CN112066409A - Axial flow primary fan set and parallel method thereof - Google Patents
Axial flow primary fan set and parallel method thereof Download PDFInfo
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- CN112066409A CN112066409A CN202010825090.3A CN202010825090A CN112066409A CN 112066409 A CN112066409 A CN 112066409A CN 202010825090 A CN202010825090 A CN 202010825090A CN 112066409 A CN112066409 A CN 112066409A
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- primary air
- fan
- air
- cold
- main pipe
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L1/00—Passages or apertures for delivering primary air for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L3/00—Arrangements of valves or dampers before the fire
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L5/00—Blast-producing apparatus before the fire
- F23L5/02—Arrangements of fans or blowers
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
Abstract
The invention discloses an axial flow primary fan set and a parallel method thereof, wherein the parallel method comprises the following steps: disconnecting the combined primary air fan and the cold primary air main pipe; keeping the output of the primary air fan to be constant, and closing at least one part of a primary air cooling door of the primary air fan to reduce the air pressure of the primary air cooling main pipe; starting the combined primary air blower; and under the condition that the air pressure of the air outlet of the combined primary air fan is greater than that of the cold primary air main pipe, the combined primary air fan is communicated with the cold primary air main pipe. In the process of paralleling the operating primary air fan and the parallel primary air fans by adopting the paralleling method, the air pressure of the hot primary air main pipe cannot be reduced, the insufficient ventilation output of the coal mill can be prevented, and the safe operation of the unit is ensured.
Description
Technical Field
The invention relates to the technical field of axial flow primary fans, in particular to an axial flow primary fan set and a parallel method thereof.
Background
In consideration of safe operation, at least two axial flow primary fans are generally adopted to operate in parallel. At present, the purpose of reducing the air pressure of a cold primary air main pipe is generally achieved by reducing the output force of an axial flow primary air fan in an operating state, so as to provide a prerequisite for the successful incorporation of the combined primary air fan. However, when two axial flow primary fans are arranged in parallel by adopting the method, the air pressure of the hot primary air main pipe is reduced, so that the ventilation output of the coal mill communicated with the hot primary air main pipe is insufficient, and the safe operation of the unit is influenced.
Disclosure of Invention
The invention discloses an axial flow primary fan unit and a parallel method thereof, and aims to solve the problem that the safe operation of a unit is influenced due to insufficient ventilation output of a coal mill caused by the reduction of air pressure of a hot primary air main pipe in the process of parallel axial flow primary fans at present.
In order to solve the problems, the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a parallel method, applied to parallel work of a primary operating fan and a secondary combined fan in an axial flow primary fan set, where the primary operating fan is provided with an air outlet, and a primary cold air branch and a primary hot air branch both communicated with the air outlet, the primary hot air branch is communicated with a primary hot air main pipe, the primary cold air branch is communicated with a primary cold air main pipe, the primary cold air branch is provided with a primary cold air door, and the secondary combined fan is communicated with the primary cold air main pipe through its own air outlet, where the parallel method includes:
disconnecting the combined primary air fan and the cold primary air main pipe;
keeping the output of the primary air fan to be constant, and closing at least one part of a primary air cooling door of the primary air fan to reduce the air pressure of the primary air cooling main pipe;
starting the combined primary air blower;
and under the condition that the air pressure of the air outlet of the combined primary air fan is greater than that of the cold primary air main pipe, the combined primary air fan is communicated with the cold primary air main pipe.
In a second aspect, an embodiment of the present invention further provides an axial flow primary fan unit, which includes a primary operation fan, a secondary operation fan, a primary hot main pipe and a primary cold air main pipe, wherein the primary operation fan and the secondary operation fan are arranged in parallel by using the above parallel method, the primary operation fan is provided with an air outlet, and a primary cold air branch and a primary hot air branch both communicated with the air outlet, the primary hot air branch is communicated with the primary hot air main pipe, the primary cold air branch is communicated with the primary cold air main pipe, the primary cold air branch is provided with a primary cold air door, and the secondary operation fan is communicated with the primary cold air main pipe through its own air outlet.
