CN217202093U - Follow-up control system for preparing ammonia water from liquid ammonia - Google Patents
Follow-up control system for preparing ammonia water from liquid ammonia Download PDFInfo
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- CN217202093U CN217202093U CN202221229444.9U CN202221229444U CN217202093U CN 217202093 U CN217202093 U CN 217202093U CN 202221229444 U CN202221229444 U CN 202221229444U CN 217202093 U CN217202093 U CN 217202093U
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Abstract
The utility model discloses a follow-up control system of liquid ammonia preparation aqueous ammonia belongs to chemical machinery technical field, including the preparation tower, the liquid ammonia pipeline, desalting water pipeline and PLC controller, the output of liquid ammonia pipeline and the output of desalting water pipeline link to each other with the preparation tower respectively, are equipped with demineralized water flow meter and desalting water governing valve on the desalting water pipeline, are equipped with liquid ammonia trip valve and liquid ammonia governing valve on the liquid ammonia pipeline, and the demineralized water flow meter, desalting water governing valve, liquid ammonia trip valve and liquid ammonia governing valve link to each other with the PLC controller respectively. The utility model monitors the flow of desalted water in real time through the desalted water flow meter and sends the flow information to the PLC controller, and the PLC controller realizes the control of the desalted water regulating valve of the preparation tower through controlling and regulating the desalted water regulating valve according to the real-time ammonia water concentration; meanwhile, the PLC carries out follow-up flow regulation on the ammonia water concentration through the liquid ammonia regulating valve, so that the ammonia water concentration is accurately controlled.
Description
Technical Field
The utility model relates to a chemical machinery technical field especially relates to a follow-up control system of liquid ammonia preparation aqueous ammonia.
Background
In an ammonia water preparation system in industrial production, the change of the flow of liquid ammonia caused by the change of the yield of ammonia water of users and other factors can cause great influence on the industrial production, and even cause production influence or accidents due to the control disorder of the liquid ammonia and the occurrence of overpressure or overpressure. Therefore, higher requirements are put on the flow control of the liquid ammonia. The existing liquid ammonia control system has poor control precision of liquid ammonia flow and poor adaptability to load fluctuation due to the limitation of structure and principle.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a follow-up control system of liquid ammonia preparation aqueous ammonia, through the flow of the desalinized water of desalinized water flowmeter real-time supervision and send this flow information to the PLC controller, the PLC controller realizes the desalinized water governing valve control of preparation tower through the control adjustment desalinized water governing valve according to real-time aqueous ammonia concentration; meanwhile, the PLC carries out follow-up flow regulation on the ammonia water concentration through the liquid ammonia regulating valve, so that the ammonia water concentration is accurately controlled, and the technical problems that the control precision of the liquid ammonia flow is poor and the adaptability to load fluctuation is poor due to the limitation of the structure and the principle of the existing liquid ammonia control system in the background technology are solved.
In order to achieve the above object, the utility model adopts the following technical scheme: the utility model provides a follow-up control system of liquid ammonia preparation aqueous ammonia, including the preparation tower, the liquid ammonia pipeline, desalted water pipeline and PLC controller, the output of liquid ammonia pipeline and the output of desalted water pipeline link to each other with the preparation tower respectively, be equipped with demineralized water flow meter and desalted water governing valve on the desalted water pipeline, be equipped with liquid ammonia trip valve and liquid ammonia governing valve on the liquid ammonia pipeline, the demineralized water flow meter, desalted water governing valve, liquid ammonia trip valve and liquid ammonia governing valve link to each other with the PLC controller respectively.
Preferably, still be equipped with liquid ammonia import flange ball valve, liquid ammonia filter on the liquid ammonia pipeline in order to and liquid ammonia flange stop valve, and liquid ammonia trip valve and liquid ammonia governing valve are located between liquid ammonia filter and the liquid ammonia flange stop valve.
Preferably, the desalted water pipeline is sequentially provided with a desalted water inlet flange ball valve, a desalted water filter and a desalted water flange stop valve, and the desalted water flow meter and the desalted water regulating valve are positioned between the desalted water filter and the desalted water flange stop valve.
