Recovery device for liquid in liquid carbon dioxide filling hose
By introducing components such as a three-way valve, a buffer tank, a pump body, and a high-pressure gas source into the filling device, the problem of residual liquid carbon dioxide in the filling hose that cannot be recovered has been solved, and the effective recovery and utilization of resources has been achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YANKUANG GUOHONG CHEM
- Filing Date
- 2025-04-29
- Publication Date
- 2026-05-01
AI Technical Summary
In existing liquid carbon dioxide filling devices, the residual liquid carbon dioxide inside the filling hose cannot be recovered, resulting in resource waste.
By introducing components such as a three-way valve, buffer tank, pump body and high-pressure air source into the filling device, the residual liquid carbon dioxide in the filling hose can be recovered, and the residual liquid can be blown into the tank truck or storage tank using the high-pressure air source.
It enables the recovery of residual liquid carbon dioxide inside the filling hose, saving resources, reducing waste, and improving resource utilization.
Smart Images
Figure CN224188421U_ABST
Abstract
Description
A liquid recovery device for a liquid carbon dioxide filling hose Technical Field
[0001] This utility model relates to the field of carbon dioxide filling technology, specifically to a liquid recovery device in a liquid carbon dioxide filling hose. Background Technology
[0002] Liquid carbon dioxide refers to carbon dioxide gas liquefied into a liquid form under high pressure and low temperature. Liquid carbon dioxide is a refrigerant used to preserve food and for artificial rainmaking. In addition, it is an industrial raw material used to produce soda ash, urea, and soft drinks, among other things, and has a wide range of applications.
[0003] Liquid carbon dioxide production uses decarbonized regenerated gas from a low-temperature methanol washing process as raw material. Industrial-grade CO2 purification is achieved through three-stage purification: First, pre-desulfurization is carried out in the pretreatment section using an iron oxide catalyst bed to reduce the H2S content to below 5 ppm; then, it enters an activated carbon adsorption tower to deeply remove organic impurities such as methanol. The adsorbent adopts a multi-layer gradient packing structure to improve contact efficiency; finally, it is condensed and liquefied in a low-temperature distillation tower at -35℃ and 2.0 MPa to produce liquid carbon dioxide product with a purity of ≥99.9%.
[0004] The carbon dioxide liquid product produced by the above method is stored in a liquid storage tank. The liquid discharged from the bottom of the liquid storage tank is pressurized by a filling pump and then filled into a tank truck using a filling hose of ≥6 meters in length before being sold.
[0005] Referring to Figure 2, the existing filling device includes a storage tank 1. The bottom of the storage tank 1 is connected to the input end of the first pipeline 3. The output end of the first pipeline 3 is connected to the input end of the filling hose 7 via a first connector 6. The output end of the filling hose 7 is connected to the liquid inlet of the tank truck 10 via a second connector 9. Along the flow direction of the liquid in the first pipeline 3, a regulating valve 2, a first pump body 4, and a first manual valve 5 are sequentially installed on the first pipeline 3. The first pipeline 3 is connected to a second pipeline 20 in a T-shape. A drain valve 21 is installed on the second pipeline 20. The connection between the first pipeline 3 and the second pipeline 20 is located between the first manual valve 5 and the first connector 6. After the liquid carbon dioxide is filled by this filling device, the liquid inlet valve of the tank truck 10 is closed, and the drain valve 21 is opened to discharge the residual liquid carbon dioxide in the filling hose 7 through the second pipeline 20. In actual operation, because the filling hose 7 is relatively long, a large amount of residual liquid carbon dioxide remains inside. After discharge, it cannot be recovered, resulting in a waste of this portion of liquid carbon dioxide. Summary of the Invention
[0006] To address the technical problem of waste caused by the inability to recover residual liquid carbon dioxide in the filling hose after filling, this utility model aims to provide a liquid recovery device for liquid carbon dioxide filling hoses, which can recover residual liquid carbon dioxide in the filling hose after filling and return it to the tank truck and / or storage tank, thus saving resources.
