Automatic temperature control system of rectification equipment instrument

Abstract

The utility model belongs to the technical field of rectification process temperature control, and particularly relates to an automatic temperature control system of a rectification equipment instrument, which comprises a rectification tower, a feed port of the rectification tower is connected with an outlet of a feed valve, an inlet of the feed valve is connected with a feed pipeline, and a bottom outlet of the rectification tower is connected with an inlet of a tower bottom pump. An outlet of the tower bottom pump is respectively connected with an inlet of the hot path regulating valve and an inlet of the cold path regulating valve through pipelines, an outlet of the hot path regulating valve is connected with an inlet of the heater, an outlet of the heater is connected with an upper inlet of the rectifying tower, an outlet of the cold path regulating valve is connected with a bottom inlet of the water cooler, and a bottom outlet of the water cooler is connected with a feeding pipeline; a first liquid level controller is arranged on the heater, a temperature controller is arranged on the rectifying tower, and the temperature controller is electrically connected with the first liquid level controller, the cold path regulating valve and the hot path regulating valve respectively. The temperature of the rectifying tower can be adjusted in time, and the temperature of the rectifying tower is kept stable.

Description

Technical Field

[0001] The utility model belongs to the technical field of temperature control in distillation process, and particularly relates to an automatic temperature control system for distillation equipment instruments. Background Art

[0002] Among the four major parameters of pressure, flow rate, liquid level, and temperature in the distillation process, due to the characteristics of serious large lag, time-variation, and non-linearity in temperature control, in the production process, the design of the temperature control system needs to calculate the specific heat enthalpy change during the heat load temperature rise and temperature drop of the process where the controlled object is located. Firstly, load matching needs to be considered to ensure that the temperature control system can match the heat load of the controlled equipment and provide sufficient cooling or heating capacity to maintain a stable temperature under full-load conditions. Secondly, response speed and stability need to be considered. The system should be able to quickly respond to temperature changes within a short time and keep the temperature fluctuation small to ensure the consistency of product quality. The temperature control systems of existing distillation towers are difficult to maintain a stable temperature under full-load conditions and cannot be quickly adjusted according to temperature changes. Summary of the Utility Model

[0003] To solve the above technical problems that the temperature of the distillation tower is difficult to maintain stable and quickly adjusted, the utility model provides an automatic temperature control system for distillation equipment instruments.

[0004] The purpose of the utility model is achieved by adopting the following technical solutions. An automatic temperature control system for distillation equipment instruments according to the utility model includes a distillation tower. The feed inlet of the distillation tower is connected to the outlet of a feed valve, the inlet of the feed valve is connected to a feed pipeline, the bottom outlet of the distillation tower is connected to the inlet of a bottom pump, the outlet of the bottom pump is respectively connected to the inlet of a hot path regulating valve and the inlet of a cold path regulating valve through pipelines, the outlet of the hot path regulating valve is connected to the inlet of a heater, the outlet of the heater is connected to the upper inlet of the distillation tower, the outlet of the cold path regulating valve is connected to the bottom inlet of a water cooler, and the bottom outlet of the water cooler is connected to the feed pipeline; a first liquid level controller is arranged on the heater, a temperature controller is arranged on the distillation tower, and the temperature controller is electrically connected to the first liquid level controller, the cold path regulating valve, and the hot path regulating valve respectively.

[0005] Compared with the prior art, the beneficial effects of the utility model are as follows: By adjusting the opening degrees of the hot path regulating valve and the cold path regulating valve, the temperature of the distillation tower is adjusted in a timely manner and the stability of the temperature of the distillation tower is maintained; and through override control, the safety liquid level of the heater is ensured.

[0006] Further, the instruments of the system are connected to an operation control platform through a network, and the operation control platform includes a DCS controller, an engineer station, and an operation station.

[0007] Compared with the prior art, the beneficial effects of the present utility model are as follows: Through the DCS control system, the parameters of the rectification equipment can be monitored and adjusted in real time and quickly.

[0008] Further, a first air cooler is provided on the reflux pipeline of the rectification column, and the temperature sensor is electrically connected to the first air cooler.

[0009] Further, the outlet of the bottom pump is connected to the inlet of the discharge valve through a corresponding pipeline, and the temperature sensor is electrically connected to the discharge valve.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows: Through the interlock of the temperature sensor with the air cooler and the discharge valve, the temperature of the rectification column is ensured to meet the requirements.

[0011] Further, the feed inlet of the system is respectively connected to the top inlet of the water cooler and the feed pipeline.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows: The raw material can be conveyed to the rectification column through the water cooler or directly as needed.

