JPH026967B2 - - Google Patents
Info
- Publication number
- JPH026967B2 JPH026967B2 JP60093413A JP9341385A JPH026967B2 JP H026967 B2 JPH026967 B2 JP H026967B2 JP 60093413 A JP60093413 A JP 60093413A JP 9341385 A JP9341385 A JP 9341385A JP H026967 B2 JPH026967 B2 JP H026967B2
- Authority
- JP
- Japan
- Prior art keywords
- pulverized coal
- boiler
- feeder
- amount
- fuel supply
- 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.)
- Expired - Lifetime
Links
- 239000003245 coal Substances 0.000 claims description 71
- 239000000446 fuel Substances 0.000 claims description 23
- 238000002485 combustion reaction Methods 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 8
- 238000010304 firing Methods 0.000 claims 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 12
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、微粉炭の供給方法を改善して燃焼効
率を向上したボイラの燃料供給装置に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a fuel supply system for a boiler that improves combustion efficiency by improving a method for supplying pulverized coal.
〔従来の技術〕
従来の微粉炭焚きボイラの燃料供給装置は、第
３図に示す如く、微粉炭を微粉炭サイロ３１の下
部出口に取付けたロータリーバルブ３２によつて
定量供給機３３に供給し、更にボイラ３０の負荷
信号例えば蒸気負荷の圧力計３８や流量計３９の
信号により回転数制御されるモータ３４にて微粉
炭の送給量を制御しながら、微粉炭を燃料管３５
に供給し、この微粉炭と燃料管３５内に吹込まれ
た燃焼用空気とを混合してボイラ３０に送給し、
燃焼させるようになつている。又、定量供給機３
３には微粉炭貯量の高レベルおよび低レベルの検
知スイツチ３６，３７が設けられ、微粉炭量が低
レベルの検知スイツチ３７の位置まで低下する
と、ロータリーバルブ３２が作動して微粉炭サイ
ロ３１より微粉炭が供給され、微粉炭量が高レベ
ルの検知スイツチ３６の位置にまで達すると、ロ
ータリーバルブ３２が停止して微粉炭の供給が止
まるようになつている。なお図中４０は蒸気ドラ
ム、４１は押込み送風機、４２はガスエアヒータ
ー、４３は二次空気管、４４はボイラ制御盤、４
５はロータリーバルブ３２の駆動モータである。[Prior Art] A conventional fuel supply system for a pulverized coal-fired boiler, as shown in FIG. Further, the pulverized coal is transferred to the fuel pipe 35 while controlling the feed amount of pulverized coal by a motor 34 whose rotation speed is controlled by a load signal of the boiler 30, such as a signal from a steam load pressure gauge 38 or a flow meter 39.
This pulverized coal is mixed with combustion air blown into the fuel pipe 35 and sent to the boiler 30,
It is designed to be burned. Also, quantitative feeder 3
3 is provided with detection switches 36 and 37 for detecting a high level and a low level of pulverized coal storage, and when the pulverized coal amount falls to the low level detection switch 37 position, the rotary valve 32 is activated to remove the pulverized coal from the pulverized coal silo 31. When more pulverized coal is supplied and the amount of pulverized coal reaches a high level detection switch 36 position, the rotary valve 32 is stopped and the supply of pulverized coal is stopped. In the figure, 40 is a steam drum, 41 is a forced air blower, 42 is a gas air heater, 43 is a secondary air pipe, 44 is a boiler control panel, 4
5 is a drive motor for the rotary valve 32.
ところで、このような微粉炭焚きボイラの燃料
供給装置においては、定量供給機３３内に貯留さ
れる微粉炭のレベルが絶えず変動する。特にロー
タリーバルブ３２が作動して短時間のうちに大量
の微粉炭が供給されているときは微粉炭の粉体圧
の変動が激しく、この変動によつて定量供給機３
３から燃料管３５に供給される微粉炭量にばらつ
きが生じ、微粉炭の供給が過剰になる場合は未燃
部分が発生して燃焼効率が悪くなり、又微粉炭供
給量の過剰、不足が頻繁に繰返されるので窒素酸
化物発生の変動の度合が大きく、従つて発生量も
多くなるなど、燃焼が不安定になるという問題点
があつた。
By the way, in such a fuel supply system for a pulverized coal-fired boiler, the level of pulverized coal stored in the quantitative feeder 33 constantly fluctuates. Particularly when the rotary valve 32 is operated and a large amount of pulverized coal is supplied in a short period of time, the powder pressure of the pulverized coal fluctuates rapidly, and this fluctuation causes the metering feeder 3
If the amount of pulverized coal supplied from 3 to the fuel pipe 35 varies, and if the pulverized coal is supplied in excess, unburned portions will occur and combustion efficiency will deteriorate, and if the amount of pulverized coal supplied is excessive or insufficient. Since the process is repeated frequently, the degree of fluctuation in the amount of nitrogen oxides generated is large, and therefore the amount of nitrogen oxides generated increases, resulting in unstable combustion.
