JP2009161391A - Carbon dioxide gas circulation type limestone burning furnace - Google Patents

Carbon dioxide gas circulation type limestone burning furnace Download PDF

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JP2009161391A
JP2009161391A JP2008000073A JP2008000073A JP2009161391A JP 2009161391 A JP2009161391 A JP 2009161391A JP 2008000073 A JP2008000073 A JP 2008000073A JP 2008000073 A JP2008000073 A JP 2008000073A JP 2009161391 A JP2009161391 A JP 2009161391A
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carbon dioxide
limestone
dioxide gas
furnace
circulating
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Seiji Iwamura
岩村征治
Minoru Hirai
平井稔
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AIENJI KK
Kawai Lime Industry Co Ltd
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AIENJI KK
Kawai Lime Industry Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00Technologies relating to the processing of minerals
    • Y02P40/40Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills

Abstract

<P>PROBLEM TO BE SOLVED: To provide a carbon dioxide gas circulation type limestone burning furnace which can recover a large amount of carbon dioxide gas with high purity which is generated by the decomposition of limestone and discharged from a limestone burning furnace when limestone is burned, and which enables utilization of the carbon dioxide gas as a liquefied carbon dioxide and underground fixing treatment thereof. <P>SOLUTION: The carbon dioxide gas generated by the decomposition of limestone is circulated using a carbon dioxide gas circulating fan 106. The circulated carbon dioxide gas is heated to a burning temperature without incorporation of combustion gas with an electrical heater 107 or a radiant tube heater, whereby the temperature and the amount of heat required for burning limestone are ensured to burn limestone. The carbon dioxide gas 4 with high purity generated at this time is bled from a burning furnace outlet piping, stored, and treated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

石灰工場においては石灰石焼成時に大量の炭酸ガスが大気中に放出され地球温暖化への悪影響が懸念されており、これを防止するために炭酸ガスを回収する技術開発が進められている。石灰石焼成により排出される炭酸ガスを高濃度で回収するために、焼成燃料としてコークスを使用し、酸素で燃焼させることにより炭酸ガスを回収する方法、あるいは石灰石を間接的に加熱して炭酸ガスを回収する方法が提案されている。       At the lime factory, a large amount of carbon dioxide gas is released into the atmosphere when limestone is fired, and there is concern about adverse effects on global warming. To prevent this, technology development for collecting carbon dioxide gas has been underway. In order to recover carbon dioxide gas discharged by limestone firing at a high concentration, coke is used as a calcined fuel and carbon dioxide gas is recovered by burning with oxygen, or limestone is indirectly heated to produce carbon dioxide gas. A collection method has been proposed.

石灰石焼成時に発生する炭酸ガスを回収する方法として、石灰石中に一定割合で混入させたコークスを酸素で燃焼させれば、炭酸ガス以外のガスは発生しないため炉内から排出されるガスはコークスの燃焼による炭酸ガスと石灰石の分解による炭酸ガスのみとなるが、石灰石とコークスを均一に混合し均一に燃焼させないと酸素の過不足が生じたり熱媒となるガス不足のために石灰石へ熱が均一に伝わらず石灰石に焼きむらが出来ることが避けられないという問題がある。       As a method of recovering carbon dioxide gas generated during limestone firing, if coke mixed in limestone at a constant rate is burned with oxygen, no gas other than carbon dioxide gas is generated, so the gas discharged from the furnace is Only carbon dioxide from combustion and carbon dioxide from decomposition of limestone are used, but if limestone and coke are mixed uniformly and not burned uniformly, excess or deficiency of oxygen occurs or heat is uniformly distributed to limestone due to a lack of heat medium. There is a problem that it is unavoidable that limestone is unevenly burned.

また、間接加熱による石灰石焼成炉は石灰石に伝える熱量が伝熱面積に比例するため生産量も伝熱面積に比例することになるが、伝熱面積は炉体の表面積自体であるため構造上その伝熱面積には限界がある。従って、石灰石焼成炉1基当りの生産量はせいぜい1日当り数トンであり数百トンの実用規模にスケールアップが難しく数量を増やして対応することとなりスケールメリットが少なく経済性に難点がある。     In addition, the amount of heat transferred to the limestone in the indirect heating limestone furnace is proportional to the heat transfer area, so the production volume is also proportional to the heat transfer area, but the heat transfer area is the surface area of the furnace body itself, There is a limit to the heat transfer area. Therefore, the production amount per one limestone firing furnace is at most several tons per day, and it is difficult to scale up to a practical scale of several hundred tons, and it is difficult to scale up, so there is little merit of scale and there is a difficulty in economic efficiency.

