SCV waste water waste heat recovery comprehensive cold-proof system

Abstract

The invention relates to the technical field of ship design and manufacturing, and discloses an SCV waste water waste heat recovery comprehensive cold-proof system which comprises a submerged combustion type vaporizer, a waste water filter and a ballast tank, the submerged combustion type vaporizer is connected with the waste water filter through a pipeline, and a heating coil is arranged in the ballast tank and connected with the waste water filter through a pipeline. The waste water filter is connected with a heating coil in the ballast tank through a heating pipeline, and the tail end of the heating coil is connected to an outer plate of the ballast tank through a broadside short pipe and communicated with the outside. The submerged combustion type vaporizer is applied to the floating storage revaporization device, the submerged combustion type vaporizer is used for vaporizing liquefied natural gas into waste water generated in the process of natural gas, the waste water discharge problem is firstly solved, meanwhile, waste heat of the waste water is also used for conducting auxiliary heating on the ballast tank under the extremely cold working condition, and the waste water is recycled. The steam consumption of the ballast tank of the ship under the cold working condition is reduced, and the feasibility of applying the submerged combustion vaporizer to a floating storage revaporization device is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of ship design and manufacturing, and in particular to a SCV wastewater waste heat recovery integrated cold protection system. Background Art

[0002] As greenhouse gas emission requirements become increasingly stringent, the demand for clean energy is also increasing, and the proportion of natural gas (NG) in energy consumption has also shown a trend of substantial growth. Floating storage and regasification units (FSRU) are becoming increasingly popular due to their advantages such as strong flexibility. The regasification system usually uses the heat of seawater or the heat of steam to heat liquefied natural gas (LNG). The method of using the heat of seawater for regasification is limited by the temperature of seawater, and its use is restricted in cold environments; similarly, the method of using the heat of steam for regasification is limited by the capacity of the boiler and the high cost. In cold and extremely cold conditions, it is also possible for FSRU to use a submerged combustion vaporizer (SCV) for vaporization.

[0003] The submerged combustion vaporizer (SCV) produces water during the combustion process, as shown in the following chemical reaction formula: CH4+AIR(0.21%O2+0.79%N2)=CO2+H2O+N2. Condensation process: high-temperature flue gas is sprayed into a 5-25℃ water bath, and the water vapor in the flue gas condenses into liquid and remains in the water bath, which will produce a large amount of wastewater. Therefore, using the submerged combustion vaporizer (SCV) as the regasification device of the FSRU requires solving and utilizing the large amount of wastewater generated during the vaporization process. Summary of the invention

[0004] The technical problem to be solved by the present invention is that when a submerged combustion vaporizer is used as a regasification device of a floating storage regasification device, a large amount of waste water is generated and cannot be treated.

[0005] In order to solve the above technical problems, the technical solution of the present invention is to provide an SCV wastewater waste heat recovery comprehensive cold protection system, including an submerged combustion vaporizer, a wastewater filter and a ballast tank, the submerged combustion vaporizer is connected to the wastewater filter through a pipeline, a heating coil is provided in the ballast tank, the wastewater filter is connected to the heating coil in the ballast tank through a heating pipe, and the end of the heating coil is connected to the outer plate of the ballast tank through a short side pipe and communicated with the outside world.

[0006] Optionally, a temperature sensor is provided in the ballast tank, a temperature control valve is provided on the heating pipe, and the temperature sensor is connected to the temperature control valve.

[0007] Optionally, the temperature control valve is also connected to a sea discharge pipeline.

[0008] Optionally, a check valve is provided on the heating pipe between the temperature control valve and the heating coil.

[0009] Optionally, a purge solenoid valve is provided at the connection between the heating coil and the heating pipe, and the purge solenoid valve is connected to an external air source.

[0010] Optionally, a submerged hydraulic side valve is provided between the heating coil and the side short pipe, a manual hydraulic pump group is provided outside the ballast tank, and the submerged hydraulic side valve is connected to the manual hydraulic pump group through a hydraulic pipe.

[0011] Optionally, the submerged hydraulic side valve is arranged at a position higher than the waterline of the ballast tank.

[0012] Optionally, a submerged check valve is provided between the submerged hydraulic port valve and the heating coil.

[0013] In summary, the SCV wastewater waste heat recovery comprehensive cold protection system of the present invention is used to apply the submerged combustion vaporizer to the floating storage regasification device, and utilize the submerged combustion vaporizer to vaporize the liquefied natural gas into the wastewater generated in the process of natural gas, firstly solve the wastewater discharge problem, and also utilize the waste heat of the wastewater to perform auxiliary heating on the ballast tank under extremely cold conditions, thereby reducing the steam consumption of the ballast tank of the ship under cold conditions, and solving the feasibility of using the submerged combustion vaporizer in the floating storage regasification device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the SCV wastewater waste heat recovery comprehensive cold protection system of the present invention;

[0015] In the figure: 1. Submerged combustion vaporizer; 2. Wastewater filter; 3. Temperature control valve; 4. Temperature sensor; 5. Check valve; 6. Purge valve solenoid valve; 7. Heating coil; 8. Submerged check valve; 9. Submerged hydraulic side valve; 10. Side short pipe; 11. Hydraulic pipe; 12. Manual hydraulic pump group; 13. Ballast tank. DETAILED DESCRIPTION

[0016] The following combination Figure 1 The present invention is described in further detail.

