CN208566744U - A kind of First air low-voltage variation system for pulverized-coal fired boiler - Google Patents
A kind of First air low-voltage variation system for pulverized-coal fired boiler Download PDFInfo
- Publication number
- CN208566744U CN208566744U CN201820440710.XU CN201820440710U CN208566744U CN 208566744 U CN208566744 U CN 208566744U CN 201820440710 U CN201820440710 U CN 201820440710U CN 208566744 U CN208566744 U CN 208566744U
- Authority
- CN
- China
- Prior art keywords
- coal pulverizer
- group
- coal
- sequence
- oil gun
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Disintegrating Or Milling (AREA)
Abstract
The utility model provides a kind of First air low-voltage variation system, and system includes detection unit, for detecting the real-time pressure of First air main pipe；First control unit, the real-time pressure for will test is compared with preset pressure, when real-time pressure is lower than preset pressure, after postponing preset time period, disconnects the power supply of two coal pulverizers under current state on priority sequence；It is by way of delay cut-off stage by stage; so that when First air forces down triggering; coal pulverizer and oil gun are selectively gradually powered off according to preset priority sequence; reduce unit unplanned outage, ensure that boiler combustion is stablized, will not influence the operation of other equipment; it ensure that coal pulverizer reliability of operation; to realize the First air low-voltage variation of pulverized-coal fired boiler, the boiler extinguishment stoppage in transit accident triggered due to low-voltage variation is avoided, ensure that stabilization of equipment performance when the interim low pressure of First air.
Description
Technical field
The utility model relates to pulverized-coal fired boiler safety features technical fields, are used for pulverized-coal fired boiler more particularly, to one kind
First air low-voltage variation system.
Background technique
The main function of large coal powder boiler First air is that coal dust in coal-grinding machine drum body is sent into hearth combustion, in order to guarantee
The design of flameholding system once protect by wind pressure minimum living.At present large coal powder boiler be typically designed to go with each other all the time, First air just
Pressure unit pulverized-coal system is typically provided six coal pulverizers, two primary air fans by taking 600MW boiler as an example.Under normal circumstances,
Two primary air fan operations, maintain 8~9Kpa of First air main-piping pressure, and the operation of separate unit primary air fan can receive 60% load
(360MW), in actual motion, steady combustion when combustion-supporting and boiler operatiopn of the oil gun for coal pulverizer initial start stage is unstable, normally
Do not put into operation oil gun when operation；Every coal pulverizer can on-load be about 18%, prior to starting the coal pulverizer of two sides and its corresponding
Oil gun, (four coal pulverizer maximums can on-load at this time for two intermediate coal pulverizers of starting and its corresponding oil gun when undercapacity
About 70%), start innermost two coal pulverizers and its corresponding oil gun (six coal pulverizer maximums at this time when power output is or else sufficient
Can on-load be 100%).
The main function of primary air fan is that the coal dust in coal-grinding machine drum body is sent into furnace chamber inner combustion, it requires First air
It is pressed in reasonable range, when primary wind pressure is reduced to the resistance for being not enough to overcome pulverized coal preparation system, is sent into coal in burner hearth at this time
Detonation operating condition can occur in furnace for powder air-flow fluctuation.For the generation for preventing such operating condition, system is commonly designed once low pressure
Protective module triggers running all coal pulverizers and powers off shutdown simultaneously, to prevent in furnace when primary wind pressure is lower than setting value
Detonation operating condition occurs, while related oil gun interlocking puts into operation unit with underrun.
But when using this method low-voltage variation being triggered, coal dust will lead to since all coal pulverizers are top simultaneously
Fuel loses, and causes boiler extinguishment stoppage in transit or fault spread, causes unit unplanned outage or equipment damage.Therefore it provides
A kind of First air low-voltage variation system for pulverized-coal fired boiler, to avoid the boiler extinguishment stoppage in transit thing triggered due to low-voltage variation
Therefore stabilization of equipment performance when guaranteeing the interim low pressure of First air, just become those skilled in the art's urgent problem to be solved.
Utility model content
The purpose of the utility model is to provide a kind of First air low-voltage variation system for pulverized-coal fired boiler, to avoid due to
Low-voltage variation and the boiler extinguishment stoppage in transit accident triggered guarantee stabilization of equipment performance when the interim low pressure of First air.
