Automatic preparation and dosing system for sodium erythorbate deoxidant

Abstract

The utility model belongs to the technical field of dosing devices, and particularly relates to an automatic preparing and dosing system for a sodium erythorbate deoxidant. Comprising a sodium erythorbate storage tank, a preparation tank, a dosing pump, a deaerator and a water feeding pump which are connected in sequence, a top outlet of the sodium erythorbate storage tank is connected with a pressure relief pipeline, the pressure relief pipeline is provided with a back flushing type filter, a bottom outlet of the sodium erythorbate storage tank is connected with an electric rotary feeding valve and a weighing sensor, and the weighing sensor is connected with the sodium erythorbate storage tank. The preparation tank is connected with a desalted water pipeline; an online dissolved oxygen analyzer is arranged at an outlet of the deaerator; an outlet of the nitrogen pipeline is respectively connected with inlet pipelines of the back flushing type filter, the sodium erythorbate storage tank and the preparation tank through pipelines; a control system is further included. And through precise control, the deoxygenation requirement is met. On-line monitoring and automatic adjustment are combined, the dissolved oxygen index is stabilized within the preset range, fluctuation caused by manual adjustment is effectively avoided, the running stability of a downstream boiler is remarkably improved, and meanwhile the working efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of dosing devices, and particularly relates to an automatic preparation and dosing system for sodium erythorbate deoxidizer. Background Art

[0002] In a boiler system, dissolved oxygen is a key factor causing boiler corrosion. Long-term oxygen corrosion will significantly shorten the service life of the boiler and pose a threat to the safe operation of the boiler. For boilers with a rated evaporation capacity greater than or equal to 10 t / h, their feed water must be deoxygenated. Even for boilers with a rated evaporation capacity less than 10 t / h, in case of local oxygen corrosion, corresponding deoxygenation measures should be taken.

[0003] Traditional deoxygenation methods include thermal deoxygenation, chemical deoxygenation, and the combined use of both. However, in practical applications, deoxygenators often face various challenges, such as the lack of heating steam at the initial stage of startup, poor deoxygenation effect, or equipment failures. For large-flow feed water systems, simple chemical deoxygenation often fails to meet the requirements. Therefore, the combined method of thermal + chemical deoxygenation has become the mainstream.

[0004] Among chemical deoxygenation agents, sodium erythorbate has become a widely popular deoxidizer due to its advantages such as low price, environmental friendliness, non-toxicity, and fast deoxygenation speed. However, the dosing amount of sodium erythorbate is relatively large. The traditional manual preparation and dosing methods are not only inefficient but also difficult to ensure the accuracy and timeliness of preparation. Especially when the deoxygenation system has a poor effect, it is necessary to frequently manually adjust the dosing amount, which not only increases the operation difficulty but also easily leads to large fluctuations in the dissolved oxygen index, posing a threat to the safe and stable operation of the boiler. Summary of the Utility Model

[0005] In view of the above deficiencies in the prior art, the purpose of the present utility model is to provide an automatic preparation and dosing system for sodium erythorbate deoxidizer, which realizes the automatic preparation and dosing of the solution, significantly reduces manual operations, improves work efficiency, reduces the risk of human errors, and reduces the potential impact on the health of operators. At the same time, the system can accurately control the raw material dosage, ensure the accuracy of the solution concentration, and meet the deoxygenation requirements. Combining online monitoring and automatic adjustment technologies, the dissolved oxygen index is stabilized within a preset range, effectively avoiding the fluctuations caused by manual adjustment, thereby significantly improving the safety and stability of the downstream boiler operation.

[0006] The present utility model is implemented by adopting the following technical solutions:

[0007] The automatic preparation and dosing system for sodium erythorbate deoxidizer includes a sodium erythorbate storage tank, a preparation tank, a dosing pump, a deaerator and a feed water pump connected in sequence. Among them, the top outlet of the sodium erythorbate storage tank is connected with a pressure relief pipeline, and an inverse blow filter is arranged on the pressure relief pipeline. The bottom outlet of the sodium erythorbate storage tank is connected with an electric rotary feeder valve and a weighing sensor. The preparation tank is connected with a desalted water pipeline, and an on-line dissolved oxygen analyzer is arranged at the outlet of the deaerator. It also includes a nitrogen pipeline, and the outlet of the nitrogen pipeline is respectively connected with the inverse blow filter, the inlet pipeline of the sodium erythorbate storage tank and the preparation tank through pipelines, and a filter inverse blow valve, a nitrogen purge valve and a purge pressure compensation valve are respectively arranged on the pipelines. It also includes a control system.

