Device system and method for monitoring dust deposition height of negative pressure dedusting horizontal flue

Abstract

The invention relates to a device system and method for monitoring the dust deposition height of a negative pressure dust removal horizontal flue. The device system comprises a control unit and a monitoring unit. The monitoring unit comprises a monitoring pipe, the monitoring pipe is arranged in the negative pressure dust removal horizontal flue, and the monitoring pipe comprises a head section and a tail section which are vertically communicated with each other; the head section of the monitoring pipe is parallel to the height direction of accumulated dust in the negative-pressure dust removal horizontal flue, a dustproof umbrella cap is arranged at the top of the head section, a cavity is formed in the dustproof umbrella cap, a downward opening is formed in the bottom of the cavity, and the opening is communicated with the head section of the monitoring pipe; a negative pressure transmitter is arranged on the tail section of the monitoring pipe and comprises a signal output end connected with the control unit. The device system and the method provided by the invention can realize online detection of the dust deposition height of the negative-pressure dust removal horizontal flue, provide horizontal flue dust removal early warning for the dust removal system, reduce the workload of operators and ensure the safe operation of the dust removal system.

Description

Technical Field

[0001] The invention relates to the technical field of flue dust accumulation monitoring, and in particular to a device system and method for monitoring the dust accumulation height of a negative pressure dust removal horizontal flue. Background Art

[0002] Negative pressure dust removal system is now widely used in metallurgy, coking, power and chemical industries. Dust accumulation in the flue poses a great threat to the safe operation of the dust removal system. It is easy to cause flue blockage and a sharp increase in flue gas velocity due to dust accumulation in the flue, which in turn leads to flue wear and leakage, and even collapse due to dust accumulation height exceeding the design load of the flue.

[0003] In the steelmaking process, the negative pressure dust removal system usually performs dust removal according to the operating conditions of the working point. At the same time, a set of dust removal systems has multiple points. When the system is not in full load conditions, the fan frequency reduction operation will cause the flue gas flow rate in the horizontal flue to be lower than the design value, thereby causing dust accumulation. To ensure safe operation, the limit value of the dust accumulation height has been set when the flue is designed, and this value must not be exceeded during operation.

[0004] During the operation of the negative pressure dust removal system, it is necessary to timely grasp the dust accumulation status in the flue and take measures such as dust cleaning in time. In the existing process, the dust accumulation in the flue is usually observed by setting a manhole door. This method is difficult to see the dust accumulation phenomenon in the flue when the negative pressure dust removal system is running, and it is also impossible to judge the thickness of the dust accumulation. In addition, with the increase in the number of dust removal equipment, the maintenance pressure on the dust removal equipment personnel doubles, and the flue gas flow rate in the horizontal flue is low, which is prone to dust accumulation. Therefore, it is particularly important to perform online dust accumulation height detection on the horizontal flue of the negative pressure dust removal system.

[0005] CN116295044A discloses an online monitoring method for the thickness of flue dust accumulation, which measures the distance to the upper surface of the dust accumulation layer at the bottom of the flue in real time by arranging a certain number of distance measuring devices on the upper wall of the flue to be measured, and compares it with the distance when there is no dust accumulation at the bottom of the flue, so as to judge whether there is dust accumulation at the bottom of the flue, the thickness of the dust accumulation layer at different positions, and the position of the dust accumulation. This method can only be applied to systems with low dust concentration in the flue and weak dust abrasion.

[0006] However, in actual production, the installation and arrangement of the purge device is difficult, and the purge device is easily worn by the dust in the flue, losing the purge effect. In addition, the distance measuring device is usually a laser distance measuring device, a radar distance measuring device, etc. In the case of high dust concentration, it is easy to feed back the position of the high dust concentration as the flue dust accumulation height instead of the actual dust accumulation height, especially for dust removal flues with extremely high dust concentration in the steelmaking process, such as refining stations and converter secondary flue gas.

[0007] Therefore, providing a device and method that can withstand flue dust abrasion and accurately reflect the ash accumulation height in a high-concentration flue gas environment is a technical problem that needs to be solved in the current field. Summary of the invention

[0008] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a device system and method for monitoring the ash accumulation height in a negative pressure dust removal horizontal flue. Compared with the prior art, the device system provided by the present invention can determine whether the ash accumulation height at the bottom of the flue has reached a warning value by monitoring the negative pressure value in the pipe, thereby determining whether the flue needs to be cleaned and the location that needs to be cleaned.

