CN111389211A - Wastewater energy recycling system of ship desulfurization device - Google Patents

Abstract

The invention discloses a waste water energy reuse system of a ship desulfurization device. The system mainly comprises: a valve box, a first-stage seawater pump, a second-stage first seawater pump, a second-stage second seawater pump, a second-stage third seawater pump, and a washing machine. Tower seawater inlet, washing tower, waste water collection port, turbine, transmission shaft, waste water outlet. The main purpose of the present invention is to use the potential energy contained in the wastewater generated by the desulfurization device to convert the potential energy contained in the wastewater into mechanical energy, and then The converted mechanical energy is used to pressurize the seawater for the first time through the first-stage seawater pump, thereby greatly reducing the overall power consumption of the ship's open system. The invention has the advantages of ingenious design, simple method, easy realization, huge amount of recovered energy and high market share, therefore, its application significance and prospect are great.

Description

A system for reusing waste water energy of ship desulfurization device

technical field

The invention belongs to the technical field of ships, and in particular relates to a waste water energy recycling system of a ship desulfurization device.

Background technique

With the increasing international trade cooperation, the number of ocean-going ships is increasing day by day. Among them, the vast majority of ocean-going ships use diesel engines as main power devices, and most marine diesel engines use cheap heavy oil as fuel oil. Although the burning of heavy oil can effectively save the fuel cost of ships, the heavy oil contains high sulfur content, and the exhaust gas containing sulfur oxides (SO _X ) produced after combustion has caused serious pollution to the environment. In response to this problem, the International Maritime Organization (IMO) has stipulated that from January 1, 2020, the sulfur content in exhaust gas emitted by ships will not exceed 0.5% globally.

At present, in the face of strict ship sulfur emission restrictions, ship owners mainly take three measures: burning low-sulfur fuel oil, burning liquefied natural gas (LNG) and installing desulfurization tower exhaust gas cleaning system (EGCS) on ships. However, due to the high price of low-sulfur fuel oil, LNG as a fuel has relatively high technological requirements, and the cost of installing EGCS is relatively small. Therefore, in recent years, most ships have chosen to install EGCS. The EGCS of ships is divided into open system, closed system and hybrid system. Among them, the most widely used on ships is the open system.

In the open system, the seawater in the ocean is pumped into the desulfurization tower and sprayed in the desulfurization tower, and reacts with the flue gas flowing through the desulfurization tower. The sulfide-laden sea water becomes waste water and is discharged to the sea. Due to no need to add chemicals, the system is simple and easy to manage, the open system has become the most popular desulfurization method at this stage.

At the same time, the open system also has a relatively prominent problem: the operating power of the seawater supply pump is relatively large, and the power consumption of the system during operation is very large. The reason is that the lift and flow of the seawater supply pump are very large, and the desulfurization tower is installed near the chimney, and the position is very high, which requires the seawater supply pump to have a large lift, and at the same time, the power of the diesel engine is very large, resulting in the seawater supply pump. traffic is large. For example, the height of the desulfurization tower of a large ore carrier from the sea level is about 20m, the flow rate of the seawater supply pump is about 1000m ³ /h, and the operating power of the seawater supply pump can exceed 200KW. Large container ships have higher freeboard and higher main engine power. The height of the desulfurization tower from the sea level can reach 30m, the seawater supply flow is about 2000m ³ /h, and the power of the seawater supply pump is as high as 400KW. Therefore, although the open system is a better desulfurization method, it consumes a lot of power in the exhaust gas purification process. These power consumptions cause the ship to generate more exhaust gas to a certain extent, which is contrary to the general trend of energy saving and emission reduction. .

In the open system, after the chemical reaction of seawater spraying, the generated wastewater will be discharged into the sea, and the height difference between the desulfurization tower and the sea level is large, and the height difference is larger when it is empty, so the wastewater is discharged during the discharge process. has a huge potential energy difference. In addition, the flow of wastewater is also very large. As mentioned above, the large container ships can generate 50,000 tons of wastewater every day. Therefore, if the potential energy in these wastewater is utilized, it can provide partial power to the seawater supply pump, and the It can greatly reduce the power consumption of the seawater supply pump, thereby improving the energy-saving and emission-reduction effect of the ship, and most ships now use an open system. Therefore, the above-mentioned energy-saving and emission-reduction method has a very broad application prospect.

SUMMARY OF THE INVENTION

The purpose of the present invention is to address the above-mentioned problems, and propose a ship desulfurization wastewater energy reuse system. The system mainly includes: valve box, primary sea water pump, secondary first sea water pump, secondary second sea water pump, secondary third sea water pump, washing tower sea water inlet, washing tower, waste water collection port, turbine, drive shaft , Wastewater outlet.

Wherein, the water turbine is installed in the waste water pipeline, close to the waste water outlet, and before the waste water outlet. The first-stage sea water pump and the water turbine are connected through a transmission shaft, and the two can realize coaxial rotation.

Two of the secondary first seawater pumps, the secondary second seawater pumps and the secondary third seawater pumps work when the system is running, and the other is used as a backup.

