CN109114580B - Waste heat recovery device - Google Patents
Waste heat recovery device Download PDFInfo
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- CN109114580B CN109114580B CN201710495440.2A CN201710495440A CN109114580B CN 109114580 B CN109114580 B CN 109114580B CN 201710495440 A CN201710495440 A CN 201710495440A CN 109114580 B CN109114580 B CN 109114580B
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- heat
- flue gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
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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
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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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
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
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- Thermal Sciences (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
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Abstract
The invention discloses a waste heat recovery device which comprises a heat-conducting oil flue gas heat exchanger, a heat-conducting oil pump, a heat-conducting oil crude oil heat exchanger, a heat-conducting oil injection system, a steam-water heat exchanger and a heat pump. The waste heat recovery device comprises a two-stage heat exchange system: the high-temperature flue gas heat exchange system comprises a heat-conducting oil flue gas heat exchanger, a heat-conducting oil pump, a heat-conducting oil crude oil heat exchanger and a heat-conducting oil injection system, and the low-temperature flue gas heat exchange system comprises a steam-water heat exchanger and a heat pump, wherein the high-temperature flue gas heat exchange system realizes the utilization of waste heat of high-temperature flue gas and can heat low-temperature crude oil, the low-temperature flue gas heat exchange system realizes the utilization of waste heat of medium-temperature and low-temperature flue gas, can heat production or domestic wastewater, and provides. Through the two-stage heat exchange system, the waste heat resource of the flue gas can be absorbed to the maximum extent, and the aims of heating the crude oil at high temperature and providing water for platform production and living are fulfilled.
Description
Technical Field
The invention relates to the technical field of heat energy development and utilization, in particular to a waste heat recovery device.
Background
The gas turbine is used as the most common main power station form of an ocean platform and provides electric energy for a main power station system, an oil gas treatment system, a public system and the like. The discharged flue gas becomes the waste heat resource with the highest grade and the largest waste heat quantity of the ocean platform. According to research, at present, the utilization of the waste heat of the offshore platform mainly comprises the modes of recovering the exhaust waste heat of a gas turbine by a heat conduction oil system, absorbing the smoke waste heat by a lithium bromide absorption type air conditioning unit and the like. The technologies only carry out primary utilization on the high-temperature flue gas, the utilization rate is low, great resource waste is caused, and the outside flue gas still has a large energy utilization space. Therefore, an offshore platform waste heat utilization system with higher utilization efficiency is desired.
Disclosure of Invention
The invention aims to provide a waste heat recovery device which can carry out gradient utilization on flue gas with different temperatures, so that the waste heat resource of the flue gas of a gas turbine can be absorbed to the maximum extent.
The invention adopts the following solution: a waste heat recovery device comprises a heat-conducting oil flue gas heat exchanger, a heat-conducting oil pump, a heat-conducting oil crude oil heat exchanger, a heat-conducting oil injection system, a steam-water heat exchanger and a heat pump;
the heat-conducting oil gas-gas heat exchanger is provided with a first gas inlet, a first gas outlet, a first heat-conducting oil inlet and a first heat-conducting oil outlet, the heat-conducting oil crude oil heat exchanger is provided with a low-temperature crude oil inlet, a high-temperature crude oil outlet, a second heat-conducting oil inlet and a second heat-conducting oil outlet, the steam-water heat exchanger is provided with a second gas inlet, a second gas outlet, a first medium inlet and a first medium outlet, and the heat pump is provided with an evaporator inlet, an evaporator outlet, a condenser inlet and a condenser outlet;
a first flue gas outlet of the heat-conducting oil flue gas heat exchanger is connected to a second flue gas inlet of the steam-water heat exchanger, a first heat-conducting oil inlet is connected to an outlet of the heat-conducting oil pump, and a first heat-conducting oil outlet is connected to a second heat-conducting oil inlet of the heat-conducting oil crude oil heat exchanger;
a second heat conduction oil outlet of the heat conduction oil crude oil heat exchanger is connected to an inlet of the heat conduction oil pump, and the heat conduction oil injection system is connected to a pipeline between the second heat conduction oil outlet and the inlet of the heat conduction oil pump and used for storing and injecting heat conduction oil into the heat conduction oil pump;
and a first medium inlet of the steam-water heat exchanger is connected to an evaporator outlet of the heat pump, and a first medium outlet is connected to an evaporator inlet of the heat pump.
