CN202018215U

CN202018215U - Double-pipe air heat exchanger

Info

Publication number: CN202018215U
Application number: CN2011200505582U
Authority: CN
Inventors: 姜乃斌; 段俊峰; 董民生
Original assignee: Xi'an Huajiang Metallurgical & Chemical Equipment Co ltd
Current assignee: Xian Huajiang Environmental Technologies Co Ltd
Priority date: 2011-02-28
Filing date: 2011-02-28
Publication date: 2011-10-26
Anticipated expiration: 2021-02-28

Abstract

The utility model discloses a double-pipe air heat exchanger, wherein, a cold air inlet pipe communicated with the inner part of an upper cylinder body is arranged at the upper end of the upper cylinder body; a lower cylinder body provided with a hot air outlet pipe on the right side is arranged at the lower end of the upper cylinder body; inner pipes and outer pipes are arranged on a bottom plate of the upper cylinder body, the inner pipes are communicated with the inner part of the upper cylinder body, the inner pipes are sheathed with the outer pipes, and the bottom ends of the outer pipes are sealed up; and the inner pipes are communicated with the inner parts of the outer pipes. A heat transfer element of the double-pipe air heat exchanger adopts a heat transfer tube which is arranged in a nesting manner, air flows downwards after entering the inner pipes and then upwards flows out of the inner pipes through circular gaps formed between the inner pipes and the outer pipes; and the heat quantity is transmitted to air in the circular gaps formed between the inner pipes and the outer pipes in a convection manner, is transmitted to inner pipe walls in a radiation manner, and then is transmitted to the air in the circular gaps formed between the inner pipes and the outer pipes through the inner pipe walls, so that the heating efficiency of furnaces and kilns can be improved very effectively. The double-pipe air heat exchanger has the advantages of reasonable design, simple structure, high heat exchanging efficiency and the like, and can be used as a heat exchanger for gases and liquids.

Description

The bushing type air heat exchanger

Technical field

The utility model belongs to industrial furnace flue gas waste heat recovery treating apparatus technical field, is specifically related to a kind of bushing type air heat exchanger.

Background technology

In the industries such as the boiler in thermal power plant, Industrial Boiler, petrochemical equipment, in order to improve device heat efficiency, make full use of smoke discharging residual heat, generally all adopt flue gas-air heat exchanger, this class heat exchanger has following several form usually:

Plate type heat exchanger conducts heat by plate, is used for small-sized industrial boiler, because its complex structure, heat transfer efficiency is low, and it is big to leak out, and now is eliminated gradually.

Rotary type heat exchanger, it is a disk of filling the waveform heat transfer element, is rotated with about 1 rev/min low speed.Half of disk is by hot flue gas heating heat transfer element, and second half is by heated air, along with the continuous rotation of disk, flue gas is cooled off by heat transfer element, and air is heated by heat transfer element, and the shortcoming of this heat exchanger is that air leak rate of air curtain is big, directly influence boiler efficiency, safety in operation is poor.

Heat-pipe heat exchanger, it utilizes, and adopting heat pipes for heat transfer is fast, heat-carrying capacity is big, Heat stability is good, with in tube sheet heat pipe is divided into two parts up and down, upper box ventilating air, lower box circulate flue gas, air and flue gas reverse flow.When hot flue gas is flowed through lower box heat is discharged to the heat pipe bringing-up section, bringing-up section is passed to the heat pipe cooling section with heat with the thermal conductance form, cooling section discharges heat the air to the upper box of flowing through again, this heat exchanger is compared preceding two kinds of heat exchangers and is had little, the easy arrangement of volume, no-rotary part has little, the advantage of simple structure of maintenance capacity, but heat-pipe heat exchanger is to adopt the single tube structure, and hot flow of flue gas is fast, and heat transfer efficiency is still not high.

Summary of the invention

Technical problem to be solved in the utility model is to overcome the shortcoming and defect of existing heat exchanger, and a kind of reasonable in design, simple in structure, heat transfer coefficient is high, heat exchange efficiency is high, product cost is low bushing type air heat exchanger is provided.

Solving the problems of the technologies described above the technical scheme that is adopted is: the upper end of upper shell be provided with upper shell in the cold wind inlet pipe, the lower end that link the right side is set the lower shell that hot blast goes out pipe is installed, the base plate of upper shell be provided with upper shell in the interior pipe that links and be sleeved in the outer tube of the outer and bottom sealing of pipe, link in interior pipe and the outer tube.

The outer tube wall of pipe is provided with helical form around on inner pipe eddy flow projection in of the present utility model.

Be processed with spray orifice on the tube wall of pipe in of the present utility model.

The utility model adopts at the higher flue gas of dust-laden (or particle), air or fuel gas carry out exchange heat, heat transfer element is the heat-transfer pipe of nested setting, flow downward behind the pipe in air enters and upwards flow out by the radial clearance between the inner and outer pipes again, air in the gap in heat passes to by convection current between pipe and the outer pipe ring, and by the hot inner tubal wall of giving of radiation conduction, conduct to the air in the radial clearance between interior pipe and the outer tube by inner tubal wall again, very effective to the thermal efficiency that improves stove, and, pipe in of the present utility model, the upper end of outer tube is fixed on the base plate of upper shell, the lower end is that freedom can expand, make interior pipe, expansion between the outer tube is independent of each other, in use do not produce thermal stress, heat transfer element is not easy to damage.The utlity model has reasonable in design, simple in structure, heat exchange efficiency advantages of higher, can be used as the heat exchanger of gas and liquid.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment 1.

