Safe energy-saving type chemical rectifying tower

Abstract

The application discloses a safe and energy-saving type chemical rectifying tower, which comprises a rectifying tower body, a condenser arranged at the top of the rectifying tower body, a filler layer arranged in the middle of the rectifying tower body and a heater arranged at the bottom of the rectifying tower body; wherein the heat exchanger is a shell structure, a surrounding pipe respectively communicating with the liquid outlet pipe and the liquid inlet pipe is arranged in the heat exchanger, heat exchange working medium is conveyed in the shell structure, and the heated heat exchange working medium is supplemented into the bottom of the rectifying tower body or introduced into a branch water tank for comprehensive utilization. In the application, a plurality of flow sensors and temperature sensors are respectively arranged on the heat exchange pipes at the inlet and outlet ends of the condenser, leakage and filler layer blockage can be detected in time by comparison and setting detection of the controller, and the heat of the cooling oil is partially recovered by the heat exchanger, so that comprehensive utilization of energy is facilitated.

Description

Technical Field

[0001] This invention relates to the field of chemical technology, and in particular to a safe and energy-saving chemical distillation column. Background Technology

[0002] Dimethyl carbonate is an organic compound with the chemical formula C3H6O3. It is a low-toxicity, environmentally friendly, and widely used chemical raw material. It is an important organic synthesis intermediate. Its molecular structure contains functional groups such as carbonyl, methyl, and methoxy groups, giving it a variety of reactivity properties. In production, it is safe, convenient, produces little pollution, and is easy to transport.

[0003] When crude dimethyl carbonate is purified by distillation, if there are many impurities, it may cause blockage of the packing layer. If it is not adjusted in time, it may cause the heater and heat exchange pipes to overheat and cause an explosion. In addition, there is also a risk of leakage in the pipes. Conventional distillation equipment lacks equipment for timely monitoring and control. Summary of the Invention

[0004] The purpose of this invention is to provide a safe and energy-saving chemical distillation column, which solves the technical problems mentioned in the background art that are easily encountered during the distillation and purification of conventional dimethyl carbonate.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] The present invention provides a safe and energy-saving chemical distillation column, comprising a distillation column body, a condenser disposed at the top of the distillation column body, a packing layer disposed in the middle of the distillation column body, and a heater disposed at the bottom of the distillation column body;

[0007] The condenser is connected to the interior of the heat exchanger through an inlet pipe and an outlet pipe, wherein a temperature control mechanism, a first temperature sensor, and a first flow sensor are provided on the inlet pipe;

[0008] A second flow sensor, a second temperature sensor, a solenoid valve, and a delivery pump are installed on the liquid outlet pipe;

[0009] The heat exchanger is a shell structure, in which a surrounding pipe is arranged to connect the liquid outlet pipe and the liquid inlet pipe respectively, and a heat exchange medium is transported within the shell structure. The heated portion of the heat exchange medium is then added to the plant's main steam pipe for comprehensive utilization.

[0010] In a further optimization, the first flow sensor and the second flow sensor are respectively connected to the flow controller as signal input terminals, wherein the flow controller regulates the opening and closing of the solenoid valve according to the difference between the first flow sensor and the second flow sensor.

[0011] In a further optimization, the first temperature sensor and the second temperature sensor are respectively connected to the temperature controller as signal input terminals, wherein the temperature controller regulates the opening and closing of the temperature adjustment mechanism and the solenoid valve according to the difference between the first temperature sensor and the second temperature sensor.

[0012] Further optimization involves using an electric heater or a steam heater as the temperature control mechanism.

[0013] In a further optimization, the heat exchange medium in the heat exchanger is water, which is transported to the heater through pipelines and a transfer pump.

[0014] In a further optimization, the flow direction of the heat exchange oil in the pipes within the heat exchanger is opposite to the flow direction of the water.

[0015] Further optimization involves heating the water pipes and then delivering it to the hot water tank via branch pipes.

[0016] Compared with the prior art, the beneficial technical effects of the present invention are as follows: In this application, multiple flow sensors and temperature sensors are installed on the heat exchange pipes located at the inlet and outlet of the condenser, and the leakage and packing layer blockage problems are detected in a timely manner by comparing the detection settings according to the controller. In addition, in this application, the heat exchanger is used to partially recover the heat of the cooling oil, which facilitates the comprehensive utilization of energy. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the main structure of the safe and energy-saving chemical distillation tower described in this invention;

[0019] Figure 2 This is a schematic diagram of temperature control in the safe and energy-saving chemical distillation column described in this invention;

[0020] Figure 3 This is a schematic diagram of the flow rate regulation of the safe and energy-saving chemical distillation tower described in this invention.

[0021] Explanation of reference numerals in the attached drawings: 1. Distillation column body; 2. Condenser; 2a. First flow sensor; 2b. Second flow sensor; 3. Packing layer; 4. Heater; 5. Temperature control mechanism; 6. Heat exchanger; 7. Transfer pump; 7a. Liquid outlet pipe; 7b. Liquid inlet pipe; 8. Solenoid valve; 9. First temperature sensor; 9a. Second temperature sensor. Detailed Implementation

[0022] like Figure 1-3As shown, this embodiment discloses a safe and energy-saving chemical distillation column, including a distillation column body 1, a condenser 2 installed at the top of the distillation column body 1, a packing layer 3 installed in the middle of the distillation column body 1, and a heater 4 installed at the bottom of the distillation column body 1;

[0023] The crude dimethyl carbonate product is fed into the lower part of the distillation column 1 via a pipeline. After being heated by the heater 4, it boils and evaporates. Through the action of the packing layer 3, the heavy components flow back to the bottom of the column, while the light components are condensed and collected by the condenser 2 and the collector at the top of the column to obtain a high-concentration dimethyl carbonate product. The condenser 2 uses oil at about 160°C as the heat exchange medium to cool the light components at the top of the column. Due to heat exchange, the oil temperature at the outlet of the heat exchange medium of the condenser 2 rises to about 180°C.

[0024] The condenser 2 is connected to the interior of the heat exchanger 6 through an inlet pipe 7b and an outlet pipe 7a. A temperature control mechanism 5, a first temperature sensor 9, and a first flow sensor 2a are installed on the inlet pipe 7b.

[0025] Specifically, the temperature control mechanism 5 is an electric heater or a steam heater; the electric heater is more environmentally friendly and the temperature is easier to control; the steam heater can use the steam main pipe prepared by the heat exchanger 6 in the factory area as the gas source.

[0026] A second flow sensor 2b, a second temperature sensor 9a, a solenoid valve 8, and a delivery pump 7 are installed on the liquid outlet pipe 7a;

[0027] like Figure 3 As shown, in this embodiment, the first flow sensor 2a and the second flow sensor 2b are respectively connected to the flow controller as signal input terminals, wherein the flow controller controls the opening and closing of the solenoid valve 8 according to the difference between the first flow sensor 2a and the second flow sensor 2b.

[0028] As shown in the figure, if there is an increased difference in flow between the first flow sensor 2a and the second flow sensor 2b, it is set as oil leakage in the system pipeline. It is necessary to urgently close the solenoid valve 8 or activate the backup pipeline through the flow controller.

[0029] like Figure 2 As shown, the first temperature sensor 9 and the second temperature sensor 9a are respectively connected to the temperature controller as signal input terminals, wherein the temperature controller regulates the opening and closing of the temperature control mechanism 5 and the solenoid valve 8 according to the difference between the first temperature sensor 9 and the second temperature sensor 9a.

[0030] If the temperature difference between the first temperature sensor 9 and the second temperature sensor 9a is small, then the packing layer 3 is set to be blocked, and the temperature controller adjusts the temperature adjustment mechanism 5 and the solenoid valve 8 to close simultaneously.

[0031] In this embodiment, the heat exchanger 6 is a shell structure, in which a surrounding pipe is arranged to connect the liquid outlet pipe 7a and the liquid inlet pipe 7b respectively, and heat exchange working fluid is transported in the shell structure. The heated portion of the heat exchange working fluid is then added to the plant's main steam pipe for comprehensive utilization.

[0032] The heat exchange medium in the heat exchanger 6 is water, which is transported to the heater 4 through pipes and a delivery pump. In the heat exchanger 6, the flow direction of the heat exchange oil in the pipes is opposite to that of the water, thereby improving the heat exchange efficiency. Since the water in the shell of the heat exchanger 6 cannot be completely converted into steam, it needs to be heated and then transported to the hot water tank through a branch pipe.

[0033] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0034] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A safe and energy-saving chemical distillation column, characterized in that: The system includes a distillation column (1), a condenser (2) disposed at the top of the distillation column (1), a packing layer (3) disposed in the middle of the distillation column (1), and a heater (4) disposed at the bottom of the distillation column (1). The condenser (2) is connected to the interior of a heat exchanger (6) through an inlet pipe (7b) and an outlet pipe (7a). The inlet pipe (7b) is equipped with a temperature control mechanism (5), a first temperature sensor (9), and a first flow sensor (2a). The outlet pipe (7a) is equipped with a second flow sensor (2b), a second temperature sensor (9a), a solenoid valve (8), and a transfer pump (7). The heat exchanger (6) is a shell structure. A surrounding pipe is arranged inside the heat exchanger (6) to connect the outlet pipe (7a) and the inlet pipe (7b) respectively. A heat exchange medium is transported within the shell structure, and a portion of the heat exchange medium after heating is added to the plant's steam main for comprehensive utilization. The first temperature sensor (9) and the second temperature sensor (9a) are respectively connected to the temperature controller as signal input terminals, wherein the temperature controller regulates the opening and closing of the temperature regulating mechanism (5) and the solenoid valve (8) according to the difference between the first temperature sensor (9) and the second temperature sensor (9a).

2. The safe and energy-saving chemical distillation column according to claim 1, characterized in that: The first flow sensor (2a) and the second flow sensor (2b) are respectively connected to the flow controller as signal input terminals, wherein the flow controller controls the opening and closing of the solenoid valve (8) according to the difference between the first flow sensor (2a) and the second flow sensor (2b).

3. The safe and energy-saving chemical distillation column according to claim 1, characterized in that: The temperature control mechanism (5) is an electric heater or a steam heater.

4. The safe and energy-saving chemical distillation column according to claim 1, characterized in that: The heat exchange medium in the heat exchanger (6) is water, which is transported to the heater (4) through pipes and a delivery pump.

5. The safe and energy-saving chemical distillation column according to claim 4, characterized in that: Inside the heat exchanger (6), the flow direction of the heat exchange oil in the pipe is opposite to the flow direction of the water.

6. The safe and energy-saving chemical distillation column according to claim 5, characterized in that: The heated water is then transported to the hot water tank via branch pipes.

Images