KR100428379B1 - Concentrating apparatus and method - Google Patents
Concentrating apparatus and method Download PDFInfo
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- KR100428379B1 KR100428379B1 KR10-2001-0020107A KR20010020107A KR100428379B1 KR 100428379 B1 KR100428379 B1 KR 100428379B1 KR 20010020107 A KR20010020107 A KR 20010020107A KR 100428379 B1 KR100428379 B1 KR 100428379B1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/26—Multiple-effect evaporating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/0064—Feeding of liquid into an evaporator
- B01D1/007—Feeding of liquid into an evaporator the liquid feed being split up in at least two streams before entering the evaporator
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Abstract
본 발명은 농축장치 및 농축방법에 관한 것으로, 제1 및 제2 액유입부, 제1 및 제2 농축튜브, 제1 및 제2 액유출부, 증기공급라인 및 응축수배출라인, 제1 및 제2 폐증기배출라인, 제1 및 제2 액순환라인, 제1 및 제2 농축액배출라인, 및 제1 및 제2 액공급라인을 포함하는 농축장치에 의해 제1 및 제2 액공급라인 중 하나의 액공급라인의 차단밸브를 개방하여 용액을 연속적으로 공급하고, 제1 및 제2 액공급라인 중 다른 하나의 액공급라인에 연결되는 농축액배출라인의 차단밸브를 소정시간마다 소정시간동안 개방하여 농축액을 배출하며, 상기 용액이 공급되는 액공급라인과 농축액이 배출되는 농축액배출라인을 소정시간 간격마다 다른 액공급라인 및 농축액배출라인과 교번적으로 전환시킨다. 이러한 본 발명의 농축장치 및 농축방법에 의하면 농축튜브 내의 전열면이 자체적으로 세정되므로 농축효율을 증가시킬 수 있다.The present invention relates to a concentrating device and a concentration method, the first and second liquid inlet, the first and second concentrated tube, the first and second liquid outlet, the steam supply line and the condensate discharge line, the first and second One of the first and second liquid supply lines by a concentrating device comprising a waste steam discharge line, first and second liquid circulation lines, first and second concentrated liquid discharge lines, and first and second liquid supply lines. Supply the solution continuously by opening the shutoff valve of the liquid supply line of the liquid supply line, and open the shutoff valve of the concentrate discharge line connected to the other one of the first and second liquid supply lines for a predetermined time every predetermined time. The concentrated liquid is discharged, and the liquid supply line to which the solution is supplied and the concentrated liquid discharge line from which the concentrated liquid is discharged are alternately switched with other liquid supply lines and the concentrated liquid discharge line at predetermined time intervals. According to the concentrating device and the concentrating method of the present invention, since the heat transfer surface in the concentrating tube is self-cleaned, the concentrating efficiency can be increased.
Description
본 발명은 농축장치 및 농축방법에 관한 것으로, 특히 농축운전중에 농축튜브 내의 전열면이 자체적으로 세정되는 농축장치 및 농축방법에 관한 것이다.The present invention relates to a concentration apparatus and a concentration method, and more particularly, to a concentration apparatus and a concentration method in which the heat transfer surface in the concentration tube itself is cleaned during the concentration operation.
농축장치는 통상 고형분이 함유된 용액에서 수분을 증발시켜 고형분의 성분을 농축시켜 농축액을 만든다.Concentrators usually evaporate moisture from a solution containing solids to concentrate the components of the solids to form a concentrate.
종래의 농축장치(1)는, 도 1에 도시된 바와 같이, 하나의 액유입부(10)와, 상기 액유입부(10)에 모두 연결된 다수의 농축튜브(20)와, 상기 다수의 농축튜브(20)가 모두 연결된 하나의 액유출부(30)로 구성되어 있다.As shown in FIG. 1, the conventional concentrator 1 includes one liquid inlet 10, a plurality of condensation tubes 20 connected to all of the liquid inlet 10, and the plurality of concentrators. The tube 20 is composed of one liquid outlet 30 is connected to all.
