JP2662633B2 - Cooling method of pressurized fluidized bed boiler combustion ash - Google Patents
Cooling method of pressurized fluidized bed boiler combustion ashInfo
- Publication number
- JP2662633B2 JP2662633B2 JP5120597A JP12059793A JP2662633B2 JP 2662633 B2 JP2662633 B2 JP 2662633B2 JP 5120597 A JP5120597 A JP 5120597A JP 12059793 A JP12059793 A JP 12059793A JP 2662633 B2 JP2662633 B2 JP 2662633B2
- Authority
- JP
- Japan
- Prior art keywords
- ash
- bed boiler
- pressurized fluidized
- fluidized bed
- combustion ash
- 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 - Fee Related
Links
Landscapes
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
- Gasification And Melting Of Waste (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、灰を固化するのに適す
る加圧流動層ボイラ燃焼灰の冷却方法、詳しくは、加圧
流動層ボイラ燃焼灰の固化特性を向上させるための灰の
冷却方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of cooling pressurized fluidized bed boiler combustion ash suitable for solidifying ash, and more particularly, to cooling of ash for improving solidification characteristics of pressurized fluidized bed boiler combustion ash. It is about the method.
【０００２】[0002]
【従来の技術】従来から、石炭と石灰石（脱硫剤）との
混合体を流動媒体とし、コンプレッサーからの加圧空気
で加圧状態、すなわち、酸素の濃度が高められた状態に
して、流動媒体を流動化させて効率よく燃焼させるよう
にした加圧流動層ボイラ（ＰＦＢＣ）がよく知られてい
る（例えば、特開昭６３−１０１６０２号公報参照）。2. Description of the Related Art Conventionally, a mixture of coal and limestone (desulfurizing agent) has been used as a fluid medium, and the fluid medium is pressurized by pressurized air from a compressor, that is, in a state where the oxygen concentration is increased. A pressurized fluidized-bed boiler (PFBC) that fluidizes and burns efficiently is well known (for example, see JP-A-63-101602).
【０００３】[0003]
【発明が解決しようとする課題】従来、加圧流動層ボイ
ラ燃焼灰は、常圧に戻した後、取り出されているが、灰
中のＣａＯ（石灰石（ＣａＣＯ3 ）が熱分解したもの）
が燃焼後の排ガス中のＣＯ2 と反応して再炭酸化され
（ＣａＯ＋ＣＯ2 →ＣａＣＯ3 ）、灰中の活性なＣａＯ
が殆んどなくなる冷却方法となっている。このため、取
り出した灰を固化させた場合の強度が小さくなり、路盤
材等に利用することができなかった。Conventionally, the combustion ash of a pressurized fluidized-bed boiler is taken out after returning to normal pressure, but CaO in the ash (limestone (CaCO 3 ) is thermally decomposed).
Reacts with CO 2 in the exhaust gas after combustion and is recarbonated (CaO + CO 2 → CaCO 3 ), and active CaO in the ash
Is a cooling method that almost eliminates. For this reason, the strength when the taken out ash is solidified becomes small, and the ash cannot be used as a roadbed material or the like.
【０００４】本発明は上記の点に鑑みなされたもので、
その目的は、ＰＦＢＣ灰を冷却するに際して、常圧に戻
す過程、急速に冷却する過程、灰冷却器内のＣＯ2 に富
むガスを迅速に空気に置換する過程を同時に行うことに
より、抜出灰中のＣａＯ割合を多くして、固化させた場
合の強度が大となるＰＦＢＣ灰の冷却方法を提供するこ
とにある。[0004] The present invention has been made in view of the above points,
The purpose is to simultaneously perform the process of cooling PFBC ash to normal pressure, the process of rapid cooling, and the process of rapidly replacing CO 2 rich gas in the ash cooler with air, thereby removing the extracted ash. It is an object of the present invention to provide a method for cooling PFBC ash in which the strength when solidified by increasing the ratio of CaO therein is increased.
