Lubricating oil temperature regulation control device of air separation unit

Abstract

The utility model discloses an air separation unit lubricating oil temperature regulation control device, which is characterized in that an oil cooler of an air separation unit is connected with a circulating water return pipe and a lubricating oil external supply pipeline, and the circulating water return pipe is provided with a manual control valve; the device comprises a bypass pipeline, a pneumatic control valve, a valve positioner, a temperature measuring point element and a temperature sensor. Two ends of the bypass pipeline are connected with the circulating water return pipe, and two connecting points are respectively positioned at the upstream and the downstream of the manual control valve; the bypass pipeline is provided with a pneumatic control valve, the pneumatic control valve is connected with a valve positioner, and the valve positioner is connected with a temperature sensor; a temperature measuring point element is arranged on the lubricating oil external supply pipeline, and the temperature sensor is connected with the temperature measuring point element. The device has the advantages that the lubricating oil temperature can be intelligently adjusted, the working efficiency of an air separation unit is improved, and continuous and stable operation of steam turbines and other equipment is guaranteed. Manual adjustment of operators is not needed, the automation degree is improved, and labor is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil temperature control and regulation, in particular to a lubricating oil temperature regulation and control device for an air separation unit. Background Art

[0002] The air separation unit is powered by steam and mainly produces oxygen and nitrogen, with by-products such as liquid oxygen, liquid nitrogen, and liquid argon, supplying oxygen and nitrogen to the main production system. At present, the lubricating oil temperature of the air separation unit is manually adjusted and controlled by the on-site operator through the oil cooler circulating water valve. This adjustment method has three disadvantages:

[0003] 1. When the ambient temperature changes, the circulating water temperature changes accordingly. At this time, the lubricating oil temperature needs to be adjusted frequently by the on-site operators, which increases the workload.

[0004] 2. The manual adjustment accuracy is low and the oil temperature fluctuates greatly, resulting in low lubrication efficiency of the unit, which is not conducive to the long-term stable operation of the unit.

[0005] 3. Once a manual valve failure occurs, the oil temperature cannot be adjusted, affecting the operation of the unit. In severe cases, it may cause the unit to interlock and trip, and the production system to stop. Utility Model Content

[0006] The utility model aims to provide a temperature regulating and controlling device for lubricating oil of an air separation unit, so as to solve the above-mentioned problems existing in the prior art.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0008] A lubricating oil temperature regulating and controlling device for an air separation unit, wherein a circulating water return pipe and a lubricating oil external supply pipeline for conveying lubricating oil to a lubricating oil tank are connected to an oil cooler of the air separation unit, and a manual control valve is arranged on the circulating water return pipe; the device comprises a bypass pipeline, a pneumatic regulating valve, a valve positioner, a temperature measuring point element and a temperature sensor; both ends of the bypass pipeline are connected to the circulating water return pipe, and two connection points are respectively located upstream and downstream of the manual control valve; a pneumatic regulating valve is arranged on the bypass pipeline, and the pneumatic regulating valve is connected to the valve positioner, and the valve positioner is connected to the temperature sensor; a temperature measuring point element is arranged on the lubricating oil external supply pipeline, and the temperature sensor is connected to the temperature measuring point element.

[0009] Preferably, the device further comprises a temperature display instrument, and the temperature measuring point element is connected to the temperature sensor via the temperature display instrument.

[0010] Preferably, a front stop valve and a rear stop valve are further provided on the bypass pipeline, and the front stop valve and the rear stop valve are respectively located upstream and downstream of the pneumatic regulating valve.

[0011] Preferably, the air separation unit includes an oil cooler, a lubricating oil tank, a steam turbine, a compressor and a filter; the water inlet and water outlet of the oil cooler are respectively connected to the circulating water supply pipe and the circulating water outlet pipe; the oil inlet and oil outlet of the oil cooler are respectively connected to the filter and the lubricating oil tank via the lubricating oil return pipeline and the lubricating oil external supply pipeline, the lubricating oil tank is connected to the oil inlet end of the steam turbine via the lubricating oil pump, and the oil inlet end and oil outlet end of the steam turbine are both connected to the filter; the steam turbine is connected to the compressor.

[0012] The beneficial effects of the utility model are as follows: 1. By adding a bypass pipe to the circulating water return pipe, and setting a temperature measuring element, a temperature sensor, and a pneumatic regulating valve on the lubricating oil external supply pipe and the bypass pipe, the lubricating oil temperature can be automatically detected, and the water volume of the circulating water return pipe can be adjusted in real time according to the temperature signal, thereby adjusting the lubricating oil temperature to be within a reasonable range. 2. The device can realize intelligent adjustment of the lubricating oil temperature, improve the working efficiency of the air separation unit, and ensure the continuous and stable operation of equipment such as steam turbines. There is no need for manual adjustment by the operator, which improves the degree of automation and saves labor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the temperature adjustment control device in the embodiment of the utility model;

[0014] Figure 2 It is a connection diagram between the temperature control device and the air separation unit in the embodiment of the utility model. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation methods described here are only used to explain the utility model and are not used to limit the utility model.

