CN103062755A - Condensation water circulating system of power station - Google Patents
Condensation water circulating system of power station Download PDFInfo
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- CN103062755A CN103062755A CN2013100250093A CN201310025009A CN103062755A CN 103062755 A CN103062755 A CN 103062755A CN 2013100250093 A CN2013100250093 A CN 2013100250093A CN 201310025009 A CN201310025009 A CN 201310025009A CN 103062755 A CN103062755 A CN 103062755A
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Abstract
The invention discloses a condensation water circulating system of a power station. The condensation water circulating system comprises a condensation water pump unit (4), a deaerator water tank (1), a low-pressure heater unit (2), a recycling branch (3), a condensation water supplement water tank (6), and a condensation water recovering branch (7). A control module which responds to a water level signal of the deaerator water tank to adjust rotating speed of three condensation water pumps (43) is arranged on a frequency converter. A deaerator water level adjusting gate and a deaerator water level separating gate are arranged on a low-pressure heater bypass pipe. The invention further discloses another condensation water circulating system of the power station. The another condensation water circulating system comprises a condensation water pump unit, a deaerator water tank, a low-pressure heater unit, a condensation water supplement water tank and a condensation water recovering branch, wherein the a control module which responds to a water level signal of the deaerator water tank to adjust rotating speed of three condensation water pumps is arranged on a frequency converter, and a deaerator water level adjusting gate and a deaerator water level separating gate are arranged on a low-pressure heater bypass pipe. The condensation water circulating systems are used for simplifying pipelines of condensation water.
Description
Technical field
The present invention relates to the thermal power generation field, particularly, relate to a kind of condensate water circulatory system of power plant.
Background technology
The condensate pump of large-scale thermal power machine group of the prior art is improved to the use transducer drive mostly.Transducer drive has preferably starting characteristic and speed adjusting performance, can effectively control the method for operation of condensate pump, thereby accurately controls the height of water level of condensate water and the size of flow.
Accompanying drawing 1 to accompanying drawing 3 is the main electrical system wiring diagrams of frequency converter and condensate pump three kinds.Wherein, shown in the accompanying drawing 1 is the frequency conversion drive mode of the condensate pump one drag two of 2 * 100% flows, and the maximum stream flow of every condensate pump is that 100%, two condensate pump of maximum stream flow of the condensate water circulatory system is for subsequent use each other.Shown in the accompanying drawing 2 is that the condensate pump two of 3 * 50% capacity drags three frequency conversion drive mode, the maximum stream flow of every condensate pump be the condensate water circulatory system maximum stream flow 50%, start two condensate pumps when normally moving, another is for subsequent use.Shown in the accompanying drawing 3 is the frequency conversion drive mode of the condensate pump one-to-one of 3 * 35% capacity, the maximum stream flow of every condensate pump be the condensate water circulatory system maximum stream flow 35%, frequency converter drives the operation of three condensate pumps one to one.The frequency conversion drive mode of the condensate pump one-to-one of 3 * 35% capacity can realize the full operating mode speed Control that starts to steady-state operation from unit basically.
Yet, although the type of drive to condensate pump is improved in the prior art, further the pipeline setting of condensate water is not optimized.It is the schematic diagram that the pipeline of the condensate water circulatory system of prior art arranges in the accompanying drawing 4.Three condensate pumps 43 pump into condensate water in the jellyfish pipe 8 that condenses in the first condensate tank 511 and the second condensate tank 531, and minute three tunnel operations.2 heating and enter follow-up oxygen-eliminating device through the low-pressure heater unit of first via condensate water.The the second tunnel condensate water is got back to the first condensate tank 511 and the second condensate tank 513 through recirculation strand 3.The reason that recirculation strand 3 is set is, the flow that flows through the condensate water of every condensate pump 43 can not be less than the minimum discharge of condensate pump 43, otherwise condensate pump 43 just might damage.; when condensing water flow required in the condensate pipe during less than the minimum discharge of condensate pump 43; even condensate pump 43 operates in minimum operational mode, its condensate water that pumps in the jellyfish pipe 43 that condenses also can excess, and can't reduce the flow of condensate pump 43 this moment again.Under this operating mode, can open recirculation strand 3, so that the condensate water of excess flow back into the first condensate tank 511 and the second condensate tank 531, thereby guarantee that condensate pump 43 is until the normal operation of whole condensate system.The Third Road condensate water reclaims branch road 7 through condensate water and flows to condensate water subsidiary water tank 6.When the pump discharge of condensing is too high less than the minimum permissible flow of condensate pump or the first condensate tank 511 and the second condensate tank 531 water levels, opens condensate water and reclaim branch road 7 and make condensate water be diverted to condensate water subsidiary water tank 6 to store.And, also having deaerator level adjustment unit 900 in this condensate system, the water inlet of this deaerator level adjustment unit 900 connects the jellyfish pipe 8 that condenses, and delivery port connects the water inlet of low-pressure heater unit 2.Deaerator level adjustment unit 900 comprises that 2 are adjusted door and 5 isolating doors, are used for regulating the water level of deaerator storage tank.This condensate water circulatory system pipeline set-up mode of the prior art is applicable to have in the system of the poor condensate pump of condensate pump that constant speed drives or speed adjusting performance.When condensate pump is improved to the frequency conversion drive mode, re-use the pipeline setting of such complexity, can cause the waste of manufacturing cost and operating cost.That is to say, the condensate water circulatory system of the prior art has to be optimized.
