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Mixed filler formula for heat transfer of ground heat exchanger

A technology of buried pipe heat exchanger and mixed filler, which is applied in the field of physical heat transfer, can solve the problems of affecting cementing quality, increasing cementing cost, unsatisfactory heat exchange effect of buried pipe heat exchanger, etc. Heat transfer effect, saving cementing cost and improving cementing quality

Inactive Publication Date: 2020-07-14
中国能源建设集团华北电力试验研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Filler cementing is usually used between the ground rock well and the outer tube of the heat exchanger. However, the thermal conductivity of ordinary concrete filler in the mixed filler used at this stage is lower than that of the rock, which cannot meet the heat transfer requirements of the buried tube heat exchanger, resulting in The heat transfer effect of the borehole heat exchanger is not ideal, and when it is used in fractured geology, there will be leakage, which will affect the cementing quality and increase the cementing cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A mixed filler formula for heat transfer in buried tube heat exchangers, the composition of which is as follows in parts by weight:

[0029] cement 100;

[0030] Freshwater 45;

[0031] sand 35;

[0032] Citric acid 0.5;

[0033] Silica fume 4;

[0034] Class 1 fly ash 20;

[0035] Naphthalene-based water reducer 1;

[0036] Rosin soap air-entraining agent 0.01;

[0037] Graphite 0.5;

[0038] Toughened fiber leak-proof agent for oil well cement 2.3.

[0039] The cement adopts PO32.5 grade fly ash Portland cement with a fineness of 0.2%.

[0040] The particle size of the sand is 0.3 mm.

[0041] First, mix cement, sand, fresh water, citric acid and first-grade fly ash to make cement slurry according to the above formula, and then add naphthalene-based water reducer, silica fume, rosin soap air-entraining agent, graphite and BCE-210L toughened fiber leak-proof agent for oil well cement, the water-cement ratio is 0.54, it can be cemented after fully stirring.

Embodiment 2

[0043] A mixed filler formula for heat transfer in buried tube heat exchangers, the composition of which is as follows in parts by weight:

[0044] cement 100;

[0045] Freshwater 58;

[0046] sand 38;

[0047] tartaric acid 2;

[0048] Silica fume 6;

[0049] Class 1 fly ash 20;

[0050] Melamine-based water reducer 1;

[0051] Alkylbenzenesulfonate air-entraining agent 0.02;

[0052] graphite2;

[0053] Toughened fiber leak-proof agent for oil well cement 2.3.

[0054] The cement adopts PO32.5 grade fly ash Portland cement with a fineness of 0.2%.

[0055] The particle size of the sand is 0.5 mm.

[0056] First, mix cement, sand, fresh water, tartaric acid and primary fly ash to make cement slurry according to the above formula, and then add melamine-based water reducer, silicon powder, alkylbenzene sulfonate air-entraining agent, Graphite and BCE-210L oil well cement toughened fiber anti-leakage agent, the water-cement ratio is 0.54, and the cementing can be carri...

Embodiment 3

[0058] A mixed filler formula for heat transfer in buried tube heat exchangers, the composition of which is as follows in parts by weight:

[0059] cement 100;

[0060] Freshwater 48;

[0061] sand 36;

[0062] Gluconic acid 1.5;

[0063] Silica fume 5;

[0064] Class 1 fly ash 20;

[0065] Naphthalene-based water reducer 1;

[0066] Alkylbenzenesulfonate air-entraining agent 0.015;

[0067] Graphite 1.5;

[0068] Toughened fiber leak-proof agent for oil well cement 2.3.

[0069] The cement adopts PO32.5 grade fly ash Portland cement with a fineness of 0.2%.

[0070] The particle size of the sand is 0.4 mm.

[0071] First, mix cement, sand, fresh water, gluconic acid and primary fly ash to make cement slurry according to the above formula, and then add naphthalene-based water reducer, silicon powder, and alkylbenzene sulfonate air-entraining agent according to the above-mentioned parts by weight , graphite and BCE-210L oil well cement toughening fiber anti-leakage ag...

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Abstract

The invention relates to a mixed filler formula for heat transfer of a ground heat exchanger. The mixed filler formula comprises the following components in parts by weight: 100 parts of cement; 45-58parts of fresh water; 35-38 parts of sand; 0.5-2 parts of retarder; 4-6 parts of silicon powder; 20 parts of fly ash; 1 part of a water reducing agent; 0.01-0.02 parts of an air entraining agent; 0.5-2 parts of graphite; and 2.3 parts of a toughening fiber anti-leakage agent. The mixed filler has a relatively high heat conductivity coefficient; the heat transfer requirement of the ground heat exchanger in a geothermal well cementing filler is met; the heat transfer effect of the ground heat exchanger is improved; the water reducing agent, the air entraining agent, the graphite and the toughening fiber leakage-proof agent are added, the physical property of the mixed filler is modified and optimized, the requirement for rapid well cementation is met, when the mixed filler is used in fractured geology, the purpose of plugging cracks and pores is achieved through the friction, hanging resistance and retention effects between the mixed filler and the pores and between the mixed filler andthe walls of the cracks, the leakage phenomenon is avoided, the well cementation quality is improved, and meanwhile the well cementation cost is saved.

Description

technical field [0001] The invention relates to the technical field of physical heat transfer, in particular to a mixed filler formula for heat transfer of buried pipe heat exchangers. Background technique [0002] The medium-deep ground rock heat exchanger is a device that indirectly extracts heat from underground soil, rock formations, and geothermal minerals. With the help of heat exchanger conduction, the heat energy deep underground is exported, and heat is supplied to ground buildings through special equipment systems. The medium-deep ground rock heat exchanger does not directly extract groundwater, and there is no problem of tail water recharge. It extracts heat from hot rocks by heat exchange, replacing shallow ground source wells and medium-deep hot water wells. [0003] The return water entering the medium-deep formation rock heat exchanger is gradually heated by the soil, thermal fluid, and rock outside the heat exchanger during the process of flowing downward ou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2111/00465C04B2201/32C04B22/002C04B14/068C04B2103/22C04B18/146C04B2103/302C04B2103/304C04B14/024C04B20/0048
Inventor 李心亮李耀德周竹军杨永伟葛占雨魏艳辉刘铮
Owner 中国能源建设集团华北电力试验研究院有限公司
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