CN203431845U - Antiwear structure for circulating fluidized bed boiler (CFBB) - Google Patents
Antiwear structure for circulating fluidized bed boiler (CFBB) Download PDFInfo
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- CN203431845U CN203431845U CN201320455784.8U CN201320455784U CN203431845U CN 203431845 U CN203431845 U CN 203431845U CN 201320455784 U CN201320455784 U CN 201320455784U CN 203431845 U CN203431845 U CN 203431845U
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Abstract
The utility model discloses an antiwear structure for a circulating fluidized bed boiler (CFBB), belonging to the field of CFBBs. The antiwear structure can slow down the rate of wear of the inner sides of water-cooled walls. The antiwear structure comprises a plurality of pipelines, a plurality of fins, connecting pieces and fireproof material, wherein the pipelines are arranged along the four sides of a rectangle in parallel and at intervals; the fins are arranged between the adjacent pipelines; the fins are connected with the pipelines to form water-cooled walls with front walls, rear walls and two side walls; the inside bottoms of the water-cooled walls are covered by fireproof layers; the connecting pieces are arranged at the inside lower parts of the water-cooled walls and above the fireproof layers and are connected with the fins; the fireproof material is knotted on the connecting pieces to form U-shaped antiwear beams covering the rear walls and two side walls of the water-cooled walls; the planes formed by the U-shaped antiwear beams are vertical to the axes of the water-cooled walls. The antiwear structure can be arranged in a hearth of the FBB.
Description
Technical field
The utility model relates to CFBB field, relates in particular to a kind of Cycle Fluid Bed Boiler Antiwear damage structure.
Background technology
Circulating fluidized bed technique is a kind of efficient, the clean burning technology growing up nearly decades, in the nearly more than ten years with good load performance and wide in range fuel tolerance ， China, develops and promote raising rapidly.At station boiler, extensive utilization is obtained in the fields such as Industrial Boiler and offal treatment utilization, and develop to the large circulating fluidized bed boiler of tens multikilowatt scales, be conducive to the utilization of resources of low heat value coal, the Utilization of lime-ash also utilizes in very wide ， China energy resource structure and occupies quite large proportion.Particularly its environmental-protection function is very outstanding, in suppressing Air Pollutant Emission, more excellent compared with the combustion system of other stove.
Fluidisation is through the bed on air-distribution device, to be expected with certain speed by air-flow, makes material particles by looking the state of fluid in being transformed into contacting of air-flow.In fluid bed, do not depend primarily on the empty cross section speed of an interior air-flow, raising along with air velocity, air-flow produces drag force to material particles in bed and reaches balance with the gravity and the buoyancy that act on particle, and in bed, material is entered bubbling (boiling), saved to gush with turbulent bed state and reach fast fluidized bed state by stationary state.
Fluidized-bed combustion boiler combustion technology is to grow up on bubbling bed burning basis, and the fundamental difference of recycle combustion and bubbling bed combustion system is that solid material can realize repeatedly cycle and burn in fluid bed.
Existing circulating fluid bed boiler structure as shown in Figure 3, mainly comprises burner hearth, cyclone separator, back-end ductwork, material returning device, slag cooler and drum.Coal burning stove chamber inner combustion, in the bed that temperature that a large amount of grey particles that burning produces in the technological process of cycle fluidized-bed combustion boiler form is relatively low 890 ℃, the choosing to take into account of this temperature improved efficiency of combustion and desulfuration efficiency.The smoke gas flow that these solids are produced by a wind by air-distribution device is suspended in burner hearth, and burner hearth is sent in Secondary Air layering, realizes fractional combustion.
Cyclone separator most solids are separated from (gas-solid) two phase flow after by material returning device by from newly sending hearth combustion back to.Form like this CFBB major loop.Major loop feature: strong disturbance and mixing, the interior circulation of high solid particle concentration and outer circulation, the sliding velocity of high solid/gas and the time of staying of long period, above feature is that burning and heat transfer have had necessary and sufficient condition, long period stop due to high solid concentration, for the wearing and tearing of tube wall face provide basic physical condition, burner hearth is the most serious part of wearing and tearing.
As shown in Figure 2, the wall of surrounding is water-cooling wall to burner hearth internal structure, and water-cooling wall comprises some pipelines and some fins, and along four limits of rectangle, parallel and interval arranges each part pipeline, and fin is between adjacent channel, and fin and pipeline are connected to form airtight structure.Water-cooling wall outside is surrounded by heat-insulation layer, and inside bottom is coated with flame retardant coating.Water-cooling wall inside bottom is better because being coated with flame retardant coating abrasion condition, but inside more than flame retardant coating water-cooling wall because of and the direct contact wear of ash content of mobile coal and coal serious.
