CN110294620B - Low-thermal-resistance high-thermal-conductivity power cable fireproof gel material and preparation method thereof - Google Patents
Low-thermal-resistance high-thermal-conductivity power cable fireproof gel material and preparation method thereof Download PDFInfo
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- CN110294620B CN110294620B CN201910356885.1A CN201910356885A CN110294620B CN 110294620 B CN110294620 B CN 110294620B CN 201910356885 A CN201910356885 A CN 201910356885A CN 110294620 B CN110294620 B CN 110294620B
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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
- C04B28/34—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 cold phosphate binders
- C04B28/344—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 cold phosphate binders the phosphate binder being present in the starting composition solely as one or more phosphates
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
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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
- 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
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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
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
Abstract
The invention discloses a low-thermal-resistance high-thermal-conductivity power cable fireproof gel material and a preparation method thereof. It comprises bentonite, fine sand, lime powder, white latex, water, sodium tripolyphosphate and water glass. The low-thermal-resistance high-thermal-conductivity power cable fireproof gel material has good initial fluidity, so that the gel material is directly poured into a cable trench filled with cables during construction, flows freely like water, fills gaps between the cable trench and the gaps between the cables, fills the whole cable trench, and submerges the cables.
Description
The technical field is as follows:
the invention belongs to the field of cable construction, and particularly relates to a low-thermal-resistance high-thermal-conductivity power cable fireproof gel material and a preparation method thereof.
Background art:
since the existence of cables, a large number of expert technicians have been working on the safe operation of cables. Due to the technical limitation, a plurality of cables are densely laid in a cable trench, and most cables are not filled with a filling medium, and sand or concrete is preferably used as the filling medium. The laid cable is poor in heat dissipation, not only is the current-carrying capacity reduced, but also the cable is easy to catch fire, after the cable catches fire, the cable in the whole cable trench is easy to catch fire due to the fact that flame-retardant media are not arranged among the cables, and therefore large accidents such as fire disasters or large-scale power failure are caused, and the problems that white ants corrode, the cable trench is easy to enter water, small animals invade and the cable is stolen exist. The re-laying of these old cable ducts is costly. However, most of the existing filling media are solid, and the cables are used for refilling the media in the old cable ducts, so that the construction procedure is complex and the cost is very high.
For laying of a new cable trench, the existing filling material basically adopts a reinforced concrete technology, cement yellow sand or a pipeline is used for protecting the cable, and a plurality of defects exist. Such as material property defect, difficult maintenance and high line operation cost.
The invention content is as follows:
the invention aims to provide the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material which is low in thermal resistance, high in heat conductivity, non-combustible, high in stability, weak in alkaline, good in initial fluidity and environment-friendly.
The invention relates to a low-thermal-resistance high-thermal-conductivity power cable fireproof gel material which comprises bentonite, fine sand, lime powder, white latex, water, sodium tripolyphosphate and water glass.
Preferably, the water-based paint comprises, by mass, 100-120 parts of bentonite, 700-900 parts of fine sand, 10-12 parts of lime powder, 7-9 parts of white latex, 650-750 parts of water, 1-1.2 parts of sodium tripolyphosphate and 5-6 parts of water glass.
More preferably, the mortar comprises 110 parts of bentonite, 800 parts of fine sand, 11 parts of lime powder, 8 parts of white latex, 700 parts of water, 1.1 parts of sodium tripolyphosphate and 5.5 parts of water glass in parts by weight.
The fine sand is preferably 60-100 meshes of fine sand.
The second purpose of the invention is to provide a preparation method of the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material, which is characterized in that bentonite, fine sand and lime powder are mixed according to the components and the content to obtain a mixture A, then white emulsion and water are mixed and stirred uniformly to obtain a mixture B, sodium tripolyphosphate is added into the mixture B to be dissolved, then water glass is added to be stirred and mixed to obtain a mixture C, and the mixture A and the mixture C are mixed and stirred uniformly to obtain the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material.
