Biogas efficient storage and cyclic utilization system based on hydrate method

Abstract

The invention relates to the technical field of new energy and renewable energy sources, in particular to a biogas efficient storage and cyclic utilization system based on a hydrate method. Comprising a processing module configured to preprocess biogas, a storage module configured to store the pretreated biogas, and a decomposition module configured to heat the storage module, the decomposition module is configured to decompose biogas and collect the biogas generated by decomposition, the circulation module is configured to collect residual energy in the decomposition heating process of the decomposition module for cyclic utilization, and the purification and compression module is configured to purify and compress the biogas generated by decomposition. The intelligent control module is configured to perform real-time control and monitoring on operation parameters of each device in the biogas production process; through innovative technical design and an intelligent control strategy, efficient storage and cyclic utilization of the biological natural gas are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy and renewable energy, and in particular to a biogas efficient storage and recycling system based on a hydrate method. Background Art

[0002] With the continuous growth of global energy demand and increasingly stringent environmental protection requirements, the search for clean, renewable energy sources has become a critical issue facing society today. Biogas, as an important renewable energy source, holds broad application prospects. Produced primarily by microbial fermentation of organic matter under anaerobic conditions, its primary component is methane. It is a clean, efficient energy source that can be used in a variety of sectors, including power generation, heating, and transportation fuel. It plays a crucial role in reducing reliance on traditional fossil fuels and lowering greenhouse gas emissions. However, the production and use of biogas face several key challenges, with storage and recycling being particularly challenging. Firstly, biogas is flammable, explosive, and difficult to store. Traditional storage methods suffer from low efficiency and poor safety, making them difficult to meet the demands of large-scale application. Secondly, the production and use of biogas generates significant amounts of waste heat and exhaust gases. Failure to effectively recover and utilize this energy not only results in energy waste, but also increases production costs and reduces the overall efficiency of biogas utilization. Summary of the Invention

[0003] In view of this, the present invention addresses the deficiencies of the prior art and proposes a biogas efficient storage and recycling system based on the hydrate method, aiming to solve at least one of the problems raised in the above background technology.

[0004] The present invention provides a biogas efficient storage and recycling system based on the hydrate method, comprising: a processing module configured to pre-treat the biogas;

[0005] a storage module configured to store pre-treated biogas;

[0006] a decomposition module configured to heat the storage module and collect biogas generated by the decomposition;

[0007] A circulation module is configured to collect and recycle the remaining energy during the decomposition and heating process of the decomposition module;

[0008] a purification and compression module configured to purify and compress the biogas produced by the decomposition;

[0009] The intelligent control module is configured to perform real-time control and monitoring of operating parameters of various equipment in the biogas production process.

[0010] In some embodiments, the processing module is configured to pre-process the biogas, including removing acid gases and heavy metals from the biogas.

[0011] In some embodiments, when the storage module is configured to store pre-processed biogas, it includes:

[0012] A horizontal reactor is used to store biogas and water. A stirring device and a gas separator are provided inside the horizontal reactor, and an insulation layer is provided on the inner wall of the horizontal reactor.

[0013] In some embodiments, the decomposition module is configured to heat the storage module and collect the biogas produced by decomposition, including: when the stored biogas needs to be used, the temperature in the reactor is increased by a heating system, and the heating system is electric heating.

[0014] In some embodiments, when the purification and compression module is configured to purify and compress the biogas produced by decomposition, it includes:

[0015] Pressure swing adsorption is used to remove residual impurities in biogas, and the purified biogas is compressed and stored in high-pressure gas cylinders.

[0016] In some embodiments, when the recycling module is configured to collect and recycle the remaining energy during the decomposition and heating process of the decomposition module, it includes:

[0017] A heat exchanger is provided on the outlet pipe of the horizontal reactor, and is used to recover the waste heat of the decomposed gas and water, and transfer the waste heat to the biogas at the inlet pipe of the horizontal reactor.

