System for efficient resource utilization of waste

Abstract

The utility model provides a system for efficiently recycling wastes, which comprises a first reaction device, a first electrolysis device, a second electrolysis device and a methanol-to-olefin device which are in fluid communication in sequence, and the first reaction device is in fluid communication with the second electrolysis device. The methanol-to-olefin device is in fluid communication with the first electrolysis device through a carbon dioxide recovery pipeline. According to the system for efficiently recycling the wastes, zero carbon emission can be realized by recycling carbon dioxide generated by each device, and the yield of products with high economic added values, such as ethylene, propylene and the like, is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste recycling and system preparation, and in particular to a system for efficiently resource-utilizing waste. Background Art

[0002] At present, the main methods of plastic disposal are landfill and incineration. Landfill will cause the infiltration of plastic waste liquid, destroy soil properties, and occupy land resources. Incineration will produce a large amount of greenhouse gases and release harmful gases such as dioxins, which is a serious waste of resources. Therefore, the means of waste plastic disposal have gradually shifted from landfill and incineration to resource utilization mainly based on physical recycling and chemical recycling.

[0003] In addition to waste plastics, waste materials such as biomass, domestic garbage and various waste oils and waste oils also face the same situation as waste plastics, that is, the total amount of waste is large and the recycling rate is low. For example, the residual oil hydrogenation technology used to treat residual oil has problems such as large investment and high maintenance costs.

[0004] The applicant disclosed a method for recycling waste plastics through green oil technology in a Chinese invention patent with publication number "CN111750358B" and title "A waste plastic green oil technology embedded in a waste incineration method", which mainly includes the following steps: separating the dry and wet waste to obtain dry waste containing waste plastics and non-plastic waste; liquefying and catalytically cracking the waste plastics in the dry waste to obtain high-temperature oil gas and waste residue under the action of a catalyst; and burning the non-plastic waste and waste residue as fuel. However, in the prior art, when recycling waste plastics, carbon dioxide cannot be effectively recycled and utilized, which increases carbon emissions in the chemical recycling process of waste plastics.

[0005] Therefore, a new technology is urgently needed to solve the above problems. Utility Model Content

[0006] To make up for the deficiencies of the prior art, the present application provides a system for efficient resource utilization of waste. The system for efficient resource utilization of waste can achieve zero carbon emissions by recycling and reusing the carbon dioxide generated by each device, and increase the yield of high economic value-added products such as ethylene and propylene.

[0007] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions.

[0008] In the first aspect, the present application provides a system for efficient resource utilization of waste, which includes a first reaction device, a first electrolysis device, a second electrolysis device and a methanol to olefins device which are fluidly connected in sequence, the first reaction device and the second electrolysis device are fluidly connected, and the methanol to olefins device is fluidly connected to the first electrolysis device through a carbon dioxide recovery pipeline. In this embodiment, the first reaction device is used to convert the raw material into synthesis gas and carbon dioxide. The first electrolysis device is used to convert carbon dioxide into synthesis gas. The second electrolysis device is used to convert synthesis gas into methanol. The methanol to olefins device converts methanol into light olefins.

[0009] Preferably, the first reaction device is a gasifier.

[0010] Preferably, the system for efficient resource utilization of waste further comprises a separation device, and the separation device is fluidically connected to the methanol to olefins device.

[0011] Preferably, the separation device is fluidically connected to the first reaction device for conveying the separated C4 and above components to the first reaction device.

[0012] Preferably, the methanol to olefins unit is fluidically connected to the first reaction unit for conveying components above C4 in the product of the methanol to olefins unit to the first reaction unit.

[0013] Preferably, the first electrolysis device and / or the second electrolysis device is a normal temperature and pressure electrolysis device.

[0014] Preferably, a catalyst inlet is provided on the first electrolysis device and / or the second electrolysis device.

[0015] Preferably, the methanol to olefins unit comprises a gasifier and a fluidized bed reactor in fluid communication with the gasifier.

