CN211478971U - DCS system-based online control device for concentration of dilute sulfuric acid in chlorine drying process - Google Patents
DCS system-based online control device for concentration of dilute sulfuric acid in chlorine drying process Download PDFInfo
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- CN211478971U CN211478971U CN202020478785.4U CN202020478785U CN211478971U CN 211478971 U CN211478971 U CN 211478971U CN 202020478785 U CN202020478785 U CN 202020478785U CN 211478971 U CN211478971 U CN 211478971U
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Abstract
The utility model relates to a dilute sulfuric acid concentration on-line control device in chlorine drying process based on DCS system. The device comprises a concentrated sulfuric acid head tank, a filler drying tower, a bubble cap drying tower, a dilute sulfuric acid circulating pump and a dilute sulfuric acid cooler, wherein a lower acid control valve and a lower acid flowmeter are arranged on a lower acid pipeline of the concentrated sulfuric acid head tank, the filler drying tower is provided with a liquid level sensor, and a sulfuric acid densimeter and an acid discharge regulating valve are arranged on an outer discharge dilute sulfuric acid pipeline; the acid discharge regulating valve is electrically connected with the liquid level sensor, the sulfuric acid densimeter is electrically connected with the lower acid control valve of the head tank and the lower acid flow meter, and the sulfuric acid densimeter, the acid discharge regulating valve, the lower acid control valve of the head tank, the lower acid flow meter and the DCS control system form a control loop. The utility model discloses based on DCS control system, through certain logical relation, will be at linear density and flow composition control circuit, in the control that becomes more meticulous, reduce concentrated sulfuric acid consumption, reduce the manual work and do the appearance frequency, energy saving and consumption reduction effectively reduces safe environmental protection risk.
Description
Technical Field
The utility model relates to a chlorine drying device of chlor-alkali trade specifically is a dilute sulphuric acid concentration on-line control device in chlorine drying process based on DCS system.
Background
At present, in a chlorine drying process, acid is discharged from a head tank through an acid valve under manual control, the acid discharge amount can be only manually adjusted, and the automation level is low; and the discharge of the dilute sulfuric acid is also manually controlled, the concentration of the discharged dilute sulfuric acid can only be analyzed manually, the reaction is delayed, and the safety and environmental protection risks exist during sampling.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a dilute sulphuric acid concentration on-line control device in chlorine drying process based on DCS system, will be in line density and flow component control circuit, in the time of the control that becomes more meticulous, reduce concentrated sulfuric acid consumption, reduce the manual work and do the appearance frequency, realize energy saving and consumption reduction, effectively reduce safe environmental protection risk.
The utility model provides a technical scheme that its technical problem adopted is:
a device for controlling the concentration of dilute sulfuric acid on line in the chlorine drying process based on a DCS (distributed control system) system comprises a concentrated sulfuric acid head tank, a filler drying tower, a bubble cap drying tower, a dilute sulfuric acid circulating pump and a dilute sulfuric acid cooler, wherein a head tank acid discharge control valve and an acid discharge flowmeter are arranged on an acid discharge pipeline between the concentrated sulfuric acid head tank and the bubble cap drying tower, the filler drying tower is provided with a liquid level sensor, and an outer discharge dilute sulfuric acid pipeline is provided with a sulfuric acid densimeter and an acid discharge regulating valve; the acid discharge regulating valve is electrically connected with the liquid level sensor, the sulfuric acid densimeter is electrically connected with the lower acid control valve of the head tank and the lower acid flow meter, and the sulfuric acid densimeter, the acid discharge regulating valve, the lower acid control valve of the head tank, the lower acid flow meter and the DCS control system form a control loop to realize cascade control.
Adopt above-mentioned technical scheme the utility model discloses, compare with prior art, beneficial effect is:
this device is based on DCS control system, through certain logical relation, will form control circuit at linear density and flow, when the control becomes more meticulous, reduces concentrated sulfuric acid consumption, reduces artifical appearance frequency, energy saving and consumption reduction and effectively reduces safe environmental protection risk.
