CN211924516U

CN211924516U - Draught fan for boiler of thermal power plant

Info

Publication number: CN211924516U
Application number: CN201922492078.0U
Authority: CN
Inventors: 蒋建强; 邢立搏
Original assignee: Jiangsu Zhongrui Shengda Power Machinery Co ltd
Current assignee: Jiangsu Zhongrui Shengda Power Machinery Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-11-13
Anticipated expiration: 2029-12-31

Abstract

The utility model discloses a draught fan for thermal power factory boiler relates to thermal power factory boiler technical field, easily enters into for solving current draught fan impurity in the use and causes the impeller to damage, and the too high life's that reduces the draught fan problem of flue gas temperature. Be provided with rose box and circulative cooling water tank between bleed pipe and the draught fan, first base is installed to the lower extreme of rose box, one side of rose box lower extreme is provided with row cinder notch, the inside one side of rose box is provided with the metal filter screen, the inside opposite side of rose box is provided with the dust removal fibrous layer, the outside one side of rose box is provided with first intake pipe, the outside opposite side of rose box is provided with first exhaust pipe, first intake pipe passes through flange joint with the bleed pipe.

Description

Draught fan for boiler of thermal power plant

Technical Field

The utility model relates to a thermal power factory boiler technical field specifically is a draught fan for thermal power factory boiler.

Background

The boiler is one of three main machines for generating power in a thermal power plant, has important influence on the efficiency and the reliability of the thermal power plant, and the production equipment of the thermal power plant takes the three main machines of the boiler, a steam turbine and a generator as subjects, so as to improve the production efficiency and the economic profit in the production process, namely, the maximum output power is completed by using the minimum fuel input. Under the requirement of this principle, must add a lot of additional equipment, the main part of boiler body equipment, by "pot" and "stove" two major part constitution respectively, the induced draft fan is the important auxiliary engine of thermal power factory boiler, mainly discharges the high temperature flue gas that burns in the boiler to for the environment of negative pressure is caused in the boiler.

However, impurities in the existing induced draft fan are easy to enter in the using process to cause damage to an impeller, the smoke temperature is too high, the service life of the induced draft fan is shortened, the existing requirements are not met, and the induced draft fan for the boiler of the thermal power plant is provided.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a draught fan for thermal power factory boiler to the current draught fan that proposes in solving above-mentioned background art easily enters into impurity in the use and causes the impeller to damage, and the flue gas temperature too high problem that reduces the life of draught fan.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a draught fan for thermal power factory boiler, includes bleed pipe and draught fan, be provided with rose box and circulative cooling water tank between bleed pipe and the draught fan, first base is installed to the lower extreme of rose box, one side of rose box lower extreme is provided with row cinder notch, one side of rose box inside is provided with the metal filter screen, the inside opposite side of rose box is provided with the dust removal fibrous layer, the outside one side of rose box is provided with first intake pipe, the outside opposite side of rose box is provided with first exhaust pipe, first intake pipe passes through flange joint with the bleed pipe.

Preferably, one side of the outside of the circulating cooling water tank is provided with a second air inlet pipe, the second air inlet pipe is connected with the first exhaust pipe through a flange, the other side of the outside of the circulating cooling water tank is provided with a second exhaust pipe, and the inside of the circulating cooling water tank is provided with a heat exchange coil pipe.

Preferably, the induced draft case is installed to one side of draught fan, the internally mounted of induced draft case has the impeller, the outside of induced draft case is provided with the third intake pipe, the upper end of induced draft case is provided with the third blast pipe, motor reducer is installed to one side of induced draft case, and installs the bearing box between motor reducer and the induced draft case, the second base is installed to the lower extreme of draught fan, and the second blast pipe passes through flange joint with the third intake pipe.

Preferably, the circulating cooling water tank is provided with a heat-insulating layer outside, and the heat-insulating layer is connected with the circulating cooling water tank in a cementing manner.

Preferably, a gas pressure gauge is mounted outside the second air inlet pipe.

