CN217685102U - Boiler capable of preventing cold ash bucket from being corroded - Google Patents

Abstract

The utility model discloses a boiler capable of preventing a cold ash bucket from being corroded, a plurality of burners are symmetrically arranged on the bottom floor of a front wall water-cooled wall and a rear wall water-cooled wall of a boiler furnace chamber, an air preheater is arranged on a flue at the tail part of the boiler, and the air preheater is communicated with each burner through an air box to provide air for each burner; and a plurality of air holes are respectively arranged on the front wall surface and the rear wall surface of the ash cooling bucket at the bottom end of the boiler, each air hole is connected with a distribution air box, and the distribution air boxes are communicated with the air boxes. The utility model discloses the boiler is through arranging the wind hole bottom the cold ash bucket, and the flue gas backward flow that a certain amount of wind that utilizes the wind hole to blow in appears in order to destroy cold ash bucket water-cooling wall top reaches the effect of preventing, controlling the high temperature corrosion. In addition, in the source of wind, the utility model discloses use hot primary air or hot overgrate air, can not lead to exhaust gas temperature to rise.

Description

Boiler capable of preventing cold ash bucket from being corroded

Technical Field

The utility model belongs to the pulverized coal boiler field especially relates to a can prevent boiler of cold ash bucket corruption.

Background

Under the background that the economy changes from a high-speed growth stage to a high-quality development stage, the coal-fired power plant adopts a low NOx combustion technology, and the boiler adopts the deep air classification low-nitrogen combustion technology to control the generation of NOx in the boiler, so that the serious problem of high-temperature corrosion of a water-cooled wall is brought, and then the risks of serious production safety hazards such as pipe wall reduction and even pipe explosion are generated.

The research on the high-temperature corrosion of the water-cooled wall is more, and the prevention and control technologies are more, but the research on the corrosion of the cold ash bucket is less, and the prevention and control technologies are less. Research shows that an important factor causing the high-temperature corrosion of the cold ash bucket is that the flue gas of the bottom-layer combustor flows back to continuously wash the surface of the cold ash bucket, and the higher the content of hydrogen sulfide and carbon monoxide in the returned flue gas is, the more serious the corrosion is.

At present, the main route for preventing the high-temperature corrosion of the cold ash bucket is to spray a protective layer: the protective layer of millimeter level is smeared on the surface of the water cooled wall of the cold ash bucket which is easy to be washed, so that the cold ash bucket can be effectively prevented from high-temperature corrosion.

SUMMERY OF THE UTILITY MODEL

In the boiler, burners are symmetrically arranged on the front wall and the rear wall, and torches on the front wall and the rear wall are oppositely combusted and collide with each other at the center of a hearth. Most of flue gas flows upwards after the torch inside the hearth collides at the center, and a negative pressure area is formed below high-speed flue gas due to the high flow rate of the flue gas sprayed by the front wall burner and the rear wall burner, so that a small part of high-temperature flue gas at the center flows back to the flame root of the burners downwards along the cold ash hopper. Just because bad backward flow has appeared above the cold ash fill for the high temperature flue gas constantly erodes cold ash fill water-cooled wall, has accelerated the high temperature corrosion of cold ash fill.

The utility model aims to provide an: in order to overcome the problems of the prior art, the boiler capable of preventing the corrosion of the cold ash bucket is disclosed, air is introduced into the bottom of the cold ash bucket, the smoke backflow at the bottom of the cold ash bucket is weakened, even the backflow is not formed, and the risk of high-temperature corrosion is effectively reduced.

The purpose of the utility model is realized through the following technical scheme:

a boiler capable of preventing a cold ash bucket from being corroded is characterized in that a plurality of burners are symmetrically arranged on the bottom floor of a front wall water-cooled wall and a rear wall water-cooled wall of a boiler hearth, an air preheater is arranged on a flue at the tail of the boiler, and the air preheater is communicated with each burner through an air box and provides air for each burner; and a plurality of air holes are respectively arranged on the front wall surface and the rear wall surface of the ash cooling bucket at the bottom end of the boiler, each air hole is connected with a distribution air box, and the distribution air boxes are communicated with the air boxes.

According to a preferred embodiment, both ends of the distribution bellows communicate with the bellows via respective air ducts.

According to a preferred embodiment, a damper is provided on the air duct.

According to a preferred embodiment, the air holes are arranged below the burner and above the same row as the burner.

According to a preferred embodiment, the air hole is located in the middle of the ash hopper.

According to a preferred embodiment, the number of air holes is 1-5 times the number of burners.

According to a preferred embodiment, the air holes are formed by water wall water supply pipe elbows; and the shape of the wind hole is round or rectangular.

According to a preferred embodiment, the distribution windboxes introduce an air volume from the windboxes which is less than 3% of the total air volume in the windboxes.

According to a preferred embodiment, the air inlet end of the air preheater is connected with a blower.

Aforementioned the utility model discloses main scheme and each further alternative can the independent assortment in order to form a plurality of schemes, are the utility model discloses can adopt and claim the scheme of protection. The technical solutions to be protected by the present invention, which are various combinations that can be known to those skilled in the art based on the prior art and the common general knowledge after understanding the present invention, are not exhaustive herein.

