CN108910541B - Energy-saving ash conveying system and method for power plant - Google Patents
Energy-saving ash conveying system and method for power plant Download PDFInfo
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- CN108910541B CN108910541B CN201810864564.8A CN201810864564A CN108910541B CN 108910541 B CN108910541 B CN 108910541B CN 201810864564 A CN201810864564 A CN 201810864564A CN 108910541 B CN108910541 B CN 108910541B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/66—Use of indicator or control devices, e.g. for controlling gas pressure, for controlling proportions of material and gas, for indicating or preventing jamming of material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/04—Conveying materials in bulk pneumatically through pipes or tubes; Air slides
- B65G53/16—Gas pressure systems operating with fluidisation of the materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/36—Arrangements of containers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/40—Feeding or discharging devices
- B65G53/46—Gates or sluices, e.g. rotary wheels
Abstract
The invention discloses an energy-saving ash conveying system and method for a power plant, belongs to the technical field of material conveying, and aims to solve the problem of resource waste caused by the existing pneumatic ash conveying system. The technical scheme is characterized in that each machine set is correspondingly connected to each ash bucket and used for conveying dry ash to an ash warehouse. The controller is connected with each unit and is used for controlling the operation of each unit. When the number of the units in operation is not less than the set number, the controller controls other units to suspend working and carry out sequential queuing. When the number of the units in operation is less than the set number, the controller controls the units in front of the queue to convey ash, and the method has the advantage of being beneficial to saving resources.
Description
Technical Field
The invention relates to the technical field of material conveying, in particular to an energy-saving ash conveying system and method for a power plant.
Background
The dry ash generated by the power plant is usually discharged from an ash hopper of the dust remover to a bin pump, and then the dry ash is conveyed to an ash storage by the bin pump. The operation flow of the bin pump ash conveying is as follows: feeding, waiting for air, air inlet, conveying, purging, waiting and next circulation, wherein the time length of the conveying process is determined by the pressure in the conveying pipe, and when the pressure in the conveying pipe is less than a certain set value, the condition that no ash exists in the pipe is judged, and the conveying is finished. All bin pumps are automatically circulated, and the conveying time is not fixed.
The prior Chinese patent with publication number CN103241550A discloses a pneumatic ash conveying system, which comprises an ash removing hopper, a bin pump, an ash bin, an air storage tank and a fan, wherein an ash outlet of the ash removing hopper is communicated with an inlet of the bin pump through a pipeline, an ash outlet of the bin pump is communicated with an inlet of the ash bin through a pipeline, an air outlet pipe of the air storage tank is divided into two paths at an air outlet, the first path is communicated with the pipeline between the ash removing hopper and the bin pump, the second path is communicated with the pipeline between the bin pump and the ash bin, and an air outlet of the fan is communicated with the pipeline between the bin pump and the ash bin through an air conveying pipe.
However, because the conveying time of the bin pumps is not fixed, when the bin pumps operate, the phenomenon that four, five or even more bin pumps convey ash can occur at the same time, and the demand for compressed air is large; there is also the phenomenon that there is no silo pump or only one silo pump is conveying ash, resulting in an excess of compressed air. Both cases bring resource waste, and the problem is to be solved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an energy-saving ash conveying system for a power plant, which has the advantage of being beneficial to saving resources.
In order to achieve the purpose, the invention provides the following technical scheme:
an energy-saving ash conveying system of a power plant comprises a plurality of ash hoppers corresponding to dust collectors and an ash warehouse for storing dry ash; the energy-saving ash conveying system comprises:
the units are correspondingly connected with the ash hoppers and used for conveying dry ash to the ash storehouse; the controller is connected with each unit and used for controlling the operation of each unit;
the controller is used for controlling other units to pause and queue in sequence when the number of the units in operation is not less than a set number; and the controller is also used for controlling the ash conveying of the unit with the front queue when the number of the running units is less than a set number.
