CN107057771A

CN107057771A - A kind of Two-way Cycle Circulating Fluidized Bed Gasifier For Biomass

Info

Publication number: CN107057771A
Application number: CN201710501677.7A
Authority: CN
Inventors: 别如山; 陈佩; 曹森; 张孝禹; 张里华
Original assignee: Harbin Institute of Technology
Current assignee: Harbin Institute of Technology
Priority date: 2017-06-27
Filing date: 2017-06-27
Publication date: 2017-08-18

Abstract

A kind of Two-way Cycle Circulating Fluidized Bed Gasifier For Biomass, belong to biomass gasification technology field, further increase the gasification efficiency of biomass, it includes gasification furnace, primary cyclone, secondary cyclone and three-stage cyclone separator, burner hearth exhanst gas outlet on the upside of gasification furnace is connected by the import of accelerating sections and primary cyclone, the outlet of primary cyclone bottom is connected by one-level feeding back device with the burner hearth of gasification furnace, outlet at the top of primary cyclone is connected by the import of accelerating sections and secondary cyclone, outlet at the top of secondary cyclone is connected by the import of accelerating sections and three-stage cyclone separator, the outlet of secondary cyclone bottom is connected by two grades of feeding back devices with the burner hearth of gasification furnace；The outlet of three-stage cyclone separator bottom is connected with ash collecting device；The primary cyclone, secondary cyclone and three-stage cyclone separator use circulation whirlwind separator；The present invention is used for gasification of biomass.

Description

A kind of Two-way Cycle Circulating Fluidized Bed Gasifier For Biomass

Technical field

The invention belongs to biomass gasification technology field, and in particular to a kind of Two-way Cycle Biomass Gasification in Circulating Fluidized Bed Stove.

Background technology

China is large agricultural country, and biomass energy reserves enrich, occupied an important position in whole energy resource system very much, and And with good development prospect；Gasification of biomass is to carry out thermochemical study to biomass, produces a kind of skill of fuel gas Art, is the important channel of biomass utilization, and its principle is that biomass is carried out into imperfect combustion under anoxic conditions, is produced small CO, H of molecule₂、CH₄Deng fuel gas, have the advantages that environmental protection and utilization rate are higher；Recirculating fluidized bed is due to stable, just It is the biomass gasification device generally used at present, but gasification of biomass is carried out using existing recirculating fluidized bed in regulation When residual carbon content be up to ten to five 12 percent, remaining carbon is higher, and the carbon containing combustible gas scale of construction for showing to produce is lower, i.e. biology The gasification efficiency of matter is lower, and this programme is researched and developed to further improve the gasification efficiency of biomass；Practice have shown that, it is existing Circle fluidized-bed gasification furnace residual carbon content it is high the reason for be：The material of only one of which separator separation participates in circulation, circulation times Rate is relatively low, such as the patent No.（Publication number）For：201120162620.7（CN202072674U）、201320525708.X （CN203513612U）、201420134817.3（CN203741284U）、201620854679.5（CN205917216U）Institute is public The gasification furnace opened；Because biomass is very light, one cyclonic separative efficiency is relatively low, in order to improve total efficiency of separation, the patent No.（It is open Number）For：201310294080.1（CN103320174A）Disclosed gasification furnace adds cyclone separator serial number, but should Patent is gasified in the dipleg of second separator separation ash the first separator of feeding by first return material valve for separator feeding It is bulky because biomass ash bulk density is small in stove, cause feed back difficult, be frequently occluded so that the second separator is separated Ash smooth can not be returned in the first separator dipleg, so as to cause the second separator ineffective；In addition, all of above patent is equal Using conventional cyclones, the resistance of each separator is for one kPa to 1,500 handkerchiefs, and resistance is excessive, and air-introduced machine power consumption is big Width increase, performance driving economy declines.

The content of the invention

Followed the invention aims to the gasification efficiency for further improving biomass there is provided a kind of Two-way Cycle biomass Ring fluidized-bed gasification furnace, its technical scheme is as follows：

