EP2486327A2

EP2486327A2 - Metering system, dense phase conveying system and method for supplying bulk material in powder form

Info

Publication number: EP2486327A2
Application number: EP10770997A
Authority: EP
Inventors: Horst Kretschmer; Jörg KLEEBERG; Dietmar Rüger; Olaf Schulze; Christian Eichhorn
Original assignee: Linde GmbH
Current assignee: Linde GmbH
Priority date: 2009-10-10
Filing date: 2010-10-08
Publication date: 2012-08-15
Also published as: RU2012117505A; US20120266966A1; IN2012DN03393A; WO2011042194A2; DE102009048961A1; DE102009048961B4; AU2010305044A1; CN102656408A; CL2012000911A1; WO2011042194A3; CN102656408B; CA2776548A1; RU2539406C2; US8899884B2

Abstract

The invention relates to a metering system and a dense phase conveying system for the metered supply of a light-weight bulk material from a supply device (B, SG) via conveying tubes (FR1,FR2,FR3) to a consumer. A sluice (S) comprises a discharge device (AE/S) having a powder flow control device (Fl4) which leads to a metering container (DB) the discharge device (AE/DB) of which comprises a plurality of powder flow control devices (Fl1,Fl2,Fl3) that lead to respective conveying tubes (FR1,FR2,FR3). A pressure control device of the metering device is coupled to pressure measuring devices (PIS1, PI2) of the sluice (S) and of the metering container (DB) for the purpose of differential pressure controls (PDC1-2, PDC3-R) and to pressure measuring devices (PIR, PI3) of the metering container discharge device (AE/DB) and the consumer to control the metering container pressure (Pl2) depending on the second differential pressure control (PDC3-R). The pressure control device is coupled to a pressure measuring device (PlSA4) of the supply device (SG,B) for the purpose of a differential pressure control (PlSA4-1) between the supply device (B, SG) and the sluice (S). The pressure control device controls the sluice pressure (PlS1) depending on a sluice fill level (LlS/S) and the differential pressure control (PlSA4-1) by activating at least one suction device (V) that can be connected to the sluice (S). The invention further relates to a method using the dense phase conveying system having the metering device.

Description

DOSING DEVICE, DENSITY TRANSFER SYSTEM AND METHOD FOR SUPPLYING DUSTED BULK GOODS

The following invention relates to a metering device and a dense phase conveying system for continuous, continuous, metered supply of a dusty bulk material of light, polydisperse particles to a downstream consumer. Furthermore, the invention relates to a method for the continuous, metered feeding of the powdery bulk material using the dense phase conveying system comprising the metering device according to the invention.

A system configuration of bunkers, locks, dosing and usually several parallel conveyor tubes that lead from the dosing to several dust burners for pneumatic thin and Dichtstromförderungs- systems for the supply of fuel dust in entrained flow gasification reactors or other consumer or reactor systems such as blast furnaces, cupolas etc. applied. In this case, the mass flow control takes place by means of the differential pressure between the metering and the reaction pressure in the consumer.

The total mass flow is determined by means of a weighing system on the dosing, the mass flows in the individual delivery pipes are determined from individual measurements of the flow density and the flow rate. Deviations of individual delivery pipes from the proportionate total mass flow are corrected by adding auxiliary gas to the delivery pipe. Such Brennstaubzuführsysteme, which are suitable for bulk materials with bulk densities above 450 kg / m ³ , are for example in DE 28 31 208, DE 32 1 045, DD 268 835, DE 10 2005 047 583 A1, DD 139 271 and K. Scheidig o. A. in "New hut" Leipzig, December 1983, p 441-442 described.

A continuous supply of light dusts that have bulk densities below 450 kg / m ³ , however, is not or only partially possible with the methods known from the prior art. Such light and in terms of particle shape polydispersed dusts arise in the thermal pretreatment of renewable, inherently light fuels such as wood, straw and other biomass. Thus, these renewable fuels can decompose into various forms in the thermal pretreatment by spontaneous drying, degassing or fission or in the hydrothermal carbonization of biomass, and gain a porous structure. The shape of the dust particles and the porous structure mean that these dusts have bulk density values of 150 to 400 (450) kg / m ³ and gap volumes of more than 94% of the bulk volume. A bulk density of 200 to 800 kg / m ³ decreases compared to the true density of 800 to 2,500 kg / m ³ . These light dusts no longer follow the flow of gravity when they flow out of containers such as bunkers or dosing containers, they become wedged and have only a very low flowability. Fluidization leads to strong vortexing and blowing away of this dust in front of the outlet openings as well as to strong dilution effects, in the end thus even to pure gas breakthroughs. However, the feeding of, for example, comminuted biomasses and cokes to a consumer is addressed in DE 10 2005 047 583 A1, which discloses a corresponding method and a device. In addition to pressure locks and a metering vessel, the device comprises a plurality of conveying tubes connected correspondingly to the consumer. There, the amount of dust flowing in the delivery lines to the consumer is measured and regulated by means of control valves, with discharge devices being provided for each delivery line. The differential pressure between the consumer and the dosing vessel should be recorded there to maintain a constant flow of dust.