In order to solve the above-mentioned technical problem, the utility model provides a kind of First air low-voltage variation system for pulverized-coal fired boiler
System, comprising:
Detection unit, for detecting the real-time pressure of First air main pipe；
First control unit, the real-time pressure for will test is compared with preset pressure, when real-time pressure is lower than pre-
If when pressure, after postponing preset time period, disconnecting the power supply of two coal pulverizers under current state on priority sequence；
The preset time period is multiple periods, after postponing each preset time period, is disconnected in default with this
The power supply of two coal pulverizers on period corresponding priority sequence, until all coal pulverizers are closed.
Further, further includes:
First judging unit, for judging the working condition of each coal pulverizer, according to the current working status of each coal pulverizer
Judge the priority sequence of coal pulverizer.
Further, further includes:
Second control unit, the real-time pressure for will test is compared with preset pressure, when real-time pressure is lower than pre-
If when pressure, after postponing preset time period, disconnecting the power supply of two oil guns under current state on priority sequence；
The preset time period is multiple periods, after postponing each preset time period, is disconnected in default with this
The power supply of two oil guns on period corresponding priority sequence, until all oil guns are closed.
Further, further includes:
Second judgment unit, for judging the working condition of each oil gun, to be sentenced according to the current working status of each oil gun
The priority sequence of oil-break rifle.
Further, the quantity of the coal pulverizer is six, and six coal pulverizers are divided into first group of coal pulverizer and second
Group coal pulverizer, first group of coal pulverizer include priority successively reduce first group of First ray coal pulverizer, first group second
Sequence coal pulverizer and first group of third sequence coal pulverizer, second group of coal pulverizer include second group that priority successively reduces
One sequence coal pulverizer, second group of second sequence coal pulverizer and second group of third sequence coal pulverizer；
The quantity of the oil gun is six, and six oil guns are divided into first group of oil gun and second group of oil gun, described first
Group oil gun includes first group of First ray oil gun, first group of second sequence oil gun and the first group of third sequence that priority successively reduces
Column oil gun, second group of oil gun include second group of First ray oil gun, the second group of second sequence oil that priority successively reduces
Rifle and second group of third sequence oil gun；
When the real-time pressure that the detection unit detects is lower than preset pressure, disconnected after postponing the first preset time period
The power supply of first group of First ray coal pulverizer and second group of First ray coal pulverizer continues to postpone the second preset time
The power supply that first group of second sequence coal pulverizer and second group of second sequence coal pulverizer are disconnected after section continues to postpone third
The power supply of first group of third sequence coal pulverizer and second group of third sequence coal pulverizer is disconnected after preset time period；
It has no progeny in delay preset time, if the coal pulverizer that should currently power off is in off working state, according to priority drops
Sequence disconnects it with the coal pulverizer for organizing next sequence；
When the real-time pressure that the detection unit detects is lower than preset pressure, after postponing first preset time period
The power supply for disconnecting first group of First ray oil gun and second group of First ray oil gun continues to postpone the second preset time
It is default to continue delay third for the power supply that first group of second sequence oil gun and second group of second sequence oil gun are disconnected after section
The power supply of first group of third sequence oil gun and second group of third sequence oil gun is disconnected after period；
It has no progeny in delay preset time, if the oil gun that should currently power off is in off working state, according to priority descending
It is disconnected with the oil gun for organizing next sequence.
Detailed description of the invention
It, below will be to specific embodiment or the prior art in order to illustrate more clearly of specific embodiment of the present invention
Attached drawing needed in description is briefly described, it should be apparent that, the accompanying drawings in the following description is the utility model
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is the structural schematic diagram of the protection system provided in a kind of specific embodiment of the utility model；
Fig. 2 is the forming circuit of primary wind pressure low signal；
Fig. 3 is 2 kinds of special circumstances of four coal pulverizers operation；
Fig. 4 is the trip(ping) circuit of C coal pulverizer；
Fig. 5 is the trip(ping) circuit of B coal pulverizer；
Fig. 6 is the trip(ping) circuit of A coal pulverizer；
Fig. 7 is the trip(ping) circuit of F coal pulverizer；
Fig. 8 is the trip(ping) circuit of E coal pulverizer；
Fig. 9 is the trip(ping) circuit of D coal pulverizer.
