Liquefied natural gas replacement device

Abstract

The utility model relates to the technical field of gas treatment and energy conversion, and discloses a liquefied natural gas replacement device which comprises a base and a cyclone separator, one end of the cyclone separator is communicated with an exhaust port, the top of the exhaust port is communicated with a reactor, the inner wall of the reactor is fixedly connected with a plurality of catalyst bed layers, and the catalyst bed layers are fixedly connected with the base. Gas distribution plates are fixedly connected among the plurality of catalyst bed layers, the top of the reactor is communicated with an exhaust pipe, one end of the exhaust pipe is communicated with a heat exchanger, one end of the heat exchanger is communicated with a condensing tower, the bottom of the condensing tower is communicated with a liquid discharge pipe, and one end of the liquid discharge pipe is communicated with a water pump. According to the utility model, the feed gas enters the cyclone separator to further remove fine dust, and the pretreated gas enters the reactor through the exhaust port, so that the gas treatment efficiency is improved, the large-scale gas purification operation can be completed in a short time, and the production cycle is shortened.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas treatment and energy conversion technical field especially relates to a liquefied natural gas replacement device. BACKGROUND

[0002] At present, in the field of biomass energy conversion, especially in the process of waste oil hydrogenation conversion into biodiesel, a large amount of by-product liquefied gas will be produced, which contains hydrogen sulfide and carbon dioxide impurities. If not effectively treated, it will not only affect the quality of the subsequent process, but also cause serious pollution to the environment. Therefore, how to efficiently remove these harmful substances has become one of the research hotspots in this field.

[0003] Through retrieval, the patent of China with the publication number CN206089606U discloses a liquefied natural gas replacement device, which comprises: a gas conveying unit for conveying coke oven gas; a coke oven connected with the gas conveying unit; a compression unit connected with the coke oven for compressing coke oven gas; a temperature swing adsorption unit connected with the compression unit; a desulfurization unit connected with the temperature swing adsorption unit; and a cryogenic separation unit connected with the desulfurization unit. Through the above-mentioned mode, the coke oven gas formed by coke can be returned to the coke oven to replace the coke oven gas, and the methane in the coke oven gas can be extracted to prepare liquefied natural gas. The application of the main product coke and the recovery of the by-product coke oven gas of the coke oven are combined, and the economic benefit is fully improved. The existing gas treatment adopts physical adsorption method to adsorb impurities in gas through activated carbon and molecular sieve porous materials, but the adsorbent is easy to saturate and needs to be regenerated regularly, which increases the operating cost. Therefore, a liquefied natural gas replacement device is proposed to solve the above-mentioned problems. SUMMARY

[0004] In order to make up for the above shortcomings, the utility model provides a liquefied natural gas replacement device, which aims at improving the problem of physical adsorption method adsorbent easy to saturate, the need for regular regeneration and the increase of operating cost in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a liquefied natural gas replacement device, comprising a base and a cyclone separator, one end of the cyclone separator is communicated with an exhaust port, the top of the exhaust port is communicated with a reactor, the inner wall of the reactor is fixedly connected with a plurality of catalyst bed layers, a gas distribution plate is fixedly connected between the plurality of catalyst bed layers, the top of the reactor is communicated with an exhaust pipe, one end of the exhaust pipe is communicated with a heat exchanger, one end of the heat exchanger is communicated with a condensation tower, the bottom of the condensation tower is communicated with a liquid discharge pipe, one end of the liquid discharge pipe is communicated with a water pump, one end of the water pump is communicated with a control valve, the inner wall of the condensation tower is provided with a spraying assembly, and the left side of the cyclone separator is provided with a filtering mechanism.

[0006] Through the technical scheme, the raw gas is first filtered to remove large solid particles, and then enters the cyclone separator to further remove fine dust, so that the pretreated gas is relatively pure, thereby avoiding the risk of catalyst poisoning in subsequent processes. The pretreated gas enters the reactor, sequentially passes through three layers of stacked catalyst bed layers, in the process, hydrogen sulfide is captured by the active centers on the surface of the catalyst and undergoes oxidation-reduction reaction to generate elemental sulfur and water vapor, thereby achieving the purpose of desulfurization. The reacted gas enters the heat exchanger, rapidly cools under low temperature conditions, and then enters the condensing tower. The gas is fully contacted with the coolant through the spraying assembly, and finally forms a liquid product and is collected at the bottom.

