Special nitrogen system for green intelligent ship

Abstract

The utility model discloses a special nitrogen system for a green intelligent ship. The special nitrogen system comprises a nitrogen generation part and a nitrogen application part, the nitrogen generation part comprises two adsorption towers; an air inlet pipe is arranged on the adsorption tower, and the lower end of the air inlet pipe is positioned at the inner bottom of the adsorption tower; four short connecting pipes and four T-shaped pipes are arranged at the lower end of the air inlet pipe; the T-shaped pipe is positioned above the short connecting pipe; the tail ends of the short connecting pipes are located between the two adjacent T-shaped pipes. The tail end of the short connecting pipe and the two tail ends of the T-shaped pipe are each provided with an ore screen pipe. And the air inlets are uniformly distributed in the cross section of the adsorption tower. Through a set of PSA nitrogen generator, the requirements of all systems of the green intelligent ship for nitrogen are met, and the requirements of classification societies for safety can also be met; the PSA nitrogen generator is provided with the gas distribution structure, so that gas passing through the ore sieve pipe can be quickly dispersed, and gas can pass through each part of a molecular sieve in the adsorption tower.

Description

Technical Field

[0001] The utility model belongs to the technical field of nitrogen manufacturing, and in particular relates to a nitrogen system dedicated to green intelligent ships. Background Art

[0002] In recent years, methanol has emerged as a new force in the shipping industry as a fuel and has become one of the green, environmentally friendly, low-carbon fuels for ocean-going ships. Methanol is a volatile fuel with a low flash point, low boiling point, and its safe storage and transportation are particularly important. Inert gas is needed to isolate the methanol fuel from oxygen to reduce the risk of methanol flammability. The conventional inert protective gases in the shipping industry are mainly carbon dioxide and nitrogen. Carbon dioxide is produced by burning fuel in a combustion chamber through an inert gas generator. Due to combustion, carbon dioxide is mixed with more particles and is relatively dirty, which is not suitable for clean fuels such as methanol. In addition, the inert gas produced by the inert gas generator is at normal pressure, and the low pressure cannot meet the pressure requirements of various operating conditions of methanol fuel.

[0003] A Chinese patent document with publication number CN105197898B discloses a marine nitrogen manufacturing system, which is composed of the following equipment connected in sequence through pipelines: a compressor, including at least one compression unit, for providing compressed air; a nitrogen generator, including at least two nitrogen generator units, for preparing nitrogen; and / or a nitrogen buffer tank, for storing and buffering nitrogen; and a flow and pressure regulating device, for regulating flow and pressure.

[0004] The above patent scheme uses a nitrogen production device using a pressure swing adsorption (PSA) nitrogen generator as a nitrogen generator to produce nitrogen. The nitrogen production speed and desorption speed of the PSA nitrogen generator are key factors affecting performance. A slow nitrogen production speed will affect the delay of subsequent nitrogen application. Insufficient desorption will result in insufficient regeneration, which will lead to an increase in oxygen content and a significant reduction in nitrogen production efficiency. Utility Model Content

[0005] In order to overcome the technical problems of slow nitrogen production speed and insufficient desorption in the adsorption tower of the PSA nitrogen generator in the prior art; one purpose of the utility model is to provide a nitrogen system dedicated to green smart ships, by arranging a gas distribution structure in the adsorption tower, increasing the number of gas passages in the adsorption tower, and making each gas passage evenly dispersed to face the cross section in the adsorption tower, thereby increasing the cross-sectional area of ​​the gas inlet and outlet and accelerating the conversion speed.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a green smart ship special nitrogen system, including a nitrogen production part and a nitrogen application part; the nitrogen production part includes a plurality of groups of PSA nitrogen generators, each group of the PSA nitrogen generators includes two adsorption towers; an air inlet pipe is arranged on the adsorption tower, and the lower end of the air inlet pipe is located at the bottom center of the adsorption tower; four short pipes and four T-tubes evenly distributed along the circumferential direction are arranged at the lower end of the air inlet pipe; the T-tube is located above the short pipe; the end of the short pipe is located between two adjacent T-tubes; the end of the short pipe and the two ends of the T-tube are respectively provided with ore sieve pipes; each of the ore sieve pipes is connected to the air inlet pipe and is evenly distributed in the cross section of the adsorption tower.

