Fan system for reducing energy consumption during low-load operation of boiler

Abstract

The utility model discloses a fan system for reducing energy consumption during low-load operation of a boiler, which relates to the technical field of boilers and comprises a first fan and a second fan, a first pipeline is communicated between the first fan and a combustion chamber of the boiler, a second pipeline is communicated between the second fan and the combustion chamber of the boiler, and the first pipeline is communicated with the second pipeline. The first pipeline is communicated with a primary tuyere of the boiler, and the second pipeline is communicated with a secondary tuyere of the boiler; one end of the third pipeline is communicated with the first pipeline, the other end of the third pipeline is communicated with the second pipeline, and the second pipeline is divided into an upstream section close to the second fan and a downstream section close to a combustion chamber of the boiler by taking the third pipeline as a boundary; the flow direction of the air in the first pipeline is changed through the baffle, so that when the boiler operates at a low load, a worker does not need to adjust the gears of the first fan and the second fan respectively, and only needs to close the second fan, and therefore, the working convenience of the worker can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of boilers, in particular to a fan system for reducing energy consumption of a boiler when it is running at low load. Background Art

[0002] The main task of the blower is to provide the boiler with the air required for combustion. It draws in fresh air from the outside and sends it into the boiler furnace after pressurization. In a pulverized coal boiler, the primary air and secondary air are usually provided by independent fans, that is, there is one primary fan and one secondary fan.

[0003] The primary fan provides fluidizing air for the bed, enabling the solid fuel particles to burn in a fluidized state. It transports air to the bottom of the fuel bed. The reasonable delivery of secondary air is also critical. It usually enters the furnace after the fuel has begun to burn, and delivers air through specific air vents and angles to enhance the disturbance during the combustion process, making the flame more stable and avoiding unstable phenomena such as flame fluttering and extinction.

[0004] In the prior art, when the boiler is running at low load, the primary fan and the secondary fan need to be adjusted separately to ensure normal combustion of the fuel inside the boiler and reduce the energy consumption of the fan system. However, it is relatively cumbersome to adjust the gears of the primary fan and the secondary fan separately. Utility Model Content

[0005] The purpose of the utility model is to provide a fan system which reduces the energy consumption of a boiler when the boiler is running at low load, so as to solve the above-mentioned deficiencies in the prior art.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a fan system for reducing energy consumption during low-load operation of a boiler, comprising a first fan and a second fan, wherein a first pipe is provided between the first fan and a combustion chamber of the boiler, and a second pipe is provided between the second fan and the combustion chamber of the boiler, the first pipe being connected to a primary air inlet of the boiler, and the second pipe being connected to a secondary air inlet of the boiler; and further comprising a third pipe and a baffle, wherein one end of the third pipe is connected to the first pipe and the other end is connected to the second pipe, and the second pipe is divided into an upstream section near the second fan and a downstream section near the combustion chamber of the boiler by the third pipe; the baffle is rotatably connected within the second pipe, and during its rotational travel, the baffle has: a first position in which only the third pipe is closed, and a second position in which only the upstream section of the second pipe is closed; when both the first and second fans are in operation, airflow fed into the second pipe by the second fan causes the baffle to be positioned in the first position; when only the first fan is in operation, airflow fed into the first pipe by the first fan is diverted through the third pipe, causing the baffle to be positioned in the second position, and airflow in the third pipe enters the downstream section of the second pipe.

[0007] Furthermore, it also includes an elastic member, which drives the baffle to switch from the first position to the second position during the process of restoring the deformation of the elastic member.

[0008] Furthermore, a rotating shaft is fixedly connected to the baffle, and the rotating shaft is rotatably connected to the second pipe. The elastic member includes a clockwork spring, one end of the clockwork spring is fixedly connected to the second pipe, and the other end of the clockwork spring is fixedly connected to the rotating shaft.

[0009] Furthermore, a plurality of partitions are provided in the third pipe.

[0010] Furthermore, the third pipeline is fixedly connected to the first pipeline and the second pipeline through two sets of flanges respectively.

[0011] Furthermore, a sealing ring is provided on the baffle.

