CN111895477A - Industrial waste heat secondary utilization system and method - Google Patents
Industrial waste heat secondary utilization system and method Download PDFInfo
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- CN111895477A CN111895477A CN202010768523.6A CN202010768523A CN111895477A CN 111895477 A CN111895477 A CN 111895477A CN 202010768523 A CN202010768523 A CN 202010768523A CN 111895477 A CN111895477 A CN 111895477A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D11/00—Central heating systems using heat accumulated in storage masses
- F24D11/02—Central heating systems using heat accumulated in storage masses using heat pumps
- F24D11/0214—Central heating systems using heat accumulated in storage masses using heat pumps water heating system
- F24D11/0235—Central heating systems using heat accumulated in storage masses using heat pumps water heating system with recuperation of waste energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
- F01K25/103—Carbon dioxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
- F01K27/02—Plants modified to use their waste heat, other than that of exhaust, e.g. engine-friction heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K9/00—Plants characterised by condensers arranged or modified to co-operate with the engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/20—Geothermal collectors using underground water as working fluid; using working fluid injected directly into the ground, e.g. using injection wells and recovery wells
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2200/00—Heat sources or energy sources
- F24D2200/12—Heat pump
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/40—Geothermal heat-pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention provides an industrial waste heat secondary utilization system and a method, wherein the industrial waste heat secondary utilization system comprises a working medium pump and a first evaporator which are connected in series, a carrier of industrial waste heat can transfer heat to a working medium in the first evaporator, the industrial waste heat secondary utilization system also comprises a condenser which is connected in series on the working medium output end of the first evaporator, a second flow regulating valve and an expansion machine which are connected in series between the first evaporator and the condenser, the second flow regulating valve and the expansion machine are arranged in parallel, and a generator is connected with the expansion machine. The industrial waste heat secondary utilization system can effectively improve the utilization rate of industrial waste heat and is beneficial to energy conservation and emission reduction.
Description
Technical Field
The invention relates to the technical field of energy recovery, in particular to an industrial waste heat secondary utilization system and an industrial waste heat secondary utilization method.
Background
Energy is an important foundation for economic development and social progress, and energy conservation and emission reduction are key problems for better modernized construction and economic development in China. In the industrial production process, a large amount of waste heat resources are discharged, wherein the waste heat resources are exhaust gas with a certain temperature, discharged liquid and heat energy contained in high-temperature materials to be cooled. The waste heat belongs to secondary energy, is rich in resources in China, widely exists in power station boilers and industrial equipment, and the secondary utilization of the existing industrial waste heat mainly relates to high-grade waste heat with high temperature, has low utilization rate of low-grade waste heat with low temperature, directly discharges a large amount of heat, causes environmental pollution, wastes a large amount of resources and aggravates the environmental pollution.
The heat pump technology is a technology that has been developed in recent years, and a heat pump is a device that can take heat from a low-temperature object and transfer the low-temperature heat to a high-temperature object under a small amount of high potential energy as a compensation condition. Through the heat pump, people can obtain a large amount of low-grade heat energy from engineering natural world or industrial waste heat, so that the low-grade heat energy is converted into high-grade heat energy which can be utilized. In the prior art, a technology for absorbing heat from low-grade industrial waste heat resources by using a heat pump technology for heating residents is gradually developed, but the prior art has the following problems: the temperature of the industrial waste heat is unstable, and when the temperature of the industrial waste heat is higher than the heating requirement, the redundant heat of the industrial waste heat is still meaninglessly discharged; causing energy waste.
Disclosure of Invention
In view of this, the present invention provides an industrial waste heat secondary utilization system, so as to improve the utilization rate of industrial waste heat.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the utility model provides an industrial waste heat reutilization system, is including working medium pump, the first evaporimeter of concatenating, and the carrier of industrial waste heat can be in with heat transfer to working medium in the first evaporimeter, industrial waste heat reutilization system still includes:
the expansion machine is connected with the working medium output end of the first evaporator, and a first flow regulating valve is arranged between the expansion machine and the first evaporator; the expander is used for converting the internal energy of the high-temperature and high-pressure working medium output by the first evaporator into mechanical energy, and is connected with a generator which is used for converting the mechanical energy of the expander into heat energy;
the working medium input end of the condenser is connected with the working medium output end of the expansion machine and the working medium output end of the first evaporator, and a second flow regulating valve is arranged between the condenser and the first evaporator; the working medium output end of the condenser is connected with the working medium input end of the working medium pump; a medium inflow end for enabling a heating medium to flow in and a medium outflow end for enabling the medium to flow out are arranged on the condenser; the working medium with high temperature can transfer heat to the medium, and the medium can be used for heating of external users.
