Wastewater neutralizing device for low-speed dual-fuel engine of ship

Abstract

The invention discloses a waste water neutralizing device for a low-speed dual-fuel engine of a ship, interfaces of the device comprise a waste water inlet, an alkali liquor filling port, a ventilation port, a normal discharge pipe, an emergency overflow port and a residue discharge port, the appearance of the device is circular equipment, and two partition plates are arranged in the device to divide a container into three chambers; in addition, a PH meter and an electromagnetic flowmeter are further installed and used for controlling filling of alkali liquor. According to the device, mixing can be performed in the neutralizing device only by relying on gravitational potential energy of discharged wastewater, a mixing path of the wastewater and alkali liquor is added, and the wastewater is continuously stirred in the device by relying on the gravitational potential energy of the wastewater, so that the wastewater is fully neutralized. The device can provide an accurate and timely wastewater flow value and a pH value of neutralized wastewater, and is used for closed-loop control of alkali liquor dosage.

Description

Technical Field

[0001] The invention relates to the field of wastewater treatment of an EGR system of a low-speed dual-fuel ship engine, and in particular to a wastewater neutralization device for a low-speed dual-fuel ship engine. Background Art

[0002] The EGR system (also known as iCER) of a ship's low-speed dual-fuel engine will generate a large amount of acidic oily wastewater during operation. This wastewater needs to be treated by a water treatment device to reduce the oil content to less than 15ppm in order to meet the requirements of the International Maritime Organization (IMO) for EGR wastewater discharge. At present, the air flotation water treatment system has been used in the field of EGR wastewater treatment, but the air flotation water treatment system needs to have a pH value greater than 8 to achieve a better treatment effect. Therefore, when using the air flotation water treatment system, a wastewater neutralization device is required to synthesize weakly acidic wastewater into weakly alkaline before entering the water treatment system for treatment.

[0003] The original neutralization device was designed as a single rectangular cabinet with no internal structure. Wastewater entered the cabinet from the side, and alkali solution was directly added to the neutralization rectangular cabinet without pre-mixing. The alkali solution and wastewater were mixed unevenly and insufficiently. The pH meter could not reflect the actual acid-base state in the cabinet, resulting in excessive or insufficient alkali solution addition, which affected the normal operation of the water treatment device. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a wastewater neutralization device for low-speed dual-fuel engines of ships. After the alkali solution is pre-mixed at the wastewater inlet, it is added to the neutralization device from the top. After the wastewater passes through several layers of partitions in the neutralization device, it is evenly mixed with the alkali solution, which improves the accuracy of pH detection and better controls the amount of alkali solution added, ensuring the normal operation of the water treatment device.

[0005] The purpose of the present invention is achieved by the following technical solutions:

[0006] A wastewater neutralization device for a low-speed dual-fuel engine of a ship, comprising a housing and a wastewater inlet and an alkali solution filling port arranged on the housing, characterized in that an upper baffle and a lower baffle with a water plate level are arranged in sequence from top to bottom inside the housing, so that the interior of the housing is divided into three chambers;

[0007] The upper partition is provided with an opening, which makes the wastewater flow rate less than 0.5m / s and the position of the opening is located on the side away from the wastewater inlet; the lower partition is provided with an opening, which makes the wastewater flow rate less than 1m / s and the position of the opening is located on the side away from the opening of the upper partition.

[0008] The wastewater inlet is arranged at the top of the shell, and the alkali solution filling port is welded on the side of the wastewater inlet located outside the shell, so that the alkali solution is pre-mixed with the wastewater at the wastewater inlet. A normal discharge pipe is arranged at the bottom of the shell.

[0009] An electromagnetic flowmeter is installed on the normal discharge pipe.

[0010] An emergency overflow port is provided on the side of the upper part of the shell, the lower part of which is connected to the normal discharge pipe and has a larger diameter than the normal discharge pipe. When the waste water is too large to be discharged from the normal discharge pipe in time, part of the waste water can be discharged from the emergency overflow port.

[0011] The normal discharge pipe first has a lower horizontal pipe section, then a vertical pipe section, and then a higher horizontal pipe section.

[0012] An electromagnetic flowmeter is installed on the lower horizontal pipe section of the normal discharge pipe.

[0013] A residual discharge port and a manual ball valve are arranged on the side of the lower part of the shell.

[0014] A pH meter is provided on the side surface of the lower portion of the housing.