The technical scheme adopted by the invention can achieve the following beneficial effects:
the parallel method disclosed by the invention comprises the steps of firstly disconnecting the primary air driven machine and the primary air cooling main pipe to isolate the primary air driven machine and the primary air driven machine from each other, secondly keeping the output of the primary air driven machine to be operated unchanged, and achieving the purpose of reducing the air pressure of the primary air cooling main pipe in a mode of closing at least one part of a primary air cooling door of the primary air driven machine to be operated, under the condition, starting the primary air driven machine, wherein the primary air driven machine and the primary air cooling main pipe are disconnected from each other, the air pressure at the air outlet of the primary air driven machine is continuously increased along with the starting and working process of the primary air driven machine, and the air pressure in the primary air cooling main pipe is reduced, so that after the primary air driven machine works for a period of time, the air pressure at the air outlet of the primary air driven machine is ensured to be larger than the air pressure of the primary air cooling main pipe, and the condition that the primary air driven machine is successfully merged into the primary air driven machine at the moment is, under the condition, the combined primary air fan and the cold primary air main pipe are communicated, and the parallel work of the combined primary air fan and the running primary air fan can be successfully completed. Obviously, when the parallel method is adopted to parallel the running primary air fan and the combined primary air fan, the condition of air pressure reduction of the hot primary air main pipe can not occur because the output of the running primary air fan is unchanged, so that the condition of insufficient ventilation output of a coal mill communicated with the hot primary air main pipe can be prevented, and the safe running of a unit can be ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a parallel method disclosed in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an axial flow primary fan unit disclosed in the embodiment of the present invention.
Description of reference numerals:
100-operation of the primary fan,
200-a primary fan of the quilt,
300-cold primary air main pipe,
400-hot primary air main pipe,
500-air outlet,
600-cooling a primary air door,
700-hot primary air door,
800-air preheater.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical solutions disclosed in the embodiments of the present invention are described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the embodiment of the present invention discloses a parallel method, which can be applied to parallel operation of a primary operating fan and a primary combined fan in an axial flow primary fan set, where the primary operating fan and the primary combined fan are both axial flow primary fans. Wherein, operation primary air fan is equipped with air outlet, cold primary air branch road and hot primary air branch road, and cold primary air branch road and hot primary air branch road all communicate with the air outlet of operation primary air fan, and the hot primary air branch road and the female pipe intercommunication of hot primary air of operation primary air fan, the cold primary air branch road and the female pipe intercommunication of cold primary air of operation primary air fan, and the cold primary air branch road is equipped with cold primary air door. The combined primary air fan is communicated with the cold primary air main pipe through an air outlet of the combined primary air fan. In addition, the hot primary air main pipe is also communicated with equipment such as a coal mill and the like, so that gas in the hot primary air is sent into the coal mill, and pulverized coal in the coal mill is dried. Furthermore, the cold primary air main pipe can also be communicated with the inlet end of the coal mill so as to be mixed with the gas output by the hot primary air main pipe, and the purpose of adjusting the temperature of the gas input into the coal mill is achieved.
In the process of operating the primary air fan and the secondary air fan in parallel, the primary air fan is in a normal operation state, and the secondary air fan is in a shutdown state. The parallel method disclosed by the embodiment of the invention comprises the following steps:
s1, disconnecting the combined primary air fan and the cold primary air main pipe; optionally, the combined primary air fan and the cold primary air main pipe can be disconnected with each other by closing a baffle or a switch and other structures arranged between the air outlet of the combined primary air fan and the cold primary air main pipe, the combined primary air fan and the combined primary air fan are isolated from each other, and gas generated by the combined primary air fan cannot flow back to the combined primary air fan.
Under the condition that the combined primary air fan is communicated with the running primary air fan only through the cold primary main pipe, optionally, the combined primary air fan and the cold primary air main pipe are disconnected by closing an air outlet of the combined primary air fan, and the implementation mode is simple and convenient and is easy to operate.
