CN104006374B - Based on condensation water recovery system and the method for work of coagulation hydroenergy backwater heat exchanger - Google Patents
Based on condensation water recovery system and the method for work of coagulation hydroenergy backwater heat exchanger Download PDFInfo
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- CN104006374B CN104006374B CN201410270012.6A CN201410270012A CN104006374B CN 104006374 B CN104006374 B CN 104006374B CN 201410270012 A CN201410270012 A CN 201410270012A CN 104006374 B CN104006374 B CN 104006374B
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Abstract
The invention provides a kind of condensation water recovery system based on coagulation hydroenergy backwater heat exchanger and method of work, condensation water recovery system wherein comprises condenser, condensate pump, heat-exchanger rig, the back water pump connected successively and coagulation hydroenergy backwater heat exchanger, back water pump entrance point is connected with the heat-exchanger rig port of export, and coagulation hydroenergy backwater heat exchanger exit end is connected with the hot well on condenser.This recovery system comprises pure condensate operating mode and supplies thermal condition two kinds of mode of operations, for in thermal condition, lower the temperature after the condensate water that heat-exchanger rig exports flows through coagulation hydroenergy backwater heat exchanger, then enter hot well, heat up after the condensate water that hot well is collected flows through coagulation hydroenergy backwater heat exchanger again, finally enter boiler.The present invention still keeps the relatively stable of condensate pump inlet flow rate after can arranging in the frequency conversion cancelling condensate pump; decrease initial cost; improve job stability and the service life of condensate pump, also save energy resource consumption simultaneously, be conducive to energy-saving and emission-reduction and protection of the environment.
Description
Technical field
The present invention relates to distributed energy engineering and thermal power plant unit technical field, especially relate to a kind of condensation water recovery system based on coagulation hydroenergy backwater heat exchanger and method of work.
Background technology
For existing distributed energy engineering and thermal power plant unit, no matter be pure condensate operating mode or confession thermal condition, steam-condensation is all main condensing hot air furnace means.Under pure condensate operating mode, enter in hot well through the condensed condensed water of condenser, after being boosted by condensate pump, finally enter boiler.
But, under thermal condition, no matter draw gas to steam bromine cooling machine refrigeration or draw gas to user's heat exchanger condensation heat supply, all must carry out working medium recovery to the condensed water of heating steam.And at present for the recovery of the condensate return of this part extraction for heat supply steam, or be directly recovered to boiler by condensate-water polishing pipeline, or be directly wasted, and the temperature of condensate return is relatively high, therefore larger to the rate of water make-up of boiler, thus cause the huge waste of the energy and water resource, be unfavorable for energy-saving and emission-reduction; Meanwhile, also cause actual very low via the flow of condensate pump, therefore condensate pump needs arrange frequency converter, this adds investment undoubtedly.For distributed energy engineering, usual thermal power plant unit capacity is less, and heat supply large percentage takes out solidifying unit for this type of engineering, and often the amount of drawing gas is greater than the condensation number of condenser, and change is frequent.So just make the flow difference of condensate pump under pure condensate operating mode and confession thermal condition excessive, and Four seasons change is frequent round the clock, run under causing condensate pump to be in instability, severe operating mode always, cause lower the service life of condensate pump, and accident probability improves.
Summary of the invention
The technical problem to be solved in the present invention is: for prior art Problems existing, provides a kind of condensation water recovery system based on coagulation hydroenergy backwater heat exchanger and method of work, while minimizing investment, energy-saving and emission-reduction, improves the job stability of condensate pump.
The technical problem to be solved in the present invention realizes by the following technical solutions: a kind of condensation water recovery system based on coagulation hydroenergy backwater heat exchanger, comprise condenser, condensate pump, heat-exchanger rig, the back water pump connected successively and coagulation hydroenergy backwater heat exchanger, described back water pump entrance point is connected with the heat-exchanger rig port of export, described coagulation hydroenergy backwater heat exchanger exit end is connected with the hot well on condenser, and the condensate water in described hot well enters boiler after flowing through coagulation hydroenergy backwater heat exchanger.
Preferably, described heat-exchanger rig is steam bromine cooling machine or user's heat exchanger.
Preferably, described condensation water recovery system also comprises storage tank, and described storage tank is connected on the pipeline between described heat-exchanger rig and back water pump.
Preferably, described condensation water recovery system also comprises pressure regulator valve, and described pressure regulator valve is connected on the pipeline between the hot well on coagulation hydroenergy backwater heat exchanger and condenser.
The method of work of the above-mentioned condensation water recovery system based on coagulation hydroenergy backwater heat exchanger, comprise pure condensate operating mode and supply thermal condition two kinds of mode of operations, supplying in thermal condition, first draw gas to heat-exchanger rig, lower the temperature after the condensate water of heat-exchanger rig output flows through coagulation hydroenergy backwater heat exchanger, condensate water after cooling enters hot well, and the condensate water that hot well is collected flows through coagulation hydroenergy backwater heat exchanger by condensate pump pumping, and the condensate water after heating up finally enters boiler.
