CN102155736A - Control device for water-coal-slurry burner - Google Patents
Control device for water-coal-slurry burner Download PDFInfo
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- CN102155736A CN102155736A CN2011100838867A CN201110083886A CN102155736A CN 102155736 A CN102155736 A CN 102155736A CN 2011100838867 A CN2011100838867 A CN 2011100838867A CN 201110083886 A CN201110083886 A CN 201110083886A CN 102155736 A CN102155736 A CN 102155736A
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Abstract
The invention relates to a control device for a water-coal-slurry burner. The control device comprises a slurry conveying pump rotating-speed control module, an air output baffle plate control module and an air input baffle plate opening control module, wherein the outside of the slurry conveying pump rotating-speed control module is connected with a heat medium temperature sensor, a slurry amount sensor and an oxygen amount collector I respectively; the outside of the air output baffle plate control module is connected with a deviation module II, an oxygen amount collector II and a deviation module III respectively; and the outside of the air input baffle plate opening control module is connected with a deviation module IV, a differential device and an oxygen amount collector III respectively. The control device has the advantages that: the load regulating range of a boiler is expanded, and different load requirements are met; the realization of an integrated control system is facilitated, the boiler is easy to operate, is convenient to overhaul and runs safely and reliably, the practical user requirements are met, the defects of low manual efficiency, low speed, unreliable full automation and complex overhaul are overcome, and continuous running of the boiler is ensured; and the medium temperature fluctuations of a water-coal-slurry burning boiler are greatly reduced.
Description
Technical field
The present invention relates to the coal water slurry boiler technology, relate in particular to a kind of water coal slurry burner control device.
Background technology
Existing a lot of coal water slurry boiler products exist very big deficiency: at first, can not satisfy the very big production reality needs of load variations; Secondly, the efficient of craft and speed difference and full automatic unreliable and maintenance complexity; At last, produce more impurity in the time of the water-coal-slurry precipitated and separated, influenced the continuous operation of boiler; In addition, the part industry user needs the medium temperature fluctuation of combusting coal water slurry boiler bigger.
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Summary of the invention
At above defective, the invention provides a kind of different load demand, simple to operate that helps satisfying, overhaul convenient, as can to guarantee the continuous operation of boiler water coal slurry burner control device, thus the coal water slurry boiler application demand of industries such as the polyester of realization adjusting parameter vary within wide limits, section.
For achieving the above object, the present invention is by the following technical solutions:
A kind of water coal slurry burner control device, comprise the pump for mortar transmission rotational speed control module, air output baffle controls module and air inducing amount baffle opening control module, described pump for mortar transmission rotational speed control module outside is connected to the heat medium temperature sensor respectively, slurry quantity sensor and oxygen amount collector one, wherein with on the circuit that the heat medium temperature sensor is connected set gradually little modeling piece and deviation module one, described air output baffle controls module-external is connected to deviation module two respectively, oxygen amount collector two and deviation module three, described air output baffle controls module connect air output sensor and oxygen content sensor by comparator in addition; Described air inducing amount baffle opening control module outside is connected to deviation module four, difference engine and oxygen amount collector three respectively.The described slurry quantity sensor outside connects the downscale protection device and is connected with the general election module, between described little modeling piece and the comparator upscale protection device is set.
Compared with prior art, the beneficial effect of water coal slurry burner control device of the present invention is:
(1) helps adding the load regulation range of cauldron, satisfy different workload demands, help realizing that the control optimization of fuel quantity, air output, air inducing amount reaches coal water slurry boiler burning DCS control method;
(2) help the realization of integral control system, make that boiler attendance is simple, maintenance is convenient, safe and reliable to operation, be adapted to actual user's demand, thereby remedied manual efficient and speed difference and full automatic unreliable and overhaul the shortcoming of complexity;
(3) adopt the integrated stirring filter of water-coal-slurry, can effectively prevent the precipitated and separated of water-coal-slurry, filter impurity wherein simultaneously, guarantee the continuous operation of boiler;
(4) adopt technique for temperature compensation, reduced the medium temperature fluctuation of combusting coal water slurry boiler greatly, make coal water slurry boiler can be applicable to industries such as the exigent polyester of temperature stability, section.
