Flue gas duct one-way support for pulverized coal fired boiler flue gas treatment system

Abstract

The utility model discloses a smoke and air duct one-way support for a pulverized coal boiler smoke treatment system, and relates to an air duct support. Comprising a bottom plate, sliding plates, sliding pieces, a top plate, guide plates, vertical plates and arc-shaped pipe supports. The bottom plate is fixedly connected to the upper surface of the pipeline support. The sliding plate is connected to the upper surface of the bottom plate. The upper portion of the vertical plate is of a cambered surface structure, and the cambered surface of the upper portion of the vertical plate is fixedly connected with the arc-shaped pipe support. The arc-shaped pipe bracket is supported at the bottom of the horizontal flue; the bottom of the vertical plate is fixedly connected to the upper surface of the top plate; the sliding piece is fixedly connected to the middle of the lower surface of the top plate, guide plates are fixedly connected to the two sides of the lower surface of the top plate respectively, and the sliding piece is aligned to the sliding plate so that the top plate and the sliding plate can slide relatively. Two sides of the bottom plate are in sliding contact with the inner sides of the guide plates on two sides; according to the one-way support, displacement of the pipeline in the axial direction can be met, damage to the pipeline support caused by stress generated by thermal expansion is avoided, and the use effect is better.

Description

Technical Field

[0001] The utility model relates to an air duct support, in particular to a smoke and air duct one-way support for a smoke treatment system of a pulverized coal boiler. Background Art

[0002] The pulverized coal industrial boiler is a highly efficient and environmentally friendly coal-fired equipment suitable for various industrial production fields. It is a new type of coal-fired industrial boiler with "pulverized coal combustion technology" as its core. The pulverized coal is centrally ground by the pulverizing plant. The raw coal is ground to 200 mesh fineness after removing impurities. The pulverized coal has fine particle size, is easy to ignite, has a high volatile value, and has uniform particles. It is suspended and burned in the air. Compared with layered combustion, the combustion air ratio is low, the pulverized coal burnout rate is ≥98%, and the boiler thermal efficiency is ≥88%. The pulverized coal has low ash content and high fuel utilization rate. The boiler can be started and stopped immediately, which not only reduces the operating cost, but also emits less waste and reduces the load of the flue gas treatment system.

[0003] The current treatment process for high-temperature flue gas generated by pulverized coal industrial boilers is: SCR denitrification + bag filter dust removal + wet desulfurization + wet electrostatic precipitator. First, the high-temperature flue gas (350-400°C) in the middle of the boiler enters the SCR denitrification device, and ammonia is evenly sprayed into the flue gas by the ammonia spray grid. After being fully mixed by the static mixer, it enters the catalytic reactor. Under the action of the catalyst, ammonia and NOx undergo an oxidation-reduction reaction, reducing NOx to harmless N2 and H2O, thereby achieving NO XAfter the high-temperature flue gas passes through the economizer and air preheater for two-stage heat exchange (about 130℃), it enters the bag filter to remove dust. The dusty gas enters the ash hopper through the guide pipe from the air intake smoke box, and then slowly rises to the filter chamber. Due to the sudden expansion of the cross-sectional area of ​​the air flow and the decrease in the flow rate, some dust particles with larger particle sizes settle into the ash hopper under the action of gravity. When the dust with smaller particle size passes through the outer surface of the filter bag, it is trapped on the outer surface to form an ash cake layer under the combined effects of inertial collision, screening, electrostatic attraction and hooking effect. The purified clean gas enters the clean air chamber through the inside of the filter bag and is discharged from the exhaust smoke box; the gas with dust removed enters the desulfurization tower after passing through the induced draft fan, and passes through the atomization spray area in the middle. The SO2 molecules in the flue gas collide, adsorb, dissolve and absorb with the lime slurry atomized into tiny droplets (0.01-1mm), completing the flue gas desulfurization. After the lime slurry fully reacts with the flue gas, air is introduced into the lower part of the tower to force oxidation of the intermediate desulfurization products, which are then transported to the dehydration equipment by the extraction pump for dehydration, and the filtered clear liquid is returned to the desulfurization tower for reuse. The flue gas after the reaction rises and passes through the demisting device at the top to capture the large-size droplets in the flue gas to avoid the flue gas carrying a large amount of water and causing corrosion to the flue and chimney; after the flue gas leaves the desulfurization tower, it enters the wet electrostatic precipitator through the lower air inlet, and rises to the dust collecting tube bundle after being evenly distributed through the flow equalizing plate. The high-voltage corona discharge of the anode wire charges the dust, and the charged dust reaches the dust collecting tube wall under the action of the electric field force, removing ultrafine dust (PM2.5), acid mist, water droplets and other harmful substances. The dust collecting tube bundle is flushed regularly so that the collected dust is removed with the flow of flushing liquid.

