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Composite utilization system for waste heat of exhaust fume of boiler

A flue gas waste heat and boiler technology, which is applied in lighting and heating equipment, combustion methods, indirect carbon dioxide emission reduction, etc. Coal consumption rate and the effect of improving boiler efficiency

Inactive Publication Date: 2015-03-25
ZHEJIANG ELECTRIC POWER DESIGN INST
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Problems solved by technology

After the boiler is equipped with a denitrification device, due to the existence of ammonia escape, ammonium bisulfate deposition will inevitably occur on the air preheater. Long-term operation will inevitably lead to an increase in the resistance of the air preheater and the increase in the power consumption of the fan. Therefore, it is necessary to increase the air preheater. Preheater inlet cold air temperature to reduce the deposition of ammonium bisulfate

Method used

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  • Composite utilization system for waste heat of exhaust fume of boiler

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Embodiment

[0019] figure 1 As shown, the system of the present invention mainly includes three main equipments: air preheater (1), flue gas-water heat exchange economizer (2) and air-water heat exchange heater (3), as well as the mutual connect.

[0020] Taking a million-dollar power plant as an example, through the flue gas-water heat exchanger (2), the heat of the flue gas at the outlet of the air preheater (1) is absorbed, the exhaust gas temperature is reduced from 157°C to 90°C, and the temperature of the water medium is reduced from Heating from 70°C to 120°C. The 120°C hot water at the outlet of the flue gas-water heat exchanger (2) is used to heat the secondary air before the inlet of the air preheater (1), heating the secondary air from 25°C to 100°C, and the remaining heat is used for heating Condensate in steam turbine recuperation system. :

[0021] Taking a million-dollar power plant as an example, according to preliminary calculations, the standard coal consumption for ...

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Abstract

The invention provides a composite utilization system for the waste heat of the exhaust fume of a boiler. The system comprises at least one air preheater, at least one fume-water heat exchange coal economizer, at least one air-water heat exchange air heater, and a connecting pipe for connecting the air preheater and the heat exchanger, wherein the fume-water heat exchange coal economizer is arranged behind the air preheater, fume is exhausted after the heat of the fume from an outlet of the air preheater is absorbed through the fume-water heat exchanger, and the waste heat of the fume is utilized to raise the temperature of the cold air and the temperature of the condensation water; the air-water heat exchange air heater is used for heating the cold air through water media. The system has the characteristics that the temperature of the cold air is raised, the deposition of ammonium bisulfate is relieved, the flue exhaust temperature is reduced, the efficiency of the boiler is improved, the condensation water is heated, and the water usage for a desulfurization system is saved.

Description

technical field [0001] The program research involves a boiler tail flue gas waste heat composite utilization system, which belongs to the technical field of thermal power plant design. Background technique [0002] In order to improve the status quo of pollution discharge, the current thermal power plants will be equipped with denitrification and other devices. After the boiler is equipped with a denitrification device, due to the existence of ammonia escape, ammonium bisulfate deposition will inevitably occur on the air preheater. Long-term operation will inevitably lead to an increase in air preheater resistance and fan power consumption. The cold air temperature at the inlet of the preheater is used to reduce the deposition of ammonium bisulfate. At the same time, the requirements for energy saving and consumption reduction of the unit are increasing day by day. In order to further reduce energy consumption and improve unit efficiency, higher requirements are put forward...

Claims

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Application Information

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IPC IPC(8): F23L15/00
CPCY02E20/34
Inventor 卞卡徐红波沈又幸李琪袁勤勇光旭程慧张卫灵田家平黄之成
Owner ZHEJIANG ELECTRIC POWER DESIGN INST
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