[0012] Compared with the prior art, the present invention provides a fan system that reduces energy consumption when the boiler is running at low load. When the boiler is running at low load, the second fan is turned off while the first fan is running normally. The air outlet of the first fan blows air toward the first pipe, and the air in the first pipe enters the third pipe. After passing through the third pipe, the air blows the baffle so that the baffle is in the second position, and the air in the third pipe enters the second pipe. In this way, part of the air in the first pipe enters the first air outlet of the boiler, and the other part of the air in the first pipe enters the second air outlet of the boiler through the second pipe, thereby reducing the energy consumption of the fan system when the boiler is running at low load.

[0013] By changing the flow direction of the air in the first pipe by the baffle, when the boiler is running at low load, the worker does not need to adjust the gears of the first fan and the second fan respectively, but only needs to turn off the second fan, which can improve the convenience of the worker's work. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0015] Figure 1 A schematic structural diagram of a fan system provided in an embodiment of the present utility model;

[0016] Figure 2 A schematic diagram of the structures of the first pipeline, the second pipeline and the third pipeline provided in an embodiment of the present utility model;

[0017] Figure 3 A schematic diagram of the wind flow direction structure when only the first fan is turned on according to an embodiment of the present invention;

[0018] Figure 4 This is a schematic diagram of the wind flow direction structure in which both the first fan and the second fan are turned on, provided in an embodiment of the present utility model.

[0019] Description of reference numerals:

[0020] 1. First fan; 2. Second fan; 3. First pipeline; 4. Second pipeline; 5. Third pipeline; 51. Partition; 52. Flange; 6. Baffle; 61. Rotating shaft. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] See also Figure 1-4 The embodiment of the present invention provides a fan system for reducing energy consumption when a boiler is running at low load, comprising a first fan 1 and a second fan 2. A first pipe 3 is provided between the first fan 1 and the combustion chamber of the boiler, a second pipe 4 is provided between the second fan 2 and the combustion chamber of the boiler, the first pipe 3 is connected to the primary air outlet of the boiler, and the second pipe 4 is connected to the secondary air outlet of the boiler; the system also comprises a third pipe 5 and a baffle 6, one end of the third pipe 5 is connected to the first pipe 3, and the other end is connected to the second pipe 4, and the second pipe 4 is separated by the third pipe 5 as a boundary to be close to the second fan 2 the upstream section of the combustion chamber near the boiler; the baffle 6 is rotatably connected in the second pipe 4, and the baffle 6 has, in its rotation stroke,: a first position that only closes the third pipe 5, and a second position that only closes the upstream section of the second pipe 4; when the first fan 1 and the second fan 2 are both running, the airflow sent into the second pipe 4 by the second fan 2 causes the baffle 6 to be located in the first position; when only the first fan 1 is running, the airflow sent into the first pipe 3 by the first fan 1 is diverted through the third pipe 5, causing the baffle 6 to be located in the second position, and the airflow in the third pipe 5 enters the downstream section of the second pipe 4.

[0023] When the boiler is running at low load, the second fan 2 is turned off while the first fan 1 is running normally. The air outlet of the first fan 1 blows air to the first pipe 3, and the air in the first pipe 3 enters the third pipe 5. After passing through the third pipe 5, the wind will blow the baffle 6 so that the baffle 6 can be in the second position, and the air from the third pipe 5 can enter the second pipe 4. In this way, part of the air from the first pipe 3 enters the first air port of the boiler, and the other part of the air from the first pipe 3 enters the second air port of the boiler through the second pipe 4, thereby reducing the energy consumption of the fan system when the boiler is running at low load. When the boiler is at high load, both the first fan 1 and the second fan 2 are turned on, and the first fan 1 blows air to the first pipe 3. Blowing, part of the wind in the first pipe 3 will enter the third pipe 5, and the wind force diverted to the third pipe 5 is less than the wind blown by the second fan 2 to the second pipe 4. At this time, the baffle 6 will switch from the second position to the first position. Thereafter, the wind blown by the first fan 1 enters the primary air inlet of the boiler, and the wind blown by the second fan 2 enters the secondary air inlet of the boiler, ensuring high-load operation of the boiler. It is worth mentioning that the diameter of the first pipe 3 and the diameter of the second pipe 4 here are both larger than the diameter of the third pipe 5. When the baffle 6 is in the second position, a small part of the wind blown by the first fan 1 will be diverted to the third pipe 5 and then into the second pipe 4, and most of the wind blown by the first fan 1 enters the primary air inlet along the first pipe 3.

