CN103133319A - Frequency converting control method and system of condensate pump of condensed steam generator set - Google Patents
Frequency converting control method and system of condensate pump of condensed steam generator set Download PDFInfo
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Abstract
The invention discloses a frequency converting control method and system of a condensate pump of a condensed steam generator set. When a frequency converter is in a liquid control mode, the water level of a deaerator is controlled by the frequency converter and a water adjusting valve on the deaerator, and the frequency converter controls the water level of the deaerator by adjusting the rotating speed. A water feeding main adjusting valve on the deaerator is maintained at certain aperture according to the load of a machine unit; and under the same load, when the machine unit is in a load up stage, the aperture of the water feeding main adjusting valve is maintained to be small, and when the machine unit is in a load down stage, the aperture of the water feeding main adjusting valve is maintained to be large. Simultaneously certain load space can be generated by control of two clamped curves during load up and load down, and frequent aperture changing of the water feeding adjusting valve caused by small load fluctuation can be avoided. The rotating speed of the frequency converter can be lower, the current is small, the output frequency of the frequency converter is in the adjustable and economical range, and energy consumption of the frequency converter is reduced.
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 the water of condensation in steamer is squeezed into the low-pressure heater heating.
It is a kind of method of operation of condensate pump that Condensate Pump Frequency Conversion is controlled, change the condensate pump frequency of supply by situations such as actual condensing water flow, water of condensation main-piping pressure, unit loads, realize the automatic adjusting of condensate pump motor rotation speed by the conversion to frequency of supply.
Corresponding with Condensate Pump Frequency Conversion control is the condensate pump industrial frequency control, and industrial frequency control refers to adopt a fixing ac frequency operation, is 50HZ in China, and under the power frequency operation pattern, the rotating speed of condensate pump motor operation is changeless.
In traditional thermal power generation unit Condensate Pump Frequency Conversion control mode, frequency variator is only controlled condensate pump outlet main-piping pressure, because heat pump sealing water is provided by the water of condensation miscellaneous water, pipeline is longer, and therefore, the water of condensation main-piping pressure must be kept the high pressure operation, 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.
the prior art deaerator level is by water main inlet control valve on oxygen-eliminating device, with the auxiliary modulating valve co-controlling of upper water, change along with the variation of unit load and condensing water flow etc., be subjected to frequency variator rotating speed and condensate pump outlet main-piping pressure variable effect larger, for the Condensate Pump Frequency Conversion method of operation, when the power frequency operation mode is switched, condensate pump outlet main-piping pressure changes greatly, the frequency variator pressure regulation circuit can not respond rapidly, therefore, in pipeline, throttling increases, simultaneously, be unfavorable for that also water regulating valve is to the control of deaerator level, at the unit load changes phase, the deaerator level fluctuation is larger, pure upper water regulating valve is controlled slowly, poor effect.Throttling refers to that fluid flows, and runs into the section that narrows down suddenly, owing to existing resistance to make the phenomenon of the pressure decreased of fluid in pipeline.
In addition, when running into condensate system boost in pressure demand, frequency variator will carry out frequency conversion and promote, and condensate pump outlet main-piping pressure improves rapidly, and is larger on the deaerator level impact, make that on oxygen-eliminating device, the control of water regulating valve is affected.
Because the sealing water of heat pump water-sealed pump is provided by the water of condensation miscellaneous water, directly be subjected to the impact of water of condensation pressure, flow, and the adjusting of heat pump sealing coolant-temperature gage is that simple single loop is regulated, when the situations such as condensate system generation boost in pressure needs cause condensate pump outlet main-piping pressure to change, heat pump sealing coolant-temperature gage regulating loop will cause larger rocking, and have a strong impact on unit operation stable.
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, to realize that frequency variator automaticallyes switch to the control of condensate pump outlet main-piping pressure and deaerator level, reduce the Condensate Pump Frequency Conversion electric current, thereby reduced 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 the 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 control mode and pressure control mode, described liquid level control mode 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 the liquid level control mode, control the water level of oxygen-eliminating device by the 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 be the linearity control mode: when unit load is that load up is during the stage, aperture according to water main inlet control valve on the first default aperture curve adjustment oxygen-eliminating device, when unit load is that load down is during the stage, aperture according to water main inlet control valve on the second default aperture curve adjustment oxygen-eliminating device, wherein, the described first default aperture curve opening value is preset aperture curve opening value in low load stage less than described second, wherein, described low load stage is between loading zone below 50%.
