CN111156503A - Slag sorting and conveying system and sorting and conveying method for circulating fluidized bed - Google Patents

Slag sorting and conveying system and sorting and conveying method for circulating fluidized bed Download PDF

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Publication number
CN111156503A
CN111156503A CN202010067119.6A CN202010067119A CN111156503A CN 111156503 A CN111156503 A CN 111156503A CN 202010067119 A CN202010067119 A CN 202010067119A CN 111156503 A CN111156503 A CN 111156503A
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China
Prior art keywords
slag
conveying
bin
pipeline
door
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Pending
Application number
CN202010067119.6A
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Chinese (zh)
Inventor
马涛
李克章
惠建飞
陈勇
魏庆超
李小东
朱海
叶林
程滨
吕剑
周逸群
郑玉波
杨佳伟
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Qinhuangdao Qinhe Power Generating Co ltd
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Qinhuangdao Qinhe Power Generating Co ltd
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Application filed by Qinhuangdao Qinhe Power Generating Co ltd filed Critical Qinhuangdao Qinhe Power Generating Co ltd
Priority to CN202010067119.6A priority Critical patent/CN111156503A/en
Publication of CN111156503A publication Critical patent/CN111156503A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00—Fluidised bed combustion apparatus
    • F23C10/18—Details; Accessories
    • F23C10/28—Control devices specially adapted for fluidised bed, combustion apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00—Fluidised bed combustion apparatus
    • F23C10/18—Details; Accessories
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00—Fluidised bed combustion apparatus
    • F23C10/18—Details; Accessories
    • F23C10/24—Devices for removal of material from the bed

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)

Abstract

The invention provides a slag sorting and conveying system for a circulating fluidized bed, which comprises a hearth and a large slag bin, wherein the large slag bin is communicated with a slag outlet of a boiler of the circulating fluidized bed through a hoisting machine, a slag discharging pipeline close to an inlet of the large slag bin is communicated and arranged on a slag discharging pipeline of the hoisting machine, an inlet of the material distributing pipeline is provided with a screen, an outlet of the material distributing pipeline is communicated with a bin pump, the bin pump is connected with the hearth through a conveying pipeline, an opening and closing adjusting mechanism for controlling the opening and closing of the conveying pipeline is arranged on the conveying pipeline, and the slag sorting and conveying system further comprises a PLC (programmable logic controller) which is used for controlling the opening and closing of the pipeline. The invention also provides a method for sorting and conveying the slag by using the slag sorting and conveying system. The slag discharged by the boiler is recycled by the invention, so that the production cost is reduced. The invention realizes automatic separation and conveying of slag, saves time and labor and improves working efficiency.

Description

Slag sorting and conveying system and sorting and conveying method for circulating fluidized bed
Technical Field
The invention relates to a slag sorting and conveying technology, in particular to slag sorting and conveying equipment and a slag sorting and conveying method for a circulating fluidized bed.
Background
During the operation of the existing circulating fluidized bed boiler under heavy load, the phenomenon of overtemperature can be caused due to uneven heat transfer caused by small concentration of solid particles in a dilute phase zone of a hearth. The boiler is in an overtemperature state for a long time, so that the conditions of pipe wall damage, hearth coking, castable shedding and the like of the boiler occur, the normal operation of equipment is influenced, and the service life is shortened. Moreover, the boiler is overtemperature for a long time, and the temperature of the hearth directly influences SO2、NOXWhen environmental protection parameters are generated, if the denitration deep emission reduction transformation is not carried out on the boiler, NO is required to be generatedXThe emission value was adjusted to 30mg/Nm3In the following, the ultra-low emission is realized, and the consumption of limestone and urea is also required to be increased, so that the processing technology is complicated, and the production cost is increased.
