CN212456952U - Fluoroplastic steel air preheater - Google Patents

Abstract

The utility model discloses a fluoroplastic steel air preheater, which comprises a plurality of fluoroplastic steel pipes (1) arranged in parallel at intervals and two pipe plates (2) respectively arranged at the two ends of the fluoroplastic steel pipes (1), wherein the fluoroplastic steel pipes (1) are in a structure that fluoroplastic films cover stainless steel pipes, and the thickness of the fluoroplastic film on the fluoroplastic steel pipe (1) at the flue gas inlet side of the air preheater is greater than that of the fluoroplastic film on the flue gas outlet side of the fluoroplastic steel pipe (1); and an annular groove is formed in the hole wall, matched with the fluoroplastic steel pipe (1), of the pipe plate (2), and a fluororubber O-shaped ring (3) is arranged in the annular groove. The utility model has the advantages of the wearing and tearing of each fluoroplastic steel pipe are more even in the use, need not frequently to change fluoroplastic steel pipe, structural strength height, long service life of flue gas import department.

Description

Fluoroplastic steel air preheater

Technical Field

The utility model relates to an air heater, especially a fluoroplastic steel air heater.

Background

At present, in the operation of boilers in China, the direct cost of equipment replacement and shutdown ash removal caused by low-temperature corrosion and ash blockage accounts for about 4-5% of the operation cost every year, and if the direct cost is added, the loss of shutdown accidents caused by the equipment replacement and shutdown is more huge. At present, many boiler operation enterprises frequently stop the boiler and maintain in order to avoid low-temperature corrosion and ash blockage, and unfortunately improve the exhaust gas temperature of the boiler. According to the measurement and calculation, the heat efficiency of the boiler is reduced by 0.5-0.7% when the exhaust gas temperature of the boiler is increased by 10 ℃, thereby causing a great amount of energy loss. In order to solve the problem, an air preheater is produced, which is an important device for saving energy and reducing consumption of a boiler, and achieves the purposes of reducing the temperature of discharged flue gas and increasing the temperature of air by carrying out heat exchange on high-temperature flue gas in the boiler and air used for combustion. The air preheater generally includes two types, namely a tubular air preheater and a regenerative air preheater, wherein the tubular air preheater includes a tubular tube and a heat tube, and the regenerative air preheater includes two basic design forms, namely a heating surface rotary type and a hood rotary type, and further includes a radiation type, a ceramic tube type, a jet flow type and the like. The dew point corrosion is reduced, the heat efficiency is improved, various air preheaters are improved in many ways, even the air preheaters are compounded in different categories, but the most common air preheater is still a tubular air preheater at present.

At present, the traditional tube array type air preheater mainly adopts carbon steel tubes as heat transfer components, the carbon steel tubes are arranged in a staggered or in-line mode, and two ends of the carbon steel tubes are welded on a tube plate. In the operation stage of the air preheater, the problems of low-temperature corrosion, ash blockage, abrasion and the like often occur, so the service life of a carbon steel pipe adopted by the traditional air preheater is very short and generally can not exceed three years. Aiming at the current situation, the fluoroplastic steel heat exchange tube can be better applied to the air preheater due to the unique characteristics of the fluoroplastic steel heat exchange tube. The fluoroplastic steel air preheater has the characteristics of smooth surface, corrosion resistance, wear resistance, long service life, strong rigidity and the like, the heat conductivity coefficient is between that of fluoroplastic and stainless steel, and compared with the traditional air preheater, the fluoroplastic steel air preheater has stronger competitiveness and has wider prospects under the background of strongly advocating environmental protection, energy conservation and emission reduction.

However, the existing fluoroplastic steel air preheater still has various defects, as the flue gas temperature and the flow rate at the flue gas inlet of the air preheater are both high, the abrasiveness to fluoroplastic steel pipes is also high, all fluoroplastic steel pipes of the existing fluoroplastic steel air preheater adopt uniform specifications, the fluoroplastic steel pipes at the flue gas inlet are frequently required to be replaced due to excessive wear in the using process, and the replacement means that the furnace is required to be shut down, so that the great economic loss is caused; in addition, the existing fluorine plastic steel pipe and the pipe plates at two ends are welded and sleeved, so that stress deformation is easily caused to the pipe plates, the structural strength of the air preheater is reduced, and the service life is not ideal. Therefore, the existing fluorine plastic steel air preheater has the problems of poor abrasion resistance, frequent replacement of the fluorine plastic steel pipe at the smoke inlet, low structural strength and unsatisfactory service life.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a fluoroplastic steel air heater. The device has the advantages that the abrasion of each fluoroplastic steel pipe is uniform in the using process, the fluoroplastic steel pipe at the smoke inlet does not need to be frequently replaced, the structural strength is high, and the service life is long.

