Automatic ammonia preparation device for adding ammonia water to condensed water at multiple points

Abstract

The utility model discloses an automatic ammonia preparation device for adding ammonia water into condensed water in a multi-point manner, and belongs to the technical field of industrial water treatment. Comprising an ammonia preparation unit, a multi-path adding unit and a control unit, the ammonia preparation unit comprises an ammonia water storage tank, a desalted water tank, a mixing and diluting tank, a first metering pump, a second metering pump and an online conductivity meter; the ammonia preparation unit is used for mixing ammonia water and desalted water in proportion; the multi-path adding unit comprises a main distribution pipeline and at least three parallel adding branches, each adding branch is communicated with a regulating valve, a flow meter and a static mixer, and the multi-path adding unit is used for adding mixed ammonia water to a plurality of adding points of the condensed water system; the control unit comprises a PLC (Programmable Logic Controller) and a pH sensor, the pH sensor is used for monitoring the pH value of condensed water at each feeding point, the PLC is in signal connection with the pH sensor, the online conductivity meter, the regulating valve and the flow meter, and the control unit is used for realizing dynamic flow distribution.

Description

An automatic ammonia mixing device for adding ammonia water at multiple points in condensate. Technical Field

[0001] This utility model relates to the field of industrial water treatment technology, specifically to an automatic ammonia mixing device for adding ammonia water to multiple points in condensate. Background Technology

[0002] In industrial systems such as thermal power plants and chemical plants, the pH value of condensate is closely related to the corrosion rate of equipment, and has a crucial impact on the stable operation of the system and the lifespan of the equipment. However, traditional ammonia dosing methods mainly involve single-point dosing or manual adjustment, which have revealed many drawbacks in practical applications:

[0003] Poor pH regulation stability: When using a single dosing point, the complexity and fluid characteristics of the condensate system may cause the pH value in a local area to be too high or too low. This uneven distribution of pH value will significantly increase the risk of equipment corrosion and seriously affect the service life of the equipment and the stable operation of the system.

[0004] Manual operation is prone to significant errors and poses safety hazards: When manually preparing ammonia, it is difficult to accurately control the concentration of ammonia water due to limitations in operating techniques and the precision of measuring tools. In addition, manual operation is also accompanied by safety risks such as ammonia leakage, which not only threatens the health of operators but may also lead to more serious safety accidents.

[0005] Uniformity of multi-point dosing is difficult to guarantee: With the current level of technology, it is quite challenging to achieve dynamic flow distribution at multiple dosing points. Due to the inability to accurately control the ammonia flow rate at each dosing point, the pH value in the system fluctuates greatly and is difficult to maintain within a stable and reasonable range, which in turn affects the normal operation of the entire industrial system. Summary of the Invention

[0006] The purpose of this invention is to provide an automatic ammonia dispensing device for adding ammonia water to multiple points in condensate, so as to achieve precise control of the amount of ammonia water added, stabilize the pH value of the condensate water, and prevent system corrosion.

[0007] In view of the above problems, the technical solution proposed by this utility model is as follows:

[0008] An automatic ammonia dispensing device for adding ammonia water to condensate at multiple points, comprising an ammonia dispensing unit, a multi-channel dosing unit, and a control unit;

[0009] The ammonia mixing unit includes an ammonia storage tank, a demineralized water tank, a mixing and dilution tank, a first metering pump, a second metering pump, and an online conductivity meter. The ammonia mixing unit is used to mix ammonia water and demineralized water in proportion.

[0010] The multi-channel dosing unit includes a main distribution pipeline and at least three parallel dosing branches. Each dosing branch is connected to a regulating valve, a flow meter, and a static mixer. The multi-channel dosing unit is used to add the mixed ammonia water to several dosing points in the condensate system.

[0011] The control unit includes a PLC controller and a pH sensor. The pH sensor is used to monitor the pH value of the condensate at each dosing point. The PLC controller is connected to the pH sensor, online conductivity meter, regulating valve, and flow meter via line signals. The control unit is used to realize the dynamic flow distribution of each dosing branch.

