Heat tracing device for liquid sulfur trioxide pipeline

Abstract

A liquid sulfur trioxide pipeline heat tracing device comprises a hot water tank, a heat tracing water pump, a heat tracing water inlet header pipe, a heat tracing water return header pipe, a heat tracing water inlet branch pipe, a heat tracing water return branch pipe, a desalted water supplementing pipe, a hot water tank steam inlet pipe, a heating coil pipe, an emptying pipe, a blow-off pipe and the like. Steam is used for heating desalted water in a hot water tank, and the temperature and the liquid level of the hot water tank are controlled through a regulating valve; then the heat tracing water is conveyed to a heat tracing water main pipe through a heat tracing water pump, a heat tracing water branch pipe is separated from the main pipe to conduct heat tracing on the liquid sulfur trioxide pipeline, it is guaranteed that the liquid sulfur trioxide in the liquid sulfur trioxide pipeline is not solidified or gasified, the heat-tracing water returns to a heat tracing water return main pipe through the branch pipe, and cyclic utilization is achieved. The device is simple in structure, stable, safe and reliable in process technology, good in effect, low in energy consumption, capable of keeping the temperature of liquid sulfur trioxide in the pipeline stable for a long time, suitable for long-distance and short-distance safe conveying and easy to industrially popularize and apply.

Description

Technical Field

[0001] The utility model belongs to the field of liquid sulfur trioxide pipeline heating, and in particular relates to a liquid sulfur trioxide pipeline heating device. Background Art

[0002] With the localization of chips and the expansion of the market for electronic-grade sulfuric acid, there are more and more liquid sulfur trioxide devices used to prepare the main material for electronic-grade sulfuric acid, which inevitably involves pipeline transportation of liquid sulfur trioxide. Liquid sulfur trioxide is a material with a boiling point and a freezing point that are very close, and has very strict temperature requirements. When the temperature is below 30°C, crystallization will begin to appear locally, and when the temperature is above 42°C, it will begin to vaporize. The crystallization of liquid sulfur trioxide will not only clog the pipeline valves, but also form different crystals that are difficult to thaw. The vaporization of liquid sulfur trioxide will cause the volume to increase and the pressure to rise, making it impossible to transport materials, and even causing leakage of the connecting flange to form a safety and environmental accident. Therefore, the study of a liquid sulfur trioxide pipeline heating device is a necessary and beneficial measure to maintain the stability of material properties and ensure material transportation and safety and environmental protection. Summary of the invention

[0003] The invention solves the problem that when sulfur trioxide is transported through a pipeline, the pipeline is unstable and unsafe because the sulfur trioxide is easily gasified or crystallized.

[0004] The utility model aims to provide a liquid sulfur trioxide pipeline heating device with simple structure, stable, safe and reliable process technology, good effect and low energy consumption, which can keep the temperature of liquid sulfur trioxide in the pipeline stable for a long time and realize safe transportation over long and short distances.

[0005] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0006] A liquid sulfur trioxide pipeline heating device, a desalted water feed pipe is connected to the top of a hot water tank, a breathing port is arranged on the top of the hot water tank, the bottom of the hot water tank is connected to a hot water tank steam inlet pipe, the hot water tank steam inlet pipe is connected to a heating coil; the hot water tank is also connected to a heating water pump, the hot water pump is connected to a heating water inlet main pipe; the heating water inlet main pipe is connected to a heating water inlet branch pipe; the heating water inlet branch pipe is laid in parallel with the liquid sulfur trioxide pipeline, the heating water inlet branch pipe is connected to a heating water return branch pipe, the heating water return branch pipe is connected to a heating water return main pipe, the heating water return branch pipe is also connected to a drain pipe, the heating water return main pipe is connected to the hot water tank, and the heating water return main pipe is also connected to an external delivery pipe.

