KR100726073B1 - Freshwater apparatus of seawater using waste heat - Google Patents

Freshwater apparatus of seawater using waste heat Download PDF

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KR100726073B1
KR100726073B1 KR1020060084052A KR20060084052A KR100726073B1 KR 100726073 B1 KR100726073 B1 KR 100726073B1 KR 1020060084052 A KR1020060084052 A KR 1020060084052A KR 20060084052 A KR20060084052 A KR 20060084052A KR 100726073 B1 KR100726073 B1 KR 100726073B1
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South Korea
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freshwater
stage
heat
brine
seawater
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KR1020060084052A
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Korean (ko)
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박금서
김점석
구본근
남형식
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두산중공업 주식회사
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/26—Treatment of water, waste water, or sewage by extraction
    • C02F1/265—Desalination
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/08—Seawater, e.g. for desalination
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus

Abstract

A freshwater apparatus of seawater using waste heat is provided to reduce the total freshwater production cost through the reduction of the steam amount by heating a portion of brine using waste heat recovered from an electricity generating system and flowing the heated brine into a brine chamber of a stage part. In a freshwater apparatus of seawater comprising: an evaporator(1) including a stage part(10) divided into a heat recovery area and a heat rejection area and constructed in a multistage; and a brine feeding pump(40) for feeding brine into a seawater feeding pipe(30) which passes through a brine heater(20) via the stage part, and is connected into a first stage(11), the freshwater apparatus further comprises: a freshwater duct(50) crossing from stages of the heat recovery area to stages of the heat rejection area in the stage part; a waste heat recovering steam generator(60) to which freshwater recovered from the freshwater duct is sent such that the freshwater is heat exchanged; a freshwater recovering pipe(70) connected to the waste heat recovering steam generator to send the heat exchanged freshwater to the first stage of the heat recovery area; a freshwater circulating pump(80) installed on a predetermined location of the freshwater recovering pipe; a flow control valve(90) installed in front of the freshwater circulating pump on the freshwater recovering pipe; thermometers(92) installed in front and rear of the waste heat recovering steam generator; and a flow meter(94) installed in rear of the brine feeding pump.

Description

폐열을 이용한 해수담수화장치{Freshwater Apparatus of Seawater using Waste Heat} Freshwater Apparatus of Wastewater using Waste Heat

도 1은 본 발명의 실시예에 따른 해수담수화장치의 일부를 도시한 도면이다.1 is a view showing a part of the seawater desalination apparatus according to an embodiment of the present invention.

* 도면의 주요부분에 대한 부호설명 * * Explanation of Signs of Major Parts of Drawings *

1 : 증발기1: evaporator

10 : 스테이지부10: stage part

20 : 농염수가열기20: concentrated brine heater

21 : 스팀공급관21: steam supply pipe

22 : 응축수회수배관22: condensate recovery pipe

30 : 해수공급배관30: seawater supply piping

40 : 농염수공급펌프40: concentrated brine supply pump

50 : 담수배관50: freshwater pipe

60 : 배열회수증기발생기60: array recovery steam generator

70 : 담수회수배관70: freshwater recovery pipe

80 : 담수순환펌프80: freshwater circulation pump

본 발명은 폐열을 이용한 해수담수화장치에 관한 것으로, 더욱 상세하게는 다단증발방식의 담수화장치에서 담수의 일부를 발전설비의 폐열로 가열하여 증발기의 스테이지안으로 재공급하므로써, 담수생산에 필요한 스팀 소모량을 감소시키고, 열효율을 증대시킬 수 있도록 한 것이다. The present invention relates to a seawater desalination apparatus using waste heat, and more particularly, in a multi-stage evaporation desalination apparatus, a part of fresh water is heated by waste heat of a power plant and resupply into a stage of an evaporator, thereby reducing the steam consumption required for freshwater production. It is to reduce and increase the thermal efficiency.

