Crude benzene tower temperature control device for coke oven gas

Abstract

The utility model relates to the technical field of crude benzol tower cooling equipment, in particular to a crude benzol tower temperature control device for coke oven gas, which comprises a tower body and a reboiler, the top end of the tower body is fixedly connected with a gas outlet pipe, one side of the tower body is fixedly connected with a spray pipe, the spray pipe penetrates through the tower body and extends inwards, and the top end of the tower body is fixedly connected with the reboiler. A heating pipeline is arranged below the spraying pipe, the gas inlet end of the heating pipeline is fixedly connected with the output end of the reboiler, the gas return end of the heating pipeline is fixedly connected with the input end of the reboiler, a thermometer is fixedly connected to the side wall of the tower body, a PLC is fixedly connected to the reboiler, and the PLC is fixedly connected with a water pump. According to the crude benzene tower disclosed by the utility model, the temperature of washing oil in the tower is detected through the thermometer, and then the temperature in the crude benzene tower is controlled by controlling the opening degree of the valve and controlling the steam flow of the heating pipeline through the PLC, so that the crude benzene tower disclosed by the utility model is more energy-saving compared with a traditional control mode that heating and condensation are matched with each other.

Description

Technical Field

[0001] The utility model relates to the technical field of crude benzene tower cooling equipment, in particular to a temperature control device for a crude benzene tower for coke oven gas. Background Art

[0002] A crude benzene tower refers to a washing equipment for the crude benzene washing method. The crude benzene tower is an important equipment in the chemical industry for removing impurities and sulfides and improving the purity and quality of products. The temperature control of the crude benzene tower is an important link to ensure crude benzene recovery and product quality. The temperature of the crude benzene tower should generally be controlled at about 90°C to 92°C. This is because the temperature at which crude benzene vaporizes is roughly within this range. Too high a temperature will cause the gasification of heavy components, while too low a temperature will affect the recovery rate of crude benzene. The crude benzene tower usually uses superheated steam as a heating agent. This heating method makes the equilibrium vapor pressure of crude benzene on the surface of the wash oil greater than the partial pressure of crude benzene in the carrier, thus promoting the countercurrent contact of the vapor-liquid two-phase and carrying out mass transfer and heat transfer. At present, the temperature control of the crude benzene tower is achieved through heating and the associated condensation. This control method has high costs and usually consumes more energy, and will cause waste of a part of heat. Therefore, it is necessary to improve a more energy-saving temperature control device. Summary of the Utility Model

[0003] In view of the above technical problems, the utility model provides an energy-saving temperature control device for a crude benzene tower for coke oven gas.

[0004] To solve the above technical problems, a temperature control device for a crude benzene tower for coke oven gas according to the utility model includes a tower body and a reboiler. The reboiler is arranged outside the tower body. An air outlet pipe is fixedly connected to the top end of the tower body. A spray pipe is fixedly connected to one side of the tower body. The spray pipe penetrates through the tower body and extends inward. The part of the spray pipe located inside the tower body is fixedly connected with a spray head downward. A heating pipeline is arranged below the spray pipe. The air inlet end of the heating pipeline is fixedly connected to the output end of the reboiler, and the air return end of the heating pipeline is fixedly connected to the input end of the reboiler. A thermometer is fixedly connected to the side wall of the tower body. A PLC controller is fixedly connected to the reboiler. The thermometer is communicatively connected with the PLC controller. An air inlet pipe is arranged on one side of the bottom of the tower body, and a liquid outlet pipe is fixedly connected to the other side. A first valve is fixedly connected to the input end of the reboiler. The first valve is controlled by the PLC controller.

[0005] Further, a second valve is fixedly connected to the air inlet pipe.

[0006] Further, the air inlet pipe penetrates through the tower body and extends inward. An aeration port is arranged on the part of the air inlet pipe located inside the tower body.

[0007] Further, the first valve adopts an intelligent valve.

[0008] Furthermore, a control valve is fixedly connected to the liquid outlet pipe.

[0009] The utility model has the following advantages compared with the prior art:

[0010] 1. By arranging a thermometer in the tower to detect the temperature of the wash oil in the tower, the temperature data is then transmitted to the pre-set PLC controller. The PLC controller controls the opening degree of the first valve to control the steam flow in the heating pipeline, thereby realizing the control of the wash oil temperature. Compared with the traditional temperature control method using a heating device and a condensation device in combination, the cost is reduced. Moreover, by reducing the heat energy supply of the heating pipeline to achieve temperature reduction, the utilization rate of heat is high, so it is more energy-saving and consumes less energy. Compared with the traditional cooling method of hot and cold hedging by heating and condensation, a part of heat waste is reduced.

[0011] 2. By changing the air intake method to aeration, the contact area and contact time between the benzene-containing coke oven gas and the wash oil are increased, greatly enhancing the gas washing effect. Description of the Drawings

[0012] Figure 1 It is a schematic structural diagram of the utility model.

[0013] In the figure: 1. Tower body, 2. Reboiler, 3. First valve, 4. Spray pipe, 5. Spray head, 6. Heating pipeline, 7. Gas outlet pipe, 8. Liquid outlet pipe, 9. Air inlet pipe, 10. Second valve, 11. Aeration port, 12. PLC controller, 13. Thermometer, 14. Control valve. Specific Embodiments

[0014] The following further describes the utility model with reference to the accompanying drawings.

[0015] Such as Figure 1A temperature control device for a crude benzene column used for coke oven gas, as shown, includes a column body 1 and a reboiler 2. The reboiler 2 is arranged outside the column body 1. An air outlet pipe 7 is fixedly connected to the top of the column body 1. A spray pipe 4 is fixedly connected to one side of the column body. The spray pipe 4 penetrates the column body 1 and extends inward. A plurality of spray heads 5 are fixedly connected downward to the part of the spray pipe 4 located inside the column body 1. A heating pipeline 6 is arranged below the spray pipe 5. The heating pipeline 6 is spiral inside the column body 1. The air inlet end of the heating pipeline 6 penetrates the column body 1 and is fixedly connected to the output end of the reboiler 2. The air return end of the heating pipeline 6 penetrates the column body 1 and is fixedly connected to the input end of the reboiler 2. A thermometer 13 is fixedly connected to the side wall of the column body 1 for detecting the temperature of the wash oil inside the column body 1. A PLC controller 12 is fixedly connected to the reboiler 2. The thermometer 13 is communicatively connected to the PLC controller. An air inlet pipe 9 is arranged on one side of the bottom of the column body 1, and a liquid outlet pipe 8 is fixedly connected to the other side. A first valve 3 is fixedly connected to the input end of the reboiler 2. The first valve 3 is controlled by the PLC controller 12.

[0016] To facilitate the PLC controller 12 to control the opening and closing degree of the first valve 3, the first valve 3 adopts an intelligent valve.

[0017] To prevent the wash oil inside the column body 1 from flowing back into the air inlet pipe 9, a second valve 10 is fixedly connected to the air inlet pipe 9.

[0018] To increase the contact time and contact area between the benzene-containing coke oven gas and the wash oil inside the column body 1, the air inlet pipe 9 penetrates the column body 1 and extends inward. An aeration port 11 is opened in the part of the air inlet pipe 9 located inside the column body 1.

[0019] To facilitate controlling the discharge flow rate of the liquid outlet pipe 8 and maintaining the liquid level stability of the wash oil inside the column body 1, a control valve 14 is fixedly connected to the liquid outlet pipe 8.

[0020] It should be noted that the reboiler 2, PLC controller 12, and intelligent valve in this embodiment are all existing devices, and their specific structures will not be elaborated too much.

[0021] The working process of this embodiment is as follows:

[0022] During operation, the upper and lower temperature thresholds of the PLC controller 12 are set in advance. The second valve 10 is opened, and the tower body 1 is filled with wash oil that can submerge the heating pipeline 6. The spray pipe 4 uses the spray head 5 to spray circulating wash oil. The benzene-containing coke oven gas enters the tower body 1 from the inlet pipe 9 through the aeration port 11. After mass transfer and heat transfer with the wash oil, finally, the coke oven gas is discharged from the outlet pipe 7, and the wash oil containing benzene, i.e., benzene solvent oil, is discharged from the liquid outlet 8. The reboiler 2 enters the hot steam from the output end into the heating pipeline 6 and finally returns from the input end to heat the wash oil in the tower body 1. The thermometer 13 is responsible for detecting the temperature of the wash oil in the tower body 1. If the detected temperature is too low, after the temperature data is transmitted to the PLC controller 12, the PLC controller 12 controls the first valve 3 to increase the valve opening degree, increasing the steam flow rate in the heating pipeline 6, thereby increasing the heating of the wash oil. If the thermometer 13 detects that the wash oil temperature is too high, the PLC controller 12 controls the first valve 3 to decrease the valve opening degree, reducing the steam flow rate in the heating pipeline 6, thereby cooling the wash oil. Among them, the control valve 14 controls the discharge flow rate of the liquid outlet pipe 8 to maintain the stability of the wash oil liquid level in the tower body 1.

Claims

1. A temperature control device for a crude benzene tower for coke oven gas, comprising a tower body (1) and a reboiler (2), wherein the reboiler (2) is arranged outside the tower body (1), characterized in that; The top of the tower body (1) is fixedly connected to an air outlet pipe (7), and one side of the tower body is fixedly connected to a spray pipe (4), the spray pipe (4) passes through the tower body (1) and extends inwardly, the portion of the spray pipe (4) located inside the tower body (1) is fixedly connected downward to a spray head (5), a heating pipeline (6) is arranged below the spray head (5), the air inlet end of the heating pipeline (6) is fixedly connected to the output end of the reboiler (2), and the air return end of the heating pipeline (6) is fixedly connected to the reboiler ( The tower body (1) is fixedly connected to an input end of the tower body (2); a thermometer (13) is fixedly connected to a side wall of the tower body (1); a PLC controller (12) is fixedly connected to the reboiler (2); the thermometer (13) is communicatively connected to the PLC controller; an air inlet pipe (9) is provided on one side of the bottom of the tower body (1); a liquid outlet pipe (8) is fixedly connected to the other side; a first valve (3) is fixedly connected to the input end of the reboiler (2); the first valve (3) is controlled by the PLC controller (12).

2. The crude benzene tower temperature control device for coke oven gas according to claim 1, characterized in that: The air intake pipe (9) is fixedly connected to a second valve (10).

3. The crude benzene tower temperature control device for coke oven gas according to claim 1, characterized in that: The air inlet pipe (9) passes through the tower body (1) and extends inwardly, and an aeration port (11) is provided at the portion of the air inlet pipe (9) located inside the tower body (1).

4. The crude benzene tower temperature control device for coke oven gas according to claim 1, characterized in that: The first valve (3) is an intelligent valve.

5. The crude benzene tower temperature control device for coke oven gas according to claim 1, characterized in that: The liquid outlet pipe (8) is fixedly connected to a control valve (14).

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