Through adopting above-mentioned technical scheme, each unit corresponds and connects in each ash bucket for carry the dry ash to the ash storehouse. The controller is connected with each unit and is used for controlling the operation of each unit. When the number of the units which are conveying ash is not less than the set number, the controller controls other units to suspend working and carry out sequential queuing. When the number of the units which are running is smaller than the set number, the controller controls the units which are queued at the front to convey ash. The intelligent control of each unit is realized, the stability of the number of the units in operation is ensured, and the resource saving is facilitated.
Further, the controller comprises a register for recording the number of the running units and a comparison module for storing the set number of the maximum unit allowed to run, wherein the comparison module is used for comparing the number of the running units recorded in the register with the set number stored in the comparison module.
By adopting the technical scheme, the controller is internally defined with the switch variable coil a and the allowable unit conveying coil b, when the unit conveys ash, the controller can set the coil a as a mark, and when the unit conveys ash, the controller can reset the coil a. And the controller judges each unit, accumulates the rising edges of the coils a and subtracts the falling edges of the coils a, so that the number of the units which are conveying ash at the moment is obtained and stored in the register. And comparing the numerical value in the register with a set value of the maximum unit number allowed to operate, and outputting an allowed unit conveying coil b if the numerical value is smaller than the set value, so that the controller controls the unit in front of the queue to operate, and the method has the effects of conveniently judging the number of the units currently operating and conveniently controlling the operation state of the units.
Further, the unit comprises a bin pump, a feed valve, a balance valve, a discharge valve, a first air compressor, a second air compressor, a primary air valve and a tertiary air valve, wherein the feed valve, the balance valve, the discharge valve, the first air compressor, the second air compressor, the primary air valve and the tertiary air valve are connected with the controller; a feeding pipeline is connected between the bin pump and the ash bucket, and a conveying pipe is connected between the bin pump and the ash bin; the feed valve is arranged on the feed pipeline, the discharge valve is arranged on the conveying pipe, and the balance valve is arranged on the bin pump; a first air inlet pipe is connected between the first air compressor and the bin pump, and a second air inlet pipe is connected between the second air compressor and the bin pump; the primary air valve is arranged on the first air inlet pipe, and the tertiary air valve is arranged on the second air inlet pipe.
By adopting the technical scheme, a setting feeding ending coil c is further defined in the controller, and the controller starts to feed into the bin pump from the ash bucket after controlling the feeding valve and the balance valve to be opened. In the feeding process, when the feeding valve is closed, the feeding is judged to be finished, and the controller sets the feeding finishing coil c. When the coil b and the coil c are closed simultaneously, the controller controls the primary air valve, the tertiary air valve and the discharge valve to be opened in sequence to discharge materials, and resets the coil c, so that the operation state of each unit can be controlled conveniently.
Further, the controller comprises a timing module and a detection module, and a pressure sensor which is connected with the controller and used for detecting the pressure of the conveying pipe is arranged on the conveying pipe; the detection module is used for operating the timing module to start timing when the pressure value detected by the pressure sensor is smaller than a preset set value; the detection module is also used for controlling the corresponding bin pump to suspend ash conveying after the timing module counts the preset time length.
Through adopting above-mentioned technical scheme, in the timing time quantum of timing module, gas valve, cubic gas valve and bleeder valve all keep the open mode to can sweep away the remaining dry ash in storehouse pump and the conveyer pipe, prevent the interior deposition of storehouse pump and conveyer pipe. After timing is finished, the controller can control the primary air valve, the tertiary air valve and the discharge valve to be closed, and therefore the current unit which completes one working cycle can enter the next working cycle.
Further, the controller is connected with an alarm, and the detection module is further used for controlling the alarm to send out an alarm signal when the pressure value detected by the pressure sensor is greater than a preset pressure threshold value.
Through adopting above-mentioned technical scheme, the alarm is reported to the police too big in order to remind the pressure on the operator conveyer pipe to make the operator in time handle this abnormal conditions, avoid system's trouble or harm.
