CN217154207U

CN217154207U - Online cleaning device for accumulated dust in boiler tail flue

Info

Publication number: CN217154207U
Application number: CN202220424379.9U
Authority: CN
Inventors: 房建军; 王怀光; 王凯; 朱兵兵; 李焕松
Original assignee: Xinjiang Markorchem Co ltd
Current assignee: Xinjiang Markorchem Co ltd
Priority date: 2022-03-01
Filing date: 2022-03-01
Publication date: 2022-08-09
Anticipated expiration: 2032-03-01

Abstract

The utility model relates to a thermal power generation technical field is an online cleaning device of boiler afterbody flue deposition, including boiler body, first gyration formula air heater, second gyration air heater, first primary air fan, the fan of second and flue tee bend. The utility model has the advantages of reasonable and compact structure, during the deashing, the soot blowing pressure and the flue gas pressure that blow in the pipeline and the second soot in the first soot blowing pipeline form the disturbance, make in first rotary air heater and the second rotary air heater flue gas side flue and in the boiler afterbody flue sedimentary ash is taken away along with the disturbance of air supply by the flue gas and gets into the electric precipitation, prevent that the flue from blockking up, boiler afterbody flue resistance, the exhaust gas temperature descends obviously, boiler comprehensive efficiency also improves economic benefits thereupon and is showing, the long period running of boiler has been guaranteed, increase the operational benefits, and the safety is saved, and is simple and convenient, the efficient characteristics.

Description

Online cleaning device for accumulated dust in boiler tail flue

Technical Field

The utility model relates to a thermal power technology field is an online cleaning device of boiler afterbody flue deposition.

Background

In recent years, with the rapid development of new energy installation and power generation proportion, the requirement of deep peak regulation of the coal-fired thermal power generating unit is more and more obvious, and a plurality of provinces and cities start the work of deep peak regulation auxiliary service of the coal-fired thermal power generating unit successively. The peak regulation operation of the thermal power generating unit becomes a new normal state of a thermal power enterprise in the future. For a boiler system with deep peak shaving, when the load of a unit is continuously reduced, the flow rate of the boiler flue gas system is also continuously reduced, and the particle size of fly ash particles is basically kept unchanged, so that the fly ash carrying capacity of the flue gas is inevitably in a descending trend under the same flue section, the boiler needs to discharge the flue gas when in operation, the flue gas usually contains impurity particles such as fly ash, and the impurity particles are easy to block at the turning angle of the flue when being conveyed in the flue, so that the blockage of the flue is caused, however, the impurity particles in the flue are inconvenient to clean, and for a pi-shaped boiler, the problem of ash accumulation in the tail flue is very common, and becomes one of limiting conditions influencing the deep peak shaving operation of the unit. The prior art is mainly aimed at a water-cooled wall which is vertically arranged and a heating surface which is horizontally arranged in a coiled pipe, and the ash removal capacity of the bottom of an air preheater is very limited. Most of the deposited ash is manually cleaned during the shutdown maintenance, and the workload involved is very large. In the long-time normal operation process of the rotary air preheater, ash deposition at the bottom of the air preheater can be increased due to continuous change of ash content in burning coal, the ash deposition accumulation can be caused in the long-time operation process, the flow area of a flue gas outlet is influenced, the power consumption of an induced draft fan is increased, and the use of a flue and the normal production of a boiler are influenced.

Disclosure of Invention

The utility model provides an online cleaning device of boiler afterbody flue deposition has overcome above-mentioned prior art not enough, and it can effectively solve the problem that the flow area of the too much smoke outlet of existence of deposition diminishes and draught fan power consumption increases after the long-time operation of current boiler.

