CN107023813B - A kind of non-steam low temperature exhaust heat recovery system - Google Patents
A kind of non-steam low temperature exhaust heat recovery system Download PDFInfo
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- CN107023813B CN107023813B CN201710285647.7A CN201710285647A CN107023813B CN 107023813 B CN107023813 B CN 107023813B CN 201710285647 A CN201710285647 A CN 201710285647A CN 107023813 B CN107023813 B CN 107023813B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/021—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers with heating tubes in which flows a non-specified heating fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
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- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
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- Sustainable Energy (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention discloses a kind of non-steam low temperature exhaust heat recovery systems, waste heat recovery evaporator including being in vacuum state, heat exchanger tube is installed in waste heat recovery evaporator, heat exchanger tube one end is passed through residual heat resources, enter the first preheater after heat exchange, it is discharged after the heat exchange of the first preheater, first preheater is intake from extra feed tank, entered in the spray tube in waste heat recovery evaporator after being heated in the first preheater by pipeline, spray generates steam on heat exchanger tube, steam is discharged from the pipeline at the top of waste heat recovery evaporator, it subsequently enters vapour compression machine and carries out single-stage or Two-stage Compression.A kind of non-steam low temperature exhaust heat recovery system of the invention, the heat source stream of alternative Boiler Steam can be provided, also be able to satisfy 85~100 DEG C in process flow uses heat demand, moreover it is possible to realize sea water desalination or sewage treatment, while the domestic water with certain temperature that supply can be used directly.
Description
Technical field
The present invention relates to non-steam low temperature exhaust heat recovery systems, belong to industrial processes heat recovery and heat supply neck
Domain.
Background technique
As increasingly sharpening for global energy problem, especially China are there are mass energy intensive industry production process,
Effectively to overcome energy problem, then while new energy development utilizes, needs to be transformed prior art, improve China's industry
The energy utilization rate of production.According to statistics, the residual heat resources discharged in China's industrial processes about account for its energy wastage in bulk or weight
17~67%, in the residual heat resources of different temperatures range, 200 DEG C of low temperature exhaust heats below can account for 63%, and generate low temperature
Many technical process of waste heat are all with this large amount of heat demand, and wherein main heat source is all Boiler Steam；Thus such as
What is effective to recycle cryogenic waste heat resource, improves what the energy utilization rate of technical process was always looked after and studied in recent years
Hot spot.
Function of mechanical steam recompression is a kind of generally acknowledged at present efficient waste heat way of recycling and power-saving technology, and has been obtained very well
Application, cardinal principle is to be improved after its temperature and pressure using vapour compression machine compression Low Temperature Steam as high-grade heat source
It uses, realizes the recycling of steam latent heat.The application of current this power-saving technology is also limited to the recycling of Low Temperature Steam waste heat；
And Low Temperature Steam waste heat is one kind of many cryogenic waste heat resources.The recovery technology of non-steam low temperature exhaust heat mainly includes
Kalina circulation, organic rankie cycle (ORC) and conventional hermetic heat pump cycle.
Kalina circulation and the machine waste heat recovery reason of organic rankie cycle (ORC) are all to make system using low temperature exhaust heat
Working medium evaporation generates high steam, then recycles function or the direct generation of electricity by expanding machine, equipment investment cost is high, energy recovery
Efficiency is lower, and effective application is not yet received so far.Although conventional hermetic heat pump cycle can by evaporator absorb heat and
Condenser heat rejection recycles and utilizes low temperature exhaust heat, but its highest heat source temperature that can be provided or condensation temperature are limited to its institute
Using the highest critical-temperature of working medium, normally no higher than 95 DEG C, and these working medium also need to meet simultaneously certain GWP and
The international indicator requirement of ODP.Therefore it needs to develop the non-steam low temperature exhaust heat that one kind is efficient, can combine with original with thermal process
Recycle and utilize method and technology.