[0009] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0010] In a first aspect, the present invention provides a device system for monitoring the dust accumulation height of a negative pressure dust removal horizontal flue, the device system comprising a control unit and a monitoring unit;

[0011] The monitoring unit comprises a monitoring tube, which is arranged inside the negative pressure dust removal horizontal flue, and along the flue gas flow direction, the monitoring tube comprises a head section and a tail section which are vertically connected to each other;

[0012] The first section of the monitoring tube is parallel to the height direction of the dust accumulation in the negative pressure dust removal horizontal flue, a dustproof cap is arranged on the top of the first section, the interior of the dustproof cap is a cavity, a downward opening is arranged at the bottom of the cavity, and the opening is connected to the first section of the monitoring tube;

[0013] A negative pressure transmitter is arranged on the tail section of the monitoring tube, and the negative pressure transmitter comprises a signal output end connected to the control unit.

[0014] In the present invention, the negative pressure dust removal horizontal flue refers to the horizontal flue of the front-end pipe network of the dust collector of the negative pressure dust removal system in the dust control of the steelmaking process station. In the device system provided by the present invention, by setting a monitoring tube inside the negative pressure dust removal horizontal flue and using a negative pressure transmitter to measure the negative pressure change, the height of the dust accumulation in the flue can be monitored in real time and accurately, avoiding the errors of traditional manual monitoring and providing monitoring accuracy and reliability. Among them, the present invention can prevent the dust accumulation from entering the monitoring tube by setting a dustproof umbrella cap, and at the same time realize the connection of the air pressure between the monitoring tube and the negative pressure dust removal horizontal flue, thereby improving the stability of the system and reducing the maintenance cost. The present invention can realize automatic monitoring of the dust accumulation height and real-time data transmission by setting a control unit, and the control unit can issue an alarm in time according to the monitoring data, thereby improving the operation efficiency.

[0015] Preferably, the dustproof umbrella cap comprises a windward surface facing the direction of the smoke airflow and a leeward surface facing away from the direction of the smoke airflow; the windward surface is a circular spherical surface.

[0016] Preferably, the leeward side of the dustproof umbrella cap is in a teardrop shape.

[0017] Preferably, the device system also includes a pressure purge unit; the pressure purge unit includes a pressure gas source, a purge valve, a first pressure transmitter and a second pressure transmitter; the outlet of the pressure gas source is connected to the delivery pipe, and the outlet of the delivery pipe is connected to the tail section of the monitoring pipe; a purge valve is provided on the delivery pipe, and a first pressure transmitter is provided between the pressure gas source and the purge valve; and a second pressure transmitter is provided at the tail section of the monitoring pipe.

[0018] Preferably, the second pressure transmitter is arranged on the monitoring pipe between the connection point between the monitoring pipe and the delivery pipe and the connection point between the tail section and the head section.

[0019] Preferably, the first pressure transmitter comprises a signal output terminal connected to the control unit.

[0020] Preferably, the second pressure transmitter comprises a signal output terminal connected to the control unit.

[0021] Preferably, the control unit comprises a signal output terminal connected to the purge valve.

[0022] In a second aspect, the present invention provides a method for monitoring the dust accumulation height of a negative pressure dust removal horizontal flue, the method adopts the device system for monitoring the dust accumulation height of a negative pressure dust removal horizontal flue according to the first aspect of the present invention, the method includes a monitoring mode, and the monitoring mode includes the following steps:

[0023] The monitoring tube is connected to the negative pressure dust removal horizontal flue, and the negative pressure value in the monitoring tube is monitored in real time through the negative pressure transmitter, thereby reflecting the negative pressure value in the negative pressure dust removal horizontal flue, and the monitored negative pressure value is transmitted to the control unit;

[0024] The control unit analyzes the received negative pressure data. If the negative pressure value is higher than the set value, the control unit will send out an alarm signal and feed back the alarm signal and the cleaning position to the operation duty room. If the negative pressure value is 0, it means that the first section of the monitoring tube is completely buried by dust.

[0025] The method provided by the present invention is based on the adopted device system, thereby realizing online monitoring of the dust accumulation height of the negative pressure dust removal horizontal flue, providing the dust removal system with horizontal flue cleaning early warning, reducing the workload of operating personnel, and ensuring the safe operation of the dust removal system.

