CN111450626A - Smoldering and explosion resistant inerting seal system and method in filter - Google Patents
Smoldering and explosion resistant inerting seal system and method in filter Download PDFInfo
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- CN111450626A CN111450626A CN202010239216.9A CN202010239216A CN111450626A CN 111450626 A CN111450626 A CN 111450626A CN 202010239216 A CN202010239216 A CN 202010239216A CN 111450626 A CN111450626 A CN 111450626A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/023—Pockets filters, i.e. multiple bag filters mounted on a common frame
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0084—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours provided with safety means
- B01D46/0091—Including arrangements for environmental or personal protection
- B01D46/0093—Including arrangements for environmental or personal protection against fire or explosion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/04—Cleaning filters
Abstract
The invention relates to a smoldering and explosion preventing inert sealing system and method in a filter, which comprises a bag-type dust remover, an intermediate material box connected with a dust outlet pipe, a P L C controller and a nitrogen inlet pipe, wherein the valve control is carried out before dust gas enters the bag-type dust remover, a check valve is designed at a purified gas outlet processed by the bag-type dust remover, and purified gas is discharged by an induced draft fan after passing through the check valve.
Description
Technical Field
The invention relates to a smoldering-proof and explosion-proof inert sealing system and method in a filter, belonging to the technical field of environmental protection.
Background
The bag-type dust collector can meet different filtering working conditions in the using process, and when the filtered dust has smoldering, burning and explosion properties, the safe operation of the dust collector is influenced. In order to meet the requirement of safe operation of the dust remover under different working conditions, the problem of smoldering or burning of dust particles in a cabin of the dust remover is one of measures for safe operation of the dust remover. The method is also a main subject of research on the vacuum explosion-proof dust remover in recent years by our company.
The dust of the bag-type dust collector is blocked by the bag in the filtering process, the dust is continuously gathered along with the increase of the filtering time to generate the change of the pressure difference, after the preset pressure difference value is reached, the pressure difference signal controls the pulse valve to work to carry out pulse injection on the bag, the dust adsorbed on the outer surface of the bag is dropped into the ash bucket to be gathered under the action of the injected gas, and the dust is periodically discharged and transferred when the dust is gathered to the set material level height.
In a dry dust collector chamber, dust with smoldering gradually forms deposits in the process of gathering, the dust is captured and the heat release phenomenon can occur in the accumulation process, and in addition, the dust stored in an ash hopper has certain smoldering conditions to finally form combustion and explosion due to certain temperature influence of the filtering working condition.
The existing method for controlling dust smoldering and bag-type combustion of the bag-type dust remover is spraying, a temperature sensor is adopted to control spraying water or saturated steam to cool, the condition that a plurality of dust removers are used in a long place and the saturated steam is not provided is good, the control method is difficult to control the appropriate flow value of the saturated steam, and the humidity of dust gas is easily caused to exceed the maximum allowable value of the bag-type dust remover. When the dust remover is burnt at high temperature, once spray fire fighting is adopted, the manufacturing cost of the scrapped filter bag of the dust remover is 30-40% of the total price of the dust remover. Meanwhile, the dust remover is sprayed for fire control, so that sewage discharge is generated, and the safe operation of peripheral electrical equipment is influenced. So a more scientific control method is required for substitution.
Disclosure of Invention
The invention aims to provide a smoldering and explosion preventing inert sealing system in a filter, which solves the problems that the smoldering prevention of the existing dust remover is easy to cause filter bag damage and water pollution by utilizing spraying treatment.
