Full-premixing type condensation type steam generator

Abstract

The invention discloses a full-premixing type condensation type steam generator. Gas communicates with a gas inlet of a premixing cavity through a proportional valve. Air communicates with an air inlet of the premixing cavity through an air filter. The premixing cavity is connected with a draught fan inlet. A draught fan outlet is connected with a mixer. A mixer outlet is connected with a combustor. After being ignited, mixed gas enters an S-shaped heat exchange coil pipe arranged in a combustion barrel, and an outlet of the S-shaped heat exchange coil pipe in the combustion barrel communicates with a secondary heat exchanger through a smoke guide-out pipe. The top and the bottom of an auxiliary water tank communicate with water supplementing pipes at the top and the bottom of the combustion barrel correspondingly. Three water level sensors are arranged in the auxiliary water tank so as to induct the high water level, the middle water level and the low water level in the combustion barrel. A full-premixing combustion structure is adopted in the combustion barrel, meanwhile, the secondary heat exchanger is utilized for conducting condensation heat exchange on high-temperature smoke,gas and a certain amount of air are sufficiently mixed before combustion, the flame propagation velocity is high, the excess air coefficient is very small, heat efficiency is effectively improved, and emission of pollutants is reduced.

Description

technical field [0001] The invention relates to a burning appliance, in particular to a fully premixed condensing steam generator. Background technique [0002] Steam generator refers to a burning appliance that uses fuel to heat water into steam. Natural gas, liquefied petroleum gas and artificial gas are clean and environmentally friendly high-quality energy sources, which contain almost no sulfur, dust and other harmful substances, and produce less harmful substances during combustion. Compared with other fossil fuels, it can fundamentally improve the quality of the environment. However, the current gas-fired steam generators supply air through the fan during the combustion process. This atmospheric combustion method has slow flame propagation speed, low thermal efficiency, and more nitrogen oxide emissions, which is not conducive to environmental protection. Contents of the invention [0003] The invention provides a fully premixed condensing steam generator to solve ...

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Problems solved by technology

[0003] The present invention provides a fully premixed condensing steam generator to solve the problems of low combustion efficiency and non-environmental protection caused by air in the combustion process in the prior art

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