Another object of the present invention is to provide an energy-saving ash conveying method for a power plant based on the above energy-saving ash conveying system for a power plant, which has the advantage of being beneficial to saving resources.
The power plant energy-saving ash conveying method based on the power plant energy-saving ash conveying system is characterized in that each bin pump conveys one group of dry ash to form a working cycle, and each working cycle comprises the following stages:
in the feeding stage, the controller controls the balance valve and the feeding valve to be opened; when the opening time of the balance valve and the feeding valve reaches the preset opening time, the controller controls the balance valve and the feeding valve to be closed, the feeding stage is ended, and the queuing stage is started;
a queuing stage, which judges the number of the bin pumps which are conveying dry ash; when the number of the bin pumps which are conveying dry ash is not less than the set number of the maximum bin pumps allowed to operate in the comparison module, queuing the bin pumps at present; when the number of bin pumps which are conveying dry ash is smaller than the set number of the maximum bin pumps which are allowed to run in the comparison module, ending the queuing stage and entering a pressurizing and fluidizing stage;
in the pressurizing and fluidizing stage, the controller controls the opening of a primary air valve and the starting of an air compressor; when the air inlet fluidization time reaches the preset fluidization time, ending the pressurization fluidization stage, and entering a conveying stage;
in the conveying stage, the controller controls the discharge valve and the tertiary air valve to be opened and controls the air compressor to be started; when the pressure value detected by the pressure sensor is reduced to a preset value in the detection module, the conveying stage is ended, and the purging stage is started;
in the purging stage, the primary air valve, the tertiary air valve, the discharge valve, the first air compressor and the second air compressor are kept open; when the purging time reaches the preset purging time, the controller controls the primary air valve, the tertiary air valve, the discharge valve, the first air compressor and the second air compressor to be closed, the purging stage is finished, and the waiting stage is started;
in the waiting stage, all valves are in a closed state; and when the waiting time reaches the preset waiting time, ending the waiting stage and entering a feeding stage.
By adopting the technical scheme, each bin pump enters the queuing stage after the feeding stage. After each bin pump enters the queuing stage, when the number of the bin pumps which are running is not less than the set number, the controller can control the corresponding bin pumps to carry out sequential queuing; when the number of the bin pumps which are in operation is less than the set number, the controller controls the bin pumps which are queued at the front to enter the pressurized fluidization stage. The intelligent control of each bin pump is realized, the stability of the number of the bin pumps in operation is ensured, the resource is saved, the loss of equipment is reduced, and the service life of the equipment is prolonged.
Further, in the queuing stage, when the number of bin pumps which are conveying dry ash is smaller than the set number of the maximum bin pumps which are allowed to operate in the comparison module or the queuing time corresponding to the bin pumps exceeds the preset queuing time, the queuing stage is ended and the pressure fluidization stage is started.
By adopting the technical scheme, the condition that dry ash is attached to the inner wall of the bin pump and is difficult to clean due to the fact that the bin pump stays for too long time in the queuing stage can be avoided, and the working stability of the system is improved.
Further, after the queuing stage is finished, the corresponding bin pump enters a gas waiting state; and when the gas waiting time corresponding to the bin pump reaches the preset gas waiting time, entering a pressurizing and fluidizing stage.
By adopting the technical scheme, the program and the buffering time for each device to enter the next stage are given, and the loss of each device is favorably reduced.
Further, in the conveying stage, when the pressure value detected by the pressure sensor is reduced to a preset value in the detection module or the conveying time of the conveying pipe exceeds the preset conveying time, the conveying stage is ended and the purging stage is started.
By adopting the technical scheme, the long-time stay of the bin pump in the conveying stage caused by the damage of the pressure sensor is avoided, the work of the subsequent bin pump is not influenced, and the fault-tolerant rate of the system is improved.
Further, in the conveying stage, when the pressure value detected by the pressure sensor is greater than a preset pressure threshold value, the detection module controls the alarm to send out an alarm signal.
By adopting the technical scheme, the abnormal condition that the pressure of the conveying pipe is too large is conveniently prompted to an operator.
