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Buried pipe backfill material for ground source heat pump

A technology of ground source heat pumps and raw materials, applied in the field of ground source heat pumps, can solve the problems of secondary environmental pollution and high preparation costs, and achieve the effects of improving construction performance, improving cost performance, and reducing emissions

Inactive Publication Date: 2017-10-27
HEBEI JIASHICHENG ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, in the existing technology, quartz sand is used as aggregate, and the buried pipe backfill material is prepared through aggregate gradation control, admixture and other technical means, but the preparation cost is high, and the existing buried pipe backfill material is obtained by adding Metal waste is used to improve its heat transfer performance, so buried underground will cause secondary pollution to the environment, so the comprehensive performance of existing buried pipe backfill materials needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A ground-source heat pump backfill material for buried pipes, comprising the following raw materials in parts by weight: 20 parts of Portland cement, 10 parts of fly ash, 10 parts of polylactic acid, 8 parts of magnesium oxide, 3 parts of defoaming agent, and 2 parts of expansion agent parts, 20 parts of modified bentonite, 3 parts of water reducing agent, 20 parts of aggregate and water;

[0021] The Portland cement is at least one of ordinary Portland cement, fly ash Portland cement, pozzolan Portland cement, slag Portland cement and composite Portland cement.

[0022] The strength grade of the Portland cement is greater than or equal to 42.5.

[0023] The aggregate consists of quartz sand tailings and granite chips or consists of granite chips.

[0024] The modified bentonite is a mixture obtained by adding water to the purified and thermally modified natural bentonite clay.

[0025] The preparation method of the modified bentonite is as follows: take the natural b...

Embodiment 2

[0031] A ground-source heat pump backfill material for buried pipes, comprising the following raw materials in parts by weight: 20-40 parts of Portland cement, 13 parts of fly ash, 18 parts of polylactic acid, 10 parts of magnesium oxide, 10 parts of defoaming agent, expansion 3 parts of agent, 25 parts of modified bentonite, 10 parts of water reducing agent, 30 parts of aggregate and water;

[0032] The Portland cement is at least one of ordinary Portland cement, fly ash Portland cement, pozzolan Portland cement, slag Portland cement and composite Portland cement.

[0033] The strength grade of the Portland cement is greater than or equal to 42.5.

[0034] The aggregate consists of quartz sand tailings and granite chips or consists of granite chips.

[0035] The modified bentonite is a mixture obtained by adding water to the purified and thermally modified natural bentonite clay.

[0036] The preparation method of the modified bentonite is as follows: take the natural bento...

Embodiment 3

[0042] A ground-source heat pump backfill material for buried pipes, comprising the following raw materials in parts by weight: 40 parts of Portland cement, 15 parts of fly ash, 22 parts of polylactic acid, 15 parts of magnesium oxide, 18 parts of defoaming agent, and 4 parts of expansion agent parts, 30 parts of modified bentonite, 15 parts of water reducing agent, 50 parts of aggregate and water;

[0043] The Portland cement is at least one of ordinary Portland cement, fly ash Portland cement, pozzolan Portland cement, slag Portland cement and composite Portland cement.

[0044] The strength grade of the Portland cement is greater than or equal to 42.5.

[0045] The aggregate consists of quartz sand tailings and granite chips or consists of granite chips.

[0046] The modified bentonite is a mixture obtained by adding water to the purified and thermally modified natural bentonite clay.

[0047] The preparation method of the modified bentonite is as follows: take the natura...

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Abstract

The invention discloses a buried pipe backfill material for a ground source heat pump. The buried pipe backfill material is characterized by preparing from the following raw materials in parts by weight: 20-40 parts of silicate cement, 30-50 parts of industrial tailings, 10-15 parts of coal ash, 10-22 parts of polylactic acid, 8-15 parts of magnesium oxide, 3-18 parts of a de-foaming agent, 2-4 parts of an expanding agent, 20-30 parts of modified bentonite, 3-15 parts of a water reducer, 20-50 parts of aggregates and water. The raw materials utilize industrial tailings, so that emission of solid waste is reduced; moreover, an additive technology is increased, so that construction performance, heat conduction and impermeability of the material are further improved, production cost is reduced and cost performance of the backfill material is improved. The used materials easily obtained, so that cost is relatively low, and pollution on environment is not generated.

Description

technical field [0001] The invention belongs to the field of ground source heat pumps, and in particular relates to a ground buried pipe backfill material for ground source heat pumps. Background technique [0002] Ground source heat pump is a heating and air conditioning system that uses the shallow geothermal resources on the earth's surface as a cold and heat source for energy exchange. Geothermal resources are large in quantity and wide in scope, and are a clean and renewable energy source. Researchers generally believe that at present and in the future, ground source heat pump air conditioning system is the most promising energy-saving device and system, and is an important form of geothermal utilization. Backfilling is an important link in the construction process of the buried tube heat exchanger, that is, after the drilling is completed and the U-shaped tube is lowered, the backfilling material is injected into the borehole. It is between the buried pipe and the bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B28/02C04B28/08
CPCC04B28/04C04B28/021C04B28/08C04B2111/00017C04B18/08C04B24/06C04B14/304C04B2103/50C04B2103/0068C04B14/104C04B2103/302C04B22/002C04B14/048C04B18/12
Inventor 白莉莉
Owner HEBEI JIASHICHENG ENERGY TECH CO LTD