Preferably, the first flue gas inlet is for connection to a flue gas outlet of a gas turbine.
Preferably, the gas turbine comprises an air compressor, a combustor and a gas turbine connected in sequence.
Preferably, a flue gas outlet of the gas turbine is connected to a second flue gas inlet of the steam-water heat exchanger.
Preferably, a control valve is arranged between the flue gas outlet of the gas turbine and the second flue gas inlet of the steam-water heat exchanger.
Preferably, the low temperature crude oil inlet of the diathermic oil crude oil heat exchanger is used for connecting to a low temperature crude oil pipeline.
Preferably, the condenser inlet of the heat pump is for connection to a waste water line.
Preferably, the condenser outlet of the heat pump is for connection to a water line.
Preferably, a control valve is arranged between the conduction oil injection system and an inlet of the conduction oil pump.
Compared with the prior art, the invention has the beneficial effects that: including two-stage heat transfer system, high temperature flue gas heat transfer system realizes the waste heat utilization to the high temperature flue gas, can heat low temperature crude oil, and low temperature flue gas heat transfer system realizes the waste heat utilization of well low temperature flue gas, can heat production or domestic waste water, provides production and life hot water for the platform. Through the two-stage heat exchange system, the waste heat resource of the flue gas can be absorbed to the maximum extent, and the aims of heating the crude oil at high temperature and providing water for platform production and living are fulfilled.
The method and apparatus of the present invention have other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following detailed description, which are incorporated herein, and which together serve to explain certain principles of the invention.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
Fig. 1 shows a schematic diagram of a waste heat recovery device according to an embodiment of the invention.
Description of reference numerals:
1-heat conducting oil flue gas heat exchanger, 1 a-first flue gas inlet, 1 b-first flue gas outlet, 1 c-first heat conducting oil inlet, 1 d-first heat conducting oil outlet, 2-heat conducting oil pump, 3-heat conducting oil crude oil heat exchanger, 3 a-low temperature crude oil inlet, 3 b-high temperature crude oil outlet, 3 c-second heat conducting oil inlet, 3 d-second heat conducting oil outlet, 4-heat conducting oil injection system, 5-steam-water heat exchanger, 5 a-second flue gas inlet, 5 b-second flue gas outlet, 5 c-first medium inlet, 5 d-first medium outlet, 6-heat pump, 6 a-evaporator inlet, 6 b-evaporator outlet, 6 c-condenser inlet, 6 d-condenser outlet, 7-air compressor, 8-combustion chamber, 9-gas turbine.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Fig. 1 shows a waste heat recovery device according to an embodiment of the present invention, which includes a heat transfer oil flue gas heat exchanger 1, a heat transfer oil pump 2, a heat transfer oil crude oil heat exchanger 3, a heat transfer oil injection system 4, a steam-water heat exchanger 5, and a heat pump 6;
the heat-conducting oil gas heat exchanger 1 is provided with a first gas inlet 1a, a first gas outlet 1b, a first heat-conducting oil inlet 1c and a first heat-conducting oil outlet 1d, the heat-conducting oil crude oil heat exchanger 3 is provided with a low-temperature crude oil inlet 3a, a high-temperature crude oil outlet 3b, a second heat-conducting oil inlet 3c and a second heat-conducting oil outlet 3d, the steam-water heat exchanger 5 is provided with a second gas inlet 5a, a second gas outlet 5b, a first medium inlet 5c and a first medium outlet 5d, and the heat pump 6 is provided with an evaporator inlet 6a, an evaporator outlet 6b, a condenser inlet 6c and a condenser outlet 6 d;
a first flue gas outlet 1b of the heat-conducting oil flue gas heat exchanger 1 is connected to a second flue gas inlet 5a of the steam-water heat exchanger 5, a first heat-conducting oil inlet 1c is connected to an outlet of the heat-conducting oil pump 2, and a first heat-conducting oil outlet 1d is connected to a second heat-conducting oil inlet 3c of the heat-conducting oil crude oil heat exchanger 3;
a second heat conduction oil outlet 3d of the heat conduction oil crude oil heat exchanger 3 is connected to an inlet of the heat conduction oil pump 2, and a heat conduction oil injection system 4 is connected to a pipeline between the second heat conduction oil outlet 3d and the inlet of the heat conduction oil pump 2 and is used for storing and injecting heat conduction oil into the heat conduction oil pump 2;
the first medium inlet 5c of the steam-water heat exchanger 5 is connected to the evaporator outlet 6b of the heat pump 6, and the first medium outlet 5d is connected to the evaporator inlet 6a of the heat pump.
