阅读说明：本技术 一种锅炉富氧燃烧结合机组协调控制的调峰调频系统和方法 (A kind of peak-frequency regulation system and method for boiler oxygen-enriched combusting combination unit coordinated control ) 是由 郭友瑞 杨豫森 崔华 陈辉 于 2019-09-06 设计创作，主要内容包括：本发明公开了一种锅炉富氧燃烧结合机组协调控制的调峰调频系统和方法,包括机组协调控制模块；锅炉富氧燃烧模块,根据机组协调控制模块下达锅炉增减负荷操作指令通过投入或者切除富氧燃烧稳然装置调节机组负荷。此系统不但可增强锅炉本身的减负荷能力,可以使得机组一年四季可以随时进行深度调峰调频操作,从而极大地增加火电机组的灵活性,广泛适用于热电联产机组或纯凝机组。(The invention discloses a kind of peak-frequency regulation system and method for boiler oxygen-enriched combusting combination unit coordinated control, including unit cooperative control module；Boiler oxygen-enriched combusting module, assigning boiler increasing and decreasing load operational order according to unit cooperative control module, surely right device adjusts unit load by putting into or cutting off oxygen-enriched combusting.This system can not only enhance the load shedding ability of boiler itself, can make unit that can carry out depth peak-frequency regulation operation at any time throughout the year, to greatly increase the flexibility of fired power generating unit, be widely used in cogeneration units or pure condensate unit.)

1. a kind of peak-frequency regulation system and method for boiler oxygen-enriched combusting combination unit coordinated control, which is characterized in that unit association Regulating and controlling peak-frequency regulation system processed includes unit cooperative control module 4 and oxygen-enriched combusting smooth combustion apparatus 7, and the unit cooperative controls mould Block 4 includes boiler coordinating control module, steam turbine coordinating control module and oxygen-enriched combusting control module, the boiler coordinated control mould Block includes boiler dry and wet state shift control module, boiler coal-water ratio optimal control module, boiler combustion optimization control module, described Steam turbine coordinating control module includes steam turbine load control system, primary frequency modulation control, hp and lp bypass control module, main hot vapour again Warm Steam Pressure Control of Circulated module, steam turbine steam extraction control and switching module, auxiliary steam switching control module or small steam turbine vapour source switch mould Block；The unit cooperative control peak-frequency regulation system integration is in fired power generating unit centralized-control cabinet, with unit CCS and AGC Control system and boiler, steam turbine, generator, the various operating parameter sensors of oxygen-enriched combusting equipment and controller carry out communication link It connects.The unit cooperative control module can make unit have broader load regulation range, and rate of load condensate lower limit is from original 45% It directly controls to 15%；And there is faster Changing load-acceleration, higher Load Regulation precision and better primary frequency modulation performance.

Boiler oxygen-enriched combusting module, including oxygen-enriched combusting smooth combustion apparatus, connect with unit cooperative control module, for according to unit Coordinating control module assigns increasing and decreasing load operational order, and by control oxygen-enriched combusting, surely right device adjusts unit load.

2. system according to claim 1, which is characterized in that the unit cooperative control peak-frequency regulation system is according to thermoelectricity When the increase and decrease electricity volume load instruction that the received grid dispatching center of unit is assigned, by controlling the boiler coordinated control mould Block, steam turbine coordinating control module and boiler oxygen-enriched combusting control module, adjust unit load jointly, reach unit increasing and decreasing load Purpose.

3. fired power generating unit coordinated control peak-frequency regulation system according to claim 1, which is characterized in that the unit cooperative The boiler coordinating control module and steam turbine coordinating control module for controlling peak-frequency regulation system pass through control boiler and the various fortune of steam turbine Row parameter can be realized the dynamic change of boiler load factor from 100% to 15%.

4. system according to claim 1, it is characterised in that: the boiler dry and wet state shift control module includes carbonated drink point From device or drum temperature, pressure monitoring control unit, main reheated steam pressure and temp monitoring control unit, boiler steam turbine wall temperature, Boiler steam turbine thermal stress monitors control unit.

5. system according to claim 1, it is characterised in that: the boiler coal-water ratio optimal control module uses coal-water ratio Static state cooperation model, coal-water ratio dynamic fit model, coal-water ratio time difference cooperation model, coal-water ratio wall temperature and thermal stress mating die Type and coal-water ratio comprehensive adjustment cooperation model etc. any one or combination.

