Constant-temperature cooling device for extra-high-temperature pump of oil refining device

Abstract

The utility model discloses a constant-temperature cooling device for an extra-high-temperature pump of an oil refining device, which comprises a high-temperature pump, the high-temperature pump comprises a motor, a coupler and a pump body, the outer side of the pump body is provided with a pump shell with a jacket, and the pump shell with the jacket is provided with a water inlet and a water outlet; the water inlet is connected with a water inlet pipeline, and the water outlet is connected with a water outlet pipeline; a thermal resistor is arranged on the pump shell with the jacket, the thermal resistor is in signal connection with the DCS control cabinet, the DCS control cabinet is in signal connection with the pneumatic control valve, the pneumatic control valve is arranged on the water outlet pipeline, and the pneumatic valve, the DCS control cabinet and the thermal resistor form an electric loop. The device is low in manufacturing cost, simple to install and operate, reliable to use and convenient to maintain, solves the problem that the high-temperature pump of the oil refining device cannot be used due to cavitation, surge and overheat damage of the mechanical seal, reduces the temperature of the pump shell and the mechanical seal, prolongs the service life of the mechanical seal, and reduces the pressure impact on an atmospheric and vacuum distillation unit.

Description

Technical Field

[0001] This utility model relates to the field of high-temperature pump cooling devices, specifically a constant-temperature cooling device for an ultra-high-temperature pump in an oil refining unit. Background Technology

[0002] The pump casing of a high-temperature pump in an oil refining unit consists of several components, and its internal cavity forms an impeller working chamber, a suction chamber, and a pressure chamber. The shape and size of the pump casing depend on the impeller structure and dimensions, as well as the shape and dimensions of the suction and pressure chambers, which are determined by the medium force design. The pump casing is jacketless, and its high efficiency, energy saving, reliable quality, and wide range of applications have made it popular among users.

[0003] The pump body operating temperature is generally in the range of 200℃-300℃. However, in the case of high-temperature media of 325℃ in oil refining units, the water in the asphalt will vaporize due to the excessively high temperature of the transport medium. This will cause the pump to frequently experience cavitation, surge, and overheating damage to the mechanical seal, resulting in problems such as the pump being unable to operate normally.

[0004] Existing technologies for dealing with cavitation and surge in high-temperature pumps of oil refining units due to excessively high medium temperatures involve artificially cooling the pump body by connecting cooling water to a rubber hose. This method is not only time-consuming and labor-intensive, but also increases the risk of burns to personnel during manual cooling. Furthermore, the mechanical seal may fail after only four months of use due to excessively high temperatures. Current maintenance methods require shutting down the pump and replacing the mechanical seal, which is time-consuming, involves complicated medium replacement, and causes subsequent processes to shut down due to the inability to supply raw materials. Ultimately, this results in substandard product quality, increases production costs, and is both time-consuming and labor-intensive. Utility Model Content

[0005] The purpose of this utility model is to provide a constant temperature cooling device for ultra-high temperature pumps in oil refining units, so as to solve the problems in the prior art that the pump body still needs to be manually cooled by water flushing and that the maintenance of pneumatic shut-off valves is complicated, time-consuming and labor-intensive.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A constant-temperature cooling device for an ultra-high temperature pump in an oil refining unit includes a high-temperature pump, which comprises a motor, a coupling, and a pump body. The pump body has a jacketed pump casing on its outer side, with an inlet and an outlet. The inlet is connected to an inlet pipe, and the outlet is connected to an outlet pipe. A thermal resistor is installed on the jacketed pump casing, and the thermal resistor is signal-connected to a DCS control cabinet. The DCS control cabinet is signal-connected to a pneumatic regulating valve. A pneumatic regulating valve is installed on the outlet pipe, and the pneumatic valve forms an electrical circuit with the DCS control cabinet and the thermal resistor. By adding a jacket to the pump body, cooling water circulates within the jacket, achieving the function of cooling the pump casing and mechanical seal.

[0008] Furthermore, two second shut-off valves are provided on the water outlet pipeline, and the pneumatic regulating valve is located on the water outlet pipeline between the two second shut-off valves: by adding the second shut-off valve, it is more convenient to perform online maintenance or replace the pneumatic regulating valve without having to stop production for too long.

[0009] Furthermore, a first shut-off valve is provided on the water inlet pipe, and the Y-type filter is located downstream of the first shut-off valve; by adding the first shut-off valve, the filter element of the Y-type filter can be easily replaced.

