Method for recycling deposited water in dehydrogenation liquid storage tank

Abstract

The invention relates to the field of chemical engineering, and discloses a method for recycling deposited water in a dehydrogenation liquid storage tank, which comprises the following steps of: designing a system: connecting a pipeline with proper diameter and flow capacity to a drainage pipeline at the bottom of the dehydrogenation liquid storage tank, and connecting the pipeline to the top of a crude styrene settling tank. According to the method for recycling the deposited water of the dehydrogenation liquid storage tank, the deposited water system of the dehydrogenation liquid storage tank is transformed, water and a small part of materials can be fully recycled after transformation, oil-containing water does not need to be subjected to sewage treatment, the sewage treatment difficulty is reduced, the possibility of environmental pollution is avoided, and moreover, the cost is reduced. And the added pipeline can fully recycle materials, so that the reprocessing frequency of the materials is reduced, and the processing cost is reduced.

Description

Technical Field

[0001] The present invention relates to the chemical industry field, and specifically to a method for recycling deposited water in a dehydrogenated liquid storage tank. Background Art

[0002] The dehydrogenated liquid storage tank is used to receive crude styrene from a crude styrene settling tank, and then send it to the styrene rectification section for separation. Since both crude styrene and process condensate exist in the crude styrene settling tank, oil-water separation is carried out with process condensate by the method of natural sedimentation. The water content in the crude styrene entering the dehydrogenated liquid storage tank is relatively high, and a large amount of water will accumulate at the bottom of the dehydrogenated liquid storage tank, affecting the material metering in the storage tank area. When the water level reaches a certain height and is pumped to the rectification section with the dehydrogenated liquid pump, it will affect the operation of the entire styrene rectification section. Therefore, the dehydrogenated liquid storage tank needs to be dehydrated regularly.

[0003] However, the existing treatment method is to treat the oil-containing water for sewage treatment, which increases the difficulty of sewage treatment and causes waste of materials and water resources to a certain extent. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the present invention provides a method for recycling deposited water in a dehydrogenated liquid storage tank to solve the above problems.

[0006] (2) Technical Solutions

[0007] To achieve the above object, the present invention provides the following technical solutions: A method for recycling deposited water in a dehydrogenated liquid storage tank, comprising the following steps:

[0008] System Design: Connect a pipeline with an appropriate diameter and flow capacity to the drainage pipeline at the bottom of the dehydrogenated liquid storage tank and connect it to the top of the crude styrene settling tank;

[0009] Oil-Water Separation: An oil-water separation device, such as an oil separator and a sedimentation tank, is arranged in the crude styrene settling tank for efficient oil-water separation. By adjusting the parameters of the oil-water separation device, the quality and efficiency of the recycled water and materials are maximized;

[0010] Wastewater Pretreatment: Before the accumulated water at the bottom enters the crude styrene settling tank, a solid-liquid separation device, such as a sedimentation tank or a filter, is arranged to preliminarily treat the suspended substances and reduce the content of solid particles in the wastewater;

[0011] Material Recovery: Customize the material recovery process, and further separate and purify according to the characteristics of the waste and the properties of the target substance by using material recovery equipment;

[0012] Subsequent monitoring: Ensure the safety of operations through leakage control devices and automatic monitoring systems, regularly monitor the effectiveness of wastewater recovery and material recovery, and use water quality analysis to evaluate the efficiency of oil-water separation and material recovery.

[0013] Preferably, the oil-water separation equipment includes an oil separator and a sedimentation tank.

[0014] Preferably, the solid-liquid separation equipment includes a sedimentation tank and a filter.

[0015] According to another aspect of the embodiments of the present invention, a system for recovering sediment water from a dehydrogenated liquid storage tank is provided, including a dehydrogenated liquid storage tank, a crude styrene settling tank, connecting pipes, oil-water separation equipment, and solid-liquid separation equipment. The dehydrogenated liquid storage tank is used to store dehydrogenated liquid and bottom accumulated water, providing a container for centralized storage of wastewater and materials; the crude styrene settling tank is used for oil-water separation. By setting up oil-water separation equipment, the bottom accumulated water is separated from the oil, realizing the effective separation and recovery of oil and water; the connecting pipes are used to connect the dehydrogenated liquid storage tank and the crude styrene settling tank, and transfer the bottom accumulated water from the storage tank to the settling tank; the oil-water separation equipment is used to separate the oil and water in the bottom accumulated water, separating the oil in the wastewater for subsequent treatment and recovery; the solid-liquid separation equipment is used for preliminary solid particle separation treatment of the bottom accumulated water, separating the suspended solids in the wastewater, reducing the load on subsequent treatment equipment, and improving the efficiency of the system.

[0016] Preferably, the oil-water separation equipment includes an oil separator, a hydrocyclone, and a centrifuge.

[0017] Preferably, the solid-liquid separation equipment includes a sedimentation tank and a filter.

[0018] (III) Beneficial effects

[0019] Compared with the prior art, the present invention provides a method for recycling sediment water from a dehydrogenated liquid storage tank, having the following beneficial effects:

[0020] This method for recycling sediment water from a dehydrogenated liquid storage tank, through the transformation of the sediment water system of the dehydrogenated liquid storage tank, can fully recover water and a small amount of materials after transformation. The oil-containing water does not need to enter the sewage treatment, reducing the difficulty of sewage treatment and avoiding the possibility of environmental pollution. Moreover, the added pipelines can fully recover and utilize the materials, reducing the number of reprocessing times of the materials and lowering the processing cost. Specific embodiments

[0021] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] It should be understood that in various embodiments of the present invention, the sequence numbers of the processes do not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0023] It should be understood that in the present invention, "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0024] A method for recycling the deposited water in a dehydrogenated liquid storage tank includes the following steps:

[0025] System design: Connect a pipeline with an appropriate diameter and flow capacity to the drainage pipeline at the bottom of the dehydrogenated liquid storage tank and connect it to the top of the crude styrene settling tank.