そこで本発明は上記の問題点を解消するため
に、定量供給機内の微粉炭のレベルを一定に保
ち、ボイラに供給される微粉炭量のばらつきを少
くした燃料供給装置を提供しようとするものであ
る。 Therefore, in order to solve the above-mentioned problems, the present invention aims to provide a fuel supply device that maintains a constant level of pulverized coal in a quantitative feeder and reduces variations in the amount of pulverized coal supplied to a boiler. be.
上記問題点を解決するための本発明は、微粉炭
サイロより定量供給機に供給された微粉炭を燃焼
用空気によりボイラに送給し燃焼させるようにし
た燃料供給装置において、微粉炭サイロと定量供
給機との間に駆動モータを備えたロータリーバル
ブを取付け、前記定量供給機に設けた微粉炭量の
検知器の検知信号により前記ロータリーバルブを
回転制御するようにしたことを特徴とするもので
ある。定量供給機に設けた微粉炭量の検知器の検
知信号としては、定量供給機内に設けた微粉炭の
レベル検知器のレベル信号、又は定量供給機に設
けた重量検知器の重量信号が用いられる。
In order to solve the above-mentioned problems, the present invention provides a fuel supply system in which pulverized coal supplied from a pulverized coal silo to a metering feeder is sent to a boiler using combustion air for combustion. A rotary valve equipped with a drive motor is installed between the feeder and the feeder, and the rotation of the rotary valve is controlled by a detection signal from a pulverized coal amount detector provided in the quantitative feeder. be. As the detection signal of the pulverized coal amount detector installed in the metering feeder, the level signal of the pulverized coal level detector installed in the metering feeder or the weight signal of the weight detector installed in the metering feeder is used. .
斯かる構成の本発明の燃料供給装置は、微粉炭
サイロより定量供給機に供給された微粉炭の定量
供給機内におけるレベル又は重量をレベル検知器
又は重量検知器で検知し、ボイラ負荷の変動に対
応してロータリーバルブの回転を制御し、微粉炭
の供給量を加減することにより、定量供給機内の
微粉炭の量が常に一定に保され、定量供給機への
給炭がゆつくり行われ、粉体圧の変動が小さくな
つて、ボイラに供給される微粉炭量のばらつきが
小さくなる。
The fuel supply device of the present invention having such a configuration uses a level detector or a weight detector to detect the level or weight of pulverized coal supplied from the pulverized coal silo to the metering feeder in the metering feeder, and to detect changes in the boiler load. By correspondingly controlling the rotation of the rotary valve and adjusting the amount of pulverized coal supplied, the amount of pulverized coal in the metering feeder is always kept constant, and coal is fed slowly to the metering feeder. Fluctuations in powder pressure are reduced, and variations in the amount of pulverized coal supplied to the boiler are reduced.
