JP2014006036A - Raw material air cooling method and apparatus of air liquefaction separation facility - Google Patents
Raw material air cooling method and apparatus of air liquefaction separation facility Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
- F25J3/04157—Afterstage cooling and so-called "pre-cooling" of the feed air upstream the air purification unit and main heat exchange line
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04763—Start-up or control of the process; Details of the apparatus used
- F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
- F25J3/04775—Air purification and pre-cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04763—Start-up or control of the process; Details of the apparatus used
- F25J3/04866—Construction and layout of air fractionation equipments, e.g. valves, machines
- F25J3/04951—Arrangements of multiple air fractionation units or multiple equipments fulfilling the same process step, e.g. multiple trains in a network
- F25J3/04957—Arrangements of multiple air fractionation units or multiple equipments fulfilling the same process step, e.g. multiple trains in a network and inter-connecting equipments upstream of the fractionation unit (s), i.e. at the "front-end"
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/24—Processes or apparatus using other separation and/or other processing means using regenerators, cold accumulators or reversible heat exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/30—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes
- F25J2205/32—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes as direct contact cooling tower to produce a cooled gas stream, e.g. direct contact after cooler [DCAC]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/30—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes
- F25J2205/34—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes as evaporative cooling tower to produce chilled water, e.g. evaporative water chiller [EWC]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2270/00—Refrigeration techniques used
- F25J2270/90—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
Description
本発明は、圧縮機で圧縮した原料空気を冷却水で冷却した後、吸着器に導入して精製し、次いで冷却して精留を行い、酸素や窒素等を分離する空気液化分離設備における、原料空気の冷却方法及び装置に関するものである。 In the present invention, in the air liquefaction separation equipment that cools the raw material air compressed by a compressor with cooling water, introduces it into an adsorber and purifies it, then cools and performs rectification to separate oxygen, nitrogen, The present invention relates to a method and apparatus for cooling raw material air.
製鉄所等で使用する酸素、窒素、アルゴンといった空気中の成分ガスの製造技術としては、圧縮機で圧縮した原料空気を冷却水で冷却した後、吸着器に導入して精製し、次いで冷却して液化した後、精留を行い、酸素や窒素等を分離する空気液化分離技術が知られている（例えば、特許文献１、２参照）。 As a technology for producing component gases in the air such as oxygen, nitrogen, and argon used in steelworks, etc., the raw material air compressed by a compressor is cooled with cooling water, then introduced into an adsorber, purified, and then cooled. An air liquefaction separation technique for performing rectification and separating oxygen, nitrogen and the like after liquefaction is known (see, for example, Patent Documents 1 and 2).
図２は、一般的な空気液化分離設備（例えば、１時間当たり２００００〜３００００Ｎｍ３の酸素を製造する空気液化分離設備）の概念図である。空気圧縮機６で圧縮された原料空気は、水冷塔２において、冷却塔５で常温まで冷やされた冷却水により冷却され、更に冷水塔４で冷却された冷水を冷水ポンプ７で送水して冷凍機３により約５℃まで冷却した冷水により約７℃まで冷却された後、吸着器８において水分及び二酸化炭素を吸着除去された後、コールドボックス１２の内部に導入される。コールドボックス１２の内部では、原料空気は蒸留塔１１で分離された液体酸素や液体窒素等と熱交換器１０により熱交換されて一層冷却されると共に、膨張タービン９により液化され、蒸留塔１１において酸素や窒素等に分離される。 FIG. 2 is a conceptual diagram of a general air liquefaction separation facility (for example, an air liquefaction separation facility that produces 20000 to 30000 Nm 3 of oxygen per hour). The raw material air compressed by the air compressor 6 is cooled in the water cooling tower 2 by the cooling water cooled to room temperature in the cooling tower 5, and the cold water cooled in the cold water tower 4 is further fed by the cold water pump 7 to be frozen. After being cooled to about 7 ° C. by cold water cooled to about 5 ° C. by the machine 3, moisture and carbon dioxide are adsorbed and removed by the adsorber 8 and then introduced into the cold box 12. Inside the cold box 12, the raw material air is heat-exchanged with the liquid oxygen or liquid nitrogen separated by the distillation column 11 by the heat exchanger 10 and further cooled, and is liquefied by the expansion turbine 9. Separated into oxygen and nitrogen.
このような空気液化分離設備においては、原料空気を水冷塔２で如何に冷やすかがエネルギー効率（電力効率）に大きく影響することになる。 In such an air liquefaction separation facility, how the raw air is cooled by the water cooling tower 2 greatly affects the energy efficiency (power efficiency).
