A fluorine-containing mixed acid distillation system for improving waste acid treatment effect

Abstract

The utility model relates to the technical field of distillation systems, and specifically discloses a fluorine-containing mixed acid distillation system for improving the waste acid treatment effect, including a sulfuric acid heat exchanger, a desulfurization acid-making device, a sulfuric acid water cooler, a sulfuric acid storage tank, a first distillation tower, a first distillation tower top tank and a first distillation tower top cooler, the top inlet of the sulfuric acid heat exchanger is connected with a sulfuric acid pipeline, the top outlet is connected to the middle and upper part of the first distillation tower, the bottom inlet is connected to the desulfurization acid-making device, and the bottom outlet is connected to a side inlet of the sulfuric acid water cooler. The design of the distillation system in the utility model can exchange heat between the mixed acid output from the desulfurization acid-making device and the sulfuric acid output from the sulfuric acid pipeline, and the sulfuric acid after heat exchange is divided into two parts, one part is water-cooled to obtain sulfuric acid, and the other part enters the first distillation tower for distillation, and the top gas of the first distillation tower is cooled and then pumped into the first distillation tower by the first distillation tower top pump for distillation again, so that the sulfuric acid in the mixed acid can be extracted with maximum efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of distillation systems, in particular to a fluorine-containing mixed acid distillation system for improving the waste acid treatment effect. Background Art

[0002] Mixed acid is also called mixed acid, also known as super acid, which is stronger than 100% sulfuric acid. The existing distillation system has low acid production efficiency when distilling mixed acid and sulfuric acid. At the same time, when treating waste acid, there are usually problems such as the inability to control the waste acid flow rate and poor impurity interception effect in the waste acid. Therefore, it is urgently necessary to design a fluorine-containing mixed acid distillation system that improves the waste acid treatment effect to solve the above problems. Utility Model Content

[0003] The utility model aims to provide a fluorine-containing mixed acid distillation system for improving the waste acid treatment effect, solving the above-mentioned problems of low acid production efficiency of the existing distillation system and uncontrollable flow rate of waste acid and impurity interception.

[0004] In order to solve the above technical problems, the utility model provides a fluorine-containing mixed acid distillation system for improving the waste acid treatment effect, comprising a sulfuric acid heat exchanger, a desulfurization acid-making device, a sulfuric acid water cooler, a sulfuric acid storage tank, a first distillation tower, a first distillation tower top tank and a first distillation tower top cooler, the top inlet of the sulfuric acid heat exchanger is connected to a sulfuric acid pipeline, the top outlet is connected to the middle and upper part of the first distillation tower, the bottom inlet is connected to the desulfurization acid-making device, the bottom outlet is connected to a side inlet of the sulfuric acid water cooler, and the other side outlet of the sulfuric acid water cooler is connected to the sulfuric acid storage tank through a pipeline.

[0005] The first outlet at the top of the first distillation tower is connected to the exhaust gas main through an overpressure discharge pipeline, the second outlet at the top is connected to the inlet on one side of the first distillation tower top cooler through a cooling pipeline, the outlet on the other side of the first distillation tower top cooler is connected to the inlet on one side of the first distillation tower top tank through a pipeline, the outlet on one side of the first distillation tower top tank is connected to the exhaust gas main through a non-condensable gas pipeline, and the outlet on the other side is connected to the inlet on one side of the first distillation tower through a first reflux pipeline, and a plurality of first distillation tower top pumps are provided on the first reflux pipeline, and the outlet of each of the first distillation tower top pumps is connected to a fluorine-containing waste acid treatment device through a waste acid discharge pipeline.

[0006] Furthermore, two ends of the first distillation tower top tank are respectively connected to a second reflux pipeline, and a first on-site installation instrument is provided on the second reflux pipeline.

[0007] Furthermore, an orifice flowmeter, a stop valve and a pneumatic diaphragm regulating valve are sequentially installed on the waste acid discharge pipeline, the orifice flowmeter is connected to a second locally installed instrument, the second locally installed instrument is connected to a first DCS instrument, the pneumatic diaphragm regulating valve is connected to a third locally installed instrument, the third locally installed instrument is connected to the first DCS instrument, the first DCS instrument is connected to a second DCS instrument, and the second DCS instrument is connected to the first locally installed instrument.

[0008] Furthermore, the lower outer inlet of the first distillation tower is connected to a reboiler, the bottom outlet is connected to a first circulation pipeline, the first circulation pipeline is connected to a second distillation tower, the first circulation pipeline is connected to a second circulation pipeline, the other end of the second circulation pipeline is connected to the bottom inlet of the reboiler, and the first circulation pipeline is provided with a plurality of first distillation tower bottom pumps.

