CN108006333B - Long-distance conveying high-temperature water pipe network system, pipeline and pipe fitting - Google Patents
Long-distance conveying high-temperature water pipe network system, pipeline and pipe fitting Download PDFInfo
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- CN108006333B CN108006333B CN201711221816.7A CN201711221816A CN108006333B CN 108006333 B CN108006333 B CN 108006333B CN 201711221816 A CN201711221816 A CN 201711221816A CN 108006333 B CN108006333 B CN 108006333B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
- F16L9/147—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and plastics with or without reinforcement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/04—Protection of pipes or objects of similar shape against external or internal damage or wear against fire or other external sources of extreme heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/06—Protection of pipes or objects of similar shape against external or internal damage or wear against wear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1009—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/084—Pipe-line systems for liquids or viscous products for hot fluids
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- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The invention provides a long-distance conveying high-temperature water pipe network system, a pipeline and a pipe fitting, and belongs to the technical field of heat supply. The pipe network system is formed by connecting a heat source and a heat user end by a pipeline, pipeline accessories, a pump and a valve, and the inner walls of parts of steel materials through which part or all of hot water passes in the high-temperature water pipe network system are compounded with a layer of anti-drag coating. The drag reducing coating has the following characteristics: the Hazeng William roughness factor is 130-140. The drag reduction coating takes fusion bonding epoxy powder coating as a substrate. The long-distance hot water conveying pipe network system reduces the pipeline conveying resistance through the composite resistance-reducing coating, and can save construction investment and conveying energy consumption in operation. The heat supply device has great significance for central heating of cities in China with wide breadth of operators and large population.
Description
Technical Field
The invention belongs to the technical field of heat supply, and particularly relates to a long-distance conveying high-temperature water pipe network system, a pipeline and a pipe fitting.
Background
With the continuous expansion of urban scale in China, the original centralized heat supply heat source cannot meet the requirement of urban heat supply, and the newly increased or expanded heat source in cities and towns with dense population faces the increasing atmospheric environment control pressure, so the existing power plant in the suburb is selected to be utilized to supply heat to the city for a long distance. The central heating market has appeared a central heating project with a distance of 40-70 km, thanks to the gradual maturity of the cogeneration waste heat recovery technology and the large temperature difference heating technology in recent years.
For long-distance heat supply projects, the operation cost accounts for a heavier proportion in the heat supply cost, and the transmission power consumption accounts for nearly 80% of the operation cost. The reason is that at present, the central heating project in China adopts high-temperature (110-. By its nature, pipeline pressure loss is a real cause of long haul transport. Although the application of cogeneration waste heat recovery and large temperature difference heat supply energy-saving technology enlarges the heat supply economic radius, part of the saved energy is consumed by the pressure loss of the pipeline. Therefore, the reduction of the pressure loss of the pipeline and the reduction of the power consumption for transportation are urgent.
Disclosure of Invention
Aiming at the problems, the invention provides a long-distance conveying high-temperature water pipeline system using a resistance-reducing coating, which can greatly reduce the conveying resistance and improve the use safety and service life of the pipeline.
The high-temperature water pipe network system for long-distance conveying is formed by connecting a heat source (a power plant) and a heat user end through a pipeline, pipeline accessories, a pump and a valve, wherein the inner walls of parts of steel materials through which part or all of hot water passes in the high-temperature water pipe network system are compounded with a layer of drag reduction coating, the Haizhongwei rough coefficient of the coating is 130-140, and the following technical requirements are met:
the general properties of the coating:
the normal temperature bending degree is 3 degrees,
the normal temperature impact resistance is more than or equal to 5J;
the Shore hardness at normal temperature is more than or equal to 70 (H);
wear resistance: using a CS-10 grinding wheel, 1kg of load and 1000 revolutions per minute; the abrasion loss is less than or equal to 30 mg;
cathode stripping: under the conditions of 23 +/-2 ℃, 48h, 3.5 percent of NaCl and-1.5V, the test result according to the SY/T0315 standard is less than or equal to 5 um;
the wet adhesive force of the coating sequentially meets the requirements of low temperature, high temperature and alternate distilled water soaking:
low-temperature soaking at 90 deg.C under normal pressure for 45 days to remove layer at 2 level or below;
soaking at 140 deg.C under 2.5MPa for 45 days to delaminate at level 2 or below;
alternating soaking, wherein the soaking is carried out at 90 ℃, normal pressure to 110 ℃, 3.2MPa, the frequency is 2-3 hours, the frequency is more than 600 times, and the delamination is less than or equal to 2 levels.
