1

Boiler Type

A real CFB boiler

No enough furnace height, just a renovated boiling boiler

2

Furnace Height

Three-stage furnace with effective height of 2.5 to 2.8 times more than that of SHXF boiler

Post-combustion often occurs due to limited furnace height

3

Two-stage ash circulation.

Carbon content in ash is low. 

Able to handle low ash coal.

Single-stage ash circulation.

Carbon content in ash is high.

The combustion effect of low ash coal is not good.

4

Thermal Efficiency

88%-92%

78%-85%

5

Separator

Medium temperature separation.

Inlet temperature of separator is 500℃.

Separator has longer life and less heat loss.

No post-combustion exits and no coking occurs in separator.

High temperature separation.

Inlet temperature of separator is 850~900℃.

Separator has shorter life and more heatloss.

Post-combustion exits and coking easily occurs in separator.

6

Furnace Structure

Membrane structure, good sealing with small heat loss.

Some boilers adopt smooth tube structure.

Poor sealing with large air leakage and heavy furnace wall.

7

Construction

Cost

Single layer arrangement with lower construction cost.

Two layers are arranged, a 3.5-5m civil engineering support layer at the lower part.

Higher construction cost.

8

Fuel Adaptability

Good fuel adaptability to 1500～6000Kcal/kg fuels.

It can burn inferior fuel and high volatile fuel.

Can not burn high volatile fuel.

9

Abrasion

No convection tube bundle.

Convection tube bundle produces heavy abrasion.

1

产品规格

锅炉出力在6~160t/h；

35t/h以上较多，但35t/h以下锅炉非常罕见。

2

燃烧行程

三级炉膛，有效燃烧行程是立式循环流化床的1.6-1.8倍，燃烧时间长，燃尽率高。

单级炉膛，燃烧时间短。比较难于燃烧高挥发分的褐煤、生物质燃料等。

3

灰循环

两级回灰，飞灰含碳量低。能够处理低灰分煤炭。

一级回灰，飞灰含碳量高。对低灰分煤炭燃烧效果不好。

4

热效率

88-92%

86-90%

5

分离器

中温分离，分离器进口温度500℃，分离器寿命长，散热损失少。不存在后燃现象，分离器不结焦。

高温分离，分离器进口温度850~900℃，分离器寿命短，散热损失大。存在后燃现象，分离器易结焦。

6

土建成本

锅炉高度低，单层布置，土建成本低。

锅炉高度高，土建成本高。

7

燃料适应性

燃料适应性好，可燃劣质燃料、高挥发分燃料。

对高挥发分燃料、低灰分燃料适应性比较差。