JPH03252337A - Treating method of ash from boiler using coal - Google Patents
Treating method of ash from boiler using coalInfo
- Publication number
- JPH03252337A JPH03252337A JP2045665A JP4566590A JPH03252337A JP H03252337 A JPH03252337 A JP H03252337A JP 2045665 A JP2045665 A JP 2045665A JP 4566590 A JP4566590 A JP 4566590A JP H03252337 A JPH03252337 A JP H03252337A
- Authority
- JP
- Japan
- Prior art keywords
- coal
- ash
- oxygen
- boiler
- water
- 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
Links
- 239000003245 coal Substances 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000001301 oxygen Substances 0.000 claims abstract description 15
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 15
- 239000002893 slag Substances 0.000 claims abstract description 14
- 239000002956 ash Substances 0.000 claims abstract description 12
- 239000010883 coal ash Substances 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000002485 combustion reaction Methods 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 12
- 238000003672 processing method Methods 0.000 claims 1
- 230000005484 gravity Effects 0.000 abstract description 6
- 239000000446 fuel Substances 0.000 abstract description 3
- 238000010791 quenching Methods 0.000 abstract description 2
- 230000000171 quenching effect Effects 0.000 abstract description 2
- 239000002912 waste gas Substances 0.000 abstract 1
- 239000010881 fly ash Substances 0.000 description 15
- 239000012717 electrostatic precipitator Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000012716 precipitator Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は事業用、産業用の発電プラント等における石炭
焚ボイラの石炭灰（フライアッシュ）の処理方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for processing coal ash (fly ash) from coal-fired boilers in commercial and industrial power plants and the like.
〔従来の技術］
第２図は従来の石炭焚ボイラの一例の流れ系統を示す図
である。[Prior Art] FIG. 2 is a diagram showing a flow system of an example of a conventional coal-fired boiler.
石炭焚ボイラの主な構成は石炭を粉砕供給する石炭粉砕
ミル（０２）、粉砕された微粉炭を燃焼させるボイラ（
０４）、脱硝装置（０７）、エアヒータ（０９）、電気
集塵器（ｌＯ）、脱硫装置（１１）、押込通風機（ｏ３
）（１２）、誘引通風機（Ｉ３）および煙突（１４）で
ある。図中（０１）は石炭バンカ、（ｏ５）はバーナ風
箱である。The main components of a coal-fired boiler are a coal crushing mill (02) that crushes and supplies coal, and a boiler (02) that burns the crushed pulverized coal.
04), denitrification equipment (07), air heater (09), electric precipitator (lO), desulfurization equipment (11), forced draft fan (o3
) (12), induced draft fan (I3) and chimney (14). In the figure, (01) is a coal bunker, and (o5) is a burner-like box.
石炭はボイラ（０４）内で燃焼し、その燃焼ガスはボイ
ラ（０４）を構成する伝熱管へ熱を与えなからボイラ後
流へ流れ、最終的には煙突（１４）から排気される。Coal is burned in the boiler (04), and the combustion gas does not impart heat to the heat exchanger tubes that make up the boiler (04), but flows downstream of the boiler and is finally exhausted from the chimney (14).
石炭には必ず鉱物質の灰を含むので、石炭焚ボイラ排ガ
スには微粒法いわゆるフライアッシュを含む。そこで煙
突（１４）から排気する前にフライアッシュを電気集塵
器（１０）で除去するようになっている。一般にフライ
アッシュは、この電気集塵器（１０）で積極的に除去す
るほか、脱硝装置（ｏ７）の下方のホッパ（０８）やボ
イラ下部のホッパ（ｏ６）がらも一部排出される。従来
の石炭焚ボイラでは、これらのフライアッシュは集めら
れて灰捨場に廃棄されている。Since coal always contains mineral ash, coal-fired boiler exhaust gas contains so-called fly ash. Therefore, the fly ash is removed by an electrostatic precipitator (10) before being exhausted from the chimney (14). In general, fly ash is not only actively removed by the electrostatic precipitator (10), but also partially discharged from the hopper (08) below the denitrification device (o7) and the hopper (o6) below the boiler. In conventional coal-fired boilers, these fly ash are collected and disposed of in an ash dump.