And S2, keeping the output of the primary air fan to be constant, and closing at least one part of the primary air door of the primary air fan to reduce the air pressure of the primary air main pipe. In the process, the output of the primary air fan is kept unchanged, the air pressure of the primary air main pipe communicated with the primary air branch of the primary air fan can be prevented from being reduced, the situation that the ventilation output is insufficient of the coal mill communicated with the primary air main pipe can be prevented, and the unit can be ensured to run safely. Alternatively, during the closing of the cold primary damper, the flow rate of the cold primary damper may be reduced to a different value, such as 75% or 50% or 25% of the maximum value, or may be reduced to 0, depending on the actual situation.
S3, starting a primary fan; because the combined primary air fan and the primary cold air main pipe are in a disconnected state, after the combined primary air fan is started, along with the continuous work of the combined primary air fan, the air pressure between the combined primary air fan and the primary cold air main pipe can be continuously increased, and because the air pressure in the primary cold air main pipe is reduced, after the combined primary air fan works for a period of time, the air pressure at the combined primary air fan can be ensured to be greater than the air pressure in the primary cold air main pipe, and the condition that the combined primary air fan is successfully merged at the moment is considered to be met.
Specifically, the air pressure detection devices such as barometers or air pressure sensors may be built in or out of the air outlet of the primary air-cooled fan and the primary air-cooled main pipe to obtain the air pressure values at the air outlet of the primary air-cooled fan and in the primary air-cooled main pipe. Or, the primary air fan can be operated in a mode of completely closing the primary air cooling door of the primary air fan, so that the primary air fan does not convey air to the primary air cooling main pipe any more.
And S4, communicating the combined primary air fan and the cold primary air main pipe under the condition that the air pressure of the air outlet of the combined primary air fan is larger than that of the cold primary air main pipe. As described above, when the above conditions are satisfied, the parallel operation of the combined primary air fan and the operating primary air fan can be successfully completed by communicating the combined primary air fan and the cold primary air main pipe with each other. Specifically, by opening the baffle or the switch and other structures arranged between the air outlet of the combined primary air fan and the primary air cooling main pipe, the combined primary air fan can be communicated to the primary air cooling main pipe, and the gas output by the combined primary air fan can be stably conveyed into the primary air cooling main pipe. In addition, the opening degree of the movable blades of the primary fan to be merged is not higher than that of the movable blades of the primary fan to operate, or the frequency converter frequency of the primary fan to be merged is not higher than that of the primary fan to operate.
As above, under the condition that the combined primary air fan is communicated with the primary air fan only through the primary air cooling main pipe, and under the condition that the air pressure of the air outlet of the combined primary air fan is greater than that of the primary air cooling main pipe, the purpose of communicating the combined primary air fan and the primary air cooling main pipe can be realized by opening the air outlet of the combined primary air fan.
Optionally, the combined primary air fan is also provided with a cold primary air branch and a hot primary air branch, the cold primary air branch and the hot primary air branch are both communicated with an air outlet of the combined primary air fan, the combined primary air fan is communicated with the cold primary air main pipe through the cold primary air branch, and the combined primary air fan is communicated with the hot primary air main pipe through the hot primary air branch, so that after the combined primary air fan and the running primary air fan are successfully completed in parallel, the flow of gas in the cold primary air main pipe and the hot primary air main pipe can be simultaneously increased, and the normal work of the hot primary air main pipe and the cold primary air main pipe can be ensured under the condition that the combined primary air fan or the running primary air fan breaks down and stops.
Based on the above situation, in order to ensure that the primary air blower and the secondary air blower can still complete parallel work, the step S1 is specifically:
and S11, closing an air outlet of the combined primary air fan and a hot primary air door of the combined primary air fan to disconnect the combined primary air fan and the cold primary air main pipe. Under the condition of adopting above-mentioned scheme, through closing the air outlet that all communicates with air door once of hot air door and cold, can realize the disconnection by the purpose of the female pipe of primary air fan and cold air, and through the mode of closing the air door once of hot, can prevent to send into the gas in the female pipe of hot primary air from by the female pipe of hot primary air branch road and the female pipe of cold air branch road inflow of primary air fan because of operation primary air fan, and produce adverse effect to the normal work of unit. And moreover, under the condition that the hot primary air door of the combined primary air fan is in a closed state, the situation that the air pressure of the hot primary air main pipe is larger than that of the combined primary air fan in the subsequent parallel process can be prevented, and the parallel failure of the primary air fans is caused.
