What is the nature of the lime kiln's industry

Summary of Steel Metallurgical Lime Kiln New Technology Summary of Lime Kiln New Technology

. The significance of developing new technologies lime kiln is now developing new technologies
The steel industry, electric stone industry, alumina industry, refractory materials and other industries are large lime consumption. In the past two years, these industries are high -speed development industries. The annual output is basically increased at a rate of more than 20%. But the main materials (auxiliary materials) they need did not grow accordingly, so they caused the tension of lime, which stimulated a large number of malls of the earth and lime kiln in society. In this case, the state and local governments have successively introduced a policy and regulations for the rectification of soil -burning kiln, but it is difficult to achieve the expected results because there is a stimulus of demand. Therefore, in order to control the pollution of soil -burning kiln, modern new technology lime kiln must be implemented to solve the problem of demand. The so -called modern new technology lime kiln is a modern lime kiln with environmental protection, energy conservation functions and mechanization, and automation. Because of the adoption of modern technology, it can make full use of cheap energy, and it can use the main energy sources of gas that was originally polluted by the environment and turned waste into treasure. This not only can protect the environment, but also the lime produced not only good quality but also low cost. For enterprises that use this new technology, economic benefits will increase significantly. This is the practical significance of promoting new technologies lime kiln.
. The type of new technology lime kiln
This is divided into mixed kiln according to fuel, namely burning solid fuel, coke, coke powder, coal, etc. And gas fur. The gas -burning kiln includes burning furnace gas, coke furnace gas, gas tail gas, furnace gas, natural gas, etc. According to the kiln, there are vertical kiln, rotary kiln, sleeve kiln, West Devomaster kiln, Melz kiln (Switzerland), Forda kiln (Italy) and so on. At the same time, there are head -up operation kiln and negative pressure operation kiln. The Linzhou Modern Technology Center developed and designed a mixed -fired kiln below 300 cubic meters and gas -fired kiln below 140 cubic cubic cubic cubic meters, especially the XD -type energy -saving and environmentally friendly lime kiln of the blast furnace gas and coke furnace gas. The problem of having high thermal value and short flames of coke furnace gas can make the remaining coke oven gas be fully utilized. From the original "light light" of the coke furnace gas, the pollution environment has become a valuable energy source to create benefits for the enterprise. It is a very good way for small and medium -sized steel enterprises, coking enterprises, electric stone enterprises, and refractory materials industries.
. The basic principles of lime and thermal process
The main components of lime stones are calcium carbonate, while the limestone components are mainly calcium oxide. The basic principle of firing lime is to decompose calcium carbonate in lime stones into calcium oxide and carbon dioxide raw lime. Its reaction formula is
CACO3 CAO CO2 —— 42.5kCai
. its process process is, lime and fuel loaded into lime kiln 850 ° C began to decompose, completed the burning until 1200 degrees, and then cooling out the kiln. That is to complete the production of lime products. Different kiln shapes have different preheating, burning, cooling and ash way to remove ash. However, there are several technical principles that are the same: high quality of raw materials, good lime quality; high fuel thermal value, small amount consumption; limestone particle size and burning time proportional; lime's activity and burning time, the burning temperature is inverse proportional.
. The basic structure and main affiliated equipment of the limestone kiln
The lime kiln is mainly composed of kiln body, feed device, fabric device, combustion device, ash unloading device, electrical appliance, instrument control device, dust removal device, etc. Different forms of lime kilns are different from the form of burning, and the process process is basically the same, but the equipment value is very different. Of course, the effect of use must be different.
. The quality and quantity of limestone are consumed
The quality requirements for lime for lime for industrial use: First, the content of calcium carbonate is required, and generally requires above 97%. The second is that its structural grains should be small, because the small lime crystal of the grains is not strict, and when the organic matter is contained, the porous shape formed by the combustion of organic matter is easy to separate the carbon dioxide, so it is easy to burn. Third, there are less impurities, less harmful ingredients such as silica, magnesium oxide, aluminum oxide, iron oxide, sulfur and phosphorus. If these ingredients are one percent of the lime stones, it is eighteen percent of the lime that is burned into the burnt. Burning a ton of lime is calculated by theoretical calculations
1.78 tons of limestone, but the height of "raw" and "excessive" burning at the time of burning is also different from the quality of lime stone.
. The quality standard of lime:
The general standard for lime quality is: calcium oxide content, raw, overburing rate, activity, harmful ingredient content, etc., but the heavier is different industries, and different purposes are different. standard. For example, the electric stone industry emphasizes the vitality, that is, soft ash, and the ironmaking industry emphasizes strength, so it is necessary to burn ash, and steelmaking must be soft. So its indicators are different. Generally, standard lime, calcium oxide content is more than 97%, the burning rate is less than 10%, and active calcium requires more than 300mi.
