KR200303111Y1 - multi-effect concentrating system - Google Patents

Abstract

The present invention relates to a multi-utility concentrating system, wherein the decompression device (10) is a vacuum pump consisting of one unit, and condensate storage for condensate discharged from the second heat exchanger (2b) and the third heat exchanger (2c) / The downstream end of the condensate discharge pipe for discharging the condensate stored in the pressure storage tank, the upstream end is connected to the condenser 9, the downstream end is connected to the condensate feed pipe 114 connected to the decompression device 10, and each heat exchanger In the main body 102 of (2a ', 2b', 2c '), the inlet side waste liquid chamber 105 which is divided by the upper part 112a and the lower part by the plate 112b, respectively, and spaced apart from each other in the vertical axis direction, and An outlet side waste liquid chamber 108 is formed, and the inlet side and the outlet side waste liquid chambers 105 and 108 are connected to each other by a plurality of heat transfer tubes 107 to form a heat exchanger, and an upper portion of the inlet side feature liquid chamber 105 is formed. In the waste liquid inlet pipe 101 is provided concentrically with the vertical axis of the main body 102, the tip is The waste liquid inlet 106 is provided to be positioned in the center portion on the vertical axis of the inlet waste liquid chamber 105 and connected to the downstream end of the circulation line branched in the middle of the concentrate conveying pipe at the bottom of the inlet waste liquid chamber 105. Here, the downstream end of the waste liquid inlet 106 is connected to the inlet side waste liquid chamber 105 at a level lower than the downstream end of the waste liquid inlet tube 101.

Description

Multi-effect concentrating system

The present invention relates to a multi-utility concentrating system. More specifically, in condensing wastewater or pharmaceutical liquids by a multi-utility concentrating device, the transfer of steam and concentrate to each stage is carried out by using a pressure difference of each stage. The present invention relates to an improvement on a multi-utility concentration system capable of obtaining low water content concentrates and high purity pure water.

The applicant has filed the multi-utility enrichment system, as disclosed in Korean Patent Publication No. 2002-0024230. Referring to FIG. 3, the conventional multi-utility concentration system is as follows.

In Fig. 3, reference numeral 1 denotes a waste liquid tank, 2a, 2b, and 2c, each of which is a known first, second and third heat exchanger for heating the waste liquid with an outer tube not shown inside and an inner tube for waste liquid. , 3, 4, and 5 are the first, second and third evaporator, 20 sludge tank, 30 is a circulating water tank, 9 is a condenser, 10 is provided with a high-pressure pump (10a) and an ejector (10b) It is a vacuum device which reduces the pressure inside the condenser 9.

The first, second and third evaporative concentrators 3, 4 and 5 and the first, second and third heat exchangers 2a, 2b and 2c are the first heat exchanger 2a and the first evaporator. (3), the second heat exchanger (2b), the second evaporator concentrator (4), the third heat exchanger (2c), the third evaporator concentrator (5) in order, the third evaporator (5) The vacuum pipe 10 communicates with the condenser 9 under reduced pressure by way of the third evaporative vapor transfer pipe 112, and the inner tube for the waste liquid of the first heat exchanger 2a opens and closes the first electrons. Via the waste liquid inflow pipe 101 provided with the valve V1, it communicates with the waste liquid tank 1 under the control of the said 1st electromagnetic opening / closing valve V1.

The heated waste liquor outlet side of the first, second and third heat exchangers 2a, 2b and 2c and the heated waste liquor inlets of the first, second and third evaporator concentrators 3, 4 and 5 are respectively Communicating with each other by the first, second and third heated waste liquid discharge pipes 102, 105 and 110, and the concentrated waste liquid outlet side of the first and second evaporator 3, 4 and the second. And first and second concentrate liquid conveying tubes 104 each having a concentrated solenoid inlet side of the third heat exchanger 2b and 2c having a second solenoid valve V2 and a third solenoid valve V3, respectively. 109 communicates with each other under the control of the second solenoid valve V2 and the third solenoid valve V3.

The concentrated waste liquid outlet side of the evaporative concentrator 5 is connected to the upper end of the sludge tank 20 and to the other end of the concentrate conveying pipe 113 having the ninth electromagnetic opening and closing valve V9 on the way. And the first and second evaporative concentrators disposed directly upstream and respectively at the steam inlet sides of the second and third heat exchangers 2b and 2c except for the steam appearance of the first heat exchanger 2a. 3, 4) The outlet side for steam communicates with each other by each of the first and second evaporative vapor transfer pipes 103 and 108.

