CN2151364Y - Self cycling boiler heated by waste sulfuric acid - Google Patents

Abstract

The utility model discloses a nature-cycling sulfuric-acid waste-heat boiler. A W-shaped boiler with four flues is composed of a drum (1), a connecting pipe (2), a header (3), a convection heating surface (4), a super-heater (5), a mechanical vibrating and hitting ash cleaner (6), a steel frame platform (7) and a water-cooled wall (8). The W-shaped boiler with four flues is characterized in that the inner part of a first flue is arranged into a hollow chamber which is surrounded by the water-cooled wall, the super-heater is arranged in a second flue, the convection heating surface is welded with the drum through the header and the connecting pipe, and the mechanical vibrating and hitting ash cleaner is arranged on the steel frame platform of a boiler wall. The utility model has the advantages of low failure rate, long service life and convenient maintenance.

Description

Self cycling boiler heated by waste sulfuric acid

The utility model Natural Circulation exhaust heat of vitriol boiler relates to the boiler technology field, is applicable to the boiler of the Natural Circulation used heat of sulfuric acid preparation system.

In the sulfuric acid preparation process, carry out roasting to troilite, to produce 900 ℃ high temperature during roasting and contain mine dust 300g/Nm ³The high concentration corrosive fume, exhaust heat of vitriol boiler is exactly to be used for absorbing the device that steam ， And that the used heat in the flue gas produces removes most of mine dust.Several forms of Natural Circulation waste heat boiler are disclosed in magazine " sulfuric acid industry " second phase in 1992 " the domestic and international development summary of a pyrite-based sulfuric acid production waste heat boiler " literary composition, and typical version is by drum, tube connector, collection case, convection heating surface, and superheater, steelframe platform, water-cooling wall and four flues are formed.Wherein superheater all is mounted in first flue, directly is subjected to the sweep of gases into furnace high-temperature and high mine dust density, and it is abominable to exist service condition, and erosion corrosion is serious.The fault rate height, pipe explosion accident takes place easily, and service life short (generally only have some months to 1 year time), particularly drum is the situation that adopts expanded joint to be connected with convection heating surface, this natural circulation waste-heat boiler also exists inconvenience mechanical ash removal equipment for flapping is installed simultaneously, the problem of maintenance renewal part difficulty.

The purpose of this utility model provides a kind of Natural Circulation exhaust heat of vitriol boiler, uses this boiler and can keep the highly effective and safe operation, has long service life (3-5), and fault rate is low, is convenient to the purpose of Maintenance and Repair.

The design (Fig. 1) of the utility model Natural Circulation exhaust heat of vitriol boiler is: constitute " W " type by drum (1), tube connector (2), collection case (3), convection heating surface (4), superheater (5), mechanical vibrator deashing device (6), steelframe platform (7), water-cooling wall (8), first flue (9), second flue (10), the 3rd flue (11), the 4th flue (12).The I and II superheater that the main points of the utility model design are 1, will be installed in first flue (9) originally is displaced in second flue, makes first flue be mounted to the empty chamber that is surrounded by water-cooling wall, promptly as expansion chamber.The high temperature that enters first flue like this contains mine dust 300g/Nm ³The high concentration corrosive fume, can through around water-cooling wall absorb heat.Flue-gas temperature is descended 100 ℃, again owing to slow down and turn 180 ° and enter second flue (10) again and both superheater (5) was installed in second flue (10), mine dust continues during through second flue to reduce, can make raw ore reduce 70% especially, the condition of work that this has just improved superheater enables to reach the design of highly effective and safe operation continuous operation more than three to five years.2, drum (1) is installed in outside the body of heater flue heat affected zone, at the upper position ， of flue And convection heating surface (4) is welded with drum (2) by collection case (3) and tube connector (2) and make.Facilitate installation, maintenance and renewal part like this, can mechanical rapping apparatus (6) be installed on the steelframe platform successfully, the dust stratification of boiler heating surface appearance is eliminated in running at any time, thus the service life of having improved boiler.

The effect of the utility model Natural Circulation exhaust heat of vitriol boiler is: compare with existing Natural Circulation waste heat boiler.The utlity model has: 1, be installed in outside the heat affected zone owing to drum (1), and adopt heating surface by collection case (3) and tube connector (2) and drum welding, thereby reduced the fault rate of boiler, easy access, can be equipped with the mechanical vibrator deashing device, the dust stratification that can make the boiler heating surface appearance is removed in running at any time, has so just improved service life, can safe operation three to five years.2, owing to simple in structure, can make the steel of making boiler reduce to 88 tons for 1056 tons by the old product consumptive material, have low, the reliable advantage of cost.

Fig. 1 is the structure chart of the utility model Natural Circulation exhaust heat of vitriol boiler.

The embodiment of the utility model Natural Circulation exhaust heat of vitriol boiler is that drum (1) diameter of a DG8/38-2 type exhaust heat of vitriol boiler being installed by existing boiler technology production is 1200mm, adopts the boiler plate hot rolling of thickness 46mm to be welded into.Drum utilizes hanger device to be suspended on the top board.The boiler inner flue is " W " type, hot flue gas enters in the inherent flue of stove (9) and flows downward, in two flues (10), upwards flow, in three flues (11), flow downward again, in four floss holes, make progress again, after the membrane type cold wall (8) of outlet around discharging in boiler one flue adds band steel with φ 60 * 5mm high-pressure boiler steel pipe is welded into.Superheater (5) in two flues adopts the alloy pipe (12cr1MoV) of φ 42 * 5mm to be bent into coiled pipe and is welded.Three, the convection heating surface (4) in four flues adopts φ 32 * 6mm extended surface tube to add band steel to be welded into.Tube connector between drum and water-cooling wall, the convection heating surface (2) adopts the boiler tube of φ 108 * 12mm to bend, and what collection case (3) adopted is the manufacturing of φ 159 * 12mm boiler tube.Mechanical vibrator device (6) adopts Weight type regularly to clash into rapping, and its governing box model is the BWY2715 cycloidal planetary gear speed reducer.3 kilowatts of powers of motor.Steelframe platform (7) adopts high-quality shape steel assembly welding to form.Partition wall between each flue adopts refractory concrete prefabricated component and refractory brick to build by laying bricks or stones, and the outside body of heater of boiler adopts the insulation of litaflex felt light-weight walling material adiabatic.The weight of boiler all is suspended on the column, can guarantee the free wxpansion after each parts is heated when operation.This example drum setting height(from bottom) is a 11320mm(drum centre-height), body of heater length 7840mm, body of heater width 6560mm, Boiler Metallic weight is 88 tons, than the metal gross weight 103 of old product.Save steel 15% for 7 tons.

Claims (2)

1, a kind of Natural Circulation exhaust heat of vitriol boiler, constitute " W " type four flue boilers by drum (1), tube connector (2), collection case (3), convection heating surface (4), superheater (5), steelframe platform (7), water-cooling wall (8), it is characterized in that first flue is mounted to the empty chamber that is surrounded by water-cooling wall, convection heating surface (4) is welded with drum (1) by collection case (3) and tube connector (2), and mechanical vibrator deashing device (6) is installed on the steelframe platform of boiler wall.

2, waste heat boiler according to claim 1 is characterized in that mechanical vibrator deashing device (6) adopts Weight type regularly to clash into rapping, and its governing box model is the BWY2715 cycloidal planetary gear speed reducer, and power of motor is 3 kilowatts.

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