Preferably, the metal filter screen and the dust removal fiber layer are connected with the filter box through clamping grooves.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses an install the rose box between bleed pipe and draught fan and come inside large granule impurity and the dust of filtering high temperature flue gas, avoid impurity to get into the bleed case and cause the impeller to damage, the impurity of filtering can in time get rid of through the scum hole, avoids rose box impurity to pile up, can monitor first blast pipe's pressure load through the barometer to judge the degree of blocking up of dust removal fibrous layer, be convenient for in time change.

2. The utility model discloses a built-in cooling water of recirculated cooling water tank fully contacts with heat exchange coil, when the high temperature flue gas passes through heat exchange coil, takes place heat exchange with the cooling water to carry out rapid cooling to the high temperature flue gas, make the flue gas temperature reduce by a wide margin, avoid causing the damage to parts such as motor and bearing, prolong the life of draught fan.

Drawings

Fig. 1 is a schematic view of the overall structure of an induced draft fan for a boiler of a thermal power plant according to the present invention;

FIG. 2 is a partial enlarged view of region A of the present invention;

fig. 3 is a schematic structural diagram of the heat exchange coil of the present invention.

In the figure: 1. a bleed pipe; 2. an induced draft fan; 3. a filter box; 4. a circulating cooling water tank; 5. a first base; 6. a slag discharge port; 7. a metal screen; 8. a dust removal fiber layer; 9. a first intake pipe; 10. a first exhaust pipe; 11. a second intake pipe; 12. a second exhaust pipe; 13. a heat exchange coil; 14. an air introduction tank; 15. a third intake pipe; 16. an impeller; 17. a motor reducer; 18. a third exhaust pipe; 19. a heat-insulating layer; 20. a second base; 21. a barometer.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1-3, the present invention provides an embodiment: a draught fan for a boiler of a thermal power plant comprises an air entraining pipe 1 and a draught fan 2, a filter box 3 and a circulating cooling water tank 4 are arranged between the air entraining pipe 1 and the draught fan 2, a first base 5 is arranged at the lower end of the filter box 3, a slag discharge port 6 is arranged at one side of the lower end of the filter box 3, a metal filter screen 7 is arranged at one side inside the filter box 3, a dedusting fiber layer 8 is arranged at the other side inside the filter box 3, a first air inlet pipe 9 is arranged at one side outside the filter box 3, a first exhaust pipe 10 is arranged at the other side outside the filter box 3, the first air inlet pipe 9 is connected with the air entraining pipe 1 through a flange, high-temperature flue gas enters the inside of the filter box 3 through the air entraining pipe 1, and the dust is discharged out of the box in time through a slag discharge port 6, and then the dust in the high-temperature flue gas is removed through a dust removal fiber layer 8.

Further, one side of the outside of the circulating cooling water tank 4 is provided with a second air inlet pipe 11, the second air inlet pipe 11 is connected with the first exhaust pipe 10 through a flange, the other side of the outside of the circulating cooling water tank 4 is provided with a second exhaust pipe 12, the inside of the circulating cooling water tank 4 is provided with a heat exchange coil 13, high-temperature flue gas enters the heat exchange coil 13, the high-temperature flue gas is fully contacted with cooling water in the circulating cooling water tank 4, heat exchange occurs, and therefore the temperature of the high-temperature flue gas is reduced.

Further, an induced draft box 14 is installed on one side of the induced draft fan 2, an impeller 16 is installed inside the induced draft box 14, a third air inlet pipe 15 is arranged on the outer side of the induced draft box 14, a third exhaust pipe 18 is arranged at the upper end of the induced draft box 14, a motor speed reducer 17 is installed on one side of the induced draft box 14, a bearing box is installed between the motor speed reducer 17 and the induced draft box 14, a second base 20 is installed at the lower end of the induced draft fan 2, the second exhaust pipe 12 is connected with the third air inlet pipe 15 through a flange, the speed of the motor speed reducer 17 can be adjusted, the impeller 16 is driven to rotate at a high speed by the operation of the motor speed reducer 17.