[0012] As a preferred embodiment of this utility model, the step of the control unit adjusting the dynamic flow distribution of each injection branch includes:

[0013] S1. Real-time collection of pH value of condensate at each dosing point;

[0014] S2. Calculate the deviation between the measured pH value and the target value;

[0015] S3. Dynamically adjust the opening of the regulating valve in the corresponding branch based on the PID algorithm.

[0016] As a preferred embodiment of this utility model, the control formula of the PID algorithm is as follows:

[0017]

[0018] Among them, Q i K is the flow correction for the i-th branch. p K i K d e is an adjustable parameter i Let be the original flow of the i-th branch.

[0019] As a preferred embodiment of this utility model, the ammonia storage tank is connected to the first metering pump, the demineralized water tank is connected to the second metering pump, the first metering pump and the second metering pump are connected, the second metering pump, the online conductivity meter and the mixing and dilution tank are connected, the main distribution pipeline is connected to the mixing and dilution tank, and the dosing branch is connected to the main distribution pipeline.

[0020] As a preferred embodiment of this utility model, the mixing and dilution tank is provided with a spiral guide plate, and the angle between the spiral guide plate and the horizontal plane is adjustable within the range of 30°-60°.

[0021] As a preferred embodiment of this invention, the static mixer consists of at least three sets of cross-helical blades with a blade twist angle of 180°.

[0022] As a preferred technical solution of this utility model, the control unit further includes a safety protection module, which triggers an alarm and interlocks when it detects any of the following conditions: the pH value at any dosing point is not in the range of 8.5-9.5; the ammonia leakage concentration is ≥10ppm; the pipeline pressure of the condensate system is >0.6MPa.

[0023] As a preferred embodiment of this utility model, both the first metering pump and the second metering pump are dual-head diaphragm pumps, and they form a closed-loop control with the online conductivity meter.

[0024] As a preferred embodiment of this invention, the regulating valve is a ceramic valve, and the valve core is made of zirconia ceramic material.

[0025] Compared with the prior art, the beneficial effects of this utility model are:

[0026] 1. By using the PID algorithm to achieve dynamic distribution of flow in each dosing branch, the pH adjustment accuracy of condensate can reach ±0.1, effectively avoiding excessive pH fluctuations and ensuring stable operation of the condensate system.

[0027] 2. The device is equipped with multiple safety protection measures such as nitrogen sealing and leakage alarm. Once an ammonia leakage concentration of ≥10ppm or condensate system pipeline pressure >0.6MPa is detected, the safety protection module will immediately trigger an alarm and start interlocking actions to comprehensively protect the safety of equipment and personnel.

[0028] 3. The entire ammonia preparation and dosing process is unattended, with automated control throughout. From the precise ratio of ammonia water to demineralized water, to the precise multi-point dosing of mixed ammonia water, and the real-time monitoring and adjustment of condensate pH, all are completed automatically by the system, greatly reducing the risk of manual operation and improving production efficiency.

[0029] 4. With precise flow control and uniform and stable pH adjustment, it effectively reduces pipeline corrosion caused by pH imbalance, significantly reduces pipeline corrosion rate, extends equipment service life, reduces maintenance costs, and ensures long-term stable operation of industrial systems. Attached Figure Description

[0030] Figure 1 is a schematic diagram of the automatic ammonia mixing device for adding ammonia water to multiple points in condensate according to an embodiment of the present invention.

[0031] Figure 2 is a logic block diagram of the control unit of the automatic ammonia mixing device for adding ammonia water to multiple points in condensate, as disclosed in an embodiment of this utility model.

[0032] In the diagram: 1. Ammonia storage tank; 2. Demineralized water tank; 3. First metering pump; 4. Second metering pump; 5. Online conductivity meter; 6. PLC controller; 7. Mixing and dilution tank; 8. Main distribution pipeline; 9. Control valve; 10. Flow meter; 11. Static mixer. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this application, unless otherwise stated, "multiple" means two or more.

