Device for improving heat exchange effect of circulating water of cooler at top of crude styrene tower

Abstract

According to the device for improving the heat exchange effect of the circulating water of the tower top cooler of the crude styrene tower, the booster pump is additionally arranged at the inlet of the circulating water main pipe of the tower top cooler of the crude styrene tower, so that scaling and deposition of a pipe layer of the tower top cooler of the crude styrene tower caused by low pressure and flow flowing through the tower top cooler of the crude styrene tower can be avoided; and the circulating water heat exchange effect of the crude styrene tower top cooler is improved. By additionally arranging the booster pump, the pressure of circulating water flowing through the cooler at the top of the crude styrene tower of the heat exchanger can be increased by 0.04 MPa, the flow of the circulating water flowing through the cooler at the top of the crude styrene tower is increased by 1900 kg / h, and the outlet temperature of the cooler at the top of the crude styrene tower meets the requirement.

Description

Technical Field

[0001] This utility model belongs to the field of styrene production technology, specifically relating to a device for improving the heat exchange effect of circulating water in the top cooler of a crude styrene tower. Background Technology

[0002] The crude styrene column uses a top cooler (E-402) to cool the material at the top of the column, causing it to partially or completely condense into a liquid. On the one hand, cooling the material into a liquid for reflux within the column provides the necessary liquid phase reflux for processes such as fractionation, ensuring the stable operation of mass and heat transfer processes within the column, thereby improving the separation efficiency and quality of the product. On the other hand, it allows the top product to be collected in liquid form for easier subsequent processing.

[0003] The installation height of the crude styrene tower top cooler (E-402) is 30.6m. After the circulating water passes through the refined styrene tower top cooler (E-410), it flows through the crude styrene tower top cooler (E-402). The inlet flow rate and pressure of the circulating water through the tube layer of the crude styrene tower top cooler (E-402) are relatively low, which easily leads to blockage of the tube bundle of the crude styrene tower top cooler (E-402), resulting in the shell-side outlet temperature TI-4005 of the crude styrene tower top cooler (E-402) being higher than 45℃. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] This invention proposes a device to improve the heat exchange effect of circulating water in the top cooler of a crude styrene tower, in order to solve the technical problem that the low inlet flow rate and pressure of circulating water through the tube layer of the top cooler of the crude styrene tower leads to scaling and deposition in the tube layer, which in turn blocks the heat exchanger tube bundle and affects the heat exchange effect.

[0006] (II) Technical Solution

[0007] To address the aforementioned technical problems, this utility model proposes a device for improving the heat exchange effect of the circulating water in the top cooler of a crude styrene tower. The device includes a booster pump; the inlet of the booster pump is connected to the main circulating water pipe via a main pump inlet pipeline, and the outlet of the booster pump is connected to a main pump outlet pipeline with an outlet valve; the main pump outlet pipeline is connected to the inlet of the top cooler of a refined styrene tower; the outlet of the refined styrene tower top cooler is connected to the inlet of the top cooler of the crude styrene tower via the outlet pipeline of the refined tower heat exchanger; and the outlet of the crude styrene tower top cooler is connected to the return water in the main circulating water pipe via the outlet pipeline of the crude tower heat exchanger.

[0008] Furthermore, an air vent valve is installed on the main pump inlet pipeline. When the pump is under maintenance, the valve is closed to vent the air.

[0009] Furthermore, a backflow valve is installed on the main pump outlet pipeline for emptying the backflow valve, which is used when the pump is being emptied during maintenance.

[0010] Furthermore, an outlet flow meter is installed on the main pump outlet pipeline near the inlet of the top cooler of the refined styrene tower.

[0011] Furthermore, the device includes a booster standby pump connected in parallel with the booster main pump; the inlet of the booster standby pump is provided with a standby pump inlet pipeline connected to the circulating water main pipe, the outlet of the booster standby pump is provided with a standby pump outlet pipeline, and the outlet valve of the booster standby pump is provided on the standby pump outlet pipeline; the standby pump outlet pipeline and the main pump outlet pipeline are connected together to the inlet of the top cooler of the refined styrene tower.

[0012] Furthermore, an air vent valve is installed on the standby pump inlet pipeline. When the pump is under maintenance, the valve is closed to empty the system.

[0013] Furthermore, a backflow valve is installed on the standby pump outlet pipeline for emptying the backflow, which is used when the pump is being emptied during maintenance.

[0014] (III) Beneficial Effects

[0015] This invention proposes a device to improve the heat exchange efficiency of the circulating water in the top cooler of a crude styrene tower. A booster pump is added to the inlet of the main circulating water pipe of the top cooler, which prevents low pressure and flow rate from causing scaling and deposits in the pipe layers, thus improving the heat exchange efficiency of the circulating water. By adding the booster pump, the pressure of the circulating water flowing through the heat exchanger in the top cooler of the crude styrene tower can be increased by 0.04 MPa, and the flow rate can be increased by 1900 kg / h, ensuring that the outlet temperature of the top cooler meets the requirements. Attached Figure Description

[0016] Figure 1 This is a schematic diagram illustrating the composition and principle of the device for improving the heat exchange effect of the circulating water in the top cooler of a crude styrene tower according to this utility model. Detailed Implementation

[0017] To make the objectives, contents, and advantages of this utility model clearer, the specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples.