Description of drawings
With reference to the accompanying drawings the present invention is described in further detail below.
Fig. 1 is that the structure of the described water coal slurry burner control device of the embodiment of the invention is formed schematic diagram.
Among the figure:
1, heat medium temperature sensor; 2, slurry quantity sensor; 3, air output sensor; 4, oxygen content sensor; 5, little modeling piece; 6, the deviation module one; 7, oxygen amount collector one; 8, downscale protection device; 9, general election module; 10, pump for mortar transmission rotational speed control module; 11, the deviation module two; 12, oxygen amount collector two; 13, air output baffle controls module; 14, comparator; 15, upscale protection device; 16, the deviation module three; 17, the deviation module four; 18, difference engine; 19, air inducing amount baffle opening control module; 20, oxygen amount collector three.
The specific embodiment
As shown in Figure 1, the described water coal slurry burner control device of the embodiment of the invention, comprise pump for mortar transmission rotational speed control module 10, air output baffle controls module 13 and air inducing amount baffle opening control module 19, described pump for mortar transmission rotational speed control module 10 outsides are connected to heat medium temperature sensor 1 respectively, slurry quantity sensor 2 and oxygen amount collector 1, wherein with on the circuit that heat medium temperature sensor 1 is connected set gradually little modeling piece 5 and deviation module 1, described air output baffle controls module 13 outsides are connected to deviation module 2 11 respectively, oxygen amount collector 2 12 and deviation module 3 16, described air output baffle controls module 13 connects air output sensor 3 and oxygen content sensor 4 by comparator 14 in addition; In the above structure, described slurry quantity sensor 2 outsides connect downscale protection device 8 and are connected with general election module 9, between described little modeling piece 5 and the comparator 14 upscale protection device 15 are set; Described air inducing amount baffle opening control module 19 outsides are connected to deviation module 4 17, difference engine 18 and oxygen amount collector 3 20 respectively.
The described water coal slurry burner control device of the above embodiment of the invention, can cooperate fuel quantity RACS that corresponding component is formed respectively, air output RACS and air inducing amount control (combustion chamber draft control) subsystem by pump for mortar transmission rotational speed control module 10, air output baffle controls module 13 and air inducing amount baffle opening control module 19, be embodied in:
(1) fuel quantity RACS: by 2-4 nozzle pump for mortar transmission rotating speed by addition module ask " with ", as total fuel quantity feedback signal, in the deviation module, compare with the combustion rate instruction B0 that sends by the unit load control system, obtain the fuel quantity deviation signal, when system reached stable state, both balanced each other; When producing deviation, pi regulator carries out fuel quantity control according to the deviation size, and the little modeling piece in the system plays fuel quantity, air output intersection restriction; Slurry kind of correction signal is used for eliminating the influence of slurry kind of change to the fuel quantity feedback signal, the fuel-side internal disturbance that the purpose of introducing the drum pressure differential signal produces when being in time to eliminate the gravity flow of nozzle pump for mortar transmission generation water-coal-slurry.The fuel quantity control system adopts the rotating speed of many (one to four) nozzle pump for mortar transmissions of a pi regulator control, when the number of elements that drops into not simultaneously, also different to the requirement of nozzle pump for mortar transmission rotating speed, designed the gain calibration loop for this reason; Automatically adjust loop gain according to dropping into number of elements for the nozzle pump for mortar transmission, the output signal of pi regulator is delivered to four nozzle pump for mortar transmission control loops simultaneously, removes to control abreast the rotating speed of one to four nozzle pump for mortar transmission by control loop, controls fuel quantity equably.