前項で述べたように、石炭焚ボイラがら排出されるフラ
イアッシュは、従来その大部分が廃棄されているが、フ
ライアッシュは嵩比重が０．５で、かつ未燃分を含み、
しかも重金属類が付着凝縮しているので、下記問題があ
る。As mentioned in the previous section, most of the fly ash discharged from coal-fired boilers has traditionally been discarded, but fly ash has a bulk specific gravity of 0.5 and contains unburned matter.
Moreover, since heavy metals are attached and condensed, the following problems arise.
１） 嵩比重が０．５と小さいので、処理する際、容量
が大きいという難点がある。1) Since the bulk specific gravity is as small as 0.5, there is a problem in that the capacity is large when processing.
２） 未燃分および溶質分を含むため、処理する際産業
廃棄物指定の処理、例えば排水対策、漏水対策等十分な
対策が必要である。また対策後も経年管理が必要で経費
がかかる。2) Since it contains unburned matter and solutes, it is necessary to take sufficient measures to treat it as designated as industrial waste, such as drainage measures and water leakage measures. Furthermore, even after countermeasures are taken, management is required over time, which is costly.
本発明は、前記従来の課題を解決するために、石炭を燃
料とするボイラの燃焼排ガスから分離される石炭灰−を
、石炭が酸素または酸素富化空気により燃焼する高温炉
に供給して溶融させた後、水中で急冷して水砕スラグと
することを特徴とする石炭焚ボイラの灰処理方法を提案
するものである。In order to solve the above-mentioned conventional problems, the present invention supplies coal ash separated from the combustion exhaust gas of a boiler using coal as fuel to a high-temperature furnace where coal is burned with oxygen or oxygen-enriched air, and melts it. This paper proposes a method for treating ash from coal-fired boilers, which is characterized by quenching the ash in water to form granulated slag.
本発明においては、石炭焚ボイラから排出されるフライ
アッシュを一旦集め、これを石炭が酸素あるいは酸素富
化空気により燃焼する高温炉へ供給して溶融スラグとす
る。更にこれを水中でや、冷して、粒状の水砕スラグと
する。この粒状水砕スラグを定期的に系外へ排出する。In the present invention, fly ash discharged from a coal-fired boiler is once collected and supplied to a high-temperature furnace where coal is burned with oxygen or oxygen-enriched air to form molten slag. This is then cooled in water to form granular granulated slag. This granular granulated slag is periodically discharged from the system.
一方、高温炉の燃焼排ガスは、熱回収された後、ボイラ
排ガス系統へ投入して更に熱回収することができる。On the other hand, after the combustion exhaust gas of the high temperature furnace has been heat recovered, it can be input into the boiler exhaust gas system for further heat recovery.
第１図は本発明の一実施例を示す石炭焚ボイラの流れ系
統である。第１図において、前記第２図により説明した
従来のものと同様の部分については、第２図中で用いた
符号の数字に２０を加算した数字を符号として付け、詳
しい説明を省く。FIG. 1 is a flow system of a coal-fired boiler showing one embodiment of the present invention. In FIG. 1, the same parts as those of the conventional device explained in FIG. 2 are designated by numbers obtained by adding 20 to the reference numerals used in FIG. 2, and detailed explanation thereof will be omitted.
本実施例においては、ホッパ（２６） 、 （２Ｂ）お
よび電気集塵器（３０）で捕集されたフライアッシュは
、破線で示されるように、水冷壁で構成された高温炉（
３５）へ供給される。一方高温炉（３５）への燃料とし
ては、石炭粉砕ミル（２２）から微粉炭を一点鎖線で示
されるように分岐供給する。また酸素あるいは酸素富化
空気が、押込通風機（３２）の空気と酸素供給設備（４
１〉の酸素とを混合して供給される。その際、制御弁（
４０）によって、高温炉（３５）で必要な燃焼温度を得
るための酸素濃度に調整される。In this example, the fly ash collected in the hoppers (26), (2B) and the electrostatic precipitator (30) is transported to a high-temperature furnace (
35). On the other hand, as fuel to the high temperature furnace (35), pulverized coal is branched and supplied from the coal crushing mill (22) as shown by the dashed line. In addition, oxygen or oxygen-enriched air is mixed with the air of the forced draft fan (32) and the oxygen supply equipment (4).
