A clean sewage recycling system for a coal-to-ethylene glycol production device

Abstract

This invention provides a clean wastewater recycling system for coal-to-ethylene glycol production plants. Through the integrated operation of a rainwater collection tank, pump components, water quality monitoring components, a central control system, water supply pipelines, and pipeline switching components, it achieves intelligent separation and treatment of rainwater, steam condensate, air-cooled spray water, and equipment flushing water. The rainwater collection tank serves as a centralized storage unit, ensuring the effective collection of various types of clean wastewater. The pump components provide stable water supply power, ensuring continuous system operation. The water quality monitoring components monitor water quality parameters in the tank in real time and feed the data back to the central control system. The central control system determines whether the water quality meets the reuse requirements of the circulating water system based on preset water quality standards and dynamically controls the operation of the pipeline switching components. This system changes the extensive mode of traditional technology, significantly reducing the load and operating costs of the wastewater treatment system while maximizing the recycling of reusable water resources.

Description

Technical Field

[0001] This utility model belongs to the technical field, specifically relating to a clean wastewater recycling system for coal-to-ethylene glycol production plants. Background Technology

[0002] Ethylene glycol is an important basic organic chemical raw material and fine chemical product. At room temperature, it is a colorless, odorless, sweet-tasting viscous liquid. Its main uses are in the production of polyester fibers (polyester), polyester resins, antifreeze, plasticizers, lubricants, surfactants, explosives, etc., and it is widely used in textiles, packaging, automobiles, energy, daily chemicals and many other fields.

[0003] Coal-to-ethylene glycol (CTO) is a common process for producing ethylene glycol, using coal as a raw material. It has experienced rapid development and large-scale industrialization in my country. During the operation of CTO plants, wastewater from various sources is inevitably generated. Besides process wastewater containing high concentrations of organic pollutants (such as gasification wastewater and process drainage from synthesis and hydrogenation sections), which requires specialized high-level wastewater treatment, there is also a relatively "clean" type of wastewater. This mainly includes collected rainwater, steam condensate, air-cooled spray water, and equipment flushing water. This wastewater is generally collected in rainwater collection ponds and then fed into a wastewater treatment system for further treatment.

[0004] However, since the water quality in these relatively "clean" wastewater is relatively good, and in the existing technology, regardless of its water quality, it is sent to the wastewater treatment system for treatment as wastewater, there are technical problems that significantly increase the load and operating cost of the wastewater treatment system, and also waste a lot of reusable water resources. Utility Model Content

[0005] To address the technical problem in the prior art where rainwater from collection ponds is treated as wastewater and sent to wastewater treatment systems regardless of its quality, which significantly increases the load and operating costs of wastewater treatment systems and wastes a large amount of reusable water resources, this invention provides a clean wastewater recycling system for coal-to-ethylene glycol production plants.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A clean wastewater recycling system for a coal-to-ethylene glycol production plant, the system comprising: a rainwater collection tank, a pump assembly, a water quality monitoring assembly, a central control assembly, a water transmission pipeline, and a pipeline switching assembly;

[0008] The rainwater collection pond is used to collect rainwater as well as steam condensate, air-cooled spray water and equipment flushing water from the coal-to-ethylene glycol production unit.

[0009] The water pump assembly is partially installed in the rainwater collection tank;

[0010] The water quality monitoring component is installed in the rainwater collection tank and is electrically connected to the central control component.

[0011] The pipeline switching component is installed on the water supply pipeline, dividing the water supply pipeline into an inlet end, a first outlet end, and a second outlet end.

[0012] The water inlet is connected to the water pump assembly, the first water outlet is connected to the circulating water system of the coal-to-ethylene glycol production unit, and the second water outlet is connected to the wastewater treatment system.

[0013] The central control component is electrically connected to the water quality monitoring component and the pipeline switching component.

[0014] Optionally, the pumping assembly includes two parallel water pumps, configured such that one is in use and the other is on standby.

[0015] Optionally, the water supply pipeline is a ground pipeline, which is fixed to the ground by multiple supports, and the multiple supports are spaced apart along the extension direction of the water supply pipeline.

[0016] Optionally, the support can be any one of a hanger, a U-shaped support, or a saddle-type support, and the distance between any two adjacent supports shall not exceed 6 meters.

[0017] Optionally, a manual valve is provided at the interface where the first water outlet is connected to the circulating water system, and / or at the interface where the second water outlet is connected to the wastewater treatment system.

[0018] Optionally, a check valve is also provided at the interface where the first outlet is connected to the circulating water system and / or at the interface where the second outlet is connected to the wastewater treatment system.

[0019] Optionally, the pipeline switching assembly is an electric three-way valve, a pneumatic three-way valve, or a valve group consisting of two switching valves.

[0020] Optionally, the central control component can be either a DCS system or a PLC system.

[0021] The beneficial effects of this utility model are:

[0022] This invention provides a clean wastewater recycling system for coal-to-ethylene glycol production plants. Through the integrated operation of a rainwater collection tank, pump components, water quality monitoring components, central control components, water supply pipelines, and pipeline switching components, it achieves intelligent separation and treatment of rainwater, steam condensate, air-cooled spray water, and equipment flushing water. The rainwater collection tank serves as a centralized storage unit, ensuring the effective collection of various types of clean wastewater. The pump components provide stable water supply power, ensuring continuous system operation. The water quality monitoring components monitor water quality parameters (such as turbidity, pH, and COD) in real time within the tank. The system automatically feeds data back to the central control unit. Based on preset water quality standards, the central control unit determines whether the water quality meets the requirements for reuse in the circulating water system and dynamically controls the pipeline switching components. When the water quality meets the standards, it switches to the first outlet, introducing water into the circulating water system for resource reuse. When the water quality does not meet the standards, it switches to the second outlet, introducing water into the wastewater treatment system to prevent pollution spread. This system changes the traditional, extensive model of "discharging all water into the wastewater system regardless of quality," significantly reducing the load and operating costs of the wastewater treatment system while maximizing the recycling of reusable water resources. Furthermore, the fully automated control reduces human intervention errors, improves system response speed and reliability, and provides coal chemical enterprises with a solution that combines environmental compliance and economic benefits. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a clean wastewater recycling system for a coal-to-ethylene glycol production plant, as described in this utility model.

[0024] The components include: 1. Rainwater collection tank; 2. Pumping assembly; 3. Water quality monitoring assembly; 4. Central control assembly; 5. Water supply pipeline; 51. Water inlet; 52. First water outlet; 53. Second water outlet; 6. Pipeline switching assembly; 7. Circulating water system; 8. Wastewater treatment system. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0028] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0029] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] See Figure 1 The diagram shows a clean wastewater recycling system for a coal-to-ethylene glycol production plant provided in this utility model. The system includes: a rainwater collection tank 1, a pump assembly 2, a water quality monitoring assembly 3, a central control assembly 4, a water transmission pipeline 5, and a pipeline switching assembly 6.

[0031] Rainwater collection tank 1 is used to collect rainwater as well as steam condensate, air-cooled spray water and equipment flushing water from the coal-to-ethylene glycol production unit.

[0032] Pump assembly 2 is installed in rainwater collection tank 1;

[0033] The water quality monitoring component 3 is installed in the rainwater collection tank 1 and is electrically connected to the central control component 4;

[0034] The pipeline switching component 6 is installed on the water supply pipeline 5, dividing the water supply pipeline 5 into an inlet end 51, a first outlet end 52, and a second outlet end 53.

[0035] The inlet end 51 is connected to the pump water assembly 2, the first outlet end 52 is connected to the circulating water system 7 of the coal-to-ethylene glycol production unit, and the second outlet end 53 is connected to the wastewater treatment system 8.

[0036] The central control component 4 is electrically connected to the water quality monitoring component 3 and the pipeline switching component 6.

[0037] In this embodiment, a clean wastewater recycling system for a coal-to-ethylene glycol production plant is provided. Through the integrated operation of a rainwater collection tank 1, a pump assembly 2, a water quality monitoring assembly 3, a central control assembly 4, a water supply pipeline 5, and a pipeline switching assembly 6, intelligent separation and treatment of rainwater, steam condensate, air-cooled spray water, and equipment flushing water is achieved. The rainwater collection tank 1 serves as a centralized storage unit, ensuring the effective collection of various types of clean wastewater. The pump assembly 2 provides stable water supply power, ensuring continuous system operation. The water quality monitoring assembly 3 monitors water quality parameters (such as turbidity and pH value) in the tank in real time. The system feeds the data back to the central control component 4. Based on preset water quality standards, the central control component 4 determines whether the water quality meets the requirements for reuse in the circulating water system and dynamically controls the pipeline switching component 6. When the water quality meets the standards, it switches to the first outlet 52, introducing water into the circulating water system 7 for resource reuse. When the water quality does not meet the standards, it switches to the second outlet 53, introducing water into the wastewater treatment system 8 to prevent pollution spread. This system changes the traditional, extensive model of "discharging all water into the wastewater system regardless of quality," significantly reducing the load and operating costs of the wastewater treatment system while maximizing the recycling of reusable water resources. Furthermore, the fully automated control reduces human intervention errors, improves system response speed and reliability, and provides coal chemical enterprises with a solution that combines environmental compliance and economic benefits.

