CN104863651A - Low-temperature waste heat-driven heat and electricity parallel supply method and system implementing same - Google Patents
Low-temperature waste heat-driven heat and electricity parallel supply method and system implementing same Download PDFInfo
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Abstract
A low-temperature waste heat-driven heat and electricity parallel supply method includes the steps that a gathered heat flow containing low-grade waste heat is divided into two streams and injected into two sub-systems respectively; one stream of the heat flow enters a generator and serves as a heat source of an organic rankie cycle system, and the other stream of the heat flow enters an evaporator and serves as a low-temperature heat source of a heat pump system; the two sub-systems are connected through a transmission device, a part of work of an expansion machine of the organic rankie cycle system drives a compressor to meet the power requirement of a heat pump cycle, the remaining work drives a power generator to generate electricity, and therefore heat and electricity parallel supply of the system is achieved. The invention further discloses a low-temperature waste heat-driven heat and electricity parallel supply system. The system comprises an organic rankie cycle sub-system and a heat pump cycle sub-system. High-temperature recycling of the low-grade waste heat is achieved, extra electricity or fossil fuel consumption is reduced, and heat and electricity parallel supply is achieved at the same time.
Description
Technical field
The present invention relates to heat recovery technology field, relate to thermoelectricity confession method and realize system that low temperature exhaust heat drives.
Background technique
In the last few years, China's rapid economic development, energy-output ratio is huge, also there is the problem that energy consumption structure is unreasonable, energy utilization rate is not high simultaneously; Meanwhile, the environmental pollution problem that a large amount of consumption due to traditional energy bring is also day by day serious, how the efficiency utilization energy, alleviate environmental pollution and become one of major issue urgently to be resolved hurrily at present.
A large amount of process needing heating is there is in the production of the mankind, life, as production processes such as chemical industry, printing and dyeing, weaving, papermaking, fiber, leather, Ceramic manufacturing, exist a large amount of to the less demanding heating production process of heat quality, discharge the hot water of a large amount of 60 ~ 100 DEG C simultaneously in its production process, do not utilized.These production processes are generally consume the traditional approach heat supply such as combustion of fossil fuel or electric heating that high-grade energy is cost, what not only reduce the energy utilizes grade, also result in the waste of a large amount of residual heat resources simultaneously, thermo-pollution is to a certain degree caused to environment.
Organic Rankine bottoming cycle (Organic Rankine Cycle, ORC), as a kind of technology that low grade heat energy can be converted into high-grade electric energy or power, becomes the first-selection that low-grade energy utilizes technology.The low grade heat energy stored in low-temperature heat source, as an efficient heat supply process, by consuming a part of high-grade energy, is converted into high-grade heat energy by heat pump techniques, and essence is a kind of energy grade lift technique.Under suitable conditions, by heat pump and organic Rankine bottoming cycle combine with technique, not only can meet the demand of producing heat energy, the consumption of extraneous electric energy or fossil energy can also be reduced, improve energy utilization rate, avoid greenhouse effect and pollution of atmosphere, energy-saving and emission-reduction and environmental protect aspect are had important practical significance.
Summary of the invention
In order to overcome the defect that above-mentioned prior art exists, the object of this invention is to provide the thermoelectricity of a kind of low temperature exhaust heat driving and supply system, native system is the system that organic Rankine bottoming cycle combines with heat pump cycle, and this system can utilize low temperature exhaust heat stream, realizes hot, electric and supplies.
Object of the present invention can be achieved through the following technical solutions:
The thermoelectricity that a kind of low temperature exhaust heat drives is confession method also, is divided into two stocks not inject two subtense angles the hot-fluid comprising low grade residual heat collected; One hot-fluid enters the thermal source of generator as organic rankine cycle system, and another strand of hot-fluid enters the low-temperature heat source of vaporizer as heat pump; Connected by transmission device by two subtense angles, make a decompressor institute work part for organic rankine cycle system drive compressor, meet the power demand of heat pump cycle, the merit of remainder drives electrical power generators, thus realizes the heat of system, electricity supplying.