[0004] Steel smoke and air ducts are usually used between the above-mentioned process equipment to connect boilers, bag filter dust collectors, induced draft fans, desulfurization towers and wet electrostatic precipitators, so that the flue gas can be processed through each device in turn to achieve standard emissions. Smoke and air ducts are divided into two forms: horizontal pipes and vertical pipes, and their cross-sections are generally circular. The main function of the horizontal pipe support is to support the pipeline to prevent it from being affected by gravity, pressure and other external factors. It can withstand the weight of the pipeline and the forces caused by internal pressure and external load temperature changes, and transfer these loads to the concrete pipe support to ensure the normal operation and service life of the pipeline. According to the shape of the cross-section of the pipe support, it is divided into curved groove type, T-bracket type and arc plate type. The original design used an arc-shaped plate support, which consisted of an arc-shaped pipe support, a vertical plate, a bottom plate, and reinforcing ribs. The vertical plate was welded to the bottom plate, and the arc-shaped pipe support was welded on the arc surface of the upper part of the vertical plate. The steel pipe was placed on the arc-shaped pipe support, and the bottom plate and the pipe support were connected as a whole through embedded bolts to bear the vertical load of the pipe and allow the pipe to slide and displace horizontally in the arc-shaped pipe support. Some problems occurred during the long-term use of the system, mainly including:

[0005] 1. Difficult to adjust: During the use of the arc plate support, once a problem occurs and adjustment is required, due to the complexity of its structure, the adjustment is difficult, the adjustment accuracy is not high, and deviations are prone to occur.

[0006] 2. Susceptible to environmental influences: Arc plate bearings are easily affected by environmental factors, such as temperature changes, corrosion, etc., which may lead to bearing aging and failure.

[0007] 3. There are safety hazards: If the arc plate support is not installed in a standardized manner or maintained improperly, it may cause the pipeline support to be unstable, posing a safety hazard. Utility Model Content

[0008] The utility model overcomes the shortcomings of the prior art and provides a one-way smoke and air duct support for a pulverized coal boiler smoke treatment system, so as to solve the problem that the arc plate support of the horizontal smoke and air duct in the pulverized coal boiler smoke treatment system is difficult to adjust during long-term use.

[0009] In order to achieve the above purpose, the utility model is implemented through the following technical solutions.

[0010] A one-way support for a smoke and air duct used in a smoke treatment system of a pulverized coal boiler comprises a bottom plate, a slide plate, a sliding piece, a top plate, a guide plate, a vertical plate and an arc-shaped pipe support; the bottom plate is fixedly connected to the upper surface of a pipe support; the slide plate is connected to the upper surface of the bottom plate; the upper portion of the vertical plate is an arc-shaped structure, and the arc-shaped pipe support is fixedly connected to the upper arc-shaped surface of the vertical plate; the arc-shaped pipe support is supported at the bottom of a horizontal smoke and air duct; the bottom of the vertical plate is fixedly connected to the upper surface of the top plate; the sliding piece is fixedly connected to the middle portion of the lower surface of the top plate, and guide plates are fixedly connected to both sides of the lower surface of the top plate, and the sliding piece is placed on the slide plate in an aligned manner so that the top plate and the slide plate can slide relative to each other; the two sides of the bottom plate are in sliding contact with the inner sides of the guide plates on both sides.

[0011] Furthermore, the sliding sheet is a stainless steel plate, and the sliding plate is a polytetrafluoroethylene plate.

[0012] Furthermore, the slide plate is bonded to the upper surface of the bottom plate by epoxy resin glue, and the sliding sheet is welded to the middle part of the lower surface of the top plate.

[0013] Furthermore, the arc-shaped pipe support is welded on the arc surface of the vertical plate.

[0014] Furthermore, guide plates are welded on both sides of the lower surface of the top plate.

[0015] The beneficial effects of the utility model compared with the prior art are:

[0016] The one-way support of the utility model can meet the displacement of the pipeline in the axial direction, avoid the stress caused by thermal expansion from causing damage to the pipeline support, and has a better use effect.

[0017] The sliding piece and the sliding plate of the utility model are respectively made of stainless steel and polytetrafluoroethylene, which ensures the flexible movement of the pipeline, effectively reduces friction and wear, and prolongs the service life of the support.

[0018] The one-way support of the utility model has a simple structure and is easy to install and maintain, thus saving a lot of time and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view of the one-way support of the smoke and air duct described in the utility model.

