JPS63315808A - Operation of circulating type fluidized bed boiler - Google Patents

Operation of circulating type fluidized bed boiler

Info

Publication number
JPS63315808A
JPS63315808A JP14792887A JP14792887A JPS63315808A JP S63315808 A JPS63315808 A JP S63315808A JP 14792887 A JP14792887 A JP 14792887A JP 14792887 A JP14792887 A JP 14792887A JP S63315808 A JPS63315808 A JP S63315808A
Authority
JP
Japan
Prior art keywords
combustor
outlet
differential pressure
circulating
hot recycle
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.)
Granted
Application number
JP14792887A
Other languages
Japanese (ja)
Other versions
JP2540333B2 (en
Inventor
Makoto Kono
誠 河野
Suminao Tomoyasu
純直 友保
Hisahiro Osaka
苧坂 寿宏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsui Engineering and Shipbuilding Co Ltd
Original Assignee
Mitsui Engineering and Shipbuilding Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsui Engineering and Shipbuilding Co Ltd filed Critical Mitsui Engineering and Shipbuilding Co Ltd
Priority to JP62147928A priority Critical patent/JP2540333B2/en
Publication of JPS63315808A publication Critical patent/JPS63315808A/en
Application granted granted Critical
Publication of JP2540333B2 publication Critical patent/JP2540333B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Fluidized-Bed Combustion And Resonant Combustion (AREA)

Abstract

PURPOSE:To maintain combustion efficiency and desulfurizing reaction at high levels even under the lowered load by circulating back the circulation bed matter positively from the inside of a hot recycle to the inside of a combustor so that the differential pressure between neighborhood of the primary air outlet in the combustor and the outlet of the combustor may reach a fixed value. CONSTITUTION:A command of a positive flow back of the circulating bed matter from the inside of a hot recycle 18 to the inside of a combustor 1 is performed by a control system so that the differential pressure DELTAp between an outlet 12A of the primary feed pipe set within the combustor and an outlet 1A of a combustor 1 may become constant or a predetermined value for a load of the boiler. If the differential pressure DELTAp is less than the fixed value, an opening degree of a control valve 32 is increased. When the air G is jetted out of a nozzle 30 into a hot recycle pipe 5, a circulating bed matter R within the hot recycle 18 is routed back into the combustor 1, and a combustion efficiency and desulfurizing reaction within the combustor 1 are maintained at high levels. On the other hand, when the differential pressure DELTAp comes to a fixed value, the control valve 32 is shut to stop a flow back of the circulating bed matter R.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は循環型流動層ボイラの運転方法に関する。更に
詳しくは負荷が下がった場合でも燃焼効率および脱硫反
応を高く維持する循環型流動層ボイラの運転方法に関す
るものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of operating a circulating fluidized bed boiler. More specifically, the present invention relates to a method of operating a circulating fluidized bed boiler that maintains high combustion efficiency and desulfurization reaction even when the load is reduced.

〔従来技術〕[Prior art]

排ガスの排出基準を満たしながら固体燃料を効率的に燃
焼させるボイラとして、砂利等の比較的大粒の粗粒材で
形成された流動層(デンスベッド)の上に、燃焼灰およ
び石灰石等の脱硫材の微粒子からなる循環層が配置され
た循環型流動層ボイラが提案されている。
As a boiler that efficiently burns solid fuel while meeting exhaust gas emission standards, combustion ash and desulfurization materials such as limestone are placed on a fluidized bed (dense bed) made of relatively large coarse particles such as gravel. A circulating fluidized bed boiler in which a circulating bed consisting of fine particles is arranged has been proposed.

この循環型流動層ボイラは、負荷が下がってコンバスタ
内の循環ベッド材の量が減少すると、燃焼効率および脱
硫反応が悪化する。
In this circulating fluidized bed boiler, when the load is reduced and the amount of circulating bed material in the combustor is reduced, the combustion efficiency and desulfurization reaction deteriorate.

