Thread Content
The steam drum is the most important equipment in the boiler equipment. It is the connecting hub of the three processes of boiler heating, vaporization and superheating, and plays a connecting role. Water turns into qualified superheated steam in the boiler, which must go through three processes: heating, vaporization, and superheating. Heating the feed water into saturated water is a heating process ； The vaporization process of saturated water into saturated steam ； Heating saturated steam into superheated steam is a superheating process. The above three processes are completed by economizer, evaporation heating surface and superheater respectively. The steam drum is related to the above three processes. It needs to receive water from the economizer. ； Form a circulation loop with the evaporation heating surface ； The saturated steam is distributed from the steam drum to the superheater. The steam drum is not only the intersection point of the three processes of heating, vaporization and superheating, but also the dividing point of the three processes of heating, vaporization and superheating. Therefore, the steam drum is the connecting hub of the three processes of boiler heating, vaporization and superheating. Steam drum function? Since the steam drum is the connecting hub and dividing point of the three processes of boiler heating, vaporization and superheating ； What is its function? Energy storage and buffering: A certain amount of water and steam is stored in the steam drum, which has an energy storage effect. When the load changes, it has a certain buffering effect on the imbalance between evaporation and water supply and the rapid change of steam pressure. For example, when the load increases, the steam pressure will drop. At this time, the water that was originally in a saturated state can vaporize part of the steam by itself, causing the steam pressure to decrease slowly. Ensure steam quality: 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 steam quality and boiler quality. Ensure the safe operation of the boiler: The steam drum is equipped with a variety of water level gauges, pressure gauges, emergency drain valves, safety valves and other ancillary equipment to monitor the drum pressure and water level and protect the safe operation of the boiler. Introduction to the Steam Drum (1) The steam drum and the heat exchanger are connected by an ascending pipe and a descending pipe, forming the water circulation of the steam drum itself. The drum water cycle is a convective heat cycle. The hot water (steam) generated by the boiler enters the steam drum from the riser pipe. The hot water mass exchanges heat as it moves upward, and part of the water is converted into gaseous state. ； The cold water from the steam drum is replenished to the boiler through the downcomer under the action of gravity. The circulation of water between the drum and the boiler under the action of siphon is the self-circulation of the drum. The amount of steam rising is positively related to the amount of water falling. If the boiler water is pumped directly to the steam drum with the help of a pump to maintain the liquid level in the steam drum, this method is called forced circulation. At the same time, the steam drum receives water from the circulating water pump, and delivers saturated steam to the superheater, or directly outputs steam. Therefore, the steam drum is the connection hub for the three processes of working medium heating, evaporation, and superheating, ensuring the normal water circulation of the boiler. (2) There is a steam-water separation device and a continuous sewage discharge device inside the steam drum to ensure the boiler steam quality. (3) It has a certain amount of water and a certain heat storage capacity. When the boiler operating conditions change, it can slow down the change rate of steam pressure and stabilize the steam pressure. (4) The steam drum is equipped with pressure gauge, water level gauge, emergency water release, safety valve and other equipment to ensure the safe operation of the boiler. (5) The steam drum is a balanced container that provides the pressure required for the flow of the steam-water mixture on the water-cooled wall.