JPH08302409A - Method for treating blast furnace gas - Google Patents
Method for treating blast furnace gasInfo
- Publication number
- JPH08302409A JPH08302409A JP7128815A JP12881595A JPH08302409A JP H08302409 A JPH08302409 A JP H08302409A JP 7128815 A JP7128815 A JP 7128815A JP 12881595 A JP12881595 A JP 12881595A JP H08302409 A JPH08302409 A JP H08302409A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- dust collector
- blast furnace
- furnace gas
- wet
- 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.)
- Granted
Links
Classifications
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Blast Furnaces (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、湿式集塵装置と乾式集
塵装置を並列に設けた高炉ガス清浄設備において、該乾
式集塵装置で高炉ガスを二次集塵処理している際に、湿
式集塵装置へ供給する集塵用給水量の調整方法に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blast furnace gas cleaning facility in which a wet dust collector and a dry dust collector are provided in parallel, when the blast furnace gas is subjected to secondary dust collection processing by the dry dust collector. The present invention relates to a method for adjusting the amount of dust collection water supplied to the wet dust collector.
【０００２】[0002]
【従来の技術】従来より、高炉から発生するガスの如く
高温高圧ガスから圧力および熱エネルギーを積極的に回
収し、省エネルギーを図ろうとする動きが活発である。
前者の圧力を回収する設備としては炉頂圧力回収発電設
備があり、後者の熱エネルギーの利用としては従来の湿
式集塵装置にガスを通すことによって生ずる温度低下を
防止するために乾式集塵装置を設置し、その排ガスの有
する熱エネルギーを炉頂圧力回収発電設備で回収するも
のがある。2. Description of the Related Art Conventionally, there have been active movements to actively recover pressure and thermal energy from high-temperature high-pressure gas such as gas generated from a blast furnace to save energy.
The former pressure recovery equipment is the furnace top pressure recovery power generation equipment, and the latter heat energy utilization is a dry dust collector to prevent temperature drop caused by passing gas through a conventional wet dust collector. Is installed and the thermal energy of the exhaust gas is recovered by the furnace top pressure recovery power generation facility.
【０００３】ところが、高炉から発生するガス中のダス
トを取り除く装置としての乾式集塵装置は、信頼性に問
題が残る。その問題とは、通常二次乾式集塵装置に用い
られるバグフィルターの耐熱温度が、通常２００〜３０
０℃程度であること、およびバグフィルターの通過ガス
流速の設計条件としては、経済性を考慮して高炉吹抜け
等の異常時に発生する多量のガスを処理するだけの、内
容積を有していない事である。However, the reliability of the dry dust collector as a device for removing dust in the gas generated from the blast furnace remains a problem. The problem is that the heat resistance temperature of the bag filter used in the secondary dry dust collector is usually 200 to 30.
As for the design conditions of 0 ° C and the flow rate of gas passing through the bag filter, considering the economic efficiency, it does not have an internal volume sufficient to process a large amount of gas generated at the time of abnormalities such as blast furnace blow-through. It is a thing.
【０００４】これらの問題を解決するため、例えば、特
公平６−１９０９５号公報に開示されている様に、高炉
ガス清浄ラインに前記二次乾式集塵装置と、湿式集塵装
置を並列に設置し、この両集塵装置を切替弁により切替
え可能にしておき、通常の高炉操業状態においては、二
次乾式集塵装置で高炉ガスを処理し、高炉の吹抜け等の
異常によりガス温度やガス量が急上昇した場合において
は、前記切替弁の操作により湿式集塵装置に切替えて高
炉ガスを処理することで、前記問題となるガス温度、ガ
ス容積の急上昇などに対応するものである。In order to solve these problems, for example, as disclosed in Japanese Patent Publication No. 6-19095, the secondary dry dust collector and the wet dust collector are installed in parallel in the blast furnace gas cleaning line. However, both dust collectors can be switched by a switching valve.In normal blast furnace operating conditions, the blast furnace gas is processed by the secondary dry dust collector, and the gas temperature and gas amount due to abnormalities such as blow-by of the blast furnace. In the case of a sudden rise in temperature, the switching valve is operated to switch to the wet dust collector to process the blast furnace gas, thereby responding to the gas temperature, the gas volume, etc., which are the above problems.
