CN114984667B - Negative pressure dust removing device and method thereof - Google Patents
Negative pressure dust removing device and method thereof Download PDFInfo
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- CN114984667B CN114984667B CN202210642247.8A CN202210642247A CN114984667B CN 114984667 B CN114984667 B CN 114984667B CN 202210642247 A CN202210642247 A CN 202210642247A CN 114984667 B CN114984667 B CN 114984667B
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- taking pipe
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- 239000000428 dust Substances 0.000 title claims abstract description 240
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000000463 material Substances 0.000 claims description 13
- 230000001360 synchronised effect Effects 0.000 claims description 12
- 230000001680 brushing effect Effects 0.000 claims description 8
- 238000005452 bending Methods 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 5
- 238000009825 accumulation Methods 0.000 description 16
- 230000005484 gravity Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012795 verification Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002636 symptomatic treatment Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/02—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising gravity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
- B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/18—Cleaning-out devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention provides a negative pressure dust removing device and a method thereof, wherein the negative pressure dust removing device comprises: the dust removing hopper is arranged between the outlet of the induced draft fan and the inlet of the hearth tail flue, and is narrowed from the connection position with the induced draft fan to the connection position with the hearth tail flue, wherein the side wall of the dust removing hopper is provided with at least one standard pressure taking port; the pressure taking pipe group comprises at least one pressure taking pipe, one end of the pressure taking pipe penetrates through the standard pressure taking port to enter the dust removing bucket, and the other end of the pressure taking pipe is positioned outside the dust removing bucket and is connected with a valve at the end part; the negative pressure transmitter is used for measuring the pressure in the pressure taking pipe, and a bifurcation section is led out from one side of the pressure taking pipe, which is positioned outside the dust hopper, and is connected with the negative pressure transmitter. Through detecting the negative pressure in the dust hopper, the stacking height of the dust in the dust hopper is judged by the detected negative pressure value, and the stacking height of the dust in the dust hopper is rapidly acquired.
Description
Technical Field
The invention relates to the technical field of dust removing equipment, in particular to a negative pressure dust removing device and a method thereof.
Background
In the prior art, the dust removing hopper is arranged between the outlet of the induced draft fan and the inlet of the tail flue of the hearth, belongs to a negative pressure area, can generate negative pressure for ensuring that the dust removing hopper is usually used for continuously exhausting and removing dust, and is internally accumulated with dust, however, the dust removing hopper is in a closed state, and the dust accumulation height in the dust removing hopper cannot be judged by the outside.
Disclosure of Invention
The invention mainly aims to provide a negative pressure dust removing device and a negative pressure dust removing method, which solve the problem that the dust accumulation height in a dust removing hopper cannot be judged by the outside in the prior art.
In order to achieve the above object, the present invention provides a negative pressure dust removing apparatus, comprising:
The dust removing hopper is arranged between the outlet of the induced draft fan and the inlet of the hearth tail flue, and is narrowed from the connection position with the induced draft fan to the connection position with the hearth tail flue, wherein the side wall of the dust removing hopper is provided with at least one standard pressure taking port;
The pressure taking pipe group comprises at least one pressure taking pipe, one end of the pressure taking pipe penetrates through the standard pressure taking port to enter the dust removing bucket, and the other end of the pressure taking pipe is positioned outside the dust removing bucket and is connected with a valve at the end part;
The negative pressure transmitter is used for measuring the pressure in the pressure taking pipe, the branch section is led out from one side of the pressure taking pipe, which is positioned outside the dust removing hopper, to be connected with the negative pressure transmitter, and the negative pressure transmitter is electrically connected with the dust removing control system.
In order to achieve the above object, the present invention also provides a negative pressure dust removal method according to the negative pressure dust removal device as described above, the negative pressure dust removal method comprising the steps of:
When the induced draft fan is started, a valve at the tail end of the pressure taking pipe is closed;
receiving the negative pressure value measured by the negative pressure transmitter and transmitted to the negative pressure transmitter;
judging whether the negative pressure value is normal or not;
When the negative pressure value is a continuously changing value, the dust material level in the dust hopper does not reach the air suction height of the pressure taking pipe, and the negative pressure value measured by the negative pressure transmitter and transmitted to the negative pressure transmitter is continuously received;
When the negative pressure value is zero or a fixed value, the dust level in the dust hopper reaches the air suction height of the pressure taking pipe, and the power of the induced draft fan and the dust conveying rate of the tail flue of the hearth are increased;
When the negative pressure numerical value measured and transmitted by the negative pressure transmitter is not received, the valve is opened, and the dust flow numerical value is detected by the receiving gas flow monitor.