In the high-temperature water pipe network system for conveying, the thickness of the drag reduction coating is 200-700 mu m.
In the high-temperature water pipe network system for conveying, the resistance-reducing coating is preferably prepared by selecting fusion bonding epoxy powder coating as a base material.
In addition, the invention also provides a high-temperature hydrothermal pipeline for the long-distance conveying high-temperature water pipe network system, which is characterized in that the inner wall of the high-temperature hydrothermal pipeline is compounded with a layer of drag reduction coating, the Haizhongwei-Ni roughness coefficient of the coating is 130-140, and in order to realize the reliability of the coating, the coating also needs to meet the following technical requirements:
the general properties of the coating:
the normal temperature bending degree is 3 degrees,
the normal temperature impact resistance is more than or equal to 5J;
the Shore hardness at normal temperature is more than or equal to 70 (H);
wear resistance: using a CS-10 grinding wheel, 1kg of load and 1000 revolutions per minute; the abrasion loss is less than or equal to 30 mg;
cathode stripping: under the conditions of 23 +/-2 ℃, 48h, 3.5 percent of NaCl and-1.5V, the test result according to the SY/T0315 standard is less than or equal to 5 um;
the wet adhesive force of the coating sequentially meets the requirements of low temperature, high temperature and alternate distilled water soaking:
low-temperature soaking at 90 deg.C under normal pressure for 45 days to remove layer at 2 level or below;
soaking at 140 deg.C under 2.5MPa for 45 days to delaminate at level 2 or below;
alternating soaking, wherein the soaking is carried out at 90 ℃, normal pressure to 110 ℃, 3.2MPa, the frequency is 2-3 hours, the frequency is more than 600 times, and the delamination is less than or equal to 2 levels.
In the high-temperature hydrothermal pipeline provided by the invention, the thickness of the drag reduction coating is 200-.
In the high-temperature hydrothermal pipeline provided by the invention, the drag reduction coating is preferably fusion bonding epoxy powder coating.
Finally, the invention provides a high-temperature hydrothermal pipe fitting for the long-distance conveying high-temperature water pipe network system, which comprises an elbow, a tee joint and a reducer pipe, and is characterized in that the inner wall of the high-temperature hydrothermal pipe fitting is compounded with a layer of drag reduction coating, the roughness coefficient of Haizhongwei is 130-140, and in order to realize the reliability of the coating, the coating also needs to meet the following technical requirements:
the general properties of the coating:
the normal temperature bending degree is 3 degrees,
the normal temperature impact resistance is more than or equal to 5J;
the Shore hardness at normal temperature is more than or equal to 70 (H);
wear resistance: using a CS-10 grinding wheel, 1kg of load and 1000 revolutions per minute; the abrasion loss is less than or equal to 30 mg;
cathode stripping: under the conditions of 23 +/-2 ℃, 48h, 3.5 percent of NaCl and-1.5V, the test result according to the SY/T0315 standard is less than or equal to 5 um;
the wet adhesive force of the coating sequentially meets the requirements of low temperature, high temperature and alternate distilled water soaking:
low-temperature soaking at 90 deg.C under normal pressure for 45 days to remove layer at 2 level or below;
soaking at 140 deg.C under 2.5MPa for 45 days to delaminate at level 2 or below;
alternating soaking, wherein the soaking is carried out at 90 ℃, normal pressure to 110 ℃, 3.2MPa, the frequency is 2-3 hours, the frequency is more than 600 times, and the delamination is less than or equal to 2 levels.
The thickness of the anti-drag coating of the high-temperature hydrothermal pipe provided by the invention is 200 and 700 mu m.