When the circulating fluidized bed boiler operates, after the boiler combustion is completed, the slag charge is transported to a large slag bin through the elevator for recycling and storage, and in fact, part of the slag charge after use can be recycled, and if the slag charge is directly transported to the large slag bin, a lot of unnecessary waste is caused. In addition, the size and the weight of the used furnace burden need to meet preset requirements, so the furnace burden needs to be sorted, and the prior furnace burden sorting step is generally to manually screen the furnace burden, transport the furnace burden to a coal yard by an automobile, and finally send the furnace burden to a hearth through a coal hopper, a coal conveying line, a coal bunker and a coal supply line, so that the process is complex and the time is long.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a slag sorting and conveying system for a circulating fluidized bed, which realizes automatic sorting and conveying of slag, improves the working efficiency and reduces the cost.
In order to achieve the purpose, the invention provides a slag sorting and conveying system for a circulating fluidized bed, which comprises a hearth and a large slag bin, wherein the large slag bin is communicated with a slag outlet of a boiler of the circulating fluidized bed through a hoisting machine, a slag discharging pipeline close to an inlet of the large slag bin is communicated and arranged on a hoisting machine, an inlet of the slag discharging pipeline is provided with a screen, an outlet of the slag discharging pipeline is communicated with a bin pump, the bin pump is connected with the hearth through a conveying pipeline, an opening and closing adjusting mechanism for controlling the opening and closing of the conveying pipeline is arranged on the conveying pipeline, and the slag sorting and conveying system further comprises a PLC (programmable logic controller) which is used for controlling the opening and closing of the pipeline and can edit.
The further improvement is that: the outlet of the material distribution pipeline is communicated with the bin pump through the fine material bin, the output end of the fine material bin is provided with a dome valve, and the dome valve is connected with the PLC.
The further improvement is that: the opening and closing adjusting mechanism comprises a pneumatic valve assembly connected with the PLC, the pneumatic valve assembly comprises a coal feeding point pneumatic valve arranged on the conveying pipeline, and a mixer outlet door is arranged on a pipeline between the coal feeding point pneumatic valve and the bin pump and close to the bin pump outlet.
The further improvement is that: the bin pump outlet is also connected with a compressed air conveying pipe, and a mixer inlet door is arranged at the position, close to the bin pump outlet, of the compressed air conveying pipe.
The mixer comprises a mixer inlet door, a mixer outlet door, a pressure adjusting pipe, a conveying main pipe disturbance air door and a pressure adjusting pipe, wherein the front of the input end of the mixer inlet door and the rear of the output end of the mixer outlet door are connected in a bridging mode to form the pressure adjusting pipe, and the conveying main pipe disturbance air door is arranged on the pressure adjusting pipe.
The further improvement is that: the pneumatic valve assembly further comprises a blanking pneumatic valve arranged on the material distributing pipeline.
Another object of the present invention is to provide a slag sorting and conveying method for a circulating fluidized bed, which is accomplished using the above slag sorting and conveying system.
The method comprises the following steps:
s1, starting a blanking pneumatic door on the material distribution pipeline, sorting slag through a screen, transferring the slag to a fine material bin, and starting blanking;
s2, when the storage amount of the slag in the fine aggregate bin meets the requirement, closing a blanking pneumatic valve, opening a dome valve, entering a conveying state, and transferring the slag in the fine aggregate bin to a bin pump;
s3, after the height of the slag in the bin pump reaches a preset position, closing the dome valve and stopping feeding the bin pump;
s4, opening a coal feeding point pneumatic door and a mixer outlet door on a conveying pipeline, and conveying slag to the hearth;
s5, after the primary conveying of the slag in the step S4 is finished, judging the next step by the PLC according to the storage amount of the slag in the fine aggregate bin, and repeating the steps S2-S4 when the storage amount is enough; when the storage amount is insufficient, step S1 is repeated until the storage amount satisfies the requirement.
Wherein, the steps S1, S2, S3 and S4 are controlled by a PLC controller, and the PLC controller writes a control program by using the pressure data of the measuring and conveying pipeline.
Preferably, when the pressure data of the conveying pipeline is greater than 270Kpa during the operation of the operation step S4 under the control of the PLC controller, the conveying main pipe disturbance damper is opened, and the pressure adjusting pipe is communicated to perform pressure compensation on the conveying pipeline; and when the pressure data of the conveying pipeline is less than 200Kpa, closing the conveying main pipe disturbance air door 11 and conveying the slag to the hearth.
