CN101936669B - Hybrid composite condensation method and condenser - Google Patents

Hybrid composite condensation method and condenser Download PDF

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Publication number
CN101936669B
CN101936669B CN2010102698715A CN201010269871A CN101936669B CN 101936669 B CN101936669 B CN 101936669B CN 2010102698715 A CN2010102698715 A CN 2010102698715A CN 201010269871 A CN201010269871 A CN 201010269871A CN 101936669 B CN101936669 B CN 101936669B
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condenser
vaporation
type condenser
condensate
air cooling
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CN101936669A (en
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董晓强
李占强
李俊梅
杜少旭
申德用
李卫
张勤铎
金元勇
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Longhua Technology Group (Luoyang) Limited by Share Ltd
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Luoyang Longhua Heat Transfer Technology Corp
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Abstract

The invention discloses a hybrid and composite condensation method and a condenser. An air-cooled condenser (13) and a first evaporative condenser (16) are connected in parallel to exchange heat; waste steam delivered by a steam exhaust pipeline of a steam turbine is delivered to an air-cooled heat exchange downstream tube bundle of the air-cooled condenser (13) and an evaporative heat exchange downstream tube bundle of the first evaporative condenser (16) through a steam distribution pipe (12) for parallel heat exchange; and the waste steam which is subjected to parallel heat exchange performs serial heat exchange with an evaporative heat exchange counter-flow tube bundle of a second evaporative condenser. The condenser has the water-saving advantages of the air-cooled condenser and the advantages of high heat exchange efficiency, energy conservation, low condensation back pressure and the like of the evaporative condenser; and a system runs stably, safely and reliably.

