CN101586513B - Method and device for recycling waste heat in discharged smoke of marsh gas power generation - Google Patents

Method and device for recycling waste heat in discharged smoke of marsh gas power generation Download PDF

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Publication number
CN101586513B
CN101586513B CN2009100760352A CN200910076035A CN101586513B CN 101586513 B CN101586513 B CN 101586513B CN 2009100760352 A CN2009100760352 A CN 2009100760352A CN 200910076035 A CN200910076035 A CN 200910076035A CN 101586513 B CN101586513 B CN 101586513B
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China
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marsh gas
power generation
heat
waste heat
condenser
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CN2009100760352A
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Chinese (zh)
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CN101586513A (en
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贠小银
李和平
宿建峰
邱河梅
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中国华电工程(集团)有限公司
北京中光电力设备公司
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    • 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
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00Climate change mitigation technologies for sector-wide applications
    • Y02P80/10Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y02P80/15On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
    • 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
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/12Improving ICE efficiencies

Abstract

The present invention discloses a method and a device for recycling the waste heat in the discharged smoke of marsh gas power generation. According to the method of the invention, the discharged smokeafter power generation of a marsh gas internal combustion engine (3) enters a waste heat boiler (4) for heat exchanging with the water, and the smoke after temperature reduction is discharged; the st eam generated after heat absorption of the water enter a screw bolt expansion power machine (6) and a generator (7) for expanding, work applying and power generating, the discharged steam enters a condenser (8), and the condensed water enter the waste heat boiler (4) for recycling. Compared with the prior art, the invention uses the waste heat of the discharged smoke after marsh gas power generation for generating the steam. Then the steam enters a low-grade heat energy power machine-screw bolt expansion power machine for expanding, work applying and power generating. The low-grade heat is directly converted to the electric energy. The generated electric power can be combined with the electric power generated by the marsh gas internal combustion engine and sent to the electric network. Themethod and the device of the invention have the advantages of easy implement, strong operability and no effect by the position of the marsh gas power generating plant. The heat can be directly conver ted to the electric power and transmitted to the outside. The limitation of waste gas utilization mode of traditional smoke discharging is overcome.

