Device for adding chemical deoxidant into boiler water tank

Abstract

The utility model discloses a device for adding a chemical deoxidant into a boiler water tank, which comprises a deoxidant charging basket (1), a dosing device, a control unit (4), a water inlet flow meter (5) and a dissolved oxygen measuring probe (6), the deoxidant charging basket (1) is provided with a dosing device, and the dosing device is connected with a dosing hole on a water tank water inlet pipe (3) through a dosing pipe (2). The dosing device, the water inlet flow meter (5) and the dissolved oxygen measuring probe (6) are all electrically connected with the control unit (4); the water inlet flow meter (5) is arranged on the water tank water inlet pipe (3), and the dissolved oxygen measuring probe (6) is arranged on the water tank water outlet pipe (7). The chemical deoxidant can be automatically added into the boiler feed water.

Description

TECHNICAL FIELD

[0001] The utility model relates to a medicament adding device, in particular to a device for adding chemical oxygen scavenger to the boiler water tank. BACKGROUND

[0002] GB / T1576-2018 industrial boiler water quality has explicit standard requirements to the oxygen content of boiler feed water. The dissolved oxygen of feed water is not more than 0.10mg / L when using softened water to supply the boiler, and the dissolved oxygen of feed water is not more than 0.05mg / L when using reverse osmosis and sodium ion exchange to supply the boiler.

[0003] The traditional boiler oxygen removal equipment is thermal oxygen removal, and its principle is that when the temperature of boiler feed water is heated to 105 DEG C, the dissolved oxygen concentration is very low, but there is no effective detection equipment, and the risk of excessive oxygen content is great. Therefore, the thermal oxygen removal and the auxiliary chemical oxygen removal are the best way to control the dissolved oxygen.

[0004] There are many types of domestic boiler feed water oxygen scavengers, such as sodium sulfite Na2SO3, hydrazine N2H4, acetone oxime C3H7NO, carbon hydrazide CON4H6, acetaldehyde oxime C2H5NO, isoascorbic acid C6H8O6 and sodium salt, but it is necessary to carry out experimental verification to select which one is suitable for local water quality requirements and has good oxygen scavenger effect. However, there is no device for adding chemical oxygen scavenger to the boiler water tank at present, so it is difficult to verify. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a device for adding chemical oxygen scavenger to the boiler water tank to solve the technical problems in the prior art, which can automatically add chemical oxygen scavenger to the boiler feed water.

[0006] The utility model provides a device for adding chemical oxygen scavenger to the boiler water tank, including oxygen scavenger material bucket, install dosing device on the oxygen scavenger material bucket, the dosing device is connected with dosing hole on water tank inlet pipe through dosing pipe, still include control unit, water inflow meter and dissolved oxygen measurement probe, dosing device, water inflow meter and dissolved oxygen measurement probe all are connected with control unit electricity, water inflow meter is installed on water tank inlet pipe, and dissolved oxygen measurement probe is installed on water tank outlet pipe.

[0007] In the foregoing device for adding chemical oxygen scavenger to the boiler water tank, preferably, the dosing device includes a dosing pipe, a metering pump and a dosing pipe, the feed end of the metering pump is connected with the oxygen scavenger material bucket through the dosing pipe, the discharge end of the metering pump is connected with the dosing pipe through the dosing pipe, and the dosing pipe is provided with a first back pressure valve.

[0008] In the aforementioned device for adding chemical deoxidizer to a boiler water tank, preferably, the top of the deoxidizer tank is provided with a dosing port, and a tank cover is installed on the dosing port.

[0009] In the aforementioned device for adding chemical deoxygenating agent into a boiler water tank, preferably, the feed hopper cover is provided with a return pipe, the discharge pipe is connected to the return pipe through a connecting pipe, and a second back pressure valve is provided on the connecting pipe.

[0010] In the aforementioned device for adding chemical deoxygenating agent to a boiler water tank, preferably, a sampling pipe is also connected to the discharge pipe, and a first manual valve is provided on the sampling pipe.

[0011] In the aforementioned device for adding chemical deoxygenating agent to a boiler water tank, preferably, the control unit includes a PLC controller and a dissolved oxygen display, the dissolved oxygen measuring probe is electrically connected to the dissolved oxygen display, and the dissolved oxygen display, the inlet flow meter, and the metering pump are all electrically connected to the PLC controller.

[0012] In the aforementioned device for adding chemical deoxygenating agent to a boiler water tank, preferably, a liquid level sensor is also installed on the deoxygenating agent tank, and the liquid level sensor is electrically connected to the PLC controller.

[0013] In the aforementioned device for adding chemical deoxidizer to a boiler water tank, preferably, the top of the deoxidizer tank is connected to a flushing pipe, the bottom of the deoxidizer tank is connected to a drain pipe, the flushing pipe is equipped with a second manual valve, and the drain pipe is equipped with a third manual valve.