[0008] The top of the sodium erythorbate storage tank is provided with a filling port, and a stirrer is arranged inside the preparation tank.

[0009] Pressure monitoring devices are respectively arranged inside the sodium erythorbate storage tank and the preparation tank, and differential pressure gauges are arranged at both ends of the inverse blow filter.

[0010] A desalted water flowmeter and a desalted water regulating valve are arranged on the desalted water pipeline.

[0011] The dosing pump is a variable frequency water pump, and a dosing flowmeter is arranged on the pipeline from the dosing pump to the deaerator.

[0012] A weight alarm device is arranged on the weighing sensor.

[0013] The working principle of the automatic preparation and dosing system for sodium erythorbate deoxidizer is as follows:

[0014] Sodium erythorbate is added into the sodium erythorbate storage tank through the filling port, and the nitrogen purge valve is opened to displace the sodium erythorbate storage tank to prevent air from entering and causing material oxidation. An inverse blow filter and a differential pressure gauge are installed on the pressure relief pipeline of the sodium erythorbate storage tank to monitor the working state of the inverse blow filter in real time. When the differential pressure of the inverse blow filter increases due to blockage, the filter inverse blow valve is opened to start the inverse blow program to ensure the filtering effect. A weighing sensor is arranged at the bottom of the sodium erythorbate storage tank, which can measure and display the remaining amount of sodium erythorbate in real time. When the remaining amount of sodium erythorbate reaches the low limit, the weight alarm device will be triggered to alarm to ensure that there is sufficient material in the sodium erythorbate storage tank.

[0015] The operator inputs the concentration and volume of the sodium erythorbate solution to be prepared through the control system, and the control system automatically calculates the amounts of sodium erythorbate and demineralized water required. Open the demineralized water regulating valve, and accurately measure the amount of demineralized water injected into the preparation tank using the demineralized water flowmeter. Close the demineralized water regulating valve until the preset amount is reached. After the addition of demineralized water is completed, the electric rotary feeder valve automatically opens, and the dosing amount of sodium erythorbate is monitored in real time through the weighing sensor. Close the electric rotary feeder valve until the preset value is reached, and open the purge and pressure compensation valve to purge the pipeline. Then start the stirrer to ensure that sodium erythorbate and demineralized water are fully and evenly mixed.

[0016] The dissolved oxygen content in the water at the outlet of the deaerator is monitored in real time through an on-line dissolved oxygen analyzer, and the data is transmitted back to the control system. The operator sets the target control value of dissolved oxygen. When the measured value deviates from the target control value, the control system automatically adjusts the output frequency of the chemical dosing pump inverter, thereby increasing or decreasing the dosing amount of the sodium erythorbate solution in the deaerator, and monitors it in real time through the chemical dosing flowmeter to ensure the stability of the dissolved oxygen index. The treated qualified water is transported to the boiler user through the feed water pump.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] (1) The automatic preparation and dosing system of sodium erythorbate deoxidizer described in the present utility model realizes the automatic preparation and dosing of sodium erythorbate solution, greatly reduces manual operation, improves work efficiency, and reduces the risk of human error; at the same time, the automatic preparation and dosing process reduces manual contact and reduces the impact on the health of operators;

[0019] (2) The automatic preparation and dosing system of sodium erythorbate deoxidizer described in the present utility model can automatically calculate and accurately control the dosing amounts of sodium erythorbate and demineralized water, ensure that the concentration of the prepared solution is accurate, and meet the precise requirements of boiler deoxidation; at the same time, the dissolved oxygen content in the deaerator is monitored in real time through an on-line dissolved oxygen analyzer, and the frequency conversion output of the chemical dosing pump is automatically adjusted through the control system to ensure that the dissolved oxygen index is stable within the set range, avoiding the dissolved oxygen fluctuation caused by untimely or inaccurate manual adjustment, and improving the safety and stability of boiler operation in downstream applications. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the automatic preparation and dosing system of sodium erythorbate deoxidizer described in the present utility model;

