CN106866081B - A kind of preparation method of earth source heat pump drilling backfilling material - Google Patents
A kind of preparation method of earth source heat pump drilling backfilling material Download PDFInfo
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- CN106866081B CN106866081B CN201710224769.5A CN201710224769A CN106866081B CN 106866081 B CN106866081 B CN 106866081B CN 201710224769 A CN201710224769 A CN 201710224769A CN 106866081 B CN106866081 B CN 106866081B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00025—Aspects relating to the protection of the health, e.g. materials containing special additives to afford skin protection
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00293—Materials impermeable to liquids
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The present invention provides a kind of preparation method of earth source heat pump drilling backfilling material, a kind of high performance ground heat exchanger backfilling material is made using industrial tailings, higher heat-conductive characteristic is made it have, while being had preferable mobility, water-retaining property, microdilatancy and stronger impermeability.It is made of the raw material of following parts by weight: 1.0 parts of portland cement, 0-0.3 parts of flyash, 0.1-0.3 parts of slag micro powder, 0-0.01 parts of defoaming agent, 0.05-0.15 parts of swelling agent, 0.05-0.15 parts of bentonite, 0.002-0.020 parts of water-reducing agent, 1.0-3.0 parts of steel slag fine aggregate, 0.27-0.60 parts of water.Preferably economic, the social and obvious environment benefit obtained.Step is simple and convenient to operate, is practical.
Description
Technical field
The invention belongs to earth source heat pump field, in particular to a kind of preparation method of earth source heat pump drilling backfilling material.
Background technique
Earth source heat pump is that earth surface geothermal resource is utilized as Cooling and Heat Source, carries out the heating air conditioning of energy exchange
System.Geothermal energy resources are to have a large capacity and a wide range, and are a kind of clean renewable energy.Researchers are commonly held that, in current and general
Come, it is the important form of geothermal utilization that geothermal heat pump air-conditioning system, which is most promising energy saver and system,.Backfill is buried
Important link in heat exchange of heat pipe work progress, i.e., finish in drilling, under after complete U-tube, backfilling material is injected into drilling.
It is between the pipe laying and the wall of a borehole of ground heat exchanger, for enhancing the heat exchange of pipe laying and surrounding ground；Backfilling material
Selection and correctly backfill construction are for guaranteeing that the performance of ground heat exchanger has important meaning.
Earth source heat pump needs to drill in the earth formation, and aperture is generally between 102mm to 152mm, and hole depth is in 60m to 100m.
A high density polyethylene (HDPE) U-tube being placed in drilling is used as the circulation duct of collection hot fluid, last boring pumpability
Slurry backfill.Backfilling material is the Heat transmission medium between heat exchanger and surrounding formation.In the certain situation of strata condition
Under, it is desirable that drilling depth and thus just mounting cost is dependent on the thermal conduction characteristic of backfilling material to bring.
Backfilling material is other than the requirement in terms of heat transfer, it is necessary to be reality it is available, it is environmental-friendly and compared with
Low cost since the bore diameter of ground heat exchanger is smaller, and is furnished with U-tube some or double u-tube, gives backfilling material
Pumping bring great challenge, this requires it has preferable mobility and water-retaining property.Cement-based material can be changed
Contraction and dry contraction are learned, causes to generate gap between U-tube, this will cause these between backfilling material and stratum ground
Thermal contact resistance between contact surface increases, and influences heat-transfer effect, and this requires backfilling materials should have microdilatancy and well
It is bonded with U-tube and surrounding formation, reduces thermal contact resistance to the greatest extent.Backfilling material is not only the medium of heat transfer, simultaneously
Or sealing material, it is desirable that it has lower permeability, avoids pollution and underground different water cut of the surface water to underground water
Cross contamination between layer.The purpose of this project research is exactly that a kind of high performance underground pipe heat exchange is made using industrial tailings
Device backfilling material makes it have higher heat-conductive characteristic, while having preferable mobility, water-retaining property, microdilatancy and relatively strong
Impermeability.
Backfilling material is the Heat transmission medium between heat exchanger and surrounding formation.In the case where strata condition is certain,
It is required that drilling depth and thus just mounting cost is dependent on the thermal conduction characteristic of backfilling material to bring.But it is existing
Backfilling material thermal conductivity needs further increase, and higher cost.