The utility model discloses a further technical scheme is:
the filler drying tower, the dilute sulfuric acid circulating pump and the dilute sulfuric acid cooler are sequentially connected through pipelines to form an internal circulating flow of the dilute sulfuric acid tower; the filler drying tower is provided with a chlorine inlet, and dilute sulfuric acid sprayed from the top of the filler drying tower is contacted with wet chlorine through the filler in the tower to remove moisture in the chlorine.
And a liquid phase outlet pipeline of the bubble cap drying tower overflows into the filler drying tower through a liquid level difference.
The concentrated sulfuric acid head tank is connected with sulfuric acid in a sulfuric acid supply process through a pipeline, and the concentrated sulfuric acid is supplemented periodically to ensure the supply of the sulfuric acid in the concentrated sulfuric acid head tank.
Drawings
Fig. 1 is a schematic diagram of a system configuration according to an embodiment of the present invention;
in the figure: 1. a concentrated sulfuric acid head tank; 2. a filler drying tower; 3. a bubble cap drying tower; 4. a dilute sulfuric acid circulating pump; 5. a dilute sulfuric acid cooler; 6. an acid control valve under the head tank; 7. a lower acid flow meter; 8. a liquid level sensor; 9. a sulfuric acid densitometer; 10. an acid discharge regulating valve; 11. DCS control system.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Referring to fig. 1, an online control device for dilute sulfuric acid concentration in a chlorine drying process based on a DCS system is provided with a concentrated sulfuric acid head tank 1; the concentrated sulfuric acid head tank 1 is connected with the sulfuric acid output of the sulfuric acid supply process through a pipeline, and the concentrated sulfuric acid is supplemented periodically to ensure the supply of the sulfuric acid in the concentrated sulfuric acid head tank 1; concentrated sulfuric acid elevated tank 1 is connected with bubble cap drying tower 3 through acid discharge pipeline, is equipped with acid control valve 6, lower sour flowmeter 7 under the elevated tank on the acid discharge pipeline in proper order, and acid control valve 6 and lower sour flowmeter 7 constitute down sour automatic control system under the elevated tank, guarantee that bubble cap drying tower 3 advances the acid quantity and realize automatic control.
A liquid phase outlet pipeline of the bubble cap drying tower 3 is connected with the filler drying tower 2 through a liquid level difference overflow pipe, and the filler drying tower 2 is provided with a liquid level sensor 8; the filler drying tower 2, the dilute sulfuric acid circulating pump 4 and the dilute sulfuric acid cooler 5 are sequentially connected through pipelines to form an internal circulating flow of the dilute sulfuric acid tower, and redundant heat is taken away by cooling water in the dilute sulfuric acid cooler 5; the filler drying tower 2 is provided with a chlorine inlet, and dilute sulfuric acid sprayed from the top of the filler drying tower 2 is contacted with wet chlorine through the filler in the tower to remove moisture in the chlorine.
The discharged dilute sulfuric acid pipeline is connected with a dilute sulfuric acid circulating pump 4, and a sulfuric acid densimeter 9 and an acid discharge regulating valve 10 are arranged on the discharged dilute sulfuric acid pipeline 4; the acid discharge regulating valve 10 is electrically connected with the liquid level sensor 8, the sulfuric acid densimeter 9 is electrically connected with the elevated tank lower acid control valve 6 and the lower acid flow meter 7, and the sulfuric acid densimeter 9, the acid discharge regulating valve 10, the liquid level sensor 8, the elevated tank lower acid control valve 6, the lower acid flow meter 7 and the DCS control system form a control loop to realize cascade control.