In the embodiment of the invention, the pressure taking pipe group is arranged on the dust hopper, the pressure difference between the atmosphere and the air pressure generated in the dust hopper dust removal and conveying process and the air pressure in the atmosphere is directly expressed through the pressure taking pipe group, then the pressure in the pressure taking pipe group is measured by the negative pressure transmitter, the dust accumulation height in the dust hopper is judged according to the detected negative pressure value through detecting the negative pressure in the dust hopper, the operation and judgment of a worker are facilitated, and the dust accumulation height in the dust hopper is quickly obtained.
Drawings
In order to more clearly illustrate the technical solutions of embodiments or examples of the present invention, the drawings that are required to be used in the embodiments or examples of the present invention will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained from those shown in the drawings without inventive effort to those skilled in the art.
FIG. 1 is a schematic diagram of a negative pressure dust collector of the present invention;
Fig. 2 is a schematic flow chart of the negative pressure dust removing method of the invention.
Numbering: 1. the device comprises a dust removing hopper, a blocking prevention device, a pressure taking pipe, a negative pressure transmitter and a valve, wherein the dust removing hopper, the blocking prevention device, the pressure taking pipe, the negative pressure transmitter and the valve are arranged in sequence.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
As shown in fig. 1, the present invention provides a negative pressure dust removing device, which is installed between an outlet of an induced draft fan and an inlet of a furnace tail flue, and the negative pressure dust removing device includes:
The dust removing hopper 1 is arranged between an outlet of the induced draft fan and an inlet of the hearth tail flue, and the dust removing hopper 1 is narrowed from a connection position with the induced draft fan to a connection position with the hearth tail flue, wherein at least one standard pressure taking port is formed in a side wall of the dust removing hopper 1;
The pressure taking pipe 3 comprises at least one pressure taking pipe 3, one end of the pressure taking pipe 3 penetrates through the standard pressure taking port to enter the dust hopper 1, the other end of the pressure taking pipe 3 is positioned outside the dust hopper 1, and the end part of the pressure taking pipe 3 is connected with a valve 5;
The negative pressure transmitter 4 is used for measuring the pressure in the pressure taking pipe 3, the branch section is led out from one side of the pressure taking pipe 3 outside the dust removing bucket 1 and is connected with the negative pressure transmitter 4, and the negative pressure transmitter 4 is electrically connected with the dust removing control system.
In this embodiment, the dust removing hopper 1 is located between the outlet of the induced draft fan and the inlet of the furnace tail flue, and is used for performing transition dust removal by using the induced draft fan and transmitting the induced draft to the furnace tail flue for use. The dust removing hopper 1 is in a gradually narrowed circular hopper shape, namely the dust removing hopper 1 is a circular hopper column, a through pipe is arranged in the dust removing hopper 1, two ends of the dust removing hopper are large and small, the large caliber of the dust removing hopper 1 is connected with a draught fan, and the small caliber of the dust removing hopper 1 is connected with a tail flue of a hearth. The inside of the round bucket-shaped dust hopper 1 is also round, so that dead angle accumulation dust in the dust hopper 1 is avoided, and the dust can slide off from the dust hopper 1 conveniently. In the present application, the dust collecting hopper 1 includes at least one pressure collecting port, preferably, in this embodiment, two pressure collecting ports are disposed in the dust collecting hopper 1, which are respectively a standard pressure collecting port and a limit pressure collecting port, the limit pressure collecting port is located at one side of the standard pressure collecting port close to the induced draft fan, wherein the dust collecting hopper 1 is placed with a small caliber facing the ground, that is, the limit pressure collecting port is set higher than the standard pressure collecting port, and by disposing two limit pressure collecting ports with a height difference and the standard pressure collecting port, the dust accumulation height in the dust collecting hopper 1 is verified twice, so that the safety in the dust collecting hopper 1 and the accuracy of judging the dust accumulation height are increased, of course, the limit pressure collecting port can be disposed directly above or slightly above the standard pressure collecting port, and the two pressure collecting ports are disposed in the dust collecting hopper 1, and the number requirement and the setting position of the specific pressure collecting ports are set according to the requirement of a user.
