Automatically controlled electric heating PCCP steam curing equipment and curing method

Abstract

The present application relates to the field of PCCP pipe core maintenance devices and methods, and more particularly to an automatically controlled electrically heated PCCP steam maintenance device and method. The device comprises an inner tube, an outer tube, a heating tube, and a sauna stone. The heating tube is installed between the inner and outer tubes, and the sauna stones are stacked on the heating tube. A nozzle located above the sauna stone is connected to the top of the inner tube, and a water supply line connected to the nozzle is provided within the inner tube. Due to the implementation of the above-mentioned technical solution, the present application heats up the sauna stone on the heating tube, and then uses the nozzle to spray water on the sauna stone to produce steam. The sauna stone is located between the inner and outer tubes to facilitate uniform steam diffusion into the mold. Each set of molds is installed with a set of the present application structure at the bottom, achieving independent control. The device is simple to install and operate, has low energy consumption, and no water accumulates at the bottom of the maintenance pit after steam maintenance. This saves the investment in coal-fired boiler installation, testing, and operation personnel, and achieves low carbon and environmental protection during use, meeting national mandatory requirements.

Description

Technical Field

[0001] The present application relates to the field of PCCP tube core maintenance devices and methods, and in particular to an automatically controlled electrically heated PCCP steam maintenance device and maintenance method. Background Art

[0002] Currently, domestic PCCP steam curing equipment primarily utilizes coal-fired and gas-fired boilers of approximately 2 tons. These boilers use coal and combustible gases to generate steam for curing the PCCP core. National regulations are currently mandating the gradual phase-out of coal-fired boilers of 10 tons or less. Due to the nature of production, gas-fired boilers are difficult to implement due to the lack of gas sources in many production sites. Summary of the Invention

[0003] The purpose of this application is to propose an automatic controlled electric heating PCCP steam maintenance equipment and maintenance method that is low-carbon and environmentally friendly, meets national mandatory requirements, and saves boiler operators.

[0004] One of the technical solutions of the present application is implemented as follows: automatically controlled electrically heated PCCP steam curing equipment includes an inner tube, an outer tube, a heating pipe and a sauna stone; the heating pipe is installed between the inner tube and the outer tube, the sauna stone is stacked on the heating pipe, the top of the inner tube is connected to a nozzle located above the sauna stone, and a water supply pipeline connected to the nozzle is provided in the inner tube.

[0005] Furthermore, at least two layers of connectors are connected between the inner cylinder and the outer cylinder, and the heating tubes are fixedly installed between the inner cylinder and the outer cylinder through the connectors and are evenly distributed over the cross section between the inner cylinder and the outer cylinder.

[0006] Furthermore, the top of the pipeline is connected to at least 6 nozzles that are evenly distributed along the circumference of the outer cylinder and are all located on the sauna stones.

[0007] Furthermore, when the top end of the inner cylinder extends outward, a circle of anti-rising baffle is formed, and the vertical projection of the outer cylinder is located within the vertical projection range of the anti-rising baffle. The outer diameter of the anti-rising baffle is 1.2 to 1.5 times the diameter of the outer cylinder.

[0008] Furthermore, the top height of the inner tube is greater than the top height of the outer tube, the height of the outer tube above the heating tube is 100 mm to 200 mm; the height of the outer tube below the inner tube is 30 mm to 70 mm, and a line interface is provided at the bottom end of the inner tube, and the heating tube is connected to the line interface through a sealed and waterproof line; an inclined annular baffle is provided on the inner wall of the inner tube.

[0009] Furthermore, the inner cylinder is fixedly installed at the center of the mold base, and the inner mold and the outer mold are both fixed on the mold base and are sequentially sleeved on the outside of the outer cylinder.

