Flow stabilizing device in gasification furnace

Abstract

A liquid pool used for containing pulverized coal is arranged on the lower section of a furnace cavity of the gasification furnace, an outlet is formed in the upper section of the furnace cavity of the gasification furnace, an isolation wall connected between the upper section and the lower section is further arranged in the gasification furnace, and the flow stabilizing device comprises an equal-diameter ascending pipe which is made of high-temperature-resistant alloy steel and integrally keeps a drift diameter, the lower part of the equal-diameter ascending pipe is inserted into the liquid pool, the outer wall of the equal-diameter ascending pipe is connected with the inner wall of the gasification furnace in a supporting manner, and the upper end of the equal-diameter ascending pipe and the isolation wall are arranged at intervals; the middle pipes are cylindrical and are arranged on the inner side of the equal-diameter ascending pipe at intervals in the radial direction, the upper ends of the middle pipes are connected with the communicating holes in the isolation wall in a sealed mode, and the upper ends of the middle pipes and the upper end of the equal-diameter ascending pipe are arranged at intervals; and the support connecting structure is used for realizing stable connection between the middle pipe and the inner wall of the gasification furnace.

Description

Technical Field

[0001] This disclosure generally relates to the field of gasifier technology. More specifically, this disclosure relates to a flow stabilizing device within a gasifier. Background Technology

[0002] In aerospace pulverized coal gasification furnace technology, the riser pipe, as a key channel for syngas output, directly impacts gasification efficiency and operational stability through its structural design. The riser pipe typically employs a variable-diameter design. This structure features a larger diameter at the bottom, expanding upwards to a smaller diameter, forming a funnel-shaped channel. The initial intention of this design was to reduce airflow velocity through cross-sectional changes, promoting gas-liquid separation and minimizing water droplet and ash entrainment. However, the transition area between diameters easily forms flow dead zones, leading to ash accumulation. Particularly at the diameter change location, the altered airflow direction makes it easier for solid particles to adhere to the pipe wall. With prolonged operation, ash accumulation worsens, the flow cross-section decreases, system resistance increases, and frequent shutdowns for cleaning are required.

[0003] In view of this, there is an urgent need to provide a flow stabilizing device inside the gasifier so that the internal airflow of the flow stabilizing device inside the gasifier is smoother and the cleaning pressure is reduced. Summary of the Invention

[0004] In order to at least address one or more of the technical problems mentioned above, this disclosure proposes a flow stabilizing device in a gasifier.

[0005] A flow stabilizing device for a gasifier includes a liquid pool for containing pulverized coal in the lower section of the gasifier's furnace cavity and an outlet in the upper section. An isolation wall connecting the upper and lower sections is also provided within the gasifier. The device comprises: a constant-diameter riser pipe made of high-temperature resistant alloy steel, maintaining a uniform diameter from bottom inlet to top outlet, with its lower part inserted into the liquid pool and its outer wall supported by the inner wall of the gasifier; its upper end spaced apart from the isolation wall; a cylindrical intermediate pipe, radially spaced inside the constant-diameter riser pipe, with its upper end sealed to a connecting hole on the isolation wall, and its upper end spaced apart from the upper end of the constant-diameter riser pipe; and a supporting connection structure for achieving a stable connection between the intermediate pipe and the inner wall of the gasifier.

[0006] In some embodiments, the wall of the equal-diameter riser pipe is provided with a communication hole that communicates with the furnace cavity.

[0007] In some embodiments, a control valve is provided on the connecting hole.

[0008] In some embodiments, the supporting connection structure is a connecting rod, and the intermediate pipe is supported and connected to the inner wall of the gasifier through the connecting rod.

[0009] In some embodiments, the connecting rod is connected to the inner wall of the gasifier by welding.

[0010] In some embodiments, the lower and upper sections of the intermediate tube are respectively provided with multiple connecting rods.

[0011] In some embodiments, the isolation wall is configured as a cone shape.

[0012] In some embodiments, a filter screen is provided at the lower end of the intermediate tube.

[0013] In some embodiments, an overflow hole is also provided on the wall of the equal-diameter riser pipe.

[0014] By using the gasifier flow stabilization device provided above, the embodiments disclosed herein, through the installation of the gasifier flow stabilization device, which, through the fixed equal-diameter riser pipe, intermediate pipe and supporting connection structure inside the furnace, can make the internal airflow of the gasifier flow stabilization device smoother and reduce cleaning pressure. Attached Figure Description

[0015] The above and other objects, features, and advantages of exemplary embodiments of this disclosure will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this disclosure are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0016] Figure 1 An exemplary cross-sectional view of a flow stabilizing device in a gasifier according to some embodiments of this disclosure is shown. Detailed Implementation

[0017] The technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, not all of them. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0018] It should be understood that the terms “comprising” and “including” used in this disclosure and claims indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0019] It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure. As used in this disclosure and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this disclosure and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0020] As used in this specification and claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0021] This disclosure provides a flow stabilizing device inside a gasifier. By using a constant-diameter riser pipe, an intermediate pipe, and a supporting connection structure fixed inside the gasifier, the internal airflow of the flow stabilizing device can be made smoother, reducing cleaning pressure.

