Oil wastewater acid value self-regulation system

Abstract

The utility model provides a grease wastewater acid value self-regulation system, which is characterized in that a first control pipeline and a second control pipeline are arranged in parallel between a sulfuric acid source and an oil removal tank, a PH sensing probe is arranged in the oil removal tank to detect the acidity in the oil removal tank in real time, and the control system compares the pH value fed back by the PH sensing probe with a preset pH value to regulate the acid value of the grease wastewater. Opening and closing of the first control pipeline and the second control pipeline are controlled. The first control pipeline is a main supplement flow path of sulfuric acid and is provided with a first electric stop valve and a needle valve, when a small amount of sulfuric acid needs to be added into the oil removal tank, the first control pipeline is independently started, and the needle valve can accurately control the amount of the added sulfuric acid; the first control pipeline is a secondary supplement flow path of sulfuric acid, when a large amount of sulfuric acid needs to be added into the oil removal pool, the first control pipeline and the second control pipeline are started at the same time, the needed sulfuric acid is rapidly supplemented on the premise that the working capacity of the needle valve is not affected, and then the purpose of finely regulating and controlling the amount of the sulfuric acid is achieved.

Description

Technical Field

[0001] The utility model relates to an oil wastewater treatment system, in particular to an oil wastewater acid value self-regulation system. Background Art

[0002] In the process of treating oil wastewater, adding acid is an essential technological process. By adding sulfuric acid, the pH value of the wastewater is reduced, promoting the hydrolysis and separation of oil, removing the floating oil on the surface, and creating favorable conditions for subsequent treatment. The oil in the oil removal tank is usually in a flowing state, and the pH value of the incoming water ranges from weak acid to strong base. The pH value of the oil removal tank fluctuates greatly, requiring manual detection at regular intervals, and then adjusting the frequency and time of the acid addition metering pump according to the detection results through a relay. However, the asynchronous time of manual detection and adjustment will cause poor acid addition effect or acid overdose. In addition, due to the frequent start and stop of the metering pump, the diaphragm of the metering pump needs to be replaced frequently, resulting in high maintenance costs and continuous waste of labor. Content of the Utility Model

[0003] To solve the above technical problems, the utility model provides an oil wastewater acid value self-regulation system, including a sulfuric acid source for supplying sulfuric acid;

[0004] An oil removal tank for storing oil wastewater to be acidified, wherein a pH induction probe is arranged in the oil removal tank to detect the pH value in the oil removal tank in real time;

[0005] A first control pipeline and a second control pipeline are connected in parallel between the sulfuric acid source and the oil removal tank; a needle valve and a first electric cut-off valve are connected to the first control pipeline, and a second electric cut-off valve is connected to the second control pipeline;

[0006] And a control system, the first electric cut-off valve, the second electric cut-off valve and the induction probe are electrically connected to the control system, comparing the pH value b detected by the induction probe with the critical pH values a1 and a2, and a1 < a2. When b < a1, the first electric cut-off valve and the second electric cut-off valve are closed; when b > a2, the first electric cut-off valve and the second electric cut-off valve are both opened; when a1 ≤ b ≤ a2, the first electric cut-off valve is opened and the second electric cut-off valve is closed.

[0007] Furthermore, an electric butterfly valve is included, and the electric butterfly valve is connected to the sulfuric acid outlet of the sulfuric acid source for controlling the on-off of the sulfuric acid of the sulfuric acid source.

[0008] Furthermore, the electric butterfly valve is electrically connected to the control system, and when b < a1, the electric butterfly valve is closed.

[0009] Furthermore, the critical pH value a1 is 4 and a2 is 7.

[0010] Furthermore, the sulfuric acid source includes a sulfuric acid tank and a transfer tank connected in series, and the sulfuric acid tank and the transfer tank are connected by an acid pump.

[0011] Furthermore, the sulfuric acid level in the transfer tank is higher than the level in the oil removal tank.

