Biogas pressure stabilizing tank and method

Abstract

The application discloses a biogas pressure stabilizing tank, which comprises a base, an inner gas tank membrane arranged on the base, an outer gas tank membrane arranged outside the inner gas tank membrane, a pressure regulating device arranged on one side of the outer gas tank membrane, a fan connected with the outer gas tank membrane through a blowing pipeline, a first pressure monitor arranged at the joint of the blowing pipeline and the outer gas tank membrane, an air inlet pipe and a gas conveying pipe arranged at the bottom of the base and communicated with the inner gas tank membrane; the application has the advantages of simple structure, novel design, no manual operation, close connection between the pressure relief device and the pressure regulating cavity, good sealing performance, automatic opening and closing of the pressure relief device, effective pressure relief, internal pressure increase through the opening of the fan, greatly improved pressure regulating effect and internal pressure stability.

Description

Technical Field

[0001] The invention relates to the field of biogas treatment technology, specifically to a biogas pressure stabilizing cabinet and pressure stabilization method. Background Technology

[0002] The biogas produced during the anaerobic treatment of wastewater is mainly composed of methane, with a methane concentration of about 50%-70%. In order to reduce the environmental pollution caused by biogas combustion and to maximize the efficiency of resource utilization, the biogas produced by multiple anaerobic towers in the wastewater treatment plant first enters the biogas pressure stabilizing cabinet, and then enters the desulfurization system through self-pressurization to remove hydrogen sulfide. After desulfurization, the biogas is used to generate electricity, and some of the remaining biogas is directly burned through a flare.

[0003] After the desulfurization system has been running for a period of time, the gas resistance of the desulfurization tower will change, which may cause the local resistance of the biogas pipeline to be too large or too small. At this time, the biogas in the biogas pressure stabilizing cabinet will not flow smoothly, and it is necessary to depressurize or pressurize it.

[0004] Existing biogas pressure regulators are unstable during pressure relief, and the sealing performance at the pressure relief point is poor, resulting in some gas leakage. Furthermore, the entire device has poor operational precision and low automation, which greatly reduces the pressure regulation effect. Summary of the Invention

[0005] The purpose of this invention is to provide a biogas pressure stabilizing cabinet and a pressure stabilizing method to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the invention provides the following technical solution: a biogas pressure stabilizing unit, comprising a base, an inner gas holder membrane on the base, an outer gas holder membrane on the outside of the inner gas holder membrane, a pressure regulating device above the outer gas holder membrane, a blower connected to one side of the outer gas holder membrane via an air supply pipe, a first pressure monitor at the junction of the air supply pipe and the outer gas holder membrane, and an air inlet pipe and an air delivery pipe at the bottom of the base, the air inlet pipe and the air delivery pipe communicating with the inner gas holder membrane.

[0007] Preferably, the pressure regulating device includes a pressure regulating chamber that communicates with the outer mold of the gas holder, and a second pressure monitor is provided at the upper end of the pressure regulating chamber; the upper end of the pressure regulating chamber is also provided with a pressure relief port, the inner wall of the pressure relief port is provided with threads, and the pressure relief port is provided with a pressure relief device.

[0008] The pressure relief device includes an air outlet plate disposed inside the pressure relief port, and the diameter of the air outlet plate is larger than the diameter of the pressure relief port. The air outlet plate is provided with four arc-shaped connecting plates, each with a gap between it, and they are combined to form a circle. The outer walls of each of the four arc-shaped connecting plates are provided with threads.

[0009] The upper ends of the four arc-shaped connecting plates are connected to a pneumatic rotary connecting assembly.

[0010] The pneumatic rotary connection assembly includes a first connecting block with a placement groove in the middle. A pressure inlet and a pressure outlet are respectively located on both sides of the placement groove. The first connecting block has two through holes on each side of the placement groove. The pressure inlet and outlet communicate with the through holes on both sides. Movable plugs are installed in each of the through holes on both sides. A pneumatic rotary device is installed inside the placement groove.