[0007] Preferably, the two ports of the T-tube located on the same straight line are provided with the ore sieve pipes, and the other port is provided at the lower end of the air inlet pipe; the ore sieve pipes located on the T-tube form a square structure, and the remaining ore sieve pipes are located inside the square structure.

[0008] The ore sieve tubes are evenly distributed in the adsorption tower, and the gas passing through the ore sieve tubes can be quickly dispersed, so that gas can pass through each part of the molecular sieve inside the adsorption tower, which helps to increase the separation speed and desorption speed of nitrogen and oxygen. At the same time, due to the appearance characteristics of the adsorption tower, its lower end is a circular arc convex top, and the ore sieve tubes on the short pipe are located at the bottom, making the adsorption tower compact, reducing the overall volume, and facilitating installation.

[0009] Preferably, an output pipe is provided on the adsorption tower, and the upper end of the output pipe is located at the top center position of the adsorption tower; the upper end of the output pipe is provided with eight ore screen pipes evenly distributed along the circumferential direction.

[0010] Specifically, the outer wall of the ore sieve pipe is provided with a plurality of ventilation holes connected with the air inlet pipe; a molecular sieve for separating nitrogen and oxygen is provided in the adsorption tower; and the diameter of the ventilation holes is smaller than the diameter of the molecular sieve.

[0011] The ore sieve tube is formed by winding flat irons, and a small gap, namely the ventilation hole, is left between every two flat irons. The diameter of the ventilation hole is smaller than the diameter of the molecular sieve to prevent the molecular sieve from leaking out of the ventilation hole and causing powder spraying. The ore sieve tube also plays a filtering role.

[0012] Specifically, a pressure gauge tube connected to the interior of the adsorption tower is provided in the middle of the outer wall of the adsorption tower; a pressure gauge is provided on the pressure gauge tube; a sewage pipe is provided at the bottom of the adsorption tower; and a sewage valve is provided on the sewage pipe.

[0013] Furthermore, the purity of the nitrogen produced by the nitrogen production part can be adjusted within the range of 95%-99%.

[0014] Furthermore, the gas of the nitrogen production part flows to the air compressor, the air buffer tank, the air treatment equipment, and the PSA nitrogen generator in sequence; the air treatment equipment includes three groups of filters, which filter the moisture and dust in the compressed air step by step, and the final air filtration level reaches: 0.01μm, 0.003mg / m.

[0015] Furthermore, the nitrogen application part includes six branches; among them, the output pressure value of branch I is 10 bar, which is used for purging the methanol main engine; the output pressure value of branch II is 10 bar, which is used to supply the ship's fuel supply system; the output pressure value of branch III is 0.17 bar, which is used for the methanol tank; the output pressure value of branch IV is 0.17 bar, which is used to replenish the cargo oil tank; the output pressure value of branch V is 7 bar, which is used to purge the pipelines on the ship; the output pressure value of branch VI is 0.17 bar, which is used for inerting the cargo oil tank.

[0016] Specifically, the gas flow direction of the branch I is the nitrogen production part, the first nitrogen storage tank, the booster, the third nitrogen storage tank, and the first pressure reducing valve in sequence; the gas flow direction of the branch II is the nitrogen production part, the first nitrogen storage tank, the booster, the fourth nitrogen storage tank, and the second pressure reducing valve in sequence; the gas flow direction of the branch III is the nitrogen production part, the second nitrogen storage tank, the first DBB protection system, and the third pressure reducing valve in sequence; the gas flow direction of the branch IV is the nitrogen production part, the second nitrogen storage tank, the second DBB protection system, and the fourth pressure reducing valve in sequence; the gas flow direction of the branch V is the nitrogen production part, the second nitrogen storage tank, the second DBB protection system, and the fifth pressure reducing valve in sequence; the gas flow direction of the branch VI is the nitrogen production part and the third DBB protection system in sequence.

