JP2009090168A - Concentrator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple-construction concentrator which recovers acid from the vapor containing the acid as a valued material. <P>SOLUTION: This concentrator recovers the acid by concentrating the vapor containing the acid and is equipped with a horizontal pipe-type evaporator 51 including an evaporation can 11 for storing a treated liquid 60 and a heat transfer device 14 for thermally evaporating the treated liquid 60. The horizontal pipe-type evaporator 51 introduces the vapor containing the acid as a heating medium into the heat transfer device 14 and guides a condensate of the vapor generated by heat exchange with the treated liquid 60 into the evaporation can 11 as the treated liquid 60. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a concentrator. In particular, the present invention relates to a concentrating device for recovering acid from vapor containing acid.

  Steam containing acid, which is a valuable material, may be discharged from facilities that produce acid. For example, there is a case where steam containing nitric acid is discharged from a facility for producing nitric acid. In the nitric acid production facility, the produced nitric acid is recovered in an absorption tower. At this time, steam containing nitric acid is discharged as waste vapor. Thus, nitric acid is contained in the exhaust from the nitric acid production facility.

  In the prior art, steam containing nitric acid discharged from a nitric acid production facility is condensed by contacting with seawater or water using a barometric trick condenser. Next, it neutralizes with alkaline solutions, such as caustic soda. This was followed by dilution and release.

Japanese Patent Application Laid-Open No. 1-275414 discloses a NOx recovery device that recovers a reaction product at the same time as removing nitrogen oxides in the off-gas of a plant. Japanese Patent Application Laid-Open No. 2-26617 discloses a NOx absorber that treats iodine and NOx in off-gas generated when reprocessing spent nuclear power plant fuel.
JP-A-1-275414 JP-A-2-26617

  In some cases, exhaust and wastewater discharged from factories and the like contain pollutants that cause pollution. In closed water areas such as Tokyo Bay, Ise Bay, and the Seto Inland Sea, total volume regulations are in place to improve water quality in order to prevent pollution.

  In the total amount regulation, the total amount of a specific substance discharged to a predetermined area is regulated rather than regulating the concentration of pollutants in exhaust or waste water. As specific substances, for example, nitrogen or phosphorus is subject to regulation. Regarding nitrogen to be regulated, nitrates are also regulated in addition to nitric acid as a substance containing nitrogen.

  In the nitric acid production facility, most of the produced nitric acid is recovered by the absorption tower, while water vapor containing, for example, about 1 wt% nitric acid is discharged. The steam discharged from the nitric acid production facility is neutralized after condensation. Although it becomes nitrate by neutralization, since this salt contains nitrogen, it is subject to total amount regulation.

  In particular, in closed water areas, it has been required to reduce the amount of nitrogen released by regulating the total amount of nitrogen. Even in areas where there is no total amount control, it was required to reduce the amount of nitrogen released to prevent pollution.

  In the conventional technique, nitric acid contained in the exhaust is discarded after a treatment such as neutralization. As described above, there is a problem that valuable materials that are valuable materials are discarded.

  This invention makes it a subject to provide the concentration apparatus which can simplify the structure of the apparatus which collect | recovers an acid from the vapor | steam containing the acid as a valuable substance.

  The concentrator of the present invention is a concentrator that condenses vapor containing acid and recovers the acid. The concentrating device includes a first evaporator including an evaporator that stores the processing liquid and a heat transfer device that heats and evaporates the processing liquid. The first evaporator is configured to introduce an acid-containing steam as a heating medium into the heat transfer device, and introduce steam condensed water generated by heat exchange with the processing liquid into the evaporator as the processing liquid. Yes.

  Preferably in the said invention, a heat exchanger has a heat exchanger tube arrange | positioned inside the evaporator. A 1st evaporator is arrange | positioned above a heat exchanger tube, and contains the spreader which spreads a process liquid toward a heat exchanger tube.