[0038] Furthermore, the water quality judgment standard in this utility model is determined according to the water quality of the national standard "Design Code for Industrial Circulating Cooling Water Treatment" GB50050-2017, which requires at least the measurement of pH, COD (Chemical Oxygen Demand), turbidity, conductivity, and chloride ion value of the water.

[0039] Furthermore, the water quality monitoring component in this invention uses an online water quality analyzer.

[0040] Optionally, the water pump assembly 2 in this utility model includes two parallel water pumps, configured such that one is in use and the other is on standby.

[0041] In this embodiment, the use of redundancy design significantly improves the system's operational stability and resilience: when a pump fails or requires maintenance, a backup pump can be started immediately to ensure that the wastewater in the rainwater collection tank 1 can be continuously transported to the subsequent treatment stages, avoiding tank overflow or system shutdown due to pump failure; at the same time, the parallel dual-pump structure shares the continuous workload of a single device, extending the service life of the pump and reducing the frequency of failures caused by equipment overload; in addition, the backup pump configuration facilitates the implementation of a rotating operation strategy, ensuring even distribution of equipment wear, reducing unplanned downtime for maintenance, and guaranteeing the continuous and efficient operation of the clean wastewater recovery process in the coal-to-ethylene glycol production unit, especially adapting to the stringent requirements for equipment reliability in coal chemical production scenarios.

[0042] Furthermore, the water pump is connected to the interior of the rainwater collection tank 1 via a pipe, and a removable filter screen is installed at the inlet of the pipe.

[0043] Optionally, the water supply pipeline 5 in this utility model is a ground pipeline and is fixed to the ground by multiple supports, which are spaced apart along the extension direction of the water supply pipeline 5.

[0044] In this embodiment, the leakage risk that is prone to occur in traditional underground pipe wells is avoided, and the environmental pollution problem caused by sewage seeping into the soil or groundwater is eliminated. At the same time, the ground laying method makes the pipeline fully exposed within the visible range, which makes it easy for inspection personnel to quickly locate leak points, blockages or corrosion problems, significantly reducing the difficulty of daily maintenance and repair costs. The support fixation enhances the pipeline's pressure resistance and seismic resistance, preventing pipeline deformation or breakage caused by foundation settlement or external impact. In addition, the ground pipeline does not require excavation construction, and the installation and modification cycle is short, which is especially suitable for technical transformation projects in existing coal chemical plant areas, significantly improving the system deployment efficiency.

[0045] Optionally, the bracket in this utility model can be any one of a hanger, a U-shaped bracket, or a saddle-type bracket, and the distance between any two adjacent brackets shall not exceed 6 meters.

[0046] Optionally, a manual valve is provided at the interface where the first water outlet 52 is connected to the circulating water system 7 and / or at the interface where the second water outlet 53 is connected to the wastewater treatment system 8.

[0047] Optionally, a check valve is also provided at the interface where the first water outlet 52 is connected to the circulating water system 7 and / or at the interface where the second water outlet 53 is connected to the wastewater treatment system 8.

[0048] In this embodiment, a manual valve and a check valve are installed at the interface of the first outlet 52 and / or the second outlet 53. The manual valve allows operators to manually cut off the pipeline during system commissioning, emergencies, or planned maintenance, achieving physical isolation from the circulating water system or wastewater treatment system, avoiding cross-contamination or backflow of media during maintenance, and ensuring the independent and safe operation of the associated systems. The check valve, through its unidirectional flow characteristic, allows water to flow only from the water supply pipeline 5 to the target system (circulating water system or wastewater treatment system), preventing backflow from impacting the pump water assembly 2 or contaminating the already qualified water body due to pressure fluctuations. The combination of the two valves forms a redundant sealing barrier, which not only enhances the reliability of the interface sealing but also provides flexible operating space for flow regulation. It is especially suitable for high-pressure, multi-impurity media in coal chemical plants, significantly reducing the risk of system shutdown caused by valve failure and improving the overall process safety and controllability.

