Primary air powder adjusting device, control method and readable storage medium

Abstract

The invention provides a primary air and powder adjusting device, a control method and a readable storage medium, and belongs to the technical field of air and powder adjustment. Comprising an outer-ring pulverized coal pipeline and an inner-ring pulverized coal pipeline, the inner-ring pulverized coal pipeline is arranged in the outer-ring pulverized coal pipeline through at least one dredging frame plate, a first pulverized coal channel is formed between the inner-ring pulverized coal pipeline and the outer-ring pulverized coal pipeline, and the interior of the inner-ring pulverized coal pipeline serves as a second pulverized coal channel; the air and powder distributing mechanism is arranged on the dredging frame plate and used for distributing the primary air and powder airflow entering the outer ring pulverized coal pipeline to a first pulverized coal channel and a second pulverized coal channel, and the pulverized coal concentration of the primary air and powder airflow in the first pulverized coal channel is larger than that of the primary air and powder airflow in the second pulverized coal channel; and the opening degree adjusting mechanism is arranged on the outer ring pulverized coal pipeline and used for adjusting the opening degree of the first pulverized coal channel so as to adjust the primary air speed and the pulverized coal concentration. The device is simple in structure and high in stability, the primary air speed and the pulverized coal concentration can be adjusted, pulverized coal is evenly distributed, and the combustion effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air-powder regulation, and in particular to a primary air-powder regulation device, a control method for the primary air-powder regulation device and a readable storage medium. Background Art

[0002] At present, coal-fired power mainly plays a role in guaranteeing the supply of power in the power grid, and needs to frequently participate in deep peak regulation. During the peak regulation process, the load of the boiler changes frequently, which puts higher requirements on the stability of combustion in the furnace. The combustion process in the furnace directly depends on the operating status of the primary air-powder system. The uniformity and stability of the primary air-powder velocity concentration directly affect the combustion efficiency, pollutant emissions and life of the boiler equipment of the boiler system. However, the existing air-powder system adjustment methods are often unable to adapt to the situation of frequent deep peak regulation. There are common problems such as uneven air-powder mixing and large concentration fluctuations, which lead to unstable combustion process and may even cause equipment failures and safety accidents.

[0003] At present, power plants mainly adjust the primary air speed by adjusting the adjustable shrinkage hole of the powder pipe, and this device cannot adjust the air-powder concentration. Therefore, improvements are currently being made in the following aspects: 1) The traditional air-powder mixer is upgraded to adapt to the needs of different coal types and combustion conditions, and to achieve full mixing of coal powder and air, thereby improving combustion efficiency. 2) Introduce variable frequency speed regulation technology to achieve flexible adjustment of the primary fan speed. According to actual combustion requirements, the conveying wind speed and concentration of the air-powder mixture are accurately controlled to improve the stability of the combustion process. 3) In view of the possible blockage and wear problems of the primary air-powder pipeline, wear-resistant materials are used to make pipelines and valves, and anti-blocking and anti-wear measures such as ash cleaning devices are added to ensure the smooth transportation of the air-powder mixture. 4) Through modular design and integrated transformation, the equipment structure is simplified, the reliability and maintainability of the equipment are improved, and the equipment replacement and transformation are more convenient.

[0004] Among them, the Chinese patent document with application number: 201820599483.5 and titled "A device for regulating the air and powder speed of a powder tube" proposes a device for regulating the air and powder speed of a powder tube. By changing the angles of the baffles of the inner and outer regulating tubes, the flow area in the powder tube is changed to achieve a uniform distribution of the air and powder speed in the powder tube and optimize the combustion effect. However, the adjustment accuracy of the device is affected by multiple factors such as manufacturing accuracy, material properties, and long-term operation wear. At the same time, the device contains multiple adjustable baffles, and the operation process is relatively complicated, which can easily lead to unsatisfactory adjustment effects.

[0005] The Chinese patent document with application number: 202020347531.9 and titled "A two-phase adjustable pulverized coal distributor with air and powder" proposes a two-phase adjustable pulverized coal distributor with air and powder, which uses the difference in inertia of pulverized coal particles to form a thick and thin two-phase primary air and powder. The two phases are divided into two air and powder flows through additionally installed elbows and special-shaped pipes, which are adjusted by regulating valves to achieve separate adjustment of pulverized coal concentration and wind speed. The device includes multiple components such as elbows, special-shaped pipes, flared pipes, thick phase regulating valves and thin phase regulating valves. It has a complex structure, is difficult to manufacture and install, and has high maintenance difficulty and cost. In actual applications, the adjustment accuracy and stability of the thick and thin phase regulating valves are affected by multiple factors such as the quality of the valve, the accuracy and stability of the control system, etc., which can easily lead to uneven distribution of pulverized coal and affect the combustion effect.

