CN211372478U

CN211372478U - Air preheating energy-saving device of boiler

Info

Publication number: CN211372478U
Application number: CN201922489973.7U
Authority: CN
Inventors: 王凌杰
Original assignee: Huzhou South Taihu Electric Power Technology Co ltd
Current assignee: Huzhou South Taihu Electric Power Technology Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-08-28
Anticipated expiration: 2029-12-31

Abstract

The utility model discloses an air preheating energy-saving device of a boiler, which comprises an air inlet duct (2) and a smoke exhaust channel (3) which are respectively connected with a hearth (1) of the boiler, wherein the smoke exhaust channel (3) is connected with a first smoke outlet pipe (32) and a second smoke outlet pipe (33) through a separator (31), the air inlet duct (2) is provided with a first heat exchanger (21) communicated with the first smoke outlet pipe (32), the first heat exchanger (21) is internally provided with a spiral upwards extending heat exchange pipe (22), and the end of the air inlet duct (2) is connected with the bottom of the hearth (1); a branch air pipe (41) is arranged between the first heat exchanger (21) and the hearth (1) on the air inlet duct (2), a second heat exchanger (42) communicated with the second smoke outlet pipe (33) is arranged on the branch air pipe (41), and the tail end of the branch air pipe (41) is connected with the side part of the hearth (1). The utility model has the characteristics of heat exchange efficiency is high, get into furnace's air temperature height, energy-conservation nature is good.

Description

Air preheating energy-saving device of boiler

Technical Field

The utility model relates to an economizer of boiler, especially an air preheating economizer of boiler.

Background

In the prior art, because the temperature of the flue gas discharged by the boiler is higher, the air of the boiler is usually preheated by exchanging heat with the flue gas before entering a hearth, and then the preheated air directly enters the hearth for auxiliary combustion. Such air preheating mode, flue only adopt once to preheat to the wind channel, and the heat transfer mode is fairly simple, and heat exchange efficiency is not high, and the effect is general, and the air temperature in the wind channel after preheating like this is still not high, gets into the increase that still can lead to the energy consumption in the furnace, and is not enough energy-conserving, causes the exhaust gas temperature of flue high simultaneously, also does not do benefit to gas cleaning device safety work yet. Therefore, the air preheating of the existing boiler has the problems of low heat exchange efficiency, low temperature of air entering a hearth and unsatisfactory energy conservation.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an air preheating economizer of boiler. The utility model has the characteristics of heat exchange efficiency is high, get into furnace's air temperature height, energy-conservation nature is good.

The technical scheme of the utility model: the air preheating energy-saving device of the boiler comprises an air inlet duct and a smoke exhaust channel which are respectively connected with a hearth of the boiler, wherein the smoke exhaust channel is connected with a first smoke outlet pipe and a second smoke outlet pipe through a separator; and a branch air pipe is arranged on the air inlet duct and positioned between the first heat exchanger and the hearth, a second heat exchanger communicated with the second smoke outlet pipe is arranged on the branch air pipe, and the tail end of the branch air pipe is connected with the side part of the hearth.

In the air preheating energy-saving device of the boiler, the four peripheral corners inside the first heat exchanger are respectively provided with the heat insulation blocks, and the side surfaces of the heat insulation blocks facing the heat exchange tubes are arc-shaped surfaces.

In the air preheating energy-saving device of the boiler, the top of the heat exchange tube is provided with a plurality of vertical heat conducting blocks, and the side surface of the heat exchange tube is provided with heat conducting fins which are distributed obliquely and downwards.

In the air preheating energy-saving device of the boiler, the second heat exchanger is vertically provided with a plurality of branch pipes connected with inlets of the branch air pipes, each branch pipe is provided with a plurality of bulges along the length direction, and outlets of the branch pipes are connected with outlet ends of the branch air pipes through the air collecting cover.

