问题 问答题 简答题

风管烧穿如何处理

答案

参考答案:

不管什么原因造成的风口烧穿事故,都应立即将风减到其它风口不灌渣的水平,并积极组织打水,视其具体情况再作减风处理。切不可盲目的一下把风量减到零。

1、烧穿部位发生在风管后部喇叭口与弯头法兰之间时,炉渣已进入风管内,在这种情况下减风不易过急,减到其它风口不灌渣的水平,外部用水强行冷却。必要时可稍回风顶,将渣子软回,待铁后休风处理。

2、烧穿部位发生在风管前部钢圈处时,应及时减风到0.05Mpa以下,尽量保持风口不灌渣,风管不掉下来,若这类事故发生在铁前。及时组织出铁,铁后休风。若发生在铁后短时间内,应立即休风。若铁后时间较长,抓紧组织出铁,铁后休风。

3、烧穿风管的位置若在泥炮、开口机、液压站等要害部位,应尽快减风,防止烧坏设备,避免事故扩大化,这是宁肯风口灌渣,也要迅速减风保护设备。如果风口灌渣不可避免,在休风后应迅速将视孔大盖打开,使渣子

流出。

4、当风管烧穿时,拉风应尽量避免其它风口灌渣,低压时间要稍长,先正常休风,待渣子沉下再改倒流休风。

5、高炉日常操作,要把炉况搞好,不要做低炉温,及时出净渣铁。

阅读理解

Domestic airline passengers will be able to make phone calls and send e-mails from the sky from next year, a local carrier has said.

Shenzhen Airlines said on Monday it has signed an agreement with Geneva-based On-Air to provide passengers with in-flight communications services on all its planes by the end of 2009. The service will be introduced on three aircraft ahead of the 2008 Olympics, on two routes----from Shenzhen to Beijing and Shenzhen to Shanghai, the airline said.

Passengers will be able to use their own electronic devices to send e-mails and short messages, make calls and surf the Internet, it said. The service is expected to be of particular interest to business travelers.

According to a survey at the end of last year, China had 4.55 million mobile-phone subscribers. Ninety-three percent of those polled said they wished they could send and receive e-mails and messages while on a plane.

Despite the introduction of the new service, passengers will still be prevented from using their cell phones and laptops when the plane is taking off and landing, or flying at less than 3,000 m above sea level, the official said.

The official said the new service would not lead to an increase in ticket prices, but users of Chinese mobile-phone services will be charged the international roaming rate for any calls made from the sky.

Shenzhen Airlines is the first Chinese carrier to provide such in-flight communications services. Its president, Li Kun, said installing the facilities will cost 4.5 million yuan ($596,000) per aircraft.  However, the project still needs to be approved by the Civil Aviation Administration of China, a source said.

1. According to the report, passengers can      on the plane by the end of 2009.

A. make phone calls    B. surf the Internet     

C. send short messages      D. all of the above

2. We can learn that the new service will be introduced           .

A. on two routes   B. in two cities    C. after the Beijing Olympics       D. on two aircrafts

3. Passengers will still be prevented from using their cell phones in the following situations except_______.

A. when the plane is taking off               B. when the plane is landing

C. when the plane is flying at less than 3,000 m in above sea level

D. when the plane is flying at 4,000 m above sea level

4. It can be inferred that the new service will probably cause           .

A. higher ticket prices   B. lower ticket prices  C. higher cell phone fee   D. lower cell phone fee

5. What’s the main idea of the passage?

A. Domestic airline needs to improve their service.

B. Domestic airline will make phone calls and e-mails available.

C. Chinese mobile-phone services will help domestic airline.

D. Chinese mobile-phone will charge more.

单项选择题