Further, a first condensed water discharge pipe 107 having one end connected to an upper end of the first condensed water storage / accumulation tank 201 is connected to the outlet side of the steam appearance of the second heat exchanger 2b.

In addition, the first condensate storage / accumulation tank 201 includes a first level sensor LS1 that detects a level of condensate stored in the tank 201, and is controlled by the first level sensor LS1. When the condensed water is stored in the tank 201 to a predetermined level, the fourth condensed water discharge pipe 402 connected to the lower end of the tank 201 and provided with a fourth electronic control valve V4 is provided. In accordance with the control of the electronic control valve (V4), the condensed water stored in the tank 201 is discharged.

The first condensate storage / accumulation tank 201 is higher than the predetermined level and is lower than the upper position where the first condensate discharge pipe 107 is connected to the tank 201, thereby transferring the second evaporative steam. It is connected to the other end of the 1st pressure control pipe 401 which one end is connected in the middle of the pipe 108.

The pressure regulating pipe 401 is provided with a fifth solenoid valve V5, and a first pressure sensing / regulator (V / S1) between the fifth solenoid valve V5 and the tank 201. ) Is provided.

Further, a second condensed water discharge pipe 111, one end of which is connected to an upper end of the second condensed water storage / accumulation tank 202, is connected to the outlet side of the steam external appearance of the third heat exchanger 2c, and the second The first condensate discharge pipe 402 for discharging the condensate stored in the first condensate storage / accumulation tank 201 is connected to an upper end of the two condensate storage / accumulation tank 202.

The second condensate storage / accumulation tank 202 has a second level sensor LS2 for sensing the level of condensate stored in the tank 202, and is controlled by the second level sensor LS2. When the condensate is stored to a predetermined level in the 202, one end is connected to the lower end of the tank 202, the other end is connected in the middle of the third evaporative steam transfer pipe 112, and between the one end and the other end The condenser 9 stores the condensed water stored in the tank 202 under the control of the sixth electromagnetic opening and closing valve V6 via the second condensate discharge pipe 404 having the sixth electromagnetic opening and closing valve V6. Drain on.

The second condensate storage / accumulation tank 202 is higher than the predetermined level and is lower than the upper position where the second condensate discharge pipe 111 is connected to the tank 201. It is connected to the other end of the 2nd pressure control pipe 403 which one end is connected in the middle of the pipe 112. As shown in FIG. Here, one end of the second pressure control pipe 403 may be directly connected to the third evaporator 5 instead of being connected to the third evaporator feed pipe 112.

The second pressure control pipe 403 is provided with a seventh electromagnetic open / close valve V7, and a second pressure sensing / regulator V between the seventh electronic open / close valve V7 and the tank 202. / S2) is provided.

In addition, the sludge tank 20 has a third level sensor LS3 for detecting the level of the concentrated liquid stored in the sludge tank 20, and the sludge tank (3) is provided by the third level sensor LS3. 20, when the condensate is stored to a predetermined level, one end is connected to the lower end of the sludge tank 20, the other end is through the atmosphere, and there is provided a tenth solenoid valve V10 between the one end and the other end. Via the concentrated liquid discharge pipe 406, the concentrated liquid stored in the sludge tank 20 is discharged to the outside under the control of the tenth electronic open / close valve V10.

And, the sludge tank 20 is higher than the predetermined level and lower than the upper position where the concentrate conveying pipe 113 is connected to the sludge tank 20, among the second pressure control pipe 403 One end of the connection between the second pressure control pipe 403 and the third evaporative steam transport pipe 112 and the seventh solenoid valve V7 is connected to the eighth solenoid valve V8. It is connected to the other end of the provided branch line 405. In addition, the sludge tank 20 is a pneumatic line 407, one end of which is connected to the pneumatic pump 50 at the opposite side to which the other end of the branch line 405 is connected, and the eleventh electromagnetic opening and closing valve V11 is provided. Is connected to the other end of the

Here, when the concentrate is stored in the sludge tank 20 to a predetermined level, the eighth and ninth solenoid valves V8 and V9 are closed, and the tenth and eleventh solenoid valves V10 and V11 are closed. When operating the pneumatic pump 50 in the open state, the concentrated liquid stored up to a predetermined level in the sludge tank 20 can be forcibly discharged to the outside.