Preferably, to export and the coagulation hydroenergy backwater pressure entering hot well is 0.05Mpa-0.15Mpa from described coagulation hydroenergy backwater heat exchanger.
Preferably, the temperature after the condensate water that described heat-exchanger rig exports flows through coagulation hydroenergy backwater heat exchanger is less than 60 DEG C.
Compared with prior art, the invention has the beneficial effects as follows: by arranging shared coagulation hydroenergy backwater heat exchanger on heating steam water return pipeline and main condensate pipeline, both the coagulation hydroenergy backwater waste heat in recyclable heating steam water return pipeline, to meet the return water temperature requirement entering condenser, condensed water is made directly to return the hot well of condenser; Coagulation hydroenergy backwater waste heat can be utilized again to carry out preheating to the feedwater being delivered to boiler from condenser hotwell, to improve the feed temperature of boiler simultaneously.Therefore, still keep the relatively stable of condensate pump inlet flow rate under the condition utilizing the present invention can arrange in the frequency conversion cancelling condensate pump, thus decrease initial cost, also improve job stability and the service life of condensate pump; Meanwhile, the recycling of coagulation hydroenergy backwater waste heat is also conducive to the energy resource consumption of saving boiler, thus reaches the object of energy-saving and emission-reduction, protection of the environment.Condensation water recovery system of the present invention achieves the omnidistance closed cycle of system, and the working medium rate of recovery is high, and system water supplement amount is extremely low.
Accompanying drawing explanation
Fig. 1 is the structural map of a kind of condensation water recovery system based on coagulation hydroenergy backwater heat exchanger of the present invention.
Mark in figure: 1-steam turbine, 2-generator, 3-condenser, 4-hot well, 5-condensate pump, 6-coagulation hydroenergy backwater heat exchanger, 7-back water pump, 8-storage tank, 9-heat-exchanger rig, 10-boiler, 11-pressure regulator valve.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with the drawings and specific embodiments, the present invention is described in detail.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
For distributed energy engineering or thermal power plant unit, if adopt condensing turbine, the steam produced by boiler is through Steam Turbine Driven generator acting generating or all need to reclaim condensate water working medium after extraction for heat supply.A kind of condensation water recovery system based on coagulation hydroenergy backwater heat exchanger as shown in Figure 1, mainly comprise condenser 3, condensate pump 5, coagulation hydroenergy backwater heat exchanger 6 and back water pump 7 and heat-exchanger rig 9, the entrance point of described condenser 3, heat-exchanger rig 9 is all connected with steam turbine 1 and communicates, and the hot well 4 on described condenser 3, condensate pump 5, coagulation hydroenergy backwater heat exchanger 6 and boiler 10 connect to form condensate water major loop successively.Hot well 4 on the port of export of described heat-exchanger rig 9 and storage tank 8, back water pump 7, coagulation hydroenergy backwater heat exchanger 6 and pressure regulator valve 11 and condenser 3 connects to form heat supplying loop successively.In order to improve the functional reliability of this condensation water recovery system, described condensate pump 5 is provided with two, and for being connected in parallel, commonly use for one, one for subsequent use.
In above-mentioned condensation water recovery system, heat-exchanger rig 9 wherein can adopt steam bromine cooling machine, also can be user's heat exchanger, can be freezed by steam bromine cooling machine, can be user's heat supply by user's heat exchanger, thus the steam drawn gas to heat-exchanger rig 9 is made full use of, be conducive to energy-saving and emission-reduction.Storage tank 8 is wherein connected on the pipeline between heat-exchanger rig 9 and back water pump 7, for reclaiming, collecting the condensate water or secondary vapour of discharging from heat-exchanger rig 9, ensures the output flow of back water pump 7; Described heat-exchanger rig 9 is connected with storage tank 8 top inlet end and communicates, and back water pump 7 is connected with storage tank 8 outlet at bottom end and communicates, and is conducive to from heat-exchanger rig 9 condensed water in high temperature out or the cooling of secondary vapour like this, improves the rate of recovery of condensate water.Coagulation hydroenergy backwater pump 7 wherein have employed hot water booster, for being pumped to coagulation hydroenergy backwater heat exchanger 6 by after the condensate water boosting in storage tank 8, and finally enters condenser 3.Because the condensing water temperature in storage tank 8 is relatively high, hot water booster is adopted to be conducive to, under design allows operating mode, avoiding back water pump 7 that cavitation occurs as far as possible, thus ensureing the job stability of this condensation water recovery system, and extend the service life of back water pump 7.
