Thermal design drawings and parameter analysis of shaft kiln lime kiln
Lime kiln is the main equipment for lime production, and its performance is directly related to the quality and output of lime. As one of the earliest lime kilns, shaft kiln is still one of the main kiln types for lime production.
Basic structure and design drawings of shaft kiln lime kiln
Shaft kiln is usually composed of kiln body, charging and discharging device and ventilation equipment. The kiln body is the main part of the shaft kiln, with large height, large floor area and strong adaptability to raw materials. The charging and discharging device is used to add limestone raw materials from the top of the kiln and discharge the products from the bottom of the kiln. The ventilation equipment is responsible for the gas flow and heat exchange in the kiln.
The following is a brief introduction to the CAD design drawings of a 2x150t/d active lime shaft kiln:
Elevation: it shows the overall height and structure of the shaft kiln, including the design of the thermal insulation layer and lining brick of the kiln.
Plan: the plan layout of the shaft kiln is shown in detail, including the layout of feeding and discharging devices and ventilation equipment.
Detail view: shows the local structure of the shaft kiln, such as the detailed design of the kiln body, thermal insulation materials and sealing structure.
The design drawings are drawn with AutoCAD software, the drawing version is AutoCAD2004 or higher, and the file format is DWG. The drawing contains editable parameters for easy adjustment and Optimization in the design and production process.
Parameter analysis of shaft kiln lime kiln
The selection of parameters of shaft kiln lime kiln has an important impact on the quality and output of lime. The following is a detailed analysis of key parameters:
Kiln type: shaft kiln is one of the earliest lime kilns, which has the advantages of simple structure, convenient operation and strong adaptability to raw materials. For small lime production enterprises in mountainous and hilly areas, shaft kiln is more suitable.
Kiln diameter and kiln length: the larger the kiln diameter, the more raw materials processed per unit time, but the more difficult the temperature distribution and material distribution in the kiln. The longer the kiln, the longer the calcination time of lime, and the better the product quality, but the energy consumption and floor area also increase accordingly. In the actual design, the kiln diameter and length should be determined according to the production scale and the nature of raw materials.
Calcination temperature and time: calcination temperature and time are the key factors affecting the quality of lime. If the calcination temperature is too high or the calcination time is too long, it will lead to the over burning of lime and reduce its activity; If the calcination temperature is too low or the calcination time is too short, the lime will be burnt and its use effect will be affected. Therefore, the calcination temperature and time should be reasonably controlled according to the properties of raw materials and product requirements.
Fuel consumption: fuel consumption is an important indicator to measure the economic performance of lime kiln. The shaft kiln usually uses coke, gas, natural gas or heavy oil as fuel. The amount of fuel consumption is closely related to kiln type, kiln diameter, kiln length, calcination temperature, calcination time and raw material properties. In practice, attention should be paid to improving the sealing performance and heat exchange efficiency of the kiln body to reduce fuel consumption and environmental pollution.
Advantages and disadvantages of shaft kiln lime kiln
The shaft kiln lime kiln has the advantages of simple structure, convenient operation, strong adaptability to raw materials, low energy consumption per unit product, less investment, quick effect and so on. However, the shaft kiln also has some inherent shortcomings, such as large height, large floor area and limited production scale; Limestone raw materials are added from the top and products are discharged from the bottom, so special feeding and ash discharging equipment need to be set up, which increases the construction investment and operation cost; The distribution of materials in the kiln is not easy to be uniform, and the temperature fluctuates greatly, resulting in unstable product quality; The gas flow direction in the kiln is single, and the heat exchange efficiency is not high; Shaft kiln production belongs to intermittent operation, with low degree of automation and high labor intensity.
Environmental protection and energy saving trend
With the increasingly stringent environmental regulations and the increasing demand for high-quality lime in the market, the design and operation of lime kiln are facing higher and higher environmental protection requirements and product quality requirements. The design and operation of shaft kiln lime kiln will pay more attention to environmental protection and energy conservation, and adopt advanced combustion technology, heat exchange technology and dust removal technology to reduce energy consumption, reduce pollutant emissions and realize green production.
As one of the main equipment for lime production, shaft kiln has the advantages of simple structure, convenient operation and strong adaptability to raw materials. However, the shaft kiln also has some inherent shortcomings, such as limited production scale and low degree of automation. In the process of design and operation, it is necessary to comprehensively consider various factors, reasonably select kiln type, kiln diameter, kiln length and other parameters, and strictly control the calcination temperature and calcination time, so as to achieve high quality, high output and low energy consumption production of lime. At the same time, it is also necessary to pay attention to the improvement of the sealing performance and heat exchange efficiency of the kiln body, so as to reduce fuel consumption and environmental pollution. In the future, the design and operation of shaft kiln lime kiln will pay more attention to the development of environmental protection, energy saving, large-scale, automation and other aspects, so as to meet the market demand for high-quality lime.
