JP2009270183A - Cooling system for furnace body of blast furnace - Google Patents

Cooling system for furnace body of blast furnace Download PDF

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JP2009270183A
JP2009270183A JP2008124288A JP2008124288A JP2009270183A JP 2009270183 A JP2009270183 A JP 2009270183A JP 2008124288 A JP2008124288 A JP 2008124288A JP 2008124288 A JP2008124288 A JP 2008124288A JP 2009270183 A JP2009270183 A JP 2009270183A
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cooling water
cooling
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JP5422913B2 (en
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Masayuki Kitahara
北原雅之
Hiroshi Takeu
博 竹生
Hideaki Tsukiji
秀明 築地
Kazuro Niina
和朗 新名
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JFE Steel Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling system for furnace body of a blast furnace with which the cooling according to the variation of heat-loading in the furnace body of the blast furnace can be performed at a low cost. <P>SOLUTION: Based on the measured temperatures with a first block drainage-water thermometer 33, a second block drainage-water thermometer 34 and a third block to a fourth block drainage-water thermometer 35, the temperatures of the cooling waters drained from an upper part zone (the third block 13 and the fourth block 14) and a lower part zone (the first block 11 and the second block 12), are automatically controlled so as to be respectively proscribed temperature by adjusting the opening degrees of a first flowing rate adjusting valve 31 and a second flowing rate adjusting valve 32. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

本発明は、高炉炉体の冷却システムに関するものである。   The present invention relates to a cooling system for a blast furnace furnace body.

通常、高炉炉体の冷却は、鋳鉄製または銅製のクーリングステーブを用いて行われる。   Usually, cooling of the blast furnace body is performed using a cooling stave made of cast iron or copper.

その際に、特許文献１では、ヘッドタンクから供給された冷却水が、下降管、クーラー（熱交換器）、循環ポンプ、給水管を経てクーリングステーブ群を順次通過し、排水管を経てヘッドタンクに戻るという、冷却水循環型冷却システムが用いられている。   In that case, in Patent Document 1, the cooling water supplied from the head tank sequentially passes through the cooling stave group through the downcomer, the cooler (heat exchanger), the circulation pump, and the water supply pipe, and passes through the drain pipe and the head tank. A cooling water circulation type cooling system is used to return to

しかし、クーリングステーブの熱負荷は常に一定ではなく、時間によって変動するとともに、炉内部位によっても差がある。そのため、常時同一の冷却能力で冷却していると、緩冷却でよい部位（低熱負荷部位）を過大に冷却してしまって操業が不安定になったり、逆に冷却強化が必要な部位（高熱負荷部位）の冷却が不充分になって設備損傷を招いたりする危険性がある。   However, the heat load of the cooling staves is not always constant and varies with time, and also varies depending on the location in the furnace. For this reason, if cooling is always performed with the same cooling capacity, parts that require moderate cooling (low heat load parts) may be overcooled, resulting in unstable operation, or conversely, parts that require enhanced cooling (high heat There is a risk that the equipment will be damaged due to insufficient cooling of the load area.

そこで、特許文献２では、クーリングステーブを高炉の高さ方向で複数のゾーンに分割し、それぞれのゾーン毎に独立した冷却水循環型冷却系統を設け、それぞれの熱負荷に応じて冷却水の冷却能力を調整して、高炉炉体保護（冷却強化）と高炉操業安定（過冷却防止）を両立させるようにしている。
特開昭５０−０７４５０３号公報 特開昭５８−０１９４１５号公報 Therefore, in Patent Document 2, the cooling stave is divided into a plurality of zones in the height direction of the blast furnace, an independent cooling water circulation type cooling system is provided for each zone, and the cooling capacity of cooling water according to each heat load Are adjusted to achieve both blast furnace body protection (cooling enhancement) and blast furnace operation stability (overcooling prevention).
Japanese Patent Laid-Open No. 50-074503 JP 58-019415 A

しかし、特許文献２においては、クーリングステーブの複数のゾーン毎に独立した冷却水循環型冷却系統（熱交換器、循環ポンプ等）を設ける必要があるため、コストが高くなる。   However, in Patent Document 2, since it is necessary to provide an independent cooling water circulation type cooling system (heat exchanger, circulation pump, etc.) for each of a plurality of zones of the cooling stave, the cost increases.

