CN204404211U - A kind of thermal power plant pulverized coal preparation system - Google Patents
A kind of thermal power plant pulverized coal preparation system Download PDFInfo
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- CN204404211U CN204404211U CN201520026118.1U CN201520026118U CN204404211U CN 204404211 U CN204404211 U CN 204404211U CN 201520026118 U CN201520026118 U CN 201520026118U CN 204404211 U CN204404211 U CN 204404211U
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Abstract
The utility model discloses the thermal power plant pulverized coal preparation system after a kind of dilatation, comprise multiple stage coal bunker, multiple stage feeder and multiple stage coal pulverizer, a coal bunker in this multiple stage coal bunker comprises a coal feed point and two coal outlets, this coal feed point is for receiving coal, these two coal outlets give two feeder coal supplies respectively, and these two feeders give two coal pulverizer coal supplies respectively.The pulverized coal preparation system caused due to coal consumption increase after can solving unit dilatation by the utility model needs the problem of dilatation, and invests minimum when not affecting operation and maintenance model.
Description
Technical field
The utility model relates to field of thermal power, is specifically related to the thermal power plant pulverized coal preparation system after a kind of dilatation.
Background technology
Current China is just at design-build first double reheat ultra supercritical Fossil Fueled Power Plant Project, and this technology adopts double reheat newly to configure to the thermal power generation of third generation ultra supercritical, further increases generating efficiency, can be called that three generations adds technology.
Run the present situation that Subcritical Units coal consumption is high, the thermal efficiency is low of long period for China, in conjunction with external front end processor (Topping Turbine) concept, East China institute has researched and developed subcritical fired power generating unit double reheat upgrading update method.Main technical points is: front end processor technology is fully combined with double reheat super-supercritical technique by double reheat upgrading update method, reaches and significantly improves generatine set heat efficiency and the effect only slightly increasing improvement cost.Namely main steam pressure and temperature is improved, heated up through reheating by steam discharge after front end processor acting, this reheated steam enters former Subcritical Units and continues acting, maintain former Asia and organize steam turbine side main auxiliary machine as the occasion requires and mill construction remains unchanged, and increasing unit output, such as 600MW unit upgrades to about 800 ~ 850MW grade unit.
Initial analysis, main vapour, to Subcritical Units, is crossed over supercritical parameter by this technology, reach ultra supercritical parameter, reheated steam parameter remains unchanged, and bulk supply coal consumption, close to the coal consumption level of extra-supercritical unit, realizes utilizing advanced technology significantly to reduce the target of coal consumption, energy-saving and emission-reduction.Such as, after arranging preposition unit, the capacity of unit can from about 600MW dilatation to 800 ~ 850MW, along with the expansion of unit capacity, and unit coal consumption increase about 20 ~ 30%.
Require according to " big-and-middle-sized thermal power plant design specification " GB50660-2011: " for medium-speed pulverizer; when grinding design coal; the coal pulverizer except for subsequent use always calculates 110% of coal-fired consumption when power is not less than boiler maximum continuous rating; grind check coal time, the power that always calculates of whole coal pulverizer should not be less than coal-fired consumption during boiler maximum continuous rating ".
Such as, the unit of the cold primary air fan pressurized direct pulverizing coal system of conventional 600MW seed collecting medium-speed pulverizer, coal pulverizer is according to 6 settings, when wherein using design coal, 5 operations, 1 for subsequent use, and the coal pulverizer except for subsequent use always calculates 110% of coal-fired consumption when power is not less than boiler maximum continuous rating.General 600MW carry out Subcritical Units upgrading intergenerational to ultra supercritical parameter, coal consumption about increases about 20 ~ 30%, the coal pulverizer of former 600MW unit pulverized coal preparation system is capable according to 5 fortune 1 received shipments, still according to above-mentioned operational mode, can not meet the requirement of new pulverized coal preparation system.