[0020] In the figure:

[0021] 1- bottom plate; 2- slide plate; 3- sliding plate; 4- top plate; 5- arc-shaped pipe support; 6- guide plate; 7- vertical plate; 8- horizontal smoke and air duct. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail in combination with the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The technical solution of the present invention is described in detail below in combination with the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0023] like Figure 1 As shown, this embodiment provides a one-way support for a smoke duct for a pulverized coal boiler smoke treatment system; the one-way support is arranged at the lower part of a horizontal smoke duct 8, and comprises: a bottom plate 1, a slide plate 2, a sliding plate 3, a top plate 4, a guide plate 6, a vertical plate 7, an arc-shaped pipe support 5, etc. The vertical plate 7 is welded to the upper surface of the top plate 4, the upper part of the vertical plate 7 is an arc surface structure, and the arc-shaped pipe support 5 is welded on the arc surface of the upper part of the vertical plate 7; the arc-shaped pipe support 5 is supported at the bottom of the horizontal smoke duct 8.

[0024] The sliding piece 3 is welded to the middle of the lower surface of the top plate 4, the guide plates 6 are welded to the two sides of the lower surface of the top plate 4, and the bottom plate 1 is welded to the upper surface of the pipe bracket; the sliding plate 2 is glued to the upper surface of the bottom plate 1 with epoxy resin glue; the sliding piece 3 is placed after being aligned with the sliding plate 2 to ensure that the top plate 4 can move freely on the sliding plate 2 without jamming; the two sides of the bottom plate 1 are in sliding contact with the inner sides of the guide plates 6 on both sides.

[0025] The steel horizontal smoke and air duct 8 is placed on the arc-shaped pipe support 5 and welded together; after installation, the one-way support can not only withstand the vertical load of the horizontal smoke and air duct 8, but also through the limitation of the guide plate 6, the sliding plate 3 can only move freely on the slide plate 2 along the axial direction of the horizontal smoke and air duct 8, eliminating the influence of thermal expansion on the pipeline.

[0026] The one-way support of the utility model can meet the displacement of the pipeline in the axial direction, avoid the stress caused by thermal expansion to damage the pipeline support, and have a better use effect. The sliding sheet 3 and the sliding plate 2 are made of stainless steel and polytetrafluoroethylene respectively, ensuring the flexible movement of the pipeline, effectively reducing friction and wear, and extending the service life of the support. The one-way support of the utility model has a simple structure, is easy to install and maintain, and can save a lot of time and cost.

[0027] The above content is a further detailed description of the utility model in combination with a specific preferred implementation method. It cannot be determined that the specific implementation methods of the utility model are limited to this. For ordinary technicians in the technical field to which the utility model belongs, they can make several simple deductions or substitutions without departing from the utility model, which should be regarded as belonging to the utility model and the scope of patent protection determined by the submitted claims.

Claims

1. A one-way support for a smoke duct of a pulverized coal boiler smoke treatment system, characterized in that: The utility model comprises a bottom plate (1), a slide plate (2), a sliding piece (3), a top plate (4), a guide plate (6), a vertical plate (7), and an arc-shaped pipe support (5); the bottom plate (1) is fixedly connected to the upper surface of the pipe support; the slide plate (2) is connected to the upper surface of the bottom plate (1); the upper part of the vertical plate (7) is an arc-shaped structure, and the arc-shaped pipe support (5) is fixedly connected to the upper arc-shaped surface of the vertical plate (7); the arc-shaped pipe support (5) is supported on the bottom of the horizontal smoke and air duct (8); the bottom of the vertical plate (7) is fixedly connected to the upper surface of the top plate (4); the sliding piece (3) is fixedly connected to the middle part of the lower surface of the top plate (4), and the two sides of the lower surface of the top plate (4) are respectively fixedly connected with the guide plates (6), and the sliding piece (3) is placed on the slide plate (2) in an aligned manner so that the top plate (4) and the slide plate (2) can slide relative to each other; the two sides of the bottom plate (1) are in sliding contact with the inner sides of the guide plates (6) on both sides.

2. The one-way support for smoke and air duct used in a pulverized coal boiler smoke treatment system according to claim 1, characterized in that: The sliding sheet (3) is a stainless steel plate, and the sliding plate (2) is a polytetrafluoroethylene plate.

3. The one-way support for the smoke duct of a pulverized coal boiler smoke treatment system according to claim 2, characterized in that: The slide plate (2) is bonded to the upper surface of the bottom plate (1) by epoxy resin glue, and the sliding sheet (3) is welded to the middle of the lower surface of the top plate (4).

4. The one-way support for smoke and air duct used in a pulverized coal boiler smoke treatment system according to claim 1, characterized in that: The arc-shaped pipe support (5) is welded to the arc surface of the vertical plate (7).

5. The one-way support for smoke and air duct used in a pulverized coal boiler smoke treatment system according to claim 1, characterized in that: Guide plates (6) are respectively welded to both sides of the lower surface of the top plate (4).

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