Multi-stage rectification tower

Abstract

The utility model discloses a rectification multistage tower which comprises a tower body and a preheater, the tower body comprises a first-stage tower, a second-stage tower, a third-stage tower, a fourth-stage tower and a fifth-stage tower, the first-stage tower, the second-stage tower, the third-stage tower, the fourth-stage tower and the fifth-stage tower are respectively communicated with the preheater through pipelines, the first-stage tower is communicated with the second-stage tower through a pipeline, the second-stage tower is communicated with the third-stage tower through a pipeline, and the third-stage tower is communicated with the fifth-stage tower through a pipeline. The third-stage tower is communicated with the fourth-stage tower through a pipeline, the fourth-stage tower is communicated with the fifth-stage tower through a pipeline, a first-stage pump is arranged at the lower end of the first-stage tower, a second-stage pump is arranged at the lower end of the second-stage tower, a third-stage pump is arranged at the lower end of the third-stage tower, a fourth-stage pump is arranged at the lower end of the fourth-stage tower, and a fifth-stage pump is arranged at the lower end of the fifth-stage pump. The first-stage tower, the second-stage tower, the third-stage tower, the fourth-stage tower and the fifth-stage tower are all of square structures and are arranged side by side. The technical scheme is reasonable in structural design, compact in structure, low in height, high in heat and mass transfer efficiency, easy to maintain and good in practicability.

Description

TECHNICAL FIELD

[0001] The utility model relates to rectifying tower technical field, concretely relates to a rectifying multistage tower. BACKGROUND

[0002] The existing rectifying equipment generally adopts the traditional rectifying tower, through the retrieval, such as Chinese practical new type patent CN202421311861.7 discloses "a hydrogen cyanide rectifying equipment, including tower body, the tray structure in the tower body and the spray structure in the tower top, still including the liquid separation structure in the bottom of the tower body, the liquid separation structure includes the connecting ring platform fixed in the tower body inner wall and a plurality of first sub-boards fixed in the connecting ring platform, the bottom surface of first sub-board does not contact with the tower body bottom surface,", the rectifying tower body generally exceeds 20m, and the layout is scattered, and the building requirement is higher, in addition, the existing rectifying tower uses steam as heat source, and cooling circulating water as cold source, and the energy consumption cost is larger.

[0003] The traditional rectifying tower is high, and a little bit is inclined, and the liquid distribution of the whole tower body is greatly affected, and uneven distribution, wall flow and other phenomena are easily caused, so that the heat and mass exchange efficiency in the rectifying tower is poor.

[0004] The traditional rectifying tower needs to be heated for a long time before operation, and full reflux is needed, which wastes steam and time. UTILITY MODEL CONTENT

[0005] In view of the deficiencies of the prior art, the utility model aims at providing a rectifying multistage tower which has reasonable structure design, compact structure, low height, high heat and mass exchange efficiency, easy maintenance and good practicality.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a rectifying multistage tower, including tower body and preheater, the tower body includes primary tower, secondary tower, tertiary tower, quaternary tower and quinary tower, the primary tower, secondary tower, tertiary tower, quaternary tower and quinary tower are communicated with preheater through pipeline respectively, the primary tower is communicated with secondary tower through pipeline, secondary tower is communicated with tertiary tower through pipeline, tertiary tower is communicated with quaternary tower through pipeline, quaternary tower is communicated with quinary tower through pipeline, the lower end of primary tower is provided with primary pump, the lower end of secondary tower is provided with secondary pump, the lower end of tertiary tower is provided with tertiary pump, the lower end of quaternary tower is provided with quaternary pump, the lower end of quinary pump is provided with quinary pump, the primary tower, secondary tower, tertiary tower, quaternary tower and quinary tower are all square structure, and the primary tower, secondary tower, tertiary tower, quaternary tower and quinary tower are arranged side by side.

[0007] The utility model further sets up: one side of first stage tower is provided with reboiler, first stage tower and reboiler are communicated through pipeline, and reboiler bottom is provided with waste water discharge pump.

