CN1047435C - Utilization system of exhausted smoke waste heat in steam heat-recovering dynamic circulation - Google Patents

Utilization system of exhausted smoke waste heat in steam heat-recovering dynamic circulation Download PDF

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Publication number
CN1047435C
CN1047435C CN94119624A CN94119624A CN1047435C CN 1047435 C CN1047435 C CN 1047435C CN 94119624 A CN94119624 A CN 94119624A CN 94119624 A CN94119624 A CN 94119624A CN 1047435 C CN1047435 C CN 1047435C
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China
Prior art keywords
heat exchanger
pressure heater
afterheat heat
low
afterheat
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Expired - Fee Related
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CN94119624A
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CN1108745A (en
Inventor
徐永康
林万超
刘光铎
陈国慧
邢秦安
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Xian Jiaotong University
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Xian Jiaotong University
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Priority to CN94119624A priority Critical patent/CN1047435C/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00Climate change mitigation technologies for sector-wide applications
    • Y02P80/10Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y02P80/15On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply

Abstract

The present invention relates to an utilization system of exhausted smoke waste heat in steam heat-recovering dynamic circulation, which comprises a steam condenser, a low-pressure heater, a high-pressure heater and a deaerator, wherein a waste-heat exchanger is arranged in front of an air heat exchanger of a boiler; the low-pressure heater and the high-pressure heater are respectively formed into a mutually independent series and parallel structures through a valve and the waste-heat exchanger, and the structure is connected with the waste-heat exchanger. The present invention has the advantages that initial investment and a payback period of investment of a waste-heat utilization system are reduced, and energy-saving benefit is increased; the present invention is especially suitable for boiler and steam turbine systems in heat-engine plants with small arrangement space and a small pressure head of a draught fan.