The system further comprises a ground heat storage assembly, the ground heat storage assembly and the expansion machine are connected in parallel and are arranged at a working medium output end of the first evaporator, and a third flow regulating valve is arranged between the ground heat storage assembly and the first evaporator; the high-temperature working medium can transfer heat to the geothermal heat storage assembly, and the geothermal heat storage assembly is used for storing the heat.
Further, the geothermal heat storage assembly comprises a second evaporator, a geothermal exploitation well and a geothermal recharge well; and a first pipeline for inputting and outputting the working medium is arranged on the second evaporator, and a second pipeline for circulating underground water between the geothermal exploitation well and the geothermal recharge well is arranged on the second evaporator so as to be used for heat exchange between the working medium and the underground water.
Furthermore, a circulation pipeline is arranged between the working medium output end of the working medium pump and the working medium input end of the second evaporator, and a fourth flow regulating valve is arranged on the circulation pipeline.
Furthermore, a communicating pipeline is arranged between the working medium output end of the second evaporator and the working medium input end of the expansion machine, and a fifth flow regulating valve is arranged on the communicating pipeline.
Further, the carrier is a gas or a liquid.
Further, the working medium is carbon dioxide.
Compared with the prior art, the invention has the following advantages:
(1) according to the industrial waste heat secondary utilization system, the expander and the condenser are arranged at the working medium output end of the first evaporator, so that the low-temperature working medium is input into the first evaporator by the working medium pump, the carrier of the industrial waste heat transfers heat to the working medium, the high-temperature working medium can selectively and directly enter the condenser, and the heat is transferred to the heat supply carrier for the user to warm; when the heat of the industrial waste heat exceeds the heating requirement of a user, part of high-temperature working medium can directly enter the condenser to normally heat the user, and the rest of the working medium can partially enter the expander to push the expander to do work, so that the heat of the industrial waste heat is converted into mechanical energy of the expander, and the expander does work on the generator to convert the mechanical energy into electric energy; therefore, the heating requirement of a user is met, meanwhile, redundant heat is converted into electric energy, and the utilization rate of industrial waste heat is improved.
(2) Through the heat-retaining subassembly with setting up at the working medium output of first evaporimeter for behind the heat of industry waste heat surpassing user's heating and power consumption demand, for example outside the heating cycle, can save the unnecessary heat of industry waste heat in heat-retaining subassembly with ground, so that use this heat when the heating peak, further improve the utilization ratio of industry waste heat.
(3) The communication pipeline is arranged between the working medium output end of the working medium pump and the working medium input end of the second evaporator, so that the working medium can conveniently utilize the heat stored by the ground heat storage assembly for heating.
(4) A circulation passage is arranged between the working medium output end of the second evaporator and the working medium input end of the expansion machine, so that after the heat absorbed by the carrier and the ground heat storage assembly exceeds the heating requirement, the working medium can be output by the first evaporator or the second evaporator and enters the expansion machine to generate electric energy.
(5) The working medium adopts carbon dioxide, so that the cost is low, and pollution is avoided.
Another objective of the present invention is to provide a method for secondary utilization of industrial waste heat, which comprises the following steps:
a. when the heat of the industrial waste heat meets the heat supply requirement, all the high-temperature working media output by the first heat exchanger flow into the condenser for supplying heat;
b. when the heat of the industrial waste heat exceeds the heat supply requirement, part of the high-temperature working medium output by the first heat exchanger flows into the condenser for supplying heat, and part of the working medium applies work to the expansion machine which drives the generator to generate electricity.
Further, the method also comprises the following steps:
when the heat supply amount of the industrial waste heat exceeds the sum of the heat supply demand and the electric quantity demand, part of the high-temperature working medium output by the first heat exchanger flows into the condenser for supplying heat; part of the working medium applies work to the expander, and the expander drives the generator to generate electricity; part of working medium flows through the ground heat storage assembly, and heat is stored in the ground heat storage assembly.
When the heat supply quantity of the industrial waste heat is not enough to meet the heat supply requirement, the working medium pump inputs low-temperature working medium to the ground heat storage assembly, and the low-temperature working medium enters the condenser after absorbing heat from the ground heat storage assembly and is used for supplying heat.