[0026] Oil-water separation: Install oil-water separation equipment, such as an oil separator and a sedimentation tank, in the crude styrene settling tank for efficient oil-water separation. By adjusting the parameters of the oil-water separation equipment, the quality and efficiency of the recycled water and materials can be maximized.

[0027] Wastewater pretreatment: Install solid-liquid separation equipment, such as a sedimentation tank or a filter, before the accumulated water at the bottom enters the crude styrene settling tank to preliminarily treat the suspended substances and reduce the content of solid particles in the wastewater.

[0028] Material recovery: Customize the material recovery process. According to the characteristics of the waste and the properties of the target substance, use material recovery equipment for further separation and purification.

[0029] Subsequent monitoring: Ensure the safety of the operation through a leakage control device and an automatic monitoring system, and regularly monitor the effects of wastewater recovery and material recovery. Use water quality analysis to evaluate the efficiency of oil-water separation and material recovery.

[0030] Among them: The oil-water separation equipment includes an oil separator and a sedimentation tank, and the solid-liquid separation equipment includes a sedimentation tank and a filter.

[0031] According to another aspect of the embodiments of the present invention, a dehydrogenation liquid storage tank deposited water recovery system is provided, which includes a dehydrogenation liquid storage tank, a crude styrene settling tank, connecting pipelines, an oil-water separation device, and a solid-liquid separation device. The dehydrogenation liquid storage tank is used to store dehydrogenation liquid and accumulated water at the bottom, providing a container for centralized storage of wastewater and materials. The crude styrene settling tank is used for oil-water separation. By setting up the oil-water separation device, the accumulated water at the bottom is separated from the oil, realizing the effective separation and recovery of oil and water. The connecting pipelines are used to connect the dehydrogenation liquid storage tank and the crude styrene settling tank, and transfer the accumulated water at the bottom from the storage tank to the settling tank. The oil-water separation device is used to separate the oil and water in the accumulated water at the bottom, separating the oil in the wastewater for subsequent treatment and recovery. The solid-liquid separation device is used to preliminarily separate solid particles from the accumulated water at the bottom, separating the suspended solids in the wastewater, reducing the load of subsequent treatment equipment, and improving the efficiency of the system.

[0032] Among them: The oil-water separation device includes an oil separator, a hydrocyclone, and a centrifuge, and the solid-liquid separation device includes a sedimentation tank and a filter.

[0033] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for recycling deposited water in a dehydrogenated liquid storage tank, characterized in that, It includes the following steps: System design: Connect a pipeline with an appropriate diameter and flow capacity to the drainage pipeline at the bottom of the dehydrogenated liquid storage tank and connect it to the top of the crude styrene settling tank; Oil-water separation: Install oil-water separation equipment such as oil separators and sedimentation tanks in the crude styrene settling tank for efficient oil-water separation. By adjusting the parameters of the oil-water separation equipment, maximize the quality and efficiency of the recycled water and materials; Wastewater pretreatment: Install solid-liquid separation equipment such as sedimentation tanks or filters before the bottom accumulated water enters the crude styrene settling tank to preliminarily treat suspended substances and reduce the content of solid particles in the wastewater; Material recovery: Customize the material recovery process. According to the characteristics of the waste and the properties of the target substance, use material recovery equipment for further separation and purification; Subsequent monitoring: Ensure the safety of the operation through leakage control devices and automatic monitoring systems, regularly monitor the effects of wastewater recovery and material recovery, and use water quality analysis to evaluate the efficiency of oil-water separation and material recovery.

2. The method for recycling the deposited water in the dehydrogenated liquid storage tank according to claim 1, characterized in that, The oil-water separation equipment includes an oil separator and a sedimentation tank.

3. The method for recycling the deposited water in the dehydrogenated liquid storage tank according to claim 1, characterized in that The solid-liquid separation equipment includes a sedimentation tank and a filter.

4. A dehydrogenated liquid storage tank sediment water recovery system, comprising a dehydrogenated liquid storage tank, a crude styrene sedimentation tank, connecting pipelines, an oil-water separation device, and a solid-liquid separation device, characterized in that, The dehydrogenated liquid storage tank is used to store dehydrogenated liquid and bottom accumulated water, providing a container for centralized storage of wastewater and materials; the crude styrene settling tank is used for oil-water separation. By installing oil-water separation equipment, separate the bottom accumulated water from the oil to achieve effective separation and recovery of oil and water; the connecting pipeline is used to connect the dehydrogenated liquid storage tank and the crude styrene settling tank and transfer the bottom accumulated water from the storage tank to the settling tank; the oil-water separation equipment is used to separate oil and water in the bottom accumulated water, separate the oil in the wastewater for subsequent treatment and recovery; the solid-liquid separation equipment is used to preliminarily separate solid particles from the bottom accumulated water, separate the suspended solids in the wastewater, reduce the load on subsequent treatment equipment, and improve the efficiency of the system.

5. The dehydrogenated liquid storage tank sediment water recovery system according to claim 4, characterized in that The oil-water separation equipment includes an oil separator, a hydrocyclone, and a centrifuge.

6. The dehydrogenation liquid storage tank sediment water recovery system according to claim 4, wherein The solid-liquid separation equipment includes a sedimentation tank and a filter.