CN212396322U - Ammonia water absorption tower control analysis system - Google Patents
Ammonia water absorption tower control analysis system Download PDFInfo
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- CN212396322U CN212396322U CN202021718828.8U CN202021718828U CN212396322U CN 212396322 U CN212396322 U CN 212396322U CN 202021718828 U CN202021718828 U CN 202021718828U CN 212396322 U CN212396322 U CN 212396322U
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Abstract
The utility model relates to an aqueous ammonia absorption tower control analysis system, including aqueous ammonia absorption tower and pipeline, each valve, detecting instrument and control system, its characterized in that, programmable logic controller, analytic system and control execution system, programmable logic controller links to each other with each valve and detecting instrument electrical property, and analytic system and control execution system link to each other with programmable logic controller electrical property. The analysis system is used for calculating and analyzing the liquid level of the ammonia water and the density of the ammonia water in the ammonia water absorption tower in real time, and then the control execution system and the programmable logic controller are used for carrying out comprehensive automatic control on each pipeline valve, so that the comprehensive control of the ammonia water absorption tower is realized, and the recovery quality of the ammonia water is improved.
Description
Technical Field
The utility model belongs to the technical field of industrial computer real-time control, concretely relates to aqueous ammonia absorption tower control analytic system.
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 on-site ammonia water absorption tower production control 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 in a tower kettle structure, the middle and upper parts in the tower are ammonia gas and circulating ammonia water contact dissolving areas, and the lower kettle of the tower is an ammonia water storage area. The water inlet open-close 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 the outlet of the circulating pipeline at the bottom of the ammonia water absorption tower and used for pumping the ammonia water at the bottom of the tower to the top of the tower, and one of the two circulating water pumps works and is reserved. And 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 used for controlling the on-off of recycled ammonia water. The ammonia water level meter and the ammonia water density meter are positioned at the bottom in the ammonia water absorption tower and are respectively used for measuring the ammonia water level and the ammonia water density in the kettle.
The control core of aqueous ammonia absorption tower is the control to aqueous ammonia concentration and aqueous ammonia liquid level in the tower, because at different production stages, aqueous ammonia concentration and aqueous ammonia liquid level have different expression forms, through the analysis and judgment to aqueous ammonia concentration and aqueous ammonia liquid level change, combines the production experience, just can confirm suitable control mode. Traditional aqueous ammonia absorption tower integrated control adopts artifical mode, and this kind of artifical control mode inefficiency, reaction lag judge the error even, and it is unstable often to appear retrieving aqueous ammonia concentration, and the phenomenon that aqueous ammonia liquid level is too low in the tower leads to follow-up production to be influenced, and the aqueous ammonia recovery quality is unqualified.
Disclosure of Invention
To the above-mentioned problem that exists among the prior art, the utility model aims at providing an aqueous ammonia absorption tower control analytic system detects and analysis through the signal to aqueous ammonia density and aqueous ammonia liquid level in the aqueous ammonia absorption tower and judges to send the analytic result with the instruction form for control execution system, realized the integrated control of aqueous ammonia absorption tower.
The utility model aims at realizing through the following technical scheme:
the utility model discloses an aqueous ammonia absorption tower control analysis system, including aqueous ammonia absorption tower, ammonia air inlet pipeline, water intake pipe, the valve of intaking and aqueous ammonia recovery pipeline, recovery valve, aqueous ammonia collection tank and control system, a serial communication port, ammonia air inlet pipeline set up at the middle part of aqueous ammonia absorption tower, 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 of circulation pipeline and middle section 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 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, an analysis system and a control execution system, wherein the analysis system comprises a data preprocessing unit, a production instruction analysis unit and an alarm instruction analysis unit; the input end of the programmable logic controller is respectively connected with the ammonia water level meter and the ammonia water densimeter, the output end of the programmable logic controller is connected with the input end of the data preprocessing unit, the output end of the data preprocessing unit is respectively connected with the input ends of the production instruction analyzing unit and the alarm instruction analyzing unit, the output ends of the production instruction analyzing unit and the alarm instruction analyzing unit are respectively connected with the input end of the control executing system, the output end of the control executing system is connected with the input end of the programmable logic controller, and the output end of the programmable logic controller is electrically connected with the water inlet on-off valve, the circulating water pump, the circulating on-off valve and the recycling on-off valve.
The analysis system is used for calculating and analyzing the ammonia water density and the ammonia water liquid level signals in the ammonia water absorption tower, then sending the production instruction and the alarm instruction to the control execution system, the control execution system is used for receiving the production instruction and the alarm instruction sent by the production instruction analysis unit and the alarm instruction analysis unit, then sending the production instruction and the alarm instruction to the programmable logic controller, and the programmable logic controller executes the control flow according to the production instruction and the alarm instruction.
Compared with the prior art, the utility model has the advantages that:
because the utility model discloses a control system has adopted intelligent control system, holds real-time detection, analysis of aqueous ammonia liquid level and aqueous ammonia density in to aqueous ammonia absorption tower through analytic system, through control
The line system and the programmable logic controller carry out comprehensive automatic control on each pipeline valve, thereby realizing the comprehensive control of the ammonia water absorption tower and improving the recovery quality of the ammonia water.
Drawings
FIG. 1 is a schematic view of a control and analysis system of an ammonia water absorption tower 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 accompanying drawings and detailed description of the invention.
