Metering device and flue gas treatment equipment

Abstract

The utility model discloses a metering device and flue gas treatment equipment. The metering device comprises a first pipe, a second pipe, a purging pipe, a proportional valve and a purging valve; the first pipe is used for conveying compressed air; the second pipe and the first pipe are arranged in parallel at an interval; the second pipe is used for conveying a reducing agent; the first end of the purging pipe is communicated to the first pipe, the second end of the purging pipe is communicated to the second pipe, and the purging pipe is a hose; the proportional valve is arranged on the second pipe; the purging valve is arranged on the purging pipe and used for controlling the purging pipe to be connected or disconnected. Therefore, the first pipe and the second pipe are arranged in parallel at an interval, the space environment of the interval between the first pipe and the second pipe is simple, parts of the metering device can be maintained or replaced in the interval, and the operation of maintaining or replacing the parts of the metering device is convenient; and a hose is arranged, so that the purging pipe is convenient to place.

Description

Technical Field

[0001] The utility model relates to the field of ship smoke treatment, in particular to a metering device and smoke treatment equipment. Background Art

[0002] Nitrogen oxides (NOx) are a major cause of air pollution. They not only contribute to acid rain and photochemical smog, but also damage the ozone layer and harm the human body. With growing environmental awareness, NOx emissions are receiving increased attention. The shipping industry has also begun to regulate NOx emissions, with diesel engine exhaust from ships being a major source of air pollution in coastal and port areas.

[0003] The Annex to the International Maritime Organization's "Regulations for the Prevention of Air Pollution from Ships" proposed and established emission control areas to effectively control atmospheric pollution emissions from ships. The emission standards for NOx were officially implemented on January 1, 2016.

[0004] Currently, the primary method used by the marine industry to reduce NOx emissions from diesel engines is selective catalytic reduction (SCR). This involves a catalyst that selectively reacts a reducing agent with NOx to produce harmless N2 and H2O. SCR technology offers high NOx conversion rates, no impact on the original diesel engine's performance, and is mature and widely used. It is widely recognized as the most important post-treatment technology, meeting not only current NOx emission standards but also future, even more stringent ones.

[0005] The key to SCR technology is to evenly mix NOx and reducing agent in proportion, and the metering device controls the amount of reducing agent and is a key component of the SCR system.

[0006] Existing metering devices include a compressed air pipe for delivering compressed air and a reducing agent pipe for delivering reducing agent. Both the compressed air pipe and the reducing agent pipe extend in a curved pattern, creating a complex spatial structure in the gap between them. Several components of the metering device are located within this space, making it difficult to maintain these components within this complex spatial structure.

[0007] To this end, the present invention provides a metering device and a flue gas treatment device to at least partially solve the above problems. Utility Model Content

[0008] The Summary of the Utility Model introduces a series of simplified concepts that will be further described in the Specific Examples. The Summary of the Utility Model does not intend to limit the key features and essential technical features of the claimed technical solution, nor does it intend to determine the scope of protection of the claimed technical solution.

[0009] In order to at least partially solve the above technical problems, the present invention provides a metering device, which includes:

[0010] A first pipe, the first pipe is used to transport compressed air;

[0011] a second tube, the second tube being parallel to and spaced apart from the first tube, and being used for conveying the reducing agent;

[0012] A purge pipe, wherein the first end of the purge pipe is connected to the first pipe, the second end of the purge pipe is connected to the second pipe, and the purge pipe is a hose;

[0013] A proportional valve is provided on the second pipe;

[0014] The purge valve is arranged on the purge pipe to control the conduction or cutoff of the purge pipe.

[0015] According to the metering device of the present invention, the first tube and the second tube are arranged in parallel and at intervals. The space environment between the first tube and the second tube is simple, and the parts of the metering device can be repaired or replaced within this interval. The operation of repairing or replacing the parts of the metering device is convenient; the setting of the hose makes it convenient to place the purge tube.

[0016] Optionally, the purge tube is a transparent tube.

[0017] Optionally, the metering device also includes a shell, the shell has a first port, a second port, a third port and a fourth port, the first tube and the second tube are both located in the shell, one end of the first tube is connected to the first port, the other end of the first tube is connected to the second port, one end of the second tube is connected to the third port, and the other end of the second tube is connected to the fourth port.

[0018] Optionally, the axial direction of the first tube and the axial direction of the second tube are both parallel to the horizontal direction.