The technical scheme of the utility model: fluoroplastic steel air preheater includes fluoroplastic steel pipes and two tube sheets that set up respectively at fluoroplastic steel pipe both ends that a plurality of parallel intervals were arranged, fluoroplastic steel pipe be the structure of the nonrust steel pipe of fluoroplastic membrane cladding, the fluoroplastic membrane thickness that is located air preheater flue gas inlet side fluoroplastic steel pipe is greater than the fluoroplastic membrane thickness of flue gas outlet side fluoroplastic steel pipe.

In the fluoroplastic steel air preheater, the pipe plate is provided with an annular groove on the hole wall matched with the fluoroplastic steel pipe, and the annular groove is internally provided with a fluororubber O-shaped ring.

In the fluoroplastic steel air preheater, a middle partition plate is arranged between the two tube plates, and a fluoroplastic guide sleeve is arranged between the middle partition plate and the fluoroplastic steel tube.

In the fluoroplastic steel air preheater, the plurality of fluoroplastic steel pipes arranged in parallel at intervals are arranged in a rectangular array structure in a determinant manner.

In the fluoroplastic steel air preheater, the thickness of the fluoroplastic film of the fluoroplastic steel pipe positioned at the flue gas inlet side of the air preheater is 0.5 mm.

In the fluoroplastic steel air preheater, the thickness of the fluoroplastic film on the fluoroplastic steel pipe on the flue gas outlet side of the air preheater is 0.3 mm.

In the fluoroplastic steel air preheater, the number of rows of fluoroplastic steel pipes with large fluoroplastic film thicknesses is 3.

In the fluoroplastic steel air preheater, the number of rows of fluoroplastic steel pipes with small fluoroplastic film thickness is 16.

In the fluoroplastic steel air preheater, a reinforcing rod is arranged between the two tube plates.

In the fluoroplastic steel air preheater, the middle partition plate is located in the middle between the two tube plates.

Compared with the prior art, the utility model discloses the fluoroplastic membrane that will be located the fluoroplastic film of air heater flue gas inlet side fluoroplastic steel pipe and the fluoroplastic film of flue gas outlet side fluoroplastic steel pipe sets to different thickness, specifically the fluoroplastic film of flue gas inlet side fluoroplastic steel pipe is thicker, has solved the flue gas temperature of air heater flue gas inlet side well and the all higher and serious problem of fluoroplastic steel pipe wearing and tearing that lead to of velocity of flow, the utility model discloses the wearing and tearing of each fluoroplastic steel pipe are comparatively even, can reach whole change behind all fluoroplastic steel pipe wearing and tearing to the certain degree, need not frequently to change the fluoroplastic steel pipe of flue gas inlet department, also need not to stop the stove and shut down many times, have fine economy and social.

Furthermore, a ring groove is arranged on the hole wall matched with the fluoroplastic steel pipe on the pipe plate, a fluororubber O-shaped ring is arranged in the ring groove, the existing welding and sleeve pipe mode is replaced by the mode of grooving the pipe plate and adding the O-shaped ring, the stress deformation caused by welding the pipe plate is avoided, and the service life of the utility model can be prolonged by the flexible connection mode; furthermore, a middle partition plate is arranged between the two tube plates, a fluoroplastic guide sleeve is arranged between the middle partition plate and the fluoroplastic steel tube, and the middle partition plate provides auxiliary support for the fluoroplastic steel tube, so that the stress condition of the two tube plates is improved, and the structural strength of the utility model is improved; in addition, be equipped with the stiffener between two tube sheets, further improved the utility model discloses a structural strength makes the utility model discloses there is longer life.

To sum up, the utility model has the advantages of each fluoroplastic steel pipe's wearing and tearing are more even in the use, need not frequently to change fluoroplastic steel pipe, the structural strength height of flue gas import department, long service life.

Drawings

Fig. 1 is a top view of the present invention;

fig. 2 is a side view of the present invention;

FIG. 3 is a schematic view of the connection structure of the fluoroplastic steel tube and the tube sheet of the present invention;

fig. 4 is a partial enlarged view of fig. 3 at a.

Reference numerals: the composite pipe comprises a 1-fluoroplastic steel pipe, a 2-pipe plate, a 3-fluororubber O-shaped ring, a 4-middle partition plate, a 5-fluoroplastic guide sleeve and a 6-reinforcing rod.

Detailed Description

The following description is made with reference to the accompanying drawings and examples, but not to be construed as limiting the invention.

Example (b): fluoroplastic steel air preheater, the structure is as shown in fig. 1 to 4, fluoroplastic steel pipe 1 and two pipe sheet 2 that set up respectively at fluoroplastic steel pipe 1 both ends including a plurality of parallel interval arrangements, fluoroplastic steel pipe 1 be the structure of fluoroplastic film cladding stainless steel pipe, the fluoroplastic film thickness that is located air preheater flue gas inlet side fluoroplastic steel pipe 1 is greater than the fluoroplastic film thickness of flue gas outlet side fluoroplastic steel pipe 1, each fluoroplastic steel pipe 1 can wear and tear comparatively evenly, can reach the whole change of all fluoroplastic steel pipe 1 wearing and tearing after the certain degree, need not frequently to change fluoroplastic steel pipe 1 of flue gas inlet department.

