Improved vacuum pump circulating water cooling system

Abstract

The utility model discloses an improved vacuum pump circulating water cooling system, and relates to the technical field of distillation recovery. The system comprises a water-ring vacuum pump, a water tank and a heat exchanger, a first inlet of the heat exchanger is connected with an outlet of the reflux pump, and a first outlet of the heat exchanger is connected with a liquid inlet of the water-ring vacuum pump; the second inlet is connected with a water outlet of the 7-DEG C chilled water pipeline, and the second outlet is connected with a water return port of the 7-DEG C chilled water pipeline; and water in the water tank flowing in from the first inlet exchanges heat with 7-DEG C chilled water flowing in from the second inlet through the heat exchange unit. According to the improved vacuum pump circulating water cooling system provided by the utility model, a set of heat exchange system is additionally arranged on a vacuum pump circulating water path, 7-DEG C chilled water is introduced, and the temperature of the vacuum pump circulating water is reduced through the 7-DEG C chilled water, so that the temperature of the vacuum pump circulating water is kept stable, and the efficient operation of the vacuum pump is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of distillation recovery, in particular to an improved vacuum pump circulating water cooling system. Background Art

[0002] In the DMAC distillation recovery process, the distillation tower needs to be in a vacuum negative pressure state. Therefore, a stable vacuum negative pressure system is the prerequisite for the stable operation of the entire distillation tower. At present, the vacuum negative pressure in the distillation tower is achieved by exhausting air with a water ring vacuum pump. The operating state of the water ring vacuum pump directly determines whether the distillation tower can operate stably.

[0003] The existing vacuum pump circulating water system mainly has the following problems: when the circulating water temperature of the vacuum pump is too high (especially when the temperature is high in summer), the operating efficiency of the vacuum pump decreases, the vacuum negative pressure value in the distillation tower cannot meet the process requirements, and the recovered DMAC product is of poor quality and cannot meet production requirements. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an improved vacuum pump circulating water cooling system, by adding a heat exchange system to the vacuum pump circulating water circuit, passing 7-degree chilled water, cooling the vacuum pump circulating water by the 7-degree chilled water, maintaining the vacuum pump circulating water temperature stable, and ensuring the efficient operation of the vacuum pump.

[0005] The utility model is achieved in this way:

[0006] An improved vacuum pump circulating water cooling system, comprising:

[0007] A water ring vacuum pump is connected to the final cooler at the top outlet of the distillation tower through a vacuum pipe, and is used to evacuate air so that the distillation tower is in a vacuum negative pressure state;

[0008] A water tank, the top of which is connected to the liquid outlet of the water ring vacuum pump, and the bottom of which is connected to the liquid inlet of the water ring vacuum pump through a reflux pump;

[0009] A heat exchanger, wherein the first inlet is connected to the outlet of the reflux pump through a first valve, and the first outlet is connected to the liquid inlet of the water ring vacuum pump through a first valve; the second inlet is connected to the water outlet of a 7°C chilled water pipeline, and the second outlet is connected to the water return port of the 7°C chilled water pipeline; the sink water flowing into the first inlet and the 7°C chilled water flowing into the second inlet are heat exchanged through a heat exchange unit; a second valve is provided in the working pipeline between the first inlet and the first outlet, and the two first valves and the second valve are used to control whether the liquid refluxed from the sink to the liquid inlet of the water ring vacuum pump passes through the heat exchanger.

[0010] Furthermore, the second inlet is connected to the water outlet of the 7°C chilled water pipeline through a third valve, and the second outlet is connected to the water return port of the 7°C chilled water pipeline through a third valve.

[0011] Furthermore, the inlet and outlet of the reflux pump are respectively provided with a fourth valve.

[0012] Furthermore, a fifth valve is provided at the connection end between the water ring vacuum pump and the vacuum pipe.

[0013] The advantages of the utility model are:

[0014] By adding a heat exchange system to the circulating water circuit of the vacuum pump and passing 7-degree chilled water, the circulating water of the vacuum pump can be cooled by the 7-degree chilled water to maintain a stable temperature of the circulating water of the vacuum pump and ensure efficient operation of the vacuum pump. When the ambient temperature is low and there is no need to use chilled water for cooling, the first valve can be closed and the second valve can be opened to allow the circulating water of the vacuum pump to not pass through the heat exchange system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the embodiments with reference to the accompanying drawings.

[0016] Figure 1 The present invention is a schematic structural diagram of an improved vacuum pump circulating water cooling system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings and specific implementation methods. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the utility model.

[0018] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0019] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] The invention concept of the utility model is as follows: in the existing spandex production, the high-temperature DMAC steam evaporated from the refining tower needs to be cooled by two coolers before it can be converted into low-temperature liquid DMAC for recovery. The first cooler uses 32°C cooling water, and the second cooler uses 7°C chilled water. The existing 7°C chilled water is introduced into the water ring vacuum pump, and heat exchange is achieved with the help of a heat exchanger, so that the temperature of the circulating water of the vacuum pump can be maintained stable, ensuring the efficient operation of the vacuum pump.