In conclusion, the invention has the following beneficial effects:
1. through the arrangement of the controller, the effect of saving resources is facilitated;
2. through the arrangement of the detection module, the pressure sensor and the timing module, the effect of conveniently controlling the working state of each bin pump is achieved;
3. through the setting of alarm, have the effect that conveniently reminds operator's conveyer pipe pressure abnormal conditions.
Drawings
FIG. 1 is a schematic diagram for showing the connection relationship between a controller and a unit in embodiments 1 and 2;
FIG. 2 is a schematic diagram of the unit structure according to embodiments 1 and 2;
fig. 3 is a schematic diagram for embodying the energy-saving ash conveying flow of the power plant in embodiment 2.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Example 1:
an energy-saving ash conveying system of a power plant, referring to fig. 1, the power plant comprises an ash storehouse and a plurality of ash buckets, the ash buckets correspond to dust collectors of the power plant, and the ash storehouse is used for storing dry ash. The energy-saving ash conveying system comprises a controller and a plurality of units, and the controller is a PLC. Each unit is correspondingly connected with each ash bucket and used for conveying dry ash to the ash storehouse. The controller is connected with each unit and is used for controlling the operation of each unit. When the number of the units which are conveying ash is not less than the set number, the controller controls other units to suspend working and carry out sequential queuing. When the number of the units which are running is smaller than the set number, the controller controls the units which are queued at the front to convey ash.
Referring to fig. 1, the controller includes a register in which the number of units in operation is recorded, and a comparison module in which a set number of the maximum unit allowed to operate is stored. And if the number of the units which are used for conveying the ash and recorded in the register is less than the set number of the maximum units which are stored in the comparison module and allowed to operate, the controller controls the units which are queued in front to convey the ash.
Referring to fig. 2, the unit comprises a bin pump, and a feed valve, a balance valve, a discharge valve, a first air compressor, a second air compressor, a primary air valve and a tertiary air valve which are connected with a controller. A feeding pipeline is communicated between the bin pump and the ash bucket, and a conveying pipe is communicated between the bin pump and the ash bin. The feed valve is arranged on the feed pipeline, the discharge valve is arranged on the conveying pipe, and the balance valve is arranged on the bin pump. And a first air inlet pipe is connected between the first air compressor and the bin pump, and a second air inlet pipe is connected between the second air compressor and the bin pump. The primary air valve is arranged on the first air inlet pipe, and the tertiary air valve is arranged on the second air inlet pipe.
Referring to fig. 1 and 2, the controller further includes a timing module and a detection module, and a pressure sensor is disposed on the delivery pipe, and is connected to the controller and used for detecting the pressure of the delivery pipe. The detection module is used for operating the timing module to start timing when the pressure value detected by the pressure sensor is smaller than a preset value in the detection module. The detection module is also used for controlling the corresponding bin pump to suspend ash conveying after the timing module counts the preset time length stored in the detection module. The controller is connected with an alarm, and the detection module is also used for controlling the alarm to send out an alarm signal when the pressure value detected by the pressure sensor is greater than a pressure threshold value preset in the detection module. In this embodiment, the alarm is a warning lamp or a buzzer.
The working principle is as follows:
each bin pump for conveying dry ash to the ash bin is correspondingly connected to each ash bucket, and the controller is connected with each bin pump. When the number of bin pumps which are conveying ash is not less than the set number of the maximum unit which is allowed to operate in the comparison module, the controller controls other bin pumps to suspend ash conveying and perform sequential queuing. When the number of bin pumps which are conveying ash is smaller than the set number of the maximum unit which is allowed to operate in the comparison module, the controller can control the bin pump which is queued in front to convey ash. The intelligent control of each bin pump is realized, the stability of the number of the bin pumps in operation is ensured, the energy waste and the equipment loss are avoided, and the energy-saving control method is favorable for saving resources.
