Self-adaptive collection system for condensed water of biogas pipeline

Abstract

The utility model provides a biogas pipeline condensed water self-adaptive collection system which comprises a fermentation tank, a liquid level meter, a coarse biogas pipeline, a condensed water drainage pipeline and a liquid level interlocking control system, the coarse biogas pipeline and the condensed water drainage pipeline are both arranged in the fermentation tank and located below frozen soil, one end of each of the coarse biogas pipeline and the condensed water drainage pipeline penetrates out of the fermentation tank, the coarse biogas pipeline is symmetrically arranged along the central axis of the fermentation tank and is lower than the condensed water drainage pipeline, a variable-frequency submersible pump is arranged at the bottom end of the condensed water drainage pipeline, and the coarse biogas pipeline has a gradient; and the variable-frequency submersible pump is in electric signal connection with the liquid level interlocking control system and is started and stopped by receiving an instruction of the liquid level interlocking control system. The self-adaptive collection system integrates multiple functions of biogas dehydration, self-adaptive safe collection, delivery, accurate control and the like, and is suitable for various biogas pipeline coarse dehydration application scenes of large-scale biogas projects.

Description

Technical Field

[0001] This utility model belongs to the field of biogas engineering technology, specifically relating to an adaptive collection system for condensate from biogas pipelines. Background Technology

[0002] Biomass biogas, through biological methods, directly treats organic waste, improving the living environment and producing clean energy and primary resources, making it an important component of developing a circular economy. Currently, my country's biomass energy industry is developing rapidly, with several small-scale demonstration projects in the energy and resource sectors. However, large-scale industrial-scale integrated recycling projects for biomass resources still lack practical experience.

[0003] In China, most biogas pipelines for anaerobic digesters in biogas projects are laid out in above-ground pipe corridors, requiring a slope along the biogas flow direction and an insulation layer on the outside of the steel pipes. For large-scale biogas projects, the above-ground space is crisscrossed, and the high surface temperature of the pipelines in summer is not conducive to the condensation of moisture in the biogas, increasing the dehydration load of downstream sections, occupying a lot of maintenance and operation space, and is also unsightly. Utility Model Content

[0004] The purpose of this invention is to provide an adaptive collection system for condensate from biogas pipelines, overcoming the aforementioned technical problems in the prior art.

[0005] Therefore, the technical solution provided by this utility model is as follows:

[0006] An adaptive collection system for condensate from a biogas pipeline includes a fermenter, a level gauge, a coarse biogas pipeline, a condensate drainage pipeline, and a level interlock control system. The fermenter is located underground. Both the coarse biogas pipeline and the condensate drainage pipeline are located inside the fermenter and below frozen soil, with one end extending out of the fermenter. The coarse biogas pipeline is symmetrically arranged along the central axis of the fermenter and is lower than the condensate drainage pipeline. A variable frequency submersible pump is installed at the bottom of the condensate drainage pipeline. The coarse biogas pipeline has a slope. The variable frequency submersible pump is electrically connected to the level interlock control system and starts and stops upon receiving commands from the level interlock control system.

[0007] The liquid level interlocking control system includes a PLC controller, and the liquid level gauge is an ultrasonic liquid level gauge installed at the top of the fermentation tank. Both the variable frequency submersible pump and the ultrasonic liquid level gauge are electrically connected to the PLC controller.

[0008] The fermenter is equipped with a protective device on top, which includes a safety lock and a pressure balancing device.

[0009] The slope of the crude biogas pipeline is 1-5‰.

[0010] The PLC controller is set with high-high alarm liquid level LZA+, high alarm liquid level LA+, normal operation high liquid level LZ+, normal operation low liquid level LZ-, and low-low alarm liquid level LZA-.

[0011] The coarse biogas pipeline is a flexible waterproof sleeve.

[0012] The beneficial effects of this utility model are:

[0013] The biogas pipeline condensate adaptive collection system provided by this utility model integrates multiple functions such as biogas dehydration, adaptive safe collection, delivery, and precise control, and is suitable for various biogas pipeline coarse dehydration application scenarios in large-scale biogas projects.

[0014] This condensate adaptive collection system utilizes the natural soil temperature to cool the crude biogas, achieving coarse dehydration and significant energy savings. It is equipped with a safety lock for rapid sealing and opening; in the closed state, it regulates the pressure balance during condensate collection and delivery; in the open state, it serves as a maintenance access point.

