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System and method for pre-drying brown coal by utilizing waste heat of power station

A drying system, pre-drying technology, applied in the direction of heating to dry solid materials, combustion methods, drying solid materials, etc., to achieve the effect of alleviating wear and corrosion, high reliability, and small furnace size

Active Publication Date: 2014-05-28
SHANGHAI BOILER WORKS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many kinds of flue gas waste heat recovery devices at home and abroad, and it is an effective waste heat utilization method to pre-dry the moisture in lignite by using the waste heat of exhaust gas

Method used

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  • System and method for pre-drying brown coal by utilizing waste heat of power station

Examples

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Embodiment 1

[0043] figure 1 It is a schematic diagram of the system for pre-drying lignite by using the waste heat of the power station in this embodiment. The system for pre-drying lignite by using the waste heat of the power station is divided into two stages, including the first-stage drying system and the second-stage drying system, respectively Air and boiler tail exhaust are used as drying medium. figure 1 In the figure, boiler 1 is connected to steam turbine 2, and steam turbine 2 is connected to condenser 3, A is brown coal, B is wet coal, and C is dry coal.

[0044] The first-stage drying system includes a first-stage dryer 6 , an air heater 7 , a circulating fan 8 , a dehumidifier 9 , a first dust collector 10 , a blower 11 , and an induced draft fan 12 . Wherein, the drying medium is air, part of which comes from the surrounding environment, and part of which comes from the recycling of exhaust gas from the first stage dryer 6 .

[0045] The air in the environment enters from...

Embodiment 2

[0050] figure 2 It is a schematic diagram of the system for pre-drying lignite by using the waste heat of the power station in this embodiment. The system for pre-drying lignite by using the waste heat of the power station is divided into two stages, including the first-stage drying system and the second-stage drying system, respectively Use exhaust gas and air at the tail of the boiler as the drying medium. figure 1 In the figure, boiler 1 is connected to steam turbine 2, and steam turbine 2 is connected to condenser 3, A is brown coal, B is wet coal, and C is dry coal.

[0051] The first-stage drying system is composed of a first-stage dryer 6 and a second dust collector 4 . Among them, the drying medium is the flue gas at the tail of the boiler, and the flue gas at the tail of the boiler is directly extracted. The temperature of the flue gas is 100-150 ° C. The flue gas enters the first-stage dryer 6 to dry the lignite, mainly to achieve the purpose of removing the extern...

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Abstract

The invention provides a system for pre-drying brown coal by utilizing the waste heat of a power station. The system comprises two stages of drying systems, wherein the first-stage drying system comprises a first-stage dryer, a circulating fan is connected with the first-stage dryer through an air heater, the first-stage dryer is connected with a first dust collector and a dehumidifier, the first dust collector is connected with an induced draft fan, the dehumidifier is connected with the circulating fan, a forced draft fan is connected with the circulating fan, and the second-stage drying system comprises a second-stage dryer which is connected with an extracting opening of a boiler rear smoke channel and a second dust collector. The invention also provides a method for pre-drying the brown coal by utilizing the waste heat of the power station. The device provided by the invention overcomes the defects in the prior art and can be used for performing classification drying on the brown coal for effectively removing internal water and external water of the brown coal, the drying is complete, smoke waste heat is directly utilized, the heat recovery and utilization efficiency is high, and the safety of the brown coal drying process and the power generating efficiency of the brown coal power station are effectively improved.

Description

technical field [0001] The invention relates to a system and method for drying high-moisture lignite in a power station and recovering waste heat in the power station, and belongs to the technical field of coal-fired thermal power generation. Background technique [0002] Lignite is a low-rank coal, which is characterized by high moisture content, high volatile content, low calorific value, easy spontaneous combustion, and easy weathering. The total moisture of lignite is generally 30% to 60%, and the volatile content is generally greater than 40%. The high moisture content has caused certain difficulties to the transportation, storage, grinding and combustion of lignite, which is the main factor restricting the application of lignite in the field of thermal power generation. [0003] Before burning lignite with high moisture content, the moisture in it needs to be dried. Most of the existing lignite power stations are to dry lignite in coal mills. When lignite is dried in...

Claims

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Application Information

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IPC IPC(8): F26B3/00F23K1/04
CPCY02P70/10
Inventor 张建文满承波倪建军郑路邹海勇胡商建车得福
Owner SHANGHAI BOILER WORKS
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