CN210373522U

CN210373522U - Vacuum boiler with flue gas recirculation

Info

Publication number: CN210373522U
Application number: CN201920970001.7U
Authority: CN
Inventors: 汪亚平; 李正斌
Original assignee: Chongqing Taihu Boiler Co ltd
Current assignee: Chongqing Taihu Boiler Co ltd
Priority date: 2019-06-26
Filing date: 2019-06-26
Publication date: 2020-04-21
Anticipated expiration: 2029-06-26

Abstract

The utility model relates to the technical field of vacuum boilers, in particular to a flue gas recirculation vacuum boiler, which comprises a boiler shell barrel, wherein a hearth is arranged in the boiler shell barrel, a burner connected with the hearth is arranged outside the boiler shell barrel, a smoke return chamber connected with the hearth is arranged in the boiler shell barrel, the smoke return chamber is connected with a flue gas pipeline, the flue gas pipeline is connected with a smoke exhaust pipe, the side surface of the smoke exhaust pipe is provided with a flue gas recirculation pipe directly connected with the burner, a baffle is arranged in the smoke exhaust pipe, the pipe orifice of the flue gas recirculation pipe is arranged at the front end of the baffle, the baffle is detachably connected with the smoke exhaust pipe, when the same boiler is used for replacing different technological parameters, the baffles with different sizes can be replaced to adapt to different technological parameters, so that the flue gas recirculation amount can meet the corresponding technological parameters, the temperature is reduced, meanwhile, the full combustion of fuel is not influenced, and the structure is convenient, simple and reliable to manufacture.

Description

Vacuum boiler with flue gas recirculation

Technical Field

The utility model relates to a vacuum boiler technical field, especially a flue gas recirculation's vacuum boiler.

Background

The boiler is an energy conversion device, the energy input to the boiler comprises chemical energy and electric energy in fuel, the boiler outputs steam, high-temperature water or an organic carrier with certain heat energy, the vacuum boiler is a specific mode of the boiler, the vacuum boiler forms a negative-pressure vacuum environment in a closed furnace body, and the inside of the boiler is filled with heat medium water. The heating medium water is heated by combustion or other methods, the heating medium water is heated to generate steam, and the steam realizes the supply of hot water through condensation, heat exchange and water heating in a heat exchanger pipe.

In the existing vacuum boiler, including burner, hearth, smoke returning chamber, smoke channel, smoke exhaust pipe, etc., as shown in fig. 3, the smoke recirculation pipe is generally U-shaped structure 9, the smoke recirculation pipe is partially bent and arranged in the smoke exhaust pipe, the smoke enters the smoke recirculation pipe through the smoke exhaust pipe to cool the burner, etc., in a vacuum boiler, the size of the smoke recirculation pipe and the smoke circulation quantity are both calculated by the reasonable size of the smoke recirculation pipe with the process parameters (such as the proportion of fuel, the size of fire and the temperature to be reached by the boiler), but when the smoke recirculation pipe is applied to different conditions (such as different process parameters), the prior smoke recirculation pipe can not meet the requirement of smoke circulation, the smoke recirculation quantity is increased or reduced, the smoke recirculation quantity is increased to reduce the oxygen content in the hearth, the combustion products can not be fully combusted; the reduction in flue gas recirculation makes the circulating flue gas ineffective in reducing the temperature of the burner, etc.

SUMMERY OF THE UTILITY MODEL

The invention of the utility model aims to: the vacuum boiler with the flue gas recirculation is provided, aiming at the problems that the flue gas recirculation pipe in the vacuum boiler in the prior art can not meet different process parameters, the flue gas recirculation is increased or reduced, the fuel can not be fully combusted or the circulating flue gas can not effectively reduce the temperature of a combustor.