Compared with the prior art, because the flue gas discharged from the boiler has higher temperature, after being separated by the separator, smaller particles are discharged through the first smoke outlet pipe, and bigger particles are reintroduced into the hearth through the second smoke outlet pipe, the utility model secondarily preheats the air inlet duct, firstly carries out heat exchange treatment on the air inlet duct and the first smoke outlet pipe through the first heat exchanger, the heat exchange tube in the first heat exchanger extends upwards in a spiral shape, the air in the heat exchange tube flows upwards from the bottom, the flow speed is lower, the contact area with the first smoke outlet pipe is large, the heat exchange efficiency is high, then a part of preheated air enters the hearth from the bottom, the other part of air carries out secondary heat exchange treatment through the branch air tube and the second heat exchanger, the air after heat exchange enters from the side wall of the hearth, the heat in the smoke exhaust passage can be fully utilized, the secondary heat exchange treatment is carried out, the air inlet temperature is improved, the heat loss of fuel is reduced, the cost is saved, the energy saving performance is good, and the combustion efficiency of the boiler is improved.

Therefore, the utility model has the characteristics of heat exchange efficiency is high, get into furnace's air temperature height, energy-conservation nature is good.

Drawings

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

FIG. 2 is a schematic structural view of a first heat exchanger;

fig. 3 is a schematic structural view of the second heat exchanger.

The labels in the figures are: 1. a hearth; 2. an air inlet duct; 21. a first heat exchanger; 22. a heat exchange pipe; 23. a heat insulation block; 24. a heat conducting block; 25. a heat conductive fin; 3. a smoke evacuation channel; 31. a separator; 32. a first smoke outlet pipe; 33. a second smoke outlet pipe; 41. a branch air pipe; 42. a second heat exchanger; 43. pipe distribution; 44. bulging; 45. an air collecting cover.

Detailed Description

The following description is made with reference to the accompanying drawings and examples, but not to be construed as limiting the invention.

Examples are given.

As shown in fig. 1-3, the air preheating energy-saving device of a boiler comprises an air inlet duct 2 and a smoke exhaust channel 3 respectively connected with a hearth 1 of the boiler, wherein the smoke exhaust channel 3 is connected with a first smoke outlet pipe 32 and a second smoke outlet pipe 33 through a separator 31, the tail end of the second smoke outlet pipe 33 is connected with the hearth 1, the air inlet duct 2 is provided with a first heat exchanger 21 communicated with the first smoke outlet pipe 32, the first heat exchanger 21 is internally provided with a heat exchange pipe 22 which extends upwards in a spiral shape, the lower end of the heat exchange pipe 22 is connected with an inlet of the air inlet duct 2, the upper end of the heat exchange pipe 22 is connected with an outlet of the air inlet duct 2, and the tail end of the air inlet duct 2 is connected with the bottom of; a branch air duct 41 is arranged between the first heat exchanger 21 and the hearth 1 on the air inlet duct 2, a second heat exchanger 42 communicated with the second smoke outlet pipe 33 is arranged on the branch air duct 41, and the tail end of the branch air duct 41 is connected with the side part of the hearth 1.

The four peripheral corners in the first heat exchanger 21 are all provided with heat insulation blocks 23, and the side surfaces of the heat insulation blocks 23 facing the heat exchange tubes 22 are arc-shaped surfaces.

The top of the heat exchange tube 22 is provided with a plurality of vertical heat conducting blocks 24, and the side surface of the heat exchange tube 22 is provided with heat conducting fins 25 which are distributed obliquely downwards.

A plurality of branch pipes 43 connected with inlets of the branch pipes 41 are vertically arranged in the second heat exchanger 42, a plurality of bulges 44 are arranged on each branch pipe 43 along the length direction, and outlets of the branch pipes 43 are connected with outlet ends of the branch pipes 41 through air collecting hoods 45.

