JPH0223634B2 - - Google Patents
Info
- Publication number
- JPH0223634B2 JPH0223634B2 JP56031756A JP3175681A JPH0223634B2 JP H0223634 B2 JPH0223634 B2 JP H0223634B2 JP 56031756 A JP56031756 A JP 56031756A JP 3175681 A JP3175681 A JP 3175681A JP H0223634 B2 JPH0223634 B2 JP H0223634B2
- Authority
- JP
- Japan
- Prior art keywords
- waste liquid
- combustion
- pulp
- pulp waste
- burned
- 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
- 238000002485 combustion reaction Methods 0.000 claims description 43
- 239000007788 liquid Substances 0.000 claims description 41
- 239000002699 waste material Substances 0.000 claims description 41
- 238000000034 method Methods 0.000 claims description 22
- 238000011084 recovery Methods 0.000 claims description 20
- 239000000126 substance Substances 0.000 claims description 17
- 238000010411 cooking Methods 0.000 claims description 15
- 239000008187 granular material Substances 0.000 claims description 13
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 11
- 230000002829 reductive effect Effects 0.000 claims description 11
- 239000002655 kraft paper Substances 0.000 claims description 9
- 239000005416 organic matter Substances 0.000 claims description 7
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 5
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 4
- 235000011152 sodium sulphate Nutrition 0.000 claims description 4
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 239000011734 sodium Substances 0.000 description 14
- 238000001035 drying Methods 0.000 description 12
- 241001062472 Stokellia anisodon Species 0.000 description 7
- 239000000428 dust Substances 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- 238000006722 reduction reaction Methods 0.000 description 4
- 229910052979 sodium sulfide Inorganic materials 0.000 description 4
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- VDQVEACBQKUUSU-UHFFFAOYSA-M disodium;sulfanide Chemical compound [Na+].[Na+].[SH-] VDQVEACBQKUUSU-UHFFFAOYSA-M 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005469 granulation Methods 0.000 description 3
- 230000003179 granulation Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004108 freeze drying Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000010446 mirabilite Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000002023 wood Substances 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、パルプ蒸解廃液（黒液ともいう）を
乾燥、固形化した後、造粒し、回収ボイラで燃焼
させることにより、パルプ蒸解廃液を効率よくか
つ経済的に処理し、蒸解薬品を効率よく回収する
ことができる、クラフトパルプ法（KP法）にお
けるパルプ廃液の処理方法に関するものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a method of drying and solidifying pulp cooking waste liquid (also referred to as black liquor), granulating it, and burning it in a recovery boiler. The present invention relates to a method for treating pulp waste liquid in the kraft pulp process (KP process), which enables efficient and economical treatment of cooking chemicals and efficient recovery of cooking chemicals.
従来、クラフトパルプ法において、木材チツプ
を蒸解したときに発生するパルプ蒸解廃液（以
下、パルプ廃液という）は、濃縮されて回収ボイ
ラで燃焼され、蒸解薬品および水蒸気が回収され
ている。すなわち第１図に示すように、真空蒸発
缶で60〜70重量％の濃度に濃縮されたパルプ廃液
を、パルプ廃液タンク１に一旦溜めた後、輸送ポ
ンプ２でスプレーガン３のような噴霧装置に送
り、燃焼室４に噴霧して水分を乾燥させるととも
に、蒸解中に溶出した有機物を燃焼させて水蒸気
を発生させ、かつパルプ廃液に含有されている無
機物中の薬品を、スメルトとして回収している。
クラフトパルプ廃液中の炭酸ソーダは、そのまま
で硫酸ソーダ（Na2SO4）を硫化ソーダ（Na2S）
に還元し、スメルトとして回収している。５はス
メルト排出口、６は過熱器、７はボイラ本体、８
はエコノマイザ、１０は燃焼排ガスダクトであ
る。
Conventionally, in the kraft pulp process, pulp cooking waste liquid (hereinafter referred to as pulp waste liquid) generated when wood chips are digested is concentrated and burned in a recovery boiler to recover cooking chemicals and water vapor. That is, as shown in FIG. 1, pulp waste liquid concentrated to a concentration of 60 to 70% by weight in a vacuum evaporator is temporarily stored in a pulp waste liquid tank 1, and then is transferred to a spray device such as a spray gun 3 using a transport pump 2. In addition to spraying it into the combustion chamber 4 to dry the moisture, the organic matter eluted during cooking is burned to generate steam, and the chemicals in the inorganic matter contained in the pulp waste liquid are recovered as smelt. There is.
