Pulverized coal automatic sampling on-line screening fineness measuring device

Abstract

The invention relates to the technical field of pulverized coal measurement, in particular to a pulverized coal automatic sampling on-line screening fineness measuring device which comprises a measuring assembly and a control assembly. Comprising a pulverized coal pipeline, a sampling piece arranged on the pulverized coal pipeline, a screening piece arranged on the sampling piece, a coarse pulverized coal guide piece arranged on the screening piece, and a fine pulverized coal guide piece arranged on the screening piece and the coarse pulverized coal guide piece, the metering piece is arranged on the fine pulverized coal guiding piece; the drainage piece is arranged on the metering piece and the pulverized coal pipeline; the recycling assembly comprises a circulating part which is arranged on the metering part; the device has the advantages that the screening part, the metering part and the circulating part are arranged, the fineness of pulverized coal measured through automatic sampling and online screening of the device is high in precision, the situation that workers depend on an offline pulverized coal fineness detection method and experience of the workers is avoided, and the situation that the workers cannot master changes of the fineness of the pulverized coal in time, and consequently measurement errors are increased is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of coal powder measurement, in particular to a coal powder automatic sampling and online screening fineness measurement device. Background Art

[0002] The pulverized coal furnace is a boiler combustion equipment in a thermal power plant. The pulverized coal is transported into the furnace by air and burned in a suspended state. The advantages of this combustion are fast speed, large capacity, high efficiency, adaptability to a wide range of coal types, and easy control and adjustment. However, in the process of transporting the pulverized coal to the furnace by air, the flow conditions of the pulverized coal and air in a mixed state are complicated, and the fineness of the pulverized coal has a significant impact on the combustion efficiency and the generation of combustion pollutants.

[0003] If the actual coal powder fineness deviates greatly from the designed coal powder fineness, it will not only cause boiler safety operation problems such as boiler fire extinguishing and high-temperature corrosion, but also cause the center of the furnace flame to move upward, and the carbon content in the ash to increase, which will cause the denitrification catalyst to be blocked and lead to an increase in the generation of combustion pollutants. At present, the monitoring and control of coal powder fineness in coal-fired power plants mainly rely on offline coal powder fineness detection methods and the adjustment experience of staff, resulting in the staff's inability to grasp the changes in coal powder fineness in a timely manner and increase measurement errors. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention is proposed.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a coal powder automatic sampling online screening fineness measurement device, which comprises:

[0006] A measuring component includes a pulverized coal pipeline, a sampling member arranged on the pulverized coal pipeline, a screening member arranged on the sampling member, a coarse pulverized coal guide member arranged on the screening member, a fine pulverized coal guide member arranged on the screening member and the coarse pulverized coal guide member, a metering member arranged on the fine pulverized coal guide member, and a drainage member arranged on the metering member and the pulverized coal pipeline; and a recovery component includes a circulation member arranged on the metering member and a return member arranged on the metering member and the drainage member.

[0007] As a preferred solution described in the present invention, the sampling component includes a first sampling tube that penetrates the coal powder pipeline and is fixedly connected to the coal powder pipeline, a sampling valve is provided at one end of the first sampling tube away from the coal powder pipeline, a second sampling tube is provided at one end of the sampling valve away from the first sampling tube, and a coal powder inlet is provided at one end of the second sampling tube away from the sampling valve.

[0008] As a preferred solution described in the present invention, the screening element includes a packaging shell fixedly connected and communicated with the coal powder inlet, a vibrator is provided on the inner wall of the packaging shell, a filter plate that closes the internal space of the packaging shell is provided on the vibrator, and a plurality of filter holes are opened on the filter plate.

[0009] As a preferred solution described in the present invention, the coarse coal powder guide includes a coarse coal powder inlet fixedly connected and communicated with the top of the packaging shell, a coarse coal powder second guide pipe is arranged at the end of the coarse coal powder inlet away from the packaging shell, a coarse coal powder guide valve is arranged at the end of the coarse coal powder second guide pipe away from the coarse coal powder inlet, and a coarse coal powder first guide pipe is arranged at the end of the coarse coal powder guide valve away from the coarse coal powder second guide pipe.