[0007] The third regulating valve is installed on the steam inlet pipe of the hot water tank. The first remote thermometer and the remote liquid level gauge are installed on the hot water tank. The pipe connecting the hot water tank to the heating water pump is equipped with an inlet valve. The pipe connecting the heating water pump to the heating water inlet main pipe is equipped with a pressure gauge, a check valve, and an outlet valve. The heating water inlet branch pipe is equipped with a water inlet ball valve. The heating water return branch pipe is equipped with a return water ball valve. The heating water return main pipe is equipped with a third remote thermometer, a fourth remote thermometer, and a fifth remote thermometer. The external delivery pipe is equipped with a first regulating valve. The desalted water supply pipe is equipped with a second regulating valve.

[0008] Preferably, a second remote thermometer is provided at the outlet of the heat trace water pump.

[0009] Preferably, a drain valve is provided on the drain pipe.

[0010] Preferably, the hot water tank, the desalted water feed pipe, the hot water tank steam inlet pipe, the sewage pipe, the heating water pump, the heating water inlet main pipe, the heating water return main pipe and the heating coil are made of 304 or 316 stainless steel.

[0011] Preferably, the inlet valve, check valve, outlet valve, regulating valve and drain valve are made of 304 or 316 stainless steel.

[0012] Preferably, the heating water inlet branch pipe, the heating water return branch pipe and the drain pipe are made of DN15-DN25 stainless steel.

[0013] Preferably, the water inlet ball valve of the heating water inlet branch pipe, the water return ball valve of the heating water return branch pipe, and the drain valve on the drain pipe all adopt internal threaded ball valves with handles.

[0014] Preferably, the heating water inlet branch pipe is laid in parallel with the liquid sulfur trioxide pipeline.

[0015] Preferably, the liquid sulfur trioxide pipeline is horizontal, and the heating water inlet branch pipe is installed at 135° or 225° below the liquid sulfur trioxide pipeline.

[0016] Preferably, the heating length of each heating water inlet branch pipe for the liquid sulfur trioxide pipeline is 10-30 meters.

[0017] Preferably, the heating water inlet branch pipe passes through the valve or pipe fitting of the liquid sulfur trioxide pipeline, and the heating water inlet branch pipe is laid along its outer shape.

[0018] Preferably, the heating water inlet branch pipe is fixed to the liquid sulfur trioxide pipeline by bundling with stainless steel tie bands or steel wires, and the bundling spacing of the heating water inlet branch pipe is 1.0-1.5 meters.

[0019] Preferably, the outside of the heating water inlet branch pipe and the liquid sulfur trioxide pipeline is insulated with aluminum silicate insulation cotton.

[0020] Preferably, the heating return water main pipe is provided with a third remote thermometer, a fourth remote thermometer and a fifth remote thermometer every 30-50 meters.

[0021] Preferably, the heating coil in the tank is arranged horizontally in a DN50 single-layer circular shape; a 10 mm circular hole is opened in the heating coil at 45° and 315° directions every 30-60 mm.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The liquid sulfur trioxide pipeline heating device of the utility model uses steam to heat the desalted water in the hot water tank, and controls the temperature and liquid level of the hot water tank through the second regulating valve; then the water is pumped to the hot water main pipe through the hot water pump, and a hot water branch pipe is separated from the main pipe to heat the liquid sulfur trioxide pipeline, so as to ensure that the liquid sulfur trioxide in the liquid sulfur trioxide pipeline does not solidify or vaporize, and the heated water returns to the heating return water main pipe through the branch pipe to realize recycling.

