JP2012007762A - Drain recovery facility - Google Patents

Drain recovery facility Download PDF

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JP2012007762A
JP2012007762A JP2010141793A JP2010141793A JP2012007762A JP 2012007762 A JP2012007762 A JP 2012007762A JP 2010141793 A JP2010141793 A JP 2010141793A JP 2010141793 A JP2010141793 A JP 2010141793A JP 2012007762 A JP2012007762 A JP 2012007762A
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steam
flash
facility
boiler
drain
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JP5510111B2 (en
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Kazuya Sato
和弥 佐藤
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IHI Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a drain recovery facility capable of achieving recovery and reuse of drain at low cost while saving energy.SOLUTION: The drain recovery facility includes a plurality of flash tanks evaporating again drain recovered from a steam use facility on the upstream side to perform gas-liquid separation into flash steam and hot water and supplying the flash steam to a steam use facility on the downstream side, and the respective flash tanks are interconnected at multiple stages in series via the steam use facilities. Steam is supplied from a boiler to the steam use facility on the upstream side of the flash tank at the first stage, and the flash tank at the final stage supplies the flash steam to a boiler water supply line of the boiler.

Description

本発明は、ドレン回収設備に関する。  The present invention relates to a drain recovery facility.

周知のように、熱媒として利用されて潜熱を失った蒸気の一部は凝縮して高圧高温の復水（ドレン）となるが、このドレンを単に排水するのではエネルギー効率の観点から好ましくない。そこで、近年では、ドレンをフラッシュタンクに回収・導入して再蒸発させてフラッシュ蒸気と温水とに気液分離し、これらフラッシュ蒸気及び温水を熱媒として再利用することが主流となっている。   As is well known, a portion of the steam that has been used as a heat medium and has lost its latent heat condenses into high-pressure and high-temperature condensate (drain), but it is not preferable from the viewpoint of energy efficiency to simply drain this drain. . Therefore, in recent years, it has become the mainstream to collect and introduce drain into a flash tank, re-evaporate it, separate it into flash steam and hot water, and reuse these flash steam and hot water as a heat medium.

例えば、下記特許文献１には、蒸気需要設備から排出されるドレンと蒸気との気液混合流体をフラッシュタンクに導入してフラッシュ蒸気と温水とに気液分離し、このフラッシュタンクから得られるフラッシュ蒸気を圧縮機によって圧縮した後、蒸気需要設備の蒸気供給ラインに還流させる技術が開示されている。   For example, in Patent Document 1 below, a gas-liquid mixed fluid of drain and steam discharged from a steam demand facility is introduced into a flash tank and gas-liquid separated into flash steam and hot water, and the flash obtained from this flash tank A technique is disclosed in which steam is compressed by a compressor and then refluxed to a steam supply line of a steam demand facility.

特開２００８−２５５８８８号公報JP 2008-255888 A

上記特許文献１の技術では、フラッシュタンクから得られるフラッシュ蒸気を蒸気需要設備の蒸気供給ラインに還流させるための圧縮機を設ける必要があるため、設備コストの増大を招くという問題がある。また、圧縮機の回転動力を得るためのエネルギーが別途必要となるため、ドレンの回収及び再利用によるエネルギー効率の改善効果を十分に得ることができない。   In the technique of the above-mentioned patent document 1, since it is necessary to provide a compressor for returning the flash steam obtained from the flash tank to the steam supply line of the steam demand facility, there is a problem that the equipment cost increases. Moreover, since energy for obtaining the rotational power of the compressor is required separately, it is not possible to sufficiently obtain the effect of improving the energy efficiency by collecting and reusing the drain.

本発明は上述した事情に鑑みてなされたものであり、ドレンの回収及び再利用を低コスト且つ省エネルギーで実現可能なドレン回収設備を提供することを目的とする。  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a drain recovery facility that can realize drain recovery and reuse at low cost and energy saving.