[0010] As a preferred solution described in the present invention, the fine coal powder guide includes a fine coal powder inlet fixedly connected and communicated with the bottom of the packaging shell, a fine coal powder second guide pipe is arranged at one end of the fine coal powder inlet away from the packaging shell, a fine coal powder guide valve is arranged at one end of the fine coal powder second guide pipe away from the fine coal powder inlet, and a fine coal powder first guide pipe is arranged at one end of the fine coal powder guide valve away from the fine coal powder second guide pipe.

[0011] As a preferred solution described in the present invention, one end of the first fine coal powder guide pipe away from the fine coal powder guide valve is fixedly connected and communicated with the first coarse coal powder guide pipe, the measuring part includes a cyclone separator fixedly connected and communicated with the first coarse coal powder guide pipe, and a weighing meter is provided on the bottom inner wall of the cyclone separator.

[0012] As a preferred solution described in the present invention, the drainage member includes a third drainage tube fixedly connected to and communicated with the cyclone separator, a drainage valve is provided at one end of the third drainage tube away from the cyclone separator, and a second drainage tube is provided at one end of the drainage valve away from the third drainage tube.

[0013] As a preferred solution described in the present invention, a negative pressure vacuum pump is arranged at one end of the second drainage pipe away from the drainage valve, a first drainage pipe fixedly connected and communicated with the pulverized coal pipeline is arranged at one end of the negative pressure vacuum pump away from the second drainage pipe, and the circulation part includes a fan.

[0014] As a preferred solution described in the present invention, wherein: a first circulation pipe connected to the fan is fixedly connected, a circulation valve is provided at one end of the first circulation pipe away from the fan, a second circulation pipe is provided at one end of the circulation valve away from the first circulation pipe, and an end of the second circulation pipe away from the circulation valve is fixedly connected to and connected with the cyclone separator.

[0015] As a preferred solution described in the present invention, the return member includes a first return pipe fixedly connected and communicated with the cyclone separator, a return valve is provided at one end of the first return pipe away from the cyclone separator, and a second return pipe fixedly connected and communicated with the second drainage pipe is provided at one end of the return valve away from the first return pipe.

[0016] The beneficial effects of the present invention are as follows: by setting screening parts, metering parts and circulation parts, the coal powder fineness measured by the automatic sampling and online screening of the device is highly accurate, which avoids workers relying on offline coal powder fineness detection methods and their own experience, and prevents workers from failing to grasp the changes in coal powder fineness in time and increasing measurement errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0018] Figure 1 This is a schematic diagram of the planar structure of the coal powder automatic sampling and online screening fineness measurement device.

[0019] Figure 2 for Figure 1 Enlarged structural diagram at A in the middle.

[0020] Figure 3 for Figure 1 Enlarged structural diagram at B in the middle.

[0021] Reference numerals: 100, measuring assembly; 101, pulverized coal pipeline; 102, sampling member; 102a, first sampling tube; 102b, sampling valve; 102c, second sampling tube; 102d, pulverized coal inlet; 103, screening member; 103a, vibrator; 103b, filter plate; 103c, packaging shell; 104, drainage member; 104a, first drainage tube; 104b, negative pressure exhauster; 104c, second drainage tube; 104d, drainage valve; 104e, third drainage tube; 105, measuring member; 105a, cyclone separator; 105b, weighing instrument; 106, coarse pulverized coal guide; 10 6a, first guide pipe for coarse coal powder; 106b, guide valve for coarse coal powder; 106c, second guide pipe for coarse coal powder; 106d, inlet for coarse coal powder; 107, guide member for fine coal powder; 107a, first guide pipe for fine coal powder; 107b, guide valve for fine coal powder; 107c, second guide pipe for fine coal powder; 107d, inlet for fine coal powder; 200, recovery assembly; 201, circulation member; 201a, fan; 201b, first circulation pipe; 201c, circulation valve; 201d, second circulation pipe; 202, return member; 202a, first return pipe; 202b, return valve; 202c, second return pipe. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0025] Example 1

[0026] Reference Figure 1 to Figure 3 , which is the first embodiment of the present invention, provides a device for measuring the fineness of coal powder by automatic sampling and online screening. By setting a screening component 103 and a metering component 105, the coal powder fineness measured by the device through automatic sampling and online screening is highly accurate, avoiding workers from relying on offline coal powder fineness detection methods and their own experience, and preventing workers from failing to grasp the changes in coal powder fineness in time and increasing measurement errors.