[0006] The Chinese patent document with application number: 202310895466.1 and titled "An adjustable shrinkage hole for a pulverized coal pipeline that can prevent jamming" proposes an adjustable shrinkage hole for a pulverized coal pipeline that can prevent jamming. By adding an adjustable shrinkage hole structure including a shrinkage hole adjustment section, an adjustment hand wheel, a screw and other components, the shrinkage hole of the pulverized coal pipeline can be flexibly adjusted and effectively prevent the occurrence of jamming. However, the shrinkage hole adjustment mechanism of the device is complex, which can easily lead to increased maintenance costs and affect the economy of long-term operation. Under harsh working conditions such as high temperature, high humidity or uneven coal powder particle size, the wear resistance and stability of the adjustable shrinkage hole are also affected.

[0007] Based on the above situation, there is an urgent need to develop a device that can independently and accurately control the primary wind speed and coal powder concentration, effectively improve the uniformity of heat load distribution in the boiler furnace, solve the steam temperature deviation and oxygen content deviation caused by uneven heat load distribution, and effectively solve the heating surface safety problems caused by uneven heat load distribution of deep peak-shaving boilers. Summary of the invention

[0008] The purpose of the embodiments of the present invention is to provide a primary air-powder regulating device, a control method and a readable storage medium to solve the above-mentioned problems such as uneven air-powder mixing and large concentration fluctuations, which lead to unstable combustion process and may even cause equipment failure and safety accidents.

[0009] In order to achieve the above object, an embodiment of the present invention provides a primary air powder regulating device, the device comprising: An outer ring pulverized coal pipeline and an inner ring pulverized coal pipeline, wherein the inner ring pulverized coal pipeline is arranged in the internal accommodation space of the outer ring pulverized coal pipeline through at least one guide frame plate, the outer wall of the inner ring pulverized coal pipeline and the inner wall of the outer ring pulverized coal pipeline form a first pulverized coal channel, and the internal accommodation space of the inner ring pulverized coal pipeline serves as a second pulverized coal channel; The air-powder flow splitting mechanism is arranged on the guide frame plate and is located below the pipe opening of the inner ring pulverized coal pipeline, and is used to split the primary air-powder flow entering the outer ring pulverized coal pipeline into the first pulverized coal channel and the second pulverized coal channel, wherein the pulverized coal concentration of the primary air-powder flow in the first pulverized coal channel is greater than the pulverized coal concentration of the primary air-powder flow in the second pulverized coal channel; The opening adjustment mechanism is arranged on the outer ring pulverized coal pipeline and is used to adjust the opening of the first pulverized coal channel to adjust the primary air speed and the pulverized coal concentration.

[0010] Optionally, an air-powder guide ring is provided on the inner wall of the outer ring pulverized coal pipeline to reduce the friction of the pulverized coal in the primary air-powder airflow on the inner wall of the outer ring pulverized coal pipeline.

[0011] Optionally, the air-powder diversion mechanism includes: The air-powder flow divider is connected to the guide frame plate through at least one connecting rod. The air-powder flow divider is located directly below the pipe opening of the inner ring coal powder pipeline, and the windward surface of the air-powder flow divider is an arc surface.

[0012] Optionally, the opening adjustment mechanism includes: a first adjustment mechanism and a second adjustment mechanism arranged opposite to each other, and the first adjustment mechanism and the second adjustment mechanism each include: A sealing box, fixedly arranged on the outer ring pulverized coal pipeline, the sealing box is communicated with the first pulverized coal channel, and tracks are arranged opposite to each other in the sealing box; a baffle, slidably disposed on the track via rollers, and configured to slide along the track under the action of a driving force to adjust the opening of the first pulverized coal channel; The driving mechanism is arranged on the sealing box, and the driving rod of the driving mechanism passes through the sealing box and is connected to the baffle to generate the driving force. The driving rod is connected to the sealing box in a dynamic sealing manner to prevent the primary air and powder air flow from leaking outward.

[0013] Optionally, a plurality of sealing strips are arranged at intervals in the sealing box to prevent coal powder from entering the sealing box; The sealing box is provided with an airflow interface at the end close to the driving mechanism, which is used to receive the airflow and blow the coal powder in the sealing box into the first coal powder channel; A plurality of powder discharge holes are arranged at intervals on the track to discharge the coal powder on the track into the sealing box.

[0014] Optionally, a plurality of balancing grooves are provided on the baffle plate to balance the pressure on the upper and lower surfaces of the baffle plate and to prevent coal powder from being deposited on the upper surface of the baffle plate.

[0015] Optionally, the device further comprises: The controller is connected to the control end of the driving mechanism and is used to control the driving mechanism to drive the baffle to move based on the wind speed of the primary air powder collected on the primary powder pipe and the coal powder concentration in the primary air powder to change the opening of the first coal powder channel.

[0016] Optionally, flanges are provided at both ends of the outer ring pulverized coal pipeline.

