What are the characteristics of the structure and operation of the drum boiler 5

The main functions of the steam drum are: the connection hub of the three processes of working fluid heating, evaporation and superheating to ensure the normal water circulation of the boiler; There is a steam-water separation device and a continuous sewage discharge device inside to ensure the quality of boiler steam; There is a certain amount of water, a certain heat storage capacity, and the change rate of steam pressure is slowed down; There are pressure gauges, water level gauges, accident water discharge, safety valves and other equipment on the steam drum to ensure the safe operation of the boiler.

The steam drum is the most important equipment in the boiler equipment, and it is the connecting hub of the three processes of boiler heating, vaporization and superheating, which plays the role of connecting the upper and lower levels. Water becomes qualified superheated steam in the boiler, which has to go through three processes: heating, vaporization, and superheating. Heating from feed water to saturated water is the heating process; The vaporization of saturated water into saturated steam is the process of vaporization; Heating saturated steam into superheated steam is the process of superheating.

The role of the boiler drum in a power plant is:

1. Connect the descending pipe, water cooling wall, connecting box, and exit pipe to form a closed water circulation loop.

2. A certain amount of water and steam is stored in the steam drum, which has the effect of energy storage, and when the load changes, it has a certain buffering effect on the imbalance between evaporation and water supply and the change rate of vapor pressure. If the load increases, the vapor pressure will decrease, and the water that was originally in a saturated state can vaporize a part of the vapor by itself, so that the vapor pressure decline rate tends to be slow. Of course, with the improvement of steam parameters, the boiler is easy to increase, and it is less and less obvious.

3. The steam drum is equipped with steam water separation device, steam cleaning device and other equipment, which can effectively carry out steam water separation, steam cleaning, dosing, sewage discharge, etc., to ensure the quality of steam and pot water.

4. The steam drum is the distribution center of boiler steam and water.

The steam drum is the hub for heating, evaporating and superheating! Ensure the normal water circulation of the boiler! In addition, there is a soda separator inside!

That's what it means upstairs! Plus a row! Steam quality can be guaranteed!

There is also a certain amount of water and a certain amount of heat storage capacity! It can slow down the change rate of vapor pressure!

Finally, there is another function, which is that pressure gauges, water level gauges, safety valves, etc. can be installed on it! It can ensure the safe operation of the boiler!

The steam drum (also known as the boiler) is the most important pressurized element in a natural circulation boiler.

The main functions of the steam drum are:

1: It is the connection hub of the three processes of working fluid heating, evaporation and superheating to ensure the normal water circulation of the boiler.

2: There is a steam-water separation device and a continuous sewage discharge device inside to ensure the quality of boiler steam.

3: There is a certain amount of water, with a certain heat storage capacity, to slow down the change rate of vapor pressure.

4: There is a pressure gauge on the steam drum.

Water level gauge, accident drain, safety valve.

and other equipment to ensure the safe operation of the boiler.

Steam drums. Located at the top of the boiler, it is a cylindrical pressure vessel, the lower part is water, the upper part is steam, it accepts the water from the economizer, and at the same time forms a water circulation circuit with the descending pipe, the coupling box and the water cooling wall. The steam-water mixture formed by water absorption in the water wall is collected in the steam drum, and the saturated steam is transported to the superheater after the steam-water separation.

For exhaust, there is hot air inside the boiler, and the pressure reaches a certain level to open the steam drum to discharge the gas.

The biggest difference between a steam drum boiler and a through-flow boiler is whether there is a steam drum or not, and because of the relationship between whether there is a steam drum or not, another difference between them is whether there is a circulating water pump. The steam drum boiler is a low-pressure boiler, which relies on the rising force generated by the difference in steam density to make the water and steam descending from the steam drum return to the steam drum for separation, and the qualified steam enters the superheater for heating and temperature control; The first-flow boiler is mostly used under the condition that the pressure is greater than that, and the steam density difference is almost zero at such a high pressure, and the rising force of the steam density difference is zero, so it is necessary to connect the working fluid in the descending pipe to the superheater in series circulating water pump to add the working fluid directly to the superheater, and complete the preheating, vaporization and superheating at one time, so this kind of boiler is also called forced circulation boiler.

Do! I'm a boiler burner!

The main advantages of the drum boiler: (1) Because there is a large amount of water stored in the steam drum, it has a large heat storage capacity, which can buffer the steam pressure change caused by load change; (2) Due to the fixed demarcation line between water, steam and superheated steam, the superheated steam temperature change is small when the load changes; (3) Because there is a steam cleaning device in the steam drum, the quality of the feed water is low.

The main disadvantages of the drum furnace are: (1) large metal consumption; (2) lag in response to accommodation; (3) It can only be used for working pressure below the critical pressure.

