问题 问答题 简答题

燃油中的灰分对锅炉有什么危害?

答案

参考答案:

1)灰分对油喷嘴产生磨损,影响雾化质量。

2)燃油中的灰分含有钒、纳等碱金属元素,会在水冷壁、过热器、再热器等高温受热面管上形成高温粘结灰。

3)燃油炉的高温积灰中,有较多的五氧化二钒及由钠形成含硫酸的复盐,它们都能破坏金属表面的氧化保护膜,从而在过热器和再热器上发生高温腐蚀。

4)燃油中的灰分在低温受热面上沉积,除使受热面低温腐蚀加剧外,还有可能堵塞空气预热器管,严重时会因通风阻力大、风量不足而影响锅炉出力。

阅读理解

Three Central Texas men were honored with the Texas Department of Public Safety's Director's Award in a Tuesday morning ceremony for their heroism in saving the victims of a serious two­car accident.

The accident occurred on March 25 when a vehicle lost control while traveling on rain­soaked State Highway 6 near Baylor Camp Road. It ran into an oncoming vehicle, leaving the occupants trapped inside as both vehicles burst into flames.

Bonge was the first on the scene and heard children screaming. He broke through a back window and pulled Mallory Smith, 10, and her sister, Megan Smith, 9, from the wreckage.

The girl's mother, Beckie Smith, was not with them at the time of the wreck, as they were traveling with their body sitter, Lisa Bowbin.

Beckie Smith still remembers the sickening feeling she had upon receiving the call informing her of the wreck and the despair as she drove to the scene.

Bozeman and Clemmons arrived shortly after Bonge and helped rescue the other victims and attempted to put out the fires.

“I was nervous,”Bozeman said. “I don't feel like I'm a hero. I was just doing what anyone should do in that situation. I hope someone would do the same for me.”

Everyone at the accident made it out alive, with the victims suffering from nonlife­threatening injuries. Mallory Smith broke both femurs, and Megan had neck and back injuries. Bowbin is still recovering from a broken pelvis, ankle and foot.

The rescuers also were taken to the hospital and treated for cuts and smoke breathing, Bonge said.

In addition, Bozeman got to meet accident victim Anthony Russo in the hospital after the accident, where Russo presented him with a glass frame inscribed with “Thank you”, Bozeman said. Those involved in that fateful encounter on Highway 6 credited God blessing for bringing them together.

“Whatever the circumstances, Tuesday's ceremony provided a time to be grateful for those who put their lives on the line for the lives of complete strangers,”Beckie Smith said,“We're calling it The Miracle on Highway 6.”

小题1:What's the main idea of the passage?

A.Three persons were awarded for rescuing victims in a car accident.

B.Three ordinary people were regarded as great heroes.

C.Several victims were carried to safety from the burning cars.

D.A car accident occurred on rain­soaked State Highway 6.小题2:Who saved Megan Smith from the damaged car?

A.Clemmons.

B.Anthony Russo.

C.Bozeman.

D.Bonge.小题3:Which of the following can be used to describe Bozeman?

A.Kind.

B.Modest.

C.Excited.

D.Smart.小题4:Which of the following is TRUE according to the passage?

A.Luckily, no one received too serious injuries in the accident.

B.All the victims received slight injuries in the accident.

C.The rescuers were taken to the hospital to visit the victims.

D.The injured will soon recover from their injuries.小题5:It can be inferred from what Beckie Smith said that____.

A.she regarded the accident as a wonder

B.she was frightened by the serious accident

C.she thought highly of the rescuers

D.she called on others to learn from the rescuers

判断题