[0017] The present invention discloses a SCV wastewater waste heat recovery comprehensive cold protection system, referring to Figure 1 , including an immersed combustion vaporizer 1, a wastewater filter 2 and a ballast tank 13. The immersed combustion vaporizer 1 is connected to the wastewater filter 2 through a pipeline. A heating coil 7 is provided in the ballast tank 13. The wastewater filter 2 is connected to the heating coil 7 in the ballast tank 13 through a heating pipeline. The end of the heating coil 7 is connected to the outer plate of the ballast tank 13 through a short side pipe 10 and is connected to the outside. The wall thickness of the short side pipe 10 needs to meet the requirements of the classification society specifications.

[0018] In a further embodiment, a temperature sensor 4 is provided in the ballast tank 13, a temperature control valve 3 is provided on the heating pipe, the temperature sensor 4 is connected to the temperature control valve 3, a check valve 5 is provided on the heating pipe between the temperature control valve 3 and the heating coil 7, and a sea discharge pipeline is also connected to the temperature control valve 3. The temperature control valve 3 is controlled by the temperature sensor 4. When the temperature of the ballast tank 13 does not reach the set temperature, the temperature control valve 3 controls the wastewater to enter the ballast tank 13. Otherwise, the temperature control valve 3 controls the wastewater to be discharged directly into the sea through the sea discharge pipeline.

[0019] In a further embodiment, a purge solenoid valve 6 is provided at the connection between the heating coil 7 and the heating pipe, and the purge solenoid valve 6 is connected to an external air source. When the SCV stops working, its control signal controls the purge solenoid valve 6 to open, and compressed air is used to purge the heating coil 7 to prevent the heating coil from being frozen under extreme working conditions. After purging for a period of time, the purge solenoid valve 6 can be closed.

[0020] In a further embodiment, a submerged hydraulic side valve 9 is provided between the heating coil 7 and the side short pipe 10 for controlling the discharge of waste water. A manual hydraulic pump group 12 is provided outside the ballast tank 13. The manual hydraulic pump group 12 can be arranged on the deck to control the opening and closing state of the submerged hydraulic side valve 9. The submerged hydraulic side valve 9 is connected to the manual hydraulic pump group 12 through a hydraulic pipe 11. The submerged hydraulic side valve 9 is arranged at a position higher than the water line of the ballast tank 13. A submerged check valve 8 is provided between the submerged hydraulic side valve 9 and the heating coil 7 to prevent seawater from backflowing into the heating coil.

[0021] 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 preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A SCV wastewater waste heat recovery comprehensive cold protection system, characterized in that: The invention comprises an immersed combustion vaporizer (1), a wastewater filter (2) and a ballast tank (13), wherein the immersed combustion vaporizer (1) is connected to the wastewater filter (2) via a pipeline, a heating coil (7) is arranged in the ballast tank (13), the wastewater filter (2) is connected to the heating coil (7) in the ballast tank (13) via a heating pipeline, and the end of the heating coil (7) is connected to the outer plate of the ballast tank (13) via a short side pipe (10) and communicates with the outside.

2. The SCV wastewater waste heat recovery comprehensive cold protection system according to claim 1 is characterized in that: A temperature sensor (4) is provided in the ballast tank (13), a temperature control valve (3) is provided on the heating pipe, and the temperature sensor (4) is connected to the temperature control valve (3).

3. The SCV wastewater waste heat recovery comprehensive cold protection system according to claim 2 is characterized in that: The temperature control valve (3) is also connected to a sea discharge pipeline.

4. The SCV wastewater waste heat recovery comprehensive cold protection system according to claim 2 is characterized in that: A check valve (5) is provided on the heating pipeline between the temperature control valve (3) and the heating coil (7).

5. The SCV wastewater waste heat recovery comprehensive cold protection system according to claim 1 is characterized in that: A purge solenoid valve (6) is provided at the connection between the heating coil (7) and the heating pipeline, and the purge solenoid valve (6) is connected to an external air source.

6. The SCV wastewater waste heat recovery comprehensive cold protection system according to claim 1 is characterized in that: A submerged hydraulic side valve (9) is provided between the heating coil (7) and the side short pipe (10), a manual hydraulic pump group (12) is provided outside the ballast tank (13), and the submerged hydraulic side valve (9) is connected to the manual hydraulic pump group (12) through a hydraulic pipe (11).

7. The SCV wastewater waste heat recovery comprehensive cold protection system according to claim 6 is characterized in that: The submerged hydraulic side valve (9) is arranged at a position higher than the water line of the ballast tank (13).

8. The SCV wastewater waste heat recovery comprehensive cold protection system according to claim 6 is characterized in that: A submerged check valve (8) is provided between the submerged hydraulic port valve (9) and the heating coil (7).

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