The invention has the beneficial effects that:
the invention recycles the slag discharged by the boiler, thereby reducing the production cost. The automatic sorting and conveying are completed by controlling the on-off of the conveying pipeline through the opening and closing adjusting mechanism, time and labor are saved, and the working efficiency is improved. The invention realizes that the waste slag is screened out by the screen to realize the repeated reuse, reduces the disposal cost of the boiler bottom slag of the company and increases the practical economic benefit.
The slag materials are sorted by a proper screen, the slag materials with proper grain sizes are used as available slag to be transferred to a bin pump for recycling, and the slag materials with improper grain sizes are returned to a large slag bin. The screen mesh with different particle sizes can be replaced at any time according to the requirements, so that various actual production requirements are met, and the application range is wide.
The furnace slag with the required particle size is automatically conveyed to the corresponding coal feeding point of the hearth through the furnace slag sorting and conveying system to participate in combustion adjustment, so that the problem that the heating surface of the circulating fluidized bed boiler is over-heated for a long time due to less ash content and uneven circulation of the coal is solved. Automatic screening, sorting, storage and automatic conveying of slag charge to furnace are realized through program control, do not need the people on duty, realize whole journey automated management. The coal is prevented from being transported to an accident coal hopper by an automobile and then is sent to a hearth through a coal conveying line, a coal bunker and a coal feeding line, and the production efficiency is improved.
And in the conveying process, the slag sorting and conveying system carries out corresponding judgment and processing according to the measured pressure data of the conveying pipeline without manual intervention, and sends out corresponding alarm information to prompt workers.
Drawings
FIG. 1: the structure schematic diagram of the automatic conveying system for slag separation of the invention;
FIG. 2: the invention discloses a program control flow diagram of a slag sorting automatic conveying system.
Description of the reference numerals
1. The device comprises a bucket elevator, 2, a screen, 3, a rapping motor, 4, a blanking pneumatic door, 5, a fine material bin, 6, a dome valve, 7, a bin pump, 8, a balance valve, 9, a mixer inlet door, 10, a mixer outlet door, 11, a conveying main pipe disturbance air door, 12, #2 coal feeding point pneumatic door, 13, #3 coal feeding point pneumatic door, 14, a hearth, 15, a slag bin, 16, a fine material bin high material level, 17, a fine material bin low material level, 18, a bin pump high material level, 19, a compressed air pressure measuring point, 20, a conveying main pipe pressure measuring point, 21, a branch pipe, 22, a conveying pipeline, 23, a pressure adjusting pipe, 24 and a communication main pipe.
Detailed Description
The technical scheme in the embodiment of the invention is clearly and completely described below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
The invention provides a slag sorting and conveying system for a circulating fluidized bed, which has a structure shown in figure 1 and mainly comprises a large slag bin 15, a fine material bin 5, a bin pump 7 and a hearth 14 which are connected through pipelines respectively, a PLC (programmable logic controller) written with a program and an opening and closing adjusting mechanism for controlling the communication and closing of the pipelines.
The large slag bin 15 is communicated with a slag outlet of a boiler of the circulating fluidized bed through a lifter, the large slag bin 15 is used for storing slag, and the lifter is a bucket type lifter 1 or other types. The opening and closing adjusting mechanism comprises a pneumatic valve component connected with a PLC controller. The PLC controller is Siemens S7-200PLC, or other controllers capable of editing and writing programs, and is placed in the control cabinet.
An opening is formed in the position, close to the inlet of the large slag bin 15, of the slag discharging pipeline of the bucket elevator 1, a material distribution pipeline 21 is connected and arranged at the opening, a screen 2 is arranged at the connecting position of the slag discharging pipeline and the material distribution pipeline 21 and used for screening slag, and the size of a screen hole of the screen 2 is selected and changed as required. A rapping motor 3 is also arranged on the material separating pipeline 21 close to the screen 2, so that slag materials can conveniently fall into the material separating pipeline 21, and the screen 2 is prevented from being blocked by the slag materials. The slag is sorted by a proper screen 2, the slag with proper grain size is transferred to the next step as available slag for recycling, and the slag with improper grain size returns to the large slag bin 15.