[0021] In the figure: 1. Sodium erythorbate storage tank; 2. Preparation tank; 3. Chemical dosing pump; 4. Deaerator; 5. Feed water pump; 6. Backwashing filter; 7. Electric rotary feeder valve; 8. Weighing sensor; 9. Desalted water pipeline; 10. On-line dissolved oxygen analyzer; 11. Filter backwashing valve; 12. Nitrogen purging valve; 13. Purging and pressure compensating valve; 14. Filling port; 15. Agitator; 16. Pressure monitoring device; 17. Differential pressure gauge; 18. Desalted water flowmeter; 19. Desalted water regulating valve; 20. Chemical dosing flowmeter; 21. Weight alarm device. Detailed implementation mode

[0022] In order to make the purpose and technical solution of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0023] Embodiment 1

[0024] As Figure 1 shown, the automatic preparation and dosing system for sodium erythorbate deoxidizer includes a sodium erythorbate storage tank 1, a preparation tank 2, a chemical dosing pump 3, a deaerator 4 and a feed water pump 5 connected in sequence. Among them, the top outlet of the sodium erythorbate storage tank 1 is connected with a pressure relief pipeline, and a backwashing filter 6 is arranged on the pressure relief pipeline. The bottom outlet of the sodium erythorbate storage tank 1 is connected with an electric rotary feeder valve 7 and a weighing sensor 8. The preparation tank 2 is connected with a desalted water pipeline 9. An on-line dissolved oxygen analyzer 10 is arranged at the outlet of the deaerator 4; it also includes a nitrogen pipeline, and the outlet of the nitrogen pipeline is respectively connected with the inlet pipelines of the backwashing filter 6, the sodium erythorbate storage tank 1 and the preparation tank 2 through pipelines, and a filter backwashing valve 11, a nitrogen purging valve 12 and a purging and pressure compensating valve 13 are respectively arranged on the pipelines; it also includes a control system.

[0025] The top of the sodium erythorbate storage tank 1 is provided with a filling port 14, and an agitator 15 is arranged inside the preparation tank 2.

[0026] Pressure monitoring devices 16 are respectively arranged inside the sodium erythorbate storage tank 1 and the preparation tank 2, and differential pressure gauges 17 are arranged at both ends of the backwashing filter 6.

[0027] A desalted water flowmeter 18 and a desalted water regulating valve 19 are arranged on the desalted water pipeline 9.

[0028] The chemical dosing pump 3 is a variable-frequency water pump, and a chemical dosing flowmeter 20 is arranged on the pipeline from the chemical dosing pump 3 to the deaerator 4.

[0029] A weight alarm device 21 is arranged on the weighing sensor 8.

[0030] During operation, the specific process is as follows:

[0031] 1) Through the filling port 14 at the top of the sodium erythorbate storage tank 1, an appropriate amount of sodium erythorbate is added to the sodium erythorbate storage tank 1. Subsequently, the nitrogen purge valve 12 is opened to introduce low-pressure nitrogen into the storage tank to displace the air in the tank and prevent the oxidation of sodium erythorbate. During the nitrogen purging process, the nitrogen flow rate is controlled by the nitrogen purge valve 12 on the pressure relief pipeline, and at the same time, it is monitored in real-time by the pressure monitoring device 16 to maintain the pressure in the sodium erythorbate storage tank 1 within the set range.

[0032] 2) The operator inputs the concentration and volume of the sodium erythorbate solution to be prepared through the control system. The system automatically calculates the required amounts of sodium erythorbate and demineralized water according to the input parameters. The control system automatically opens the demineralized water regulating valve 19 on the demineralized water pipeline 9 and at the same time starts the demineralized water flowmeter 18 for accurate metering. The demineralized water flows into the preparation tank 2 through the pipeline. After reaching the preset amount of demineralized water, the system automatically closes the demineralized water regulating valve 19 and stops adding demineralized water.