[0007] The technical solution adopted in this utility model is as follows:
[0008] A liquid recovery device for a liquid carbon dioxide filling hose includes a storage tank. The bottom outlet of the storage tank is connected to the input end of a first pipeline. The output end of the first pipeline is connected to the input end of the filling hose via a first connector. Along the flow direction of the liquid in the first pipeline, a regulating valve, a first pump body, and a first manual valve are sequentially arranged on the first pipeline. The first pipeline has a second pipeline connected to it in a T-shape. A drain valve is arranged on the second pipeline. The connection between the first pipeline and the second pipeline is located between the first manual valve and the first connector. The output end of the filling hose is connected to the first port of a three-way valve. The second port of the three-way valve is connected to the inlet of the tank body of a tank truck via a second connector. The third port of the three-way valve is connected to the input end of a third pipeline. The output end of the third pipeline is connected to the inlet end on the side of a buffer tank. The bottom outlet of the buffer tank is connected to the input end of a fourth pipeline. The output end of the fourth pipeline is connected to the inlet end on the side of the storage tank. The device also includes a fifth pipeline. The input end of the fifth pipeline is connected to the outlet end of a high-pressure gas source. The output end of the fifth pipeline forms a T-shape connection with the second pipeline.
[0009] It should be further noted that a second manual valve is installed on the third pipeline. Its function is to control the shut-off or opening of the third pipeline, facilitating the backflow of liquid carbon dioxide from the filling hose into the buffer tank.
[0010] It should be further explained that the fourth pipeline is equipped with a second pump and a third manual valve. The function of the second pump is to add liquid from the buffer tank to the storage tank when the pressure in the buffer tank is insufficient. At the same time, the third manual valve facilitates the control of shutting off or opening the pipeline, making operation convenient.
[0011] It should be further noted that the fifth pipeline is equipped with a fourth manual valve and a shut-off valve. The fourth manual valve is useful for controlling the opening or closing of the fifth pipeline, while the shut-off valve is useful for cutting off the high-pressure medium.
[0012] It should be further noted that the buffer tank is equipped with a pressure gauge. Its function is to monitor the air pressure inside the buffer tank in real time.
[0013] It should be further noted that the filling hose should be ≥6 m in length and ≥50 mm in inner diameter. High-pressure explosion-proof hoses are preferred. Furthermore, based on the principle of minimizing costs, the filling hose should be 6 m in length and 50 mm in inner diameter.
[0014] It should be further explained that the high-pressure gas source is a nitrogen cylinder. The nitrogen cylinder is filled with high-pressure gas, and the nitrogen medium does not react with carbon dioxide, which facilitates purging under high pressure.
[0015] The beneficial effects of this invention are as follows: The output end of the filling hose is connected to a three-way valve, and a second pipeline is connected to the fifth pipeline. When filling is complete, if the pressure inside the tank truck is less than the pressure of the high-pressure gas source and there is still filling capacity remaining in the tank truck, the high-pressure gas source is activated to purge the residual liquid carbon dioxide in the filling hose into the tank truck for recovery. If the pressure inside the tank truck is too high or exceeds the filling capacity, the three-way valve is adjusted to the direction of the third pipeline, and the high-pressure gas source is activated to purge the residual liquid carbon dioxide in the filling hose into a buffer tank for temporary storage. When the liquid carbon dioxide capacity in the buffer tank increases and the pressure inside the tank becomes high, the second pump is activated to guide the liquid carbon dioxide from the buffer tank into the storage tank, thus achieving liquid carbon dioxide recovery. This invention can recover the residual liquid carbon dioxide in the filling hose after filling into the tank truck and / or storage tank, saving resources. Attached Figure Description
[0016] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 is a structural schematic diagram of Embodiment 1 of the present invention.
[0018] Figure 2 is a structural schematic diagram of an existing filling device in the background art of this utility model.
[0019] In the diagram, 1-storage tank, 2-regulating valve, 3-first pipeline, 4-first pump body, 5-first manual valve, 6-first connector, 7-filling hose, 8-three-way valve, 9-second connector, 10-tank truck, 11-second manual valve, 12-third pipeline, 13-buffer tank, 14-second pump body, 15-third manual valve, 16-nitrogen cylinder, 17-fourth manual valve, 18-fifth pipeline, 19-stop valve, 20-second pipeline, 21-drain valve, 22-pressure gauge, 23-fourth pipeline. Detailed Implementation
[0020] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.
