A parallel filtration and switching system for gas-solid separation of raw materials

Abstract

This utility model relates to the technical field of industrial fluid filtration and purification devices, and in particular to a parallel filtration and switching system for gas-solid separation of raw material gas, comprising three pre-filters. This utility model establishes a pipeline system with mutual backup by setting interconnecting pipelines and first isolation valves between the outlets of the three parallel-operating pre-filters. When any filter requires maintenance, simply closing the inlet and outlet valves of that filter and opening the corresponding first isolation valve automatically switches it to be supplied by other filters without stopping the operation of the corresponding compressor. This completely changes the traditional "shutdown for filter maintenance" operation mode, avoiding frequent compressor start-stops caused by filter maintenance. It not only greatly reduces the process safety and mechanical failure risks caused by frequent start-stops of high-pressure large equipment, but also reduces energy loss and equipment wear caused by the start-stop of backup units, improving the effective production time and operational economy of the device.

Description

Technical Field

[0001] This utility model relates to the technical field of industrial fluid filtration and purification devices, and in particular to a parallel filtration and switching system for separating raw gas and solids. Background Technology

[0002] In industrial fields such as natural gas processing and chemical production, raw gas is often mixed with impurities such as dust and solid particles. These impurities need to be finely purified and intercepted by gas-solid filtration and separation devices to prevent them from entering downstream equipment and causing wear, blockage, and malfunctions. Fluid filtration and purification is an essential unit operation in chemical processes.

[0003] Currently, in industrial applications for high-flow continuous production, a configuration mode of multiple filter units matched one-to-one with the downstream gas-consuming equipment is commonly used. Typically, three pre-filters are independently matched with three raw material gas compressors, forming an independent filtration and gas supply structure of "one machine, one filter". The pipelines of each filtration system are independent and have no interconnection structure.

[0004] During the actual operation of fluid filtration, the filter element will continuously accumulate dirt and solid particles, and the operating resistance will gradually increase over time. When the pressure difference reaches the threshold, the filter unit must be maintained by replacing the filter media and cleaning the filter element.

[0005] Existing traditional filtration systems have inherent technical defects: each filtration unit is independent and has no backup flow path. When a single filter is under maintenance, the airflow to that filter path must be cut off, and the corresponding gas compressor must be shut down and the standby unit activated to maintain production, which reduces the overall online rate of the unit and the continuity of production. At the same time, frequent start-ups and shutdowns of the compressor will aggravate mechanical wear, increase the probability of equipment failure, affect the reliability of long-term operation, and also cause waste of raw material gas energy. Traditional independent filtration pipelines lack pressure buffers and airflow equalization structures, and airflow pulsation and pressure transients are prone to occur when temporarily switching gas supply, which interferes with the stable delivery of downstream filtered fluid and affects the overall gas-solid separation and purification effect. Utility Model Content

[0006] This invention provides a parallel filtration and switching system for separating raw gas and solid gases, which can effectively solve the above problems.

[0007] This utility model is implemented as follows:

[0008] A parallel filtration and switching system for gas-solid separation of raw material gas includes: three pre-filters, three raw material gas compressors respectively connected to each pre-filter, filter inlet valves respectively installed at the inlet of each pre-filter, filter outlet valves respectively installed at the outlet of each pre-filter, and an interconnecting pipeline connecting the three filtered gas flows, wherein the interconnecting pipeline is provided with a first isolation between the outlets of two adjacent pre-filters.

[0009] A pulsating buffer tank is connected in series on the interconnecting pipeline. The pulsating buffer tank includes a tank body. The left and right ends of the tank body are respectively connected to the interconnecting pipeline, and the upper and lower ends of the tank body are respectively connected to the outlet pipeline of the intermediate pre-filter and the inlet pipeline of the intermediate raw material gas compressor. Multiple baffles are provided on the left and right sides of the tank body at intervals along the axial direction of the tank body. Each baffle has a vent hole. The vent holes of adjacent baffles are staggered. The edges of the baffles are sealed to the inner wall of the tank body.

