Antifreezing heat pipe air heater system

Abstract

The invention discloses an antifreezing heat pipe air heater system which comprises a heat pipe air heater body, an air heater water chamber with a first water opening and a second water opening, a downstream heat exchange control circuit and a counterflow heat exchange control circuit. The lower portions of all heat pipes stretch into the air heater water chamber, and when the temperature of air is lower than or equal to set temperature, hot water supplied to the air heater water chamber from the outside flows to the second water opening from the first water opening to be consistent with the flowing direction of the air passing through the heat pipe air heater body; the counterflow heat exchange control circuit is connected with the second water opening and the first water opening, and when the temperature of the air is higher than the set temperature, the hot water supplied to the air heater water chamber from the outside flows to the first water opening from the second water opening to be opposite to the flowing direction of the air passing through the heat pipe air heater body. The antifreezing heat pipe air heater system has the advantages that when the antifreezing heat pipe air heater system is in downstream heat exchange with the air, the heat pipes are prevented from being frozen well, and freezing prevention in winter is thoroughly achieved; when the antifreezing heat pipe air heater system is in counterflow heat exchange with the air, the heat exchange effect is well enhanced.

Description

technical field [0001] The invention relates to a warm air system, in particular to an antifreeze type heat pipe heater system. Background technique [0002] In northern my country, a heater is generally installed at the inlet of the air preheater to increase the wall temperature of the cold end of the air preheater and prevent low-temperature corrosion and ash blocking at the cold end of the air preheater. At present, most air heaters use auxiliary steam as a heat source to heat low-temperature air; however, the auxiliary steam is of high grade and is used to heat the air heater, resulting in serious energy consumption of the air heater. With the increasingly stringent national energy saving and emission reduction policies, the heat source of the air heater has developed from high-grade auxiliary steam to low-grade extraction steam or even hot water. [0003] Some power plants change the heat source of the air heater to steam turbine five-stage or even six-stage steam extr...

AI Technical Summary

Problems solved by technology

However, in actual operation, it is found that the energy-saving effect is not obvious when using the five-stage steam extraction of the steam turbine; while the hot water heated by the six-stage steam extraction of the steam turbine or the waste heat of the flue gas or the hot water of the low-heating system often freezes in winter, Causes the phenomenon of frozen pipes in the air heater. After the frozen pipes of the air heater are broken, the condensed water of the air heater will leak, which will endanger the operation of the air preheater. After the condensed water of the air heater leaks, it cannot be repaired online. column, further compromising the operation of the air preheater

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