ASME Economiser In Boiler Oil / Hot Water Heat Exchanger Industrial Using

ASME Economiser In Boiler Oil / Hot Water Heat Exchanger Industrial Using

H-type finned-tube economizer is a high-efficiency heat exchange economizer assembled by H-type finned tube (also known as H-type finned tube, finned tube, butterfly tube).

1, the form of structure: the basic form is "H" and double "H" type, arranged in line.

2, performance characteristics

1) Replacing bare tube economizer with H-type finned tube economizer can increase heat exchange area and reduce the number of tubes arranged, thus increasing the flue gas flow cross section, reducing the flue gas velocity and reducing wear. Since the wear rate of the pipe is proportional to the 3.33 power of the flue gas flow rate, if the flue gas velocity is reduced from 9 m/s to 7 m/s, the wear rate will be reduced to 43% of the original one. At the same time, the experiment shows that the finned tube itself has the function of centralizing fly ash into the middle of the tube row, so the finned tube economizer has the function of reducing wear and tear in structure.

2) H-type finned tube can be made into double-tube "double-H" type finned tube. Its structure is rigid and can be used in the case of long tube row.

3) H-type finned tube economizer is arranged in sequence. H-type fins divide the space into several small areas, which can equalize the flow of airflow and greatly reduce wear and tear.

4) H type fins have the best soot blowing effect due to the formation of straight passages on both sides.

5) the space is compact, the overall weight is greatly reduced, and the cost is reduced.

6) Energy saving and less power consumption: The economizer for generating units can reduce at least two-thirds of the heat loss of exhaust gas from generators, and consume only 2-4 kW of power per ton of steam.

7) Simple operation and maintenance; Labor saving: The economizer is assembled and manufactured as a whole, with fewer moving parts, simple structure and easy installation. The automation level is high, the operation and maintenance are simple, and the operators can be reduced.

Material Structure of Boiler H Finned Tube Economizer

Consists of a serious of H fin tubes, the headers of inlet and outlet, bend, frame and other auxiliaries.

Characteristics of Boiler H Finned Tube Economizer

1). Add the heat exchange area and reduce the number of tubes, also increase the fume flow section area to reduce the fume speed and abrasion.
2). H type fin tube can be made to double H type fin tube, high rigidness to fit long tube row.
3). H type fin economizer arranged in line to make the space into many small zones, averaged air flow to reduce the abrasion.
4). With straight channel to gain the best ash-blowing effect.
5). The compact structure to reduce the weight and reduce the manufacturing cost.

Specifications

Advantages

1. Excellent wear resistance

The wear is mainly due to the impact and cutting effect of gray particles on the pipe. The wear is the most severe around the pipe at a level of 30 degrees. When S1/d=S2/d=2, the wear amount here is 3 times of the average value.

Due to the change of air flow direction, the second row has the most severe wear. When S1/d=S2/d=2, the second row is twice as much as the first row wear, and the subsequent row wear is generally 30% to 40% higher than the first row.

The arrangement of the first row is the same as the arrangement of the first row in the sequence.Under the same conditions, the maximum wear of the longitudinal tube bundle is 3-4 times less than that of the staggered tube bundle.

The abrasion speed of the pipe is directly proportional to the non-uniformity coefficient of the flue gas velocity KV3.33, and is directly proportional to the non-uniformity coefficient of the fly ash concentration Ku.

The h-shape finned tube economizer is arranged in sequence. The h-shaped fin divides the space into several small areas and has a uniform flow effect on the airflow. Compared with the optical tube economizer, spiral fin economizer and longitudinal fin economizer with staggered arrangement, the wear life is 3-4 times higher under other conditions.

Flue gas side damper protects the bend part.

2. Reduced dust accumulation

Ash formation occurs on the pipe's back and windward sides.It is easy to scour the pipe by disarrangement, and less dust accumulates on the back.As for the pipe arrangement in sequence, due to the fact that the air flow is not easy to flush the back of the pipe, there is more ash accumulation in the pipe arrangement in sequence than in the wrong column.

The h-type fin is welded on both sides of the pipe, which does not accumulate ash, while the air flow flows straight, the air flow direction does not change, and the fin does not accumulate ash.

A gap of 4-10 is left in the middle of the h-type fin, which can guide the air flow to sweep the pipe fin to accumulate dust.

As the spiral Angle of the fin guides the flow direction, the ash accumulation of the fin tube is more serious, and the economizer which does not form loose ash cannot be used.Field operation shows that the h-shaped fin tube does not accumulate ash, while the spiral fin is seriously.

The longitudinal fin tube is formed by the flow of air along the fin as the fin is welded on the surface and back of the accumulated ash.Some areas are prone to dust accumulation.

The h-shaped fin, which forms a straight channel on both sides, has the best blowing effect.

3. Compact space and low cost

The pipe set is much compact and reduces the height of tail smoke well.

The total weight is greatly reduced and the load of the suspension system is reduced.

Reduce cost of economizer and integral boiler.

4. Reduce smoke lateral resistance

Reduce the operating and investment cost of induced fan.

5. Reduce welding joint and improve reliability.

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