Utility model content
The technical problems to be solved in the utility model is: provide a kind of water-cooling wall inner side of can slowing down at the Cycle Fluid Bed Boiler Antiwear damage structure of the part rate of wear on flame retardant coating top.
For addressing the above problem the technical scheme of employing, be: Cycle Fluid Bed Boiler Antiwear damage structure comprises some pipelines and some fins, along four limits of rectangle, parallel and interval arranges each part pipeline, fin is between adjacent channel, fin and pipeline are connected to form has water-cooled ancient piece of jade, round, flat and with a hole in its centre antetheca, a water-cooled ancient piece of jade, round, flat and with a hole in its centre for water-cooled ancient piece of jade, round, flat and with a hole in its centre rear wall and two water-cooled ancient piece of jade, round, flat and with a hole in its centre sidewalls, water-cooled ancient piece of jade, round, flat and with a hole in its centre inside bottom is coated with flame retardant coating, Cycle Fluid Bed Boiler Antiwear damage structure also comprises connector and refractory material, connector is positioned at water-cooled ancient piece of jade, round, flat and with a hole in its centre lower inside and is positioned at flame retardant coating top, connector is connected with fin, refractory material is tied a knot and on connector, is formed the U-shaped abrasionproof beam that covers water-cooled ancient piece of jade, round, flat and with a hole in its centre rear wall and two water-cooled ancient piece of jade, round, flat and with a hole in its centre sidewalls, the face that U-shaped abrasionproof beam forms is perpendicular to water-cooled ancient piece of jade, round, flat and with a hole in its centre axis.
Further: U-shaped abrasionproof beam comprises dilatation joint.
Further: comprise at least three road spaced U-shaped abrasionproof beams.
Further: connector is perpendicular to fin, and connector shape of cross section is Z-shaped.
Further: water-cooled ancient piece of jade, round, flat and with a hole in its centre medial surface is coated with scuff-resistant coating.
The beneficial effects of the utility model are: according to detecting water-cooling wall wall thickness, in flame retardant coating top part in fire-resistant floor height 5m, pipe wear speed is bigger than normal compared with other regions, the main cause local ash-laden gas that to be lower furnace portion flame retardant coating and water-cooling wall transition region form due to the variation of cross-section relation produces motion " swirling flow ", in order to eliminate the strong planing effect that this swirling flow causes water-cooling wall and to control the speed of the solid particle stream moving downward along wall-cooling surface, slow down the shock cutting wearing and tearing that the impact on some ridge causes water-cooling wall.Therefore, at flame retardant coating terminated line, start up to arrange abrasionproof beam, to control the speed of the solid particle moving downward along wall-cooling surface, realize step by step short-range soft landing and change local " swirling flow " direction, thereby can slow down the wearing and tearing to water-cooling wall.
Accompanying drawing explanation:
Fig. 1 is Cycle Fluid Bed Boiler Antiwear damage structure schematic diagram;
Fig. 2 is Cycle Fluid Bed Boiler Antiwear damage structure side view;
Fig. 3 is Cycle Fluid Bed Boiler Antiwear damage structure top view;
Fig. 4 burner hearth internal structure schematic diagram;
Fig. 5 CFBB outside drawing;
In figure, be labeled as: pipeline 1, fin 2, a water-cooled ancient piece of jade, round, flat and with a hole in its centre 3, U-shaped abrasionproof beam 4, connector 5, dilatation joint 6, refractory material 7, water-cooled ancient piece of jade, round, flat and with a hole in its centre rear wall 8, water-cooled ancient piece of jade, round, flat and with a hole in its centre sidewall 9, water-cooled ancient piece of jade, round, flat and with a hole in its centre antetheca 10.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is further illustrated.
