CN212396323U - Control system for cyclic absorption process of ammonia water absorption tower - Google Patents
Control system for cyclic absorption process of ammonia water absorption tower Download PDFInfo
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- CN212396323U CN212396323U CN202021718832.4U CN202021718832U CN212396323U CN 212396323 U CN212396323 U CN 212396323U CN 202021718832 U CN202021718832 U CN 202021718832U CN 212396323 U CN212396323 U CN 212396323U
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Abstract
The utility model relates to a control system of aqueous ammonia absorption tower circulation absorption process, including aqueous ammonia absorption tower and pipeline, each valve, detection instrument and control system, its characterized in that, control system include programmable logic controller, circulation absorption analysis unit, circulation absorption liquid level control unit and circulation absorption concentration control unit, programmable logic controller links to each other with each valve, detection instrument and three unit electrical property. The advantages are that: adopt the utility model discloses a control system, through real-time detection and the integrated control to aqueous ammonia density and aqueous ammonia liquid level in the aqueous ammonia absorption tower, realized the absorptive intelligent control of aqueous ammonia circulation in the aqueous ammonia absorption tower.
Description
Technical Field
The utility model relates to an industrial computer real-time control technical field, concretely relates to control system of aqueous ammonia absorption tower circulation absorption process.
Background
The flue gas pollution discharged by the traditional sintering production is serious, and the main pollutants are sulfur dioxide and nitric oxide. With the gradual strictness of the national emission standards of flue gas, a series of flue gas desulfurization and denitration projects begin to be built. One effective flue gas denitration method is to use ammonia gas as a reducing agent to reduce nitrogen oxides into nitrogen gas and water. The ammonia station system is responsible for producing ammonia, and the waste water discharged in the production process contains high-concentration ammonia nitrogen compounds, and needs to be subjected to secondary treatment processes of ammonia extraction and ammonia water absorption. The main reaction container for absorbing the ammonia water is an ammonia water absorption tower, circulating ammonia water flowing from top to bottom in the tower is contacted with ammonia gas introduced from bottom to top and dissolved, the concentration of the ammonia water is continuously increased in the circulating process, and finally the ammonia water meeting the concentration requirement is recovered. The traditional ammonia water absorption tower production system comprises an ammonia water absorption tower, a water inlet opening and closing valve, a circulating water pump, a circulating opening and closing valve, a recovery opening and closing valve, an ammonia water liquid level meter, an ammonia water densimeter and related pipelines. The ammonia water absorption tower is of a tower kettle structure, the middle upper part in the tower is an ammonia gas and circulating ammonia water contact dissolving area, and the kettle at the lower part of the tower is an ammonia water storage area. The water inlet opening and closing valve is positioned on a water inlet pipeline at the top of the ammonia water absorption tower and is used for controlling the on-off of new water entering the tower; the circulating water pump is connected with an outlet of a circulating pipeline at the bottom of the ammonia water absorption tower and is used for pumping ammonia water at the bottom of the tower to the top of the tower, and the two circulating water pumps work one by one for standby; the circulating on-off valve is positioned at the inlet of the circulating pipeline at the top of the ammonia water absorption tower and is used for controlling the on-off of the circulating ammonia water; the recycling opening and closing valve is positioned on a recycling pipeline of a circulating pipeline branch at the top of the ammonia water absorption tower and is used for controlling the on-off of recycled ammonia water; the ammonia water level meter and the ammonia water densimeter are positioned at the bottom of the ammonia water absorption tower and are respectively used for measuring the ammonia water level and the ammonia water density in the kettle.
In the ammonia water circulating absorption process of the ammonia water absorption tower production system, the control on the ammonia water liquid level and the concentration in the tower is particularly critical, and the unreasonable ammonia water liquid level height and the abnormal ammonia water concentration can cause negative influence on the ammonia water absorption process. On site, the traditional control of the ammonia water circulating absorption process adopts a manual mode, and the judgment is made according to experience through observation of workers on the liquid level and the concentration of the ammonia water in the tower. The manual control mode is not beneficial to health, and not only has backward technology, low efficiency and lagged reaction, but also is easy to have judgment errors, thereby causing economic loss.