The invention relates to an inert sealing system for preventing smoldering and explosion in a filter, which comprises a bag-type dust collector, wherein the bag-type dust collector is provided with an air inlet pipe, an air outlet pipe, a dust outlet pipe, a filter bag and a pulse electromagnetic valve, the air outlet pipe is connected with a draught fan, the pulse electromagnetic valve is connected with a compressed air inlet pipe, the inert sealing system also comprises an intermediate material box, a P L C controller and a nitrogen inlet pipe, the intermediate material box is connected with the dust outlet pipe, the bag-type dust collector is internally provided with a pressure transmitter and a temperature transmitter, the air inlet pipe is provided with an oxygen content sensor, the dust outlet pipe is provided with an electric control valve I, the nitrogen inlet pipe is communicated with the bag-type dust collector, the nitrogen inlet pipe is provided with an electric control valve II, the upper part of the bag-type dust collector is connected with the upper part of the intermediate material box through a vent pipe, the vent pipe is provided with an electric control valve III, the bottom end of the vent pipe is connected with an exhaust pipe, the exhaust pipe is provided with an electric control valve IV on the exhaust pipe, the exhaust pipe is provided with an electric control valve IV, the exhaust pipe is provided with a check valve III, the exhaust pipe is provided with an electric control valve III, the check valve III, the exhaust pipe is provided with the check valve, the exhaust pipe, the P L C controller, the exhaust pipe, the electric control valve is provided with the check valve, the exhaust pipe, the electric control valve is provided with the electric control valve, the check valve, the exhaust pipe, the check valve is provided with the electric control valve III check valve, the exhaust pipe, the exhaust valve, the exhaust pipe, the exhaust valve is provided with the exhaust valve, the.
Preferably, the lower part of the bag-type dust collector is provided with a low level indicator, the upper part of the middle material box is provided with a high level indicator, and the low level indicator and the high level indicator are both connected with a P L C controller.
Preferably, the second electric control valve, the third electric control valve and the fourth electric control valve are all electric ball valves, the first electric control valve comprises a pneumatic gate arranged on the dust removal pipe, the pneumatic gate is connected with a first electromagnetic valve through a pipeline, the other end of the electromagnetic valve is connected with a compressed air inlet pipe through a pipeline, and the first electromagnetic valve is connected with a P L C controller.
Preferably, a pneumatic bin wall vibrator is fixed on the side wall of the lower portion of the intermediate bin, the pneumatic bin wall vibrator is connected with a second electromagnetic valve, the second electromagnetic valve is connected with a compressed air inlet pipe, and the second electromagnetic valve is further electrically connected with a P L C controller.
Preferably, the bottom of middle workbin is equipped with the blowing pipe, is equipped with the star type tripper on the blowing pipe, and the P L C controller is connected to the star type tripper, and the air intake department of draught fan is equipped with the filter, and dustproof dust gets into the draught fan.
The invention also provides a smoldering-proof and explosion-proof inert sealing method in the filter, which comprises the following steps:
firstly, dust-containing gas enters a bag-type dust collector from an air inlet pipe, is discharged from an induced draft fan after being filtered by a filter bag, and dust adsorbed on the surface of the filter bag is blown off by opening a pulse valve through a P L C controller;
secondly, dust is gathered in the bag-type dust collector, when the temperature reaches the set value of the temperature transmitter, a signal is sent to a P L C controller, a P L C controller opens a second electric control valve, nitrogen enters the bag-type dust collector, a check valve and an induced draft fan are closed, and the injected nitrogen forms a nitrogen sealing layer on the surface of the accumulated dust;
thirdly, increasing the pressure value in the bag-type dust collector along with the continuous entering of the nitrogen, providing a signal to a P L C controller when the pressure value is increased to a set value of a pressure transmitter, opening an electric control valve III through the P L C controller, introducing the nitrogen into an intermediate material box, opening an electric control valve I through a P L C controller, discharging the dust into the intermediate material box, closing the electric control valve I5-10 seconds after the dust reaches the low level indicator alarm, and storing the dust entering the intermediate material box in a nitrogen closed state at the moment;
the fourth step: and regularly discharging the dust in the intermediate material box to a dust packaging bag for packaging.
Preferably, in the third step, when the dust level of the intermediate bin is continuously increased, the nitrogen pressures of the bag-type dust remover and the intermediate bin are gradually increased, when the design pressure value is reached, the pressure transmitter transmits a signal to the P L C controller, the P L C controller opens the fourth electrically controlled valve to discharge overpressure gas, and when the pressure reaches the design pressure value, the fourth electrically controlled valve is closed.
Preferably, in the second step, when the oxygen content in the bag-type dust collector is greater than or equal to 10%, the oxygen content sensor transmits a signal to the P L C controller, the P L C controller opens the second electrically controlled valve to inject nitrogen into the bag-type dust collector, and the content in the bag-type dust collector is always controlled to be less than 10% by the oxygen content sensor.
