CN103133319B - A kind of condensing generator set Condensate Pump Frequency Conversion controlling method and system - Google Patents
A kind of condensing generator set Condensate Pump Frequency Conversion controlling method and system Download PDFInfo
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Abstract
This application discloses a kind of condensing generator set Condensate Pump Frequency Conversion controlling method and system, when frequency variator is in Liquid level pattern, by the water level of water regulating valve co-controlling oxygen-eliminating device on frequency variator and oxygen-eliminating device, frequency variator regulates its rotating speed to control the water level of oxygen-eliminating device.On oxygen-eliminating device, water main inlet control valve maintains certain aperture according to unit load; Under same load, therefore, when unit is the load up stage, the aperture of upper water main inlet control valve keeps comparatively small guide vane, when unit is the load down stage, upper water main inlet control valve keeps larger opening, simultaneously by two curve controlled folded during ascending, descending load, produce certain load space, avoid Smaller load to fluctuate the upper water regulating valve aperture frequent variations caused; Make the rotating speed of frequency variator lower, electric current is less, ensures that the output frequency of frequency variator is adjustable and in the scope of economy, reduce the energy consumption of frequency variator.
Description
Technical field
The application relates to Condensate Pump Frequency Conversion control technique field, particularly relates to a kind of condensing generator set Condensate Pump Frequency Conversion controlling method and system.
Background technique
Condensate pump is the important motivity equipment of condensate system, sends in oxygen-eliminating device after its role is to that the water of condensation in steamer is squeezed into low-pressure heater heating.
Condensate Pump Frequency Conversion control is a kind of method of operation of condensate pump, condensate pump frequency of supply is changed, by realizing the automatic adjustment of condensate pump motor rotation speed to the conversion of frequency of supply by situations such as actual condensing water flow, water of condensation main-piping pressure, unit loads.
Controlling corresponding with Condensate Pump Frequency Conversion is condensate pump industrial frequency control, and industrial frequency control refers to that the fixing ac frequency of employing one runs, and be 50HZ in China, under power frequency operation pattern, the rotating speed that condensate pump motor runs is changeless.
In traditional thermal power generation unit Condensate Pump Frequency Conversion control mode, frequency variator only controls condensate pump outlet main-piping pressure, because heat pump sealing water is provided by water of condensation miscellaneous water, pipeline is longer, and therefore, water of condensation main-piping pressure must maintain high pressure and run, Frequency Converter Control water of condensation delivery side of pump main-piping pressure is large, the rotating speed of condensate pump motor is high, electric current is large, and therefore, energy-saving effect is poor.
Prior art deaerator level is by water main inlet control valve on oxygen-eliminating device, modulating valve co-controlling auxiliary with upper water, change along with the change of unit load and condensing water flow etc., main-piping pressure variable effect is exported larger by frequency variator rotating speed and condensate pump, for the Condensate Pump Frequency Conversion method of operation, when power frequency operation mode switches, condensate pump outlet main-piping pressure changes greatly, frequency variator pressure regulation circuit can not respond rapidly, therefore, in pipeline, throttling increases, simultaneously, also the control of water regulating valve to deaerator level is unfavorable for, at unit load changes phase, deaerator level fluctuation is larger, pure upper water regulating valve controls slowly, poor effect.Throttling refers to that fluid flows in pipeline, runs into the section narrowed suddenly, owing to there is the phenomenon that resistance makes the pressure of fluid reduce.
In addition, when running into condensate system boost in pressure demand, frequency variator will carry out frequency conversion lifting, and condensate pump outlet main-piping pressure improves rapidly, comparatively large on deaerator level impact, and the control of water regulating valve on oxygen-eliminating device is affected.
Because the sealing water of heat pump water-sealed pump is provided by water of condensation miscellaneous water, directly by the impact of water of condensation pressure, flow, and heat pump sealing coolant-temperature gage regulates just simple single loop to regulate, when the situations such as condensate system generation boost in pressure needs cause condensate pump to export main-piping pressure change, heat pump sealing coolant-temperature gage regulating loop will cause larger rocking, and has a strong impact on unit operation and stablizes.
