CN110686257A - Flue gas treatment equipment, control method, control device and asphalt mixing plant - Google Patents
Flue gas treatment equipment, control method, control device and asphalt mixing plant Download PDFInfo
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- CN110686257A CN110686257A CN201910886220.1A CN201910886220A CN110686257A CN 110686257 A CN110686257 A CN 110686257A CN 201910886220 A CN201910886220 A CN 201910886220A CN 110686257 A CN110686257 A CN 110686257A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
- E01C19/1009—Plant wherein type or construction of the mixer are irrelevant
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C2301/00—Machine characteristics, parts or accessories not otherwise provided for
- E01C2301/50—Methods or devices for preventing dust by spraying or sucking
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/14—Gaseous waste or fumes
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Abstract
The invention provides flue gas treatment equipment, a control method, a control device and an asphalt mixing plant, wherein the flue gas treatment equipment comprises: the air outlet of the first fan is communicated with the combustor, and the first fan conveys the flue gas to be treated to the combustion chamber of the drying part through the combustor; the drying part is communicated with the combustor and is used for combusting the flue gas discharged by the combustor; the combustor is internally provided with a second fan, and the first fan and the second fan work in a cooperative manner to adjust the airflow so as to reduce the disturbance of the first fan to the internal air pressure of the combustion chamber. According to the technical scheme, the smoke circulation effect can be optimized, the stability of the negative pressure environment of the drying part is improved, the combustion is promoted, and the heat loss of the drying part is reduced at the same time, so that the smoke treatment efficiency is improved.
Description
Technical Field
The invention relates to the technical field of pollutant treatment, in particular to a flue gas treatment device, a control method, a control device and an asphalt mixing plant.
Background
Under the background of positive response of 'winning blue sky guard war' around the country, direct emission of factory tail gas (pollutants) is prohibited by the open directive, and especially in recent 3 years, many factories are inspected and sealed because the smoke emission does not meet the environmental protection requirement. The harmless emission of the flue gas in the production process is always the key research direction of manufacturers. For example, a large amount of flue gas is generated in the production process of an asphalt mixing plant, the components of the flue gas comprise asphalt smoke, sulfur dioxide, nitrogen oxide, benzopyrene and the like, the easily polluted air is directly discharged, secondary combustion of the asphalt flue gas is an effective means for solving the problem, and at present, the simplest and most direct method is to directly introduce the flue gas into a drying part by using a centrifugal fan for combustion. But centrifugal fan's amount of wind can directly cause very big influence to the negative pressure environment of drying portion, and for maintaining drying portion negative pressure stable, the draught fan that is located drying portion low reaches takes out the amount of wind and must increase, can lead to a large amount of heats in the drying portion to be taken out, influences combustor combustion effect. The air quantity of the centrifugal fan influences the negative pressure of the drying roller, the air quantity of the draught fan is increased, a large amount of heat and available dust in the drying roller are sucked away, the combustion efficiency of a combustor is influenced, the use cost of a user is increased, and secondary pollution can be generated by retreating the drawn away available dust.
Moreover, any discussion of the prior art throughout the specification is not an admission that the prior art is necessarily known to a person of ordinary skill in the art, and any discussion of the prior art throughout the specification is not an admission that the prior art is necessarily widely known or forms part of common general knowledge in the field.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, it is an object of the present invention to provide a flue gas treatment device.
Another object of the present invention is to provide a control method.
Another object of the present invention is to provide a control device.
Another object of the present invention is to provide an asphalt mixing plant.
In order to achieve the above object, according to a first aspect of the present invention, there is provided a flue gas treatment apparatus comprising: the air outlet of the first fan is communicated with the combustor, and the first fan conveys the flue gas to be treated to the combustion chamber of the drying part through the combustor; the drying part is communicated with the combustor and is used for combusting the flue gas discharged by the combustor; the combustor is internally provided with a second fan, and the first fan and the second fan work in a cooperative manner to adjust the airflow so as to reduce the disturbance of the first fan to the internal air pressure of the combustion chamber.