The technical scheme of the utility model is realized through following measure: an on-line cleaning device for dust deposition in a tail flue of a boiler comprises a boiler body, a first rotary air preheater and a second rotary air preheater, first primary air machine, second primary air machine and flue tee bend, the afterbody flue outlet of boiler body, the flue gas side import of first gyration formula air heater and the flue gas side import of second gyration formula air heater pass through the fixed intercommunication of flue tee bend and are in the same place, fixed intercommunication has first tuber pipe between the air side import of first gyration formula air heater and the air outlet of first primary air machine, fixed intercommunication has first soot blowing pipeline between first tuber pipe and the first gyration formula air heater flue gas side diapire, fixed intercommunication has the second tuber pipe between the air side import of second gyration formula air heater and the air outlet of second primary air machine, fixed intercommunication has the second soot blowing pipeline on second tuber pipe and the second gyration formula air heater flue gas side diapire.

The following are further optimization or/and improvement of the technical scheme of the utility model:

the first ash blowing pipeline can comprise a first end and a first air pipe fixed communication and a first ash blowing main pipe with a sealed second end, a plurality of first ash blowing branch pipes are arranged between the first rotary air preheater and the first ash blowing main pipe at intervals, the first end of each first ash blowing branch pipe corresponds to the bottom wall of the smoke side of the first rotary air preheater in a fixed position and is communicated with the bottom wall of the smoke side of the first rotary air preheater, the second end of each first ash blowing branch pipe corresponds to the fixed position and is communicated with the first ash blowing main pipe, and each first ash blowing branch pipe is provided with a first valve.

The first ash blowing line may further comprise a second valve disposed on the first ash blowing manifold and adjacent to the first air duct.

The second soot blowing line may be identical in structure to the first soot blowing line.

The first end of the flue tee joint can be fixedly communicated with a tail flue outlet of the boiler body, a first flue is fixedly communicated between the second end of the flue tee joint and a flue gas side inlet of the first rotary air preheater, and a second flue is fixedly communicated between the third end of the flue tee joint and a flue gas side inlet of the second rotary air preheater.

The utility model has the advantages of reasonable and compact structure, during the deashing, the soot blowing pressure and the flue gas pressure that blow in the pipeline and the second soot in the first soot blowing pipeline form the disturbance, make in first rotary air heater and the second rotary air heater flue gas side flue and in the boiler afterbody flue sedimentary ash is taken away along with the disturbance of air supply by the flue gas and gets into the electric precipitation, prevent that the flue from blockking up, boiler afterbody flue resistance, the exhaust gas temperature descends obviously, boiler comprehensive efficiency also improves economic benefits thereupon and is showing, the long period running of boiler has been guaranteed, increase the operational benefits, and the safety is saved, and is simple and convenient, the efficient characteristics.

Drawings

Fig. 1 is a schematic structural view of the preferred embodiment of the present invention.

The codes in the figures are respectively: 1 is the boiler body, 2 is first rotation formula air heater, 3 is second rotation air heater, 4 is first primary air fan, 5 is the second primary air fan, 6 is the flue tee bend, 7 is first tuber pipe, 8 is the second tuber pipe, 9 is first blowing grey house steward, 10 is first blowing grey branch pipe, 11 is first valve, 12 is the second valve, 13 is the second and blows grey house steward, 14 is the second and blows grey branch pipe, 15 is the third valve, 16 is the fourth valve, 17 is first flue, 18 is the second flue.

Detailed Description

The utility model discloses do not receive the restriction of following embodiment, can be according to the utility model discloses a technical scheme and actual conditions determine concrete implementation.

In the present invention, for convenience of description, the description of the relative position relationship of the components is described according to the layout mode of the attached drawing 1 in the specification, such as: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of the drawings of the specification.