Summary of the invention
For solving the problems of the technologies described above, the embodiment of the present application provides a kind of condensing generator set Condensate Pump Frequency Conversion controlling method and system, automatically switch to realize the control of frequency variator to condensate pump outlet main-piping pressure and deaerator level, reduce Condensate Pump Frequency Conversion electric current, thus reduce power consumption, technological scheme is as follows:
The application provides a kind of condensing generator set Condensate Pump Frequency Conversion controlling method, be applied to Condensate Pump Frequency Conversion control system, described system comprises frequency variator, condensate pump, motor and oxygen-eliminating device, described frequency variator can switch between Liquid level pattern and pressure control mode, described Liquid level pattern is for controlling deaerator level, described pressure control mode is for controlling condensate pump outlet main-piping pressure, and described method comprises:
When described frequency variator is in Liquid level pattern, the water level of oxygen-eliminating device is controlled by Frequency Converter Control rotating speed, the upper water main inlet control valve of oxygen-eliminating device maintains certain aperture according to the load condition of unit, and linearly control mode: when unit load is the load up stage, the aperture that opening curve regulates water main inlet control valve on oxygen-eliminating device is preset according to first, when unit load is the load down stage, the aperture that opening curve regulates water main inlet control valve on oxygen-eliminating device is preset according to second, wherein, described first presets opening curve opening value is less than the described second default opening curve opening value in low load stage, wherein, described low load stage is between the loading zone of less than 50%.
Preferably, when frequency variator is in pressure control mode, described frequency variator switches to pressure control mode from Liquid level pattern automatically, according to load instruction controlling curve, oxygen-eliminating device pressure and the first predefined value sum, and described load instruction controlling curve and boost in pressure curve sum, determine the pressure set points of described frequency variator, tachometer value corresponding to described pressure set points is reached to make the rotating speed of frequency variator, wherein, described load instruction controlling curve is export according to unit load and condensate pump the curve that the corresponding relation between main-piping pressure obtains; Described boost in pressure curve is the curve that unit load and condensate pump export the corresponding relation between main-piping pressure correction value and obtain.
Preferably, the deterministic process of described pressure set points specifically comprises:
By described load instruction controlling curve, oxygen-eliminating device pressure and the first predefined value sum, and described load instruction controlling curve and boost in pressure curve sum, carry out maximizing operation, obtain the Pressure maximum value that current loads is corresponding;
Described Pressure maximum value and bias set value summation operation, obtain the first force value, and described bias set value pre-determines according to the operating conditions of described generator set;
The second force value is obtained after described first force value is carried out rate limit;
Described first force value and described second force value are carried out getting computing, using the maximum value that obtains as pressure set points.
Preferably, when frequency variator switches to Liquid level pattern from pressure control mode, on oxygen-eliminating device, water main inlet control valve regulates aperture according to the rate of change that opening degree instruction is corresponding, the rate of change that described opening degree instruction is corresponding is different default regulations speeds corresponding to the different opening of described upper water main inlet control valve, and aperture is less, corresponding default regulations speed is larger.
Preferably, after condensate system produces boost in pressure demand, on described oxygen-eliminating device, the override of water main inlet control valve closes aperture is under power frequency operation pattern, the difference between the aperture of the described upper water main inlet control valve that unit load instruction is corresponding and the aperture of the auxiliary modulating valve of revised upper water.
Preferably, the low side pressure in condensate system promotes and comprises: open high side valve soon, open low side valve and low side valve opening degree instruction is greater than 5%, and the boost in pressure signal reset when low side valve opening degree instruction is less than 3%.
The application also provides a kind of condensing generator set Condensate Pump Frequency Conversion control system, comprising: the auxiliary modulating valve of water and deaerator level on water main inlet control valve, oxygen-eliminating device on condensate pump, frequency variator, oxygen-eliminating device, wherein:
Described frequency variator can switch between Liquid level pattern and pressure control mode, and described pressure control mode is for controlling described condensate pump outlet main-piping pressure, and described Liquid level pattern is for controlling the water level of described oxygen-eliminating device;
When described frequency variator is in Liquid level pattern, by frequency variator adjusting rotary speed, to control the water level of oxygen-eliminating device, the upper water main inlet control valve of oxygen-eliminating device maintains certain aperture according to the load condition of unit, and linearly control mode: when unit load is the load up stage, on oxygen-eliminating device, the aperture of water main inlet control valve presets opening curve adjustment according to first, when unit load is the load down stage, on oxygen-eliminating device, the aperture of water main inlet control valve presets opening curve adjustment according to second, wherein, described first presets opening curve is less than the described second default opening curve in low load stage, wherein, described low load stage is between the loading zone of less than 50%.