[0007] As a further description of the above technical scheme:

[0008] The filter mechanism comprises a mounting cylinder, the right end of the mounting cylinder is communicated with the left end of the cyclone separator, a residue accumulation box is communicated with the left end of the mounting cylinder, a filter plate is fixedly connected to the inner wall of the mounting cylinder, a servo motor is fixedly connected to the left side of the residue accumulation box, the output end of the servo motor penetrates the left side of the residue accumulation box and is fixedly connected with a rotating rod, a cleaning brush is fixedly connected to the right end of the rotating rod, a feeding pipe is communicated with the top left side of the residue accumulation box, a residue discharge valve is communicated with the bottom of the residue accumulation box, and a residue discharge pipe is communicated with the bottom end of the residue discharge valve.

[0009] Through the technical scheme, the raw material is discharged into the residue accumulation box through the feeding pipe, and the large solid particles are filtered out through the filter plate. Most of the solid particles fall into the residue accumulation box, and a part of the solid particles adhere to the surface of the filter plate. The cleaning brush at the end of the rotating rod is started by starting the servo motor to rotate, so that the particles on the surface of the filter plate are scraped off, and the flowability of the pipeline is improved.

[0010] As a further description of the above technical scheme:

[0011] The spraying assembly comprises a water tank, the outer wall of the water tank is fixedly connected to the outer wall right side of the condensing tower, a water pipe is communicated with the top of the water tank, and one end of the water pipe penetrates the outer wall right side of the condensing tower and is communicated with a spraying device.

[0012] Through the technical scheme, the liquid in the water tank is extracted through the spraying device and the water pipe, and is sprayed in the condensing tower, so that the gas is fully contacted with the coolant, and finally forms a liquid product and is collected at the bottom.

[0013] As a further description of the above technical scheme:

[0014] The outer wall of the reactor is fixedly connected with a reinforcing plate, and the bottom of the reinforcing plate is fixedly connected with a support column.

[0015] Through the technical scheme, the reactor is reinforced by the reinforcing plate and the supporting column, and is connected with the cyclone separator, thereby improving the integrity.

[0016] Further description is made to the technical scheme:

[0017] The bottom end of the cyclone separator is communicated with a collecting box, and a storage box is slidably connected to the front side of the collecting box.

[0018] Through the technical scheme, the dust filtered by the cyclone separator can be collected in the storage box inside the collecting box, thereby facilitating subsequent cleaning.

[0019] Further description is made to the technical scheme:

[0020] The front side of the storage box is fixedly connected with a handle, and the outer wall of the handle is fixedly connected with an anti-skid sleeve.

[0021] Through the technical scheme:

[0022] Further description is made to the technical scheme:

[0023] The top left side of the base is fixedly connected with a controller, and the top front and rear sides of the base are fixedly connected with guardrails.

[0024] Through the technical scheme, the running equipment on the whole device can be conveniently and simply controlled by the controller.

[0025] Further description is made to the technical scheme:

[0026] The periphery of the base is fixedly connected with connecting plates, and the top of each of the connecting plates is threadedly connected with a bolt.

[0027] Through the technical scheme, the periphery of the base is positioned by the connecting plates, and the whole device is reinforced by the bolts, thereby ensuring the stability of the device.

[0028] The utility model has the advantages of:

[0029] 1. In the utility model, raw gas enters the cyclone separator to further remove fine dust, and the pretreated gas enters the reactor through the exhaust port, sequentially passes through the three-layer laminated arrangement of the catalyst bed and the gas distribution plate, in the process, hydrogen sulfide is captured by the active center on the surface of the catalyst and reacts with the active center to generate elemental sulfur and water vapor, the reacted gas enters the heat exchanger, rapidly cools down under low temperature conditions, and then enters the condensing tower, the gas is fully contacted with the refrigerant by the spraying equipment, finally forms liquid products and collects to the bottom collecting tank, improves the gas treatment efficiency, can complete large-scale gas purification operation in a short time, and reduces the production cycle.

