Integrated anti-blocking type step-by-step dynamic and static separation equipment for coarse powder and fine powder of biomass powder

Abstract

The embodiment of the invention provides integrated anti-blocking type biomass powder coarse and fine powder step-by-step dynamic and static separation equipment which comprises a first-stage coarse powder cyclone separation device, a second-stage coarse powder cyclone separation device, a second-stage coarse powder cyclone separation device and a third-stage cyclone separation device, the first-stage coarse powder cyclone separation device comprises a first-stage cyclone barrel, and the first-stage cyclone barrel is provided with a first exhaust gas outlet, a coarse powder outlet and an air powder inlet; the first-stage coarse powder cyclone separation device further comprises a first-stage exhaust gas outlet assembly communicated with a first exhaust gas outlet of the first-stage cyclone cylinder and an air powder inlet assembly communicated with an air powder inlet of the first-stage cyclone cylinder. And the second-stage fine powder static and dynamic separation device is arranged corresponding to the first-stage exhaust gas outlet assembly, and the second-stage fine powder static and dynamic separation device is configured to increase the rotation momentum of the first-stage exhaust gas entering the second-stage fine powder static and dynamic separation device and conduct air-powder separation.

Description

Technical Field

[0001] The embodiments of the present disclosure belong to the technical field of biomass fuel preparation, and specifically relate to an integrated anti-blocking biomass powder coarse and fine powder staged dynamic and static separation device. Background Art

[0002] Biomass energy reserves are vast and widely distributed. It is a high-quality, clean (zero CO2 emissions) renewable energy source. Proper utilization of biomass energy will have a significant impact on CO2 emission reduction. Biomass combustion power generation technology is an environmentally friendly, efficient, and economical large-scale utilization technology, and is therefore gaining increasing attention in the energy sector both domestically and internationally. Using large, high-efficiency coal-fired units to co-firing biomass fuels for power generation not only significantly improves the efficiency of biomass power generation and conserves biomass resources, but also significantly reduces the carbon emissions of coal-fired power units, thereby enhancing the sustainability of coal-fired power generation and providing a realistic and feasible path for coal-fired power generation to move towards low-carbon development. Domestic coal-fired coupled biomass power generation technology started relatively late, with few cases of continuous operation, and the impact of co-firing on units is still unclear.

[0003] Biomass direct-fired power generation requires grinding the biomass fuel into a powder of acceptable particle size before it can be coupled with coal for combustion. Biomass grinders are key equipment in this process. my country's biomass grinders are based on the development of straw grinders. Currently, the mainstream grinders on the market include hammer mills, chopper mills, and kneading mills. These devices generally produce coarse powder particles, which can easily cause clogging of environmental protection equipment. However, efficient separation of biomass powder, especially the finer powder required for direct-fired power generation, is currently difficult to achieve.

[0004] Therefore, how to solve the above problems has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art and provide an integrated anti-blocking biomass powder coarse and fine powder step-by-step dynamic and static separation device.

[0006] One aspect of an embodiment of the present disclosure provides an integrated anti-blocking biomass powder coarse and fine powder staged dynamic and static separation device, comprising: a first-stage coarse powder cyclone separation device, the first-stage coarse powder cyclone separation device comprising a first-stage cyclone, the first-stage cyclone being provided with a first exhaust gas outlet, a coarse powder outlet, and an air and powder inlet; the first-stage coarse powder cyclone separation device further comprising a first exhaust gas outlet assembly connected to the first exhaust gas outlet of the first-stage cyclone, and an air and powder inlet assembly connected to the air and powder inlet of the first-stage cyclone;

[0007] A secondary fine powder static and dynamic separation device is provided corresponding to the primary exhaust gas outlet assembly, wherein the secondary fine powder static and dynamic separation device is configured to enhance the rotational momentum of the primary exhaust gas entering it and perform air-powder separation on the fine powder in the exhaust gas.

