JP2007238985A - Cooling system for exhaust gas in converter and method for driving cooling system of exhaust gas in converter - Google Patents

Cooling system for exhaust gas in converter and method for driving cooling system of exhaust gas in converter Download PDF

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JP2007238985A
JP2007238985A JP2006060799A JP2006060799A JP2007238985A JP 2007238985 A JP2007238985 A JP 2007238985A JP 2006060799 A JP2006060799 A JP 2006060799A JP 2006060799 A JP2006060799 A JP 2006060799A JP 2007238985 A JP2007238985 A JP 2007238985A
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cooling
air
steam
exhaust gas
water
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JP4840722B2 (en
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Hitotsugu Nakano
仁嗣 中野
Takaaki Minegishi
孝彰 峯岸
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Sumitomo Metal Mining Co Ltd
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    • 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
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Abstract

<P>PROBLEM TO BE SOLVED: To obtain the saving of water resource and also, to prevent the clogging in a cooling jacket and a water-supply piping caused by scaling. <P>SOLUTION: In a cooling system of exhaust gas in a converter for cooling the high temperature exhaust gas generated in the converter (1) by utilizing vaporizing latent heat of the cooling water in the cooling jacket (2); this cooling system has; an air-cooling type heat exchanger (3) for returning the vapor generated in the cooling jacket (2) to the water; water supplying passages (4, 6, 5, 7) for reusing by supplying distilled water obtained with the returned water as the cooling water into the cooling jacket (2); and a pressure adjusting fan (11) which connects with the outlet of the air-cooling type heat exchanger (3), and exhausting the vapor in this heat exchanger (3) into the atmosphere to adjust the vapor pressure. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、転炉から発生する高温の排ガスを冷却するための転炉排ガス冷却システムおよび転炉排ガス冷却システムの運転方法に関する。 The present invention relates to a converter exhaust gas cooling system for cooling high-temperature exhaust gas generated from a converter and an operation method of the converter exhaust gas cooling system.

非鉄金属、例えば銅の乾式製錬において、自熔炉などの溶錬炉で銅精鉱を処理して得られたマットは、転炉に装入され、粗銅とされるが、このマットを粗銅に転化する過程において、亜硫酸ガスを含む高温の排ガスが排出される。この排ガスは、硫酸製造の原料として排熱ボイラーを経由して、硫酸製造工程に送られる。 In dry smelting of non-ferrous metals, such as copper, the mat obtained by processing copper concentrate in a smelting furnace such as a self-smelting furnace is charged into a converter and made into crude copper. In the process of conversion, high-temperature exhaust gas containing sulfurous acid gas is discharged. This exhaust gas is sent as a raw material for sulfuric acid production to a sulfuric acid production process via a waste heat boiler.

このとき発生する排ガスの捕集には、特許文献１に見られるように、転炉の周囲に設けられたフードが使用される。このフードは、高温の排ガスの熱による変形・歪みを防止するために、水冷の冷却ジャケットによって冷却されている。 For collecting the exhaust gas generated at this time, as seen in Patent Document 1, a hood provided around the converter is used. The hood is cooled by a water-cooled cooling jacket in order to prevent deformation and distortion due to the heat of high-temperature exhaust gas.

図１は、従来技術による転炉排ガス冷却システムを示している。転炉排ガス冷却システムは、転炉１から発生した高温の排ガスを捕集するために、転炉１の周囲に設けられたフード１６、このフード１６に設けられ、冷却水の蒸発潜熱を利用して、排ガスを冷却する冷却ジャケット２、冷却水を貯蔵するホールドタンク４、ホールドタンク４の冷却水を給水ヘッドタンク５へ送るポンプ６、給水ヘッドタンク５の冷却水を冷却ジャケット２に供給するジャケット給水タンク７などを有している。 FIG. 1 shows a converter exhaust gas cooling system according to the prior art. The converter exhaust gas cooling system uses a hood 16 provided around the converter 1 to collect the high-temperature exhaust gas generated from the converter 1, and is provided in the hood 16, and uses the latent heat of evaporation of cooling water. The cooling jacket 2 for cooling the exhaust gas, the hold tank 4 for storing the cooling water, the pump 6 for sending the cooling water of the hold tank 4 to the water supply head tank 5, and the jacket for supplying the cooling water of the water supply head tank 5 to the cooling jacket 2 It has a water supply tank 7 and the like.

冷却ジャケット２は、フード１６の周囲にそれと一体または別体として、複数に分割した状態として設けられ、冷却ジャケット２の各室は下部でそれぞれジャケット給水タンク７に接続され、上部で大気に通じている。ジャケット給水タンク７内の冷却水は、冷却ジャケット２の各室の冷却水レベルの低下に応じて補給されるようになっている。 The cooling jacket 2 is provided around the hood 16 as a single body or as a separate body, and is divided into a plurality of parts. Each chamber of the cooling jacket 2 is connected to the jacket water supply tank 7 at the lower part and communicates with the atmosphere at the upper part. Yes. The cooling water in the jacket water supply tank 7 is replenished as the cooling water level in each chamber of the cooling jacket 2 decreases.