上記課題を解決するために、本発明では、ドレン回収設備に係る第１の解決手段として、上流側の蒸気利用設備から回収したドレンを再蒸発させてフラッシュ蒸気と温水とに気液分離すると共に、前記フラッシュ蒸気を下流側の蒸気利用設備に供給するフラッシュタンクを複数具備し、前記フラッシュタンクの各々は前記蒸気利用設備を介して直列に多段接続されており、１段目のフラッシュタンクの上流側の蒸気利用設備はボイラーから蒸気の供給を受け、最終段のフラッシュタンクは前記フラッシュ蒸気を前記ボイラーのボイラー給水ラインに供給する、ことを特徴とする。   In order to solve the above-mentioned problems, in the present invention, as a first solving means related to the drain recovery facility, the drain recovered from the upstream steam utilization facility is re-evaporated and gas-liquid separated into flash steam and hot water. A plurality of flash tanks for supplying the flash steam to the downstream steam utilization facility, and each of the flash tanks is connected in multiple stages in series via the steam utilization facility, upstream of the first-stage flash tank The steam utilization facility on the side is supplied with steam from the boiler, and the flash tank in the final stage supplies the flash steam to the boiler water supply line of the boiler.

また、本発明では、ドレン回収設備に係る第２の解決手段として、上記第１の解決手段において、前記フラッシュタンクの各々は、前記温水を温水利用設備に供給することを特徴とする。
さらに、本発明では、ドレン回収設備に係る第３の解決手段として、上記第２の解決手段において、最終段のフラッシュタンクは、前記温水を前記温水利用設備と前記ボイラー給水ラインとに供給することを特徴とする。 Further, in the present invention, as the second solving means relating to the drain recovery facility, in the first solving means, each of the flash tanks supplies the warm water to the warm water utilization facility.
Furthermore, in the present invention, as the third solution means related to the drain recovery facility, in the second solution means, the last-stage flash tank supplies the warm water to the warm water utilization facility and the boiler water supply line. It is characterized by.

本発明に係るドレン回収設備によれば、ドレンの回収及び再利用に従来技術のような別途エネルギーが必要な圧縮機などを用いる必要がないため、ドレンの回収及び再利用を低コスト且つ省エネルギーで実現することができる。  According to the drain recovery facility according to the present invention, since it is not necessary to use a compressor that requires additional energy as in the prior art for drain recovery and reuse, drain recovery and reuse can be performed at low cost and energy saving. Can be realized.

本実施形態におけるドレン回収設備Ａの構成概略図である。It is a composition schematic diagram of drain recovery equipment A in this embodiment.

以下、図面を参照しながら、本発明の一実施形態について説明する。
図１は、本実施形態におけるドレン回収設備Ａの構成概略図である。この図１に示すように、ドレン回収設備Ａは、給水タンク１、ボイラー２、第１の蒸気利用設備３、第１のフラッシュタンク４、第１の温水バルブ５、第１のレベル計コントローラ６、第２の蒸気利用設備７、第２のフラッシュタンク８、第２の温水バルブ９、及び第２のレベル計コントローラ１０から構成されている。
なお、図１において、実線の矢印は流体（気体及び液体を含む）の流れを示し、破線の矢印は電気信号の流れを示している。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a drain recovery facility A in the present embodiment. As shown in FIG. 1, the drain recovery facility A includes a water supply tank 1, a boiler 2, a first steam utilization facility 3, a first flash tank 4, a first hot water valve 5, and a first level meter controller 6. The second steam utilization facility 7, the second flash tank 8, the second hot water valve 9, and the second level meter controller 10.
In FIG. 1, solid arrows indicate the flow of fluid (including gas and liquid), and broken arrows indicate the flow of electrical signals.

給水タンク１は、ボイラー２に供給すべき蒸気生成用の水を貯留するタンクであり、ボイラー給水ラインＬ１を介してボイラー２と接続されている。この給水タンク１の内部には給水ポンプが設置されており、給水タンク１に貯留された水は給水ポンプによって汲み出されてボイラー給水ラインＬ１を介してボイラー２に供給される。   The water supply tank 1 is a tank for storing water for generating steam to be supplied to the boiler 2, and is connected to the boiler 2 via the boiler water supply line L1. A water supply pump is installed inside the water supply tank 1, and water stored in the water supply tank 1 is pumped out by the water supply pump and supplied to the boiler 2 through the boiler water supply line L1.

