Low-pressure condensed water treatment device of naphtha separation system

Abstract

A low-pressure condensed water treatment device of a naphtha separation system comprises a pressure-bearing tank and a condensed water output assembly, the pressure-bearing tank is located on the ground, a water inlet of the pressure-bearing tank is connected with a low-pressure condensed water main pipe of the naphtha separation system, and the condensed water output assembly is connected to a water outlet of the pressure-bearing tank. And a water inlet main gate valve is arranged on a pipeline between the water inlet of the pressure-bearing tank and a low-pressure condensed water main pipe of the naphtha separation system. The condensed water output by the naphtha separation system is collected through the pressure-bearing tank, steam contained in the condensed water is liquefied by increasing pressure, meanwhile, the pressure-bearing tank is placed on the ground to exchange heat with the ground, liquefaction of the steam in the condensed water is accelerated, it is guaranteed that no steam is contained in the output condensed water, and energy is saved. Therefore, leakage caused by flushing of pipelines and elbows is avoided, and stable operation of the naphtha separation system is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of condensate water treatment, and particularly relates to a low-pressure condensate water treatment device for a naphtha separation system. Background Technique

[0002] Naphtha, also known as chemical light oil and crude gasoline, is a light oil used as a chemical raw material processed from crude oil or other raw materials. It is mainly used as a chemical raw material for producing products such as ethylene, aromatics or high-octane gasoline. Since the fractions of naphtha used for producing different products are different, the produced naphtha needs to be separated into different fractions in a naphtha separation system to facilitate the subsequent processing of different products.

[0003] The naphtha separation system includes a naphtha separation tower, a reboiler and a condensate water collection unit. Since the low-pressure steam reboiler uses 0.5 MPa steam as the heat source, condensate water is generated after heat exchange. Since there is a certain amount of low-pressure steam in the condensate water, which is a steam-water mixture, the condensate water is sent to the condensate water collection unit. The existing condensate water collection unit is an atmospheric tank at a certain height from the ground, and a heat exchanger is arranged at the top of the atmospheric tank. After the condensate water enters the atmospheric tank and exchanges heat through the heat exchanger, the output condensate water is sent to the condensate water pipe network through a steam trap. Since the condensate water collection unit is an atmospheric tank, the output condensate water is severely steam-carrying, resulting in severe steam-carrying during the use of the steam trap, causing long-term erosion and thinning at the elbow of the pipeline and appearing leakage points, posing a potential hazard to the stable operation of the system. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to improve the problem of erosion of the condensate water pipeline, and provide a low-pressure condensate water treatment device for a naphtha separation system with a long service life and a simple structure.

[0005] The technical solution adopted to solve the above technical problem is: a low-pressure condensate water treatment device for a naphtha separation system, including a pressure-bearing tank and a condensate water output assembly. The pressure-bearing tank is located on the ground. The water inlet of the pressure-bearing tank is connected to the low-pressure condensate water main pipe of the naphtha separation system, and a condensate water output assembly is connected to the water outlet. An inlet main gate valve is arranged on the pipeline between the water inlet of the pressure-bearing tank and the low-pressure condensate water main pipe of the naphtha separation system.

[0006] As a preferred technical solution, a water delivery control main gate valve is arranged on the pipeline between the outlet of the pressure-bearing tank and the condensate water output assembly.

[0007] As a preferred technical solution, the condensate water output assembly includes two groups of parallel delivery pump assemblies and a condensate water total output pipe. The inlets of the two groups of parallel delivery pump assemblies are connected to the outlet of the water delivery control main gate valve through pipelines, and the outlets are connected to the condensate water total output pipe through pipelines;

[0008] The described transfer pump assembly includes a stop valve, a check valve, a Y-shaped filter, and a transfer pump;

[0009] The inlet of the first branch inlet gate valve is connected to the outlet of the stop valve through a pipeline and is connected to the outlet of the water conveyance control main gate valve. The outlet of the first branch inlet gate valve is connected to the inlet of the transfer pump through a Y-shaped filter; the outlet of the stop valve is connected to the condensate main output pipe through a pipeline;

[0010] On the pipeline between the outlet of the transfer pump and the condensate main output pipe, a check valve and a first branch outlet gate valve are sequentially arranged along the transfer direction.

[0011] As a preferred technical solution, a first branch pipe is connected to the pipeline between the outlet of the first branch inlet gate valve and the inlet of the Y-shaped filter, and a first gate valve is arranged on the first branch pipe.

[0012] As a preferred technical solution, a second branch pipe is connected to the pipeline between the outlet of the transfer pump and the check valve, and a second gate valve is arranged on the second branch pipe.

[0013] As a preferred technical solution, a third branch pipe is connected to the pipeline between the check valve and the first branch outlet gate valve, and a third gate valve is arranged on the third branch pipe.

[0014] As a preferred technical solution, a pneumatic valve is arranged on the condensate main output pipe.

[0015] The beneficial effects of the present utility model are as follows:

[0016] The present utility model collects the condensate water output by the naphtha separation system through a pressure-bearing tank and liquefies the gas contained in the condensate water by increasing the pressure. At the same time, the pressure-bearing tank is placed on the ground to exchange heat with the earth, accelerating the liquefaction of the gas in the condensate water, ensuring that the output condensate water does not carry gas, thereby avoiding erosion of the pipeline and elbows and then causing leakage, and ensuring the stable operation of the naphtha separation system. Description of the Drawings

[0017] Figure 1 is a structural schematic diagram of the present utility model.

[0018] Wherein: the total water inlet gate valve 1, the pressure-bearing tank 2, the water conveyance control main gate valve 3, the stop valve 4, the first branch outlet gate valve 5, the first branch inlet gate valve 6, the third gate valve 7, the check valve 8, the second gate valve 9, the transfer pump 10, the Y-shaped filter 11, the first gate valve 12, the pneumatic valve 13, the condensate main output pipe 14. Detailed Embodiments

[0019] The present utility model will be further described in detail below in conjunction with the drawings and embodiments, but the present utility model is not limited to the following embodiments.

[0020] InFigure 1 In a low-pressure condensate water treatment device for a naphtha separation system according to this embodiment, it includes a pressure-bearing tank 2 and a condensate water output assembly. The pressure-bearing tank 2 is located on the ground. The pressure-bearing tank 2 is used to collect condensate water and liquefy the gas contained in the condensate water by increasing the pressure. The water inlet of the pressure-bearing tank 2 is connected to the low-pressure condensate water main pipe of the naphtha separation system, and a condensate water output assembly is connected to the water outlet. An inlet main gate valve 1 is installed on the pipeline between the water inlet of the pressure-bearing tank 2 and the low-pressure condensate water main pipe of the naphtha separation system, and a water delivery control main gate valve 3 is arranged on the pipeline between the outlet of the pressure-bearing tank 2 and the condensate water output assembly.

[0021] The condensate water output assembly of this embodiment includes two groups of parallel delivery pump assemblies and a condensate water total output pipe 14. The inlets of the two groups of parallel delivery pump 10 assemblies are connected to the outlet of the water delivery control main gate valve 3 through pipelines, and the outlets are connected to the condensate water total output pipe 14 through pipelines. One of the two groups of parallel delivery pump assemblies is an operating device, and the other is a standby device. When a failure occurs in one of the operating delivery pumps, the standby delivery pump starts immediately to ensure the continuous operation of the system, avoid production interruption, and the standby device can take over the work during the maintenance process, thereby reducing the downtime. In some cases, the two delivery pumps can operate simultaneously to share the load, especially when the high-flow demand can improve the processing capacity of the system.

[0022] The delivery pump assembly includes a stop valve 4, a check valve 8, a Y-shaped filter 11, a delivery pump 10, a first branch inlet gate valve 6, and a first branch outlet gate valve 5.