[0009] Furthermore, one side inlet of the reboiler is connected to a steam main pipeline, and one side outlet is connected to a condensed water main pipeline.

[0010] Beneficial effects of the utility model: the design of the distillation system in the utility model can perform heat exchange between the mixed acid output from the desulfurization acid-making device and the sulfuric acid output from the sulfuric acid pipeline. The sulfuric acid after heat exchange is divided into two parts, one part is obtained by water cooling to obtain sulfuric acid, and the other part enters the first distillation tower for distillation. The top gas of the first distillation tower is cooled and then pumped into the first distillation tower by the top pump of the first distillation tower for distillation again. When the distillation reaches the specified index, it is pumped into the fluorine-containing waste acid treatment device by the top pump of the first distillation tower, so that the sulfuric acid in the mixed acid can be extracted with the maximum efficiency, so as to improve the acid-making efficiency of the system and the purity of the sulfuric acid, and at the same time, the amount of waste acid can be reduced, and the amount of impurities in the waste acid can also be reduced;

[0011] The design of the circulation route of the reboiler part can make the heavy components of the mixed acid during distillation be transmitted through the pipeline, then recycled through the reboiler for vaporization and then enter the first distillation tower for reaction, thereby improving the distillation efficiency of the materials in the first distillation tower, and at the same time, maintaining the temperature balance of the materials in the reboiler and the first distillation tower, thereby reducing the energy consumption of the first distillation tower;

[0012] The design of the first on-site installed instrument, the second DCS instrument connected to the first on-site installed instrument, and the control instrument on the waste acid discharge pipeline can effectively filter the waste acid while controlling the flow and flow of the waste acid to improve the treatment effect of the waste acid and prevent the waste acid from polluting the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 This is the overall structural diagram of a fluorine-containing mixed acid distillation system for improving the waste acid treatment effect of the utility model;

[0015] In the figure: 1-sulfuric acid heat exchanger, 2-desulfurization acid production device, 3-sulfuric acid water cooler, 4-sulfuric acid storage tank, 5-first distillation tower, 6-first distillation tower top tank, 7-first distillation tower top cooler, 8-sulfuric acid pipeline, 9-reboiler, 10-first circulation pipeline, 11-second circulation pipeline, 12-overpressure discharge pipeline, 13-tail gas main pipe, 14-cooling pipeline, 15-non-condensable gas pipeline, 16-first reflux pipeline, 17-first distillation tower top pump, 1 8-waste acid discharge pipeline, 19-fluorine-containing waste acid treatment device, 20-bottom pump of the first distillation tower, 21-second distillation tower, 22-steam main pipeline, 23-condensate main pipeline, 24-second reflux pipeline, 25-first on-site instrument, 26-orifice flowmeter, 27-stop valve, 28-pneumatic diaphragm regulating valve, 29-second on-site instrument, 30-first DCS instrument, 31-third on-site instrument, 32-second DCS instrument. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings of the utility model specification to clearly and completely describe the technical solutions in the utility model embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] In a specific embodiment of the present invention, Figure 1 As shown, a fluorine-containing mixed acid distillation system for improving the waste acid treatment effect is specifically disclosed, comprising a sulfuric acid heat exchanger 1, a desulfurization acid-making device 2, a sulfuric acid water cooler 3, a sulfuric acid storage tank 4, a first distillation tower 5, a first distillation tower top tank 6 and a first distillation tower top cooler 7, the top inlet of the sulfuric acid heat exchanger 1 is connected to a sulfuric acid pipeline 8, the top outlet is connected to the middle and upper part of the first distillation tower 5, the bottom inlet is connected to the desulfurization acid-making device 2, the bottom outlet is connected to a side inlet of the sulfuric acid water cooler 3, and the other side outlet of the sulfuric acid water cooler 3 is connected to the sulfuric acid storage tank 4 through a pipeline.