[0011] The upper outer wall of the first connecting block is provided with a first locking groove, and an electric telescopic rod is provided in the middle of the upper end of the first connecting block. The electric telescopic rod is provided with a second connecting block.

[0012] The second connecting block has a second snap-fit ​​groove on its lower edge and two grooves on its lower surface. The positions of the two grooves correspond to the positions of the two through holes. Each groove contains a magnetic block. The interior of the second connecting block contains an electromagnetic induction coil.

[0013] Preferably, the pneumatic rotating device includes a housing, a rotating connecting rod is provided inside the housing, a plurality of rotating fan blades are provided on the rotating connecting rod, an air inlet and an air outlet are respectively provided on both sides of the housing, the air inlet is connected to an air pressure inlet, the air outlet is connected to an air pressure outlet, the rotating connecting rod passes through the entire housing, and the two ends of the rotating connecting rod are respectively fixed to the upper and lower sides of the placement groove.

[0014] Preferably, the vent plate is provided with multiple vent holes.

[0015] Preferably, the first pressure monitor receives a low-pressure feedback signal. When the gas volume in the inner membrane of the gas holder decreases, the first pressure monitor will send a signal feedback. At this time, the fan that receives the signal will start to operate and blow gas into the space between the inner and outer membranes to maintain the pressure of the gas in the inner membrane of the gas holder.

[0016] The second pressure monitor receives a feedback high-pressure signal. When the gas volume increases, the inner membrane of the gas holder will continuously expand. The second pressure monitor will then provide a signal feedback. At this time, the pressure regulating device that receives the signal feedback will release the gas, thereby venting unnecessary gas from the outer membrane of the gas holder and keeping the gas pressure of the inner membrane of the gas holder stable within a fixed pressure range from beginning to end.

[0017] Compared with the prior art, the beneficial effects of the invention are: the invention has a simple structure and novel design, requires no manual operation, and has a tight connection between the pressure relief device and the pressure regulating chamber, resulting in good sealing performance; the pressure relief device can be effectively relieved by automatically adjusting its opening and closing; and the internal pressure can be effectively increased by turning on the fan, greatly improving the pressure regulation effect and thus ensuring the stability of the internal air pressure. Attached Figure Description

[0018] Figure 1 A cross-sectional view of the overall structure of the invention;

[0019] Figure 2 A cross-sectional view of the pressure regulating cavity of the invention;

[0020] Figure 3 A cross-sectional view of the structure of the pressure relief device for the invention;

[0021] Figure 4 A cross-sectional schematic diagram of the structure of the pneumatic rotating device for the invention;

[0022] Figure 5 This is a top view schematic diagram of the structure of the gas vent plate for the invention. Detailed Implementation

[0023] The technical solutions of the embodiments of the invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the invention.

[0024] Please see Figure 1 The invention provides a technical solution: a biogas pressure stabilizing cabinet, including a base 1, an inner gas holder membrane 2 on the base 1, an outer gas holder membrane 3 on the outside of the inner gas holder membrane 2, a pressure regulating chamber 4 on one side of the outer gas holder membrane 3, and a second pressure monitor 41 at the upper end of the pressure regulating chamber 4, which receives feedback high pressure signals and sends them to a pressure relief device 5 on the pressure regulating chamber 4, thereby releasing the gas pressure between the inner and outer membranes through the pressure relief device 5 to maintain the pressure of the gas in the inner gas holder membrane;

[0025] The other side of the outer membrane 3 of the gas holder is connected to the blower 8 through the air supply pipe 81. A first pressure monitor 82 is provided at the junction of the air supply pipe 81 and the outer membrane 3 of the gas holder. It receives a low pressure signal and sends it to the blower. After the blower is turned on, it blows gas into the middle of the inner and outer membranes to maintain the pressure of the gas in the inner membrane of the gas holder.

