Nitrogen drying device suitable for pearlife

Abstract

The utility model relates to the field of pearlife drying, in particular to a nitrogen drying device suitable for pearlife, which comprises a heat preservation box and a heating assembly, a feeding port is arranged at the upper end of the heat preservation box, the lower end of the heat preservation box contracts inwards to form a discharging port, a plurality of heating layers are arranged in the heat preservation box, and each heating layer comprises a plurality of high-temperature nitrogen ejector pipes. A plurality of gas spraying holes are formed in the high-temperature nitrogen gas spraying pipe; the heating assembly comprises a fan and a heater, one end of the fan is connected with nitrogen, the other end of the fan is communicated with the heater, a plurality of heating pieces are arranged in the heater in a staggered mode, the other end of the heater is connected with a plurality of heating pipelines, the heating pipelines correspond to the heating layers one to one, and valves are arranged on the heating pipelines. According to the vacuum storage tank, pearlife is heated and dried through nitrogen, the dryness of the pearlife is guaranteed, and therefore the heat preservation performance of the vacuum storage tank is improved.

Description

Technical Field

[0001] The utility model relates to the field of pearl sand drying, in particular to a nitrogen drying device suitable for pearl sand. Background Art

[0002] In today's society, a large number of cryogenic liquids are used in production and life, such as liquid oxygen O2, liquid nitrogen N2, liquid argon Ar2, liquefied natural gas LNG, etc. Due to the low temperature (about -190℃) characteristics of these liquids, cryogenic containers containing cryogenic liquids must have good low-temperature insulation performance. The low-temperature insulation of fixed cryogenic liquid storage tanks mainly relies on the insulation material filled in the interlayer (vacuum) - expanded perlite (pearl sand). Among them, the moisture content of the insulation material plays a decisive role in the use effect and life of this type of container.

[0003] The internal structure of expanded perlite (pearlescent sand) particles is honeycomb-shaped, and it is difficult to completely remove impurities such as water and air. These impurities will continue to volatilize and release in the vacuum environment of the interlayer, destroying the vacuum degree of the interlayer. Expanded perlite (pearlescent sand) containing water has poor fluidity and is prone to produce holes during the filling process. These holes will make it easier for heat to transfer through the interlayer, making it impossible for the storage tank to fill the entire interlayer, thereby reducing the thermal insulation performance of the storage tank.

[0004] Based on the above problems, the vacuum tank may sweat, frost on the surface, deteriorate insulation performance, increase the evaporation rate of the tank, etc. The vacuum degree of the interlayer will gradually decrease until the tank cannot be used. Summary of the invention

[0005] In order to solve the problems that after the vacuum storage tank is filled with pearlescent sand particles containing moisture, the surface will sweat, frost, the insulation performance will deteriorate, the evaporation rate of the storage tank will increase, etc., the utility model proposes a nitrogen drying device suitable for pearlescent sand, which heats and dries the pearlescent sand by nitrogen, thereby ensuring the dryness of the pearlescent sand and improving the thermal insulation performance of the vacuum storage tank.

[0006] In order to achieve the above purpose, the technical solution of the utility model is:

[0007] A nitrogen drying device suitable for pearlescent sand comprises an insulation box and a heating assembly, wherein the upper end of the insulation box is provided with a feeding port, the lower end of the insulation box is contracted inwardly to form a discharge port, a plurality of heating layers are arranged inside the insulation box, each of the heating layers comprises a plurality of high-temperature nitrogen gas jet pipes, and a plurality of gas jet ports are arranged on the high-temperature nitrogen gas jet pipes;

[0008] The heating component includes a fan and a heater, one end of the fan is connected to nitrogen, and the other end of the fan is connected to the heater. A plurality of heating elements are arranged alternately inside the heater, and a plurality of heating pipes are connected to the other end of the heater. The plurality of heating pipes correspond to the plurality of heating layers one by one, and valves are arranged on the heating pipes.

[0009] Furthermore, a plurality of the heating layers are arranged at intervals inside the heat preservation box, and the heating layer located at the discharge port has a conical structure.

[0010] Furthermore, the thermal insulation box includes an outer shell and an inner tube, and an insulation layer is provided between the outer shell and the inner tube to reduce the high temperature in the thermal insulation box from being conducted outwardly.

[0011] Furthermore, a brass mesh is arranged on the outside of the high-temperature nitrogen gas jet pipe, and the brass mesh is arranged in two layers to prevent pearl sand from entering the jet pipe from the jet port and causing blockage.

[0012] Furthermore, the insulation box is provided with a plurality of feeding ports, each of which is provided with a cover plate. After drying is completed, the pearlescent sand in the insulation box is preserved by closing the cover plate.

[0013] Furthermore, the discharge port is externally connected to a discharge pipe, and a discharge valve is provided on the discharge pipe.

[0014] Furthermore, a bracket is arranged on the outside of the insulated box.