[0010] Furthermore, it also includes an electric control cabinet, in which a controller is provided, the digital signal port of the controller is connected to a control button, the analog signal port of the controller is connected to a temperature transmitter, and the temperature transmitter is connected to a temperature sensor that can detect the internal temperature of the inner cylinder; the output end of the controller is respectively connected to a heater and a solenoid valve installed in the water supply pipeline; the controller and the solenoid valve are both connected to a 220V circuit through a switching power supply, and the heater is connected to the 220V circuit through a fuse.

[0011] The second technical solution of the present application is implemented as follows: the automatic control electric heating PCCP steam curing method includes the following steps:

[0012] Step 1: Fix the inner and outer cylinders at the center of the mold base. Pass the water supply pipeline and heating pipe circuit through the mold base and then connect them. Fix the inner and outer molds on the mold base and put them on the outside of the outer cylinder in turn.

[0013] Step 2: Place the tube core between the inner mold and the outer mold for pouring. After pouring, start to pause for 0.6 to 1.5 hours.

[0014] Step 3: Cover the top of the inner and outer molds with protective covers, and the heating tubes and nozzles start working. The temperature of the inner cylinder rises uniformly to 40-75°C, with a heating rate of no more than 22°C / hour.

[0015] Step 4: The constant temperature time is 5 to 9 hours, and the constant temperature is 35℃~75℃;

[0016] Step 5: Monitor the temperature. If the temperature is below 40°C, increase the working power of the heating tube until the temperature returns to 35°C to 75°C, and extend the constant temperature curing time to 1 to 3 hours.

[0017] Step 6: After the constant temperature is completed, the heating tube is turned off and the mold is removed after the temperature is lowered for 1 to 3 hours.

[0018] Furthermore, in the second step, the static stop time is 0.8 hours to 1.2 hours; in the third step, the temperature of the inner cylinder is uniformly heated to 45°C-70°C; in the fourth step, the constant temperature time is 6 hours to 8 hours, and the constant temperature is 45°C-70°C; in the fifth step, the temperature is restored to 45°C-70°C.

[0019] Furthermore, the static time in the second step is 1 hour; in the third step, the temperature of the inner cylinder is uniformly heated to 65°C; in the fourth step, the constant temperature time is 7 hours, and the constant temperature is 65°C; in the fifth step, the temperature is restored to 65°C; in the fifth step, the constant temperature curing time is extended to 1 hour; and in the sixth step, the cooling time is 2 hours.

[0020] Due to the implementation of the above technical solution, the present application produces steam by placing sauna stones on the heating tube to heat them up, and then using a nozzle to spray water on the sauna stones. The sauna stones are located between the inner and outer tubes to facilitate uniform diffusion of steam to the mold. A set of the present application structure is installed at the bottom of each set of molds to achieve independent control. The equipment is simple to install and use, with low energy consumption. After steam curing, there is no water accumulation at the bottom of the curing pit, which saves the investment in coal-fired boiler installation, testing and operation personnel. It achieves low carbon and environmental protection during use and meets the mandatory requirements of the country. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The specific structure of this application is given by the following drawings and examples:

[0022] Figure 1 This is a schematic structural diagram of Example 1 of the present application;

[0023] Figure 2 This is an installation diagram of Example 1 of the present application;

[0024] Figure 3 This is a schematic diagram of controller connection in Example 1 of the present application;

[0025] Figure 4 This is a schematic diagram of the power connection of Example 1 of the present application.

[0026] Legend: 1. Inner tube, 2. Outer tube, 3. Heating tube, 4. Sauna stone, 5. Water supply line, 6. Connector, 7. Anti-rise baffle, 8. Line interface, 9. Annular baffle, 10. Mold base, 11. Inner mold, 12. Outer mold, 13. Electric control cabinet, 14. Controller, 15. Control button, 16. Temperature transmitter, 17. Temperature sensor, 18. Solenoid valve, 19. Switching power supply. DETAILED DESCRIPTION

[0027] The present application is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of the present application and actual conditions.