ボイラー２は、ボイラー給水ラインＬ１を介して給水タンク１から供給される水を加熱して高圧高温の蒸気を生成するものであり、蒸気供給ラインＬ２を介して第１の蒸気利用設備３と接続されている。ボイラー２で生成された蒸気は、この蒸気供給ラインＬ２を介して第１の蒸気利用設備３に供給される。   The boiler 2 heats the water supplied from the feed water tank 1 through the boiler feed water line L1 to generate high-pressure and high-temperature steam, and is connected to the first steam utilization facility 3 through the steam supply line L2. Has been. The steam generated in the boiler 2 is supplied to the first steam utilization facility 3 through the steam supply line L2.

第１の蒸気利用設備３は、ボイラー２から供給される蒸気を熱媒として利用するものであり、例えば複数の熱交換器３ａから構成されている。各熱交換器３ａにおいて、熱媒として利用されて潜熱を失った蒸気の一部は凝縮してドレンとなって排出される。各熱交換器３ａは第１の回収ラインＬ３を介して第１のフラッシュタンク４と接続されており、各熱交換器３ａから排出されるドレンと蒸気（凝縮しなかった蒸気：温度２７０°Ｃ、圧力６．２ＭＰａＧ程度）との混合流体は第１の回収ラインＬ３を介して第１のフラッシュタンク４に導入される。   The first steam utilization facility 3 uses steam supplied from the boiler 2 as a heat medium, and is composed of, for example, a plurality of heat exchangers 3a. In each heat exchanger 3a, part of the steam that has been used as a heat medium and has lost its latent heat is condensed and discharged as a drain. Each heat exchanger 3a is connected to the first flash tank 4 via a first recovery line L3, and drains and steam discharged from each heat exchanger 3a (steam not condensed: temperature 270 ° C.). The mixed fluid with a pressure of about 6.2 MPaG) is introduced into the first flash tank 4 via the first recovery line L3.

第１のフラッシュタンク４は、第１の蒸気利用設備３（第１のフラッシュタンク４からみて上流側の蒸気利用設備）から導入された（回収した）ドレンと蒸気との混合流体を再蒸発させて中圧中温のフラッシュ蒸気と温水とに気液分離するものであり、第１のフラッシュ蒸気供給ラインＬ４を介して第２の蒸気利用設備７（第１のフラッシュタンク４からみて下流側の蒸気利用設備）と接続されていると共に、第１の温水供給ラインＬ５を介して不図示の温水利用設備と接続されている。なお、この温水利用設備は、プラント内の暖房設備や他の熱交換器など、温水を熱媒として利用できるものであれば何でも良い。   The first flash tank 4 re-evaporates the mixed fluid of drain and steam introduced (collected) from the first steam utilization facility 3 (upstream steam utilization facility as viewed from the first flash tank 4). Gas-liquid separation into medium-pressure and intermediate-temperature flash steam and hot water, and the second steam utilization facility 7 (steam downstream from the first flash tank 4 via the first flash steam supply line L4). And a hot water use facility (not shown) via a first hot water supply line L5. In addition, this warm water utilization equipment may be anything as long as it can use warm water as a heat medium, such as a heating equipment in a plant and other heat exchangers.

第１のフラッシュタンク４内で発生した中圧中温のフラッシュ蒸気（温度２００°Ｃ、圧力１．５ＭＰａＧ程度）は、第１のフラッシュ蒸気供給ラインＬ４を介して第２の蒸気利用設備７に供給される。また、第１のフラッシュタンク４内の下部に溜まった温水は、第１の温水供給ラインＬ５を介して温水利用設備に供給される。   The medium-pressure / medium-temperature flash steam generated in the first flash tank 4 (temperature of 200 ° C., pressure of about 1.5 MPaG) is supplied to the second steam utilization facility 7 via the first flash steam supply line L4. Is done. Further, the hot water accumulated in the lower part of the first flash tank 4 is supplied to the hot water utilization facility via the first hot water supply line L5.

