JPH09236246A - Clog releasing method for powder conveyer - Google Patents
Clog releasing method for powder conveyerInfo
- Publication number
- JPH09236246A JPH09236246A JP3954596A JP3954596A JPH09236246A JP H09236246 A JPH09236246 A JP H09236246A JP 3954596 A JP3954596 A JP 3954596A JP 3954596 A JP3954596 A JP 3954596A JP H09236246 A JPH09236246 A JP H09236246A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- purge gas
- flow rate
- clogging
- granular material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Landscapes
- Air Transport Of Granular Materials (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、加圧流動床ボイラ
におけるドライフィード方式燃料供給装置など粉粒体を
搬送する装置における詰り解除方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing clogging in a device for conveying powder particles such as a dry feed type fuel supply device in a pressurized fluidized bed boiler.
【０００２】[0002]
【従来の技術】従来の粉粒体搬送装置の例として加圧流
動床ボイラのドライフィード方式燃料供給装置を図４に
示している。図４において、０は加圧流動床炉を示し、
この炉０内には、燃料弁３を具えた燃料供給管５を通し
て燃料ノズル４から燃料が供給される。また、燃料弁３
の下流の燃料供給管５には、ＯＮ−ＯＦＦパージ弁１を
具えたパージＮ2 管６が接続されている。2. Description of the Related Art FIG. 4 shows a dry-feed type fuel supply device for a pressurized fluidized bed boiler as an example of a conventional powder and granular material conveying device. In FIG. 4, 0 indicates a pressurized fluidized bed furnace,
Fuel is supplied from the fuel nozzle 4 into the furnace 0 through a fuel supply pipe 5 having a fuel valve 3. Also, the fuel valve 3
A purge N 2 pipe 6 including an ON-OFF purge valve 1 is connected to the fuel supply pipe 5 downstream of the.
【０００３】このように構成されたドライフィード方式
燃料供給装置において、燃料（粉体）供給管５が閉塞し
た場合、窒素、空気等のガスを送るパージガス管６に設
けられた手動又はエアシリンダ付ＯＮ・ＯＦＦ弁１を瞬
間的に開き、燃料供給管５内を加圧することにより、詰
った粉体を加圧流動床炉（ＰＦＢＣ炉）０の流動層８内
に押し出していた。しかしながら、このような従来のや
り方では燃料供給管５内の粉体を瞬間的に圧密させ、パ
ージ不能となる場合が多かった。In the dry-feed type fuel supply apparatus having the above-mentioned structure, when the fuel (powder) supply pipe 5 is closed, a purge gas pipe 6 for feeding a gas such as nitrogen or air is provided with a manual or air cylinder. The ON / OFF valve 1 is momentarily opened and the inside of the fuel supply pipe 5 is pressurized to push the clogged powder into the fluidized bed 8 of the pressurized fluidized bed furnace (PFBC furnace) 0. However, in such a conventional method, in many cases, the powder in the fuel supply pipe 5 was instantly compacted, and purging became impossible.
【０００４】[0004]
【発明が解決しようとする課題】前述の通り、従来の瞬
間的に配管内を加圧パージする詰り解除方式では、詰っ
ている内部粉体を圧密させ、パージ不能となる場合が多
かった。閉塞解除のためには、輸送不能となった高濃度
状態にある粉体を圧密することなく、逆にほぐすように
する必要がある。As described above, in the conventional clogging release system in which the inside of the pipe is pressurized and purged instantaneously, the clogged internal powder is compacted, and purging often becomes impossible. In order to release the blockage, it is necessary to loosen the powder in a high-concentration state, which cannot be transported, without consolidating it.
【０００５】本発明は、粉粒体を気体搬送する粉粒体搬
送装置における粉粒体搬送系に詰りを生じた場合、その
詰り解除率の高い詰り解除方法を提供することを課題と
している。SUMMARY OF THE INVENTION An object of the present invention is to provide a method for clearing a clogging of a granular material conveying system for conveying a granular material in a gas state, when the granular material conveying system is clogged.