[0018] This embodiment proposes a device for improving the heat exchange effect of the circulating water in the top cooler of a crude styrene tower. Its composition and principle are as follows: Figure 1As shown, it mainly includes the main booster pump 3 (P-425) and the backup booster pump 14 (P-425S).

[0019] The main booster pump 3 (P-425) has a main pump inlet pipeline 1 connected to the circulating water main pipe. The main pump inlet pipeline 1 is equipped with a first valve 2 (to be closed and emptied during pump maintenance). The main booster pump 3 (P-425) has a main pump outlet pipeline 4. The main pump outlet pipeline 4 is equipped with a second valve 5 (for venting and backflow prevention, used during pump maintenance and backflow prevention) and a third valve 6 (as the outlet valve of the main booster pump 3).

[0020] The booster backup pump 14 (P-425S) is equipped with a backup pump inlet pipeline 12 that is connected to the main circulating water pipe. A fourth valve 13 is installed on the backup pump inlet pipeline 12 (to be closed and emptied during pump maintenance). The booster backup pump 14 (P-425S) is equipped with a backup pump outlet pipeline 15. A fifth valve 16 (used for venting and backflow prevention, and used during pump maintenance and backflow prevention) and a sixth valve 17 (serving as the outlet valve of the booster backup pump 14) are installed on the backup pump outlet pipeline 15.

[0021] The main pump outlet pipeline 4 and the standby pump outlet pipeline 15 are connected to the inlet of the top cooler 8 (E-410) of the refined styrene tower, and an outlet flow meter 7 is installed near the inlet of the top cooler 8 (E-410) of the refined styrene tower.

[0022] The outlet of the top cooler 8 (E-410) of the refined styrene tower is connected to the inlet of the top cooler 10 (E-402) of the crude styrene tower through the outlet pipeline 9 of the refined tower heat exchanger; the outlet of the top cooler 10 (E-402) of the crude styrene tower is connected to the return water of the circulating water main through the outlet pipeline 11 of the crude tower heat exchanger.

[0023] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A device for improving the heat exchange effect of circulating water in the top cooler of a crude styrene tower, characterized in that, The device includes a booster main pump; the inlet of the booster main pump is connected to the main circulating water main pipe via a main pump inlet pipeline, and the outlet of the booster main pump is connected to a main pump outlet pipeline, with an outlet valve on the main pump outlet pipeline; the main pump outlet pipeline is connected to the inlet of the top cooler of the refined styrene tower; the outlet of the top cooler of the refined styrene tower is connected to the inlet of the top cooler of the crude styrene tower via the outlet pipeline of the refined tower heat exchanger; the outlet of the top cooler of the crude styrene tower is connected to the return water of the main circulating water main pipe via the outlet pipeline of the crude tower heat exchanger.

2. The apparatus for improving the heat exchange effect of the circulating water in the top cooler of a crude styrene tower as described in claim 1, characterized in that, An air vent valve is installed on the main pump inlet pipeline. When the pump is under maintenance, the valve is closed to vent the pump.

3. The apparatus for improving the heat exchange effect of the circulating water in the top cooler of a crude styrene tower as described in claim 1, characterized in that, A backflow valve is installed on the main pump outlet pipeline for emptying backflow, which is used when the pump needs to be emptied during maintenance.

4. The apparatus for improving the heat exchange effect of the circulating water in the top cooler of a crude styrene tower as described in claim 1, characterized in that, An outlet flow meter is installed on the main pump outlet pipeline near the inlet of the cooler at the top of the styrene tower.

5. The apparatus for improving the heat exchange effect of the circulating water in the top cooler of a crude styrene tower as described in claim 1, characterized in that, The device includes a booster standby pump connected in parallel with the booster main pump; the booster standby pump has an inlet pipeline connected to the circulating water main pipe, and an outlet pipeline connected to the booster standby pump, with an outlet valve on the outlet pipeline; the standby pump outlet pipeline and the main pump outlet pipeline are connected to the inlet of the top cooler of the refined styrene tower.

6. The apparatus for improving the heat exchange effect of the circulating water in the top cooler of a crude styrene tower as described in claim 5, characterized in that, An air vent valve is installed on the inlet pipeline of the standby pump. When the pump is under maintenance, the valve is closed to empty the system.

7. The apparatus for improving the heat exchange effect of the circulating water in the top cooler of a crude styrene tower as described in claim 5, characterized in that, A backflow valve is installed on the outlet pipeline of the standby pump for emptying backflow, which is used when the pump is being emptied during maintenance.

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