[0030] 2. The utility model discloses, raw material gas passes through the feed pipe and enters the slag accumulation box in the middle, and the larger solid particles are filtered through the filter board, and a part of the large particle particles falls into the inside bottom of the slag accumulation box and is stored, and a small part of the particles is attached to the filter board surface, and the particles on the filter board surface are scraped off through the starting servo motor drive cleaning brush, and the slagging valve is opened through the regular control, and the particles flow into the collection box through the slagging pipe, and the cleaning and replacement treatment of the filter board are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 A perspective view of a liquefied natural gas displacement device is provided for the utility model;

[0032] Figure 2 A front view of a liquefied natural gas displacement device is provided for the utility model;

[0033] Figure 3 A structure diagram of a cyclone separator of a liquefied natural gas displacement device is provided for the utility model;

[0034] Figure 4 A structure diagram of a filter mechanism of a liquefied natural gas displacement device is provided for the utility model;

[0035] Figure 5 A structure diagram of a condensing tower of a liquefied natural gas displacement device is provided for the utility model.

[0036] LEGEND:

[0037] 1, base, 2, filter mechanism, 201, installation cylinder, 202, slag accumulation box, 203, filter board, 204, servo motor, 205, rotating rod, 206, cleaning brush, 207, feed pipe, 208, slagging valve, 209, slagging pipe, 3, cyclone separator, 4, exhaust port, 5, reactor, 6, catalyst bed, 7, gas distribution plate, 8, exhaust pipe, 9, heat exchanger, 10, condensing tower, 11, water tank, 12, water pipe, 13, spraying equipment, 14, liquid discharge pipe, 15, water pump, 16, control valve, 17, reinforcing plate, 18, support column, 19, collection box, 20, storage box, 21, handle, 22, antiskid sleeve, 23, controller, 24, connecting plate, 25, bolt, 26, guardrail. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0039] With reference to Figure 1 , Figure 3 and Figure 5 , the present application provides an embodiment: a liquefied natural gas displacement device, comprising a base 1 and a cyclone separator 3, one end of the cyclone separator 3 is communicated with an exhaust port 4, raw gas enters the cyclone separator 3 to further remove fine dust, the pretreated gas is relatively pure, and the risk of catalyst poisoning in subsequent processes is avoided, the top of the exhaust port 4 is communicated with a reactor 5, the inner wall of the reactor 5 is fixedly connected with a plurality of catalyst bed layers 6, the plurality of catalyst bed layers 6 are fixedly connected with a gas distribution plate 7, the pretreated gas enters the reactor 5 through the exhaust port 4 and sequentially passes through the three-layer laminated arrangement of the catalyst bed layers 6 and the gas distribution plate 7; in this process, hydrogen sulfide is captured by the active center on the surface of the catalyst and undergoes an oxidation-reduction reaction to generate elemental sulfur and water vapor, thereby achieving the purpose of desulfurization, the top of the reactor 5 is communicated with an exhaust pipe 8, one end of the exhaust pipe 8 is communicated with a heat exchanger 9, one end of the heat exchanger 9 is communicated with a condensation tower 10, the bottom of the condensation tower 10 is communicated with a liquid discharge pipe 14, one end of the liquid discharge pipe 14 is communicated with a water pump 15, one end of the water pump 15 is communicated with a control valve 16, a spraying assembly is arranged on the inner wall of the condensation tower 10, a filtering mechanism 2 is arranged on the left side of the cyclone separator 3, the spraying assembly comprises a water tank 11, the outer wall of the water tank 11 is fixedly connected to the outer wall right side of the condensation tower 10, the top of the water tank 11 is communicated with a water pipe 12, one end of the water pipe 12 penetrates through the outer wall right side of the condensation tower 10 and is communicated with a spraying device 13, the reacted gas enters the heat exchanger 9, rapidly cools under low-temperature conditions, and then enters the condensation tower 10, the gas is fully contacted with the refrigerant through the spraying device 13, and finally forms a liquid product and is collected to the bottom collection tank, the liquefied natural gas is delivered to a storage tank through the water pump 15, a liquid level meter in the storage tank monitors the liquid level change in real time, and when the set value is exceeded, the discharge program is started to ensure stable operation of the system.