Description

Smoke discharging residual heat utilizes system in steam backheat power cycle
The present invention relates to a kind of heat-exchange system, particularly a kind of boiler exhaust gas waste heat utilizes system in steam thermal power circulation.
Have the thermal power plant of steam backheat power cycle and enterprise with power plant for self-supply, there are various residual heat resources in process of production, as the power plant boiler smoke discharging residual heat, according to domestic unit significant problem findings of the survey, homemade 200mw and 300mw unit boiler exhaust gas temperature surpass design load 20-30 ℃ a lot of high the reaching more than 180 ℃ of situation, and it is the task of top priority that the boiler exhaust gas waste heat effectively utilizes.By foreign literature Some applications of the Low-level Econom-izer, Proc, Amer.Power.ConfVol. XX II, 1960 PP189-195 and domestic patent of invention: the low-pressure energy-saving hybrid system (patent of invention number 86105222.6) of utilizing the boiler exhaust gas waste heat as can be known, afterheat heat exchanger is arranged in the flue of boiler air preheater rear portion, because exhaust gas temperature is lower, brings following shortcoming:
1,, needs big arrangement space because the heat transfer temperature and pressure are low, and the afterheat heat exchanger heating surface area is bigger;
2, in order to guarantee necessarily to conduct heat temperature and pressure, the water inlet of afterheat heat exchanger can only be supplied with by the lower low-pressure heater of condensing water temperature, what save is the low-lying level extracted steam from turbine of a part of former heating low-temperature condensate, energy-saving benefit is lower, the afterheat heat exchanger heating surface area is bigger in addition, the cigarette resistance is also big, and the power consumption of deduction air-introduced machine makes energy-saving benefit lower.
In sum, the boiler exhaust gas bootstrap system of prior art situation, the afterheat heat exchanger heating surface area is big, the cigarette resistance is also big, initial cost is increased, and pay off period is longer, particularly to existing boiler, because arrangement space is little, do not arrange so much heating surface, and air-introduced machine since boiler operatiopn with the passing of time, the increase of leaking out, the blast surplus of air-introduced machine is little, and influence has applying of boiler exhaust gas bootstrap system now.
The objective of the invention is to overcome the shortcoming of above-mentioned prior art, propose a kind of smoke discharging residual heat and in steam backheat power cycle, utilize system, this system has reduced the initial cost and the pay off period of bootstrap system, improved energy-saving benefit, particularly also can be applied in arrangement space is less, the air-introduced machine pressure head is not fiery power plant boiler-thermodynamic system of steam tur.
Feature of the present invention is, before the air heat exchanger of boiler, arrange an afterheat heat exchanger, by afterheat heat exchanger with the condensate water in the smoke discharging residual heat heating therrmodynamic system, thereby got rid of be used for heat-setting water steam turbine one or more levels bleed, make it return expansion working generating in the steam turbine, realized the monoenergetic level and the utilization of multiple level gradient development of smoke discharging residual heat.
Fig. 1 is a systematic schematic diagram of the present invention.
Fig. 2 is one embodiment of the present of invention.
Fig. 3 is an alternative embodiment of the invention.
Below in conjunction with accompanying drawing structural principle of the present invention and operation principle are done detailed explanation.
With reference to Fig. 1, the present invention includes the condenser 8 that is connected with the exhaust outlet of steam turbine 6, low-pressure heater No5-No8, the high-pressure heater No1-No3 and the oxygen-eliminating device No4 that are connected with the bleeding point of steam turbine 6 dispose water supply control valve a between the high-pressure heater No1-No3 1-a 4And backwater control valve b 1-b 4, dispose water supply control valve a between the low-pressure heater No5-No8 5-a 9And backwater control valve b 5-b 9, arrange afterheat heat exchangers 4 before the first order air heat exchanger 5 of boiler 1, the arrival end A of afterheat heat exchanger 4 can with the water supply end A of low-pressure heater 2Or the water supply end A of high-pressure heater 1Be connected, the water side B of afterheat heat exchanger 4 can with the backwater end B of low-pressure heater 2Or the backwater end B of high-pressure heater 1Or b 1Be connected, the water side of afterheat heat exchanger 4 can connect condenser 8 by pipeline D ground connection ditch or by pipeline F.In addition, among the figure, the 2nd, economizer, the 3rd, second level air preheater, the 7th, generator, the 9th, condensate pump, the 10th, feed pump.