Preferably, a thermometer and a pressure gauge are arranged on the preparation tower, the thermometer is connected with a temperature transmitter, the pressure gauge is connected with a pressure transmitter, and the temperature transmitter and the pressure transmitter are respectively connected with the PLC.
Preferably, the device further comprises a compressed air pipeline, and the output end of the compressed air pipeline is connected with the liquid ammonia shut-off valve.
Preferably, the output of the liquid ammonia conduit is located below the output of the demineralised water conduit.
Preferably, a material outlet is arranged on the preparation tower.
The utility model has the advantages that:
(1) in the system structure, the control of the desalted water regulating valve of the preparation tower is realized through a single-loop closed-loop negative feedback constant value control system of the desalted water flow; meanwhile, a liquid ammonia regulating valve is controlled to carry out follow-up flow regulation (proportion of liquid ammonia and desalted water) according to the concentration of ammonia water, so that the flow regulation device adapts to the fluctuation of pressure and flow of various loads, and controls the liquid ammonia inlet flow in time according to the change of the use amount of a user to control the liquid ammonia flow within a required range.
(2) In the system structure, the control system is provided with a set of interlocking control system, namely, if the temperature low limit alarm and the pressure high limit alarm of the preparation tower body occur, the liquid ammonia is cut off through a liquid ammonia cut-off valve arranged on a liquid ammonia inlet pipeline, so as to prevent the liquid passing phenomenon, and ensure the safe and reliable operation of the preparation tower.
Drawings
Fig. 1 is an overall schematic view of the present invention.
In the figure: 1. the system comprises a preparation tower, 2, a liquid ammonia pipeline, 3, a desalted water pipeline, 4, a compressed air pipeline, 11, a thermometer, 12, a pressure gauge, 21, a liquid ammonia inlet flange ball valve, 22, a liquid ammonia filter, 23, a liquid ammonia flange stop valve, 34, a desalted water inlet flange ball valve, 35, a desalted water filter, 36, a desalted water flange stop valve, 101, a temperature transmitter, 201, a liquid ammonia stop valve, 202, a liquid ammonia regulating valve, 301, a desalted water flow meter, 302, a desalted water regulating valve, 401 and a pressure transmitter.
Detailed Description
The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.
In order to filter the impurity in getting into liquid ammonia pipeline 2 in the liquid ammonia, the utility model discloses still be equipped with liquid ammonia import flange ball valve 21 on liquid ammonia pipeline 2 in order, liquid ammonia filter 22 to and liquid ammonia flange stop valve 23, and liquid ammonia stop valve 201 is located between liquid ammonia filter 22 and liquid ammonia flange stop valve 23 with liquid ammonia governing valve 202.
In order to filter the impurity that gets into in the desalination water pipeline 3 in the desalination water, the utility model discloses be equipped with desalination water inlet flange ball valve 34 on desalination water pipeline 3 in proper order, desalination water filter 35 and desalination water flange stop valve 36, and desalination water flowmeter 301 and desalination water governing valve 302 are located between desalination water filter 35 and desalination water flange stop valve 36.
For the opening and closing of accurate control liquid ammonia trip valve 201, the utility model discloses still include compressed air pipeline 4, compressed air pipeline 4's output links to each other with liquid ammonia trip valve 201.
Be convenient for the intensive mixing of liquid ammonia and demineralized water, the utility model discloses liquid ammonia pipeline 2's output is located the below of the output of demineralized water pipeline 3.
In order to facilitate discharging, the utility model discloses be equipped with the material export on the preparation tower 1.
