CN107621175A - A kind of thermal power plant cold end system and its control method - Google Patents
A kind of thermal power plant cold end system and its control method Download PDFInfo
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- CN107621175A CN107621175A CN201710842105.5A CN201710842105A CN107621175A CN 107621175 A CN107621175 A CN 107621175A CN 201710842105 A CN201710842105 A CN 201710842105A CN 107621175 A CN107621175 A CN 107621175A
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Abstract
The present invention relates to a kind of thermal power plant cold end system and its control method, it is characterised in that：Including condenser, circulating water outlet pipeline, cooling tower, circulating water intake path, frequency variable circulating pump and circulating water intake pipeline, one end of circulating water outlet pipeline is connected to the water side outlet of condenser, the other end of circulating water outlet pipeline is connected to the import of cooling tower, the outlet of cooling tower is connected with the one end in circulating water intake path, the other end in circulating water intake path is connected with the entrance of frequency variable circulating pump, one end of circulating water intake pipeline is connected with the outlet of frequency variable circulating pump, the other end of circulating water intake pipeline is connected with the water side entrance of condenser, condenser is connected with steam inlet and condenses water exit conduit.The present invention is reasonable in design, and design is unique, by considering to thermal power plant cold end system, comprising the optimization design to condenser, water circulating pump, cooling tower and pumped vacuum systems, can effectively reduce condenser pressure, reduce unit coal consumption of power supply.
Description
Technical field
The present invention relates to a kind of cold end system optimization structure and method, particularly a kind of thermal power plant cold end system and its
Control method, it is mainly used in thermal power plant.
Background technology
For thermal power generation unit, the running situation of cold end system has significant impact to unit heat economy, wherein
Condenser pressure is an important indicator parameter.Research shows that condenser pressure often raises 1kPa, and the coal consumption of power supply of unit will
Rise 3g/ (kWh).And with the long-play of unit, the problems such as due to ageing equipment, fouling and abrasion, cause to follow
Ring water parameter is not up to standard, cooling tower cooling capacity deficiency, heat exchange tube of condenser Shu Fasheng are leaked, condenser vacuum is unable to maintain that
Problem, its final result are condenser pressure rises, influence the economy of unit.
In addition, for only having carried out condenser retrofit and unit that water circulating pump and cooling tower are not transformed, system are being run
In easily there is circulating water flow deficiency and cooling tower cooling capacity deficiency, the problem of causing condenser pressure to raise；And with catching fire
The execution of group of motors capacity-increasing transformation scheme, the cooling capacity deficiency problem of cold end system further highlight.Thus unit is also caused
Energy consumption be in higher level, pollutant discharge amount increase, these do not comply with country carry out energy-saving and emission-reduction upgrading action
The requirement of plan.
For the cold end system in thermal power plant, those skilled in the art has done substantial amounts of work sutdy, such as publication date
For August in 2016 4 days, in the Chinese patent of Publication No. 201620836461.7, a kind of Novel steam condenser is disclosed, the condensing
Device realizes the guiding shunting of steam, improves temperature uniformity coefficient in condenser, carry equipped with the bending cooling water pipe of reducing
The high heat exchange efficiency of condenser.But the cooling water pipe of the technology is swan-neck, the difficulty of the manufacture of its tubing and site operation compared with
Greatly.And for example, publication date is September in 2015 2, in the Chinese patent of Publication No. 201310193085.5, discloses a kind of change
Frequency water circulating pump realizes unit cold end system energy-saving automatic control method, by automatically adjusting for variable frequency pump, optimizes cold end system
The method of operation for each equipment of uniting, realize that unit optimum vacuum is run, reach the purpose of Energy-saving for Thermal Power Units consumption reduction.But the patent is only
Circulation part is considered, cold end system is not considered.
In summary, there is presently no a kind of reasonable in design, design is unique, can effectively reduce condenser pressure,
Reduce the cold end optimization system of unit coal consumption of power supply.
The content of the invention
It is an object of the invention to overcome above shortcomings in the prior art, and offer is a kind of reasonable in design,
Design is unique, can effectively reduce condenser pressure, the thermal power plant cold end system for reducing unit coal consumption of power supply and its control
Method processed.
