CN104503519B - Boiler drum water level control method and boiler drum water level control device - Google Patents
Boiler drum water level control method and boiler drum water level control device Download PDFInfo
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- CN104503519B CN104503519B CN201410720187.2A CN201410720187A CN104503519B CN 104503519 B CN104503519 B CN 104503519B CN 201410720187 A CN201410720187 A CN 201410720187A CN 104503519 B CN104503519 B CN 104503519B
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Abstract
The embodiment of the invention discloses a boiler drum water level control method and a boiler drum water level control device. The method comprises the steps of acquiring the display value of a water level gauge of a boiler drum at an interval of set period, determining whether the display value is equal to the optimal water level of the boiler drum, calculating the transient added water mass and the transient steam mass of the boiler drum if the display value is not equal to the optimal water level of the boiler drum, reducing the added water flow by a first set value if the transient added water mass is greater than the transient steam mass, and increasing the added water flow by the first set value if the transient added water mass is smaller than the transient steam mass. Compared with the method of adjusting the added water flow according to the steam flow in the prior art, the water level of the boiler drum can be accurately controlled to the optimal water level, sharp fluctuation of the water level of the boiler drum is avoided, and the gas-liquid conversion and energy efficiency ratio of the boiler drum are ensured.
Description
Technical field
The present invention relates to technical field of automation, more particularly, to a kind of method for controlling water level of boiler-steam dome and device.
Background technology
Boiler-steam dome is the critical component of natural circulation boiler, and can it normal work be directly connected to water circulation in boiler
Safety and output steam quality.The water level of boiler-steam dome is impact boiler natural labor, the important parameter of high yield: if boiler-steam dome
Water level too low, the water yield in boiler-steam dome is less, and when load becomes big, water consumption in boiler-steam dome is accelerated, may whole vapour
Change, unsafe condition occurs；If the water level of boiler-steam dome is too high, because boiler-steam dome is usually the cylinder of horizontal, gas-liquid contact
Area diminishes, and rate of gasification reduces, and produces water entrained by steam phenomenon, temperature also can reduce so that the efficiency of boiler substantially reduces, or even
Boiler-steam dome can be made impaired.Therefore, accurately control the water level of boiler-steam dome extremely important.
According to the method for controlling water level of existing boiler-steam dome, (unit is m to the steam flow of acquisition boiler-steam dome first3/
H), then according to obtain steam flow adjust boiler-steam dome the flow that adds water (unit be m3/ h), thus in boiler-steam dome
Water level be controlled.
In the above-mentioned methods, due to the restriction of working condition, the pressure and temperature within boiler-steam dome constantly changes,
And steam is as gas, different pressure, at a temperature of, instantaneous quality of steam is different, therefore, is adjusted according to steam flow and adds water
The water level of boiler-steam dome cannot accurately be controlled during flow, this may result in the water level fluctuation of boiler-steam dome, and then affect gas
Liquid is changed, or even the Energy Efficiency Ratio of impact boiler.
Content of the invention
The embodiment of the present invention provides a kind of method for controlling water level of boiler-steam dome and device, in order to solve to deposit in prior art
The water level that cannot accurately control boiler-steam dome, the water level fluctuation of the boiler-steam dome leading to, so affect gas-liquid conversion,
Even affect the problem of the Energy Efficiency Ratio of boiler.
According to embodiments of the present invention, provide a kind of method for controlling water level of boiler-steam dome, comprising:
Obtain the show value of the water-level gauge of described boiler-steam dome with setting cycle；
Determine whether described show value is equal to the optimum level of water of described boiler-steam dome；
If described show value is not equal to the optimum level of water of described boiler-steam dome, calculate the matter that instantaneously adds water of described boiler-steam dome
Amount and instantaneous quality of steam；
If the described quality that instantaneously adds water is more than described instantaneous quality of steam, described boiler-steam dome is reduced with the first setting value
The flow that adds water；
If the described quality that instantaneously adds water is less than described instantaneous quality of steam, described boiler is increased with described first setting value
The flow that adds water of drum.
