Stain-resistant additive for boiler as well as preparation method and application of stain-resistant additive

Abstract

The invention relates to a stain-resistant additive for a boiler as well as a preparation method and application of the stain-resistant additive. The additive is prepared from the following components in parts by weight: 15 to 25 parts of tungsten ore, 10 to 20 parts of coal gangue, 20 to 30 parts of bauxite, 5 to 15 parts of chromite and 25 to 35 parts of aggregate. Compared with the prior art, the stain-resistant additive disclosed by the invention has the advantages that on the premise of not changing the structure of the boiler and operation conditions of the boiler, a melting point of easily-stained fuel ash can be effectively improved, the caking property of the easily-stained fuel ash is reduced, the problems of slagging and ash deposition of a fired easily-stained fuel boiler are remarkably reduced, the heat transfer effect of a heat exchange tube is enhanced, the flue gas loss of the boiler is reduced, and the efficiency of the boiler is improved; ventilation power consumption is reduced, and power for factories is saved; the risk that slagging affects normal work of steam and water inside the heated surface is effectively reduced, and the condition that a steam-water pipe bursts due to overheat is prevented; and corrosion of slagging to the metal tube wall is reduced. The invention aims at solving the problems of the slagging and the ash deposition of easily-stained fuel and the application range of the boiler to the easily-stained fuel is widened.

Description

technical field [0001] The invention relates to the technical field of boilers, in particular to a boiler anti-contamination additive and its preparation and application. Background technique [0002] The energy structure with more coal, less gas, and less oil determines that coal will remain the dominant energy source in my country for a long time to come. Thermal power plants are undoubtedly large consumers of coal, a considerable part of which is low-rank coal. When boilers burn low-rank coal, it is easy to cause serious ash accumulation and slagging. Because the dust has a much larger thermal resistance than the metal wall, it reduces the heat transfer effect, increases the boiler exhaust smoke loss, reduces the boiler efficiency, and increases the ventilation power consumption. At the same time, due to the locality of slagging, it affects the normal operation of steam and water inside the heating surface. Severe slagging will block the flue gas passage and furnace sla...

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Problems solved by technology

[0003] At present, there are many kinds of anti-fouling additives, which can be divided into three categories according to the main components of the additives: anti-fouling additives mainly based on kaolin, such as patents CN 102786998 A, CN 104371790 A, CN 104327903 A, although the effect is good, the dosage is large, High freight, slow effect, poor fuel adaptability, kaolin's combined water evaporation and heat absorption will reduce boiler efficiency; 2 o 3 , oxidant, and adsorbent are chromium-based anti-fouling additives with main components, such as patents CN 104845698 A, CN104910996 A, and CN 103060051 A. Although the onset of effect is fast, the effect is general and the fuel adaptability is poor, so it is difficult to popularize; 2 o 3 Pure substances and SiO 2 Pure substance-based oxide anti-fouling additives, such as patents CN 104371789 A, CN104745270 A, CN 104164270 A, although the effect is good, the cost of raw materials is high and the fuel adaptability is poor

Although the above three types of anti-fouling additives have their own advantages, the disadvantages of large dosage, high freight, slow effect, and poor fuel adaptability have greatly restricted their application range, and it is difficult to achieve real promotion.

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