In addition, the vacuum apparatus 10 circulates the circulating water in the circulating water tank 30 in the order of the circulating water tank 30, the high pressure pump 10a, and the ejector 10b, and the condenser 9 is the ejector 10b. ) Is discharged to the circulating water tank (30) as pure water through the condensate feed pipe (114), one end of which is connected to the steam pipe of the condenser (9), and the other end of which is connected to the steam pipe of the condenser (9). , To reduce the pressure of the steam pipe of the condenser (9).

Referring to the operation of concentrating the waste liquid by the conventional multi-utility concentration system configured as described above are as follows.

First, in the state in which all the electromagnetic opening and closing valves V1 to V9 except the tenth and eleventh electromagnetic opening and closing valves V10 and V11 are opened, the vacuum device 10 including the high pressure pump 10a and the ejector 10b is opened. Condenser (9), third evaporator (5), third heat exchanger (2c), second evaporator (4), second heat exchanger (2b), first evaporator (3) and first heat exchanger (2a) are sequentially communicated by a plurality of pipes to reduce the internal pressure thereof, and at the same time, the first evaporator concentrator is provided by the first pressure sensing / regulating device V / S1 and the fifth solenoid valve V5. The internal pressure of (3) is set to the first predetermined pressure, and the internal pressure of the second evaporative concentrator 4 is set by the second pressure sensing / adjusting device V / S2 and the seventh solenoid valve V7. The second predetermined pressure lower than the first predetermined pressure but higher than the third predetermined pressure of the third evaporator 5 is set. In this case, the internal pressure of the third evaporator 5 is lower in the system flow than the first and second evaporators 3 and 4 so that the third evaporator 5 is closer to the vacuum device 10. Since it is arranged in the lower than the internal pressure of the first and second evaporator 3, 4, the third predetermined pressure of the third evaporator 5 can be set by the vacuum device (10) Can be.

Then, the waste liquid stored in the waste liquid tank 1 flows into the inner tube of the first heat exchanger 2a under reduced pressure via the waste liquid inflow tube 101 and is heated to a predetermined temperature.

Then, the waste liquid heated in the inner tube of the first heat exchanger (2a) is introduced into the first evaporator (3) under reduced pressure via the first waste liquid discharge pipe (102) to be centrifuged and separated into steam and waste liquid. It becomes a primary concentrate.

Then, the steam centrifuged in the first evaporator 3 passes through the first evaporative steam transfer pipe 103 to heat the first concentrated liquid introduced into the inner tube of the second heat exchanger 2b under reduced pressure. The first concentrated waste liquid discharged to the exterior of the second heat exchanger (2b) and centrifuged in the first evaporator (3) is passed through the first concentrate conveying pipe (104) to the second in the reduced pressure state. It transfers to the inner tube of the heat exchanger 2b, and is heated to predetermined temperature.

Then, the first concentrated liquid heated to a predetermined temperature in the inner tube of the second heat exchanger 2b flows into the second evaporator concentrator 4 via the second waste discharge tube 105, and the second heat exchanger. The steam which flows into the exterior of the machine 2b and heats the primary concentrate is discharged to the first condensed water storage / pressure tank 201 via the first condensed water discharge pipe 107.

Here, when the condensed water discharged to the first condensed water storage / accumulation tank 201 via the first condensed water discharge pipe 107 is stored in the first condensed water storage / accumulation tank 201 to a predetermined level, The four solenoid valve V4 is opened and transferred to the second condensate storage / accumulation tank 202 via the first condensate discharge pipe 402.

Then, the first concentrated liquid introduced into the second evaporator 4 via the second waste liquid discharge pipe 105 is centrifuged again to be separated into steam and waste liquid to become a secondary concentrated liquid.

Then, the steam centrifuged in the second evaporator 4, the second evaporated steam transfer pipe 108 to heat the secondary concentrated liquid introduced into the inner tube of the third heat exchanger (2c) under reduced pressure. The secondary concentrated waste liquid discharged to the exterior of the third heat exchanger 2c and centrifuged in the second evaporator 4 is passed through the second concentrate conveying pipe 109 to be discharged to the decompressed state. It transfers to the inner tube of the 3 heat exchanger 2c, and is heated to predetermined temperature.

