JP6764801B2 - Concentration system and concentration method - Google Patents

Description

The present invention relates to a concentration system and a concentration method.

Conventionally, as a technique in such a field, the drying apparatus described in Patent Document 1 below is known. This drying device has an evaporator for accommodating an object to be processed, a compressor for compressing water vapor transferred from the evaporator, and heat exchange with the object to be processed in the evaporator by passing the compressed water vapor as a heating medium. It is equipped with a heat exchange unit. The heat exchange unit has a heat transfer tube provided in the evaporator to act as a heating medium, and a steam jacket provided on the side surface of the container of the evaporator to exchange heat with the object to be processed via the wall surface of the evaporator.

Japanese Unexamined Patent Publication No. 2016-065658

However, in the drying apparatus of Patent Document 1, heat exchange is performed with the heating medium of the heat exchange section for the object to be processed in the state of being housed in the evaporator, so that heat transfer between the object to be processed and the heating medium is performed. There is a limit to increasing the area, and there is also a limit to improving the heating efficiency of the object to be treated. In this type of drying device (concentrating device), it is desired to improve the efficiency of the concentrating treatment as a whole by improving the heating efficiency of the object to be treated. An object of the present invention is to provide a concentration system and a concentration method for increasing the efficiency of concentration treatment of an object to be treated.

The concentration system of the present invention is a concentration system that concentrates the object to be processed by evaporating the solvent component of the object to be processed, which is a liquid, and is an evaporator in which the object to be processed is housed and an object to be processed in the evaporator. The first concentration processing unit is provided with a first concentration processing unit capable of concentrating the material to a predetermined concentration and a second concentration processing unit capable of concentrating the object to be processed to a concentration higher than the predetermined concentration. A first compression means that draws out and compresses the vapor of the solvent component in the evaporator to the outside, and an external heat exchanger that is provided outside the evaporator and the steam compressed by the first compression means is introduced as a heating medium, and evaporation. The second concentration processing unit has a circulation path for extracting the object to be processed in the vessel to the outside, exchanging heat with a heating medium by an external heat exchanger, and then circulating the material so that it is returned to the evaporator again. A second compression means for drawing out and compressing the steam in the evaporator to the outside and a steam compressed by the second compression means provided around the evaporator are introduced, and the vapor is condensed to dissipate the heat of condensation in the evaporator. It has a jacket portion to be attached to.

Further, a bypass line that can be opened and closed is provided in the flow path for transporting steam from the evaporator to the second compression means, and the bypass line has a condensing portion that cools and condenses the passing steam. May be good.

Further, the first compression means may have a roots blower, and the second compression means may have a swing compressor.

Further, the first compression means and the second compression means are shared by one common compression means, the steam flow path from the discharge port of the common compression means to the external heat exchanger, and the jacket portion from the discharge port of the common compression means. The steam flow path toward the air may be branched and provided.

Further, a bypass line that can be opened and closed is provided in the flow path for transporting steam from the evaporator to the common compression means, and the bypass line may have a condensing portion for cooling and condensing the passing steam. Good.

The common compression means may have a swing compressor.

The concentration method of the present invention is a concentration method for concentrating the object to be processed by evaporating the solvent component of the liquid object to be processed, and is a pre-concentration step in which at least the first concentration step for concentrating the object to be processed is executed. After the pre-concentration step, the object to be treated is concentrated through the second post-concentration step in which the second concentration step is executed with the first concentration step stopped, and in the first concentration step, the object to be treated is subjected to. The first compression step of drawing out and compressing the vapor of the solvent component in the contained evaporator to the outside and the steam compressed in the first compression step are introduced as a heating medium into an external heat exchanger provided outside the evaporator. The process includes a process of extracting the object to be processed in the evaporator to the outside, exchanging heat with a heating medium by an external heat exchanger, and then circulating a circulation path so as to return the object to the evaporator again. The second concentration step is a second compression step in which the steam in the evaporator is drawn out and compressed, and the steam compressed in the second compression step is introduced into a jacket portion provided around the evaporator to condense the steam. It has a step of applying heat of condensation to the evaporator.

The concentration method of the present invention further includes a concentration detection step of detecting the concentration of the object to be processed, which is executed in parallel with the first concentration step, and the concentration detected in the concentration detection step becomes a predetermined concentration. When it reaches, the first concentration step may be stopped and the early concentration step may be switched to the late concentration step.

According to the present invention, it is possible to provide a concentration system and a concentration method for increasing the efficiency of the concentration treatment of the object to be treated.

It is a figure which shows the enrichment system which concerns on 1st Embodiment. It is sectional drawing which shows the evaporator and the agitator. It is a figure which shows the enrichment system which concerns on 2nd Embodiment. It is a figure which shows the enrichment system which concerns on 3rd Embodiment. It is a figure which shows the enrichment system which concerns on 4th Embodiment.

Hereinafter, embodiments of the concentration system and the concentration method according to the present invention will be described in detail with reference to the drawings.

[First Embodiment]
The concentration system 1 shown in FIG. 1 is a system for concentrating the object A to be processed by evaporating the solvent component of the object A to be processed, which is a solution (liquid). In the following embodiments, "concentration" is not only a process of removing the solvent of the object A to be treated to increase the concentration, but also continuing the removal of the solvent component after a part of the solute component in the object A to be processed is precipitated. This is a concept that includes a treatment for processing and a “drying” treatment for removing almost all solvent components of the object A to be treated. The object A to be concentrated by the concentration system 1 includes, for example, leachate from a waste disposal site, muddy water / turbid water generated during construction work, sewage sludge and fermentation effluent from a sewage treatment plant, and accompanying fossil fuel mining. There are water, water-soluble cutting oil, VOC-contaminated water, VOC-contaminated soil, etc. Of these, the solvent component of leachate, muddy water / muddy water, sewage sludge, accompanying water, and water-soluble cutting oil at the waste disposal site is water, and the solvent component of the fermentation effluent is water or ammonia water, VOC contaminated water, The solvent component of VOC-contaminated soil is VOC. The concentration system 1 may finally remove almost all the solvent components in the object A to concentrate the object A until it becomes dry, for example, the object A is finally. It may be concentrated so as to be in powder form.

The concentration system 1 has a first concentration processing unit Q1 capable of concentrating the object A to a predetermined concentration, and a first concentration processing unit Q1 capable of further concentrating the object A concentrated in the first concentration processing unit Q1 to a steel concentration. 2 Concentration processing unit Q2 and a drying treatment unit Q3 that further concentrates the object to be processed A concentrated in the second concentration processing unit Q2 to bring it into a dry state.