[0010] Furthermore, a Y-type filter is installed on the water inlet pipe; by installing a Y-type filter on the cooling water pipe, the problem of sludge and impurities in the cooling water clogging the cooling water pipe and the jacket of the jacketed pump casing is effectively solved, preventing the cooling function from failing.

[0011] Furthermore, the water inlet end of the water inlet pipe is connected to a cooling water supply main pipe.

[0012] Furthermore, the outlet end of the water outlet pipe is connected to a cooling water return main pipe.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. The device with a jacketed pump casing uses the jacket function to allow cooling water to circulate within the jacket, thereby cooling the pump casing and mechanical seal and significantly extending the pump's service life.

[0015] 2. The remote transmission signals from the pneumatic regulating valve and the thermal resistor are sent to the DCS. Through the DCS programming function, PID control of the pneumatic regulating valve and the thermal resistor signals can be realized, achieving the effect of constant temperature water cooling of the high temperature pump in the oil refining unit, and realizing the automation of temperature control.

[0016] 3. The addition of a thermal resistor can monitor the pump casing temperature data and transmit it back to the DCS control system. When the temperature exceeds the system set temperature, the DCS control system can adjust the pneumatic shut-off valve to increase the chilled water flow for cooling. The DCS control system can also view the historical curve of the pump casing temperature to check the pump's operating status, allowing for timely detection and maintenance of any abnormalities.

[0017] 4. The addition of a second shut-off valve makes it easier to repair or replace the pneumatic control valve, reducing downtime and production time, thereby lowering production costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] In the diagram, 1-motor, 2-coupling, 3-pump body, 4-pump casing with jacket, 5-inlet, 6-outlet, 7-inlet pipe, 8-first shut-off valve, 9-Y-type filter, 10-cooling water supply main pipe, 11-outlet pipe, 12-pneumatic regulating valve, 13-second shut-off valve, 14-cooling water return main pipe, 15-thermal resistance, 16-DCS control cabinet; Detailed Implementation

[0020] like Figure 1 As shown, this utility model discloses a constant temperature cooling device for an ultra-high temperature pump in an oil refining unit. The device includes a high-temperature pump, which comprises a motor 1, a coupling 2, and a pump body 3. A jacketed pump casing 4 for cooling is provided on the outside of the pump body 3. The jacketed pump casing 4 employs conventional technology in this field; for details, please refer to the utility model with publication number CN215214122U. The jacketed pump casing 4 has an inlet 5 and an outlet 6. The inlet 5 is connected to an inlet pipe 7, and the inlet end of the inlet pipe 7 is connected to a cooling water supply main pipe 10. A first shut-off valve 8 is provided on the inlet pipe 7, located upstream of a Y-type filter 9, for convenient replacement of the filter element of the Y-type filter 9. The inlet pipe 7 also has a Y-type filter 9, which is used to filter sludge and impurities in the cooling water, preventing blockage of the cooling water pipe and the jacketed pump casing 4. The outlet 6 is connected to the outlet pipe 11, and the outlet end of the outlet pipe 11 is connected to the cooling water return main pipe 14. Two second shut-off valves 13 are provided on the outlet pipe 11. The pneumatic regulating valve 12 is located on the outlet pipe 11 between the two second shut-off valves 13. When the pneumatic shut-off valve needs to be repaired or replaced, the two second shut-off valves 13 are closed before the pneumatic shut-off valve is repaired or replaced. A resistance temperature detector (RTD) 15 is installed on the jacketed pump casing 4. The RTD 15 is connected to the DCS control cabinet 16 via signal transmission. The DCS control cabinet 16 is also connected to the pneumatic regulating valve 12 via signal transmission. The signals from the pneumatic regulating valve 12 and the RTD 15 enter the DCS control cabinet 16. The DCS system uses Emerson DeltaAV, which can achieve PID control of the signals from the pneumatic regulating valve 12 and the RTD 15 to achieve constant temperature water cooling for the high-temperature pump in the oil refining unit. The control loop of the pneumatic regulating valve 12 is set to automatic. When the temperature is higher than the set value, the opening of the pneumatic regulating valve 12 increases, accelerating the circulation of cooling water. When the temperature is lower than the set value, the opening of the pneumatic regulating valve 12 decreases, reducing the circulation of cooling water. The addition of the RTD 15 not only allows for PID control with the pneumatic regulating valve 12 but also records the pump casing temperature data, facilitating mechanical inspection and review of the historical temperature curve of the pump casing to check the pump's operating status.