【０００５】[0005]
【本発明が解決しようとする課題】前記の、高炉ガスの
清浄ラインは、その配管径が通常１．５ｍ以上と比較的
大きいことから、前記切替弁には通常バタ弁が用いられ
ている。そのため、該切替弁を長期間使用すると、シ−
ル部が劣化して高炉ガスがリークする。さらに、リーク
ガス中のダストによる磨耗作用により該切替弁の劣化が
進み、次第にそのリーク量も多くなる。そして、湿式集
塵装置からリークする高炉ガスが許容量以上のダストを
含有している場合には、炉頂圧力回収発電設備を損傷す
る原因となる。In the above-mentioned blast furnace gas cleaning line, the pipe diameter is usually as large as 1.5 m or more, so that the switching valve is usually a flap valve. Therefore, if the switching valve is used for a long period of time,
And the blast furnace gas leaks. Furthermore, the wear of dust in the leak gas causes the switching valve to deteriorate, and the leak amount gradually increases. If the blast furnace gas leaking from the wet dust collector contains dust in an amount more than the allowable amount, it will cause damage to the furnace top pressure recovery power generation equipment.
【０００６】しかし、この切替弁からのリークを測定す
る実用的な手段がないことから、リークした高炉ガスの
ダスト濃度が、炉頂圧力回収発電設備の許容値以内であ
るか否かの判断は困難であった。そこで、高炉ガスを二
次乾式集塵装置で処理している場合においても、湿式集
塵装置に集塵用水を常に供給することで、リ−クした高
炉ガス中のダストを除去する必要があり、その給水量は
安全代を見込んで湿式集塵装置で高炉ガスを全量処理し
ている場合と略同程度のものであった。本発明は二次乾
式集塵装置で高炉ガスを処理している場合において、炉
頂圧力回収発電設備に流入する高炉ガス中のダストを上
昇すること無く、湿式集塵装置への集塵用給水量を低減
することを課題とするものである。However, since there is no practical means for measuring the leak from the switching valve, it is not possible to judge whether the dust concentration of the leaked blast furnace gas is within the allowable value of the furnace top pressure recovery power generation facility. It was difficult. Therefore, even when the blast furnace gas is treated by the secondary dry dust collector, it is necessary to remove the dust in the leaked blast furnace gas by constantly supplying the water for dust collection to the wet dust collector. The amount of water supplied was about the same as when the entire amount of blast furnace gas was treated by the wet dust collector in anticipation of a safety margin. The present invention, when the blast furnace gas is treated by the secondary dry dust collector, does not raise dust in the blast furnace gas flowing into the furnace top pressure recovery power generation facility, and supplies water for collecting dust to the wet dust collector. The problem is to reduce the amount.
【０００７】[0007]
【課題を解決するための手段】本発明は、上記課題を解
決するためになされたものであり、その手段は、一次乾
式集塵装置と炉頂圧力回収発電装置の間のガス配管を２
系統に分岐した後、再び１つのガス配管に集合し、前記
２系統に分岐した分岐ガス配管の一方に湿式集塵装置を
設けると共に他方の分岐ガス配管に二次乾式集塵装置を
設け、前記一次乾式集塵装置で高炉ガスを一次集塵処理
し、更に、前記湿式集塵装置又は二次乾式集塵装置のい
ずれかで二次集塵処理した後、前記炉頂圧力回収発電装
置で高炉ガスの有するエネルギ−を回収する高炉ガスの
処理方法において、前記湿式集塵装置側系統を仕切り、
前記二次乾式集塵装置で高炉ガスを二次集塵処理してい
る際に、該二次乾式集塵装置の出側分岐ガス配管及び湿
式集塵装置の出側分岐ガス配管内の高炉ガス温度Ｔａ、
Ｔｃを各々測定すると共に前記分岐ガス配管の集合点か
ら前記炉頂圧力回収発電装置間のガス配管内の高炉ガス
温度Ｔｂを測定し、この各測定高炉ガス温度を基に上記
（１）式により前記湿式集塵装置から前記炉頂圧力回収
発電装置に漏洩する高炉ガスの漏洩率αを求め、該漏洩
率αにより前記湿式集塵装置へ供給する集塵用給水量を
調整して該炉頂圧力回収発電装置に流入する高炉ガス中
のダスト濃度を所定値以下に維持する高炉ガスの処理方
法である。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its means is to provide a gas pipe between a primary dry dust collector and a furnace top pressure recovery power generator.