  Preferably, in the above invention, a second evaporator is provided for further evaporating and concentrating the processing liquid concentrated in the first evaporator. Condensed water formed by condensing the steam generated in the second evaporator is returned to the evaporator of the first evaporator as a processing liquid.

  The acid recovery method of the present invention is a method of recovering acid from vapor containing acid using a first evaporator including an evaporator that stores the processing liquid and a heat exchanger that heats and evaporates the processing liquid. The recovery method includes a step of introducing an acid-containing vapor as a heating medium into the heat exchanger of the first evaporator. The heat exchanger of the first evaporator includes an evaporation step of heat-evaporating the treatment liquid by exchanging heat between the acid-containing vapor and the treatment liquid. A step of introducing the condensed water generated in the heat exchanger of the first evaporator into the evaporator as a treatment liquid.

  Preferably in the said invention, the process of using a 1st evaporator provided with the heat exchanger by which the heat exchanger tube is arrange | positioned inside the evaporator is included. The evaporation step includes a step of spraying the treatment liquid from above the heat transfer tube of the first evaporator toward the heat transfer tube.

  Preferably, the above invention further includes a step of evaporating and concentrating the processing liquid concentrated in the first evaporator in the second evaporator. A step of returning condensed water formed by condensing the steam generated in the second evaporator to the evaporator of the first evaporator as a processing liquid.

  ADVANTAGE OF THE INVENTION According to this invention, the structure of the apparatus which collect | recovers an acid from the vapor | steam containing the acid as a valuable substance can be simplified.

(Embodiment 1)
With reference to FIG. 1, the concentration apparatus and the acid recovery method in Embodiment 1 will be described. The concentration apparatus in the present embodiment is a concentration apparatus that recovers nitric acid from waste vapor discharged from a nitric acid production facility. In the present embodiment, nitric acid is recovered by a method of condensing condensed water of waste vapor. The acid as a valuable substance in the present embodiment is nitric acid. The concentrating device in the present embodiment is a multi-stage concentrating device.

  FIG. 1 is a schematic system diagram of the concentrating device in the present embodiment. The concentrating device in the present embodiment includes a plurality of evaporators. The concentrating device in the present embodiment includes a horizontal tube type evaporator 51 as a first evaporator. The horizontal tube evaporator 51 includes the evaporator 11. The evaporator 11 is formed so that the processing liquid 60 can be stored therein. The evaporator 11 is formed in a cylindrical shape.

  The horizontal tube type evaporator 51 in the present embodiment includes a heat transfer device 14 that heats and evaporates the treatment liquid 60. The heat exchanger 14 is a heat exchanger. The heat transfer device 14 includes a heat transfer tube 14 a disposed inside the evaporator 11. The heat transfer tubes 14a are arranged so as to extend in the horizontal direction. The heat transfer device 14 includes header portions 14b and 14c. The header part 14b is a header part on the side into which steam as a heating medium flows. The header part 14c is a header part on the discharge side where the steam passing through the heat transfer tube 14a condenses and collects as condensed water. In the present embodiment, a plurality of heat transfer tubes 14a are connected to the header portions 14b and 14c.

  Horizontal tube type evaporator 51 in the present embodiment includes a circulation channel. A pipe 70 is disposed in the circulation channel. The horizontal tube evaporator 51 includes a circulation pump 12. The circulation pump 12 is formed so as to send the processing liquid 60 to the spreader 13 through the pipe 70.

  The horizontal tube evaporator 51 in the present embodiment includes a spreader 13. The spreader 13 is connected to the pipe 70. The spreader 13 is disposed inside the evaporator 11. The spreader 13 is disposed above the heat transfer tube 14 a of the heat transfer device 14. The spreader 13 is formed so that the processing liquid 60 can be sprayed toward the heat transfer tube 14a.

