A petroleum coke gasification device

Abstract

An embodiment of the present invention provides a petroleum coke gasification device, comprising: a pressurizing and conveying unit for pressurizing and conveying powdered petroleum coke; a fine ash circulation unit connected to the pressurizing and conveying unit for receiving a portion of the powdered petroleum coke conveyed by the pressurizing and conveying unit; and a gasification unit connected to the pressurizing and conveying unit for receiving a portion of the powdered petroleum coke conveyed by the pressurizing and conveying unit and gasifying the portion of the powdered petroleum coke to generate synthesis gas. The gasification unit is further connected to the fine ash circulation unit so that fine ash carried away by the synthesis gas enters the fine ash circulation unit. The powdered petroleum coke and fine ash in the fine ash circulation unit are treated and then re-enter the gasification unit for gasification, thereby improving the carbon conversion rate of the petroleum coke. The petroleum coke gasification device provided by the present invention can improve the carbon conversion rate of the petroleum coke by allowing the fine ash carried away by the synthesis gas to be recycled through the fine ash circulation unit.

Description

Technical Field

[0001] The present invention relates to the technical field of petroleum coke gasification, in particular to a petroleum coke gasification device. Background Art

[0002] Petroleum coke is a solid byproduct produced by the coking unit in refineries. Since the beginning of this century, my country's refinery crude oil processing capacity has increased rapidly, with coking capacity increasing even faster. Consequently, petroleum coke production has surged rapidly. Over the past decade (2001-2011), national petroleum coke production increased 2.6-fold, and refinery petroleum coke yield (as a percentage of crude oil processing) has risen from 2.15% to approximately 4%. With the continuous growth of global oil demand and the increasing heaviness of crude oil, petroleum coke production has increased dramatically. my country's dependence on foreign oil has risen from 52% in 2005 to nearly 70% in 2017. High-sulfur crude oil predominates in imported oil, resulting in an increasing proportion of high-sulfur petroleum coke in my country's petroleum coke production. High-sulfur petroleum coke is primarily used for combustion in power generation. However, due to its high sulfur content, combustion produces large amounts of SO2 acidic gas, which is difficult to handle. Furthermore, with increasing environmental regulations on air pollution emissions, coupled with the large amount of waste residue produced after combustion, the search for more effective petroleum coke processing technologies has been a hot topic in recent years. Gasifying petroleum coke to produce natural gas is a promising industrial development strategy. Specifically, the process utilizes dry entrained-flow gasification technology to process the petroleum coke. This technology uses dry feed and, under high temperature and high pressure, completes the drying, volatilization, cracking, combustion, and gasification processes in a very short time. The sulfur in the high-sulfur petroleum coke can be converted to H2S and ultimately elemental sulfur using gasification technology. Furthermore, during the gasification reaction, the gasifying agent CO2 is converted into gases such as CO and H2, which can be used for chemical synthesis, power generation, and city gas. This process produces no environmental pollutants, making it a clean, mainstream process. However, the existing dry entrained-flow gasification technology for petroleum coke processing suffers from a low carbon conversion rate of approximately 80% to 95%, which has hindered the widespread application of petroleum coke gasification. Summary of the Invention

[0003] The present invention provides a petroleum coke gasification device. The petroleum coke gasification device provided by the present invention is provided with a fine ash circulation unit, which allows fine ash carried over by synthesis gas to be recycled through the fine ash circulation unit. This can, on the one hand, improve the carbon conversion rate of petroleum coke, facilitate the promotion of petroleum coke gasification, and provide a better solution for petroleum coke. On the other hand, it can reduce fine ash emissions, which is beneficial to environmental protection.