The device comprises the following process flows: concentrated sulfuric acid finally reaches the bottom of the tower through five layers of tower plates in the bathing drying tower 3, and when the liquid level in the tower reaches an overflow port, the concentrated sulfuric acid enters the filler drying tower 2 through an overflow pipeline; the liquid level in the filler drying tower 2 is detected by a liquid level sensor 8, after the liquid level reaches a certain value, the liquid level is pressurized by a dilute sulfuric acid circulating pump 4, and after pressurization, the liquid level is finally discharged to a downstream process through a sulfuric acid densimeter 9, an acid discharge regulating valve 10 and an acid discharge pipeline; wet chlorine gas contacts with sulfuric acid in the filler drying tower 2 and the bubble cap drying tower 3, water is absorbed by the sulfuric acid and then is changed into dilute sulfuric acid, and the dilute sulfuric acid reaches a certain concentration and then is discharged to a downstream process through an acid discharge pipeline; the density and the flow of the discharged sulfuric acid are monitored on line by a sulfuric acid densimeter 9, and the discharged dilute sulfuric acid flow is mainly controlled by an acid discharge regulating valve 10; the sulfuric acid density detection value of the sulfuric acid densimeter 9 is used as a set value of the acid control valve 6 under the head tank according to a certain proportionality coefficient; the DCS control system 11 calculates and analyzes the detection data of the sulfuric acid densimeter 9, the head tank lower acid control valve 6 and the lower acid flowmeter 7, and forms a control loop by the online density and the flow rate to realize remote cascade control. And the concentrated sulfuric acid consumption is reduced while fine control is realized, the manual sampling frequency is reduced, the energy is saved, the consumption is reduced, and the safety and environmental protection risks are effectively reduced.
The above description is only the specific embodiment of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present invention within the technical scope disclosed in the present invention, and all the technical solutions of the present invention should be covered within the protection scope of the present invention.
Claims (4)
1. The utility model provides a dilute sulfuric acid concentration on-line control device in chlorine drying process based on DCS system, includes concentrated sulfuric acid elevated tank, filler drying tower, bubble cap drying tower, dilute sulfuric acid circulating pump, dilute sulfuric acid cooler which characterized in that: a lower acid pipeline between the concentrated sulfuric acid head tank and the bubble cap drying tower is provided with a head tank lower acid control valve and a lower acid flowmeter, the filler drying tower is provided with a liquid level sensor, and an outer discharge dilute sulfuric acid pipeline is provided with a sulfuric acid densimeter and an acid discharge regulating valve; the acid discharge regulating valve is electrically connected with the liquid level sensor, the sulfuric acid densimeter is electrically connected with the lower acid control valve of the head tank and the lower acid flow meter, and the sulfuric acid densimeter, the acid discharge regulating valve, the lower acid control valve of the head tank, the lower acid flow meter and the DCS control system form a control loop to realize cascade control.
2. The online control device for the concentration of dilute sulfuric acid in the chlorine drying process based on the DCS of claim 1, wherein: the filler drying tower, the dilute sulfuric acid circulating pump and the dilute sulfuric acid cooler are sequentially connected through pipelines to form an internal circulating flow of the dilute sulfuric acid tower; the filler drying tower is provided with a chlorine inlet.
3. The online control device for the concentration of dilute sulfuric acid in the chlorine drying process based on the DCS of claim 1, wherein: and a liquid phase outlet pipeline of the bubble cap drying tower overflows into the filler drying tower through a liquid level difference.
4. The online control device for the concentration of dilute sulfuric acid in the chlorine drying process based on the DCS of claim 1, wherein: the concentrated sulfuric acid head tank is connected with sulfuric acid in a sulfuric acid supply process through a pipeline.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020478785.4U CN211478971U (en) | 2020-04-03 | 2020-04-03 | DCS system-based online control device for concentration of dilute sulfuric acid in chlorine drying process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020478785.4U CN211478971U (en) | 2020-04-03 | 2020-04-03 | DCS system-based online control device for concentration of dilute sulfuric acid in chlorine drying process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111240373A (en) * | 2020-04-03 | 2020-06-05 | 唐山三友氯碱有限责任公司 | DCS control system-based online control device for concentration of dilute sulfuric acid in chlorine drying process |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111240373A (en) * | 2020-04-03 | 2020-06-05 | 唐山三友氯碱有限责任公司 | DCS control system-based online control device for concentration of dilute sulfuric acid in chlorine drying process |
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