転炉１から発生した高温の排ガスは、転炉１の周囲に設けられたフード１６によって捕集され、硫酸製造工程に送られるが、フード１６を通過する際に、冷却ジャケット２の冷却水により冷却される。冷却水は、ホールドタンク４からポンプ６によって送り出され、給水ヘッドタンク５、ジャケット給水タンク７を経て、各冷却ジャケット２の室内に送り込まれ、フード１６を冷し、フード１６に触れる排ガスを冷却する。このように、冷却水は、その蒸発潜熱を利用して、排ガスを冷却するとともに、フード１６の熱変形歪みを防止し、最終的に蒸気となり、大気に放出される。 The high-temperature exhaust gas generated from the converter 1 is collected by a hood 16 provided around the converter 1 and sent to the sulfuric acid production process. When passing through the hood 16, To be cooled. The cooling water is sent out from the hold tank 4 by the pump 6, passes through the water supply head tank 5 and the jacket water supply tank 7, and is sent into the interior of each cooling jacket 2, cools the hood 16, and cools the exhaust gas that touches the hood 16. . Thus, the cooling water uses the latent heat of vaporization to cool the exhaust gas, prevents thermal deformation distortion of the hood 16, and finally becomes steam and is released to the atmosphere.

従来技術による転炉排ガス冷却システムでは、冷却の際に発生した蒸気は、そのまま大気中に放出され、 蒸発分の冷却水は、新たに外部から補給水として供給されるシステムとなっている。このため、常に新しい補給水を外部から供給する必要があり、水資源の節約という面から問題があった。 In the converter flue gas cooling system according to the prior art, the steam generated during cooling is released into the atmosphere as it is, and the cooling water for evaporation is newly supplied as makeup water from the outside. For this reason, it is necessary to always supply new makeup water from the outside, which is problematic in terms of saving water resources.

また、従来技術による転炉排ガス冷却システムでは、冷却水として一般に工業用水が使用されるが、工業用水が蒸発する時に、冷却ジャケット２内でカルシウムやマグネシウムなどの硬度成分が飛躍的に濃縮されるため、冷却ジャケット２や配管内のスケーリングによる閉塞により、給水量が減少し、排ガスの廃熱が冷却ジャケット２に及ぼす熱負荷が増大する。このため、冷却ジャケット２の本体が焼損したり、また、スケーリング自身が冷却ジャケット２や配管を腐食させて、リークを発生させることがある。 Further, in the converter exhaust gas cooling system according to the prior art, industrial water is generally used as the cooling water, but when industrial water evaporates, hardness components such as calcium and magnesium are drastically concentrated in the cooling jacket 2. Therefore, the amount of water supply decreases due to the blockage due to scaling in the cooling jacket 2 and the piping, and the thermal load exerted on the cooling jacket 2 by the waste heat of the exhaust gas increases. For this reason, the main body of the cooling jacket 2 may be burned out, or the scaling itself may corrode the cooling jacket 2 and the piping to cause leakage.

その対策として軟水や純水を冷却水として利用する方法、頻繁にブローする方法などがあるが、いずれもコストアップにつながる点であまり有効ではない。また、水源が不足する地域においては、大量に水を消費する従来のシステムを採用することはできない。
実公平０７−４０５１４ As countermeasures, there are a method of using soft water or pure water as cooling water, a method of blowing frequently, and the like, but none of them is very effective in terms of cost increase. Further, in an area where the water source is insufficient, a conventional system that consumes a large amount of water cannot be adopted.
Reality 07-40514

本発明の課題は、上記問題を解決するため、スケーリングの原因となる硬度成分を含まない蒸留水を冷却水として再使用（リサイクル）することにより、水資源の節約を図るとともに、スケーリングによる冷却ジャケットや給水配管内の閉塞を防止することである。 In order to solve the above-described problem, the present invention aims to save water resources by reusing (recycling) distilled water that does not contain a hardness component that causes scaling, as cooling water. And blockage in the water supply pipe.

また、本発明の他の課題は、冷却ジャケットから蒸発した蒸気を一定圧力（大気圧）に維持する制御技術を提供し、蒸気圧力の変動による設備破壊の危険を回避し、システムの安全性を確保することである。 Another object of the present invention is to provide a control technology for maintaining the vapor evaporated from the cooling jacket at a constant pressure (atmospheric pressure), avoiding the risk of equipment destruction due to fluctuations in the steam pressure, and improving the safety of the system. It is to secure.

上記の課題のもとに、請求項１の発明は、冷却ジャケット（２）内の冷却水の蒸発潜熱を利用して、転炉（１）で発生した高温の排ガスを冷却する転炉排ガス冷却システムにおいて、冷却ジャケット（２）で発生した蒸気を復水する空冷式熱交換器（３）と、復水により得られた蒸留水を冷却水として冷却ジャケット（２）に供給して再使用（リサイクル）する給水経路（４、６、５、７）とを有することを特徴とする。 Based on the above problems, the invention of claim 1 is directed to converter exhaust gas cooling that cools high-temperature exhaust gas generated in the converter (1) using latent heat of vaporization of cooling water in the cooling jacket (2). In the system, an air-cooled heat exchanger (3) for condensing steam generated in the cooling jacket (2), and distilled water obtained by the condensate are supplied as cooling water to the cooling jacket (2) for reuse ( And a water supply path (4, 6, 5, 7) for recycling.

請求項２の発明は、冷却ジャケット（２）内の冷却水の蒸発潜熱を利用して、転炉（１）で発生した高温の排ガスを冷却する転炉排ガス冷却システムにおいて、冷却ジャケット（２）で発生した蒸気を復水する空冷式熱交換器（３）と、復水により得られた蒸留水を冷却水として冷却ジャケット（２）に供給して再使用（リサイクル）する給水経路（４、６、５、７）と、空冷式熱交換器（３）の出力側に接続され、空冷式熱交換器（３）内の蒸気を大気に放出して、蒸気圧力を調整する圧力調整ファン（１１）とを有することを特徴とする。 The invention according to claim 2 is the converter exhaust gas cooling system for cooling the high-temperature exhaust gas generated in the converter (1) using the latent heat of vaporization of the cooling water in the cooling jacket (2). An air-cooled heat exchanger (3) for condensing steam generated in the water, and a water supply path (4, 4) for supplying distilled water obtained by the condensate as cooling water to the cooling jacket (2) for reuse (recycling) 6, 5, 7) and a pressure adjusting fan (which is connected to the output side of the air-cooled heat exchanger (3)) and releases the steam in the air-cooled heat exchanger (3) to the atmosphere to adjust the steam pressure ( 11).