Sodium carbonate in kraft pulp waste liquid is converted into sodium sulfate (Na 2 SO 4 ) and sodium sulfide (Na 2 S).
and recovered as smelt. 5 is the smelt discharge port, 6 is the superheater, 7 is the boiler body, 8
is an economizer, and 10 is a combustion exhaust gas duct.
また、特開昭48−88773号公報には、パルプ廃
液を三重効用缶で濃縮した後、加圧ノズル式噴霧
乾燥装置４で乾燥・粉末化し、燃焼炉８で燃焼処
理する装置が記載されており、特開昭49−2901号
公報には、濃縮黒液を乾燥器１２に供給し、熱ガ
スより加熱・乾燥させて炭素含有乾燥廃液固体と
した後、酸化炉１９内で燃焼させる方法及び装置
が記載されている。 Furthermore, JP-A-48-88773 describes an apparatus in which pulp waste liquid is concentrated in a triple-effect can, dried and powdered in a pressurized nozzle spray dryer 4, and then combusted in a combustion furnace 8. JP-A No. 49-2901 discloses a method of supplying concentrated black liquor to a dryer 12, heating and drying it with hot gas to form a carbon-containing dry waste liquid solid, and then burning it in an oxidizing furnace 19. The equipment is described.
上記のようにパルプ廃液は30〜40重量％の水分
を含んでいるので、液体としてポンプ輸送が可能
である反面、水分乾燥のため多量の熱が奪われ、
発生水蒸気量が少なくなるとともに、蒸解薬品を
回収する場合、均一な還元反応を行わせることが
難しく、また水分を蒸発させるために燃焼室内に
おいて燃焼ガスと接触させる乾燥ゾーンが必要で
あるので、燃焼室が大型化するなどの不都合点が
あつた。
As mentioned above, pulp waste liquid contains 30 to 40% water by weight, so while it can be transported by pump as a liquid, a large amount of heat is lost due to drying of the water.
In addition to reducing the amount of water vapor generated, it is difficult to perform a uniform reduction reaction when recovering cooking chemicals, and a drying zone is required in the combustion chamber to contact combustion gas in order to evaporate water. There were some disadvantages, such as the room becoming larger.
また、上記の特開昭48−88773号公報、特開昭
49−2901号に示されるように、パルプ廃液を乾燥
し、粉末状にしたものを直接燃焼室に投入する
と、酸化燃焼し、回収ボイラの役割の一つである
薬品（Na2S）回収ができなくなり、少なくとも
KP法（クラフトパルプ法）のパルプ製造システ
ムとして成立しない。また、燃焼室に投入された
乾燥物が粉末状になつて、燃焼排ガス流により上
方に飛散するので、薬品回収率が低くなるという
不都合がある。 In addition, the above-mentioned Japanese Patent Application Publication No. 48-88773,
As shown in No. 49-2901, when pulp waste liquid is dried and powdered and directly fed into the combustion chamber, it undergoes oxidative combustion and recovers chemicals (Na 2 S), which is one of the roles of the recovery boiler. At least
The KP method (kraft pulp method) cannot be used as a pulp manufacturing system. Further, the dry matter introduced into the combustion chamber becomes powder and is scattered upward by the combustion exhaust gas flow, resulting in a disadvantage that the chemical recovery rate becomes low.
クラフトパルプ法における回収ボイラの役割と
して、つぎの２つがある。 The recovery boiler has the following two roles in the kraft pulp process.
(1) パルプ廃液中の有機物の燃焼物を利用して水
蒸気を発生させる。(1) Steam is generated using the combustion of organic matter in pulp waste liquid.
(2) パルプ廃液中のソーダ分を燃焼により有機物
と分離し、回収するとともに、芒硝を硫化ソー
ダに還元する。(2) The soda content in the pulp waste liquid is separated from organic matter by combustion and recovered, and the mirabilite is reduced to sodium sulfide.
Na2SO4＋4C→Na2S＋4CO
Na2SO4＋2C→Na2S＋2CO2
すなわち、クラフトパルプ法の蒸解薬品である
NaOH＋Na2Sの内、Na2Sは、回収ボイラ内で
Na2SO4を還元燃焼することによつて得られ、リ
サイクルしている。Na 2 SO 4 +4C→Na 2 S+4CO Na 2 SO 4 +2C→Na 2 S+2CO 2 In other words, it is a cooking chemical for the kraft pulp process.
Of NaOH + Na 2 S, Na 2 S is recovered in the recovery boiler.