[0012] This invention provides a self-regulating acid value system for oily wastewater. A first control pipeline and a second control pipeline are connected in parallel between the sulfuric acid source and the oil removal tank. A pH sensor is installed in the oil removal tank to detect the acidity in real time. The control system compares the acid-base value fed back by the pH sensor with a preset acid-base value and controls the opening and closing of the first and second control pipelines. The first control pipeline is the main replenishment path for sulfuric acid and is equipped with a first electric shut-off valve and a needle valve. When a small amount of sulfuric acid needs to be added to the oil removal tank, the first control pipeline is activated independently, and the needle valve can precisely control the amount of sulfuric acid added. The first control pipeline is also a secondary replenishment path for sulfuric acid. When a large amount of sulfuric acid needs to be added to the oil removal tank, both the first and second control pipelines are activated simultaneously. This allows for rapid replenishment of the required sulfuric acid without affecting the working capacity of the needle valve, thereby achieving precise control of the sulfuric acid quantity. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a self-regulating acid value system for oily wastewater according to the present invention.

[0014] Attached reference numerals: 1. Sulfuric acid tank; 2. Acid pump; 3. Transfer tank; 4. Electric butterfly valve; 5. First control pipeline; 6. Second control pipeline; 7. pH sensor probe; 8. Needle valve; 9. First electric shut-off valve; 10. Second electric shut-off valve; 11. Oil removal tank. Detailed Implementation

[0015] like Figure 1The illustrated self-regulating acid value system for oily wastewater includes a sulfuric acid source, an electric butterfly valve 4, a first control pipeline 5, a second control pipeline 6, and an oil removal tank 11. The sulfuric acid source is the total supply source of sulfuric acid required for oil removal from the wastewater. The oil removal tank 11 is filled with the oily wastewater to be treated, and sulfuric acid flows into the oil removal tank 11. A pH sensing probe 7 is installed inside the oil removal tank 11, extending below the liquid surface to sense the acidity or alkalinity of the oily wastewater in the oil removal tank 11 in real time. The principle of the pH sensing probe 7 is that when the glass electrode is submerged below the surface of the liquid to be tested, hydrogen and oxygen ions in the solution undergo ion exchange with the glass membrane, generating a potential difference. This potential difference is proportional to the hydrogen ion concentration in the solution, and the real-time acidity or alkalinity is obtained through the difference in potential. An electric butterfly valve 4 is connected to the downstream side of the sulfuric acid source to control the outflow of sulfuric acid. The first control pipeline 5 and the second control pipeline 6 are connected in parallel between the electric butterfly valve 4 and the oil removal tank 11 via a DN15 pipe. The first control pipeline 5 includes a needle valve 8 and a first electric shut-off valve 9 connected to the pipeline. The first electric shut-off valve 9 is used to control the flow of sulfuric acid in the first control pipeline 5. The needle valve 8 is used to precisely regulate the flow rate of sulfuric acid through the first control pipeline 5. Technicians can adjust the opening of the needle valve 8 in advance according to the actual situation. A second electric shut-off valve 10 is provided on the second control pipeline 6 to control the flow of sulfuric acid in the second control pipeline 6.

[0016] It also includes a control system. The induction butterfly valve, the first electric shut-off valve 9, the second electric shut-off valve 10, and the induction probe are electrically connected to the control system. The pH induction probe 7 automatically detects the acid and alkalinity of the oil removal tank 11 and compares it with the preset critical acid and alkalinity. The butterfly valve, the first electric shut-off valve 9, and the second electric shut-off valve 10 are controlled to open and close according to the different comparison results of the pH induction probe 7, so as to introduce sulfuric acid into the oil removal tank 11.