[0008] Optionally, the secondary fine powder static and dynamic separation device includes:

[0009] a stationary blade ring assembly, provided at the outlet end of the first-stage exhaust gas outlet assembly, for guiding the first-stage exhaust gas to generate rotational pre-swirl;

[0010] A moving blade ring assembly is coaxially sleeved on the outer peripheral side of the stationary blade ring assembly, and the moving blade ring assembly is used to apply active tangential acceleration to the first-stage exhaust gas;

[0011] A secondary cyclone is coaxially arranged with the primary cyclone and the moving blade ring assembly, and is disposed on the outer periphery of the moving blade ring assembly. The secondary cyclone has a fine powder outlet at its bottom and a second exhaust gas outlet at its top.

[0012] The first-stage exhaust gas outlet assembly is connected to the stationary blade ring assembly, and both the stationary blade ring assembly and the moving blade ring assembly are configured to enhance the rotational momentum of the first-stage exhaust gas entering the second-stage cyclone.

[0013] Optionally, the secondary fine powder static and dynamic separation device further includes a secondary exhaust gas outlet component, and the secondary exhaust gas outlet component is connected to the second exhaust gas outlet of the secondary cyclone.

[0014] Optionally, the wind and powder inlet is opened on the side wall of the primary cyclone, wherein the wind and powder inlet assembly is inserted into the wind and powder inlet along an axial direction perpendicular to the primary cyclone.

[0015] Optionally, the first-stage cyclone includes a first constant diameter cylinder, a first diverging cylinder connected to the first constant diameter cylinder, and a second constant diameter cylinder connected to the first diverging cylinder at one end away from the first constant diameter cylinder, wherein the second constant diameter cylinder is provided with the first exhaust gas outlet and the first constant diameter cylinder is provided with the coarse powder outlet.

[0016] Optionally, the aperture of the second equal-diameter cylinder is larger than the aperture of the first equal-diameter cylinder.

[0017] Optionally, the secondary fine powder static and dynamic separation device further includes a variable frequency drive device, which is transmission-connected to the moving blade ring assembly.

[0018] Optionally, the moving blade ring assembly is connected to the variable frequency drive device via a drive shaft, wherein the variable frequency drive device is configured to adjust the rotation speed range of the moving blade ring assembly to between 0 and 100 rpm.

[0019] Optionally, the secondary cyclone includes a third equal-diameter cylinder, a second gradually diverging cylinder connected to the third equal-diameter cylinder, and a fourth equal-diameter cylinder at one end of the second gradually diverging cylinder away from the third equal-diameter cylinder, wherein the third equal-diameter cylinder is provided with a fine powder outlet, the fourth equal-diameter cylinder is provided with the second exhaust gas outlet, and the aperture of the fourth equal-diameter cylinder is larger than the aperture of the third equal-diameter cylinder.

[0020] Optionally, the linear velocity of the air-powder mixture in the secondary cyclone is higher than the linear velocity of the air-powder mixture in the primary cyclone.

[0021] The beneficial effects of the embodiments of the present disclosure include:

[0022] Through the synergistic effect of the pre-rotation of the stationary blade ring assembly and the active acceleration of the moving blade ring assembly, the centrifugal force of the exhaust gas is significantly improved, efficient retention of ultrafine powder is achieved, and the fine powder capture rate is significantly improved, meeting the stringent requirements of biomass direct-fired coupled combustion on powder fineness, and the dynamic control function can also accurately adapt to the characteristics of different biomass raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of an integrated anti-blocking biomass powder coarse and fine powder staged dynamic and static separation device according to an embodiment of the present disclosure;

[0024] Figure 2 This is a schematic structural diagram of a two-stage fine powder static and dynamic separation device according to an embodiment of the present disclosure;

[0025] Figure 3 This is a schematic structural diagram of a first-stage coarse powder cyclone separation device according to an embodiment of the present disclosure.