In order to realize the purpose, the utility model discloses a technical scheme be:

the utility model provides a vacuum boiler of flue gas recirculation, includes the shell barrel, be provided with furnace in the shell barrel, shell barrel outside be provided with the combustor that furnace links to each other, be provided with in the shell barrel with the smoke return chamber that furnace links to each other, the smoke return chamber is connected with the flue gas pipeline, the flue gas pipeline links to each other with the pipe of discharging fume, the side of the pipe of discharging fume be provided with directly with the flue gas recirculation pipe that the combustor links to each other, the intraductal baffle that is provided with of discharging fume, the mouth of pipe setting of flue gas recirculation pipe is in the front end of baffle, the baffle with the pipe detachable of discharging fume is connected, here the front end refer to the flue gas when getting into the pipe of discharging fume by the flue gas pipeline, the pipe portion of discharging fume that the flue gas ratio.

As the preferred scheme of the utility model, the flue gas recirculation pipe is L shape structure, the flue gas recirculation pipe sets up the inside of pot shell barrel, the corner of L shape structure is excessive for the circular arc, reduces the resistance of flue gas at the circulation in-process.

As the preferred scheme of the utility model, the flue gas recirculation pipe sets up the mounted position of the last one end of discharging fume is less than the position that the baffle was located refers to the flue gas recirculation pipe highly be less than on the cross section of discharging fume the height of baffle on the cross section of discharging fume the pipe for the flue gas that the baffle kept off down can get into in the flue gas recirculation pipe.

As the preferred scheme of the utility model, the baffle be in the projected area of the cross section of the pipe of discharging fume accounts for 1/4 ~ 1/3 of the pipe cross-sectional area of discharging fume.

As the utility model discloses a preferred scheme, the baffle sets up the below of discharging fume the pipe, the mouth of pipe setting of flue gas recirculation pipe is in the below of discharging fume the pipe, all set up the below of discharging fume the pipe and refer to in the side of the inside below of discharging fume the pipe, the position that baffle and orificial line are parallel with the central axis of the pipe of discharging fume promptly.

As the utility model discloses an optimal scheme, the baffle is the arc structure for the cooperation cross section is the circular shape tub of discharging fume, makes to shelter from partial flue gas discharge, carries out the recirculation of flue gas, carries out the cooling of device.

As the preferred scheme of the utility model, the angle between the plane of the baffle plate and the central axis of the smoke exhaust pipe is 45-90 degrees, and the baffle plate can be arranged to incline close to the direction of the pipe orifice of the smoke recirculation pipe, so that enough smoke can be blocked and discharged into the smoke recirculation pipe when the baffle plate is small; the baffle can also be arranged to incline away from the pipe orifice of the smoke recirculation pipe, and when the baffle is larger, part of smoke under the baffle can be discharged out of the smoke exhaust pipe through the inclined surface.

As the preferred proposal of the utility model, the baffle is fixed on the smoke exhaust pipe through a bolt or the baffle is connected with the smoke exhaust pipe through a buckle.

To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:

1. through having set up detachable baffle in vacuum boiler's exhaust pipe department, keep off down and sink entering flue gas recirculation pipe through the baffle with some flue gas, some flue gas can rush out the pipe of discharging fume through the impact of follow-up flue gas, when different technological parameters are changed to same boiler, the accessible is changed not unidimensional baffle and is adapted to different technological parameters for flue gas recirculation volume can satisfy corresponding technological parameter, do not influence the abundant burning of fuel when reaching the reduce temperature, this structure preparation is convenient, simple and reliable.

Drawings

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

FIG. 2 is a cross-sectional view of the smoke evacuation tube of FIG. 1 taken along line A-A;

FIG. 3 is a schematic view of a U-shaped flue gas recirculation structure in the prior art;

the labels in the figure are: 1-boiler shell cylinder, 2-hearth, 3-burner, 4-smoke returning chamber, 5-flue gas pipeline, 6-smoke exhaust pipe, 7-flue gas recirculation pipe, 8-baffle, 9-U type structure.

