A front pre-cooling biogas compressor

Abstract

The utility model discloses a front precooling's marsh gas compressor relates to marsh gas energy utilization equipment field, and it aims at solving the problem of insufficient gas pretreatment of existing compressor. The compressor includes host computer, primary filter, gas -liquid separator, pre -cooler and cooling module, and pre -cooler is equipped with air precooling flow channel and cooling heat exchange flow channel, and the cooling heat exchange flow channel is circulated with refrigerant. After the external gas is pre -cooled through air precooling flow channel, enters the primary filter and filters out moisture and particulate matter, and then is sent to the host computer intake end from the primary filter gas -out end. The gas compressed by host computer is passed into gas -liquid separator, and the separated liquid, gas two -phase is connected with cooling module processing respectively. The equipment passes through front precooling and filter and promotes the quality of admission, and cooperates with gas -liquid separation and cooling system and guarantees output gas quality, enhances the stability of compressor operation, and reduces maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of biogas compressor technology, and in particular to a pre-cooled biogas compressor. Background Technology

[0002] With the transformation of energy structure and the deepening of environmental protection concepts, the development and efficient utilization of renewable energy has become one of the core development directions in the global energy sector. Biogas, as a biomass renewable energy source with methane as its main component, is widely derived from the anaerobic fermentation process of livestock and poultry breeding waste, agricultural straw, industrial organic wastewater, and urban domestic waste. It can not only reduce and harmlessly treat organic waste, but also provide clean power for production and daily life through energy conversion, occupying a pivotal position in the energy conservation, emission reduction, and resource recycling system.

[0003] The large-scale application of biogas relies on efficient collection, storage, and transportation systems. The biogas compressor, as the core power equipment in this system, primarily functions to compress and increase the pressure of the low-pressure biogas produced by anaerobic fermentation, thereby meeting the needs of various scenarios such as long-distance pipeline transportation, high-pressure storage, generator set intake, and vehicle fuel. Therefore, the operational stability, compression efficiency, and compressed gas quality of the biogas compressor directly determine the economic efficiency and reliability of biogas energy utilization, and are a crucial link in ensuring the efficient operation of the biogas industry chain.

[0004] With the rapid development of the biogas industry, the market's performance requirements for biogas compressors are constantly increasing. However, existing biogas compressors still have many technical shortcomings in practical applications, hindering their further promotion and optimization. Among these, the lack of a gas pretreatment stage is particularly prominent. Currently, most mainstream biogas compressors on the market operate by directly introducing external air (or a mixture containing biogas) into the compressor unit for compression, without a dedicated air pretreatment system or only equipped with a simple filtration device, failing to provide comprehensive and effective pretreatment of the gas entering the unit.

[0005] This design flaw directly results in a large amount of untreated moisture from the external gas entering the compressor. Since biogas fermentation occurs in an anaerobic and humid environment, the resulting biogas and surrounding air typically have high moisture content. When untreated gas enters the compression chamber, the moisture in the gas easily condenses into liquid water as pressure increases and temperature changes during compression. This liquid water, when mixed with the compressed gas, significantly reduces the purity and calorific value of the compressed biogas, affecting the efficiency of subsequent combustion, power generation, and other end-use applications. Simultaneously, the presence of moisture exacerbates corrosion and wear on critical moving parts such as cylinders, pistons, and valves inside the compressor, shortening equipment lifespan and increasing maintenance costs and downtime risks. Furthermore, the condensed moisture may accumulate in the compressed gas delivery pipeline, causing blockages or corrosion, further impacting the operational safety and stability of the entire biogas delivery system. Utility Model Content

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a pre-cooled biogas compressor.

[0007] A pre-cooled biogas compressor designed for this purpose includes a main unit, a primary filter, a gas-liquid separator, a precooler, and a cooling module. The precooler is equipped with an air precooling channel and a cooling heat exchange channel; The air inlet of the main unit is connected to the air outlet of the primary filter; The air inlet of the primary filter is connected to the air outlet of the air precooling channel; the air inlet of the air precooling channel is connected to the outside. The cooling heat exchange channel of the precooler is circulated with refrigerant; The primary filter is used to filter moisture and particulate matter from the air; The inlet of the gas-liquid separator is connected to the outlet of the main unit; both the liquid outlet and the gas outlet of the gas-liquid separator are connected to the cooling module.

[0008] Preferably, the air outlet of the cooling module is connected to a post-filter module.

[0009] Preferably, the cooling module includes a first cooler, a second cooler, and a third cooler; The first cooler, the second cooler, and the third cooler are all equipped with cooling channels and heat exchange channels inside; The cooling channels of the first cooler are respectively connected to the liquid outlet of the gas-liquid separator and the liquid inlet of the main unit; The cooling channels of the second cooler are respectively connected to the outlet end of the gas-liquid separator and the inlet end of the cooling channels of the third cooler; The output end of the cooling channel of the third cooler is the air source output port.