[0008] The utility model further sets up: the pipeline between first stage tower, second stage tower, third stage tower, fourth stage tower and five stage tower and preheater is provided with automatic valve respectively, after ascending temperature liquid phase material, according to different concentration by automatic valve control, make material enter one of first stage tower, second stage tower, third stage tower or fourth stage tower, first stage tower liquid and reboiler liquid combine after entering reboiler through first stage pump, produce ascending steam through tube and refrigerant heat exchange, second stage tower liquid enters first stage tower through second stage pump, and with ascending hot steam in first stage tower in the filler carries out heat mass exchange, third stage tower liquid enters second stage tower through third stage pump, and with ascending hot steam in second stage tower in the filler carries out heat mass exchange, fourth stage tower liquid enters third stage tower through fourth stage pump, and with ascending hot steam in third stage tower in the filler carries out heat mass exchange, five stage tower liquid enters fourth stage tower through fifth stage pump, and with ascending hot steam in fourth stage tower in the filler carries out heat mass exchange, five stage tower top material steam is introduced into preheater and raw material heat exchange.

[0009] The utility model further sets up: preheater one side is provided with main condenser, heat balance condenser, vacuum system, buffer tank, finished product cooler and qualified product storage tank, main condenser and preheater are communicated through pipeline, main condenser and heat balance condenser are communicated through pipeline, heat balance condenser and vacuum system are communicated through pipeline, heat balance condenser and buffer tank are communicated through pipeline, buffer tank and finished product cooler are communicated through pipeline, finished product cooler and qualified product storage tank are communicated through pipeline, main condenser and buffer tank are communicated through pipeline, buffer tank and five stage tower are communicated through pipeline, five stage tower and preheater are communicated through pipeline.

[0010] The utility model further sets up: through preheater, steam and a small part liquid phase material are introduced into main condenser through pipeline, main condenser leads to heat balance condenser through a small amount of steam ventilation pipeline, heat balance condenser is from the liquid phase material to buffer tank through pipeline, and the backflow of liquid in buffer tank is returned to finished product cooler through pipeline, and the qualified product of normal temperature liquid phase is introduced into qualified product storage tank through pipeline.

[0011] The utility model further sets up: first stage tower, second stage tower, third stage tower, fourth stage tower and five stage tower all are provided with distribution disc and filler, and the distribution disc sets at the top position of each stage tower, and the backflow liquid is evenly distributed after entering the distribution disc from the top of each stage tower and then enters the filler, and the liquid phase material falling after heat mass exchange in each stage tower is transported to the tower of previous stage by pump as backflow liquid redistribution, so that each stage tower forms different concentration components, and the concentration in the first stage tower is the lowest.

[0012] The utility model discloses the beneficial effect is: compared with prior art, the utility model discloses the rational structure design, the utility model discloses every tower section presents regular matrix, can be arranged side by side, the bottom of every tower section designs certain volume, transports to the top of next stage tower through the pump, and the top is provided with distribution disc, so that liquid can be evenly distributed to the filler. Through the change of this mode, not only can all the functions of the previous single-stage high tower be completely realized, but also various drawbacks in the design, manufacture and installation of the single-stage high tower are avoided. The structure is compact, the height is low, the heat mass exchange efficiency is high, the maintenance is easy and the practicality is good, and the specific embodiment is as follows:

[0013] (1) the total height of the utility model equipment is within 6m, can satisfy indoor installation without across floor, also can be installed in outdoor without steel frame or without relying on building, and the installation cost is greatly reduced, only needs cable laying and small -size steam pipeline and circulating water to provide, can greatly reduce the public system construction cost.

[0014] (2) the utility model can be made into pry dress structure, and the structure is compact and reasonable, and the space utilization rate is high, and the debugging operation is qualified before leaving factory. Compared with the traditional rectifying tower, the field installation time and the debugging time can be greatly shortened.

[0015] (3) every tower section of the utility model is independently positioned, can effectively guarantee the perpendicularity of every tower section, and every tower section has distribution disc, and liquid is collected and redistributed, and the efficiency of the filler is improved.

[0016] (4) every tower section of the utility model can be independently maintained, and does not need hoisting equipment.

[0017] (5) every tower section of the utility model has independent liquid storage function, when stopping, each tower section still maintains concentration difference, saves the energy cost of next period, simultaneously reduces the hot tower and full reflux time when starting.

[0018] (6) every tower section of the utility model is compact, reduces the heat dissipation area to outside, and reduces energy waste.

[0019] The utility model will be further described below in conjunction with the drawings and specific embodiments. DRAWINGS

[0020] Figure 1 It is the structure schematic of the utility model embodiment Figure 1 ;

[0021] Figure 2 It is the structure schematic of the utility model embodiment Figure 2 ;

[0022] Figure 3 It is the main view schematic of the utility model embodiment;

[0023] Figure 4 It is a top view schematic diagram of the embodiment of the utility model;

[0024] Figure 5 It is a principle schematic diagram of the embodiment of the utility model. Specific implementation

[0025] In the description of the embodiment, it needs to be explained that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "back" and the like appear, the indicated orientation or position relationship is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore, it cannot be understood as a limitation on the utility model. In addition, if the terms "first", "second", "third" appear, they are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0026] Referring to Figures 1 to 5 The utility model discloses a rectification multistage tower, including tower body and preheater 8, the tower body includes one stage tower 13, two stage tower 14, three stage tower 15, four stage tower 16 and five stage tower 17, one stage tower 13, two stage tower 14, three stage tower 15, four stage tower 16 and five stage tower 17 are communicated with preheater 8 respectively through pipeline, one stage tower 13 is communicated with two stage tower 15 through pipeline, two stage tower 14 is communicated with three stage tower 15 through pipeline, three stage tower 15 is communicated with four stage tower 16 through pipeline, four stage tower 16 is communicated with five stage tower 17 through pipeline, one stage tower 13 lower end is provided with one stage pump 131, two stage tower 14 lower end is provided with two stage pump 141, three stage tower 15 lower end is provided with three stage pump 151, four stage tower 16 lower end is provided with four stage pump 161, five stage pump 17 lower end is provided with five stage pump 171, one stage tower 13, two stage tower 14, three stage tower 15, four stage tower 16 and five stage tower 17 all are square structure, and one stage tower 13, two stage tower 14, three stage tower 15, four stage tower 16 and five stage tower 17 are arranged side by side.

[0027] As preferred, one stage tower 13, two stage tower 14, three stage tower 15, four stage tower 16 and five stage tower 17 are assembled into an integral body side by side, and one stage pump 131, two stage pump 141, three stage pump 151, four stage pump 161 and five stage pump 171 are all water pumps. The vacuum system 11 includes a vacuum pump and a water tank.

[0028] One stage tower 13, two stage tower 14, three stage tower 15, four stage tower 16 and five stage tower 17 are all provided with independent liquid storage structures, and due to the independent liquid storage function, the concentration difference of each tower section is still maintained when stopping, the energy consumption cost of the next period is saved, and the hot tower and full reflux time when starting are reduced.

[0029] In order to make the structure design of the utility model more reasonable, as preferred, the first-stage tower 13 is provided with a reboiler 5 on one side, and the first-stage tower 13 and the reboiler 5 are communicated through a pipeline, and the reboiler 5 is provided with a waste water discharge pump at the bottom.

[0030] The pipeline between the first-stage tower 13, the second-stage tower 14, the third-stage tower 15, the fourth-stage tower 16, the fifth-stage tower 17 and the preheater 8 is respectively provided with an automatic valve, and after the temperature of the liquid phase material is raised, the material is controlled by the automatic valve according to different concentrations and enters one of the first-stage tower 13, the second-stage tower 14, the third-stage tower 15 or the fourth-stage tower 16, the liquid in the first-stage tower 13 and the liquid in the reboiler 5 are combined and enter the reboiler 5 through a first-stage pump 131, heat exchange is carried out between the tubes and the refrigerant, and rising steam is generated; the liquid in the second-stage tower 14 enters the first-stage tower 13 through a second-stage pump 141, and heat and mass exchange is carried out in the filler between the rising hot steam in the first-stage tower 13; the liquid in the third-stage tower 15 enters the second-stage tower 14 through a third-stage pump 151, and heat and mass exchange is carried out in the filler between the rising hot steam in the second-stage tower 14; the liquid in the fourth-stage tower 16 enters the third-stage tower 15 through a fourth-stage pump 161, and heat and mass exchange is carried out in the filler between the rising hot steam in the third-stage tower 15; the liquid in the fifth-stage tower 17 enters the fourth-stage tower 16 through a fifth-stage pump 171, and heat and mass exchange is carried out in the filler between the rising hot steam in the fourth-stage tower 16; the material steam at the top of the fifth-stage tower 17 is introduced into the preheater 8 and the raw material for heat exchange.

