Slag removal device for fluidized bed boiler furnace bottom

Abstract

This utility model provides a slag removal device for the bottom of a fluidized bed boiler, including a main slag removal pipe connected to the bottom of the boiler. A slag cooler pipe and an emergency slag removal pipe are connected to the side of the main slag removal pipe. A slide valve and a coke removal mechanism are installed at the lower end of the main slag removal pipe, with the coke removal mechanism located below the slide valve. A drain pipe is installed on one side of the bottom of the main slag removal pipe. The advantages of this utility model are: it can improve the coke removal efficiency through a retractable and rapid coke removal mechanism without affecting the main slag removal channel; and during the coke removal process, the threaded seal solves the problem of hot slag scalding operators and causing safety accidents.

Description

Technical Field

[0001] This utility model belongs to the field of sludge treatment technology, specifically relating to a slag discharge device for the bottom of a fluidized bed boiler. Background Technology

[0002] Fluidized bed boilers are boiler devices that utilize fluidized bed combustion technology. They are primarily used to process difficult-to-burn solid fuels. Fluidized bed boilers achieve volume reduction of solid waste through high-temperature combustion, while simultaneously recovering heat energy for heating or power generation. They are often used in the incineration of municipal sludge. Existing ash removal methods for fluidized bed boilers include... Figure 1 As shown, a vertical slag cooler pipe is typically connected directly to the bottom slag cooler for continuous slag discharge. An emergency slag discharge pipe 3 with a slide valve is usually installed in the middle of the pipe as a branch for emergency slag discharge and removing coke when the bed becomes coke-prone. While this method is structurally simple, during high-temperature incineration, the organic and inorganic substances (such as heavy metal sludge) in the sludge melt and adhere due to the excessively high temperature, forming hard coke lumps. In this case, manual cleaning of the coke inside the pipe using steel bars 7 is necessary, which can easily cause burns. However, failure to remove the coke lumps in time will affect the normal operation of the boiler. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a slag removal device for the bottom of a fluidized bed boiler.

[0004] The objective of this utility model is achieved through the following technical solution: A slag discharge device for the bottom of a fluidized bed boiler includes a main slag discharge pipe connected to the bottom of the boiler. The side of the main slag discharge pipe is connected to a slag cooler pipe and an emergency slag discharge pipe. A slide valve and a coke removal mechanism are installed at the lower end of the main slag discharge pipe. The coke removal mechanism is located below the slide valve. A drain pipe is installed on one side of the bottom of the main slag discharge pipe.

[0005] Preferably, the lower end of the emergency slag discharge pipe is equipped with a slide valve for opening and closing the pipe.

[0006] Preferably, the feed inlet of the cold slag machine pipeline is higher than the feed inlet of the emergency slag discharge pipeline.

[0007] Preferably, the coke removal mechanism includes a quick-push threaded rod connected to the bottom of the slag discharge main pipe, the upper end of the quick-push threaded rod extending towards the bottom of the boiler, the upper part of the quick-push threaded rod being provided with coke removal blades, and the bottom of the quick-push threaded rod being provided with a rotating handle.

[0008] Preferably, the quick-push threaded rod is connected to the main slag discharge pipe via a special-shaped nut. The length of the quick-push threaded rod is greater than the length of the main slag discharge pipe. The upper diameter of the quick-push threaded rod is smaller than the lower diameter. The lower end of the quick-push threaded rod is machined with a thread that matches the internal thread of the special-shaped nut.

[0009] Preferably, the descaling blade is a spiral blade.

[0010] The beneficial effects of this utility model are as follows: without affecting the main slag discharge channel, the decoking efficiency can be improved through the retractable and rapid decoking mechanism. At the same time, during the decoking process, the threaded seal solves the problem of hot slag burning the operators and causing safety accidents. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 : Schematic diagram of the slag discharge mechanism in a fluidized bed boiler in the prior art.

[0013] Figure 2 : A schematic diagram of the slag discharge mechanism of the fluidized bed boiler of this utility model.

[0014] Figure 3 : A schematic diagram of the slag discharge mechanism of the fluidized bed boiler in use according to this utility model. Detailed Implementation

[0015] This utility model discloses a slag removal device for the bottom of a fluidized bed boiler, combined with... Figure 2 , Figure 3 As shown, the system includes a main slag discharge pipe 1 connected to the bottom of the boiler. A slag cooler pipe 2 and an emergency slag discharge pipe 3 are connected to the side of the main slag discharge pipe 1. The inlet of the slag cooler pipe 2 is higher than the inlet of the emergency slag discharge pipe 3. The outlet of the slag cooler pipe 2 is connected to the slag cooler. A slide valve 5 for opening and closing the pipe is installed at the lower end of the emergency slag discharge pipe 3. A slide valve 5 and a coke removal mechanism are installed at the lower end of the main slag discharge pipe 1. The slide valve 5 is a manual slide valve. The coke removal mechanism is located below the slide valve 5. A drain pipe 4 is installed on one side of the bottom of the main slag discharge pipe 1, and the drain pipe 4 is inclined and positioned on one side of the main slag discharge pipe 1.

[0016] The coke removal mechanism includes a quick-push threaded rod connected to the bottom of the slag discharge main pipe 1. The quick-push threaded rod is connected to the slag discharge main pipe via a special-shaped nut 64. The upper end of the quick-push threaded rod 61 extends towards the bottom of the boiler. The length of the quick-push threaded rod 61 is greater than the length of the slag discharge main pipe 1, which facilitates the quick-push threaded rod 61 to extend into the bottom of the boiler for coke removal operations.

[0017] The upper part of the quick-push threaded rod 61 is equipped with a coke-removing blade 63. The coke-removing blade 63 is a spiral blade; compared to a single reinforcing bar, the spiral blade increases the contact area for slag removal, ensuring effective slag removal and rapid coke removal. A rotating handle 64 is provided at the bottom of the quick-push threaded rod. In this invention, the slide valve inside the main slag discharge pipe 1 achieves physical isolation between the coke-removing mechanism and the main slag discharge channel. This structure effectively avoids damage to the coke-removing mechanism caused by high-temperature slag during daily slag discharge, and prevents wear, thermal deformation, and high-temperature oxidation damage to the quick-push threaded rod and coke-removing blades inside the coke-removing device, greatly extending the service life of the core coke-removing components. The quick-push threaded rod 61 described in this invention adopts a variable diameter design, with the upper section having a smaller diameter than the lower section, and its tip having a pointed structure. The lower end of the quick-push threaded rod 61 is also provided with threads machined to match the internal threads of the non-standard nut 64. This variable diameter design allows the smaller upper section to quickly and with low resistance advance upwards within the main pipe when high-level coking occurs on the sand bed above the slag discharge main pipe 1. This enables the front-end coking removal blades 63 to quickly and accurately reach the high-level coking area, significantly shortening the coking preparation time and improving the overall coking removal efficiency. The threaded seal further prevents hot slag from burning operators during slag discharge, ensuring safety during use.

[0018] To better understand this utility model, the following explanation will further elaborate on its usage process.

[0019] During normal slag discharge, the manual slide valve 5 of the emergency slag discharge pipeline 3 remains closed, blocking the emergency slag discharge pipeline 3. The slag falls naturally through the main slag discharge pipeline 1 and directly enters the slag cooler through the slag cooler pipeline 2 for cooling. When the slag cooler malfunctions or the main channel is abnormal, the manual slide valve 5 of the emergency slag discharge pipeline 3 is opened, and the slag is diverted from the main slag discharge pipeline 1 to the emergency slag discharge pipeline 3 to be quickly discharged from the system, ensuring the safe continuous operation of the boiler.

[0020] When coking and slag discharge failure are detected at the slag discharge port at the bottom of the fluidized bed boiler, firstly, open the manual slide valve 5 of the main slag discharge pipe 1 to connect the inlet of the coking removal mechanism with the internal space of the main slag discharge pipe 1; then, after reaching the coke block position through the quick-push threaded rod 61, turn the rotating handle 64, and through the transmission of the quick-push threaded rod 61, push the front end of the coking removal blade 63 to the coking area at the top of the main slag discharge pipe 1; under the direct action of the rotating coking removal blade 63, the coke block is stirred, cut and broken, and the coke block falls and is removed.

[0021] After the coke removal is completed, rotate the handle 64 in the opposite direction to smoothly retract the coke removal blade 63 to the bottom position of the main slag discharge pipe 1; close the manual slide valve 5 of the main slag discharge pipe 1 to cut off the connection between the coke removal mechanism and the main slag discharge pipe 1, and restore the independent operation state of the main slag discharge pipe 1; the coke fragments and slag particles remaining in the cavity of the coke removal mechanism are completely discharged from the system through the drain pipe 11 at its bottom under the action of gravity. After confirming that the inside of the coke removal mechanism is emptied, the coke removal process is over and the system can return to normal slag discharge state.

[0022] Finally, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for 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 utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] Furthermore, the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it; although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A slagging device for a fluidized bed boiler bottom, characterized in that: It includes a slag discharge main pipe connected to the bottom of the boiler, a slag cooler pipe and an emergency slag discharge pipe connected to the side of the slag discharge main pipe, a slide valve and a coke removal mechanism installed at the lower end of the slag discharge main pipe, the coke removal mechanism being located below the slide valve, and a discharge pipe installed on one side of the bottom of the slag discharge main pipe.

2. A fluidized bed boiler bottom ash discharging device according to claim 1, characterized in that The lower end of the emergency slag discharge pipeline is equipped with a slide valve for opening and closing the pipeline.

3. A fluidized bed boiler bottom ash discharging device according to claim 2, characterized in that: The feed inlet of the cold slag machine pipeline is higher than the feed inlet of the emergency slag discharge pipeline.

4. The slag discharge device for the bottom of a fluidized bed boiler as described in claim 3, characterized in that: The coke removal mechanism includes a quick-push threaded rod connected to the bottom of the slag discharge main pipe. The upper end of the quick-push threaded rod extends towards the bottom of the boiler. The upper part of the quick-push threaded rod is provided with coke removal blades, and the bottom of the quick-push threaded rod is provided with a rotating handle.

5. The slag discharge device for the bottom of a fluidized bed boiler as described in claim 4, characterized in that: The quick-push threaded rod is connected to the main slag discharge pipe via a special-shaped nut. The length of the quick-push threaded rod is greater than the length of the main slag discharge pipe. The upper diameter of the quick-push threaded rod is smaller than the lower diameter. The lower end of the quick-push threaded rod is machined with a thread that matches the internal thread of the special-shaped nut.

6. The slag discharge device for the bottom of a fluidized bed boiler as described in claim 5, characterized in that: The descaling blades are spiral blades.

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