Boiler furnace negative pressure measuring device with on-line automatic ash removal function

Abstract

The utility model relates to the technical field of dusty gas pressure measurement, in particular to a boiler furnace negative pressure measuring device with an on-line automatic ash removal function, which comprises a furnace negative pressure measuring tube and a secondary settling chamber. The hearth negative pressure measuring tube is arranged on the hearth wall and internally provided with a rectangular spiral spring, the top of the hearth negative pressure measuring tube is hermetically connected with a sealing compactor, and the middle of the hearth negative pressure measuring tube is communicated with the secondary settling chamber; a swinging ash removal rod is mounted in the secondary settling chamber through a hanging pin, and a hearth negative pressure output port is formed in the top of the secondary settling chamber; the rectangular spiral spring is connected with an output shaft of the stepping motor. According to the device, on one hand, the workload of enterprise maintenance personnel is greatly reduced, scalding caused by manual ash removal is prevented, and on-line ash removal can be realized, so that the reliability of boiler operation equipment is greatly improved, the input rate of automatic operation equipment is greatly improved, and the operation efficiency of the boiler is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of dust-containing gas pressure measurement, in particular to a boiler furnace negative pressure measuring device with an online automatic dust cleaning function. Background Art

[0002] At present, all large domestic boilers use power coal as fuel. Since raw coal contains a lot of ash, the flue gas after combustion will contain a lot of dust. The safety and economy of boiler combustion depends on the stable control of the pressure of its combustion space (also known as the furnace). Since the furnace pressure is usually lower than one atmosphere, the furnace pressure is usually called the furnace negative pressure. The stable boiler combustion will be stable if the furnace negative pressure is controlled stably, and the combustion efficiency will be high. To accurately control the furnace negative pressure, the furnace negative pressure must first be accurately measured. However, since there is a lot of dust in the furnace space, the primary element of the furnace negative pressure measurement is easily blocked, resulting in inaccurate furnace negative pressure measurement. At present, in order to improve the safety and economy of power generation enterprises, the domestic power generation industry has put forward strict requirements on the main operating parameters of important equipment of enterprises. For this reason, the "Twenty-five Safety Countermeasures for Power Enterprises" requirements have been issued, among which the parameter control of boiler furnace negative pressure is also included in the requirements. The reality is that in order to prevent the furnace negative pressure measuring device from being blocked, it is necessary to manually clean the furnace negative pressure measuring device regularly. The temperature near the boiler is very high, and manual cleaning is very unsafe. At the same time, all systems that use the furnace negative pressure for automatic control must be shut down. Figure 1 This is the diagram of the most commonly used furnace negative pressure measurement device. In the figure, the inclined pipe and the vertical pipe are prone to ash accumulation. After a period of time, the two cleaning plugs must be opened for manual mechanical cleaning. Some manufacturers also install compressed air continuous purge equipment on the measuring device to prevent clogging of the measuring device. Practice has also proved that continuous compressed air purge brings huge deviations to the furnace negative pressure measurement. The measured negative pressure is often very different from the actual one. There are even serious deviations in the furnace negative pressure due to inaccurate compressed air pressure control, which often leads to automatic malfunctions. Utility Model Content

[0003] In order to overcome the existing deficiencies, the utility model provides a boiler furnace negative pressure measuring device with an online automatic ash cleaning function, and additionally designs automatic online ash cleaning equipment and a secondary sedimentation chamber, which well solves the above problems.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a boiler furnace negative pressure measuring device with online automatic ash cleaning function, comprising a furnace negative pressure measuring tube and a secondary sedimentation chamber; the furnace negative pressure measuring tube is arranged on the furnace wall, a rectangular coil spring is arranged inside, a sealing compressor is sealed at the top, and the middle is connected to the secondary sedimentation chamber; a swing cleaning rod is installed inside the secondary sedimentation chamber through a suspension pin, and a furnace negative pressure output port is arranged on the top; the rectangular coil spring is connected to the output shaft of the stepper motor.

[0005] According to another embodiment of the utility model, the furnace negative pressure measuring tube is further provided on the furnace wall at an angle, and the bottom is communicated with the inside of the furnace.

[0006] According to another embodiment of the utility model, it further includes that the secondary sedimentation chamber is arranged parallel to the furnace wall and perpendicular to the interface of the furnace negative pressure measuring tube, wherein the secondary sedimentation chamber includes an enlarged portion, a tapered portion and a connecting portion that are integrally connected, and the connecting portion is a column of the same size as the interface, the lower end of which is connected to the furnace negative pressure measuring tube, the upper end of which is connected to the small end of the tapered portion, and the large end of the tapered portion is connected to the enlarged portion; the enlarged portion is a cylinder with a diameter larger than that of the connecting portion.