In this technical scheme, first fan passes through the combustor and carries the flue gas of pending to the combustion chamber (the space of flue gas combustion reaction) of stoving portion inside, rather than the combustion chamber by the direct intercommunication drying portion of first fan, has improved the combustion effect on the one hand, and on the other hand has also reduced the influence that first fan amount of wind changes and brings the pressure environment of combustion chamber, guarantees that the amount of wind is steady, and the burning is abundant. The combustor is inside still to be equipped with the second fan, and first fan passes through the flue and inserts the combustor body, and first fan is as the partly of combustor, and second fan and first fan collaborative work ensure that the amount of wind satisfies the burning requirement while, the influence to combustion chamber negative pressure environment is reduced as far as possible. First fan and second fan all adopt frequency conversion control, compare in the technical scheme of prior art (first fan directly communicates to the combustion chamber), this application can also guarantee the combustion effect of combustion chamber and combustor under the condition of suitably reducing second fan power, improves flue gas treatment facility's work efficiency.
According to the above technical solution, the flue gas treatment equipment optionally further includes: and the inlet end of the dust remover is connected with the outlet end of the drying part and is used for reducing the content of solid particles in the flue gas.
In this technical scheme, the entry of dust remover links to each other with the export of stoving portion, and the flue gas gets into the dust remover after burning or drying in the stoving portion, further filters the solid particle thing in the flue gas, reduces the content of pollutant in the flue gas, improves flue gas treatment facility's environmental protection effect.
The flue gas treatment equipment according to any one of the above technical solutions, optionally, further includes: and an air inlet of the induced draft fan is connected with the outlet end of the dust remover and used for discharging the flue gas in the dust remover.
In the technical scheme, under the premise that the air quantity of the induced draft fan is not changed, the combustion effect of the combustor and the combustion chamber can be fully ensured through the cooperative work of the first fan and the second fan. Specifically, an air inlet (air extraction opening) of the induced draft fan extracts flue gas from the dust remover, promotes the gas circulation inside the dust remover and the drying part, maintains the negative pressure environment in the drying part, guides the flow direction of the flue gas, and discharges the treated flue gas.
The flue gas treatment equipment according to any one of the above technical solutions, optionally, further includes: and the air inlet of the induced draft fan is connected with the outlet end of the drying part and used for discharging flue gas in the drying part.
In this technical scheme, to some application scenarios, because the pollutant granule in the flue gas need not handle, at this moment, with the draught fan direct with stoving portion intercommunication, directly with the flue gas discharge through burning (or stoving) in the stoving portion, promote the air current flow in the stoving portion, form the negative pressure environment, improve flue gas treatment efficiency.
The flue gas treatment equipment according to any one of the above technical solutions, optionally, further includes: the first frequency converter is connected to the first fan and used for controlling the operating frequency of the first fan, and/or the second frequency converter is connected to the second fan and used for controlling the operating frequency of the second fan.
In the technical scheme, the first fan and the second fan can be controlled by a variable frequency control scheme, and the influence of uneven air volume distribution (air volume is intensively blown to the combustion chamber) of the first fan on the negative pressure environment of the combustion chamber is reduced as much as possible through the cooperative work of the first fan and the second fan. The frequency conversion control mode is favorable for programming control, improves the running efficiency of the fan and optimizes the blowing effect.
According to the flue gas treatment equipment in any one of the above technical schemes, optionally, the first fan is a centrifugal fan, the second fan is an axial flow fan, and the drying part is a drying drum.
In this technical scheme, centrifugal fan mixes combustion-supporting gaseous conveyor as the flue gas, and the intake is big, helps promoting combustion efficiency, and axial fan promotes that the flue gas flows and cushions and disperses the mist that centrifugal fan carried, reduces the negative pressure change that centrifugal fan directly blows the combustion chamber and brings, improves combustion efficiency.