용액은 액공급라인(80)을 통해 액유입부(10)로 유입된 다음 다수의 농축튜브(20)의 내부를 통과한 후 액유출부(30)로 유입된다. 농축튜브(20)의 외면에는 증기공급라인(40)과 응축수배출라인(50)이 연결되며, 증기공급라인(40)을 통해 공급된 증기는 농축튜브(20)의 내부를 통과하는 용액을 증발시켜 농축시킨 후응축수로 되며 응축수배출라인(50)을 통해 배출된다. 농축튜브(20)를 통과하면서 증발된 용액의 폐증기와 농축액은 액유출부(30)로 유입된다. 액유출부(30) 내의 폐증기는 폐증기배출라인(60)을 통해 소정의 처리공정으로 이송되고, 액유출부(30) 내의 농축액은 농축액배출라인(70)을 통해 소정의 처리공정으로 이송된다.The solution flows into the liquid inlet 10 through the liquid supply line 80 and then passes through the interior of the plurality of concentrating tubes 20 and then flows into the liquid outlet 30. The outer surface of the condensation tube 20 is connected to the steam supply line 40 and the condensate discharge line 50, the steam supplied through the steam supply line 40 evaporates the solution passing through the interior of the condensation tube 20 After condensation, it becomes condensate and is discharged through the condensate discharge line 50. Waste steam and the concentrate of the evaporated solution while passing through the concentration tube 20 is introduced into the liquid outlet (30). The waste steam in the liquid outlet part 30 is transferred to a predetermined treatment process through the waste steam discharge line 60, and the concentrated liquid in the liquid outlet part 30 is transferred to the predetermined treatment process through the concentrated liquid discharge line 70. do.
이러한 종래의 농축장치(1)는 용액이 농축튜브(20) 내를 단 1회 흘러내리게 구성되어 있으므로 원하고자 하는 농축액을 얻기 위해서는 농축튜브(20) 내에서의 증발율이 높게 해야 된다. 이렇게 농축튜브(20) 내에서의 증발율을 높게 하기 위해서는 농축튜브(20)의 외부면에 단위시간당 접촉되는 증기의 양을 크게 해야 하며, 또한 증발율이 높을수록 농축튜브(20) 내의 전열면에 스케일이 생성되는 비율이 높아지게 된다. 따라서, 농축튜브(20) 내의 전열면에 생성된 스케일로 인해 농축장치의 농축효율이 감소되고, 또한 농축튜브(20) 내의 전열면에 생성된 스케일을 청소하는데 시간이 많이 소요된다는 단점이 있다.Since the conventional concentrator 1 is configured so that the solution flows down the concentration tube 20 only once, the evaporation rate in the concentration tube 20 must be high in order to obtain a desired concentration solution. In order to increase the evaporation rate in the condensation tube 20, the amount of vapor contacted to the outer surface of the condensation tube 20 per unit time must be increased. The rate at which this is produced becomes high. Therefore, due to the scale generated on the heat transfer surface in the condensation tube 20, the concentration efficiency of the concentrating device is reduced, and it also takes a long time to clean the scale generated on the heat transfer surface in the condensation tube 20.
따라서, 본 발명은 상술한 바와 같은 문제점을 해결하고자 창출된 것으로서, 본 발명의 목적은 농축장치의 액유입부, 농축튜브 및 액유출부를 다수의 섹션으로 구분하고 다수의 액공급라인 및 액순환라인을 구성한 후, 농축운전중 각각의 섹션에 대한 용액 공급방향과 농축액배출방향을 소정시간마다 변환시킴으로써 희액이 각각의 섹션에 연결된 농축튜브 내를 교번적으로 순환되도록 하여 농축튜브 내의 전열면이 자체적으로 세정되는 농축장치 및 농축방법을 제공하는데 있다.Therefore, the present invention was created to solve the problems described above, an object of the present invention is to divide the liquid inlet, the concentration tube and the liquid outlet of the condenser into a plurality of sections and a plurality of liquid supply line and liquid circulation line After the condensation operation, the solution feed direction and the concentrate discharge direction of each section during the concentration operation are changed at predetermined time intervals so that the solution is circulated alternately in the concentrate tube connected to each section so that the heat transfer surface in the concentrate tube is itself. It is to provide a concentrator and a concentration method to be washed.