[0010] Preferably, the post-filtration module includes a steam-water separator and an oil-gas separator connected in series. The air output end of the steam-water separator is connected to the input end of the oil-gas separator; The input end of the steam-water separator is connected to the air output end of the cooling module.

[0011] As a preferred option, it also includes a low-temperature refrigerant inlet pipe, a low-temperature refrigerant return pipe, a normal-temperature refrigerant inlet pipe, and a normal-temperature refrigerant return pipe; The output end of the low-temperature refrigerant input pipe is connected to the cooling heat exchange channel of the precooler and the heat exchange channel of the third cooler; The low-temperature refrigerant return pipe is connected to the cooling heat exchange channel of the precooler and the cooling channel of the third cooler; The ambient temperature refrigerant inlet pipe is connected to the heat exchange channels of the first cooler and the second cooler; The ambient temperature refrigerant return pipe is connected to the heat exchange channels of the first cooler and the second cooler; The low-temperature refrigerant inlet pipe and the low-temperature refrigerant return pipe are connected to an external low-temperature refrigerant supply device; The ambient temperature refrigerant inlet pipe and the ambient temperature refrigerant return pipe are connected to an external ambient temperature refrigerant supply device.

[0012] Compared with the prior art, the pre-cooled biogas compressor proposed in this invention has significant advantages, specifically in the following aspects: First, this solution achieves efficient dehydration and purification of the gas, improving the quality of the compressed gas. It constructs a dual gas purification mechanism through a pre-treatment combination of a pre-cooler and a primary filter: the pre-cooler's air pre-cooling channel pre-cools the incoming external gas, causing water vapor in the gas to reach saturation and condense into liquid water, laying the foundation for subsequent dehydration; subsequently, the primary filter accurately filters out condensed water and mixed particulate matter from the gas, effectively solving the problem of high water content caused by the lack of gas pretreatment in traditional compressors. After this treatment, the gas enters the main compressor with significantly improved purity and calorific value, directly meeting the needs of scenarios with high gas quality requirements, such as long-distance transportation and automotive fuel, avoiding efficiency losses caused by gas impurities in subsequent applications.

[0013] Secondly, it reduces main unit wear, extends equipment lifespan, and lowers maintenance costs. After pre-treatment, moisture and particulate matter are effectively removed from the gas entering the main unit, preventing corrosion and wear of critical moving parts such as cylinders, pistons, and valves by liquid water and impurities during compression. Simultaneously, the dry, clean gas is less prone to scale buildup during compression, reducing the probability of component jamming, seal failure, and other malfunctions. This not only extends the compressor's lifespan but also reduces the frequency and cost of equipment downtime for maintenance, improving the stability and economy of equipment operation. Attached Figure Description

[0014] Figure 1 This is one of the three-dimensional structural schematic diagrams of this utility model; Figure 2 This is the second three-dimensional structural schematic diagram of the present invention; Figure 3 This is the third three-dimensional structural schematic diagram of this utility model. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] See Figures 1-3 A pre-cooled biogas compressor includes a main unit 10, a primary filter 20, a gas-liquid separator 30, a precooler 40, and a cooling module 50. The precooler 40 is provided with an air precooling channel and a cooling heat exchange channel. The air inlet of the main unit 10 is connected to the air outlet of the primary filter 20. The air inlet of the primary filter 20 is connected to the air outlet of the air precooling channel. The air inlet of the air precooling channel is connected to the outside. A refrigerant flows through the cooling heat exchange channel of the precooler 40. The primary filter 20 is used to filter moisture and particulate matter in the air. The air inlet of the gas-liquid separator 30 is connected to the air outlet of the main unit 10. The liquid outlet and air outlet of the gas-liquid separator 30 are both connected to the cooling module 50.

[0017] The pre-cooling biogas compressor achieves efficient pretreatment and compression of biogas through the synergistic action of multiple stages: pre-cooling, primary filtration, main unit compression, gas-liquid separation, and cooling circulation. The specific workflow is as follows: Pre-cooling stage: The mixed gas (or air) containing biogas from the outside first enters the air pre-cooling channel of the pre-cooler, where it forms an efficient heat exchange with the refrigerant flowing outside the channel. Utilizing the low-temperature characteristics of the refrigerant in the cooling heat exchange channel, the temperature of the mixed gas drops rapidly. Some of the gaseous moisture condenses into liquid water upon cooling, reducing the processing load on subsequent filtration stages and minimizing the moisture content entering the compressor unit from the source.