Description

Compound condensing method of a kind of series parallel type and condenser
Technical field
The present invention relates to the condenser technical field of exhaust steam condensation, relate in particular to compound condensing method of a kind of series parallel type and condenser.
Background technology
At present; The process that condensing power plant produces electric energy is the process of a power conversion; The chemical energy that is fuel is transformed into saturated vapor through boiler 1 with water, and saturated vapor becomes superheated steam after superheater 2 is overheated, the superheated steam acting of in steam turbine 3, expanding; Change the heat energy of steam into mechanical energy, through generator 4 the most at last mechanical energy convert electric energy to.The low-pressure saturated steam that expands after doing work is condensed into condensate through condenser 5; Deliver to condensate polishing system by condensate pump 6 then, get back to boiler 1 recycle after the processing, promptly deliver to condensate precision processing center 7 and handle by condensate pump 6; Condensate after the processing gets into deaerating plant 9 after low-pressure heater 8 heating; Deliver to high-pressure heater 11 by feed pump 10 again, permanent set water is got back to boiler 1 recycle once more, and is as shown in Figure 1.
In order to improve the conversion ratio of energy, reduce thermal loss as far as possible, the efficient of the core steam turbine 3 of raising system is particularly crucial.The condensing effect of condenser 5 has determined the vacuum of steam turbine in power plant system, and the vacuum of steam turbine directly affects the efficient of steam turbine 3, so the choose reasonable of condenser 5 plays key effect to the efficient of power plant.
Be rich coal and the area of lack of water in NORTHWEST CHINA, North China, so power plant has all adopted Direct Air-Cooled formula condensing system mostly, but when summer or environment temperature were higher, air cooling condensing effect descended significantly, and the generated energy of unit also descends thereupon; And be peak times of power consumption summer, and low excessively generating efficiency has a strong impact on the normal operation of national economic system, and the solution of this problem is imminent.Normal direct air cooling system and the indirect air cooling system of adopting in the existing power plant condensing system; Said direct air cooling system; Adopt turbine discharge to deliver in the finned-tube bundle of air cooling tubes condenser 13 through steam-distributing pipe 12; The cooling air condenses through the steam that axial flow blower 14 will flow in will managing outside finned tube, and condensate entering condensate tank 15 backs that obtain are delivered to boiler by condensate pump 6 and carried out recycle.This system does not need intermediate cooling mediums such as cooling water, and initial temperature differences is big.Equipment is few, and system is simple, and capital expenditure is less, takes up an area of few.The adjusting of air capacity is flexible, and the preventing freeze in winter measure is reliable.But, also increased noise simultaneously because Direct Air-Cooled adopts forced ventilation mostly, thereby has increased the station-service electric weight.And its heat exchange effect is subject to external environment dry bulb temperature ball impact, and temperature is high eventually by cold medium, and back pressure is high, generating efficiency is unstable.And the Hai Le system of indirect air cooling system and Harmon system equipment are complicated, investment, production cost height.
Summary of the invention
For solving the problems of the technologies described above, the present invention provides compound condensing method of a kind of series parallel type and condenser; The advantage of existing air cooling tubes condenser water saving has advantages such as vaporation-type condenser heat exchange efficiency is high, energy-conservation, the condensing back pressure is low again; And system is stable, and is safe and reliable.
For realizing the foregoing invention purpose, the present invention adopts following technical scheme:
The compound condensing method of a kind of series parallel type; Adopt the air cooling tubes condenser and the first vaporation-type condenser parallel heat exchanging, the evaporation and heat-exchange following current that the exhaust steam that the turbine discharge pipeline is carried is delivered to air cooling heat exchange following current tube bank and the first vaporation-type condenser of air cooling tubes condenser through steam-distributing pipe is restrained and is carried out parallel heat exchanging; Condensate comes together in the bottom of condensate header, and the exhaust steam behind parallel heat exchanging is restrained the heat exchange of connecting with the evaporation and heat-exchange adverse current of the second vaporation-type condenser again; Be about to the adverse current that uncooled exhaust steam is delivered to the second vaporation-type condenser by the condensate header after the following current tube bank heat exchange of following current tube bank and the first vaporation-type condenser through air cooling tubes condenser and restrain, carry out evaporation and heat-exchange once more; In the condensate header in condensate falling to the second vaporation-type condenser of condensation, get into condensate tank through pipeline and send into the condensate polishing system recycle by condensate pump; Incoagulable gas is discharged by pumped vacuum systems on the adverse current tube bank top of the second vaporation-type condenser.
A kind of series parallel type condenser; Comprise: air cooling tubes condenser, the first vaporation-type condenser, the second vaporation-type condenser; The steam-distributing pipe of carrying blow-off line to be communicated with steam turbine directly feeds the air cooling tubes condenser and the first vaporation-type condenser; Steam-distributing pipe is communicated with the condensate header through the following current tube bank of air cooling tubes condenser, the following current tube bank of the first vaporation-type condenser; The condensate header is communicated with pumped vacuum systems through the tube bank of the second vaporation-type condenser adverse current; The adverse current tube bank of the second vaporation-type condenser is communicated with the condensate header, and the end of second vaporation-type condenser adverse current tube bank is provided with pumped vacuum systems, and said condensate header is communicated with condensate tank through pipeline.
Described series parallel type condenser, the top of air cooling tubes condenser is provided with axial flow blower.
Described series parallel type condenser, the first vaporation-type condenser is provided with spray system, water collection device, axial flow blower; The condensate header below of the first vaporation-type condenser is provided with air intake window and water tank.