[0035] Please refer to Figures 1-2. This utility model provides a technical solution: an automatic ammonia dispensing device for adding ammonia water to condensate at multiple points, including an ammonia dispensing unit, a multi-channel dosing unit, and a control unit;

[0036] The ammonia mixing unit includes an ammonia storage tank 1, a demineralized water tank 2, a mixing and dilution tank 7, a first metering pump 3, a second metering pump 4, and an online conductivity meter 5. The ammonia mixing unit is used to mix ammonia water and demineralized water in proportion. The ammonia storage tank 1 is used to store high-concentration ammonia water. The ammonia storage tank 1 is made of 304 stainless steel and is equipped with a liquid level sensor and a nitrogen sealing system to prevent ammonia volatilization. The demineralized water tank 2 provides dilution water and removes impurities from the water through a precision filter. The mixing and dilution tank 7 mixes ammonia water and demineralized water in the proportion required for production. The online conductivity meter 5 monitors the concentration of ammonia water after dilution in real time and feeds the data back to the control unit.

[0037] The multi-channel dosing unit includes a main distribution pipeline 8 and at least three parallel dosing branches. Each dosing branch is connected to a regulating valve 9, a flow meter 10, and a static mixer 11. The multi-channel dosing unit is used to add the mixed ammonia water to several dosing points in the condensate system. The main distribution pipeline 8 is made of DN40 stainless steel.

[0038] The control unit includes a PLC controller 6 and a pH sensor. The pH sensor is used to monitor the pH value of the condensate at each dosing point. The PLC controller 6 is connected to the pH sensor, the online conductivity meter 5, the regulating valve 9, and the flow meter 10. The control unit is used to realize the dynamic flow distribution of each dosing branch.

[0039] As one embodiment of this utility model, the step of the control unit adjusting the dynamic flow distribution of each injection branch further includes:

[0040] S1. Real-time collection of pH value of condensate at each dosing point;

[0041] S2. Calculate the deviation between the measured pH value and the target value;

[0042] S3. Dynamically adjust the opening of the regulating valve 9 of the corresponding branch based on the PID algorithm.

[0043] As one embodiment of this utility model, the control formula of the PID algorithm is further as follows:

[0044]

[0045] Among them, Q i K is the flow correction for the i-th branch. p K i K d e is an adjustable parameter i Let be the original flow of the i-th branch.

[0046] As an embodiment of this utility model, the ammonia storage tank 1 is connected to the first metering pump 3, the demineralized water tank 2 is connected to the second metering pump 4, the first metering pump 3 is connected to the second metering pump 4, the second metering pump 4, the online conductivity meter 5, and the mixing and dilution tank 7 are connected, the main distribution pipeline 8 is connected to the mixing and dilution tank 7, and the dosing branch is connected to the main distribution pipeline 8.

[0047] As an embodiment of this utility model, the mixing and dilution tank 7 is further provided with a spiral guide plate, and the angle between the spiral guide plate and the horizontal plane is adjustable within the range of 30°-60°.

[0048] As an embodiment of the present invention, the static mixer 11 is further composed of at least 3 sets of cross-helical blades with a blade twist angle of 180°.

[0049] As an embodiment of this utility model, the control unit further includes a safety protection module, which triggers an alarm and interlocks when it detects any of the following conditions: the pH value at any dosing point is not within the range of 8.5-9.5; the ammonia leakage concentration is ≥10ppm; or the pipeline pressure of the condensate system is >0.6MPa.

[0050] As an embodiment of this utility model, the first metering pump 3 and the second metering pump 4 are both double-headed diaphragm pumps, and form a closed-loop control with the online conductivity meter 5.

[0051] As one embodiment of this utility model, the regulating valve 9 is a ceramic valve, and the valve core is made of zirconia ceramic material.

[0052] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0053] Please refer to Figures 1-2. This utility model provides a technical solution: a method for an automatic ammonia mixing device that adds ammonia water to condensate at multiple points, comprising the following steps:

[0054] As an embodiment of this utility model, the high-concentration ammonia water in the ammonia water storage tank 1 is further mixed with demineralized water by a metering pump according to a set ratio and enters the mixing and dilution tank 7. At the same time, the online conductivity meter 5 monitors the concentration of the diluted ammonia water in real time. If it exceeds the range, the PLC controller 6 adjusts the flow rate of the first metering pump 3 and the second metering pump 4.