6. system according to claim 1, it is characterised in that: the boiler combustion optimization control module includes coal calorific value Calculation and check unit, coal amount Intelligent Feed-forward unit, fuel control unit, Boiler pressure control unit, furnace pressure unit, main steam pressure Power control unit.

7. system according to claim 2, it is characterised in that: according to power grid to power plant response the peak-frequency regulation time, amplitude, The requirement of depth, when unit load rate is greater than 30%, coordinates control when unit cooperative control module assigns increasing and decreasing load instruction System processed adjusts unit load, and when unit load rate is less than 30%, boiler oxygen-enriched combusting control module investment puts into combustion-supporting combustion Material (oil or natural gas) and oxygen, it is ensured that unit surely fires, and further decreases unit output.

8. any system according to claim 1, which is characterized in that surely right device includes oxygen to the oxygen-enriched combusting With fuel delivery means, oxygen-enriched burner, automatic control system, the fuel in the oxygen and fuel delivery means be fuel oil, Any one in combustion gas, coal dust.

9. boiler oxygen-enriched combusting combination unit coordinated control peak-frequency regulation equipment according to claim 1, which is characterized in that The peak-frequency regulation equipment includes hardware components and software section, wherein the hardware components include industrial control host or single-chip microcontroller, Communication module and power module, oxygen-enriched combusting equipment, the industrial control host or single-chip microcontroller include CPU, memory and controller, institute Stating communication module includes all kinds of Communication Cards, the communication interface with DCS；The software section include operating system, configuration software, System application composition.

10. such as the optimal control method of any one system in claim 1 to 8, which is characterized in that the optimal control method Using appointing in the control technologies such as nonlinear model control, PREDICTIVE CONTROL, ANN Control, self adaptive control, fuzzy control It anticipates a kind of or combines, be applied to the optimal control of fired power generating unit, realize the depth peak regulation of unit.

11. optimal control method as claimed in claim 10, which is characterized in that the optimal control method includes following step It is rapid:

The fired power generating unit coordinated control peak-frequency regulation system from unit centralized control system and setting boiler, steam turbine, generator and The various sensor collection associated parameter datas of oxygen-enriched combusting equipment, including mains frequency, AGC instruction, load instruction, unit reality Send out power, each layer coal-supplying amount of boiler-burner, feedwater flow, spray flow at different levels, main reheating steam flow amount, main reheat steam pressure, Main reheat steam temperature；

According to subsequent period unit generation power and AGC load instruction, boiler dry and wet state shift control module, boiler combustion are utilized Optimal control module, boiler coal-water ratio optimal control module, oxygen-enriched combusting control module, control unit boiler Load Regulation to mesh Scale value, and then realize that unit generation power meets the requirement of AGC load instruction；

Unit is dry-hygrometric state handoff procedure (unit load down) includes, the main vapour pressure decline control of Stream temperature, fuel quantity reduce control, Carry out when necessary feed pump double pump arrive the switching of single pump operation, open when necessary feed water by-pass run, drum or separator temperature water Position control；

The wet-dry state handoff procedure of unit (unit load up) includes, the main vapour pressure of Stream temperature rises control, fuel quantity increases control, Switching that feed pump list pump run to double pump is carried out when necessary, opens main feed line pass feed water by-pass, drum or separation when necessary The control of device water level of temperature；

During unit load reduces, SCR inlet flue-gas temperature is monitored, by investment flue gas recirculation, economizer Any one in road, top layer burner, No. zero high-pressure heater, water supply recirculating line or flue heating device guarantees SCR Entrance flue gas temperature is not less than 310 DEG C；

During boiler load reduces, coal pulverizer underload optimization system is put into when necessary, boiler oxygen-enriched combusting surely fires system, pot Steady any one in combustion system of furnace small oil gun or plasma, guarantees that boiler load factor stablizes burning when being lower than 30%；Prison Boiler water wall and fizzy mineral water pipeline wall temperature are surveyed, avoids thermal stress exceeded；

During steam turbine load reduction, the switching of heat supply steam extraction vapour source, the switching of extraction steam for factories vapour source, small steam turbine vapour source are carried out when necessary Any one handover operation in switching, the switching of hot press vapour source, axle envelope and auxiliary steam source switching；It is high, medium and low to monitor steam turbine Cylinder pressure wall temperature and thermal stress variation, avoid thermal stress exceeded.

