Furnace lining construction management and technical quality measures 1, optimize design.
Before the construction of the boiler lining, organize a professional construction team to review the drawings in time and optimize the design of key parts.
2. Precautions after the installation is completed.
The installation of the steel structure, heating surface, furnace wall metal parts and other devices of the construction site (including the tightness inspection, wind pressure and water pressure test of the weld installed in the manufacturing plant and the site) is qualified, and the process handover procedures are in place. All temporary metal components (such as tension ribs, supports, etc.) that have an impact on the construction of the furnace wall or are not dismantled after construction should be removed to avoid local damage to the wear-resistant and refractory pouring layer caused by the expansion stress of the metal parts at high temperature.
3. Construction site conditions.
The total power supply is connected to the power box of each layer of the boiler, and a 10m3 water storage tank is arranged on the top of the boiler to ensure the uninterrupted water source during the pouring construction. All construction materials are transferred to the assembly yard by containers. The road is smooth to ensure that the material truck can reach the elevator entrance from the combination yard. A total of 4 material stacking and mixing processing sites are set up in the boiler separator outlet flue, separator inlet flue, return valve and boiler 12 floors to ensure the continuity of construction materials.
**10,000 powder incentive plan 4, construction technology and quality assurance measures.
Construction technology and requirements of each part:
1) Dense phase zone in the lower part of the furnace. When the boiler is running, the flow conditions of gas and solid phases inside the furnace are extremely complex, the material concentration in the lower area of the furnace is very high, and a large number of mixed materials seriously erode the surrounding wall, in order to prevent the wear of the heating surface in the area, the area to the water-cooled air distribution board around the water-cooled wall needs to be abrasion-proofed: the furnace dense phase area (unopened area) is designed as a single-layer chromium corundum wear-resistant castable + steel fiber, with a thickness of 80mm (self-tube center); The dense phase area (open area) of the furnace is designed as a special wear-resistant refractory castable + steel fiber, with a thickness of 80mm (self-tube center).
2) Cloth air board at the bottom of the furnace. The lining material requirements in this area: the water-cooled air distribution board is composed of a membrane wall composed of pipes and flat steel connecting the slightly inclined pipes of the water cooling walls on both sides and a large number of air distribution pipes welded on the flat steel. In the operation, new fuel and limestone are constantly sent into the furnace, and the return material of the return valve and the backmixing of a large number of materials in the bed make the air distribution board be eroded by a large number of high-temperature bed materials.
3) Water-cooled cyclone separator. The use of steam-cooled cyclone separator, cyclone separator is the most important component of circulating fluidized bed boiler, its performance directly affects the performance of the boiler, the working temperature of the separator barrel part is about 900t, the flue gas velocity is high (25m s), the ash concentration is high, the wear is serious, especially the target area (inlet arc direction is about 120 ° range) is more serious, the target area of the cyclone separator is made of silicon carbide wear-resistant castable + steel fiber, thickness 60mm (self-tube center); The non-target area of the separator cylinder is made of chromium corundum wear-resistant castable + steel fiber, with a thickness of 60mm (self-tube center); The cone section and the top of the separator are made of chrome corundum plastic, with a thickness of 60mm (self-tube center); The membrane wall at the outlet of the central cylinder of the separator is made of self-flowing corundum castable + steel fiber. The separator construction can be a plastic area, and the ramming method is used for construction, and ultra-thick layering must be avoided.