RU2634765C1 - System for cooling and freezing soil - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: system including the installation of underground heat exchangers with a liquid coolant with a freezing point below zero degrees centigrade (brine) is described, characterized in that cryopegs are used as a liquid coolant, a cryopeg being fed to freezing columns from the cryolithozone into the heat exchangers. Spent cryopegs can be forcibly discharged to the cryolithozone massif. The outer part of the circulation circuit can be thermally insulated. The technical result of profitability increase is achieved by the absence of energy-consuming refrigerating machines and by the absence of the need to prepare a special cooling solution. The technical result of reliability increase is achieved by reducing the number of system components, the failure probability of each of which differs from zero. The technical result of operation stability increase is achieved by the temperature stability of the cryopeg, the total amount of which considerably exceeds the amount of the cryopeg used during the season. The invention can be successfully applied in the construction of industrial and civil buildings.

EFFECT: increasing the economy, reliability and stability of operation.

3 cl, 1 dwg

Description

The invention relates to systems for cooling and freezing soils in mining engineering in the areas of permafrost distribution (permafrost zone), characterized by the presence of natural brines with negative temperatures (cryopegs).

The well-known "System of freezing soils" RU 2435904 [2], containing wells drilled equidistantly along the output or pit contour, freezing columns are lowered into the wells, and supply pipes are placed in them, brine cooled at the freezing station is circulating in the columns, collectors connecting the exit of the freezing columns with a freezing station, a salt solution of calcium chloride is used as a brine, the brine is cooled at freezing stations by refrigeration machines.

The disadvantage of this device is the presence of an energy-consuming freezing station.

The closest technical solution is the "Method for installing a slab foundation on piles for a reservoir with a low-temperature product" RU 2552253 [1], which rests on a pile field, cooled by additional freezing of the permafrost mass, additional freezing of the permafrost soil with piles is carried out by means of forced thermoelements by the method of forced controlled feeding in them the refrigerant of a predetermined temperature from an external source of its cooling along the looped distribution lines .

The device has greater efficiency compared to [2] due to the presence of the possibility of using natural cooling.

The disadvantage is the low efficiency due to the use of energy-intensive chillers. The disadvantage is the low reliability and stability of the cooling device.

On the territory of permafrost developed surface (oceans, seas and lakes) and underground cryopegs. The temperature of underground permafrost cryopegs reaches - (30-40) ºС, inter-permafrost - (2-12) ºС, permafrost (0-5) ºС.

Salty groundwater and brines during the cooling of the climate acquired negative temperatures, turned into cryopegs. Due to the large reserves of cold in them, remaining in the liquid phase, they actively affect the intensive cooling of the rocks, anomalously increasing the thickness of the cryogenic part of the section. Such peculiar natural “refrigerating machines” of the Siberian platform containing cryopegs are the Verkhnevilyuyskoye, Verkhne-Markhinskoye and Turukhanskoye uplifts, the Putorana volcanogenic massif and others, within which deposits of hydrocarbons, diamonds and precious metals are concentrated.

The objective of the invention is to increase the efficiency of the system through the use of natural cryogenic resources - brines with negative temperatures (cryopegs) lying in the permafrost zone, considered as a natural refrigeration machine.

The technical result of the invention is to increase efficiency, reliability and stability.

The technical result is achieved by the fact that the system for cooling and freezing soils, including the installation of underground heat exchangers with a liquid coolant with a freezing temperature below zero degrees Celsius (brine), is characterized by the fact that cryopegs are used as the liquid coolant, and the cryopag is supplied to the freezing columns from cryolithozones in heat exchangers.

Spent cryopegs can be forcibly discharged into the cryolithozone massif, which will increase environmental friendliness and increase the life of the system due to the renewal of the refrigeration resource of the cryopeg deposit.

The outer part of the circulation circuit can be thermally insulated, which will reduce the heating of the cryopeg in the summer and protect the cryopeg from critical cooling in the winter.

An example implementation of the system is schematically shown in the drawing, where

1 - cryolithozone;

2 - horizon of cryopegs;

3 - the upper boundary of the permafrost zone;

4 - level of static pressure of cryopegs;

5 - creep feed well;

6 - filter;

7 - deep pump;

8 - pipeline supplying cryopag;

9 - reservoir;

10 - main pump;

11 - collector supplying a cryopeg;

12 - freezing wells;

13 - a collector collecting the spent cryopag;

14 - pipeline;

15 - tank;

16 - pump;

17 - pipeline;

18 - well pumping spent cryopag;

19 - heat insulator.

The system operates as follows: from the aquifer of the cryopegs 2, located below the level of the static pressure of the cryopegs 4, containing natural natural brines – cryopegs of the cryolithozone 1, through a well 5 having a filter 6, it is pumped through a pipe 8 to a reservoir 9 using a pump 7 and a pump 10, the collector 11 is filled, from which the cryopeg enters the freeze wells 12. The spent cryopegs are delivered to the collector 13, then through the pipe 14 to the reservoir 15, and the pump 16 is fed through the pipe 17 to the injection cryopegs ayutsya through hole 18 in the array Cryolithozone 1 comprising cryopeg 2. To ensure normal operation of the circulation circuit 19. The upper limit Insulate Cryolithozone designated pos.3.

EFFECT: increased efficiency is achieved by the absence of energy-consuming refrigerating machines and due to the absence of the need to prepare a special cooling solution. EFFECT: increased reliability is achieved by reducing the number of system components, the probability of failure of each of which differs from zero. EFFECT: increased stability of work is achieved by the temperature stability of the cryopag, the total amount of which significantly exceeds the amount of the cryopag used during the season.

Industrial application: the invention can be successfully applied in the construction of industrial and civil structures.

Claims (3)

1. A system for cooling and freezing soils, including the installation of underground heat exchangers with a liquid coolant with a freezing temperature below zero degrees Celsius, characterized in that cryopegs are used as a liquid coolant, and the cryopag is supplied to freezing columns from the permafrost zone to the heat exchangers. 2. The system according to claim 1, characterized in that the spent cryopegs are forcibly discharged into the cryolithozone array. 3. The system according to claim 2, characterized in that the outer part of the circulation circuit is thermally insulated.

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