[0026] In the figure, 10, the first-stage coarse powder cyclone separation device; 20, the second-stage fine powder static and dynamic separation device; 1, the air powder inlet assembly; 2, the first-stage cyclone; 3, the second-stage cyclone; 4, the first-stage exhaust gas outlet assembly; 5, the stationary blade ring assembly; 6, the moving blade ring assembly; 7, the frequency conversion drive device; 8, the second-stage exhaust gas outlet assembly; 21, the first constant diameter cylinder; 22, the first gradually expanding cylinder; 23, the second constant diameter cylinder; 31, the third constant diameter cylinder; 32, the second gradually expanding cylinder; 33, the fourth constant diameter cylinder. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0028] The following is a further detailed description of the embodiments of the present application in conjunction with the accompanying drawings and examples. The detailed descriptions and drawings of the following examples are used to illustrate the principles of the present application, but are not used to limit the scope of the present application, that is, the present application is not limited to the described embodiments. In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "multiple" is more than two; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inside", "outside", etc. is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not perpendicular in the strict sense, but is within the allowable error range. "Parallel" is not parallel in the strict sense, but is within the allowable error range.

[0029] It should also be noted that, in the description of this application, unless otherwise specified or limited, the terms "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0030] like Figure 1 As shown, an integrated, anti-blocking, biomass powder coarse and fine powder staged dynamic and static separation device includes: a first-stage coarse powder cyclone separation device 10, which includes a first-stage cyclone 2, which is provided with a first exhaust gas outlet, a coarse powder outlet, and an air and powder inlet. The first-stage coarse powder cyclone separation device 10 also includes a first-stage exhaust gas outlet assembly 4 connected to the first exhaust gas outlet of the first-stage cyclone 2, and an air and powder inlet assembly 1 connected to the air and powder inlet of the first-stage cyclone 2.

[0031] The secondary fine powder static and dynamic separation device 20 is arranged corresponding to the primary exhaust gas outlet component 4, wherein the secondary fine powder static and dynamic separation device 20 is configured to enhance the rotational momentum of the primary exhaust gas entering it and perform air-powder separation on the fine powder in the exhaust gas.

[0032] In some embodiments, the secondary fine powder static and dynamic separation device 20 includes a stationary blade ring assembly 5 , a moving blade ring assembly 6 and a secondary cyclone 3 .

[0033] The stationary blade ring assembly 5 is mounted at the outlet of the first-stage exhaust gas outlet assembly 4 to induce pre-swirl in the first-stage exhaust gas. The moving blade ring assembly 6 is coaxially sleeved on the outer periphery of the stationary blade ring assembly 5 to apply active tangential acceleration to the first-stage exhaust gas.

[0034] The secondary cyclone 3 is coaxially arranged with the primary cyclone 2 and the rotor ring assembly 6, and is positioned on the outer periphery of the rotor ring assembly 6. A fine powder outlet is provided at the bottom of the secondary cyclone 3, and a second exhaust gas outlet is provided at the top. The primary exhaust gas outlet assembly 4 is connected to the stationary ring assembly 5, and both the stationary ring assembly 5 and the rotor ring assembly 6 are configured to increase the rotational momentum of the primary exhaust gas entering the secondary cyclone 3.

[0035] In some embodiments, the secondary fine powder static and dynamic separation device 20 further includes a secondary exhaust gas outlet component 8 , and the secondary exhaust gas outlet component 8 is connected to the second exhaust gas outlet of the secondary cyclone 3 .

[0036] In some embodiments, the wind and powder inlet is opened on the side wall of the primary cyclone 2 , wherein the wind and powder inlet assembly 1 is inserted into the wind and powder inlet along an axial direction perpendicular to the primary cyclone 2 .

[0037] In some embodiments, the first-stage cyclone 2 includes a first constant diameter cylinder 21, a first diverging cylinder 22 connected to the first constant diameter cylinder 21, and a second constant diameter cylinder 23 connected to the first diverging cylinder 22 at one end away from the first constant diameter cylinder 21, wherein the second constant diameter cylinder 23 is provided with the first exhaust gas outlet, and the first constant diameter cylinder 21 is provided with the coarse powder outlet.

[0038] In some embodiments, the aperture of the second constant diameter cylinder 23 is larger than the aperture of the first constant diameter cylinder 21 .

[0039] In some embodiments, the secondary fine powder static and dynamic separation device 20 further includes a variable frequency drive device 7 , and the variable frequency drive device 7 is transmission-connected to the moving blade ring assembly 6 .

[0040] In some embodiments, the moving blade ring assembly 6 is connected to the variable frequency drive device 7 via a drive shaft, wherein the variable frequency drive device 7 is configured to adjust the rotation speed of the moving blade ring assembly 6 to between 0 and 100 rpm.