図３は、図２において原料空気を水冷塔２で冷却する部分をより詳細に示した部分拡大図である。空気圧縮機６で圧縮された原料空気は、断熱圧縮により夏場であれば約７０℃まで上昇する。水冷塔２の内部は２段水冷スプレー２ａ、２ｂが設置されており、原料空気は、先ず１段目の水冷スプレー２ａにより、冷却塔５で２８℃まで冷やされた冷却水を用いて冷却され、更に、２段目の水冷スプレー２ｂにより、冷水塔４では製品にならない約１０℃の粗窒素により１６℃前後まで冷却された冷水を冷水ポンプ７で送水して冷凍機３により約５℃まで冷却した冷水を用いて、約７℃まで冷却される。 FIG. 3 is a partially enlarged view showing in more detail the portion of the raw air cooled in FIG. The raw material air compressed by the air compressor 6 rises to about 70 ° C. in the summer due to adiabatic compression. Two-stage water-cooled sprays 2a and 2b are installed inside the water-cooled tower 2, and the raw material air is first cooled by the first-stage water-cooled spray 2a using the cooling water cooled to 28 ° C. in the cooling tower 5. Furthermore, the cold water cooled to about 16 ° C. by crude nitrogen at about 10 ° C., which is not a product in the cold water tower 4, is supplied by the second stage water-cooled spray 2 b with the chilled water pump 7 to about 5 ° C. by the refrigerator 3. Cooled to about 7 ° C. using chilled cold water.
なお、冷凍機３は、通常、故障等による停止を想定して２台以上設置し、稼働冷凍機と予備冷凍機を設けることが一般的である。図２では、３ａが稼働冷凍機、３ｂが予備冷凍機である。 In general, two or more refrigerators 3 are installed on the assumption of a stop due to a failure or the like, and an operation refrigerator and a spare refrigerator are generally provided. In FIG. 2, 3a is an operation refrigerator, and 3b is a preliminary refrigerator.
しかしながら、上記のような、１時間当たり２００００〜３００００Ｎｍ３の酸素を製造する一般的な空気液化分離設備の場合、１６℃前後まで冷却された原料空気冷却用冷却水を更に約５℃まで冷却するための冷凍機が数百ｋＷの電力を使用していて、空気液化分離設備の製造コストの大きな部分を占めることが問題となっている。しかも、空気液化分離設備は常時稼働しており、夏季昼間などの気温が高く、一般的な電力需要が大きい時間帯に多くの電力を必要とするといった問題がある。 However, in the case of a general air liquefaction separation facility that produces 20000 to 30000 Nm 3 of oxygen per hour as described above, the cooling water for cooling the raw material air that has been cooled to around 16 ° C. is further cooled to about 5 ° C. For this reason, there is a problem that the refrigeration machine uses a power of several hundred kW and occupies a large part of the manufacturing cost of the air liquefaction separation equipment. In addition, the air liquefaction separation facility is always in operation, and there is a problem that a large amount of electric power is required in a time zone where the temperature is high during summer daytime and general electric power demand is large.
本発明は、上記のような事情に鑑みてなされたものであり、空気液化分離設備において、原料空気を冷却する冷却水（原料空気冷却用冷却水）を効率的に冷却して電力使用量を削減することができる空気液化分離設備の原料空気冷却方法及び装置を提供することを目的とするものである。 The present invention has been made in view of the above circumstances, and in an air liquefaction separation facility, cooling water for cooling raw material air (cooling water for raw material air cooling) is efficiently cooled to reduce power consumption. An object of the present invention is to provide a raw material air cooling method and apparatus for air liquefaction separation equipment that can be reduced.
上記課題を解決するために、本発明は以下の特徴を有する。 In order to solve the above problems, the present invention has the following features.
［１］圧縮機で圧縮した原料空気を冷却水で冷却した後、吸着器に導入して精製し、次いで液化して精留を行い、酸素及び窒素等を分離する空気液化分離設備において、
夜間は原料空気を冷却する冷却水を冷凍機で冷却すると共に、その冷熱の一部を蓄熱器に蓄熱し、昼間は原料空気を冷却する冷却水を前記蓄熱器に蓄熱した冷熱で冷却することを特徴とする空気液化分離設備の原料空気冷却方法。
[1] In an air liquefaction separation facility that cools raw material air compressed by a compressor with cooling water, introduces it into an adsorber, purifies it, liquefies it, performs rectification, and separates oxygen, nitrogen, etc.
Cool the cooling water that cools the raw material air with a refrigerator at night, store a part of the cold heat in the regenerator, and cool the cooling water that cools the raw air with the cold heat stored in the regenerator during the day. A raw material air cooling method for an air liquefaction separation facility.
