Filtering and drying device for biogas purification

Abstract

The utility model relates to the technical field of drying equipment, in particular to a filtering and drying device for biogas purification. Comprising a drying tank, a plurality of groups of vortex type condensation pipes are arranged in the drying tank, a plurality of groups of centrifugal fans are arranged above the vortex type condensation pipes in the drying tank at intervals, an upwards inclined gas guide cover is arranged on the side of each group of centrifugal fan in the drying tank, and a condenser is embedded in each gas guide cover; the exhaust pipe communicates with a drying box, and multiple sets of water absorption plates are arranged in the drying box at intervals. The biogas is firstly refrigerated by a vortex type condensation pipe in the drying tank, so that part of water vapor is condensed; through the cooperation of a plurality of groups of centrifugal fans and gas guide hoods, the biogas is circularly diffused in a reciprocating manner, so that the residual water vapor is fully contacted with the condenser to be condensed; finally, multiple groups of water absorption plates in the drying box are used for filtering and absorbing for multiple times, so that water vapor in the biogas is completely discharged, the dehydration effect is remarkable, and the dehydration efficiency is good.

Description

Technical Field

[0001] This application relates to the field of drying equipment technology, and in particular to a filtration and drying device for biogas purification. Background Technology

[0002] Biogas purification involves removing impurities from biogas to produce high-quality CH4 with high methane content and calorific value and impurity composition that meet natural gas standards. Biogas produced from anaerobic digesters carries a significant amount of moisture, especially during mesophilic or hyperthermic fermentation, resulting in high humidity. As biogas flows through pipelines, temperature and pressure changes lower the dew point, causing water vapor condensation and increasing flow resistance, potentially damaging storage tanks. Furthermore, the presence of water vapor reduces the calorific value of the biogas. Therefore, it is necessary to remove condensate from the biogas. The most common method is condensation dehydration.

[0003] Dehydration using condensation can be achieved in two ways: either by coiling delivery pipes around a cooler for cooling and dehydration, but in this method, condensate is difficult to drain and accumulates in the coils, causing corrosion; or by placing the cooler inside a tank, injecting biogas into the tank and passing it over the cooler, allowing the biogas to directly contact the condenser tubes for cooling and dehydration, while the condensate drains out through a drain pipe, without interference between the two methods. In this method, high biogas injection pressure causes the biogas to pass over the condenser tubes too quickly, allowing some water vapor to escape and resulting in incomplete dehydration. Conversely, low biogas injection pressure affects dehydration efficiency and wastes time.

[0004] Therefore, this application provides a filtration and drying device for biogas purification, which modifies the structure and distribution of the cooler inside the tank to allow the biogas to come into more full contact with the condenser tube, so as to achieve a balance between dehydration speed and efficiency. Utility Model Content

[0005] The purpose of this application is to provide a filtration and drying device for biogas purification in order to solve the problems existing in the prior art.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] A filtration and drying device for biogas purification includes a drying tank. The drying tank has an air inlet pipe at the bottom of its side wall, an exhaust pipe at the top wall, and a liquid drain pipe at the bottom wall. Multiple sets of vortex condenser tubes are arranged above the air inlet pipes inside the drying tank. Multiple sets of centrifugal fans are arranged at intervals above the vortex condenser tubes inside the drying tank. Each set of centrifugal fans is provided with an upward-sloping air guide hood on the side of each set of centrifugal fans. A condenser is embedded in each air guide hood.

[0008] The exhaust pipe is connected to a drying chamber, which contains multiple sets of water-absorbing plates at intervals.

[0009] Preferably, the drying tank is provided with a diffusion fan opposite to the air inlet pipe, and an upward gas collecting hood is arranged between the diffusion fan and the vortex condenser pipe.

[0010] Preferably, the gas guide cover is composed of a plurality of gas guide plates.

[0011] Preferably, the gas guide plates between adjacent gas guide covers are arranged in a staggered manner.

[0012] Preferably, the liquid discharge pipe is curved.

[0013] Preferably, a plurality of sunken insertion slots are arranged at the upper end of the drying box, and a water absorption plate is inserted into each insertion slot and fastened to the drying box by a fastener.

