JPH02633B2 - - Google Patents
Info
- Publication number
- JPH02633B2 JPH02633B2 JP56147506A JP14750681A JPH02633B2 JP H02633 B2 JPH02633 B2 JP H02633B2 JP 56147506 A JP56147506 A JP 56147506A JP 14750681 A JP14750681 A JP 14750681A JP H02633 B2 JPH02633 B2 JP H02633B2
- Authority
- JP
- Japan
- Prior art keywords
- waste heat
- exhaust gas
- gas
- horizontal flow
- heat boiler
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
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
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Description
【発明の詳細な説明】
本発明はセメントキルンの破熱回収方法、特に
セメントキルンのサスペンシヨンプレヒータ排ガ
スが保有する熱を廃熱ボイラによつて回収し有効
利用する場合のセメントキルンの廃熱回収方法に
関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for recovering heat from a cement kiln, particularly a method for recovering waste heat from a cement kiln, in which the heat retained in the suspension preheater exhaust gas of a cement kiln is recovered and effectively utilized by a waste heat boiler. Regarding the method.
最近、省エネに鑑み、セメント焼成工程で発生
する熱を廃熱ボイラで回収することにより蒸気を
発生させ、これを蒸気タービンに導いて発電機を
駆動させ、工場の消費電力の一部を自給するシス
テムが増えている。 Recently, in an effort to save energy, the heat generated in the cement firing process is recovered in a waste heat boiler to generate steam, which is then guided to a steam turbine to drive a generator, thereby providing a portion of the factory's power consumption. systems are increasing.
この場合、廃熱ボイラの設置場所はサスペンシ
ヨンプレヒータ頂部と誘引フアンとの間が誘引フ
アンの消費電力の点から最も有利であることは先
に特願昭56−87087号で提案した通りである。 In this case, the most advantageous location for installing the waste heat boiler is between the top of the suspension preheater and the induction fan in terms of the power consumption of the induction fan, as previously proposed in Japanese Patent Application No. 56-87087. .
これらの廃熱ボイラは既設のセメントキルンに
後から設置されることが殆んどであつて、その構
造上からガス降下流式のものが一般に採用されて
いる。これを第１図々示従来装置によつて説明す
ると、１はサスペンシヨンプレヒータであつて、
これから導出される排ガス導管２―１，２―２が
下向になつていることを利用し、ガス降下流式の
廃熱ボイラ３―１，３―２を取付け、更に排ガス
導管４―１，４―２を介して誘引フアン５―１，
５―２に接続する構成となつている。そして第２
図に示される如く、ガス降下流式の廃熱ボイラ
は、過熱器Ｈ、蒸発器Ｂ、節炭器Ｅを有し、この
内部をチユーブ６が水平状に重畳配置しつつ蛇行
する構成を有している。したがつてサスペンシヨ
ンプレヒータ１からの排ガスは排ガス導管２―１
から図示矢印の方向に廃熱ボイラ３―１に入り、
前記チユーブ群の間を垂直に降下しつつ排ガス導
管４―１から排出される。 Most of these waste heat boilers are installed afterward in an existing cement kiln, and due to their structure, gas downflow type boilers are generally adopted. This will be explained using the conventional device shown in FIG. 1. 1 is a suspension preheater;
Taking advantage of the fact that the exhaust gas conduits 2-1 and 2-2 led out from here are directed downward, gas downward flow type waste heat boilers 3-1 and 3-2 are installed, and then exhaust gas conduits 4-1 and 2-2 are installed. Attracted fan 5-1 through 4-2,
It is configured to be connected to 5-2. and the second
As shown in the figure, the gas downflow type waste heat boiler has a superheater H, an evaporator B, and an economizer E, and has a structure in which tubes 6 meander in a horizontally overlapping arrangement. are doing. Therefore, the exhaust gas from the suspension preheater 1 is transferred to the exhaust gas pipe 2-1.
From there, enter the waste heat boiler 3-1 in the direction of the arrow shown in the figure,
The exhaust gas is discharged from the exhaust gas conduit 4-1 while descending vertically between the tube groups.
