CN210320005U

CN210320005U - Boiler wall-attached air system for preventing high-temperature corrosion of water wall

Info

Publication number: CN210320005U
Application number: CN201920922668.XU
Authority: CN
Inventors: 张秀昌; 朱凯旋
Original assignee: Dongfang Boiler Group Co Ltd
Current assignee: Dongfang Boiler Group Co Ltd
Priority date: 2019-06-19
Filing date: 2019-06-19
Publication date: 2020-04-14
Anticipated expiration: 2029-06-19

Abstract

The utility model discloses a prevent water-cooled wall high temperature corrosion's boiler adherence wind system, the boiler includes furnace, cold ash bucket and furnace's front wall, back wall, left side wall and right side wall, be equipped with adherence wind trompil on the cold ash bucket left and right sides bucket wall of left side wall and right side wall below, inside adherence tuber pipe one end stretched into furnace through adherence wind trompil, adherence tuber pipe was inside the furnace be the decurrent crookedness of spout. The utility model discloses directly arrange the adherence wind on being located the cold ash bucket of left and right both sides wall below, the adherence tuber pipe is vertical down at the inside crooked spout of furnace, the air is through the adherence tuber pipe get into furnace after in furnace negative pressure effect turn over down upwards, flow along the water-cooling wall, flow velocity is the same with furnace interior flue gas, the even effectual oxygen content that supplyes the side wall region under the condition of not destroying interior flue gas flow field, improve side wall reducing atmosphere to alleviate the high temperature corrosion of side wall water-cooling wall.

Description

Boiler wall-attached air system for preventing high-temperature corrosion of water wall

Technical Field

The utility model belongs to the technical field of power plant boiler equipment technique and specifically relates to a boiler adherence wind system of waterproof cold wall high temperature corrosion.

Background

In recent years, with the continuous improvement of environmental requirements, countries require lower NOx emission, and therefore most boilers adopt a low-nitrogen combustion technology, front-wall and rear-wall opposed combustion boilers become one of combustion equipment mainly adopted by domestic supercritical and ultra-supercritical boilers due to the advantages of combustion equipment and heating surface arrangement, and are widely applied to domestic on-service thermal power generating units. In order to realize efficient, economic and environment-friendly operation, the type of the furnace generally adopts an air staged combustion mode to control NO_xAnd (5) discharging. The air staged combustion is to send air required by fuel combustion into a hearth in stages, and the air staged combustion boiler generally comprises a main combustion zone, a reduction zone and a burnout zone. 70-90% of the air quantity required by fuel combustion is fed into the main combustion area, an oxygen-poor environment is created, and the remaining air required by the complete combustion of the fuel is fed into the burnout area at a certain distance from the upper part of the top layer combustor through the burnout air nozzle, so that the unburnt fuel is completely combusted in the area under the oxygen-rich condition. When the sulfur content in the coal is higher, a large amount of H is generated in the near-wall region of the water-cooled wall in the reducing atmosphere₂S and CO and other gases having corrosion action on the water wall, when the sulfur content of the fuel is higher, Sar is more than or equal to 1.0 percent, and O is close to the water wall₂≤2％，CO＞0.5％，H₂When S is more than 0.01 percent, the high-temperature corrosion of the water-cooled wall is easy to occur, so that the water-cooled wall has serious sulfide type high-temperature corrosion, and the middle water-cooled wall area of the side wall is more seriously corroded in the hedging furnace.

At present, the common technical means for solving the problem is to add wall-attaching wind in the area of the front wall and the rear wall close to the side wall or on the side wall; the wall-attached air is additionally arranged in the area, close to the side wall, of the front wall and the rear wall, the air is difficult to blow to the center of the side wall of the hearth, the corrosion of the water-cooled wall in the middle of the side wall hardly plays a role, the wall-attached air is additionally arranged on the side wall, the flow field in the middle of the hearth can be damaged, the wall-attached air nozzle is easy to coke and block, and the nozzle is easy to burn. The utility model discloses a chinese utility model patent that publication number is CN207179641U discloses a boiler of side wall adherence wind, stretch into furnace and make adherence wind spout position vertical upwards from the boiler side wall with adherence wind tuber pipe, this method though enables adherence wind and upwards flows along the furnace lateral wall face, alleviates water-cooling wall high temperature corrosion, nevertheless because the boiler burning is complicated changeable, the coke breeze of whereabouts more easily plugs up vertical ascending adherence wind gap in the stove to the high temperature flue gas in the stove burns out the wind gap easily, influences anticorrosive effect.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems that in the prior art, wall-attached air is arranged in the side wall area of a front-back wall opposed firing boiler to prevent the high-temperature corrosion of the water-cooled wall, but the reducing atmosphere in the middle water-cooled wall area of the side wall is changed slightly, so that the corrosion-reducing effect is not obvious; when the adherent air port is upwards arranged on the side wall, the air port is easy to burn out and the air port is easy to block, thereby providing the adherent air system of the boiler for preventing the high-temperature corrosion of the water-cooled wall.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a prevent water-cooling wall high temperature corrosion's boiler adherence wind system, the boiler includes furnace, cold ash bucket and furnace's front wall, back wall, left side wall and right side wall, be equipped with the combustor on front wall and the back wall, be equipped with adherence wind trompil on the cold ash bucket left and right sides headwall of left side wall and right side wall below, adherence tuber pipe one end stretches into inside the furnace through adherence wind trompil, and adherence tuber pipe is the decurrent crookedness of spout inside furnace.

