What are the requirements when designing a superheater?
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As the title suggests, what are the requirements when designing a superheater? 1. It has good temperature characteristics, with the steam temperature remaining normal or only slightly changing when the load varies. 2. It responds quickly to temperature changes and is easy to adjust. 3. Save steel, especially alloy steel. 4. Lower flow resistance. It is 0.5 MPa at medium pressure, and around 1 MPa at high pressure. 5. It operates safely and reliably, and is easy to manufacture and maintain
Chemical processing equipment has many requirements; your question is a bit too broad. If you have specific questions, please ask them on the chemical engineering forum at http://bbs.hg707.com
This post was last edited by zgj2405 on 2011-7-6 at 17:30. 1. Heat exchange area (in terms of load): It can adapt well to changes in the device’s load; generally, the load adjustment range for the device is 30%~110%； 2. Keeping the pressure drop as low as possible can help reduce production costs ； 3. Ensure the safe and reliable operation of the equipment, as well as ease of manufacturing and maintenance.
This post was last edited by zgj2405 on 2011-7-6 at 17:30. For power plant boilers: 1. Determine the unit capacity: 300–1000 MW. 2. Decide on the boiler type: π-type, tower-type, W-type, etc. 3. Choose the combustion method: four-corner combustion, counterflow combustion, etc. 4. Identify the coal type suitable for boiler design: bituminous coal, lignite, sub-bituminous coal, anthracite, etc. 5. Set the outlet temperature of the boiler furnace: 900–1100°C. 6. Volume heat load varies depending on the coal type. Based on these calculations, the arrangement of the heating surfaces differs for subcritical, supercritical, and ultra-supercritical boilers; the layout areas for low-temperature superheaters, screen superheaters, and wall superheaters also vary.
1. The material meets the requirements. 2. Stress design: The stress in critical areas must be properly considered.
1. Heat exchange area 2. Keep the pressure drop as low as possible to save production and operation costs； 3. Layout method (downstream or upstream), 4. Temperature control method and control range, 3. Selection of material.
1. The steel materials selected can all meet the temperature requirements for the metal tubes of each stage of the superheaters during normal operation. 2. To determine the strength of the superheater and select appropriate steel materials, it is necessary to calculate the wall temperature of the tubes during the design of the superheater. When performing strength calculations, it is necessary to calculate the average temperature tb on the pipe wall thickness; when determining whether oxide scale will form, it is required to calculate the outer surface temperature twb of the pipe wall. 3. For the thermocouples used to measure the wall temperatures of the boiler superheater and reheater tubes, their measuring ends should be installed on a vertical tube section within 100 millimeters above the top tubes. When the boiler structure does not permit it, it can be raised appropriately, but the elevations of all measurement points installed on the same superheater or reheater should be consistent. 4. The temperature is easy to adjust, with a rapid response. 5. Low smoke flow resistance. 6. Strong ability to adapt to different coal types. 7. It has a wide load regulation range, strong regulation capability, and excellent stable combustion at low loads. 8. It has good safety features and is easy to install and debug.