CN212691741U

CN212691741U - Be applicable to CFB changes gas furnace flue structure

Info

Publication number: CN212691741U
Application number: CN202021173692.7U
Authority: CN
Inventors: 汪会林; 谷东梅; 黄科义; 赵兵
Original assignee: China Western Power Industrial Co Ltd
Current assignee: China Western Power Industrial Co Ltd
Priority date: 2020-06-22
Filing date: 2020-06-22
Publication date: 2021-03-12
Anticipated expiration: 2030-06-22

Abstract

The utility model discloses a be applicable to CFB changes gas furnace flue structure, including the cyclone flue, the cyclone flue includes cyclone main part, cyclone main part lateral part sets up the flue entry, cyclone main part top sets up the flue export, be provided with first thermal-insulated inside lining on the cyclone main part inner wall, cyclone main part bottom feed back wind channel entrance sets up seal structure. The cyclone separator which loses efficacy in the circulating fluidized bed boiler CFB is changed into a part of the flue by the flue structure, and the flue structure is combined with the original CFB flue structure, so that the problems of flue gas retention and channeling are solved, and meanwhile, the original flue structure and the heat exchange area are fully utilized.

Description

Be applicable to CFB changes gas furnace flue structure

Technical Field

The utility model belongs to the technical field of boiler structure, concretely relates to be applicable to CFB changes gas furnace flue structure.

Background

A circulating vulcanizing boiler (CFB) belongs to a fluidized bed boiler, and is a novel combustion device with a combustion mode between layered combustion and suspension combustion, wherein the combustion boiler is in a boiling state like boiling boiled water, and primary material returning and secondary material returning are designed to improve the boiler efficiency. Circulating fluidized bed boilers are the mode of operation of boilers currently used by most businesses and already exist in the business. Because the fuel in the circulating fluidized bed only accounts for 1-3% of the bed material, any fuel can be combusted without auxiliary fuel, various inferior coals and other combustible materials can be combusted, particularly coal gangue, high-sulfur coal, high-ash coal, high-moisture coal, coal slime, garbage and the like are included, and the problem of troublesome environmental pollution can be solved. The combustion efficiency reaches more than 97%. The desulfurization mode is one of the most economical modes, and the desulfurization rate reaches more than 90 percent. However, the existing circulating fluidized boilers also have certain drawbacks: because of the influence of air coefficient, carbon monoxide produced after the coal burns, residual carbon in the ash are discharged along with tail gas after not burning for further, one part of heat is taken away, and the other part of carbon monoxide and residual carbon can be further burnt to release heat, so that energy is wasted, and sulfur, carbon monoxide and carbon smoke particles in tail gas emission are more, so that the effects of desulfurization and nitrogen oxide removal are not good in coal water slurry, pollution is caused to the environment, and the environment-friendly policy of a pot frame is not met.

Therefore, the boiler needs to be modified, and the modification of a circulating fluidized bed boiler (CFB) into a gas boiler is a modification scheme, but in the modification project of the CFB for modifying the combustion of natural gas, the original flue gas of the CFB goes out of a hearth, is separated by a separator, then enters a rear vertical shaft from the upper end of the separator, and carries materials to enter a material returning flow downwards from the separator and then returns to the hearth. And no longer take the ash in the flue gas after the gas transformation, thereby the flue gas stroke has taken place to change and has leaded to CFB stove cyclone separator device function inefficacy, and the flue gas that no longer takes the ash after the gas transformation gets into the separator after one step and divides to leave by the separator export rapidly, partly is detained in the separator, is inhaled back furnace during the pressure fluctuation to cause the flue gas to detain the hidden danger of backward flow even.

SUMMERY OF THE UTILITY MODEL

The utility model provides a technical problem be: the utility model provides a cyclone that is applicable to CFB changes gas furnace flue structure, and this flue structure loses the efficiency in with circulation fluidized bed boiler CFB changes the flue into partly, combines original CFB flue structure, solves the problem that the flue gas is detained, the cross flow simultaneously make full use of original flue structure and heat transfer area.