一方、サスペンシヨンプレヒータからの排ガス
中には約100ｇ／Ｎm3という多量のダストが含ま
れており、これがチユーブ６に付着堆積して熱貫
流率を低下させるため、スートブロー装置１１に
よつて蒸気又は空気でスートブローすることによ
り、定期的に払い落す必要がある。しかし、この
スートブローによつて払い落されたダストは、全
量がガスと共に廃熱ボイラ３―１から排出される
ために、スートブローを行なう度に誘引フアンを
通過するガス中のダスト濃度が増大することとな
り、いわゆる誘引フアンの脈動現象となつて現わ
れ、前記誘引フアンの安定運転を阻害する（第３
図参照）。 On the other hand, the exhaust gas from the suspension preheater contains a large amount of dust, approximately 100 g/Nm 3 , which accumulates on the tube 6 and reduces the heat transfer coefficient. It must be periodically brushed off by soot blowing with air. However, since all of the dust brushed off by this soot blowing is discharged from the waste heat boiler 3-1 along with the gas, the dust concentration in the gas passing through the induction fan increases each time soot blowing is performed. This occurs as a so-called pulsation phenomenon of the induction fan, which impedes the stable operation of the induction fan (third
(see figure).
この欠点を解消するため、ガス水平流式の廃熱
ボイラを採用すべく考慮がなされている。即ち、
ガス水平流式のボイラは次の点において優れてい
るからである。 In order to overcome this drawback, consideration has been given to adopting a gas horizontal flow type waste heat boiler. That is,
This is because horizontal gas flow type boilers are superior in the following points.
チユーブが垂直配管なので、付着ダストが剥
離し易く、槌打による払い落しが可能となり、
ダスト払い落しに要する電力が発電出力の約
0.5％と少ない。 Since the tube is a vertical pipe, adhering dust can be easily peeled off and can be removed with a hammer.
The power required for dust removal is approximately the power generation output.
It is as low as 0.5%.
槌打時に落下するダストのうち飛散してガス
に同伴するダストの量は僅かで、大部分は底部
のホツパ内にたまる。従つてボイラから出るガ
ス中のダスト濃度の脈動は殆んどない。 Of the dust that falls during hammering, the amount of dust that scatters and accompanies the gas is small, and most of it accumulates in the hopper at the bottom. Therefore, there is almost no pulsation in the dust concentration in the gas coming out of the boiler.
ホツパ内に堆積したダストは誘引フアンを通
すことなく、所望の場所に輸送し処理できる
以上の利点があるにもかかわらず、従来、ガス
水平流式の廃熱ボイラが用いられなかつたのは、
前記の如く、既設のセメントキルンに取付けられ
るのが殆んどであり、サスペンシヨンプレヒータ
からの排ガス導管が垂直に降下して誘引フアンに
接続されており、この排ガス導管の途中にガス水
平流式の廃熱ボイラを設置すると、ボイラ入口及
び出口のガス導管は水平部分が長くなり、ダスト
の堆積により閉塞する恐れがあつたためである。 The dust accumulated in the hopper can be transported to the desired location and treated without passing through an induction fan.Despite these advantages, gas horizontal flow waste heat boilers have not been used in the past due to the following reasons:
As mentioned above, in most cases it is installed in an existing cement kiln, and the exhaust gas pipe from the suspension preheater descends vertically and is connected to the induction fan, and a horizontal gas flow system is installed in the middle of this exhaust gas pipe. This is because if a waste heat boiler was installed, the horizontal portions of the gas pipes at the boiler inlet and outlet would become long, and there was a risk of blockage due to dust accumulation.
本発明は上記問題点を解決することを目的とし
てなされたものであり、サスペンシヨンプレヒー
タからの排ガスをガス水平流式廃熱ボイラによつ
て廃熱回収するに際し、水平部分を省略するセメ
ントキルンの廃熱回収方法を提供することを目的
としている。 The present invention has been made with the aim of solving the above problems, and is a cement kiln in which the horizontal section is omitted when waste heat is recovered from the exhaust gas from the suspension preheater using a gas horizontal flow waste heat boiler. The purpose is to provide a waste heat recovery method.