Preferably, when condensate system produces boost in pressure demand, described frequency variator switches to pressure control mode from Liquid level pattern automatically, the controller of described frequency variator is according to load instruction controlling curve value, oxygen-eliminating device pressure and the first predefined value sum, and described load instruction controlling curve value and boost in pressure curve values sum, determine the pressure set points of described frequency variator, wherein, described load instruction controlling curve is export according to unit load and condensate pump the curve that the corresponding relation between main-piping pressure obtains; Described boost in pressure curve is the curve that unit load and condensate pump export the corresponding relation between main-piping pressure correction value and obtain;
After condensate system produces boost in pressure demand, on described oxygen-eliminating device, the override of water main inlet control valve closes aperture is under power frequency operation pattern, the aperture of the described upper water main inlet control valve that unit load instruction is corresponding and the difference of the revised aperture of the auxiliary control valve opening of upper water.
Preferably, described controller specifically for:
By described load instruction controlling curve, oxygen-eliminating device pressure and the first predefined value sum, and described load instruction controlling curve value and boost in pressure curve values sum, carry out maximizing operation, obtain the Pressure maximum value that current loads is corresponding;
Described Pressure maximum value and bias set value summation operation, obtain the first force value, and described bias set value pre-determines according to the operating conditions of described generator set;
The second force value is obtained after described first force value is carried out rate limit;
Described first force value and described second force value are carried out maximizing operation, using the maximum value that obtains as pressure set points.
Preferably, the low side pressure in condensate system promotes and comprises: open high side valve soon, open low side valve and low side valve opening degree instruction is greater than 5%, and the boost in pressure signal reset when low side valve opening degree instruction is less than 3%.
The technological scheme provided from above the embodiment of the present application, condensing generator set Condensate Pump Frequency Conversion controlling method, when frequency variator is in Liquid level pattern, by the water level of water regulating valve co-controlling oxygen-eliminating device on frequency variator and oxygen-eliminating device, its rotating speed is regulated by frequency variator, and then controlling the water level of oxygen-eliminating device, the main inlet control valve on oxygen-eliminating device maintains certain aperture according to unit load situation; Under same load, when load up, because the cracking pressure of upper water main inlet control valve is slightly less than the closing pressure of water main inlet control valve upper during load down, therefore, when same load, when unit load is the load up stage, on oxygen-eliminating device, the aperture of water main inlet control valve keeps comparatively small guide vane, when unit load is the load down stage, on oxygen-eliminating device, water main inlet control valve keeps larger opening.Simultaneously by ascending, descending load two curve controlled folded, produce certain load space, Smaller load can be avoided to fluctuate the upper water regulating valve aperture frequent variations caused; Can ensure after solidifying pump degree of depth Frequency Conversion Modification that the output frequency of frequency variator is adjustable and in the scope of economy, make the rotating speed of frequency variator lower, and then the electric current of frequency variator is less, significantly reduces the energy consumption of frequency variator.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technological scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The flow chart of a kind of condensing generator set Condensate Pump Frequency Conversion controlling method that Fig. 1 provides for the embodiment of the present application;
The main electric loop wiring schematic diagram of solidifying pump frequency conversion that Fig. 2 provides for the embodiment of the present application;
The structural representation of the condensate system that Fig. 3 provides for the embodiment of the present application;
The opening curve figure of the upper water main inlet control valve of the corresponding oxygen-eliminating device of unit load instruction that Fig. 4 provides for the embodiment of the present application;
The pressure set points that Fig. 5 provides for the embodiment of the present application realize block diagram.
Embodiment
The embodiment of the present application provides a kind of condensing generator set Condensate Pump Frequency Conversion controlling method, be applied to Condensate Pump Frequency Conversion control system, described system comprises frequency variator, condensate pump, motor and oxygen-eliminating device, wherein, described frequency variator can automatically switch between Liquid level pattern and pressure control mode, described Liquid level pattern is the water level controlling oxygen-eliminating device, and described pressure control mode is for controlling condensate pump outlet main-piping pressure; Refer to Fig. 1, said method comprising the steps of:
101, when described frequency variator is in Liquid level pattern, controlled the water level of described oxygen-eliminating device by the upper water regulating valve of frequency variator and oxygen-eliminating device.
Wherein, described upper water regulating valve comprises water main inlet control valve and the auxiliary modulating valve of upper water.
Concrete, frequency variator controls the water level of oxygen-eliminating device by controlling rotating speed, the upper water main inlet control valve of oxygen-eliminating device maintains certain aperture according to the load condition of unit, and linearly control mode, be specially the change of the aperture random group load of described upper water main inlet control valve and change, when unit load is the load up stage, on oxygen-eliminating device, the aperture of water main inlet control valve presets opening curve adjustment according to first, when unit load is the load down stage, on oxygen-eliminating device, the aperture of water main inlet control valve presets opening curve adjustment according to second, wherein, between low load region, (< 50% load) described first is preset opening curve value and is less than described second and presets opening curve value.