[0026] Preferably, the method further comprises a monitoring tube cleaning mode, wherein the monitoring tube cleaning mode comprises:

[0027] After the dust cleaning is completed, the monitoring tube cleaning mode of the control unit is turned on, and the control unit sends a signal to turn on the pressure gas source and the purge valve to purge the monitoring tube. The first pressure transmitter and the second pressure transmitter monitor the pressure signal in real time and transmit it to the control unit;

[0028] The control unit analyzes the received pressure data. If the pressure value of the first pressure transmitter is greater than the pressure value of the second pressure transmitter, and the ratio of the two reaches the set value and remains stable, it means that the cleaning is completed. The control unit sends a signal to close the purge valve and feeds back the cleaning completion signal to the operation duty room.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] (1) In the device system provided by the present invention, a monitoring tube is installed at a dust-prone position of the flue to be tested, and the negative pressure value in the monitoring tube is monitored in real time, so as to judge whether the dust accumulation height at the bottom of the flue has reached a set value based on the negative pressure value, and finally accurately feedback whether dust cleaning is required and the dust cleaning position, thereby effectively solving the problems of flue blockage caused by dust accumulation, sharp increase in flue gas flow rate, flue wear and leakage, and collapse caused by dust accumulation exceeding the design load in the traditional negative pressure dust removal system.

[0031] (2) In the device system provided by the present invention, the windward surface of the dustproof umbrella cap is preferably designed to be a round spherical surface to block the airflow from entering the monitoring tube, and the leeward surface is in the shape of a water droplet to prevent the generation of a vortex effect, thereby preventing the dust in the flue from settling into the monitoring tube due to the vortex effect. A downward opening is provided to communicate with the monitoring tube to prevent the dust in the flue from settling into the monitoring tube due to gravity, thereby ultimately ensuring the unobstructed flow of the monitoring tube and the accuracy and stability of the negative pressure measurement.

[0032] (3) In the device system provided by the present invention, the pressure purge unit can be set to realize automatic cleaning of the monitoring tube, which not only improves the cleaning efficiency but also reduces manual operation. Through regular purge, the monitoring pipeline is always kept clean, avoiding blockage and measurement errors caused by dust accumulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic diagram of the structure of the device system provided in Example 1 of the present invention;

[0034] Figure 2 This is a front view of the dustproof umbrella cap provided in Example 1 of the present invention;

[0035] Figure 3 is a top view of the dustproof umbrella cap provided in Example 1 of the present invention;

[0036] 1-control unit; 21-monitoring tube; 22-dustproof umbrella cap; 23-negative pressure transmitter; 31-pressure gas source; 32-purge valve; 33-first pressure transmitter; 34-second pressure transmitter; 35-delivery pipe. DETAILED DESCRIPTION

[0037] It should be understood that, in the description of the present invention, the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0038] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected 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.

[0039] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0040] In a specific embodiment, Figure 1 As shown, the present invention provides a device system for monitoring the dust accumulation height of a negative pressure dust removal horizontal flue, the device system comprises a control unit 1 and a monitoring unit;

[0041] The monitoring unit includes a monitoring tube 21, which is arranged inside the negative pressure dust removal horizontal flue. Along the flue gas flow direction, the monitoring tube 21 includes a first section and a tail section which are vertically connected to each other;

[0042] The first section of the monitoring tube 21 is parallel to the height direction of the dust accumulation in the negative pressure dust removal horizontal flue, and a dustproof cap 22 is provided on the top of the first section. The interior of the dustproof cap 22 is a cavity, and a downward opening is provided at the bottom of the cavity, and the opening is connected to the first section of the monitoring tube 21;

[0043] A negative pressure transmitter 23 is provided on the tail section of the monitoring tube 21 . The negative pressure transmitter 23 includes a signal output terminal connected to the control unit 1 .