1> is mixed with oxygen and supplied. At that time, control valve (
40), the oxygen concentration is adjusted to obtain the required combustion temperature in the high temperature furnace (35).
高温炉（３５）でフライアッシュは溶融して溶融スラグ
となり、高温炉壁を流下して炉底に開口した開口部から
落下する。そして下部の水チャンバ（３６）で急冷水砕
され、粒状の水砕スラグ（４２）となる。この粒状水砕
スラグは定期的に系外へ排出される。In the high-temperature furnace (35), the fly ash is melted into molten slag, which flows down the high-temperature furnace wall and falls from an opening in the bottom of the furnace. Then, it is rapidly cooled and pulverized in a lower water chamber (36) to become granular granulated slag (42). This granular granulated slag is periodically discharged from the system.
一方高温炉（３５）で燃焼した排ガスは、熱交換器（３
７）で熱回収した後、排ガス系統（３８）を経由して脱
硝装置（２７）の上流ダクトへ投入される。そして、ボ
イラ（２４）の排ガスとともに下流側各種機器を経由し
て煙突（３４）から排気される。On the other hand, the exhaust gas burned in the high temperature furnace (35) is transferred to the heat exchanger (3
After the heat is recovered in step 7), it is introduced into the upstream duct of the denitrification device (27) via the exhaust gas system (38). The exhaust gas from the boiler (24) is then exhausted from the chimney (34) via various devices on the downstream side.
上記のように本実施例では、フライアッシュを溶融スラ
グ化するので、未燃分の低減と溶質成分の除去ができ、
石炭灰処分に当って排水管理が不要となる。また、水砕
スラグは嵩比重が１．５〜２．０であり、フライアッシ
ュの嵩比重の約１７３となるので、処理容量が小さくな
り、処理費が低減するとともに、灰捨場を延命できる。As mentioned above, in this example, fly ash is turned into molten slag, so it is possible to reduce unburned content and remove solute components.
Drainage management is not required when disposing of coal ash. In addition, granulated slag has a bulk specific gravity of 1.5 to 2.0, which is about 173, which is the bulk specific gravity of fly ash, so the processing capacity is reduced, processing costs are reduced, and the life of the ash dump can be extended.
更に、ボイラからの灰排出が１か所に集約されるので、
灰処理系統が簡単となる。Furthermore, since the ash discharge from the boiler is concentrated in one place,
The ash treatment system becomes simple.
なお、ボイラ（２４）の排ガスダクト部にルーバ式集塵
器（３９）を設置することにより、石炭排ガス中のフラ
イアッシュを効果的に捕集することもできる。In addition, fly ash in coal exhaust gas can be effectively collected by installing a louver dust collector (39) in the exhaust gas duct of the boiler (24).
（発明の効果〕 本発明により下記の効果が得られる。(Effect of the invention〕 The present invention provides the following effects.
１） フライアッシュを溶融スラグ化することにより、
未燃分の低減と溶質成分の除去ができ、石炭灰処分に当
って排水管理が不要となる。1) By turning fly ash into molten slag,
It is possible to reduce unburned content and remove solute components, eliminating the need for wastewater management when disposing of coal ash.
２） 水砕スラグは嵩比重が１．５〜２．０でフライア
ッシュのそれの約１７３となるので、処理容量が小さく
なり、処理費が低減するとともに、灰捨場を延命できる
。2) Since granulated slag has a bulk specific gravity of 1.5 to 2.0, which is about 173 that of fly ash, the processing capacity is reduced, processing costs are reduced, and the life of the ash dump can be extended.
