Pulverized coal dense-thin separation device of deep peak regulation coal-fired boiler

Abstract

The invention provides a pulverized coal dense-thin separation device of a deep peak regulation coal-fired boiler. The pulverized coal dense-thin separation device comprises a separation main pipe, a first adjusting baffle, a primary separation pipe, a first partition plate and a second adjusting baffle. The separation mother pipe is of an elbow round pipe structure; the separation mother pipe comprises an inlet straight pipe section, an outlet straight pipe section and an elbow section, one end of the elbow section is connected with the inlet straight pipe section, and the other end of the elbow section is connected with the outlet straight pipe section; the first adjusting baffle is rotatably arranged on the inlet straight pipe section; one end of the primary separation pipe penetrates through the elbow section and is close to the first adjusting baffle; the first partition plate is arranged at the joint of the outlet straight pipe section and the elbow section; the second adjusting baffle is rotationally arranged on the side, away from the elbow section, of the first partition plate. The device has the technical effects that the device can adapt to different coal quality and operation load conditions, the concentration separation effect of pulverized coal is flexibly adjusted, and the generation amount of nitric oxide is reduced while the stable combustion performance is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of coal-fired power generation, and in particular relates to a pulverized coal concentration-lean separation device for a deep peak-shaving coal-fired boiler. Background Art

[0002] The rapid development of society is inseparable from electricity. The foundation of power development is energy. For a long time, thermal power generation has been dominant in the energy and power industry, and for a long time in the future, the energy utilization pattern dominated by coal will not change. However, with the vigorous exploitation of coal resources, in order to face the problem of resource shortages that may arise in the future, the installed capacity of clean energy such as solar energy and wind energy has increased year by year, saving resources while also alleviating environmental pressure, making emerging renewable energy power generation gradually become the development trend of the future power industry. However, new energy power generation is greatly affected by geographical location and environmental factors, making its support and resistance weak. When it is connected to the power grid on a large scale, its volatility and intermittency will pose a threat to the safety of the power system. Thermal power generation, especially coal-fired power generation, has mature technology and rich experience in peak-shaving operation, which is of far-reaching significance for promoting the consumption of new energy. Allowing coal-fired units to participate in deep peak-shaving of the power grid is the most realistic and feasible method.

[0003] Deep peak load regulation requires power plants to reduce their output and operate boilers at lower loads, which leads to problems such as uneven flame distribution in the furnace, decreased furnace temperature, and safety of hydrodynamic conditions, which in turn reduces boiler efficiency due to incomplete combustion, and even causes safety accidents such as overheating and bursting of metal tube walls and low-temperature corrosion. In addition to safety and economy, environmental protection requirements also need to be considered when the boiler is running at low load, but this is at the expense of the temperature of the combustion area, which affects the fuel of pulverized coal. Furthermore, as the peak load demand becomes more and more stringent, it is difficult to achieve low-load stable combustion while reducing nitrogen oxide NOx emissions by relying solely on the existing burner layout.

[0004] In addition, when the boiler is running at a lower load, the furnace temperature is reduced, and the pulverized coal is divided into two streams of dense and thin air before the burner and sprayed into the furnace for combustion. The dense pulverized coal airflow can reduce the ignition heat of the pulverized coal, advance the ignition of the pulverized coal, and improve the ignition stability, thereby improving the stable combustion ability of the burner. The graded combustion formed by the dense and thin separation forms a reducing atmosphere during the combustion process, which effectively reduces the NOx emission level. However, the elbow or blunt body separator currently used has the disadvantages of unsatisfactory separation effect. It is necessary to improve the separation level of the dense and thin separation device to further achieve low NOx stable combustion under low load of the boiler. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art and provide a new technical solution for a pulverized coal concentration-lean separation device for a deep peak-shaving coal-fired boiler.