12. a kind of peak-frequency regulation system and method for boiler oxygen-enriched combusting combination unit coordinated control, which is characterized in that be applied to The peak-frequency regulation system of the described in any item boiler oxygen-enriched combusting combination unit coordinated controls of claim 1 to 11；The system Middle peak-frequency regulation load down method includes:

S1, dispatching of power netwoks assign the workload demand data to power plant, and the comparison of power plant's central station of floating dock peak regulation module generates electricity in real time and power grid Demand load amount.

S2, determine to need load shedding in next step, if unit does not need to reduce generation load, unit maintains current loads；If Unit needs to reduce generation load, and unit carries out load shedding operation, and boiler coordinating control module, steam turbine coordinating control module are common Adjustment realizes the optimal control of boiler coal-water ratio, boiler combustion optimization control etc. mainly by AGC function respectively.

If S3, unit load continue to decline, when unit load rate is at the section (30%-40%), boiler carries out dry state automatically and turns Hygrometric state conversion.

S4, when unit load down reaches boiler design underload lower limit value (unit load rate < 30%), coordinated control system with It is instructed with AGC, puts into Steady Burning Technique of Low Load measure, oxygen-enriched combustion technology boiler coordinating control module, steam turbine coordinate control at this time Molding block and boiler oxygen-enriched combusting control module collective effect.

S5, continue to lower boiler load by Steady Burning Technique of Low Load, be finally reached boiler low load stable combustion lower limit value, this opportunity Group maintains current loads.

13. a kind of peak-frequency regulation system and method for boiler oxygen-enriched combusting combination unit coordinated control, which is characterized in that be applied to The peak-frequency regulation system of the described in any item boiler oxygen-enriched combusting combination unit coordinated controls of claim 1 to 11；The system Middle peak-frequency regulation load up method includes:

S1, dispatching of power netwoks assign the workload demand data to power plant, and the comparison of power plant's central station of floating dock peak regulation module generates electricity in real time and power grid Demand load amount.

S2, determine to need to increase load in next step, if unit does not need to increase generation load, unit maintains current loads；If Unit needs to increase generation load (current boiler is in low steady combustion lower limit value), and unit carries out load up operation, and boiler coordinates control Molding block, steam turbine coordinating control module and boiler oxygen-enriched combusting control module collective effect.

S3, unit continue growing generation load, when unit load rate demand is greater than 30%, exits Steady Burning Technique of Low Load and arrange Apply --- oxygen-enriched combustion technology exits boiler oxygen-enriched combusting control module, changes by boiler coordinating control module, steam turbine coordinated control Module collective effect.

S4, the 30%-40% stage is in when unit load rate, boiler carries out hygrometric state automatically and becomes a cadre state conversion.

S5, when boiler complete hygrometric state become a cadre state conversion after, when unit carries out increasing load operation according to AGC instruction again, boiler at this time Coordinating control module, steam turbine coordinating control module adjust jointly, realize the optimal control of boiler coal-water ratio, boiler combustion optimization respectively Control etc..

Technical field

The present invention relates to fired power generating unit depth peak regulation (oxygen-enriched combusting+coordinated control) application technologies, comprising subcritical, super (super) critical pure condensate and thermal power plant unit have faster Changing load-acceleration, higher Load Regulation precision and better primary frequency modulation Performance；Unit has broader load regulation range, and rate of load condensate lower limit is directly controlled from original 45% to 15%.

Background technique

In recent years, the continuous upgrading with country to the attention degree of the green energy resources such as wind-powered electricity generation, photovoltaic, new energy access Increase and power grid abandonment electrical phenomena increasingly increase, for the stable operation of power grid, increase the depth peak modulation capacity of thermal power plant, just at For a kind of new normality.For active response grid requirements, under the premise of ensuring unit operational safety, peak regulation is expanded in line with continuous " depth " and " range ", reduce peak regulation fuel consumption, increase depth peak regulation during automatic input rate, mitigate to the maximum extent The principle of operations staff's labor intensity, guarantee long period safe and stable operation of the fired power generating unit under low ebb load condition are realized Depth peak regulation.