[0016] Preferably, the raw materials include biomass, domestic garbage, waste plastics and various waste oils.

[0017] Preferably, the system for efficient resource utilization of waste also includes a cutting device for crushing the raw materials into a size of 2*2mm to 20*20mm.

[0018] Compared with the prior art, the beneficial effects of this application are as follows:

[0019] Firstly, the system for efficient resource utilization of waste provided by the utility model recovers the carbon dioxide generated by the methanol to olefins device and / or the methanol to olefins device to the first electrolysis device for reuse by setting a carbon dioxide recovery pipeline. The first electrolysis device has low carbon emissions, achieving zero carbon emissions for the entire system;

[0020] Secondly, this system for efficient resource utilization of waste produces high economic value-added products such as ethylene and propylene by setting up a methanol to olefins unit. The entire system has high production capacity and good economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present application may be better understood by describing the embodiments of the present application in conjunction with the accompanying drawings, in which:

[0022] Figure 1 This is a schematic diagram of the structure of a system for efficient resource utilization of waste in one embodiment of the present application.

[0023] Description of Figure Numbers:

[0024] 1. First reaction device; 2. First electrolysis device; 3. Second electrolysis device; 4. MTO device; 5. Separation device; 101. Carbon dioxide delivery pipeline; 102. First synthesis gas delivery pipeline; 201. Second synthesis gas delivery pipeline; 301. Methanol delivery pipeline; 401. MTO device outlet pipeline; 402. Carbon dioxide recovery pipeline; 501. Separation outlet pipeline; 502. Separation recovery pipeline. DETAILED DESCRIPTION

[0025] Unless otherwise defined, the technical terms or scientific terms used in this specification and claims shall have the common meanings understood by persons having ordinary skills in the technical field to which the present invention belongs.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "fluid connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be direct fluid communication, or indirect fluid communication through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] This embodiment relates to a Figure 1 The system shown here is a system for efficient resource utilization of waste.

[0031] refer to Figure 1 The system for efficient resource utilization of waste includes a first reaction device 1, a first electrolysis device 2, a second electrolysis device 3 and a methanol to olefins device 4 which are fluidically connected in sequence, and the first reaction device 1 is fluidically connected to the second electrolysis device 3. The methanol to olefins device 4 is fluidically connected to the first electrolysis device 2 through a carbon dioxide recovery pipeline 402. The first reaction device 1 can be a gasifier. In some embodiments, the first reaction device 1 is fluidically connected to the methanol to olefins device 4.

[0032] In some embodiments, the first electrolysis device 2 can use CO2 and H2O as raw materials to generate synthesis gas. The second electrolysis device 3 can use the synthesis gas to produce methanol. Methanol is sent to the methanol to olefins device 4 to prepare light olefins. This method generates less CH4 and can improve the productivity of olefins. The methanol to olefins device 4 can use MTO technology. The raw materials may include biomass, domestic garbage, waste plastics and various waste oils.

[0033] The following briefly describes the operation method of the system for efficient resource utilization of waste by taking biomass, domestic garbage, waste plastics and various waste oils as the raw materials of the first reaction device 1 as an example.

[0034] Biomass, domestic garbage, waste plastics and various waste oils are used as raw materials, and after corresponding pretreatment such as heating and pressure increase, they are sent to the first reaction device 1, i.e., the gasifier.

[0035] In the gasifier, the above raw materials react with pure oxygen to generate CO+H2 (syngas for short) and CO2. After CO2 is separated, it flows into the first electrolysis device 2 through the carbon dioxide delivery pipeline 101, and the syngas flows into the second electrolysis device 3 through the first syngas delivery pipeline 102. The first electrolysis device 2 converts CO2 into syngas and delivers the syngas to the second electrolysis device 3 through the second syngas delivery pipeline 201.

[0036] The second electrolysis device 3 can convert the synthesis gas into methanol. Subsequently, the methanol is transported to the methanol to olefins device 4 through the methanol transport pipeline 301.