本発明は、上記のような事情に鑑みてなされたものであり、高炉炉体の熱負荷の変動に応じた冷却を安価なコストで実施することができる高炉炉体冷却システム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 circumstances, and provides a blast furnace furnace cooling system capable of performing cooling according to fluctuations in the thermal load of the blast furnace furnace at an inexpensive cost. It is the purpose.

上記課題を解決するために、本発明は以下の特徴を有する。   In order to solve the above problems, the present invention has the following features.

［１］ヘッドタンク、熱交換器、循環ポンプ、クーリングステーブを管路により循環系として形成して、冷却水を循環・供給する高炉炉体冷却システムにおいて、
クーリングステーブが高炉の高さ方向に複数のゾーンに分割され、下部のゾーンから排水された冷却水を上部のゾーンに供給する管路と、下部のゾーンから排水された冷却水を上部のゾーンに供給せずにバイパスさせるバイパス管路とを備えているとともに、
前記熱交換器に供給する冷媒の流量を調節するための第１の流量調整弁と、下部のゾーンから排水された冷却水を上部のゾーンに供給する流量を調節するための第２の流量調整弁と、下部のゾーンから排水された冷却水の温度を測定するための下部ゾーン排水温度計と、上部のゾーンから排水された冷却水の温度を測定するための上部ゾーン排水温度計とを備え、
前記下部ゾーン排水温度計の測定温度と上部ゾーン排水温度計の測定温度に基づいて、前記第１の流量調整弁と第２の流量調整弁の開度を調節して、下部のゾーンから排水される冷却水の温度と上部のゾーンから排水される冷却水の温度が所定の温度となるように制御することを特徴とする高炉炉体冷却システム。 [1] In a blast furnace body cooling system in which a head tank, a heat exchanger, a circulation pump, and a cooling stave are formed as a circulation system by a pipe, and cooling water is circulated and supplied.
The cooling stave is divided into multiple zones in the height direction of the blast furnace, and a pipe that supplies cooling water drained from the lower zone to the upper zone and cooling water drained from the lower zone to the upper zone It has a bypass line that bypasses without supplying,
A first flow rate adjustment valve for adjusting the flow rate of the refrigerant supplied to the heat exchanger, and a second flow rate adjustment for adjusting the flow rate of supplying cooling water drained from the lower zone to the upper zone It has a valve, a lower zone drainage thermometer for measuring the temperature of the cooling water drained from the lower zone, and an upper zone drainage thermometer for measuring the temperature of the cooling water drained from the upper zone ,
Based on the measured temperature of the lower zone drainage thermometer and the measured temperature of the upper zone drainage thermometer, the opening of the first flow rate adjustment valve and the second flow rate adjustment valve is adjusted to drain the water from the lower zone. The blast furnace furnace cooling system is controlled such that the temperature of the cooling water and the temperature of the cooling water drained from the upper zone become a predetermined temperature.

［２］上記［１］において、下部のゾーンから排水された冷却水を上部のゾーンに供給する管路に流速計を備え、
前記流速計による測定流速が所定の流速値以上となるように第２の流量調整弁の開度を調整することを特長とする高炉炉体冷却システム。 [2] In the above [1], the pipe for supplying the cooling water drained from the lower zone to the upper zone is provided with an anemometer.
A blast furnace cooling system, characterized in that the opening of the second flow rate adjustment valve is adjusted so that the flow velocity measured by the anemometer is equal to or higher than a predetermined flow velocity value.

本発明においては、クーリングステーブの複数のゾーン毎に独立した冷却水循環型冷却系統（熱交換器、循環ポンプ等）を設置する必要はないので、高炉炉体の熱負荷の変動に応じた冷却を安価なコストで実施することができる。   In the present invention, it is not necessary to install an independent cooling water circulation type cooling system (heat exchanger, circulation pump, etc.) for each of a plurality of zones of the cooling stave, so cooling according to the fluctuation of the thermal load of the blast furnace furnace body is performed. It can be carried out at a low cost.