It is obtained by reducing and burning Na 2 SO 4 and is recycled.
還元燃焼させるためには、乾燥廃液をある大き
さ以上の粒度にし、炉床で燠燃焼させることが必
要で、粉末状のまま炉内に投入すると、浮遊燃焼
（酸化燃焼）となり、芒硝（Na2SO4）を硫化ソ
ーダ（Na2S）に還元することができなくなる。 In order to perform reductive combustion, it is necessary to reduce the particle size of the dry waste liquid to a certain size or higher and scorch it in a hearth. 2 SO 4 ) can no longer be reduced to sodium sulfide (Na 2 S).
本発明は上記の諸点に鑑みなされたもので、パ
ルプ廃液を予め乾燥、固形化した後、造粒し、こ
の廃液造粒物をスプレツダなどで回収ボイラの燃
焼室に導入、散布して燃焼させることにより、水
分蒸発のための乾燥ゾーンが不要となつて燃焼室
を小型化することができ、かつ水分蒸発のための
エネルギを高圧水蒸気として取り出して省エネル
ギ化を図ることができるとともに、蒸解薬品回収
のための還元率を高めることができるパルプ廃液
の処理方法を提供することを目的とするものであ
る。 The present invention has been made in view of the above points, and the pulp waste liquid is dried and solidified in advance, and then granulated, and the waste liquid granules are introduced into the combustion chamber of a recovery boiler using a spreader, etc., and are spread and combusted. This eliminates the need for a drying zone for water evaporation, making it possible to downsize the combustion chamber, extracting the energy for water evaporation as high-pressure steam, and saving energy. It is an object of the present invention to provide a method for treating pulp waste liquid that can increase the reduction rate for recovery.
上記の目的を達成するために、本発明のパルプ
廃液の処理方法は、パルプ廃液を回収ボイラで燃
焼させて蒸解薬品および水蒸気を回収するクラフ
トパルプ法におけるパルプ廃液の処理方法におい
て、パルプ廃液を予め乾燥、固形化した後、造粒
し、この廃液造粒物を回収ボイラに散布して、造
粒物のうち、有機物は炉床部の還元雰囲気での還
元燃焼から、さらに炉内上部に移り酸化燃焼させ
るとともに、無機物中の硫酸ソーダは、炉床部の
還元雰囲気で燃焼させ、溶融状の硫化ソーダを炉
底部から蒸解薬品として回収するようにしたもの
である。
In order to achieve the above object, the pulp waste liquid treatment method of the present invention is a pulp waste liquid treatment method in the kraft pulp method in which the pulp waste liquid is burned in a recovery boiler to recover cooking chemicals and steam. After drying and solidifying, it is granulated, and the waste liquid granules are dispersed into a recovery boiler, and the organic matter in the granules is transferred to the upper part of the furnace through reductive combustion in the reducing atmosphere of the hearth. In addition to oxidative combustion, the sodium sulfate in the inorganic material is combusted in a reducing atmosphere in the hearth, and molten sodium sulfide is recovered from the bottom of the furnace as a cooking chemical.
パルプ廃液の乾燥・固形化・造粒物は、回収ボ
イラの燃焼室内に散布され、造粒物のうち、有機
物は炉床部で還元燃焼され、無機物中の硫酸ソー
ダ（Na2SO4）は炉床部で硫化ソーダ（Na2S）
に効率よく還元燃焼されて、蒸解薬品として回収
される。燃焼排ガスは、過熱器、ボイラ本体、エ
コノマイザと順次熱交換して、水蒸気発生の熱源
となる。
The dried, solidified, and granulated pulp waste liquid is scattered into the combustion chamber of a recovery boiler. Among the granulated materials, organic matter is reduced and burned in the hearth, and sodium sulfate (Na 2 SO 4 ) in the inorganic matter is Sodium sulfide ( Na2S ) in the hearth
It is efficiently reduced and burned and recovered as cooking chemicals. The combustion exhaust gas sequentially exchanges heat with the superheater, boiler body, and economizer, and becomes a heat source for steam generation.