102, when described frequency variator is in pressure control mode, described frequency variator switches to pressure control mode from Liquid level pattern automatically, according to load instruction controlling curve, oxygen-eliminating device pressure and the first predefined value sum, and described load instruction controlling curve and boost in pressure curve sum, determine the pressure set points of described frequency variator, reach tachometer value corresponding to described pressure set points to make the rotating speed of frequency variator.
Wherein, described load instruction controlling curve is export according to unit load and condensate pump the curve that the corresponding relation between main-piping pressure obtains; Described boost in pressure curve is the curve that unit load and condensate pump export the corresponding relation between main-piping pressure correction value and obtain.
The condensing generator set Condensate Pump Frequency Conversion controlling method that the present embodiment provides, when frequency variator is in Liquid level pattern, by the water level of water regulating valve co-controlling oxygen-eliminating device on frequency variator and oxygen-eliminating device, frequency variator regulates its rotating speed to control the water level of oxygen-eliminating device; On oxygen-eliminating device, water main inlet control valve maintains certain aperture according to unit load situation; Under same load, on when load up, the cracking pressure of water main inlet control valve is slightly less than the closing pressure of water main inlet control valve on during load down, therefore, under same load, when unit is in the load up stage, on oxygen-eliminating device, the aperture of water main inlet control valve keeps comparatively small guide vane, and when unit is the load down stage, on oxygen-eliminating device, water main inlet control valve keeps larger opening.Meanwhile, by two curve controlled folded during ascending, descending load, produce certain load space, Smaller load can be avoided to fluctuate the control valve opening frequent variations caused; After optimization control, the rotating speed of frequency variator is lower, and electric current is less, and ensures that the output frequency of frequency variator is adjustable and in the scope of economy, significantly reduce the energy consumption of frequency variator.
Being more than the core concept of the application, in order to make those skilled in the art person understand the application's scheme better, below in conjunction with accompanying drawing, the application being described in further detail.
The condensing generator set Condensate Pump Frequency Conversion control system that the embodiment of the present application provides, described system comprises condensate pump, frequency variator, motor and oxygen-eliminating device, refer to Fig. 2, described motor M1 is connected with condensate pump A, described condensate pump A is connected with frequency variator 101 by outlet isolating switch K2, frequency variator 101 is by connecting 6kVA1 section bus after feed isolating switch K1 and circuit breaker Q S1 series connection, and meanwhile, condensate pump A is connected with circuit breaker Q S1 by bypass isolating switch K3; Motor M2 is connected with condensate pump B, and condensate pump B connects 6kVA2 section bus by circuit breaker Q S2.
Refer to Fig. 3, the water outlet of vapour condenser 201 connects condensate pump A and B simultaneously, and condensate pump A with B is connected gland heater 202, and the water outlet of gland heater 202 is connected oxygen-eliminating device 205 by the auxiliary modulating valve 204 of upper water main inlet control valve 203 and upper water.Meanwhile, the water outlet of gland heater 202 also connects the water intake of vapour condenser 201 by condensate pump recirculation (egr) valve 206.
When condensing generator set condensate system is at normal operating condition, condensate pump is in Liquid level pattern, and the water level of oxygen-eliminating device is by water supply valve and frequency variator co-controlling, and on oxygen-eliminating device, the auxiliary modulating valve of water keeps comparatively small guide vane to carry out auxiliary adjustment.
On oxygen-eliminating device, water main inlet control valve has two kinds of control modes, linear mode control and Liquid level pattern respectively, wherein, when condensate system is in normal operating condition, on oxygen-eliminating device, water main inlet control valve is in linear mode control, refer to that water main inlet control valve remains on certain aperture, and its aperture changes with the change of load.When frequency variator switches to frequency conversion operating mode from power frequency operating mode, on oxygen-eliminating device, water main inlet control valve is in Liquid level pattern, and namely on oxygen-eliminating device, the aperture of water main inlet control valve is slowly adjusted to the value of frequency variator under Liquid level pattern.
Concrete, when condensate system is in normal operating phase, on oxygen-eliminating device, water main inlet control valve is in linear mode control, is jointly regulated the water level of oxygen-eliminating device by frequency variator and the auxiliary modulating valve of described upper water.The aperture random group load (condensing water flow) of described upper water main inlet control valve changes and changes, and in the load up stage, presets according to first the aperture that opening curve regulates upper water main inlet control valve; In the load down stage, preset according to second the aperture that opening curve regulates upper water main inlet control valve.