本発明の燃料供給装置の一実施例を第１図のボ
イラのブロツク図に基づいて説明する。図におい
て１は微粉炭焚きのボイラ、２は燃焼室、３は加
熱管、４は蒸気ドラムであり、蒸気ドラム４には
圧力発信器５と、蒸気負荷に接続される配管の途
中に流量発信器６が接続されている。７は微粉炭
サイロであり、その下部の出口には回転数制御可
能な駆動モータ９を備えたロータリーバルブ８が
取付けられ、定量供給機１０に接続されている。
この定量供給機１０の下部には微粉炭の送給を回
転数により制御する定量供給機用モータ１１が取
付けられ、更に燃料管１２に接続されている。こ
の燃料管１２は、ボイラ用押込み送風機１３より
吹込まれガスエアヒータ１４で加熱された燃焼用
空気を、前記定量供給機用モータ１１の吐出部に
吹込んで微粉炭と燃焼用空気とを混合し、ボイラ
１に送給して燃焼させるようになつている。なお
１５は二次空気管である。１６はボイラ制御盤で
あり、ボイラ１の圧力発信器５および流量発信器
６より蒸気の圧力信号および流量信号を受信して
定量供給機用モータ１１を回転数制御し、又定量
供給機１０側面の所定の高さに設けられた微粉炭
のレベル検知器１７より微粉炭のレベル信号を受
信して駆動モータ９の回転数を制御するようにな
つている。
An embodiment of the fuel supply system of the present invention will be described based on the boiler block diagram shown in FIG. In the figure, 1 is a pulverized coal-fired boiler, 2 is a combustion chamber, 3 is a heating tube, and 4 is a steam drum. The steam drum 4 has a pressure transmitter 5 and a flow rate transmitter in the middle of the piping connected to the steam load. device 6 is connected. Reference numeral 7 denotes a pulverized coal silo, and a rotary valve 8 equipped with a drive motor 9 whose rotation speed can be controlled is attached to the outlet of the lower part of the silo, and is connected to a metering feeder 10 .
A metering feeder motor 11 for controlling the feed of pulverized coal by the rotational speed is attached to the lower part of the metering feeder 10, and is further connected to a fuel pipe 12. This fuel pipe 12 blows combustion air blown from a boiler forced blower 13 and heated by a gas air heater 14 into the discharge part of the quantitative feeder motor 11 to mix pulverized coal and combustion air. It is designed to be fed to boiler 1 and combusted. Note that 15 is a secondary air pipe. 16 is a boiler control panel which receives steam pressure signals and flow rate signals from the pressure transmitter 5 and flow rate transmitter 6 of the boiler 1 to control the rotation speed of the metering feeder motor 11; The rotation speed of the drive motor 9 is controlled by receiving a pulverized coal level signal from a pulverized coal level detector 17 installed at a predetermined height.
第２図に示す他の実施例は定量供給機を変更し
た場合で、この定量供給機１０ａの下部に重量検
知器１８を設けており、ボイラ制御盤１６は重量
検知器１８より微粉炭の重量信号を受信して駆動
モータ９の回転数を制御するようになつており、
其の他は前記の実施例と同じである。 Another embodiment shown in FIG. 2 is a case where the metering feeder is changed, and a weight detector 18 is provided at the bottom of the metering feeder 10a, and the boiler control panel 16 detects the weight of the pulverized coal from the weight detector 18. The number of rotations of the drive motor 9 is controlled by receiving the signal.
The rest is the same as the previous embodiment.
次に上記実施例の作用について説明する。微粉
炭サイロ７よりロータリーバルブ８にて定量供給
機１０に供給された微粉炭は、定量供給機用モー
タ１１によつて送給量がボイラ負荷に見合う量に
制御されながら燃料管１２に供給され、ここでボ
イラ用押込み送風機１３によつて吹込まれ、ガス
エアヒータ１４で加熱された燃焼用空気と混合し
てボイラ１に送給されて燃焼する。
Next, the operation of the above embodiment will be explained. The pulverized coal supplied from the pulverized coal silo 7 to the metering feeder 10 by the rotary valve 8 is supplied to the fuel pipe 12 while the feed amount is controlled by the metering feeder motor 11 to an amount commensurate with the boiler load. Here, the air is blown in by the boiler forced air blower 13, mixed with combustion air heated by the gas air heater 14, and sent to the boiler 1 where it is combusted.
ボイラ制御盤１６は、ボイラ１の圧力迫信器５
と流量発信器６より発信される負荷蒸気の圧力信
号および流量信号を受信し、この両信号からボイ
ラ負荷を算出し、ボイラ負荷に見合う微粉炭を供
給する回転数になるように定量供給機用モータ１
１を回転数制御している。 The boiler control panel 16 includes a pressure compressor 5 of the boiler 1.
The load steam pressure signal and flow rate signal transmitted from the flow rate transmitter 6 are received, the boiler load is calculated from these two signals, and the metering feeder is adjusted so that the rotation speed is set to supply pulverized coal commensurate with the boiler load. Motor 1
The rotation speed of 1 is controlled.