The utility model has the advantages that: the utility model discloses the boiler is through arranging the wind hole bottom the cold ash bucket, and the flue gas backward flow that a certain amount of wind that utilizes the wind hole to blow in appears in order to destroy cold ash bucket water-cooling wall top reaches the effect of preventing, controlling the high temperature corrosion. In addition, in the source of wind, the utility model discloses use hot primary air or hot overgrate air, can not lead to exhaust gas temperature to rise.

Drawings

FIG. 1 is a schematic structural view of a boiler according to the present invention;

FIG. 2 is a schematic view of the arrangement structure of the burners and the air holes on the furnace chamber of the boiler;

FIG. 3 is a schematic diagram of the arrangement position of the air holes on the boiler of the present invention;

FIG. 4 is a schematic view of the structure of the upper air hole of the boiler of the present invention;

FIG. 5 is a schematic view of turbulent air and back-flow flue gas of the burner of the present invention;

the method comprises the following steps of 1-front wall water cooling wall, 2-burner, 3-rear wall water cooling wall, 4-blower, 5-air preheater, 6-air box, 7-damper, 8-air duct, 9-ash cooling bucket, 10-distribution air box, 11-water pipe and 12-air hole.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1:

referring to fig. 1, there is shown a boiler capable of preventing corrosion of a soot hopper. The boiler comprises a hearth, a burner 2, an air preheater 5, a blower 4 and the like. The bottom layers of the front wall water-cooled wall 1 and the back wall water-cooled wall 3 of the boiler furnace are symmetrically provided with a plurality of burners 2.

An air preheater 5 is arranged in a flue at the tail part of the boiler, and the air preheater 5 is communicated with each combustor 2 through an air box 6 to provide air for each combustor 2. And the air inlet end of the air preheater 5 is connected with an air blower 4.

And a plurality of air holes 12 are respectively arranged on the front wall surface and the rear wall surface of the ash cooling bucket 9 at the bottom end of the boiler, each air hole 12 is connected with a distribution air box 10, and the distribution air box 10 is communicated with the air box 6.

Preferably, both ends of the distribution air box 10 are respectively communicated with the air box 6 through the air ducts 8. The distribution bellows 10 is supplied with air via the bellows 6. Further, in the present embodiment, one distribution wind box 10 is provided on each of the front and rear wall surfaces of the ash hopper 9. The air duct 8 is provided with an air damper 7. Namely, the air ducts 8 on the two sides of the ash cooling hopper 9 are independently controlled, so that the air quantity and the air speed can be flexibly adjusted according to the actual combustion condition of the boiler.

Preferably, the air holes 12 are arranged below the burner 2 and above the same row as the burner 2.

Preferably, the air hole 12 is located in the middle of the ash hopper 9. I.e., the 1/2L region in FIG. 3.

Preferably, the number of the wind holes 12 is 1 to 5 times the number of the burners 2.

Preferably, the air holes 12 are formed by bending the water supply pipe 11 of the water wall; and the shape of the wind holes 12 is circular or rectangular.

Preferably, the air volume introduced from the windbox 6 by the distribution windbox 106 accounts for 3% or less of the total air volume in the windbox 6.

The utility model discloses the boiler is located to arrange wind hole 12 at cold ash bucket 1/2L, as shown in fig. 5, blows in certain amount of wind and then plays the effect of destroying the backward flow in to cold ash bucket 8 through wind hole 12, except playing the effect of eliminating the backward flow, CO takes place to react in the air of spouting and the flue gas, weakens reducing atmosphere and has restrained hydrogen sulfide and generate, even can not eliminate the backward flow completely, because the backward flow flue gas composition changes, also can weaken the corruption. Moreover, the air sprayed from the air holes 12 comes from the hot primary air or the hot secondary air at the outlet of the air preheater 5, so that the air-smoke ratio of the air preheater 5 is not influenced, and the exhaust smoke temperature is not increased.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (9)

1. A boiler capable of preventing a cold ash bucket from being corroded is characterized in that a plurality of burners (2) are symmetrically arranged on the bottom floor of a front wall water-cooled wall (1) and a rear wall water-cooled wall (3) of a boiler hearth,

the boiler tail flue is provided with an air preheater (5), and the air preheater (5) is communicated with each combustor (2) through an air box (6) to provide air for each combustor (2);

and a plurality of air holes (12) are respectively arranged on the front wall surface and the rear wall surface of the ash cooling bucket (9) at the bottom end of the boiler, each air hole (12) is connected with a distribution air box (10), and the distribution air box (10) is communicated with the air box (6).

2. A boiler according to claim 1, characterized in that both ends of the distribution box (10) are in communication with the wind box (6) via respective wind channels (8).

3. A boiler according to claim 2, characterized in that the air duct (8) is provided with a damper (7).

4. A boiler according to claim 1, characterized in that said air holes (12) are arranged below the burner (2) and above the same row of burners (2).

5. A boiler according to claim 4, characterized in that said air holes (12) are located in the middle of said ash hopper (9).

6. A boiler according to claim 1, characterized in that the number of said air holes (12) is 1-5 times the number of burners (2).

7. A boiler according to claim 1, characterized in that the air ports (12) are formed by bends of the waterwall header (11); and the shape of the air holes (12) is round or rectangular.

8. A boiler according to claim 1, characterized in that the air volume of the distribution windbox (10) introduced from the windbox (6) amounts to less than 3% of the total air volume in the windbox (6).

9. The boiler according to claim 1, characterized in that the air inlet end of the air preheater (5) is connected with a blower (4).

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