CN209978079U

CN209978079U - High-efficiency heat exchange device for recycling heat of boiler tail gas

Info

Publication number: CN209978079U
Application number: CN201920761710.4U
Authority: CN
Inventors: 王玢; 刘小兵; 王杰; 安晓亮
Original assignee: SHANXI JIXIANG BOILER MANUFACTURE Co Ltd
Current assignee: SHANXI JIXIANG BOILER MANUFACTURE Co Ltd
Priority date: 2019-05-24
Filing date: 2019-05-24
Publication date: 2020-01-21
Anticipated expiration: 2029-05-24

Abstract

The utility model discloses a high-efficiency heat exchange device for recovering heat of boiler tail gas, belonging to the boiler field; the technical problem to be solved is to provide a heat exchange device with strong corrosion resistance and high heat exchange efficiency; the technical scheme for solving the technical problem is as follows: a high-efficiency heat exchange device for recovering heat of boiler tail gas comprises a closed box body, wherein a smoke inlet is formed in the left side of the closed box body, a smoke outlet is formed in the right side of the closed box body, a circulating heat exchange tube is arranged in the closed box body and is a steel-aluminum composite finned tube, a liquid inlet is formed in one side of the closed box body, a liquid outlet is formed in the other side of the closed box body, and a heat insulation layer is arranged on the outer wall; the utility model discloses but wide application in boiler waste heat recovery field.

Description

High-efficiency heat exchange device for recycling heat of boiler tail gas

Technical Field

The utility model relates to a retrieve thermal high-efficient heat transfer device of boiler tail gas belongs to boiler technical field.

Background

In order to implement national policies of energy conservation and environmental protection, boiler manufacturers and users recycle the preheating of boilers as much as possible, so that the heat loss of exhaust smoke of the boilers is reduced, the heat efficiency of the boilers is improved, the energy consumption and the operating cost of the boilers are saved, most of the existing common boiler waste heat recovery devices are light-pipe type convective heat exchange structures, the devices with the structures are large in size, complex in installation and maintenance, low in heat exchange coefficient, high in manufacturing cost and incapable of achieving an ideal heat exchange effect and meeting the national energy conservation and emission reduction standards, and the conventional convective heat exchange structures using steel finned tubes are adopted, so that the heat exchange coefficient of the structures is large, the finned tubes are seriously corroded, the temperature after heat exchange can only reach about 120 ℃, the service life is short, meanwhile, the heat preservation capability of the heat exchange devices is poor, the surface heat dissipation loss is caused.

SUMMERY OF THE UTILITY MODEL

The utility model overcomes prior art exists not enough, provides a heat transfer device that corrosion resistance is strong, and heat exchange efficiency is high.

In order to solve the technical problem, the utility model discloses a technical scheme be: the utility model provides a retrieve thermal high-efficient heat transfer device of boiler tail gas, including the airtight box, airtight box left side is provided with into the mouth, the right side is provided with the outlet flue, inside is provided with the heat transfer pipe that circulates, the heat transfer pipe is the finned tube, the heat transfer pipe that circulates is provided with the inlet in airtight box one side, the opposite side is provided with the liquid outlet, be provided with the heat preservation on the box outer wall, the heat preservation includes inlayer aluminium silicate fiber felt heat preservation, middle level thermal-insulated aluminium foil cloth, outer aluminium silicate fiber heat preservation, inlayer aluminium silicate fiber heat preservation contacts with airtight box outer wall, inlayer aluminium silicate fiber heat preservation outside is provided with middle level thermal-insulated aluminium foil.

The circulating heat exchange tube is a steel-aluminum composite finned tube.

The space between the fins of the circulating heat exchange tube is 4 ~ 8 mm.

The closed box body is made of a galvanized plate.

And a condensed water outlet is arranged at the bottom of the closed box body.

Compared with the prior art, the utility model has the following beneficial effects of set up the three-layer heat preservation in the box outside, the box uses the galvanized sheet material, the heat dissipation loss on reduction surface that can furthest, furthest's the waste heat of utilizing the boiler simultaneously, can effectual improvement boiler's thermal efficiency, the finned tube uses the compound finned tube of steel aluminium simultaneously, can improve equipment's corrosion resistance, the fin interval is 4 ~ 8mm simultaneously, the interval is little, can reduce the circulation sectional area of flue gas, reinforce the heat transfer effect, improve the heat transfer coefficient, reduce equipment size simultaneously, and low in production cost.

