tailieunhanh - STEAM POWER by Mike Brown_4

Tham khảo tài liệu 'steam power by mike brown_4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Simpo PDF Merge and Split Unregistered Version - http MIL-HDBK-1003 7 Coal Scales. See MIL-HDBK-1003 6 regarding the use of rail car scales and the use of truck scales for coal delivery. Coal scales are also used to measure coal feed to stokers or pulverizers. These are located at the in-plant bunker outlet and may be of the batch weigh bucket volumetric volume rate of flow measurement belt or gravimetric weight rate of flow measurement belt type. Wood Firing. Combustion systems for wood are usually designed specifically for the material and mixture of fuels to be burned. When the moisture content is high over 60 to 65 percent supplemental firing of coal oil or gas can be used or the wood must be mixed with low-moisture fuels so that enough energy enters the boiler to support combustion. Dry wood may have a heating value of 8 750 Btu lb 20 353 kJ kg but at 80 percent moisture a pound of wet wood has a heating value of only 1 750 Btu lb 4071 kJ kg . The usual practice when burning wood is to propel the wood particles into the furnace through injectors along with preheated air with the purpose of inducing high turbulence in the boiler. The wood is injected high enough in the combustion chamber so that it is dried and all but the largest particles are burned before they reach the grate at the bottom of the furnace. Spreader stokers and cyclone burners work well for this application. For burning wood as a fuel to produce steam or high temperature water HTW methods should be researched thoroughly and their successful operation adequate source of fuel and economics evaluated. Suspension Burning. Small wood chips or saw dust are blown into the furnace chamber and burned in suspension. The ash or unburned particles are collected on traveling grate and transported to ash pit. In wood burning applications heat releases have been as high as 1 000 000 Btu ft2 hr. 11 357 373 kJ m2 hr of active grate area. Soot Blowers. Soot blowers are .