CN201203140Y

CN201203140Y - Plate shell type air pre-heating device

Info

Publication number: CN201203140Y
Application number: CNU2008200705341U
Authority: CN
Inventors: 虞戈同; 许栋五
Original assignee: LUOYANG SENDE PETROCHEMICAL ENGINEERING Co Ltd
Current assignee: LUOYANG SENDE PETROCHEMICAL ENGINEERING Co Ltd
Priority date: 2008-05-16
Filing date: 2008-05-16
Publication date: 2009-03-04
Anticipated expiration: 2018-05-16

Abstract

The utility model discloses a plate-shell type air preheater which is formed by connecting a plurality of metal heat transfer plates, wherein, each heat transfer plate (2) is square; both sides of each transfer plate (2) are provided with upward right-angle hems (6), and the other two sides are provided with downward right-angle hems (7); each right-angle hem (6) is also provided with a connection surface (5) with an outward hem of 90 DEG; the connection surface (5) is used for welding and connecting the plates (2); the connection surface (5) of the downward or upward right-angle hem of one heat transfer plate (2) is involuted and connected with the connection surface (5) of the upward or downward right-angle hem of the other heat transfer plate (2) to form a passage unit (4); and the upward heat transfer plate and the downward heat transfer plate of the passage unit (4) are respectively connected with other heat transfer plates through the connection surfaces (5) of the upward or downward right-angle hems to form two passage units. The heat transfer plates are connected to form a group of passage units in the connection mode. The circulation directions of the adjacent passage units in the passage units are mutually perpendicular. A plurality of groups of passage units are connected to form the plate-shell type air preheater.

Description

The shell-and-plate air preheater

Technical field

The utility model belongs to the air preheater technology, a kind of shell-and-plate air preheater of main proposition, applicable to the flue gas waste heat recovery of refinery's heating furnace, boiler of power plant, steel mill's converter, also can be used for simultaneously printing and dyeing, grain and other dry waste heat recovery with hot-blast stove.

Background technology

Along with expanding economy, environmental protection, requirements of saving energy are improved day by day, require that enterprise cuts down the consumption of energy aborning, the temperature of reduced exhaust flue gas.And the waste heat that adopts air preheater to reclaim in the flue gas is direct, the simplest a kind of method.The the 60 to 70's enterprise air preheaters that adopt are bundled tube more; Eight, the nineties enterprise mostly is heat pipe preheater.The shortcoming that the bundled tube air preheater exists is: 1, heat transfer coefficient is low, causes the overall heat-transfer coefficient of preheater to diminish, will be big for the heat exchange area that reclaims same caloric requirement.2, bulky, as previously mentioned, overall heat-transfer coefficient diminishes, and the heat exchange area that needs will be big, add design feature, make that the volume of preheater is very huge.The shortcoming that heat pipe preheater exists is: 1, serviceability temperature is restricted, and what generally adopt is the steel-water heat pipe structure.The too fast meeting of conducting heat causes heat pipe to be blasted, and causes the accident.2, poor reliability is because steel-water heat pipe production process complexity needs steel pipe is carried out pickling and alkali cleaning, add pure water then and vacuumize, any one link goes wrong, and can cause the water evaporation in the pipe, produce fixed gas, vacuum descends in causing managing, and causes heat-pipe air preheater to lose efficacy.3, easy dust stratification, heat pipe generally near horizontal positioned, twine spacing again and are 2-3 millimeters fin simultaneously on the pipe in device, be easy to fouling and dust stratification, because fouling and dust stratification make the Heat Transfer of Heat Pipe on Heat Pipe coefficient descend, and cause the waste heat recovery ability drop of heat-pipe air preheater.4, cost height, because manufacturing process's complexity of heat pipe, the cost of heat pipe preheater is higher.

Summary of the invention

The purpose of this utility model promptly is to propose a kind of shell-and-plate air preheater, makes it have the heat transfer property height, is not subjected to the shortcoming that flue-gas temperature limits and volume is little, simple in structure and cost is low.

The utility model is finished the invention task by the following technical solutions: a kind of shell-and-plate air preheater, and its metal heat transfer plate that is be arranged in parallel by multi-disc links and constitutes; Heat transfer plate is a square, and its both sides have right angle flanging upwards, and both sides have downward right angle flanging in addition, and described right angle flanging also has 90 ° of outside flangings and constitutes the conjunction plane that welding connects between plate and the plate; Link by two heat transfer plates and to constitute a channel unit, promptly by a slice heat transfer plate downward or upward the right angle flanging conjunction plane and another sheet heat transfer plate up or down the involutory one that connects of conjunction plane of right angle flanging constitute a channel unit, the upper and lower heat transfer plate of this channel unit by its up or down the conjunction plane of right angle flanging connects with other heat transfer plate respectively again the formation channel unit, the multi-disc heat transfer plate is linked by above-mentioned connecting mode and constitutes one group of a plurality of channel unit, and its circulating direction of channel unit adjacent in a plurality of channel units that constituted is vertical mutually; To organize channel unit more and connect one formation shell-and-plate air preheater.