Then, the secondary concentrate heated to a predetermined temperature in the inner tube of the third heat exchanger 2c flows into the third evaporator 5 via the third waste liquid discharge pipe 110, and the third heat exchange. The steam which flows into the exterior of the machine 2c and heats the secondary concentrate is discharged to the second condensed water storage / accumulation tank 202 via the second condensed water discharge pipe 111.

Here, the condensed water discharged to the second condensed water storage / accumulation tank 202 via the second steam discharge pipe 111 is combined with the condensed water introduced through the first condensed water discharge pipe 402 to form the second condensed water. When the storage / accumulation tank 202 is stored up to a predetermined level, the sixth electromagnetic opening and closing valve V6 is opened and discharged to the condenser 9 via the second condensate discharge pipe 402.

Then, the secondary concentrate introduced into the third evaporator 5 via the third waste liquid discharge pipe 110 is centrifuged to be separated into steam and waste liquid to form a tertiary concentrate.

Then, the steam centrifuged in the third evaporator 5 is introduced into the condenser 9 under reduced pressure via the third evaporative steam transfer pipe 112 to become condensed water of pure water, thereby condensate transfer pipe 114 ), Discharged to the circulating water tank 30 sequentially through the ejector 10b, and the third concentrated waste liquid centrifuged in the third evaporator 5 passes through the third concentrate conveying pipe 113. And the third concentrated waste liquid discharged to the sludge tank 20 is stored in the sludge tank 20 to a predetermined level, the eighth and ninth electromagnetic opening and closing valves V8, V9) is closed, the tenth and eleventh electromagnetic opening and closing valves V10 and V11 are opened and the pneumatic pump 50 is operated so that it is forcibly discharged to the outside via the concentrate discharge pipe 406.

In the conventional multi- utility concentrating system configured as described above, between the first heat exchanger (2a) and the first evaporator (3) via the first circulation line (L1) branched in the middle of the first concentrate transfer pipe (104) The first heat exchanger (2a) and the first evaporator (3) is in communication with each other, and branched between the second heat exchanger (2b) and the second evaporator (4) in the middle of the second concentrate transfer pipe (109) The second heat exchanger 2b and the second evaporator 4 are through each other via the second circulation line L2, and between the third heat exchanger 2c and the third evaporator 5, The third heat exchanger (2c) and the third evaporator (5) are passed through each other via the third circulation line (L3) branched in the middle of the concentrate feed pipe (113), so that the gas-liquid separation is carried out in the first evaporator (3). A part of the primary concentrate thus prepared is introduced and circulated into the first heat exchanger 2a for preheating and replenishment of the first heat exchanger 2a. A part of the secondary concentrate liquid-liquid separated in the condenser 4 is introduced into the second heat exchanger 2b for preheating and replenishment of the second heat exchanger 2b, and the third A part of the tertiary concentrate separated by gas-liquid separation in the evaporator 5 is introduced into the third heat exchanger 2c for preheating and replenishment of the third heat exchanger 2c.

However, as shown in FIG. 3, the respective levels of the downstream ends of the waste liquid supply pipes 101, 104, and 109 to be concentrated are located in the lower portion of each of the heat exchangers 2a, 2b, and 2c. The waste liquid to be concentrated supplied to each of the heat exchangers 2a, 2b, and 2c cannot be heated in each of the heat exchangers 2a, 2b, and 2c so as to be lower than the level of each downstream end of L3). Since each of the evaporative condensers 3, 4, and 5 flows back through L1, L2, and L3, the conventional multi-utility concentrating system has a problem that the desired waste liquid concentration cannot be achieved.

In addition, the conventional multi-utility concentration system, as shown in Figure 3, one end is stored in the second condensate water to discharge the condensate stored in the second condensate storage / storage tank 202 to the condenser (9) A second condensed water discharge pipe 404 is connected to the pressure storage tank 202 and the other end is connected to the third evaporative steam feed pipe 112.

The condenser is a condenser that is a device for cooling water vapor and returning it to water. The condenser is a closed container, and serves to reduce steam to water by taking away the evaporation heat of steam introduced by the supplied cooling water.

However, in the conventional multi-utility concentrating system, the condensate stored in the second condensate storage / accumulation tank 202 is unnecessarily passed through the second condensate discharge pipe 404 and the third evaporation steam conveying pipe 112. ), There is a problem that the efficiency of the condenser is lowered.

