CN203757757U

CN203757757U - Combined air preheater

Info

Publication number: CN203757757U
Application number: CN201420042910.1U
Authority: CN
Inventors: 蒙爱红; 曹剑; 吴洪肖
Original assignee: BEIJING TIANSU SUNLIGHT LOW CARBON TECHNOLOGY Co Ltd
Current assignee: BEIJING TIANSU SUNLIGHT LOW CARBON TECHNOLOGY Co Ltd
Priority date: 2014-01-23
Filing date: 2014-01-23
Publication date: 2014-08-06
Anticipated expiration: 2024-01-23

Abstract

A combined air preheater comprises a flue, a tubular heat exchanger and a hot tube heat exchanger. A hot end of the hot tube heat exchanger is arranged in the flue, the tubular heat exchanger is arranged in the flue on the lower portion of the hot end of the hot tube heat exchanger and connected with a cold end of the hot tube heat exchanger outside the flue through a reversing chamber, the tubular heat exchanger comprises an in-line tube bundle, tube plates and heat exchange tubes are arranged into the in-line tube bundle, the ratio of the horizontal pitches S1 of the tube bundles to the outer diameters of the heat exchange tubes ranges from 1.75 to 3.00, and the ratio of the horizontal pitches S2 of the tube bundles to the outer diameters of the heat exchange tubes ranges from 1.50 to 2.50. Compared with the prior art, the combined air preheater sufficiently combines the advantages of corrosion resistance of the hot tube heat exchanger and easiness in replacement of the tubular heat exchanger, and is quite suitable for boilers burning high-moisture coal, biomass, garbage and the like.

Description

A kind of Combined air preheater

Technical field

The utility model relates to a kind of air preheater, relates in particular to a kind of air preheater for boiler that pipe heat exchanger and heat exchange of heat pipe are combined, and belongs to heat energy utilization field.

Background technology

At present, no matter station boiler or Industrial Boiler, considers from smooth combustion and Energy Angle, the air preheater heat-transferring assembly that has been absolutely necessary.But in field of boilers such as combustion brown coal, living beings, solid waste, because the temperature of air preheater work is low, heat exchanger tube wall temperature for a long time under acid dew-point temperature, thereby easily produces dewing corrosion.In addition, often have flying dust to be deposited in Tube Sheet of Heat Exchanger, after being stacked into a certain degree, dust stratification will stop up exhaust gases passes.The method that solves air preheater Corrosion blockage has the heat-pipe air preheater of employing, hot blast recirculation, steam air heater etc., but has pluses and minuses separately.For example, although heat-pipe air preheater good corrosion resistance, the fin of fume side is than comparatively dense, at easily stifled ash of low-temperature end.Hot blast method for recycling, need to increase equipment, and the power consumption increasing consumption on recirculation blower.Steam air heater not only needs increase equipment, and operation time need to be supplied steam.For solving Ash Blocking in Air Preheater and etching problem, Chinese patent CN94212891.5 has proposed the low temperature resistant corrosion air preheater of a kind of reverse heat-conducting, be equivalent to the method by extending air preheater heat pipe, maintain the cold junction temperature of preheater tube, tube wall temperature can be improved to 10～40 DEG C, thereby reduce cold end corrosion.Chinese patent CN87216985U has announced a kind of augmentation of heat transfer regenerative air heater, all adopts extended surface inside and outside pipe, and flue gas is longitudinal flow in pipe, withstand corrosion and anti-dust stratification, but inside and outside pipe, have fin, manufacture complicated.Chinese patent CN201897234U has announced a kind of air preheater for boiler, and by two tubular heat exchanger combinations, air is walked in pipe, and flue gas is walked outside pipe, plates enamel on tube wall, can reduce corrosion tendency, but this air preheater band sagging plate is installed difficulty.This air preheater is still flue gas and air direct heat transfer in essence, and the wall temperature of heat exchanger tube also can be lower, and effect is still undesirable.

Summary of the invention

The deficiency and the defect that exist for prior art, the purpose of this utility model is to provide a kind of corrosion-resistant and difficult stifled grey Combined air preheater.

The utility model is achieved through the following technical solutions:

A kind of Combined air preheater, it comprises flue, pipe heat exchanger and heat exchange of heat pipe, the hot junction of described heat exchange of heat pipe is arranged in flue, in the flue of bottom, hot junction, arranges pipe heat exchanger, and pipe heat exchanger is connected with the heat exchange of heat pipe cold junction outside flue by reversal chamber.The suitable tubulation Shu Zucheng that described pipe heat exchanger is lined up by tube sheet and heat exchanger tube, the transverse pitch S1 of suitable tubulation bundle that heat exchanger tube is lined up and the ratio of the external diameter of heat exchanger tube are 1.75～3.00, longitudinal pitch S2 is 1.50～2.50 with the ratio of the external diameter of heat exchanger tube.