Specific embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with attached drawing, it is clear that described
Embodiment is the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, originally
Field those of ordinary skill every other embodiment obtained without making creative work belongs to practical
Novel protected range.
In a specific embodiment, the utility model provides a kind of First air low-voltage variation system for pulverized-coal fired boiler
System, comprising:
Detection unit, for detecting the real-time pressure of First air main pipe；
First control unit, the real-time pressure for will test is compared with preset pressure, when real-time pressure is lower than pre-
If when pressure, after postponing preset time period, disconnecting the power supply of two coal pulverizers under current state on priority sequence；
The preset time period is multiple periods, after postponing each preset time period, is disconnected in default with this
The power supply of two coal pulverizers on period corresponding priority sequence, until all coal pulverizers are closed.
During the work time, when there is the real-time pressure in First air main pipe lower than preset pressure, then according to coal pulverizer
Quantity determine the coal pulverizer quantity and precedence number of power-off simultaneously, i.e., when pressure is lower than preset pressure, from front to back
(i.e. the sequence of priority reduction) successively judges whether the coal pulverizer in each priority is in running order, if being in work shape
State then powers off the coal pulverizer, is such as in off working state, i.e., to the first job shape in the subsequent priority of the coal pulverizer
The coal pulverizer of state is powered off.
Above-mentioned protection system further includes the first judging unit, which is used to judge the work shape of each coal pulverizer
State, to judge the priority sequence of coal pulverizer according to the current working status of each coal pulverizer.
Power down sequence in addition to controlling coal pulverizer, in order to further increase stabilization of equipment performance, which can also be wrapped
Include the module for time-delay closing oil gun.Specifically, which also wraps:
Second control unit, the real-time pressure for will test is compared with preset pressure, when real-time pressure is lower than pre-
If when pressure, after postponing preset time period, disconnecting the power supply of two oil guns under current state on priority sequence；
The preset time period is multiple periods, after postponing each preset time period, is disconnected in default with this
The power supply of two oil guns on period corresponding priority sequence, until all oil guns are closed；
Second judgment unit, for judging the working condition of each oil gun, to be sentenced according to the current working status of each oil gun
The priority sequence of oil-break rifle.
In above-mentioned specific embodiment, by taking the equipment of corresponding six oil guns of six coal pulverizers as an example, the coal pulverizer
Quantity is six, and six coal pulverizers are divided into first group of coal pulverizer and second group of coal pulverizer, and first group of coal pulverizer includes
First group of First ray coal pulverizer, first group of second sequence coal pulverizer and the first group of third sequence coal-grinding that priority successively reduces
Machine, second group of coal pulverizer include second group of First ray coal pulverizer, the second group of second sequence mill that priority successively reduces
Coal machine and second group of third sequence coal pulverizer；
The quantity of the oil gun is six, and six oil guns are divided into first group of oil gun and second group of oil gun, described first
Group oil gun includes first group of First ray oil gun, first group of second sequence oil gun and the first group of third sequence that priority successively reduces
Column oil gun, second group of oil gun include second group of First ray oil gun, the second group of second sequence oil that priority successively reduces
Rifle and second group of third sequence oil gun；
When the real-time pressure that the detection unit detects is lower than preset pressure, disconnected after postponing the first preset time period
The power supply of first group of First ray coal pulverizer and second group of First ray coal pulverizer continues to postpone the second preset time
The power supply that first group of second sequence coal pulverizer and second group of second sequence coal pulverizer are disconnected after section continues to postpone third
The power supply of first group of third sequence coal pulverizer and second group of third sequence coal pulverizer is disconnected after preset time period；
It has no progeny in delay preset time, if the coal pulverizer that should currently power off is in off working state, according to priority drops
Sequence disconnects it with the coal pulverizer for organizing next sequence；
When the real-time pressure that the detection unit detects is lower than preset pressure, after postponing first preset time period
The power supply for disconnecting first group of First ray oil gun and second group of First ray oil gun continues to postpone the second preset time
It is default to continue delay third for the power supply that first group of second sequence oil gun and second group of second sequence oil gun are disconnected after section
The power supply of first group of third sequence oil gun and second group of third sequence oil gun is disconnected after period；
It has no progeny in delay preset time, if the oil gun that should currently power off is in off working state, according to priority descending
It is disconnected with the oil gun for organizing next sequence.
