What are the classifications of boilers?




First, by purpose:

1. Power station boiler: used for power generation, mostly large-capacity, high-parameter boiler, fire chamber combustion, high efficiency, and the export working medium is superheated steam.
2. Industrial boilers: used for industrial production and heating, most of which are low-pressure, low-temperature, small-capacity boilers, which are mostly burned by fire beds, with low thermal efficiency. Exports, working fluids are called steam boilers, and the working medium is hot water. It is called a hot water boiler.
3. Marine boiler:
4. Locomotive boiler:
5. Steam injection boiler: used for oil injection of heavy oil in oil field, the export working medium is generally high pressure wet steam.

Second, by structure:

1. Fire tube boiler: The flue gas flows through the fire tube. It is generally a small-capacity, low-parameter boiler with low thermal efficiency, but the structure is simple, the water quality requirements are low, and the operation and maintenance are convenient.
2. Water tube boiler: The steam water flows through the tube and can be made into a small capacity, low-parameter boiler, or a large-capacity, high-parameter boiler. Power station boilers are generally water tube boilers with high thermal efficiency, but also have high requirements for water quality and operating level.

Third, classified by cycle

Natural circulation drum boiler
2. Multiple forced circulation boiler
3. Low rate circulating boiler
4. Once-through boiler
5. Compound circulation boiler

Fourth, according to the boiler outlet working pressure classification

1. Low pressure boiler: the general pressure is less than 1.275MPa
2. Medium pressure boiler: the general pressure is 3.825MPa
3. High pressure boiler: the general pressure is 9.8MPa
4. Ultra-high pressure boiler: the general pressure is 13.73MPa
5. Subcritical pressure boiler: general pressure is 16.67MPa 6. Supercritical pressure boiler: general pressure is 22.13MPa

Fifth, classified by combustion method

1. Fire bed combustion boiler: mainly used in industrial boilers, including fixed grate furnaces, reciprocating grate furnaces, etc.
2. Fire chamber burning boiler: mainly used in power station boilers, boilers burning liquid fuel, gaseous fuel and pulverized coal are fire chamber burning boilers
3. Boiling furnace: The air flow rate sent to the grate is high, so that large particles of coal are tumbling in the boiling bed above the grate, and small particles of coal are rising with the air and burning.

Sixth, classified by fuel or energy used

1. Solid fuel boiler: burning solid fuel such as coal;
2. Liquid fuel boiler: burning liquid fuel such as heavy oil;
3. Gas fuel boilers: burning gaseous fuels such as natural gas;

Seventh, classified by slag discharge method

1. Solid waste slag boiler
2. Liquid slag boiler

Eight, according to the furnace flue gas pressure

1. Negative pressure boiler: the furnace pressure maintains negative pressure, and there are sending and drafting fans, which are the main types of coal-fired boilers;
2. Micro-positive pressure boiler: the surface pressure of the furnace is 2-5KPa, no need for induced draft fan, easy to low-oxygen combustion;

Ninth, drum layout classification

1. Single drum
2. Double drum

Tenth, waste heat boiler: use waste heat from metallurgical, petrochemical and other industries as heat source;

Eleventh, atomic energy boiler: a steam generator that uses thermal energy released by a nuclear reactor as a heat source;

Twelfth, waste heat boiler: a boiler that uses waste such as garbage, bark, and waste liquid as fuel;

Thirteenth, other energy boilers: steam generators or water heaters that use geothermal, solar energy and other energy sources.

Class A boiler: rated working pressure (gauge pressure, the same below) P ≥ 3.8 MPa boiler, including:
1. Ultra-supercritical boiler: B≥27.0MPa or rated outlet temperature ≥590°C;
2. Supercritical boiler: 22.1MPa≤P<27.0MPa;
3. Subcritical boiler: 16.7MPa ≤ P < 22.1MPa;
4. Ultra-high pressure boiler: 13.7MPa≤P<16.7MPa;
5. High pressure boiler: 9.8MPa ≤ P < 13.7MPa;
6. Secondary high pressure boiler: 5.4MPa ≤ P < 9.8MPa;
7. Medium pressure boiler: 3.8MPa ≤ P < 5.4MPa.
Class B boiler:
1. Steam boiler: 0.8MPa<P<3.8MPa or rated evaporation >1.0t/h;
2. Hot water boiler: rated outlet water temperature ≥ 120 ° C or rated thermal power > 4.2 MW;
3. Organic heat carrier boiler:
(1) a boiler using a gas phase organic heat carrier;
(2) Liquid phase organic heat carrier boiler: rated thermal power > 4.2 MW;
Class C boiler: the following boilers except for the D-class boiler:
1. Steam boiler: a steam boiler with a rated working pressure ≤ 0.8 MPa and a rated evaporation ≤ 1.0 t/h;
2. Hot water boiler: rated outlet water temperature <120 ° C and rated thermal power ≤ 4.2 MW;
3. Liquid phase organic heat carrier boiler: rated thermal power ≤ 4.2MW.
Class D boiler:
1. Steam boiler: when designing the normal water level, the water volume is ≤ 50L and the rated working pressure is <0.8MPa;
2. Soda-water dual-purpose boiler: Boiler with rated working pressure ≤0.04MPa and rated evaporation ≤0.5t/h; E. Only hot water boiler pressurized with tap water, and the outlet water temperature is ≤95°C.

Fifteen, free name classification:

Coal-fired boilers, hot water boilers, oil-fired boilers, steam boilers, electric boilers, environmentally friendly boilers, special boilers, gas boilers, water tube boilers, heat transfer oil boilers, special boilers, dual fuel boiler, waste heat boilers, atmospheric boilers, electric boilers, Industrial boilers, hot air boilers, pressure boilers, vacuum boilers, chain boilers, domestic boilers, biogas boilers, heating boilers, tea bath boilers, power station boilers, straw gasifiers, incinerators, coal-water slurry boilers, gas generators, Organic heat carrier boiler, circulating fluidized bed boiler
Note: Our commonly mentioned boilers refer to industrial boilers, steam boilers, hot water boilers and organic heat carrier boilers.

Note: Our often mentioned boiler refers to an industrial boiler, steam boiler, hot water boiler, And organic heat carrier boilers.

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