If heat-exchanger rig 9 adopts steam bromine cooling machine, because steam bromine cooling machine is arranged in distributed busbar protection usually, close together, and also steam is after steam bromine cooling machine acting condensation, and temperature is also higher, and likely produces secondary vapour.In order to reduce loss of steam and water, improve condensate recovery percentage, storage tank 8 does not adopt air suspended type return water tank substantially, and selects the coagulation hydroenergy backwater case of band cavitation cancellation element, to eliminate the adverse effect of cavitation to equipment such as storage tank 8 and back water pumps 7.But, if heat-exchanger rig 9 adopts common user's heat exchanger, usually because user uses a little far away, heat utilization efficiency is high, therefore the coagulation hydroenergy backwater that user's heat exchanger exports is not generally containing secondary vapour, temperature is also on the low side, therefore, the condensate collection tank of normal pressure heat-insulating selected by storage tank 8, without particular/special requirement.The condensate water that heat-exchanger rig 9 can be made like this to discharge and secondary vapour are recycled fully; loss of steam and water about 20% ~ 25% can be reduced; also can alleviate thermal pollution and noise pollution that whole condensation water recovery system causes simultaneously, be conducive to energy-saving and emission-reduction and environmental protection.
The method of work of the above-mentioned condensation water recovery system based on coagulation hydroenergy backwater heat exchanger is as follows: be mainly divided into pure condensate operating mode and supply thermal condition two kinds of mode of operations, under pure condensate operating mode, the steam produced by boiler 10 through steam turbine 1 drive generator 2 do work generating after, be condensed into condensate water by condenser 3 and enter in hot well 4, the condensate water in hot well 4 is boosted via condensate pump 5 again, returning boiler 10 after coagulation hydroenergy backwater heat exchanger 6 heat exchange.Supplying under thermal condition, the steam produced by boiler 10 is drawn gas out by from steam turbine 1 body, condensate water is condensed into after heat-exchanger rig 9 heat exchange, be recycled to unified storage tank 8 again, necessarily boost finally by back water pump 7, be back to coagulation hydroenergy backwater heat exchanger 6, in coagulation hydroenergy backwater heat exchanger 6, heat exchange is carried out from the main condensate in the coagulation hydroenergy backwater of back water pump 7 and condensate water major loop, coagulation hydroenergy backwater after coagulation hydroenergy backwater heat exchanger 6 heat exchange cooling is by after pressure regulator valve 11 Decompression Controlling, finally enter in the hot well 4 on condenser 3, the condensate water that hot well 4 is collected is boosted via condensate pump 5 again, coagulation hydroenergy backwater heat exchanger 6 heat exchange returns boiler 10 after heating up.Pressure regulator valve 11 is wherein connected on the pipeline between coagulation hydroenergy backwater heat exchanger 6 and hot well 4, is mainly used in the coagulation hydroenergy backwater flow reducing pressure and control to enter condenser 3.
In order to avoid destroying the vacuum of condenser 3, the heat supply backwater from coagulation hydroenergy backwater heat exchanger 6 is enable successfully to enter in condenser 3, the heat supply backwater that can be exported by the pressure regulator valve 11 pairs of coagulation hydroenergy backwater heat exchangers 6 be reduced pressure, and preferably makes to export and between the coagulation hydroenergy backwater pressure entering hot well 4 to 0.05Mpa-0.15Mpa from coagulation hydroenergy backwater heat exchanger 6.In addition, described coagulation hydroenergy backwater heat exchanger 6 is the nucleus equipments in this condensation water recovery system, and in order to reclaim the heat of the condensate water that heat-exchanger rig 9 is discharged to greatest extent, coagulation hydroenergy backwater heat exchanger 6 preferably adopts shell-and-tube water water-to-water heat exchanger.It needs to be noted, the heat exchange area of coagulation hydroenergy backwater heat exchanger 6 should meet the condensate return temperature that its port of export exports and be less than 60 DEG C, to meet condenser 3 to the coagulation hydroenergy backwater temperature requirement entered wherein, in order to avoid destroy the vacuum in condenser 3, ensure that the coagulation hydroenergy backwater after heat supply successfully enters condenser 3.
