CN212178525U - Carbon dioxide low-temperature vaporization device - Google Patents
Carbon dioxide low-temperature vaporization device Download PDFInfo
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- CN212178525U CN212178525U CN202020736872.5U CN202020736872U CN212178525U CN 212178525 U CN212178525 U CN 212178525U CN 202020736872 U CN202020736872 U CN 202020736872U CN 212178525 U CN212178525 U CN 212178525U
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Abstract
The utility model discloses a carbon dioxide low temperature vaporization device, including cooling pipeline, fluid infusion pipeline, current-limiting blind plate and temperature regulating valve. The liquid supplementing pipeline divides liquid carbon dioxide from a pipeline before entering the vaporizer, and is connected with the cooling pipeline behind the vaporizer outlet. The inlet end of the temperature regulating valve is connected with the liquid supplementing pipeline, and the outlet end of the temperature regulating valve is connected with the cooling pipeline. The flow-limiting blind plate is arranged beside the temperature regulating valve on the liquid supplementing pipeline and is positioned on one side of the flow-direction cooling pipeline. The damage of the equipment caused by the formation of dry ice can be reduced, and the electric energy consumption in the vaporization process is reduced.
Description
Technical Field
The utility model relates to a mine inerting field, concretely relates to carbon dioxide vapourizing unit.
Background
When a coal seam of a mine is mined, coal is exposed in air and can be oxidized, so that the temperature of a coal body is increased, and fire hazard, even fire, occurs. Therefore, when a fire and a fire hazard are discovered, a method of inerting a mine is mostly adopted, inert gases such as carbon dioxide are filled into the mine, and the fire hazard is eliminated by reducing the concentration of oxygen and combustible gases and the ambient temperature, so that the fire hazard and the danger of fire and explosion are reduced.
The prior methods applied to inerting coal mines comprise a vaporization method and a direct injection method. The direct injection method is to inject liquid carbon dioxide into the well by using a pipeline, and dilute the concentration of oxygen and combustible gas after the liquid carbon dioxide is vaporized by the pipeline. However, when a large amount of liquid carbon dioxide is vaporized, heat is absorbed, so that the temperature around the pipeline is rapidly reduced, snowflake-shaped dry ice is generated to block the pipe orifice, and the inerting process is influenced. The vaporization method is to vaporize liquid carbon dioxide by an air bath vaporizer or a water bath vaporizer. The air bath vaporizer is greatly influenced by the vaporization environment temperature, the flow of the vaporized gas is usually insufficient, the vaporization effect of the liquid in the air bath vaporizer cannot be judged due to too low outlet temperature, the liquid is very easy to be entrained, and the dry ice in the conveying pipeline is blocked.
The water bath vaporizer does not generate dry ice at the pipe orifice basically, but the method needs to be carried out under the assistance of heat power or electric power, and generally, the power consumption of the water bath vaporizer for vaporizing 1 ton of liquid carbon dioxide is large and is about 100-120 KW/h. In addition, the temperature of carbon dioxide output by the vaporizer is usually 20-40 ℃ due to technical and process limitations, and an intermediate cooling medium is sometimes added in order to prevent gaseous carbon dioxide with higher temperature from weakening the inerting efficiency of a mine. At present, most of cooling media in the middle of the water bath vaporizer are water, and the icing in the water bath vaporizer can be caused by the output of gas with too low temperature, so that equipment is damaged. Therefore, the application effect and the application range of the vaporization method in the process of inerting the coal mine are limited.
Disclosure of Invention
An object of the utility model is to provide an exportable low temperature gaseous carbon dioxide's vapourizing unit reduces because of the equipment damage that leads to forming the dry ice, reduces the power consumption among the vaporization process.
Carbon dioxide low temperature vaporizer, including vaporizer (2), fluid infusion pipeline (3), temperature regulating valve (4), current-limiting blind plate (5), fluid infusion mouth (6), cooling pipeline (7), manometer (9) and thermometer (10).
One end of the cooling pipeline (7) is connected with the air outlet of the vaporizer (2), the other end of the cooling pipeline is directly communicated with the underground, and carbon dioxide vaporized by the vaporizer (2) is communicated to the underground through the cooling pipeline (7).
The liquid supplementing pipeline (3) divides liquid carbon dioxide from a pipeline before entering the vaporizer (2), and is connected with the cooling pipeline (7) after the outlet of the vaporizer (2).
The total amount of liquid carbon dioxide supplemented in the liquid supplementing pipeline (3) is 15-25% of the total amount of carbon dioxide passing through the vaporizer (2).