After branching into the system, the gas lines are collected again into one gas pipe, a wet dust collector is provided on one of the branch gas pipes branched to the two systems, and a secondary dry dust collector is provided on the other branch gas pipe. The blast furnace gas is subjected to a primary dust collection process by a primary dry type dust collector, and further, a secondary dust collection process is performed by either the wet type dust collector or the secondary dry type dust collector, and then the blast furnace is collected by the furnace top pressure recovery power generator. In the method of treating blast furnace gas for recovering energy of gas, the wet dust collector side system is partitioned,
During the secondary dust collecting process of the blast furnace gas by the secondary dry dust collector, the blast furnace gas in the outlet side branch gas pipe of the secondary dry dust collector and the outlet side branch gas pipe of the wet dust collector Temperature Ta,
Each Tc is measured and the blast furnace gas temperature Tb in the gas pipe between the furnace top pressure recovery power generators is measured from the confluence point of the branch gas pipes. Based on each measured blast furnace gas temperature, the above formula (1) is used. The leak rate α of the blast furnace gas leaking from the wet dust collector to the furnace top pressure recovery power generator is determined, and the amount of dust collecting water supplied to the wet dust collector is adjusted by the leak rate α to adjust the furnace top. It is a method for treating blast furnace gas, which maintains a dust concentration in the blast furnace gas flowing into a pressure recovery power generator at a predetermined value or less.
【０００８】[0008]
【作用】以下、本発明の作用を図１を参照して説明す
る。本発明者らは、切替弁１０からリ−クする高炉ガス
流出量を求め、このガス流出量に応じて湿式集塵装置に
供給する集塵用水量をコントロ−ルするため、下記〜
の事項に着目した。 乾式集塵装置３ａを経て炉頂圧力回収発電設備５に流
入する高炉ガスは、高温で９０℃〜２００℃であり、そ
かも、その間の温度低下はガス配管からの放散熱のみで
約１℃程度であり、該ガス配管内を流れるガス温度は殆
ど変化しない。The operation of the present invention will be described below with reference to FIG. The inventors of the present invention obtain the outflow amount of blast furnace gas leaked from the switching valve 10 and control the amount of water for dust collection supplied to the wet dust collector according to the outflow amount of gas.
I focused on the item. The blast furnace gas flowing into the furnace top pressure recovery power generation facility 5 through the dry dust collector 3a has a high temperature of 90 ° C to 200 ° C, and the temperature drop during that time is about 1 ° C only due to the heat released from the gas pipe. The temperature of the gas flowing in the gas pipe hardly changes.
【０００９】湿式集塵装置を通過した高炉ガス温度
は、４０℃〜６０℃程度で比較的低温である。 前記との高炉ガスは合流して炉頂圧力回収発電設
備５に流入することから、両高炉ガスの合流点から炉頂
圧力回収発電設備５にまでの高炉ガスの温度が、湿式集
塵装置から流出した高炉ガス量、すなわち、切替弁１０
からのリーク率に応じて低下する。The temperature of the blast furnace gas passing through the wet dust collector is about 40 ° C. to 60 ° C., which is a relatively low temperature. Since the above blast furnace gases merge and flow into the furnace top pressure recovery power generation equipment 5, the temperature of the blast furnace gas from the confluence point of both blast furnace gases to the furnace top pressure recovery power generation equipment 5 changes from the wet dust collector. Amount of blast furnace gas that has flowed out, that is, switching valve 10
It decreases according to the leak rate from.
