Artificial stratum freezing system and method for liquid nitrogen and saline water combined refrigeration
A combined refrigeration and liquid nitrogen technology, applied in soil protection, infrastructure engineering, construction, etc., can solve problems such as high cost, high energy consumption, and harsh storage and transportation conditions
Inactive Publication Date: 2020-12-04
HAINAN UNIVERSITY
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Problems solved by technology
However, the energy consumption of liquid nitrogen production and cooling process of liquid nitrogen freezing is too high, the storage and transportation conditions are harsh, and the cost is high, which restricts the wide application of liquid nitrogen freezing in engineering
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[0090] see figure 1 Shown:
[0091] The artificial formation freezing system of combined refrigeration of liquid nitrogen and brine provided by the present invention includes a liquid nitrogen evaporator 1, a brine pump and a distributor 2, an infusion pipeline 3 and a liquid return pipeline 4, wherein the liquid nitrogen evaporator 1 is provided with The coil, the infusion line 3 and the liquid return line 4 are all connected to the coil in the liquid nitrogen evaporator 1, the inlet end of the infusion line 3 is assembled at the bottom of the liquid nitrogen evaporator 1, and the outlet of the infusion line 3 end is inserted into the bottom of the freezing tube 5, the brine pump and distributor 2 are set on the infusion line 3, the outlet end of the return line 4 is set on the top of the liquid nitrogen evaporator 1, and the inlet end of the return line 4 is set On the top of the freezing pipe 5, the coil pipe in the liquid nitrogen evaporator 1, the infusion line 3 and the...
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Abstract
The invention discloses an artificial stratum freezing system and method for liquid nitrogen and saline water combined refrigeration. The freezing system comprises a liquid nitrogen evaporator, a saline water pump, a distributor, a liquid conveying pipeline and a liquid return pipeline, wherein a coil pipe is arranged in the liquid nitrogen evaporator, the liquid conveying pipeline and the liquidreturn pipeline are both communicated with the coil pipe in the liquid nitrogen evaporator, the inlet end of the liquid conveying pipeline is assembled at the bottom of the liquid nitrogen evaporator,the outlet end of the liquid conveying pipeline is inserted into the bottom of a freezing pipe, and the saline water pump and the distributor are arranged on the liquid conveying pipeline. The methodcomprises the steps of 1, system precooling; 2, refrigeration freezing; 3, maintenance freezing; 4, safety operation technical measures; 5, refrigeration system design; 6, freezing hole drilling construction; 7, freezing construction; 8, freezing pipe pulling out; and 9, frost heaving and thaw collapse control. The artificial stratum freezing system and method have the advantages that the construction period is short, the manufacturing cost is low, a compressor is not needed for refrigeration, and therefore electric energy is greatly saved, and the cost is saved.
Description
technical field [0001] The invention relates to an artificial formation freezing system and method, in particular to an artificial formation freezing system and method in which liquid nitrogen and brine are jointly refrigerated. Background technique [0002] At present, the freezing method is widely used in various projects such as mines, bridges, subway tunnels and emergency repairs, and has achieved good engineering results. Artificial formation freezing methods are mainly divided into indirect freezing methods (such as brine freezing) and direct freezing methods (such as liquid nitrogen freezing). The indirect freezing system is mainly composed of a freezing station system and a ground freezing system. The commonly used refrigerant in this system is liquid ammonia or freon, and the refrigerant is mostly calcium chloride. The refrigerant temperature is generally -20°C to -30°C. In the prior art, the freezing temperature can be changed by controlling the concentration of...
Claims
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Patent Timeline
Login to View More IPC IPC(8): E02D3/115
CPCE02D3/115
Inventor 胡俊曾晖佳琳
Owner HAINAN UNIVERSITY