The present invention has been made to solve the above problems, wherein the level of each downstream end of the waste liquid supply pipe to be concentrated connected to the bottom of each heat exchanger is higher than the level of each downstream end of the circulation line connected to the bottom of each heat exchanger. And it is an object of the present invention to provide a multi-use concentrating system in which the second condensate discharge pipe is connected to a condensate feed pipe for discharging the condensate from the condenser.

1 is a view showing an improved multi-utility concentration system according to the present invention,

2 is a longitudinal sectional view of the lower end of the heat exchanger of the multi-utility condensation system of FIG. 1, and

Figure 3 shows a conventional multi-utility concentration system.

In order to achieve the above object, the present invention separates a first heat exchanger for heating a liquid, such as waste liquid, and a low concentration concentrate by separating steam of a component disposed downstream of the first heat exchanger and relatively easy to vaporize in the heated liquid. A first evaporator for obtaining a second heat exchanger disposed downstream of the first evaporator and using the steam separated from the first evaporator and the second heat exchanger; A second evaporator condensed to obtain a secondary condensate by separating steam of a component which is relatively easy to evaporate from the lower condensate heated and disposed downstream, and disposed downstream of the second evaporator, separated from the second evaporator And a third heat exchanger for heating the secondary concentrate using steam, and relatively evaporated in the heated secondary concentrate disposed downstream of the third heat exchanger. A third evaporator for separating high-density vapors to obtain a higher order concentrate, a condenser for liquefying steam separated from the third evaporator, disposed downstream of the third evaporator, and depressurizing the condenser. The internal pressure decreases in the order of the decompression device and the first heat exchanger, the first evaporator, the second heat exchanger, the second evaporator, the third heat exchanger, the third evaporator, and the condenser. And multiple pressure regulating means for adjusting the internal pressure of the first heat exchanger, the first evaporator, the second heat exchanger, the second evaporator, the third heat exchanger, and the third evaporator. In the utility concentration system, the decompression device is a vacuum pump consisting of one unit, and the condensate stored in the condensate storage / accumulation tank for condensate discharged from the second heat exchanger and the third heat exchanger. The downstream end of the condensate discharge pipe to be discharged is connected to the condensate feed pipe connected with the upstream end connected to the condenser and the downstream end connected to the decompression device. The inlet waste liquid chamber and the outlet waste liquid chamber are respectively divided and spaced apart from each other in the vertical axis direction. The inlet and outlet waste liquid chambers are connected to each other by a plurality of heat transfer tubes to form a heat exchange portion. The waste liquid inlet pipe is provided at the upper portion of the feature liquid chamber concentrically with the vertical axis of the main body, and its tip is located in the center portion on the vertical axis of the inlet waste liquid chamber, and the concentrate is transferred to the bottom of the inlet waste liquid chamber. The waste liquid inlet connected to the downstream end of the circulation line branched in the middle of the pipe is connected, where the downstream end of the waste liquid inlet is the waste liquid inlet. At a lower level than the downstream end of the tube is the multiple effect concentration system which is connected to the waste fluid inlet chamber.

Next, an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

Figure 1 schematically shows the overall flow configuration for a multi-utility enrichment system according to the present invention. In FIG. 1, the same reference numerals are given to the components of the multi-utility enrichment system of the present invention that are the same as the components of the conventional multi-utility enrichment system shown in FIG. 3, and the description of the components is described above. Since the description of the present invention is duplicated, the description of the present embodiment is omitted.

The multi-utility concentrating system shown in FIG. 1 is a multi-utility concentrating system for concentrating a liquid in multiple stages, and, like the conventional multi-utility concentrating system shown in FIG. 3, a first heat exchanger 2a for heating a liquid such as waste liquid or the like. ), A first evaporator (3) disposed downstream of the first heat exchanger (2a), for separating a vapor of a component that is relatively easy to vaporize from the heated liquid to obtain a lower concentration, and the first evaporator. A second heat exchanger (2b) disposed downstream of the concentrator (3) and heating the lower concentrate using the steam separated from the first evaporator and a downstream of the second heat exchanger (2b). The second evaporator 4 and a second evaporator 4 downstream of the second evaporator concentrator 4 to separate the steam of the component which is relatively easy to evaporate from the heated lower condensate to obtain a secondary car concentrate. Steam separated in (4) By separating the third heat exchanger (2c) for heating the secondary concentrate and the steam of a component that is relatively easy to evaporate in the heated secondary condensate is disposed downstream of the third heat exchanger (2c) to obtain a high-order concentrate A third evaporator (5), a condenser (9) disposed downstream of the third evaporator (5), for liquefying the vapor separated from the third evaporator (5), and the condenser (9) A decompression device 10 for reducing the pressure, and the first heat exchanger 2a, the first evaporator 3, the second heat exchanger 2b, the second evaporator 4, and the third heat exchanger. The first heat exchanger, the first evaporator, the second heat exchanger, and the second evaporator such that the internal pressure decreases in the order of the air 2c, the third evaporator 5, and the condenser 9 in order. A multi-use concentrating system having a pressure regulating means for adjusting the internal pressure of the concentrator, the third heat exchanger and the third evaporator concentrator. It is.