[0019] Optionally, the position of the first tube is higher than the position of the second tube.

[0020] Optionally, the metering device further includes a first valve provided on the first pipe, and a second valve provided on the second pipe, and one of the purge valve, the first valve and the second valve is an electric ball valve.

[0021] Optionally, along the flow direction of the fluid flowing through the first pipe, the first end of the purge pipe is located upstream of the first valve,

[0022] Along the flow direction of the fluid flowing through the second pipe, the second end of the purge pipe is located downstream of the second valve.

[0023] Optionally, the metering device further includes a pressure reducing valve, which is arranged on the first pipe.

[0024] Optionally, the metering device further includes a pressure sensor, and both the first tube and the second tube are provided with a pressure sensor.

[0025] The utility model also provides a flue gas treatment device, which includes the aforementioned metering device.

[0026] According to the flue gas treatment equipment of the present invention, the flue gas treatment equipment includes the aforementioned metering device, the first tube and the second tube are parallel and spaced apart, the space environment between the first tube and the second tube is simple, and the parts of the metering device can be repaired or replaced within this space, and the operation of repairing or replacing the parts of the metering device is convenient; the setting of the hose facilitates the placement of the purge tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to make the advantages of the present invention more easily understood, the present invention briefly described above will be described in more detail with reference to specific embodiments shown in the accompanying drawings. It will be understood that these drawings depict only typical embodiments of the present invention and are therefore not to be considered as limiting the scope of protection thereof. The accompanying drawings describe and explain the present invention with additional specificity and detail.

[0028] Figure 1 It is a schematic structural diagram of a metering device according to a preferred embodiment of the present utility model.

[0029] Description of Reference Numerals

[0030] 110: First tube 120: Second tube

[0031] 130: Purge pipe 140: Shell

[0032] 141: First bite 142: Second bite

[0033] 143: The third mouth 144: The fourth mouth

[0034] 150: First valve 151: Second valve

[0035] 152: Purge valve 160: Proportional valve

[0036] 161: Pressure reducing valve 162: Flow meter

[0037] 163: Pressure sensor DETAILED DESCRIPTION

[0038] In the following description, numerous specific details are provided to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without one or more of these details. In other instances, certain technical features known in the art are not described to avoid confusion with embodiments of the present invention.

[0039] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be noted that the terms "upper", "lower" and similar expressions used herein are for illustrative purposes only and are not intended to be limiting.

[0040] In this document, ordinal numbers such as “first” and “second” cited in the present invention are merely identifiers and do not have any other meanings, such as a specific order.

[0041] To thoroughly understand the embodiments of the present invention, a detailed structure will be provided in the following description. Obviously, the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. Preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other embodiments.

[0042] The utility model provides a metering device that can supply a reducing agent and compressed air to a flue gas treatment device as needed. The flue gas treatment device treats ship flue gas using SCR technology. The reducing agent and compressed air are both fluids.

[0043] Please refer to Figure 1 The metering device includes a first tube 110 and a second tube 120. The first tube 110 is used to transport compressed air to provide compressed air. The second tube 120 is used to transport a reducing agent to provide a reducing agent. The second tube 120 is arranged parallel to the first tube 110 and spaced apart. The space between the first tube 110 and the second tube 120 provides a simple space environment. Metering device components can be repaired or replaced within this space, making repair or replacement of metering device components convenient.

[0044] like Figure 1 As shown, the metering device further includes a purge tube 130. The first end of the purge tube 130 is connected to the first tube 110. The second end of the purge tube 130 is connected to the second tube 120. Thus, after the metering device has finished providing the reducing agent, the first tube 110 can be connected to the second tube 120 via the purge tube 130, allowing compressed air to enter the second tube 120, thereby purging the interior of the second tube 120 and removing the reducing agent from the second tube 120.

[0045] The metering device includes a valve, which includes a purge valve 152 . The purge valve 152 is provided on the purge pipe 130 to control the conduction or cutoff of the purge pipe 130 .

[0046] The metering device further includes a proportional valve 160. The proportional valve 160 is provided on the second pipe 120. Thus, the flow rate of the reducing agent transported by the second pipe 120 can be controlled by the proportional valve 160.

[0047] Optionally, the purge pipe 130 is a hose, which makes it easier to place the purge pipe 130 .