この第１の温水供給ラインＬ５の途中には電磁弁である第１の温水バルブ５が介挿されており、第１のフラッシュタンク４内の温水貯留量が許容値を上回ると、第１のレベル計コントローラ６の制御によって第１の温水バルブ５が開放されて、温水が第１のフラッシュタンク４から第１の温水供給ラインＬ５を介して温水利用設備に供給される。  A first hot water valve 5 that is an electromagnetic valve is inserted in the middle of the first hot water supply line L5. When the amount of hot water stored in the first flash tank 4 exceeds an allowable value, The first hot water valve 5 is opened by the control of the level meter controller 6, and hot water is supplied from the first flash tank 4 to the hot water utilization facility via the first hot water supply line L5.

第２の蒸気利用設備７は、第１のフラッシュタンク４から供給されるフラッシュ蒸気を熱媒として利用するものであり、例えば複数の熱交換器７ａから構成されている。各熱交換器７ａにおいて、熱媒として利用されて潜熱を失ったフラッシュ蒸気の一部は凝縮してドレンとなって排出される。各熱交換器７ａは第２の回収ラインＬ６を介して第２のフラッシュタンク８と接続されており、各熱交換器７ａから排出されるドレンとフラッシュ蒸気（凝縮しなかったフラッシュ蒸気）との混合流体は第２の回収ラインＬ６を介して第２のフラッシュタンク８に導入される。  The second steam utilization facility 7 uses flash steam supplied from the first flash tank 4 as a heat medium, and is composed of, for example, a plurality of heat exchangers 7a. In each heat exchanger 7a, part of the flash steam that has been used as a heat medium and has lost its latent heat is condensed and discharged as a drain. Each heat exchanger 7a is connected to the second flash tank 8 via the second recovery line L6, and the drain and flash steam (flash steam that has not been condensed) discharged from each heat exchanger 7a. The mixed fluid is introduced into the second flash tank 8 through the second recovery line L6.

第２のフラッシュタンク８は、第２の蒸気利用設備７（第２のフラッシュタンク８からみて上流側の蒸気利用設備）から導入された（回収した）ドレンとフラッシュ蒸気との混合流体を再蒸発させて低圧低温のフラッシュ蒸気と温水とに気液分離するものであり、第２のフラッシュ蒸気供給ラインＬ７を介してボイラー給水ラインＬ１と接続されていると共に、第２の温水供給ラインＬ８を介して不図示の温水利用設備及びボイラー給水ラインＬ１と接続されている。   The second flash tank 8 re-evaporates the mixed fluid of the drain and the flash steam introduced (recovered) introduced from the second steam utilization facility 7 (the upstream steam utilization facility as viewed from the second flash tank 8). Gas-liquid separation into low-pressure and low-temperature flash steam and hot water, and is connected to the boiler feed water line L1 via the second flash steam supply line L7 and via the second hot water supply line L8. And a hot water utilization facility (not shown) and a boiler water supply line L1.

第２のフラッシュタンク８内で発生した低圧低温のフラッシュ蒸気（温度１１０°Ｃ、圧力０．０５ＭＰａＧ程度）は、第２のフラッシュ蒸気供給ラインＬ７を介してボイラー給水ラインＬ１に供給される。また、第２のフラッシュタンク８内の下部に溜まった温水は、第２の温水供給ラインＬ８を介して温水利用設備及びボイラー給水ラインＬ１に供給される。   The low-pressure and low-temperature flash steam (temperature 110 ° C., pressure 0.05 MPaG) generated in the second flash tank 8 is supplied to the boiler feed water line L1 through the second flash steam supply line L7. Further, the hot water accumulated in the lower part of the second flash tank 8 is supplied to the hot water utilization facility and the boiler water supply line L1 via the second hot water supply line L8.