Summary of the invention
The condensate water circulatory system that the purpose of this invention is to provide a kind of power plant in order to simplifying the pipeline setting of condensate water, thereby reduces manufacturing cost and the operating cost of the condensate water circulatory system.
To achieve these goals, the invention provides a kind of condensate water circulatory system of power plant, this condensate water circulatory system comprises: the condensate pump unit, this condensate pump unit comprises three frequency converters, and respectively by three condensate pumps of three transducer drives, the outlet pipe of these three condensate pumps forms the jellyfish pipe that condenses; Deaerator storage tank; The low-pressure heater unit, the water inlet of this low-pressure heater unit is connected to the jellyfish pipe that condenses, and delivery port is connected to deaerator storage tank; This low-pressure heater unit comprises in sequential series along the flow direction of condensate water and is arranged in parallel a plurality of low-pressure heaters of low-pressure heater shunt valve; Recirculation strand, this recirculation strand are arranged between the water inlet of the jellyfish Guan Zhisan platform condensate pump that condenses; The condensate water subsidiary water tank; And condensate water recovery branch road, this condensate water recovery branch road is arranged on and condenses between jellyfish pipe and the condensate water subsidiary water tank; Wherein, be provided with the control module of the rotating speed of three condensate pumps of water level signal adjusting that respond deaerator storage tank on the frequency converter; And be provided with the deoxygenation water level at the low-pressure heater shunt valve and adjust door and isolating door.
Preferably, the maximum stream flow of every condensate pump be the condensate water circulatory system maximum stream flow 35%.
Preferably, each low-pressure heater of a plurality of low-pressure heaters is respectively arranged with low-pressure heater shunt valve separately, is connected by condensate pipe between each low-pressure heater shunt valve; Wherein, the low-pressure heater shunt valve of the low-pressure heater shunt valve of first low-pressure heater and second low-pressure heater is connected in series and forms the first low-pressure heater shunt valve; And deoxygenation water level adjustment door and deoxygenation water level isolating door are connected in series in this first low-pressure heater shunt valve; Wherein, deoxygenation water level isolating door has two, is connected to the both sides that the deoxygenation water level is adjusted door.
Preferably, the condensate water circulatory system comprises the first condenser and the second condenser of collecting exhaust steam and exhaust steam being cooled to condensate water, and the first condensate tank and the second condensate tank that lay respectively at the bottom of the first condenser and the second condenser; Wherein, the first condensate tank be connected the delivery port of condensate tank and connect the water inlet of three condensate pumps; And first low-pressure heater and second low-pressure heater are separately positioned in the first condenser and the second condenser.
Preferably, recirculation strand comprises: the recirculation main line, the water inlet of this recirculation main line connects the jellyfish pipe that condenses, the delivery port of this recirculation main line connects the water inlet of the first condensate tank and/or the second condensate tank, along the flow direction of condensate water, the first recirculation isolating door, recirculation adjustment door and the second recirculation isolating door of being connected with in sequential series on the recirculation main line; And the recirculation bypass, this recirculation bypass is arranged in parallel with the recirculation main line.
Preferably, be connected with the moisturizing water pump that condensate water is pumped into the first condensate tank and/or the second condensate tank from the condensate water subsidiary water tank between the water inlet of condensate water subsidiary water tank and the first condensate tank and/or the second condensate tank.
On the other hand, the present invention also provides a kind of condensate water circulatory system of power plant, this condensate water circulatory system comprises: the condensate pump unit, this condensate pump unit comprises three frequency converters, and respectively by three condensate pumps of three transducer drives, the maximum stream flow of every condensate pump be the condensate water circulatory system maximum stream flow 35%; And the outlet pipe of these three condensate pumps forms the jellyfish pipe that condenses; Deaerator storage tank; The low-pressure heater unit, the water inlet of this low-pressure heater unit is connected to the jellyfish pipe that condenses, and delivery port is connected to deaerator storage tank; This low-pressure heater unit comprises in sequential series along the flow direction of condensate water and is arranged in parallel a plurality of low-pressure heaters of low-pressure heater shunt valve; The condensate water subsidiary water tank; And condensate water recovery branch road, this condensate water recovery branch road is arranged on and condenses between jellyfish pipe and the condensate water subsidiary water tank; Wherein, be provided with the control module of the rotating speed of three condensate pumps of water level signal adjusting that respond deaerator storage tank on the frequency converter; And be provided with the deoxygenation water level at the low-pressure heater shunt valve and adjust door and isolating door.
Preferably, each low-pressure heater of a plurality of low-pressure heaters is respectively arranged with low-pressure heater shunt valve separately, is connected by condensate pipe between each low-pressure heater shunt valve; The low-pressure heater shunt valve of first low-pressure heater and the low-pressure heater shunt valve of second low-pressure heater are connected in series and form the first low-pressure heater shunt valve; And deoxygenation water level adjustment door and deoxygenation water level isolating door are connected in series in this first low-pressure heater shunt valve; Wherein, deoxygenation water level isolating door has two, is connected to the both sides that the deoxygenation water level is adjusted door.
Preferably, the condensate water circulatory system comprises the first condenser and the second condenser of collecting exhaust steam and exhaust steam being cooled to condensate water, and the first condensate tank and the second condensate tank that lay respectively at the bottom of the first condenser and the second condenser; Wherein, the first condensate tank be connected the delivery port of condensate tank and connect the water inlet of three condensate pumps; And first low-pressure heater and second low-pressure heater are separately positioned in the first condenser and the second condenser.
Preferably, be connected with the moisturizing water pump that condensate water is pumped into the first condensate tank and/or the second condensate tank from the condensate water subsidiary water tank between the water inlet of condensate water subsidiary water tank and the first condensate tank and/or the second condensate tank.
By technique scheme, the condensate water circulatory system that provides according to an aspect of the present invention replaces deaerator level adjustment unit of the prior art with deoxygenation water level adjustment door and deoxygenation water level isolating door.That is to say, the condensate water circulatory system of the present invention is utilized 1 combination of adjusting door and 2 isolating doors, has replaced 2 combinations of adjusting door and 5 isolating doors of the prior art.Because adjustment door and isolating door in the system can produce the throttling loss that is directly proportional with the flow of condensate water, therefore, adopt the condensate water circulatory system of the present invention not only can reduce number of devices, can also reduce operating throttling loss.Especially in the heavy-duty service operating mode, condensate water circulatory system flow is all larger, just more can highlight energy-saving and cost-reducing beneficial effect of the present invention.In addition, the condensate water circulatory system that provides according to another aspect of the present invention is further to have cancelled recirculation strand of the prior art on the basis of above-described embodiment, only reclaims branch road shunting condensate water by condensate water.Like this, just can further eliminate the unit energy consumption that recirculation strand produces in starting or stoping process, therefore produce better energy-saving effect.
Other features and advantages of the present invention will partly be described in detail in the specific embodiment subsequently.
Description of drawings
Accompanying drawing is to be used to provide a further understanding of the present invention, and consists of the part of specification, is used from explanation the present invention with the following specific embodiment one, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the electrical system wiring diagram of the frequency conversion drive mode of one drag two of the prior art;
Fig. 2 of the prior art two drags the electrical system wiring diagram of three frequency conversion drive mode;
Fig. 3 is the electrical system wiring diagram of the frequency conversion drive mode of one-to-one of the prior art;
Fig. 4 is the schematic diagram that the pipeline of simplification of the condensate water circulatory system of prior art arranges;
Fig. 5 is the electrical system wiring diagram according to frequency conversion drive mode of the present invention;
Fig. 6 is the pipeline schematic diagram according to the simplification of the condensate water circulatory system of one embodiment of the present invention;
Fig. 7 is the pipeline schematic diagram according to the simplification of the condensate water circulatory system of another embodiment of the invention.