[0040] Specifically, one end of the cyclone separator 3 is provided with an exhaust port 4 for introducing raw gas into the cyclone separator 3 to further remove fine dust therein, and the pretreated gas becomes more pure, which helps to avoid the risk of catalyst poisoning in subsequent processes. The top of the exhaust port 4 is in communication with the reactor 5, and the inner wall of the reactor 5 is uniformly fixedly connected with a plurality of catalyst bed layers 6. The catalyst bed layers 6 are fixedly connected with gas distribution plates 7, forming a layer-by-layer arrangement structure. The pretreated gas enters the reactor 5 through the exhaust port 4 and reacts with the catalyst bed layers 6 and the gas distribution plates 7 in turn; in this process, hydrogen sulfide is captured by the active centers on the surface of the catalyst and undergoes an oxidation-reduction reaction to generate elemental sulfur and water vapor, thereby effectively achieving the purpose of desulfurization. The top of the reactor 5 is in communication with an exhaust pipe 8, one end of the exhaust pipe 8 is in communication with a heat exchanger 9, the other end of the heat exchanger 9 is in communication with a condensation tower 10, the bottom of the condensation tower 10 is provided with a liquid discharge pipe 14, one end of the liquid discharge pipe 14 is in communication with a water pump 15, the other end of the water pump 15 is in communication with a control valve 16, and the inner wall of the condensation tower 10 is provided with a spraying assembly for providing a coolant when the gas passes through. The left side of the cyclone separator 3 is provided with a filtering mechanism 2 for further ensuring the purity of the gas. The spraying assembly includes a water tank 11, the outer wall of which is fixedly connected to the outer wall right side of the condensation tower 10. The top of the water tank 11 is in communication with a water pipe 12, one end of which penetrates the outer wall right side of the condensation tower 10 and is in communication with a spraying device 13. The reacted gas enters the heat exchanger 9 and is rapidly cooled under low temperature conditions, and then enters the condensation tower 10. Through the action of the spraying device 13, the gas is in full contact with the coolant, and finally forms a liquid product and collects in the collection tank at the bottom. The liquefied natural gas is transported to the storage tank by the water pump 15. The liquid level meter in the storage tank monitors the liquid level change in real time. Once the liquid level exceeds the set value, the system will automatically start the discharge program to ensure stable operation of the entire system.

[0041] Referring to Figure 1 , Figure 2 and Figure 4The filtering mechanism 2 comprises a mounting cylinder 201, a right end of the mounting cylinder 201 being communicated with a left end of the cyclone separator 3, a left end of the mounting cylinder 201 being communicated with a residue box 202, the mounting cylinder 201 being used for communicating the cyclone separator 3 with the residue box 202, an inner wall of the mounting cylinder 201 being fixedly connected with a filtering plate 203, a left side of the residue box 202 being fixedly connected with a servo motor 204, an output end of the servo motor 204 penetrating through the left side of the residue box 202 and being fixedly connected with a rotating rod 205, a right end of the rotating rod 205 being fixedly connected with a cleaning brush 206, a top left side of the residue box 202 being communicated with a feeding pipe 207, raw material gas entering the residue box 202 through the feeding pipe 207 and being filtered by the filtering plate 203 to remove larger solid particles, a part of the larger particles falling into an inner bottom of the residue box 202 for storage, and a small part of the particles adhering to a surface of the filtering plate 203, the particles on the surface of the filtering plate 203 being scraped off by starting the servo motor 204 to drive the cleaning brush 206 at the end of the rotating rod 205, a bottom of the residue box 202 being communicated with a residue discharging valve 208, a bottom end of the residue discharging valve 208 being communicated with a residue discharging pipe 209, a bottom end of the cyclone separator 3 being communicated with a collecting box 19, a front side of the collecting box 19 being slidingly connected with a storage box 20, a front side of the storage box 20 being fixedly connected with a handle 21, an outer wall of the handle 21 being fixedly connected with an anti-skid sleeve 22, the residue discharging valve 208 being controlled to be opened regularly, so that the particles flow into the collecting box 19 through the residue discharging pipe 209;