石灰石を焼成するためには少なくとも石灰石を850℃以上に加熱し、石灰石の分解熱に相当する熱量を石灰石に与える必要があり、その熱量を与える高温ガスを得るための燃料としては容易に燃焼し高温ガスを発生しやすい化石燃料を使用するのが一般的である。この燃料を燃焼させるのに空気を使用するため燃焼ガス中には空気中の窒素がのこり、燃焼で発生した炭酸ガスや水蒸気と石灰石分解により発生する炭酸ガスが混合し全排ガス中の炭酸ガス濃度は30%以下になり発生する炭酸ガスの有効利用が難しく1部を除いてほとんどが大気中に放出され地球温暖化の一因となっている。       In order to burn limestone, at least limestone must be heated to 850 ° C. or higher, and heat corresponding to the heat of decomposition of limestone needs to be given to limestone. It is common to use fossil fuels that tend to generate hot gases. Since air is used to burn this fuel, nitrogen in the air remains in the combustion gas, and carbon dioxide gas generated by combustion, water vapor and carbon dioxide gas generated by limestone decomposition are mixed, and the concentration of carbon dioxide in the total exhaust gas Is less than 30%, and it is difficult to effectively use the generated carbon dioxide gas, except for one part, and most of it is released into the atmosphere, contributing to global warming.

この課題を解決するための請求項1の発明は、石灰石焼成用熱媒として焼成時に発生した炭酸ガスを利用し、循環ガスファンを用いて循環させ電熱ヒーターあるいはラジアントチューブヒーターにて焼成に必要な温度まで当該炭酸ガスを加熱昇温することで、発生炭酸ガス以外のガスの混入をなくし発生炭酸ガスを高純度の炭酸ガスとして回収することを可能にする。       The invention of claim 1 for solving this problem uses carbon dioxide gas generated during firing as a heating medium for limestone firing, is circulated using a circulation gas fan, and is necessary for firing with an electric heater or a radiant tube heater. By heating and raising the temperature of the carbon dioxide gas to a temperature, it is possible to eliminate mixing of gases other than the generated carbon dioxide gas and recover the generated carbon dioxide gas as high-purity carbon dioxide gas.

請求項2の発明は、循環ガスは充填層の入口側と出口側とでは温度差が出来るため入口側に比べ出口側の石灰石は分解に時間がかかり生産効率が低下する傾向がありそれを防止するためにあらかじめ石灰石中にコークスを混入させておくとともに循環ガスの入口出口ともに仕切りを入れて上下に分け、焼成帯下部に流入する循環ガスにコークス燃焼に見合った量の酸素を注入することにより焼成帯下部において石灰石中のコークスを燃焼させて循環ガス温度の低下を防ぎ不足熱量を補うことで石灰石焼成を均一化させる。       According to the invention of claim 2, the circulating gas has a temperature difference between the inlet side and the outlet side of the packed bed, so that the limestone on the outlet side takes longer to decompose than the inlet side, and the production efficiency tends to be reduced. In order to do this, coke is mixed in limestone in advance and a partition is placed at both the inlet and outlet of the circulating gas to divide it into upper and lower parts. The coke in the limestone is combusted at the lower part of the calcining zone to prevent the circulation gas temperature from decreasing and to compensate for the insufficient heat quantity, thereby uniforming the limestone calcining.

請求項3の発明は、焼成を完了した製品は900℃程度に加熱されておりそのまま搬送貯蔵することは出来ないため常温近くまで冷却する必要があるが、炭酸ガスで冷却すると製品が再炭酸化する恐れがあるため高温のまま定量排出器で製品を切り出し、炉内炭酸ガスが大気中に漏れ出さないようシール性のある排出弁を経由して排出した後、別置きの製品冷却器で冷却して取り扱いの容易な100℃以下にする。       In the invention of claim 3, the product after baking is heated to about 900 ° C. and cannot be transported and stored as it is, so it is necessary to cool it to near room temperature. The product is cut out with a quantitative discharger at high temperature, discharged through a sealing discharge valve so that carbon dioxide in the furnace does not leak into the atmosphere, and then cooled with a separate product cooler. Thus, the temperature is set to 100 ° C. or less which is easy to handle.

