Low-nitrogen water tube boiler saving energy and bearing pressure

Abstract

The invention discloses an efficient low-nitrogen water tube boiler bearing pressure. The boiler comprises an upper boiler cylinder, a shell, a combustor distributing head, a film type water cooling wall tube bundle, a water cooling 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 boiler cylinder, an externally-arranged condenser, a pre-mixer, a matched fan, a water supply pump, a fuel gas valve set, a controller and the like. A closely-spaced tube, a metal hole plate, a ceramic hole plate and the like are adopted in the combustor distributing head, and are used for equalizing flow, preventing fire return and stabilizing flames, detachable design is adopted, and ash can be cleared in time. The water cooling flame tube bundle of the combustor distributing head is arranged in a plane or concave manner, and hearth space can be utilized to the maximum. The water cooling flame tube bundle on a boiler body is adopted for cooling flames, and the problem of heat distribution of a water cooling combustor is solved. According to the boiler, combustor and boiler integration of theplane / concave and convex curve combustor is achieved, the structure is compact, low-nitrogen and superlow-nitrogen combustion is achieved under the low excess air ratio, and technology monopoly of low-nitrogen combustor manufacturers at abroad in the field of steam boilers is broken through.

Description

technical field [0001] The invention relates to the technical field of gas-fired boilers, in particular to a pressurized gas-fired boiler using a plane / curved surface water-cooled full premix burner with a vertical water tube as the main heat exchange element. Background technique [0002] According to my country's energy plan, the proportion of natural gas in primary energy will increase to more than 15% by 2035, 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 increase rapidly. my country's industrial fuel gas accounts for about 30% of the total natural gas consumption. The boilers required in the industrial field are mostly low-pressure and 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...

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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