A low temperature raffinate treatment device

Abstract

This invention belongs to the technical field of low-temperature residual liquid treatment devices, specifically disclosing a low-temperature residual liquid treatment device. It includes an open-topped cylinder connected to a heating pipe, placed in a pit. An annular cavity is located at the top of the cylinder, connected to an inlet pipe that connects the cylinder to the annular cavity. Several fixed plates are inclinedly arranged within the annular cavity, which has inlet holes and ventilation holes. The inlet holes are located above the fixed plates. A driving device is connected to the annular cavity to drive its rotation. This invention performs a first treatment on the residual liquid through the annular cavity, evaporating most of it. The remaining residual liquid then flows back into the cylinder for a second treatment. This dual treatment improves efficiency, and the coldness of the residual liquid is locked inside the cylinder, completely isolated from the civil engineering foundation, preventing the diffusion of coldness and adverse effects on the surrounding civil engineering foundation, thus ensuring the safety of surrounding personnel and equipment.

Description

Technical Field

[0001] This invention relates to the field of cryogenic residual liquid treatment devices, and more specifically, to a cryogenic residual liquid treatment device. Background Technology

[0002] During operation, air separation units need to discharge small amounts of cryogenic liquids, such as liquid nitrogen and liquid oxygen, at temperatures generally around -180°C. These sources include pre-cooling of cryogenic liquid pumps, pre-cooling of liquid pipelines, discharge of substandard waste liquids, and discharge from the safety valves of cryogenic liquid units. Such small, discontinuous discharges of cryogenic liquids are generally collected from various discharge outlets and directed to the cryogenic residual liquid treatment unit.

[0003] Common cryogenic residual liquid treatment devices involve draining the cryogenic liquid into a cylinder placed in a pit, and then introducing air or nitrogen to make it evaporate. However, the residual liquid accumulates inside the cylinder, and the limited space results in low evaporation efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a low-temperature residual liquid treatment device, which aims to solve the technical problem of low evaporation efficiency of residual liquid when it accumulates in the cylinder during the treatment of residual liquid in existing treatment devices.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] A low-temperature residual liquid treatment device includes an open cylindrical body connected to a heating pipe. The cylindrical body is placed in a pit. An annular cavity is provided at the top of the cylindrical body. An inlet pipe is connected to the annular cavity, which connects the cylindrical body and the annular cavity. Several fixed plates are inclinedly arranged inside the annular cavity. An inlet hole and a ventilation hole are provided on the annular cavity. The inlet hole is located above the fixed plate. A drive device is connected to the annular cavity to drive its rotation.

[0007] Preferably, the cylinder includes an inner cylinder and an outer cylinder, which form an insulated space. The interlayer between the inner and outer cylinders is filled with perlite, the inner cylinder is filled with pebbles, and the outer cylinder is connected to a vacuum device.

[0008] Preferably, a temperature probe is installed inside the inner cylinder.

[0009] Preferably, the bottom of the outer cylinder is provided with several support frames, which are detachably connected to the foundation at the bottom of the pit.

[0010] Preferably, a cofferdam is set up around the pit.

[0011] Preferably, the drive device includes a motor, the motor is connected to a gear, the gear meshes with a rack, and the rack is disposed outside the annular cavity.

[0012] Preferably, at least two heating elements are provided.

[0013] Preferably, an umbrella-shaped air-collecting cavity is provided on the annular cavity.

[0014] The technical solution of the present invention has at least the following beneficial effects:

[0015] This invention includes an open-top cylindrical body connected to a heating pipe. The cylindrical body is placed in a pit, and an annular cavity is provided at the top of the cylindrical body. The annular cavity is connected to a liquid inlet pipe, which connects the cylindrical body and the annular cavity. Several fixed plates are inclinedly arranged inside the annular cavity. The annular cavity has a liquid inlet hole and a ventilation hole. The liquid inlet hole is located above the fixed plate. The annular cavity is connected to a driving device that drives it to rotate. The rotation of the annular cavity treats the residual liquid, increases the contact area with air, and the residual liquid evaporates rapidly. The remaining residual liquid flows in a diffuse manner to the cylindrical body for a second treatment process. This dual treatment results in higher evaporation efficiency of the residual liquid. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the unfolded annular cavity of the present invention;

[0018] Figure 3 This is a top view of the annular cavity of the present invention.

[0019] Icons: 1-Cylinder; 101-Inner cylinder; 102-Outer cylinder; 2-Perlite; 3-Support frame; 4-Pit; 5-Annular cavity; 6-Pebbles; 7-Dyke; 8-Motor; 9-Inlet pipe; 10-Heating pipe; 11-Fixing plate; 12-Temperature probe; 13-Ventilation hole; 14-Air collection chamber; 15-Inlet hole. Detailed Implementation

[0020] Example

[0021] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0022] The following is combined Figures 1-3 The present invention will be described in detail below.

[0023] The arrow points in the direction of gas flow.

