater forms a local overtemperature, which causes the metal strength to decrease and a tube burst accident occurs

[0011] (1) The increase of the furnace outlet smoke temperature and exhaust gas temperature will reduce the output and efficiency of the boiler. According to the statistics at home and abroad, the average efficiency of the boiler will be reduced by 1% to 2%, and the coal consumption will be increased;

[0012] (2) Due to slagging and ash deposition, the total heat transfer resistance of the boiler heating surface increases, and the boiler can only operate at low load. When the slagging is serious, the boiler can only operate at 50% load, and is often forced to stop furnace;

[0013] (3) Dust accumulation and slagging bring hidden dangers to the safe operation of the boiler. If necessary, the boiler needs to be shut down for maintenance, which will cause economic losses due to less power generation. According to statistics, a 500MW unit will lose 10000 yuan per day when the boiler is shut down. More than ten thousand US dollars;

[0014] (4) It is necessary to arrange a sufficient number of soot blowers, ranging from a dozen to as many as dozens, which significantly increases the investment cost of the unit; in addition, it also needs to increase a large number of maintenance costs, such as slag removal and replacement of heating surface pipes etc.