The coal ignition temperature in CFB boiler

Summary:The coal ignition temperature in CFB boilers,the lowest bed temperature required for static coal combustion, is an important parameter for designing the start up burner and for choosing the automatic control parameters during the start up process.

04-05-2015

The coal ignition temperature in CFB boilers,the lowest bed temperature required for static coal combustion, is an important parameter for designing the start up burner and for choosing the automatic control parameters during the start up process.
 

The coal ignition temperature in CFB boiler

Traditionally, the coal ignition temperature in CFB boilers is estimated from experience with little theoretical basis and relatively large uncertainties in the estimates. These uncertainties result in operating difficulties and economic loses. For example, if the coal is fed into a furnace at a temperature lower than, the coal will not burn and the furnace temperature will decrease even more. Once the fuel concentration and temperature in the furnace reach the critical conditions, the mixture will flash and the furnace temperature will suddenly increase which leads to control problems. Feeding the coal in the furnace at temperatures higher than is safer but costs more start up time and fuel. Laboratory scale fluidized beds are often used to measure the coal ignition temperature in CFB boilers, based on the criteria such as the flame and spark characteristics, bed temperature response and oxygen response.The coal ignition temperaturein, in fluidized beds boilers is not only a function of the physical and chemical properties of the coal, but is also influenced by the heating rate, the boiler structure, the fluidization velocity and the particle size as well. Therefore, a set of standard operating conditions was specified for the measurements of the coal ignition temperature,in a laboratory scale fluidized bed boiler. This article described a standard for measuring the coal ignition temperature with typical results in a laboratory scale fluidized bed with under-bed preheat system. The tests measured for seven coal types were compared with the actual feed temperatures, in real CFB boilers in China at various loads. The temperature differences between measured in the laboratory fluidized bed and measured in the real CFB boilers for the various types of coal were plotted against the proximate analysis of the coal to estimate the lowest feed temperature in real CFB boilers.
 

Coal ignition temperatures in a laboratory scale fluidized bed with under-bed preheat system were measured at a standardized operation conditions. The ignition temperatures of seven coal types measured in the test rig were compared with the feed temperatures in real CFB boilers in China for various volatile content.
 

The results show that the ignition temperatures measured in the laboratory-fluidized bed accurately represent the real feed temperatures except for one anthracite coal type. Therefore, the feed temperatures in CFB boilers can be estimated from the ignition temperatures measured in laboratory scale test rig and the volatile content.

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Basic Information of CFB Boiler manufacturer--- ZG Boiler

Established:In 1945

Number of Employees:above 1500 People

Our products:industrial horizontal steam boiler and hot water boiler(biomass boiler, gas boiler, oil boiler, coal boiler, etc), CFB boiler, power plant boiler, waste heating recovery boiler, Pressure Vessel(AAC autoclave, Curing tank,etc )

Factory Size (Sq.meters):400,000 square meters

Factory Location:Factory 1: Zhengzhou,,Henan, China. Factory 2: Xingyang,Henan,China

Number of R&D Staff:376 people

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Export Percentage:30-40%

Total Annual Sales Volume:US$100 Million

Main Market:South America(Colombia, Venezuela, Guyana, Suriname, Ecuador, Peru, Brazil, Bolivia, Chile, Paraguay, Uruguay, Argentina and French Guiana),
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Biomass CFB Boiler Plant in Bahamas

In Bahamas, the biomass can be burned using conventional combustion technology like grate furnace or fluidized bed boilers. For power generation the biomass would be charged to the furnace of a steam boiler.Steam produces by the boiler will then drive a steam turbine generator to generate electricity. The typical capacity range for biomass power plants 1-20MW.

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Zhengzhou Boiler Co., Ltd (ZG Group), founded in 1945, is a joint-stock enterprise with A Grade Boiler design and manufacture license permits. Over 60 years' experience in Boiler design and manufacturing has rewarded us with an industrial boiler(circulating fluidized bed boiler, oil & gas fired boiler, chain grate boiler, waste heat boiler).

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