[0044] In the present invention, the negative pressure dust removal horizontal flue refers to the horizontal flue of the front-end pipe network of the dust collector of the negative pressure dust removal system in the dust control of the steelmaking process station. In the device system provided by the present invention, by setting a monitoring tube 21 inside the negative pressure dust removal horizontal flue and using a negative pressure transmitter 23 to measure the negative pressure change, the height of the dust accumulation in the flue can be monitored in real time and accurately, avoiding the error of traditional manual monitoring and providing the accuracy and reliability of monitoring. Among them, the present invention can prevent the dust accumulation from entering the monitoring tube 21 by setting a dustproof umbrella cap 22, and at the same time realizes the connection of the air pressure between the monitoring tube 21 and the negative pressure dust removal horizontal flue, thereby improving the stability of the system and reducing the maintenance cost. The present invention can realize the automatic monitoring and real-time data transmission of the dust accumulation height by setting a control unit 1, and the control unit 1 can issue an alarm in time according to the monitoring data, thereby improving the operation efficiency.

[0045] In the present invention, the negative pressure transmitter 23 is a sensor for measuring negative pressure or vacuum, which can convert the negative pressure signal into a standard electrical signal output. The negative pressure transmitter 23 is usually used to measure the pressure below the atmospheric pressure, and is suitable for detecting the negative pressure value of the negative pressure dust removal system.

[0046] In the present invention, the monitoring tubes are generally installed in groups at positions where dust is easily accumulated in the negative pressure dust removal horizontal flue. The position of the monitoring tube 21 where the control unit 1 detects that the negative pressure value exceeds the set value is the dust cleaning position.

[0047] In some embodiments, such as Figure 2 and Figure 3 As shown, the dustproof umbrella cap 22 includes a windward surface facing the direction of the flue gas flow and a leeward surface facing away from the direction of the flue gas flow; the windward surface is a circular spherical surface.

[0048] In some embodiments, the leeward side of the dustproof umbrella cap 22 is in a teardrop shape.

[0049] In the present invention, the windward surface is designed to be a round spherical surface to block the airflow from entering the monitoring tube 21, and the leeward surface is designed to be a water drop shape to prevent the generation of eddy current effect, thereby preventing the dust in the flue from settling to the monitoring tube 21 due to the eddy current effect. Among them, the windward surface is generally made of wear-resistant material, which can increase the service life of the device system.

[0050] In some embodiments, the device system also includes a pressure purge unit; the pressure purge unit includes a pressure gas source 31, a purge valve 32, a first pressure transmitter 33 and a second pressure transmitter 34; the outlet of the pressure gas source 31 is connected to a delivery pipe 35, and the outlet of the delivery pipe 35 is connected to the tail section of the monitoring tube 21; a purge valve 32 is provided on the delivery pipe 35, and a first pressure transmitter 33 is provided between the pressure gas source 31 and the purge valve 32; and a second pressure transmitter 34 is provided at the tail section of the monitoring tube 21.

[0051] In some embodiments, the second pressure transmitter 34 is disposed on the monitoring tube 21 between the connection point between the monitoring tube 21 and the delivery tube 35 and the connection point between the tail section and the head section.

[0052] In some embodiments, the first pressure transmitter 33 includes a signal output terminal connected to the control unit 1 .

[0053] In some embodiments, the second pressure transmitter 34 includes a signal output terminal connected to the control unit 1 .

[0054] In some of the embodiments, the control unit 1 includes a signal output terminal connected to the purge valve 32 .

[0055] In the present invention, according to different working conditions or monitoring requirements of different dust accumulation heights, the height of the first section of the monitoring pipe 21 can be adaptively adjusted to ensure monitoring accuracy and meet the use requirements of different industrial scenarios.

[0056] In the present invention, according to the height direction of the ash accumulation in the flue, multiple groups of monitoring tubes 21 can be set from top to bottom at a certain interval as needed, and the monitoring tubes 21 can be lowered to the bottom of the flue at the lowest, thereby meeting the monitoring requirements of different ash accumulation heights.

[0057] In another specific embodiment, the present invention provides a method for monitoring the dust accumulation height of a negative pressure dust removal horizontal flue, the method adopts a device system for monitoring the dust accumulation height of a negative pressure dust removal horizontal flue provided in a specific embodiment, the method includes a monitoring mode, and the monitoring mode includes the following steps:

[0058] The monitoring tube 21 is connected to the negative pressure dust removal horizontal flue, and the negative pressure value in the monitoring tube 21 is monitored in real time through the negative pressure transmitter 23, thereby reflecting the negative pressure value in the negative pressure dust removal horizontal flue, and the monitored negative pressure value is transmitted to the control unit 1;

[0059] The control unit 1 analyzes the received negative pressure value data. If the negative pressure value is higher than the set value, the control unit sends out an alarm signal and feeds back the alarm signal and the dust cleaning position to the operation duty room. If the negative pressure value is 0, it means that the first section of the monitoring tube 21 is completely buried by dust.

