Construction detail management of vertical environmentally friendly lime kiln
The construction of vertical environmentally friendly lime kilns should be carried out with a refined concept throughout the entire process, ensuring that equipment performance and environmental indicators meet standards through detailed control. The following elaborates on the key points of construction detail management from key aspects:
Management of refractory material masonry
After entering the site, refractory bricks are stored in designated areas according to specifications, with wooden blocks at the bottom to prevent moisture and avoid mixing different materials. Before masonry, conduct ultrasonic testing on the bricks to remove any hidden cracks. Adopt the "Three One" bricklaying method (one brick, one shovel of mud, one kneading and pressing) to ensure that the mortar fullness is ≥ 95%. During the construction of the arch crown, a curvature template should be set up, and the radius deviation should be checked three times for each ring, with an error controlled within ± 5mm. Expansion joint filling adopts segmented construction, and after each layer is filled, it is lightly compacted with a wooden mallet to prevent later settlement.
Equipment installation accuracy control
The installation of the supporting wheel group uses a laser alignment instrument to control the parallelism error within 0.03mm/m. The connecting bolts between the large gear and the cylinder are tightened symmetrically in three stages, with a final torque deviation of ≤ 5%. Before installing the hydraulic system pipeline, acid pickling and passivation treatment should be carried out. During welding, argon arc welding should be used as a base to ensure that the inner wall cleanliness reaches NAS6 level. Pre shrinking treatment should be carried out before installing the dust collector bag, and the verticality deviation of the bag cage should be ≤ 0.5% of the total length.
Integrated debugging of environmental protection system
After the installation of the spray layer in the desulfurization tower, a water flow distribution test shall be conducted to ensure that the flow deviation of any nozzle is ≤ 8%. The sampling pipeline of the online monitoring equipment adopts heat tracing insulation, and the temperature is controlled at 120-150 ℃ to prevent condensation. During system linkage debugging, record the correspondence between the frequency of the induced draft fan and the negative pressure inside the kiln, and establish a dynamic adjustment model. The final acceptance requires continuous operation for 72 hours, with a stable dust emission concentration of below 8mg/m ³ and a nitrogen oxide concentration of ≤ 90mg/m ³.