Optionally, obtain the show value of water-level gauge of described boiler-steam dome with setting cycle after, determine described show value
Before whether being equal to the optimum level of water of described boiler-steam dome, also include:
Determine described show value and the maximum stage of described boiler-steam dome and the relation of lowest water level；
If described show value is more than or equal to described maximum stage, reduce the wink of described boiler-steam dome with the second setting value
Shi Jiashui flow, described second setting value is more than described first setting value；
If described show value is less than or equal to described lowest water level, described boiler-steam dome is increased with described second setting value
The flow that instantaneously adds water；
If described show value is between described maximum stage and described lowest water level, whether execution determines described show value etc.
Step in the optimum level of water of described boiler-steam dome.
Optionally, obtain the show value of water-level gauge of described boiler-steam dome with setting cycle after, determine described show value
Before whether being equal to the optimum level of water of described boiler-steam dome, also include:
Calculate the half of the maximum stage of described boiler-steam dome and the difference of lowest water level, obtain water level deviator；
Determine described show value and the optimum level of water of described boiler-steam dome and the relation of described water level deviator；
If described show value is more than or equal to described water level deviator with the difference of the optimum level of water of described boiler-steam dome, with
Second setting value reduces the flow that adds water of described boiler-steam dome, and described second setting value is more than described first setting value；
If described optimum level of water is less than or equal to described water level deviator with the difference of described show value, set with described second
Definite value increases the flow that adds water of described boiler-steam dome；
If the difference of the optimum level of water of described show value and described boiler-steam dome be less than described water level deviator or described
Good water level is more than described water level deviator with the difference of described show value, and execution determines whether described show value is equal to described boiler vapour
The step of the optimum level of water of bag.
Specifically, calculate the instantaneous quality of steam of described boiler-steam dome, specifically include:
Obtain steam pressure, vapor (steam) temperature and the steam flow of described boiler-steam dome；
Determine the steam specific volume of described boiler-steam dome according to the steam pressure obtaining and vapor (steam) temperature；
Described instantaneous quality of steam is calculated according to the steam specific volume of described boiler-steam dome, steam flow and quality coefficient.
Specifically, determine the steam specific volume of described boiler-steam dome according to the steam pressure obtaining and vapor (steam) temperature, concrete bag
Include:
Steam specific volume v according to the following equation described boiler-steam dome of calculating:
P is steam pressure, and t is vapor (steam) temperature；
Described instantaneous quality of steam is calculated according to the steam specific volume of described boiler-steam dome, steam flow and quality coefficient,
Specifically include:
Described instantaneous quality of steam m:m=kv/v is calculated according to following equation, k is quality coefficient, v is steam flow.
According to embodiments of the present invention, a kind of water-level control apparatus of boiler-steam dome are also provided, comprising:
Acquiring unit, for obtaining the show value of the water-level gauge of described boiler-steam dome with setting cycle；
First determining unit, for determining whether described show value is equal to the optimum level of water of described boiler-steam dome；
First computing unit, if be not equal to the optimum level of water of described boiler-steam dome for described show value, calculates described pot
Instantaneously add water quality and the instantaneous quality of steam of stove drum；
Control unit, if being more than described instantaneous quality of steam for the described quality that instantaneously adds water, is subtracted with the first setting value
The flow that adds water of little described boiler-steam dome；If the described quality that instantaneously adds water is less than described instantaneous quality of steam, with described first
Setting value increases the flow that adds water of described boiler-steam dome.
Optionally, also include the second determining unit, for determining the maximum stage of described show value and described boiler-steam dome
Relation with lowest water level；
Described control unit, if be additionally operable to described show value to be more than or equal to described maximum stage, with the second setting value
Reduce the flow that instantaneously adds water of described boiler-steam dome, described second setting value is more than described first setting value；If described show value
Less than or equal to described lowest water level, then increase the flow that instantaneously adds water of described boiler-steam dome with described second setting value；If institute
State show value between described maximum stage and described lowest water level, turn to described first determining unit.
Optionally, the second computing unit and the 3rd determining unit are also included, wherein:
Described second computing unit, for calculating the one of the maximum stage of described boiler-steam dome and the difference of lowest water level
Half, obtain water level deviator；
Described 3rd determining unit, for determining the optimum level of water of described show value and described boiler-steam dome and described water level
The relation of deviator；
Described control unit, if the difference being additionally operable to described show value and the optimum level of water of described boiler-steam dome is more than or waits
In described water level deviator, then reduce the flow that adds water of described boiler-steam dome with the second setting value, described second setting value is more than institute
State the first setting value；If described optimum level of water is less than or equal to described water level deviator with the difference of described show value, with described
Second setting value increases the flow that adds water of described boiler-steam dome；If the difference of the optimum level of water of described show value and described boiler-steam dome
Value is more than described water level deviator less than described water level deviator or described optimum level of water with the difference of described show value, and execution is really
The step whether fixed described show value is equal to the optimum level of water of described boiler-steam dome.