[0041] In some embodiments, the secondary cyclone 3 includes a third equal-diameter cylinder 31, a second gradually diverging cylinder 32 connected to the third equal-diameter cylinder 31, and a fourth equal-diameter cylinder 33 at one end of the second gradually diverging cylinder 32 away from the third equal-diameter cylinder 31, wherein the third equal-diameter cylinder 31 is provided with a fine powder outlet, the fourth equal-diameter cylinder 33 is provided with the second exhaust gas outlet, and the aperture of the fourth equal-diameter cylinder 33 is larger than the aperture of the third equal-diameter cylinder 31.

[0042] In some embodiments, the linear velocity of the wind-powder mixture in the secondary cyclone 3 is higher than the linear velocity of the wind-powder mixture in the primary cyclone 2. Specifically, the linear velocity of the wind-powder mixture in the secondary cyclone 3 is significantly higher than the linear velocity of the wind-powder mixture in the primary cyclone 2.

[0043] Specifically, the air-powder inlet assembly 1 is connected to the primary cyclone 2, guiding the air-powder airflow to rotate and achieve inertial separation. The top of the primary cyclone 2 is connected to the primary exhaust gas outlet assembly 4. The separated coarse powder is discharged from the bottom of the primary cyclone 2, and the primary exhaust gas enters the secondary fine powder static and dynamic separation device through the primary exhaust gas outlet assembly 4 at the top.

[0044] The stationary blade ring assembly 5 is circumferentially fixed to the upper portion of the primary exhaust gas outlet assembly 4, guiding the primary exhaust gas to generate greater rotational momentum. The moving blade ring assembly 6 is coaxially mounted on the outside of the stationary blade ring assembly 5. Its own rotation drives the primary exhaust gas, further increasing its rotational momentum. The secondary cyclone 3 is coaxially mounted on the outside of the moving blade ring assembly 6. The primary exhaust gas undergoes rotational inertial separation within it, with the separated fine powder discharged through the lower portion of the secondary cyclone 3. The secondary exhaust gas is then discharged through the secondary exhaust gas outlet assembly 8 mounted on the upper portion of the secondary cyclone 3.

[0045] Furthermore, the impeller ring assembly 6 is connected to the driving device 7 , and the impeller of the impeller ring assembly 6 rotates under the drive of the driving device 7 .

[0046] The driving device 7 is a variable speed driving mode. The particle size of the dust particles carried by the secondary exhaust gas is related to the speed of the impeller. The higher the speed of the impeller, the smaller the particle size of the dust particles in the secondary exhaust gas.

[0047] The particle size at the outlet of the first cyclone 2 is larger than that at the outlet of the second cyclone 3. The powder at the outlet of the first cyclone 2 and the outlet of the second cyclone 3 can be introduced into the same device or into different devices as needed.

[0048] The outer diameter of the secondary cyclone 3 on the top side is larger than the inner diameter of the primary cyclone 2 , and the linear velocity of the wind-powder mixture in the secondary cyclone 3 is higher than that in the primary cyclone 2 .

[0049] The blade angle of the stationary blade ring assembly 5 and the blade angle of the moving blade ring assembly 6 of the secondary fine powder static and dynamic separation device are joint design parameters (the airflow swirls at the first level in the stationary blade ring assembly 5 and at the second level in the moving blade ring assembly 6), which are associated with the particle size at the secondary exhaust gas outlet. The larger the blade angle, the greater the linear velocity of the corresponding airflow, and the smaller the particle size at the secondary exhaust gas outlet.

[0050] The beneficial effects of the technical solution of this application include:

[0051] Through the synergistic effect of the pre-rotation of the stationary blade ring assembly and the active acceleration of the moving blade ring assembly, the centrifugal force of the exhaust gas is significantly improved, efficient retention of ultrafine powder is achieved, and the fine powder capture rate is significantly improved, meeting the stringent requirements of biomass direct-fired coupled combustion on powder fineness, and the dynamic control function can also accurately adapt to the characteristics of different biomass raw materials.

