CN2684026Y

CN2684026Y - Pulverized coal airflow gas-solid separating and concentrating unit using wedge shaped grating

Info

Publication number: CN2684026Y
Application number: CN 200420032503
Authority: CN
Inventors: 刘泰生; 叶恩清; 邓仲勇; 周武; 沈坚勇
Original assignee: Dongfang Boiler Science And Technology Development Co ltd Zigong; Dongfang Boiler Group Co Ltd
Current assignee: Dongfang Boiler Group Co Ltd
Priority date: 2004-01-12
Filing date: 2004-01-12
Publication date: 2005-03-09
Anticipated expiration: 2014-01-12

Abstract

The utility model belongs to a coal powder concentrator of gas and solid separation in match use with the pulverized coal boiler, the industrial furnace and the kiln, comprising a shell, the nozzles respectively arranged on the two ends, a joint of a first air inlet pipe, a hill body arranged in the inner cavity of the shell, wedge separation and concentration grids, a baffle and separation boards. The concentrator adopts the hill body with a streamline form surface and wedge grids as a gas and solid separation and coal powder concentration mechanism. The wedge baffle and the separation boards arranged at intervals are adopted as a flow separation mechanism and the inner wall of the cavity and the surfaces of the hill body, the wedge bars, the baffle and the separation boards are additionally provided with abrasion proofing layers. Thus the utility model has simple structure, good coal powder concentration and gas and solid separation effect, reasonable gas flow distribution of the concentrated and diluted coal powder and long service life and can also effectively prevent the accidents of coal powder deposition and powder blocking and nozzle burning in the concentrator. The defects that the concentration and the gas and solid separation effect is poor, the accidents of powder blocking and nozzle burning are easy to occur and the gas flow distribution of the concentrated and dilute coal powder is unreasonable in the background art are overcome.

Description

Wedge shape grid breeze airflow gas, the solid separation and enrichment facility

Technical field

It is supporting with gas, separate and the Pulverized Coal Concentration device admittedly that the utility model belongs to a kind of and pulverized-coal fired boiler, industrial furnace, kiln.Particularly a kind of enrichment facility that adopts the wedge shape grid as gas, solid separation and Pulverized Coal Concentration mechanism.

Background technology

At present, concentrated pulverized fuel combustion obtains using comparatively widely at pulverized-coal fired boiler, industrial furnace and kiln.Conventional with the matched gas of pulverized-coal fired boiler, separate with the Pulverized Coal Concentration device and generally adopt elbow type or vane type device admittedly.Wherein elbow type separate, enrichment facility be utilize coal dust particle through elbow the time because the inertia of gas, solid two-phase is different separates and concentrate, thereby existence separates and concentrated effect is poor, cocnentration factor is little, and set blade is big to gas-flow resistance in the elbow, and the wearing and tearing of blade are also more serious.At above-mentioned disadvantage, in the patent No. is ZL93209806.1, denomination of invention is in the patent documentation of " louver pulverized coal concentrator ", discloses and a kind of the louvre type gas be made up of 3-11 concentrated grid has been set between shunting plate washer and the air flow inlet of air flow outlet in the inspissator housing, separated admittedly and concentrated mechanism.Though this device has characteristics such as structure is simple relatively, resistance is less relatively.But owing to concentrate grid is simple flat plate shape structure, distance between each screen is less, air-flow will form the extremely low larger area reflux pressure of flow velocity behind screen when flowing through screen at different levels, the formation of this recirculating zone, one will cause the coal dust deposition, and then cause the generation of accidents such as stifled powder of inspissator and spout scaling loss; Its two, increased the resistance of air-flow in the thin powdered coal gas channel again, both influenced concentrated effect, influence dense, thin powdered coal air-flow flow reasonable distribution again in the exit.Thereby this type of separation, enrichment facility still exist and separate and stifled powder of relatively poor, the easy generation of concentrated effect and spout burning damage accident, defectives such as thin powdered coal, gas channel resistance are still big, spout place bias pulverized coal distribution of air flow ratio susceptible to.

Summary of the invention

The purpose of this utility model is the defective that exists at background technology, improve a kind of wedge shape grid breeze airflow gas of design, the solid separation and enrichment facility, improve gas, solid separation and concentrated effect and service life of equipment to reach, reduce gas-flow resistance, effectively prevent the deposition of coal dust in inspissator, avoid the generation of stifled powder and spout burning damage accident, guarantee purposes such as the exit is dense, the pro rate of thin powdered coal air-flow is reasonable.

Solution of the present utility model is in inspissator housing porch one side one mound body to be set, and to shift to install its cross section between mound body and plate washer be the wedge shape grizzly bar as gas, the solid separation and concentrated grid, adopt plate washer and dividing plate cascaded structure as the combined type diversion mechanism simultaneously, its inner chamber front portion (spout end) is separated into left and right two parts, respectively as dense, thin powdered coal air stream outlet passage, thereby realize its purpose.Therefore, the utility model comprises housing and is located at the spout of housing front end and the primary air intake pipe joint of rear end, is located at separation and the concentrated grid and the diversion mechanism of housing inner chamber; Key is also to be provided with a mound body at the influent stream end of housing inner chamber; The grizzly bar that form to separate and concentrate grid is the wedge shape grizzly bar, the diversion mechanism combined type diversion mechanism that the plate washer that is obliquely installed and dividing plate are in series of then serving as reasons; Mound body, each wedge shape grizzly bar and plate washer and dividing plate all are vertical in the housing inner chamber, wherein mound body and each wedge shape grizzly bar are positioned at the same side of inner chamber, the upper/lower terminal of each wedge shape grizzly bar, dividing plate and plate washer is tightened to one with the upper and lower casing inwall respectively, and the mound body then is tightened to one with a sidewall and the upper and lower inwall of housing inner chamber.Dividing plate in the above-mentioned diversion mechanism is the two-part dividing plate, and forward and backward two sections dividing plates all are positioned at the setting of the vertical plane of symmetry location interval of housing.And the key groove of the windward side angle of attack of described mound body and each wedge shape grizzly bar is 10 °-45 °.In order effectively to prolong its working life, all be embedded on enrichment facility inner walls, mound body, plate washer, baffle surface and wedge shape grizzly bar two inclined-planes or surfacing a wearing layer.And the wedge shape grizzly bar of forming gas, solid separation and concentrated grid is the 2-5 bar.