[0017] In a second aspect, an embodiment of the present invention further provides a control method for a primary air powder regulating device, which is applied to the primary air powder regulating device mentioned above, and the method comprises: Obtain the wind speed of the primary air powder collected on the primary powder pipe and the coal powder concentration in the primary air powder; Based on the wind speed and the preset wind speed, a wind speed deviation is calculated; and based on the coal powder concentration and the preset coal powder concentration, a coal powder concentration deviation is calculated; If the wind speed deviation or the coal powder concentration deviation is greater than a first set threshold, the opening adjustment mechanism is controlled to reduce the opening of the first coal powder channel at a first preset rate, and the deviation change rate of the wind speed deviation or the coal powder concentration deviation is obtained in real time. If the deviation change rate is greater than a set change rate threshold, the opening adjustment mechanism is controlled to reduce the opening of the first coal powder channel at a second preset rate until the wind speed deviation or the coal powder concentration deviation is less than the first set threshold; If the wind speed deviation or the coal powder concentration deviation is less than a second set threshold, the opening adjustment mechanism is controlled to increase the opening of the first coal powder channel at a first preset rate, and the deviation change rate of the wind speed deviation or the coal powder concentration deviation is obtained in real time. If the deviation change rate is greater than a set change rate threshold, the opening adjustment mechanism is controlled to increase the opening of the first coal powder channel at a second preset rate until the wind speed deviation or the coal powder concentration deviation is greater than the second set threshold; The first preset rate is greater than the second preset rate.

[0018] On the other hand, an embodiment of the present invention provides a readable storage medium, on which instructions are stored, and the instructions are used to implement the control method of the primary air powder regulating device of the machine.

[0019] The technical solution arranges an outer ring pulverized coal pipeline and an inner ring pulverized coal pipeline to form two different pulverized coal channels, and the primary air-powder airflow is diverted by means of an air-powder diversion mechanism, and then the opening of the first pulverized coal channel is adjusted by means of an opening adjustment mechanism to adjust the primary air speed and pulverized coal concentration. The overall device has a simple structure and high operating stability, and can accurately adjust the primary air speed and pulverized coal concentration with small fluctuations, so that the pulverized coal is evenly distributed, thereby improving the uniformity of the heat load distribution in the boiler furnace, improving the combustion effect, and ensuring the safety of operation.

[0020] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings: Figure 1 It is a schematic cross-sectional structure diagram of the primary air powder regulating device provided by the present invention; Figure 2 is a top view of the primary air powder regulating device provided by the present invention; Figure 3 It is a structural schematic diagram of the baffle provided by the present invention; Figure 4 It is a flow chart of a control method of a primary air powder regulating device provided by the present invention; Figure 5 It is a control logic block diagram of the control method of the primary air powder regulating device provided by the present invention.

[0022] Description of Reference Numerals 1-outer ring pulverized coal pipeline; 2-inner ring pulverized coal pipeline; 3-drainage rack; 4-air-powder diversion mechanism; 5-opening adjustment mechanism; 6-controller; 11-air-powder guide ring; 12-flange; 41-air-powder diverter; 42-connecting rod; 51-sealing box; 52-track; 53- baffle; 531- balance groove; 54- roller; 55-driving mechanism; 101-first pulverized coal channel; 201-second pulverized coal channel; 410-windward surface; 501-first regulating mechanism; 502-second regulating mechanism; 511-seal strip; 512-airflow interface; 521-powder discharge hole; 551 - Drive rod. DETAILED DESCRIPTION

[0023] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0024] In the embodiments of the present invention, unless otherwise specified, directional words such as "up, down, left, right" generally refer to the directions or positional relationships shown in the accompanying drawings, or the directions or positional relationships in which the inventive product is usually placed when in use.

[0025] The terms “first”, “second”, “third”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0026] The terms "parallel", "vertical", etc. do not mean that the components must be absolutely parallel or vertical, but can be slightly tilted. For example, "parallel" only means that its direction is more parallel than "vertical", and does not mean that the structure must be completely parallel, but can be slightly tilted.

[0027] The terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal, vertical or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In addition, the terms "roughly" and "basically" are intended to explain that the relevant content does not require absolute precision, but can have certain deviations. For example, "roughly equal" does not only mean absolute equality. Since it is difficult to achieve absolute "equality" in actual production and operation, there are generally certain deviations. Therefore, in addition to absolute equality, "roughly equal" also includes the above-mentioned situation with certain deviations. Taking this as an example, in other cases, unless otherwise specified, the terms "roughly" and "basically" have similar meanings to the above.

[0029] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Figure 1 It is a schematic cross-sectional structure diagram of the primary air powder regulating device provided by the present invention; Figure 2 is a top view of the primary air powder regulating device provided by the present invention; Figure 3 It is a structural schematic diagram of the baffle provided by the present invention; Figure 4 It is a flow chart of a control method of a primary air powder regulating device provided by the present invention; Figure 5 It is a control logic block diagram of the control method of the primary air powder regulating device provided by the present invention.

