CN104696938B - Mechanical heating power compound type steamed vapour pressure compression system based on wastewater utilization - Google Patents
Mechanical heating power compound type steamed vapour pressure compression system based on wastewater utilization Download PDFInfo
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Abstract
The present invention provides a kind of mechanical heating power compound type steamed vapour pressure compression system based on wastewater utilization, middle pressure condensation waste water flash distillation is low pressure flash steam by its low pressure flash chamber, High Temperature High Pressure brine waste is carried out shwoot by hp flash drum, produce high pressure flash steam, centrifugal compressor receives low pressure flash steam, and adiabatic compression is together carried out with other low-pressure steam, generation is pressed saturated vapor, unnecessary low-pressure steam beyond this centrifugal compressor metered flow is heated by steam reheater, nozzle-adjustable steam jet pump using high pressure flash steam as power steam with injection heat after unnecessary low-pressure steam, generation is pressed saturated vapor.It is somebody's turn to do mechanical heating power compound type steamed vapour pressure compression system based on wastewater utilization and not only achieves the optimization cascade utilization of different grade used heat, and preferable for customer charge variation adaptability.
Description
Technical field
The present invention relates to thermal technology field, especially relate to a kind of based on low-pressure steam and middle pressure condensed water and the mechanical heating power compound type steamed vapour pressure compression system of High Temperature High Pressure brine waste comprehensive utilization.
Background technology
At present a lot of industry such as oil extraction, oil-refining chemical, textile printing and dyeing, bio-pharmaceuticals, food processing and thermoelectric heatings etc. are required for the steam of a large amount of different grade, with satisfied heating, distill, be dried and the process requirements such as concentration.And these steam user can produce substantial amounts of low parameter steam and High Temperature High Pressure condenses water simultaneously, the condensed water produced after the steam produced after the low pressure exhaust steam of discharge after such as turbine expansion acting, vacuum flash or the low-pressure steam of expenditure and pressure generation, concentrated solution heating and high steam heat exchange, this part waste vapour and waste water are rich in substantial amounts of heat resource, if be directly discharged in air or in ground and body of groundwater, not only cause heat energy and water resource waste, even can produce serious environmental pollution.The most only raw coal of Industrial Boiler just consumption about 500,000,000 tons every year is used for producing steam, wherein steam latent heat and the waste water sensible heat of 1/5 is directly discharged without utilization, it is therefore desirable to these residual heat resources are reclaimed, to improving capacity usage ratio, reduce energy resource consumption and environmental pollution, and bring good social and economic benefits.
Low pressure exhaust steam directly utilizes and is typically difficult to find that the low-grade heat user matched, and cannot meet again high-grade heat user commercial production duty requirements.And if high-temperature high-pressure waste water is directly used in heating, it is its sensible heat due to utilize, not only invest height, occupation of land is big, energy consumption is many, and heat transfer effect is unsatisfactory for the steam containing air, and cause the waste of great capacity for work, thermodynamically do not meet Energy harvesting maximization principle.Compression method based on heat pump principle is a kind of effective steam energy grade upgrade method.As a example by mechanical compression heat pump, this equipment consumes mechanical or electrical energy by the form of compression, and transfers energy to low-pressure steam thus produce high temperature and high pressure steam, is substantially to put into fraction high-lying well to promote low-pressure steam grade, thus supply is pressed heat user, in order to use its latent heat.The amount of heat and the industrial waste heat that cannot directly utilize that belong to low temperature range can be changed into useful energy by it, and it is supplied to indoor heating or some technical process, but due to the consuming of mechanical compression type heat pump is high-grade mechanical energy, fails to make full use of the acting ability of high-temperature high-pressure waste water.Therefore must consider that one can realize low-pressure steam supercharging and heat up, can effectively utilize again high-grade waste water heat energy, reduce the both vapor compression step energy scheme of power consumption.We have invented a kind of new based on wastewater utilization mechanical heating power compound type steamed vapour pressure compression system for this, solve above technical problem.
