Coal gasification system based on coal gasification fine slag powder conveying

Abstract

The present application provides a coal gasification system based on coal gasification fine slag powder conveying, and relates to the technical field of coal gasification systems, which comprises: an entrained-flow bed gasification furnace for converting coal powder into crude coal gas; a washing unit connected with the entrained-flow bed gasification furnace for washing and dedusting the crude coal gas, separating clean crude synthesis gas and ash water containing fine slag powder, and sending the separated clean crude synthesis gas to a subsequent processing unit; an ash water treatment unit connected with the washing unit for multi-stage flash evaporation and sedimentation of the ash water, and sending the ash water after sedimentation to a filter press to form filter cake; and a conveying unit comprising a belt conveyor, wherein a material distribution mechanism is arranged at the feeding end of the belt conveyor, and the material distribution mechanism is located directly below the outlet of the filter press to uniformly distribute the filter cake formed by the filter press on the belt conveyor.

Description

Technical Field

[0001] This invention relates to the field of coal gasification system technology, and more specifically, to a coal gasification system based on the conveying of fine coal gasification slag powder. Background Technology

[0002] Coal gasification is a clean conversion process that involves reacting solid coal with a gasifying agent (air, oxygen, water vapor, carbon dioxide, etc.) under certain temperature and pressure conditions to convert solid coal into crude syngas (coal gas). It is a core technology for the clean and efficient utilization of coal.

[0003] During the coal gasification process, the converted crude syngas contains a large amount of fine coal slag powder, which needs to be separated by a washing unit. The clean crude syngas after separation is sent to the subsequent processing unit, while the separated fine coal slag powder forms ash water. The ash water undergoes multi-stage flash evaporation and sedimentation, and after sedimentation, it is sent to a filter press to form filter cake. The filter cake is then transported to the raw material silo for temporary storage via a belt conveyor. However, when the filter cake is sent to the belt conveyor, there is a problem of large impact force on the belt conveyor and poor uniformity of filter cake distribution on the belt conveyor, which leads to local abnormal wear of the belt. This requires frequent belt repairs and may even cause the belt to be scrapped. Summary of the Invention

[0004] The present invention aims to solve the problems of filter cake having a large impact on the belt conveyor and uneven distribution on the belt conveyor leading to abnormal belt wear.

[0005] To address the above problems, this invention provides a coal gasification system based on the conveying of fine coal gasification slag powder, comprising: Fluidized bed gasifier is used to convert pulverized coal into crude coal gas; The washing unit is connected to the fluidized bed gasifier and is used to wash and remove dust from the crude coal gas, and separate clean crude syngas and ash water containing fine slag powder. The separated clean crude syngas is sent to the subsequent processing unit. The grey water treatment unit is connected to the washing unit and is used to perform multi-stage flash evaporation and sedimentation on grey water, and after sedimentation, it is sent to a filter press to make filter cake. The conveying unit includes a belt conveyor, and the feed end of the belt conveyor is provided with a feeding mechanism. The feeding mechanism is located directly below the outlet of the filter press to evenly distribute the filter cake produced by the filter press on the belt conveyor.

[0006] The present invention provides a coal gasification system based on the conveying of fine coal gasification slag powder, which, compared with the prior art, has the following beneficial effects, but is not limited to: The filter cake produced by the filter press first falls onto the feeding mechanism, which evenly distributes the filter cake onto the belt conveyor for transport. Simultaneously, the feeding mechanism buffers the filter cake during the feeding process, reducing its impact on the belt conveyor. This design reduces the impact of the filter cake on the belt conveyor while improving the uniformity of its distribution. It solves the problem of abnormal belt wear caused by the large impact of the filter cake on the belt conveyor and its uneven distribution in existing technologies, thus avoiding frequent belt maintenance.