일반적으로 해수 담수화장치에서 순환농염수(Recycling Brine)는 농염수 순환펌프(Brine Recirculation Pump)에 의하여 각각의 열회복구간(Heat Recovery Section)의 응축기 내부를 흘러 농염수가열기(Brine Heater)에 유입되어 농염수가열기 튜브 바깥쪽으로 흐르는 저압증기(Low Pressure Steam)의 응축열을 이용하여 가열된다. In general, in a seawater desalination system, recycled brine flows into the condenser of each heat recovery section by a brine recirculation pump and flows into the brine heater. It is heated by the heat of condensation of low pressure steam flowing out of the concentrated brine tube.

상기 가열된 순환농염수는 순차적으로 낮은 압력으로 유지되고 있는 스테이지(Stage)의 증발실(Flash Chamber)로 유입된다. 가열된 순환농염수의 유입은 증발실 주변의 낮은 압력으로 인하여 맹렬한 증발(Flashing)이 유도된다. The heated circulating brine is sequentially introduced into a flash chamber of a stage maintained at a low pressure. The inflow of heated circulating brine leads to intense flashing due to the low pressure around the evaporation chamber.

이러한 증발 현상은 유입된 순환농염수가 그 스테이지의 압력에 해당하는 끓는점까지 냉각되는 동안 계속된다. 그리고, 다음 스테이지로 유입되어 이와 같은 과정을 반복하게 되며 점점 농도가 증가하게 된다. This evaporation continues while the incoming circulating brine is cooled to the boiling point corresponding to the pressure of the stage. Then, it enters the next stage and repeats this process, and the concentration gradually increases.

최종 스테이지에 이르러 전체 순환농염수의 농도를 조정하기 위하여 일부는 농염수배출펌프(Brine Blowdown Pump)밖으로 배출된다. 생성된 증기는 기수분리기(Demister)를 지나 포함되어 있을 수 있는 염의 알갱이들을 제거한다. 그리고, 스테이지의 응축기부로 유입되어 튜브 내부를 흐르는 순환농염수에 의하여 담수로 응축된다. 이렇게 각각의 스테이지에서 생성된 담수를 담수펌프(Distillate Pump)를 이용하여 후처리공정으로 이송하게 된다. In order to adjust the concentration of the total circulating brine to reach the final stage, some are discharged out of the brine blowdown pump. The resulting steam removes grains of salt that may be contained past the demister. Then, it is condensed into fresh water by the circulating brine flowing into the condenser part of the stage and flowing inside the tube. The fresh water produced in each stage is transferred to the aftertreatment process using a distillate pump.

여기서, 증발기(Evaporator)는 스팀의 열에너지를 이용하여 가열된 해수로부터 연속적인 증발, 응축의 과정을 통하여 담수를 분리하는 설비이다. 증발기는 여러개(대략 19 ~ 30개)의 스테이지로 구성되며, 각각의 스테이지는 응축기, 기수분리기, 그리고 증발실로 구성되어 있다. Here, the evaporator is a facility for separating fresh water from the seawater heated by using the thermal energy of steam through the process of continuous evaporation, condensation. The evaporator consists of several stages (approximately 19-30), each stage consisting of a condenser, a separator and an evaporation chamber.

이러한 종래의 담수화장치는 발전설비로부터 필요한 열원인 스팀을 공급받도록 되어 있다. 이 스팀은 발전소에서 추가로 전기를 생산할 수 있는 양질로서, 사용량이 많을 수록 운전비용이 상승하는 요인으로 작용한다. 따라서, 종래의 MSF(Multi Stage Flashing)방식의 장치에서, 열효율을 향상시키기 위해서는 증발기내의 전열면적과 스테이지수를 늘려야하기때문에, 설치공간을 많이 차지하게되고, 그에따라 제작비용이 증대되는 문제점이 있었다. The conventional desalination apparatus is to receive steam, which is a necessary heat source, from a power generation facility. This steam is of good quality to generate additional electricity in the power plant, which increases the operating cost with higher usage. Therefore, in the conventional MSF (Multi Stage Flashing) system, the heat transfer area and the number of stages in the evaporator have to be increased in order to improve the thermal efficiency, which takes up a lot of installation space, thereby increasing the manufacturing cost. .