Specifically, described first computing unit, specifically for:
Obtain steam pressure, vapor (steam) temperature and the steam flow of described boiler-steam dome；
Determine the steam specific volume of described boiler-steam dome according to the steam pressure obtaining and vapor (steam) temperature；
Described instantaneous quality of steam is calculated according to the steam specific volume of described boiler-steam dome, steam flow and quality coefficient.
Specifically, described first computing unit, specifically for:
Steam specific volume v according to the following equation described boiler-steam dome of calculating:
P is steam pressure, and t is vapor (steam) temperature；
Described instantaneous quality of steam m:m=kv/v is calculated according to following equation, k is quality coefficient, v is steam flow.
The present invention has the beneficial effect that:
The embodiment of the present invention provides a kind of method for controlling water level of boiler-steam dome and device, by obtaining institute with setting cycle
State the show value of the water-level gauge of boiler-steam dome；Determine whether described show value is equal to the optimum level of water of described boiler-steam dome；If institute
State the optimum level of water that show value is not equal to described boiler-steam dome, calculate instantaneously add water quality and the instantaneous steam of described boiler-steam dome
Quality；If the described quality that instantaneously adds water is more than described instantaneous quality of steam, described boiler-steam dome is reduced with the first setting value
Add water flow；If the described quality that instantaneously adds water is less than described instantaneous quality of steam, described pot is increased with described first setting value
The flow that adds water of stove drum.In the program, according to boiler-steam dome instantaneously add water quality and instantaneous quality of steam whether equal come
Determine how the flow that adds water adjusting boiler-steam dome, guaranteed instantaneously to add water quality by the multiple flow that adds water adjusting boiler-steam dome
Equal to instantaneous quality of steam, so that it is guaranteed that the quality of water is in stable state in boiler-steam dome, and then reach boiler-steam dome
Water lev el control in the purpose of optimum level of water, method with respect to the flow that adds water being adjusted according to steam flow in prior art, can
Exactly by the water lev el control of boiler-steam dome in optimum level of water, it is to avoid the water level fluctuation of boiler-steam dome is it is ensured that boiler-steam dome
Gas-liquid conversion and Energy Efficiency Ratio.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, for those of ordinary skill in the art
Speech, without having to pay creative labor, can also obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of the method for controlling water level of the first boiler-steam dome in the embodiment of the present invention；
Fig. 2 is the schematic flow sheet of the method for controlling water level of second boiler-steam dome in the embodiment of the present invention；
Fig. 3 is the schematic flow sheet of the method for controlling water level of the third boiler-steam dome in the embodiment of the present invention；
Fig. 4 is the structural representation of the water-level control apparatus of the first boiler-steam dome in the embodiment of the present invention；
Fig. 5 is the structural representation of the water-level control apparatus of second boiler-steam dome in the embodiment of the present invention；
Fig. 6 is the structural representation of the water-level control apparatus of the third boiler-steam dome in the embodiment of the present invention.
Specific embodiment
For the water level that cannot accurately control boiler-steam dome present in prior art, the water level of the boiler-steam dome leading to
Fluctuation, so affect gas-liquid conversion, or even impact boiler Energy Efficiency Ratio problem, inventor have made intensive studies send out
Existing, store steam and water in boiler-steam dome, water level is used for describing the storage capacity of water in boiler-steam dome, the instantaneous stream of boiler-steam dome
Entering quality is the quality that instantaneously adds water, and the instantaneous outflow quality of boiler-steam dome is instantaneous quality of steam, when the quality that instantaneously adds water is equal to
During instantaneous quality of steam, the water level of boiler-steam dome tends towards stability, therefore can be by adjusting instantaneous quality of steam and instantaneously adding water
Quality equal controlling the water level of boiler-steam dome.Based on this, the embodiment of the present invention provides a kind of water lev el control side of boiler-steam dome
Method, the flow process of the method is as shown in figure 1, execution step is as follows:
S11: obtain the show value of the water-level gauge of boiler-steam dome with setting cycle.