そして本発明は、日産4000t以上の大型セメン
トキルンでは、サスペンシヨンプレヒータの排ガ
ス導管及び誘引フアンが一般的に２組になつてい
ることに着目し、前記夫々の排ガス経路にガス水
平流式廃熱ボイラをもうけ、前記廃熱ボイラを出
た後のガスを、その同一排ガス経路の後流側に水
平状に戻すことなく、互に他方の排ガス経路の後
流側に戻すことによりガス水平流式廃熱ボイラを
境に排ガス経路を交叉させるようにしようとする
ものである。 The present invention focuses on the fact that in large cement kilns with a daily production capacity of 4,000 tons or more, the suspension preheater's exhaust gas conduit and induction fan are generally arranged in two sets. A gas horizontal flow type is created by providing a boiler and returning the gas after leaving the waste heat boiler to the downstream side of the other exhaust gas path, without returning the gas horizontally to the downstream side of the same exhaust gas path. The idea is to have the exhaust gas paths intersect at the waste heat boiler.
以下図面を参照しつつ実施例を説明する。第４
図は本発明によるセメントキルンの廃熱回収方法
を説明するブロツク構成図、第５図はガス水平流
式廃熱ボイラからのダスト排出を説明する詳細図
である。 Examples will be described below with reference to the drawings. Fourth
FIG. 5 is a block diagram illustrating the waste heat recovery method for a cement kiln according to the present invention, and FIG. 5 is a detailed diagram illustrating dust discharge from the gas horizontal flow type waste heat boiler.
第４図において第１図に対応する符号は第１図
と同一機能を有する。図において３′―１，３′―
２は夫々ガス水平流式廃熱ボイラであつて、サス
ペンシヨンプレヒータ１からの一方の排ガス導管
２―１は、ガス水平流式廃熱ボイラ３′―１の端
部上側面に接続される。また排ガス導管４―２は
同じくガス水平流式廃熱ボイラ３′―１の端部側
面に接続され、他端は誘引フアン５―２に接続さ
れる。並列的にもうけられたガス水平流式廃熱ボ
イラ３′―２には排ガス導管２―２が端部上側面
に接続されると共に、排ガス導管４―１の一方が
端部側面に接続され、他端は誘引フアン５―１に
接続される。 In FIG. 4, the symbols corresponding to those in FIG. 1 have the same functions as in FIG. In the figure, 3'-1,3'-
2 are gas horizontal flow type waste heat boilers, and one exhaust gas conduit 2-1 from the suspension preheater 1 is connected to the upper end surface of the gas horizontal flow type waste heat boiler 3'-1. Further, the exhaust gas conduit 4-2 is similarly connected to the end side surface of the gas horizontal flow type waste heat boiler 3'-1, and the other end is connected to the induction fan 5-2. The exhaust gas conduit 2-2 is connected to the upper side of the end of the parallel gas horizontal flow waste heat boiler 3'-2, and one of the exhaust gas conduits 4-1 is connected to the side of the end. The other end is connected to the attraction fan 5-1.
要するに第４図はＡ，B2系列の各装置が並列
して運転している状態を示し、したがつて３′―
１はＡ系列の、又３′―２はＢ系列の各水平流式
廃熱ボイラである。そして各水平流式廃熱ボイラ
３′―１，３′―２はキルン１２上方に配置され
る。 In short, Fig. 4 shows a state in which each device of the A and B2 series is operating in parallel, and therefore 3'--
1 is an A-series horizontal flow waste heat boiler, and 3'-2 is a B-series horizontal flow waste heat boiler. Each horizontal flow type waste heat boiler 3'-1, 3'-2 is arranged above the kiln 12.
そのため各サスペンシヨンプレヒータ１からの
排ガスは、各排ガス導管２―１，２―２を介して
各系列の水平流式廃熱ボイラ３′―１，３′―２に
入り、矢印方向に流れながら熱交換しつつ温度を
低下させ、排ガス導管４―２，４―１を経ること
により、対向系列の誘引フアン５―２，５―１に
導入される。即ち、ガス水平流式廃熱ボイラ３′
―１，３′―２の前後において２組の排ガス経路
は交叉し、完全に入替わることになる。なお、こ
のように排ガス経路が入替つても、セメントキル
ンの操業上は何ら問題ないことは勿論である。 Therefore, the exhaust gas from each suspension preheater 1 enters the horizontal flow waste heat boiler 3'-1, 3'-2 of each series via each exhaust gas conduit 2-1, 2-2, and flows in the direction of the arrow. The temperature is lowered while exchanging heat, and the exhaust gas is introduced into the induction fans 5-2, 5-1 of the opposing series by passing through the exhaust gas conduits 4-2, 4-1. That is, the gas horizontal flow type waste heat boiler 3'
The two sets of exhaust gas paths intersect before and after -1, 3'-2, and are completely switched. It goes without saying that even if the exhaust gas route is replaced in this way, there is no problem in the operation of the cement kiln.