Example 2:
an energy-saving ash conveying method for a power plant based on the energy-saving ash conveying system of the power plant in the embodiment 1 is disclosed, and referring to fig. 2 and 3, a bin pump is used for one working cycle for conveying one group of dry ash, and each working cycle comprises the following stages:
in the feeding stage, the controller controls the balance valve and the feeding valve to open, and dry ash in the corresponding ash bucket freely falls into the bin pump under the action of gravity; when the opening time of the balance valve and the feeding valve reaches the preset opening time T1, the controller controls the balance valve and the feeding valve to be closed, the feeding stage is ended, and the queuing stage is started;
and a queuing stage, namely judging the number of bin pumps which are conveying dry ash. When the number of bin pumps which are used for conveying dry ash and are recorded in a register (refer to fig. 1) is not less than the set number of the maximum bin pumps which are allowed to run in a comparison module (refer to fig. 1), queuing the current bin pumps; when the number of the bin pumps which are conveying the dry ash is smaller than the set number of the maximum bin pumps which are allowed to run in the comparison module or the queuing time of the corresponding bin pump exceeds the preset queuing time T6, ending the queuing stage and enabling the corresponding bin pump to enter a gas waiting state; when the gas waiting time of the corresponding bin pump reaches the preset gas waiting time T2, entering a pressurizing and fluidizing stage;
in the pressurizing and fluidizing stage, the controller controls the opening of the primary air valve and the starting of the air compressor, the treated compressed air fluidizes the dry ash in the bin pump, and meanwhile, the pressure in the bin pump is increased; when the air inlet fluidization time reaches the preset fluidization time T3, ending the pressurization fluidization stage and entering the conveying stage;
in the conveying stage, the controller controls the discharge valve and the tertiary air valve to be opened and controls the air compressor to be started, at the moment, the bin pump continuously feeds air, dry ash enters the conveying pipe through the discharge valve, and the dry ash is always in a state of fluidization and conveying; when the dry ash in the bin pump is conveyed, the pressure of the conveying pipe is reduced, and the pressure value detected by the pressure sensor is reduced; when the pressure value detected by the pressure sensor is greater than a pressure threshold value preset in the detection module (refer to fig. 1), the detection module controls an alarm (refer to fig. 1) to send out an alarm signal; when the pressure value detected by the pressure sensor is reduced to a preset value in the detection module or the conveying time of the conveying pipe exceeds the preset conveying time T7, the conveying stage is ended and the purging stage is started;
in the purging stage, the primary air valve, the tertiary air valve, the discharge valve, the first air compressor and the second air compressor are kept opened, and the bin pump and the conveying pipe are purged; when the purging time reaches the preset purging time T4, the controller controls the primary air valve, the tertiary air valve, the discharge valve, the first air compressor and the second air compressor to be closed, the purging stage is finished, and the waiting stage is started;
in the waiting stage, all valves are in a closed state; when the waiting time reaches the preset waiting time T5, the waiting phase is ended and the next working cycle is entered.
Referring to fig. 1, the controller further includes a definition module, the definition module defines a switching variable coil a, an allowable bin pump delivery coil b, and a feeding end coil c, and the coil a, the allowable bin pump delivery coil b, and the feeding end coil c are all 0 initially.
Referring to fig. 2 and 3, the gas waiting time T2 of the bin pump in the gas waiting state is set to 5 seconds, and when the gas waiting time of the bin pump exceeds 3 seconds, the bin pump is judged to enter the pressurized fluidization phase, and at this time, the controller sets the coil a as the flag. After the purging stage of the bin pump is finished, the conveying end of the bin pump is judged, and at the moment, the controller resets the coil a. And the controller judges each bin pump, accumulates by using the rising edge of the coil a and accumulates by using the falling edge of the coil a, so that the number of bin pumps which are conveying ash at the moment is obtained and stored in the register.