Preferably, the star-shaped discharger is opened manually in the fourth step for discharging, the second electromagnetic valve can be opened manually after the dust is discharged, the pneumatic bin wall vibrator vibrates the middle bin to discharge the dust, and then the star-shaped discharger is closed manually.
Preferably, in the fourth step, when the material level reaches the high level gauge, a power generation signal is sent to the P L C controller, the P L C controller opens the star-shaped discharger to discharge the dust into the dust packaging bag, when the dust is discharged, the P L C controller controls to open the second electromagnetic valve, the pneumatic bin wall vibrator shakes the intermediate material box to discharge the dust, and then the star-shaped discharger is closed.
Compared with the prior art, the invention has the following beneficial effects.
1. The organic combination of temperature sensing, pressure sensing and oxygen concentration sensing is adopted, so that the problem that spraying is controlled by only depending on the temperature sensing is solved, explosion or fire disasters of the dust remover at certain smoldering and burning temperatures are prevented, and a prevention, alarm and treatment mechanism is established by considering all conditions of dust smoldering, burning and explosion.
2. The nitrogen in the petrochemical industry and the coal chemical industry is sufficient, and a nitrogen supply system is not required to be established independently, so that the existing resource conditions are fully utilized, and the safe operation of the dust remover is guaranteed;
3. the problem of the potential safety hazard that whole process system brought is caused to the sack filter effect that causes to spray the dust gas humidity that causes increases thoroughly, causes to operate the increase of pressure differential. The method is particularly prominent in coal chemical industry and petrochemical industry and is a problem which needs to be solved for industrial safety production.
4. The problem of the filter bag scrap that the increase of flue gas humidity or the soaking of water caused in the spraying control smoldering and combustion process is solved. The adoption of dry nitrogen gas for sealing treatment can continuously realize the prevention and control of dust smoldering and burning under the signal control of the sensor, the humidity of dust gas is controlled, the service life of the cloth bag and the service life of the metal structure part of the dust remover body are prolonged, and the use cost of the dust remover is reduced.
5. The injection of nitrogen reduces the temperature and oxygen content of dust, and fundamentally blocks two conditions of temperature and oxygen content necessary for smoldering of dust.
6. The nitrogen reduces the oxygen content in the filtered gas, reduces the oxidation speed of the filter bag and the bag cage, the strength of the filter bag and the bag cage is slowly attenuated, and the service life is prolonged.
7. The nitrogen inert sealing system can effectively control the smoldering problem of the dust collector, and the defects that a spraying method is used for controlling the filter bag scrapping and the filter bag needs to be stopped and replaced due to the smoldering of dust are overcome. The use cost of the bag-type dust collector and the production cost of the whole chemical system are reduced. The problem that the dust remover can continuously and safely operate when the smoldering accident state is processed is solved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure, 1, a compressed air inlet pipe, 2, a pulse electromagnetic valve, 3, a check valve, 4, a pressure transmitter, 5, a filter, 6, an induced draft fan, 7, a temperature transmitter, 8, a low material level meter, 9, a pneumatic gate, 10, a high material level meter, 11, a P L C controller, 12, a star discharger, 13, a pneumatic bin wall vibrator, 14, a second electromagnetic valve, 15, an intermediate material bin, 16, a fourth electronic control valve, 17, a first electromagnetic valve, 18, a second electronic control valve, 19, an air inlet pipe, 20, a bag-type dust collector, 21, a filter bag, 22, a nitrogen inlet pipe, 23, an oxygen content sensor, 24 and a third electronic control valve are arranged.
Detailed Description
The invention is further illustrated by the following examples and figures of the specification.
The smoldering-fire-proof explosion-proof inert sealing system in the filter shown in fig. 1 comprises a bag-type dust remover 20, wherein the bag-type dust remover 20 is provided with an air inlet pipe 19, an air outlet pipe, a dust outlet pipe, a filter bag 21 and a pulse electromagnetic valve 2, the air outlet pipe is connected with a draught fan 6, the pulse electromagnetic valve 2 is connected with a compressed air inlet pipe 1, the inert sealing system further comprises an intermediate bin 15 connected with the dust outlet pipe, a P L C controller 11 and a nitrogen inlet pipe 22, a pressure transmitter 4 and a temperature transmitter 7 are arranged in the bag-type dust remover 20, the air inlet pipe is provided with an oxygen content sensor 23, the dust outlet pipe is provided with a first electric control valve, the nitrogen inlet pipe 22 is communicated with the bag-type dust remover 20, the nitrogen inlet pipe 22 is provided with a second electric control valve 18, the upper part of the bag-type dust remover 20 is connected with the upper part of the intermediate bin 15 through a vent pipe, the vent pipe is provided with a third electric control valve, the bottom end of the vent pipe is connected with an exhaust pipe, the fourth electric control valve 16 is arranged on the exhaust pipe.