[0018] Primary filtration stage: The pre-cooled gas mixture enters the primary filter from the outlet of the air pre-cooling channel. The primary filter uses commercially available products and employs physical interception and adsorption to remove dust, impurities, and other particulate matter carried in the gas mixture, preventing them from causing wear on components such as cylinders and pistons after entering the main unit. Furthermore, it separates and retains the liquid water condensed during the pre-cooling stage and any remaining water vapor in the gas, further purifying the gas and ensuring that the gas entering the main unit meets the basic cleanliness and dryness requirements for compression operation.

[0019] Compression stage of the main unit: The pre-treated clean gas enters the inlet of the compressor main unit from the outlet of the primary filter. The main unit compresses and pressurizes the gas through the reciprocating motion of the internal cylinder and piston (or the operation of other compression structures) to achieve the required pressure level and improve the energy density of biogas.

[0020] Gas-liquid separation and cooling cycle: The compressed oily gas enters the gas-liquid separator from the main unit's outlet, where the density difference between oil and gas is used to achieve efficient separation. This completely separates the oil mixed in with the compressed gas, while also trapping liquid water that condenses again due to pressure increases and temperature fluctuations during compression, thus doubly ensuring the purity and calorific value of the output biogas. The separated oil (and a small amount of liquid water) flows from the gas-liquid separator's outlet to the cooling module, while the separated clean gas also enters the cooling module. After passing through the cooling module, the gas is transported to the next process, while the oil flows back to the main unit for recycling.

[0021] In this invention, the gas-liquid separator uses an existing oil-gas separator. Additionally, an oil-water separator can be installed between the cooling module and the main unit as needed to further separate the water from the oil. The oil-water separator can be a commercially available product.

[0022] See Figures 1 to 3 The cooling module 50 has a post-filter module 60 connected to its outlet. The post-filter module 60 can further filter water and oil from the air to improve the quality of the compressed air.

[0023] See Figures 1 to 3The cooling module 50 includes a first cooler 510, a second cooler 520, and a third cooler 530. Each of the three coolers has internal cooling channels and heat exchange channels. The cooling channels of the first cooler 510 are connected to the liquid outlet of the gas-liquid separator 30 and the liquid inlet of the main unit 10. The cooling channels of the second cooler 520 are connected to the gas outlet of the gas-liquid separator 30 and the input of the cooling channels of the third cooler 530. The output of the cooling channels of the third cooler 530 is a gas source output port. The cooling module 50 achieves precise heat exchange and medium control through the coordinated operation of the three-stage coolers. Its core principle is based on the independent heat exchange mechanism of the cooling channels and heat exchange channels of each cooler. The liquid medium separated by the gas-liquid separator 30 first enters the cooling channel of the first cooler 510. After internal heat exchange and cooling, it is directly delivered to the liquid inlet of the main unit 10 to provide cooling for the main unit's operation. The gaseous medium separated by the gas-liquid separator 30 enters the cooling channel of the second cooler 520. After initial cooling, it flows to the cooling channel of the third cooler 530 for deep cooling. During this process, refrigerant is continuously introduced into the heat exchange channels inside the three coolers. Through heat exchange, the heat of the medium in the cooling channels is efficiently absorbed, ultimately ensuring that the gaseous medium processed by the third cooler 530 reaches a stable output standard and is supplied externally from the gas source output port at the output end of its cooling channel.

[0024] See Figures 1 to 3 The post-filtration module 60 includes a water-gas separator 610 and an oil-gas separator 620 connected in series. The water-gas separator 610 and the oil-gas separator 620 employ existing technology. The air output of the water-gas separator 610 is connected to the input of the oil-gas separator 620. The input of the water-gas separator 610 is connected to the air output of the cooling module 50. The post-filtration module 60 operates with a step-by-step purification logic of "removing water first, then oil," relying on the series synergistic mechanism of the water-gas separator 610 and the oil-gas separator 620. Biogas from the cooling module 50 first enters the water-gas separator 610, where residual liquid water and water mist are efficiently captured and separated through centrifugal separation or filter media adsorption. The pre-dehydrated biogas is then precisely delivered to the oil-gas separator 620 through its air output. The 620 oil-gas separator targets and filters oil mist and droplets carried in biogas. It uses high-efficiency adsorption materials or interception technology to completely separate oil impurities, ultimately enabling the biogas to reach a high purity standard after dual purification, providing a high-quality gas source for subsequent end applications.