Based on this prior art, the present invention, the object of providing a metering device that allows a continuous, metered supply of such dusty bulk material of light, polydisperse particles, regardless of which reaction pressure in a downstream consumer prevails and which is also suitable for retrofitting existing feed systems.

This object is achieved by a metering device with the features of the independent claim 1.

Another object of the invention is to provide a with respect to the supply of light dusts with bulk densities under 450 kg / m ³ improved and extended dense phase conveying system, which can be provided at the lowest possible cost for continuous and continuous dosing of light dusts.

This object is achieved by the dense phase conveying system with the features of Claim solved.

A method for the continuous and continuous metered feeding of these light dusts is disclosed with the features of claim 11.

Further developments of the objects of the invention are described by the subclaims.

A first embodiment of the invention relates to a metering device for the continuous, continuous, metered supply of a dusty bulk material of light, polydisperse particles having a void volume in a range up to 94% and a bulk density of 200 to 800 kg / m ³ , from a supply device such as a bunker or a central supply system into a plurality of delivery pipes leading to a downstream consumer. This metering device comprises a metering container and an upstream arranged lock. However, it can also be provided several locks that are supplied by the supply device with bulk material and promote this to the dosing. Both the dosing tank and the lock each have a discharge device, which ensures that the bulk material of light particles enters the metering continuously, and is metered from there distributed equally to the delivery pipes, the flow density of the dust flow at least at the beginning of the delivery pipes almost at Values of bulk density lie. For this purpose, the discharge device of the dosing container has a number of dust flow control devices corresponding to a number of the delivery pipes, each discharging into one of the delivery pipes. In addition, a mass flow measuring probe is arranged on each delivery pipe, which is coupled in each case with the dust flow control device, which opens into the corresponding delivery pipe. The steady entry of the bulk material from the lock into the metering container is secured by the discharge device of the lock, which opens into the metering container via a dust flow control device.

In order to keep the operating pressure for the continuous metering of the bulk material from the metering into the delivery pipes constant or depending on the desired flow rate in the individual tubes, which is adjustable by the pressure difference between the consumer and the dosing adjust, has Dosing preferably a pressure control device, which is operatively coupled to a plurality of pressure measuring devices. For the gelung the required for the flow rate flow pressure difference between dosing and consumer, the pressure control device is coupled to a pressure measuring device of the dosing, which is arranged at the discharge, and a Druckmesseinhchtung the consumer. In order to secure the continuous conveyance of the bulk material from the supply device into the lock and from the lock into the metering container, further pressure measuring devices of the supply device, the lock and the metering container are arranged, so that the differential pressure between the lock and the metering container by a Differential pressure control of the pressure control device can be controlled while the differential pressure between the supply device and the lock is controlled by the pressure control device. The lock pressure is controlled by the pressure control device depending on a Dosierbehälterfüllstand, a lock level, the differential pressure control between lock and dosing and the differential pressure control between the supply device and the lock by the pressure control device is coupled to one or more actuators to change the pressure in the lock. The respective pressure difference between supply device and lock, or between lock and metering determines the Befüliintensität or -geschwind ig speed. One of the actuators activates a suction device and opens fittings in the line from the lock to the suction device, whereby the lock pressure can be lowered.

Furthermore, the pressure control device can also activate the coupled dust flow control device of the lock discharge device as a function of the metering vessel and lock fill level and of the pressure difference between the lock and the metering container. The control or regulation of the Dosierbehälterdrucks turn and thus also the pressure difference between the lock and dosing, possibly also the lock pressure, depending on the differential pressure between the discharge of the dosing and the consumer, so that the discharge pressure in the discharge of the dosing or for the delivery mass flow responsible pressure difference to the consumer can be kept constant.