Further, the method also comprises the following steps:
when the heat supply of the industrial waste heat and the heat supply of the ground heat storage assembly exceed the heating requirement, the working medium absorbs heat from the carrier and the ground heat storage assembly, part of the working medium enters the expander to generate electric energy, and part of the working medium enters the condenser to supply heat.
The method for secondary utilization of industrial waste heat has the same beneficial effects as the industrial waste heat secondary utilization system, and is not repeated herein.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic diagram of an industrial waste heat secondary utilization system according to an embodiment of the present invention.
Description of reference numerals:
the system comprises a working medium pump 1, a first evaporator 2, a carrier input end 21, a carrier output end 22, an expansion machine 3, a first flow regulating valve 31, a generator 32, a condenser 4, a second flow regulating valve 41, a medium inflow end 42, a medium outflow end 43, a working medium tank 5, a ground heat storage assembly 6, a second heat exchanger 61, a third flow regulating valve 62, a geothermal exploitation well 63, a geothermal recharging well 64, a communication pipeline 65, a fourth flow regulating valve 66, a circulation pipeline 67 and a fifth flow regulating valve 68.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The embodiment relates to an industrial waste heat secondary utilization system, and as shown in fig. 1, the industrial waste heat secondary utilization system comprises a working medium pump 1 and a first evaporator 2 which are connected in series, and a carrier of industrial waste heat can transfer heat to a working medium in the first evaporator 2; the industrial waste heat secondary utilization system also comprises an expansion machine 3 connected with the working medium output end of the first evaporator 2, and a first flow regulating valve 31 is arranged between the expansion machine 3 and the first evaporator 2; the expander 3 is used for converting the internal energy of the high-temperature and high-pressure working medium output by the first evaporator 2 into mechanical energy, and is connected with the expander 3 and provided with a generator 32, and the generator 32 is used for converting the mechanical energy of the expander 3 into electric energy.
In addition, the industrial waste heat secondary utilization system also comprises a condenser 4, wherein the working medium input end of the condenser 4 is connected with the working medium output end of the expansion machine 3 and the working medium output end of the first evaporator 2, and a second flow regulating valve 41 is arranged between the condenser 4 and the first evaporator 2; the working medium output end of the condenser 4 is connected with the working medium input end of the working medium pump 1; a medium inflow end 42 for inflow of a heating medium and a medium outflow end 43 for outflow of the medium are provided on the condenser 4; the working medium with high temperature can transfer heat to the medium, and the medium can be used for heating of external users.
In a specific structure, referring to fig. 1, preferably, the industrial waste heat secondary utilization system further includes a working medium tank 5, the working medium tank 5 is used for storing a working medium, a working medium output end of the working medium tank 5 is connected with a working medium input end of the working medium pump 1, so that the working medium can enter the working medium pump 1 from the working medium tank 5, the working medium output end of the working medium pump 1 is connected with a working medium input end of the first evaporator 2, and the working medium can enter the first evaporator 2 after the working medium pump 1 is pressurized.
As described with reference to fig. 1, a carrier input 21 for the inflow of the carrier of the industrial waste heat and a carrier output 22 for the outflow of the carrier, for example, a liquid or a gas, are also provided on the first evaporator 2; the carrier flows into the first evaporator 2 from the carrier input end 21 and flows out from the carrier output end 22, heat can be transferred to the working medium, the low-temperature working medium absorbs the heat and then becomes the high-temperature high-pressure working medium, wherein the working medium preferably adopts CO2(carbon dioxide) working medium adopts CO2The cost is low, and the safety is good; it should be noted that, the specific structure of the first evaporator 2 and the operation principle thereof can refer to the prior art, and are not described herein again.
A condenser 4 is connected with the working medium output end of the first evaporator 2, the working medium output end of the condenser 4 is connected with the working medium input end of the working medium tank 5, and a second flow regulating valve 41 is arranged between the condenser 4 and the first evaporator 2; a medium inflow end 42 for inflow of a medium for heating and a medium outflow end 43 for outflow of the medium are provided on the condenser 4; the working medium with high temperature can transfer heat to the medium, and the medium can be used for heating of external users after absorbing the heat. It should be noted that, the specific structure and principle of the condenser 4, the medium for heating, and the principle of heating may also refer to the existing mature technology, and are not described herein again.