〔発明の目的〕[Purpose of the invention]

本発明は、かかる問題点を解消するために発明されたも
のであり、その目的は負荷が下がった場合でも燃焼効率
および脱硫反応を変動させることなく高く維持すること
にある。
The present invention was invented to solve these problems, and its purpose is to maintain high combustion efficiency and desulfurization reaction without fluctuation even when the load is reduced.

〔発明の概要〕[Summary of the invention]

かかる目的を達成する本発明は、コンバスタ内に設置さ
れた1次空気の出口出口とコンバスタの出口との間の差
圧(ΔP)が一定又はボイラ負荷に対し予め決められた
値になるようにホットリサイクル内から前記コンバスタ
内に循環ベッド材を積極的に還流することを特徴とする
ものである。
The present invention achieves this object by adjusting the pressure difference (ΔP) between the primary air outlet installed in the combustor and the combustor outlet to be constant or a predetermined value for the boiler load. The present invention is characterized in that the circulation bed material is actively returned to the combustor from within the hot recycling.

ここで、コンバスタ内に設置された1次空気の出口出口
とコンバスタの出口との間の差圧(ΔP)が一定又はボ
イラ負荷に対し予め決められた値になるようにホットリ
サイクル内から前記コンバスタ内に循環ベッド材を積極
的に還流する指令は制御装置によって行われる。すなわ
ち、コンバスタ内に設置された1次空気の出口部分の圧
力とコンバスタの出口近傍部分の圧力との差圧(ΔP)
をコンピューター等で演算し、その差圧(ΔP)が一定
又はボイラ負荷に対し予め決められた値になるようにホ
ットリサイクル内から前記コンバスタ内に循環ベッド材
を積極的に還流させるのである。
Here, the combustor is connected to the combustor from inside the hot recycle so that the differential pressure (ΔP) between the primary air outlet installed in the combustor and the combustor outlet is constant or a predetermined value for the boiler load. The command to actively circulate the recirculating bed material within the chamber is issued by the control device. In other words, the pressure difference (ΔP) between the pressure at the outlet of the primary air installed in the combustor and the pressure near the outlet of the combustor.
is calculated by a computer or the like, and the circulation bed material is actively circulated from the hot recycle to the combustor so that the differential pressure (ΔP) becomes constant or a predetermined value for the boiler load.

ホットリサイクル内からコンバスタ内に還流されるホン
)4環ベツド材は温度が余り低下していないので、コン
バスタ内に戻されてもコンバスタ内の温度に影響を与え
ることはない。
Since the temperature of the four-ring bed material that is returned from the hot recycling to the combustor has not decreased much, it does not affect the temperature inside the combustor even if it is returned to the combustor.

上記のように、本発明は、コンバスタ内に設置された1
次空気の出口近傍とコンバスタの出口との間の差圧(Δ
P)を測定し、その差圧(ΔP)が一定又はボイラ負荷
に対し予め決められた値になるようにホットリサイクル
ラインから前記コンバスタ内に循環ベッド材を積極的に
還流するので、負荷が下がった場合でも燃焼効率および
脱硫反応を高く維持することができるようになる。
As mentioned above, the present invention provides a single
Differential pressure (Δ
P) is measured, and the circulating bed material is actively recycled from the hot recycling line into the combustor so that the differential pressure (ΔP) is constant or a predetermined value for the boiler load, so the load is reduced. This makes it possible to maintain high combustion efficiency and desulfurization reaction even when

(実施例〕 以下、図面によって本発明の構成について説明する。(Example〕 Hereinafter, the configuration of the present invention will be explained with reference to the drawings.

第1図は本発明の方法を採用した循環型流動層ボイラの
概略図であり、燃焼器としてのコンバスタ1と、このコ
ンバスタ1に隣接して設けられた外部熱交換器2と、こ
の外部熱交換器2上に設けられ、かつ、コンバスタ1の
頂部と連結ダクト3を介して連結されたサイクロン4と
、外部熱交換器2とコンバスタ1の下部を連通させるホ
ットリサイクル管5、及びコールドリサイクル管6及び
リフト管6“とにより構成されている。
FIG. 1 is a schematic diagram of a circulating fluidized bed boiler employing the method of the present invention. A cyclone 4 provided on the exchanger 2 and connected to the top of the combustor 1 via a connecting duct 3, a hot recycle pipe 5 and a cold recycle pipe that communicate the external heat exchanger 2 and the lower part of the combustor 1. 6 and a lift pipe 6''.