[0017] Specifically, the detected pH value is b, the critical pH values are a1 and a2, and a1 < a2. The acidity of a2 is less than that of a1. When the detected pH value b is less than a1, the amount of sulfuric acid in the degreasing tank 11 is relatively high, and no sulfuric acid needs to be replenished. The control system controls the induction butterfly valve, the first electric stop valve 9, and the second electric stop valve 10 to close, preventing excessive addition of sulfuric acid and causing too high acid value in the degreasing tank 11. When the detected pH value b is not less than a1 and not greater than a2, a small amount of sulfuric acid needs to be replenished in the degreasing tank 11. The induction butterfly valve and the first electric stop valve 9 are controlled to open, and the second electric stop valve 10 is closed. Only the first control pipeline 5 replenishes sulfuric acid into the degreasing tank 11, and the needle valve 8 can accurately adjust the flow rate of sulfuric acid replenishment. When the detected pH value b is greater than a2, a large amount of sulfuric acid needs to be replenished. At this time, the induction butterfly valve, the first electric stop valve 9, and the second electric stop valve 10 are opened, and the first control pipeline 5 and the second control pipeline 6 replenish sulfuric acid simultaneously to ensure that the acid value in the degreasing tank 11 will not be too low. Due to the replenishment of sulfuric acid by the second control pipeline 6, the needle valve 8 can maintain its initial opening, playing a role in accurately controlling the flow rate and pressure, and no additional frequent adjustment is required.

[0018] In this embodiment, a1 is selected as 4, and the acidity of this critical value is relatively strong; a2 is selected as 7, and this critical value is neutral, indicating that the sulfuric acid in the degreasing tank 11 is insufficient.

[0019] Further, the sulfuric acid source includes a sulfuric acid tank 1 and a transfer tank 3 connected in series. The sulfuric acid tank 1 and the transfer tank 3 are connected by an acid adding pump 2. When the acid adding pump 2 is opened, the transfer tank 3 is filled, and the usage amount for 8 - 10 days is pre - stored. During these 8 - 10 days, only the pH value of the degreasing tank 11 needs to be regularly checked every day and compared with the detection value of the PH induction probe 7, greatly reducing the labor of the staff and the startup time of the acid adding pump 2.

[0020] Further, the liquid level height of the sulfuric acid in the transfer tank 3 is higher than the liquid level height of the degreasing tank 11. The opening and closing of the sulfuric acid in the transfer tank 3 are controlled by an electric butterfly valve 4. When the electric butterfly valve 4 is opened, the sulfuric acid can automatically flow to the first control pipeline 5 and the second control pipeline 6 under the action of gravity.

[0021] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limitations to the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A self-regulating system for acid value of grease wastewater, characterized in that: The sulfuric acid source is connected with the oil removing tank (11) through a first control pipeline (5) and a second control pipeline (6). The sulfuric acid source is connected with the oil removing tank (11) through a first control pipeline (5) and a second control pipeline (6). The first control pipeline (5) is connected with a needle valve (8) and a first electric stop valve (9), and the second control pipeline (6) is connected with a second electric stop valve (10). The first electric stop valve (9) and the second electric stop valve (10) are electrically connected with the control system.

2. The oil wastewater acid value self-regulating system of claim 1, wherein: The first electric stop valve (9) and the second electric stop valve (10) are closed when b < a1, and are opened when b > a2.

3. The self-regulating system for acid value of grease wastewater according to claim 2, characterized in that: The electric butterfly valve (4) is connected with the sulfuric acid outlet of the sulfuric acid source, and is used for controlling the on-off of the sulfuric acid source.

4. The oil wastewater acid value self-regulating system of claim 1, wherein: The electric butterfly valve (4) is electrically connected with the control system, and is closed when b < a1.

5. The oil wastewater acid value self-regulating system of claim 1, wherein: The critical pH value a1 is 4, and the critical pH value a2 is 7.

6. The oil wastewater acid value self-regulating system of claim 5, wherein the acid value of the oil wastewater is controlled to be 0.5 to 2 mgKOH / g. The sulfuric acid source comprises a sulfuric acid tank (1) and a transfer tank (3) connected in series. The liquid level of the sulfuric acid in the transfer tank (3) is higher than the liquid level of the oil removing tank (11).

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