Furthermore, the adherence wind trompil is symmetrical on cold ash bucket left side headwall and right headwall and is set up one row or multirow in every side cold ash bucket headwall horizontal direction, and every row sets up 2-8 trompils.

Furthermore, when the wall-adhering air openings are arranged in multiple rows, the wall-adhering air openings of two adjacent rows are arranged in a staggered mode.

Furthermore, the adherence air pipe bent downwards at the nozzle in the hearth can lead the air entering the hearth to be bent upwards under the action of negative pressure in the hearth to form a W shape.

Furthermore, the other end of the wall-attached air pipe is connected with the middle upper part of the secondary air box so as to prevent dust deposited on the secondary air box from being mixed into wall-attached air to influence the effect or flush the water-cooled wall.

Furthermore, the number and the size of the wall-attached air openings are designed to be 2-5% of the total air quantity in the hearth through the wall-attached air openings, the air speed is 5-40m/s, and the middle flow field of the hearth cannot be damaged to influence the boiler efficiency.

Furthermore, the vertical height of the adherence air open pore is between the middle part of the ash cooling bucket and the top part of the ash cooling bucket, the adherence air open pore is arranged at the middle upper part of the left bucket wall and the right bucket wall of the ash cooling bucket, and the lower temperature of the ash cooling bucket can prevent the nozzle of the adherence air pipe from burning out or coking.

Furthermore, the nozzle of the adherence air pipe in the hearth is vertically downward, so that the adherence air is enabled to turn upward under the action of negative pressure in the hearth, the reducing atmosphere of the side wall is improved along the flow of the water-cooled wall, and the nozzle can be prevented from being blocked by falling slag in the furnace downwards.

The utility model has the advantages that: the utility model discloses directly arrange the adherence wind on the cold ash bucket that is located left and right both sides wall below, the adherence tuber pipe is vertical down at the inside crooked spout of furnace, the air is turned over upwards under the negative pressure effect in the furnace after entering furnace through the adherence tuber pipe, flow along the water-cooling wall, the flow velocity is the same with flue gas in the furnace, even effectual supplementary side wall regional oxygen volume under the condition of not destroying interior flue gas flow field of stove, improve side wall reducing atmosphere to alleviate the high temperature corrosion of side wall water-cooling wall, make the operation that the boiler can be more safe and stable economy;

the arrangement mode that the nozzles face downwards can prevent the nozzles from being blocked by falling slag in the furnace, and the smoke temperature of the area of the cold ash bucket is about 700 ℃ and 800 ℃, so that the nozzles of the adherence air pipes can be prevented from burning out or coking.

Drawings

Fig. 1 is a schematic structural view of an adherent air duct arrangement according to an embodiment of the present invention;

fig. 2 is a side view of an adherent air duct of an embodiment of the invention;

FIG. 3 is a wall-attached wind opening and wall-attached wind direction diagram of the ash cooling bucket according to the embodiment of the present invention;

labeled as: 1-rear wall, 2-hearth, 3-right side wall, 4-wall-attached air pipe, 5-ash cooling bucket, 6-front wall, 7-burner, 8-left side wall and 9-ash cooling bucket wall.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

As shown in fig. 1, fig. 2, fig. 3, the utility model discloses a prevent water-cooling wall high temperature corrosion's boiler adherence wind system, the boiler includes furnace 2, cold ash bucket 5 and furnace's front wall 6, back wall 1, left side wall 8 and right side wall 3, be equipped with combustor 7 on front wall 6 and the back wall 1, be equipped with adherence wind trompil on the cold ash bucket 5 left and right sides below left side wall 8 and right side wall 3 on the headwall, the vertical height of adherence wind trompil is located between 5 tops of cold ash bucket 5 middle parts to cold ash bucket. Inside adherence tuber pipe 4 one end stretches into furnace 2 through adherence wind trompil, upper portion is connected in 4 other ends of adherence tuber pipe and the secondary bellows, adherence tuber pipe 4 is the vertical decurrent crookedness of spout inside furnace 2, adherence tuber pipe 4 that the spout is crookedly down inside furnace 2 enable the air that gets into in furnace 2 turn over upwards under furnace 2 interior negative pressure, form W shape. Wall-adhering air holes are symmetrically formed in the left hopper wall and the right hopper wall of the cold ash hopper 5, one row or multiple rows of wall-adhering air holes are formed in the horizontal direction of the hopper wall of the cold ash hopper 5 on each side, each row of wall-adhering air holes is formed in 2-8 holes, and when the multiple rows of wall-adhering air holes are formed, the wall-adhering air holes in two adjacent rows are arranged in a staggered mode. The number and the size of the wall-attached air openings are designed to be 2-5% of the total air quantity in the hearth 2.