According to a second aspect of the present invention, there is provided a control method for a flue gas treatment device, the flue gas treatment device including an axial flow fan and a centrifugal fan, the control method including: starting the axial flow fan to operate at a first frequency, and starting the centrifugal fan to operate at a second frequency; responding to an ignition instruction, controlling the axial flow fan to operate at a first frequency for a first time before an ignition action, reducing the first frequency to a third frequency of the axial flow fan after the first time, and reducing the second frequency to a fourth frequency of the centrifugal fan; executing an ignition action, and after the ignition is successful, increasing the operating frequency of the centrifugal fan to a fifth frequency after a second time period; responding to a fire stopping instruction, controlling the axial flow fan to operate at a sixth frequency for a third time period, and controlling the operating frequency of the axial flow fan to be reduced to a seventh frequency after the third time period; and closing the axial flow fan and the centrifugal fan.
In the technical scheme, in the starting stage of the treatment process, the axial flow fan operates at the initial frequency (first frequency) to purge the combustion chamber of the drying part for a first time (for example, 30 seconds), and the centrifugal fan also operates at the initial frequency (second frequency) during the first time, so that the combustion chamber is filled with combustible smoke. After receiving an ignition instruction, the axial flow fan and the centrifugal fan both operate at a reduced speed to improve the ignition success rate until ignition is successful, the flame is stabilized by continuing delaying for a certain time (for example, 3 seconds for the second time), and after combustion is stabilized, the operating frequency of the centrifugal fan and the axial flow fan is improved, so that normal fire adding or fire reducing can be performed. After receiving the shut down command, the axial flow fan time delays purging the combustion chamber at a sixth frequency for a third period of time (e.g., 120 seconds), and then reduces the frequency to a seventh frequency until the centrifugal and axial flow fans are completely shut down (de-energized).
According to the control method of the above technical solution, optionally, the method further includes: and starting an induced draft fan to promote airflow to flow, wherein the induced draft fan is arranged at the downstream of the airflow flowing direction of the centrifugal fan and the axial flow fan.
In the technical scheme, the action of starting the induced draft fan occurs before starting the axial flow fan and the centrifugal fan, the induced draft fan is started firstly to accelerate the gas circulation in the flue gas treatment equipment, a negative pressure environment of the drying part is formed, and the flue gas circulation is promoted.
According to the control method of any one of the above technical solutions, optionally, the first frequency is equal to a sixth frequency, the second frequency is equal to a fifth frequency, and the third frequency is equal to a seventh frequency.
In this solution, preferably: the first frequency is 25Hz, the second frequency is 50Hz, the third frequency is 15Hz, the fourth frequency is 20Hz, the fifth frequency is 50Hz, the sixth frequency is 25Hz, and the seventh frequency is 15 Hz.
According to an aspect of the third aspect of the present invention, there is provided a control apparatus including: the control method comprises a memory, a processor and a program stored on the memory and capable of running on the processor, wherein the program realizes the steps of the control method according to any one of the above technical schemes when being executed by the processor. The control device includes all the advantages of the control method according to any one of the above technical solutions, and is not described herein again.
According to an aspect of the fourth aspect of the present invention, there is also provided a computer-readable storage medium, on which a computer program is stored, the computer program, when executed, implementing the control method defined in any one of the above aspects.
According to a fifth aspect of the present invention, there is provided an asphalt mixing plant, comprising: asphalt mixing equipment; and the flue gas treatment equipment that any one of technical scheme provided above provided, wherein, the tail gas discharge port of pitch agitated vessel is connected to the income wind gap of flue gas treatment equipment's first fan.
