Liquid nitrogen gasifier cold energy recovery device and system

Abstract

The utility model discloses a liquid nitrogen vaporizer cold energy recovery device which comprises an external heat exchange unit and at least one internal heat exchange unit, the internal heat exchange unit is configured to be installed between two oppositely-arranged fins of a liquid nitrogen vaporizer, and the external heat exchange unit is configured to be installed on the outer side of the liquid nitrogen vaporizer. The utility model further discloses a liquid nitrogen gasifier cold energy recovery system. Through the design, the liquid nitrogen gasification cold energy utilization rate can be increased, and the heat exchange efficiency is improved; and the internal heat exchange unit and the external heat exchange unit are independently arranged, so that installation and subsequent maintenance are facilitated.

Description

Technical Field

[0001] The utility model relates to the field of cold energy recovery of equipment, in particular to a cold energy recovery device and system for a liquid nitrogen vaporizer. Background Art

[0002] A large amount of cold energy is generated during the vaporization of liquid nitrogen. Due to the complex structure of the liquid nitrogen vaporizer, the existing cold energy recovery of the liquid nitrogen vaporizer usually adopts spray type or water tank type heat exchange, and conducts contact heat exchange with the liquid nitrogen vaporizer through spraying or overall immersion. However, in spray type heat exchange, dust in the air will enter the water, and mineral deposits will adhere to the vaporizer after long-term use, causing fouling of the vaporizer. This will not only affect the heat exchange effect, but also cause impurity pollution; long-term use of water tank type heat exchange will cause ionization corrosion of the vaporizer and is inconvenient for maintenance.

[0003] Although the non-contact heat exchange device has a longer service life than the contact heat exchange device, due to its small heat exchange area, the heat exchange efficiency is low. Summary of the Utility Model

[0004] Objectives of the Utility Model: The objective of the utility model is to provide a cold energy recovery device for a liquid nitrogen vaporizer that can improve the non-contact heat exchange efficiency; another objective of the utility model is to provide a cold energy recovery system for a liquid nitrogen vaporizer that can improve the utilization rate of the cold energy of liquid nitrogen vapor.

[0005] Technical Solution: The cold energy recovery device for a liquid nitrogen vaporizer described in the utility model includes an external heat exchange unit and an internal heat exchange unit. The internal heat exchange unit is configured to be installed between two relatively arranged fins of the liquid nitrogen vaporizer, and the external heat exchange unit is configured to be installed outside the liquid nitrogen vaporizer.

[0006] The liquid nitrogen vaporizer has a plurality of fins arranged in a zigzag pattern. The above-mentioned cold energy recovery device for a liquid nitrogen vaporizer fully considers the complex structure of the liquid nitrogen vaporizer, and conducts non-contact heat exchange with the fins of the liquid nitrogen vaporizer from the inside by setting the internal heat exchange unit, and conducts non-contact heat exchange with the fins of the liquid nitrogen vaporizer from the outside by setting the external heat exchange unit, so as to make full use of all the heat exchange surfaces of the liquid nitrogen vaporizer and improve the heat exchange efficiency; moreover, the internal heat exchange unit and the external heat exchange unit are independently arranged, which is convenient for installation and subsequent maintenance.

[0007] The internal heat exchange unit includes a film distribution type heat exchanger communicating with each other and a first serpentine tube spirally wound outside the film distribution type heat exchanger. The film distribution type heat exchanger includes a plurality of heat exchange vertical tubes, which can effectively increase the heat exchange area. The first serpentine tube is wound around the periphery of the film distribution type heat exchanger, which is beneficial to further increase the heat exchange area and improve the heat exchange efficiency.

[0008] The inlet of the first serpentine tube is connected to the hot water main pipe, the outlet of the first serpentine tube is connected to the inlet of the film-type heat exchanger, and the outlet of the film-type heat exchanger is connected to the cold water main pipe. After the hot water enters the first serpentine tube, it exchanges heat with the fins of the liquid nitrogen vaporizer on the periphery of the film-type heat exchanger, absorbs the cold energy of the liquid nitrogen vaporizer, and realizes preliminary cooling; subsequently, the preliminarily cooled hot water enters the film-type heat exchanger to absorb the cold energy generated by the liquid nitrogen vaporizer for secondary heat exchange, and the generated cold water finally flows into the cold water main pipe through it.

[0009] The external heat exchange unit includes a hot water header pipe and a cold water header pipe arranged in parallel. Along the extension direction of the hot water header pipe, a plurality of second serpentine tubes are arranged side by side; the inlets and outlets of the second serpentine tubes are respectively connected to the hot water header pipe and the cold water header pipe; the hot water header pipe and the cold water header pipe are respectively connected to the hot water main pipe and the cold water main pipe. The serpentine tube itself can increase its own heat exchange area. By arranging multiple serpentine tubes and assembling them through the header pipe, the heat exchange area of the external heat exchange unit can be further increased; and the above structure can integrate each component of the external heat exchange unit as a whole, facilitating the installation and maintenance of the external heat exchange unit.