도 1은 종래의 농축장치를 도시한 도면, 및1 is a view showing a conventional thickening apparatus, and
도 2는 본 발명에 따른 농축장치를 도시한 도면이다.2 is a view showing a concentrating device according to the present invention.
상기한 바와 같은 목적 달성을 위하여, 본 발명에 의한 농축장치는 분리벽에 의해 서로 구분된 제1 및 제2 액유입부, 상기 제1 및 제2 액유입부의 하부에 각각 연결된 제1 및 제2 농축튜브, 상기 제1 및 제2 농축튜브의 하부에 각각 연결되며 중간에 구멍이 형성된 분리벽에 의해 서로 구분된 제1 및 제2 액유출부, 상기 제1 및 제2 농축튜브의 외면에 연결된 증기공급라인 및 응축수배출라인, 상기 제1 및 제2 액유출부의 각각의 측벽에 각각 연결된 제1 및 제2 폐증기배출라인, 상기 제1 및 제2 액유입부와 액유출부를 외부에서 각각 연결하며 펌프를 각각 구비한 제1 및 제2 액순환라인, 상기 제1 및 제2 액순환라인의 각각의 펌프의 하류에 각각 연결되며 차단밸브를 각각 구비한 제1 및 제2 농축액배출라인, 및 상기 제1 및 제2 액순환라인의 각각의 펌프의 상류에 각각 연결되며 차단밸브를 각각 구비한 제1 및 제2 액공급라인을 포함하는 것을 특징으로 한다.In order to achieve the object as described above, the concentrating device according to the present invention is the first and second liquid inlet portion separated from each other by the separation wall, the first and second connected to the lower portion of the first and second liquid inlet portion, respectively First and second liquid outlets connected to the thickening tube, the lower part of the first and the second thickening tube, respectively, and separated from each other by a separating wall having a hole in the middle, and connected to the outer surfaces of the first and second thickening tubes. A steam supply line and a condensate discharge line, first and second waste steam discharge lines respectively connected to the respective sidewalls of the first and second liquid outlets, and externally connect the first and second liquid inlet parts and the liquid outlet part, respectively. First and second liquid circulation lines having pumps, respectively; first and second concentrated liquid discharge lines respectively connected downstream of each pump of the first and second liquid circulation lines and having shut-off valves, and Upstream of each pump of the first and second liquid circulation lines It is characterized in that it comprises a first and a second liquid supply line connected to each and provided with a shutoff valve, respectively.
또한, 본 발명에 의한 농축방법은 제1 및 제2 액공급라인 중 하나의 액공급라인의 차단밸브를 개방하여 용액을 연속적으로 공급하고, 제1 및 제2 액공급라인 중 다른 하나의 액공급라인에 연결되는 농축액배출라인의 차단밸브를 소정시간마다 소정시간동안 개방하여 농축액을 배출하며, 상기 용액이 공급되는 액공급라인과 농축액이 배출되는 농축액배출라인을 소정시간 간격마다 다른 액공급라인 및 농축액배출라인과 교번적으로 전환시키는 것을 특징으로 한다.In addition, the concentration method according to the present invention by continuously supplying the solution by opening the shut-off valve of one of the first and second liquid supply line of the liquid supply line, the liquid supply of the other of the first and second liquid supply line Opening the shut-off valve of the concentrate discharge line connected to the line for a predetermined time for a predetermined time to discharge the concentrate, the liquid supply line to the solution supply and the concentrate discharge line to discharge the concentrate at different intervals every other liquid supply line and It is characterized by alternating with the concentrate discharge line.
