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Pure-burning biomass environment-friendly circulating fluidized bed high-temperature and high-pressure steam boiler

A circulating fluidized bed, high temperature and high pressure technology, used in steam boilers, steam generation, lighting and heating equipment, etc., can solve the problems of narrow fuel range, high pollution emissions, low combustion efficiency, etc., to achieve a large combustion share, prevent smoke The effect of gas back channeling and raising the height of the furnace

Pending Publication Date: 2020-02-14
哈尔滨红光锅炉总厂有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the problems of low combustion efficiency, high pollution discharge, narrow fuel range, difficulty in pure combustion, poor feeding, poor sealing and poor reliability in existing biomass circulating fluidized bed boilers, and further provides a pure biomass boiler. Biomass-burning environment-friendly circulating fluidized bed high temperature and high pressure steam boiler

Method used

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  • Pure-burning biomass environment-friendly circulating fluidized bed high-temperature and high-pressure steam boiler
  • Pure-burning biomass environment-friendly circulating fluidized bed high-temperature and high-pressure steam boiler
  • Pure-burning biomass environment-friendly circulating fluidized bed high-temperature and high-pressure steam boiler

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specific Embodiment approach 1

[0047] Specific implementation mode one: as Figure 1-11 As shown, the purely burning biomass environment-friendly circulating fluidized bed high-temperature and high-pressure steam boiler in this embodiment includes a purely burning biomass feeding system 1, an ignition device 2, an ash discharge device 3, a furnace 4, a separation and return system 5, Wall cladding superheater 6, air preheater 7, environmental protection interface 8, water supply header 9, economizer 10, water supply distribution pipe 11, drum 12, concentrated descending pipe 13, water cooling screen descending pipe 14, water cooling screen 15, Water-cooled screen outlet pipe 16, water-cooled steam guide pipe 20, steam outlet pipe 21, side wall 22, front wall 23, rear wall 24, low-temperature superheater 25, primary spray desuperheater 26, medium-temperature superheater 27 , two-stage water spray desuperheater 28, medium temperature screen superheater 29, three-stage water spray desuperheater 30, high temper...

specific Embodiment approach 2

[0075] Specific implementation mode two: as figure 1 , Figure 5 with Figure 7 As shown, the cross-section of the feeding interface 1-1 in this embodiment is rectangular, the cross-sectional size of the feeding interface 1-1 is 800x800mm, the feeding interface 1-1 is set downwardly, and the downward inclination angle a of the feeding interface is 10-15°, the zero pressure point is set between the feeding interface 1-1 and the lower secondary air outlet 1-2.

[0076] This design is convenient for feeding and avoiding accumulation; the zero pressure point is between the biomass feed port 1-1 and the next secondary air port 1-2, which realizes negative pressure feeding of biomass, and negative pressure is beneficial to lighter biomass Feeding, because the density of biomass is small, positive pressure feeding is easy to cause external spray and pollute the environment. Other components and connections are the same as those in the first embodiment.

specific Embodiment approach 3

[0077] Specific implementation mode three: as figure 1 , Figure 5 with Figure 7 As shown, the quantity of the ash discharge pipe 3-1 in this embodiment is three, the diameter of the ash discharge pipe 3-1 is Φ273mm, the quantity of the slag discharge pipe 3-2 is two, and the diameter of the slag discharge pipe 3-2 is Φ325mm.

[0078] With this design, the ash discharge pipe 5-1 adopts a Φ273mm diameter pipe to discharge the fine ash after biomass combustion, and adopts a small amount of multiple rows to avoid local ash coking to form slag; the slag discharge pipe 5-2 adopts a Φ325mm diameter pipe, large The pipe diameter can smoothly discharge small slag lumps and unburned impurities and sundries that enter the furnace with biomass, which can prevent slag blocking and effectively avoid accidental shutdown due to poor slag discharge. Other compositions and connections are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a pure-burning biomass environment-friendly circulating fluidized bed high-temperature and high-pressure steam boiler, and relates to a circulating fluidized bed boiler. The boiler solves the problems of low in combustion efficiency, high in pollution emission, narrow in fuel range, difficulty in pure combustion, unsmooth feeding, poor sealing and poor reliability of an existing biomass circulating fluidized bed boiler. A feeding interface is positioned at a negative pressure point at the lower part of a hearth; the upper part of the hearth is sequentially provided witha water cooling screen, a middle temperature screen superheater and a high temperature screen superheater from the width direction; a first inlet flue communicates one end of a second inlet flue; thefirst inlet flue and the second inlet flue are all inclined downwards; an inclination angle of the first inlet flue is smaller than that of the second inlet flue; the other end of the second inlet flue communicates with the side wall of the upper end of a separator; the lower end of a steering chamber communicates with the upper end of the separator; a central cylinder is connected with the lowerend of the steering chamber; and the central cylinder is positioned in the separator. The boiler is used for cogeneration and power generation of a pure-burning biomass circulating fluidized bed boiler.

Description

technical field [0001] The invention relates to a biomass circulating fluidized bed boiler, in particular to an environment-friendly circulating fluidized bed high temperature and high pressure steam boiler purely burning biomass. Background technique [0002] According to the requirements of the "Guiding Opinions on Promoting the Development of Biomass Energy Heating" issued by the state, as well as the implementation of coal restrictions and bans in some areas of our country, the development of biomass circulating fluidized bed boilers has been accelerated, which needs to achieve clean combustion and low consumption. Pollution discharge and load stability and safe operation. Open-air burning and storage of agricultural and forestry biomass can cause damage to the environment such as smog and fire; improper disposal of animal husbandry waste can cause pollution to natural resources. [0003] With the increasing strictness and improvement of environmental protection and ene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22B31/00F22B31/08
CPCF22B31/0069F22B31/08
Inventor 张福强
Owner 哈尔滨红光锅炉总厂有限责任公司
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