CN2254534Y

CN2254534Y - Plate type air preheating device

Info

Publication number: CN2254534Y
Application number: CN95225300U
Authority: CN
Inventors: 刘宗良; 王洪军; 丛培军; 吕兰尚; 宋丰来; 窦世山; 李明
Original assignee: CNPC East China Survey Design & Research Institute
Current assignee: CNPC East China Survey Design & Research Institute
Priority date: 1995-11-14
Filing date: 1995-11-14
Publication date: 1997-05-21
Anticipated expiration: 2005-11-14

Abstract

The utility model relates to a heating furnace device used in the field of petrochemical industry or an air preheater used for recovering the waste heat of smoke gas in industrial furnaces for utilization. An air flow passage P is composed of two parallel heat exchanging plates 2, the upper and the lower ends are sealed, and the left and right ends are opened. Air flows along the horizontal direction in the rectangular flow passage. A smoke gas 0 is composed of two parallel heat exchanging plates 2 which are adjacent to the air flow passage P, the left and the right ends are sealed, and the upper and the lower ends are opened. Smoke gas flows along the vertical direction in the rectangular flow passage, and protrusions 8 are welded on heat exchanging plates 2. Protrusions are welded on both sides of a flat plate, so that the action of heat transfer enhancement is provided, and the overall heat transferring area can be reduced. As a result, steel is saved, and the cost of the heating furnace device is reduced. The utility model has the advantages of compact structure, easy manufacture, convenient installation, large operating flexibility, high heat exchanging efficiency, and high reliability.

Description

A kind of plate air preheater

The utility model relates to heating furnace device in a kind of petrochemical industry or the industrial furnace fume waste heat air preheater in recycling.

At present, heating furnace device in the petrochemical industry or industrial furnace fume waste heat reclaim main tubular air preheater and the heat pipe preheater of adopting.The basic principle of air preheater is to utilize the fume waste heat preheating for the burner combustion air, improve the air charging temperature, minimizing recepts the caloric after going into stove, reduces exhaust gas temperature, reduce the heat that smoke evacuation is taken away, reach energy-conservation purpose, the basic heat transfer unit of tubular air preheater is light pipe or spiral grooved tube, and this preheater heat exchange area per unit volume is little, heat exchange efficiency is low, structure is huge, and sealing is poor, the equipment investment height; The basic heat transfer unit of heat pipe preheater is a heat pipe, and this preheater has compact conformation, characteristics that heat transfer efficiency is high, but because the heat pipe resistance to elevated temperatures is poor, require the flue-gas temperature fluctuation little, be difficult in the engineering reality guarantee, heat pipe failure rate height, operational reliability is poor.

The purpose of this utility model is to provide a kind of compact conformation, the heat exchange efficiency height, and operating flexibility is big, and operational reliability is high and can be widely used in high temperature and close plate air preheater in the cloud of dust gas Waste Heat Recovery.

The utility model adopts following technological means: air flow channel P is made of side by side two heat exchanger plates 2, and upper and lower end sealing, left and right end is open-minded, in establish the horizontal direction barrier and form rectangularl runner, flue gas flow channel 0 is made up of the heat exchanger plates 2 between two adjacent air flow channel P and the sealing of left and right end, upper and lower end is open-minded, in establish the vertical direction barrier and form rectangularl runner, establish rectangle expansion loop 3 between plate package and the air intlet 4, plate package is supported by fixed support 7, the internal layer of steel construction 1 is established insulating lining 6, is welded with protrusion 8 on the heat exchanger plates 2.

Advantage of the present utility model is: owing to the employing rectangular channel and at dull and stereotyped two face down bonding system protrusions, has the augmentation of heat transfer effect, can significantly reduce total heat conduction area, thereby the saving steel reduce equipment manufacturing cost, and this preheater is under the identical condition of thermic load, exhaust gas volumn, air capacity, heat transfer temperature difference, total cost is about 1/2 of tubular air preheater, more lower slightly than heat pipe preheater, service life and tubular air preheater are suitable, are 2-4 times of heat pipe preheater.Have compact conformation, be easy to make, be convenient to install, operating flexibility is big, heat exchange efficiency height, high reliability features.