For fired power generating unit super (super-) critical boiler there are two types of the form of operation, (dry) solid-state is exactly that steam pressure is more than critical pressure Water becomes steam disposably by entire boiler circuit afterwards；When there are also be exactly hygrometric state when water in system.It is hygrometric state when opening machine , as the rising of load will be converted to dry state operation, micro- overheat when normal.There is a dry and wet state conversion process in centre, and carbonated drink is mixed It closes object to separate through steam-water separator, as the method for operation of dum boiler, boiler load at this time is generally 25%-35% BMCR, wherein water is squeezed into water-cooling wall through boiler water circulating pump and is heated again by steam-water separator water tank.Fired power generating unit depth peak regulation When, as unit load declines, when reaching switching point, Boiler Operation is also turned experience by dry state-dry and wet state-hygrometric state Change process；After unit load increases, Boiler Operation undergoes reverse procedure.

Oxygen-enriched combustion technology is excellent since ignition temperature is high, flue gas is taken away enthalpy is few, fire behaviour and flame holding are good etc. Point is by favor.Sectional combustion technology, the inside smoke reflux skill for the oxygen-enriched burner combination conventional burners that the invention combines Art, swirl flow combustion technology and flow type pump with injection combustion technology can effectively improve efficiency of combustion and reduce the discharge of burning pollutant.

Summary of the invention

The present invention is based on coordinating by unit cooperative control module, demand electric load data of the foundation power grid to power plant Control system adjusts unit parameter, and assigns steady combustion instruction instruction, peak load regulation frequency modulation width to boiler oxygen-enriched combusting control module Degree increases.When can with least cost realize unit depth peak-frequency regulation using system of the invention, and can achieve any Between carry out power peak regulation frequency modulation effect.

It is of the invention described to achieve the purpose that, using following technical scheme:

A kind of peak-frequency regulation system and method for boiler oxygen-enriched combusting combination unit coordinated control, which is characterized in that unit Coordinated control peak-frequency regulation system includes unit cooperative control module 4 and oxygen-enriched combusting smooth combustion apparatus 7, the unit cooperative control Module 4 includes boiler coordinating control module, steam turbine coordinating control module and oxygen-enriched combusting control module, the boiler coordinated control Module includes boiler dry and wet state shift control module, boiler coal-water ratio optimal control module, boiler combustion optimization control module, institute Stating steam turbine coordinating control module includes steam turbine load control system, primary frequency modulation control, hp and lp bypass control module, main reheating Steam temperature Steam Pressure Control of Circulated module, steam turbine steam extraction control and switching module, auxiliary steam switching control module or the switching of small steam turbine vapour source Module；The unit cooperative control peak-frequency regulation system integration in fired power generating unit centralized-control cabinet, with unit CCS and AGC control system and boiler, steam turbine, generator, the various operating parameter sensors of oxygen-enriched combusting equipment and controller are led to Letter connection.The unit cooperative control module can make unit have broader load regulation range, and rate of load condensate lower limit is from original 45% directly controls to 15%；And there is faster Changing load-acceleration, higher Load Regulation precision and better primary frequency modulation Performance.

Boiler oxygen-enriched combusting module, including oxygen-enriched combusting smooth combustion apparatus, connect with unit cooperative control module, are used for basis Unit cooperative control module assigns increasing and decreasing load operational order, and by control oxygen-enriched combusting, surely right device adjusts unit load.

Further, the unit cooperative control peak-frequency regulation system is assigned according to the received grid dispatching center of fired power generating unit Increase and decrease electricity volume load instruction when, pass through the control boiler coordinating control module, steam turbine coordinating control module and boiler Oxygen-enriched combusting control module, adjusts unit load jointly, achievees the purpose that unit increasing and decreasing load.

Further, the boiler coordinating control module and steam turbine coordinated control mould of the unit cooperative control peak-frequency regulation system Block can be realized the dynamic change of boiler load factor from 100% to 15% by control boiler and the various operating parameters of steam turbine.

Further, the boiler dry and wet state shift control module includes steam-water separator or drum temperature, pressure monitoring control Unit processed, main reheated steam pressure and temp monitoring control unit, boiler steam turbine wall temperature, the monitoring control of boiler steam turbine thermal stress are single Member.

Further, the boiler coal-water ratio optimal control module is matched using coal-water ratio static state cooperation model, coal-water ratio dynamic Molding type, coal-water ratio time difference cooperation model, coal-water ratio wall temperature and thermal stress cooperation model and coal-water ratio comprehensive adjustment mating die Any one or the combination such as type.