[0028] Example 1, as Figure 1 、 2 As shown, the automatic controlled electric heating PCCP steam curing equipment includes an inner tube 1, an outer tube 2, a heating tube 3 and a sauna stone 4; the heating tube 3 is installed between the inner tube 1 and the outer tube 2, and the sauna stone 4 is stacked on the heating tube 3. The top of the inner tube 1 is connected to a nozzle located above the sauna stone 4, and a water supply pipeline 5 connected to the nozzle is provided in the inner tube 1.

[0029] The heating tube 3 is constructed by inserting a heating wire into a seamless metal tube (carbon steel, titanium, stainless steel, or copper). The interstices are then filled with magnesium oxide powder, a material with excellent thermal conductivity and insulation, and then shrinking the tube. The tube is then processed into various shapes required by the user. The heating tube 3 can be divided into two or more groups, allowing for individual heating, combined heating, and intermittent heating. This increases the lifespan of the heating tube 3 while facilitating temperature control.

[0030] The sauna stones 4 are stacked on the heating tube 3 to heat up, and then the nozzle is used to spray water on the sauna stones 4 to produce steam. The sauna stones 4 are located between the inner and outer cylinders to facilitate uniform diffusion of steam to the inner mold 11 and the outer mold 12. Each set of molds is equipped with a set of the present invention structure at the bottom to achieve independent control.

[0031] Table 1 shows the production costs for DN1800 pipes. This demonstrates that the costs associated with this application are lower than those of traditional coal-fired boilers, including equipment purchase, operating costs, and installation difficulty and expense. While ensuring quality meets national standards and minimizing environmental pollution, this application improves production efficiency and innovates concrete curing, making it suitable for widespread adoption.

[0032] like Figure 1 、 2 As shown, at least two layers of connectors 6 are connected between the inner tube 1 and the outer tube 2 , and the heating tube 3 is fixedly installed between the inner tube 1 and the outer tube 2 through the connectors 6 and is evenly distributed across the cross section between the inner tube 1 and the outer tube 2 .

[0033] In this way, the sauna stones 4 are easier to stack on the heating tubes 3, the heat transfer area is large, and the efficiency is high.

[0034] like Figure 1 、 2 As shown, the top of the pipeline is connected to at least six nozzles evenly distributed along the circumference of the outer cylinder 2 and all located on the sauna stone 4. The nozzles are designed to spray within the sauna stone 4. The spray boundaries of two adjacent nozzles are preferably tangent or slightly intersecting, and the general number can be 8 or 12.

[0035] like Figure 1 、 2 As shown, when the top end of the inner cylinder 1 extends outward, a circle of anti-rising baffle 7 is formed. The vertical projection of the outer cylinder 2 is located within the vertical projection range of the anti-rising baffle 7. The outer diameter of the anti-rising baffle 7 is 1.2 to 1.5 times the diameter of the outer cylinder 2.

[0036] This can prevent the steam generated by the sauna stone 4 from rising too fast and heating the lower part of the mold insufficiently.

[0037] like Figure 1 、 2As shown, the top height of the inner tube 1 is greater than the top height of the outer tube 2, the height of the outer tube 2 above the heating tube 3 is 100 mm to 200 mm; the height of the outer tube 2 below the inner tube 1 is 30 mm to 70 mm, and a line interface 8 is provided at the bottom end of the inner tube 1, and the heating tube 3 is connected to the line interface 8 through a sealed and waterproof line; the inner wall of the inner tube 1 is provided with an inclined annular baffle 9.

[0038] The portion of the outer tube 2 that protrudes above the heating tube 3 facilitates the stacking and securing of the sauna stones 4. The portion of the outer tube 2 that is lower than the inner tube 1 facilitates welding and securing to the mold base 10. A small drainage hole (not shown) is reserved in the center of the mold base 10. The annular baffle 9 prevents condensed water from sliding along the inner wall of the inner tube 1 and affecting the circuit interface 8. Condensed water can fall along the annular baffle 9 and eventually be discharged through the drainage hole, ensuring that there is no water accumulation at the bottom of the pit after the tube core is cured.