[0017] Specifically, the booster increases the gas pressure to 30 bar.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. A set of PSA nitrogen generators can meet the nitrogen needs of all systems of green smart ships. They are independent of each other, and the use of each branch is not affected by other branches. It can also meet the safety requirements of various classification societies;

[0020] 2. The PSA nitrogen generator increases the gas distribution structure, so that the gas passing through the sieve tube can be quickly dispersed, so that gas can pass through all parts of the molecular sieve inside the adsorption tower, which helps to increase the separation speed and desorption speed of nitrogen and oxygen, that is, improve the working efficiency of nitrogen output;

[0021] 3. For nitrogen application, by sharing nitrogen storage tanks, the solution layout is compact and easy to install and arrange on green smart ships with relatively limited space. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the adsorption tower of the utility model;

[0023] Figure 2 It is a schematic diagram of the arrangement of the lower mine screen pipe of the utility model;

[0024] Figure 3 This is a flow chart of the nitrogen production part of the utility model;

[0025] Figure 4 This is a flow chart of the nitrogen application part of the utility model;

[0026] Figure 5 This is the actual layout diagram of the nitrogen production and nitrogen application parts of the utility model.

[0027] In the figure: 1. adsorption tower; 2. air inlet pipe; 21. short connecting pipe; 22. long connecting pipe; 23. T-type pipe; 24. ore screen pipe; 3. output pipe; 4. pressure gauge pipe; 5. sewage pipe. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0029] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific protection scope of the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise specified and limited, the terms "setting", "installation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection; it can be directly connected, or it can be connected through an intermediate medium, or two elements can be internally connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] See also Figure 1-Figure 2 A nitrogen system for green smart ships includes a nitrogen production part and a nitrogen application part; the nitrogen production part includes a plurality of PSA nitrogen generators, each of which includes two adsorption towers 1; an air inlet pipe 2 is provided on the adsorption tower 1, the lower end of the air inlet pipe 2 is located at the central position of the bottom of the adsorption tower 1, and the upper end of the air inlet pipe 2 extends outward from the middle of the adsorption tower 1; four short pipes 21 and four long pipes 22 are evenly distributed in the circumferential direction at the lower end of the air inlet pipe 2; the short pipe 21 is located between two adjacent long pipes 22; the long pipe 22 is located above the short pipe 21.

[0033] A T-tube 23 is provided at the end of each long connecting pipe 22; a mineral sieve tube 24 is provided at the end of the short connecting pipe 21 and the two ends of the T-tube 23; each mineral sieve tube 24 is connected to the air inlet pipe 2 and is evenly distributed in the cross-section of the adsorption tower 1; the mineral sieve tube 24 is provided at two ports of the T-tube 23 located on the same straight line, and the other port is provided at the end of the long connecting pipe 22; the mineral sieve tubes 24 located on the T-tube 23 form a square structure, and the remaining mineral sieve tubes 24 are located inside the square structure.

[0034] A pressure gauge pipe 4 communicating with the interior of the adsorption tower 1 is provided in the middle of the outer wall of the adsorption tower 1 ; a pressure gauge is provided on the pressure gauge pipe 4 ; a sewage pipe 5 is provided at the bottom of the adsorption tower 1 ; a sewage valve is provided on the sewage pipe 5 .

[0035] The adsorption tower 1 is provided with an output pipe 3, the upper end of which is located at the top center of the adsorption tower 1; the upper end of the output pipe 3 is provided with eight ore screen pipes 24 evenly distributed along the circumferential direction.

[0036] See also Figure 3-4The nitrogen production part: adopts PSA nitrogen generator to produce qualified nitrogen with maximum displacement, and the purity is adjustable from 95% to 99%; the nitrogen application branch: 6 branches are set behind the PSA nitrogen generator, and each branch is respectively provided with a nitrogen storage tank, a booster, a pressure reducing valve and a DBB protection system, which can simultaneously meet the requirements of various parts such as the methanol main engine, the methanol tank, and the cargo hold for different nitrogen pressures and flows.