The lower part of sack cleaner 20 is equipped with low charge level indicator, and the upper portion of middle workbin 15 is equipped with high charge level indicator 10, and P L C controller 11 is all connected to low charge level indicator and high charge level indicator 10.
The second electric control valve 18, the third electric control valve and the fourth electric control valve 16 are all electric ball valves, the first electric control valve comprises a pneumatic gate 9 installed on a dust removal pipe, the pneumatic gate 9 is connected with a first electromagnetic valve 17 through a pipeline, the other end of the electromagnetic valve is connected with a compressed air inlet pipe 1 through a pipeline, and the first electromagnetic valve 17 is connected with a P L C controller 11.
The side wall of the lower part of the intermediate feed box 15 is fixed with a pneumatic bin wall vibrator 13, the pneumatic bin wall vibrator 13 is connected with a second electromagnetic valve 14, the second electromagnetic valve 14 is connected with a compressed air inlet pipe 1, the second electromagnetic valve 14 is also electrically connected with a P L C controller 11, the temperature transmitter 7 can be regulated and controlled at 0-500 ℃, and the oxygen content sensor can be regulated and controlled at 0-100%.
The bottom of middle workbin 15 is equipped with the blowing pipe, is equipped with star type tripper 12 on the blowing pipe, and P L C controller 11 is connected to star type tripper 12, and the air intake department of draught fan 6 is equipped with filter 5.
When an inflammable signal appears in an ash bin of the bag-type dust collector, the powder to be smoldered is quickly transferred to the intermediate bin through a P L C signal prompt, the signal is that when the temperature in a dust collector cabin reaches or is close to the smoldering temperature of dust through the temperature transmitter 11, not only the nitrogen inlet electric control valve II and the electric control valve III are opened, but also the pneumatic gate valve is opened, the powder is packaged and transferred to the intermediate bin, the intermediate bin can avoid smoldering of the powder in the dust collector cabin to cause the risk of combustion of a filter bag in the room, and the powder at the smoldering temperature can be discharged after being cooled through a cold area, otherwise, the powder close to the smoldering temperature is suddenly exposed in the air to cause flash or explosion, and the intermediate bin is equivalent to a cooling cold area.
The scheme mainly solves smoldering and explosive dust from a dust workshop, a storage bin, a coal powder production line, coal powder drying equipment and the top of the coal powder bin.
Because dusty gas has certain temperature (the temperature of different operating modes differs), the dust in the sack cleaner ash bucket receives the heat radiation that gets into the dusty gas at the in-process of storing, and the storage process production of dust self can produce self heat simultaneously, when the heat reaches the smoldering temperature of dust, can take place the smoldering, if can not in time effectual obtaining control, the smoldering will be transformed into burning or explosion accident. Because the inlet gas of the dust remover comes from the environments of a dust workshop, a storage bin, a coal powder production line, coal powder drying equipment and the like, the oxygen content is basically the same as that of air, and the temperature and the oxygen content can completely meet the condition of being divided into inflammable conditions.
Sufficient nitrogen resources in petrochemical industry and coal chemical industry are fully utilized (no matter petrochemical industry or coal chemical industry, nitrogen cannot be produced after the nitrogen leaves).
