Low-grade fuel single prewarming and thermal storage type energy-saving boiler

Abstract

The invention discloses a single preheating and heat accumulating energy-saving boiler using low-calorie fuels, comprising a furnace body. Two or more burners are arranged on the furnace body; a high-temperature combustion-air inlet and a fuel inlet are arranged on each burner; the high-temperature combustion-air inlet is connected with a regenerator; the regenerator is connected with a constant-temperature combustion-air inlet and a low-temperature fume outlet; a switching-over unit is arranged between the constant-temperature combustion-air inlet and the low-temperature fume outlet. Firstly, the heat-energy loss is reduced and the combustion efficiency is improved by waste heat recovery at the regenerator; secondly, the constant-temperature combustion-air participates in the combustion-supporting after being preheated by the regenerator, and as a result, the combustion temperature is increased; thirdly, thirdly, a plurality of burners adopt periodical switching-over combustion, thereby, local high-temperature area inside the combustion chamber is avoided, the distribution of temperature in the combustion chamber is more even and the service life of the furnace chamber is prolonged. The single preheating and heat accumulating energy-saving boiler is applicable to various gas boilers.

Description

technical field [0001] The invention relates to a hot water or steam generating device, in particular to a boiler. Background technique [0002] Boilers are commonly used hot water or steam generating devices, but the existing boilers generally have low combustion efficiency and high combustion costs. [0003] Such as figure 1 Shown is a structural schematic diagram of a boiler in the prior art. The interior of the furnace body constitutes a combustion chamber, and a burner is installed on one side of the furnace body; aisle. Combustion-supporting air at room temperature is mixed with fuel and burned in the combustion chamber, and the hot flue gas after combustion is discharged out of the combustion chamber through the hot flue gas discharge channel. [0004] The above-mentioned prior art has at least the following disadvantages: first, when the calorific value of the fuel is the same, low-temperature air supports combustion, the temperature in the combustion chamber is r...

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Problems solved by technology

[0004] The above-mentioned prior art has at least the following disadvantages: firstly, when the calorific value of the fuel is the same, the temperature in the combustion chamber is low due to the low-temperature air combustion, and the temperature distribution in the combustion chamber is uneven, and there are local high-temperature areas, which affect the life of the furnace body; secondly, The exhaust gas temperature is high, taking away a lot of heat energy, and the combustion efficiency is low

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