Generally be provided with water-level gauge in boiler-steam dome, this water-level gauge is used for measuring the water level in boiler-steam dome, water-level gauge aobvious
What indicating value represented is the water level in boiler-steam dome, in order to be controlled to the water level in boiler-steam dome, needs periodically to obtain water level
The show value of meter, specifically can obtain the show value of water-level gauge using setting cycle, and setting cycle can enter according to actual needs
Row sets, such as 1 second, 2 seconds, 5 seconds, 10 seconds, 15 seconds, 30 seconds etc..
S12: determine whether show value is equal to the optimum level of water of boiler-steam dome, if show value is not equal to the optimal of boiler-steam dome
Water level, executes s13；If show value is equal to the optimum level of water of boiler-steam dome, execute s11.
In order to ensure the Energy Efficiency Ratio highest of boiler, the water level of boiler-steam dome has an optimal value, can be defined as
Good water level, when the water level of boiler-steam dome is higher or lower than optimum level of water, the Energy Efficiency Ratio of boiler is not highest, therefore, really
It is very important that the water level of guarantor's boiler-steam dome is in optimum level of water.When the show value of water-level gauge is not equal to optimum level of water, need
The water level of boiler-steam dome to be adjusted；Conversely, being then not required to adjust the water level of boiler-steam dome, s11 can be continued executing with.
S13: calculate instantaneously add water quality and the instantaneous quality of steam of boiler-steam dome, if the quality that instantaneously adds water is more than instantaneous steaming
Vapour quality, executes s14；If the quality that instantaneously adds water is less than instantaneous quality of steam, execute s15.
When the quality that instantaneously adds water of boiler-steam dome is equal to instantaneous quality of steam, the water of boiler-steam dome can be controlled exactly
Position, therefore when the show value of water-level gauge is not equal to optimum level of water, can calculate instantaneously add water quality and instantaneous steam matter
The magnitude relationship of amount, then determines how the flow that adds water of adjustment boiler-steam dome according to this magnitude relationship.
S14: reduce the flow that adds water of boiler-steam dome with the first setting value.
When the quality that instantaneously adds water is more than instantaneous quality of steam, illustrate that the water flowing into boiler-steam dome is more than from boiler-steam dome
Flow out steam, at this moment the water level in boiler-steam dome can be gradually increasing it is therefore desirable to reduces inflow boiler-steam dome water, Ke Yi
One setting value reduces the flow that adds water of boiler-steam dome, and the first setting value can be set according to actual needs, for example, can be
Maximum adds water 15%, 20%, the 25% etc. of flow.
S15: increase the flow that adds water of boiler-steam dome with the first setting value.
When the quality that instantaneously adds water is less than instantaneous quality of steam, illustrate that the water flowing into boiler-steam dome is less than from boiler-steam dome
Flow out steam, at this moment the water level in boiler-steam dome can be gradually reduced it is therefore desirable to increase inflow boiler-steam dome water, Ke Yi
One setting value increases the flow that adds water of boiler-steam dome.
In the program, according to boiler-steam dome instantaneously add water quality and instantaneous quality of steam whether equal determining how tune
Save the flow that adds water of boiler-steam dome, guarantee instantaneously to add water quality equal to instantaneous steaming by the multiple flow that adds water adjusting boiler-steam dome
Vapour quality, so that it is guaranteed that the quality of water is in stable state in boiler-steam dome, and then reaches the water lev el control of boiler-steam dome exists
The purpose of optimum level of water, the method with respect to the flow that adds water being adjusted according to steam flow in prior art, can be exactly by pot
The water lev el control of stove drum is in optimum level of water, it is to avoid the water level fluctuation of boiler-steam dome is it is ensured that the gas-liquid of boiler-steam dome is changed
And Energy Efficiency Ratio.
Can realize the water level of boiler-steam dome is controlled by step s11-s15, obtaining with setting cycle in s11
After taking the show value of water-level gauge of boiler-steam dome, determination show value in s12 whether be equal to boiler-steam dome optimum level of water it
Before, the process once water level of boiler-steam dome being controlled can also be included, two kind optional modes are described below:
The first optional mode, as shown in Fig. 2 on the basis of step as shown in Figure 1, also including:
S16: determine show value and the maximum stage of boiler-steam dome and the relation of lowest water level, if show value is more than or equal to
Maximum stage, executes s17；If show value is less than or equal to lowest water level, execute s18；If show value is in maximum stage and minimum
Between water level, execute 12.
