JPH0330763B2 - - Google Patents
Info
- Publication number
- JPH0330763B2 JPH0330763B2 JP56140374A JP14037481A JPH0330763B2 JP H0330763 B2 JPH0330763 B2 JP H0330763B2 JP 56140374 A JP56140374 A JP 56140374A JP 14037481 A JP14037481 A JP 14037481A JP H0330763 B2 JPH0330763 B2 JP H0330763B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- low
- pipe
- drum
- water supply
- 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 66
- 238000011084 recovery Methods 0.000 claims description 12
- 238000010025 steaming Methods 0.000 claims description 12
- 239000002918 waste heat Substances 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 239000008400 supply water Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
Landscapes
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Description
【発明の詳細な説明】
この発明は混圧型廃熱回収ボイラに係り、特に
低圧、高圧の各節炭器のスチーミングが生ぜず、
かつ低圧、高圧の各ボイラドラムの相互干渉も少
ない混圧型廃熱回収ボイラに関する。[Detailed Description of the Invention] The present invention relates to a mixed pressure type waste heat recovery boiler, in particular, in which steaming does not occur in low pressure and high pressure economizers, and
The present invention also relates to a mixed pressure waste heat recovery boiler in which there is little mutual interference between low pressure and high pressure boiler drums.
ガスタービン発電により生じた排ガスを始めと
して各種排ガスの熱を回収する方法として排ガス
流中に廃熱ボイラを配置して熱回収を行なうが、
この場合、熱回収効率を高めるために高圧ボイラ
と低圧ボイラを併設した混圧型ボイラを設置する
ことがある。第１図は従来の混圧ボイラの一例を
示す。図において脱気器１の貯水は低圧給水ポン
プ２により主給水管路１５を経て低圧節炭器３に
おいて昇温した後低圧ドラム４に供給される。 A waste heat boiler is placed in the exhaust gas stream to recover heat from various types of exhaust gas, including exhaust gas generated by gas turbine power generation.
In this case, a mixed-pressure boiler that includes a high-pressure boiler and a low-pressure boiler may be installed to increase heat recovery efficiency. FIG. 1 shows an example of a conventional mixed pressure boiler. In the figure, water stored in a deaerator 1 is heated by a low-pressure water pump 2 through a main water supply pipe 15 in a low-pressure economizer 3, and then supplied to a low-pressure drum 4.
低圧ドラム４内の缶水は降水管５および蒸発器
６を循環し、発生した蒸気はドラム４から低圧蒸
気S1として低圧タービン等所定の機器に送られ
る。一方降水管５を下降した缶水の一部は高圧給
水管路１６、高圧給水ポンプ７、高圧節炭器８を
経て高圧ドラム９に至る。高圧ドラム９内の缶水
も低圧ドラム４内の缶水と同様降水管１０、蒸発
器１１を循環し、発生した蒸気は高圧ドラム９、
過熱器１２を経て高圧蒸気S2として高圧タービン
等の機器に供給される。 The canned water in the low-pressure drum 4 circulates through the downcomer pipe 5 and the evaporator 6, and the generated steam is sent from the drum 4 as low-pressure steam S1 to predetermined equipment such as a low-pressure turbine. On the other hand, a portion of the canned water that has descended through the downcomer pipe 5 reaches the high-pressure drum 9 via the high-pressure water supply pipe 16, the high-pressure water supply pump 7, and the high-pressure economizer 8. The canned water in the high-pressure drum 9 is also circulated through the downcomer pipe 10 and the evaporator 11 in the same way as the canned water in the low-pressure drum 4, and the generated steam is circulated through the high-pressure drum 9,
It passes through the superheater 12 and is supplied to equipment such as a high-pressure turbine as high-pressure steam S2 .
