阅读说明：本技术 一种燃煤电站防高温腐蚀喷嘴 (High-temperature corrosion prevention nozzle for coal-fired power plant ) 是由 杨振 戚二兵 孙俊锋 张恩先 管诗骈 岳峻峰 蔡亮 陶谦 黄亚继 张强 肖杰 于 2020-06-19 设计创作，主要内容包括：本发明涉及一种燃煤电站防高温腐蚀喷嘴,包括耐高温不锈钢筒体,所述筒体装配有水冷壁,所述筒体内设有用于吹扫风导流及分布的布气锥,所述的布气锥从筒体的后端开口穿入筒体内；筒体内在布气锥的周围布置有用于导向气流的金属隔板,所述的隔板为四块,将筒体内的吹扫风流道分隔为上、下、左、右四部分；在筒体内的前端安装调节阀,在隔板的分隔作用下,吹扫风进入调节阀后形成上、下、左、右四个独立的风室。本发明通过筒体内的隔板将吹扫空气分布至上、下、左、右四个相互独立的风室中,通过控制阀体挡板角度,强化向下的吹扫风,以达到最佳的防止高温腐蚀效果。(The invention relates to a high-temperature corrosion prevention nozzle of a coal-fired power plant, which comprises a high-temperature-resistant stainless steel cylinder, wherein the cylinder is provided with a water-cooled wall, a gas distribution cone for flow guiding and distribution of blowing air is arranged in the cylinder, and the gas distribution cone penetrates into the cylinder from an opening at the rear end of the cylinder; the periphery of the air distribution cone in the cylinder body is provided with four metal clapboards for guiding air flow, and the sweeping air flow passage in the cylinder body is divided into an upper part, a lower part, a left part and a right part; an adjusting valve is arranged at the front end in the cylinder body, and under the separation action of a partition plate, blowing air enters the adjusting valve to form four independent air chambers, namely an upper air chamber, a lower air chamber, a left air chamber and a right air chamber. The invention distributes the blowing air to the upper, lower, left and right independent air chambers through the partition plate in the cylinder body, and strengthens the downward blowing air by controlling the angle of the valve body baffle plate so as to achieve the best effect of preventing high-temperature corrosion.)

1. A high temperature corrosion nozzle is prevented to coal-fired power plant which characterized in that: the air distribution cone type air distribution device comprises a high-temperature-resistant stainless steel cylinder body, wherein a water-cooled wall is assembled on the cylinder body, an air distribution cone for blowing air flow guiding and distribution is arranged in the cylinder body, and the air distribution cone penetrates into the cylinder body from an opening at the rear end of the cylinder body; the periphery of the air distribution cone in the cylinder body is provided with four metal clapboards for guiding air flow, and the sweeping air flow passage in the cylinder body is divided into an upper part, a lower part, a left part and a right part; an adjusting valve is arranged at the front end in the cylinder body, and under the separation action of a partition plate, blowing air enters the adjusting valve to form an upper air chamber, a lower air chamber, a left air chamber and a right air chamber which are independent; the adjusting valve comprises a valve body shell, a screw and a baffle connected with the lower end of the screw, the screw is mounted on the valve body shell through a bolt, and the sectional area of the air chamber is controlled by adjusting the deflection angle of the baffle.

2. The high temperature corrosion prevention nozzle of a coal-fired power plant as recited in claim 1, wherein: the cross section of barrel be circular, the rear end of governing valve barrel has the opening, the gas distribution awl penetrate the barrel from the rear end opening of barrel in, the front end and the assembly of valve body shell of barrel.

3. The high temperature corrosion prevention nozzle of a coal-fired power plant as recited in claim 2, wherein: the valve body shell consists of an upper wall, a lower wall, a left wall and a right wall, the cross section of the valve body shell is square, and the circular cylinder is tangent to the four sides of the square valve body shell.

4. The high temperature corrosion prevention nozzle of a coal-fired power plant as recited in claim 3, wherein: the baffle be the rectangle, the left and right both sides laminating of rectangle baffle left and right inner wall of square valve body shell.

5. The high temperature corrosion prevention nozzle of a coal-fired power plant as recited in claim 1, wherein: the cross sections of the upper air chamber, the left air chamber and the right air chamber are controlled by controlling the positions of the regulating valves, and the flow of the air chambers is regulated, so that downward blowing air is strengthened, and high-temperature corrosion is prevented.

6. The high temperature corrosion prevention nozzle of a coal-fired power plant as recited in claim 1, wherein: the included angle between any two clapboards can be adjusted according to actual needs.

7. The high temperature corrosion prevention nozzle of a coal-fired power plant as recited in claim 1, wherein: the tail of the baffle plate is cut into an arc shape, so that the baffle plate can be attached to the baffle plate when the sectional area of the air chamber is adjusted.

8. The high temperature corrosion prevention nozzle of a coal-fired power plant as recited in claim 1, wherein: the barrel body is connected with the valve body shell through threads, and the joint of the barrel body and the valve body shell is subjected to corner filling treatment.

