A protective structure for corrosion of biogas hydrogen sulfide pipelines

Abstract

This utility model relates to the field of biogas hydrogen sulfide pipeline technology and discloses a protective structure for biogas hydrogen sulfide pipeline corrosion, including a transmission pipeline and a fixing sleeve. A spraying mechanism is fixedly installed on the side of the transmission pipeline, and a flow rate regulating mechanism is fixedly installed on the inner wall of the fixing sleeve. The flow rate regulating mechanism includes a bend, and a connecting block is fixedly installed on the inner wall of the bend. First, the speed of the drive motor is adjusted by the controller, thereby adjusting the flow rate generated when the fan blades rotate. Then, the drive motor is turned on, and the rotation of the drive motor drives the fan blades to rotate, thereby drawing air from outside the bend into the bend. The air is then diverted through the bend and split into eight transmission pipes, and then transmitted through a filter plate to the inside of the transmission pipeline. This adjustment of the flow rate inside the transmission pipeline helps to reduce the corrosiveness of hydrogen sulfide to the transmission pipeline. By controlling the upper limit of the flow rate, erosion corrosion is minimized, thus improving the protection of the transmission pipeline.

Description

Technical Field

[0001] This utility model relates to the field of biogas hydrogen sulfide pipeline technology, specifically a protective structure for corrosion of biogas hydrogen sulfide pipelines. Background Technology

[0002] Hydrogen sulfide (H2S) is a colorless, highly toxic acidic gas. It is the simplest of the sulfur hydrides, belonging to inorganic compounds. At high concentrations, it has no obvious odor; at low concentrations, it has a strong rotten egg smell; and at extremely low concentrations, it has a sulfurous odor. H2S is highly soluble in water, and its aqueous solution is weakly acidic. For example, at 1 atmosphere and 30°C, the saturated concentration of H2S in an aqueous solution is approximately 300 mg / L, and the pH of the solution is approximately 4. H2S not only poses a significant threat to human health and safety but also exhibits strong corrosiveness to steel, posing a considerable potential danger to the safe operation of equipment in the petroleum and petrochemical industries.

[0003] Hydrogen sulfide is usually transported through pipelines, but after prolonged use, the inner walls of the pipelines will rust due to the corrosive properties of hydrogen sulfide, damaging the pipelines and affecting their service life.

[0004] Therefore, a protective structure is needed for biogas hydrogen sulfide pipeline corrosion. Utility Model Content

[0005] The purpose of this utility model is to provide a protective structure for biogas hydrogen sulfide pipeline corrosion, so as to solve the problem mentioned in the background art that after long-term use, the inner wall of the pipeline will rust due to the corrosive properties of hydrogen sulfide, which will damage the pipeline and affect its service life.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a protective structure for corrosion of biogas hydrogen sulfide pipelines, comprising a transmission pipeline and a fixing sleeve. A spraying mechanism is fixedly installed on the side of the transmission pipeline, and a flow rate regulating mechanism is fixedly installed on the inner wall of the fixing sleeve. The flow rate regulating mechanism includes a bend, a connecting block is fixedly installed on the inner wall of the bend, a drive motor is fixedly installed on the inner wall of the connecting block, and a fan blade is fixedly installed on the end face of the drive motor transmission rod. The number of fan blades is nine. A diversion pipe is fixedly installed on the end face of the bend, a transmission pipe is fixedly installed on the end face of the diversion pipe, a sleeve is fitted on the side of the transmission pipe, a filter plate is fixedly installed on the end face of the sleeve, a fixing frame is fixedly installed on the side of the transmission pipe, the diversion pipe branches into eight pipes, the distance between two pipes is 45 degrees, and a grid plate is fixedly installed on the inner wall of the end face of the bend.

[0007] Preferably, the spraying mechanism includes a fixed plate, the bottom end of which is fixedly connected to the side of the transmission pipe, a pump is fixedly installed on the side of the fixed plate, and a water tank is fixedly installed on the fixed end of the pump.

[0008] Preferably, the water tank has a through hole fixedly opened on the fixed end face, and a water inlet is fixedly installed on the inner wall of the through hole. The pump has an output pipe fixedly installed on the fixed end face, and an atomizer is fixedly installed inside the output pipe.

[0009] Preferably, the inner wall of the transmission pipeline is fixedly equipped with an anti-corrosion coating, and the bends all penetrate the transmission pipeline and the side of the anti-corrosion coating and extend into the transmission pipeline and the anti-corrosion pipe.

[0010] Preferably, the output pipe passes through the side of the bend and extends into the interior of the bend.