[0010] A plurality of internal heat exchange units are evenly distributed, and the four external heat exchange units are respectively arranged around the liquid nitrogen vaporizer. By fully arranging the internal heat exchange units between the fins of the liquid nitrogen vaporizer and surrounding the external heat exchange units around the liquid nitrogen vaporizer, the heat exchange area available for the liquid nitrogen vaporizer can be fully utilized, and the heat exchange efficiency of the cold energy recovery device of the liquid nitrogen vaporizer can be improved.

[0011] The cold energy recovery device of the liquid nitrogen vaporizer includes a heat insulation support, and the external heat exchange unit is embedded and installed in the heat insulation support. The material of the heat insulation support can be selected as polyurethane foam material. The heat insulation support can not only fix the position of the external heat exchange unit, but also effectively reduce the loss of cold energy.

[0012] The cold energy recovery system of the liquid nitrogen vaporizer described in the present utility model includes the above-mentioned cold energy recovery device of the liquid nitrogen vaporizer, and also includes a liquid nitrogen vaporizer, a seal cooling device for a sand mill, and a seal cooling device for a homogenizing pump. The water outlets and water inlets of the seal cooling device for the sand mill and the seal cooling device for the homogenizing pump are respectively connected to the hot water main pipe and the cold water main pipe of the cold energy recovery device of the liquid nitrogen vaporizer.

[0013] The seals of the sand mill and the homogenizing pump need to be cooled by a cooling device. Through the cold energy recovery device of the liquid nitrogen vaporizer, the cooling water at the outlet of the cooling device can be exchanged with the liquid nitrogen vaporizer, and the cooling water can be re-cooled and then input into the seal cooling devices of the sand mill and the homogenizing pump again to realize the recycling of the system energy.

[0014] The cold energy recovery system of the liquid nitrogen vaporizer further includes a controller, a temperature sensor, and an electronic throttle valve that are electrically connected. The controller adjusts the opening degree of the electronic throttle valve according to the outlet water temperature of the main cold water pipe detected by the temperature sensor.

[0015] Beneficial effects: Compared with the prior art, the utility model has the following advantages: 1. The internal heat exchange unit and the external heat exchange unit are respectively located on both sides of the fins of the liquid nitrogen vaporizer, with a large heat exchange area and high heat exchange efficiency. While fully vaporizing the liquid nitrogen, it can make full use of the cold energy of the liquid nitrogen vaporizer to cool the cooling water; 2. The non-contact heat exchange can extend the service life of the cold energy recovery device of the liquid nitrogen vaporizer; 3. The internal heat exchange unit and the external heat exchange unit are separately arranged, which is convenient for installation and maintenance. Brief Description of the Drawings

[0016] Figure 1 is a structural schematic diagram of the device of the utility model;

[0017] Figure 2 is a top view of the device of the utility model;

[0018] Figure 3 is a structural schematic diagram of the internal heat exchange unit;

[0019] Figure 4 is a structural schematic diagram of the second serpentine tube;

[0020] Figure 5 is a structural schematic diagram of the hot water manifold. Detailed Embodiment

[0021] The technical solution of the utility model will be further described below with reference to the drawings.

[0022] As Figure 1 and Figure 2 shown, the cold energy recovery device of the liquid nitrogen vaporizer described in the utility model includes four external heat exchange units 1, four internal heat exchange units 2, and a heat insulation bracket (not shown in the figure). The fins of the liquid nitrogen vaporizer 3 are arranged in an S shape, thus forming two accommodation gaps. Two internal heat exchange units 2 are arranged in each accommodation gap. The four external heat exchange units 1 are respectively installed around the liquid nitrogen vaporizer 3 and enclose the liquid nitrogen vaporizer 3 and the internal heat exchange units 2.

[0023] As Figure 3As shown in the figure, the internal heat exchange unit 2 includes a film-distributing heat exchanger 21 that is interconnected, and a first serpentine tube 22 that is spirally wound around the outside of the film-distributing heat exchanger 21. The inlet of the first serpentine tube 22 is connected to the hot water main pipe. The outlet of the first serpentine tube 22 is connected to the inlet of the film-distributing heat exchanger 21 through a connecting head. The outlet of the film-distributing heat exchanger 21 is connected to the cold water main pipe through a hose. After the hot water enters the first serpentine tube 22, it exchanges heat with the fins of the liquid nitrogen vaporizer 3 on the periphery of the film-distributing heat exchanger 21, absorbs the cold energy of the liquid nitrogen vaporizer 3, and realizes preliminary cooling. Subsequently, the preliminarily cooled hot water enters the film-distributing heat exchanger 21 to absorb the cold energy generated by the liquid nitrogen vaporizer 3 for secondary heat exchange. The generated cold water finally flows into the cold water main pipe. The four internal heat exchange units 2 are independent of each other.