As shown in Figure 1: afterheat heat exchanger 4 is arranged in before the first order air preheater 5 in the flue of any position, if will specify high-pressure heater No3 outlet condensate water to supply water to afterheat heat exchanger 4, then can only open water supply control valve a 3, through A 1Point supplies water to afterheat heat exchanger 4 to the A point, therefore can select to control water supply control valve a 1To a 4Open or close and control each high-pressure heater and supply water to afterheat heat exchanger 4 to the A point through the A1 point.In like manner, also can select to control water supply control valve a 5To a 9Open or close and control each low-pressure heater through A 2Point supplies water to afterheat heat exchanger 4 to the A point.The condensate water at B point place can select to control backwater control valve b after afterheat heat exchanger 4 heating 1To b 4Or b 5To b 9Push And Release, by the B point through B 1Point enters each high-pressure heater or directly through control valve b 1Enter economizer, also can be by the B point through B 2Point enters each low-pressure heater or enters oxygen-eliminating device, thereby can save the part high-pressure heater or the low-pressure heater extracted steam from turbine amount of the above former heat-setting water of one-level, make it in steam turbine, to continue the work done generating, because afterheat heat exchanger has absorbed the heat of flue gas, make exhaust gas temperature be lower than original value, in fact that a part of waste heat of exhaust gas temperature reduction is used to generating so, if the electrical power of generating set is constant, then can save energy.
The boiler unit is when start and stop, and the going out saliva and can enter trench or condenser 8 of afterheat heat exchanger 4 is to clean and cooling residual heat heat exchanger 4 and connecting line.
With reference to Fig. 2, among this embodiment, high-pressure heater No1-No3 is by water supply control valve a 3, a 4Reach pipeline and be connected with the arrival end of afterheat heat exchanger 4, the water side of afterheat heat exchanger 4 is by backwater control valve b 1Be connected with the arrival end of economizer 2, thereby afterheat heat exchanger 4 has constituted with high-pressure heater No1-No3 and has connect structure in the lump.
With reference to Fig. 3, among this embodiment, low-pressure heater No5-No8 is by water supply control valve a 6, a 7Reach pipeline and be connected with the arrival end of afterheat heat exchanger 4, the water side of afterheat heat exchanger 4 is by backwater control valve b 5Be connected with the arrival end of oxygen-eliminating device No4, thereby afterheat heat exchanger 4 has constituted with low-pressure heater No5-No6 and has connect structure in the lump.
The present invention has following characteristics:
1, afterheat heat exchanger is arranged in before the air preheater, or before the economizer Rear suitable cigarette warm area. Because this place's cigarette temperature is more much higher than exhaust gas temperature, inhales It is much smaller to receive the required afterheat heat exchanger heating surface area of identical heat, corresponding cigarette resistance Also little with water resistance, this not only makes energy-conservation house of correction need the initial cost decrease, And solved existing boiler and arranged that in littler space afterheat heat exchanger is heated The problem of face, and boiler induced-draft fan and condensate pump also need not be changed;
2, afterheat heat exchanger can expand to high-pressure heater and form bootstrap system.This is because afterheat heat exchanger cigarette temperature of living in is higher, and the higher high-pressure heater condensate water of available water temperature supplies water to it, thereby what save is a part of high energy position extracted steam from turbine, can significantly improve energy-saving benefit;
3, solve the problem of high-sulfur combustor afterheat heat exchanger cold end corrosion that uses.If the flue gas dew point temperature of high-sulfur combustor is more than 125 ℃, to add supply water temperature low because of low, with low-pressure heater water supply the tube wall temperature of afterheat heat exchanger heating surface is lower than and uses high-sulfur combustor flue gas dew point temperature, thus the generation cold end corrosion.The high-pressure heater water temperature height that condenses supplies water to afterheat heat exchanger with the high-pressure heater condensate water, can avoid cold end corrosion;
Be used for cleaning and cooling off the pipeline of usefulness when 4, smoke discharging residual heat utilizes system to be furnished with start and stop.
When 5, adopting smoke discharging residual heat in parallel to utilize system, afterheat heat exchanger can supply water from an above high-pressure heater or low-pressure heater, i.e. the multichannel water system;
6, all to use native system energy-conservation as long as can substitute the various residual heat resources, solar energy, geothermal energy etc. of boiler exhaust gas waste heat;
7, afterheat heat exchanger can adopt formations such as light pipe, fin or extended surface tube, membrane type heating surface, solar thermal collector.
System of the present invention is simple, and is flexible to operation, reliable; Exhaust gas temperature is adjustable; Initial cost is low, about 2 years of pay off period; The gross coal consumption rate 2-4.2g/kw.h that can descend; The dry combustion method of afterheat heat exchanger ability, thereby smoke discharging residual heat utilizes system to be out of order, and can cut off it and supply water, and do not influence the normal operation of generating set; The fume side cold end corrosion can not take place in afterheat heat exchanger; The afterheat heat exchanger heating surface area is little, and system's fume side and water collateral resistance are less, helps adopting present technique to carry out reducing energy consumption to existing boiler unit.
The present invention is applicable to thermal power plant and the various UTILIZATION OF VESIDUAL HEAT IN that the enterprises such as iron and steel, metallurgy, oil and chemical industry with power plant for self-supply produce in process of production, also can be used for solar energy and geothermal energy.