[0042] Specifically, the left end of the mounting cylinder 201 is connected with the slag box 202, which mainly functions as a connecting channel between the cyclone separator 3 and the slag box 202. On the inner wall of the mounting cylinder 201, a filter plate 203 is fixedly installed, which is responsible for intercepting and filtering larger solid particles in the raw material gas. The left side of the slag box 202 is fixedly connected with a servo motor 204. The output end of the servo motor 204 penetrates the left side of the slag box 202 and is firmly connected with a rotating rod 205. The right end of the rotating rod 205 is fixedly connected with a cleaning brush 206 for removing particles attached to the surface of the filter plate 203. The top left side of the slag box 202 is connected with a feed pipe 207 through which the raw material gas enters the inside of the slag box 202. During the filtering process, part of the larger solid particles will fall into the inside bottom of the slag box 202 due to gravity for storage. Meanwhile, a small part of the particles will adhere to the surface of the filter plate 203. In order to remove these adhered particles, the servo motor 204 can be started to drive the cleaning brush 206 at the end of the rotating rod 205 to perform scraping work. The bottom of the slag box 202 is connected with a slag discharge valve 208, and the bottom end of the slag discharge valve 208 is connected with a slag discharge pipe 209, ensuring that the particles can be smoothly discharged from the slag box 202. The bottom end of the cyclone separator 3 is connected with a collection box 19, and the front side of the collection box 19 is slidingly connected with a storage box 20 for collecting and storing the discharged particles. The front side of the storage box 20 is fixedly connected with a handle 21 for easy movement and handling by the operator. The outer wall of the handle 21 is also fixedly connected with a non-slip sleeve 22 to improve the safety and comfort of operation. By regularly controlling the opening of the slag discharge valve 208, the particles can flow into the collection box 19 through the slag discharge pipe 209, thereby completing the entire filtering and collecting process.

[0043] With reference to Figure 1 and Figure 2 , the outer wall of the reactor 5 is fixedly connected with a reinforcing plate 17, and the bottom of the reinforcing plate 17 is fixedly connected with a support column 18 around the periphery. The top left side of the base 1 is fixedly connected with a controller 23, and the top front and rear sides of the base 1 are fixedly connected with a guardrail 26. The periphery of the base 1 is fixedly connected with a connecting plate 24, and the top of each of the plurality of connecting plates 24 is threadedly connected with a bolt 25.

[0044] Specifically, the controller 23 is used to facilitate simple operation control of the entire device, and the support column 18 cooperates with the reinforcing plate 17 to ensure the stability of the reactor 5.

[0045] Working principle: first raw gas into the cyclone separator 3 further remove fine dust, pretreated gas is relatively pure, to avoid the risk of catalyst poisoning in subsequent processes, after pretreatment gas through the exhaust port 4 into the reactor 5, in turn through the catalyst bed 6 and gas distribution plate 7 three layers of stacked arrangement; in this process, hydrogen sulfide is captured by the active center of the catalyst surface and occurs redox reaction with the generation of elemental sulfur and water vapor, so as to achieve the purpose of desulfurization, the gas after the reaction into the heat exchanger 9, under low temperature conditions, rapid cooling, then into the condenser 10, through the spray equipment 13 makes the gas fully contact with the coolant, eventually form liquid products and collection to the bottom of the collection tank, liquefied natural gas through the water pump 15 is delivered to the storage tank, the liquid level meter in the storage tank real-time monitoring of liquid level change, when more than the set value, start the discharge program, ensure the stable operation of the system; and install the cylinder 201 for the communication cyclone separator 3 and slag box 202, raw gas through the feed pipe 207 into the slag box 202 and through the filter plate 203 filter out larger solid particles, a part of the large particles of particles fall into the inside bottom of the slag box 202 for storage, while a small part of the particles adhere to the surface of the filter plate 203, by starting the servo motor 204 drive the end of the cleaning brush 206 of the rod 205 on the surface of the filter plate 203 particles scraping, through the regular control of the discharge valve 208 is opened, so that the particles through the discharge pipe 209 into the collection box 19 in the middle, reduce the cleaning and replacement of the filter plate 203 processing.

