CN-224215324-U - Circulating fluidized bed boiler feeding device

CN224215324UCN 224215324 UCN224215324 UCN 224215324UCN-224215324-U

Abstract

The utility model discloses a feeding device of a circulating fluidized bed boiler, which relates to the technical field of circulating fluidized bed boilers and comprises a feeding pipe and a pneumatic feeding assembly, wherein the pneumatic feeding assembly is used for providing conveying power for fuel particles in the feeding pipe, the pneumatic feeding assembly comprises an outer connecting pipe, an air inlet pipe, a sliding sleeve, a conical plug and a discharge port, and high-pressure air is conveyed into the outer connecting pipe through the air inlet pipe and used for pushing the sliding sleeve, the conical plug and the discharge port to horizontally move so as to enable the discharge port to be communicated with the feeding pipe, so that the conveying channel of the fuel particles is communicated. According to the utility model, the pneumatic feeding assembly and the central air pipe are arranged to realize efficient feeding of fuel particles, when the air pressure in the boiler is increased suddenly due to the entering of the fuel particles and the deflagration and is larger than the air pressure in the outer connecting pipe, the conical plug can reset to block the outer connecting pipe under the pushing of the air pressure in the boiler, so that the contact of the air in the boiler and the fuel particles in the feeding pipe is avoided, and the feeding operation safety is ensured.

Inventors

LIU TONG
KONG FANJING
LIU YONGQING
XIA XIANGJIE
ZHANG YUXUAN

Assignees

山东聚发数字工业技术有限公司

Dates

Publication Date: 20260508
Application Date: 20250529

Claims (5)

1. The feeding device of the circulating fluidized bed boiler comprises a feeding pipe (1), and is characterized in that a pneumatic feeding assembly (2) is arranged on the outer side of a discharging position of the feeding pipe (1), and the pneumatic feeding assembly (2) is used for providing conveying power for fuel particles in the feeding pipe (1); the pneumatic feeding assembly (2) comprises an outer connecting pipe (201), an air inlet pipe (202), a sliding sleeve (204), a conical plug (205) and a discharge hole (206); The outer connecting pipe (201) is fixed on the outer side of the discharge end of the feeding pipe (1), and the front end of the outer connecting pipe (201) is fixedly communicated with the boiler; The air inlet pipe (202) is fixed on the outer side of one end of the outer connecting pipe (201) far away from the boiler and is communicated with the inner cavity of the outer connecting pipe (201); The sliding sleeve (204) is distributed on the inner side of the outer connecting pipe (201) and is sleeved on the outer side of the feeding pipe (1) in a sliding manner, the conical plug (205) is fixed at one end of the sliding sleeve (204) and is distributed at the front end of the feeding pipe (1), and the circumference of the discharging hole (206) is formed in the outer periphery of the sliding sleeve (204) and is communicated with the inner cavity of the sliding sleeve (204); High-pressure air is conveyed to the inside of the outer connecting pipe (201) through the air inlet pipe (202) and used for pushing the sliding sleeve (204), the conical plug (205) and the discharge port (206) to horizontally move so that the discharge port (206) is communicated with the feeding pipe (1), and therefore the conduction of a conveying channel of fuel particles is achieved.
2. A circulating fluidized bed boiler feeding device according to claim 1, wherein the outer connecting pipe (201) is provided with a conical reamer (203) formed at a position close to the conical plug (205), and the conical surface of the conical plug (205) is fitted with the conical reamer (203) for sealing the outer connecting pipe (201).
3. A circulating fluidized bed boiler feeding device according to claim 1, characterized in that a fixed ring block (3) is fixed on the outer side of the front end of the feeding pipe (1), and the outer wall of the fixed ring block (3) is matched with the diameter of the inner wall of the sliding sleeve (204).
4. A circulating fluidized bed boiler feeding device according to claim 1, characterized in that the conical plug (205) is located inside the sliding sleeve (204) and is formed with conical protrusions, and the conical protrusions are attached to the front end of the feeding pipe (1) for realizing front end blocking of the feeding pipe (1).
5. A circulating fluidized bed boiler feeding device according to claim 4, characterized in that one end of the feeding pipe (1) is provided with a central air pipe (4) penetrating horizontally into the inside of the feeding pipe (1), and that one end of the central air pipe (4) is close to the front end of the feeding pipe (1) and is not in contact with the conical protrusion of the conical plug (205).

Description

Circulating fluidized bed boiler feeding device Technical Field The utility model relates to the technical field of circulating fluidized bed boilers, in particular to a circulating fluidized bed boiler feeding device. Background The circulating fluidized bed boiler is a high-efficiency and low-pollution combustion technology, is widely applied to the fields of coal-fired power generation, industrial heat supply, waste treatment and the like, and is characterized in that fuel is combusted in a fluidized state, and high-efficiency heat transfer and pollution control are realized through a material circulating system, and the working principle is as follows: The bottom of the boiler is introduced with primary air, so that bed materials (quartz sand, limestone and the like) and fuel particles suspend in a hearth to form a fluid-like state, the fuel is mixed with air for combustion in the process, the combustion temperature is usually controlled to be 50-950 ℃ which is lower than that of a pulverized coal furnace, and the generation of thermal NOx is effectively reduced. In order to ensure smooth feeding of fuel, the prior circulating fluidized bed boiler can be crushed into smaller particles, the pressure in the boiler is suddenly increased due to deflagration when the smaller particles enter the boiler, and high-temperature flue gas reversely flows into a feeding pipe, so that the feeding device of the circulating fluidized bed boiler is provided. Disclosure of utility model The utility model aims to solve the problems in the background and provides a circulating fluidized bed boiler feeding device. The feeding device of the circulating fluidized bed boiler comprises a feeding pipe, wherein a pneumatic feeding assembly is arranged on the outer side of a discharging position of the feeding pipe and used for providing conveying power for fuel particles in the feeding pipe; The pneumatic feeding assembly comprises an outer connecting pipe, an air inlet pipe, a sliding sleeve, a conical plug and a discharge hole; The front end of the outer connecting pipe is fixedly communicated with the boiler; The air inlet pipe is fixed on the outer side of one end of the outer connecting pipe far away from the boiler and communicated with the inner cavity of the outer connecting pipe; The sliding sleeve is distributed on the inner side of the outer connecting pipe and sleeved on the outer side of the feeding pipe in a sliding manner, the conical plug is fixed at one end of the sliding sleeve and distributed at the front end of the feeding pipe, and the circumference of the discharge hole is formed in the periphery of the outer side of the sliding sleeve and communicated with the inner cavity of the sliding sleeve; High-pressure air is conveyed into the outer connecting pipe through the air inlet pipe and used for pushing the sliding sleeve, the conical plug and the discharge port to horizontally move so that the discharge port is communicated with the feeding pipe, and therefore the conduction of the conveying channel of the fuel particles is realized. As a still further scheme of the utility model, a conical reaming is formed at the position of the outer connecting pipe close to the conical plug, and the conical surface of the conical plug is jointed with the conical reaming to realize the plugging of the outer connecting pipe. As a still further scheme of the utility model, a fixed ring block is fixed on the outer side of the front end of the feeding pipe, and the outer wall of the fixed ring block is matched with the diameter of the inner wall of the sliding sleeve. As a still further scheme of the utility model, the conical plug is positioned on the inner side of the sliding sleeve and is provided with a conical bulge, and the conical bulge is attached to the front end of the feeding pipe and is used for realizing the front end blocking of the feeding pipe. As a still further proposal of the utility model, one end of the feeding pipe is provided with a central air pipe which horizontally penetrates into the feeding pipe, and one end of the central air pipe is close to the front end of the feeding pipe and is not contacted with the conical bulge of the conical plug. Compared with the prior art, the utility model has the beneficial effects that: Through setting up pneumatic feeding subassembly and the high-efficient feed of center trachea can realize the fuel granule, inside entering, deflagration because of the fuel granule of boiler leads to atmospheric pressure to increase suddenly, and is greater than the inside atmospheric pressure of outer connecting pipe, the toper stopper can reset under the inside atmospheric pressure of boiler promotes and stop up outer connecting pipe for avoid the inside air of boiler to contact with the inside fuel granule of feed pipe, guarantee the feed operation safety. Drawings FIG. 1 is a schematic diagram of the structure of the present utility model; FIG. 2 is a sectional view showing th