[0006] According to a first aspect of the present invention, a pulverized coal concentration-lean separation device for a deep peak-shaving coal-fired boiler is provided, comprising a separation mother pipe, a first regulating baffle, a primary separation pipe, a first partition plate, and a second regulating baffle; the separation mother pipe is an elbow circular pipe structure;

[0007] The separation mother pipe comprises an inlet straight pipe section, an outlet straight pipe section and an elbow section, one end of the elbow section is connected to the inlet straight pipe section, and the other end is connected to the outlet straight pipe section;

[0008] The first adjusting baffle is rotatably arranged on the inner side of the inlet straight pipe section close to one end of the elbow section, and the rotation center of the first adjusting baffle is located on the axis of the inlet straight pipe section;

[0009] One end of the primary separation pipe passes through the elbow section and is close to the first regulating baffle, and the primary separation pipe and the inlet straight pipe section are coaxially arranged;

[0010] The first partition is arranged at the junction of the outlet straight pipe section and the elbow section, and is located on the axis of the outlet straight pipe section;

[0011] The second regulating baffle is rotatably arranged on a side of the first baffle away from the elbow section, and the rotation center of the second regulating baffle is located on the axis of the outlet straight pipe section;

[0012] The first adjusting baffle and the primary separation tube form an inlet separation guide structure, the first partition plate and the second adjusting baffle form an outlet guide structure, and by adjusting the angle between the first adjusting baffle and the axis of the inlet straight pipe section, primary thick and thin separation of the coal powder is performed; by adjusting the angle between the second adjusting baffle and the axis of the outlet straight pipe section, secondary thick and thin separation of the coal powder is performed.

[0013] Optionally, the pulverized coal concentration and thinness separation device of the deep peak-shaving coal-fired boiler further includes a second partition;

[0014] The second partition is arranged on a side of the second regulating baffle away from the first partition, and at least a portion of the second partition is located on the axis of the outlet straight pipe section.

[0015] Optionally, the second partition is a Y-shaped bluff structure.

[0016] Optionally, a flow area of ​​the elbow section close to one end of the inlet straight pipe section is larger than a flow area of ​​the inlet straight pipe section.

[0017] Optionally, the flow area of ​​one end of the outlet straight pipe section close to the elbow section gradually decreases from close to the elbow section to away from the elbow section.

[0018] Optionally, the primary separation tube is a circular straight tube.

[0019] Optionally, the flow area of ​​one end of the primary separation tube close to the first regulating baffle is smaller than the flow area of ​​the other end, and a gradually expanding and reducing diameter channel is formed in the middle of the primary separation tube.

[0020] Optionally, the gradually expanding and reducing diameter channel is located on the inner side of the elbow section.

[0021] Optionally, the inner wall surface of the separation mother tube and the outer wall surface of the primary separation tube are both made of wear-resistant materials or coatings.

[0022] Optionally, a wear-resistant layer is formed on the surfaces of the first adjustment baffle, the first partition, the second adjustment baffle and the second partition.

[0023] A technical effect of the present invention is:

[0024] In the embodiment of the present application, the pulverized coal-fired boiler's thick-to-thin separation device enables the pulverized coal airflow of the coal-fired boiler to obtain a better thick-to-thin separation effect before entering the burner for combustion, and can burn stably and maintain low NOx emissions during low-load operation; in addition, the pulverized coal-fired boiler's thick-to-thin separation device can also be adjusted according to actual thick-to-thin separation needs, thereby improving its adaptability to different loads and coal qualities, and can effectively improve the thick-to-thin separation effect under different coal qualities and operating load conditions, thereby increasing the pulverized coal ignition rate, reducing the generation of nitrogen oxides, and ensuring efficient and stable operation of boiler combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a pulverized coal concentration-lean separation device for a deep peak-shaving coal-fired boiler according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic structural diagram of a pulverized coal concentration-lean separation device for a deep peak-shaving coal-fired boiler according to an embodiment of the present invention;.