S17: reduce the flow that adds water of boiler-steam dome with the second setting value, execute s11.
S18: increase the flow that adds water of boiler-steam dome with the second setting value, execute s11.
The maximum stage of boiler-steam dome is to ensure that the maximum stage of boiler-steam dome trouble free service, the lowest water level of boiler-steam dome
It is to ensure that the lowest water level of boiler-steam dome trouble free service, accordingly, it would be desirable to the pass according to show value and maximum stage and lowest water level
System determines whether to increase the flow that adds water of boiler-steam dome.
If l represents the show value of water-level gauge, represent maximum stage with lmax, represented with lmin and descend water level most, then, when l >=
During lmax, reduce the flow that adds water of boiler-steam dome with the second setting value, as l≤lmin, boiler vapour is increased with the second setting value
The flow that adds water of bag, if when lmin < l < during lmax, can execute s12, wherein, the second setting value can be according to actual needs
Set, for example, can be 15%, 20%, 25% of the maximum flow that adds water etc., the second setting value is more than the first setting value.
The optional mode of second, as shown in figure 3, on the basis of step as shown in Figure 1, also including:
S19: calculate the half of the maximum stage of boiler-steam dome and the difference of lowest water level, obtain water level deviator.
S20: determine show value and the optimum level of water of boiler-steam dome and the relation of water level deviator, if show value and boiler-steam dome
Optimum level of water difference be more than or equal to water level deviator, execute s21；If optimum level of water is less than or equal to the difference of show value
Water level deviator, executes s22；If show value is less than water level deviator or optimum level of water with the difference of the optimum level of water of boiler-steam dome
It is more than water level deviator with the difference of show value, execute s12.
S21: reduce the flow that adds water of boiler-steam dome with the second setting value, execute s11.
S22: increase the flow that adds water of boiler-steam dome with the second setting value, execute s11.
If representing water level deviator with δ l, δ l=(lmax-lmin)/2, if representing optimum level of water with sp, work as l-sp
During >=δ l, reduce the flow that adds water of boiler-steam dome with the second setting value, as sp-l >=δ l, boiler is increased with the second setting value
The flow that adds water of drum, as l-sp < δ l or sp-l < δ l, executes s12, wherein, the second setting value can be according to actual need
Set, for example, can be 15%, 20%, 25% of the maximum flow that adds water etc., the second setting value is more than the first setting
Value..
The second setting value in above two mode is more than the first setting value, is accomplished that the thick of the water level to boiler-steam dome
Adjust, and step s11-s15 is accomplished that the fine tuning of the water level to boiler-steam dome that is to say, that first passing through significantly regulation boiler
The water lev el control of boiler-steam dome between maximum stage and lowest water level, is then adjusted pot by the flow that adds water of drum more by a small margin
The flow that adds water of stove drum by the water lev el control of boiler-steam dome in optimum level of water, thus realizing accurately controlling the water of boiler-steam dome
Position, it is to avoid the water level fluctuation of boiler-steam dome in prior art, and then ensure gas-liquid conversion and the Energy Efficiency Ratio of boiler-steam dome.
Specifically, the instantaneous quality of steam of the calculating boiler-steam dome in above-mentioned s13, specifically includes:
Obtain steam pressure, vapor (steam) temperature and the steam flow of boiler-steam dome；
Determine the steam specific volume of boiler-steam dome according to the steam pressure obtaining and vapor (steam) temperature；
Instantaneous quality of steam is calculated according to the steam specific volume of boiler-steam dome, steam flow and quality coefficient.
Because steam is gas, need to calculate the instantaneous quality of steam of boiler-steam dome according to the calculation of gas.Tool
Body can include, and the first-selected steam pressure obtaining boiler-steam dome, vapor (steam) temperature and steam flow, then according to the vapour pressure obtaining
Power and the steam specific volume of vapor (steam) temperature calculating boiler-steam dome, finally according to the steam specific volume of boiler-steam dome, steam flow and matter
Coefficient of discharge calculates instantaneous quality of steam.