第１図は本発明の一実施例を示す石炭焚ボイラの流れ系
統図、第２図は従来の石炭焚ボイラの一例を示す流れ系
統図である。
（０１） 、 （２１）・・・石炭バンカ、（０２）
、 （２２）・・・石炭粉砕ミル、（０３） 、 （２
３＞・・・押込通風機、（０４） 、 （２４）・・・
ボイラ、（０５） 、 （２５）・・・バーナ風箱、（
０６） 、 （２６）・・・アッシュホッパ、（０７）
、 （２７）・・・脱硝装置、（０８） 、 （２８
）・・・アッシュホッパ、（０９） 、 （２９＞・・
・エアヒータ、（１０） 、 （３０）・・・電気集塵
器、（１１）、（３１）・・・脱硫装置、
（１２） 、 （３２）・・・燃焼用空気押込通風機、
（１３、（３３）・・・誘引通風機、（１４） 、 （
３４）・・・煙突、（３５・・・高温炉、 （３
６）・・・水チャンバ、（３７・・・排ガス熱交換器、
（３８・・・高温炉排ガス系統、
（３９・・・ルーバー式集塵器、（４０）・・・調整弁
、（４１）・・・酸素タンク、 （４２）・・・水
砕スラグ。FIG. 1 is a flow system diagram of a coal-fired boiler showing an embodiment of the present invention, and FIG. 2 is a flow system diagram showing an example of a conventional coal-fired boiler. (01), (21)...Coal bunker, (02)
, (22)...Coal crushing mill, (03) , (2
3>... Forced ventilation fan, (04), (24)...
Boiler, (05), (25)... Burner style box, (
06), (26)...Ash hopper, (07)
, (27)... Denitration equipment, (08) , (28
)...Ash hopper, (09), (29>...
・Air heater, (10), (30)...electrostatic precipitator, (11), (31)...desulfurization device, (12), (32)...combustion air forced draft fan,
(13, (33)...induced draft fan, (14), (
34)... Chimney, (35... High temperature furnace, (3
6)...Water chamber, (37...Exhaust gas heat exchanger, (38...High temperature furnace exhaust gas system, (39...Louvred dust collector, (40)...Adjusting valve, (41) )...Oxygen tank, (42)...Granulated slag.
Claims (1)
る石炭灰を、石炭が酸素または酸素富化空気により燃焼
する高温炉に供給して溶融させた後、水中で急冷して水
砕スラグとすることを特徴とする石炭焚ボイラの灰処理
方法。Coal ash separated and collected from the combustion exhaust gas of coal-fired boilers is fed to a high-temperature furnace where coal is burned in oxygen or oxygen-enriched air, where it is melted, and then rapidly cooled in water to form granulated slag. A coal-fired boiler ash processing method characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4566590A JP2680714B2 (en) | 1990-02-28 | 1990-02-28 | Ash treatment method for coal-fired boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4566590A JP2680714B2 (en) | 1990-02-28 | 1990-02-28 | Ash treatment method for coal-fired boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03252337A true JPH03252337A (en) | 1991-11-11 |
| JP2680714B2 JP2680714B2 (en) | 1997-11-19 |
Family
ID=12725684
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4566590A Expired - Fee Related JP2680714B2 (en) | 1990-02-28 | 1990-02-28 | Ash treatment method for coal-fired boiler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2680714B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110195133B (en) * | 2019-07-12 | 2021-03-23 | 河北科技大学 | Converter slag treatment system and treatment method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6433415A (en) * | 1987-07-27 | 1989-02-03 | Kobe Steel Ltd | Disposal method for disposal waste and disposer for ash of incinerated disposal waste |
-
1990
- 1990-02-28 JP JP4566590A patent/JP2680714B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6433415A (en) * | 1987-07-27 | 1989-02-03 | Kobe Steel Ltd | Disposal method for disposal waste and disposer for ash of incinerated disposal waste |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2680714B2 (en) | 1997-11-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |