Tower top temperature adjusting system of distillation tower

Abstract

The tower top temperature adjusting system comprises the distillation tower, a condenser, a cooling water pump and a cooling tower, a water outlet of the cooling water pump is communicated with a water inlet of a tube pass of the condenser through a water inlet pipe, and a front electric adjusting valve, a manual adjusting valve and a rear electric adjusting valve are sequentially arranged on the water inlet pipe. The front electric adjusting valve and the rear electric adjusting valve can remotely control the opening degree, the flow of cooling water can be more accurately and flexibly adjusted, and then the temperature of the condenser and the tower top can be more accurately and flexibly adjusted; the matching combination of the front and rear electric regulating valves and the middle manual regulating valve ensures the normal and stable regulation and safety of the tower top temperature; the water inlet of the front electric control valve is communicated with the water outlet of the rear electric control valve through the bypass pipeline, and the bypass pipeline is provided with the electric bypass valve, so that when the water inlet pipe is accidentally cut off, cooling water always exists in the condenser, and the normal and stable adjustment and safety of the temperature of the condenser and the tower top are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of a distillation tower top temperature regulating system, in particular to a distillation tower top temperature regulating system. Background Art

[0002] The distillation tower system consists of a distillation tower, a reboiler, a condenser, a reflux tank and other equipment. Distillation is usually carried out in a distillation tower, and the gas and liquid phases are in countercurrent contact to carry out interphase heat and mass transfer. The volatile components in the liquid phase enter the gas phase, and the non-volatile components in the gas phase are transferred to the liquid phase, so that almost pure volatile components can be obtained at the top of the tower, and almost pure non-volatile components can be obtained at the bottom of the tower. The vapor drawn from the top of the distillation tower is condensed by the condenser, and a part of the condensate produced by the condenser is returned to the top of the distillation tower as reflux liquid, and the remaining condensate in the condenser is the top product. The ratio of the amount of liquid refluxed into the tower from the top of the tower to the amount of the top product is called the reflux ratio, and its size will affect the separation effect and energy consumption of the distillation operation.

[0003] The top temperature of the distillation tower needs to be regulated. The existing valve group has low accuracy, flexibility and safety, which wastes manpower and makes it easy for products to be unqualified.

[0004] Therefore, how to improve the accuracy, flexibility and safety of regulating the top temperature of a distillation tower is a technical problem that those skilled in the art urgently need to solve. Utility Model Content

[0005] The utility model aims to provide a tower top temperature regulating system for a distillation tower.

[0006] In order to solve the above technical problems, the technical solution provided by the utility model is:

[0007] A tower top temperature control system for a distillation tower comprises a distillation tower, a condenser and a circulating cooling water system, wherein the circulating cooling water system comprises a cooling water pump and a cooling tower, the condenser is a partition wall heat exchanger structure, the condenser comprises a tube side for circulating cooling water and a shell side for circulating steam, a water inlet and a water outlet connected to the tube side are arranged on the outer shell wall of the condenser, and an air inlet and an air outlet connected to the shell side are arranged on the outer shell wall of the condenser;

[0008] The top gas outlet of the distillation tower is connected to the air inlet of the shell side of the condenser, and the shell side liquid outlet of the condenser is connected to the reflux liquid inlet of the top of the distillation tower through the reflux liquid pipeline;

[0009] The water outlet of the cooling water pump is connected to the water inlet of the tube side of the condenser through the water inlet pipe, the water outlet of the tube side of the condenser is connected to the water inlet of the cooling tower through the water outlet pipe, and the water inlet of the cooling water pump is connected to the water outlet of the cooling tower through the pipeline;

[0010] A front electric regulating valve, a manual regulating valve and a rear electric regulating valve are arranged in sequence on the water inlet pipe in the direction from the cooling water pump to the condenser;

[0011] The water inlet of the front electric regulating valve is communicated with the water outlet of the rear electric regulating valve through a bypass pipeline, and an electric bypass valve is arranged on the bypass pipeline.

[0012] Preferably, the water outlet of the tube side of the condenser is connected to the water inlet of the front electric regulating valve through a return water pipe, and a return water regulating valve is provided on the return water pipe, and the return water regulating valve is an electric ball valve or an electric stop valve.