According to the high-temperature hydrothermal pipe fitting provided by the invention, the drag reduction coating is preferably fusion bonding epoxy powder coating.
According to GB50015-2010 design specification for building plumbing 3.6.10, the head loss per unit length of the pipeline is calculated using the formula of seaonce william:
i＝105Ch-1.85dj-4.87qg1.85
where Ch is Hazeng Williams roughness factor.
It is clear from GB50015 that: the Hazen-Wei-Ni roughness coefficient of common steel pipes and cast iron pipes is 100; the roughness factor of the plastic pipe and the lining (coated) plastic pipe, once in sea, Wei cheap is 140. From the Hazeng-William formula, the head loss (kPa/m) of plastic pipes and lined (coated) plastic pipes per unit length is reduced by 40% compared with that of ordinary steel pipes and cast iron pipes. The conveying resistance is greatly reduced by transforming the surface of the inner wall of the common steel pipe into the surface of the plastic, and the conveying power consumption can be greatly reduced. The fusion combined epoxy powder coating belongs to a thermosetting plastic coating, and is compounded on the inner wall of a common steel pipe for conveying high-temperature water, so that the conveying resistance can be greatly reduced, and meanwhile, the excellent protective performance of the coating can also improve the use safety and the service life of the pipeline.
According to the long-distance conveying high-temperature water pipe network using the anti-drag coating, the anti-drag coating is compounded on the inner walls of all steel parts in the high-temperature water pipe network, so that the conveying resistance is greatly reduced, and the conveying power consumption can be greatly reduced. The fusion bonding epoxy powder coating used in the invention belongs to a thermosetting plastic coating, and the coating is compounded on the inner wall of a common steel pipe for conveying high-temperature water, so that the conveying resistance can be greatly reduced, and meanwhile, the excellent corrosion resistance of the coating can also improve the use safety and the service life of a pipeline.
The long-distance conveying hot water pipe network reduces the pressure drop of the pipeline by reducing the resistance of the composite anti-lease coating, and can save the construction investment and the later conveying energy consumption. The heat supply device has great significance for central heating of cities in China with wide breadth of operators and large population.
Drawings
FIG. 1 is a schematic view of a long-distance conveying high-temperature water pipe network.
Wherein: 1 power plant, 2 water pump, 3 elbows, 4 fixed pipe fittings, 5 compensators, 6 isolating valves, 7 tee joints, 8 reducer pipes, 9 pipelines, 10 heat exchangers and 11 heat users.
FIG. 2 is a diagram of: phi 1420 single-loop scheme;
FIG. 3 is a diagram of: a phi 1020 dual-loop scheme;
FIG. 4 is a diagram of: the second alternative scheme.
Detailed Description
Example 1
The project of a long hot water pipeline for central heating from a suburb to a city in a certain city is taken as an example:
distance: routing 40km, and total length 40 × 4 ═ 160km (two supply and two return);
parameters are as follows: the water supply temperature is 130 ℃, the water return temperature is 55 ℃, the pressure is 2.5MPa, the flow is 30000t/h, the flow rate is 2.91m/s, and the design life is 30 years;
pipe diameter: water supply phi 1420 multiplied by 20mm multiplied by 2 and water return phi 1420 multiplied by 18mm multiplied by 2;
pipe material: l290 spiral welded steel pipe.
The pipeline network is shown in FIG. 1; the system comprises a power plant 1, a water pump 2, an elbow 3, a fixed pipe fitting 4, a compensator 5, an isolating valve 6, a tee joint 7, a reducer pipe 8, a pipeline 9, a heat exchanger 10 and a heat consumer 11; the heat supply end and the heat user end are connected by a pump, a valve, a pipe fitting and a pipeline. The maximum fall of the starting end and the starting end is about 300m, 7 pressurizing stations are planned to be built in the whole process, and the total investment of only the pressurizing stations is about 7 hundred million yuan.
The aim of drag reduction is as follows: 1. the number of pressurizing stations is reduced, so that the construction investment is saved;
2. the transmission and distribution energy consumption is reduced, and the operation cost is reduced.