又ボイラ制御盤１６は、定量供給管１０に設け
られたレベル検知器１７より微粉炭のレベルを示
すレベル信号を受信し、ボイラ負荷が高い場合に
は定量供給機１０内の微粉炭レベルの下降が早い
ので、ロータリーバルブ８を高速で回転して大量
の微粉炭を供給し、ボイラ負荷が低い場合には微
粉炭レベルの下降が遅いのでロータリーバルブ８
を低速で回転して微粉炭の供給量を抑制し、ボイ
ラ負荷の高低にかかわらず定量供給機１０内の微
粉炭のレベルが常に一定の高さを保つように駆動
モータ９を回転制御している。 The boiler control panel 16 also receives a level signal indicating the level of pulverized coal from the level detector 17 installed in the metering feed pipe 10, and when the boiler load is high, the level of pulverized coal in the metering feeder 10 decreases. is fast, so rotary valve 8 is rotated at high speed to supply a large amount of pulverized coal, and when the boiler load is low, the pulverized coal level decreases slowly, so rotary valve 8 is rotated at high speed.
The drive motor 9 is rotated at low speed to suppress the supply amount of pulverized coal, and the drive motor 9 is controlled to rotate so that the level of pulverized coal in the quantitative feeder 10 always remains at a constant level regardless of the height of the boiler load. There is.
第２図に示した他の実施例においては、ボイラ
制御盤１６は、定量供給機１０ａに設けられた重
量検知器１８により検知された微粉炭の重量信号
を受信し、ボイラ負荷が高い場合には定量供給機
１０ａ内の微粉炭重量の減少が早いのでロータリ
ーバルブ８を高速で回転して大量の微粉炭を供給
し、ボイラ負荷が低い場合には微粉炭重量の減少
が遅いのでロータリーバルブ８を低速で回転して
微粉炭の供給量を抑制し、ボイラ負荷の高低にか
かわらず定量供給管１０ａ内の微粉炭の重量が常
に一定の値を保つように駆動モータ９を回転制御
している。 In another embodiment shown in FIG. 2, the boiler control panel 16 receives the weight signal of the pulverized coal detected by the weight detector 18 provided in the metering feeder 10a, and when the boiler load is high, Since the weight of pulverized coal in the quantitative feeder 10a decreases quickly, the rotary valve 8 is rotated at high speed to supply a large amount of pulverized coal, and when the boiler load is low, the weight of pulverized coal decreases slowly, so the rotary valve 8 is rotated at high speed. is rotated at a low speed to suppress the supply amount of pulverized coal, and the drive motor 9 is controlled to rotate so that the weight of pulverized coal in the quantitative supply pipe 10a always remains at a constant value regardless of the height of the boiler load. .
このように定量供給管１０，１０ａ内の微粉炭
量は、ボイラ１の負荷即ち定量供給機１０から燃
料管１２に供給される微粉炭量の知少にかかわら
ず常に一定に保たれているので、微粉炭の供給量
にばらつきが生ずることなく、円滑にボイラに供
給される。 In this way, the amount of pulverized coal in the metering supply pipes 10, 10a is always kept constant regardless of the load on the boiler 1, that is, the amount of pulverized coal supplied from the metering feeder 10 to the fuel pipe 12. The pulverized coal is smoothly supplied to the boiler without any variation in the amount of pulverized coal supplied.
以上詳記した通り本発明の微粉炭焚きボイラの
燃料供給装置は、微粉炭の定量供給機に微粉炭量
を検知する検知器を設け、この検知器の信号に基
づいてロータリーバルブの回転数をボイラ負荷に
応じて変化させ定量供給機への微粉炭の供給量を
加減してボイラ負荷の多少にかかわらず定量供給
機内の微粉炭の量を常に一定に保つようにしてい
るので、定量供給機から燃料管に微粉炭が供給さ
れる場合に供給量にばらつきが生ずることなく円
滑に供給され、燃焼に際して微粉炭量の過剰、不
足が生じない。従つて燃焼が安定し、燃焼効率が
向上するとともに、窒素酸化物発生の変動度合が
小さくなり、発生量の制御も容易になる。
As described in detail above, the fuel supply system for a pulverized coal-fired boiler of the present invention includes a pulverized coal quantitative feeder equipped with a detector for detecting the amount of pulverized coal, and based on a signal from this detector, the rotation speed of the rotary valve is controlled. The amount of pulverized coal supplied to the metering feeder is adjusted according to the boiler load, so that the amount of pulverized coal in the metering feeder is always kept constant regardless of the amount of boiler load. When pulverized coal is supplied from the fuel pipe to the fuel pipe, it is smoothly supplied without any variation in the amount of pulverized coal supplied, and there is no excess or shortage of pulverized coal during combustion. Therefore, combustion is stabilized, combustion efficiency is improved, and the degree of fluctuation in nitrogen oxide generation is reduced, making it easier to control the amount of nitrogen oxides generated.