Preferably, when frequency variator is in pressure control mode, described frequency variator is automatically from the liquid level control mode switch to pressure control mode, curve, oxygen-eliminating device pressure and the first predefined value sum are controlled in instruction according to load, and curve and boost in pressure curve sum are controlled in described load instruction, determine the pressure set points of described frequency variator, so that the rotating speed of frequency variator reaches tachometer value corresponding to described pressure set points, wherein, the curve of curve for obtaining according to the corresponding relation between unit load and condensate pump outlet main-piping pressure controlled in described load instruction; Described boost in pressure curve is the curve that the corresponding relation between unit load and condensate pump outlet main-piping pressure correction value obtains.
Preferably, definite process of described pressure set points specifically comprises:
Curve, oxygen-eliminating device pressure and the first predefined value sum are controlled in described load instruction, and described load instruction control curve and boost in pressure curve sum, get macrooperation, obtain when pressure maximum value corresponding to preload;
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;
Described the first force value is carried out obtaining the second force value after rate limit;
Described the first force value and described the second force value are got computing, with the maximum value that obtains as pressure set points.
Preferably, when frequency variator switches to the liquid level control mode from pressure control mode, on oxygen-eliminating device, the water main inlet control valve is regulated aperture according to rate of change corresponding to aperture instruction, rate of change corresponding to described aperture instruction is different default regulations speeds corresponding to the different opening of described upper water main inlet control valve, and aperture is less, and corresponding default regulations speed is larger.
Preferably, after condensate system produces the boost in pressure demand, on described oxygen-eliminating device, the override of water main inlet control valve pass aperture is under the power frequency operation pattern, the difference between the aperture of the aperture of the described upper water main inlet control valve that the unit load instruction is corresponding and the auxiliary modulating valve of revised upper water.
Preferably, the low side pressure in condensate system promotes and comprises: open soon high side valve, open low side valve and low side valve aperture instruction greater than 5%, and reset when low side valve aperture instruction boost in pressure signal less than 3% time.
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 control mode and pressure control mode, and described pressure control mode is used for controlling described condensate pump outlet main-piping pressure, and described liquid level control mode is used for controlling the water level of described oxygen-eliminating device;
when described frequency variator is in the liquid level control mode, by the 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 be the linearity control mode: when unit load is that load up is during the stage, on oxygen-eliminating device, the aperture of water main inlet control valve is according to the first default aperture curve adjustment, when unit load is that load down is during the stage, on oxygen-eliminating device, the aperture of water main inlet control valve is according to the second default aperture curve adjustment, wherein, the described first default aperture curve is preset the aperture curve in low load stage less than described second, wherein, described low load stage is between loading zone below 50%.
Preferably, when condensate system produces the boost in pressure demand, described frequency variator is automatically from the liquid level control mode switch to pressure control mode, the controller of described frequency variator is according to load instruction control curve values, oxygen-eliminating device pressure and the first predefined value sum, and curve values and boost in pressure curve values sum are controlled in described load instruction, determine the pressure set points of described frequency variator, wherein, the curve of curve for obtaining according to the corresponding relation between unit load and condensate pump outlet main-piping pressure controlled in described load instruction; Described boost in pressure curve is the curve that the corresponding relation between unit load and condensate pump outlet main-piping pressure correction value obtains;
After condensate system produces the boost in pressure demand, on described oxygen-eliminating device, the override of water main inlet control valve pass aperture is under the power frequency operation pattern, the difference of the aperture of the described upper water main inlet control valve that the unit load instruction is corresponding and the revised aperture of the auxiliary control valve opening of upper water.
Preferably, described controller specifically is used for:
Curve, oxygen-eliminating device pressure and the first predefined value sum are controlled in described load instruction, and described load instruction control curve values and boost in pressure curve values sum, get macrooperation, obtain when pressure maximum value corresponding to preload;
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;
Described the first force value is carried out obtaining the second force value after rate limit;
Described the first force value and described the second force value are got macrooperation, with the maximum value that obtains as pressure set points.