In this embodiment, the pollutants such as asphalt smoke, sulfur dioxide, nitrogen oxide, benzopyrene are contained in a large amount of flue gas that pitch agitated vessel working process produced, and these flue gases are carried to the combustor through first fan and are burnt, and further burning or stoving is passed through the stoving portion again, optionally, follow-up particulate matter in the filter flue gas through the dust remover, and finally discharged by the draught fan to make the flue gas that discharges out at last reach the environmental protection requirement. In addition, the asphalt mixing plant has all the beneficial effects of the flue gas treatment equipment provided by any technical scheme, and the details are not repeated herein.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a schematic block diagram of a flue gas treatment plant according to one embodiment of the present invention;
FIG. 2 shows a schematic block diagram of a flue gas treatment plant according to another embodiment of the invention;
FIG. 3 shows a schematic diagram of the electrical control architecture of a flue gas treatment plant according to one embodiment of the invention;
FIG. 4 shows a schematic flow diagram of a control method according to an embodiment of the invention;
FIG. 5 shows a schematic flow chart of a control method according to a further embodiment of the invention;
FIG. 6 shows a schematic block diagram of a control device according to an embodiment of the present invention;
FIG. 7 shows a schematic block diagram of an asphalt mixing plant according to an embodiment of the present invention;
FIG. 8 shows a schematic block diagram of a computer-readable storage medium according to an embodiment of the invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Example one
As shown in fig. 1, a flue gas treatment apparatus 100 according to an embodiment of the present invention includes: the air outlet of the first fan 102 is communicated with the combustor 104, and the first fan 102 conveys the flue gas to be treated to the combustion chamber of the drying part 106 through the combustor 104; the drying part 106 is communicated with the combustor 104 and is used for combusting the flue gas discharged by the combustor 104; a second fan is provided inside the burner 104, and the first fan 102 and the second fan work together to adjust the air flow so as to reduce the disturbance of the first fan 102 to the internal air pressure of the combustion chamber.
In this embodiment, if the first fan 102 is directly connected to the combustion chamber, the uneven air distribution caused by the increased power of the first fan 102 will have a great influence on the negative pressure environment in the combustion chamber, so the air duct of the first fan 102 and the air duct of the second fan are combined together to form the combustor 104. The first fan 102 conveys the flue gas to be processed to a combustion chamber (flue gas combustion reaction space) in the drying part 106 through the combustor 104 instead of directly communicating the combustion chamber of the drying part 106 with the first fan 102, so that on one hand, the combustion effect is improved, on the other hand, the influence of the air volume change of the first fan 102 on the pressure environment of the combustion chamber is reduced, the air volume is ensured to be stable, and the combustion is sufficient. In addition, combustor 104 is inside still to be equipped with the second fan, and first fan 102 passes through the flue and inserts combustor 104 body, and first fan 102 is as a part of combustor 104, and second fan and first fan 102 collaborative work ensure that the amount of wind satisfies the burning requirement, reduce the influence to combustion chamber negative pressure environment as far as possible. First fan 102 and second fan all adopt frequency conversion control, compare in the technical scheme of prior art (first fan 102 directly communicates to the combustion chamber), this application can also guarantee the combustion effect of combustion chamber and combustor 104 under the condition that suitably reduces second fan power, improves flue gas treatment device's work efficiency.
The flue gas treatment apparatus 100 according to the above embodiment optionally further comprises: and the inlet end of the dust remover 108 is connected with the outlet end of the drying part 106 and is used for reducing the solid particle content in the flue gas.
In this embodiment, the inlet of the dust collector 108 is connected to the outlet of the drying part 106, and the flue gas enters the dust collector 108 after being burned or dried in the drying part 106, so as to further filter the solid particles in the flue gas, reduce the content of pollutants in the flue gas, and improve the environmental protection effect of the flue gas treatment equipment.
The flue gas treatment apparatus 100 according to any of the above embodiments, optionally, further comprises: and an air inlet of the induced draft fan 110 is connected with the outlet end of the dust remover 108 and is used for discharging the flue gas in the dust remover 108.
In this embodiment, the air inlet (air exhaust port) of the induced draft fan 110 extracts the flue gas from the dust collector 108, promotes the air circulation inside the dust collector 108 and the drying section 106, maintains the negative pressure environment in the drying section 106, guides the flow of the flue gas, and exhausts the treated flue gas.