Thus, according to the invention, the pressure in the lock is controlled by the pressure regulating device as a function of a metering tank level, of a lock filling device. Stands and the pressure difference between dosing and sluice controlled, the lock is relaxed for filling with the bulk material and covered to promote the bulk material in the dosing against the dosing. The Dosierbehälteraustragsdruck to be set, which depends primarily on the consumer pressure and a pressure drop of the desired mass flow in the delivery pipes, which is why the pressure control device with the mass flow probes in the conveyor pipes or with a measuring device for the total mass flow, such as a weighing device of the dosing, operatively coupled Thus, the controlled variable of the pressure control device for the Dosierbehälterdruck and thus for the differential pressure between the lock and dosing is. With this metering device, it is possible to supply the bulk material of light particles in a metering, which is acted upon by operating pressure, so that a continuous metered delivery of the light, polydisperse dusts through the dust flow control devices into the production tubing to the consumer, which may be a reaction system of any pressure.

For this purpose, the pressure regulating device can actuate a plurality of control and shut-off valves in a stringing / compensating gas line, an expansion gas line and a fluidizing gas line or acceleration and discharge gas line, which open into the metering container, by means of corresponding actuating devices. A string gas is used to increase the pressure to operating pressure, expansion gas is released to reduce the pressure and the use of compensation gas serves for pressure stabilization and pressure regulation of the dosing tank. At the same time, the pressure control device controls the lock pressure, which varies depending on the lock level between a negative pressure relative to the supply device at a lock fill level minimum and an overpressure relative to the Dosierbehälterbetriebsdruck at a lock fill level maximum. In this case, the pressure control device can a plurality of control and shut-off valves in a string gas line, a flue gas line and a fluid gas line or accelerating and discharge gas line leading to the lock, and a suction device, such as a fan, which can be coupled via the expansion gas line with the lock is and which is suitable for generating a negative pressure in the lock against a pressure in the supply device, actuate by means of suitable actuators. The lock and the dosing can be connected via an openable by a closing device filling line. The closing device can be operated advantageously by a control device, which may be part of the pressure control device, depending on the lock pressure, the Dosierbehälterdrucks, the Dosierbehälterfüllstands and / or the lock level. This control device can also operatively couple the closing device with the dust flow control device of the lock, and thus provide a Befüllmassenstrom in the dosing, which depends on the levels in the dosing and the lock, but also on the Dosierbehälterdruck or the pressure difference between dosing and lock.

In one embodiment, the discharge of the dosing can be equipped with a fluidized bed, above which a stirring device is arranged. The acceleration and discharge gas line (fluid gas line) opens below the fluidized bed in the Dosierbehälter-discharge. Furthermore, each dust flow control device of the discharge device may comprise an associated closure device, and the dust flow control devices may be coupled to a pressure measuring device of the metering container and to a measuring device for a total mass flow, for example a weighing system.

The discharge of the lock may comprise in a further embodiment, a ventilation device such as a porous sintered metal tube, wherein the fluidizing gas line opens into the ventilation device. The ventilation device may be coupled to the pressure control device, and thus depending on the Dosierbehälter- and Schleusenfüllständen and the pressure difference between the lock and dosing or the lock pressure are activated when the dust is to take place from the lock into the dosing. In addition, the lock discharge device may have a closure device, which may also be coupled to the pressure control device, which may be arranged between the ventilation device and the dust flow control device or downstream of the dust flow control device in the filling to the dosing.

Both the dust flow control device of the lock and the dust flow control devices of the dosing can smooth and wear-resistant flow channel having an adjustable flap, which is actuated via a fine actuator, wherein the cross-section of the flow channel decreases steadily downstream.

A preferred arrangement of the compensation gas line on the dosing and the Bespannungsgasleitung at the lock can be performed horizontally in one embodiment, the Kompensationsgasleitung above an existing over the fluidized bed dust in the dosing and the Bespannungsgasleitung above the over the discharge or the ventilation device existing dust fill open into the lock, so that a compensation gas and a stringing gas can be introduced diffusely distributed and thereby only minimally swirl the dust of the bed.

Another object of the invention relates to an embodiment of a dense phase conveying system for continuous, continuous, metered supply of a dusty bulk material of light, polydisperse particles. Such a dense phase conveying system comprises a supply device, for example a bunker, a metering device according to the invention, which contains a metering container and at least one lock, each with a discharge device, and delivery pipes. In this case, the bunker is connected to the lock of the metering device, and the delivery pipes extend from the metering container to a consumer.

