CN213983641U

CN213983641U - Waste incineration exhaust-heat boiler flue capable of reducing dust deposition and coking on tail heating surface

Info

Publication number: CN213983641U
Application number: CN202022449009.4U
Authority: CN
Inventors: 崔静; 李文杰; 邓倩; 程稚; 王翔; 高灵锋; 周立刚; 叶洲海; 张澈; 黄旭
Original assignee: MHPS Dongfang Boiler Co Ltd
Current assignee: MHPS Dongfang Boiler Co Ltd
Priority date: 2020-10-29
Filing date: 2020-10-29
Publication date: 2021-08-17
Anticipated expiration: 2030-10-29

Abstract

The utility model relates to a reduce msw incineration exhaust-heat boiler flue of afterbody heating surface deposition coking. The utility model discloses a set up perpendicularly and first flue, second flue, the third flue that communicates in proper order, connect in the afterbody flue that third flue rear side and level set up, be provided with the afterbody heated surface in the afterbody flue, still including setting up the gas-solid separation ware at third flue exhanst gas outlet, the third flue passes through gas-solid separation ware and afterbody flue intercommunication. The utility model discloses a carry out the gas-solid separation to the high temperature flue gas in order to get rid of the grits in the flue gas to the problem of afterbody heating surface deposition in the afterbody flue, coking has been solved. Compared with the prior art, the utility model, the life of afterbody heating surface is prolonged greatly, and exerting oneself of boiler obtains effectively promoting, and the deashing number of times of afterbody flue and the blowing out frequency of boiler obviously reduce, and the operating cycle of boiler can reach about 1 year in the actual application, has alleviateed the running cost of unit greatly.

Description

Waste incineration exhaust-heat boiler flue capable of reducing dust deposition and coking on tail heating surface

Technical Field

The utility model relates to a msw incineration exhaust-heat boiler especially relates to a reduce msw incineration exhaust-heat boiler flue of afterbody heating surface deposition coking, belongs to power plant boiler equipment technical field.

Background

The high-temperature flue gas of the waste incineration waste heat boiler contains a large amount of ash particles, which are easily attached to a heating surface in a flue to cause ash deposition and coking, and the ash deposition and coking on the heating surface can seriously restrict the operation period of the boiler. Even under the condition that a soot blower is arranged in the tail flue, the waste heat boiler runs for about 30 days, and a remarkable soot deposition phenomenon can still be observed on the tail heating surface. The phenomena of dust deposition and coking on the heating surface at the tail part can bring about a plurality of problems: firstly, the heat transfer resistance is increased by the accumulated ash on the heating surface at the tail part, so that the output of the boiler is reduced, the exhaust gas temperature of the boiler is overhigh, the running economy of the boiler is reduced, and the boiler has to be shut down for maintenance when the accumulated ash is serious, so that the long-period running of the boiler is difficult to realize; the ash deposition and coking of the tail heating surface can also cause the heating surface to be over-heated, and the ash particles and the pipe wall can generate complex chemical reaction to form high-temperature corrosion, thereby shortening the service life of the heating surface.

In order to solve the problems of dust deposition and coking on the heating surface of the tail flue, the current adopted solution is as follows: arranging soot blowers such as steam soot blowers, shock wave soot blowers or rapping soot blowers and the like in a tail flue, wherein the soot blowing frequency is more than two times per shift, a high smoke temperature area such as a high temperature evaporator, a high temperature superheater area or even five times per shift is blown, and the operation cycle of the boiler is about 50 days generally under the soot blowing frequency; if manual online ash removal is added, the operation period of the boiler can be prolonged to about 70 days. However, the above solution does not fundamentally solve the problems of dust deposition and coking in the tail flue, so that the boiler inevitably needs to be started and stopped frequently, which brings adverse effects to the economy of the operation of the whole power plant.

Disclosure of Invention

The utility model discloses solve the afterbody heating surface deposition that prior art exists, coking and seriously cause boiler operation cycle short, the relatively poor technical defect of economic nature, provide a afterbody heating surface and produce deposition less, coking therefore boiler operation cycle long, the better waste incineration exhaust-heat boiler flue of reduction afterbody heating surface deposition coking of economic nature.

The utility model discloses to above-mentioned technical problem mainly can solve through following technical scheme: the utility model discloses a set up perpendicularly and first flue, second flue, the third flue that communicates in proper order, connect in the afterbody flue that third flue rear side and level set up, be provided with the afterbody heated surface in the afterbody flue, its characterized in that still includes the gas solid separation ware, and the third flue is linked together through gas solid separation ware and afterbody flue.

Preferably, the gas-solid separator is provided with an air inlet, an air outlet and an ash residue outlet, the third flue gas outlet is connected with the air inlet, the tail flue gas inlet is connected with the air outlet, and the ash residue outlet is connected with an ash residue conveying system of the unit.

Preferably, the third flue gas outlet is in sealing connection with the air inlet through the first interface, and the tail flue gas inlet is in sealing connection with the air outlet through the second interface.

Preferably, the gas-solid separator is a cyclone separator.