［２］稼動冷凍機と予備冷凍機を備えた既設の空気液化分離設備に前記蓄熱器を設置する場合には、夜間に前記予備冷凍機を用いて前記蓄熱器に冷熱を蓄熱することを特徴とする前記［１］に記載の空気液化分離設備の原料空気冷却方法。 [2] When installing the heat accumulator in an existing air liquefaction separation facility equipped with an operating refrigerator and a preliminary refrigerator, cold energy is stored in the heat accumulator using the preliminary refrigerator at night. The method for cooling the raw material air of the air liquefaction separation facility according to the above [1].
［３］原料空気を圧縮する圧縮機と、該圧縮機で圧縮した原料空気を冷却水で冷却する水冷手段と、該水冷手段で冷却された原料空気を精製する吸着器と、該吸着器で精製された原料空気を液化して精留を行い、酸素及び窒素等を分離する精留手段とを備えた空気液化分離設備において、
原料空気を冷却する冷却水を夜間に冷却する冷凍機と、該冷凍機での冷熱の一部を夜間に蓄熱し、原料空気を冷却する冷却水を前記夜間に蓄熱した冷熱で昼間に冷却する蓄熱器とを備えたことを特徴とする空気液化分離設備の原料空気冷却装置。
[3] A compressor that compresses raw material air, a water cooling means that cools the raw material air compressed by the compressor with cooling water, an adsorber that purifies the raw air cooled by the water cooling means, and the adsorber In an air liquefaction separation facility equipped with rectification means for liquefying purified raw material air to perform rectification and separating oxygen, nitrogen and the like,
A refrigerator that cools the cooling water that cools the raw material air at night, a part of the cold heat in the refrigerator is stored at night, and the cooling water that cools the raw air is cooled in the daytime with the cold heat stored in the night A raw material air cooling device for an air liquefaction separation facility, comprising a heat accumulator.
［４］稼動冷凍機と予備冷凍機を備えた既設の空気液化分離設備に前記蓄熱器を設置する場合には、夜間に前記予備冷凍機を用いて前記蓄熱器に冷熱を蓄熱することを特徴とする前記［３］に記載の空気液化分離設備の原料空気冷却装置。 [4] When installing the heat accumulator in an existing air liquefaction separation facility equipped with an operating refrigerator and a preliminary refrigerator, cold energy is stored in the heat accumulator using the preliminary refrigerator at night. The raw material air cooling apparatus for the air liquefaction separation facility according to [3].
本発明によれば、空気液化分離設備において、夜間は原料空気冷却用冷却水を冷凍機で冷却すると共に、その冷熱の一部を蓄熱器に蓄熱し、昼間は原料空気冷却用冷却水を前記蓄熱器に蓄えた冷熱で冷却するようにしているので、原料空気冷却用冷却水を効率的に冷却することにより、昼間のように気温が高く、一般的に電力需要が大きい時間帯の電力使用量を削減することができる。 According to the present invention, in the air liquefaction separation facility, the cooling water for cooling the raw material air is cooled by the refrigerator at night, and part of the cold heat is stored in the regenerator, and the cooling water for cooling the raw material air is used in the daytime. Cooling with the cold energy stored in the regenerator allows efficient use of the cooling water for cooling the raw material air, so that electricity is used during times when the temperature is high during the daytime and the power demand is generally high. The amount can be reduced.
本発明の一実施形態を図面に基づいて説明する。 An embodiment of the present invention will be described with reference to the drawings.
図１は、本発明の一実施形態における空気液化分離設備の原料空気冷却システムを示す図である。 FIG. 1 is a diagram showing a raw material air cooling system of an air liquefaction separation facility according to an embodiment of the present invention.
図１に示すように、この実施形態においては、夜間に原料空気冷却用冷却水を冷凍機３ａ、３ｂで冷却すると共に、その冷熱の一部を蓄熱槽（蓄熱器）１に蓄熱し、昼間は原料空気冷却用冷却水を蓄熱槽（蓄熱器）１に蓄熱した冷熱にて冷却するようにしている。 As shown in FIG. 1, in this embodiment, the cooling water for cooling the raw material air is cooled by the refrigerators 3a and 3b at night, and part of the cold heat is stored in the heat storage tank (heat accumulator) 1 for daytime. The cooling water for cooling the raw material air is cooled by the cold energy stored in the heat storage tank (heat accumulator) 1.
