CN218781311U

CN218781311U - Hot-blast stifled device that sweeps of rotation air preheater

Info

Publication number: CN218781311U
Application number: CN202220673004.6U
Authority: CN
Inventors: 杨明伟; 王龙杰; 王中莹; 宋晓辰; 王入欣; 武辉
Original assignee: Hebei Handan Power Generation Co Ltd
Current assignee: Hebei Handan Power Generation Co Ltd
Priority date: 2022-03-25
Filing date: 2022-03-25
Publication date: 2023-03-31
Anticipated expiration: 2032-03-25

Abstract

The utility model discloses a hot air purging anti-blocking device of a rotary air preheater, wherein an isolation purging anti-blocking sub-bin is arranged in the rotary air preheater, the cold and hot ends of the isolation purging anti-blocking sub-bin are connected with a pipeline for natural circulation of pressure difference at the two ends, and an air door adjusting device is arranged on the pipeline and is used for sealing and isolating a sector plate, a primary fan-shaped plate, a smoke sector plate and a smoke arc plate from other sub-bins; the utility model provides an among the technical scheme, need not to shut down the stove and can keep apart to air heater and sweep and prevent stifled, can reach the purpose that the hot-blast forced circulation in extraction hot junction reaches the metal of cold junction heating cold junction, just so can promote the metal wall temperature of cold junction rapidly, make liquid ammonium bisulfate become the gaseous state, eliminate the jam problem, reach the thermal isolation and sweep and prevent stifled purpose.

Description

Hot-blast stifled device that sweeps of rotation air preheater

Technical Field

The utility model relates to a boiler product technical field specifically is a rotation air preheater sweeps and prevents stifled device with hot-blast.

Background

Along with the improvement of environmental protection requirements, power station boilers of thermal power plants are mostly additionally provided with denitration devices. In order to improve the denitration efficiency, an excessive ammonia spraying mode is adopted, escaped ammonia gas can generate chemical reaction with sulfuric acid in flue gas to form ammonium bisulfate, the ammonium bisulfate is in a liquid state within the range of 146-207 ℃, and the liquid ammonium bisulfate can be bonded with fly ash to form a blockage to be attached to a heat exchange element of the rotary air preheater, so that the rotary air preheater is blocked. In addition, the SCR denitration device can cause the increase of the ammonia escape rate along with the aging of the denitration catalyst, and can also cause the blockage of air preheater equipment at the tail part of a boiler, thereby bringing influence to the safe and economic operation of a power plant. At present, there are two main treatment techniques adopted in the industry, one is to increase the temperature of the cold end metal wall by adding a warm air device or a hot air recirculation device and improve the condensation phenomenon to eliminate the deposited dust. The principle of the treatment technology is that the generation of liquid ammonium bisulfate is reversible, and the ammonium bisulfate can be converted between liquid state, solid state and gaseous state along with the change of temperature, so that the dewing phenomenon of the ammonium bisulfate can disappear by increasing the temperature of the metal wall of the heat exchange element, the ammonium bisulfate attached to the element is changed into gaseous state from liquid state, the gaseous ammonium bisulfate has no influence on the air preheater and can directly flow away along with flue gas, the liquid ammonium bisulfate is not available, the fly ash can not be bonded, the blocking phenomenon disappears, and the aim of thermal isolation blowing and blocking prevention is fulfilled. The other method is to remove the deposited dust by additionally installing a double-medium soot blower system and utilizing a steam soot blowing matched with an off-line or on-line high-pressure water device. The first method can cause the efficiency of the boiler to be reduced, heat loss exists, and the improvement amplitude is lower; the second method has higher requirements on the operation level and has poorer effects of isolating, sweeping and blocking prevention.

The first treatment technique mentioned in the first treatment technique is to extract a part of hot air from the outlet of the preheater and mix it with cold air to raise the inlet air temperature, increase the average wall temperature at the cold end, protect the heat transfer elements at the cold end of the preheater and reduce corrosion and ash blockage. There are two arrangements for hot air recirculation. A first arrangement is to draw a portion of the hot air directly into the inlet of the blower. The arrangement has the advantages of simple structure, only one adjusting baffle except for the connecting air duct, and lower cost; the hot air from the air preheater carries ash, and after the hot air and the cold air are mixed and enter the air blower, the ash is often accumulated on the blades of the air blower, so that the efficiency of the air blower is reduced, and the blades are periodically isolated and swept to prevent blockage (the blades are not easy to be isolated and swept to prevent blockage). Because part of the hot air is recycled in the preheater, the air side resistance is increased, the efficiency of the fan is reduced, and the power consumption of the fan is increased. The second arrangement mode is that a recirculation fan is adopted to send hot air to an outlet of a blower to be mixed with cold air, and then the mixture enters the preheater. The advantage of this arrangement is that the individual recirculation fans can balance the pressure loss across the preheater, but the overall power consumption is low, although it also increases, avoiding blower blade fouling, and is easy to control (often with a mixing chamber).