The invention will be further described with reference to the following examples and drawings:

as shown in attached figure 1, the on-line cleaning device for the accumulated dust in the tail flue of the boiler comprises a boiler body 1, a first rotary air preheater 2, a second rotary air preheater 3, a first primary fan 4, a second primary fan 5 and a flue tee joint 6, wherein the outlet of the tail flue of the boiler body 1, the flue gas side inlet of the first rotary air preheater 2 and the flue gas side inlet of the second rotary air preheater 3 are fixedly communicated together through the flue tee joint 6, a first air pipe 7 is fixedly communicated between the air side inlet of the first rotary air preheater 2 and the air outlet of the first primary fan 4, a first soot blowing pipeline is fixedly communicated between the first air pipe 7 and the flue gas side bottom wall of the first rotary air preheater 2, a second air pipe 8 is fixedly communicated between the air side inlet of the second rotary air preheater 3 and the air outlet of the second primary fan 5, and a second soot blowing pipeline is fixedly communicated with the bottom wall of the smoke side of the second air pipe 8 and the second rotary air preheater 3.

According to requirements, the boiler body 1 is a known pi-type boiler, a known screen superheater, a high-temperature superheater, a low-temperature superheater and an economizer are sequentially arranged in a flue of the pi-type boiler along the flow direction of flue gas, and the first rotary air preheater 2 and the second rotary air preheater 3 are known rotary air preheaters. During the deashing, the soot blowing pressure and the flue gas pressure that blow in the pipeline and the second soot in the first soot blowing pipeline form the disturbance for sedimentary ash is taken away along with the disturbance of air supply and gets into the electrostatic precipitator by the flue gas in first rotary air heater 2 and the 3 flue gas side flues of second rotary air heater and the boiler afterbody flue, prevents that the flue from blockking up, boiler afterbody flue resistance, exhaust gas temperature decline are obvious, and boiler comprehensive efficiency also improves economic benefits thereupon and is showing, has guaranteed the long period run of boiler, increases the operational benefits, the utility model discloses rational in infrastructure and compact, convenient to use has safety, laborsaving, simple and convenient, efficient characteristics.

The on-line cleaning device for the accumulated dust in the tail flue of the boiler can be further optimized or/and improved according to actual needs:

as shown in the attached drawing 1, the first soot blowing pipeline comprises a first soot blowing main pipe 9 with a first end fixedly communicated with a first air pipe 7 and a sealed second end, a plurality of first soot blowing branch pipes 10 are arranged between a first rotary air preheater 2 and the first soot blowing main pipe 9 at intervals, the first end of each first soot blowing branch pipe 10 is fixedly communicated with the corresponding position of the flue gas side bottom wall of the first rotary air preheater 2, the second end of each first soot blowing branch pipe 10 is fixedly communicated with the corresponding position of the first soot blowing main pipe 9, and each first soot blowing branch pipe 10 is provided with a first valve 11. In the use, through such setting, can adjust the amount of wind in every first ash blowing branch pipe 10 for the deposition on the 2 flue gas side bottom walls of first rotary air preheater is blown up, then is brought into the dust remover by the flue gas and removes dust, prevents that the flue from blockking up, can also improve dust collection efficiency.

As shown in fig. 1, the first sootblowing line further comprises a second valve 12 provided on the first sootblowing main 9 and adjacent to the first ductwork 7. In the use process, the second valve 12 is arranged between the first ash blowing branch pipe 10 close to the first air pipe 7 and the first air pipe 7, through the arrangement, the maintenance of the first valve 11 and the adjustment of the air volume in the first ash blowing branch pipe 10 and the air volume in the first air pipe 7 can be facilitated, and the primary air blower output can be freely adjusted according to the actual requirement on the ash blowing pressure.

As shown in fig. 1, the second sootblowing line is identical in structure to the first sootblowing line. The second soot blowing pipeline comprises a second soot blowing main pipe 13 with a first end fixedly communicated with the second air pipe 8 and a second end sealed, at least one second soot blowing branch pipe 14 is fixedly communicated with the bottom wall of the smoke side of the second rotary air preheater 3 at intervals, the other end of each second soot blowing branch pipe 14 is fixedly communicated with the second soot blowing main pipe 13, a third valve 15 is arranged on each second soot blowing branch pipe 14, a fourth valve 16 is arranged at one end, close to the second air pipe 8, of the second soot blowing main pipe 13, subsequent maintenance is facilitated, the pressure of an air source in the second soot blowing pipeline is the same as that of an air source in the first soot blowing pipeline and is between 6.5 and 9.0kpa, and therefore the effect on the normal operation of the boiler can be avoided while the soot removing efficiency is improved.