The pressure taking pipe 3 group comprises at least one pressure taking pipe 3, one end of the pressure taking pipe 3 penetrates through a standard pressure taking port to enter the dust hopper 1, the other end of the pressure taking pipe 3 is located outside the dust hopper 1, a valve 5 is connected to the end of the pressure taking pipe, a unidirectional airtight space in the pressure taking pipe 3 is created by the valve 5, dust sucked through negative pressure in the pressure taking pipe 3 is prevented from escaping, the pressure taking pipe 3 is a U-shaped pipe, the bent part of the pressure taking pipe 3 is located at the standard pressure taking port, the pressure taking pipe 3 is integrally hung upside down at the dust hopper 1, a pressure gauge is manufactured through the U-shaped pipe, the main principle is that the pressure gauge is manufactured according to a communicating vessel, when two ends of the U-shaped pipe are in contact with the atmosphere, the pressure of the two ends is the atmospheric pressure, the liquid level heights of the two ends are the same, when the pressure of one end of the U-shaped pipe is greater than or less than the atmospheric pressure, the liquid level heights of the two ends of the U-shaped pipe are different, and the pressure value can be read according to the height difference. The setting quantity of the pressure taking pipes 3 in the pressure taking pipe 3 group is determined according to the setting quantity of the pressure taking ports in the dust hopper 1, in the embodiment, two pressure taking pipes 3 (respectively, a limit pressure taking pipe 3 and a standard pressure taking pipe 3) are arranged, wherein the standard pressure taking pipe 3 penetrates through the standard pressure taking port, the limit pressure taking pipe 3 penetrates through the limit pressure taking port, the setting of the two pressure taking pipes 3 performs duplicate verification on dust accumulation height in the dust hopper 1, and the safety in the dust hopper 1 is increased and the accuracy of judging the dust accumulation height is improved. In this embodiment, the valve 5 is a ball valve 5.
In order to prevent blockage in the pressure taking pipe 3, an anti-blocking device 2 is arranged in the pressure taking pipe 3, and the anti-blocking device 2 is positioned at the bending part of the pressure taking pipe 3. Specifically, in an embodiment, the anti-blocking device 2 is an anti-blocking sampler, the outer side of the bend of the pressure taking pipe 3 is provided with an anti-blocking opening, the sampling end of the anti-blocking sampler is connected into the anti-blocking opening, the anti-blocking sampler is internally provided with a cyclone anti-blocking special structure, dust airflow enters the pipe orifice of the pressure taking pipe 3, then enters the cyclone sub-separator along the tangential direction of the pipe wall of the pressure taking pipe 3, and then rotates upwards and downwards along the pipe wall, fly ash is thrown onto the pipe wall under the action of gravity in the rotating process, falls into the dust hopper 1 along the pipe wall under the action of gravity, and is blocked from impact after entering the anti-blocking sampler according to the gas flow principle, and flows back layer by layer through the anti-blocking device 2 with three layers of special requirements, dust is separated layer by layer, and sundries and particle dust contained in gas are enabled to fall down to the bent end of the pressure taking pipe 3 to the pipe orifice of the pressure taking pipe 3 due to the fact that the specific gravity of the dust is greater than that the gas, thus the upward flowing dust gas can be purified, and the anti-blocking sampling purpose is achieved.