[0024] As Figure 1 , Figure 2 and Figure 5 shown in the figure, the external heat exchange unit 1 includes a hot water header pipe 11 and a cold water header pipe 12 arranged in parallel. Along the extension direction of the hot water header pipe 11, the second serpentine tubes 13 are arranged side by side in sequence. The inlets and outlets of the second serpentine tubes 13 are correspondingly connected to the interfaces on the hot water header pipe 11 and the cold water header pipe 12. The inlet of the hot water header pipe 11 and the outlet of the cold water header pipe 12 are respectively connected to the hot water main pipe and the cold water main pipe. The external heat exchange unit 1 is embedded and installed in a heat insulation bracket. The heat insulation bracket is made of polyurethane foam material, and the thickness of the heat insulation bracket is 50 millimeters.

[0025] The liquid nitrogen vaporizer cold energy recovery system described in the present utility model includes a liquid nitrogen vaporizer cold energy recovery device, a liquid nitrogen vaporizer 3, a sand mill mechanical seal cooling device, a homogenizing pump mechanical seal cooling device, and a controller, a temperature sensor, and an electronic throttle valve that are electrically connected. The water outlets and water inlets of the sand mill mechanical seal cooling device and the homogenizing pump mechanical seal cooling device are respectively connected to the hot water main pipe and the cold water main pipe of the liquid nitrogen vaporizer cold energy recovery device. The liquid nitrogen vaporizer cold energy recovery device can exchange heat between the cooling water at the outlet of the sand mill mechanical seal cooling device and the homogenizing pump mechanical seal cooling device and the liquid nitrogen vaporizer 3, re-cool the cooling water, and then input it into the mechanical seal cooling devices of the sand mill and the homogenizing pump again, thereby realizing the recovery and utilization of the system energy. The controller can adjust the opening degree of the electronic throttle valve according to the outlet water temperature of the cold water main pipe detected by the temperature sensor.

[0026] The above-mentioned pipe fittings such as the first serpentine tube 22 and the second serpentine tube 13 are made of stainless steel. The liquid nitrogen vaporizer cold energy recovery system further includes a pure water tank. The cold water main pipe is connected to the pure water tank, and the cold water recovered by the liquid nitrogen vaporizer cold energy recovery device is temporarily stored in the pure water tank. The outlet of the pure water tank is connected to the inlets of the sand mill mechanical seal cooling device and the homogenizing pump mechanical seal cooling device to cool the mechanical seals of the sand mill and the homogenizing pump.

Claims

1. A liquid nitrogen gasifier cold energy recovery device, characterized in that: The invention comprises an external heat exchange unit (1) and an internal heat exchange unit (2), wherein the internal heat exchange unit (2) is configured to be installed between two fins of a liquid nitrogen vaporizer (3) which are arranged opposite to each other, and the external heat exchange unit (1) is configured to be installed on the outside of the liquid nitrogen vaporizer (3).

2. The cold energy recovery device for liquid nitrogen gasifier according to claim 1, characterized in that: The internal heat exchange unit (2) comprises interconnected film heat exchangers (21) and a first serpentine tube (22) spirally wound around the outside of the film heat exchanger.

3. The cold energy recovery device for liquid nitrogen gasifier according to claim 2, characterized in that: The inlet of the first serpentine tube (22) is connected to the hot water main, the outlet of the first serpentine tube (22) is connected to the inlet of the film heat exchanger (21), and the outlet of the film heat exchanger (21) is connected to the cold water main.

4. The cold energy recovery device for liquid nitrogen gasifier according to claim 1, characterized in that: The external heat exchange unit (1) comprises a hot water cluster tube (11) and a cold water cluster tube (12) arranged in parallel, and a plurality of second serpentine tubes (13) are arranged side by side along the extension direction of the hot water cluster tube (11); an inlet and an outlet of the second serpentine tube (13) are respectively connected to the hot water cluster tube (11) and the cold water cluster tube (12); the hot water cluster tube (11) and the cold water cluster tube (12) are respectively connected to a hot water main pipe and a cold water main pipe.

5. The cold energy recovery device of the liquid nitrogen gasifier (3) according to claim 1, characterized in that: The plurality of internal heat exchange units (2) are evenly distributed, and the four external heat exchange units (1) are respectively arranged around the liquid nitrogen gasifier (3).

6. The cold energy recovery device of the liquid nitrogen gasifier (3) according to claim 1, characterized in that: It comprises a heat insulation bracket, in which the external heat exchange unit (1) is embedded and installed.

7. A liquid nitrogen vaporizer cold energy recovery system, comprising the liquid nitrogen vaporizer (3) cold energy recovery device according to any one of claims 1 to 6, characterized in that: It also comprises a liquid nitrogen gasifier (3), a sand mill seal cooling device and a homogenizing pump seal cooling device, wherein the water outlet and water inlet of the sand mill seal cooling device and the homogenizing pump seal cooling device are respectively connected to the hot water main pipe and the cold water main pipe of the cold energy recovery device of the liquid nitrogen gasifier (3).

8. The cold energy recovery system for a liquid nitrogen vaporizer according to claim 7, characterized in that: It also includes an electrically connected controller, a temperature sensor and an electronic throttle valve, wherein the controller adjusts the opening of the electronic throttle valve according to the outlet water temperature of the cold water main pipe detected by the temperature sensor.

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