Further, regulate the hot-fluid flow entering described two subtense angles, realize the output of different hotspot stress to meet the different demand of user.
When the heat of the high-grade heat that system exports more than producing, required for life process, by regulating the low-grade heat flow entering heat pump cycle, the high-grade heat that heat pump is exported meets the high-temperature hot demand of user, remaining low-grade heat flow enters the generator of organic rankine cycle system, exchange heat is carried out with organic working medium, be translated into the gaseous working medium of High Temperature High Pressure, driving decompressor does work, a decompressor institute work part drives compressor to rotate, the merit of remainder drives electrical power generators, realizes heat, is produced from Electricity Federation.
The described hot-fluid comprising low grade residual heat refers to that temperature is not less than the hot-fluid of 60 DEG C, preferably the hot-fluid of 60 ~ 110 DEG C.Waste heat supply temperature can adjust according to the actual requirements and suitably, and temperature upper limit is relevant to the performance of current high temperature compressor.If waste heat supply temperature is too low, systematic function can be reduced; If waste heat supply temperature is too high, higher to the requirement of heat pump cycle compressor, therefore the temperature range of usual described low grade residual heat is advisable within the scope of 60 ~ 110 DEG C.
The described hot-fluid comprising low grade residual heat is not limited to low-grade hot water, as long as comprise the hot-fluid of low grade residual heat.
The thermoelectricity that the low temperature exhaust heat realizing said method drives also for a system, comprises ORC subsystem and heat pump cycle subtense angle;
Described ORC subsystem is made up of generator, generator, decompressor, regenerator, low-temperature condenser, working medium pump, flow control valve and flowmeter, successively described decompressor, regenerator, low-temperature condenser, regenerator and working medium pump are connected in turn by generator pipeline out, finally get back to generator, form organic Rankine cycle circuit; Wherein generator and decompressor are in transmission connection, and flow control valve is connected with generator by pipeline with flowmeter, and the pipeline that hot-fluid enters generator is provided with first flow modulating valve and first-class gauge, realizes the waste heat Flow-rate adjustment of ORC subsystem;
The external recirculated cooling water of low-temperature condenser;
In described ORC subsystem and each pipeline, be provided with ORC subsystem working medium, realize energy trasfer and the transmission of this circulation;
Described heat pump cycle subtense angle is made up of vaporizer, compressor, warm condenser, throttle valve, flow control valve and flowmeter, by described vaporizer one side outlet pipeline out, compressor, warm condenser and throttle valve are connected in turn, finally get back to vaporizer, form heat pump cycle loop; The pipeline that hot-fluid enters vaporizer is provided with second adjustable valve and second gauge, realizes the adjustment of residual heat stream to heat pump subtense angle heat;
In described heat pump cycle subtense angle and each pipeline, be provided with heat pump cycle subtense angle working medium, realize energy trasfer and the transmission of this circulation;
Described ORC subsystem is connected by transmission device with heat pump cycle subtense angle.
Described transmission device is coupling or key, and this transmission device one end is connected with the axle of decompressor, and the other end is connected with the axle of compressor, makes decompressor and compressor realize coaxial running.
Described decompressor adopts radial axial-flow expansion turbine, and compressor adopts centrifugal compressor, and turbine institute work is sent to the axle of compressor by the axle of decompressor by transmission device, drives compressor compresses.
Organic working medium in described ORC subsystem is R134a or R245fa; The refrigeration agent working medium of heat pump cycle subtense angle is R245fa, R143 or R600.