[0011] Preferably, a fixing block is fixedly installed on the side of the transmission pipe, and a fixing sleeve is fixedly installed on the fixed end face of the fixing block, with the inner wall of the fixing sleeve being fixedly connected to the side of the bend.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1) This protective structure for biogas hydrogen sulfide pipeline corrosion first adjusts the speed of the drive motor through the controller, thereby adjusting the flow rate generated when the fan blades rotate. Then, the drive motor is turned on, and the rotation of the drive motor drives the fan blades to rotate, thereby drawing air from outside the bend into the bend. The air then flows through the bend and through the diversion pipe into eight transmission pipes. After passing through the filter plate, the air is transmitted into the transmission pipeline. The flow rate inside the transmission pipeline is then regulated, which helps to reduce the corrosiveness of hydrogen sulfide to the transmission pipeline. By controlling the upper limit of the flow rate, the erosion corrosion is minimized, thus improving the protection of the transmission pipeline.

[0014] 2) This protective structure for biogas hydrogen sulfide pipeline corrosion is used by first adding the corrosion inhibitor into the water tank through the water inlet, then turning on the pump. The pump pumps the corrosion inhibitor in the water tank to the output pipe, where it is atomized and sprayed out, then falls into the bend. Along with the flow rate adjustment mechanism, the corrosion inhibitor is added into the transmission pipeline. The sprayed corrosion inhibitor is usually an oxygen-containing organic corrosion inhibitor (film-forming corrosion inhibitor), including amines, mirtazoles, amides, and quaternary ammonium salts, as well as sulfur and phosphorus-containing compounds. Therefore, it can effectively improve the corrosion resistance of the transmission pipeline and greatly extend the service life of the pipeline. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of a protective structure for biogas hydrogen sulfide pipeline corrosion in an embodiment of this utility model.

[0016] Figure 2 This is a schematic diagram of the flow rate adjustment mechanism in an embodiment of the present invention;

[0017] Figure 3This is a schematic diagram of the spraying mechanism in an embodiment of the present invention;

[0018] Figure 4 This is a schematic diagram of the diversion tube structure in an embodiment of this utility model;

[0019] Figure 5 This is a schematic diagram of a partial cross-sectional structure of the bent pipe in an embodiment of this utility model.

[0020] In the diagram: 1. Transmission pipe; 2. Anti-corrosion coating; 3. Fixing block; 4. Fixing sleeve; 5. Flow rate adjustment mechanism; 501. Bend; 502. Connecting block; 503. Drive motor; 504. Fan blade; 505. Grid plate; 506. Diverter pipe; 507. Transmission pipe; 508. Fixing frame; 509. Sleeve; 510. Filter plate; 6. Spraying mechanism; 601. Fixing plate; 602. Pump; 603. Water tank; 604. Water inlet; 605. Output pipe. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example 1

[0023] Combination Figures 1-5 A protective structure for corrosion of biogas hydrogen sulfide pipelines includes a transmission pipeline 1 and a fixing sleeve 4. A spraying mechanism 6 is fixedly installed on the side of the transmission pipeline 1, and a flow rate regulating mechanism 5 is fixedly installed on the inner wall of the fixing sleeve 4. The flow rate regulating mechanism 5 includes a bend 501, a connecting block 502 is fixedly installed on the inner wall of the bend 501, a drive motor 503 is fixedly installed on the inner wall of the connecting block 502, a fan blade 504 is fixedly installed on the end face of the transmission rod of the drive motor 503, and there are nine fan blades. A diversion pipe 506 is fixedly installed on the end face of the bend 501, a transmission pipe 507 is fixedly installed on the end face of the diversion pipe 506, a sleeve 509 is sleeved on the side of the transmission pipe 507, a filter plate 510 is fixedly installed on the end face of the sleeve 509, a fixing frame 508 is fixedly installed on the side of the transmission pipe 507, eight pipes are branched from the diversion pipe 506, the distance between two pipes is 45 degrees, and a grid plate 505 is fixedly installed on the inner wall of the end face of the bend 501.

[0024] Specifically, at a certain flow rate, the corrosion rate of carbon steel and low-alloy steel in H2S-containing fluids typically decreases gradually over time, reaching a very low equilibrium corrosion rate. However, if the fluid velocity is high or in a turbulent state, the iron sulfide corrosion product film on the steel surface is damaged or poorly adhered due to fluid scouring. The steel will continue to corrode at its initial high velocity, quickly damaging equipment, pipelines, and components. Therefore, it is necessary to control the upper limit of the flow velocity to minimize scouring corrosion. Typically, the gas flow velocity of valves is specified to be below 1 liter. At a speed of 5 m / s, the speed of the drive motor 503 is first adjusted by the controller, which in turn adjusts the flow rate generated when the fan blade 504 rotates. Then, the drive motor 503 is turned on, and the rotation of the drive motor 503 drives the fan blade 504 to rotate, thereby drawing the outside air into the bend 501. The air then passes through the bend 501 and the diversion pipe 506 to be divided into eight transmission pipes 507. The air then passes through the filter plate 510 and is transmitted to the transmission pipeline 1. This process adjusts the flow rate inside the transmission pipeline 1, which helps to reduce the corrosiveness of hydrogen sulfide to the transmission pipeline 1.