[0031] This embodiment provides a primary air powder regulating device, such as Figure 1-3 As shown, the device comprises: The outer ring pulverized coal pipeline 1 and the inner ring pulverized coal pipeline 2 both have an internal accommodation space. The inner ring pulverized coal pipeline 2 is arranged in the internal accommodation space of the outer ring pulverized coal pipeline 1 through at least one guide frame plate 3. The outer wall of the inner ring pulverized coal pipeline 2 and the inner wall of the outer ring pulverized coal pipeline 1 form a first pulverized coal channel 101, and the internal accommodation space of the inner ring pulverized coal pipeline 2 serves as a second pulverized coal channel 201. The air-powder flow dividing mechanism 4 is arranged on the guide frame plate 3 and is located below the inner ring coal powder pipeline 2, and is used to divide the primary air-powder flow into the first coal powder channel 101 and the second coal powder channel 201, and the coal powder concentration of the primary air-powder flow in the first coal powder channel 101 is greater than the coal powder concentration of the primary air-powder flow in the second coal powder channel 201; The opening adjustment mechanism 5 is arranged on the outer ring pulverized coal pipeline 1 and is used to adjust the opening of the first pulverized coal channel 101 to adjust the primary air velocity and the pulverized coal concentration.

[0032] Specifically, in this embodiment, the outer ring coal powder pipeline 1 and the inner ring coal powder pipeline 2 can be circular pipelines or square pipelines, the diameter of the inner ring coal powder pipeline 2 is smaller than the diameter of the outer ring coal powder pipeline 1, and the inner ring coal powder pipeline 2 and the outer ring coal powder pipeline 1 are arranged in a coaxial manner. After the primary air and powder pass through the dynamic (static) separator, the air and powder airflow spirally rises, and under the combined action of inertial force and centrifugal force, most of the coal powder is distributed on the periphery of the airflow. The air and powder diversion mechanism 4 is arranged below the inner ring coal powder pipeline 2, so that after the rotating and rising primary air and powder airflow flows through the frontal surface of the air and powder diversion mechanism 4, due to the different inertial forces of air and coal powder particle media, the dense phase coal powder is guided to the first coal powder channel 101, and the dilute phase air and powder is guided to the second coal powder channel 201, so that the coal powder concentration of the primary air and powder airflow in the first coal powder channel 101 is greater than the coal powder concentration of the primary air and powder airflow in the second coal powder channel 201. Therefore, by adjusting the opening of the first pulverized coal channel 101 through the opening adjustment mechanism 5 , the primary air velocity and pulverized coal concentration can be adjusted quickly and efficiently. The air-powder velocity in the inner ring pulverized coal pipeline 2 is adaptively adjusted according to the resistance change of the first pulverized coal channel 101 .

[0033] Preferably, the outer ring pulverized coal pipeline 1 has the same outer diameter and wall thickness as the pulverized coal pipeline connected to it, the second pulverized coal channel 201 circulates a dilute phase primary air-powder medium (with an air-to-coal ratio of approximately 7:3), the first pulverized coal channel 101 circulates a dense phase primary air-powder medium (with an air-to-coal ratio of approximately 3:7), and the area ratio of the inner ring pulverized coal pipeline 2 to the outer ring pulverized coal pipeline 1 is 6:4 or 5:5; the guide frame plates 3 are arranged in four pieces and are distributed in a cross-shaped structure. When the primary air and powder enter, the dense phase air-powder medium is rectified to reduce the tangential rotation speed of the air and powder, so that the dense phase air and powder enter the first pulverized coal channel 101 vertically, which is beneficial to enhancing the adjustment effect of the opening adjustment mechanism 5.

[0034] Among them, the outer ring pulverized coal pipeline 1, the inner ring pulverized coal pipeline 2, the guide frame plate 3 and the air-powder diversion mechanism 4 can be integrally cast using wear-resistant SiC material to ensure structural strength.

[0035] In one embodiment, an air-powder guide ring 11 is provided on the inner wall of the outer ring coal powder pipeline 1 to reduce the friction of coal powder in the primary air-powder airflow on the inner wall of the outer ring coal powder pipeline 1. In this way, the air-powder guide ring 11 is provided to protrude outward relative to the inner wall of the outer ring coal powder pipeline 1, so that the primary air-powder airflow in the first coal powder channel 101 is guided to the middle area of ​​the outer ring coal powder pipeline 1, reducing the wear of coal powder on the inner wall of the outer ring coal powder pipeline 1, and at the same time, the dilute phase coal powder in the second coal powder channel 201 is fully mixed with the dense phase coal powder in the first coal powder channel 101. Preferably, the outer ring coal powder pipeline 1 and the air-powder guide ring 11 are integrally cast SiC material, and the air-powder guide ring 11 occupies 10% of the cross-sectional size of the outer ring coal powder pipeline 1 of the first coal powder channel 101.