The automatic feeding device is characterized in that a feeding pneumatic door 4 is arranged on the feeding pipeline 21, the feeding pneumatic door 4 is controlled to be switched by a PLC (programmable logic controller), an outlet of the feeding pipeline 21 is communicated with a bin pump 7, and a fine material bin 5 is arranged between the bin pump 7 and an outlet of the feeding pipeline 21. The output end of the fine material bin 5 is provided with a dome valve 6, and the dome valve 6 is controlled to be switched by a PLC (programmable logic controller). When the dome valve 6 is opened, the slag in the fine silo 5 falls down into the silo pump 7. Meanwhile, a fine material bin high material level 16 and a fine material bin low material level 17 are arranged on the bin wall of the fine material bin 5 and used for monitoring the height of the slag in the fine material bin 5 in real time and feeding the result back to the PLC. When the height of the slag reaches 16 high material level of the fine material bin, the blanking pneumatic door 4 is closed, and the material is stopped being conveyed to the fine material bin 5; when the slag level is lower than the low level 17 of the fine material bin, the dome valve 6 is closed, and feeding to the pump bin 7 is stopped. Further, a balance pipe is communicated between the fine material bin 5 and the bin pump 7, a balance valve 8 controlled by a PLC is arranged on the balance pipe, and pressure balance between the fine material bin 5 and the bin pump 7 is maintained through the balance pipe. The bin pump 7 is internally provided with a bin pump high material level 18 for monitoring the height of the slag storage amount in the bin pump 7 in real time and feeding the result back to the PLC.
The bin pump 7 is connected with the hearth 14 through a conveying pipeline 22, and an opening and closing adjusting mechanism for controlling the opening and closing of the conveying pipeline 22 is arranged on the conveying pipeline 22. The opening and closing adjusting mechanism comprises a pneumatic valve assembly connected with a PLC (programmable logic controller), the pneumatic valve assembly comprises a coal feeding point pneumatic valve arranged on a conveying pipeline 22, the number of the coal feeding point pneumatic valve is determined according to the structure of a hearth, the hearth used in the embodiment is divided into four feeding ports on the left side and the right side for feeding and burning, the numbers #2 and #3 respectively correspond to the feeding ports on the left side and the right side, and therefore two sets of the coal feeding point pneumatic valve are arranged corresponding to the numbers #2 and # 3. Namely, two conveying branch pipes are respectively arranged at the position of the conveying pipeline 22 close to the hearth 14, and each conveying branch pipe is provided with a coal feeding point pneumatic door, as shown in fig. 1, a #2 coal feeding point pneumatic door 12 and a #3 coal feeding point pneumatic door 13.
The pneumatic valve assembly also includes a mixer outlet gate 10 disposed on the line of the delivery line 22 near the outlet of the bin pump 7. The outlet position of the bin pump 7 is further connected with a compressed air delivery pipe, the position of the compressed air delivery pipe, which is close to the outlet of the bin pump 7, is provided with a communication main pipe 24, and the communication main pipe 24 is used for delivering compressed air in a pipeline of the slag separation and delivery system to maintain the air pressure required by the system. And a mixer inlet door 9 is arranged on the communication main pipe 24 and close to the outlet of the bin pump 7, and the mixer inlet door 9 is controlled to be opened and closed by a PLC (programmable logic controller).
The pressure adjusting pipe 23 is erected in the front of the input end of the mixer inlet door 9 and the rear of the output end of the mixer outlet door 10 in a crossing mode, the pressure adjusting pipe 23 is provided with a conveying main pipe disturbance air door 11, and the conveying main pipe disturbance air door 11 is connected with the PLC.