[0055] As an embodiment of this utility model, the diluted ammonia water is further transported to each dosing branch through the main distribution pipeline 8, and the PLC controller 6 dynamically adjusts the opening of the regulating valve 9 according to the pH value of the condensate at each dosing point.

[0056] As an embodiment of this utility model, further, in the above steps, if the pH of any dosing point exceeds the limit, an audible and visual alarm will be triggered and the corresponding branch will be shut down; at the same time, if the system pressure is abnormal, the pressure will be automatically released and the machine will be shut down.

[0057] In the embodiments provided in this application, it should be understood that the disclosed systems, modules, and methods can be implemented in other ways. For example, the module embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between modules or units, and may be electrical, mechanical, or other forms.

[0058] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. This application is not limited to the exact structures described above and illustrated in the accompanying drawings, and it should not be considered that the specific implementation of this application is limited to these descriptions. For those skilled in the art, various changes and modifications made without departing from the concept of this application should be considered to fall within the protection scope of this application.

Claims

1. An automatic ammonia dispensing device for adding ammonia water to condensate at multiple points, characterized in that, The system includes an ammonia mixing unit, a multi-channel dosing unit, and a control unit. The ammonia mixing unit includes an ammonia storage tank (1), a demineralized water tank (2), a mixing and dilution tank (7), a first metering pump (3), a second metering pump (4), and an online conductivity meter (5). The ammonia mixing unit is used to mix ammonia and demineralized water in proportion. The multi-channel dosing unit includes a main distribution pipeline (8) and at least three parallel dosing branches. Each dosing branch is connected to a regulating valve (9), a flow meter (10), and a static mixer (11). The multi-channel dosing unit is used to add the mixed ammonia to several dosing points in the condensate system. The control unit includes a PLC controller (6) and a pH sensor. The pH sensor is used to monitor the pH value of the condensate at each dosing point. The PLC controller (6) is connected to the pH sensor, the online conductivity meter (5), the regulating valve (9), and the flow meter (10) via line signals. The control unit is used to realize the dynamic flow distribution of each dosing branch.

2. The automatic ammonia dispensing device for adding ammonia water to condensate at multiple points according to claim 1, characterized in that, The ammonia storage tank (1) is connected to the first metering pump (3), the demineralized water tank (2) is connected to the second metering pump (4), the first metering pump (3) is connected to the second metering pump (4), the second metering pump (4), the online conductivity meter (5), and the mixing and dilution tank (7) are connected, the main distribution pipeline (8) is connected to the mixing and dilution tank (7), and the dosing branch is connected to the main distribution pipeline (8).

3. An automatic ammonia dispensing device for adding ammonia water to condensate at multiple points according to claim 1, characterized in that, The mixing and dilution tank (7) is equipped with a spiral guide plate, and the angle between the spiral guide plate and the horizontal plane is adjustable within the range of 30°-60°.

4. An automatic ammonia dispensing device for adding ammonia water to condensate at multiple points according to claim 1, characterized in that, The static mixer (11) consists of at least 3 sets of cross-helical blades with a blade twist angle of 180°.

5. An automatic ammonia dispensing device for adding ammonia water to condensate at multiple points according to claim 1, characterized in that, The control unit also includes a safety protection module, which triggers an alarm and interlocks when it detects any of the following conditions: the pH value at any dosing point is not within the range of 8.5-9.5; the ammonia leakage concentration is ≥10ppm; or the pipeline pressure of the condensate system is >0.6MPa.

6. An automatic ammonia dispensing device for adding ammonia water to condensate at multiple points according to claim 1, characterized in that, The first metering pump (3) and the second metering pump (4) are both dual-head diaphragm pumps, and form a closed-loop control with the online conductivity meter (5).

7. An automatic ammonia dispensing device for adding ammonia water to condensate at multiple points according to claim 1, characterized in that, The regulating valve (9) is a ceramic valve, and the valve core is made of zirconia ceramic material.

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