[0004] In order to solve the above technical problems, the embodiments of the present invention provide the following technical solutions:

[0005] A petroleum coke gasification device, comprising:

[0006] A pressurizing and conveying unit, which is used to pressurize and convey powdered petroleum coke;

[0007] a fine ash circulation unit connected to the pressurizing and conveying unit and configured to receive a portion of the powdered petroleum coke conveyed by the pressurizing and conveying unit;

[0008] a gasification unit connected to the pressurizing and conveying unit, configured to receive a portion of the powdered petroleum coke conveyed by the pressurizing and conveying unit and gasify the powdered petroleum coke to generate synthesis gas;

[0009] In which, the gasification unit is also connected to the fine ash circulation unit so that the fine ash brought out by the synthesis gas enters the fine ash circulation unit, and the powdered petroleum coke and fine ash in the fine ash circulation unit are processed and then enter the gasification unit again for gasification to improve the carbon conversion rate of the petroleum coke.

[0010] Preferably, the fine ash circulation unit comprises a fine ash collection tank, a fine ash lock hopper and a fine ash feeding tank connected in sequence, wherein:

[0011] The fine ash collection tank is connected to the pressurizing and conveying unit and the gasification unit respectively, so as to collect the powdered petroleum coke and fine ash, and to deliver the collected powdered petroleum coke and fine ash into the fine ash lock hopper;

[0012] The fine ash lock hopper is used to pressurize the powdered petroleum coke and fine ash placed therein and transport them to the fine ash feeding tank;

[0013] The fine ash feeding tank is connected to the gasification unit and is used to feed the pressurized powdered petroleum coke and fine ash into the gasification unit again for gasification.

[0014] Preferably, the petroleum coke gasification device further comprises a grinding unit connected to the pressurizing and conveying unit. The petroleum coke is ground by the grinding unit to form powdered petroleum coke, and the powdered petroleum coke enters the pressurizing and conveying unit.

[0015] Preferably, the petroleum coke gasification device further comprises a drying unit connected to the pressurizing and conveying unit, and the powdered petroleum coke enters the pressurizing and conveying unit after being dried by the drying unit.

[0016] Preferably, the petroleum coke gasification device further comprises a washing unit connected to the gasification unit for washing the synthesis gas generated by the gasification unit.

[0017] Preferably, the petroleum coke gasification device further comprises an ash treatment unit, which is connected to the gasification unit, and the ash generated by the gasification unit enters the ash treatment unit for further treatment.

[0018] Preferably, the petroleum coke gasification device further comprises a grey water treatment unit connected to the washing unit, and the grey water generated by the washing unit enters the grey water treatment unit for further treatment.

[0019] Preferably, the ratio of the powdered petroleum coke entering the fine ash circulation unit to the powdered petroleum coke entering the gasification unit is 1:(3-5).

[0020] Preferably, the powdered petroleum coke and fine ash in the fine ash circulation unit are processed and then re-enter the gasification unit from the top burner of the gasification unit for gasification; or

[0021] The powdered petroleum coke and fine ash in the fine ash circulation unit are processed and then re-enter the gasification unit through the side burner of the gasification unit for gasification; or,

[0022] The powdered petroleum coke and fine ash in the fine ash circulation unit are processed and then re-enter the gasification unit through the top burner and the side burner of the gasification unit for gasification.

[0023] Preferably, the grey water treatment unit performs flash evaporation, sedimentation and deoxygenation treatment on the grey water in sequence.

[0024] Based on the disclosure of the above embodiments, it can be seen that the embodiments of the present invention have the following beneficial effects:

[0025] The petroleum coke gasification device provided in the present invention is equipped with a fine ash circulation unit, so that the fine ash brought out by the synthesis gas can be recycled through the fine ash circulation unit. On the one hand, this can improve the carbon conversion rate of petroleum coke, which is conducive to the promotion of petroleum coke gasification and provides a better solution for petroleum coke. On the other hand, it can reduce the emission of fine ash, which is beneficial to environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic structural diagram of a first petroleum coke gasification device provided in an embodiment of the present invention;

[0027] Figure 2 A schematic structural diagram of a fine ash circulation unit provided in an embodiment of the present invention;

[0028] Figure 3 A schematic structural diagram of a second petroleum coke gasification device provided in an embodiment of the present invention;

[0029] Figure 4A schematic structural diagram of a third petroleum coke gasification device provided in an embodiment of the present invention;