[0036] In one embodiment, the air-powder diverter mechanism 4 includes: an air-powder diverter 41, which is connected to the guide frame 3 through at least one connecting rod 42, and the air-powder diverter 41 is located directly below the inner ring coal powder pipeline 2, and the windward surface 410 of the air-powder diverter 41 is an arc surface.

[0037] Preferably, an air-powder splitter 41 is arranged below the inner ring coal powder pipeline 2. The air-powder splitter 41 is an overall low-resistance raindrop-shaped structure. After the rotating and rising primary air-powder airflow flows through the curved windward surface 410, due to the different inertia forces of air and coal powder particle medium, the dense phase coal powder is guided to the first coal powder channel 101, and the dilute phase air-powder is guided to the second coal powder channel 201. The second coal powder channel 201 circulates the dilute phase primary air-powder medium, and the first coal powder channel 101 circulates the dense phase primary air-powder medium. Moreover, most of the primary air volume circulates in the second coal powder channel 201. The device has little effect on the resistance of the primary air duct. The connecting rods 42 are set to 4 symmetrical ones to ensure the structural strength.

[0038] In one embodiment, the opening adjustment mechanism 5 includes: a first adjustment mechanism 501 and a second adjustment mechanism 502. The first adjustment mechanism 501 and the second adjustment mechanism 502 have the same structure and are relatively arranged on the outer ring coal powder pipeline 1. In order to improve the accuracy of control, the first adjustment mechanism 501 and the second adjustment mechanism 502 are arranged to run synchronously. The first adjustment mechanism 501 and the second adjustment mechanism 502 both include: The sealing box 51 is hollow inside and has an open structure at the fixed end. The sealing box 51 is fixedly arranged on the outer ring coal powder pipeline 1 through the fixed end. The sealing box 51 and the outer ring coal powder pipeline 1 are sealed and connected. A through groove is provided at a position corresponding to the sealing box 51 on the outer ring coal powder pipeline 1, so that the inside of the sealing box 51 is connected with the first coal powder channel 101, which serves as a channel for the movement of the baffle 53. The track 52 is relatively arranged in the sealing box 51; The baffle 53 is slidably arranged on the track 52 through the roller 54. Under the action of the driving force, the roller 54 can roll along the track 52, thereby realizing the sliding of the baffle 53 to adjust the opening of the first pulverized coal channel 101. The baffle 53 is made of SiC; The driving mechanism 55 is arranged on the sealing box 51. The driving rod 551 of the driving mechanism 55 passes through the sealing box 51 and is connected to the baffle 53 to generate the driving force. The driving rod 551 is connected to the sealing box 51 in a dynamic sealing manner to prevent the primary air and powder airflow from leaking outward. Preferably, the driving mechanism 55 can be set as a telescopic rod (such as an electric cylinder, a hydraulic cylinder, etc.), and the driving rod 551 of the driving mechanism 55 is connected to the baffle 53 to achieve force transmission. The driving rod 551 can be set as an L-shaped structure; in addition, in order to ensure that the primary air and powder airflow is prevented from leaking outward, the driving rod 551 is connected to the sealing box 51 in a dynamic sealing manner.

[0039] More specifically, when the outer ring pulverized coal pipeline 1 and the inner ring pulverized coal pipeline 2 are circular pipelines, the first pulverized coal channel 101 is a circular ring structure, and correspondingly, the baffle 53 also adopts a circular ring structure; when the outer ring pulverized coal pipeline 1 and the inner ring pulverized coal pipeline 2 are square pipelines, the baffle 53 also adopts a U-shaped structure.

[0040] In another embodiment, in order to prevent the accumulation of coal powder on the baffle 53, the opening adjustment mechanism 5 is tilted on the outer ring coal powder pipeline 1, and the tilt angle is 30 degrees to 45 degrees, so that the baffle 53 is arranged in a V-shaped structure, thereby increasing the effective action distance of the baffle 53 in the dense phase wind and powder cross section, and the change range of the coal powder concentration and wind speed during the adjustment process is smoother, and the control accuracy is higher. In addition, the coal powder retained in the sealing box 51 flows to the first coal powder channel 101 under the action of gravity, which has a good self-cleaning function. The upper end surface of the corresponding guide frame 3 has the same tilt angle as the baffle 53.

[0041] In one embodiment, a plurality of sealing strips 511 are arranged at intervals in the sealing box 51, and the sealing strips 511 are in contact with the surface of the baffle 53 to prevent the coal powder from entering the sealing box 51; In one embodiment, although a plurality of sealing strips 511 are arranged at intervals in the sealing box 51 to block the coal powder, the coal powder cannot be completely blocked. Therefore, an airflow interface 512 is provided at the end of the sealing box 51 close to the driving mechanism 55 to connect the airflow and blow the coal powder in the sealing box 51 into the first coal powder channel 101 to prevent the coal powder from gathering in the sealing box 51 and affecting the normal movement of the baffle 53. In one embodiment, although the coal powder is blocked by arranging a plurality of sealing strips 511 at intervals in the sealing box 51, since the coal powder cannot be completely blocked, part of the coal powder will be deposited on the track 52. Therefore, a plurality of powder discharge holes 521 are arranged at intervals on the track 52 to discharge the coal powder on the track 52 into the sealing box 51 to avoid affecting the normal movement of the roller 54.

