CN103162305A - Combined type coal pulverizing system - Google Patents
Combined type coal pulverizing system Download PDFInfo
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- CN103162305A CN103162305A CN2011104160519A CN201110416051A CN103162305A CN 103162305 A CN103162305 A CN 103162305A CN 2011104160519 A CN2011104160519 A CN 2011104160519A CN 201110416051 A CN201110416051 A CN 201110416051A CN 103162305 A CN103162305 A CN 103162305A
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Abstract
The invention discloses a combined type coal pulverizing system. A medium speed coal mill direct blowing type coal pulverizing system and a double-in and double-out coal mill direct blowing type coal pulverizing system are in parallel connection with a furnace and a combustor. The furnace is connected with an air feeder, a primary air fan, and a seal fan, and the seal fan is simultaneously connected with the medium speed coal mill direct blowing type coal pulverizing system and the double-in and double-out coal mill direct blowing type coal pulverizing system. The combined type coal pulverizing system selectively delivers coals to a medium speed coal mill or a double-in and double-out coal mill through a coal feeder according to the different coal qualities of coals. If the coals are better in the coal qualities, the coals are delivered to the medium speed coal mill as far as possible, so that a lower coal pulverizing power consumption is guaranteed, and economical efficiency of power plant operation is guaranteed. If the coals are worse in the coal qualities, the coals are delivered to the double-in and double-out coal mill due to the fact that the coals are not suitable for pulverization in the medium speed coal mill, so that unsafe factors brought by barely running the medium speed coal mill are avoided, and the safety of the power plant operation is guaranteed.
Description
Technical field
The present invention relates to the pulverized coal preparation system in a kind of coal-fired station.
Background technology
Pulverized coal preparation system is important accessory system in coal-fired station, pulverized coal preparation system mainly contains direct-firing and the large class of warehouse formula two, and unit pulverized-coal system is divided into the direct-firing systems such as double-inlet and double-outlet steel ball coal mill, medium-speed pulverizer coal machine, blower mill according to coal pulverizer type difference.
Variety classes according to power plant soot, the pulverized coal preparation system that is most widely used at present is mainly the direct-firing cold primary air fan pulverized coal preparation system of medium-speed pulverizer malleation, as shown in Figure 1, and the direct-firing cold primary air fan pulverized coal preparation system of double-inlet and double-outlet steel ball coal mill malleation, as shown in Figure 2.
The advantage of medium-speed pulverizer is wider to the adaptability of coal, is particularly suitable for grinding the incendive high-volatile coals such as bituminous coal, brown coal, and the coal-grinding power consumption is low, and noise is low; Whole less, lightweight than double inlet and outlet coal mill volume.Shortcoming is more responsive to " three " (wooden unit, stone and iron block) in coal, easily wearing and tearing; And be not suitable for grinding high abrasiveness, high rigidity, high ash content and low-volatile coal.In addition, medium-speed pulverizer can not guarantee thinner fineness of pulverized coal when underload, be unfavorable for coal dust firing and flame stabilization; The cycle of changing after the grinding roller wearing and tearing is relatively short, and the plant maintenance maintenance workload is large.In addition, system generally also need arrange a standby coal pulverizer.
Double-inlet and double-outlet steel ball coal mill is to the coal type change strong adaptability, and coal is not limit, and is particularly suitable for developing abrasion index high, and ash content is high, and fugitive constituent is low, requires the high coal of stove fineness of pulverized coal, has the irreplaceable advantage of medium-speed pulverizer for grinding of mixed coal; Double inlet and outlet coal mill can also bilateral or one-sided operation; Main wear-out part is steel ball, can long-term safety move, and maintenance cost is low, safeguards simple.There is not the problem that causes pulverizer capacity to reduce due to wearing and tearing.Standby mill need be set, also not need to arrange the pebble coal system, auxiliary equipment is few, and system is simple, and operation, maintenance workload are few.The major defect of double inlet and outlet coal mill is that the operation power consumption is high, and floor space is higher than medium-speed pulverizer.
At present the unit pulverized-coal system of coal-fired station all adopts is the simple direct-firing system of medium-speed pulverizer malleation or double-inlet and double-outlet steel ball coal mill malleation direct-firing system.
Power plant for operation, if what adopt is the simple direct-firing system of medium-speed pulverizer malleation, when coal-fired ature of coal belongs to high abrasiveness, high rigidity, high ash content and low-volatile coal, power plant's Operation safety will be subjected to very large the impact, even can't move; If but adopt be the direct-firing system of simple double-inlet and double-outlet steel ball coal mill malleation the time, when coal-fired ature of coal belongs to the coal that is suitable for medium-speed pulverizer, the coal-grinding power consumption exceeds much than medium-speed pulverizer again, the economy that power plant moves is poor again.
Summary of the invention
Purpose of the present invention just is to provide a kind of novel combined pulverized coal preparation system, the comprehensive advantage of medium-speed pulverizer unit pulverized-coal system and double inlet and outlet coal mill unit pulverized-coal system, can either guarantee that the powder process power consumption is less, can keep good coal adaptability again, avoid its shortcoming separately.
