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影响生物质热风炉燃烧过程的变量有哪些

2018-10-26 18:03:17 常州市星火铝艺制品有限公司 阅读

燃油热风炉--专业生物质热风炉生产厂家,今天提供 影响生物质热风炉燃烧过程的变量有哪些:一、含水量 不同种类燃料的含水量区别很大,取决于燃料种类和储存方式。燃油热风炉为了保持生物质燃烧稳定性,在使用之前需要晾晒(有条件时要增设干料棚)。含水量增加会降低炉膛蓄热温度,增加燃料在燃烧室的不完全燃烧。含水量过大是国能生物质电厂带不上负荷的主要原因。含水多的燃料着火困难,影响燃烧速度,使炉内温度降低,使机械和化学不完全燃烧热损失增加,当燃料水分大于45%时,燃烧就非常困难。在燃烧过程中,水分因蒸发、汽化要消耗大量的汽化热。水分含量大的燃料其燃烧后的烟气体积较大(水变为蒸汽比体积增加了1200倍),由于出口烟气有130℃左右温度,因此随烟气带走的热量损失较多(此现象可以通过烟囱的排烟,观测到呈现大量乳白气体),燃油热风炉热风炉的热效率就较低。此外,烟气体积增加,引离心风机消耗的电能也随之增加,引风机功率增加了,使得烟气流速加快,燃烧上移,很难构建合理的燃烧工况,保障炉排燃烧动力平衡(养不住底火)。

Oil-fired hot blast stoves - professional manufacturer of biomass hot blast stoves, today provides variables that affect the combustion process of biomass hot blast stoves: 1. Water content of different types of fuels varies greatly, depending on the type of fuel and storage methods. In order to maintain the stability of biomass combustion, the oil-fired hot blast stove needs to be air-dried before use (dry material shed should be added when conditions permit). The increase of water content will reduce the heat storage temperature of the furnace and increase the incomplete combustion of fuel in the combustion chamber. Excessive water content is the main reason why the national biomass power plant is not loaded. It is difficult to ignite the fuel with high moisture content, which affects the combustion speed, reduces the temperature in the furnace and increases the heat loss of incomplete combustion. When the moisture content of the fuel is more than 45%, the combustion is very difficult. During the combustion process, evaporation and vaporization of water consume a large amount of vaporization heat. Fuel with high moisture content has a large volume of flue gas after combustion (the specific volume of water to steam increased by 1200 times). As the exit flue gas has a temperature of about 130 C, the heat loss with the flue gas is more (this phenomenon can be observed through the exhaust of the chimney, showing a large amount of milky white gas), the oil-fired hot blast stove hot blast stove The thermal efficiency is low. In addition, with the increase of flue gas volume, the power consumption of the induced centrifugal fan will be increased, the power of the induced draft fan will be increased, which makes the flue gas velocity quicken and the combustion move up. It is difficult to build a reasonable combustion condition to ensure the dynamic balance of the grate combustion (can not maintain the bottom fire). 烟气流速加快使得烟气携灰量也增加,加速了对炉膛尾部受热面的磨损。

The flue gas velocity increases, so that the ash carrying capacity of flue gas increases, which accelerates the abrasion of the heating surface of the furnace tail.

二、发热量

Two. Calorific value

(一)概念

(1) concept

(1)高位发热量(湿基)。燃油热风炉指1kg燃料在单位时间里完全燃烧所放出全部的热量,单位MJ/kg。

(1) high calorific value (Shi Ji). The fuel hot stove refers to the total combustion of 1kg fuel in unit time and the total heat released is MJ / kg per unit.

(2)低位发热量(干基)。燃油热风炉是燃烧热量中,去掉燃烧时生成的汽化潜热(水蒸气)所释放的热量,单位MJ/kg。

(2) low calorific value (dry basis). The oil-fired hot blast stove is the heat released by removing the latent heat of vaporization (water vapor) generated during combustion, per MJ / kg.



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