本発明の一実施形態を図面に基づいて説明する。   An embodiment of the present invention will be described with reference to the drawings.

図１は、本発明の一実施形態に係る高炉炉体冷却システムの全体配管図であり、図２は、その制御ブロック図である。   FIG. 1 is an overall piping diagram of a blast furnace furnace cooling system according to an embodiment of the present invention, and FIG. 2 is a control block diagram thereof.

図１、図２に示すように、この実施形態においては、高炉１０の炉体を冷却するために、ヘッドタンク１５、熱交換器１７、循環ポンプ１６、クーリングステーブ１１、１２、１３、１４を管路２１、２２、２３、２４、２５により循環系として形成して、冷却水を循環・供給するようになっている。   As shown in FIGS. 1 and 2, in this embodiment, in order to cool the furnace body of the blast furnace 10, a head tank 15, a heat exchanger 17, a circulation pump 16, and cooling staves 11, 12, 13, 14 are provided. It forms as a circulation system by the pipe lines 21, 22, 23, 24, 25, and circulates and supplies cooling water.

ここで、クーリングステーブは高炉の高さ方向に、下部ゾーン（第１ブロック１１、第２ブロック１２）と上部ゾーン（第３ブロック１３、第４ブロック１４）とに分割されており、ヘッドタンク１５から下部ゾーンの第１ブロック１１と第２ブロック１２に冷却水を供給する給水管路２１、２１ａ、２１ｂと、下部ゾーンの第１ブロック１１から排水された冷却水を上部ゾーンの第３ブロック１３と第４ブロック１４に供給する排給水管路２２、２２ａ、２２ｂと、上部ゾーンの第３ブロック１３と第４ブロック１４からの排水をヘッドタンク１５に戻す排水管路２３、２３ａ、２３ｂと、下部ゾーンの第１ブロック１１と第２ブロック１２から排水された冷却水を上部ゾーンに供給せずに給水管路２１に戻すバイパス管路２４、２５とを備えている。なお、図１中の１９は、冷却水を補給するために設けられている冷却水補給タンクである。   Here, the cooling stave is divided into a lower zone (first block 11 and second block 12) and an upper zone (third block 13 and fourth block 14) in the height direction of the blast furnace. Water supply pipelines 21, 21a, 21b for supplying cooling water to the first block 11 and the second block 12 in the lower zone, and the cooling water drained from the first block 11 in the lower zone to the third block 13 in the upper zone And drain water supply lines 22, 22a, 22b for supplying to the fourth block 14, and drain lines 23, 23a, 23b for returning the waste water from the third block 13 and the fourth block 14 in the upper zone to the head tank 15, Bypass pipes 24 and 25 for returning the cooling water drained from the first block 11 and the second block 12 in the lower zone to the water supply pipe 21 without supplying the cooling water to the upper zone. Eteiru. In addition, 19 in FIG. 1 is a cooling water supply tank provided in order to supply cooling water.

さらに、熱交換器１７に供給する冷媒（冷却水）の流量を調節するために冷媒供給管路２９に設置された第１流量調整弁３１と、第１ブロック１１から排水された冷却水を第３ブロック１３と第４ブロック１４に供給する流量を調節するためにバイパス管路２４に設置された第２流量調整弁３２と、第１ブロック１１から排水された冷却水の温度を測定するために排給水管路２２に設けられた第１ブロック排水温度計３３と、第２ブロック１２から排水された冷却水の温度を測定するために排給水管路２５に設けられた第２ブロック排水温度計３４と、第３ブロック１３から排水された冷却水と第４ブロック１４から排水された冷却水が混合した後の温度を測定するために排水管路２３に設けられた第３ブロック・第４ブロック排水温度計３５とを備えている。   Furthermore, in order to adjust the flow rate of the refrigerant (cooling water) supplied to the heat exchanger 17, the first flow rate adjusting valve 31 installed in the refrigerant supply pipe 29 and the cooling water drained from the first block 11 In order to measure the temperature of the cooling water discharged from the first block 11 and the second flow rate adjustment valve 32 installed in the bypass line 24 to adjust the flow rate supplied to the third block 13 and the fourth block 14. A first block drainage thermometer 33 provided in the drainage water pipeline 22 and a second block drainage thermometer provided in the drainage water pipeline 25 to measure the temperature of the cooling water drained from the second block 12. 34 and the third block and the fourth block provided in the drain line 23 for measuring the temperature after the cooling water drained from the third block 13 and the cooling water drained from the fourth block 14 are mixed. Waste water thermometer 3 It is equipped with a door.