(1st Concentration Processing Unit Q1)
The first concentration processing unit Q1 includes an evaporator 3, a heat exchanger 5 (external heat exchanger) provided outside the evaporator 3, a circulation pump 7, and a first compression means 9. .. The object A to be processed is housed in the evaporator 3. An outlet 3b for extracting the object A to be processed from below the liquid surface to the outside is provided near the bottom of the evaporator 3. The outlet 3b is located slightly higher than the bottom of the evaporator 3. A return port 3a for returning the object to be processed A extracted to the outside at a position above the liquid level is provided on the upper part of the evaporator 3. Further, a steam outlet 3c for extracting the steam in the evaporator 3 to the outside is provided on the upper portion of the evaporator 3.

The outlet 3b of the evaporator 3 is connected to the inlet of the circulation pump 7 via the line L1. The outlet of the circulation pump 7 is connected to the inlet of the heat exchanger 5 via the line L2. The outlet of the heat exchanger 5 is connected to the return port 3a of the evaporator 3 via the line L3. The steam outlet 3c of the evaporator 3 is connected to the inlet of the first compression means 9 via the line L4 and the line L5. The outlet of the first compression means 9 is connected to the inlet of the heating medium of the heat exchanger 5 via the line L6. The heating medium outlet of the heat exchanger 5 is connected to the line L8 via the line L7. For example, a switching valve V4 is provided at a branch point for branching the line L4 into the line L5 and the line L20 described later, and the line L4 can be selectively communicated with the line L5 or the line L20.

Further, the object A to be processed in the evaporator 3 is extracted to the outside from the outlet 3b by the drive of the circulation pump 7, and is introduced into the heat exchanger 5 through the lines L1 and L2. After that, in the heat exchanger 5, the object A to be processed is heated by heat exchange between the object A to be processed and the high-temperature heating medium. The object A to be processed heated by the heat exchanger 5 is returned to the evaporator 3 again through the line L3. As described above, in the first concentration processing unit Q1, the circulation path 11 of the object A to be processed is formed by the evaporator 3, the line L1, the circulation pump 7, the line L2, the heat exchanger 5, and the line L3. Then, in the circulation path 11, the object to be processed A is pumped by the circulation pump 7 provided on the circulation path 11, so that the circulation flow of the object to be processed A as described above is generated. The circulation pump 7 may control the flow rate of the object to be processed A by inverter control or unit number control.

As described above, the object A to be processed is heated by orbiting the circulation path 11, and the temperature of the object A to be processed rises. Due to the temperature rise of the object A to be processed, the solvent component of the object A to be processed evaporates in the evaporator 3 to generate vapor of the solvent component. The steam in the evaporator 3 is drawn out through the steam outlet 3c by the drive of the first compression means 9. In this way, the solvent component of the object A to be processed is gradually removed and the object A to be processed is concentrated by repeating the orbit of the circulation path 11 of the object A to be processed.

The steam drawn from the evaporator 3 is introduced into the first compression means 9 through the lines L4 and L5, is boosted and heated by the first compression means 9, and then is introduced into the heating medium of the heat exchanger 5 through the line L6. Introduced in. Here, the first compression means 9 is a device that compresses the fluid sucked from the inlet and discharges it from the outlet, and such a first compression means 9 includes a blower, a compressor, a vacuum pump, and the like. The steam introduced into the heat exchanger 5 is used as a heating medium for heat exchange with the object A to be processed as described above. A part of steam, which is a heating medium, is condensed in the heat exchanger 5, and the condensed liquid and excess steam are discharged from the outlet of the heating medium of the heat exchanger 5. These join the line L8 through the line L7 and are discharged to the outside of the enrichment system 1.

Further, the first concentration processing unit Q1 includes a steam boiler 13 that generates steam and supplies it to the heat exchanger 5 through the lines L9 and L6 when the concentration system 1 is started or the like. The steam generated by the steam boiler 13 may be steam or steam having the same composition as the solvent of the object A to be treated. When the heat energy is introduced from the steam boiler 13, the temperature of the heating medium of the heat exchanger 5 rises, particularly when the concentration system 1 is started, so that the object A to be processed in the circulation path 11 is efficiently heated. As a result, vapor of the solvent component is generated in the evaporator 3, the vapor functions as a heating medium of the heat exchanger 5, and the object A to be processed is heated in the circulation path 11 to start up at an early stage. Further, the introduction of steam from the steam boiler 13 to the heat exchanger 5 is not limited to the start-up of the concentration system 1, and may be executed even when the thermal energy for the above cycle is insufficient for some reason during steady operation. it can.

In the first concentration processing unit Q1 of the concentration system 1, it is preferable to employ a roots blower as the first compression means 9. In general, the roots blower can increase the capacity (power [W]). Therefore, by using the roots blower as the first compression means 9, the amount of heat that can be supplied to the heat exchanger 5 per unit time can be increased. Can be made larger. As a result, the heating efficiency of the object A to be processed by the heat exchanger 5 is increased, and the efficiency of the concentration treatment by the concentration system 1 is improved. When the roots blower is adopted, when the solvent component of the object A to be treated is water, the rated capacity of the roots blower may be set to, for example, 60 to 70 kW, and the operating output may be set to 50 to 60 kW. Further, when the output of the roots blower is 60 kW, the processing capacity of the object to be processed A by the first concentration processing unit Q1 may be 0.8 to 1.0 m ³ / h.

Further, as the heat exchanger 5, it is preferable to adopt a plate type heat exchanger. Since the plate heat exchanger has a structure in which the flow path of the high temperature fluid and the flow path of the low temperature fluid are alternately laminated with the heat transfer plate sandwiched between them, the heat transfer area between the heating medium and the object A to be processed is formed. Can be increased. Further, in the plate heat exchanger, the heat transfer area can be increased relatively freely. Therefore, the heating efficiency of the object A to be processed by the heat exchanger 5 is increased, the processing by the first concentration processing unit Q1 is speeded up, and the efficiency of the concentration processing by the concentration system 1 is improved. When the solvent component of the object A to be treated is water, the plate heat exchanger forming the heat exchanger 5 is formed when the rated capacity of the roots blower is, for example, 60 to 70 kW and the operating output is 50 to 60 kW. The heat transfer area of the above may be, for example, about 40 m ² . Further, even if the solute component of the object to be treated A is deposited in the heat exchanger 5, the plate heat exchanger makes it easy to clean the inside of the flow path due to its structure. From the viewpoint of improving the maintainability of the heat exchanger 5, it is preferable to use a plate heat exchanger.

(2nd Concentration Processing Unit Q2)
The second concentration processing unit Q2 further evaporates the solvent component of the object to be processed A in the evaporator 3 concentrated in the first concentration processing unit Q1 to increase the concentration of the object to be processed A. The second concentration processing unit Q2 includes an evaporator 3, a second compression means 12, and a steam jacket 4 provided around the lower portion of the evaporator. The steam outlet 3c of the evaporator 3 is connected to the inlet of the second compression means 12 via the line L4 and the line L20. The outlet of the second compression means 12 is connected to the inlet of the steam jacket 4 via the line L22.