For achieving the above object, the present invention is by the following technical solutions:
The medium-speed pulverizer unit pulverized-coal system is connected with boiler, combustor parallel with the double inlet and outlet coal mill unit pulverized-coal system, described boiler connects pressure fan, primary air fan and seal fan, and seal fan connects medium-speed pulverizer unit pulverized-coal system and double inlet and outlet coal mill unit pulverized-coal system simultaneously.
In described medium-speed pulverizer unit pulverized-coal system, medium-speed pulverizer is connected with hot booster fan.
Adopt the present invention of technique scheme, according to the difference of coal-fired ature of coal, optionally fire coal is sent into medium-speed pulverizer or double-inlet and double-outlet steel ball coal mill by feeder; When if coal-fired ature of coal is better, send into medium-speed pulverizer as far as possible, so just can guarantee lower powder process power consumption, thereby guarantee the economy of power plant's operation; If ature of coal is relatively poor, when being not suitable for medium-speed pulverizer and grinding, just send into double-inlet and double-outlet steel ball coal mill, the unsafe factor of so just having avoided inadequate speed coal mill in service to bring, thus guarantee power plant's Operation safety.
Description of drawings
Fig. 1 is the direct-firing cold primary air fan pulverized coal preparation system schematic diagram of medium-speed pulverizer malleation in prior art.
Fig. 2 is the schematic diagram of the direct-firing cold primary air fan pulverized coal preparation system of double-inlet and double-outlet steel ball coal mill malleation in prior art.
Fig. 3 is schematic diagram of the present invention.
The specific embodiment
As shown in Figure 3, medium-speed pulverizer unit pulverized-coal system and double inlet and outlet coal mill unit pulverized-coal system and boiler 1, burner 2 are connected in parallel, namely connect simultaneously medium-speed pulverizer 7 and double-inlet and double-outlet steel ball coal mill 8 from boiler 1 direction feeder 6 out, consist of thus the combined type pulverized coal preparation system.And boiler 1 connects pressure fan 4, primary air fan 5 and seal fan 9, and seal fan 9 connects medium-speed pulverizer unit pulverized-coal system and double inlet and outlet coal mill unit pulverized-coal system simultaneously.
Need to be higher than the problem of double-inlet and double-outlet steel ball coal mill 8 blast for medium-speed pulverizer 7 blast, the present invention is connected with medium-speed pulverizer and solves by hot booster fan 10 is set.
Operation principle of the present invention is: according to the difference of coal-fired ature of coal, optionally fire coal is sent into medium-speed pulverizer or double-inlet and double-outlet steel ball coal mill by feeder; When if coal-fired ature of coal is better, send into medium-speed pulverizer as far as possible, so just can guarantee lower powder process power consumption, thereby guarantee the economy of power plant's operation; If ature of coal is relatively poor, when being not suitable for medium-speed pulverizer and grinding, just send into double-inlet and double-outlet steel ball coal mill, the unsafe factor of so just having avoided inadequate speed coal mill in service to bring, thus guarantee power plant's Operation safety.
Claims (2)
1. combined type pulverized coal preparation system, it is characterized in that: medium-speed pulverizer unit pulverized-coal system and double inlet and outlet coal mill unit pulverized-coal system and boiler (1), burner (2) are connected in parallel, described boiler (1) connects pressure fan (4), primary air fan (5) and seal fan (9), and seal fan (9) connects medium-speed pulverizer unit pulverized-coal system and double inlet and outlet coal mill unit pulverized-coal system simultaneously.
2. combined type pulverized coal preparation system according to claim 1, it is characterized in that: in described medium-speed pulverizer unit pulverized-coal system, medium-speed pulverizer (7) is connected with hot booster fan (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011104160519A CN103162305A (en) | 2011-12-14 | 2011-12-14 | Combined type coal pulverizing system |
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| CN2011104160519A CN103162305A (en) | 2011-12-14 | 2011-12-14 | Combined type coal pulverizing system |
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| CN103162305A true CN103162305A (en) | 2013-06-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104180384A (en) * | 2014-08-14 | 2014-12-03 | 西安西热锅炉环保工程有限公司 | System and method of blending combustion of coal type with low ash melting point in coal-fired utility boiler |
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| JPH05288335A (en) * | 1992-04-06 | 1993-11-02 | Babcock Hitachi Kk | Device and method for milling coal for boiler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104180384A (en) * | 2014-08-14 | 2014-12-03 | 西安西热锅炉环保工程有限公司 | System and method of blending combustion of coal type with low ash melting point in coal-fired utility boiler |
| CN104180384B (en) * | 2014-08-14 | 2016-08-24 | 西安西热锅炉环保工程有限公司 | Coal-fired power station boiler mixes the System and method for burning low ash smelting point coal |
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Application publication date: 20130619 |