[0030] Figure 5 A schematic structural diagram of a fourth petroleum coke gasification device provided in an embodiment of the present invention;

[0031] Among them, 1-pressurization and conveying unit, 2-gasification unit, E-fine ash circulation unit, E1-fine ash collection tank, E2-fine ash lock hopper, E3-fine ash feeding tank, A1-first grinding and drying unit, B1-second grinding and drying unit, A2-first pressurization and conveying unit, A3-first gasification and synthesis gas washing unit, A4-first slag and ash water treatment unit, C1-third grinding and drying unit, B2-second pressurization and conveying unit, B3-second gasification and synthesis gas washing unit, B4-second slag and ash water treatment unit, D1-fourth grinding and drying unit, C2-third pressurization and conveying unit, C3-third gasification and synthesis gas washing unit, C4-third slag and ash water treatment unit. DETAILED DESCRIPTION

[0032] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings, but are not intended to limit the present invention.

[0033] It should be understood that various modifications may be made to the embodiments disclosed herein. Therefore, the above description should not be considered as limiting, but merely as an example of an embodiment. Other modifications within the scope and spirit of the present disclosure will occur to those skilled in the art.

[0034] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the general description of the present disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the present disclosure.

[0035] These and other characteristics of the invention will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0036] It should also be understood that although the invention has been described with reference to certain specific examples, those skilled in the art will be able to realize many other equivalent forms of the invention that have the characteristics recited in the claims and are therefore within the scope of protection defined thereby.

[0037] The above and other aspects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0038] Specific embodiments of the present disclosure will be described hereinafter with reference to the accompanying drawings; however, it should be understood that the disclosed embodiments are merely examples of the present disclosure, which may be implemented in a variety of ways. Well-known and / or repetitive functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant detail. Therefore, the specific structural and functional details disclosed herein are not intended to be limiting, but rather serve merely as a basis and representative basis for the claims to teach those skilled in the art to variously employ the present disclosure with substantially any suitable detailed structure.

[0039] This description may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," each of which may refer to one or more of the same or different embodiments according to the present disclosure.

[0040] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0041] like Figure 1 As shown, one embodiment of the present invention provides a petroleum coke gasification device, the petroleum coke gasification device comprising:

[0042] A pressurizing and conveying unit 1, which is used to pressurize and convey the powdered petroleum coke;

[0043] a fine ash circulation unit E, connected to the pressurizing and conveying unit 1, for receiving a portion of the powdered petroleum coke conveyed by the pressurizing and conveying unit 1;

[0044] a gasification unit 2 connected to the pressurizing and conveying unit 1, configured to receive a portion of the powdered petroleum coke conveyed by the pressurizing and conveying unit 1, and gasify the powdered petroleum coke to generate synthesis gas;

[0045] In which, the gasification unit 2 is also connected to the fine ash circulation unit E, so that the fine ash brought out by the synthesis gas enters the fine ash circulation unit E, and the powdered petroleum coke and fine ash in the fine ash circulation unit E are processed and then enter the gasification unit 2 again for gasification to improve the carbon conversion rate of the petroleum coke.

[0046] In this embodiment, the pressurizing and conveying unit 1 pressurizes the powdered petroleum coke therein and conveys a portion of the pressurized powdered petroleum coke to the gasification unit 2 and a portion to the fine ash circulation unit E. In the present invention, there is no particular limitation on the ratio of the powdered petroleum coke entering the gasification unit 2 and the fine ash circulation unit E, as long as it can ensure that a portion of the pressurized powdered petroleum coke is conveyed to the gasification unit 2 for gasification and a portion enters the fine ash circulation unit E. In a preferred embodiment, the ratio of the powdered petroleum coke entering the fine ash circulation unit E to the powdered petroleum coke entering the gasification unit 2 is 1:(3-5). Furthermore, the ratio of the powdered petroleum coke entering the fine ash circulation unit E to the powdered petroleum coke entering the gasification unit 2 is 1:3. That is, the powdered petroleum coke output from the pressurizing and conveying unit 1 is divided equally into four portions, three of which enter the gasification unit 2 for further gasification and one enters the fine ash circulation unit E.

