Phase difference regenerative air preheater and preheating method

Abstract

The invention discloses a phase difference regenerative air preheater. The preheater comprises a high-temperature flue, high-temperature four-way valves, a high-temperature air flue, a body, a low-temperature flue, low-temperature four-way valves and a low-temperature air flue which are arranged in a sequentially overlaid way from the upper part to the lower part, wherein the main body of the body is a heat storage tank; baffles are arranged inside the heat storage tank, so as to divide the heat storage tank into even numbered of regenerative chambers; an upper flue / air flue outlet is formed in the top of each regenerative chamber; a lower flue / air flue outlet is formed in the bottom of each regenerative chamber; the high-temperature four-way valves and the low-temperature four-way valves form a plurality of heat transfer units; the commutation cycle of all the heat transfer units are the same; the phase time difference of switching time exists between the high-temperature four-way valves and the low-temperature four-way valves and that of other heat exchange units, the application of the reversing regenerative air preheater pm a flue gas residual heat recycling device of a petrifaction heating furnace can be realized, and requirements on stable pressure and temperature for combustion air of a petrifaction heating furnace combustor are achieved.

Description

technical field [0001] The invention relates to an air preheating device and an air preheating method for recovering flue gas waste heat of a petrochemical flame heating furnace, in particular to a phase difference regenerative air preheater and the preheating method adopted therein. Background technique [0002] The air preheaters used in petrochemical flame heating furnace flue gas waste heat recovery, such as heat pipe type, tube type, cast iron plate type, glass plate type and other preheaters, all have certain shortcomings, such as: the exhaust gas temperature is limited by the low temperature dew point corrosion temperature If the temperature is controlled above the dew point, the heat exchange element is easily corroded, the scaling efficiency decreases during use, the element is deformed and leaks air, the medium deteriorates and other reasons cause failure, the heat exchange efficiency is reduced, and the equipment maintenance and repair cost is relatively high. Alt...

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Problems solved by technology

[0002] The air preheaters used in petrochemical flame heating furnace flue gas waste heat recovery, such as heat pipe type, tube type, cast iron plate type, glass plate type and other preheaters, all have certain shortcomings, such as: the exhaust gas temperature is limited by the low temperature dew point corrosion temperature If the temperature is controlled above the dew point, the heat exchange elements are prone to corrosion, the fouling efficiency decreases during use, element deformation and air leakage, medium deterioration and other reasons cause failure, heat exchange efficiency decreases, and equipment maintenance and repair costs are relatively high

Although the rotary regenerative air preheater developed in the application of petrochemical heating furnaces in recent years has high efficiency and stable equipment operation, it has a large investment and a large rotary size of the equipment, which causes difficulties in the transportation of the equipment body

[0003] However, the reversing regenerative air preheater used in other industries generally occupies a large area due to the need for pairs of regenerative boxes and the corresponding regenerative combustion system, and when the four-way valve is reversing Furnace pressure fluctuates greatly, and the risk of flameout and backfire during burner operation is high, which affects safety

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