CN107702367A - A kind of driving combined power and cooling system of low-temperature heat source based on carbon dioxide working medium and method of work - Google Patents
A kind of driving combined power and cooling system of low-temperature heat source based on carbon dioxide working medium and method of work Download PDFInfo
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- CN107702367A CN107702367A CN201710884209.2A CN201710884209A CN107702367A CN 107702367 A CN107702367 A CN 107702367A CN 201710884209 A CN201710884209 A CN 201710884209A CN 107702367 A CN107702367 A CN 107702367A
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- carbon dioxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
- F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
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Abstract
The invention discloses a kind of driving combined power and cooling system of low-temperature heat source based on carbon dioxide working medium and method of work,Including the carbon dioxide turbine to be generated electricity for supercritical carbon dioxide expansion work,The aerial condenser of its output end connection is cooled down the exhaust steam after acting,Aerial condenser output end is connected with the choke valve for expanding carbon dioxide,The output end of choke valve is connected with for the condensation of carbon dioxide to be exchanged to the cooler in environment,Cooler output end is connected with for compressing carbon dioxide to the compressor of high pressure conditions,The present invention utilizes industrial low-temperature thermal source,Carbon dioxide power cycle and kind of refrigeration cycle organically combine,Realize a kind of driving combined power and cooling system of low-temperature heat source based on carbon dioxide working medium,Low-temperature heat source in the industry of more difficult recovery in the past rationally efficient utilize has been subjected to,It is applied not only to generate electricity and instead of existing factory using electric power as energy cold source equipment,Improve energy utilization rate,Reduce energy expenditure.
Description
Technical field
The invention belongs to the recovery of middle low temperature heat energy, Refrigeration Engineering and power engineering technology field, and in particular to one kind is based on
The driving combined power and cooling system of low-temperature heat source and method of work of carbon dioxide working medium.
Background technology
With the rapid development of China's economy, the consumption to the energy is increasing, and extensive industrial activity generates largely
Temperature is relatively low and is difficult to the low grade heat energy recycled, waste gas, the waste residue that more typically temperature is 150 DEG C or so.This
Class low-grade energy is all the time all because higher cost recovery and technical difficulty are not efficiently used, but the damage of these heat energy
The a big chunk for having accounted for industrial energy dissipation is lost, therefore such low-temperature heat source is recycled using suitable technology
To reducing industrial energy consumption, realize that sustainable development tool is of great significance.
Carbon dioxide is a kind of nontoxic, stable, the gas that can be obtained extensively, and its thermodynamic properties is also very outstanding, because
This has the much research to carbon dioxide power cycle in recent years.But carbon dioxide, which utilizes, two comparison distinct issues：The
First, the condensation temperature of carbon dioxide is 31.1 DEG C, close with room temperature, carbon dioxide recycle is inevitable near or above critical point
Area operation, the condensation to carbon dioxide needs to pay larger cost；Second is that carbon dioxide has under supercritical pressure
There is the characteristics of specific heat is big, thermal conductivity factor is high, dynamic viscosity is small, therefore carbon dioxide recycle is typically all with supercritical carbon dioxide
Come what is run, the operating pressure of such system is very high, it is therefore desirable to provides larger compression horsepower for Rankine cycle.
In addition, refrigerating and air conditioning industry, in order to adapt to eliminating for conventional refrigeration working medium, new working medium is generally found in beginning, wherein
Natural refrigerant using carbon dioxide as representative has attracted substantial amounts of sight.Nowadays, carbon dioxide refrigeration circulates to have obtained generally
Research and utilization, carbon dioxide not only has fewer environmental impacts, and because the refrigerating effect per unit swept volume of carbon dioxide is than one
As refrigeration working medium it is much bigger therefore relatively small for the system of identical refrigerating capacity, the volume of system.
Although carbon dioxide refrigeration and power cycle have relatively broad research, both are not combined with
To realize the research of combined power and cooling.At present in industrial processes, the Land use systems of low temperature exhaust heat are usually directly abandoned or entered
The poorly efficient recovery of row, substantial amounts of energy loss is caused, and it is generally to pass through electricity to freeze in factory or need the link of cold
It can freeze, thus cause the energy dissipation in industrial processes, advocate the present age of low-carbon environment-friendly and sustainable development
Society, such system obviously do not meet the requirement in epoch.
