Detailed combustion process of coal produced by ball compactor in boiler
At present, the combustion methods of fuel coal in the furnace can be divided into three types: stratified combustion, suspension combustion, and boiling hunting combustion. With the development of industry. Boilers are increasingly widely used in all sectors of modern industry. From the perspective of large volume and wide area, in various industries except electricity. The main operation is small and medium-sized low-pressure boilers, of which the stratified combustion method is more common. The stratified combustion method is divided into: the fuel layer does not move, and the fuel layer moves on the furnace. The fuel layer and the grate move together. Suspension combustion and simmering combustion, except for using oil and gas (the latter uses coal), solid coal should be crushed into particles of a certain size, or particulates, and briquettes should not be used. The above-mentioned several combustion methods, especially the stratified combustion method, are more serious in the waste of coal and the dyeing environment. For this reason, some European and American countries. In addition to the use of advanced boilers, the following factors should be considered in the use of briquette boilers before the 1950s.
(1) Compressive strength: Because its material layer is not as good as blast furnace, iron furnace and gas furnace, the strength can be slightly lower. However, it burns under external force such as strong blowing, coal addition and collision friction on the grate. Still need to have some compressive strength.
(2) In order to keep the output and heat supply of the boiler stable, the coal used in the boiler should be easy to catch fire. Therefore, the volatile matter in the coal should be 15-20%. But it has a great relationship with the furnace type. For example: The boiler hearth contains a grate, which has a small status and the heating surface is close to the grate. Do not use too many fluted objects. Bituminous coal that burns too fast; if the boiler furnace is large and there are fire bricks in the middle to make the air come to the stage, bituminous coal with a large volatile content should be used. This should be paid attention to power coal blending and briquette coal blending.
(3) The physical properties of coke formed by different coals are different, such as non-coking coal, whose coke is powder; weak coking coal, whose coke is loose; strong coking coal, whose coke is a hard block, trapped in a layer burner When burning coal, non-coking coal is easy to form coke, which is blown away by the wind and taken away by the flue gas. At the same time, powdery coke is also easy to fall into the ash pit from the grate hole; strong coke coal may form The solid coke block makes the porous material piled up by loose coal disappear, and the internal particles of the coke block are difficult to contact with the air. It makes it difficult to burn because of the poor permeability of coal seams. Causes incomplete combustion. The coke of the weakly coked coal is loose, and it is easy to be pulverized once it is stirred, and it will also affect the air permeability and lead to incomplete combustion. (Net) There are two types of slag formed when coal is burned in bulk (Note: the above is coke). One type is hard slag, which is formed by melting mountain ash, so it forms small slag and falls into the ash bucket (pit); the other is soft slag, which is softened into molten state.
(5) With the water vaporization station, sulfurous acid and sulfuric acid will be generated, and it is easy to condense on the heating surface of the boiler to corrode the metal, so the coal with high sulfur content is not suitable for boiler use. Various disadvantages mentioned above. It is almost inevitable when coal is scattered. Although power blending can adjust some of its resistance, it can be used in different boilers. But: it can't change its scattered burning. If the mixing table is not uniform, different parts of the furnace will have different thermal changes.
The above information comes from Zhengzhou Dongfang Heavy Industry ( http://bjkrui.com
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