Further, the outside of recirculated cooling water tank 4 is provided with heat preservation 19, and heat preservation 19 is connected with recirculated cooling water tank 4 cementing, better realization waste heat recovery.

Further, the outside of second intake pipe 11 is installed with barometer 21, and barometer 21 can monitor the pressure load of first exhaust pipe 10 to judge the jam degree of dust removal fibrous layer 8, be convenient for in time change dust removal fibrous layer 8.

Further, metal filter screen 7 and dust removal fibrous layer 8 all are connected through the draw-in groove with rose box 3, and the installation is simple and convenient with the dismantlement.

The working principle is as follows: when the device is used, the induced draft fan 2 works, high-temperature flue gas enters the inside of the filter box 3 through the gas guide pipe 1, the metal filter screen 7 filters large-particle impurities in the high-temperature flue gas and is discharged out of the box in time through the slag discharge port 6, then dust in the high-temperature flue gas is removed through the dedusting fiber layer 8, the filtered flue gas enters the circulating cooling water tank 4 and enters the heat exchange coil 13 to be fully contacted with cooling water in the circulating cooling water tank 4 to generate heat exchange, so that the temperature of the high-temperature flue gas is reduced, the cooled flue gas enters the inside of the gas guide box 14 and is finally discharged to the outside through the third exhaust pipe 18, the flue gas entering the induced draft fan 2 is low-temperature flue gas without impurities, the induced draft fan 2 cannot be damaged, the service life of the induced draft fan 2 is prolonged, the barometer 21 can monitor the pressure load of the first exhaust pipe 10, so as to judge the, the dedusting fiber layer 8 can be replaced in time.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a draught fan for thermal power factory boiler, includes bleed pipe (1) and draught fan (2), its characterized in that: be provided with rose box (3) and recirculated cooling water tank (4) between bleed pipe (1) and draught fan (2), first base (5) are installed to the lower extreme of rose box (3), one side of rose box (3) lower extreme is provided with row cinder notch (6), the inside one side of rose box (3) is provided with metal filter screen (7), the inside opposite side of rose box (3) is provided with dust removal fibrous layer (8), the outside one side of rose box (3) is provided with first intake pipe (9), the outside opposite side of rose box (3) is provided with first exhaust pipe (10), first intake pipe (9) pass through flange joint with bleed pipe (1).

2. The induced draft fan for the boiler of the thermal power plant according to claim 1, wherein: the utility model discloses a circulating cooling water tank, including recirculated cooling water tank (4), second intake pipe (11) are provided with to the outside one side of recirculated cooling water tank (4), and second intake pipe (11) pass through flange joint with first blast pipe (10), the outside opposite side of recirculated cooling water tank (4) is provided with second blast pipe (12), the internally mounted of recirculated cooling water tank (4) has heat exchange coil (13).

3. The induced draft fan for the boiler of the thermal power plant according to claim 1, wherein: induced draft case (14) are installed to one side of draught fan (2), the internally mounted of induced draft case (14) has impeller (16), the outside of induced draft case (14) is provided with third admission pipe (15), the upper end of induced draft case (14) is provided with third blast pipe (18), motor reducer (17) is installed to one side of induced draft case (14), and installs the bearing box between motor reducer (17) and induced draft case (14), second base (20) are installed to the lower extreme of draught fan (2), and second blast pipe (12) pass through flange joint with third admission pipe (15).

4. The induced draft fan for the boiler of the thermal power plant according to claim 1, wherein: and a heat insulation layer (19) is arranged outside the circulating cooling water tank (4), and the heat insulation layer (19) is connected with the circulating cooling water tank (4) in a gluing manner.

5. The induced draft fan for the boiler of the thermal power plant according to claim 2, wherein: and a gas pressure gauge (21) is mounted outside the second air inlet pipe (11).

6. The induced draft fan for the boiler of the thermal power plant according to claim 1, wherein: the metal filter screen (7) and the dust removal fiber layer (8) are connected with the filter box (3) through clamping grooves.