CN102865588A - Middle warehouse type powder making system with low temperature smoke as drying agent and nitrogen as isolation layer - Google Patents
Middle warehouse type powder making system with low temperature smoke as drying agent and nitrogen as isolation layer Download PDFInfo
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- CN102865588A CN102865588A CN 201210404559 CN201210404559A CN102865588A CN 102865588 A CN102865588 A CN 102865588A CN 201210404559 CN201210404559 CN 201210404559 CN 201210404559 A CN201210404559 A CN 201210404559A CN 102865588 A CN102865588 A CN 102865588A
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Abstract
The invention provides a middle warehouse type powder making system with low temperature smoke as a drying agent and nitrogen as an isolation layer. The system comprises a draught fan, a coal grinding machine and a powder warehouse and further comprises a low temperature furnace smoke recycling pipeline, a nitrogen producing device and a powder warehouse nitrogen filling pipeline. The low temperature furnace smoke recycling pipeline is connected between an outlet pipeline of the draught fan and an inlet air pipeline of the coal grinding machine, and an adjusting door and a stopping door are arranged on the low temperature furnace smoke recycling pipeline. The nitrogen producing device is connected with the powder warehouse through the warehouse nitrogen filling pipeline to fill nitrogen in the powder warehouse to form the isolation layer on the surface of coal powder. The system is safe due to the fact that content of combustible gas in the powder making system is not increased. Preferably, a nitrogen filling system is arranged in the powder warehouse, and air in the warehouse can be replaced to prevent that the coal powder is combusted spontaneously and explodes in the powder warehouse.
Description
Technical field
The present invention relates to a kind of bin storage type pulverizing system, relating in particular to low-temperature flue gas is that drier and nitrogen are the bin storage type pulverizing system of separation layer.
Background technology
For the thermal power plant of adopting bin storage type pulverizing system, may often face explosion of Coal Pulverizing System, Pulverized Coal Bin powder temperature is high and the danger such as blast, particularly fugitive constituent Vdaf is greater than 25% coal, the possibility of pulverized coal preparation system generation spontaneous combustion blast is larger, Xinjiang Guang Hui coal for example, Xinjiang Guang Hui coal belongs to a kind of of aforementioned particulate dust, and it belongs to brown coal, dust content is large, is the coal that Chinese Guanghui Stocks Trading Co. limited energy company produces in the Xinjiang, China area.In order to prevent the pulverized coal preparation system Fire explosion, each Thermal Power Enterprises has all been taked various measures, but effect is unsatisfactory.At present, the Thermal Power Enterprises Adopts measure mainly adopts the principle that reduces oxygen content in the pulverized coal preparation system drier, and its core is the entrance that the weary gas of mill exhauster outlet is caused coal pulverizer, replaces the hot air drying drying prescription, reduce the oxygen content of pulverized coal preparation system drier, thereby prevent spontaneous combustion and blast.But there is multinomial shortcoming in this type of scheme, and for example, the temperature that mill exhauster exports weary gas lowers, and can not all replace the hot air drying drying prescription, and needing increases hot blast, so oxygen content is still higher in the drier.Mill exhauster exports and contains a large amount of fuel gas in the weary gas, causes the content of fuel gas in the pulverized coal preparation system to increase, and the possibility of pulverized coal preparation system spontaneous combustion blast increases.Itself just contains aerobic in the weary gas, and therefore the introducing of weary gas can not change the oxygen content of drier, is not very large to preventing pulverized coal preparation system spontaneous combustion detonation.
Summary of the invention
The object of the present invention is to provide a kind of low-temperature flue gas that adopts is that drier and nitrogen are the bin storage type pulverizing system of separation layer, and the weary gas of mill exhauster that exists with the solution prior art can't replace hot air drying drying prescription and inflammable and explosive problem fully.
In order to address the above problem, the invention provides a kind of low-temperature flue gas that adopts is that drier and nitrogen are the bin storage type pulverizing system of separation layer, it comprises air-introduced machine, coal pulverizer, powder storehouse, wherein, also comprise low-temperature furnace smoke recirculation conduit, nitrogen device processed, powder Cang Chongdanguandao, described low-temperature furnace smoke recirculation conduit is connected between the entrance wind pipeline of the outlet conduit of described air-introduced machine and described coal pulverizer, is equipped with on the described low-temperature furnace smoke recirculation conduit to adjust door and pipe valve; Described nitrogen device processed is connected with described powder storehouse by described powder Cang Chongdanguandao, to be filled with nitrogen to described powder storehouse and to form separation layer on the coal dust surface.