Cycle Fluid Bed Boiler Antiwear damage structure comprises some pipelines 1 and some fins 2, along four limits of rectangle, parallel and interval arranges each part pipeline 1, fin 2 is between adjacent channel 1, fin 2 is connected to form and has water-cooled ancient piece of jade, round, flat and with a hole in its centre antetheca 10 with pipeline 1, a water-cooled ancient piece of jade, round, flat and with a hole in its centre 3 for water-cooled ancient piece of jade, round, flat and with a hole in its centre rear wall 8 and two water-cooled ancient piece of jade, round, flat and with a hole in its centre sidewalls 9, a water-cooled ancient piece of jade, round, flat and with a hole in its centre 3 inside bottom are coated with flame retardant coating, circulation fluidized bed boiler anti-wear structure also comprises connector 5 and refractory material 7, connector 5 is positioned at a water-cooled ancient piece of jade, round, flat and with a hole in its centre 3 lower inside and is positioned at flame retardant coating top, connector 5 is connected with fin 2, refractory material 7 is tied a knot and on connector 5, is formed the U-shaped abrasionproof beam 4 that covers water-cooled ancient piece of jade, round, flat and with a hole in its centre rear wall 8 and two water-cooled ancient piece of jade, round, flat and with a hole in its centre sidewalls 9, the face that U-shaped abrasionproof beam 4 forms is perpendicular to a water-cooled ancient piece of jade, round, flat and with a hole in its centre 3 axis.U-shaped abrasionproof beam 4 recommends to be arranged on the most serious region of a water-cooled ancient piece of jade, round, flat and with a hole in its centre 3 medial surface wearing and tearing in fire-resistant floor height 5m.Abrasionproof beam (thereby U-shaped abrasionproof beam 4 becomes annular abrasionproof beam) also can be set on water-cooled ancient piece of jade, round, flat and with a hole in its centre antetheca 10, but practice shows 10 wearing and tearing of water-cooled ancient piece of jade, round, flat and with a hole in its centre antetheca relatively and is not serious, in order to save material and duration the utility model, on water-cooled ancient piece of jade, round, flat and with a hole in its centre antetheca 10, abrasionproof beam is not set.Connector 5 for being recommended as welding, it should be noted that connector 5 should only be connected with fin 2, is not connected with pipeline 1 with the connected mode of fin 2.
According to detecting water-cooling wall wall thickness, in flame retardant coating top part in fire-resistant floor height 5m, pipe wear speed is bigger than normal compared with other regions, the main cause local ash-laden gas that to be lower furnace portion flame retardant coating and water-cooling wall transition region form due to the variation of cross-section relation produces motion " swirling flow ", in order to eliminate the strong planing effect that this swirling flow causes water-cooling wall 3 and to control along the face down speed of the solid particle stream that moves of water-cooling wall 3, slow down the shock cutting wearing and tearing that the impact on some ridge causes water-cooling wall 3.Therefore, at flame retardant coating terminated line, start up to arrange hoop abrasionproof beam 4, to control along the face down speed of the solid particle that moves of water-cooling wall 3, realize step by step short-range soft landing and change local " swirling flow " direction, thereby can slow down the wearing and tearing to water-cooling wall 3.
According to principle of expanding with heat and contracting with cold, U-shaped abrasionproof beam 4 is heated and can extends, if the space that the not reserved heat of U-shaped abrasionproof beam 4 rises can produce internal stress, this internal stress may cause U-shaped abrasionproof beam 4 to damage.For fear of above-mentioned situation, occur, U-shaped abrasionproof beam 4 comprises dilatation joint 6, and U-shaped abrasionproof beam 4 is divided into some sections, every intersegmental gapped, has the space of elongation after U-shaped abrasionproof beam 4 heat expansions.
In order better to slow down water-cooling wall inner side in the part rate of wear on flame retardant coating top, Cycle Fluid Bed Boiler Antiwear damage structure comprises at least three road spaced U-shaped abrasionproof beams 4.Multi-way U-shaped abrasionproof beam 4 is set and is more conducive to eliminate the strong planing effect that the swirling flow of cloud of dust gas causes water-cooling wall and the speed of controlling the solid particle stream moving downward along wall-cooling surface, slow down the shock cutting wearing and tearing that the impact on some ridge causes water-cooling wall, thereby better slow down water-cooling wall inner side in the part rate of wear on flame retardant coating top.