[0018] In some embodiments, when the recycling module is configured to collect and recycle the energy remaining during the decomposition and heating process of the decomposition module, it further includes:

[0019] The decomposed water is passed through a sedimentation tank for sedimentation, and further passed through a sand filter and activated carbon filter to remove suspended solids and dissolved organic matter;

[0020] Cation exchange resin is used to remove hardness ions in the water, anion exchange resin is used to remove sulfate and chloride ions, and finally a vacuum degassing tower is used to remove dissolved carbon dioxide and methane in the water.

[0021] In some embodiments, when the recycling module is configured to collect and recycle the energy remaining during the decomposition and heating process of the decomposition module, it further includes:

[0022] Install an exhaust gas collection device at the tail end of the gas-using equipment to collect incompletely burned gas. The exhaust gas is purified through a pressure swing adsorption device to remove carbon dioxide and oxygen.

[0023] The purified tail gas is compressed and then injected into the interior of the horizontal reactor.

[0024] In some embodiments, the intelligent control module is configured to perform real-time control and monitoring of operating parameters of various devices in the biogas production process, including:

[0025] Temperature sensors, pressure sensors, and flow sensors are installed on each device during the biogas production process. The data information monitored by the temperature sensors, pressure sensors, and flow sensors are transmitted to the central controller via wireless communication. The central controller controls the working parameters of each device based on the data information.

[0026] In some embodiments, when the intelligent control module is configured to perform real-time control and monitoring of the operating parameters of each device in the biogas production process, it also includes: when the data information monitored by the temperature sensor, pressure sensor, and flow sensor exceeds the corresponding pre-threshold value, the central controller issues an early warning signal.

[0027] Compared with existing technologies, the present invention offers the following advantages: By storing biogas through the hydrate method, the specialized internal design of the horizontal reactor (such as a stirring device, gas separator, and insulation layer) effectively improves the storage efficiency and stability of biogas, while reducing energy consumption and safety risks during storage. The system features a recycling module to collect excess energy generated during the heating process in the decomposition module. This energy is then recycled and reused through a series of processing steps, including a heat exchanger, sedimentation tank, sand filter, activated carbon filter, ion exchange resin, and vacuum degassing tower, significantly improving energy efficiency and reducing production costs. An intelligent control module monitors and controls the operating parameters of various devices in the biogas production process, including temperature, pressure, and flow rate, in real time, ensuring optimal system operation. Furthermore, when abnormal data is detected, a central controller issues a timely warning signal, ensuring production safety and improving system reliability and stability. Pressure swing adsorption technology is used to remove impurities from biogas, and the installation of an exhaust gas collection device purifies the biogas, reducing harmful emissions. Furthermore, exhaust gas recovery and reuse further reduces greenhouse gas emissions, meeting environmental requirements. The system not only achieves efficient storage and recycling of biogas, but also ensures maximum utilization of resources and improves the overall utilization value of biogas through intelligent control and optimized processing processes.

[0028] The foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure.

[0029] Other features and aspects of the present disclosure will become more apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 This is a functional block diagram of a biogas efficient storage and recycling system based on the hydrate method provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0033] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0036] See Figure 1 As shown, according to an embodiment of the present application, a biogas efficient storage and recycling system based on the hydrate method includes:

[0037] a processing module configured to pre-process the biogas;

[0038] a storage module configured to store pre-treated biogas;

[0039] a decomposition module configured to heat the storage module and collect biogas generated by the decomposition;

[0040] A circulation module is configured to collect and recycle the remaining energy during the decomposition and heating process of the decomposition module;

[0041] a purification and compression module configured to purify and compress the biogas produced by the decomposition;

[0042] The intelligent control module is configured to perform real-time control and monitoring of operating parameters of various equipment in the biogas production process.

[0043] In some specific embodiments, the processing module is configured to pre-process the biogas, including removing acid gases and heavy metals in the biogas.

