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Air preheating system and method performing steam extraction by utilizing steam turbine

A technology of air preheating and steam turbine, which is applied in the direction of preheating, steam generation, feed water heater, etc. It can solve the problems of inapplicable air preheating of thermal power generating units and the inability to meet the air and air preheating requirements of thermal generating units, and achieve air leakage Effects of problem solving, reduction of coal consumption for power generation, and avoidance of air leakage

Inactive Publication Date: 2013-08-14
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

However, it is only designed for industrial boilers. It uses fresh steam and return water from steam equipment to heat the air up to about 150 degrees Celsius, which cannot meet the air preheating requirements of thermal power generating units. Water is not suitable for air preheating of thermal power generating units

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  • Air preheating system and method performing steam extraction by utilizing steam turbine

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Embodiment Construction

[0025] The present invention provides an air preheating system and a preheating method for heating air by steam extraction from a steam turbine. The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] Taking the simulation application of a 1000MW large-scale coal-fired generating set as an example, see the connection method figure 1 . The system replaces the three-chamber rotary air preheater in the tail flue of the original unit with the air preheating system proposed by the invention using the steam extraction of the steam turbine, and is coupled and integrated with the heat recovery system of the original unit.

[0027] The main steam pipeline 3 of the boiler 1 is connected with the high-pressure cylinder 4 of the steam turbine, the reheat steam pipeline 2 is connected in series with the medium-pressure cylinder 5 of the steam turbine and the low-pressure cylinder 6 of the steam turbine, and the ...

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Abstract

The invention relates to an air preheating system of a thermal power generator set, in particular to an air pre-heating system and method performing steam extraction by utilizing a steam turbine. In the system, a primary air preheating subsystem and a secondary air preheating subsystem are coupled with a boiler system and a steam turbine system of the thermal power generator set to form a novel boil feed water preheating system. Primary air is heated by a four-stage air heater and a first-stage drain water cooler to reach primary air rated temperature. Secondary air is heated by a five-stage air heater to reach a secondary air rated temperature. The air preheating system effectively solves the air leakage problem, reduces operation power consumption of a primary fan, a forced draught blower and an induced draft fan and improves the generating efficiency of a coal-fired power plant. In addition, the primary air temperature and the secondary air temperature can be flexibly adjusted by adjusting steam extraction volume of the air heaters and opening degree of a drain water by-pass valve.

Description

technical field [0001] The invention relates to an air preheating system of a thermal power generating set, in particular to an air preheating system and a preheating method utilizing a steam turbine to extract steam. Background technique [0002] Limited fossil fuel resources and rising fuel prices are driving the continuous technological innovation and progress of thermal power generation units. Currently, thermal power generation units are developing in the direction of large-scale high-parameters. The efficiency of thermal power generating units still needs to be further improved by improving equipment and optimizing system design. [0003] As a means to improve the efficiency of thermal power generation units, air preheating has been widely used in the thermal power generation industry. The traditional air preheating method is to use the flue gas with a higher temperature in the tail flue of the boiler to heat for the transportation of pulverized coal. The cold primary...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22D1/36
Inventor 杨勇平吴令男王利刚董长青徐钢杨志平王洋高静
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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