[0027] Specifically, the measuring component 100 includes a pulverized coal pipeline 101, a sampling component 102 arranged on the pulverized coal pipeline 101, a screening component 103 arranged on the sampling component 102, a coarse pulverized coal guide 106 arranged on the screening component 103, a fine pulverized coal guide 107 arranged on the screening component 103 and the coarse pulverized coal guide 106, a metering component 105 arranged on the fine pulverized coal guide 107, and a drainage component 104 arranged on the metering component 105 and the pulverized coal pipeline 101; and a recovery component 200 includes a circulation component 201 arranged on the metering component 105 and a return component 202 arranged on the metering component 105 and the drainage component 104.

[0028] The fine coal powder guide 107 is connected with the coarse coal powder guide 106, and the circulation member 201 is connected with the flow guide 104, so that the airflow mixed with coal powder shares a pipe, which is conducive to cost saving.

[0029] In summary, by setting the screening piece 103 and the metering piece 105, the worker first keeps the sampling piece 102, the drainage piece 104, the coarse coal powder guide piece 106, the fine coal powder guide piece 107, the circulation piece 201 and the return piece 202 in a closed state, and records the weight in the metering piece 105 as M0, and then first opens the sampling piece 102, the fine coal powder guide piece 107 and the drainage piece 104, and starts the drainage piece 104 to make the sampling piece 102 inhale the gas mixed with coal powder in the coal powder pipeline 101, and after 3 minutes, the gas mixed with coal powder is screened by the screening piece 103, and the screened fine coal powder enters the metering piece 105 with the gas through the fine coal powder guide piece 107 and part of the coarse coal powder guide piece 106 for solid-gas separation, and the gas returns to the coal powder pipeline 101 through the drainage piece 104, and the fine coal powder falls to the bottom of the metering piece 105. After 3 minutes, the weight of the fine coal powder is weighed as M1;

[0030] Then close the sampling member 102 and the fine coal powder guide member 107 and open the circulation member 201 to open and close the circulation member 201 and the return member 202. The circulation member 201 blows up the fine coal powder in the metering member 105, and flows through the return member 202 through the guide member 104 into the coal powder pipeline 101. Part of the fine coal powder is blown to the top of the metering member 105 by the circulation member 201 and directly returns to the coal powder pipeline 101 through the guide member 104 with the suction force of the guide member 104. After 3 minutes, when there is no fine coal powder in each pipeline, close the circulation member 201 and the return member 202 and open the coarse coal powder guide member 106. The guide member 104 sucks the coarse coal powder retained in the screening member 103 into the coarse coal powder guide member 106, and passes through the solidification of the metering member 105. Gas separation, the gas returns to the pulverized coal pipeline 101 through the guide piece 104, and the coarse coal powder falls to the bottom of the metering piece 105. After 3 minutes, the weight of the coarse coal powder is M2. Then the coarse coal powder guide piece 106 is closed and the circulation piece 201 is opened to open and close the circulation piece 201 and the return piece 202. The circulation piece 201 blows up the coarse coal powder in the metering piece 105, and flows through the guide piece 104 through the return piece 202 into the pulverized coal pipeline 101. Part of the coarse coal powder is blown to the top of the metering piece 105 by the circulation piece 201 and directly returns to the pulverized coal pipeline 101 through the guide piece 104 with the suction force of the guide piece 104. After 3 minutes, there is no coarse coal powder in the pipelines, and the circulation piece 201, the return piece 202 and the guide piece 104 are closed.

[0031] Calculation of coal powder fineness: the weight of fine coal powder is M1-M0, and the weight of coarse coal powder is M2-M0. The coal powder fineness value can be calculated as (M1-M0) / (M1+M2-2M0)×100%. The coal powder fineness measured by automatic sampling and online screening by the device is highly accurate, which avoids workers relying on offline coal powder fineness detection methods and their own experience, and prevents workers from failing to grasp the changes in coal powder fineness in time and increasing measurement errors.