本発明により純度の高い炭酸ガスを回収することが出来るため圧縮冷却して市販性があり付加価値の高い液化炭酸ガスとすることができるし、圧縮して地中に埋めたり海中に投棄することが可能となり地球温暖化防止対策の一助として期待できる。       Since high purity carbon dioxide gas can be recovered by the present invention, it can be compressed and cooled to obtain liquefied carbon dioxide gas that is commercially available and has high added value, and can be compressed and buried in the ground or dumped into the sea. Can be expected to help prevent global warming.

本発明の石灰石焼成炉に関する実施の形態について説明する。
なお、この形態は、発明の趣旨をより良く理解させるために説明するものであり、特に指定しない限り、本発明を限定するものではない。
Embodiments relating to the limestone firing furnace of the present invention will be described.
This embodiment is described for better understanding of the gist of the invention, and does not limit the present invention unless otherwise specified.

図1は、本発明の炭酸ガス循環式石灰石焼成炉の構成機器と石灰石およびガスの全体の流れを示すもので表1には生産量を100T/Dとした時の石灰石焼成における各部の熱量、圧力および物量の収支を示す。石灰石焼成炉100の上部より石灰石分解熱量の20%に相当する量のコークスを混入した石灰石はシール性を有する供給器103を介して充填層に供給され電熱ヒーター107により1100℃に加熱された循環炭酸ガスにより上部焼成帯101でおよそ80%焼成されさらに降下して下部焼成帯102においてコークスの燃焼熱を得て焼成を完了させ製品として定量排出器104により排出されシール性のある排出バルブ105を経て炉外排出される。また石灰焼成炉出口の循環炭酸ガス中の発生炭酸ガスは充填層出口圧力がプラスマイナスゼロになるよう抽気配管中に設けられた圧力調整弁108にて制御されながら抽気され冷却貯蔵される。発生炭酸ガスを抽気した後の循環炭酸ガスは循環ガスファン106により昇圧された後電熱ヒーター107で昇温されて石灰石焼成炉100に流入し充填層を通過する間に石灰石を焼成する。       FIG. 1 shows the components of the carbon dioxide circulating limestone firing furnace of the present invention and the overall flow of limestone and gas. Table 1 shows the amount of heat of each part in limestone firing when the production amount is 100 T / D. Shows the balance of pressure and quantity. The limestone mixed with coke corresponding to 20% of the calorie decomposition heat quantity from the upper part of the limestone firing furnace 100 is supplied to the packed bed through the supply device 103 having a sealing property and is heated to 1100 ° C. by the electric heater 107. The upper firing zone 101 is baked by about 80% by carbon dioxide gas, and further descends to obtain the combustion heat of coke in the lower firing zone 102 to complete the firing. The product is discharged as a product by the quantitative discharger 104 and has a sealing discharge valve 105. After that, it is discharged outside the furnace. The generated carbon dioxide in the circulating carbon dioxide at the lime firing furnace outlet is extracted and cooled and stored while being controlled by the pressure regulating valve 108 provided in the extraction pipe so that the packed bed outlet pressure becomes plus or minus zero. The circulating carbon dioxide gas extracted from the generated carbon dioxide gas is boosted by the circulating gas fan 106, heated by the electric heater 107, flows into the limestone baking furnace 100, and burns limestone while passing through the packed bed.

表1は、図1に示された場所における物質、温度、圧力、流量、顕熱を示す。       Table 1 shows the material, temperature, pressure, flow rate, and sensible heat at the location shown in FIG.

Figure 2009161391
Figure 2009161391

石灰石焼成時に大量に排出される炭酸ガスを高濃度回収することにより後処理が容易となり地球温暖化対策として有効となる。     By collecting a high concentration of carbon dioxide gas discharged in a large amount during limestone firing, post-treatment is facilitated and effective as a global warming countermeasure.

石灰炉全体構成機器とものの流れを示すフロー図である。It is a flowchart which shows the flow with the lime furnace whole structure apparatus.