The bunker has a ventilation element and a Bunkeraustragseinrichtung, which is connected via a closable filling line with the lock. Both the ventilation element, as well as the Bunkeraustragseinrichtung and the filling line can be coupled to the pressure control device for controlled filling of the lock from the bunker, while a filling of the bunker from the bulk material supply is bunkerfüllstandsgesteuert. If there are several locks, a corresponding number of bunker discharge devices can also be provided. Thus, an existing conveyor system for the dense phase conveying system according to the invention can be retrofitted by one or more locks are interposed between the supply device and the metering, and bunker and metering be retrofitted with the corresponding discharge devices. The pressure control device according to the invention is coupled to the suction device, which may be a fan, for example, to the lock and the control device of Dosiervorrich- tion is integrated.

To provide the negative pressure in the lock against a pressure in the supply device, the dense phase conveying system comprises the suction device, which may be a ventilation device and connected in dependence of a Schleusenfüllstands with the lock and operated by the pressure control device.

An inventive method for continuous, continuous, metered feeding a dusty bulk material of light, polydisperse particles can be performed using a dense phase conveying system according to the invention by a coupled, coordinated operation of the lock and the dosing of the metering device. The lock and the dosing are controlled in response to the lock level and the Dosierbehälterfüllstands with bulk material alternately and successively acted by the lock when the bulk material reaches a minimum level, relaxed and subjected to a negative pressure relative to the supply device by the ventilation device in operation is set so that the bulk material is transferred into the lock until a maximum fill level is reached, so that appropriate fittings are closed to the supply device and the ventilation device and in the string gas line and / or the acceleration / discharge gas line (fluid gas line) be opened, so that the lock with stratified gas and / or fluidizing gas is subjected to an overpressure relative to the operating pressure of the dosing. Thus, the lock is ready for filling the dosing. This takes place when the bulk material in the dosing tank reaches a minimum level, whereupon the control device operatively coupled opens the closing device of the filling between the acted upon with the overpressure and fully filled lock and the dosing, and controlled the dust flow control device of the lock and so a steady Befüllmassenstrom in the Dosing container provides.

By reaching a maximum level in the dosing the closing device of the filling is closed by the control device again and the lock can be relaxed again for refilling.

[00026] Are several locks between supply device and metering device switched container to handle larger dosing also continuously, they can alternately fill the dosing and self-filling.

Advantageously, this method allows the discharge pressure in the dosing can be kept constant during normal dosing and during filling and thus conveying the bulk material in the delivery pipes and a constant maintenance of the mass flows in the delivery pipes with a stable differential pressure between dosing and Consumers and / or is achieved with the dust flow control devices of the dosing and thereby the continuous, continuous, metered supply to the consumer is provided. The measurement of the Dosierbehälteraustragsdrucks in the discharge and the dependent therefrom, especially during the filling process from the lock required readjustment of Dosierbehälterdrucks, allow a steady and error-free dosage. The change in the hydrostatic pressure in the dosing container caused by the filling process and the filling level decrease during metering advantageously has no effect on the discharge pressure which provides the constant mass flow to the consumer when the pressure measuring device for the dosing container discharge pressure is installed on the dispensing device of the dosing container and is coupled to the pressure control device for readjusting the Dosierbehälterdrucks.

The present invention thus offers the advantages that the continuous flow of dust from the bunker to the lock, from the lock to the metering container and at its outlet to the delivery pipes is brought about by forced flow forces with pressure differences and with aeration of the bulk material, because of the gravity flow the low scoring and gross density values is insufficient. Furthermore account for the use of flow forces large inlet and outlet cross sections on the bunker, on the locks and on the dosing and thus large high-pressure ball valves / fittings. The invention also enables continuous dust extraction of light bulk materials after an easy conversion in existing plants.

These and other advantages will be set forth by the following description with reference to the accompanying drawings.

The reference to the figures in the description serves to support the Description. Articles or parts of objects which are substantially the same or similar may be given the same reference numerals. The figures are merely schematic representations of embodiments of the invention. It shows:

1 is a process flow diagram of an embodiment of the dense phase conveying system according to the invention,

2 shows a schematic detail of the discharge device of the bunker,

3 is a schematic detail of the discharge of the lock,

Fig. 4 is a schematic detail of the discharge of the dosing.

The inventive method provides using a dense phase conveying system according to the invention with metering the continuous, metered feeds of light, polydisperse dusts in gasification reactors, but also in other reaction spaces arbitrary operating pressure such. B. blast furnaces, cupolas ready.

