CN215626802U - Dilute sulfuric acid cyclic utilization system - Google Patents
Dilute sulfuric acid cyclic utilization system Download PDFInfo
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- CN215626802U CN215626802U CN202120130322.3U CN202120130322U CN215626802U CN 215626802 U CN215626802 U CN 215626802U CN 202120130322 U CN202120130322 U CN 202120130322U CN 215626802 U CN215626802 U CN 215626802U
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Abstract
The utility model relates to the technical field of chemical industry, in particular to a dilute sulfuric acid recycling system, which comprises a circulating tank, a mixer and a heat exchanger, wherein the circulating tank, the mixer and the heat exchanger are sequentially connected through pipelines, and an outlet of the heat exchanger is connected with an inlet of the circulating tank through a pipeline; be provided with the bypass pipeline between blender and the circulation tank, the circulation tank is connected with tail gas absorbing device, and the heat exchanger links to each other with concentrated sulfuric acid storage tank, and concentrated sulfuric acid storage tank is connected with concentrated sulfuric acid delivery pump, is provided with the governing valve on the bypass pipeline, and the liquid level is established with concentrated sulfuric acid in the circulation tank. Dilute sulfuric acid is concentrated to 98% in a circulating absorption mode, and a bypass adjusting valve is arranged to prevent sulfuric acid crystallization caused by low temperature of an outlet of a plate heat exchanger; the phenomenon that dilute sulfuric acid and sulfur trioxide directly react and release heat violently can be prevented, the reaction severity can be reduced, and the absorption effect of the sulfur trioxide can be improved; greatly reducing the yield of dilute sulfuric acid; the operation process is safe and reliable.
Description
Technical Field
The utility model relates to the technical field of chemical industry, in particular to a dry dilute sulfuric acid recycling system.
Background
The information in this background section is only for enhancement of understanding of the general background of the utility model and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
At present, in the production process of the domestic chemical industry, concentrated sulfuric acid is used for drying in most drying procedures, and the concentration of dilute sulfuric acid generated in the transformation process is about 78-90%. The dilute sulfuric acid can not be reused, and a large amount of dilute sulfuric acid is byproduct every year. If the dilute sulfuric acid is directly discharged, water or soil can be acidified, so that environmental pollution is caused, but the dilute sulfuric acid concentration system in the prior art generally has great cost investment but small benefit, and has certain disadvantages.
Disclosure of Invention
In order to solve the technical problems in the prior art, the utility model aims to provide a dilute sulfuric acid recycling system, which greatly reduces the yield of dilute sulfuric acid, is safe and reliable in operation process, and can directly recover concentrated sulfuric acid to avoid waste.
In order to achieve the purpose, the technical scheme of the utility model is as follows:
a dilute sulfuric acid recycling system comprises a circulating tank, a mixer and a heat exchanger, wherein the circulating tank, the mixer and the heat exchanger are sequentially connected through pipelines, and an outlet of the heat exchanger is connected with an inlet of the circulating tank through a pipeline;
and a bypass pipeline is arranged between the mixer and the circulating tank.
Preferably, the circulating tank is connected with a tail gas absorption device;
preferably, the heat exchanger is connected with a concentrated sulfuric acid storage tank; preferably, the concentrated sulfuric acid storage tank is connected with a concentrated sulfuric acid delivery pump;
preferably, the bypass pipeline is provided with a regulating valve;
preferably, a circulating pump is arranged between the circulating tank and the mixer;
preferably, the heat exchanger is a plate heat exchanger;
preferably, concentrated sulfuric acid is used for establishing a liquid level in the circulating tank;
preferably, a dilute sulfuric acid inlet is arranged on the circulating tank;
preferably, the mixer is provided with a sulfur trioxide inlet.
The utility model has the beneficial effects that:
the method comprises the steps of adding sulfur trioxide liquid into dilute sulfuric acid, concentrating the dilute sulfuric acid to 98% in a circulating absorption mode, and then reusing the concentrated sulfuric acid in a drying system;
the bypass regulating valve is arranged to automatically regulate according to the outlet temperature of the plate heat exchanger, so that the sulfuric acid crystallization caused by low outlet temperature of the plate heat exchanger can be prevented;
dilute sulfuric acid is added into the system from the sulfuric acid circulating tank, and the dilute sulfuric acid is mixed with concentrated sulfuric acid in the system and then enters the mixer to react with sulfur trioxide, so that the phenomenon that the dilute sulfuric acid and the sulfur trioxide directly react and release heat violently can be prevented, the sulfur trioxide is ensured to be always subjected to a mixed reaction with sulfuric acid with the concentration of about 98%, and the violent degree of the reaction can be reduced, and the absorption effect of the sulfur trioxide can be improved;
greatly reducing the yield of dilute sulfuric acid; the operation process is safe and reliable, the concentrated sulfuric acid can be directly recovered, and the waste is avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model.