[0039] like Figure 1 、 2 As shown, the inner cylinder 1 is fixedly mounted on the center of the mold base plate 10 , and the inner mold 11 and the outer mold 12 are both fixed on the mold base plate 10 and sleeved on the outer side of the outer cylinder 2 in sequence.

[0040] For each mold, a steam curing system is welded onto the mold base plate 10, inside the inner mold 11. All power and water lines are connected underneath the mold base plate 10 and, depending on the situation, are centrally connected to the control room for easy maintenance. A curing cover must be used during maintenance, and, except for small drainage holes, all gaps around the mold base plate 10 are sealed to ensure a hermetic seal inside the mold. Each mold is individually controlled, resulting in low energy consumption. After steam curing, no water accumulates at the bottom of the curing pit, saving the investment in coal-fired boiler installation, testing, and operating personnel.

[0041] like Figure 3 、 4 As shown, the automatically controlled electric heating PCCP steam curing equipment also includes an electric control cabinet 13, in which a controller 14 is installed. The digital signal port of the controller 14 is connected to a control button 15, and the analog signal port of the controller 14 is connected to a temperature transmitter 16. The temperature transmitter 16 is connected to a temperature sensor 17 that can detect the internal temperature of the inner tube 1; the output end of the controller 14 is respectively connected to a heater and a solenoid valve 18 installed in the water supply pipeline 5; the controller 14 and the solenoid valve 18 are both connected to a 220V circuit via a switching power supply 19, and the heater is connected to the 220V circuit via a fuse.

[0042] Programming controller 14 is a well-known technique. Based on the analog signal output by temperature transmitter 16, controller 14 controls the start and stop of the heater and the start and stop of solenoid valve 18, thereby achieving temperature increase and constant temperature, automating maintenance work. Operators only need to turn control button 15 on and off to monitor the entire process, simplifying operation and significantly saving manpower and financial resources.

[0043] Example 2, an automatic controlled electric heating PCCP steam curing method, comprising the following steps: Step 1: fixing the inner tube 1 and the outer tube 2 at the center of the mold base 10, the water supply pipeline 5 and the heating tube 3 circuit pass through the mold base 10 and then connect, the inner mold 11 and the outer mold 12 are fixed on the mold base 10 and sequentially sleeved on the outer side of the outer tube 2; Step 2: placing the tube core between the inner mold 11 and the outer mold 12, and pouring. After the pouring is completed, the static stop time is started, and the static stop time is 0.6 hours to 1.5 hours; Step 3: the inner mold 11 and the outer mold 12 are fixed on the mold base 10 and sleeved on the outer side of the outer tube 2; Step 4: placing the tube core between the inner mold 11 and the outer mold 12, and pouring. After the pouring is completed, the static stop time is started, and the static stop time is 0.6 hours to 1.5 hours; Step 5: The top cover is covered with a protective cover, and the heating tube 3 and the nozzle start working. The temperature of the inner tube 1 is uniformly heated to 40℃-75℃, and the heating rate is no more than 32℃ / hour; Step 4: The constant temperature time is 5 hours to 9 hours, and the constant temperature is 35℃~75℃; Step 5: Monitor the temperature. If the temperature is found to be lower than 40℃, the heating tube 3 increases the working power until the temperature returns to 35℃~75℃, and the constant temperature curing time is extended to 1 hour to 3 hours; Step 6: After the constant temperature is completed, the heating tube 3 is turned off, and demoulding begins after the temperature is cooled for 1 hour to 3 hours.