  The concentrating device in the present embodiment includes a stock solution tank 55. The stock solution tank 55 is connected to the header portion 14 c of the heat transfer device 14. The concentrating device includes a transfer pump 35. The transfer pump 35 is configured to transfer the condensed water stored in the header portion 14 c to the stock solution tank 55. The concentrator includes a transfer pump 36. The transfer pump 36 is configured to transfer the treatment liquid 60 stored in the stock solution tank 55 to the evaporator 11.

  A pipe 71 is connected to the upper part of the evaporator 11 as an exhaust pipe for discharging steam generated inside the evaporator 11. The pipe 71 is connected to the condenser 41. The condenser 41 is formed so that the cooling water is supplied as indicated by an arrow 101 and the cooling water is discharged as indicated by an arrow 102.

  The condenser 41 is connected to a transfer pump 37 for discharging condensed water generated by cooling the steam. A pipe 72 as a drain pipe is connected to the transfer pump 37.

  The concentrating device in the present embodiment includes a vacuum pump 64 for reducing the pressure inside the condenser 41. An extraction scrubber 63 is disposed between the vacuum pump 64 and the condenser 41. The extraction scrubber is a water contact device that brings extraction air into contact with water. The extraction scrubber 63 is connected to the condenser 41 so as to suck the steam inside the condenser 41. A pipe 67 for supplying condensed water generated by the condenser 41 is connected to the extraction scrubber 63. A cooler 62 is disposed on the pipe 67. The cooler 62 is a heat exchanger. Cooling water (not shown) is supplied to the cooler 62. The pipe 67 is connected to the downstream side of the transfer pump 37 in the pipe 72. The extraction scrubber 63 is connected to a pipe 68 for returning the condensed water that has come into contact with the steam to the stock solution tank 55.

  The concentrating device in the present embodiment includes a neutralizing liquid tank 56. The neutralization liquid tank 56 stores a neutralization liquid 61 for neutralizing the condensed water. The neutralizing solution 61 in the present embodiment is caustic soda that is an alkali. The neutralizing liquid tank 56 is connected to the pipe 72 so that the neutralizing liquid 61 is supplied to the pipe 72. The neutralizing liquid tank 56 is connected to the downstream side of the connection point of the pipe 67 in the pipe 72. In the present embodiment, the neutralizing liquid tank 56 is connected to the drainage system.

  The concentrating device in the present embodiment includes a horizontal tube type evaporator 52 as a second evaporator for further evaporating and concentrating the processing liquid 60 concentrated in the horizontal tube type evaporator 51. The horizontal tube evaporator 51 is an evaporator on the low concentration side. The horizontal tube evaporator 52 is a concentrator on the high concentration side.

  The configuration of the horizontal tube evaporator 52 is the same as that of the horizontal tube evaporator 51. The horizontal tube evaporator 52 includes the evaporator 21. The evaporator 21 is formed so that the processing liquid 60 can be stored therein. The horizontal tube evaporator 52 includes a heat transfer device 24 that heats and evaporates the processing liquid. The heat transfer device 24 includes a heat transfer tube 24a and header portions 24b and 24c.

  Further, the horizontal tube type evaporator 52 has a tube 77 constituting a circulation channel. The horizontal tube evaporator 52 includes a circulation pump 22 and a spreader 23. The horizontal tube evaporator 52 is formed so that the processing liquid 60 can be circulated by the circulation pump 22 and the processing liquid 60 can be sprayed from the sprayer 23. The spreader 23 is formed so as to spray the treatment liquid 60 toward the heat transfer tube 24a. A pipe 78 for discharging the concentrated concentrate is connected to the outlet of the circulation pump 22. An opening / closing valve 32 is disposed in the pipe 78.

  A pipe 76 is connected to the header portion 24 b of the heat transfer device 24. A boiler as a steam generating device for generating live steam is connected to the pipe 76. A transfer pump 38 is connected to the header portion 24 c of the heat transfer device 24. A pipe 79 for discharging drain water is connected to the transfer pump 38. The transfer pump 38 is formed so that drain water stored in the header portion 24c can be discharged.