According to the above-mentioned low-temperature flue gas that utilizes as a kind of preferred embodiment of drier nitrogen as the bin storage type pulverizing system of separation layer, wherein, the connected node of the entrance wind pipeline of described low-temperature furnace smoke recirculation conduit and described coal pulverizer is positioned at after the entrance hot blast pitch of described coal pulverizer.
As drier and the nitrogen a kind of preferred embodiment as the bin storage type pulverizing system of separation layer, wherein, described nitrogen device processed is located at the top in described powder storehouse according to the above-mentioned low-temperature flue gas that utilizes.
The present invention adopts the principle that reduces oxygen content in the pulverized coal preparation system drier, utilizes low-temperature flue gas as the pulverized coal preparation system drier, and the content of oxygen is lower in the drier, does not have fuel gas, can not increase the content of pulverized coal preparation system fuel gas, and is safer.Further preferably, the powder storehouse arranges Nitrogen filling system, can replace the air in the powder delivery storehouse, prevents that coal dust from exploding in the spontaneous combustion of powder storehouse.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the theory structure schematic diagram of the embodiment of the invention.
The specific embodiment
Below in conjunction with accompanying drawing of the present invention, technical scheme of the present invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
As shown in Figure 1, the embodiment of the invention comprises two groups of pulverized coal preparation systems, wherein one group comprises chimney 1, air-introduced machine 21, electric dust collector 22, muffler 23, pressure fan 24, air preheater 3, rear cigarette well 4, secondary air box 5, low-temperature furnace smoke recirculation pipe 6, the adjustment door 61 and the pipe valve 62 that are used for low-temperature furnace smoke recirculation, cold wind pipe valve 71, cold wind pitch 72, entrance hot blast pitch 73, coal pulverizer 8, coal spout 81, pulverized-coal collector 82, powder storehouse 83, moisture absorption pipe 84, mill exhauster 85, nitrogen device 9 processed, nitrogen blanketing valve road, powder storehouse 91, the annexation between each parts as shown in the figure.Wherein, low-temperature furnace smoke recirculation conduit 6 is connected between the entrance wind pipeline of the outlet conduit of air-introduced machine 21 and coal pulverizer 8, adjusts door 61 and pipe valve 62 and is installed on the low-temperature furnace smoke recirculation conduit 6.
In order further to improve the security of the present embodiment, the present embodiment also comprises nitrogen device 9 processed, and nitrogen device 9 processed is connected with powder storehouse 83 by nitrogen blanketing valve road, powder storehouse 91, to be filled with nitrogen to powder storehouse 83 and to form separation layer on the coal dust surface.Preferably, nitrogen device 9 processed is located at the top in powder storehouse 83, can conserve space.
Preferably, the connected node of the entrance wind pipeline of low-temperature furnace smoke recirculation conduit 6 and coal pulverizer 6 is after the entrance hot blast pitch 73 of coal pulverizer 8.
During application, at first open low-temperature furnace smoke recirculation and adjust door 61, next opens low-temperature furnace smoke recirculation pipe valve 62, coal pulverizer 8 is warmed up tank, when reaching coal pulverizer 8 entry condition, start coal pulverizer 8 and carry out powder process, according to exerting oneself and outlet temperature of coal pulverizer 8, in time adjust the aperture of the entrance hot blast pitch 73 of coal pulverizer 8, guarantee that the outlet temperature of coal pulverizer 8 is in the scope that rules allow.The nitrogen device 9 processed in powder storehouse 83 requires operation in 24 hours, and uninterruptedly the 83 additional nitrogen to the powder storehouse are guaranteed to form separation layer on the surface of coal dust.
This preferred embodiment is preferably used Xinjiang Guang Hui coal when using, Xinjiang Guang Hui coal belongs to a kind of of aforementioned particulate dust, and it belongs to brown coal, and dust content is large, is that China extensively compiles the coal that (company) produces in the Xinjiang, China area.
To sum up, the present invention guides to the coal pulverizer inlet pipeline with the low-temperature flue gas of air-introduced machine outlet, substitutes cold wind, because almost oxygen-free in the flue gas, temperature is high and do not have fuel gas, therefore can be good at reaching the purpose that prevents pulverized coal preparation system spontaneous combustion blast, can also improve the drying capacity of coal pulverizer.One cover nitrogen device processed is installed at top, powder storehouse simultaneously is filled with nitrogen to the powder storehouse continuously, make nitrogen form separation layer on the coal dust surface, can prevent spontaneous combustion of pulverized coal.As from the foregoing, the present invention has multiple advantages, and for example, system is simple; The content of oxygen is lower in the drier; Do not have fuel gas in the drier, can not increase the content of pulverized coal preparation system fuel gas, safer; There is Nitrogen filling system in the powder storehouse, can replace the air in the powder delivery storehouse, prevents that coal dust from exploding in the spontaneous combustion of powder storehouse.