The invention also provides a smoldering-proof and explosion-proof inert sealing method in the filter, which comprises the following steps:
firstly, introducing dust-containing gas suspended in the place into a bag-type dust collector 20 from an air inlet pipe 19 through an induced draft fan or a Roots vacuum pump, filtering the dust by a filter bag 21, and then discharging the dust from the induced draft fan 6, wherein the dust is adsorbed on the surface of the filter bag, when the dust reaches a certain accumulation thickness, the pressure difference value of the gas passing through the filter bag is increased, and the dust adsorbed on the surface of the filter bag 21 is blown off by opening a pulse valve through a P L C controller;
and secondly, collecting dust in a bag-type dust collector 20, discharging and packaging the dust collected in a dust hopper of the bag-type dust collector to an intermediate bin at regular intervals, discharging and packaging the dust after the dust in the intermediate bin is collected to a certain material level height, completing a dust collection working period, if the temperature reaches the set value of a temperature transmitter 7 and the set value is that when the temperature reaches or approaches to the smoldering temperature of the dust (the smoldering temperature of different dust can be detected through corresponding tests and data), signaling to a P L C controller 11, opening an electric control valve II 18 by the P L C controller 11, introducing nitrogen into the bag-type dust collector 20, increasing the content and pressure of the nitrogen in the dust storage chamber, discharging air in the chamber, reducing the oxygen content, and blocking the smoldering or burning condition of the dust because the nitrogen is heat absorption gas, closing a check valve 3 and a draught fan 6, forming a closed layer on the surface of the dust deposited by the injected nitrogen, and ensuring that the gas does not flow (the dust gas at this time is discharged safely and belongs to the large technological considered range), controlling the smoldering condition and introducing the nitrogen gas into the dust storage chamber to absorb the temperature.
And thirdly, increasing the pressure value in the bag-type dust collector 20 along with the continuous entering of the nitrogen, providing a signal to a P L C controller 11 when the pressure value is increased to a set value of a pressure transmitter 4 (the working pressure is designed according to working conditions, the highest working pressure is determined through intensity calculation and is generally designed to be +/-5 KPa), opening an electric control valve III through the P L C controller 11, introducing the nitrogen into an intermediate bin 15, opening an electric control valve I through the P L C controller 11, discharging the dust into the intermediate bin 15, closing the electric control valve I5-10 seconds after the dust reaches the low level indicator alarm, storing the dust entering the intermediate bin 15 under the nitrogen closed state, opening a check valve at an outlet of the dust collector and a draught fan, and ensuring that the whole equipment can safely operate under the designed pressure, wherein a pressure sensor is adjustable at 0-10 KPa.
The fourth step: and regularly discharging the dust in the intermediate material box 15 to a dust packaging bag for packaging. The dust remover is ensured not to generate fire due to dust smoldering or burning under the working condition of use. Not only protects the self equipment of the dust remover, but also protects the safe operation of the petrochemical production area.
In the third step, when the dust material level of the intermediate material box 15 is continuously increased, the nitrogen pressure of the bag-type dust remover 20 and the intermediate material box 15 is gradually increased, when the design pressure value is reached, the pressure transmitter 4 transmits a signal to the P L C controller 11, the P L C controller 11 opens the fourth electric control valve 16 to discharge overpressure gas, and when the pressure reaches the design pressure value, the fourth electric control valve 16 is closed.
In the second step, when the oxygen content in the bag-type dust collector 20 is greater than or equal to 10%, the oxygen content sensor 23 transmits a signal to the P L C controller 11, the P L C controller 11 opens the second electrically controlled valve 18, nitrogen is injected into the bag-type dust collector 20, and the content in the bag-type dust collector is always controlled to be less than 10% by the oxygen content sensor 8.
And in the fourth step, the star-shaped discharger 12 is manually opened for discharging, after the dust is discharged, the second electromagnetic valve 14 can be manually opened, the pneumatic bin wall vibrator 13 vibrates the middle material box 15 to discharge the dust, and then the star-shaped discharger 12 is manually closed.
And in the fourth step, when the material level reaches the high level gauge 10, a power generation signal is sent to the P L C controller 11, the P L C controller 11 opens the star-shaped discharger 12 to discharge the dust into a dust packaging bag, when the dust is discharged, the P L C controller 11 controls to open the second electromagnetic valve 14, the pneumatic bulkhead vibrator 13 vibrates the intermediate material box 15 to discharge the dust, and then the star-shaped discharger 12 is closed.