[0060] In the present invention, the method is based on the adopted device system, so as to realize online monitoring of the dust accumulation height of the negative pressure dust removal horizontal flue, provide horizontal flue cleaning warning for the dust removal system, reduce the workload of the operating personnel, and ensure the safe operation of the dust removal system.

[0061] In the present invention, the method for selecting the setting value of the negative pressure value is a conventional method in the field. Specifically, the pressure loss Δpm along the straight pipe section is generally calculated based on the length L of the front-end pipe network of the negative pressure dust removal and the friction resistance Rm of each unit pipe length. The pressure loss Δpj at the local resistance point of the pipe fitting is calculated based on the number of elbows and tees in the front-end pipe network of the negative pressure dust removal and the pipe resistance coefficient in the "Heating and Ventilation Design Manual for Iron and Steel Enterprises". The total pressure loss P of the pipe network is P=∑Δpm+∑Δpj, and the value is set to 0.6P.

[0062] In some embodiments, the method further includes a monitoring tube cleaning mode, wherein the monitoring tube cleaning mode includes:

[0063] After the dust cleaning is completed, the monitoring tube cleaning mode of the control unit 1 is turned on, and the control unit 1 sends a signal to turn on the pressure gas source 31 and the purge valve 32 to purge the monitoring tube 21. The first pressure transmitter 33 and the second pressure transmitter 34 monitor the pressure signal in real time and transmit it to the control unit 1;

[0064] The control unit 1 analyzes the received pressure data. If the pressure value of the first pressure transmitter 33 is greater than the pressure value of the second pressure transmitter 34, and the ratio of the two reaches the set value and remains stable, it means that the cleaning is completed. The control unit 1 sends a signal to close the purge valve 32 and feeds back the cleaning completion signal to the operation duty room.

[0065] In the present invention, during the cleaning process, the control unit 1 compares the pressure values ​​of the first pressure transmitter 33 and the second pressure transmitter 34. If the pressure value of the first pressure transmitter 33 is greater than the pressure value of the second pressure transmitter 34, and the ratio of the two reaches the set value and remains stable, for example, for 2-5 seconds, it means that the monitoring tube 21 is cleaned. In the present invention, the set value of the pressure transmitter ratio is generally set according to the diameter of the corresponding delivery pipe and the monitoring pipe. Specifically, when the cleaning is not completed, the monitoring pipe is in a blocked state, and the pressure values ​​of the first pressure transmitter 33 and the second pressure transmitter 34 are close; when the cleaning is completed, the pipeline is unblocked, and the pressure value of the second pressure transmitter 34 decreases. According to the continuity equation (A1υ1=A2υ2) and the Bernoulli equation Get the pressure transmitter ratio The set value is 0.6I.

[0066] The composition of the technical solution of the present invention is specifically described below through Examples 1-2 and Comparative Example 1.

[0067] Example 1

[0068] This embodiment provides a device system for monitoring the dust accumulation height of a negative pressure dust removal horizontal flue, which is used in a refining dust removal system of a steel plant. The device system includes a control unit 1, a monitoring unit and a pressure purge unit;

[0069] The monitoring unit includes a monitoring tube 21, which is arranged inside the negative pressure dust removal horizontal flue. Along the flue gas flow direction, the monitoring tube 21 includes a first section and a tail section that are vertically connected to each other. The first section of the monitoring tube 21 is parallel to the height direction of the dust accumulation in the negative pressure dust removal horizontal flue. A dustproof umbrella cap 22 is arranged on the top of the first section. The dustproof umbrella cap 22 includes a windward surface facing the flue gas airflow direction and a leeward surface facing away from the flue gas airflow direction. The windward surface is a circular spherical surface, and the leeward surface is a teardrop shape. The interior of the dustproof umbrella cap 22 is a cavity, and a downward opening is arranged at the bottom of the cavity. The opening is connected to the first section of the monitoring tube 21. A negative pressure transmitter 23 is arranged on the tail section of the monitoring tube 21, and the negative pressure transmitter 23 includes a signal output end connected to the control unit 1.