Boiler Steam is mainly derived from electric boiler or coal-burning boiler at present, and generates heat with the method for function of mechanical steam recompression
The method of source steam is to generate the 5%~10% of equivalent steam energy consumption with boiler, so if can be by function of mechanical steam recompression skill
Art is applied to the recycling of non-steam low temperature exhaust heat, has preferable market prospects.In addition to Boiler Steam substitutes, how routine is overcome
The limitation of closed heat pump highest heat source temperature while recycling low temperature exhaust heat, realizes the heat of 100 DEG C or less any heat demands
Recycling or high temperature heat pump technology also have a good application prospect.For many remaining thermogenetic factories, the life of worker is used
Water (including manufacture hot water) also undoubtedly increases along with certain energy consumption and industrial cost, scantily especially for fresh water
Area, it is also necessary to individual desalting plant.
To sum up, how non-steam low temperature exhaust heat is effectively recycled, while meets Boiler Steam substitution, high temperature heat source supply, reality
Existing sea water desalination or sewage treatment simultaneously supply certain temperature domestic water, are urgently to be resolved and have important application and research meaning
The technical problem of justice.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention provides a kind of non-steam low temperature exhaust heat time
Receipts system can provide the heat source stream of alternative Boiler Steam, the correlation heat demand being also able to satisfy in process flow, moreover it is possible to supply
The hot water with certain temperature that should be can be used directly.
Technical solution: in order to solve the above technical problems, a kind of non-steam low temperature exhaust heat recovery system of the invention, including place
In being equipped with heat exchanger tube in the waste heat recovery evaporator of vacuum state, waste heat recovery evaporator, heat exchanger tube one end is passed through waste heat money
Source, by heat exchange after enter the first preheater, the first preheater heat exchange after be discharged, the first preheater from extra feed tank into
Water is entered in the spray tube in waste heat recovery evaporator after heating in the first preheater by pipeline, is sprayed on heat exchanger tube
Steam is generated, steam is discharged from the pipeline at the top of waste heat recovery evaporator.
Preferably, the pipeline at the top of the waste heat recovery evaporator is connect with the first valve, the second valve simultaneously, first
Valve is controlled to a vacuum pump, and the second valve is successively connect with the first vapour compression machine, the second vapour compression machine.
Preferably, the 15th valve is installed between first vapour compression machine and the second vapour compression machine, first
It is connect by pipeline with the second preheater between vapour compression machine and the 15th valve, steam is after the second preheater exothermic condensation
The distilled water of generation enters distilled water tank.
Preferably, the steam that the waste heat recovery evaporator generates goes successively to the second preheating after condensing by condenser
Device heat exchange.
Preferably, the distilled water that is generated after second preheater heat exchange while can also pass into extra feed tank.
Preferably, the bottom of the waste heat recovery evaporator is connect by circulating pump with spray tube.
Preferably, the make-up water in first preheater enters spray after preheating after preheating using the second preheater
In shower pipe.
The utility model has the advantages that non-steam low temperature exhaust heat recovery system of the invention, mechanical vapor recompression technology is applied to
The residual heat resources recycling field of non-cryogenic vapor form, system itself also belong to a kind of using water as the open-type heat pump system of working medium
System: recovery waste heat resource heat generates Low Temperature Steam, then by condensing release heat by condenser after compressor compresses or into one
Step compression provides high temperature, the high steam of alternative Boiler Steam, with utilization Kalina and ORC circulation and stress cogeneration phase
Than system own efficiency is higher, and compared with conventional hermetic heat pump, condenser can provide 90 DEG C or more of high temperature heat source.
In addition, the heat of system recycling can be directly used for or meet the heat demand such as material liquid preheating of process flow, rather than generate
Electricity reduces waste heat and is recovered to the process utilized in the heat by current consuming apparatus using recycling, can improve energy recovery utilization
Rate.At the same time, when make-up water is seawater or sewage, system has both the effect of sea water desalination or sewage treatment, flash distillation simultaneously
Through compressor compresses, the distilled water that then condensation generates can use obtained steam directly as domestic water, and its pre- is vulcanized
After water supply still have certain temperature, in this way, the present invention be also applicable in comparison it is arid or lack domestic water region.To sum up,
The system and control method of institute's valve have good energy-saving effect and market application prospect.
Detailed description of the invention
Fig. 1 is the system schematic of the embodiment of the present invention.