[0032] Example 2

[0033] Reference Figure 1 to Figure 3 , which is the second embodiment of the present invention, is based on the previous embodiment, and the difference is that by setting the screening part 103, the metering part 105 and the circulating part 201, the coal powder fineness measured by the automatic sampling and online screening of the device is highly accurate, avoiding workers from relying on offline coal powder fineness detection methods and their own experience, and preventing workers from failing to grasp the changes in coal powder fineness in time and increasing measurement errors.

[0034] Specifically, the sampling component 102 includes a first sampling tube 102a that penetrates the pulverized coal pipeline 101 and is fixedly connected to the pulverized coal pipeline 101, a sampling valve 102b is provided at one end of the first sampling tube 102a away from the pulverized coal pipeline 101, a second sampling tube 102c is provided at one end of the sampling valve 102b away from the first sampling tube 102a, and a pulverized coal inlet 102d is provided at one end of the second sampling tube 102c away from the sampling valve 102b.

[0035] The screening element 103 includes a packaging shell 103c fixedly connected and communicated with the coal powder inlet 102d, a vibrator 103a is arranged on the inner wall of the packaging shell 103c, a filter plate 103b is arranged on the vibrator 103a to seal the inner space of the packaging shell 103c, and a plurality of filter holes are opened on the filter plate 103b.

[0036] The coarse coal powder guide 106 includes a coarse coal powder inlet 106d fixedly connected and communicated with the top of the packaging shell 103c, a coarse coal powder second guide pipe 106c is provided at one end of the coarse coal powder inlet 106d away from the packaging shell 103c, a coarse coal powder guide valve 106b is provided at one end of the coarse coal powder second guide pipe 106c away from the coarse coal powder inlet 106d, and a coarse coal powder first guide pipe 106a is provided at one end of the coarse coal powder guide valve 106b away from the coarse coal powder second guide pipe 106c.

[0037] The fine coal powder guide 107 includes a fine coal powder inlet 107d fixedly connected and communicated with the bottom of the packaging shell 103c, a fine coal powder second guide pipe 107c is provided at one end of the fine coal powder inlet 107d away from the packaging shell 103c, a fine coal powder guide valve 107b is provided at one end of the fine coal powder second guide pipe 107c away from the fine coal powder inlet 107d, and a fine coal powder first guide pipe 107a is provided at one end of the fine coal powder guide valve 107b away from the fine coal powder second guide pipe 107c.

[0038] One end of the first fine coal powder guide pipe 107a away from the fine coal powder guide valve 107b is fixedly connected and communicated with the first coarse coal powder guide pipe 106a, and the metering member 105 includes a cyclone separator 105a fixedly connected and communicated with the first coarse coal powder guide pipe 106a, and a weighing meter 105b is provided on the bottom inner wall of the cyclone separator 105a.

[0039] The drainage member 104 includes a third drainage pipe 104e fixedly connected and communicated with the cyclone separator 105a. A drainage valve 104d is provided at one end of the third drainage pipe 104e away from the cyclone separator 105a. A second drainage pipe 104c is provided at one end of the drainage valve 104d away from the third drainage pipe 104e.

[0040] A negative pressure vacuum pump 104b is provided at one end of the second drainage pipe 104c away from the drainage valve 104d, and a first drainage pipe 104a fixedly connected and communicated with the pulverized coal pipeline 101 is provided at one end of the negative pressure vacuum pump 104b away from the second drainage pipe 104c. The circulation part 201 includes a fan 201a.

[0041] Among them, the pipelines and valves are made of corrosion-resistant and wear-resistant materials to ensure long-term stable sampling. The coal powder inlet 102d, the coarse coal powder inlet 106d and the fine coal powder inlet 107d are all funnel-shaped to improve the fault tolerance of powder feeding and discharge. The sample screen adopts the R90 model circular screen. The weighing meter 105b occupies the bottom inner wall of the cyclone separator 105a and the side wall of the weighing meter 105b is in contact with the inner side wall of the weighing meter 105b.