[0047] Continue as Figure 1 As shown, the powdered petroleum coke entering the gasification unit 2 is gasified in the gasification unit 2 to form synthesis gas, which mainly contains H2 and CO. When the synthesis gas escapes, it carries fine ash, which is then Figure 1 The path 11 shown in FIG. 1 enters the fine ash circulation unit E, where the powdered petroleum coke and fine ash are processed and then pass through the fine ash circulation unit E again. Figure 1 The path 12 shown in the figure enters the gasification unit 2 for gasification to improve the carbon conversion rate of the petroleum coke. Experiments have shown that using the device provided by the present invention to gasify the petroleum coke can achieve a carbon conversion rate of up to 99%.

[0048] In one embodiment, the gasification unit 2 may be, for example, a gasifier having a top burner and a side burner; the powdered petroleum coke and fine ash in the fine ash circulation unit E are processed and then re-enter the gasification unit 2 from the top burner of the gasification unit 2 for gasification; or,

[0049] The powdered petroleum coke and fine ash in the fine ash circulation unit E are processed and then re-enter the gasification unit 2 from the side burner of the gasification unit 2 for gasification; or,

[0050] The powdered petroleum coke and fine ash in the fine ash circulation unit E are processed and then re-enter the gasification unit 2 from the top burner and the side burner of the gasification unit 2 for gasification.

[0051] The petroleum coke gasification device provided in the present invention is equipped with a fine ash circulation unit E, so that the fine ash brought out by the synthesis gas can be recycled through the fine ash circulation unit E. On the one hand, this can improve the carbon conversion rate of petroleum coke, which is conducive to the promotion of petroleum coke gasification and provides a better solution for petroleum coke. On the other hand, it can reduce the emission of fine ash, which is beneficial to environmental protection.

[0052] like Figure 2 As shown, in one embodiment provided by the present invention, the fine ash circulation unit E includes a fine ash collection tank E1, a fine ash lock hopper E2 and a fine ash feeding tank E3 connected in sequence, wherein,

[0053] The fine ash collection tank E1 is connected to the pressurizing and conveying unit 1 and the gasification unit 2 respectively, so as to collect the powdered petroleum coke and fine ash, and send the collected powdered petroleum coke and fine ash into the fine ash lock hopper E2;

[0054] The fine ash lock hopper E2 is used to pressurize the powdered petroleum coke and fine ash placed therein and transport them to the fine ash feeding tank E3;

[0055] The fine ash feeding tank E3 is connected to the gasification unit 2 and is used to feed the pressurized powdered petroleum coke and fine ash into the gasification unit 2 again for gasification.

[0056] In this embodiment, the fine ash collection tank E1 is connected to the pressurizing and conveying unit 1 and the gasification unit 2, respectively, and is used to collect a portion of the powdered petroleum coke in the pressurizing and conveying unit 1 and the fine ash in the gasification unit 2. The powdered petroleum coke and fine ash in the fine ash collection tank E1 enter the fine ash lock hopper E2 for pressurization. In this embodiment, there is no limitation on the specific structure of the fine ash lock hopper E2, as long as it can pressurize the powdered petroleum coke and fine ash. After being pressurized in the fine ash lock hopper E2, the powdered petroleum coke and fine ash enter the fine ash feeding tank E3, which feeds the powdered petroleum coke and fine ash into the gasification unit 2, where they are further gasified.

[0057] In another embodiment provided by the present invention, the petroleum coke gasification apparatus further comprises a grinding unit connected to the pressurizing and conveying unit 1. The petroleum coke is ground by the grinding unit to form powdered petroleum coke, which then enters the pressurizing and conveying unit 1. In this embodiment, the grinding unit grinds the petroleum coke into powdered petroleum coke before feeding it into the pressurizing and conveying unit 1, which pressurizes and conveys the powdered petroleum coke. In a preferred embodiment, the grinding unit grinds the petroleum coke into powdered petroleum coke, and only powdered petroleum coke with a particle size that meets certain requirements can enter the pressurizing and conveying unit 1.