Generally, the hot air recycling system is adopted to slightly lower the temperature of the hot air at the outlet of the preheater and slightly raise the temperature of the exhaust smoke, which has an influence on the efficiency of the boiler. In addition, the air side resistance of the preheater is increased, and the service power is also increased. Because the extraction amount is large, the influence on the boiler efficiency is large, the improvement range of the cold end wall temperature is small, the effect is poor because the heating area is too large, the temperature can only be increased by 15-20 ℃ at most, and the aim of preventing blockage cannot be achieved.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to prior art's weak point, provide a rotation air preheater hot-blast stifled device that sweeps to solve the problem that provides in the background art.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides a rotation air preheater sweeps and prevents stifled device, is provided with in rotation air preheater to keep apart and sweeps and prevent stifled branch storehouse, keep apart to sweep and prevent stifled branch storehouse cold and hot both ends and be connected with the pipeline that is used for the pressure differential natural circulation at both ends, laid air door adjusting device on the pipeline to and be used for accomplishing to keep apart to sweep and prevent stifled branch storehouse and other branch storehouse seal isolations have sector plate, primary fan shaped plate, flue gas sector plate and flue gas arc.

Optionally, keep apart to sweep and prevent stifled branch storehouse setting and be close to the region between the flue gas side in the cold overgrate air side of air preheater, keep apart to sweep prevent stifled branch storehouse with other divide the storehouse to seal and keep apart.

Optionally, the components for sealing and isolating comprise isolating sector plates of the rotary air preheater, which are radially arranged above and below the rotor, arc plates axially arranged outside the rotor, a supporting device and sealing plates.

Optionally, the duct is also provided with associated door closers, dampers and metal compensators.

Optionally, the sector plate, the primary fan-shaped plate and the flue gas sector plate are all radially mounted above and below a rotor of the rotary air preheater.

Optionally, the arc-shaped plate fixing device is installed at the side position of the isolation purging anti-blocking sub-bin.

Optionally, a truss reinforcing device is installed on one side of the flue gas sector plate, and the truss reinforcing device is located on one side of the arc plate fixing device.

Optionally, a flue gas inlet, a flue gas outlet, an air inlet and an air outlet are formed at two ends of the isolation blowing anti-blocking sub-bin.

Compared with the prior art, the utility model provides a rotation air preheater sweeps and prevents stifled device with hot air, possesses following beneficial effect:

the utility model discloses a flue gas sector plate, the flue gas arc, arc fixing device keeps apart out an solitary isolation and sweeps and prevent stifled branch storehouse, through the pipeline, will keep apart to sweep and prevent stifled cold and hot both ends in branch storehouse and connect, arrange baffle and expansion joint in the pipeline, equipment such as air door adjusting device, realized keeping apart under the condition that does not have the effect to boiler efficiency sweeping stifled on line to air heater, need not to shut down the stove and can keep apart to sweep to air heater and prevent stifled, can reach the purpose of the hot-blast forced circulation to the metal of cold junction heating cold junction in extraction hot junction, just so can promote the metal wall temperature of cold junction rapidly, make liquid ammonium bisulfate become the gaseous state, eliminate and block up the problem, reach the thermal isolation and sweep and prevent stifled purpose.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a front view of the present invention;

fig. 2 is a top view of the present invention;

FIG. 3 is a schematic view of a partial structure of the present invention;

fig. 4 is the utility model discloses keep apart and sweep the structure sketch map of preventing stifled branch storehouse.

In the figure: 1. a pipeline; 2. a damper adjusting device; 302. a flue gas inlet; 303. a flue gas outlet; 304. an air inlet; 305. an air outlet; 4. a sector plate; 6. isolating, blowing, blocking-proof and sub-warehouse; 7. a primary fan-shaped plate; 8. a flue gas sector plate; 9. a flue gas arc plate; 10. an arc plate fixing device; 11. truss reinforcement device.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, 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 orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be further noted that, unless otherwise specified or limited, the terms "disposed," "installed," "connected" and "connected" should be understood broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, or connected through an intermediate medium, and can communicate between the inside of two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

Referring to fig. 1-4, in this embodiment: the utility model provides a hot-blast stifled device that prevents that sweeps of rotation air preheater is provided with in rotation air preheater and keeps apart to sweep and prevents stifled branch storehouse 6, keeps apart to sweep and prevents stifled branch storehouse 6 cold and hot both ends and be connected with the pipeline 1 that is used for the pressure difference natural circulation at both ends, has laid air door adjusting device 2 on the pipeline 1 to and be used for accomplishing to keep apart to sweep and prevent stifled branch storehouse 6 and other branch storehouses seal isolation have sector plate 4, primary fan shaped plate 7, flue gas sector plate 8 and flue gas arc 9.