A kind of thermoelectricity also confession method using above-mentioned thermoelectricity also to carry out low temperature exhaust heat driving for system, the low-grade heat flow of recovery is divided into two strands of hot-fluids to enter ORC subsystem and heat pump cycle subtense angle respectively, one hot-fluid enters generator by first flow modulating valve, carries out exchange heat with the organic working medium in ORC subsystem, another strand of hot-fluid enters vaporizer by second adjustable valve, carries out exchange heat with the working medium in heat pump cycle subtense angle, organic working medium in ORC subsystem becomes the gaseous working medium of High Temperature High Pressure after fully absorbing the heat of hot-fluid, decompressor is driven externally to do work, a decompressor institute work part is by the coaxial heat pump cycle compressor be connected of actuator drives and its, another part merit drives electrical power generators, the liquid organic working medium that organic working medium after acting exports with working medium pump in regenerator carries out exchange heat, low pressure organic working medium after heat exchange is through low-temperature condenser condensation heat release, regenerator is entered through working medium pump supercharging, then generator is entered, thus formation organic Rankine bottoming cycle, another strand of hot-fluid is as the low-temperature heat source of heat pump cycle, working medium in heat pump cycle subtense angle absorbs after the heat of hot-fluid by compressor adherence pressure and temperature in vaporizer, the power resources of compressor are in the input work of decompressor, High Temperature High Pressure working medium enters warm condenser and the abundant heat exchange of medium to be heated, working medium after heat exchange enters vaporizer after throttle valve throttling, thus forms heat pump cycle.
A kind of thermoelectricity also confession method using above-mentioned thermoelectricity also to carry out low temperature exhaust heat driving for system: when the high-grade heat of the co-generation unit output of above-mentioned low grade residual heat driving is more than production, heat required for life process, the low-grade heat flow entering heat pump cycle is regulated by second adjustable valve, the high-grade heat that heat pump is exported meets the high-temperature hot demand of user, remaining low-grade heat flow enters the generator of organic rankine cycle system, exchange heat is carried out with organic working medium, be translated into the gaseous working medium of High Temperature High Pressure, driving decompressor does work, a decompressor institute work part drives compressor to rotate, the merit of remainder drives electrical power generators to realize heat, is produced from Electricity Federation.
Owing to adopting such scheme, the invention has the beneficial effects as follows:
(1) can be production technology and high temperature heat source is provided, achieve the recycling of low-grade heat flow, decrease the consumption of electric energy or fossil fuel, meet the thermal demand in production, achieve heat, CCHP;
(2) the hot-fluid flow entering two subtense angles can be regulated, realize the output of different hotspot stress, meet the different demands of user;
(3) eliminate thermo-pollution that low-grade hot water emission causes and the greenhouse effect that combustion of fossil fuel causes and pollution of atmosphere, achieve energy-saving and emission-reduction.
Accompanying drawing explanation
Fig. 1 is the structural representation of an embodiment of the present invention.
Reference character: 1, the first hot-fluid; 2, generator; 3, first-class gauge; 4, generator; 5, first flow modulating valve; 6, residual heat stream; 7, transmission device; 8, second adjustable valve; 9, second gauge; 10, vaporizer; 11, the second hot-fluid; 12, throttle valve; 13, working medium to be heated; 14, warm condenser; 15, working medium after heating; 16, heat pump cycle working medium; 17, compressor; 18, decompressor; 19, regenerator; 20, organic working medium; 21, cooling water; 22, low-temperature condenser; 23 working medium pumps.
Embodiment
Below in conjunction with accompanying drawing illustrated embodiment, the present invention is further illustrated.
Embodiment
The thermoelectricity that low temperature exhaust heat drives also for a system, as shown in Figure 1, comprises ORC subsystem (ORC system) and heat pump cycle subtense angle (HP system).
ORC subsystem is made up of generator 2, generator 4, decompressor 18, regenerator 19, low-temperature condenser 22, working medium pump 23, flow control valve 5 and flowmeter 3, successively decompressor 18, regenerator 19, low-temperature condenser 22, regenerator 19 and working medium pump 23 are connected in turn by generator 2 pipeline out, finally get back to generator 2, form organic Rankine cycle circuit.Wherein generator 4 and decompressor 18 are in transmission connection, and the pipeline that the first described hot-fluid 1 enters generator 2 is provided with first flow modulating valve 5 and first-class gauge 3.Realize the adjustment of the waste heat flow of ORC subsystem.
