Diluted ammonia water concentration analysis system
Through the potential titration method and control system of the dilute ammonia water concentration analysis system, the problem of changes in ammonia content in urea device production is solved, and the stable control of dilute ammonia water concentration and the accuracy of process production is achieved.
Patent Information
- Application Number
- CN202420789353.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-16
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-04-16
AI Technical Summary
In the dilute ammonia water produced by the urea device, the ammonia content is constantly changing and irregular. The existing dilute ammonia water density monitoring cannot accurately determine the ammonia concentration, resulting in the inability to effectively control the ammonia content within the required concentration range, affecting process production.
A dilute ammonia water concentration analysis system was designed, and the ammonia content was measured by a potential titrator using a potential titrator, and the amount of dilute water was adjusted through the control system to ensure the stable control of the dilute ammonia water concentration. The system includes a storage tank, a potential titrator, The sampling pump and control system use pneumatic drive valves and circulation pumps to achieve sample sharing and flow regulation.
Accurate determination of ammonia content and stable control of dilute ammonia water concentration are achieved, ensuring that the ammonia content in the product is within the range of 20.7%±0.5%, avoiding sample losses, and stabilizing the flow rate and concentration during the configuration process through interlocking control.
Smart Images
Figure CN222280571U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of dilute ammonia water industry, and in particular relates to a dilute ammonia water concentration analysis system. Background Art
[0002] According to the HG∕T 5353-2018 Industrial Ammonia Water standard, dilute ammonia water is used as an environmentally friendly treatment liquid for desulfurization and denitrification. When used, the ammonia concentration is required to be ≥20.0%. The ammonia content is determined by acid-base titration, which indicates the endpoint through the indicator and calculates the ammonia content in the sample based on the volume of hydrochloric acid consumed in the titration. When using dilute ammonia water produced by a urea device, a higher concentration of stock solution is usually selected for dilution and configuration. In addition to ammonia, there are also a small amount of other impurities such as carbon dioxide and urea in the solution. The ammonia content in the solution changes continuously and irregularly. During the continuous dilution and configuration process, frequent analysis is required to determine the concentration of the configured dilute ammonia water, so as to guide the process adjustment and ensure that the ammonia content in the product is controlled within the required concentration range. The laboratory monitored the sample density during the continuous configuration process and found that there was no clear correlation between density and content. The ammonia content changed by more than 1% at the same density. The system that uses conventional monitoring of dilute ammonia water density to convert ammonia concentration cannot be used for the determination of ammonia content in the production process of this process. Utility Model Content
[0003] The utility model aims to adjust the amount of dilution water added according to the ammonia content to achieve stable control of the concentration of dilute ammonia water, and proposes a dilute ammonia water concentration analysis system.
[0004] The dilute ammonia concentration analysis system is connected to the raw ammonia tank, and is characterized in that it includes a storage tank, a potentiometric titrator, a sampling pump and a control system. The raw ammonia tank is connected to the configuration point through a supply pipeline, and then connected to the storage tank through a delivery pipeline. The configuration point is also connected to a desalted water pipeline, and a flow regulating valve is set on the desalted water pipeline. A circulation pipeline is connected to the storage tank, and a circulation pump is set on the circulation pipeline. The outlet of the circulation pump is connected to the upper part of the storage tank, and the outlet of the circulation pump is also connected to a sampling pipeline connected to the sampling pump, and a third valve is set on the sampling pipeline; the delivery pipeline is also connected to a The pipeline is connected to the sampling pump, and a second valve is arranged on the pipeline; a pipeline is also connected to the sampling pump from the raw ammonia water supply pipeline, and a first valve is arranged on the pipeline; a circulation pipeline is also connected to the sampling pump from the top of the storage tank, and the potentiometric titrator is connected to the circulation pipeline through its sampling needle; the control system is respectively connected to the potentiometric titrator, the first valve, the second valve, the third valve and the flow regulating valve by telecommunication; the sampling pump is connected to three sampling points at the same time, and through the control of the first valve, the second valve and the third valve, the samples at the three points can be analyzed by sharing a potentiometric titrator.
[0005] Furthermore, the control system version is Honeywell pks r500.
[0006] Furthermore, the first valve, the second valve and the third valve are all pneumatically driven valves.
[0007] Furthermore, the circulation pump is also connected to a pipeline to directly connect to the storage tank.
[0008] Furthermore, a liquid level meter is disposed in the storage tank.
[0009] The beneficial effect of the utility model is that the system uses potentiometric titration to determine the ammonia content, and adjusts the amount of dilution water added according to the ammonia content to achieve stable control of the concentration of dilute ammonia water. The sample at the outlet of the sampling pump is directly connected to the storage tank to achieve loss-free recovery of the sample. The potentiometric titrator uses a standard hydrochloric acid solution for titration to calculate the ammonia content in the stock solution, and controls the amount of desalted water added through the control system to keep the concentration of the configured dilute ammonia water at 20.7%. The change in the two amounts does not exceed 0.5%. By connecting multiple valves through the control system, three samples can be measured separately on the same instrument. The delivery flow rate during the dilute ammonia water configuration process is stable, and the amount of desalted water added later can be accurately calculated based on the ammonia content. The amount of desalted water added is controlled by interlocking to achieve stable control of the product configuration process. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 This is a connection diagram for the dilute ammonia concentration analysis system.
