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Lignite drying device by aid of low-pressure superheated steam and method

A technology of superheated steam and drying equipment, which is applied in the direction of heating equipment, drying gas arrangement, heating to dry solid materials, etc., and can solve problems such as uncertain temperature

Active Publication Date: 2012-07-11
天津格物兴业热能科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem with this method is that when using the superheated steam produced by the previous stage dryer as the heating medium of the next stage dryer, it is not sure whethe

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  • Lignite drying device by aid of low-pressure superheated steam and method
  • Lignite drying device by aid of low-pressure superheated steam and method
  • Lignite drying device by aid of low-pressure superheated steam and method

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specific Embodiment approach

[0054] The technological process and specific implementation of the low-pressure superheated steam drying lignite device related to the present invention are:

[0055] At the beginning of the drying device's work, the heat transfer oil heating system provides high-temperature heat transfer oil to the drying device as its main heat source to preheat the heat transfer oil heater 1 . A small amount of preheated wet lignite is sent down from the top feed hopper 11 of the heat transfer oil heater 1 into the preheated heat transfer oil heater, and the temperature of the lignite is raised until the external water evaporates, and the generated steam continues to be heated And when it is superheated to 120°C, the low-pressure superheated steam is boosted by the circulating superheated steam booster fan 2 and heated by the circulating superheated steam reheater 3, and then used as the drying medium and supplementary heat source of the drying device, it is sent from the lower part of the ...

Embodiment 1

[0068] For lignite with a moisture content of 30%, the particle size is not greater than 10mm, and the minimum distillation temperature of the volatile fraction is 210°C. The moisture content of the dried material is required to be less than 10%, and the processing capacity of a single drying device is 1,000 tons per day.

[0069] The characteristics of the dried lignite are: the moisture content does not exceed 30%, and includes external moisture and internal moisture. During the drying process, it is easy to remove the external moisture, but it is difficult to remove the internal moisture, and the chemical properties of the lignite are unstable, which affects the properties of the drying medium and The operating temperature is more sensitive. The drying process has a large amount of water removal, but the moisture content of the dried lignite is not too high. It is necessary to increase the temperature and flow rate of the drying medium in the constant-rate evaporation sectio...

Embodiment 2

[0082] For lignite with a moisture content of 43%, the particle size is not greater than 20mm, and the minimum distillation temperature of the volatile fraction is 220°C. The moisture content of the dried material is required to be less than 10%, and the drying device has a processing capacity of 1,500 tons per day.

[0083] The characteristics of dried lignite are: the moisture content is as high as 43%, and it includes external moisture and internal moisture. During the drying process, it is easy to remove external moisture, but it is difficult to remove internal moisture. Its particle size is uneven, and lignite with larger particle size is more difficult to dry. . In addition, the chemical properties of lignite are unstable and sensitive to the properties of drying medium and working temperature. Due to the large amount of lignite to be processed and the moisture content of the dried lignite is very high, the amount of water removed in the drying process is relatively larg...

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Abstract

The invention relates to a lignite drying device by the aid of low-pressure superheated steam and a method. An inner heating mode is particularly adopted for the drying device, heating is realized and the low-pressure superheated steam is generated in a lignite drying process, the low-pressure superheated steam is properly superheated and used as a circulating drying medium inside the drying device, the drying medium directly contacts with lignite which moves from top to bottom when the drying medium flows from bottom to top, and purposes of heating and drying the lignite are achieved by the aid of convection heat transfer and mass transfer diffusion between the drying medium and the lignite. The lignite drying device and the method are characterized in that automatic control of the lignite drying process is realized by means of regulating the temperature of the drying medium and transferred heat of the drying medium inside the drying device, and effects of improving drying capacity and heat efficiency of the lignite drying device by the aid of the low-pressure superheated steam are realized.

Description

technical field [0001] The present invention relates to a lignite drying device and method, specifically adopting the internal heating mode of the drying device, heating and generating low-pressure superheated steam in the process of drying lignite, and using the generated low-pressure superheated steam as the internal drying medium, and the drying medium is from the bottom While the upper flow is in direct contact with the lignite moving from top to bottom, through the convective heat transfer and mass transfer diffusion between the two, the purpose of heating and drying the lignite is achieved. At the same time, the low-pressure superheated steam distribution and recovery system is used for the drying device The remaining steam discharged is used for recovery of waste heat and condensed water, so that the lignite drying process can achieve the comprehensive effects of high efficiency, energy saving, environmental protection and water storage. technical background [0002] ...

Claims

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Application Information

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IPC IPC(8): F26B17/14F26B23/10F26B21/04F26B21/06F26B25/00F26B3/00
Inventor 李树田
Owner 天津格物兴业热能科技有限责任公司
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