Disclosure of Invention
To the above-mentioned problem that exists among the prior art, the utility model aims at providing a control system of aqueous ammonia absorption tower circulation absorption process, through in to the aqueous ammonia absorption tower aqueous ammonia density and aqueous ammonia liquid level real-time detection and integrated control, realized the absorptive intelligent control of aqueous ammonia circulation in the aqueous ammonia absorption tower.
The utility model aims at realizing through the following technical scheme:
the utility model discloses a control system of aqueous ammonia absorption tower circulation absorption process, including aqueous ammonia absorption tower, ammonia air inlet pipeline, water intake pipe, valve and aqueous ammonia recovery pipeline, recovery valve, aqueous ammonia holding vessel and control system of intaking, its characterized in that, ammonia air inlet pipeline set up at the middle part of aqueous ammonia absorption tower, the water intake pipe sets up at the top of aqueous ammonia absorption tower, is equipped with the circulation pipeline in the side of aqueous ammonia absorption tower, circulation pipeline one end and aqueous ammonia absorption tower bottom intercommunication, the other end and the upper portion intercommunication of aqueous ammonia absorption tower, the circulation pipeline divide into hypomere, middle section and upper segment triplex, be equipped with circulating water pump between the hypomere and the middle section of circulation pipeline the upper segment of circulation pipeline be equipped with the circulation valve the lower part of aqueous ammonia absorption tower be equipped with aqueous ammonia level gauge and aqueous ammonia densimeter, aqueous ammonia recovery pipeline one end pass through tee bend and circulation pipeline on segment and middle section intercommunication, The other end is communicated with an ammonia water collecting tank;
the control system is an intelligent control system and comprises a programmable logic controller, a circulating absorption analysis unit, a circulating absorption liquid level control unit and a circulating absorption concentration control unit; the input end of the programmable logic controller is connected with the ammonia water level meter and the ammonia water densimeter, the output end of the programmable logic controller is electrically connected with a water inlet opening and closing valve, a circulating water pump, a circulating opening and closing valve and a recycling opening and closing valve, the output end of the programmable logic controller is also connected with the input end of a circulating absorption analysis unit, the output end of the circulating absorption analysis unit is respectively connected with the input end of the circulating absorption liquid level control unit and the input end of the circulating absorption concentration control unit, and the output end of the circulating absorption liquid level control unit and the output end of the circulating absorption concentration control unit are respectively connected with the input end of the programmable logic controller.
The circulating absorption analysis unit is used for determining and dividing an ammonia water liquid level interval and an ammonia water concentration change rate interval, calculating and analyzing the states of the ammonia water liquid level and the ammonia water concentration change rate according to the interval of the detection data, and outputting a related instruction;
the circulating absorption liquid level control unit is used for sending an adjusting instruction or an abnormal condition alarm instruction to the water inlet opening and closing valve according to the liquid level state instruction output by the circulating absorption analysis unit;
and the circulating absorption concentration control unit is used for monitoring each valve in real time according to the instruction of the change rate C' (t) state of the ammonia water concentration measurement value output by the circulating absorption analysis unit and sending an adjustment instruction or an abnormal condition alarm instruction.
Compared with the prior art, the utility model has the advantages that:
because the utility model adopts the control system of the circular absorption process of the ammonia water absorption tower, the circular absorption analysis unit of the intelligent control system determines and divides the ammonia water liquid level interval and the ammonia water concentration change rate interval, and calculates and analyzes the states of the ammonia water liquid level and the ammonia water concentration change rate according to the interval of the detection data; and according to the liquid level state instruction output by the circulating absorption analysis unit, sending an adjustment instruction or an abnormal condition alarm instruction to the water inlet opening and closing valve; and the circulating absorption concentration control unit monitors each valve in real time according to the instruction of the change rate C' (t) state of the ammonia concentration measurement value output by the circulating absorption analysis unit, and sends out an adjustment instruction or an abnormal condition alarm instruction.
Compared with the prior art, the utility model has the advantages that:
the utility model discloses a to the real-time detection and the integrated control of aqueous ammonia density and aqueous ammonia liquid level in the aqueous ammonia absorption tower, realized the absorptive intelligent control of aqueous ammonia circulation in the aqueous ammonia absorption tower.
Drawings
FIG. 1 is a schematic view of a cyclic absorption system of the present invention;
fig. 2 is a block diagram of the computer software system of the present invention.
Detailed Description
For a clear, detailed and complete description of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings.
