Ferrous sulfate preparation tank stirring system

Abstract

The utility model discloses a ferrous sulfate preparation tank stirring system which comprises a preparation tank and a control end, the preparation tank is provided with a feeding pipeline and a discharging port, the discharging port of the preparation tank is provided with a three-way pipe through an anti-backflow valve, and the other two ends of the three-way pipe are communicated with a discharging valve and a gas injection pipeline respectively. The other end of the gas injection pipeline is communicated with the top of the preparation tank, a gas pump is arranged on the gas injection pipeline, and electric heaters which are connected in parallel are also arranged on the gas injection pipeline. According to the stirring system of the ferrous sulfate preparation tank, airflow is circularly introduced into the bottom of the ferrous sulfate preparation tank and controlled by a valve, the valve is opened to introduce compressed air for aeration during use to quickly and uniformly mix medicaments, the valve is closed when the stirring system is not used, a stirring pump is not used any more, and heating and temperature control are performed during preparation, so that the solubility of ferrous sulfate is improved, and precipitates are reduced; the energy consumption is reduced and the stirring is efficient.

Description

Technical Field

[0001] This utility model relates to the technical field of sewage treatment equipment, specifically a stirring system for a ferrous sulfate preparation tank used in sewage treatment. Background Technology

[0002] Ferrous sulfate degrades hexavalent chromium. It must be prepared half an hour in advance and continuously stirred with a stirring pump to ensure thorough mixing. The stirring pump must be kept running during use. If the stirring pump is stopped, the reagent will quickly settle. In daily operation, the stirring pump of the ferrous sulfate dosing tank must be turned on half an hour in advance each time to ensure that the reagent is mixed evenly before it can be added. The operation is cumbersome and not conducive to on-site operation.

[0003] To address the aforementioned problems, reduce energy consumption in ferrous sulfate preparation, and improve the stirring effect of precipitates, a stirring system for a ferrous sulfate preparation tank in wastewater treatment is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a stirring system for a ferrous sulfate preparation tank to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] The ferrous sulfate preparation tank stirring system includes a preparation tank and a control terminal. The preparation tank is equipped with a feeding pipeline and a discharge port. The discharge port of the preparation tank is connected to a tee pipe through an anti-backflow valve. The other two ends of the tee pipe are connected to the discharge valve and the gas injection pipeline, respectively. The other end of the gas injection pipeline is connected to the top of the preparation tank. An air pump is installed on the gas injection pipeline, and a parallel electric heater is also installed on the gas injection pipeline.

[0007] As a further improvement of this utility model: the preparation tank is equipped with a temperature sensor extending into the interior of the preparation tank, and the control terminal is connected to the temperature sensor and the electric heater via electrical signals. The control terminal controls the heating temperature of the electric heater based on the detection value of the temperature sensor.

[0008] As a further improvement of this utility model: both sides of the electric heater are provided with air valves a for controlling the air path, and air valve b is installed on the air injection line for controlling whether the air path is directly discharged to the three-way pipe.

[0009] As a further improvement of this utility model, the control terminal is also electrically connected to the anti-backflow valve and the discharge valve respectively, and the control terminal controls the opening and closing of the anti-backflow valve and the discharge valve.

[0010] As a further embodiment of this utility model: the output end of the feeding valve is connected to the gas-liquid separator, the bottom of the gas-liquid separator is provided with a material control valve, and the top of the gas-liquid separator is connected to the gas injection pipeline through a return gas pipe.

[0011] As a further improvement of this utility model, a reflux control valve for controlling the gas pressure inside the gas-liquid separator is provided on the reflux gas pipe.

[0012] As a further improvement of this invention, a pressure relief pipeline is provided on the top of the preparation tank.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] The stirring system of this ferrous sulfate preparation tank circulates air into the bottom of the ferrous sulfate preparation tank, controlled by a valve. When in use, the valve is opened to allow compressed air to aerate and quickly mix the reagent evenly. When not in use, the valve is closed, eliminating the need for a stirring pump. The system also features temperature control during preparation and heating, which improves the solubility of ferrous sulfate, reduces precipitation, reduces energy consumption, and ensures efficient stirring. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a stirring system for a ferrous sulfate preparation tank.