Summary of the invention
It is an object of the invention to provide a kind of based on low-pressure steam recovery and middle pressure condensed water and the mechanical heating power compound type steamed vapour pressure compression system of High Temperature High Pressure brine waste cascade utilization technology, final realize on the basis of mesohigh waste water heat energy makes full use of low-pressure steam efficiently, low power consumption, low cost reclaim upgrading, and return heat user and be circulated utilization.
nullThe above-mentioned purpose of the present invention can be achieved by the following technical measures: mechanical heating power compound type steamed vapour pressure compression system based on wastewater utilization，This system includes low pressure flash chamber、Hp flash drum、Nozzle-adjustable steam jet pump、Centrifugal compressor and steam reheater，During this low pressure flash chamber receives, pressure condenses waste water，And by middle pressure condensation waste water flash distillation be low pressure flash steam，This hp flash drum receives High Temperature High Pressure brine waste，And High Temperature High Pressure brine waste is carried out shwoot，Produce high pressure flash steam，This centrifugal compressor is connected to low pressure flash chamber，Receive low pressure flash steam，And adiabatic compression is together carried out with other low-pressure steam，Generation is pressed saturated vapor，This steam reheater is connected to the exit of this centrifugal compressor，And the unnecessary low-pressure steam beyond this centrifugal compressor metered flow is heated，The injection end of this nozzle-adjustable steam jet pump is connected to this steam reheater to receive the unnecessary low-pressure steam after heating，The arrival end of this nozzle-adjustable steam jet pump is connected to this hp flash drum，To receive high pressure flash steam，This nozzle-adjustable steam jet pump using high pressure flash steam as power steam with injection heat after unnecessary low-pressure steam，Generation is pressed saturated vapor.
The above-mentioned purpose of the present invention realizes also by following technical measures:
The present invention not only achieves the optimization cascade utilization of different grade used heat, and it is preferable for customer charge variation adaptability, owing to compressor is in declared working condition, remain efficient operation state, save the unnecessary power consumption that off rating operating is caused, utilize High Temperature High Pressure residual heat resources to be compressed simultaneously, save the consumption of high-grade electric energy, the interior energy of latent heat and high pressure waste water owing to taking full advantage of low-pressure steam, drastically increase heat utilization rate, decrease the overall heat consumption of process system, reduce energy consumption cost.Present invention can be widely used to steam heating, compression and related industrial fields.
Accompanying drawing explanation
Fig. 1 is the structure chart that the one of based on wastewater utilization the mechanical heating power compound type steamed vapour pressure compression system of the present invention is embodied as case.
Detailed description of the invention
For making the above and other objects, features and advantages of the present invention to become apparent, cited below particularly go out preferable case study on implementation 1, and coordinate institute's accompanying drawings, be described in detail below.
As it is shown in figure 1, the structure chart of based on wastewater utilization the mechanical heating power compound type steamed vapour pressure compression system that Fig. 1 is the present invention.Should be made up of low pressure flash chamber 1, hp flash drum 2, nozzle-adjustable steam jet pump 3, centrifugal compressor 4, steam reheater 5 and low pressure flash chamber heater 6 and condensate pump 7 by mechanical heating power compound type steamed vapour pressure compression system based on wastewater utilization.
Low pressure flash chamber 1 presses the middle pressure condensation waste water that heat user produces in receiving, and is low pressure flash steam by middle pressure condensation waste water flash distillation, it is ensured that produced low pressure flash steam is identical with low pressure exhaust steam pressure, in order to subsequent recovery utilizes.In order to press the flash distillation rate of condensed water in increasing, installing low pressure flash chamber heater 6 in flash tank with the more latent heat of offer for shwoot, after flash distillation, remaining low pressure condensed water is then as the desuperheating water water source of boiler feedwater water source, centrifugal compressor 4 and nozzle-adjustable steam jet pump 3.Particularly, condensate pump 7 is connected to low pressure flash chamber 1, and three strands will be divided into after the boosting of remaining low pressure condensed water after flash distillation, wherein one sends into boiler as boiler feedwater, one inlet nozzle being passed through centrifugal compressor 4 carries out humidification in advance and ensures that outlet is for saturated vapor steam, another strand is then connected to the port of export of nozzle-adjustable steam jet pump 3, carries out humidifying desuperheat to the superheated steam after compression so that it is reach saturation.