【０００６】[0006]
【課題を解決するための手段】本発明は前記課題を解決
するため、粉粒体を気体搬送する粉粒体搬送装置におけ
る粉粒体搬送系に詰りを生じた場合、その粉粒体搬送系
にパージガスを少量から徐々に増加させて投入する方法
を採用する。In order to solve the above-mentioned problems, the present invention provides a granular material conveying system in which a granular material conveying system in a granular material conveying device for conveying a granular material in a gas state is clogged. A method of gradually increasing the amount of purge gas and introducing it is adopted.
【０００７】このようにパージガスを徐々に増加させて
投入する方法を採用することにより、パージ時の急激な
加圧による配管内粉体の圧密を生じさせないことは勿論
のこと、配管内の粉体を徐々に流動化させ、パージガス
の流路を作り、最終的に詰りを解除させることができ
る。By adopting such a method in which the purge gas is gradually increased and introduced, it is of course possible to prevent the powder in the pipe from being consolidated due to the rapid pressurization during the purge. Can be gradually fluidized to form a flow path for the purge gas, and finally the clogging can be released.
【０００８】このパージガスの流量の増加率や時間は、
取り扱かう粉粒体の性状（比重、粒径、水分etc ）によ
り異るため、個々に応じて設定可能な系を用いるのが好
ましい。The rate of increase of the flow rate of the purge gas and the time are as follows:
Since it depends on the properties (specific gravity, particle size, water content, etc.) of the powdery or granular material to be handled, it is preferable to use a system that can be set individually.
【０００９】[0009]
【発明の実施の形態】以下、本発明による粉粒体搬送装
置における詰り解除方法について図１に示した実施の形
態に基づいて具体的に説明する。なお、以下の実施の形
態も、加圧流動床ボイラの燃料供給管や燃料ノズルに詰
りを生じたときに本発明による詰り解除方法を適用した
場合であって、図４に示した従来の装置と同じ構成の部
分には説明を簡単にするため同じ符号を付してある。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method for clearing a clogging in a powdery or granular material conveying device according to the present invention will be specifically described based on the embodiment shown in FIG. Note that the following embodiments are also cases in which the clogging releasing method according to the present invention is applied when clogging occurs in the fuel supply pipe or the fuel nozzle of the pressurized fluidized bed boiler, and the conventional apparatus shown in FIG. The same reference numerals are given to parts having the same configurations as those in order to simplify the description.
【００１０】図１に示すように、加圧流動床炉０には、
下部の流動層８内に配設された燃料ノズル４に燃料供給
管５が接続されている。燃料供給管５には燃料弁３が取
付けられている。燃料供給管５の燃料弁３の近く、加圧
流動床炉０側にはパージＮ2管６が接続されている。As shown in FIG. 1, the pressurized fluidized bed furnace 0 includes
A fuel supply pipe 5 is connected to a fuel nozzle 4 arranged in a lower fluidized bed 8. A fuel valve 3 is attached to the fuel supply pipe 5. A purge N 2 pipe 6 is connected to the pressurized fluidized bed furnace 0 side of the fuel supply pipe 5 near the fuel valve 3.
【００１１】パージＮ2 管６には流量制御弁２と流量計
９が設けられ、流量制御弁２と流量計９は制御装置７と
連結されている。この流量制御装置７には、パージガス
の流量を、パージ開始時は燃料（粉体）の流動化が開始
する速度となる程度の規定流量に保持し、規定時間後徐
々にパージガス流量を増加させるようにしたシステムを
組み込まれている。The purge N 2 pipe 6 is provided with a flow control valve 2 and a flow meter 9, and the flow control valve 2 and the flow meter 9 are connected to a controller 7. The flow rate control device 7 holds the flow rate of the purge gas at a specified flow rate at which the fluidization of the fuel (powder) starts at the start of the purge, and gradually increases the flow rate of the purge gas after a specified time. It has a built in system.
【００１２】制御装置７には流量計９の流量信号を送
り、予じめ設定されたパージガス量Ｑ及びパージ時間ｔ
となっているかをフィードバックしながら、流量制御弁
２の開度を調節する。A flow rate signal from a flow meter 9 is sent to the control device 7, and a preset purge gas amount Q and a purge time t are set.
The opening degree of the flow rate control valve 2 is adjusted while feeding back whether or not.