The application method of the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material comprises the following steps:
the prepared low-thermal-resistance high-thermal-conductivity power cable fireproof gel material is poured into a cable trench with laid cables, for example, an old cable trench with the existing cables, and the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material has good initial fluidity, flows to the ground from a high position like water, and permeates into gaps between the cables and gaps between the cables, so that the whole cable trench is filled, and the filling height is 100mm higher than the surface of the cables. The low-thermal-resistance high-thermal-conductivity power cable fireproof gel material disclosed by the invention basically does not flow after one hour after being prepared and discharged, forms a gel state after 24 hours, and then is paved with a cement protective layer with the thickness of 2-4 cm on the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material, so that the gel-like low-thermal-resistance high-thermal-conductivity power cable fireproof gel material can be isolated from the air, the evaporation of water is avoided, and the condition of the product is kept stable for a long time.
According to the low-thermal-resistance high-heat-conductivity power cable fireproof gel material, through determination, the low-thermal-resistance high-heat-conductivity fireproof gel material is non-combustible and high in stability, so that heat can be well conducted and dissipated, the current-carrying capacity is improved, a fire disaster is avoided, and the whole cable trench can be prevented from being ignited due to the fact that one cable is ignited due to non-combustion. The low-thermal-resistance high-thermal-conductivity power cable fireproof gel material has good initial fluidity, so that the gel material is directly poured into a cable trench filled with cables during construction, flows freely like water, fills gaps between the cable trench and the gaps between the cables, fills the whole cable trench, and submerges the cables.
Description of the drawings:
FIG. 1 is a cable trench with previously densely laid cables;
FIG. 2 is a cable trench filled with the low thermal resistance high thermal conductivity power cable fire protection gel material of example 1;
fig. 3 is a 3 × 3 row pipe laying diagram.
The specific implementation mode is as follows:
the following examples are further illustrative of the present invention and are not intended to be limiting thereof.
Example 1:
first, preparation experiment
The raw materials comprise, by mass, 110 parts of bentonite, 800 parts of fine sand with 60-100 meshes, 11 parts of lime powder, 8 parts of white latex, 700 parts of water, 1.1 parts of sodium tripolyphosphate and 5.5 parts of water glass.
According to the components and the content, firstly, mixing bentonite, fine sand and lime powder to obtain a mixture A, then, mixing and stirring white latex and water uniformly to obtain a mixture B, then, adding sodium tripolyphosphate to the mixture B for dissolving, then, adding water glass, stirring and mixing to obtain a mixture C, and mixing and stirring uniformly the mixture A and the mixture C to obtain the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material, wherein the performance indexes are shown in table 1:
TABLE 1
2. Initial fluidity: the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material disclosed by the invention has very good initial fluidity, and flows like water, while the Chinese patent CN201010119201.5, a cable low-thermal-resistance protection filling medium and a preparation method thereof only have the initial fluidity like common concrete slurry. The low-thermal-resistance high-thermal-conductivity power cable fireproof gel material disclosed by the invention basically does not flow within one hour, and forms a gel after 24 hours. Therefore, the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material is particularly suitable for refilling filler of an old cable trench which is densely laid with cables but is not filled with filling medium, because the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material flows like water initially, gaps between the cable trench and the cables are filled, the whole cable trench is filled, and the cables are immersed, which cannot be reached by the cable low-thermal-resistance protection filling medium of the Chinese patent CN201010119201.5 and cannot flow like water.
3. Waterproof performance: the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material of the embodiment is detected by the national fire-fighting product quality supervision and inspection center (Guangdong) according to GB8624-2012 classification of building materials and preparation combustion performance, and the detection result is shown in Table 2:
TABLE 2
4. Termite penetration resistance: the testing method is characterized in that a Cantonese insect research institute is entrusted to perform termite penetration resistance testing on the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material of the embodiment, and the testing is performed according to a colony method of national standard GB/T2951.38-86 termite test method for electric wires and cables of the people's republic of China, wherein the testing condition is room temperature condition of 25 +/-3 ℃. The results were: the surface of the fireproof gel material of the thermal-resistance high-thermal-conductivity power cable is free of termite wormholes, and no termite-eaten wood block tooth marks are found after the gel material is cut open for inspection.
