CN111306018A - Geothermal energy and biomass energy organic Rankine cycle combined heat and power system - Google Patents

Geothermal energy and biomass energy organic Rankine cycle combined heat and power system Download PDF

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Publication number
CN111306018A
CN111306018A CN202010259876.3A CN202010259876A CN111306018A CN 111306018 A CN111306018 A CN 111306018A CN 202010259876 A CN202010259876 A CN 202010259876A CN 111306018 A CN111306018 A CN 111306018A
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China
Prior art keywords
heat
pipeline
supply network
energy
rankine cycle
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Application number
CN202010259876.3A
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Chinese (zh)
Inventor
袁智威
李健
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Nanjing Tianheating Technology Co Ltd
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Nanjing Tianheating Technology Co Ltd
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Priority to CN202010259876.3A priority Critical patent/CN111306018A/en
Publication of CN111306018A publication Critical patent/CN111306018A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03GSPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
    • F03G7/00Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
    • F03G7/04Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using pressure differences or thermal differences occurring in nature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K17/00Using steam or condensate extracted or exhausted from steam engine plant
    • F01K17/02Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08Plants 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
    • F01K25/10Plants 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/06Arrangements of devices for treating smoke or fumes of coolers
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/10Geothermal energy
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/14Combined heat and power generation [CHP]

Abstract

The invention relates to a combined heat and power system for geothermal energy and biomass energy organic Rankine cycle, which comprises a Rankine cycle system consisting of a flash separator, a biomass boiler, a secondary preheater, an expander and a generator, wherein the inlet of the flash separator is connected with a production well, the outlet I of the flash separator is connected with a recharging well after passing through the secondary preheater, and the outlet II of the flash separator is connected with the recharging well; an exhaust port of the expansion machine is connected with an inlet of the biomass boiler after passing through the secondary preheater; the outlet of the biomass boiler is connected with the inlet of the expansion machine; the expander is connected with the generator. The invention can improve the inlet temperature of the expander and improve the power generation efficiency. Meanwhile, the cold end loss of the expansion machine can be eliminated, and the energy utilization rate is improved.

