Pre-packaged high-silicon cast iron anode device

Abstract

The invention discloses a pre-packaged high-silicon cast iron anode device which comprises a plurality of pre-packaged anode bodies connected in series, the bottom end of the lowermost pre-packaged anode body is connected with a conical guide head, each pre-packaged anode body comprises a protective sleeve, and a plurality of through holes I are formed in the wall of each protective sleeve. One end of each protective sleeve is connected with a connecting flange, a PVC pipe and a plurality of high-silicon cast iron anode blocks connected in series through cables are arranged in each protective sleeve, a plurality of through holes II are formed in the pipe wall of each PVC pipe, the uppermost high-silicon cast iron anode block is connected with one end of an anode leading-out cable, and the other end of the anode leading-out cable is connected with the other end of the anode leading-out cable. The other end of the anode leading-out cable penetrates into the PVC pipe through the through hole II and penetrates out of the top end of the PVC pipe, and each protective sleeve is filled with filler. According to the anode device, the conductivity of the anode device is improved, the grounding resistance of the anode device is reduced, and the electric energy output is reduced, so that the distribution optimization of a cathode protection system is realized, and the effects of energy conservation and consumption reduction are achieved.

Description

Technical Field

[0001] This invention belongs to the field of cathodic protection technology for buried pipelines, specifically relating to a pre-packaged high-silicon cast iron anode device. Background Technology

[0002] my country's oil and gas resource transportation mainly relies on long-distance pipelines. Since these pipelines are all laid underground, they traverse complex terrains and diverse soil properties, causing varying degrees of corrosion. Currently, pipeline protection primarily relies on a combination of anti-corrosion coatings and cathodic protection, with the effectiveness of cathodic protection playing a decisive role in the pipeline's service life.

[0003] Long-distance pipelines, with their long distances and large diameters, often employ forced current cathodic protection. For areas with high soil resistivity, pre-packaged high-silicon cast iron anodes are used in the anode bed. High-silicon cast iron anodes have good conductivity and can sometimes be directly buried in the soil. Currently, pre-packaged high-silicon cast iron anodes are commonly used, with the anode blocks installed inside carbon steel protective sleeves. During cathodic protection system operation, the surface current of the high-silicon cast iron anode blocks is not easily transferred from the inner surface to the outer surface of the carbon steel protective sleeve, reducing electron transfer and current flow capacity, thereby decreasing the operating efficiency of the anode body. Summary of the Invention

[0004] The purpose of this invention is to provide a pre-packaged high-silicon cast iron anode device that solves the problem of low electron transfer and current flow efficiency in existing anode bodies.

[0005] The technical solution adopted in this invention is a pre-packaged high-silicon cast iron anode device, which includes several pre-packaged anode bodies connected in series, with a conical guide head connected to the bottom end of the lowest pre-packaged anode body.

[0006] The invention is further characterized in that,

[0007] Furthermore, each pre-packaged anode body includes a protective sleeve, each protective sleeve has several through holes I on its wall, one end of each protective sleeve is connected to a connecting flange, each protective sleeve contains a PVC pipe and several high-silicon cast iron anode blocks connected in series by cables, each PVC pipe has several through holes II on its wall, the uppermost high-silicon cast iron anode block is connected to one end of the anode lead cable, the other end of the anode lead cable passes through through hole II into the PVC pipe and out of the top of the PVC pipe, and each protective sleeve is filled with filler.

[0008] The other end of the protective sleeve of the pre-packaged anode body located at the top and middle positions is connected to a connecting flange;

[0009] The other end of the protective sleeve of the pre-packaged anode body located at the bottom is connected to the guide head;

[0010] The end of the anode lead cable located below, away from the high silicon cast iron anode block, passes through the PVC pipe located above it until it exits through the uppermost protective sleeve.

[0011] Furthermore, there are two PVC pipes installed inside the uppermost protective sleeve.