以下、本発明の実施例を図面に基づいて説明す
る。第２図は本発明の方法を実施する装置の一例
を示している。１は真空蒸発缶で濃縮されたパル
プ廃液を一旦溜めるためのパルプ廃液タンクで、
このパルプ廃液タンク１は輸送ポンプ２を介して
凍結乾燥方式、フラツシユ乾燥方式などの乾燥・
固形化装置１１に接続されている。この乾燥・固
形化装置１１は、ペレタイザのような造粒装置１
６およびホツパ１２を介してスクリユーコンベア
１３などの搬送機の一端に接続され、この搬送機
の他端はスプレツダ１４を介して回収ボイラの燃
焼室１５に接続されている。燃焼室１５内の上部
には過熱器６が設けられ、この過熱器６の下流側
にはボイラ本体７、エコノマイザ８が配設されて
いる。５はスメルト排出口、１０は燃焼排ガスダ
クトである。
Embodiments of the present invention will be described below based on the drawings. FIG. 2 shows an example of an apparatus for carrying out the method of the invention. 1 is a pulp waste liquid tank for temporarily storing pulp waste liquid concentrated in a vacuum evaporator.
This pulp waste liquid tank 1 is used for drying, such as freeze drying or flash drying, via a transport pump 2.
It is connected to the solidification device 11. This drying/solidification device 11 includes a granulation device 1 such as a pelletizer.
6 and a hopper 12 to one end of a conveying machine such as a screw conveyor 13, and the other end of this conveying machine is connected through a spreader 14 to a combustion chamber 15 of a recovery boiler. A superheater 6 is provided in the upper part of the combustion chamber 15, and a boiler main body 7 and an economizer 8 are provided downstream of the superheater 6. 5 is a smelt discharge port, and 10 is a combustion exhaust gas duct.
上記のように構成された装置において、真空蒸
発缶（図示せず）で60〜70重量％の濃度に濃縮さ
れたパルプ廃液は一旦パルプ廃液タンク１に溜め
られた後、輸送ポンプ２で乾燥・固形化装置１１
に送られ、ここで脱水されて固形化物が得られ
る。この固形化物は造粒装置１６でペレツト状に
造粒された後、ホツパ１２に投入され、スクリユ
ーコンベア１３でスプレツダ１４に送られて、こ
のスプレツダ１４により燃焼室１５内に散布され
る。燃焼室１５内に散布された造粒物のうち、有
機物は炉床部の還元雰囲気での還元燃焼から、さ
らに炉内上部に移り酸化燃焼されるとともに、無
機物中の炭酸ソーダはそのままで、硫酸ソーダは
炉床部の還元雰囲気で硫化ソーダに還元燃焼さ
れ、この溶融状の硫化ソーダはスメルトとしてス
メルト排出口５から回収され、蒸解薬品として再
使用される。燃焼排ガスは過熱器６、ボイラ本体
７、エコノマイザ８と順次熱交換し燃焼排ガスダ
スト１０から排出される。 In the apparatus configured as described above, pulp waste liquid concentrated to a concentration of 60 to 70% by weight in a vacuum evaporator (not shown) is temporarily stored in a pulp waste liquid tank 1, and then dried and dried in a transport pump 2. Solidification device 11
The water is sent to the water tank, where it is dehydrated to obtain a solidified product. This solidified material is granulated into pellets by a granulator 16, then put into a hopper 12, sent to a screw conveyor 13 to a spreader 14, and spread into a combustion chamber 15 by the spreader 14. Among the granules scattered in the combustion chamber 15, the organic matter undergoes reductive combustion in the reducing atmosphere of the hearth, then moves to the upper part of the furnace and is oxidized and burned, while the sodium carbonate in the inorganic matter remains as it is and becomes sulfuric acid. The soda is reduced and burned to sodium sulfide in the reducing atmosphere of the hearth, and this molten soda sulfide is recovered as smelt from the smelt outlet 5 and reused as a cooking chemical. The combustion exhaust gas sequentially exchanges heat with the superheater 6, the boiler main body 7, and the economizer 8, and is discharged from the combustion exhaust gas dust 10.
なお造粒する場合に、有機性バインダを加える
こともある。造粒しない場合は、燃焼室１５内に
散布される固形化物が粉末状になる場合があり、
燃焼排ガス流により上方に飛散するので、硫化ソ
ーダ、炭酸ソーダの回収率が低くなる場合が生じ
るが、本発明の方法のように造粒する場合は、燃
焼室１５内にペレツトが散布されるので、散布さ
れたペレツトは下方に落下し、薬品たとえば硫化
ソーダ、炭酸ソーダの回収率が高くなるという利
点がある。 Note that when granulating, an organic binder may be added. If granulation is not performed, the solidified material dispersed into the combustion chamber 15 may become powdered,
Since they are scattered upward by the combustion exhaust gas flow, the recovery rate of soda sulfide and soda carbonate may be low, but when granulating as in the method of the present invention, the pellets are scattered inside the combustion chamber 15. The dispersed pellets fall downward, which has the advantage of increasing the recovery rate of chemicals such as sodium sulfide and soda carbonate.