The external recirculated cooling water 21 of low-temperature condenser 22.
ORC subsystem working medium is present in each pipeline of this subtense angle, realizes energy trasfer and the transmission of this circulation, and heat pump cycle subtense angle working medium is present in the subtense angle pipeline of its correspondence.
Heat pump cycle subtense angle is made up of vaporizer 10, compressor 17, warm condenser 14 throttle valve 12 flow control valve 8 and flowmeter 9;
By vaporizer 10 1 side outlet pipeline out, compressor 17, warm condenser 14 and throttle valve 12 are connected in turn, finally get back to vaporizer 10, form heat pump cycle loop.The pipeline that second hot-fluid 11 enters vaporizer 10 is provided with second adjustable valve 8 and second gauge 9, realizes the adjustment of residual heat stream to heat pump subtense angle heat.
Above-mentioned two subtense angles are connected by transmission device 7.
Transmission device 7 is coupling or key, and this transmission device 7 one end is connected with the axle of decompressor 18, and the other end is connected with the axle of compressor 17, makes decompressor 18 realize coaxial running with compressor 17, improves efficiency of transmission.
Described compressor 17 is coaxially connected with decompressor 18, decompressor 18 can adopt radial axial-flow expansion turbine, compressor 17 can adopt centrifugal compressor, and turbine institute work is sent to the axle of compressor 17 by the axle of decompressor 18 by transmission device, drives compressor 17 to compress.
Organic working medium in described ORC subsystem can be R134a or R245fa etc., and the refrigeration agent working medium of heat pump cycle subtense angle can be R245fa, R143 or R600 etc.
This system can be divided into total heat load operating conditions and part heat load operating conditions (heat, CCHP).
During total heat load operating conditions: the low grade residual heat stream 6 of recovery is divided into two strands of hot-fluids to enter ORC subsystem and heat pump cycle subtense angle respectively, one hot-fluid 1 enters generator 2 by flow control valve 5, carries out exchange heat with the organic working medium 20 in ORC subsystem, another strand of hot-fluid 11 enters vaporizer 10 by flow control valve 8, carries out exchange heat with the working medium 16 in heat pump cycle subtense angle, organic working medium 20 in ORC subsystem becomes the gaseous working medium of High Temperature High Pressure after fully absorbing the heat of hot-fluid 1, decompressor 18 is driven externally to do work, decompressor 18 works are all driven and its coaxial heat pump cycle compressor 17 be connected by transmission device 7, the liquid organic working medium that organic working medium 20 after acting exports with working medium pump 23 in regenerator 19 carries out exchange heat, low pressure organic working medium 20 after heat exchange is through low-temperature condenser 22 condensation heat release, regenerator 19 is entered through working medium pump 23 supercharging, then generator 2 is entered, thus formation organic Rankine bottoming cycle, another strand of hot-fluid 11 is as the low-temperature heat source of heat pump cycle, working medium 16 in heat pump cycle subtense angle absorbs after the heat of hot-fluid 11 in the vaporizer 10 by compressor 17 adherence pressure and temperature, the power resources of compressor 17 are in the input work of decompressor 18, High Temperature High Pressure working medium 16 enters warm condenser 14 and medium 13 to be heated fully heat exchange, working medium 16 after heat exchange enters vaporizer 10 after throttle valve 12 throttling, thus forms heat pump cycle.
(heat during part heat load operating mode, CCHP): when the high-grade heat of the co-generation unit output using above-mentioned low grade residual heat to drive is more than production, heat required for life process, now, the low-grade heat flow entering heat pump cycle is regulated by flow control valve 8, the high-grade heat that heat pump is exported meets the high-temperature hot demand of user, remaining low-grade heat flow enters the generator 2 of organic rankine cycle system, exchange heat is carried out with organic working medium 20, be translated into the gaseous working medium of High Temperature High Pressure, driving decompressor does work, a decompressor institute work part drives compressor 17 to rotate, the merit of remainder drives generator 4 to generate electricity, realize heat, is produced from Electricity Federation.