The hole wall matched with the fluoroplastic steel pipe 1 on the pipe plate 2 is provided with an annular groove, a fluororubber O-shaped ring 3 is arranged in the annular groove, the form of grooving the pipe plate 2 and adding the fluororubber O-shaped ring 3 is adopted, the flexibility is good, the existing welding and sleeve pipe form is replaced, and the stress deformation caused by welding on the pipe plate 2 is avoided.

Because the utility model discloses a tube sheet 2 adopts flexonics with fluoroplastic steel pipe 1, and rigidity is relatively poor, needs reasonable in design's bearing structure to improve rigidity, specifically, is equipped with median septum 4 between two tube sheets 2, is equipped with fluoroplastics uide bushing 5 between median septum 4 and the fluoroplastic steel pipe 1, and median septum 4 provides the auxiliary stay for fluoroplastic steel pipe 1, has improved the atress condition of two tube sheets 2, has improved the utility model discloses a structural strength.

Be equipped with stiffener 6 between two tube sheets 2, further improved the utility model discloses a structural strength.

Preferably, the fluoroplastic steel pipes 1 which are arranged in parallel at intervals are arranged in a rectangular array structure in a row-by-row manner.

Preferably, the fluoroplastic film thickness of the fluoroplastic steel pipe 1 positioned on the smoke inlet side of the air preheater is 0.5 mm.

Preferably, the fluoroplastic film thickness of the fluoroplastic steel pipe 1 positioned at the flue gas outlet side of the air preheater is 0.3 mm.

Since the impact abrasion of the smoke on the fluoroplastic steel pipe 1 mainly occurs in the first three rows of the pipe row, preferably, the number of the rows of the fluoroplastic steel pipe 1 with the large fluoroplastic film thickness is 3.

Preferably, the number of rows of the fluoroplastic pipes 1 with the small fluoroplastic film thickness is 16.

Preferably, the middle partition plate 4 is located at an intermediate position between the two tube plates 2.

The utility model discloses a theory of operation: as shown in fig. 1 and 2, high-temperature flue gas enters from a flue gas inlet a and is output from a flue gas outlet b, and meanwhile, air to be subjected to heat exchange is input from an air inlet c of the fluoroplastic steel pipe 1 and is output from an air outlet d, so that heat exchange with the high-temperature flue gas is realized.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Claims (10)

1. Fluoroplastic steel air preheater includes fluoroplastic steel pipe (1) and two tubesheets (2) that set up respectively at fluoroplastic steel pipe (1) both ends that a plurality of parallel intervals were arranged, fluoroplastic steel pipe (1) be the structure of fluoroplastic membrane cladding nonrust steel pipe, its characterized in that: the thickness of the fluoroplastic film of the fluoroplastic steel pipe (1) positioned at the flue gas inlet side of the air preheater is larger than that of the fluoroplastic film of the fluoroplastic steel pipe (1) positioned at the flue gas outlet side.

2. A fluoroplastic steel air preheater according to claim 1, wherein: and an annular groove is formed in the hole wall, matched with the fluoroplastic steel pipe (1), of the pipe plate (2), and a fluororubber O-shaped ring (3) is arranged in the annular groove.

3. A fluoroplastic steel air preheater according to claim 1 or claim 2, wherein: a middle partition plate (4) is arranged between the two tube plates (2), and a fluoroplastic guide sleeve (5) is arranged between the middle partition plate (4) and the fluoroplastic steel tube (1).

4. A fluoroplastic steel air preheater according to claim 3, wherein: the fluoroplastic steel pipes (1) arranged in parallel at intervals are arranged in a rectangular array structure in a row-by-row manner.

5. A fluoroplastic steel air preheater according to claim 4, wherein: the thickness of the fluoroplastic film of the fluoroplastic steel pipe (1) positioned at the smoke inlet side of the air preheater is 0.5 mm.

6. A fluoroplastic steel air preheater according to claim 4, wherein: the thickness of the fluoroplastic film on the fluoroplastic steel pipe (1) positioned on the flue gas outlet side of the air preheater is 0.3 mm.

7. A fluoroplastic steel air preheater according to claim 4, wherein: the number of rows of the fluoroplastic steel pipes (1) with large fluoroplastic film thickness is 3.

8. A fluoroplastic steel air preheater according to claim 4, wherein: the number of rows of the fluoroplastic steel pipes (1) with small fluoroplastic film thickness is 16.

9. A fluoroplastic steel air preheater according to claim 4, wherein: and a reinforcing rod (6) is arranged between the two tube plates (2).

10. A fluoroplastic steel air preheater according to claim 4, wherein: the middle clapboard (4) is positioned in the middle between the two tube plates (2).

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