  A pipe 80 is connected to the horizontal pipe evaporator 52 as an exhaust pipe for steam generated in the horizontal pipe evaporator 52. The tube 80 is connected to the upper part of the evaporator 21. The pipe 80 is connected to a pipe 71 that is an exhaust pipe of the horizontal tube type evaporator 51. In the concentrator in the present embodiment, the steam generated by the horizontal tube evaporator 51 and the steam generated by the horizontal tube evaporator 52 are mixed. The mixed vapor is condensed by the condenser 41.

  In the concentrator in the present embodiment, a pipe 73 is arranged as a transfer pipe for transferring the processing liquid 60 concentrated in the horizontal pipe evaporator 51 to the horizontal pipe evaporator 52. The pipe 73 is connected to the outlet of the circulation pump 12. The tube 73 is connected to the evaporator 21 of the horizontal tube evaporator 52. An open / close valve 31 is disposed in the pipe 73. By closing the on-off valve 31, the transfer path can be blocked.

  In the concentrator in the present embodiment, as shown by an arrow 81, steam containing nitric acid is supplied to the heat transfer device 14. The steam in the present embodiment does not contain air but contains nitric acid vapor. The steam in the present embodiment is steam at less than atmospheric pressure containing about 1 wt% nitric acid.

  In the present embodiment, the on-off valve 31 is first closed. When the apparatus is started, pure water or dilute nitric acid solution is put into the evaporator 11. As indicated by an arrow 81, steam containing nitric acid is supplied to the header portion 14b of the heat transfer device 14, whereby the heat transfer tube 14a is heated. The steam is condensed and the condensed water is stored in the header portion 14c. The condensed water stored in the header portion 14 c is transferred to the stock solution tank 55 by the transfer pump 35 as indicated by an arrow 82. This condensed water becomes the treatment liquid 60. The processing liquid 60 stored in the stock solution tank 55 is transferred to the evaporator 11 as indicated by an arrow 83 when the transfer pump 36 is driven.

  The treatment liquid 60 stored in the evaporator 11 is transferred to the spreader 13 as indicated by an arrow 84 when the circulation pump 12 is driven. The processing liquid 60 sent to the spreader 13 is spread toward the heat transfer tube 14a. In the heat transfer tube 14a, heat exchange between the treatment liquid 60 and steam containing nitric acid is performed. The processing liquid 60 evaporates on the surface of the heat transfer tube 14a, and the processing liquid 60 stored in the evaporator 11 is concentrated.

  The vapor generated inside the evaporator 11 is transferred to the condenser 41 through the pipe 71 as indicated by an arrow 85. The cooling water is supplied to the condenser 41 as indicated by an arrow 101, and the cooling water is discharged as indicated by an arrow 102, whereby the steam is cooled and condensed.

  The condensed water discharged from the condenser 41 is transferred by the transfer pump 37. This condensed water is drained through a pipe 72 as indicated by an arrow 86. At this time, as shown by an arrow 87, the neutralized liquid 61 is supplied from the neutralized liquid tank 56 to the pipe 72, whereby the waste water is neutralized. In this Embodiment, it neutralizes by supplying an alkali.

  By driving the vacuum pump 64, the vapor inside the condenser 41 is sucked as indicated by an arrow 110. At this time, the steam passes through the extraction scrubber 63. By driving the transfer pump 37, the condensed water generated by the condenser 41 is supplied to the extraction scrubber 63 as indicated by an arrow 111. The condensed water is cooled by passing through the cooler 62.

  In the extraction scrubber 63, condensed water is ejected from the upper part of the tank of the extraction scrubber 63, and the condensed water and the steam come into contact with each other. At this time, nitric acid contained in the vapor is removed. For this reason, the concentration of nitric acid contained in the exhaust of the vacuum pump 64 can be lowered.

  The condensed water that has come into contact with the steam in the extraction scrubber 63 is returned to the stock solution tank 55 through the pipe 68 as indicated by an arrow 112. Condensed water in contact with the steam contains nitric acid. By returning the drainage of the extraction scrubber 63 to the stock solution tank 55, the nitric acid recovery rate can be increased.