In another embodiment, the anti-blocking device 2 comprises: the dust collecting device comprises a motor, a rotary handle and a rotary brush rod, wherein one end of the rotary handle is connected with the motor, an anti-blocking opening is formed in the outer side of the bending of the pressure collecting tube 3, the rotary brush rod extends into the pressure collecting tube 3 from the anti-blocking opening, the rotary brush rod comprises a synchronous section and a dust brushing section, the synchronous section of the rotary brush rod is located on the outer side of the dust collecting bucket 1, the synchronous section is connected with the other end of the rotary handle, the dust brushing section is located on the inner side of the dust collecting bucket 1, and dust collecting blocks arranged in a staggered mode are wound outside the dust brushing section. The motor outputs and rotates to drive the rotary handle to rotate, and then the rotary handle synchronously drives the rotary brush rod to rotate, so that dust removal blocks in the rotary brush rod clean dust blocked in the pressure taking pipe 3 when rotating. The motor is directly connected with the rotary brush rod, so that the rotary handle is arranged between the motor and the rotary brush rod, the rotary handle of a vulnerable product is convenient to replace, and the motor and the rotary brush rod can be directly connected. The synchronous relationship between the rotary handle and the rotary brush rod can be that the synchronous gear drives synchronous or coaxial rotation.
In order to verify whether the pressure taking pipe 3 is located at one side end of the valve 5 and is out of gas, a gas flow monitor is arranged at one side end of the pressure taking pipe 3 located at the valve 5, and the gas flow condition of the pressure taking pipe 3 located at one side end of the valve 5 is monitored by the gas flow monitor. When the gas flow monitor detects a change value, it is indicated that the negative pressure in the dust hopper 1 is continuously changed, the pressure taking pipe 3 is located at one side of the valve 5 and is flowed out by dust gas, when the gas flow monitor detects a fixed value, it is indicated that the pressure taking pipe 3 is located at one side of the valve 5 and is in normal air circulation, and when the gas flow monitor detects no value, it is indicated that the pressure taking pipe 3 is located at one side of the valve 5 and is sealed well.
The negative pressure transmitter 4 is used for detecting the pressure in the pressure taking pipe 3, the pressure in the pressure taking pipe 3 directly acts on the diaphragm of the negative pressure transmitter 4, so that the diaphragm generates micro displacement in direct proportion to the pressure of the medium, the resistance of the negative pressure transmitter 4 is changed, and then the electronic circuit is used for detecting the change and converting the change into a standard signal corresponding to the pressure. In this embodiment, the negative pressure transmitter 4 is installed at each pressure taking pipe 3, and the branch section is led out from one side of the pressure taking pipe 3 outside the dust collecting bucket 1 to connect with the negative pressure transmitter 4, the negative pressure transmitter 4 is electrically connected with the dust collecting control system, that is, the negative pressure transmitter 4 transmits the measured negative pressure value to the dust collecting control system, and the dust collecting control system determines the dust accumulation height in the dust collecting bucket 1 according to the negative pressure value.
In this embodiment, through installing pressure tube 3 group on dust hopper 1, through the atmospheric pressure that produces with the dust hopper 1 dust removal material in-process and the atmospheric pressure in the atmosphere between the pressure tube 3 group of pressure, carry out direct expression through pressure tube 3 group, measure the pressure in the pressure tube 3 group by negative pressure transmitter 4 again, through detecting the negative pressure in the dust hopper 1, judge the pile up height of dust in the dust hopper 1 by the negative pressure numerical value that detects, make things convenient for staff's operation and judgement, acquire the pile up height of dust in the dust hopper 1 fast.
According to the negative pressure dust removing device, the present application proposes a negative pressure dust removing method, as shown in fig. 2, which is applied to the negative pressure dust removing device, and in order to avoid repetition, specific structures of the negative pressure dust removing device are not listed one by one in the present embodiment. In this embodiment, the negative pressure dust removal method includes the steps of:
Step S100, when the induced draft fan is started, a valve at the tail end of the pressure taking pipe is closed;
Step S200, receiving the negative pressure value measured and transmitted by the negative pressure transmitter;
judging whether the negative pressure value is normal or not;
Step S300, when the negative pressure value is a value which continuously changes, the dust material level in the dust hopper does not reach the air suction height of the pressure taking pipe, and the negative pressure value measured by the negative pressure transmitter and transmitted to the dust collecting pipe is continuously received;
Step S400, when the negative pressure value is zero or a fixed value, the dust level in the dust hopper reaches the air suction height of the pressure taking pipe, and the power of the induced draft fan and the dust conveying rate of the tail flue of the hearth are increased;
And S500, when the negative pressure value measured and transmitted by the negative pressure transmitter is not received, opening a valve, and detecting the dust flow value by the receiving gas flow monitor.
