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Low-ratio biomass circulating fluidized bed boiler and combustion method thereof

A technology of circulating fluidized bed and biomass fuel, which is applied in the direction of fluidized bed combustion equipment, combustion method, fuel burned in molten state, etc., and can solve tempering and output drop, slagging on the grate, coking of bed materials, etc. problems, achieve the effects of reducing power consumption, improving combustion efficiency, and less ash accumulation

Inactive Publication Date: 2011-10-19
湖南博茂节能环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a low-magnification biomass circulating fluidized bed boiler and its combustion method, in order to solve the above-mentioned existing layer combustion furnaces and circulating fluidized bed boilers in operation. Problems such as slag, bed material coking, tempering and output drop

Method used

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  • Low-ratio biomass circulating fluidized bed boiler and combustion method thereof
  • Low-ratio biomass circulating fluidized bed boiler and combustion method thereof
  • Low-ratio biomass circulating fluidized bed boiler and combustion method thereof

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specific Embodiment approach 1

[0023] Specific implementation manner one: such as Figure 1~2 As shown, the low-rate biomass circulating fluidized bed boiler of this embodiment includes a furnace body 10, a tail shaft flue 24, an economizer 17, an air preheater 18, a furnace door 3, a buried pipe 5, and biomass fuel Feeding port 7, secondary air port 8, bed material feeding pipe 23, drum 13, soot blower 14, medium temperature steam-cooled cyclone separator 15, feeder 19, first stage desuperheater 20 and second stage The desuperheater 21, the boiler also includes a middle air chamber 1, a side air chamber 2, a middle air distribution plate 1-1, a side air distribution plate 2-1, a slag discharge pipe 22, a seeding tuyere 6, a top intermediate temperature screen type The superheater 11, the high temperature convective heat exchanger 12 and the low temperature convective heat exchanger 16; the furnace body 10 is surrounded by a membrane water wall, and the furnace body 10 connects from the upper furnace body 10-...

specific Embodiment approach 2

[0033] Specific implementation manner two: such as image 3 As shown, the low-rate biomass circulating fluidized bed boiler of this embodiment eliminates the panel superheater, and arranges the low-temperature convection superheater 16 at the outlet of the furnace and before the medium-temperature steam-cooled cyclone 15, and the high-temperature superheater 12 is placed at the tail. In the upper part of the shaft flue, a desuperheater 25 (water spray or surface desuperheater) is arranged above the low-temperature convection superheater 16. The saturated steam is introduced from the drum 13 into the medium-temperature steam-cooled cyclone separator 15, and then enters the low-temperature convection superheater 16, the desuperheater 25 and the high-temperature convection superheater 12. The material of the high temperature convection through the heater 12 is TP347H, and the material of the low temperature convection through the heater 16 is 20g (medium temperature and medium pres...

specific Embodiment approach 3

[0034] Specific implementation manner three: such as Figure 1~3 As shown, the combustion method of the low-rate biomass circulating fluidized bed boiler burning biomass fuel described in this embodiment and the first or second embodiment is implemented according to the following steps:

[0035] Step 1: Add bed material with an average particle size of 0.6-0.8 mm from the bed material feeding pipe 23 to the furnace of the furnace body 10;

[0036] Step 2: Adopt the negative pressure feeding method: the biomass fuel is sent to the biomass fuel feed port 7 through the feeder, and the biomass fuel is sucked into the furnace by its own weight and the negative pressure in the furnace. Under the action of the sowing wind, the heavier biomass fuel is swept by the sowing wind during the falling process, and is dispersed in the lower dense phase area 4 to burn, and the fines are blown by the flue gas to the upper dilute phase area 9 to burn;

[0037] Step 3. Use a large furnace cross-section...

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Abstract

The invention relates to a low-ratio biomass circulating fluidized bed boiler and a combustion method thereof, relating to a circulating fluidized bed boiler and a combustion method thereof and solving the problems of difficult feeding, grate slagging, bed material coking, tempering and output reduction, and the like existing in the operation of traditional grate furnaces and circulating fluidized bed boilers. A middle air chamber corresponds to the middle of a dense-phase area at the lower part, lateral grid plates are arranged between a lateral air chamber and the dense-phase area at the lower part, and a medium-temperature steam-cooled cyclone separator is arranged at the joint between a flue shaft at the tail part and a health outlet of a boiler body, respectively communicated with the flue shaft and the health outlet and communicated with the dense-phase area at the lower part through a material returner. The method adopts a negative-pressure feeding manner so that the fluidization air velocity of a high-speed area of the dense-phase area at the lower part is 4-5 m / s, the fluidization air velocity of a low-speed area is 1.5-2.0 m / s, the temperature of the dense-phase area at the lower part is 650-780 DEG C, and the material circulation ratio is below 10. The invention is suitable for the biomass circulating fluidized bed boiler for an electric power plant.

Description

Technical field [0001] The invention relates to a circulating fluidized bed boiler and a combustion method thereof, in particular to a low-rate circulating fluidized bed boiler that burns biomass fuel and a combustion method thereof. Background technique [0002] my country’s "Renewable Energy Medium and Long-term Development Plan" proposes that by 2020 the installed capacity of biomass power generation will reach 24 million kilowatts. The next ten years will be a period of rapid development of the biomass direct-fired power generation industry. The power generation industry that uses crop straw on a large scale will Has flourished. [0003] The main types of domestic biomass power boilers include water-cooled vibrating grate furnaces imported from Denmark and domestic water-cooled vibrating grate furnaces, chain grate furnaces, reciprocating grate furnaces (they are collectively referred to as layer-fired boilers) and circulating fluidized bed boilers. [0004] The layer-fired boile...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C10/10F23C10/20F23C10/22
Inventor 别如山杨文
Owner 湖南博茂节能环保科技有限公司
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