The content of the invention
In order to solve the above problems, it is an object of the invention to provide a kind of low-temperature heat source drive based on carbon dioxide working medium
Ejector half combined power and cooling system and method for work, the present invention reduce industrial energy consumption, meet a variety of energy to rationally utilizing low-grade heat source
Amount demand, realize that sustainable development tool is of great significance, the invention mainly relates to the recycling of middle low temperature heat energy, refrigeration
It is that prior art is discussed in detail below with the knowledge in terms of power engineering technology.
To achieve these goals, the technical solution adopted by the present invention is a kind of Low Temperature Thermal based on carbon dioxide working medium
The driving combined power and cooling system in source, including the carbon dioxide turbine to be generated electricity for supercritical carbon dioxide expansion work, it is exported
The aerial condenser of end connection is cooled down the exhaust steam after acting, and aerial condenser output end is connected with for expanding titanium dioxide
The choke valve of carbon, the output end of choke valve are connected with for the condensation of carbon dioxide to be exchanged to the cooler in environment, cooling
Device output end is connected with for compressing carbon dioxide to the compressor of high pressure conditions, and the output end of compressor, which is connected with turn, to be used for
Absorb heat from heat source and heat the preheater and evaporator of carbon dioxide, the output end of evaporator is connected to carbon dioxide turbine
Input, the carbon dioxide after will heat up, which is sent into carbon dioxide turbine, carries out acting generating, is all provided with preheater and evaporator
It is equipped with and introduces the heat exchange pipeline that low grade heat energy carries out heat exchange with carbon dioxide.
The outlet of heat exchange pipeline connects with the entrance in forewarmer heat exchange tube road on evaporator.
Heat carrier is water in the heat exchange pipeline of preheater and evaporator.
The heat release pipeline for carrying out heat exchange with carbon dioxide is provided with cooler, the import of heat release pipeline is normal temperature
Air, enter interior through heat exchange cooling heel row.
The heat absorbing conduit for carrying out heat exchange with carbon dioxide is provided with aerial condenser, the import of heat absorbing conduit is
Normal temperature air, enter interior through heat exchange heating heel row.
Present invention also offers a kind of work of the driving combined power and cooling system of low-temperature heat source based on carbon dioxide working medium
Method, first, working medium carbon dioxide are compressed and are heated under high-temperature high-pressure state carrying out expansion into carbon dioxide turbine doing
Work(generate electricity, the exhaust steam air inlet condenser after the completion of acting under normal temperature and atmospheric pressure state by air setting, two to be condensed
Carbonoxide enters process of refrigerastion, is expanded to low-pressure low-temperature state in choke valve first, afterwards into passing cold in cooler
Being handed to needs in cooled environment, realizes the process of refrigeration；Carbon dioxide is compressed by the compressor to high pressure conditions afterwards, is entered
Dynamic process, introduce low grade heat energy by preheater and evaporator stage and carbon dioxide is heated, carbon dioxide is changed into
High pressure-temperature state enters carbon dioxide turbine and carries out expansion work generating.
The output end that the input of carbon dioxide turbine is connected to evaporator is used to receive the working medium under high-temperature high-pressure state
Carbon dioxide.
The present invention proposes a kind of driving cold electricity of the low-temperature heat source for combining carbon dioxide refrigeration and power cycle advantage
Co-generation system, using the low-temperature heat quantity in industry as circulation thermal source, while realize generating and refrigeration.Working medium carbon dioxide is in evaporator
After middle heat absorption, first carry out expansion work and condensed under normal pressure, normal temperature, the overcritical working medium after condensing, which enters, freezed
Journey, cold energy is provided in heat exchanger after being expanded in choke valve, be directly compressed by the compressor afterwards to needed for power cycle compared with
High pressure, into dynamic process.The compression process of carbon dioxide refrigeration and power cycle is integrated into a process by this circulation, is carried
The high efficiency of compression process, process of refrigerastion can also provide heat for dynamic process, improve system capacity utilization rate.
Compared with prior art, the present invention at least has the advantages that, the present invention utilizes industrial low-temperature thermal source, two
Carbonoxide power cycle and kind of refrigeration cycle organically combine, and realize a kind of low-temperature heat source based on carbon dioxide working medium and drive
Ejector half combined power and cooling system, low-temperature heat source in the industry of more difficult recovery in the past rationally efficient utilization is subjected to, has been applied not only to
Generate electricity and instead of existing factory using electric power as energy cold source equipment, improve efficiency of energy utilization, reduce energy expenditure.
In addition, the process of refrigerastion of carbon dioxide recycle and dynamic process have been carried out into organic integration, process of refrigerastion and dynamic process are total to
Condensation with compression process, while dynamic process carbon dioxide is completed by process of refrigerastion, and process of refrigerastion is also power
Process provides partial heat energy, and the capacity usage ratio of whole system will have than single carbon dioxide power cycle and kind of refrigeration cycle
Improved.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the new combined power and cooling critical-cross carbon dioxide circulatory system T-s figures of low-temperature heat source of the present invention driving.
In accompanying drawing：1st, carbon dioxide turbine；2nd, aerial condenser；3rd, choke valve；4th, cooler；5th, compressor；6th, preheat
Device；7th, evaporator.
Embodiment
The present invention will be further described with reference to the accompanying drawings and detailed description.
As shown in figure 1, the system of the present invention is by carbon dioxide turbine 1, aerial condenser 2, choke valve 3, cooler 4, pressure
Contracting machine 5, preheater 6 and evaporator 7 form, and carbon dioxide turbine is the device of supercritical carbon dioxide expansion work, Zhi Houlian
The aerial condenser connect is cooled down the exhaust steam after acting, and choke valve thereafter is used to expand carbon dioxide, cooling afterwards
Device is used to exchange the condensation of carbon dioxide into environment, and subsequent compressor is to be used to compress carbon dioxide to high pressure conditions,
Its latter linked preheater and evaporator are used to absorb heat from heat source and heat carbon dioxide.
In the present embodiment, the aerial condenser of the output end connection of carbon dioxide turbine 1 is cold by the exhaust steam progress after acting
But, the output end of aerial condenser 2 is connected with the choke valve 3 for expanding carbon dioxide, and the output end of choke valve 3, which is connected with, to be used for
The condensation of carbon dioxide is exchanged to the cooler 4 in environment, the output end of cooler 4 is connected with paramount for compressing carbon dioxide
The compressor 5 of pressure condition, the output end of compressor 5 are connected with turn for absorbing heat from heat source and heating the preheating of carbon dioxide
Device 6 and evaporator 7, the output end of evaporator 7 are connected to the input of carbon dioxide turbine 1, and the carbon dioxide after will heat up is sent
Enter and acting generating is carried out in carbon dioxide turbine 1, be provided with preheater 6 and evaporator 7 and introduce low grade heat energy and dioxy
Change the heat exchange pipeline that carbon carries out heat exchange, the heat release pipeline for carrying out heat exchange with carbon dioxide is provided with cooler 4, is put
The import of hot channel is normal temperature air, enters interior through heat exchange cooling heel row, is provided with and is used for and carbon dioxide on aerial condenser 2
The heat absorbing conduit of heat exchange is carried out, the import of heat absorbing conduit is normal temperature air, enters interior through heat exchange heating heel row.
In a certain embodiment of the present invention, heat carrier is water in the heat exchange pipeline of preheater 6 and evaporator 7, evaporator 7
The outlet of upper heat exchange pipeline connects with the entrance of the heat exchange pipeline of preheater 6.
The work T-s figures of present system circulation are as shown in Fig. 2 wherein 1-2 is compression process, and refrigeration and dynamic process are all
Participate in this compression process；2-3-4 is dynamic process；4-5 is air setting process；5-6-1 is process of refrigerastion.What is circulated is worked
Journey is as follows：Working medium carbon dioxide is compressed and is heated to carrying out expansion work into carbon dioxide turbine 1 under high-temperature high-pressure state
(corresponding T-s Fig. 3-4 processes), the exhaust steam air inlet condenser 2 after the completion of acting is (right by air setting under normal temperature, normal pressure
Answer T-s Fig. 4-5 processes), enter process of refrigerastion after the carbon dioxide being condensed, be expanded to low pressure, low in choke valve 3 first
Temperature state (corresponding T-s Fig. 5-6 processes), need in cooled environment into being transferred to cold in cooler 4, realize afterwards
The process (corresponding T-s Fig. 6-1 processes) of refrigeration, carbon dioxide is compressed to high pressure conditions by compressor 5 and (corresponds to T-s Fig. 1-2 afterwards
Process), into dynamic process, by the heating (corresponding T-s Fig. 2-3 processes) of preheater 6 and evaporator 7, carbon dioxide is changed into
High pressure, the condition of high temperature.The output of this circulation is electric energy and cold energy, and electric energy quantum of output can use W3-4Represent, deduct and drive compressor
Part can be expressed as W3-4-W1-2, cold energy output can use Q6-1Represent.Energy input is the input quantity of low-temperature heat source, is represented
For Q2-3.Therefore the efficiency of the circulation can be expressed as：
In this circulation, process of refrigerastion and dynamic process have shared compression process, and the condensation of dynamic process carbon dioxide is
Completed by process of refrigerastion, and process of refrigerastion also provides partial heat energy for dynamic process, so dynamic process and process of refrigerastion
It is complementary process, the capacity usage ratio of whole system will be than single carbon dioxide power cycle and kind of refrigeration cycle
Improve.