이에 본 발명은 상기와 같은 종래의 제반 문제점을 해결하기 위해 발명된 것으로서, 열회복구간에서 열차단구간의 스테이지로 덕트를 통해 넘어가는 담수의 일부를 회수하여 발전설비로 보내어 가열한 다음, 다시 첫번째 스테이지안으로 유입되도록 하므로써, 스팀양을 절약하여 전체 담수생산비용을 절감시킬 수 있도록 하는 폐열을 이용한 해수담수화장치를 제공함에 그 목적이 있다. Therefore, the present invention was invented to solve the above-mentioned conventional problems, and recovers a part of the fresh water passing through the duct from the heat recovery section to the stage of the heat cut section and sends it to the power generation facility for heating, and then the first The purpose of the present invention is to provide a seawater desalination apparatus using waste heat that can reduce the amount of steam to reduce the total freshwater production cost by allowing the flow into the stage.

상기와 같은 목적을 달성하기 위한 본 발명은 다단으로 이루어지면서 열회복 구간과 열차단구간으로 나뉘는 스테이지부를 포함하는 증발기와, 상기 스테이지부를 통과하여 농염수가열기를 지나서 다시 1번 스테이지안으로 연결되는 해수공급배관안으로 해수를 공급하는 농염수공급펌프와, 상기 농염수가열기안으로 유입되는 스팀이 응축되면서 고온화된 해수공급배관을 통해 다시 스테이지부의 각 스테이지안으로 넘어가면서 증발이 일어나고, 이러한 증발과 함께 해수공급배관의 접촉에 의해 담수를 생성시키는 담수화장치에 있어서, 상기 스테이지부의 열회복구간의 스테이지로부터 열차단구간의 스테이지로 넘어가는 담수덕트로부터 담수를 회수하여 배열회수증기발생기로 보내어서 열교환시킨 다음, 열회복구간의 1번 스테이지로 보내도록 하는 담수회수배관이 연결된 것을 기술적 특징으로 한다. The present invention for achieving the above object is made of a multi-stage evaporator comprising a stage portion divided into a heat recovery section and a heat-transfer section, the seawater supply passing through the stage portion and passing through the brine water heater again into the first stage Condensate water supply pump for supplying seawater into the piping, and the steam flowing into the concentrated salt water heater condenses, and the evaporation takes place again through each step of the stage through the high temperature seawater supply pipe, and evaporation occurs with this evaporation. In the desalination apparatus for generating fresh water by contact, the fresh water is recovered from the fresh water duct passing from the stage of the heat recovery section of the stage portion to the stage of the thermal cutoff section and sent to a heat recovery steam generator for heat exchange, and then the heat recovery section. To stage 1 of It is technically characterized in that a water recovery pipe is connected.

상기 담수회수배관에는 담수의 회수가 원활해지도록 하는 담수순환펌프를 구비한 구조이다. The fresh water recovery pipe is a structure having a fresh water circulation pump to facilitate the recovery of fresh water.

이하, 본 발명의 바람직한 실시예를 첨부된 예시도면에 의거 상세하게 설명한다. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명의 실시예를 나타낸 개략도이다. 도면에 도시된 바와 같이, 본 발명은 다단으로 이루어지면서 열회복구간과 열차단구간으로 나뉘는 스테이지부(10)를 포함하는 증발기(1)와, 상기 스테이지부(10)를 통과하여 농염수가열기(20)를 지나서 다시 1번 스테이지(11)안으로 연결되는 해수공급배관(30)안으로 해수를 공급하는 농염수공급펌프(40)와, 상기 농염수가열기(20)안으로 유입되는 스팀에 의해 응축되면서 고온화된 해수공급배관(30)을 통해 다시 스테이지부(10)의 각 스테이지안으로 넘어가면서 증발이 일어나고, 이러한 증발과 함께 각 스테이지 의 내부를 지나가는 해수공급배관(30)과의 접촉에 의해 담수를 생성시키는 해수담수화장치이다. 1 is a schematic view showing an embodiment of the present invention. As shown in the figure, the present invention is made of a multi-stage evaporator comprising a stage portion 10 divided into a heat recovery section and a heat-transfer section, and the concentrated salt water heater (through the stage unit 10) The condensed water is supplied to the seawater supply pipe 30 through the seawater supply pipe 30 connected to the first stage 11 again after passing through 20), and condensed by steam introduced into the concentrated water heater 20, thereby increasing the temperature. The evaporation occurs while passing back into the respective stages of the stage unit 10 through the provided seawater supply pipe 30, and generating fresh water by contact with the seawater supply pipe 30 passing through the inside of each stage together with the evaporation. It is a seawater desalination device.