According to the design:
the drag reduction coating is fusion bonding epoxy powder coating which is composed of bisphenol A epoxy resin, amine curing agent and the like. The epoxy powder coating comprises the following raw materials in parts by weight: 20 parts of organic silicon modified epoxy resin, 10 parts of methyl phenyl silicone resin, 10 parts of polyethylene, 5 parts of vinyl trialkyl silane, 2 parts of propylene glycol methyl ether acetate, 2 parts of methyl methacrylate, 1 part of alkyd resin, 2 parts of resorcinol, 2 parts of polyvinyl ether, 1 part of activated carbon, 15 parts of talcum powder, 5 parts of aluminum nitride powder, 4 parts of silica fume powder, 10 parts of mica powder, 10 parts of dicyandiamide and 1 part of ferric oxide. The heat-resistant epoxy powder coating has excellent adhesive force, hardness, chemical resistance and physical and mechanical properties, and also has excellent heat-resistant effect and wear-resistant property. The coating is sprayed on the inner wall of the pipeline of the heat supply long-distance pipeline, and the spraying thickness is 400 mu m.
The coating was tested to meet the following properties.
The general properties of the coating:
the normal temperature bending degree is 3 degrees,
the normal temperature impact resistance is more than or equal to 5J;
the Shore hardness at normal temperature is more than or equal to 70 (H);
wear resistance: using a CS-10 grinding wheel, 1kg of load and 1000 revolutions per minute; the abrasion loss is less than or equal to 30 mg;
cathode stripping: under the conditions of 23 +/-2 ℃, 48h, 3.5 percent of NaCl and-1.5V, the test result according to the SY/T0315 standard is less than or equal to 5 um;
the wet adhesive force of the coating sequentially meets the requirements of low temperature, high temperature and alternate distilled water soaking:
low-temperature soaking at 90 deg.C under normal pressure for 45 days to remove layer at 2 level or below;
soaking at 140 deg.C under 2.5MPa for 45 days to delaminate at level 2 or below;
alternating soaking, wherein the soaking is carried out at 90 ℃, normal pressure to 110 ℃, 3.2MPa, the frequency is 2-3 hours, the frequency is more than 600 times, and the delamination is less than or equal to 2 levels.
The Hazeng Williams roughness factor Ch is 140.
After the drag reduction coating is compounded on the inner wall of the steel pipe by adopting the method, the pressure drop of the pipeline is reduced by about 40 percent, namely the pressure drop of the system is reduced by 141 multiplied by 2 m. The results are more than without the resistance reducing layer:
1. two pressurizing stations are reduced, and the construction investment is saved by about 1.8 million yuan. After deducting about 0.9 million yuan of drag reduction investment, the total construction cost is saved by 0.9 million yuan.
2. The power consumption of each heating season is saved by 4398 ten thousand DEG, the power cost (peak-valley average price) is reduced by 2418 ten thousand yuan, and the power cost can be saved by 7.254 million yuan in 30 years.
Therefore, the long-distance hot water conveying pipe network reduces the pressure drop of the pipeline through the resistance reduction of the plastic coating, and can greatly save the construction investment and the later conveying energy consumption. The heat supply device has great significance for central heating of cities in China with wide breadth of operators and large population.