[0027] In the figure: 1, separation mother pipe; 11, inlet straight pipe section; 12, outlet straight pipe section;

[0028] 13. elbow section; 2. primary separation pipe; 3. first regulating baffle; 4. first partition;

[0029] 5. The second adjustment baffle; 6. The second partition. DETAILED DESCRIPTION

[0030] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0031] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0032] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0034] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] According to a first aspect of the present invention, see Figure 1 and Figure 2 , provides a pulverized coal concentration-lean separation device for a deep peak-shaving coal-fired boiler, which is applied to a coal-fired boiler and is used to separate the pulverized coal airflow entering the burner into a concentration-lean separation device.

[0036] Specifically, the pulverized coal concentration separation device of the deep peak-shaving coal-fired boiler comprises a separation mother pipe 1, a first regulating baffle 3, a primary separation pipe 2, a first partition plate 4 and a second regulating baffle 5; the separation mother pipe 1 is an elbow circular pipe structure;

[0037] The separation mother pipe 1 comprises an inlet straight pipe section 11, an outlet straight pipe section 12 and an elbow section 13, one end of the elbow section 13 is connected to the inlet straight pipe section 11, and the other end is connected to the outlet straight pipe section 12;

[0038] The first adjusting baffle 3 is rotatably disposed on the inner side of the inlet straight pipe section 11 close to one end of the elbow section 13, and the rotation center of the first adjusting baffle 3 is located on the axis of the inlet straight pipe section 11;

[0039] One end of the primary separation pipe 2 passes through the elbow section 13 and is close to the first regulating baffle 3, and the primary separation pipe 2 and the inlet straight pipe section 11 are coaxially arranged; the other end of the primary separation pipe 2 extends to the inlet of the pulverized coal burner;

[0040] The first partition plate 4 is disposed at the junction of the outlet straight pipe section 12 and the elbow section 13 and is located on the axis of the outlet straight pipe section 12;

[0041] The second adjustment baffle 5 is rotatably disposed on the side of the first baffle 4 away from the elbow section 13, and the rotation center of the second adjustment baffle 5 is located on the axis of the outlet straight pipe section 12;

[0042] The first regulating baffle 3 and the primary separation tube 2 form an inlet separation guide structure, that is, the light coal powder airflow separated by the first regulating baffle 3 enters the primary separation tube 2, and the dense coal powder airflow enters the flow space between the separation mother tube 1 and the primary separation tube 2; the first partition plate 4 and the second regulating baffle 5 form an outlet guide structure, and the primary dense and thin separation of the coal powder is performed by adjusting the angle between the first regulating baffle 3 and the axis of the inlet straight pipe section 11; the secondary dense and thin separation of the coal powder is performed by adjusting the angle between the second regulating baffle 5 and the axis of the outlet straight pipe section 12.

[0043] In the embodiment of the present application, the pulverized coal-fired boiler's thick-to-thin separation device enables the pulverized coal airflow of the coal-fired boiler to obtain a better thick-to-thin separation effect before entering the burner for combustion, and can burn stably and maintain low NOx emissions during low-load operation; in addition, the pulverized coal-fired boiler's thick-to-thin separation device can also be adjusted according to actual thick-to-thin separation needs, thereby improving its adaptability to different loads and coal qualities, and can effectively improve the thick-to-thin separation effect under different coal qualities and operating load conditions, thereby increasing the pulverized coal ignition rate, reducing the generation of nitrogen oxides, and ensuring efficient and stable operation of boiler combustion.

[0044] Optionally, the pulverized coal concentration and thinness separation device of the deep peak-shaving coal-fired boiler further includes a second partition plate 6;

[0045] The second partition plate 6 is disposed on a side of the second adjustment baffle 5 away from the first partition plate 4 , and at least a portion of the second partition plate 6 is located on the axis of the outlet straight pipe section 12 .

[0046] In the above embodiment, the second partition plate 6 can further guide the coal powder airflow in the outlet straight pipe section 12, thereby facilitating the smooth transportation of the coal powder to the burner.

[0047] Optionally, the second partition plate 6 is a Y-shaped blunt body structure, which better ensures the flow guiding effect of the second partition plate 6.