As shown in fig. 1 and fig. 2, the utility model discloses a control system for the cyclic absorption process of an ammonia water absorption tower, which comprises an ammonia water absorption tower 1, an ammonia gas inlet pipeline 2, a water inlet pipeline 3, a water inlet open/close valve 4, an ammonia water recovery pipeline 8, a recovery open/close valve 9, an ammonia water collecting tank 10 and a control system, and is characterized in that the ammonia gas inlet pipeline 2 is arranged in the middle of the ammonia water absorption tower 1, the water inlet pipeline 3 is arranged at the top of the ammonia water absorption tower 1, a circulating pipeline 5 is arranged on the side of the ammonia water absorption tower 1, one end of the circulating pipeline 5 is communicated with the bottom of the ammonia water absorption tower 1, the other end is communicated with the upper part of the ammonia water absorption tower 1, the circulating pipeline 5 is divided into a lower section, a middle section and an upper section, a circulating water pump 6 is arranged between the lower section and the middle section of the circulating pipeline 5, an ammonia water liquid level meter 11 and an ammonia water densimeter 12 are arranged at the lower part of the ammonia water absorption tower 1, one end of the ammonia water recovery pipeline 8 is communicated with the upper section and the middle section of the circulating pipeline 5 through a tee joint, and the other end is communicated with an ammonia water collecting tank 10;
the control system is an intelligent control system and comprises a programmable logic controller, a circulating absorption analysis unit, a circulating absorption liquid level control unit and a circulating absorption concentration control unit; programmable logic controller's input be connected with aqueous ammonia level gauge 11 and aqueous ammonia densimeter 12, programmable logic controller's output with the valve 4 of opening and closing of intaking, circulating water pump 6, circulation on-off valve 7 and retrieve on-off valve 9 electrical property and link to each other, programmable logic controller output still with circulation absorption analysis unit input be connected, circulation absorption analysis unit output respectively with circulation absorption liquid level control unit input with circulation absorption concentration control unit input connect, circulation absorption liquid level control unit output and circulation absorption concentration control unit output still are connected with programmable logic controller input respectively.
By adopting the control system of the ammonia water absorption tower circulation absorption process, the circulation absorption analysis unit is used for determining and dividing the ammonia water liquid level interval and the ammonia water concentration change rate interval, calculating and analyzing the states of the ammonia water liquid level and the ammonia water concentration change rate according to the interval of the detection data, and outputting the related instructions;
the circulating absorption analysis unit is used for dividing an ammonia water liquid level interval and an ammonia water concentration change rate interval, and analyzing the acquired ammonia water liquid level data and the calculated ammonia water concentration change rate according to the respective intervals;
the circulating absorption liquid level control unit is used for sending an adjusting instruction or an abnormal condition alarm instruction to the water inlet opening and closing valve according to the liquid level state instruction output by the circulating absorption analysis unit;
the circulation absorption liquid level control unit makes corresponding control strategy adjustment according to the analysis of the circulation absorption analysis unit on the ammonia water liquid level and the interval where the ammonia water liquid level measurement value L is located, and the specific process is as follows:
1) when the ammonia water liquid level measured value L is in a T1 interval, no adjustment control is needed;
2) when the ammonia water liquid level measured value L is in the interval T2, the water inlet opening and closing valve 4 is automatically closed immediately;
3) when the ammonia water liquid level measured value L is in a T3 interval, an alarm is given out on the premise of keeping the water inlet opening and closing valve 4 closed, maintenance personnel is informed to leak a part of ammonia water, and the alarm is released when the liquid level is separated from a T3 interval and enters a T2 interval;
4) when the measured value L of the liquid level of the ammonia water is in a T4 interval, opening a water inlet opening and closing valve 4 at intervals according to a pulse time period to slowly replenish water, and stopping replenishing water until the liquid level is separated from the T4 interval and enters a T1 interval;
5) when the ammonia water liquid level measured value L is in a T5 interval, keeping the water inlet opening and closing valve 4 in a continuous opening state to carry out rapid water replenishing until the liquid level is separated from a T5 interval and enters a T4 interval, and returning to a T4 interval;
and the circulating absorption concentration control unit is used for monitoring each valve in real time according to the instruction of the change rate C' (t) state of the ammonia water concentration measurement value output by the circulating absorption analysis unit and sending an adjustment instruction or an abnormal condition alarm instruction.