A kind of Two-way Cycle Circulating Fluidized Bed Gasifier For Biomass, it includes gasification furnace, primary cyclone, two grades of cyclonic separations Burner hearth exhanst gas outlet on the upside of device and three-stage cyclone separator, gasification furnace is connected by the import of accelerating sections and primary cyclone Connect, the outlet of primary cyclone bottom is connected by one-level feeding back device with the burner hearth of gasification furnace, primary cyclone The outlet at top is connected by the import of accelerating sections and secondary cyclone, and the outlet at the top of secondary cyclone is by adding The import connection of fast section and three-stage cyclone separator, the outlet of secondary cyclone bottom passes through two grades of feeding back devices and gasification The burner hearth connection of stove, primary cyclone and the secondary cyclone feed back all directly into burner hearth, can guarantee that feed back is smooth； The primary cyclone, secondary cyclone and three-stage cyclone separator use circulation whirlwind separator, circulation The structure of formula cyclone separator is CN2577970Y by notification number, and the patent of entitled circumfluent cyclone is disclosed, ring Streaming cyclone separator uses the structure of circumfluent cyclone, separative efficiency high advantage small with windage, three separation Handkerchief of total windage about 1,800 of device or so, only about 1/2nd or so of three conventional cyclones.

Beneficial effects of the present invention are：Using double circulation structure, loop sets reasonable, and feed back is smooth, and further reduction flies Grey carbon left, improves gasification efficiency；The cyclone separator windage used is small, and separative efficiency is high, and through experiment, carbon residue in flying ash is low In 1 15.

Brief description of the drawings：

Fig. 1 is overall structure diagram of the present invention.

Embodiment：

Reference picture 1, a kind of Two-way Cycle Circulating Fluidized Bed Gasifier For Biomass, it includes gasification furnace 1, primary cyclone 2, two Level cyclone separator 3 and three-stage cyclone separator 4, the burner hearth exhanst gas outlet of the upside of gasification furnace 1 pass through accelerating sections and one cyclonic The import connection of separator 2, the outlet of the bottom of primary cyclone 2 is connected by the burner hearth of one-level feeding back device 5 and gasification furnace 1 Logical, the outlet at the top of primary cyclone 2 is connected by accelerating sections with the import of secondary cyclone 3, two grades of whirlwind point Outlet from the top of device 3 is connected by accelerating sections with the import of three-stage cyclone separator 4, and the bottom of secondary cyclone 3 goes out Mouth is connected by two grades of feeding back devices 6 with the burner hearth of gasification furnace 1, and primary cyclone 2 and secondary cyclone 3 are all direct The feed back into burner hearth, can guarantee that feed back is smooth；The primary cyclone 2, secondary cyclone 3 and three-stage cyclone separation Device 4 uses circulation whirlwind separator, and the structure of circulation whirlwind separator is CN2577970Y by notification number, entitled The patent of circumfluent cyclone is disclosed, and circulation whirlwind separator uses the structure of circumfluent cyclone, with wind Small, the high advantage of separative efficiency, the handkerchief of total windage about 1,800 of three separators or so are hindered, only about three conventional whirlwind / 2nd or so of separator.

The outlet of the bottom of three-stage cyclone separator 4 is connected with ash collecting device 7, is produced for biomass collection after-flame Flying dust carries out secondary utilize.

The outlet at the top of three-stage cyclone separator 4 is connected with fuel gas combustion equipment 8, available for combustion power generation or generation steam Heat supply etc..

Claims

1. a kind of Two-way Cycle Circulating Fluidized Bed Gasifier For Biomass, it comprising gasification furnace (1), primary cyclone (2), two grades Burner hearth exhanst gas outlet on the upside of cyclone separator (3) and three-stage cyclone separator (4), gasification furnace (1) passes through accelerating sections and one-level The import connection of cyclone separator (2), the outlet of primary cyclone (2) bottom passes through one-level feeding back device (5) and gasification The burner hearth connection of stove (1), outlet at the top of primary cyclone (2) is entered by accelerating sections and secondary cyclone (3) Outlet at the top of mouth connection, secondary cyclone (3) is connected by accelerating sections with the import of three-stage cyclone separator (4), its It is characterised by that the outlet of secondary cyclone (3) bottom is connected by two grades of feeding back devices (6) with the burner hearth of gasification furnace (1)； The primary cyclone (2), secondary cyclone (3) and three-stage cyclone separator (4) are using circulation whirlwind point From device, circulation whirlwind separator uses the structure of circumfluent cyclone.

2. a kind of Two-way Cycle Circulating Fluidized Bed Gasifier For Biomass as claimed in claim 1, it is characterised in that three-stage cyclone separation The outlet of device (4) bottom is connected with ash collecting device (7).

3. a kind of Two-way Cycle Circulating Fluidized Bed Gasifier For Biomass as claimed in claim 1, it is characterised in that three-stage cyclone separation Outlet at the top of device (4) is connected with fuel gas combustion equipment (8).