CN2525395Y

CN2525395Y - High efficiency cast iron screw thread fin air preheater

Info

Publication number: CN2525395Y
Application number: CN02213239U
Authority: CN
Inventors: 姜政华
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-03-07
Filing date: 2002-03-07
Publication date: 2002-12-11
Anticipated expiration: 2012-03-07

Abstract

The utility model discloses a high efficiency cast iron multi-head screw thread fin air preheater which is used in industrial boiler, small hydropower station boiler and industrial furnace. The utility model consists of a flue gas inlet, a smoke outlet, a cold air inlet, a hot air outlet and a box body composed of cast iron finned tubes (1). The box body can be one box or two or more than two boxes connected in series. The two ends of the cast iron finned tubes (1) are provided with semicircular sealing grooves (2), (5) and the middle part is provided with a flue gas circulation port (7). The utility model is peculiarly characterized in that the cast iron finned tubes (1) are provided with multi-head screw thread fins (4); that circular fins (3) are arranged outside the cast iron finned tubes (1); and that one end of each cast iron finned tube (1) is provided with a sealing ring (6) with smooth surface, wherein, one end of the sealing ring is square and the other end is circular. The utility model is an anti-wearing, anti-corrosion and anti-clogging high efficiency air preheater with great heat transfer capacity, great heat transfer coefficient and high efficiency. The air preheater has wide application range and is characterized by reliability, energy saving and long service life, and has the functions of reducing operation cost and labor intensity of stoker. So the utility model is a high efficiency air preheater with great practical value for popularization.

Description

A kind of efficient cast iron screw thread fin air preheater

(1) relate to the field:

The utility model relates to technical field of heat exchange, is the highly effective air preheater of the band multiple thread fin used of a kind of Industrial Boiler, small hydropower station boiler, industrial furnace specifically.

(2) background technology:

At present, China has reached 50.12 ten thousand in the Industrial Boiler installation total amount of usefulness, amounts to about 125.69 ten thousand and steams ton, and average operating thermal efficiency is about 60%; Unburned carbon loss with burning industrial boiler actual motion the time can reach 10-27%, heat loss due to exhaust gas depends primarily on the high and discharging exhaust gas volumn of exhaust gas temperature, China is a large amount of below 20 tons/do not install air preheater additional in hour assembling, fast-assembling Industrial Boiler, actual exhaust gas temperature is about 200-250 ℃, the exhaust gas temperature height, heat loss is big, thereby boiler installs air preheater additional, is important measures that improve boiler thermal output, save the energy.All add steel tubular air heater in the existing Industrial Boiler in bulk, heat pipe rib-type and intensified heat-transfer type cast-iron air preheater, but because boiler smoke contains a large amount of soot particles and sulfide gas, steel tubular air heater is serious because of erosion corrosion, life-span is short, heat pipe rib formula and cast iron type air preheater, because of reasons such as cigarette ash obstruction and manufacturing process complexity, thereby all fail to be applied in widely on assembling, the fast-assembling Industrial Boiler, a kind of anti-wear-resisting, anticorrosion, anti-clogging, heat output highly effective air preheater big, that improve heat transfer coefficient and efficient were not seen at present.

(3) summary of the invention:

The purpose of this utility model is intended to overcome the deficiency of above-mentioned prior art, and provides a kind of anti-wear-resisting, anticorrosion, anti-clogging, heat output highly effective air preheater big, that improve heat transfer coefficient and efficient not to see at present; The erosion corrosion that mainly solves existing air preheater is serious, and the life-span is short; Easily stopping up needs often to change air preheater, causes the problem of manpower, wealth, thing waste.

In order to achieve the above object, the utility model is achieved in that a kind of efficient cast iron screw thread fin air preheater, the casing that it comprises smoke inlet, exhanst gas outlet, cool air inlet, hot air outlet, is made up of cast iron finned tube 1, casing can be by a main box, also can be in series by two and plural casing,

semicircle seal groove

2,5 is established at cast iron finned tube 1 two ends respectively, flue gas communication port 7 is established in the centre, and its special character is to establish multiple thread fin 4 in the described cast iron finned tube 1.

To achieve these goals, a kind of efficient cast iron screw thread fin air preheater of the present utility model, its described cast iron finned tube 1 peripheral hardware hoop fin 3, an end of cast iron finned tube 1 is established end face sealing ring 6, and cast iron finned tube 1 one ends are square, and an end is circular.

