Method for improving heat efficiency of gas boiler

Abstract

The invention discloses a technology for mixing inlet gases and condensing flue gas of a boiler. The technology is implemented by a combustion device of the boiler and a heat exchange device and includes a method for mixing the gases during combustion of the boiler. The technology is characterized in that a combustor is connected with a gas mixing chamber, the gas mixing chamber is provided with a gas connecting pipe and an air connecting pipe, and flow temperature changers, pressure temperature changers, pressure gauges and electric regulating valves are mounted on both the gas connecting pipe and the air connecting pipe. The technology has the advantages that the input quantity of air is controlled by means of flow interlocking, and an excess air coefficient is reduced, so that combustion is sufficient; stainless steel fin type heat exchange sections are adopted, the heat exchange area is increased, the problem of low-temperature corrosion of an existing boiler is solved, the temperature of the flue gas of the boiler can be effectively reduced, the temperature of exhausted smoke is reduced from 150 DEG C to 60 DEG C at least, and latent heat of vaporization of the flue gas is absorbed; and an automatic proportional regulation technology is adopted, the intensity of flame of the boiler is automatically adjusted according to a heat load, the optimal proportion of fuel to the air is kept constantly, energy consumption is reduced, and the heat efficiency of the boiler is improved.

Description

technical field [0001] The invention belongs to the field of boiler combustion, and in particular relates to a method for improving the thermal efficiency of a gas boiler. Background technique [0002] At present, the heating industry is mainly municipal heating. There are two heating modes for self-built boiler rooms. The operating efficiency of the boiler is about 70%. Generally, the fuel and air of the boiler enter the combustion chamber separately. The fuel cannot be fully mixed with the air, and the excess air coefficient cannot be reasonably controlled. It cannot be completely burned, and the exhaust gas temperature is about 200°C, and the heat loss of the exhaust gas is relatively large. per m 3 Natural gas can produce 1.55kg of water vapor after combustion, and the latent heat of gasification is about 3700kJ, accounting for about 10% of the high calorific value of natural gas. The exhaust gas temperature is high, the exhaust heat loss is large, resulting in poor bo...

AI Technical Summary

Problems solved by technology

The exhaust gas temperature is high, and the exhaust heat loss is large, resulting in poor boiler operation efficiency and large heat loss. How to solve the mixing of fuel and air and reduce the heat loss of exhaust smoke is a problem to be solved by us.

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