[0042] The coal powder inlet 102d and the second sampling tube 102c are hingedly connected, and a rubber ring that can close the gap is fixedly sleeved between the coal powder inlet 102d and the second sampling tube 102c, which is conducive to the screening element 103 driving the coal powder inlet 102d to vibrate when vibrating, so that the coal powder on the inner wall of the coal powder inlet 102d falls into the screening element 103.

[0043] The coarse coal powder inlet 106d and the coarse coal powder second guide pipe 106c are hingedly connected, and a rubber ring that can close the gap is fixedly sleeved between the coarse coal powder inlet 106d and the coarse coal powder second guide pipe 106c, which is conducive to the coarse coal powder inlet 106d to vibrate when the screening element 103 vibrates, so that the coal powder on the inner wall of the coarse coal powder inlet 106d falls into the screening element 103.

[0044] The fine coal powder inlet 107d and the fine coal powder second guide tube 107c are hingedly connected, and a rubber ring that can close the gap is fixedly sleeved between the fine coal powder inlet 107d and the fine coal powder second guide tube 107c, which is conducive to the screening element 103 driving the fine coal powder inlet 107d to vibrate when vibrating, so that the coal powder on the inner wall of the fine coal powder inlet 107d falls into the screening element 103.

[0045] In summary, by setting the screening element 103, the metering element 105 and the circulation element 201, the worker first keeps the sampling element 102, the drainage element 104, the coarse coal powder guide element 106, the fine coal powder guide element 107, the circulation element 201 and the return element 202 in a closed state, and records the weight on the weighing instrument 105b as M0, and then first unscrews the sampling valve 102b, the fine coal powder guide valve 107b and the drainage valve 104d and starts the negative pressure exhauster 104b to make the first sampling tube 102a, the sampling valve 102b, the second sampling tube 102c and the coal powder inlet 102d suck the gas mixed with coal powder in the coal powder pipeline 101, and after 3 minutes, the gas mixed with coal powder passes through the packaging Shell 103c falls on the top of filter plate 103b and screens fine coal powder under the vibration of vibrator 103a. The screened fine coal powder passes through fine coal powder inlet 107d, fine coal powder second guide pipe 107c, fine coal powder guide valve 107b, fine coal powder first guide pipe 107a and coarse coal powder first guide pipe 106a with gas to enter cyclone separator 105a for solid-gas separation. The gas passes through third drainage pipe 104e, drainage valve 104d, second drainage pipe 104c, negative pressure exhauster 104b and first drainage pipe 104a to return to coal powder pipeline 101, while fine coal powder falls on weighing instrument 105b. After 3 minutes, the weight of fine coal powder is M1.

[0046] Then close the sampling valve 102b and the fine coal powder guide valve 107b, start the fan 201a, open the circulation valve 201c and the return valve 202b, and the fan 201a blows up the fine coal powder on the weighing instrument 105b through the first circulation pipe 201b, the circulation valve 201c and the second circulation pipe 201d, and flows through the first return pipe 202a, the return valve 202b and the second return pipe 202c through the second drainage pipe 104c and the negative pressure exhauster 104b and the first drainage pipe 104a into the coal powder pipeline 101. Part of the fine coal powder is blown to the top of the weighing instrument 105b by the fan 201a and is discharged along with the negative pressure exhauster 104 b directly returns to the pulverized coal pipeline 101 from the third drainage pipe 104e, the drainage valve 104d, the second drainage pipe 104c, the negative pressure vacuum pump 104b and the first drainage pipe 104a. After 3 minutes, when there is no fine coal powder in each pipeline, the fan 201a, the circulation valve 201c and the return valve 202b are closed and the coarse coal powder guide valve 106b is opened. The negative pressure vacuum pump 104b sucks the coarse coal powder retained on the top of the filter plate 103b into the coarse coal powder inlet 106d and enters the cyclone separator 105a through the coarse coal powder second guide pipe 106c, the coarse coal powder guide valve 106b and the coarse coal powder first guide pipe 106a for solid-gas separation. , the gas returns to the pulverized coal pipeline 101 through the third drainage pipe 104e, the drainage valve 104d, the second drainage pipe 104c, the negative pressure exhauster 104b and the first drainage pipe 104a, and the coarse pulverized coal falls on the weighing instrument 105b. After 3 minutes, the weight of the coarse pulverized coal is M2. Then the coarse pulverized coal guide valve 106b is closed, the fan 201a is started, and the circulation valve 201c and the return valve 202b are opened. The fan 201a blows up the coarse pulverized coal on the weighing instrument 105b through the first circulation pipe 201b, the circulation valve 201c and the second circulation pipe 201d, and passes through the first return pipe 202a, the return valve 202b and The second return pipe 202c flows through the second drainage pipe 104c and passes through the negative pressure vacuum pump 104b and the first drainage pipe 104a into the pulverized coal pipeline 101. Part of the coarse pulverized coal is blown to the top of the weighing instrument 105b by the fan 201a and returns to the pulverized coal pipeline 101 directly from the third drainage pipe 104e, the drainage valve 104d, the second drainage pipe 104c, the negative pressure vacuum pump 104b and the first drainage pipe 104a with the suction force of the negative pressure vacuum pump 104b. After 3 minutes, there is no coarse pulverized coal in the pipelines, and the fan 201a, the circulation valve 201c, the return valve 202b, the drainage valve 104d and the negative pressure vacuum pump 104b are closed.