Description

Geothermal energy and biomass energy organic Rankine cycle combined heat and power system
Technical Field
The invention relates to a heat energy device, in particular to an improved organic Rankine cycle thermoelectric system, and specifically relates to a geothermal energy and biomass energy organic Rankine cycle combined heat and power system.
Background
The renewable energy mainly comprises wind energy, solar energy, hydroenergy, biomass energy, geothermal energy and other energy sources. With the depletion of fossil fuels, the vigorous development of renewable energy sources is an urgent requirement at present, and the reasonable development and utilization of geothermal energy and biomass energy are increasingly regarded by the nation and the industry.
The geothermal energy is one of renewable energy sources, has the characteristics of large reserves, low carbon, cleanness and the like, can not be influenced by the sunny days and the nights, and stably and continuously provides heat. The heat of rocks and underground water within five kilometers below the earth land can meet the energy requirement of mankind for tens of thousands of years according to the consumption of 100 hundred million tons of standard coal all over the world.
At present, the conventional geothermal energy power generation system generally has the problem that the temperature of an inlet of an expander is not high, so that the power generation efficiency of the system is low. And the exhaust of the expander directly passes through the condenser to release heat, so that the loss of the cold end is large, and the comprehensive energy utilization efficiency of the geothermal energy power generation system is low. Therefore, improvements are urgently needed.
Disclosure of Invention
The invention aims to provide a combined heat and power system of geothermal energy and biomass energy organic Rankine cycle, which can improve the inlet temperature of an expander and improve the power generation efficiency aiming at the defects of the prior art. Meanwhile, the cold end loss of the expansion machine can be eliminated, and the energy utilization rate is improved.
The technical scheme of the invention is as follows:
a combined heat and power system for geothermal energy and biomass energy organic Rankine cycle comprises an organic Rankine cycle system consisting of a flash separator, a biomass boiler, a secondary preheater, an expander and a generator, wherein an inlet of the flash separator is connected with a production well, an outlet I of the flash separator is connected with a recharging well after passing through a first pipeline of the secondary preheater, and an outlet II of the flash separator is connected with the recharging well; an exhaust port of the expansion machine is connected with an inlet of the biomass boiler after passing through a second pipeline of the secondary preheater; the outlet of the biomass boiler is connected with the inlet of the expansion machine; the expander is connected with the generator.
And further, the system also comprises a primary preheater, wherein a first pipeline of the primary preheater is connected between an outlet II of the flash separator and the recharging well in series, and a second pipeline of the primary preheater is connected between an exhaust port of the expansion machine and the secondary heat exchanger in series.
Further, the system also comprises a heat supply network heat exchanger and a heat supply network heat compensator; the second pipeline of the heat supply network heat exchanger is connected with the second pipeline of the heat supply network heat compensator in series and then is connected with a heat user, and a circulation loop is formed; a first pipeline of the heat supply network heat exchanger is connected in series between the exhaust port of the expander and the primary preheater; the inlet of a first pipeline of the heat supply network heat compensator is connected with the smoke port of the biomass boiler, and the outlet of the pipeline is emptied.
Furthermore, a hot water pump is arranged between the heat supply network heat exchanger and a heat user.
Furthermore, a working medium pump is arranged between the primary preheater and the heat supply network heat exchanger
The invention has the beneficial effects that:
1. the biomass boiler is used for supplementing heat to the organic working medium, so that the power generation efficiency of the system is improved;
2. the exhaust waste heat of the expansion machine is used for supplying heat, and no cold end loss exists;
3. the waste heat of the flue gas of the biomass boiler is recovered, and the hot water at the outlet of the heat supply network heat exchanger is further heated so as to meet the heat supply requirement;
4. the system not only has high comprehensive energy utilization rate, but also meets the heat and electricity diversified energy requirements of users.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Wherein: 1-a production well; 2-a flash separator; 3-a biomass boiler; 4-a secondary preheater; 5-primary preheater; 6-working medium pump; 7-an expander; 8-a generator; 9-heat supply network heat exchanger; 10-heat supply network heat compensator; 11-a hot water pump; 12-hot user; 13-recharging the well. The arrows in the figure are the flow direction of the medium, the flue gas or the hot water.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1.
A combined heat and power system of geothermal energy and biomass energy organic Rankine cycle comprises a production well 1, a flash separator 2, a biomass boiler 3, a secondary preheater 4, a primary preheater 5, an expansion machine 7, a generator 8, a heat supply network heat exchanger 9, a heat supply network heat compensator 10, a heat user 12 and a recharge well 13.
The inlet of the flash separator 2 is connected with the production well 1, the outlet I of the flash separator is connected with the recharging well 13 after passing through the secondary preheater 4, and the outlet II of the flash separator is connected with the recharging well 13 after passing through the primary preheater 5, so that a geothermal energy system is formed. The flash separator 2 can adopt an SZ-2 type medium temperature flash separator.
An exhaust port of the expansion machine 7 is connected to an inlet of the expansion machine 7 after passing through a first pipeline of the heat supply network heat exchanger 9, the working medium pump 6, a second pipeline of the primary heat exchanger 5, a second pipeline of the secondary preheater 4 and the biomass boiler 3, so that an organic Rankine cycle system is formed. The outlet of the biomass boiler 3 is connected to the inlet of said expander 7. The organic working medium in the organic Rankine cycle system can be selected from R134a, R245fa and the like. The biomass boiler 3 can adopt an SZL type double-drum biomass steam boiler as a heat supplementing device. The first-stage preheater 5 and the second-stage preheater 4 can both adopt BEM type one-way shell head-sealed tube box type heat exchangers.
And the second pipeline of the heat supply network heat exchanger 9 and the second pipeline of the heat supply network heat compensator 10 are connected in series and then are connected to a heat user 12, and then are connected to the second pipeline of the heat supply network heat exchanger 9 through a hot water pump 11 to form a heat supply system. Meanwhile, the flue gas port of the biomass boiler 3 is also connected with the first pipeline of the heat supply network heat compensator 10 and then is emptied, so that heat recovery is obtained in the flue gas emission process, and the energy utilization rate is improved. The heat supply network heat exchanger 9 and the heat supply network heat compensator 10 can both adopt a BIU-shaped end socket tube box U-shaped tubular heat exchanger.
The working process of the invention is as follows:
geothermal steam-water mixture from the production well passes through a flash separator to generate geothermal flash steam and geothermal condensate, wherein the geothermal condensate is discharged from an outlet II to provide heat for a primary preheater. Geothermal flash steam is discharged from an outlet I to provide heat for the secondary preheater. And after recovering heat, the geothermal flash steam and the geothermal condensate enter a recharging well to realize cyclic utilization.
In the organic Rankine cycle system, organic working medium liquid is heated into gas with higher temperature after sequentially passing through a primary preheater, a secondary preheater and a biomass boiler, an expander is pushed to do work, and then the expander drives a generator to generate power. And the organic working medium gas which does work is discharged from the expansion machine, enters the heat supply network heat exchanger to be cooled into liquid, and enters the working medium pump to complete the whole organic Rankine cycle. The biomass boiler performs heat supplement on the organic working medium discharged from the secondary preheater through combustion of animal wastes, crop wastes, wood and solid wastes, so that the temperature of the organic working medium at the inlet end of the expansion machine is increased, and the power generation efficiency is improved.
And the exhaust gas of the expansion machine enters a heat supply network heat exchanger to preheat hot water in a heat supply network system. Meanwhile, the flue gas of the biomass boiler enters a heat supply network heat compensator to heat hot water into high-temperature hot water, so that the heat supply requirement is met, and heat is supplied to a heat user.
The parts not involved in the present invention are the same as or can be implemented using the prior art.

