Fan for circulating fluidized bed boiler

Abstract

The utility model relates to a fan for circulating fluidized bed boiler, including base and install the air induction cavity on the base, the air induction cavity has a air inlet pipe, be provided with the screen in the air inlet pipe, still be provided with the cleaning assembly for cleaning the screen in the air inlet pipe, the cleaning assembly includes: a rotatable drive shaft, and install the brush plate on the drive shaft, the brush plate has the bristle on the cleaning surface, the bristle pressure touch the screen surface, the filter hole of filter screen can be cleaned when the drive shaft rotates. The utility model realizes depth cleaning through the cooperation of brush plate scraping and screen vibration, the bristle pressure touch screen surface, rotate and scrape and remove the surface and filter hole shallow impurity, reciprocating slide groove and slide rod convert the rotary motion into the high frequency vibration of filter screen, shake off the sticky dust and assist the bristle to dredge the deep filter hole.

Description

Technical Field

[0001] This utility model belongs to the field of fan technology, and specifically relates to a fan for circulating fluidized bed boilers. Background Technology

[0002] Circulating fluidized bed boilers are widely used in power, chemical, and metallurgical industries due to their advantages such as wide fuel adaptability, high combustion efficiency, and easy control of pollutant emissions. They undertake core tasks such as steam supply, heat output, and power generation. In the boiler system, fans are key auxiliary equipment, mainly including primary air fans, secondary air fans, and induced draft fans. The primary air fan is responsible for delivering fluidizing air to the furnace to ensure the bed material is in a good fluidized state. The secondary air fan provides the secondary air required for combustion. The stable operation of both directly determines the boiler's fluidization quality, combustion efficiency, and output stability.

[0003] Since boilers typically operate in industrial plant environments, the air often contains dust, fly ash, fibrous impurities, and particulate pollutants generated during the plant's production process. Therefore, the industry commonly installs filters at the air inlet of fans. Their core function is to intercept solid impurities in the air and ensure the cleanliness of the airflow entering the fan.

[0004] However, boilers are mostly continuous operating systems, and cleaning the fan filter requires shutdown or reduced load operation. In order to avoid affecting production, some companies extend the filter cleaning cycle, which causes impurities to accumulate on the filter surface and gradually form a dense blockage layer, which reduces the air intake. Utility Model Content

[0005] This utility model addresses the problems of existing technologies by providing a blower for circulating fluidized bed boilers. The specific technical solution is as follows:

[0006] A blower for a circulating fluidized bed boiler includes a base and an induced draft chamber installed on the base. The induced draft chamber has an air inlet pipe and a filter screen is installed inside the air inlet pipe.

[0007] The air inlet duct is also equipped with a cleaning component for cleaning the filter screen, the cleaning component including:

[0008] A rotatable drive shaft;

[0009] And a brush plate mounted on a drive shaft, the cleaning surface of the brush plate having bristles that press against the surface of the filter screen;

[0010] The drive shaft can clean and unclog the filter holes of the filter screen when it rotates.

[0011] As a further technical solution of this utility model, the drive shaft is located at the center of the filter screen.

[0012] As a further technical solution of this utility model, the brush plate is located on the air inlet side of the filter screen.

[0013] As a further technical solution of this utility model, the brush plate is provided with an even array of elements and is evenly distributed around the drive shaft.

[0014] As a further technical solution of this utility model, the cleaning component also includes a collar fixedly installed on the filter screen;

[0015] The drive shaft surface is provided with a reciprocating sliding groove;

[0016] The collar is sleeved around the drive shaft, and the inner side of the collar has a slide rod that is slidably connected in the reciprocating slide groove;

[0017] The drive shaft can drive the filter screen to vibrate when it rotates.

[0018] As a further technical solution of this utility model, an output motor is also installed on the base, and the output end of the output motor has an output shaft extending into the air duct cavity, and the drive shaft is coaxially connected to the output shaft.

[0019] The beneficial effects of this utility model are as follows:

[0020] (1) Deep cleaning is achieved through the synergistic effect of brush scraping and filter screen vibration. The brush bristles press against the filter screen surface and rotate to scrape away surface and shallow impurities in the filter holes. The reciprocating slide and slide rod convert the rotational motion into high-frequency vibration of the filter screen, shaking off sticky dust and assisting the brush bristles in unblocking deep filter holes.

