CN2126405U

CN2126405U - External heating inversely flow-collecting radiation heat exchanger

Info

Publication number: CN2126405U
Application number: CN92212962U
Authority: CN
Inventors: 聂春分
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-05-28
Filing date: 1992-05-28
Publication date: 1992-12-30

Abstract

The utility model relates to an air-air heat exchanger, particularly an external heating inversely flow-collecting radiation heat exchanger, which is used for waste heat recovery of high temperature flue gas. The aim of the utility model is to solve the problems of the lower heat exchange efficiency, the poor flue sealing performance, and the lower service life of the prior radiation heat exchangers. The utility model is characterized in that the flue gas flows along the outer side of a heat exchange cylinder wall; the air flows into a heat exchanger body and flows out of the heat exchanger body from one end; the heat exchanger body is hung in a flue gas chamber; convection heat transfer can be intensified by an air side with jet flow, external spiral flow and end vortex flow. The end of the heat exchanger body adopts boiler cylinder head sample structure, and the important part of the utility model does not have fillet weld.

Description

External heating inversely flow-collecting radiation heat exchanger

Radiation recuperator in the flame furnace flue gas waste heat recovery that is used for temperature more than 1000 ℃, having plenty of flue gas passes through from heat exchanger inside, cause the fume side heat transfer coefficient low, has plenty of air from both sides or two turnover, cause the flue a large amount of cold air of suction and reduce the cigarette temperature, enlarge the cigarette amount, bring adverse effect for the waste heat recovery and the subsequent treatment of flue gas; The design of having plenty of thermal expansion compensator and high temperature position angle welding does not guarantee that heat exchanger is subjected to the uniformity of heat structure and in use causes weld cracking inconsistent with expansion, thereby influences the service life of heat exchanger.

The purpose of this utility model is to disclose that a kind of to solve the in use existing fume side heat transfer coefficient of traditional heat exchangers when designing according to the drum design considerations low, the external-heat flow backwards radiant exchanger of technical problems such as flue gas sealing difference and thermal expansion compensator difficult design.

The technical scheme that realizes the foregoing invention task is: the external-heat flow backwards radiant exchanger inserts smoke chamber by heat exchanger body and constitutes.Heat exchanger body is formed by connecting by bolt (22), nut (23), packing ring (24) after inserting overcoat by inner core.Inner core is formed by connecting with blind plate (3), air outlet slit (4), adpting flange (1), awl end spray tube (19), interior end socket (15), end section inner core (17) from top to bottom successively by air header (2); Overcoat is formed by connecting with air intlet (21), bracket (5), outer end socket (14), awl tube (13), thermal insulation fire-resistant concrete substrate (12) from top to bottom successively by urceolus (18).The smoke chamber of external-heat flow backwards radiant exchanger is by cylinder (9), descend two ends to connect top board (7) and flue dust outlet(discharge) flange (11) respectively thereon, descend side, two to connect gas approach (8) and exhanst gas outlet (16) respectively thereon, connect reinforcement gusset (10) and support (6) in its outside, constitute in its inboard lining thermal insulation fire-resistant concrete lining (20).

Partial structurtes in the such scheme have following version:

One, end section inner core (17) is that the flanged (FLGD) sidewall of air upstream end is provided with the cylinder of some spray orifices or the cylinder of the not flanged (FLGD) outside of air upstream end band spiral deflector, and when being the latter, the number of awl end spray tube (19) can reduce, even to zero.Two, awl end spray tube (19) is that the flanged (FLGD) other end of air upstream end has the sidewall of taper closing in to be provided with the cylinder of some spray orifices, and its number is 0～10.Three, air outlet slit (4) is connected with air collection tube (2) in air collection tube (2) any position, upper end (being included in the top of blind plate (3)).Four, gas approach (8) is connected with cylinder (9) with any direction (comprising tangential direction and secant direction) optional position all around, two ends up and down at cylinder (9) respectively with exhanst gas outlet (16).

Below in conjunction with accompanying drawing in detail the utility model is described in detail.

Fig. 1: external-heat flow backwards radiant exchanger cutaway view

The external-heat flow backwards radiant exchanger in the course of the work, high-temperature flue gas enters by cylinder (9), top board (7) and the smoke chamber that flue dust outlet(discharge) flange (11) surrounds from gas approach (8), transmits and leaves heat exchanger from exhanst gas outlet (16) after heat is given heat exchanger body and smoke chamber inwall.The then sedimentation in smoke chamber of part flue dust is discharged grey cabinet below being configured in flue dust outlet(discharge) flange (11) or the ash bucket.The air that gives heat enters the air distribution plenum that is surrounded by air collection tube (2), urceolus (18), adpting flange (1) etc. from air intlet (21), branch carries out restricted spray by the spray orifice of offering on awl end spray tube (19) sidewall to urceolus (18) 0～10 time and cools off, again by connect the end every tube (17) in the same way or the mode that flows of spiral crack to the end section of urceolus (18) and outside end socket (14) cool off, follow into center air header (2), discharge from air outlet slit (4) at last.Air behind cooling urceolus (18) and the outer end socket (14) has just become hot-air.It more than is operation principle of the present utility model.

When end section inner core (17) was the cylinder of the not flanged (FLGD) outside of air upstream end band spiral deflector, its length can increase so that partly or entirely replace the awl end sprayed tube (19).When awl end spray tube (19) all replaces is number when being zero, and end section inner core (17) then must be the cylinder of outside band spiral deflector, and heat exchange this moment principle is identical with the spiral radiation heat exchanger.When end section inner core (17) is flanged (FLGD) sidewall when being provided with the cylinder of spray orifice, the heat exchange principle is similar with full jet flow radiation recuperator principle.When the sidewall of end section inner core (17) does not have the number of spray orifice and awl end spray tube (19) when non-vanishing, the heat exchange principle is that jet flow and spiral combine.