[0015] Through the above technical solution, the beneficial effects of the utility model are:

[0016] The utility model heats nitrogen through a heating component, and then heats and dries the pearlescent sand in the insulation box through a high-temperature nitrogen jet pipe. The moisture content of the pearlescent sand after nitrogen drying is less than 0.3%, and the additional layer filled into the vacuum storage tank can improve the thermal insulation performance of the vacuum storage tank.

[0017] The utility model heats nitrogen through a heater, and the nitrogen is used to heat and dry the pearlescent sand. The pearlescent sand is protected by nitrogen throughout the whole process, and the vacuum degree of the storage tank can be guaranteed.

[0018] The utility model provides a heat preservation box, a cover plate, a discharge valve and other structures. After the pearlescent sand is dried, the cover plate can be closed to continuously store the dried pearlescent sand in the heat preservation box, so that the pearlescent sand can be prepared in advance and used whenever needed, which is more convenient. In addition, the utility model can directly discharge the pearlescent sand into a designated position through a discharge pipe, and the pearlescent sand will not be exposed to the air, thereby avoiding secondary contamination of the pearlescent sand. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the whole nitrogen drying device suitable for pearlescent sand of the utility model;

[0020] Figure 2 The utility model is a nitrogen drying device suitable for pearl sand Figure 1 The enlarged schematic diagram of point A in the middle;

[0021] Figure 3 The utility model is a nitrogen drying device suitable for pearl sand Figure 1 The enlarged schematic diagram of point B in the middle;

[0022] Figure 4 The utility model is a schematic diagram of a heating component in a nitrogen drying device suitable for pearlescent sand.

[0023] The reference numerals in the accompanying drawings are:

[0024] 1 is an insulation box, 101 is an outer shell, 102 is an inner tube, 103 is an insulation layer, 2 is a feeding port, 3 is a cover plate, 4 is a high-temperature nitrogen jet pipe, 5 is a jet port, 6 is a fan, 7 is a heater, 8 is a heating element, 9 is a heating pipeline, 10 is a valve, 11 is a discharge pipeline, 12 is a discharge valve, and 13 is a bracket. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments:

[0026] In the description of the present invention, it should be understood that the terms "left", "right", "up", "down", "horizontal", "vertical" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] Embodiment 1

[0028] like Figure 1 to Figure 4 As shown, a nitrogen drying device suitable for pearlescent sand comprises an insulation box 1 and a heating assembly, wherein the upper end of the insulation box 1 is provided with a feeding port 2, and the lower end of the insulation box 1 contracts inwardly to form a discharge port, and a plurality of heating layers are arranged inside the insulation box 1, wherein each of the heating layers comprises a plurality of high-temperature nitrogen gas jet pipes 4, and a plurality of gas jet ports 5 are arranged on the high-temperature nitrogen gas jet pipes 4;

[0029] The heating assembly includes a fan 6 and a heater 7. One end of the fan 6 is connected to nitrogen, and the other end of the fan 6 is connected to the heater 7. A plurality of heating elements 8 are arranged alternately inside the heater 7. The other end of the heater 7 is connected to a plurality of heating pipes 9. The plurality of heating pipes 9 correspond to the plurality of heating layers one by one, and valves 10 are arranged on the heating pipes 9.

[0030] In addition, a plurality of the heating layers are arranged at intervals inside the insulation box 1, and the heating layer located at the discharge port has a conical structure. The volume of the insulation box 1 is 80m³, and the heating layers in the insulation box 1 are arranged in three layers. Two rows of the high-temperature nitrogen jet pipes 4 are arranged in each heating layer, and the distance between two adjacent jet ports 5 on the high-temperature nitrogen jet pipe 4 is 100mm×100mm, so as to ensure the heating and drying effect of the pearl sand.

[0031] Specifically, the thermal insulation box 1 includes an outer shell 101 and an inner tube 102, an insulation layer 103 is provided between the outer shell 101 and the inner tube 102, and the insulation distance between the outer shell 101 and the inner tube 102 is 250 mm to reduce the high temperature in the thermal insulation box 1 from being conducted outward.

[0032] In this embodiment, a brass mesh is arranged outside the high-temperature nitrogen gas jet pipe 4. The brass mesh is arranged in two layers. The specification of the brass mesh is 200 meshes to prevent pearl sand from entering the jet pipe from the jet port 5 and causing blockage.

[0033] In this embodiment, a plurality of feeding ports 2 are provided on the insulation box 1, and a cover plate 3 is provided at each of the feeding ports 2 of the insulation box 1. After drying is completed, the pearlescent sand in the insulation box 1 can be preserved by closing the cover plate 3, so that the pearlescent sand can be prepared in advance and used whenever needed, which is more convenient.

[0034] In this embodiment, the discharge port is externally connected to a discharge pipe 11, and a discharge valve 12 is provided on the discharge pipe 11. When discharging, the discharge valve 12 is opened, and the pearlescent sand is sucked into the interlayer of the vacuum storage tank through a negative pressure pump, so that the pearlescent sand will not be exposed to the air, thereby avoiding secondary contamination of the pearlescent sand.

[0035] In this embodiment, a bracket 13 is provided on the outside of the heat preservation box 1 to facilitate the installation of the discharge pipe 11 and facilitate the discharge of materials.