[0024] 2. In the utility model, the hot water in the hot water tank is pressurized by the hot water pump and then sent to the heating water inlet main pipe. The heating water inlet main pipe branches out multiple heating water inlet branch pipes to heat the liquid sulfur trioxide pipeline. After the heating is completed, the hot water is collected to the heating water return main pipe through the heating return branch pipes, and then returned to the hot water tank or discharged to the outside through the first regulating valve to adjust the external delivery pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of a liquid sulfur trioxide pipeline heating device;

[0026] Figure numerals: hot water tank 1, hot water pump 2, inlet valve 3, check valve 4, outlet valve 5, first remote thermometer 6, pressure gauge 7, heating water inlet main pipe 8, liquid sulfur trioxide pipeline 9, heating water inlet branch pipe 10, water inlet ball valve 11, return water ball valve 12, heating return water branch pipe 13, drain pipe 14, drain valve 15, heating return water main pipe 16, external pipe 17, first regulating valve 18, desalted water make-up pipe 19, hot water tank steam inlet pipe 20, remote liquid level gauge 21, drain pipe 22, drain valve 23, breathing port 24, heating coil 25, second regulating valve 26, third regulating valve 27, second remote thermometer 28, third remote thermometer 29, fourth remote thermometer 30, fifth remote thermometer 31. DETAILED DESCRIPTION

[0027] Example 1

[0028] The utility model is further described below in conjunction with the accompanying drawings:

[0029] A liquid sulfur trioxide pipeline heating device, such as Figure 1As shown, the hot water in the hot water tank 1 is pressurized by the hot water pump 2 and then sent to the heating water inlet main pipe 8. The heating water inlet main pipe 8 branches out a heating water inlet branch pipe 10. The heating water inlet branch pipe 10 heats the liquid sulfur trioxide pipeline 9. After the heating is completed, the hot water in the heating water inlet branch pipe 10 is collected to the heating water return main pipe 16 through the connected heating return branch pipe 13, and then returns to the hot water tank 1 or is returned to the outside through the external delivery pipe 17 by the first regulating valve 18.

[0030] An inlet valve 3 is provided on the pipeline between the hot water tank 1 and the heat pump 2; the heat pump is provided with a check valve 4, an outlet valve 5 and a pressure gauge 7, and a remote thermometer 6 is provided at the outlet of the heat pump 2. The heat inlet branch pipe 10 is provided with a water inlet ball valve 11, and the heat return branch pipe 13 is provided with a return water ball valve 12; a drain valve 15 is provided on the drain pipe 14. The hot water tank 1 is provided with a desalted water replenishment pipe 19, a second regulating valve 26, a regulating valve 18, a hot water tank steam inlet pipe 20, a third regulating valve 27, a heating coil 25, a remote thermometer 6, a remote liquid level gauge 21, a breathing port 24, a sewage pipe 22 and a sewage valve 23. The hot water tank 1, the heating water pump 2, the heating water inlet main pipe 8, the heating water return main pipe 16, the heating coil 25, the inlet valve 3, the check valve 4, the outlet valve 5, the return water ball valve 12, the drain valve 15, the regulating valve 18 and the sewage valve 23 are all made of 304 or 316 stainless steel; the heating water pump 2 adopts frequency conversion control.

[0031] The water inlet ball valve 11 provided on the heating water inlet branch pipe 10, the water return ball valve 12 provided on the heating water return branch pipe 13, and the drain valve 15 provided on the drain pipe 14 are internal threaded ball valves with handles. The heating water inlet branch pipe 10, the heating water return branch pipe 13 and the drain pipe 14 are made of DN15-DN25 stainless steel.

[0032] The heating water inlet branch pipe 10 is laid parallel to the liquid sulfur trioxide pipeline 9, the liquid sulfur trioxide pipeline 9 is horizontal, and the heating water inlet branch pipe 10 is installed at 135° or 225° below the liquid sulfur trioxide pipeline 9. The heating length of each heating pipe water inlet branch pipe 10 for the liquid sulfur trioxide pipeline 9 is 10-30 meters; the length of the liquid sulfur trioxide pipeline 9 is 80m. Preferably, three heating water inlet branches 10 and three heating return water branches 13 are set, such as Figure 1 Each heating water inlet branch pipe 10 is connected to a corresponding heating water return branch pipe 13; the heating water inlet branch pipe 10 passes through the valve or pipe fitting of the liquid sulfur trioxide pipeline 9, and the heating water inlet branch pipe 10 is laid along its shape to avoid or reduce U-shaped bends. The heating water inlet branch pipe 10 is fixed to the liquid sulfur trioxide pipeline 9 by stainless steel tie bands or steel wires, and the bundling spacing of the heating water inlet branch pipe 10 is 1.0-1.5 meters. The heating water inlet branch pipe 10 and the liquid sulfur trioxide pipeline 9 are insulated by aluminum silicate insulation cotton.

