Alkali liquor neutralization unit

Abstract

The utility model discloses an alkali liquor neutralizing unit which comprises a collecting cabinet, a neutralizing cabinet and a siphon pipeline, wherein the collecting cabinet is used for collecting acidic condensate water from a host air cooler and overflow water from exhaust gas recirculation; the neutralizing cabinet is used for filling alkali liquor and neutralizing the condensate water and the overflow water; and the siphon pipeline is used for communicating the collecting cabinet with the neutralizing cabinet. According to the utility model, non-quantitative host condensate water and washing water for exhaust gas recirculation are neutralized to be neutral by alkali liquor. Due to the fact that the flow of a neutralization water source changes greatly due to different seasons and different host powers, the neutralization effect is prone to being poor, and due to the fact that the neutralization effect is required to be 8-10 in the follow-up water treatment process, the difficulty that the neutralization effect needs to be strictly controlled is large. According to the device disclosed by the utility model, an unquantitative neutralization water source is converted into a quantitative water source for neutralization, so that the amount of added alkali liquor is quantitative, and the neutralization effect is completely controlled to be pH 8-10.

Description

Technical Field

[0001] The utility model relates to an alkali liquid neutralization unit for neutralizing acidic waste liquid of a ship, belonging to the technical field of special equipment for ships. Background Art

[0002] With the increasing improvement of ship regulations and the increasing requirements for environmental protection, the application share of ship dual-fuel main engines has gradually increased. To meet the environmental protection requirements and improve the economic benefits of the main engine, the exhaust gas recirculation system of ships has gradually been applied in the dual-fuel main engine market, achieving the effects of energy conservation, emission reduction and economic benefit improvement. In addition, it can also reduce the consumption of NO x to meet the requirements of IMO regulation TierⅢ. The exhaust gas recirculation system is to wash and cool a part of the flue gas of the main engine, mix it with fresh air, and enter the scavenging air box through the supercharger. Considering the material cost and the impact on the main engine, fresh water is used for washing. The water in the circulation tank is pumped into the washing tower through the heat exchanger by the circulation pump for washing and cooling. Since the exhaust gas after combustion of the dual-fuel main engine contains a high water content, after cooling, the water volume in the circulation tank will increase in the cycle, so the circulating water will continuously overflow. During the washing process, the circulating water will also wash down SO x 、NO x 、CO 2 、oil and other substances to form sulfurous acid, nitric acid, carbonic acid, etc. Therefore, the overflowing water is acidic and the oil content exceeds the standard. The condensate water of the main engine is also acidic and the oil content exceeds the standard due to the exhaust gas recirculation. According to the requirements of IMO regulations, the washing water of the exhaust gas recirculation needs to be treated before discharge. Therefore, the neutralization of the overflowing water and the condensate water is very important. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide an alkali liquid neutralization unit for neutralizing acidic waste liquid of a ship.

[0004] To solve the above technical problem, the utility model provides an alkali liquid neutralization unit, which includes a collection tank for collecting condensate water from the main engine air cooler and overflowing water from the exhaust gas recirculation, both of which are acidic, a neutralization tank for adding alkali liquid and neutralizing the condensate water and the overflowing water, and a siphon pipeline for connecting the collection tank and the neutralization tank.

[0005] Preferably, both ends of the siphon pipeline are arranged below the liquid level and close to the bottom in the collection tank and the neutralization tank respectively.

[0006] Preferably, the collection tank is provided with a water inlet hole for inlet of condensate water or overflowing water.

[0007] Preferably, the collection tank is provided with a ventilation hole.

[0008] Preferably, the collection cabinet is provided with a high liquid level switch and a low liquid level switch.

[0009] Preferably, the neutralization cabinet is partitioned by a partition into a liquid inlet area and a liquid outlet area. The liquid inlet area is provided with an alkali solution filling pipe and a stirring mechanism. The liquid outlet area is provided with a mixing pipe communicating with the liquid inlet area. A vane plate is arranged in the mixing pipe, and a drain pipe is provided at the bottom of the liquid outlet area.

[0010] More preferably, a pH meter is provided in the liquid outlet area of the neutralization cabinet.