Since the connection relationship of each component as well as the pressure regulating means is the same as the conventional multi-utility concentration system, the description is replaced with the description of the conventional multi-utility concentration system described above.

However, the multi-utility concentrating system of this embodiment is different from each heat exchanger, the second condensed water discharge pipe and the vacuum apparatus with respect to the conventional multi-utility concentrating system.

First, as shown in FIG. 3, the conventional multi-utility concentrating system includes a high pressure pump 10a and an ejector 10b connected to each other to decompress the inside of the condenser 9 as shown in FIG. 3. Although it is a vacuum device, the multi-efficiency concentration system of the present embodiment, as shown in Figure 1, the vacuum device 10 is provided with a vacuum pump consisting of a unit to reduce the pressure of the inside of the condenser 9 The device reduces the number of parts needed to make the system.

In addition, the conventional multi-utility concentration system, as shown in Figure 3, the condensate stored in the second condensate storage / storage tank 202, the second condensate discharge pipe 404, the third evaporation steam transport pipe 112 Although it is configured to discharge to the condenser (9) in the order of), the multi-utility condensation system of the present embodiment, as shown in Figure 1, discharge the condensate stored in the second condensate storage / storage tank 202 A downstream end of the second condensate discharge pipe 404 to be connected to a vacuum pump 10 whose upstream end is connected to a condenser 9 and a downstream end thereof is a vacuum device, for discharging condensed water generated in the condenser 9, By connecting to the condensate transfer pipe 114, the efficiency of the condenser was increased.

In addition, each heat exchanger 2a ', 2b', 2c 'of the multi-utility concentration system of this embodiment has a different structure from each heat exchanger 2a, 2b, 2c of the conventional multi-utility concentration system.

The heat exchangers 2a ', 2b', and 2c 'of the present embodiment having a different configuration from the conventional heat exchangers have the same configuration, so that one of the heat exchangers 2a', 2b 'and 2c' is heat exchanged. Referring to Fig. 2 showing the group 2a ', the configuration of the heat exchanger of this embodiment is as follows.

In Fig. 2, reference numeral 102 denotes a main body of the heat exchanger 2a 'according to the present embodiment, in which the upper part is partitioned by a plate 112a and a lower part 112b, respectively. The inlet side waste liquid chamber 105 and the outlet side waste liquid chamber 108 spaced apart from each other in the vertical axis direction are formed. The inlet and outlet waste liquid chambers 105 and 108 are connected to each other by a plurality of heat transfer tubes 107 to constitute a heat exchange part. The inside of this heat exchanger tube 107 is a flow path of waste liquid, and the flow path of a heating steam is formed in the main body 102 with respect to this flow path. That is, the heating steam inlet 110 and the heating steam outlet 111 are provided at one side of the main body 102 adjacent to the inlet side and the outlet side waste liquid chambers 105 and 108, respectively, and a semicircular plate 113a therebetween. , 113b) are alternately arranged, and a flow path of heated steam meandering from the top to the bottom (snake movement) is formed.

On the other hand, the waste liquid inlet tube 101 is provided concentrically with the vertical axis of the main body 102 in the upper part of the inlet-side feature liquid chamber 105, and the front end is located in the center part on the vertical axis of the inlet waste liquid chamber 105. It is installed. At the downstream end of the waste liquid inlet pipe 101, a header 103 equipped with a plurality of spray nozzles 104 is attached, and the waste liquid flows from the header 103 through the spray nozzle 104 to the inlet side waste liquid chamber 105. It is supposed to be supplied to.