[0042] In one embodiment, a plurality of balancing grooves 531 are provided on the baffle 53 to balance the pressure on the upper and lower surfaces of the baffle 53 and to prevent the deposition of coal powder on the upper surface of the baffle 53. Preferably, the balancing grooves 531 may be of a rectangular structure, and the balancing grooves 531 occupy 10% of the area of ​​the baffle 53, to ensure that the pressure on the upper and lower surfaces of the baffle 53 is relatively balanced, and at the same time, when the airflow passes through the balancing grooves 531 upward, the coal powder can be purged, and the deposition of coal powder on the upper surface of the baffle 53 can be prevented.

[0043] In one embodiment, the device further comprises: A set of air-powder velocity measurement sensors and concentration measurement sensors are installed on the primary powder pipe downstream of the air-powder regulating device to measure the wind speed of the primary air powder collected on the primary powder pipe and the coal powder concentration in the primary air powder; The controller 6 is connected to the driving mechanism 55, the speed measuring sensor, and the concentration measuring sensor, and is used to control the driving mechanism 55 to drive the baffle 53 to move based on the wind speed of the primary air powder collected on the primary powder pipe and the coal powder concentration in the primary air powder, so as to change the opening of the first coal powder channel 101. In the above manner, the controller 6 automatically controls the driving mechanism 55 by collecting the wind speed of the primary air powder collected on the primary powder pipe and the coal powder concentration in the primary air powder, thereby automatically adjusting the opening of the first coal powder channel 101, so that the wind speed of the primary air powder collected on the primary powder pipe and the coal powder concentration in the primary air powder meet the requirements.

[0044] In one embodiment, flanges 12 are provided at both ends of the outer ring pulverized coal pipeline 1, and corresponding flanges are also provided on the primary pulverized coal pipeline. The flanges can ensure the sealing of the connection parts and achieve rapid installation and disassembly.

[0045] This embodiment also provides a control method for a primary air powder regulating device, which is applied to the primary air powder regulating device mentioned above. Figure 4-5 As shown, the method includes: Obtain the wind speed of the primary air powder collected on the primary powder pipe and the coal powder concentration in the primary air powder; Based on the wind speed and the preset wind speed, a wind speed deviation is calculated; and based on the coal powder concentration and the preset coal powder concentration, a coal powder concentration deviation is calculated; If the wind speed deviation or the coal powder concentration deviation is greater than a first set threshold, the opening adjustment mechanism is controlled to reduce the opening of the first coal powder channel at a first preset rate, and the deviation change rate of the wind speed deviation or the coal powder concentration deviation is obtained in real time. If the deviation change rate is greater than a set change rate threshold, the opening adjustment mechanism is controlled to reduce the opening of the first coal powder channel at a second preset rate until the wind speed deviation or the coal powder concentration deviation is less than the first set threshold; If the wind speed deviation or the coal powder concentration deviation is less than a second set threshold, the opening adjustment mechanism is controlled to increase the opening of the first coal powder channel at a first preset rate, and the deviation change rate of the wind speed deviation or the coal powder concentration deviation is obtained in real time. If the deviation change rate is greater than a set change rate threshold, the opening adjustment mechanism is controlled to increase the opening of the first coal powder channel at a second preset rate until the wind speed deviation or the coal powder concentration deviation is greater than the second set threshold; The first preset rate is greater than the second preset rate.

[0046] Specifically, the air-powder regulating device is installed on the primary powder pipe at the outlet of the coal mill separator, and each primary powder pipe is provided with an air-powder regulating device to adjust the primary air velocity and coal powder concentration of each primary powder pipe, so that the deviation of the primary air velocity and coal powder concentration of all primary powder pipes is within the set range. By synchronously controlling the opening adjustment mechanism (i.e., the first adjustment mechanism and the second adjustment mechanism) in the above manner, the primary air velocity and coal powder concentration can be accurately adjusted, so that the control is accurate, the fluctuation is small, the coal powder is evenly distributed, the uniformity of the heat load distribution in the boiler furnace is improved, the combustion effect is improved, and the safety of operation is guaranteed.

