Deslagging and dedusting pipeline of boiler

Abstract

The utility model belongs to the technical field of boiler dedusting and deslagging devices, and relates to a boiler deslagging and dedusting pipeline which comprises a flue, the flue is connected to a deduster through a dedusting pipeline, the deduster is connected with an induced draft pipeline, an induced draft fan is arranged on the induced draft pipeline, the induced draft pipeline is connected to a chimney, and a dust suction pipe is led out of the dedusting pipeline. A dust hood is arranged at the tail end of the dust suction pipe, a slag cooler is arranged on the outer side of the dust hood, a blowback pipe is led out of the dust removal pipeline, and a blowback fan is arranged at the tail end of the blowback pipe. The dust collecting device can effectively collect dust particles in the deslagging period, prevent dust from overflowing and drifting away, improve air quality, reduce abrasion and corrosion of dust to a boiler and accessory equipment of the boiler, prolong the service life of the equipment and reduce maintenance cost.

Description

Technical Field

[0001] This utility model belongs to the technical field of boiler dust removal and slag discharge devices, specifically relating to a boiler slag discharge and dust removal pipeline. Background Technology

[0002] During the operation of coal-fired boilers, heat loss from ash and slag is a significant factor affecting boiler thermal efficiency. Current technologies typically employ ash coolers to cool the high-temperature slag, recovering waste heat from the ash and slag, for example, by transferring the heat to the boiler deaerator, thus achieving energy recycling. However, the dried ash and slag cooled by the ash cooler generates a large amount of dust during transportation due to the fine particles, dry surface, and high fluidity of the ash.

[0003] Dispersed dust can significantly reduce air quality in the work area. High-hardness dust particles, when carried by airflow, rub against the boiler body, pipe valves, and transmission components, leading to increased wear rate on equipment surfaces and shortening component lifespan. Dust deposits on electrical equipment surfaces may cause short circuits, and dust adhering to sensor probes will distort monitoring data, requiring frequent shutdowns for cleaning. Furthermore, dust that is not effectively captured can re-enter the flue system with the airflow, increasing the risk of ash accumulation in the tail flue heat exchanger and reducing waste heat recovery efficiency.

[0004] To address the above problems, a boiler ash discharge and dust removal pipeline is proposed. Utility Model Content

[0005] The purpose of this utility model is to provide a boiler slag discharge and dust removal pipeline with boiler slag discharge and dust removal functions, which solves the problems in the prior art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a boiler ash discharge and dust removal pipeline, including a flue, the flue being connected to a dust collector via a dust removal pipe, the dust collector being connected to an induced draft pipe, an induced draft fan being installed on the induced draft pipe, the induced draft pipe being connected to a chimney, a dust suction pipe being led out from the dust removal pipe, a dust collection hood being installed at the end of the dust suction pipe, a ash cooler being installed outside the dust collection hood, a backflush pipe being led out from the dust removal pipe, and a backflush blower being installed at the end of the backflush pipe.

[0007] Preferably, the suction pipe and the back-blowing pipe are arranged opposite each other.

[0008] Preferably, the suction pipe is equipped with a suction valve, and the backflush pipe is equipped with a backflush valve.

[0009] Preferably, the dust removal duct adopts a double-layer structure, with the inner layer being a 316L stainless steel wear-resistant liner with a thickness of 8-12mm and the outer layer being a Q345 carbon steel protective shell with a thickness of 6-8mm.

[0010] Preferably, the dust collection hood adopts an inverted conical flared structure, and the surface of the dust collection hood is coated with a tungsten carbide wear-resistant coating.

[0011] Preferably, the nozzle outlet of the backflush pipe is provided with a honeycomb-shaped flow equalizer, and the outer wall of the backflush pipe is covered with a nano-aerogel insulation layer.

[0012] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0013] This invention can effectively capture dust particles during slag discharge, prevent dust from overflowing and spreading, improve air quality, reduce dust wear and corrosion on boilers and their auxiliary equipment, extend the service life of equipment, and reduce maintenance costs. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of a boiler ash discharge and dust removal pipeline according to one embodiment;

[0016] In the diagram above, 1 is the flue, 2 is the dust removal pipe, 3 is the dust collector, 4 is the exhaust pipe, 5 is the exhaust fan, 6 is the chimney, 7 is the suction pipe, 8 is the dust collection hood, 9 is the slag cooler, 10 is the suction valve, 11 is the backflush pipe, 12 is the backflush blower, and 13 is the backflush valve. Detailed Implementation

[0017] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0018] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0019] Example 1, as Figure 1 As shown, a boiler ash removal and dust removal pipeline includes a flue 1, which is a channel for boiler flue gas discharge. The flue 1 is connected to a dust collector 3 through a dust removal pipe 2. The dust collector 3 performs efficient filtration and separation of dust-laden gas and captures dust particles. The dust removal pipe 2 connects the flue 1 and the dust collector 3 to transport dust-laden gas, thereby achieving dust collection and cleaning.