Wherein, calculate the steam specific volume of boiler-steam dome and instantaneous quality of steam can have various ways, one kind is set forth below
Mode illustrates.If represent the steam specific volume of boiler-steam dome with v, then, formula can be adopted Calculate the steam specific volume v of boiler-steam dome, p is steam pressure, t
For vapor (steam) temperature；If representing instantaneous quality of steam with m, then, instantaneous quality of steam can be calculated using formula m=kv/v, v is
Steam flow, k is quality coefficient.
The value of k can draw through repetition test, particularly as follows: from the value of k is 1, the water level of record boiler-steam dome becomes
Change, if water level is in slow ascendant trend, reduces the value of k, otherwise increase the value of k, until water level is relatively stable, needed
The quality coefficient wanted.
Based on same inventive concept, the embodiment of the present invention provides a kind of water-level control apparatus of boiler-steam dome, and this device can
To be arranged in boiler-steam dome, structure is as shown in figure 4, include acquiring unit 41, the first determining unit 42, the first computing unit 43
With control unit 44, wherein:
Above-mentioned acquiring unit 41, for obtaining the show value of the water-level gauge of boiler-steam dome with setting cycle.
Above-mentioned first determining unit 42, for determining whether show value is equal to the optimum level of water of boiler-steam dome.
Above-mentioned first computing unit 43, if be not equal to the optimum level of water of boiler-steam dome for show value, calculates boiler-steam dome
Instantaneously add water quality and instantaneous quality of steam.
Above-mentioned control unit 44, if being more than instantaneous quality of steam for the quality that instantaneously adds water, is reduced with the first setting value
The flow that adds water of boiler-steam dome；If the quality that instantaneously adds water is less than instantaneous quality of steam, boiler-steam dome is increased with the first setting value
The flow that adds water.
In the program, according to boiler-steam dome instantaneously add water quality and instantaneous quality of steam whether equal determining how tune
Save the flow that adds water of boiler-steam dome, guarantee instantaneously to add water quality equal to instantaneous steaming by the multiple flow that adds water adjusting boiler-steam dome
Vapour quality, so that it is guaranteed that the quality of water is in stable state in boiler-steam dome, and then reaches the water lev el control of boiler-steam dome exists
The purpose of optimum level of water, the method with respect to the flow that adds water being adjusted according to steam flow in prior art, can be exactly by pot
The water lev el control of stove drum is in optimum level of water, it is to avoid the water level fluctuation of boiler-steam dome is it is ensured that the gas-liquid of boiler-steam dome is changed
And Energy Efficiency Ratio.
The embodiment of the present invention provides the water-level control apparatus of second boiler-steam dome, the structure of this device as shown in figure 5,
On the basis of device as shown in Figure 4, also include the second determining unit 45, for determining the flood of show value and boiler-steam dome
Position and the relation of lowest water level.
Control unit 44, if being additionally operable to show value to be more than or equal to maximum stage, reduces boiler vapour with the second setting value
The flow that instantaneously adds water of bag, the second setting value is more than the first setting value；If show value is less than or equal to lowest water level, with second
Setting value increases the flow that instantaneously adds water of boiler-steam dome；If show value is between maximum stage and lowest water level, turn to first true
Order unit 42.
The embodiment of the present invention provides the water-level control apparatus of the third boiler-steam dome, the structure of this device as shown in fig. 6,
On the basis of device as shown in Figure 4, also include the second computing unit 46 and the 3rd determining unit 47, wherein:
Above-mentioned second computing unit 46, for calculating the half of the maximum stage of boiler-steam dome and the difference of lowest water level,
Obtain water level deviator.
Above-mentioned 3rd determining unit 47, for determining show value and the optimum level of water of boiler-steam dome and the pass of water level deviator
System.
Control unit 44, if it is inclined more than or equal to water level with the difference of the optimum level of water of boiler-steam dome to be additionally operable to show value
Amount, then reduce the flow that adds water of boiler-steam dome with the second setting value, and the second setting value is more than the first setting value；If optimum level of water with
The difference of show value is less than or equal to water level deviator, then increase the flow that adds water of boiler-steam dome with the second setting value；If show value
Inclined more than water level with the difference of show value less than water level deviator or optimum level of water with the difference of the optimum level of water of boiler-steam dome
Amount, turns to determining unit 42.