[0014] In the aforementioned device for adding chemical deoxidizer to a boiler water tank, preferably, the upper end of the side wall of the deoxidizer tank is connected to an overflow pipe, and the lower end of the overflow pipe is connected to the drain pipe.

[0015] Compared with existing technologies, this utility model includes a deoxygenating agent tank with a dosing device installed on it. The dosing device is connected to a dosing port on the water tank inlet pipe via a dosing pipe. It also includes a control unit, an inlet flow meter, and a dissolved oxygen measuring probe. The dosing device, inlet flow meter, and dissolved oxygen measuring probe are all electrically connected to the control unit. The inlet flow meter is installed on the water tank inlet pipe, and the dissolved oxygen measuring probe is installed on the water tank outlet pipe. This utility model features a deoxygenating agent tank capable of holding deoxygenating agent. The dosing device pumps the deoxygenating agent from the tank into the water tank's collection pipe, which then enters the boiler feedwater tank via the incoming water. The dissolved oxygen measuring probe measures the dissolved oxygen level in the water at the water tank outlet pipe in real time. The control unit controls the dosage of the dosing device based on the detected dissolved oxygen level, automatically adjusting the dissolved oxygen level in the boiler feedwater tank to a suitable range. This utility model achieves automatic dosing, allowing operators to quickly determine which chemical deoxygenating agent is suitable for the local water quality. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Explanation of reference numerals in the attached diagram: 1. Deoxygenating agent tank; 2. Dosing pipe; 3. Water tank inlet pipe; 4. Control unit; 5. Inlet flow meter; 6. Dissolved oxygen measuring probe; 7. Water tank outlet pipe; 8. Inlet pipe; 9. Metering pump; 10. Outlet pipe; 11. First back pressure valve; 12. Dosing port; 13. Tank cover; 14. Return pipe; 15. Connecting pipe; 16. Second back pressure valve; 17. Sampling pipe; 18. First manual valve; 19. PLC controller; 20. Dissolved oxygen display; 21. Liquid level sensor; 22. Flushing pipe; 23. Drain pipe; 24. Second manual valve; 25. Third manual valve; 26. Overflow pipe; 27. Boiler feedwater tank. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] Embodiments of this utility model: such as Figure 1 As shown, an apparatus for adding chemical deoxygenating agent to a boiler water tank includes a deoxygenating agent tank 1, on which a dosing device is installed. The dosing device is connected to a dosing port on the water tank inlet pipe 3 via a dosing pipe 2. The apparatus also includes a control unit 4, an inlet flow meter 5, and a dissolved oxygen measuring probe 6. The dosing device, the inlet flow meter 5, and the dissolved oxygen measuring probe 6 are all electrically connected to the control unit 4. The inlet flow meter 5 is installed on the water tank inlet pipe 3, and the dissolved oxygen measuring probe 6 is installed on the water tank outlet pipe 7.

[0020] In this application, the water tank inlet pipe 3 is connected to the top of the boiler feedwater tank 27, and the water tank outlet pipe 7 is connected to the lower part of the boiler feedwater tank 27. The deoxygenating agent tank 1 is used to hold the deoxygenating agent. The deoxygenating agent in the deoxygenating agent tank 1 is extracted by the dosing device and added to the water tank inlet pipe 3 through the dosing pipe 2. The dosing amount of the dosing device is controlled by the control unit. The control unit detects the dissolved oxygen value in the water in the water tank outlet pipe 7 through the dissolved oxygen measuring probe 6. The control unit calculates the dosing amount based on the dissolved oxygen value and controls the dosing device to adjust the dosing amount.

[0021] Specifically, the dosing device includes an inlet pipe 8, a metering pump 9, and an outlet pipe 10. The inlet end of the metering pump 9 is connected to the deoxidizer tank 1 through the inlet pipe 8, and the outlet end of the metering pump 9 is connected to the dosing pipe 2 through the outlet pipe 10. A first back pressure valve 11 is provided on the outlet pipe 10.

[0022] The lower end of the inlet pipe 8 passes through the top plate of the scavenger tank 1 and extends to the bottom inside the scavenger tank 1. The metering pump 9 can adjust the pumping rate according to the instructions of the control unit.

[0023] In a preferred embodiment, the deoxidizer tank 1 is also equipped with a backup dosing device. The backup dosing device has the same structure as the dosing device. When the dosing device malfunctions, the dosing can be done through the backup dosing device without affecting the use of the equipment.

[0024] Furthermore, the top of the oxygen scavenger tank 1 is provided with a dosing port 12, and a tank cover 13 is installed on the dosing port 12.