The temperature of the working medium after heat exchange with the medium is reduced, and the working medium flows into the working medium tank 5 again from the working medium output end of the condenser 4 to form a heat supply cycle.
On the basis, in the present embodiment, referring to fig. 1, the working medium output end of the first evaporator 2 is further connected with an expander 3, a first flow regulating valve 31 is connected in series between the expander 3 and the first evaporator 2, the working medium output end of the expander 3 is connected with the working medium input end of the condenser 4, and the first flow regulating valve 31 and the expander 3 are connected in series and then are connected in parallel with the second flow regulating valve 41; a generator 32 is connected to the expander 3. When the second flow regulating valve 41 is completely closed, the high-temperature working medium output by the first evaporator 2 enters the expander 3 to push the expander 3 to do work, the expander 3 pushes the generator 32 to do work again, the conversion from the internal energy of the high-temperature working medium to the mechanical energy of the expander 3 to the electric energy of the generator 32 is completed, the temperature of the working medium after the expander 3 is pushed to do work is reduced, the working medium enters the condenser 4 and then enters the working medium tank 5, and a power generation cycle is formed. It should be noted that the structure of the expander 3 and the connection structure thereof with the generator 32 can refer to the prior art, and are not described herein.
In this embodiment, the industrial waste heat secondary utilization system further includes a ground heat storage assembly 6, the ground heat storage assembly 6 is connected in parallel with the expansion machine 3 and is arranged at the working medium output end of the first evaporator 2, and a third flow regulating valve 62 is arranged between the ground heat storage assembly 6 and the first evaporator 2; the high-temperature working medium can transfer heat to the ground heat storage assembly 6, and the ground heat storage assembly 6 is used for storing heat.
In a specific structure, referring to fig. 1, the geothermal heat storage assembly 6 includes a second evaporator 61, a geothermal exploitation well 63, and a geothermal recharge well 64; a first pipeline for inputting and outputting the working medium is arranged on the second evaporator 61, and a second pipeline for circulating underground water between the geothermal exploitation well 63 and the geothermal recharge well 64 is arranged on the second evaporator 61 and is used for heat exchange between the working medium and the underground water.
More specifically, the working medium input end of the second evaporator 61 is connected with the working medium output end of the first evaporator 2, and the working medium output end of the second evaporator 61 is connected with the working medium input end of the condenser 4; the third flow regulating valve 62 is specifically arranged between the first evaporator 2 and the second evaporator 61, when the first flow regulating valve 31 and the second flow regulating valve 41 are completely closed, the high-temperature working medium output by the first evaporator 2 passes through the second evaporator 61, meanwhile, underground water is input into the second evaporator 61 from the geothermal exploitation well 63, after the heat exchange between the underground water and the working medium, the temperature of the working medium is reduced, the working medium enters the condenser 4 for condensation, and then the working medium flows back to the working medium tank 5; the temperature of the groundwater rises and returns to the geothermal recharging well 64, and the heat is stored underground, so that the heat storage cycle is completed.
Preferably, a communication pipeline 65 is arranged between the working medium output end of the second evaporator 61 and the working medium input end of the expander 3, and a fourth flow regulating valve 66 is arranged on the communication pipeline 65, so that the working medium can enter the expander 3 after exchanging heat with the underground water.
Preferably, a flow line 67 is provided between the working medium outlet of the working medium pump 1 and the working medium inlet of the second evaporator 61, and a fifth flow control valve 68 is provided on the flow line 67.
Based on the structure, the industrial waste heat secondary utilization system has the following use method:
the method specifically comprises the following steps:
a. when the heat of the industrial waste heat meets the heat supply requirement, all the working media flow into the condenser 4 for heat supply;
b. when the heat of the industrial waste heat exceeds the heat supply requirement, part of the working medium flows into the condenser 4 for heat supply, and part of the working medium applies work to the expander 3 to convert the internal energy of the working medium into electric energy.
Specifically speaking, the method comprises the following steps: when the heat of industrial waste heat just satisfies the heat supply demand, second flow control valve 41 opens, all the other flow control valves close, the low temperature working medium in working medium jar 5 gets into after working medium pump 1 pressurizes and gets into the carrier that gets into first evaporimeter 2 and industrial waste heat and carries out the heat exchange, the high temperature working medium after carrying out the heat exchange with the carrier gets into condenser 4, the working medium of high temperature transmits the heat to the heating medium, make heating medium temperature rise, can be used for outside user's heating, the working medium after the condensation gets into in working medium jar 5, accomplish the heat supply circulation.