In order to meet the requirement of new pulverized coal preparation system, current scheme has three:
(1) improvement project, not equipment coal pulverizer, existing multiple stage coal pulverizer all runs;
(2) whole multiple stage coal pulverizers is all changed, be replaced by the coal pulverizer of large model or be replaced by the coal pulverizer of other form.
(3) coal bunker of a newly-built coal pulverizer and correspondence and feeder.
For scheme (1), such as, for 600MW unit, because coal pulverizer is not transformed, 6 coal pulverizers all run, and the operational reliability of pulverized coal preparation system obviously declines.Coal pulverizer state is difficult to ensure, after transformation, coal pulverizer maintenance is adopted nothing but in two ways, still continue to use existing regular inspection strategy, every platform coal pulverizer overhauls every year and about needs 24 days, annual unit will have 144 days has coal pulverizer to stop labour, adding sporadicly because of defect idle time, total number of days will reach 160 ~ 170 days, the 150MW that exerts oneself is limit to calculate if affect unit height according to every platform coal-grinding unit, according to the dynamics of current two detailed rules and regulations examinations, new unit is as adopted the mill group configuration of " 6+0 ", according to the Time Calculation that the above-mentioned annual mill group estimated is stopped transport, 0.25458 hundred million/year ~ 0.27049 hundred million/year will be reached by the amount of money examined.In very short time, (3 ~ 4 days) change the critical pieces such as Burnisher apparatus, and coal pulverizer cannot adjust to optimum state, and pulverized coal preparation system economy will cause equipment deficiency to increase while declining, and fragmentary idle time will increase.
For scheme (2), such as 600MW unit, coal pulverizer only cost of equipment reaches 600 ~ 7,000,000/platform coal pulverizer, the expense of whole replacing coal pulverizer reaches about 4,000 ten thousand/stoves, simultaneously, the coal pulverizer of new model, existing basis needs transformation with the needs meeting new coal pulverizer, and the investment cost of civil engineering is also larger.
For scheme (3), very large owing to storing coal weight in coal bunker, such as, for 600MW unit, coal storage weight is about about 700t, framework for bunker bay after adopting this kind of scheme affects greatly, and existing bunker bay frame structure, ground can not meet the requirement of newly-increased above-mentioned load.
Utility model content
The purpose of this utility model is the problem that the pulverized coal preparation system caused due to coal consumption increase after solving unit dilatation needs dilatation, and invests minimum when not affecting operation and maintenance model.
For achieving the above object, according to an aspect of the present utility model, provide the thermal power plant pulverized coal preparation system after a kind of dilatation, comprise multiple stage coal bunker, multiple stage feeder and multiple stage coal pulverizer, a coal bunker in described multiple stage coal bunker comprises a coal feed point and two coal outlets, a described coal feed point is for receiving coal, and described two coal outlets give two feeder coal supplies respectively, and described two feeders give two coal pulverizer coal supplies respectively.
Preferably, described two coal outlets are connected with two feeders respectively, and described two feeders give two coal pulverizer coal supplies respectively.
Preferably, the thermal power plant pulverized coal preparation system after described dilatation comprises 6 coal bunkers, 7 feeders and 7 coal pulverizers.
Preferably, between each coal bunker and each feeder and between each feeder and each coal pulverizer, coal gate is provided with.
According to another aspect of the present utility model, provide the thermal power plant pulverized coal preparation system after a kind of dilatation, comprise existing thermal power plant pulverized coal preparation system, described existing thermal power plant pulverized coal preparation system comprises multiple stage raw coal bucket, the former feeder of multiple stage and the former coal pulverizer of multiple stage, every platform raw coal bucket comprises a coal feed point and a coal outlet, a coal bunker in described multiple stage raw coal bucket transform the transformation coal bunker with a coal feed point and two coal outlets as, and the thermal power plant pulverized coal preparation system after described dilatation also comprises a newly-increased feeder and a newly-increased coal pulverizer, a coal outlet in described two coal outlets is given described newly-increased feeder coal supply and is passed through this newly-increased feeder to described newly-increased coal pulverizer coal supply, another coal outlet is given a former feeder coal supply and is passed through this former feeder to a former coal pulverizer coal supply.