Can matching obtain in the process of Frequency Converter Control deaerator level by test, the curve of the aperture of water main inlet control valve on the corresponding oxygen-eliminating device of load instruction, different unit needs to adjust according to actual conditions, please refer to table 1 and Fig. 4, Figure 4 shows that the opening curve figure of the upper water main inlet control valve of the corresponding oxygen-eliminating device of unit load instruction that the embodiment of the present application provides, in figure, △ represents the aperture adjustment curve of the upper water main inlet control valve that load up process is corresponding, and represents the aperture adjustment curve of the upper water main inlet control valve that load down process is corresponding.
Table 1
Under the prerequisite ensureing condensate system and stable operation of unit pressure, the aperture of the upper water main inlet control valve that a certain load instruction is corresponding, keeps comparatively small guide vane in load up process, in load down process, keeps larger opening.Such as, when load is 100MW, if be in load up process, then the aperture going up water main inlet control valve is 17%, if be in load down process, then the aperture going up water main inlet control valve is 18%.
In the condensing generator set Condensate Pump Frequency Conversion control system that the application provides, when frequency variator switches to Liquid level pattern from pressure control mode, the tachometer value that the rotating speed of frequency variator is corresponding under returning to current loads gradually, on oxygen-eliminating device, water main inlet control valve is also adjusted to frequency variator opening value corresponding under Liquid level pattern gradually.More stable for making condensate system run, the rate variation that on employing oxygen-eliminating device, water main inlet control valve opening degree instruction is corresponding regulates the aperture of described upper water main inlet control valve, the aperture of this rate value and upper water main inlet control valve is inversely proportional to, thus ensure that water main inlet control valve reduces throttling when low aperture as far as possible, thus decrease the energy consumption that throttling causes, and then strengthen the stability of system.
The rate variation that described water main inlet control valve opening degree instruction is corresponding is specifically as shown in table 2:
Table 2
As seen from the above table, the aperture regulations speed value of upper water main inlet control valve and the aperture of upper water main inlet control valve are inversely proportional to, and the aperture namely going up water main inlet control valve is larger, and regulations speed is less.
Refer to Fig. 5, what show the pressure set points that the embodiment of the present application provides realizes block diagram.When unit load is below 20%, or when frequency variator is in pressure control mode, deaerator level is controlled by water regulating valve on oxygen-eliminating device, Frequency Converter Control condensate pump outlet main-piping pressure.
Concrete, operator are according to the manual incoming pressure setting value of the load condition of unit, and described pressure set points obtains according to the compute mode shown in Fig. 5.
Load instruction curve f (LD) 201, boost in pressure curve f (LD2) are carried out maximizing operation 204 with load instruction curve sum (i.e. f (LD)+f (LD2)) 202, oxygen-eliminating device pressure P and the first predefined value sum (i.e. P+0.3MPa) 203, from three, select the maximum value in a certain load instruction corresponding pressure value, obtain the first force value.
Wherein, when described boost in pressure curve f (LD2) is for condensate system generation boost in pressure demand, the lifting curve of the frequency variator rotating speed that different load instruction is corresponding, obtain the data shown in table 3 by test, the frequency variator rotary speed instruction in table 3 is the percentage of the rated speed of frequency variator.
Table 3
| Load instruction (MW) | Frequency variator rotary speed instruction (%) |
| 0 | 40 |
| 20 | 42.5 |
| 50 | 44 |
| 75 | 45 |
| 100 | 50 |
First force value is added upper offset 205 and obtains the second force value, the second force value is carried out rate limit computing 206 and carries out maximizing operation 207 with described second force value, obtain higher value as final pressure set points.
Like this, when condensate system produces boost in pressure demand, adopt the structured flowchart shown in Fig. 4, pressure set points corresponding under calculating a certain load, can make water of condensation delivery side of pump main-piping pressure promote rapidly, improves the speed of response of system; And can slowly approach during pressure drop adjustment, thus achieving pressure controlled quick and stability, the phenomenon of toning when preventing pressure from regulating downwards occurs, and condensate system is run more stable.
When frequency variator is not in Liquid level pattern, the water level of oxygen-eliminating device is by water main inlet control valve on oxygen-eliminating device and the auxiliary governor valve control of upper water, below for 600MW supercritical unit, when load is less than 120MW, the auxiliary control valve opening of described upper water keeps complete shut-down, when load is less than 295MW, keep comparatively small guide vane, when load is greater than 330MW, aperture increases, participation deaerator level regulates, and deaerator level regulates primarily of upper water main inlet control valve.