Hp flash drum 2 receives the High Temperature High Pressure brine waste come by steam generator system, and High Temperature High Pressure brine waste is carried out shwoot, by the form pressure and temperature reducing of spray atomizing, the high pressure flash steam produced then makees the power steam of nozzle-adjustable steam jet pump 3 for injection low-pressure steam, low-pressure steam namely carries out volume and inhales and compression.Condensed water after High Temperature High Pressure brine waste flash distillation is divided into two strands, wherein one is passed through low-pressure steam reheater 5 in order to add hot rolling suction steam to improve the mass ratio of induced-to-inducing air of steam jet pump, another strand is passed through low pressure flash chamber heater 6 and adds heat low as thermal source and coagulate water thus the evaporation rate that increases low pressure flash pot liquid, and the flash distillation after low-pressure steam reheater 5 heat exchange is coagulated water and is re-introduced into saline sewage recovery system so that desalination recycling.
Centrifugal compressor 4 is connected to low pressure flash chamber 1, receives the low pressure flash steam of low pressure flash chamber 1 flash distillation, and together carries out adiabatic compression with other low-pressure steam, presses saturated vapor in generation.Owing to being superheated steam after dry saturated steam adiabatic compression, it is unfavorable for heat exchange.Affect follow-up flow process to use to prevent outlet vapor overheated, atomizer is installed in centrifugal compressor 4 porch and sprays into saturation water, increase in advance the humidity of inlet steam, make steam reach saturated reducing superheat steam temperature, it is ensured that compressor runs under declared working condition.Particularly, the inlet nozzle of centrifugal compressor 4 is sprayed into by condensate pump 7 after being boosted by condensed water after low pressure flash, dry saturated vapor is become wet saturated steam, then transferring energy to the low-pressure steam after humidification by the way of centrifugal compressor 4 adiabatic compression, final outlet is middle pressure saturated vapor.Whole compression process i.e. ensure that compression terminal is saturated vapor, compression process can be made again to maintain a relatively low temperature levels to be unlikely to because of overheated all the time and cause temperature rising excessive and damaged blade.
Nozzle-adjustable steam jet pump 3 is coupled to centrifugal compressor 4 by injection end, receives the unnecessary low-pressure steam exceeding centrifugal compressor 4 metered flow, and low-pressure steam is carried out thermal compression.In one embodiment, for being then incorporated into nozzle-adjustable steam jet pump 3 injection end beyond the low-pressure steam more than needed of centrifugal compressor 4 metered flow, first by the steam reheater 5 being connected to centrifugal compressor 4 exit, it being carried out heating makes low-pressure steam overheated, to reduce steam specific volume, improve steam enthalpy, improve ejector pump mass ratio of induced-to-inducing air, and then reduce the high pressure flash steam consumption that compression unit low-pressure steam is consumed.The arrival end of nozzle-adjustable steam jet pump 3 is connected to hp flash drum 2, to receive high pressure flash steam, and the Rafael nozzle within passing through makes steam flow rate improve, pressure drop reduces and is less than by the low-pressure steam pressure of injection, thus produces certain suction force.Low-pressure superheated steam after reheating is imported from the volume suction inlet of nozzle-adjustable steam jet pump 3, low-pressure steam be aspirated into nozzle-adjustable steam jet pump 3 after after mixing chamber is mixed homogeneously with main steam again the diffuser pipe in nozzle-adjustable steam jet pump 3 boost the middle pressure reached required for heat user.