Specifically, the preset pressure in above-mentioned First air main pipe is 6KPa, and the first preset time period is 15 seconds, and second is default
Period is 45 seconds, and third preset time period is 75 seconds.
Protection system provided by the utility model is by way of delay cut-off stage by stage, so that when First air forces down touching
When hair, coal pulverizer and oil gun are selectively gradually powered off according to preset priority sequence, reduce unit unplanned outage, are protected
It has demonstrate,proved boiler combustion to stablize, will not influence the operation of other equipment, ensure that coal pulverizer reliability of operation, to realize coal
The First air low-voltage variation of powder boiler, avoids the boiler extinguishment stoppage in transit accident triggered due to low-voltage variation, ensure that primary
Stabilization of equipment performance when the interim low pressure of wind.
1-9 with reference to the accompanying drawing, and the equipment based on six coal pulverizers, six oil guns carry out above-mentioned specific embodiment
Supplementary explanation in circuit theory.
Fig. 1 is the schematic diagram of typical 600MW large coal powder boiler at present, is typically designed to go with each other all the time, First air
Pressurized direct pulverizing coal system, 600MW boiler are typically provided six coal pulverizers, two primary air fans, under normal circumstances, two one
Secondary fan operation, maintains 8~9Kpa of First air main-piping pressure, and the operation of separate unit primary air fan can receive 60% load (360MW).
In actual motion, steady combustion when combustion-supporting and boiler operatiopn of the oil gun for coal pulverizer initial start stage is unstable, when normal operation not
Put into operation oil gun；Every coal pulverizer can on-load be about 18%, prior to starting A, F coal pulverizer and its corresponding oil gun, power output is not
Start B, E coal pulverizer and its corresponding oil gun (at this time four coal pulverizer maximums can on-load be about 70%) when sufficient, power output is or else
Start C, D coal pulverizer and its corresponding oil gun (at this time six coal pulverizer maximums can on-load be 100%) when sufficient.
Fig. 2 is the forming circuit of primary wind pressure low signal, when the First air main pipe real-time pressure detected is less than default pressure
When power, then primary wind pressure low signal triggers, and be delayed 15 seconds, 45 seconds, 75 seconds generation coal pulverizer trip commands respectively, send to jump coal-grinding
The logic judgment circuit of machine, instruction are sent out in the form of 5 pulse per second (PPS)s.In Fig. 2, " XQ01 " of the first row is to represent " primary wind pressure "
Analog signals, it is the real-time First air main-piping pressure of actual measurement, and current being constantly changed, can reflect
First air actual pressure, our task seeks to be kept for its moment not less than 6KPa, once it is triggered lower than 6KPa
" First air forces down " signal and be delayed respectively 15 seconds, 45 seconds, 75 seconds generation coal pulverizer trip commands, starting coal pulverizer tripping
Logic judgment circuit.It is followed by a comparison block, in which: " SWITCH=0 " means " being less than ", and " GW=6 " is meant
" 6KPa ", when " X=XQ01 " of input is less than 6Kpa, " comparison block " output on-off model " 1 " simultaneously forms XH01 signal,
The meaning of XH01 signal is exactly " primary wind pressure is less than 6Kpa "；Three positive delay blocks are followed by, if " primary wind pressure is less than
The time of 6Kpa " signal is greater than the time of delay block setting, and output will be set as 1, and otherwise its output is 0, and three just
It is respectively 15 seconds, 45 seconds, 75 seconds to the delay time of delay block；Followed by three 5 seconds pulse packets, if positive delay block
Output is 1, and output will be set as 1 and be kept for 5 seconds, and otherwise its output is 0.In this way, after First air forces down, Jiu Huifen
Not Yan Shi 15 seconds, 45 seconds, 75 seconds and respectively generate three instructions P15, P45, P75, and send to coal pulverizer tripping logic judgment
Circuit, the instruction are sent out in the form of 5 pulse per second (PPS)s.