After condensate system produces boost in pressure demand, deaerator level is controlled by water regulating valve on oxygen-eliminating device, it is water main inlet control valve aperture on the corresponding oxygen-eliminating device of load instruction under power frequency operation pattern that upper water main inlet control valve override closes aperture, with the difference of the revised aperture of the auxiliary control valve opening of upper water.
Wherein, when above-mentioned override refers to that condensate system produces boost in pressure demand, frequency variator rotating speed is promoted to rapidly current loads tachometer value corresponding under power frequency operation mode, and on oxygen-eliminating device, water main inlet control valve closes rapidly the upper auxiliary control valve opening value of water after revising corresponding to current loads to power frequency operation operating mode.
Concrete, under power frequency operation pattern, on the corresponding oxygen-eliminating device of load instruction, the aperture of water main inlet control valve is specifically as shown in table 4.
Table 4
| Load instruction (MW) | Upper water main inlet control valve aperture (%) |
| 0 | 16 |
| 200 | 20 |
| 400 | 25 |
| 500 | 27 |
| 600 | 30 |
In whole service process, on oxygen-eliminating device, the auxiliary modulating valve of water is all coming into operation, and aperture increases along with the rising of load instruction, therefore need to revise the aperture of the auxiliary modulating valve of upper water, namely according to PID output order during deaerator level three blunt quantity control, the auxiliary modulating valve of upper water is revised.Concrete correction data are as shown in table 5.
Table 5
Illustrate that on oxygen-eliminating device, water main inlet control valve override closes the procurement process of aperture with a concrete example below, suppose that load is 600MW, during converting operation, on oxygen-eliminating device, the aperture of water main inlet control valve is 85%, during power frequency operation, the aperture of the upper water main inlet control valve that 600MW load is corresponding is 30%, the auxiliary modulating valve of upper water standard-sized sheet under 600MW load, the aperture correction value of the auxiliary modulating valve of upper water is 12%, therefore the override pass aperture going up water main inlet control valve is 30%-12%=18%, and the aperture namely going up water main inlet control valve is closed to 18% from 85% override.
After condensate system produces boost in pressure demand, the rotating speed of frequency variator promotes, on oxygen-eliminating device, water main inlet control valve override closes, the aperture that override closes is water main inlet control valve aperture on the corresponding oxygen-eliminating device of load instruction under power frequency operation pattern, with the difference of the revised aperture of the auxiliary control valve opening of upper water, make the aperture of water main inlet control valve and the rotational speed matches of frequency variator, the speed that upper water main inlet control valve is closed is coordinated mutually with the speed that frequency variator promotes, avoid the significantly change of deaerator level, thus reduce the disturbance of deaerator level to condensate pump outlet main-piping pressure, condensate system is run more stable.
In addition, when any one situation following occurs, rotating speed corresponding during power frequency operation under frequency variator override to current loads, and control condensate pump outlet main-piping pressure, the difference of corresponding upper water main inlet control valve aperture and the revised value of aperture of upper water auxiliary modulating valve when the aperture override of water main inlet control valve closes power frequency operation operating mode to current loads on oxygen-eliminating device, the control of deaerator level adjusts valve control to be conducive to more accurately positioning control to upper water main inlet control valve by water on oxygen-eliminating device.
1) any outlet temperature of low voltage bypass A/B is higher than 120 DEG C;
2) any little unit sealing water return water temperature any point is higher than 75 DEG C (when lower than 70 DEG C of resets);
When sealing water return water temperature lower than 70 DEG C, no longer trigger condensate system trouble signal and reset, namely described frequency variator is without the need to override to power frequency operation mode, is still in Liquid level mode, namely controls the water level of oxygen-eliminating device.3) low voltage bypass is in boost in pressure pattern;
4) frequency variator is in operation, arbitrary condensate pump in power frequency operation mode and on oxygen-eliminating device water main inlet control valve operate in automated manner, described automated manner refers to that water main inlet control valve utilizes PID(ProportionIntegrationDifferentiation according to the deviation between deaerator level setting value and the water level actual value of oxygen-eliminating device, proportional-integral-differential) control mode automatic control water level, make it reach water level settings value.
The application has carried out clear and definite definition to the low voltage bypass boost in pressure in condensate system boost in pressure demand, comprise open high side valve soon, open low side valve, low other opening degree instruction is greater than 5% 3 kind of situation, and when low other opening degree instruction is less than 3%, low side valve boost in pressure signal resets, namely boost in pressure is not carried out, greatly reduce the consumption of steam, improve the performance of unit.