The inlet end of the temperature regulating valve (4) is connected with the liquid supplementing pipeline (3), and the outlet end of the temperature regulating valve is connected with the cooling pipeline (7).
The flow-limiting blind plate (5) is arranged beside the temperature regulating valve (4) on the liquid supplementing pipeline (3) and is positioned on one side of the flow-direction cooling pipeline (7).
The carbon dioxide low-temperature vaporizing device further comprises a pressure gauge (9), a thermometer (10) and a liquid supplementing port (6), which are all installed on the cooling pipeline (7), and the pressure gauge (9) and the thermometer (10) are installed behind the temperature control point (8).
The length of the pipeline from the liquid supplementing port (6) to the temperature control point (8) is not less than 1.0 meter.
And the liquid supplementing port (6) extends into the cooling pipeline (7) from the joint and extends towards the direction of the air flow.
Further, the liquid supplementing port (6) is arranged on the central axis of the cooling pipeline (7).
Furthermore, the length of the liquid supplementing port (6) extending into the cooling pipeline (7) is not more than 0.05 m.
And no pipe fitting is arranged in a short distance behind the liquid supplementing port (6), and the shortest distance between the pressure gauge (9) and the thermometer (10) and the liquid supplementing port (6) is not less than 1 m.
The utility model has the advantages that:
1) on the premise of not changing the application condition of the vaporizer, the technical defect that the traditional vaporizer cannot obtain low-temperature gas is overcome, the application effect and the application range of the vaporization method in coal mine inerting are improved, and coal in a mine can be rapidly cooled while the coal mine inerting is carried out.
2) The temperature of the gaseous carbon dioxide is reduced by directly utilizing the supplemented liquid carbon dioxide without providing cold energy from the outside, and meanwhile, a part of absorbed heat is vaporized by the liquid carbon dioxide, so that the vaporization efficiency is integrally improved, and the energy consumption is reduced.
Drawings
Fig. 1 is a schematic view of the operation of the carbon dioxide low-temperature vaporization device of the present invention.
Fig. 2 is a pipeline layout diagram of the carbon dioxide low-temperature vaporizer of the present invention.
Fig. 3 is a schematic view of a pipeline structure between a fluid infusion port and a pressure and temperature measuring meter.
Detailed Description
Example 1 mine inerting operation.
As shown in fig. 1, the carbon dioxide cryogenic liquefaction device comprises: the device comprises a vaporizer 2, a liquid supplementing pipeline 3, a temperature regulating valve 4, a flow limiting blind plate 5, a liquid supplementing port 6, a cooling pipeline 7, a temperature control point 8, a pressure gauge 9 and a thermometer 10.
One end of the cooling pipeline 7 is connected to the air outlet of the vaporizer 2, the other end of the cooling pipeline is directly communicated with the underground, and carbon dioxide vaporized by the vaporizer 2 is communicated to the underground through the cooling pipeline 7 to perform inerting operation on a mine.
The liquid supplementing pipeline 3 divides liquid carbon dioxide from a pipeline before entering the vaporizer 2, and is connected with the cooling pipeline 7 after the outlet of the vaporizer 2. Because the vaporization heat of the liquid carbon dioxide is 347KJ/KG, the solidification temperature is-56.6 ℃, the pressure is reduced to 0.518MPA (dead) under the adiabatic condition, the liquid is vaporized and partially cooled into dry ice, and the heat capacity of the gaseous carbon dioxide is smaller than 0.85KJ/KG.K (Cp), the total amount of the liquid carbon dioxide supplemented in the liquid supplementing pipeline 3 is 15-25% of the total amount of the carbon dioxide passing through the vaporizer 2.
The inlet of the temperature regulating valve 4 is connected with the liquid supplementing pipeline 3, the outlet of the temperature regulating valve is connected with the cooling pipeline 7, and the temperature of the system output gas is controlled by regulating the supplement amount of the liquid carbon dioxide.
The flow-limiting blind plate 5 is arranged beside the temperature regulating valve 4 on the liquid supplementing pipeline 3 and is positioned on one side of the flow direction cooling pipeline 7, so that the phenomenon that dry ice flows into and blocks the cooling pipeline 7 due to overlarge regulating range of the regulating valve is prevented.
In addition, as shown in fig. 2, the pressure gauge 9, the temperature gauge 10 and the fluid infusion port 6 are installed on the cooling pipeline 7 behind the temperature control point 8.
The length of the liquid supplementing port 6 from the temperature control point 8 is not less than 1.0 meter, so that the vaporization effect of the liquid carbon dioxide in the cooling pipeline 7 is ensured.