[0007] Furthermore, the material distribution mechanism includes a hopper positioned directly above the belt conveyor, the hopper having an inlet and an outlet, a material distribution roller rotatably disposed inside the hopper, and a plurality of material distribution plates evenly distributed circumferentially on the roller surface of the material distribution roller, each material distribution plate including a mounting portion fixed to the roller surface of the material distribution roller, a movable portion hinged to the mounting portion, and a spring piece disposed between the movable portion and the material distribution roller.

[0008] Furthermore, the spring is a metal elastic element, the spring is hook-shaped, the hook end of the spring is fixed to the movable part, and the other end of the spring is fixed to the fabric roller.

[0009] Furthermore, a first baffle plate is provided inside the hopper on the side of the cloth roller away from the discharge port. The first baffle plate is inclined and its lower end is directly opposite the cloth roller.

[0010] Furthermore, the hopper is provided with a guide plate at the discharge port, the guide plate is inclined, and the lower end of the guide plate is positioned directly opposite the belt conveyor.

[0011] Furthermore, when the fabric roller drives the fabric plate to rotate, the upper end of the guide plate is located on the rotation path of the outer edge of the movable part.

[0012] Furthermore, a scraper is provided on the outside of the hopper, and the lower end of the scraper is spaced from the belt conveyor.

[0013] Furthermore, the upper end of the scraper is hinged to the hopper, a telescopic rod is hinged to the hopper, the lower end of the telescopic rod is hinged to the lower middle part of the scraper, and a spring is sleeved on the telescopic rod.

[0014] Furthermore, the lower end of the hopper is provided with a second outlet, which is directly opposite the belt conveyor.

[0015] Furthermore, the hopper is provided with a second baffle plate at the second outlet, the lower end of the second baffle plate is in contact with the belt conveyor, and a receiving box is provided at the lower part of the side of the second baffle plate away from the material outlet. Attached Figure Description

[0016] Figure 1 This is a structural block diagram of the coal gasification system of this application; Figure 2 This is a schematic diagram of the overall structure of the conveying unit in this application; Figure 3 This is a schematic diagram of the internal structure of the conveying unit in this application; Figure 4 This is a schematic diagram of the internal structure of the hopper in this application; Figure 5 This is a schematic diagram of the structure of the fabric roller in this application.

[0017] Explanation of reference numerals in the attached figures: 1. Fluidized bed gasifier; 2. Washing unit; 3. Ash water treatment unit; 4. Conveying unit; 41. Belt conveyor; 42. Material feeding mechanism; 421. Hopper; 422. Material feeding roller; 423. Material feeding plate; 424. Spring; 425. First baffle plate; 426. Guide plate; 427. Scraper plate; 428. Telescopic rod; 429. Spring; 410. Second baffle plate; 401. Receiving box; 4211. Feed inlet; 4212. Discharge outlet; 4213. Second outlet; 4231. Mounting part; 4232. Moving part. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, specific embodiments of this application are described clearly and completely below with reference to the accompanying drawings. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0019] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," "comprise," etc., in the specification, claims, and accompanying drawings of this application are open-ended terms. They indicate that a method comprises one or more steps, or an apparatus comprises one or more elements, but do not exclude the inclusion of other steps or elements. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0023] See Figure 1 An embodiment of the present invention provides a coal gasification system based on the conveying of fine coal gasification slag powder, comprising: Fluidized bed gasifier 1 is used to convert pulverized coal into crude coal gas; Washing unit 2 is connected to fluidized bed gasifier 1 and is used to wash and remove dust from crude coal gas and separate clean crude syngas and ash water containing fine slag powder. The separated clean crude syngas is sent to the subsequent processing unit. The grey water treatment unit 3 is connected to the washing unit 2 and is used to perform multi-stage flash evaporation and sedimentation on the grey water, and after sedimentation, it is sent to the filter press to make filter cake. The conveying unit 4 includes a belt conveyor 41. The feed end of the belt conveyor 41 is provided with a feeding mechanism 42. The feeding mechanism 42 is located directly below the outlet of the filter press to evenly distribute the filter cake produced by the filter press on the belt conveyor 41.