[0036] It is worth mentioning that in this application, the fan 6 is a blower, and the parameters of the fan 6 are: motor voltage: ~380V, power: 1.0KW, blower outlet pressure is 3Kpa, flow rate: 5~10m³ / min, actual control flow rate: 1.5 m³ / min; the heater 7 is an electric heater, and the parameters of the heater 7 are: electric heating tube voltage: ~380V, power: 20KW, automatic temperature control: 0~260℃, and the actual temperature is automatically controlled to 150℃±1℃.

[0037] Please refer to the actual application Figure 1 to Figure 4 When drying pearl sand: first close the discharge valve 12, fill the pearl sand into the insulation box 1, then open the valve 10, start the blower 6, and send the vaporized room temperature nitrogen into the heater 7 for heating. The room temperature nitrogen is heated by refractory heating in the heater 7 to increase the temperature to 150℃±1℃.

[0038] Open valve 10, and spray 150℃±1℃ high-temperature nitrogen into the pearlescent sand from the jet port 5. After 12 hours of continuous high-temperature flowing nitrogen heating and baking at 150℃±1℃, the impurities such as water and air on the surface of the pearlescent sand and hidden in the honeycombs inside the pearlescent sand particles are gradually vaporized and taken out from the feeding port 2 at the top of the box. The moisture content of the dried pearlescent sand is less than 0.2% as tested by a moisture meter, which is better than the moisture content requirement of less than 0.3% in the national standard GB / T18442.2-2019;

[0039] After the drying is completed, the cover plate 3, the valve 10, the blower 6 and the heater 7 are closed, and the pearlescent sand is stored in the heat preservation box 1 so that it can be taken out at any time;

[0040] When taking pearl sand, use a stainless steel corrugated hose to connect the discharge pipe 11 at the bottom of the insulation box 1 to the interlayer of the vacuum storage tank, and open the pearl sand outlet valve 10. Turn on the negative pressure pump connected to the other end of the interlayer of the vacuum storage tank to suck the pearl sand into the interlayer of the vacuum storage tank. In order to prevent the secondary contamination of the pearl sand by impurities such as moisture and air, nitrogen is blown in from the nitrogen inlet of the pearl sand insulation box 1 at the same time. The nitrogen flow rate is appropriately adjusted according to the amount of pearl sand sucked by the negative pressure pump to ensure that the pearl sand is always in a nitrogen-protected environment during the process of loading into the interlayer of the vacuum storage tank. In the later stage, during the vacuum evacuation process of the interlayer of the vacuum storage tank, a qualified interlayer vacuum degree can be drawn in a shorter time and the vacuum degree can be maintained for a long time without decreasing, which extends the use and maintenance cycle of the vacuum storage tank.

[0041] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structures, features and principles described in the patent scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. A nitrogen drying device suitable for pearlescent sand, characterized in that: The invention comprises a heat preservation box (1) and a heating assembly, wherein the upper end of the heat preservation box (1) is provided with a feeding port (2), the lower end of the heat preservation box (1) is contracted inwardly to form a discharge port, a plurality of heating layers are provided inside the heat preservation box (1), each of the heating layers comprises a plurality of high-temperature nitrogen gas jet pipes (4), and a plurality of jet ports (5) are provided on the high-temperature nitrogen gas jet pipes (4); The heating assembly comprises a fan (6) and a heater (7), one end of the fan (6) is connected to nitrogen, and the other end of the fan (6) is connected to the heater (7), a plurality of heating elements (8) are arranged in an interlaced manner inside the heater (7), and the other end of the heater (7) is connected to a plurality of heating pipes (9), the plurality of heating pipes (9) correspond to the plurality of heating layers one by one, and a valve (10) is arranged on each of the heating pipes (9).

2. A nitrogen drying device suitable for pearlescent sand according to claim 1, characterized in that: The plurality of heating layers are arranged at intervals inside the heat preservation box (1), and the heating layer located at the discharge port has a conical structure.

3. A nitrogen drying device suitable for pearlescent sand according to claim 1, characterized in that: The heat preservation box (1) comprises an outer shell (101) and an inner cylinder (102), and a heat preservation layer (103) is provided between the outer shell (101) and the inner cylinder (102).

4. A nitrogen drying device suitable for pearlescent sand according to claim 1, characterized in that: A brass mesh is arranged on the outside of the high-temperature nitrogen gas jet pipe (4).

5. A nitrogen drying device suitable for pearlescent sand according to claim 1, characterized in that: The heat preservation box (1) is provided with a plurality of feeding ports (2), and each of the feeding ports (2) of the heat preservation box (1) is provided with a cover plate (3).

6. A nitrogen drying device suitable for pearlescent sand according to claim 1, characterized in that: The discharge port is externally connected to a discharge pipe (11), and a discharge valve (12) is provided on the discharge pipe (11).

7. A nitrogen drying device suitable for pearlescent sand according to claim 1, characterized in that: A bracket (13) is arranged on the outside of the heat preservation box (1).

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