CN2087765U

CN2087765U - Air and water double-cooled type slag-cooling device

Info

Publication number: CN2087765U
Application number: CN 91200199
Authority: CN
Inventors: 赵广播; 秦裕琨; 陈崇枢; 暴中玉; 陆慧林
Original assignee: Harbin Institute of Technology
Current assignee: Harbin Institute of Technology
Priority date: 1991-01-04
Filing date: 1991-01-04
Publication date: 1991-10-30

Abstract

The utility model relates to a double-cooled type slag-cooling device with double cooling heat-transfer methods of air cooling and water cooling simultaneously, which is a boiling bed with a buried pipe heating surface. The utility model comprises an air inlet box, an air-distribution device, a hot air outlet, a buried pipe, a partition wall, etc. The slag-cooling device utilizes the high heat transfer coefficient of the boiling bed, good granules fluidity, and good heat absorptivity of water to cool more flooding ash in minor bed volume, increasing boiler thermal efficiency and saving energy to realize the dry-type removal of slag, keep the activity of the flooding ash, and be conveniently utilized comprehensively.

Description

Air and water double-cooled type slag-cooling device

The utility model relates to a kind of device of cooling pan slag.

Press the cooling medium difference, can be divided into three kinds of water-cooled, air-cooled, coal cold types having slag cooler now.

The water-cooled slag cooler is the surface-type slag cooler again, and high temperature overflow ash is from an effluent mistake of pipe, by heat being passed to the water of managing opposite side with the transmission of heat by contact of tube wall.This slag cooler is simple in structure, the heat that water reclaims almost all is used effectively, but because the heat transfer coefficient between overflow ash and the water is lower, the part heating surface does not reach mobile lime-ash in addition, it is very big to want that the overflow ash is cooled to the heating surface area that lower temperature needs, make slag cooler bulky, difficult arrangement.In addition, in the overflow ash if any clinker, easy cramming, and stop up later clinker and be difficult to remove, more than 2 uses that limit this slag cooler.

Air-cooled slag cooler is to cool off the overflow ash with cold air, the major defect of this slag cooler is that the cold air amount that needs is bigger, because the air capacity that slag cooler needs is big, air after being heated is difficult for being sent in the burner hearth, if send into the afterbody convection pass, so some is reclaimed later heat by air and fall, reduced the effective rate of utilization of overflow ash physics heat with flue gas loss.

Coal cold type slag cooler generally adopts the strand basket structure, and the overflow ash flows through in the screw shaft of strand cage, and coal is carried with the strand cage, the heat transferred coal of high temperature overflow ash, coal is carried out drying and heating by screw shaft.

Along with the raising of fluidized bed furnace capacity and the development of fuel fluidized bed furnace, the overflow ash amount that the separate unit boiler need cool off is more and more, and above-mentioned three kinds of pattern slag coolers can not meet the demands.

The purpose of this utility model is a kind of slag cooler that cools off relatively large overflow ash of design, and makes the slag cooler reliable operation, and overflow ash sensible heat utilization rate is higher.

The utility model is by charging aperture 1, slag-drip opening 8, inlet box 6, air-distribution device 4, hot-blast outlet 10, pipe laying 2, collection case 3, partition wall 7, compositions such as body of wall 9 and steelframe 5.Wherein, slag inlet 1, partition wall 7, the brick one-tenth of body of wall 9, remainder is all made of metal.Air-distribution device 4 is supported on the steelframe 5, and inlet box 6 is welded together with air-distribution device 4, and partition wall 7 is built by laying bricks or stones on air-distribution device 4, and two ends and body of wall 9 join.Pipe laying 2 is one group of coiled pipe, is arranged in the ebullated bed 11, and the coiled pipe elbow part is built in body of wall, and hot-blast outlet 10 and the outlet 8 of cold slag are joined with body of wall 9, and the pipe laying two ends link with the collection case.

Geomantic omen co-cooling cold slag device is actually the ebullated bed that has the pipe laying heating surface, the overflow ash of discharging from the fluidized bed furnace overfall enters first ebullated bed of slag cooler by slag inlet 1, an ash liberated heat part is passed to fluidizing agent---air, another part is passed to the water in the pipe laying, the lime-ash that comes out from first ebullated bed enters second ebullated bed by the partition wall upper edge, enter again in the 3rd ebullated bed, discharge slag cooler from slag-drip opening 8 at last.

This slag cooler has utilized ebullated bed heat transfer coefficient height, characteristic that mobility of particle is good, but slag device heat transfer coefficient is little both to have overcome water-cooled, the shortcoming that lime-ash blocks easily, avoided the excessive deficiency of air-cooled cold slag cooling air quantity again, wherein the heat of water absorption can all be utilized, and the heat of absorption of air, because air capacity reduces the also corresponding minimizing of the heat that loses.

Owing to adopt many parallel-connection structures, each overflow grey particle time of staying in slag cooler is tending towards evenly, can avoid the uneven problem of each overflow grey particle cooling degree effectively; Many are arranged in parallel and have also improved the heat transfer temperature and pressure, can make slag cooler cool off more overflow ash in less bed volume.

In the coal reserves of China, colm occupies significant proportion, therefore develops the fluidized bed furnace that uses inferior fuel in China and has bright prospects, and there are some problems in the fluidized bed furnace that uses inferior fuel, and one of problem is exactly that overflow ash physics heat loss is bigger.

Overflow ash physics heat is reclaimed, can improve boiler thermal output, energy savings.Simultaneously, can realize dry slag disposal, keep the overflow ash active, make comprehensive utilization in lime-ash.

Geomantic omen co-cooling cold slag device can be used on the fluidized bed furnace of various capacity.

Description of drawings:

Accompanying drawing is the structure principle chart of the utility model slag cooler.

1 slag inlet among the figure, 2 pipe layings, 3 collection casees, 4 air-distribution devices, 5 steelframes, 6 inlet boxes, 7 cells, 8 slag-drip openings, 9 bodies of wall, hot-blast outlet 10.

Claims

1, a kind of geomantic omen co-cooling cold slag device, comprise charging aperture 1, slag-drip opening 8, collection case 3, partition wall 7, body of wall 9 and steelframe 5 is characterized in that this slag cooler adopts water-cooled and air-cooled two kinds of Cooling Heat Transfer ways of recycling simultaneously, and air-cooled part comprises inlet box 6, air-distribution device 4, hot-blast outlet 10, water-cooled partly comprise pipe laying and cooling water wherein, and wherein slag inlet 1, partition wall 7, the brick one-tenth of body of wall 9, remainder are all made of metal, and air-distribution device 4 is supported on the steelframe 5, inlet box 6 is welded together with air-distribution device 4, partition wall 7 is built by laying bricks or stones on air-distribution device 4, and two ends and body of wall 9 join, and pipe laying 2 is one group of coiled pipe, be arranged in the ebullated bed 11, the coiled pipe elbow part is built in body of wall, and hot-blast outlet 10 and the outlet 8 of cold slag are joined with body of wall 9, and the wall coil two ends link with the collection case.