CN1699227A

CN1699227A - Small perturbation reversal control method for kiln furnace

Info

Publication number: CN1699227A
Application number: CNA2005100426912A
Authority: CN
Inventors: 高秋孝
Original assignee: Irico Group Electronics Co Ltd
Current assignee: Irico Group Electronics Co Ltd
Priority date: 2005-05-23
Filing date: 2005-05-23
Publication date: 2005-11-23
Anticipated expiration: 2025-05-23
Also published as: CN100378016C

Abstract

Disclosed is a small perturbation reversal control method for kiln furnace which comprises determining the real requirement of the kiln manufacturing process and burning behavior, during the procedure of fire change which is less than 35 seconds, pre-treating the fuel and the proportion of combustion air quantity, during the procedure from natural gas cut-off to opening, increasing regenerator secondary air amount by a predetermined proportion, when the natural gas is opened, reducing natural gas incoming by a predetermined proportion, elevating gradually to a set value, reducing the secondary air amount of the multiple inputs step by step to the original set point, thus stabilizing the kiln furnace pressure within a dozen of seconds, which is beneficial for the stabilization for the melting tank vitreous body level.

Description

A kind of small perturbation reversal control method for kiln furnace

Technical field

The present invention relates to the small perturbation reversal control method for kiln furnace of glass furnace natural gas system, secondary ventilation system, combustion rifle protection gas system and flue shutter system in changing fiery process.

Background technology

The cross flame combustion glass melting furnace is in the process of molten glass; in order to prolong the work-ing life of melting furnaces tank block; usually adopt the kiln both sides to exchange left and right sides fuel feed within a certain period of time; both sides intermittently exchange one-sided incendiary mode; this process relates to natural gas system; secondary ventilation system; the switching motion of a series of on-the-spot topworkies such as combustion rifle protection gas system and flue shutter system; the variation of above process certainly will produce bigger fluctuation to the operating mode of glass furnace combustion processes; control and undesirablely will cause declining to a great extent of kiln temperature; the significantly variation of furnace pressure and the fluctuation of glass liquid level in the melting pool; more than be called as the significantly variation of melting furnaces three elements; will produce greatly the melting process of glass and impact; more can't guarantee to melt high-quality glass, simultaneously to also having caused great harm the work-ing life of melting furnaces.Program process finished when the fire control system method of changing original glass furnace had only realized, do not exchange the stable measure of taking any optimization of kiln operating mode in the fiery process, make that to change fiery process stabilization required time longer, therefore to the temperature of melting furnaces three elements, the influence of furnace pressure and liquid level is very big, has had a strong impact on the quality of glass.When former kiln exchange system designs; in order to realize ceasing fire the less variation of furnace pressure afterwards; Beijing the tenth glass designing institute is according to Theoretical Calculation; one typhoon machine once was set on flue collector; link with the kiln exchange system; variable frequency control; be implemented in to change in the fiery process and blast a certain proportion of air by processing requirement; thereby satisfy furnace pressure than minor swing; its shortcoming is to need to increase hardware device i.e. a typhoon machine and a large amount of airduct and power; function unit; blower fan; the installation of airduct and controlling board makes original spacious inadequately flue superjacent air space more be becoming tight again, gives the maintenance of miscellaneous equipment; maintenance causes certain difficulty.

Summary of the invention

The objective of the invention is to overcome the shortcoming of above-mentioned prior art, provide a kind of kiln of can stablizing to change temperature, furnace pressure and liquid level in the fiery process, and energy-conservation, consumption reduction, reduce production costs, raise labour productivity, ignition method is changed in the kiln microvariations that prolong the work-ing life of kiln and combustion rifle equipment.

For achieving the above object, the control method that the present invention adopts is: at first when either side changes fiery early warning signal and arrives, Controlling System is remembered control aperture, set(ting)value and the master mode of Sweet natural gas, secondary air, furnace pressure, liquid level and branch flue flashboard under this side best combustion situation, and this is organized data storage in database; Close the natural air valve of this side then and by system validation, and open this side combustion rifle protection air; When this side is changed the arrival of fire exchange control signal, the secondary air of each port regenerator is undertaken from the exchange of this side direction opposite side by magnetic valve and the exchange cylinder that is installed on the air main, exchange the cylinder action this moment, secondary air is changed to opposite side from this top-cross, Sweet natural gas when Controlling System is called opposite side burning the best of memory last time, secondary air, furnace pressure, liquid level and branch flue flashboard control aperture, set(ting)value and master mode parameter, on former aperture basis in when burning fuel Sweet natural gas and 1: 10 ratio of secondary air mixed firing in kiln, finish the melting process of frit in the kiln, after natural air to close closes, with the aperture increase 0.1～0.3% of secondary air; Flue shutter is finished this side and is opened, and opposite side is closed changes fiery exchange process and by system validation; Opposite side Sweet natural gas interchange valve is opened, and this side combustion rifle protection air to close closes, and the Sweet natural gas aperture when the opposite side burning that at first will remember last time of system afterwards is best reduces 1～3%, mixes in kiln, burns with the secondary air that had exchanged simultaneously; Sweet natural gas aperture and secondary air aperture increase and decrease in 1: 1 ratio, eliminate secondary air increase in the exchange process gradually, and the compensation optimizing process that Sweet natural gas reduces carries out the transition to normal combustion melting process within one minute.

Because the present invention is according to the actual requirement and the kiln combustion conditions of kiln technological process, in less than the fiery process of 35 seconds change, anticipate fuel, the ratio of burning air quantity, be closed in the process of unlatching at Sweet natural gas, suitably improve the regenerator secondary air flow of certain ratio, to replenish because closing of Sweet natural gas caused reducing of furnace pressure, because secondary air is through regeneration treatment, the variation of temperature amplitude will further be dwindled in the kiln, when Sweet natural gas is opened, reduce the input of amount of natural gas at first by a certain percentage, and rise to set(ting)value gradually, secondary air flow to many inputs progressively narrows down to original set(ting)value by a certain percentage simultaneously, makes the kiln furnace pressure obtain bigger stablizing in tens short seconds, and the stable of furnace pressure will help the stable of melting pool glass liquid level.

