JPH0691968B2 - Operating method of flue gas treatment equipment - Google Patents
Operating method of flue gas treatment equipmentInfo
- Publication number
- JPH0691968B2 JPH0691968B2 JP4236186A JP4236186A JPH0691968B2 JP H0691968 B2 JPH0691968 B2 JP H0691968B2 JP 4236186 A JP4236186 A JP 4236186A JP 4236186 A JP4236186 A JP 4236186A JP H0691968 B2 JPH0691968 B2 JP H0691968B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- electrostatic precipitator
- dust
- exhaust 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.)
- Expired - Fee Related
Links
Landscapes
- Treating Waste Gases (AREA)
- Electrostatic Separation (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、例えば石炭焚ボイラの排ガス処理システムに
使用される排煙処理装置の運転方法に関する。Description: FIELD OF THE INVENTION The present invention relates to a method for operating a flue gas treatment device used in, for example, an exhaust gas treatment system for a coal-fired boiler.
従来の技術 第４図は一般的な排煙処理装置の系統図を示したもの
で、１は乾式電気集じん器、２はガスガスヒータの熱回
収部、３は湿式脱硫装置、４は湿式電気集じん器、５は
前記ガスガスヒータの再加熱部、６は煙突、７は排出ダ
スト濃度監視用のダスト濃度計、８はガスガスヒータの
スートブロー装置、９は湿式電気集じん器のための直流
高圧電源（以下パワーパックと称する）である。なお、
ガスガスヒータはダストリークのないノンリーク形が使
われており、ダスト濃度計７は低濃度の測定に適した光
透過式又は光散乱式の高感度式のものが使用されてい
る。2. Description of the Related Art FIG. 4 shows a system diagram of a general flue gas treatment device. 1 is a dry electric dust collector, 2 is a heat recovery part of a gas gas heater, 3 is a wet desulfurization device, and 4 is wet electric Dust collector, 5 is a reheating part of the gas gas heater, 6 is a chimney, 7 is a dust densitometer for monitoring exhaust dust concentration, 8 is a soot blow device of the gas gas heater, and 9 is DC high voltage for wet electric dust collector. A power source (hereinafter referred to as a power pack). In addition,
The gas heater is a non-leak type without a dust leak, and the dust densitometer 7 is a light transmission type or a light scattering type high sensitivity type suitable for low concentration measurement.
図示しないボイラからの排ガスは、乾式電気集じん器１
で先ずダストが除去され、ガスガスヒータの熱回収部２
に送られて温度が下げられる。次に、湿式脱硫装置３で
排ガス中のSOxが除去され、それから湿式電気集じん器
４でSOxの除去された排ガス中のダスト分を除去する。
その後、排ガスは、ガスガスヒータの再加熱部５で温度
が上げられ、煙突６を通して大気へ放出される。Exhaust gas from a boiler (not shown) is a dry type electrostatic precipitator 1.
First, the dust is removed and the heat recovery section 2 of the gas heater is used.
Sent to and the temperature is lowered. Next, the wet desulfurization device 3 removes SOx from the exhaust gas, and then the wet electrostatic precipitator 4 removes dust from the exhaust gas from which SOx has been removed.
After that, the temperature of the exhaust gas is raised in the reheating unit 5 of the gas gas heater, and the exhaust gas is discharged to the atmosphere through the chimney 6.
このような排煙処理装置において、ガスガスヒータの熱
回収側２に付着したダストを除去するために、スートブ
ロー装置８を運転してスートブローを行うので、このス
ートブロー時には、多量のダストが一時的に飛散する。
この時のダストは、脱硫装置３や湿式電気集じん器４に
よつて捕集される。In such a flue gas treatment device, the soot blow device 8 is operated to perform soot blow in order to remove dust adhering to the heat recovery side 2 of the gas gas heater, so a large amount of dust is temporarily scattered during this soot blow. To do.
The dust at this time is collected by the desulfurization device 3 and the wet electrostatic precipitator 4.
発明が解決しようとする問題点 上記のような排煙処理装置を従来の方法で運転すると、
第５図に示すように、ダスト濃度計７の指示を見ると、
スートブローを行わない通常運転の場合には、排出ダス
ト濃度は低くほぼ一定であるが、スートブロー装置８に
よってガスガスヒータの熱回収部２側のスートブローを
行うと、排出ダスト濃度に大きなピークが繰返し現れる
ことになる。このピーク値は、スートブローをしない通
常時の２〜３倍にも達することがわかつた。Problems to be Solved by the Invention When the flue gas treatment device as described above is operated by the conventional method,
As shown in FIG. 5, looking at the instructions of the dust densitometer 7,
In the normal operation without soot blowing, the exhaust dust concentration is low and almost constant. However, when the soot blowing device 8 soot blows on the heat recovery section 2 side of the gas gas heater, a large peak appears repeatedly in the exhaust dust concentration. become. It has been found that this peak value reaches as much as 2 to 3 times that in the normal state without soot blowing.