[0012] Furthermore, each protective sleeve includes a cylindrical section, with the bottom of the lowest cylindrical section connected to the guide head, the top of the lowest cylindrical section connected to the larger diameter end of the frustum section, and both ends of the uppermost and middle cylindrical sections connected to the larger diameter end of the frustum section.

[0013] The smaller diameter end of each frustum section is connected to a connecting flange. Baffles are installed at the connection points between the cylindrical section, the frustum section, and the guide head. Each cylindrical section contains a PVC pipe and several high-silicon cast iron anode blocks. Each cylindrical section is filled with filler. The top of each PVC pipe passes through the baffle located above. Several through holes I are provided on the pipe wall of each cylindrical section.

[0014] Furthermore, several through holes I are arranged in a matrix, with 6 through holes I in each row and evenly distributed along the circumference of the protective sleeve, and the distance between two adjacent through holes I in each column is 15cm.

[0015] Furthermore, each protective sleeve is made of high-silicon cast iron.

[0016] Furthermore, the packing material is petroleum coke with a particle size of 5mm to 10mm.

[0017] Furthermore, several through holes II are arranged in a matrix, with 4 through holes II in each row and evenly distributed along the circumference of the PVC pipe, and the distance between two adjacent through holes II in each column is 200mm.

[0018] The beneficial effects of this invention are:

[0019] (1) The pre-packaged high silicon cast iron anode device of the present invention uses high silicon cast iron as the material of the protective sleeve and is provided with through hole I. It utilizes electron transfer and current flow to improve the conductivity of the anode device, reduce the grounding resistance of the anode device, and reduce the power output, thereby achieving the effect of energy saving and consumption reduction by optimizing the distribution of the cathodic protection system.

[0020] (2) The pre-packaged high silicon cast iron anode device of the present invention has high silicon cast iron as the material for the protective sleeve and the anode block, which has higher corrosion resistance than carbon steel, thereby extending the service life of the anode device;

[0021] (3) The pre-packaged high-silicon cast iron anode device of the present invention increases the pipeline protection radius and reduces the replacement frequency of the anode device, thereby saving the maintenance and repair costs of the cathodic protection system.

[0022] (4) The pre-packaged high-silicon cast iron anode device of the present invention greatly shortens the on-site construction time, and completes the operations that were originally carried out on the construction site in the factory, which improves work efficiency and project quality. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the pre-packaged high-silicon cast iron anode device of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the topmost pre-packaged anode body in the pre-packaged high-silicon cast iron anode device of the present invention;

[0025] Figure 3 This is a schematic diagram of the pre-packaged anode body located in the middle position in the pre-packaged high-silicon cast iron anode device of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the pre-packaged anode body located at the bottom in the pre-packaged high-silicon cast iron anode device of the present invention;

[0027] Figure 5 This is a schematic diagram of the cylindrical section after it has been unfolded in the pre-packaged high-silicon cast iron anode device of the present invention.

[0028] In the figure, 1. Protective sleeve, 2. High silicon cast iron anode block, 3. PVC pipe, 4. Filler, 5. Anode lead cable, 6. Connecting flange, 7. Guide head, 8. Through hole I, 9. Through hole II, 10. Cable; 1-1. Cylindrical section, 1-2. Frustum section, 1-3. Baffle. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0030] Example 1

[0031] The pre-packaged high-silicon cast iron anode device of the present invention has the following structure: Figure 1 As shown, it includes several pre-packaged anode bodies connected in series. The bottom end of the pre-packaged anode body located at the bottom is connected to a conical guide head 7, which facilitates the smooth lowering of the anode device and makes installation easier. In this embodiment, there are 5 pre-packaged anode bodies, and two adjacent pre-packaged anode bodies are connected by a connecting flange.

[0032] Example 2

[0033] Based on Example 1, a plurality of pre-packaged anodes connected in series include an uppermost pre-packaged anode, a middle pre-packaged anode, and a lowermost pre-packaged anode. For example, if there are 5 pre-packaged anodes, then there are 3 middle pre-packaged anodes, and 1 each at the top and bottom.

