Pre-drying brown coal power generation system integrated with first-class absorption heat pump and pre-drying brown coal power generation method

An absorption heat pump and power generation system technology, applied in heating to dry solid materials, drying solid materials, drying, etc., can solve the problem of low thermal efficiency of lignite-fired boilers

Active Publication Date: 2015-12-23
XI AN JIAOTONG UNIV
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Problems solved by technology

The total moisture of lignite is generally 30% to 60%. High moisture content leads to low thermal efficiency of lignite-fired boilers, which is the main factor restricting the application of lignite in the field of thermal power generation.

Method used

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  • Pre-drying brown coal power generation system integrated with first-class absorption heat pump and pre-drying brown coal power generation method

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0028] Such as figure 1 As shown, the present invention is a pre-dried lignite power generation system integrating the first type of absorption heat pump, including a coal-fired coal-fired system consisting of a boiler 1, a steam turbine 2, a generator 3, a condenser 4, a cooling tower 5 and a heat recovery system, etc. The power generation system also includes a drying system of a steam fluidized bed dryer with a built-in heater and a heat pump system used to recover the waste heat of the drying tail gas and the exhaust heat of the steam turbine.

[0029] Specifically, the heat recovery system includes first-stage and second-stage low-pressure heaters, deaerators, and first-stage to third-stage high-pressure heaters connected in sequence. The first type of absorption heat pump 6 includes an absorber 10, a generator 11, condenser 12, evaporator 13, absorber ...

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Abstract

The invention discloses a pre-drying brown coal power generation system integrated with a first-class absorption heat pump and a pre-drying brown coal power generation method. The system mainly comprises such apparatuses as a traditional coal-fired power generation system, a steam fluidized-bed dryer with a built-in heater and the first-class absorption heat pump. According to the method, dry tail gas is used as a fluidizing and drying medium in the fluidized-bed dryer. The extracted steam of one stage of a steam turbine low-pressure cylinder flows through the built-in heater of the dryer to provide heat needed by evaporating moisture in brown coal. The dry tail gas serves as a high-temperature heat source for the heat pump, and turbine steam exhaust serves as a low-temperature heat source for the heat pump to generate low-temperature steam at a temperature between the temperatures of the dry tail gas and the turbine steam exhaust for heating the condensed water of the power generation system. The system is capable of reducing the steam extraction amount of a heat regenerative system, reducing the amount of waste heat emitted by the power generation system to the environment, realizing the utilization of the waste heat of the dry tail gas and the turbine steam exhaust and improving the efficiency of the power generation system.

Description

Technical field: [0001] The invention belongs to the field of coal-fired thermal power generation, and in particular relates to a pre-drying lignite power generation system and method integrating a first-type absorption heat pump. Background technique: [0002] Lignite has a low degree of coalification, and is characterized by high moisture content, high volatile matter content, high ash content, low calorific value, and easy spontaneous combustion and weathering. The total moisture of lignite is generally 30% to 60%. High moisture content leads to low thermal efficiency of lignite-fired boilers, which is the main factor restricting the application of lignite in thermal power generation. [0003] Pre-drying lignite before burning can effectively reduce boiler efficiency and power generation efficiency. However, drying is a high energy-consuming process. It is of great significance to improve the power generation efficiency of lignite power plants by trying to use the waste ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D15/10F01K11/02F01K17/02F22D1/00F26B3/08
Inventor 车得福朱信张涛王利民唐春丽
Owner XI AN JIAOTONG UNIV
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