Cold and hot flue gas drying lignite medium speed pulverization system

A flue gas and drying technology, which is applied in the direction of drying gas arrangement, drying, dryer, etc., can solve the problems of large flue gas recirculation process, aggravated coking tendency, and hidden safety hazards, so as to improve the adaptability of coal types and reduce the Oxygen content, safety improvement effect

Active Publication Date: 2015-09-09
HULUDAO HUANENG IND CERAMIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a medium-speed pulverization system for drying lignite with cold and hot flue gas. In order to solve the problem that the flue gas recirculation process of the existing pulverization system is relatively large, which has a great influence on the main parameters of the boiler, and also intensifies the heating of the boiler. surface wear, aggravate the tendency of coking, affect the efficiency of the boiler and have great potential safety hazards

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  • Cold and hot flue gas drying lignite medium speed pulverization system

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specific Embodiment approach 1

[0011] Specific implementation mode one: combine figure 1 Describe this embodiment, the system of this embodiment comprises boiler 1, electric precipitator 2, boiler induced draft fan 3, chimney 4, primary fan 14, air preheater 15 and hot blast pipeline 16, one end of electric precipitator 2 and The tail flue of the boiler 1 is connected, the electrostatic precipitator 2 is connected with the inlet end of the boiler induced draft fan 3, the outlet end of the boiler induced draft fan 3 is connected with the chimney 4, and the primary fan 14 is connected with the hot air pipeline 16 through the air preheater 15 One end is connected, and the system also includes a cold smoke pipeline 5, a hot furnace smoke exhaust port 6, a hot furnace smoke pipeline 7, a mixing and boosting pipeline 9, an ash and slag removal device 10, a hot smoke blower 12 and a medium-speed mill The coal machine 18 is provided with a hot furnace smoke exhaust port 6 between the burner of the boiler 1 and the ...

specific Embodiment approach 2

[0013] Specific implementation mode two: combination figure 1 Describe this embodiment, the system of this embodiment also includes a first electric control valve 8, the cold smoke pipeline 5 is provided with a first electric control valve 8, the advantage of this structure is to regulate the cold smoke entering the mixing increase pipeline 9 amount. Other implementation manners are the same as the specific implementation manner 1.

specific Embodiment approach 3

[0014] Specific implementation mode three: combination figure 1 Describe this embodiment, the system of this embodiment also includes a second electric regulating valve 11, a second electric regulating valve 11 is arranged between the ash and slag removal device 10 and the hot smoke blower 12, the advantage of this structure is to adjust the mixing The amount of flue gas entering the hot air hood 12. Other implementation modes are the same as the specific implementation mode 1 or 2.

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Abstract

The invention discloses an intermediate-speed powder milling system capable of drying lignite by using cold and hot smoke, and relates to a power making system capable of drying lignite by using smoke. The system solves the problems of the existing powder making system that a gas recirculation flow path is large, a principal parameter of a boiler is seriously influenced, the abrasion of a heated face of the boiler is also aggravated, a coking trend is aggravated, the boiler efficiency is affected, and the serious potential safety hazards are generated. According to the system provided by the invention, a hot furnace smoke pumping port is arranged between a combustor of a boiler and a furnace hopper, one end of a hot furnace smoke pipeline is communicated with the hot furnace smoke pumping port, the other end of an induced draft fan of the boiler is communicated with one end of a cold smoke pipeline, the other end of the cold smoke pipeline and the other end of the hot furnace smoke pipeline are both communicated with one end of a mixing pressurization pipeline, the other end of the mixing pressurization pipeline is communicated one end of a hot smoke fan through an ash removing deslagging device, and the other end of the hot smoke fan and the other end of a hot air pipeline are both communicated with a primary air inlet of an intermediate-speed coal milling machine. The intermediate-speed powder milling system provided by the invention is used for dried lignite.

Description

technical field [0001] The invention relates to a flue gas drying lignite pulverization system. Background technique [0002] Lignite is a coal with a short formation time in coal resources and the mineral coal with the lowest degree of coalification. It is the initial product of peat deposition and dehydration and compaction into organic biorock. It is named for its brown or dark brown appearance. Lignite is mainly used as fuel in power plants, but also in fields such as the chemical industry. Lignite has high volatile content (dry ash-free base volatile content Vdaf > 37%), high moisture content (over 30% total moisture content), and low calorific value (Qar, net = 11000-15000 kJ / kg). Lignite is prone to spontaneous combustion due to its high oxygen content (Oar=8%-12%) and high volatile content. Lignite tends to lose moisture and mechanical strength in the atmosphere and become debris. The characteristics of lignite determine that its pulverizing system has certain ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23K1/00F26B21/14
Inventor 冯万春康达李景彬刘延滨王秀江
Owner HULUDAO HUANENG IND CERAMIC
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