この型式のボイラにおいては、低圧節炭器３お
よび高圧節炭器８に供給する給水の流量は主給水
管路１５を通過する給水量によつて調節されるこ
とになるため、弁１５ａを絞つてボイラ負荷低下
に対応して給水流量を減少させると低圧、高圧の
各節炭器３および８においてスチーミングが生じ
る。つまり各ボイラを通過する加熱媒体たる排ガ
ス量は常時ほぼ一定であるため、給水通過量が減
少すると給水の単位体積当りの吸熱量が増大して
スチーミングが生じる。節炭器内でスチーミング
が生じると気液混合物の通過により伝熱管は激し
い衝撃を受けいわゆるウオータハンマーが生じ、
節炭器が損傷する虞れがある。またボイラドラム
の相互干渉を防止するため、低圧ドラム４をバイ
パスして管路１７を設けることもあるが、この場
合には低圧節炭器内でスチーミングが生じると気
液混合物が高圧給水ポンプ７に直接流入するた
め、同ポンプ７のキヤビテーシヨンという問題も
発生する。 In this type of boiler, the flow rate of the water supplied to the low-pressure economizer 3 and high-pressure economizer 8 is adjusted by the amount of water that passes through the main water supply pipe 15, so the valve 15a is throttled. When the water supply flow rate is reduced in response to the drop in boiler load, steaming occurs in each of the low-pressure and high-pressure economizers 3 and 8. In other words, since the amount of exhaust gas, which is a heating medium, passing through each boiler is always approximately constant, when the amount of feed water passing through decreases, the amount of heat absorbed per unit volume of feed water increases, causing steaming. When steaming occurs in the economizer, the heat transfer tubes are subjected to severe impact due to the passage of the gas-liquid mixture, resulting in so-called water hammer.
There is a risk of damage to the economizer. In addition, in order to prevent mutual interference between the boiler drums, the low pressure drum 4 is sometimes bypassed and the pipe line 17 is provided. Since the pump 7 flows directly into the pump 7, cavitation of the pump 7 also occurs.
また高圧ドラム９と低圧ドラム４は降水管５、
高圧給水管路１６、高圧節炭器１６を介して連通
状態となつているため高圧ドラム９のレベル変動
が生じると低圧ドラム４の缶水取り出し量が変化
し低圧ドラム４のレベル変動となつて現れる。す
なわち両ドラムに相互干渉が発生して両ドラムの
レベルを一定に保持することが非常に困難とな
る。 In addition, the high pressure drum 9 and the low pressure drum 4 are connected to the downcomer pipe 5,
Since the high-pressure water supply pipe 16 and the high-pressure energy saver 16 are connected to each other, when the level of the high-pressure drum 9 fluctuates, the amount of canned water taken out of the low-pressure drum 4 changes, resulting in a level fluctuation of the low-pressure drum 4. appear. In other words, mutual interference occurs between the two drums, making it extremely difficult to maintain the level of both drums at a constant level.
この発明の目的的は上述した問題点を除去し低
圧、高圧の各節炭器のスチーミングが生ぜず、か
つ高圧、低圧の各ドラムの相互干渉も殆んどない
混圧型廃熱回収ボイラを提供することにある。 The purpose of this invention is to eliminate the above-mentioned problems and to provide a mixed pressure waste heat recovery boiler in which steaming does not occur in the low-pressure and high-pressure economizers, and there is almost no mutual interference between the high-pressure and low-pressure drums. It is about providing.
要するにこの発明は、低圧ボイラに接続する低
圧節炭器および高圧ドラムに接続する高圧節炭器
を有する混圧型廃熱回収ボイラにおいて、低圧節
炭器と低圧ドラムとを流量調節弁を有する低圧節
炭器出口管路で接続し、前記流量調節弁の上流側
において前記低圧節炭器出口管路より分岐し高圧
ドラムに給水する高圧給水管路を設け、さらに給
水流量調節弁を有し低圧ドラムに一端を接続し他
端を給水流れ方向につき高圧節炭器出口以降の高
圧ボイラ構成部材の液保有部に接続する高圧給水
逃し管路を設けたことを特徴とする節炭器スチー
ミングを防止する混圧型廃熱回収ボイラである。 In short, the present invention provides a mixed pressure waste heat recovery boiler having a low pressure economizer connected to a low pressure boiler and a high pressure economizer connected to a high pressure drum, in which the low pressure economizer and the low pressure drum are connected to a low pressure economizer having a flow rate control valve. A high-pressure water supply pipe is connected to the coalizer outlet pipe, and is branched from the low-pressure economizer outlet pipe on the upstream side of the flow rate control valve to supply water to the high-pressure drum, and further includes a water supply flow rate control valve. A high-pressure water conserver prevents steaming, characterized in that a high-pressure water supply relief pipe is provided, one end of which is connected to the water supply flow direction, and the other end is connected to a liquid holding part of a high-pressure boiler component after the high-pressure water economizer outlet in the flow direction of the water supply. This is a mixed pressure type waste heat recovery boiler.