[0018] The first outlet at the top of the first distillation tower 5 is connected to the tail gas main 13 through an overpressure discharge pipeline 12, the second outlet at the top is connected to the inlet on one side of the first distillation tower top cooler 7 through a cooling pipeline 14, the outlet on the other side of the first distillation tower top cooler 7 is connected to the inlet on one side of the first distillation tower top tank 6 through a pipeline, the outlet on one side of the first distillation tower top tank 6 is connected to the tail gas main 13 through a non-condensable gas pipeline 15, and the outlet on the other side is connected to the inlet on one side of the first distillation tower 5 through a first reflux pipeline 16, a plurality of first distillation tower top pumps 17 are provided on the first reflux pipeline 16, and the outlet of each first distillation tower top pump 17 is connected to a fluorine-containing waste acid treatment device 19 through a waste acid discharge pipeline 18, and the waste acid discharge pipeline The feed end of 18 is connected to the middle part of the first reflux pipe 16. The design of the distillation system can exchange heat between the mixed acid output from the desulfurization acid-making device and the sulfuric acid output from the sulfuric acid pipeline. The sulfuric acid after heat exchange is divided into two parts, one part is obtained by water cooling to obtain sulfuric acid, and the other part enters the first distillation tower 5 for distillation. After the top gas of the first distillation tower 5 is cooled, it is pumped into the first distillation tower 5 through the first distillation tower top pump 17 for distillation again. When the distillation reaches the specified index, it is pumped into the fluorine-containing waste acid treatment device 19 through the first distillation tower top pump 17. The sulfuric acid in the mixed acid can be extracted with maximum efficiency to improve the acid-making efficiency of the system and the purity of sulfuric acid. At the same time, the amount of waste acid can be reduced, and the amount of impurities in the waste acid can also be reduced.

[0019] The two ends of the first distillation tower top tank 6 are respectively connected to the second reflux pipeline 24, and the second reflux pipeline 24 is provided with a first locally installed instrument 25; the waste acid discharge pipeline 18 is sequentially installed with an orifice flowmeter 26, a stop valve 27 and a pneumatic diaphragm regulating valve 28, the orifice flowmeter 26 is connected to the second locally installed instrument 29, the second locally installed instrument 29 is connected to the first DCS instrument 30, the pneumatic diaphragm regulating valve 28 is connected to the third locally installed instrument 31, the third locally installed instrument 31 is connected to the first DCS instrument 30, the first DCS instrument 30 is connected to the second DCS instrument 32, the second DCS instrument 32 is connected to the first locally installed instrument 25, the first locally installed instrument 25, the second DCS instrument 32 connected to the first locally installed instrument 25, and the design of the control instruments and meters on the waste acid discharge pipeline 18 can effectively filter the waste acid while controlling the flow and flow of the waste acid to improve the treatment effect of the waste acid and prevent the waste acid from polluting the environment.

[0020] The lower outer inlet of the first distillation tower 5 is connected to a reboiler 9, one side inlet of the reboiler 9 is connected to a steam main pipeline 22, one side outlet is connected to a condensed water main pipeline 23, and the bottom outlet is connected to a first circulation pipeline 10, the first circulation pipeline 10 is connected to a second distillation tower 21, the middle of the first circulation pipeline 10 is connected to a second circulation pipeline 11, and the other end of the second circulation pipeline 11 is connected to the bottom inlet of the reboiler 9. A plurality of first distillation tower bottom pumps 20 are provided on the first circulation pipeline 10. The design of the circulation route at the reboiler 9 can make the heavy components of the mixed acid during distillation be recycled through the reboiler 9 after being transferred through the pipeline and vaporized before entering the first distillation tower 5 for reaction, thereby improving the distillation efficiency of the material in the first distillation tower 5, and at the same time, the temperature balance of the material in the reboiler 9 and the first distillation tower 5 can be maintained, thereby reducing the energy consumption of the first distillation tower 5.

[0021] The workflow of this utility model:

[0022] Sulfuric acid is transported to the sulfuric acid heat exchanger 1 through the sulfuric acid pipeline 8, and the mixed acid in the desulfurization acid-making device 2 is transported to the sulfuric acid heat exchanger 1 through the pipeline. The two acids are mixed in the sulfuric acid heat exchanger 1 and heat exchanged at the same time. A part of the sulfuric acid after heat exchange enters the sulfuric acid water cooler 3 for water cooling, and the sulfuric acid obtained after water cooling is transported to the sulfuric acid storage tank 4. The other part of the raw mixed acid after heat exchange is transported to the first distillation tower 5 for distillation. The top gas of the first distillation tower 5 enters the first distillation tower top cooler 7 through the cooling pipeline 14 for cooling, and the cooled top gas is transported to the first distillation tower top tank 6.