[0013] Further, a second liquid level controller is provided on the rectification column, and the second liquid level sensor is electrically connected to the feed valve, which can ensure that the liquid level of the rectification column meets the requirements.

[0014] Further, the top outlet of the rectification column is connected to a steam pipeline. Two branch lines of the steam pipeline are respectively connected to the inlet of the first pressure regulating valve and the inlet of the third pressure regulating valve. The outlet of the first pressure regulating valve is connected to the inlet of the condensate tank. The outlet of the third pressure regulating valve is connected to the inlet of the second air cooler. The outlet of the second air cooler is connected to the other inlet of the condensate tank; the reflux port of the condensate tank is connected to the inlet of the reflux pump. The outlet of the reflux pump is connected to the inlet of the first air cooler. The outlet of the first air cooler is connected to the top inlet of the rectification column; the other outlet of the condensate tank is connected to the inlet of the second pressure regulating valve; a pressure controller is provided on the steam pipeline of the rectification column, and the pressure controller is electrically connected to the first pressure regulating valve, the second pressure regulating valve, and the third pressure regulating valve respectively to ensure that the pressure value of the rectification column meets the requirements.

[0015] Further, the top outlet of the water cooler is connected to the reflux pipeline, and the connection position is between the reflux pump and the first air cooler to ensure that the evaporation gas of the water cooler is treated to meet the requirements.

[0016] The above description is only an overview of the technical solution of the present utility model. In order to be able to understand the technical means of the present utility model more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features, and advantages of the present utility model more obvious and understandable, the following specific preferred embodiments are given and described in detail in conjunction with the accompanying drawings as follows. Description of the Drawings

[0017] Figure 1 Schematic diagram of pipeline connection for an embodiment of the automatic temperature control system of the instruments of a rectification device according to the present utility model;

[0018] Figure 2 Schematic diagram of the operation control platform in an embodiment of the automatic temperature control system of the instruments of a rectification device according to the present utility model;

[0019]

Reference Signs

[0020] T101 - rectification column, F101 - heater, F102 - water cooler, F103 - first air cooler, F104 - second air cooler, P101 - bottom pump, P102 - reflux pump, D101 - condensate tank;

[0021] 1 - temperature controller, 2 - first liquid level controller, 3 - second liquid level controller, 4 - hot path regulating valve, 5 - cold path regulating valve, 6 - external discharge valve, 7 - feed valve, 8 - pressure controller, 9 - first pressure regulating valve, 10 - second pressure regulating valve, 11 - third pressure regulating valve, 12 - DCS controller, 13 - engineer station, 14 - operation station. Detailed Embodiment

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0023] An embodiment of the automatic temperature control system of the instruments of a rectification device according to the present utility model, as Figures 1 to 2 shown, includes a rectification device, a temperature control interlock system, and an operation control platform.

[0024] The rectification device includes a rectification column T101, a heater F101 (reboiler), a water cooler F102 (condenser), a first air cooler F103, a second air cooler F104, a condensate tank D101 (reflux tank, condensation tank), a bottom pump P101, a reflux pump P102, as well as pipelines for connecting the above devices and valves provided on the pipelines.

[0025] The temperature control interlock system includes a temperature measuring element, a temperature controller 1, a first liquid level controller 2, a second liquid level controller 3, a hot path regulating valve 4, a cold path regulating valve 5, an external discharge valve 6, and a feed valve 7.

[0026] The operation control platform is basically configured with a DCS (Distributed Control System), including a DCS controller 12, an engineer station 13, an operation station 14, and a network for connecting each device in the system. By controlling and adjusting the parameters of each instrument (including temperature controllers, level controllers, pressure controllers, valves) in the instrument control loop on the operation station 14, parameters such as the level, pressure, temperature, and flow rate of the rectification equipment are controlled, and each parameter of the rectification equipment can be monitored on the display of the operation station 14.

[0027] The feed inlet of the rectification column T101 is connected to the outlet of the feed valve 7, and the inlet of the feed valve 7 is connected to the feed pipeline. The bottom outlet of the rectification column T101 is connected to the inlet of the bottom pump P101, and the outlet of the bottom pump P101 is respectively connected to the inlets of the hot path regulating valve 4, the cold path regulating valve 5, and the discharge valve 6 through pipelines. The outlet of the hot path regulating valve 4 is connected to the inlet of the heater F101, and the outlet of the heater F101 is connected to the upper inlet of the rectification column T101. The outlet of the cold path regulating valve 5 is connected to the bottom inlet of the water cooler F102, and the bottom outlet of the water cooler F102 is connected to the feed pipeline. The feed inlet of the system is respectively connected to the top inlet of the water cooler F102 and the feed pipeline, and raw materials are directly transported to the rectification column T101 or transported to the rectification column T101 through the water cooler F102.

[0028] The top outlet of the rectification column T101 is connected to a steam pipeline, and two branch lines of the steam pipeline are respectively connected to the inlets of the first pressure regulating valve 9 and the third pressure regulating valve 11. The outlet of the first pressure regulating valve 9 is connected to the inlet of the condensate tank D101, and the outlet of the third pressure regulating valve 11 is connected to the inlet of the second air cooler F104. The outlet of the second air cooler F104 is connected to another inlet of the condensate tank D101. The reflux port of the condensate tank D101 is connected to the inlet of the reflux pump P102, the outlet of the reflux pump P102 is connected to the inlet of the first air cooler F103, and the outlet of the first air cooler F103 is connected to the top inlet of the rectification column T101. Another outlet of the condensate tank D101 is connected to the inlet of the second pressure regulating valve 10.

[0029] The top outlet of the water cooler F102 is connected to the reflux pipeline, and the connection position is between the reflux pump P102 and the first air cooler F103. The gas evaporated in the water cooler F102 enters the rectification column T101 through the first air cooler F103.

[0030] A first liquid level controller 2 is arranged on the heater E101, and the first liquid level sensor 2 detects the liquid level of the heater E101 through the liquid level sensor inside the heater E101. A temperature controller 1 and a second liquid level controller 3 are arranged on the distillation column T101. The temperature controller 1 detects the temperature inside the distillation column T101 through the temperature measuring element inside the distillation column T101, and the second liquid level controller 3 detects the liquid level inside the distillation column T101 through the liquid level sensor inside the distillation column T101.

[0031] The temperature controller 1 is electrically connected to the first air cooler F103, the external discharge valve 6, the first liquid level controller 2, the cold path regulating valve 5, and the hot path regulating valve 4 respectively, and the second liquid level controller 3 is electrically connected to the feed valve 7.

[0032] A pressure controller 8 is arranged on the steam pipeline of the distillation column T101. The pressure controller 8 detects the pressure value of the steam pipeline through the pressure sensor inside the steam pipeline. The pressure controller 8 is electrically connected to the first pressure regulating valve 9, the second pressure regulating valve 10, and the third pressure regulating valve 11 respectively. By detecting the pressure value of the steam pipeline, the pressure value inside the distillation column T101 is obtained, and the opening and closing of each pressure regulating valve are controlled according to the pressure value, so as to control the pressure value inside the distillation column T101. After the steam is cooled in the condensate tank D101, it can be transported back to the distillation column T101 through the reflux pump P102.

[0033] After the system runs, the temperature of the process medium in the distillation column T101 will be heated from room temperature and slowly rise to the set value, such as 55 degrees. The heating process is automatically controlled by the temperature controller 1, so that the hot path regulating valve 4 is fully opened and the cold path regulating valve 5 is fully closed. The process medium in the distillation column T101 is transported to the heater E101 for heating through the bottom pump P101 of the column, and then transported to the distillation column T101; after the temperature exceeds 55 degrees, under the automatic control of the temperature controller 1, the hot path regulating valve 4 gradually changes in the closing direction, and the cold path regulating valve 5 gradually changes in the opening direction, reducing the heating of the process medium, so that part of the process medium enters the distillation column T101 after passing through the bottom pump P101, the water cooler F102, the feed pipeline, and the feed valve 7; on the contrary, when the temperature is lower than the set value, under the automatic control of the temperature controller 1, the hot path regulating valve 4 gradually changes in the opening direction, and the cold path regulating valve 5 gradually changes in the closing direction. By adjusting the opening degrees of the hot path regulating valve and the cold path regulating valve, the temperature of the distillation column is adjusted in time and the temperature of the distillation column is maintained stable.

[0034] When the temperature is higher than the alarm value, such as 65 degrees, the temperature controller 1 issues an alarm and interlocks to start the first air cooler E103, reducing the temperature of the reflux liquid in the reflux pipeline. After the reflux liquid enters the distillation tower, the distillation tower is cooled down; when the temperature continues to rise and is higher than the high alarm value, such as 80 degrees, the temperature sensor 1 interlocks to start the hot material discharge valve 6, so that the distillation tower T101 lowers the liquid level due to the discharge of hot materials, and the second liquid level controller 3 automatically controls the opening of the feed valve 7 to add fresh raw materials until the distillation tower liquid level reaches the set value, and then the feed valve 7 is closed; on the contrary, when the temperature is lower than the high alarm value, such as 80 degrees, the hot material discharge valve 6 is interlocked to close, and when it is lower than the alarm value, such as 65 degrees, the first air cooler F103 is interlocked to stop operation. The temperature sensor ensures that the temperature of the distillation tower meets the requirements by interlocking with the air cooler and the discharge valve.

[0035] When the liquid level of heater F101 is lower than the set value, such as 25% of the capacity of heater F101, the first liquid level controller 2 automatically replaces the temperature controller 1 to achieve overrun control. At this time, the opening of the cold circuit regulating valve 5 is reduced, and the opening of the hot circuit regulating valve 4 is increased to ensure that the liquid level of heater F101 is not lower than the safe liquid level; when the liquid level exceeds the safe liquid level, the first liquid level controller 2 automatically exits the control right, and the temperature controller 1 continues to automatically control the temperature. Through overrun control, the safe liquid level of the heater is guaranteed.

[0036] In other embodiments, the operator may also manually intervene and adjust the instrument according to the data displayed on the instrument and the process requirements, such as adjusting control parameters, switching control modes, etc., to achieve automatic control of liquid level, pressure, temperature, and flow.

[0037] Aiming at the complexity of temperature control of distillation equipment, the utility model provides an automatic temperature control system for instruments of distillation equipment to realize automatic temperature control of distillation equipment.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic temperature control system for a rectification equipment instrument, comprising a rectification column, characterized in that: The feed inlet of the rectifying column is connected to the outlet of the feed valve. The inlet of the feed valve is connected to the feed pipeline. The bottom outlet of the rectifying column is connected to the inlet of the bottom pump. The outlet of the bottom pump is respectively connected to the inlet of the hot path regulating valve and the inlet of the cold path regulating valve through pipelines. The outlet of the hot path regulating valve is connected to the inlet of the heater. The outlet of the heater is connected to the upper inlet of the rectifying column. The outlet of the cold path regulating valve is connected to the bottom inlet of the water cooler. The bottom outlet of the water cooler is connected to the feed pipeline. A first liquid level controller is arranged on the heater, and a temperature controller is arranged on the rectifying column. The temperature controller is electrically connected to the first liquid level controller, the cold path regulating valve, and the hot path regulating valve respectively.

2. The automatic temperature control system for the rectification equipment instrument according to claim 1, characterized in that: The instruments of this system are connected to the operation control platform through a network. The operation control platform includes a DCS controller, an engineer station, and an operation station.

3. An automatic temperature control system for a rectification equipment instrument according to claim 1, characterized in that: A first air cooler is arranged on the reflux pipeline of the rectifying column, and a temperature sensor is electrically connected to the first air cooler.

4. An automatic temperature control system for a rectification equipment instrument according to claim 1, characterized in that: The outlet of the bottom pump is connected to the inlet of the discharge valve through a corresponding pipeline, and a temperature sensor is electrically connected to the discharge valve.

5. An automatic temperature control system for a rectification equipment instrument according to claim 1, characterized in that: The feed inlet of this system is respectively connected to the top inlet of the water cooler and the feed pipeline.

6. The automatic temperature control system for the rectification equipment instrument according to claim 1, wherein: A second liquid level controller is arranged on the rectifying column, and a second liquid level sensor is electrically connected to the feed valve.

7. An automatic temperature control system for a rectification equipment instrument according to claim 1, characterized in that: The top outlet of the rectifying column is connected to a steam pipeline. Two branch lines of the steam pipeline are respectively connected to the inlet of the first pressure regulating valve and the inlet of the third pressure regulating valve. The outlet of the first pressure regulating valve is connected to the inlet of the condensate tank. The outlet of the third pressure regulating valve is connected to the inlet of the second air cooler. The outlet of the second air cooler is connected to another inlet of the condensate tank. The reflux port of the condensate tank is connected to the inlet of the reflux pump. The outlet of the reflux pump is connected to the inlet of the first air cooler. The outlet of the first air cooler is connected to the top inlet of the rectifying column. Another outlet of the condensate tank is connected to the inlet of the second pressure regulating valve. A pressure controller is arranged on the steam pipeline of the rectifying column. The pressure controller is electrically connected to the first pressure regulating valve, the second pressure regulating valve, and the third pressure regulating valve respectively.

8. An automatic temperature control system for a rectification equipment instrument according to claim 7, characterized in that: The top outlet of the water cooler is connected to the reflux pipeline, and the connection position is between the reflux pump and the first air cooler.

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