CN200958911Y

CN200958911Y - Composite air preheater

Info

Publication number: CN200958911Y
Application number: CNU2006201052108U
Authority: CN
Inventors: 阎西祥
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-06-29
Filing date: 2006-06-29
Publication date: 2007-10-10
Anticipated expiration: 2016-06-29

Abstract

The utility model discloses a compound air preheater comprising of a shell and a steel tube bundle, as well as an air cavity and a flue gas cavity which separated through a sagging plate at the middle of the shell. Thermotube bundles are arranged on the tops of the air cavity and the flue gas cavity, the steel tube bundle is arranged below the flue gas cavity, an air inlet and a flue gas inlet are respectively arranged on the top and bottom of the air cavity and the flue gas cavity, a flue gas outlet and an air outlet are respectively positioned on the top and side of the flue gas cavity. By adopting the structure, the flue gas arrives flue gas cavity through the flue gas inlet, and then the flue gas passes through firstly the steel tube bundle part at the inferior part of the flue gas cavity and then the thermotube bundles at the top of flue gas cavity to release heat; and air arrives the air cavity through the air inlet, and then air firstly passes through the thermotube bundles at the top of the air cavity to get heat and then flows into the inferior part of the air cavity, and then goes into the inferior part of the flue gas cavity through the sagging plate, and finally gets heat from the steel tube bundle part through the steel tube shell. The utility model can prevent a dew point corrosion and increase the thermal efficiency of a heating furnace and has a good cost performance ratio.

Description

The composite air preheater

Technical field

The utility model relates to petrochemical industry heating furnace accessory, relates in particular to the composite air preheater, is applicable to the heating furnace waste heat recovery of oil refining industry.

Background technology

Heating furnace is the main energy supply and the energy consumption equipment of oil-refining chemical industry, and in short supply with the international petroleum resource, heating furnace energy-conservation are subjected to great attention, and air preheater has obtained general application in the heating furnace industry.The form of air preheater again to enamel pipe, is added forms such as heat pipe, heat carrier, revolving body from the turbolator to the glass tube, for enterprise energy-conservation made huge contribution.Several air preheaters are vied each other in industries such as petrochemical industry, electric power, iron and steel, present the situation of various air preheater coexistences.But take all factors into consideration, the pros and cons that the air preheater of different types is had nothing in common with each other, the steel tubular air heater device fabrication is simple, but dew-point corrosion resistant is poor, there is serious delta-shaped region corrosion, though the Air Preheaters with Enamelled Tubers of Yan Bianing had solved etching problem afterwards, the cost height, cost performance is not high on middle-size and small-size heating furnace.Heat-pipe air preheater heat exchange effect in specific temperature range is remarkable, but has surpassed its ability to work in the humidity province more than 300 ℃, causes the booster and the inefficacy of similar Domino effect, and year crash rate is greater than more than 5%, and the cycle of operation is obviously too short.

Summary of the invention

Technical problem to be solved in the utility model is at above-mentioned deficiency, provides a kind of and can prevent dew point corrosion, can improve thermal efficiency of heating furnace again, and has good cost performance composite air preheater.It has the advantage of integrated porcelain enamel steel tube air preheater and heat-pipe air preheater concurrently.

The utility model solves the problems of the technologies described above the technical scheme that is adopted: the composite air preheater, comprise the tube bank of housing and steel pipe, the technical measures of taking specifically comprise: housing separates through sagging plate and is air cavity and flue gas cavity, this air cavity and flue gas cavity top are provided with the heat pipe tube bank, this flue gas cavity bottom is provided with the steel pipe tube bank, and air cavity top is shaped on air intake, and flue gas cavity bottom is shaped on smoke inlet, top is shaped on exhanst gas outlet, and sidepiece is shaped on air outlet slit.

The technical measures of taking specifically also comprise: the evaporation of medium is in condensation in restraining for ease of heat pipe; The air chamber side is inclined upwardly slightly, is preferably 10 degree to 15 degree.

The steel pipe tube bank of flue gas cavity bottom is horizontal positioned, and the steel pipe tube bank outside is welded with fin, and the inboard is provided with the insert that increases disturbance.