[0025] Example 2

[0026] See Figures 1-5 Furthermore, the spraying mechanism 6 includes a fixed plate 601, the bottom end of which is fixedly connected to the side of the transmission pipe 1. A pump 602 is fixedly installed on the side of the fixed plate 601. A water tank 603 is fixedly installed on the fixed end of the pump 602. A through hole is fixedly opened on the fixed end of the water tank 603. A water inlet 604 is fixedly installed on the inner wall of the through hole. An output pipe 605 is fixedly installed on the fixed end of the pump 602. An atomizer is fixedly installed inside the output pipe 605. An anti-corrosion coating 2 is fixedly installed on the inner wall of the transmission pipe 1. The bends 501 penetrate the transmission pipe 1 and the side of the anti-corrosion coating 2 and extend into the transmission pipe 1 and the anti-corrosion pipe 2. The output pipe 605 penetrates the side of the bend 501 and extends into the bend 501. A fixed block 3 is fixedly installed on the side of the transmission pipe 1. A fixed sleeve 4 is fixedly installed on the fixed end of the fixed block 3. The inner wall of the fixed sleeve 4 is fixedly connected to the side of the bend 501.

[0027] Specifically, practice has proven that the appropriate addition of corrosion inhibitors is an effective method to prevent corrosion of carbon steel and low alloy steel facilities by acidic oil and gas containing H2S. Corrosion inhibitors used in acidic environments containing H2S are usually oxygen-containing organic corrosion inhibitors (film-forming corrosion inhibitors), including amines, mirtazoles, amides, and quaternary ammonium salts, as well as compounds containing sulfur and phosphorus. Therefore, in use, the corrosion inhibitor is first added to the water tank 603 through the water inlet 604, and then the pump 602 is turned on. The pump 602 pumps the corrosion inhibitor in the water tank 603 to the output pipe 605, where it is atomized and sprayed out, and then falls into the curved pipe 501. Along with the flow rate adjustment mechanism 5, the corrosion inhibitor is added to the transmission pipeline 1, improving the corrosion resistance of the transmission pipeline 1.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A protection structure for preventing corrosion of a biogas hydrogen sulfide pipeline, comprising a transmission pipeline (1) and a fixing sleeve (4), characterized in that: A spraying mechanism (6) is fixedly installed on the side of the transmission pipe (1), and a flow rate regulating mechanism (5) is fixedly installed on the inner wall of the fixed sleeve (4). The flow rate regulating mechanism (5) includes a bend (501), a connecting block (502) is fixedly installed on the inner wall of the bend (501), a drive motor (503) is fixedly installed on the inner wall of the connecting block (502), a fan blade (504) is fixedly installed on the end face of the drive rod of the drive motor (503), the number of fan blades (504) is nine, a diversion pipe (506) is fixedly installed on the end face of the bend (501), a transmission pipe (507) is fixedly installed on the end face of the diversion pipe (506), a sleeve (509) is sleeved on the side of the transmission pipe (507), a filter plate (510) is fixedly installed on the end face of the sleeve (509), a fixing frame (508) is fixedly installed on the side of the transmission pipe (507), the diversion pipe (506) branches into eight pipes, the distance between two pipes is forty-five degrees, and a grid plate (505) is fixedly installed on the inner wall of the end face of the bend (501).

2. A protection structure for the corrosion of biogas H2S pipelines according to claim 1, characterized in that: The spraying mechanism (6) includes a fixing plate (601), the bottom end of the fixing plate (601) is fixedly connected to the side of the transmission pipe (1), a pump (602) is fixedly installed on the side of the fixing plate (601), and a water tank (603) is fixedly installed on the top end of the pump (602).

3. The protective structure for corrosion of biogas hydrogen sulfide pipelines according to claim 2, characterized in that: The top surface of the water tank (603) is fixedly provided with a through hole, and a water inlet (604) is fixedly installed on the inner wall of the through hole. The top surface of the pump (602) is fixedly provided with an output pipe (605), and an atomizer is fixedly installed inside the output pipe (605).

4. A protection structure for preventing corrosion of a biogas H2S pipeline according to claim 1, characterized in that: The inner wall of the transmission pipeline (1) is fixedly installed with an anti-corrosion coating (2), and the bends (501) all penetrate the side of the transmission pipeline (1) and the anti-corrosion coating (2) and extend into the interior of the transmission pipeline (1) and the anti-corrosion coating (2).

5. A protective structure for the corrosion of biogas H2S pipelines according to claim 3, characterized in that: The output tube (605) passes through the side of the bend (501) and extends into the interior of the bend (501).

6. A protective structure for the corrosion of biogas H2S pipelines according to claim 1, characterized in that: A fixing block (3) is fixedly installed on the side of the transmission pipe (1), and a fixing sleeve (4) is fixedly installed on the top surface of the fixing block (3). The inner wall of the fixing sleeve (4) is fixedly connected to the side of the bend (501).

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