Description of reference numerals
The specific embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated.Should be understood that, the specific embodiment described herein only is used for description and interpretation the present invention, is not limited to the present invention.
With reference to figure 5 and Fig. 6, the invention provides a kind of condensate water circulatory system of power plant.This condensate water circulatory system comprises condensate pump unit 4, and the condensate pump 43 in this condensate pump unit 4 drives condensate water and flow to low-pressure heater unit 2.Condensate water heats in low-pressure heater unit 2 and enters follow-up oxygen-eliminating device.The delivery port of low-pressure heater unit 2 connects deaerator storage tank 1, and this deaerator storage tank 1 supplies water to oxygen-eliminating device, to remove the oxidizing gas in the condensate water, guarantees the quality of boiler feedwater.
More specifically, according to embodiments of the invention, the condensate water circulatory system comprises condenser.This condenser is used for collecting the exhaust steam of having finished merit, and exhaust steam is cooled to condensate water.Be provided with condensate tank in the bottom of condenser in order to collect condensate water, the delivery port of condensate tank connects the water inlet of condensate pump 43.According to embodiments of the invention, condenser comprises the first condenser 51 and the second condenser 53, and condensate tank comprises the first condensate tank 511 and the second condensate tank 531.Wherein, the first condensate tank 511 is positioned at the bottom of the first condenser 51, and the second condensate tank 531 is positioned at the bottom of the second condenser 53, and is communicated with by tube connector between the first condensate tank 511 and the second condensate tank 531.The delivery port of the first condensate tank 511 and the second condensate tank 531 is joined together to form the delivery port of condensate tank.
According to embodiments of the invention, with reference to figure 5, condensate pump unit 4 comprises three frequency converters 41, and three condensate pumps 43 that driven one to one by three frequency converters 41 respectively.That is to say, the power supply mode of condensate pump 43 of the present invention adopts the frequency conversion drive mode of one-to-one.On three frequency converters 41, be provided with the control module of the rotating speed of regulating three condensate pumps 43.According to a preferred embodiment of the invention, the maximum stream flow of every condensate pump 43 be the condensate water circulatory system maximum stream flow 35%.That is to say, the total flow of three condensate pumps 43 is 3 * 35%.Like this, the total flow of three condensate pumps 43 can satisfy the maximum stream flow requirement of condensate system, and the Flow-rate adjustment mode of three condensate pumps 43 is accurate flexibly, substantially can realize full operating mode speed change adjusting.The water inlet of three condensate pumps 43 connects the delivery port of condensate tank, and the outlet pipe of three condensate pumps 43 forms the jellyfish pipe 8 that condenses.
In addition, according to embodiments of the invention, the water inlet of low-pressure heater unit 2 connects the jellyfish pipe 8 that condenses, and delivery port connects deaerator storage tank 1.Low-pressure heater unit 2 comprises along the flow direction of condensate water a plurality of low-pressure heaters in sequential series, and these a plurality of low-pressure heaters include but not limited to first low-pressure heater 211, second low-pressure heater 213, the 3rd low-pressure heater 215 and the 4th low-pressure heater 217.Wherein, these a plurality of low-pressure heaters have been arranged in parallel the low-pressure heater shunt valve.According to embodiments of the invention, first low-pressure heater 211, second low-pressure heater 213, the 3rd low-pressure heater 215 and the 4th low-pressure heater 217 can be respectively arranged with low-pressure heater shunt valve separately, are connected by condensate pipe between each low-pressure heater shunt valve.Should be appreciated that the low-pressure heater shunt valve connection in sequential series of first low-pressure heater 211, second low-pressure heater 213, the 3rd low-pressure heater 215 and the 4th low-pressure heater 217.Wherein, the low-pressure heater shunt valve of the low-pressure heater shunt valve of first low-pressure heater 211 and second low-pressure heater 213 is connected in series rear formation the first low-pressure heater shunt valve 23.In addition, according to embodiments of the invention, first low-pressure heater 211 and second low-pressure heater 213 are separately positioned in the first condenser 51 and the second condenser 53.So, condensate water in first low-pressure heater 211 and second low-pressure heater 213 can be heated by the heat that absorbs the exhaust steam in the first condenser 51 and the second condenser 53, thereby has reduced the cost of investment of first low-pressure heater 211 and second low-pressure heater 213.