[0047] Calculation of coal powder fineness: the weight of fine coal powder is M1-M0, and the weight of coarse coal powder is M2-M0. The coal powder fineness value can be calculated as (M1-M0) / (M1+M2-2M0)×100%. The coal powder fineness measured by automatic sampling and online screening by the device is highly accurate, which avoids workers relying on offline coal powder fineness detection methods and their own experience, and prevents workers from failing to grasp the changes in coal powder fineness in time and increasing measurement errors.

[0048] Example 3

[0049] Reference Figure 1 to Figure 3 , which is the third embodiment of the present invention, is based on the previous embodiment, except that a circulation member 201 and a return member 202 are provided. The benefit of such a provision is that it not only recycles coal powder and saves costs, but also prevents coal powder from leaking and polluting the surrounding environment.

[0050] Specifically, a first circulation pipe 201b connected to the fan 201a is fixedly connected, a circulation valve 201c is provided at one end of the first circulation pipe 201b away from the fan 201a, a second circulation pipe 201d is provided at one end of the circulation valve 201c away from the first circulation pipe 201b, and one end of the second circulation pipe 201d away from the circulation valve 201c is fixedly connected and connected to the cyclone separator 105a.

[0051] The return member 202 includes a first return pipe 202a fixedly connected and communicated with the cyclone separator 105a, a return valve 202b is provided at one end of the first return pipe 202a away from the cyclone separator 105a, and a second return pipe 202c fixedly connected and communicated with the second drainage pipe 104c is provided at one end of the return valve 202b away from the first return pipe 202a.

[0052] The second circulation pipe 201d and the first return pipe 202a are at the same level, which is beneficial for the airflow to flow in a straight line and quickly when the fan 201a blows the coal powder on the weighing instrument 105b.

[0053] In summary, by setting the circulation part 201 and the return part 202, when the coal powder falls on the weighing meter 105b, the fan 201a is started and the first circulation pipe 201b and the return valve 202b are opened, so that the coal powder on the weighing meter 105b passes through the first return pipe 202a, the return valve 202b, the second return pipe 202c, the second drainage pipe 104c, the negative pressure vacuum pump 104b and the first drainage pipe 104a and falls into the coal powder pipeline 101. The advantage of such a setting is that it not only recycles the coal powder and saves costs, but also avoids the leakage of coal powder and pollution of the surrounding environment.

[0054] Example 4

[0055] Reference Figure 1 to Figure 3, which is the fourth embodiment of the present invention. In this embodiment, when the amplitude is 3 (mm pp), not only the fine coal powder passing rate is 97%, but also the efficiency is the highest.

