锅炉测试汇总

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The residence time of pulverized coal in the furnace is ( ).

The evenly distributed direct current pulverized coal burner is suitable for combustion. ( )

The graded air distribution direct current pulverized coal burner is not suitable for combustion. ( )

The characteristics of a graded air distribution direct current burner are ( ).

The speed of the low-speed pulverizer is ( ).

The speed of the medium speed pulverizer is (.

The most widely used coal mill ( ).

The medium speed pulverizer is compact in structure, small in floor area, light in weight, low in metal consumption and investment. （）

There is no problem with pulverized coal feeder of the positive pressure direct firing pulverizing system ( ).

Excessive fine particle size of pulverized coal can cause ( ).

The adjustment of pulverized coal fineness depends on ( ).

The pulverized coal takes the longest time in the ( ) stage of the combustion process.

Volatile matter is the main indicator for determining the ignition characteristics of fuels. The higher the volatile matter, the lower the ignition temperature of coal, the easier it is to ignite. （ A ）

(1) Which of the following diagrams is an equal air distribution burner ( )and which is a graded air distribution gas burner? ( ) (a or b)

(2) Which burner is suitable for burning lignite? () (a or b)

(3) That burner is suitable for burning coal with low volatile matter. ( ) (a or b)（含图）

1.The coal consumption of a boiler:B=100t/h.the heat loss is as follows:（含图）

The theoretical air quantity is

Excess air coefficient is.Please answer the following questions:

What is the boiler combustion efficiency equal to?

What is the boiler thermal efficiency equal to?

What is the hourly air supply of the boiler?

There are two units, A and B. The two units have the same model. The actual coal consumption of Unit A is 330g/kWh and Q net,ar=28000kJ/kg; The actual coal consumption of Unit B is 338g/kWh, Q net,ar=26000kJ/kg. Which unit is more economical?