[0021] (2) By connecting the drive shaft and the output shaft coaxially, the power of the output motor is used synchronously for air extraction and cleaning. While the output shaft drives the impeller to extract air, the drive shaft drives the brush plate to rotate and triggers the filter screen to vibrate through the reciprocating slide groove-slide bar mechanism, thus realizing "single power source drive dual function". Attached Figure Description

[0022] Figure 1 A schematic diagram of the overall structure of the blower for a circulating fluidized bed boiler is shown.

[0023] Figure 2 A schematic diagram of the cleaning component is shown;

[0024] Figure 3 A schematic diagram of the mating structure of the drive shaft and the collar is shown;

[0025] Figure 4 It shows Figure 2 Schematic diagram of the cross-sectional structure at point AA.

[0026] Legend:

[0027] 100, Base; 200, Air intake chamber; 210, Air inlet pipe; 211, Filter screen; 300, Output motor; 310, Output shaft; 400, Cleaning assembly; 410, Drive shaft; 411, Reciprocating slide; 420, Collar; 421, Slide rod; 430, Brush plate; 431, Brush bristles. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0029] Figure 1 A schematic diagram of the overall structure of the blower for a circulating fluidized bed boiler is shown. Figure 2 A schematic diagram of the cleaning component 400 is shown; Figure 3 A schematic diagram of the mating structure of the drive shaft 410 and the collar 420 is shown; Figure 4 It shows Figure 2 Schematic diagram of the cross-sectional structure at point AA.

[0030] Figure 1 The circulating fluidized bed boiler blower includes a base 100, an induced draft chamber 200 and an output motor 300 mounted on the base 100. The induced draft chamber 200 has an air inlet pipe 210, and the output motor 300 has an output shaft 310 extending into the induced draft chamber 200 at its output end.

[0031] The base 100 serves as the basic load-bearing component of the fan. It is fixed to the ground / boiler auxiliary support by bolts or welding. It bears the weight of the induced draft chamber 200 and the output motor 300, as well as the vibration load generated during operation, to ensure the stability of the overall structure of the fan and prevent the components from shifting due to vibration.

[0032] The air intake chamber 200 is the core chamber for airflow processing. External air enters the air intake chamber 200 through the air inlet pipe 210 to ensure stable airflow delivery.

[0033] When the output motor 300 is powered on, it converts electrical energy into mechanical energy, driving the output shaft 310 to rotate around the axis. The output shaft 310 extends into the air intake chamber 200, providing power for the airflow in the air intake chamber 200, such as driving the impeller to rotate, and providing a power basis for the operation of the subsequent cleaning component 400, without the need for an additional independent power source.

[0034] Figure 2 In the air inlet duct 210, a filter screen 211 and a cleaning component 400 for cleaning the filter screen 211 are installed. The cleaning component 400 includes:

[0035] Rotatable drive shaft 410;

[0036] And a brush plate 430 mounted on a drive shaft 410, the cleaning surface of the brush plate 430 having bristles 431, the bristles 431 pressing against the surface of the filter screen 211; here the cleaning surface refers to the side of the brush plate 430 facing the filter screen 211.

[0037] When the drive shaft 410 rotates, it can clean and unclog the filter holes of the filter screen 211.

[0038] The filter screen 211 is installed inside the air inlet pipe 210. It can intercept dust, particles and other impurities in the airflow entering from the air inlet pipe 210, preventing impurities from entering the boiler and avoiding affecting the boiler's combustion efficiency or damaging the impeller.

[0039] When the drive shaft 410 rotates, it drives the brush plate 430 to make a circular motion. As the bristles 431 press against the surface of the filter screen 211, during the rotation of the brush plate 430, the bristles 431 will "scrape and comb" the impurities on the surface of the filter screen 211 and in the filter holes. The blockage impurities in the filter holes are carried out from the holes by the bristles, thereby clearing the filter holes of the filter screen 211, extending the cycle of manual disassembly and cleaning of the filter screen, and improving the continuous operation efficiency of the fan and boiler.

[0040] It should be noted that the bristles 431 are usually made of nylon or elastic plastic, which are highly soft and can reduce wear on the surface of the filter screen 211.

[0041] See also Figure 2 Combination Figure 4 The drive shaft 410 is located at the center of the filter screen 211, and the brush plate 430 is located on the air inlet side of the filter screen 211. The brush plate 430 is provided with an even number of arrays and is evenly distributed around the drive shaft 410.

