What are the differences between drum boilers and once-through boilers?
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The main differences between drum boilers and once-through boilers can be summarized in the following five aspects, as compiled from authoritative sources: 1. Core structure and working principle 1. Drum boiler: It features a drum as its key component, which stores large amounts of water and separates steam from water, thereby creating a natural circulation system. Workflow: Water → Heating → Separation of steam and water in the drum → Steam output; there is a fixed boiling point. Applicable only below the critical pressure (
The core structures and principles of drum boilers differ from those of once-through boilers. Water-tube boilers rely on a drum for steam separation, whereas once-through boilers do not have a drum and instead use the steam mixture in the pipes for circulation and separation. II. Design and operational efficiency: Drum boilers are relatively complex to design and require a large amount of space ； DC boilers have a simpler structure, occupy less space, and offer higher operational efficiency. III. Startup and speed regulation: DC boilers have a fast startup time, are easy to regulate, and possess strong capacity to adapt to changes in load ； The startup and adjustment speed of drum boilers is relatively slow. IV. Safety and Maintenance: Since DC boilers do not have a steam drum, their system is relatively simple, making maintenance and inspection easier, and they offer good safety features. Water-tube boilers require regular inspection of the water drum, and their maintenance is more complex. V. Application Scope: Drum boilers are suitable for applications that require a large volume of steady steam output, such as power plants ； DC boilers are suitable for industries that require rapid startup and frequent load changes, such as cogeneration. .