JPH0424109B2 - - Google Patents
Info
- Publication number
- JPH0424109B2 JPH0424109B2 JP12736483A JP12736483A JPH0424109B2 JP H0424109 B2 JPH0424109 B2 JP H0424109B2 JP 12736483 A JP12736483 A JP 12736483A JP 12736483 A JP12736483 A JP 12736483A JP H0424109 B2 JPH0424109 B2 JP H0424109B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- water
- exhaust gas
- heat exchanger
- temperature
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 239000012717 electrostatic precipitator Substances 0.000 claims description 18
- 239000000428 dust Substances 0.000 description 23
- 238000006477 desulfuration reaction Methods 0.000 description 9
- 230000023556 desulfurization Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 239000010881 fly ash Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000007600 charging Methods 0.000 description 2
- 239000012716 precipitator Substances 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000003657 drainage water Substances 0.000 description 1
- 239000012718 dry electrostatic precipitator Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010278 pulse charging Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
- Electrostatic Separation (AREA)
Description
【発明の詳細な説明】
本発明は、石炭焚ボイラ等の排ガスを処理する
処理装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a treatment device for treating exhaust gas from a coal-fired boiler or the like.
従来のこの種の排ガス処理装置は、排ガス流路
に脱硝装置（図示せず）、空気予熱器（図示せ
ず）、乾式電気集塵機１、再加熱用ガスガスヒー
タ２の高温ガス側熱交換器２ａ、湿式脱硫装置
３、上記ガスガスヒータ２の低温ガス側熱交換器
２ｂ及び煙突４を順に配設している。ここで水管
式ガスガスヒータ２は、上記高温ガス側熱交換器
２ａと低温ガス側熱交換器２ｂとを冷温水循環ラ
イン５で接続して水を媒体としてポンプ（図示せ
ず）により排ガスと熱交換を行なうものである。 A conventional exhaust gas treatment device of this type includes a denitrification device (not shown), an air preheater (not shown), a dry electrostatic precipitator 1, and a high-temperature gas side heat exchanger 2a of a gas gas heater 2 for reheating in the exhaust gas flow path. , a wet desulfurization device 3, a low temperature gas side heat exchanger 2b of the gas gas heater 2, and a chimney 4 are arranged in this order. Here, the water tube type gas heater 2 connects the high temperature gas side heat exchanger 2a and the low temperature gas side heat exchanger 2b with a cold/hot water circulation line 5, and exchanges heat with exhaust gas using water as a medium by a pump (not shown). This is what we do.
この処理装置では、ボイラの排ガスを空気予熱
器に導き燃焼用空気と熱交換して130℃〜160℃程
度まで冷却して電気集塵装置１に導きフライアツ
シユを除去した後ガスガスヒータ２の高温ガス側
交換器２ａに導き、電気集塵装置１の出口におけ
る高温排ガスを水との熱交換により更に低温にし
て湿式脱硫装置３に導く。湿式脱硫装置３では、
排ガス中のSO2をSO2吸収液で吸収除去し、更に
この気液接触過程で、排ガス中の残存フライアツ
シユを除去する。次いでSO2及びフライアツシユ
を除去された排ガスをガスガスヒータ２の低温ガ
ス側熱交換器２ｂに導く。ここでは、湿式脱硫装
置３の処理過程においてSO2吸収液等で降温され
た排ガス温度を水との熱交換により高める。この
ことにより煙突４から大気放出する際、水分凝縮
量を減らし、白煙の発生を抑えるとともに大気中
での温度モーメンタムによる拡散を増やす。 In this treatment device, exhaust gas from the boiler is led to an air preheater, where it exchanges heat with combustion air, cooled to about 130°C to 160°C, and then led to an electrostatic precipitator 1, where fly ash is removed. The high-temperature exhaust gas at the outlet of the electrostatic precipitator 1 is further cooled by heat exchange with water, and is led to the wet desulfurization device 3. In wet desulfurization equipment 3,
SO 2 in the exhaust gas is absorbed and removed by the SO 2 absorbing liquid, and residual fly ash in the exhaust gas is further removed during this gas-liquid contact process. Next, the exhaust gas from which SO 2 and fly ash have been removed is guided to the low temperature gas side heat exchanger 2b of the gas heater 2. Here, the temperature of the exhaust gas, which has been lowered by an SO 2 absorbing liquid or the like in the treatment process of the wet desulfurization device 3, is increased by heat exchange with water. This reduces the amount of water condensation when released into the atmosphere from the chimney 4, suppresses the generation of white smoke, and increases diffusion due to temperature momentum in the atmosphere.