[0021] The method of using this utility model is as follows:

[0022] When the high-temperature pump is working, the first shut-off valve 8 is opened, and cooling water enters the inlet pipe 7 from the cooling water supply main pipe 10. The cooling water flows through the first shut-off valve 8 and the Y-type filter 9, and enters the jacketed pump casing 4 from the inlet 5. The cooling water circulates in the jacket, cools the pump body 3 and the mechanical seal of the pump casing, and then flows out from the jacket outlet 6, into the outlet pipe 11, and then flows through the second shut-off valve 13, the pneumatic regulating valve 12, and finally into the cooling water return main pipe 14.

[0023] When the filter element of Y-type filter 9 needs to be replaced, simply close the first shut-off valve 8 to perform the replacement.

[0024] In the DCS control cabinet 16, the peak temperature of the jacketed pump housing 4 is set to 275℃. The jacketed pump housing 4 is equipped with a thermal resistor 15. When the thermal resistor 15 detects that the temperature of the jacketed pump housing 4 exceeds the set peak temperature of 275℃, the thermal resistor 15 transmits a signal back to the DCS control cabinet 16. The DCS control cabinet 16 controls the pneumatic regulating valve 12 to increase the opening degree, thereby accelerating the circulation of cooling water. When the temperature is below 275℃, the pneumatic regulating valve 12 decreases the opening degree, thereby reducing the circulation of cooling water.

[0025] When the pneumatic shut-off valve needs maintenance or replacement, the two second shut-off valves 13 upstream and downstream of the pneumatic shut-off valve can be closed before maintenance can be carried out.

[0026] This utility model device has a low cost, is simple to install and operate, is reliable in use, and is easy to maintain. It effectively solves the problems of frequent cavitation, surge, and mechanical seal overheating damage that renders the pump unusable when high-temperature pumps in oil refining units pass through high-temperature media. It effectively reduces the temperature of the pump casing and mechanical seal, which not only extends the service life of the mechanical seal by several times, but also reduces the pressure impact on the atmospheric and vacuum distillation unit. It effectively eliminates the risk of burns to personnel when manually cooling the pump body due to overheating, and ensures the pass rate of the process products.

Claims

1. A constant-temperature cooling device for an ultra-high temperature pump in an oil refining unit, comprising a high-temperature pump, wherein the high-temperature pump includes a motor (1), a coupling (2), and a pump body (3), characterized in that, The pump body (3) is provided with a jacketed pump casing (4) on the outside. The jacketed pump casing (4) is provided with an inlet (5) and an outlet (6). The inlet (5) is connected to an inlet pipe (7), and the outlet (6) is connected to an outlet pipe (11). The jacketed pump casing (4) is provided with a thermal resistor (15). The thermal resistor (15) is connected to the DCS control cabinet (16) by signal. The DCS control cabinet (16) is connected to the pneumatic regulating valve by signal. The outlet pipe (11) is provided with a pneumatic regulating valve (12). The pneumatic valve then forms an electrical circuit with the DCS control cabinet (16) and the thermal resistor (15).

2. The constant temperature cooling device for an ultra-high temperature pump in an oil refining unit according to claim 1, characterized in that, The water outlet pipe (11) is provided with two second shut-off valves (13), and the pneumatic regulating valve (12) is located on the water outlet pipe (11) between the two second shut-off valves (13).

3. The constant-temperature cooling device for an ultra-high temperature pump in an oil refining unit according to claim 1, characterized in that, The water inlet pipe (7) is equipped with a first shut-off valve (8).

4. The constant-temperature cooling device for an ultra-high temperature pump in an oil refining unit according to claim 1, characterized in that, The water inlet pipe (7) is equipped with a Y-type filter (9), which is located downstream of the first shut-off valve (8).

5. The constant-temperature cooling device for an ultra-high temperature pump in an oil refining unit according to claim 1, characterized in that, The water inlet pipe (7) is connected to the cooling water supply main pipe (10) at the water inlet end.

6. The constant-temperature cooling device for an ultra-high temperature pump in an oil refining unit according to claim 1, characterized in that, The outlet end of the water outlet pipe (11) is connected to the cooling water return main pipe (14).

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