[0015] This invention uses an ultrasonic level meter and a submersible pump to precisely control the liquid level of the collection system. It sets up a system interlocking safety feedback mechanism to trigger level control commands such as LZA+, LA+, LS+, LS-, and LZA-. It features fully automatic control and is easy to operate and maintain. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of one embodiment of the present invention;

[0017] Figure 2 This is a top view of one embodiment of the present invention.

[0018] In the diagram: 1. Fermentation tank; 2. Protection device; 3. Pressure balancing device; 4. Ultrasonic level gauge; 5. Check valve; 6. Condensate drainage pipe; 7. Liquid level interlocking control system; 8. Coarse biogas pipe; 9. Flexible waterproof sleeve; 10. Riser support; 11. Variable frequency submersible pump; 12. High-high alarm liquid level LZA+; 13. High alarm liquid level LA+; 14. Normal operation high liquid level LZ+; 15. Normal operation low liquid level LZ-; 16. Low-low alarm liquid level LZA-. Detailed Implementation

[0019] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0020] Exemplary embodiments of the present invention are now described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the present invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments shown in the drawings is not intended to limit the present invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0021] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0022] Example 1

[0023] This utility model provides an adaptive collection system for condensate from biogas pipelines, such as... Figure 1 As shown, the system includes a fermentation tank 1, a level gauge, a coarse biogas pipeline 8, a condensate drainage pipeline 6, and a level interlock control system 7. The fermentation tank 1 is located underground. The coarse biogas pipeline 8 and the condensate drainage pipeline 6 are both located inside the fermentation tank 1 and below the frozen soil, with one end of each pipeline extending out of the fermentation tank 1. The coarse biogas pipeline 8 is symmetrically arranged along the central axis of the fermentation tank 1 and is lower than the condensate drainage pipeline 6. A variable frequency submersible pump 11 is installed at the bottom of the condensate drainage pipeline 6. The coarse biogas pipeline 8 has a slope. The variable frequency submersible pump 11 is electrically connected to the level interlock control system 7 and starts and stops by receiving commands from the level interlock control system 7.

[0024] Working principle:

[0025] The coarse biogas pipeline 8 is laid underground below the frost line. The soil temperature cools the biogas pipeline, causing water vapor in the gas to condense. A slope of 1-5‰ is set so that the condensate flows to the fermentation tank 1 under gravity. The liquid level interlocking control system 7 monitors the liquid level of the fermentation tank 1 in real time. When the liquid level reaches the set value, a signal is sent to the variable frequency submersible pump 11 to control the start and stop of the variable frequency submersible pump 11, thereby discharging the condensate.

[0026] Example 2

[0027] Based on Example 1, this example provides a biogas pipeline condensate adaptive collection system. The liquid level interlock control system 7 includes a PLC controller, and the liquid level gauge is an ultrasonic liquid level gauge 4. The ultrasonic liquid level gauge 4 is installed at the top of the fermentation tank 1. The variable frequency submersible pump 11 and the ultrasonic liquid level gauge 4 are both electrically connected to the PLC controller.

[0028] The ultrasonic level gauge 4 detects the liquid level in real time and sends the data to the PLC controller. When the PLC controller detects that the liquid level has reached the set values, the PLC controller sends a signal to the variable frequency submersible pump 11, thereby controlling the start and stop of the variable frequency submersible pump 11.

[0029] Example 3

[0030] Based on Example 1, this example provides an adaptive collection system for condensate from biogas pipelines. The fermentation tank 1 is equipped with a protection device 2 on top, which includes a safety lock and a pressure balancing device 3.

[0031] like Figure 1 and Figure 2 As shown, the protection device 2 is equipped with a safety lock and a pressure balancing device 3, which has the ability to quickly close and open; in the closed state, it can also be used as a pressure balance in the process of condensate collection and delivery of the system; in the open state, it can also be used as an inspection and maintenance port.

[0032] Example 4

[0033] Based on Example 1, this example provides an adaptive collection system for condensate from biogas pipelines, wherein the slope of the coarse biogas pipeline 8 is 1-5‰.

[0034] By setting a suitable slope, the installation of the coarse biogas pipeline 8 and the collection of condensate are facilitated. The coarse biogas pipeline 8 is installed via the riser support 10.

[0035] Example 5

[0036] Based on Example 2, this example provides an adaptive collection system for condensate from biogas pipelines. The PLC controller is set with high-high alarm level LZA+12, high alarm level LA+13, normal operation high level LZ+14, normal operation low level LZ-15, and low-low alarm level LZA-16.