[0015] A vent is arranged on the top of the shell.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The alkali solution is premixed with the wastewater at the wastewater inlet. Since the wastewater inlet flow rate is fast, a better premixing effect can be achieved, so that the wastewater and alkali solution can fully undergo a neutralization reaction before entering the device.

[0018] After the wastewater and alkali solution are pre-mixed, they fall vertically onto the upper baffle of the device. Since the wastewater has a certain gravitational potential energy, a better mixing effect is achieved through the impact of the wastewater and the upper baffle. The long distance between the wastewater inlet and the opening of the upper baffle can make the wastewater flow through a longer path, and the long distance between the opening of the upper baffle and the opening of the lower baffle can also make the wastewater flow through a longer path, so that the wastewater and alkali solution can fully undergo a neutralization reaction.

[0019] The pH sensor is installed in the cavity below the lower partition to more accurately measure the pH value of the fully mixed wastewater. The electromagnetic flowmeter is installed on the horizontal pipe section of the normal discharge pipeline and there is a vertical pipe section behind the horizontal pipe section, which can ensure that the flowmeter pipe section is always full of water to avoid bubbles in the pipeline affecting the measurement of the electromagnetic flowmeter. Accurate pH value and wastewater flow can make the control of alkali solution dosing more stable and accurate, which is conducive to the normal operation of the water treatment device.

[0020] The emergency overflow port is connected to the side of the upper cavity of the neutralization device. The diameter of the emergency overflow port is larger than that of the normal discharge pipe. When the wastewater has a large flow rate, it is too late to discharge from the normal discharge pipe. Part of the wastewater can be discharged from the device from the emergency overflow port to prevent the instantaneous large flow of wastewater from forming a water column above the device and exerting a large pressure on the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the front view of the present invention.

[0022] Figure 2 It is the positive triaxial projection of the present invention.

[0023] Figure 3 It is a top view of the present invention.

[0024] Figure 4 for Figure 1 AA section view.

[0025] Figure 5 for Figure 1 BB cross-sectional view.

[0026] In the figure: 1 is the wastewater inlet, 2 is the alkali solution filling port, 3 is the air vent, 4 is the normal discharge pipe, 5 is the emergency overflow port, 6 is the residual discharge port, 7 is the upper partition, 8 is the lower partition, 9 is the pH meter, and 10 is the electromagnetic flow meter. DETAILED DESCRIPTION

[0027] The following is a detailed description of the embodiments of the present invention: This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

[0028] See also Figure 1 and Figure 2 , a wastewater neutralization device for a low-speed dual-fuel ship engine, comprising a wastewater inlet 1, an alkali solution filling port 3, a vent port 3, a normal discharge pipe 4, an emergency overflow port 5, a residual discharge port 6, an upper baffle 7, a lower baffle 8, a pH meter 9 and an electromagnetic flowmeter 10. Among them:

[0029] Inside the shell, a horizontal upper partition 7 and a lower partition 8 are arranged from top to bottom, so that the inside of the shell is divided into three chambers;

[0030] The upper partition plate 7 is provided with an opening, which makes the wastewater flow rate less than 0.5m / s and the position of the opening is located on the side away from the wastewater inlet 1; the lower partition plate 8 is provided with an opening, which makes the wastewater flow rate less than 1m / s and the position of the opening is located on the side away from the opening of the upper partition plate 7.

[0031] The wastewater inlet 1 is arranged at the top of the shell, and the alkali solution filling port 2 is welded to the side of the wastewater inlet 1 located outside the shell, so that the alkali solution is pre-mixed with the wastewater at the wastewater inlet 1.

[0032] A normal discharge pipe 4 is provided at the bottom of the housing.

[0033] An electromagnetic flowmeter 10 is installed on the normal discharge pipe 4 .

[0034] An emergency overflow port 5 is provided on the side of the upper part of the shell, the lower part of which is connected to the normal discharge pipe 4 and has a larger diameter than the normal discharge pipe 4. When the waste water is too large to be discharged from the normal discharge pipe 4 in time, part of the waste water can be discharged from the emergency overflow port 5.

[0035] The normal discharge pipe 4 first has a lower horizontal pipe section, then a vertical pipe section, and then a higher horizontal pipe section.

[0036] An electromagnetic flowmeter 10 is installed on the lower horizontal pipe section of the normal discharge pipe 4 .

[0037] A residual outlet 6 and a manual ball valve are provided on the side of the lower part of the shell.

[0038] A pH meter 9 is provided on the side surface of the lower portion of the housing.