このような排出ダスト濃度の突変現象は、一日の平均排
出ダスト濃度の規定値を満足してはいても、ピーク濃度
の規定値をオーバしたり、煙色の変動（例えば通常時に
煙が見えなくてもスートブロー時には見えるようにな
る）として現われるという問題があつた。又、ピーク値
が規定値以下であつても排出ダスト濃度の突変現象その
ものが問題視されることもある。Such a sudden change in the concentration of discharged dust may exceed the specified value of the peak concentration or change the smoke color (for example, when smoke is normally generated, even though the specified value of the average discharged dust concentration of one day is satisfied. Even if you can't see it, you will be able to see it at the sootblow). In addition, even when the peak value is less than or equal to the specified value, the phenomenon of sudden change in the exhaust dust concentration itself may be regarded as a problem.
なお、上述の排出ダスト濃度の突変は、スートブローを
連続的に実施すれば防ぐことができるものであるが、ス
ートブローを連続的に実施すると、そのための蒸気や圧
縮空気が多量に必要になるという問題があつた。The sudden change in the exhaust dust concentration described above can be prevented by continuously performing soot blowing, but if soot blowing is continuously performed, a large amount of steam and compressed air for that is required. There was a problem.
問題点を解決するための手段 このような問題点を解決するために、本発明では、排ガ
スを熱回収側に送り温度を下げるガスガスヒータと、こ
のガスガスヒータで温度の下げられた排ガス中のSOxを
除去する湿式脱硫装置と、この湿式脱硫装置でSOxの除
去された排ガス中のダスト分を除去する湿式電気集じん
器と、この湿式電気集じん器でダスト分の除去された排
ガスが前記ガスガスヒータの再加熱部で温度が上げられ
た後その排ガスを大気に放出する煙突とからなる排煙処
理装置を運転する方法において、前記ガスガスヒータの
熱回収側のスートブロー時には、前記湿式電気集じん器
を100％電流又は最大荷電率で運転し，通常運転時には
スートブロー時の電流又は荷電率より低い値で運転する
ことを特徴とする排煙処理装置の運転方法を提供してい
る。Means for Solving Problems In order to solve such problems, in the present invention, a gas gas heater that lowers the temperature of the exhaust gas sent to the heat recovery side, and SOx in the exhaust gas whose temperature is lowered by this gas gas heater A wet desulfurization device for removing the exhaust gas, a wet electrostatic precipitator for removing dust in the exhaust gas from which SOx has been removed by the wet desulfurization device, and an exhaust gas for which dust has been removed by the wet electrostatic precipitator In a method of operating a flue gas treatment device comprising a chimney that emits the exhaust gas to the atmosphere after the temperature is raised in the reheating part of the gas heater, the wet electrostatic precipitator is used at the time of soot blowing on the heat recovery side of the gas gas heater. Is operated at 100% current or maximum charge rate, and is operated at a value lower than the current or charge rate during soot blow during normal operation. ing.
作用 湿式電気集じん器は荷電電流を最大（100％）にした時
に、最高性能を発揮するので、上述の手段のようにすれ
ば、スートブロー時に湿式電気集じん器を最大能力で運
転し、通常運転時にはそれよりも低い能力例えば排出ダ
スト濃度がスートブロー時のピーク値に相当する能力で
運転するようにしたので、排出ダスト濃度が均等化され
る。Action The wet electrostatic precipitator exhibits its best performance when the charging current is maximized (100%), so if the above-mentioned means is adopted, the wet electrostatic precipitator will operate at the maximum capacity during soot blowing. At the time of operation, the capacity is lower than that, for example, the capacity of the exhaust dust concentration corresponds to the peak value at the soot blow, so that the exhaust dust concentration is equalized.
実施例 以下本発明の実施例を第１図ないし第３図を参照して詳
細に説明する。なお、第１図において、第４図と同一部
分には同一符号を付してあるのでその部分の説明は省略
する。Embodiments Embodiments of the present invention will be described in detail below with reference to FIGS. 1 to 3. In FIG. 1, the same parts as those in FIG. 4 are designated by the same reference numerals, and the description thereof will be omitted.
第１図は本発明の運転方法を説明するために示した排煙
処理装置の一実施例の系統図であり、制御装置10が追加
されている他は第４図のものと同様である。この制御装
置10は、スートブロー装置８からスートブロー動作信号
を受けるとともに、ダスト濃度計７から検出信号を受け
て、パワーパック９の電流値を制御するものである。FIG. 1 is a system diagram of an embodiment of a flue gas treatment apparatus shown for explaining the operating method of the present invention, and is the same as that of FIG. 4 except that a control device 10 is added. The control device 10 receives the soot blow operation signal from the soot blow device 8 and the detection signal from the dust densitometer 7 to control the current value of the power pack 9.
