Methanol water glycol heat exchange system for methanol fuel ultra-large oil tanker

Abstract

A methanol-water glycol heat exchange system for a methanol fuel ultra-large oil tanker is characterized in that a methanol-water glycol heat exchanger is sequentially connected with a cooling water-water glycol heat exchanger and a water glycol circulating pump through pipelines and then returns to the methanol-water glycol heat exchanger; cabin cooling water enters the cooling water-water glycol heat exchanger through the cooling water inlet and then returns to the cabin through the cooling water outlet, and the cooling water-water glycol heat exchanger and the cabin cooling water outlet are located on the same layer of platform in the cabin. The methanol-water glycol heat exchanger and a pipeline connected with the methanol-water glycol heat exchanger are arranged on a deck, and other devices are all located in a cabin. According to the methanol supply unit skid, a cabin cooling water booster pump does not need to be arranged, the cost is reduced, the medium conveyed to the main deck is water glycol instead of cabin cooling water, the operation stability is improved, and the size of the methanol supply unit skid is greatly reduced.

Description

Technical Field

[0001] The invention belongs to the field of methanol fuel ship construction and design, and in particular relates to a methanol-water-ethylene glycol heat exchange system for a methanol fuel super-large oil tanker. Background Art

[0002] With the restriction of carbon emissions, the global production of green methanol is on the rise. As a marine fuel, methanol can reduce sulfur oxides (SOx) by about 99%, nitrogen oxides by 80%, and carbon dioxide emissions by up to 25%. Green methanol has wide development feasibility as a marine fuel in the world. 122 of the world's top 100 ports can add methanol fuel. According to the forecast of relevant institutions, from 2025 to 2050, methanol will compete with low-sulfur fuel in terms of price, and it will play a "considerable role" in the global marine fuel portfolio. Drewry expects that half of the ships ordered after 2025 will use dual-fuel engines, and a large part of them will choose methanol.

[0003] Methanol, as a low-flashpoint fuel, needs to be heat exchanged through an intermediate medium, water-ethylene glycol solution, which in turn undergoes secondary heat exchange through the cabin cooling water. The methanol-water-ethylene glycol heat exchange system needs to consider the overall layout, and the system design needs to meet the requirements of both the methanol supply system and the cabin cooling water. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a methanol-water-ethylene glycol heat exchange system for a methanol-fueled ultra-large oil tanker, and the technical solution adopted is:

[0005] A methanol-water-glycol heat exchange system for a methanol-fueled ultra-large oil tanker comprises a methanol-water-glycol heat exchanger, a water-glycol expansion water tank, and a cooling water-water-glycol heat exchanger; the water-glycol expansion water tank replenishes water-glycol solution into the system through a stop valve, and the height of the water-glycol expansion water tank is higher than all users in the system.

[0006] The methanol-water glycol heat exchanger is connected to the cooling water-water glycol heat exchanger and the water glycol circulation pump in sequence through pipelines, and then returns to the methanol-water glycol heat exchanger to form a heat exchange cycle. The engine room cooling water enters the cooling water-water glycol heat exchanger through the cooling water inlet, and then returns to the engine room through the cooling water outlet. The cooling water-water glycol heat exchanger and the engine room cooling water outlet are on the same platform in the engine room.

[0007] The passage from the cooling water-water glycol heat exchanger to the methanol-water glycol heat exchanger is provided with a first stop valve, a stop check valve, a water glycol pump, a filter, and a second stop valve in sequence. The water glycol expansion water tank is connected to a vent pipe and a water glycol filling pipe.

[0008] The cooling water-water glycol heat exchanger, the water glycol expansion water tank, the water glycol circulation pump and the filter are arranged in the engine room, and the methanol-water glycol heat exchanger and the pipelines connected to the methanol-water glycol heat exchanger are arranged on the deck.

[0009] The above-mentioned methanol-water-glycol heat exchange system for a methanol-fueled VLCC, further, has a pipeline on the deck connected to the methanol-water-glycol heat exchanger coated with insulating material.

[0010] The above-mentioned methanol-water-glycol heat exchange system for a methanol-fueled VLCC, further, the methanol-water-glycol heat exchanger has a methanol inlet and a methanol outlet, which are connected to a methanol storage tank.

[0011] The methanol-water-glycol heat exchange system for a methanol-fueled VLCC further comprises a ventilation valve disposed on the ventilation pipeline and a filling valve disposed on the water-glycol filling pipeline.

[0012] The above-mentioned methanol-water-glycol heat exchange system for a methanol-fueled ultra-large oil tanker, further, has two sets of first stop valves, stop check valves, water glycol pumps, filters and second stop valves arranged on the passage from the cooling water-water glycol heat exchanger to the water glycol circulation pump, and the two sets of first stop valves, stop check valves, water glycol circulation pumps, filters and second stop valves are connected in parallel.

[0013] The above-mentioned methanol-water-ethylene glycol heat exchange system for methanol-fueled very large oil tankers, further, is provided with stop valves on the pipelines connecting the cooling water-water-ethylene glycol heat exchanger and the cooling water inlet and the cooling water outlet.

[0014] The heat exchanger for engine room cooling water and water glycol solution, water glycol circulation pump, water glycol expansion tank and other equipment of the present invention are arranged in the engine room, and the cooling water-water glycol heat exchanger and the engine room cooling water outlet are on the same platform in the engine room, which can ensure the pressure requirement of the heat exchanger inlet, and it is not necessary to set a booster pump at the engine room cooling water outlet. Such arrangement and design can ensure that the medium transported to the main deck is water glycol, because the water glycol solution is not easy to freeze, which can ensure smooth circulation of the pipeline on the main deck, and when the ship travels to a cold area, it is not necessary to specially consider the insulation material for the pipeline on the main deck.

