Marine SCR equalizing valve device

Abstract

The application discloses a marine SCR pressure equalizing valve device, which comprises a two-position five-way valve body, a first port of the two-position five-way valve body is communicated with a control air system capable of controlling air to enter the inside, a second port of the two-position five-way valve body is communicated with a pilot valve of an SCR outlet valve, a third port of the two-position five-way valve body is communicated with the outside atmosphere, a fourth port of the two-position five-way valve body is communicated with an SCR side pipeline, and a fifth port of the two-position five-way valve body is communicated with a main engine side pipeline. The whole device is reasonable in design, simple in structure and convenient to operate, can effectively avoid the surge phenomenon of the main engine supercharger, improves the service life of the supercharger, reduces the probability of safety accidents of the ship, and brings great convenience to the pressure regulation work of the SCR side pipeline and the main engine side pipeline.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pressure equalizing valve for ships, in particular to a marine SCR pressure equalizing valve device. BACKGROUND

[0002] The Tier III emission standard of the International Maritime Organization has been implemented worldwide, and its specific requirement is that the nitrogen oxide (NOx) emission value of a ship must be limited to below 3.4 g / kwh.

[0003] In order to meet the requirements of the regulations, the main engine of the newly built ship currently adopts selective catalytic reduction technology (SCR) as a solution. In the parked state, the SCR side pipeline needs to ensure that the pressure is slightly greater than that of the main engine side pipeline, so as to realize the function of SCR airtightness. Therefore, how to balance the pressure difference between the SCR side pipeline and the main engine side pipeline has become the key to its stable operation.

[0004] When the SCR is in the parked state, the load of the main engine side pipeline often suddenly increases or decreases with various conditions, and in this process, the pressure difference between the main engine side pipeline and the SCR side pipeline will change dramatically. A larger pressure difference will cause the SCR control system to open the relief port, and the pressure of the main engine side pipeline will be discharged from the relief port. In the process of relieving pressure, the load of the main engine supercharger will suddenly change, thereby causing the surge phenomenon. Not only does this reduce the service life of the supercharger, but it also increases the probability of a safety accident of the ship, and brings great inconvenience to the pressure regulation work of the SCR side pipeline and the main engine side pipeline. SUMMARY

[0005] In order to solve the problems existing in the prior art, the purpose of the present application is to provide a marine SCR pressure equalizing valve device. The pressure equalizing valve device has reasonable overall design, simple structure and convenient operation, can effectively avoid the surge phenomenon of the main engine supercharger, not only improves the service life of the supercharger, but also reduces the probability of a safety accident of the ship, and brings great convenience to the pressure regulation work of the SCR side pipeline and the main engine side pipeline.

[0006] In order to solve the above technical problems, the present application adopts the following technical solutions:

[0007] A marine SCR pressure equalizing valve device, characterized in that it comprises

[0008] The two-position five-way valve body can dynamically adjust the pressure of the SCR side pipeline and the host side pipeline, so that the pressure between them is in a pressure balance state, and the surge phenomenon of the supercharger can be effectively avoided. The first port of the two-position five-way valve body is in communication with the control air system capable of controlling air entering the inside, the second port of the two-position five-way valve body is in communication with the pilot valve of the SCR outlet valve, the third port of the two-position five-way valve body is in communication with the external atmosphere, the fourth port of the two-position five-way valve body is in communication with the SCR side pipeline, and the fifth port of the two-position five-way valve body is in communication with the host side pipeline.

[0009] In a preferred embodiment of the present application, the first port of the two-position five-way valve body is in communication with the control air system capable of controlling air entering the inside through a control air inlet pipeline.

[0010] In a preferred embodiment of the present application, the fourth port of the two-position five-way valve body is in communication with the SCR side pipeline through an SCR side sampling pipe, and an SCR side pressure gauge for monitoring the pressure inside the SCR side sampling pipe in real time is arranged on the SCR side sampling pipe.

[0011] In a preferred embodiment of the present application, a maintenance switch valve for facilitating maintenance of the SCR side pipeline is further arranged on the SCR side sampling pipe.

[0012] In a preferred embodiment of the present application, the fifth port of the two-position five-way valve body is in communication with the host side pipeline through a host side sampling pipe, and a host side pressure gauge for monitoring the pressure inside the host side sampling pipe in real time is arranged on the host side sampling pipe.

[0013] Compared with the prior art, the pressure equalizing valve device has reasonable overall design, simple structure and convenient operation, can effectively avoid the surge phenomenon of the host supercharger, not only improves the service life of the supercharger, but also reduces the probability of safety accidents of the ship, and brings great convenience to the pressure regulation work of the SCR side pipeline and the host side pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0015] Fig. 1 It is a structural schematic diagram of the present application.

[0016] Fig. 2 It is a structural schematic diagram of the two-position five-way valve body of the present application. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in combination with specific drawings.

[0018] Referring to Figs. 1-2 As shown in the figure, a marine SCR equalizing valve device is given, which comprises a two-position five-way valve body 100 capable of dynamically adjusting the pressure of the SCR side pipeline and the main engine side pipeline to keep the pressure balance between them and effectively avoid the surge phenomenon of the supercharger.

[0019] The first port 110 of the two-position five-way valve body 100 is in communication with a control air system capable of controlling air entering its interior, the second port 120 of the two-position five-way valve body 100 is in communication with the pilot valve of the SCR outlet valve, the third port 130 of the two-position five-way valve body 100 is in communication with the external atmosphere, the fourth port 140 of the two-position five-way valve body 100 is in communication with the SCR side pipeline, and the fifth port 150 of the two-position five-way valve body 100 is in communication with the main engine side pipeline.