以下この発明の実施例を図面により説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第２図において、１８は給水再循環管路であり
低圧節炭器出口管路１９の流量調節弁２０下流側
と脱気器１を接続する。２１は循環量を調節する
流量調整弁であつて、高圧給水管路１６はこの流
量調整弁２１の上流側において給水再循環管路１
８に接続している。次に２２は高圧節炭器出口管
路２３と低圧ドラム４を接続する高圧給水逃し管
路、２４は高圧給水逃し管路２２に、２５は高圧
節炭器出口管路２３に各々設けた流量調整弁であ
る。 In FIG. 2, reference numeral 18 denotes a feed water recirculation line, which connects the deaerator 1 to the downstream side of the flow control valve 20 of the low-pressure economizer outlet line 19. Reference numeral 21 denotes a flow rate regulating valve that adjusts the amount of circulation, and the high-pressure water supply pipe 16 connects to the water supply recirculation pipe 1 on the upstream side of this flow rate regulating valve 21.
It is connected to 8. Next, 22 is a high-pressure water supply relief pipe connecting the high-pressure economizer outlet pipe 23 and the low-pressure drum 4, 24 is a high-pressure water supply release pipe 22, and 25 is a flow rate provided in the high-pressure economizer outlet pipe 23. It is a regulating valve.
以上のボイラにおいて、脱気器１の貯水は低圧
給水ポンプ２、主給水管路１５を経て低圧節炭器
３に流入し、節炭器３を出た給水はボイラ負荷に
対応して弁２０を調節し、所定量がボイラドラム
に供給される。低圧節炭器３を出た残りの給水は
再循環管路１８を経て脱気器１に戻る。一方再循
環管路１８内の給水の一部は高圧給水管１６に流
入し高圧ボイラ側に供給される。つまり低圧節炭
器３に対しては低圧ドラム４に対する給水の外、
高圧圧節炭器８に対する給水も通過するため低圧
節炭器３のスチーミングは生じ難い。しかしボイ
ラ負荷の低下の程度によつてはスチーミングを生
ずる虞れもあるのでこの場合は弁２１の開度を大
とし脱気器１に戻る給水量を増加させ、低圧節炭
器３の給水通過量を一定の値に保持する。 In the boiler described above, the water stored in the deaerator 1 flows into the low-pressure economizer 3 via the low-pressure water supply pump 2 and the main water supply pipe 15. A predetermined amount is supplied to the boiler drum. The remaining feed water leaving the low pressure economizer 3 returns to the deaerator 1 via the recirculation line 18. On the other hand, a part of the feed water in the recirculation pipe 18 flows into the high pressure water supply pipe 16 and is supplied to the high pressure boiler side. In other words, in addition to water supply to the low pressure drum 4, for the low pressure economizer 3,
Since the water supplied to the high-pressure economizer 8 also passes through, steaming of the low-pressure economizer 3 is unlikely to occur. However, depending on the degree of reduction in the boiler load, steaming may occur. Maintain the amount of passage at a constant value.
なお低圧ドラム４内の缶水は降水管５、蒸発器
６を循環し、発生した蒸気は低圧ドラム４を経て
低圧蒸気S1として低圧タービンに供給される。 The canned water in the low-pressure drum 4 circulates through the downcomer pipe 5 and the evaporator 6, and the generated steam passes through the low-pressure drum 4 and is supplied to the low-pressure turbine as low-pressure steam S1 .