여기서, 본 발명은 상기 스테이지부(10)중 열회복구간(Heat Recovery Area)의 스테이지로부터 열차단구간(Heat Rejection Area)의 스테이지로 넘어가는 담수덕트(50)로부터 담수를 회수하여 배열회수증기발생기(60)로 보내어서 열교환시킨 다음, 열회복구간의 1번 스테이지(11)로 보내도록 하는 담수회수배관(70)이 연결된 구조이다.  Here, the present invention recovers fresh water from the fresh water duct 50 from the stage of the heat recovery area (Heat Recovery Area) of the stage unit 10 to the stage of the heat rejection area (Heat Recovery Area) to recover the steam generator After the heat transfer to (60), and then sent to the first stage 11 of the heat recovery section, the fresh water recovery pipe 70 is connected.

상기 스테이지부(10)를 구성하는 열회복구간은 1번 스테이지(11)로부터 16번 스테이지까지이고, 열차단구간은 17번스테이지부터 19번스테이지까지이다. The heat recovery section constituting the stage unit 10 is from stage 1 to stage 16, and the heat shield section is from stage 17 to stage 19.

상기 담수회수배관(70)의 소정위치에는 담수순환펌프(80)를 설치하여 담수가 원활하게 담수회수배관(70)을 통해 회수되어 배열회수증기발생기(60)를 거치도록 한다. The freshwater circulation pump 80 is installed at a predetermined position of the freshwater recovery pipe 70 so that fresh water can be smoothly recovered through the freshwater recovery pipe 70 and passed through the heat recovery steam generator 60.

상기 농염수가열기(20)의 상부에는 저압의 스팀이 공급되도록 하는 스팀공급관(21)이 연결되어 있고, 하부에는 순환되는 농염수가 배관(30)을 통해 농염수가열기(20)의 내부를 거칠때, 유입된 저압의 스팀에 의해 발생하는 응축수를 받아서 회수되도록 하는 응축수회수배관(22)이 설치되어 있다. When the steam supply pipe 21 for supplying low pressure steam is connected to the upper portion of the concentrated salt water heater 20, the concentrated salt water circulated in the lower portion passes through the interior of the concentrated salt water heater 20 through the pipe 30 Condensate recovery pipe 22 is installed to receive and recover the condensate generated by the low pressure steam introduced.

또한, 본 발명은 담수의 제어를 위해 담수회수배관(70)상에, 보다 구체적으로는 담수순환펌프(80)의 전단에 유량제어밸브(90)를 설치하고, 배열회수증기발생기(60)의 전,후단에 각각 온도계(92)를 설치하며, 농염수공급펌프(40)의 후단에 유량계(94)를 설치한다. In addition, the present invention provides a flow control valve 90 on the fresh water recovery pipe 70, more specifically in the front of the fresh water circulation pump (80) for the control of fresh water, the heat recovery steam generator (60) The thermometer 92 is installed at the front and rear ends, respectively, and the flow meter 94 is installed at the rear end of the concentrated salt water supply pump 40.