Fig. 2 is the local enlarged diagram of A among Fig. 1.

Fig. 3 is the structural representation of interior pipe 5 among Fig. 1.

Fig. 4 is the local enlarged diagram of B among Fig. 2.

The specific embodiment

Below in conjunction with accompanying drawing and each embodiment the utility model is further described, but the utility model is not limited to these embodiment.

Embodiment 1

In Fig. 1, the bushing type air heat exchanger of present embodiment goes out pipe 4, interior pipe 5, outer tube 6 by upper shell 1, cold wind inlet pipe 2, lower shell 3, hot blast and connects and constitute.

In upper shell 1 bottom with the screw threads for fastening connector lower shell 3 that has been fixedly connected, do not communicate with one another between upper shell 1 and the lower shell 3, the top welding of upper shell 1 is connected with cold wind inlet pipe 2, link in cold wind inlet pipe 2 and the upper shell 1, air enters in the upper shell 1 from cold wind inlet pipe 2, welding is connected with the interior pipe 5 of downward extension on the base plate of upper shell 1, interior pipe 5 uniform being arranged on upper shell 1 base plate, in link pipe 5 and flow downward in air can enter from upper shell 1 in pipe 5 and the upper shell 1 along interior pipe 5.Lower shell 3 right sides that are positioned at upper shell 1 below have hot blast to go out pipe 4 by thread connection, hot blast goes out in pipe 4 and the lower shell 3 to link, welding is connected with outer tube 6 on lower shell 3 base plates, the bottom sealing of outer tube 6, interior pipe 5 is sleeved in the outer tube 6, the center line of interior pipe 5 and the central lines of outer tube 6, the interior pipe 5 that stretches out from upper shell 1 bottom passes lower shell 3 and stretches into the outer tube 6, link in the bottom of interior pipe 5 and the outer tube 6, outer tube 6 extends downwards from lower shell 3 bottoms, can enter the outer tube 6 from interior pipe 5 during air flows downward.Outer tube 6 is arranged in the high-temperature flue gas environment, and outer tube 6 can obtain heat from high-temperature flue gas, and outer tube 6 tube wall temperatures are improved.After air in the inflow outer tube 6 enters outer tube 6 from interior pipe 5 lower ends, travel up in the lower shell 3 along the radial clearance between interior pipe 5 and the outer tube 6, air simultaneously carries out exchange heat with the tube wall of outer tube 6 in process of flowing, can be with air preheat to higher temperature, the temperature of outer tube 6 is reduced, prolonged the service life of air heat exchanger.From outer tube 6 upwards flow air after exchange heat, go out pipe 4 and flow out from the hot blast on lower shell 3 right sides.

As Fig. 2, Fig. 3, shown in Figure 4, on the outer tube wall of the top of interior pipe 5 welding be connected with a pair of manage in radially protruding from 5 outer tube walls on reference column 5-1, welding is connected with a pair of following reference column 5-2 that radially protrudes from interior pipe 5 outer tube walls on the outer tube wall of bottom, has minim gap between the free end of last reference column 5-1 and following reference column 5-2 and outer tube 6 inwalls, the dead in line of pipe 5 and outer tube 6 in last reference column 5-1 and following reference column 5-2 are used to guarantee, the quantity of reference column can differently according to the length of interior pipe 5 and outer tube 6 increase or reduce, be processed with helical form on interior pipe 5 outer tube walls and be looped around the interior eddy flow projection a that manages on 5, eddy flow projection a on interior pipe 5 outer tube walls, can prolong the preheating of air passage, increase the turbulence level of air, can improve heat exchange efficiency effectively.Be processed with spray orifice b on the tube wall of interior pipe 5 middle and lower parts, spray orifice b is uniform to be arranged on interior pipe 5 tube walls, air part when flowing downward in entering in the pipe 5 sprays at a high speed the outer tube 6 from spray orifice b, jet airstream vertically sprays to outer tube 6 inner surfaces, the exchange hot side impacts, make wake boundary destroyed, can strengthen heat convection efficient.

Claims

1. bushing type air heat exchanger, it is characterized in that: the upper end of upper shell (1) be provided with upper shell (1) in the cold wind inlet pipe (2), the lower end that link the right side is set the lower shell (3) that hot blast goes out pipe (4) is installed, the base plate of upper shell (1) be provided with upper shell (1) in the interior pipe (5) that links and the outer tube (6) that is sleeved on the outer and bottom sealing of interior pipe (5), link in interior pipe (5) and the outer tube (6).

2. according to the described bushing type air heat exchanger of claim 1, it is characterized in that: the outer tube wall of pipe (5) is provided with helical form and is looped around eddy flow projection (a) on the interior pipe (5) in said.

3. according to the described bushing type air heat exchanger of claim 1, it is characterized in that: be processed with spray orifice (b) on the tube wall of pipe (5) in said.