請求項３の発明は、冷却ジャケット（２）内の冷却水の蒸発潜熱を利用して、転炉（１）で発生した高温の排ガスを冷却する転炉排ガス冷却システムにおいて、冷却ジャケット（２）で発生した蒸気を復水する空冷式熱交換器（３）と、復水により得られた蒸留水を冷却水として冷却ジャケット（２）に供給して再使用（リサイクル）する給水経路（４、６、５、７）と、空冷式熱交換器（３）の入口側の蒸気管（８）に接続され、蒸気管（８）内の蒸気圧力を検出する圧力計（１０）と、空冷式熱交換器（３）の出力側に接続され、空冷式熱交換器（３）内の蒸気を大気に放出して、蒸気圧力を調整する圧力調整ファン（１１）と、圧力調整ファン（１１）の吸引口側に接続され、外気を取り込むコック（１５）とを有し、
圧力計（１０）が大気圧を越えた蒸気管（８）内の蒸気圧力を検出したときに、その偏差に応じてコック（１５）の開度を調節し、圧力調整ファン（１１）の外気流入量を調整することによって、蒸気圧力を大気圧に調整することを特徴とする。 The invention according to claim 3 is a converter exhaust gas cooling system for cooling a high-temperature exhaust gas generated in the converter (1) by using latent heat of vaporization of cooling water in the cooling jacket (2). An air-cooled heat exchanger (3) for condensing steam generated in the water, and a water supply path (4, 4) for supplying distilled water obtained by the condensate as cooling water to the cooling jacket (2) for reuse (recycling) 6, 5, 7), a pressure gauge (10) connected to the steam pipe (8) on the inlet side of the air-cooled heat exchanger (3) and detecting the steam pressure in the steam pipe (8), and an air-cooled type A pressure adjusting fan (11) that is connected to the output side of the heat exchanger (3) and discharges the steam in the air-cooled heat exchanger (3) to the atmosphere to adjust the steam pressure, and the pressure adjusting fan (11) A cock (15) that is connected to the suction port side and takes in outside air,
When the pressure gauge (10) detects the steam pressure in the steam pipe (8) exceeding the atmospheric pressure, the opening of the cock (15) is adjusted according to the deviation, and the outside air of the pressure adjusting fan (11) The steam pressure is adjusted to atmospheric pressure by adjusting the amount of inflow.

請求項４の発明は、冷却ジャケット（２）内の冷却水の蒸発潜熱を利用して、転炉（１）で発生した高温の排ガスを冷却する転炉排ガス冷却システムにおいて、冷却ジャケット（２）で発生した蒸気を復水する空冷式熱交換器（３）と、復水により得られた蒸留水を冷却水として冷却ジャケット（２）に供給して再使用（リサイクル）する給水経路（４、６、５、７）と、空冷式熱交換器（３）の出力側に接続された復水管（９）に接続され、復水の温度を検出する温度計（１４）と、空冷式熱交換器（３）に空気を送り込む空冷ファン（１２）とを有し、温度計（１４）により検出された復水の温度に応じて空冷ファン（１２）の回転数を変動させることを特徴とする。 According to a fourth aspect of the present invention, there is provided a converter exhaust gas cooling system for cooling a high-temperature exhaust gas generated in the converter (1) using the latent heat of evaporation of cooling water in the cooling jacket (2). An air-cooled heat exchanger (3) for condensing steam generated in the water, and a water supply path (4, 4) for supplying distilled water obtained by the condensate as cooling water to the cooling jacket (2) for reuse (recycling) 6, 5, 7), a thermometer (14) connected to the condensate pipe (9) connected to the output side of the air-cooled heat exchanger (3) and detecting the temperature of the condensate, and air-cooled heat exchange And an air cooling fan (12) for sending air to the vessel (3), and the rotational speed of the air cooling fan (12) is varied according to the condensate temperature detected by the thermometer (14). .

請求項５の発明は、冷却ジャケット（２）内の冷却水の蒸発潜熱を利用して、転炉（１）で発生した高温の排ガスを冷却する転炉排ガス冷却システムにおいて、冷却ジャケット（２）で発生した蒸気を復水する空冷式熱交換器（３）と、復水により得られた蒸留水を冷却水として冷却ジャケット（２）に供給して再使用（リサイクル）する給水経路（４、６、５、７）と、空冷式熱交換器（３）の入口側の蒸気管（８）に接続され、蒸気管（８）内の蒸気圧力を検出する圧力計（１０）と、空冷式熱交換器（３）の出力側に接続され、空冷式熱交換器（３）内の蒸気を大気に放出して、蒸気圧力を調整する圧力調整ファン（１１）と、圧力調整ファン（１１）の吸引口側に接続され、外気を取り込むコック（１５）と、空冷式熱交換器（３）の入口側の蒸気管（８）に接続され、水を封入されているシールポット（１３）とを有し、圧力計（１０）が大気圧を越えた蒸気管（８）内の蒸気圧力を検出したときに、その偏差に応じてコック（１５）の開度を調節し、圧力調整ファン（１１）の外気流入量を調整することによって、蒸気圧力を大気圧に調整し、また蒸気圧力がシールポット（１３）の水圧を越えたとき、蒸気管（８）内の蒸気を大気に放出することを特徴とする。 The invention according to claim 5 is a converter exhaust gas cooling system for cooling a high-temperature exhaust gas generated in the converter (1) by using latent heat of evaporation of cooling water in the cooling jacket (2). An air-cooled heat exchanger (3) for condensing steam generated in the water, and a water supply path (4, 4) for supplying distilled water obtained by the condensate as cooling water to the cooling jacket (2) for reuse (recycling) 6, 5, 7), a pressure gauge (10) connected to the steam pipe (8) on the inlet side of the air-cooled heat exchanger (3) and detecting the steam pressure in the steam pipe (8), and an air-cooled type A pressure adjusting fan (11) that is connected to the output side of the heat exchanger (3) and discharges the steam in the air-cooled heat exchanger (3) to the atmosphere to adjust the steam pressure, and the pressure adjusting fan (11) A cock (15) connected to the suction port side for taking in outside air, and an air-cooled heat exchanger (3) It has a seal pot (13) connected to the steam pipe (8) on the inlet side and sealed with water, and the pressure gauge (10) detects the steam pressure in the steam pipe (8) exceeding the atmospheric pressure. The steam pressure is adjusted to atmospheric pressure by adjusting the opening of the cock (15) according to the deviation and adjusting the outside air inflow amount of the pressure adjusting fan (11), and the steam pressure is sealed. When the water pressure in the pot (13) is exceeded, the steam in the steam pipe (8) is released to the atmosphere.