Example 2
In the engineering for transforming the primary high-temperature water pipe network for central heating of a certain city, the cross section size of an original trench is 4.9m multiplied by 2.2m, the total length is about 40 kilometers, and the working parameters are that the water supply temperature is 125 ℃, the water return temperature is 65 ℃, the pressure is 2.5MPa, the flow rate is 15000t/h, the flow speed is 2.91m/s, and the design life is 20 years. The original transformation scheme is that a single-loop two hot water pipelines with the diameter phi 1420mm (the heat preservation outer diameter phi 1650mm) are installed to form a single-loop primary high-temperature water pipe network as shown in figure 2. In order to improve the operation reliability, the original single-loop scheme is changed into a double-loop scheme, that is, a two-supply two-loop heat supply mode consisting of 4 pieces of phi 1020 multiplied by 12mm (heat preservation external diameter phi 1164mm) is shown in FIG. 3,
it can be seen that 4 hot water pipes of phi 1020 cannot be arranged in the original trench, and as the implementation scheme not only increases the expansion cost of the trench by about 2 billion yuan, but also has no expansion space in the town part of the route of 40 km. The new scheme adopts a two-supply (phi 1020 multiplied by 2) and one-return (phi 1220 multiplied by 1) heat supply mode, as shown in figure 4. Generally, according to the principle of matching the flow of supply and return pipes, the diameter of the return pipe should be phi 1420, and as the residual space of the original trench can only be provided with a pipeline phi 1220. The scheme for solving the bottleneck problem of the system is that a resistance reducing layer is applied to the inner wall of a phi 1220 water return pipe, and the resistance generated when hot water with the flow rate of 15000t/h passes through the resistance reducing layer is smaller than or equal to the resistance of two phi 1020 water supply pipes by utilizing the resistance reducing characteristic of the resistance reducing layer. Resistance calculation check hydraulic calculation Hazen-Weiliam formula (Hazen-Williams) according to GB50015-2010 design Specification for Water supply and drainage for construction
i＝105Ch -1.85dj -4.87qg 1.85
Wherein: i is the head loss per unit length, kPa/m; q. q.sgIs the flow rate, m3/s；djIs the inner diameter of the pipe, m;
Chthe coefficient of friction is H-W, the steel pipe is 100, the copper pipe is 130, the plastic pipe is 140, and the lining cement cast iron pipe is 130.
1. Water supply pipe, phi 1020 x 12mm x 2, single pipe flow (t/h) 15000/2-2.085 m3S, when the inner wall has no resistance reducing layer Ch100, single water supply pipe resistance iG(kPa/m)：
iG＝105×100-1.85×0.996-4.87×2.0851.85
iG＝0.0832kPa/m
2. A water return pipe with the diameter of 1220 multiplied by 14mm multiplied by 1, and the total flow rate of 15000t/h is 4.17m3S, when the inner wall has a resistance reducing layer ChTaking C when conservative calculation is carried out, wherein C is taken when the conservative calculation is carried outh130, return resistance iH(kPa/m)：
iH＝105×130-1.85×1.192-4.87×4.171.85
iH＝0.077kPa/m
3. And (4) conclusion: i.e. iH≤iGThrough the drag reduction of the inner wall, a single pipeline with the diameter of 1220 multiplied by 14mm not only meets the use requirement, but also saves the reconstruction cost of 40km trench by about 2 hundred million yuan, and greatly accelerates the project progress.
The design life is 20 years. According to the design, a layer of drag reduction coating is compounded on the inner walls of all the pipelines in the pipe network.
The drag reduction coating is a fusion bonding epoxy powder coating, and comprises 500 parts by weight of saturated polyester resin with an acid value of 30-38 mgKOH/g, 40 parts by weight of TGIC curing agent with an epoxy equivalent of 105-115 g/eq, 110 parts by weight of barium sulfate, 100 parts by weight of auxiliary agent and 250 parts by weight of pigment, wherein the auxiliary agent is a mixture of a leveling agent, a degassing agent and wax powder; the mass ratio of the flatting agent, the wetting agent, the degasifying agent and the wax powder is 1:1:0.5: 0.5. The wetting agent is an acrylate copolymer wetting agent. The wax powder is polytetrafluoroethylene wax powder. The degasifier is benzoin. The leveling agent is an acrylate leveling agent.
The coating is sprayed on the inner wall of the pipeline of the heat supply long-distance pipeline, and the spraying thickness is 500 mu m.
We examined the coating which satisfies the following properties.
The general properties of the coating:
the normal temperature bending degree is 3 degrees,
the normal temperature impact resistance is more than or equal to 5J;
the Shore hardness at normal temperature is more than or equal to 70 (H);
wear resistance: using a CS-10 grinding wheel, 1kg of load and 1000 revolutions per minute; the abrasion loss is less than or equal to 30 mg;
cathode stripping: under the conditions of 23 +/-2 ℃, 48h, 3.5 percent of NaCl and-1.5V, the test result according to the SY/T0315 standard is less than or equal to 5 um;
the wet adhesive force of the coating sequentially meets the requirements of low temperature, high temperature and alternate distilled water soaking:
low-temperature soaking at 90 deg.C under normal pressure for 45 days to remove layer at 2 level or below;
soaking at 140 deg.C under 2.5MPa for 45 days to delaminate at level 2 or below;
alternating soaking, wherein the soaking is carried out at 90 ℃, normal pressure to 110 ℃, 3.2MPa, the frequency is 2-3 hours, the frequency is more than 600 times, and the delamination is less than or equal to 2 levels.
