Low-pressure economizer with finned tubes

Abstract

A low-pressure economizer with finned tubes consists of an inlet header (1), finned tube rows (2) and an outlet header (3). The finned tube rows (2) are divided into the upper section and the lower section, the inlet header (1) is connected with the front six finned tube rows of the upper section, and the outlet header (3) is connected with the rear six rows of the finned tube rows (2). The low-pressure economizer is characterized in that the upper section of the finned tube rows (2) and the lower section thereof are welded integrally by an installation weld junction (4). The front six finned tube rows are made of ND steel, so that low-temperature corrosion is decreased, and the service life of the low-pressure economizer is prolonged. Due to the finned tubes of the new specification, heat exchange area is guaranteed while ash accumulation is reduced, and the low-pressure economizer stays at the best state for exhaust heat recovery.

Description

technical field [0001] The invention relates to the field of waste heat utilization of boilers, in particular to a novel finned tube low-pressure economizer. Background technique [0002] The low-pressure economizer is a kind of exhaust waste heat utilization equipment widely used in recent years. Its working medium inlet and outlet are connected to the low-pressure heating area of ​​the steam turbine thermal system, that is, the condensed water from a certain level of low-pressure heater enters the layout It is heated in the low-pressure economizer after the air preheater, and the heated water is returned to the low-pressure heating system. The energy-saving principle is to use the exhaust heat of the boiler to heat the condensed water, which is equivalent to pure heat entering the thermal system. Known conventional low-pressure The economizer has the following disadvantages in operation: firstly, the problem of corrosion, because it is arranged in the low smoke temperature...

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Problems solved by technology

[0002] The low-pressure economizer is a kind of exhaust waste heat utilization equipment widely used in recent years. Its working medium inlet and outlet are connected to the low-pressure heating area of ​​the steam turbine thermal system, that is, the condensed water from a certain level of low-pressure heater enters the layout It is heated in the low-pressure economizer after the air preheater, and the heated water is returned to the low-pressure heating system. The energy-saving principle is to use the exhaust heat of the boiler to heat the condensed water, which is equivalent to pure heat entering the thermal system. Known conventional low-pressure The economizer has the following disadvantages in operation: firstly, the problem of corrosion, because it is arranged in the low smoke temperature area at the tail of the boiler, corrosion will inevitably occur; secondly, due to the use of finned tubes to increase the heat exchange area, it is inevitable Dust accumulation occurs, which makes the recovery of waste heat by finned tubes deviate from the optimal state

Increased fin spacing can reduce dust accumulation, but will reduce the heating area

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