この第２の温水供給ラインＬ８の途中には電磁弁である第２の温水バルブ９が介挿されており、第２のフラッシュタンク８内の温水貯留量が許容値を上回ると、第２のレベル計コントローラ１０の制御によって第２の温水バルブ９が開放されて、温水が第２のフラッシュタンク８から第２の温水供給ラインＬ８を介して温水利用設備及びボイラー給水ラインＬ１に供給される。  A second hot water valve 9 that is an electromagnetic valve is inserted in the middle of the second hot water supply line L8, and if the amount of hot water stored in the second flash tank 8 exceeds the allowable value, the second hot water valve 9 is inserted. The second hot water valve 9 is opened under the control of the level meter controller 10, and hot water is supplied from the second flash tank 8 to the hot water use facility and the boiler water supply line L1 via the second hot water supply line L8.

このように、本実施形態におけるドレン回収設備Ａでは、ボイラー２で生成された高圧高温の蒸気を熱媒として第１の蒸気利用設備３で利用した後、ドレン及び未凝縮蒸気の混合流体として第１のフラッッシュタンク４に回収し、中圧中温のフラッシュ蒸気と温水とに気液分離する。そして、第１のフラッシュタンク４からフラッシュ蒸気を第２の蒸気利用設備７に送って熱媒として再利用する一方、温水を温水利用設備に送ってプラント内の暖房等に再利用する。   As described above, in the drain recovery facility A in the present embodiment, the high-pressure and high-temperature steam generated in the boiler 2 is used as the heat medium in the first steam utilization facility 3, and then the first fluid as a mixed fluid of drain and uncondensed steam. 1 is collected in a flash tank 4 and separated into gas-liquid separation into medium-pressure medium-temperature flash steam and hot water. Then, the flash steam is sent from the first flash tank 4 to the second steam utilization facility 7 and reused as a heat medium, while the hot water is sent to the hot water utilization facility and reused for heating in the plant.

さらに、第１のフラッッシュタンク４で生成されたフラッシュ蒸気を熱媒として第２の蒸気利用設備７で再利用した後、ドレン及び未凝縮蒸気の混合流体として第２のフラッシュタンク８に回収し、低圧低温のフラッシュ蒸気と温水とに気液分離する。この最終段の第２のフラッシュタンク８で得られる低圧低温のフラッシュ蒸気は、もはや熱媒としての再利用が困難であるため、第２のフラッシュ蒸気供給ラインＬ７を介してボイラー給水ラインＬ１に送ってボイラー２用の水として再利用する。また、最終段の第２のフラッシュタンク８で得られる温水も温水利用設備だけでなく、ボイラー給水ラインＬ１に送ってボイラー２用の水として再利用する。   Further, after the flash steam generated in the first flash tank 4 is reused in the second steam utilization facility 7 as a heat medium, it is recovered in the second flash tank 8 as a mixed fluid of drain and uncondensed steam. Gas-liquid separation into low-pressure and low-temperature flash steam and hot water. Since the low-pressure and low-temperature flash steam obtained in the second flash tank 8 in the final stage is no longer reusable as a heat medium, it is sent to the boiler feed water line L1 via the second flash steam supply line L7. Recycle as water for boiler 2. Further, the hot water obtained in the second flash tank 8 at the final stage is sent not only to the hot water use facility but also to the boiler water supply line L1 to be reused as water for the boiler 2.

以上のように、本実施形態におけるドレン回収設備Ａによれば、ドレンの回収及び再利用に従来技術のような別途エネルギーが必要な圧縮機などを用いる必要がないため、ドレンの回収及び再利用を低コスト且つ省エネルギーで実現することができる。また、最終段の第２のフラッシュタンク８で得られるフラッシュ蒸気及び温水をボイラー給水ラインＬ１に送ることにより、ボイラー２の給水温度が上昇するため、ボイラー２で使用される燃料を削減できるという効果も得られる。   As described above, according to the drain recovery facility A in the present embodiment, it is not necessary to use a compressor that requires additional energy as in the prior art for drain recovery and reuse. Can be realized at low cost and energy saving. Moreover, since the feed water temperature of the boiler 2 rises by sending the flash steam and hot water obtained in the second flash tank 8 at the final stage to the boiler feed water line L1, the fuel used in the boiler 2 can be reduced. Can also be obtained.