In the condensing generator set Condensate Pump Frequency Conversion control system that the application provides, thered is provided by water of condensation owing to giving pump seal water, therefore give the temperature of pump seal water larger by condensate pump outlet main-piping pressure variable effect, especially when switchable pump and condensate system produce boost in pressure demand, pid parameter corrective action is not obvious, therefore, control giving pump seal coolant-temperature gage to increase condensate pump outlet main-piping pressure feed-forward loop, namely, when condensate pump outlet main-piping pressure is higher, reduce sealing coolant-temperature gage and adjust valve instruction; When condensate pump outlet main-piping pressure is lower, increases sealing coolant-temperature gage and adjust valve instruction, to reduce the amplitude of sealing coolant-temperature gage change as far as possible, realize controlling the fast and stable of sealing coolant-temperature gage, improve the stability of condensate system simultaneously.
After sealing coolant-temperature gage control increase condensate pump outlet main-piping pressure feed-forward loop, the range of temperature of sealing water is lower, and regulate more rapidly, condensate system is more stable.
In sum, take capacity as the unit of 600MW be example, from unit starting to oepration at full load process, on frequency variator VP, oxygen-eliminating device, on water main inlet control valve MV, oxygen-eliminating device, the state of a control of water auxiliary modulating valve AV is as shown in table 6:
Table 6
In upper table
arranging when load closes loop fast lower than having during 295MW in presentation logic, making the auxiliary modulating valve of water on oxygen-eliminating device keep comparatively small guide vane;
representing when load is higher than there being fast open loop during 330MW, making the auxiliary modulating valve of water on oxygen-eliminating device increase aperture, making it better to regulate water level.
It should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or control panel, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.
The above is only the embodiment of the application; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the application's principle; can also make some improvements and modifications, these improvements and modifications also should be considered as the protection domain of the application.
Claims (2)
1. a condensing generator set Condensate Pump Frequency Conversion controlling method, be applied to Condensate Pump Frequency Conversion control system, described system comprises frequency variator, condensate pump, motor and oxygen-eliminating device, it is characterized in that, described frequency variator can switch between Liquid level pattern and pressure control mode, described Liquid level pattern is for controlling deaerator level, and described pressure control mode is for controlling condensate pump outlet main-piping pressure, and described controlling method comprises:
When described frequency variator is in Liquid level pattern, the water level of oxygen-eliminating device is controlled by Frequency Converter Control rotating speed, the upper water main inlet control valve of oxygen-eliminating device maintains certain aperture according to the load condition of unit, and linearly control mode: when unit load is the load up stage, the aperture that opening curve regulates water main inlet control valve on oxygen-eliminating device is preset according to first, when unit load is the load down stage, the aperture that opening curve regulates water main inlet control valve on oxygen-eliminating device is preset according to second, wherein, described first presets opening curve opening value is less than the described second default opening curve opening value in low load stage, wherein, described low load stage is between the loading zone of less than 50%,
Wherein, also comprise:
When frequency variator is in pressure control mode, described frequency variator switches to pressure control mode from Liquid level pattern automatically, according to load instruction controlling curve, oxygen-eliminating device pressure and the first predefined value sum, and described load instruction controlling curve and boost in pressure curve sum, determine the pressure set points of described frequency variator, tachometer value corresponding to described pressure set points is reached to make the rotating speed of frequency variator, wherein, described load instruction controlling curve is export according to unit load and condensate pump the curve that the corresponding relation between main-piping pressure obtains; Described boost in pressure curve is the curve that unit load and condensate pump export the corresponding relation between main-piping pressure correction value and obtain;
The deterministic process of described pressure set points specifically comprises:
By described load instruction controlling curve, oxygen-eliminating device pressure and the first predefined value sum, and described load instruction controlling curve and boost in pressure curve sum, carry out maximizing operation, obtain the Pressure maximum value that current loads is corresponding;
Described Pressure maximum value and bias set value summation operation, obtain the first force value, and described bias set value pre-determines according to the operating conditions of described generator set;
The second force value is obtained after described first force value is carried out rate limit;
Described first force value and described second force value are carried out getting computing, using the maximum value that obtains as pressure set points;
Described controlling method also comprises: when frequency variator switches to Liquid level pattern from pressure control mode, on oxygen-eliminating device, water main inlet control valve regulates aperture according to the rate of change that opening degree instruction is corresponding, the rate of change that described opening degree instruction is corresponding is different default regulations speeds corresponding to the different opening of described upper water main inlet control valve, and aperture is less, corresponding default regulations speed is larger;
Described controlling method also comprises: after condensate system produces boost in pressure demand, on described oxygen-eliminating device, the override of water main inlet control valve closes aperture is under power frequency operation pattern, the difference between the aperture of the described upper water main inlet control valve that unit load instruction is corresponding and the aperture of the auxiliary modulating valve of revised upper water;
Wherein, when described override refers to that condensate system produces boost in pressure demand, frequency variator rotating speed is promoted to rapidly current loads tachometer value corresponding under power frequency operation mode, and on oxygen-eliminating device, water main inlet control valve closes rapidly the upper auxiliary control valve opening value of water after revising corresponding to current loads to power frequency operation operating mode;
Low side pressure in condensate system promotes and comprises: open high side valve soon, open low side valve and low side valve opening degree instruction is greater than 5%, and the boost in pressure signal reset when low side valve opening degree instruction is less than 3%;
Wherein, the aperture of PID output order to the auxiliary modulating valve of upper water when also comprising foundation deaerator level three blunt quantity control in described controlling method is revised.