【０００５】[0005]
【課題を解決するための手段及び作用】 上記の目的を
達成するために、本発明の加圧流動層ボイラ燃焼灰の冷
却方法は、加圧流動層ボイラ燃焼灰を取り出すに際し、
該燃焼灰を灰冷却器内に抜き出した後、灰冷却器内の圧
力を大気圧に戻すと同時に、灰冷却器内に空気を供給し
て燃焼灰を冷却するとともに、灰冷却器内の炭酸ガスに
富む残留ガスを空気に置換して燃焼灰中のＣａＯの再炭
酸化を抑制することを特徴としている。In order to achieve the above object, a method for cooling pressurized fluidized-bed boiler combustion ash according to the present invention includes the steps of:
After extracting the combustion ash into the ash cooler, the pressure in the ash cooler is returned to the atmospheric pressure, and at the same time, air is supplied into the ash cooler to cool the combustion ash and the carbon dioxide in the ash cooler is reduced. Re-carbonization of CaO in combustion ash by replacing gas-rich residual gas with air
It is characterized by suppressing oxidation .
【０００６】上記の方法により、ＰＦＢＣ灰を大気圧雰
囲気に戻すと同時に、空気により残留ガスを置換し、灰
の周囲のＣＯ2 分圧を短時間できわめて低くし、ＣＯ2
によるＣａＯの再炭酸化速度の速い７５０℃前後の温度
域を急速に通過させる。[0006] By the above method, at the same time returning the PFBC ash atmospheric pressure, replacing the residual gas by the air, and very low in a short time of CO 2 partial pressure around the ash, CO 2
Rapidly pass through a temperature range around 750 ° C. where the rate of recarbonation of CaO is high.
【０００７】[0007]
【実施例】以下、本発明を実施例に基づいてさらに詳細
に説明するが、本発明は下記実施例に何ら限定されるも
のではなく、その要旨を変更しない範囲において適宜変
更して実施することが可能なものである。図１は、加圧
流動層ボイラ（ＰＦＢＣ）の使用方法の一例として、Ｐ
ＦＢＣ１０を用いた複合発電システムを示し、図２は、
加圧流動層ボイラまわりの詳細を示している。このＰＦ
ＢＣ複合発電システムは、圧力容器１２内に収納した流
動層ボイラ１４から発生する水蒸気で駆動する蒸気ター
ビン１６による発電と、ＰＦＢＣ１０の排ガスを利用す
るガスタービン１８による発電とを組み合わせた複合発
電方式である。EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples, and the present invention may be practiced by appropriately changing the gist of the invention. Is possible. FIG. 1 shows P as an example of a method of using a pressurized fluidized bed boiler (PFBC).
2 shows a combined power generation system using the FBC 10, and FIG.
2 shows details around a pressurized fluidized bed boiler. This PF
The BC combined power generation system is a combined power generation system in which power generation by a steam turbine 16 driven by steam generated from a fluidized bed boiler 14 housed in a pressure vessel 12 and power generation by a gas turbine 18 using exhaust gas of the PFBC 10 are combined. is there.
【０００８】ＰＦＢＣ１０では、石炭と脱硫剤である石
灰石（ＣａＣＯ3 ）との混合体を流動媒体とし、コンプ
レッサー２０からの高圧空気で加圧状態（酸素の濃度が
高められた状態にされて、流動媒体２２を流動化させて
効率よく燃焼させる。ＰＦＢＣ１０内に投入された石灰
石（ＣａＣＯ3 ）は熱分解してＣａＯとなり、燃焼ガス
中のＳＯｘを除去する。発生した熱は、流動層内伝熱管
２４により水蒸気として回収され、蒸気タービン発電機
２６を駆動させる。なお、圧力容器１２内の温度は一例
として８５０℃前後、圧力は一例として２０kg／cm G前
後である。In the PFBC 10, a mixture of coal and limestone (CaCO 3 ) as a desulfurizing agent is used as a fluid medium, and is pressurized with high-pressure air from a compressor 20 (in a state where the concentration of oxygen is increased, The medium 22 is fluidized and burned efficiently, and the limestone (CaCO 3 ) charged into the PFBC 10 is thermally decomposed into CaO to remove SOx in the combustion gas. The steam is recovered by the steam 24 and drives the steam turbine generator 26. The temperature inside the pressure vessel 12 is, for example, about 850 ° C., and the pressure is, for example, about 20 kg / cm G.