Preheater is connected with flue and air duct respectively during use, smoke inlet is vertical mutually with air intake, wherein the odd number passage is exhaust gases passes or air duct, and even-numbered channels is air duct or exhaust gases passes, and promptly exhaust gases passes is provided with at interval with air duct and is vertical mutually.High-temperature flue gas evenly enters a plurality of parallel exhaust gases passes of shell-and-plate preheater by flue, Cryogenic air evenly enters a plurality of parallel air ducts of preheater, carry out the heat transmission by heat transfer plate, the final exhaust gas temperature of realizing reducing flue gas, the purpose of raising air exit temp.

The shell-and-plate air preheater that the utility model proposes, the structural design advantages of simple, heat transfer property is good.

Description of drawings

Fig. 1 is the utility model structural representation.

Fig. 2 is the structural representation of heat transfer plate in the utility model.

Fig. 3 is for being connected the schematic diagram that constitutes a channel unit by two heat transfer plates.

Among the figure, 1, outside framework, 2, heat transfer plate, 4, channel unit, 5, conjunction plane, 6, upward folded, 7, to lower hem.

The specific embodiment

In conjunction with the accompanying drawings the utility model embodiment is illustrated:

As shown in Figure 1, the metal heat transfer plate that the utility model shell-and-plate air preheater is be arranged in parallel by multi-disc links and constitutes, the circulating direction that the preheater that is constituted has a plurality of parallel passages and adjacency channel is vertical mutually, and promptly exhaust gases passes is provided with at interval with air duct and is vertical mutually.As shown in Figure 2, heat transfer plate 2 is for by thickness being the square plate that the cold-reduced sheet of 1.2～1.5mm is stamped to form, its the right and left is downward right angle flanging 7, both sides are the 90 ° of flangings 6 that make progress before and after it, and flanging up and down has 90 ° of outside flangings and constitutes the conjunction planes 5 that connect with another heat transfer plate welding.As shown in Figure 3, per two heat transfer plates link and constitute a channel unit, promptly so that wherein conjunction plane 5 and another sheet heat transfer plate the right and left on the both sides, front and back upward folded 6 of a slice heat transfer plate combine as a whole to the conjunction plane 5 involutory welding of lower hem 7, constitute a channel unit 4, these two heat transfer plates connect two channel units of formation with other heat transfer plate with this connecting mode respectively again; The multi-disc heat transfer plate connects one group of a plurality of channel unit of formation thus; Its circulating direction of channel unit adjacent in a plurality of channel units is vertical mutually; More many group channel units connection formation shell-and-plate air preheaters promptly will be organized channel unit according to the physical dimension of needed heat transfer load and heating furnace and make up connection, in order to increase the heat exchange effect, prevent the thermal deformation of heat transfer plate, in every layer of passage, can add the V-type flow deflector, consider the integral intensity requirement simultaneously, with the framework of angle steel as the shell-and-plate air preheater.During use the shell-and-plate air preheater is connected with air duct with flue respectively by flange and gets final product, wherein, the flue inlet is mutual vertical with the air duct inlet.

Claims

1, a kind of shell-and-plate air preheater is characterized in that: the metal heat transfer plate that described air preheater is be arranged in parallel by multi-disc links and constitutes; Heat transfer plate (2) is a square, and its both sides have right angle flanging (6) upwards, and both sides have downward right angle flanging (7) in addition, and described right angle flanging also has 90 ° of outside flangings and constitutes the conjunction plane (5) that welding connects between plate and the plate; Link by two heat transfer plates and to constitute a channel unit, promptly by a slice heat transfer plate downward or upward the conjunction plane of right angle flanging (5) and another sheet heat transfer plate up or down the involutory one that connects of the conjunction plane of right angle flanging (5) constitute a channel unit (4), on this channel unit, following heat transfer plate by its up or down the conjunction plane of right angle flanging connects with other heat transfer plate respectively again the formation two channel units, the multi-disc heat transfer plate is linked by above-mentioned connecting mode and constitutes one group of a plurality of channel unit, and its circulating direction of channel unit adjacent in a plurality of channel units that constituted is vertical mutually; To organize channel unit more and connect one formation shell-and-plate air preheater.