Finned tube type multi-return-stroke low-nitrogen condensation gas evaporator

Abstract

The invention discloses a finned tube type multi-return-stroke low-nitrogen condensation gas evaporator. The evaporator comprises a cavity limiting part, a combustion chamber and a plurality of flue gas chambers are limited in the cavity limiting part through partition plates, the flue gas chambers are separated by the partition plates, flue gas sequentially flows through the flue gas chambers inone direction, a multi-return-stroke finned tube type structure penetrating through the multiple flue gas chambers is arranged in the cavity limiting part, a combustion chamber is arranged at the starting end of the multi-return-stroke flue gas chamber, a combustor is installed in the combustion chamber, a flue gas exhaust pipe is installed in the flue gas chamber at the tail end of the multi-return-stroke flue gas chamber, and a flue gas exhaust condensate pipe is installed in the multi-return-stroke flue gas chamber. A premixing type combustion manner is adopted, equipment operation is morestable, and emission of nitric oxide can be effectively reduced; and the multi-return-stroke structure is adopted, the service life is greatly prolonged while the low cost is achieved, low-nitrogen condensation is achieved through the multi-return-stroke finned tube type structures of the flue gas chambers, the stability and safety problems of the evaporator are solved, and meanwhile the energy efficiency of the evaporator is greatly improved.

Description

technical field [0001] The invention relates to the technical field of gas steam generation, in particular to a finned tube type multi-return low-nitrogen condensing gas evaporator. Background technique [0002] The Chinese invention patent of CN201510403595.X discloses a gas steam generating device. It includes at least two steam units, each steam unit includes a combustion chamber, a fire row, and at least two heat exchangers, the fire row is located below the heat exchanger, and a heat exchanger in the same steam unit is provided with The other heat exchanger is provided with a steam outlet, and the heat exchangers in each steam unit are sequentially connected in series between the heat exchanger with a cold water inlet and the heat exchanger with a steam outlet. Therefore, the temperature difference between the heat exchangers in the same steam unit is large, and the two heat exchangers are also prone to heat exchange, which is beneficial to the low-temperature heat exc...

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Problems solved by technology

[0003] 1) The steam units are all independent units, and each independent unit must be equipped with a burner. If there are many burners, there will be more failure points, the equipment is bulky, and the production cost is high;

[0004] 2) The heat exchangers of each steam unit are installed independently. After installation, the heat exchangers of two adjacent steam units are completely connected by U-shape, which leads to inconvenience in the installation of heat exchangers. It will cause many problems and hidden dangers;

[0005] 3) The heat exchanger adopts a finned heat exchanger, which is placed horizontally without a water level gauge, which will easily cause the evaporator to dry and cause safety problems;

[0006] 4) The atmospheric fire row burner is used, the burner is at the bottom, the flame burns upwards, the atmospheric combustion is unstable, and the mixing ratio of air and gas cannot be accurately matched, and the flue gas flows upwards and the exhaust gas temperature cannot be achieved Low condensation combustion, if the exhaust gas temperature is low and condensed water appears, the condensed water will stay on the burner, which will cause a series of safety problems such as burner flameout and gas leakage;

[0007] 5) The heat exchange tubes of two adjacent steam units are connected by U-shaped elbows, and the upper and lower heat exchange straight tubes of the heat exchanger on the same steam unit are also connected by U-shaped tubes, which will cause internal Larger pressure resistance, resulting in low heat transfer efficiency

However, the heat exchange unit of the modular steam generating equipment also has the following disadvantages: a) each gas chamber is equipped with an atmospheric fire exhaust burner, and the atmospheric fire exhaust burner is used. The burner is at the bottom and the flame is upward Combustion, atmospheric combustion is unstable, and the mixing ratio of air and gas cannot be precisely proportioned. The upward flow of flue gas cannot achieve condensation combustion with low exhaust gas temperature. If the exhaust gas temperature is low and condensate water appears, the condensate water will Leaving it on the burner will cause a series of safety problems such as burner flameout and gas leakage; b) The heat exchanger is placed horizontally without a water level gauge, which will easily cause dry burning of the evaporator, causing safety problems and affecting the service life of the product; c ) The steam unit consists of multiple units, and each unit must be equipped with a burner. If there are more burners, there will be more failure points, the equipment is large in size, and the production cost is high;

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