이하 첨부된 도면을 참조하면서 본 발명에 따른 농축장치 및 농축방법에 대하여 상세하게 설명하기로 한다.Hereinafter, a concentration apparatus and a concentration method according to the present invention will be described in detail with reference to the accompanying drawings.
본 발명의 농축장치(100)는, 도 2에 도시된 바와 같이, 제1 및 제2 액유입부(110, 110'), 제1 및 제2 농축튜브(120, 120'), 제1 및 제2 액유출부(130,130'), 증기공급라인(140), 응축수배출라인(150), 제1 및 제2 폐증기배출라인(160, 160'), 제1 및 제2 액순환라인(170, 170'), 제1 및 제2 농축액배출라인(180, 180'), 제1 및 제2 액공급라인(190, 190')으로 구성된다.As shown in FIG. 2, the concentrating device 100 of the present invention includes first and second liquid inlets 110 and 110 ', first and second thickening tubes 120 and 120', and first and second concentrators. Second liquid outlet 130, 130 ', steam supply line 140, condensate discharge line 150, the first and second waste steam discharge line (160, 160'), the first and second liquid circulation line 170 170 '), the first and second concentrated liquid discharge lines 180 and 180', and the first and second liquid supply lines 190 and 190 '.
제1 액유입부(110)와 제2 액유입부(110')는 분리벽(111)에 의해 서로 구분되어 있으며, 제1 액유출부(130)와 제2 액유출부(130')는 제1 액유입부(110)와 제2 액유입부(110')가 구분된 것에 대응되게 분리벽(131)에 의해 구분되어 있다. 제1 액유출부(130)와 제2 액유출부(130')를 구분하는 분리벽(131)의 중간에는 구멍(131a)이 형성되어 있어 제1 액유출부(130)의 농축액과 제2 액유출부(130')의 농축액이 서로 혼합되게 한다.The first liquid inlet 110 and the second liquid inlet 110 'are separated from each other by the separating wall 111, and the first liquid inlet 130 and the second liquid inlet 130' The first liquid inlet part 110 and the second liquid inlet part 110 ′ are divided by the separating wall 131 to correspond to the distinction. A hole 131a is formed in the middle of the dividing wall 131 that separates the first liquid outflow unit 130 and the second liquid outflow unit 130 '. The concentrates of the liquid outlet 130 'are mixed with each other.
제1 및 제2 액유입부(110, 110')와 제1 및 제2 액유출부(130, 130') 사이에는 제1 및 제2 농축튜브(120, 120')가 각각 연결되어 있다. 농축튜브는 다수의 튜브들이 다발로 구성된 형태이다.First and second concentration tubes 120 and 120 'are connected between the first and second liquid inlets 110 and 110' and the first and second liquid outlets 130 and 130 ', respectively. The thickening tube is a form in which a plurality of tubes are bundled.
농축튜브(120, 120')의 외면에는 증기공급라인(140)과 응축수배출라인(150)이 연결되며, 증기공급라인(140)을 통해 공급된 증기는 농축튜브(120, 120')의 내부를 통과하는 용액을 증발시켜 농축시킨 후 응축수로 되며 응축수배출라인(150)을 통해 배출된다.Steam supply line 140 and the condensed water discharge line 150 is connected to the outer surface of the concentrated tube (120, 120 '), the steam supplied through the steam supply line 140 is the inside of the concentrated tube (120, 120') After evaporating and concentrating the solution passing through the condensed water is discharged through the condensate discharge line 150.