[0025] Open the material tank cover 13 and add chemical oxygen scavenger into the oxygen scavenger tank 1 through the dosing port 12. The chemical oxygen scavenger can be sodium sulfite (Na2SO3), hydrazine (N2H4), acetone oxime (C3H7NO), carbazide (CON4H6), acetaldehyde oxime (C2H5NO), isoascorbic acid (C6H8O6), or its sodium salt. After adding the chemical oxygen scavenger, close the material tank cover 13.

[0026] The material tank cover 13 is equipped with a return pipe 14. The outlet pipe 10 of the dosing device is connected to the return pipe 14 through a connecting pipe 15. A second back pressure valve 16 is provided on the connecting pipe 15. Similarly, when a standby dosing device is provided, the standby dosing device is also connected to the return pipe 14 through a connecting pipe. A second back pressure valve is also provided on the connecting pipe.

[0027] It should be noted that the opening pressure of the second back pressure valve 16 should be greater than that of the first back pressure valve 11. The function of setting the return pipe 14 and the second back pressure valve 16 is that when the pressure in the outlet pipe 10 is too high, the second back pressure valve 16 will open to protect the pipeline, and the deoxidizer will return to the deoxidizer tank 1 through the connecting pipe 15 and the return pipe 14, so that the pressure in the outlet pipe 10 will drop.

[0028] A sampling tube 17 is also connected to the dispensing tube 10, and a first manual valve 18 is installed on the sampling tube 17. The oxygen absorber can be sampled through the sampling tube 17, which facilitates the staff to test the oxygen absorber in the oxygen absorber tank 1.

[0029] Furthermore, the control unit 4 includes a PLC controller 19 and a dissolved oxygen display 20. The dissolved oxygen measuring probe 6 is electrically connected to the dissolved oxygen display 20. The dissolved oxygen display 20, the inlet flow meter 5, and the metering pump 9 are all electrically connected to the PLC controller 19.

[0030] Both the PLC controller 19 and the dissolved oxygen display 20 are commercially available products and can be purchased directly. The internal structure and working principle of the PLC controller 19 and the dissolved oxygen display 20 will not be described in detail in this embodiment. The dissolved oxygen data collected by the dissolved oxygen measuring probe 6 is sent to the dissolved oxygen display 20, which displays the specific value of dissolved oxygen. Simultaneously, the dissolved oxygen display 20 converts the dissolved oxygen data into a digital signal and sends it to the PLC controller 19.

[0031] In this embodiment, the PLC controller 19 can be a Siemens-1200 model, the dissolved oxygen measuring probe 6 has a measuring range of 0 mg / L - 0.20 mg / L and a temperature resistance rating of 120℃, and the dissolved oxygen display 20 has a display resolution of 0.001 mg / L.

[0032] Furthermore, a liquid level sensor 21 is also installed on the deoxygenator tank 1, and the liquid level sensor 21 is electrically connected to the PLC controller 19.

[0033] The liquid level sensor 21 is used to measure the remaining amount of chemical deoxygenator in the deoxygenator tank 1 in real time. When the remaining amount is detected to be lower than the preset value, the PLC controller 19 issues an alert and controls the metering pump 9 to stop working.

[0034] Furthermore, the top of the deoxidizer tank 1 is connected to a flushing pipe 22, and the bottom of the deoxidizer tank 1 is connected to a drain pipe 23. The flushing pipe 22 is equipped with a second manual valve 24, and the drain pipe 23 is equipped with a third manual valve 25.

[0035] Clean water can be introduced into the oxygen scavenger tank 1 through the flushing pipe 22 to clean the tank. The waste liquid from the cleaning can be discharged through the drain pipe 23. The oxygen scavenger tank 1 needs to be thoroughly cleaned each time the chemical oxygen scavenger is replaced.

[0036] Preferably, the upper end of the side wall of the scavenger tank 1 is connected to an overflow pipe 26, and the lower end of the overflow pipe 26 is connected to a drain pipe 23. When there is too much clean water in the scavenger tank 1, it can be discharged through the overflow pipe 26 into the drain pipe 23.

[0037] A method for verifying which deoxygenator is suitable for local water quality using this application is illustrated using a softened water supply boiler as an example.

[0038] Sodium sulfite (Na2SO3), hydrazine (N2H4), acetone oxime (C3H7NO), carbazide (CON4H6), acetaldehyde oxime (C2H5NO), isoascorbic acid (C6H8O6), and its sodium salt were added separately to oxygen scavenger tank 1 for the experiment. The experimental methods were the same, and the specific methods were as follows:

[0039] When the equipment is started, the PLC programmable controller 19 collects the inlet water flow information through the inlet flow meter 5 and the dissolved oxygen measuring probe 6 collects the dissolved oxygen value in the water in the outlet pipe 7 of the water tank. After the dissolved oxygen value is transmitted to the dissolved oxygen display 20, the dissolved oxygen display 20 converts the dissolved oxygen value into a digital signal and sends it to the PLC controller 19. After the PLC controller 19 obtains the dissolved oxygen value, it compares it with the set value, which is 0.1 mg / L. If the dissolved oxygen value is lower than the set value of 0.1 mg / L, the PLC controller 19 controls the metering pump 9 to stop operating. When the measured dissolved oxygen value is greater than or equal to 0.1 mg / L, the PLC controller 19 controls the metering pump 9 to work. The flow rate of the metering pump 9 is adjusted by the PLC controller 19 according to the specific value of the dissolved oxygen. The higher the dissolved oxygen value, the higher the flow rate of the metering pump 9, and the lower the dissolved oxygen value, the lower the flow rate of the metering pump 9.