【００１３】この制御プログラムの一例は図３に示す通
りであり、パージ開始時の０からｔ 1 の時間に、粉体の
流動化開始速度に相当するパージガス量Ｑ1 に達する迄
供給し、一定時間ｔ2 までそのパージガス量Ｑ1 で供給
後、その後はｔ3 時間までに粉体浮遊速度の３〜５倍に
相当するパージガス量Ｑ2 までパージし、そのガス量Ｑ
2 をｔ4 まで保持した後、ｔ5 までに供給を停止する。An example of this control program is shown in FIG.
And 0 to t at the start of purging 1Of the powder
Purge gas amount Q corresponding to fluidization start speed1Until
Supply for a fixed time tTwoUntil the purge gas amount Q1Supplied by
And then tThree3 to 5 times the powder floating speed by time
Equivalent purge gas amount QTwoUntil the gas amount Q
TwoTFourHold until tFiveSupply will be stopped by.
【００１４】以上のパージ操作に対応した燃料ノズルの
詰り解除状態を図２に示している。図２の（Ｉ）は粉体
が閉塞した初期の状態であって、燃料弁３と流量制御弁
２が全閉のときの状態である。FIG. 2 shows a fuel nozzle clogging release state corresponding to the above purging operation. FIG. 2 (I) shows an initial state in which the powder is blocked, and is a state in which the fuel valve 3 and the flow rate control valve 2 are fully closed.
【００１５】図２の（II）は、パージ時間が図３のｔ1
からｔ2 を経てｔ3 の途中の流量制御弁２が半開のとき
の状態を示すもので、燃料（粉体）が流動化を開始し、
燃料ノズル４内の粉体が流動化されると共に、燃料ノズ
ル４の出口周辺部の流動材もパージガスにてほぐされ
る。図２の（III ）は図３のｔ2 からｔ3 の時間の途中
からｔ4 までの状態を示すもので、流量制御弁２は全開
となり、パージガスが多量に流れ、燃料ノズル４内の粉
体が排出された状態である。2 (II) shows that the purge time is t 1 in FIG.
It shows the state when the flow control valve 2 is half-open in the middle of t 3 from t 2 to t 3 , and the fuel (powder) starts to fluidize,
The powder in the fuel nozzle 4 is fluidized, and the fluid material around the outlet of the fuel nozzle 4 is also loosened by the purge gas. 2 (III) shows the state from the middle of the time from t 2 to t 3 in FIG. 3 to t 4 , in which the flow control valve 2 is fully opened, a large amount of purge gas flows, and the powder in the fuel nozzle 4 The body is discharged.
【００１６】本発明による詰り解除方法におけるパージ
ガス投入のやり方の一例を説明すると、初期パージガス
量は、燃料ノズル内に詰った粉体の流動化開始速度に相
当するパージガス量を数分間投入し、その後徐々に粉体
を吹き飛ばし排出させるために粉体の浮遊速度の３〜５
倍の流速のガス量まで増加し、数１０秒保持するように
する。これによって燃料ノズルに閉塞した粉体の大部分
はパージ可能である。An example of the method of charging the purge gas in the method for clearing clogging according to the present invention will be described. As the initial purge gas amount, a purge gas amount corresponding to the fluidization start speed of the powder clogged in the fuel nozzle is charged for several minutes and then 3 to 5 of the floating speed of the powder in order to gradually blow and discharge the powder
The amount of gas is increased to double the flow rate, and it is maintained for several tens of seconds. As a result, most of the powder clogging the fuel nozzle can be purged.
【００１７】従来の方法によって、閉塞燃料ノズルをパ
ージした場合の詰り解除率は約２０％と低いものであっ
たが、本発明の詰り解除方法によって実施した場合、８
０％以上の詰り解除率を達成した。The clogging removal rate when the blocked fuel nozzle was purged by the conventional method was as low as about 20%, but when it was carried out by the clogging removal method of the present invention, it was 8%.
An unclogging rate of 0% or more was achieved.
【００１８】[0018]
【発明の効果】以上説明したように、本発明による粉粒
体搬送装置における詰り解除方法では、粉粒体搬送系に
詰りを生じた場合、その粉粒体搬送系にパージガスを少
量から徐々に増加させて投入する。As described above, according to the method for clearing clogging in the granular material conveying system according to the present invention, when clogging occurs in the granular material conveying system, a small amount of purge gas is gradually added to the granular material conveying system. Increase and throw in.