Drawings

The present invention will be further described with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a top view of fig. 1.

FIG. 3 is a schematic structural view of the insulation layer.

In the figure, 1 is a closed box body, 2 is a smoke inlet, 3 is a smoke outlet, 4 is a circulating heat exchange pipe, 5 is a liquid inlet, 6 is a liquid outlet, 7 is a heat preservation layer, 8 is a condensed water outlet, 71 is an inner-layer aluminum silicate fiber felt heat preservation layer, 72 is a middle-layer heat-insulating aluminum foil cloth, and 73 is an outer-layer aluminum silicate fiber heat preservation layer.

Detailed Description

As shown in fig. 1, fig. 2 and fig. 3, the utility model relates to a retrieve thermal high-efficient heat transfer device of boiler tail gas, including airtight box 1, airtight box 1 left side is provided with into smoke mouth 2, the right side is provided with outlet 3, inside is provided with circulation heat exchange tube 4, circulation heat exchange tube 4 is the finned tube, circulation heat exchange tube 4 is provided with inlet 5 in airtight box 1 one side, the opposite side is provided with liquid outlet 6, be provided with heat preservation 7 on the box outer wall, heat preservation 7 includes inlayer aluminium silicate fiber felt heat preservation 71, middle level thermal-insulated aluminium foil cloth 72, outer aluminium silicate fiber heat preservation 73, inlayer aluminium silicate fiber heat preservation 71 contacts with airtight box 1 outer wall, inlayer aluminium silicate fiber heat preservation 71 outside is provided with middle level thermal-insulated aluminium foil cloth 72, middle level thermal-insulated aluminium foil cloth 72 outside is provided with outer aluminium silicate fiber heat preservation 73, circulation heat exchange tube 4 is steel aluminium composite finned tube, the interval between the fin of circulation heat exchange tube 4 is 4 358 mm.

When the utility model is used, the boiler tail gas enters the closed box body through the smoke inlet, the cooling water is introduced into the liquid inlet in the circulating heat exchange tube, the high-heat smoke and the cooling water exchange heat when passing through the circulating heat exchange tube, the smoke after heat exchange is discharged into the atmosphere, the cooling water after heat exchange is heated into hot water which is returned to the system water tank or the boiler through the liquid outlet for secondary utilization, the circulating heat exchange tube is a closely-arranged finned tube, the flow section area of the smoke can be effectively reduced, and the heat exchange effect is strengthened, has enough heating surface for the flue gas, can achieve the maximum recovery of the waste heat of the tail gas, can recover the sensible heat and the latent heat in the flue gas to the maximum extent, has the flue gas resistance of not more than 500Pa, can not influence the combustion of a boiler, the heat-insulating layer is arranged outside the box body, so that the heat dissipation loss of the surface can be reduced, the operating cost is improved, the occupied area is reduced, and the economic benefit is improved.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims

1. The utility model provides a retrieve thermal high-efficient heat transfer device of boiler tail gas, includes airtight box (1), its characterized in that: the smoke inlet (2) is arranged on the left side of the closed box body (1), the smoke outlet (3) is arranged on the right side of the closed box body, the circulating heat exchange tube (4) is arranged inside the closed box body, the circulating heat exchange tube (4) is a finned tube, a liquid inlet (5) is formed in one side of the closed box body (1) of the circulating heat exchange tube (4), a liquid outlet (6) is formed in the other side of the closed box body, a heat insulation layer (7) is arranged on the outer wall of the box body, the heat insulation layer (7) comprises an inner-layer aluminum silicate fiber felt heat insulation layer (71), a middle-layer heat insulation aluminum foil cloth (72) and an outer-layer aluminum silicate fiber heat insulation layer (73), the inner-layer aluminum silicate fiber heat insulation layer (71) is in contact with.

2. The efficient heat exchange device for recovering heat of boiler tail gas of claim 1, characterized in that: the circulating heat exchange tube (4) is a steel-aluminum composite finned tube.

3. The high-efficiency heat exchange device for recovering heat of boiler tail gas according to claim 1, characterized in that the spacing between the fins of the circulating heat exchange tube (4) is 4 ~ 8 mm.

4. The efficient heat exchange device for recovering heat of boiler tail gas of claim 1, characterized in that: the closed box body (1) is made of a galvanized plate.

5. The efficient heat exchange device for recovering heat of boiler tail gas of claim 1, characterized in that: and a condensed water outlet (8) is formed in the bottom of the closed box body (1).