Specific embodiment
It is as described in Figure 1: a kind of non-steam low temperature exhaust heat recovery system of low temperature, including waste heat recovery evaporator 1, the first steam
Compressor 2, the second vapour compression machine 3, condenser 4, the first preheater 6 and the second preheater 5, the waste heat recovery evaporator 1
Top be provided with strainer 1a, spray tube 1b is provided with below strainer 1a, heat exchanger tube 1c is equipped with below the spray tube 1b, it is described
The steam (vapor) outlet of waste heat recovery evaporator 1 passes through the first valve 13 connection vacuum pump 11 all the way, and another way passes through the second valve 14
It is connected with the entrance of the first vapour compression machine 2, the outlet of the first vapour compression machine 2 connects condenser 4 by third valve 15
Steam inlet, the condensation-water drain of the condenser 4 connects the entrance of the second preheater 5, the second preheater condensed water
Way outlet is connected by the 4th valve 21 with distilled water tank 8, and be used for that non-condensing gas to be vented the is equipped at the top of the distilled water tank 8
Five valves 22, outlet at bottom are equipped with the 6th valve 23, are equipped between the water route outlet of the extra feed tank 7 and the first preheater 6
Make-up pump 9 and the 7th valve 25, the supply water out of first preheater 6 is by the 8th valve 18 and the second preheater 5
It feeds water inlet to be connected, the extra feed tank supply water inlet is equipped with the 9th valve 24, and the supply water out of the second preheater 5 passes through
The tenth valve 17 is crossed to be connected with the spray tube 1b entrance of waste heat recovery evaporator 1.
The 11st valve 20 is equipped between the condensation-water drain and extra feed tank 7 of second preheater 5.In order to adapt to not
With water spray and shower water temperature control needs, between the supply water out and spray tube 1b entrance of first preheater 6
The 12nd valve 19 equipped with bypass.
The 13rd valve 12 is equipped between the residual heat resources pipeline and the heat exchanger tube 1c entrance of waste heat recovery evaporator 1,
The outlet heat exchanger tube 1c is connected with the entrance of the first preheater 6, between 1 outlet at bottom of waste heat recovery evaporator and spray tube 1b entrance
Equipped with water circulating pump 10 and the 14th valve 26.The tenth is equipped between the outlet of second vapour compression machine 3 and the first vapour compression machine 2
Five valves 16 are equipped with the 16th valve 27 of bypass between the outlet of first vapour compression machine 2 and the second preheater 5.
Embodiment of the method
A kind of control method of the non-steam low temperature exhaust heat recovery system of low temperature, includes the following steps:
Step 1: closing 1 all outlet ports valve of waste heat recovery evaporator, opens the first valve 13, and it is right to open vacuum pump 11
Waste heat recovery evaporator 1 vacuumizes, and the first valve 13 and vacuum pump 11 are closed when vacuum degree is minimum；
Step 2: the 13rd valve 12 is opened, residual heat resources are passed through in the heat exchanger tube of waste heat recovery evaporator 1, from changing
The residual heat resources of heat pipe outflow are discharged after continuing to flow into the first preheater 6 preheating make-up water；At the same time, the 7th valve 25 is opened
With make-up pump 9 and the tenth valve 17 of valve and the 8th valve 18, the water in extra feed tank passes through the first preheater 6 and second
It is sprayed into after preheater 5 by spray tube 1b in the waste heat recovery evaporator 1 of vacuum state, since make-up water flows through the first preheater
Have when 6 and preheated by residual heat resources, water temperature there can be certain raising, can make in pressure difference when spraying into vacuum state waste heat recovery evaporator 1
With lower generation low-flash vapour, the water not flashed can flow through heat exchanger tube 1c, and the heat of vaporization generation for continuing to absorb residual heat resources is low
Warm steam；
Then the second valve 14 and the first vapour compression machine 2 are opened, 1 slow-speed of revolution of the first vapour compression machine is run,
Third valve 15 is closed, the 16th valve 27 is opened, so that compressed steam is directly entered the second preheater 5, because of compressed steam temperature
Degree can be higher than flowing out the residual heat resources temperature of heat exchanger tube 1c, so the make-up water of the first preheater 6 of outflow can be in the second preheater
The interior heat for absorbing compressed steam, is further preheated；And compressed steam itself is condensed into the distilled water with certain temperature and leads to