Compared with the prior art the utility model has following good effect: 1, owing to be cast with the multiple thread fin in the pipe, increased heat exchange area, thereby heat output is big; 2, because the direct pouring of multiple thread fin on the inwall of cast iron pipe, makes flue gas stir at the pipe inside spin, prolong flue gas and conducted heat the time, improved heat transfer coefficient and efficient; 3, have good wear-resistant corrosion-resistantly, anti-dust stratification performance is good, and anti-clogging can be used for a long time, be steel tubular air heater service life 4-5 doubly; 4, flue gas circulation and circulation of air resistance are little, and after the efficient cast iron bull finned tube air preheater invention, original boiler induced-draft fan air quantity, blast are enough, need not change air-introduced machine, cut the waste; 5, because of long service life, safeguard and simply reduce the boiler operatiopn cost, alleviate fireman's labour intensity.

(4) description of drawings:

Fig. 1---a kind of structural representation of the present utility model;

Fig. 2---cast iron fin tube structure schematic diagram of the present utility model;

The cut-away view of Fig. 3---Fig. 2.

(5) specific embodiment:

In order to understand better and to implement, provide embodiment below in conjunction with accompanying drawing and describe a kind of efficient cast iron screw thread fin air preheater of the utility model in detail.

Embodiment, referring to Fig. 1,2,3, cylinder iron cast cast iron finned tube 1, with 4 direct pourings of multiple thread fin on the inwall of cast iron finned tube 1, flue gas is stirred at the pipe inside spin, prolong smoke is conducted heat the time, at the outside of cast iron finned tube 1 weldering system hoop fin 3, heat exchange area is big, offer semicircle seal groove 2 respectively at the two ends of cast

iron finned tube

1,5, be used for the filled stone cotton cord, to prevent the mutual leakage between flue gas and air, offer flue gas communication port 7 in the middle of it, end at cast iron finned tube 1 installs end face sealing ring 6 additional, form by 336 cast iron finned tubes, following two

casings

8,13, on, following two

casings

8,13 inner bottom parts fixedly mount a tube sheet respectively, 168 cast iron finned tubes are arranged in the upper box body 8,168 cast iron finned tubes are arranged in the lower part box 13, its end that installs end face sealing ring 6 additional is for circular, be inserted in, following two casings 8, in the tube sheet in 13, fill semicircle seal groove 5 with asbestos pad and asbestos cord then, the other end of cast iron finned tube is strained and fixed with bolt, and expansion loop 16 is installed in, following two

casings

8,13 top; Thereby on upper box body 8, form smoke inlet 9, on lower part box 13, form exhanst gas outlet 12, an end is offered cool air inlet 11 on lower part box 13, other end fixed installation air channel elbow 15, fixed installation deflector 14 on the upper box body 8 in air channel elbow 15, cold air is entered from an end of lower part box 13, come out to enter in the air channel elbow 15 from its other end, under the effect of deflector 14, hot-air divides two-way to enter upper box body 8 one ends, the other end of upper box body 8 is offered hot air outlet 10, and whole highly effective air preheater installs.

A kind of efficient cast iron screw thread fin air preheater described in the utility model, be as heat transfer element by the finned tube of being with the multiple thread fin, high-temperature flue gas circulates at cast iron finned tube inner chamber, the outside circulation of cold air hoop fin outside pipe, by heat exchange, make the cold air heating, thereby improved heat transfer coefficient and efficient.

A kind of efficient cast iron screw thread fin air preheater described in the utility model can be used in Industrial Boiler and small hydropower station boiler, also can be used on industrial furnace.

Claims

1, a kind of efficient cast iron screw thread fin air preheater, the casing that it comprises smoke inlet, exhanst gas outlet, cool air inlet, hot air outlet, is made up of cast iron finned tube (1), casing can be by a main box, also can be in series by two and plural casing, cast iron finned tube (1) two ends are established semicircle seal groove (2), (5) respectively, flue gas communication port (7) is established in the centre, it is characterized in that establishing in the described cast iron finned tube (1) multiple thread fin (4).

2, by the described a kind of efficient cast iron screw thread fin air preheater of claim 1, it is characterized in that described cast iron finned tube (1) peripheral hardware hoop fin (3).

3, by claim 1 or 2 described a kind of efficient cast iron screw thread fin air preheaters, it is characterized in that an end of described cast iron finned tube (1) is established end face sealing ring (6).

4, by claim 1 or 2 described a kind of efficient cast iron screw thread fin air preheaters, it is characterized in that described cast iron finned tube (1) one end is square, an end is circular.