Cylindrical low-nitrogen energy-saving pressure-bearing water pipe boiler

Abstract

The invention discloses a cylindrical low-nitrogen energy-saving pressure-bearing water pipe boiler which comprises an upper seal head, a shell, a burner distribution head, a water-cooled wall tube bundle, a water-cooled flame tube bundle, a radiation tube bundle, a high-temperature convection tube bundle, a low-temperature convection tube bundle, a descending tube bundle, a lower seal head, an external condenser, a pre-mixer and a matched fan, a water supply pump, a gas valve group, a controller and the like. A burner achieves side face gas feeding, and densely-arranged pipes, a metal pore plate, a ceramic pore plate and the like are adopted for preventing fire return and stabilizing flame. The burner is detachable, thereby facilitating maintenance and repair. The water-cooled flame tubebundle of the burner distribution head is arranged in a plane or convex shape, so that the space of a hearth is utilized to be maximum; and the water-cooled flame tube bundle on a boiler body is adopted to cool the flame, so that the heat distribution problem of the water-cooled burner is solved. Machine-boiler integration of plane and curved surface burners is achieved, the structure is compact,low-nitrogen and ultra-low-nitrogen combustion are achieved at lower excess air coefficients, and the technical monopoly of foreign low-nitrogen burner manufacturers in the field of steam boilers is broken through.

Description

technical field [0001] The invention relates to the technical field of gas boilers, in particular to a cylindrical low-nitrogen energy-saving pressure-bearing water tube boiler. Background technique [0002] According to my country's energy planning, by 2035 the proportion of natural gas in primary energy will increase to more than 15%, and the annual consumption will reach more than 640 billion cubic meters. In 2019, my country's natural gas consumption was 306.7 billion cubic meters. In the next 15 years, the annual consumption of natural gas will grow rapidly. my country's industrial fuel gas accounts for about 30% of the total natural gas consumption. Most of the boilers required in the industrial field are low-pressure small-capacity boilers with a pressure lower than 2.45MPa, including low-pressure hot water boilers and low-pressure steam boilers. At present, coal-fired boilers below 35 steam tons have been basically eliminated, and the market segment of low-pressure ...

AI Technical Summary

Problems solved by technology

The interior adopts multiple rows of staggered light tubes. Once the flue gas side is fouled, it is difficult to clean. The water-cooled tube bundle used to cool the flame is easy to be blocked by carbon deposits and needs to be cleaned regularly. The maintenance of the furnace body is inconvenient.

[0005] At present, there is a lack of pressure-bearing gas boilers suitable for flat / curved surface burners that are easy to maintain in the market, so a new type of vertical water tube boiler is developed for this purpose

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