  Next, by opening the on-off valve 31, the treatment liquid 60 concentrated in the horizontal tube evaporator 51 is transferred to the horizontal tube evaporator 52 as indicated by an arrow 88. The processing liquid 60 stored in the evaporator 11 is transferred to the evaporator 21. The transfer of the processing liquid 60 in the present embodiment is continuously performed with the open / close valve 31 in the open state when the horizontal tube type evaporator 51 performs the evaporation and concentration. The transfer of the processing liquid 60 may be performed intermittently. Alternatively, the processing liquid 60 may be transferred when the concentration or water level of the processing liquid 60 in the horizontal tube evaporator 51 reaches a predetermined value.

  In the horizontal tube type evaporator 52, as indicated by an arrow 93, the heat transfer device 24 is heated by supplying live steam generated by a steam generating device such as a boiler. When the live steam is supplied to the heat transfer device 24, the heat transfer tube 24a is heated.

  The condensed water of the live steam condensed through the heat transfer tube 24 a is discharged through the tube 79. Condensed water of the heat transfer device 24 is discharged as drain water as indicated by an arrow 94 when the transfer pump 38 is driven.

  In the present embodiment, evaporation is performed with the on-off valve 32 closed. By driving the circulation pump 22, the treatment liquid 60 circulates as indicated by an arrow 92. The processing liquid 60 is supplied to the spreader 23. The processing liquid 60 sprayed from the sprayer 23 undergoes heat exchange with live steam in the heat transfer tube 24a. The processing liquid 60 evaporates on the outer surface of the heat transfer tube 24a. The treatment liquid 60 evaporates and is concentrated.

  The steam discharged from the horizontal tube type evaporator 52 is transferred to the pipe 71 through the pipe 80 as an exhaust pipe as indicated by an arrow 89. In the present embodiment, the steam discharged from the horizontal tube evaporator 52 is mixed with the steam discharged from the horizontal tube evaporator 51 and discharged.

  When the processing liquid concentrated in the horizontal tube type evaporator 52 is recovered, the open / close valve 32 is opened and the concentrated liquid is recovered as indicated by an arrow 95. Collection of the concentrated liquid in the present embodiment is performed by opening the on-off valve 32 when the concentration of the processing liquid 60 in the horizontal tube evaporator 52 reaches a predetermined value. The collection of the concentrated liquid may be performed when the water level of the processing liquid 60 reaches a predetermined value. Alternatively, the concentrated liquid may be collected while the on-off valve 32 is opened while the horizontal tube evaporator 52 is evaporated.

  In the present embodiment, in a horizontal tube evaporator 51 as a first evaporator, steam containing nitric acid is introduced into the heat transfer device 14 as a heating medium. Steam condensate generated in the heat exchanger 14 is introduced into the evaporator 11 via the stock solution tank 55. This configuration or method eliminates the need for another heat source for heating the processing liquid 60 in the horizontal tube evaporator 51. For example, a boiler or the like for generating steam to be supplied to the horizontal tube evaporator 51 is unnecessary. In the present embodiment, the treatment liquid containing the acid can be concentrated using the heat of the vapor containing the acid. For this reason, vapor | steam can be condensed with the apparatus of a simple structure, and also this condensed water can be concentrated as a process liquid.

  In the present embodiment, after the treatment liquid is concentrated in the first evaporator, the treatment liquid can be concentrated to a high concentration in order to further concentrate in the second evaporator. As a result, a high concentration of acid can be recovered.

  In addition, as a method for recovering the acid, there is a method of recovering in the form of a salt. For example, a method of recovering nitric acid in the form of nitrate can be considered. However, recovering in the acid form is more useful than recovering in the salt form because the use after recovery is wider. In the present embodiment, it can be recovered in the form of a highly valuable acid.