コンバスタIはデンスベッド領域Aと、循環領域Bより
構成されており、下部のデンスベッド領域Aには砂利等
からなるデンスベッド材7を収容するデンスベッド8が
形成される。また、デンスベッド8には固体燃料として
の石炭9と、硫黄分の捕獲の目的で供給され、かつ、循
環ベッド材の一部となる石灰石とが充填されている。
The combustor I is composed of a dense bed area A and a circulation area B, and a dense bed 8 containing a dense bed material 7 made of gravel or the like is formed in the lower dense bed area A. Further, the dense bed 8 is filled with coal 9 as a solid fuel and limestone which is supplied for the purpose of capturing sulfur content and which becomes part of the circulation bed material.

石炭9及び石灰石はデンスベッド領域Aの上部に設けら
れた燃料供給管10からデンスペンド8内に供給される
。また、デンスベッド領域Aの最下部に設けられた1次
空気供給管12の出口12Aから空気aがコンバスタ1
内に供給される。この空気aは燃焼用としても費やされ
るし、デンスベンド材7を流動化させることにも使用さ
れる。
Coal 9 and limestone are supplied into the dense spend 8 from a fuel supply pipe 10 provided at the upper part of the dense bed area A. In addition, air a is supplied to the combustor 1 from the outlet 12A of the primary air supply pipe 12 provided at the bottom of the dense bed area A.
supplied within. This air a is used not only for combustion but also for fluidizing the dense bend material 7.

上記循環領域Bは、燃焼によって発生したカーボン、燃
焼灰、及び微粒子化した石灰石が浮遊循環する循環層1
5を形成している。この循環N15にはダクト16より
二次空気すが供給され、より完全な燃焼が行なわれる。
The circulation area B is a circulation layer 1 in which carbon generated by combustion, combustion ash, and finely divided limestone float and circulate.
5 is formed. Secondary air is supplied to this circulation N15 from a duct 16 to achieve more complete combustion.

デンスベッド領域A及び循環領域B内で発生したカーボ
ン、燃焼灰、及び微粒子化した石灰石等からなる循環ベ
ッド材Rを含むガスGは連結ダクト3を経由してサイク
ロン4に供給され、ここでガスGと循環ベッド材Rに分
離される。
The gas G containing the circulation bed material R made of carbon, combustion ash, finely divided limestone, etc. generated in the dense bed area A and the circulation area B is supplied to the cyclone 4 via the connecting duct 3, where the gas It is separated into G and circulating bed material R.

この分離ガスGは、ダクト26を経て対流伝熱部25内
に供給され、この対流伝熱部25内に設置されている過
熱器27、蒸発部33、エコノマイザ34、ガス式空気
予熱器35を加熱したあと、排ガスG′として大気中に
放出される。
This separated gas G is supplied into the convection heat transfer section 25 through the duct 26, and is installed in the convection heat transfer section 25, including a superheater 27, an evaporator 33, an economizer 34, and a gas air preheater 35. After heating, it is released into the atmosphere as exhaust gas G'.

一方、サイクロン4によって捕集された循環ベッド材R
は、その下部のディプレグ17より外部熱交換器2のホ
ントウェル18内に自重で落下する。この外部熱交換器
2の下部には流動空気供給管19が設けられており、循
環へノド材Rが流動化されている。
On the other hand, the circulating bed material R collected by cyclone 4
falls into the real well 18 of the external heat exchanger 2 from the lower dipleg 17 under its own weight. A fluidizing air supply pipe 19 is provided at the lower part of the external heat exchanger 2, and the gutter material R is fluidized to be circulated.

ホットウェル18内に供給された循環ベッド材Rは、隔
壁20の上端よりオーバフローして熱交換部22内に移
動し、蒸発器28内の蒸気を加熱する。この蒸発器28
で蒸発した蒸気はドラム31に導かれる。
The circulating bed material R supplied into the hot well 18 overflows from the upper end of the partition wall 20 and moves into the heat exchange section 22 to heat the steam within the evaporator 28 . This evaporator 28
The evaporated steam is led to the drum 31.