[0014] Preferably, the water absorption plate comprises a frame body, a mesh cover is arranged at the center of the frame body, and a water absorption material is stored in the mesh cover.

[0015] Compared with the prior art, the application provides a filtering and drying device for biogas purification, which has the following beneficial effects:

[0016] The biogas is first subjected to refrigeration by the vortex condenser pipe in the drying tank to condense part of the water vapor, then the biogas is reciprocally circulated and diffused through the cooperation of the multiple centrifugal fans and the gas guide cover, so that the remaining water vapor is fully contacted with the condenser to condense, and finally the water vapor in the biogas is completely removed through multiple filtering and absorption by the multiple water absorption plates in the drying box, so that the dehydration effect is remarkable; and the device does not need to reduce the input speed of the biogas, and the biogas can be injected into the drying system at a relatively high speed to ensure good dehydration efficiency.

[0017] Other advantages, objects, and features of the application will be set forth in part in the specification, and in part will become apparent to those skilled in the art upon examination of the following, or can be learned from practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The figure is a schematic diagram of the cross-sectional structure of the application.

[0019] Figure 2 The figure is a schematic diagram of the three-dimensional structure of the drying box of the application.

[0020] Figure 3 The figure is a schematic diagram of the cross-sectional structure of the drying tank of the application.

[0021] Figure 4 The figure is a schematic diagram of the three-dimensional structure of the application.

[0022] Figure 5 The figure is a schematic diagram of the water absorption plate structure of the application.

[0023] Figure: 1, drying tank; 2, drying box; 3, air inlet pipe; 4, exhaust pipe; 5, liquid discharge pipe; 6, diffusion fan; 7, gas collection cover; 8, vortex condenser; 9, centrifugal fan; 10, gas guide cover; 11, water absorption plate. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings. Figures 1-5 The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0025] In order to solve the problems in the prior art, the present embodiment provides a filter drying device for biogas purification, which comprises a drying tank 1, wherein the bottom end of the side wall of the drying tank 1 is provided with an air inlet pipe 3, the top wall is provided with an exhaust pipe 4, and the bottom wall is provided with a liquid discharge pipe 5. A plurality of vortex condensers 8 are arranged above the air inlet pipe 3 in the drying tank 1. A plurality of centrifugal fans 9 are arranged above the vortex condensers 8 in the drying tank 1. An upwardly inclined gas guide cover 10 is arranged on each side of each group of centrifugal fans 9 in the drying tank 1. A condenser is embedded on each gas guide cover 10.

[0026] The exhaust pipe 4 is connected to a drying box 2, and a plurality of water absorption plates 11 are arranged in the drying box 2.

[0027] The principle of the present solution is as follows:

[0028] A filter drying device for biogas purification comprises a drying tank 1 and a drying box 2. The drying tank 1 and the drying box 2 are stably installed by being supported by metal supports.

[0029] The bottom end of the side wall of the drying tank 1 is provided with an air inlet pipe 3, the top wall is provided with an exhaust pipe 4, and the bottom wall is provided with a liquid discharge pipe 5. The drying box 2 is provided with an air inlet and an air outlet. The exhaust pipe 4 of the drying tank 1 is connected to the air inlet of the drying box 2. The liquid discharge pipe 5 is provided with an electric valve.

[0030] A plurality of vortex condensers 8 are vertically and spaced apart arranged in the drying tank 1, and the vortex condensers 8 are arranged above the position where the air inlet pipe 3 communicates with the drying tank 1.

[0031] A rotating shaft is rotatably installed on the top wall of the drying tank 1, and the rotating shaft is driven by a motor fixedly installed on the end surface of the drying tank 1. The bottom end of the rotating shaft is higher than the uppermost vortex condenser 8. A plurality of centrifugal fans 9 are tightly and spaced apart installed on the rotating shaft. An upwardly inclined gas guide cover 10 is arranged on each side of each group of centrifugal fans 9 in the drying tank 1. A condenser is embedded on each gas guide cover 10. The outer edge surface of the centrifugal fan 9 is similar in size to the upper end of the gas guide cover 10.

[0032] A plurality of water absorption plates 11 are arranged in the drying box 2.

