16 results about "Landfill gas" patented technology

A dielectric barrier discharge system, employed to reform / remove organosilicon contaminants off a carrier stream to provide a sustainable, end-of-technology way of siloxane removal that will ensure siloxane does not re-enter the carrier stream, as well as generates useful end-products.

The application discloses a kind of turbine flowmeter monitoring module, including gas well, gas analyzer, flow monitoring regulating device, gas pipeline, control center and internal combustion generator set;The flow monitoring regulating device includes turbine flowmeter and signal end;The turbine flowmeter includes shell, guide vane, impeller, rotating plate;The fixed component is installed in the guide vane near one end of impeller;The data of the component content of landfill gas collected by gas analyzer is received by control center, according to the received data and the flow rate information of landfill gas in gas pipeline obtained by signal end, control flow monitoring regulating device, adjust the extraction speed of landfill gas, avoid the occurrence of dead well phenomenon;The two ends of impeller are supported by sleeve, and the impeller is axially positioned by the ball, when the impeller is damaged, the rotating plate is opened, and the impeller and the guide vane can be separated by sliding sleeve, which is convenient for maintaining the impeller.

The utility model relates to the technical field of sanitary landfill of household garbage, in particular to a landfill side slope landfill gas guiding and discharging system which comprises a gas collecting well, a gas guiding blind ditch and a connecting blind ditch, and the center of the gas collecting well is fixedly connected with an HDPE gas guiding pipe. The gas guide blind ditch is arranged in the irregular area, the side slope area or the corner area of the landfill, and the connecting blind ditch is connected with the nearest gas collecting well, so that the influence of the gradient of the side slope area on the drilling depth of the conventional gas collecting well is eliminated, and the gas guide effect of the landfill gas in the side slope area is greatly enhanced; meanwhile, the defect that the coverage range of a conventional gas collecting well is limited can be overcome, the gas guide blind ditches can be flexibly arranged according to on-site topography, slope gradient changes and the like, the guide and drainage coverage range is large, the whole device is easy to construct and reliable in structure, and the risk that the conventional gas collecting well damages a slope bottom anti-seepage structure is reduced; and safe and stable operation of the landfill gas guiding and discharging system is facilitated.

The application relates to the technical field of underground engineering safety and environment, and discloses a gradient filling and covering layer gas absorption construction method for a gas guide well non-combustible filler, which comprises the following steps: arranging a core gas channel inner tube with an inverted drainage bell structure at the lower end, filling inert aggregates in the annular cavity formed between the core gas channel inner tube and the well wall, and injecting liquid to form a dynamic liquid seal ring which can self-adapt to geological subsidence, and arranging a heat pipe to establish a freeze-proof regulation loop using the residual heat of landfill gas. The application avoids the gas side leakage problem caused by the uneven settlement of traditional solid fillers by constructing a dynamic liquid seal ring, and realizes self-cleaning by utilizing the energy of landfill gas to drive the drainage bell structure, so that the solid phase deposition problem inevitably caused in the liquid phase purification scheme is converted into an internal circulation without energy consumption, and the gas guide well system can realize long-term self-maintenance and stable operation in a dynamic geological environment.

An apparatus including: a housing configured for installation in a landfill; a differential pressure sensor and at least one gas sensor in the housing; and a first valve configured to control landfill gas (LFG) flow to the at least one gas sensor, wherein the first valve is configured to open when the differential pressure sensor detects a selected pressure difference or pressure difference change between the atmospheric air pressure and the LFG pressure.

A control system for controlling extraction of landfill gas, comprising: at least one sensor configured to measure one or more characteristics of landfill gas; at least one flow control mechanism disposed in well piping and configured to control flow of the landfill gas through the well piping; and at least one processor configured to: obtain a measured concentration of a first gas in landfill gas; determine whether the measured concentration of the first gas is either less than a first threshold concentration or greater than a second threshold concentration; when it is determined that the measured concentration is less than the first threshold concentration, control the at least one flow control mechanism to reduce flow rate of landfill gas; and when it is determined that the concentration is greater than the second threshold concentration, control the at least one flow control mechanism to increase the flow rate of landfill gas.