Claims (7)
1. the driving combined power and cooling system of a kind of low-temperature heat source based on carbon dioxide working medium, it is characterised in that including for surpassing
The carbon dioxide turbine (1) that critical carbon dioxide expansion work generates electricity, the aerial condenser (2) of its output end connection is by after acting
Exhaust steam cooled down, aerial condenser (2) output end is connected with the choke valve (3) for expanding carbon dioxide, choke valve (3)
Output end be connected with for the condensation of carbon dioxide to be exchanged to the cooler (4) in environment, the connection of cooler (4) output end
Have and be connected with turn for compressing carbon dioxide to the compressor (5) of high pressure conditions, the output end of compressor (5) for absorbing heat
Source heat and the preheater (6) and evaporator (7) for heating carbon dioxide, it is saturating that the output end of evaporator (7) is connected to carbon dioxide
The input of flat (1), the carbon dioxide after will heat up, which is sent into carbon dioxide turbine (1), carries out acting generating, preheater (6) and
It is provided with evaporator (7) and introduces the heat exchange pipeline that low grade heat energy carries out heat exchange with carbon dioxide.
2. the driving combined power and cooling system of a kind of low-temperature heat source based on carbon dioxide working medium according to claim 1, its
Be characterised by, on evaporator (7) outlet of heat exchange pipeline connected with the entrance of preheater (6) heat exchange pipeline.
3. the driving combined power and cooling system of a kind of low-temperature heat source based on carbon dioxide working medium according to claim 1, its
It is characterised by, heat carrier is water in the heat exchange pipeline of preheater (6) and evaporator (7).
4. the driving combined power and cooling system of a kind of low-temperature heat source based on carbon dioxide working medium according to claim 1, its
It is characterised by, the heat release pipeline for carrying out heat exchange with carbon dioxide is provided with cooler (4), and the import of heat release pipeline is
Normal temperature air, enter interior through heat exchange cooling heel row.
5. the driving combined power and cooling system of a kind of low-temperature heat source based on carbon dioxide working medium according to claim 1, its
It is characterised by, the heat absorbing conduit for carrying out heat exchange with carbon dioxide is provided with aerial condenser (2), and heat absorbing conduit enters
Mouth is normal temperature air, enters interior through heat exchange heating heel row.
A kind of 6. method of work of the driving combined power and cooling system of low-temperature heat source based on carbon dioxide working medium, it is characterised in that
First, working medium carbon dioxide is compressed and is heated to entering carbon dioxide turbine (1) progress expansion work under high-temperature high-pressure state
Generate electricity, the exhaust steam air inlet condenser (2) after the completion of acting under normal temperature and atmospheric pressure state by air setting, two to be condensed
Carbonoxide enters process of refrigerastion, is expanded to low-pressure low-temperature state in choke valve (3) first, is incited somebody to action afterwards into cooler (4) is middle
Cold, which is transferred to, to be needed in cooled environment, realizes the process of refrigeration；Carbon dioxide is compressed to high pressure by compressor (5) afterwards
State, into dynamic process, introduce low grade heat energy by preheater (6) and evaporator (7) stage and carbon dioxide is added
Heat, carbon dioxide are changed into high pressure-temperature state and carry out expansion work generating into carbon dioxide turbine (1).
7. method of work according to claim 6, it is characterised in that the input of carbon dioxide turbine (1) is connected to steaming
The output end of hair device (7) is used to receive the working medium carbon dioxide under high-temperature high-pressure state.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109944653A (en) * | 2019-04-28 | 2019-06-28 | 天津商业大学 | A kind of carbon dioxide trans-critical cycle combined power and cooling system |
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| US20100307169A1 (en) * | 2007-11-15 | 2010-12-09 | The Regents Of The University Of California | Trigeneration system and method |
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Application publication date: 20180216 |