[0070] The pressure purge unit includes a pressure gas source 31, a purge valve 32, a first pressure transmitter 33 and a second pressure transmitter 34. The outlet of the pressure gas source 31 is connected to a delivery pipe 35, and the outlet of the delivery pipe 35 is connected to the tail section of the monitoring pipe 21. The delivery pipe 35 is provided with a purge valve 32. A first pressure transmitter 33 is provided between the pressure gas source 31 and the purge valve 32. The tail section of the monitoring pipe 21 is provided with a second pressure transmitter 34. The second pressure transmitter 34 is provided on the monitoring pipe 21 pipeline between the connection point between the monitoring pipe 21 and the delivery pipe 35 and the connection point between the tail section and the first section. The first pressure transmitter 33 and the second pressure transmitter 34 both include a signal output end connected to the control unit 1, and the control unit 1 includes a signal output end connected to the purge valve 32.

[0071] The present embodiment also provides a method for monitoring the dust accumulation height of the negative pressure dust removal horizontal flue. The method adopts the above-mentioned device system and is used in a steel mill refining dust removal system. The main dust removal station is the steel refining station. The dust collector fan pressure is 6000Pa. A plurality of device systems provided by the present embodiment are arranged in the φ4000 horizontal flue in front of the dust collector inlet. The dust accumulation height alarm value L1 is set to 700mm according to the design requirements, and the corresponding negative pressure value setting value is -1000Pa. The pressure ratio setting value corresponding to the cleaning completion is 4;

[0072] The method comprises the following steps:

[0073] Monitoring mode: The monitoring tube 21 is connected to the negative pressure dust removal horizontal flue, and the negative pressure value in the monitoring tube 21 is monitored in real time through the negative pressure transmitter 23, thereby reflecting the negative pressure value in the negative pressure dust removal horizontal flue, and the monitored negative pressure value is transmitted to the control unit 1; the control unit 1 analyzes the received negative pressure value data. If the negative pressure value is higher than the set value (-1000Pa), the control unit sends an alarm signal, and feeds back the alarm signal "arrange cleaning" and the cleaning position to the operation duty room. If the negative pressure value is 0, it means that the first section of the monitoring tube 21 is completely buried in dust.

[0074] Monitoring tube cleaning mode: After the dust cleaning is completed, click the "monitoring tube cleaning" command to turn on the monitoring tube cleaning mode of the control unit 1. The control unit 1 sends a signal to turn on the pressure gas source 31 and the purge valve 32 to purge the monitoring tube 21. The pressure value monitored by the first pressure transmitter 33 is recorded as A1, and the pressure value monitored by the second pressure transmitter 34 is recorded as A2. The monitoring pressure signal is transmitted to the control unit 1 in real time; the control unit 1 analyzes the received pressure data. If A1 / A2>4 and remains stable for 3-5s, it means that the cleaning is completed. The control unit 1 sends a signal to close the purge valve 32, and feeds back the "cleaning completed" signal to the operation duty room.

[0075] Example 2

[0076] This embodiment provides a device system for monitoring the dust accumulation height of a negative pressure dust removal horizontal flue. The only difference compared with Embodiment 1 is that the windward side and the leeward side of the dustproof umbrella cap form conical surfaces.

[0077] Compared with Example 1, the conical umbrella cap of this embodiment is easy to form dust accumulation on the top of the umbrella cap, and the air flow resistance is large, which makes it easy for the dust accumulation to be blown into the monitoring tube, affecting the accuracy of dust accumulation height monitoring. It can be seen that the present invention can further improve the accuracy of dust accumulation monitoring by optimally controlling the shape of the dustproof umbrella cap.

[0078] Comparative Example 1

[0079] This comparative example provides a device system for monitoring the dust accumulation height of a negative pressure dust removal horizontal flue. The only difference compared with Example 1 is that the first section and the tail section of the monitoring tube are not perpendicular to each other, and the angle between the two is 120°.

[0080] Compared with Example 1, the first section and the tail section of the monitoring tube in this comparative example are not perpendicular to each other. When the angle between the two is 120°, it is not convenient for the monitoring tube to adjust the monitoring height up and down according to the calculated value of dust accumulation, the exposed length of the monitoring tube in the flue increases, and the monitoring pipe will increase the length of wear. It can be seen that the monitoring tube of the present invention includes a first section and a tail section perpendicular to each other, which can ensure the dust accumulation monitoring effect while ensuring the safe operation of the dust removal system.

