CN201285030Y

CN201285030Y - Two-stage combination separating circulating fluidized bed boiler

Info

Publication number: CN201285030Y
Application number: CNU2008201588379U
Authority: CN
Inventors: 曹连新
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-10-21
Filing date: 2008-10-21
Publication date: 2009-08-05
Anticipated expiration: 2018-10-21

Abstract

The utility model discloses a two-stage combination-separation circulating fluid bed boiler comprising a fire wall, an integral hearth, a steam header, a first flow section of the hearth, a high temperature U-shaped separator consisting of a second flow section of the hearth and a third flow section of the hearth, a high temperature overheater, a lower temperature overheater, a high temperature coal economizer, a lower temperature coal economizer, a first-stage air preheater, a second-stage air preheater, a refeed device and a refeed pipe which are arranged at the lower part of the high temperature U-shaped separator, as well as a buried pipe, a grid plate and a wind chamber which are arranged below the first flow section in sequence, wherein the outlet of the third flow section of the hearth is provided with a cyclone separator, and the bottom end of the cyclone separator is provided with the refeed pipe which is communicated with the integral hearth and connected with the refeed device. The utility model has the advantages of high separation and combustion efficiency, long life cycle, low coal consumption, and the like and is suitable for industrial production.

Description

Two-stage combination separating cycle fluidized-bed combustion boiler

Technical field

The utility model relates to a kind of boiler plant, and the spy is a kind of two-stage combination separating cycle fluidized-bed combustion boiler.

Background technology

It is 0～10mm that CFBB is gone into the requirement of stove coal particle size, the coal grain of 0～10mm is divided into 0～3mm and two grades of 3～10mm again, 3～10mm coal grain burns at the lower furnace portion emulsion zone, 0～3mm coal grain burns at the upper furnace dilute-phase zone, with regard to general CFBB, 3～10mm coal grain all can fire saturating, so to account for that can the 0～3mm duff grain of coal grain ratio more than 60% fire be the key that determines boiler combustion efficiency.

As Chinese patent, the patent No. is 02223608.2, patent name is high, the patent of the low ciculation fluidized boiler of mixture velocity, the U type separator that constitutes by three flow processs, owing to limited by project organization, velocity of flue gas is low, so separative efficiency low (generally having only 40～50%), can only separate the above particle of 0.5mm, boiler combustion efficiency is low, the coal consumption height, and the disposable combustion share by burner hearth of 0～3mm particle generally has only 50%～80% (fixed by coal and structure), this part is disposable by burner hearth and do not burn, and can't catch again and get off to melt down thorax, therefore causes separative efficiency low.

The utility model content

The purpose of this utility model is to overcome the deficiency of prior art and a kind of separation, efficiency of combustion height is provided, and life cycle is long, the two-stage combination separating cycle fluidized-bed combustion boiler that coal consumption is low.

The purpose of this utility model is achieved by following technical proposals:

A kind of two-stage combination separating cycle fluidized-bed combustion boiler, comprise the furnace wall, whole burner hearth, drum, burner hearth first pass section, the U type high-temperature separator of forming by burner hearth second flow process section and burner hearth the 3rd flow process section, high, low temperature superheater, high, low-level (stack-gas) economizer, one-level, the secondary air preheater, be arranged on material-returning device and the refeed line and the pipe laying that is successively set on first pass section below of U type high-temperature separator bottom, air distribution plate and air compartment, the outlet of described burner hearth the 3rd flow process section is provided with cyclone separator, and the bottom of described cyclone separator is provided with the refeed line that is connected with material-returning device that is communicated with whole burner hearth.