Example 3
The operation parameters of a central heating hot water pipe network in a certain city are as follows: the water supply temperature is 130 ℃, the water return temperature is 65 ℃, the pressure is 2.5MPa, the flow is 11000t/h, the flow rate is 2.96m/s, the design life is 30 years, a single loop is adopted for transporting and distributing hot water, the diameter of the water supply and return pipe is phi 1220 multiplied by 16mm, and the direct-buried laying is carried out. About 3km of pipe sections passing through an urban area need to enter an urban public pipe gallery for overhead laying according to requirements, and only two heat preservation pipes with the diameter of 1020 multiplied by 12mm can be arranged in the pipe gallery, so that the problem of diameter reduction and flow closure is solved by reducing the resistance of the pipe sections with the diameter of 1020 multiplied by 12mm through the inner wall drag reduction coating, and the checking and calculating process of the scheme is as follows:
resistance checking and checking according to the hydraulic calculation Hazen-Williams formula in GB50015-2010 design Specification for Water supply and drainage for buildings (Hazen-Williams)
i＝105Ch -1.85dj -4.87qg 1.85
Wherein: i is the head loss per unit length, kPa/m; q. q.sgIs the flow rate, m3/s；djIs the inner diameter of the pipe, m;
Chthe coefficient of friction is H-W, the steel pipe is 100, the copper pipe is 130, the plastic pipe is 140, and the lining cement cast iron pipe is 130.
1. Calculation of resistance after drag reduction of phi 1020 x 12mm
Working steel pipe phi 1020 multiplied by 12mm, flow rate 11800t/h 3.28m3Coefficient of friction of/s, H-W Ch140, resistance i10(kPa/m)：
i10＝105×140-1.85×0.996-4.87×3.281.85
i10＝0.1kPa/m
2. Calculation of resistance at phi 1220X 16mm non-drag reduction
Working steel pipe phi 1220X 16mm, flow rate 11800t/h 3.28m3S, when the inner wall has no resistance reducing layer Ch100, resistance i12(kPa/m)：
i12＝105×100-1.85×1.188-4.87×3.281.85
i12＝0.082kPa/m
3. And (4) conclusion: the phi 1020 multiplied by 12mm pipeline is subjected to drag reduction through the inner wall, the single long head loss of the pipeline is 0.018kPa/m larger than that of the phi 1220 multiplied by 16mm pipeline, but still in the range of lift allowance of the circulating water pump, so the scheme is feasible.
According to the design, a layer of drag reduction coating is compounded on the inner walls of the phi 1020 multiplied by 12mm water supply and return pipelines and the pipe fittings laid in the pipe gallery.
The drag reduction coating is a fusion bonding epoxy powder coating, and the high heat-resistant epoxy resin-based powder coating comprises the following components in percentage by mass: 20% of high molecular weight epoxy resin with the molecular weight of 4000-6000, 2% of polyarylene sulfide resin, 2% of dibutyltin dilaurate, 16% of titanium dioxide treated by a silane coupling agent, 20% of pigment and 50% of low molecular weight epoxy resin with the molecular weight of 1200-3000.
The coating is sprayed on the inner wall of the pipeline of the heat supply long-distance pipeline, and the spraying thickness is 400 mu m.
We examined the coating which satisfies the following properties.