【０００９】一方、まだ充分に圧力、温度ともに高いＰ
ＦＢＣ１０からの排ガスは、サイクロン等の集じん装置
２８、さらに、セラミックフィルター等の高性能脱じん
装置３０により脱じんされた後、ガスタービン１８を駆
動させる。ガスタービン１８は、燃焼用空気を供給する
コンプレッサー２０を駆動させるとともに、直結された
発電機３２を駆動させる。On the other hand, P is still sufficiently high in both pressure and temperature.
The exhaust gas from the FBC 10 is removed by a dust collecting device 28 such as a cyclone and a high-performance dust removing device 30 such as a ceramic filter, and then drives the gas turbine 18. The gas turbine 18 drives the compressor 20 that supplies the combustion air, and also drives the generator 32 that is directly connected.
【００１０】燃焼時に発生する硫黄酸化物（ＳＯｘ）
は、流動層内で脱硫剤（生石灰）により吸収され、ま
た、窒素酸化物（ＮＯｘ）は、燃焼温度が低いことなど
から、その発生を低く抑えることができる。排ガスは、
排出規制値以下にＳＯｘ、ＮＯｘ、煤じんを低減し、排
ガスクーラー（節炭器）３４にて熱回収した後、煙突３
６から排出される。３８は混合機、４０は燃料ポンプ、
４２は低圧ガスタービン、４４は低圧コンプレッサー、
４６はインタークーラー、４８は脱硝装置、５０は復水
器、５２は循環水ポンプ、５４は復水ポンプ、５６は低
圧ヒーター、５８は脱気器、６０は給水ポンプである。[0010] Sulfur oxide (SOx) generated during combustion
Is absorbed by the desulfurizing agent (quick lime) in the fluidized bed, and the generation of nitrogen oxides (NOx) can be suppressed low due to the low combustion temperature. Exhaust gas is
After reducing SOx, NOx, and soot below the emission regulation value, and collecting heat in an exhaust gas cooler (coal saving device) 34, the stack 3
Exhausted from 6. 38 is a mixer, 40 is a fuel pump,
42 is a low-pressure gas turbine, 44 is a low-pressure compressor,
46 is an intercooler, 48 is a denitration device, 50 is a condenser, 52 is a circulating water pump, 54 is a condensate pump, 56 is a low-pressure heater, 58 is a deaerator, and 60 is a feedwater pump.
【００１１】上記のように構成された加圧流動層（ＰＦ
ＢＣ）複合発電システムにおいて、流動層ボイラ１４の
下部、サイクロン等の集じん装置２８の下部、及びセラ
ミックフィルター等の高性能脱じん装置３０の下部に、
それぞれ弁６２ａ、６２ｂ、６２ｃ及びエクスパンショ
ンジョイント６４ａ、６４ｂ、６４ｃを介して灰冷却器
６６ａ、６６ｂ、６６ｃが接続されている。これらの灰
冷却器の下側には、それぞれエクスパンションジョイン
ト６８ａ、６８ｂ、６８ｃ及び弁７０ａ、７０ｂ、７０
ｃが接続されている。The pressurized fluidized bed (PF) constructed as described above
BC) In the combined cycle power generation system, the lower part of the fluidized-bed boiler 14, the lower part of the dust collector 28 such as a cyclone, and the lower part of the high-performance dust remover 30 such as a ceramic filter,
Ash coolers 66a, 66b, 66c are connected via valves 62a, 62b, 62c and expansion joints 64a, 64b, 64c, respectively. Below these ash coolers are expansion joints 68a, 68b, 68c and valves 70a, 70b, 70c respectively.
c is connected.