請求項１の発明によると、熱回収後の蒸気を復水し、冷却水として再使用（リサイクル）するから水資源の節約を図ることができる。また、スケーリングの原因となる硬度成分を含まない蒸留水を冷却水として使用するから、冷却水に含まれる硬度成分の濃縮によるスケーリングに伴う設備トラブルを防止することができる。 According to the first aspect of the invention, the steam after heat recovery is condensed and reused (recycled) as cooling water, so that water resources can be saved. In addition, since distilled water that does not contain a hardness component that causes scaling is used as cooling water, it is possible to prevent equipment troubles associated with scaling due to concentration of hardness components contained in the cooling water.

請求項２の発明によると、請求項１の発明の効果の他に、空冷式熱交換器内の蒸気圧力が圧力調整ファンにより調整されるから、蒸気経路の圧力上昇が回避でき、安全な設備として運転が可能となり、圧力上昇を考慮した冷却ジャケットの設計が不必要となり、設備、費用の低減が可能となる。復水手段として例えば水冷式のクーリングタワーを使用したときには、冷却ジャケットと同様に、やはり、蒸発潜熱を利用して冷却することになり、冷却水の補充が必要となるが、空冷式熱交換器によると、その必要はなく、取扱いも容易となる。 According to the invention of claim 2, in addition to the effect of the invention of claim 1, the steam pressure in the air-cooled heat exchanger is adjusted by the pressure adjustment fan. As a result, it becomes unnecessary to design a cooling jacket in consideration of the pressure rise, and it is possible to reduce equipment and costs. For example, when a water-cooled cooling tower is used as a condensing means, cooling is also performed using latent heat of vaporization as in the case of the cooling jacket, and cooling water needs to be replenished. This is not necessary and the handling becomes easy.

請求項３の発明によると、請求項１、請求項２の発明の効果の他に、圧力計が大気圧を越えた蒸気管内の蒸気圧力を検出したときに、その偏差に応じてコックの開度を調節し、圧力調整ファンの外気流入量を調整するから、蒸気経路の蒸気圧力が大気圧に自動的に調整でき、これによって、転炉での排ガスの温度変動に充分な対処ができる。 According to the invention of claim 3, in addition to the effects of the inventions of claims 1 and 2, when the pressure gauge detects the steam pressure in the steam pipe exceeding the atmospheric pressure, the opening of the cock according to the deviation is detected. Therefore, the steam pressure in the steam path can be automatically adjusted to the atmospheric pressure, thereby sufficiently dealing with the temperature fluctuation of the exhaust gas in the converter.

請求項４の発明によると、請求項１、請求項２の発明の効果の他に、温度計により検出された復水の温度に応じて、空冷ファンの回転数が自動的に変動させるから、蒸気の温度の変化に対して、適切な風量が確保でき、これにより蒸気から復水への変換効率が高められる。 According to the invention of claim 4, in addition to the effects of the inventions of claims 1 and 2, the rotational speed of the air cooling fan automatically varies according to the condensate temperature detected by the thermometer. Appropriate air volume can be secured against changes in steam temperature, thereby increasing the efficiency of conversion from steam to condensate.

請求項５の発明によると、請求項１、請求項２、請求項３の発明の効果の他に、蒸気圧力がシールポットの水圧を越えたとき、蒸気管内の蒸気が強制的に大気に放出されるから、圧力計や制御機器の故障や、蒸発量の急増に対して圧力制御が追随できないときに、蒸気圧力の異常な上昇が未然に防止でき、これにより安全性が維持できる。 According to the invention of claim 5, in addition to the effects of the inventions of claim 1, claim 2 and claim 3, when the steam pressure exceeds the water pressure of the seal pot, the steam in the steam pipe is forcibly released to the atmosphere. Therefore, when the pressure control cannot follow the failure of the pressure gauge or the control device or the rapid increase of the evaporation amount, the abnormal rise of the steam pressure can be prevented in advance, thereby maintaining the safety.