Technical scheme is used by the present invention solves the above problems：A kind of thermal power plant cold end system, its feature exist
In：Including condenser, circulating water outlet pipeline, cooling tower, circulating water intake path, frequency variable circulating pump and circulating water intake pipe
Road, one end of circulating water outlet pipeline are connected to the water side outlet of condenser, and the other end of circulating water outlet pipeline is connected to cold
But the import of tower, the outlet of cooling tower are connected with the one end in circulating water intake path, the other end in circulating water intake path and change
The entrance of frequency circulating pump is connected, and one end of circulating water intake pipeline is connected with the outlet of frequency variable circulating pump, circulating water intake pipeline
The other end be connected with the water side entrance of condenser, condenser be connected with steam inlet and condense water exit conduit.
Present invention additionally comprises extraction line, Roots vaccum pump, electric control valve and twin-stage water-ring vacuum pump, motorized adjustment
Valve is connected by extraction line with condenser, and Roots vaccum pump is connected with electric control valve, Roots vaccum pump and twin-stage liquid-ring type
Vavuum pump is connected.
Present invention additionally comprises pressure gauge, pressure gauge is connected with condenser.
Present invention additionally comprises terminal control unit, terminal control unit is connected with frequency variable circulating pump, terminal control unit and pressure gauge
Connection, terminal control unit are connected with electric control valve.
A kind of control method of thermal power plant cold end system, comprises the following steps：Steam is entered by steam inlet
Enter condenser, steam turns into condensate in condenser by circulating water, and condensate is drawn by condensing water exit conduit；Follow
Ring water absorbs the heat heating of steam in condenser, and the recirculated water after heating is carried out through circulating water outlet pipeline into cooling tower
Cooling, recirculated water after cooling enter again by frequency variable circulating pump, circulating water intake pipeline successively through circulating water intake path
Enter in condenser and steam heat-exchanging.
The present invention monitors the pressure in condenser by pressure gauge, ensures that condenser is run under optimum operating condition, now coagulates
Pressure in vapour device is optimal condenser pressure；When the pressure in condenser is higher than optimal condenser pressure, feedback signal is extremely
Terminal control unit, terminal control unit regulation frequency variable circulating pump, increase flow through the quantity of circulating water of condenser, increase steam in condenser
With the heat exchange amount of recirculated water, the pressure in condenser is reduced, condenser is run under optimal condenser pressure；And pass through terminal
Controller adjusts electric control valve, adjusts the operating condition of pumped vacuum systems, maintains optimal condenser pressure.
The present invention is compared with prior art, reasonable in design, and design is unique, by examining the synthesis of thermal power plant cold end system
Consider, comprising the optimization design to condenser, water circulating pump, cooling tower and pumped vacuum systems, can effectively reduce condenser pressure, drop
Low unit coal consumption of power supply；Pumped vacuum systems uses Roots-water-ring vacuum pump unit, can effectively avoid the problem of cavitation of pump,
Condenser vacuum quickly is established, contributes to the operation of condenser pressure to maintain；Meanwhile using the technology of the present invention avoid just for
The a certain part of cold end system carries out the problem of cooling capacity deficiency that transformation is brought.Meanwhile with the drop of unit coal consumption of power supply
It is low, the discharge of pollutant can be effectively reduced, environmental benefit is notable.
Brief description of the drawings
Fig. 1 is the main structure diagram of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawings and the present invention is described in further detail by embodiment, and following examples are to this hair
Bright explanation and the invention is not limited in following examples.
Embodiment.
Referring to Fig. 1.
The present embodiment is a kind of thermal power plant cold end system, including condenser 4, circulating water outlet pipeline 11, cooling tower
9th, circulating water intake path 8, frequency variable circulating pump 7, pressure gauge 12, extraction line 14, Roots vaccum pump 2, electric control valve 3, end
Side controller 10, twin-stage water-ring vacuum pump 1 and circulating water intake pipeline 6.
One end of circulating water outlet pipeline 11 is connected to the water side outlet of condenser 4, circulating water outlet pipeline 11 it is another
End is connected to the import of cooling tower 9, and the outlet of cooling tower 9 is connected with the one end in circulating water intake path 8, circulating water intake path
8 other end is connected with the entrance of frequency variable circulating pump 7, one end of circulating water intake pipeline 6 and the outlet phase of frequency variable circulating pump 7
Even, the other end of circulating water intake pipeline 6 is connected with the water side entrance of condenser 4, and condenser 4 is connected with steam inlet 13
With condensation water exit conduit 5.