The utility model discloses a theory of operation: firstly, connecting all parts according to the connection structure of the system, then synchronously starting a liquid ammonia pipeline 2 and a desalted water pipeline 3 to enable liquid ammonia and desalted water to enter a preparation tower 1, and then realizing the control of a desalted water adjusting valve of the preparation tower through a single-loop closed-loop negative feedback constant value control system of desalted water flow according to the preset or actually required liquid ammonia concentration, namely the proportion of the liquid ammonia and the desalted water; meanwhile, a liquid ammonia regulating valve controls follow-up flow regulation (proportion of liquid ammonia and desalted water) according to ammonia water concentration, liquid ammonia inlet amount is controlled timely, liquid ammonia flow is controlled within a required range, finally, the temperature in the preparation tower 1 is monitored in real time through a thermometer 11, when the pressure is too high, a pressure transmitter 401 sends a signal to a PLC (programmable logic controller), or when the temperature is low, a temperature transmitter 101 sends a signal to the PLC, namely, when only temperature low limit alarm and pressure high limit alarm occur, the PLC automatically closes a liquid ammonia cut-off valve by controlling an electromagnetic valve arranged on a gas path between pneumatic actuating mechanisms, so that the liquid passing phenomenon is prevented, and safe and reliable operation of the preparation tower is ensured.
The utility model discloses what do not specifically explain all adopts prior art, like the principle and so on of the material of pipeline, PLC controller, each part of PLC controller control.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (7)
1. The utility model provides a follow-up control system of liquid ammonia preparation aqueous ammonia which characterized in that: including preparation tower (1), liquid ammonia pipeline (2), desalination pipeline (3) and PLC controller, the output of liquid ammonia pipeline (2) and the output of desalination pipeline (3) link to each other with preparation tower (1) respectively, be equipped with demineralized water flow meter (301) and desalination governing valve (302) on desalination pipeline (3), be equipped with liquid ammonia trip valve (201) and liquid ammonia governing valve (202) on liquid ammonia pipeline (2), demineralized water flow meter (301), desalination governing valve (302), liquid ammonia trip valve (201) link to each other with the PLC controller respectively with liquid ammonia governing valve (202).
2. The follow-up control system for preparing ammonia water from liquid ammonia according to claim 1, characterized in that: still be equipped with liquid ammonia import flange ball valve (21), liquid ammonia filter (22) on liquid ammonia pipeline (2) in order to and liquid ammonia flange stop valve (23), and liquid ammonia trip valve (201) and liquid ammonia governing valve (202) are located between liquid ammonia filter (22) and liquid ammonia flange stop valve (23).
3. The follow-up control system for preparing ammonia water from liquid ammonia according to claim 1, characterized in that: the desalted water pipeline (3) is sequentially provided with a desalted water inlet flange ball valve (34), a desalted water filter (35) and a desalted water flange stop valve (36), and the desalted water flow meter (301) and the desalted water regulating valve (302) are positioned between the desalted water filter (35) and the desalted water flange stop valve (36).
4. The follow-up control system for preparing ammonia water from liquid ammonia according to claim 1, characterized in that: be equipped with thermometer (11) and manometer (12) on preparation tower (1), thermometer (11) are connected with temperature transmitter (101), and manometer (12) are connected pressure transmitter (401), and temperature transmitter (101) and pressure transmitter (401) link to each other with the PLC controller respectively.
5. The follow-up control system for preparing ammonia water from liquid ammonia according to claim 1, characterized in that: still include compressed air pipeline (4), the output of compressed air pipeline (4) links to each other with liquid ammonia trip valve (201).
6. The follow-up control system for preparing ammonia water from liquid ammonia according to claim 1, characterized in that: the output end of the liquid ammonia pipeline (2) is positioned below the output end of the desalted water pipeline (3).
7. The follow-up control system for preparing ammonia water from liquid ammonia according to claim 1, characterized in that: a material outlet is arranged on the preparation tower (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221229444.9U CN217202093U (en) | 2022-05-19 | 2022-05-19 | Follow-up control system for preparing ammonia water from liquid ammonia |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221229444.9U CN217202093U (en) | 2022-05-19 | 2022-05-19 | Follow-up control system for preparing ammonia water from liquid ammonia |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217202093U true CN217202093U (en) | 2022-08-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221229444.9U Active CN217202093U (en) | 2022-05-19 | 2022-05-19 | Follow-up control system for preparing ammonia water from liquid ammonia |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217202093U (en) |
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2022
- 2022-05-19 CN CN202221229444.9U patent/CN217202093U/en active Active
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