Fig. 1 is the utility model longitudinal profile structure chart;

Fig. 2 is the plate package structure chart.

Below in conjunction with accompanying drawing the utility model is done detailed description:

As Fig. 1, shown in Figure 2: the utility model is by steel construction 1, heat exchanger plates 2, rectangle expansion loop 3, air outlet slit 4, air intake 5, insulating lining 6, fixed support 7, protrusion 8 is formed, air flow channel P is made of side by side two heat exchanger plates 2, and on, lower end closed, a left side, right-hand member is open-minded, in establish the horizontal direction barrier and form rectangularl runner, flue gas flow channel 0 is made up of and a left side the heat exchanger plates 2 between two adjacent air flow channel P, the right-hand member sealing, on, the lower end is open-minded, in establish the vertical direction barrier and form rectangularl runner, establish rectangle expansion loop 3 between plate package and the air intlet 4, plate package is supported by fixed support 7, the internal layer of steel construction 1 is established insulating lining 6, be welded with protrusion 8 on the heat exchanger plates 2, steel construction 1 be positioned at preheater below, mainly play and fix and be connected effect.

Specific embodiment is: heat exchanger plates 2 both sides are welded with many protrusions 8, as square or oval nail is first-class, side at heat exchanger plates 2 connects with rectangle expansion loop 3, the two ends of heat exchanger plates 2 are respectively air outlet slit 4 and air intake 5, between heat exchanger plates 2 and the steel construction 1 fixed support 7 is arranged, with the basic heat transfer unit of heat exchanger plates conduct, heat exchanger plates is formed by the many square or oval ailheads of dull and stereotyped two face down bonding systems, adjacent heat exchanger plates end flanging butt joint sealing forms the rectangle gas flow, the polylith pin-fin plate is formed plate package, plate package is placed on the fixed support, before, after be connected with the air gateway respectively, absorb thermal expansion by rectangle expansion loop 3, eliminate thermal stress, it is up and down the flue gas gateway, adpting flange is all established in preheater and extraneous joint, make compact conformation, easy for installation, 2 liang of face down bonding system protrusions 8 of heat exchanger plates can improve the turbulivity of fluid, the expansion heat exchange area, plate package is supported by fixed support 7, can on fixed support 7, slide during the plate package expanded by heating, swell increment is absorbed by rectangle expansion loop 3, eliminate thermal stress, prolong service life of equipment, air is entered the air flow channel of plate package by air intake 5, heat up with the hot flue gas heat exchange in the adjacent channels, flow out by air outlet slit 4 through rectangle expansion loop 3.Flue gas enters the flue gas flow channel of plate package by the preheater bottom, with the cold air heat exchange cooling in the adjacent channels, is flowed out by preheater top, finishes whole heat transfer process, and 6 insulation effects of insulating lining reduce radiation loss.

Claims

1, a kind of plate air preheater, by steel construction (1), heat exchanger plates (2), rectangle expansion loop (3), air outlet slit (4), air intake (5), insulating lining (6), fixed support (7), protrusion (8) is formed, it is characterized in that: air flow channel P is made of side by side two heat exchanger plates (2), on it, lower end closed, a left side, right-hand member is open-minded, in establish the horizontal direction barrier and form rectangularl runner, flue gas flow channel 0 is made up of the heat exchanger plates (2) between two adjacent air flow channel P, its left side, the right-hand member sealing, on, the lower end is open-minded, in establish the vertical direction barrier and form rectangularl runner, establish rectangle expansion loop (3) between heat exchanger plates (2) and the air intlet (4), heat exchanger plates (2) is supported by fixed support (7), and the internal layer of steel construction (1) is established insulating lining (6).

2, plate air preheater according to claim 1 is characterized in that: heat exchanger plates (2) both sides are welded with protrusion (8).