High-concentration calcium solution pipeline tracing device

Abstract

The present invention discloses a high-concentration calcium liquid pipeline tracing heating device, which relates to the field of liquid pipeline tracing heating devices. This device includes a steam pipe, a tracing heat pipe, a drain pipe, a tracing heat insulation kettle, a liquid pump and a granulator nozzle; the steam pipe is connected to two steam branch pipes, the first steam branch pipe is connected to the upper end of the outer layer pipe of the tracing heat pipe, and the lower end of the outer layer pipe of the tracing heat pipe is connected to the drain pipe; the second steam branch pipe is connected to the top of the interlayer of the tracing heat insulation kettle, and the bottom of the interlayer of the tracing heat insulation kettle is connected to the drain pipe, and a steam trap is arranged on the drain pipe; the inlet of the tracing heat insulation kettle is connected to the liquid inlet pipe, the outlet of the tracing heat insulation kettle is connected to the liquid pump, the liquid pump is connected to the lower end of the inner layer pipe of the tracing heat pipe, and the upper end of the inner layer pipe of the tracing heat pipe is connected to the granulator nozzle. The device provided by the present invention avoids product quality problems caused by internal leakage of heat-conducting oil due to pipeline corrosion, and avoids safety and environmental protection accidents caused by external leakage of heat-conducting oil; it reduces the use and maintenance costs, has a short process flow and low energy consumption.

Description

Technical Field

[0001] The present invention relates to the field of liquid pipeline tracing devices, and particularly to a high-concentration calcium liquid pipeline tracing device. Background Art

[0002] At present, granular calcium chloride products are produced in a high tower by using a calcium liquid pump to transport a solution containing 69-70% calcium chloride at 165-175°C to a granulation tower 45 meters high for spraying granulation. Due to the characteristics of the high-concentration calcium chloride solution, as the temperature decreases, the liquid viscosity increases, resulting in a decrease in fluidity and a risk of pipeline blockage.

[0003] The calcium liquid pipeline is a double-layer pipeline. An electric heater is used to heat the heat-conducting oil to 170-190°C for circulation on the outer layer of the pipeline, and heat is transferred to the high-concentration calcium liquid by heat conduction to maintain the temperature of the calcium liquid in the pipeline and ensure the fluidity of the calcium liquid. However, using heat-conducting oil for tracing the high-concentration calcium liquid pipeline has problems such as high power consumption and frequent maintenance. Moreover, if the heat-conducting oil leaks, it will not only affect the product quality but also cause safety and environmental protection accidents, and it is not conducive to maintenance. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a high-concentration calcium liquid pipeline tracing device, which is simple to operate, has high efficiency, low energy consumption, and is convenient for maintenance.

[0005] To achieve this technical purpose, the present invention adopts the following scheme: A high-concentration calcium liquid pipeline tracing device includes a steam pipe, a tracing pipe, a drain pipe, a tracing and heat preservation kettle, a liquid inlet pipe, a liquid pump, and a granulator spray head. The tracing pipe is a double-layer pipe structure with an outer layer and an inner layer. A sandwich is provided on the outer wall of the tracing and heat preservation kettle. The outlet of the steam pipe is respectively provided with a first steam branch pipe and a second steam branch pipe. The first steam branch pipe is connected to the upper end of the outer layer pipe of the tracing pipe, the lower end of the outer layer pipe of the tracing pipe is connected to the drain pipe, the second steam branch pipe is connected to the top of the sandwich of the tracing and heat preservation kettle, the bottom of the sandwich of the tracing and heat preservation kettle is connected to the drain pipe, and a steam trap is provided on the drain pipe. The inlet of the kettle body of the tracing and heat preservation kettle is connected to the liquid inlet pipe, the outlet of the kettle body of the tracing and heat preservation kettle is connected to the inlet of the liquid pump, the outlet of the liquid pump is connected to the lower end of the inner layer pipe of the tracing pipe, and the upper end of the inner layer pipe of the tracing pipe is connected to the granulator spray head.

[0006] Compared with the prior art, the beneficial effects of the present invention are as follows: The device provided by the present invention avoids product quality problems caused by internal leakage of heat-conducting oil due to pipeline corrosion, and at the same time avoids safety and environmental protection accidents caused by external leakage of heat-conducting oil; it reduces the use and maintenance costs of the equipment, has a short process flow, is simple to operate, and has low energy consumption.

[0007] The preferred scheme of the present invention is:

[0008] The pressure of the supersaturated steam in the steam pipe is 1.5 MPa.

[0009] Pressure reducing valves, pressure gauges and thermometers are respectively arranged on the first steam branch pipe and the second steam branch pipe to ensure stable steam pressure.