また、ホットウェル18内のホットな循環ベッド材Rは
ホットウェル18の下部とコンバスタ1の下部を連通ず
るホットリサイクル管5を通ってコンバスタl内に還流
され、また、熱交換部22内で熱が奪われた循環ベッド
材R゛は熱交換部22の下部とコンバスタ1の下部とを
連通ずるコールドリサイクル管6を通ってコンバスタl
内に還流される。
Further, the hot circulation bed material R in the hot well 18 is returned to the combustor 1 through a hot recycling pipe 5 that communicates the lower part of the hot well 18 with the lower part of the combustor 1, and is also heated in the heat exchange section 22. The circulating bed material R' from which the combustor 1 has been removed passes through the cold recycling pipe 6 that communicates the lower part of the heat exchange section 22 with the lower part of the combustor 1 and returns to the combustor 1.
It is refluxed into the interior.

上記外部熱交換器2内のガスは外部熱交換器2の頂部と
コンバスタ1の循環領域Bに接続されているガス抜管2
4を通ってコンバスタ1の循環領域B内に戻される。
The gas in the external heat exchanger 2 is discharged through a gas vent pipe 2 connected to the top of the external heat exchanger 2 and the circulation area B of the combustor 1.
4 and is returned to the circulation area B of the combustor 1.

前記ホットリサイクル管5はL字型をしており、そのコ
ーナ一部5Aにノズル30が取り付けられている。この
ノズル30には制御弁32を経由して制御用空気が導入
される。
The hot recycling pipe 5 is L-shaped, and a nozzle 30 is attached to a corner portion 5A thereof. Control air is introduced into this nozzle 30 via a control valve 32.

一方、1次空気供給管12の出口近傍12Aに設置され
た圧力検出器36によって、その部分の圧力を測定し、
更に、コンバスタ1の出口1A、すなわち、コンバスタ
1の頂部に設置された圧力検出器37によって、その部
分の圧力を測定する。これらの信号はコンピューター3
8に入力され、当該コンピューター38によって1次空
気供給管12の出口12Aの圧力とコンバスタlの出口
IAの圧力との差圧(ΔP)が演算され、その演算結果
に基づいて制御弁32の開閉が行われる。
On the other hand, a pressure detector 36 installed near the outlet 12A of the primary air supply pipe 12 measures the pressure at that part,
Further, a pressure detector 37 installed at the outlet 1A of the combustor 1, that is, at the top of the combustor 1, measures the pressure at that part. These signals are sent to computer 3
8, the computer 38 calculates the differential pressure (ΔP) between the pressure at the outlet 12A of the primary air supply pipe 12 and the pressure at the outlet IA of the combustor 1, and opens and closes the control valve 32 based on the calculation result. will be held.

すなわち、1次空気供給管12の出口12Aの圧力とコ
ンバスタ1の出口IAの圧力との差圧(ΔP)が設定値
より少ない場合、制御弁32の開度が増加され、ホット
リサイクル管5内にノズル30から空気G1が噴出され
ると、ホットリサイクル18内の循環ベッド材Rがコン
バスタ1内に還流される。このため、コンバスタ1内の
燃焼効率および脱硫反応が高く維持されることになる。
That is, when the pressure difference (ΔP) between the pressure at the outlet 12A of the primary air supply pipe 12 and the pressure at the outlet IA of the combustor 1 is less than the set value, the opening degree of the control valve 32 is increased, and the pressure inside the hot recycle pipe 5 is increased. When the air G1 is ejected from the nozzle 30, the circulating bed material R in the hot recycle 18 is returned to the combustor 1. Therefore, the combustion efficiency and desulfurization reaction within the combustor 1 are maintained high.

一方、1次空気供給管12の出口12Aの圧力とコンバ
スタ1の出口IAの圧力との差圧(ΔP)が設定値にな
ると、制御弁32が閉止され、循環ベッド材Rの還流が
停止される。
On the other hand, when the pressure difference (ΔP) between the pressure at the outlet 12A of the primary air supply pipe 12 and the pressure at the outlet IA of the combustor 1 reaches the set value, the control valve 32 is closed and the reflux of the circulating bed material R is stopped. Ru.