  In the present embodiment, the description has been made by taking as an example a concentrating device for recovering nitric acid from steam containing nitric acid, but the present invention is not limited to this form, and for recovering acid from steam containing acid such as acetic acid or hydrochloric acid. The present invention can also be applied to a concentrator.

  In the present embodiment, an apparatus in which two evaporators are connected is employed, but the present invention is not limited to this, and an arbitrary number of evaporators may be connected.

  In this embodiment, a horizontal tube type evaporator is adopted as an evaporator. However, the present invention is not limited to this, and any evaporator using steam as a heat source can be adopted. For example, a flash type evaporator may be employed as the first evaporator, and the treatment liquid may be heated with steam containing acid.

(Embodiment 2)
With reference to FIG. 2, the concentration apparatus and the acid recovery method in the second embodiment will be described.

  FIG. 2 is a schematic system diagram of the concentrating device in the present embodiment. The concentrating device in the present embodiment condenses the steam discharged from the horizontal tube type evaporator 52 as the second evaporator, and then uses the horizontal tube type as the processing liquid 60 for concentrating in the horizontal tube type evaporator 51. It is formed so as to return to the evaporator 51.

  The concentrator in the present embodiment includes a condenser 42 that condenses the vapor generated in the horizontal tube evaporator 52. A pipe 74 is connected to the upper part of the evaporator 21 of the horizontal tube evaporator 52. The pipe 74 is connected so that steam generated inside the evaporator 21 can be discharged. The tube 74 is connected to the condenser 42.

  Cooling water is supplied to the condenser 42 as indicated by an arrow 103. Cooling water is discharged from the condenser 42 as indicated by an arrow 104. A pipe 75 for discharging condensed water is connected to the condenser 42. The pipe 75 is connected to the stock solution tank 55. The condensed water condensed in the condenser 42 is returned to the inside of the evaporator 11 through the stock solution tank 55 and concentrated as the processing solution 60.

  An extraction scrubber 63 is disposed between the vacuum pump 64 and the condenser 41 and between the vacuum pump and the condenser 42. The extraction scrubber 63 in the present embodiment is connected to the condenser 41 and the condenser 42. A pipe 67 is connected to the extraction scrubber 63 so that condensed water generated by the condenser 41 is supplied. A pipe 69 for draining the condensed water that has come into contact with the steam is connected to the extraction scrubber 63 in the present embodiment. The pipe 69 is connected to the drain pipe of the condenser 41. The pipe 69 is connected between the condenser 41 and the transfer pump 37.

  The vapor generated inside the evaporator 21 of the horizontal tube type evaporator 52 is sent to the condenser 42 through the tube 74. In the condenser 42, the steam becomes condensed water. As shown by an arrow 96, the condensed water discharged from the condenser 42 is transferred to the stock solution tank 55 through the pipe 75 and becomes the processing solution 60. The processing liquid 60 stored in the stock solution tank 55 is transferred to the evaporator 11 of the horizontal tube evaporator 51 and concentrated.

  Since the treatment liquid 60 stored in the evaporator 21 is a highly concentrated nitric acid solution, the steam discharged from the horizontal tube evaporator 52 contains nitric acid corresponding to this concentration. Since the concentrating device in the present embodiment is formed so as to return the vapor discharged from the second evaporator to the evaporator of the first evaporator, it is possible to prevent the nitric acid solution having a high concentration from being discarded. .

  For example, in the present embodiment, as shown by an arrow 81, the steam discharged from the nitric acid production facility contains about 1.0 wt% nitric acid. By evaporating the vapor condensate in the horizontal tube type evaporator 51, the concentration of nitric acid in the discharged water as shown by the arrow 86 becomes about 0.15 wt%. Further, the concentrated liquid after being evaporated by the first evaporator and the second evaporator has a concentration of about 30 wt% when it is recovered as a concentrated liquid as indicated by an arrow 95.