5. And (3) environment-friendly detection: through the leaching hazard component analysis of the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material detected by the limited company of the Fushan City ceramic research institute, the test result shows that Be, Se, As, Hg, Ag, Ba, Pb, Zn, Cd, Ni, Gu and Cr 6+ Are all less than 0.01mg/L, and are environment-friendly.
6. And (3) carrying capacity test:
the national grid power science research institute is entrusted to carry out the current-carrying capacity test to the low-thermal resistance high-thermal conductivity type power cable fire prevention gel material of this embodiment, specifically as follows:
1. 110Kv cable trench laying
In order to verify the application effect of the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material in the embodiment in a 110kV cable, a current-carrying capacity experiment is performed on a cable sample with the length of 20 m. The method comprises the steps of paving 50mm thick fine stone concrete at the bottom of a 20m long cable trench, building a brick wall, building a height of 300mm, covering a 50mm reinforced concrete cover plate on the trench, dividing the cable trench into two sections from the middle, wherein each section is about 10m long, one section is made of the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material, the other section is backfilled by natural soil, after 15 days of backfilling, testing is carried out after the soil naturally settles, during the testing, two groups of currents are sequentially applied, the first group is 1260A, after 72 hours of application, the current is changed to 1390A, and after the conductor temperature is stabilized, temperature measurement data is recorded for 72 hours. Three groups of temperature thermocouples are respectively arranged at the two ends and the middle position of the cable. The temperature of 1.0m deep soil at the time of the test was 14 ℃, and the test results and analyses are shown in table 3:
TABLE 3
After the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material is adopted to replace naturally backfilled soil in the cable trench, the heat dissipation environment of the cable laid in the cable trench can be improved to a certain degree, and the temperature of the conductor is reduced. According to the experimental results of the table above under two groups of currents, it can be concluded that the current-carrying capacity is 1247A before backfilling and 1351A after backfilling, which can be effectively increased by 8.3% compared with that before backfilling.
2. 110KV cable single pipe laying
The part carries out simulation experiment aiming at the current-carrying capacity of a single-phase cable sample under two conditions of direct-buried laying and pipe-penetrating laying.
The experimental total length of the cable was about 20m, including both in-line and through-pipe runs for comparison, and the conduit material was HDPE, with an outer diameter of 200mm, an inner diameter of 196mm, and a total length of 8.0 m. A group of thermocouples are respectively arranged between the backfilling section and the non-backfilling section, each group of thermocouples is 3, the distance between each group of thermocouples is 0.5m, and the average temperature of the thermocouples is used as an experimental result. The cable burying depth is 1m, the axial distance between the temperature measuring point of the grouting section and the temperature measuring point of the non-grouting section is 6m, and the soil temperature is about 14 ℃ during the experiment.
In the second stage of the experiment, constant currents shown in the following table are sequentially applied to the cable samples and kept for 72 hours, and the current values and the temperature data of each temperature measuring point when thermal stability is achieved are shown in table 4:
TABLE 4
It is seen from table 4 that, after the air in the through pipe is replaced by the fireproof gel material with low thermal resistance and high thermal conductivity for the power cable, the heat dissipation environment of the cable laid in the through pipe can be effectively improved, and the temperature of the conductor can be effectively reduced. According to the test results of table 4 under two sets of currents, it can be concluded that the current-carrying capacity is 1137A before backfilling, which can be effectively increased by 11.7% after backfilling compared with before backfilling. This result shows that the current-carrying capacity of the pipe-through laying section can be increased by backfill measures.
3. Laying 10KV current 3X 3 row of tubes
Numbering cables 1-9 in sequence (figure 3), firstly applying 330A current for 48 hours, then applying 275A current for 72 hours, recording after the temperature of the cables is stable, then filling all other penetrating pipes except No. 5 penetrating pipes with the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material, removing air in the pipes, applying 275A current, adjusting to 325A current after 24 hours, recording the temperature of a stable cable conductor and the surface temperature of the cables after 72 hours, and finding the results in Table 5
TABLE 5
Since the current-carrying capacity is the current at the conductor temperature of 90 ℃, according to the calculation method of IEC 60287 standard on the current-carrying capacity of the cable of the pipe penetrating group, the current-carrying capacity value before and after grouting is obtained by correcting and calculating on the basis of the hottest cable when the soil temperature is 15 ℃ under the experimental conditions. The pre-grouting loading capacity of the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material is 273A, and the post-grouting loading capacity I2 is 320A, which is improved by about 17.3%.