Therefore, the utility model discloses rational in infrastructure has following advantage:

the utility model discloses in, install gas-solid separator in the flue, utilize gas-solid separator to carry out gas-solid separation to high temperature flue gas, high temperature flue gas gets into afterbody flue after getting rid of grits, impurity through gas-solid separator. Because the gas-solid separation is carried out on the high-temperature flue gas in the gas-solid separator, the concentration of ash particles in the flue gas is obviously reduced, so that the phenomena of ash deposition and coking on the heated surface of the tail part in the tail flue are obviously improved in the operation process of the unit, the phenomena of bridging, over-temperature corrosion and the like generated on the heated surface of the tail part are avoided, and the service life of the heated surface of the tail part and the operation period of a boiler are greatly prolonged.

The gas-solid separator is arranged at the flue gas outlet of the third flue with relatively low flue gas temperature, which is beneficial to reducing the working temperature of the gas-solid separator, thereby improving the working efficiency and the service life of the gas-solid separator; meanwhile, an ash residue outlet of the gas-solid separator is connected with an ash residue conveying system of the unit, so that ash particles separated from the flue gas can be timely conveyed to an ash unloading site through the ash residue conveying system.

Therefore, the utility model discloses the deposition of tail portion heating surface, coking problem in the afterbody flue have been solved effectively. Compared with the prior art, the utility model, the life of afterbody heating surface is prolonged greatly, and exerting oneself of boiler obtains effectively promoting, and the deashing number of times of afterbody flue and the blowing out frequency of boiler obviously reduce, and the operating cycle of boiler can reach about 1 year in the actual application, has alleviateed the running cost of unit greatly.

Drawings

FIG. 1 is a block diagram of the flue gas flow of the present invention;

fig. 2 is a schematic view of an embodiment of the present invention.

Description of reference numerals: 1. a first flue; 2. a second flue; 3. third flue 31, first interface; 4. a tail flue; 41. a second interface; 5. a gas-solid separator; 51. an air inlet; 52. an air outlet; 53. an ash outlet; 6. a tail heating surface.

Detailed Description

The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.

Example 1: as shown in attached drawings 1 and 2, the utility model comprises a first flue 1, a second flue 2 and a third flue 3 which are vertically arranged and are sequentially communicated, a tail flue 4 communicated with the third flue 3, and a gas-solid separator 5 fixedly arranged between the third flue 3 and the tail flue 4, wherein the gas-solid separator 5 adopts a cyclone separator;

the tail flue 4 is horizontally arranged, and a tail heating surface 6 is arranged in the tail flue 4;

the gas-solid separator 5 is provided with an air inlet 51, an air outlet 52 and an ash residue outlet 53, the smoke outlet of the third flue 3 is hermetically connected with the air inlet 51 through a first connector 31, the smoke inlet of the tail flue 4 is hermetically connected with the air outlet 52 through a second connector 41, and the ash residue outlet 53 is connected with an ash residue conveying system of the unit.

When the unit operates, high-temperature flue gas from a hearth sequentially passes through a first flue 1, a second flue 2 and a third flue 3, gas-solid separation is carried out on the high-temperature flue gas from the hearth at a flue gas outlet of the third flue 3 through a gas-solid separator 5, the high-temperature flue gas with the separated ash particles enters a tail flue 4, the ash particle concentration in the high-temperature flue gas is greatly reduced, and the high-temperature flue gas flows through a tail heating surface 6 and is finally discharged from a flue gas outlet of the tail flue 4;

the ash particles separated from the high-temperature flue gas are sent to an ash conveying system of the unit through an ash outlet 53.

Of course, the drawings and examples described above are only for the purpose of illustrating and explaining the present invention and should not be taken as unduly limiting the invention. All the technical solutions obtained by making equivalent adjustments and changes according to the present invention fall within the protection scope of the present invention.

Claims

1. The utility model provides a reduce msw incineration exhaust-heat boiler flue of afterbody heating surface deposition coking, includes perpendicular setting and first flue (1), second flue (2), third flue (3) that communicate in proper order, connect in afterbody flue (4) of third flue (3) rear side and level setting, be provided with afterbody heating surface (6) in afterbody flue (4), its characterized in that still includes gas solid separator (5), third flue (3) pass through gas solid separator (5) with afterbody flue (4) are linked together.

2. The waste incineration waste heat boiler flue for reducing the tail heating surface ash coking according to the claim 1, characterized in that the gas-solid separator (5) is provided with an air inlet (51), an air outlet (52) and an ash outlet (53), the flue gas outlet of the third flue (3) is connected with the air inlet (51), the flue gas inlet of the tail flue (4) is connected with the air outlet (52), and the ash outlet (53) is connected with an ash conveying system of the unit.

3. The waste incineration waste heat boiler flue for reducing soot deposition and coking on the tail heating surface as recited in claim 2, wherein the flue gas outlet of the third flue (3) is hermetically connected with the air inlet (51) through a first interface (31), and the flue gas inlet of the tail flue (4) is hermetically connected with the air outlet (52) through a second interface (41).

4. The waste incineration waste heat boiler flue for reducing the dust deposition and coking on the tail heating surface as claimed in claim 1, 2 or 3, characterized in that the gas-solid separator (5) adopts a cyclone separator.