The dust is fed to a bunker, from there one or more locks and a dosing from a central deposit such as a dryer, Schweler / degasser by means of pneumatic or mechanical conveyor. When being fed into the bunker, a negative pressure is imposed on the bunker by means of a fan / suction filter in order to remove the introduced carrier gas from the dust stream. The filling of the lock is not done by gravity flow, but with the help of flow forces that are initiated by applying a negative pressure in the lock against the bunker with the fan / suction filter.

The otherwise usual, necessary pressure equalization in the gravity flow is bypassed and is replaced according to the invention by a combination of a ventilation device on the bunker outlet and a discharge after bunker outlet. The aerator is provided by a vault-like arrangement of porous sintered metal tubes. The discharge device is Preferably, a throttle device such as a Schrägsitzarmatur, rotary valve, or rotary valve, which prevents the breakthrough of gas. After an emptying of the lock their relaxation and the generation of a negative pressure relative to the pressure in the bunker by means of a suction device such as a fan done. Due to the differential pressure between the lock and bunker, the filling of the lock with bulk material takes place up to a maximum level of the lock. Then, the lock is covered with a slight overpressure relative to the Dosierbehälterdruck, so that the differential pressure between the lock and dosing causes flow compulsion for the bulk material in the direction of the dosing. The filling of the dosing with the dust from the lock, which is filled as described to maximum level and covered at least to the Dosierbehälter operating pressure is requested by the minimum level detector of the dosing.

The filling of the metering container according to the invention now comprises in detail a slight aeration of the lock with the aeration device of the lock discharge device and the adjustment and regulation of an overpressure in the lock relative to the metering by exposure to stringing gas or acceleration / discharge gas. Then, the opening of the dust flow control unit of the lock and the opening of the closure device under the lock, which may be a ball valve, whereby the degree of opening of the Staubfluss- control unit results from the necessary refill time. A Befüllmassenstrom in the dosing can be set much larger than the flow to the consumer, but it can also be limited when the filling increases the pressure in the dosing tank above the setpoint of Dosierbehälterdruckes. The overpressure in the dosing tank caused by the refill driven by the lock overpressure is reduced with the differential pressure control between the lock and dosing tank by the pressure regulating device by opening corresponding control valves in the expansion gas line of the dosing tank and the relaxing gas is discharged via a pressure filter, so that the dosing tank discharge pressure for the constant mass flow control is ensured.

The pressure measuring probe for the metering vessel discharge pressure is therefore arranged in the region of the discharge device for the purpose of eliminating the variable hydrostatic pressure of the metering vessel charge. Thus, the pressure required in the lock for refilling the metering container from the lock against above the dosing to allow a dust flow to use, can not move into the dosing to the discharge into it, and thereby may cause a deviating from the setpoint for the total mass flow control Dosier- container discharge pressure, occurring in the dosing by the refilling pressure increase of the Pressure control device rapidly degraded by rapid readjustment of Dosierbehälterdrucks by a pressure increase corresponding gas flow is allowed to escape through the expansion gas line, for example by opening a large control valve.

By this method, the continuous metered delivery of dusts easily polydisperse particles in reactors of any operating pressure can be performed, these dusts are easily flowed through because of their large void volume over 94% and their particles because of the low density of 200 - 800 kg / m ^{3 have} a slight tendency to float, so far in the prior art due to the low gravitational pressure and the easy Teilchenverkeilbarkeit hardly or no bulk flow was to achieve from discharge openings.

Referring to Fig. 1, such a method can be performed by using a bunker B with a discharge device AE / B, a lock S with a discharge device AE / S and with a dosing DB with a discharge device AE / DB. Above the discharge device AE / B, aeration of the Bunkerschüttung by means of an acceleration and discharge gas BAG1 on the ventilation elements BE / SiR (see Fig.2) introduced, while in the lock S to be filled with open valves KH12, KH13, KH16, RV17 a negative pressure with the fan V, which includes a filter F1 for entrained dust, is created for the purpose of generating a bulk flow to the lock S out.