[0010] As a further improvement, two sets of flow guiding devices are provided on the left and right sides of the tank body respectively. Each set of flow guiding devices consists of two symmetrically arranged flow guiding cones. One flow guiding cone is located at the connection between the tank body and the interconnecting pipeline, and the other flow guiding cone is located at the connection between the tank body and the outlet pipeline of the intermediate pre-filter. The flow guiding cones are used to disperse the airflow entering the tank body and guide it to the vent holes of the baffle plate.

[0011] As a further improvement, the baffles are arranged in parallel to each other, and the total area of ​​the vent holes on each baffle accounts for 30% to 40% of the total area of ​​the baffle.

[0012] As a further improvement, counting from the connection end between the tank and the interconnecting pipeline towards the center of the tank, the vent holes of the odd-numbered baffle layers are located at the bottom of the corresponding baffle, and the vent holes of the even-numbered baffle layers are located at the top of the corresponding baffle.

[0013] As a further improvement, each of the raw material gas compressors is equipped with a second isolation valve in its inlet pipeline.

[0014] As a further improvement, the inner wall of the tank is provided with a sound-absorbing material layer, which is composed of glass wool and has a filling thickness of 20mm to 40mm.

[0015] The beneficial effects of this utility model are:

[0016] 1. This utility model establishes an interconnected pipeline system with a first isolation valve between the outlets of three parallel-operating pre-filters, forming a pipeline system that serves as a backup for each other. When any filter requires maintenance, simply closing the inlet and outlet valves of that filter and opening the corresponding first isolation valve will automatically switch it to be supplied by other filters without stopping the operation of the corresponding compressor. This completely changes the traditional "shutdown for filter maintenance" operation mode, avoiding frequent compressor start-stop due to filter maintenance. It not only greatly reduces the process safety and mechanical failure risks caused by frequent start-stop of high-pressure large equipment, but also reduces energy loss and equipment wear caused by the start-stop of backup equipment, improving the effective production time and operating economy of the device. At the same time, the system can be modified by adding only a few valves and fittings to the original pipeline, making it simple in structure, easy to operate, and highly reliable.

[0017] 2. This utility model uses a series of pulsating buffer tanks connected in the interconnected pipeline. The staggered baffles inside the tank cause the airflow to turn multiple times to dissipate the kinetic energy of pressure pulsation. In addition, the symmetrically arranged guide cones evenly disperse the high-speed airflow and guide it to the air vents of the baffles. This effectively eliminates the pressure transient impact caused by the opening of the first isolation valve during online switching. Regardless of whether the airflow flows from left to right or from right to left, and regardless of whether one or two first isolation valves are opened at the same time, the pressure shock wave can be prevented from being directly transmitted to the compressor inlet, preventing compressor surge or interlock shutdown. Moreover, the baffles and guide cones are fixed structures with no moving parts, resulting in high system reliability and low maintenance costs. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a parallel filtration and switching system for gas-solid separation of raw material gas provided by this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the pulsating buffer tank provided by this utility model.

[0021] In the diagram: 1. Pre-filter; 2. Raw material gas compressor; 3. Filter inlet valve; 4. Filter outlet valve; 5. Interconnecting pipeline; 6. First isolation valve; 7. Pulsating buffer tank; 71. Tank body; 72. Baffle plate; 73. Vent hole; 74. Guide cone; 75. Sound-absorbing material layer. Detailed Implementation

