1. Water – tube boilers are widely used on up- to – date – cargo ships.
2. The additional heating surface provide more thermal energy from hot gases.
3. A system of headers and piping is provided to connect the boiler tubes and drums.
4. Air and fuel are mixed in the burner for combustion.
5. All the tubing surrounding the furnace absorb the radiated energy emitted by flame.
III. Выбрать правильное слово из списка и вставить его в предложение.
1. A part of the steam boiler that burns fuel is the furnace.
2. A device of the boiler that heats the feed water is the economizer.
3. A part of a steam power plant that converts water into steam is the boiler.
4. A device of the steam boiler that heats the steam is the superheater.
5. A device of a steam boiler that heats the steam is the air heater.
6. A device of a steam power plant that supplies the water to the boiler is the feed pump.
7. A part of the steam boiler that protects the furnace walls from high temperatures is the screen.
8. A device of the steam power plant that converts steam into water is the condenser.
IV. Перевести на русский.
For converting – для превращения , for transferring – для переноса , for releasing – для высвобождения , surrounding gases – окружающие газы , boiling surface - кипящая поверхность , circulating water - циркулирующая вода.
V. Выбрать подходящий предлог из списка.
1. The economizer receives feed water at one end. 2. Heated water is fed directly to the feed pump.
2. The gases pass through the boiler tube bank. 4. The tubes are fed with saturated steam.
5. Downcomers are located behind the first row of tubes. 6. The first row of tubes is backed by several more rows of tubing. 7. The furnace is enclosed from three sides. 8. The tubes are connected with piping. 9. Air and fuel are mixed for combustion. 10. The bubbles are released from the surface.
VI. Перевести.
1.In water tube boiler water circulates in tubes which are surrounded by gases from the outside.2. Fuel and air are mixed in the burner for effective combustion. 3. Chemical energy of fuel converts into steam heat energy in the boiler. 4. Circulating water and steam cool tubes and absorb fuel. 5. Burners are located on the front of the boiler . 6. Furnace roof, floor and walls of are screened in some up-to-date boilers. 7. Tubes surrounding the furnace form a convection heat transfer surface.8. Tubes located ( backed) behind the first row form a convection heat transfer surface. 9 . Superheater heats steam and economizer heats feed water. 10 . Air cooler heats the air which is then transferred to the furnace for combustion.
- 5 –
VII. Дать короткие ответы на вопросы.
1. The burner mixes fuel and air for combustion.