【００１０】このことから、二次乾式集塵３ａ装置出側
の高炉ガス温度、湿式集塵装置４ａ出側の高炉ガス温
度、ガス配管の集合点から炉頂圧力回収発電設備５の間
の高炉ガス温度を各々測定し、この測定値を基に、前記
切替弁１０からリーク率を算出し、この算出リーク率に
応じて湿式集塵装置としてのベンチュリスクラバー４ａ
に供給する集塵用給水量を調整することで、該ベンチュ
リスクラバー４ａに高炉ガスに随伴して流入するダスト
を除去するに必要な水量を供給することが可能となり、
不必要な水を供給することが無くなり、給水ポンプ７の
消費電力を最小限にする事ができるものである。From these facts, the blast furnace gas temperature on the outlet side of the secondary dry dust collector 3a, the blast furnace gas temperature on the outlet side of the wet dust collector 4a, and the blast furnace between the collection point of the gas pipes and the furnace top pressure recovery power generation facility 5 The gas temperature is measured, the leak rate is calculated from the switching valve 10 based on the measured value, and the venturi scrubber 4a as a wet dust collector is calculated according to the calculated leak rate.
By adjusting the amount of water for dust collection supplied to the Venturi scrubber 4a, it becomes possible to supply the amount of water necessary to remove the dust flowing along with the blast furnace gas,
Since unnecessary water is not supplied, the power consumption of the water supply pump 7 can be minimized.
【００１１】[0011]
【実施例】本発明での実施の例は図１と同様であるので
これをもとに詳細に説明する。本例に使用した高炉は、
内容積４８８４ｍ3 、送風量７４００Ｎｍ3 ／分、送風
湿分１５ｇ／Ｎｍ3 、酸素富化量６０００Ｎｍ3 ／時
間、微分炭吹込み量１４０ｋｇ／ｔ−ｐｉｇ、出銑量１
１３００ｔ／日、高炉ガス量６５４千Ｎｍ3/時間であ
る。図１中に示すように、高炉１の炉頂には上昇管１
ａ、下降管１ｂを順次介して１次乾式集塵装置であるダ
ストキャッチャー２が接続され、次いで、このダストキ
ャッチャー２からのガス配管は２系統に分岐し、一方の
分岐ガス配管４には湿式集塵装置としてのベンチュリス
クラバ−４ａ、切替弁１０を順次介設し、他方の分岐ガ
ス配管３には入口弁９ａ、２次乾式集塵装置としてのバ
グフィルター３ａ、出口弁９ｂを順次介設している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention is similar to that of FIG. 1 and will be described in detail based on this. The blast furnace used in this example is
Inner volume 4884m 3 , blast amount 7400Nm 3 / min, blast humidity 15g / Nm 3 , oxygen enrichment 6000Nm 3 / hour, differential coal injection rate 140kg / t-pig, tapping rate 1
The amount of blast furnace gas is 1300 t / day and 654,000 Nm 3 / hour. As shown in FIG. 1, a rising pipe 1 is provided at the top of the blast furnace 1.
The dust catcher 2, which is a primary dry dust collector, is connected through a and the descending pipe 1b in order, and then the gas pipe from this dust catcher 2 is branched into two systems, and one of the branch gas pipes 4 is wet type. A venturi scrubber-4a as a dust collector and a switching valve 10 are sequentially provided, and an inlet valve 9a and a bag filter 3a as a secondary dry dust collector and an outlet valve 9b are sequentially provided at the other branch gas pipe 3. are doing.