図２は、本発明の転炉排ガス冷却システムを示している。本発明の転炉排ガス冷却システムは、図１のものと基本的にほぼ同様であり、転炉１から発生した高温の排ガスを捕集するために、転炉１の周囲に設けられたフード１６、フード１６に設けられ、冷却水の蒸発潜熱を利用して、排ガスを冷却する冷却ジャケット２、冷却水を貯蔵するホールドタンク４、ホールドタンク４の冷却水を給水ヘッドタンク５へ送るポンプ６、給水ヘッドタンク５の冷却水を冷却ジャケット２に供給するジャケット給水タンク７などを有している。 FIG. 2 shows the converter exhaust gas cooling system of the present invention. The converter exhaust gas cooling system of the present invention is basically substantially the same as that shown in FIG. 1, and a hood 16 provided around the converter 1 to collect high-temperature exhaust gas generated from the converter 1. A cooling jacket 2 for cooling the exhaust gas by using the latent heat of vaporization of the cooling water, a hold tank 4 for storing the cooling water, a pump 6 for sending the cooling water of the hold tank 4 to the water supply head tank 5, A jacket water supply tank 7 for supplying the cooling water of the water supply head tank 5 to the cooling jacket 2 is provided.

冷却ジャケット２は、フード１６の周囲にそれと一体または別体として、必要に応じて複数に分割した状態として設けられ、冷却ジャケット２の各室は、下部でそれぞれジャケット給水タンク７に接続され、冷却ジャケット２の各室の上部は、すべて蒸気管８に接続されている。ジャケット給水タンク７は、冷却ジャケット２の各室ごとに冷却水レベルを維持するように構成されている。 The cooling jacket 2 is provided around the hood 16 as a single body or as a separate body, and is divided into a plurality of parts as necessary. Each chamber of the cooling jacket 2 is connected to the jacket water supply tank 7 at the lower portion, and cooled. The upper part of each chamber of the jacket 2 is all connected to the steam pipe 8. The jacket water supply tank 7 is configured to maintain the cooling water level for each chamber of the cooling jacket 2.

そして、本発明の転炉排ガス冷却システムは、復水手段として空冷式熱交換器３を有している。空冷式熱交換器３は、入口側で蒸気管８に接続されており、出口側で復水管９によりホールドタンク４に接続されている。ここで、ホールドタンク４、ポンプ６、給水ヘッドタンク５、ジャケット給水タンク７は、給水経路を構成している。 And the converter exhaust gas cooling system of this invention has the air-cooling type heat exchanger 3 as a condensate means. The air-cooled heat exchanger 3 is connected to the steam pipe 8 on the inlet side, and connected to the hold tank 4 via the condensate pipe 9 on the outlet side. Here, the hold tank 4, the pump 6, the water supply head tank 5, and the jacket water supply tank 7 constitute a water supply path.

本発明の転炉排ガス冷却システムによる冷却プロセスは、次のように作用する。転炉１で発生した高温の排ガスは、転炉１の周囲に設けられたフード１６によって捕集され、フード１６を通過する際に、冷却ジャケット２の冷却水により冷却される。すなわち、冷却水は、ホールドタンク４からポンプ６によって送り出され、給水ヘッドタンク５、ジャケット給水タンク７を経て、冷却ジャケット２内に送り込まれ、フード１６を冷し、フード１６に触れる排ガスを冷却する。 The cooling process by the converter exhaust gas cooling system of the present invention operates as follows. The high-temperature exhaust gas generated in the converter 1 is collected by a hood 16 provided around the converter 1, and is cooled by the cooling water in the cooling jacket 2 when passing through the hood 16. That is, the cooling water is sent out from the hold tank 4 by the pump 6, passed through the water supply head tank 5 and the jacket water supply tank 7, and sent into the cooling jacket 2 to cool the hood 16 and cool the exhaust gas that touches the hood 16. .

このため、排ガスの熱は、冷却ジャケット２によって、冷却ジャケット２内を流れる冷却水に奪われ、冷却される。冷却された排ガスは、硫酸製造の原料として、硫酸製造工程に送られる。冷却ジャケット２の各室内を流れる冷却水は、排ガスの熱により加熱され、蒸発する。このようにして冷却水は、その蒸発潜熱を利用して、高温の排ガスを冷却するとともに、フード１６の熱変形歪みを防止し、最終的に蒸気となる。 For this reason, the heat of the exhaust gas is taken by the cooling water flowing in the cooling jacket 2 by the cooling jacket 2 and cooled. The cooled exhaust gas is sent to the sulfuric acid production process as a raw material for sulfuric acid production. The cooling water flowing through each chamber of the cooling jacket 2 is heated by the heat of the exhaust gas and evaporates. In this way, the cooling water uses the latent heat of vaporization to cool the high-temperature exhaust gas, prevents thermal deformation distortion of the hood 16, and finally becomes steam.

冷却水の蒸気は、蒸気管８に集められ、それを経由し、復水手段としての空冷式熱交換器３に到達し、空冷式熱交換器３の内部で空気冷却され、復水（蒸留水）となる。この復水（蒸留水）は、復水管９を経由し、ホールドタンク４に一旦、冷却水として貯蔵される。このあと、冷却水は、再度、冷却水として使用するため、給水ヘッドタンク５にポンプ６で供給される。 The steam of the cooling water is collected in the steam pipe 8 and reaches the air-cooled heat exchanger 3 as a condensing means, and is air-cooled inside the air-cooled heat exchanger 3 to condensate (distillation). Water). This condensate (distilled water) is temporarily stored as cooling water in the hold tank 4 via the condensate pipe 9. Thereafter, the cooling water is supplied again to the water supply head tank 5 by the pump 6 so as to be used again as cooling water.

