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It can be divided into vertical gas hot water boiler and horizontal gas hot water boiler according to structure; it can be divided into gas heating hot water boiler and gas bath hot water boiler according to use; it can be divided into atmospheric gas hot water boiler and pressure-bearing according to structure. Gas hot water boiler; according to the fuel, it can be divided into natural gas hot water boiler, city gas hot water boiler, biogas hot water boiler, liquefied gas hot water boiler and so on.
The structure of a horizontal gas-fired hot water boiler usually adopts a pan shell type three-return, full wet back structure. All the pressure components are symmetrical to the center of the drum. The boiler adopts a full wet back structure. With a large inner cylinder and eccentric fire box structure, it is conducive to expanding enough radiant heating surface. The convection heating surface consists of the second and third return tube bundles. The front tube sheet of the flashback chamber is connected to the furnace tube, and the rear tube sheet of the flashback chamber uses an oval head and tube sheet. The turning smoke chambers on the second and third rounds constitute the front smoke box, and the temperature of the smoke from this smoke has fallen below 500 ° C. Therefore, the structure of the front smoke box adopts a lightweight structure of refractory and heat insulation materials. The flue gas outlet of the rear smoke box is arranged in the direction along the longitudinal axis of the cylinder, which not only shortens the length of the furnace body, but also prevents the chimney from being placed in a direction perpendicular to the longitudinal axis of the cylinder, and the condensed water corrodes the boiler body when the boiler starts and stops. The design of this boiler mainly considers the principles of boiler maintenance and stability. The water mixing device is installed in the boiler return water inlet. The return water first flushes the flue tube bundle and then contacts the furnace tube, which increases the water temperature of the return water contacting the furnace tube. Avoid the phenomenon of partial cold boiling.
The structure of a horizontal gas-fired hot water boiler usually adopts a pan shell type three-return, full wet back structure. All the pressure components are symmetrical to the center of the drum. The boiler adopts a full wet back structure. With a large inner cylinder and eccentric fire box structure, it is conducive to expanding enough radiant heating surface. The convection heating surface consists of the second and third return tube bundles. The front tube sheet of the flashback chamber is connected to the furnace tube, and the rear tube sheet of the flashback chamber uses an oval head and tube sheet. The turning smoke chambers on the second and third rounds constitute the front smoke box, and the temperature of the smoke from this smoke has fallen below 500 ° C. Therefore, the structure of the front smoke box adopts a lightweight structure of refractory and heat insulation materials. The flue gas outlet of the rear smoke box is arranged in the direction along the longitudinal axis of the cylinder, which not only shortens the length of the furnace body, but also prevents the chimney from being placed in a direction perpendicular to the longitudinal axis of the cylinder, and the condensed water corrodes the boiler body when the boiler starts and stops. The design of this boiler mainly considers the principles of boiler maintenance and stability. The water mixing device is installed in the boiler return water inlet. The return water first flushes the flue tube bundle and then contacts the furnace tube, which increases the water temperature of the return water contacting the furnace tube. Avoid the phenomenon of partial cold boiling.