Summary of the invention
In order to overcome above-mentioned deficiency, the present invention provides a kind of preparation method of earth source heat pump drilling backfilling material.Effectively benefit
Wear into that micro mist is active with steel slag, feature at low cost and high thermal coefficient, by the rational design of match ratio and a large amount of
Experiment, having prepared thermal coefficient can be up to 2.49W/mK, while having excellent workability, microdilatancy, impermeability excellent
Backfilling material.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of earth source heat pump drilling backfilling material, is made of: 1.0 parts of portland cement, fine coal the raw material of following parts by weight
0-0.3 parts grey, 0.1-0.3 parts of slag micro powder, 0-0.01 parts of defoaming agent, 0.05-0.15 parts of swelling agent, bentonite 0.05-0.15
Part, 0.002-0.020 parts of water-reducing agent, 1.0-3.0 parts of steel slag fine aggregate, 0.27-0.60 parts of water.
Preferably, it is made of the raw material of following parts by weight: 1.0 parts of portland cement, 0-0.15 parts of flyash, slag micro powder
0.1-0.2 parts, 0-0.005 parts of defoaming agent, 0.05-0.10 parts of swelling agent, 0.05-0.10 parts of bentonite, water-reducing agent 0.002-
0.010 part, 1.0-2.0 parts of steel slag fine aggregate, 0.27-0.45 parts of water.
Preferably, be made of the raw material of following parts by weight: 1.0 parts of portland cement, 0.15-0.3 parts of flyash, steel slag are micro-
0.2-0.3 parts of powder, 0.005-0.01 parts of defoaming agent, 0.10-0.15 parts of swelling agent, 0.10-0.15 parts of bentonite, water-reducing agent
0.010-0.020 parts, 2.0-3.0 parts of steel slag fine aggregate, 0.45-0.60 parts of water.
Preferably, the portland cement is ordinary portland cement, Portland fly ash cement, pozz portland water
Mud, portland slag cement or composite Portland cement；Strength grade >=42.5 of the portland cement.
Preferably, the flyash is II grades and the above flyash.
Preferably, the specific surface area of the slag micro powder is 350-500kg/m3, 0.08mm tail over percentage composition≤
5.0%.
Preferably, partial size≤1.18mm of the steel slag fine aggregate.
Preferably, the viscosity of the defoaming agent is greater than 800Pa.s；
Preferably, the swelling agent is UEA swelling agent, in water 7d limited expansion rate >=0.025%；
Preferably, the bentonite is calcium base or sodium bentonite, expansion capacity >=20ml/g；
Preferably, the water-reducing agent be how to be or polycarboxylate water-reducer water-reducing rate >=20%.
The present invention also provides a kind of preparation methods of earth source heat pump drilling backfilling material, comprising:
Cement, flyash, slag micro powder, steel slag aggregate and powdered additive is proportionally dry-mixed uniform, water is added and stirs
It is uniform to slurry to mix 2-4min, add liquid additive stir 2-4min to uniformly to get；
The additive includes: bentonite (powdery), defoaming agent (powdery), swelling agent (powdery), water-reducing agent (powdery or liquid
Body).
The present invention also provides application of the above-mentioned backfilling material in geothermal heat pump air-conditioning system construction.
Beneficial effects of the present invention
One, economic benefit:
It is energy-efficient, the initial cost and operating cost of ground-source heat pump system is effectively reduced.
1) the thermal resistance reduction 20%-40% that drills can be made using this technology backfilling material, effectively improves energy-saving effect, is reaching
In the case where identical energy-saving effect, the initial cost of system and operating cost can be made to be effectively reduced, there is significant economic benefit.
2) industrial by-products steel slag is utilized, is effectively reduced cost.
Two, social benefit: obvious environment benefit
1) impervious requirement is proposed, it is therefore prevented that the surface water is by drilling to subsurface wastewater infiltration system, to protect underground water not by ground
The pollution of table pollutant, and prevent the cross contamination between each aquifer.
2) earth source heat pump is a kind of sustainable development " green device ", the selection of backfilling material and correctly backfill
It constructs for guaranteeing that the performance of ground heat exchanger has important meaning, meets the strategy of sustainable development.
3) industrial by-products steel slag is utilized, the discharge of solid waste is reduced, there is significant social benefit.
4) preparation method of the present invention is simple, raw material is easy to get, is practical, easy to spread.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
The purpose of the present invention one:
The present invention is effectively utilized steel slag and wears into that micro mist is active, feature at low cost and high thermal coefficient, by matching
The rational design of composition and division in a proportion and many experiments, having prepared thermal coefficient can be up to 2.49W/mK, while having excellent application property
Energy, microdilatancy, impervious excellent backfilling material.
