DK172277B1 - Appts. for optimal gasification of wood chips in auxiliary flow generator - has combustion and pyrolysis zones continuously stabilised and controlled in level area - Google Patents

Abstract

In the pyrolysis zones is fitted a temp. sensor with several temp. level ranges. The temp. sensor can continuously adjust upwards and downwards the combustion and pyrolysis temps., and the exact limited total pyrolysis range is held and combustion and pyrolysis occur esp. optimally under vacuum.

Description

GB 172277 B1 PROCEDURE AND APPARATUS FOR OPTIMAL GASING OF SPECIAL TILE, ·.

The object of the present invention is to provide a method of optimum power-heat apparatus for gasification of wood chips in particular. Where the combustion zone or pyrolysis zone, in particular a co-current generator, can be continuously stabilized and optimally controlled for in particular only one combustion at a constant combustion level or at a combustion height within a specific area.

So far, wood gas generators are known, for example, from car operation during World War II to especially larger pieces of solid fuel, where the efficiency was relatively poor.

15 And furthermore, there was a problem with a failure to control and destroy the tar content of the combustion gas which powered the engine. In particular, the tar content of the gas caused the inner metal surfaces of the piston engine to be coated more quickly.

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Also known are previously known gas gas plants, in particular stationary co-current generators for gasification of wood pulp, but where the position and extent of the critical pyrolysis and combustion zone have not been optimally optimally controlled. Why an optimal combustion as an optimum purification of the product gas technically and economically could not be reasonably done.

With the present invention, in a co-current generator, in particular for burning wood chips, it is possible to continuously control the combustion and pyrolysis zone. The top-down gassing process can be divided into four defined partial gasification zones, namely a drying zone, a pyrolysis and combustion zone, a reduction zone and an inert charcoal zone. The method 5 according to the invention is characterized by the features of claim 1.

The invention also relates to an apparatus for carrying out the method, which is characterized by the features of claim 10 2.

The control according to the invention will result in controlled leveling by raising or lowering the zone temperatures, and thus an optimal demarcation of the zones.

The result is an ideal reasonably clean combustible gas, as well as a totally burnt out porous light ash.

In addition, the invention can only function optimally in said embodiment when the wood chips zone, like the pyrolysis zone, is continuously affected by suppression. If this is not present, then the combustion in the pyrolysis zone is attenuated and extinguished.

In particular, the wood gas generator can be made open at the top as at the bottom, thereby avoiding major damage 25 by, for example, nitrous oxide formation. Incidentally, the lower part of the generator is secured against air as oxygen intake by the system being generally immersed "loose or free" in a water locking arrangement.

DK 172277 B1 3

The system will then be explained in more detail with reference to the drawing, in which Fig. 1 shows in section an embodiment of an open top co-stream wood gas generator according to the invention,

Fig. 2 shows in detail an embodiment of the tile magazine tube, according to the invention with level temperature sensor 10 and secondary control air, and

Fig. 3 shows in detail section the tile magazine tube surrounded by the pyrolysis and guide air tube.

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Fig. 1 is a sectional view of the co-open open wood gas generator according to the invention. Where the wood chip 3 is continuously filled at the top of the open wood chip magazine 2 as 18 and passes along with the primary gasification air 20 4 vertically down through the tube 18 with the underlying pyroly se and combustion zone 16.

For an optimum controlled gasification which in the present system gives off an optimum combustible gas 6, and which is optimally liberated for especially unreacted tar substances, then the pyrolysis zone 5 as 16 must be maintained at both temperature and combustion level. This is achieved by controlling the combustion 16 via the supply of a secondary control air 7. As the supply of the secondary air 7 is controlled via a continuous level temperature measurement 8 at the outlet or bottom of the vertical chip tray 2 as 18. At elevated temperature A, B as C

DK 172277 B1 4 then closes for secondary air 7, and opposite at too low temperature A, B as C, then opens for secondary air 7.

The system must also operate with constant vacuum or 5 suction at both the gas take-off 6 and in the chip gasification zone 16.

When the tile 3 is optimally gasified 6, the lightweight and finely divided ash 10 will continuously sprinkle onto an ideally rotatable ash plate 11 which, in its rotation and ashmeters, will cause the ash to continuously sprinkle 10 12 beyond the edge of the plate 11, and from here into a water bath 13 for a further transport 14 as 15. The water system 13 here also acts as an explosion lock 17.

The water level of the generator's water trap 17 can also be automatically adjusted and adjusted in height by being controlled, for example, by a rocker-liquid level sensor.

Incidentally, in this embodiment, the primary air 4 as well as the secondary control air 7 may also be indirectly preheated via some of the generator's own exhaust gas 6 before the primary air 4 and the secondary control air 7 are brought to the flaming pyrolysis zone 16.