A compressed air pressure measuring point 19 is arranged on a communication main pipe 24 at the front end of a pressure adjusting pipe 23, a conveying main pipe pressure measuring point 20 is arranged on a conveying pipeline 22 at the rear end of the pressure adjusting pipe 23, and the compressed air pressure measuring point 19 and the conveying main pipe pressure measuring point 20 are respectively connected with a PLC (programmable logic controller). The compressed air pressure measuring point 19 is used for measuring the pressure of the communicating main pipe 24 and feeding back the result to the PLC controller for logic operation. The conveying main pipe pressure measuring point 20 is used for measuring and monitoring the pressure of the conveying pipeline in real time and feeding back the result to the PLC for logic operation.
The invention also provides a slag sorting and conveying method for the circulating fluidized bed, which is completed by using the slag sorting and conveying system.
The method comprises the following steps:
s1, starting a discharging pneumatic door 4 on the material distributing pipeline 21, sorting the slag through a screen 2, transferring the slag to a fine material bin 5, and starting discharging;
s2, when the storage amount of the slag in the fine material bin 5 meets the requirement, namely the height reaches the high material level 16 of the fine material bin, the high material level 16 of the fine material bin feeds back a signal to the PLC controller, at the moment, the PLC controller controls the blanking pneumatic door 4 to be closed, and simultaneously opens the dome valve 6 to enter a conveying state, so that the slag in the fine material bin 5 is conveyed to the bin pump 7;
s3, after the height of the slag in the bin pump 7 reaches the position of the bin pump high material level 18, after the PLC receives a signal of the bin pump high material level 18, the PLC controls to close the dome valve 6 and stop feeding the bin pump 7;
s4, the PLC opens the pneumatic door 12 of the #2 coal feeding point, the pneumatic door 13 of the #3 coal feeding point and the mixer outlet door 10 on the conveying pipeline 22, and slag is conveyed to the hearth 14;
s5, after the primary conveying of the slag in the step S4 is finished, judging the next step by the PLC according to the storage amount of the slag in the fine material bin 5, and repeating the steps S2-S4 when the storage amount is enough and the PLC does not receive a signal of the low material level 17 of the fine material bin, namely the height of the PLC is higher than the low material level 17 of the fine material bin; when the PLC receives the signal of the low material level 17 of the fine material bin, the storage amount is insufficient, the step S1 is repeated at the moment, the fine material bin 5 is fed until the storage amount meets the requirement, and the steps S2-S4 are repeated.
Preferably, when the PLC controller controls the operation of the operation step S4, when the pressure data of the conveying pipeline 22 is greater than 270kPa, the conveying main pipe disturbance damper 11 is opened, and the communication pressure adjusting pipe 23 performs pressure compensation on the conveying pipeline 22; when the pressure data of the conveying pipeline 22 is less than 200kPa, the conveying main pipe disturbance damper 11 is closed, and the slag is conveyed to the hearth 14.
In the embodiment, all the switches are controlled to operate by the PLC controller, that is, all the switches are switched on and off by using a pneumatic principle, that is, the switches are switched on and off by using compressed air, and meanwhile, a control program in the PLC controller is programmed by using real-time pressure data of the measurement conveying pipeline 22, and when the PLC controller is actually used, a person skilled in the art can change the switch according to an actually required condition.
The PLC controller of the embodiment adopts Siemens S7-200PLC to program, the PLC controller is placed in a control cabinet beside the equipment, and the PLC controller written with the program regulates and controls the operation of the whole system. The main control principle is as follows:
as shown in FIG. 2, when the program is started, step S1 is executed to determine the low level 17 of the fine material bin, and if the fine material bin is at the low level, the feeding pneumatic door 4 and the rapping motor 3 on the material distribution pipeline 21 are started to start feeding. In the actual production, the bucket elevator can be provided with a plurality of bucket elevators, and when any one bucket elevator is started, the corresponding blanking pneumatic door 4 and the corresponding rapping motor 3 are started according to judgment by a set program.
When the low material level 17 of the fine material bin does not feed back a signal any more, namely the storage amount in the fine material bin 5 meets the requirement and meets the conveying condition, the step S2 is automatically started at the moment, the blanking pneumatic door 4 and the rapping motor 3 are closed, and the dome valve 6 is opened to enter the conveying state.
