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

A biogas power generation and waste heat technology, applied in steam engine installations, engine components, combustion engines, etc., to achieve the effect of easy technology, strong operability, and overcoming limitations

Active Publication Date: 2009-11-25
CHINA HUADIAN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the above three ways of recovering waste heat from exhaust gas generated by biogas power generation are not the best way to utilize waste heat

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1 of the present invention: the method for recovering and utilizing the waste heat of exhaust gas generated by biogas power generation is as follows: the exhaust gas generated by the biogas internal combustion engine 3 enters the waste heat boiler 4 for heat exchange with water, the temperature of the flue gas is lowered, and the cooled flue gas passes through the chimney 5 Discharge; the saturated steam (pressure 0.7MPa~1.1MPa, temperature 200℃~280℃) produced after the water absorbs heat enters the screw expansion power machine 6 and the generator 7 for expansion and power generation, and the exhaust steam enters the condenser 8, and the condensed water Enter the waste heat boiler for 4 cycles. The temperature of the circulating cooling water in the condenser 8 rises after absorbing the heat released by the condensation of the exhaust steam. Part of the circulating water enters the fermenter 2 in the biogas system 1 to provide heat for the fermenter 2, and th...

Embodiment 2

[0020] Embodiment 2 of the present invention: the method for recovering and utilizing the waste heat of exhaust gas generated by biogas power generation is as follows: the exhaust gas generated by the biogas internal combustion engine 3 enters the waste heat boiler 4 for heat exchange with water, the temperature of the flue gas is lowered, and the cooled flue gas is discharged into the atmosphere The superheated steam (pressure 1.1MPa~1.5MPa, temperature 280°C~350°C) produced after water absorbs heat enters the screw expansion power machine 6 and generator 7 for expansion and power generation, exhaust steam enters condenser 8, and condensed water enters The waste heat boiler is used in 4 cycles. The temperature of the circulating cooling water in the condenser 8 rises after absorbing the heat released by the condensation of the exhaust steam. Part of the circulating water enters the fermenter 2 in the biogas system 1 to provide heat for the fermenter 2, and the rest of the circ...

Embodiment 3

[0022] Embodiment 3: The method for recovering and utilizing the waste heat of exhaust gas generated by biogas power generation is as follows: the exhaust gas generated by the biogas internal combustion engine 3 enters the waste heat boiler 4 for heat exchange with water, the temperature of the flue gas is lowered, and the cooled flue gas is discharged into the atmosphere; The saturated steam (pressure 0.3MPa~1.0MPa, temperature 135℃~250℃) generated after heating enters the screw expansion power machine 6 and the generator 7 for expansion and power generation, the exhaust steam enters the condenser 8, and the condensed water enters the waste heat boiler 4 recycle.

[0023] According to the above-mentioned method, the device for recovering and utilizing the waste heat of exhaust gas generated by biogas power generation includes a biogas internal combustion engine 3, a waste heat boiler 4, a screw expansion power machine 6, a generator 7 and a condenser 8, a biogas internal combu...

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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 smoke after 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 steam 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. The method 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 converted to the electric power and transmitted to the outside. The limitation of waste gas utilization mode of traditional smoke discharging is overcome.

Description

Technical field: [0001] The invention relates to a method and a device for recovering and utilizing the waste heat of exhaust gas generated by biogas power generation, and belongs to the technical field of biomass energy utilization. Background technique: [0002] Biogas power generation is mainly divided into three parts, one is biogas production, the other is the use of biogas internal combustion units to generate electricity, and the third is the utilization of waste heat from internal combustion engines. The waste heat utilization of the biogas generator is divided into two parts, one is the waste heat utilization of the smoke exhaust, and the other is the utilization of the cooling heat of the generator itself. Due to the limitation of the generator set itself, the cooling heat of the generator itself is mainly to generate hot water at about 80°C. The exhaust gas temperature of the generator is generally around 450°C to 500°C. There are three main ways to use the exhau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02G5/02F01K23/06F01D15/10
CPCY02T10/166Y02E20/18Y02P80/15Y02T10/12
Inventor 贠小银李和平宿建峰邱河梅
Owner CHINA HUADIAN ENG
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