[0034] like Figure 2 As shown, the uppermost pre-packaged anode body includes a protective sleeve 1. The sleeve 1 has several through holes I8 on its wall. Both ends of the sleeve 1 are connected to connecting flanges 6. Inside the sleeve 1, there are two PVC pipes 3 and several high-silicon cast iron anode blocks 2 connected in series by cables 10. The two PVC pipes 3 are parallel to the axis of the sleeve 1. Each PVC pipe 3 has several through holes II9 on its wall. The uppermost high-silicon cast iron anode block 2 is connected to one end of the anode lead cable 8. The other end of the anode lead cable 8 passes through the through hole II9 into the PVC pipe 3 and out of the top of the PVC pipe 3. The sleeve 1 is filled with filler 4.

[0035] like Figure 3 As shown, each pre-packaged anode body located in the middle position includes a protective sleeve 1. The wall of the protective sleeve 1 is provided with several through holes I8. Both ends of the protective sleeve 1 are connected to connecting flanges 6. Inside the protective sleeve 1, there is a PVC pipe 3 and several high silicon cast iron anode blocks 2 connected in series by cables 10. The PVC pipe 3 is arranged parallel to the axis of the protective sleeve 1. The wall of the PVC pipe 3 is provided with several through holes II9. The high silicon cast iron anode block 2 located at the top is connected to one end of the anode lead cable 8. The other end of the anode lead cable 8 passes through the through hole II9 into the PVC pipe 3 and out of the top of the PVC pipe 3. The protective sleeve 1 is filled with filler 4.

[0036] like Figure 4 As shown, the pre-packaged anode body at the bottom includes a protective sleeve 1. The wall of the protective sleeve 1 is provided with several through holes I8. One end of the protective sleeve 1 is connected to a connecting flange 6, and the other end of the protective sleeve 1 is connected to a guide head 7. Inside the protective sleeve 1, there is a PVC pipe 3 and several high silicon cast iron anode blocks 2 connected in series by cables 10. The PVC pipe 3 is arranged parallel to the axis of the protective sleeve 1. The wall of the PVC pipe 3 is provided with several through holes II9. The high silicon cast iron anode block 2 at the top is connected to one end of the anode lead cable 8. The other end of the anode lead cable 8 passes through the through hole II9 into the PVC pipe 3 and out of the top of the PVC pipe 3. The protective sleeve 1 is filled with filler 4.

[0037] The topmost pre-packaged anode, each pre-packaged anode in the middle, and the bottommost pre-packaged anode are all connected by connecting flange 6.

[0038] Each protective sleeve 1 is made of high silicon cast iron, which has good electrical conductivity. It has a diameter of Ф219mm and a length of 6m.

[0039] Setting through-hole I8 facilitates electron transfer and allows for effective utilization of the anode block inside.

[0040] Each high-silicon cast iron anode block 2 is made of high-silicon cast iron, is 1.5m long, has a diameter of Ф75mm, and allows a current density of 5A / m. 2 ~80A / m 2 The consumption rate is less than 0.5 kg / (A·a), the chromium content is 4% to 4.5%, the weight of the anode body is 32 kg / piece, and the interval between adjacent high silicon cast iron anode blocks 2 is 0.5 m.

[0041] Each PVC pipe 3 has a diameter of 60mm and a length of 6m. It is equipped with a through hole II9 to discharge the gas generated by the anode reaction and prevent gas blockage. Each PVC pipe 3 can also be used for cable protection to prevent the anode lead cable 8 from being pulled apart.

[0042] Anode lead cable 8, cable type YJV-0.6kV / 1-25mm 2 The anode lead cable 8 is brazed to the high silicon cast iron anode block 2.