[0033] 3) After the addition of demineralized water is completed and the demineralized water is ensured to be stable in the preparation tank 2, the control system automatically opens the electric rotary feeding valve 7 at the bottom of the sodium erythorbate storage tank 1. At the same time, the weighing sensor 8 monitors the feeding amount of sodium erythorbate in real-time and transmits the data to the control system. When the feeding amount reaches the preset value, the system automatically closes the electric rotary feeding valve 7 and stops adding sodium erythorbate. After the addition of sodium erythorbate is completed, the purge and pressure compensation valve 13 is opened to purge the feeding pipeline to prevent material residue.

[0034] 4) The control system starts the stirrer 15 in the preparation tank 2 to fully stir the mixture of sodium erythorbate and demineralized water. The stirring time is set according to the preset parameters to ensure that the mixture is uniform and free of lumps. After stirring is completed, the stirrer 15 automatically stops running.

[0035] 5) The on-line dissolved oxygen analyzer monitors the dissolved oxygen content in the water at the outlet of the deaerator 4 in real-time and transmits the data to the control system in real-time. The operator sets the target control value of dissolved oxygen through the control system. When the measured dissolved oxygen content deviates from the target control value, the control system automatically adjusts the output frequency of the frequency converter of the dosing pump 3, thereby increasing or decreasing the dosing amount of the sodium erythorbate solution. During the dosing process, the dosing flowmeter 20 monitors and records the dosing amount in real-time to ensure the accuracy of the dosing amount. Through the automatic adjustment of the control system, the dissolved oxygen content in the deaerated water is maintained within the target control value range to ensure that the quality of the treated water meets the standards and meets the water use requirements of the downstream boiler user side.

Claims

1. A sodium isoascorbate scavenger automatic preparation and dosing system, characterized in that: The invention comprises a sodium isoascorbate storage tank (1), a preparation tank (2), a dosing pump (3), a deaerator (4) and a water supply pump (5) which are connected in sequence, wherein the top outlet of the sodium isoascorbate storage tank (1) is connected to a pressure relief pipeline, on which a back-flushing filter (6) is arranged, the bottom outlet of the sodium isoascorbate storage tank (1) is connected to an electric rotary feeding valve (7) and a weighing sensor (8), the preparation tank (2) is connected to a desalted water pipeline (9), and the outlet of the deaerator (4) is provided with an online dissolved oxygen analyzer (10); the invention also comprises a nitrogen pipeline, the outlet of the nitrogen pipeline is connected to the back-flushing filter (6), the inlet pipelines of the sodium isoascorbate storage tank (1) and the preparation tank (2) respectively through pipelines, and the pipelines are respectively provided with a filter back-flushing valve (11), a nitrogen purge valve (12) and a purge pressure boosting valve (13); and the invention also comprises a control system.

2. The automatic preparation and dosing system of sodium isoascorbate scavenger according to claim 1, characterized in that: The top of the sodium isoascorbate storage tank (1) is provided with a filling port (14), and a stirrer (15) is provided inside the preparation tank (2).

3. The automatic preparation and dosing system of sodium isoascorbate scavenger according to claim 1, characterized in that: The sodium isoascorbate storage tank (1) and the preparation tank (2) are respectively provided with pressure monitoring devices (16), and the two ends of the back-blowing filter (6) are provided with differential pressure gauges (17).

4. The automatic preparation and dosing system of sodium isoascorbate scavenger according to claim 1, characterized in that: The desalted water pipeline (9) is provided with a desalted water flow meter (18) and a desalted water regulating valve (19).

5. The automatic preparation and dosing system of sodium isoascorbate scavenger according to claim 1, characterized in that: The dosing pump (3) is a variable frequency water pump, and a dosing flow meter (20) is provided on the pipeline from the dosing pump (3) to the deaerator (4).

6. The automatic preparation and dosing system of sodium isoascorbate scavenger according to claim 1, characterized in that: The weighing sensor (8) is provided with a weight alarm device (21).

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