[0033] According to the above technical scheme,

[0034] In use, the biogas is injected into the drying tank 1 through the gas inlet pipe 3 and diffused. The biogas is cooled after passing through the multiple sets of vortex condensing pipes 8, and part of the water vapor is condensed and dripped. Then the biogas passing through the vortex condensing pipes 8 is stirred by the centrifugal fans 9 and diffused on the inner wall of the drying tank 1, and then floats up along the gas guide cover 10 and rushes to the upper layer of the centrifugal fans 9, and is stirred by the upper layer of the centrifugal fans 9 and diffused on the inner wall of the drying tank 1. The gas guide cover 10 is embedded with a condenser, which is any one of a condensing pipe and a condensing plate. The biogas is diffused and contacted with the condenser for multiple cycles, so that the water vapor in the biogas is fully cooled, and the water vapor condenses into water droplets on the gas guide cover 10 and drips down. The dripped water droplets gather at the bottom end of the drying tank 1 and are discharged from the liquid discharge pipe 5.

[0035] The biogas after multiple stirring finally enters the exhaust pipe 4 and enters the drying box 2. Through multiple sets of water absorption plates 11, the residual water vapor in the biogas is absorbed again to ensure complete dehydration of the biogas.

[0036] According to the above technical scheme, the biogas first experiences cooling by the vortex condensing pipes 8 in the drying tank 1 to condense part of the water vapor; then through the cooperation of multiple sets of centrifugal fans 9 and gas guide covers 10, the biogas is repeatedly diffused and circulated, so that the remaining water vapor is fully contacted with the condenser to condense; finally, the biogas is filtered multiple times by multiple sets of water absorption plates 11 in the drying box 2, so that the water vapor in the biogas is completely removed, the dehydration effect is remarkable; and this equipment does not need to reduce the input speed of the biogas, the biogas can maintain a relatively high speed to be injected into the drying system, to ensure good dehydration efficiency.

[0037] In a further embodiment of the present scheme, the drying tank 1 is provided with a diffusion fan 6 opposite the gas inlet pipe 3, and an upwardly inclined gas collecting cover 7 is arranged between the diffusion fan 6 and the vortex condensing pipes 8 in the drying tank 1. Through the cooperation of the diffusion fan 6 and the gas collecting cover 7, the biogas injected into the drying tank 1 from the gas inlet pipe 3 diffuses everywhere instead of concentrating in one place and floating up, so that the contact area of the biogas with the vortex condensing pipes 8 is increased, and the dehydration efficiency is improved.

[0038] In the present scheme, a plurality of through holes are provided at the joint between the gas collecting cover 7 and the gas guide cover 10 and the inner wall of the drying tank 1, for the downward flow of the condensed water droplets.

[0039] In a further embodiment of the present scheme, the gas guide cover 10 is composed of a plurality of gas guide plates. The gas guide plates between adjacent gas guide covers 10 are arranged in an interlaced manner. This makes the diffused and floated state of the biogas more dispersed and random, and cooperates with the centrifugal fans 9 to make the stirring state of the biogas more violent, so that the water vapor can effectively contact with the condenser on the gas guide cover 10 to ensure good dehydration effect. At the same time, gaps are provided between the gas guide plates to provide a downward flow channel for the condensed water droplets.

[0040] In a further embodiment of the present solution, the drain pipe 5 is curved. This forms a water seal effect, which prevents the biogas from escaping from the drain pipe 4.

[0041] In a further embodiment of the present solution, a plurality of sunken slots are provided at the upper end of the drying box 2, and a water absorbing plate 11 is inserted into each slot. The water absorbing plate 11 is fastened to the drying box 2 by fasteners. The water absorbing plate 11 can be easily replaced. The water absorbing plate 11 comprises a frame body, and a mesh cover is arranged at the center of the frame body. The mesh cover stores water absorbing material. The frame body is matched with the slot, and a sealing gasket is arranged to seal and firmly fix the water absorbing plate 11. A handle is arranged on the frame body to facilitate the pulling of the water absorbing plate 11. The water absorbing material can be any one of silica gel, aluminum oxide, magnesium oxide, and water absorbing salt, which all have good water absorbing properties.

[0042] In the present solution, the temperature of the condensation dehydration is not lower than the dew point of the biogas (methane), which prevents the biogas from being liquefied after being cooled and pressurized in the drying tank 1 and the drying box 2.

