Liquid carbon dioxide long-distance safe conveying system and method

Abstract

The invention discloses a liquid carbon dioxide long-distance safe conveying monitoring system and method.A conveying device in the system comprises a conveying pipeline which is laid from the ground to an underground goaf, and the portions, located on the ground and underground, of the conveying pipeline are provided with a ground electric valve and an underground electric valve correspondingly; an in-pipeline CO2 sensor, a pipeline temperature sensor and a pipeline pressure sensor are sequentially arranged in the end, close to the goaf, of the conveying pipeline. A single-chip microcomputer in the monitoring device is electrically connected with a ground electric valve, an underground electric valve, a CO2 sensor in a pipeline, a pipeline temperature sensor, a pipeline pressure sensor and CO2 sensors outside the pipelines. Leakage or blockage of the whole conveying pipeline is monitored in real time through the pressure sensor, the temperature sensor and the carbon dioxide gas sensor, the maintenance efficiency and the goaf fire area fire extinguishing efficiency are improved, manpower, material resources and financial resources are saved, waste is avoided, and liquid carbon dioxide is automatically, safely and effectively injected into the goaf fire area for fire extinguishing.

Description

Technical Field

[0001] The present invention relates to the technical field of fire control, and in particular to a system and method for safely transporting liquid carbon dioxide over long distances. Background Art

[0002] Liquid carbon dioxide is widely used in the treatment of various fires. Liquid carbon dioxide fire extinguishing is divided into two application methods: direct injection into the fire area by ground drilling and transporting tanked liquid carbon dioxide to the vicinity of the fire area for fire extinguishing. Direct injection into the fire area by ground drilling is mainly used in mining areas with shallow buried coal seams in close proximity and large goaf areas. The current ground drilling direct injection technology is simply to inject liquid carbon dioxide into the fire area. Due to the heat absorption of carbon dioxide gasification, a large amount of dry ice is easily produced, causing pipeline blockage. In addition, pipeline leakage may endanger the safety of miners. In order to enhance the safety of coal mine fire prevention and extinguishing and quickly and effectively inject liquid carbon dioxide into the fire area, a long-distance safe transportation monitoring system and monitoring method that can monitor the operation of liquid carbon dioxide throughout the process are urgently needed. Summary of the invention

[0003] In view of the problems existing in the above-mentioned prior art, the present invention discloses a system and method for safe long-distance transportation of liquid carbon dioxide, which can monitor the transportation of liquid carbon dioxide throughout the whole process, detect leakage risks in time and take emergency measures.

[0004] The present invention discloses a long-distance safe transportation monitoring system for liquid carbon dioxide, comprising: a transportation device and a monitoring device, wherein the transportation device comprises a transportation pipeline for transporting liquid carbon dioxide, the transportation pipeline is laid from the ground to the underground goaf, the transportation pipeline located at the ground part is provided with a ground electric valve, the transportation pipeline located at the underground part is provided with an underground electric valve, and the transportation pipeline is provided with an in-pipeline CO2 sensor, a pipeline temperature sensor, and a pipeline pressure sensor in sequence inside the transportation pipeline near one end of the goaf;

[0005] The monitoring device includes an analysis host, a ground communication interface, a downhole optical fiber switch, a communication substation, a single-chip microcomputer, and a plurality of CO2 sensors outside the pipeline arranged on the outer wall of the pipeline; the analysis host, the ground communication interface, the downhole optical fiber switch, the communication substation, and the single-chip microcomputer are communicatively connected in sequence, and the single-chip microcomputer is electrically connected to the ground electric valve, the downhole electric valve, the CO2 sensor inside the pipeline, the pipeline temperature sensor, the pipeline pressure sensor, and each CO2 sensor outside the pipeline.

[0006] Furthermore, each CO2 sensor outside the pipeline is evenly arranged on the outer wall of the delivery pipeline along the delivery direction of the liquid carbon dioxide.

[0007] Furthermore, a single chip microcomputer connected to the communication substation for communication is arranged inside the communication substation.

[0008] Furthermore, the conveying pipeline is mainly composed of a plurality of segmented seamless carbon steel pipes connected together, and adjacent segmented seamless carbon steel pipes are connected by flanges.

[0009] The present invention discloses a method for monitoring the safe long-distance transportation of liquid carbon dioxide. The method is implemented based on the above-mentioned monitoring system for monitoring the safe long-distance transportation of liquid carbon dioxide. The method comprises:

[0010] S1: The surface electric valve and the underground electric valve are opened by controlling the analysis host on the ground, and liquid carbon dioxide is injected into the goaf through the transmission pipeline;

[0011] S2: After the set delay is reached, the single-chip computer obtains the sensor parameters of the CO2 sensor outside the pipeline, the pipeline pressure sensor, the pipeline temperature sensor, and the CO2 sensor inside the pipeline in real time, and uploads them to the analysis host through the communication substation, the downhole optical fiber switch, and the ground communication interface;

[0012] S3: When the analysis host determines that the sensor parameters exceed the standard, the ground electric valve and the underground electric valve are controlled to close to stop the injection of liquid carbon dioxide into the goaf.