제1 액유출부(130)와 제2 액유출부(130')의 각각의 측벽에는 제1 및 제2 폐증기배출라인(160, 160')이 각각 연결되어 있다. 농축튜브(120, 120')를 통과하면서 증발된 용액의 폐증기는 액유출부(130, 130')로 유입된 후 각각 폐증기배출라인(160, 160')을 통해 소정의 처리공정으로 이송된다.First and second waste steam discharge lines 160 and 160 'are connected to sidewalls of the first liquid outlet 130 and the second liquid outlet 130', respectively. Waste steam of the solution evaporated while passing through the concentrated tubes (120, 120 ') is introduced into the liquid outlet (130, 130') and then transferred to a predetermined treatment process through the waste steam discharge lines (160, 160 '), respectively. do.
제1 액유입부(110)와 제1 액유출부(130)는 외부에서 제1 액순환라인(170)으로 연결되어 있으며, 제2 액유입부(110')와 제2 액유출부(130')는 외부에서 제2 액순환라인(170')으로 연결되어 있다. 제1 및 제2 액순환라인(170, 170')에는 제1 및 제2 펌프(171, 171')가 각각 설치되어 있다. 펌프(171, 171')는 농축튜브(120, 120')를 통과한 액유출부(130, 130')의 용액을 제1 및 제2 액순환라인(170, 170')을 거쳐 액유입부(110, 110')로 순환시키는데, 농축튜브(120, 120') 내를 흘러내리는 용액의 양이 액공급량의 8-10배 정도가 되도록 순환시킨다.The first liquid inlet 110 and the first liquid outlet 130 are connected to the first liquid circulation line 170 from the outside, the second liquid inlet 110 'and the second liquid outlet 130 ') Is connected to the second liquid circulation line 170' from the outside. First and second pumps 171 and 171 'are respectively installed in the first and second liquid circulation lines 170 and 170'. The pumps 171 and 171 'pass the solution of the liquid outlet portions 130 and 130' that have passed through the thickening tubes 120 and 120 'through the first and second liquid circulation lines 170 and 170'. (110, 110 '), the amount of the solution flowing down the concentration tube (120, 120') is circulated to be about 8-10 times the liquid supply amount.
제1 및 제2 액순환라인(170, 170')의 제1 및 제2 펌프(171, 171')의 하류에는 제1 및 제2 농축액배출라인(180, 180')이 각각 연결되며, 제1 및 제2 액순환라인(170, 170')의 제1 및 제2 펌프(171, 171')의 상류에는 제1 및 제2 액공급라인(190, 190')이 각각 연결된다.First and second concentrated liquid discharge lines 180 and 180 'are connected downstream of the first and second pumps 171 and 171' of the first and second liquid circulation lines 170 and 170 ', respectively. First and second liquid supply lines 190 and 190 'are connected upstream of the first and second pumps 171 and 171' of the first and second liquid circulation lines 170 and 170 ', respectively.
제1 및 제2 농축액배출라인(180, 180')에는 제1 및 제2 차단밸브(181, 181')가 각각 연결되며, 제1 및 제2 액공급라인(190, 190')에는 제1 및 제2 차단밸브(191, 191')가 각각 연결된다. 제1 및 제2 액공급라인(190, 190')은 하나의 액공급라인이 분기된 형태이다.First and second shut-off valves 181 and 181 'are connected to the first and second concentrated liquid discharge lines 180 and 180', respectively, and first and second liquid supply lines 190 and 190 'are respectively connected to the first and second liquid supply lines 190 and 190'. And second shut-off valves 191 and 191 'are respectively connected. The first and second liquid supply lines 190 and 190 'have one liquid supply line branched.