[0013] Preferably, it also includes a reflux liquid heat exchanger, the water inlet of the tube side of the reflux liquid heat exchanger is connected to the water outlet of the rear electric regulating valve through a pipeline, and the water outlet of the tube side of the reflux liquid heat exchanger is connected to the water inlet of the cooling tower through a pipeline;

[0014] The liquid inlet of the shell side of the reflux liquid heat exchanger is connected to the liquid outlet of the shell side of the condenser, and the liquid outlet of the shell side of the reflux liquid heat exchanger is connected to the reflux liquid inlet at the top of the distillation tower through the reflux liquid pipeline;

[0015] A reflux liquid cooling water regulating valve is arranged on a pipeline connecting the water inlet of the tube side of the reflux liquid heat exchanger and the water outlet of the rear electric regulating valve. The reflux liquid cooling water regulating valve is an electric ball valve or an electric stop valve.

[0016] Preferably, the front electric regulating valve, the rear electric regulating valve and the electric bypass valve are all electric ball valves or electric stop valves;

[0017] The manual regulating valve is a manual ball valve or a manual stop valve.

[0018] Preferably, the reflux liquid heat exchanger is a shell and tube heat exchanger.

[0019] The present application has achieved the following beneficial technical effects:

[0020] In the present application, a front electric regulating valve, a manual regulating valve, and a rear electric regulating valve are sequentially arranged on the water inlet pipe in the direction from the cooling water pump to the condenser. The front electric regulating valve and the rear electric regulating valve can remotely control the opening of the valve, thereby more accurately and flexibly regulating the flow of cooling water, thereby more accurately and flexibly regulating the temperature in the condenser. Since the condenser is connected to the top of the distillation tower, the top temperature of the distillation tower can be more accurately and flexibly adjusted.

[0021] The combination of the two electric regulating valves in front and behind and the manual regulating valve in the middle ensures that the cooling water in the mainstream water inlet pipe will not be interrupted, ensuring that there is always cooling water flowing through the condenser, ensuring the safety and normal operation of the condenser, and thus ensuring the normal and stable regulation of the top temperature of the distillation tower and improving safety;

[0022] A bypass pipe and an electric bypass valve thereon are provided. In case of an unexpected interruption of flow in the mainstream water inlet pipe, the bypass pipe and the electric bypass valve thereon can be opened urgently to ensure that cooling water always flows through the condenser, thereby ensuring the safety and normal operation of the condenser, and further ensuring the normal and stable regulation of the top temperature of the distillation tower and improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the working principle of a top temperature control system of a distillation tower provided in an embodiment of the utility model;

[0024] Figure 2 A schematic diagram of the working principle of a top temperature control system of a distillation tower provided in another embodiment of the utility model;

[0025] Figure 3 A schematic diagram of the working principle of a top temperature control system of a distillation tower provided in yet another embodiment of the utility model;

[0026] In the figure: 1 distillation tower, 2 condenser, 201 reflux liquid pipeline;

[0027] 301 cooling water pump, 302 cooling tower, 303 front electric regulating valve, 304 manual regulating valve, 305 rear electric regulating valve, 306 electric bypass valve;

[0028] 401 return water pipeline, 402 return water regulating valve;

[0029] 501 reflux liquid heat exchanger, 502 reflux liquid cooling water regulating valve. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] In the description of the present invention, it should be understood that the terms "center", "axial", "radial", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like 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, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0032] Reference Figure 1-3 In the figure: distillation tower 1, condenser 2, reflux liquid pipeline 201; cooling water pump 301, cooling tower 302, front electric regulating valve 303, manual regulating valve 304, rear electric regulating valve 305, electric bypass valve 306; return water pipeline 401, return water regulating valve 402; reflux liquid heat exchanger 501, reflux liquid cooling water regulating valve 502.