The pressure gauge is manufactured through the U-shaped pipe, the main principle is that the pressure gauge is manufactured according to the communicating vessel, when the two ends of the U-shaped pipe are contacted with the atmosphere, the pressure at the two ends is the atmospheric pressure, the liquid levels at the two ends are the same, when the pressure at the other end of the U-shaped pipe contacted with the atmosphere is greater than or less than the atmospheric pressure, the liquid levels at the two ends of the U-shaped pipe are different, and the pressure value can be read according to the height difference. The setting quantity of the pressure taking pipes in the pressure taking pipe group is determined according to the setting quantity of the pressure taking ports in the dust hopper, in the embodiment, two pressure taking pipes (respectively a limit pressure taking pipe and a standard pressure taking pipe) are arranged, wherein the standard pressure taking pipe penetrates through the standard pressure taking port, the limit pressure taking pipe penetrates through the limit pressure taking port, the setting of the two pressure taking pipes performs duplicate verification on dust accumulation height in the dust hopper, and the safety in the dust hopper is increased and the accuracy of judging the dust accumulation height is improved.
The specific verification mode is as follows: the negative pressure transmitter measures the negative pressure value in the sampling tube and transmits the measured negative pressure value to the dust removal control system, and the dust removal control system judges the dust accumulation height in the dust removal hopper according to the negative pressure value, namely when the negative pressure value is a continuously changing value, the dust material level in the dust removal hopper does not reach the air suction height of the pressure taking tube, continuously receives the negative pressure value measured and transmitted by the negative pressure transmitter, and indicates that the accumulation height of the dust material level in the dust removal hopper is continuously increased, so that the negative pressure in the dust removal hopper is continuously increased; when the negative pressure value is zero or a fixed value, the dust level in the dust removing hopper reaches the air suction height of the pressure taking pipe, the power of the induced draft fan and the dust conveying speed of the tail flue of the hearth are increased, the dust level in the dust removing hopper reaches the material taking height of the material taking pipe, the dust removing control system is used for increasing the dust discharging, and the dust accumulation height in the dust removing hopper is reduced; when the negative pressure numerical value measured and transmitted by the negative pressure transmitter is not received, the valve is opened, and the dust flow numerical value is detected by the receiving gas flow monitor, so that the negative pressure transmitter is in fault or the material taking pipe is blocked.
Preferably, after the step of opening the valve when the negative pressure value measured by the negative pressure transmitter and transmitted to the negative pressure transmitter is not received and the step of detecting the dust flow value by the receiving gas flow monitor, the negative pressure dust removing method further includes:
When the dust flow value is a continuously-changing value, the negative pressure transmitter fails, a negative pressure transmitter failure prompt is given, and if the material taking pipe is not blocked, the negative pressure value measured and transmitted by the negative pressure transmitter is not received because of the negative pressure transmitter failure, the negative pressure transmitter failure is prompted, so that the working personnel can conveniently perform symptomatic treatment;
When the dust flow value is zero or a fixed value, the pressure taking pipe is blocked, and the anti-blocking device is started.
Specifically, in an embodiment, the anti-blocking treatment method of the anti-blocking device includes: the anti-blocking sampler is internally provided with a cyclone anti-blocking special structure, dust airflow enters the pipe orifice of the pressure taking pipe, enters the cyclone sub-separator along the tangential direction of the pipe wall of the pressure taking pipe, then rotates upwards and downwards along the pipe wall, fly ash is thrown onto the pipe wall due to the gravity inertia effect in the rotating process, falls into a dust hopper along the pipe wall due to the gravity effect, and according to the gas flow principle, dust enters the anti-blocking sampler and then is blocked from impact, and passes through the anti-blocking device with three layers of special requirements to flow back layer by layer, dust is separated layer by layer, sundries and particle dust contained in the gas fall down to the bent end of the pressure taking pipe to the pipe orifice of the pressure taking pipe due to the fact that the specific gravity of the dust is greater than that of the gas, and therefore the dust gas flowing upwards can be purified, and the anti-blocking sampling purpose is achieved.