The circulating absorption concentration control unit makes corresponding control strategy adjustment according to the analysis of the circulating absorption analysis unit on the ammonia water concentration change rate and the interval where the ammonia water concentration measurement value change rate C' (t) is located, and the specific process is as follows:
1) when the change rate C' (t) of the ammonia concentration measurement value is in an M1 interval, no adjustment control is needed;
2) when the change rate C' (t) of the ammonia concentration measurement value is in the M2 interval, sequentially checking the running state of the circulating water pump 6, the flow of introduced ammonia, the opening state of a circulating on-off valve 7, the ammonia liquid level, the opening state of a water inlet on-off valve 4 and the opening state of a recovery on-off valve 9 according to different degrees of influence; when a certain link is detected to be abnormal, corresponding alarm information is sent out to guide maintenance personnel to investigate abnormal points;
3) when the change rate C' (t) of the ammonia concentration measurement value is in the M3 interval, sequentially checking the ammonia water liquid level, the opening state of the recovery on-off valve 9, the running state of the circulating water pump 6, the ammonia gas flow, the opening state of the water inlet on-off valve 4 and the opening state of the circulating on-off valve 7 according to different degrees of influence; and when the abnormality of a certain link is detected, corresponding alarm information is sent out to guide maintenance personnel to investigate the abnormal points.
The specific implementation of the present invention can be changed and modified in various ways within the scope defined by the claims, and any person should fall within the protection scope of the present invention based on all other embodiments implemented by the present invention without any creative work.
Claims (1)
1. The utility model provides a control system of aqueous ammonia absorption tower circulation absorption process, includes aqueous ammonia absorption tower, ammonia air inlet line, water intake pipe, inlet opening and closing valve and aqueous ammonia recovery pipeline, retrieves opening and closing valve, aqueous ammonia collection tank and control system, its characterized in that, ammonia air inlet line set up the middle part at the aqueous ammonia absorption tower, the water intake pipe sets up the top at the aqueous ammonia absorption tower, is equipped with the circulation pipeline in the side of aqueous ammonia absorption tower, circulation pipeline one end and aqueous ammonia absorption tower bottom intercommunication, the other end and the upper portion intercommunication of aqueous ammonia absorption tower, the circulation pipeline divide into hypomere, middle section and upper segment triplex, be equipped with circulating water pump between the hypomere and the middle section of circulation pipeline, the upper segment of circulation pipeline be equipped with the circulation, the lower part of aqueous ammonia absorption tower be equipped with aqueous ammonia level gauge and aqueous ammonia densimeter, aqueous ammonia recovery pipeline one end through tee bend and circulation pipeline upper segment and middle section intercommunication, The other end is communicated with an ammonia water collecting tank;
the control system is an intelligent control system and comprises a programmable logic controller, a circulating absorption analysis unit, a circulating absorption liquid level control unit and a circulating absorption concentration control unit; the input end of the programmable logic controller is connected with the ammonia water level meter and the ammonia water densimeter, the output end of the programmable logic controller is electrically connected with a water inlet opening and closing valve, a circulating water pump, a circulating opening and closing valve and a recycling opening and closing valve, the output end of the programmable logic controller is also connected with the input end of a circulating absorption analysis unit, the output end of the circulating absorption analysis unit is respectively connected with the input end of the circulating absorption liquid level control unit and the input end of the circulating absorption concentration control unit, and the output end of the circulating absorption liquid level control unit and the output end of the circulating absorption concentration control unit are respectively connected with the input end of the programmable logic controller.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021718832.4U CN212396323U (en) | 2020-08-18 | 2020-08-18 | Control system for cyclic absorption process of ammonia water absorption tower |
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| CN202021718832.4U CN212396323U (en) | 2020-08-18 | 2020-08-18 | Control system for cyclic absorption process of ammonia water absorption tower |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111841259A (en) * | 2020-08-18 | 2020-10-30 | 中冶北方（大连）工程技术有限公司 | Control system and method for cyclic absorption process of ammonia water absorption tower |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111841259A (en) * | 2020-08-18 | 2020-10-30 | 中冶北方（大连）工程技术有限公司 | Control system and method for cyclic absorption process of ammonia water absorption tower |
| CN111841259B (en) * | 2020-08-18 | 2024-03-08 | 中冶北方（大连）工程技术有限公司 | Control system and method for circulating absorption process of ammonia absorption tower |
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