Efficient flue gas circulation system and gas water heater thereof

Abstract

The invention discloses an efficient flue gas circulation system. The efficient flue gas circulation system comprises a main controller and a circulating gas inlet pipeline connected between heat exchanger flue gas and a combustor. The efficient flue gas circulation system is characterized in that the circulating gas inlet pipeline is a second-level heat exchanger connected to the gas water heater; and an electric control valve is arranged on the circulating gas inlet pipeline, and the main controller is connected with the electric control valve in an electric control manner. The invention further discloses a gas water heater of the efficient flue gas circulating system. By the adoption of the efficient flue gas circulating system and the gas water heater, the temperature of the combustor can be lowered, the gas detonation is prevented, the safety and reliability are achieved, the generation of nitrogen oxide can be inhibited effectively, the water heating efficiency is improved, and the emission of the nitrogen oxide is lowered as well.

Description

Technical field [0001] The invention relates to the technical field of combustion heating devices, in particular to the technical field of flue gas circulation systems such as gas water heaters. Background technique [0002] The current condensing gas water heater uses high-temperature flue gas for secondary heat exchange of cold water. After the high-temperature flue gas heats up, it is directly discharged into the air through the exhaust port of the condensing heat exchanger. The main harmful gas in the flue gas is NOx, which causes damage to the air. Pollution. [0003] There are also exhaust gas recycling, such as the patent titled gas water heater exhaust gas recycling device (CN201020134062.9), publication (announcement) number CN201662234U, application date: 2010.03.15, publication (announcement) date of 2010.12.01 invention The patent relates to a gas water heater tail gas recycling device, which belongs to the technical field of gas water heaters. It includes a combustion...

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Problems solved by technology

[0002] Existing condensing gas water heaters use high-temperature flue gas to perform secondary heat exchange on cold water. Pollution

[0003] There are also those that adopt tail gas recycling, such as the invention whose patent name is gas water heater tail gas recycling device (CN201020134062.9), publication (announcement) number is CN201662234U, application date is: 2010.03.15, and publication (announcement) date is 2010.12.01 The patent relates to a gas water heater tail gas recycling device, which belongs to the technical field of gas water heaters. Combustion, the combustion chamber is also provided with a secondary tail gas outlet. The invention connects the tail gas to the combustion chamber for secondary combustion, effectively reducing the content of carbon monoxide, nitrogen monoxide and unburned combustible gases in the tail gas, and preventing poisoning events. Occurs, but because the flue gas temperature is too low on the one hand, and the addition amount is uncontrollable on the other hand, it will affect the combustion performance and cannot achieve the best effect

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