In one embodiment, for nozzle-adjustable steam jet pump 3, steam after compressing due to injection is superheated steam, heating should not be directly used in, therefore the low pressure condensed water after installing nozzle on nozzle-adjustable steam jet pump 3 outlet conduit and being introduced directly into boosting carries out spray desuperheating to this strand of superheated steam, condensed water absorbs the sensible heat of superheated steam, and itself is gasified, it is achieved condensate water circulatory recycles.And superheated steam is due to release sensible heat the saturated vapor becoming under same equal pressure of lowering the temperature, it is simple to subsequent thermal user makes full use of its latent heat of use, improves overall thermal utilization rate.Pressure saturated vapor middle produced by centrifugal compressor 4 and nozzle-adjustable steam jet pump 3 is collected and can send into middle pressure steam heat user afterwards for use.
Mechanical heating power compound type steamed vapour pressure compression system based on wastewater utilization, the technical processs such as height, middle pressure waste water flash distillation, the compression of low-pressure steam machinery, saturated vapor reheating, steam jet pump thermal compression, saturated vapor humidification, superheated steam temperature reduction and compressed steam recycle should be included by mechanical heating power compound type steamed vapour pressure compression system based on wastewater utilization, mainly should be humidified the thermodynamic processes such as desuperheat by pressure build up to reclaim low pressure exhaust steam latent heat and middle high-pressure waste water heat energy by mechanical heating power compound type steamed vapour pressure compression system based on wastewater utilization.
It is illustrated below for some special operation conditions:
(1) without high pressure waste water operating mode: when scene middle pressure condensed water and low pressure waste water, whole low-pressure steams introduce centrifugal compressor 4 with cycling and reutilization of upgrading；
(2) without low pressure waste vapour operating mode: when scene does not has low pressure waste vapour, after high-temperature high-pressure waste water is flashed to user's matching pressure, flash-off steam bypasses supply heat user by nozzle-adjustable steam jet pump 3；
(3) high pressure waste water affluence operating mode: when there is a large amount of high-temperature high-pressure waste water having more than needed at scene, compression duty can be completed by nozzle-adjustable steam jet pump 3 completely, and the most all low-pressure steams are all passed through nozzle-adjustable steam jet pump 3 injection end and carry out thermal compression；
(4) low-pressure steam affluence operating mode: now low-pressure steam is divided into two strands, compression duty is mainly completed by centrifugal compressor 4, nozzle-adjustable steam jet pump 3 is as auxiliary compression system, complete the compression duty of another part steam, i.e. centrifugal compressor 4 and nozzle-adjustable steam jet pump 3 parallel running mode as power by high pressure flash steam；
(5) operating mode is changed with steam pressure: when heat user steam pressure demand fluctuation changes greatly, if steam is compressed by the pressure limit beyond centrifugal compressor 4, not only outlet parameter is the most up to standard, and can increase unit both vapor compression energy consumption.Now should first ensure that centrifugal compressor 4 runs under specified operating mode, and centrifugal compressor 4 outlet vapor is introduced directly into the injection entrance of nozzle-adjustable steam jet pump 3, change the nozzle structural parameters of nozzle-adjustable steam jet pump 3 in order to mate compressor outlet steam pressure, follow-up compression work is completed by nozzle-adjustable steam jet pump 3, thus it is minimum to ensure that low-pressure steam reaches system recovery energy consumption during specified pressure, this is centrifugal compressor 4 and nozzle-adjustable steam jet pump 3 series operation mode；
(6) different pressures uses vapour operating mode simultaneously: when existence two kinds and two or more steam pressure demand, two or multiple stage ejector pump device can be used, adjust bypass, in parallel and cascaded structure according to demand, and ensure that whole steam compression system immanent structure is reasonable, be automatically adjusted perfect, the mutual Optimized Matching of device, make high pressure flash vapour reclaim vapour more than more low pressure as much as possible, thus reach the global optimization of compressibility, energy-conservation maximization, steam supply rationalization, process steam optimization.