Preferably, a coal outlet in described two coal outlets is connected with described newly-increased feeder, and give described newly-increased coal pulverizer coal supply by this newly-increased feeder, another coal outlet is connected with a former feeder and passes through this former feeder to a former coal pulverizer coal supply.
Preferably, described transformation coal bunker, newly-increased feeder and newly-increased coal pulverizer are arranged in the enlarging end of the thermal power plant pulverized coal preparation system after described dilatation.
Preferably, described transformation coal bunker, newly-increased feeder and newly-increased coal pulverizer are arranged in the stiff end of the thermal power plant pulverized coal preparation system after described dilatation.
Preferably, between each coal bunker and each feeder and between each feeder and each coal pulverizer, coal gate is provided with.
The utility model has following advantage:
(1) under the prerequisite that can meet unit operation and maintenance requirement, existing coal pulverizer maintenance model is substantially constant, and the operation function of unit is constant;
(2) existing coal bunker, feeder and whole coal pulverizers remain unchanged substantially, can farthest utilize old equipment, greatly reduce the expense of transformation;
(3) bunker bay load increases few, and existing structural framing can remain unchanged, and greatly reduces construction investment expense.
Accompanying drawing explanation
Fig. 1 is the thermal power plant pulverized coal preparation system schematic diagram after dilatation of the present utility model.
Fig. 2 is the partial schematic diagram of the thermal power plant pulverized coal preparation system after dilatation of the present utility model.
Detailed description of the invention
Below with reference to accompanying drawing, preferred embodiment of the present utility model is described in detail, understands the purpose of this utility model, feature and advantage so that clearer.It should be understood that embodiment shown in the drawings is not the restriction to the utility model scope, and the connotation just in order to technical solutions of the utility model are described.
Terminological interpretation:
Pulverized coal preparation system: in thermal power plant, raw coal is ground into the system meeting burning fineness requirement through coal bunker, feeder and coal pulverizer, capital equipment comprises coal bunker, feeder and coal pulverizer.
Boiler design Coal-fired capacity: the Coal-fired capacity that in the unit interval, boiler consumes.Combustion System Design in calculating usually with the Coal-fired capacity of boiler under maximum continuous rating operating mode and average ambient temperature conditions for benchmark.
Inventor through further investigation, develop a kind of on pulverized coal preparation system basis, existing thermal power plant, carry out the dilatation of dilatation after thermal power plant pulverized coal preparation system.Below for convenience of describing, existing thermal power plant pulverized coal preparation system is called the system before dilatation, each equipment in system before dilatation is called original equipment, such as raw coal bucket refers to the coal bunker in the pulverized coal preparation system of existing thermal power plant, former coal pulverizer refers to the coal pulverizer in the pulverized coal preparation system of existing thermal power plant, and former feeder refers to the feeder in the pulverized coal preparation system of existing thermal power plant.Thermal power plant pulverized coal preparation system after dilatation is called the system after dilatation.
As shown in Figure 1, the system before dilatation comprises multiple stage raw coal bucket 10, the former feeder of multiple stage 13, the former coal pulverizer 14 of multiple stage and belt conveyor 12.System 100 after dilatation comprises multiple stage raw coal bucket 10, the former feeder of multiple stage 13, the former coal pulverizer 14 of multiple stage and belt conveyor 12, also comprises newly-increased coal pulverizer 17, newly-increased feeder 14, and the transformation coal bunker 11 transformed on the basis of a raw coal bucket 10.
Wherein, coal bunker 10 comprises coal feed point 101 and coal outlet 102, and coal feed point 101 is for receiving coal from belt conveyor 12, and coal outlet 102 is connected with feeder 13 and by feeder 13 to coal pulverizer 16 coal supply.
Wherein, transform coal bunker 11 and there are a coal feed point 111 and two coal outlets 112,113.Wherein, coal feed point 111 is for receiving coal from belt 12, and coal outlet 112,113 is connected with feeder 14,15 respectively, and gives coal pulverizer 16,17 coal supply by feeder 14,15.