[0010] The pressure after pressure reduction of the first steam branch pipe and the second steam branch pipe is 0.85 - 0.95 MPa to ensure smooth pipeline.

[0011] A thermometer is arranged on the drain pipe along the liquid flow direction to detect temperature and drain water while blocking steam.

[0012] The steam temperature in the steam pipe is 180°C - 190°C, and the medium temperature of the drain pipe is 170°C - 180°C respectively to ensure smooth pipeline. Brief Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of the high-concentration calcium solution pipeline heat tracing device provided by the embodiment of the present invention;

[0014] The marks in the figure are: 1. Steam pipe; 2. First steam branch pipe; 3. First pressure reducing valve; 31. Second pressure reducing valve; 4. First pressure gauge; 41. Second pressure gauge; 5. Thermometer; 6. Heat tracing pipe; 7. First steam trap; 8. First drain pipe; 9. Heat tracing and heat preservation kettle; 10. Liquid inlet pipe; 11. Liquid pump; 12. Granulator nozzle; 13. Second steam branch pipe; 14. Second drain pipe; 15. Second steam trap. Detailed Embodiment

[0015] To fully understand the purpose, features and effects of the present invention, the present invention will be described in detail through the following specific embodiments, but the present invention is not limited thereto.

[0016] Please refer to Figure 1, a high-concentration calcium liquid pipeline tracing heating device provided by the present invention is composed of a steam pipe 1, a tracing pipe 6, a drain pipe, a tracing and heat preservation kettle 9, a liquid inlet pipe 10, a liquid pump 11, a granulator nozzle 12, etc. The tracing pipe 6 is a double-layer pipe inside and outside. The tracing and heat preservation kettle 9 is a kettle body structure with an outer jacket. The drain pipe is divided into a first drain pipe 8 and a second drain pipe 14, and the pressure of the second drain pipe 14 is lower than that of the first drain pipe 8. The outlet of the steam pipe 1 is respectively connected with a first steam branch pipe 2 and a second steam branch pipe 13. The first steam branch pipe 2 is connected to the upper end of the outer layer pipe of the tracing pipe 6, and the lower end of the outer layer pipe of the tracing pipe 6 is connected to the first drain pipe 8. The second steam branch pipe 13 is connected to the top of the interlayer of the tracing and heat preservation kettle 9, and the bottom of the interlayer of the tracing and heat preservation kettle 9 is connected to the second drain pipe 14. A first pressure reducing valve 3, a first pressure gauge 4 and a thermometer 5 are respectively arranged on the first steam branch pipe 2 according to the gas flow direction. A second pressure reducing valve 31, a second pressure gauge 41 and a thermometer 5 are respectively arranged on the second steam branch pipe 13 according to the gas flow direction. Thermometers 5 and steam traps are respectively arranged on the first drain pipe 8 and the second drain pipe 14 according to the liquid flow direction. The steam trap has the function of draining water and blocking steam. A first steam trap 7 is installed on the first drain pipe 8, and a second steam trap 15 is installed on the second drain pipe 14. The pressure in the second drain pipe 14 is lower than the pressure in the first drain pipe 8.

[0017] The kettle body inlet of the tracing and heat preservation kettle 9 is connected to the high-concentration calcium liquid inlet pipe 10, the kettle body outlet of the tracing and heat preservation kettle 9 is connected to the inlet of the liquid pump 11, the outlet of the liquid pump 11 is connected to the lower end of the inner layer pipe of the tracing pipe 6, and the upper end of the inner layer pipe of the tracing pipe 6 is connected to the granulator nozzle 12.

[0018] The working process is as follows: The supersaturated steam at 1.5 MPa in the steam pipe 1 is divided into two parts and enters the device. One part passes through the first steam branch pipe 2, and after passing through the valve, the first pressure gauge 4 transmits the pressure value to the first pressure reducing valve 3 for automatic pressure reduction. The automatic pressure range is set at 0.85 - 0.95 MPa. When the pressure drops to 0.85 - 0.95 MPa, the reduced-pressure steam enters the outer layer pipe of the tracing pipe 6 from the upper end of the tracing pipe 6 to heat and keep warm the concentrated calcium solution. The steam enters the first drain pipe 8 from the lower end of the outer layer pipe of the tracing pipe 6, and the liquid water is discharged through the first steam trap 7. The temperature in the first drain pipe 8 is between 170°C and 180°C. The other part of the steam passes through the second steam branch pipe 13, and after passing through the valve, the second pressure gauge 41 transmits the pressure value to the second pressure reducing valve 31 for automatic pressure reduction. The automatic pressure range is set at 0.85 - 0.95 MPa. When the pressure drops to 0.85 - 0.95 MPa, the reduced-pressure steam enters from the top of the outer sandwich layer of the heat tracing and insulation kettle 9 to heat the concentrated calcium solution in the heat tracing and insulation kettle 9. The condensate reaches the second steam trap 15 from the bottom of the outer sandwich layer of the heat tracing and insulation kettle 9. The steam trap blocks the steam and discharges the liquid. The concentrated calcium solution enters the heat tracing and insulation kettle 9 through the liquid inlet pipe 10, exchanges heat with the outer sandwich layer of steam, and is then transported to the inner layer pipe of the tracing pipe 6 by the liquid pump 11. The outer layer pipe of the tracing pipe 6 heats the concentrated calcium solution, and finally the concentrated calcium solution enters the granulator nozzle 12 for granulation production.