As shown in fig. 1 and fig. 2, the ammonia water absorption tower control analysis system of the present invention 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 collection 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 circulation pipeline 5 is arranged on the side of the ammonia water absorption tower 1, one end of the circulation 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 circulation pipeline 5 is divided into a lower section, a middle section and an upper section, a circulation water pump 6 is arranged between the lower section and the middle section of the circulation pipeline 5, a circulation open/close valve 7 is arranged on the upper section of the circulation pipeline 5, an ammonia water level meter, 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, the other end is communicated with the ammonia water collecting tank 10,
the control system is an intelligent control system and comprises a programmable logic controller, an analysis system and a control execution system, wherein the analysis system comprises a data preprocessing unit, a production instruction analysis unit and an alarm instruction analysis unit; the input end of the programmable logic controller is respectively connected with the ammonia water level meter 11 and the ammonia water densimeter 12, the output end of the programmable logic controller is connected with the input end of the data preprocessing unit, the output end of the data preprocessing unit is respectively connected with the input ends of the production instruction analyzing unit and the alarm instruction analyzing unit, the output ends of the production instruction analyzing unit and the alarm instruction analyzing unit are respectively connected with the input end of the control execution system, the output end of the control execution system is connected with the input end of the programmable logic controller, and the output end of the programmable logic controller is electrically connected with the water inlet on-off valve 4, the circulating water pump 6, the circulating on-off valve 7 and the recovery on-off valve 9.
The utility model adopts the ammonia water absorption tower control analysis system which is used for calculating and analyzing the ammonia water density and the ammonia water liquid level signal in the ammonia water absorption tower, then sending the production instruction and the alarm instruction to the control execution system, the data preprocessing unit of the analysis system carries out filtering treatment to the collected ammonia water density and the ammonia water liquid level signal, calculates the ammonia water density filtering value and the ammonia water liquid level filtering value, and converts the ammonia water density into the ammonia water concentration,
1) in the cyclic absorption control stage, the liquid level of ammonia water in the tower is kept stable, the concentration of the ammonia water in the tower is kept to slowly rise, and otherwise, a cyclic absorption alarm instruction is sent;
2) in the ammonia water recovery control stage, the liquid level of ammonia water in the tower is required to be continuously reduced, the concentration of ammonia water in the tower is required to be kept stable, and otherwise, an ammonia water recovery alarm instruction is sent;
3) in the stage of controlling the fresh water supply, the liquid level of the ammonia water in the tower should continuously rise, the concentration of the ammonia water in the tower should slowly fall, otherwise, a fresh water supply alarm instruction is sent;
the control execution system is used for receiving the production instruction and the alarm instruction sent by the production instruction analysis unit and the alarm instruction analysis unit, then sending the production instruction and the alarm instruction to the programmable logic controller, the programmable logic controller executes a control flow according to the production instruction and the alarm instruction, and the control flow executed by the production instruction comprises the following steps:
1) controlling a water supply control instruction:
the control of the fresh water supply of the ammonia water absorption tower is realized through the control of the water inlet opening-closing valve;
2) control of loop absorption control instruction:
the control of the circulating open-close valve is used for realizing the circulating absorption control of the ammonia water absorption tower;
3) controlling an ammonia water recovery control instruction:
the ammonia water recovery control of the ammonia water absorption tower is realized through the control of the recovery opening-closing valve;
control flow for executing alarm instruction
1) Firstly, checking the running condition of a circulating water pump: when the circulating water pump is abnormal, controlling the standby circulating water pump to work;
2) the performance of the relevant valve is checked next: when the valve is abnormal, an alarm is sent to inform maintenance personnel to carry out field treatment; when the valve is normally executed, initializing the program and restarting the judgment;
3) and when the abnormal condition is continuously not solved, switching to a manual mode, and informing an operator to manually control the related equipment.
Claims (2)
1. The utility model provides an aqueous ammonia absorption tower control analytic system, includes aqueous ammonia absorption tower, ammonia air inlet line, water intake pipe, inlet valve and aqueous ammonia recovery pipeline, retrieves 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 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 through tee bend and circulation pipeline on the path 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, an analysis system and a control execution system, wherein the analysis system comprises a data preprocessing unit, a production instruction analysis unit and an alarm instruction analysis unit; the input end of the programmable logic controller is respectively connected with the ammonia water level meter and the ammonia water densimeter, the output end of the programmable logic controller is connected with the input end of the data preprocessing unit, the output end of the data preprocessing unit is respectively connected with the input ends of the production instruction analyzing unit and the alarm instruction analyzing unit, the output ends of the production instruction analyzing unit and the alarm instruction analyzing unit are respectively connected with the input end of the control executing system, the output end of the control executing system is connected with the input end of the programmable logic controller, and the output end of the programmable logic controller is electrically connected with the water inlet on-off valve, the circulating water pump, the circulating on-off valve and the recycling on-off valve.
2. The ammonia water absorption tower control analysis system of claim 1, wherein the analysis system is configured to perform calculation analysis on the ammonia water density and the ammonia water level signal in the ammonia water absorption tower, and then send the production instruction and the alarm instruction to the control execution system, the control execution system is configured to receive the production instruction and the alarm instruction sent by the production instruction analysis unit and the alarm instruction analysis unit, and then send the production instruction and the alarm instruction to the programmable logic controller, and the programmable logic controller executes the control flow according to the production instruction and the alarm instruction.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111957175A (en) * | 2020-08-18 | 2020-11-20 | 中冶北方（大连）工程技术有限公司 | Ammonia water absorption tower control analysis system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111957175A (en) * | 2020-08-18 | 2020-11-20 | 中冶北方（大连）工程技术有限公司 | Ammonia water absorption tower control analysis system and method |
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