And the liquid supplementing port 6 extends into the cooling pipeline 7 from the joint and extends towards the air flow direction, so that the flow direction of supplemented liquid carbon dioxide is consistent with that of original gaseous carbon dioxide in the cooling pipeline 7.
As shown in fig. 3, the fluid infusion port 6 is disposed on the central axis of the cooling pipeline, and the length extending into the cooling pipeline 7 should not be greater than 0.05 m, so as to prevent the liquid carbon dioxide from vaporizing in the fluid infusion pipeline 3, reduce the amount of the liquid carbon dioxide infused into the cooling pipeline 7, and influence the fluid infusion effect.
The cooling pipeline 7 short distance behind fluid infusion mouth 6 does not set up the pipe fitting, prevents that the pipe fitting from influencing gaseous state, liquid carbon dioxide and mixing, and manometer 9 and thermometer 10 are apart from fluid infusion mouth 6 shortest not less than 1 meter, guarantee that the gaseous carbon dioxide heat transfer of supplementary liquid carbon dioxide and follow 2 outputs of vaporizer is even steady.
Operation during carbon dioxide low temperature vaporizer, at first detecting system gas tightness:
1) and butting the gas phase of the carbon dioxide tank car 1 with the system, opening an inlet valve, an outlet valve and root valves of all instruments of the vaporizer 2, slowly opening a gas phase valve of the carbon dioxide tank car, and pressurizing the system.
2) And when the pressure of the system rises to 1.0MPa, closing a gas phase valve of the carbon dioxide tank car 1, stopping pressure for 5 minutes, carrying out system inspection on the injection, and finding a leakage point and carrying out pressure relief treatment in time.
And after the system is checked and confirmed to have no leakage point, opening the gas phase valve of the carbon dioxide tank car 1, pressurizing the system until the pressure of the system is balanced with the pressure of the tank car, closing the gas phase valve of the carbon dioxide tank car 1, and stopping pressurizing for 30 minutes.
Checking to confirm that the system has no leak point, the system pressure has no obvious change, and the airtight test is finished.
Secondly, performing mine inerting operation:
1) closing a gas phase valve of the carbon dioxide tank car 1 and an inlet valve of the vaporizer 2, opening a pressure release valve of a gas phase pipeline of the tank car, and releasing pressure of a connecting pipeline of the carbon dioxide tank car 1 and the vaporizer 2.
2) And dismantling a gas phase interface of the carbon dioxide tank car 1, connecting a liquid phase interface with the vaporizer 2, opening a liquid phase valve of the carbon dioxide tank car 1, and opening an inlet valve of the vaporizer 2 to deliver liquid to the system.
3) And opening an outlet valve of the vaporizer 2, slowly opening a wellhead shut-off valve, and controlling the vaporization pressure not less than 1.0MPA, the water bath temperature not less than 40 ℃ of the vaporizer 2 and the carbon dioxide temperature 20-40 ℃ at the outlet of the vaporizer 2.
After the system operation parameters are stable, the temperature regulating valve 4 of the cooler is set at minus 30 ℃ for use, and the temperature of carbon dioxide entering the well is controlled to be minus 20 ℃ to minus 50 ℃.
In addition, before the inerting operation is carried out, the hidden danger area is firstly sealed to form a sealed area 12, after hidden dangers are eliminated, the plug is removed, the roadway 11 and the sealed area 12 are communicated, and normal work is recovered.
And recording the system tank car pressure, vaporization pressure, injection flow, well entry temperature and well entry pressure in the operation process.
Example 2 system pipe burst treatment operation.
When the pipe burst condition occurs in the carbon dioxide low-temperature gasification device, the following operations are carried out:
1) and closing a liquid phase or gas phase valve of the carbon dioxide tank car 1, and cutting off liquid supply or gas supply of the system.
2) And closing the well head shut-off valve to prevent air from entering the closed system.
3) And evacuating the operating personnel to a safe area, performing on-site warning, and performing accident investigation and treatment after the system pressure is released to normal pressure.
Example 3 system power outage handling operations.
When the carbon dioxide low-temperature vaporizing device is suddenly powered off, in order to prevent the temperature of the vaporizer 2 from being greatly reduced in a short time and dry ice from blocking a pipeline, the following operations are carried out:
1) and closing a liquid phase valve of the carbon dioxide tank car 1, cutting off a liquid source entering the vaporizer 2, and preventing the vaporizer 2 from freezing in a water bath.
And (4) taking the water bath temperature of the vaporizer 2 into consideration, and completely vaporizing the liquid carbon dioxide in the vaporization system into a closed area by utilizing the residual temperature of the vaporizer 2.