When the waste heat recovery device works, high-temperature flue gas enters the heat-conducting oil flue gas heat exchanger 1 through the first flue gas inlet 1a, heat-conducting oil is injected into the heat-conducting oil pump 2 through the heat-conducting oil injection system 4, the heat-conducting oil is pressurized by the heat-conducting oil pump 2 and then enters the heat-conducting oil flue gas heat exchanger 1 through the first heat-conducting oil inlet 1c, and heat exchange is carried out between the heat-conducting oil flue gas and the high-temperature flue gas, so that heat of the high-temperature. The heated heat conduction oil flows out through the first heat conduction oil outlet 1d and enters the heat conduction oil crude oil heat exchanger 3 through the second heat conduction oil inlet 3c, the temperature of the high-temperature flue gas is reduced after the heat exchange of the heat conduction oil flue gas heat exchanger 1, the high-temperature flue gas is changed into medium-low temperature flue gas, and the medium-low temperature flue gas flows out through the first flue gas outlet 1b and enters the steam-water heat exchanger 5 through the second flue gas inlet 5 a.
The low-temperature crude oil enters the heat-conducting oil crude oil heat exchanger 3 through the low-temperature crude oil inlet 3a of the heat-conducting oil crude oil heat exchanger 3, and exchanges heat with the heated heat-conducting oil, so that the recycling of the high-temperature flue gas waste heat is realized. Become high temperature crude oil after low temperature crude oil absorbs the heat, flow through high temperature crude oil export 3b, after the heat of conduction oil was absorbed, the temperature reduced, flow through second conduction oil export 3d to the entry through conduction oil pump 2 returns conduction oil pump 2 again, continues to recycle.
The medium-low temperature flue gas enters the steam-water heat exchanger 5 through the second flue gas inlet 5a, and exchanges heat with the cold medium entering through the first medium inlet 5c, and the heat is further recovered. In the embodiment, the cold medium is water, the water is directly sprayed to the surface of the medium-low temperature flue gas to exchange heat with the medium-low temperature flue gas, the temperature of the medium-low temperature flue gas is further reduced, the medium-low temperature flue gas is discharged as waste gas through the second flue gas outlet 5b, the water serving as the cold medium is heated to become water vapor, the water vapor flows out through the first medium outlet 5d, and the water vapor flows into the heat pump 6 through the evaporator inlet 6a of the heat pump 6.
The production or domestic wastewater enters the heat pump 6 through the condenser inlet 6c of the heat pump 6, is heated by heat brought by water vapor, flows out of the heated wastewater through the condenser outlet 6d and is used as production or domestic water, and flows out of the evaporator outlet 6b after the water vapor is cooled and enters the steam-water heat exchanger 5 through the first medium inlet 5c again.