[0013] Furthermore, the step S3 specifically includes:

[0014] When the analysis host determines that the concentration parameter of any CO2 sensor outside the pipeline is greater than the corresponding set value, the ground electric valve and the downhole electric valve are controlled to close.

[0015] Furthermore, the step S3 specifically includes:

[0016] When the analysis host determines that the pressure parameter of the pipeline pressure sensor is less than the corresponding set value, the ground electric valve and the downhole electric valve are controlled to be closed.

[0017] Furthermore, the step S3 specifically includes:

[0018] When the analysis host determines that the temperature parameter of the pipeline temperature sensor is greater than the corresponding set value, the ground electric valve and the downhole electric valve are controlled to be closed.

[0019] Furthermore, the step S3 specifically includes:

[0020] When the analysis host determines that the concentration parameter of the CO2 sensor in the pipeline is less than the corresponding set value, the ground electric valve and the downhole electric valve are controlled to close.

[0021] Furthermore, after step S3, the method further includes:

[0022] After the inspection of the conveying pipeline is completed, the process returns to step S1.

[0023] The present invention has at least the following beneficial effects:

[0024] The present invention uses multiple sensors such as pressure, temperature, and carbon dioxide gas to monitor the leakage or blockage of the entire transmission pipeline in real time, thereby improving the maintenance efficiency and the fire extinguishing efficiency in the goaf fire area, saving manpower, material resources, and financial resources, avoiding waste, and realizing the automatic and safe and effective injection of liquid carbon dioxide into the goaf fire area for fire extinguishing.

[0025] Other beneficial effects of the present invention will be described in detail in the specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a structural principle diagram of a liquid carbon dioxide long-distance safe transportation monitoring system disclosed in a preferred embodiment of the present invention.

[0028] Figure 2 It is an electrical connection block diagram of a liquid carbon dioxide long-distance safe transportation monitoring system disclosed in a preferred embodiment of the present invention.

[0029] Among them, 1-CO2 sensor outside the pipeline, 2-pipeline pressure sensor, 3-pipeline temperature sensor, 4-CO2 sensor inside the pipeline, 5-communication substation, 6-downhole optical fiber switch, 7-ground electric valve, 8-analysis host, 9-transmission pipeline, 12-downhole electric valve, 17-ground communication interface, 100-single-chip microcomputer, 101-goaf. DETAILED DESCRIPTION

[0030] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0031] Embodiment 1

[0032] like Figure 1 and Figure 2As shown, this embodiment discloses a long-distance safe transportation monitoring system for liquid carbon dioxide, including a transportation device and a monitoring device. Among them, the transportation pipeline 9 in the transportation device is laid from the ground to the goaf 101 underground, and the transportation pipeline 9 is provided with a ground electric valve 7 and an underground electric valve 12 on the ground and at the place where it enters the underground. The transportation pipeline 9 at the front end of the goaf 101 is provided with a CO2 sensor 4 in the pipeline, a pipeline temperature sensor 3, and a pipeline pressure sensor 2 in sequence.

[0033] The single-chip computer 100 in the monitoring system is electrically connected to: the surface electric valve 7, the underground electric valve 12, the CO2 sensor 4 in the pipeline, the pipeline temperature sensor 3, the pipeline pressure sensor 2, the communication substation 5, and several CO2 sensors 1 outside the pipeline on the outer wall of the transmission pipeline 9. The communication substation 5, the underground optical fiber switch 6, the surface communication interface 17, and the analysis host 8 are sequentially connected in communication.

[0034] In this embodiment, a plurality of off-pipeline CO2 sensors 1 are evenly distributed on the outer wall of the delivery pipeline 9, which can not only comprehensively detect the CO2 concentration, but also quickly and conveniently determine the location of the delivery pipeline 9 that needs maintenance based on the location of the off-pipeline CO2 sensor 1 where the parameter is detected to be exceeded.

[0035] In this embodiment, the single chip microcomputer 100 is arranged inside the communication substation 5 .

[0036] In this embodiment, the delivery pipeline 9 is formed by connecting segmented seamless carbon steel pipes with flanges.

[0037] Embodiment 2

[0038] This embodiment discloses a method for monitoring the safe long-distance transportation of liquid carbon dioxide. The method is implemented based on the long-distance safe transportation monitoring system of liquid carbon dioxide disclosed in the present invention. The method includes:

[0039] ① Start the liquid carbon dioxide long-distance safe transportation monitoring system from the analysis host 8, open the ground electric valve 7 and the underground electric valve 12, and after the set delay (30-120s), the single-chip microcomputer 100 obtains the parameters of several external CO2 sensors 1, pipeline pressure sensor 2, pipeline temperature sensor 3, and internal CO2 sensor 4 on the outer wall of the transportation pipeline 9 in real time, and uploads the parameters to the analysis host 8 through the communication substation 5, the underground optical fiber switch 6, and the ground communication interface 17. When all the above parameters are within the standard, liquid carbon dioxide is continuously injected into the fire area of ​​the goaf 101 to extinguish the fire.