[0016] In the diagram: 1. Preparation tank; 2. Feeding line; 3. Gas injection line; 4. Gas valve b; 5. Air pump; 6. T-connector; 7. Anti-backflow valve; 8. Discharge valve; 9. Gas-liquid separator; 10. Control valve; 11. Return gas pipe; 12. Gas valve a; 13. Electric heater; 14. Pressure relief line; 15. Control terminal; 16. Temperature sensor. Detailed Implementation

[0017] Please see Figure 1 In this embodiment of the invention, the ferrous sulfate preparation tank stirring system includes a preparation tank 1 and a control terminal 15. The preparation tank 1 is equipped with a feeding pipeline 2 and a discharge port. The discharge port of the preparation tank 1 is connected to a three-way pipe 6 via an anti-backflow valve 7. The other two ends of the three-way pipe 6 are respectively connected to a discharge valve 8 and an air injection pipeline 3. The other end of the air injection pipeline 3 is connected to the top of the preparation tank 1. An air pump 5 is installed on the air injection pipeline 3, and a parallel electric heater 13 is also installed on the air injection pipeline 3. The airflow is circulated into the bottom of the ferrous sulfate preparation tank 1 and controlled by a valve. When in use, the valve is opened. The valve allows compressed air to be introduced for aeration, ensuring rapid and uniform mixing of the chemicals. When not in use, the valve can be closed, eliminating the need for a stirring pump or pre-starting the agitator. Through this modification: 1. The system's hexavalent chromium removal cycle is shortened, and operation is simple and quick. 2. Daily savings in electricity costs per stirring pump: 0.75KW * 6h / d * 0.41 yuan / kWh = 1.85 yuan; annual savings per pump: 1.85 yuan * 365 days = 675.25 yuan. Bottom aeration quickly and effectively floats and disperses bottom sediments into preparation tank 1, allowing for immediate use and shortening pre-treatment time.

[0018] The solubility of ferrous sulfate is significantly affected by temperature, increasing with increasing temperature. Specifically, the solubility data of ferrous sulfate in water at different temperatures are as follows:

[0019] At 10℃, its solubility is 20.3 g / 100 mL of water;

[0020] At 20℃, its solubility is 26.3 g / 100 mL of water;

[0021] At 30℃, its solubility is 30.8 g / 100 ml water;

[0022] At 40℃, its solubility is 40.1 g / 100 ml water;

[0023] These data indicate that ferrous sulfate has better solubility at higher temperatures;

[0024] In northern winters, the cold weather and large temperature differences between day and night often affect the solubility of ferrous sulfate. To address this, this application also includes an electric heater 13, which heats the circulating aeration airflow. Using the gas as a heat transfer medium, the gas and liquid phase come into full contact, thereby achieving rapid heat exchange, increasing the liquid phase temperature, and thus increasing the solubility of ferrous sulfate and reducing precipitation.

[0025] In a preferred embodiment, the preparation tank 1 is provided with a temperature sensor 16 extending into the interior of the preparation tank 1. The control terminal 15 is electrically connected to the temperature sensor 16 and the electric heater 13 respectively. The control terminal 15 controls the heating temperature of the electric heater 13 based on the detection value of the temperature sensor 16, thereby achieving the purpose of automatically controlling the liquid phase temperature inside the preparation tank 1.

[0026] In a preferred embodiment, air valves a12 for controlling the air path are provided on both sides of the electric heater 13, and air valve b4 for controlling whether the air path is directly discharged to the three-way pipe 6 is installed on the air injection line 3. When the internal temperature of the preparation tank 1 is lower than the set temperature, the air valve b4 is closed, and the air flow passes through the electric heater 13. Under the heating action of the electric heater 13, the temperature of the aeration air flow rises and agitation is performed. When the internal temperature of the preparation tank 1 is within the set temperature range, the air valve b4 is opened and the air valve a12 is closed. The air flow passes through the air injection line 3 directly to the three-way pipe 6 and agitation is performed.

[0027] In a preferred embodiment, the control terminal 15 is also electrically connected to the anti-backflow valve 7 and the discharge valve 8, respectively. The control terminal 15 controls the opening and closing of the anti-backflow valve 7 and the discharge valve 8, in the mixing operation step:

[0028] 1. The air pump 5 works to circulate air and inject air into the three-way pipe 6;

[0029] 2. With the discharge valve 8 closed and the anti-backflow valve 7 open;

[0030] 3. The airflow enters the interior of the preparation tank 1 through the anti-backflow valve 7;

[0031] 4. During the feeding process, both the anti-backflow valve 7 and the feeding valve 8 are in the open position;

[0032] 5. After mixing is complete, both the anti-backflow valve 7 and the discharge valve 8 are in the closed state.