[0044] Example 3, an automatic controlled electric heating PCCP steam curing method, comprising the following steps: Step 1: fixing the inner tube 1 and the outer tube 2 at the center of the mold base 10, passing the water supply pipeline 5 and the heating tube 3 circuit through the mold base 10 and then connecting them, the inner mold 11 and the outer mold 12 are both fixed on the mold base 10 and sequentially sleeved on the outer side of the outer tube 2; Step 2: placing the tube core between the inner mold 11 and the outer mold 12, and pouring. After the pouring is completed, the static stop is started, and the static stop time is 0.8 hours to 1.2 hours; Step 3: the inner mold 11 and the outer mold 12 are fixed on the mold base 10 and sleeved on the outer side of the outer tube 2; Step 4: placing the tube core between the inner mold 11 and the outer mold 12, and pouring. After the pouring is completed, the static stop time is 0.8 hours to 1.2 hours; Step 5: The top cover is covered with a protective cover, and the heating tube 3 and the nozzle start working. The temperature of the inner tube 1 is uniformly heated to 45°C-70°C, and the heating rate is no more than 32°C / hour; Step 4: The constant temperature time is 6 to 8 hours, and the constant temperature is 45°C-70°C; Step 5: Monitor the temperature. If the temperature is found to be lower than 40°C, the heating tube 3 increases the working power until the temperature returns to 45°C-70°C, and the constant temperature curing time is extended to 1 hour to 3 hours; Step 6: After the constant temperature is completed, the heating tube 3 is turned off, and demoulding begins after the temperature is cooled for 1 to 3 hours.

[0045] Example 4, an automatic controlled electric heating PCCP steam curing method, comprising the following steps: Step 1: fixing the inner tube 1 and the outer tube 2 at the center of the mold base 10, the water supply pipeline 5 and the heating tube 3 circuit pass through the mold base 10 and then connect them, the inner mold 11 and the outer mold 12 are fixed on the mold base 10 and sequentially sleeved on the outer side of the outer tube 2; Step 2: placing the tube core between the inner mold 11 and the outer mold 12, and pouring. After the pouring is completed, the static stop time is started, and the static stop time is 1 hour; Step 3: the inner The mold 11 and the outer mold 12 are covered with a curing cover, the heating tube 3 and the nozzle start working, and the temperature of the inner tube 1 is uniformly heated to 65°C, and the heating rate is not more than 32°C / hour; the fourth step: the constant temperature time is 7 hours, and the constant temperature is 65°C; the fifth step: monitor the temperature. If it is found that the temperature is lower than 40°C, the heating tube 3 increases the working power until the temperature returns to 65°C, and the constant temperature curing time is extended to 1 hour; the sixth step: after the constant temperature is completed, the heating tube 3 is turned off, and demoulding begins after cooling for 2 hours.

[0046] The curing time is the sum of the static time, heating time, constant temperature time and cooling time.

[0047] Table 2 shows the consumption required for curing a single pipe using the application, and Table 3 compares the strength of the test pipes of the application and naturally cured pipes. It can be concluded from Tables 2 and 3 that under the conditions of a temperature limit of 65°C and a curing time of 10 hours, the cured pipes meet the standard requirements in all aspects. The consumption cost for a temperature limit of 75°C is approximately 10% to 80% higher than that for a temperature limit of 65°C.

[0048] Table 4 shows the temperature test of the first group of tube cores at a temperature limit of 65°C, and Table 5 shows the strength test values of the first group of tube cores; Table 6 shows the temperature test of the second group of tube cores at a temperature limit of 65°C, and Table 5 shows the strength test values of the second group of tube cores; Tables 5 and 6 show that the PCCP tube cores after maintenance can meet the standard requirements in all aspects, solving the environmental pollution problem of coal-fired boilers, and are low-carbon and environmentally friendly.

[0049] The above technical features constitute the embodiments of the present application, which have strong adaptability and implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the needs of different situations.

