Ground source heat pump ground source well backfill material and backfill method

A ground-source heat pump and ground-source well technology, applied in excavation, construction, infrastructure engineering, etc., can solve problems such as low thermal conductivity, uncompact backfill, increase initial investment, etc., and achieve high comprehensive thermal conductivity and high backfill density , Good heat exchange effect

Inactive Publication Date: 2018-05-22
DALIAN ZHONGYING ENERGY MANAGEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The backfill material of the ground source well in the ground source heat pump system is an important factor of the system. The backfill material has an impact on the heat transfer effect between the source side of the heat pump host and the soil. If the backfill material is not selected properly, the efficiency of the heat pump unit will be reduced and the well drilling will be increased. quantity, thereby increasing the initial investment
In the "Technical Specifications for Ground Source Heat Pump System Work", the backfill materials include 15-20% bentonite and 80%-20% SiO2 sand mixture. The thermal conductivity of these two backfills is too low, less than 1; another 30% concrete, The backfill material mixed with 70% SiO2 sand, but because the concrete is easy to solidify and has poor fluidity, construction is inconvenient
[0003] Some of the existing backfilling methods use natural backfilling, and some use grouting backfilling by placing the grouting pipe at the wellhead. These two methods are easy to block in the middle of the well, the air is not exhausted, the backfilling effect is poor, and the heat transfer effect is not good. Well, there are still a small number of bottom grouting and backfilling methods. Although it can solve the compactness problem, because it cannot control the speed of the grouting pipe upwards, the speed is too fast and the grouting nozzle is higher than the grout surface, and the backfill is not dense. If it is too slow, the grouting pipe will be buried in the well and cannot be pulled out

Method used

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  • Ground source heat pump ground source well backfill material and backfill method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Three kinds of backfilling materials are screened out through on-site backfilling and testing. The specific ratio of backfilling materials is as follows:

[0050] Backfill material ratio table

[0051] Material 1

Bentonite(1)

Quartz Sand(7)

Puree (2)

Material 2

Bentonite(3)

Quartz Sand(7)

Puree(0)

Material 3

cement (1)

Quartz Sand(7)

Puree (2)

[0052] Note: The numbers in brackets represent parts by volume

[0053] At the ground source heat pump construction site, after the ground source well is drilled, the volume of the backfill is obtained according to the volume of the drilled well and the volume of the U-shaped heat exchanger, and then calculated according to the volume ratio of the backfill of each component in the above table. The volume of each component, mix all the backfill materials together, place them in a mixer, add water and stir evenly, inject them into the ground source well through a gro...

Embodiment 2

[0065] A backfilling material for a ground source well of a ground source heat pump, comprising: bentonite, raw slurry, and quartz sand, and the volume ratios of the components are: bentonite: 2, raw slurry: 2, and quartz sand: 6. The quartz sand is 90 mesh, and the bentonite is sodium-based bentonite. After mixing the above raw materials, add water in a ratio of 1:1, and mix and stir at room temperature.

[0066] The above-mentioned backfill is made into a solid test block, placed for 24 hours, and then crushed. It can be seen intuitively that there are few internal gaps, high compactness, increased volume, and good expansion performance.

Embodiment 3

[0068] A ground source well backfilling method, the steps are as follows:

[0069] S1. Calculate the required filler volume, and add the filler to the mixer 1 in batches;

[0070] S2, the grouting pipe 3 is inserted into the bottom of the ground source well together with the double U heat exchanger 5;

[0071] S3, the grouting material is filled by back pressure grouting from the bottom of the deep well through the grouting pipe 3;

[0072] S4. Gradually lift the grouting pipe 3, and gradually discharge the original air and moisture in the well through the overflowing slurry;

[0073] S5. Until the grouting material flows out from the wellhead of the ground source, the backfilling of the entire deep well is completed.

[0074] Further, the method of lifting the grouting pipe 3 is a step-by-step lifting method, that is, the grouting pipe 3 is lifted by X meters from the bottom of the well in Y steps, each time by Z meters.

[0075] Further, the method for lifting the groutin...

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Abstract

The invention provides a ground source heat pump ground source well backfill material and a backfill method and belongs to the field of ground source well backfill construction. According to the technical scheme, the backfill material comprises 0.5-3 parts of bentonite, 0-2.5 parts of raw stock and 6-8 parts of quartz sand according to the volume ratio. According to the ground source heat pump ground source well backfill material and the backfill method, a ground source well backfilled through the backfill material and the backfill method is good in fluidity, more convenient to construct, highin backfill compactness and free of backfill void; the backfill material is high in comprehensive heat conductivity coefficient; a grouting material is subjected to back pressure grouting filling from the bottom of a deep well to top; original air and moisture in the well are discharged upwards gradually through overflow grout. The backfilled ground source well is not likely to be blocked, thorough in air exhaust, high in backfill compactness and better in heat exchange effect.

Description

technical field [0001] The invention belongs to the field of ground source well backfill construction, and in particular relates to a ground source heat pump ground source well backfill material and a backfill method. Background technique [0002] Ground source heat pump systems are increasingly active in the application of shallow ground energy, and are widely used in the fields of heating and air conditioning. The ground source well backfill material in the ground source heat pump system is an important factor in the system. The backfill material will affect the heat transfer effect between the source side of the heat pump host and the soil. If the backfill material is not selected properly, the efficiency of the heat pump unit will be reduced and the well drilling will be increased. quantity, thereby increasing the initial investment. In the "Technical Specifications for Ground Source Heat Pump System Work", the backfill materials include 15-20% bentonite and 80%-20% SiO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/06E02D17/12C04B28/00C04B111/70
CPCE02D17/06C04B28/001C04B2111/00146C04B2111/00663C04B2111/00724C04B2111/70C04B2201/32E02D17/12C04B14/06C04B18/16
Inventor 杜以臣谢飞马志勇
Owner DALIAN ZHONGYING ENERGY MANAGEMENT
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