しかし上記ガスガスヒータ２は、電気集塵装置
１の出口における高温排ガスを湿式脱硫装置３に
低温度として導かなければならないため、熱交換
容量が大型となり、設置スペース、コストなどに
問題がある。 However, in the gas heater 2, the high-temperature exhaust gas at the outlet of the electrostatic precipitator 1 must be guided to the wet desulfurization device 3 at a low temperature, so the heat exchange capacity becomes large and there are problems in installation space, cost, etc.
一方、石炭焚ボイラの排ガスに含まれるダスト
であるが、従来の乾式電気集塵機は、捕集するダ
ストの電気抵抗が1011〜12を越えると逆電離現象
が生じ、集塵極表面積当りの捕集性能が著しく低
下することが知られている。 On the other hand, regarding the dust contained in the exhaust gas of coal-fired boilers, in conventional dry type electrostatic precipitators, if the electrical resistance of the dust to be collected exceeds 10 11 to 12 , a reverse ionization phenomenon occurs, and the amount of dust collected per surface area of the dust collection electrode is reduced. It is known that the collection performance deteriorates significantly.
このため下記(イ)〜(ホ)の対策等が考えられてい
る。 For this reason, the following countermeasures (a) to (e) are being considered.
(イ) 集塵極面積を極端に大きくする。(b) Extremely increase the area of the dust collection electrode.
(ロ) ガス温度を上げ、あるいはガスの調質を行な
つてダストの電気抵抗を下げる。(b) Lower the electrical resistance of the dust by raising the gas temperature or refining the gas.
(ハ) パルス荷電、間欠荷電などの特殊な荷電を行
なう。(c) Perform special charging such as pulse charging and intermittent charging.
(ニ) 移動電極を用いて集塵極表面にダストが堆積
しないよう常に清浄に保ち、集塵極上での逆電
離現象を回避する。(d) Use a moving electrode to keep the dust collecting electrode surface clean at all times to prevent dust from accumulating, and to avoid reverse ionization on the collecting electrode.
(ホ) 集塵電極を水冷化して温度−抵抗率曲線の低
温側領域にダスト温度を下げ、集塵極上での逆
電離現象を回避する。(e) Water-cooling the dust collection electrode to lower the dust temperature to the low temperature region of the temperature-resistivity curve to avoid reverse ionization on the dust collection electrode.
本発明は、(ホ)に記載した集塵電極の冷却方式に
着目してなされたもので、集塵電極を冷却ライン
を水管式のガスガスヒータの熱交換ラインを兼用
することにより高抵抗ダスト電気集塵機の性能改
善とガスガスヒータの小型化を一挙に図ることが
できる排ガスの処理装置を提供することを目的と
する。 The present invention has been made by focusing on the method for cooling the dust collecting electrode described in (E), and the cooling line of the dust collecting electrode is also used as the heat exchange line of the water tube type gas gas heater. It is an object of the present invention to provide an exhaust gas treatment device that can improve the performance of a dust collector and downsize a gas heater at the same time.
すなわち本発明は、排ガス流路に水冷電極を備
えた電気集塵機と、水管式ガスガスヒータとを順
に配設し、かつ電気集塵機の水冷電極とガスガス
ヒータの低温ガス側熱交換器とを冷温水循環ライ
ンで接続したことを特徴とする。 That is, the present invention sequentially arranges an electrostatic precipitator equipped with a water-cooled electrode in the exhaust gas flow path and a water tube type gas gas heater, and connects the water-cooled electrode of the electrostatic precipitator and the low-temperature gas side heat exchanger of the gas gas heater to a cold/hot water circulation line. It is characterized by being connected by.
以下本発明を図面を参照して説明する。 The present invention will be explained below with reference to the drawings.