In the second concentration processing unit Q2, the steam drawn from the evaporator 3 is introduced into the second compression means 12 through the line L4 and the line L20, is boosted and heated by the second compression means 12, and then is passed through the line L22. It is introduced at the entrance of the steam jacket 4. Here, the second compression means 12 is a device that compresses the fluid sucked from the inlet and discharges it from the outlet, and such a second compression means 12 also includes a blower, a compressor, a vacuum pump, and the like. As the second compression means 12, it is preferable to use a swing compressor. In general, a swing compressor can increase the pressure ratio (ratio of outlet pressure to inlet pressure). Therefore, by using the swing compressor as the second compression means 12, the steam jacket 4 can be used. Can supply high temperature steam.

The steam jacket 4 is supplied with steam that has been boosted and heated by the second compression means 12 through the line L22. When the steam supplied from the second compression means 12 is condensed in the steam jacket 4, the heat of condensation of the steam is applied to the evaporator 3 to heat the evaporator 3. The condensate generated by the condensation of steam in the steam jacket 4 is extracted from the bottom of the steam jacket 4 and discharged to the outside of the concentration system 1 through the line L8. The steam from the steam boiler 13 may also be supplied to the steam jacket 4 through the lines L23 and L22. Since the steam from the steam boiler 13 is also supplied to the steam jacket 4, the object A to be processed can be efficiently heated, especially when the concentration system 1 is started. By the above operation, the object A to be processed in the evaporator 3 is heated, the solvent component is removed from the object A to be processed, and the concentration of the object A to be processed proceeds.

(Drying processing unit Q3)
The drying treatment unit Q3 further evaporates the solvent component of the object to be processed A in the evaporator 3 concentrated in the second concentration processing unit Q2 to increase the concentration of the object to be processed A. The drying processing unit Q3 has a bypass line 30 that can be opened and closed provided on the line L20. The bypass line 30 includes a condenser 31 (condensing unit) that cools and condenses steam passing through the bypass line 30, and a cooling tower 32. Further, a cooling water pipe 31a is provided inside the condenser 31. Cooling water supplied from the cooling tower 32 is circulated in the cooling water pipe 31a. The line L31 branched from the line L20 is connected to the inlet of the condenser 31, and the line L32 connected to the outlet of the condenser 31 joins the line L20. That is, the bypass line 30 is formed by the line L31, the condenser 31, and the line L32.

Of the line L20, the portion from the switching valve V4 to the branch portion of the line L31 is designated as the line L20a, the portion from the branch portion of the line L31 to the confluence portion of the line L32 is referred to as the line L20c, and the second compression is performed from the confluence portion of the line L32. The portion up to the entrance of the means 12 is defined as the line L20b. For example, the bypass line 30 can be opened and closed by providing a switching valve V20 at a branch point between the line L20c and the line L31 and switching the switching valve V20. When the bypass line 30 is opened, the steam from the evaporator 3 to the second compression means 12 passes in the order of line L4, line L20a, line L31, condenser 31, line L32, and line L20b. When the bypass line 30 is closed, the steam from the evaporator 3 to the second compression means 12 passes in the order of line L4, line L20a, line L20c, and line L20b.

The drying processing unit Q3 functions in a state where the bypass line 30 is open. That is, when the steam jacket 4, the second compression means 12, and the cooling tower 32 are driven in the state where the bypass line 30 is open, the object A to be processed in the evaporator 3 is heated by the steam jacket 4. At the same time, the pressure is reduced by the second compression means 12. The heating and depressurization of the object A to be processed promotes the evaporation of the solvent component of the object A to be processed. The vapor of the solvent component evaporated from the object A to be processed in the evaporator 3 is transferred to the second compression means 12 by a moving path composed of the line L4, the line L20a, the line L31, the condenser 31, the line L32, and the line L20b. Move towards.

At this time, in the condenser 31 on the movement path, the vapor of the solvent component comes into contact with the cooling water pipe 31a and is cooled. By this cooling, the vapor is condensed, and the solvent component which has become a liquid is stored in the condenser 31. The solvent component of the liquid stored in the condenser 31 is discharged from the bottom of the condenser 31 to the outside of the concentrating system 1. By the above operation, the solvent component is removed from the object A to be processed in the evaporator 3, and the concentration of the object A to be processed proceeds.

The switching valve V4 may have an adjustable opening degree as well as two-stage switching between an open state and a closed state. Thereby, it is possible to control the amount of steam sent to the line L5 and the amount of steam sent to the line L20. Also. Similarly, the switching valve V20 may be adjustable in opening degree as well as switching in two stages of the open state and the closed state. Thereby, it is possible to control the amount of steam sent to the line L31 and the amount of steam sent to the line L20c.

(Agitator)
In order to make the concentration of the object to be processed A by the second concentration processing unit Q2 and the drying processing unit Q3 more efficient, a stirring device for stirring the object to be processed A in the evaporator 3 is provided in the evaporator 3. You may. FIG. 2 is a cross-sectional view showing an example of the evaporator 3 including the stirring device 20. The evaporator 3 of this example has a cylindrical shape extending in a direction orthogonal to the paper surface of FIG. Inside the evaporator 3, a stirring device 20 that rotates around the cylindrical axis C of the evaporator 3 is provided. The stirring device 20 has a shaft 21 extending on the cylindrical axis C, and a partition plate 23 attached to the shaft 21 in a posture orthogonal to the shaft 21 and forming a substantially octagonal shape.

A plurality of partition plates 23 are arranged at predetermined intervals in the direction orthogonal to the paper surface of FIG. 2, and the internal space of the evaporator 3 is partitioned into a plurality of spaces in the direction of the cylindrical axis C. The partition plate 23 rotates together with the shaft 21. Further, the stirring device 20 has a plurality of heat transfer tubes 25 (heating portions) penetrating each partition plate 23 and extending in the direction of the cylindrical axis C. The heat transfer tube 25 is installed near the peripheral edge of each partition plate 23, and high-temperature steam supplied from the steam boiler 13 flows through the hollow portion of the heat transfer tube 25. The steam supplied from the steam boiler 13 to the heat transfer tube 25 and passing through the heat transfer tube 25 may be subsequently introduced into the steam jacket 4 or merged with the line L8, and the concentration system 1 may be used. It may be discharged to the outside of the system. Further, the stirring device 20 has a stirring blade 27 that rotates together with the shaft 21. The stirring blade 27 rotates together with the shaft 21 while sliding on the inner wall surface of the evaporator 3.

