Double-deslagging device for fluidized bed
By designing a dual slag discharge device, the slag discharge pipes under and above the bed are independently controlled, solving the problem of particle size control in the traditional single slag discharge mode, and realizing efficient and stable operation and low-cost operation and maintenance of fluidized bed boilers.
Patent Information
- Application Number
- CN202423229197.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2034-12-25
AI Technical Summary
Traditional single slag discharge mode is difficult to accurately control the particle size distribution in fluidized bed, resulting in low combustion efficiency, high equipment wear and tear, increased operation and maintenance costs, and is prone to blockage and uncontrolled pollutant emissions when processing low calorific value and high ash coal.
The system employs a dual slag discharge device, including an under-bed slag discharge pipe and an above-bed slag discharge pipe, which are used to process coarse and fine materials respectively. Equipped with valves and unblocking pipes, it achieves independent control and rapid unblocking, forming a dual slag discharge system.
It improves the flexibility and reliability of ash removal, ensures stable boiler operation under different fuel conditions, reduces the risk of blockage, lowers operation and maintenance costs, and enhances combustion efficiency and equipment safety.
Smart Images
Figure CN223909507U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to circulating fluidized bed boiler technical field especially relates to a double slagging device for fluidized bed. BACKGROUND
[0002] As a modern coal combustion technology, circulating fluidized bed boilers have been widely used in many industries, especially in power generation and heating, due to their wide fuel adaptability, high combustion efficiency, and excellent environmental performance. They show significant advantages in achieving efficient energy conversion and reducing environmental pollution. The core of fluidized bed technology is the efficient mixing and heat exchange of materials in the bed, but this process also brings challenges to the design and operation of the slagging system, especially when using low-calorific-value and high-ash-content coal.
[0003] However, traditional slagging systems mostly use single slagging mode, such as relying on inclined air distribution plate for slagging. Such systems can only discharge slag with specific direction and generally large particle size, making it difficult to accurately control the particle size distribution in the fluidized bed. Moreover, the single slagging mode is not flexible enough when dealing with difficult problems. With the change in coal resource quality, especially when using low-calorific-value and high-ash-content coal, a large amount of slag with different particle sizes emerges, which cannot be effectively handled by a single slagging port, easily causing blockage, interfering with material circulation and heat transfer, reducing combustion efficiency, increasing equipment wear and tear, and raising operation and maintenance costs. It may also lead to uncontrolled pollutant emissions, harming the environment and stable operation of equipment. SUMMARY
[0004] To address the deficiencies in the prior art, the utility model provides a double slagging device for fluidized bed, which improves the flexibility and reliability of slagging through two independent slagging systems (over-bed and under-bed slagging pipes).
[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:
[0006] A double slagging device for fluidized bed, comprising: a circulating fluidized bed furnace body; a wind chamber slagging pipe with a wind chamber for slagging is arranged on the circulating fluidized bed furnace body, a slagging pipe valve is arranged on the wind chamber slagging pipe for controlling the slagging flow; a slagging dredging pipe is also arranged on the wind chamber slagging pipe; a slag cooler is connected to the outlet end of the wind chamber slagging pipe for reducing the slagging temperature; the wind chamber slagging pipe includes an under-bed slagging pipe and an over-bed slagging pipe, one end of each of the under-bed slagging pipe and the over-bed slagging pipe is connected to the circulating fluidized bed furnace body, and the other end is connected to the inlet of the slag cooler.
[0007] As a further technical solution, a slag bin is sealingly connected to the outlet of the slag cooler for collecting and processing the slag.
[0008] As a further technical scheme, the under-bed slag discharge pipe is used for processing coarse slag discharge, and one end of the under-bed slag discharge pipe is connected to the bottom of the circulating fluidized bed furnace body, and the one end of the under-bed slag discharge pipe is communicated with the inside of the circulating fluidized bed furnace body.
[0009] As a further technical scheme, the under-bed slag discharge pipe is provided with an under-bed slag discharge pipe valve for controlling the flow of coarse slag discharge.
[0010] As a further technical scheme, the under-bed slag discharge pipe is provided with an under-bed slag discharge pipe valve for controlling the flow of coarse slag discharge.
[0011] As a further technical scheme, the under-bed slag discharge pipe is used for processing coarse slag discharge, and one end of the under-bed slag discharge pipe is connected to the bottom of the circulating fluidized bed furnace body, and the one end of the under-bed slag discharge pipe is communicated with the inside of the circulating fluidized bed furnace body.
[0012] As a further technical scheme, the under-bed slag discharge pipe is provided with an under-bed slag discharge pipe valve for controlling the flow of coarse slag discharge.
[0013] As a further technical scheme, the under-bed slag discharge pipe is provided with an under-bed slag discharge pipe valve for controlling the flow of coarse slag discharge.
[0014] As a further technical scheme, the under-bed slag discharge pipe is provided with an under-bed slag discharge pipe valve for controlling the flow of coarse slag discharge.
[0015] As a further technical scheme, the under-bed slag discharge pipe is provided with an under-bed slag discharge pipe valve for controlling the flow of coarse slag discharge.
[0016] The one or more technical schemes of the utility model have the following beneficial effects:
[0017] The utility model discloses a bed under the slag pipe and the bed on the slag pipe are provided with the slag pipe valve and the slag dredging pipe, and two independent slag discharge systems are formed, that is, the double slag discharge system (the bed on the slag pipe and the bed under the slag pipe), and the double slag discharge system is independently controlled, and the slag particle size is selected according to the slag particle size, and the particle size distribution is fine-tuned, and the slag discharge process is optimized, and the particle size distribution in the fluidized bed is accurately controlled. BRIEF DESCRIPTION OF DRAWINGS
[0018] The accompanying drawings, which form a part of this description, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments of the application illustrated in the drawings are presented by way of example or for clarification only. They are not meant to limit the scope of the application to many alternatives that have been made and continually retired but to explain the principles of the application.
[0019] Figure 1 It is a structure diagram of the double slag discharge device for the fluidized bed of the utility model;
[0020] Among them: 1, the bed under the slag pipe, 2, the bed on the slag pipe, 3, the bed under the slag pipe valve, 4, the bed on the slag pipe valve, 5, the bed under the slag dredging pipe, 6, the bed on the slag dredging pipe, 7, the cold slag machine, 8, the slag bin, 9, the circulating fluidized bed furnace body. DETAILED DESCRIPTION
[0021] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the application. Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the application pertains.
[0022] Example one
[0023] As Figure 1 The utility model discloses a double slag discharge device for the fluidized bed, including: circulating fluidized bed furnace body 9, be provided with the air chamber slag pipe for discharging slag on circulating fluidized bed furnace body 9, be provided with slag pipe valve on air chamber slag pipe, for control slag flow, and air chamber slag pipe still be provided with slag dredging pipe on, the outlet end of air chamber slag pipe is connected with cold slag machine 7, for reducing slag temperature. Specifically: in this embodiment, air chamber slag pipe includes bed under the slag pipe 1 and the bed on the slag pipe 2, as Figure 1As shown, one end of the under-bed slag discharge pipe 1 and the over-bed slag discharge pipe 2 are connected to the circulating fluidized bed furnace body 9, and the other end is connected to the inlet of the slag cooler 7. As can be seen, two independent slag discharge systems are designed in this embodiment, namely a double slag discharge system (the over-bed slag discharge pipe 2 and the under-bed slag discharge pipe 1), which is independently controlled. The under-bed slag discharge pipe 1 is used for processing coarse slag discharge, and the over-bed slag discharge pipe 2 is used for processing fine slag discharge. Such design enables the boiler to manage slag discharge in a more efficient and flexible manner according to different fuel types (such as various coal or biomass fuels) and operating conditions.
[0024] In this embodiment, the slag cooler 7 is sealingly connected to the slag bin 8 at the outlet thereof for collecting the processed slag. The direct connection between the slag cooler 7 and the slag bin 8 reduces the loss of slag during transportation and effectively reduces the risk of environmental pollution and secondary pollution. At the same time, the application of the slag cooler 7 improves the safety of the slag discharge system by effectively reducing the temperature of the slag and reducing the thermal damage to other equipment.
[0025] In this embodiment, as shown in Figure 1 The under-bed slag discharge pipe 1 is connected to the bottom of the circulating fluidized bed furnace body 9 at one end, and the under-bed slag discharge pipe 1 is in communication with the interior of the circulating fluidized bed furnace body 9 at one end, and the under-bed slag discharge pipe 1 is provided with an under-bed slag discharge pipe valve 3 for controlling the flow of coarse slag. At the same time, the end of the under-bed slag discharge pipe 1 near the inlet of the slag cooler 7 is provided with an under-bed slag discharge dredging pipe 5 for quickly dredging when the under-bed slag discharge pipe 1 is blocked. One end of the under-bed slag discharge dredging pipe 5 is in communication with the under-bed slag discharge pipe 1, and the other end of the under-bed slag discharge dredging pipe 5 is connected to a first air pump (not shown in the figure) for dredging slag. As shown in Figure 1As shown, one end of the over-bed slag discharge pipe 2 is connected to the side wall of the circulating fluidized bed furnace body 9, and the other end of the over-bed slag discharge pipe communicates with the interior of the circulating fluidized bed furnace body, the over-bed slag discharge pipe 2 is provided with an over-bed slag discharge pipe valve 4 for controlling the flow of fine slag, and the over-bed slag discharge pipe 2 is also provided with an over-bed slag discharge dredging pipe 6 for quickly dredging when the over-bed slag discharge pipe 2 is blocked. Specifically, the end of the over-bed slag discharge pipe 2 close to the circulating fluidized bed furnace body 9 is provided as a slope for accelerating the flow of slag and avoiding blockage, and the middle position of the over-bed slag discharge pipe 2 is provided as an arc structure, and the over-bed slag discharge dredging pipe 6 is arranged at the arc structure (where blockage is prone to occur). In this embodiment, one end of the over-bed slag discharge dredging pipe 6 communicates with the over-bed slag discharge pipe 2, and the other end of the over-bed slag discharge dredging pipe 6 is connected with a second air pump for dredging slag. In view of the limitations of the prior art, the embodiment proposes a double slag discharge port slag discharge device, which aims to improve the flexibility and reliability of slag discharge through two independent slag discharge systems (over-bed and under-bed). The innovation of the embodiment also lies in the design of the two slag discharge pipes, which can be independently controlled and used for the discharge of coarse and fine materials, further optimizing the slag discharge process. Each slag discharge pipe is equipped with a special valve and a dredging pipe, so that the operator can select to open the over-bed or under-bed slag discharge port according to the actual needs of the particle size distribution of the circulating material. This double slag discharge port design not only improves the ability to handle different types of materials, but also enhances the flexibility of the device in dealing with difficult waste slag through independent control of the valves. For example, when the under-bed slag discharge port is blocked when handling coarse or impurity-rich waste slag, the device can quickly switch to the over-bed slag discharge port for continuous operation without affecting the normal operation of the boiler. At the same time, the dredging pipe design of each slag discharge pipe ensures that the slag discharge function can be quickly restored in long-term operation or special circumstances, avoiding the whole system shutdown caused by slag discharge problems, and significantly improving the economy and safety of the circulating fluidized bed boiler.
[0026] The above only describes preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various changes and modifications to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.
Claims
1. A double slagging device for a fluidized bed, characterized in that The utility model relates to a circulating fluidized bed boiler, and belongs to the field of boiler. The circulating fluidized bed boiler is provided with a wind chamber slag discharge pipe for discharging slag and having a wind chamber, the wind chamber slag discharge pipe is provided with a slag discharge pipe valve for controlling the discharge flow, the wind chamber slag discharge pipe is also provided with a slag discharge dredging pipe, the outlet end of the wind chamber slag discharge pipe is connected with a slag cooler for reducing the discharge temperature, and the wind chamber slag discharge pipe comprises a bed under slag discharge pipe and a bed over slag discharge pipe, one end of each of the bed under slag discharge pipe and the bed over slag discharge pipe is connected with the circulating fluidized bed boiler, and the other end is connected with the inlet of the slag cooler. The outlet of the slag cooler is sealingly connected with a slag bin for collecting the treated discharge slag.
2. A double slagging device for fluidized bed as claimed in claim 1, wherein, The bed under slag discharge pipe is used for treating coarse material discharge slag, one end of the bed under slag discharge pipe is connected with the bottom of the circulating fluidized bed boiler, and the one end of the bed under slag discharge pipe communicates with the inside of the circulating fluidized bed boiler.
3. A double slagging device for fluidized bed as claimed in claim 1 wherein, The bed under slag discharge pipe is provided with a bed under slag discharge pipe valve for controlling the flow of the coarse material discharge slag.
4. A double slagging device for fluidized bed as claimed in claim 3 wherein, The end of the bed under slag discharge pipe close to the inlet of the slag cooler is provided with a bed under slag discharge dredging pipe for quickly dredging when the bed under slag discharge pipe is blocked.
5. A double slagging device for fluidized bed as claimed in claim 3 wherein, One end of the bed under slag discharge dredging pipe communicates with the bed under slag discharge pipe, and the other end of the bed under slag discharge dredging pipe is connected with a first air pump for dredging the discharge slag. The bed over slag discharge pipe is used for treating fine material discharge slag, one end of the bed over slag discharge pipe is connected with the sidewall of the circulating fluidized bed boiler, and the one end of the bed over slag discharge pipe communicates with the inside of the circulating fluidized bed boiler, the bed over slag discharge pipe is provided with a bed over slag discharge pipe valve for controlling the flow of the coarse material discharge slag.
6. A double slagging device for fluidized bed as set forth in claim 1, wherein The bed over slag discharge pipe is also provided with a bed over slag discharge dredging pipe for quickly dredging when the bed over slag discharge pipe is blocked.
7. A double slagging device for fluidized beds as claimed in claim 6, characterized in that The end of the bed over slag discharge pipe close to the circulating fluidized bed boiler is a slope for accelerating the flow of the discharge slag and avoiding blockage.
8. A double slagging device for fluidized bed as claimed in claim 6 wherein, The middle position of the bed over slag discharge pipe is an arc structure, and the bed over slag discharge dredging pipe is arranged at the arc structure.
9. A double slagging device for fluidized bed as claimed in claim 7 wherein, One end of the bed over slag discharge dredging pipe communicates with the bed over slag discharge pipe, and the other end of the bed over slag discharge dredging pipe is connected with a second air pump for dredging the discharge slag.
10. A double slagging device for fluidized bed as claimed in claim 9 wherein,