[0022] All embodiments of this utility model are intended to fall within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to illustrate selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0023] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating that the purpose, technical solution, and advantages of the method are clearer. The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without inventive effort indicate or imply the relative importance of the indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] Each filtration unit operates independently without a backup flow path. When a single filter needs maintenance, the airflow to that filter path must be cut off, requiring the corresponding gas compressor to be shut down and the standby unit activated to maintain production. This reduces the overall online rate and production continuity of the units. Furthermore, frequent compressor starts and stops exacerbate mechanical wear, increase the probability of equipment failure, affect long-term operational reliability, and waste raw material gas energy. Traditional independent filtration pipelines lack pressure buffering and airflow equalization structures, making them prone to airflow pulsations and pressure transients during temporary gas supply switching. This interferes with the stable delivery of downstream filtered fluids, affecting the overall gas-solid separation and purification effect. To address these technical problems, this paper proposes the following technical solution:

[0025] like Figure 1 As shown, the compressor inlet filter switching device of this utility model includes three pre-filters 1 connected in parallel, denoted as filter A, filter B, and filter C, respectively. The outlets of the three pre-filters 1 are respectively connected to three raw material gas compressors 2 through pipelines, denoted as compressor a, compressor b, and compressor c, respectively.

[0026] Three pre-filters 1 serve as the core filtration unit for gas-solid separation, respectively intercepting and purifying dust and solid particles in the raw material gas. The filtered clean airflow is then transported to the corresponding raw material gas compressor 2 via pipeline.

[0027] Each pre-filter 1 is equipped with a filter inlet valve 3 at its inlet and a filter outlet valve 4 at its outlet. An interconnecting pipe 5 connects the outlets of the three pre-filters 1, forming a parallel network.

[0028] Interconnected pipeline 5 connects the three independent filtration and purification flow paths, constructing a multi-unit filtration backup pipeline network. This allows the other filtration units to compensate for the gas supply when a single filtration unit is under maintenance, ensuring the continuous operation of the entire fluid filtration and purification system.

[0029] On the interconnecting line 5, a first isolation valve 6 is installed between the outlets of two adjacent pre-filters 1. Specifically, one first isolation valve 6 is installed on the interconnecting line between the outlets of filter A and filter B, and another first isolation valve 6 is installed on the interconnecting line between the outlets of filter B and filter C. Under normal operating conditions, the first isolation valves 6 are closed, and the three filters independently supply air to their respective compressors.

[0030] An example of an online switching operation is shown using isolation filter B:

[0031] When filter B needs cleaning due to increased resistance after approximately 1000 hours of operation, the operator shall perform the following steps:

[0032] 1. Confirm that filters A and C are working properly;

[0033] 2. Slowly close the filter inlet valve 3 and filter outlet valve 4 of filter B to isolate filter B from the system;

[0034] 3. Slowly open the first isolation valve 6 located between filter A and filter B, and / or the other first isolation valve 6 located between filter B and filter C;

[0035] 4. At this time, the intake air of compressor b is automatically switched through interconnecting pipe 5 to be supplied with gas filtered by filter A and / or filter C;

[0036] 5. After ensuring that the inlet and outlet valves of filter B are tightly closed, maintenance operations such as depressurization, disassembly, and replacement of filter media can be performed on filter B;

[0037] 6. Throughout the entire process, compressor b does not need to be stopped, ensuring the continuity of production.

[0038] The entire switching process does not interrupt the gas-solid filtration and purification process of the raw material gas, and always maintains the gas supply at the back end as a clean gas flow that has been fully filtered and screened, meeting the process continuity requirements of fluid separation and purification in the chemical and natural gas industries.

[0039] Similarly, either filter A or filter C can be isolated and maintained without affecting the operation of the corresponding compressor, enabling flexible switching between the three filters as backups for each other.

[0040] In the aforementioned mutually backup pipeline system, when the first isolation valve 6 opens to establish an alternative gas path, the outlet of the filter operating on the high-pressure side rapidly charges the compressor inlet pipeline corresponding to the isolated filter on the low-pressure side. This causes a pressure transient in the pipeline, resulting in a momentary fluctuation in the downstream compressor's intake pressure, which may trigger compressor surge or interlock shutdown. To solve this problem, this invention incorporates a pulsation buffer tank 7 connected in series on the interconnecting pipeline 5.