[0044] It should be understood that processes such as filtration, desulfurization, and decarbonization are used to remove particulate impurities, acidic gases such as hydrogen sulfide and carbon dioxide, and harmful substances such as heavy metals from biogas to prevent them from having adverse effects on the subsequent hydrate formation process, such as clogging pipelines, corroding equipment, and interfering with hydrate formation conditions. For example, carbon dioxide can be removed through methods such as activated carbon adsorption and absorption with sodium hydroxide solution, and hydrogen sulfide can be removed using metal oxides or activated carbon desulfurizers. The composition of the treated biogas is analyzed, and according to the requirements of hydrate formation, some inert gases (such as nitrogen) are appropriately added or the concentration of major components such as methane is adjusted to optimize the conditions and performance of hydrate formation. For example, when the methane content in biogas is low, methane can be enriched through technologies such as membrane separation to improve the efficiency and storage capacity of hydrate formation.

[0045] In some specific embodiments, when the storage module is configured to store pre-processed biogas, it includes:

[0046] A horizontal reactor is used to store biogas and water. A stirring device and a gas separator are provided inside the horizontal reactor, and an insulation layer is provided on the inner wall of the horizontal reactor.

[0047] It should be understood that the horizontal reactor is constructed of high-pressure, low-temperature-resistant alloy materials. Multiple layers of stirring devices and gas distributors are installed within the reactor to ensure thorough mixing and uniform contact between the biogas and water, promoting the rapid growth of hydrate crystals. The reactor walls are insulated with a highly efficient thermal insulation layer to reduce heat loss and maintain a low-temperature environment. Temperature and pressure sensors and a visualization window can also be installed to monitor parameter changes and crystal growth during hydrate formation in real time. A refrigeration system lowers the reactor temperature to the optimal range for hydrate formation (typically 0-10°C), while a pressurizing device raises the biogas pressure to the pressure required for hydrate formation (generally above the equilibrium pressure of methane hydrate). The temperature and pressure within the reactor are precisely controlled to maintain a stable, optimal range for rapid hydrate formation. For example, an automated temperature control system and pressure regulating valve are used to adjust the refrigeration capacity and pressure in real time based on sensor feedback to ensure efficient hydrate formation.

[0048] When hydrate formation reaches a certain level, gas injection is stopped to maintain the low temperature and high pressure environment within the reactor, achieving stable storage of biogas. Regular inspections of the reactor are conducted to monitor hydrate decomposition and storage pressure changes. By installing equipment such as level gauges, changes in hydrate storage levels are monitored in real time, allowing for the optimal management of gas release and utilization.

[0049] In some specific embodiments, the decomposition module is configured to heat the storage module and collect the biogas produced by decomposition, including: when the stored biogas needs to be used, the temperature in the reactor is increased by a heating system, and the heating system is electric heating.

[0050] It should be understood that when the stored biogas needs to be used, the temperature in the reactor is gradually increased by the heating system to destroy the stability of the hydrates and decompose them into gas and water.

[0051] Heating methods can be electric heating, hot oil circulation heating, or steam heating. The appropriate heating method should be selected based on actual needs and energy supply. At the same time, the pressure in the reactor is slowly reduced to promote the decomposition of hydrates.

[0052] The biogas produced by decomposition undergoes simple treatments such as drying and dust removal before entering the gas purification and compression unit. During the gas collection process, care must be taken to prevent moisture and impurities produced by hydrate decomposition from entering subsequent systems. Filters and dehydration devices can be installed.

[0053] In some specific embodiments, when the purification and compression module is configured to purify and compress the biogas produced by decomposition, it includes:

[0054] Pressure swing adsorption is used to remove residual impurities in biogas, and the purified biogas is compressed and stored in high-pressure gas cylinders.

[0055] It should be understood that advanced technologies such as pressure swing adsorption (PSA) or membrane separation can be used to further remove trace impurities remaining in biogas, such as water, oxygen, and nitrogen, thereby improving the purity and quality of the gas and meeting the needs of different application scenarios. The purified biogas is compressed to increase its energy density, facilitating storage and transportation. A multi-stage compression process can be used, equipped with efficient compressors and cooling systems, to reduce energy consumption and gas temperature during the compression process. The compressed biogas can be stored in facilities such as high-pressure gas cylinders, gas tanks, or underground gas storage facilities, and distributed and used according to user needs.