Continuation according to embodiments of the invention, also is connected with recirculation strand 3, in order to regulate the flow of condensate water with reference to figure 5 and Fig. 6 on the jellyfish pipe 8 that condenses.Recirculation strand 3 is arranged between the water inlet of condense jellyfish pipe 8 and three condensate pumps 43, when the condensing water flow in the jellyfish pipe 8 that condenses is excessive, make a part of condensate water turn back to the water inlet of three condensate pumps 43 from the jellyfish pipe 8 that condenses by recirculation strand 3.According to embodiments of the invention, recirculation strand 3 comprises recirculation main line 31, and with the recirculation bypass 33 that is arranged in parallel of recirculation main line 31.Wherein, recirculation bypass 33 is used when flushing and maintenance recirculation main line 31.More specifically, according to embodiments of the invention, the water inlet of recirculation main line 31 connects the jellyfish pipe 8 that condenses, and the delivery port of recirculation main line 31 connects the water inlet of the first condensate tank 511 and/or the second condensate tank 531.And, along the flow direction of condensate water, the first recirculation isolating door 311, recirculation adjustment the door 315 and second recirculation isolating door 313 of being connected with in sequential series on the recirculation main line 31.Under system's accidental conditions, remain little negative pressure in the first condenser 51 and the second condenser 53.That is, the first condensate tank 511 and/or the second condensate tank 531 inside are little negative pressure.Therefore, when opening the first recirculation isolating door 311, recirculation adjustment door the 315 and second recirculation isolating door 313, condensate water can flow to the first condensate tank 511 and/or the second condensate tank 531 from the jellyfish pipe 8 that condenses.
Further, according to embodiments of the invention, on the jellyfish pipe 8 that condenses, also be connected with condensate water and reclaim branch road 7, in order to regulate the flow of condensate water.The water inlet that condensate water reclaims branch road 7 connects the jellyfish pipe 8 that condenses, and delivery port connects condensate water subsidiary water tank 6.When operating condensing water flow is excessive, a part of condensate water can be reclaimed branch road 7 through condensate water and send in the condensate water subsidiary water tank 6 and store.According to embodiments of the invention, between the water inlet of condensate water subsidiary water tank 6 and the first condensate tank 511 and/or the second condensate tank 531, be connected with the moisturizing water pump.This moisturizing water pump comprises the startup control module, and is provided with level sensor in the first condensate tank 511 and/or the second condensate tank 531.This input that starts control module is electrically connected with this level sensor, and this output that starts control module is electrically connected with the start-up circuit of moisturizing water pump.When the water level in the first condensate tank 511 and/or the second condensate tank 531 is lower than ordinary water level, start control module and start the moisturizing water pump, the condensate water in the condensate water subsidiary water tank 6 is pumped in the first condensate tank 511 and/or the second condensate tank 531.
Still with reference to figure 5 and Fig. 6, according to embodiments of the invention, three frequency converters 41 have the control module of the rotating speed of regulating three condensate pumps 43, and this control module can respond water level signal output condensate pump 43 rotary speed regulating signals of deaerator storage tank 1.In more detail, be provided with level sensor in the deaerator storage tank 1, this level sensor is electrically connected with the input of the control module of frequency converter 41.The output of control module is electrically connected with the input interface of the alignment circuit of condensate pump 43.When the water level in the deaerator storage tank 1 exceeded or be lower than the required water level of normal operation, control module was sent the rotating speed that speed-regulating signal is adjusted three condensate pumps 43, changed the flow of condensate water, thereby made the water level in the deaerator storage tank 1 get back to ordinary water level.According to above-mentioned, the present invention adopts 3 * 35% one-to-one frequency conversion drive mode to drive three condensate pumps 43, the Flow-rate adjustment of the condensate water circulatory system is accurate flexibly, so the water level of deaerator storage tank 1 is regulated substantially and can be realized by the rotational speed regulation of three frequency converters 41.