[0037] The nitrogen production part mainly includes four system components, which are: air compressor - air buffer tank - air treatment equipment - PSA nitrogen generator according to its working process. Its main functions are described as follows:

[0038] Air compressor: provides compressed air with stable pressure and flow for the nitrogen making system;

[0039] Air buffer tank: to buffer the compressed air and stabilize the inlet pressure of the PSA nitrogen generator;

[0040] Air treatment equipment: It contains three groups of filters, which filter the moisture and dust in the compressed air step by step. The final air filtration level can reach: 0.01μm, 0.003mg / m;

[0041] PSA nitrogen generator: It is the main place for producing nitrogen and adopts PSA pressure swing adsorption nitrogen generator; the PSA nitrogen generator includes two adsorption towers.

[0042] The nitrogen application part is arranged behind the PSA nitrogen generator and is divided into 6 branches. The basic configuration and function of each branch are as follows:

[0043] Branch I: This branch is equipped with a booster to increase the nitrogen pressure to 30 bar and store it in the first nitrogen storage tank. A pressure reducing valve group is set at the rear to reduce the nitrogen pressure to 10 bar for purging of the methanol main engine. Its main components include: first nitrogen storage tank - booster - third nitrogen storage tank - first pressure reducing valve.

[0044] Branch II: This branch is set behind the booster of branch I and is equipped with a nitrogen storage tank to store 30 bar high-pressure nitrogen. A pressure reducing valve group is set at the rear to reduce the nitrogen pressure to 10 bar. It is used in the ship fuel supply system. Its main components include: the first nitrogen storage tank - booster - the fourth nitrogen storage tank - the second pressure reducing valve according to the process flow.

[0045] Branch III: This branch is set behind the PSA nitrogen generator and is equipped with a nitrogen storage tank, a DBB protection system and a pressure reducing valve group to make the exhaust pressure reach 0.17 bar. It is used for methanol tanks. Its main components include: the second nitrogen storage tank-the first DBB protection system-the third pressure reducing valve according to the process flow.

[0046] Branch IV: This branch is set behind the second nitrogen storage tank and is equipped with a DBB protection system and a pressure reducing valve group to make the exhaust pressure reach 0.17 bar. It is used for replenishing gas in the cargo oil tank. Its main components include: second nitrogen storage tank-second DBB protection system-fourth pressure reducing valve according to the process flow.

[0047] Branch V: This branch is set behind the second DBB protection system and is equipped with a pressure reducing valve group to stabilize the exhaust pressure at 7 bar. It is used to purge the pipelines on the ship with nitrogen. Because there are fuel or chemicals in the pipelines, it would be dangerous to purge them directly with air, so nitrogen is used for purge. Its main components include: second nitrogen storage tank-second DBB protection system-fifth pressure reducing valve according to the process flow.

[0048] Branch VI: This branch is set behind the PSA nitrogen generator. Through the DBB protection system, it directly produces a large displacement of 0.17 bar nitrogen for cargo oil tank inerting. Its main components include: PSA nitrogen generator-the third DBB protection system.

[0049] The above technical solution is a nitrogen supply system specially developed for green smart ships. Green smart ships use methanol, a green and clean energy, as fuel. The frequency, amount, pressure, etc. of nitrogen usage in its methanol main engine, methanol tank, cargo hold and other parts are all different. This requires that the output and pressure of the nitrogen generator can meet the maximum nitrogen usage requirements of each part, and at the same time, the pressure can be freely adjusted on each branch according to different working conditions.

[0050] The above description is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are included in the patent scope of the present invention.