Under the condition of adopting the technical scheme, the step S4 specifically includes:
and S41, under the condition that the air pressure of the air outlet of the combined primary air fan is larger than that of the cold primary air main pipe, opening the air outlet of the combined primary air fan to communicate the combined primary air fan and the cold primary air main pipe. As above, by separately opening the outlet of the combined primary air blower, the combined primary air blower and the primary cold air main pipe can be communicated with each other, and the combined primary air blower and the primary hot air main pipe can still be kept in a disconnected state.
In the case that the combined primary air fan is communicated with the cold primary air main pipe through the cold primary air branch and is communicated with the hot primary air main pipe through the hot primary air branch, optionally, the step S1 may further specifically be:
and S12, closing the cold primary air door of the combined primary air fan and the hot primary air door of the combined primary air fan to disconnect the combined primary air fan and the cold primary air main pipe. Under the condition of adopting above-mentioned scheme, through closing the cold primary air door of the quilt and primary air fan, also can realize the purpose of disconnection quilt and primary air fan and cold primary air mother pipe, and under the condition that the hot primary air door of quilt and primary air fan is in the closed condition, can prevent that follow-up parallel in-process from appearing the condition that the atmospheric pressure of the mother pipe of hot primary air is greater than the atmospheric pressure of quilt and primary air fan, lead to the parallel failure of primary air fan.
Under the condition of adopting the technical scheme, the step S4 specifically includes:
and S42, under the condition that the air pressure of the air outlet of the combined primary air fan is larger than that of the primary air cooling main pipe, opening a primary air cooling door of the combined primary air fan to communicate the combined primary air fan and the primary air cooling main pipe. As described above, the combined primary air fan and the primary cold air main pipe can be communicated with each other by independently opening the primary cold air door of the combined primary air fan, and the combined primary air fan and the primary hot air main pipe can still be kept in a disconnected state.
In the case that the combined primary air fan is communicated with the cold primary air main pipe through the cold primary air branch and is communicated with the hot primary air main pipe through the hot primary air branch, optionally, the step S1 may further specifically be:
and S13, closing an air outlet of the combined primary air fan, a cold primary air door of the combined primary air fan and a hot primary air door of the combined primary air fan to disconnect the combined primary air fan and the cold primary air main pipe. Under the condition that the air outlet of the combined primary air fan, the cold primary air door of the combined primary air fan and the hot primary air door of the combined primary air fan are all in a closed state, the success rate and the safety performance of parallel work of the combined primary air fan and the running primary air fan can be further improved.
Further, the step S4 may specifically be:
and S43, under the condition that the air pressure of the air outlet of the combined primary air fan is larger than that of the cold primary air main pipe, opening the air outlet of the combined primary air fan and the cold primary air door of the combined primary air fan to communicate the combined primary air fan and the cold primary air main pipe.
Based on the above, the respective opening and closing manners of the air outlet of the combined primary air fan, the hot primary air door of the combined primary air fan and the cold primary air door of the combined primary air fan have been described in detail, and in consideration of the brevity of the text, the description will not be repeated here.
In the case that the combined primary air fan is communicated with the cold primary air main pipe through the cold primary air branch and is communicated with the hot primary air main pipe through the hot primary air branch, the step S4 may further include:
and S5, a hot primary air branch and a hot primary air main pipe which are communicated with the combined primary air fan. Specifically, the hot primary air branch of the combined primary air fan and the hot primary air main pipe can be communicated with each other by opening the hot primary air door, and under the condition, the flow of gas in the hot primary air main pipe can be increased, so that the performance of the unit is improved.