Further, according to embodiments of the invention, at the low-pressure heater shunt valve deoxygenation water level is set and adjusts door 231 and deoxygenation water level isolating door 233, be used for the water level at unit starting or stopped process adjusting deaerator storage tank 1.In other words, unit start and stopped process in, condensing water flow fluctuates larger, and the control of the water level of deaerator storage tank 1 is had relatively high expectations.In order to make the water level in the deaerator storage tank 1 in unit starting and stopped process, still remain on normal operation level, deoxygenation water level adjustment door 231 and deoxygenation water level isolating door 233 can be put into operation, match with the speed-regulating function with three frequency converters 41, jointly finish the control to the water level of deaerator storage tank 1.
More specifically, along the flow direction of condensate water, it is in sequential series in the first low-pressure heater shunt valve 23 that deoxygenation water level isolating door 233 and deoxygenation water level are adjusted door 231.When unit is in startup and the mode out of service, if the water level of deaerator storage tank 1 is lower than normal operating water level, just open deoxygenation water level isolating door 233 and deoxygenation water level and adjust door 231, condensate water will flow through from the first low-pressure heater shunt valve 23, thereby makes the rising of groundwater level of deaerator storage tank 1.If the water level of deaerator storage tank 1 is higher than normal operating water level, can open recirculation strand 3, open again in case of necessity condensate water and reclaim branch road 7, the condensate water in the jellyfish pipe 8 that condenses is diverted in condensate tank and the condensate water subsidiary water tank 6, thereby the water level of deaerator storage tank 1 is fallen after rise.Because being the order along first low-pressure heater 211, second low-pressure heater 213, the 3rd low-pressure heater 215 and the 4th low-pressure heater 217, condensate water heated gradually, therefore, the temperature of condensate water in the first low-pressure heater shunt valve 23 is relatively low.Deoxygenation water level isolating door 233 and deoxygenation water level adjustment door 231 are arranged in the first low-pressure heater shunt valve 23, can reduce deoxygenation water level isolating door 233 and deoxygenation water level and adjust the parameter request of door 231, thereby reduction deoxygenation water level isolating door 233 and deoxygenation water level are adjusted the cost of investment of door 231.In addition, according to embodiments of the invention, deoxygenation water level isolating door 233 has two, is connected to the both sides that the deoxygenation water level is adjusted door 231, thereby is convenient to realize the maintenance of condensing water flow control and pipeline.
According to above-mentioned, in the condensate water circulatory system provided by the invention, adjust door 231 with deoxygenation water level isolating door 233 and deoxygenation water level and replace deaerator level adjustment unit 900 of the prior art, can realize equally the water level adjustment of deaerator storage tank 1, therefore effectively reduce equipment investment cost.And, because deoxygenation water level isolating door 233 and 231 at deoxygenation water level adjustment door use, especially effectively reduced the throttling loss of system in unit starting and stopped process.
On the other hand, the present invention also provides the another kind of embodiment of the condensate water circulatory system.With reference to figure 5 and Fig. 7, in the present embodiment, the condensate pump unit 4 of the condensate water circulatory system comprises three frequency converters 41, and three condensate pumps 43 that driven one to one by three frequency converters 41 respectively.Wherein, the maximum stream flow of every condensate pump 43 be the condensate water circulatory system maximum stream flow 35%.Other structures of the condensate water circulatory system in the present embodiment and the difference of the condensate water circulatory system in the previously described embodiment only are, in the present embodiment, remove recirculation strand 3.Therefore, omit the description of same structure part herein.
The same with aforesaid embodiment, in the present embodiment, under the operating mode of the normal operation of unit, can realize the water level adjustment of deaerator storage tank 1 by the speed governing of frequency converter 41.Under unit starting and operating mode out of service, if the water level of deaerator storage tank 1 is lower than normal operating water level, can open deoxygenation water level isolating door 233 and deoxygenation water level adjustment door 231 so that the water level of deaerator storage tank 1 gos up fast.But, in the present embodiment, if the water level of deaerator storage tank 1 is higher than normal operating water level under unit starting and operating mode out of service, the shunting of can be only reclaiming branch road 7 by condensate water realizes making the water level of deaerator storage tank 1 to fall after rise.The reasons are as follows:
When the percentage of the maximum stream flow of the shared condensate water circulatory system of the maximum stream flow of condensate pump 43 not simultaneously, the minimum discharge of condensate pump 43 is also different.As shown in table 1, describe as an example of the parameter configuration of 1000MW unit condensate pump example.