[0015] The present invention does not need to set up a cabin cooling water booster pump, which reduces costs, and the medium transported to the main deck is water glycol instead of cabin cooling water, which improves the stability of operation. Only one methanol water glycol heat exchanger is retained and arranged in the methanol supply unit skid located on the main deck, and the rest of the equipment is all arranged in the cabin, which can greatly reduce the size of the methanol supply unit skid. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a system schematic diagram of the present invention;

[0017] Among them, 1-stop valve, 2-cooling water-water glycol heat exchanger, 3-stop valve, 4-first stop valve, 5-stop check valve, 6-water glycol circulation pump, 7-filter, 8-second stop valve, 9-vent valve, 10-filling valve, 11-stop valve, 12-stop valve, 13-methanol-water glycol heat exchanger, 14-stop valve, 15-stop valve, 16-water glycol expansion water tank. DETAILED DESCRIPTION

[0018] The present invention will be further described in conjunction with the accompanying drawings.

[0019] like Figure 1 As shown, a methanol-water-glycol heat exchange system for a methanol-fueled super-large oil tanker, the cooling water from the engine room enters the cooling water-water-glycol heat exchanger 2 through the stop valve 3, and the heat exchange between the engine room cooling water and the water-glycol solution is completed in the cooling water-water-glycol heat exchanger 2. After the heat exchange, the engine room cooling water returns to the engine room cooling water system through the stop valve 1, and the water-glycol solution after the heat exchange enters the water-glycol pump 6 through the first stop valve 4, the stop check valve 5, the filter 7 and the second stop valve 8, and then through the stop valve 12, the water-glycol solution is transported from the engine room to the methanol-water-glycol heat exchanger 13 located on the main deck, and the heat exchange between methanol and water-glycol is completed in the methanol-water-glycol heat exchanger 13. The water-glycol solution after the heat exchange returns to the cooling water-water-glycol heat exchanger 2 through the stop valves 14 and 15, completing the circulation of the entire system. A water glycol expansion water tank 16 is arranged at the highest point of the entire circulation system, the water glycol expansion water tank is connected with a vent pipe and a water glycol filling pipe, a vent valve 9 is arranged on the vent pipe, a filling valve 10 is arranged on the water glycol filling pipe, the water glycol expansion water tank replenishes the water glycol solution into the system through a stop valve 11, and the height of the water glycol expansion water tank is higher than all users in the system.

Claims

1. A methanol-water-ethylene glycol heat exchange system for a methanol-fueled supertanker, characterized in that: The system comprises a methanol-water glycol heat exchanger (13), a water glycol expansion water tank (16), and a cooling water-water glycol heat exchanger (2); the water glycol expansion water tank replenishes water glycol solution into the system through a stop valve (11), and the height of the water glycol expansion water tank is higher than all users in the system; The methanol-water glycol heat exchanger is connected to the cooling water-water glycol heat exchanger and the water glycol circulation pump in sequence through pipelines, and then returns to the methanol-water glycol heat exchanger to form a heat exchange cycle; the engine room cooling water enters the cooling water-water glycol heat exchanger through the cooling water inlet, and then returns to the engine room through the cooling water outlet. The cooling water-water glycol heat exchanger and the engine room cooling water outlet are on the same platform in the engine room; A first stop valve (4), a stop check valve (5), a water glycol circulation pump (6), a filter (7), and a second stop valve (8) are sequentially arranged on the passage from the cooling water-water glycol heat exchanger to the methanol-water glycol heat exchanger, and a venting pipeline and a water glycol filling pipeline are connected to the water glycol expansion water tank; The cooling water-water glycol heat exchanger, the water glycol expansion water tank, the water glycol circulation pump and the filter are arranged in the engine room, and the methanol-water glycol heat exchanger and the pipelines connected to the methanol-water glycol heat exchanger are arranged on the deck.

2. A methanol-water-ethylene glycol heat exchange system for a methanol-fueled VLCC according to claim 1, characterized in that: The pipes on the deck connected to the methanol-water glycol heat exchanger are covered with insulating material.

3. The methanol-water-ethylene glycol heat exchange system for a methanol-fueled VLCC according to claim 1, characterized in that: The methanol-water glycol heat exchanger has a methanol inlet and a methanol outlet and is connected to a methanol storage tank.

4. The methanol-water-ethylene glycol heat exchange system for a methanol-fueled VLCC according to claim 1, characterized in that: A ventilation valve (9) is arranged on the ventilation pipeline, and a filling valve (10) is arranged on the water glycol filling pipeline.

5. The methanol-water-ethylene glycol heat exchange system for a methanol-fueled VLCC according to claim 1, characterized in that: Two sets of stop check valves, a water glycol pump, a filter and a second stop valve are arranged on the passage from the cooling water-water glycol heat exchanger to the methanol-water glycol heat exchanger, and the two sets of stop check valves, a water glycol circulation pump, a filter and a second stop valve are connected in parallel.

6. The methanol-water-ethylene glycol heat exchange system for a methanol-fueled VLCC according to claim 1, characterized in that: Stop valves are provided on the pipelines connecting the cooling water-water glycol heat exchanger with the cooling water inlet and the cooling water outlet.

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