[0026] The base 1 is provided with an air inlet pipe 11 and an air delivery pipe 12 at its bottom. The air inlet pipe 11 and the air delivery pipe 12 are connected to the inner membrane 2 of the gas holder. Biogas is delivered to or output to the biogas pressure stabilizing cabinet through the air inlet pipe and the air delivery pipe, respectively.

[0027] In this embodiment, the pressure regulating chamber 4 is connected to the outer mold 3 of the gas holder. A second pressure monitor 41 is provided at the upper end of the pressure regulating chamber 4, which is connected to the main controller through a signal line for real-time monitoring of the gas pressure value inside the pressure regulating chamber. A pressure relief port 42 is also provided at the upper end of the pressure regulating chamber 4. The inner wall of the pressure relief port 42 is threaded, and a pressure relief device 5 is provided on the pressure relief port 42. The pressure relief device is used to seal the pressure relief port and control the pressure relief port to close or open according to the real-time monitored gas pressure value.

[0028] The pressure relief device 5 includes an air outlet plate 51, which is disposed inside the pressure relief port 42 and has a diameter larger than that of the pressure relief port 42. The air outlet plate 51 is provided with four arc-shaped connecting plates 52, with gaps between the four arc-shaped connecting plates 52. When combined, they form a circle, allowing the air pressure to be released to be dissipated through the gaps. The outer walls of the four arc-shaped connecting plates 52 are provided with threads, which match the threads on the inner wall of the pressure relief port 42, thereby achieving the purpose of tightening or loosening.

[0029] The upper ends of the four arc-shaped connecting plates 52 are connected to a pneumatic rotary connecting assembly 6, which is used to drive the entire pressure relief device to rotate in the opposite direction, thereby automatically loosening the pressure relief device by rotating it, so as to detach it from the pressure relief port and facilitate pressure relief and exhaust.

[0030] The pneumatic rotary connection assembly 6 includes a first connecting block 61. The first connecting block 61 has a placement groove 62 in the middle. The placement groove 62 has a pressure inlet 63 and a pressure outlet 64 on both sides. The first connecting block 61 has two through holes 65, which are respectively located on both sides of the placement groove 62. The pressure inlet 63 and the pressure outlet 64 communicate with the through holes 65 on both sides. Each of the through holes 65 on both sides has an iron movable plug 66. A pneumatic rotary device 7 is installed in the placement groove 62. In the above embodiment, by moving the piston rod away from the pressure inlet 63 and the pressure outlet 64, the pressure in the pressure regulating chamber can enter the first connecting block and then enter the pneumatic rotary device, which can drive the pneumatic rotary connection assembly to rotate in the opposite direction, thereby driving the arc-shaped connecting plate to move up and opening the pressure relief port 42.

[0031] The upper outer wall of the first connecting block 61 is provided with a first locking groove 611. The upper end of the first connecting block 61 is provided with a second connecting block 68. An electric telescopic rod 67 is provided between the second connecting block 68 and the first connecting block 61. The distance between the first connecting block and the second connecting block can be adjusted by extending and retracting the electric telescopic rod. When the distance between the first connecting block and the second connecting block increases, a second locking groove 681 is provided on the lower edge of the second connecting block 68, which will be locked and fixed with the first locking groove 611.

[0032] The lower surface of the second connecting block 68 is provided with two grooves 682, the positions of which correspond to the positions of the two through holes 65. Each groove 682 is provided with a magnetic block. When the second connecting block is close to the first connecting block, it can attract the piston rod into the groove, thereby moving the piston rod away from the air pressure inlet and outlet. Similarly, when the second connecting block is away from the first connecting block, the piston rod falls down and blocks the air pressure inlet and outlet. The interior of the second connecting block 68 is provided with an electromagnetic induction coil 683. The electromagnetic induction coil is connected to the main controller through a signal line. When energized, the electromagnetic induction coil generates a magnetic field, which can drive the second connecting block to rotate in the forward direction. The second connecting block drives the first connecting block to rotate, thereby making the entire pressure relief device rotate in the forward direction, so that it is tightened and sealed with the pressure relief port.