The general properties of the coating:
the normal temperature bending degree is 3 degrees,
the normal temperature impact resistance is more than or equal to 5J;
the Shore hardness at normal temperature is more than or equal to 70 (H);
wear resistance: using a CS-10 grinding wheel, 1kg of load and 1000 revolutions per minute; the abrasion loss is less than or equal to 30 mg;
cathode stripping: under the conditions of 23 +/-2 ℃, 48h, 3.5 percent of NaCl and-1.5V, the test result according to the SY/T0315 standard is less than or equal to 5 um;
the wet adhesive force of the coating sequentially meets the requirements of low temperature, high temperature and alternate distilled water soaking:
low-temperature soaking at 90 deg.C under normal pressure for 45 days to remove layer at 2 level or below;
soaking at 140 deg.C under 2.5MPa for 45 days to delaminate at level 2 or below;
alternating soaking, wherein the soaking is carried out at 90 ℃, normal pressure to 110 ℃, 3.2MPa, the frequency is 2-3 hours, the frequency is more than 600 times, and the delamination is less than or equal to 2 levels.
Taking the project of central heating long-distance pipeline as an example, the method is adopted to compound a layer of resistance-reducing coating on the inner wall of the steel pipe to be thick, so that the pressure drop of the pipeline is reduced by 40 percent, namely the pressure drop of the system is reduced by 141 multiplied by 2 m. Each heating season is 4398 ten thousand DEG, and the converted electricity charge (peak-valley average price) is 2418 ten thousand yuan. Two pressurizing stations can be directly reduced, and the construction investment is saved by about 1.6 million yuan. The total electricity saving cost is 7.254 billion yuan in 20 years.
Claims (3)
1. A long-distance conveying high-temperature water pipe network system is formed by connecting a heat source and a heat user end through a pipeline, pipeline accessories, a pump and a valve, wherein the inner walls of steel parts through which part or all of hot water passes are compounded with a layer of drag reduction coating, and the roughness coefficient of Haizhong Weilian is 130-140, and the drag reduction coating meets the following technical requirements:
the general properties of the coating:
normal temperature bending degree is 3 degrees;
the normal temperature impact resistance is more than or equal to 5J;
the Shore hardness at normal temperature is more than or equal to 70 (H);
wear resistance: using a CS-10 grinding wheel, 1kg of load and 1000 rpm of rotating speed; the abrasion loss is less than or equal to 30 mg;
cathode stripping: under the conditions of 23 +/-2 ℃, 48h, 3.5 percent of NaCl and-1.5V, the test result according to the SY/T0315 standard is less than or equal to 5 mu m;
the wet adhesion of the coating meets the requirements of low temperature, high temperature and alternate distilled water soaking in sequence:
low-temperature soaking at 90 deg.C under normal pressure for 45 days to remove layer at 2 level or below;
soaking at 140 deg.C under 2.5MPa for 45 days to delaminate at level 2 or below;
alternately soaking, carrying out delamination at 90 ℃, normal pressure to 110 ℃, 3.2MPa, frequency for 2-3 hours, frequency for 600 times and level 2 or less;
the thickness of the anti-drag coating is 400-700 mu m;
the drag reduction coating is a fusion bonding epoxy powder coating, and the coating comprises 500 parts by weight of saturated polyester resin with an acid value of 30-38 mgKOH/g, 40 parts by weight of TGIC curing agent with an epoxy equivalent of 105-115 g/eq, 110 parts by weight of barium sulfate, 100 parts by weight of auxiliary agent and 250 parts by weight of pigment, wherein the auxiliary agent is a mixture of a leveling agent, a wetting agent, a degasifier and wax powder; the mass ratio of the leveling agent to the wetting agent to the degasifier to the wax powder is 1:1:0.5:0.5, the wetting agent is an acrylate copolymer wetting agent, the wax powder is polytetrafluoroethylene wax powder, the degasifier is benzoin, and the leveling agent is an acrylate leveling agent.