【００１２】通常の高炉操業状態である場合は、入口弁
９ａ及び出口弁９ｂを開放し、切替弁１０を閉鎖して、
ダストキャッチャー２からの高炉ガスをバグフィルター
３ａに供給して集塵処理する。しかし、前述のように高
炉に異常が発生し、高炉ガス温度、ガス量が異常に上昇
した場合等には上記入口弁９ａ及び出口弁９ｂを閉鎖
し、切替弁１０を開放して、高炉ガスをベンチュリスク
ラバ−４ａに供給している。さらに、バグフィルター３
ａからの分岐ガス配管３とベンチュリスクラバ−４ａか
らの分岐ガス配管４は下流側のＡ点において再び合流し
て集合ガス配管１７となる。In a normal blast furnace operating state, the inlet valve 9a and the outlet valve 9b are opened and the switching valve 10 is closed,
Blast furnace gas from the dust catcher 2 is supplied to the bag filter 3a for dust collection. However, as described above, when an abnormality occurs in the blast furnace and the blast furnace gas temperature and the gas amount increase abnormally, the inlet valve 9a and the outlet valve 9b are closed, the switching valve 10 is opened, and the blast furnace gas is opened. To Venturi Scrubber-4a. In addition, bug filter 3
The branch gas pipe 3 from a and the branch gas pipe 4 from the venturi scrubber-4a merge again at point A on the downstream side to form a collective gas pipe 17.
【００１３】そして、この集合ガス配管１７は再び分岐
し、一方の分岐ガス配管１８に開閉弁１５、炉頂圧力回
収発電設備５、開閉弁１６を順次介設し、他方の分岐ガ
ス配管１８には開閉弁１４を介設している。このバグフ
ィルター３ａの出側分岐ガス配管３、ベンチュリスクラ
バ−４ａの出側分岐ガス配管４、集合点Ａから炉頂圧力
回収発電設備５に至る分岐ガス配管１８には高炉ガス温
度を測定するガス温度計１２ａ〜１２ｃを設けている。
また、前記湿式集塵装置のベンチュリスクラバー４ａ、
４ｂに集塵用水を供給する循環系統１１には、冷却水の
貯留タンク６、給水ポンプ７、給水弁８が直列に接続し
ている。Then, the collective gas pipe 17 is branched again, and the on-off valve 15, the furnace top pressure recovery power generation facility 5, and the on-off valve 16 are sequentially provided on one branch gas pipe 18, and the other branch gas pipe 18 is provided. Is provided with an on-off valve 14. The outlet branch gas pipe 3 of the bag filter 3a, the outlet branch gas pipe 4 of the venturi scrubber-4a, and the branch gas pipe 18 from the collection point A to the furnace top pressure recovery power generation facility 5 are used for measuring the blast furnace gas temperature. Thermometers 12a to 12c are provided.
In addition, the venturi scrubber 4a of the wet dust collector,
A circulation water storage tank 6, a water supply pump 7, and a water supply valve 8 are connected in series to a circulation system 11 that supplies the water for collecting dust to 4b.
【００１４】データ処理用の制御演算装置１３は、ベン
チュリスクラバー４ｂの出口側に設けた遮断弁１０のリ
ーク率αを演算し、その結果を基にベンチュリスクラバ
ー４ｂへの集塵用水量を調整するもので、リーク率演算
部１３ａ、湿式集塵装置給水量調整部１３ｂから構成さ
れている。ベンチュリスクラバー４ｂへの給水量は、給
水ポンプ７の給水能力および給水弁８の開度によって調
節する。前記リーク率演算部１３ａは、前記ガス温度計
１２ａ〜１２ｃの測定値Ｔａ、Ｔｂ、Ｔｃを逐次入力
し、下記（１）式により切替弁１０からのリーク率αを
逐次算出する。The control processor 13 for data processing calculates the leak rate α of the shut-off valve 10 provided on the outlet side of the venturi scrubber 4b, and adjusts the amount of dust collecting water to the venturi scrubber 4b based on the result. It is composed of a leak rate calculation unit 13a and a wet dust collector water supply amount adjustment unit 13b. The amount of water supplied to the venturi scrubber 4b is adjusted by the water supply capacity of the water supply pump 7 and the opening degree of the water supply valve 8. The leak rate calculation unit 13a sequentially inputs the measured values Ta, Tb, and Tc of the gas thermometers 12a to 12c, and sequentially calculates the leak rate α from the switching valve 10 by the following equation (1).