[0043] The packing material is petroleum coke with a particle size of 5mm to 10mm, a carbon content greater than 85%, an ash content less than 10%, a resistivity less than 50Ω·m, good conductivity, good uniformity, reduced anode consumption, reduced gas resistance, and reduced anode surface current density.

[0044] The end of the lower anode lead cable 8, away from the high-silicon cast iron anode block 2, passes sequentially through the PVC pipe 3 above it until it exits through the uppermost protective sleeve 1. That is, each anode lead cable 8 is connected in parallel to the ground anode junction box through the PVC pipe 3. During operation, the anode lead cables 8 do not interfere with each other, and a fault in a single pre-packaged anode body does not affect other pre-packaged anode bodies. Five pre-packaged anode bodies are installed in the active area of ​​the anode well, and the anode grounding resistance is controlled within 1Ω. Specifically, the five pre-packaged anode bodies are numbered 1, 2, 3, 4, and 5 from bottom to top. The anode lead cable 8 of number 1 exits from the top of the PVC pipe 3, enters from the bottom of the PVC pipe 3 of number 2, exits from the top of the PVC pipe 3 of number 2, and so on, passing through numbers 3, 4, and 5. The PVC pipe in section 1 eventually exits through PVC pipe in section 5 and is led out to the ground; the anode cable 8 of section 2 exits from the top of PVC pipe 3 and then enters from the bottom of PVC pipe 3 in section 3, and so on, passing through PVC pipes in sections 4 and 5, and finally exits through PVC pipe in section 5 and is led out to the ground; the anode cable 8 of section 3 exits from the top of PVC pipe 3 and then enters from the bottom of PVC pipe 3 in section 4, then passes through PVC pipe in section 5, and finally exits through PVC pipe in section 5 and is led out to the ground; the anode cable 8 of section 5 exits from the top of its own PVC pipe 3 and is led out to the ground.

[0045] Since there are a large number of anode lead-out cables 8, it is difficult to accommodate all of them in one PVC pipe 3. Therefore, two PVC pipes 3 are set in the pre-packaged anode body at the top, which can divide the multiple anode lead-out cables 8 into two parts for lead-out.

[0046] Example 3

[0047] Based on Example 2, such as Figure 5 As shown, each protective sleeve 1 includes a cylindrical section 1-1. The bottom of the lowest cylindrical section 1-1 is connected to the guide head 7, the top of the lowest cylindrical section 1-1 is connected to the larger diameter end of the frustum section 1-2, and the two ends of the uppermost and middle cylindrical sections 1-1 are connected to the larger diameter end of the frustum section 1-2.

[0048] The smaller diameter end of each frustum section 1-2 is connected to the connecting flange 6. A baffle 1-3 is provided at the connection between the cylindrical section 1-1 and the frustum section 1-2 and the guide head 7. A PVC pipe 3 and several high silicon cast iron anode blocks 2 are provided inside each cylindrical section 1-1. Each cylindrical section 1-1 is filled with filler 4. The top end of each PVC pipe 3 passes through the baffle 1-3 located above. Several through holes I8 are provided on the pipe wall of each cylindrical section 1-1.

[0049] Example 4

[0050] Based on Example 3, a number of through holes I8 are arranged in a matrix, with a hole diameter of 5mm. There are 6 through holes I8 in each row and they are evenly distributed along the circumference of the protective sleeve 1. The distance between two adjacent through holes I8 in each column is 15cm. A number of through holes II9 are arranged in a matrix, with 4 through holes II9 in each row and they are evenly distributed along the circumference of the PVC pipe 3. The distance between two adjacent through holes II9 in each column is 200mm.