[0031] The preheater 8 is provided with a main condenser 1, a heat balance condenser 9, a vacuum system 11, a buffer tank 10, a finished product cooler 12 and a qualified product storage tank on one side, the main condenser 1 and the preheater 8 are communicated through a pipeline, the main condenser 1 and the heat balance condenser 9 are communicated through a pipeline, the heat balance condenser 9 and the vacuum system 11 are communicated through a pipeline, the heat balance condenser 9 and the buffer tank 10 are communicated through a pipeline, the buffer tank 10 and the finished product cooler 12 are communicated through a pipeline, and the finished product cooler 12 and the qualified product storage tank are communicated through a pipeline; the main condenser 1 and the buffer tank 10 are communicated through a pipeline, the buffer tank 10 and the fifth-stage tower 17 are communicated through a pipeline, and the fifth-stage tower 17 and the preheater 8 are communicated through a pipeline. The steam and a small part of the liquid phase material are introduced into the main condenser 1 through a pipeline by the preheater 8, the main condenser 1 introduces a small amount of steam into the heat balance condenser 9 through a pipeline, the heat balance condenser 9 causes the liquid phase material to flow to the buffer tank 10 through a pipeline, the liquid in the buffer tank 10 flows back to the finished product cooler 12 through a pipeline, and the normal temperature liquid phase qualified product is introduced into the qualified product storage tank through a pipeline.

[0032] The primary tower 13, the secondary tower 14, the tertiary tower 15, the quaternary tower 16 and the quinary tower 17 are all provided with a distribution tray and a filler, the distribution tray is arranged at the top of each tower, and the reflux liquid is uniformly distributed in the filler after entering the distribution tray from the top of each tower, the liquid phase material falling after heat and mass exchange at the bottom of each tower is transported to the tower of the previous stage by a pump to be redistributed as reflux liquid, so that each tower forms components with different concentrations, and the concentration in the first stage tower is the lowest.

[0033] The two ends of each pipeline are respectively connected and fixed by flanges or fixed by welding or fixed by threaded connection.

[0034] The utility model discloses a regular matrix is presented to each tower section, can be arranged side by side, a certain volume is designed at the bottom of each tower section, transports to the top of the next stage tower through a pump, and the top is provided with a distribution tray, so that the liquid can be uniformly distributed into the filler. Through the change of this mode, not only all the functions of the previous single high tower can be completely realized, but also various drawbacks in the design, manufacture and installation of the single high tower are avoided. The structure design is reasonable, compact, low in height, high in heat and mass exchange efficiency, easy to maintain and good in practicality.

[0035] The beneficial effects are as follows:

[0036] (1) The total height of the equipment is within 6m, which can meet the indoor installation without crossing floors, and can be installed outdoors without steel frame or relying on buildings, so that the installation cost is greatly reduced, only cable laying, small steam pipeline and circulating water are needed to provide, and the public system construction cost can be greatly reduced.

[0037] (2) The utility model can be made into a pry structure, which is compact and reasonable in structure, high in space utilization rate, and qualified in debugging and operation before leaving the factory. Compared with the traditional rectifying tower, the on-site installation time and debugging time can be greatly shortened.

[0038] (3) Each tower section is independently positioned, so that the perpendicularity of each tower section can be effectively guaranteed, each tower section has a distribution tray, liquid is collected and redistributed, and the efficiency of the filler is improved.

[0039] (4) Each tower section can be independently maintained without the need of hoisting equipment.

[0040] (5) Each tower section has an independent liquid storage function, when shutdown, each tower section still maintains a concentration difference, saves the energy cost of the next cycle, and reduces the hot tower and full reflux time when starting.

[0041] (6) Each tower section is compact, reduces the heat dissipation area to the outside, and reduces energy waste.

[0042] In addition, the technical scheme of the embodiment can be improved, for example, the structures of the first column 13, the second column 14, the third column 15, the fourth column 16 and the fifth column 17 are all set to be cylindrical. The above embodiments are used for further illustrating the utility model, and cannot be understood as limiting the protection scope of the utility model. The skilled in the art can make some non-essential improvements and adjustments to the utility model according to the content of the utility model, and the improvements and adjustments fall within the protection scope of the utility model.

Claims

1. A multi-stage distillation column, comprising a column body and a preheater (8), characterized in that: The tower body includes a primary tower (13), a secondary tower (14), a tertiary tower (15), a quaternary tower (16), and a quinary tower (17). The primary tower (13), secondary tower (14), tertiary tower (15), quaternary tower (16), and quinary tower (17) are connected to the preheater (8) via pipes. The primary tower (13) is connected to the secondary tower (14) via a pipe, the secondary tower (14) is connected to the tertiary tower (15) via a pipe, the tertiary tower (15) is connected to the quaternary tower (16) via a pipe, and the quaternary tower (16) is connected to the quinary tower (17) via a pipe. The primary tower (13) is connected to the quaternary tower (14) via a pipe, the tertiary tower (15) is connected to the quaternary tower (16), and the quaternary tower (16) is connected to the quinary tower (17). 3) A primary pump (131) is installed at the lower end of the secondary tower (14), a secondary pump (141) is installed at the lower end of the secondary tower (14), a tertiary pump (151) is installed at the lower end of the tertiary tower (15), a quaternary pump (161) is installed at the lower end of the quaternary tower (16), and a quintuplet pump (171) is installed at the lower end of the quintuplet tower (17). The primary tower (13), secondary tower (14), tertiary tower (15), quaternary tower (16), and quintuplet tower (17) are all square structures, and the primary tower (13), secondary tower (14), tertiary tower (15), quaternary tower (16), and quintuplet tower (17) are arranged side by side.