一方高圧給水管路１６に流入した給水は高圧給
水ポンプ７を経て高圧節炭器８に至り、高圧ボイ
ラの負荷に対応して開度設定して弁２３を経て高
圧ドラム９に至る。高圧節炭器９においてもスチ
ーミング防止上、給水流量は一定の値に保持する
必要があるが、不要分の給水は給水逃し管路２２
を経て低圧ドラム４に供給する。すなわち前述の
弁２０の開度設定はこの給水逃し量も考慮に入れ
て行なう。 On the other hand, the water that has flowed into the high-pressure water supply pipe 16 passes through the high-pressure water supply pump 7, reaches the high-pressure economizer 8, and reaches the high-pressure drum 9 through the valve 23, with the opening degree set in accordance with the load of the high-pressure boiler. In the high-pressure energy saver 9 as well, the water supply flow rate needs to be maintained at a constant value to prevent steaming, but unnecessary water supply is carried out through the water supply release pipe 22.
It is supplied to the low-pressure drum 4 through. In other words, the opening degree of the valve 20 described above is set in consideration of this water supply release amount.
高圧ドラム９内の缶水は降水管１０、蒸発器１
１を循環流動し、発生した蒸気は高圧ドラム９、
過熱器１２を経て高圧蒸気S2として高圧タービン
に供給される。 The canned water in the high-pressure drum 9 is transferred to a downcomer pipe 10 and an evaporator 1
1 is circulated and the generated steam is sent to a high pressure drum 9,
It passes through the superheater 12 and is supplied to the high pressure turbine as high pressure steam S2 .
第３図は別の実施例を示す。この実施例におい
ては高圧節炭器８の入口側と降水管１０とを缶水
循環ポンプ２６を有する缶水循環管路２７で接続
し、高圧ボイラの液保有部としての高圧ドラム９
と低圧ドラム４を給水逃し管路２８で接続する。
これによりボイラ起動時高圧ドラム９のレベルが
急激に上昇しても弁２９を開とすることにより高
圧ドラム９の缶水を低圧ドラム４にブローし、系
外に排出することがないので回収熱量の損失がな
い。ボイラの起動が完了し高圧ドラム９のレベル
も安定したならば弁２９を絞り、高圧節炭器８の
流量調節は弁３０による給水流量と缶水循環管路
２７による缶水循環量を調節することにより行な
う。なおこの場合、高圧ドラム９のレベル制御を
行なうため弁２９の開度を調節する。 FIG. 3 shows another embodiment. In this embodiment, the inlet side of the high-pressure economizer 8 and the downcomer pipe 10 are connected by a can water circulation pipe 27 having a can water circulation pump 26, and a high-pressure drum 9 serves as a liquid storage part of the high-pressure boiler.
and the low-pressure drum 4 are connected by a water supply relief pipe 28.
As a result, even if the level of the high-pressure drum 9 suddenly rises when the boiler is started, the canned water in the high-pressure drum 9 is blown to the low-pressure drum 4 by opening the valve 29, and is not discharged outside the system, so the amount of heat recovered is There is no loss. Once the boiler has started up and the level of the high pressure drum 9 has stabilized, the valve 29 is throttled down, and the flow rate of the high pressure economizer 8 is adjusted by adjusting the water supply flow rate through the valve 30 and the can water circulation amount through the can water circulation pipe 27. Let's do it. In this case, the opening degree of the valve 29 is adjusted in order to control the level of the high-pressure drum 9.
この発明を実施することにより高圧節炭器、低
圧節炭器共にボイラ負荷に係りなく常時所定量も
しくはそれ以上の給水が通過するためスチーミン
グの虞れはない。 By implementing this invention, a predetermined amount of water or more is always passed through both the high-pressure economizer and the low-pressure economizer regardless of the boiler load, so there is no risk of steaming.
また高圧ドラムに対する給水の供給は低圧ドラ
ムを経由しないで行なわれるので両ドラムの相互
干渉も殆んど生じない。 Further, since water is supplied to the high pressure drum without passing through the low pressure drum, there is almost no mutual interference between the two drums.
第１図は従来の混圧型廃熱回収ボイラの系統
図、第２図はこの発明に係る混圧型廃熱回収ボイ
ラの系統図、第３図は別の実施例を示す混圧型廃
熱回収ボイラの系統図である。
３……低圧節炭器、４……低圧ドラム、８……
高圧節炭器、９……高圧ドラム、１８……給水再
循環管路、１９……低圧節炭器出口管路、２０，
２１，２４，２５，２９……流量調節弁、２２，
２８……給水逃し管路、２３……高圧節炭器出口
管路、２７……缶水循環管路。
Fig. 1 is a system diagram of a conventional mixed pressure type waste heat recovery boiler, Fig. 2 is a system diagram of a mixed pressure type waste heat recovery boiler according to the present invention, and Fig. 3 is a system diagram of a mixed pressure type waste heat recovery boiler showing another embodiment. This is a system diagram of 3...Low pressure economizer, 4...Low pressure drum, 8...