When the shaft 21 is rotated by a predetermined power source, the partition plate 23, the heat transfer tube 25, and the stirring blade 27 described above rotate integrally in the evaporator 3. The object A to be processed contained in the evaporator 3 is heated by the steam jacket 4 and the heat transfer tube 25 while being agitated by the heat transfer tube 25 and the stirring blade 27 above the liquid surface. It will be concentrated efficiently. When the concentration of the object A to be processed becomes high, the object A to be processed may adhere to the inner wall surface of the evaporator 3 due to its viscosity, but the adhered object A to be processed is more efficient by the steam jacket 4 via the inner wall surface. It is heated well. Further, the object A to be processed adhering to the inner wall surface of the evaporator 3 is scraped off by the stirring blade 27. Further, when the object A to be processed is solidified to some extent, the object A to be processed is efficiently heated by entering the gap between the inner wall surface and the heat transfer tube 25 and being rubbed. When the object A to be processed is concentrated to a predetermined concentration in the evaporator 3, the object A to be concentrated is recovered from the evaporator 3 as the final concentrated product.

In this way, in addition to heating and depressurizing the object A to be processed in the evaporator 3, the object A to be processed is efficiently concentrated by stirring with the stirring device 20. Further, in the treatment by the drying treatment unit Q3, almost all the solvent components in the object A to be processed can be removed and the object A to be processed can be concentrated until it becomes a dry state. It can also be concentrated (dried) until it is finally powdered. In the stirring device 20, the heat transfer tube 25 may be omitted.

(Method of concentrating the object to be processed A by the concentration system 1)
Subsequently, a method of concentrating the object to be processed A by the concentrating system 1 will be described with reference to FIG. The concentration method of the present embodiment includes a first-stage concentration step, a second-stage concentration step, and a drying step. In the first concentration step of the present embodiment, at least the first concentration step of concentrating the object A to be processed while circulating it in the circulation path 11 is executed. In the latter stage of concentration of the present embodiment, after the first stage of concentration, a second concentration step of concentrating the object A in the evaporator 3 while heating with the steam jacket 4 in a state where the first concentration step is stopped is performed. Will be executed. In the first concentration step, the first concentration step and the second concentration step may be executed in parallel.

In the first concentration step, the object A to be processed in the evaporator 3 is concentrated by the first concentration processing unit Q1 to a concentration lower than the concentration at which the solute component of the object A is precipitated. That is, the first concentration step is executed when the solute component of the object to be treated A is not precipitated and is completely dissolved in the solvent component. In the second concentration step, the object to be treated A concentrated in the first concentration step is further concentrated by the second concentration processing unit Q2. That is, in the second concentration step, the concentration is further continued even after the solute component of the object A to be treated is precipitated. In the drying step, after the second concentration step, the object to be treated A is further concentrated by the drying treatment unit Q3, and almost all of the solvent components are removed to bring the product into a dry state.

(Startup, start-up)
At the start of the early concentration step, it is necessary to raise the temperature of the entire concentration system 1 to around 100 ° C. Therefore, at the time of start-up, the evaporator 3 is mainly heated by the second concentration processing unit Q2. At this time, in order to prevent the steam on the outlet side of the second compression means 12 from becoming superheated steam and exceeding the heat resistant temperature of the second compression means 12, the second compression means 12 is operated at a low frequency by inverter control. It is preferable to raise the temperature of the concentration system 1 while adjusting the discharge temperature. Further, for example, the steam from the steam boiler 13 may also be sent to the steam jacket 4. When the inside of the evaporator 3 reaches a certain temperature, the steam supply to the steam jacket 4 may be stopped.

(Pre-concentration process)
After the above-mentioned start-up and start-up, the first concentration step is mainly executed in the early concentration step. The first concentration step executed by the first concentration processing unit Q1 includes a compression step of drawing out and compressing the vapor of the solvent component in the evaporator 3 in which the object A to be processed is housed by the first compression means 9, and compression. In the step of introducing the steam compressed in the step into the heat exchanger 5 as a heating medium, and after extracting the object A in the evaporator 3 to the outside and exchanging heat with the heating medium in the heat exchanger 5, the evaporator is again. A step of circulating the circulation path 11 so as to return the product within 3 is provided.

The specific first concentration step is as follows. In the first concentration step, the line L4 is communicated with the line L5 by the switching valve V4. The object to be processed A is housed in the evaporator 3, and the object to be processed A is pumped by the circulation pump 7 and circulates in the circulation path 11. That is, the object A to be processed is extracted to the outside of the evaporator 3 through the lines L1 and L2 and sent to the heat exchanger 5. The object A to be processed is heated by exchanging heat with the heating medium in the heat exchanger 5, and then returned to the evaporator 3 through the line L3. When the solvent component of the object A to be treated is water, the temperature of the object A to be processed in the evaporator 3 during the first concentration step is approximately 100 ° C.

The object A to be processed is heated by passing through the heat exchanger 5 in the circulation of the circulation path 11, the solvent component of the heated object A to be processed evaporates, and vapor of the solvent component is generated in the evaporator 3. .. This steam is drawn to the outside of the evaporator 3 through the lines L4 and L5 by the first compression means 9 and compressed. The compressed steam is introduced into the heat exchanger 5 through the line L6 and functions as the above-mentioned heating medium. A part of the steam as the heating medium is condensed in the heat exchanger 5, and the condensate and the excess steam are discharged to the outside of the concentrating system 1 through the lines L7 and L8. As described above, in the first concentration step, the solvent component of the object A to be processed is gradually removed, and the object A to be processed is concentrated.

As described above, in the first concentration step, the first concentration step and the second concentration step described later may be executed in parallel. In this case, the switching valve V4 may allow the line L4 to communicate with both the line L5 and the line L20. If the second concentration step is not executed in the first stage of concentration, high-temperature steam is suddenly introduced into the second compression means 12 when the second stage of concentration is switched to, and the clearance of the second compression means 12 is increased. It may be lost and damage the second compression means 12. On the other hand, by executing the second concentration step and driving the second compression means 12 also in the first concentration step, the damage of the second compression means 12 as described above can be suppressed.

(Late concentration process)
When the object A to be treated reaches a predetermined concentration in the first concentration step, the circulation pump 7 is stopped and the process shifts from the early concentration step to the late concentration step. In the late concentration step, the first concentration step is stopped and the next second concentration step is executed.

In the second concentration step, the switching valve V4 communicates the line L4 with the line L20, and the switching valve V20 closes the bypass line 30. In the second concentration processing unit Q2, the steam jacket 4 and the second compression means 12 are driven, and the object A to be processed in the evaporator 3 is heated by the steam jacket 4 and depressurized by the second compression means 12. Will be done. Further, the stirring device 20 (see FIG. 2) may be driven to stir the object A to be processed in the evaporator 3. The heating and depressurization of the object A promotes the evaporation of the solvent component of the object A, and the vapor of the solvent component evaporated from the object A in the evaporator 3 is second-compressed through the lines L4 and L20. It is sucked by the means 12 and is boosted and heated by the second compression means. The boosted / heated steam is supplied to the steam jacket 4 through the line L22.