すなわち、まず、図１（ａ）に示すように、夜間は、空気圧縮機６で圧縮された原料空気は、水冷塔２において、冷却塔５で常温まで冷やされた冷却水により冷却され、更に冷水塔４で冷却された冷水を冷水ポンプ７で送水して稼動冷凍機３ａにより約５℃まで冷却した冷水により約７℃まで冷却される。それと同時に、予備冷凍機３ｂにより冷却された冷水は蓄熱体を内蔵した蓄熱槽１に送られ、その冷熱が蓄熱体に蓄熱される。そして、蓄熱槽１を通過した冷水は、その後、冷却塔５に送られる。 That is, first, as shown in FIG. 1A, at night, the raw material air compressed by the air compressor 6 is cooled in the water-cooled tower 2 by the cooling water cooled to room temperature by the cooling tower 5, The cold water cooled by the cold water tower 4 is fed by the cold water pump 7 and cooled to about 7 ° C. by the cold water cooled to about 5 ° C. by the operating refrigerator 3a. At the same time, the cold water cooled by the preliminary refrigerator 3b is sent to the heat storage tank 1 containing the heat storage body, and the cold heat is stored in the heat storage body. And the cold water which passed the thermal storage tank 1 is sent to the cooling tower 5 after that.
次に、図１（ｂ）に示すように、昼間は、稼動冷凍機３ａと予備冷凍機３ｂのいずれもが停止し、冷水塔４で冷却された冷水は冷水ポンプ７により蓄熱槽１に送水されて、蓄熱槽１に蓄熱された冷熱により約５℃まで冷却された後、水冷塔２へ送られる。 Next, as shown in FIG. 1 (b), both the active refrigerator 3 a and the preliminary refrigerator 3 b are stopped during the day, and the cold water cooled by the cold water tower 4 is sent to the heat storage tank 1 by the cold water pump 7. Then, after being cooled to about 5 ° C. by the cold heat stored in the heat storage tank 1, it is sent to the water cooling tower 2.
なお、図１（ａ）と図１（ｂ）の間の切り替えは、制御装置（図示せず）からの指示に基づいて、開閉弁２１、２２ａ、２２ｂ、２３、２４を開閉することによって行われる。 Note that switching between FIG. 1A and FIG. 1B is performed by opening and closing the on-off valves 21, 22a, 22b, 23, and 24 based on instructions from a control device (not shown). Is called.
これによって、この実施形態では、昼間は、冷凍機３ａ、３ｂがいずれも停止しているため、昼間の冷凍機の電力使用量は０となる。 Accordingly, in this embodiment, since the refrigerators 3a and 3b are both stopped during the daytime, the power consumption of the daytime refrigerator is zero.
なお、図１（ａ）、（ｂ）において、約７℃まで冷却された原料空気は、その後、図２に示したように、吸着器８において水分及び二酸化炭素を吸着除去された後、コールドボックス１２の内部に導入される。コールドボックス１２の内部では、原料空気は蒸留塔１１で分離された液体酸素や液体窒素等と熱交換器１０により熱交換されて一層冷却されると共に、膨張タービン９により液化され、蒸留塔１１において酸素や窒素等に分離される。 In FIGS. 1 (a) and 1 (b), the raw material air cooled to about 7 ° C. is subjected to adsorption and removal of moisture and carbon dioxide in the adsorber 8, as shown in FIG. It is introduced inside the box 12. Inside the cold box 12, the raw material air is heat-exchanged with the liquid oxygen or liquid nitrogen separated by the distillation column 11 by the heat exchanger 10 and further cooled, and is liquefied by the expansion turbine 9. Separated into oxygen and nitrogen.
このようにして、この実施形態においては、夜間は原料空気冷却用冷却水を冷凍機３ａ、３ｂで冷却すると共に、その冷熱の一部を蓄熱槽１に蓄熱し、昼間は原料空気冷却用冷却水を蓄熱槽１に蓄えた冷熱で冷却するようにしているので、昼間の冷凍機の電力使用量を０にして、空気液化分離を行うことが可能である。 Thus, in this embodiment, the cooling water for cooling the raw material air is cooled by the refrigerators 3a and 3b at night, and part of the cold heat is stored in the heat storage tank 1, and the cooling for cooling the raw material air is performed during the day. Since water is cooled by the cold energy stored in the heat storage tank 1, it is possible to perform air liquefaction separation by setting the power consumption of the refrigerator in the daytime to zero.
この場合、例えば、３００００Ｎｍ３／ｈの酸素プラントで、昼間を８：００〜２２：００とし、昼夜の電力単価差５円/ｋＷｈとすると、年間５百万円の電力コスト削減となる。 In this case, for example, in an oxygen plant of 30000 Nm 3 / h, if the daytime is 8:00 to 22:00 and the power unit price difference between day and night is 5 yen / kWh, the power cost is reduced by 5 million yen per year.
