Gradient condensation type gas heat supply unit

Abstract

The invention relates to a gradient condensation type gas heat supply unit. The gradient condensation type gas heat supply unit comprises a body, an efficient heat exchange device, a tail smoke box, a base and a connection pipeline. The efficient heat exchange device comprises a shell, pipe bundles and a square inner barrel. In order to increase the heat transfer area of unit volume, helical fins are additionally arranged on the outer surfaces of the pipe bundles through strengthened heat transfer measures. In order to enable high-temperature smoke to make full contact with low-temperature fluid, according to the structure design of the square inner barrel, the pipe bundles are perpendicular to the high-temperature smoke in direction and arranged in a gradient array mode, and a direct flow channel for the low-temperature fluid is formed between the shell and the square inner barrel through the pipe bundles. The pipe bundles and the high-temperature smoke sprayed out from the body are arranged in an inverse cross flow mode, the residence time of the low-temperature fluid among the high-temperature smoke in the pipe bundles is increased, and thus the smoke discharge temperature can be lower than 70 DEG C. The gradient condensation type gas heat supply unit has the characteristics of being simple in structure, low in cost, safe in operation and capable of achieving energy conservation and environment protection. Through the efficient heat exchange device, gradient condensation heat exchange is achieved, sensible heat and vaporization latent heat in the discharge smoke are recycled effectively, and the thermal efficiency is improved.

Description

Technical field: [0001] The invention relates to a novel gas heating unit, specifically a gradient condensing gas heating unit, which belongs to the technical field of heating and heating in the construction industry. Background technique [0002] Generally speaking, the design principle of the condensing waste heat recovery boiler mainly lies in two aspects: (1) reduce the exhaust gas temperature, so that the flue gas can reach the dew point temperature, form condensed water, and release the latent heat of vaporization; (2) effectively absorb the flue gas waste heat, reducing sensible heat loss. When the flue gas cools to the dew point, the water vapor in the flue gas begins to condense and precipitate. The dew point of the flue gas mainly depends on the partial pressure of the water vapor in the flue gas. As the partial pressure of the water vapor increases, the dew point increases, and vice versa. When the temperature of the flue gas is lower than the dew point, the wat...

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Problems solved by technology

At present, the popular condensing waste heat recovery boilers on the market are all equipped with high-efficiency condensing heat exchangers and air preheaters in structure, which are used to absorb the sensible heat in the tail flue gas of the boiler and the latent heat released by the condensation of water vapor, which will inevitably cause Huge system and complex equipment structure, the project cost is also high

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