Described series parallel type condenser, the second vaporation-type condenser is provided with spray system, water collection device, axial flow blower; The condensate header below of the second vaporation-type condenser is provided with air intake window and water tank.
Because adopt aforesaid technical scheme, the present invention has following superiority:
1, the advantage of existing air cooling tubes condenser heat exchange water saving has advantages such as vaporation-type condenser heat exchange efficiency is high, energy-conservation, the condensing back pressure is low again; And system is stable, and is safe and reliable.
When 2, air cooling tubes condenser can satisfy system's needs when environment temperature is low, the vaporation-type condenser can be sentenced closed condition, and condenser is water consumption not fully.
3, when environment temperature is higher than a certain temperature, when air cooling tubes condenser can not be satisfied the demand, open the vaporation-type condenser, because of the vaporation-type condenser adopts the latent heat heat transfer mechanism, good effect of heat exchange, the condensing back pressure is low, and water consumption is little; The overall water consumption of condenser is little.
Description of drawings
Fig. 1 is existing direct air cooled condenser user mode figure;
Fig. 2 is the exhaust steam of the present invention user mode sketch map that condenses;
Among the figure: 1-boiler, 2-superheater, 3-steam turbine, 4-generator, 5-condenser; The 6-condensate pump, 7-condensate precision processing center, 8-low-pressure heater, 9-deaerating plant, 10-feed pump; The 11-high-pressure heater, 12-steam-distributing pipe, 13-air cooling tubes condenser, 14-axial flow blower, 15-condensate tank; The 16-first vaporation-type condenser, the 17-second vaporation-type condenser, 18-pumped vacuum systems, 19-condensate header.
The specific embodiment
As shown in Figure 2: the compound condensing method of a kind of series parallel type; Adopt air cooling tubes condenser parallelly connected with the first vaporation-type condenser; The series parallel type condenser of connecting with the second vaporation-type condenser again and constituting, in the series parallel type condenser, exhaust steam gets into air cooling tubes condenser 13 following currents tube bank and the first vaporation-type condenser, 16 following currents tube bank through steam-distributing pipe 12; And air cooling tubes condenser 13 following currents tube bank is the air cooling heat exchange, and the first vaporation-type condenser, 16 following currents tube bank is evaporation and heat-exchange; Uncooled exhaust steam gets into the intrafascicular evaporation and heat-exchange that carries out once more of the second vaporation-type condenser, 17 reverse stream pipes along condensate header 19 in air cooling tubes condenser 13 following currents tube bank and the first vaporation-type condenser, the 16 following currents tube bank; Incoagulable gas is discharged through the pumped vacuum systems 18 on the second vaporation-type condenser, 17 adverse currents tube bank top, comes together in the condensate in the condensate header 19, introduces condensate tank 15 through pipeline, delivers to the condensate polishing system recycle by condensate pump 6 again.
As shown in Figure 2: a kind of series parallel type condenser; Comprise: air cooling tubes condenser 13, the first vaporation-type condenser 16, the second vaporation-type condenser 17; The steam-distributing pipe 12 of carrying blow-off line to be communicated with steam turbine directly feeds air cooling tubes condenser, the first vaporation-type condenser, and the steam-distributing pipe 12 that is positioned at air cooling tubes condenser 13 is communicated with condensate header 19 through the following current tube bank; The steam-distributing pipe 12 that is positioned at the first vaporation-type condenser 16 is communicated with condensate header 19 through the following current tube bank; The following current tube bank of air cooling tubes condenser, the following current tube bank of the first vaporation-type condenser are communicated with the adverse current tube bank of the second vaporation-type condenser through condensate header 19; The end of second vaporation-type condenser adverse current tube bank is provided with pumped vacuum systems 18; The condensate header is communicated with condensate tank 15 through pipeline 19.The top of said air cooling tubes condenser 13 is provided with axial flow blower 14.
Steam-distributing pipe 12 tops in the said first vaporation-type condenser 16 are provided with spray system, water collection device, axial flow blower; Condensate header 19 belows in the first vaporation-type condenser are provided with air intake window and water tank.
The said second vaporation-type condenser, 17 adverse currents tube bank top is provided with spray system, water collection device, axial flow blower; Condensate header 19 belows in the second vaporation-type condenser are provided with air intake window and water tank.
Compound condensing method of a kind of series parallel type and series parallel type condenser that the present invention proposes are to change the tube bank of the part in traditional air cooling tubes condenser into evaporation and heat-exchange by the air cooling heat exchange, are main with the air cooling heat exchange, and evaporation and heat-exchange is auxilliary.In the series-parallel connection condenser, adopt air cooling and the cold parallel heat exchanging of evaporation between the following current tube bank, the employing heat exchange of connecting between following current tube bank and the adverse current tube bank; Especially be useful in the condense application in field of general vapour.
A kind of course of work of series parallel type condenser: be that air cooling tubes condenser 13 is parallelly connected with the first vaporation-type condenser 16, the formation of connecting with the second vaporation-type condenser 17 again after the parallel connection; In the series-parallel connection condenser; Exhaust steam gets into air cooling tubes condenser 13 following currents tube bank and the first vaporation-type condenser, 16 following currents tube bank through steam-distributing pipe 12; And air cooling tubes condenser 13 following currents tube bank is the air cooling heat exchange; The first vaporation-type condenser, 16 following currents tube bank is evaporation and heat-exchange, because both are the parallel connection relation, so back pressure can be consistent.Air cooling tubes condenser 13 following currents tube bank and 16 following currents of the first vaporation-type condenser are restrained uncooled exhaust steam and are got into the intrafascicular evaporation and heat-exchange that carries out once more of the second vaporation-type condenser, 17 reverse stream pipes along condensate header 19.Incoagulable gas is discharged by pumped vacuum systems 18 on the second vaporation-type condenser, 17 adverse currents tube bank top; Condensate comes together in the condensate header 19; Pipeline through the second vaporation-type condenser 17 is provided with is introduced condensate tank 15, sends into the condensate polishing system recycle by condensate pump 6 again.