Example (b):

as shown in fig. 1, fig. 2, fig. 3, a prevent water-cooled wall high temperature corrosion's boiler adherence wind system, the boiler includes furnace 2, cold ash bucket 5 and furnace's front wall 6, back wall 1, left side wall 8 and right side wall 3, be equipped with combustor 7 on front wall 6 and the back wall 1, adherence wind trompil is located on the cold ash bucket 5 of left side wall 8 and right side wall 3 below, and adherence wind trompil symmetry sets up on the wall of fighting about cold ash bucket 5 promptly, the vertical height of adherence wind trompil is located between 5 middle parts of cold ash bucket to 5 tops of cold ash bucket. Inside adherence tuber pipe 4 one end stretches into furnace 2 through adherence wind trompil, upper portion is connected in adherence tuber pipe 4 other end and the secondary bellows, adherence tuber pipe 4 is the vertical decurrent crook of spout inside furnace 2, adherence tuber pipe 4 at the inside spout crook of furnace 2 enable the air that gets into in furnace 2 turn over under furnace 2 internal negative pressure effect upwards, form W shape, turn over under furnace internal negative pressure effect upwards after the air blowout, flow velocity is the same with the interior flue gas of stove along the water-cooling wall, does not destroy the interior flue gas flow field of stove. Wall-adhering air holes are symmetrically formed in the left hopper wall and the right hopper wall of the cold ash hopper 5, two rows of wall-adhering air holes are formed in the horizontal direction of the hopper wall of the cold ash hopper 5 on each side, 3 holes are formed in each row, and the two rows of wall-adhering air holes are arranged in a staggered mode. The number and the size of the wall-attached air openings are designed in such a way that the air quantity entering the hearth 2 through the wall-attached air openings accounts for 2-5% of the total air quantity in the hearth 2, and the air speed is 5-40 m/s.

Claims

1. The utility model provides a prevent water-cooled wall high temperature corrosion's boiler adherence wind system, the boiler includes preceding wall, back wall, left side wall and the right side wall of furnace, cold ash bucket and furnace, be equipped with combustor, its characterized in that on preceding wall and the back wall: be equipped with adherence wind trompil on the bucket wall about the cold ash bucket of left side wall and right side wall below, inside adherence tuber pipe one end stretched into furnace through adherence wind trompil, adherence tuber pipe is the decurrent crookedness of spout inside furnace.

2. The adherent wind system of boiler of preventing water-cooled wall high temperature corrosion of claim 1, characterized by: the wall-attached air holes are symmetrically formed in the left hopper wall and the right hopper wall of the cold ash hopper, one row or multiple rows of wall-attached air holes are formed in the horizontal direction of the hopper wall of the cold ash hopper on each side, and 2-8 holes are formed in each row.

3. The adherent wind system of boiler of preventing water-cooled wall high temperature corrosion of claim 2, characterized by: when the adherent wind trompil multirow sets up, the adherent wind trompil staggered arrangement of adjacent two rows.

4. The adherent wind system of boiler of preventing water-cooled wall high temperature corrosion of claim 1, characterized by: the adherence wind pipe bending downwards at the spout inside the hearth can lead the air entering the hearth to be bent upwards under the action of negative pressure in the hearth to form a W shape.

5. The adherent wind system of boiler of preventing water-cooled wall high temperature corrosion of claim 1, characterized by: the other end of the wall-attached air pipe is connected with the middle upper part of the secondary air box.

6. The adherent boiler air system for preventing high-temperature corrosion of the water wall of claim 1 or 5, wherein: the number and the size of the wall-attached air openings are designed to be 2-5% of the total air quantity in the hearth.

7. The adherent wind system of boiler of preventing water-cooled wall high temperature corrosion of claim 1, characterized by: the vertical height of the adherence air opening hole is positioned between the middle part of the cold ash bucket and the top of the cold ash bucket.

8. The adherent wind system of boiler of preventing water-cooled wall high temperature corrosion of claim 1, characterized by: the wall-attached air pipe is vertically downward at a nozzle in the hearth.