When the steam supplied from the second compression means 12 is condensed in the steam jacket 4, the heat of condensation of the steam is applied to the evaporator 3 to heat the evaporator 3. The condensate generated by the condensation of steam in the steam jacket 4 is extracted from the bottom of the steam jacket 4 and discharged to the outside of the concentration system 1 through the line L8. By heating the evaporator 3 with the steam jacket 4, the object A to be processed in the evaporator 3 is heated, and the solvent component evaporates from the object A to be processed. As described above, in the second concentration step, the solvent component of the object to be treated A is gradually removed, and a part of the solute component of the object to be treated A is precipitated, and the object to be treated is further removed from that state. A is concentrated and the amount of solute component precipitated increases.

(Drying process)
After that, when the object A to be treated reaches a predetermined concentration, the process shifts from the late concentration step to the drying step. In the drying step, the switching valve V4 communicates the line L4 with the line L20, and the switching valve V20 opens the bypass line 30. In the drying step, the steam jacket 4, the second compression means 12, and the cooling tower 32 are driven in the drying processing unit Q3, and the object A to be processed in the evaporator 3 is heated by the steam jacket 4 and the first 2 The pressure is reduced by the compression means 12. Further, the stirring device 20 (see FIG. 2) may be driven to stir the object A to be processed in the evaporator 3.

The heating and depressurization of the object A promotes the evaporation of the solvent component of the object A, and the vapor of the solvent component evaporated from the object A in the evaporator 3 is line L4, line L20a, line L31, It moves toward the second compression means 12 by a movement path composed of the condenser 31, the line L32, and the line L20b. At this time, in the condenser 31 on the movement path, the vapor of the solvent component comes into contact with the cooling water pipe 31a and is cooled. By this cooling, the vapor is condensed, and the solvent component which has become a liquid is stored in the condenser 31. The solvent component of the liquid stored in the condenser 31 is discharged from the bottom of the condenser 31 to the outside of the concentrating system 1. By the above operation, the solvent component is removed from the object A to be processed in the evaporator 3, and the concentration of the object A to be processed proceeds.

In the drying step, the temperature inside the evaporator 3 is set to, for example, 40 to 70 ° C. The temperature inside the evaporator 3 may be controlled by controlling the inverter of the second compression means 12 or the condenser 31. By lowering the temperature inside the evaporator 3 to a relatively low temperature as described above, the object to be processed A strongly adheres to the inner wall surface of the evaporator 3 or the object to be processed A is denatured (for example, carbonized) by the high temperature. Can be suppressed. Further, since the inside of the evaporator 3 is depressurized by the second compression means 12, the solvent component of the object to be treated A is sufficiently evaporated even at the comparatively low constant temperature as described above. In the drying step, for example, almost all the solvent components in the object A to be processed may be removed and the object A to be processed may be concentrated until it becomes dry. For example, the object A to be processed may be finally powdered. It may be concentrated so as to become. In the drying step, most of the steam of the evaporator 3 may be recovered as a condensed liquid in the condenser 31, and the steam reaching the steam jacket 4 may be insufficient. In this case, steam from the steam boiler 13 may be supplied to the steam jacket 4 as a heat energy source through the lines L23 and L22.

(Switching from the early concentration process to the late concentration process)
In the first concentration step by the first concentration processing unit Q1, the object A to be processed is circulated in the heat exchanger 5 outside the evaporator 3 and heated. Therefore, it is necessary that the object A to be treated is a liquid and the solute component in the object A to be treated is completely dissolved. Further, if the concentration of the object A to be processed is too high, the solute component of the object A to be processed may precipitate in the circulation path 11 (for example, in the flow path of the heat exchanger 5), which may block the path. Therefore, in the first concentration step by the first concentration processing unit Q1, it is necessary to monitor the concentration of the object A to be processed and stop when the object A to be processed reaches the specified concentration. Then, at least, the above-mentioned defined concentration needs to be lower than the concentration at which the solute component of the object A to be treated is precipitated. The above-specified concentration is set in advance in consideration of the safety factor. In the concentration system 1, the first concentration step by the first concentration processing unit Q1 is executed as the first concentration process until the concentration of the object A to be treated reaches the specified concentration, and then the first concentration step is stopped. It is decided to shift to the late concentration process.

Therefore, the concentration method of the present embodiment includes a concentration detection step that is executed in parallel with the first concentration step to detect the concentration of the object A to be processed, and the detected concentration is the specified concentration. When the above is reached, the first concentration step is stopped and the early concentration step is switched to the late concentration step. As a means for detecting the concentration of the object A to be processed, a hydrometer may be provided on the circulation path 11 to detect the specific gravity which is an index of the concentration of the object A to be processed. In this case, when the specific gravity exceeds a predetermined value, the circulation pump 7 is stopped and the first concentration step is stopped. Further, for example, the amount of raw water of the object A to be treated introduced into the evaporator 3 and the amount of the condensate recovered from the line L8 are measured, and the concentration of the object A to be processed is detected based on these amounts. You may.

By adjusting the opening degree of the switching valve V4 and controlling the amount of steam sent to the line L5 and the amount of steam sent to the line L20, the second concentration step or the drying step is performed in parallel with the first concentration step. May be executed. Further, the opening degree of the switching valve V20 is adjusted, and the amount of steam sent to the line L31 and the amount of steam sent to the line L20c are controlled, so that the second concentration step and the drying step are executed in parallel. May be good.

(Sampling mechanism)
Further, from the viewpoint of preventing the precipitation of the solute component in the circulation path 11, it is not preferable that the object A to be treated remains in the flow path of the circulation path 11 after the first concentration step is stopped. That is, when the temperature of the object to be treated A filled in each pipeline of the circulation path 11 decreases, it is conceivable that the solubility of the solute component decreases and precipitates in the pipeline. Therefore, an extraction mechanism for extracting the object to be processed A from the circulation path 11 is provided on the circulation path 11. Specifically, a bypass that bypasses the circulation pump 7 and connects the line L1 and the line L2 is provided, and an on-off valve V1 is provided on the bypass. Further, an on-off valve V2 is provided on the line L1.

During the execution of the first concentration step by the first concentration processing unit Q1, the circulation pump 7 is driven, the on-off valve V1 is closed, and the on-off valve V2 is open. After that, when the first concentration step is stopped, the circulation pump 7 is stopped and the on-off valve V1 and the on-off valve V2 are opened so that the object A in the circulation path 11 is directed to the outlet 3b through the bypass. And flow backwards. Here, if the position of the inlet of the heat exchanger 5 is higher than the liquid level of the object A to be processed in the evaporator 3, at least the object A to be processed in the heat exchanger 5 is discharged by its own weight. Further, when the liquid level of the object A to be processed becomes lower than the outlet 3b during the second concentration step, the object A to be processed in the circulation path 11 returns to the evaporator 3.