Further, the boiler combustion optimization control module includes coal calorific value calculation and check unit, coal amount Intelligent Feed-forward Unit, fuel control unit, Boiler pressure control unit, furnace pressure unit, main steam pressure control unit.

Further, the requirement according to power grid to power plant's response peak-frequency regulation time, amplitude, depth is controlled in unit cooperative When module assigns increasing and decreasing load instruction, when unit load rate is greater than 30%, coordinated control system adjusts unit load, works as unit When rate of load condensate is less than 30%, boiler oxygen-enriched combusting control module investment puts into combustion-supporting fuel (oil or natural gas) and oxygen, it is ensured that Unit surely fires, and further decreases unit output.

Further, surely right device includes oxygen and fuel delivery means, oxygen-enriched burner, automatic control to the oxygen-enriched combusting System processed, the fuel in the oxygen and fuel delivery means are fuel oil, combustion gas, any one in coal dust.

Further, the coordinated control depth peak-frequency regulation equipment includes hardware components and software section, wherein described hard Part part includes industrial control host or single-chip microcontroller, communication module and power module, oxygen-enriched combusting equipment, the industrial control host or monolithic Machine includes CPU, memory and controller, and the communication module includes all kinds of Communication Cards, the communication interface with DCS；It is described soft Part part includes operating system, configuration software, system application composition.

A kind of optimal control method of boiler oxygen-enriched combusting combination unit coordinated control peak-frequency regulation system, feature exist In the optimal control method uses nonlinear model control, PREDICTIVE CONTROL, ANN Control, self adaptive control, Fuzzy Control Any one in the control technologies such as system or combination, are applied to the optimal control of fired power generating unit, realize the depth peak regulation of unit.

Further, the optimal control method includes the following steps:

The system is from unit centralized control system and is arranged in the various biographies of boiler, steam turbine, generator and oxygen-enriched combusting equipment Sensor collects associated parameter data, including hair power, boiler-burner are each in fact for mains frequency, AGC instruction, load instruction, unit Layer coal-supplying amount, feedwater flow, spray flow at different levels, main reheating steam flow amount, main reheat steam pressure, main reheat steam temperature；

According to subsequent period unit generation power and AGC load instruction, boiler dry and wet state shift control module, boiler are utilized Combustion control module, boiler coal-water ratio optimal control module, oxygen-enriched combusting control module control unit boiler Load Regulation To target value, and then realize that unit generation power meets the requirement of AGC load instruction；

Unit is dry-and hygrometric state handoff procedure (unit load down) includes that the main vapour pressure decline control of Stream temperature, fuel quantity reduce control It makes, the switching of progress feed pump double pump to single pump operation when necessary, open feed water by-pass operation, drum or separator temperature when necessary Water level control；

The wet-dry state handoff procedure of unit (unit load up) includes that the main vapour pressure of Stream temperature rises control, fuel quantity increases control System, the switching that progress feed pump list pump is run to double pump when necessary are opened main feed line pass feed water by-pass, drum when necessary or are divided It is controlled from device water level of temperature；

During unit load reduces, SCR inlet flue-gas temperature is monitored, as necessary by investment flue gas recirculation, saves coal Any one in device bypass, top layer burner, No. zero high-pressure heater, water supply recirculating line or flue heating device is protected It demonstrate,proves SCR inlet flue-gas temperature and is not less than 310 DEG C；

During boiler load reduces, coal pulverizer underload optimization system is put into when necessary, boiler oxygen-enriched combusting surely fires and is Steady any one in combustion system of system, boiler small oil gun or plasma, guarantees that boiler load factor stablizes combustion when being lower than 30% It burns；Boiler water wall and fizzy mineral water pipeline wall temperature are monitored, avoids thermal stress exceeded；

During steam turbine load reduction, the switching of heat supply steam extraction vapour source, the switching of extraction steam for factories vapour source, small steam turbine are carried out when necessary Any one handover operation in vapour source switching, the switching of hot press vapour source, axle envelope and auxiliary steam source switching；Monitoring steam turbine height, In, low pressure (LP) cylinder wall temperature and thermal stress variation, avoid thermal stress exceeded.

Further, peak-frequency regulation load down method includes: in the system

S1, dispatching of power netwoks assign the workload demand data to power plant, power plant's central station of floating dock peak regulation module comparison power generation in real time with Power grid demand load amount.