In another embodiment, an anti-blocking device includes: the device comprises a motor, a rotary handle and a rotary brush rod, wherein one end of the rotary handle is connected with the motor, an anti-blocking opening is formed in the outer side of the bending of the pressure taking pipe, the rotary brush rod extends into the pressure taking pipe from the anti-blocking opening, the rotary brush rod comprises a synchronous section and a dust brushing section, the synchronous section of the rotary brush rod is positioned at the outer side of a dust removing bucket, the synchronous section is connected with the other end of the rotary handle, the dust brushing section is positioned at the inner side of the dust removing bucket, and a dust removing block arranged in a staggered manner is wound outside the dust brushing section. The motor outputs and rotates to drive the rotary handle to rotate, and then the rotary handle synchronously drives the rotary brush rod to rotate, so that dust removal blocks in the rotary brush rod can clean dust blocked in the pressure taking pipe when rotating.
Preferably, when the negative pressure values measured and transmitted by the two negative pressure transmitters are received, and when the negative pressure values are zero or fixed, the dust level in the dust hopper reaches the air suction height of the pressure taking pipe, and after the step of increasing the power of the induced draft fan and the dust conveying rate of the tail flue of the hearth, the negative pressure dust removing method further comprises the following steps:
distinguishing the suction heights of the pressure taking pipes measured by the two negative pressure transmitters, taking the pressure taking position of the relatively high pressure taking pipe as a limit pressure taking position, correspondingly taking the negative pressure measured at the limit pressure taking position as a high negative pressure value, taking the pressure taking position of the relatively low pressure taking pipe as a standard pressure taking position, and correspondingly taking the negative pressure measured at the standard pressure taking position as a low negative pressure value;
When the low negative pressure value measured by the low pressure taking pipe is zero or a fixed value, combining the high negative pressure value measured by the high pressure taking pipe; when the high negative pressure value is a continuously changing value, the dust material level in the dust hopper does not reach the limit pressure taking position, and the high negative pressure value is continuously received; when the high negative pressure value is zero or a fixed value, the dust level in the dust hopper reaches the limit pressure-taking position of the pressure-taking pipe, the working of the induced draft fan is stopped, the dust gas in the dust hopper is stopped from flowing in, the dust accumulation is further reduced, and the dust is continuously removed into the tail flue of the hearth; when the high negative pressure value measured and transmitted by the negative pressure transmitter is not received, the valve is opened, and the dust flow value is detected by the receiving gas flow monitor.
In this embodiment, through installing the pressure tube group of getting on the dust hopper, through the atmospheric pressure that produces with the dust hopper dust removal material in-process and the atmospheric pressure in the atmosphere between the pressure, carry out direct expression through getting the pressure tube group, measure the pressure of getting in the pressure tube group by the negative pressure transmitter again, through detecting the negative pressure in the dust hopper, judge the pile-up height of dust in the dust hopper by the negative pressure numerical value that detects, make things convenient for staff's operation and judgement, acquire the pile-up height of dust in the dust hopper fast.
The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all equivalent modifications made by the present description and accompanying drawings, or direct/indirect application in other relevant technical fields are included in the scope of the present invention.