After that, by closing the on-off valve V2, the object A to be processed in the evaporator 3 does not move to the circulation path 11. The on-off valve V2 may be left open. Alternatively, the on-off valve V2 on the line L1 may be omitted. In this case, as the liquid level of the object to be processed A drops during the second concentration step, the object to be processed A remaining in the circulation path 11 flows back into the evaporator 3. The extraction mechanism having the above function is not limited to the above configuration, and can be appropriately constructed by using general-purpose elements such as an on-off valve and a switching valve. Further, instead of the method of providing the bypass as described above, a forward / reverse pump is adopted for the circulation pump 7, and the object A in the circulation path 11 is caused to flow back to the evaporator 3 by the reverse rotation of the circulation pump 7 and discharged. You may.

In the above concentration system 1, the lines L1 to L32 and the like, and the lines and the like in the second to fourth embodiments described later, are formed of, for example, a pipe body in order to convey the objects to be conveyed such as gas and liquid. It is a transport path to be carried. In each line, the specifications of the pipe body (for example, material, wall thickness, heat insulating characteristics, cross-sectional area of the inner space, etc.) may be determined according to the purpose. Further, each line is provided with valves such as an on-off valve and a switching valve, and pumps, if necessary. By appropriately controlling the operation of such valves and pumps, it is possible to control to which line the object to be conveyed is advanced at the branch portion of the line or the like. Further, sensors (thermometer, flow meter, pressure gauge, etc.) are provided in each line and equipment such as the evaporator 3 and the heat exchanger 5 as needed. In order to realize each of the above-mentioned functions of the enrichment system 1, the above-mentioned valves, pumps, sensors and the like provided in each part may be appropriately operated.

Subsequently, the action and effect of the concentration system 1 and the concentration method will be described.

The concentration system 1 further concentrates the first concentration processing unit Q1 that concentrates the object A to a predetermined concentration, the second concentration processing unit Q2 that further concentrates the object A to be processed, and the concentration degree of the object A to be processed. It is provided with a drying processing unit Q3 for enhancing. In the first concentration processing unit Q1, the object A to be processed in the evaporator 3 is extracted to the outside, heat exchanged with the heating medium by the heat exchanger 5, and then circulated so as to be returned to the evaporator 3 again. Is provided. The heat exchanger 5 exchanges heat between the object A to be processed and the heating medium extracted to the outside of the evaporator 3. Therefore, since the heat exchanger 5 is provided outside the evaporator 3, there is little restriction on increasing the heat transfer area between the object A to be processed and the heating medium, and as a result, the heat transfer area is increased. The heating efficiency of the object A to be treated can be improved, and the efficiency of the concentration treatment of the entire concentration system 1 can be increased. Then, by increasing the energy efficiency of the concentration treatment, the heat energy to be supplied from the steam boilers 13, 14 and the like can be reduced, and energy saving can be achieved.

Further, in the concentration method by the concentration system 1, the concentration of the object to be treated A is detected in the first concentration step, and the first concentration step is mainly performed up to the stage of concentration lower than the concentration at which the solute component of the object to be treated is precipitated. Is executed (early concentration step), after that, the first concentration step is stopped and only the second concentration step is executed (late concentration step). According to this concentration method, the possibility that the solute component of the object to be treated A is precipitated in the circulation path 11 of the first concentration processing unit Q1 of the concentration system 1 is suppressed, and the first concentration step can be smoothly performed. After that, at the stage where precipitation of the solute component can occur, the object A to be processed is concentrated in the evaporator 3 by the second concentration processing unit Q2. That is, at the stage where the concentration of the object A to be processed is relatively low, the possibility of precipitation of solute components is low, so that the object A to be processed can be heated with high efficiency while circulating through the circulation path 11, and the object to be processed A can be heated with high efficiency. When the concentration of the substance A becomes relatively high, the substance A to be treated can be further concentrated while precipitating the solute component in the evaporator 3. Further, the drying treatment unit Q3 can bring the object A to be treated into a dry state in which almost all the solvent components have been removed.

[Second Embodiment]
Subsequently, the concentration system 201 according to the second embodiment will be described with reference to FIG. The concentration system 201 as described below also has the same effects as the concentration system 1 of the first embodiment. In the present embodiment, the same or equivalent components as those in the above-described embodiment are designated by the same reference numerals in the drawings, and duplicate description will be omitted. Further, regarding the concentration method executed by the concentration system 201 of the present embodiment, only the points different from those of the above-described embodiment will be described, and duplicate description will be omitted.

The concentration system 201 includes a drying processing unit Q23 in place of the drying processing unit Q3 of the concentration system 1 described above. The drying processing unit Q23 includes a condenser 41, a condensate tank 42 located below the condenser 41, and a decompression means 43. The inlet of the condenser 41 is connected to the steam outlet 3c of the evaporator 3 through the lines L4 and L41. The outlet of the condenser 41 is communicated with the upper space of the condensate tank 42 through the line L42. Further, the upper space of the condensate tank 42 is communicated with the inlet of the decompression means 43 through the line L45.

Cooling water is supplied to the condenser 41 through the line L43, and the used cooling water is discharged from the condenser 41 through the line L44. The condenser 41 cools the steam introduced from the line L41 to the inlet with cooling water to condense the steam, and discharges the condensed liquid from the outlet to the line L42. The condensate discharged from the line L42 is stored in the condensate tank 42 below. The condensate generated in the condenser 41 is stored in the lower space of the condensate tank 42, and the above-mentioned lines L42 and L45 are both connected to the upper space above the liquid level of the condensate. ..

The depressurizing means 43 is a device that compresses the fluid sucked from the inlet and discharges it from the outlet, and such depressurizing means 43 includes a blower, a compressor, a vacuum pump, and the like. In this embodiment, it is assumed that a vacuum pump is adopted as the depressurizing means 43. The depressurizing means 43 decompresses the inside of the evaporator 3 through the line L45, the upper space of the condensate tank 42, the line L42, the condenser 41, the line L41, and the line L4.

In the drying step, the vapor introduced into the condenser 41 through the line L41 is cooled and condensed by the condenser 41 and stored in the condensate tank 42 as a condensate, and is stored in the condensate tank 42 from the bottom of the condensate tank 42 through the line L47. It is discharged to the outside of the concentration system 201.

[Third Embodiment]
Subsequently, the concentration system 301 according to the third embodiment will be described with reference to FIG. The concentration system 301 as described below also has the same effects as the concentration system 1 of the first embodiment. In the present embodiment, the same or equivalent components as those in the above-described embodiment are designated by the same reference numerals in the drawings, and duplicate description will be omitted. Further, regarding the concentration method executed by the concentration system 301 of the present embodiment, only the points different from those of the above-described embodiment will be described, and duplicate description will be omitted.