Preferably, the low side pressure in condensate system promotes and comprises: open soon high side valve, open low side valve and low side valve aperture instruction greater than 5%, and reset when low side valve aperture instruction boost in pressure signal less than 3% time.
The technological scheme that is provided by above the embodiment of the present application as seen, condensing generator set Condensate Pump Frequency Conversion controlling method, when frequency variator is in the liquid level control mode, water level by water regulating valve co-controlling oxygen-eliminating device on frequency variator and oxygen-eliminating device, regulate its rotating speed by frequency variator, and then the water level of control oxygen-eliminating device, the main inlet control valve on oxygen-eliminating device maintains certain aperture according to the unit load situation; Under same load, when load up, the closing pressure of upper water main inlet control valve is slightly little during than load down due to the cracking pressure of upper water main inlet control valve, therefore, when same load, when unit load is load up during the stage, on oxygen-eliminating device, the aperture of water main inlet control valve keeps less aperture, when unit load is load down during the stage, on oxygen-eliminating device, the water main inlet control valve keeps larger opening.By ascending, descending two curve controlled that fold of loading, produce certain load space, the upper water regulating valve aperture frequent variations that can avoid little fluctuation of load to cause simultaneously; The output frequency that can guarantee frequency variator after solidifying pump degree of depth Frequency Conversion Modification make the rotating speed of frequency variator lower, and then the electric current of frequency variator is less in adjustable and economic scope, has significantly reduced the energy consumption of frequency variator.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present application or technological scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, the accompanying drawing that the following describes is only some embodiments that put down in writing in the application, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
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 solidifying pump frequency conversion master electric loop wiring schematic diagram 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 aperture plotted curve of the upper water main inlet control valve of the corresponding oxygen-eliminating device of the 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 the 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 control mode and pressure control mode, described liquid level control mode is for controlling the water level of oxygen-eliminating device, and described pressure control mode is for controlling condensate pump outlet main-piping pressure; See also Fig. 1, said method comprising the steps of:
101, when described frequency variator is in the liquid level control mode, control 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 is controlled 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 be the linearity control mode, be specially described upper water main inlet control valve aperture random group load variation and change, when unit load is that load up is during the stage, on oxygen-eliminating device, the aperture of water main inlet control valve is according to the first default aperture curve adjustment, when unit load is that load down is during the stage, on oxygen-eliminating device, the aperture of water main inlet control valve is according to the second default aperture curve adjustment, wherein, (＜50% load) described first default aperture curve values is less than the described second default aperture curve values between low load region.
102, when described frequency variator is in pressure control mode, described frequency variator is automatically from the liquid level control mode switch to pressure control mode, curve, oxygen-eliminating device pressure and the first predefined value sum are controlled in instruction according to load, and curve and boost in pressure curve sum are controlled in described load instruction, determine the pressure set points of described frequency variator, so that the rotating speed of frequency variator reaches tachometer value corresponding to described pressure set points.
Wherein, the curve of curve for obtaining according to the corresponding relation between unit load and condensate pump outlet main-piping pressure controlled in described load instruction; Described boost in pressure curve is the curve that the corresponding relation between unit load and condensate pump outlet main-piping pressure correction value obtains.
The condensing generator set Condensate Pump Frequency Conversion controlling method that the present embodiment provides, when frequency variator was in the liquid level control mode, by the water level of water regulating valve co-controlling oxygen-eliminating device on frequency variator and oxygen-eliminating device, frequency variator was regulated the water level that its rotating speed is controlled oxygen-eliminating device; On oxygen-eliminating device, the water main inlet control valve maintains certain aperture according to the unit load situation; Under same load, on when on when load up, the cracking pressure of water main inlet control valve is than load down, the closing pressure of water main inlet control valve is slightly little, therefore, under same load, when unit is in load up during the stage, on oxygen-eliminating device, the aperture of water main inlet control valve keeps less aperture, and when unit is load down during the stage, on oxygen-eliminating device, the water main inlet control valve keeps larger opening.Simultaneously, two curve controlled that fold when loading by ascending, descending produce certain load space, the control valve opening frequent variations that can avoid little fluctuation of load to cause; After optimization control, the rotating speed of frequency variator is lower, and electric current is less, and the output frequency that guarantees frequency variator significantly reduces the energy consumption of frequency variator in adjustable and economic scope.
