convection section การใช้

• The convection section is located above the radiant section where it is cooler to recover additional heat.
• A crossover is the tube that connects from the convection section outlet to the radiant section inlet.
• The area of the radiant section just before flue gas enters the shield section and into the convection section called the bridgezone.
• The crossover piping is normally located outside so that the temperature can be monitored and the efficiency of the convection section can be calculated.
• The stack draft ( pressure difference between air intake and air exit ) in the furnace, which is what pulls the flue gas through the convection section.
• The first two tube rows in the bottom of the convection section and at the top of the radiant section is an area of bare tubes ( without fins ) and are known as the shield section ( " shock tubes " ), so named because they are still exposed to plenty of radiation from the firebox and they also act to shield the convection section tubes, which are normally of less resistant material from the high temperatures in the firebox.
• The first two tube rows in the bottom of the convection section and at the top of the radiant section is an area of bare tubes ( without fins ) and are known as the shield section ( " shock tubes " ), so named because they are still exposed to plenty of radiation from the firebox and they also act to shield the convection section tubes, which are normally of less resistant material from the high temperatures in the firebox.