Of course, in order to further improve the safety performance and the parallel success rate, the step S5 may be performed after the parallel primary air blower and the operating primary air blower are confirmed to have successfully completed the parallel operation and the unit operates stably.
Optionally, the combined primary air fan can be communicated with the operation primary air fan through a communication door, so that after the work that the combined primary air fan is parallel to the operation primary air fan is completed, the air circulation can be performed between the operation primary air fan and the combined primary air fan, and the respective air pressure in the working process of the operation primary air fan and the combined primary air fan is balanced.
In the case that the axial flow primary fan unit adopts the above structure, the parallel method disclosed in the embodiment of the present invention further includes, before step S3:
s6, closing the connection door to disconnect the primary running fan and the secondary combined fan, so that gas generated by the primary running fan is prevented from flowing into the secondary combined fan through the connection door, the secondary combined fan has a backflow phenomenon, and the starting difficulty of the secondary combined fan can be reduced.
Optionally, the step S2 may specifically be:
s21, keeping the output of the primary air fan unchanged, and closing a primary air cooling door of the primary air fan to reduce the air pressure value of a primary air cooling main pipe to 0, so that the primary air cooling branch of the primary air fan does not convey air to the primary air cooling main pipe any more, and after a period of time, the air pressure value of the primary air cooling main pipe can be reduced to 0. Certainly, the cold primary air branch of the primary air fan can be disconnected with the cold primary air main pipe in other modes, and the method is not exemplified here in consideration of concise text. Wherein, closing the cold primary air door of the primary air fan means that the flow area between the air outlet of the primary air fan and the cold primary air main pipe reaches the minimum value, and the minimum value can be 0.
Under the condition that the air pressure value of the primary air cooling main pipe is 0, the air pressure at the air outlet of the primary air fan can be more easily made to be larger than the air pressure in the primary air cooling main pipe, the difference value between the air pressure at the air outlet of the primary air fan and the air pressure in the primary air cooling main pipe can be made to be larger, and the parallel success rate of the primary air fan and the running primary air fan and the safety performance in the parallel process can be favorably improved.
Optionally, after step S4, the parallel method disclosed in the embodiment of the present invention may further include:
and S7, opening a cold primary air door of the primary air fan so that the gas generated by the primary air fan can be still conveyed into the cold primary air main pipe through the cold primary air branch pipe to increase the flow of the gas in the cold primary air main pipe. Similarly, in order to further improve the safety performance and the parallel success rate, the step S7 may be performed after the parallel primary air blower and the operating primary air blower are confirmed to have successfully completed the parallel operation and the unit operates stably.
Optionally, the step S4 may specifically be:
and S44, communicating the combined primary air fan and the cold primary air main pipe when the air pressure of the air outlet of the combined primary air fan is more than 2kpa higher than that of the cold primary air main pipe.
As above, can be at the air outlet department of the primary air fan and the female pipe of cold primary air in and set up atmospheric pressure check out test set, with carrying out the in-process of working side by side, real-time supervision is by the air outlet department of primary air fan and the female pipe of cold primary air respective atmospheric pressure, and then the atmospheric pressure of the air outlet of the primary air fan that is being combined is greater than the atmospheric pressure of the female pipe of cold primary air and exceeds 2kpa, namely under the circumstances that the atmospheric pressure difference between primary air fan and the female pipe of cold primary air is greater than 2kpa, communicate again by the primary air fan and the female pipe of cold primary air, reach the purpose that promotes and to be connected success rate and security performance side by side.
Based on the parallel method disclosed in the above embodiment, as shown in fig. 2, the embodiment of the present invention further discloses an axial flow primary fan set, which includes 100, a combined primary fan 200, a cold primary air main 300, and a hot primary air main 400, wherein the operating primary fan 100 and the combined primary fan 200 may be parallel by using the parallel method disclosed in any of the above embodiments. The operation primary air fan 100 is provided with an air outlet 500, and is communicated with a cold primary air branch and a hot primary air branch with the air outlet 500, the hot primary air branch is communicated with a hot primary air main pipe, the cold primary air branch is communicated with a cold primary air main pipe, the cold primary air branch is provided with a cold primary air door 600, and the primary air fan 200 is communicated with the cold primary air main pipe 300 through the air outlet 500 of the primary air fan. In addition, the hot primary air branch of the primary air fan 100 may be further provided with a hot primary air door 700.