[0025] This invention also includes a low-temperature refrigerant inlet pipe, a low-temperature refrigerant return pipe, a normal-temperature refrigerant inlet pipe, and a normal-temperature refrigerant return pipe. The output end of the low-temperature refrigerant inlet pipe is connected to the cooling heat exchange channel of the precooler 40 and the heat exchange channel of the third cooler 530. The low-temperature refrigerant return pipe is connected to the cooling heat exchange channel of the precooler 40 and the cooling channel of the third cooler 530. The normal-temperature refrigerant inlet pipe is connected to the heat exchange channels of the first cooler 510 and the second cooler 520. The normal-temperature refrigerant return pipe is connected to the heat exchange channels of the first cooler 510 and the second cooler 520. The low-temperature refrigerant inlet pipe and the low-temperature refrigerant return pipe are connected to an external low-temperature refrigerant supply device. The normal-temperature refrigerant inlet pipe and the normal-temperature refrigerant return pipe are connected to an external normal-temperature refrigerant supply device. This system provides suitable heat exchange media for different devices through independent circulation of low-temperature and normal-temperature refrigerant pipelines, achieving precise temperature control. Low-temperature refrigerant is supplied from external equipment via a low-temperature refrigerant inlet pipe, simultaneously delivered to the cooling heat exchange channels of precooler 40 and third cooler 530. After absorbing heat from the medium to be treated, it returns to the external equipment through the low-temperature refrigerant return pipe to complete the cycle, providing low-temperature protection for biogas precooling and deep cooling. Normal-temperature refrigerant is supplied from external equipment via a normal-temperature refrigerant inlet pipe, entering the heat exchange channels of first cooler 510 and second cooler 520. After exchanging heat with the liquid cooling medium and the initially cooled gaseous medium, it returns to the normal-temperature refrigerant return pipe, meeting the temperature requirements for main unit cooling and initial biogas cooling. The coordinated circulation of these two types of refrigerants ensures heat exchange efficiency and equipment operational stability at each stage.

[0026] In this invention, the refrigerant is cold water or room temperature water. The precooler 40 and the third cooler 530 are filled with cold water. Condensation is achieved through low-temperature cold water. The compressed gas is further cooled in the third cooler 530 and then removed by a steam-water separator to achieve a two-stage water removal effect.

[0027] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. 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 technical features indicated.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A pre-cooled biogas compressor, characterized in that: It includes a main unit (10), a primary filter (20), a gas-liquid separator (30), a precooler (40), and a cooling module (50); The precooler (40) is provided with an air precooling channel and a cooling heat exchange channel; The air inlet of the main unit (10) is connected to the air outlet of the primary filter (20); The air inlet of the primary filter (20) is connected to the air outlet of the air precooling channel; the air inlet of the air precooling channel is connected to the outside. The cooling heat exchange channel of the precooler (40) is circulated with refrigerant; The primary filter (20) is used to filter moisture and particulate matter from the air; The inlet of the gas-liquid separator (30) is connected to the outlet of the host (10); both the liquid outlet and the gas outlet of the gas-liquid separator (30) are connected to the cooling module (50).

2. The pre-cooled biogas compressor according to claim 1, characterized in that: The cooling module (50) is connected to a post-filter module (60) at its air outlet.

3. A pre-cooled biogas compressor according to claim 1, characterized in that: The cooling module (50) includes a first cooler (510), a second cooler (520), and a third cooler (530); The first cooler (510), the second cooler (520) and the third cooler (530) are all provided with cooling channels and heat exchange channels inside; The cooling channels of the first cooler (510) are respectively connected to the liquid outlet of the gas-liquid separator (30) and the liquid inlet of the main unit (10); The cooling channels of the second cooler (520) are respectively connected to the outlet of the gas-liquid separator (30) and the input of the cooling channel of the third cooler (530); The output end of the cooling channel of the third cooler (530) is the air source output port.

4. A pre-cooled biogas compressor according to claim 2, characterized in that: The post-filter module (60) includes a gas-water separator (610) and an oil-gas separator (620) connected in series. The air output end of the gas-water separator (610) is connected to the input end of the oil-gas separator (620); The input end of the steam-water separator (610) is connected to the air output end of the cooling module (50).

5. A pre-cooled biogas compressor according to claim 3, characterized in that: It also includes a low-temperature refrigerant inlet pipe, a low-temperature refrigerant return pipe, a normal-temperature refrigerant inlet pipe, and a normal-temperature refrigerant return pipe; The output end of the low-temperature refrigerant input pipe is connected to the cooling heat exchange channel of the precooler (40) and the heat exchange channel of the third cooler (530); The low-temperature refrigerant return pipe is connected to the cooling heat exchange channel of the precooler (40) and the cooling channel of the third cooler (530); The ambient temperature refrigerant inlet pipe is connected to the heat exchange channels of the first cooler (510) and the second cooler (520); The ambient temperature refrigerant return pipe is connected to the heat exchange channels of the first cooler (510) and the second cooler (520); The low-temperature refrigerant inlet pipe and the low-temperature refrigerant return pipe are connected to an external low-temperature refrigerant supply device; The ambient temperature refrigerant inlet pipe and the ambient temperature refrigerant return pipe are connected to an external ambient temperature refrigerant supply device.

Images