It can be seen from the above table that, under the condition that the ambient environment is not changed, the temperature of the cable in the penetrating pipe filled with the medium is significantly reduced, the reduction amplitude is 13.1 ℃ at least, the reduction proportion exceeds 13%, the number 5 penetrating pipe has no filling medium, the ambient heat dissipation environment is obviously improved, and the temperature reduction degree of the conductor is far less than that of the cables in other penetrating pipes, but is also reduced by about 4%. This fully demonstrates that the backfill medium has a significant effect on improving the heat dissipation environment of the cables in the through pipe group.
In summary, the influence of the use of the low thermal resistance and high thermal conductivity type power cable fireproof gel material of the present embodiment on the current-carrying capacity is shown in table 6 below:
TABLE 6
Second, construction experiment of low thermal resistance high heat conduction type power cable fireproof gel material
1. Cables are laid in 6 sections of cable trenches in the same direct-buried mode according to the same standard, then the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material is poured into 3 sections of cable trenches until the height is 100mm higher than the surface of the cable, then a 3cm cement protective layer is laid, and the other 3 sections of cable trenches are used as blank references. And respectively installing thermocouples on the gel material and the cable surface of the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material filling section for temperature measurement, installing thermocouples in the blank-control cable trench and the cable surface for temperature measurement, and measuring the temperature after the power cable core continuously runs for two hours, wherein the result shows that the temperature in the blank-control cable trench is 12-18 ℃ higher than the temperature on the cable surface, and the temperature difference of the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material is-2-2 ℃ when the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material is filled. Therefore, the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material has excellent heat conduction and dissipation performance, and has a remarkable improvement effect on the cable heat dissipation environment.
Example 2:
the raw materials comprise, by mass, 100 parts of bentonite, 700 parts of fine sand, 10 parts of lime powder, 7 parts of white latex, 650 parts of water, 1 part of sodium tripolyphosphate and 5 parts of water glass.
According to the components and the content, firstly, mixing bentonite, fine sand and lime powder to obtain a mixture A, then, mixing and stirring white emulsion and water uniformly to obtain a mixture B, then, adding sodium tripolyphosphate to the mixture B for dissolving, then, adding water glass, stirring and mixing to obtain a mixture C, and mixing and stirring the mixture A and the mixture C uniformly to obtain the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material.
Example 3:
the raw materials comprise, by mass, 120 parts of bentonite, 900 parts of fine sand, 12 parts of lime powder, 9 parts of white latex, 750 parts of water, 1.2 parts of sodium tripolyphosphate and 6 parts of water glass.
According to the components and the content, firstly, mixing bentonite, fine sand and lime powder to obtain a mixture A, then, mixing and stirring white emulsion and water uniformly to obtain a mixture B, then, adding sodium tripolyphosphate to the mixture B for dissolving, then, adding water glass, stirring and mixing to obtain a mixture C, and mixing and stirring the mixture A and the mixture C uniformly to obtain the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material.
Claims (2)
1. A low-thermal-resistance high-thermal-conductivity power cable fireproof gel material is characterized by comprising, by mass, 110 parts of bentonite, 800 parts of fine sand, 11 parts of lime powder, 8 parts of white latex, 700 parts of water, 1.1 parts of sodium tripolyphosphate and 5.5 parts of water glass; the fine sand is 60-100 meshes of fine sand.
2. The preparation method of the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material in claim 1 is characterized in that bentonite, fine sand and lime powder are mixed according to the components and the content in claim 1 to obtain a mixture A, then white latex and water are mixed and stirred uniformly to obtain a mixture B, sodium tripolyphosphate is added into the mixture B to be dissolved, then water glass is added to be stirred and mixed to obtain a mixture C, and the mixture A and the mixture C are mixed and stirred uniformly to obtain the low-thermal-resistance high-thermal-conductivity power cable fireproof gel material.
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