2. A high-temperature hydrothermal pipeline for a long-distance conveying high-temperature water pipe network system as claimed in claim 1, wherein the inner wall of the high-temperature hydrothermal pipeline is compounded with a drag reduction coating, and the roughness coefficient of Haiyermui is 130-140, and the drag reduction coating meets the following technical requirements:
the general properties of the coating:
normal temperature bending degree is 3 degrees;
the normal temperature impact resistance is more than or equal to 5J;
the Shore hardness at normal temperature is more than or equal to 70 (H);
wear resistance: using a CS-10 grinding wheel, 1kg of load and 1000 revolutions per minute; the abrasion loss is less than or equal to 30 mg;
cathode stripping: under the conditions of 23 +/-2 ℃, 48h, 3.5 percent of NaCl and-1.5V, the test result according to the SY/T0315 standard is less than or equal to 5 mu m;
the wet adhesion of the coating meets the requirements of low temperature, high temperature and alternate distilled water soaking in sequence:
low-temperature soaking at 90 deg.C under normal pressure for 45 days to remove layer at 2 level or below;
soaking at 140 deg.C under 2.5MPa for 45 days to delaminate at level 2 or below;
alternately soaking, namely alternately soaking at 90 ℃, normal pressure to 110 ℃, 3.2MPa, frequency for 2-3 hours, frequency more than 600 times and delamination less than or equal to 2 grades;
the thickness of the anti-drag coating is 400-700 mu m;
the drag reduction coating is a fusion bonding epoxy powder coating, and the coating comprises 500 parts by weight of saturated polyester resin with an acid value of 30-38 mgKOH/g, 40 parts by weight of TGIC curing agent with an epoxy equivalent of 105-115 g/eq, 110 parts by weight of barium sulfate, 100 parts by weight of auxiliary agent and 250 parts by weight of pigment, wherein the auxiliary agent is a mixture of a leveling agent, a wetting agent, a degasifier and wax powder; the mass ratio of the leveling agent to the wetting agent to the degasifier to the wax powder is 1:1:0.5:0.5, the wetting agent is an acrylate copolymer wetting agent, the wax powder is polytetrafluoroethylene wax powder, the degasifier is benzoin, and the leveling agent is an acrylate leveling agent.
3. A high-temperature hydrothermal pipe fitting for a long-distance conveying high-temperature water pipe network system as claimed in claim 1, which comprises an elbow, a tee joint and a reducer pipe, wherein the inner wall of the high-temperature hydrothermal pipe fitting is compounded with a drag reduction coating, and the roughness coefficient of Haizhong Weiliai is 130-140, and the drag reduction coating meets the following technical requirements:
the general properties of the coating:
normal temperature bending degree is 3 degrees;
the normal temperature impact resistance is more than or equal to 5J;
the Shore hardness at normal temperature is more than or equal to 70 (H);
wear resistance: using a CS-10 grinding wheel, 1kg of load and 1000 revolutions per minute; the abrasion loss is less than or equal to 30 mg;
cathode stripping: under the conditions of 23 +/-2 ℃, 48h, 3.5 percent of NaCl and-1.5V, the test result according to the SY/T0315 standard is less than or equal to 5 um;
the wet adhesive force of the coating sequentially meets the requirements of low temperature, high temperature and alternate distilled water soaking:
low-temperature soaking at 90 deg.C under normal pressure for 45 days to remove layer at 2 level or below;
soaking at 140 deg.C under 2.5MPa for 45 days to delaminate at level 2 or below;
alternately soaking, namely alternately soaking at 90 ℃, normal pressure to 110 ℃, 3.2MPa, frequency for 2-3 hours, frequency more than 600 times and delamination less than or equal to 2 grades;
the thickness of the anti-drag coating is 400-700 mu m;
the drag reduction coating is a fusion bonding epoxy powder coating, and the coating comprises 500 parts by weight of saturated polyester resin with an acid value of 30-38 mgKOH/g, 40 parts by weight of TGIC curing agent with an epoxy equivalent of 105-115 g/eq, 110 parts by weight of barium sulfate, 100 parts by weight of auxiliary agent and 250 parts by weight of pigment, wherein the auxiliary agent is a mixture of a leveling agent, a wetting agent, a degasifier and wax powder; the mass ratio of the leveling agent to the wetting agent to the degasifier to the wax powder is 1:1:0.5:0.5, the wetting agent is an acrylate copolymer wetting agent, the wax powder is polytetrafluoroethylene wax powder, the degasifier is benzoin, and the leveling agent is an acrylate leveling agent.
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