Air gives hot temperature and is decided by the number of awl end spray tube (19) or the length of end section inner core (17).At heat-resistance stainless steel material 1C commonly used _rUnder the 18Ni 9Ti selection condition, consider the type selecting of blower fan and the dust stratification of some ash-laden gas heat exchanging device, the number that rule of thumb limits awl end spray tube can not be above 10.

According to the configuration needs, air outlet slit (4) can be located at the optional position, upper end of air header (2), is included in the top of blind plate (3).Same air intlet (21) can be located at optional position, urceolus (18) upper end, especially end section inner core (17) be under the cylinder situation of outside band spiral deflector there not being awl end spray tube (19), and air intlet (21) is from tangentially being provided with the reduction air intake resistance particular importance that just seems.

Gas approach (8) and exhanst gas outlet (16) require to decide according to Process configuration also needing where being connected of cylinder (9) side, top and bottom respectively.Thick dirt is more and when requiring sedimentation when containing in the flue gas, and the tangential or secant direction setting of gas approach (8) is the needs of depositing dust still not, and are to prevent that urceolus (18) from producing the needs of uneven wear.

Another embodiment of the present utility model is that two heat exchanger bodies are suspended on the Long Circle section, and establish in the smoke chamber of partition wall (partition wall is divided into smoke ventilator) centre.Flue gas advanced another from the end on the smoke chamber side and brought out this moment, and air is then connected and flow through two heat exchanger bodies, and this kind embodiment can reduce the height of entire equipment, meets some configuration requirement.

In the external-heat flow backwards radiant exchanger, flue gas is walked heat exchange barrel outside, not only makes flue gas itself to heat exchange barrel radiant heat transfer, and makes the smoke chamber inwall also to heat exchange barrel radiant heat transfer, thereby improved the radiation heat transfer coefficient of fume side.The gas flow of air side has jet flow, external spiral stream and 360 ° of slick and sly three kinds of modes of vortex motion of turning and forming.The type of flow that this jet flow, external spiral and " vortex " combine has been strengthened the convection heat transfer' heat-transfer by convection of air side greatly.This shows that this heat exchanger has adopted modern augmentation of heat transfer means to reach the highest heat exchange efficiency.

Heat exchanger body freely is suspended on the support (6), and vertically locatees by the bolt on the support (6), and hoop " V " the shape slit of itself and smoke chamber joint can be sealed by means such as fire-resistant concrete back-groutings.Smoke chamber does not have relative slip with body at work, and the sealing of smoke chamber can guarantee for a long time.The hot plate of heat exchanger body (constituting) and cold drawing by urceolus (18), outer end socket (14) and awl tube (13) (by air header (2), interior end socket (15) and the company end every tube formations such as (17)) have only an end to link to each other, the equal retractable of another suspended end does not have angle welding simultaneously.Therefore heat exchanger body in use can stress not be concentrated and is caused cracking and cause damaging.

By last analysis as can be known, the great advantage of external-heat flow backwards radiant exchanger is the heat exchange efficiency height, flue gas good airproof performance and long service life, and its heat exchange efficiency is the highest in the existing heat exchanger, its flue does not have any leakage or inhales the generation of cold wind phenomenon, and giving meter its service life can be more than 5 year.

The external-heat flow backwards radiant exchanger is applicable to exhaust gas temperature more than 1000 ℃, contains weak caking property fume amount at～50 gram/mark m ³The waste heat recovery of following various flame furnace flue gases, and reach 400～600 ℃ form waste heat is returned burner hearth to give hot combustion air temperature.

Claims

1, a kind of gas-gas type heat exchanger--external-heat flow backwards radiant exchanger, inserting smoke chamber by heat exchanger body constitutes, it is characterized in that heat exchanger body by air header [2] from top to bottom successively with blind plate [3], air outlet slit [4], adpting flange [1], awl end spray tube [19], interior end socket [15], the inner core that end section inner core [17] is formed by connecting, with by urceolus [18] from top to bottom successively with air intake [21], bracket [5], outer end socket [14], awl tube [13], the overcoat that thermal insulation fire-resistant concrete substrate [12] is formed by connecting is by bolt [22], nut [23], gas ket [24] is formed by connecting; Smoke chamber is by cylinder [9], descend two ends to connect top board [7] and flue dust outlet(discharge) flange [11] respectively thereon, descend side, two to connect gas approach [8] and exhanst gas outlet [16] respectively thereon, connect reinforcement gusset [10] and support [6] in its outside, constitute in its inboard lining thermal insulation fire-resistant concrete lining [20].

2, external-heat flow backwards radiant exchanger according to claim 1, it is characterized in that end section inner core (17) is the flanged (FLGD) cylinder of some spray orifices or the cylinder of the not flanged (FLGD) outside of air upstream end band spiral deflector of being provided with of air upstream end, when being the latter, the number of awl end spray tube (19) can reduce, even to zero.

3, external-heat flow backwards radiant exchanger according to claim 1 is characterized in that awl end spray tube (19) is that the flanged (FLGD) other end of air upstream end has the sidewall of taper closing in to be provided with the cylinder of some spray orifices, and its number is 0～10.

4, external-heat flow backwards radiant exchanger according to claim 1 is characterized in that air outlet slit (4) is connected with air header (2) in optional position, air header (2) upper end.

5, external-heat flow backwards radiant exchanger according to claim 1 is characterized in that gas approach (8) is connected with cylinder (9) with any direction in the optional position all around of cylinder (9) top and bottom respectively with exhanst gas outlet (16).