Detailed Description

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

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Example 1

As shown in fig. 1 and 2, a vacuum boiler with flue gas recirculation comprises a boiler shell cylinder 1, a hearth 2 is arranged in the boiler shell cylinder 1, a burner 3 connected with the hearth 2 is arranged outside the boiler shell cylinder 1, a smoke return chamber 4 connected with the hearth 2 is arranged in the boiler shell cylinder 1, the smoke return chamber 4 is connected with a smoke pipeline 5, the smoke pipeline 5 is connected with a smoke exhaust pipe 6, the side surface of the smoke exhaust pipe 6 is provided with a smoke recirculation pipe 7 which is directly connected with the burner 3, a baffle plate 8 is arranged in the smoke exhaust pipe 6, the pipe orifice of the smoke recirculation pipe 7 is arranged at the front end of the baffle plate 8, the baffle 8 is detachably connected with the smoke exhaust pipe 6, in the embodiment, the smoke recirculation pipe 7 is welded with the smoke exhaust pipe 6, and the smoke recirculation pipe 7 is communicated with the smoke exhaust pipe 6.

In the present embodiment, as shown in fig. 1, the flue gas recirculation pipe 7 is of an L-shaped structure, and the flue gas recirculation pipe 7 is disposed inside the boiler shell cylinder 1.

In the present embodiment, as shown in fig. 1, one end of the flue gas recirculation pipe 7 disposed on the smoke exhaust pipe 6 is installed at a position lower than that of the baffle plate 8.

As shown in FIG. 2, in the embodiment, the projected area of the baffle 8 on the cross section of the smoke exhaust pipe 6 accounts for 1/4-1/3 of the cross section area of the smoke exhaust pipe 6.

As shown in fig. 1, in this embodiment, the baffle 8 is disposed below the smoke exhaust pipe 6, the mouth of the flue gas recirculation pipe 7 is disposed below the smoke exhaust pipe 6, the baffle 8 is of an arc structure, and an angle between a plane of the baffle 8 and a central axis of the smoke exhaust pipe 6 is 45 ° to 90 °.

In this embodiment, the baffle 8 is fixed on the smoke exhaust pipe 6 through a bolt, and besides this embodiment, the baffle 8 can also be connected with the smoke exhaust pipe 6 through a buckle.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A vacuum boiler with flue gas recirculation is characterized by comprising a boiler shell cylinder (1), a hearth (2) is arranged in the boiler shell cylinder (1), a burner (3) connected with the hearth (2) is arranged outside the boiler shell cylinder (1), a smoke returning chamber (4) connected with the hearth (2) is arranged in the boiler shell cylinder (1), the smoke return chamber (4) is connected with a smoke pipeline (5), the smoke pipeline (5) is connected with a smoke exhaust pipe (6), a smoke recirculation pipe (7) directly connected with the burner (3) is arranged on the side surface of the smoke exhaust pipe (6), a baffle (8) is arranged in the smoke exhaust pipe (6), the pipe opening of the smoke recirculation pipe (7) is arranged at the front end of the baffle (8), and the baffle (8) is detachably connected with the smoke exhaust pipe (6).

2. The flue gas recirculation vacuum boiler according to claim 1, characterized in that the flue gas recirculation pipe (7) is of L-shaped construction, the flue gas recirculation pipe (7) being arranged inside the shell cylinder (1).

3. Vacuum boiler with flue gas recirculation according to claim 1, characterized in that the end of the flue gas recirculation pipe (7) placed on the flue gas exhaust pipe (6) is installed at a lower position than the position where the baffles (8) are located.

4. The flue gas recirculation vacuum boiler according to claim 1, characterized in that the projected area of the baffle (8) in the cross section of the smoke exhaust pipe (6) is 1/4-1/3 of the cross section area of the smoke exhaust pipe (6).

5. Vacuum boiler with flue gas recirculation according to claim 1, characterized in that the baffles (8) are arranged below the flue gas exhaust (6) and the mouth of the flue gas recirculation pipe (7) is arranged below the flue gas exhaust (6).

6. Vacuum boiler with flue gas recirculation according to claim 1, characterized in that the baffles (8) are of arcuate configuration.

7. A flue gas recirculation vacuum boiler according to claim 1, characterized in that the angle between the plane of the baffle (8) and the central axis of the flue gas duct (6) is 45 ° to 90 °.

8. Vacuum boiler with flue gas recirculation according to claim 1, characterized in that the baffle (8) is fixed on the smoke exhaust pipe (6) by bolts or the baffle (8) is connected with the smoke exhaust pipe (6) by snap-fit.