〔発明の効果〕〔Effect of the invention〕

上記のように、本発明は、コンバスタ内に設置された1
次空気の出口近傍とコンバスタの出口との間の差圧(Δ
P)を測定し、その差圧(ΔP)が一定になるようにホ
ットリサイクルラインから前記コンバスタ内に循環ベッ
ド材を積極的に還流するので、負荷が下がった場合でも
燃焼効率および脱硫反応を高く維持することができるよ
うになる。
As mentioned above, the present invention provides a single
Differential pressure (Δ
P) is measured, and the circulation bed material is actively refluxed from the hot recycle line into the combustor so that the differential pressure (ΔP) is constant, so even when the load is reduced, combustion efficiency and desulfurization reaction can be increased. be able to maintain it.

【図面の簡単な説明】[Brief explanation of the drawing]

図は本発明の運転方法を採用した循環型流動層ボイラの
概略図である。 ■・・・コンバスタ内 12A・・・1次空気供給管の出口、18・・・ホット
リサイクル、R・・・循環ベッド材。
The figure is a schematic diagram of a circulating fluidized bed boiler employing the operating method of the present invention. ■... Inside the combustor 12A... Outlet of the primary air supply pipe, 18... Hot recycling, R... Circulating bed material.

Claims (1)

【特許請求の範囲】[Claims] コンバスタ内に設置された1次空気の出口近傍とコンバ
スタの出口との間の差圧(ΔP)を測定し、その差圧(
ΔP)が一定又はボイラ負荷に対して予め決められた値
になるようにホットリサイクル内から前記コンバスタ内
に循環ベッド材を積極的に還流することを特徴とする循
環型流動層ボイラの運転方法。
The differential pressure (ΔP) between the vicinity of the primary air outlet installed in the combustor and the combustor outlet is measured, and the differential pressure (
A method for operating a circulating fluidized bed boiler, characterized in that circulating bed material is actively returned from the hot recycle to the combustor so that ΔP) is constant or a predetermined value with respect to the boiler load.
JP62147928A 1987-06-16 1987-06-16 Operation method of circulating fluidized bed boiler Expired - Lifetime JP2540333B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62147928A JP2540333B2 (en) 1987-06-16 1987-06-16 Operation method of circulating fluidized bed boiler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62147928A JP2540333B2 (en) 1987-06-16 1987-06-16 Operation method of circulating fluidized bed boiler

Publications (2)

Publication Number Publication Date
JPS63315808A true JPS63315808A (en) 1988-12-23
JP2540333B2 JP2540333B2 (en) 1996-10-02

Family

ID=15441247

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62147928A Expired - Lifetime JP2540333B2 (en) 1987-06-16 1987-06-16 Operation method of circulating fluidized bed boiler

Country Status (1)

Country Link
JP (1) JP2540333B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115479270A (en) * 2022-09-20 2022-12-16 中国科学院工程热物理研究所 Rapid load-variable circulating fluidized bed boiler and load adjusting method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61186705A (en) * 1985-02-13 1986-08-20 Mitsui Eng & Shipbuild Co Ltd Fuel supply method for high speed fluidized bed burning equipment
JPS6246111A (en) * 1985-08-21 1987-02-28 Mitsubishi Heavy Ind Ltd Method to control differential pressure of combustor of high velocity fluidized-bed boiler

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61186705A (en) * 1985-02-13 1986-08-20 Mitsui Eng & Shipbuild Co Ltd Fuel supply method for high speed fluidized bed burning equipment
JPS6246111A (en) * 1985-08-21 1987-02-28 Mitsubishi Heavy Ind Ltd Method to control differential pressure of combustor of high velocity fluidized-bed boiler

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115479270A (en) * 2022-09-20 2022-12-16 中国科学院工程热物理研究所 Rapid load-variable circulating fluidized bed boiler and load adjusting method thereof

Also Published As

Publication number Publication date
JP2540333B2 (en) 1996-10-02

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