Technical solution of the present invention:
Formula:
The thin bone of common portland cement, flyash, slag micro powder, defoaming agent, swelling agent, bentonite, water-reducing agent, steel slag
Material, water.
The above components mass ratio are as follows: 1:0-0.3,0.1-0.3,0-0.01,0.05-0.15,0.05-0.15,0.002-
0.020,1-3.0,0.27-0.60。
Cement: ordinary portland cement, Portland fly ash cement, portland-pozzolan cement, portland slag cement,
One of composite Portland cement, strength grade >=42.5.
Flyash: II grades and the above flyash；
Slag micro powder: 0.08mm tails over percentage composition≤5.0%, specific surface area 350-500kg/m3；
Defoaming agent: nontoxic, tasteless, viscosity is greater than 800Pa.s；
Swelling agent: UEA swelling agent, limited expansion rate >=0.025 7d in water；
Bentonite: calcium base or sodium bentonite, expansion capacity >=20ml/g；
How water-reducing agent: being or polycarboxylate water-reducer water-reducing rate >=20%；
Steel slag fine aggregate: partial size≤1.18mm, grading of aggregates need to meet the following table 1 requirement.
Table 1
| Screen size/mm | It is accumulative to tail over/% |
| 1.18 | 0 |
| 0.6 | 40-16 |
| 0.3 | 85-55 |
| 0.15 | 90-100 |
Water: clean tap water.
The additive of cement, flyash, slag micro powder, steel slag aggregate and powdery is proportionally dry-mixed uniform, water is added
It is uniform to slurry to stir 2-4min, adds liquid additive and stirs 2-4min to uniform.
Properties of product of the invention:
Fluidity: initial: >=280mm, 30min >=260mm
Compression strength: 28d >=45Mpa
Water retention: >=95%
Seepage-resistant grade: >=P8
Thermal coefficient: 2.00-2.49W/ (mK)
Vertical expansion ratio: 3h >=0.02%
For 24 hours with 3h difference 0.02-0.5%
Embodiment 1
Raw material: common portland cement, flyash, slag micro powder, defoaming agent, swelling agent, bentonite, water-reducing agent, steel
Slag fine aggregate, water.
The above components mass ratio are as follows: 1,0.2,0.2,0.01,0.08,0.05,0.004,1.5,0.43.
Cement: ordinary portland cement, strength grade 52.5.
Flyash: I grades of flyash
Slag micro powder: 0.08mm tails over percentage composition 0.6%, specific surface area 450kg/m3
Defoaming agent: organic silicon defoamer, nontoxic, tasteless, viscosity 1500Pa.s.
Swelling agent: UEA swelling agent, 7d limited expansion rate 0.04% in water.
Bentonite: sodium bentonite, expansion capacity 40ml/g.
Water-reducing agent: polycarboxylate water-reducer, water-reducing rate 25%.
Aggregate: partial size≤1.18mm, grading of aggregates are shown in Table 2 requirements.
Table 2
| Screen size/mm | It is accumulative to tail over/% |
| 1.18 | 0 |
| 0.6 | 26 |
| 0.3 | 70 |
| 0.15 | 96 |
Water: clean tap water.
The additive of cement, flyash, aggregate and powdery is dry-mixed uniformly, and addition water stirring 2-4min is uniform to slurry,
It adds liquid additive and stirs 2-4min to uniform.
Properties of product:
Fluidity: initial: 300mm, 30min:280mm
Compression strength: 28d=85.2Mpa
Vertical expansion ratio: 3h:0.04%
For 24 hours with 3h difference 0.05%
Water retention: 99%
Seepage-resistant grade: P10
Thermal coefficient: 2.49W/ (mK)
Embodiment 2:
Raw material: common portland cement, flyash, slag micro powder, defoaming agent, swelling agent, bentonite, water-reducing agent, steel
Slag fine aggregate, water.
The above components mass ratio are as follows: 1:0.3,0.3,0.005,0.08,0.08,0.008,1.5,0.55.
Cement: ordinary portland cement, strength grade 42.5.
Flyash: II grades of flyash
Slag micro powder:: 0.08mm tails over percentage composition 1.0%, specific surface area 390kg/m3
Defoaming agent: organic silicon defoamer, nontoxic, tasteless, viscosity 1000Pa.s.
Swelling agent: UEA swelling agent, 7d limited expansion rate 0.03% in water.
Bentonite: calcium-base bentonite, expansion capacity 20ml/g.
Water-reducing agent: how based water reducer, water-reducing rate 20%.
