Two-stage anti-freezing air heater system

Abstract

The invention discloses a two-stage anti-freezing air heater system which comprises an air feeder, a first anti-freezing air heater, a first conventional air heater, an air pre-heater and a heat source system. An outlet of the air feeder communicates with an inlet of the air pre-heater through the heat absorption side of the first anti-freezing air heater and the heat absorption side of the first conventional air heater; an outlet of a primary air fan communicates with the inlet of the air pre-heater through the heat absorption side of a second anti-freezing air heater and the heat absorption side of a second conventional air heater; and the heat release side of the first anti-freezing air heater and the heat release side of the second anti-freezing air heater both communicate with the heat source system. The system can prevent the air heaters from frost cracking in extremely cold weather, so that the operation safety of the air heaters is improved.

Description

technical field [0001] The invention belongs to the field of energy saving and environmental protection, and relates to a two-stage antifreeze air heater system. Background technique [0002] In the northern regions of my country, especially Inner Mongolia and the extreme cold regions of Northeast China, the heaters of coal-fired units always operate under low-temperature environments, and the leakage and ash blockage of the heaters are serious, which affects the normal operation of the units. The main reasons are: (1) In extremely cold weather, due to the large temperature difference during the operation of the air heater, the thermal expansion between the rows of the air heater tubes is relatively large, which is difficult to absorb in the structure, resulting in leakage accidents; (2) the air heater The flow of the tube bundle is uneven, and the water in the drain tube of the air heater freezes, resulting in a vicious circle, which leads to the freezing and cracking of th...

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Problems solved by technology

[0002] In the northern regions of my country, especially Inner Mongolia and the extreme cold regions of Northeast China, the heaters of coal-fired units always operate in a low-temperature environment, and the leakage and ash blockage of the heaters are serious, which affects the normal operation of the units

The main reasons are: (1) In extremely cold weather, due to the large temperature difference during the operation of the air heater, the thermal expansion between the rows of the air heater tubes is relatively large, which is difficult to absorb in the structure, resulting in leakage accidents; (2) the air heater The flow of the tube bundle is uneven, and the water in the drain tube of the heater freezes, resulting in a vicious circle, resulting in cracking of the tube bundle of the heater

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