[0048] Optionally, the flow area of ​​the elbow section 13 near one end of the inlet straight pipe section 11 is larger than the flow area of ​​the inlet straight pipe section 11. This allows a small number of coal powder particles to bypass the first regulating baffle 3 and enter the primary separation pipe 2, i.e., the light side coal powder channel, while most of the coal powder particles enter the dense side channel, i.e., the flow space between the primary separation pipe 2 and the separation mother pipe 1.

[0049] Optionally, the flow area of ​​the outlet straight pipe section 12 at one end close to the elbow section 13 gradually decreases from the direction close to the elbow section 13 to the direction away from the elbow section 13. This better ensures the separation effect of the outlet straight pipe section 12 on coal powder.

[0050] Optionally, the primary separation tube 2 is a round straight tube, which makes the primary separation tube 2 have a better separation effect.

[0051] Optionally, the flow area of ​​one end of the primary separation pipe 2 close to the first regulating baffle 3 is smaller than the flow area of ​​the other end, and a gradually expanding variable diameter channel is formed in the middle of the primary separation pipe 2. The primary separation pipe 2 is reasonably designed and helps to achieve primary separation of coal powder.

[0052] Optionally, the gradually expanding and reducing channel is located inside the elbow section 13. This helps the light coal powder to enter the light-side coal powder channel of the primary separation pipe 2.

[0053] Optionally, the inner wall surface of the separation mother tube 1 and the outer wall surface of the primary separation tube 2 are both made of wear-resistant materials or coatings, which better ensures the wear resistance of the separation mother tube 1 and the primary separation tube 2 and significantly improves the safety of use.

[0054] Optionally, a wear-resistant layer is formed on the surfaces of the first regulating baffle 3, the first partition 4, the second regulating baffle 5 and the second partition 6. This better ensures the safety and stability of the operation of the pulverized coal concentration separation device of the deep peak-shaving coal-fired boiler.

[0055] In a specific embodiment, the working principle of the pulverized coal concentration separation device of the deep peak-shaving coal-fired boiler is as follows:

[0056] like Figure 1 As shown, the first adjustment baffle 3 is in motion, and the second adjustment baffle 5 is inactive.

[0057] When the horizontal angle between the second adjusting baffle 5 and the axis of the outlet straight pipe section 12 of the separation mother pipe 1 is 0°, and the vertical angle between the first adjusting baffle 3 and the axis of the inlet straight pipe section 11 of the separation mother pipe 1 is 0°, the first adjusting baffle 3 has almost no effect on the trajectory distribution of the coal powder particles, and the coal powder on the rich side and the lean side is evenly distributed.

[0058] When the angle between the first regulating baffle 3 and the axis of the inlet straight pipe section 11 of the separation mother pipe 1 increases to 30°, the first regulating baffle 3 begins to block the coal powder airflow entering the inlet straight pipe section 11 of the separation mother pipe 1. After the coal powder particles contact the first regulating baffle 3, they are affected by the combined action of inertia and collision force, and the trajectory of the coal powder particles changes. A small number of coal powder particles can bypass the first regulating baffle 3 and enter the primary separation pipe 2, that is, the light side coal powder channel, while most of the coal powder particles enter the concentrated side channel, that is, the flow space between the primary separation pipe 2 and the separation mother pipe 1. Due to the increase in the angle between the first regulating baffle 3 and the axis of the inlet straight pipe section 11 of the separation mother pipe 1, a recirculation zone is generated on the light side of the leeward side of the first regulating baffle 3, which increases the residence time of the coal powder particles. At this time, the coal powder concentration at the outlet of the primary separation pipe 2 is 35%, while the coal powder concentration at the outlet of the separation mother pipe 1 is 65%, and a coal powder concentration-light ratio of 1.86 can be achieved.