(2) air output RACS: the strategy that oxygen consuming amount is proofreaied and correct the air output feedback signal is adopted in air output control, and the general election module in the air output definite value loop plays fuel quantity, air output intersection restriction; The combustion rate instruction is sent here by the unit load control system, and through the air output set value signal that F (x) is converted to and loads and adapt, during stable state, air output balances each other with the air-supply definite value, and the first and second both sides pressure fan baffle openings are constant, and flue gas oxygen content is an optimum value.During varying duty, the air output adjuster carries out PI control according to the deviation of air output definite value and air output feedback signal, changes the size of air output by the control baffle opening; Because in the varying duty process, fuel quantity and air output all change, therefore the oxygen content in the flue gas is bound to change, when oxygen content departed from the best oxygen value, control action took place in oxygen amount corrective loop, goes to proofread and correct the air output feedback signal with its output valve, again through air output adjuster fine setting pressure fan baffle opening, carry out air output and proofread and correct, finally making excess air is optimum value, guarantees the boiler economical combustion.
(3) air inducing amount control (combustion chamber draft control) subsystem: the control of air inducing amount should make air inducing amount and air output adapt, and keep furnace pressure in the scope that requires, because the degree that adapts of furnace pressure reflection air output and air inducing amount, at air output one regularly, furnace pressure height (combustion chamber draft is low) illustrates the air inducing deficiency, and furnace pressure low (combustion chamber draft height) illustrates that the air inducing amount is excessive; The height of furnace pressure is concerning the safety of boiler operatiopn, and furnace pressure is low, and promptly the combustion chamber draft height makes a large amount of cold wind bleed burner hearth and reduce fire box temperature, and air-introduced machine power consumption increasing and heat loss due to exhaust gas are strengthened; Otherwise, the furnace pressure height, promptly combustion chamber draft is low, when furnace pressure occurring and be higher than atmospheric pressure, the stove cigarette is emerged, and influences environment, even jeopardizes the safety of the equipment and the person.
Generally speaking, combustion process will keep rational wind slurry to cooperate, reasonably primary and secondary air cooperate and rationally give, air inducing cooperates, and also requires the fire box temperature that keeps suitable.Reasonably the wind slurry cooperates the excess air coefficient that will keep best exactly; Reasonably the primary and secondary air cooperation is exactly to guarantee to catch fire rapid, stable and abundant burning; Reasonably give, air inducing cooperates and will keep suitable combustion chamber draft exactly.When operating condition changed, these cooperated control proper, just can reduce combustible loss, improve boiler efficiency.Whether combustion conditions is normal, also tackles flame and observes judgement.During normal smooth combustion, golden yellow flame, the heat color that has light in the stove is stable, flame evenly and be full of the combustion chamber, but the water-cooling wall around not touching, flame kernel is at the middle part, combustion chamber, the flame bottom is not less than half degree of depth of furnace hopper; Ignition point should be in the not far place of distance burner; The water-coal-slurry that do not have in flame segregation, the tangible asterism that also do not have (have asterism represent furnace temperature cross low or the slurry grain too thick).To cause the fluctuation of steam parameter as the combustion process shakiness; Even cause the burner hearth fire-putting-out emergency; Too high or the flame kernel deflection of fire box temperature will cause water-cooling wall and the slagging scorification of furnace outlet heating surface, and may strengthen the thermal deviation of superheater, local overtemperature of tube wall, even booster, so whether whether burning control successfully concerns combustion conditions stable, is the essential condition of monoblock safe and reliable operation.When the designed combustion Process Control System is finished above-mentioned task, select fuel quantity, air output and air inducing amount usually, select boiler load or vapour pressure, flue gas oxygen content or excess air coefficient, combustion chamber draft as controlled volume as controlled quentity controlled variable.