  The water vapor discharged when evaporating and concentrating in the horizontal tube type evaporator 52 contains, for example, about 5 wt% nitric acid. In the stock solution tank 55, about 1.0 wt% nitric acid contained in the steam discharged from the nitric acid production facility and about 5 wt% nitric acid condensed water discharged from the condenser 42 are mixed and about 1.4 wt%. become.

  In the present embodiment, the process can be performed again in the horizontal tube type evaporator 51 by transferring the condensed water of the steam discharged from the horizontal tube type evaporator 52 to the stock solution tank 55. The nitric acid discharged from the concentrator in the present embodiment is nitric acid contained in the condensed water discharged as shown by an arrow 86, and the amount of discharged nitric acid can be reduced. That is, the total amount of nitrogen discharged from the concentrator can be reduced. For this reason, it is particularly useful in areas where the total amount of nitrogen is restricted.

  Alternatively, the concentrating device and the acid recovery method in this embodiment can efficiently recover nitric acid. For example, the nitric acid recovery rate in the present embodiment is about 85%, and nitric acid can be recovered at a high recovery rate. Further, the concentration of nitric acid collected in the present embodiment is about 30 wt%, and nitric acid having a commercially high value can be collected.

  In the extraction scrubber 63, the concentration of nitric acid contained in the exhaust of the vacuum pump 64 can be lowered by the contact between the condensed water and the steam. The condensed water that has come into contact with the steam in the extraction scrubber 63 of the present embodiment merges with the condensed water generated in the condenser 41 through the pipe 69 as indicated by an arrow 113. The condensed water that has joined is partly drained through the transfer pump 37 and partly supplied to the extraction scrubber 63 through the pipe 67.

  In the concentrator in the present embodiment, the condensed water of the steam discharged from the second evaporator is transferred to the raw water tank. However, the present invention is not limited to this form, and the steam discharged from the second evaporator is first evaporated. What is necessary is just to be formed so that it may return directly to the evaporator of a vessel. For example, you may form so that the vapor | steam discharged | emitted from a 2nd evaporator may be returned directly to the evaporator of a 1st evaporator.

  Other configurations, operations, and effects are the same as those in the first embodiment, and thus description thereof will not be repeated here.

  The embodiments described above are illustrative rather than limiting the present invention. Moreover, in each figure, the same code | symbol is attached | subjected to the same part or a corresponding part.

1 is a schematic system diagram of a concentrating device in Embodiment 1. FIG. 6 is a schematic system diagram of a concentrating device in Embodiment 2. FIG.

Explanation of symbols

11, 21 Evaporator 12, 22 Circulation pump 13, 23 Spreader 14, 24 Heat transfer device 14a, 24a Heat transfer tube 14b, 14c, 24b, 24c Header part 31, 32 On-off valve 35-38 Transfer pump 41, 42 Condenser 51, 52 Horizontal tube type evaporator 55 Stock solution tank 56 Neutralization solution tank 60 Treatment solution 61 Neutralization solution 62 Cooler 63 Extraction scrubber 64 Vacuum pump 67-80 Tubes 81-89, 92-96, 101-104, 110- 112 arrows

Claims (3)

A concentration device for concentrating vapor containing acid to recover the acid,
A first evaporator including an evaporator for storing the processing liquid and a heat exchanger for heating and evaporating the processing liquid;
The first evaporator introduces steam containing the acid into the heat exchanger as a heating medium, and introduces steam condensate generated by heat exchange with the treatment liquid into the evaporator as the treatment liquid. A concentrating device configured to. The heat transfer unit has a heat transfer tube disposed inside the evaporator,
The concentration device according to claim 1, wherein the first evaporator includes a sprayer that is disposed above the heat transfer tube and sprays the processing liquid toward the heat transfer tube. A second evaporator for further evaporating and concentrating the treatment liquid concentrated in the first evaporator;
The condensed water formed by condensing the vapor generated in the second evaporator is formed so as to be returned to the evaporator of the first evaporator as the processing liquid. The concentration apparatus as described.

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