After reaching the maximum level LIS + / S in the lock S said fittings are closed again and the filled lock S on the pressure prevailing in the dosing DB operating pressure PI2 by means of covering gas BG by opening the control valve RV2, but mainly with acceleration / Austra- BAG2 brought. Thereafter, by further addition of gas, an overpressure corresponding to the differential pressure PDC 1-2 = PIS1 - PI2 is set and controlled in the lock S with respect to the metering container DB, so that the ball valve KH14 opens after reaching the minimum fill level LIS / DB at the metering container DB and the dust flow regulating device FI4, for example, a FLUSOMET ^® - can be control unit are balanced to define the filling to the dosing DB, to set in motion that upon reaching the maximum level

LIS + / DB of the dosing tank DB is interrupted again by closing the ball valve KH14. The discharged with the exhaust gas from the dosing DB solid is retained in the filter F2 to protect the pressure relief valves, for example, the control valve RV19.

The mass flow control is carried out with a variable differential pressure PDC 3-R between dosing PI3 and PIR reactor and controllable opening degrees of dust flow control devices FI1, FI2, FI3, which may be FLUSOMET ^® - control units, wherein the mass flow increase the compensation gas KG to Dosing container DB toward increases and the mass flow reduction, the expansion gas EG is increased from the dosing container DB via the pressure filter F2.

Before entering the delivery pipes FR1, FR2, FR3, the dust in the discharge AE / DB is slightly ventilated, homogenized and metered.

At higher operating pressures, the discharged from the lock S expansion gas can be collected and recompressed again used as working gas BG, SpG, BAG2, BAG3, in which case at least two locks S must be installed.

For the monitoring of the level LIS of the dosing DB and the measurement of the total mass flow, which is composed of the sum of the individual mass flows in the delivery pipes FR1, FR2, FR3, a weighing system W can be used. It is possible that in each delivery pipe FR1, FR2, FR3 by means of the dust flow control devices FI1, FI2, FI3 at the same time a different but defined mass flow FIC1, FIC2, FIC3 can be adjusted by the degrees of opening of the dust flow control devices FM, FI2, FI3 be changed, but the differential pressure PDC3-R between dosing tank DB and the reactor is kept stable and constant.

[00047] FIG. 2 shows that the bunker B at the outlet has ventilation devices BE / SiR which consist of porous sintered metal tubes shaped like arched ones. hen, and discharge devices AE / B, the throttles as oblique seat fittings SS-A, rotary valves DK may be ZRS may be cellular wheel locks owns. Also, the lock S, shown in Fig. 3, is equipped in the outlet with aerators BE / SiR from vault-like shaped, porous sintered metal tubes and with the dust flow control device FI4 for outflow control.

The discharge device AE / DB of the dosing container DB is illustrated in FIG. 4 and comprises a fluidized bed WB for fluidization, a stirrer RW for bulk material homogenization, the dust flow control device FI1, FI2, FI3 for mass flow regulation in the single tube, which together with the respective mass flow Measuring probes FIC1, FIC2, FIC3 in the conveying pipes FR1, FR2, FR3 takes place (see Fig. 1), a control valve RV (RV5 in Fig. 1) for the fluidizing gas amount addition to the fluidized bed WB and a pressure measuring point PI3 for controlling the Dosierbehälterdrücke when stringing, dosed conveying and relaxing. Each mass flow measuring point forms a mass flow control path with a dust flow control device in the same feed line. The number of parallel delivery pipes corresponds to the number of dust flow control devices under the metering tank DB. Each dust flow control device has an adjustable damper with a fine actuator, and its free flow channel is steadily decreasing downstream, is smooth and wear resistant, and offers no possibility of wedging and swirling to the solids flow.

In general, the clothing and compensation gases can be introduced horizontally to the lock and to the metering container and diffusely distributed and fed as far as possible above the beds, so that no intensive turbulence at a speed of more than 0.01 m / s and no jet formation into the bed at a speed higher than 0.5 m / s.

In the present case, a metering container is sufficient for delivery to the consumer. From the metering open one or more delivery pipes, which extend to the consumer. The promotion of the dust from the dosing to the consumer is activated and maintained by a discharge on the Dosierbehälterunterteil from a fluidized bed for fluidization, from a stirrer for bulk material or gas mixing, from a dust flow control device, in particular from a FLUSOMET ^® control unit for mass flow control in the single pipe as well as for the adjustment of the dust flows of the conveying to each other, consists of a control valve for the acceleration / Austragsgas- quantity (fluidizing gas) at the fluidized bed and from pressure measuring points for the regulation of Dosierbehälterdrücke during stringing, metered conveying and relaxing.