Be more than the application's core concept, understand better the application's scheme in order to make those skilled in the art person, below in conjunction with accompanying drawing, the application is 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, see also 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 feed isolating switch K1 and the rear 6kVA1 section bus that connects of circuit breaker Q S1 series connection, and simultaneously, 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.
See also Fig. 3, the water outlet of vapour condenser 201 connects condensate pump A and B simultaneously, and condensate pump A is connected gland heater 202 with B, and the water outlet of gland heater 202 connects oxygen-eliminating device 205 by the auxiliary modulating valve 204 of upper water main inlet control valve 203 and upper water.Simultaneously, the water outlet of gland heater 202 also connects the water intake of vapour condenser 201 by condensate pump recirculation (egr) valve 206.
During at normal operating condition, condensate pump is in the liquid level control mode when condensing generator set condensate system, 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 less aperture to carry out auxiliary adjustment.
On oxygen-eliminating device, the water main inlet control valve has two kinds of control modes, respectively linear mode control and liquid level control mode, wherein, when condensate system is in normal operating condition, on oxygen-eliminating device, the water main inlet control valve is in linear mode control, refer to that the water main inlet control valve remains on certain aperture, and its aperture changes with the variation of loading.When frequency variator switched to the frequency conversion operating mode from the power frequency operating mode, on oxygen-eliminating device, the water main inlet control valve was in the liquid level control mode, and namely on oxygen-eliminating device, the aperture of water main inlet control valve slowly is adjusted to the value of frequency variator under the liquid level control mode.
Concrete, when condensate system was in normal operating phase, on oxygen-eliminating device, the water main inlet control valve was in linear mode control, was 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, in the load up stage, according to the aperture of water main inlet control valve on the first default aperture curve adjustment; In the load down stage, according to the aperture of water main inlet control valve on the second default aperture curve adjustment.
Can match 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 units need to be adjusted according to actual conditions, please see table 1 and Fig. 4 for details, Figure 4 shows that the aperture plotted curve 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 regulation curve of the upper water main inlet control valve that the load up process is corresponding, and represents the regulation curve of the upper water main inlet control valve that the load down process is corresponding.
Table 1
Under the prerequisite that guarantees 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 less aperture in the load up process, in the load down process, keep larger opening.Such as, when loading as 100MW, if be in the load up process, the aperture that goes up the water main inlet control valve is 17%, if be in the load down process, the aperture that goes up the 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 the liquid level control mode from pressure control mode, the rotating speed of frequency variator returns to tachometer value corresponding under preload gradually, and on oxygen-eliminating device, the water main inlet control valve also is adjusted to the opening value of frequency variator correspondence under the liquid level control mode gradually.For making the condensate system operation more stable, adopt the aperture that on oxygen-eliminating device, rate variation corresponding to water main inlet control valve aperture instruction regulated described upper water main inlet control valve, the aperture of this rate value and upper water main inlet control valve is inversely proportional to, thereby guaranteed that upper water main inlet control valve reduces throttling as far as possible when low aperture, thereby reduced the energy consumption that throttling causes, and then strengthened Systems balanth.
Rate variation corresponding to described water main inlet control valve aperture instruction is specifically as shown in table 2:
Table 2
As seen from the above table, the regulation rate 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 that namely goes up the water main inlet control valve is larger, and regulations speed is less.
See also Fig. 5, show the block diagram of realizing of pressure set points that the embodiment of the present application provides.Below 20%, perhaps when frequency variator was in pressure control mode, deaerator level was controlled by water regulating valve on oxygen-eliminating device when unit load, Frequency Converter Control condensate pump outlet main-piping pressure.
Concrete, operator's incoming pressure setting value manual according to the load condition of unit, described pressure set points obtains according to compute mode shown in Figure 5.
Instruction curve f (LD) 201, boost in pressure curve f (LD2) and load instruction curve sum (being f (LD)+f (LD2)) 202, oxygen-eliminating device pressure P and the first predefined value sum (being P+0.3MPa) 203 of loading got macrooperation 204, select the maximum value in a certain load instruction corresponding pressure value from the three, obtain the first force value.