[0024] A cryogenic residual liquid treatment device includes an open-type cylindrical body 1, with heating pipes 10 connected to the cylindrical body 1. At least two heating pipes 10 are provided. The cylindrical body 1 is placed in a pit 4. An annular cavity 5 is provided at the top of the cylindrical body 1. An inlet pipe 9 is connected to the annular cavity 5. One end of the inlet pipe 9 is connected to the cryogenic residual liquid discharge pipe (not shown in the figure) of an air separation unit, and the other end connects the cylindrical body 1 and the annular cavity 5. Several fixed plates 11 are inclinedly arranged inside the annular cavity 5. The fixed plates 11 are wavy and have small holes. An inlet hole 15 and a ventilation hole 13 are provided on the annular cavity 5. The inlet hole 15 is located... Above the fixed plate 11, the annular cavity 5 is connected to a drive device that drives its rotation. The drive device includes a motor 8, and the output shaft of the motor 8 is connected to a gear. The gear meshes with a rack, which is located outside the annular cavity 5. The residual liquid flows from the inverted L-shaped inlet pipe 9 to the top of the annular cavity 5, and then drips from the inlet hole 15 onto the fixed plate 11. When the motor 8 is started, the annular cavity 5 rotates around the cylinder 1 as the axis (the inverted L-shaped inlet pipe 9 does not rotate with it). Air enters from the ventilation hole 13 and reacts with the residual liquid on the fixed plate 11. The contact area with the air is larger, and the residual liquid evaporates faster.

[0025] The cylinder 1 includes an inner cylinder 101 and an outer cylinder 102, which form an insulating space. The interlayer between the inner cylinder 101 and the outer cylinder 102 is filled with perlite 2. The inner cylinder 101 is filled with pebbles 6. The outer cylinder 102 is connected to a vacuum pump (not shown in the figure). The insulation method adopts powder vacuum technology. After the interlayer is evacuated, it can achieve the function of heat insulation. The residual liquid after being treated by the annular cavity 5 falls into the inner cylinder 101 in a divergent manner from the liquid inlet pipe 9. The inlet of the heating pipe 10 is connected to a dry heating gas source (not shown in the figure). Air or nitrogen is introduced at the same time as the residual liquid enters the inner cylinder 101. The gas is introduced from the bottom of the heating pipe 10 and flows upward. It contacts the low temperature liquid on the pebbles 6 for heat exchange, which accelerates the exchange rate with the residual liquid on the pebbles 6. The residual liquid is treated twice to improve efficiency.

[0026] An umbrella-shaped air collection chamber 14 is provided on the annular cavity 5. The gas evaporated in the annular cavity 5 and the inner cylinder 101 is discharged to the outside atmosphere through the air collection chamber 14.

[0027] A temperature probe 12 is installed inside the inner cylinder 101. If the discharge volume is too large, the liquid level will rise to the temperature probe 12 and the temperature will drop rapidly. After triggering the low temperature alarm, an alarm will be issued. The operator can reduce or stop the discharge of residual liquid and cut off the discharge of residual liquid in time to prevent residual liquid from overflowing out of the cylinder 1 and freezing the foundation of the pit 4.

[0028] The bottom of the outer cylinder 1 is equipped with several support frames 3. The support frames 3 are detachably connected to the foundation at the bottom of the pit 4. The support frames 3 are inclined and fixed to the foundation at the bottom of the pit by anchor bolts. The residual liquid evaporates directly inside the cylinder 1, and the cold energy is locked inside the cylinder 1. The cylinder 1 does not contact the surrounding area or the ground and is completely isolated from the civil foundation to avoid the diffusion of cold energy from causing adverse effects on the surrounding civil foundation and to ensure the safety of surrounding personnel and equipment.

[0029] A dike 7 is set up around the pit 4 to prevent water or debris from entering the pit 4.

[0030] The above-described embodiments are merely illustrative of specific implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A low-temperature residual liquid treatment device, comprising an open-type cylindrical body (1), wherein the cylindrical body (1) is connected to a heating pipe (10), and the cylindrical body (1) is placed in a pit (4), characterized in that: The top of the cylinder (1) is provided with an annular cavity (5), the annular cavity (5) is connected to a liquid inlet pipe (9), the liquid inlet pipe (9) connects the cylinder (1) and the annular cavity (5), a number of fixed plates (11) are inclinedly arranged inside the annular cavity (5), the annular cavity (5) is provided with a liquid inlet hole (15) and a ventilation hole (13), the liquid inlet hole (15) is located above the fixed plate (11), and the annular cavity (5) is connected to a driving device that drives it to rotate; The cylinder (1) includes an inner cylinder (101) and an outer cylinder (102), the inner cylinder (101) and the outer cylinder (102) form an insulated space, the interlayer between the inner cylinder (101) and the outer cylinder (102) is filled with perlite (2), the inner cylinder (101) is filled with pebbles (6), and the outer cylinder (102) is connected to a vacuum device; The bottom of the outer cylinder (102) is provided with several support frames (3), and the support frames (3) are detachably connected to the foundation at the bottom of the pit (4).

2. The low-temperature residual liquid treatment device according to claim 1, characterized in that, A temperature probe (12) is installed inside the inner cylinder (101).

3. The low-temperature residual liquid treatment device according to claim 1, characterized in that, A cofferdam (7) is set up around the pit (4).

4. The low-temperature residual liquid treatment device according to claim 1, characterized in that, The driving device includes a motor (8), which is connected to a gear, the gear meshing with a rack, and the rack is disposed outside the annular cavity (5).

5. The low-temperature residual liquid treatment device according to claim 1, characterized in that, At least two heating tubes (10) are provided.

6. The low-temperature residual liquid treatment device according to claim 1, characterized in that, An umbrella-shaped air-collecting cavity (14) is provided on the annular cavity (5).

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