Claims (3)
1. The negative pressure dust removing method is implemented by adopting a negative pressure dust removing device which is arranged between an outlet of a draught fan and an inlet of a tail flue of a hearth, and is characterized in that the negative pressure dust removing device comprises:
The dust removing hopper is arranged between the outlet of the induced draft fan and the inlet of the hearth tail flue, and is narrowed from the connection position with the induced draft fan to the connection position with the hearth tail flue, wherein the side wall of the dust removing hopper is provided with at least one standard pressure taking port; the pressure taking pipe group comprises at least one pressure taking pipe, one end of the pressure taking pipe penetrates through the standard pressure taking port to enter the dust removing bucket, and the other end of the pressure taking pipe is positioned outside the dust removing bucket and is connected with a valve at the end part; the negative pressure transmitter is used for measuring the pressure in the pressure taking pipe, a bifurcation section is led out from one side of the pressure taking pipe, which is positioned outside the dust removing hopper, and is connected with the negative pressure transmitter, and the negative pressure transmitter is electrically connected with the dust removing control system;
The side wall of the dust hopper is also provided with a limit pressure taking port, and the limit pressure taking port is positioned at one side of the standard pressure taking port close to the induced draft fan; the pressure taking pipe group comprises two pressure taking pipes, one pressure taking pipe passes through the standard pressure taking port, and the other pressure taking pipe passes through the limit pressure taking port;
the pressure taking pipe is a U-shaped pipe, and the bending part of the pressure taking pipe is positioned at the standard pressure taking port, so that the pressure taking pipe is integrally and reversely hung at the dust removing bucket;
an anti-blocking device is arranged in the pressure taking pipe and is positioned at the bending part of the pressure taking pipe;
The anti-blocking device is an anti-blocking sampler, an anti-blocking opening is formed in the outer side of the bending of the pressure taking pipe, and the sampling end of the anti-blocking sampler is connected into the anti-blocking opening;
The anti-blocking device comprises: a motor; a rotary handle, one end of which is connected with the motor; the rotary brush rod comprises a synchronous section and a dust brushing section, the synchronous section of the rotary brush rod is positioned at the outer side of the dust removing bucket, the synchronous section is connected with the other end of the rotary handle, the dust brushing section is positioned at the inner side of the dust removing bucket, and the dust removing section is externally wound with dust removing blocks arranged in a staggered manner;
the end of the pressure taking pipe, which is positioned at one side of the valve, is connected with a gas flow monitor;
The negative pressure dust removing method comprises the following steps: when the induced draft fan is started, a valve at the tail end of the pressure taking pipe is closed; receiving the negative pressure value measured by the negative pressure transmitter and transmitted to the negative pressure transmitter; judging whether the negative pressure value is normal or not; when the negative pressure value is a continuously changing value, the dust material level in the dust hopper does not reach the air suction height of the pressure taking pipe, and the negative pressure value measured by the negative pressure transmitter and transmitted to the negative pressure transmitter is continuously received; when the negative pressure value is zero or a fixed value, the dust level in the dust hopper reaches the air suction height of the pressure taking pipe, and the power of the induced draft fan and the dust conveying rate of the tail flue of the hearth are increased; when the negative pressure numerical value measured and transmitted by the negative pressure transmitter is not received, the valve is opened, and the dust flow numerical value is detected by the receiving gas flow monitor.
2. The negative pressure dust removing method according to claim 1, wherein after the step of opening the valve when the negative pressure value measured by the negative pressure transmitter and transmitted thereto is not received and the dust flow value is detected by the receiving gas flow monitor, the negative pressure dust removing method further comprises: when the dust flow value is a value which continuously changes, the negative pressure transmitter fails, and a negative pressure transmitter failure prompt is given; when the dust flow value is zero or a fixed value, the pressure taking pipe is blocked, and the anti-blocking device is started.
3. The negative pressure dust removing method according to claim 2, wherein when the negative pressure values measured and transmitted by the two negative pressure transmitters are received, and when the negative pressure values are zero or fixed, the dust level in the dust removing hopper reaches the suction height of the pressure taking pipe, and after the step of increasing the power of the induced draft fan and the dust conveying rate of the tail flue of the furnace, the negative pressure dust removing method further comprises: distinguishing the suction heights of the pressure taking pipes measured by the two negative pressure transmitters, taking the pressure taking position of the relatively high pressure taking pipe as a limit pressure taking position, correspondingly taking the negative pressure measured at the limit pressure taking position as a high negative pressure value, taking the pressure taking position of the relatively low pressure taking pipe as a standard pressure taking position, and correspondingly taking the negative pressure measured at the standard pressure taking position as a low negative pressure value; when the low negative pressure value measured by the low pressure taking pipe is zero or a fixed value, combining the high negative pressure value measured by the high pressure taking pipe; when the high negative pressure value is a continuously changing value, the dust material level in the dust hopper does not reach the limit pressure taking position, and the high negative pressure value is continuously received; when the high negative pressure value is zero or a fixed value, the dust level in the dust hopper reaches the limit pressure taking position of the pressure taking pipe, and the induced draft fan stops working; when the high negative pressure value measured and transmitted by the negative pressure transmitter is not received, the valve is opened, and the dust flow value is detected by the receiving gas flow monitor.
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| CN114984667A (en) | 2022-09-02 |
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