第２図はボイラ排ガスの処理装置の一例を示す
説明図である。この処理装置は、排ガス流路に脱
硝装置（図示せず）、空気予熱器（図示せず）、集
塵電極水冷型乾式電気集塵器１１、再加熱用の水
管式ガスガスヒータ１２の高温ガス側熱交換器１
２ａ、湿式脱硫装置１３、上記ガスガスヒータ１
２の低温ガス側熱交換器１２ｂ及び煙突１４を順
に配設している。更に上記電気集塵器１１の水冷
集塵電極と高温ガス側熱交換器１２ａと低温ガス
側熱交換器１２ｂとを冷温水循環ライン１５で接
続して排ガスと熱交換を行なうようにしている。 FIG. 2 is an explanatory diagram showing an example of a boiler exhaust gas treatment device. This treatment equipment includes a denitrification device (not shown) in the exhaust gas flow path, an air preheater (not shown), a water-cooled dry type electric precipitator 11 with dust collecting electrodes, and a water tube type gas gas heater 12 for reheating the high-temperature gas. Side heat exchanger 1
2a, wet desulfurization device 13, the above gas gas heater 1
Two low-temperature gas side heat exchangers 12b and a chimney 14 are arranged in this order. Furthermore, the water-cooled dust collecting electrode of the electrostatic precipitator 11, the high temperature gas side heat exchanger 12a, and the low temperature gas side heat exchanger 12b are connected by a cold/hot water circulation line 15 to exchange heat with the exhaust gas.
この排ガス処理装置は、電気集塵機１１でボイ
ラ排ガス中のフライアツシユを除去するとともに
集塵電極部で熱交換して排ガスを冷却する。更に
この排ガスをガスガスヒータ１２の高温ガス側熱
交換器１２ａにて再度熱交換して冷却し、湿式脱
硫装置１３に導く。次いで湿式脱硫装置１３にて
排ガス中のSO2及びフライアツシユを除去した
後、ガスガスヒータ１２の低温ガス側熱交換器１
２ｂに導いて排ガスを加温し、煙突１４から大気
に放出する。 This exhaust gas treatment device uses an electrostatic precipitator 11 to remove fly ash from boiler exhaust gas, and also cools the exhaust gas by exchanging heat with a dust collection electrode. Furthermore, this exhaust gas is cooled by exchanging heat again in the high temperature gas side heat exchanger 12a of the gas gas heater 12, and is led to the wet desulfurization device 13. Next, after SO 2 and fly ash in the exhaust gas are removed in the wet desulfurization device 13, the low temperature gas side heat exchanger 1 of the gas gas heater 12 is removed.
2b, the exhaust gas is heated and discharged into the atmosphere from the chimney 14.
一方温水循環ライン１５中の水は、まず電気集
塵機１１の集塵電極部で排ガスの熱を吸収した
後、ガスガスヒータ１２の高温ガス側熱交換器１
２ａでさらに熱を吸収し、昇温する。昇温した水
は、次にガスガスヒータ１２の低温ガス側熱交換
器１２ｂで低温排ガスに熱を奪われ降温する。こ
の後降温した水は再び電気集塵機１１の集塵電極
部に導かれ、以下循環を繰返す。 On the other hand, the water in the hot water circulation line 15 first absorbs the heat of the exhaust gas at the dust collecting electrode part of the electrostatic precipitator 11, and then passes through the high temperature gas side heat exchanger 1 of the gas gas heater 12.
2a further absorbs heat and raises the temperature. The heated water then loses heat to the low-temperature exhaust gas in the low-temperature gas side heat exchanger 12b of the gas gas heater 12, and its temperature decreases. Thereafter, the water whose temperature has been lowered is again led to the dust collection electrode section of the electrostatic precipitator 11, and the circulation is repeated.
しかしてこの処理装置によれば、電気集塵機１
１を水冷電極化することにより高抵抗ダストによ
る逆電離現象を防止し、電気集塵機の高性能化、
小型化を図ることができる。更に電気集塵機１１
の水冷電極がガスガスヒータの高温ガス側熱交換
器の一部を兼ねるので、高温ガス側熱交換器１２
ａの小型化を図ることができるとともに、水を循
環利用することにより、電気集塵機冷却補給水及
び排水を減少若しくは不要とする。 However, according to this processing device, the electrostatic precipitator 1
By making 1 a water-cooled electrode, we can prevent reverse ionization caused by high-resistance dust, improve the performance of electrostatic precipitators,
Miniaturization can be achieved. Furthermore, electric dust collector 11
Since the water-cooled electrode also serves as a part of the high temperature gas side heat exchanger of the gas gas heater, the high temperature gas side heat exchanger 12
A can be made smaller, and by recycling water, the amount of make-up water for cooling the electrostatic precipitator and drainage water can be reduced or eliminated.