Claims (5)

1. The combined heat and power system for the geothermal energy and biomass energy organic Rankine cycle comprises an organic Rankine cycle system consisting of a flash separator, a biomass boiler, a secondary preheater, an expander and a generator, and is characterized in that: the inlet of the flash separator is connected with the production well, the outlet I of the flash separator is connected with the recharging well after passing through the first pipeline of the secondary preheater, and the outlet II of the flash separator is connected with the recharging well; an exhaust port of the expansion machine is connected with an inlet of the biomass boiler after passing through a second pipeline of the secondary preheater; the outlet of the biomass boiler is connected with the inlet of the expansion machine; the expander is connected with the generator.
2. The cogeneration system of geothermal energy and biomass energy organic rankine cycle of claim 1, wherein: the system also comprises a primary preheater, wherein a first pipeline of the primary preheater is connected in series between the outlet II of the flash separator and the recharging well, and a second pipeline of the primary preheater is connected in series between the exhaust port of the expander and the secondary heat exchanger.
3. The cogeneration system of geothermal energy and biomass energy organic rankine cycle of claim 2, wherein: the heat supply network heat exchanger and the heat supply network heat compensator are also included; the second pipeline of the heat supply network heat exchanger is connected with the second pipeline of the heat supply network heat compensator in series and then is connected with a heat user, and a circulation loop is formed; a first pipeline of the heat supply network heat exchanger is connected in series between the exhaust port of the expander and the primary preheater; the inlet of a first pipeline of the heat supply network heat compensator is connected with the smoke port of the biomass boiler, and the outlet of the pipeline is emptied.
4. The cogeneration system of geothermal energy and biomass energy organic rankine cycle of claim 2, wherein: and a hot water pump is arranged between the heat supply network heat exchanger and a heat user.
5. The cogeneration system of geothermal energy and biomass energy organic rankine cycle of claim 2, wherein: and a working medium pump is arranged between the primary preheater and the heat supply network heat exchanger.
CN202010259876.3A 2020-04-03 2020-04-03 Geothermal energy and biomass energy organic Rankine cycle combined heat and power system Withdrawn CN111306018A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI761221B (en) * 2021-05-28 2022-04-11 張楨驩 Geothermal power generation thermal adjustment pool organic Rankine cycle system
NO20211257A1 (en) * 2021-10-19 2023-04-20 Arvid Nesheim Installations for the production of electricity and cooling of surroundings

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI761221B (en) * 2021-05-28 2022-04-11 張楨驩 Geothermal power generation thermal adjustment pool organic Rankine cycle system
NO20211257A1 (en) * 2021-10-19 2023-04-20 Arvid Nesheim Installations for the production of electricity and cooling of surroundings

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Application publication date: 20200619