【００１２】灰冷却器６６ａ、６６ｂ、６６ｃの一端に
は、それぞれ冷却用の空気を供給する空気供給管７２
ａ、７２ｂ、７２ｃが接続され、灰冷却器６６ａ、６６
ｂ、６６ｃの他端には、ＣＯ2 に富むガス及び灰の冷却
に使用された空気を排出するための排気管７４ａ、７４
ｂ、７４ｃがそれぞれ接続され、これらの排気管はセラ
ミックフィルター等の高性能脱じん装置３０の下流の排
ガス管７６に接続されている。An air supply pipe 72 for supplying cooling air is provided at one end of each of the ash coolers 66a, 66b, 66c.
a, 72b, 72c are connected and the ash coolers 66a, 66
b, and the other end of 66c, the exhaust pipe for discharging air which has been used to cool the gas and ash rich in CO 2 74a, 74
b and 74c are connected to each other, and these exhaust pipes are connected to an exhaust gas pipe 76 downstream of the high-performance dust removing device 30 such as a ceramic filter.
【００１３】つぎに、本実施例における作用について説
明する。ＰＦＢＣ灰は、流動層ボイラ１４からの灰、サ
イクロン等の集じん装置２８からの灰、及びセラミック
フィルター等の高性能脱じん装置３０からの灰からなる
が、説明を簡単にするために、一例として流動層ボイラ
１４からの灰を冷却する場合について説明する。Next, the operation of this embodiment will be described. The PFBC ash includes ash from the fluidized-bed boiler 14, ash from the dust collector 28 such as a cyclone, and ash from the high-performance dust remover 30 such as a ceramic filter. The case where the ash from the fluidized bed boiler 14 is cooled will be described.
【００１４】まず、灰冷却器６６ａの上流の弁６２ａを
開け、灰冷却器６６ａの下流の弁７０ａを閉じて灰冷却
器６６ａ内に灰を落下・導入した後、弁６２ａを閉じ
る。ついで、灰冷却器６６ａ内の燃焼ガスをパージして
灰冷却器６６ａ内を大気圧に戻すと同時に、空気により
ＣＯ2 リッチの残留ガスを置換し、灰の周囲のＣＯ2 分
圧を短時間できわめて小さい値（数百ppm ）とし、ＣＯ
2 による再炭酸化速度の速い７５０℃前後の温度域での
再炭酸化反応を抑える。灰冷却器６６ａからの排ガス
は、排気管７４ａを通って集じん装置に導入される。他
の灰冷却器６６ｂ、６６ｃについても同様の操作が行わ
れる。First, the valve 62a upstream of the ash cooler 66a is opened, the valve 70a downstream of the ash cooler 66a is closed, and ash is dropped and introduced into the ash cooler 66a, and then the valve 62a is closed. Then, the combustion gas in the ash cooler 66a is purged to return the inside of the ash cooler 66a to the atmospheric pressure, and at the same time, the CO 2 -rich residual gas is replaced with air to reduce the CO 2 partial pressure around the ash for a short time. To a very small value (several hundred ppm)
2. The recarbonation reaction in a temperature range around 750 ° C. where the recarbonation rate by 2 is high is suppressed. The exhaust gas from the ash cooler 66a is introduced into the dust collector through the exhaust pipe 74a. Similar operations are performed for the other ash coolers 66b and 66c.
【００１５】[0015]
【発明の効果】 本発明は上記のように構成されている
ので、つぎのような効果を奏する。 （１） 加圧流動層ボイラ燃焼灰の冷却に際して、常圧
に戻す過程、急速に冷却する過程、及び灰冷却器内のＣ
Ｏ２リッチのガスを迅速に空気に置換する過程を同時に
行うので、灰の周囲のＣＯ２分圧を短時間できわめて低
い値とし、ＣＯ２による再炭酸化速度の速い７５０℃前
後の温度域を急速に通過させ、再炭酸化を抑えることが
できる。このため、抜出灰中のＣａＯ割合が多くなり、
抜出灰を固化させた場合にその強度が大きくなり、路盤
材等への利用を促進することができる。The present invention is configured as described above, and has the following effects. (1) When cooling the combustion ash of a pressurized fluidized bed boiler, the process of returning to normal pressure, the process of rapidly cooling, and the C in the ash cooler
Since the process of rapidly replacing the O 2 -rich gas with air is performed simultaneously, the partial pressure of CO 2 around the ash is set to an extremely low value in a short time, and the temperature range around 750 ° C. where the recarbonation rate by CO 2 is high is high. , And recarbonation can be suppressed. For this reason, the CaO ratio in the extracted ash increases,
The intensity Ri is Na large when solidifying the extraction ash, roadbed
Ru can be used to promote the use of the wood and the like.