そして、第１ブロック排水温度計３３、第２ブロック排水温度計３４、第３ブロック・第４ブロック排水温度計３５の測定温度に基づいて、第１流量調整弁３１と第２流量調整弁３２の開度を調節して、上部ゾーン（第３ブロック１３、第４ブロック１４）から排水される冷却水の温度が所定の温度（例えば、７０℃〜８０℃）となり、下部ゾーン（第１ブロック１１、第２ブロック１２）から排水される冷却水の温度も所定の温度（例えば、６０℃〜７０℃）となるように自動制御する。   Based on the measured temperatures of the first block drainage thermometer 33, the second block drainage thermometer 34, and the third block / fourth block drainage thermometer 35, the first flow rate adjustment valve 31 and the second flow rate adjustment valve 32 By adjusting the opening degree, the temperature of the cooling water drained from the upper zone (the third block 13 and the fourth block 14) becomes a predetermined temperature (for example, 70 ° C. to 80 ° C.), and the lower zone (the first block 11). The temperature of the cooling water drained from the second block 12) is automatically controlled so as to be a predetermined temperature (for example, 60 ° C. to 70 ° C.).

例えば、上部ゾーン（第３ブロック１３、第４ブロック１４）の排水温度計３５の測定温度が８０℃以上であると、第２の流量調整弁３２の開度を調節して、上部ゾーンに供給する冷却水の量を多くすることによって、上部ゾーン（第３ブロック１３、第４ブロック１４）の排水温度計３５の測定温度が８０℃を超えないように自動制御する。   For example, when the measured temperature of the drainage thermometer 35 in the upper zone (the third block 13 and the fourth block 14) is 80 ° C. or higher, the opening degree of the second flow rate adjustment valve 32 is adjusted and supplied to the upper zone. By increasing the amount of cooling water to be performed, the temperature of the drainage thermometer 35 in the upper zone (the third block 13 and the fourth block 14) is automatically controlled so as not to exceed 80 ° C.

また、下部ゾーン（第１ブロック１１、第２ブロック１２）の排水温度計３３、３４の測定温度が７０℃以上であると、第１の流量調整弁３１の開度を調節して、熱交換器１７に供給する冷媒（冷却水）の量を多くすることによって、下部ブロックに供給する冷却水の温度を下げて、下部ゾーンの排水温度計３３、３４の測定温度が７０℃を超えないように自動制御する。   When the measured temperature of the drainage thermometers 33 and 34 in the lower zone (the first block 11 and the second block 12) is 70 ° C. or higher, the opening degree of the first flow rate adjustment valve 31 is adjusted to perform heat exchange. By increasing the amount of coolant (cooling water) supplied to the vessel 17, the temperature of the cooling water supplied to the lower block is lowered so that the measured temperature of the drainage thermometers 33 and 34 in the lower zone does not exceed 70 ° C. To automatically control.

なお、第２流量調整弁３２については、第１ブロック１１から上部ゾーンへの排給水管路２２に設けた流速計３７とも連結し、冷却水中の気泡除去と冷却水の蒸発防止のために、排給水管路２３内の流速が一定以上の値（例えば、０．５m／ｓ以上）になるように自動制御することが好ましい。   In addition, about the 2nd flow regulating valve 32, it connects also with the velocimeter 37 provided in the discharge water conduit 22 from the 1st block 11 to an upper zone, in order to remove the bubble in cooling water and to prevent evaporation of cooling water, It is preferable that automatic control is performed so that the flow velocity in the drain water supply pipe 23 becomes a certain value or more (for example, 0.5 m / s or more).

