Integrated Installation Structure and Method of Valve Control Elements of Reactors in SCR Systems

Abstract

The present invention discloses an integrated installation structure and method for valve control elements of a reactor in an SCR system, including a fixing plate. Along the four sides of the fixing plate, a main gas source pipe is installed. A stop valve and a needle valve are installed on the pipeline at one end of the main gas source pipe. The pipeline where the stop valve is located and the pipeline where the needle valve is located are arranged in parallel. An air-operated valve is installed below the center line of the fixing plate. The inlet of the air-operated valve is connected to the main gas source pipe, and the outlet is connected to a control valve. The integrated installation structure of the control elements of the present invention integrates the valve control elements of the reactor in the SCR system on the fixing plate, clarifies the fixed installation positions for each control element, improves the installation efficiency, and avoids situations such as incorrect connection and missed connection caused by excessive pipelines.

Description

Technical Field

[0001] The present invention belongs to the technical field of control element installation. Specifically, it relates to an integrated installation structure and method for valve control elements of a reactor in an SCR system. Background Art

[0002] The statements herein only provide background art related to the present invention and do not necessarily constitute prior art.

[0003] The SCR system is a device for controlling the post-treatment of diesel engine emissions. The function of the SCR system is to remove NOx in the exhaust gas of the diesel engine. The system uses urea as a reducing agent (also known as AdBlue). Under the reduction of a selective catalyst, NOx is reduced to nitrogen and water. The SCR system includes an aqueous urea storage tank, a conveying device, a metering device, an injection device, a catalytic converter, and temperature and exhaust gas sensors, etc.

[0004] Currently configured SCR systems usually have two operating modes. When operating in Tier II mode, the SCR system cuts off the reactor seal valve (RSV) and the reactor throttle valve (RTV), and the reactor bypass valve (RBV) will open, and the exhaust gas directly flows into the turbocharger. When operating in Tier III mode, the SCR system will be turned on, the valves RSV and RTV will open, and the RBV will close. The RSV valve is opened or closed according to the pressure change before and after the RTV valve. In the existing SCR system, there is no clear installation position and installation bracket for the control elements of the RSV valve and the RTV valve, and there are only reference drawings such as schematic diagrams and sketch diagrams, and the product quality cannot be guaranteed. At the same time, there are position interference situations, resulting in a lot of rework for electrical and control pipelines. In addition, many cross operations also affect the overall construction, resulting in problems such as long construction period and high pressure. Therefore, currently, construction can only rely on experience and the actual situation on site. Due to the chaotic installation position of the control elements and the relatively long distance from the valves to be controlled, the installation efficiency is low, and it is easy to have situations such as wrong connection, missed connection, and poor fixation during long-distance pipeline laying. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide an integrated installation structure and method for valve control elements of a reactor in an SCR system. An air source main pipe is installed on a fixing plate, and a plurality of scattered control elements are connected to the air source main pipe. The fixing plate is installed at a position close to the RSV valve and the RTV valve, shortening the distance between the control elements and the control valves, reducing the length of the pipelines required for the entire mechanical control, thereby reducing the installation time required, reducing costs and avoiding mistakes caused by too long pipelines.

[0006] To achieve the above purpose, the present invention is realized through the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention provides an integrated installation structure of valve control elements for a reactor in an SCR system, including a fixing plate, along the four sides of which a main gas source pipe is installed. A stop valve and a needle valve are installed on the pipeline at one end of the main gas source pipe. The pipeline where the stop valve is located and the pipeline where the needle valve is located are arranged in parallel. A pneumatic valve is installed below the center line of the fixing plate. The inlet of the pneumatic valve is connected to the main gas source pipe, and the outlet is connected to a control valve.

[0008] As a further technical solution, the main gas source pipe is fixed to the fixing plate by a single-ear pipe clamp.

[0009] As a further technical solution, the pneumatic valve is fixed to the fixing plate by a support member.

[0010] As a further technical solution, a pressure gauge is installed on the inlet pipeline of the pneumatic valve.

[0011] As a further technical solution, the main gas source pipe is 3 - 5 cm away from the edge of the fixing plate.

[0012] As a further technical solution, the control air inlet of the main gas source pipe is arranged on the main gas source pipe below the pneumatic valve.

[0013] As a further technical solution, a throttle valve is installed at the control air inlet.

[0014] As a further technical solution, the stop valve, the needle valve, the pneumatic valve, and the throttle valve are all located on the center line of the fixing plate.