[0037] The coarse biogas pipeline 8 is a flexible waterproof sleeve 9.

[0038] To ensure the water seal of biogas during fermentation, clean water needs to be injected in advance to the normal operating high liquid level LZ+14 to ensure that biogas is not released from this point. During fermentation, 0.3~15kPa(G) crude biogas (hydrogen sulfide content 100~1500ppm, saturated water) flows through the biogas pipeline, utilizing the natural soil temperature to cool and dehydrate the crude biogas. The biogas pipeline condensate adaptive collection system continuously collects condensate from the biogas pipeline. When the liquid level rises to the high alarm level LZA+ controlled by the interlock, the variable frequency submersible pump 11 receives the instruction from the liquid level interlock control system 7 and starts. While condensate is continuously collected in the biogas pipeline, it is discharged from the system through the condensate drain pipe 6. A check valve 5 is installed on the condensate drain pipe 6 to prevent condensate backflow.

[0039] During this process, the system continuously collects condensate from the biogas pipeline. Once the water level drops to the low normal operating level LZ-15 position controlled by the interlock, the liquid level interlock control system 7 issues a command to stop the operation of the variable frequency submersible pump 11. During operation, the liquid level of the collection system may rise continuously to the high high alarm level LZA+12 controlled by the interlock due to the large amount of condensate collected in the biogas pipeline and the outflow rate being less than the inflow rate. This triggers an alarm and a liquid level adjustment command, causing the variable frequency submersible pump to increase the drainage speed until the liquid level reaches the low normal operating level LZ-15 position controlled by the interlock and then the pump stops.

[0040] In another scenario, the variable frequency submersible pump 11 delivers more water than it collects, causing a rapid drop in the liquid level. The system's condensate is then sent to the interlocked control's low-level (LZ-15) signal, which malfunctions and fails to stop the pump in time. This causes the liquid level to approach the interlocked low-low alarm level (LZA-16), triggering a system alarm and forcibly stopping the pump. This prevents the liquid level from becoming too low, resulting in insufficient water seal and biogas overflowing from the condensate outlet, which could cause a safety accident.

[0041] In summary, under normal circumstances, this adaptive collection system, by setting the aforementioned interlocking control requirements, can achieve adaptive collection of condensate from biogas pipelines in biogas projects. This ensures that biogas does not leak from the system while safely reducing the subsequent biogas dehydration load. It can adapt to coarse biogas dehydration treatment capacities ranging from 0 to 4000 Nm³ / h, with a load operating range of 0% to 110%. The discharged condensate can also be returned to the fermentation pretreatment system for reuse.

[0042] The above examples are merely illustrative of this utility model and do not constitute a limitation on the scope of protection of this utility model. All designs that are the same as or similar to this utility model are within the scope of protection of this utility model.

Claims

1. A biogas pipeline condensate adaptive collection system, characterized in that: The system includes a fermenter, a level gauge, a coarse biogas pipeline, a condensate drainage pipeline, and a level interlock control system. The fermenter is located underground and filled with clean water for biogas water sealing. Both the coarse biogas pipeline and the condensate drainage pipeline are located inside the fermenter and below the frozen soil, with one end extending out of the fermenter. The coarse biogas pipeline is symmetrically arranged along the central axis of the fermenter and is lower than the condensate drainage pipeline. A variable frequency submersible pump is installed at the bottom of the condensate drainage pipeline. The coarse biogas pipeline has a slope. The variable frequency submersible pump is electrically connected to the level interlock control system and starts and stops upon receiving commands from the level interlock control system. The fermenter is equipped with a protective device on top, which includes a safety lock and a pressure balancing device. The slope of the crude biogas pipeline is 1-5‰.

2. The adaptive collection system for condensate from a biogas pipeline according to claim 1, characterized in that: The liquid level interlocking control system includes a PLC controller, and the liquid level gauge is an ultrasonic liquid level gauge installed at the top of the fermentation tank. Both the variable frequency submersible pump and the ultrasonic liquid level gauge are electrically connected to the PLC controller.

3. The adaptive collection system for condensate from a biogas pipeline according to claim 2, characterized in that: The PLC controller is set with high-high alarm liquid level LZA+, high alarm liquid level LA+, normal operation high liquid level LZ+, normal operation low liquid level LZ-, and low-low alarm liquid level LZA-.

4. The biogas pipeline condensate adaptive collection system according to claim 1, characterized in that: The coarse biogas pipeline is a flexible waterproof sleeve.

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