Description

Recycle the method and apparatus of waste heat in discharged smoke of marsh gas power generation
Technical field:
The present invention relates to a kind of method and apparatus of recycling waste heat in discharged smoke of marsh gas power generation, belong to the biomass energy utilization technologies field.
Background technique:
Marsh gas power generation mainly is divided into three parts, and the one, the system natural pond, the 2nd, utilize the generating of biogas internal combustion engine group, the 3rd, the UTILIZATION OF VESIDUAL HEAT IN of internal-combustion engine.The UTILIZATION OF VESIDUAL HEAT IN of biogas generator is divided into two-part again, and the one, the UTILIZATION OF VESIDUAL HEAT IN of smoke evacuation, the 2nd, the utilization of generator self cooling heat.Owing to be subjected to the restriction of generator set self, wherein, generator self cooling heat mainly is to produce about 80 ℃ hot water.Generally about 450 ℃~500 ℃, the utilization of this part smoke discharging residual heat mainly contains three kinds of modes to the temperature of exhaust fume of generator:
(1) hot-water type.Utilize the waste heat of generator can produce the hot water of 90 ℃ even higher temperature.This form can be used at the northern area of needs heating.
(2) flue gas type.Utilize the waste heat of flue gas to cooperate the absorption refrigeration unit, cold source load can be provided.
(3) steam type.Utilize the waste heat of flue gas can produce saturated vapour or superheated vapor, but the capacity of marsh gas power generation unit is generally less, the output of steam is less.For example, the marsh gas power generation unit of a 1MW can produce 0.6MPa, the saturated vapour of 1t/h.If the generation superheated vapor, just the output of steam is less than 1t/h.Obviously, the generating of the steam of this small flow drive steam turbine is unaccommodated.
At present, China intensive culture factory generally build more remote place, rural area in, does not have heat, vapour user around the plant, and the low-temperature receiver user is also considerably less, marsh gas power generation factory generally all build in plant near.Therefore, above-mentioned three kinds of modes that reclaim waste heat in discharged smoke of marsh gas power generation are not best UTILIZATION OF VESIDUAL HEAT IN mode.
Summary of the invention:
The objective of the invention is to: a kind of method and apparatus of recycling waste heat in discharged smoke of marsh gas power generation is provided.The present invention utilizes the smoke discharging residual heat of biogas internal-combustion engine to produce steam, enters screw expansion motor expansion acting generating then, and the electric power that is produced can merge online with biogas internal-combustion engine electricity power.
The present invention is achieved in that a kind of method of recycling waste heat in discharged smoke of marsh gas power generation is: the smoke evacuation after the generating of biogas internal-combustion engine enters exhaust heat boiler, carries out heat exchange with water, and the flue gas after the cooling is discharged; The steam that water heat absorption back produces enters the acting generating of expanding of screw expansion motor and generator, and steam discharge enters condenser, and condensed water enters exhaust heat boiler and recycles.
Temperature raise after recirculated cooling water in the aforementioned condenser absorbed heat, and a part of circulating water enters the fermenting tub in the system of system natural pond, and for fermenting tub provides heat, remaining circulating water enters the cooling tower cooling; The circulating water that comes out from fermenting tub and converge from the cooling water that cooling tower comes out enters condenser and recycles as recirculated cooling water.
Discharge by chimney through the flue gas after the exhaust heat boiler cooling.
The steam that water heat absorption back in the exhaust heat boiler produces is superheated vapor or saturated vapour.
The pressure range of described superheated vapor or saturated vapour is 0.3MPa~1.5MPa, and temperature range is 135 ℃~350 ℃.
Adopt preceding method to recycle the device of waste heat in discharged smoke of marsh gas power generation, comprise biogas internal-combustion engine, exhaust heat boiler, condenser, screw expansion motor and generator, be connected successively by pipeline between biogas internal-combustion engine, exhaust heat boiler, screw expansion motor and the condenser, and link to each other through reflow pipe between condenser and the exhaust heat boiler, be connected for axle between generator and the screw expansion motor.
Described device also comprises fermenting tub and the cooling tower in the system of system natural pond, and fermenting tub and cooling tower are all by pipeline formation in parallel with condenser loop.This device preferably also comprises chimney, and exhaust heat boiler is connected by pipeline with chimney.
Above-described screw expansion motor is twin-screw expansion motive power machine or single screw expansion motor.
Compared with prior art, the present invention utilizes the smoke discharging residual heat after the generating of biogas internal-combustion engine to produce steam, thermal power machine-the screw expansion motor that enters low taste then expands to do work and generates electricity, to hang down taste heat energy and directly be converted to electric energy, the electric power that is produced can merge online with biogas internal-combustion engine electricity power.The technology of the present invention is implemented easily, and is workable, is not subjected to the influence of marsh gas power generation factory remote location, can directly be electric energy and outwards conveying with thermal power transfer, overcome the narrow limitation that traditional smoke discharging residual heat utilizes mode effectively.