[0022] The specific embodiments disclosed herein will now be described in detail with reference to the accompanying drawings.

[0023] Figure 1 An exemplary cross-sectional view of a flow stabilizing device in a gasifier according to some embodiments of this disclosure is shown.

[0024] A flow stabilizing device for a gasifier includes a liquid pool for containing pulverized coal in the lower section of the gasifier's furnace cavity and an outlet in the upper section. An isolation wall connecting the upper and lower sections is also provided within the gasifier. The device comprises: a constant-diameter riser pipe 1, made of high-temperature resistant alloy steel, maintaining a uniform diameter from bottom inlet to top outlet, with its lower part inserted into the liquid pool and its outer wall supported by the inner wall of the gasifier; its upper end spaced apart from the isolation wall; an intermediate pipe 3, cylindrical in shape, radially spaced inside the constant-diameter riser pipe 1, with its upper end sealed to a connecting hole 4 on the isolation wall, and its upper end spaced apart from the upper end of the constant-diameter riser pipe 1; and a supporting connection structure 5 for achieving a stable connection between the intermediate pipe 3 and the inner wall of the gasifier.

[0025] The uniform diameter of the constant-diameter riser 1 breaks away from traditional variable-diameter designs, eliminating abrupt changes in the flow field. The gap between the upper end of the constant-diameter riser 1 and the isolation wall is designed to reserve space for airflow. The intermediate pipe 3 is cylindrical, adaptable to the airflow trajectory, and forms a double-layer flow guiding structure by being radially spaced inside the constant-diameter riser 1. The sealed connection between the upper end of the intermediate pipe 3 and the communication hole 4 in the isolation wall prevents syngas leakage. The supporting connection structure 5, while fixing the intermediate pipe 3, also counteracts the force of airflow impact on the intermediate pipe 3, ensuring long-term stable operation of the intermediate pipe 3. Thus, the structure of this flow stabilization device in the gasifier achieves uniform airflow distribution, reduces pressure fluctuations, and is simple, reliable, and has lower manufacturing costs.

[0026] In some embodiments, the wall of the equal-diameter riser pipe 1 is provided with a connecting hole 4 that communicates with the furnace cavity. This connecting hole 4 is a through-hole penetrating the wall of the equal-diameter riser pipe 1, with one end communicating with the interior of the equal-diameter riser pipe 1 and the other end communicating with the gasifier furnace cavity. This connecting hole 4 can balance the pressure inside and outside the equal-diameter riser pipe 1. When the pressure inside the pipe becomes too high due to airflow fluctuations, pressure can be released into the furnace cavity through the connecting hole 4. Simultaneously, it can help discharge a small amount of accumulated ash adhering to the inner wall of the pipe, reducing the risk of blockage and further improving the stability of the device operation. Furthermore, in some embodiments, a control valve 41 is provided on the connecting hole 4. The control valve 41 is connected to the connecting hole 4 in a sealed manner, enabling precise control of the opening and closing state of the connecting hole 4. Therefore, the working state of the connecting hole 4 can be flexibly controlled according to the actual operating conditions of the gasifier, adapting to the operating requirements of different coal types.

[0027] In some embodiments, the supporting connection structure 5 is a connecting rod, through which the intermediate pipe 3 is supported and connected to the inner wall of the gasifier. The connecting rod is a rod-shaped structure, with its two ends connected to the outer wall of the intermediate pipe 3 and the inner wall of the gasifier, respectively. The connecting rod can stably fix the intermediate pipe 3 to the inner wall of the gasifier, effectively resisting the impact force generated on the intermediate pipe 3 during the flow of syngas, preventing the intermediate pipe 3 from shaking, shifting, or deforming, and ensuring that the intermediate pipe 3 always remains at a preset radial interval position. In addition, the connecting rod is connected to the inner wall of the gasifier by welding. This ensures sealing performance and structural strength, prevents detachment in the high-temperature and high-pressure working environment of the gasifier, improves support stability, prevents the intermediate pipe 3 from shifting due to loosening of the connecting rod, and extends the service life of the device.

[0028] In some embodiments, multiple connecting rods are respectively provided in the lower and upper sections of the intermediate pipe 3. These connecting rods are evenly distributed in both the lower and upper sections of the intermediate pipe 3, which distributes the force evenly and prevents excessive local stress that could lead to structural deformation. Providing multiple connecting rods in the upper and lower sections further enhances the overall stability of the intermediate pipe 3, preventing it from tilting due to uneven stress and ensuring that the radial distance between the intermediate pipe 3 and the constant-diameter riser pipe 1 remains consistent, thus guaranteeing a stable flow field.

[0029] In some embodiments, the isolation wall is configured as a cone shape. The convex surface of the cone-shaped isolation wall faces the interior of the furnace cavity, and the concave end corresponds to the outlet of the upper section of the furnace cavity. Its edge is sealed to the inner wall of the gasifier. This cone-shaped structure can guide the syngas to gather in the central region, facilitating the smooth entry of the syngas into the gap between the intermediate pipe 3 and the equal-diameter riser pipe 1. At the same time, it can assist the settling of droplets and ash on the cone surface, reducing ash adhesion and improving gas-liquid separation efficiency.

[0030] In some embodiments, a filter screen 7 is provided at the lower end of the intermediate pipe 3. The filter screen 7 is fixedly installed at the lower opening of the intermediate pipe 3. The filter screen 7 can filter larger particles of ash and slag entrained in the syngas, while reducing the wear of ash and slag on subsequent equipment, reducing the load on subsequent processing, and improving the operational reliability of the entire gasification system. In addition, in some embodiments, an overflow hole 6 is also provided on the pipe wall of the equal-diameter riser pipe 1. The overflow hole 6 is located at a corresponding height on the pipe wall of the equal-diameter riser pipe 1, which is adapted to the preset limit liquid level of the liquid pool. The overflow hole 6 penetrates the pipe wall of the equal-diameter riser pipe 1, with one end connected to the inside of the pipe and the other end connected to the furnace cavity. Thus, when the liquid level in the liquid pool is too high, the excess liquid can flow back to the furnace cavity through the overflow hole 6, preventing excessive liquid from entering the equal-diameter riser pipe 1 and increasing the amount of liquid droplets entrained in the syngas, ensuring the gas-liquid separation effect and stabilizing the quality of the syngas.

[0031] While numerous embodiments of this disclosure have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and intent of this disclosure. It should be understood that various alternatives to the embodiments of this disclosure described herein may be employed in the practice of this disclosure. The appended claims are intended to define the scope of this disclosure and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A flow stabilizing device inside a gasifier, wherein the lower section of the gasifier cavity is provided with a liquid pool for containing pulverized coal, the upper section is provided with an outlet, and an isolation wall connecting the upper and lower sections is also provided inside the gasifier, characterized in that, include: The equal diameter riser (1) is made of high temperature resistant alloy steel. It has a uniform diameter from the bottom inlet to the top outlet. The lower part of the equal diameter riser (1) is inserted into the liquid pool. Its outer wall is supported and connected to the inner wall of the gasifier. Its upper end is spaced apart from the isolation wall. An intermediate tube (3), which is cylindrical, is arranged radially at intervals inside the equal-diameter riser tube (1). The upper end of the intermediate tube (3) is sealed to the connecting hole on the isolation wall, and the upper end of the intermediate tube (3) is spaced apart from the upper end of the equal-diameter riser tube (1). A support connection structure (5) is provided to achieve a stable connection between the intermediate tube (3) and the inner wall of the gasifier.

2. The flow stabilizing device inside the gasifier according to claim 1, characterized in that, The wall of the equal-diameter riser pipe (1) is provided with a communication hole (4) that communicates with the furnace cavity.

3. The flow stabilizing device inside the gasifier according to claim 2, characterized in that, A control valve (41) is provided on the connecting hole (4).

4. The flow stabilizing device inside the gasifier according to claim 1, characterized in that, The supporting connection structure (5) is a connecting rod, and the intermediate tube (3) is supported and connected to the inner wall of the gasifier through the connecting rod.

5. The flow stabilizing device inside the gasifier according to claim 4, characterized in that, The connecting rod is connected to the inner wall of the gasifier by welding.

6. The flow stabilizing device inside the gasifier according to claim 4, characterized in that, The lower and upper sections of the intermediate tube (3) are respectively provided with multiple connecting rods.

7. The flow stabilizing device inside the gasifier according to any one of claims 1 to 6, characterized in that, The isolation wall is designed to be conical.

8. The flow stabilizing device inside the gasifier according to any one of claims 1 to 6, characterized in that, A filter screen (7) is provided at the lower end of the intermediate tube (3).

9. The flow stabilizing device inside the gasifier according to any one of claims 1 to 6, characterized in that, An overflow hole (6) is also provided on the pipe wall of the equal diameter riser pipe (1).

Images