本発明は上記のように構成されているから、下
記のような種々の効果を奏する。
Since the present invention is configured as described above, it has various effects as described below.
(1) 廃液造粒物中に水分がきわめて少ないので、
蒸発潜熱が奪われず持ち去り排ガス熱量が小さ
く、かつ排ガス量が少ないので排ガス損失が小
さくなり、このため熱効率が向上するととも
に、集じん機、フアンなどの容量を小さくで
き、イニシヤルコスト、ランニングコストとも
安くなり省資源、省エネルギに寄与する。(1) Since there is very little water in the waste liquid granules,
The latent heat of vaporization is not taken away and the amount of exhaust gas heat carried away is small, and the amount of exhaust gas is small, so the exhaust gas loss is reduced, which improves thermal efficiency and reduces the capacity of dust collectors, fans, etc., reducing initial costs and running costs. Both are cheaper and contribute to resource and energy conservation.
(2) 従来のパルプ廃液の処理方法では、多量の水
分が蒸発するので燃焼温度が低く、硫化水素な
どの腐食性ガスが多量に発生し、このためボイ
ラチユーブの管壁温度が320℃程度以上になる
と急激に腐食が進行し、したがつてボイラを高
圧にすることができず水蒸気圧80Kg／cm2程度が
限度であつた。これに対して本発明の場合は、
廃液造粒物中に水分がきわめて少ないので燃焼
温度を高めることができるので、硫化水素など
の腐食性ガスの発生が抑制され、蒸気条件を高
圧化することができ、発電効率の向上を図るこ
とができる。(2) In conventional pulp waste liquid treatment methods, a large amount of water evaporates, resulting in a low combustion temperature and a large amount of corrosive gases such as hydrogen sulfide are generated, resulting in boiler tube wall temperatures exceeding 320°C. Corrosion progressed rapidly, and the boiler could not be raised to high pressure, so the water vapor pressure was limited to about 80 kg/cm 2 . On the other hand, in the case of the present invention,
Since there is very little water in the waste liquid granules, the combustion temperature can be raised, suppressing the generation of corrosive gases such as hydrogen sulfide, and making it possible to increase the pressure of steam conditions, improving power generation efficiency. Can be done.
(3) クラフトパルプ廃液においては、廃液造粒物
中の水分がきわめて少ないので、燃焼温度が上
昇し、薬品還元（Na2SO4→Na2S）率が、従
来法では95％前後であつたものが、本発明の方
法ではほぼ100％近くに向上する。なお
Na2SO4からNa2Sへの還元反応は、温度が高
い程進行する。(3) In the case of kraft pulp waste liquid, since the water content in the waste liquid granules is extremely low, the combustion temperature increases and the chemical reduction rate (Na 2 SO 4 → Na 2 S) is around 95% in the conventional method. However, with the method of the present invention, the improvement is nearly 100%. In addition
The reduction reaction from Na 2 SO 4 to Na 2 S progresses as the temperature increases.
(4) 廃液造粒物中に水分が殆どないので、燃焼室
内で燃焼排ガスと接触させていた乾燥工程、乾
燥ゾーンが不要となり、熱吸収率を上げられる
ので燃焼室を小型化、コンパクト化することが
できる。(4) Since there is almost no water in the waste liquid granules, there is no need for a drying process or a drying zone that brought the waste into contact with the combustion exhaust gas within the combustion chamber, and the heat absorption rate can be increased, making the combustion chamber smaller and more compact. be able to.
(5) 造粒物燃焼の場合は、ダストの飛散が少なく
過熱器、ボイラ本体など後部伝熱面に付着する
ダストによるトラブルが減少し、長期連続運転
が可能になるとともに、すす吹き装置に使用し
ている蒸気エネルギを低減させることができ省
エネルギに寄与する。(5) In the case of granule combustion, there is less dust scattering, which reduces troubles caused by dust adhering to rear heat transfer surfaces such as superheaters and boiler bodies, and enables long-term continuous operation, and can be used in soot blowing equipment. This contributes to energy saving by reducing the amount of steam energy used.
(6) 炉床部での還元燃焼と上部の酸化燃焼とが一
体となつた回収ボイラで、燃焼と蒸解薬品の回
収とを同時に行うことができる。(6) A recovery boiler that combines reductive combustion in the hearth and oxidative combustion in the upper part, making it possible to perform combustion and recovery of cooking chemicals at the same time.