第１図は本発明の微粉炭焚きボイラの燃料供給
装置の一実施例を示す図、第２図は他の実施例を
示す図、第３図は従来の微粉炭焚きボイラの燃料
供給装置を示す図である。
１……ボイラ、７……微粉炭サイロ、８……ロ
ータリーバルブ、１０，１０ａ……定量供給機、
１６……ボイラ制御盤、１７……レベル検知機、
１８……重量検知器。
Fig. 1 shows an embodiment of the fuel supply system for a pulverized coal-fired boiler according to the present invention, Fig. 2 shows another embodiment, and Fig. 3 shows a conventional fuel supply system for a pulverized coal-fired boiler. FIG. 1...Boiler, 7...Pulverized coal silo, 8...Rotary valve, 10, 10a...Quantitative feeder,
16...Boiler control panel, 17...Level detector,
18... Weight detector.
Claims (1)
粉炭を燃焼用空気によりボイラに送給し燃焼させ
るようにした燃料供給装置において、微粉炭サイ
ロと定量供給機との間にロータリーバルブを取付
け、前記定量供給機に設けた微粉炭量の検知器の
検知信号により前記ロータリーバルブを回転制御
するようにしたことを特徴とする微粉炭焚きボイ
ラの燃料供給装置。 ２ 定量供給機に設けた微粉炭量の検知器の検知
信号が、定量供給機内に設けた微粉炭のレベル検
知器のレベル信号とされたことを特徴とする特許
請求の範囲第１項に記載の微粉炭焚きボイラの燃
料供給装置。 ３ 定量供給機に設けた微粉炭量の検知器の検知
信号が定量供給機に設けた重量検知器の重量信号
とされたことを特徴とする特許請求の範囲第１項
に記載の微粉炭焚きボイラの燃料供給装置。[Scope of Claims] 1. In a fuel supply device in which pulverized coal supplied from a pulverized coal silo to a metering feeder is sent to a boiler using combustion air and combusted, there is a gap between the pulverized coal silo and the metering feeder. A fuel supply device for a pulverized coal-fired boiler, characterized in that a rotary valve is attached to the meter, and the rotation of the rotary valve is controlled by a detection signal from a pulverized coal amount detector provided in the quantitative feeder. 2. Claim 1, characterized in that the detection signal of a pulverized coal amount detector provided in the quantitative feeder is a level signal of a pulverized coal level detector provided in the quantitative feeder. Fuel supply system for a pulverized coal-fired boiler. 3. Pulverized coal firing according to claim 1, characterized in that the detection signal of the pulverized coal amount detector provided in the quantitative feeder is the weight signal of the weight detector provided in the quantitative feeder. Boiler fuel supply system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9341385A JPS61252424A (en) | 1985-04-30 | 1985-04-30 | Fuel supplier for pulverized-coal-fired boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9341385A JPS61252424A (en) | 1985-04-30 | 1985-04-30 | Fuel supplier for pulverized-coal-fired boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61252424A JPS61252424A (en) | 1986-11-10 |
| JPH026967B2 true JPH026967B2 (en) | 1990-02-14 |
Family
ID=14081611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9341385A Granted JPS61252424A (en) | 1985-04-30 | 1985-04-30 | Fuel supplier for pulverized-coal-fired boiler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61252424A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6251954B2 (en) * | 2013-01-17 | 2017-12-27 | 宇部興産機械株式会社 | Grinding raw material combustion system and control method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5847726A (en) * | 1981-09-09 | 1983-03-19 | Takemoto Denki Keiki Kk | Constant quantity feeding device |
-
1985
- 1985-04-30 JP JP9341385A patent/JPS61252424A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5847726A (en) * | 1981-09-09 | 1983-03-19 | Takemoto Denki Keiki Kk | Constant quantity feeding device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61252424A (en) | 1986-11-10 |
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