JPH0663193B2 - Fluidized bed recovery boiler using alkaline pulp waste liquid as fuel - Google Patents
Fluidized bed recovery boiler using alkaline pulp waste liquid as fuelInfo
- Publication number
- JPH0663193B2 JPH0663193B2 JP1647786A JP1647786A JPH0663193B2 JP H0663193 B2 JPH0663193 B2 JP H0663193B2 JP 1647786 A JP1647786 A JP 1647786A JP 1647786 A JP1647786 A JP 1647786A JP H0663193 B2 JPH0663193 B2 JP H0663193B2
- Authority
- JP
- Japan
- Prior art keywords
- fluidized bed
- fluidized
- alkaline
- waste liquid
- recovery boiler
- 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
- Paper (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、木材繊維、非木材繊維のアルカリ蒸解工程お
よび／またはこの繊維のアルカリ蒸解工程に引き続く漂
白工程から排出される黒液と称される実質的に硫黄化合
物を含まない含水アルカリ性廃液を、Fe２Ｏ３を流動媒
体および苛性化剤とする流動床炉に導入して燃焼・反応
させ、炉内で鉄酸ソーダ（Na２Fe２Ｏ４）を生成させ、
その反応生成物を加水分解して苛性ソーダを回収する流
動床回収ボイラに関するものである。またアルカリパル
プ廃液以外にも、カプロラクタム廃液にも適用できる流
動床回収ボイラに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention refers to black liquor discharged from an alkaline cooking process of wood fibers and non-wood fibers and / or a bleaching process subsequent to the alkaline cooking process of these fibers. The hydrous alkaline waste liquid containing substantially no sulfur compound is introduced into a fluidized bed furnace using Fe 2 O 3 as a fluid medium and a causticizing agent, and is burned and reacted, so that sodium ferrate (Na 2 Fe 2 O 4 ) is generated,
The present invention relates to a fluidized bed recovery boiler that hydrolyzes the reaction product to recover caustic soda. Further, the present invention relates to a fluidized bed recovery boiler applicable to not only alkaline pulp waste liquid but also caprolactam waste liquid.
従来、クラフトパルプ法（KP法）での木材繊維の蒸解工
程から排出される黒液を濃縮して回収ボイラ炉内で還元
燃焼させ、Na２Ｓ、Na２CO３などの薬品を溶融状態で回
収し、それを苛性化工程において苛性ソーダとして回収
する方法として、石灰が実用化されている。Conventionally, the black liquor discharged from the wood fiber cooking process by the kraft pulp method (KP method) is concentrated and reduced and burned in a recovery boiler furnace, and chemicals such as Na 2 S and Na 2 CO 3 are melted. As a method of recovering and recovering it as caustic soda in the causticizing step, lime has been put into practical use.
しかしこの石灰法においては、工程が複雑であること、
生石灰の再生にキルンを必要とし重油を用いること、さ
らには黒液中に硫黄化合物を含むので、臭気対策および
装置の腐食対策などが必要であつた。However, in this lime method, the process is complicated,
A kiln was required to regenerate the quicklime, heavy oil was used, and black liquor contained sulfur compounds, so it was necessary to take measures against odor and corrosion of the equipment.
これらの欠点を解消するために、回収ボイラ炉内で硫黄
化合物を含まない黒液と苛性化剤を燃焼・反応させ、反
応生成物を温水抽出して直接パルプ蒸解薬品とする苛性
ソーダ液を回収し、沈殿した苛性化剤を乾燥した後、回
収ボイラへ循環再使用する直接苛性化法が提案されてい
る。In order to eliminate these drawbacks, the black liquor that does not contain sulfur compounds and the causticizing agent are burned and reacted in the recovery boiler furnace, and the reaction product is extracted with hot water to recover the caustic soda solution that is directly used as pulp cooking chemicals. A direct causticizing method has been proposed in which the precipitated causticizing agent is dried and then recycled to a recovery boiler.
しかし上記の直接苛性化法においては、流動媒体および
苛性化剤としてFe２Ｏ３を使用し、アルカリパルプ廃液
と燃焼・反応させてNa２Fe２Ｏ４を生成させる非冷水方
式の耐火材構造の反応炉、および反応炉からの排ガスの
顕熱を利用して蒸気を発生させる、いわゆる廃熱ボイラ
との組合わせから構成されている。このように反応炉と
廃熱ボイラとに分離されているので、運転操作上、複雑
であり、かつ反応炉が耐火材構造であるので、保守点検
および炉材の補修費が水冷壁構造の回収ボイラに比べて
余分にかかるなどの問題点がある。However, in the above-mentioned direct causticizing method, Fe 2 O 3 is used as a fluidizing medium and causticizing agent, and a non-cold water type refractory structure for producing Na 2 Fe 2 O 4 by burning and reacting with alkali pulp waste liquid. And a so-called waste heat boiler that generates steam by utilizing the sensible heat of the exhaust gas from the reaction furnace. Since the reactor is separated from the waste heat boiler in this way, it is complicated in terms of operation, and because the reactor has a refractory structure, maintenance and inspection costs and repair costs for the furnace material are recovered by the water-cooled wall structure. There is a problem that it costs extra compared to the boiler.