[0033] like Figure 1 As shown, the present application provides a tower top temperature control system for a distillation tower, comprising a distillation tower 1, a condenser 2 and a circulating cooling water system, wherein the circulating cooling water system comprises a cooling water pump 301 and a cooling tower 302, and the condenser 2 is a partition wall heat exchanger structure, wherein the condenser 2 comprises a tube side for circulating cooling water and a shell side for circulating steam, and a water inlet and a water outlet connected to the tube side are arranged on the outer shell wall of the condenser 2, and an air inlet and an air outlet connected to the shell side are arranged on the outer shell wall of the condenser 2;

[0034] The gas outlet at the top of the distillation tower 1 is connected to the gas inlet of the shell side of the condenser 2, and the liquid outlet at the shell side of the condenser 2 is connected to the reflux liquid inlet at the top of the distillation tower 1 through the reflux liquid pipeline 201;

[0035] The water outlet of the cooling water pump 301 is connected to the water inlet of the tube side of the condenser 2 through the water inlet pipe, the water outlet of the tube side of the condenser 2 is connected to the water inlet of the cooling tower 302 through the water outlet pipe, and the water inlet of the cooling water pump 301 is connected to the water outlet of the cooling tower 302 through a pipeline;

[0036] A front electric regulating valve 303, a manual regulating valve 304, and a rear electric regulating valve 305 are sequentially arranged on the water inlet pipe in the direction from the cooling water pump 301 to the condenser 2;

[0037] The water inlet of the front electric regulating valve 303 is connected to the water outlet of the rear electric regulating valve 305 through a bypass pipe, and an electric bypass valve 306 is provided on the bypass pipe.

[0038] Although the cooling water is used for condensation in the condenser 2, the lower the temperature of the cooling water is, the better. Since the inlet water temperature of the cooling water in winter is significantly lower than that in summer, such a large inlet water temperature fluctuation will cause other corresponding process parameters to be greatly changed to adapt to the seasonal water temperature fluctuation. The process parameters are changed back and forth several times throughout the year, which is likely to cause large fluctuations and disorder in the system, which is not conducive to the stable and smooth production of the condenser 2 and the distillation tower 1 throughout the year.

[0039] To this end, in one embodiment of the present application, Figure 2 As shown, the water outlet of the tube side of the condenser 2 is connected to the water inlet of the front electric regulating valve 303 through the return water pipe 401, and a return water regulating valve 402 is provided on the return water pipe 401, and the return water regulating valve 402 is an electric ball valve or an electric stop valve;

[0040] Since the outlet water of the tube side of condenser 2 is hot water after heat exchange and temperature increase, the outlet hot water is returned to the inlet cold water for mixing with the hot water. The return water regulating valve 402 controls the flow rate of the outlet hot water to achieve more or less mixing, thereby fully and reasonably recycling the waste heat in the waste water, thereby significantly improving the temperature of the inlet cold water, making it close to or reaching the target required inlet temperature throughout the year, thereby achieving a relatively stable inlet temperature of cooling water throughout the year regardless of seasonal changes, with small fluctuations, thereby ensuring the stable and smooth control of the top temperature of the condenser 2 and the distillation tower 1 throughout the year.

[0041] The condenser 2 is mainly used to condense the high-temperature gas evaporated from the distillation tower 1, and condense part of the high-temperature gas into liquid. Since the condensation capacity of the condenser 2 is limited, more of the condensation capacity is used to condense the high-temperature gas, resulting in insufficient cooling capacity for the condensate, which in turn causes the temperature of the reflux liquid at the top of the reflux distillation tower 1 to be often too high, thereby affecting the stable and smooth control of the top temperature of the distillation tower 1 throughout the year;

[0042] To this end, in one embodiment of the present application, Figure 3 As shown, the tower top temperature control system also includes a reflux liquid heat exchanger 501, the water inlet of the tube side of the reflux liquid heat exchanger 501 is connected to the water outlet of the rear electric regulating valve 305 through a pipeline, and the water outlet of the tube side of the reflux liquid heat exchanger 501 is connected to the water inlet of the cooling tower 302 through a pipeline;

[0043] The liquid inlet of the shell side of the reflux liquid heat exchanger 501 is connected to the liquid outlet of the shell side of the condenser 2, and the liquid outlet of the shell side of the reflux liquid heat exchanger 501 is connected to the reflux liquid inlet at the top of the distillation tower 1 through the reflux liquid pipeline 201;

[0044] A reflux liquid cooling water regulating valve 502 is provided on the pipeline connecting the water inlet of the pipe side of the reflux liquid heat exchanger 501 and the water outlet of the rear electric regulating valve 305. The reflux liquid cooling water regulating valve 502 is an electric ball valve or an electric stop valve.

