CN207334719U

CN207334719U - A kind of circulating fluidized bed boiler

Info

Publication number: CN207334719U
Application number: CN201721401828.3U
Authority: CN
Inventors: 唐跃; 王志平; 何军; 刘庆; 陈帅男; 何启理; 刘启; 栗亚凯
Original assignee: XIANGTAN BOILER CO Ltd
Current assignee: XIANGTAN BOILER CO Ltd
Priority date: 2017-10-27
Filing date: 2017-10-27
Publication date: 2018-05-08
Anticipated expiration: 2027-10-27

Abstract

The utility model provides a kind of circulating fluidized bed boiler, and the heat transfer structure of burner hearth adds membrane wall to combine including pipe laying；Tail vertical well gas flue convection heating surface is in-line arrangement, and burner hearth is three backhauls, configures Secondary Air, and burner hearth uses inertial separation, low temperature cyclone separator in 530 degree is used outside burner hearth.Dust stratification, slagging, the etching problem of solution boiler, the guarantee continuous reliability of operation of boiler, energy conservation and environmental protection, operating cost are low.

Description

A kind of circulating fluidized bed boiler

Technical field

A kind of boiler is the utility model is related to, especially a kind of circulating fluidized bed boiler.

Background technology

The coal quality of Xinjiang Zhun Dong Coal Mine Areas has the characteristics that：（1）Higher moisture；（2）Medium calorific capacity；（3）Coal quality Bulk density is small；（4）Easily catch fire, easy to burn out；（5）Strong coking；（6）High basic metal content, strong contamination；（7）The ash of each ore deposit melts Point difference is bigger.At present, the factor that accurate eastern coal is applied to boiler maximum is restricted to be coking, stain and caused by because staiing Dust stratification.And cause the principal element of this problem to be still the coal-fired characteristic of itself, and high basic metal content in components of coal ash It is the maximum reason for causing boiler scaling, contamination and dust stratification.

In the boiler with the accurate eastern coal in combustion Xinjiang, all there is similar problem.The east that soot blower stains heating surface above West purging does not fall, and boiler scaling, back-end surfaces slagging, booster, high temperature corrosion are serious, uses or mix accurate this height of eastern coal of burning Slagging fouling characteristics have seriously affected boiler safety normal operation.Therefore it is the accurate eastern coal of burning to solve the problems, such as fouling and slagging Key.

The content of the invention

The purpose of this utility model is that, there is provided a kind of circulating fluidized bed boiler, the combustion especially suitable for the accurate eastern coal in Xinjiang Burn.

Implement the utility model the technical scheme adopted is that the heat transfer structure of burner hearth adds membrane wall to combine including pipe laying； Tail vertical well gas flue convection heating surface is coarse pitch in-line arrangement；Burner hearth is three return structures, configures Secondary Air；Burner hearth is using used Property separation, low temperature cyclone separator in 530 degree is used outside burner hearth.

（1）Burner hearth adds membrane wall combined type heat transfer structure using pipe laying, and reasonable Arrangement heating surface, ensures tail vertical well convection current Heating surface import fibre selection prevents afterbody convection heating surface dust stratification bonding, slagging, corrosion below 530 DEG C.

（2）Tail vertical well gas flue convection heating surface uses coarse pitch in-line arrangement, prevents dust stratification from putting up a bridge.

（3）Since accurate eastern ash content of coal is seldom, using pipe laying low circulation multiplying power combustion method, boiler need not add many stones Sand can meet normal operation.

（4）Burner hearth uses three return structures, extends burning residence time of the particle in stove.

（5）Using relatively low ignition temperature, burner hearth emulsion zone ignition temperature is kept in 850~900 DEG C or so scopes, and close Reason configuration Secondary Air, controls excess air coefficient, good low nitrogen burning condition is created to fine grained.

（6）Using medium temperature cyclone separator outside burner hearth inertial separation and stove, ensure not burning the multiple circulating combustion of particle, The thermal efficiency is improved as far as possible.

（7）Emulsion zone uses low fluidizing velocity（3~4m/s）, reduce abrasion.

（8）Using pipe laying heat transfer technology, heat transfer coefficient is improved, reduces fin panel casing heating surface area, it is overall to reduce boiler Steel consumes.