Figure 2 shows in detail section the tile magazine tube 18 with level temperature sensor 8 as secondary control air 7, a 25 internal temperature sensor 8 with probes at different levels A, B which C can detect the combustion temperature in the lower part of the vertical tile magazine tube 5 If temperature 8 such as A, B and C falls, then automatic control air 9 (II) 7 is automatically opened, and if temperature 8 30 rises, control air (II) 7 is closed.

DK 172277 Pg 5

The primary air 4 as the secondary control air 7 must both be directed down with the same flow direction and into and through the upper upward flaming pyrolysis and combustion zone 16.

Incidentally, the pyrolysis zone 16 can ideally also be temperature-supplementally controlled via a direct injection of liquid. As a liquid injection will give an instantaneous temperature drop, and thereby less active combustion, as well as a change in the position and extent of the pyrolysis and combustion zone 16.

10

Via the lower part of the reservoir tube 18, which is particularly uninsulated here, there will be a heat transmission and an indirect cooling of the lower wood chips 3. Whereby this will cause the pyrolysis and combustion zone 16 to be stabilized upwards and where the flames will also indirectly be kept down to an appropriate controllable level.

Fig. 3 shows in detail section the tile magazine tube 18 surrounded by the exterior pyrolysis and combustion tube 19 according to the invention. It is observed here that a dimension change D1 <D2 at the top of the pyrolysis and combustion zone 16 is included. to act self-regulating and maintaining optimum pyrolysis level combustion.

By further conducting the "cure" 20 in ceramic material 25, the "radiation" from the constantly glowing ceramic hearth 20 also automatically stabilizes and regulates the optimal pyrolysis combustion 21 in one particular level range.

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Claims (8)

A method for optimal gasification (6) of wood chips (3) in particular, in particular a co-current generator (1), 5, characterized in that - on a gasification apparatus (1) in its pyro-light zone (5 as 16) is arranged a temperature level sensor (8) having multiple temperature level ranges (A, B and C). B. that the temperature level sensor (8) on the gasification apparatus (1) can continuously lower and adjust the pyrolysis and combustion temperatures, in particular keeping the exact bounded total pyrolysis zone area (5 as 16). C. that the exact, especially different, level temperatures (A, B and C) in the pyrolysis and combustion zone area (5 as 16) of the gasification apparatus (1) can be down-adjusted by, for example, cooling via injection of water which via changing a continuous supply of primary air (4) as via changing a simultaneous controlled supply of secondary air (7). 20 Apparatus (1) for carrying out the process for optimum gasification (6) of wood chips (3) according to claim 1, characterized in that they have means for combustion optimally when the pyrolysis zone (5) as the combustion zone 25 ( 16) is continuously influenced by, for example, an external suction pump on the gas collector (6), and that the primary air (4) as the secondary air (7) is both thereby forced and directed in the same flow direction and into the upper pyrolysis-as combustion zone (16). 30 DK 172277 B1 Apparatus (1) according to claim 2, characterized in that a suitable diameter transition (D1 to D2) or a plunger of the chip storage tube (18) to the larger diameter volume (19) of the combustion area is ideally adapted to act as a self-regulating device. , and that the combustion and pyrolyzone are optimally maintained in relation to the physical level range and propagation (21). Apparatus (1) according to claims 2 to 3, characterized by -10 characterized by a specific and well-defined thermal insulation between the gasification zones (16) and the surroundings, for example by establishing a substantial increase just after the generally insulated lower part of the tile magazine (18). of the insulation specifically in and on the pipe wall of the pyrolysis and combustion pipe itself (19). Apparatus (1) according to claims 2 to 4, characterized in that the apparatus (1) is provided with a further stabilizing and indirectly controlling element (20), ideally located between the gasification zone (16) and the surroundings, via a substantially thermal an insulating element, ideally an annular hearth (20), ideally, for example, made of refractory ceramic material, which, with a heat radiation from its glowing element (20) during the gasification process (21 as 6), can control and stabilize a continuously held and formed necessary "solid" transition between a pyrolysis zone (5) and a combustion zone (16). Apparatus (1) according to claims 2 to 5, known -30 DK 172277 B1 characterized in that an upscaled system (1) combustionally (21 as 6) can ideally also consist of several chips storage tubes (18) as one in vertical drum magazine (18 ') over a common hearth (20') with ideal ash holes out 5 for each chip tray (18). Apparatus (According to claims 2 to 6, characterized in that the exhaust gas such as the pyrolysis gas (6) can ideally be taken off and passed through several vertical pipe sections, where they are lowered against the hearth (20) and pyrolysis. and the combustion zone (16) can ideally be thermally insulated a distance up to about a level around the upper temperature sensor position (A) of the pyrolysis control. Apparatus (1) according to claims 2 to 7, characterized in that the generator (1) can ideally consist of an open inner chamber (2), upwards to the open an open chip magazine (18), and the lower part or part of the pressure side an explosion protection with water trap (17), ideally an automatic ash transport (10, 12, 14 and 15), which is also ideal with an automatic filling of liquid (13).