[0047] More specifically, in another embodiment, corresponding judgment thresholds are set for the wind speed deviation and the coal powder concentration deviation respectively; that is: When the wind speed deviation is greater than the first set sub-threshold, the opening adjustment mechanism is controlled to reduce the opening of the first pulverized coal channel at a first preset rate, and the deviation change rate of the wind speed deviation is obtained in real time. If the deviation change rate is greater than the first set change rate sub-threshold, the opening adjustment mechanism is controlled to reduce the opening of the first pulverized coal channel at a second preset rate until the wind speed deviation is less than the first sub-set sub-threshold; When the coal powder concentration deviation is greater than the second set sub-threshold, the opening adjustment mechanism is controlled to reduce the opening of the first coal powder channel at a first preset rate, and the deviation change rate of the coal powder concentration deviation is obtained in real time. If the deviation change rate is greater than the second set change rate sub-threshold, the opening adjustment mechanism is controlled to reduce the opening of the first coal powder channel at the second preset rate until the wind speed deviation is less than the second sub-set sub-threshold; When the wind speed deviation is less than the third set sub-threshold, the opening adjustment mechanism is controlled to increase the opening of the first pulverized coal channel at a first preset rate, and the deviation change rate of the wind speed deviation is obtained in real time. If the deviation change rate is greater than the third set change rate sub-threshold, the opening adjustment mechanism is controlled to increase the opening of the first pulverized coal channel at a second preset rate until the wind speed deviation is greater than the third set sub-threshold; When the coal powder concentration deviation is less than the fourth set sub-threshold, the opening adjustment mechanism is controlled to increase the opening of the first coal powder channel at a first preset rate, and the deviation change rate of the coal powder concentration deviation is obtained in real time. If the deviation change rate is greater than the fourth set change rate sub-threshold, the opening adjustment mechanism is controlled to increase the opening of the first coal powder channel at a second preset rate until the coal powder concentration deviation is greater than the fourth set sub-threshold; Among them, the first setting sub-threshold is greater than the third setting sub-threshold; the second setting sub-threshold is greater than the fourth setting sub-threshold.

[0048] In a specific implementation, the controller constitutes an automatic control system, and the primary air-powder velocity and concentration measuring device can adopt the non-contact electrostatic induction principle or the plug-in charge induction principle; the automatic control system controls the air-powder regulating device based on the primary air-powder velocity and concentration measurement results, firstly calculating the wind speed and coal powder concentration deviations of each powder pipe at the outlet of the same coal mill, and when the wind speed deviation in a single powder pipe is calculated to be ≥±10% or the coal powder concentration deviation is ≥±10%, an adjustment instruction is issued according to the control strategy and control logic. When the deviation of the primary wind speed or coal powder concentration is ≥10%, an instruction to close the corresponding powder pipe regulating damper is issued, and the regulating damper is inserted into the outer ring coal powder pipeline at a speed of 20mm / min. When the wind speed or concentration deviation change rate is greater than 10% / min, the regulating damper is inserted into the outer ring coal powder pipeline at a speed of 10mm / min until the deviation of the primary wind speed and coal powder concentration of each powder pipe at the same mill outlet is less than ±10%, and the adjustment is completed; when the deviation of the primary wind speed or coal powder concentration is ≥-10%, an instruction to open the corresponding powder pipe regulating damper is issued, and the regulating damper leaves the outer ring coal powder pipeline at a speed of 20mm / min. When the wind speed or concentration deviation change rate is greater than 10% / min, the regulating damper leaves the outer ring coal powder pipeline at a speed of 10mm / min until the deviation of the primary wind speed and coal powder concentration of each powder pipe at the same mill outlet is less than ±10%, and the adjustment is completed. In addition, when the primary wind speed and coal powder concentration cannot meet the set deviation at the same time, the coal powder concentration deviation is prioritized, and the primary wind speed deviation is guaranteed to be ≯±15%.

[0049] The embodiment of the present invention further provides a readable storage medium, on which instructions are stored, and the instructions are used to enable a machine to execute the control method of the primary air powder regulating device mentioned above.

[0050] The optional implementation modes of the embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above implementation modes. Within the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical scheme of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.

[0051] Those skilled in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including several instructions for making a single-chip microcomputer, a chip or a processor (processor) perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0052] The optional embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the technical concept of the embodiments of the present invention, the technical scheme of the embodiments of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the embodiments of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations. In addition, various implementations of the embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed in the embodiments of the present invention.

Claims

1. A primary air powder regulating device, characterized in that: The device comprises: An outer ring pulverized coal pipeline (1) and an inner ring pulverized coal pipeline (2), the inner ring pulverized coal pipeline (2) being arranged in an internal accommodation space of the outer ring pulverized coal pipeline (1) via at least one guide frame plate (3), a first pulverized coal channel (101) being formed between an outer wall of the inner ring pulverized coal pipeline (2) and an inner wall of the outer ring pulverized coal pipeline (1), and the internal accommodation space of the inner ring pulverized coal pipeline (2) serving as a second pulverized coal channel (201); an air-powder flow splitting mechanism (4) arranged on the guide frame (3) and located below the pipe opening of the inner ring pulverized coal pipeline (2), and used for splitting the primary air-powder flow entering the outer ring pulverized coal pipeline (1) into the first pulverized coal channel (101) and the second pulverized coal channel (201), wherein the pulverized coal concentration of the primary air-powder flow in the first pulverized coal channel (101) is greater than the pulverized coal concentration of the primary air-powder flow in the second pulverized coal channel (201); An opening adjustment mechanism (5) is arranged on the outer ring pulverized coal pipeline (1) and is used to adjust the opening of the first pulverized coal channel (101) to adjust the primary air velocity and pulverized coal concentration.