[0020] Dust collector 3 is connected to exhaust duct 4, and exhaust fan 5 is installed on exhaust duct 4. Exhaust fan 5 drives the airflow to flow in a directional manner. Exhaust duct 4 is connected to chimney 6. Chimney 6 discharges the dust-treated gas to ensure that the emissions meet environmental protection standards. Dust collection pipe 7 is led out from dust collection duct 2. Dust collection pipe 7 is equipped with dust collection hood 8 at its end. Dust cooler 9 is installed on the outside of dust collection hood 8. Dust cooler 9 cools the high-temperature ash and recovers waste heat. Dust collection hood 8 directly captures dust at the outlet of dust cooler 9 and sends it into dust collection duct 2 through dust collection pipe 7, preventing the ash from escaping due to temperature difference contraction after cooling.

[0021] A backflush pipe 11 extends from the dust collection duct 2, and a backflush blower 12 is installed at the end of the backflush pipe 11. The backflush blower 12 periodically sprays high-pressure airflow into the dust collection duct 2 through the backflush pipe 11 to remove deposited dust.

[0022] The specific design of the aforementioned key components will be discussed in detail below:

[0023] The suction pipe 7 and the backflush pipe 11 are arranged opposite each other. The suction pipe 7 and the backflush pipe 11 are symmetrically led out from the dust removal pipe 2, and the backflush airflow periodically impacts the inlet of the suction pipe 7 to prevent large particles of slag from accumulating and clogging.

[0024] The suction pipe 7 is equipped with a suction valve 10, and the backflush pipe 11 is equipped with a backflush valve 13. The suction valve 10 and the backflush valve 13 control the opening and closing of the suction pipe 7 and the backflush pipe 11 and the flow rate, respectively.

[0025] The dust removal duct 2 adopts a double-layer structure. The inner layer is a 316L stainless steel wear-resistant liner with a thickness of 8-12mm and the surface is shot-blasted to enhance the resistance to abrasive wear. The outer layer is a Q345 carbon steel protective shell with a thickness of 6-8mm and the outer wall is coated with epoxy zinc-rich primer and polyurethane topcoat, achieving a weather resistance of C4 level.

[0026] The dust collection hood 8 adopts an inverted conical flared structure with a cone opening angle of 60±5° to adapt to the outlet width of the slag cooler 9. The surface of the dust collection hood 8 is sprayed with a tungsten carbide wear-resistant coating using the HVOF process, with a coating thickness of 0.8-1.2mm, which improves the wear resistance life.

[0027] The nozzle outlet of the backflush pipe 11 is equipped with a honeycomb flow equalizer, which uses a tungsten cobalt alloy nozzle with an outlet diameter of Φ8-12mm, a throat taper angle of 20° and an expansion angle of 10°. The honeycomb flow equalizer has a pore density of 400-600 mesh and a thickness of 10-15mm. The outer wall of the backflush pipe 11 is covered with a nano-aerogel insulation layer, and a 25-30mm thick aerogel felt is tied and fixed with stainless steel wire mesh to prevent water vapor condensation in the backflush airflow.

[0028] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0029] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A boiler ash removal dust extraction line, characterized in that The chimney is connected to the dust collector through a dust removal pipeline, the dust collector is connected with a induced draft pipeline, an induced draft fan is arranged on the induced draft pipeline, the induced draft pipeline is connected to the chimney, a dust suction pipe is led out from the dust removal pipeline, a dust collecting hood is arranged at the end of the dust suction pipe, a slag cooler is arranged outside the dust collecting hood, a back blowing pipe is led out from the dust removal pipeline, and a back blowing fan is arranged at the end of the back blowing pipe.

2. The boiler ash removal ducting according to claim 1, characterized in that The dust suction pipe and the back blowing pipe are oppositely arranged.

3. The boiler ash removal ducting according to claim 1, characterized in that, A dust suction valve is arranged on the dust suction pipe, and a back blowing valve is arranged on the back blowing pipe.

4. The boiler ash removal ducting according to claim 1, characterized in that The dust removal pipeline has a double-layer structure, the inner layer is a 316L stainless steel wear-resistant lining plate with a thickness of 8-12 mm, and the outer layer is a Q345 carbon steel protective shell with a thickness of 6-8 mm.

5. The boiler ash removal ducting according to claim 1, characterized in that, The dust collecting hood has an inverted conical flared structure, and a tungsten carbide wear-resistant coating is sprayed on the surface of the dust collecting hood.

6. The boiler ash sluicing line according to claim 1, characterized in that A honeycomb flow straightener is arranged at the nozzle outlet of the back blowing pipe, and a nano aerogel thermal insulation layer is wrapped on the outer wall of the back blowing pipe.

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