Because the flue gas discharged from the boiler has higher temperature, after being separated by the separator 31, smaller particles are discharged through the first smoke outlet pipe 32, and thicker particles are reintroduced into the hearth 1 through the second smoke outlet pipe 33, the utility model discloses carry out the secondary preheating on the air inlet duct 2, firstly carry out heat exchange treatment on the air inlet duct 2 through the first heat exchanger 21 and the first smoke outlet pipe 32, increase the heat insulating block 23 on the peripheral corner part in the first heat exchanger 21, improve the protection on the corner part of the first heat exchanger 21, avoid heat and deformation concentration, and prolong the service life of the first heat exchanger 21; the arc-shaped surface of the heat insulation block 23 is arranged, so that smoke dust can be conveniently led out, and the situation that the smoke dust is accumulated at the corner of the heat exchanger to generate dirt and influence heat exchange is avoided; the heat exchange tube 22 in the first heat exchanger 21 extends upwards in a spiral shape, the wind speed in the heat exchange tube 22 flows from bottom to top, the flow speed is low, the contact area with the first smoke outlet tube 32 is large, and the heat exchange efficiency is high; the heat conduction block 24 that sets up not only plays the effect that improves heat exchange efficiency, and with the smoke and dust reposition of redundant personnel, the heat transfer is more even, and the air current noise reduction, the heat conduction fin 25 of setting further improves heat exchange efficiency, and the slope sets up in addition, still plays the effect of water conservancy diversion, the water film that forms in the heat exchange tube 22 outside during can effectual elimination flue gas condensation for the smoke and dust flows downwards smoothly, reduces the remaining smoke and dust in first heat exchanger 21. Then, a part of preheated air enters the hearth 1 from the bottom, the other part of preheated air is subjected to heat exchange treatment again through the branch air pipe 41 and the second heat exchanger 42 and the second smoke outlet pipe 33, the air in the branch air pipe 41 in the second heat exchanger 42 is divided one by one through the branch pipes 43, the contact area between the air and the second smoke outlet pipe 33 is increased, the heat exchange effect is improved, the arranged bulge 44 can slow down the flow velocity of airflow in the branch pipes 43, the heat exchange time is prolonged, the airflow flowing noise is reduced, and the airflow is concentrated through the air collecting cover 45, so that the heat loss is reduced. The air after heat exchange enters from the side wall of the hearth 1, the heat in the smoke exhaust channel 3 is fully utilized, the air inlet temperature is improved, the heat loss of fuel is reduced, the energy is saved, and the combustion efficiency of the boiler is improved.

Claims

1. The air of boiler preheats economizer, including air inlet duct (2) and smoke exhaust passage (3) be connected with furnace (1) of boiler respectively, smoke exhaust passage (3) are connected with first play tobacco pipe (32) and second play tobacco pipe (33) through separator (31), and the end and furnace (1) of second play tobacco pipe (33) are connected its characterized in that: the air inlet duct (2) is provided with a first heat exchanger (21) communicated with the first smoke outlet pipe (32), a heat exchange pipe (22) which extends upwards in a spiral manner is arranged in the first heat exchanger (21), the lower end of the heat exchange pipe (22) is connected with an inlet of the air inlet duct (2), the upper end of the heat exchange pipe (22) is connected with an outlet of the air inlet duct (2), and the tail end of the air inlet duct (2) is connected with the bottom of the hearth (1); a branch air pipe (41) is arranged between the first heat exchanger (21) and the hearth (1) on the air inlet duct (2), a second heat exchanger (42) communicated with the second smoke outlet pipe (33) is arranged on the branch air pipe (41), and the tail end of the branch air pipe (41) is connected with the side part of the hearth (1).

2. The air preheating energy-saving device of the boiler according to claim 1, characterized in that: all be equipped with thermal-insulated piece (23) on four inside peripheral angles of first heat exchanger (21), thermal-insulated piece (23) are the arcwall face towards the side of heat exchange tube (22).

3. The air preheating energy-saving device of the boiler according to claim 1, characterized in that: the top of the heat exchange tube (22) is provided with a plurality of vertical heat conducting blocks (24), and the side surface of the heat exchange tube (22) is provided with heat conducting fins (25) which are distributed obliquely and downwards.

4. The air preheating energy-saving device of the boiler according to claim 1, characterized in that: a plurality of branch pipes (43) connected with inlets of the branch air pipes (41) are vertically arranged in the second heat exchanger (42), a plurality of bulges (44) are arranged on each branch pipe (43) along the length direction, and outlets of the branch pipes (43) are connected with outlet ends of the branch air pipes (41) through air collecting covers (45).