[0015] In a second aspect, an embodiment of the present invention provides an integrated installation method for control elements of an SCR system of a diesel engine, including the following steps:

[0016] (1) Install the needle valve, the stop valve, and the throttle valve on the main gas source pipe, and fix the main gas source pipe to the fixing plate by a single-ear pipe clamp;

[0017] (2) Fix the pneumatic valve below the center line of the fixing plate by a support member, install the inlet and outlet pipelines and the bleed pipeline of the pneumatic valve, and install a pressure gauge on the inlet pipeline. Then, connect the inlet pipeline to the main gas source pipe by a reducing tee;

[0018] (3) Install pipe straight-through joints on the outlet pipeline of the pneumatic valve and the inlet and outlet pipelines of the main gas source pipe;

[0019] (4) Check and confirm the integrity of all connection components to complete the integrated installation of the control elements.

[0020] As a further technical solution, during use, both ends of the main gas source pipe are connected in series before and after the RTV valve, and the control air inlet of the main gas source pipe is connected to the air compressor; the outlet pipeline of the pneumatic valve is connected to the RSV valve.

[0021] The beneficial effects of the above embodiments of the present invention are as follows:

[0022] In the present invention, the valve control elements of the reactor in the SCR system of the diesel engine are centrally installed on the fixed plate, and then the fixed plate is installed at a position close to the control valve, shortening the distance between the control element and the control valve, reducing the length of the pipeline required for the entire mechanical control, clarifying the fixed installation positions of the control elements in the SCR system, improving the installation efficiency, simplifying the pipeline laying, avoiding connection errors, leakage and other situations caused by too many pipelines, saving materials, reducing the construction time, and saving costs.

[0023] The integrated installation structure of the control elements of the present invention can be mass-produced and directly used during the pipeline laying of the SCR system, improving the pipeline laying efficiency. Description of the Drawings

[0024] The attached drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0025] Figure 1 It is a schematic diagram of the integrated installation structure of the present invention.

[0026] The schematic diagram is only for illustration;

[0027] Among them, 1. needle valve, 2. globe valve, 3. pressure gauge, 4. pneumatic valve, 5. throttle valve, 6. first end joint, 7. tee, 8. first single-ear pipe clamp, 9. first copper pipe, 10. support, 11. second straight joint, 12. first copper pipe, 13. adapter joint, 14. three-way joint, 15. combined pipe clamp, 16. first straight joint, 17. first right-angle joint, 18. second copper pipe, 19. third copper pipe, 20. second single-ear pipe clamp, 21. second copper pipe, 22. third copper pipe, 23. fourth copper pipe, 24. fifth copper pipe, 25. sixth copper pipe, 26. second end joint, 27. adjustable right-angle joint, 28. reducing tee, 29. fixed plate, 30. fourth copper pipe, 31. fifth Copper pipe, 32, Sixth Copper pipe, 33, Seventh Copper pipe. Detailed implementation mode

[0028] It should be noted that the following detailed description is illustrative and aims to provide further description of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0029] Embodiment 1

[0030] In a typical implementation mode of the present invention, as Figure 1 shown, a SCR system control element integrated installation structure for a diesel engine is proposed, including a fixing plate 29. A gas source main pipe is installed along the four sides of the fixing plate. A stop valve 2 and a needle valve 1 are installed on the pipeline at one end of the gas source main pipe. The pipeline where the stop valve 2 is located and the pipeline where the needle valve 1 is located are arranged in parallel. A pneumatic valve 4 is installed below the center line of the fixing plate 29. The inlet of the pneumatic valve 4 is connected to the gas source main pipe, and the outlet is connected to a control valve.

[0031] The gas source main pipe is a copper pipe with a diameter of 16 mm, including, First Copper pipe 9, Second Copper pipe 21, Third Copper pipe 22, Fourth Copper pipe 23, Fifth Copper pipe 24, Sixth Copper pipe 25, Seventh Copper pipe 33; among them, Seventh Copper pipe 33 and Sixth Copper pipe 25 are connected in parallel and are connected to the Second Copper pipe 21 through a tee; Seventh Copper pipe 33 is connected to the Fifth Copper pipe 24 through a first right-angle joint 17, Sixth Copper pipe 25 is connected to the Fifth Copper pipe 24 through a tee 7, First Copper pipe 9, Fourth Copper pipe 23, Third Copper pipe 22 are connected in sequence to form the gas source main pipe.

[0032] Each pipe section of the gas source main pipe is fixed on the fixing plate by a plurality of first single-ear pipe clamps 8. First straight-through joints 16 are installed at both ends of the gas source main pipe, and are connected to the front and back of the RTV valve through the first straight-through joints. The two ends of the gas source main pipe are arranged in parallel and are fixed on the fixing plate by a combined pipe clamp 15.