[0081] In summary, the device system and method provided by the present invention can realize online detection of the dust accumulation height of the negative pressure dust removal horizontal flue, provide horizontal flue cleaning warning for the dust removal system, reduce the workload of operating personnel, and ensure the safe operation of the dust removal system.

[0082] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A device system for monitoring the dust accumulation height of a negative pressure dust removal horizontal flue, characterized in that: The device system includes a control unit and a monitoring unit; The monitoring unit comprises a monitoring tube, which is arranged inside the negative pressure dust removal horizontal flue, and along the flue gas flow direction, the monitoring tube comprises a head section and a tail section which are vertically connected to each other; The first section of the monitoring tube is parallel to the height direction of the dust accumulation in the negative pressure dust removal horizontal flue, a dustproof cap is arranged on the top of the first section, the interior of the dustproof cap is a cavity, a downward opening is arranged at the bottom of the cavity, and the opening is connected to the first section of the monitoring tube; A negative pressure transmitter is arranged on the tail section of the monitoring tube, and the negative pressure transmitter comprises a signal output end connected to the control unit.

2. The device system according to claim 1, characterized in that: The dustproof umbrella cap comprises a windward surface facing the direction of the smoke flow and a leeward surface facing away from the direction of the smoke flow; the windward surface is a circular spherical surface.

3. The device system according to claim 2, characterized in that: The leeward side of the dustproof umbrella cap is in a water drop shape.

4. The device system according to any one of claims 1 to 3, characterized in that: The device system also includes a pressure purge unit; The pressure purge unit includes a pressure gas source, a purge valve, a first pressure transmitter and a second pressure transmitter; The outlet of the pressure gas source is connected to the delivery pipe, and the outlet of the delivery pipe is connected to the tail section of the monitoring pipe; The delivery pipe is provided with a purge valve, and a first pressure transmitter is provided between the pressure gas source and the purge valve; The tail section of the monitoring tube is provided with a second pressure transmitter.

5. The device system according to claim 4, characterized in that: The second pressure transmitter is arranged on the monitoring pipe line between the connection point between the monitoring pipe and the delivery pipe and the connection point between the tail section and the head section.

6. The device system according to claim 5, characterized in that: The first pressure transmitter comprises a signal output terminal connected to the control unit.

7. The device system according to claim 6, characterized in that: The second pressure transmitter includes a signal output terminal connected to the control unit.

8. The device system according to claim 7, characterized in that: The control unit comprises a signal output terminal connected to the purge valve.

9. A method for monitoring the dust accumulation height of a negative pressure dust removal horizontal flue, characterized in that: The method adopts the device system for monitoring the dust accumulation height of the negative pressure dust removal horizontal flue as claimed in any one of claims 1 to 8, and the method includes a monitoring mode, and the monitoring mode includes the following steps: The monitoring tube is connected to the negative pressure dust removal horizontal flue, and the negative pressure value in the monitoring tube is monitored in real time through the negative pressure transmitter, thereby reflecting the negative pressure value in the negative pressure dust removal horizontal flue, and the monitored negative pressure value is transmitted to the control unit; The control unit analyzes the received negative pressure data. If the negative pressure value is higher than the set value, the control unit will send out an alarm signal and feed back the alarm signal and the cleaning position to the operation duty room. If the negative pressure value is 0, it means that the first section of the monitoring tube is completely buried by dust.

10. The method according to claim 9, characterized in that The method also includes a monitoring tube cleaning mode, wherein the monitoring tube cleaning mode includes: After the dust cleaning is completed, the monitoring tube cleaning mode of the control unit is turned on, and the control unit sends a signal to turn on the pressure gas source and the purge valve to purge the monitoring tube. The first pressure transmitter and the second pressure transmitter monitor the pressure signal in real time and transmit it to the control unit; The control unit analyzes the received pressure data. If the pressure value of the first pressure transmitter is greater than the pressure value of the second pressure transmitter, and the ratio of the two reaches the set value and remains stable, it means that the cleaning is completed. The control unit sends a signal to close the purge valve and feeds back the cleaning completion signal to the operation duty room.

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