CN2328971Y

CN2328971Y - Water drop type tube air preheater

Info

Publication number: CN2328971Y
Application number: CN 98220287
Authority: CN
Inventors: 窦世山; 李明; 从培军; 马清森; 李庆领
Original assignee: HONGWEI CHEMICAL EQUIPMENT FACTORY WEIFANG
Current assignee: HONGWEI CHEMICAL EQUIPMENT FACTORY WEIFANG
Priority date: 1998-02-16
Filing date: 1998-02-16
Publication date: 1999-07-14
Anticipated expiration: 2008-02-16

Abstract

The utility model relates to a water drop-shaped pipe air preheater which is characterized in that a plurality of air flowing pipes whose cross sections are in a water drop shape form an air channel; the big ends of the cross sections of the water drop-shaped pipes face the coming direction of smoke gas; the flue gas flows on the outer sides of the water drop-shaped pipes to flush the water drop-shaped pipes transversally to achieve the purpose of heatsing air in the pipes. The utility model has the advantages of little resistance for the flow of the flue gas, high heat exchanging efficiency, compact structure, high durability, and favorable energy saving effect.

Description

Water droplet shape tube air preheater

The utility model relates to the heat-exchange apparatus technical field that heat exchange medium does not directly contact, and relates to a kind of air preheater that waste heat of flue gas of heating furnace reclaims that is used for specifically.

At present, used air preheater mostly is heat pipe-type or circular pipe type in the flue gas waste heat recovery system of petroleum chemical industry heating furnace.The basic heat transfer element of heat pipe preheater is a heat pipe, though the heat exchange efficiency height, compact conformation, its shortcoming is that the easy explosion of heat pipe was lost efficacy, service life is short.The basic heat transfer unit of circular pipe type air preheater is a pipe, and its advantage is durable in use, but flue gas is horizontal when plunderring pipe, can form the Disengagement zone of broad at its afterbody, produce bigger form drag, and mean heat transfer coefficient is low.Therefore the air preheater of above-mentioned two kinds of forms can not satisfy the needs in the production under many circumstances.

The purpose of this utility model be exactly to provide a kind of heat transfer coefficient height, flow of flue gas resistance little, experience all sorts of durable air preheater.

The technical solution of the utility model is: it has housing and the tube sheet of fixedlying connected with housing, the top and bottom of housing are connected with exhanst gas outlet tube head and gas approach tube head respectively, its design feature is to be horizontally installed with the circulation of air pipe that some cross sectional shapes are water droplet shape on tube sheet, constitute air duct, be separately installed with air intake tube head and air outlet slit tube head with corresponding position, circulation of air tube end position in the tube sheet outside.

The big end of water droplet shape circulation of air pipe cross section of the present utility model comes flow path direction towards flue gas.The air duct that is made of water droplet shape circulation of air pipe can be provided with a plurality of backhauls in housing, an end of adjacent return air runner pipe is communicated with by the bend that is fixed on the tube sheet.

The utility model has the advantages that: adopting the water drop shaped tube is basic heat transfer element, the cross sectional shape that is the circulation of air pipe is a water droplet shape, thereby greatly reduce the flue gas circulating resistance, the heat exchange efficiency height, and be convenient to make and install, operating flexibility is big, compact conformation, durable in use, good reliability, be particularly suitable for the flue gas waste heat recovery of petroleum chemical industry heating furnace, have good energy-conservation consumption reduction effect.

Below in conjunction with drawings and Examples the utility model is further described.

Fig. 1 is a front view of the present utility model;

Fig. 2 is a water droplet shape circulation of air pipe section schematic layout pattern;

Fig. 3 is another embodiment water droplet shape circulation of air pipe section schematic layout pattern.

In the embodiment that accompanying drawing provides, the utlity model has the housing 1 of steel construction, the two ends, the left and right sides of housing 1 are fixedly connected with tube sheet 6, the top and bottom of housing 1 are connected with exhanst gas outlet tube head 2 and smoke inlet tube head 10 respectively, have heat-insulation layer 4 in the inboard of housing 1 and exhanst gas outlet tube head 2 and smoke inlet tube head 10.Being horizontally installed with some cross sectional shapes on tube sheet 6 is the circulation of air pipe 3 of water droplet shape, and each backhaul can be arranged 22 pipes, constitutes air duct.The big end of the cross section of these water droplet shape circulation of air pipes 3 comes flow path direction towards flue gas during installation.The layout of pipe can be by triangle (see figure 3) or square (see figure 2) layout.The air duct that is made of water drop shaped tube 3 can be provided with single backhaul in housing 1, also can be a plurality of backhauls, for example two journeys, three journeys (as shown in Figure 1), quadruple pass etc.When multipass was set, an end of two groups of circulation of air pipes 3 of adjacent backhaul was connected by the bend 5 that is fixed on the tube sheet 6, and bend 5 is made of bend pipe 8 and the rock wool heat-preservation layer 9 that is coated on bend pipe 8 outsides.The entrance point and the port of export at tube sheet 6 outside air passages are separately installed with air intake tube head 7 corresponding with circulation of air pipe 3 end positions and air outlet slit tube head 11.Air flows in water drop shaped tube 3 during work, and flue gas is realized the heat transfer purpose at water drop shaped tube 3 flows outside transversal flow water drop shaped tubes.

Claims

1, a kind of water droplet shape tube air preheater, have housing (1) and the tube sheet (6) of fixedlying connected with housing (1), the top and bottom of housing (1) are connected with exhanst gas outlet tube head (2) and gas approach tube head (10) respectively, it is characterized in that: being horizontally installed with some cross sectional shapes on tube sheet (6) is the circulation of air pipe (3) of water droplet shape, constitute air duct, be separately installed with air intake tube head (7) and air outlet slit tube head (11) with circulation of air pipe (3) end position corresponding position in tube sheet (6) outside.

2,, it is characterized in that the big end of water droplet shape circulation of air pipe (3) cross section comes flow path direction towards flue gas according to the described water droplet shape of claim 1 tube air preheater.

3, according to the described water droplet shape of claim 1 tube air preheater, it is characterized in that in housing (1) a plurality of backhauls can being set by the air duct that water droplet shape circulation of air pipe (3) constitutes, an end of the circulation of air pipe (3) of adjacent backhaul is connected by the bend (5) that is fixed on the tube sheet (6).