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AssigneeMartin GmbH fuer Umwelt- und Energietechnik
InventorsJohannes Martin, Peter Spichal
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To detect a regulating quantity which is directly proportional to the combustion temperature, an infrared measuring device in the form of an infrared pyrometer is provided in the descending waste gas flue of an incineration plant and measures the temperature of the waste gases. The influence of radiation from the glowing fuel bed or the flame is excluded by arranging this measuring device in the descending waste gas flue. The temperature-dependent regulating quantity which is determined in this way can be used directly or indirectly to influence the combustion process. In a preferred application, the temperature-dependent regulating quantity serves to influence the supply of fuel and the speed of the combustion grate, while a regulating quantity derived from the mass flow of steam serves to influence the supply of primary air.
A method for regulating the furnace in incineration plants, in particular in refuse incineration plants, in which the temperature caused by combustion is used alone or in combination with other regulating variables as a direct or indirect regulating quantity, said method comprising the steps of:
Dependencies are inferred from the claim text.
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No related US applications are recorded in the indexed filing history.
Using light-sensitive elements: using electronic means
Radiation pyrometry, e.g. infrared or optical thermometry: for sensing the radiation from gases, flames
Temperature: stack temperature
Applications: incinerating apparatus
Term ended 8 Aug 2015 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
a) Field of the Invention
The invention is directed to a method for regulating the furnace in incineration plants, in particular in refuse incineration plants, in which the temperature caused by combustion is used alone or in combination with other regulating variables as a direct or indirect regulating quantity.
b) Description of the Related Art
The sole drawing illustrates, in schematic form, a section through an incineration plant in accordance with the invention.
As will be seen from the schematic drawing, an incineration plant has a furnace 1 and a boiler 2. The furnace 1 has a charging hopper 3 with adjoining delivery chute 4, a delivery table 5 and charging rams 6 which feed the garbage falling down the delivery chute 4 to a furnace grate 7 via the delivery table. In the example shown in the drawing, this furnace grate 7 is constructed as a reciprocating grate and can execute stoking movements corresponding to the double arrow 8. The drive of the furnace grate 7 is designated by 9. The drive for the charging rams 6 is designated by 10. Further, the fumace has an ascending waste gas flue 11 and a descending waste gas flue 13 adjoining a deflecting edge 12. The hot waste gases pass via the waste gas flue 13 to the boiler 2 arranged downstream and to other devices, e.g., waste gas cleaning systems, not shown. Individual underfire air zones 14, 15 and 16 which are acted upon by a common fan 17 are located below the furnace grate 7. Regulating devices 23 and feed lines leading to the underfire air zones are provided in order to distribute the primary air which is fed from below to the individual underfire air zones as needed.
The fuel or combustible material located on the furnace grate 7 forms the fuel bed 18 and the ash occurring at the end of the furnace grate falls into an ash drop chute 19.
According to the shown embodiment example, the combustion temperature or a temperature directly proportional thereto on the one hand and the mass flow of steam on the other hand are used as regulating quantities for regulating the furnace or furnace output. In so doing, the combustion temperature is detected by measuring the waste gas temperature or a comparison body 28 influenced in a directly proportional manner by the waste gas temperature, and this combustion temperature is supplied to a regulator 21 as regulating quantity 20. An infrared measuring device 22 which is arranged, according to the invention, in the descending waste gas flue 13 is used to detect the regulating quantity 20. This step is taken in order to exclude interference resulting from radiation of the fuel bed 18 or flames 24 in measuring the temperature of the waste gases. The regulator 21 regulates the fuel supply, i.e., the amount of garbage to be delivered per unit of time, by acting upon the drive 10 for the charging rams 6. Further, the drive 9 for the stoking speed of the furnace grate 7 can also be regulated proceeding from regulator 21 in order to influence the distribution and movement speed of the fuel in the fuel bed 18 on the furnace grate 7.