Full-premixing water-cooling gas boiler with U-shaped pipe structure

Abstract

The invention discloses a full-premixing water-cooling gas boiler with a U-shaped pipe structure. The full-premixing water-cooling gas boiler comprises a water-cooling combustor and a water-cooling heat exchanger which are coaxially arranged, a premixer and a water-cooling combustion head are arranged in the water-cooling combustor, a water outlet of the water-cooling combustor is in communicationwith a water inlet of the water-cooling heat exchanger, and the premixer is in communication with a gas inlet of the water-cooling combustion head; the water-cooling combustion head comprises combustion head water-cooling tube bundles and a combustion head upper header, the combustion head upper header is nested inside and outside, and the two ends of each combustion head water-cooling tube bundle are in communication with the combustion head upper header on the inner side and the combustion head upper header on the outer side respectively; a water inlet of the combustion head upper header isin communication with boiler feed water, and a single water cooling tube of each water cooling tube bundle is U-shaped; a flow equalizing pore plate is arranged on the inner side of the water-coolingcombustion head, and an ignition gun is arranged on the outer side of the water-cooling combustion head; and flue gas flows out of the water-cooling combustion head, then uniformly flows to each water-cooling tube bundle in the water-cooling heat exchanger, then flows downwards to a dew containing disc from a gap between an outer-ring water-cooling tube bundle and the boiler wall and is discharged through a chimney, so that the heat exchange capacity is greatly improved, and the safe and stable operation of the boiler is facilitated.

Description

technical field [0001] The invention belongs to the field of safe and stable low-nitrogen combustion of natural gas, burners and boiler design, and in particular relates to a fully premixed water-cooled gas boiler with a U-shaped tube structure. Background technique [0002] Burners are divided into diffusion burners, partial premix burners and full premix burners according to whether they are mixed before combustion and the degree of mixing. Diffusion burners are simple in structure, safe and reliable in operation, and have no flashback risk, but they have longer flames and larger combustion space; some premixed burners are mainly used in traditional small wall-mounted gas boilers, and the structure is bulky when the heat load is large; The fully premixed gas combustion method has high combustion intensity, short flame, small volume of combustion equipment, uniform combustion, and no local high temperature zone. It has significant advantages in large gas boilers, but it may...

AI Technical Summary

Problems solved by technology

Water-cooled burners have developed rapidly in recent years, but they are mostly used in small wall-hung boilers. Because of their poor adaptability to boilers, the transformation workload is large

[0003] The traditional boiler adopts the upper and lower square header structure, which is welded by 4 steel plates or the upper and lower half heads and the short cylinder. Both the straight tube bundle and the upper and lower headers need to be welded. Both ends of the straight tube need to be necked, which increases the process cost. , too many solder joints; in traditional boilers, the flue gas after burner combustion flows to one side of the water-cooled heat exchanger tube bundle, and then flows out around the gap between the outer ring tube bundle and the furnace wall, and the temperature distribution of the water-cooled tube bundle at different positions is extremely uneven , easily lead to accidents such as pipe bursts

Images