이와 같이, 본 발명은 증발기를 이루는 다단의 스테이지부중 열회복구간으로부터 열차단구간으로 넘어가는 지점에 설치된 담수덕트에 별도의 담수회수배관을 설치하여 발전설비의 배열회수증기발생기에서 발생하는 배가스의 폐열과 열교환시켜서 열회복구간의 1번 스테이지로 재공급하므로써, 재순환되는 담수가 배열회수증기발생기의 폐열을 공급받아 증발기에 유입되므로, 당초 스팀공급관을 통해 농염수가열기의 내부로 공급되는 스팀의 소모량을 감소시킬 수 있고, 그에따라 발전설비의 보조연료의 사용을 감소시킬 수 있게되어 공해물질 배출량이 감소되는 효과도 있게된다. As described above, the present invention is to install a separate fresh water recovery pipe in the fresh water duct installed at the point passing from the heat recovery section of the multi-stage stage of the evaporator to the train section, waste heat of the exhaust gas generated in the heat recovery steam generator of the power plant By re-supplying heat to the 1st stage of the heat recovery section, the recycled fresh water is supplied to the evaporator by receiving the waste heat of the heat recovery steam generator, and thus the consumption of steam supplied to the inside of the brine water heater through the steam supply pipe is It can also reduce the use of auxiliary fuel in power plants, thereby reducing the emissions of pollutants.

본 발명은 편의상 첨부된 예시도면에 의거 본 발명을 설명하였지만, 이에 국한되지 않고 본 발명의 기술적 사상의 범주내에서 여러가지 변형 및 수정이 가능함은 자명한 사실이다. Although the present invention has been described for convenience of the present invention with reference to the accompanying drawings, it is obvious that various modifications and changes are possible within the scope of the technical idea of the present invention.

Claims (2)

다단으로 이루어지면서 열회복구간과 열차단구간으로 나뉘는 스테이지부를 포함하는 증발기와, 상기 스테이지부를 통과하여 농염수가열기를 지나서 다시 1번 스테이지안으로 연결되는 해수공급배관안으로 해수를 공급하는 농염수공급펌프와, 상기 농염수가열기안으로 유입되는 스팀에 의해 응축되면서 고온화된 해수공급배관을 통해 다시 스테이지부의 각 스테이지안으로 넘어가면서 증발이 일어나고, 이러한 증발과 함께 해수공급배관의 접촉에 의해 담수를 생성시키는 담수화장치에 있어서, An evaporator comprising a stage portion divided into a heat recovery section and a train section, and a concentrated salt supply pump for supplying seawater into the seawater supply pipe connected to the first stage after passing through the concentrated salt water heater through the stage portion; In the desalination apparatus, condensation is caused by the steam introduced into the concentrated salt water heater, the evaporation takes place through the high temperature seawater supply pipe, and the evaporation takes place in each stage of the stage, and the fresh water is generated by contact with the seawater supply pipe. In 상기 스테이지부의 열회복구간의 스테이지로부터 열차단구간의 스테이지로 넘어가는 담수덕트로부터 담수를 회수하여 배열회수증기발생기로 보내어서 열교환시킨 다음, 열회복구간의 1번 스테이지로 보내도록 하는 담수회수배관이 연결된 것을 특징으로 하는 폐열을 이용한 해수담수화장치.The freshwater recovery pipe which recovers fresh water from the freshwater duct from the stage of the heat recovery section of the stage section to the stage of the heat shield section, sends it to the heat recovery steam generator for heat exchange, and then sends it to the first stage of the heat recovery section. Seawater desalination apparatus using waste heat, characterized in that connected. 청구항 1에 있어서, The method according to claim 1, 상기 담수회수배관에는 담수의 회수가 원활해지도록 하는 담수순환펌프를 구비한 것을 특징으로 하는 폐열을 이용한 해수담수화장치. The seawater desalination device using waste heat, characterized in that the fresh water recovery pipe is provided with a fresh water circulation pump to facilitate the recovery of fresh water.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100937450B1 (en) 2007-12-21 2010-01-19 두산중공업 주식회사 A seawater supplying apparatus with cooling tower for a multiple stage flashing facility

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6128490A (en) 1984-07-20 1986-02-08 Toshiba Corp Seawater desalting apparatus for atomic power plant

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6128490A (en) 1984-07-20 1986-02-08 Toshiba Corp Seawater desalting apparatus for atomic power plant

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100937450B1 (en) 2007-12-21 2010-01-19 두산중공업 주식회사 A seawater supplying apparatus with cooling tower for a multiple stage flashing facility

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