System for recovering water vapor in smoke and heat by membrane method and heat exchange module

Abstract

The invention discloses a system for recovering water vapor in smoke of a thermal power plane and heat based on a composite membrane, and a heat exchange module with a front-loaded air heater. A water recovery device adopts three-grade arrangement, and is provided with the front-loaded air heater for recovering the heat of the water vapor. A high-temperature water recovery device is arranged in front of an air preheater; the temperature of the recovered water vapor is higher; the recovered water vapor serves as a heat source of the air heater; a medium-temperature water recovery device is arranged in front of a desulfurization tower; the heat of the recovered water vapor serves as a heat source of the front-loaded air heater for heating environmental air; a low-temperature water recovery device is arranged behind the desulfurization tower; the temperature of the recovered water vapor is lower; and the recovered water vapor can be directly fed in a steam condenser for condensation. The heat exchange module with the front-loaded air heater mainly consists of a water vapor conveying pipe, an I-grade heat exchange module, an II-grade heat exchange module and a dewatering header. The system is huge in application potential on the aspects of water conservation and energy conservation.

Description

technical field [0001] The invention belongs to the technical field of water saving and energy saving in the thermal power generation industry. A heat utilization system is designed to use the heat of recovered water vapor to increase the temperature of the cold end of an air preheater. After the water vapor is condensed, it enters a condensed water system for recycling. The system not only recovers the moisture in the flue gas, but also effectively increases the temperature of the air entering the air preheater, reducing the low-temperature corrosion of the air preheater. Background technique [0002] As of the end of 2014, the installed capacity of thermal power generators in my country has exceeded 900 million kilowatts, accounting for about 67% of the total installed capacity. It can be seen that thermal power still occupies an absolute position in my country's power industry. Statistics show that my country's thermal power water consumption has always accounted for more...

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Problems solved by technology

In order to avoid the low-temperature corrosion of the air preheater, the commonly used method is to install the heater, whose heat source comes from the steam extraction of the steam turbine, which will reduce the working ability of part of the steam, resulting in insufficient work, reducing the power generation efficiency, and economical. Difference

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