CN2073082U

CN2073082U - Heat exchanger with dust-collection

Info

Publication number: CN2073082U
Application number: CN 90201519
Authority: CN
Inventors: 黄文玉
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-02-11
Filing date: 1990-02-11
Publication date: 1991-03-13

Abstract

The utility model relates to a heat exchanger with dust-collection, which makes a dust collector be arranged in the front of a heat exchanger. Besides, the dust collector is integrated with the heat exchanger. The heat exchanger with dust-collection can ensure the dust collecting efficiency of the dust collector and the unblocking of the heat exchanger. Besides, the service life of the heat exchanger with dust-collection is prolonged. The heat exchanger with dust-collection can replace the existing cyclone dust collector, coal saving device and air preheater. The heat exchanger with dust-collection not only saves steel products, but also reduces occupation areas. The utility model is suitable for flue gas dust removing and waster heat recovery of industrial boilers and kilns of coal burning >=2t/h.

Description

Heat exchanger with dust-collection

A kind of dust-removing heat exchanger belongs to 〉=corollary equipment of 2t/h coal-burned industrial boiler afterbody, can replace existing cyclone dust collectors, and economizer and air give hot device.

Existing coal-burned industrial boiler afterbody, order is equipped with heat convection equipment (comprising that economizer and air give hot device), deduster and air-introduced machine, have at least three joint flues that they are contacted, the high temperature dust flue gas at first enters economizer and air gives hot device, enter the deduster dedusting after the cooling, enter chimney by air-introduced machine at last, such structure and connected mode have following shortcoming:

One, it is independent separately that economizer, air give hot device and three kinds of equipment of deduster, the cost height, and not only floor space is big for long connection flue, and it is many to leak out, rapid heat dissipation, and increased flowing resistance and material consumption.

Two, ash-laden gas is introduced into economizer and air gives hot device, causes the wearing and tearing of convection heating surface easily, reduction of service life.

Three, in boiler at low load when operation,, the cigarette temperature drops to below the dew point often, and the moisture in the flue gas easily sticks together with grit and is deposited on the heating surface and stops up exhaust gases passes, and cleaning bothers very much; So not only increased heat transmission resistance, reduced boiler thermal output, and made boiler positive pressuring combustion even burning not.

Four, the flue gas after the cooling enters deduster, the easier obstruction that causes ash hole, in case stop up, deduster is just ineffective, and has aggravated the wearing and tearing of inwall.

The purpose of this utility model provides a series of dust-removing heat exchangers, it is placed on deduster before the heat exchanger, forms a whole, and can guarantee efficiency of dust collection like this, keep from heat surface wear with stifled grey, and it can replace existing cyclone dust collectors, economizer and air to give hot device; Not only volume is little for it, and in light weight, has saved steel and has also reduced floor space.

The utility model is made up of cyclone dust device and heat exchanger two large divisions, and heat exchanger comprises that economizer and air give hot device.Deduster and heat exchanger package are combined in the casing, and deduster is at preceding casing, and heat exchanger is at rear box, and preceding casing is lighter and little than rear box, and on rear box, the front and back casing separates with dividing plate.Cabinet shell is the chuck that steel plate is welded into, and the effect of insulation and increase rigidity is arranged, and cyclone dust collectors are made by cast iron or pottery, and in the casing, its core pipe upper end is fixed on the dividing plate and is connected with rear box before being fixed by bolts to.Before casing also be gravity settling chamber, top is gas approach, there is clean-out hatch at the middle part, the bottom is a dust hopper, enough grey spaces that falls is arranged below the dust hopper.Through sufficient sedimentation separation, discharged by clean-out hatch and dust hopper respectively by grit in preceding casing for the high temperature dust flue gas, and the high-temperature flue gas that has purified enters rear box via the core pipe, and rear box top is economizer, and economizer can be steel pipe type or cast iron type.The steel pipe type economizer is welded by steel pipe and last lower perforated plate, and last lower perforated plate and rear box inwall are welded into water tank, and there is ball-cock assembly water tank upper end, and there is outlet pipe the lower end, and the high-temperature flue gas that has purified enters in the steel pipe, with the outer water heat exchange of steel pipe.The cast iron type economizer is existing finned cast iron pipe economizer, is fixed by bolts in the rear box, and water flows in cast iron pipe under certain pressure, and the fin that the high-temperature flue gas flush pipe is outer is with the water heat exchange in the pipe.Be that air gives hot device below the economizer, be welded by left and right sides tube sheet and steel pipe that be fixed by bolts to the rear box bottom, inlet of cold air and hot air outlet are in the same side of rear box, opposite side is an inspection cover.Usefulness for maintenance, flue gas after the cooling comes out to continue downwards from economizer, wash away the outer wall of steel pipe that air gives hot device, with the cold air heat exchange in the steel pipe, purify the exhanst gas outlet of cooled smoke through the rear box bottom and enter chimney by air-introduced machine, a small amount of tiny micronic dust is regularly discharged from rear box bottom purge hole.Hot air outlet inserts blower inlet, has not only improved fire box temperature, has also reduced aerodynamic noise.

