CN2265482Y

CN2265482Y - Blocking-resistance device for boiler air preheating device

Info

Publication number: CN2265482Y
Application number: CN 96213462
Authority: CN
Inventors: 朱祖柯
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-06-07
Filing date: 1996-06-07
Publication date: 1997-10-22
Anticipated expiration: 2006-06-07

Abstract

The utility model relates to a blockage resistant device for boiler air preheating devices, which is installed in an air preheating device. A floating wire frame 16 is additionally arranged on the upper part of the air preheating device, and the floating wire frame is hung on the upper part of the air preheating device through a hanger spring 18. An ash removing spring 19 whose lower end is provided with a weight dropper 23 in a hanging mode is installed in the smoke pipe 21 of the air preheating device. The perturbation action of smoke gas is utilized to make the floating wire frame and the ash removing spring generate sinking and floating vibration to ensure that powder coal ash attached to the inner part of the smoke pipe are scraped off continuously to achieve the purpose of the blockage resistance of the air preheating device.

Description

The boiler air preheater anti-block apparatus

The utility model relates to a kind of boiler air preheater anti-block apparatus.

Air preheater is a waste heat recovery apparatus in the boiler smoke system, and flue gas heat energy passes to cold air by the fume pipe tube wall, makes cold wind obtain preheating before entering burner hearth.Stop up because coal ash often takes place fume pipe, hinder the flue gas circulation.The mediation air preheater is abominable because of environment, and mediation work is very arduous.As not dredging for a long time, fume pipe is by blocked temporarily, and flue gas resistance increases, and boiler output descends, deterioration of efficiency.In order to prevent that flue gas from stopping up, usual practice is to strengthen fume pipe to stimulate the menstrual flow, though the method can be slowed down the stifled process of smoke pipe ash, shortcoming is that the air preheater heat exchange area reduces, the heat exchange effect variation, and exhaust gas temperature rises, and fuel availability reduces.Another kind of way is to adopt glass tube to serve as fume pipe to utilize the smooth characteristics of glass tube tube wall, and it is sticking long-pending that flyash is difficult in tube wall.Its shortcoming is the glass poor thermal conductivity, and heat exchange effect is bad, and exhaust gas temperature is also high.And Glass breadks easily, the installation and maintenance difficulty.

The utility model proposes a kind of boiler air preheater anti-block apparatus, be installed in the air preheater, utilize this device ash disposal spring to strike off and stick to coal ash in the smoke pipe.

The utility model purpose is such full pattern: set up unsteady rack 16, hanger spring 18 on air preheater top.Ash disposal spring 19 has been installed in the fume pipe 21, weight 23, the rack 16 that it is characterized in that floating is hung on the air preheater top suspension centre 4 by hanging extension spring 18, and ash disposal spring 19 is lifted on the rack 16 that floats.Spring 19 lower ends have lifted weight 23.Make the unsteady rack 16 that is hanging by means of the flue gas perturbed force, ash disposal spring 19 rates are given birth to the sink-float motion, and the coal ash that sticks to the fume pipe inwall spring 19 that vibrated up and down strikes off.Prevented the stifled ash of air preheater.

Fig. 1 is the attached view of air preheater

Fig. 2 is the attached view of air preheater anti-block apparatus

Fig. 3 is an air preheater anti-block apparatus front view

Fig. 4 is an air preheater anti-block apparatus side view

Fig. 5 is an air preheater anti-block apparatus cutaway view

Marginal data is as follows: the air preheater exhaust gases passes is made up of up to a hundred fume pipes 2 among Fig. 1, and fume pipe collection suitable for reading is welded on the tube sheet 1, hangs extension spring 3 and is used to lift the unsteady rack of anti-block apparatus.Longitudinal edge beam 6 among Fig. 2-4, vertical central sill 7, horizontal edge beam 8, horizontal central sill 9, vertical twine 10, horizontal twine 11 has been formed unsteady rack.This rack is lifted on the suspension centre 4 by hanger spring 5.Vertical twine 10, horizontal twine 11 is by fixing hole 15 fastening location.Ash disposal spring 12 upper ends are hung on the twine intersection point, and hang in air preheater 14 fume pipes.Weight 13 is lifted on ash disposal spring lower end.