A control system for controlling extraction of landfill gas, comprising: at least one sensor configured to measure one or more characteristics of landfill gas; at least one flow control mechanism disposed in well piping and configured to control flow of the landfill gas through the well piping; and at least one processor configured to: obtain a measured concentration of a first gas in landfill gas; determine whether the measured concentration of the first gas is either less than a first threshold concentration or greater than a second threshold concentration; when it is determined that the measured concentration is less than the first threshold concentration, control the at least one flow control mechanism to reduce flow rate of landfill gas; and when it is determined that the concentration is greater than the second threshold concentration, control the at least one flow control mechanism to increase the flow rate of landfill gas.

The application belongs to the technical field of environment, and discloses a two-stage biological oxidation gas guide well, which comprises a well wall structure, a well pipe structure, a filling structure, a biological cover layer structure and a leachate irrigation structure; the well wall structure comprises a reinforced stone cage net, the reinforced stone cage net is arranged in a well hole of a garbage pile body, a first geotextile screen is fixedly installed on the outer side of the reinforced stone cage net, and a concrete base is arranged at the bottom of the outer wall of the reinforced stone cage net. The two-stage biological oxidation gas guide well is formed by the biological filling layer and the biological cover layer structure, the first-stage biological filling layer maintains moisture by using the percolate in the interior of the pile body, the second-stage biological cover layer maintains moisture by the specially arranged leachate irrigation structure, the purpose of in-situ control of landfill gas is achieved, the problem that landfill gas cannot be treated in a small landfill is solved, the two-stage biological oxidation reduces the emission amount of landfill gas, and the method is suitable for the landfill in operation and has the advantages of low cost and easy operation.

This invention relates to a method for the co-utilization of existing landfill waste and landfill gas to produce renewable methanol. RDF (Regenerative Thermal Deposition Facility) is pretreated and then purified into high-temperature syngas through pyrolysis, plasma gasification, desulfurization, and steam reforming. This purified syngas is mixed with steam-reformed landfill gas and green hydrogen obtained from water electrolysis, and the ratio is adjusted to obtain a methanol reaction feedstock gas satisfying [H2 / (2CO+3CO2)=0.9-1.1]. The feedstock gas is then used to produce methanol through a methanol synthesis reaction. Under a recycle ratio of 0.6-0.8, the hydrogen-to-carbon ratio of the syngas is 0.89-1.01, the methanol production exceeds 17 tons / hour, the system energy efficiency exceeds 75%, and the CO2 equivalent emission reduction rate is 82.5-91.7%. This invention achieves complementary carbon source utilization and hydrogen-to-carbon ratio through the parallel use of landfill waste and landfill gas as dual gas sources, improving system load stability and heat cascade utilization efficiency, and providing a new solution for the co-resource utilization of waste and the large-scale production of renewable methanol.

This invention discloses a construction method for a horizontal well structure in a landfill. The method involves horizontally directional drilling into the landfill to form a horizontal well channel. During the pullback process, prestressed tendons, after prestressing tension, drive the horizontal well perforated pipe through both sides of the landfill area, enabling the drainage of leachate and landfill gas between landfill layers. This invention applies prestressed tendon tensioning technology to the perforated pipe structure for horizontal drainage in the landfill, allowing for the horizontal gravity-flow drainage of leachate. This effectively controls the leachate level in the landfill, reduces water retention in the landfill, and ensures the safe operation of the landfill and the stability of the landfill after closure. The method offers advantages such as flexible construction, high cost-effectiveness, rapid progress, and applicability to the construction of horizontal wells in various types of landfills and multi-span areas.

This invention relates to the field of landfill treatment technology and discloses a landfill gas collection device, including a filter cylinder, and further comprising: a top cylinder, which is fixedly connected to the top of the filter cylinder, and a gas guide pipe is fixedly connected inside the top cylinder, extending to the bottom of the filter cylinder and fixedly connected to a fine filter sleeve, the gas guide pipe located inside the filter cylinder having multiple sets of extraction holes, and a separation section provided on the gas guide pipe; and an extraction pipe, which is fixedly connected to the top end of the gas guide pipe, the extraction pipe having a deodorization section for treating the extracted landfill gas, and a piston section for extracting gas installed on the extraction pipe; this invention drives a friction roller by a drive motor, and uses magnetic coupling to drive a centrifugal disc to rotate at high speed, superimposing a strong mechanical rotational force field on the fluid vortex induced by the separation channel, forming a composite centrifugal force field, effectively throwing out liquid droplets in the landfill gas, significantly reducing the moisture content of the landfill gas, so as to facilitate subsequent storage or utilization of the landfill gas.