Finally it is pointed out that above example is only the more representational example of the present invention.Obviously, technical scheme is not limited to above-described embodiment 1, it is also possible to have many deformation.All deformation that those of ordinary skill in the art can directly derive from present disclosure or associate, are all considered as protection scope of the present invention.
In a specific embodiment of the application present invention, certain associating yard has a sewage disposal system.This system has a vaporizer, to need flow during actual motion be 5t/h, pressure be the dry saturated steam of 0.15MPa as technique thermal source, this system can produce the dry saturated steam that pressure is 0.1MPa simultaneously.This system has a pressure ratio 1.5, the centrifugal vapor compressor for the treatment of capacity 5t/h, declared working condition power consumption 185kW.Have a high mass dryness fraction steam-water separator near device context, be 14.2Mpa by 23t/h pressure under declared working condition, mass dryness fraction be 0.75 moist steam separation water outlet after produce the separating at high temperature waste water of 12t/h.Design UTILIZATION OF VESIDUAL HEAT IN technique according to existence conditions, and calculate amount of electricity saving.
In order to solve the problems referred to above, it is first according to Fig. 1 and determines waste heat recovery and both vapor compression technique.Next determines the optimal flashing pressure of high pressure waste water.In view of High Temperature High Pressure flash steam as the power steam of ejector pump, its utilization rate is the highest, and amount of electricity saving is the most obvious.It is: working steam pressure is undetermined that it is 0.1MPa dry saturated steam that volume inhales steam, exports as 0.15Mpa superheated steam, it is contemplated that flashing pressure is the biggest, and flash distillation rate is the lowest, and power steam amount is the fewest for its main working parameters of ejector pump.Meanwhile, flashing pressure is the biggest, and mass ratio of induced-to-inducing air is the biggest.Table 1 illustrates flash distillation rate and the mass ratio of induced-to-inducing air of water under high pressure flash steam of the high pressure waste water under different flashing pressure, thus can determine that optimal flashing pressure is 2MPa.
Ton water jet coefficient calculations result under the different flashing pressure of table 1
| Flashing pressure/MPa | 0.2 | 0.6 | 1.0 | 2.0 | 4.0 | 6.0 | 8.0 |
| Flash distillation rate | 0.49 | 0.44 | 0.41 | 0.36 | 0.29 | 0.23 | 0.18 |
| Mass ratio of induced-to-inducing air | 0.20 | 0.94 | 1.18 | 1.40 | 1.41 | 1.25 | 0.97 |
| Comprehensive mass ratio of induced-to-inducing air | 0.098 | 0.414 | 0.484 | 0.504 | 0.409 | 0.359 | 0.175 |
If using merely centrifugal compressor to be compressed, then compression ton steam consumption electricity is Wm=185/5=35 kWh；
Reclaiming high-temperature high-pressure waste water compressed steam amount is: 23* (1-0.75) * 0.504=3.025 t/h
Then high-temperature high-pressure waste water amount of electricity saving is: 3.025*35=105.875 kWh
I.e. use high-temperature high-pressure waste water to carry out low-pressure steam compression and can save the electricity of 105.875 kWh.
Claims (4)
- null1. mechanical heating power compound type steamed vapour pressure compression system based on wastewater utilization，It is characterized in that，This system includes low pressure flash chamber、Hp flash drum、Nozzle-adjustable steam jet pump、Centrifugal compressor and steam reheater，During this low pressure flash chamber receives, pressure condenses waste water，And by middle pressure condensation waste water flash distillation be low pressure flash steam，This hp flash drum receives High Temperature High Pressure brine waste，And High Temperature High Pressure brine waste is carried out flash distillation，Produce high pressure flash steam，This centrifugal compressor is connected to low pressure flash chamber，Receive low pressure flash steam，And adiabatic compression is together carried out with other low-pressure steam，Generation is pressed saturated vapor，This steam reheater is connected to the exit of this centrifugal compressor，And the unnecessary low-pressure steam beyond this centrifugal compressor metered flow is heated，The injection end of this nozzle-adjustable steam jet pump is connected to this steam reheater to receive the unnecessary low-pressure steam after heating，The arrival end of this nozzle-adjustable steam jet pump is connected to this hp flash drum，To receive high pressure flash steam，This nozzle-adjustable steam jet pump using high pressure flash steam as power steam with injection heat after unnecessary low-pressure steam，Generation is pressed saturated vapor.