2. A multi-stage distillation column according to claim 1, characterized in that: A reboiler (5) is provided on one side of the primary tower (13). The primary tower (13) and the reboiler (5) are connected by a pipeline. A wastewater discharge pump is provided at the bottom of the reboiler (5).

3. A multi-stage distillation column according to claim 2, characterized in that: Automatic valves are installed on the pipelines between the first-stage tower (13), second-stage tower (14), third-stage tower (15), fourth-stage tower (16), and fifth-stage tower (17) and the preheater (8). After the liquid material is heated, the automatic valves control the flow of the material into one of the first-stage tower (13), second-stage tower (14), third-stage tower (15), or fourth-stage tower (16) according to the different concentrations. The liquid in the first-stage tower (13) and the liquid in the reboiler (5) are combined and then enter the reboiler (5) through the first-stage pump (131). Through heat exchange with the refrigerant in the tubes, rising steam is generated. The liquid in the second-stage tower (14) enters the first-stage tower (13) through the second-stage pump (141) and merges with the liquid in the first-stage tower. The rising hot steam in (13) undergoes heat and mass exchange within the packing; the liquid in the third-stage tower (15) enters the second-stage tower (14) through the third-stage pump (151) and undergoes heat and mass exchange with the rising hot steam in the second-stage tower (14) within the packing; the liquid in the fourth-stage tower (16) enters the third-stage tower (15) through the fourth-stage pump (161) and undergoes heat and mass exchange with the rising hot steam in the third-stage tower (15) within the packing; the liquid in the fifth-stage tower (17) enters the fourth-stage tower (16) through the fifth-stage pump (171) and undergoes heat and mass exchange with the rising hot steam in the fourth-stage tower (16) within the packing; the steam from the top of the fifth-stage tower (17) is introduced into the preheater (8) for heat exchange with the raw material.

4. A multi-stage distillation column according to claim 3, characterized in that: The preheater (8) is equipped with a main condenser (1), a heat balance condenser (9), a vacuum system (11), a buffer tank (10), a finished product cooler (12), and a qualified product storage tank on one side. The main condenser (1) is connected to the preheater (8) through a pipeline. The main condenser (1) is connected to the heat balance condenser (9) through a pipeline. The heat balance condenser (9) is connected to the vacuum system (11) through a pipeline. The heat balance condenser (9) is connected to the buffer tank (10) through a pipeline. The buffer tank (10) is connected to the finished product cooler (12) through a pipeline. The finished product cooler (12) is connected to the qualified product storage tank through a pipeline. The main condenser (1) is connected to the buffer tank (10) through a pipeline. The buffer tank (10) is connected to the five-stage tower (17) through a pipeline. The five-stage tower (17) is connected to the preheater (8) through a pipeline.

5. A multi-stage distillation column according to claim 4, characterized in that: Steam and a small amount of liquid material are introduced into the main condenser (1) through the preheater (8) via a pipeline. The main condenser (1) introduces a small amount of steam into the heat balance condenser (9) through a ventilation pipeline. The heat balance condenser (9) allows the liquid material to flow by gravity into the buffer tank (10) through a pipeline. The liquid in the buffer tank (10) flows back to the finished product cooler (12) through a pipeline. The qualified liquid product at room temperature is introduced into the qualified product storage tank through a pipeline.

6. A multi-stage distillation column according to claim 5, characterized in that: Each of the first-stage tower (13), second-stage tower (14), third-stage tower (15), fourth-stage tower (16), and fifth-stage tower (17) is equipped with a distribution plate and packing. The distribution plate is located at the top of each stage of the tower. The reflux liquid enters the distribution plate from the top of each stage of the tower and is evenly distributed before entering the packing. The liquid phase material that falls after heat and mass exchange at the bottom of each stage of the tower is pumped to the previous stage of the tower as reflux liquid for redistribution, so that each stage of the tower forms components of different concentrations, with the lowest concentration in the first stage of the tower.

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