echemi logo
Product
  • Product
  • Supplier
  • Inquiry
    Home > Active Ingredient News > Drugs Articles > What is the structure principle of coal-fired hot blast stove

    What is the structure principle of coal-fired hot blast stove

    • Last Update: 2020-01-07
    • Source: Internet
    • Author: User
    Search more information of high quality chemicals, good prices and reliable suppliers, visit www.echemi.com
    There are many kinds and complete series of hot blast furnaces, which can be divided into two types: manual combustion and mechanical combustion by way of coal addition, coal, oil and gas furnaces by way of fuel type, high temperature furnace and medium temperature furnace by way of output air temperature, indirect type and direct type by way of transportation, combined type and separated type by way of heat exchanger arrangement, and burner of blast furnace hot blast furnace equipped with coal pulverizer on large-scale furnace is basically Are suitable for gas fuel combustion devices According to the combustion mode of gas fuel, it can be divided into flameless burner with premixed combustion, short flame burner with semi premixed combustion and long flame burner with diffusion combustion According to its structure, it can be divided into circular burner, rectangular burner, annular burner, and burner of other shapes According to the structure of combustion air flow, it can be divided into swirl burner, DC burner, offset burner, reflux burner and other combined flow field burners High air temperature, low investment and long life are the basic characteristics of modern hot blast stove The theoretical research and production practice show that the top burning hot blast furnace is an advanced hot blast furnace structure Adopting the top burning hot blast furnace structure, the thermal efficiency of the hot blast furnace can be improved, the equipment investment can be reduced, and the service life of the hot blast furnace can be prolonged Most of the hot blast furnaces with coal as fuel use indirect heat transfer to heat air In the process of indirect heat exchange, there are generally two situations, one is that the furnace is equipped with ventilation pipe, cold air goes through the pipe layer, and flue gas goes through the shell layer The heat generated by coal combustion radiates the outer wall of the tube, and the heat is transferred to the inner tube through the tube wall, and then heated with the cold air of the inner tube The inlet of the furnace is cold air, and the one from the other after heating is high temperature clean air The other is a coal-fired heat-transfer oil furnace After being heated, the heat-transfer oil flows to another heat exchanger (such as fin heat exchanger), and then exchanges heat with cold air The heat-transfer oil is recycled The characteristic of indirect heat transfer is the high cleanliness of hot gas In the process of heat exchange, there is no humidity change in the air, and the humidity of cold air is still maintained The structure of coal-fired hot blast stove is simple, and there are many ways to add coal Different heating methods are adopted according to the process needs or different heat exchange Due to the direct radiation of flame and heat exchange tube, there are corrosive chemicals such as sulfur in the flue gas, which have certain requirements for the materials in the tube This kind of hot blast furnace can be divided into high-temperature furnace and low-temperature furnace When the temperature of hot blast at the outlet is required to be above 300 ℃, the material of heat exchange tube shall be high-temperature and corrosion-resistant In addition, the operation path of the air in the tube should also avoid the existence of local high temperature in the heat exchange tube as far as possible, otherwise it will affect the service life of the hot blast furnace The coal is added by the coal hopper, the thickness of the coal seam is adjusted by the coal ram, and then it moves backward with the chain grate After preheating, combustion and other stages, the burned coal slag is discharged by the slag extractor at the rear Adjust the air volume of drum and induced draft fan to make the furnace burn under negative pressure After combustion, the high temperature flue gas (1100 ~ 1350 ℃) enters the heat exchanger, and the waste flue gas is discharged from the dust remover and the induced draft fan by the heat exchanger The integral structure hot blast furnace is equipped with flue gas recirculation fan Part of the waste gas from the heat exchanger is sucked out by the recycling fan and then poured into the furnace Its main function is to reduce the temperature in the furnace and increase the amount of smoke and halogen, which not only protects the heat exchanger but also strengthens the heat transfer Because the waste gas also has a certain temperature, the recycling fan also plays a role in waste heat recovery and energy saving The index reflecting the capacity of hot blast stove is the heat exchange or heat supply of hot blast stove Heat exchange refers to the heat exchange capacity of the hot blast stove, while heat supply refers to the heat supply capacity of the hot blast stove When the ambient temperature is below zero, the heat exchange is greater than the heat supply; when the ambient temperature is above zero, the heat exchange is less than the heat supply In engineering, the capacity of hot blast stove should be expressed by heat supply Because the heat supply is the pure output of the hot blast stove, that is, the heat required by the dryer.
    This article is an English version of an article which is originally in the Chinese language on echemi.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to service@echemi.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

    Contact Us

    The source of this page with content of products and services is from Internet, which doesn't represent ECHEMI's opinion. If you have any queries, please write to service@echemi.com. It will be replied within 5 days.

    Moreover, if you find any instances of plagiarism from the page, please send email to service@echemi.com with relevant evidence.