High-pressure economizer, 9... High-pressure drum, 18... Feed water recirculation line, 19... Low-pressure economizer outlet line, 20,
21, 24, 25, 29...flow control valve, 22,
28... Water supply relief pipe, 23... High pressure economizer outlet pipe, 27... Canned water circulation pipe.
Claims (1)
ドラムに接続する高圧節炭器を有する混圧型廃熱
回収ボイラにおいて、低圧節炭器と低圧ドラムと
を流量調節弁を有する低圧節炭器出口管路で接続
し、前記流量調節弁の上流側において前記低圧節
炭器出口管路より分岐し高圧ドラムに給水する高
圧給水管路を設け、さらに給水流量調節弁を有し
低圧ドラムに一端を接続し他端を給水流れ方向に
つき高圧節炭器出口以降の高圧ボイラ構成部材の
液保有部に接続する高圧給水逃し管路を設けたこ
とを特徴とする節炭器スチーミングを防止する混
圧型廃熱回収ボイラ。 ２ 前記高圧給水逃し管路を高圧ドラムに接続
し、かつ高圧ボイラの降水管下端と高圧節炭器の
入り口とを缶水循環ポンプを有する缶水循環管路
で接続したことを特徴とする特許請求の範囲第１
項記載の節炭器スチーミングを防止する混圧型廃
熱回収ボイラ。[Claims] 1. A mixed-pressure waste heat recovery boiler having a low-pressure economizer connected to a low-pressure drum and a high-pressure economizer connected to a high-pressure drum, in which the low-pressure economizer and the low-pressure drum have a flow rate regulating valve. A high-pressure water supply pipe connected to the low-pressure economizer outlet pipe and branched from the low-pressure economizer outlet pipe on the upstream side of the flow rate control valve to supply water to the high-pressure drum is provided, further comprising a water supply flow rate control valve. A steaming energy saver characterized in that a high pressure water supply relief pipe is provided, one end of which is connected to the low pressure drum, and the other end is connected in the flow direction of the water supply to a liquid holding part of a high pressure boiler component after the outlet of the high pressure energy savings device. A mixed pressure type waste heat recovery boiler that prevents 2. The high-pressure water supply relief pipe is connected to the high-pressure drum, and the lower end of the downcomer pipe of the high-pressure boiler and the inlet of the high-pressure economizer are connected by a can water circulation pipe having a can water circulation pump. Range 1
A mixed pressure type waste heat recovery boiler that prevents steaming from the energy saver described in Section 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56140374A JPS5843304A (en) | 1981-09-08 | 1981-09-08 | Mixed pressure type waste heat recovery boiler preventing economizer steaming |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56140374A JPS5843304A (en) | 1981-09-08 | 1981-09-08 | Mixed pressure type waste heat recovery boiler preventing economizer steaming |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5843304A JPS5843304A (en) | 1983-03-14 |
| JPH0330763B2 true JPH0330763B2 (en) | 1991-05-01 |
Family
ID=15267332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56140374A Granted JPS5843304A (en) | 1981-09-08 | 1981-09-08 | Mixed pressure type waste heat recovery boiler preventing economizer steaming |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5843304A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0722563Y2 (en) * | 1985-06-18 | 1995-05-24 | バブコツク日立株式会社 | Boiler equipment |
| JPH0772601B2 (en) * | 1987-11-12 | 1995-08-02 | 株式会社日立製作所 | Exhaust heat recovery boiler control method and apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4827101A (en) * | 1971-08-12 | 1973-04-10 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55122001U (en) * | 1979-02-22 | 1980-08-29 |
-
1981
- 1981-09-08 JP JP56140374A patent/JPS5843304A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4827101A (en) * | 1971-08-12 | 1973-04-10 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5843304A (en) | 1983-03-14 |
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