When the heat of the industrial waste heat exceeds the heating requirement, the second flow regulating valve 41 and the first flow regulating valve 31 are opened, the other flow regulating valves are closed, the low-temperature working medium in the working medium tank 5 is pressurized by the working medium pump 1 and then enters the first evaporator 2 to exchange heat with the carrier of the industrial waste heat, the high-temperature working medium part after exchanging heat with the carrier enters the condenser 4, the high-temperature working medium transfers the heat to the heating medium in the condenser 4, so that the temperature of the heating medium is increased, the heating medium can be used for heating of external users, and the condensed working medium enters the working medium tank 5; the other part of the high-temperature working medium enters the expander 3 and pushes the engine to generate power, the temperature of the working medium after pushing the expander 3 to do work is reduced, then the working medium enters the condenser 4 to be condensed, and the condensed working medium enters the working medium tank 5; after the heat supply and power generation cycles are completed, it should be noted that the flow rates of the first flow regulating valve 31 and the second flow regulating valve 41 can be regulated according to the amount of the high-temperature working medium entering the condenser 4 or the expander 3, and the details are not described herein.
Preferably, the application method of the industrial waste heat secondary utilization system further comprises the following steps:
when the heat supply amount of the industrial waste heat exceeds the sum of the heat supply demand and the electric quantity demand, part of the working medium directly flows into the condenser 4 for supplying heat, part of the working medium applies work to the expansion machine 3 to convert the energy into electric energy, and part of the working medium stores the heat in the ground heat storage assembly 6 through the ground heat storage assembly 6.
When the heat of the industrial waste heat is not enough to meet the heat supply requirement, the working medium absorbs heat from the ground heat storage assembly 6 for heating.
Specifically speaking, the method comprises the following steps: when the heat supply amount of the industrial waste heat exceeds the sum of the heat supply demand and the electric quantity demand, the first flow regulating valve 31, the second flow regulating valve 41 and the third flow regulating valve 62 are opened, the rest flow regulating valves are closed, part of the high-temperature working medium output by the first evaporator 2 directly enters the condenser 4 for supplying heat for external users, part of the high-temperature working medium enters the expander 3 for generating power, and part of the high-temperature working medium stores heat underground through the ground heat storage assembly 6.
When the heat supply quantity of the industrial waste heat is not enough to meet the heating demand of the user, the second flow regulating valve 41 and the fourth flow regulating valve 66 are opened, the rest flow regulating valves are closed, part of low-temperature working medium output by the working medium pump 1 enters the first evaporator 2 to absorb the heat of the industrial waste heat carrier, part of the low-temperature working medium enters the second evaporator 61 to absorb the heat stored underground, and the industrial waste heat and the heat stored underground jointly supply heat for the user.
Preferably, the application method of the industrial waste heat secondary utilization system further comprises the following steps:
when the industrial waste heat and the heat supply of the ground heat storage assembly 6 exceed the heating requirement, the working medium absorbs heat from the carrier and the ground heat storage assembly 6, part of the working medium enters the expander 3 to generate electric energy, and part of the working medium directly enters the condenser 4 to supply heat.
Specifically speaking, the method comprises the following steps: when the heat supply of the industrial waste heat and the ground heat storage assembly 6 exceeds the heating demand, the third flow regulating valve 62 is closed, the rest flow regulating valves are opened, and after the working medium absorbs heat from the carrier of the industrial waste heat and the ground heat storage assembly 6, part of the working medium directly enters the condenser 4 for heating of a user, and part of the working medium enters the expander 3 for power generation.