Description of drawings:
Fig. 1 is the device schematic representation that the present invention recycles a kind of mode of execution of waste heat in discharged smoke of marsh gas power generation.
Embodiment:
Embodiments of the invention 1: the method for recycling waste heat in discharged smoke of marsh gas power generation is: the smoke evacuation after 3 generatings of biogas internal-combustion engine enters exhaust heat boiler 4, carries out heat exchange with water, and flue-gas temperature reduces, and the flue gas after the cooling is discharged by chimney 5; The saturated vapour (pressure 0.7MPa~1.1MPa, 200 ℃~280 ℃ of temperature) that water heat absorption back produces enters the acting generating of expanding of screw expansion motor 6 and generator 7, and steam discharge enters condenser 8, and condensed water enters exhaust heat boiler 4 and recycles.Recirculated cooling water in the condenser 8 absorbs steam discharge and condenses that temperature raises behind the liberated heat, and a part of circulating water enters the fermenting tub 2 in the system natural pond system 1, and for fermenting tub 2 provides heat, another part circulating water enters cooling tower 9 coolings; Circulating water after fermenting tub 2 release heat and the cooling water that comes out from cooling tower 9 converge, and enter condenser 8 and recycle as recirculated cooling water.
Recycle the used device (see figure 1) of waste heat in discharged smoke of marsh gas power generation according to the method described above, comprise fermenting tub 2, biogas internal-combustion engine 3, exhaust heat boiler 4, chimney 5, screw expansion motor 6, generator 7, condenser 8 and cooling tower 9 in the system natural pond system 1.Be connected successively by pipeline between biogas internal-combustion engine 3, exhaust heat boiler 4, screw expansion motor 6 and the condenser 8, and link to each other through reflow pipe between condenser 8 and the exhaust heat boiler 4, be connected for axle between generator 7 and the screw expansion motor 6.Fermenting tub 2 and cooling tower 9 are all by pipeline and condenser 8 formation in parallel loops.Exhaust heat boiler 4 and chimney 5 are connected by pipeline.Used screw expansion motor 6 is the twin-screw expansion motive power machine.
Embodiments of the invention 2: the method for recycling waste heat in discharged smoke of marsh gas power generation is: the smoke evacuation after 3 generatings of biogas internal-combustion engine enters exhaust heat boiler 4, carries out heat exchange with water, and flue-gas temperature reduces, and the flue gas after the cooling enters atmosphere; The superheated vapor (pressure 1.1MPa~1.5MPa, 280 ℃~350 ℃ of temperature) that water heat absorption back produces enters the acting generating of expanding of screw expansion motor 6 and generator 7, and steam discharge enters condenser 8, and condensed water enters exhaust heat boiler 4 and recycles.Recirculated cooling water in the condenser 8 absorbs steam discharge and condenses that temperature raises behind the liberated heat, and a part of circulating water enters the fermenting tub 2 in the system natural pond system 1, and for fermenting tub 2 provides heat, remaining circulating water enters cooling tower 9 coolings; Circulating water after fermenting tub 2 release heat and the cooling water that comes out from cooling tower 9 converge, and enter condenser 8 and recycle as recirculated cooling water.
Recycle the device of waste heat in discharged smoke of marsh gas power generation according to the method described above, comprise fermenting tub 2, biogas internal-combustion engine 3, exhaust heat boiler 4, screw expansion motor 6, generator 7, condenser 8 and cooling tower 9 in the system natural pond system 1.Be connected successively by pipeline between biogas internal-combustion engine 3, exhaust heat boiler 4, screw expansion motor 6 and the condenser 8, and link to each other through reflow pipe between condenser 8 and the exhaust heat boiler 4, be connected for axle between generator 7 and the screw expansion motor 6.Fermenting tub 2 and cooling tower 9 are all by pipeline and condenser 8 formation in parallel loops.Used screw expansion motor 6 is single screw expansion motor.
Embodiment 3: the method for recycling waste heat in discharged smoke of marsh gas power generation is: the smoke evacuation after 3 generatings of biogas internal-combustion engine enters exhaust heat boiler 4, carries out heat exchange with water, and flue-gas temperature reduces, and the flue gas after the cooling enters atmosphere; The saturated vapour (pressure 0.3MPa~1.0MPa, 135 ℃~250 ℃ of temperature) that water heat absorption back produces enters the acting generating of expanding of screw expansion motor 6 and generator 7, and steam discharge enters condenser 8, and condensed water enters exhaust heat boiler 4 and recycles.
Recycle the device of waste heat in discharged smoke of marsh gas power generation according to the method described above, comprise biogas internal-combustion engine 3, exhaust heat boiler 4, screw expansion motor 6, generator 7 and condenser 8, be connected successively by pipeline between biogas internal-combustion engine 3, exhaust heat boiler 4, screw expansion motor 6 and the condenser 8, and link to each other through reflow pipe between condenser 8 and the exhaust heat boiler 4, be connected for axle between generator 7 and the screw expansion motor 6.Described screw expansion motor 6 is the twin-screw expansion motive power machine.