Specifically, above-mentioned first computing unit 43, specifically for:
Obtain steam pressure, vapor (steam) temperature and the steam flow of boiler-steam dome；
Determine the steam specific volume of boiler-steam dome according to the steam pressure obtaining and vapor (steam) temperature；
Instantaneous quality of steam is calculated according to the steam specific volume of boiler-steam dome, steam flow and quality coefficient.
Specifically, above-mentioned first computing unit 43, specifically for:
Steam specific volume v according to following equation calculating boiler-steam dome:
P is steam pressure, and t is vapor (steam) temperature；
Instantaneous quality of steam m:m=kv/v is calculated according to following equation, k is quality coefficient, v is steam flow.
The present invention is the flow process with reference to method according to embodiments of the present invention, equipment (system) and computer program
Figure and/or block diagram are describing.It should be understood that can be by each stream in computer program instructions flowchart and/or block diagram
Flow process in journey and/or square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
The processor instructing all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device is to produce
A raw machine is so that produced for reality by the instruction of computer or the computing device of other programmable data processing device
The device of the function of specifying in present one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions may be alternatively stored in and can guide computer or other programmable data processing device with spy
Determine in the computer-readable memory that mode works so that the instruction generation inclusion being stored in this computer-readable memory refers to
Make the manufacture of device, this command device realize in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or
The function of specifying in multiple square frames.
These computer program instructions also can be loaded in computer or other programmable data processing device so that counting
On calculation machine or other programmable devices, execution series of operation steps to be to produce computer implemented process, thus in computer or
On other programmable devices, the instruction of execution is provided for realizing in one flow process of flow chart or multiple flow process and/or block diagram one
The step of the function of specifying in individual square frame or multiple square frame.
Although having been described for the alternative embodiment of the present invention, those skilled in the art once know basic creation
Property concept, then can make other change and modification to these embodiments.So, claims are intended to be construed to including can
Select embodiment and fall into being had altered and changing of the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification without deviating from this to the embodiment of the present invention
The spirit and scope of bright embodiment.So, if these modifications of the embodiment of the present invention and modification belong to the claims in the present invention
And its within the scope of equivalent technologies, then the present invention is also intended to comprise these changes and modification.
Claims (8)
1. a kind of method for controlling water level of boiler-steam dome is it is characterised in that include:
Obtain the show value of the water-level gauge of described boiler-steam dome with setting cycle；
Determine whether described show value is equal to the optimum level of water of described boiler-steam dome；
If described show value is not equal to the optimum level of water of described boiler-steam dome, calculate described boiler-steam dome instantaneously add water quality and
Instantaneous quality of steam；
If the described quality that instantaneously adds water is more than described instantaneous quality of steam, adding of described boiler-steam dome, is reduced with the first setting value
Discharge；
If the described quality that instantaneously adds water is less than described instantaneous quality of steam, described boiler-steam dome is increased with described first setting value
The flow that adds water；
Wherein, calculate the instantaneous quality of steam of described boiler-steam dome, specifically include:
Obtain steam pressure, vapor (steam) temperature and the steam flow of described boiler-steam dome；
Determine the steam specific volume of described boiler-steam dome according to the steam pressure obtaining and vapor (steam) temperature；
Described instantaneous quality of steam is calculated according to the steam specific volume of described boiler-steam dome, steam flow and quality coefficient.
2. the method for claim 1 it is characterised in that obtain the aobvious of the water-level gauge of described boiler-steam dome with setting cycle
After indicating value, before determining the optimum level of water whether described show value is equal to described boiler-steam dome, also include:
Determine described show value and the maximum stage of described boiler-steam dome and the relation of lowest water level；
If described show value is more than or equal to described maximum stage, the instantaneous of described boiler-steam dome is reduced with the second setting value and adds
Discharge, described second setting value is more than described first setting value；
If described show value is less than or equal to described lowest water level, increase the wink of described boiler-steam dome with described second setting value
Shi Jiashui flow；
If described show value is between described maximum stage and described lowest water level, execution determines whether described show value is equal to institute
The step stating the optimum level of water of boiler-steam dome.
