Apparatus and method for withdrawing gaseous decomposition products from a refuse dump
First Claim
1. A method of measuring and controlling the withdrawal of decomposition gas having uniform consumer value assured from a refuse dump which can lie above ground or depressed in the ground via an arrangement for withdrawing gaseous decomposition products, said arrangement including gas collection mechanisms disposed at a distance from one another in various locations in the refuse;
- the gaseous decomposition products are conveyed from said gas collection mechanisms to a gas collector, and are then supplied to a consumer via a delivery pipe;
said method comprising the steps of;
conveying said gaseous decomposition products that accumulate in each of said gas collection mechanisms to said gas collector via separate gas flows;
determining and measuring concentration of the gaseous decomposition products in each of said gas flows, each of which is associated with a given one of said gas collection mechanisms in the refuse dump; and
restricting a given gas flow when said concentration of a gaseous decomposition product selected from the group consisting of nitrogen, carbon dioxide, methane and oxygen exceeds a predetermined first threshold value, and increasing a given gas flow when said concentration of the gaseous decomposition product falls below a predetermined second threshold value for continuously and critically controlling gas flow corrected for conveying thereof uniformly in consumer value under pressure from the gas collector as a consumer based upon sensing proportionally as to concentration of the decomposition gas.
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Accused Products
Abstract
An apparatus and method for withdrawing gaseous decomposition products from a refuse dump. Disposed at various locations in the refuse are gas collection mechanisms, such as gas wells, drainage systems, etc., each of which is connected via a gas withdrawal line with a collector, from which the gas is withdrawn for further utilization. Disposed in each gas withdrawal line is a sensor and a regulatable shutoff device. The sensor transmits the content of a characteristic constituent of the gas flow in a given gas withdrawal line to a measuring and control unit, which monitors the gas flow volume as a function of a comparison of the sensor signals with preset threshold values. If the sensors indicate that the content of the characteristic constituent of the gas flow exceeds or drops below the preset threshold values, the measuring and control unit opens or closes the associated shutoff device by an appropriate amount.
91 Citations
20 Claims
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1. A method of measuring and controlling the withdrawal of decomposition gas having uniform consumer value assured from a refuse dump which can lie above ground or depressed in the ground via an arrangement for withdrawing gaseous decomposition products, said arrangement including gas collection mechanisms disposed at a distance from one another in various locations in the refuse;
- the gaseous decomposition products are conveyed from said gas collection mechanisms to a gas collector, and are then supplied to a consumer via a delivery pipe;
said method comprising the steps of;conveying said gaseous decomposition products that accumulate in each of said gas collection mechanisms to said gas collector via separate gas flows; determining and measuring concentration of the gaseous decomposition products in each of said gas flows, each of which is associated with a given one of said gas collection mechanisms in the refuse dump; and restricting a given gas flow when said concentration of a gaseous decomposition product selected from the group consisting of nitrogen, carbon dioxide, methane and oxygen exceeds a predetermined first threshold value, and increasing a given gas flow when said concentration of the gaseous decomposition product falls below a predetermined second threshold value for continuously and critically controlling gas flow corrected for conveying thereof uniformly in consumer value under pressure from the gas collector as a consumer based upon sensing proportionally as to concentration of the decomposition gas.
- the gaseous decomposition products are conveyed from said gas collection mechanisms to a gas collector, and are then supplied to a consumer via a delivery pipe;
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2. An arrangement for withdrawing gaseous decomposition products form a refuse dump which can lie above ground or depressed in the ground in which refuse is deposited in a substantially gastight chamber on one hand to prevent air penetration into the refuse and on the other hand to prevent any uncontrolled exit of decomposition products from the refuse dump whereby simultaneously control of decomposition products occurs having such constituents so that uniform consumer value thereof is assured;
- gas collection mechanisms are disposed at a distance from one another in various locations in said refuse, with gaseous decomposition products being withdrawn from said gas collection mechanisms via gas withdrawal lines;
said arrangement comprising;a separate gas withdrawal line associated with each of said gas collection mechanisms; a gas collector into which all of said gas withdrawal lines open; withdrawal means with which said gaseous decomposition products are withdrawn from said collector for further use; a respective regulatable shutoff device disposed in each of said gas withdrawal lines; at least one sensor associated with each of said gas withdrawal lines for determining and measuring concentration of said gaseous decomposition products therein; and a measuring and control unit with which each of said sensors is connected for transmitting signals thereto when said concentration of said gaseous decomposition product selected from the group consisting of nitrogen, carbon dioxide, methane and oxygen, exceeds a predetermined first threshold value and for increasing a given gas flow when said concentration falls below a predetermined second threshold value, as a function of a signal transmitted to it from a given sensor, said measuring and control unit having means for regulating the shutoff device associated with that given sensor for continuously and critically controlling gas flow corrected for conveying thereof uniformly in consumer value under pressure from the gas collector as a consumer based upon sensing proportionally as to concentration of the decomposition gas. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
- gas collection mechanisms are disposed at a distance from one another in various locations in said refuse, with gaseous decomposition products being withdrawn from said gas collection mechanisms via gas withdrawal lines;
Specification