The enrichment system 301 is different from the enrichment system 201 in that the first compression means 9 and the second compression means 12 in the above-mentioned enrichment system 201 are shared by one common compression means. This common compression means will be referred to as "common compression means 14" below. Here, the common compression means 14 is a device that compresses the fluid sucked from the inlet and discharges it from the outlet, and such a common compression means 14 also includes a blower, a compressor, a vacuum pump, and the like. As the common compression means 14, it is preferable to use a swing compressor. In this way, by consolidating the functions of the first compression means 9 and the second compression means 12 into one common compression means 14, the system can be simplified.

In the concentration system 301, a line L32 from the discharge port of the common compression means 14 to the heat exchanger 5 and a line L37 from the discharge port of the common compression means 14 to the jacket portion are branched and provided, that is, The line L31 drawn from the outlet of the common compression means 14 is branched into a line L32 and a line L37, and the line L32 is connected to the inlet of the heat exchanger 5. The outlet of the heat exchanger 5 joins the line L37 through the line L33. The line L34 formed by merging the line L33 and the line L37 is branched into a line L36 for supplying steam to the steam jacket 4 and a line L35 merging with the line L8. The steam from the steam boiler 13 can be supplied to both the line L32 and the line L37 through the line L9. By providing the on-off valve V32 on the line L32 and providing the on-off valve V37 on the line L37, it is possible to selectively switch whether the line L31 is communicated with the line L32 or the line L37.

In the first concentration step in the concentration system 301, the steam in the evaporator 3 is sucked into the common compression means 14 through the line L30, boosted and heated by the common compression means 14, and heat exchangers through the lines L31 and L32. It is supplied to No. 5 as a heating medium. After that, the vapor and the condensate discharged from the heat exchanger 5 are discharged to the outside of the concentrating system 301 through the line L33, the line L34, the line L35, and the line L8.

Further, in the first concentration step, a thermometer T1 for measuring the temperature of the object to be processed A is provided on the line L3, and a thermometer T2 for measuring the steam temperature is provided on the line L32, and the thermometer T1 and the thermometer T2 are measured. The circulation flow rate of the object A to be processed may be controlled by the circulation pump 7 so as to reduce the temperature difference. Further, a thermometer T3 for measuring the temperature of the object to be processed A is provided on the line L2, and a thermometer T4 for measuring the steam temperature is provided on the line L34 so that the difference between the measured temperatures of the thermometer T3 and the thermometer T4 is reduced. In addition, the circulation flow rate of the object A to be processed by the circulation pump 7 may be controlled. By these controls, it is possible to optimize the power of the circulation pump 7 and save energy.

In the second concentration step in the concentration system 301, the steam in the evaporator 3 is sucked into the common compression means 14 through the line L30, is boosted and heated by the common compression means 14, and is line L31, line L37, line L34, And is supplied to the steam jacket 4 as a heating medium through the line 36.

Further, the concentration system 301 includes a drying processing unit Q33 instead of the drying processing unit Q23 of the concentration system 201. The drying treatment unit Q33 uses the decompression action of the common compression means 14 instead of the decompression means 43 of the drying treatment unit Q23. The drying processing unit Q33 has a bypass line 40 that can be opened and closed, which is a bypass of the line L30. The bypass line 40 is formed of a line L41, a condenser 41, a line L42, a condensate tank 42, and a line L45. There is. For example, the bypass line 40 can be opened and closed by a switching valve V30 or the like provided at the branch portion of the line L41. When the bypass line 40 is opened, the steam from the evaporator 3 passes through the line L30a, the bypass line 40, and the line L30b toward the common compression means 14. When the bypass line 40 is closed, the steam from the evaporator 3 passes through the lines L30a, L30c, and L30b toward the common compression means 14.

In the drying processing section Q33, the line L41 branches off from the line L30, and the line L45 joins the line L30 again. A line L56 released to the outside is branched from the line L31. Here, in the line L30, the portion from the steam outlet 3c to the branch portion of the line L41 is referred to as the line L30a, the portion from the branch portion of the line L41 to the confluence portion of the line L45 is referred to as the line L30c, and from the confluence portion of the line L45. The portion up to the inlet of the common compression means 14 is defined as the line L30b.

In the drying step in the concentration system 301, the line L30a is communicated with the line L41, the line L30b is communicated with the line L45, and the line L30c is closed. In this state, the evaporator 3 is depressurized by the common compression means 14 through the line L30a, the line L41, the condenser 41, the line L42, the upper space of the condensate tank 42, the line L45, and the line L30b. The exhaust gas due to the reduced pressure of the common compression means 14 is discharged to the outside of the enrichment system 301 through the lines L31 and L56.

[Fourth Embodiment]
Subsequently, the concentration system 401 according to the fourth embodiment will be described with reference to FIG. The concentration system 401 as described below also has the same effects as the concentration system 1 of the first embodiment. In the present embodiment, the same or equivalent components as those in the above-described embodiment are designated by the same reference numerals in the drawings, and duplicate description will be omitted. Further, regarding the concentration method executed by the concentration system 401 of the present embodiment, only the points different from those of the above-described embodiment will be described, and duplicate description will be omitted.

The concentration system 401 includes a drying processing unit Q43 instead of the drying processing unit Q33 of the concentration system 301. The drying processing unit Q43 includes a post-stage evaporator 71, a steam jacket 72, a condenser 73, a decompression means 75, and a cooling tower 77. After the completion of the late concentration step, the object A to be processed in the evaporator 3 is transferred to the latter stage evaporator 71 of the drying treatment unit Q43 through the line L60 and accommodated. Then, the drying step is executed in a state where the object A to be processed is housed in the post-stage evaporator 71.

The steam jacket 72 is provided around the lower part of the post-stage evaporator 71, and steam is supplied to the steam jacket 72 from the steam boiler 79 through the line L63. When the steam supplied from the steam boiler 79 condenses in the steam jacket 72, the heat of condensation of the steam is applied to the post-stage evaporator 71 to heat the post-stage evaporator 71. The condensate generated by the condensation of steam in the steam jacket 72 is extracted from the bottom of the steam jacket 72, returned to the steam boiler 79 through the line L64, and reused as a steam source.

The post-stage evaporator 71 and the condenser 73 are communicated with each other via the line L61. The line L61 connects the upper part of the post-stage evaporator 71 and the upper part of the condenser 73. Further, a decompression means 75 is connected to the upper part of the condenser 73 via a line L62. The depressurizing means 75 can evacuate the condenser 73 and the post-stage evaporator 71 communicated with the condenser 73 to reduce the pressure. Here, the decompression means 75 is a device that compresses the fluid sucked from the inlet and discharges it from the outlet, and the decompression means 75 also includes a blower, a compressor, a vacuum pump, and the like. In this embodiment, it is assumed that a vacuum pump is adopted as the decompression means 75. Further, a cooling water pipe 73a is provided inside the condenser 73. Cooling water supplied from the cooling tower 77 flows through the cooling water pipe 73a.