【００１９】本発明のこの方法によると、従来のパージ
方法による閉塞燃料ノズルの詰り解除成効率が約２０％
と低いものであったのに対し、詰り解除成効率は８０％
以上に増加した。According to this method of the present invention, the clogging release efficiency of the closed fuel nozzle by the conventional purging method is about 20%.
Although it was low, the clogging release efficiency was 80%.
More than that.
【００２０】搬送される粉体の物性の違いに応じて初期
パージガス流量及び流量増加率を調整することにより、
本発明は各種粉体を気流搬送する装置に適用可能であ
る。By adjusting the initial purge gas flow rate and the flow rate increase rate according to the difference in the physical properties of the powder to be conveyed,
INDUSTRIAL APPLICABILITY The present invention can be applied to an apparatus that conveys various powders by air flow.
【図１】本発明による詰り解除方法を適用する、加圧流
動床ボイラのドライフィード方式燃料供給装置を示す系
統図。FIG. 1 is a system diagram showing a dry-feed type fuel supply apparatus for a pressurized fluidized bed boiler to which a method for removing clogging according to the present invention is applied.
【図２】本発明の方法による詰り解除状態を段階的に示
す説明図。FIG. 2 is an explanatory view showing a step of releasing a clogging by the method of the present invention.
【図３】本発明による詰り解除方法におけるパージガス
量とパージ時間の関係を示す線図。FIG. 3 is a diagram showing a relationship between a purge gas amount and a purge time in the clogging releasing method according to the present invention.
【図４】従来の加圧流動床ボイラにおけるフィード方式
燃料供給装置を示す系統図。FIG. 4 is a system diagram showing a feed type fuel supply device in a conventional pressurized fluidized bed boiler.
０ 加圧流動床炉 ２ 流量制御弁 ３ 燃料弁 ４ 燃料ノズル ５ 燃料供給管 ６ パージＮ2 管 ７ 制御装置 ８ 流動層 ９ 流量計0 pressurized fluidized bed furnace 2 flow control valve 3 fuel valve 4 fuel nozzle 5 fuel supply pipe 6 purge N 2 pipe 7 controller 8 fluidized bed 9 flow meter
Claims (1)
おいて粉粒体搬送系に詰りを生じた場合、同粉粒体搬送
系にパージガスを少量から徐々に増加させて投入するこ
とを特徴とする粉粒体搬送装置における詰り解除方法。1. When a powder or granular material conveying system for conveying a powder or granular material in a gas state is clogged, a purge gas is gradually and gradually added to the powder or granular material conveying system. A method for clearing clogging in a powdery or granular material conveying device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3954596A JPH09236246A (en) | 1996-02-27 | 1996-02-27 | Clog releasing method for powder conveyer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3954596A JPH09236246A (en) | 1996-02-27 | 1996-02-27 | Clog releasing method for powder conveyer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09236246A true JPH09236246A (en) | 1997-09-09 |
Family
ID=12556034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3954596A Withdrawn JPH09236246A (en) | 1996-02-27 | 1996-02-27 | Clog releasing method for powder conveyer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09236246A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007512947A (en) * | 2003-11-24 | 2007-05-24 | ノードソン コーポレーション | Concentrated phase pump for dry particulate materials |
-
1996
- 1996-02-27 JP JP3954596A patent/JPH09236246A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007512947A (en) * | 2003-11-24 | 2007-05-24 | ノードソン コーポレーション | Concentrated phase pump for dry particulate materials |
| US7997878B2 (en) | 2003-11-24 | 2011-08-16 | Nordson Corporation | Dense phase powder pump with single ended flow and purge |
| US8057197B2 (en) | 2003-11-24 | 2011-11-15 | Nordson Corporation | Transparent valve body for dense phase pump |
| JP4827740B2 (en) * | 2003-11-24 | 2011-11-30 | ノードソン コーポレーション | Concentrated phase pump for dry particulate materials |
| US8333570B2 (en) | 2003-11-24 | 2012-12-18 | Nordson Corporation | Dense phase pump for dry particulate material |
| US8678777B2 (en) | 2003-11-24 | 2014-03-25 | Nordson Corporation | Dense phase pump for dry particulate material |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20030506 |