The present embodiment adopts the coupling system of organic Rankine bottoming cycle and heat pump cycle to reclaim the low-grade heat hydro-thermal amount produced in industrial production, meet the high-grade heat demand in production, reduce the consumption of electric energy or fossil energy, achieve heat, is produced from Electricity Federation, decrease greenhouse effect and pollution of atmosphere; This system can regulate the low-grade heat water flow entering two subtense angles simultaneously, thus realizes the output of different hotspot stress, to meet the different demands of user.
Above-mentioned is can understand and apply the invention for ease of those skilled in the art to the description of embodiment.Person skilled in the art obviously easily can make various amendment to these embodiments, and General Principle described herein is applied in other embodiments and need not through performing creative labour.Therefore, the invention is not restricted to embodiment here, those skilled in the art, according to announcement of the present invention, do not depart from improvement that scope makes and amendment all should within protection scope of the present invention.
Claims (10)
1. the thermoelectricity of a low temperature exhaust heat driving also confession method, is characterized in that: be divided into two stocks not inject two subtense angles the hot-fluid comprising low grade residual heat collected; One hot-fluid enters the thermal source of generator as organic rankine cycle system, and another strand of hot-fluid enters the low-temperature heat source of vaporizer as heat pump; Connected by transmission device by two subtense angles, make a decompressor institute work part for organic rankine cycle system drive compressor, meet the power demand of heat pump cycle, the merit of remainder drives electrical power generators, thus realizes the heat of system, electricity supplying.
2. method according to claim 1, is characterized in that: regulate the hot-fluid flow entering described two subtense angles, realizes the output of different hotspot stress to meet the different demand of user.
3. method according to claim 1, it is characterized in that: when the high-grade heat of system output is more than production, during heat required for life process, by regulating the low-grade heat flow entering heat pump cycle, the high-grade heat that heat pump is exported meets the high-temperature hot demand of user, remaining low-grade heat flow enters the generator of organic rankine cycle system, exchange heat is carried out with organic working medium, be translated into the gaseous working medium of High Temperature High Pressure, driving decompressor does work, a decompressor institute work part drives compressor to rotate, the merit of remainder drives electrical power generators, realize heat, is produced from Electricity Federation.
4. method according to claim 1, is characterized in that: described in comprise the hot-fluid of low grade residual heat temperature be not less than 60 DEG C; Be preferably 60 ~ 110 DEG C.
5. the thermoelectricity that the low temperature exhaust heat realizing arbitrary described method in claim 1-4 drives also for a system, is characterized in that: comprise ORC subsystem and heat pump cycle subtense angle;
Described ORC subsystem is made up of generator, generator, decompressor, regenerator, low-temperature condenser, working medium pump, flow control valve and flowmeter, successively described decompressor, regenerator, low-temperature condenser, regenerator and working medium pump are connected in turn by generator pipeline out, finally get back to generator, form organic Rankine cycle circuit; Wherein generator and decompressor are in transmission connection, and flow control valve is connected with generator by pipeline with flowmeter, and the pipeline that hot-fluid enters generator is provided with first flow modulating valve and first-class gauge, realizes the waste heat Flow-rate adjustment of ORC subsystem;
The external recirculated cooling water of low-temperature condenser;
In described ORC subsystem and each pipeline, be provided with ORC subsystem working medium, realize energy trasfer and the transmission of this circulation;
Described heat pump cycle subtense angle is made up of vaporizer, compressor, warm condenser, throttle valve, flow control valve and flowmeter, by described vaporizer one side outlet pipeline out, compressor, warm condenser and throttle valve are connected in turn, finally get back to vaporizer, form heat pump cycle loop; The pipeline that hot-fluid enters vaporizer is provided with second adjustable valve and second gauge, realizes the adjustment of residual heat stream to heat pump subtense angle heat;
In described heat pump cycle subtense angle and each pipeline, be provided with heat pump cycle subtense angle working medium, realize energy trasfer and the transmission of this circulation;
Described ORC subsystem is connected by transmission device with heat pump cycle subtense angle.