[0059] When the angle between the first regulating baffle 3 and the axis of the inlet straight pipe section 11 of the separation mother pipe 1 increases to 40°, the amount of pulverized coal introduced into the concentrated side channel also increases, while the amount of pulverized coal on the lean side decreases with the increase of the baffle angle. At this time, the pulverized coal concentration at the outlet of the primary separation pipe 2 is 31%, while the pulverized coal concentration at the outlet of the separation mother pipe 1 is 69%, and the pulverized coal concentration ratio can be further increased to 2.23.

[0060] When the angle between the first regulating baffle 3 and the axis of the inlet straight pipe section 11 of the separation mother pipe 1 increases from 40° to 50°, the coal powder concentration at the outlet of the primary separation pipe 2 is 20%, while the coal powder concentration at the outlet of the separation mother pipe 1 is 80%, and the coal powder ratio can be further increased to 4.

[0061] It should be noted that, in this embodiment, as the angle between the first adjusting baffle 3 and the axis of the inlet straight pipe section 11 of the separation mother pipe 1 increases, the area of ​​the leeward recirculation zone of the first adjusting baffle 3 gradually increases. The recirculation zone will cause velocity loss. In order to ensure a good coal powder supply capacity, the fan output needs to be increased appropriately.

[0062] In another embodiment, the working principle of the pulverized coal concentration separation device of the deep peak-shaving coal-fired boiler is as follows:

[0063] like Figure 2 As shown, the first adjustment baffle 3 does not move, and the second adjustment baffle 5 moves.

[0064] When the included angle between the first regulating baffle 3 and the axis of the inlet straight pipe section 11 of the separation mother pipe 1 in the vertical direction is 0°, and the included angle between the second regulating baffle 5 and the axis of the outlet straight pipe section 12 of the separation mother pipe 1 in the horizontal direction is 0°, the first regulating baffle 3 has almost no effect on the distribution of the trajectory of the coal powder particles. When the coal powder airflow enters the inlet straight pipe section 11 of the separation mother pipe 1, due to the influence of centrifugal force, at the elbow section 13 of the separation mother pipe 1, the denser coal powder airflow will be distributed on the outside, and then enter the outlet straight pipe section 12 of the separation mother pipe 1, first Under the guiding effect of the first partition 4, the coal powder airflow is divided into two streams, thick and thin, in the vertical direction. The thick coal powder airflow is above the first partition 4, and the thin coal powder airflow is below. At this time, the angle between the second adjusting baffle 5 and the axis of the outlet straight pipe section 12 of the separation mother pipe 1 is 0°, and the thick and thin separation of coal powder is achieved only by the centrifugal effect of the elbow section 13. After further guidance by the second partition 6, the coal powder concentration in the circulation space above the outlet straight pipe section 12 of the separation mother pipe 1 is 55%, and the coal powder concentration in the circulation space below is 45%. At this time, the coal powder thick and thin ratio is 1.22.

[0065] When the angle between the second regulating baffle 5 and the axis of the outlet straight pipe section 12 of the separation mother pipe 1 is 30°, the coal powder airflow of the outlet straight pipe section 12 of the separation mother pipe 1 begins to be blocked by the second regulating baffle 5. Due to inertia and impact force, most of the coal powder particles enter the concentrated coal powder channel in the upper space of the outlet straight pipe section 12, and a small part of the coal powder particles bypass the second regulating baffle 5 and enter the lean coal powder channel on the lower side. After further diversion by the second partition 6, the coal powder concentration in the circulation space above the outlet straight pipe section 12 of the separation mother pipe 1 is 65%, and the coal powder concentration in the circulation space below is 35%. At this time, the coal powder concentration-lean ratio is 1.86.

[0066] When the angle between the second adjusting baffle 5 and the axis of the outlet straight pipe section 12 of the separation mother pipe 1 is 40°, the separation effect of the second adjusting baffle 5 is more obvious, the coal powder concentration in the circulation space above the outlet straight pipe section 12 of the separation mother pipe 1 is 69%, and the coal powder concentration in the circulation space below is 31%. At this time, the coal powder concentration ratio is 2.23.