After entering the conveying state, the dome valve 6 and the balance valve 8 are both opened, and the slag is transferred into the bin pump 7. When the bin pump high level 18 occurs, i.e. the bin pump 7 is full of slag, the dome valve 6 and the counter balance valve 8 are closed and step S4 is performed. In this step, the PLC control program also sets fault monitoring: when the dome valve 6 and the balance valve 8 are opened for 1 minute, the bin pump high material level 18 still has no feedback signal, the system can send out a fault alarm, and the system is closed to wait for confirmation of a worker.
In step S4, the #2 coaling point pneumatic door 12, the #3 coaling point pneumatic door 13, the mixer outlet door 10, and the mixer inlet door 9 are opened in this order, and slag is fed to the furnace 14. Before starting the transportation, the PLC controller judges from the data of the compressed air pressure measuring point 19 whether or not the pressure in the transportation pipe 22 meets the required pressure, and if so, executes step S5.
In the beginning stage of conveying, because the conveying pipeline is not completely filled with materials, the displayed pressure may be inaccurate, and in order to prevent the program from misjudging, the steps that compressed air is conveyed by the communicating main pipe 24 firstly, and after air is fed for 80 seconds, the program automatically judges the required operation according to the conveying main pipe pressure measuring point 20 are designed.
When the pressure measuring point 20 of the conveying main pipe shows that the pressure is less than 30kPa, the mixer inlet door 9 and the mixer outlet door 10 are closed when the furnace slag in the bin pump 7 is considered to be completely conveyed. Then, whether the fine material bin low material level 17 sends a feedback signal is detected, if no signal is sent, the fine material bin 5 is indicated to have material, and step S2 is started, and the next conveying is automatically carried out. And if the low material level 17 of the fine material bin sends a signal, stopping conveying, starting step S1, and continuing conveying after the storage capacity of the fine material bin 5 meets the condition.
When the pressure measured by the pressure measuring point 20 of the conveying main pipe is greater than 270kPa, the pressure in the conveying pipeline 22 is considered not to meet the conveying condition, the disturbance air door 11 of the conveying main pipe is opened, and the conveying pipeline 22 is compensated through the pressure adjusting pipe 23 connected with the communication main pipe 24. In the process, when the pressure measured by the pressure measuring point 20 of the conveying main pipe is detected to be less than 200kPa, after delaying for 10 seconds, the disturbance air door 11 of the conveying main pipe is closed, and the program automatically executes the previous judgment condition to judge whether the pressure in the conveying pipeline 22 meets the required pressure.
When the pressure of the pressure measuring point 20 of the conveying main pipe is more than 500Kpa, the conveying pipeline 22 is considered to be possibly blocked, and at the moment, the conveying main pipe is automatically dredged through program control:
the mixer inlet door 9 is first closed and the intake air is stopped. And secondly, opening the balance valve 8, performing pressure discharge and air discharge, closing the balance valve 8 and the mixer outlet door 10 after 10 seconds, and finishing the pressure discharge and air discharge. And finally, opening the main conveying pipe disturbance air door 11 for dredging, and judging whether blockage is dredged or not according to pressure data measured by a main conveying pipe pressure measuring point 20 on the conveying pipeline 22. When the pressure of the conveying pipeline is less than 30kPa, the pipeline is considered to be dredged, and the step S1 is continuously executed; when the pressure of the conveying pipeline 22 is greater than 30kPa, after 30s, the conveying main pipe disturbance air door 11 is closed, the mixer outlet door 10 is opened, the balance valve 8 is opened, and then the pressure data is measured. After the circulation is carried out for 5 times, if the pressure of the conveying pipeline 22 is still greater than 30Kpa, system failure is confirmed, the PLC controller sends out a pipe blockage alarm, the system is closed, and a worker waits for overhaul processing.
In the invention, the pressure data value of the conveying pipeline is set according to actual debugging experience, the data in the embodiment cannot represent all equipment, and the technical personnel in the field can set the data according to specific conditions.
In the invention, the sequence of opening and closing the switch for controlling the on-off of the pipeline is not unique, and the switch is determined by a person skilled in the art according to the actual use condition.