[00051] The mass flow measuring probes into the production tubing and the FLUSOMET ^® - control units on Dosierbehälterauslauf together mass flow control loops. Depending on the degree of opening of the FLUSOMET ^® control unit, a driving pressure difference is caused between the dosing tank and the delivery pipe to drive the dust flow out of the dosing tank. By contrast, a too large when coasting mouth and too large a degree of opening of the lock FLUSOMET ^® for pure gas breakthrough and thus to equalize the pressure between airlock and metering. The dust replenishment collapses with it, which is prevented by throttling at the lock discharge unit.

The fluidizing gas velocity on the fluidized bed is set between the 0.1 to 1, 0 times the gas velocity at the loosening point. This low speed should not be exceeded, so that too little turbulence of the light, small particles is caused. The gas velocity at the loosening point of the dusts treated here is less than 0.01 m / s.

An embodiment described below with reference to Figures 1 to 4 is intended to illustrate the invention, but not limit the scope.

An entrained flow gasification reactor R is charged with three equal production pipes FR1, FR2, FR3 with a total of 2500 kg / h biocoks. At a bulk density of 340 kg / m ³ , the biokoksstrom corresponds to a bulk material volume flow of 7.35 m ³ / h. The operating pressure Pl-R in the reactor is 5 bar and is always constant, ie Pl-R is the reference pressure of the system.

The gross volume of the metering container DB is 6.0 m ³ , that of the lock S4.0 m ³ and that of the bunker B 80 m ³ . The number of lock plays to the dosing tank DB is approx. 2.5 / h, whenever the refilling to the dosing tank DB starts at a minimum fill level LIS / DB of 25% and is terminated at a maximum fill level LIS + / DB 75%, which corresponds to the net volume of the lock S corresponds.

The bulk material or the dust SG is pneumatically conveyed by a degassing in the bunker B. The conveying gas is discharged to the filter F1, the dust is vented and settles in the bunker B. The dust supply is controlled with the MIN / MAX level monitor LIS of bunker B.

If the level probe of the lock S the level minimum LIS- / S, then the lock S on the fittings KH16 and RV17 totally relaxed and refilled via the rotary flap DK of the discharge AE / B. Prior to this refilling, the dust is loosened slightly with the aerator BE / SiR above the AE / B with accelerating / discharging gas BAG1, the sluice S is forced by a negative pressure with the fan filter V, F1, the rotary damper DK partially opened according to the necessary outlet flow and the discharge started with the opening of the ball valves KH 2 and KH13.

Upon reaching the maximum level LIS + / S in the lock S close all fittings to the vicinity of the lock S and the bunker B back, i. Close valves KH12, KH13, KH16, RV17 and fan V switches off. The lock S is immediately brought to the pressure PI-2 with gas string BG, but mainly with acceleration / discharge gas BAG2, as it is present in the dosing container DB. The supply of the stringing gas BG takes place horizontally and above the dust fill in the lock.

With the attainment of the level in the dosing DB of LIS / DB 25% is the request for dust from the lock S. By means of stringing gas BG, and opening the control valve RV2, the lock pressure PIS-1 by at most 1, 0 bar compared to Dosierbehälterdruck PI 2 raised and kept constant with the control PDC1-2; However, the lock pressure PIS-1 can also be lowered via the control valve RV17 with the control PDC1-2 during the refilling process into the dosing tank DB with the ball valve KH14 open. The FLUSO- MET ^® FI4 regulating unit of the discharge AE / S opens to such an extent that the necessary effluent stream is achieved by opening of the KH14 and kept stable. During refilling into the dosing tank, a volume corresponding to the incoming dust and gas volume, expansion gas EG is discharged from the dosing tank DB with the control PDC 3-R via the control valve RV19 so the dosing tank pressure PI2 and the lock pressure PIS-1 do not equalize. The outlet into the dosing tank DB would then come to a standstill. At fill level LIS / DB of 75% in the dosing tank DB, the lock S is decoupled from the dosing tank DB, expanded and refilled.

The metering container DB conveys without interruption, continuously with at least 0.5 bar pressure PDC 3-R by means of the three delivery pipes the dust to the burners of the gasification reactor R. The consistency and accuracy of the metering is achieved with the discharge AE / DB, by homogenizing the dust with the stirrer RW, admixing the accelerating / discharging gas BAG3 by opening the control valve RV5 and with the FLUSOMET ^® control units FI1, FI2, FI3 in combination with the dust flow measuring points FIC-1, FIC-2, FIC -3 are regulated to the same dust flows. The differential pressure PDC 3-R between dosing tank DB and consumer R is kept constant during the metering to the value that is necessary for the total mass flow, by the differential pressure control PDC3-R with compensation gas KG via actuation of the control valve RV4. However, it is at a level that allows the FLUSOMET ^® control units to increase or decrease the mass flows in the individual delivery pipes by increasing or decreasing their opening degree. The magnitude of the differential pressure PDC 3- R depends on the size of the total mass flow and on the length of the delivery pipes FR1, FR2 and FR3. The supply of compensation gas KG into the dosing tank takes place horizontally and above the dust fill.