The described water coal slurry burner control device of the above embodiment of the invention, its using method and operation principle are:
1, fuel quantity control system DCS optimizes
(a) this control system is a tandem system, major loop control main vapour pressure, introduce drum pressure as feed-forward signal, subloop is introduced the mean value of the defeated slurry amount of every stage nozzle pump for mortar transmission as feedback signal, and subloop adjuster output has simultaneously added oxygen amount correction signal;
(b) to report to the police be the difference of main vapour pressure and speed governing stage pressure to the difference of major loop, when normally moving the difference of two pressure within the specific limits, undesired if the excessive explanation of difference moves, so will be with the difference of these two amounts as an alarm signal;
(c) calculating of major loop feedforward amount is such, at first is that speed governing stage pressure p1 is divided by main vapour pressure p
TMultiply by the set-point p0 of major loop again, pressure ratio p1/ p
TRepresented effective valve position of steam turbine, p1/ p
TIt is the energy requirement of steam turbine to boiler that p0 represents the energy input of steam turbine, by p1/ p
TThe value that p0 obtains is through two function generator f (x) and f (t), again with drum pressure through the output addition of f (x) function generator as feed-forward signal;
(d) feedback quantity of subloop is a fuel quantity signal, and it is the mean value of many nozzle pump for mortar transmission rotating speeds, also is the outer trace point of major loop, and this mean value is exactly " A " among the figure;
(e) there is a switch subloop centre that outputs to integrator, this switch role in boiler-turbine coordinated is such, when switching value 8 is " 1 ", for stove is followed the machine mode, the signal " a " among the figure is selected in the input of integrator like this, defeated slurry amount is kept main vapour pressure, i.e. main vapour pressure is kept in the change of boiler combustion rate.When switching value 8 was " 0 ", for machine is followed the stove mode, this moment, signal " b " was selected in the input of integrator.Realize defeated slurry amount control under the different coordinated control modes with above-mentioned changing method.When switching value 8 was " 0 ", this control system was by changing the requirement that defeated slurry amount satisfies load command N 0;
(f) the outer trace point of secondary controller PID and integrator be many nozzle pump for mortar transmission speed feedback amounts such as six rotating speed sums divided by 6;
(g) the outer tracking switch of major-minor adjuster, integrator and load controller PID is all relevant with the switching signal in the boiler-turbine coordinated;
(h) the set-point p0 random groups method of operation difference of homophony has different settings, and the load of p0 random groups during the sliding pressure mode and becoming is the polygronal function output of load.It during pressurization methods a fixed value.The method of operation is selected by a switch.
2, air output control system DCS optimizes
(a) air supply control system is a tandem system, major loop is the control of oxygen amount, subloop is total blast control, the output of subloop enters an integrator, and integrator plays the effect that an output partition equilibrium is amplified here, because on-the-spot executing agency is two covers, by an algorithm output, this just need distribute to two executing agencies with the output of a total aperture with an integrator, carries out gain compensation, and integrator its output when operate as normal equals input value substantially;
(b) integrator output is added and subtracted with signal A respectively in two sub-sections mutually, is sent to two pressure fans then.Here the effect of signal A is for two outputs of balance, make total output quantity remain on a steady state value, and two pressure fan baffle openings may be distinguished to some extent, but effect was the same when its total effect and an actuator reached the aperture of general output, and this designs at on-the-spot two executing agencies;
(c) blast adjuster (secondary controller) has been located a switch, its selector switch is a pressure fan height load speed switch, this switching value is to open into amount for the DCS system, it shows that pressure fan operates in higher load condition when being " 1 ", proportional band p1 when then heavy-duty service is selected in switch output, if this opens into amount is " 0 ", then pressure fan operates in low load condition, proportional band p2 when underrun is selected in switch output has realized the automatic switchover of high and low load proportion band like this;
(d) because total wind pressure signal fluctuation is bigger, so this signal has added first order inertial loop to reduce the influence that signal fluctuation brings to output before entering pid algorithm;
(e) always defeated slurry amount adopts the form and the secondary controller output addition of proportion differential, and air output has been controlled the forward feedback correction effect.