このようにして、この実施形態においては、第１ブロック排水温度計３３、第２ブロック排水温度計３４、第３ブロック・第４ブロック排水温度計３５の測定温度に基づいて、第１流量調整弁３１と第２流量調整弁３２の開度を調節して、上部ゾーン（第３ブロック１３、第４ブロック１４）および下部ゾーン（第１ブロック１１、第２ブロック１２）から排水される冷却水の温度がそれぞれ所定の温度になるように自動制御している。そのため、従来技術（特許文献２）のように、複数のゾーン毎に独立した冷却水循環型冷却系統（熱交換器、循環ポンプ等）を設置する必要がなく、高炉炉体の熱負荷の変動に応じて、高炉炉体保護（冷却強化）と高炉操業安定（過冷却防止）を両立させながらの高炉炉体の冷却を安価なコストで実施することができる。   Thus, in this embodiment, based on the measured temperatures of the first block drainage thermometer 33, the second block drainage thermometer 34, the third block / fourth block drainage thermometer 35, the first flow rate adjusting valve 31 and adjusting the opening of the second flow rate adjusting valve 32, cooling water discharged from the upper zone (third block 13, fourth block 14) and the lower zone (first block 11, second block 12). The temperature is automatically controlled so as to reach a predetermined temperature. Therefore, unlike the prior art (Patent Document 2), there is no need to install independent cooling water circulation type cooling systems (heat exchangers, circulation pumps, etc.) for each of a plurality of zones, and fluctuations in the thermal load of the blast furnace furnace body Accordingly, cooling of the blast furnace body can be carried out at a low cost while achieving both blast furnace body protection (cooling enhancement) and blast furnace operation stability (overcooling prevention).

なお、上記の実施形態においては、クーリングステーブを上部ゾーンおよび下部ゾーンの２個のゾーンに分割したが、必要に応じて、３個以上のゾーンに分割してもよい。   In the above embodiment, the cooling stave is divided into two zones, an upper zone and a lower zone, but may be divided into three or more zones as necessary.

本発明の一実施形態に係る高炉炉体冷却システムの全体配管図である。1 is an overall piping diagram of a blast furnace furnace cooling system according to an embodiment of the present invention. 本発明の一実施形態に係る高炉炉体冷却システムの制御ブロック図である。It is a control block diagram of a blast furnace furnace cooling system according to an embodiment of the present invention.

符号の説明Explanation of symbols

１０ 高炉
１１ クーリングステーブの第１ブロック
１２ クーリングステーブの第２ブロック
１３ クーリングステーブの第３ブロック
１４ クーリングステーブの第４ブロック
１５ ヘッドタンク
１６ 循環ポンプ
１７ 熱交換器
１９ 冷却水補給タンク
２１、２１ａ、２１ｂ 給水管路
２２、２２ａ、２２ｂ 排給水管路
２３、２３ａ、２３ｂ 排水管路
２４ バイパス管路
２５ バイパス管路
２９ 冷媒供給管路
３１ 第１流量調整弁
３２ 第２流量調整弁
３３ 第１ブロック排水温度計
３４ 第２ブロック排水温度計
３５ 第３ブロック・第４ブロック排水温度計
３７ 流速計 DESCRIPTION OF SYMBOLS 10 Blast furnace 11 1st block of cooling stave 12 2nd block of cooling stave 13 3rd block of cooling stave 14 4th block of cooling stave 15 Head tank 16 Circulation pump 17 Heat exchanger 19 Cooling water supply tank 21, 21a, 21b Water supply pipeline 22, 22a, 22b Drain supply pipeline 23, 23a, 23b Drain pipeline 24 Bypass pipeline 25 Bypass pipeline 29 Refrigerant supply pipeline 31 First flow rate adjustment valve 32 Second flow rate adjustment valve 33 First block drainage Thermometer 34 Second block drainage thermometer 35 Third block / fourth block drainage thermometer 37 Current meter

Claims (2)