[0033] In the above embodiment, when the air pressure inside the pressure regulating chamber is too high, the second pressure monitor feeds back the monitored signal to the main controller. The main controller has a pre-edited control instruction program. At this time, the main controller gives an instruction to start the electric telescopic rod to descend, so that the second connecting block is close to the first connecting block. At this time, the piston rod will automatically move up and be attracted to the groove of the second connecting block due to the attraction of the magnetic block. This allows the air pressure inlet and air pressure outlet to open, so that the air pressure in the pressure regulating chamber enters the pneumatic rotary connecting assembly and drives the pressure relief device to rotate in the opposite direction. During the rotation, the pressure relief device is loosened from the pressure relief port to release pressure.

[0034] After the pressure relief is completed, the internal pressure becomes constant. At this time, the second pressure monitor feeds back the monitored pressure signal to the main controller. The main controller then issues a command to start the electric telescopic rod to rise, moving the second connecting block away from the first connecting block. This causes the piston rod to stop engaging with the groove of the second connecting block. The piston rod slowly returns to its original position, blocking the air pressure inlet and outlet. This stops the pneumatic rotary connecting assembly from rotating. Then, the electromagnetic induction coil is activated, driving the pressure relief device to rotate in the forward direction. This causes the pressure relief device to tighten during rotation and seal with the pressure relief port.

[0035] In this embodiment, the pneumatic rotating device 7 includes a housing 71, within which a rotating connecting rod 72 is provided. The rotating connecting rod 72 is equipped with multiple rotating fan blades 73, which drive the rotating connecting rod to rotate. The housing 71 has an air inlet 74 and an air outlet 75 on its two sides, respectively. The air inlet 74 is connected to a pressure inlet 63, and the air outlet 75 is connected to a pressure outlet 64. When pressure relief is required, a portion of the pressure inside the pressure regulating chamber enters the housing of the pneumatic rotating device through the air inlet. Because a one-way valve is provided in the air outlet, this one-way valve prevents high-pressure gas from reversing and entering the housing from the pressure outlet. This one-way valve only... The airflow entering from the air inlet can be blown outward, thus ensuring that the gas entering the housing of the pneumatic rotating device is discharged unidirectionally from the air outlet. The airflow formed by the air pressure flow drives the rotating fan blades to rotate, thereby causing the rotating connecting rod to rotate as well. This achieves the purpose of effectively utilizing the excess air pressure inside the pressure regulating chamber. Furthermore, since the rotating connecting rod 72 passes through the entire housing 71, and the two ends of the rotating connecting rod 72 are respectively fixed to the upper and lower sides of the placement groove 62, through the above connection structure, the rotating connecting rod can drive the entire first connecting block to rotate, and the first connecting block can drive the second connecting block to rotate, thereby achieving the purpose of unscrewing the pressure relief device to release air.

[0036] In this embodiment, the air outlet plate 51 is provided with a plurality of air outlet holes 53, which enables the air outlet plate to better disperse air.

[0037] A pressure stabilization method for a biogas pressure stabilizing unit: The first pressure monitor only feeds back a low pressure signal. When the gas volume in the inner membrane of the gas holder decreases, the first pressure monitor will feed back a signal. At this time, the blower that receives the signal will start running and blow gas into the space between the inner and outer membranes to maintain the pressure of the gas in the inner membrane of the gas holder.

[0038] The second pressure monitor only feeds back a high-pressure signal. When the gas volume increases, the inner membrane of the gas holder will continuously expand, and the second pressure monitor will provide a signal feedback. At this time, the pressure regulating device that receives the signal feedback will release the gas, thereby venting unnecessary gas from the outer membrane of the gas holder and keeping the gas pressure of the inner membrane of the gas holder stable within a fixed pressure range from beginning to end.