The utility model is placed with cyclone dust collectors before the heat exchanger, and closely is connected as a single entity, and its advantage is:

One, the grit in the flue gas is pounced on collection three times in whole process, the efficiency of dust collection height.

Two, high-temperature flue gas is introduced into deduster, and the moisture in the flue gas is few, is difficult for stopping up ash hole.

Three, high-temperature flue gas enters heat exchanger after dedusting, has alleviated wearing and tearing greatly, has also avoided the dust stratification clogging, thereby has guaranteed the normal operation and the heat exchange efficiency of heat exchanger.

Four, flue gas goes out under enterprising, can be direct-connected with air-introduced machine, saved the connection flue, and reduced air leak rate of air curtain and flowing resistance, also reduced floor space, radiation loss and material consumption.

Five, hot-blast outlet links to each other with blower inlet, has reduced the noise of air blast.

The utility model will be further described below in conjunction with accompanying drawing:

Accompanying drawing 1, the front view of dust-removing heat exchanger.

Accompanying drawing 2, the left view of dust-removing heat exchanger.

(1) preceding casing (2) gas approach wherein, connect boiler flue gas outlet (3) cyclone dust collectors (4) dust hoppers (5) clean-out hatch (6) core pipes (7) dividing plates (8) ball-cock assemblys (9) rear box (10) economizers (11) water tanks (12) chucks (13) bolts (14) outlet pipes (15) inlet of cold airs (16) exhanst gas outlet, connect air-introduced machine import (17) hot air outlet, connect blower inlet (18) air and give hot device (19) inspection cover.

The high temperature dust flue gas enters preceding casing (1) by gas approach (2), the volume sudden enlargement, speed slows down, bulky grain is deposited at the bottom of the case owing to effect of inertia, discharge by clean-out hatch (5), flue gas enters rotation at a high speed in the cyclone dust collectors (3) subsequently, under action of centrifugal force, grit is pounced on collects dust hopper (4) lining, the high-temperature flue gas rotation that has purified is risen, and enters rear box (9) by core pipe (6) through dividing plate (7), successively gives hot device (18) with economizer (10) and air and carries out heat exchange, the cigarette temperature descends rapidly, and few micronic dust is deposited to the bottom by bump and is discharged by clean-out hatch (5).Purify cooled smoke and enter chimney through exhanst gas outlet (16).Cold water enters water tank (11) by ball-cock assembly (8), and hot water injects boiler barrel through outlet pipe (14).Cold air enters air by inlet of cold air (15) and gives hot device, and hot-air blasts boiler furnace through hot air outlet (17).

Claims

A kind of dust-removing heat exchanger, it is placed on cyclone dust collectors before the heat exchanger, and be combined in the casing, it is characterized in that: cyclone dust collectors are at preceding casing, economizer and air give hot device at rear box, the front and back casing separates with dividing plate, and the core pipe upper end of cyclone dust collectors is fixed on the dividing plate, is connected with rear box.