In order further to slow down water-cooling wall 3 inner sides in the part rate of wear on flame retardant coating top, a water-cooled ancient piece of jade, round, flat and with a hole in its centre 3 medial surfaces are coated with scuff-resistant coating.Scuff-resistant coating can play the effect that slows down pipeline 1 wearing and tearing within certain cycle of operation, and cost is low, duration is short, each high-power station generally adopts in the abrasionproof work of heating surface, scuff-resistant coating spraying recommend adoption Ultrasonic Arc Sprayed Anti-wear Technology, Ultrasonic Arc Sprayed adopts hardness high especially, the HDS88A filamentary cermet material of wear-resistant and high temperature oxidation corrosion resistance excellent performance, wherein contained Ni element has good ductility, make scuff-resistant coating and pipeline 1 have almost identical thermal coefficient of expansion, avoided the scuff-resistant coating cracking causing due to thermal stress and peeled off, scuff-resistant coating THICKNESS CONTROL is at 0.5-0.8mm, scuff-resistant coating thickness surpasses 0.8mm, scuff-resistant coating and pipeline basic unit are that physical bond coating is easily stripped off.
Claims (5)
1. Cycle Fluid Bed Boiler Antiwear damage structure, comprise some pipelines (1) and some fins (2), along four limits of rectangle, parallel and interval arranges each part pipeline (1), fin (2) is positioned between adjacent channel (1), fin (2) is connected to form and has water-cooled ancient piece of jade, round, flat and with a hole in its centre antetheca (10) with pipeline (1), a water-cooled ancient piece of jade, round, flat and with a hole in its centre (3) for water-cooled ancient piece of jade, round, flat and with a hole in its centre rear wall (8) and two water-cooled ancient piece of jade, round, flat and with a hole in its centre sidewalls (9), a water-cooled ancient piece of jade, round, flat and with a hole in its centre (3) inside bottom is coated with flame retardant coating, it is characterized in that: comprise connector (5) and refractory material (7), connector (5) is positioned at a water-cooled ancient piece of jade, round, flat and with a hole in its centre (3) lower inside and is positioned at flame retardant coating top, connector (5) is connected with fin (2), refractory material (7) is tied a knot in the upper U-shaped abrasionproof beam (4) that covers water-cooled ancient piece of jade, round, flat and with a hole in its centre rear wall (8) and two water-cooled ancient piece of jade, round, flat and with a hole in its centre sidewalls (9) that forms of connector (5), the face that U-shaped abrasionproof beam (4) forms is perpendicular to a water-cooled ancient piece of jade, round, flat and with a hole in its centre (3) axis.
2. Cycle Fluid Bed Boiler Antiwear damage structure according to claim 1, is characterized in that: U-shaped abrasionproof beam (4) comprises dilatation joint (6).
3. Cycle Fluid Bed Boiler Antiwear damage structure according to claim 2, is characterized in that: comprise at least three road spaced U-shaped abrasionproof beams (4).
4. Cycle Fluid Bed Boiler Antiwear damage structure according to claim 3, is characterized in that: connector (5) is perpendicular to fin (2), and connector (5) shape of cross section is Z-shaped.
5. Cycle Fluid Bed Boiler Antiwear damage structure according to claim 4, is characterized in that: a water-cooled ancient piece of jade, round, flat and with a hole in its centre (3) medial surface is coated with scuff-resistant coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320455784.8U CN203431845U (en) | 2013-07-29 | 2013-07-29 | Antiwear structure for circulating fluidized bed boiler (CFBB) |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320455784.8U CN203431845U (en) | 2013-07-29 | 2013-07-29 | Antiwear structure for circulating fluidized bed boiler (CFBB) |
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| CN203431845U true CN203431845U (en) | 2014-02-12 |
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| CN201320455784.8U Expired - Fee Related CN203431845U (en) | 2013-07-29 | 2013-07-29 | Antiwear structure for circulating fluidized bed boiler (CFBB) |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106051753A (en) * | 2016-07-16 | 2016-10-26 | 广东粤电湛江生物质发电有限公司 | Internally-circulating flowing choking and buffering type biomass circulating fluidized bed |
| CN111678110A (en) * | 2020-06-16 | 2020-09-18 | 四川陆亨能源科技有限公司 | Efficient anti-abrasion compact waste heat boiler applied to industrial silicon furnace |
-
2013
- 2013-07-29 CN CN201320455784.8U patent/CN203431845U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106051753A (en) * | 2016-07-16 | 2016-10-26 | 广东粤电湛江生物质发电有限公司 | Internally-circulating flowing choking and buffering type biomass circulating fluidized bed |
| CN111678110A (en) * | 2020-06-16 | 2020-09-18 | 四川陆亨能源科技有限公司 | Efficient anti-abrasion compact waste heat boiler applied to industrial silicon furnace |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140212 Termination date: 20150729 |
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| EXPY | Termination of patent right or utility model |