湿式電気集じん器４の荷電電流値とその出口でのダスト
濃度との関係は、第２図にスートブローしない時の特性
カーブを示してあるように、電流も最大（100％）にし
たときに電気集じん器４は最高性能を発揮するので、そ
のときのダスト濃度は最低となり、電流が少なくなるに
従いダスト濃度は高くなる。従つて、湿式電気集じん器
４の性能をガスガスヒータの熱回収部２側のスートブロ
ー時のダスト濃度のピーク値が規定値以下に収まるよう
に予め設計しておき、スートブロー時には最大性能で運
転するようにし、カートブロー時以外は荷電量を下げて
運転するようにする。すなわち、制御装置10はスートブ
ロー装置８からのスートブロー動作信号を受けて、スー
トブロー中はパワーパツク９の荷電を100％になるよう
に指令し、スートブロー休止中はパワーパック９の電流
値を図中に符号Ａで示すように、ダスト濃度計７のスー
トブロー時のピーク値と同等の濃度になるように制御す
るものである。The relationship between the charging current value of the wet electrostatic precipitator 4 and the dust concentration at the outlet is as shown in the characteristic curve of when the soot-blowing is not performed in FIG. 2 when the current is set to the maximum (100%). Since the electrostatic precipitator 4 exhibits the highest performance, the dust concentration at that time becomes the minimum, and the dust concentration increases as the current decreases. Therefore, the performance of the wet electrostatic precipitator 4 is designed in advance so that the peak value of the dust concentration at the time of soot blowing on the side of the heat recovery part 2 of the gas gas heater falls within the specified value, and it is operated at maximum performance during soot blowing. In this case, the charge amount is reduced except when the cart is blown. That is, the control device 10 receives a soot blow operation signal from the soot blow device 8 and instructs the charging of the power pack 9 to be 100% during the soot blow, and the current value of the power pack 9 is coded in the figure during the soot blow suspension. As indicated by A, the dust concentration meter 7 is controlled so as to have a concentration equivalent to the peak value during soot blowing.
次に、第３図は間欠荷電方式を採用している湿式電気集
じん器の場合の荷電率とダスト濃度との関係を示した特
性図である。この場合も、第２図と同様に、荷電率１で
電気集じん器４は最大能力も発揮し、それ以下では能力
が低下する。従つて、この場合も、スートブロー中はパ
ワーパック９を荷電率１になるように制御し、スートブ
ロー休止中は図中に符号Ｂで示すようにスートブロー時
のピーク値と同当の濃度になるように荷電率を制御す
る。Next, FIG. 3 is a characteristic diagram showing the relationship between the charge rate and the dust concentration in the case of a wet electrostatic precipitator adopting the intermittent charging method. Also in this case, as in FIG. 2, the electrostatic precipitator 4 exerts the maximum capacity at the charge rate of 1, and the capacity is reduced below the maximum capacity. Therefore, also in this case, the power pack 9 is controlled so as to have the charging rate of 1 during soot blowing, and during the soot blowing pause, the concentration is equivalent to the peak value during soot blowing, as indicated by symbol B in the figure. Control the charge rate.
発明の効果 以上詳述したように、本発明によれば、排出ダスト濃度
が平滑化されガスガスヒータの熱回収部側のスートブロ
ー時のダスト濃度の突変が防止できる。このような運転
方法は、湿式電気集じん器をスートブロー時のピーク値
ベースで設計するため、その容量は大形化してイニシヤ
ルコストは高くなる。しかし、湿式電気集じん器のスー
トブローは間欠的に行えるので、蒸気又は圧縮空気の使
用量が大幅に低下し、スートブロー休止中の湿式電気集
じん器の消費電力も大幅に低下するため、ライニングコ
ストが軽減されて総合的には経済的となる。EFFECTS OF THE INVENTION As described above in detail, according to the present invention, the exhaust dust concentration is smoothed, and it is possible to prevent the dust concentration from suddenly changing during soot blowing on the heat recovery portion side of the gas gas heater. In such an operating method, the wet electrostatic precipitator is designed on the basis of the peak value at the soot blow, so that the capacity becomes large and the initial cost becomes high. However, since the soot blow of the wet electrostatic precipitator can be performed intermittently, the amount of steam or compressed air used is greatly reduced, and the power consumption of the wet electrostatic precipitator during the soot blow suspension is also significantly reduced. Is reduced and becomes economical overall.