When the steam jacket 72, the depressurizing means 75, and the cooling tower 77 are driven in the drying processing unit Q43 having the above configuration, the object A to be processed in the subsequent evaporator 71 is heated by the steam jacket 72 and the decompressing means. The pressure is reduced by 75. The heating and depressurization of the object A to be processed promotes the evaporation of the solvent component of the object A to be processed. The vapor of the solvent component evaporated from the object A to be processed in the subsequent evaporator 71 moves toward the decompression means 75 in the movement path composed of the line L61, the condenser 73 and the line L62. At this time, in the condenser 73 on the movement path, the vapor of the solvent component comes into contact with the cooling water pipe 73a and is cooled. The cooling causes the vapor to condense, and the liquid solvent component is stored in the condenser 73. The solvent component of the liquid stored in the condenser 73 is discharged from the bottom of the condenser 73 to the outside of the system of the concentration system 1 and recovered. By the above operation, the solvent component is removed from the object A to be processed in the subsequent evaporator 71, and the concentration of the object A to be processed proceeds.

The stirring device 20 (see FIG. 2) as described above may be provided in the post-stage evaporator 71. In this case, in the drying step, the object A to be processed is heated while being stirred in the subsequent evaporator 71, and the solvent component is efficiently evaporated from the object A to be processed. Therefore, in the drying step, for example, almost all the solvent components in the object A to be processed can be removed and the object A to be processed can be concentrated until it becomes a dry state. For example, the object A to be processed is finally in the form of powder. Can be concentrated to

The present invention can be carried out in various forms having various modifications and improvements based on the knowledge of those skilled in the art, including the above-described embodiment. It is also possible to construct a modified example of the embodiment by utilizing the technical matters described in the above-described embodiment. The configurations of the respective embodiments may be combined and used as appropriate. For example, in the embodiment, an example in which a roots blower is adopted as the first compression means 9 is described, but the present invention is not limited to this, and various compression means can be adopted. Further, an example in which a swing compressor is adopted as the second compression means 12 has been described, but the present invention is not limited to this, and various compression means can be adopted. Further, although an example in which a vacuum pump is adopted as the decompression means 43 and 75 is described, the present invention is not limited to this, and various decompression means can be adopted. That is, the first compression means 9, the second compression means 12, the common compression means 14, and the decompression means 43, 75 include various compression means including, for example, a roots blower, a swing type compressor, a turbo type compressor, and the like. , The depressurizing means can be appropriately adopted. Further, in the embodiment, an example in which a plate type heat exchanger is adopted as the heat exchanger 5 is described, but the present invention is not limited to this, and various heat exchangers can be adopted.

1, 201, 301, 401 ... Concentration system, 3 ... Evaporator, 4 ... Steam jacket (jacket), 5 ... Heat exchanger (external heat exchanger), 9 ... First compression means, 12 ... Second compression means , 11 ... Circulation path, 14 ... Common compression means, 15 ... Condenser (condensing part), 30, 40 ... Bypass line, 31, 41 ... Condenser (condensing part) A ... Work object, L32, L37 ... Line ( Steam flow path), Q1 ... 1st concentration processing unit, Q2 ... 2nd concentration processing unit.

Claims (8)

A concentration system that concentrates the object to be treated by evaporating the solvent component of the object to be treated, which is a liquid.
The evaporator in which the object to be processed is housed and
A first concentration processing unit capable of concentrating the object to be processed in the evaporator to a predetermined concentration, and
A second concentration treatment unit capable of concentrating the object to be treated to a concentration higher than the predetermined concentration is provided.
The first concentration processing unit
A first compression means for drawing out and compressing the vapor of the solvent component in the evaporator to the outside,
An external heat exchanger provided outside the evaporator and in which the steam compressed by the first compression means is introduced as a heating medium.
It has a circulation path in which the object to be processed in the evaporator is extracted to the outside, heat exchanged with the heating medium by the external heat exchanger, and then circulated so as to be returned to the evaporator again.
The second concentration processing unit
A second compression means for drawing and compressing the steam in the evaporator to the outside,
A concentration system having a jacket portion provided around the evaporator and compressed by the second compression means, and a jacket portion for condensing the steam and applying heat of condensation to the evaporator. A bypass line that can be opened and closed is provided in the flow path that conveys the steam from the evaporator to the second compression means.
The bypass line
The concentration system according to claim 1, further comprising a condensing portion that cools and condenses the passing steam. The first compression means has a roots blower and has
The concentration system according to claim 1 or 2, wherein the second compression means has a swing compressor. The first compression means and the second compression means are standardized by one common compression means.
Claims 1 to 1, wherein a steam flow path from the discharge port of the common compression means to the external heat exchanger and a steam flow path from the discharge port of the common compression means to the jacket portion are branched and provided. The concentration system according to any one of 3. A bypass line that can be opened and closed is provided in the flow path that conveys the steam from the evaporator to the common compression means.
The bypass line
The concentration system according to claim 4, further comprising a condensing portion that cools and condenses the passing steam. The concentration system according to claim 4 or 5, wherein the common compression means has a swing compressor. A concentration method for concentrating the object to be treated by evaporating the solvent component of the object to be treated which is a liquid.
A first-stage concentration step in which at least the first concentration step for concentrating the object to be treated is executed, and a second-stage concentration step in which the second concentration step is executed with the first concentration step stopped after the first-stage concentration step. And, the object to be treated is concentrated through
The first concentration step is
A first compression step in which the vapor of the solvent component in the evaporator in which the object to be processed is housed is drawn out and compressed.
A step of introducing the steam compressed in the first compression step into an external heat exchanger provided outside the evaporator as a heating medium, and a step of introducing the steam into an external heat exchanger provided outside the evaporator.
It has a step of extracting the object to be processed in the evaporator to the outside, exchanging heat with the heating medium by the external heat exchanger, and then circulating the circulation path so as to return the object to the evaporator again. ,
The second concentration step is
A second compression step of drawing out and compressing the steam in the evaporator to the outside, and
A concentration method comprising a step of introducing the steam compressed in the second compression step into a jacket portion provided around the evaporator, condensing the steam, and applying heat of condensation to the evaporator. A concentration detection step, which is executed in parallel with the first concentration step and detects the concentration of the object to be processed, is further provided.
The seventh aspect of claim 7, wherein when the enrichment detected in the enrichment detection step reaches a predetermined enrichment, the first concentration step is stopped and the early concentration step is switched to the late concentration step. Concentration method.

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