Table 11000MW unit condensate pump design parameter
In unit starting and the stopped process, the demand of condensing water flow is mostly between 100t/h～200t/h.In the present embodiment, the maximum stream flow of every condensate pump 43 be the condensate water circulatory system maximum stream flow 35%, the minimum discharge of condensate pump 43 is about 200t/h.This minimum discharge is close to the demand of condensing water flow in unit starting and the stopped process, therefore, under the common adjusting of the shunting action that speed adjusting performance and the condensate water of frequency converter 41 reclaims branch road 7, can realize the adjusting of the water level of deaerator storage tank 1 fully.And after removing recirculation strand 3, can further reduce equipment investment cost, and reduce throttling loss and the system noise of system.
Below describe by reference to the accompanying drawings preferred embodiment of the present invention in detail; but; the present invention is not limited to the detail in the above-mentioned embodiment; in technical conceive scope of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
Need to prove that in addition each the concrete technical characterictic described in the above-mentioned specific embodiment in reconcilable situation, can make up by any suitable mode.For fear of unnecessary repetition, the present invention is to the no longer separately explanation of various possible combinations.
In addition, also can carry out any combination between the various embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. the condensate water circulatory system in a power plant is characterized in that, this condensate water circulatory system comprises:
Condensate pump unit (4), this condensate pump unit (4) comprises three frequency converters (41), and three condensate pumps (43) that driven by described three frequency converters (41) respectively, the outlet pipe of these three condensate pumps (43) forms the jellyfish pipe (8) that condenses;
Deaerator storage tank (1);
Low-pressure heater unit (2), the water inlet of this low-pressure heater unit (2) are connected to the described jellyfish pipe (8) that condenses, and delivery port is connected to described deaerator storage tank (1); This low-pressure heater unit (2) comprises in sequential series along the flow direction of condensate water and is arranged in parallel a plurality of low-pressure heaters of low-pressure heater shunt valve;
Recirculation strand (3), this recirculation strand (3) are arranged on the described jellyfish pipe (8) that condenses between the water inlet of described three condensate pumps (43);
Condensate water subsidiary water tank (6); And
Condensate water reclaims branch road (7), and this condensate water reclaims branch road (7) and is arranged on described condensing between jellyfish pipe (8) and the described condensate water subsidiary water tank (6);
Wherein, be provided with the water level signal control module of regulating the rotating speed of described three condensate pumps (43) of the described deaerator storage tank of response (1) on the described frequency converter (41); And
Be provided with the deoxygenation water level at described low-pressure heater shunt valve and adjust door (231) and deoxygenation water level isolating door (233).
2. the condensate water circulatory system in power plant according to claim 1 is characterized in that, the maximum stream flow of every described condensate pump (43) be the condensate water circulatory system maximum stream flow 35%.
3. the condensate water circulatory system in power plant according to claim 1 and 2, it is characterized in that, each low-pressure heater of described a plurality of low-pressure heaters is respectively arranged with low-pressure heater shunt valve separately, is connected by condensate pipe between each low-pressure heater shunt valve;
Wherein, the low-pressure heater shunt valve of the low-pressure heater shunt valve of first low-pressure heater (211) and second low-pressure heater (213) is connected in series and forms the first low-pressure heater shunt valve (23); And
Described deoxygenation water level is adjusted door (231) and deoxygenation water level isolating door (233) is connected in series in this first low-pressure heater shunt valve (23); Wherein, described deoxygenation water level isolating door (233) has two, is connected to the both sides that described deoxygenation water level is adjusted door (231).
4. the condensate water circulatory system in power plant according to claim 3, it is characterized in that, the described condensate water circulatory system comprises the first condenser (51) and the second condenser (53) of collecting exhaust steam and exhaust steam being cooled to condensate water, and the first condensate tank (511) and the second condensate tank (531) that lay respectively at the bottom of described the first condenser (51) and the second condenser (53);
Wherein, described the first condensate tank (511) be connected the delivery port of condensate tank (531) and connect the water inlet of described three condensate pumps (43); And
Described first low-pressure heater (211) and second low-pressure heater (213) are separately positioned in described the first condenser (51) and the second condenser (53).