In conclusion, the invention adopts the organic combination of the temperature sensing, the pressure sensing and the oxygen concentration sensing, solves the problem that the spraying is controlled by the temperature sensing alone, prevents the dust remover from explosion or fire at certain smoldering and burning temperatures, and establishes a prevention, alarm and treatment mechanism from the consideration of all conditions of dust smoldering, burning and explosion. The nitrogen in the petrochemical industry and the coal chemical industry is sufficient, and a nitrogen supply system is not required to be established independently, so that the existing resource conditions are fully utilized, and the safe operation of the dust remover is guaranteed; the problem of the potential safety hazard that whole process system brought is caused to the sack filter effect that causes to spray the dust gas humidity that causes increases thoroughly, causes to operate the increase of pressure differential. The method is particularly outstanding in coal chemical industry and petrochemical industry and is a problem which needs to be solved for industrial safety production; the problem of filter bag scrapping caused by smoke humidity increase or water soaking in the process of spray control smoldering and combustion is solved, dry nitrogen is adopted for sealing treatment, the prevention and control of dust smoldering and combustion can be continuously realized under the signal control of a sensor, the humidity of dust gas is controlled, the service life of a cloth bag and the service life of a metal structure part of a dust remover body are prolonged, and the use cost of the dust remover is reduced; the injection of nitrogen reduces the temperature and oxygen content of dust, and fundamentally blocks two conditions of temperature and oxygen content required by smoldering of the dust; the nitrogen reduces the oxygen content in the filtered gas, reduces the oxidation speed of the filter bag and the bag cage, the strength of the filter bag and the bag cage is slowly attenuated, and the service life is prolonged.
Of course, the inert gas in this application is not limited to nitrogen, and non-toxic gases such as carbon dioxide (CO2) which are neither flammable nor combustible may be used.
In the description of the present invention, the terms "inside", "outside", "longitudinal", "lateral", "up", "down", "top", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are for convenience only to describe the present invention without requiring the present invention to be necessarily constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Claims (10)
1. The smoldering-proof and explosion-proof inert sealing system in the filter comprises a bag-type dust collector (20), wherein the bag-type dust collector (20) is provided with an air inlet pipe (19), an air outlet pipe, a dust outlet pipe, a filter bag (21) and a pulse electromagnetic valve (2), the air outlet pipe is connected with a draught fan (6), and the pulse electromagnetic valve (2) is connected with a compressed air inlet pipe (1), and is characterized by further comprising an intermediate material box (15) connected with the dust outlet pipe, a P L C controller (11) and a nitrogen inlet pipe (22), a pressure transmitter (4) and a temperature transmitter (7) are arranged in the bag-type dust collector (20), an oxygen content sensor (23) is arranged on the air inlet pipe (19), a first electric control valve is arranged on the dust outlet pipe, the nitrogen inlet pipe (22) is communicated with the bag-type dust collector (20), a second electric control valve (18) is arranged on the nitrogen inlet pipe (22), the upper portion of the bag-type dust collector (20) is connected with the upper portion of the intermediate material box (15) through a vent pipe, a third electric control valve is arranged on the vent pipe, the vent pipe is connected with a vent pipe, the vent pipe is.
2. An in-filter smoldering-proof and explosion-proof inertia sealing system according to claim 1, characterized in that a low level gauge (8) is arranged at the lower part of the bag-type dust remover (20), a high level gauge (10) is arranged at the upper part of the intermediate bin (15), and both the low level gauge and the high level gauge (10) are connected with a P L C controller (11).
3. The smoldering-proof and explosion-proof inert sealing system in the filter as claimed in claim 1, wherein the second electric control valve (18), the third electric control valve and the fourth electric control valve (16) are all electric ball valves, the first electric control valve comprises a pneumatic gate (9) installed on a dust removal pipe, the pneumatic gate (9) is connected with a first electromagnetic valve (17) through a pipeline, the other end of the electromagnetic valve is connected with a compressed air inlet pipe (1) through a pipeline, and the first electromagnetic valve (17) is connected with a P L C controller (11).
4. The smoldering-and-explosion-proof inert sealing system in the filter as claimed in claim 1, wherein a pneumatic bulkhead rapper (13) is fixed on the lower side wall of said intermediate bin (15), said pneumatic bulkhead rapper (13) is connected with a second electromagnetic valve (14), said second electromagnetic valve (14) is connected with a compressed air inlet pipe (1), said second electromagnetic valve (14) is further electrically connected with a P L C controller (11).