[0048] In this embodiment, the first tube 110 and the second tube 120 are arranged in parallel and at intervals. The space environment between the first tube 110 and the second tube 120 is simple, and the parts of the metering device can be repaired or replaced within this interval, and the operation of repairing or replacing the parts of the metering device is convenient; the setting of the hose facilitates the placement of the purge tube 130.

[0049] Optionally, the purge tube 130 is a transparent tube. Thus, whether the compressed air flows toward the second tube 120 can be observed through the purge tube 130.

[0050] Alternatively, as Figure 1 As shown, the metering device also includes a shell 140. The shell 140 has an internal cavity, a first port 141, a second port 142, a third port 143 and a fourth port 144. The first port 141, the second port 142, the third port 143 and the fourth port 144 are all connected to the internal cavity. The first tube 110 and the second tube 120 are located in the internal cavity of the shell 140. One end of the first tube 110 is connected to the first port 141. The other end of the first tube 110 is connected to the second port 142. One end of the second tube 120 is connected to the third port 143. The other end of the second tube 120 is connected to the fourth port 144. In this way, the first tube 110 and the second tube 120 can be protected. In addition, the metering device constitutes a modular component. This facilitates the repair of the flue gas treatment equipment.

[0051] like Figure 1 As shown, the axial direction of the first tube 110 and the axial direction of the second tube 120 are both parallel to the horizontal direction. Thus, the accumulation of the reducing agent in the second tube 120 can be reduced, and the service life of the second tube 120 can be increased.

[0052] like Figure 1 As shown, the first tube 110 is located above the second tube 120. As a result, the reducing agent in the second tube 120 can be purged more effectively.

[0053] Optionally, the valve further includes a first valve 150 and a second valve. The first valve 150 is disposed on the first pipe 110 to control the flow of the first pipe 110. The second valve 151 is disposed on the second pipe 120 to control the flow of the second pipe 120. At least one of the first valve 150, the second valve 151, and the purge valve 152 is an electric ball valve.

[0054] The electric ball valve utilizes a spherical seal, enabling better control of the flow and shutoff of the pipelines (first pipe 110, second pipe 120, and purge pipe 130). Furthermore, the sealing spool of the electric ball valve has a longer service life, thereby reducing the maintenance cost of the metering device. Furthermore, the electric ball valve has a manual opening and closing function, allowing for manual control of the flow and shutoff of the pipelines in unexpected situations, facilitating subsequent inspection and maintenance of the metering device.

[0055] Furthermore, along the flow direction of the fluid (compressed air) flowing through the first tube 110 , the first end of the purge tube 130 is located upstream of the first valve 150 .

[0056] Along the flow direction of the fluid (reducing agent) flowing through the second pipe 120, the second end of the purge pipe 130 is located downstream of the second valve 151. Therefore, the portion of the second pipe 120 located downstream of the second valve 151 can be easily purged.

[0057] Alternatively, as Figure 1 As shown, the metering device further includes a pressure reducing valve 161 and a flow meter 162. The pressure reducing valve 161 is provided in the first pipe 110. The pressure in the first pipe 110 can be controlled by the pressure reducing valve 161.

[0058] The flow meter 162 includes a first flow meter and a second flow meter (not shown). The first flow meter is provided in the first pipe 110 to detect the flow rate of the compressed air entering the first pipe 110. In the first pipe 110, the first flow meter is located upstream of the first end of the purge pipe 130 along the flow direction of the compressed air.

[0059] The second flow meter is provided in the second pipe 120. In the second pipe 120, along the flow direction of the reducing agent, the second flow meter is located upstream of the proportional valve 160. In this way, the flow rate of the reducing agent entering the second pipe 120 can be detected by the second flow meter.

[0060] Please continue to refer to Figure 1The metering device further includes a pressure sensor 163. Pressure sensor 163 may be a pressure gauge. Pressure sensor 163 includes a first pressure sensor and a second pressure sensor. The first pressure sensor is disposed in first tube 110 to detect the pressure within first tube 110. Along the flow direction of the compressed air within first tube 110, a flow meter 162, a first pressure sensor, the first end of purge tube 130, a pressure reducing valve 161, a first valve 150, and another first pressure sensor are sequentially disposed. This allows for constant monitoring of the pressure within first tube 110.

[0061] A second pressure sensor is installed in the second pipe 120 to detect the pressure within the second pipe 120. Along the flow direction of the reducing agent in the second pipe 120, a second pressure sensor, a second valve 151, another second pressure sensor, a proportional valve 160, and the second end of the purge pipe 130 are sequentially installed. Thus, the pressure within the second pipe 120 can be constantly monitored.