Technical Field

The invention relates to the technical field of ash deposition and high-temperature corrosion control of a coal-fired power plant, in particular to a high-temperature corrosion prevention nozzle of the coal-fired power plant

Background

At the present stage, low-nitrogen burners are generally modified in coal-fired units in China, anoxic combustion at the water-cooled wall of a hearth is easily caused, and the high-temperature corrosion process is greatly accelerated by forming strong reducing atmosphere. The water wall pipeline can be thinned continuously due to high-temperature corrosion, and the pipe explosion accident can be caused when the water wall pipeline is thinned to a certain degree, so that the safe operation and the economic benefit of a power plant are seriously influenced. .

The adherence wind can improve the high-temperature corrosion problem, and can be divided into front and rear wall adherence wind and side wall adherence wind according to the difference of adherence wind spraying position into the hearth. The wall-pasting wind of the front wall and the rear wall is characterized in that wind quantity is extracted from secondary wind to be used as boundary wind, and the boundary wind is sprayed out from the front wall and the rear wall of the hearth to the center of the side wall. Because the secondary air pressure is small, the water-cooled wall at the most seriously corroded part in the middle of the side wall can be protected by large air volume (data shows that the air volume accounts for about 5 percent of the total air volume), so that the secondary air pressure with small air pressure becomes smaller, and the combustion of a hearth and the air flow organization are adversely affected. And the adherence wind that the side wall sprays arranges more in a flexible way, can arrange near the corruption region according to the actual conditions of high temperature corrosion, only needs the less amount of wind relatively can effectual isolated water-cooling wall and the inside high temperature flue gas's of furnace contact, can block that buggy air current directly erodees the water-cooling wall, can supply furnace nearly wall department oxygen content again, dilutes reducing atmosphere, prevents the emergence of water-cooling wall high temperature corrosion problem from the source.

Disclosure of Invention

The invention aims to provide a nozzle required by side wall adherence air for solving the problems of ash deposition and high-temperature corrosion of a water-cooled wall of a coal-fired power plant.

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

a high-temperature corrosion prevention nozzle of a coal-fired power plant comprises a high-temperature-resistant stainless steel cylinder body, wherein the cylinder body is provided with a water-cooled wall, a gas distribution cone for flow guiding and distribution of blowing air is arranged in the cylinder body, and the gas distribution cone penetrates into the cylinder body from an opening at the rear end of the cylinder body; the periphery of the air distribution cone in the cylinder body is provided with four metal clapboards for guiding air flow, and the sweeping air flow passage in the cylinder body is divided into an upper part, a lower part, a left part and a right part; an adjusting valve is arranged at the front end in the cylinder body, and under the separation action of a partition plate, blowing air enters the adjusting valve to form an upper air chamber, a lower air chamber, a left air chamber and a right air chamber which are independent; the adjusting valve comprises a valve body shell, a screw and a baffle connected with the lower end of the screw, the screw is mounted on the valve body shell through a bolt, and the sectional area of the air chamber is controlled by adjusting the deflection angle of the baffle.

Furthermore, the cross section of barrel be circular, the rear end of governing valve barrel has the opening, the gas distribution awl penetrate into the barrel from the rear end opening of barrel, the front end and the valve body shell assembly of barrel.

Furthermore, the valve body shell consists of an upper wall, a lower wall, a left wall and a right wall, the cross section of the valve body shell is square, and the round cylinder is tangent to the four sides of the square valve body shell.

Furthermore, the baffle is rectangle, and the left and right both sides laminating of rectangle baffle are left and right inner wall of square valve body shell.

Furthermore, the cross sections of the upper air chamber, the left air chamber and the right air chamber are controlled by controlling the positions of the regulating valves, and the flow of the air chambers is regulated, so that downward blowing air is enhanced, and high-temperature corrosion is prevented.

Furthermore, the included angle between any two partition plates can be adjusted according to actual needs.

Furthermore, the tail part of the clapboard is cut into an arc shape, so that the clapboard can be attached to the baffle plate when the sectional area of the air chamber is adjusted.

Furthermore, the cylinder body is connected with the valve body shell through threads, and the joint of the cylinder body and the valve body shell is subjected to corner filling treatment.

Compared with the prior art, the invention has the beneficial effects that:

the high-temperature corrosion prevention nozzle for the coal-fired power plant provided by the invention has the advantages that the secondary air is used for blowing the water-cooled wall, so that the ash deposition amount and the corrosion rate of the water-cooled wall are reduced. The secondary air blown by the air blower enters the cylinder and is divided into four independent upper, lower, left and right air chambers by a partition plate, the high-speed blowing air is sprayed out by an air distribution cone, the gas flow direction is parallel to a water-cooled wall, the gas flow rate of the outlet of the lower air chamber is weakened if the gas flow of the four air chambers is the same as that of the combustion of the hearth has vertically upward flowing smoke, the gas flow rate of the outlet of the upper air chamber is increased, the blowing interface of the nozzle is irregular, and great challenges are brought to the installation and effect evaluation of the nozzle; in order to better control the blowing air in the pipe, the tail part of the partition plate is cut, the corner filling treatment is carried out between the cylinder body and the valve body, the screw rod is attached to the partition plate when driving the square baffle plate to act, the disturbance of gas is reduced, and meanwhile, in order to meet the requirements of different areas on preventing high-temperature corrosion, the included angle between the partition plates can be adjusted so as to adjust the size of each air chamber.