[0067] When the angle between the second regulating baffle 5 and the axis of the outlet straight pipe section 12 of the separation mother pipe 1 is 50°, the coal powder airflow is more strongly blocked by the second regulating baffle 5, and the coal powder concentration in the circulation space above the outlet straight pipe section 12 of the separation mother pipe 1 is 76%, and the coal powder concentration in the circulation space below is 24%. At this time, the coal powder concentration ratio is 3.17.

[0068] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A pulverized coal concentration and thinness separation device for a deep peak-shaving coal-fired boiler, characterized in that: It includes a separation mother pipe, a first regulating baffle, a primary separation pipe, a first partition plate and a second regulating baffle; the separation mother pipe is an elbow circular pipe structure; The separation mother pipe comprises an inlet straight pipe section, an outlet straight pipe section and an elbow section, one end of the elbow section is connected to the inlet straight pipe section, and the other end is connected to the outlet straight pipe section; The first adjusting baffle is rotatably arranged on the inner side of the inlet straight pipe section close to one end of the elbow section, and the rotation center of the first adjusting baffle is located on the axis of the inlet straight pipe section; One end of the primary separation pipe passes through the elbow section and is close to the first regulating baffle, and the primary separation pipe and the inlet straight pipe section are coaxially arranged; The first partition is arranged at the junction of the outlet straight pipe section and the elbow section, and is located on the axis of the outlet straight pipe section; The second regulating baffle is rotatably arranged on a side of the first baffle away from the elbow section, and the rotation center of the second regulating baffle is located on the axis of the outlet straight pipe section; By adjusting the angle between the first adjusting baffle and the axis of the inlet straight pipe section, primary thick and thin separation of coal powder is performed; by adjusting the angle between the second adjusting baffle and the axis of the outlet straight pipe section, secondary thick and thin separation of coal powder is performed.

2. The pulverized coal concentration and thinness separation device for a deep peak-shaving coal-fired boiler according to claim 1 is characterized in that: Also included is a second baffle; The second partition is arranged on a side of the second regulating baffle away from the first partition, and at least a portion of the second partition is located on the axis of the outlet straight pipe section.

3. The pulverized coal concentration and thinness separation device for a deep peak-shaving coal-fired boiler according to claim 2 is characterized in that: The second partition is a Y-shaped bluff structure.

4. The pulverized coal concentration and thinness separation device for a deep peak-shaving coal-fired boiler according to claim 1 is characterized in that: The flow area of ​​the elbow section close to one end of the inlet straight pipe section is larger than the flow area of ​​the inlet straight pipe section.

5. The pulverized coal concentration and thinness separation device for a deep peak-shaving coal-fired boiler according to claim 1, characterized in that: The flow area of ​​one end of the outlet straight pipe section close to the elbow section gradually decreases from the direction close to the elbow section to the direction away from the elbow section.

6. The pulverized coal concentration and thinness separation device for a deep peak-shaving coal-fired boiler according to claim 5 is characterized in that: The primary separation tube is a circular straight tube.

7. The pulverized coal concentration and thinness separation device for a deep peak-shaving coal-fired boiler according to claim 6 is characterized in that: The flow area of ​​one end of the primary separation tube close to the first regulating baffle is smaller than the flow area of ​​the other end, and a gradually expanding and reducing diameter channel is formed in the middle of the primary separation tube.

8. The pulverized coal concentration and thinness separation device for a deep peak-shaving coal-fired boiler according to claim 7, characterized in that: The gradually expanding and reducing diameter channel is located on the inner side of the elbow section.

9. The pulverized coal concentration and thinness separation device for a deep peak-shaving coal-fired boiler according to claim 1, characterized in that: The inner wall surface of the separation mother tube and the outer wall surface of the primary separation tube are both made of wear-resistant materials or coatings.

10. The pulverized coal concentration and thinness separation device for a deep peak-shaving coal-fired boiler according to claim 2, characterized in that: A wear-resistant layer is formed on the surfaces of the first adjustment baffle, the first partition, the second adjustment baffle and the second partition.

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