It crosses the 11st valve 20 and flows into extra feed tank, for promoting the temperature of make-up water in extra feed tank, and then spray tube 1b can be made
The spray coolant-temperature gage at place reaches certain value, thus the suction stripping temperature of the first compressor 2 of guarantee centainly and pressure and steam
Flow；
Step 3: when the liquid level of 1 bottom of waste heat recovery evaporator reaches certain value, water circulating pump 10 and the 14th is opened
Valve 26 makes unevaporated shower water spray into heat recovery heat exchanger 1 by spray tube 1b together with the make-up water that preheater 5 comes out
It is interior, continue to participate in system circulation；When system does sea water desalination or sewage treatment, in order to adjust Circulation water density, need portion
Divide the recirculated water discharge of high concentration；
Step 4: as spray coolant-temperature gage is increased to certain value, the quantity of steam that waste heat recovery evaporator 1 generates constantly increases
Add, the running speed of the first vapour compression machine 2 is gradually increased, when revolving speed reaches certain value, closes the 16th valve 27, open
Third valve 15 makes compressed steam flow into condenser 4, by condenser 4 using the heat of compressed steam condensation release as 100 DEG C
High temperature heat source below uses, and can be used for the different preheatings or heating link of process flow；
The distilled water being condensed into flows into the make-up water before the second preheater 5 preheating spray, and temperature can pass through the 4th after reducing
Valve 21 flows into distilled water tank 8, opens simultaneously the 5th valve 22 for the emptying of non-condensing gas, also adjustable 11st valve
The aperture of door 20 flows into part distilled water in extra feed tank 7；
Step 5: when the operation of 2 rated speed of the first compressor, the aperture of adjustable 15th valve 16 makes part
Compressed steam enters the continuation of the second vapour compression machine 3 and is compressed, and becomes the heat source that can directly substitute Boiler Steam after increasing temperature and pressure
Steam；
Step 6: when not needing to provide heat source by condenser 4, third valve 15 can be closed, fully opens the 15th
Valve 16 makes the steam discharge of the first vapour compression machine 2 be directly entered the second vapour compression machine 3, continues to become after compressing increasing temperature and pressure
The heat source stream of alternative Boiler Steam；
When condenser 4 does not work, the second preheater 5 will be flowed into without condensed water, in order to guarantee certain spray tube 1b
The spray coolant-temperature gage at place, makes system stable operation, and the aperture of the 16th valve 27 is adjusted, and draws a small amount of first vapour compression machine
2 compressed steams come out enter the second preheater 5 and preheat make-up water.
Consider reducing along journey flow passage resistance force of waterproof and because of water flow and pressure head caused by water spray outflow for water, the spray tube 1b
Spray orifice diameter be gradually increased along the process of water, to ensure the uniform spray water flow in each aperture.The water circulating pump
Liquid level in 10 water flows pumped out and heat recovery heat exchanger 1 is positively correlated.
The distilled water that compressed steam condensation generates, by the 11st valve 20 flow into the water flow of extra feed tank 7 with
Water temperature is negatively correlated in extra feed tank 7；Water level is negative in the aperture and supply case of 9th valve 24 of the supply water inlet of extra feed tank 7
Correlation controls the water level and water temperature in extra feed tank, maintains system by the inflow of certain temperature distilled water and low temperature make-up water
Temperature operation can also be achieved the adjustment effect of feed water temperature when operating condition variation.
When the compressed steam of the first vapour compression machine of part 2 enters the second vapour compression machine 3, the steaming of condenser 4 is flowed into
Flow-reduction is evaporated, the aperture of the 8th valve 18 and the tenth valve 17 need to be adjusted, control enters the supply water of the second preheater 5,
Stablize the condensed water/distillation coolant-temperature gage for flowing out the second preheater 5 in certain value, and then ensure the water temperature in distilled water tank 8,
Warm water in distilled water tank 8 is capable of direct drinking or uses as domestic water；The setting of tenth valve 17 is primarily to avoid
The water that water circulating pump 10 comes out flows into the second preheater 5.
