Negative-pressure injection type full-premix sectional combustion heating device

Abstract

The invention relates to a negative-pressure injection type full-premix sectional combustion heating device which comprises a shell, a fuel sectional supply system, a combustion chamber, a heat exchange system and an induced draft type smoke exhaust system. The fuel sectional supply system comprises gas pipes and a gas distribution cavity connected with the gas pipes, an electromagnetic valve A, an electromagnetic valve B, gas inlet cavities and gas nozzles are further arranged on the gas distribution cavity, annular gas inlets which are communicated with the shell are formed in the outer peripheries of gas nozzle groups in a surrounding manner, an injection type mixer is arranged at a position aligned with each gas nozzle, and a distribution orifice plate and a fire orifice plate are sequentially arranged on the top of each injection type mixer from bottom to top; the combustion chamber is arranged above the injection type mixers. The negative-pressure injection type full-premix sectional combustion heating device has the advantages that the negative-pressure injection type full-premix sectional combustion heating device is compact in structure, and is high in load regulating ratio range owing to a sectional combustion control technology, gas and air can be thoroughly mixed with each other when the heating device runs, a full-premix combustion mode is adopted, emission loads of carbon monoxide and nitrogen oxide in combustion products are low, and a low pollutant emission effect can be realized in gas combustion procedures.

Description

Technical field [0001] The invention relates to a system for heating and domestic hot water supply by using gas, in particular to a negative pressure jet type fully premixed segmented combustion system. Background technique [0002] The gas heating system is a device that uses the heat released by the combustion process of gas to heat the heating medium (water). Among them, the combustion mode of gas is divided into partial premixed combustion and full premixed combustion. Part of the premixed combustion process is relatively high in nitrogen oxides. With the increasing environmental protection requirements, some premixed combustion methods will gradually be eliminated. The fully premixed combustion method has the advantage of low pollutant emissions. At present, most fully premixed burners on the market are cylindrical, and the heat exchanger matched with it is a cylindrical heat exchanger. However, the problem that follows is that the cost of cylindrical heat exchangers is hi...

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Problems solved by technology

But the ensuing problem is that the cost of the cylindrical heat exchanger is higher than that of the finned heat exchanger, and the mixing system required by the cylindrical full premix burner is more complicated and costly, thus causing the entire gas The total investment and cost of the heating system is higher

The inventor once creatively invented a positive pressure injection type fully premixed combustion heating device (application number: 201310135997.7). Although this heating device can overcome the above shortcomings, the adjustment range of the heating load ratio is not large. In addition, the combustion chamber in the heating device is in a positive pressure state, and the combustion products may penetrate into the room, which will pollute the indoor environment.

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