[0020] The first port 110 of the two-position five-way valve body 100 is in communication with a control air system capable of controlling air entering its interior through a control air inlet pipeline 400, and the control air system can control the external air to be delivered to the first port 110 of the two-position five-way valve body 100 through the control air inlet pipeline 400.

[0021] The fourth port 140 of the two-position five-way valve body 100 is in communication with the SCR side pipeline through an SCR side sampling pipe 300, and an SCR side pressure gauge 310 for real-time monitoring of the internal pressure of the SCR side sampling pipe 300 is arranged on the SCR side sampling pipe 300. Through the SCR side pressure gauge 310, the operator can directly observe the pressure inside the SCR side sampling pipe 300, and can make corresponding emergency operation in time when abnormal situation occurs.

[0022] A maintenance switch valve 320 for facilitating maintenance of the SCR side pipeline is also arranged on the SCR side sampling pipe 300. The arrangement of the maintenance switch valve 320 can facilitate the maintenance personnel to perform maintenance operation on the SCR side pipeline, i.e. the maintenance switch valve 320 is closed when maintenance operation is performed on the SCR side pipeline.

[0023] The fifth port 150 of the two-position five-way valve body 100 is in communication with the main engine side pipeline through a main engine side sampling pipe 200, and a main engine side pressure gauge 210 for real-time monitoring of the internal pressure of the main engine side sampling pipe is arranged on the main engine side sampling pipe 200. Through the main engine side pressure gauge 210, the operator can directly observe the pressure inside the main engine side sampling pipe, and can make corresponding emergency operation in time when abnormal situation occurs.

[0024] The working principle of the present application is as follows:

[0025] The spring inside the two-position five-way valve body judges the pressure difference between the SCR side pipeline and the main engine side pipeline through its compression state. When the pressure difference is normal, the pressure of the fifth port of the two-position five-way valve body is slightly less than the pressure of its fourth port, the internal spring is in a relaxed state, the two-position five-way valve body is in a conduction position, the first port and the second port of the two-position five-way valve body are in conduction, so that the air introduced by the control air system can enter the pilot valve of the SCR outlet valve through the second port; if the load of the main engine suddenly changes and the pressure of the SCR side pipeline is significantly higher than the pressure of the main engine side pipeline, the spring inside the fifth port of the two-position five-way valve body is compressed, the first port and the second port are cut off, and the second port and the third port of the two-position five-way valve body are in conduction, so that the air in the pilot valve of the SCR outlet valve is discharged into the atmosphere environment from the third port. The pilot valve of the SCR outlet valve loses the effect of air, causing the air cylinder of the SCR outlet valve to be depressurized and unable to maintain a closed state, so as to be forced to open, realizing the through connection of the SCR side pipeline and the main engine side pipeline, reducing the pressure difference between the two sides, reducing the load fluctuation of the main engine supercharger, and greatly reducing the possibility of supercharger surge caused by excessive load change.

[0026] In summary, the pressure equalizing valve device of the present application has reasonable overall design, simple structure and convenient operation, can effectively avoid the surge phenomenon of the main engine supercharger, not only improves the service life of the supercharger, but also reduces the probability of safety accidents of the ship, and brings great convenience to the pressure regulation work of the SCR side pipeline and the main engine side pipeline.

[0027] The above shows and describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A marine SCR pressure equalizing valve device, characterized in that, include A two-position five-way valve body capable of dynamically adjusting the pressure between the SCR side pipeline and the main unit side pipeline to maintain a pressure balance and effectively prevent the booster from surging. The first port of the two-position five-way valve body is connected to a control air system that controls the air entering its interior. The second port of the two-position five-way valve body is connected to the pilot valve of the SCR outlet valve. The third port of the two-position five-way valve body is connected to the outside atmosphere. The fourth port of the two-position five-way valve body is connected to the SCR side pipeline. The fifth port of the two-position five-way valve body is connected to the main unit side pipeline. The spring inside the 2-position 5-way valve body determines the pressure difference between the SCR side pipeline and the main unit side pipeline by its compression state. When the pressure difference is normal, the pressure at the fifth port of the 2-position 5-way valve body is slightly less than the pressure at its fourth port, and its internal spring is in a relaxed state. The 2-position 5-way valve body is in the open position, and the first and second ports of the 2-position 5-way valve body are open, allowing the air introduced by the control air system to enter the pilot valve of the SCR outlet valve through the second port. If the main unit load changes suddenly and the pressure in the SCR side pipeline is significantly higher than the pressure in the main unit side pipeline, the spring inside the fifth port of the 2-position 5-way valve body is compressed, the first and second ports are closed, and the second and third ports of the 2-position 5-way valve body are open, allowing the air in the pilot valve of the SCR outlet valve to be released into the atmosphere through the third port.

2. The marine SCR pressure equalizing valve device as described in claim 1, characterized in that: The first port of the two-position five-way valve body is connected to a control air system that can control the air entering its interior via a control air inlet pipe.

3. The marine SCR pressure equalizing valve device as described in claim 1, characterized in that: The fourth port of the two-position five-way valve body is connected to the SCR side pipeline through the SCR side sampling pipe, and an SCR side pressure gauge is provided on the SCR side sampling pipe for real-time monitoring of its internal pressure.

4. The marine SCR pressure equalizing valve device as described in claim 3, characterized in that: The SCR side sampling pipe is also equipped with a maintenance switch valve to facilitate maintenance of the SCR side pipeline.

5. The marine SCR pressure equalizing valve device as described in claim 1, characterized in that: The fifth port of the two-position five-way valve body is connected to the host side pipeline through the host side sampling pipe, and the host side sampling pipe is equipped with a host side pressure gauge for real-time monitoring of its internal pressure.

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