[0021] Example 1
[0022] Referring to Figure 1, this utility model provides a liquid recovery device for a liquid carbon dioxide filling hose, including a storage tank 1. The liquid outlet at the bottom of the storage tank 1 is connected to the input end of a first pipeline 3. The output end of the first pipeline 3 is connected to the input end of a filling hose 7 (6 m in length and 50 mm in inner diameter) via a first connector 6. Along the flow direction of the liquid in the first pipeline 3, a regulating valve 2, a first pump body 4, and a first manual valve 5 are sequentially arranged on the first pipeline 3. The first pipeline 3 is connected to a second pipeline 20 in a T-shape. A drain valve 21 is arranged on the second pipeline 20. The connection between the first pipeline 3 and the second pipeline 20 is located between the first manual valve 5 and the first connector 6. The output end of the filling hose 7 is connected to the first port of a three-way valve 8. The second port of the three-way valve 8 is connected to a tank truck 10 via a second connector 9. The tank body has a liquid inlet, and the third interface of the three-way valve 8 is connected to the input end of the third pipeline 12. The output end of the third pipeline 12 is connected to the liquid inlet on the side of the buffer tank 13. The liquid outlet at the bottom of the buffer tank 13 is connected to the input end of the fourth pipeline 23. The output end of the fourth pipeline 23 is connected to the liquid inlet on the side of the storage tank 1. The tank body also includes a fifth pipeline 18. The input end of the fifth pipeline 18 is connected to the outlet of the high-pressure gas source, which is a nitrogen cylinder 16. The output end of the fifth pipeline 18 forms a T-shaped connection with the second pipeline 20.
[0023] In order to control the cutting off or opening of the third pipeline 12, and to facilitate the return of liquid carbon dioxide in the filling hose 7 to the buffer tank 13, this utility model provides a second manual valve 11 on the third pipeline 12.
[0024] To replenish the liquid in the buffer tank 13 to the storage tank 1 when the pressure in the buffer tank 13 is insufficient, and to facilitate operation by controlling the opening or closing of the fourth pipeline 23, a second pump body 14 and a third manual valve 15 are provided on the fourth pipeline 23. The second pump body 14 can pressurize the liquid in the pipeline and fill it into the storage tank 1.
[0025] To control the opening or closing of the fifth pipeline 18, a fourth manual valve 17 and a shut-off valve 19 are provided on the fifth pipeline 18. The shut-off valve 19 is convenient for cutting off the high-pressure medium.
[0026] In order to monitor the air pressure inside the buffer tank 13 in real time and determine the pressure inside the tank, a pressure gauge 22 is installed on the buffer tank 13.
[0027] The working process of this utility model is as follows:
[0028] Using the decarbonized regenerated gas generated from the low-temperature methanol washing process as raw material, industrial-grade CO2 purification is achieved through three-stage purification treatment: First, in the pretreatment section, an iron oxide catalyst bed is used for pre-desulfurization to reduce the H2S content to below 5 ppm; then, it enters an activated carbon adsorption tower to deeply remove organic impurities such as methanol, and the adsorbent adopts a multi-layer gradient packing structure to improve contact efficiency; finally, it is condensed and liquefied in a low-temperature distillation tower at -35℃ and 2.0 MPa to produce liquid carbon dioxide product with a purity of ≥99.9% and stored in storage tank 1.
[0029] When it is necessary to fill the liquid carbon dioxide in the storage tank 1 into the tank of the tank truck 10, open the regulating valve 2 and the first manual valve 5, close all other valves, start the first pump body 4, pressurize the liquid carbon dioxide in the storage tank 1 and fill it into the tank of the tank truck 10 through the corresponding pipeline.
[0030] If, when filling is complete, the pressure inside the tank of the tank truck 10 is less than the pressure inside the high-pressure nitrogen cylinder 16 and there is still filling capacity inside the tank of the tank truck 10, then close the regulating valve 2 and the first manual valve 5, open the fourth manual valve 17 and the shut-off valve 19, and open the outlet of the nitrogen cylinder 16 to purge the residual liquid carbon dioxide in the filling hose 7 into the tank of the tank truck 10 for recovery.
