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Industrial Boiler Condensate Waste Heat Utilization and Recycling of Integrated Device Research

Author: DuYuHui
Tutor: LouBo；LiMaoDong
School: South China University of Technology
Course: Power Engineering
Keywords: Industrial boiler Closed Condensate Recovery Water purification Waste heat recovery Boiler feed wate
CLC: TK115
Type: Master's thesis
Year: 2011
Downloads: 178
Quote: 1
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Abstract


Industrial boiler condensate recovery is one of the important ways to improve boiler thermal efficiency and reducing energy consumption .Steam heat includes sensible heat and latent heat. Steam equipment usually used steam latent heat and a small amount of sensible heat. The steam has a high-temperature condensation after the release of latent heat and a small amount of sensible heat. Condensate is saturate softened water with a high-temperature , and take about 25% heat energy of steam, suited for boiler feed water again for clean distilled water. after the release of latent heat of vaporization , the Steam becomes almost the same temperature and pressure of saturated condensate in the steam equipment. The heat of Condensation water is increase with pressure and temperature, and has a higher proportion of total calories. Condensate is pure distilled water in theory, suited for boiler feed water .But in the fact, It easy lead to the industrial boiler steam condensate low pH, , high oxygen content because of the industrial boiler feed water softened and the oxygen process is imperfectmake severe acid corrosion and oxygen corrosion, which is the main reason for the condensation water pollution. In addition, the steam heat exchanger stops, frequently resulting in thermal stress caused in recovery equipment, pipe leakage and resulting in non-condensable gas mixed with impure substances and condensed water pollution. The research focused on the characteristics of the current condensate system, which can resolve the current industrial boiler condensate recovery problems such as: flash loss, water purification, piping system corrosion major shortcomings. By studying the development of an integrated closed condensate recovery unit, including heat recovery, water purification and corrosion in one system. this treatment device not only put the heat of condensation of water has been used, and water suit for GB / T 1576-2008《Industrial Boiler Water Quality》requirements,but also directly as boiler feed delivery. Eliminate the boiler corrosion problems in for increasing the boiler fouling rate and impurities in some of current condensate recovery ,and get a good energy efficiency, water conservation, environmental protection. The key of this study is the system closed and without contact air in purification condensate recovery, and purify the recycling water the system has corrosion prevention. Based on scientific theory of rational recovery system design and research, we will get to choose the right cleaning anti-corrosion technology. Meanwhile, as a complete system engineering, closed recycling condensate purification system not only capable of solving water hammer, pump cavitations, high and low pressure mixed network, but also need to considerate collection in heating, drainage devices, collect device, pipe network, water treatment equipment, control systems, in the end for attaining maximize system efficiency and advantages.

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CLC: > Industrial Technology > Energy and Power Engineering > Thermal engineering, heat > Heat > Waste heat utilization
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