In addition, a first circulation line branched at the bottom of the inlet waste liquid chamber 105 in which the waste liquid concentrated by gas-liquid separation in an evaporator 3 disposed immediately downstream is branched in the middle of the first concentrate transfer pipe 104. A waste liquid inlet 106 is connected to a downstream end of the first circulation line L1 so as to be circulated to the heat exchanger via L1, through which the concentrated waste liquid is supplied to the inlet side. It flows into the waste liquid chamber 105 and circulates.

The downstream end of this waste liquid inlet 106 is connected to the inlet side waste liquid chamber 105 at a level lower than the downstream end of the waste liquid inlet tube 101, as shown in FIG. 2. Therefore, the waste liquid flowing into the inlet waste liquid chamber 105 via the waste liquid inlet pipe 101 flows into another heat exchanger or evaporative condenser downstream of the heat exchanger via the waste liquid inlet 106. Is prevented.

In addition, reference numeral 109 denotes a heated waste liquid outlet, which is connected to a first heated waste liquid discharge pipe 102 immediately downstream of the heat exchanger 2a, so that the heated waste liquid is discharged. Transfer to evaporator (3).

The present invention allows the number of parts of the decompression means to be reduced by the above configuration, and the waste liquid to be supplied to each heat exchanger cannot be heated in each of the heat exchangers and flows back through each circulation line. It is possible to achieve the desired waste liquid concentration by preventing the flow into each evaporator, and moreover, the condensate stored in the second condensate storage / storage tank is not supplied to the condenser 9, the efficiency of the condenser is reduced I can prevent that.

Claims (1)

A first heat exchanger (2a) for heating a liquid, such as waste liquid and the like, and downstream of the first heat exchanger (2a) is arranged to separate the vapor of the relatively easy to evaporate from the heated liquid to obtain a low concentration A second heat exchanger (2b) disposed downstream of the first evaporator (3) and the first evaporator (3) to heat the low concentration concentrate using the steam separated from the first evaporator (3); A second evaporator (4) and a second evaporator (evaporator) for separating a vapor of a component which is relatively easy to evaporate from the low concentration concentrate heated downstream of the second heat exchanger (2b) to obtain a secondary concentrate. A third heat exchanger 2c disposed downstream of 4) and heating the secondary concentrate using steam separated from the second evaporator 4; and downstream of the third heat exchanger 2c. Relatively easy to evaporate in the heated secondary concentrate A third evaporator 5 for separating the steam of the powder to obtain a higher concentration, and a condenser arranged at a downstream of the third evaporator 5 to liquefy the vapor separated from the third evaporator 5. (9), a decompression device (10) for depressurizing the condenser (9), and the first heat exchanger (2a), the first evaporator (3), the second heat exchanger (2b), and the first The first heat exchanger and the first evaporator concentrator so that the internal pressure decreases in the order of the two evaporator concentrators 4, the third heat exchanger 2c, the third evaporator concentrator 5, and the condenser 9. In the multi-use concentrating system having a pressure regulating means for adjusting the internal pressure of the second heat exchanger, the second evaporator, the third heat exchanger, the third evaporator, The decompression device 10 is a vacuum pump composed of one unit, The downstream end of the condensate discharge pipe for discharging the condensate stored in the condensate storage / accumulation tank for the condensate discharged from the second heat exchanger 2b and the third heat exchanger 2c, the upstream end is connected to the condenser 9 and downstream The stage is connected to the condensate feed pipe 114 connected to the decompression device 10, and In the main body 102 of each of the heat exchangers 2a ', 2b', and 2c ', the inlet side waste liquid is partitioned by an upper plate 112a and a lower plate 112b, respectively, and spaced apart from each other in the vertical axis direction. The chamber 105 and the outlet side waste liquid chamber 108 are formed, The inlet and outlet waste liquid chambers 105 and 108 are connected to each other by a plurality of heat transfer tubes 107 to constitute a heat exchange unit. The waste liquid inlet tube 101 is provided concentrically with the vertical axis of the main body 102 in the upper part of the inlet-side feature liquid chamber 105, and its front end is installed in the center part on the vertical axis of the inlet-side waste liquid chamber 105. It is, A waste liquid inlet 106 is connected to a bottom of the inlet waste liquid chamber 105 connected to a downstream end of a circulation line branched in the middle of the concentrate conveying pipe. Here, the downstream end of the waste liquid inlet (106) is connected to the inlet side waste liquid chamber (105) at a level lower than the downstream end of the waste liquid inlet pipe (101).