3. the method for claim 1 it is characterised in that obtain the aobvious of the water-level gauge of described boiler-steam dome with setting cycle
After indicating value, before determining the optimum level of water whether described show value is equal to described boiler-steam dome, also include:
Calculate the half of the maximum stage of described boiler-steam dome and the difference of lowest water level, obtain water level deviator；
Determine described show value and the optimum level of water of described boiler-steam dome and the relation of described water level deviator；
If described show value is more than or equal to described water level deviator with the difference of the optimum level of water of described boiler-steam dome, with second
Setting value reduces the flow that adds water of described boiler-steam dome, and described second setting value is more than described first setting value；
If described optimum level of water is less than or equal to described water level deviator with the difference of described show value, with described second setting value
Increase the flow that adds water of described boiler-steam dome；
If described show value is less than described water level deviator or described optimal water with the difference of the optimum level of water of described boiler-steam dome
Position is more than described water level deviator with the difference of described show value, and execution determines whether described show value is equal to described boiler-steam dome
The step of optimum level of water.
4. the method for claim 1 is it is characterised in that determine described pot according to the steam pressure obtaining and vapor (steam) temperature
The steam specific volume of stove drum, specifically includes:
Steam specific volume v according to the following equation described boiler-steam dome of calculating:
P is steam pressure, and t is vapor (steam) temperature；
Described instantaneous quality of steam is calculated according to the steam specific volume of described boiler-steam dome, steam flow and quality coefficient, specifically
Including:
Described instantaneous quality of steam m:m=kv/v is calculated according to following equation, k is quality coefficient, v is steam flow.
5. a kind of water-level control apparatus of boiler-steam dome are it is characterised in that include:
Acquiring unit, for obtaining the show value of the water-level gauge of described boiler-steam dome with setting cycle；
First determining unit, for determining whether described show value is equal to the optimum level of water of described boiler-steam dome；
First computing unit, if be not equal to the optimum level of water of described boiler-steam dome for described show value, calculates described boiler vapour
Instantaneously add water quality and the instantaneous quality of steam of bag；
Control unit, if being more than described instantaneous quality of steam for the described quality that instantaneously adds water, reduces institute with the first setting value
State the flow that adds water of boiler-steam dome；If the described quality that instantaneously adds water is less than described instantaneous quality of steam, with the described first setting
Value increases the flow that adds water of described boiler-steam dome；
Wherein, described first computing unit, specifically for:
Obtain steam pressure, vapor (steam) temperature and the steam flow of described boiler-steam dome；
Determine the steam specific volume of described boiler-steam dome according to the steam pressure obtaining and vapor (steam) temperature；
Described instantaneous quality of steam is calculated according to the steam specific volume of described boiler-steam dome, steam flow and quality coefficient.
6. device as claimed in claim 5 is it is characterised in that also include the second determining unit, for determining described show value
With the maximum stage of described boiler-steam dome and the relation of lowest water level；
Described control unit, if being additionally operable to described show value to be more than or equal to described maximum stage, is reduced with the second setting value
The flow that instantaneously adds water of described boiler-steam dome, described second setting value is more than described first setting value；If described show value is less than
Or be equal to described lowest water level, then increase the flow that instantaneously adds water of described boiler-steam dome with described second setting value；If described aobvious
Indicating value, between described maximum stage and described lowest water level, turns to described first determining unit.
7. device as claimed in claim 5 is it is characterised in that also include the second computing unit and the 3rd determining unit, wherein:
Described second computing unit, for calculating the half of the maximum stage of described boiler-steam dome and the difference of lowest water level, obtains
To water level deviator；
Described 3rd determining unit, for determining the optimum level of water of described show value and described boiler-steam dome and described water level deviator
Relation；
Described control unit, if the difference being additionally operable to described show value with the optimum level of water of described boiler-steam dome is more than or equal to institute
State water level deviator, then reduce the flow that adds water of described boiler-steam dome with the second setting value, described second setting value is more than described the
One setting value；If described optimum level of water is less than or equal to described water level deviator with the difference of described show value, with described second
Setting value increases the flow that adds water of described boiler-steam dome；If described show value is little with the difference of the optimum level of water of described boiler-steam dome
It is more than described water level deviator in described water level deviator or described optimum level of water with the difference of described show value, execution determines institute
State the step whether show value is equal to the optimum level of water of described boiler-steam dome.
8. device as claimed in claim 5 is it is characterised in that described first computing unit, specifically for:
Steam specific volume v according to the following equation described boiler-steam dome of calculating:
P is steam pressure, and t is vapor (steam) temperature；
Described instantaneous quality of steam m:m=kv/v is calculated according to following equation, k is quality coefficient, v is steam flow.
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