復水（冷却水）は、給水ヘッドタンク５からヘッド圧にて各々のジャケット給水タンク７に供給され、ここから冷却ジャケット２の各室に供給される。冷却ジャケット２の各室ごとに、冷却水が蒸発すると、その蒸発分のみジャケット給水タンク７より補給される。このようにして冷却ジャケット２の各室に、常に一定レベルの冷却水が満たされている。 Condensate (cooling water) is supplied from the water supply head tank 5 to each jacket water supply tank 7 at the head pressure, and from here to each chamber of the cooling jacket 2. When the cooling water evaporates for each chamber of the cooling jacket 2, only the evaporated amount is supplied from the jacket water supply tank 7. In this way, each chamber of the cooling jacket 2 is always filled with a certain level of cooling water.

上記のように、冷却ジャケット２で発生した蒸気は、蒸気管８を通って空冷式熱交換器３により冷却され、復水されるが、蒸気が復水されるまでの間は大気と隔離されており、各冷却ジャケット２中の冷却水の蒸発量の変動に伴い、冷却ジャケット２の内部圧力も変動する。このため、瞬時に蒸発量が増加したときには、冷却ジャケット２などの内部圧力も急上昇し、冷却ジャケット２などの設備破壊に至る危険性が生じる。 As described above, the steam generated in the cooling jacket 2 is cooled by the air-cooled heat exchanger 3 through the steam pipe 8 and condensed, but is isolated from the atmosphere until the steam is condensed. As the amount of cooling water evaporated in each cooling jacket 2 varies, the internal pressure of the cooling jacket 2 also varies. For this reason, when the evaporation amount increases instantaneously, the internal pressure of the cooling jacket 2 and the like also rises rapidly, and there is a risk that the equipment such as the cooling jacket 2 is destroyed.

そこで、本発明の転炉排ガス冷却システム運転方法は、転炉排ガス冷却システムを以下のように、運転する。 Therefore, the converter exhaust gas cooling system operating method of the present invention operates the converter exhaust gas cooling system as follows.

図３は、本発明の転炉排ガス冷却システム運転方法による制御システムを示している。蒸気管８には圧力計１０が取り付けられており、圧力計１０は制御機能を内蔵しており、その出力は、外気取り込み用のコック１５の開度を操作する。また、空冷式熱交換器３の出口には、圧力調整ファン１１の吸引口が接続されており、空冷式熱交換器３からの吸入量は、コック１５の開度による外気の取り込み量によって調整できるようになっている。 FIG. 3 shows a control system according to the converter exhaust gas cooling system operating method of the present invention. A pressure gauge 10 is attached to the steam pipe 8, and the pressure gauge 10 has a built-in control function, and its output operates the opening of the cock 15 for taking in outside air. Further, a suction port of the pressure adjusting fan 11 is connected to the outlet of the air-cooled heat exchanger 3, and the intake amount from the air-cooled heat exchanger 3 is adjusted by the amount of outside air taken in by the opening of the cock 15. It can be done.

また、空冷式熱交換器３には、例えば２台の空冷ファン１２が設置されており、それらの空冷ファン１２の回転数（空冷ファン１２の駆動モータの回転数）は、復水管９に接続された温度計１４の出力に応じて加減できるようになっている。このために、空冷ファン１２または温度計１４に回転数制御機能が付与されている。なお、異常な事態を想定して、蒸気管８に、蒸気を大気放出させるために、シールポット１３が接続されている。 The air-cooled heat exchanger 3 is provided with, for example, two air-cooling fans 12, and the rotation speed of the air-cooling fans 12 (the rotation speed of the drive motor of the air-cooling fan 12) is connected to the condensate pipe 9. The temperature can be adjusted in accordance with the output of the thermometer 14. For this purpose, the air cooling fan 12 or the thermometer 14 is provided with a rotation speed control function. Note that a seal pot 13 is connected to the steam pipe 8 in order to release the steam to the atmosphere assuming an abnormal situation.

前記のように、冷却ジャケット２で発生した蒸気は、蒸気管８を通じて空冷式熱交換器３に送られる。この過程で、圧力計１０は、検出された蒸気管８の内部の蒸気圧力と大気圧とを比較し、蒸気圧力が大気圧を越えたとき、そのときの偏差に応じた出力を発生する。この圧力計１０の出力は、偏差に応じてコック１５を開度を調節し、圧力調整ファン１１への外気吸入量を調整することによって、空冷式熱交換器３の出口からの空気吸入量を加減する。これによって、空冷式熱交換器３の内部の蒸気圧力は、大気圧と同じに制御される。 As described above, the steam generated in the cooling jacket 2 is sent to the air-cooled heat exchanger 3 through the steam pipe 8. In this process, the pressure gauge 10 compares the detected steam pressure inside the steam pipe 8 with the atmospheric pressure, and when the steam pressure exceeds the atmospheric pressure, generates an output corresponding to the deviation at that time. The output of the pressure gauge 10 adjusts the opening of the cock 15 in accordance with the deviation, and adjusts the amount of air sucked into the pressure adjusting fan 11 to adjust the amount of air sucked from the outlet of the air-cooled heat exchanger 3. Moderate. As a result, the vapor pressure inside the air-cooled heat exchanger 3 is controlled to be the same as the atmospheric pressure.

また、圧力計１０などの制御機器が故障したときや、冷却ジャケット２における蒸発量が急増して、空冷ファン１２の回転数制御が一時的に追随できないときなどの事態が発生したときに、蒸気管８のシールポット１３は、蒸気管８の内の蒸気を大気に放出させ、異常な上昇を抑え、設備の破壊や危険を回避し、システムの安全性を確保する。 Further, when a control device such as the pressure gauge 10 breaks down, or when an evaporation amount in the cooling jacket 2 suddenly increases and the rotation speed control of the air cooling fan 12 cannot be temporarily followed, steam is generated. The seal pot 13 of the pipe 8 releases the steam in the steam pipe 8 to the atmosphere, suppresses an abnormal rise, avoids destruction of equipment and danger, and ensures the safety of the system.