[0056] In some specific embodiments, when the recycling module is configured to collect and recycle the remaining energy during the decomposition and heating process of the decomposition module, it includes:

[0057] A heat exchanger is provided on the outlet pipe of the horizontal reactor, and is used to recover the waste heat of the decomposed gas and water, and transfer the waste heat to the biogas at the inlet pipe of the horizontal reactor.

[0058] In some specific embodiments, when the recycling module is configured to collect and recycle the remaining energy during the decomposition and heating process of the decomposition module, it further includes:

[0059] The decomposed water is passed through a sedimentation tank for sedimentation, and further passed through a sand filter and activated carbon filter to remove suspended solids and dissolved organic matter;

[0060] Cation exchange resin is used to remove hardness ions in the water, anion exchange resin is used to remove sulfate and chloride ions, and finally a vacuum degassing tower is used to remove dissolved carbon dioxide and methane in the water.

[0061] In some specific embodiments, when the recycling module is configured to collect and recycle the remaining energy during the decomposition and heating process of the decomposition module, it further includes:

[0062] Install an exhaust gas collection device at the tail end of the gas-using equipment to collect incompletely burned gas. The exhaust gas is purified through a pressure swing adsorption device to remove carbon dioxide and oxygen.

[0063] The purified tail gas is compressed and then injected into the interior of the horizontal reactor.

[0064] It should be understood that a large amount of waste heat is generated during the hydrate decomposition and heating process. By installing a waste heat recovery device, such as a heat exchanger, this waste heat can be recycled and used to preheat the biogas entering the reactor, heat the water used in the hydrate formation process, or other processes requiring heating, thereby improving the system's energy efficiency. The primary side of the heat exchanger is connected to the high-temperature gas outlet of the reactor, and the secondary side is connected to the biogas inlet pipeline of the processing module and the preheating system for the water used for hydrate formation. Through waste heat recovery, the biogas entering the reactor is preheated to a temperature close to the hydrate formation temperature, reducing the load on the refrigeration system.

[0065] The decomposed water enters a sedimentation tank to remove large impurities (such as hydrate residues). It then passes through sand filters and activated carbon filters to further remove suspended solids and dissolved organic matter. Ion exchange: Cation exchange resins are used to remove hardness ions such as calcium and magnesium from the water to prevent carbonate scaling during hydrate formation. Anion exchange resins are used to remove sulfate and chloride ions to prevent equipment corrosion. Degassing: A vacuum degassing tower removes dissolved gases such as carbon dioxide and methane from the water to ensure that the water quality meets the requirements for hydrate formation.

[0066] Tail gas collection devices are installed at the tail of gas-using equipment such as gas generators and boilers to collect incompletely burned gases (mainly methane, containing small amounts of carbon dioxide and nitrogen). The tail gas is purified by a pressure swing adsorption (PSA) device to remove carbon dioxide and oxygen, increasing the methane purity to over 95%. The purified tail gas is pressurized to 2-3 MPa by a screw compressor and then injected into the hydrate reactor through a pneumatic diaphragm valve. The reinjected gas is mixed with fresh biogas and participates in hydrate formation together. The reinjection ratio is adjusted by an intelligent control system (recommended not to exceed 20% of the total gas volume) to avoid affecting the hydrate formation efficiency.

[0067] In some specific embodiments, the intelligent control module is configured to perform real-time control and monitoring of operating parameters of various devices in the biogas production process, including:

[0068] Temperature sensors, pressure sensors, and flow sensors are installed on each device during the biogas production process. The data information monitored by the temperature sensors, pressure sensors, and flow sensors are transmitted to the central controller via wireless communication. The central controller controls the working parameters of each device based on the data information.

[0069] In some specific embodiments, when the intelligent control module is configured to perform real-time control and monitoring of the operating parameters of each device in the biogas production process, it also includes: when the data information monitored by the temperature sensor, pressure sensor, and flow sensor exceeds the corresponding pre-threshold value, the central controller issues an early warning signal.

