A liquid carbon dioxide filling system

Abstract

The invention discloses a liquid carbon dioxide filling system comprising a platform trolley. A liquid carbon dioxide storage tank and a push rod box are fixed to the platform trolley. The liquid carbon dioxide storage tank comprises a liquid feeding port and a liquid discharging port. A carbon dioxide booster pump and two oppositely arranged liquid carbon dioxide storage pipe filling supports are fixed to the outer side of the push rod box. A liquid carbon dioxide storage pipe can be installed on the liquid carbon dioxide storage pipe filling supports. The carbon dioxide booster pump comprises a boosting cylinder block, a piston, a drive gas inlet, a pressurization liquid inlet and a pressurization liquid outlet. A filling controller is arranged on the liquid carbon dioxide storage pipe filling supports. The liquid discharging port of the liquid carbon dioxide storage tank is connected with the pressurization liquid inlet of the carbon dioxide booster pump through a first pipeline. The pressurization liquid outlet is connected with the filling controller through a third pipeline. A downhole compressed air system is connected with the drive gas inlet through a second pipeline. The liquid carbon dioxide filling system is convenient to operate and high in adaptability and operation efficiency and saves energy.

Description

technical field [0001] The invention relates to a system for filling liquid carbon dioxide. Background technique [0002] Shimen is a horizontal roadway that is not directly connected to the ground, and its long axis is perpendicular to or obliquely intersected with the coal seam. The main roadway into the coal seam. Shimen unraveling refers to the process of coal mine tunneling through the rocky roadway and entering the coal roadway. The Shimen tunneling face starts from the minimum normal distance of 10m from the bottom (top) slab of the outburst coal seam until it passes through the coal seam and enters the top (bottom) slab 2m. (Minimum normal distance) process belongs to uncovering coal operation. Before the coal seam is exposed, the coal body is sealed by the surrounding rocks of the roof and floor, and is in the stress concentration area, the elastic potential and gas internal energy in the coal seam cannot be released, and coal and gas outbursts are very likely to ...

AI Technical Summary

Problems solved by technology

[0003] During the specific coal uncovering operation process, due to the limited effect of a single outburst prevention measure, the progress of the Shimen coal uncovering project is slow, which affects the normal production of the coal mine; and unreasonable coal uncovering methods may cause artificial induction during the coal uncovering process. Protrusion, etc., are extremely unfavorable to coal mine safety production

[0004] In the prior art, the method of adopting hydraulic fracturing to unearth coal in Shimen has appeared, but the hydraulic fracturing method has the following disadvantages: 1. Due to the complex geological conditions of coal seam occurrence, the hydraulic fracturing anti-permeability method cannot guarantee the performance of fracturing. Uniform fractures are generated in the area, so in the process of field application, there are often cases where fracturing in some areas is not in place, and the effect of coal seam gas drainage is not good, which affects the coal uncovering work to a certain extent

2. Hydraulic fracturing requires the injection of a large amount of high-pressure water inside the coal seam. On the one hand, the increase in the water content of the coal seam fractures will affect the analysis of the adsorbed gas in the coal seam. On the other hand, the water injected into the coal body will seep from the coal seam Cause water in the working area of ​​roadway excavation, and worsen working conditions; 3. Hydraulic fracturing anti-reflection requires a large plunger high-pressure water pump in the coal mine, and the economic cost is high

5. The coal seam water injection is used to freeze and expand, because the water will only flow along the coal seam cracks, so the cracking effect is uneven, which will cause poor permeability enhancement effect in some areas of the coal seam

In the prior art, injecting carbon dioxide into the liquid storage pipe will consume a lot of electric energy, the operation is very troublesome, and it needs to be filled in the factory, which also increases the transportation cost of a large amount of carbon dioxide

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