Steel slag fine aggregate: partial size≤1.18mm, grading of aggregates are shown in Table 3 requirements.
Table 3
| Screen size/mm | It is accumulative to tail over/% |
| 1.18 | 0 |
| 0.6 | 30 |
| 0.3 | 75 |
| 0.15 | 98 |
Water: clean tap water.
The additive of cement, flyash, aggregate and powdery is dry-mixed uniformly, and addition water stirring 2-4min is uniform to slurry,
It adds liquid additive and stirs 2-4min to uniform.
Properties of product:
Fluidity: initial: 305mm, 30min:285mm
Compression strength: 28d=58.8Mpa
Vertical expansion ratio: 3h:0.03%
For 24 hours with 3h difference 0.08%
Water retention: 98%
It is impervious: P8
Thermal coefficient: 2.20W/ (mK)
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Claims (3)
- The backfilling material 1. a kind of earth source heat pump drills, which is characterized in that be made of the raw material of following parts by weight: portland cement 1.0 parts, 0.2 part of flyash, 0.2 part of slag micro powder, 0.01 part of defoaming agent, 0.08 part of swelling agent, 0.05 part of bentonite, diminishing 0.004 part of agent, 1.5 parts of steel slag fine aggregate, 0.43 part of water；The specific surface area of the slag micro powder is 350-500kg/m3, 0.08mm tails over percentage composition≤5.0%；The partial size of the steel slag fine aggregate is less than or equal to 1.18mm；The portland cement is ordinary portland cement, Portland fly ash cement, portland-pozzolan cement, slag silicate Salt cement or composite Portland cement；The strength grade of the portland cement is more than or equal to 42.5；The swelling agent is UEA swelling agent, and 7d limited expansion rate is more than or equal to 0.025% in water；The viscosity of the defoaming agent is greater than 800Pa.s；The bentonite is calcium base or sodium bentonite, and expansion capacity is more than or equal to 20ml/g；The water-reducing agent is naphthalene system or polycarboxylate water-reducer, and water-reducing rate is more than or equal to 20%.
- 2. a kind of preparation method of earth source heat pump drilling backfilling material described in claim 1 characterized by comprisingPortland cement, flyash, slag micro powder, steel slag fine aggregate and powdered additive is proportionally dry-mixed uniform, it is added Water stir 2-4min it is uniform to slurry, add liquid additive stir 2-4min to uniformly to get；The powdered additive is bentonite, defoaming agent, swelling agent；The liquid additive is water-reducing agent.
- 3. application of the backfilling material described in claim 1 in geothermal heat pump air-conditioning system construction.
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| CN107500672B (en) * | 2017-09-26 | 2020-09-11 | 沈阳建筑大学 | High-heat-conductivity bending-resistant cement-based material for floor heating integration and preparation method thereof |
| CN108069728B (en) * | 2018-02-01 | 2021-05-11 | 济南大学 | Preparation method of steel slag-fly ash wrapped polyphenyl particle light heat insulation board |
| CN110512824B (en) * | 2019-09-27 | 2021-06-04 | 河南人邦科技股份有限公司 | Floor heating backfill process, special material and preparation method thereof |
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| CN104402349A (en) * | 2014-10-23 | 2015-03-11 | 山东建筑大学 | Ground-source heat pump ground-buried pipe backfill material and preparation method thereof |
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| CN100395209C (en) * | 2006-04-17 | 2008-06-18 | 山东建筑大学 | Underground pipe heat exchanger hole drilling refilling material |
| CN101480814B (en) * | 2009-02-17 | 2011-03-16 | 同济大学 | Method for preparing cement-based grout and mortar for backfilling earth source heat pump underground penstock |
| CN102351475B (en) * | 2011-07-11 | 2012-11-21 | 北京圣兆科技开发有限公司 | Grouting backfill material special for ground source heat pump |
| CN103803900B (en) * | 2013-12-24 | 2016-01-20 | 甘肃土木工程科学研究院 | A kind of soil source heat pump vertical buried pipe boring backfilling material |
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| CN104402349A (en) * | 2014-10-23 | 2015-03-11 | 山东建筑大学 | Ground-source heat pump ground-buried pipe backfill material and preparation method thereof |
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| Title |
|---|
| "地源热泵系统中水泥基灌浆材料性能优化";邹玲等;《水文地质工程地质》;20130715;第40卷(第4期);摘要第2-4行、第134页左栏倒数第1-3、5-8行和右栏第3-5、17行 |
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