In the axial-flow primary fan unit disclosed in other embodiments of the present invention, the merged primary fan 200 is also provided with a cold primary air branch and a hot primary air branch which are communicated with the air outlet 500 thereof, the cold primary air branch of the merged primary fan 200 is communicated with the cold primary air header 300, the cold primary air branch is provided with the cold primary air door 600, the hot primary air branch of the merged primary fan is communicated with the hot primary air header 400, and the hot primary air branch is provided with the hot primary air door 700.
The respective hot primary air branches of the operational primary air fan 100 and the combined primary air fan 200 may be provided with an air preheater 800 to heat the gas flowing through the hot primary air branches by the air preheater 800.
Optionally, an air pressure detection device may be installed in the air outlet 500 of the combined primary air fan and the cold primary air main pipe 300, and of course, an air pressure detection device may also be installed at other positions in the axial flow primary air fan set. In addition, the operating primary air fan 100 and the combined primary air fan 200 can be communicated through a communication door, and the communication door can be arranged at the upstream of the cold primary air branch and the hot primary air branch.
In the above embodiments of the present invention, the difference between the embodiments is mainly described, and different optimization features between the embodiments can be combined to form a better embodiment as long as they are not contradictory, and further description is omitted here in view of brevity of the text.
The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A parallel method is applied to parallel work of a running primary air fan and a combined primary air fan in an axial flow primary air fan set, wherein the running primary air fan is provided with an air outlet, a cold primary air branch and a hot primary air branch which are communicated with the air outlet, the hot primary air branch is communicated with a hot primary air main pipe, the cold primary air branch is communicated with a cold primary air main pipe, the cold primary air branch is provided with a cold primary air door, and the combined primary air fan is communicated with the cold primary air main pipe through the air outlet of the combined primary air fan, and is characterized by comprising the following steps:
disconnecting the combined primary air fan and the cold primary air main pipe;
keeping the output of the primary air fan to be constant, and closing at least one part of a primary air cooling door of the primary air fan to reduce the air pressure of the primary air cooling main pipe;
starting the combined primary air blower;
and under the condition that the air pressure of the air outlet of the combined primary air fan is greater than that of the cold primary air main pipe, the combined primary air fan is communicated with the cold primary air main pipe.
2. The parallel method according to claim 1, wherein the disconnecting the combined primary air fan and the cold primary air main pipe is specifically:
closing an air outlet of the combined primary air fan to disconnect the combined primary air fan and the cold primary air main pipe;
under the condition that the air pressure of the air outlet of the combined primary air fan is greater than the air pressure of the cold primary air main pipe, the combined primary air fan and the cold primary air main pipe are communicated, and the method specifically comprises the following steps:
and under the condition that the air pressure of the air outlet of the combined primary air fan is greater than that of the primary air cooling main pipe, opening the air outlet of the combined primary air fan to communicate the combined primary air fan and the primary air cooling main pipe.
3. The parallel method according to claim 2, wherein the merged primary air machine comprises a hot primary air branch and a cold primary air branch, the hot primary air branch of the merged primary air machine and the cold primary air branch of the merged primary air machine are both communicated with an air outlet of the merged primary air machine, the hot primary air branch of the merged primary air machine is communicated with the hot primary air main pipe, the hot primary air branch is provided with a hot primary air door, the cold primary air branch of the merged primary air machine is communicated with the cold primary air main pipe, the cold primary air branch is provided with a cold primary air door, and the disconnecting of the merged primary air machine and the cold primary air main pipe is specifically:
closing an air outlet of the combined primary air fan and a hot primary air door of the combined primary air fan to disconnect the combined primary air fan and the cold primary air main pipe;
under the condition that the air pressure of the air outlet of the combined primary air fan is greater than the air pressure of the cold primary air main pipe, the combined primary air fan and the cold primary air main pipe are communicated, and the method specifically comprises the following steps:
and under the condition that the air pressure of the air outlet of the combined primary air fan is greater than that of the primary air cooling main pipe, opening the air outlet of the combined primary air fan to communicate the combined primary air fan and the primary air cooling main pipe.