A kind of life garbage landfill gas conversion method, comprising: one, gas is sprayed to remove particulate matter and soluble gas, then target gas is separated;Two, target gas is introduced into the reaction cavity of intermittent reaction unit, and water is injected to water distribution film in reaction cavity;Water distribution film is provided with upper and lower layers, and water distribution film is uniformly distributed with several nanoscale water-permeable holes, and the orifice is located in the lower surface of film;Water distribution film is loaded with metal particles for catalysis, and metal particles are at least distributed in the lower surface of film and each nanoscale water-permeable hole;Three, reaction cavity is lighted, so that nanometer droplet of water distribution film is light catalysis reacted with target gas in reaction cavity, and the conversion of target gas is realized.The present application realizes the conversion of methane and other organic gases by nanometerizing water in air, so that ·OH is spontaneously generated, is used to activate attack C-H bond in methane.

The present invention relates to a method and a system for producing hydrogen, said method comprising the steps of: (S1) refining a landfill gas to produce a first mixed gas; (S2) steam reforming said first mixed gas in a first reactor to produce a second mixed gas; (S3) separating said second mixed gas into a first stream comprising carbon dioxide and a second stream comprising hydrogen and carbon monoxide; (S4) flowing the first stream separated in step (S3) into a second reactor and converting it into carbon monoxide by reverse Boudouard reaction; (S5) mixing said second stream with the carbon monoxide converted in step (S4) to produce a third mixed gas; (S6) producing a synthesis gas from said third mixed gas by water gas shift reaction; and (S7) separating carbon dioxide from said synthesis gas to obtain hydrogen.

The application provides a landfill anti-settlement landfill gas collecting shaft, which comprises a collecting shaft, the collecting shaft extending longitudinally to the bottom surface of the landfill, a drainage pipe, the drainage pipe extending into the bottom of the collecting shaft from top to bottom, gravel filled between the drainage pipe and the collecting shaft, a stabilizing pipe, one end of the stabilizing pipe being detachably connected to the end of the drainage pipe extending out of the covering surface, the other end of the stabilizing pipe extending into the covering surface through bending and corresponding to the pre-buried collecting shaft connecting pipe, and rammed clay, the collecting shaft being sealed by the rammed clay at the wellhead of the collecting shaft. The settlement deformation stress of the stack can be absorbed by the energy dissipation of the gravel, the stress can be uniformly transmitted, and the drainage pipe is prevented from being damaged by the settlement stress; the two ends of the stabilizing pipe are connected through the corrugated silica gel pipe, and when the stack is unevenly settled, reliable connection between the collecting pipe and the shaft can be ensured, and the structural function is normally and stably maintained.

This invention discloses a polymer-modified ETS molecular sieve, its preparation method, and its applications, belonging to the field of adsorbent technology. The preparation method of the polymer-modified ETS molecular sieve includes the following steps: impregnating the ETS molecular sieve with a polyethylene glycol solution, performing solid-liquid separation, and drying the resulting solid to obtain the polymer-modified ETS molecular sieve. This invention uses a specific polymer to impregnate and modify the ETS molecular sieve, successfully preparing a polymer-modified ETS molecular sieve. The preparation method is simple, controllable, and low-cost. The prepared modified molecular sieve exhibits extremely low CH4 adsorption and a high N2 / CH4 separation ratio when separating N2 and CH4 mixed gases. The molecular sieve prepared by this invention can be used for purifying methane from coalbed methane, oilfield gas, or landfill gas.

Systems and methods for controlling extraction of landfill gas from a landfill via a gas extraction system are provided herein. According to some aspects of the technology, there is provided site-level control methods for globally controlling one or more wells based on one or more characteristics of aggregate landfill gas collected from a plurality of wells at a gas output. According to some aspects of the technology, there is provided well-level control methods for locally controlling a first well based on or more characteristics of landfill gas collected from the first well. According to further aspects of the technology, there is provided hybrid control methods for making adjustments to a respective well based on both site-level and well-level control methods.