[0031] If, after filling, the pressure inside the tank of the tanker truck 10 is too high or exceeds the filling capacity, the flow direction from the three-way valve 8 to the third pipeline 12 is adjusted, and the fourth manual valve 17, the shut-off valve 19, and the second manual valve 11 are opened. The outlet of the high-pressure nitrogen cylinder 16 is opened to purge the residual liquid carbon dioxide in the filling hose 7 into the buffer tank 13 for temporary storage. After multiple purgings, when the liquid carbon dioxide capacity in the buffer tank 13 increases and the pressure inside the tank is high, the third manual valve 15 is opened, and the second pump 14 is started to guide the liquid carbon dioxide in the buffer tank 13 into the storage tank 1, thus realizing the recovery of liquid carbon dioxide.
[0032] The economic benefits generated by this utility model:
[0033] On average, 20 truckloads of liquid carbon dioxide are filled daily. This invention can reduce liquid discharge by 20 times. The filling hose is L=6m long, the inner diameter R is 50mm, and the radius r=0.025m. The amount of liquid discharged each time is: t=π·r 2 L = 3.14 × 0.025 2 ×6=0.0118m 3The daily emissions are: 20 × 0.0118 = 0.236 m³. 3 .
[0034] Assuming 350 filling days per year, the annual savings are calculated as follows: filling days × liquid discharge volume × average liquid price = 350 × 0.236 × 1000 = 82,600 yuan (liquid is calculated at 1,000 yuan / cubic meter).
[0035] In summary, this utility model can recover the residual liquid carbon dioxide in the filling hose 7 after filling and return it to the tank truck 10 and / or storage tank 1, thus saving resources and having economic benefits.
[0036] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A liquid recovery device for a liquid carbon dioxide filling hose, comprising a storage tank, the bottom outlet of the storage tank being connected to the input end of a first pipeline, the output end of the first pipeline being connected to the input end of the filling hose via a first connector, a regulating valve, a first pump body, and a first manual valve being sequentially arranged on the first pipeline along the flow direction of the liquid within the first pipeline, a second pipeline being connected to the first pipeline in a T-shape, a drain valve being arranged on the second pipeline, and the connection point between the first pipeline and the second pipeline being located between the first manual valve and the first connector, characterized in that... The output end of the filling hose is connected to the first port of the three-way valve. The second port of the three-way valve is connected to the tank inlet of the tank truck via the second connector. The third port of the three-way valve is connected to the input end of the third pipeline. The output end of the third pipeline is connected to the inlet end on the side of the buffer tank. The outlet end at the bottom of the buffer tank is connected to the input end of the fourth pipeline. The output end of the fourth pipeline is connected to the inlet end on the side of the storage tank. It also includes a fifth pipeline. The input end of the fifth pipeline is connected to the outlet end of the high-pressure gas source. The output end of the fifth pipeline forms a T-connection with the second pipeline.
2. The liquid recovery device in the liquid carbon dioxide filling hose as described in claim 1, characterized in that, A second manual valve is installed on the third pipeline.
3. The liquid recovery device in the liquid carbon dioxide filling hose as described in claim 1 or 2, characterized in that, The fourth pipeline is equipped with a second pump body and a third manual valve.
4. The liquid recovery device in the liquid carbon dioxide filling hose as described in claim 1 or 2, characterized in that, The fifth pipeline is equipped with a fourth manual valve and a shut-off valve.
5. The liquid recovery device in the liquid carbon dioxide filling hose as described in claim 1 or 2, characterized in that, The buffer tank is equipped with a pressure gauge.
6. The liquid recovery device in the liquid carbon dioxide filling hose as described in claim 1 or 2, characterized in that, The length of the filling hose is ≥6 m and the inner diameter is ≥50 mm.
7. The liquid recovery device in the liquid carbon dioxide filling hose as described in claim 6, characterized in that, The filling hose is 6 m long and has an inner diameter of 50 mm.
8. The liquid recovery device in the liquid carbon dioxide filling hose as described in claim 1 or 2, characterized in that, The high-pressure gas source is a nitrogen cylinder.