又、ガス水平流式廃熱ボイラ３′―１，３′―２
に堆積したダストは各排ガス経路中にある誘引フ
アン５―２，５―１の吐出側ガス流中に戻してや
れば輸送設備費が省略できて効率的な操業が可能
となる。 In addition, gas horizontal flow type waste heat boiler 3'-1, 3'-2
If the accumulated dust is returned to the gas flow on the discharge side of the induction fans 5-2, 5-1 in each exhaust gas path, transportation equipment costs can be omitted and efficient operation can be achieved.
第５図によつて本発明方法に使用されるダスト
排出装置を説明する。図はガス水平流式廃熱ボイ
ラ３′―１の機能構成図であつて符号２―１，
３′―１，４―２，５―２は第４図に対応してい
る。６′はチユーブであつて縦に折曲配置されて
いることは当然のことである。７は槌打装置であ
つて各チユーブ間に装着され、予じめ設定された
順序と時間間隔にしたがつて、ダストの落下量が
平均化されるよう自動的に槌打ちが行なわれる。
８はホツパであつてガス水平流式廃熱ボイラ３′
―１の下部にもうけられ、槌打ちによつて払い落
されたダストが堆積するようになつている。９は
定量供給装置であつて前記堆積したダストを定量
毎に切出す。１０はコンベアであつて誘引フアン
５―２の吐出側近傍までもうけられる。 The dust discharge device used in the method of the present invention will be explained with reference to FIG. The figure is a functional configuration diagram of the gas horizontal flow type waste heat boiler 3'-1, with reference numerals 2-1,
3'-1, 4-2, and 5-2 correspond to FIG. It is a matter of course that 6' is a tube and is bent vertically. Reference numeral 7 denotes a hammering device which is installed between each tube, and hammers are automatically performed according to a preset order and time interval so that the amount of dust falling is averaged.
8 is a hopper, which is a gas horizontal flow waste heat boiler 3'
-1, where the dust that is removed by hammering is deposited. Reference numeral 9 denotes a metering supply device which cuts out the accumulated dust in fixed amounts. Reference numeral 10 is a conveyor, which is provided near the discharge side of the induction fan 5-2.
したがつて払い落されたダストは、一旦ホツパ
７内に堆積され、順次、定量供給装置９とコンベ
ア１０とによつて誘引フアン５―２の吐出側に輸
送される。 Therefore, the dust that has been brushed off is once deposited in the hopper 7, and is sequentially transported to the discharge side of the induction fan 5-2 by the quantitative supply device 9 and the conveyor 10.
以上説明した如く、本発明によればサスペンシ
ヨンプレヒータからの排ガスをガス水平流式廃熱
ボイラに夫々導入し、前記廃熱ボイラから排出さ
れたガスを同一排ガス経路の後流側に戻すことな
く、互に他方排ガス経路の後流側に排出してガス
経路を交叉させるようにすると共に、払い落され
たダストを誘引フアンの吐出側に輸送するよう構
成したので、効率的な廃熱回収ができることは勿
論のこと、誘引フアンを通過する排ガス中のダス
ト濃度を減少させ、誘引フアンの消費電力を減少
させることが可能である。 As explained above, according to the present invention, the exhaust gas from the suspension preheater is introduced into each of the gas horizontal flow type waste heat boilers, without returning the gas discharged from the waste heat boilers to the downstream side of the same exhaust gas path. The exhaust gas paths are mutually discharged to the downstream side of the other exhaust gas path so that the gas paths intersect, and the dust that is brushed off is transported to the discharge side of the induction fan, so efficient waste heat recovery is achieved. Of course, it is possible to reduce the dust concentration in the exhaust gas passing through the induction fan and reduce the power consumption of the induction fan.