なお、上記実施形態では、２つのフラッシュタンクが蒸気利用設備を介して直列に２段接続されている場合を例示して説明したが、本発明はこれに限定されず、３つ以上のフラッシュタンクが蒸気利用設備を介して直列に多段接続されている構成を採用しても良い。   In the above-described embodiment, the case where two flash tanks are connected in two stages in series via a steam utilization facility has been described as an example. However, the present invention is not limited to this, and three or more flash tanks are used. May be adopted in which multiple stages are connected in series via a steam utilization facility.

Ａ…ドレン回収設備、１…給水タンク、２…ボイラー、３…第１の蒸気利用設備、４…第１のフラッシュタンク、５…第１の温水バルブ、６…第１のレベル計コントローラ、７…第２の蒸気利用設備、８…第２のフラッシュタンク、９…第２の温水バルブ、１０…第２のレベル計コントローラ、Ｌ１…ボイラー給水ライン、Ｌ２…蒸気供給ライン、Ｌ３…第１の回収ライン、Ｌ４…第１のフラッシュ蒸気供給ライン、Ｌ５…第１の温水供給ライン、Ｌ６…第２の回収ライン、Ｌ７…第２のフラッシュ蒸気供給ライン、Ｌ８…第２の温水供給ライン  A ... Drain recovery equipment, 1 ... Water supply tank, 2 ... Boiler, 3 ... First steam utilization equipment, 4 ... First flash tank, 5 ... First hot water valve, 6 ... First level meter controller, 7 DESCRIPTION OF SYMBOLS 2nd steam utilization equipment, 8 ... 2nd flash tank, 9 ... 2nd hot water valve, 10 ... 2nd level meter controller, L1 ... Boiler water supply line, L2 ... Steam supply line, L3 ... 1st Recovery line, L4 ... first flash steam supply line, L5 ... first hot water supply line, L6 ... second recovery line, L7 ... second flash steam supply line, L8 ... second hot water supply line

Claims (3)

上流側の蒸気利用設備から回収したドレンを再蒸発させてフラッシュ蒸気と温水とに気液分離すると共に、前記フラッシュ蒸気を下流側の蒸気利用設備に供給するフラッシュタンクを複数具備し、
前記フラッシュタンクの各々は前記蒸気利用設備を介して直列に多段接続されており、
１段目のフラッシュタンクの上流側の蒸気利用設備はボイラーから蒸気の供給を受け、
最終段のフラッシュタンクは前記フラッシュ蒸気を前記ボイラーのボイラー給水ラインに供給する、
ことを特徴とするドレン回収設備。 Re-evaporating the drain collected from the upstream steam utilization facility to gas-liquid separate into flash steam and hot water, and a plurality of flash tanks for supplying the flash steam to the downstream steam utilization facility,
Each of the flash tanks is connected in multiple stages in series via the steam utilization facility,
The steam utilization equipment on the upstream side of the first stage flash tank is supplied with steam from the boiler,
The last-stage flash tank supplies the flash steam to the boiler water supply line of the boiler,
A drain collection facility characterized by that. 前記フラッシュタンクの各々は、前記温水を温水利用設備に供給することを特徴とする請求項１に記載のドレン回収設備。   The drain recovery facility according to claim 1, wherein each of the flash tanks supplies the warm water to a warm water utilization facility. 最終段のフラッシュタンクは、前記温水を前記温水利用設備と前記ボイラー給水ラインとに供給することを特徴とする請求項２に記載のドレン回収設備。   The drain recovery facility according to claim 2, wherein the last-stage flash tank supplies the warm water to the warm water utilization facility and the boiler feed water line.
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