Referring to fig. 2 and 3, the number of bin pumps which are conveying ash in the register (see fig. 1) is compared with the set number of the maximum bin pumps which are allowed to operate in the comparison module (see fig. 1), and if the number of bin pumps which are conveying ash in the register is smaller than the set number of the maximum bin pumps which are allowed to operate in the comparison module, the controller sets the allowed bin pump transmitting coil b. During the feeding phase, when the feeding valve is closed, the controller judges that the feeding is finished, thereby setting the feeding-finished coil c. When the bin pump conveying coil b and the feeding ending coil c corresponding to the corresponding bin pump are allowed to be set at the same time, the controller controls the bin pump which is in the queuing stage and is in front of the queuing stage to enter a gas waiting state, and resets the feeding ending coil c corresponding to the bin pump.
Claims (8)
1. An energy-saving ash conveying system of a power plant is characterized in that the power plant comprises a plurality of ash hoppers corresponding to dust collectors and an ash storehouse for storing dry ash; the energy-saving ash conveying system comprises:
the units are correspondingly connected with the ash hoppers and used for conveying dry ash to the ash storehouse; the controller is connected with each unit and used for controlling the operation of each unit;
the controller is used for controlling other units to pause and queue in sequence when the number of the units in operation is not less than a set number; the controller is also used for controlling the ash conveying of the unit with the front queue when the number of the running units is less than a set number;
the controller comprises a register for recording the number of the running machine sets and a comparison module for storing the set number of the maximum machine set allowed to run, wherein the comparison module is used for comparing the number of the running machine sets recorded in the register with the set number stored in the comparison module;
the unit comprises a bin pump, a feed valve, a balance valve, a discharge valve, a first air compressor, a second air compressor, a primary air valve and a tertiary air valve, wherein the feed valve, the balance valve, the discharge valve, the first air compressor, the second air compressor, the primary air valve and the tertiary air valve are connected with a controller; a feeding pipeline is connected between the bin pump and the ash bucket, and a conveying pipe is connected between the bin pump and the ash bin; the feed valve is arranged on the feed pipeline, the discharge valve is arranged on the conveying pipe, and the balance valve is arranged on the bin pump; a first air inlet pipe is connected between the first air compressor and the bin pump, and a second air inlet pipe is connected between the second air compressor and the bin pump; the primary air valve is arranged on the first air inlet pipe, and the tertiary air valve is arranged on the second air inlet pipe.
2. The power plant energy saving ash conveying system of claim 1, wherein: the controller comprises a timing module and a detection module, and a pressure sensor which is connected with the controller and is used for detecting the pressure of the conveying pipe is arranged on the conveying pipe; the detection module is used for operating the timing module to start timing when the pressure value detected by the pressure sensor is smaller than a preset set value; the detection module is also used for controlling the corresponding bin pump to suspend ash conveying after the timing module counts the preset time length.
3. The power plant energy saving ash conveying system of claim 2, characterized in that: the controller is connected with an alarm, and the detection module is also used for controlling the alarm to send out an alarm signal when the pressure value detected by the pressure sensor is greater than a preset pressure threshold value.
4. An energy-saving ash conveying method for a power plant, which is characterized in that the energy-saving ash conveying method for the power plant is based on the energy-saving ash conveying system for the power plant in claim 3, the bin pump has a working cycle for conveying a group of dry ash, and each working cycle comprises the following stages:
in the feeding stage, the controller controls the balance valve and the feeding valve to be opened; when the opening time of the balance valve and the feeding valve reaches the preset opening time, the controller controls the balance valve and the feeding valve to be closed, the feeding stage is ended, and the queuing stage is started;
a queuing stage, which judges the number of the bin pumps which are conveying dry ash; when the number of the bin pumps which are conveying dry ash is not less than the set number of the maximum bin pumps allowed to operate in the comparison module, queuing the bin pumps at present; when the number of bin pumps which are conveying dry ash is smaller than the set number of the maximum bin pumps which are allowed to run in the comparison module, ending the queuing stage and entering a pressurizing and fluidizing stage;
in the pressurizing and fluidizing stage, the controller controls the opening of a primary air valve and the starting of an air compressor; when the air inlet fluidization time reaches the preset fluidization time, ending the pressurization fluidization stage, and entering a conveying stage;
in the conveying stage, the controller controls the discharge valve and the tertiary air valve to be opened and controls the air compressor to be started; when the pressure value detected by the pressure sensor is reduced to a preset value in the detection module, the conveying stage is ended, and the purging stage is started;
in the purging stage, the primary air valve, the tertiary air valve, the discharge valve, the first air compressor and the second air compressor are kept open; when the purging time reaches the preset purging time, the controller controls the primary air valve, the tertiary air valve, the discharge valve, the first air compressor and the second air compressor to be closed, the purging stage is finished, and the waiting stage is started;
in the waiting stage, all valves are in a closed state; and when the waiting time reaches the preset waiting time, ending the waiting stage and entering a feeding stage.