[0016] like Figure 1 and Figure 2 As shown, in this embodiment, a lubricating oil temperature regulating and controlling device for an air separation unit is provided. A circulating water return pipe and a lubricating oil external supply pipeline for conveying lubricating oil to a lubricating oil tank are connected to the oil cooler of the air separation unit. A manual control valve ( Figure 1 V1 in the device includes a bypass line, a pneumatic regulating valve ( Figure 1 F0 in), valve positioner ( Figure 1 TY1000 in), temperature measuring point element ( Figure 1 TE1000) and temperature sensor ( Figure 1TI C1000 in the bypass pipeline); both ends of the bypass pipeline are connected to the circulating water return pipe, and the two connection points are respectively located upstream and downstream of the manual control valve; the bypass pipeline is provided with front stop valves ( Figure 1 V3 in), pneumatic control valve ( Figure 1 F0 in) and rear stop valve ( Figure 1 V2 in the figure), the pneumatic regulating valve is connected to the valve positioner, the valve positioner is connected to the temperature sensor; a temperature measuring point element is arranged on the lubricating oil external supply pipeline, and the temperature sensor is connected to the temperature measuring point element.

[0017] In this embodiment, the device also includes a temperature display instrument ( Figure 1 The temperature measuring point element is connected to the temperature sensor via a temperature display instrument. The temperature display instrument is used to display the temperature of the lubricating oil in the current lubricating oil external supply pipeline.

[0018] In this embodiment, the front stop valve and the rear stop valve on the bypass pipeline are respectively located upstream and downstream of the pneumatic regulating valve.

[0019] In this embodiment, the temperature measuring point element detects the temperature of the lubricating oil in the lubricating oil external supply pipeline in real time. When the temperature of the lubricating oil is not within the set threshold range, the temperature measuring point element sends a signal and the current temperature value to the temperature sensor. The temperature sensor sends the signal to the valve positioner. The valve positioner adjusts the opening of the pneumatic regulating valve, thereby controlling the flow of the circulating water return pipe, thereby changing the oil temperature of the lubricating oil, and then making the lubricating oil in the lubricating oil external supply pipeline within a suitable oil temperature range.

[0020] The manual control valve is manually opened to an appropriate degree according to seasonal temperature changes. The front stop valve and rear stop valve before and after the pneumatic control valve remain fully open. When the pneumatic control valve fails, the corresponding stop valve or manual control valve can be manually controlled to ensure the normal operation of the air separation unit.

[0021] In this embodiment, Figure 2 The connection relationship diagram of the air separation unit and the temperature control device shown in the figure. In the figure, the air separation unit includes an oil cooler, a lubricating oil tank, a steam turbine, a compressor and a filter; the water inlet and outlet of the oil cooler are respectively connected to the circulating water upper pipe and the circulating water outlet pipe; the oil inlet and oil outlet of the oil cooler are respectively connected to the filter and the lubricating oil tank through the lubricating oil return pipeline and the lubricating oil external supply pipeline, the lubricating oil tank is connected to the oil inlet end of the steam turbine through the lubricating oil pump, and the oil inlet end and oil outlet end of the steam turbine are both connected to the filter; the steam turbine is connected to the compressor. A lubricating oil pump is also provided on the lubricating oil external supply pipeline. Corresponding control valves are provided on the connecting pipelines of the relevant components in the air separation unit to control the on-off of the pipeline.

[0022] By adopting the above technical solution disclosed in the utility model, the following beneficial effects are obtained:

[0023] The utility model discloses a temperature control device for lubricating oil of an air separation unit. By adding a bypass pipe to the circulating water return pipe, and setting a temperature measuring element, a temperature sensor, and a pneumatic regulating valve on the lubricating oil external supply pipe and the bypass pipe, the lubricating oil temperature can be automatically detected, and the water volume of the circulating water return pipe can be adjusted in real time according to the temperature signal, thereby adjusting the lubricating oil temperature to be within a reasonable range. The device can realize intelligent regulation of the lubricating oil temperature, improve the working efficiency of the air separation unit, and ensure the continuous and stable operation of equipment such as steam turbines. There is no need for manual adjustment by operators, which improves the degree of automation and saves labor.

[0024] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. A temperature control device for lubricating oil of an air separation unit, wherein a circulating water return pipe and a lubricating oil external supply pipeline for conveying lubricating oil to a lubricating oil tank are connected to the oil cooler of the air separation unit, and a manual control valve is arranged on the circulating water return pipe; the characteristics are: The device includes a bypass pipeline, a pneumatic regulating valve, a valve positioner, a temperature measuring point element and a temperature sensor; both ends of the bypass pipeline are connected to the circulating water return pipe, and the two connection points are respectively located upstream and downstream of the manual control valve; a pneumatic regulating valve is arranged on the bypass pipeline, the pneumatic regulating valve is connected to the valve positioner, and the valve positioner is connected to the temperature sensor; a temperature measuring point element is arranged on the lubricating oil external supply pipeline, and the temperature sensor is connected to the temperature measuring point element.

2. The air separation unit lubricating oil temperature regulating and controlling device according to claim 1 is characterized in that: The device also includes a temperature display instrument, and the temperature measuring point element is connected to the temperature sensor via the temperature display instrument.

3. The air separation unit lubricating oil temperature regulating and controlling device according to claim 1 is characterized in that: The bypass pipeline is also provided with a front stop valve and a rear stop valve, and the front stop valve and the rear stop valve are respectively located upstream and downstream of the pneumatic regulating valve.

4. The lubricating oil temperature regulating and controlling device for an air separation unit according to any one of claims 1 to 3, characterized in that: The air separation unit includes an oil cooler, a lubricating oil tank, a steam turbine, a compressor and a filter; the water inlet and the water outlet of the oil cooler are respectively connected to the circulating water supply pipe and the circulating water outlet pipe; the oil inlet and the oil outlet of the oil cooler are respectively connected to the filter and the lubricating oil tank via the lubricating oil return pipeline and the lubricating oil external supply pipeline, the lubricating oil tank is connected to the oil inlet end of the steam turbine via the lubricating oil pump, and the oil inlet end and the oil outlet end of the steam turbine are both connected to the filter; the steam turbine is connected to the compressor.

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