[0040] ② When the concentration parameter of a CO2 sensor 1 outside the pipeline on the outer wall of the transmission pipeline 9 is greater than 0.1%, it is determined that the transmission pipeline 9 is leaking, and the ground electric valve 7 and the underground electric valve 12 are controlled to be closed to stop the injection of liquid carbon dioxide into the fire area of ​​the goaf 101 to extinguish the fire. After the corresponding part of the transmission pipeline 9 is repaired, repeat step ①.

[0041] ③ When the pressure parameter of the pipeline pressure sensor 2 inside the conveying pipeline 9 is less than 0.5MPa or the temperature parameter of the pipeline temperature sensor 3 is less than -35℃ or the concentration parameter of the CO2 sensor 4 in the pipeline is less than 95%, it is judged that the conveying pipeline 9 is blocked, and the ground electric valve 7 and the underground electric valve 12 are controlled to be closed to stop the injection of liquid carbon dioxide into the fire area of ​​the goaf 101 to extinguish the fire. After repairing the blocked conveying pipeline 9, repeat step ①.

[0042] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A liquid carbon dioxide long-distance safe transportation monitoring system, characterized in that: include: A conveying device and a monitoring device, wherein the conveying device comprises a conveying pipeline for conveying liquid carbon dioxide, the conveying pipeline is laid from the ground to the underground goaf, the conveying pipeline located on the ground is provided with a ground electric valve, the conveying pipeline located in the underground is provided with an underground electric valve, and the conveying pipeline is provided with an in-pipeline CO2 sensor, a pipeline temperature sensor, and a pipeline pressure sensor in sequence inside one end of the conveying pipeline near the goaf; The monitoring device includes an analysis host, a ground communication interface, a downhole optical fiber switch, a communication substation, a single-chip microcomputer, and a plurality of CO2 sensors outside the pipeline arranged on the outer wall of the pipeline; the analysis host, the ground communication interface, the downhole optical fiber switch, the communication substation, and the single-chip microcomputer are communicatively connected in sequence, and the single-chip microcomputer is electrically connected to the ground electric valve, the downhole electric valve, the CO2 sensor inside the pipeline, the pipeline temperature sensor, the pipeline pressure sensor, and each CO2 sensor outside the pipeline.

2. The liquid carbon dioxide long-distance safe transportation monitoring system according to claim 1 is characterized in that: The CO2 sensors outside each pipeline are evenly arranged on the outer wall of the delivery pipeline along the delivery direction of the liquid carbon dioxide.

3. The liquid carbon dioxide long-distance safe transportation monitoring system according to claim 1 is characterized in that: The single chip microcomputer connected to the communication substation is arranged inside the communication substation.

4. The liquid carbon dioxide long-distance safe transportation monitoring system according to claim 1 is characterized in that: The transmission pipeline is mainly composed of several segmented seamless carbon steel pipes, and adjacent segmented seamless carbon steel pipes are connected by flanges.

5. A method for monitoring the safe long-distance transportation of liquid carbon dioxide, characterized in that: The method is implemented based on the liquid carbon dioxide long-distance safe transportation monitoring system according to any one of claims 1 to 4, and the method comprises: S1: The surface electric valve and the underground electric valve are opened by controlling the analysis host on the ground, and liquid carbon dioxide is injected into the goaf through the transmission pipeline; S2: After the set delay is reached, the single-chip computer obtains the sensor parameters of the CO2 sensor outside the pipeline, the pipeline pressure sensor, the pipeline temperature sensor, and the CO2 sensor inside the pipeline in real time, and uploads them to the analysis host through the communication substation, the downhole optical fiber switch, and the ground communication interface; S3: When the analysis host determines that the sensor parameters exceed the standard, the ground electric valve and the underground electric valve are controlled to close to stop the injection of liquid carbon dioxide into the goaf.

6. The method for monitoring the safe long-distance transportation of liquid carbon dioxide according to claim 5, characterized in that: The step S3 specifically includes: When the analysis host determines that the concentration parameter of any CO2 sensor outside the pipeline is greater than the corresponding set value, the ground electric valve and the downhole electric valve are controlled to close.

7. The method for monitoring the safe long-distance transportation of liquid carbon dioxide according to claim 5, characterized in that: The step S3 specifically includes: When the analysis host determines that the pressure parameter of the pipeline pressure sensor is less than the corresponding set value, the ground electric valve and the downhole electric valve are controlled to be closed.

8. The method for monitoring the safe long-distance transportation of liquid carbon dioxide according to claim 5, characterized in that: The step S3 specifically includes: When the analysis host determines that the temperature parameter of the pipeline temperature sensor is greater than the corresponding set value, the ground electric valve and the downhole electric valve are controlled to be closed.

9. The method for monitoring the safe long-distance transportation of liquid carbon dioxide according to claim 5, characterized in that: The step S3 specifically includes: When the analysis host determines that the concentration parameter of the CO2 sensor in the pipeline is less than the corresponding set value, the ground electric valve and the downhole electric valve are controlled to close.

10. The method for monitoring the safe long-distance transportation of liquid carbon dioxide according to claim 5, characterized in that: After step S3, the method further includes: After the inspection of the conveying pipeline is completed, the process returns to step S1.

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