符号の説明Explanation of symbols

100 石灰石焼成炉
101 上段焼成帯
102 下段焼成帯
103 供給バルブ
104 定量排出器
105 排出バルブ
106 循環ガスファン
107 電熱ヒーター
108 圧力調整弁

100 Limestone firing furnace
101 Upper firing zone
102 Lower firing zone
103 Supply valve
104 metering dispenser
105 Discharge valve
106 Circulating gas fan
107 electric heater
108 Pressure regulating valve

Claims (3)

相対する二層の格子煉瓦壁内に充填された石灰石充填層に炭酸ガスを通過させることにより石灰石を焼成する炭酸ガス循環式石灰石焼成炉において、石灰石の熱分解および石灰石の予熱により700℃乃至800℃まで温度の低下した石灰石焼成炉出口の炭酸ガスを炭酸ガス循環ファンを使用して循環させ電熱ヒーターあるいはラジアントチューブヒーターでガスが発生することなく石灰石焼成温度の1100℃程度まで昇温して石灰石充填層内を循環通過させ、石灰石の分解により新たに発生した分の炭酸ガスを炉出口配管より抽気して格子煉瓦出口の圧力が大気圧になるよう制御しながら高純度の炭酸ガスとして回収することを特徴とする請求項1記載の炭酸ガス循環式石灰石焼成炉。     In a carbon dioxide circulating limestone firing furnace in which limestone is fired by passing carbon dioxide through a limestone packed bed filled in two opposing lattice brick walls, 700 ° C. to 800 ° C. by pyrolysis of limestone and preheating of limestone. The carbon dioxide gas at the outlet of the limestone firing furnace whose temperature has decreased to ℃ is circulated using a carbon dioxide circulation fan, and the temperature is raised to about 1100 ℃, which is the limestone firing temperature without generating gas with an electric heater or radiant tube heater. Circulating and passing through the packed bed, the carbon dioxide gas newly generated by the decomposition of limestone is extracted from the furnace outlet piping and recovered as high-purity carbon dioxide gas while controlling the pressure at the lattice brick outlet to atmospheric pressure. The carbon dioxide circulating limestone firing furnace according to claim 1, wherein: 石灰石の分解に必要な熱量の10%乃至20%に相当する熱量を発熱できる量のコークスを石灰石の中に混入させることにより石灰石の分解が完結しない場合の熱量を補充させる石灰石焼成炉において、石灰焼成帯の炭酸ガス出入口空間部に仕切りを設けて上下に分け下段の循環炭酸ガスにのみコークス量に見合った酸素を導入し焼成帯下部にてコークスを燃焼させることを特徴する請求項1に記載の炭酸ガス循環式石灰石焼成炉       In a limestone firing furnace that replenishes the amount of heat when the decomposition of limestone is not completed by mixing coke in an amount that can generate heat equivalent to 10% to 20% of the amount of heat required for decomposition of limestone, The partition is provided in the carbon dioxide gas inlet / outlet space of the calcining zone, divided into upper and lower portions, oxygen corresponding to the amount of coke is introduced only into the lower circulating carbon dioxide, and the coke is combusted at the lower portion of the calcining zone. Carbon dioxide circulating limestone firing furnace 焼成を完了した製品は高温のまま定量排出器で定量切り出し、炉内炭酸ガスと外気を遮断できる排出弁を経て炉外へ排出し、別置きの冷却器にて100℃以下に冷却して製品貯槽に貯蔵することを特徴とする請求項1に記載の炭酸ガス循環式石灰石焼成炉。





Products that have been baked are cut out with a quantitative discharger at a high temperature, discharged to the outside of the furnace through a discharge valve that can shut off carbon dioxide in the furnace and outside air, and cooled to 100 ° C or lower with a separate cooler. The carbon dioxide circulating limestone firing furnace according to claim 1, wherein the furnace is stored in a storage tank.