The utility model is owing to adopt mound body and wedge shape grizzly bar as the gas of breeze airflow, the solid separation and Pulverized Coal Concentration mechanism, gas, the solid separation and the Pulverized Coal Concentration effect had both been improved, avoided the generation of recirculating zone, the grizzly bar back side again, reduced the drag losses of inspissator greatly, effectively prevented coal dust deposition, stop up light side breeze airflow passage, and then defective such as spout burning damage accident takes place; Set up wearing layer in mound body, grizzly bar and plate washer, baffle surface and can effectively improve performance, the prolongation working life that its anti-breeze airflow washes away.Therefore, the utlity model has simple in structure, Pulverized Coal Concentration and gas, solid good separating effect, long service life also can effectively prevent the characteristics such as generation of the deposition of coal dust in the enrichment facility, stifled powder and spout burning damage accident.

Accompanying drawing and description of drawings

Fig. 1, be the utility model structural representation (horizontal cross);

Fig. 2, be the A-A view;

Fig. 3 is the B-B view.

Among the figure: 1, housing, 2, spout, 3, preceding dividing plate, 4, rear bulkhead, 5, plate washer, 6, the wedge shape grizzly bar, 7, the mound body, 8, the primary air intake pipe joint, 9, wearing layer.

Embodiment

Present embodiment housing 1, long 1275mm, the long 972mm of main body wherein, intracavity section amasss 295 * 295mm (wide * height), wall thickness 30mm; Spout 2 effective long 224mm, oral area sectional area 320 * 320mm (wide * height); Primary air intake pipe joint 8 long 210mm, the entrance point cross section is identical with the housing inner chamber; Body 7 cross sections in mound are isosceles triangle, the thick 60mm in top, and two inclined-planes are wide respectively to be 142mm, high identical with housing inner chamber height, strikes up partnership with upper and lower inwall of inner chamber and sidewall weldering; Wedge shape grizzly bar 6 present embodiments are established 2, and all adopting cross section is leg-of-mutton practical bar, and each inclined-plane is wide also to be 142mm, 25 ℃ of key grooves; Plate washer 5 wide 200mm, thick 30mm, 15 ° at inclination angle; Rear bulkhead 4 wide 299mm, thick 25mm; Preceding dividing plate 3 wide 180mm, thick 25mm; The upper/lower terminal of wedge shape grizzly bar 6, plate washer 5 and forward and backward dividing plate 3,4 respectively with housing in top of chamber and bottom integrally welded.Present embodiment is in order to improve its service life, at forward and backward dividing plate 3,4, and the surface of plate washer 5, the inwall of the forward and backward inclined-plane of each wedge shape grizzly bar 6 and mound body 7 and housing 1, spout 2, primary air intake pipe, all cemented carbide powder of surfacing one bed thickness 0.7mm.

Claims

1, a kind of wedge shape grid breeze airflow gas, the solid separation and enrichment facility, comprises housing and be located at the spout of housing front end and the primary air intake pipe joint of rear end, be located at the gas of housing inner chamber, the solid separation and concentrated grid and diversion mechanism; It is characterized in that also being provided with a mound body at the influent stream end of housing inner chamber; Form gas, the solid grizzly bar that separates and concentrate grid is the wedge shape grizzly bar, the combined type diversion mechanism that diversion mechanism then is in series for the plate washer that is obliquely installed and dividing plate; Mound body, each wedge shape grizzly bar and plate washer and dividing plate all are vertical in the housing inner chamber, wherein mound body and each grizzly bar are positioned at the same side of inner chamber, each wedge shape grizzly bar, dividing plate and plate washer upper/lower terminal are tightened to one with the upper and lower casing inwall respectively, and the mound body then is tightened to one with a sidewall and the upper and lower inwall of housing inner chamber.

2, by the described wedge shape grid of claim 1 breeze airflow gas, the solid separation and enrichment facility; It is characterized in that the dividing plate in the diversion mechanism is the two-part dividing plate, forward and backward two sections dividing plates all are positioned at the setting of the vertical plane of symmetry location interval of housing.

3, by the described wedge shape grid of claim 1 breeze airflow gas, the solid separation and enrichment facility; It is characterized in that the windward side of described mound body and the key groove of each wedge shape grizzly bar are 10 °-45 °.

4, by the described wedge shape grid of claim 1 breeze airflow gas, the solid separation and enrichment facility; It is characterized in that all being embedded on enrichment facility inner walls, mound body, plate washer, baffle surface and wedge shape grizzly bar two inclined-planes or surfacing one deck wearing layer.

5, by the described wedge shape grid of claim 1 breeze airflow gas, the solid separation and enrichment facility; It is characterized in that the wedge shape grizzly bar of forming gas, solid separation and concentrating grid is the 2-5 bar.