S2, determine to need load shedding in next step, if unit does not need to reduce generation load, unit remains current negative Lotus；If unit needs to reduce generation load, unit carries out load shedding operation, boiler coordinating control module, steam turbine coordinated control mould Block adjusts jointly, mainly by AGC function, realizes the optimal control of boiler coal-water ratio, boiler combustion optimization control etc. respectively.

If S3, unit load continue to decline, when unit load rate is at the section (30%-40%), boiler is done automatically State turns hygrometric state conversion.

S4, when unit load down reaches boiler design underload lower limit value (unit load rate < 30%), coordinated control system System follows AGC to instruct, and puts into Steady Burning Technique of Low Load measure, at this time oxygen-enriched combustion technology boiler coordinating control module, steam turbine association Adjust control module and boiler oxygen-enriched combusting control module collective effect.

S5, continue to lower boiler load by Steady Burning Technique of Low Load, be finally reached boiler low load stable combustion lower limit value, this When unit maintain current loads.

Further, peak-frequency regulation load down method includes: in the system

S1, dispatching of power netwoks assign the workload demand data to power plant, power plant's central station of floating dock peak regulation module comparison power generation in real time with Power grid demand load amount.

S2, determine to need to increase load in next step, if unit does not need to increase generation load, unit remains current negative Lotus；If unit needs to increase generation load (current boiler is in low steady combustion lower limit value), unit carries out load up operation, boiler association Adjust control module, steam turbine coordinating control module and boiler oxygen-enriched combusting control module collective effect.

S3, unit continue growing generation load, when unit load rate demand is greater than 30%, exit Steady Burning Technique of Low Load Measure --- oxygen-enriched combustion technology exits boiler oxygen-enriched combusting control module, changes and coordinates control by boiler coordinating control module, steam turbine Molding block collective effect.

S4, the 30%-40% stage is in when unit load rate, boiler carries out hygrometric state automatically and becomes a cadre state conversion.

S5, when boiler complete hygrometric state become a cadre state conversion after, unit again according to AGC instruction carry out increasing load operation when, at this time Boiler coordinating control module, steam turbine coordinating control module adjust jointly, realize the optimal control of boiler coal-water ratio, boiler combustion respectively Optimal control etc..

The beneficial effect comprise that

Peak-frequency regulation system of the invention, by setting unit cooperative control module and boiler oxygen-enriched combusting module, thus Achieve the effect that depth capacity peak-frequency regulation.Increasing and decreasing load operational order is assigned according to unit cooperative control module, passes through boiler Oxygen-enriched combusting module adjusts the load of unit, accomplishes depth capacity peak-frequency regulation amplitude.This system can not only enhance boiler itself Load shedding ability, and utilize boiler oxygen-enriched combusting control module, can make unit that can carry out depth at any time throughout the year Peak-frequency regulation operation is spent, to greatly increase the flexibility of fired power generating unit, is widely used in cogeneration units or pure condensate machine Group.

Detailed description of the invention

Fig. 1 is a kind of peak-frequency regulation for boiler oxygen-enriched combusting combination unit coordinated control that first embodiment of the invention provides System and method, structural schematic diagram；

Fig. 2 is that first embodiment of the invention provides the structural schematic diagram of unit cooperative control module；

Fig. 3 is the system that a kind of boiler oxygen-enriched combusting that first embodiment of the invention provides combines auxiliary peak-frequency regulation equipment Peak-frequency regulation method flow chart (load down stage)；

Fig. 4 is the system that a kind of boiler oxygen-enriched combusting that first embodiment of the invention provides combines auxiliary peak-frequency regulation equipment Peak-frequency regulation method flow chart (load up stage)；

Appended drawing reference:

1 it is boiler, 2 be steam turbine, 3 be generator, 4 be unit cooperative control module, 5 be condenser, 6 is oxygen-eliminating device, 7 For oxygen-enriched combusting, surely right device, 8 are power grid.

Specific embodiment

In order to make the objectives, technical solutions and advantages of the present invention clearer, With reference to embodiment and join According to attached drawing, the present invention is described in more detail.It should be understood that these descriptions are merely illustrative, and it is not intended to limit this hair Bright range.In addition, in the following description, descriptions of well-known structures and technologies are omitted, to avoid this is unnecessarily obscured The concept of invention.