Fig. 5 cuts open and has rolled over air preheater anti-block apparatus architectural feature and operation principle, and the rack 16 that floats is suspended on the corresponding suspension centre in air preheater top by hanging extension spring 18.Cavity is the second backhaul heat-exchanging chamber 25 between air preheater upper perforated plate 17 median septums 20, is the first backhaul heat-exchanging chamber 24 between lower perforated plate 22 and the median septum 20, and ash disposal spring 19 hangs in the fume pipe 21.The lower end has lifted weight 23.During boiler operatiopn, burning produces flue gas and from up to down flows in the air preheater fume pipe 21, by heat exchange heat-exchanging chamber 24,25 interior cold airs is heated.Because the cold wind import is in the first backhaul heat-exchanging chamber 24, fume pipe 21 cigarette temperature by cold air take away in a large number, temperature decrease in the fume pipe, SO2 gas is when touching the low tube wall of temperature in the flue gas, produce dewfall, flyash is disconnected down in the flue gas is clung by SO2 liquid point, in tube wall, form stifled ash,, be difficult to mediation so cold wind import department fume pipe is generally blocked.The anti-blocking principle of this device ash disposal is analyzed as can be known from Fig. 5: the rack 16 that floats is with the deadweight moment that is hung in up to a hundred ash disposal springs 19 on 16 and hang extension spring 18 pulling force institute balance, and extension spring 18 is in a certain attitude of presenting documents of drawing.When flue gas flows through, unsteady rack 16 and ash disposal spring 19 are driven by flue gas pressure reduction, make and hang extension spring 18 and be elongated a segment distance, rack 16, spring 19 has lost original balance, sedimentation downwards certain position, and produced the moving vibration of string thereupon, when shaking, will stick on the tube wall coal ash and be shaken and scrape off because of spring steel wire, when cigarette is pressed unexpected decline moment, flue gas is to rack 16, and spring 19 thrusts reduce makes extension spring 18 again, and spring 19 bounces back suddenly, under the gravity inertial effect, produced a string vibration again, another is scraped except sticking ash, as long as boiler is moving, this sink-float of going round and beginning again will ceaselessly continue, the bonding coal ash is constantly removed in the smoke pipe, thereby has reached anti-blocking purpose.Ash disposal spring 19 has certain interval with the smoke pipe inwall, although it is bigger that tube wall temperature descends, because of spring 19 all is immersed in the flue gas stream, spring metal basically with the flue gas isothermal, thereby can not produce the SO2 dewfall, this has dust adhesion promptly to be shaken to fall in failure of oscillation not is moving slightly to add spring.Essential implementation:

1. calculate float rack 16 and ash disposal bullet 19, weight 23 gross weights are calculated hanger spring 18 pulling force again, require gross weight and extension spring 18 draw the Shen distance when the static balance state greater than 5 centimetres.

2. ash disposal spring 19 the most handy stainless steel wire coilings, to increase the service life, the turn distance is good with 1.5-2.5 centimetre.

3. rack lower edge and the air preheater upper perforated plate distance of floating is controlled at 3 to 8 centimetres.

Spring 19 length requirements at static suspension status lower heavy punch 23 at a distance of lower perforated plate 22 spacings greater than 4 centimetres.

5. unsteady rack beam in length and breadth adopts unequal angle and band steel to fill the post of, and is guaranteeing that selection should be tried one's best lightly, and overall weight is alleviated as far as possible under the rack rigidity prerequisite.

6. floating rack beam 6.7.8.9 will be according to the blanking of air preheater actual size, and has bored twine fixing hole 15 by the fume pipe spacing.Make every lattice in length and breadth the twine intersection point just in time in alignment with the fume pipe center.Twine adopts 3 to 4 millimeters stainless steel wires, two end screw threads, and the fastening location of nut, and use the hammering die, prevent that nut from shaking, also available spot welding location.

7. this device is installed on the new clothes boiler, can be earlier that the rack that floats is prefabricated, integral installation is located again.On old boiler, install and then will after the boring loose mail be transported from the deashing fire door by the 6th requirement blanking, must be in stove assembly welding.

8. hanging extension spring 18 can utilize and be contained in economizer tube, air preheater top as sling point.

9. implementation procedure: A. presses the unsteady rack of air preheater actual size assembly welding, B. install twine, C. the bed hedgehopping rack is to proper height and be adjusted to level, D. regulating the rack position of floating makes each twine intersection point aim at every smoking pipe center, E., ash disposal spring 19 and weight 23 are installed, and be adjusted to the center, make its energy free lifting in fume pipe.F. find out with vertical line and hang extension spring sling point up and down, installation is hung extension spring and is adjusted expansive force and makes the rack that floats just break away from cushion block, spreads cushion block, presses rack can produce unsteady getting final product with have gentle hands.

Claims

1. boiler air preheater anti-block apparatus, be installed in the air preheater, be made up of unsteady rack (16) ash disposal spring (19) weight (23) of hanger spring (18), the rack (16) that it is characterized in that floating mounts on suspension centre (4) by hanging extension spring (18).Ash disposal spring (19) is lifted on the unsteady rack (16).

2. boiler air preheater anti-block apparatus has according to claim 1 installed vertical twine (10) and horizontal twine (11) on the rack that it is characterized in that floating.

3. boiler air preheater anti-block apparatus according to claim 1 is characterized in that ash disposal spring (19) lower end has lifted weight (23).