なお、蓄熱槽１の蓄熱体としては、約５℃に相変化点を持つ水和物スラリー蓄熱材を使用することにより、蓄熱密度を上げて、蓄熱体の容積を少なくし、建設コストを抑えることができる。 In addition, as a heat storage body of the heat storage tank 1, by using a hydrate slurry heat storage material having a phase change point at about 5 ° C., the heat storage density is increased, the volume of the heat storage body is reduced, and the construction cost is suppressed. be able to.
また、この実施形態においては、稼動冷凍機３ａと予備冷凍機３ｂを備えた既設の空気液化分離設備を念頭において、複数台設置している予備冷凍機３ｂを夜間の冷熱の蓄熱用に利用するようにしているので、実施開始時の設備投資費用の負担も軽減される。 Further, in this embodiment, in consideration of the existing air liquefaction separation equipment provided with the operating refrigerator 3a and the preliminary refrigerator 3b, a plurality of the preliminary refrigerators 3b are used for storing the cold energy at night. As a result, the burden of capital investment costs at the start of implementation is reduced.
もちろん、予備冷凍機を備えていない空気液化分離設備においても、本発明の趣旨に基づいて同様に実施することが可能である。 Of course, it is possible to carry out similarly in an air liquefaction separation facility that does not include a preliminary refrigerator, based on the gist of the present invention.
１ 蓄熱槽（蓄熱器）
２ 水冷塔
２ａ １段目の水冷スプレー
２ｂ ２段目の水冷スプレー
３ 冷凍機
３ａ 稼動冷凍機
３ｂ 予備冷凍機
４ 冷水塔
５ 冷却塔
６ 空気圧縮機
７ 冷水ポンプ
８ 吸着器
９ 膨張タービン
１０ 熱交換器
１１ 蒸留塔
１２ コールドボックス
２１ 開閉弁
２２ａ 開閉弁
２２ｂ 開閉弁
２３ 開閉弁
２４ 開閉弁
1 heat storage tank (heat storage)
2 Water-cooled tower 2a First-stage water-cooled spray 2b Second-stage water-cooled spray 3 Refrigerator 3a Operation refrigeration machine 3b Pre-chiller 4 Chill tower 5 Cooling tower 6 Air compressor 7 Chilled water pump 8 Adsorber 9 Expansion turbine 10 Heat exchange Apparatus 11 Distillation tower 12 Cold box 21 On-off valve 22a On-off valve 22b On-off valve 23 On-off valve 24 On-off valve
Claims (4)
夜間は原料空気を冷却する冷却水を冷凍機で冷却すると共に、その冷熱の一部を蓄熱器に蓄熱し、昼間は原料空気を冷却する冷却水を前記蓄熱器に蓄熱した冷熱で冷却することを特徴とする空気液化分離設備の原料空気冷却方法。 In the air liquefaction separation equipment that cools the raw material air compressed by the compressor with cooling water, introduces it into the adsorber and purifies it, then liquefies it, performs rectification, and separates oxygen, nitrogen, etc.
Cool the cooling water that cools the raw material air with a refrigerator at night, store a part of the cold heat in the regenerator, and cool the cooling water that cools the raw air with the cold heat stored in the regenerator during the day. A raw material air cooling method for an air liquefaction separation facility.
原料空気を冷却する冷却水を夜間に冷却する冷凍機と、該冷凍機での冷熱の一部を夜間に蓄熱し、原料空気を冷却する冷却水を前記夜間に蓄熱した冷熱で昼間に冷却する蓄熱器とを備えたことを特徴とする空気液化分離設備の原料空気冷却装置。 Compressor for compressing raw air, water cooling means for cooling raw air compressed by the compressor with cooling water, an adsorber for purifying raw air cooled by the water cooling means, and purified by the adsorber In the air liquefaction separation equipment equipped with rectification means for liquefying raw material air to perform rectification and separating oxygen, nitrogen, etc.,
A refrigerator that cools the cooling water that cools the raw material air at night, a part of the cold heat in the refrigerator is stored at night, and the cooling water that cools the raw air is cooled in the daytime with the cold heat stored in the night A raw material air cooling device for an air liquefaction separation facility, comprising a heat accumulator.
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| CN105091504A (en) * | 2015-09-11 | 2015-11-25 | 开封黄河空分集团有限公司 | Energy-saving type test run device for water chilling unit |
| EP3974753A3 (en) * | 2020-09-29 | 2022-09-21 | Air Products And Chemicals, Inc. | Chiller, air separation system, and related methods |
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