Claims (7)

1. method of recycling waste heat in discharged smoke of marsh gas power generation is characterized in that: the smoke evacuation after biogas internal-combustion engine (3) generating enters exhaust heat boiler (4), carries out heat exchange with water, and the flue gas after the cooling is discharged; The steam that water heat absorption back produces enters the acting of expanding of screw expansion motor (6) and generator (7) and generates electricity, and steam discharge enters condenser (8), and condensed water enters exhaust heat boiler (4) and recycles; Temperature raise after recirculated cooling water in the condenser (8) absorbed heat, and a part of circulating water enters the fermenting tub (2) in the system natural pond system (1), and for fermenting tub (2) provides heat, remaining circulating water enters cooling tower (9) cooling; Circulating water that comes out from fermenting tub (2) and the cooling water that comes out from cooling tower (9) converge, and enter condenser (8) and recycle as recirculated cooling water.
2. according to the method for the described recycling waste heat in discharged smoke of marsh gas power generation of claim 1, it is characterized in that: discharge by chimney (5) through the flue gas after exhaust heat boiler (4) cooling.
3. according to the method for the described recycling waste heat in discharged smoke of marsh gas power generation of claim 1, it is characterized in that: the steam that the water heat absorption back in the exhaust heat boiler (4) produces is superheated vapor or saturated vapour.
4. according to the method for the described recycling waste heat in discharged smoke of marsh gas power generation of claim 3, it is characterized in that: the pressure range of described superheated vapor or saturated vapour is 0.3MPa~1.5MPa, and temperature range is 135 ℃~350 ℃.
5. adopt the device of each described method recycling waste heat in discharged smoke of marsh gas power generation among the claim 1-4, comprise biogas internal-combustion engine (3), exhaust heat boiler (4) and condenser (8), it is characterized in that: also comprise screw expansion motor (6), generator (7), fermenting tub (2) and cooling tower (9) in the system natural pond system (1), biogas internal-combustion engine (3), exhaust heat boiler (4), be connected successively by pipeline between screw expansion motor (6) and the condenser (8), and link to each other through reflow pipe between condenser (8) and the exhaust heat boiler (4), for axle is connected, fermenting tub (2) and cooling tower (9) are all by pipeline and condenser (8) formation in parallel loop between generator (7) and the screw expansion motor (6).
6. according to the device of the described recycling waste heat in discharged smoke of marsh gas power generation of claim 5, it is characterized in that: also comprise chimney (5), exhaust heat boiler (4) is connected by pipeline with chimney (5).
7. according to the device of the described recycling waste heat in discharged smoke of marsh gas power generation of claim 5, it is characterized in that: described screw expansion motor (6) is twin-screw expansion motive power machine or single screw expansion motor.
CN2009100760352A 2009-01-05 2009-01-05 Method and device for recycling waste heat in discharged smoke of marsh gas power generation CN101586513B (en)

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CN102853417A (en) * 2011-07-01 2013-01-02 朱永彪 Gas combustion chamber
CN102853418A (en) * 2011-06-29 2013-01-02 朱永彪 Gas combustion chamber
CN102865569A (en) * 2011-07-04 2013-01-09 朱永彪 Gas combustion chamber

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CN110553238A (en) * 2019-08-19 2019-12-10 江苏京泓生态环保有限公司 Waste heat recovery device and method in organic waste treatment
CN110822438A (en) * 2019-11-07 2020-02-21 光大环保技术研究院(南京)有限公司 Waste incineration power generation system and method

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CN102853418A (en) * 2011-06-29 2013-01-02 朱永彪 Gas combustion chamber
CN102853418B (en) * 2011-06-29 2015-12-09 朱永彪 Gas combustion chamber
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CN102853417B (en) * 2011-07-01 2016-05-18 朱永彪 Gas combustion chamber
CN102865569A (en) * 2011-07-04 2013-01-09 朱永彪 Gas combustion chamber
CN102865569B (en) * 2011-07-04 2016-05-18 朱永彪 Gas combustion chamber

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