【００１５】[0015]
【数２】 [Equation 2]
【００１６】ただし、Ｃｐは高炉ガス比熱、γはミスト
の蒸発潜熱、ηはミストの蒸発率である。また、Ｗは湿
式集塵装置の出側における高炉ガス中のミスト含有量
〔ｇ／Ｎｍ3 〕であり、過去に高炉ガスをサンプリング
して求めた値の最大値であり、これらはいずれも設定器
１３ｃより設定する。Where Cp is the specific heat of the blast furnace gas, γ is the latent heat of vaporization of mist, and η is the evaporation rate of mist. W is the mist content [g / Nm 3 ] in the blast furnace gas on the outlet side of the wet dust collector, which is the maximum value obtained by sampling the blast furnace gas in the past, and these are all set. Set from the instrument 13c.
【００１７】また、前記湿式集塵装置給水量制御部１３
ｂは、まず、下記（２）式によって炉頂圧力回収発電設
備５の入口側含塵濃度Ｄを演算する。 Ｄ＝Ｄｄ×（１−α／１００) ＋Ｄｗ×α／１００ ・・・（２） ここで、Ｄｄは乾式ガス清浄設備３ａ出側における高炉
ガスをサンプリングして求めたダスト濃度である。ま
た、Ｄｗは湿式集塵装置出側の高炉ガスをサンプリング
して求めたダスト濃度である。The wet dust collector water supply amount control unit 13
For b, first, the dust concentration D on the inlet side of the furnace top pressure recovery power generation facility 5 is calculated by the following equation (2). D = Dd × (1−α / 100) + Dw × α / 100 (2) Here, Dd is the dust concentration obtained by sampling the blast furnace gas on the outlet side of the dry gas cleaning equipment 3a. Dw is the dust concentration obtained by sampling the blast furnace gas on the outlet side of the wet dust collector.
【００１８】次に、湿式集塵装置の集塵用水量設定値に
ついて詳細に説明する。切替弁１０のリーク率αと炉頂
圧力回収発電設備５の入口側の含塵濃度の関係を図２に
示す（図中の線はベンチュリスクラバー４ｂへの給水量
と表す）。この含塵濃度の許容値は、該炉頂圧力回収発
電設備５のタービン翼の材質によって決定され、本実施
例では５ｍｇ／Ｎｍ3 である。常にこの許容値を満足す
るように、前記切替弁１０にリークが生じた場合でもベ
ンチュリスクラバー４ａ、４ｂに集塵用水を供給する。Next, the set value of the amount of water for dust collection of the wet dust collector will be described in detail. The relationship between the leak rate α of the switching valve 10 and the dust concentration on the inlet side of the furnace top pressure recovery power generation facility 5 is shown in FIG. 2 (the line in the figure represents the amount of water supplied to the venturi scrubber 4b). The permissible value of this dust concentration is determined by the material of the turbine blade of the furnace top pressure recovery power generation facility 5, and is 5 mg / Nm 3 in this embodiment. Even if a leak occurs in the switching valve 10, dust collecting water is supplied to the venturi scrubbers 4a and 4b so that the allowable value is always satisfied.
【００１９】すなわち、図２よりリーク率αが１％未満
の場合、集塵用水量が１４０ｔ／ｈであれば炉頂圧力回
収発電設備５の入口側の含塵濃度は５ｍｇ／Ｎｍ3 以下
にすることができる。同様に、リーク率αが１％以上
１．３％未満の場合、集塵用水量を２００ｔ／ｈにして
おけば、炉頂圧力回収発電設備５の入口側の含塵濃度を
５ｍｇ／Ｎｍ3 以下にすることができる。また、リーク
率αが１．３％以上以上２．６％未満の場合には集塵用
水量を３００ｔ／ｈに、リーク率αが２．６％以上以上
４．６％未満の場合には集塵用水量を４００ｔ／ｈにて
おけば、炉頂圧力回収発電設備５の入口側の含塵濃度を
５ｍｇ／Ｎｍ3 以下にすることができる。That is, as shown in FIG. 2, when the leak rate α is less than 1% and the amount of water for dust collection is 140 t / h, the dust concentration at the inlet side of the furnace top pressure recovery power generation facility 5 is 5 mg / Nm 3 or less. can do. Similarly, when the leak rate α is 1% or more and less than 1.3%, if the amount of water for dust collection is set to 200 t / h, the dust concentration on the inlet side of the furnace top pressure recovery power generation facility 5 is 5 mg / Nm 3 It can be: When the leak rate α is 1.3% or more and less than 2.6%, the amount of water for dust collection is 300 t / h, and when the leak rate α is 2.6% or more and less than 4.6%. If the amount of water for dust collection is set to 400 t / h, the dust concentration at the inlet side of the furnace top pressure recovery power generation facility 5 can be 5 mg / Nm 3 or less.