The waste heat recovery device provided by the embodiment of the invention comprises a two-stage heat exchange system: namely a high-temperature flue gas heat exchange system comprising a heat-conducting oil flue gas heat exchanger 1, a heat-conducting oil pump 2, a heat-conducting oil crude oil heat exchanger 3 and a heat-conducting oil injection system 4, and a low-temperature flue gas heat exchange system comprising a steam-water heat exchanger 5 and a heat pump 6. The high-temperature flue gas heat exchange system realizes the utilization of waste heat of high-temperature flue gas, can heat low-temperature crude oil, and the low-temperature flue gas heat exchange system realizes the utilization of waste heat of medium-temperature and low-temperature flue gas, can heat production or domestic wastewater, and provides production and domestic hot water for the platform. Through the two-stage heat exchange system, the waste heat resource of the flue gas can be absorbed to the maximum extent, and the aims of heating the crude oil at high temperature and providing water for platform production and living are fulfilled.
In one example, the first flue gas inlet 1a is for connection to a flue gas outlet of a gas turbine. The gas turbine comprises an air compressor, a combustion chamber and a gas turbine which are sequentially connected, wherein air is compressed by the air compressor and then enters the combustion chamber, and the air and fuel are fully mixed and then combusted in the combustion chamber to generate high-temperature and high-pressure flue gas to push the gas turbine to do work. The flue gas outlet of the gas turbine discharges high-temperature flue gas, and the high-temperature flue gas enters the heat-conducting oil flue gas heat exchanger 1 through the first flue gas inlet 1 a.
In one example, a flue gas outlet of the gas turbine is connected to the second flue gas inlet 5a of the steam-water heat exchanger 5, and a control valve is arranged between the flue gas outlet of the gas turbine and the second flue gas inlet 5a of the steam-water heat exchanger 5, so that the amount of high-temperature flue gas entering the steam-water heat exchanger 5 can be controlled. Through the arrangement, the heating of crude oil is ensured, and simultaneously, redundant high-temperature flue gas can directly enter the steam-water heat exchanger, so that the heat of the flue gas is fully utilized.
In one example, the low temperature crude oil inlet 3a of the diathermic crude oil heat exchanger 3 is used to connect to a low temperature crude oil line so that low temperature crude oil can enter the diathermic crude oil heat exchanger 3 through the low temperature crude oil inlet 3 a.
In one example, the condenser inlet 6c of the heat pump 6 is for connection to a waste water line, such that production or domestic waste water may enter the heat pump 6 through the condenser inlet 6 c.
In one example, the condenser outlet 6d of the heat pump 6 is adapted to be connected to a water line, so that the hot water produced by the heat pump 6 can be supplied as production or domestic water.
In one example, a control valve is provided between the thermal oil injection system 4 and the inlet of the thermal oil pump 2, and injection of thermal oil can be controlled.
Examples
The waste heat recovery device shown in fig. 1 is used for carrying out waste heat recovery on high-temperature flue gas exhausted by 1 gas turbine generator set, the air input of the gas turbine generator set is 85t/h, and the temperature of the high-temperature flue gas is 480 ℃.
After the high-temperature flue gas exchanges heat through the heat-conducting oil flue gas heat exchanger 1, the temperature is reduced to 180 ℃, and the recovered waste heat is Q1＝G1×C1×△t1＝85000×1.019×(480-180)＝2.6×107KJ/h. Wherein G is1Indicates the amount of intake air, C1Denotes the specific heat capacity of the flue gas,. DELTA.t1Indicating the temperature difference of the flue gas. Calculated by the heat exchanger efficiency of 95 percent, the maximum heating power which can be provided is 2.6 multiplied by 107×0.95×0.95＝2.3×107KJ/h＝6388KW。
The amount of crude oil required to be heated per day is 10000t, i.e. 4.17X 10 per hour5kg, crude oil from 48 DEG CHeating to 65 deg.C with the required heat of Q2＝G2×C2×△t2＝4.17×105×2.05×(65-48)＝1.45×107kJ/h. Wherein G is2Indicating the quantity of crude oil to be heated, C2Denotes the specific heat capacity,. DELTA.t, of the crude oil2Indicating the temperature difference of the crude oil.