[0023] The inlet of the first branch inlet gate valve 6 and the inlet of the stop valve 4 are connected to the outlet of the water delivery control main gate valve 3 through pipelines, and the outlet of the first branch inlet gate valve 6 is connected to the inlet of the delivery pump 10 through the Y-shaped filter 11; the outlet of the stop valve 4 is connected to the condensate water total output pipe 14 through a pipeline. The stop valve 4 controls the inlet flow rate of the delivery pump 10 to adjust the working state of the pump, and cuts off the inlet of the delivery pump 10 during maintenance or repair to prevent fluid from entering the pump body.

[0024] A check valve 8 and a first branch outlet gate valve 5 are successively installed on the pipeline between the outlet of the delivery pump 10 and the condensate water total output pipe 14 along the delivery direction. The check valve 8 is used to prevent the condensate water from flowing back when the delivery pump 10 stops working, and protects the pump and the pipeline system from the influence of backflow.

[0025] A first branch pipe is connected to the pipeline between the outlet of the first branch inlet valve 6 and the inlet of the Y-shaped filter 11, and a first gate valve 12 is installed on the first branch pipe. A second branch pipe is connected to the pipeline between the outlet of the transfer pump 10 and the check valve 8, and a second gate valve 9 is installed on the second branch pipe. A third branch pipe is connected to the pipeline between the check valve 8 and the first branch outlet valve 5, and a third gate valve 7 is installed on the third branch pipe. A pneumatic valve 13 is installed on the total condensate output pipe 14. The pneumatic valve 13 is used to quickly control the fluid flow of the total condensate output pipe 14 to cope with emergencies or perform system regulation.

[0026] The first gate valve 12, the second gate valve 9, and the third gate valve 7 are used to release pressure and drain water when a failure occurs in the pipe section where each branch pipe is located, facilitating maintenance.

Claims

1. A low-pressure condensate treatment device for a naphtha separation system, characterized in that: It includes a pressure tank and a condensate output assembly. The pressure tank is located on the ground. The water inlet of the pressure tank is connected to the low-pressure condensate main pipe of the naphtha separation system, and the condensate output assembly is connected to the water outlet. A water inlet main gate valve is arranged on the pipeline between the water inlet of the pressure tank and the low-pressure condensate main pipe of the naphtha separation system. The condensate output assembly includes two sets of parallel delivery pump assemblies and a condensate main output pipe. The inlets of the two sets of parallel delivery pump assemblies are connected through the outlet of the pipeline water delivery control main gate valve, and the outlets are connected to the condensate main output pipe through a pipeline. The delivery pump assembly includes a stop valve, a check valve, a Y-shaped filter, a delivery pump, a first branch inlet valve, and a first branch outlet valve; The inlet of the first branch gate valve and the inlet of the stop valve are connected to the outlet of the water delivery control main gate valve through a pipeline, and the outlet of the first branch gate valve is connected to the inlet of the delivery pump through a Y-shaped filter; the outlet of the stop valve is connected to the main condensate output pipe through a pipeline; A check valve and a first branch outlet valve are sequentially arranged on the pipeline between the delivery pump outlet and the condensate main output pipe along the delivery direction.

2. The low-pressure condensate treatment device of the naphtha separation system according to claim 1, characterized in that: A water delivery control main gate valve is arranged on the pipeline between the outlet of the pressure tank and the condensate output assembly.

3. The low-pressure condensate treatment device of the naphtha separation system according to claim 1, characterized in that: A first branch pipe is connected to the pipeline between the outlet of the first branch inlet gate valve and the inlet of the Y-shaped filter, and a first gate valve is arranged on the first branch pipe.

4. The low-pressure condensate treatment device of the naphtha separation system according to claim 1, characterized in that: A second branch pipe is connected to the pipeline between the delivery pump outlet and the check valve, and a second gate valve is arranged on the second branch pipe.

5. The low-pressure condensate treatment device of the naphtha separation system according to claim 1, characterized in that: The pipeline between the check valve and the first branch outlet gate valve is connected to a third branch pipe, and a third gate valve is arranged on the third branch pipe.

6. The low-pressure condensate treatment device of the naphtha separation system according to claim 1, characterized in that: A pneumatic valve is arranged on the condensed water main output pipe.

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