第１図は本発明に使用される排煙処理装置の一例を示す
系統図、第２図及び第３図は本発明の運転方法を説明す
るために示した湿式電気集じん器の特性図、第４図は従
来の排煙処理装置の系統図、第５図はスートブロー中に
生ずるダスト濃度の突変現象を説明するために示した特
性図である。 １…乾式電気集じん器、２…ガスガスヒータの熱回収
部、３…湿式脱硫装置、４…湿式電気集じん器、５…ガ
スガスヒータの再加熱部、６…煙突、７…ダスト濃度
計、８…スートブロー装置、９…直流高圧電源（パワー
パック）、10…制御装置。FIG. 1 is a system diagram showing an example of a flue gas treatment apparatus used in the present invention, and FIGS. 2 and 3 are characteristic diagrams of a wet electrostatic precipitator shown for explaining an operating method of the present invention. FIG. 4 is a system diagram of a conventional flue gas treatment device, and FIG. 5 is a characteristic diagram shown for explaining a sudden change in dust concentration that occurs during soot blowing. DESCRIPTION OF SYMBOLS 1 ... Dry electric dust collector, 2 ... Heat recovery part of gas gas heater, 3 ... Wet desulfurization device, 4 ... Wet electric dust collector, 5 ... Reheating part of gas gas heater, 6 ... Chimney, 7 ... Dust concentration meter, 8 ... Soot blow device, 9 ... DC high voltage power supply (power pack), 10 ... Control device.
Claims (1)
ガスヒータと、このガスガスヒータで温度の下げられた
排ガス中のSOxを除去する湿式脱硫装置と、この湿式脱
硫装置でSOxの除去された排ガス中のダスト分を除去す
る湿式電気集じん器と、この湿式電気集じん器でダスト
分の除去された排ガスが前記ガスガスヒータの再加熱部
で温度が上げられた後その排ガスを大気に放出する煙突
とからなる排煙処理装置を運転する方法において、前記
ガスガスヒータの熱回収側のスートブロー時には、前記
湿式電気集じん器を100％電流又は最大荷電率で運転
し、通常運転時にはスートブロー時の電流又は荷電率よ
り低い値で運転することを特徴とする排煙処理装置の運
転方法。1. A gas gas heater for sending exhaust gas to a heat recovery side to lower the temperature, a wet desulfurization device for removing SOx in exhaust gas whose temperature has been lowered by the gas gas heater, and SOx removed by this wet desulfurization device. A wet electrostatic precipitator that removes dust in the exhaust gas, and the exhaust gas from which dust has been removed by the wet electrostatic precipitator is heated to the reheating part of the gas gas heater, and then the exhaust gas is released to the atmosphere. In the method of operating the smoke exhaust treatment device consisting of a chimney, when the soot blow on the heat recovery side of the gas gas heater, the wet electrostatic precipitator is operated at 100% current or the maximum charge rate, during normal operation at the time of soot blow A method for operating a flue gas treatment device, comprising operating at a value lower than an electric current or a charge rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4236186A JPH0691968B2 (en) | 1986-02-27 | 1986-02-27 | Operating method of flue gas treatment equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4236186A JPH0691968B2 (en) | 1986-02-27 | 1986-02-27 | Operating method of flue gas treatment equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62201660A JPS62201660A (en) | 1987-09-05 |
| JPH0691968B2 true JPH0691968B2 (en) | 1994-11-16 |
Family
ID=12633897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4236186A Expired - Fee Related JPH0691968B2 (en) | 1986-02-27 | 1986-02-27 | Operating method of flue gas treatment equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0691968B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK2087938T3 (en) | 2008-02-08 | 2020-08-24 | General Electric Technology Gmbh | METHOD AND DEVICE FOR MANAGING THE DEBATE OF AN ESP |
| JP4853737B2 (en) * | 2008-02-22 | 2012-01-11 | 株式会社日立プラントテクノロジー | Exhaust gas treatment method and apparatus |
| JP5859244B2 (en) * | 2011-08-10 | 2016-02-10 | 三菱日立パワーシステムズ株式会社 | Smoke exhaust treatment equipment and smoke exhaust treatment method |
| CN102397818B (en) * | 2011-10-19 | 2013-12-18 | 李程昊 | Rapping soot blowing device for high-voltage electrostatic dust collector and rapping method thereof |
| EP2873464A1 (en) * | 2013-11-13 | 2015-05-20 | Siemens VAI Metals Technologies GmbH | Filtration of an exhaust gas containing solid particles from a metallurgical plant |
| CN103697487B (en) * | 2013-12-30 | 2016-05-11 | 上海克莱德贝尔格曼机械有限公司 | A kind of flue gas processing device |
-
1986
- 1986-02-27 JP JP4236186A patent/JPH0691968B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62201660A (en) | 1987-09-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |