Sulfuric acid regeneration recycling system

Abstract

The utility model belongs to the technical field of fluorine chemical industry, and particularly relates to a sulfuric acid regeneration recycling system which comprises a regeneration tank, a first steam-jet pump, a second steam-jet pump, a first condenser, a third steam-jet pump, a second condenser, a fourth steam-jet pump and a water ring vacuum pump, and a heating piece is arranged on the regeneration tank. According to the utility model, dilute sulfuric acid which is obtained after a tetrafluoroethylene gas drying process and does not have drying performance can be conveyed into the regeneration tank, and is heated and concentrated under an ultimate vacuum condition to obtain concentrated sulfuric acid with tetrafluoroethylene re-drying performance, and the concentrated sulfuric acid is circularly conveyed to the tetrafluoroethylene gas drying process to be reused, so that the recycling efficiency of the tetrafluoroethylene gas is improved. The whole process is a green production process, environmental pollution and resource waste are reduced, and the regeneration cycle utilization rate of sulfuric acid is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to fluorine chemical technology field, specifically is a kind of sulfuric acid regeneration recycling system. BACKGROUND

[0002] Current fluorine chemical plant mainly through sulfuric acid dry tetrafluoroethylene gas, after tetrafluoroethylene gas drying process, obtain the dilute sulfuric acid without drying performance, current will be discharged after the dilute sulfuric acid after drying by alkali neutralization, but long-term not only cause pollution to environment, also cause resource waste, not in line with current resource recycling production concept, but dilute sulfuric acid is directly put into use, also without drying performance, therefore, the present application designs a kind of sulfuric acid regeneration recycling system to solve the above problems. SUMMARY

[0003] The utility model aims at providing a kind of sulfuric acid regeneration recycling system, dilute sulfuric acid conveyed to regeneration tank can be heated and concentrated to concentrated sulfuric acid with the performance of drying tetrafluoroethylene again under the condition of limit vacuum, and concentrated sulfuric acid with the performance of drying tetrafluoroethylene again is recycled to tetrafluoroethylene gas drying process and is utilized again, the whole process is green production process, reduces environmental pollution and resource waste, improves the regeneration recycling rate of sulfuric acid.

[0004] To solve the above technical problems, the utility model provides a kind of sulfuric acid regeneration recycling system, including regeneration tank, first steam jet pump, second steam jet pump, first condenser, third steam jet pump, second condenser, fourth steam jet pump and water ring vacuum pump, the heating piece is equipped on the regeneration tank, the top of the regeneration tank is equipped with import and steam extraction port respectively, and the bottom is equipped with export, the import is connected with dilute sulfuric acid liquid inlet pipeline, the steam extraction port is connected with the first steam jet pump by first steam extraction pipe, the export is connected with concentrated sulfuric acid liquid outlet pipeline, the steam outlet end of the first steam jet pump is connected with the second steam jet pump by second steam extraction pipe, the second steam jet pump is connected with the first condenser by first conveying pipe, the first condenser is connected with the third steam jet pump by third steam extraction pipe, the third steam jet pump is connected with the second condenser by second conveying pipe, the second condenser is connected with the fourth steam jet pump by fourth steam extraction pipe, the fourth steam jet pump is connected with the water ring vacuum pump by fifth steam extraction pipe, and the air outlet end of the water ring vacuum pump is connected with incondensable gas exhaust pipeline.

[0005] Further, the steam inlet of the first steam jet pump, the second steam jet pump, the third steam jet pump and the fourth steam jet pump is connected into saturated steam main pipe by steam inlet pipeline in parallel.

[0006] Further, the circulating cooling water inlets and outlets of the first and second condensers are connected to the circulating water return and circulating water inlet pipelines through pipes.

[0007] Further, the heating element is a jacket, one side of the jacket is provided with a heat conducting oil inlet, the other side is provided with a heat conducting oil outlet, the heat conducting oil inlet is located above the heat conducting oil outlet, and the temperature of the heat conducting oil in the jacket is 180-200 DEG C.

[0008] Further, the absolute pressure in the regeneration tank is controlled in the range of 0.45-0.55 kPa.

[0009] Further, the pressure of the saturated steam in the saturated steam header is controlled in the range of 0.55-0.65 MPa.

[0010] The beneficial effects of the present application are:

[0011] 1. The sulfuric acid regeneration recycling system can convey the dilute sulfuric acid without drying performance obtained after the tetrafluoroethylene gas drying process to the regeneration tank, heat and concentrate the dilute sulfuric acid to concentrated sulfuric acid with the performance of drying tetrafluoroethylene again under the extreme vacuum condition, and recycle the concentrated sulfuric acid to the tetrafluoroethylene gas drying process for reuse, so that the whole process is a green production process, the environmental pollution and resource waste are reduced, and the sulfuric acid regeneration recycling rate is improved.

[0012] 2. The design of adding the second steam jet pump behind the first steam jet pump can guarantee the suction pressure of the first steam jet pump and the vacuum degree inside the regeneration tank, the high-temperature and high-pressure gas discharged by the second and third steam jet pumps can be cooled through the design of the first and second condensers, heat is transferred to the cooling water at the same time, heat exchange is realized, the heat recovery purpose is achieved, the negative pressure of the water ring vacuum pump is reduced through the design of the fourth steam jet pump, the vacuum time of the water ring vacuum pump is reduced, the stability of the whole system in the vacuum process is improved, and the extreme vacuum condition during the heating and concentration of the dilute sulfuric acid is provided. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description, and obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating any creative labor.

[0014] Figure 1 is a structural schematic view of the sulfuric acid regeneration recycling system of the present application.

[0015] In the figure: 1 - regeneration tank, 2 - first steam jet pump, 3 - second steam jet pump, 4 - first condenser, 5 - third steam jet pump, 6 - second condenser, 7 - fourth steam jet pump, 8 - water ring vacuum pump, 9 - jacket, 10 - dilute sulfuric acid inlet pipeline, 11 - first steam extraction pipe, 12 - concentrated sulfuric acid outlet pipeline, 13 - second steam extraction pipe, 14 - first conveying pipe, 15 - third steam extraction pipe, 16 - second conveying pipe, 17 - fourth steam extraction pipe, 18 - fifth steam extraction pipe, 19 - non-condensable gas exhaust pipeline, 20 - saturated steam header, 21 - circulating backwater pipe, 22 - circulating inlet water pipe, 91 - heat conducting oil inlet, 92 - heat conducting oil outlet. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the utility model specification. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0017] In one specific embodiment of the utility model, as shown in Figure 1 A sulfuric acid regeneration recycling system, including regeneration tank 1, first steam jet pump 2, second steam jet pump 3, first condenser 4, third steam jet pump 5, second condenser 6, fourth steam jet pump 7 and water ring vacuum pump 8, regeneration tank 1 is equipped with heating part, the top of regeneration tank 1 is equipped with inlet and steam extraction port respectively, the bottom is equipped with outlet, inlet is connected with dilute sulfuric acid inlet pipeline 10, steam extraction port is connected with first steam jet pump 2 through first steam extraction pipe 11, outlet is connected with concentrated sulfuric acid outlet pipeline 12, the steam outlet end of first steam jet pump 2 is connected with second steam jet pump 3 through second steam extraction pipe 13, second steam jet pump 3 is connected with first condenser 4 through first conveying pipe 14, first condenser 4 is connected with third steam jet pump 5 through third steam extraction pipe 15, third steam jet pump 5 is connected with second condenser 6 through second conveying pipe 16, second condenser 6 is connected with fourth steam jet pump 7 through fourth steam extraction pipe 17, fourth steam jet pump 7 is connected with water ring vacuum pump 8 through fifth steam extraction pipe 18, the gas outlet end of water ring vacuum pump 8 is connected with non-condensable gas exhaust pipeline 19.

[0018] The sulfuric acid regeneration recycling system can obtain dilute sulfuric acid without drying performance after the tetrafluoroethylene gas drying process, and the dilute sulfuric acid is conveyed into a regeneration tank, and is heated and concentrated under the extreme vacuum condition to be concentrated sulfuric acid with the performance of drying tetrafluoroethylene again, and the concentrated sulfuric acid is recycled and conveyed to the tetrafluoroethylene gas drying process for reuse, the whole process is a green production process, and the environmental pollution and resource waste are reduced, and the regeneration recycling rate of sulfuric acid is improved.

[0019] The utility model discloses a design that second steam jet pump 3 is added behind first steam jet pump 2, can guarantee the suction pressure of first steam jet pump 2, guarantee the vacuum degree in the inside of regeneration tank 1, and through the design of first condenser 4 and second condenser 6, can cool the high temperature and high pressure gas of second steam jet pump 3 and third steam jet pump 5, simultaneously pass the heat to cooling water, realize heat exchange, reach the heat recovery purpose, combine the design of fourth steam jet pump 7, can reduce the negative pressure of water ring vacuum pump 8, reduce the vacuum time of water ring vacuum pump 8, improve the stability of whole system in the vacuum process, provide the extreme vacuum condition when dilute sulfuric acid heating concentration.

[0020] Specifically, in the embodiment, the steam inlets of the first steam jet pump 2, the second steam jet pump 3, the third steam jet pump 5 and the fourth steam jet pump 7 are connected in parallel into the saturated steam main pipe 20 through steam inlets, and the parallel design can simplify the pipeline arrangement, reduce steam loss and improve gas supply efficiency.

[0021] In the embodiment, the circulating cooling water inlets and outlets of the first condenser 4 and the second condenser 6 are connected in parallel into the circulating backwater pipe 21 and the circulating inlet water pipe 22 through pipelines, and the pipeline parallel design can simplify the pipeline arrangement, ensure that the flow and pressure of the first condenser 4 and the second condenser 6 are consistent, avoid the difference in cooling effect caused by different pipeline resistances, and improve the reliability of the system.

[0022] In the embodiment, the heating element is a jacket 9, one side of the jacket 9 is provided with a heat conducting oil inlet 91, the other side is provided with a heat conducting oil outlet 92, the heat conducting oil inlet 91 is located above the heat conducting oil outlet 92, and the temperature of the heat conducting oil in the jacket 9 is 180-200 DEG C. Of course, in order to improve the heat exchange effect and increase the heat transfer area, the heating element can also be a coil, and the coil is installed in the regeneration tank 1.

[0023] In the embodiment, the regeneration tank 1 is provided with a pressure gauge, and the absolute pressure in the regeneration tank 1 is controlled in the range of 0.45kpa-0.55kpa; the pressure of the saturated steam in the saturated steam main pipe 20 is controlled in the range of 0.55kpa-0.65Mpa.

[0024] The working process of the embodiment is as follows:

[0025] The 85% dilute sulfuric acid solution after fluorinated plant drys tetrafluoroethylene gas is transported into the regeneration tank 1 through the dilute sulfuric acid inlet pipeline 10, the dilute sulfuric acid is heated to 147-153 DEG C through the heat conducting oil of 180 DEG C into the jacket 9, at the same time, vacuum is extracted through the first steam jet pump 2, the second steam jet pump 3, the third steam jet pump 5 and the fourth steam jet pump 7, finally, the incondensable gas is discharged into the atmosphere through the incondensable gas exhaust pipeline 19 through the water ring vacuum pump 8, wherein, the 0.6Mpa saturated steam in the saturated steam main pipe 20 is used as the driving force of the first steam jet pump 2, the second steam jet pump 3, the third steam jet pump 5 and the fourth steam jet pump 7, the absolute pressure in the regeneration tank 1 is controlled at 0.5kpa, the concentration of the dilute sulfuric acid under the heating temperature and pressure can be concentrated to 93-95%, the concentrated sulfuric acid has the performance of drying tetrafluoroethylene again, then the concentrated sulfuric acid after concentration is recycled and transported to the tetrafluoroethylene gas drying process through the pipeline, the purpose of regeneration and recycling is achieved, the whole process is a green production process, the environmental pollution and resource waste are reduced, and the regeneration and recycling rate of sulfuric acid is improved.

[0026] The above only discloses a preferred embodiment of the utility model, of course, cannot with this to limit the utility model right scope, therefore the equivalent change made by the utility model claim still belongs to the range covered by the utility model.

Claims

1. A sulfuric acid regeneration and recycling system, characterized in that, The system includes a regeneration tank (1), a first steam jet pump (2), a second steam jet pump (3), a first condenser (4), a third steam jet pump (5), a second condenser (6), a fourth steam jet pump (7), and a water ring vacuum pump (8). The regeneration tank (1) is equipped with a heating element. The top of the regeneration tank (1) is equipped with an inlet and a steam extraction port, and the bottom is equipped with an outlet. The inlet is connected to a dilute sulfuric acid inlet pipe (10). The steam extraction port is connected to the first steam jet pump (2) through a first steam extraction pipe (11). The outlet is connected to a concentrated sulfuric acid outlet pipe (12). The first steam jet pump (2) is connected to the second steam jet pump (8) through a second steam extraction pipe (13). The steam jet pump (3) is connected, the second steam jet pump (3) is connected to the first condenser (4) through the first delivery pipe (14), the first condenser (4) is connected to the third steam jet pump (5) through the third extraction pipe (15), the third steam jet pump (5) is connected to the second condenser (6) through the second delivery pipe (16), the second condenser (6) is connected to the fourth steam jet pump (7) through the fourth extraction pipe (17), the fourth steam jet pump (7) is connected to the water ring vacuum pump (8) through the fifth extraction pipe (18), and the outlet end of the water ring vacuum pump (8) is connected to a non-condensable gas exhaust pipe (19).

2. The sulfuric acid regeneration and recycling system according to claim 1, characterized in that, The steam inlets of the first steam jet pump (2), the second steam jet pump (3), the third steam jet pump (5), and the fourth steam jet pump (7) are all connected in parallel to the saturated steam main pipe (20) through steam inlet pipes.

3. The sulfuric acid regeneration and recycling system according to claim 1, characterized in that, The circulating cooling water inlet and circulating cooling water outlet of the first condenser (4) and the second condenser (6) are connected in parallel to the circulating return water pipe (21) and the circulating inlet water pipe (22) through pipelines.

4. The sulfuric acid regeneration and recycling system according to claim 1, characterized in that, The heating element is a jacket (9). One side of the jacket (9) is provided with a heat transfer oil inlet (91) and the other side is provided with a heat transfer oil outlet (92). The heat transfer oil inlet (91) is located above the heat transfer oil outlet (92). The temperature of the heat transfer oil in the jacket (9) is 180-200℃.

5. The sulfuric acid regeneration and recycling system according to claim 1, characterized in that, The regeneration tank (1) is equipped with a pressure gauge, and the absolute pressure range inside the regeneration tank (1) is controlled between 0.45 kPa and 0.55 kPa.

6. The sulfuric acid regeneration and recycling system according to claim 2, characterized in that, The pressure of saturated steam in the saturated steam main (20) is controlled between 0.55 kPa and 0.65 MPa.

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