Heat conduction oil heat storage and boiler low temperature corrosion prevention device and working method

Abstract

The invention discloses a heat conduction oil heat storage and boiler low temperature corrosion prevention device and a working method. The device comprises a photovoltaic cell panel, wherein the photovoltaic cell panel is connected with a storage battery, the output end of the storage battery is connected with a heat conduction oil tank used for heating heat conduction oil or insulating the heatconduction oil, and in addition, a solar heat collector is arranged to provide heat for the heat conduction oil. An outlet of the heat conduction oil tank is connected with a heat conduction oil inletof an oil-smoke heat exchanger. The oil-smoke heat exchanger penetrates through a tail flue, and an air preheater is also arranged in the tail flue. The oil-smoke heat exchanger is located at the smoke inlet end of the air preheater, smoke absorbing heat conduction oil heat enters the air preheater, the device directly exchanges heat through the heat conduction oil and the smoke in the tail fluewithout contacting with the smoke, other structures of a boiler do not need to be adjusted, and expensive materials are not used for corrosion prevention. The heat conduction oil heat storage and boiler low temperature corrosion prevention device is low in cost, few in transformation, low in transformation cost, short in implementation period, simple in structure and capable of easily achieving industrialization.

Description

Technical field [0001] The invention belongs to the technical field of power station boilers and industrial boilers, and in particular belongs to a low-temperature corrosion prevention device and working method for boilers that store heat by conducting oil. Background technique [0002] The sulfur in the fuel burns to produce sulfur dioxide (S+O 2 =SO 2 ), part of the sulfur dioxide will be oxidized to SO in the furnace 3 (2SO 2 +O 2 =2SO 3 ). For boilers equipped with SCR denitrification device, the catalyst is reducing NOx to N 2 At the same time, about 1.0% of SO 2 Oxidized to SO 3 , Leading to SO 3 The amount of production is greater. While SO 3 With the water vapor in the flue gas to generate sulfuric acid vapor (SO 3 +H 2 O=H 2 SO 4 ). The presence of sulfuric acid vapor significantly increases the dew point of flue gas. Due to the low temperature at the air inlet end of the air preheater, the temperature of the flue gas in the preheater section is not high, and the wall ...

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Problems solved by technology

[0004] In order to solve the problems existing in the prior art, the purpose of the present invention is to solve the problem that the flue gas temperature in the preheater section of the boiler is not high, the wall temperature is often lower than the flue gas dew point, and the heating surface of the air preheater is prone to low-temperature corrosion

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