Apparatus for extracting of biogas for neutralizing range proving ground for storage of solid domestic wastes

FIELD: equipment for neutralizing range proving grounds for storage of solid domestic wastes by extracting of biogas for further utilization thereof.

SUBSTANCE: apparatus has collector, perforated gas collecting pipes, condensate collector, flow rate meter, sampler, switching-off device, conveyance pipeline, and compressor station. Branches of perforated gas collecting pipes are connected to collector through flexible inserts. Stoppers are located at free ends of gas collecting pipes and collector. Condensate collector, flow rate meter, sampler and switching-off device are mounted on collector which is connected by conveyance pipeline through compressor station to cogenerator. Conveyance pipeline is equipped with compressed gas outlet.

EFFECT: simplified construction, enhanced reliability in operation and increased efficiency of biogas collecting apparatus.

2 dwg, 2 ex

 

The invention relates to a device for the disposal of solid waste landfills to extract biogas and its further use.

Landfill gas, consisting mainly of methane and carbon dioxide, is formed especially in large quantities in landfills, where step by step processes of biochemical decomposition of organic components of the buried waste. As a result, over time the operation of the landfill not only is energy wasted, which could replace the required energy flow from outside, but also creates a hazard for the environment. The main negative factor generated by landfill gas, is a high fire danger. In addition, biogas physiologically affects people, animals and plants, is the source of a specific odor, and participates in the "greenhouse effect".

The amount of biogas generated at the polygon depends on the stage of biochemical processes. A great influence on their course has the age of the landfill and methods of waste disposal, sealing and insulation. Biogas production begins at the age of 2-5 years from the beginning of the operation of the landfill. To increase the amount of biogas produced the necessary layer-by-layer laying waste their seal and the device is reliable gas-tight isolation, which pre will hinder the migration of the gas accumulations in the body of the landfill and biogas production from the surface of the ground in the form of uncontrolled emissions.

Widespread collection systems biogas found in Europe, particularly in Germany, which uses both vertical and horizontal scheme of biogas capture [Betriebsleiterhandbuch. Deponiegas /Rettenberger G. u.a. Stuttgart, 1995/ 300 S.].

The closest in technical essence and the achieved result is a device for implementing the method of the extraction of biogas containing a collecting reservoir, the gas manifold perforated pipe, the condensate, flow meter, sampler, disable device, transporting pipeline, compressor station [RF Patent №2127608, 1997].

The disadvantage of this device is the presence of a corrugated pipe, which reduces the stability of the system of collecting biogas to dynamic loads (e.g., transport), but also leads to reduction of the volume of recoverable biogas as possible deformations (e.g. subsidence) and bends the holes located between the corrugations, will be closed.

The disadvantage of this device is the presence of pipes and precast collector open loose ends, designed for the discharge of drainage water. With such design, construction, research has shown that the main stream of collected biogas goes through these open ends, due to their lower hydraulic resistance, with holes between the corrugations do not work,which leads to the reduction of the useful area of service of the polygon, therefore, reducing the amount of recoverable biogas. In addition, through the open ends of the pipes due to the created vacuum in the system are small fractions of the granular material and debris. And the presence of large amounts of gas equipment for each branch of the system (flow regulating valves, samplers) increases the cost of the device.

Technical problem - increasing the reliability and effectiveness of the device for collection of biogas while simplifying the structure of the device.

The task is solved in that the device for the extraction of biogas for disposal landfill storing solid municipal wastes containing collector Assembly, gas gathering perforated pipe, the condensate, flow meter, sampler, disable device, transporting pipeline, compressor station, with branches perforated gas pipe connected to the assembled manifold via flexible, and at the free ends of pipes and precast collector installed plugs, while the condensate, flow meter, sampler and tripping device mounted on a collapsible reservoir, which is connected to the conveyor pipe through the compressor station with the co-generator, in addition, transporting the pipe has a discharge of compressed gas.

Application for btes is and biogas smooth steel perforated pipes instead of the corrugated perforated pipe, the use of flexible inserts, and install plugs at the free ends of the branches of the gas manifold pipe and precast collector provide higher reliability and efficiency of the device for the extraction of biogas for disposal landfill storing solid municipal wastes in comparison with the device according to the prototype, and the neutralization of biogas in the device is carried out by converting the energy of combustion gas in electricity and heat that, in turn, reduces the environmental and fire hazard polygons storage of solid waste, which is a new technical effect of the claimed invention.

The proposed device for the extraction of biogas for disposal landfill storing solid municipal waste is illustrated by drawings.

Figure 1 schematically shows a General view of the device.

Figure 2 presents the node a And the wiring precast collector to the transporting pipeline.

The device contains a gas gathering perforated pipe 1, a collecting reservoir 2, the transporting pipe 3, a compressor station 4 and engine 5. When this gas gathering perforated pipe 1 is connected by flexible inserts 6 with a collecting reservoir 2, which, in turn, is connected by a flexible insert 6 with transfer tube , and transporting pipeline through the compressor station 4 with co-generator 5. At the free ends of the branches of perforated pipes 1 and precast collector 2 installed plugs (not shown), which protect the device from contamination of dust and small debris, and create favorable hydraulic mode. Collector Assembly in the underground part is equipped with a condensate 7, and the output of the land - flow meter 8, disable device 9 and the sampler 10. The transporting pipe 3 has an outlet 11 for compressed biogas for industrial consumers.