Electric control valve 3 is connected by extraction line 14 with condenser 4, and Roots vaccum pump 2 is connected with electric control valve 3,
Roots vaccum pump 2 is connected with twin-stage water-ring vacuum pump 1.Extraction line 14, electric control valve 3, Roots vaccum pump 2 and twin-stage water
Ring vacuum pumps 1 are set along steam flow direction.
Terminal control unit 10 is connected by wire with frequency variable circulating pump 7, and terminal control unit 10 passes through wire and pressure gauge 12
Connection, terminal control unit 10 are connected by wire with electric control valve 3.Pressure gauge 12 is connected with condenser 4.
The condenser 4 of the present embodiment is the condenser 4 of the novel pipe laying mode after optimization.
The cooling tower 9 of the present embodiment is the cooling tower 9 using not contour filler arrangement.
The present embodiment additionally provides the control method of thermal power plant cold end system, comprises the following steps：
Steam enters condenser 4 by steam inlet 13, and steam turns into condensate in condenser 4 by circulating water,
Condensate is drawn by condensing water exit conduit 5.
Recirculated water absorbs the heat heating of steam in condenser 4, and the recirculated water after heating is through circulating water outlet pipeline 11
Cooled down into cooling tower 9, recirculated water after cooling is through circulating water intake path 8 successively by frequency variable circulating pump 7, circulation
Water inlet pipeline 6 is again introduced into condenser 4 and steam heat-exchanging.
The present invention monitors the pressure in condenser 4 by pressure gauge 12, ensures that condenser 4 is run under optimum operating condition, this
When condenser 4 in pressure be optimal condenser pressure.Optimum operating condition and optimal condenser pressure can be according to this area skills
Art personnel actual demand choose, in the absence of scope it is unclear the problem of.Optimal condenser pressure is actual setting value.
When the pressure in condenser 4 is higher than optimal condenser pressure, feedback signal to terminal control unit 10, terminal control
Device 10 adjusts frequency variable circulating pump 7, and increase flows through the quantity of circulating water of condenser 4, increases the heat exchange of steam and recirculated water in condenser 4
Amount, the pressure in condenser 4 is reduced, condenser 4 is run under optimal condenser pressure；And adjusted by terminal control unit 10
Electric control valve 3, the operating condition of pumped vacuum systems is adjusted, maintain optimal condenser pressure.
The present embodiment by considering to thermal power plant cold end system, comprising to condenser 4, frequency variable circulating pump 7,
The optimization design of cooling tower 9 and pumped vacuum systems, it can effectively reduce condenser pressure, reduce unit coal consumption of power supply；Vacuumize
System uses Roots-water-ring vacuum pump unit, can effectively avoid the problem of cavitation of pump, quickly establish condenser vacuum, help
Maintained in the operation of condenser pressure；Meanwhile avoid the cooling energy for carrying out transformation just for a certain part of cold end system and bringing
Hypodynamic problem.In addition, with the reduction of unit coal consumption of power supply, the discharge of pollutant can be effectively reduced, environmental benefit shows
Write.System structure design is reasonable, and design is unique, dependable performance.
Furthermore, it is necessary to illustrate, the specific embodiment described in this specification, the shape of its parts and components, it is named
Title etc. can be different, and the above content described in this specification is only to structure example explanation of the present invention.It is all according to
The equivalence changes or simple change done according to the construction described in inventional idea of the present invention, feature and principle, are included in this hair
In the protection domain of bright patent.Those skilled in the art can do various to described specific embodiment
The modification of various kinds or supplement are substituted using similar mode, without departing from structure of the invention or surmount present claims
Scope defined in book, protection scope of the present invention all should be belonged to.
Claims (6)
- A kind of 1. thermal power plant cold end system, it is characterised in that：Including condenser, circulating water outlet pipeline, cooling tower, circulation Water inlet path, frequency variable circulating pump and circulating water intake pipeline, one end of circulating water outlet pipeline are connected to the water side of condenser Outlet, the other end of circulating water outlet pipeline are connected to the import of cooling tower, outlet and the circulating water intake path of cooling tower One end is connected, and the other end in circulating water intake path is connected with the entrance of frequency variable circulating pump, one end of circulating water intake pipeline with The outlet of frequency variable circulating pump is connected, and the other end of circulating water intake pipeline is connected with the water side entrance of condenser, condenser connection There is steam inlet and condense water exit conduit.