Owing to adopt above-mentioned scheme, the utlity model has primary separator that constitutes by U type high-temperature separator and the second-stage separator that constitutes by cyclone separator, at first secondary cyclone can all can separate 〉=0.05mm particle preferably, therefore this two-stage combination isolating construction has remedied the defective of single-stage U type efficient cyclone preferably, combination separative efficiency height, the boiler combustion efficiency height, than the high 4-5 of the thermal efficiency percentage point of single-stage U type high-temperature separator boiler, and coal consumption is low; Secondly single-stage separator separation of material amount is many, the separator wearing and tearing are big, and easily produce the secondary poplar and analyse, two-stage combination isolating construction is that one-level U type high-temperature separator separates coarse granule, the secondary cyclone separate fine particles, so two-stage combination separates and has solved wearing and tearing and the secondary poplar that single-stage separates preferably and analyse problem; The two big factors whether the size decision circulatory system of last separator separation of material temperature and amount is stable, in general, single-stage high temperature separates because the separation temperature height, the recycle stock amount is big, easily produces coking when going into the variation of stove coal or using the low ash smelting point coal, and this structure one-level U type high temperature separating cycle material is few, secondary cyclonic separation recycle stock is many, and temperature than one-level low 50 ℃～100 ℃, the possibility of high-temperature coking reduces greatly, the continuous maneuverability of the safety and stability of the circulatory system is good.

In sum, described utility model, characteristics such as a kind of two-stage combination separating cycle fluidized-bed combustion boiler has separation, efficiency of combustion height, and life cycle is long, and coal consumption is low are suitable for industrial production.

Description of drawings

Figure is the structural representation of two-stage combination separating cycle fluidized-bed combustion boiler.

In the accompanying drawing, 1----high temperature superheater, 2----furnace wall, the whole burner hearth of 3----, the 4----burner hearth second flow process section, 5----burner hearth the 3rd flow process section, 6----burner hearth first pass section, 7----air distribution plate, 8----air compartment, 9----main air preheater, 10----material-returning device, 11----secondary air preheater, 12----low-level (stack-gas) economizer, 13----high-temperature economizer, 14----cyclone separator, 15----low temperature superheater, 16----drum, 17----refeed line, 18----pipe laying.

The specific embodiment

Below in conjunction with accompanying drawing, describe the specific embodiment of two-stage combination separating cycle fluidized-bed combustion boiler in detail.

As shown in the figure, two-stage combination separating cycle fluidized-bed combustion boiler, comprise furnace wall 2, whole burner hearth 3, drum 16, burner hearth first pass section 6, the U type high-temperature separator of forming by burner hearth second flow process section 4 and burner hearth the 3rd flow process section 5, high, low temperature superheater 1,15, high, low-level (stack-gas) economizer 13,12, one-level, secondary air preheater 9,11, be arranged on the material-returning device 10 and the refeed line 17 of U type high-temperature separator bottom, be successively set on the pipe laying 18 of burner hearth first pass section 6 belows, air distribution plate 7 and air compartment 8, the outlet of described burner hearth the 3rd flow process section 5 is provided with cyclone separator 14, and the bottom of described cyclone separator 14 is provided with the refeed line that is connected with material-returning device 10 17 that is communicated with whole burner hearth 3.

This shows, adopt primary separator that U-shaped high-temperature separator consists of in the utility model and by whirlwind The scheme of the two-stage combination isolating construction of the second-stage separator that separator consists of is than the U-shaped high-temperature separator of single-stage The high 4-5 of the thermal efficiency of boiler percentage point, have separation, efficiency of combustion height, life cycle is long, and coal consumption is low etc. Characteristics are suitable for industrial production.

Claims

1, a kind of two-stage combination separating cycle fluidized-bed combustion boiler, comprise furnace wall (2), whole burner hearth (3), drum (16), burner hearth first pass section (6), the U type high-temperature separator of forming by burner hearth second flow process section (4) and burner hearth the 3rd flow process section (5), high, low temperature superheater (1), (15), high, low-level (stack-gas) economizer (13), (12), one-level, secondary air preheater (9), (11), be arranged on the material-returning device (10) and the refeed line (17) of U type high-temperature separator bottom, be successively set on the pipe laying (18) of burner hearth first pass section (6) below, air distribution plate (7) and air compartment (8), it is characterized in that: the outlet of described burner hearth the 3rd flow process section (5) is provided with cyclone separator (14), and the bottom of described cyclone separator (14) is provided with the refeed line that is connected with material-returning device (10) (17) that is communicated with whole burner hearth (3).