Extraction of biogas for disposal landfill storing solid municipal wastes using the proposed device is as follows.

The gas manifold pipe, made in the form of branches smooth steel perforated pipe 1 connected to a collecting reservoir 2, is placed in the storage of solid waste at a depth of 0.8 m along the lines of the natural flow of drainage water with a slope of 2 degrees in the side opposite their connections with precast header.

Using compressor station 4 in perforated pipes 1 creates the necessary vacuum. Due to the differential pressure in the body of the landfill and within the perforated pipes is the absorption of biogas through the holes. The biogas collection the collector 2 and further through the transporting pipe 3 and the compressor station 4 in engine 5. Part of the moisture supplied with biogas in the perforated pipe 1, is collected and removed through openings in the lower part of the perforated pipes. The remaining moisture is transported together with the biogas into a collecting reservoir 2 and is collected in the condensate 7 and are periodically removed.

Disposal of biogas is carried out in co-generator 5. Thus the extracted biogas enters the engine, where the conversion of the energy of the combusted biogas into electricity and heat with subsequent delivery to the consumer, in addition, part of the extracted biogas is given in a compressed state to supply the nearby industrial users.

To verify the claimed device studies have been conducted on existing solid waste landfills and related laboratory experiments.

Example 1. Gas gathering perforated tube length of 50 m was placed in storage at a depth of 0.8 m on the granulated material with an angle of 2 degrees, was connected through a flexible insert with a collecting reservoir 100 m long and covered the same material. The free end of the collapsible reservoir through a flexible insert, the condensate, flow meter, disconnect the device, and the sampler was connected with transfer tube and then through the compressor station to which eneration. The device collects the gas from the landfill sizes 100×100 m and a depth of 10 meters the volume of collected gas is 55÷60 m3/H. With the consumption of gas 55 m3/h engine produces 100 kW of electricity and 168 kW of thermal energy, the generator efficiency is 92%. Electricity for the needs of administrative and auxiliary buildings of the polygon, while thermal energy in the form of hot water with a temperature of 80°goes to space heating and households (greenhouses, poultry houses and the like), as well as hot water for sanitary needs of staff.

Example 2. Gas gathering perforated tube length of 50 m was placed in storage at a depth of 0.8 m on the granulated material with an angle of 2 degrees, was connected through a flexible insert with a collecting reservoir 100 m long and covered the same material. The free end of the collapsible reservoir through a flexible insert, the condensate, flow meter, disconnect the device, and the sampler was connected with transfer tube and then through a compressor station with a co-generator. The device collects the gas from the landfill sizes 100×100 m and a depth of 10 meters the volume of collected gas is 55 m3/H. the Overall efficiency of the co-generator when the gas flow 42 m3/h is of 92.7%. Electric powerfully the th - 75 kW, thermal - 132 kW. The remaining volume of biogas (13 m3/h) using a compressor stations compress and fill their tanks. This volume is sufficient to fill four 50-l tanks. Compressed biogas installed on mobile becomevery unit, equipped with special burners. The contents of one container is sufficient for preparation of 200 liters (0.2 m3) bituminous mixture used in the repair of roads and isolation of various pipelines.

When laying of gas pipes at a depth of 0.8 m, the angle of inclination of 2 degrees and the length of the tubes 50 m the greatest depth of the free ends of the pipes is 2.55 m, which is technically quite feasible.

Theoretical hourly rate of the gas generated on average for 30 years on a plot of ground measuring 100×100×10 m, is 55-60 m3/H. With this selection of biogas ensures uninterrupted operation of the device for 25-30 years.

Thus, the analysis of the researches showed that the claimed device can improve performance by removing biogas in comparison with the device of the prototype by 10%. And the installation of gas equipment only to the collection manifold allows to reduce costs for maintenance of the device without disturbing the process of collecting biogas. In addition, the transformation of energy burned is th biogas into heat and electrical contributes to reduction in the combustion of municipal solid waste landfill, as well as reducing the impact of landfill gas on the environment.

Device for extraction of biogas for disposal landfill storing solid municipal wastes containing collector Assembly, gas gathering perforated pipe, the condensate, flow meter, sampler, disable device, transporting pipeline, compressor station, characterized in that branch of the perforated gas pipe connected to the assembled manifold via flexible, and at the free ends of pipes and precast collector installed plugs, while the condensate, flow meter, sampler and tripping device mounted on a collapsible reservoir, which is connected to the conveyor pipe through the compressor station with the co-generator, in addition transporting pipe has a discharge of compressed gas.



 

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3 ex

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FIELD: equipment for neutralizing range proving grounds for storage of solid domestic wastes by extracting of biogas for further utilization thereof.

SUBSTANCE: apparatus has collector, perforated gas collecting pipes, condensate collector, flow rate meter, sampler, switching-off device, conveyance pipeline, and compressor station. Branches of perforated gas collecting pipes are connected to collector through flexible inserts. Stoppers are located at free ends of gas collecting pipes and collector. Condensate collector, flow rate meter, sampler and switching-off device are mounted on collector which is connected by conveyance pipeline through compressor station to cogenerator. Conveyance pipeline is equipped with compressed gas outlet.

EFFECT: simplified construction, enhanced reliability in operation and increased efficiency of biogas collecting apparatus.

2 dwg, 2 ex

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125 cl, 6 dwg, 1 tbl

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