[0007] According to another embodiment of the utility model, further comprising: a suspension pin is provided on the enlarged portion.

[0008] According to another embodiment of the utility model, the rectangular coil spring is a hollow structure, the top end of which is connected to the output shaft of the stepper motor, and the stepper motor is electrically connected to the programmable controller.

[0009] According to another embodiment of the utility model, it further includes that the bottom of the swing cleaning rod is located in the gap in the middle of the rectangular coil spring.

[0010] The beneficial effects of the utility model are that, on the one hand, the workload of enterprise maintenance personnel is greatly reduced and burns caused by manual dust cleaning are prevented; at the same time, since dust cleaning can be performed online, the reliability of boiler operation equipment is greatly improved, the investment rate of automatic operation equipment is greatly increased, and the boiler operation efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0012] Figure 1 It is a prior art diagram;

[0013] Figure 2 It is a structural schematic diagram of the utility model.

[0014] In the figure, 1, furnace, 2, furnace wall, 3, furnace negative pressure measuring tube, 4, rectangular coil spring, 5, stepper motor, 6, controller, 7, sealing clamp, 8, secondary sedimentation chamber, 9, swing cleaning rod, 10, suspension pin, 11, furnace negative pressure output port. DETAILED DESCRIPTION

[0015] like Figure 2 It is a structural schematic diagram of the utility model, a boiler furnace negative pressure measuring device with an online automatic ash cleaning function, which is characterized in that it includes a furnace negative pressure measuring tube 3 and a secondary sedimentation chamber 8; the furnace negative pressure measuring tube 3 is arranged on the furnace wall 2, and is provided with a rectangular coil spring 4 inside, and is sealed with a sealing compressor 7 on the top, and is connected with the secondary sedimentation chamber 8 in the middle; a swing cleaning rod 9 is installed inside the secondary sedimentation chamber 8 through a suspension pin 10, and a furnace negative pressure output port 11 is provided on the top; the rectangular coil spring 4 is connected to the output shaft of the stepper motor 5.

[0016] Specifically, the sealing presser 7 can prevent air leakage at the rotating shaft of the stepping motor 5, thereby affecting the measurement.

[0017] According to another embodiment of the utility model, the furnace negative pressure measuring tube 3 is further provided on the furnace wall 2 at an angle, and the bottom thereof is communicated with the interior of the furnace 1 .

[0018] According to another embodiment of the utility model, it further includes that the secondary sedimentation chamber 8 is arranged parallel to the furnace wall 2 and perpendicular to the interface of the furnace negative pressure measuring tube 3, wherein the secondary sedimentation chamber 8 includes an enlarged portion, a tapered portion and a connecting portion that are integrally connected, and the connecting portion is a column of the same size as the interface, the lower end of which is connected to the furnace negative pressure measuring tube 3, the upper end of which is connected to the small end of the tapered portion, and the large end of the tapered portion is connected to the enlarged portion; the enlarged portion is a cylinder with a diameter larger than that of the connecting portion.

[0019] Specifically, the diameter of the vertical part of the original measuring device is enlarged, and a secondary sedimentation chamber 8 is designed. The enlarged part of the secondary sedimentation chamber 8 has a large space, which dilutes the dust concentration in the space and is conducive to the sedimentation of dust, further improving the reliability of the device.

[0020] According to another embodiment of the utility model, further comprising: a suspension pin 10 is provided on the enlarged portion.

[0021] According to another embodiment of the utility model, the rectangular coil spring 4 is further comprised of a hollow structure, the top end of which is connected to the output shaft of the stepper motor 5 , and the stepper motor 5 is electrically connected to the programmable controller 6 .

[0022] Specifically, the rectangular coil spring 4 can rotate in the tilt measuring tube 3 driven by the stepper motor 5, and can scrape off the ash on the inner wall and transport it back to the furnace 1 through rotation. Since the center part of the rectangular coil spring 4 is empty, it will not affect the transmission of the negative pressure in the furnace while rotating to scrape the ash, thereby not affecting the accurate measurement of the negative pressure in the furnace. In addition, during its working process, there is no need to exit the corresponding automatic control equipment of the negative pressure in the furnace, and the online cleaning of the negative pressure in the furnace can be fully realized, which provides a guarantee for the continuous and stable operation of the boiler equipment.