5. the condensate water circulatory system in power plant according to claim 4 is characterized in that, described recirculation strand (3) comprising:
Recirculation main line (31), the water inlet of this recirculation main line (31) connects the described jellyfish pipe (8) that condenses, the delivery port of this recirculation main line (31) connects the water inlet of described the first condensate tank (511) and/or the second condensate tank (531), along the flow direction of condensate water, upper the first recirculation isolating door (311), recirculation adjustment door (315) and the second recirculation isolating door (313) of being connected with in sequential series of described recirculation main line (31); And
Recirculation bypass (33), this recirculation bypass (33) is arranged in parallel with described recirculation main line (31).
6. the condensate water circulatory system in power plant according to claim 5, it is characterized in that, be connected with the moisturizing water pump that condensate water is pumped into described the first condensate tank (511) and/or the second condensate tank (531) from described condensate water subsidiary water tank (6) between the water inlet of described condensate water subsidiary water tank (6) and described the first condensate tank (511) and/or the second condensate tank (531).
7. the condensate water circulatory system in a power plant is characterized in that, this condensate water circulatory system comprises:
Condensate pump unit (4), this condensate pump unit (4) comprises three frequency converters (41), and three condensate pumps (43) that driven by described three frequency converters (41) respectively, the maximum stream flow of every described condensate pump (43) be the condensate water circulatory system maximum stream flow 35%; And the outlet pipe of these three condensate pumps (43) forms the jellyfish pipe (8) that condenses;
Deaerator storage tank (1);
Low-pressure heater unit (2), the water inlet of this low-pressure heater unit (2) are connected to the described jellyfish pipe (8) that condenses, and delivery port is connected to described deaerator storage tank (1); This low-pressure heater unit (2) comprises in sequential series along the flow direction of condensate water and is arranged in parallel a plurality of low-pressure heaters of low-pressure heater shunt valve;
Condensate water subsidiary water tank (6); And
Condensate water reclaims branch road (7), and this condensate water reclaims branch road (7) and is arranged on described condensing between jellyfish pipe (8) and the described condensate water subsidiary water tank (6);
Wherein, be provided with the water level signal control module of regulating the rotating speed of described three condensate pumps (43) of the described deaerator storage tank of response (1) on the described frequency converter (41); And
Be provided with the deoxygenation water level at described low-pressure heater shunt valve and adjust door (231) and deoxygenation water level isolating door (233).
8. the condensate water circulatory system in power plant according to claim 7, it is characterized in that, each low-pressure heater of described a plurality of low-pressure heaters is respectively arranged with low-pressure heater shunt valve separately, is connected by condensate pipe between each low-pressure heater shunt valve;
The low-pressure heater shunt valve of the low-pressure heater shunt valve of first low-pressure heater (211) and second low-pressure heater (213) is connected in series and forms the first low-pressure heater shunt valve (23); And
Described deoxygenation water level is adjusted door (231) and deoxygenation water level isolating door (233) is connected in series in this first low-pressure heater shunt valve (23); Wherein, described deoxygenation water level isolating door (233) has two, is connected to the both sides that described deoxygenation water level is adjusted door (231).
9. the condensate water circulatory system in power plant according to claim 8, it is characterized in that, the described condensate water circulatory system comprises the first condenser (51) and the second condenser (53) of collecting exhaust steam and exhaust steam being cooled to condensate water, and the first condensate tank (511) and the second condensate tank (531) that lay respectively at the bottom of described the first condenser (51) and the second condenser (53);
Wherein, described the first condensate tank (511) be connected the delivery port of condensate tank (531) and connect the water inlet of described three condensate pumps (43); And
Described first low-pressure heater (211) and second low-pressure heater (213) are separately positioned in described the first condenser (51) and the second condenser (53).
10. the condensate water circulatory system in power plant according to claim 9, it is characterized in that, be connected with the moisturizing water pump that condensate water is pumped into described the first condensate tank (511) and/or the second condensate tank (531) from described condensate water subsidiary water tank (6) between the water inlet of described condensate water subsidiary water tank (6) and described the first condensate tank (511) and/or the second condensate tank (531).
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| CN201310025009.3A CN103062755B (en) | 2013-01-23 | 2013-01-23 | Condensation water circulating system of power station |
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| CN201310025009.3A CN103062755B (en) | 2013-01-23 | 2013-01-23 | Condensation water circulating system of power station |
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