[0062] When using the metering device, open first valve 150 and second valve 151. Close purge valve 152. At this point, compressed air can enter first tube 110 from first port 141, flow through first tube 110, and then exit first tube 110 from second port 142. During this process, the pressure within first tube 110 can be detected by a first pressure sensor and controlled by pressure reducing valve 161. The flow rate of compressed air entering first tube 110 can be detected by a first flowmeter.

[0063] The reducing agent enters the second pipe 120 through the third port 143, flows through the second pipe 120, and is then discharged from the second pipe 120 through the fourth port 144. During this process, the pressure in the second pipe 120 can be detected by the second pressure sensor, and the flow rate of the reducing agent input into the second pipe 120 can be detected by the second flow meter. The flow rate of the reducing agent discharged from the second pipe 120 is controlled by the proportional valve 160.

[0064] After the metering device finishes providing the reducing agent, the second tube 120 needs to be purged to remove the reducing agent in the second tube 120. At this time, the purge valve 152 is opened, the first valve 150 and the second valve 151 are closed, and compressed air is passed from the first tube 110 through the purge pipe 130 into the second tube 120, and then discharged from the second tube 120 through the fourth port 144, thereby removing the reducing agent in the second tube 120.

[0065] The utility model also provides a flue gas treatment device, which includes the aforementioned metering device.

[0066] In this embodiment, the flue gas treatment equipment includes the aforementioned metering device, the first tube 110 and the second tube 120 are parallel and spaced apart, the space environment between the first tube 110 and the second tube 120 is simple, and the parts of the metering device can be repaired or replaced within this space, and the operation of repairing or replacing the parts of the metering device is convenient; the setting of the hose facilitates the placement of the purge tube 130.

[0067] The present invention has been described through the above embodiments. However, it should be understood that the above embodiments are for illustrative and illustrative purposes only and are not intended to limit the present invention to the described embodiments. Furthermore, those skilled in the art will appreciate that the present invention is not limited to the above embodiments and that various variations and modifications may be made based on the teachings of the present invention, all of which fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

[0068] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. Terms such as "component" and the like appearing herein may refer to either a single part or a combination of multiple parts. Terms such as "installation" and "setting" appearing herein may refer to either a component being directly attached to another component or a component being attached to another component through an intermediate. Features described herein in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise stated.

Claims

1. A metering device, characterized in that: The metering device comprises: a first pipe, the first pipe being used to transport compressed air; a second tube, the second tube being parallel to and spaced apart from the first tube, and being used for conveying a reducing agent; a purge pipe, wherein a first end of the purge pipe is connected to the first pipe, a second end of the purge pipe is connected to the second pipe, and the purge pipe is a hose; a proportional valve, the proportional valve being arranged on the second pipe; A purge valve is provided on the purge pipe to control the conduction or cutoff of the purge pipe.

2. The metering device according to claim 1, characterized in that The purge tube is a transparent tube.

3. The metering device according to claim 1, characterized in that The metering device also includes a shell having a first port, a second port, a third port, and a fourth port. The first tube and the second tube are both located in the shell. One end of the first tube is connected to the first port, and the other end of the first tube is connected to the second port. One end of the second tube is connected to the third port, and the other end of the second tube is connected to the fourth port.

4. The metering device according to claim 1, characterized in that The axial direction of the first tube and the axial direction of the second tube are both parallel to the horizontal direction.

5. The metering device according to claim 1, characterized in that The position of the first tube is higher than the position of the second tube.

6. The metering device according to claim 1, characterized in that The metering device further includes a first valve provided on the first pipe, and a second valve provided on the second pipe, and one of the purge valve, the first valve, and the second valve is an electric ball valve.

7. The metering device according to claim 6, characterized in that Along the flow direction of the fluid flowing through the first pipe, the first end of the purge pipe is located upstream of the first valve, Along the flow direction of the fluid flowing through the second pipe, the second end of the purge pipe is located downstream of the second valve.

8. The metering device according to claim 1, characterized in that The metering device further includes a pressure reducing valve, which is arranged on the first pipe.

9. The metering device according to claim 1, characterized in that The metering device further includes a pressure sensor, and both the first tube and the second tube are provided with the pressure sensor.

10. A flue gas treatment device, characterized in that: The flue gas treatment equipment comprises a metering device according to any one of claims 1 to 9.

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