[0070] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A biogas efficient storage and recycling system based on the hydrate method, characterized in that: include: a processing module configured to pre-process the biogas; a storage module configured to store pre-treated biogas; a decomposition module configured to heat the storage module and collect biogas generated by the decomposition; A circulation module is configured to collect and recycle the remaining energy during the decomposition and heating process of the decomposition module; a purification and compression module configured to purify and compress the biogas produced by the decomposition; The intelligent control module is configured to perform real-time control and monitoring of operating parameters of various equipment in the biogas production process.

2. The biogas efficient storage and recycling system based on the hydrate method according to claim 1 is characterized in that: When the processing module is configured to pre-process the biogas, the process includes removing acidic gases and heavy metals from the biogas.

3. The biogas efficient storage and recycling system based on the hydrate method according to claim 2 is characterized in that: When the storage module is configured to store pre-processed biogas, it includes: A horizontal reactor is used to store biogas and water. A stirring device and a gas separator are provided inside the horizontal reactor, and an insulation layer is provided on the inner wall of the horizontal reactor.

4. The biogas efficient storage and recycling system based on the hydrate method according to claim 3 is characterized in that: The decomposition module is configured to heat the storage module and collect the biogas produced by decomposition, including: when the stored biogas needs to be used, the temperature in the reactor is increased by a heating system, and the heating system is electric heating.

5. The biogas efficient storage and recycling system based on the hydrate method according to claim 4 is characterized in that: The purification and compression module is configured to purify and compress the biogas produced by decomposition, comprising: Pressure swing adsorption is used to remove residual impurities in biogas, and the purified biogas is compressed and stored in high-pressure gas cylinders.

6. The biogas efficient storage and recycling system based on the hydrate method according to claim 5 is characterized in that: The recycling module is configured to collect and recycle the remaining energy during the decomposition and heating process of the decomposition module, including: A heat exchanger is provided on the outlet pipe of the horizontal reactor, and is used to recover the waste heat of the decomposed gas and water, and transfer the waste heat to the biogas at the inlet pipe of the horizontal reactor.

7. The biogas efficient storage and recycling system based on the hydrate method according to claim 6 is characterized in that: When the recycling module is configured to collect and recycle the energy remaining during the decomposition and heating process of the decomposition module, it further includes: The decomposed water is passed through a sedimentation tank for sedimentation, and further passed through a sand filter and activated carbon filter to remove suspended solids and dissolved organic matter; Cation exchange resin is used to remove hardness ions in the water, anion exchange resin is used to remove sulfate and chloride ions, and finally a vacuum degassing tower is used to remove dissolved carbon dioxide and methane in the water.

8. The biogas efficient storage and recycling system based on the hydrate method according to claim 7 is characterized in that: When the recycling module is configured to collect and recycle the energy remaining during the decomposition and heating process of the decomposition module, it further includes: Install an exhaust gas collection device at the tail end of the gas-using equipment to collect incompletely burned gas. The exhaust gas is purified through a pressure swing adsorption device to remove carbon dioxide and oxygen. The purified tail gas is compressed and then injected into the interior of the horizontal reactor.

9. The biogas efficient storage and recycling system based on the hydrate method according to claim 8 is characterized in that: The intelligent control module is configured to perform real-time control and monitoring of operating parameters of various devices in the biogas production process, including: Temperature sensors, pressure sensors, and flow sensors are installed on each device during the biogas production process. The data information monitored by the temperature sensors, pressure sensors, and flow sensors are transmitted to the central controller via wireless communication. The central controller controls the working parameters of each device based on the data information.

10. The biogas efficient storage and recycling system based on the hydrate method according to claim 9, characterized in that: When the intelligent control module is configured to perform real-time control and monitoring of the operating parameters of each device in the biogas production process, it also includes: when the data information monitored by the temperature sensor, pressure sensor, and flow sensor exceeds the corresponding pre-threshold value, the central controller issues an early warning signal.

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