第３図は本発明の他の実施例を示す。この処理
装置は、電気集塵機１１の水冷電極がガスガスヒ
ータの高温ガス側熱交換器を兼ねたもので、この
構造によればガスガスヒータの高温ガス側熱交換
器を別途設ける必要がなくなり処理装置をより簡
素化することができる。 FIG. 3 shows another embodiment of the invention. In this processing device, the water-cooled electrode of the electrostatic precipitator 11 also serves as the high-temperature gas side heat exchanger of the gas-gas heater.With this structure, there is no need to separately provide a high-temperature gas-side heat exchanger of the gas-gas heater. It can be further simplified.
以上説明したように電気集塵機を水冷電極構造
として、これがガスガスヒータの高温ガス側熱交
換器を兼るようにしたので、高抵抗ダスト電気集
塵機の性能改善とガスガスヒータの小型化を図る
ことができるなど顕著な効果を奏する。 As explained above, the electrostatic precipitator has a water-cooled electrode structure, which also serves as a heat exchanger on the high-temperature gas side of the gas-gas heater, making it possible to improve the performance of the high-resistance dust electrostatic precipitator and downsize the gas-gas heater. It has a remarkable effect.
第１図は従来の排ガスの処理装置の説明図、第
２図は本発明の一実施例を示す排ガスの処理装置
の説明図、第３図は本発明の他の実施例を示す排
ガスの処理装置の説明図である。
１１……集塵電極水冷型乾式電気集塵機、１２
……ガスガスヒータ、１２ａ……高温ガス側熱交
換器、１２ｂ……低温ガス側熱交換器、１３……
湿式脱硫装置、１４……煙突、１５……冷温水循
環ライン。
FIG. 1 is an explanatory diagram of a conventional exhaust gas treatment device, FIG. 2 is an explanatory diagram of an exhaust gas treatment device showing one embodiment of the present invention, and FIG. 3 is an explanatory diagram of an exhaust gas treatment device showing another embodiment of the present invention. FIG. 2 is an explanatory diagram of the device. 11... Dust collection electrode water-cooled dry type electric precipitator, 12
...Gas gas heater, 12a...High temperature gas side heat exchanger, 12b...Low temperature gas side heat exchanger, 13...
Wet desulfurization equipment, 14...Chimney, 15...Cold/hot water circulation line.
Claims (1)
と、水管式ガスガスヒータとを順に配設し、かつ
電気集塵機の水冷電極とガスガスヒータの低温ガ
ス側熱交換器とを冷温水循環ラインで接続したこ
とを特徴とする排ガスの処理装置。1. An electrostatic precipitator equipped with a water-cooled electrode in the exhaust gas flow path and a water tube type gas gas heater are installed in sequence, and the water-cooled electrode of the electrostatic precipitator and the low-temperature gas side heat exchanger of the gas gas heater are connected by a cold/hot water circulation line. An exhaust gas treatment device featuring:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58127364A JPS6019057A (en) | 1983-07-13 | 1983-07-13 | Exhaust gas treating apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58127364A JPS6019057A (en) | 1983-07-13 | 1983-07-13 | Exhaust gas treating apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6019057A JPS6019057A (en) | 1985-01-31 |
| JPH0424109B2 true JPH0424109B2 (en) | 1992-04-24 |
Family
ID=14958129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58127364A Granted JPS6019057A (en) | 1983-07-13 | 1983-07-13 | Exhaust gas treating apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6019057A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6775047B2 (en) * | 2019-02-25 | 2020-10-28 | 月島機械株式会社 | White smoke prevention system, incineration equipment and white smoke prevention method |
-
1983
- 1983-07-13 JP JP58127364A patent/JPS6019057A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6019057A (en) | 1985-01-31 |
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