[0011] Among them: 1-raw ammonia water tank, 2-storage tank, 3-potentiometric titrator, 4-control system, 5-supply pipeline, 6-configuration point, 7-transport pipe, 8-desalted water pipeline, 9-flow regulating valve, 10-sampling pipeline, 11-circulation pump, 12-first valve, 13-sampling pump, 14-second valve, 15-third valve, 16-sampling needle, 17-circulation pipeline, 18-circulation pipeline. DETAILED DESCRIPTION
[0012] Embodiment 1: A dilute ammonia concentration analysis system is connected to a raw ammonia tank 1. The system includes a storage tank 2, a potentiometric titrator 3 and a control system 4. The raw ammonia tank 1 is connected to a configuration point 6 by a supply pipeline 5, and then connected to the storage tank 2 by the configuration point 6 through a delivery pipeline 7. The configuration point 6 is also connected to a desalted water pipeline 8, and a flow regulating valve 9 is arranged on the desalted water pipeline 8. A circulation pipeline 18 is connected to the storage tank 2, and a circulation pump 11 is arranged on the circulation pipeline 18. The outlet of the circulation pump returns to the storage tank through the circulation pipeline 18. A sampling pipeline 10 is also connected to the sampling pump 13 at the outlet of the circulation pump, and a third valve 15 is arranged on the pipeline; a pipeline is also connected to the sampling pump 13 on the delivery pipeline 7, and a second valve 14 is arranged on the pipeline; a pipeline is also connected to the sampling pump 13 on the supply pipeline 5, and a first valve 12 is arranged on the pipeline. A circulation pipeline 17 is connected to the sampling pump 13 at the top of the storage tank 2, and the top of the potentiometric titrator 3 is connected to the circulation pipeline 17 through its sampling needle 16. The control system version is Honeywell pks r500. The control system 4 is respectively connected to the potentiometric titrator 3, the first valve 12, the second valve 14, the third valve 15 and the flow regulating valve 9 by telecommunication. The first valve 12, the second valve 14 and the third valve 15 are all pneumatically driven valves.
[0013] After only opening the first valve 12, the potentiometric titrator 3 can sample the ammonia water in the supply pipe 5, and then the potentiometric titrator 3 uses a hydrochloric acid standard solution for titration. When the pH value is approximately 4, the titration end point is found through the titration jump, the ammonia content in the raw water is calculated, and the data is transmitted to the control system 4. The control system then controls the flow regulating valve 9 to configure the desalted water, and controls the amount of desalted water added according to the requirement of configuring the dilute ammonia water concentration of 20.7%.
[0014] When only the second valve 14 is opened, the ammonia water after being configured in the delivery pipeline 7 can be sampled, and the potentiometric titrator 3 uses hydrochloric acid standard solution for titration. When the pH value is about 4, the titration end point is found through the titration jump, and the ammonia content in the solution is calculated. The result data is directly transmitted to the control system 4. The amount of desalted water added is interlocked according to the ammonia content. When the ammonia content is 20.5%~21.0%, the amount of desalted water is maintained unchanged. When the content is lower than 20%, the amount of desalted water required to be added when the content is 21.0% is calculated according to the raw ammonia water flow rate and the desalted water flow rate, and the flow regulating valve 9 is used to adjust the amount of desalted water added to reduce the amount of desalted water added; when the content is higher than 21.0%, the amount of desalted water required to be added when the content is 20.5% is calculated, and the flow regulating valve 9 is used to adjust the amount of desalted water added to achieve interlocking control, thereby achieving continuous and stable production of dilute ammonia water. When only the third valve 15 is opened, the ammonia water in the storage tank is sampled and titrated with a standard hydrochloric acid solution by a potentiometric titrator. When the pH value is approximately 4, the titration endpoint is found through the titration jump, and the ammonia content in the solution is calculated. The result data is directly transmitted to the control system 4, and the main control personnel determines whether to adjust the configuration concentration based on the storage tank liquid level and the measured content to ensure that the product quality meets the needs of different customers.
Claims
1. The dilute ammonia concentration analysis system is connected to the raw ammonia tank and is characterized by: It includes a storage tank, a potentiometric titrator, a sampling pump and a control system. The raw ammonia water tank is connected to the configuration point through a supply pipeline, and then connected to the storage tank through a delivery pipeline. The configuration point is also connected to a desalted water pipeline, and a flow regulating valve is set on the desalted water pipeline. A circulation pipeline is connected to the storage tank, and a circulation pump is set on the circulation pipeline. The outlet of the circulation pump is connected to the upper part of the storage tank. The outlet of the circulation pump is also connected to a sampling pipeline connected to the sampling pump, and a third valve is set on the sampling pipeline; a pipeline is also connected to the sampling pump on the delivery pipeline, and a second valve is set on the pipeline A pipe is also connected to the sampling pump from the raw ammonia water supply pipe, and a first valve is arranged on the pipe; a circulation pipe is also connected to the sampling pump from the top of the storage tank, and the potentiometric titrator is connected to the circulation pipe through its sampling needle; the control system is respectively connected to the potentiometric titrator, the first valve, the second valve, the third valve and the flow regulating valve by telecommunication; the ammonia content is determined by the potentiometric titrator; the sampling pump is connected to three sampling points at the same time, and through the control of the first valve, the second valve and the third valve, the samples at the three points can be analyzed by a common potentiometric titrator.
2. The dilute ammonia concentration analysis system according to claim 1, characterized in that The control system version is Honeywell pks r500.
3. The dilute ammonia concentration analysis system according to claim 1, characterized in that The first valve, the second valve and the third valve are all pneumatically driven valves.
4. The dilute ammonia concentration analysis system according to claim 1, characterized in that A liquid level gauge is arranged in the storage tank.