Claims (10)

1. The utility model provides a conveying system is selected separately to slag for circulating fluidized bed, includes furnace and big slag bin, big slag bin passes through the slag outlet of lifting machine intercommunication circulating fluidized bed's boiler, its characterized in that: the slag separation and conveying system comprises a slag separation and conveying system, a slag discharge pipeline is communicated with the slag discharge pipeline of the elevator close to the inlet of the large slag bin, a screen is arranged at the inlet of the slag separation pipeline, an outlet of the slag separation and conveying pipeline is communicated with a bin pump, the bin pump is connected with a hearth through a conveying pipeline, an opening and closing adjusting mechanism used for controlling the on-off of the bin pump is arranged on the conveying pipeline, and the slag separation and conveying system further comprises a PLC (programmable logic controller) which is used for controlling the on-off of the.
2. The slag sorting conveyor system of claim 1, wherein: the outlet of the material distribution pipeline is communicated with the bin pump through the fine material bin, the output end of the fine material bin is provided with a dome valve, and the dome valve is connected with the PLC.
3. The slag sorting conveyor system of claim 1, wherein: the opening and closing adjusting mechanism comprises a pneumatic valve assembly connected with the PLC, the pneumatic valve assembly comprises a coal feeding point pneumatic valve arranged on the conveying pipeline, and a mixer outlet door is arranged on a pipeline between the coal feeding point pneumatic valve and the bin pump and close to the bin pump outlet.
4. The slag sorting conveyor system of claim 3, wherein: the bin pump outlet is also connected with a compressed air conveying pipe, and a mixer inlet door is arranged at the position, close to the bin pump outlet, of the compressed air conveying pipe.
5. The slag sorting conveyor system of claim 4, wherein: the mixer inlet door is characterized in that a pressure adjusting pipe is erected in front of an input end of the mixer inlet door and behind an output end of the mixer outlet door in a crossing mode, and a conveying main pipe disturbance air door is arranged on the pressure adjusting pipe.
6. The slag sorting conveyor system of claim 3, wherein: the pneumatic valve assembly further comprises a blanking pneumatic valve arranged on the material distributing pipeline.
7. A method of slag sorting transport using the slag sorting transport system of any one of claims 1 to 6, characterised by the steps of:
s1, starting a blanking pneumatic door on the material distribution pipeline, sorting slag through a screen, transferring the slag to a fine material bin, and starting blanking;
s2, when the storage amount of the slag in the fine aggregate bin meets the requirement, closing a blanking pneumatic valve, opening a dome valve, entering a conveying state, and transferring the slag in the fine aggregate bin to a bin pump;
s3, after the height of the slag in the bin pump reaches a preset position, closing the dome valve and stopping feeding the bin pump;
and S4, opening a coal feeding point pneumatic door and a mixer outlet door on the conveying pipeline, and conveying the slag to the hearth.
8. The method of claim 7, wherein: steps S1, S2, S3 and S4 are all controlled to operate by a PLC controller in which a control program is written using pressure data of the measurement transfer line.
9. The method of claim 8, wherein: when the PLC controller controls the operation of the operation step S4, when the pressure data of the conveying pipeline is larger than 270Kpa, a main conveying pipe disturbance air door is opened, and a pressure adjusting pipe is communicated to carry out pressure compensation on the conveying pipeline; and when the pressure data of the conveying pipeline is less than 200Kpa, closing the conveying main pipe disturbance air door 11 and conveying the slag to the hearth.
10. The method of claim 8, wherein:
the method further comprises the steps of S5, after the slag conveying for the first time in the step S4 is finished, judging the next step by the PLC according to the slag storage amount in the fine aggregate bin, and repeating the steps S2-S4 when the storage amount is enough; when the storage amount is insufficient, step S1 is repeated until the storage amount satisfies the requirement.
CN202010067119.6A 2020-01-20 2020-01-20 Slag sorting and conveying system and sorting and conveying method for circulating fluidized bed Pending CN111156503A (en)

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CN202010067119.6A CN111156503A (en) 2020-01-20 2020-01-20 Slag sorting and conveying system and sorting and conveying method for circulating fluidized bed

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