[0033] Seventh A needle valve 1 is provided on the copper pipe 33. The needle valve 1 is used to adjust the air intake of the pneumatic valve 4. Sixth A stop valve 2 is provided on the copper pipe 25, which is used to cooperate with the needle valve 1 to adjust the air intake of the pneumatic valve 4 and is in an open state during normal operation. The first A control air intake port is provided on the copper pipe 9. A throttle valve 5 is installed at the control air intake port to adjust the intake pressure entering the air supply main pipe. The throttle valve 5 is installed on the air supply main pipe through the first end joints 6 on both sides.

[0034] The pneumatic valve 4 is installed below the center line of the fixed plate through two support members 10 and is located above the first copper pipe 9. Further, the needle valve 1, the stop valve 2, the pneumatic valve 4 and the throttle valve 5 are on the same straight line, that is, they are all on the center line of the fixed plate, making the arrangement of each control element on the fixed plate more compact and reasonable.

[0035] The pipes connected to the pneumatic valve 4 are all copper pipes with a diameter of 10 mm, including the first copper pipe 12, the second copper pipe 18, the third copper pipe 19, the fourth copper pipe 30, the fifth copper pipe 31, the sixth copper pipe 32. Among them, the third copper pipe 19 is installed on the air intake of the pneumatic valve through the second end joint 26, is connected to the air supply main pipe through a reducing tee, and the pressure gauge is installed on the third copper pipe 19 through the adapter joint 13 and the three-way joint 14; the second copper pipe 18 is installed on another air intake of the pneumatic valve through the second end joint, is connected to the air supply main pipe through a reducing tee, and the pressure gauge is installed on the third copper pipe 32 through the adapter joint and the three-way joint. The pressure gauge is used to measure the intake pressure of the pneumatic valve.

[0036] In addition, the first copper pipe 12, the fourth copper pipe 30, the fifth copper pipe 31 are also installed on the pneumatic valve 4. Among them, the first copper pipe 12 and the fifth copper pipe 31 are connected to the RSV valve to control the opening and closing of the RSV valve. The fourth copper pipe 30 is the air release port of the pneumatic valve.

[0037] In some embodiments, the air supply main pipe is 3-5 cm away from the edge of the fixed plate. The pressure gauge, the pneumatic valve and some installation pipes are all arranged inside the air supply main pipe, making the control elements on the entire fixed plate more concentrated.

[0038] The working principle of the control components on the fixing plate is as follows: Second The second copper pipe 21 and the third After the second copper pipe 22 is connected to the front and back of the RTV valve, the pressure gauge senses the pressure change situation before and after the RTV valve. When the pressure difference before and after does not reach 0.5 - 0.8 bar, the pneumatic valve 4 and the RSV valve are in the closed state. When the pressure difference before and after reaches 0.5 - 0.8 bar, the pneumatic valve 4 automatically controls the RSV valve to open.

[0039] The specific working process includes:

[0040] Adjustment before operation, opening / closing adjustment of the pneumatic valve 4. When the main engine stops, the SCR system controls the opening of the control air and the safety air. Open the needle valve 1 and close the stop valve 2, so that the control air with a pressure of 7 bar enters the entire air source main pipeline through the throttle valve 5. Slowly close the needle valve 1 so that the pressure of the second copper pipe 18 is less than the pressure of the second copper pipe 19 by 0.5 - 0.8 bar (the working pressure of the pneumatic valve). Adjust the knob of the pneumatic valve 4, and through the first copper pipe 12, open the RSV valve (this valve is not on the fixing plate), and then lock the adjustment knob of the pneumatic valve to complete the adjustment before operation.

[0041] During operation, close the needle valve 1 and open the stop valve 2, so that the control air with a pressure of 7 bar enters the entire air source main pipeline through the throttle valve 5. When the pressure in the second copper pipe 18 and the second copper pipe 19 is the same, the pneumatic valve 4 does not act, and the RSV valve remains closed; when the pressure of the second copper pipe 18 is less than the pressure of the second copper pipe 19 by 0.5 - 0.8 bar, the pneumatic valve 4 acts, and through the first copper pipe 12, open the RSV valve (this valve is not on the fixing plate).

[0042] In the integrated installation structure of this embodiment, the valve control components of the reactor in the SCR system of the diesel engine are integrally installed on the fixing plate, which defines the fixed installation positions for each control component and improves the installation efficiency; at the same time, only by adjusting the pneumatic valve on the fixing plate before the SCR system operates, it is possible to realize the automatic opening and closing of the RSV valve during the operation of the SCR system.