The utility model compared with prior art, has the following advantages and high-lighting effect: 1. heat exchange of heat pipe and pipe heat exchanger combination, can give full play to advantage separately.2. heat exchange of heat pipe is arranged in the top of pipe heat exchanger, and flue-gas temperature is high, and loose, the difficult bonding of flying dust quality, can avoid the flying dust in flue gas to be bonded on the fin in heat pipe hot junction, thereby stop up smoke gas flow circulation passage.3. be arranged in the pipe heat exchanger of flue gas low-temperature side, in-line arrangement, tube coupling, apart from large, is not easy stifled ash, even if corrosion and stifled ash are also convenient to change.

Brief description of the drawings

Fig. 1 is the schematic diagram of the related a kind of Combined air preheater of the utility model;

Fig. 2 is that in Combined air preheater, pipe heat exchanger part axle measures intention.

In figure: the outlet of 1-cold flue gas; 2-cold air inlet; 3-pipe heat exchanger; 4-heat exchange of heat pipe; 5-flue; The hot smoke inlet of 6-; 7-hot-blast outlet; 8-centre air vent; 9-tube sheet; 10-heat exchanger tube; 11-reversal chamber; 41-hot junction; 42-cold junction.

Detailed description of the invention

Describe concrete structure of the present utility model, operation principle and embodiment in detail below in conjunction with accompanying drawing:

Fig. 1 is the schematic diagram of the related a kind of Combined air preheater of the utility model, and it comprises flue 5, pipe heat exchanger 3 and heat exchange of heat pipe 4.The hot junction 41 of heat exchange of heat pipe 4 is arranged in flue 5, the interior layout pipe heat exchanger 3 of flue 5 in 41 bottoms, hot junction, and pipe heat exchanger 3 is connected with heat exchange of heat pipe 4 cold junctions 42 outside flue 5 by reversal chamber 11.

Fig. 2 is that in Combined air preheater, pipe heat exchanger part axle measures intention, the suitable tubulation Shu Zucheng that pipe heat exchanger 3 is lined up by tube sheet 9 and heat exchanger tube 10, the transverse pitch S1 of the suitable tubulation bundle that heat exchanger tube 10 is lined up is 2.0 with the ratio of the external diameter of heat exchanger tube 10, and longitudinal pitch S2 is 1.8 with the ratio of the external diameter of heat exchanger tube 10.

Combined air preheater is arranged in the afterbody of boiler, the back-end ductwork of flue 5 and boiler is connected, the flue gas of boiler is introduced into the hot junction 41 of heat exchange of heat pipe 4 from hot smoke inlet 6, after flue gas and heat pipe heat exchanging, temperature reduction enters pipe heat exchanger 3 again, the tube bank of flue gas transversal flow heat exchanger tube 10, with the cold air heat exchange in tube bank.Cold air enters pipe heat exchanger 3 from cold air inlet 2, go out centre air vent 8 through heat-exchange temperature up-flow, enter the cold junction 42 of heat exchange of heat pipe through reversal chamber 11, in cold junction 42, heat exchange of heat pipe is carried the thermal release of coming to air from hot junction 41, air themperature further raises, and final high temperature air is confessed from hot-blast outlet 7.The hot blast that this combination air preheater produces can be used as the use of a wind, the Secondary Air etc. of boiler.

This combination, fully combines the corrosion-resistant and pipe heat exchanger of heat exchange of heat pipe and is easy to the advantages such as replacing, is very suitable for the application of the boilers such as hydrogenous coal, living beings, rubbish.

Claims

1. a Combined air preheater, comprise flue (5), pipe heat exchanger (3) and heat exchange of heat pipe (4), it is characterized in that: the hot junction (41) of heat exchange of heat pipe (4) is arranged in flue (5), in the flue (5) of bottom, hot junction (41), arrange pipe heat exchanger (3), pipe heat exchanger (3) is connected by reversal chamber (11) heat exchange of heat pipe (4) cold junction (42) outer with flue (5).

2. a kind of Combined air preheater according to claim 1, it is characterized in that: the suitable tubulation Shu Zucheng that described pipe heat exchanger (3) is lined up by tube sheet (9) and heat exchanger tube (10), the ratio of the external diameter of the transverse pitch S1 of the suitable tubulation bundle that heat exchanger tube (10) is lined up and heat exchanger tube (10) is 1.75～3.00, and the ratio of the external diameter of longitudinal pitch S2 and heat exchanger tube (10) is 1.50～2.50.