Drawings

FIG. 1 is a front sectional view of a high temperature corrosion preventing nozzle of a coal-fired power plant according to the present invention.

FIG. 2 is a 45-degree oblique cross-sectional view of the high-temperature corrosion prevention nozzle of the coal-fired power plant of the present invention.

Fig. 3 is a view of the cartridge in cooperation with the valve wall.

FIG. 4 is a schematic diagram of the operation of the shutter.

In the drawings: 1-air distribution cone; 2-a cylinder body; 3-a separator; 4-corner filling; 5-a screw; 6-a baffle plate; 7-adjusting valve.

Detailed Description

The present invention will be described in further detail with reference to specific examples. The following examples are intended to illustrate the invention only and are not intended to limit the scope of the invention.

A high-temperature corrosion prevention nozzle for a coal-fired power plant comprises a high-temperature-resistant stainless steel cylinder 2 as shown in figure 1, wherein the cylinder 2 is provided with a water-cooled wall, an air distribution cone 1 for blowing air flow guiding and distribution is arranged in the cylinder 2, and the air distribution cone 1 penetrates into the cylinder 2 from an opening at the rear end of the cylinder 2.

In order to accurately control the upper and lower blowing air and strengthen the blowing effect, metal clapboards 3 for guiding air flow are arranged around the air distribution cone 1 in the cylinder 2, and the four clapboards 3 divide a blowing air flow passage in the cylinder 2 into an upper part, a lower part, a left part and a right part.

An adjusting valve 7 is arranged at the front end in the cylinder body 2, and under the separation action of the partition plate 3, blowing air enters the adjusting valve 7 to form four independent air chambers, namely an upper air chamber, a lower air chamber, a left air chamber and a right air chamber. The baffle 6 can adjust the deflection angle, control the sectional area of the upper air chamber, the left air chamber and the right air chamber, and is used for accurately reducing the upward blowing wind rigidity and strengthening the downward blowing wind rigidity so as to meet the blowing requirements under different loads. The adjusting valve 7 comprises a valve body shell, a screw rod 5 and a baffle 6 connected with the lower end of the screw rod 5, the screw rod 5 is installed on the valve body shell through a bolt, and the sectional area of the air chamber is controlled by adjusting the deflection angle of the baffle 6.

The cross section of the cylinder body 2 is circular, the rear end of the cylinder body 2 of the regulating valve 7 is provided with an opening, the air distribution cone 1 penetrates into the cylinder body 2 from the opening at the rear end of the cylinder body 2, and the front end of the cylinder body 2 is assembled with the valve body shell.

The valve body shell consists of an upper wall, a lower wall, a left wall and a right wall, the cross section of the valve body shell is square, and the round cylinder body 2 is tangent to the four sides of the square valve body shell.

Baffle 6 be the rectangle, the left and right inner wall of square valve body shell is laminated on the left and right both sides of rectangle baffle 6, rectangle baffle 6 prevents the harm of gas disturbance to the valve body with the laminating of valve body shell.

The cross sections of the upper air chamber, the left air chamber and the right air chamber are controlled by controlling the positions of the regulating valves 7, and the flow of the air chambers is regulated, so that downward blowing air is strengthened, and high-temperature corrosion is prevented.

The included angle between any two partition boards 3 can be adjusted according to actual needs.

The tail part of the clapboard 3 is cut into an arc shape, so that the clapboard can be attached to the baffle 6 when the sectional area of the air chamber is adjusted.

The cylinder body 2 is connected with the valve body shell through threads, and the joint of the cylinder body 2 and the valve body shell is subjected to fillet 4 treatment, so that the resistance is reduced, and the wind noise is reduced.

The four air chambers are independent from each other, and when the blowing air reaches the nozzle position along the air chambers, the blowing air changes the flowing direction under the action of the air distribution cone 1 and is parallel to the water-cooled wall, so that the blowing effect is enhanced.

The invention distributes the blowing air to the upper, lower, left and right independent air chambers through the partition plate in the cylinder body, and strengthens the downward blowing air by controlling the angle of the valve body baffle plate so as to achieve the best effect of preventing high-temperature corrosion.

The air flow sprayed by the upper and lower layer nozzles is combusted, and collides in the middle area of the two layers of nozzles, so that the temperature of the area close to the wall surface is higher, but the influence is gradually weakened along the depth direction of the hearth, so that the influence on the combustion in the furnace is smaller on the whole. The blowing air is parallel to the water wall, the blowing area is enlarged, the blowing air quantity in all directions can be adjusted, the blowing area is rounded, and convenience is brought to nozzle combination installation and effect evaluation.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention in any way, and any person skilled in the art can make any simple modification, equivalent replacement, and improvement on the above embodiment without departing from the technical spirit of the present invention, and still fall within the protection scope of the technical solution of the present invention.