2. The primary air powder regulating device according to claim 1, characterized in that: An air-powder guide ring (11) is provided on the inner wall of the outer ring coal powder pipeline (1) to reduce the friction of coal powder in the primary air-powder airflow on the inner wall of the outer ring coal powder pipeline (1).

3. The primary air powder regulating device according to claim 1, characterized in that: The air-powder diversion mechanism (4) comprises: The air-powder splitter (41) is connected to the guide frame (3) via at least one connecting rod (42); the air-powder splitter (41) is located directly below the pipe opening of the inner ring coal powder pipeline (2); and the windward surface (410) of the air-powder splitter (41) is an arc-shaped surface.

4. The primary air powder regulating device according to claim 1, characterized in that: The opening adjustment mechanism (5) comprises: a first adjustment mechanism (501) and a second adjustment mechanism (502) arranged opposite to each other, wherein the first adjustment mechanism (501) and the second adjustment mechanism (502) each comprise: A sealing box (51) is fixedly arranged on the outer ring pulverized coal pipeline (1), the sealing box (51) is in communication with the first pulverized coal channel (101), and tracks (52) are arranged opposite to each other in the sealing box (51); a baffle (53) slidably disposed on the track (52) via a roller (54) and configured to slide along the track (52) under the action of a driving force to adjust the opening of the first pulverized coal channel (101); A driving mechanism (55) is arranged on the sealing box (51); a driving rod (551) of the driving mechanism (55) passes through the sealing box (51) and is connected to the baffle (53) for generating the driving force; the driving rod (551) is connected to the sealing box (51) in a dynamic sealing manner to prevent the primary air and powder air flow from leaking outwards.

5. The primary air powder regulating device according to claim 4, characterized in that: A plurality of sealing strips (511) are arranged at intervals in the sealing box (51) to prevent coal powder from entering the sealing box (51); An airflow interface (512) is provided at the end of the sealing box (51) close to the driving mechanism (55) for receiving airflow to blow the coal powder in the sealing box (51) into the first coal powder channel (101); A plurality of powder discharge holes (521) are arranged at intervals on the track (52) so as to discharge the coal powder on the track (52) into the sealing box (51).

6. The primary air powder regulating device according to claim 4, characterized in that: The baffle (53) is provided with a plurality of balancing grooves (531) to balance the pressure on the upper surface and the lower surface of the baffle (53) and to prevent coal powder from being deposited on the upper surface of the baffle (53).

7. The primary air powder regulating device according to claim 4, characterized in that: The device also includes: A controller (6) is connected to a control end of the driving mechanism (55) and is used to control the driving mechanism (55) to drive the baffle (53) to move based on the wind speed of the primary air powder collected on the primary powder pipe and the coal powder concentration in the primary air powder, so as to change the opening of the first coal powder channel (101).

8. The primary air powder regulating device according to claim 1, characterized in that: Both ends of the outer ring pulverized coal pipeline (1) are provided with flanges (12).

9. A control method for a primary air powder regulating device, applied to the primary air powder regulating device according to any one of claims 1 to 8, characterized in that: The method comprises: Obtain the wind speed of the primary air powder collected on the primary powder pipe and the coal powder concentration in the primary air powder; Based on the wind speed and the preset wind speed, a wind speed deviation is calculated; and based on the coal powder concentration and the preset coal powder concentration, a coal powder concentration deviation is calculated; If the wind speed deviation or the coal powder concentration deviation is greater than a first set threshold, the opening adjustment mechanism is controlled to reduce the opening of the first coal powder channel at a first preset rate, and the deviation change rate of the wind speed deviation or the coal powder concentration deviation is obtained in real time. If the deviation change rate is greater than a set change rate threshold, the opening adjustment mechanism is controlled to reduce the opening of the first coal powder channel at a second preset rate until the wind speed deviation or the coal powder concentration deviation is less than the first set threshold; If the wind speed deviation or the coal powder concentration deviation is less than a second set threshold, the opening adjustment mechanism is controlled to increase the opening of the first coal powder channel at a first preset rate, and the deviation change rate of the wind speed deviation or the coal powder concentration deviation is obtained in real time. If the deviation change rate is greater than a set change rate threshold, the opening adjustment mechanism is controlled to increase the opening of the first coal powder channel at a second preset rate until the wind speed deviation or the coal powder concentration deviation is greater than the second set threshold; The first preset rate is greater than the second preset rate.

10. A readable storage medium having instructions stored thereon, the instructions being used to enable a machine to execute the control method of the primary air powder regulating device according to claim 9.

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