[0042] The drive shaft 410 coincides with the axis of the filter screen 211, so that when the brush plate 430 rotates around the drive shaft 410, the rotation radius of each brush plate 430 is the same, that is, the distance from the brush plate 430 to the edge of the filter screen 211 is the same, ensuring that every area of ​​the filter screen 211 from the center to the edge can be covered by the bristles 431, avoiding the problem of "inadequate edge cleaning" caused by the eccentricity of the drive shaft;

[0043] The air inlet side layout of the brush plate 430 means that after the airflow enters from the air inlet pipe 210, it first contacts the brush plate 430 and the bristles 431, and then passes through the filter screen 211. Therefore, impurities can be cleaned as soon as they come into contact with the surface of the filter screen 211, preventing impurities from penetrating into the filter holes due to airflow pressure.

[0044] The brush plate 430 uses an even number of groups, such as 2 or 4 groups, and the included angle between adjacent brush plates is equal, so that the drive shaft 410 is subjected to balanced forces when rotating, and avoids eccentric vibration of the drive shaft due to uneven distribution of brush plates.

[0045] The combination of a central drive shaft and evenly distributed brush plates avoids localized clogging of the filter, ensures uniform airflow, and prevents "airflow deviation" problems caused by localized blockage.

[0046] The cleaning assembly 400 also includes a collar 420 fixedly mounted on the filter screen 211;

[0047] The drive shaft 410 has a reciprocating groove 411 on its surface;

[0048] The collar 420 is sleeved around the drive shaft 410, and the inner side of the collar 420 has a slide rod 421 that is slidably connected in the reciprocating slide groove 411;

[0049] When the drive shaft 410 rotates, it can drive the filter screen 211 to vibrate.

[0050] The collar 420 is fixed to the filter screen 211 by welding or bolts, which is equivalent to the filter screen 211 establishing a "non-rigid connection" with the drive shaft 410 through the collar 420;

[0051] The reciprocating groove 411 on the surface of the drive shaft 410 has a "spiral and folding" structure. When it rotates, the slide rod 421 slides along the groove trajectory in the reciprocating groove 411. Since the collar 420 cannot rotate, the circular motion of the slide rod 421 is converted into "axial reciprocating motion" by the groove trajectory. That is, the collar 420 moves axially back and forth along the drive shaft 410 and drives the filter screen 211 to perform high-frequency axial vibration synchronously. The vibration can shake off the impurities scraped off by the brush bristles 431, and at the same time shake out some stubborn impurities stuck in the filter holes, forming a dual cleaning effect of "scraping and vibration".

[0052] The drive shaft 410 is coaxially connected with the output shaft 310.

[0053] The drive shaft 410 and the output shaft 310 are coaxially connected through a coupling, spline or integral molding to form a synchronous power transmission. When the output shaft 310 rotates, the drive shaft 410 rotates synchronously and at the same speed due to the coaxial relationship. No additional power source is required, the power of the output motor is reused, the independent drive device of the cleaning component is eliminated, and the cost is reduced.

[0054] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A blower for a circulating fluidized bed boiler, comprising a base (100) and an induced draft chamber (200) installed on the base (100), wherein the induced draft chamber (200) has an air inlet pipe (210) and a filter screen (211) is provided inside the air inlet pipe (210); Its features are, The air inlet duct (210) is also provided with a cleaning component (400) for cleaning the filter screen (211), the cleaning component (400) including: A rotatable drive shaft (410); And a brush plate (430) mounted on a drive shaft (410), the brush plate (430) having bristles (431) on its cleaning surface, the bristles (431) pressing against the surface of the filter screen (211); When the drive shaft (410) rotates, it can clean and unclog the filter holes of the filter screen (211).

2. The blower for a circulating fluidized bed boiler according to claim 1, characterized in that: The drive shaft (410) is located at the center of the filter screen (211).

3. The blower for a circulating fluidized bed boiler according to claim 2, characterized in that: The brush plate (430) is located on the air inlet side of the filter (211).

4. The blower for a circulating fluidized bed boiler according to claim 3, characterized in that: The brush plate (430) is provided with an even array of brushes and is evenly distributed around the drive shaft (410).

5. The blower for a circulating fluidized bed boiler according to claim 3, characterized in that: The cleaning assembly (400) also includes a collar (420) fixedly mounted on the filter screen (211); The drive shaft (410) has a reciprocating groove (411) on its surface; The collar (420) is sleeved around the drive shaft (410), and the inner side of the collar (420) has a slide rod (421) that is slidably connected in the reciprocating slide groove (411); When the drive shaft (410) rotates, it can drive the filter screen (211) to vibrate.

6. The blower for a circulating fluidized bed boiler according to claim 3, characterized in that: The base (100) is also equipped with an output motor (300), the output end of which has an output shaft (310) extending into the air duct (200), and the drive shaft (410) is coaxially connected to the output shaft (310).

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