2) And closing the temperature regulating valve 4 and stopping supplying liquid to the cooler.
3) And when the water bath temperature of the vaporizer 2 is lower than 20 ℃, closing an outlet valve of the vaporizer 2 and a wellhead stop valve, and if residual liquid still exists in the vaporization system, discharging the residual liquid through opening a liquid phase outlet pressure release valve of the tank car.
4) And when the pressure in the system is reduced to normal pressure, all valves in the system are closed.
Claims (7)
1. A low-temperature carbon dioxide vaporization device comprises a vaporizer (2) for heating liquid carbon dioxide, and is characterized by also comprising:
a cooling pipeline (7) for conveying gaseous carbon dioxide, wherein one end of the cooling pipeline (7) is connected to the air outlet of the vaporizer (2), the other end of the cooling pipeline is directly communicated with the underground, and the carbon dioxide vaporized by the vaporizer (2) is communicated to the underground through the cooling pipeline (7);
the liquid supplementing pipeline (3) is used for adding liquid carbon dioxide, the liquid carbon dioxide is distributed in a pipeline before entering the vaporizer (2) by the liquid supplementing pipeline (3), the pipeline is connected with the cooling pipeline (7) after the outlet of the vaporizer (2), and the total amount of the liquid carbon dioxide supplemented in the liquid supplementing pipeline (3) is 15-25% of the total amount of the carbon dioxide passing through the vaporizer (2);
the inlet end of the temperature regulating valve (4) is connected with the liquid supplementing pipeline (3), and the outlet end of the temperature regulating valve (4) is connected with the cooling pipeline (7);
and the flow limiting blind plate (5) is used for preventing dry ice from blocking the cooling pipeline (7), and the flow limiting blind plate (5) is arranged beside the temperature regulating valve (4) on the liquid supplementing pipeline (3) and is positioned on one side of the flow direction cooling pipeline (7).
2. The low-temperature carbon dioxide vaporizing device according to claim 1, further comprising a pressure gauge (9), a temperature gauge (10) and a liquid supplementing port (6) which are all installed on the cooling pipeline (7), wherein the pressure gauge (9) and the temperature gauge (10) are installed behind the temperature control point (8).
3. The low-temperature carbon dioxide vaporizing device according to claim 2, wherein the length of the pipeline from the liquid supplementing port (6) to the temperature control point (8) is not less than 1.0 m.
4. The cryogenic carbon dioxide vaporizing device according to claim 2, wherein the fluid infusion port (6) extends from the junction into the cooling line (7) and extends in the direction of the gas flow.
5. The low-temperature carbon dioxide vaporizing device according to claim 2, wherein the fluid infusion port (6) is disposed on the central axis of the cooling pipeline (7).
6. The low-temperature carbon dioxide vaporizing device according to claim 2, wherein no pipe is arranged in a short distance behind the liquid supplementing port (6), and the shortest distance between the pressure gauge (9) and the thermometer (10) and the liquid supplementing port (6) is not less than 1 m.
7. The low-temperature carbon dioxide vaporizing device according to claim 4, wherein the length of the liquid supplementing port (6) extending into the cooling pipeline (7) is not more than 0.05 m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020736872.5U CN212178525U (en) | 2020-05-08 | 2020-05-08 | Carbon dioxide low-temperature vaporization device |
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| CN202020736872.5U CN212178525U (en) | 2020-05-08 | 2020-05-08 | Carbon dioxide low-temperature vaporization device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115388328A (en) * | 2022-08-17 | 2022-11-25 | 山东科技大学 | Underground CO (carbon monoxide) storage for coal mine 2 Gasification energy-saving device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115388328A (en) * | 2022-08-17 | 2022-11-25 | 山东科技大学 | Underground CO (carbon monoxide) storage for coal mine 2 Gasification energy-saving device and method |
| CN115388328B (en) * | 2022-08-17 | 2023-11-14 | 山东科技大学 | Underground coal mine CO burying 2 Energy-saving gasification device and method |
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Effective date of registration: 20210220 Address after: 047500 Zhonghua East Street, Lucheng City, Changzhi City, Shanxi Province Patentee after: TIANJI COAL CHEMICAL INDUSTRY GROUP Co.,Ltd. Patentee after: Tianji Group Applied Chemical Co.,Ltd. Address before: 047507 Zhonghua East Street, Lucheng City, Changzhi City, Shanxi Province Patentee before: TIANJI COAL CHEMICAL INDUSTRY GROUP Co.,Ltd. |