Patent ID: 11859867
Assignee: XI'AN JIAOTONG UNIVERSITY
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 0:
1. A premixed low-nitrogen gas boiler, comprising a reversed flow-swirl mixer (1), a flow deflector (2), an upper flow equalizing plate (3), a lower flow equalizing plate (4), a comb-shaped water-cooled burner (5), a combustion chamber (6), hearth tube bundles (7), a ladder-shaped convergent hearth (8), and an exhaust port (10);
the reversed flow-swirl mixer (1) is capable of opposite mixing of natural gas and air, the flow deflector (2) is arranged at a gas mixture outlet of the reversed flow-swirl mixer (1), the upper flow equalizing plate (3) and the lower flow equalizing plate (4) are arranged below the flow deflector (2), the upper flow equalizing plate (3) is located above the lower flow equalizing plate (4), and a channel for enhancing mixing of gas mixture is formed between the upper flow equalizing plate (3) and the lower flow equalizing plate (4); the comb-shaped water-cooled burner (5) is arranged at a rear end of the lower flow equalizing plate (4), the combustion chamber (6) is arranged at a rear end of the comb-shaped water-cooled burner (5), the hearth tube bundles (7) are arranged in the ladder-shaped convergent hearth (8), and the hearth tube bundles (7) form an inner loop with a working medium water-steam mixture in a hearth water tank (9); and
wherein the reversed flow-swirl mixer (1) comprises inner side convergent air-swirl vanes (1b) arranged at an air inlet and outer side divergent air-swirl vanes (1a) which are arranged at the air inlet, and gas swirl vanes (1c) which are arranged at the gas mixture outlet and is provided with a swirl channel, the opposite mixing of swirls of the natural gas and the air is performed between an air-swirl outlet and a natural gas swirl outlet; and the inner side convergent air-swirl vanes (1b) are fixed to the reversed flow-swirl mixer (1) through wrapping and clamping of the outer side divergent air-swirl vanes (1a).