All be provided with coal gate 18 between coal bunker and feeder and between feeder and coal pulverizer, thus control supply in coal pulverizer from coal bunker coal speed and as coal supply switch.
Wherein, transformation coal bunker 11 is transformed by a raw coal bucket 10, specifically, by being cut off the coal outlet end of a raw coal bucket 10, change the end with two coal outlets, and the end that this is had two coal outlets by the mode passing through welding is connected with the remainder of raw coal bucket 10.
In the present embodiment, for 600MW unit, the system before dilatation comprises 6 raw coal buckets, 6 feeders and 6 coal pulverizers.System 100 after dilatation comprises 5 raw coal buckets, 10,6 coal pulverizers, 16,6 feeders, 13,1 transformation coal bunker, 11,1 newly-increased feeder, 14,1 newly-increased coal pulverizer 17 and belt conveyor 12.But, those skilled in the art will appreciate that the utility model also may be used for the unit of other capacity.
The utility model keeps pulverized coal preparation system original n-1 platform coal bunker, feeder and all n platform coal pulverizer is constant, coal bunker for stiff end or enlarging end is transformed, transform the transformation coal bunker with a coal feed point and two coal outlets as, 2 feeders are configured below two coal outlets, a newly-increased coal pulverizer is arranged in original space for maintenance, retains access path.The final configuration mode forming n coal bunker and join n+1 coal pulverizer, meets the requirement of " big-and-middle-sized thermal power plant design specification " GB50660-2011 and actual motion maintenance.Original most of equipment can reuse, and bunker bay framework load does not increase substantially, less on the impact of structure.There is good economy.
The utility model also relates to a kind of method to existing thermal power plant pulverized coal preparation system (system before hereinafter referred dilatation) extending capacity reformation.
In the present embodiment, for 600MW unit, as shown in Figure 1, the system before dilatation comprises 6 coal bunkers, 6 feeders, 6 coal pulverizers and belt conveyors.Wherein, each coal bunker has and only has a coal feed point and a coal outlet.All coal gate is provided with between each coal bunker and each feeder and between each feeder and each coal pulverizer.Wherein, each coal bunker configures a feeder, and each feeder configures a coal pulverizer, and the coal that belt transmits enters feeder by coal bunker, and then is supplied to coal pulverizer via feeder.Present detailed description this existing thermal power plant pulverized coal preparation system is carried out to the method for extending capacity reformation.The method mainly comprises the following steps:
(1) stiff end of system before dilatation or a raw coal bucket of enlarging end are transformed, be specially and transform this raw coal bucket the transformation coal bunker with a coal feed point and two coal outlets as;
(2) a newly-increased feeder, this feeder is arranged in a below of two coal outlets of transformation coal bunker, at another arranged beneath former feeder of two coal outlets of transformation coal bunker;
(3) a newly-increased coal pulverizer, this newly-increased coal pulverizer is connected with newly-increased feeder, in the coal pulverizer before System Expansion any one be arranged in two coal outlets transforming coal bunker another below former feeder be connected.
This method transform the coal bunker that fixing side or enlarging are held the coal bunker of a coal feed point two coal outlets as, and keep coal storage constant during transformation, coal bunker loads change is little; Below improved coal bunker, configure 2 feeders, a newly-increased coal pulverizer is arranged in original space for maintenance, retains access path simultaneously.After newly increasing a coal pulverizer, the coal outlet of original pulverized coal preparation system increases by 20%, the final configuration mode forming n+1 coal pulverizer, can meet " big-and-middle-sized thermal power plant design specification " GB50660-2011 and unit operation and maintenance requirement.Original most of equipment can reuse, and bunker bay framework load does not increase substantially, less on the impact of structure.The utility model all can utilize existing coal pulverizer, and n-1 coal bunker and feeder remain unchanged, and civil engineering bunker bay framework load is substantially constant, can not consider to reinforce, and investment cost is minimum.
