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CN-224215325-U - Adjusting device for biomass circulating fluidized bed boiler material returning device

CN224215325UCN 224215325 UCN224215325 UCN 224215325UCN-224215325-U

Abstract

The utility model discloses a biomass circulating fluidized bed boiler material returning device which comprises a material returning device body, wherein the material returning device body consists of two air chamber parts with independent functions, each air chamber part comprises a fluidization air chamber and a material returning air chamber, a discharging inclined pipe of the material returning device body is fixedly connected with a circulating fluidized bed boiler, a vertical pipe on the material returning device body is connected with a cyclone separator, the material returning device body comprises a driving and adjusting structure, the driving and adjusting structure comprises a fluidization air pipe and a material returning air pipe which are respectively connected with the fluidization air chamber and the material returning air chamber, the driving and adjusting structure further comprises an independent side blowing pipe bypass, the independent side blowing pipe bypasses the side of the fluidization air pipe to be fed into the material returning device body, the fluidization air pipe and the material returning air pipe are led in from the bottom of the material returning device body, and the fluidization air pipe and the material returning air pipe are respectively connected with an external fan.

Inventors

  • LI XU

Assignees

  • 大庆市庆翔热电有限公司

Dates

Publication Date
20260508
Application Date
20250605

Claims (7)

  1. 1. The biomass circulating fluidized bed boiler material returning device is characterized by comprising a material returning device body (1), wherein the material returning device body (1) consists of two air chamber parts with independent functions, each air chamber part comprises a fluidization air chamber (2) and a material returning air chamber (3), a discharging inclined pipe of the material returning device body (1) is fixedly connected with a circulating fluidized bed boiler, and a vertical pipe on the material returning device body (1) is connected with a cyclone separator; The material returning device comprises a material returning device body (1) and a material returning device, wherein the material returning device body (1) comprises a driving and adjusting structure, and the driving and adjusting structure comprises a fluidization air pipe (4) and a material returning air pipe (5) which are respectively connected with the fluidization air chamber (2) and the material returning air chamber (3); The driving adjusting structure further comprises an independent side blowing pipe bypass (10), and the independent side blowing pipe bypass (10) is fed into the material returning device body (1) from the side surface of the fluidization air pipe (4).
  2. 2. The biomass circulating fluidized bed boiler return regulator according to claim 1, wherein the fluidization air pipe (4) and the return air pipe (5) are led in from the bottom of the return body (1), and the fluidization air pipe (4) and the return air pipe (5) are respectively connected with an external fan (6); An air distribution plate (7) is arranged in each of the fluidization air chamber (2) and the material returning air chamber (3), an air cap (8) is arranged on the air distribution plate (7), and regulating valves (9) are arranged on the fluidization air pipes (4) and the material returning air pipes (5); the independent side blowing pipe bypass (10) is arranged on one side of the fluidization air chamber (2) of the material returning device body (1).
  3. 3. The biomass circulating fluidized bed boiler return regulator according to claim 2, wherein a baffle is arranged on the return body (1), the baffle comprises a first baffle (11) and a second baffle (12), and the first baffle (11) is close to a vertical pipe and aligned with the boundary of an air distribution plate (7) on the fluidization air pipe (4); the second partition plate (12) is positioned on one side of the discharging inclined tube and extends upwards.
  4. 4. The device for adjusting the return feeder of the biomass circulating fluidized bed boiler according to claim 3, wherein the upper end surface of the second partition plate (12) and the lower end surface of the first partition plate (11) are positioned on the same horizontal line; Or the upper end surface of the second clapboard (12) and the lower end surface of the first clapboard (11) are not positioned on the same horizontal line.
  5. 5. The device for adjusting the return feeder of the biomass circulating fluidized bed boiler according to claim 4, wherein an inclined surface (13) is arranged at the position of the return air chamber (3) corresponding to the discharging inclined pipe.
  6. 6. The device for adjusting the return feeder of the biomass circulating fluidized bed boiler according to claim 5, wherein the width of the return air chamber (3) is 2 times of the width of the fluidization air chamber (2).
  7. 7. The biomass circulating fluidized bed boiler return feeder adjusting device according to claim 6, wherein a rotameter is arranged on the fluidization air pipe (4) and the return air pipe (5); The independent side blow pipe bypass (10) is provided with a rotameter.

Description

Adjusting device for biomass circulating fluidized bed boiler material returning device Technical Field The utility model belongs to the technical field of biomass circulating fluidized bed boilers, and particularly relates to a device for adjusting a return feeder of a biomass circulating fluidized bed boiler. Background The circulating fluidized bed boiler system is generally composed of a hearth, a separator, a material returning device, a tail heating surface, auxiliary equipment and the like, wherein the hearth, the separator and the material returning device form a material circulating system, fine solid particles carried out of the hearth by flue gas are separated by the separator and then returned to the hearth by the material returning device for circulating combustion, so that the combustion efficiency of the boiler is improved. The device has the functions of ensuring that circulating materials are conveyed from a negative pressure area to a positive pressure area and sealing the hearth flue gas from passing through a fly ash circulating loop back-channeling separator. The material returning device is formed by sequentially connecting a descending section (vertical pipe) with a circular cross section, a rectangular ascending section and a material returning pipe, wherein the descending section is communicated with the separator, the material returning pipe is communicated with the hearth, a tongue plate is arranged between the descending section and the ascending section, the lower parts of the descending section and the ascending section are communicated, an overflow weir is arranged between the ascending section and the material returning pipe, the upper parts of the ascending section and the material returning pipe are communicated, a material returning bed is arranged at the lower parts of the descending section and the ascending section, a material returning air chamber is arranged at the lower part of the material returning bed, high-temperature circulating ash collected from the high-temperature separator is accumulated in the riser pipe of the material returning device to seal the material level with a certain height so as to prevent the hearth smoke from reversely flowing into the separator, and a material returning fan is adopted to fluidize the material collected by the separator at the bottom of the material returning bed under the action of pressure difference of the vertical pipe and the hearth. When ash flows through a riser of a material returning device with smaller drift diameter, ash coking is easy to occur, a material returning device is blocked by cold and the normal operation of a boiler is influenced due to bridging, and because a hood on a U-shaped material returning device bed which is mostly adopted in the prior art is uniformly arranged, return air is fed from one side, so that the condition that left side pressure is smaller than right side pressure in an air chamber is caused, that is, the output air quantity of the left hood on the bed is smaller than right side pressure, after half a year or longer of operation, the aperture on the hood is ground, the condition that the left side pressure is smaller than right side pressure in the air chamber is more outstanding, and when the left side pressure is reduced to a certain degree, the ash accumulation phenomenon can occur on the upper part of a baffle plate and the inner side of the baffle plate of the U-shaped material returning device. In view of the above factors, the provided biomass circulating fluidized bed boiler material returning device is provided with the independent side blowing pipe bypass which plays a driving role in controlling and adjusting the operation of the fluidized bed material returning device and the circulating amount of solid particles, and provides main driving force for the solid particles to pass through the orifice. Disclosure of utility model The utility model aims to provide a biomass circulating fluidized bed boiler return feeder adjusting device for solving the problems in the background technology. The utility model aims at realizing the technical scheme that the biomass circulating fluidized bed boiler material returning device comprises a material returning device body, wherein the material returning device body consists of two air chamber parts with independent functions, each air chamber part comprises a fluidization air chamber and a material returning air chamber, a discharging inclined pipe of the material returning device body is fixedly connected with a circulating fluidized bed boiler, and a vertical pipe on the material returning device body is connected with a cyclone separator; The material returning device body comprises a driving and adjusting structure, and the driving and adjusting structure comprises a fluidization air pipe and a material returning air pipe which are respectively connected with the fluidization air chamber and the material returning air chamber; the d