Low-energy-consumption lignite drying process for recovering lignite moisture and drying equipment

A technology of drying equipment and drying process, which is applied in the direction of drying solid materials, drying gas arrangement, lighting and heating equipment, etc. It can solve the problems of ineffective recovery of water, ineffective use of secondary steam, and low energy utilization efficiency in the drying process. Achieve the effect of high usable value, reduce the consumption of steam for external use, and improve the efficiency of energy utilization

Inactive Publication Date: 2013-12-18
WUHAN INSTITUTE OF TECHNOLOGY
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0008] All current drying and pre-drying methods, including tube dryer drying, rotary drum drying, and steam fluidized bed drying, cannot effectively utilize the energy of the secondary steam produced by drying, so the energy utilization efficiency of the drying process is low; currently all Drying and pre-drying methods, except for steam fluidized bed drying, cannot effectively recover the moisture removed from lignite during the drying process

Method used

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  • Low-energy-consumption lignite drying process for recovering lignite moisture and drying equipment
  • Low-energy-consumption lignite drying process for recovering lignite moisture and drying equipment
  • Low-energy-consumption lignite drying process for recovering lignite moisture and drying equipment

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Embodiment 1

[0037] This embodiment is a lignite pre-drying process for recovering lignite drying moisture. The lignite processing capacity is 5 million tons / year, and its technological process is shown in figure 1 .

[0038] The lignite pre-drying process for recovering dry moisture mainly includes: lignite pretreatment, lignite moving bed pre-drying, secondary steam condensate recovery, and heating steam condensate recovery.

[0039] 1. Lignite pretreatment system: the lignite with rich water content of 15wt% ~ 55wt% and coal particle size ≤ 300mm from the boundary area enters the raw coal silo, and is sent to the double-roller crushing through the unloading belt conveyor and the feeding belt conveyor Machine, the double-roll crusher with high-alloy material crushes the material to the size of the gap between the two rolls. The crushed coal particles are less than or equal to 30mm, and the crusher is sent to the silo through the feeding belt conveyor, and the coal particles from the si...

Embodiment 2

[0053] This embodiment is a lignite pre-drying process using secondary steam boosting as a drying heat source. The lignite processing capacity is 5 million tons / year, and its technological process is shown in figure 2 .

[0054] The lignite pre-drying process with secondary steam boosting as the drying heat source mainly includes: lignite pretreatment, moving bed drying system pre-drying, secondary steam boosting and reuse as heating steam, and recovery of heating steam condensate.

[0055] 1. Lignite pretreatment system: the lignite with rich water content of 15wt% ~ 55wt% and coal particle size ≤ 300mm from the boundary area enters the raw coal silo, and is sent to the double-roller crushing through the unloading belt conveyor and the feeding belt conveyor Machine, the double-roll crusher with high-alloy material crushes the material to the size of the gap between the two rolls. The crushed coal particles are less than or equal to 30mm, and the crusher is sent to the silo...

Embodiment 3

[0069] In this embodiment, a three-stage non-isobaric lignite pre-drying process is adopted. The lignite processing capacity is 5 million tons / year, and its technological process is shown in image 3 .

[0070] The lignite pre-drying process of the three-stage non-isobaric drying heat source mainly includes: lignite pretreatment, lignite moving bed pre-drying, and steam condensate recovery.

[0071] 1. Lignite pretreatment system: the lignite with rich water content of 15wt% ~ 55wt% and coal particle size ≤ 300mm from the boundary area enters the raw coal silo, and is sent to the double-roller crushing through the unloading belt conveyor and the feeding belt conveyor Machine, the double-roll crusher with high-alloy material crushes the material to the size of the gap between the two rolls. The crushed coal particles are less than or equal to 30mm, and the crusher is sent to the silo through the feeding belt conveyor, and the coal particles from the silo enter the relaxation ...

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Abstract

The invention relates to the technical field of lignite drying and comprehensive high-efficiency utilization of lignite, and discloses a low-energy-consumption lignite drying process for recovering lignite moisture and drying equipment. The drying equipment disclosed by the invention comprises a drier for realizing the indirect heating by steam. The lignite drying process comprises the steps that steam is used as heating media, and the steam enters the drier to carry out drying heat exchange with the lignite in the drier; and meanwhile, moisture removed from the lignite is heated to become secondary steam, and the secondary steam realizes the gas-solid separation through an outer sleeve made of porous gas-solid separation materials, and are discharged out of the drier to be recovered and utilized. The process and the equipment have the advantages that the moisture removed from the lignite can be recovered, and meanwhile, the energy consumption in the drying process can also be reduced, so the energy utilization efficiency, the resource utilization efficiency and the environmental protection benefit of the comprehensive utilization items of the lignite are improved.

Description

technical field [0001] The invention relates to the technical field of lignite drying and its comprehensive high-efficiency utilization, in particular to a drying process and equipment for lignite with high water content. Background technique [0002] Lignite is a kind of coal with high volatile content (about 50%), high moisture content (above 30%), and low calorific value (about 14MJ / kg). Because of its low calorific value, easy spontaneous combustion, and unsuitable for long-distance transportation, lignite has long been regarded as a low-quality coal resource. Worldwide, the development and utilization of lignite is not high. In China, lignite is currently mainly used as fuel for pit-mouth power plants and raw materials for pit-mouth gasification. [0003] China is rich in lignite resources, with proven reserves of 130.3 billion tons, accounting for about 13% of the country's coal reserves, mainly concentrated in Inner Mongolia, Heilongjiang and Yunnan provinces, among...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B21/00F26B25/00F28D7/10
Inventor 王存文皮金林汪寿建
Owner WUHAN INSTITUTE OF TECHNOLOGY
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