Considering the efficiency of the high-temperature heat exchange system, the amount of waste heat entering the low-temperature heat exchange system is 1 multiplied by 107KJ/h, maximum heating power 2500 KW. The production water load of the platform user is 870KW, and the requirement can be met.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (4)
1. A waste heat recovery device comprises a heat-conducting oil flue gas heat exchanger (1), a heat-conducting oil pump (2), a heat-conducting oil crude oil heat exchanger (3), a heat-conducting oil injection system (4), a steam-water heat exchanger (5) and a heat pump (6);
the heat-conducting oil gas heat exchanger (1) is provided with a first gas inlet (1a), a first gas outlet (1b), a first heat-conducting oil inlet (1c) and a first heat-conducting oil outlet (1d), the heat-conducting oil crude oil heat exchanger (3) is provided with a low-temperature crude oil inlet (3a), a high-temperature crude oil outlet (3b), a second heat-conducting oil inlet (3c) and a second heat-conducting oil outlet (3d), the steam-water heat exchanger (5) is provided with a second gas inlet (5a), a second gas outlet (5b), a first medium inlet (5c) and a first medium outlet (5d), and the heat pump (6) is provided with an evaporator inlet (6a), an evaporator outlet (6b), a condenser inlet (6c) and a condenser outlet (6 d);
a first flue gas outlet (1b) of the heat-conducting oil flue gas heat exchanger (1) is connected to a second flue gas inlet (5a) of the steam-water heat exchanger (5), a first heat-conducting oil inlet (1c) is connected to an outlet of the heat-conducting oil pump (2), and a first heat-conducting oil outlet (1d) is connected to a second heat-conducting oil inlet (3c) of the heat-conducting oil crude oil heat exchanger (3);
a second heat conduction oil outlet (3d) of the heat conduction oil crude oil heat exchanger (3) is connected to an inlet of the heat conduction oil pump (2), and the heat conduction oil injection system (4) is connected to a pipeline between the second heat conduction oil outlet (3d) and the inlet of the heat conduction oil pump (2) and is used for storing and injecting heat conduction oil into the heat conduction oil pump (-2);
a first medium inlet (5c) of the steam-water heat exchanger (5) is connected to an evaporator outlet (6b) of the heat pump (6), and a first medium outlet (5d) is connected to an evaporator inlet (6a) of the heat pump (6);
the first flue gas inlet (1a) is used for connecting to a flue gas outlet of a gas turbine;
the flue gas outlet of the gas turbine is connected to a second flue gas inlet (5a) of the steam-water heat exchanger (5);
a control valve is arranged between the flue gas outlet of the gas turbine and the second flue gas inlet (5a) of the steam-water heat exchanger (5);
a condenser inlet (6c) of the heat pump (6) for connection to a waste water line;
the condenser outlet (6d) of the heat pump (6) is intended to be connected to a water line.
2. The waste heat recovery device according to claim 1, wherein the gas turbine comprises an air compressor (7), a combustion chamber (8) and a gas turbine (9) connected in sequence.
3. The waste heat recovery device according to claim 1, wherein the low temperature crude oil inlet (3a) of the diathermic oil heat exchanger (3) is for connection to a low temperature crude oil pipeline.
4. The waste heat recovery device according to claim 1, wherein a control valve is arranged between the heat transfer oil injection system (4) and the inlet of the heat transfer oil pump (2).
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| CN201710495440.2A CN109114580B (en) | 2017-06-26 | 2017-06-26 | Waste heat recovery device |
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| CN201710495440.2A CN109114580B (en) | 2017-06-26 | 2017-06-26 | Waste heat recovery device |
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| CN201652799U (en) * | 2010-02-09 | 2010-11-24 | 上海益格新技术工程有限公司 | Afterheat recycling and heating device of heat carrier oil |
| JP2014008449A (en) * | 2012-06-29 | 2014-01-20 | Babcock-Hitachi Co Ltd | Exhaust gas treatment device and method |
| CN104251553B (en) * | 2013-06-28 | 2017-05-24 | 中能纪（北京）国际科技有限公司 | Crude oil gathering and transportation heating furnace tail gas waste heat recycle and emission reduction device |
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