[0024] Compared with the prior art, the present invention provides a fan system that reduces energy consumption when the boiler is running at low load. The baffle 6 changes the flow direction of the wind in the first pipe 3, so that when the boiler is running at low load, the worker does not need to adjust the gears of the first fan 1 and the second fan 2 respectively, but only needs to turn off the second fan 2, which can improve the convenience of the worker's work.

[0025] As the preferred technical solution of the present invention, it also includes an elastic member, which drives the baffle 6 to switch from the first position to the second position during the recovery of the deformation of the elastic member. Specifically, a rotating shaft 61 is fixedly connected to the plate, and the rotating shaft 61 is rotatably connected to the second pipe 4. The elastic member includes a clockwork spring (the clockwork spring is a prior art and is not shown in the figure). One end of the clockwork spring is fixedly connected to the second, and the other end of the clockwork spring is fixedly connected to the rotating shaft 61. The wind blown out by the second fan 2 is sufficient to enable the baffle 6 to overcome the force of the clockwork spring and the wind force of the third pipe 5. When the second fan 2 is not working, the clockwork spring can make the baffle 6 be in the second position, so that the wind in the third pipe 5 can be easily diverted into the second pipe 4.

[0026] Among them, the third pipeline 5 is fixedly connected to the first pipeline 3 and the second pipeline 4 through two sets of flanges 52 respectively. Installing the third pipeline 5 through the flanges 52 makes the connection between the third pipeline 5 and the first pipeline 3 and the second pipeline 4 more secure, and the third pipeline 5 can also be disassembled.

[0027] In another technical solution provided by the present invention, multiple partitions 51 are arranged in the third pipe 5. The multiple partitions 51 can reduce the blowing force of the wind diverted into the third pipe 5, and prevent the wind diverted into the third pipe 5 from blowing the baffle 6 with a large force, so as to prevent the baffle 6 from being unable to switch from the second work station to the first work station after the second fan 2 is turned on.

[0028] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A fan system for reducing energy consumption when a boiler is running at low load, comprising a first fan (1) and a second fan (2), wherein a first pipe (3) is provided between the first fan (1) and a combustion chamber of the boiler, a second pipe (4) is provided between the second fan (2) and the combustion chamber of the boiler, the first pipe (3) is connected to a primary air inlet of the boiler, and the second pipe (4) is connected to a secondary air inlet of the boiler, and is characterized in that: It also includes a third pipe (5) and a baffle (6), one end of the third pipe (5) is connected to the first pipe (3), and the other end is connected to the second pipe (4), and the second pipe (4) is divided into an upstream section close to the second fan (2) and a downstream section close to the combustion chamber of the boiler by the third pipe (5); The baffle (6) is rotatably connected in the second pipe (4), and the baffle (6) has a first position in its rotational stroke, which only closes the third pipe (5), and a second position, which only closes the upstream section of the second pipe (4); when both the first fan (1) and the second fan (2) are running, the airflow sent into the second pipe (4) by the second fan (2) causes the baffle (6) to be located in the first position; When only the first fan (1) is running, the airflow sent into the first pipe (3) by the first fan (1) is diverted through the third pipe (5) so that the baffle (6) is located at the second position, and the airflow in the third pipe (5) enters the downstream section of the second pipe (4).

2. A fan system for reducing energy consumption during low-load operation of a boiler according to claim 1, characterized in that: It also includes an elastic member, which drives the baffle (6) to switch from the first working position to the second working position during the process of restoring the deformation of the elastic member.

3. A fan system for reducing energy consumption during low-load operation of a boiler according to claim 2, characterized in that: A rotating shaft (61) is fixedly connected to the baffle (6), and the rotating shaft (61) is rotatably connected to the second pipe (4). The elastic member comprises a spring, one end of which is fixedly connected to the second pipe (4), and the other end of which is fixedly connected to the rotating shaft (61).

4. The fan system for reducing energy consumption during low-load operation of a boiler according to claim 1, characterized in that: A plurality of partitions (51) are provided in the third pipe (5).

5. The fan system for reducing energy consumption during low-load operation of a boiler according to claim 1, characterized in that: The third pipeline (5) is fixedly connected to the first pipeline (3) and the second pipeline (4) respectively through two sets of flanges (52).

6. The fan system for reducing energy consumption during low-load operation of a boiler according to claim 1, characterized in that: A sealing ring is provided on the baffle (6).

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