[0040] The staff can calculate the water volume by collecting the water flow information through the water inlet flow meter 5, and calculate the amount of deoxygenator consumed through the liquid level sensor 21. In this way, the amount of deoxygenator consumed under a fixed water volume can be calculated.

[0041] Calculations were performed on the various chemical deoxygenators mentioned above. The deoxygenator that can rapidly reduce dissolved oxygen content is currently the best deoxygenator for water quality. Some deoxygenators are not effective in reducing dissolved oxygen content and are therefore eliminated from this experimental setup.

[0042] The above description, based on the embodiments shown in the drawings, details the structure, features, and effects of this utility model. The above description is only a preferred embodiment of this utility model, but the scope of implementation of this utility model is not limited to what is shown in the drawings. Any changes made in accordance with the concept of this utility model, or modifications to equivalent embodiments, that do not exceed the spirit covered by the specification and drawings, shall be within the protection scope of this utility model.

Claims

1. A device for adding chemical oxygen scavenger to a boiler tank, comprising an oxygen scavenger cartridge (1), characterized in that: The oxygen scavenger tank (1) is provided with a dosing device, the dosing device is connected with the dosing hole on the water inlet pipe (3) of the water tank through a dosing pipe (2), further comprising a control unit (4), a water inlet flow meter (5) and a dissolved oxygen measuring probe (6), the dosing device, the water inlet flow meter (5) and the dissolved oxygen measuring probe (6) are electrically connected with the control unit (4); the water inlet flow meter (5) is installed on the water inlet pipe (3) of the water tank, and the dissolved oxygen measuring probe (6) is installed on the water outlet pipe (7) of the water tank.

2. The device for adding chemical oxygen scavenger into a boiler water tank according to claim 1, characterized in that: The dosing device comprises a dosing pipe (8), a metering pump (9) and a dosing pipe (10), the feed end of the metering pump (9) is connected with the oxygen scavenger tank (1) through the dosing pipe (8), the discharge end of the metering pump (9) is connected with the dosing pipe (2) through the dosing pipe (10), and the dosing pipe (10) is provided with a first back pressure valve (11).

3. The device for adding chemical oxygen scavenger into a boiler water tank according to claim 2, characterized in that: The top of the oxygen scavenger tank (1) is provided with a dosing port (12), and the dosing port (12) is provided with a tank cover (13).

4. The device for adding chemical oxygen scavenger into a boiler water tank according to claim 3, characterized in that: The tank cover (13) is provided with a back dosing pipe (14), the dosing pipe (10) is connected with the back dosing pipe (14) through a connecting pipe (15), and the connecting pipe (15) is provided with a second back pressure valve (16).

5. The device for adding chemical oxygen scavenger into a boiler water tank according to claim 4, characterized in that: The dosing pipe (10) is further connected with a sampling pipe (17), and the sampling pipe (17) is provided with a first manual valve (18).

6. The device for adding chemical oxygen scavenger into a boiler water tank according to claim 5, characterized in that: The control unit (4) comprises a PLC controller (19) and a dissolved oxygen display (20), the dissolved oxygen measuring probe (6) is electrically connected with the dissolved oxygen display (20), and the dissolved oxygen display (20), the water inlet flow meter (5) and the metering pump (9) are electrically connected with the PLC controller (19).

7. The device for adding chemical oxygen scavenger into a boiler water tank according to claim 6, characterized in that: The oxygen scavenger tank (1) is further provided with a liquid level sensor (21), and the liquid level sensor (21) is electrically connected with the PLC controller (19).

8. The device for adding chemical oxygen scavenger to a boiler tank according to claim 1, characterized in that: The top of the oxygen scavenger tank (1) is further connected with a flushing pipe (22), the bottom of the oxygen scavenger tank (1) is connected with a drain pipe (23), the flushing pipe (22) is provided with a second manual valve (24), and the drain pipe (23) is provided with a third manual valve (25).

9. The device for adding chemical oxygen scavenger into a boiler water tank according to claim 8, characterized in that: The upper end of the sidewall of the oxygen scavenger tank (1) is connected with an overflow pipe (26), and the lower end of the overflow pipe (26) is connected with the drain pipe (23).

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