【００２０】[0020]
【発明の効果】本発明により、高炉ガスが炉頂圧力回収
発電設備を損傷することなく、湿式集塵装置への給水量
を大幅に削減することができ、省コスト、省エネルギー
等の多大な効果を享受するものである。EFFECTS OF THE INVENTION According to the present invention, the amount of water supplied to the wet dust collector can be greatly reduced without damaging the furnace top pressure recovery power generation facility by the blast furnace gas, and great effects such as cost saving and energy saving can be achieved. To enjoy.
【図１】本発明に実施例を示す高炉ガス清浄装置の概略
図。FIG. 1 is a schematic view of a blast furnace gas cleaning apparatus showing an embodiment of the present invention.
【図２】切替弁のリーク率αと炉頂圧力回収発電設備入
側含塵濃度の関係を示図。FIG. 2 is a diagram showing the relationship between the leak rate α of the switching valve and the dust concentration on the inlet side of the furnace pressure recovery power generation facility.
１ 高炉 １ａ 上昇管 １ｂ 下降管 ２ ダストキャッチャー ３、４、１８ 分岐ガス配管 ３ａ バグフィルター ４ａ、４ｂ ベンチュリスクラバー ５ 炉頂圧力回収発電設備 ６ 貯留タンク ７ 給水ポンプ ８ 給水弁 ９ａ 入口弁 ９ｂ 出口弁 １０ 切替弁 １１ 循環系統 １２ａ、１２ｂ、１２ｃ ガス温度計 １３ 制御演算装置 １３ａ リーク率演算部 １３ｂ 湿式集塵機給水量制御部 １３ｃ 設定器 １４、１５、１６ 開閉弁 １７ 集合ガス配管 １９ 炉頂圧力回収発電設備バイパス管 Ａ 集合点 1 Blast furnace 1a Rise pipe 1b Downcomer pipe 2 Dust catcher 3, 4, 18 Branch gas pipe 3a Bag filter 4a, 4b Venturi scrubber 5 Top pressure recovery power generation equipment 6 Storage tank 7 Water supply pump 8 Water supply valve 9a Inlet valve 9b Outlet valve 10 Switching valve 11 Circulation system 12a, 12b, 12c Gas thermometer 13 Control calculation device 13a Leak rate calculation unit 13b Wet dust collector water supply amount control unit 13c Setting device 14, 15, 16 Open / close valve 17 Collecting gas piping 19 Top pressure recovery power generation facility Bypass pipe A meeting point
───────────────────────────────────────────────────── フロントページの続き (72)発明者 仲家 清 山口県光市大字島田3434番地 新日本製鐵 株式会社光製鐵所内 (72)発明者 馬場 秀之 山口県光市大字島田3434番地 新日本製鐵 株式会社光製鐵所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nakaya 3434 Shimada, Hitsu-shi, Yamaguchi Prefecture Shinoda Nippon Steel Co., Ltd., Hikari Works, Ltd. Hikari Steel Works, Ltd.
