What should be noted in the construction plan of mechanical fossil ash kilns
The construction plan of mechanical fossil ash kiln needs to coordinate the multidimensional elements of process, equipment, environmental protection and safety. The core precautions are as follows:
Kiln type and process adaptation
Select a parallel flow heat storage or gas flow kiln type based on the characteristics of the raw materials (particle size, impurity content), and match it with a three-stage process of preheating calcination cooling. The mechanized system needs to be equipped with an automatic feeding machine, a chain grate feeding device, and a hydraulic ash discharge machine to ensure the stability of the material layer (thickness of 400-600mm). When designing double or multi chamber structures, it is necessary to reserve a kiln body thermal expansion compensation device.
Equipment integration and automation
Select a PLC control system to integrate fuel delivery, combustion air regulation, and kiln body speed control. Configure infrared thermometer and gas analyzer to achieve real-time monitoring of calcination zone temperature (950-1150 ℃) and CO concentration. Automation instruments need to have dust-proof and explosion-proof certification, and the control room needs to be independently set up and equipped with UPS power supply.
Environmental Protection and Safety Enhancement
Plan a collaborative system of bag dust removal and wet desulfurization to ensure that particulate matter is ≤ 10mg/m ³ and SO ₂ is ≤ 50mg/m ³. Emergency explosion-proof valves are installed on the kiln roof, and flame arresters are installed on the fuel pipelines. The safety interlock system needs to cover working conditions such as kiln body overheating and abnormal kiln pressure, and be linked with the fire sprinkler system.
Key points of construction and commissioning
The masonry of refractory materials needs to be baked in layers (with a temperature rise of ≤ 30 ℃/day in the first week) to avoid cracking. Conduct foundation settlement observation before equipment installation, with accuracy error controlled within ± 2mm. During the trial production phase, a step-by-step feeding method is adopted, gradually increasing the design capacity to 80% and then operating stably for 72 hours.
Capacity elasticity and operation and maintenance planning
Reserve 15% -20% equipment redundancy to adapt to future capacity upgrades. Plan a circular maintenance channel (width ≥ 1.5m) equipped with a mobile maintenance platform. Establish a spare parts inventory warning mechanism, and ensure that the reserve of key refractory materials meets the needs of three kiln shutdowns for maintenance.
By scientifically planning equipment layout, strengthening intelligent monitoring, and strictly controlling construction accuracy, it is possible to ensure the continuous and stable operation of mechanical fossil ash kilns, increase production capacity by more than 30%, and meet ultra-low emission requirements.