[0019] When starting up, first open the first steam trap 7 and the second steam trap 15 respectively, manually adjust the first pressure reducing valve 3 and the second pressure reducing valve 31 to the minimum pressure respectively, and slowly adjust the pressure reducing valve to make the heat preservation steam pressure of the calcium solution pipeline stable at 0.85 - 0.95 MPa, the steam temperature in the steam pipe at 180°C - 190°C, and the medium temperatures in the first drain pipe 8 and the second drain pipe 14 at 170 - 180°C respectively to ensure smooth flow. After feeding, strictly control the temperature of the heat tracing steam and observe the granulation state of the granulator. If the temperature of the heat tracing steam is too high, the water in the calcium solution in the pipeline will boil and evaporate, and the spraying liquid will be accompanied by steam, resulting in more product broken particles and fines; if the temperature of the heat preservation steam is too low, the fluidity of the calcium solution is poor, and the nozzle is prone to crystallization, blocking the pipeline and the nozzle.

[0020] The device provided by the present invention avoids product quality problems caused by internal leakage of the heat transfer oil due to pipeline corrosion, and at the same time avoids safety and environmental protection accidents caused by external leakage of the heat transfer oil; reduces the use and maintenance costs of the equipment, has a short process flow, simple device operation, and low energy consumption.

[0021] Finally, it should be noted that: The above-listed are only the preferred embodiments of the present invention. Of course, those skilled in the art can make changes and variations to the present invention. If these modifications and variations fall within the scope of the claims of the present invention and its equivalent technologies, they should all be considered within the protection scope of the present invention.

Claims

1. A high-concentration calcium liquid pipeline tracing heating device, comprising a steam pipe, a tracing heat pipe, a drain pipe, a tracing heat insulation kettle, a liquid inlet pipe, a liquid pump and a granulator nozzle. The tracing heat pipe has a double-layer pipe structure inside and outside, and a sandwich layer is arranged on the outer wall of the tracing heat insulation kettle; characterized in that, The outlets of the steam pipes are respectively provided with a first steam branch pipe and a second steam branch pipe. The first steam branch pipe is connected to the upper end of the outer layer pipe of the tracing heat pipe. The lower end of the outer layer pipe of the tracing heat pipe is connected to the first drain pipe. The second steam branch pipe is connected to the top of the interlayer of the tracing heat preservation kettle. The bottom of the interlayer of the tracing heat preservation kettle is connected to the second drain pipe. A thermometer and a steam trap are respectively arranged on the first drain pipe and the second drain pipe according to the liquid flow direction. The steam trap has the function of draining water and blocking steam. The inlet of the kettle body of the tracing heat preservation kettle is connected to the liquid inlet pipe. The outlet of the kettle body of the tracing heat preservation kettle is connected to the inlet of the liquid pump. The outlet of the liquid pump is connected to the lower end of the inner layer pipe of the tracing heat pipe. The upper end of the inner layer pipe of the tracing heat pipe is connected to the granulator nozzle. The steam after pressure reduction enters the outer layer pipe of the tracing heat pipe from the upper end of the tracing heat pipe to heat and insulate the concentrated calcium solution. The steam enters the first drain pipe from the lower end of the outer layer pipe of the tracing heat pipe. The liquid water is discharged through the steam trap on the first drain pipe. The temperature in the first drain pipe is 170°C to 180°C.

2. The high-concentration calcium liquid pipeline tracing device according to claim 1, wherein The pressure of the supersaturated steam in the steam pipe is 1.5 MPa.

3. The high-concentration calcium solution pipeline tracing device according to claim 1, wherein, A pressure reducing valve, a pressure gauge and a thermometer are respectively arranged on the first steam branch pipe and the second steam branch pipe.

4. The high-concentration calcium solution pipeline tracing device according to claim 3, characterized in that, The pressure after pressure reduction of the first steam branch pipe and the second steam branch pipe is 0.85 to 0.95 MPa.

5. The high-concentration calcium solution pipeline tracing device according to claim 1, characterized in that The steam temperature in the steam pipe is 180°C to 190°C.

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