5. The smoldering-and-explosion-proof inert sealing system in the filter as claimed in claim 4, wherein a discharging pipe is arranged at the bottom of the intermediate material box (15), a star discharger (12) is arranged on the discharging pipe, the star discharger (12) is connected with a P L C controller (11), and a filter (5) is arranged at an air inlet of the induced draft fan (6).
6. A smoldering and explosion preventing inert sealing method in a filter is characterized in that: the method comprises the following steps:
firstly, dust-containing gas enters a bag-type dust collector (20) from an air inlet pipe (19), is filtered by a filter bag (21) and then is discharged from a draught fan (6), and dust adsorbed on the surface of the filter bag (21) is blown off by opening a pulse valve through a P L C controller;
secondly, dust is gathered in the bag-type dust collector (20), when the temperature reaches the set value of the temperature transmitter (7), a signal is sent to the P L C controller (11), the P L C controller (11) opens the second electric control valve (18), nitrogen enters the bag-type dust collector (20), the check valve (3) and the draught fan (6) are closed, and the injected nitrogen forms a nitrogen sealing layer on the surface of the accumulated dust;
thirdly, with the continuous entering of nitrogen, the pressure value in the bag-type dust collector (20) rises, when the pressure value rises to the set value of the pressure transmitter (4), a signal is provided to the P L C controller (11), the electric control valve III is opened through the P L C controller (11), the nitrogen is introduced into the intermediate material box (15), the electric control valve I is opened through the P L C controller (11), the dust is discharged into the intermediate material box (15), when the dust reaches the low level indicator and alarms, the electric control valve I is closed for 5-10 seconds, and the dust entering the intermediate material box (15) is still stored in a nitrogen closed state;
the fourth step: and regularly discharging the dust in the intermediate material box (15) to a dust packaging bag for packaging.
7. The smoldering-proof and explosion-proof inert sealing method in the filter is characterized in that in the third step, the nitrogen pressure of the bag-type dust collector (20) and the intermediate bin (15) is gradually increased while the dust level of the intermediate bin (15) is continuously increased, when the designed pressure value is reached, the pressure transmitter (4) transmits a signal to a P L C controller (11), an electric control valve IV (16) is opened through the P L C controller (11), the overpressure gas is exhausted, and when the pressure reaches the designed pressure value, the electric control valve IV (16) is closed.
8. The smoldering-proof and explosion-proof inert sealing method in the filter as claimed in claim 6, wherein in the second step, when the oxygen content in the bag-type dust remover (20) is greater than or equal to 10%, the oxygen content sensor (23) transmits a signal to the P L C controller (11), the P L C controller (11) opens the second electrically controlled valve (18) to inject nitrogen into the bag-type dust remover (20), and the content in the bag-type dust remover is always controlled to be less than 10% by the oxygen content sensor (8).
9. A smoldering and explosion proof inerting method in a filter according to claim 6, wherein: and in the fourth step, the star-shaped discharger (12) is manually opened to discharge materials, after the dust is discharged, the second electromagnetic valve (14) can be manually opened, the pneumatic bin wall vibrator (13) vibrates the middle material box (15) to discharge the dust, and then the star-shaped discharger (12) is manually closed.
10. The smoldering-proof and explosion-proof inertia sealing method for the filter of claim 6, wherein in the fourth step, when the material level reaches the high level gauge (10), a power generation signal is sent to the P L C controller (11), the P L C controller (11) opens the star discharger (12) to discharge the dust into the dust packaging bag, when the dust is discharged, the P L C controller (11) controls to open the second electromagnetic valve (14), the pneumatic bulkhead vibrator (13) vibrates the intermediate material box (15), the dust is discharged, and then the star discharger (12) is closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010239216.9A CN111450626A (en) | 2020-03-30 | 2020-03-30 | Smoldering and explosion resistant inerting seal system and method in filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010239216.9A CN111450626A (en) | 2020-03-30 | 2020-03-30 | Smoldering and explosion resistant inerting seal system and method in filter |
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| CN111450626A true CN111450626A (en) | 2020-07-28 |
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| CN202010239216.9A Pending CN111450626A (en) | 2020-03-30 | 2020-03-30 | Smoldering and explosion resistant inerting seal system and method in filter |
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| CN (1) | CN111450626A (en) |
Cited By (1)
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