[0056] Specifically, the screening element 103 includes a packaging shell 103c fixedly connected and communicated with the coal powder inlet 102d, a vibrator bracket is provided on the inner wall of the packaging shell 103c, a vibrator 103a is provided on the vibrator bracket, a filter plate 103b is provided on the vibrator 103a to seal the internal space of the packaging shell 103c, and a plurality of filter holes are opened on the filter plate 103b.

[0057] Amplitude (mmp-p) Fine coal powder passing rate (%) Coal powder thickness layer (mm) 1 83 1 2 71 1.2 3 97 1.9 4 86 2.3 5 73 2.8

[0058] The above table shows the influence of vibrator amplitude on the fine coal powder passing rate and coal powder thickness layer.

[0059] Among them, according to the above table, the amplitude has an impact on the pass rate of fine coal powder. If the amplitude is too small, it cannot provide enough kinetic energy for the coal powder particles, so that some coal powder particles cannot approach the filter holes; if the amplitude is moderate, the vibration energy can not only push the coal powder to approach the sieve holes and fall in, but also make the coal powder particles squeeze and touch each other to form a moderate coal powder thickness layer and then disperse quickly; if the amplitude is too large, the coal powder particles will produce more squeezing, contact and agglomeration, which is not easy to disperse, forming a thick coal powder layer, so that the filter holes are blocked and cannot pass through.

[0060] In summary, the amplitude range of the vibrator 103a to make the fine coal powder on the filter plate 103b pass through the filter holes is generally 1 to 5 (mm pp). When the amplitude is 3 (mm pp), not only the fine coal powder passing rate is 97%, which is the highest efficiency, but also it can avoid that when the amplitude is too small, part of the coal powder on the inner wall of the coal powder inlet 102d, the coarse coal powder inlet 106d and the fine coal powder inlet 107d connected to the packaging shell 103c is attached to the inner wall of the coal powder inlet 102d, the coarse coal powder inlet 106d and the fine coal powder inlet 107d. When the amplitude is too large, the second sampling tube 102c and the coal powder inlet 102d are damaged. The rubber sleeves between the coarse coal powder inlet 106d and the coarse coal powder second guide pipe 106c, and the fine coal powder inlet 107d and the fine coal powder second guide pipe 107c increase mechanical fatigue and reduce service life, which in turn causes coal powder to leak out from the gaps between the second sampling tube 102c and the coal powder inlet 102d, the coarse coal powder inlet 106d and the coarse coal powder second guide pipe 106c, and the fine coal powder inlet 107d and the fine coal powder second guide pipe 107c.

[0061] Importantly, it should be noted that the construction and arrangement of the present application shown in a number of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be easily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any clause of "coal powder automatic sampling online screening fineness measurement device plus function" is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also an equivalent structure. Without departing from the scope of the invention, other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to a specific embodiment, but extends to a variety of modifications that still fall within the scope of the appended claims.

[0062] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0063] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0064] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A coal powder automatic sampling and online screening fineness measurement device, characterized in that: include, A measuring assembly (100) comprises a pulverized coal pipeline (101), a sampling member (102) arranged on the pulverized coal pipeline (101), a screening member (103) arranged on the sampling member (102), a coarse pulverized coal guide member (106) arranged on the screening member (103), a fine pulverized coal guide member (107) arranged on the screening member (103) and the coarse pulverized coal guide member (106), a metering member (105) arranged on the fine pulverized coal guide member (107), and a flow guide member (104) arranged on the metering member (105) and the pulverized coal pipeline (101); and, The recovery component (200) comprises a circulation component (201) arranged on the metering component (105) and a return component (202) arranged on the metering component (105) and the flow guide component (104).

2. The automatic sampling and online screening fineness measuring device for coal powder according to claim 1, characterized in that: The sampling component (102) comprises a first sampling tube (102a) penetrating the pulverized coal pipeline (101) and fixedly sleeved with the pulverized coal pipeline (101); a sampling valve (102b) is provided at one end of the first sampling tube (102a) away from the pulverized coal pipeline (101); a second sampling tube (102c) is provided at one end of the sampling valve (102b) away from the first sampling tube (102a); and a pulverized coal inlet (102d) is provided at one end of the second sampling tube (102c) away from the sampling valve (102b).

