问题 问答题 简答题

直流锅炉再热汽温度高的事故处理。

答案

参考答案:

处理:1.发现DCS故障导致再热汽温自动调节失控,应立即解除自动,手动调整再热汽温,DCS系统正常后再投入再热汽温调整自动。

2.出现RB动作、跳磨、掉焦、吹灰等燃烧工况发生大幅扰动时,汽温控制由DCS自动调整,值班员尽量不要手动干预,但应注意自动调节状况和汽温的变化。当发现自动调节工作不正常,汽温急剧变化时值班员应果断切为手动调整汽温。3.烟气挡板故障造成汽温异常时,将烟气挡板自动切换为手动调整,必要时投入事故减温水降低温度,严防再热蒸汽温度和管壁超温。

4.再热蒸汽系统受热面或管道泄漏应及时停炉处理,泄漏可能会造成蒸汽温度异常,在维持运行期间如再热蒸汽温度自动不能正常工作,应将其切为手动进行调整。

5.任何情况造成主汽再热蒸汽温度和受热面金属温度超温且短期调整无效时,应果断切除上排制粉系统降负荷,也允许切除全部制粉系统,保持锅炉燃油运行,确保受热面的安全。

单项选择题
单项选择题

在墨西哥度假

Each year more travelers are finding their way to the sun coasts of Mexico; where ancient civilizations once honored the sun, modern sun worshippers are discovering superb vacation destinations. Airlines now schedule weekly flights from major national and international points to a variety of sun coast resort areas.

The peninsula of Baja California provides one of the most splendid vacation sites in the Western Hemisphere. The peninsula is divided into two states: Baja California Norte and Baja California Sur, which are now connected by the Benito Ju rez Trans-peninsular Highway, so that the entire peninsula can be easily reached by car, as well as by sea and air. A chain of new hotels offer deluxe accommodations, but there are also numerous camping grounds, trailer parks and wayside inns for those who prefer casual-living vacations. At the southern end of the peninsula, La Pazi San Jos del Cabo and Cabo San Lucas offer rapidly expanding deluxe facilities to accommodate the growing influx of visitors. All have good accommodations, restaurants, sports facilities and meeting rooms. In addition, La Paz, with its duty-free zone, is a shopper’s paradise.

Kino Bay, a coastal resort on the mainland near Hermosillo, is expanding and will soon offer new luxurious tourist accommodations.

South along the coast are Topolobampo and Los Mochis, the former a ferry terminus serving La Paz on the peninsula, and boasting the largest natural bay in the world; and the latter a starting point for the Chihuahua-Pacific Railway trip which goes through the breath-taking Copper Canyon to the city of Chihuahua.

Mazatlan, the sailfish capital of the world, has developed a large new resort complex to accommodate its many visitors. Famous for its jumbo shrimp and other delicious seafood, Mazatlan also offers seasonal bullfights, lively evening entertainment and big-game fishing. An international fishing tournament is held there each fall. Modem convention and sports facilities are available. Mazatlan is easily reached from other major cities by good high-ways and an international aiport.

Puerto Vallarta, once a sleepy fishing village, is now one of Mexico’s fastest growing resorts. The red-tiled roofs and cobblestoned streets contrast with the luxurious new hotels. The annual temperature averages around 80°F., offering a perfect climate for parasailing, skin diving, surfing and other aquatic sports. Evening entertainment includes seafood dinners, floor shows and disco dancing that lasts until daybreak. Big-game hunting and fishing are also popular within this region of coastal Mexico.

The world’s largest natural bay is located in()

A.Topolobampo and Los Mochis

B.Los Mochis

C.Mazatlan

D.Topolobampo