[0037] The source of CO2 for the first electrolysis device 2 may also include CO2 produced by treating non-condensable gas and coke in oil refining and coal chemical industry.

[0038] In some embodiments, the methanol to olefins unit 4 includes a gasifier and a fluidized bed reactor in fluid communication with the gasifier. In the present application, the process of converting methanol to olefins using a fluidized bed reactor is not particularly limited.

[0039] In some embodiments, the system for efficient resource utilization of waste further includes a separation device 5, which is fluidically connected to the methanol to olefins device 4 through the methanol to olefins device outlet pipeline 401. The separation device 5 is used to further separate the product of the methanol to olefins device 4 to obtain C4 and above components and ethylene and / or propylene, and to transport the separated C4 and above components to the first reaction device 1 and / or the methanol to olefins device 4. Figure 1 In the illustrated embodiment, the separation device 5 discharges ethylene and / or propylene through the separation outlet pipe 501 , and transports the fractions above C4 components to the first reaction device 1 through the separation recovery pipe 502 .

[0040] In some embodiments, the first electrolysis device 2 and / or the second electrolysis device 3 are normal temperature and pressure electrolysis devices. In some embodiments, the first electrolysis device 2 and / or the second electrolysis device 3 may be provided with a catalyst inlet for adding a catalyst suitable for the respective reaction.

[0041] In some embodiments, the system for efficient resource utilization of waste further includes a cutting device, which is fluidically connected to the first reaction device 1. The cutting device is used to perform corresponding pretreatments such as cutting on the raw materials and feed them into the first reaction device 1. For example, when waste plastics are used as raw materials, they need to undergo pretreatment operations such as crushing and iron removal, and the crushing range can generally be between 2*2mm and 20*20mm.

[0042] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A system for efficient resource utilization of waste, characterized in that: The system for efficient resource utilization of waste comprises a first reaction device, a first electrolysis device, a second electrolysis device and a methanol-to-olefins device which are fluidically connected in sequence, the first reaction device is fluidically connected to the second electrolysis device, and the methanol-to-olefins device is fluidically connected to the first electrolysis device through a carbon dioxide recovery pipeline; Wherein, the first reaction device is used to convert the raw material into synthesis gas and carbon dioxide; Wherein, the first electrolysis device is used to convert carbon dioxide into synthesis gas; Wherein, the second electrolysis device is used to convert synthesis gas into methanol.

2. The system for efficient resource utilization of waste according to claim 1, characterized in that: The first reaction device is a gasifier.

3. The system for efficient resource utilization of waste according to claim 1, characterized in that: The system for efficient resource utilization of waste further includes a separation device, which is fluidically connected to the methanol to olefins device.

4. The system for efficient resource utilization of waste according to claim 3 is characterized in that: The separation device is fluidically connected to the first reaction device and is used to transport the separated C4 and above components to the first reaction device.

5. The system for efficient resource utilization of waste according to claim 1, characterized in that: The methanol to olefins unit is fluidically connected to the first reaction unit and is used to transport components above C4 in the product of the methanol to olefins unit to the first reaction unit.

6. The system for efficient resource utilization of waste according to claim 1, characterized in that: The first electrolysis device and / or the second electrolysis device are normal temperature and pressure electrolysis devices.

7. The system for efficient resource utilization of waste according to claim 6, characterized in that: The first electrolysis device and / or the second electrolysis device is provided with a catalyst inlet.

8. The system for efficient resource utilization of waste according to claim 1, characterized in that: The methanol to olefins device comprises a gasifier and a fluidized bed reactor in fluid communication with the gasifier.

9. The system for efficient resource utilization of waste according to any one of claims 1 to 8, characterized in that: The raw materials include one or more of biomass, domestic garbage, waste plastics and various waste oils.

10. The system for efficient resource utilization of waste according to any one of claims 1 to 8, characterized in that: The system for efficiently recycling waste also includes a cutting device for crushing the raw materials into sizes ranging from 2*2mm to 20*20mm.

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