When system, which does not provide heat source by condenser 4, directly provides high pressure, high-temperature steam operation, it to be used for extension
27 aperture regulation of the 16th valve of compressed steam preheating make-up water is controlled by the spray coolant-temperature gage at spray tube 1b, corresponding other
The aperture regulation of general 12nd valve 19 is controlled by spray coolant-temperature gage and water spray simultaneously.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (1)
1. a kind of non-steam low temperature exhaust heat recovery system, it is characterised in that: including waste heat recovery evaporator (1), the first vapour pressure
Contracting machine (2), the second vapour compression machine (3), condenser (4), the first preheater (6) and the second preheater (5)；The waste heat recycling
It is provided at the top of evaporator (1) strainer (1a), is provided with spray tube (1b) below strainer (1a), below the spray tube (1b)
Equipped with heat exchanger tube (1c)；
Described heat exchanger tube (1c) one end is passed through residual heat resources, enters the first preheater (6) after heat exchange, in the first preheater
(6) it is discharged after exchanging heat；First preheater (6) water inlet from extra feed tank (7), passes through pipe after heating in the first preheater (6)
Road enters in the spray tube (1b) in waste heat recovery evaporator (1), and spray generates steam on heat exchanger tube, and steam is recycled from waste heat
Pipeline discharge at the top of evaporator；
The water route of the extra feed tank (7) is exported is equipped with make-up pump (9) and the 7th valve between the first preheater (6)
(25), the supply water out of first preheater (6) passes through the supply water inlet phase of the 8th valve (18) and the second preheater (5)
Even, the supply water out of second preheater (5) passes through the spray tube of the tenth valve (17) and waste heat recovery evaporator (1)
(1b) entrance is connected；
The 12nd valve of bypass is equipped between the supply water out and spray tube (1b) entrance of first preheater (6)
(19)；
Pipeline at the top of the waste heat recovery evaporator (1) is connect with the first valve (13), the second valve (14) simultaneously, the first valve
Door (13) connect with vacuum pump (11), the second valve (14) successively with the first vapour compression machine (2), the second vapour compression machine (3)
Connection；
Steam inlet of first vapour compression machine (2) outlet by third valve (15) connection condenser (4), the condensation
The entrance of the condensation-water drain connection the second preheater (5) of device (4), the second preheater (5) condensed water way outlet is by the
Four valves (21) are connected with distilled water tank (8), the distilled water generated after second preheater (5) heat exchange while can also pass into
To in extra feed tank (7)；
15th valve (16) is installed between first vapour compression machine (2) and the second vapour compression machine (3), described first
It is connect by pipeline with the second preheater (5) between vapour compression machine (2) and the 15th valve (16)；First both vapor compression
The 16th valve (27) of bypass is equipped between machine (2) outlet and the second preheater (5)；
The bottom of the waste heat recovery evaporator (1) is connect by circulating pump (10) with spray tube.
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| CN201710285647.7A CN107023813B (en) | 2017-04-27 | 2017-04-27 | A kind of non-steam low temperature exhaust heat recovery system |
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| CN201710285647.7A CN107023813B (en) | 2017-04-27 | 2017-04-27 | A kind of non-steam low temperature exhaust heat recovery system |
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| CN107023813B true CN107023813B (en) | 2019-11-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110655133B (en) * | 2018-10-29 | 2021-02-02 | 山东大学 | Seawater concentration intelligent control method of circulating spray heat exchange system |
| CN109626466B (en) * | 2019-01-23 | 2021-11-09 | 江苏科技大学 | High-temperature sewage treatment and distilled water preparation system and control method thereof |
| CN110864346A (en) * | 2019-11-19 | 2020-03-06 | 苏州乐宏环保科技有限公司 | Vacuum negative pressure heating system |
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Effective date of registration: 20220127 Address after: 215127 c409, No. 99, Ren'ai Road, Suzhou Industrial Park, Jiangsu Province Patentee after: Suzhou Xiangyun Energy Saving Technology Co.,Ltd. Address before: 212003, No. 2, Mengxi Road, Zhenjiang, Jiangsu Patentee before: JIANGSU University OF SCIENCE AND TECHNOLOGY |
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