The flue gas treatment apparatus 100 according to any of the above embodiments, optionally, further comprises: and an air inlet of the induced draft fan 110 is connected with the outlet end of the drying part 106 and is used for exhausting the flue gas in the drying part 106.
In this embodiment, for some application scenarios, because pollutant particles in the flue gas do not need to be treated, at this time, the induced draft fan 110 is directly communicated with the drying part 106, and the flue gas that has been burned (or dried) in the drying part 106 is directly discharged, so that airflow flowing in the drying part 106 is promoted, a negative pressure environment is formed, and the flue gas treatment efficiency is improved.
The flue gas treatment apparatus 100 according to any of the above embodiments, optionally, further comprises: a first frequency converter connected to the first fan 102 for controlling the operating frequency of the first fan 102, and/or a second frequency converter connected to the second fan for controlling the operating frequency of the second fan.
In this embodiment, the first fan 102 and the second fan may be controlled by a variable frequency control scheme, and the influence of uneven air volume distribution (air volume is blown to the combustion chamber in a concentrated manner) of the first fan 102 on the negative pressure environment of the combustion chamber is reduced as much as possible by the cooperative work of the first fan 102 and the second fan. The frequency conversion control mode is favorable for programming control, improves the running efficiency of the fan and optimizes the blowing effect.
According to the flue gas treatment equipment 100 of any of the above embodiments, optionally, the first fan 102 is a centrifugal fan, the second fan is an axial flow fan, and the drying part 106 is a drying drum.
In this embodiment, centrifugal fan is as the conveyor of flue gas mixture combustion-supporting gas, and the intake is big, helps promoting combustion efficiency, and axial fan promotes the flue gas and flows and cushions and disperse the gas mixture that centrifugal fan carried, reduces the negative pressure change that centrifugal fan directly blows the combustion chamber and brings, improves combustion efficiency.
Example two
As shown in fig. 2, there is a schematic block diagram of a flue gas treatment apparatus according to another embodiment of the present invention, which is applied in an operation environment for asphalt production, including: the environment-friendly type asphalt burner comprises an axial flow fan 202, a drying roller 204, a dust remover 206, an induced draft fan 208, a centrifugal fan 210, an asphalt flue gas pipeline 212, a tail gas flue 214, an environment-friendly burner 216 and a burner body 218, wherein the axial flow fan 202 is an integrated component of the burner body 218, and the centrifugal fan 210 and the burner body 218 form the environment-friendly burner 216, so that the combustion efficiency is improved. The control logic of the various components shown in fig. 2 is shown in fig. 3, fig. 3 being an electrical control block diagram of the flue gas treatment plant, comprising: the system comprises an upper computer 302, a PLC 304, an axial flow fan 202, an axial flow fan frequency converter 306, a centrifugal fan 210, a centrifugal fan frequency converter 308, an environment-friendly burner 216, a system induced draft fan 312 and an induced draft fan air door controller 314. In addition, the eco burner 216 further includes sensors such as an ignition valve and a purge valve.
In this embodiment, unlike the conventional scheme that the centrifugal fan is directly connected to the drying drum, the present application proposes that the centrifugal fan 210 is communicated with the burner body 218 through the asphalt flue gas pipeline 212, and the centrifugal fan 210 and the burner body 218 jointly form the eco-friendly burner 216 with higher combustion efficiency (better eco-friendly effect).
EXAMPLE III
As shown in fig. 4, which is a schematic flowchart of a control method according to an embodiment of the present invention, the control method is applied to a flue gas treatment device, the flue gas treatment device includes an axial flow fan and a centrifugal fan, and the control method includes: step S402, starting an axial flow fan to operate at a first frequency, and starting a centrifugal fan to operate at a second frequency; step S404, responding to an ignition instruction, controlling the axial flow fan to operate at a first frequency for a first time before an ignition action, reducing the first frequency to a third frequency of the axial flow fan after the first time, and reducing the second frequency to a fourth frequency of the centrifugal fan; step S406, executing an ignition action, and after the ignition is successful, increasing the operating frequency of the centrifugal fan to a fifth frequency after a second time period; step S408, in response to the fire stopping instruction, controlling the axial flow fan to operate at a sixth frequency for a third time period, and controlling the operating frequency of the axial flow fan to be reduced to a seventh frequency after the third time period; and step S410, closing the axial flow fan and the centrifugal fan.