4. The parallel method according to claim 2, wherein the merged primary air machine comprises a hot primary air branch and a cold primary air branch, the hot primary air branch of the merged primary air machine and the cold primary air branch of the merged primary air machine are both communicated with an air outlet of the merged primary air machine, the hot primary air branch of the merged primary air machine is communicated with the hot primary air main pipe, the hot primary air branch is provided with a hot primary air door, the cold primary air branch of the merged primary air machine is communicated with the cold primary air main pipe, the cold primary air branch is provided with a cold primary air door, and the disconnecting of the merged primary air machine and the cold primary air main pipe is specifically:
closing a cold primary air door of the combined primary air fan and a hot primary air door of the combined primary air fan to disconnect the combined primary air fan and the cold primary air main pipe;
under the condition that the air pressure of the air outlet of the combined primary air fan is greater than the air pressure of the cold primary air main pipe, the combined primary air fan and the cold primary air main pipe are communicated, and the method specifically comprises the following steps:
and under the condition that the air pressure of the air outlet of the combined primary air fan is greater than that of the primary air cooling main pipe, opening a primary air cooling door of the combined primary air fan to communicate the combined primary air fan and the primary air cooling main pipe.
5. The parallel method according to claim 3 or 4, wherein, when the air pressure at the air outlet of the merged primary air blower is greater than the air pressure of the cold primary air main pipe, the method further comprises the following steps of communicating the merged primary air blower with the cold primary air main pipe:
and the hot primary air branch and the hot primary air main pipe are communicated with the combined primary air fan.
6. The parallel method of claim 1, wherein the merged primary fan is further in communication with the operating primary fan through a communication door, and wherein the activating the merged primary fan further comprises:
closing the communication door to disconnect the operating primary air fan and the combined primary air fan.
7. The parallel method according to claim 1, wherein the keeping of the output of the primary air fan is performed by closing at least a portion of a cold primary damper of the primary air fan to reduce the air pressure of the cold primary air main pipe by:
keeping the output of the primary air fan to be constant, and closing a primary air cooling door of the primary air fan to reduce the air pressure value of the primary air cooling main pipe to 0.
8. The parallel method as claimed in claim 1, wherein, when the air pressure at the air outlet of the merged primary air blower is greater than the air pressure of the cold primary air main, the method further comprises the following steps:
and opening a cold primary air door of the operating primary air fan.
9. The parallel method according to claim 1, wherein when the air pressure at the air outlet of the merged primary air blower is greater than the air pressure of the cold primary air main pipe, the communicating between the merged primary air blower and the cold primary air main pipe is specifically:
and under the condition that the air pressure of the air outlet of the combined primary air fan is more than 2kpa higher than that of the cold primary air main pipe, the combined primary air fan is communicated with the cold primary air main pipe.
10. An axial flow primary fan set, characterized in that, comprising a running primary fan, a combined primary fan, a hot primary main pipe and a cold primary air main pipe, wherein the running primary fan and the combined primary fan are juxtaposed by the juxtaposing method of any one of claims 1 to 9, the running primary fan is provided with an air outlet, and a cold primary air branch and a hot primary air branch both communicated with the air outlet, the hot primary air branch is communicated with the hot primary air main pipe, the cold primary air branch is communicated with the cold primary air main pipe, the cold primary air branch is provided with a cold primary air door, and the combined primary fan is communicated with the cold primary air main pipe through the air outlet of the combined primary fan.
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| CN202010825090.3A CN112066409A (en) | 2020-08-17 | 2020-08-17 | Axial flow primary fan set and parallel method thereof |
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| CN202010825090.3A CN112066409A (en) | 2020-08-17 | 2020-08-17 | Axial flow primary fan set and parallel method thereof |
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