Claims (5)

1. compound condensing method of series parallel type; It is characterized in that: adopt the air cooling tubes condenser (13) and first vaporation-type condenser (16) parallel heat exchanging, the evaporation and heat-exchange following current that the exhaust steam that the turbine discharge pipeline is carried is delivered to air cooling heat exchange following current tube bank and the first vaporation-type condenser (16) of air cooling tubes condenser (13) through steam-distributing pipe (12) is restrained and is carried out parallel heat exchanging; Condensate comes together in the bottom of condensate header (19), and the exhaust steam behind parallel heat exchanging is restrained the heat exchange of connecting with the evaporation and heat-exchange adverse current of the second vaporation-type condenser (17) again; The following current that is about to following current tube bank and the first vaporation-type condenser (16) through air cooling tubes condenser (13) is restrained the adverse current that uncooled exhaust steam is delivered to the second vaporation-type condenser (17) by condensate header (19) after the heat exchange and is restrained, and carries out evaporation and heat-exchange once more; In the condensate header (19) in condensate falling to the second vaporation-type condenser (17) of condensation, get into condensate tank (15) through pipeline and send into the condensate polishing system recycle by condensate pump (6); Incoagulable gas is discharged by pumped vacuum systems (18) on the adverse current tube bank top of the second vaporation-type condenser (17).
2. implement a kind of series parallel type condenser of said method; It is characterized in that: comprising: air cooling tubes condenser (13), the first vaporation-type condenser (16), the second vaporation-type condenser (17); The steam-distributing pipe (12) of carrying blow-off line to be communicated with steam turbine directly feeds the air cooling tubes condenser (13) and the first vaporation-type condenser (16); Steam-distributing pipe (12) is communicated with condensate header (19) through the following current tube bank of air cooling tubes condenser (13), the following current tube bank of the first vaporation-type condenser (16); Condensate header (19) is communicated with pumped vacuum systems through the adverse current tube bank of the second vaporation-type condenser (17); The adverse current tube bank of the second vaporation-type condenser is communicated with condensate header (19), and the end of second vaporation-type condenser adverse current tube bank is provided with pumped vacuum systems (18), and said condensate header (19) is communicated with condensate tank (15) through pipeline.
3. series parallel type condenser as claimed in claim 2 is characterized in that: the top of air cooling tubes condenser (13) is provided with axial flow blower (14).
4. series parallel type condenser as claimed in claim 2 is characterized in that: the first vaporation-type condenser (16) is provided with spray system, water collection device, axial flow blower; Condensate header below in the first vaporation-type condenser (16) is provided with air intake window and water tank.
5. series parallel type condenser as claimed in claim 2 is characterized in that: the second vaporation-type condenser (17) is provided with spray system, water collection device, axial flow blower; The condensate header below of the second vaporation-type condenser (17) is provided with air intake window and water tank.
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CN102393153A (en) * 2011-07-11 2012-03-28 华东理工大学 Condensation mode and condensing unit of steam turbine set used in summer peak
CN102384670A (en) * 2011-10-11 2012-03-21 杭州杭氧换热设备有限公司 Auxiliary device for insufficient load of air cooling island of air separation plant in summer
US20140202151A1 (en) * 2013-01-21 2014-07-24 Alliance For Sustainable Energy, Llc Hybrid Air-Cooled Condenser For Power Plants and Other Applications
CN104279884B (en) * 2014-08-08 2016-11-02 北京大学包头创新研究院 A kind of direct air cooled condenser cooling system
RU2561799C1 (en) * 2014-08-14 2015-09-10 Акционерное общество "Опытное Конструкторское Бюро Машиностроения имени И.И. Африкантова" (АО "ОКБМ Африкантов") Air cooling heat exchange unit
WO2017031494A1 (en) 2015-08-20 2017-02-23 Holtec International Dry cooling system for powerplants
US10161683B2 (en) 2015-08-20 2018-12-25 Holtec International Dry cooling system for powerplants
CN105080177A (en) * 2015-09-14 2015-11-25 李永堂 Efficient separation and vacuum condensation system for non-condensable gas
DE102017130807A1 (en) * 2017-12-20 2019-06-27 Enexio Germany Gmbh Air-cooled condenser system
CN108662915A (en) * 2018-07-19 2018-10-16 河南省九冶化工设备有限公司 The indirect heat exchange vaporization type condensing system of the general vapour of concentration evaporator system end effect
CN113670085A (en) * 2021-08-13 2021-11-19 广州环投福山环保能源有限公司 Cold end optimization scheduling system and method for waste incineration power plant
CN113983452A (en) * 2021-09-18 2022-01-28 杭州中能汽轮动力有限公司 Parallel peak cooling air-cooled steam turbine generator unit and condensing method

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