The above; be the specific embodiment of the present invention only, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (3)
1. a low-temperature flue gas is that drier and nitrogen are the bin storage type pulverizing system of separation layer, comprise air-introduced machine, coal pulverizer, powder storehouse, it is characterized in that, also comprise low-temperature furnace smoke recirculation conduit, nitrogen device processed, powder Cang Chongdanguandao, described low-temperature furnace smoke recirculation conduit is connected between the entrance wind pipeline of the outlet conduit of described air-introduced machine and described coal pulverizer, is equipped with on the described low-temperature furnace smoke recirculation conduit to adjust door and pipe valve;
Described nitrogen device processed is connected with described powder storehouse by described powder Cang Chongdanguandao, to be filled with nitrogen to described powder storehouse and to form separation layer on the coal dust surface.
2. low-temperature flue gas according to claim 1 is that drier and nitrogen are the bin storage type pulverizing system of separation layer, it is characterized in that, the connected node of the entrance wind pipeline of described low-temperature furnace smoke recirculation conduit and described coal pulverizer is positioned at after the entrance hot blast pitch of described coal pulverizer.
3. low-temperature flue gas according to claim 1 is that drier and nitrogen are the bin storage type pulverizing system of separation layer, it is characterized in that, described nitrogen device processed is located at the top in described powder storehouse.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210404559 CN102865588A (en) | 2012-10-22 | 2012-10-22 | Middle warehouse type powder making system with low temperature smoke as drying agent and nitrogen as isolation layer |
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| CN 201210404559 CN102865588A (en) | 2012-10-22 | 2012-10-22 | Middle warehouse type powder making system with low temperature smoke as drying agent and nitrogen as isolation layer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103206717A (en) * | 2013-04-24 | 2013-07-17 | 黑龙江省华能电力技术有限公司 | Intermediate-speed powder milling system capable of drying lignite by using cold and hot smoke |
| CN103920260A (en) * | 2014-04-16 | 2014-07-16 | 西安西热锅炉环保工程有限公司 | System and method for preventing spontaneous combustion by oxidization of raw coal in spherical bunker by drawing low-temperature flue gas into bunker for inerting |
| CN109210563A (en) * | 2018-09-04 | 2019-01-15 | 华电电力科学研究院有限公司 | A kind of new device and its working method explosion-proof for the ball type pulverizer system pulverized coal bin |
| CN111750373A (en) * | 2020-08-07 | 2020-10-09 | 西安热工研究院有限公司 | Flue gas recirculation system for preventing accumulated powder of coal powder pipeline of medium-speed coal mill from spontaneous combustion |
-
2012
- 2012-10-22 CN CN 201210404559 patent/CN102865588A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103206717A (en) * | 2013-04-24 | 2013-07-17 | 黑龙江省华能电力技术有限公司 | Intermediate-speed powder milling system capable of drying lignite by using cold and hot smoke |
| CN103206717B (en) * | 2013-04-24 | 2015-09-09 | 黑龙江省华能电力技术有限公司 | Cold and hot flue gas drying brown coal medium-speed milling pulverization system |
| CN103920260A (en) * | 2014-04-16 | 2014-07-16 | 西安西热锅炉环保工程有限公司 | System and method for preventing spontaneous combustion by oxidization of raw coal in spherical bunker by drawing low-temperature flue gas into bunker for inerting |
| CN103920260B (en) * | 2014-04-16 | 2016-04-27 | 西安西热锅炉环保工程有限公司 | Low-temperature furnace smoke sucking inerting ball-type coal bunker anti-raw coal oxidation and spontaneous combustion system and method |
| CN109210563A (en) * | 2018-09-04 | 2019-01-15 | 华电电力科学研究院有限公司 | A kind of new device and its working method explosion-proof for the ball type pulverizer system pulverized coal bin |
| CN111750373A (en) * | 2020-08-07 | 2020-10-09 | 西安热工研究院有限公司 | Flue gas recirculation system for preventing accumulated powder of coal powder pipeline of medium-speed coal mill from spontaneous combustion |
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Application publication date: 20130109 |