농축운전시, 먼저 제1 액공급라인(190)의 제1 차단밸브(191)를 개방하여 용액을 공급하면 용액은 제1 액순환라인(170)의 제1 펌프(171)에 의해 제1 액유입부(110)로 유입된다. 액유입부(110)로 유입된 용액은 제1 농축튜브(120)를 거치면서 소정량이 증기에 의해 증발된 폐증기와 농축액의 상태로 제1 액유출부(130)로 유입된다. 제1 액유출부(130)로 유입된 폐증기는 제1 폐증기배출라인(160)을 통해 배출된다. 제1 액유출부(130)로 유입된 농축액은 일부는 제1 액순환라인(170)으로 유입되어 제1 펌프(171)에 의해 다시 제1 액유입부(110)로 유입되고, 일부는 구멍(131a)을 통해 제2 액유출부(130')로 유입된다.In the concentration operation, first, when the first shutoff valve 191 of the first liquid supply line 190 is supplied to supply a solution, the solution is first liquid by the first pump 171 of the first liquid circulation line 170. Inflow to the inlet 110. The solution introduced into the liquid inlet 110 is introduced into the first liquid outlet 130 in a state of waste steam and a concentrated liquid evaporated by a predetermined amount while passing through the first concentrated tube 120. The waste steam introduced into the first liquid outlet 130 is discharged through the first waste steam discharge line 160. The concentrated liquid introduced into the first liquid outlet 130 is partially introduced into the first liquid circulation line 170, and then flows back into the first liquid inlet 110 by the first pump 171, and a portion of the concentrated liquid. It flows into the second liquid outlet part 130 'through 131a.
제1 액순환라인(170)으로 유입된 농축액은 제1 액공급라인(190)으로부터 공급된 새로운 용액과 합쳐져서 제1 액유입부(110)로 유입된 후 다시 제1 농축튜브(120)를 거쳐 제1 액유출부(130)로 유입된다. 제2 액유출부(130')로 유입된 농축액은 제2 액순환라인(170')의 제2 펌프(171')에 의해 제2 액유입부(110')로 유입된 후 제2 농축튜브(120')를 거쳐 제2 액유출부(130')로 유입된다. 여기에서, 순환 도중에 새로운 용액을 공급받은 후 제1 농축튜브(120)를 거친 농축액은 순환 도중에 새로운 용액을 공급받지 않고 제2 농축튜브(120')를 거친 농축액보다 양이 많고 농도가 낮으며, 따라서 제1 액유출부(130) 내의 농축액의 수면이 제2 액유출부(130') 내의 농축액의 수면보다 높게 되므로 제1 액유출부(130) 내의 농축액이 구멍(131a)을 통해 제2 액유출부(130')로 유입된다.The concentrated liquid introduced into the first liquid circulation line 170 is combined with the new solution supplied from the first liquid supply line 190, introduced into the first liquid inlet 110, and then again passed through the first concentrated tube 120. It flows into the first liquid outlet 130. The concentrated liquid introduced into the second liquid outlet 130 'is introduced into the second liquid inlet 110' by the second pump 171 'of the second liquid circulation line 170' and then the second concentrated tube. It is introduced to the second liquid outlet portion 130 'via 120'. Herein, the concentrate passed through the first concentrate tube 120 after receiving the new solution in circulation is more plentiful and has a lower concentration than the concentrate passed through the second concentrate tube 120 'without receiving the fresh solution during circulation. Therefore, since the surface of the concentrate in the first liquid outlet 130 is higher than the surface of the concentrate in the second liquid outlet 130 ′, the concentrate in the first liquid outlet 130 is formed through the hole 131a. It flows into the outlet 130 '.
이러한 방식으로 농축운전을 계속하여 제2 액유출부(130') 내의 농축액의 농도가 원하는 정도로 되면 제2 농축액배출라인(180)의 제2 차단밸브(181')를 소정시간동안 개방하여 농축액을 배출시킨다.When the concentration operation is continued in this manner and the concentration of the concentrate in the second liquid outlet 130 ′ is as desired, the second shutoff valve 181 ′ of the second concentrate discharge line 180 is opened for a predetermined time. Discharge it.