[0058] In another embodiment of the present invention, the petroleum coke gasification apparatus further comprises a drying unit connected to the pressurizing and conveying unit 1, wherein the powdered petroleum coke is dried by the drying unit before entering the pressurizing and conveying unit 1. In this embodiment, the drying unit first dries the powdered petroleum coke, and then the dried powdered petroleum coke enters the pressurizing and conveying unit 1. In another embodiment of the present invention, the petroleum coke may first enter the grinding unit for grinding, and then, after being ground into powdered petroleum coke, enter the drying unit, and after being dried by the drying unit, enter the pressurizing and conveying unit 1.

[0059] In another embodiment provided by the present invention, the petroleum coke gasification device further includes a washing unit, which is connected to the gasification unit 2 and is used to wash the synthesis gas generated by the gasification unit 2.

[0060] In other embodiments provided by the present invention, the petroleum coke gasification device further includes an ash treatment unit, which is connected to the gasification unit 2, and the ash generated by the gasification unit 2 enters the ash treatment unit for further treatment.

[0061] In one embodiment of the present invention, the petroleum coke gasification apparatus further comprises a gray water treatment unit connected to the scrubbing unit, wherein the gray water generated by the scrubbing unit enters the gray water treatment unit for further treatment. In a preferred embodiment, the gray water treatment unit sequentially performs flash evaporation, sedimentation, and deoxygenation on the gray water.

[0062] In a specific embodiment of the present invention, Figure 3 As shown, the grinding unit and the drying unit are combined into one unit, which is a grinding and drying unit. In this embodiment, there are two grinding and drying units, namely a first grinding and drying unit A1 and a second grinding and drying unit B1; the gasification unit 2 and the washing unit are combined into one unit, which is a first gasification and synthesis gas washing unit A3, that is, the first gasification and synthesis gas washing unit A3 contains two modules, namely a first gasification module and a first washing module; the ash treatment unit and the gray water treatment unit are combined into one unit, which is a first ash and gray water treatment unit A4, that is, the first ash and gray water treatment unit A4 includes two modules, namely a first ash treatment module and a first gray water treatment module, wherein the first ash treatment module is connected to the first gasification module, and the first gray water treatment module is connected to the first washing module.

[0063] Continue as Figure 3As shown, the first grinding and drying unit A1 and / or the second grinding and drying unit B1 transports the powdered petroleum coke to the first pressurizing and conveying unit A2. Four pipelines are provided at the outlet of the first pressurizing and conveying unit A2, three of which are sent to the three side burners corresponding to the first gasification module included in the first gasification and synthesis gas washing unit A3, and the fourth pipeline is sent to the fine ash circulation unit E. The fine ash collection tank E1 in the fine ash circulation unit E receives the fine ash filtered out by the first gasification module in the first gasification and synthesis gas washing unit A3 through the pipeline 61. The fine ash lock hopper E2 increases the pressure of the powdered petroleum coke and fine ash therein and sends them to the fine ash feeding tank E3. The fine ash feeding tank E3 is provided with two cones, which are continuously transported to the fourth side burner and top burner corresponding to the first gasification module included in the first gasification and synthesis gas washing unit A3 through pipelines 14 and 51 respectively. The first slag and ash water treatment unit A4 is connected to the first gasification and synthesis gas washing unit A3 to treat the ash and ash water generated in the gasification process and the washing process, thereby realizing the recycling of fine ash, improving the carbon conversion rate, and reducing the emission of fine ash to protect the environment.

[0064] like Figure 4 As shown, in this embodiment, multiple grinding and drying units, pressurizing and conveying units 1, gasification and synthesis gas washing units and slag and ash water treatment units can be set up at the same time. Figure 4 As shown, the first grinding and drying unit A1 and / or the second grinding and drying unit B1 transports powdered petroleum coke to the first pressurizing and conveying unit A2. Four pipelines are provided at the outlet of the first pressurizing and conveying unit A2, three of which are supplied to the three side burners corresponding to the first gasification module included in the first gasification and syngas scrubbing unit A3, and the fourth pipeline is supplied to the fine ash circulation unit E. The second grinding and drying unit B1 and / or the third grinding and drying unit C1 transports powdered petroleum coke to the second pressurizing and conveying unit B2. The second pressurizing and conveying unit B2 is provided with four pipelines, which are respectively supplied to the four side burners corresponding to the second gasification module included in the second gasification and syngas scrubbing unit B3.