[0039] A vent 3 is provided on the top of the shell.

[0040] Working principle of the present invention:

[0041] The alkali solution is premixed with the wastewater at the wastewater inlet. Due to the high flow rate of the wastewater inlet, a better premixing effect can be achieved. After the wastewater and alkali solution are premixed, they fall vertically onto the upper baffle of the device. Since the wastewater has a certain gravitational potential energy, a better mixing effect is achieved through the impact of the wastewater and the upper baffle. The long distance between the wastewater inlet and the opening of the upper baffle can make the wastewater flow through a longer path for better mixing. The long distance between the opening of the upper baffle and the opening of the lower baffle also makes the wastewater flow through a longer path for better mixing. The pH meter installed in the cavity at the bottom of the lower baffle can more accurately measure the pH value of the fully mixed wastewater. The electromagnetic flowmeter is installed on the horizontal pipe section of the normal discharge pipeline and there is a vertical pipe section behind the horizontal pipe section. This can ensure that the flowmeter pipe section is always full of water to avoid bubbles in the pipeline affecting the measurement of the electromagnetic flowmeter. Accurate pH value and wastewater flow rate can make the control of alkali solution dosing more stable and accurate, which is conducive to the normal operation of the water treatment device. The emergency overflow port is connected to the side of the upper cavity of the neutralization shell. The diameter of the emergency overflow port is larger than the normal discharge port. When the wastewater flow is large, the wastewater has no time to be discharged from the normal discharge port. Part of the wastewater can be discharged from the device from the emergency overflow port to prevent the instantaneous large flow of wastewater from forming a water column above the device and exerting a large pressure on the device.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wastewater neutralization device for a low-speed dual-fuel ship engine, comprising a housing and a wastewater inlet (1) and an alkali solution filling port (2) arranged on the housing, characterized in that: An upper partition (7) and a lower partition (8) are arranged horizontally from top to bottom inside the shell, so that the inside of the shell is divided into three chambers; The upper baffle (7) is provided with an opening, which makes the wastewater flow rate less than 0.5 m / s and the position of the opening is located on a side away from the wastewater inlet (1); the lower baffle (8) is provided with an opening, which makes the wastewater flow rate less than 1 m / s and the position of the opening is located on a side away from the opening of the upper baffle (7).

2. The wastewater neutralization device for a low-speed dual-fuel ship engine according to claim 1, characterized in that: The wastewater inlet (1) is arranged at the top end of the shell, and the alkali solution filling port (2) is welded to the side of the wastewater inlet (1) located outside the shell, so that the alkali solution is pre-mixed with the wastewater at the wastewater inlet (1).

3. The wastewater neutralization device for a low-speed dual-fuel ship engine according to claim 1, characterized in that: A normal discharge pipe (4) is provided at the bottom of the housing.

4. The wastewater neutralization device for a low-speed dual-fuel ship engine according to claim 3, characterized in that: An electromagnetic flowmeter (10) is installed on the normal discharge pipe (4).

5. The wastewater neutralization device for a low-speed dual-fuel ship engine according to claim 1, characterized in that: An emergency overflow port (5) is provided on the side surface of the upper portion of the shell, the lower portion of the emergency overflow port (5) is connected to the normal discharge pipe (4) and the pipe diameter is larger than that of the normal discharge pipe (4). When the waste water is too large to be discharged from the normal discharge pipe (4) in time, a portion of the waste water can be discharged from the emergency overflow port (5).

6. The wastewater neutralization device for a low-speed dual-fuel ship engine according to claim 5, characterized in that: The normal discharge pipe (4) first has a lower horizontal pipe section, then is connected to a vertical pipe section, and then is connected to a higher horizontal pipe section.

7. The wastewater neutralization device for a low-speed dual-fuel ship engine according to claim 6, characterized in that: An electromagnetic flowmeter (10) is installed on the lower horizontal pipe section of the normal discharge pipe (4).

8. The wastewater neutralization device for a low-speed dual-fuel ship engine according to claim 1, characterized in that: A residual discharge port (6) and a manual ball valve are provided on the side of the lower part of the shell.

9. The wastewater neutralization device for a low-speed dual-fuel ship engine according to claim 1, characterized in that: A pH meter (9) is provided on the side surface of the lower part of the housing.

10. The wastewater neutralization device for a low-speed dual-fuel ship engine according to claim 1, characterized in that: The top of the shell is provided with a vent (3).

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