Fig. 3 is two kinds of special circumstances of four coal pulverizers operation, it may be assumed that the first special circumstances of four mill operations are as follows: ABC
With any operation of D/E/F, second of special circumstances of four mill operations are as follows: any operation of DEF and A/B/C.It is counter to prolong
When block, the time of anti-delay is set as 10s, it is therefore an objective to keep the signal again 10 seconds, avoid the problem that causing to patrol because of execution cycle
Collect error (effect of " anti-delay block " is identical in each figure below).Wherein, " 4PULV 1ABC&D/E/F " means " 4 in Fig. 3
Platform coal pulverizer operation (A, B, C coal pulverizer are all run, and D, E, F coal pulverizer have an operation) "；"4PULV 2DEF&A/B/C"
Mean " 4 coal pulverizer operations (D, E, F coal pulverizer are all run, and A, B, C coal pulverizer have an operation) "；"4PULV
OP " mean " 2 kinds of special circumstances of 4 coal pulverizers operation (point 2 kinds of situations, one is: A, B, C coal pulverizer all operation and
D, E, F coal pulverizer have an operation, the second is: D, E, F coal pulverizer are all run and A, B, C coal pulverizer have an operation) ".
Attached drawing 4 is the trip(ping) circuit of C coal pulverizer in Fig. 1, and which illustrate the conditions of triggering C coal pulverizer tripping: in mill operation,
When the real-time pressure of First air is less than preset pressure, jump C mill after 15s delay, four mills run above-mentioned second of special circumstances:
When DEF and A/B/C is run, DE mill has been jumped after 15s delay, F and A/B/C has been jumped after 45s delay and grind；Four mill operations first
When kind special circumstances, ABC and D/E/F are run, BC mill is jumped after 15s delay.
In Fig. 4, " TRIP C " (that is: the XV21 signal) at end represents " signal of triggering No. 3 coal pulverizer C tripping "；"or"
3 inputs of door are to form 3 conditions of the signal:
" 4PULV OP " mean " 2 kinds of special circumstances of 4 coal pulverizers operation (point 2 kinds of situations, one is: A, B, C
Coal pulverizer is all run and D, E, F coal pulverizer have an operation, the second is: D, E, F coal pulverizer are all run and A, B, C coal pulverizer
Have an operation) "；Thereafter " o " means logic " NOT gate "；When not being this two kinds of situations, occur " First air forces down "
Afterwards, if primary wind pressure is still low after delay 15 seconds, No. 3 coal pulverizer C trippings are triggered.
In " TRIP A/B/C " signal, " 4PULV 2DEF&A/B/C " means that " 4 coal pulverizers run (D, E, F coal-grinding
Machine is all run, and A, B, C coal pulverizer have an operation) ", P45 means " after First air forces down, being delayed 45 seconds ", it may be assumed that has
Operation (D, E, F coal pulverizer are all run, and A, B, C coal pulverizer have an operation), generation First air forces down to be prolonged 4 coal pulverizers
When 45 seconds after primary wind pressure it is still low, then according to No. 3 coal pulverizer C of set sequence trigger switch tripping, No. 2 coal pulverizer B trippings, No. 1 coal-grindings
Machine A tripping.
In " TRIP CB " signal, " 4PULV 1ABC&D/E/F " means that " 4 coal pulverizers run (A, B, C coal pulverizer
All operation, and D, E, F coal pulverizer have an operation) ", after First air forces down, be delayed 15 seconds after primary wind pressure it is still low, then according to
No. 3 coal pulverizer C trippings of set sequence trigger switch, No. 2 coal pulverizer B trippings.
Attached drawing 5 is the trip(ping) circuit of B coal pulverizer in Fig. 1, and which illustrate the conditions of triggering B coal pulverizer tripping: C mill is not transported
Row, First air force down, and jump B mill after 15s delay；In mill operation, First air is forced down, and jumps B mill after 45s delay；Four mill fortune
The 2nd kind of special circumstances of row: when DEF and A/B/C is run, DE mill has been jumped after 15s delay, to have jumped F and A/B/C after 45s delay
Mill；Four mills run the 1st kind of special circumstances: when ABC and D/E/F is run, BC mill is jumped after 15s delay.