2. a condensing generator set Condensate Pump Frequency Conversion control system, is characterized in that, comprising: the auxiliary modulating valve of water and oxygen-eliminating device on water main inlet control valve, oxygen-eliminating device on condensate pump, frequency variator, oxygen-eliminating device, wherein:
Described frequency variator can switch between Liquid level pattern and pressure control mode, and described pressure control mode is for controlling described condensate pump outlet main-piping pressure, and described Liquid level pattern is for controlling the water level of described oxygen-eliminating device;
When described frequency variator is in Liquid level pattern, by frequency variator adjusting rotary speed, to control the water level of oxygen-eliminating device, the upper water main inlet control valve of oxygen-eliminating device maintains certain aperture according to the load condition of unit, and linearly control mode: when unit load is the load up stage, on oxygen-eliminating device, the aperture of water main inlet control valve presets opening curve adjustment according to first, when unit load is the load down stage, on oxygen-eliminating device, the aperture of water main inlet control valve presets opening curve adjustment according to second, wherein, described first presets opening curve is less than the described second default opening curve in low load stage, wherein, described low load stage is between the loading zone of less than 50%,
Wherein,
When condensate system produces boost in pressure demand, described frequency variator switches to pressure control mode from Liquid level pattern automatically, the controller of described frequency variator is according to load instruction controlling curve value, oxygen-eliminating device pressure and the first predefined value sum, and described load instruction controlling curve value and boost in pressure curve values sum, determine the pressure set points of described frequency variator, wherein, described load instruction controlling curve is export according to unit load and condensate pump the curve that the corresponding relation between main-piping pressure obtains; Described boost in pressure curve is the curve that unit load and condensate pump export the corresponding relation between main-piping pressure correction value and obtain;
Described controller specifically for:
By described load instruction controlling curve, oxygen-eliminating device pressure and the first predefined value sum, and described load instruction controlling curve value and boost in pressure curve values sum, carry out maximizing operation, obtain the Pressure maximum value that current loads is corresponding;
Described Pressure maximum value and bias set value summation operation, obtain the first force value, and described bias set value pre-determines according to the operating conditions of described generator set;
The second force value is obtained after described first force value is carried out rate limit;
Described first force value and described second force value are carried out maximizing operation, using the maximum value that obtains as pressure set points;
Wherein, when frequency variator switches to Liquid level pattern from pressure control mode, on oxygen-eliminating device, water main inlet control valve regulates aperture according to the rate of change that opening degree instruction is corresponding, the rate of change that described opening degree instruction is corresponding is different default regulations speeds corresponding to the different opening of described upper water main inlet control valve, and aperture is less, corresponding default regulations speed is larger; After condensate system produces boost in pressure demand, on described oxygen-eliminating device, the override of water main inlet control valve closes aperture is under power frequency operation pattern, the aperture of the described upper water main inlet control valve that unit load instruction is corresponding and the difference of the revised aperture of the auxiliary control valve opening of upper water;
Wherein, when described override refers to that condensate system produces boost in pressure demand, frequency variator rotating speed is promoted to rapidly current loads tachometer value corresponding under power frequency operation mode, and on oxygen-eliminating device, water main inlet control valve closes rapidly the upper auxiliary control valve opening value of water after revising corresponding to current loads to power frequency operation operating mode;
Low side pressure in condensate system promotes and comprises: open high side valve soon, open low side valve and low side valve opening degree instruction is greater than 5%, and the boost in pressure signal reset when low side valve opening degree instruction is less than 3%;
Wherein, revise according to the aperture of PID output order to the auxiliary modulating valve of upper water during deaerator level three blunt quantity control.
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