6. the thermoelectricity that low temperature exhaust heat according to claim 5 drives also supplies system, it is characterized in that:
Described transmission device is coupling or key, and this transmission device one end is connected with the axle of decompressor, and the other end is connected with the axle of compressor, makes decompressor and compressor realize coaxial running.
7. the thermoelectricity that low temperature exhaust heat according to claim 5 drives also supplies system, it is characterized in that:
Described decompressor adopts radial axial-flow expansion turbine, and compressor adopts centrifugal compressor, and turbine institute work is sent to the axle of compressor by the axle of decompressor by transmission device, drives compressor compresses.
8. the thermoelectricity that low temperature exhaust heat according to claim 5 drives also supplies system, it is characterized in that:
Organic working medium in described ORC subsystem is R134a or R245fa; The refrigeration agent working medium of heat pump cycle subtense angle is R245fa, R143 or R600.
9. one kind uses thermoelectricity described in claim 5 and carries out the thermoelectricity also confession method of low temperature exhaust heat driving for system, it is characterized in that: the low-grade heat flow (6) of recovery is divided into two strands of hot-fluids to enter ORC subsystem and heat pump cycle subtense angle respectively, one hot-fluid (1) enters generator (2) by first flow modulating valve (5), carries out exchange heat with the organic working medium (20) in ORC subsystem, another burst of hot-fluid (11) enters vaporizer (10) by second adjustable valve (8), carries out exchange heat with the working medium (16) in heat pump cycle subtense angle, the gaseous working medium of High Temperature High Pressure is become after organic working medium (20) in ORC subsystem fully absorbs the heat of hot-fluid (1), decompressor (18) is driven externally to do work, decompressor (18) institute work part is driven and its coaxial heat pump cycle compressor (17) be connected by transmission device (7), another part merit drives generator (4) generating, the liquid organic working medium that organic working medium (20) after acting exports with working medium pump (23) in regenerator (19) carries out exchange heat, low pressure organic working medium (20) after heat exchange is through low-temperature condenser (22) condensation heat release, regenerator (19) is entered through working medium pump (23) supercharging, then generator (2) is entered, thus formation organic Rankine bottoming cycle, another burst of hot-fluid (11) is as the low-temperature heat source of heat pump cycle, by compressor (17) adherence pressure and temperature after the heat of absorption hot-fluid (11) in vaporizer (10) of the working medium (16) in heat pump cycle subtense angle, the power resources of compressor (17) are in the input work of decompressor (18), High Temperature High Pressure working medium (16) enters warm condenser (14) and medium to be heated (13) fully heat exchange, working medium (16) after heat exchange enters vaporizer (10) after throttle valve (12) throttling, thus formation heat pump cycle.
10. one kind uses thermoelectricity described in claim 5 and carries out the thermoelectricity also confession method of low temperature exhaust heat driving for system, it is characterized in that: when the high-grade heat of the co-generation unit output using above-mentioned low grade residual heat to drive is more than production, heat required for life process, the low-grade heat flow entering heat pump cycle is regulated by second adjustable valve (8), the high-grade heat that heat pump is exported meets the high-temperature hot demand of user, remaining low-grade heat flow enters the generation (2) of organic rankine cycle system, exchange heat is carried out with organic working medium (20), be translated into the gaseous working medium of High Temperature High Pressure, driving decompressor does work, a decompressor institute work part drives compressor (17) to rotate, the merit of remainder drives generator (4) generating to realize heat, is produced from Electricity Federation.
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Application publication date: 20150826 |