In Fig. 5, " TRIP B " (that is: the XV22 signal) at end represents " signal of triggering No. 2 coal pulverizer B tripping "；"or"
3 inputs of door are to form 3 conditions of the signal:
" 4PULV OP " mean " 2 kinds of special circumstances of 4 coal pulverizers operation (point 2 kinds of situations, one is: A, B, C
Coal pulverizer is all run and D, E, F coal pulverizer have an operation, the second is: D, E, F coal pulverizer are all run and A, B, C coal pulverizer
Have an operation) "；Thereafter " o " means " NOT gate "." PULV C OP " means " coal pulverizer C operation "；Thereafter
" o " means " NOT gate ".P15 means " after First air forces down, being delayed 15 seconds ".P45 means that " First air forces down
Afterwards, it is delayed 45 seconds ".The logic means that when not being this two kinds of situations, then occurs after First air forces down, if coal pulverizer C
Not running, primary wind pressure is still low after delay 15 seconds, triggers No. 2 coal pulverizer B trippings；After generation First air forces down, if delay 45
Primary wind pressure is still low (at this point, No. 3 coal pulverizer C not running) after second, also to trigger No. 2 coal pulverizer B trippings.
In " TRIP A/B/C " signal, " 4PULV 2DEF&A/B/C " means that " 4 coal pulverizers run (D, E, F coal-grinding
Machine is all run, and A, B, C coal pulverizer have an operation) ", P45 means " after First air forces down, being delayed 45 seconds ", it may be assumed that has
4 coal pulverizers then occur First air and force down operation (D, E, F coal pulverizer are all run, and A, B, C coal pulverizer have an operation)
Primary wind pressure is still low after delay 45 seconds, then triggers No. 3 coal pulverizer C trippings, No. 2 coal pulverizer B trippings, No. 1 coal pulverizer A tripping.
In " TRIP CB " signal, " 4PULV 1ABC&D/E/F " means that " 4 coal pulverizers run (A, B, C coal pulverizer
All operations, and D, E, F coal pulverizer have an operation) ", after First air forces down, primary wind pressure is still low after delay 15 seconds, then triggers
No. 3 coal pulverizer C trippings, No. 2 coal pulverizer B trippings.
Attached drawing 6 is the trip(ping) circuit of A coal pulverizer, and which illustrate the conditions of triggering A coal pulverizer tripping: BC mill all not running, one
Secondary wind pressure is low, jumps A mill after 15s delay；B grinds not running, and First air forces down, and jumps A mill after 45s delay；In mill operation, once
Wind pressure is low, jumps A mill after 75s delay；Four mills run the 1st kind of special circumstances: when ABC and D/E/F is run, after 15s delay
It jumps BC mill, to jump A and D/E/F after 45s delay and grind；Four mills run the 2nd kind of special circumstances: when DEF and A/B/C is run,
DE mill has been jumped after 15s delay, to be jumped F and A/B/C after 45s delay and be ground.
In Fig. 6, " TRIP A " (that is: the XV23 signal) at end represents " signal of triggering No. 1 coal pulverizer A tripping "；End
2 of OR-gate inputs be to form 2 conditions of the signal: " 4PULV OP " means " 2 kinds of 4 coal pulverizers operation
Special circumstances (point 2 kinds of situations, one is: A, B, C coal pulverizer are all run and D, E, F coal pulverizer have an operation, the second is:
D, E, F coal pulverizer are all run and A, B, C coal pulverizer have an operation) "；Thereafter " o " means " NOT gate "."PULV C
OP " means " coal pulverizer C operation "；Thereafter " o " means " NOT gate "." PULV B IN OP " means " coal-grinding
Machine B is being run "；Thereafter " o " means " NOT gate ".P15 means " after First air forces down, being delayed 15 seconds ".The meaning of P45
Think of is " after First air forces down, being delayed 45 seconds ".P75 means " after First air forces down, being delayed 75 seconds ".The meaning of the logic
It is: when not being this two kinds of situations, then occurs after First air forces down, if coal pulverizer C not running and coal pulverizer B not running, prolong
When 15 seconds after primary wind pressure it is still low, trigger No. 1 coal pulverizer A tripping；After generation First air forces down, if First air after delay 45 seconds
It presses still low (at this point, No. 3 coal pulverizer C not running and No. 2 coal pulverizer B not running), also to trigger No. 1 coal pulverizer A tripping；Occur
After First air forces down, if primary wind pressure is still low after delay 75 seconds, No. 1 coal pulverizer A tripping is also triggered.