The main advantages of the through-flow boiler are: (1) small metal consumption; (2) Short start-stop time and sensitive adjustment; (3) It is not limited by pressure, and can be used for both subcritical pressure boiler and supercritical pressure boiler.

The main disadvantages of the through-flow boiler: (1) high requirements for feed water quality; (2) The power consumption of the feed pump is large; (3) High requirements for automatic control system; (4) Must be equipped with a dedicated start-up bypass.

The steam boiler drum is one of the main components of the boiler, and the functions of the steam boiler drum are mainly as follows:

1) The steam drum of the steam boiler is connected with the descending pipe and the water wall to form a natural circulation loop. At the same time, the steam boiler steam drum receives feed water from the economizer and also delivers saturated steam to the superheater. Therefore, the steam drum of the steam boiler is the connecting hub of the three processes of heating, evaporation and superheating in the boiler.

2) There is a certain amount of water stored in the steam drum of the steam boiler, so it has a certain energy storage capacity. When the working conditions of the steam boiler change, the speed of steam pressure change can be slowed down, which is beneficial to the operation regulation, so as to improve the safety of boiler operation.

3) The steam boiler drum is equipped with various equipment to ensure the quality of steam. For example, the steam-water separation device in the steam boiler drum can separate the salty water droplets in the steam; The cleaning device in the steam drum of the steam boiler can remove the dissolved salts in the steam; The continuous blowdown device in the steam drum of the steam boiler can reduce the salt content of the boiler water; The dosing device of the steam drum of the steam boiler can be used to treat the water in the boiler, so as to improve the quality of the steam.

The steam drum is the hub for heating, evaporating and superheating! Ensure the normal water circulation of the boiler! In addition, there is a soda separator inside!

That's what it means upstairs! Plus a row! Steam quality can be guaranteed!

There is also a certain amount of water and a certain amount of heat storage capacity! It can slow down the change rate of vapor pressure!

Finally, there is another function, which is that pressure gauges, water level gauges, safety valves, etc. can be installed on it! It can ensure the safe operation of the boiler!

The main difference between the control circulation drum boiler and the natural circulation drum boiler in terms of working principle is that the boiler is divided into natural circulation boilers, direct flow boilers and forced circulation boilers according to the different power of water or water vapor circulation. The water or water vapor in the heating pipe in the natural circulation boiler is circulated in the pipe stove by relying on the density difference between the water and water vapor in the pipeline, without other power, so it is called a natural circulation boiler.

Forced circulation is to achieve circulation with the help of external force, generally because the density and specific gravity of the medium raw material does not change much after heating, or its own power flow can not achieve circulation. The natural circulation is to complete the circulation of the medium with the help of the specific gravity difference caused by the temperature difference of the medium itself, and the specific gravity density is generally greatly affected. In addition, due to the increase in temperature, it is easy to form some unnecessary factors, such as gluing, it is necessary to use forced circulation.

The boiler drum is an indispensable equipment in the operation of the boiler, and its role is reflected in the following three aspects.

First, the boiler drum can be used to regulate the boiler water level. When the boiler water level is too low, the steam will enter the boiler water level gauge and push the pointer to the normal water level position to replenish the water.

Second, the boiler steam drum can be used to reduce the amplitude of the boiler water surface fluctuation. Because the change of water level in the boiler water tank will cause the constant swing of the boiler leveler panel, which will affect the normal operation of the boiler, and the boiler steam drum can absorb the impact of part of the liquid level change, reduce the impact of the boiler and make the boiler run more smoothly.

Thirdly, the boiler drum can also ensure the effect of steam-water separation. When the boiler is running, a large number of bubbles will be formed in the open air water, and the steam will rush up because it is thinner than water, and the existence of the boiler steam drum makes the bubbles can be filtered out in the steam drum to ensure the clean separation of water and steam, thereby increasing the safety and efficiency of the boiler.

In short, the boiler steam drum plays a very important role in the boiler system, ensuring the normal operation of the boiler, and is also an important guarantee for the safe operation of the boiler.

What are the main equipment (devices) configured in the steam boiler drum?

1. Framework: support and fix boiler components. 2. Furnace:

Ensure that the boiler fuel is burned out and the outlet flue gas temperature is cooled to a value where the convection heating surface can work safely. 3. Water wall: the main radiant heating surface of the boiler, absorbing the radiant heat of the furnace, heating the working fluid, protecting the furnace wall, etc.

4. Combustion equipment: send the fuel and the air required for combustion into the furnace and make the fuel fire stable and burn well: 5. Air preheater:

Heating the air used for fuel, and the first auspicious boy strengthens the ignition and combustion; Absorb the waste heat of flue gas, reduce the exhaust gas temperature, and improve the efficiency of the boiler. 6. Furnace wall: It is the protective shell of the boiler, which plays the role of sealing and heat preservation.

7. Pot: Tie the heating surface of the boiler together and form a water circulation circuit with the water wall and descending pipe.