[0051] The pre-packaged high-silicon cast iron anode device of this invention is applied to oil and gas field pipelines and regional cathodic protection forced current cathodic protection systems. The working principle of the pre-packaged high-silicon cast iron anode device of this invention is as follows:

[0052] An external power source rectifies AC power into DC power. The positive terminal of the power source is connected to the anode cable. The current flows through the anode cable from the anode junction box and is connected in series with five pre-packaged anode bodies. The current is transferred to the active surface of the pre-packaged anode bodies and undergoes a chemical reaction on the surface of the high-silicon cast iron anode block 2, promoting the transfer of electrons to the coke surface. Coke is a good conductor. Electrons flow through the holes in the outer sheath tube 1 to the soil, and then flow from the soil to the protected structure. After the protected structure absorbs the current, the current returns to the negative terminal of the power source along the cathode line. The protected structure becomes the cathode and is thus protected.

Claims

1. A pre-packaged high-silicon cast iron anode device, characterized in that, It includes several pre-packaged anode bodies connected in series, with a tapered guide head (7) connected to the bottom end of the lowest pre-packaged anode body.

2. The pre-packaged high-silicon cast iron anode device according to claim 1, characterized in that, Each of the pre-packaged anode bodies includes a protective sleeve (1), and each protective sleeve (1) has several through holes I (8) on its wall. One end of each protective sleeve (1) is connected to a connecting flange (6). Each protective sleeve (1) contains a PVC pipe (3) and several high-silicon cast iron anode blocks (2) connected in series by a cable (10). Each PVC pipe (3) has several through holes II (9) on its wall. The uppermost high-silicon cast iron anode block (2) is connected to one end of an anode lead cable (8). The other end of the anode lead cable (8) passes through the through hole II (9) into the PVC pipe (3) and out of the top of the PVC pipe (3). Each protective sleeve (1) is filled with filler (4). The other end of the protective sleeve (1) of the pre-packaged anode body located at the top and middle positions is connected to a connecting flange (6); The other end of the protective sleeve (1) of the pre-packaged anode body located at the bottom is connected to the guide head (7); The end of the anode lead cable (8) located below passes through the PVC pipe (3) located above it in sequence until it exits the protective sleeve (1) located at the top.

3. The pre-packaged high-silicon cast iron anode device according to claim 2, characterized in that, There are two PVC pipes (3) installed inside the uppermost protective sleeve (1).

4. The pre-packaged high-silicon cast iron anode device according to claim 3, characterized in that, Each of the protective sleeves (1) includes a cylindrical section (1-1), the bottom of the lowest cylindrical section (1-1) is connected to the guide head (7), the top of the lowest cylindrical section (1-1) is connected to the larger diameter end of the frustum section (1-2), and both ends of the uppermost and middle cylindrical sections (1-1) are connected to the larger diameter end of the frustum section (1-2). The smaller diameter end of each of the frustum sections (1-2) is connected to the connecting flange (6). A baffle (1-3) is provided at the connection between the cylindrical section (1-1) and the frustum section (1-2) and the guide head (7). A PVC pipe (3) and several high silicon cast iron anode blocks (2) are provided in each of the cylindrical sections (1-1). A filler (4) is provided in each of the cylindrical sections (1-1). The top end of each PVC pipe (3) passes through the baffle (1-3) located above. Several through holes I (8) are provided on the pipe wall of each of the cylindrical sections (1-1).

5. The pre-packaged high-silicon cast iron anode device according to claim 2, characterized in that, The through holes I (8) are arranged in a matrix, with 6 through holes I (8) in each row and evenly distributed along the circumference of the protective sleeve (1). The distance between two adjacent through holes I (8) in each column is 15cm.

6. The pre-packaged high-silicon cast iron anode device according to claim 2, characterized in that, Each of the protective sleeves (1) is made of high silicon cast iron.

7. The pre-packaged high-silicon cast iron anode device according to claim 2, characterized in that, The packing material is petroleum coke with a particle size of 5mm to 10mm.

8. The pre-packaged high-silicon cast iron anode device according to claim 2, characterized in that, The through holes II (9) are arranged in a matrix, with 4 through holes II (9) in each row and evenly distributed along the circumference of the PVC pipe (3). The distance between two adjacent through holes II (9) in each column is 200 mm.

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