In " TRIP A/B/C " signal, " 4PULV 2DEF&A/B/C " means that " 4 coal pulverizers run (D, E, F coal-grinding
Machine is all run, and A, B, C coal pulverizer have an operation) ", P45 means " after First air forces down, being delayed 45 seconds ", it may be assumed that has
4 coal pulverizers then occur First air and force down operation (D, E, F coal pulverizer are all run, and A, B, C coal pulverizer have an operation)
Primary wind pressure is still low after delay 45 seconds, then triggers No. 3 coal pulverizer C trippings, No. 2 coal pulverizer B trippings, No. 1 coal pulverizer A tripping.
Attached drawing 7 is F coal pulverizer trip(ping) circuit in Fig. 1, and which illustrate the conditions of triggering F coal pulverizer tripping: DE mill is not all transported
Row, First air force down, and jump F mill after 15s delay；E grinds not running, and First air forces down, and jumps F mill after 45s delay；Mill operation
In, First air forces down, and jumps F mill after 75s delay；Four mills run the 1st kind of special circumstances: when ABC and D/E/F is run, 15s prolongs
Shi Houyi jumps BC mill, to jump A and D/E/F after 45s delay and grind；Four mills run the 2nd kind of special circumstances: DEF and A/B/C is transported
When row, DE mill has been jumped after 15s delay, F and A/B/C has been jumped after 45s delay and grind.
Attached drawing 8 is E coal pulverizer trip(ping) circuit in Fig. 1, and which illustrate the conditions of triggering E coal pulverizer tripping: D grinds not running,
First air forces down, and jumps E mill after 15s delay；In mill operation, First air is forced down, and jumps E mill after 45s delay；Four mills operation the
1 kind of special circumstances: when ABC and D/E/F is run, BC mill has been jumped after 15s delay, A and D/E/F has been jumped after 45s delay and grind；Four
Platform mill the 2nd kind of special circumstances of operation: when DEF and A/B/C is run, DE mill is jumped after 15s delay.
Attached drawing 9 is D coal pulverizer trip(ping) circuit in Fig. 1, and which illustrate the conditions of triggering D coal pulverizer tripping: in mill operation, one
Secondary wind pressure is low, jumps D mill after 15s delay；Four mills run the 1st kind of special circumstances: when ABC and D/E/F is run, after 15s delay
BC mill has been jumped, A and D/E/F has been jumped after 45s delay and grind；Four mills run the 2nd kind of special circumstances: DEF and A/B/C is run
When, DE mill is jumped after 15s delay.
Although the embodiments of the present invention have been shown and described above, it is to be understood that above-described embodiment is
Illustratively, it should not be understood as limiting the present invention, those skilled in the art are in the scope of the utility model
Inside it can make changes, modifications, alterations, and variations to the above described embodiments.
Claims (5)
1. a kind of First air low-voltage variation system for pulverized-coal fired boiler characterized by comprising
Detection unit, for detecting the real-time pressure of First air main pipe；
First control unit, the real-time pressure for will test are preset multiple periods compared with preset pressure, and
Disconnect the power supply of two coal pulverizers under current state on priority sequence；
First judging unit, for judging the priority sequence of the coal pulverizer.
2. First air low-voltage variation system according to claim 1, which is characterized in that first judging unit is used for
The priority sequence of coal pulverizer is judged according to the current working status of the coal pulverizer.
3. First air low-voltage variation system according to claim 2, which is characterized in that further include:
Second control unit, for the real-time pressure for will test compared with preset pressure, preset time period is multiple times
Section, and disconnect the power supply of two oil guns under current state on priority sequence.
4. First air low-voltage variation system according to claim 3, which is characterized in that further include:
Second judgment unit, for judging the priority sequence of oil gun according to the current working status of the oil gun.