[0041] like Figure 2 As shown, the pulsating buffer tank 7 includes a tank body 71. The tank body 71 has a cross-shaped cylindrical structure, and its left and right ends are respectively connected to the interconnecting pipeline 5 by welding. The upper and lower ends of the tank body 71 are respectively connected to the outlet pipeline of the intermediate pre-filter 1 (i.e., filter B) and the inlet pipeline of the intermediate raw material gas compressor 2 (i.e., compressor b) by welding.

[0042] The tank body 71 has multiple baffles 72 arranged at intervals along the axial direction of the tank body 71 on both its left and right sides. In this embodiment, each side has four layers of baffles 72, which are arranged parallel to each other and perpendicular to the axis of the tank body 71. Each baffle 72 has a vent hole 73, and the vent holes 73 of adjacent layers of baffles 72 are staggered.

[0043] Specifically, the odd and even layer counting of the baffle 72 starts from the air inlet connection end between the tank 71 and the interconnecting pipe 5. The first layer is recorded as the odd layer, and the counting proceeds sequentially towards the center of the tank 71. The odd-numbered layer vents 73 are located at the bottom of the baffle 72, and the even-numbered layer vents are located at the top, forming an alternating flow channel. After the airflow enters from one side of the tank 71, it is forced to flow along a serpentine path of "down → up → down → up". Each time it passes through a baffle 72, the direction changes once. Compared with ordinary openings, the pressure pulsation kinetic energy is dissipated through multiple turns, resulting in more sufficient airflow disturbance and better pulsation attenuation effect. This can effectively prevent the pressure shock wave from being transmitted to the compressor inlet during switching.

[0044] The total area of ​​the vents 73 on each baffle 72 accounts for 30% to 40% of the total area of ​​the baffle 72, which ensures normal airflow while generating sufficient resistance to pulsating components.

[0045] The edge of the baffle plate 72 is sealed to the inner wall of the tank 71 to prevent the airflow from bypassing the baffle structure from the edge, ensuring that all airflow passes through the multi-stage turning and damping attenuation of the designed path.

[0046] Two sets of flow guiding devices are provided on the left and right sides of the tank body 71. Each set of flow guiding devices consists of two symmetrically arranged flow guiding cones 74. One flow guiding cone 74 is located at the connection between the tank body 71 and the interconnecting pipe 5, between the outermost baffle 72 and the end of the tank body 71; the other flow guiding cone 74 is located at the connection between the tank body 71 and the outlet pipe of the intermediate pre-filter 1. The two flow guiding cones 74 are symmetrically arranged, with the apex of the flow guiding cone 74 located at the connection between the tank body 71 and the interconnecting pipe 5 facing outward from the tank body, and the apex of the flow guiding cone 74 located at the connection between the tank body 71 and the outlet pipe of the intermediate pre-filter 1 facing inward from the tank body.

[0047] When the high-speed airflow enters the tank 71 from the interconnecting pipe 5 or the intermediate filter outlet pipe, it first impacts the guide cone 74. The guide cone 74 disperses the concentrated high-speed airflow into an airflow that is evenly distributed radially along the tank 71 and smoothly guides it to the vent 73 of the baffle plate 72, avoiding direct impact of the airflow on the surface of the baffle plate 72.

[0048] A sound-absorbing material layer 75 is provided on the inner wall of the tank body 71. The sound-absorbing material layer 75 is made of glass wool with a filling thickness of 20mm to 40mm, covering the entire surface of the inner wall of the tank body 71 except for the installation area of ​​the baffle 72, and is used to absorb the high-frequency noise generated when the airflow turns between the baffles 72.