[0021] See also Figure 1 As shown, this embodiment provides an improved vacuum pump circulating water cooling system 100, comprising:

[0022] A water ring vacuum pump 1 is connected to the final cooler at the top outlet of the distillation tower through a vacuum pipe, and is used to evacuate air so that the distillation tower is in a vacuum negative pressure state;

[0023] A water tank 2, the top of which is connected to the liquid outlet of the water ring vacuum pump 1, and the bottom of which is connected to the liquid inlet of the water ring vacuum pump 1 through a reflux pump 3;

[0024] The heat exchanger 4 has a first inlet 41 connected to the outlet of the reflux pump 3 through a first valve 51, and a first outlet 42 connected to the liquid inlet of the water ring vacuum pump 1 through a first valve 51; a second inlet 43 is connected to the outlet of a 7°C chilled water pipeline, and a second outlet 44 is connected to the return water port of the 7°C chilled water pipeline; the sink water flowing into the first inlet 41 and the 7°C chilled water flowing into the second inlet 43 are heat exchanged through a heat exchange unit; a second valve 52 is provided in the working pipeline between the first inlet 14 and the first outlet 42, and the two first valves 51 and the second valve 52 are used to control whether the liquid refluxed from the sink 2 to the liquid inlet of the water ring vacuum pump 1 passes through the heat exchanger 4.

[0025] When the circulating water flowing back from the water tank 2 to the liquid inlet of the water ring vacuum pump 1 needs to pass through the heat exchanger 4, the two first valves 51 are opened and the second valve 52 is closed; when the circulating water flowing back from the water tank 2 to the liquid inlet of the water ring vacuum pump 1 does not need to pass through the heat exchanger 4, the two first valves 51 are closed and the second valve 52 is opened.

[0026] In one possible implementation, the second inlet 43 is connected to the outlet of the 7°C chilled water pipeline through a third valve 53, and the second outlet 44 is connected to the return port of the 7°C chilled water pipeline through a third valve 53. The third valve 53 is used to control the connection between the heat exchanger 4 and the 7°C chilled water pipeline.

[0027] In a possible implementation, the inlet and outlet of the reflux pump 3 are respectively provided with fourth valves 54. When the reflux pump 3 needs to be repaired or replaced and the water circuit needs to be disconnected, the two fourth valves 54 can be closed.

[0028] In a possible implementation, a fifth valve 55 is further provided at the connection end between the water ring vacuum pump 1 and the vacuum pipe.

[0029] The working principle of the utility model is as follows:

[0030] When the two first valves 51 are opened and the second valve 52 is closed, the circulating water from the water tank 2 back to the liquid inlet of the water ring vacuum pump 1 will enter the heat exchanger 4 through the first inlet 14, and exchange heat with the 7°C chilled water flowing in from the second inlet 43 through the heat exchange unit to achieve rapid cooling of the circulating water, and then back to the water ring vacuum pump 1 through the first outlet 42, so as to maintain the temperature of the water ring vacuum pump 1 stable and ensure the efficient operation of the vacuum pump. When the ambient temperature is low and there is no need to use chilled water for cooling, the first valve 51 can be closed and the second valve 52 can be opened so that the circulating water of the water ring vacuum pump 1 does not pass through the heat exchange system.

[0031] Although the specific implementation methods of the present invention are described above, those skilled in the art should understand that the specific embodiments described are only illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. An improved vacuum pump circulating water cooling system, characterized in that: include: A water ring vacuum pump is connected to the final cooler at the top outlet of the distillation tower through a vacuum pipe, and is used to evacuate air so that the distillation tower is in a vacuum negative pressure state; A water tank, the top of which is connected to the liquid outlet of the water ring vacuum pump, and the bottom of which is connected to the liquid inlet of the water ring vacuum pump through a reflux pump; A heat exchanger, wherein the first inlet is connected to the outlet of the reflux pump through a first valve, and the first outlet is connected to the liquid inlet of the water ring vacuum pump through a first valve; the second inlet is connected to the water outlet of a 7°C chilled water pipeline, and the second outlet is connected to the water return port of the 7°C chilled water pipeline; the sink water flowing into the first inlet and the 7°C chilled water flowing into the second inlet are heat exchanged through a heat exchange unit; a second valve is provided in the working pipeline between the first inlet and the first outlet, and the two first valves and the second valve are used to control whether the liquid refluxed from the sink to the liquid inlet of the water ring vacuum pump passes through the heat exchanger.

2. An improved vacuum pump circulating water cooling system according to claim 1, characterized in that: The second inlet is connected to the water outlet of the 7°C chilled water pipeline through a third valve, and the second outlet is connected to the water return port of the 7°C chilled water pipeline through a third valve.

3. An improved vacuum pump circulating water cooling system according to claim 1, characterized in that: The inlet and outlet of the reflux pump are respectively provided with a fourth valve.

4. An improved vacuum pump circulating water cooling system according to claim 1, characterized in that: The connecting end of the water ring vacuum pump and the vacuum pipe is also provided with a fifth valve.

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