[0050] Table 1:

[0051]

[0052] Table 2:

[0053]

[0054] Table 3

[0055]

[0056] Table 4

[0057]

[0058] Table 5

[0059]

[0060] Table 6

[0061]

[0062] Table 7

[0063]

Claims

1. An automatic controlled electrically heated PCCP steam curing equipment, characterized by: The utility model comprises an inner tube, an outer tube, a heating tube and a sauna stone; the heating tube is installed between the inner tube and the outer tube, the sauna stone is stacked on the heating tube, the top of the inner tube is connected to a nozzle located above the sauna stone, and a water supply pipeline connected to the nozzle is provided in the inner tube; the top of the pipeline is connected to at least 6 nozzles evenly distributed along the circumference of the outer tube and all located on the sauna stone; the top of the inner tube extends outward to form a circle of anti-rise baffles, the vertical projection of the outer tube is located within the vertical projection range of the anti-rise baffles, and the outer diameter of the anti-rise baffles is 1.2 to 1.5 times the diameter of the outer tube; the inner tube is fixedly installed at the center of the mold base plate, and the inner mold and outer mold are both fixed on the mold base plate and sequentially sleeved on the outside of the outer tube.

2. The automatic controlled electrically heated PCCP steam curing equipment according to claim 1, characterized in that: At least two layers of connecting pieces are connected between the inner cylinder and the outer cylinder. The heating pipes are fixedly installed between the inner cylinder and the outer cylinder through the connecting pieces and are evenly distributed over the cross section between the inner cylinder and the outer cylinder.

3. The automatic controlled electrically heated PCCP steam curing equipment according to claim 1, characterized in that: The top height of the inner tube is greater than the top height of the outer tube, and the height of the outer tube above the heating tube is 100 mm to 200 mm; the height of the outer tube below the inner tube is 30 mm to 70 mm, and a line interface is provided at the bottom end of the inner tube, and the heating tube is connected to the line interface through a sealed and waterproof line; the inner wall of the inner tube is provided with an inclined annular baffle.

4. The automatic controlled electrically heated PCCP steam curing equipment according to claim 1, 2 or 3, characterized in that: It also includes an electric control cabinet, which has a controller inside. The digital signal port of the controller is connected to a control button, the analog signal port of the controller is connected to a temperature transmitter, and the temperature transmitter is connected to a temperature sensor that can detect the internal temperature of the inner cylinder; the output end of the controller is respectively connected to a heater and a solenoid valve installed in the water supply pipeline; the controller and the solenoid valve are both connected to the 220V circuit through a switching power supply, and the heater is connected to the 220V circuit through a fuse.

5. A method for automatically controlling electrically heated PCCP steam curing using the automatically controlled electrically heated PCCP steam curing equipment according to any one of claims 1 to 4, characterized in that: The steps include: Step 1: Fix the inner and outer cylinders at the center of the mold base. Pass the water supply pipeline and heating pipe circuit through the mold base and then connect them. Fix the inner and outer molds on the mold base and put them on the outside of the outer cylinder in turn. Step 2: Place the tube core between the inner mold and the outer mold for pouring. After pouring, start to pause for 0.8 to 1.2 hours. Step 3: Cover the top of the inner and outer molds with protective covers, and the heating tubes and nozzles start working. The temperature of the inner cylinder rises uniformly to 45-70°C, with a heating rate of no more than 32°C / hour. Step 4: The constant temperature time is 6 to 8 hours, and the constant temperature is 45℃~70℃; Step 5: Monitor the temperature. If the temperature is below 40°C, increase the working power of the heating tube until the temperature returns to 45°C to 70°C, and extend the constant temperature curing time to 1 to 3 hours. Step 6: After the constant temperature is completed, the heating tube is turned off and the mold is removed after the temperature is lowered for 1 to 3 hours.

6. The automatic controlled electrically heated PCCP steam curing method according to claim 5, characterized in that: In the second step, the static time is 1 hour; in the third step, the temperature of the inner cylinder is uniformly heated to 65°C; in the fourth step, the constant temperature time is 7 hours, and the constant temperature is 65°C; in the fifth step, the temperature is restored to 65°C; in the fifth step, the constant temperature curing time is extended to 1 hour; and in the sixth step, the cooling time is 2 hours.

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