また上記の直接苛性化法において、黒液を流動層に給す
る場合、流動層の上方に黒液スプレイノズルを設け、こ
の黒液スプレイノズルを上下に駆動させて炉底にチヤー
ベツドを形成させたり、または∞の字状に駆動させて黒
液粒子を周壁に衝突させて堆積させたりする方式が提案
されている。Further, in the above-mentioned direct causticizing method, when black liquor is supplied to the fluidized bed, a black liquor spray nozzle is provided above the fluidized bed, and the black liquor spray nozzle is driven up and down to form a chebed in the furnace bottom. A method has been proposed in which black liquor particles are caused to collide with the peripheral wall to be deposited by being driven in the shape of an arrow or an infinity.
しかしながら、上下駆動方式では黒液粒子、ダストの飛
散が激しいという問題点があり、また∞の字駆動方式で
は周壁水冷壁が損傷し、黒液堆積物落下時に炉内圧が変
動するなどの問題点がある。However, the vertical drive method has a problem that black liquor particles and dust are heavily scattered, and the ∞ drive method has a problem that the peripheral water cooling wall is damaged and the furnace pressure fluctuates when the black liquor deposit falls. There is.
本発明は上記の諸点に鑑みなされたもので、黒液を効率
よく流動層内へ供給することができ、かつボイラ効率の
良好なアルカリパルプ廃液を燃料とする流動床回収ボイ
ラの提供を目的とするものである。The present invention has been made in view of the above points, and an object of the present invention is to provide a fluidized bed recovery boiler that can efficiently supply black liquor into a fluidized bed, and uses alkaline pulp waste liquid with good boiler efficiency as a fuel. To do.
本発明の装置は、図面を参照して説明すれば、木材繊
維、非木材繊維のアルカリ蒸解工程および／またはこの
アルカリ蒸解工程に引き続く漂白工程から排出されるア
ルカリ性廃液を、濃縮装置によつて濃縮した後、酸化鉄
を流動媒体および苛性化剤とする流動床炉１に導入して
燃焼させる流動床回収ボイラにおいて、 流動床炉１内の流動層７の上側に、下面に複数の孔11を
有し、円周方向に回動可能なアルカリ性廃液スプレイノ
ズル12を設けたことを特徴としている。The apparatus of the present invention will be described with reference to the drawings, in which an alkaline waste liquid discharged from an alkaline digestion process of wood fibers and non-wood fibers and / or a bleaching process subsequent to this alkaline digestion process is concentrated by a concentrating device. After that, in the fluidized bed recovery boiler in which iron oxide is introduced into the fluidized bed furnace 1 using the fluidized medium and the causticizing agent and burned, a plurality of holes 11 are formed on the lower surface above the fluidized bed 7 in the fluidized bed furnace 1. It is characterized in that it has an alkaline waste liquid spray nozzle 12 which is rotatable in the circumferential direction.
また本発明の装置は、流動床炉１内の流動層７の上側
に、下面に複数の孔11を有し、円周方向に回動可能なア
ルカリ性廃液スプレイノズル12を設け、さらに流動床炉
１が水冷壁管14で構成され、流動床炉１の底部および炉
底周辺部が耐火材層15で被覆されたことを特徴としてい
る。Further, the apparatus of the present invention is provided with a plurality of holes 11 on the lower surface above the fluidized bed 7 in the fluidized bed furnace 1, an alkaline waste liquid spray nozzle 12 rotatable in the circumferential direction, and further a fluidized bed furnace. 1 is composed of a water cooling wall tube 14, and the bottom of the fluidized bed furnace 1 and the peripheral area of the furnace bottom are covered with a refractory material layer 15.
アルカリ性廃液スプレイノズル12を往復回動させること
により、黒液は下向きに広がつて噴射され、流動媒体お
よび苛性化剤が沸騰状態のように流動している流動層７
内に入り込んで効率よく燃焼および反応が行われる。By rotating the alkaline waste liquid spray nozzle 12 back and forth, the black liquor is sprayed downwardly and widely, and the fluidized medium and the causticizing agent are fluidized like a boiling state.
It enters the inside and burns and reacts efficiently.