[0046] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the foregoing detailed description of the present application, for the person skilled in the art, it still can be modified, or part of the technical features of the equivalent replacement, within the spirit and principles of the present application, any modification, equivalent replacement, improvement, etc., should be included in the scope of protection of the present application.

Claims

1. A liquefied natural gas displacement device comprising a base (1) and a cyclone (3), characterized in that: One end of the cyclone separator (3) is communicated with the exhaust port (4), the top of the exhaust port (4) is communicated with the reactor (5), the inner wall of the reactor (5) is fixedly connected with a plurality of catalyst bed layers (6), a plurality of the catalyst bed layers (6) are fixedly connected with the gas distribution plate (7), the top of the reactor (5) is communicated with the exhaust pipe (8), one end of the exhaust pipe (8) is communicated with the heat exchanger (9), one end of the heat exchanger (9) is communicated with the condensation tower (10), the bottom of the condensation tower (10) is communicated with the liquid discharge pipe (14), one end of the liquid discharge pipe (14) is communicated with the water pump (15), one end of the water pump (15) is communicated with the control valve (16), the inner wall of the condensation tower (10) is provided with a spraying assembly, and the left side of the cyclone separator (3) is provided with a filtering mechanism (2).

2. The LNG displacement device of claim 1, wherein: The filtering mechanism (2) comprises a mounting cylinder (201), the right end of the mounting cylinder (201) is communicated with the left end of the cyclone separator (3), the left end of the mounting cylinder (201) is communicated with a residue accumulation box (202), the inner wall of the mounting cylinder (201) is fixedly connected with a filter plate (203), the left side of the residue accumulation box (202) is fixedly connected with a servo motor (204), the output end of the servo motor (204) penetrates through the left side of the residue accumulation box (202) and is fixedly connected with a rotating rod (205), the right end of the rotating rod (205) is fixedly connected with a cleaning brush (206), the top left side of the residue accumulation box (202) is communicated with a feeding pipe (207), the bottom of the residue accumulation box (202) is communicated with a residue discharge valve (208), and the bottom end of the residue discharge valve (208) is communicated with a residue discharge pipe (209).

3. The LNG displacement device of claim 1, wherein: The spraying assembly comprises a water tank (11), the outer wall of the water tank (11) is fixedly connected to the outer wall right side of the condensation tower (10), the top of the water tank (11) is communicated with a water pipe (12), one end of the water pipe (12) penetrates through the outer wall right side of the condensation tower (10) and is communicated with a spraying device (13).

4. The LNG displacement device of claim 1, wherein: The outer wall of the reactor (5) is fixedly connected with a reinforcing plate (17), and the bottom of the reinforcing plate (17) is fixedly connected with a supporting column (18) around.

5. The LNG displacement device of claim 1, wherein: The bottom end of the cyclone separator (3) is communicated with a collection box (19), and the front side of the collection box (19) is slidingly connected with a storage box (20).

6. The LNG displacement device of claim 5, wherein: The front side of the storage box (20) is fixedly connected with a handle (21), and the outer wall of the handle (21) is fixedly connected with an anti-skid sleeve (22).

7. The LNG displacement device of claim 1, wherein: The top left side of the base (1) is fixedly connected with a controller (23), and the top front and back sides of the base (1) are fixedly connected with guardrails (26).

8. The LNG displacement device of claim 1, wherein: The base (1) is fixedly connected with a connecting plate (24) around, and the top of the plurality of connecting plates (24) is threadedly connected with a bolt (25).

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