[0065] The fine ash collection tank E1 in the fine ash circulation unit E receives the fine ash filtered out by the first gasification module in the first gasification and synthesis gas washing unit A3 through the pipeline 61, and receives the fine ash filtered out by the second gasification module in the second gasification and synthesis gas washing unit B3 through the pipeline 62. The fine ash lock hopper E2 increases the pressure of the powdered petroleum coke and fine ash therein and sends them to the fine ash feeding tank E3. The fine ash feeding tank E3 is provided with three cones, which are continuously transported to the fourth side burner and top burner corresponding to the first gasification module included in the first gasification and synthesis gas washing unit A3 through the pipeline 14 and the pipeline 51 respectively, and are continuously transported to the top burner corresponding to the second gasification module included in the second gasification and synthesis gas washing unit B3 through the pipeline 52. The first slag and ash water treatment unit A4 is connected to the first gasification and synthesis gas washing unit A3 to treat the ash and ash water generated during the gasification process and the washing process. The second slag and ash water treatment unit B4 is connected to the second gasification and synthesis gas washing unit B3 to treat the ash and ash water generated during the gasification process and the washing process, thereby realizing the recycling of fine ash, improving the carbon conversion rate, and reducing the emission of fine ash to protect the environment.

[0066] like Figure 5 As shown, in this embodiment, multiple grinding and drying units, pressurizing and conveying units 1, gasification and synthesis gas washing units and slag and ash water treatment units can be set up at the same time. Figure 5 As shown, the first grinding and drying unit A1 and / or the second grinding and drying unit B1 transports pulverized petroleum coke to the first pressurizing and conveying unit A2. Four pipelines are installed at the outlet of the first pressurizing and conveying unit A2, three of which are supplied to the three side burners corresponding to the first gasification module of the first gasification and syngas scrubbing unit A3, and the fourth pipeline is supplied to the fine ash circulation unit E. The second grinding and drying unit B1 and / or the third grinding and drying unit C1 transports pulverized petroleum coke to the second pressurizing and conveying unit B2. Four pipelines are installed in the second pressurizing and conveying unit B2, which are supplied to the four side burners corresponding to the second gasification module of the second gasification and syngas scrubbing unit B3. The third grinding and drying unit C1 and / or the fourth grinding and drying unit D1 transports pulverized petroleum coke to the third pressurizing and conveying unit C2. Four pipelines are installed in the third pressurizing and conveying unit C2, which are supplied to the four side burners corresponding to the third gasification module of the third gasification and syngas scrubbing unit C3.

[0067] The fine ash collection tank E1 in the fine ash circulation unit E receives the fine ash filtered out by the first gasification module in the first gasification and synthesis gas washing unit A3 through the pipeline 61, receives the fine ash filtered out by the second gasification module in the second gasification and synthesis gas washing unit B3 through the pipeline 62, and receives the fine ash filtered out by the third gasification module in the third gasification and synthesis gas washing unit C3 through the pipeline 63. The fine ash lock hopper E2 increases the pressure of the powdered petroleum coke and fine ash therein and sends them to the fine ash feeding tank E3. The fine ash feeding tank E3 is provided with four cones, which are continuously transported to the fourth side burner and top burner corresponding to the first gasification module included in the first gasification and synthesis gas washing unit A3 through the pipeline 14 and the pipeline 51 respectively, and are continuously transported to the top burner corresponding to the second gasification module included in the second gasification and synthesis gas washing unit B3 through the pipeline 52, and are continuously transported to the top burner corresponding to the third gasification module included in the third gasification and synthesis gas washing unit C3 through the pipeline 53. The first slag and ash water treatment unit A4 is connected to the first gasification and synthesis gas washing unit A3 to treat the ash and ash water generated in the gasification process and the washing process. The second slag and ash water treatment unit B4 is connected to the second gasification and synthesis gas washing unit B3 to treat the ash and ash water generated in the gasification process and the washing process. The third slag and ash water treatment unit C4 is connected to the third gasification and synthesis gas washing unit C3 to treat the ash and ash water generated in the gasification process and the washing process, thereby realizing the recycling of fine ash, improving the carbon conversion rate, and reducing the emission of fine ash to protect the environment.