本発明は、非鉄金属の転炉に限らず、その他の各種の転炉にも応用できる。 The present invention can be applied not only to nonferrous metal converters but also to other various converters.

従来技術による転炉排ガス冷却システムの説明図である。It is explanatory drawing of the converter exhaust gas cooling system by a prior art. 本発明に係る転炉排ガス冷却システムの説明図である。It is explanatory drawing of the converter exhaust gas cooling system which concerns on this invention. 本発明に係る転炉排ガス冷却システム運転方法を実施するときの制御システムの説明図である。It is explanatory drawing of a control system when implementing the converter exhaust gas cooling system operating method which concerns on this invention.

符号の説明Explanation of symbols

１ 転炉
２ 冷却ジャケット
３ 空冷式熱交換器
４ ホールドタンク
５ 給水ヘッドタンク
６ ポンプ
７ ジャケット給水タンク
８ 蒸気管
９ 復水管
１０ 圧力計
１１ 圧力調整ファン
１２ 空冷ファン
１３ シールポット
１４ 温度計
１５ コック
１６ フード DESCRIPTION OF SYMBOLS 1 Converter 2 Cooling jacket 3 Air cooling type heat exchanger 4 Hold tank 5 Water supply head tank 6 Pump 7 Jacket water supply tank 8 Steam pipe 9 Condensation pipe 10 Pressure gauge 11 Pressure adjusting fan 12 Air cooling fan 13 Seal pot 14 Thermometer 15 Cock 16 hood

Claims (5)