[0045] Here, a reflux liquid heat exchanger 501 is added downstream of the condenser 2. When the temperature of the reflux liquid is higher than the design value, the cooling water in the reflux liquid heat exchanger 501 is used to perform secondary cooling on the reflux liquid, so as to reduce the temperature of the reflux liquid to the design value, and then the reflux liquid is refluxed to the top of the distillation tower 1. This solves the problem of high reflux liquid temperature in the traditional way, so that the temperature of the reflux liquid is as close to the design value as possible and as stable as possible, which is more conducive to achieving stable and smooth control of the top temperature of the distillation tower 1 throughout the year.

[0046] In one embodiment of the present application, the front electric regulating valve 303 , the rear electric regulating valve 305 , and the electric bypass valve 306 are all electric ball valves or electric stop valves;

[0047] The manual regulating valve 304 is a manual ball valve or a manual stop valve.

[0048] In one embodiment of the present application, the reflux liquid heat exchanger 501 is a shell and tube heat exchanger.

[0049] The methods and devices not described in detail in the present invention are all prior art and will not be described in detail.

[0050] The principles and implementation methods of the present invention are described in this article using specific embodiments. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A tower top temperature control system for a distillation tower, comprising a distillation tower, a condenser and a circulating cooling water system, wherein the circulating cooling water system comprises a cooling water pump and a cooling tower, characterized in that: The condenser is a partition-type heat exchanger structure, which includes a tube side for circulating cooling water and a shell side for circulating steam. The outer shell wall of the condenser is provided with a water inlet and a water outlet connected to the tube side, and the outer shell wall of the condenser is provided with an air inlet and an air outlet connected to the shell side. The top gas outlet of the distillation tower is connected to the air inlet of the shell side of the condenser, and the shell side liquid outlet of the condenser is connected to the reflux liquid inlet of the top of the distillation tower through the reflux liquid pipeline; The water outlet of the cooling water pump is connected to the water inlet of the tube side of the condenser through the water inlet pipe, the water outlet of the tube side of the condenser is connected to the water inlet of the cooling tower through the water outlet pipe, and the water inlet of the cooling water pump is connected to the water outlet of the cooling tower through the pipeline; A front electric regulating valve, a manual regulating valve and a rear electric regulating valve are arranged in sequence on the water inlet pipe in the direction from the cooling water pump to the condenser; The water inlet of the front electric regulating valve is communicated with the water outlet of the rear electric regulating valve through a bypass pipeline, and an electric bypass valve is arranged on the bypass pipeline.

2. The top temperature control system of a distillation tower according to claim 1, characterized in that: The water outlet of the tube side of the condenser is connected with the water inlet of the front electric regulating valve through the return water pipe. The return water pipe is provided with a return water regulating valve, which is an electric ball valve or an electric stop valve.

3. The top temperature control system of a distillation tower according to claim 1, characterized in that: It also includes a reflux liquid heat exchanger, the water inlet of the tube side of the reflux liquid heat exchanger is connected to the water outlet of the rear electric regulating valve through a pipeline, and the water outlet of the tube side of the reflux liquid heat exchanger is connected to the water inlet of the cooling tower through a pipeline; The liquid inlet of the shell side of the reflux liquid heat exchanger is connected to the liquid outlet of the shell side of the condenser, and the liquid outlet of the shell side of the reflux liquid heat exchanger is connected to the reflux liquid inlet at the top of the distillation tower through the reflux liquid pipeline; A reflux liquid cooling water regulating valve is arranged on a pipeline connecting the water inlet of the tube side of the reflux liquid heat exchanger and the water outlet of the rear electric regulating valve. The reflux liquid cooling water regulating valve is an electric ball valve or an electric stop valve.

4. The top temperature control system of a distillation tower according to claim 1, characterized in that: The front electric regulating valve, the rear electric regulating valve and the electric bypass valve are all electric ball valves or electric stop valves; The manual regulating valve is a manual ball valve or a manual stop valve.

5. The top temperature control system of a distillation tower according to claim 3, characterized in that: The reflux heat exchanger is a shell and tube heat exchanger.

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