ヘッドタンク、熱交換器、循環ポンプ、クーリングステーブを管路により循環系として形成して、冷却水を循環・供給する高炉炉体冷却システムにおいて、
クーリングステーブが高炉の高さ方向に複数のゾーンに分割され、下部のゾーンから排水された冷却水を上部のゾーンに供給する管路と、下部のゾーンから排水された冷却水を上部のゾーンに供給せずにバイパスさせるバイパス管路とを備えているとともに、
前記熱交換器に供給する冷媒の流量を調節するための第１の流量調整弁と、下部のゾーンから排水された冷却水を上部のゾーンに供給する流量を調節するための第２の流量調整弁と、下部のゾーンから排水された冷却水の温度を測定するための下部ゾーン排水温度計と、上部のゾーンから排水された冷却水の温度を測定するための上部ゾーン排水温度計とを備え、
前記下部ゾーン排水温度計の測定温度と上部ゾーン排水温度計の測定温度に基づいて、前記第１の流量調整弁と第２の流量調整弁の開度を調節して、下部のゾーンから排水される冷却水の温度と上部のゾーンから排水される冷却水の温度が所定の温度となるように制御することを特徴とする高炉炉体冷却システム。 In the blast furnace furnace cooling system, a head tank, heat exchanger, circulation pump, and cooling stave are formed as a circulation system by pipes to circulate and supply cooling water.
The cooling stave is divided into multiple zones in the height direction of the blast furnace, and a pipe that supplies cooling water drained from the lower zone to the upper zone and cooling water drained from the lower zone to the upper zone It has a bypass line that bypasses without supplying,
A first flow rate adjustment valve for adjusting the flow rate of the refrigerant supplied to the heat exchanger, and a second flow rate adjustment for adjusting the flow rate of supplying cooling water drained from the lower zone to the upper zone It has a valve, a lower zone drainage thermometer for measuring the temperature of the cooling water drained from the lower zone, and an upper zone drainage thermometer for measuring the temperature of the cooling water drained from the upper zone ,
Based on the measured temperature of the lower zone drainage thermometer and the measured temperature of the upper zone drainage thermometer, the opening of the first flow rate adjustment valve and the second flow rate adjustment valve is adjusted to drain the water from the lower zone. The blast furnace furnace cooling system is controlled such that the temperature of the cooling water and the temperature of the cooling water drained from the upper zone become a predetermined temperature. 下部のゾーンから排水された冷却水を上部のゾーンに供給する管路に流速計を備え、
前記流速計による測定流速が所定の流速値以上となるように第２の流量調整弁の開度を調整することを特長とする請求項１に記載の高炉炉体冷却システム。 The pipe that supplies cooling water drained from the lower zone to the upper zone is equipped with an anemometer,
2. The blast furnace body cooling system according to claim 1, wherein the opening degree of the second flow rate adjustment valve is adjusted so that a flow rate measured by the anemometer is equal to or higher than a predetermined flow rate value.
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TWI657144B (en) * 2018-05-28 2019-04-21 中國鋼鐵股份有限公司 Blast furnace furnace cooling system
CN109880952A (en) * 2019-03-29 2019-06-14 北京科技大学 A kind of water pipe structure of the method that cooling water pipe is distributed rationally and uniform divided flows
KR20210074881A (en) * 2019-12-12 2021-06-22 주식회사 포스코건설 Cooling process control method of cooling facility for melting furnace and cooling facility using the same

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Publication number Priority date Publication date Assignee Title
JP2013071061A (en) * 2011-09-28 2013-04-22 Jfe Steel Corp Method for increasing permeation flow rate of membrane filtration module
TWI657144B (en) * 2018-05-28 2019-04-21 中國鋼鐵股份有限公司 Blast furnace furnace cooling system
CN109880952A (en) * 2019-03-29 2019-06-14 北京科技大学 A kind of water pipe structure of the method that cooling water pipe is distributed rationally and uniform divided flows
CN109880952B (en) * 2019-03-29 2020-09-11 北京科技大学 Method for optimizing configuration of cooling water pipe and water pipe structure capable of uniformly distributing flow
KR20210074881A (en) * 2019-12-12 2021-06-22 주식회사 포스코건설 Cooling process control method of cooling facility for melting furnace and cooling facility using the same
KR102335753B1 (en) 2019-12-12 2021-12-07 주식회사 포스코건설 Cooling process control method of cooling facility for melting furnace and cooling facility using the same

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