Wherein, when described boost in pressure curve f (LD2) produces the boost in pressure demand for condensate system, the lifting curve of the frequency variator rotating speed that different load instructions is corresponding obtains the data shown in table 3 by test, and 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 |
The first force value is added upper offset 205 obtain the second force value, the second force value is carried out rate limit computing 206 and got macrooperation 207 with described the second force value, obtain higher value as final pressure set points.
Like this, when condensate system produces the boost in pressure demand, adopt structured flowchart shown in Figure 4, calculate pressure set points corresponding under a certain load, water of condensation delivery side of pump main-piping pressure is promoted rapidly, improve the speed of response of system; And pressure drop can slowly approach when regulating, thereby has realized pressure controlled fast and stable, prevents that the phenomenon of toning when pressure is regulated from occuring downwards, makes the condensate system operation more stable.
When frequency variator during not in the liquid level control mode, the water level of oxygen-eliminating device is controlled by water main inlet control valve on oxygen-eliminating device and the auxiliary modulating valve of upper water, the below is take the 600MW supercritical unit as example, and when loading less than 120MW, the auxiliary control valve opening of described upper water keeps complete shut-down, when loading less than 295MW, keep less aperture, when loading greater than 330MW, aperture increases, the participation deaerator level is regulated, and deaerator level is mainly regulated by upper water main inlet control valve.
After condensate system produces the 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 the 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 the boost in pressure demand, the frequency variator rotating speed is promoted to rapidly the tachometer value when preload correspondence under the power frequency operation mode, and on oxygen-eliminating device, the water main inlet control valve closes rapidly to the power frequency operation operating mode and go up the auxiliary control valve opening value of water after corresponding the passing through of preload revised.
Concrete, on the corresponding oxygen-eliminating device of instruction of loading under the power frequency operation pattern, 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 the 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, and the PID output order when namely controlling according to deaerator level three momentums is revised the auxiliary modulating valve of upper water.Concrete correction data are as shown in table 5.
Table 5
The below is closed the procurement process of aperture with water main inlet control valve override on a concrete example explanation oxygen-eliminating device, suppose that load is 600MW, during converting operation, on oxygen-eliminating device, the aperture of water main inlet control valve is 85%, the aperture of the upper water main inlet control valve that during power frequency operation, the 600MW load is corresponding is 30%, the auxiliary modulating valve of upper water is standard-sized sheet under the 600MW load, the aperture correction value of the auxiliary modulating valve of upper water is 12%, it is 30%-12%=18% that the override of therefore upper water main inlet control valve closes aperture, and the aperture that namely goes up the water main inlet control valve is closed to 18% from 85% override.
after condensate system produces the 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 the power frequency operation pattern, difference with the revised aperture of the auxiliary control valve opening of upper water, make the aperture of water main inlet control valve and the rotating speed of frequency variator be complementary, the speed that upper water main inlet control valve is closed is coordinated mutually with the speed that frequency variator promotes, avoided the significantly variation of deaerator level, thereby reduced the disturbance of deaerator level to condensate pump outlet main-piping pressure, make the condensate system operation more stable.
In addition, when following any situation occurs, the frequency variator override is to when corresponding rotating speed during power frequency operation under preload, and control condensate pump outlet main-piping pressure, on oxygen-eliminating device, the aperture override of water main inlet control valve closes to the difference of the revised value of aperture of upper water main inlet control valve aperture corresponding when the power frequency operation operating mode under preload and the auxiliary modulating valve of upper water, and the control of deaerator level transfers valve control to be conducive to more accurately upper water main inlet control valve be positioned control by water on oxygen-eliminating device.