In this embodiment, the axial fan is operated at the initial frequency (first frequency) during the startup phase of the process to purge the combustion chamber of the drying section for a first period of time (e.g., 30 seconds), during which the centrifugal fan is also operated at the initial frequency (second frequency) to fill the combustion chamber with combustible flue gas. After receiving an ignition instruction, the axial flow fan and the centrifugal fan both operate at a reduced speed to improve the ignition success rate until ignition is successful, the flame is stabilized by continuing delaying for a certain time (for example, 3 seconds for the second time), and after combustion is stabilized, the operating frequency of the centrifugal fan and the axial flow fan is improved, so that normal fire adding or fire reducing can be performed. After receiving the shut down command, the axial flow fan time delays purging the combustion chamber at a sixth frequency for a third period of time (e.g., 120 seconds), and then reduces the frequency to a seventh frequency until the centrifugal and axial flow fans are completely shut down (de-energized).
According to the control method of the above embodiment, optionally, the method further includes: and starting an induced draft fan to promote airflow to flow, wherein the induced draft fan is arranged at the downstream of the airflow flowing direction of the centrifugal fan and the axial flow fan.
In this embodiment, the action of starting the induced draft fan occurs before starting the axial flow fan and starting the centrifugal fan, and the induced draft fan is started first to accelerate the gas circulation in the flue gas treatment equipment, so as to form a negative pressure environment in the drying part and promote the flue gas circulation.
According to the control method of the above embodiment, optionally, the first frequency is equal to the sixth frequency, the second frequency is equal to the fifth frequency, and the third frequency is equal to the seventh frequency. Among them, the preferred frequencies are: the first frequency is 25Hz, the second frequency is 50Hz, the third frequency is 15Hz, the fourth frequency is 20Hz, the fifth frequency is 50Hz, the sixth frequency is 25Hz, and the seventh frequency is 15 Hz.
Example four
As shown in fig. 5, is a schematic flow chart of a control method according to still another embodiment of the present invention, including: starting an induced draft fan to promote airflow circulation; starting the axial flow fan, wherein the initial frequency is 25 Hz; starting a centrifugal fan, wherein the initial frequency is 50 Hz; after receiving an ignition instruction, purging the axial flow fan for 30 seconds; then the frequency of the axial flow fan is reduced to 15Hz, and the frequency of the centrifugal fan is synchronously reduced to 20 Hz; stabilizing flame for 3 seconds after ignition is successful; performing a fire addition or a fire reduction; after 3 seconds of flame stabilization, the frequency of the centrifugal fan can be increased to 50Hz and maintained within 10 seconds; after receiving a fire stopping command, the axial flow fan purges for 120 seconds at the running frequency of 25 Hz; after purging is finished, the frequency of the axial flow fan is reduced to 15 Hz; until the axial fan and the centrifugal fan are closed.
In this embodiment, the centrifugal fan for extracting the asphalt smoke is integrated with the axial flow fan of the original burner body, and as an environment-friendly burner, 2 fans are controlled by frequency conversion and work in cooperation, and the working process mainly comprises the following stages: (1) starting an induced draft fan, starting an axial flow fan and setting an initial frequency of 25Hz, and starting a centrifugal fan and setting an initial frequency of 50 Hz; (2) after an ignition instruction is obtained, the axial flow fan purges for 30s at 25HZ, then the ignition frequency is reduced to 15HZ, and the centrifugal fan is synchronously reduced to 20 HZ; (3) igniting and stabilizing flame for 3 seconds; (4) normal production is carried out by adding and reducing fire, and at the moment, the centrifugal fan is added to 50HZ within 10S and is kept; (5) after a flameout command is obtained, the axial flow fan purges 120S at the frequency of 25HZ, and then the frequency is reduced to 15 HZ; (6) and stopping the axial flow fan and the centrifugal fan. In the process, the asphalt smoke is introduced into the drying roller (burner) for burning through the centrifugal fan, so that the problem of asphalt smoke emission pollution is solved; the centrifugal fan and the original axial flow fan of the combustor are integrated, so that the total air quantity of the combustor is ensured, and the influence of negative pressure fluctuation on the combustor is avoided; 2 fans all adopt frequency conversion control, and cooperative work ensures that the amount of wind changes steadily.
