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A pre-drying lignite power generation system and method with integrated air heater

A power generation system and air heater technology, which is applied in the direction of combustion method, dry solid material, dry gas arrangement, etc., can solve the problems of power generation system efficiency drop, steam turbine output drop, boiler exhaust gas temperature rise, etc., and achieve a shortened payback period , The effect of continuous and efficient operation of the power adjustment process

Active Publication Date: 2018-07-17
XI AN JIAOTONG UNIV
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  • Claims
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AI Technical Summary

Problems solved by technology

The traditional air heater uses steam extraction from the steam turbine as the heat source, but this will reduce the output of the steam turbine, and the operation of the air heater will increase the exhaust gas temperature of the boiler, reduce the efficiency of the boiler, and then lead to a decrease in the efficiency of the power generation system

Method used

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  • A pre-drying lignite power generation system and method with integrated air heater

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Embodiment Construction

[0026] The present invention will be described in further detail below in conjunction with accompanying drawing

[0027] Such as figure 1 As shown, a pre-drying lignite power generation system with an integrated air heater of the present invention includes a boiler 1, a steam turbine 2, a generator 24, a condenser 3, a cooling tower 4, a condensate pump 5, a heat recovery system, a drying system and a heating system. The wind system, according to the flow direction of the feed water, the heat recovery system includes the first to the third high pressure heaters 25-27, the deaerator 28 and the first to the fourth low pressure heaters 29-32 connected in sequence, and the drying system includes the raw coal preheating device 9, coal crusher 10, fluidized bed dryer with built-in heater 11, dust collector 12, blower fan 13, coal mill 14, the air heater system includes drying tail gas waste heat recovery device 6, first valve 15, second A pump 16 , a second pump 17 , a second valve...

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Abstract

The invention discloses a pre-drying brown coal power generation system integrated with an air heater and a pre-drying brown coal power generation method. The system comprises a coal-fired power generation system body, a brown coal preheater, a superheated steam fluidized bed drier with an internal heater, an air heater system body and the like. An outlet of the brown coal preheater is connected with an inlet of the superheated steam fluidized bed drier with the internal heater, an outlet of the drier is connected with an inlet of a coal mill, and part of moisture in brown coal is removed in the drier. A heat source inlet of the internal heater is connected with a steam extraction opening of a certain level of a turbine, and an outlet of the internal heater is connected with the hydrophobic side of a corresponding reheating heater. The operation mode of the air heater system changes according to different loads of the air heater. The air heater system can safely and efficiently work in different seasons under different brown coal moisture contents and different dry degrees, waste heat of smoke exhausted from a boiler and waste heat of dried tail gas can be utilized at the same time, and the adverse influence of operation of the air heater on power generation efficiency is eliminated.

Description

Technical field: [0001] The invention belongs to the field of coal-fired thermal power generation, in particular to a pre-drying lignite power generation system and method integrated with an air heater. Background technique: [0002] Lignite is a low-quality coal with high water content, high volatile matter content, high ash content, low calorific value, and easy spontaneous combustion. Lignite reserves are huge, easy to mine, and the price is generally low. The total moisture of lignite is generally 30% to 60%. Direct combustion will lead to low power generation efficiency, which restricts the application of lignite in the field of thermal power generation. my country's lignite is mainly distributed in the eastern part of Inner Mongolia, where the winter is cold and long. In order to ensure the safe operation of the air preheater, it is necessary to run the heater. The traditional air heater uses steam extraction from the steam turbine as the heat source, but this will r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B3/08F26B21/00F26B23/00F26B25/00F23K1/00F22D1/34
CPCF22D1/34F23K1/00F26B21/001F26B21/005F26B23/001F26B25/005Y02P70/10
Inventor 车得福朱信王长安唐春丽
Owner XI AN JIAOTONG UNIV
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