The utility model adopts the technical scheme as follows:

the utility model provides a be applicable to CFB changes gas furnace flue structure, includes the cyclone flue, the cyclone flue includes cyclone main part, cyclone main part lateral part sets up the flue entry, cyclone main part top sets up the flue export, be provided with first thermal-insulated inside lining on the cyclone main part inner wall, cyclone main part bottom returning charge wind channel entrance sets up seal structure.

Preferably, a flue outlet of the flue of the cyclone separator is communicated with the vertical shaft.

Preferably, the sealing structure comprises a sealing guard plate arranged at the inlet of the return air duct, and a second heat insulation lining is laid on the side face, arranged in the cyclone main body, of the sealing guard plate.

Preferably, the heat insulation lining on the closed guard plate and the heat insulation lining on the inner wall of the cyclone main body are provided with expansion fillers at the gap position.

Preferably, the second heat insulation lining is cast and molded by adopting heat insulation casting materials or heat insulation casting materials.

Preferably, the expansion filler includes any one of asbestos cord or alumina silicate fiber cotton cord.

The utility model discloses a be applicable to CFB and change gas furnace flue structure, the part of flue structure is reformed transform into with CFB stove cyclone device of functional failure, it cuts off at the returning charge riser of returning charge wind channel entrance to be about to cyclone, then it is sealed, make its original flue structure with the CFB stove form new CFB together and change gas furnace flue structure, the mode of should reforming transform is simple, do not need a large amount of manpowers, old flue is demolishd to the material resources, build new gas furnace flue by laying bricks or stones, just can solve the flue structure and solve the flue gas delay, the problem of crossflow and backward flow, make full use of original flue structure and heat transfer area simultaneously.

Drawings

FIG. 1 is a schematic structural view of an unmodified flue;

FIG. 2 is a schematic structural view of a modified flue;

fig. 3 is a schematic view of a sealing structure.

Wherein, the names corresponding to the reference numbers are:

1-hearth, 2-cyclone main body, 21-first heat insulation lining, 3-flue inlet, 4-flue outlet, 5-return air duct inlet, 6-sealing structure, 61-sealing guard plate, 62-second heat insulation lining, 63-expansion filler and 7-return vertical pipe.

Detailed Description

The present invention will be further described with reference to the following description and examples, which include but are not limited to the following examples.

Example 1

The utility model provides a be applicable to CFB changes gas furnace flue structure, as shown in fig. 2-3, includes the cyclone flue, the cyclone flue includes cyclone main part 2, 2 lateral parts of cyclone main part set up flue entry 3, 2 tops of cyclone main part set up flue export 4, be provided with first thermal-insulated inside lining 21 on 2 inner walls of cyclone main part, 2 bottom returning charge wind channel entrances 5 departments of cyclone main part set up seal structure. When CFB circulation fluidized bed boiler reforms the gas-fired furnace, because no longer take the ash in the flue gas, consequently, do not need cyclone to carry out solid-gas separation, consequently the utility model discloses the cyclone that loses efficiency in the CFB circulation fluidized bed boiler changes into the flue partly, cyclone flue promptly, as shown in fig. 2-3, wherein, cyclone's flue entry 3 unchangeably connects furnace 1, and upper portion flue export 4 unchangeably connects original flue structure, still be provided with first thermal-insulated inside lining 21 on 2 inner walls of cyclone main part and be used for keeping warm, cyclone's cyclone main part 2 unchangeable, cuts off cyclone's returning charge riser 7, and returning charge wind channel entry 5 department at cyclone bottom sets up seal structure, prevents to be detained in it after the flue gas from furnace 1 gets into cyclone in it, perhaps flows back into furnace. Therefore, the utility model discloses a flue gas suitable for CFB changes gas furnace flue structure comes out the back from furnace, gets into through cyclone flue entry 3, goes into original flue structure after whirlwind main part 2 circles round and rises, changes gas furnace flue structure with CFB original flue structure formation CFB, and this CFB changes gas furnace flue structure and utilizes original flue structure and heat transfer area simultaneously. If the cyclone is left untreated, as shown in fig. 1, the flue gas will enter the furnace 1 along with the return riser 7 at the bottom of the cyclone. The utility model discloses a CFB need not demolish the cyclone that loses the function when reforming into the gas furnace, builds new flue again by laying bricks or stones, consequently, should reform transform the mode simple, has saved manpower, material resources.