As shown in the attached drawing 1, a first end of the flue tee 6 is fixedly communicated with a tail flue outlet of the boiler body 1, a first flue 17 is fixedly communicated between a second end of the flue tee 6 and a flue gas side inlet of the first rotary air preheater 2, and a second flue 18 is fixedly communicated between a third end of the flue tee 6 and a flue gas side inlet of the second rotary air preheater 3. According to requirements, a pin removal system which is well known in the prior art is arranged in each of the first flue 17 and the second flue 18. In the use, through setting up first flue 17 and second flue 18, can improve the recycle usefulness of boiler afterbody flue gas energy, still be convenient for simultaneously with boiler body 1 afterbody flue export be connected with first rotary air preheater 2, second rotary air preheater 3, the dismouting of being convenient for.

Above technical feature constitutes the utility model discloses a best embodiment, it has stronger adaptability and best implementation effect, can increase and decrease unnecessary technical feature according to actual need, satisfies the demand of different situation.

Claims

1. An on-line cleaning device for dust deposition in a boiler tail flue is characterized by comprising a boiler body, a first rotary air preheater and a second rotary air preheater, first primary air fan, second primary air fan and flue tee bend, the afterbody flue export of boiler body, the flue gas side import of first gyration formula air heater and the flue gas side import of second gyration air heater pass through the fixed intercommunication of flue tee bend and be in the same place, fixed intercommunication has first tuber pipe between the air side import of first gyration formula air heater and the air outlet of first primary air fan, it has first soot blowing pipeline to fix the intercommunication between first tuber pipe and first gyration formula air heater flue gas side diapire, it has the second tuber pipe to fix the intercommunication between the air side import of second gyration air heater and the air outlet of second primary air fan, it has the second soot blowing pipeline to fix the intercommunication on second tuber pipe and the second gyration air heater flue gas side diapire.

2. The boiler tail flue dust deposition online cleaning device according to claim 1, wherein the first dust blowing pipeline comprises a first dust blowing main pipe, the first end of the first dust blowing main pipe is fixedly communicated with the first air pipe, the second end of the first dust blowing main pipe is sealed, a plurality of first dust blowing branch pipes are arranged between the first rotary air preheater and the first dust blowing main pipe at intervals, the first end of each first dust blowing branch pipe is fixedly communicated with the bottom wall of the flue gas side of the first rotary air preheater at a corresponding position, the second end of each first dust blowing branch pipe is fixedly communicated with the first dust blowing main pipe at a corresponding position, and each first dust blowing branch pipe is provided with a first valve.

3. The on-line cleaning device for the accumulated dust in the back flue of the boiler as claimed in claim 2, wherein the first soot-blowing pipeline further comprises a second valve disposed on the first soot-blowing header pipe and adjacent to the first air pipe.

4. The boiler tail flue dust deposition online cleaning device as claimed in claim 2 or 3, characterized in that the second soot blowing pipeline has the same structure as the first soot blowing pipeline.

5. The boiler tail flue dust deposition online cleaning device according to claim 1, 2 or 3, characterized in that a first end of a flue tee joint is fixedly communicated with a tail flue outlet of a boiler body, a first flue is fixedly communicated between a second end of the flue tee joint and a flue gas side inlet of a first rotary air preheater, and a second flue is fixedly communicated between a third end of the flue tee joint and a flue gas side inlet of a second rotary air preheater.

6. The boiler tail flue dust deposition online cleaning device according to claim 4, wherein a first end of the flue tee is fixedly communicated with a tail flue outlet of the boiler body, a first flue is fixedly communicated between a second end of the flue tee and a flue gas side inlet of the first rotary air preheater, and a second flue is fixedly communicated between a third end of the flue tee and a flue gas side inlet of the second rotary air preheater.