JP2008000073A 2008-01-04 2008-01-04 Carbon dioxide gas circulation type limestone burning furnace Pending JP2009161391A (en)

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CN102092967B (en) * 2009-12-15 2012-12-26 陈巨军 Energy-saving and environmentally-friendly automatic lime shaft kiln
CN106892578A (en) * 2017-04-17 2017-06-27 王长春 A kind of full recovery CO2Lime kiln device
CN107337360A (en) * 2017-07-26 2017-11-10 贵州省漆彩金州涂料有限公司 A kind of novel lime calciner
CN107759115A (en) * 2017-12-12 2018-03-06 泰安中意重型工业设备有限公司 The new process for calcining and device of a kind of powdered lime
CN107892493A (en) * 2017-12-15 2018-04-10 中冶焦耐(大连)工程技术有限公司 A kind of electrical heating shaft furnace and based on light calcined magnesia production technology thereon
CN108947280A (en) * 2018-08-20 2018-12-07 石家庄圣宏达热能工程技术股份有限公司 A kind of furnace atmosphere circulation formula lime stone muffle calcination system
WO2021068312A1 (en) * 2019-10-11 2021-04-15 江苏中圣园科技股份有限公司 Anti-nodulation structure of flow guide cap of sleeve kiln
CN112984782A (en) * 2021-02-05 2021-06-18 陕西翼飞航智能科技有限公司 Based on CO2Carbonate ore production and CO production in plasma hot blast stove2Decomposed gas recovery system and method
KR20220148961A (en) * 2021-04-29 2022-11-08 한국생산기술연구원 An apparatus and method for simultaneously producing a porous carbon-based adsorbent and a calcium-based material
CN115893875A (en) * 2023-01-29 2023-04-04 新疆八一钢铁股份有限公司 Shaft furnace lime kiln for reducing CO 2 Method of discharging
EP4332485A1 (en) 2022-08-29 2024-03-06 Fels-Werke GmbH Process and apparatus for producing fired lime or dolomite
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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102092967B (en) * 2009-12-15 2012-12-26 陈巨军 Energy-saving and environmentally-friendly automatic lime shaft kiln
CN106892578A (en) * 2017-04-17 2017-06-27 王长春 A kind of full recovery CO2Lime kiln device
CN106892578B (en) * 2017-04-17 2019-09-13 王长春 A kind of full recycling CO2Lime kiln device
CN107337360A (en) * 2017-07-26 2017-11-10 贵州省漆彩金州涂料有限公司 A kind of novel lime calciner
CN107759115A (en) * 2017-12-12 2018-03-06 泰安中意重型工业设备有限公司 The new process for calcining and device of a kind of powdered lime
CN107892493A (en) * 2017-12-15 2018-04-10 中冶焦耐(大连)工程技术有限公司 A kind of electrical heating shaft furnace and based on light calcined magnesia production technology thereon
CN108947280B (en) * 2018-08-20 2024-02-23 石家庄圣宏达热能工程技术股份有限公司 Furnace gas circulation type limestone flame-proof calcining system
CN108947280A (en) * 2018-08-20 2018-12-07 石家庄圣宏达热能工程技术股份有限公司 A kind of furnace atmosphere circulation formula lime stone muffle calcination system
WO2021068312A1 (en) * 2019-10-11 2021-04-15 江苏中圣园科技股份有限公司 Anti-nodulation structure of flow guide cap of sleeve kiln
CN112984782A (en) * 2021-02-05 2021-06-18 陕西翼飞航智能科技有限公司 Based on CO2Carbonate ore production and CO production in plasma hot blast stove2Decomposed gas recovery system and method
KR102555851B1 (en) 2021-04-29 2023-07-18 한국생산기술연구원 An apparatus and method for simultaneously producing a porous carbon-based adsorbent and a calcium-based material
KR20220148961A (en) * 2021-04-29 2022-11-08 한국생산기술연구원 An apparatus and method for simultaneously producing a porous carbon-based adsorbent and a calcium-based material
EP4332485A1 (en) 2022-08-29 2024-03-06 Fels-Werke GmbH Process and apparatus for producing fired lime or dolomite
EP4332484A1 (en) 2022-08-29 2024-03-06 Fels-Werke GmbH Device and method for the production of burnt lime or dolomite
EP4332483A1 (en) 2022-08-29 2024-03-06 Fels-Werke GmbH Device and method for the production of burnt lime or dolomite
CN115893875A (en) * 2023-01-29 2023-04-04 新疆八一钢铁股份有限公司 Shaft furnace lime kiln for reducing CO 2 Method of discharging
CN115893875B (en) * 2023-01-29 2024-01-12 新疆八一钢铁股份有限公司 Shaft furnace lime kiln CO reduction 2 Method of venting

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