[0068] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the scope of the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the spirit and scope of protection of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the present invention.

Claims

1. A petroleum coke gasification device, characterized in that: The petroleum coke gasification device includes: A pressurizing and conveying unit, which is used to pressurize and convey powdered petroleum coke; a fine ash circulation unit connected to the pressurizing and conveying unit and configured to receive a portion of the powdered petroleum coke conveyed by the pressurizing and conveying unit; a gasification unit connected to the pressurizing and conveying unit, configured to receive a portion of the powdered petroleum coke conveyed by the pressurizing and conveying unit and gasify the powdered petroleum coke to generate synthesis gas; The gasification unit is further connected to the fine ash circulation unit, so that the fine ash carried out by the synthesis gas enters the fine ash circulation unit, and the powdered petroleum coke and fine ash in the fine ash circulation unit are processed and then enter the gasification unit again for gasification to improve the carbon conversion rate of the petroleum coke; Wherein, the ratio of the powdered petroleum coke entering the fine ash circulation unit to the powdered petroleum coke entering the gasification unit is 1:(3-5); The fine ash circulation unit includes a fine ash collection tank, a fine ash lock hopper and a fine ash feeding tank connected in sequence, wherein: The fine ash collection tank is connected to the pressurizing and conveying unit and the gasification unit respectively, so as to collect the powdered petroleum coke and fine ash, and to deliver the collected powdered petroleum coke and fine ash into the fine ash lock hopper; The fine ash lock hopper is used to pressurize the powdered petroleum coke and fine ash placed therein and transport them to the fine ash feeding tank; The fine ash feeding tank is connected to the gasification unit and is used to feed the pressurized powdered petroleum coke and fine ash into the gasification unit again for gasification; The petroleum coke gasification device further comprises a grinding unit connected to the pressurizing and conveying unit. The petroleum coke is ground by the grinding unit to form powdered petroleum coke, and the powdered petroleum coke enters the pressurizing and conveying unit.

2. The petroleum coke gasification device according to claim 1, characterized in that: The petroleum coke gasification device further comprises a drying unit connected to the pressurizing and conveying unit. The powdered petroleum coke enters the pressurizing and conveying unit after being dried by the drying unit.

3. The petroleum coke gasification device according to claim 1, characterized in that: The petroleum coke gasification device further includes a washing unit connected to the gasification unit for washing the synthesis gas generated by the gasification unit.

4. The petroleum coke gasification device according to claim 1, characterized in that: The petroleum coke gasification device further comprises an ash treatment unit connected to the gasification unit. Ash generated by the gasification unit enters the ash treatment unit for further treatment.

5. The petroleum coke gasification device according to claim 3, characterized in that: The petroleum coke gasification device further includes a grey water treatment unit connected to the washing unit. Grey water generated by the washing unit enters the grey water treatment unit for further treatment.

6. The petroleum coke gasification device according to claim 1, characterized in that: The powdered petroleum coke and fine ash in the fine ash circulation unit are processed and then re-enter the gasification unit from the top burner of the gasification unit for gasification; or, The powdered petroleum coke and fine ash in the fine ash circulation unit are processed and then re-enter the gasification unit through the side burner of the gasification unit for gasification; or, The powdered petroleum coke and fine ash in the fine ash circulation unit are processed and then re-enter the gasification unit through the top burner and the side burner of the gasification unit for gasification.

7. The petroleum coke gasification device according to claim 5, characterized in that: The grey water treatment unit sequentially performs flash evaporation, sedimentation and deoxygenation treatment on the grey water.

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