3, furnace pressure control system (air inducing amount control system) DCS optimizes
(a) the furnace pressure signal is just often got the mean value of both sides furnace pressure measured value as controlled volume, and both sides furnace pressure deviation surpasses allowed band when unusual, gets the higher value in two measurements.Here earlier two measured values are subtracted, it is that high and low limit difference is reported to the police that difference is reported to the police, and be high the warning when promptly both differences are greater than a certain specified value, and alarm signal be " 1 ", and for hanging down warning, output alarm signal is " 2 " to both differences during less than a certain specified value.The switching signal of switch " 3 " is signal " 1 " and " 2 " or later value, as long as two measure value difference greater than a certain setting value or less than a certain setting value, " 1 " or " 2 " must have a state is 1, and then the state of " 3 " is 1, and at this moment switch is output as the output of general election computing.If there is not difference to report to the police, the state value of " 3 " is 0, and switch is output as the mean value of two measured values, that is to say that controlled volume may be the mean value of two measured values, also may be the big value in two measured values.Here measured value refers to through the signal after the first order inertial loop processing;
(b) furnace pressure is controlled to be single loop control system, and defeated slurry amount adopts the form of proportion differential to be added to as feed-forward signal in the output of adjuster PI algorithm the air inducing amount is proofreaied and correct;
(c) measured value is in order to reduce the influence of signal fluctuation, to make executing agency reduce and fluctuate that executing agency's action is relatively steadily favourable to control appliance safety through the purpose of first order inertial loop processing;
(d) in this system, the variation of high underload time control system is that automatic change ratio is brought realization in the adjuster, there is a switch at furnace pressure adjuster place, its selector switch is an air-introduced machine height load speed switch, this switching value is one to the DCS system and opens into amount, it shows that air-introduced machine operates in higher load condition when being " 1 ", the proportional band k1 when then heavy-duty service is selected in switch output.If this opens into amount is " 0 ".Then air-introduced machine operates in low load condition, the proportional band k2 when underrun is selected in switch output, the automatic switchover of proportional band when so just having realized high and low the load.
Claims (1)
1. water coal slurry burner control device, comprise pump for mortar transmission rotational speed control module (10), air output baffle controls module (13) and air inducing amount baffle opening control module (19), it is characterized in that: described pump for mortar transmission rotational speed control module (10) outside is connected to heat medium temperature sensor (1) respectively, slurry quantity sensor (2) and oxygen amount collector one (7), wherein with on the circuit that heat medium temperature sensor (1) is connected set gradually little modeling piece (5) and deviation module one (6), described air output baffle controls module (13) outside is connected to deviation module two (11) respectively, oxygen amount collector two (12) and deviation module three (16), described air output baffle controls module (13) connect air output sensor (3) and oxygen content sensor (4) by comparator (14) in addition; Described air inducing amount baffle opening control module (19) outside is connected to deviation module four (17), difference engine (18) and oxygen amount collector three (20) respectively; Described slurry quantity sensor (2) outside connects downscale protection device (8) and is connected with general election module (9), between little modeling piece (5) and the comparator (14) upscale protection device (15) is set.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100838867A CN102155736A (en) | 2011-04-05 | 2011-04-05 | Control device for water-coal-slurry burner |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100838867A CN102155736A (en) | 2011-04-05 | 2011-04-05 | Control device for water-coal-slurry burner |
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| CN2011100838867A Pending CN102155736A (en) | 2011-04-05 | 2011-04-05 | Control device for water-coal-slurry burner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111503655A (en) * | 2020-03-17 | 2020-08-07 | 山东电力工程咨询院有限公司 | Combustion control method and system based on smoke multi-component detection |
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| CN101029737A (en) * | 2006-03-17 | 2007-09-05 | 广州迪森热能设备有限公司 | Petroleum coking-slurry burning control system |
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| CN201462782U (en) * | 2009-05-13 | 2010-05-12 | 张兴法 | Energy saving control system for steam boiler |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH11218326A (en) * | 1998-01-30 | 1999-08-10 | Gastar Corp | Combution equipment |
| CN1553078A (en) * | 2003-05-26 | 2004-12-08 | 邓立新 | Boosting slurry-supply system for combusting water coal slurry |
| CN101029737A (en) * | 2006-03-17 | 2007-09-05 | 广州迪森热能设备有限公司 | Petroleum coking-slurry burning control system |
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| CN111503655A (en) * | 2020-03-17 | 2020-08-07 | 山东电力工程咨询院有限公司 | Combustion control method and system based on smoke multi-component detection |
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Application publication date: 20110817 |