EXAMPLE five
As shown in fig. 6, a control apparatus 600 according to an embodiment of the present invention includes: a memory 602, a processor 604 and a program stored on the memory 602 and executable on the processor 604, which when executed by the processor 604, implement the steps of the control method according to any of the embodiments described above. The control device 600 includes all the advantages of the control method according to any of the above embodiments, and will not be described herein again.
EXAMPLE six
As shown in fig. 7, an asphalt mixing plant 700 according to an embodiment of the present invention includes: an asphalt mixing device 702; and the flue gas treatment equipment 100 provided by any of the above technical solutions, wherein an air inlet of the first fan of the flue gas treatment equipment 100 is connected with a tail gas discharge port of the asphalt stirring equipment 702. Pollutants such as asphalt smoke, sulfur dioxide, nitrogen oxide, benzopyrene and the like are contained in a large amount of smoke generated in the working process of the asphalt stirring equipment, the smoke is conveyed to the combustor through the first fan to be combusted, and is further combusted or dried through the drying part, optionally, particles in the smoke are filtered through the dust remover subsequently, and finally the smoke is discharged through the draught fan, so that the finally discharged smoke meets the environmental protection requirement. In addition, the asphalt mixing plant 700 has all the advantages of the flue gas treatment device 100 provided by any of the above technical solutions, and details are not repeated herein.
EXAMPLE seven
As shown in fig. 8, according to an embodiment of the present invention, there is further provided a computer readable storage medium 800, on which a computer program 802 is stored, the computer program 802 implementing the control method defined in any of the above embodiments when executed.
In this embodiment, the computer program 802 when executed implements: starting the axial flow fan to operate at a first frequency, and starting the centrifugal fan to operate at a second frequency; responding to an ignition instruction, controlling the axial flow fan to operate at a first frequency for a first time before an ignition action, reducing the first frequency to a third frequency of the axial flow fan after the first time, and reducing the second frequency to a fourth frequency of the centrifugal fan; executing an ignition action, and after the ignition is successful, increasing the operating frequency of the centrifugal fan to a fifth frequency after a second time period; responding to a fire stopping instruction, controlling the axial flow fan to operate at a sixth frequency for a third time period, and controlling the operating frequency of the axial flow fan to be reduced to a seventh frequency after the third time period; and closing the axial flow fan and the centrifugal fan.
The computer program 802 according to the above technical solution optionally further includes: and starting an induced draft fan to promote airflow to flow, wherein the induced draft fan is arranged at the downstream of the airflow flowing direction of the centrifugal fan and the axial flow fan.
According to the computer program 802 of the above technical solution, optionally, the first frequency is equal to the sixth frequency, the second frequency is equal to the fifth frequency, and the third frequency is equal to the seventh frequency. Wherein, preferably: the first frequency is 25Hz, the second frequency is 50Hz, the third frequency is 15Hz, the fourth frequency is 20Hz, the fifth frequency is 50Hz, the sixth frequency is 25Hz, and the seventh frequency is 15 Hz.