[0024] In the prior art, the filter cake does not fall continuously and evenly in the hopper 421. Instead, due to overlapping, adhesion and other reasons, sometimes less filter cake falls, and sometimes a larger clump falls. On the one hand, this causes uneven distribution of the filter cake on the belt conveyor 41 and abnormal local stress on the belt. On the other hand, the large clump of filter cake falling has a greater impact on the belt and is prone to impact damage.

[0025] In this embodiment, the filter cake produced by the filter press first falls onto the feeding mechanism 42, which then evenly distributes the filter cake onto the belt conveyor 41 for transport. Simultaneously, the feeding mechanism 42 buffers the filter cake during the feeding process, reducing the impact of the filter cake on the belt conveyor 41. This design reduces the impact of the filter cake on the belt conveyor 41 while improving the uniformity of the filter cake's distribution on the belt conveyor 41. This solves the problem of abnormal belt wear caused by the large impact of the filter cake on the belt conveyor 41 and the uneven distribution of the filter cake on the belt conveyor 41 in the prior art, thus avoiding frequent belt maintenance.

[0026] Furthermore, referring to Figures 2 to 5 The material feeding mechanism 42 includes a hopper 421 located directly above the belt conveyor 41. The hopper 421 has an inlet 4211 and an outlet 4212. A material feeding roller 422 is rotatably mounted inside the hopper 421. Multiple material feeding plates 423 are evenly distributed along the circumferential direction on the roller surface of the material feeding roller 422. Each material feeding plate 423 includes a mounting part 4231 fixed to the roller surface of the material feeding roller 422. A movable part 4232 is hinged to the mounting part 4231. A spring piece 424 is provided between the movable part 4232 and the material feeding roller 422.

[0027] In this embodiment, the width direction of both the cloth roller 422 and the cloth plate 423 is consistent with the width direction of the belt. Assuming the conveying direction along the belt conveyor 41 is forward, the discharge port 4212 is located at the lower front side of the cloth roller 422, and the feed port 4211 is located at the upper part of the cloth roller 422. The movable part 4232 of the cloth plate 423 is hinged to the rear end of the mounting part 4231, and along the direction gradually moving away from the mounting part 4231, the movable part 4232 is gradually inclined away from the cloth roller 422. Specifically, the cloth feeding process for the filter cake is as follows: the filter cake falling from the feed port 4211 lands on the cloth roller 422, and the distance between two adjacent cloth plates 423 is equivalent to a... As the cloth roller 422 rotates, the filter cake in each compartment falls onto the belt conveyor 41 through the discharge port 4212. When a larger clump of filter cake falls onto the cloth roller 422 from the feed port 4211, the movable part 4232 of the cloth plate 423 moves towards the spring plate 424 due to the impact of the filter cake and gravity. This causes a larger portion of the filter cake in the current compartment to fall from the side of the movable part 4232 away from the cloth roller 422 to the adjacent compartment behind, making the amount of filter cake in each compartment relatively uniform. This improves the uniformity of the filter cakes falling onto the belt conveyor 41. At the same time, the cushioning effect of the cloth plate 423 also reduces the impact force of the subsequent filter cakes on the belt.

[0028] Furthermore, referring to Figure 5 The spring 424 is a metal elastic element. The spring 424 is hook-shaped. The hook end of the spring 424 is fixed on the movable part 4232, and the other end of the spring 424 is fixed on the fabric roller 422.

[0029] In this embodiment, the spring sheet 424 is specifically made of metal elastic element, such as elastic steel sheet. The spring sheet 424 has a hook-shaped design and good deformation and resilience. At least one spring sheet 424 is provided at each fabric plate 423, and the specific number is selected according to the usage requirements.

[0030] Furthermore, referring to Figure 3 and Figure 4 Inside the hopper 421, on the side of the cloth roller 422 away from the discharge port 4212, a first baffle plate 425 is provided. The first baffle plate 425 is inclined and the lower end of the first baffle plate 425 is positioned directly opposite the cloth plate 423.

[0031] In this embodiment, the first baffle plate 425 is specifically located at the upper-middle position behind the cloth roller 422, and is used to block and guide the filter cake falling from the side of the movable part 4232 away from the cloth roller 422 into the rear material grid.

[0032] Furthermore, referring to Figure 3 and Figure 4The hopper 421 is provided with a guide plate 426 at the discharge port 4212. The guide plate 426 is inclined and the lower end of the guide plate 426 is directly facing the belt conveyor 41.

[0033] In this embodiment, the guide plate 426 is specifically located behind the feed inlet and is located in front of the lower side of the feed roller. It receives the filter cake falling from the feed grid as the feed roller 422 rotates and guides the filter cake onto the belt conveyor 41.

[0034] Furthermore, referring to Figure 4 When the fabric roller 422 drives the fabric plate 423 to rotate, the upper end of the guide plate 426 is on the rotation path of the outer edge of the movable part 4232.

[0035] In this embodiment, the upper end of the guide plate 426 being on the rotation path of the outer edge of the movable part 4232 means that when the movable part 4232 rotates with the cloth roller 422, the end of the movable part 4232 away from the cloth roller 422 will contact and be blocked by the guide plate 426. The specific length of the blocked end of the movable part 4232 away from the cloth roller 422 can be 0.5-1cm. When the movable part 4232 is blocked by the guide plate 426, the movable part 4232 is squeezed and rotates relative to the mounting part 4231, thereby avoiding and turning past the guide plate 426. After the movable part 4232 turns past and leaves the guide plate 426, due to the recovery of the elasticity of the spring piece 424, the movable part 4232 is pushed back to its original position. In this process, it is equivalent to forming a vibration on the movable part 4232, which helps to shake off the filter cake adhering to the movable part 4232.

[0036] Furthermore, referring to Figures 2 to 4 A scraper 427 is provided on the outside of the hopper 421, and there is a gap between the lower end of the scraper 427 and the belt conveyor 41.

[0037] In this embodiment, after the filter cake in each cell falls onto the belt conveyor 41 in sequence, the filter cake is scraped flat by the scraper plate 427, which further improves the uniformity of the filter cake distribution on the belt conveyor 41.

[0038] Furthermore, referring to Figure 3 and Figure 4 The upper end of the scraper 427 is hinged to the hopper 421. A telescopic rod 428 is hinged to the hopper 421. The lower end of the telescopic rod 428 is hinged to the lower middle part of the scraper 427. A spring 429 is sleeved on the telescopic rod 428.

[0039] In this embodiment, as in the prior art, the telescopic rod 428 has two sides, and a spring 429 is provided between the two sides. When the telescopic rod 428 retracts, the spring 429 is compressed, causing the telescopic rod 428 to open and return to its original position. By setting the telescopic rod 428, when encountering a large or numerous filter cake that cannot be scraped flat, the scraper plate 427 can rotate relative to the hopper 421 to avoid damage to the scraper plate 427 and filter cake jamming.

[0040] Furthermore, referring to Figures 2 to 4 The lower end of the hopper 421 is also provided with a second outlet 4213, which is directly opposite the belt conveyor 41.

[0041] In this embodiment, some filter cakes may fall below the hopper 421 due to gaps between components and movement deviation. The filter cakes that fall below the hopper 421 are discharged onto the belt conveyor 41 through the second outlet 4213.

[0042] Furthermore, referring to Figures 1 to 4 The hopper 421 is provided with a second baffle plate 410 at the second outlet 4213. The lower end of the second baffle plate 410 is in contact with the belt conveyor 41. A receiving box 401 is provided on the lower part of the side of the second baffle plate 410 away from the material outlet.

[0043] In this embodiment, the second baffle plate 410 is disposed on the rear side of the second outlet 4213. The lower end of the second baffle plate 410 contacts the belt conveyor 41, specifically the belt. On the one hand, it prevents the filter cake from falling out of the belt end. On the other hand, the contact between the second baffle plate 410 and the belt is equivalent to the action of a scraper, scraping off the mud-like material adhering to the belt and reducing the problem of material sticking during subsequent conveying.

[0044] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A coal gasification system based on the conveying of fine coal gasification slag powder, characterized in that, include: A fluidized bed gasifier (1) is used to convert pulverized coal into crude coal gas. Washing unit (2), which is connected to fluidized bed gasifier (1), is used to wash and remove dust from crude coal gas and separate clean crude syngas and ash water containing fine slag powder. The separated clean crude syngas is sent to the subsequent processing unit. Grey water treatment unit (3), which is connected to washing unit (2), is used to perform multi-stage flash evaporation and sedimentation on grey water, and after sedimentation, it is sent to a filter press to form filter cake; The conveying unit (4) includes a belt conveyor (41). The feed end of the belt conveyor (41) is provided with a cloth spreading mechanism (42). The cloth spreading mechanism (42) is located directly below the outlet of the filter press to evenly spread the filter cake made by the filter press on the belt conveyor (41).

2. The coal gasification system based on the conveying of fine coal gasification slag powder according to claim 1, characterized in that, The fabric feeding mechanism (42) includes a hopper (421) located at the top of the belt conveyor (41). The hopper (421) is provided with an inlet (4211) and an outlet (4212). A fabric feeding roller (422) is rotatably arranged inside the hopper (421). Multiple fabric feeding plates (423) are evenly distributed on the roller surface of the fabric feeding roller (422) along the circumferential direction. The fabric feeding plate (423) includes a mounting part (4231) fixed to the roller surface of the fabric feeding roller (422). A movable part (4232) is hinged to the mounting part (4231). A spring piece (424) is provided between the movable part (4232) and the fabric feeding roller (422).

3. A coal gasification system based on the conveying of fine coal gasification slag powder according to claim 2, characterized in that, The spring (424) is a metal elastic element. The spring (424) is hook-shaped. The hook end of the spring (424) is fixed on the movable part (4232), and the other end of the spring (424) is fixed on the fabric roller (422).

4. A coal gasification system based on the conveying of fine coal gasification slag powder according to claim 2, characterized in that, Inside the hopper (421), a first baffle plate (425) is provided on the side of the cloth roller (422) away from the discharge port (4212). The first baffle plate (425) is inclined and the lower end of the first baffle plate (425) is positioned directly opposite the cloth plate (423).

5. A coal gasification system based on the conveying of fine coal gasification slag powder according to claim 2, characterized in that, The hopper (421) is provided with a guide plate (426) at the discharge port (4212). The guide plate (426) is inclined and the lower end of the guide plate (426) is positioned directly opposite the belt conveyor (41).

6. A coal gasification system based on the conveying of fine coal gasification slag powder according to claim 5, characterized in that, When the fabric roller (422) drives the fabric plate (423) to rotate, the upper end of the guide plate (426) is on the rotation path of the outer edge of the movable part (4232).

7. A coal gasification system based on the conveying of fine coal gasification slag powder according to claim 2, characterized in that, The hopper (421) is provided with a scraper (427) on its outside, and the lower end of the scraper (427) is spaced from the belt conveyor (41).

8. A coal gasification system based on the conveying of fine coal gasification slag powder according to claim 7, characterized in that, The upper end of the scraper (427) is hinged to the hopper (421), and a telescopic rod (428) is hinged to the hopper (421). The lower end of the telescopic rod (428) is hinged to the lower middle part of the scraper (427), and a spring (429) is sleeved on the telescopic rod (428).

9. A coal gasification system based on the conveying of fine coal gasification slag powder according to claim 2, characterized in that, The lower end of the hopper (421) is also provided with a second outlet (4213), which is directly opposite the belt conveyor (41).

10. A coal gasification system based on the conveying of fine coal gasification slag powder according to claim 9, characterized in that, The hopper (421) is provided with a second baffle plate (410) at the second outlet (4213). The lower end of the second baffle plate (410) is in contact with the belt conveyor (41). A receiving box (401) is provided on the lower part of the side of the second baffle plate (410) away from the material outlet.

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