[0039] Although embodiments of the 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 these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A biogas pressure stabilizing unit, comprising a base (1), wherein an inner gas holder membrane (2) is provided on the base (1), and an outer gas holder membrane (3) is provided on the outside of the inner gas holder membrane (2), characterized in that: A pressure regulating device is provided above the outer membrane (3) of the gas holder. A blower (8) is connected to one side of the outer membrane (3) of the gas holder through an air supply pipe (81). A first pressure monitor (82) is provided at the junction of the air supply pipe (81) and the outer membrane (3) of the gas holder. An air inlet pipe (11) and an air delivery pipe (12) are provided at the bottom of the base (1). The air inlet pipe (11) and the air delivery pipe (12) are connected to the inner membrane (2) of the gas holder. The pressure regulating device includes a pressure regulating chamber (4), which is connected to the outer mold (3) of the gas holder. A second pressure monitor (41) is provided at the upper end of the pressure regulating chamber (4). A pressure relief port (42) is also provided at the upper end of the pressure regulating chamber (4). The inner wall of the pressure relief port (42) is threaded, and a pressure relief device (5) is provided on the pressure relief port (42). The pressure relief device (5) includes an air outlet plate (51), which is located inside the pressure relief port (42) and has a diameter larger than that of the pressure relief port (42). The air outlet plate (51) is provided with four arc-shaped connecting plates (52), with gaps between the four arc-shaped connecting plates (52), and they are combined to form a circle. The outer walls of the four arc-shaped connecting plates (52) are provided with threads. The upper ends of the four arc-shaped connecting plates (52) are connected to a pneumatic rotary connecting assembly (6). The pneumatic rotary connection assembly (6) includes a first connecting block (61). A placement groove (62) is provided in the middle of the first connecting block (61). A pressure inlet (63) and a pressure outlet (64) are respectively provided on both sides of the placement groove (62). Two through holes (65) are provided on the first connecting block (61), respectively located on both sides of the placement groove (62). The pressure inlet (63) and pressure outlet (64) communicate with the through holes (65) on both sides. Movable plugs (66) are provided in both through holes (65). A pneumatic rotary connection assembly is installed in the placement groove (62). Rotating device (7), the pneumatic rotating device (7) includes a housing (71), a rotating connecting rod (72) is provided inside the housing (71), a plurality of rotating fan blades (73) are provided on the rotating connecting rod (72), an air inlet (74) and an air outlet (75) are respectively provided on both sides of the housing (71), the air inlet (74) is connected to the air pressure inlet (63), the air outlet (75) is connected to the air pressure outlet (64), the rotating connecting rod (72) runs through the entire housing (71), and the two ends of the rotating connecting rod (72) are respectively fixed to the upper and lower sides of the placement groove (62); The upper outer wall of the first connecting block (61) is provided with a first snap-fit ​​groove (611), the upper end of the first connecting block (61) is provided with a second connecting block (68), and an electric telescopic rod (67) is provided between the second connecting block (68) and the first connecting block (61). The second connecting block (68) has a second snap-fit ​​groove (681) on its lower edge and two grooves (682) on its lower surface. The positions of the two grooves (682) correspond to the positions of the two through holes (65). Each groove (682) is provided with a magnetic block. The interior of the second connecting block (68) is provided with an electromagnetic induction coil (683).

2. The biogas pressure stabilizing unit according to claim 1, characterized in that: The air outlet plate (51) is provided with multiple air outlet holes (53).

3. The pressure stabilization method for a biogas pressure stabilizing cabinet according to claim 1, characterized in that: The first pressure monitor only feeds back a low pressure signal. When the gas volume in the inner membrane of the gas holder decreases, the first pressure monitor will send a signal feedback. At this time, the blower that receives the signal will start to operate and blow gas into the space between the inner and outer membranes to maintain the pressure of the gas in the inner membrane of the gas holder. The second pressure monitor only feeds back a high-pressure signal. When the gas volume increases, the inner membrane of the gas holder will continuously expand, and the second pressure monitor will provide a signal feedback. At this time, the pressure regulating device that receives the signal feedback will release the gas, thereby venting unnecessary gas from the outer membrane of the gas holder and keeping the gas pressure of the inner membrane of the gas holder stable within a fixed pressure range from beginning to end.

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