[0049] Taking the isolation filter B and opening the first isolation valve 6 to establish an alternative gas path as an example:

[0050] The moment the first isolation valve 6 opens, high-pressure gas rapidly charges into the low-pressure side, generating a pressure shock wave. This shock wave propagates along the interconnecting pipeline 5 and first enters the pulsation buffer tank 7. The high-speed airflow is first dispersed by the guide cone 74 to avoid direct impact on the baffle plate 72. The airflow passes through each layer of baffle plate 72 in sequence, changing direction multiple times under the guidance of the staggered vents 73. The pulsating kinetic energy is dissipated step by step, and the residual high-frequency pulsation is absorbed by the sound-absorbing material layer 75 on the inner wall of the tank 71. The stabilized airflow flows out of the tank 71 and into the downstream interconnecting pipeline 5, where it is distributed to the inlets of each compressor. Throughout the switching process, compressor inlet pressure fluctuations are effectively suppressed, avoiding the risks of surge and interlock shutdown.

[0051] A second isolation valve 8 is also provided on the inlet pipeline of each raw material gas compressor 2, which is used to completely disconnect the compressor from the upstream pipeline system when necessary.

[0052] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A parallel feedstock gas and solids separation and filtration system comprising: The system comprises three pre-filters (1), three raw material gas compressors (2) respectively connected to each pre-filter (1), filter inlet valves (3) respectively installed at the inlet of each pre-filter (1), and filter outlet valves (4) respectively installed at the outlet of each pre-filter (1). The system is characterized by: an interconnecting pipeline (5) connecting the three filtered gas streams; a first isolation valve (6) located between the outlets of two adjacent pre-filters (1) on the interconnecting pipeline (5); and a pulsating buffer tank (7) connected in series on the interconnecting pipeline (5). (7) Includes a tank body (71), the left and right ends of the tank body (71) are respectively connected to the interconnecting pipeline (5), the upper and lower ends of the tank body (71) are respectively connected to the outlet pipeline of the intermediate pre-filter (1) and the inlet pipeline of the intermediate raw material gas compressor (2); the left and right sides of the tank body (71) are respectively provided with multiple baffles (72) spaced apart along the axial direction of the tank body (71), each baffle (72) is provided with a vent hole (73), the vent holes (73) of two adjacent baffles are staggered, and the edge of the baffle (72) is sealed to the inner wall of the tank body (71).

2. A parallel feedstock gas gas-solid separation and filter switching system as claimed in claim 1, characterized in that: The tank (71) is provided with two sets of flow guiding devices on the left and right sides respectively. Each set of flow guiding devices consists of two flow guiding cones (74) symmetrically arranged. One flow guiding cone (74) is located at the connection between the tank (71) and the interconnecting pipeline (5), and the other flow guiding cone (74) is located at the connection between the tank (71) and the outlet pipeline of the intermediate pre-filter (1). The flow guiding cone (74) is used to disperse the airflow entering the tank (71) and guide it to the vent (73) of the baffle plate (72).

3. A parallel feedstock gas gas-solid separation and filter switching system as claimed in claim 1, wherein: The baffles (72) are arranged in parallel to each other, and the total area of ​​the vent holes (73) on each baffle (72) accounts for 30% to 40% of the total area of ​​the baffle (72).

4. A parallel feedstock gas gas-solid separation and filter switching system as claimed in claim 3, characterized in that: Counting from the connection end of the tank (71) and the interconnecting pipeline (5) toward the center of the tank (71), the vent holes (73) of the odd-numbered layer baffles (72) are located at the bottom of the corresponding baffles (72), and the vent holes (73) of the even-numbered layer baffles (72) are located at the top of the corresponding baffles (72).

5. A parallel feedstock gas gas-solid separation and filter switching system as claimed in claim 1, wherein: Each of the raw material gas compressors (2) is equipped with a second isolation valve (8) in its inlet pipeline.

6. A parallel feed filter bypass system for separating solids from a raw gas as recited in claim 1, wherein: The inner wall of the tank (71) is provided with a sound-absorbing material layer (75), which is made of glass wool and has a filling thickness of 20mm to 40mm.

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