Ignition method for circulating fluidized bed boiler

A circulating fluidized bed and boiler technology, which is used in fluidized bed combustion equipment, combustion ignition, combustion methods, etc., can solve the problems of easy-to-condensed focus fire consumption, difficult ignition, large fuel oil, etc., to prevent the bed temperature from dropping sharply, The effect of preventing overheating and reducing heat loss

Active Publication Date: 2019-01-04
百色百矿发电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the start-up and operation of circulating fluidized bed boilers, there are common problems such as difficult ignition, easy overheating, easy coking, and large amount of fuel consumption for ignition.

Method used

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  • Ignition method for circulating fluidized bed boiler
  • Ignition method for circulating fluidized bed boiler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] See figure 2 , based on the above situation, Embodiment 1 of the present invention provides a kind of ignition method of circulating fluidized bed boiler, and this boiler obtains directly from the market, and the model is DG-1100 / 25.4-II1 supercritical once-through furnace, adopts single hearth, M type layout, balanced ventilation, intermediate reheating, all-steel frame structure, circulating fluidized bed combustion mode, high-temperature cooling cyclone separator is used for gas-solid separation, and before the ignition method of the present invention is adopted, the flow rate of the boiler material bed The ignition oil gun with a flow rate of 1200kg / h is replaced with an ignition oil gun with a flow rate of 2150kg / h. This ignition method comprises the following steps:

[0036] Ignition start: lay bed material on the hood of the air distribution board, the thickness of the bed material is 60-80cm, and adjust the primary air volume to 240,000 Nm 3 / h, do a fluidizat...

Embodiment 2

[0043] Embodiment 2 of the present invention provides an ignition method for a circulating fluidized bed boiler. The boiler is directly purchased from the market, and the model is DG-1100 / 25.4-II1 supercritical DC furnace, which adopts a single furnace, M-shaped layout, and balanced ventilation. 1. Intermediate reheating, all-steel frame structure, circulating fluidized bed combustion mode, adopting high-temperature cooling cyclone separator for gas-solid separation, before adopting the ignition method of the present invention, the boiler material bed flow rate is 2150kg / h The ignition oil gun is replaced with an ignition oil gun with a flow rate of 1200kg / h. This ignition method comprises the following steps:

[0044] Ignition start: Spread the bed material on the hood of the air distribution plate, the thickness of the bed material is 70cm, adjust the primary air volume to 250,000 Nm3 / h, conduct a fluidization test to ensure that the bed material is evenly fluidized, and the...

Embodiment 3

[0051] Embodiment 3 of the present invention provides an ignition method for a circulating fluidized bed boiler. The boiler is purchased directly from the market, and the model is DG-1100 / 25.4-II1 supercritical direct current furnace, which adopts a single furnace, M-shaped layout, and balanced ventilation. 1. Intermediate reheating, all-steel frame structure, circulating fluidized bed combustion mode, adopting high-temperature cooling cyclone separator for gas-solid separation, before adopting the ignition method of the present invention, the boiler material bed flow rate is 2150kg / h The ignition oil gun is replaced with an ignition oil gun with a flow rate of 1200kg / h. This ignition method comprises the following steps:

[0052] Ignition start: Spread the bed material on the hood of the air distribution board, the thickness of the bed material is 80cm, adjust the primary air volume to 260,000 Nm3 / h, conduct a fluidization test to ensure that the bed material is evenly fluidi...

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Abstract

The invention provides an ignition method for a circulating fluidized bed boiler. In the ignition start, the thickness of a bed material is 60-80 cm, a primary air volume is adjusted to 24-260,000 Nm3/h to ensure uniform fluidization of the bed material, after the fluidization of the bed material is uniform, the primary air volume is gradually reduced to 18,200,000 Nm3/h, so that the bed materialis in the bubbling bed state, an ignition oil pressure is adjusted to 1.2-1.4MPa, and an ignition oil gun with a flow rate of 1200kg/h is used for igniting; during the ignition heating process, more than 90% of primary air is heated by the ignition oil gun to reduce cold air entering a furnace to not cool the bed material; when the bed temperature rises to 420-440 DEG C, pulse coal injecting is conducted; when the bed temperature rises to 620-650 DEG C, the oil gun is gradually withdrawn, and after the combustion is stabilized, the primary air volume is adjusted to be no less than 240,000 Nm3/h to ensure normal fluidization of the bed material; when the bed temperature reaches 680-700 DEG C, coals are continuously injected, and normal combustion is entered. The ignition method can reduce the amount of fuels required for ignition.

Description

technical field [0001] The invention relates to the technical field of circulating fluidized bed boilers, in particular to an ignition method for circulating fluidized bed boilers. Background technique [0002] Supercritical circulating fluidized bed unit boiler has many advantages such as high efficiency, energy saving and low pollution, wide fuel adaptability, high combustion efficiency, high-efficiency desulfurization, low NOX emission, simple structure and convenient operation. The coal types in Baise Youjiang District generally have low calorific value and other characteristics, making the 2×350MW supercritical circulating fluidized bed unit the first unit in Guangxi Zhuang Autonomous Region. The ignition and start-up of circulating fluidized bed boiler system in the prior art mainly adopts diesel ignition. figure 1 As shown, it usually leads the oil pipe for fuel oil to the ignition oil gun located in the boiler air duct, the fuel oil system 20 and the compressed air ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/18F23Q13/00
CPCF23C10/18F23C2206/10F23Q13/00
Inventor 蒙保胜
Owner 百色百矿发电有限公司
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