[0033] In a preferred embodiment, the output end of the discharge valve 8 is connected to the gas-liquid separator 9. The bottom of the gas-liquid separator 9 is equipped with a material control valve 10, and the top of the gas-liquid separator 9 is connected to the gas injection line 3 through the return gas pipe 11. During the discharge process, in order to prevent sedimentation in the preparation tank 1, the air pump 5 still needs to operate. After the air pump 5 pumps the gas into the three-way pipe 6, two situations will occur: part of the airflow will flow upward into the interior of the preparation tank 1, and part of the airflow will enter the interior of the gas-liquid separator 9 along with the discharge. After separation by the gas-liquid separator 9, the airflow can be returned to the gas injection line 3 through the return gas pipe 11 to join the circulation.

[0034] In a preferred embodiment, a reflux control valve is provided on the reflux gas pipe 11 to control the gas pressure inside the gas-liquid separator 9. The reflux control valve controls the flow rate of the gas pressure inside the gas-liquid separator 9 to the gas injection line 3 by controlling the opening and closing degree. If the gas-liquid separator 9 is closed, the gas pressure inside the gas-liquid separator 9 will increase when the liquid phase enters, which will affect the speed and efficiency of the liquid phase discharge.

[0035] In a preferred embodiment, a pressure relief line 14 is provided at the top of the preparation tank 1. During the feeding process, if aeration and stirring are not required, the pressure relief line 14 is closed to prevent the liquid phase from entering the return gas pipe 11.

[0036] It should be noted that all the above embodiments belong to the same utility model concept, and the descriptions of each embodiment have different focuses. Where the description in a particular embodiment is not detailed, please refer to the description in other embodiments.

[0037] The embodiments described above merely illustrate the implementation of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A ferrous sulfate preparation tank stirring system, comprising a preparation tank (1) and a control terminal (15), wherein the preparation tank (1) is provided with a feeding pipeline (2) and a discharge port, characterized in that, The discharge port of the preparation tank (1) is connected to a three-way pipe (6) via an anti-backflow valve (7). The other two ends of the three-way pipe (6) are connected to the discharge valve (8) and the gas injection line (3), respectively. The other end of the gas injection line (3) is connected to the top of the preparation tank (1). An air pump (5) is installed on the gas injection line (3), and a parallel electric heater (13) is also installed on the gas injection line (3).

2. The ferrous sulfate preparation tank stirring system according to claim 1, characterized in that, The preparation tank (1) is equipped with a temperature sensor (16) extending into the interior of the preparation tank (1). The control terminal (15) is connected to the temperature sensor (16) and the electric heater (13) by electrical signals. The control terminal (15) controls the heating temperature of the electric heater (13) by the detection value of the temperature sensor (16).

3. The ferrous sulfate preparation tank stirring system according to claim 2, characterized in that, Both sides of the electric heater (13) are equipped with air valves a (12) for controlling the air path, and air valves b (4) for controlling whether the air path is directly discharged to the three-way pipe (6) are installed on the air injection line (3).

4. The ferrous sulfate preparation tank stirring system according to claim 2, characterized in that, The control terminal (15) is also electrically connected to the anti-backflow valve (7) and the discharge valve (8), respectively, and the control terminal (15) controls the opening and closing of the anti-backflow valve (7) and the discharge valve (8).

5. The ferrous sulfate preparation tank stirring system according to any one of claims 1-4, characterized in that, The output end of the discharge valve (8) is connected to the gas-liquid separator (9). The bottom of the gas-liquid separator (9) is equipped with a material control valve (10). The top of the gas-liquid separator (9) is connected to the gas injection line (3) through the return gas pipe (11).

6. The ferrous sulfate preparation tank stirring system according to claim 5, characterized in that, The return gas pipe (11) is equipped with a return control valve for controlling the gas pressure inside the gas-liquid separator (9).

7. The ferrous sulfate preparation tank stirring system according to claim 1, characterized in that, The top of the preparation tank (1) is equipped with a pressure relief pipeline (14).

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