[0052] It is understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present disclosure, and the present disclosure is not limited thereto. Those skilled in the art may make various modifications and improvements without departing from the spirit and substance of the present disclosure, and such modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. An integrated anti-blocking biomass powder coarse and fine powder step-by-step dynamic and static separation equipment, characterized in that: include: A first-stage coarse powder cyclone separation device, the first-stage coarse powder cyclone separation device comprising a first-stage cyclone, the first-stage cyclone being provided with a first exhaust gas outlet, a coarse powder outlet, and an air-powder inlet; the first-stage coarse powder cyclone separation device further comprising a first-stage exhaust gas outlet assembly communicating with the first exhaust gas outlet of the first-stage cyclone, and an air-powder inlet assembly communicating with the air-powder inlet of the first-stage cyclone; A secondary fine powder static and dynamic separation device is provided corresponding to the primary exhaust gas outlet assembly, wherein the secondary fine powder static and dynamic separation device is configured to enhance the rotational momentum of the primary exhaust gas entering it and perform air-powder separation on the fine powder in the exhaust gas.

2. The separation device according to claim 1, characterized in that The secondary fine powder static and dynamic separation device comprises: a stationary blade ring assembly, provided at the outlet end of the first-stage exhaust gas outlet assembly, for guiding the first-stage exhaust gas to generate rotational pre-swirl; A moving blade ring assembly is coaxially sleeved on the outer peripheral side of the stationary blade ring assembly, and the moving blade ring assembly is used to apply active tangential acceleration to the first-stage exhaust gas; A secondary cyclone is coaxially arranged with the primary cyclone and the moving blade ring assembly, and is disposed on the outer periphery of the moving blade ring assembly. The secondary cyclone has a fine powder outlet at its bottom and a second exhaust gas outlet at its top. The first-stage exhaust gas outlet assembly is connected to the stationary blade ring assembly, and both the stationary blade ring assembly and the moving blade ring assembly are configured to enhance the rotational momentum of the first-stage exhaust gas entering the second-stage cyclone.

3. The separation device according to claim 2, characterized in that The secondary fine powder static and dynamic separation device further includes a secondary exhaust gas outlet component, and the secondary exhaust gas outlet component is connected to the second exhaust gas outlet of the secondary cyclone.

4. The separation device according to claim 1, characterized in that The wind and powder inlet is opened on the side wall of the first-stage cyclone, wherein the wind and powder inlet assembly is inserted into the wind and powder inlet along an axial direction perpendicular to the first-stage cyclone.

5. The separation device according to claim 1, characterized in that The first-stage cyclone includes a first constant diameter cylinder, a first diverging cylinder connected to the first constant diameter cylinder, and a second constant diameter cylinder connected to the first diverging cylinder at one end away from the first constant diameter cylinder, wherein the second constant diameter cylinder is provided with the first exhaust gas outlet, and the first constant diameter cylinder is provided with the coarse powder outlet.

6. The separation device according to claim 5, characterized in that The aperture of the second equal-diameter cylinder is larger than the aperture of the first equal-diameter cylinder.

7. The separation device according to claim 2, characterized in that The secondary fine powder static and dynamic separation device further includes a variable frequency drive device, which is transmission-connected to the moving blade ring assembly.

8. The separation device according to claim 7, characterized in that The moving blade ring assembly is connected to the variable frequency drive device via a drive shaft, wherein the variable frequency drive device is configured to adjust the rotation speed range of the moving blade ring assembly to between 0 and 100 rpm.

9. The separation device according to claim 2, characterized in that The secondary cyclone includes a third constant diameter cylinder, a second gradually diverging cylinder connected to the third constant diameter cylinder, and a fourth constant diameter cylinder at one end of the second gradually diverging cylinder away from the third constant diameter cylinder, wherein the third constant diameter cylinder is provided with a fine powder outlet, the fourth constant diameter cylinder is provided with the second exhaust gas outlet, and the aperture of the fourth constant diameter cylinder is larger than the aperture of the third constant diameter cylinder.

10. The separation device according to claim 2, characterized in that The linear velocity of the wind-powder mixture in the secondary cyclone is higher than the linear velocity of the wind-powder mixture in the primary cyclone.

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