According to the embodiment, the invention provides the flue gas treatment equipment, the control method, the control device, the storage medium and the asphalt mixing plant, asphalt flue gas can be introduced into the roller burner through the centrifugal fan, and the problem of asphalt flue gas emission pollution is solved; the centrifugal fan and the axial flow fan in the combustor are integrated, so that the total air quantity of the combustor is ensured, and the influence of negative pressure fluctuation on the combustor is avoided; the centrifugal fan and the axial flow fan are controlled by frequency conversion and work cooperatively, so that the stable air volume change is ensured. The flue gas treatment efficiency is improved.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable control device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable control device, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable control apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable control apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made therein without departing from the scope of the invention as defined in the appended claims and their equivalents, and it is intended that the invention encompass such changes and modifications as well.
Claims (10)
1. A flue gas treatment apparatus, comprising:
the air outlet of the first fan is communicated with the combustor, and the first fan conveys the flue gas to be treated to the combustion chamber of the drying part through the combustor;
the drying part is communicated with the combustor and is used for combusting the flue gas discharged by the combustor;
the combustor is internally provided with a second fan, and the first fan and the second fan work in a cooperative mode to adjust airflow so as to reduce disturbance of the first fan to the internal air pressure of the combustion chamber.
2. The flue gas treatment device according to claim 1, further comprising a dust remover, wherein the inlet end of the dust remover is connected with the outlet end of the drying part and is used for reducing the solid particle content in the flue gas; and/or the drying part is connected with the air inlet of the induced draft fan, and the air inlet of the induced draft fan is connected with the outlet end of the drying part and used for discharging the flue gas in the drying part.
3. The flue gas treatment apparatus of claim 2, further comprising:
and the air inlet of the draught fan is connected with the outlet end of the dust remover and used for discharging the smoke in the dust remover.
4. The flue gas treatment plant according to any one of claims 1 to 3, further comprising:
a first frequency converter connected to the first fan for controlling an operating frequency of the first fan, and/or,
and the second frequency converter is connected to the second fan and used for controlling the operating frequency of the second fan.
5. The flue gas treatment apparatus according to any one of claims 1 to 3, wherein the first fan is a centrifugal fan, the second fan is an axial fan, and the drying section is a drying drum.
6. A control method is suitable for a flue gas treatment device, the flue gas treatment device comprises an axial flow fan and a centrifugal fan, and the control method comprises the following steps:
starting the axial flow fan to operate at a first frequency, and starting the centrifugal fan to operate at a second frequency;
responding to an ignition instruction, controlling an axial flow fan to operate at a first frequency for a first time period before an ignition action, reducing the first frequency to a third frequency of the axial flow fan after the first time period, and reducing the second frequency to a fourth frequency of the centrifugal fan;
executing an ignition action, and after the ignition is successful, increasing the operating frequency of the centrifugal fan to a fifth frequency after a second time period;
responding to a fire stopping instruction, controlling the axial flow fan to operate at a sixth frequency for a third time, and controlling the operating frequency of the axial flow fan to be reduced to a seventh frequency after the third time;
and closing the axial flow fan and the centrifugal fan.
7. The control method according to claim 6, characterized by further comprising:
and starting an induced draft fan to promote airflow to flow, wherein the induced draft fan is arranged at the downstream of the airflow flowing direction of the centrifugal fan and the axial flow fan.
8. The control method according to claim 6 or 7, characterized in that the first frequency is equal to the sixth frequency, the second frequency is equal to the fifth frequency, and the third frequency is equal to the seventh frequency.
9. A control device, comprising: memory, a processor and a program stored on the memory and executable on the processor, the program being capable of implementing the steps defined by the control method of any one of claims 6 to 8 when executed by the processor.
10. An asphalt mixing plant, comprising:
asphalt mixing equipment;
the flue gas treatment equipment of any one of claims 1 to 5, wherein the air inlet of the first fan of the flue gas treatment equipment is connected with the tail gas discharge port of the asphalt mixing equipment.
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| CN201910886220.1A CN110686257A (en) | 2019-09-19 | 2019-09-19 | Flue gas treatment equipment, control method, control device and asphalt mixing plant |
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| CN201910886220.1A CN110686257A (en) | 2019-09-19 | 2019-09-19 | Flue gas treatment equipment, control method, control device and asphalt mixing plant |
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