Claims (6)

1, smoke discharging residual heat utilizes system in steam backheat power cycle, comprise the condenser (8) that is connected with steam turbine (6) exhaust outlet, the low-pressure heater (No5-No8), the oxygen-eliminating device (No4) that are connected with steam turbine (6) bleeding point, feature of the present invention is, this system comprises that also one is configured in the preceding afterheat heat exchanger (4) of air heat exchanger (5) of boiler (1), and afterheat heat exchanger (4) and low-pressure heater (No5-No8) are by water supply control valve (a 5-a 9), backwater control valve (b 5-b 9) and connecting pipe composition serial or parallel connection structure.
2, system according to claim 1 is characterized in that, the arrival end (A) of said afterheat heat exchanger (4) and the water supply end (A of low-pressure heater 2) be connected the water side (B) of afterheat heat exchanger (4) and the backwater end (B of low-pressure heater 2) be connected.
3, system according to claim 1 is characterized in that, the water side of said afterheat heat exchanger (4) is connected by pipeline (F) and condenser (8).
4, smoke discharging residual heat utilizes system in steam backheat power cycle, comprise the condenser (8) that is connected with steam turbine (6) exhaust outlet, the high-pressure heater (No1-No8), the oxygen-eliminating device (No4) that are connected with steam turbine (6) bleeding point, feature of the present invention is, this system comprises that also one is configured in the preceding afterheat heat exchanger (4) of air heat exchanger (5) of boiler (1), and afterheat heat exchanger (4) and high-pressure heater (No1-No3) are by water supply control valve (a 1-a 4), backwater control valve (b 1-b 4) and connecting pipe composition serial or parallel connection structure.
5, system according to claim 4 is characterized in that, the arrival end (A) of said afterheat heat exchanger (4) is connected with the water supply end (A1) of high-pressure heater, the water side (B) of afterheat heat exchanger (4) and the backwater end (B of high-pressure heater 1) be connected.
6, system according to claim 4 is characterized in that, the water side of said afterheat heat exchanger (4) is connected by pipeline (F) and condenser (8).
CN94119624A 1994-12-29 1994-12-29 Utilization system of exhausted smoke waste heat in steam heat-recovering dynamic circulation Expired - Fee Related CN1047435C (en)

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CN94119624A CN1047435C (en) 1994-12-29 1994-12-29 Utilization system of exhausted smoke waste heat in steam heat-recovering dynamic circulation

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Application Number Priority Date Filing Date Title
CN94119624A CN1047435C (en) 1994-12-29 1994-12-29 Utilization system of exhausted smoke waste heat in steam heat-recovering dynamic circulation

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CN1047435C true CN1047435C (en) 1999-12-15

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100408192C (en) * 2004-12-06 2008-08-06 西安交通大学 Residual-heat used type electric dust separator and its application system
CN102042581A (en) * 2011-01-21 2011-05-04 上海康洪精密机械有限公司 System for generating low-pressure steam by utilizing flue gas waste heat

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101696080B (en) * 2009-10-30 2012-07-25 蚌埠玻璃工业设计研究院 Smoke exhaust system of glass melting furnace
CN102454980B (en) * 2010-10-19 2014-07-16 上海成信建业节能科技有限公司 Method for recycling flue gas waste heat of thermal power plant boiler
CN102031999A (en) * 2010-11-23 2011-04-27 江苏丰泰冷却塔有限公司 Thermal power generator set with high-efficient circulating system
CN102537997B (en) * 2012-02-17 2014-10-01 燕守志 Isentropic air heat exchanger of boiler
CN103471084B (en) * 2013-09-11 2015-05-06 哈尔滨工业大学 Low-pressure hot-water smoke cooling system and method for avoiding low-temperature corrosion of air pre-heater
CN105972634B (en) * 2016-07-11 2018-06-26 西安交通大学 A kind of Steam Power Circulation heat power generating system and its technique

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100408192C (en) * 2004-12-06 2008-08-06 西安交通大学 Residual-heat used type electric dust separator and its application system
CN102042581A (en) * 2011-01-21 2011-05-04 上海康洪精密机械有限公司 System for generating low-pressure steam by utilizing flue gas waste heat

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