The isolated blowing anti-blocking sub-bin 6 is arranged in a region between the cold secondary air side of the air preheater and the side close to the flue gas side, and the isolated blowing anti-blocking sub-bin 6 is hermetically isolated from other sub-bins; the anti-blocking sub-bin 6 for achieving isolation sweeping and sealing isolation from other sub-bins is provided with a sector plate 4, a primary fan-shaped plate 7, a smoke sector plate 8, a smoke arc plate 9, an arc plate, a supporting device and a sealing sheet which are axially arranged on the outer side of the rotor; the related door closing, damper and metal compensator are also arranged in the pipeline 1; the sector plate 4, the primary fan-shaped plate 7 and the flue gas sector plate 8 are radially arranged above and below a rotor of the rotary air preheater; an arc-shaped plate fixing device 10 is arranged at the side edge position of the isolation blowing anti-blocking sub-bin 6; a truss reinforcing device 11 is arranged on one side of the flue gas fan-shaped plate 8, and the truss reinforcing device 11 is positioned on one side of the arc-shaped plate fixing device 10; two ends of the isolated blowing anti-blocking sub-bin 6 are provided with a flue gas inlet 302, a flue gas outlet 303, an air inlet 304 and an air outlet 305.

The isolation purging anti-blocking sub-bin 6 in the embodiment is arranged between a smoke side sub-bin and a wind side sub-bin, specifically, between a smoke side and a secondary wind side of an air preheater, and the isolation purging anti-blocking sub-bin 6 is hermetically isolated from other sub-bins. This embodiment is through flue gas sector plate 8, flue gas arc 9, arc fixing device 10 keeps apart a solitary isolation and sweeps and prevent stifled branch storehouse 6, through pipeline 1, will keep apart to sweep and prevent stifled cold and hot both ends in branch storehouse 6 and link up, arrange baffle and expansion joint in pipeline 1, equipment such as air door adjusting device 2, realize the closed circulation of hot-blast in this region, so can reach the purpose of the hot-blast forced circulation that extracts the hot junction to the metal of cold junction heating cold junction, just so can promote the metal wall temperature of cold junction rapidly, make liquid ammonium bisulfate become the gaseous state, eliminate and block up the problem, reach the thermal isolation and sweep and prevent stifled purpose.

Through each parameter of accurate calculation, can realize keeping apart under the condition that does not influence boiler efficiency better and sweep the effect of preventing blocking up. The heat isolation purging anti-blocking sub-bin 6 is subjected to heat isolation purging anti-blocking, the temperature of a cold end metal wall in the region can be rapidly increased, the blocking condition can be rapidly eliminated at 100-150 ℃, and each region of the heating surface can be shifted to the isolation purging anti-blocking sub-bin 6 due to the cyclic rotation of the preheater, so that the cyclic isolation purging anti-blocking is realized, and the blocking of the whole heating surface can be eliminated. Because the isolated blowing anti-blocking range is small, the required hot air quantity is low, and the hot air is in closed circulation, so that the boiler efficiency is not influenced. Because the thermal insulation sweeps and prevents stifled system and also need not blowing out and also can use, can avoid the loss that the blowing out caused, in addition owing to can use on line, the thermal insulation sweeps and prevents stifled system and can open regularly or irregularly as required, can be in the user state even always, can reduce like this for a long time not clear up and the plug that forms.

The above only is the preferred embodiment of the present invention, not so limiting the patent scope of the present invention, all under the concept of the present invention, the equivalent structure transformation made by the contents of the specification and the drawings is utilized, or the direct/indirect application is included in other related technical fields in the patent protection scope of the present invention.

Claims

1. The utility model provides a rotation air preheater hot-blast stifled device that sweeps which characterized in that: be provided with in rotary air heater and keep apart and sweep stifled minute storehouse (6), keep apart to sweep and prevent stifled minute storehouse (6) cold and hot both ends are connected with pipeline (1) that is used for the pressure differential natural circulation at both ends, laid air door adjusting device (2) on pipeline (1) to and be used for accomplishing to keep apart to sweep stifled minute storehouse (6) and divide the storehouse to seal and keep apart there are sector plate (4), once fan-shaped plate (7), flue gas sector plate (8) and flue gas arc (9).

2. The rotary type air preheater hot air blowing anti-blocking device as claimed in claim 1, wherein: keep apart to sweep and prevent stifled branch storehouse (6) setting is close to the region between the flue gas side in the cold overgrate air side of air preheater, keep apart to sweep and prevent stifled branch storehouse (6) and divide the storehouse to seal and keep apart.

3. The rotary air preheater hot air blowing anti-blocking device as claimed in claim 1, wherein: the pipeline (1) is also provided with a closing door, a damper and a metal compensator.

4. The rotary type air preheater hot air blowing anti-blocking device as claimed in claim 1, wherein: the sector plate (4), the primary fan-shaped plate (7) and the smoke sector plate (8) are all radially arranged above and below a rotor of the rotary air preheater.

5. The rotary air preheater hot air blowing anti-blocking device as claimed in claim 1, wherein: an arc-shaped plate fixing device (10) is installed at the side edge position of the isolation purging anti-blocking sub-bin (6).

6. The rotary air preheater hot air blowing anti-blocking device as claimed in claim 1, wherein: a truss reinforcing device (11) is installed on one side of the smoke fan-shaped plate (8), and the truss reinforcing device (11) is located on one side of the arc-shaped plate fixing device (10).

7. The rotary air preheater hot air blowing anti-blocking device as claimed in claim 1, wherein: a flue gas inlet (302), a flue gas outlet (303), an air inlet (304) and an air outlet (305) are formed in two ends of the isolation purging anti-blocking sub-bin (6).