- Mechanical heating power compound type steamed vapour pressure compression system based on wastewater utilization the most according to claim 1, it is characterized in that, this system also includes condensate pump, this condensate pump is connected to this low pressure flash chamber, and three strands will be divided into after the boosting of remaining low pressure condensed water after flash distillation, wherein one sends into boiler as boiler feedwater, one be passed through the inlet nozzle of this centrifugal compressor low pressure flash steam carries out humidification to ensure to export is saturated vapor, another strand is then connected to the port of export of this nozzle-adjustable steam jet pump, carry out humidifying desuperheat, the unnecessary low-pressure steam after injection is made to reach saturation, generation is pressed saturated vapor.
- Mechanical heating power compound type steamed vapour pressure compression system based on wastewater utilization the most according to claim 1, it is characterized in that, this system also includes low pressure flash chamber heater, and this low pressure flash chamber heater is arranged in this low pressure flash chamber, to provide more latent heat for flash distillation.
- Mechanical heating power compound type steamed vapour pressure compression system based on wastewater utilization the most according to claim 3, it is characterized in that, the high pressure condensed water after High Temperature High Pressure brine waste flash distillation in this hp flash drum is divided into two strands, wherein one be passed through this low-pressure steam reheater in order to heat the unnecessary low-pressure steam beyond this centrifugal compressor metered flow with improve steam jet pump mass ratio of induced-to-inducing air, another strand be passed through this low pressure flash chamber heater as thermal source heating low pressure condensed water thus increase the evaporation rate of this low pressure flash pot liquid.
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| CN105423266B (en) * | 2015-12-25 | 2018-06-26 | 中石化节能环保工程科技有限公司 | A kind of high/low temperature sewage remaining energy cascade utilization and recycling reclaiming system and its method |
| CN106247315A (en) * | 2016-08-03 | 2016-12-21 | 东华工程科技股份有限公司 | A kind of steam condensate recycling device |
| CN108954280B (en) * | 2018-06-11 | 2019-07-23 | 西安交通大学 | A kind of high temperature and high pressure steam occurs and cyclic utilization system |
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| CN114623429B (en) * | 2022-03-22 | 2023-06-16 | 东方电气集团东方电机有限公司 | Micropressure steam recovery system and method |
| CN115823562B (en) * | 2023-02-14 | 2023-05-12 | 苏州晟德亿节能环保科技有限公司 | Steam condensate water waste heat recovery device without drain valve |
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| RU2177450C1 (en) * | 2000-04-14 | 2001-12-27 | Ульяновский государственный технический университет | Method of preparation of make-up water for heat-supply system |
| JP4011845B2 (en) * | 2000-10-13 | 2007-11-21 | 修三 中園 | Method for recovering salt and mineral water from seawater |
| JP2008150995A (en) * | 2006-12-15 | 2008-07-03 | Tlv Co Ltd | Steam ejector |
| CN101706038B (en) * | 2009-11-30 | 2012-07-04 | 重庆智得热工工业有限公司 | Steam jet waste steam recycling device and steam jet waste steam recycling system |
| CN201803601U (en) * | 2010-08-19 | 2011-04-20 | 天威四川硅业有限责任公司 | Comprehensive utilization system for heat energy of reducing furnace |
| CN202215313U (en) * | 2011-08-29 | 2012-05-09 | 南通万达锅炉有限公司 | Waste heat boiler flash vaporization generating set |
| CN103123107B (en) * | 2013-03-06 | 2017-02-15 | 宁波金海晨光化学股份有限公司 | Device for recovering waste heat and supplying steam through multistage dilatation flashing |
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