Contain substantial amounts of material in burner hearth, substantial amounts of material is carried to upper furnace by flue gas in combustion, passes through The separator of furnace outlet is arranged in, material and flue gas are separated, and by non-mechanical feeding-back valve by loopback of material to bed, Multiple circulating combustion.Since material concentration is high, there is very big thermal capacity and good material to mix, general per kilogram flue gas can Some kilograms of material is carried, these recycle stocks bring high heat transfer coefficient, make boiler heat load adjustable range wide, to fuel It is adaptable.

For circulating fluidized bed boiler running temperature between 850~900 DEG C, this is a preferable desulfurization temperature section, is used Desulfuration in furnace technology, desulfurizing agent is added into bed（Such as lime stone）, low temperature combustion is repeated through repeatedly circulation in fuel and desulfurizing agent Burning and desulphurization reaction, turbulent motion is violent in stove in addition, and the discharge capacity of SO2 substantially reduces.Recirculating fluidized bed uses low temperature at the same time Air stage feeding burns, and burning is carried out all the time under low excess air, thus greatly reduces the generation and discharge of NOX.Circulation Fluidized-bed combustion boiler also has high efficiency of combustion, can use that inferior fuel, boiler load modulability be good, lime-ash is easy to comprehensive profit With the advantages that, therefore worldwide developed rapidly.

Due to the particularity of the accurate eastern coal in Xinjiang, fouling and slagging is mainly solved the problems, such as.By experimental studies have found that quasi- east During smoke temperature of the coal below 530 DEG C, afterbody convection heating surface will not produce dust deposition substantially.

The beneficial effects of the utility model are, can solve the accurate eastern coal in burning in circulating fluid bed boiler Xinjiang well Dust stratification, slagging, etching problem, ensure the continuous reliability of operation of boiler.Using the accurate eastern coal in burning in circulating fluid bed boiler Xinjiang It is the type of furnace being well suited for, not only energy saving but also environmentally friendly, operating cost is low.

Brief description of the drawings

Fig. 1 is the utility model structure diagram.

Embodiment

Referring to Fig. 1, a high-pressure blast 14 enters air compartment 1 at exhanst gas outlet 15 by air preheater 12, and drum 7 is arranged Above burner hearth 5, material returning device 13 is set below the second backhaul of burner hearth 5 and the 3rd backhaul.

2 ignition temperature of emulsion zone of burner hearth 5 is at 850~900 DEG C, 10 convection heating surface import of tail vertical well, 9 fibre selection Below 530 DEG C, the heat transfer structure of burner hearth includes pipe laying 3 plus membrane wall 6 combines；10 convection heating surface of tail vertical well gas flue is big Pitch in-line arrangement；Burner hearth 5 is three return structures, configures Secondary Air；Burner hearth uses inertial separation, is used outside burner hearth in 530 degree Low temperature cyclone separator 8；The fluidizing velocity of emulsion zone 2 is 3 ~ 4m/s.

For burner hearth 5 using pipe laying 3 plus 6 combined type heat transfer structure of membrane wall, reasonable Arrangement heating surface, ensures tail vertical well convection current 9 fibre selection of heating surface import prevents 11 dust stratification bonding of afterbody convection heating surface, slagging, corrosion below 530 DEG C.

10 convection heating surface of tail vertical well gas flue uses coarse pitch in-line arrangement, prevents dust stratification from putting up a bridge.

Since accurate eastern ash content of coal is seldom, using pipe laying low circulation multiplying power combustion method, boiler need not add many quartz Sand can meet normal operation.

Burner hearth 5 uses three return structures, extends burning residence time of the particle in stove.

Using relatively low ignition temperature, burner hearth emulsion zone ignition temperature is kept in 850~900 DEG C or so scopes, and rationally Secondary Air is configured, controls excess air coefficient, good low nitrogen burning condition is created to fine grained.

Using medium temperature cyclone separator outside burner hearth inertial separation and stove, ensure not burning the multiple circulating combustion of particle, to the greatest extent The thermal efficiency may be improved.

Emulsion zone 2 uses low fluidizing velocity（3~4m/s）, reduce abrasion.

Using pipe laying heat transfer technology, heat transfer coefficient is improved, reduces fin panel casing heating surface area, reduces boiler overall steel Consumption.

Claims

A kind of 1. circulating fluidized bed boiler, it is characterised in that burner hearth includes pipe laying and membrane wall, the vertical well gas flue convection current of afterbody by Hot face is in-line arrangement, and burner hearth is three backhauls, configures Secondary Air；Burner hearth uses inertial separation, and low temperature in 530 degree is used outside burner hearth Cyclone separator.