[0033] The third remote thermometer 29, the fourth remote thermometer 30, and the fifth remote thermometer 31 are respectively arranged every 30-50 meters on the heat return main pipe 16, and the heating effect of the liquid sulfur trioxide pipeline 9 is monitored by the temperature of each section on the heat return main pipe 16. The steam inlet of the hot water tank 1 adopts saturated steam of 0.2-0.6Mpa, and the heating coil 25 in the hot water tank 1 adopts a DN50 single-layer circular horizontal arrangement. The heating coil 25 opens a 10mm circular hole at 45° and 315° every 30-60mm. The temperature of the hot water tank 1 is controlled between 50-60℃, and the liquid level is controlled at 1.5-2.5 meters.

[0034] The implementation methods disclosed in the present utility model are detailed descriptions of the device of the present application, rather than limitations of the present application. As long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed in the present utility model.

Claims

1. A liquid sulfur trioxide pipeline heating device, characterized in that: The desalted water replenishment pipe (19) is connected to the top of the hot water tank (1), and a breathing port (24) is provided on the top of the hot water tank (1). The bottom of the hot water tank (1) is connected to the hot water tank steam inlet pipe (20), and the hot water tank steam inlet pipe (20) is connected to the heating coil (25). The hot water tank (1) is also connected to the hot water pump (2), and the hot water pump (2) is connected to the heating water inlet main pipe (8). The heating water inlet main pipe (8) is connected to the heating water inlet branch pipe (10). The heating water inlet branch pipe (10) is laid parallel to the liquid sulfur trioxide pipeline (9), and the heating water inlet branch pipe (10) is connected to the heating water return branch pipe (13), and the heating water return branch pipe (13) is connected to the heating water return main pipe (16). The heating water return branch pipe (13) is also connected to the drainage pipe (14), and the heating water return main pipe (16) is connected to the hot water tank (1), and the heating water return main pipe (16) is also connected to the external delivery pipe (17).

2. The sulfur trioxide pipeline heating device according to claim 1, characterized in that: A third regulating valve (27) is installed on the hot water tank steam inlet pipe (20).

3. The sulfur trioxide pipeline heating device according to claim 1, characterized in that: The hot water tank (1) is provided with a first remote thermometer (6) and a remote liquid level meter (21).

4. The sulfur trioxide pipeline heating device according to claim 1, characterized in that: An inlet valve (3) is installed on the pipe connecting the hot water tank (1) to the hot water pump (2).

5. The sulfur trioxide pipeline heating device according to claim 1, characterized in that: A pressure gauge (7), a check valve (4) and an outlet valve (5) are provided on a pipe connecting the heat-tracing water pump (2) to the heat-tracing water inlet main pipe (8).

6. The sulfur trioxide pipeline heating device according to claim 1, characterized in that: A water inlet ball valve (11) is installed on the heating water inlet branch pipe (10).

7. The sulfur trioxide pipeline heating device according to claim 1, characterized in that: A return water ball valve (12) is installed on the heating return water branch pipe (13).

8. The sulfur trioxide pipeline heating device according to claim 1, characterized in that: A third remote thermometer (29), a fourth remote thermometer (30) and a fifth remote thermometer (31) are installed on the heat return water main pipe (16).

9. The sulfur trioxide pipeline heating device according to claim 1, characterized in that: The external delivery pipe (17) is provided with a first regulating valve (18).

10. The sulfur trioxide pipeline heating device according to claim 1, characterized in that: A second regulating valve (26) is installed on the desalted water replenishment pipe (19).

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