Vacuum hot water boiler ultralow in nitrogen emission

Abstract

The invention discloses a vacuum hot water boiler ultralow in nitrogen emission. The vacuum hot water boiler ultralow in nitrogen emission comprises an ultralow nitrogen burner, a fuel gas distribution pipe, a hearth, a set of convective heat exchange pipes, a set of fin condensation pipes, primary heat medium water, and an internal and external spiral pipe set; the ultralow nitrogen burner communicates with the fuel gas distribution pipe; the set of convective heat exchange pipes are arranged in a combustion area of the vacuum hot water boiler hearth; the set of fin condensation pipes are arranged in the area behind the convective heat exchange pipes; the convective heat exchange pipes and the fin condensation pipes communicate with the primary heat medium water; and the internal and external spiral pipe set is located on the upper portion of the vacuum hot water boiler. According to the vacuum hot water boiler, a flame is divided into a plurality of small flame bodies through the fuel gas distribution pipe, as the small flame bodies are large in heat dissipation area and low in temperature, the amount of thermal reaction NO is decreased, in addition, the flame bodies are small in size, the stay time of oxygen, nitrogen and other gas in the flame bodies is shortened, and the thermal reaction NO and fuel NO are both obviously inhibited.

Description

[0001] 【Technical field】 [0002] The invention relates to a vacuum hot water boiler, in particular to a vacuum hot water boiler with ultra-low nitrogen emission, and belongs to the technical field of steam furnaces. [0003] 【Background technique】 [0004] The vacuum hot water boiler is a negative pressure phase-change hot water boiler. The furnace body of the vacuum hot water boiler is divided into upper and lower parts, and the lower part is a central back-fired shell steam boiler, which is composed of a flue and a furnace. The heating surface; the upper part is a vacuum chamber formed by vacuum pumping, and a tube-type steam-water heat exchanger is installed in the vacuum chamber to heat the circulating water flowing through the heat exchanger. The vacuum hot water boiler is a boiler that only outputs heat to the outside, but does not output the medium. The vacuum hot water boiler transfers heat between the heat transfer tube of the boiler and the heat exchanger through the...

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Problems solved by technology

Due to the inhalation of part of the flue gas in this structure, the combustion efficiency is low, and the price of the burner is relatively high. It also requires high structural requirements for the boiler furnace, which increases the manufacturing cost of the boiler.

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