FIG. 1 is a schematic flow diagram of the system of the present invention;
in the figure, 1, a tail gas absorption device, 2, dilute sulfuric acid, 3, a circulating tank, 4, a mixer, 5, sulfur trioxide, 6, a plate heat exchanger, 7, a concentrated sulfuric acid storage tank, 8, a circulating pump, 9, a concentrated sulfuric acid delivery pump, 10 and a regulating valve.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the utility model as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the utility model. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1, a dilute sulfuric acid recycling system comprises a circulation tank 3, a mixer 4 and a plate heat exchanger 6, wherein the circulation tank 3, the mixer 4 and the plate heat exchanger 6 are sequentially connected through a pipeline, and an outlet of the plate heat exchanger 6 is connected with an inlet of the circulation tank 3 through a pipeline; a bypass pipeline is arranged between the mixer 4 and the circulating tank 3, and is provided with an adjusting valve; the liquid level is established by concentrated sulfuric acid in the circulating tank, and the circulating tank is connected with a tail gas absorption device 1;
the plate heat exchanger 6 is connected with a concentrated sulfuric acid storage tank 7, and the concentrated sulfuric acid storage tank 7 is connected with a concentrated sulfuric acid delivery pump 9;
a circulating pump is arranged between the circulating tank 3 and the mixer 4, and the liquid level is established in the circulating tank 3 by concentrated sulfuric acid; a dilute sulfuric acid inlet is arranged on the circulating tank 3; the mixer 4 is provided with a sulfur trioxide inlet.
When the dilute sulfuric acid recycling system works, the liquid level is established in the circulating tank by concentrated sulfuric acid, and a circulating pump is started for circulation; dilute sulfuric acid enters a circulating tank through a pipeline, concentrated sulfuric acid and the dilute sulfuric acid in the circulating tank are mixed and then enter a mixer, sulfur trioxide liquid is accurately metered through a flowmeter and then directly enters a static mixer to be mixed and reacted with the dilute sulfuric acid, the concentration of the dilute sulfuric acid is increased after the dilute sulfuric acid absorbs the sulfur trioxide through the mixer, and the concentration of the dilute sulfuric acid is increased to 98 percent and becomes the concentrated sulfuric acid; and the obtained concentrated sulfuric acid enters a heat exchanger for cooling, the heat generated by the reaction is removed and enters a circulation tank, one part of the cooled concentrated sulfuric acid returns to the circulation tank through a bypass pipeline for circulating absorption, and the other part of the concentrated sulfuric acid is extracted and enters a concentrated sulfuric acid storage tank for standby use. And a tail gas emptying pipe is arranged at the top of the circulating groove, and tail gas is absorbed by an absorption device and then is discharged.
In the utility model, sulfur trioxide liquid is added into dilute sulfuric acid, the dilute sulfuric acid is concentrated to 98% in a circulating absorption mode, and then the concentrated sulfuric acid can be recycled into a drying system, so that a bypass adjusting valve is arranged to automatically adjust according to the outlet temperature of a plate heat exchanger in order to prevent the occurrence of sulfuric acid crystallization caused by low outlet temperature of the plate heat exchanger; and in order to prevent the phenomenon that dilute sulfuric acid and sulfur trioxide directly react and release heat violently, dilute sulfuric acid is added into the system from the sulfuric acid circulating tank, and the dilute sulfuric acid is mixed with concentrated sulfuric acid in the system and then enters the mixer to react with sulfur trioxide in a mixing manner, so that the sulfur trioxide is ensured to react with sulfuric acid with the concentration of about 98% all the time in a mixing manner, the reaction intensity can be reduced, and the absorption effect of the sulfur trioxide can be improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The dilute sulfuric acid recycling system is characterized by comprising a circulating tank, a mixer and a heat exchanger, wherein the circulating tank, the mixer and the heat exchanger are sequentially connected through pipelines, and an outlet of the heat exchanger is connected with an inlet of the circulating tank through a pipeline;
and a bypass pipeline is arranged between the mixer and the circulating tank.
2. The dilute sulfuric acid recycling system of claim 1, wherein the circulation tank is connected to a tail gas absorption device.
3. The dilute sulfuric acid recycling system according to claim 1, wherein the heat exchanger is connected to a concentrated sulfuric acid storage tank.
4. The dilute sulfuric acid recycling system according to claim 3, wherein the concentrated sulfuric acid storage tank is connected with a concentrated sulfuric acid delivery pump.
5. The dilute sulfuric acid recycling system of claim 1, wherein the bypass line is provided with a regulating valve.
6. The dilute sulfuric acid recycling system according to claim 1, wherein a circulation pump is provided between the circulation tank and the mixer.
7. The dilute sulfuric acid recycling system of claim 1, wherein the heat exchanger is a plate heat exchanger.
8. The dilute sulfuric acid recycling system of claim 1, wherein a level of concentrated sulfuric acid is established in the circulation tank.
9. The dilute sulfuric acid recycling system according to claim 1, wherein the circulation tank is provided with a dilute sulfuric acid inlet.
10. The dilute sulfuric acid recycling system of claim 1, wherein the mixer is provided with a sulfur trioxide inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120130322.3U CN215626802U (en) | 2021-01-18 | 2021-01-18 | Dilute sulfuric acid cyclic utilization system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120130322.3U CN215626802U (en) | 2021-01-18 | 2021-01-18 | Dilute sulfuric acid cyclic utilization system |
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| CN215626802U true CN215626802U (en) | 2022-01-25 |
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| CN202120130322.3U Active CN215626802U (en) | 2021-01-18 | 2021-01-18 | Dilute sulfuric acid cyclic utilization system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115350569A (en) * | 2022-08-31 | 2022-11-18 | 江西洪安化工有限公司 | Air purification system |
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2021
- 2021-01-18 CN CN202120130322.3U patent/CN215626802U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115350569A (en) * | 2022-08-31 | 2022-11-18 | 江西洪安化工有限公司 | Air purification system |
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