Description of drawings

Fig. 1 is the processing unit schema of natural gas system of the present invention and combustion rifle protection air system;

Fig. 2 is the present invention is changed fire to the right by the left side a control flow chart.

Embodiment

Below in conjunction with accompanying drawing the present invention is described in further detail.

Referring to Fig. 1; when burning in the left side; six the Sweet natural gas interchange valve ZG1-ZG6 in left side open entirely; the natural air gun protection in left side pressure lock Close All; natural gas via main pipe line and each small transfer line enter each natural air gun, and combustion gas sprays into kiln and mixes with secondary air and burn, and right side six Sweet natural gas interchange valves YG1-YG6 Close All; right side natural air gun protection pressure lock is all opened, and combustion rifle in protection right side is not burnt out.When burning on the right side, valve position switch is just in time opposite with the left side.

Referring to Fig. 2, when changing fiery early warning signal and arrive, manually set turnaround time, and by the Sweet natural gas under this survey of nondeclarative memory best combustion situation, secondary air, furnace pressure, liquid level and the control of branch flue flashboard aperture, set(ting)value and master mode, data storage is right side stored data base (a 2) initialize also in database (1);

Change fiery process and begin exchange, this moment, program locked Sweet natural gas, secondary air, furnace pressure, liquid level and branch flue flashboard control mode, entered program controlled mode, and operator can't intervene;

At first close natural air valve in left side and program validation, open a left side then and survey combustion rifle protection air, the safety of guaranteeing to fire rifle, left flue shutter is opened, and right flue shutter is closed;

Secondary air is changed the action of internal heat cylinder, left side secondary air is closed, right secondary air is opened, the wind that burns exchanges to the right side, Sweet natural gas when this side burning of routine call memory last time is best then, secondary air, furnace pressure, liquid level and branch flue flashboard control aperture, parameter such as set(ting)value and master mode is each controlled variable of database (2), start preprocessor simultaneously, on former aperture basis by when burning fuel Sweet natural gas/sky secondary general mood by 1: 10 mixed, when Natural gas consumption is 1500NM3/H, secondary air is 15000NM3/H, therefore after natural air to close closes, consider metering and invisible waste, the secondary air aperture generally need increase 0.1～0.3%, closes and the furnace pressure deficiency that causes with supplemental natural gas;

Right side Sweet natural gas control valve is opened; right side combustion rifle protection air to close closes; after process in; each blow-off outlet opening value of Sweet natural gas when this side burning of memory last time that program at first will be called is best reduces certain ratio (being generally 1～3% in conjunction with this ratio in technology and theoretical); to prevent that furnace pressure from increasing; while Sweet natural gas and secondary air increase and decrease in 1: 1 ratio, eliminate secondary air increase in the exchange process gradually, the compensation optimizing process that Sweet natural gas reduces.

Program is to Sweet natural gas, secondary air, furnace pressure, liquid level and the release of branch flue flashboard control mode, and the operator gives with control in system, in 30 seconds, wholely changes fiery end of processing, carries out the transition to normal combustion melting process within one minute.

The present invention is by above control method, make and change fiery process operating mode and obtained very big stable, because in changing fiery process, each loop control program is manual, the disturbance of therefore changing fiery process becomes to threaten to control loop inadequately, after operating mode is basicly stable, Controlling System enters automatic control automatically, because parameter is to call the data of last time during best combustion, so original good state of combustion and operating mode continued, show on the furnace pressure it is to foreshorten in 1 minute by original 5 minutes steady time, liquid level is unaffected substantially, and the kiln temperature rangeability has also had very big must dwindling than in the past.

Claims

1, a kind of small perturbation reversal control method for kiln furnace is characterized in that:

1) at first when either side changes fiery early warning signal and arrives, Controlling System is remembered control aperture, set(ting)value and the master mode of Sweet natural gas, secondary air, furnace pressure, liquid level and branch flue flashboard under this side best combustion situation, and this is organized data storage in database;

2) close the natural air valve of this side and then, and open this side combustion rifle protection air by system validation;

3) when this side is changed the arrival of fire exchange control signal, the secondary air of each port regenerator is undertaken from the exchange of this side direction opposite side by magnetic valve and the exchange cylinder that is installed on the air main, exchange the cylinder action this moment, secondary air is changed to opposite side from this top-cross, Sweet natural gas when Controlling System is called opposite side burning the best of memory last time, secondary air, furnace pressure, liquid level and branch flue flashboard control aperture, set(ting)value and master mode parameter, on former aperture basis in when burning fuel Sweet natural gas and 1: 10 ratio of secondary air mixed firing in kiln, finish the melting process of frit in the kiln, after natural air to close closes, with the aperture increase 0.1～0.3% of secondary air;

4) flue shutter is finished this side and is opened, and opposite side is closed changes fiery exchange process and by system validation;

5) opposite side Sweet natural gas interchange valve is opened, and this side combustion rifle protection air to close closes, and the Sweet natural gas aperture when the opposite side burning that at first will remember last time of system afterwards is best reduces 1～3%, mixes in kiln, burns with the secondary air that had exchanged simultaneously;

6) Sweet natural gas aperture and secondary air aperture be in the increase and decrease of 1: 1 ratio, eliminates gradually that secondary air increases in the exchange process, and the compensation optimizing process that Sweet natural gas reduces carries out the transition to normal combustion melting process within one minute.