Gasifying agent preheater with steam inlet device

Abstract

The utility model discloses a gasifying agent preheater with a steam inlet device, and belongs to the field of gasifying agent waste heat equipment. The steam preheater comprises a preheater shell, a steam collecting box is installed on the outer side of the preheater shell, a steam outlet pipe and a steam inlet pipe externally connected with a steam source are connected to the steam collecting box, one end of the steam outlet pipe is connected with the steam collecting box, and the other end of the steam outlet pipe penetrates through an opening in the preheater shell to extend into the preheater shell. A baffle is arranged at the end, extending into the preheater shell, of the steam outlet pipe, and a notch with the opening direction the same as the axial direction of the heat exchange pipe is formed in the side wall of the steam outlet pipe at the end. By improving the structure of the steam inlet device and the structure of the joint of the steam inlet device and the gasifying agent preheater, damage of low-temperature steam to a heat exchange tube in the gasifying agent preheater can be effectively reduced, and the service life of the heat exchange tube is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of waste heat equipment for gasifying agents, and more specifically, it relates to a gasifying agent preheater with a steam inlet device. Background Technology

[0002] In a circulating fluidized bed gasification system, the high-temperature gasifying agent preheater is one of the core components. It effectively utilizes the heat dissipated during the cooling of the high-temperature coal gas within the equipment to preheat the reacting gasifying agent (air + steam) required for the gasifier. The higher the coal gas temperature, the higher the temperature the gasifying agent can be heated, resulting in a higher calorific value of the coal gas produced during the gasifier reaction. This achieves efficient energy utilization and energy conservation and emission reduction, making it a highly efficient, environmentally friendly, and reliable heat recovery device.

[0003] When the preheater is working, high-temperature coal gas passes through the tube side of the high-temperature gasification preheater, while the gasifying agent to be heated passes through the shell side, which is similar to the basic structure of a typical tubular heat exchanger. In existing equipment, to further improve heat exchange efficiency, the direction of flow of the gasifying agent (air + steam) is reversed compared to that of the coal gas; the coal gas flows from top to bottom, while the gasifying agent flows from bottom to top. The baffle plates increase the contact time between the gasifying agent and the heat exchange tubes, thereby improving heat exchange efficiency. However, when low-temperature steam is introduced, it comes into direct contact with the heat exchange tubes, easily causing them to crack and reducing the equipment's lifespan. The greater the temperature difference, the more significant the damage, thus limiting the overall utilization rate of thermal energy by the equipment.

[0004] For example, Chinese patent application number CN202011621006.2, published on April 23, 2021, discloses an organic solid waste gasification incineration system and method. The system includes a fixed-bed gasifier, a secondary combustion chamber, a waste heat boiler, and a gas preheater. The fixed-bed gasifier includes a feeding device, a reaction zone furnace body, a top gasifying agent inlet, a middle gasifying agent inlet, a bottom gasifying agent inlet, a gas outlet, and a slag discharge device. In this design, the gas preheater is the same as the gasifying agent preheater, which suffers from the aforementioned problem of low-temperature steam damaging the heat exchange tubes.

[0005] For example, Chinese patent application number CN201410370202.5, published on November 26, 2014, discloses a Fischer-Tropsch reactor pure oxygen continuous gasification device, including a coking machine, a pure oxygen gasifier, a cyclone separator, a sensible heat recovery unit, a gasifying agent preheater, and a mixing tank. The pure oxygen gasifier has a height-to-diameter ratio of 2.4 to 3.2. The mixing tank has an oxygen inlet and a steam inlet. The mixing tank is connected to the gasifying agent preheater via pipeline, and the gasifying agent preheater is connected to the pure oxygen gasifier via pipeline. The top of the pure oxygen gasifier is connected to the coking machine, and the upper part of the pure oxygen gasifier is connected to the cyclone separator via pipeline. The cyclone separator is connected to the sensible heat recovery unit. This solution also uses a gasifying agent preheater, and similarly suffers from the aforementioned problem of low-temperature steam damaging the heat exchange tubes. Summary of the Invention

[0006] 1. The problem to be solved

[0007] In response to the problem that low-temperature steam can directly contact the heat exchange tubes in existing gasifying agent preheaters, which can easily lead to cracking of the heat exchange tubes, this utility model provides a gasifying agent preheater with a steam inlet device. By improving the structure of the steam inlet device and the connection between the steam inlet device and the gasifying agent preheater, the damage of low-temperature steam to the heat exchange tubes in the gasifying agent preheater can be effectively reduced, and the service life of the heat exchange tubes can be improved.

[0008] 2. Technical Solution

[0009] To solve the above problems, the present invention adopts the following technical solution.

[0010] A gasifying agent preheater with a steam inlet device includes a preheater shell, a steam header is installed on the outside of the preheater shell, a steam outlet pipe and a steam inlet pipe for an external steam source are connected to the steam header, one end of the steam outlet pipe is connected to the steam header, and the other end extends into the interior of the preheater shell through an opening on the preheater shell, a baffle is installed at the end of the steam outlet pipe extending into the interior of the preheater shell, and a notch is opened on the side wall of the steam outlet pipe at this end with the opening direction being the same as the axial direction of the heat exchange tube.

[0011] As a further improvement to the technical solution, multiple steam outlet pipes are provided and arranged at intervals on the steam header.

[0012] As a further improvement to the technical solution, multiple steam inlet pipes are provided and arranged at intervals on the steam header.

[0013] As a further improvement to the technical solution, the steam header is an arc-shaped pipe section arranged around the outside of the preheater shell.

[0014] As a further improvement to the technical solution, an anti-impact sleeve is fitted on the heat exchange tube near the notch of the steam outlet pipe.

[0015] As a further improvement to the technical solution, multiple baffles are interspersed inside the preheater shell.

[0016] As a further improvement to the technical solution, the anti-impact sleeve has multiple units, which are arranged on the heat exchange tube between two adjacent baffles.

[0017] As a further improvement to the technical solution, a drain pipe is also connected to the steam header.

[0018] As a further improvement to the technical solution, the length direction of the sewage pipe is perpendicular to the horizontal plane.

[0019] As a further improvement to the technical solution, the ends of the steam header are fitted with end caps.

[0020] 3. Beneficial effects

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] (1) The present invention provides a gasifying agent preheater with a steam inlet device. By setting a notch and baffle that cooperate with each other at the end of the steam outlet pipe, the flow direction of the low-temperature steam entering the preheater shell can be changed, so that it is sprayed along the axial direction of the heat exchange tube, avoiding direct contact between the low-temperature steam and the heat exchange tube, effectively reducing the damage of the low-temperature steam to the heat exchange tube, and improving the service life of the heat exchange tube.

[0023] (2) The present invention provides a gasifying agent preheater with a steam inlet device, which is equipped with multiple steam outlet pipes and steam inlet pipes. It adopts a multi-point steam introduction method to reduce the range that low-temperature water vapor can radiate at the moment of introduction, and further reduce the damage to the heat exchange tube.

[0024] (3) The present invention provides a gasifying agent preheater with a steam inlet device. An anti-impact sleeve is provided on the heat exchange tube near the gap of the steam outlet pipe. This sleeve can prevent the heat exchange tube from directly contacting the low-temperature steam, protect the heat exchange tube, and reduce the damage to the heat exchange tube caused by the low-temperature steam.

[0025] (4) The present invention provides a gasifying agent preheater with a steam inlet device. By setting baffles, the contact time between low-temperature steam and heat exchange tubes can be increased and the heat exchange efficiency can be improved by blocking the flow through the baffles.

[0026] (5) The present invention provides a gasifying agent preheater with a steam inlet device. By setting up a drain pipe, the residual waste liquid in the steam header can be discharged from the drain pipe, thereby preventing the accumulation of waste liquid and its entry into the preheater shell, which would have an impact. Attached Figure Description

[0027] Figure 1 This is a top view of the steam inlet device and gasifying agent preheater of this utility model.

[0028] Figure 2 This is a cross-sectional view of the steam inlet device and gasifying agent preheater of this utility model;

[0029] In the diagram: 1. Steam inlet pipe; 2. Steam header; 3. Baffle; 4. Steam outlet pipe; 5. Anti-impact sleeve; 6. Heat exchanger tube; 7. Baffle plate; 8. Preheater shell; 9. Drain pipe; 10. End cap. Detailed Implementation

[0030] Exemplary embodiments of the present invention are described in detail below. While these exemplary embodiments have been described in sufficient detail to enable those skilled in the art to practice the present invention, it should be understood that other embodiments may be implemented and various changes may be made to the present invention without departing from its spirit and scope. The more detailed description of embodiments of the present invention below is not intended to limit the scope of the claimed invention, but is merely illustrative and does not limit the description of the features and characteristics of the invention, in order to provide the best mode for carrying out the invention and sufficient to enable those skilled in the art to practice it. Therefore, the scope of the present invention is defined only by the appended claims.

[0031] Example 1

[0032] A gasifying agent preheater with a steam inlet device is used in a fluidized bed gasification system to preheat the gasifying agent participating in the reaction. Its specific structure and technical effects are described in detail below.

[0033] like Figure 1 and Figure 2 As shown, the preheater includes a preheater shell 8, with a steam header 2 mounted on the outside of the preheater shell 8. The steam header 2 is connected to a steam outlet pipe 4 and a steam inlet pipe 1 for connecting to an external steam source. In this embodiment, to save installation space and facilitate the connection of various pipes, the steam header 2 is an arc-shaped pipe section larger than the outer diameter of the preheater shell 8, arranged around the outside of the preheater shell 8. A sealing cap 10 is installed at the end of the steam header 2 to prevent steam leakage and ensure sealing.

[0034] One end of the steam outlet pipe 4 is connected to the steam header 2, and the other end extends into the interior of the preheater shell 8 through an opening. A baffle 3 is installed at the end of the steam outlet pipe 4 that extends into the preheater shell 8, and a notch with the opening direction aligned with the axial direction of the heat exchange tube 6 is formed on the side wall of this end. Through the matching notch and baffle 3, the flow direction of the low-temperature steam entering the preheater shell 8 can be changed, causing it to spray along the axial direction of the heat exchange tube 6. This avoids direct contact between the low-temperature steam and the heat exchange tube 6, effectively reducing damage to the heat exchange tube 6 and extending its service life.

[0035] In this embodiment, multiple steam outlet pipes 4 and steam inlet pipes 1 are provided and arranged at intervals on the steam header 2. This multi-point steam introduction method reduces the range that the low-temperature steam can radiate at the moment of introduction, further reducing damage to the heat exchange tubes 6.

[0036] In addition, an anti-surge sleeve 5 is fitted on the heat exchange tube 6 near the notch of the steam outlet pipe 4 to prevent direct contact between the heat exchange tube 6 and the low-temperature steam, thus protecting the heat exchange tube 6 and reducing damage to it. Simultaneously, multiple baffles 7 are interspersed within the preheater shell 8. The baffles 7 increase the contact time between the low-temperature steam and the heat exchange tube 6, improving heat exchange efficiency. In this embodiment, multiple anti-surge sleeves 5 are arranged on the heat exchange tube 6 between adjacent baffles 7. A drain pipe 9 is also connected to the steam header 2. The length of the drain pipe 9 is perpendicular to the horizontal plane, allowing residual waste liquid in the steam header 2 to be discharged, preventing its accumulation and subsequent entry into the preheater shell 8.

[0037] In summary, the gasifying agent preheater with a steam inlet device in this embodiment, by improving the structure of the steam inlet device and the structure of the connection between the steam inlet device and the gasifying agent preheater, can effectively reduce the damage of low-temperature steam to the heat exchange tubes in the gasifying agent preheater and improve the service life of the heat exchange tubes.

Claims

1. A gasification agent preheater with steam inlet device, comprising a preheater shell (8), the outer side of which is provided with a steam header (2), the steam header (2) is connected with a steam outlet pipe (4) and a steam inlet pipe (1) connected with an external steam source, characterized in that: One end of the steam outlet pipe (4) is connected with the steam header (2), the other end extends into the inside of the preheater shell (8) through the opening on the preheater shell (8), the end of the end extending into the inside of the preheater shell (8) is provided with a baffle (3), and the side wall of the steam outlet pipe (4) at the end is provided with a notch with the same opening direction as the axial direction of the heat exchange pipe (6).

2. A gasification agent preheater with a steam inlet device according to claim 1, characterized in that: The steam outlet pipe (4) is provided with multiple steam outlet pipes, which are arranged at intervals on the steam header (2).

3. A gasification agent preheater with a steam inlet device according to claim 2, characterized in that: The steam inlet pipe (1) is provided with multiple steam inlet pipes, which are arranged at intervals on the steam header (2).

4. A gasification agent preheater with a steam inlet device according to claim 1, characterized in that: The steam header (2) is a circular arc pipe section arranged around the outside of the preheater shell (8).

5. A gasification agent preheater with steam inlet device according to claim 1, characterized in that: The heat exchange pipe (6) is provided with a plurality of anti-collision sleeves (5) sleeved on the position close to the notch of the steam outlet pipe (4).

6. A gasification agent preheater with steam inlet means according to claim 5, characterized in that: A plurality of baffles (7) are arranged in the preheater shell (8).

7. A gasification agent preheater with steam inlet means according to claim 6, characterized in that: The anti-collision sleeve (5) has multiple anti-collision sleeves, which are arranged on the heat exchange pipe (6) between two adjacent baffles (7).

8. A gasification agent preheater with a steam inlet device according to any one of claims 1-7, characterized in that: The steam header (2) is further connected with a blowdown pipe (9).

9. A gasification agent preheater with a steam inlet device according to claim 8, characterized in that: The length direction of the blowdown pipe (9) is perpendicular to the horizontal plane.

10. A gasification agent preheater with a steam inlet device according to any one of claims 1-7, characterized in that: The end of the steam header (2) is provided with an end cover (10).

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