Example 2

Based on the embodiment 1, the flue outlet 4 of the flue of the cyclone separator is communicated with a vertical shaft. In this embodiment, the flue outlet 4 of the cyclone flue communicates with a vertical shaft, which is an original flue structure of the CFB and is provided with a superheater, an economizer and an air preheater, which are technical means well known to those skilled in the art and will not be described in detail herein.

Example 3

Based on the above embodiment 1 or 2, as shown in fig. 3, the sealing structure includes a sealing guard plate 61 disposed at the inlet of the return air duct, and a second heat insulating lining 62 is applied to the side of the sealing guard plate 61 disposed inside the cyclone main body 2. In this embodiment, a sealing structure is specifically described, the sealing structure is a sealing guard plate 61 sealed at the return air duct inlet 5, the sealing guard plate 61 is sealed at the return air duct inlet 5 in a welding manner, and a second heat insulation lining 62 is laid on the side surface of the sealing guard plate 61 in the cyclone main body 2, so as to prevent heat loss caused by heat dissipation in the cyclone main body 2.

Example 4

Based on the above embodiment 3, the second insulating liner 62 on the enclosing shield 61 and the first insulating liner 21 on the inner wall of the cyclone body 2 are provided with the expansion filler 63 at the gap position. In this embodiment, the second insulating lining 62 on the closed protection plate 61 and the first insulating lining 21 on the inner wall of the cyclone main body 2 are provided with the expanding filler 63 at the gap position, so as to increase the heat preservation effect of the cyclone flue and prevent heat loss caused by heat loss from the second insulating lining 62 on the closed protection plate 61 and the first insulating lining 21 on the inner wall of the cyclone main body 2.

Example 5

Based on the above embodiment 4, the second heat insulation lining 62 is molded by using heat insulation casting material or heat insulation casting material. In this embodiment, the second heat-insulating lining 62 is made of heat-insulating casting material or heat-insulating casting material, and is molded before installation, and is wound with asbestos cord or alumina silicate fiber cotton cord after solidification, and the cotton cord is compressed by 10-15%, and is welded and fixed with the metal part of the return air duct after being filled into the return air duct. The heat insulating casting material or the heat insulating casting material is a material well known to those skilled in the art, and plays a role of heat insulation or heat insulation to prevent heat in the cyclone separation flue from being dissipated to cause heat loss.

Example 6

Based on the above embodiment 4, the expansion filler 63 includes any one of the expansion filler including asbestos cord or alumina silicate fiber cotton cord. In the embodiment, the material selected for the expansion filler is specifically any one of asbestos ropes or alumina silicate fiber cotton ropes.

The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are all covered by the protection scope of the present invention. The invention extends to any novel feature or any novel combination of features disclosed in this specification, and to any novel method or process steps or any novel combination of features disclosed.

Claims

1. The utility model provides a be applicable to CFB changes gas furnace flue structure, its characterized in that, includes the cyclone flue, the cyclone flue includes cyclone main part, cyclone main part lateral part sets up the flue entry, cyclone main part top sets up the flue export, be provided with first thermal-insulated inside lining on the cyclone main part inner wall, cyclone main part bottom feed back wind channel entrance sets up seal structure.

2. The flue structure suitable for the CFB reformed gas furnace according to claim 1, wherein the flue outlet of the cyclone flue is communicated with the shaft.

3. The flue structure suitable for the CFB-modified gas furnace is characterized in that the sealing structure comprises a sealing guard plate arranged at the inlet of the return air duct, and a second heat-insulating lining is laid on the side surface of the sealing guard plate, which is arranged inside the cyclone main body.

4. The flue structure suitable for the CFB reformed gas furnace of claim 3, wherein the thermal liner on the sealing shield and the thermal liner on the inner wall of the cyclone body are provided with expansion filler at the gap position.

5. The flue structure suitable for the CFB reformed gas furnace of claim 4, wherein the second heat insulation lining is cast by using heat insulation casting material or heat insulation casting material.

6. The flue structure for the CFB reformed gas furnace according to claim 4, wherein the expansion filler comprises any one of asbestos cord or alumina silicate fiber cotton cord.