5. The power plant energy saving ash conveying method according to claim 4, characterized in that: in the queuing stage, when the number of bin pumps which are conveying dry ash is smaller than the set number of the maximum bin pumps which are allowed to operate in the comparison module or the queuing time corresponding to the bin pumps exceeds the preset queuing time, the queuing stage is ended, and the pressure fluidization stage is started.
6. The power plant energy saving ash conveying method according to claim 5, characterized in that: after the queuing stage is finished, the corresponding bin pump enters a gas waiting state; and when the gas waiting time corresponding to the bin pump reaches the preset gas waiting time, entering a pressurizing and fluidizing stage.
7. The power plant energy saving ash conveying method according to claim 4, characterized in that: in the conveying stage, when the pressure value detected by the pressure sensor is reduced to a preset value in a detection module or the conveying time of the conveying pipe exceeds the preset conveying time, the conveying stage is ended, and the purging stage is started.
8. The power plant energy saving ash conveying method according to claim 7, characterized in that: in the conveying stage, when the pressure value detected by the pressure sensor is greater than a preset pressure threshold value, the detection module controls an alarm to send out an alarm signal.
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| CN201810864564.8A CN108910541B (en) | 2018-08-01 | 2018-08-01 | Energy-saving ash conveying system and method for power plant |
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| CN201810864564.8A CN108910541B (en) | 2018-08-01 | 2018-08-01 | Energy-saving ash conveying system and method for power plant |
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| CN108910541B true CN108910541B (en) | 2020-05-22 |
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| CN109850517B (en) * | 2019-04-02 | 2020-12-04 | 华北电力科学研究院有限责任公司 | Intelligent ash conveying method and device for power plant |
| CN111596632B (en) * | 2020-06-09 | 2022-02-22 | 汤传金 | Coal fired power plant ash conveying control optimization system |
| CN112799362A (en) * | 2020-12-31 | 2021-05-14 | 华能南京金陵发电有限公司 | Pneumatic ash conveying abnormal state diagnosis and fault early warning method |
| CN114348668A (en) * | 2022-01-05 | 2022-04-15 | 国家能源集团国源电力有限公司 | Ash conveying control method and control device |
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| JPS6251511A (en) * | 1985-08-29 | 1987-03-06 | Mitsubishi Heavy Ind Ltd | Pipe conveying method for different grain size solid substance-mixed slurry |
| CN102981480B (en) * | 2012-11-28 | 2015-04-15 | 白永军 | Dust output control method and control system |
| CN204588106U (en) * | 2014-12-18 | 2015-08-26 | 大唐贵州发耳发电有限公司 | The defeated ash in a kind of power plant props up wire system |
| CN206606767U (en) * | 2017-03-24 | 2017-11-03 | 广东荣昇环保科技有限公司 | A kind of air-transport system of boiler slag |
| CN206872024U (en) * | 2017-05-26 | 2018-01-12 | 山西瑞光热电有限责任公司 | A kind of thermal power plant's compressed air distribution system |
| CN107285039B (en) * | 2017-06-26 | 2023-04-14 | 华电电力科学研究院有限公司 | Pneumatic ash conveying method and device for thermal power plant material level control |
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