seven. Energy -saving and environmentally friendly lime kiln fuel and combustion
This lime fuel is wide, and solid fuel, gas fuel, and liquid fuel are available. It is conducive to environmental protection, and those fuels can better save energy is the key to new technology lime kiln. The general use of coke and gas is mainly used now. For new technologies, the most ideal is gas, including the hybat gas, the gas, the gas, the coke furnace gas, and the gas tail gas (gas). Because these gas fuel belongs to waste use and circular economy. Especially like coking furnace gas, most of them are dispersed now, and the resources are very rich. The second is the blast furnace gas, and then the gas tail gas. If these gas can be used, it can save a lot of energy. Second, the environment can be protected. More importantly, enterprises can Receive good economic benefits. If these gas -burning lime kilns are developed in large quantities, the problem of the pollution environment of the burning kiln will naturally solve it.现在为什么如此好的项目为什么发展缓慢，主要是气烧石灰窑技术在我国发展起来时间还比较短，任何事务都有一个发展认识的过程.特别是焦炉煤气，由于热值高、火焰短、 Lime kiln is easy to burn and burn. As a result, some companies dare not use it boldly. In fact, this is not a problem that is too difficult to solve. Linzhou Modern Technology Center has now studied the manufacture of outer mixed long flame burning, and the lime kiln self -looped high thermal gas technology. It can completely solve the problem of lime burning of coke oven gas. The amount of lime fuel is related to its furnace type and the thermal value of fuel.的 The heat required to burn lime is obtained from the burning of fuel. The main component of the fuel. The molecular formula of the carbon combustion process is C O2 = CO2 gas fuel calculated based on its thermal value. It takes about 960kcal calories to produce a kilogram of lime according to actual experience. However, due to the different production equipment and process conditions of each factory, there are also differences. Generally speaking, it takes about 1600m3 to burn a ton ash gas, and about 300m3 of the burnt furnace gas. The gas tail gas requires about 360m3, the natural gas needs about 120m3, and the gas gas requires about 900m3.
eight. The fabric, burner and other auxiliary equipment of the lime kiln
The main affiliated equipment of the limestone kiln include the feed mechanism, the fabric, the wind device, the combustion device, the asylum device, etc. It is very important because when it is installed in the kiln at the same time, it must achieve the reasonable distribution of the furnace material in the kiln through the fabric, eliminate the effect of the furnace wall, balance the resistance in the furnace, and strive to be uniformly consistent with the entire furnace section. Therefore, the form and use effect of the fabric have a great impact on the production efficiency of the lime kiln. There are all kinds of fabrics, including rotating fabrics, conch -shaped fabrics, fixed fabrics, etc. Among them, the three -segment bell fabrics developed by Linzhou Modern Technology Center use "funnel throat effects" and "inverted W pile collection" The method of combining the principle of angle effects and the adjustable gear board is simple. The structure is simple to solve the problem of solving the uniform mixing of the raw fuel and the reasonable distribution of the size of the size. And it has various advantages such as high temperature resistance, wear resistance and convenient maintenance. It is particularly suitable for small and medium -sized lime kiln configuration. The main subsidiary equipment of Qi Burning Kiln is a burner, because its gas fuel is to mix the combustible gas and the required oxygen (air) in a certain proportion through a burner. It is later sent to the furnace and burned, and the amount of air required for different gas is different. Different furnace types, different heating methods, the types of flames they need are different. Such as premix, semi -mixed, outer mixing and oxidation flames, neutral flames, reducing flames, and so on. Therefore, the burner of the gas firing kiln determines the burning effect of the lime kiln to a certain extent. Of course, other auxiliary equipment is also very important. It is simple to see the hats, but it must be ensured that the distribution of air volume in the kiln on the kiln provided by the kiln has a good effect.
. Selection of lime kiln and wind turbine
While mixed kiln or gas -fired kiln requires a certain reasonable supply of wind, because any fuel combustion must have three conditions, namely fuel, air (oxygen), and Minghuo, and Minghuo. No one condition will not burn. The amount of wind is calculated based on the amount of oxygen demand for the combustible ingredients of the fuel. If the supply of wind is not fuel, it will not be sufficiently fuel, and excessive air excess air will become a large amount of heat in flue gas, which will increase and waste the fuel from the surface. Its air volume is generally calculated according to the following formula: (Calculating the formula slightly) Its pressure should be calculated based on different kiln types and different resistance formed by different raw materials. Generally speaking, the resistance of the Li Kiln can be calculated according to
40 —0 H2O/ effective height (m)
formula. However, there are differences in the granularity of the original fuel. Therefore, the use of fans must be based on the basis of theoretical calculation and based on specific furnace type and actual experience. In order to have good use effects.
. The dust removal and environmental protection of the lime kiln
This, the dust discharged by lime contains a large amount of harmful gases and dust below 10 microns, and the dust contains SO2; F2O3; AIO3, etc. These harmful gases and dust are very harmful to the human body. If people inhale for a long time will cause respiratory diseases such as bronchies and lungs, children are more serious, and the dust floating in the air also contains carcinogens. The harmful dust of more than 150mg/m3 causes fatal harm to the human body. The main advantage of new technology lime kiln is that in addition to low energy consumption, high yield, and good quality, the biggest benefit is to facilitate dust removal. Because its entire burning process is equivalent to performed in a seal container, its flue gas can be discharged from the daisy pipeline of the kiln, purifying through dust removal, and then reaching harmless and non -pollution -free discharge. eleven. Automation control
If automation control is an important feature of new technologies lime kiln. Its materials, ingredients, wind supply, gas supply, and ash removal are all completed by computer automation control. However, it is also necessary to consider national conditions, factory conditions, and value costs, and the higher the degree of automation, the better. It should be based on the principle of the final effect.