Compared with prior art, air cavity and flue gas cavity that the utility model housing separates through sagging plate, this air cavity and flue gas cavity top are provided with the heat pipe tube bank, this flue gas cavity bottom is provided with the steel pipe tube bank, air cavity top is shaped on air intake, flue gas cavity bottom is shaped on smoke inlet, and top is shaped on exhanst gas outlet, and sidepiece is shaped on air outlet slit.To the flue gas cavity, flue gas is earlier through flue gas cavity bottom steel pipe tube bank part, again through heat pipe tube bank the carrying out heat release of flue gas cavity top through smoke inlet for this fume; To the air cavity, air through heat pipe tube bank the carrying out heat-obtaining on air cavity top, flows into air cavity bottom earlier to air through air intake, and the steel pipe tube bank shell side that enters flue gas cavity bottom through sagging plate again carries out heat-obtaining.Can prevent dew point corrosion, can improve thermal efficiency of heating furnace again, and have good cost performance.

Description of drawings

Fig. 1 is the utility model example structure schematic diagram.

The specific embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

Shown in Figure 1, the composite air preheater, comprise housing 1 and steel pipe tube bank 5, air cavity 2 and flue gas cavity 3 that housing 1 separates through sagging plate 6, this air cavity 2 and flue gas cavity 3 tops are provided with heat pipe tube bank 4, and these flue gas cavity 3 bottoms are provided with steel pipe tube bank 5, air cavity 2 tops are shaped on air intake 21, flue gas cavity 3 bottoms are shaped on smoke inlet 31, and top is shaped on exhanst gas outlet 32, and sidepiece is shaped on air outlet slit 33.Air cavity 2 sides are inclined upwardly 10 degree slightly to 15 degree.The evaporation of being convenient to medium in the heat pipe tube bank 4 is in condensation.The steel pipe tube bank 5 of flue gas cavity 3 bottoms is a horizontal positioned, and steel pipe is restrained 5 outsides and is welded with fin, and the inboard is provided with the insert that increases disturbance.

Advance flue gas B through smoke inlet 31 to flue gas cavity 3, flue gas is earlier restrained 5 parts through flue gas cavity 3 bottom steel pipes, heat release is carried out in 3 top heat pipes tube banks 4 through the flue gas cavity again, goes out flue gas D from exhanst gas outlet 32 again; Advance air A through air intake 21 to air cavity 2, air carries out heat-obtaining through the heat pipe tube bank 4 on air cavity 2 tops earlier, flow into air cavity 2 bottoms, enter flue gas cavity 3 bottom steel pipe tube bank shell sides 5 parts again through sagging plate 6 and carry out heat-obtaining, go out air C from air outlet slit 33 again.

The utility model is integrated steel pipe air preheater and heat-pipe air preheater, reclaims inferior flue gas heat in low-temperature zone with heat pipe, has guaranteed the working environment of heat pipe, gives full play to the exchange capability of heat of heat pipe; Reclaim the high-temperature flue gas heat in high temperature section with steel pipe, improved tube wall temperature, avoided the corrosion of cold wind end delta-shaped region.Formed novel compound air preheater thus, existing stronger heat exchange effect, anticorrosive again, and prolong service life.It can be placed on heating furnace convection cell top, also can place on the ground, decides on concrete field condition.

Most preferred embodiment of the present utility model is illustrated, and various variations or the remodeling made by those of ordinary skills can not break away from scope of the present utility model.

Claims

1, composite air preheater, comprise housing (1) and steel pipe tube bank (5), it is characterized in that: air cavity (2) and flue gas cavity (3) that described housing (1) separates through sagging plate (6), this air cavity (2) and flue gas cavity (3) top are provided with heat pipe tube bank (4), this flue gas cavity (3) bottom is provided with steel pipe tube bank (5), described air cavity (2) top is shaped on air intake (21), described flue gas cavity (3) bottom is shaped on smoke inlet (31), top is shaped on exhanst gas outlet (32), and sidepiece is shaped on air outlet slit (33).

2, composite air preheater according to claim 1 is characterized in that: the acclivitous slightly angle of described air cavity (2) side is that 10 degree are to 15 degree.

3, composite air preheater according to claim 2 is characterized in that: the steel pipe tube bank (5) of described flue gas cavity (3) bottom is a horizontal positioned, and steel pipe tube bank (5) outside is welded with fin, and the inboard is provided with the insert that increases disturbance.