The present invention by arranging shared coagulation hydroenergy backwater heat exchanger 6 on heating steam water return pipeline and main condensate pipeline, not only farthest can reclaim the coagulation hydroenergy backwater waste heat in heating steam water return pipeline and condensate return, coagulation hydroenergy backwater waste heat can be utilized again to carry out preheating to the feedwater being delivered to boiler 10 from the hot well 4 on condenser 3, thus meet the temperature requirement of the coagulation hydroenergy backwater entering condenser 3, turn improve the feed temperature of boiler 10 simultaneously, be conducive to the hear rate and the power supply gas consumption that reduce thermal power plant unit, realize energy-saving and emission-reduction.In addition, the present invention also makes no matter to be pure condensate operating mode, or for thermal condition, the flow via condensate pump 5 keeps relative stability, and therefore, can cancel the converter plant on traditional condensate pump 5 completely, and its design discharge is considered according to pure condensate operating mode.So just can reduce the initial cost of whole system.When the heat supply of distributed energy engineering and pure condensate operating mode frequently switch, even if the amount of drawing gas of thermal power plant unit frequently adjusts, owing to substantially remaining unchanged through the flow of condensate pump 5, the wearing and tearing of condensate pump 5 can be reduced like this, improve job stability and the service life of condensate pump 5.Condensation water recovery system of the present invention is omnidistance closed cycle, and the working medium rate of recovery is high.Through measuring and calculating, under thermal condition, according to user and the distance of refrigeration plant and the tightness of heating system entirety, a complete set of system only needs the system water supplement amount of consideration 2% ~ 5%.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, it should be pointed out that all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. the condensation water recovery system based on coagulation hydroenergy backwater heat exchanger, comprise condenser (3), condensate pump (5) and heat-exchanger rig (9), it is characterized in that: also comprise the back water pump (7) and coagulation hydroenergy backwater heat exchanger (6) that connect successively, described back water pump (7) entrance point is connected with heat-exchanger rig (9) port of export, the entrance point of described heat-exchanger rig (9) is connected with steam turbine (1) and communicates, described coagulation hydroenergy backwater heat exchanger (6) port of export is connected with the hot well (4) on condenser (3), condensate water in described hot well (4) enters boiler (10) after flowing through coagulation hydroenergy backwater heat exchanger (6).
2. the condensation water recovery system based on coagulation hydroenergy backwater heat exchanger according to claim 1, is characterized in that: described heat-exchanger rig (9) is steam bromine cooling machine or user's heat exchanger.
3. the condensation water recovery system based on coagulation hydroenergy backwater heat exchanger according to claims 1 or 2, it is characterized in that: also comprise storage tank (8), described storage tank (8) is connected on the pipeline between described heat-exchanger rig (9) and back water pump (7).
4. the condensation water recovery system based on coagulation hydroenergy backwater heat exchanger according to claims 1 or 2, it is characterized in that: also comprise pressure regulator valve (11), described pressure regulator valve (11) is connected on the pipeline between the hot well (4) on coagulation hydroenergy backwater heat exchanger (6) and condenser (3).
5. as claimed in claim 1 based on the method for work of the condensation water recovery system of coagulation hydroenergy backwater heat exchanger, it is characterized in that: comprise pure condensate operating mode and supply thermal condition two kinds of mode of operations, supplying in thermal condition, first draw gas to heat-exchanger rig (9), the condensate water exported from heat-exchanger rig (9) flows through coagulation hydroenergy backwater heat exchanger (6) and lowers the temperature afterwards, condensate water after cooling enters hot well (4), hot well (4) condensate water of collecting is by condensate pump (5) pumping and flow through coagulation hydroenergy backwater heat exchanger (6), condensate water after heating up finally enters boiler (10).
6. the method for work of the condensation water recovery system based on coagulation hydroenergy backwater heat exchanger according to claim 5, is characterized in that: to export and the coagulation hydroenergy backwater pressure entering hot well (4) is 0.05Mpa-0.15Mpa from described coagulation hydroenergy backwater heat exchanger (6).
7. the method for work of the condensation water recovery system based on coagulation hydroenergy backwater heat exchanger according to claim 5 or 6, is characterized in that: the temperature after the condensate water that described heat-exchanger rig (9) exports flows through coagulation hydroenergy backwater heat exchanger (6) is less than 60 DEG C.
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| CN108692351A (en) * | 2018-06-22 | 2018-10-23 | 华电国际电力股份有限公司技术服务中心 | High back pressure circulating water heating and pumping coagulate thermal power plant unit combined optimization system and method |
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| DE102008047283A1 (en) * | 2008-09-16 | 2010-04-15 | Thermea. Energiesysteme Gmbh | Steam generation plant for the regeneration of activated carbon filter of industrial exhaust air cleaning units that are used in gravure print shops for cleaning exhaust air of toluene, comprises a steam storage, and a cooling tower |
| CN102562200A (en) * | 2011-12-28 | 2012-07-11 | 中国华冶科工集团有限公司 | Low-pressure residual heat steam power generation system |
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Address after: 610021 Dongfeng Road, Chengdu, Sichuan, No. 18, No. Applicant after: China Power Engineering Consulting Group Southwest Electric Power Design Institute Co., Ltd. Address before: 610021 Dongfeng Road, Chengdu, Sichuan, No. 18, No. Applicant before: Southwest Electric Power Design Institute of China Power Engineering Consulting Group Corporation |
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