Below described preferred embodiment of the present utility model in detail, but it will be appreciated that, after having read above-mentioned instruction content of the present utility model, those skilled in the art can make various changes or modifications the utility model.These equivalent form of values fall within the application's appended claims limited range equally.
Claims (9)
1. the thermal power plant pulverized coal preparation system after a dilatation, comprise multiple stage coal bunker, multiple stage feeder and multiple stage coal pulverizer, it is characterized in that, a coal bunker in described multiple stage coal bunker comprises a coal feed point and two coal outlets, a described coal feed point is for receiving coal, described two coal outlets give two feeder coal supplies respectively, and described two feeders give two coal pulverizer coal supplies respectively.
2. the thermal power plant pulverized coal preparation system after dilatation according to claim 1, is characterized in that, described two coal outlets are connected with two feeders respectively, and described two feeders give two coal pulverizer coal supplies respectively.
3. the thermal power plant pulverized coal preparation system after dilatation according to claim 1, is characterized in that, the thermal power plant pulverized coal preparation system after described dilatation comprises 6 coal bunkers, 7 feeders and 7 coal pulverizers.
4. the thermal power plant pulverized coal preparation system after dilatation according to claim 1, is characterized in that, between each coal bunker and each feeder and between each feeder and each coal pulverizer, be provided with coal gate.
5. the thermal power plant pulverized coal preparation system after a dilatation, comprise existing thermal power plant pulverized coal preparation system, described existing thermal power plant pulverized coal preparation system comprises multiple stage raw coal bucket, the former feeder of multiple stage and the former coal pulverizer of multiple stage, every platform raw coal bucket comprises a coal feed point and a coal outlet, it is characterized in that, a coal bunker in described multiple stage raw coal bucket transform the transformation coal bunker with a coal feed point and two coal outlets as, and the thermal power plant pulverized coal preparation system after described dilatation also comprises a newly-increased feeder and a newly-increased coal pulverizer, a coal outlet in described two coal outlets is given described newly-increased feeder coal supply and is passed through this newly-increased feeder to described newly-increased coal pulverizer coal supply, another coal outlet is given a former feeder coal supply and is passed through this former feeder to a former coal pulverizer coal supply.
6. the thermal power plant pulverized coal preparation system after dilatation according to claim 5, it is characterized in that, a coal outlet in described two coal outlets is connected with described newly-increased feeder, and give described newly-increased coal pulverizer coal supply by this newly-increased feeder, another coal outlet is connected with a former feeder and passes through this former feeder to a former coal pulverizer coal supply.
7. the thermal power plant pulverized coal preparation system after dilatation according to claim 5, is characterized in that, described transformation coal bunker, newly-increased feeder and newly-increased coal pulverizer are arranged in the enlarging end of the thermal power plant pulverized coal preparation system after described dilatation.
8. the thermal power plant pulverized coal preparation system after dilatation according to claim 5, is characterized in that, described transformation coal bunker, newly-increased feeder and newly-increased coal pulverizer are arranged in the stiff end of the thermal power plant pulverized coal preparation system after described dilatation.
9. the thermal power plant pulverized coal preparation system after dilatation according to claim 5, is characterized in that, between each coal bunker and each feeder and between each feeder and each coal pulverizer, be provided with coal gate.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104566430A (en) * | 2015-01-14 | 2015-04-29 | 中国电力工程顾问集团华东电力设计院有限公司 | Coal pulverizing system of thermal power plant and capacity expansion method thereof |
| CN106979532A (en) * | 2017-03-31 | 2017-07-25 | 高安市成兴实业有限公司 | Direct-fired coal dust supply system |
-
2015
- 2015-01-14 CN CN201520026118.1U patent/CN204404211U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104566430A (en) * | 2015-01-14 | 2015-04-29 | 中国电力工程顾问集团华东电力设计院有限公司 | Coal pulverizing system of thermal power plant and capacity expansion method thereof |
| CN106979532A (en) * | 2017-03-31 | 2017-07-25 | 高安市成兴实业有限公司 | Direct-fired coal dust supply system |
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