5. First air low-voltage variation system according to claim 4, which is characterized in that the quantity of the coal pulverizer is six
A, six coal pulverizers are divided into first group of coal pulverizer and second group of coal pulverizer, first group of coal pulverizer include priority according to
First group of First ray coal pulverizer, first group of second sequence coal pulverizer and the first group of third sequence coal pulverizer of secondary reduction, it is described
Second group of coal pulverizer includes second group of First ray coal pulverizer, the second group of second sequence coal pulverizer and that priority successively reduces
Two groups of third sequence coal pulverizers；
The quantity of the oil gun is six, and six oil guns are divided into first group of oil gun and second group of oil gun, first group of oil
Rifle includes first group of First ray oil gun, first group of second sequence oil gun and the first group of third sequence oil that priority successively reduces
Rifle, second group of oil gun include priority successively reduce second group of First ray oil gun, second group of second sequence oil gun and
Second group of third sequence oil gun.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820440710.XU CN208566744U (en) | 2018-03-30 | 2018-03-30 | A kind of First air low-voltage variation system for pulverized-coal fired boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820440710.XU CN208566744U (en) | 2018-03-30 | 2018-03-30 | A kind of First air low-voltage variation system for pulverized-coal fired boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208566744U true CN208566744U (en) | 2019-03-01 |
Family
ID=65453845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820440710.XU Expired - Fee Related CN208566744U (en) | 2018-03-30 | 2018-03-30 | A kind of First air low-voltage variation system for pulverized-coal fired boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208566744U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108644804A (en) * | 2018-03-30 | 2018-10-12 | 大唐阳城发电有限责任公司 | It is a kind of for the First air low-voltage variation system of pulverized-coal fired boiler and guard method |
-
2018
- 2018-03-30 CN CN201820440710.XU patent/CN208566744U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108644804A (en) * | 2018-03-30 | 2018-10-12 | 大唐阳城发电有限责任公司 | It is a kind of for the First air low-voltage variation system of pulverized-coal fired boiler and guard method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102226513B (en) | Fault optimizing control method of supercritical unit unilateral auxiliary engine | |
| CN104633638A (en) | Comprehensive control method for function of machine halt without boiler shutdown in power plant FCB | |
| CN110017498B (en) | Starting mode of direct-blowing pulverizing system | |
| CN111555372A (en) | Variable-rate energy storage auxiliary power plant AGC frequency modulation control method | |
| CN208566744U (en) | A kind of First air low-voltage variation system for pulverized-coal fired boiler | |
| CN102591201A (en) | Control method of integral saturation resistance in auxiliary machine failure load reduction process | |
| CN104197367B (en) | Primary air fan RB optimal control method based on mother tube pressure | |
| CN110360592A (en) | The disconnected coal control method of coal pulverizer under three operation of coal pulverizing mills of underload | |
| CN111981459A (en) | Optimization control method of multi-fuel co-combustion coal-fired unit under RB working condition | |
| CN107132758B (en) | Operation method of induced draft fan PID controller feedforward logic optimization configuration control system | |
| CN108644804A (en) | It is a kind of for the First air low-voltage variation system of pulverized-coal fired boiler and guard method | |
| CN116382200A (en) | Full-load self-stabilization system of unit and operation method thereof | |
| US4398141A (en) | Static VAR generators | |
| CN112657665B (en) | Control method for preventing and coping with fan stall in RB process | |
| CN105116765A (en) | Plasma automatic arc starting control system and method with multiple control functions | |
| CN110296386B (en) | Fuel control method under FCB working condition of coal-fired unit for mixed combustion of coal gas | |
| CN107238102A (en) | A kind of primary air fan RB control methods under full load mode | |
| CN210430932U (en) | Low-voltage ride-through device for coal feeder in power plant | |
| CN113477389B (en) | Control method and device of pulverizing system | |
| CN217940447U (en) | Auxiliary engine tripping control system for low-load working condition of thermal power plant | |
| CN102003378A (en) | Novel start control circuit for double-winding compressor | |
| CN206055674U (en) | A kind of 400,000 kilocalorie above combustors | |
| CN112963859A (en) | Boiler critical flame protection misoperation prevention regulation and control system | |
| CN106678787B (en) | Banking fire guard method and system | |
| JP2008148369A (en) | Secondary battery pack with simple overcharge protective function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190301 Termination date: 20200330 |