以下、本発明の実施例を第１図〜第５図に基づいて説明
する。第１図は本発明の装置の一例を示している。１は
流動床炉、２は蒸気ドラム、３は水ドラム、４は節炭器
である。流動床炉１の底部には風箱５が設けられ、この
風箱５の上側に空気分散板ノズルが設けられている。こ
の空気分散ノズル６の上側に、Fe２Ｏ３からなる流動層
７が形成され、この流動層７内に伝熱管８が設けられて
いる。この流動層７の上側に、第２図に示すように、下
面に複数の孔11を有し、円周方向に回動可能なアルカリ
性廃液（黒液）スプレイノズル12が設けられている。13
はスプレイノズル駆動装置である。スプレイノズル12は
２重管構造に形成され、外側の管に水を流して過熱防止
を図るようになつている。An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows an example of the device of the present invention. 1 is a fluidized bed furnace, 2 is a steam drum, 3 is a water drum, and 4 is a economizer. An air box 5 is provided at the bottom of the fluidized bed furnace 1, and an air dispersion plate nozzle is provided above the air box 5. A fluidized bed 7 made of Fe 2 O 3 is formed above the air dispersion nozzle 6, and a heat transfer tube 8 is provided in the fluidized bed 7. As shown in FIG. 2, an alkaline waste liquid (black liquor) spray nozzle 12 having a plurality of holes 11 on the lower surface and rotatable in the circumferential direction is provided above the fluidized bed 7. 13
Is a spray nozzle drive device. The spray nozzle 12 is formed in a double pipe structure, and water is made to flow through the outer pipe to prevent overheating.
また第３図〜第５図に示すように、流動床炉１は水冷壁
管14で構成され、流動床炉１の底部および炉底周辺部は
耐火材層15で被覆されている。16は水管、17、18はフイ
ンである。Further, as shown in FIGS. 3 to 5, the fluidized bed furnace 1 is composed of a water cooling wall tube 14, and the bottom portion of the fluidized bed furnace 1 and the peripheral portion of the furnace bottom are covered with a refractory material layer 15. 16 is a water pipe, 17 and 18 are fins.
上記のような構成された装置において、スプレイノズル
12を矢印の方向に往復回動しつつ黒液を供給すると、黒
液は下向きに広がつて噴射され、Fe２Ｏ３を媒体とする
流動層内に入り込み効率よく燃焼・反応が行われる。応
生成物である鉄酸ソーダ（Na２Fe２Ｏ４）を水中に投入
して抽出水溶液として直接苛性ソーダを回収するととも
に、抽出残渣として得られたFe２Ｏ３を循環再使用す
る。これらの反応式はつぎの如くである。In the device configured as described above, a spray nozzle
When the black liquor is supplied while reciprocally rotating 12 in the direction of the arrow, the black liquor is spread and jetted downward, enters the fluidized bed using Fe 2 O 3 as a medium, and efficiently burns and reacts. Sodium ferrate (Na 2 Fe 2 O 4 ) as a reaction product is put into water to directly recover caustic soda as an extraction aqueous solution, and Fe 2 O 3 obtained as an extraction residue is reused by circulation. These reaction formulas are as follows.
Na2CO3＋Fe2O3→Na2Fe2O4＋CO2 （１） Na2＋Fe2O3→Na2Fe2O4 （２） Na2Fe2O4＋H2O→2NaOH＋Fe2O3 （３） 〔発明の効果〕 本発明は上記のように構成されているので、第１の発明
においては、黒液を効率よく流動層内へ供給することが
でき、第２の発明においては、第１の発明における効果
に加えて、ボイラ効率をよくすることができ、かつ運転
操作、保守点検が容易で、しかも補修費が少なくなるな
どの効果を奏する。Na 2 CO 3 + Fe 2 O 3 → Na 2 Fe 2 O 4 + CO 2 (1) Na 2 + Fe 2 O 3 → Na 2 Fe 2 O 4 (2) Na 2 Fe 2 O 4 + H 2 O → 2NaOH + Fe 2 O 3 (3) [Effects of the Invention] Since the present invention is configured as described above, in the first invention, black liquor can be efficiently supplied into the fluidized bed, and in the second invention, In addition to the effects of the first invention, the boiler efficiency can be improved, the operation and maintenance inspection can be easily performed, and the repair cost can be reduced.