[0043] The above merely provides the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can make equivalent replacements or changes to the technical solutions and the application concept of the present application within the technical scope disclosed by the present application, which should be covered by the protection scope of the present application.

[0044] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. The illustrative description of the above terms in the present specification does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0045] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those skilled in the art can make changes, modifications, replacements, and variations to the above embodiments within the scope of the present application.

Claims

1. A filter drying device for biogas purification, characterized in that, The utility model relates to a drying device, including dry tank (1), dry tank (1) bottom end of side wall is equipped with air inlet pipe (3), top wall is equipped with exhaust pipe (4), bottom wall is equipped with liquid discharge pipe (5), dry tank (1) is located in air inlet pipe (3) top and is equipped with multiple groups of vortex condenser pipe (8), dry tank (1) is located in vortex condenser pipe (8) top and is equipped with multiple groups of centrifugal fan (9) interval, dry tank (1) is located in each centrifugal fan (9) side and is equipped with the gas guide cover (10) of inclination, each gas guide cover (10) all embeds with condenser, exhaust pipe (4) is connected with dry box (2), dry box (2) is equipped with multiple groups of water absorption board (11) interval. The utility model relates to a drying device, including dry tank (1), dry tank (1) bottom end of side wall is equipped with air inlet pipe (3), top wall is equipped with exhaust pipe (4), bottom wall is equipped with liquid discharge pipe (5), dry tank (1) is located in air inlet pipe (3) top and is equipped with multiple groups of vortex condenser pipe (8), dry tank (1) is located in vortex condenser pipe (8) top and is equipped with multiple groups of centrifugal fan (9) interval, dry tank (1) is located in each centrifugal fan (9) side and is equipped with the gas guide cover (10) of inclination, each gas guide cover (10) all embeds with condenser, exhaust pipe (4) is connected with dry box (2), dry box (2) is equipped with multiple groups of water absorption board (11) interval.

2. The filter drying device for biogas purification according to claim 1, characterized in that, The utility model relates to a drying device, including dry tank (1), dry tank (1) bottom end of side wall is equipped with air inlet pipe (3), top wall is equipped with exhaust pipe (4), bottom wall is equipped with liquid discharge pipe (5), dry tank (1) is located in air inlet pipe (3) top and is equipped with multiple groups of vortex condenser pipe (8), dry tank (1) is located in vortex condenser pipe (8) top and is equipped with multiple groups of centrifugal fan (9) interval, dry tank (1) is located in each centrifugal fan (9) side and is equipped with the gas guide cover (10) of inclination, each gas guide cover (10) all embeds with condenser, exhaust pipe (4) is connected with dry box (2), dry box (2) is equipped with multiple groups of water absorption board (11) interval.

3. The filtering and drying device for biogas purification according to claim 1, characterized in that, The utility model relates to a drying device, including dry tank (1), dry tank (1) bottom end of side wall is equipped with air inlet pipe (3), top wall is equipped with exhaust pipe (4), bottom wall is equipped with liquid discharge pipe (5), dry tank (1) is located in air inlet pipe (3) top and is equipped with multiple groups of vortex condenser pipe (8), dry tank (1) is located in vortex condenser pipe (8) top and is equipped with multiple groups of centrifugal fan (9) interval, dry tank (1) is located in each centrifugal fan (9) side and is equipped with the gas guide cover (10) of inclination, each gas guide cover (10) all embeds with condenser, exhaust pipe (4) is connected with dry box (2), dry box (2) is equipped with multiple groups of water absorption board (11) interval.

4. The filtering and drying device for biogas purification according to claim 3, characterized in that, The utility model relates to a drying device, including dry tank (1), dry tank (1) bottom end of side wall is equipped with air inlet pipe (3), top wall is equipped with exhaust pipe (4), bottom wall is equipped with liquid discharge pipe (5), dry tank (1) is located in air inlet pipe (3) top and is equipped with multiple groups of vortex condenser pipe (8), dry tank 5. The filtering and drying device for biogas purification according to claim 1, characterized in that, ​ 6. The filtering and drying device for biogas purification according to claim 1, characterized in that, ​ 7. The filter drying device for biogas purification according to claim 6, characterized in that, ​

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