[0043] Embodiment 2

[0044] An integrated installation method for the valve control components of the reactor in an SCR system includes the following steps:

[0045] (1) Install the needle valve, globe valve, and throttle valve on the main air supply pipe, and fix the main air supply pipe on the fixed plate using a single-ear pipe clamp;

[0046] (2) Fix the pneumatic valve below the center line of the fixed plate using a support, install the air inlet and outlet pipes and the air release pipe of the pneumatic valve, install a pressure gauge on the air inlet pipe, and then connect the air inlet pipe to the main air supply pipe using a reducing tee;

[0047] (3) Install straight-through pipe joints on the air outlet pipe of the pneumatic valve and the air inlet and outlet pipes of the main air supply pipe;

[0048] (4) Check and confirm the integrity of all connection components to complete the integrated installation of the control elements.

[0049] Further, during use, both ends of the main air supply pipe are connected in series before and after the RTV valve, and the control air inlet of the main air supply pipe is connected to the air compressor; the air outlet pipe of the pneumatic valve is connected to the RSV valve.

[0050] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An integrated installation structure of valve control elements for a reactor in an SCR system, characterized in that, It includes a fixed plate, and a main air supply pipe is installed along the four sides of the fixed plate. A stop valve and a needle valve are installed on the pipeline at one end of the main air supply pipe. The pipeline where the stop valve is located and the pipeline where the needle valve is located are arranged in parallel. An air-operated valve is installed below the center line of the fixed plate. The inlet of the air-operated valve is connected to the main air supply pipe, and the outlet is connected to a control valve. Both ends of the main air supply pipe are connected to the RTV valve front and back; a control air inlet is provided on the main air supply pipe, and a throttle valve is installed at the control air inlet. Each of the two air inlets of the air-operated valve is connected to the main air supply pipe through a copper pipe, and the above two copper pipes are respectively installed at positions close to both ends of the main air supply pipe. The air-operated valve is also additionally installed with three copper pipes. Two of the copper pipes are respectively connected to the RSV valve to control the opening and closing of the RSV valve, and the other copper pipe is used as the air release port of the air-operated valve.

2. The integrated installation structure of valve control elements for a reactor in an SCR system according to claim 1, characterized in that, The main air supply pipe is fixed to the fixed plate by a single-ear pipe clamp.

3. The integrated installation structure of valve control elements for a reactor in an SCR system according to claim 1, characterized in that, The air-operated valve is fixed to the fixed plate by a support.

4. The integrated installation structure of valve control elements for a reactor in an SCR system according to claim 1, characterized in that, A pressure gauge is installed on the air inlet pipeline of the air-operated valve.

5. The integrated installation structure of valve control elements for a reactor in an SCR system according to claim 1, characterized in that, The main air supply pipe is 3 - 5 cm away from the edge of the fixed plate.

6. The integrated installation structure of valve control elements for a reactor in an SCR system according to claim 1, characterized in that, The control air inlet of the main air supply pipe is arranged on the main air supply pipe below the air-operated valve.

7. The integrated installation structure of valve control elements for a reactor in an SCR system according to claim 6, characterized in that, A throttle valve is installed at the control air inlet.

8. The integrated installation structure of valve control elements for a reactor in an SCR system according to claim 7, characterized in that, The stop valve, the needle valve, the air-operated valve, and the throttle valve are all located on the center line of the fixed plate.

9. An installation method for the integrated installation structure of valve control elements for a reactor in an SCR system according to any one of claims 1 - 8, characterized in that, It includes the following steps: (1) Install the needle valve, the stop valve, and the throttle valve on the main air supply pipe, and fix the main air supply pipe to the fixed plate by using a single-ear pipe clamp. (2) Fix the air-operated valve below the center line of the fixed plate by using a support, install the air inlet and outlet pipelines and the air release pipeline of the air-operated valve, and install a pressure gauge on the air inlet pipeline. Then connect the air inlet pipeline to the main air supply pipe by using a reducing tee. (3) Install straight-through pipe joints on the air outlet pipeline of the air-operated valve and the air inlet and outlet pipelines of the main air supply pipe. (4) Check and confirm the integrity of all connection components to complete the integrated installation of the control elements.

10. The installation method for the integrated installation structure of valve control elements for a reactor in an SCR system according to claim 9, characterized in that, During use, both ends of the main air supply pipe are connected to the RTV valve front and back, the control air inlet of the main air supply pipe is connected to an air compressor; the air outlet pipeline of the air-operated valve is connected to the RSV valve.

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