【図１】本発明の加圧流動層ボイラ燃焼灰の冷却方法を
実施する装置の一例を示す系統図である。FIG. 1 is a system diagram showing an example of an apparatus for implementing a method for cooling combustion ash of a pressurized fluidized-bed boiler of the present invention.
【図２】図１における要部の拡大図である。FIG. 2 is an enlarged view of a main part in FIG.
１０ 加圧流動層ボイラ（ＰＦＢＣ） １２ 圧力容器 １４ 流動層ボイラ １６ 蒸気タービン １８ ガスタービン ２８ 集じん装置 ３０ 高性能脱じん装置 ６２ａ 弁 ６６ａ 灰冷却器 ７０ａ 弁 ７２ａ 空気供給管 ７４ａ 排気管 ７６ 排ガス管 DESCRIPTION OF SYMBOLS 10 Pressurized fluidized-bed boiler (PFBC) 12 Pressure vessel 14 Fluidized-bed boiler 16 Steam turbine 18 Gas turbine 28 Dust collecting device 30 High-performance dust removing device 62a Valve 66a Ash cooler 70a Valve 72a Air supply pipe 74a Exhaust pipe 76 Exhaust gas pipe
Claims (1)
し、該燃焼灰を灰冷却器内に抜き出した後、灰冷却器内
の圧力を大気圧に戻すと同時に、灰冷却器内に空気を供
給して燃焼灰を冷却するとともに、灰冷却器内の炭酸ガ
スに富む残留ガスを空気に置換して燃焼灰中のＣａＯの
再炭酸化を抑制することを特徴とする加圧流動層ボイラ
燃焼灰の冷却方法。When extracting the combustion ash from a pressurized fluidized bed boiler, the combustion ash is extracted into an ash cooler, and then the pressure in the ash cooler is returned to atmospheric pressure, and at the same time, air is introduced into the ash cooler. While supplying and cooling the combustion ash, the residual gas rich in carbon dioxide in the ash cooler is replaced with air to reduce the amount of CaO in the combustion ash.
A method for cooling combustion ash of a pressurized fluidized-bed boiler, characterized by suppressing recarbonation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5120597A JP2662633B2 (en) | 1993-04-23 | 1993-04-23 | Cooling method of pressurized fluidized bed boiler combustion ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5120597A JP2662633B2 (en) | 1993-04-23 | 1993-04-23 | Cooling method of pressurized fluidized bed boiler combustion ash |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06307621A JPH06307621A (en) | 1994-11-01 |
| JP2662633B2 true JP2662633B2 (en) | 1997-10-15 |
Family
ID=14790200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5120597A Expired - Fee Related JP2662633B2 (en) | 1993-04-23 | 1993-04-23 | Cooling method of pressurized fluidized bed boiler combustion ash |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2662633B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU6749598A (en) * | 1997-04-14 | 1998-11-11 | Ebara Corporation | Pressurized fluidized-bed combined-cycle electric generating system |
| BRPI0621955A2 (en) * | 2006-08-22 | 2011-12-20 | Magaldi Power Spa | system for extracting and cooling dry combustion waste of a type suitable for use in combination with a combustion chamber and method for extracting and dry cooling combustion waste from a combustion chamber |
| AU2006347454A1 (en) * | 2006-08-22 | 2008-02-28 | Magaldi Power S.P.A. | Extraction and air/water cooling system for large quantities of heavy ashes |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE461679B (en) * | 1988-07-06 | 1990-03-12 | Abb Stal Ab | SHOOLERS FOR POWER PLANT |
-
1993
- 1993-04-23 JP JP5120597A patent/JP2662633B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06307621A (en) | 1994-11-01 |
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