(7) 燃焼室内に造粒物が散布されるので、散布さ
れた造粒物は下方に落下し、飛散することがな
いので、薬品の回収率が高くなる。(7) Since the granules are spread inside the combustion chamber, the spread granules fall downward and do not scatter, increasing the recovery rate of chemicals.
第１図は従来の回収ボイラの一例を示す説明
図、第２図は本発明の方法を実施する装置の一例
を示す説明図である。
１…パルプ廃液タンク、２…輸送ポンプ、３…
スプレーガン、４…燃焼室、５…スメルト排出
口、６…過熱器、７…ボイラ本体、８…エコノマ
イザ、１０…燃焼排ガスダクト、１１…乾燥・固
形化装置、１２…ホツパ、１３…スクリユーコン
ベア、１４…スプレツダ、１５…燃焼室、１６…
造粒装置。
FIG. 1 is an explanatory diagram showing an example of a conventional recovery boiler, and FIG. 2 is an explanatory diagram showing an example of an apparatus for implementing the method of the present invention. 1... Pulp waste liquid tank, 2... Transport pump, 3...
Spray gun, 4...Combustion chamber, 5...Smelt discharge port, 6...Superheater, 7...Boiler body, 8...Economizer, 10...Combustion exhaust gas duct, 11...Drying/solidifying device, 12...Hopper, 13...Screw Conveyor, 14... Spreader, 15... Combustion chamber, 16...
Granulation equipment.
Claims (1)
品および水蒸気を回収するクラフトパルプ法にお
けるパルプ廃液の処理方法において、パルプ廃液
を予め乾燥、固形化した後、造粒し、この廃液造
粒物を回収ボイラに散布して、造粒物のうち、有
機物は炉床部の還元雰囲気での還元燃焼から、さ
らに炉内上部に移り酸化燃焼させるとともに、無
機物中の硫酸ソーダは、炉床部の還元雰囲気で燃
焼させ、溶融状の硫化ソーダを炉底部から蒸解薬
品として回収することを特徴とするパルプ廃液の
処理方法。1 In a method for treating pulp waste liquid in the kraft pulp method in which pulp waste liquid is burned in a recovery boiler to recover cooking chemicals and steam, the pulp waste liquid is dried and solidified in advance, then granulated, and the waste liquid granules are recovered. Sprinkled into the boiler, the organic matter in the granules undergoes reductive combustion in the reducing atmosphere of the hearth, then moves to the upper part of the furnace and is oxidized and burned, while the sodium sulfate in the inorganic matter is oxidized and burned in the reducing atmosphere of the hearth. A method for treating pulp waste liquid, which is characterized by burning it in a furnace and recovering molten soda sulfide from the bottom of the furnace as a cooking chemical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3175681A JPS57149593A (en) | 1981-03-05 | 1981-03-05 | Treatment of pulp waste liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3175681A JPS57149593A (en) | 1981-03-05 | 1981-03-05 | Treatment of pulp waste liquid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57149593A JPS57149593A (en) | 1982-09-16 |
| JPH0223634B2 true JPH0223634B2 (en) | 1990-05-24 |
Family
ID=12339861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3175681A Granted JPS57149593A (en) | 1981-03-05 | 1981-03-05 | Treatment of pulp waste liquid |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57149593A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4619732A (en) * | 1983-12-02 | 1986-10-28 | The Institute Of Paper Chemistry | Method for drying pulping liquor to a burnable solid |
| US5143579A (en) * | 1991-07-31 | 1992-09-01 | International Paper Company | Treatment of black liquor with a screw extruder evaporator |
| US20100206499A1 (en) * | 2009-02-13 | 2010-08-19 | Zilkha Biomass Acquisitions Company L.L.C. | Methods for Producing Biomass-Based Fuel With Pulp Processing Equipment |
| KR102063409B1 (en) * | 2015-12-25 | 2020-01-07 | 세이코 피엠씨 가부시키가이샤 | Polyacrylamide-based paper additive and its production method, and paper production method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4888773A (en) * | 1972-02-25 | 1973-11-20 | ||
| JPS492901A (en) * | 1972-03-30 | 1974-01-11 |
-
1981
- 1981-03-05 JP JP3175681A patent/JPS57149593A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4888773A (en) * | 1972-02-25 | 1973-11-20 | ||
| JPS492901A (en) * | 1972-03-30 | 1974-01-11 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57149593A (en) | 1982-09-16 |
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