In the industrial waste heat secondary utilization system of the embodiment, the expander 3 and the condenser 4 are arranged at the working medium output end of the first evaporator 2, so that the low-temperature working medium is input into the first evaporator 2 by the working medium pump 1, the carrier of the industrial waste heat transfers heat to the working medium, and then the high-temperature working medium can selectively and directly enter the condenser 4 and transfer the heat to the heat supply carrier for users to warm; when the heat of the industrial waste heat exceeds the heating requirement of a user, part of high-temperature working medium can directly enter the condenser 4 to normally heat the user, and the rest of the working medium can partially enter the expander 3 and push the expander 3 to do work, so that the heat of the industrial waste heat is converted into mechanical energy of the expander 3, and then the expander 3 does work on the generator 32 to convert the mechanical energy into electric energy; therefore, the heating requirement of a user is met, meanwhile, redundant heat is converted into electric energy, and the utilization rate of industrial waste heat is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides an industry waste heat reutilization system, is including working medium pump, the first evaporimeter of series connection, and the carrier of industry waste heat can with heat transfer to working medium in the first evaporimeter, its characterized in that, industry waste heat reutilization system still includes:
the expansion machine is connected with the working medium output end of the first evaporator, and a first flow regulating valve is arranged between the expansion machine and the first evaporator; the expander is used for converting the internal energy of the high-temperature and high-pressure working medium output by the first evaporator into mechanical energy, and is connected with a generator which is used for converting the mechanical energy of the expander into electric energy;
the working medium input end of the condenser is connected with the working medium output end of the expansion machine and the working medium output end of the first evaporator, and a second flow regulating valve is arranged between the condenser and the first evaporator; the working medium output end of the condenser is connected with the working medium input end of the working medium pump; a medium inflow end for enabling a heating medium to flow in and a medium outflow end for enabling the medium to flow out are arranged on the condenser; the working medium with high temperature can transfer heat to the medium, and the medium can be used for heating of external users.
2. The industrial waste heat secondary utilization system of claim 1, characterized in that: the device also comprises a ground heat storage assembly, the ground heat storage assembly and the expansion machine are connected in parallel and are arranged at a working medium output end of the first evaporator, and a third flow regulating valve is arranged between the ground heat storage assembly and the first evaporator; the high-temperature working medium can transfer heat to the geothermal heat storage assembly, and the geothermal heat storage assembly is used for storing the heat.
3. The industrial waste heat secondary utilization system of claim 2, characterized in that: the geothermal heat storage assembly comprises a second evaporator, a geothermal exploitation well and a geothermal recharge well; and a first pipeline for inputting and outputting the working medium is arranged on the second evaporator, and a second pipeline for circulating underground water between the geothermal exploitation well and the geothermal recharge well is arranged on the second evaporator so as to be used for heat exchange between the working medium and the underground water.
4. The industrial waste heat secondary utilization system of claim 3, characterized in that: a circulation pipeline is arranged between the working medium output end of the working medium pump and the working medium input end of the second evaporator, and a fourth flow regulating valve is arranged on the circulation pipeline.
5. The industrial waste heat secondary utilization system of claim 4, characterized in that: and a communicating pipeline is arranged between the working medium output end of the second evaporator and the working medium input end of the expansion machine, and a fifth flow regulating valve is arranged on the communicating pipeline.
6. The industrial waste heat secondary utilization system of claim 1, characterized in that: the carrier is a gas or a liquid.
7. The industrial waste heat secondary utilization system according to any one of claims 1 to 6, characterized in that: the working medium is carbon dioxide.
8. The method for recycling the industrial waste heat is characterized by comprising the following steps of:
a. when the heat of the industrial waste heat meets the heat supply requirement, all the high-temperature working media output by the first heat exchanger flow into the condenser for supplying heat;
b. when the heat of the industrial waste heat exceeds the heat supply requirement, part of the high-temperature working medium output by the first heat exchanger flows into the condenser for supplying heat, and part of the working medium applies work to the expansion machine which drives the generator to generate electricity.
9. The method for recycling industrial waste heat according to claim 8, further comprising the steps of:
when the heat supply amount of the industrial waste heat exceeds the sum of the heat supply demand and the electric quantity demand, part of the high-temperature working medium output by the first heat exchanger flows into the condenser for supplying heat; part of the working medium applies work to the expander, and the expander drives the generator to generate electricity; part of working medium flows through the ground heat storage assembly, and heat is stored in the ground heat storage assembly.
When the heat supply quantity of the industrial waste heat is not enough to meet the heat supply requirement, the working medium pump inputs low-temperature working medium to the ground heat storage assembly, and the low-temperature working medium enters the condenser after absorbing heat from the ground heat storage assembly and is used for supplying heat.
10. The method for recycling industrial waste heat according to claim 9, characterized in that: further comprising the steps of:
when the heat supply of the industrial waste heat and the heat supply of the ground heat storage assembly exceed the heating requirement, the working medium absorbs heat from the carrier and the ground heat storage assembly, part of the working medium enters the expander to generate electric energy, and part of the working medium enters the condenser to supply heat.
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