- 2. thermal power plant cold end system according to claim 1, it is characterised in that：Also include extraction line, Luo Cizhen Empty pump, electric control valve and twin-stage water-ring vacuum pump, electric control valve are connected by extraction line with condenser, Roots vacuum Pump is connected with electric control valve, and Roots vaccum pump is connected with twin-stage water-ring vacuum pump.
- 3. thermal power plant cold end system according to claim 2, it is characterised in that：Also include pressure gauge, pressure gauge with Condenser is connected.
- 4. thermal power plant cold end system according to claim 3, it is characterised in that：Also include terminal control unit, terminal Controller is connected with frequency variable circulating pump, and terminal control unit is connected with pressure gauge, and terminal control unit is connected with electric control valve.
- 5. a kind of control method of thermal power plant cold end system as described in claim 1-4 any claims, its feature It is：Comprise the following steps：Steam enters condenser by steam inlet, steam in condenser by circulating water into For condensate, condensate is drawn by condensing water exit conduit；Recirculated water absorbs the heat heating of steam, heating in condenser Recirculated water afterwards is cooled down through circulating water outlet pipeline into cooling tower, and recirculated water after cooling is through circulating water intake path Pass through frequency variable circulating pump successively, circulating water intake pipeline is again introduced into condenser and steam heat-exchanging.
- 6. the control method of thermal power plant cold end system according to claim 5, it is characterised in that：Supervised by pressure gauge The pressure surveyed in condenser, ensures that condenser is run under optimum operating condition, now the pressure in condenser is optimal condenser pressure Power；When the pressure in condenser is higher than optimal condenser pressure, feedback signal to terminal control unit, terminal control unit regulation becomes Frequency circulating pump, increase flow through the quantity of circulating water of condenser, increase the heat exchange amount of steam and recirculated water in condenser, reduce condenser Interior pressure, condenser is set to run under optimal condenser pressure；And electric control valve is adjusted by terminal control unit, regulation is taken out The operating condition of vacuum system, maintain optimal condenser pressure.
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| CN201710842105.5A CN107621175A (en) | 2017-09-18 | 2017-09-18 | A kind of thermal power plant cold end system and its control method |
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| CN201710842105.5A CN107621175A (en) | 2017-09-18 | 2017-09-18 | A kind of thermal power plant cold end system and its control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111156831A (en) * | 2019-12-30 | 2020-05-15 | 华润电力技术研究院有限公司 | Cold end optimization method, data processing system and computer storage medium |
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| WO2016042538A2 (en) * | 2014-09-13 | 2016-03-24 | Citrotec Indústria E Comércio Ltda | Vacuum condensation system by using evaporative condenser and air removal system coupled to condensing turbines in thermoelectric plants |
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| CN107144150A (en) * | 2017-06-23 | 2017-09-08 | 中国船舶重工集团公司第七〇九研究所 | A kind of Staged cotrol method of condenser vacuum |
| CN207247938U (en) * | 2017-09-18 | 2018-04-17 | 杭州华电能源工程有限公司 | A kind of thermal power plant cold end system |
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2017
- 2017-09-18 CN CN201710842105.5A patent/CN107621175A/en active Pending
Patent Citations (5)
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| CN101769552A (en) * | 2008-12-29 | 2010-07-07 | 河北盛华化工有限公司 | Low-vacuum-operating circulating water heating system of steam turbine in thermal power plant |
| WO2016042538A2 (en) * | 2014-09-13 | 2016-03-24 | Citrotec Indústria E Comércio Ltda | Vacuum condensation system by using evaporative condenser and air removal system coupled to condensing turbines in thermoelectric plants |
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| CN107144150A (en) * | 2017-06-23 | 2017-09-08 | 中国船舶重工集团公司第七〇九研究所 | A kind of Staged cotrol method of condenser vacuum |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111156831A (en) * | 2019-12-30 | 2020-05-15 | 华润电力技术研究院有限公司 | Cold end optimization method, data processing system and computer storage medium |
| CN111156831B (en) * | 2019-12-30 | 2021-06-29 | 华润电力技术研究院有限公司 | Cold end optimization method, data processing system and computer storage medium |
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