The problem that should be paid attention to when the fire resistance and wear -resistant material construction

During the construction of refractory and wear -resistant materials, because the circulating fluidized bed boiler is different from the traditional coal flour boiler, the bed material in the furnace rises under the furnace, and the upper exit of the furnace enters the separator to perform gas in the separator. The solid two phases are separated, and the separated flue gas is exported to the upper part of the separator into the tail of the boiler. The solid particles that are separated are returned to the lower part of the furnace. Due to the operation of the circulating fluidized bed boiler, the solid bed material containing fuel, fuel gray, limestone and its reaction products, in the furnace of the furnace separator, one furnace, a furnace. During the flow, high-efficiency combustion and desulfurization reactions were performed at 850~900 ° C in the furnace. Except for the outer circulation in this circuit, the bed material is continuously circulating in the furnace under the action of gravity. Therefore, severe wear at the corresponding part of the circular circuit. The direct hazard caused by wear to the boiler is to reduce the thickness of the heating metal tube wall of the internal pressure until the overturning tube is stopped.

The following problems should be paid attention to refractory and wear -resistant materials:

(1) The contact surface of all metals and pouring should be painted as asphalt or wrapped in ceramic fiber paper.

(2) The gap between the hook tank of the hook bricks should be filled with mash.

(3) The slurry seam between all wear -resistant and refractory bricks should be <2mm.

(4) The mortar between each piece of wear -resistant and refractory tiles should be filled, and there should be no gaps. Otherwise, the flue gas will enter the gap during the boiler, which exacerbates the corruption or peeling in the resistance and refractory lining.

(5) Do not cut in principle when the masonry is wear -resistant and refractory brick. If you need to cut it, each brick must not be <1/2. When you cannot meet, you can use two pieces of cutting at the same time.

(6) All the bricks near the bottom of the push wound have their own hooks. On all the support brackets, the next layer of bricks should be long bricks and the expansion seams to form a overall stable furnace wall body.

(7) The mortar gap between all bricks should be applied to refractory mortar. All bricks should be built along the seam. If the brick angle or end surface is broken, the brick is replaced when the crack is cracking.

(8) Use the adhesive hammer or wooden hammer to tap the brick to make the brick tightly. Do not use the hammer.

(9) During the construction of wear -resistant and refractory castable materials, the amount of water increase should be strictly controlled. Generally, the amount of water adding is 68%. The stirring must be uniform. It is strictly forbidden to use over -standard water and water with suspension.

(10) The appliances used in the construction process must be cleaned without pollution, especially to avoid chemical pollution.

(11) The pouring materials are formed by applying a vibration engine during construction, and the vibration is uniform, and the vibration rod is slowly pulled out during vibration to avoid causing the pouring materials.

(12) Injecting the density of the refractory castable materials after the mold is described, and you can use a hammer to tap lightly. If a crisp echo is emitted, it indicates that the pouring body is dense. At the same time, honeycomb or hemp can not appear. If the area of the honeycomb and the hemp surface is large, the construction should be partially cut off.

(13) After the mold, the abrasion -resistant refractory castable lining is 57 days after the linage linings are kept at room temperature.