이와 같은 농축운전방식은 농축액이 순환되는 방식으로서, 종래와 같이 용액이 1회만 농축튜브 내를 흘러내려 증발시키는 방식이 아니므로 농축튜브 내에서의 증발율을 높일 필요가 없다. 따라서, 농축튜브의 외부면에 단위시간당 접촉되는 증기의 양이 작아도 되므로 농축튜브 내의 전열면에 스케일이 생성되는 비율이 낮아지게 된다.Such a concentrated operation method is a way in which the concentrate is circulated, and thus, the solution does not need to increase the evaporation rate in the concentrate tube because the solution flows only once in the concentrate tube and evaporates. Therefore, since the amount of steam contacting the outer surface of the thickening tube per unit time may be small, the rate at which scale is generated on the heat transfer surface in the thickening tube is reduced.
또한, 전술한 운전방식에 의하면, 제1 액순환라인(170)에 새로운 용액이 계속적으로 공급되므로 제1 농축튜브(120) 내에는 항상 제2 농축튜브(120') 보다 농도가 낮은 희액이 흐르게 된다. 따라서, 희액이 제1 농축튜브(120) 내를 여러회 순환하면서 제1 농축튜브(120) 내의 전열면에 생성된 스케일을 자동적으로 세척하게 된다.In addition, according to the above-described operating method, since a new solution is continuously supplied to the first liquid circulation line 170, the noble liquid having a lower concentration than the second concentrated tube 120 'always flows in the first concentrated tube 120. do. Therefore, while the rare fluid circulates in the first concentrated tube 120 several times, the scale generated on the heat transfer surface in the first concentrated tube 120 is automatically washed.
이렇게 농축운전을 하는 중에, 소정 시간 경과후 용액공급방향과 농축액배출방향을 바꾸어서, 제1 액공급라인(190)의 제1 차단밸브(191)를 폐쇄하고 제2 액공급라인(190')의 제2 차단밸브(191')를 개방함과 동시에, 제2 농축액배출라인(180')의 제2 차단밸브(181')를 폐쇄하고 제1 농축액배출라인(180)의 제1 차단밸브(181)를 소정간격으로 소정시간동안 개방하면 제2 농축튜브(120') 내를 흐르는 용액이 희액이 되므로 제2 농축튜브(120') 내의 전열면에 생성된 스케일을 자동적으로 세척하게 된다.During the concentration operation, after the predetermined time elapses, the solution supply direction and the concentrate discharge direction are changed to close the first shutoff valve 191 of the first liquid supply line 190 and the second liquid supply line 190 ' At the same time as opening the second shut-off valve 191 ', the second shut-off valve 181' of the second concentrate discharge line 180 'is closed and the first shut-off valve 181 of the first concentrate discharge line 180 is closed. ) Is opened at a predetermined interval for a predetermined time, so that the solution flowing in the second thickening tube 120 'becomes a diluted solution, thereby automatically washing the scale generated on the heat transfer surface in the second thickening tube 120'.
이러한 방식으로 용액공급방향과 농축액배출방향을 소정시간 간격마다 교번적으로 전환하면 농축운전을 하면서 자동적으로 제1 및 제2 농축튜브(120, 120') 내부의 전열면을 세정할 수 있다.In this way, by alternately switching the solution supply direction and the concentrated liquid discharge direction at predetermined time intervals, it is possible to automatically clean the heat transfer surfaces inside the first and second concentrated tubes 120 and 120 'during the concentration operation.
이상으로 본 발명의 실시예에 대하여 설명하였다. 그러나 본 발명은 그 주요 특징을 이루는 사상을 벗어나지 않으면서 다른 특정 형태로 실시될 수 있다. 본원 발명은 본원 청구범위에 의해서만 한정될 수 있다.In the above, the Example of this invention was described. However, the present invention may be embodied in other specific forms without departing from the spirit constituting its main features. The invention may be limited only by the claims herein.
전술한 바와 같이, 본 발명의 농축장치 및 농축방법에 의하면, 농축튜브 내의 전열면이 자체적으로 세정되므로 농축효율을 증가시킬 수 있다.As described above, according to the concentrating device and the concentrating method of the present invention, since the heat transfer surface in the concentrating tube is self-cleaned, the concentrating efficiency can be increased.
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