Claims

1. A nitrogen system for green smart ships, characterized by: It includes a nitrogen production part and a nitrogen application part; the nitrogen production part includes multiple groups of PSA nitrogen generators, and each group of PSA nitrogen generators includes two adsorption towers; an air inlet pipe is arranged on the adsorption tower, and the lower end of the air inlet pipe is located at the central position of the bottom of the adsorption tower; four short pipes and four T-tubes evenly distributed along the circumferential direction are arranged at the lower end of the air inlet pipe; the T-tube is located above the short pipe; the end of the short pipe is located between two adjacent T-tubes; the end of the short pipe and the two ends of the T-tube are respectively provided with ore sieve pipes; each of the ore sieve pipes is connected to the air inlet pipe and is evenly distributed in the cross section of the adsorption tower.

2. The nitrogen system according to claim 1, characterized in that: The two ports of the T-tube located on the same straight line are provided with the ore sieve pipes, and the other port is provided at the lower end of the air inlet pipe; the ore sieve pipes located on the T-tube form a square structure, and the remaining ore sieve pipes are located inside the square structure.

3. The nitrogen system according to claim 1 or 2, characterized in that: The adsorption tower is provided with an output pipe, the upper end of which is located at the top center of the adsorption tower; the upper end of the output pipe is provided with eight ore screen pipes evenly distributed along the circumferential direction.

4. The nitrogen system according to claim 1 or 2, characterized in that: The outer wall of the ore sieve pipe is provided with a plurality of ventilation holes connected with the air inlet pipe; a molecular sieve for separating nitrogen and oxygen is provided in the adsorption tower; and the diameter of the ventilation holes is smaller than the diameter of the molecular sieve.

5. The nitrogen system according to claim 1 or 2, characterized in that: A pressure gauge tube communicating with the interior of the adsorption tower is arranged in the middle of the outer wall of the adsorption tower; a pressure gauge is arranged on the pressure gauge tube; a sewage pipe is arranged at the bottom of the adsorption tower; a sewage valve is arranged on the sewage pipe.

6. The nitrogen system according to claim 1 or 2, characterized in that: The purity of the nitrogen produced by the nitrogen production part can be adjusted within the range of 95%-99%.

7. The nitrogen system according to claim 1 or 2, characterized in that: The gas flow of the nitrogen production part is to the air compressor, air buffer tank, air treatment equipment, and the PSA nitrogen generator in sequence; the air treatment equipment includes three groups of filters, which filter the moisture and dust in the compressed air step by step, and the final air filtration level reaches: 0.01μm, 0.003mg / m.

8. The nitrogen system according to claim 1 or 2, characterized in that: The nitrogen application part includes six branches; among them, the output pressure value of branch I is 10 bar, which is used for purging the methanol main engine; the output pressure value of branch II is 10 bar, which is used to supply the ship's fuel supply system; the output pressure value of branch III is 0.17 bar, which is used for the methanol tank; the output pressure value of branch IV is 0.17 bar, which is used for replenishing air in the cargo oil tank; the output pressure value of branch V is 7 bar, which is used for purging the pipelines on the ship; the output pressure value of branch VI is 0.17 bar, which is used for inerting the cargo oil tank.

9. The nitrogen system according to claim 8, characterized in that: The gas flow direction of the branch I is the nitrogen production part, the first nitrogen storage tank, the booster, the third nitrogen storage tank, and the first pressure reducing valve in sequence; The gas flow direction of the branch II is the nitrogen production part, the first nitrogen storage tank, the booster, the fourth nitrogen storage tank, and the second pressure reducing valve in sequence; The gas flow direction of the branch III is the nitrogen production part, the second nitrogen storage tank, the first DBB protection system, and the third pressure reducing valve in sequence; The gas flow direction of the branch IV is the nitrogen production part, the second nitrogen storage tank, the second DBB protection system, and the fourth pressure reducing valve in sequence; The gas flow direction of the branch V is the nitrogen production part, the second nitrogen storage tank, the second DBB protection system, and the fifth pressure reducing valve in sequence; The gas flow direction of the branch VI is the nitrogen production part and the third DBB protection system in sequence.

10. The nitrogen system according to claim 9, characterized in that: The booster increases the gas pressure to 30 bar.

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