Low-calorie fuel dual prewarming and thermal storage type energy-saving boiler

Abstract

The invention discloses a double preheating and heat-accumulating energy-saving boiler using low-calorie fuels, comprising a furnace body. Two or a plurality of burners are arranged in the furnace body; each burner is provided with a high-temperature combustion-air inlet and a high-temperature fuel inlet; the high-temperature combustion-air inlet and the high-temperature fuel inlet are connected with an air heat-accumulating chamber and a fuel heat-accumulating chamber respectively; and a plurality of burners are adopted for combustion and smoke venting in turn. Firstly, the recovery of waste heat is conducted through the air / fuel heat-accumulating chamber during exhausting smoke, as a result, the loss of heat-energy is reduced and the combustion efficiency is improved; secondly constant-temperature combustion-air and low-temperature fuels are preheated and mixed by the air heat-accumulating chamber and the fuel heat-accumulating chamber for combustion, and as a result, the combustion temperature is increased; thirdly, a plurality of burners adopt periodical reversing combustion, and as a result, the local high-temperature area in the combustion chamber is eliminated, the temperature in the combustion chamber is distributed more evenly, and the service life of the furnace is prolonged.

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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