第１図は本発明のアルカリパルプ廃液を燃料とする流動
床回収ボイラの一例を示す説明図、第２図は本発明装置
におけるアルカリ性廃液スプレイノズルまわりの側面
図、第３図は本発明装置における流動床炉の説明図、第
４図は水冷壁管の横断面図、第５図は炉底周辺部の横断
面図である。 １……流動床炉、２……蒸気ドラム、３……水ドラム、
４……節炭器、５……風箱、６……空気分散ノズル、７
……流動層、８……伝熱管、11……孔、12……スプレイ
ノズル、13……駆動装置、14……水冷壁管、15……耐火
材層、16……水管、17、18……フインFIG. 1 is an explanatory view showing an example of a fluidized bed recovery boiler using the alkaline pulp waste liquid of the present invention as a fuel, FIG. 2 is a side view around an alkaline waste liquid spray nozzle in the device of the present invention, and FIG. 3 is a diagram of the device of the present invention. FIG. 4 is an explanatory view of a fluidized bed furnace, FIG. 4 is a cross-sectional view of a water cooling wall tube, and FIG. 5 is a cross-sectional view of a peripheral portion of the furnace bottom. 1 ... Fluidized bed furnace, 2 ... Steam drum, 3 ... Water drum,
4 ... economizer, 5 ... wind box, 6 ... air dispersion nozzle, 7
...... Fluidized bed, 8 ...... Heat transfer tube, 11 …… Hole, 12 …… Spray nozzle, 13 …… Drive device, 14 …… Water cooling wall tube, 15 …… Refractory layer, 16 …… Water tube, 17, 18 ...... Fin
Claims (2)
および／またはこのアルカリ蒸解工程に引き続く漂白工
程から排出されるアルカリ性廃液を、濃縮装置によつて
濃縮した後、酸化鉄を流動媒体および苛性化剤とする流
動床炉に導入して燃焼させる流動床回収ボイラにおい
て、 流動床炉内の流動層の上側に、下面に複数の孔を有し、
円周方向に回動可能なアルカリ性廃液スプレイノズルを
設けたことを特徴とするアルカリパルプ廃液を燃料とす
る流動床回収ボイラ。1. An alkaline waste liquor discharged from an alkaline digestion step of wood fibers and non-wood fibers and / or a bleaching step subsequent to this alkaline digestion step is concentrated by a concentrating device, and then iron oxide is mixed with a fluid medium and caustic. In a fluidized-bed recovery boiler that is introduced into a fluidized-bed furnace as an agent and burned, a plurality of holes are formed in the lower surface above the fluidized bed in the fluidized-bed furnace,
A fluidized bed recovery boiler using alkaline pulp waste liquid as a fuel, which is provided with an alkaline waste liquid spray nozzle rotatable in the circumferential direction.
および／またはこのアルカリ蒸解工程に引き続く漂白工
程から排出されるアルカリ性廃液を、濃縮装置によつて
濃縮した後、酸化鉄を流動媒体および苛性化剤とする流
動床炉に導入して燃焼させる流動床回収ボイラにおい
て、 流動床炉内の流動層の上側に、下面に複数の孔を有し、
円周方向に回動可能なアルカリ性廃液スプレイノズルを
設け、 さらに流動床炉が水冷壁管で構成され、流動床炉の底部
および炉底周辺部が耐火材層で被覆されたことを特徴と
するアルカリパルプ廃液を燃料とする流動床回収ボイ
ラ。2. An alkaline waste liquid discharged from an alkaline digestion step of wood fibers and non-wood fibers and / or a bleaching step subsequent to this alkaline digestion step is concentrated by a concentrating device, and then iron oxide is mixed with a fluid medium and caustic. In a fluidized-bed recovery boiler that is introduced into a fluidized-bed furnace as an agent and burned, a plurality of holes are formed in the lower surface above the fluidized bed in the fluidized-bed furnace,
It is characterized in that an alkaline waste liquid spray nozzle rotatable in the circumferential direction is provided, the fluidized bed furnace is composed of a water cooling wall tube, and the bottom of the fluidized bed furnace and the peripheral area of the furnace bottom are covered with a refractory material layer. Fluidized bed recovery boiler that uses alkaline pulp waste liquid as fuel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1647786A JPH0663193B2 (en) | 1986-01-28 | 1986-01-28 | Fluidized bed recovery boiler using alkaline pulp waste liquid as fuel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1647786A JPH0663193B2 (en) | 1986-01-28 | 1986-01-28 | Fluidized bed recovery boiler using alkaline pulp waste liquid as fuel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62175509A JPS62175509A (en) | 1987-08-01 |
| JPH0663193B2 true JPH0663193B2 (en) | 1994-08-17 |
Family
ID=11917357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1647786A Expired - Fee Related JPH0663193B2 (en) | 1986-01-28 | 1986-01-28 | Fluidized bed recovery boiler using alkaline pulp waste liquid as fuel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0663193B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114673996B (en) * | 2022-03-01 | 2025-07-18 | 武汉凯比思电力设备有限公司 | Automatic coke cleaning and spray angle automatic control device for black liquor spray gun of alkaline furnace |
-
1986
- 1986-01-28 JP JP1647786A patent/JPH0663193B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62175509A (en) | 1987-08-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |