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A Method for Ash Removal Applicable to Fluidized Bed Boiler

A fluidized bed boiler and fluidized bed technology, applied in the field of boiler equipment ash removal, can solve the problems of small output of circulating fluidized bed boilers, affecting heat exchange efficiency, and incomplete soot blowing, so as to improve the safety and effectiveness of use Good, low cost effect

Active Publication Date: 2018-01-05
HMEI THREAD CO LTD OF YINBIN SICHUAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The high-efficiency energy-saving two-speed circulating fluidized bed boiler disclosed in this patent document is ventilated through the primary air duct and the secondary air duct. Although it can blow away part of the ash particles adhering to the air preheater, it is difficult to blow to the air preheater. The soot in the center of the tube bundle of these heat exchange components is not completely blown, and the soot blowing effect is poor, which affects the heat exchange efficiency, resulting in low output and low efficiency of the entire circulating fluidized bed boiler

Method used

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  • A Method for Ash Removal Applicable to Fluidized Bed Boiler
  • A Method for Ash Removal Applicable to Fluidized Bed Boiler
  • A Method for Ash Removal Applicable to Fluidized Bed Boiler

Examples

Experimental program
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Effect test

Embodiment 1

[0049] see figure 1 , a method of ash removal suitable for fluidized bed boilers, comprising a sand loading step and a recovery step, there is a sand blasting step between the sand loading step and the recovery step, and the sand loading step refers to putting sand in a sand In the sand bucket 1 of the soot blowing device; the sand blasting step refers to putting the sand in the sand bucket 1 into the sand blaster of the sand soot blowing device, and the sand blaster sprays the sand into the tail shaft 2 of the fluidized bed boiler In; the recovery step refers to the sand sprayed into the tail shaft 2 to flush the superheater 3, the economizer 4 and the air preheater 5 and then flow into the fluidized bed 6 of the sand soot blowing device, and then connect to the fluidized bed The auger 7 on the 6 reclaims the sand.

[0050] This embodiment is the most basic implementation mode. There is also a sandblasting step between the sand loading step and the recovery step. The sand lo...

Embodiment 2

[0052] see figure 1 , a method of ash removal suitable for fluidized bed boilers, comprising a sand loading step and a recovery step, there is a sand blasting step between the sand loading step and the recovery step, and the sand loading step refers to putting sand in a sand In the sand bucket 1 of the soot blowing device; the sand blasting step refers to putting the sand in the sand bucket 1 into the sand blaster of the sand soot blowing device, and the sand blaster sprays the sand into the tail shaft 2 of the fluidized bed boiler In; the recovery step refers to the sand sprayed into the tail shaft 2 to flush the superheater 3, the economizer 4 and the air preheater 5 and then flow into the fluidized bed 6 of the sand soot blowing device, and then connect to the fluidized bed The auger 7 on the 6 reclaims the sand.

[0053] The blasting speed in the blasting step is 5 g / s.

[0054] The sandblasting frequency in the sandblasting step is 3 times / hour.

[0055] Described sand...

Embodiment 3

[0059] see figure 1 , a method of ash removal suitable for fluidized bed boilers, comprising a sand loading step and a recovery step, there is a sand blasting step between the sand loading step and the recovery step, and the sand loading step refers to putting sand in a sand In the sand bucket 1 of the soot blowing device; the sand blasting step refers to putting the sand in the sand bucket 1 into the sand blaster of the sand soot blowing device, and the sand blaster sprays the sand into the tail shaft 2 of the fluidized bed boiler In; the recovery step refers to the sand sprayed into the tail shaft 2 to flush the superheater 3, the economizer 4 and the air preheater 5 and then flow into the fluidized bed 6 of the sand soot blowing device, and then connect to the fluidized bed The auger 7 on the 6 reclaims the sand.

[0060] The blasting speed in the blasting step is 6 g / s.

[0061] The sandblasting frequency in the sandblasting step is 4 times / hour.

[0062] Described sand...

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Abstract

The invention discloses an ash removal method suitable for a fluidized bed boiler, and belongs to the technical field of ash removal of boiler equipment. The ash removal method suitable for the fluidized bed boiler comprises a sand loading step and a recycling step, and is characterized in that a sand blasting step is carried out between the sand loading step and the recycling step; in the sand loading step, sand is loaded in a sand hopper of a sand ash blower; in the sand blasting step, the sand in the sand hopper is placed in a sandblast of the sand ash blower, and is sprayed in a shaft at the tail of the fluidized bed boiler by the sandblast; and in the recycling step, after scouring a superheater, an economizer and an air pre-heater, the sand sprayed in the shaft at the tail flows into a fluidized bed of the sand ash blower, and is recycled via an auger connected to the fluidized bed. By the ash removal method suitable for the fluidized bed boiler, ash is removed by the sand, the ash on a heat exchange component in the shaft at the tail can be removed effectively, the boiler steam rate is increased, and efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of ash removal for boiler equipment, in particular to an ash removal method suitable for fluidized bed boilers. Background technique [0002] The circulating fluidized bed boiler adopts a single drum and natural circulation mode, and is generally divided into two shafts at the front and the rear. The front shaft is a general suspension structure, surrounded by membrane water cooling walls. From bottom to top, it is the primary air chamber, dense phase area, and dilute phase area. The tail shaft adopts a supporting structure, and the two shafts are connected by a vertical cyclone separator, and the lower part of the separator is connected with a return device and an ash cooler. The interior of the combustion chamber and the separator are equipped with anti-wear linings, the front shaft is equipped with an Ao tube furnace wall, an external metal guard plate is used, and the tail shaft is equipped with a ligh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C10/24
CPCF23C10/24F23C2206/00
Inventor 张西平蒋文斌李涛冯静熊孝勇
Owner HMEI THREAD CO LTD OF YINBIN SICHUAN
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