1) any outlet temperature of low voltage bypass A/B is higher than 120 ℃;
2) any little unit sealing water return water temperature any point is higher than 75 ℃ (when resetting lower than 70 ℃);
When sealing the water return water temperature lower than 70 ℃, no longer trigger the condensate system trouble signal and reset, namely described frequency variator need not override to the power frequency operation mode, still is in the liquid level control mode, namely controls the water level of oxygen-eliminating device.3) low voltage bypass is in the boost in pressure pattern;
4) frequency variator is in operation, arbitrary condensate pump water main inlet control valve on power frequency operation mode and oxygen-eliminating device operates in automated manner, described automated manner refers to that the water main inlet control valve utilizes PID(Proportion Integration Differentiation according to the deviation between the water level actual value of deaerator level setting value and oxygen-eliminating device, proportional-integral-differential) control mode automatic control water level makes it reach the 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 soon high side valve, open low side valve, low other aperture instruction is greater than 5% 3 kind of situation, and when low other aperture instruction less than 3% the time, low side valve boost in pressure signal resets, namely do not carry out boost in pressure, greatly reduce the consumption of steam, improved the performance of unit.
In the condensing generator set Condensate Pump Frequency Conversion control system that the application provides, owing to provided for pump seal water by water of condensation, therefore be subjected to condensate pump outlet main-piping pressure variable effect larger for the temperature of pump seal water, especially in the situation that switchable pump and condensate system produce the boost in pressure demand, the pid parameter corrective action is not obvious, therefore, increase condensate pump outlet main-piping pressure feed-forward loop to controlling for the pump seal coolant-temperature gage, namely when condensate pump outlet main-piping pressure is higher, reduces the sealing coolant-temperature gage and transfer the valve instruction; When condensate pump outlet main-piping pressure is low, increase the sealing coolant-temperature gage and transfer the valve instruction, to reduce to seal the amplitude that coolant-temperature gage changes as far as possible, realize the fast and stable of sealing coolant-temperature gage is controlled, improve simultaneously the stability of condensate system.
For after the sealing coolant-temperature gage control to increase condensate pump outlet main-piping pressure feed-forward loop, the range of temperature of sealing water is lower, regulates rapidlyer, and condensate system is more stable.
In sum, the unit take capacity as 600MW is example, starts to the 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 the auxiliary modulating valve AV of water from unit as shown in table 6:
Table 6
In upper table
Arranging in presentation logic when loading lower than 295MW has loop, quick pass, makes the less aperture of the auxiliary modulating valve maintenance of water on oxygen-eliminating device;
Expression makes the auxiliary modulating valve increase of water aperture on oxygen-eliminating device when load has the fast open loop during higher than 330MW, makes it better to regulate water level.
Need to prove, in this article, relational terms such as the first and second grades only is used for an entity or operation are separated with another entity or control panel, and not necessarily requires or hint and have the relation of any this reality or sequentially between these entities or operation.
The above is only the application's embodiment; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the application's principle; can also make some improvements and modifications, these improvements and modifications also should be considered as the application's protection domain.
Claims (10)
1. condensing generator set Condensate Pump Frequency Conversion controlling method, be applied to the 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 control mode and pressure control mode, described liquid level control mode is for controlling deaerator level, and described pressure control mode is for controlling condensate pump outlet main-piping pressure, and described method comprises:
when described frequency variator is in the liquid level control mode, control the water level of oxygen-eliminating device by the 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 be the linearity control mode: when unit load is that load up is during the stage, aperture according to water main inlet control valve on the first default aperture curve adjustment oxygen-eliminating device, when unit load is that load down is during the stage, aperture according to water main inlet control valve on the second default aperture curve adjustment oxygen-eliminating device, wherein, the described first default aperture curve opening value is preset aperture curve opening value in low load stage less than described second, wherein, described low load stage is between loading zone below 50%.
2. method according to claim 1, is characterized in that, also comprises:
When frequency variator is in pressure control mode, described frequency variator is automatically from the liquid level control mode switch to pressure control mode, curve, oxygen-eliminating device pressure and the first predefined value sum are controlled in instruction according to load, and curve and boost in pressure curve sum are controlled in described load instruction, determine the pressure set points of described frequency variator, so that the rotating speed of frequency variator reaches tachometer value corresponding to described pressure set points, wherein, the curve of curve for obtaining according to the corresponding relation between unit load and condensate pump outlet main-piping pressure controlled in described load instruction; Described boost in pressure curve is the curve that the corresponding relation between unit load and condensate pump outlet main-piping pressure correction value obtains.
