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Segmented control type liquid nitrogen freezer and working method
The invention discloses a segmented control type liquid nitrogen freezer and a working method, and belongs to the technical field of artificial freezing construction of underground engineering. The segmented control type liquid nitrogen freezer is composed of a vertical return gas steel pipe and liquid supply pipes winding outside the return gas steel pipe in a segmented mode. The upper end of each segmented liquid supply pipe is connected with a ground liquid nitrogen supply system through heat insulation vertical pipes arranged in the return gas pipe, and the lower ends of the liquid supplypipes are directly connected into the return gas pipe to form a liquid nitrogen circulation system. During the freezing construction, liquid nitrogen can be poured into different segmented liquid supply pipes separately through the heat insulation vertical pipes, and nitrogen gas is discharged into the atmosphere along the return gas steel pipe to complete the freezing process. The segmented control type liquid nitrogen freezer realizes the control over the freezing effects in different segment ranges and an independent liquid supply method between the liquid supply pipes of different segments, and can control the start and end freezing time of each segment separately according to the construction needs, so as to realize segmented differential freezing of a stratum and precisely control the freezing process of the liquid nitrogen.
本发明公开了一种分段控制式液氮冻结器及工作方法，适用于地下工程的人工冻结施工技术领域，由竖直回气钢管及分段缠绕在回气钢管外的供液管组成，每段供液管的上端通过布置在回气管内的隔热竖直管与地面液氮供应系统连接，而供液管的下端直接接入回气管内，构成液氮循环系统。冻结施工时，液氮可通过隔热竖直管分别灌入不同的分段供液管内，氮气都沿回气钢管排入大气中，完成冻结过程。其实现控制不同分段范围内的冻结效果，不同分段供液管之间的独立供液方式，可以根据施工需要分别控制各分段的开始和结束冻结时间，从而实现地层的分段差异冻结，精确控制液氮冻结过程。
Segmented control type liquid nitrogen freezer and working method
The invention discloses a segmented control type liquid nitrogen freezer and a working method, and belongs to the technical field of artificial freezing construction of underground engineering. The segmented control type liquid nitrogen freezer is composed of a vertical return gas steel pipe and liquid supply pipes winding outside the return gas steel pipe in a segmented mode. The upper end of each segmented liquid supply pipe is connected with a ground liquid nitrogen supply system through heat insulation vertical pipes arranged in the return gas pipe, and the lower ends of the liquid supplypipes are directly connected into the return gas pipe to form a liquid nitrogen circulation system. During the freezing construction, liquid nitrogen can be poured into different segmented liquid supply pipes separately through the heat insulation vertical pipes, and nitrogen gas is discharged into the atmosphere along the return gas steel pipe to complete the freezing process. The segmented control type liquid nitrogen freezer realizes the control over the freezing effects in different segment ranges and an independent liquid supply method between the liquid supply pipes of different segments, and can control the start and end freezing time of each segment separately according to the construction needs, so as to realize segmented differential freezing of a stratum and precisely control the freezing process of the liquid nitrogen.
本发明公开了一种分段控制式液氮冻结器及工作方法，适用于地下工程的人工冻结施工技术领域，由竖直回气钢管及分段缠绕在回气钢管外的供液管组成，每段供液管的上端通过布置在回气管内的隔热竖直管与地面液氮供应系统连接，而供液管的下端直接接入回气管内，构成液氮循环系统。冻结施工时，液氮可通过隔热竖直管分别灌入不同的分段供液管内，氮气都沿回气钢管排入大气中，完成冻结过程。其实现控制不同分段范围内的冻结效果，不同分段供液管之间的独立供液方式，可以根据施工需要分别控制各分段的开始和结束冻结时间，从而实现地层的分段差异冻结，精确控制液氮冻结过程。
Segmented control type liquid nitrogen freezer and working method
一种分段控制式液氮冻结器及工作方法
SHI RONGJIAN (author) / HUANG FENG (author) / YU MINGYUE (author) / LI YAPENG (author)
2020-04-10
Patent
Electronic Resource
Chinese
IPC:
E02D
FOUNDATIONS
,
Gründungen
Freezer with vertical variable freezing effect and working method
| European Patent Office | 2022