[0011] More preferably, a breather pipe is provided in the liquid outlet area of the neutralization cabinet.

[0012] More preferably, the stirring mechanism includes a motor, a speed reducer and stirring blades.

[0013] Preferably, a breather pipeline is provided on the siphon pipeline, and a solenoid valve is provided on the breather pipeline.

[0014] The present utility model is a neutralization method for an acid-base neutralization utility model of exhaust gas recirculation, mainly for neutralizing the condensate water from the main engine air cooler and the washing water of exhaust gas recirculation with an alkali solution to neutral. Since the flow rate of the neutralization water source varies greatly due to different seasons and different main engine powers, it is easy to cause poor neutralization effect. And due to the requirements of subsequent water treatment, the neutralization effect is within pH 8 - 10, so it is difficult to strictly control the neutralization effect. The present utility model converts the variable neutralization water source into a fixed amount of water source for neutralization, so that the amount of alkali solution added is fixed, and the neutralization effect is completely controlled within pH 8 - 10. Brief Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the alkali solution neutralization unit provided by the present utility model. Detailed Description of the Preferred Embodiment

[0016] To make the present utility model more obvious and understandable, the preferred embodiments are described in detail below in conjunction with the accompanying drawings.

[0017] Embodiment

[0018] As Figure 1 shown, it is an alkali solution neutralization unit provided by the present utility model, which includes a collection cabinet 1 for collecting the condensate water from the main engine air cooler and the overflow water from the exhaust gas recirculation, both of which are acidic, a neutralization cabinet 3 for filling the alkali solution and neutralizing the condensate water and the overflow water, and a siphon pipeline 2 for connecting the collection cabinet 1 and the neutralization cabinet 3.

[0019] Both ends of the siphon pipeline 2 are respectively arranged below the liquid level and near the bottom in the collection cabinet 1 and the neutralization cabinet 3. A breather pipeline 22 is provided on the siphon pipeline 2, and a solenoid valve 21 is provided on the breather pipeline 22.

[0020] The collection cabinet 1 is provided with a water inlet hole 14 for inlet of condensed water or overflow water. The collection cabinet 1 is provided with a ventilation hole 13. The collection cabinet 1 is provided with a high liquid level switch b and a low liquid level switch a.

[0021] The neutralization cabinet 3 is divided into a liquid inlet area and a liquid outlet area by a partition plate 35. The liquid inlet area is provided with an alkali liquid filling pipe 34 and a stirring mechanism. The liquid outlet area is provided with a mixing pipe 39 communicating with the liquid inlet area. A blade plate is arranged in the mixing pipe 39. A drain pipe 38 is provided at the bottom of the liquid outlet area. A pH meter 37 is provided in the liquid outlet area of the neutralization cabinet 3. A vent pipe 36 is provided in the liquid outlet area of the neutralization cabinet 3. The stirring mechanism includes a motor 31, a speed reducer 32 and stirring blades 33.

[0022] The collection cabinet 1 is mainly used to collect the condensed water from the acidic main engine air cooler and the overflow water from the exhaust gas recirculation. The cabinet is provided with a ventilation hole 13, and high and low liquid level switches 12 and 11. The collection cabinet 1 and the neutralization cabinet 3 are connected by a siphon pipe 2. The siphon pipeline 2 is respectively arranged below the liquid levels of the collection cabinet 1 and the neutralization cabinet 3, that is, the pipeline in the collection cabinet 1 is arranged below the low liquid level switch a, and the pipeline of the neutralization cabinet 3 is arranged below the drain port 38. A vent pipeline 22 is arranged at the middle position of the siphon pipeline 2, and an electric valve 21 controls the on-off of this pipeline. The middle of the neutralization cabinet 2 is divided into two smaller spaces by a partition board 35. The top of the partition board 35 is connected to a mixing pipeline 39. A blade plate is arranged inside the mixing pipeline 39 to play a role in further mixing evenly. The liquid inlet area of the neutralization cabinet 3 ( Figure 1 the left side in the figure) is arranged with the insertion end of the siphon pipeline 2, the alkali liquid filling pipe 34 and the stirring mechanism; the liquid outlet area of the neutralization cabinet 3 ( Figure 1 the right side in the figure) is arranged with the mixing pipe 39, the vent pipe 36, the pH meter 37 and the drain pipe 38. The port of the siphon pipeline 2 in the collection cabinet 1 is higher than its port in the neutralization cabinet 3. The port of the siphon pipeline 2 in the neutralization cabinet 3 is close to the bottom of the neutralization cabinet 3. The mixing pipe 39 is arranged at the top of the neutralization cabinet 3 and is attached to the partition board 35.