When the ship sails in the open sea, the open system of the ship starts to operate, and the exhaust gas from the ship's diesel engine enters the scrubber from the lower part through the pipeline, and the exhaust gas flows from bottom to top in the scrubber. At the same time, the seawater in the sea is pumped by the seawater pump to the washing tower through the valve box under the suction effect of the seawater pump, and enters the washing tower from the seawater inlet of the washing tower, and then the seawater is sprayed into a mist in the washing tower. , the seawater flows from top to bottom and the exhaust gas flows in the opposite direction for chemical reaction. The washed waste gas is discharged upwards into the atmosphere, and the washed seawater becomes waste water and firstly passes through the waste water collection port of the washing tower, and then the waste water flows down the pipeline. A water turbine is installed in the lower pipe, and the waste water will drive the impeller of the water turbine to rotate, and then be discharged into the sea through the waste water outlet, and the impeller driven by the waste water will drive the first-stage seawater pump connected to the drive shaft to work. At this time, the first-stage seawater pump can initially pressurize the seawater entering the pipeline from the valve box to increase the pressure of the seawater, and then use the second-stage seawater pump to pressurize the seawater into the washing tower for the second time.

Beneficial effects of the present invention:

1. The system of the present invention realizes the utilization of a large amount of potential energy contained in the washing waste water, which not only saves the electric energy consumed by the sea water pump in the process that the sea water is fed into the washing tower, but also directly drives the first-stage sea water pump to work through the water turbine, and directly utilizes the waste water. It avoids the energy loss caused by the intermediate links such as the conversion of potential energy in wastewater into electrical energy, and the conversion of electrical energy into other mechanical energy, and improves the conversion rate of energy.

2. In the present invention, the washing seawater supply port and the washing waste water outlet are respectively located on both sides of the ship, to avoid that the washed waste water may be pumped into the washing tower again when they are on the same side, and the washing effect of seawater is weakened.

3. The present invention has the advantages of ingenious design, simple method, easy realization, huge recovered energy and high market share, therefore, its application has great significance and prospects.

Description of drawings

Fig. 1 is a system diagram of the present invention

1. Valve box; 2. Level 1 sea water pump; 3. Level 1 sea water pump; 4. Level 2 second sea water pump; 5. Level 2 third sea water pump; ; 8. Wastewater collection port; 9. Turbine; 10. Transmission shaft; 11. Wastewater outlet.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

A system for reusing waste water energy of a ship desulfurization device, the system mainly comprises: a valve box (1), a first-stage seawater pump (2), a second-stage first seawater pump (3), a second-stage second seawater pump (4), A secondary third seawater pump (5), a washing tower seawater inlet (6), a washing tower (7), a waste water collection port (8), a water turbine (9), a transmission shaft (10), and a waste water outlet (11).

Wherein, the water turbine (9) is installed in the waste water pipeline, close to the waste water outlet (11), and before the waste water outlet (11). The first-stage seawater pump (2) and the water turbine (9) are connected through a transmission shaft (10), and the two can rotate coaxially.

The valve box (1) and the waste water outlet (11) at the inlet of the washing seawater supply are located on both sides of the ship's side, which prevents the seawater from entering the washing tower (7) again after washing and weakens the washing effect of the seawater.

Two of the secondary first seawater pumps (3), the secondary second seawater pumps (4) and the secondary third seawater pumps (5) work when the system is running, and the other is used as a backup.

When the ship sails in the open sea, the open system of the ship starts to operate, the exhaust gas from the ship's diesel engine enters the scrubber (7) from the lower part through the pipeline, and the exhaust gas flows from bottom to top in the scrubber (7). At the same time, the seawater in the ocean passes through the valve box under the action of two of the second-stage first seawater pump (3), the second-stage second seawater pump (4) and the second-stage third seawater pump (5). (1) It is pumped to the washing tower (7) by the sea water, and enters the washing tower (7) at the seawater inlet (6) of the washing tower, and then the sea water is sprayed into a mist in the washing tower (7), and the sea water flows from the top to the bottom of the washing tower (7). The chemical reaction is carried out under the countercurrent flow of the exhaust gas.

The washed exhaust gas is discharged into the atmosphere, and the washed seawater turns into waste water and firstly passes through the waste water collection port (8) of the washing tower (7), and then the waste water flows along the waste water pipeline. A water turbine (9) is installed in the waste water pipeline at the lower part, and the waste water flowing from top to bottom will drive the rotation of the impeller of the water turbine (9), and then be discharged into the sea through the waste water outlet (11), and the impeller pushed by the waste water will be discharged into the sea. The primary seawater pump (2) connected with the transmission shaft (10) is driven to work. At this time, the first-stage seawater pump (2) can initially pressurize the seawater entering the pipeline from the valve box (1) to increase the pressure of the seawater, and then the second-stage seawater pump is used for secondary pressurization to pump the seawater into the washing tower. (7). Therefore, after the seawater is pressurized once by the washing wastewater, the operating power of the secondary seawater pump can be greatly reduced during the secondary pressurization.

The above descriptions are only the preferred embodiments of the present invention, and the specific embodiments described herein are only used to explain the present invention, and are not intended to limit the present invention. It should be pointed out: for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims (3)

1. a ship desulfurization device waste water energy reuse system, it is characterized in that: mainly comprise valve box (1), first-level sea water pump (2), second-level first seawater pump (3), second-level second seawater pump ( 4), secondary third sea water pump (5), washing tower sea water inlet (6), washing tower (7), waste water collection port (8), water turbine (9), transmission shaft (10), waste water outlet (11) ). Wherein, the water turbine (9) is installed in the waste water pipeline, close to the waste water outlet (11), and before the waste water outlet (11). 2. A kind of waste water energy reuse system of ship desulfurization device according to claim 1, characterized in that: the first-stage sea water pump (2) and the water turbine (9) are connected through a transmission shaft (10), and the two can achieve coaxial rotation. 3. The waste water energy reuse system of a ship desulfurization device according to claim 1, wherein the valve box (1) and the waste water outlet (11) at the inlet of the washing seawater supply are located on both sides of the ship's side .

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