3. method according to claim 2, is characterized in that, definite process of described pressure set points specifically comprises:
Curve, oxygen-eliminating device pressure and the first predefined value sum are controlled in described load instruction, and described load instruction control curve and boost in pressure curve sum, get macrooperation, obtain when pressure maximum value corresponding to preload;
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;
Described the first force value is carried out obtaining the second force value after rate limit;
Described the first force value and described the second force value are got computing, with the maximum value that obtains as pressure set points.
4. method according to claim 1, it is characterized in that, also comprise: when frequency variator switches to the liquid level control mode from pressure control mode, on oxygen-eliminating device, the water main inlet control valve is regulated aperture according to rate of change corresponding to aperture instruction, rate of change corresponding to described aperture instruction is different default regulations speeds corresponding to the different opening of described upper water main inlet control valve, and aperture is less, and corresponding default regulations speed is larger.
5. method according to claim 1, it is characterized in that, also comprise: after condensate system produces the boost in pressure demand, on described oxygen-eliminating device, the override of water main inlet control valve pass aperture is under the power frequency operation pattern, the difference between the aperture of the aperture of the described upper water main inlet control valve that the unit load instruction is corresponding and the auxiliary modulating valve of revised upper water.
6. method according to claim 1 is characterized in that: the low side pressure in condensate system promotes and comprises: open soon high side valve, open low side valve and low side valve aperture instruction greater than 5%, and reset when low side valve aperture instruction boost in pressure signal less than 3% time.
7. a condensing generator set Condensate Pump Frequency Conversion control system, is characterized in that, 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 control mode and pressure control mode, and described pressure control mode is used for controlling described condensate pump outlet main-piping pressure, and described liquid level control mode is used for controlling the water level of described oxygen-eliminating device;
when described frequency variator is in the liquid level control mode, by the 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 be the linearity control mode: when unit load is that load up is during the stage, on oxygen-eliminating device, the aperture of water main inlet control valve is according to the first default aperture curve adjustment, when unit load is that load down is during the stage, on oxygen-eliminating device, the aperture of water main inlet control valve is according to the second default aperture curve adjustment, wherein, the described first default aperture curve is preset the aperture curve in low load stage less than described second, wherein, described low load stage is between loading zone below 50%.
8. system according to claim 7 is characterized in that:
When condensate system produces the boost in pressure demand, described frequency variator is automatically from the liquid level control mode switch to pressure control mode, the controller of described frequency variator is according to load instruction control curve values, oxygen-eliminating device pressure and the first predefined value sum, and curve values and boost in pressure curve values sum are controlled in described load instruction, determine the pressure set points of described frequency variator, wherein, the curve of curve for obtaining according to the corresponding relation between unit load and condensate pump outlet main-piping pressure controlled in described load instruction; Described boost in pressure curve is the curve that the corresponding relation between unit load and condensate pump outlet main-piping pressure correction value obtains;
After condensate system produces the boost in pressure demand, on described oxygen-eliminating device, the override of water main inlet control valve pass aperture is under the power frequency operation pattern, the difference of the aperture of the described upper water main inlet control valve that the unit load instruction is corresponding and the revised aperture of the auxiliary control valve opening of upper water.
9. system according to claim 8, is characterized in that, described controller specifically is used for:
Curve, oxygen-eliminating device pressure and the first predefined value sum are controlled in described load instruction, and described load instruction control curve values and boost in pressure curve values sum, get macrooperation, obtain when pressure maximum value corresponding to preload;
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;
Described the first force value is carried out obtaining the second force value after rate limit;
Described the first force value and described the second force value are got macrooperation, with the maximum value that obtains as pressure set points.
10. system according to claim 7 is characterized in that: the low side pressure in condensate system promotes and comprises: open soon high side valve, open low side valve and low side valve aperture instruction greater than 5%, and reset when low side valve aperture instruction boost in pressure signal less than 3% time.
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| CN103452608A (en) * | 2013-09-04 | 2013-12-18 | 中国神华能源股份有限公司 | Control device and control method for condensate system |
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| CN105840473A (en) * | 2016-04-18 | 2016-08-10 | 中国神华能源股份有限公司 | Energy-saving and safe operation method of condensing pumps under low load of generator set |
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