[0023] According to another embodiment of the utility model, the bottom of the swing cleaning rod 9 is located in the gap in the middle of the rectangular coil spring 4 .

[0024] Specifically, the swing cleaning rod 9 is suspended in the tube by the suspension pin 10, and the lower end touches the rectangular coil spring 4. When the rectangular coil spring 4 is driven by the stepper motor 5 to rotate forward, it will drive the swing cleaning rod 9 to swing in the tube. When the rectangular coil spring 4 rotates a certain angle and cannot touch the swing cleaning rod 9, the swing cleaning rod 9 will use its own gravity to return to the vertical suspension position and wait for the next time the rectangular coil spring 4 turns around to swing again. As long as the rectangular coil spring 4 is rotating, the swing cleaning rod 9 will swing back and forth, so that the dust accumulated at the vertical connection with the furnace negative pressure measuring tube 3 can be knocked off; the present invention is equipped with a programmable controller 6 for controlling the stepper motor, which can be used to arbitrarily control the cleaning cycle operation time of the cleaning equipment.

[0025] In the specific operation process, the ash accumulation of each set of furnace negative pressure measuring device will have a certain period, and the length of the period is related to factors such as the type of coal burned and the diameter of the measuring tube. That is to say, the online device in the present invention does not need to operate continuously, and can be selectively controlled according to factors such as the boiler type, designed coal type, and measuring tube diameter of each power generation enterprise. The cleaning cycle of the cleaning equipment can be arbitrarily controlled by the controller 6, and then the rectangular coil spring 4 is driven to rotate and scrape off the ash on the inner wall of the inclined measuring tube 3 and transport it back to the furnace 1 through rotation. During the rotation of the coil spring 4, the swinging cleaning rod 9 is driven to swing back and forth to knock off the ash accumulated at the vertical connection between the secondary sedimentation chamber 8 and the furnace negative pressure measuring tube 3, thereby achieving the purpose of cleaning.

[0026] The above description is only illustrative rather than restrictive of the present invention. Those skilled in the art will understand that many modifications, changes or equivalents may be made without departing from the spirit and scope defined by the appended claims, but all will fall within the scope of protection of the present invention.

Claims

1. A boiler furnace negative pressure measuring device with online automatic ash cleaning function, characterized in that: The invention comprises a furnace negative pressure measuring tube (3) and a secondary sedimentation chamber (8); the furnace negative pressure measuring tube (3) is arranged on the furnace wall (2), a rectangular coil spring (4) is arranged inside the tube, a sealing presser (7) is sealed at the top, and the middle is connected to the secondary sedimentation chamber (8); a swinging cleaning rod (9) is installed inside the secondary sedimentation chamber (8) via a suspension pin (10), and a furnace negative pressure output port (11) is arranged at the top; the rectangular coil spring (4) is connected to the output shaft of a stepping motor (5).

2. The boiler furnace negative pressure measuring device with online automatic ash cleaning function according to claim 1 is characterized in that: The furnace negative pressure measuring tube (3) is arranged obliquely on the furnace wall (2), and the bottom is communicated with the interior of the furnace (1).

3. The boiler furnace negative pressure measuring device with online automatic ash cleaning function according to claim 1 is characterized in that: The secondary sedimentation chamber (8) is arranged parallel to the furnace wall (2) and perpendicular to the interface of the furnace negative pressure measuring tube (3), wherein the secondary sedimentation chamber (8) comprises an enlarged portion, a tapered portion and a connecting portion which are integrally connected, wherein the connecting portion is a column of the same size as the interface, the lower end of which is connected to the furnace negative pressure measuring tube (3), the upper end of which is connected to the small end of the tapered portion, and the large end of the tapered portion is connected to the enlarged portion; the enlarged portion is a cylinder with a diameter larger than that of the connecting portion.

4. The boiler furnace negative pressure measuring device with online automatic ash cleaning function according to claim 3 is characterized in that: A suspension pin (10) is provided on the enlarged portion.

5. The boiler furnace negative pressure measuring device with online automatic ash cleaning function according to claim 1 is characterized in that: The rectangular coil spring (4) is a hollow structure, the top end of which is connected to the output shaft of a stepper motor (5), and the stepper motor (5) is electrically connected to a programmable controller (6).

6. The boiler furnace negative pressure measuring device with online automatic ash cleaning function according to claim 1 is characterized in that: The bottom of the swing cleaning rod (9) is located in the gap in the middle of the rectangular coil spring (4).

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