第１図はガス降下流式廃熱ボイラを用いた従来
の廃熱回収方法を示す図、第２図はガス降下流式
廃熱ボイラの詳細図、第３図はスートブローによ
るボイラ出口ガス濃度の脈動を示す図、第４図は
本発明による廃熱回収方法を示す図、第５図はダ
スト排出装置の説明図である。
１…サスペンシヨンプレヒータ、２―１，２―
２…廃ガス導管、３―１，３―２…ガス降下流式
廃熱ボイラ、３′―１，３′―２…ガス水平流式廃
熱ボイラ、４―１，４―２…排ガス導管、５―
１，５―２…誘引フアン、６…チユーブ、７…槌
打装置、８…ホツパ、９…定量供給装置、１０…
コンベア、１１…スートブロー装置、Ｈ…過熱
器、Ｂ…蒸発器、Ｅ…節炭器、Ｄ…気水ドラム。
Figure 1 shows the conventional waste heat recovery method using a gas downflow waste heat boiler, Figure 2 is a detailed diagram of the gas downflow waste heat boiler, and Figure 3 shows how the boiler outlet gas concentration is determined by soot blowing. FIG. 4 is a diagram showing the waste heat recovery method according to the present invention, and FIG. 5 is an explanatory diagram of the dust discharge device. 1...Suspension preheater, 2-1,2-
2... Waste gas conduit, 3-1, 3-2... Gas downflow type waste heat boiler, 3'-1, 3'-2... Gas horizontal flow type waste heat boiler, 4-1, 4-2... Exhaust gas conduit , 5-
1,5-2... Attraction fan, 6... Tube, 7... Hammering device, 8... Hopper, 9... Constant supply device, 10...
Conveyor, 11... Soot blow device, H... Superheater, B... Evaporator, E... Energy saver, D... Air/water drum.
Claims (1)
２系列からなる排ガス導管の各対応系列内にある
廃熱ボイラに導入し、各系列毎に廃熱を回収した
後誘引フアンに接続する構成を有するセメントキ
ルンの廃熱回収方法において、上記廃熱ボイラは
ガス水平流式廃熱ボイラとしてセメントキルン上
で交叉して配置し、各対応系列から導入された排
ガスは前記各系列に属する水平流式廃熱ボイラを
経由させるとともにセメントキルン上で交叉して
異系列側のフアンに接続し、かつ前記各水平流式
廃熱ボイラから排出されたダストは前記異系列側
の誘引フアンの吐出側に輸送することを特徴とす
るセメントキルンの廃熱回収方法。1 Exhaust gas from the suspension preheater,
In a method for recovering waste heat from a cement kiln, the waste heat is introduced into a waste heat boiler in each corresponding series of exhaust gas pipes consisting of two series, and the waste heat is recovered in each series and then connected to an induction fan. The boilers are arranged as gas horizontal flow waste heat boilers, crossing each other on the cement kiln, and the exhaust gas introduced from each corresponding series is passed through the horizontal flow waste heat boiler belonging to each of the above series, and is crossed on the cement kiln. A method for recovering waste heat in a cement kiln, characterized in that the horizontal flow waste heat boiler is connected to a fan on a different series side, and the dust discharged from each of the horizontal flow waste heat boilers is transported to the discharge side of the induction fan on the different series side. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56147506A JPS5849892A (en) | 1981-09-18 | 1981-09-18 | Method of recovering waste heat of cement kiln and dust discharger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56147506A JPS5849892A (en) | 1981-09-18 | 1981-09-18 | Method of recovering waste heat of cement kiln and dust discharger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5849892A JPS5849892A (en) | 1983-03-24 |
| JPH02633B2 true JPH02633B2 (en) | 1990-01-08 |
Family
ID=15431900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56147506A Granted JPS5849892A (en) | 1981-09-18 | 1981-09-18 | Method of recovering waste heat of cement kiln and dust discharger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5849892A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH056333U (en) * | 1991-07-09 | 1993-01-29 | 徳山曹達株式会社 | Liquid level indicator |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2295925A1 (en) * | 1974-12-27 | 1976-07-23 | Fives Cail Babcock | IMPROVEMENTS TO THE FACILITIES FOR THE MANUFACTURING OF CEMENT BY THE DRY METHOD WITH A VIEW TO RECOVERING THE ENERGY LOST BY FUMES |
| JPS5931919B2 (en) * | 1976-07-20 | 1984-08-04 | ソニー株式会社 | color imaging device |
-
1981
- 1981-09-18 JP JP56147506A patent/JPS5849892A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH056333U (en) * | 1991-07-09 | 1993-01-29 | 徳山曹達株式会社 | Liquid level indicator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5849892A (en) | 1983-03-24 |
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