冷却ジャケット（２）内の冷却水の蒸発潜熱を利用して、転炉（１）で発生した高温の排ガスを冷却する転炉排ガス冷却システムにおいて、冷却ジャケット（２）で発生した蒸気を復水する空冷式熱交換器（３）と、復水により得られた蒸留水を冷却水として冷却ジャケット（２）に供給して再使用する給水経路（４、６、５、７）とを有することを特徴とする転炉排ガス冷却システム。 In the converter exhaust gas cooling system that cools the high-temperature exhaust gas generated in the converter (1) using the latent heat of vaporization of the cooling water in the cooling jacket (2), the steam generated in the cooling jacket (2) is condensed into the condensate. And an air-cooled heat exchanger (3) to be used and a water supply path (4, 6, 5, 7) for supplying distilled water obtained by condensate as cooling water to the cooling jacket (2) for reuse. Converter flue gas cooling system. 冷却ジャケット（２）内の冷却水の蒸発潜熱を利用して、転炉（１）で発生した高温の排ガスを冷却する転炉排ガス冷却システムにおいて、冷却ジャケット（２）で発生した蒸気を復水する空冷式熱交換器（３）と、復水により得られた蒸留水を冷却水として冷却ジャケット（２）に供給して再使用する給水経路（４、６、５、７）と、空冷式熱交換器（３）の出力側に接続され、空冷式熱交換器（３）内の蒸気を大気に放出して、蒸気圧力を調整する圧力調整ファン（１１）とを有することを特徴とする転炉排ガス冷却システム。 In the converter exhaust gas cooling system that cools the high-temperature exhaust gas generated in the converter (1) using the latent heat of vaporization of the cooling water in the cooling jacket (2), the steam generated in the cooling jacket (2) is condensed into the condensate. An air-cooled heat exchanger (3), a water supply path (4, 6, 5, 7) for supplying distilled water obtained by condensate as cooling water to the cooling jacket (2) for reuse, and an air-cooling type It is connected to the output side of the heat exchanger (3), and has a pressure adjusting fan (11) that discharges steam in the air-cooled heat exchanger (3) to the atmosphere and adjusts the steam pressure. Converter exhaust gas cooling system. 冷却ジャケット（２）内の冷却水の蒸発潜熱を利用して、転炉（１）で発生した高温の排ガスを冷却する転炉排ガス冷却システムにおいて、冷却ジャケット（２）で発生した蒸気を復水する空冷式熱交換器（３）と、復水により得られた蒸留水を冷却水として冷却ジャケット（２）に供給して再使用する給水経路（４、６、５、７）と、空冷式熱交換器（３）の入口側の蒸気管（８）に接続され、蒸気管（８）内の蒸気圧力を検出する圧力計（１０）と、空冷式熱交換器（３）の出力側に接続され、空冷式熱交換器（３）内の蒸気を大気に放出して、蒸気圧力を調整する圧力調整ファン（１１）と、圧力調整ファン（１１）の吸引口側に接続され、外気を取り込むコック（１５）とを有し、
圧力計（１０）が大気圧を越えた蒸気管（８）内の蒸気圧力を検出したときに、その偏差に応じてコック（１５）の開度を調節し、圧力調整ファン（１１）の外気流入量を調整することによって、蒸気圧力を大気圧に調整することを特徴とする転炉排ガス冷却システム運転方法。 In the converter exhaust gas cooling system that cools the high-temperature exhaust gas generated in the converter (1) using the latent heat of vaporization of the cooling water in the cooling jacket (2), the steam generated in the cooling jacket (2) is condensed into the condensate. An air-cooled heat exchanger (3), a water supply path (4, 6, 5, 7) for supplying distilled water obtained by condensate as cooling water to the cooling jacket (2) for reuse, and an air-cooling type A pressure gauge (10) connected to the steam pipe (8) on the inlet side of the heat exchanger (3) and detecting the steam pressure in the steam pipe (8), and an output side of the air-cooled heat exchanger (3) Connected to the pressure adjusting fan (11) for releasing the steam in the air-cooled heat exchanger (3) to the atmosphere and adjusting the steam pressure, and to the suction port side of the pressure adjusting fan (11), A take-in cock (15),
When the pressure gauge (10) detects the steam pressure in the steam pipe (8) exceeding the atmospheric pressure, the opening of the cock (15) is adjusted according to the deviation, and the outside air of the pressure adjusting fan (11) A converter exhaust gas cooling system operating method, wherein the steam pressure is adjusted to atmospheric pressure by adjusting an inflow amount. 冷却ジャケット（２）内の冷却水の蒸発潜熱を利用して、転炉（１）で発生した高温の排ガスを冷却する転炉排ガス冷却システムにおいて、冷却ジャケット（２）で発生した蒸気を復水する空冷式熱交換器（３）と、復水により得られた蒸留水を冷却水として冷却ジャケット（２）に供給して再使用する給水経路（４、６、５、７）と、空冷式熱交換器（３）の出力側に接続された復水管（９）に接続され、復水の温度を検出する温度計（１４）と、空冷式熱交換器（３）に空気を送り込む空冷ファン（１２）とを有し、温度計（１４）により検出された復水の温度に応じて空冷ファン（１２）の回転数を変動させることを特徴とする転炉排ガス冷却システム運転方法。 In the converter exhaust gas cooling system that cools the high-temperature exhaust gas generated in the converter (1) using the latent heat of vaporization of the cooling water in the cooling jacket (2), the steam generated in the cooling jacket (2) is condensed into the condensate. An air-cooled heat exchanger (3), a water supply path (4, 6, 5, 7) for supplying distilled water obtained by condensate as cooling water to the cooling jacket (2) for reuse, and an air-cooling type A thermometer (14) connected to the condensate pipe (9) connected to the output side of the heat exchanger (3) and detecting the temperature of the condensate, and an air cooling fan for sending air to the air cooling heat exchanger (3) (12) and changing the rotational speed of the air cooling fan (12) according to the temperature of the condensate detected by the thermometer (14). 冷却ジャケット（２）内の冷却水の蒸発潜熱を利用して、転炉（１）で発生した高温の排ガスを冷却する転炉排ガス冷却システムにおいて、冷却ジャケット（２）で発生した蒸気を復水する空冷式熱交換器（３）と、復水により得られた蒸留水を冷却水として冷却ジャケット（２）に供給して再使用する給水経路（４、６、５、７）と、空冷式熱交換器（３）の入口側の蒸気管（８）に接続され、蒸気管（８）内の蒸気圧力を検出する圧力計（１０）と、空冷式熱交換器（３）の出力側に接続され、空冷式熱交換器（３）内の蒸気を大気に放出して、蒸気圧力を調整する圧力調整ファン（１１）と、圧力調整ファン（１１）の吸引口側に接続され、外気を取り込むコック（１５）と、空冷式熱交換器（３）の入口側の蒸気管（８）に接続され、水を封入されているシールポット（１３）とを有し、
圧力計（１０）が大気圧を越えた蒸気管（８）内の蒸気圧力を検出したときに、その偏差に応じてコック（１５）の開度を調節し、圧力調整ファン（１１）の外気流入量を調整することによって、蒸気圧力を大気圧に調整し、また蒸気圧力がシールポット（１３）の水圧を越えたとき、蒸気管（８）内の蒸気を大気に放出することを特徴とする転炉排ガス冷却システム運転方法。 In the converter exhaust gas cooling system that cools the high-temperature exhaust gas generated in the converter (1) using the latent heat of vaporization of the cooling water in the cooling jacket (2), the steam generated in the cooling jacket (2) is condensed into the condensate. An air-cooled heat exchanger (3), a water supply path (4, 6, 5, 7) for supplying distilled water obtained by condensate as cooling water to the cooling jacket (2) for reuse, and an air-cooling type A pressure gauge (10) connected to the steam pipe (8) on the inlet side of the heat exchanger (3) and detecting the steam pressure in the steam pipe (8), and an output side of the air-cooled heat exchanger (3) Connected to the pressure adjusting fan (11) for releasing the steam in the air-cooled heat exchanger (3) to the atmosphere and adjusting the steam pressure, and to the suction port side of the pressure adjusting fan (11), Connected to the intake cock (15) and the steam pipe (8) on the inlet side of the air-cooled heat exchanger (3) Water and a seal pot (13) which is sealed,
When the pressure gauge (10) detects the steam pressure in the steam pipe (8) exceeding the atmospheric pressure, the opening of the cock (15) is adjusted according to the deviation, and the outside air of the pressure adjusting fan (11) By adjusting the amount of inflow, the steam pressure is adjusted to atmospheric pressure, and when the steam pressure exceeds the water pressure of the seal pot (13), the steam in the steam pipe (8) is released to the atmosphere. To operate the converter exhaust gas cooling system.
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CN103133067A (en) * 2013-03-15 2013-06-05 南京凯盛开能环保能源有限公司 Steel-mill residual blast-furnace gas and residual saturated steam comprehensive utilization power generation system
KR101275003B1 (en) * 2010-12-27 2013-06-14 재단법인 포항산업과학연구원 Staic cooler with advanced cooling efficiency
CN103343955A (en) * 2013-07-25 2013-10-09 南京凯盛开能环保能源有限公司 Comprehensive recycling boiler device of extra coal gas and saturated steam of steel plant
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CN106755718A (en) * 2016-12-12 2017-05-31 山西致业工程设计有限公司 The fume waste heat that pneumatic steelmaking is produced is utilized and dust removal integrated system and technique
CN113008046A (en) * 2021-03-10 2021-06-22 易门铜业有限公司 Accurate closed water-cooling heat exchange method

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CN113008046A (en) * 2021-03-10 2021-06-22 易门铜业有限公司 Accurate closed water-cooling heat exchange method

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