[0049] Optionally, the pipeline switching component 6 in this utility model is an electric three-way valve, a pneumatic three-way valve, or a valve group consisting of two switching valves.

[0050] Specifically, when the valve group consists of two switching valves, the two switching valves are respectively installed on the first outlet end 52 and the second outlet end 53.

[0051] In this embodiment, the electric / pneumatic three-way valve uses a single actuator to drive the valve core to rotate or move, achieving rapid switching between the inlet and two outlet ends. It features fast response, good sealing, and its opening degree can be controlled by signals from the central control component, making it suitable for highly automated scenarios. Alternatively, a valve group consisting of two on / off valves can achieve flow diversion by independently controlling the opening and closing of each valve. This design is simple in structure, has low maintenance costs, and provides physical isolation redundancy, ensuring that a failure in one valve does not affect the function of the other flow path. Both forms can execute commands from the central control component, ensuring seamless switching to the circulating water system when water quality meets standards and immediate transfer to the wastewater system when standards are not met, preventing mixed flow or accidental discharge.

[0052] Optionally, the central control component 4 in this utility model can be either a DCS system or a PLC system.

[0053] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0054] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A clean wastewater recycling system for a coal-to-ethylene glycol production plant, characterized in that, include: Rainwater collection tank (1), pump assembly (2), water quality monitoring assembly (3), central control assembly (4), water transmission pipeline (5) and pipeline switching assembly (6); The rainwater collection tank (1) is used to collect rainwater as well as steam condensate, air-cooled spray water and equipment flushing water from the coal-to-ethylene glycol production unit; The pump assembly (2) is partially disposed in the rainwater collection tank (1); The water quality monitoring component (3) is installed in the rainwater collection tank (1) and is electrically connected to the central control component (4); The pipeline switching component (6) is installed on the water supply pipeline (5) and divides the water supply pipeline (5) into an inlet end (51), a first outlet end (52), and a second outlet end (53); The water inlet (51) is connected to the water pump assembly (2), the first water outlet (52) is connected to the circulating water system (7) of the coal-to-ethylene glycol production unit, and the second water outlet (53) is connected to the wastewater treatment system (8). The central control component (4) is electrically connected to the water quality monitoring component (3) and the pipeline switching component (6).

2. The clean wastewater recycling system for a coal-to-ethylene glycol production plant according to claim 1, characterized in that, The pump assembly (2) includes two parallel water pumps, configured such that one is in use and the other is on standby.

3. The clean wastewater recycling system for a coal-to-ethylene glycol production plant according to claim 1, characterized in that, The water supply pipeline (5) is a ground pipeline, which is fixed to the ground by multiple supports. The multiple supports are spaced apart along the extension direction of the water supply pipeline (5).

4. The clean wastewater recycling system for a coal-to-ethylene glycol production plant according to claim 3, characterized in that, The support can be any one of a hanger, a U-shaped support, or a saddle-type support, and the distance between any two adjacent supports shall not exceed 6 meters.

5. The clean wastewater recovery and utilization system for a coal-to-ethylene glycol production plant according to any one of claims 1 to 4, characterized in that, A manual valve is provided at the interface where the first water outlet (52) is connected to the circulating water system (7) and / or at the interface where the second water outlet (53) is connected to the wastewater treatment system (8).

6. The clean wastewater recycling system for a coal-to-ethylene glycol production plant according to claim 5, characterized in that, A check valve is also provided at the interface where the first outlet (52) is connected to the circulating water system (7) and / or at the interface where the second outlet (53) is connected to the wastewater treatment system (8).

7. The clean wastewater recycling system for a coal-to-ethylene glycol production plant according to claim 1, characterized in that, The pipeline switching assembly (6) is an electric three-way valve, a pneumatic three-way valve, or a valve group consisting of two switching valves.

8. The clean wastewater recycling system for a coal-to-ethylene glycol production plant according to claim 1, characterized in that, The central control component (4) is either a DCS system or a PLC system.

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