Lignite drum smoke pre-drying power generation integrated system and process
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An integrated system, drum dryer technology, applied in the direction of drying gas arrangement, drying, dryer, etc., can solve the problem of difficult to meet the drying output, and achieve the effect of reducing emissions and good economy.
Inactive Publication Date: 2012-10-31
NORTH CHINA POWER ENG
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For lignite whose coal moisture is below 40-45%, it can also solve the problem that the drying output of the medium-speed pulverizer of the lignite boiler is difficult to meet
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[0022] The invention proposes a system and a process method for integrating a lignite pre-drying system with a boiler combustion system. For the system and process of integrating the lignite pre-drying system with the medium-speed coal pulverization system and the boiler combustion system, please refer to Figure 4 As shown, the system has two parts: the boiler combustion system and the lignite pre-drying system. The lignite pre-drying system is connected in parallel to the boiler combustion system. Specifically, the boiler combustion system includes boiler coal hoppers 13 and boiler coal feeders 24 connected in sequence. , medium-speed coal mill 21, boiler 15, economizer 16, denitration device 17, air preheater 18, dust collector 19, induced draft fan 7, desulfurization device 5 and chimney 8, primary fan 22 and medium-speed coal mill 21 are connected, and the air heated in the air preheater 18 is sent to the medium-speed coal mill 21 at the same time. However, the lignite p...
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Abstract
The invention discloses a lignite drum smoke pre-drying power generation integrated system and a lignite drum smoke pre-drying power generation integrated process. A lignite drum smoke drying system is combined with a boiler combustion system of a thermal power plant. The lignite drum smoke pre-drying power generation integrated system comprises a boiler coal supply device, a boiler, an economizer, a denitration device, an air pre-heater, a dust collector, an induct draught fan, a desulphurization device, a lignite supply device, a drum dryer, a bag type dust coal collector and a pre-drying booster fan, wherein the boiler coal supply device, the boiler, the economizer, the denitration device, the air pre-heater, the dust collector, the induct draught fan and the desulphurization device are connected in sequence; the lignite supply device, the drum dryer, the bag type dust coal collector and the pre-drying booster fan are connected in sequence; a smoke outlet of the desulphurization device is also connected with a smoke inlet of the drum dryer; a discharge end of the drum dryer is connected with the boiler coal supply device; and an outlet of the pre-drying booster fan is connected with an inlet flue of the desulphurization device. Smoke of the boiler is partially split into the drum dryer to pre-dry the lignite raw material, the waste heat of the smoke of the power plant is fully utilized, the efficiency of the boiler is increased, the emission of combustion pollutants and carbon dioxide is reduced, and the coal moisture after pre-drying is reduced, so that the investment in the boiler and auxiliary equipment thereof is reduced.
Description
technical field [0001] The invention relates to a combustion system of a lignite power plant, a lignite flue gas pre-drying system and a process. Background technique [0002] In recent years, with the rapid development of my country's national economy, the demand for energy such as coal continues to expand, and energy shortage has become a reality. However, my country has a lot of lignite resources. How to efficiently utilize my country's rich lignite resources has always been one of the important issues in the development of thermal power design technology. [0003] The development of lignite resources has brought more and more attention to lignite drying technology. Most of the coal drying technologies used in coal preparation plants in my country use hot flue gas as the drying medium. In the past, domestic lignite drying was limited by the overall technical equipment level, and it was difficult to meet large-scale of industrial production. With the continuous improvemen...
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