Method and device for improving output of coal mill based on lignite coal pulverizing system
A technology of a pulverizing system and a coal mill, which is applied in the direction of grain processing, etc., can solve the problems of insufficient drying output of the pulverizing system, and achieve the effects of improving the combustion efficiency of the boiler, improving the safety, and increasing the output.
Pending Publication Date: 2020-05-19
北京蓝爱迪电力技术有限公司
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Problems solved by technology
The invention solves the technical problem that the drying output of the pulverizing system is insufficient when lignite is used as the main type of coal for combustion
Method used
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Embodiment 1
[0034] Such as figure 1 As shown, the pulverizing system of the present invention improves the output device of the coal mill, which includes: a grinding disc 11 is provided in the coal mill 8; nozzles 10 are arranged around the grinding disc 11; and a grinding roller 12 is provided on the upper end of the grinding disc 11 ; One end of the high-temperature superheated steam pipeline 2 is connected to the steam turbine 4, and the other end passes through the wall 9 of the coal mill, and then passes through the gap between the grinding rollers 12 and enters the grinding area of the grinding disc 11; and the high-temperature superheated steam pipeline 2 is provided with a valve 3; The primary fan 7 transports the hot primary air 5 to the coal mill 12 through the primary air channel 6 .
[0035] In the technical implementation, the coal mill 8 is equipped with three grinding rollers 12, and three high-temperature superheated steam pipes 2 are arranged in the circumferential dire...
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The invention relates to a method and device for improving the output of a coal mill based on a lignite coal pulverizing system. The device for improving the output of the coal mill based on the pulverizing system comprises that a grinding disc is arranged in the coal mill; nozzles are arranged on the periphery of the grinding disc; a grinding roller is arranged at the upper end of the grinding disc; one end of a high-temperature superheated steam pipeline is connected with a steam turbine, the other end of the high-temperature superheated steam pipeline penetrates through the cylinder wall ofthe coal mill, and then the other end of the high-temperature superheated steam pipeline is introduced into a grinding area of the grinding disc through a grinding roller gap; a valve is arranged onthe high-temperature superheated steam pipeline; and a primary fan conveys hot primary air into the coal mill through a primary air duct. According to the method and the device, raw coal is instantlyheated by using high-temperature superheated steam, and the temperature of the raw coal can be increased by 10-20 DEG C. Under the premise of ensuring the normal air-powder ratio, the outlet temperature can also be ensured, so that the drying output problem of burning lignite is solved. The combustion efficiency of a boiler is improved, meanwhile, the abrasion of related equipment of the pulverizing system and a pulverized coal pipeline is reduced, and the operation safety of the pulverizing system is improved.
Description
technical field [0001] The invention relates to the technical field of a pulverizing system of a thermal power plant, in particular to a method and a device for increasing the output of a coal mill based on a lignite pulverizing system. Background technique [0002] With the reduction of coal market storage and the rise of coal prices, more and more thermal power plant pulverization systems deviate from the designed coal types, especially in the three northeastern provinces where there are abundant lignite reserves. A lot of imported lignite is applied to existing coal mills, and problems such as low efficiency and insufficient grinding output have been encountered. [0003] More and more lignite is used in thermal power pulverizing system, becoming its main coal type or blended coal type. The prominent feature of lignite is high total moisture content, so the unit burning lignite requires a good drying power in the pulverizing system to ensure the outlet temperature of the...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B02C15/00B02C23/32B02C19/18
CPCB02C15/00B02C23/32B02C19/186B02C2015/002
Inventor 武海王晓余冬徐继成付诗萌朱建巍
Owner 北京蓝爱迪电力技术有限公司