3. The automatic sampling and online screening fineness measuring device for coal powder according to claim 2, characterized in that: The screening element (103) comprises a packaging shell (103c) fixedly connected to and communicated with the coal powder inlet (102d); a vibrator (103a) is arranged on the inner wall of the packaging shell (103c); a filter plate (103b) is arranged on the vibrator (103a) to seal the internal space of the packaging shell (103c); and a plurality of filter holes are provided on the filter plate (103b).

4. The automatic sampling and online screening fineness measuring device for coal powder according to claim 3 is characterized in that: The coarse coal powder guide (106) includes a coarse coal powder inlet (106d) fixedly connected to and communicated with the top of the packaging shell (103c); a coarse coal powder second guide pipe (106c) is provided at one end of the coarse coal powder inlet (106d) away from the packaging shell (103c); a coarse coal powder guide valve (106b) is provided at one end of the coarse coal powder second guide pipe (106c) away from the coarse coal powder inlet (106d); and a coarse coal powder first guide pipe (106a) is provided at one end of the coarse coal powder guide valve (106b) away from the coarse coal powder second guide pipe (106c).

5. The automatic sampling and online screening fineness measuring device for coal powder according to claim 4 is characterized in that: The fine coal powder guide (107) includes a fine coal powder inlet (107d) fixedly connected to and communicated with the bottom of the packaging shell (103c); a fine coal powder second guide pipe (107c) is provided at one end of the fine coal powder inlet (107d) away from the packaging shell (103c); a fine coal powder guide valve (107b) is provided at one end of the fine coal powder second guide pipe (107c) away from the fine coal powder inlet (107d); and a fine coal powder first guide pipe (107a) is provided at one end of the fine coal powder guide valve (107b) away from the fine coal powder second guide pipe (107c).

6. The automatic sampling and online screening fineness measuring device for pulverized coal according to claim 5, characterized in that: One end of the first fine coal powder guide pipe (107a) away from the fine coal powder guide valve (107b) is fixedly connected to and communicated with the first coarse coal powder guide pipe (106a), and the metering member (105) includes a cyclone separator (105a) fixedly connected to and communicated with the first coarse coal powder guide pipe (106a), and a weighing instrument (105b) is provided on the bottom inner wall of the cyclone separator (105a).

7. The automatic sampling and online screening fineness measuring device for coal powder according to claim 6, characterized in that: The drainage member (104) comprises a third drainage pipe (104e) fixedly connected to and communicated with the cyclone separator (105a); a drainage valve (104d) is provided at one end of the third drainage pipe (104e) away from the cyclone separator (105a); and a second drainage pipe (104c) is provided at one end of the drainage valve (104d) away from the third drainage pipe (104e).

8. The automatic sampling and online screening fineness measuring device for pulverized coal according to claim 7, characterized in that: A negative pressure vacuum pump (104b) is provided at one end of the second drainage pipe (104c) away from the drainage valve (104d); a first drainage pipe (104a) fixedly connected to and in communication with the pulverized coal pipeline (101) is provided at one end of the negative pressure vacuum pump (104b) away from the second drainage pipe (104c); and the circulation component (201) includes a fan (201a).

9. The automatic sampling and online screening fineness measuring device for pulverized coal according to claim 8, characterized in that: A first circulation pipe (201b) in communication with the fan (201a) is fixedly connected to the fan (201a); a circulation valve (201c) is provided at one end of the first circulation pipe (201b) away from the fan (201a); a second circulation pipe (201d) is provided at one end of the circulation valve (201c) away from the first circulation pipe (201b); and an end of the second circulation pipe (201d) away from the circulation valve (201c) is fixedly connected to and in communication with the cyclone separator (105a).

10. The automatic sampling and online screening fineness measuring device for coal powder according to claim 9, characterized in that: The return member (202) includes a first return pipe (202a) fixedly connected and communicated with the cyclone separator (105a), a return valve (202b) is provided at one end of the first return pipe (202a) away from the cyclone separator (105a), and a second return pipe (202c) fixedly connected and communicated with the second drainage pipe (104c) is provided at one end of the return valve (202b) away from the first return pipe (202a).

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