High-moisture-content lignite predrying method and system integrated with thermal power plant

A thermal power plant, pre-drying technology, used in drying solid materials, drying gas layout, heating to dry solid materials, etc., can solve the problems of power station efficiency discount, promotion and application restrictions, etc., to improve efficiency, reduce moisture, and increase temperature. horizontal effect

Inactive Publication Date: 2012-02-15
XI AN JIAOTONG UNIV
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Problems solved by technology

But on the one hand, the steam compression process needs to consume a considerable amount of high-grade mechanical work, which greatly reduces the efficiency of the power station; on the other hand, there a

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  • High-moisture-content lignite predrying method and system integrated with thermal power plant
  • High-moisture-content lignite predrying method and system integrated with thermal power plant
  • High-moisture-content lignite predrying method and system integrated with thermal power plant

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Embodiment Construction

[0026] In order to understand the present invention more clearly, the present invention will be described in further detail below in conjunction with accompanying drawing:

[0027] The following are the system connection schematic diagrams for the two air heating schemes, among which scheme 1 is as follows figure 1 As shown, scheme 2 is as figure 2 shown.

[0028] For the two schemes, the following system connection methods are the same, see figure 1 , figure 2 : The steam outlet of the boiler is connected to the steam inlet of the steam turbine, and the exhaust steam at the outlet of the steam turbine is connected to the condenser, and the condensed water at the outlet of the condenser passes through the condensate pump, the low-pressure heater, the deaerator, the feed water pump, and the high-pressure heater in sequence Going back to the feed water inlet of the boiler, the steam extraction ports of different parameters on the steam turbine are respectively connected to th...

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Abstract

The invention discloses a high-moisture-content lignite predrying method and system integrated with a thermal power plant. In the method, lignite is dried by using hot air as a fluidizing agent and a drying medium in a fluidized bed dryer; and a heater is built in the fluidized bed dryer to supply partial heat for drying. The lignite predrying system integrated with the thermal power plant comprises the fluidized bed dryer, the heater built in the dryer, a deduster, a gas-gas heat exchanger, a gas-water heat exchanger, an air heater and a fan. According to the system, waste heat in the system and low-grade heat energy in the power plant are fully utilized to dry the lignite. By applying the method and the system disclosed by the invention, the moisture content of the lignite fed into a furnace can be reduced, the heat loss of a boiler due to exhaust gas can be reduced, and the efficiency of the lignite boiler is increased; the low-grade heat energy and waste heat resources in the thermal power plant are fully utilized, so that the consumption of high-grade energy sources in a drying process is reduced, and the power generation efficiency of a lignite power plant is increased.

Description

technical field [0001] The invention belongs to the field of coal-fired thermal power generation systems, and relates to a method and system for pre-drying high-moisture lignite. Background technique [0002] At present, in most lignite power plants, lignite with a moisture content of 30% to 50% is not pre-dried, but is directly in contact with the high-temperature flue gas extracted from the furnace in the coal mill to achieve the purpose of drying, and the flue gas used for drying And the water vapor produced by drying is sent into the furnace together with the pulverized coal, resulting in a decrease in furnace temperature, poor combustion stability, increased flue gas volume, a corresponding increase in furnace cross-sectional area and volume, and increased boiler manufacturing and installation costs. At the same time, the exhaust heat loss increases, and the thermal efficiency of the boiler decreases, which in turn reduces the power generation efficiency of the power pl...

Claims

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Application Information

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IPC IPC(8): F26B3/084F26B3/092F26B21/00F26B25/00F22D11/06F01K11/02
Inventor 车得福胡商建刘银河
Owner XI AN JIAOTONG UNIV
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