[0023] The condensed gas in the tank is monitored by the first on-site instrument 25 installed on both sides of the first distillation tower top tank 6, and the non-condensable gas in the first distillation tower top tank 6 is transported to the tail gas main 13 through the non-condensable gas pipeline 15, and the liquid phase in the first distillation tower top tank 6 is returned to the top of the first distillation tower 5 through the first reflux pipeline 16, and the gas and non-condensable gas generated by the reaction with the hot material in the first distillation tower 5 are further transported to the first distillation tower top cooler 7 from the cooling pipeline 14 and the non-condensable gas pipeline 15 respectively, and then continue to circulate and transport in the above order. When the second reflux pipelines on both sides of the first distillation tower top tank 6 are When the first on-site instrument 25 on the waste acid discharge pipe 24 detects that the waste acid discharge standard is met, the first on-site instrument 25 sends the collected data to the control unit, and the control unit sends a signal to the second DCS instrument 32, the first DCS instrument 30, the third on-site instrument 31 and the second on-site instrument 29 to collect the data of the orifice flow meter 26 on the waste acid discharge pipe 18 respectively, and control the opening and closing of the stop valve 27 and the pneumatic diaphragm regulating valve 28 through the collected data to control the flow rate and flow velocity of the waste acid, so as to transport the waste acid to the fluorine-containing waste acid treatment device 19 for waste acid treatment;

[0024] When the first distillation tower 5 is distilling, the material at the bottom of the tower is transported from the first circulation pipeline 10 to the first distillation tower bottom pump 20, and the first distillation tower bottom pump 20 pumps the material into the reboiler 9 through the second circulation pipeline 11. The reboiler 9 vaporizes the material and then transports it to the first distillation tower 5 to improve the distillation efficiency of the system.

[0025] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A fluorine-containing mixed acid distillation system for improving the waste acid treatment effect, characterized in that: The invention comprises a sulfuric acid heat exchanger (1), a desulfurization and acid-making device (2), a sulfuric acid water cooler (3), a sulfuric acid storage tank (4), a first distillation tower (5), a first distillation tower top tank (6) and a first distillation tower top cooler (7), wherein the top inlet of the sulfuric acid heat exchanger (1) is connected to a sulfuric acid pipeline (8), the top outlet is connected to the middle and upper part of the first distillation tower (5), the bottom inlet is connected to the desulfurization and acid-making device (2), the bottom outlet is connected to a side inlet of the sulfuric acid water cooler (3), and the other side outlet of the sulfuric acid water cooler (3) is connected to the sulfuric acid storage tank (4) through a pipeline. The first outlet at the top of the first distillation tower (5) is connected to the tail gas main pipe (13) through an overpressure discharge pipeline (12), the second outlet at the top is connected to the inlet of one side of the first distillation tower top cooler (7) through a cooling pipeline (14), the outlet on the other side of the first distillation tower top cooler (7) is connected to the inlet of one side of the first distillation tower top tank (6) through a pipeline, the outlet on one side of the first distillation tower top tank (6) is connected to the tail gas main pipe (13) through a non-condensable gas pipeline (15), and the outlet on the other side is connected to the inlet of one side of the first distillation tower (5) through a first reflux pipeline (16), a plurality of first distillation tower top pumps (17) are connected in parallel to the first reflux pipeline (16) through pipelines, and the outlet of each of the first distillation tower top pumps (17) is connected to a fluorine-containing waste acid treatment device (19) through a waste acid discharge pipeline (18).

2. A fluorine-containing mixed acid distillation system for improving waste acid treatment effect according to claim 1, characterized in that: The two ends of the first distillation tower top tank (6) are respectively connected to a second reflux pipeline (24), and the second reflux pipeline (24) is provided with a first on-site installation instrument (25).

3. A fluorine-containing mixed acid distillation system for improving waste acid treatment effect according to claim 2, characterized in that: An orifice flowmeter (26), a stop valve (27) and a pneumatic diaphragm regulating valve (28) are sequentially installed on the waste acid discharge pipeline (18); the orifice flowmeter (26) is connected to a second locally installed instrument (29); the second locally installed instrument (29) is connected to a first DCS instrument (30); the pneumatic diaphragm regulating valve (28) is connected to a third locally installed instrument (31); the third locally installed instrument (31) is connected to the first DCS instrument (30); the first DCS instrument (30) is connected to a second DCS instrument (32); the second DCS instrument (32) is connected to the first locally installed instrument (25).

4. A fluorine-containing mixed acid distillation system for improving waste acid treatment effect according to claim 1, characterized in that: The lower outer inlet of the first distillation tower (5) is connected to a reboiler (9), and the bottom outlet is connected to a first circulation pipeline (10). The first circulation pipeline (10) is connected to a second distillation tower (21). The first circulation pipeline (10) is connected to a second circulation pipeline (11). The other end of the second circulation pipeline (11) is connected to the bottom inlet of the reboiler (9). The first circulation pipeline (10) is connected in parallel to a plurality of first distillation tower bottom pumps (20) via pipelines.

5. A fluorine-containing mixed acid distillation system for improving waste acid treatment effect according to claim 4, characterized in that: One side inlet of the reboiler (9) is connected to a steam main pipeline (22), and one side outlet is connected to a condensed water main pipeline (23).

Images