[0023] Working principle: The condensate water of the main engine air cooler and the overflow water of the exhaust gas recirculation are mixed on the pipeline before the collection cabinet 1, or enter the collection cabinet 1 separately. The liquid level of the collection cabinet 1 gradually rises. When the liquid level exceeds the height of the siphon pipeline 2, the water in the collection cabinet 1 starts to overflow into the neutralization cabinet 2. At this time, the electric valve 21 is in the closed state. When the siphon pipeline 2 is full of water, siphon starts to occur. At this time, the flow rate into the neutralization cabinet 3 is a fixed value, which is the full pipe water volume of the siphon pipeline 2. At this time, the lye filling amount is quantitatively filled through the lye filling pipe 34 according to the full pipe water volume. The stirring mechanism starts to stir when the lye is filled. When the liquid level in the liquid inlet area of the neutralization cabinet 3 rises to the height of the mixing pipe 39, the liquid is further mixed through the mixing pipe 39 and then enters the liquid outlet area of the neutralization cabinet 3. The pH value of the liquid is detected in the liquid outlet area and the lye filling amount is appropriately adjusted. When the liquid level in the liquid inlet area is higher than the position of the drain port 38, draining starts. When the liquid level of the collection cabinet 1 drops to the low liquid level switch a, the electric valve 21 opens and the siphon stops at this time.

Claims

1. An alkali solution neutralization unit, characterized in that The invention comprises a collecting cabinet (1) for collecting acidic condensed water from a main engine air cooler and overflow water from exhaust gas recirculation, a neutralizing cabinet (3) for adding alkaline solution and neutralizing the condensed water and overflow water, and a siphon pipeline (2) for connecting the collecting cabinet (1) and the neutralizing cabinet (3).

2. The alkali solution neutralization unit according to claim 1, characterized in that The two ends of the siphon pipeline (2) are respectively arranged below the liquid surface and close to the bottom in the collection cabinet (1) and the neutralization cabinet (3).

3. The alkali solution neutralization unit according to claim 1, characterized in that The collection cabinet (1) is provided with a water inlet hole (14) for inletting condensed water or overflow water.

4. The alkali solution neutralization unit according to claim 1, characterized in that The collection cabinet (1) is provided with an air vent (13).

5. The alkali solution neutralization unit according to claim 1, characterized in that The collection cabinet (1) is provided with a high liquid level switch (b) and a low liquid level switch (a).

6. The alkali solution neutralization unit according to claim 1, characterized in that The neutralization cabinet (3) is divided into a liquid inlet area and a liquid outlet area by a partition (35). The liquid inlet area is provided with an alkali solution filling pipe (34) and a stirring mechanism. The liquid outlet area is provided with a mixing pipe (39) connected to the liquid inlet area. A blade plate is arranged in the mixing pipe (39). A discharge pipe (38) is provided at the bottom of the liquid outlet area.

7. The alkali solution neutralization unit according to claim 6, characterized in that A pH meter (37) is provided in the liquid outlet area of ​​the neutralization cabinet (3).

8. The alkali solution neutralization unit according to claim 6, characterized in that The liquid outlet area of ​​the neutralization cabinet (3) is provided with a vent pipe (36).

9. The alkali solution neutralization unit according to claim 6, characterized in that The stirring mechanism comprises a motor (31), a reducer (32) and a stirring blade (33).

10. The alkali solution neutralization unit according to claim 1, characterized in that The siphon pipeline (2) is provided with a vent pipeline (22), and the vent pipeline (22) is provided with a solenoid valve (21).

Images