Claims (1)
置の間のガス配管を２系統に分岐した後、再び１つのガ
ス配管に集合し、前記２系統に分岐した分岐ガス配管の
一方に湿式集塵装置を設けると共に他方の分岐ガス配管
に二次乾式集塵装置を設け、前記一次乾式集塵装置で高
炉ガスを一次集塵処理し、更に、前記湿式集塵装置又は
二次乾式集塵装置のいずれかで二次集塵処理した後、前
記炉頂圧力回収発電装置で高炉ガスの有するエネルギ−
を回収する高炉ガスの処理方法において、前記湿式集塵
装置側系統を仕切り、前記二次乾式集塵装置で高炉ガス
を二次集塵処理している際に、該二次乾式集塵装置の出
側分岐ガス配管及び湿式集塵装置の出側分岐ガス配管内
の高炉ガス温度Ｔａ、Ｔｃを各々測定すると共に前記分
岐ガス配管の集合点から前記炉頂圧力回収発電装置間の
ガス配管内の高炉ガス温度Ｔｂを測定し、この各測定高
炉ガス温度を基に下記（１）式により前記湿式集塵装置
から前記炉頂圧力回収発電装置に漏洩する高炉ガスの漏
洩率αを求め、該漏洩率αにより前記湿式集塵装置へ供
給する集塵用給水量を調整して該炉頂圧力回収発電装置
に流入する高炉ガス中のダスト濃度を所定値以下に維持
することを特徴とする高炉ガスの処理方法。 【数１】 ただし、Ｃｐ：高炉ガス比熱 γ：ミストの蒸発潜熱 η：ミストの蒸発率 Ｗ：湿式集の出側における高炉ガス中のミスト含有量。1. A gas pipe between a primary dry dust collector and a furnace top pressure recovery power generator is branched into two systems, and then collected again into one gas pipe, and one of the branched gas pipes branched into the two systems. A wet dust collector and a secondary dry dust collector on the other branch gas pipe, the primary dry dust collector performs primary dust collection on the blast furnace gas, and the wet dust collector or the secondary dry dust collector is used. After secondary dust collection by any of the dust collectors, the energy contained in the blast furnace gas at the furnace top pressure recovery power generator
In the method for treating blast furnace gas for recovering, the wet dust collector side system is partitioned, and when the blast furnace gas is subjected to the secondary dust collector by the secondary dry dust collector, the secondary dry dust collector The blast furnace gas temperatures Ta and Tc in the outlet side branch gas pipe and the outlet side branch gas pipe of the wet dust collector are respectively measured, and the gas pipes between the furnace top pressure recovery power generator from the gathering point of the branch gas pipes are measured. The blast furnace gas temperature Tb is measured, and the leak rate α of the blast furnace gas leaking from the wet dust collector to the furnace top pressure recovery power generator is obtained by the following equation (1) based on each measured blast furnace gas temperature, and the leak is obtained. A blast furnace gas characterized in that the dust concentration in the blast furnace gas flowing into the furnace top pressure recovery power generator is maintained below a predetermined value by adjusting the amount of water for dust collection supplied to the wet dust collector by the rate α. Processing method. [Equation 1] However, Cp: specific heat of blast furnace gas γ: latent heat of vaporization of mist η: evaporation rate of mist W: content of mist in the blast furnace gas at the exit side of the wet collector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12881595A JP3776947B2 (en) | 1995-05-01 | 1995-05-01 | Blast furnace gas treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12881595A JP3776947B2 (en) | 1995-05-01 | 1995-05-01 | Blast furnace gas treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08302409A true JPH08302409A (en) | 1996-11-19 |
| JP3776947B2 JP3776947B2 (en) | 2006-05-24 |
Family
ID=14994107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12881595A Expired - Fee Related JP3776947B2 (en) | 1995-05-01 | 1995-05-01 | Blast furnace gas treatment method |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101988135A (en) * | 2010-11-24 | 2011-03-23 | 武汉钢铁(集团)公司 | Control process of blast-furnace gas dedusting system |
-
1995
- 1995-05-01 JP JP12881595A patent/JP3776947B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101988135A (en) * | 2010-11-24 | 2011-03-23 | 武汉钢铁(集团)公司 | Control process of blast-furnace gas dedusting system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3776947B2 (en) | 2006-05-24 |
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