The function of the level probe of the dosing LIS / DB can also be taken over or supported by the weighing device W or the weighing device W can be used as a donor of a redundant measurement signal, if no clear level measurement signal can be imaged in difficult dust parameters. LIST OF REFERENCE NUMBERS

SG dust, bulk goods, supply equipment

B bunker, supply facility

S lock

DB dosing tank

F filter

V fan, suction device

BE ventilation element

AE discharge device

AA shut-off valve, slide

RV control valve

KH ball valve

RüA non-return valve

DM pressure reducer

SV safety valve, overpressure protection

Fl dust flow control device, FLUSOMET ^® control unit Measuring points:

L: level, F: volume / mass flow,

P: pressure, PD: differential pressure, W: weighing

DK Rotary flap for gas or solids flow control

PG pulse gas for filter cleaning

EC expansion gas (pressure reduction)

BG / KG stringing / compensating gas (pressure increase) SpG Flushing or conveying gas

BAG acceleration / discharge gas

FAG fluidizing / discharge gas

FR dust pipe

ZRS rotary valve

SS-A angle seat fitting

SiR sintered metal tube for bulk material aeration

WB fluidised bed (fluidizing device)

RW stirrer

R reactor, consumer

Claims

CLAIMS . Dosing device comprising a dosing tank (DB) and at least one upstream sluice (S) for the continuous, continuous, metered supply of a dusty bulk material of light, polydisperse particles from a supply device (B, SG) into a plurality of delivery pipes (FR1, FR2, FR3) .to a downstream consumer, wherein the metering container (DB) and the lock (S) each comprise a discharge device (AE / DB.AE / S),

and wherein a mass flow measuring probe (FIC1, FIC2, FIC3) is arranged on each conveying tube (FR1, FR2, FR3) and the metering device has a pressure regulating device for regulating a differential pressure between the metering container (DB) and the consumer,

characterized in that

the discharge device (AE / DB) of the metering container (DB) comprises, for each of the delivery tubes (FR1, FR2, FR3), a dust flow control device (FI1, FI2.FI3) associated therewith and opening into the delivery tube (FR1, FR2, FR3),

wherein the mass flow measuring probe (FIC1, FIC2, FIC3) is coupled to the dust flow control device (FI1, FI2, FI3), which opens into the corresponding delivery pipe (FR1, FR2, FR3), and

- The discharge device (AE / S) of the lock (S) via a dust flow control device (FI4) in the dosing (DB) opens,

wherein the pressure regulating device

- For a first differential pressure control (PDC1-2) between a sluice pressure (PIS1) and a Dosierbehälterdruck (PI2) at least one of the lock (S) associated pressure measuring device (PIS1) and a to the dosing (DB) arranged pressure measuring device (PI2) is coupled .

- For a second differential pressure control (PDC3-R) between a Dosier- container discharge pressure and a consumer pressure with one of the discharge (AE / DB) of the dosing (DB) associated pressure measuring device (PI3) and a pressure measuring device (PIR) of the consumer is coupled to the Control of the differential pressure between the metering container (DB) and the consumer comprises, wherein the pressure control device controls the Dosierbehälterdruck (PI3) in dependence on at least the second differential pressure control (PDC3-R), and wherein the pressure control device

- For a first differential pressure control (PISA4-PIS1) between a supply device pressure (PISA4) and the lock pressure (PIS1) with a supply device (SG, B) associated pressure measuring device (Pl- SA4) and the pressure measuring device (PIS1) of the lock (S) coupled is and

- controls the lock pressure (PIS1) as a function of at least one lock fill level (LIS / S) and the first differential pressure control (PISA4-PIS1) by actuating at least one suction device (V) which can be coupled to the lock (S).

2. Metering device according to claim 1,

characterized in that

the lock (S) and the metering container (DB) are connected via a filling line, which has a closing device (KH14) which at least depends on the lock pressure (PIS1), a metering vessel pressure (PI2), the Dosierbehälterfüllstands (LIS / DB) and / or the lock level (LIS / S) is actuated.

3. Metering device according to claim 2,

characterized in that

the closing device (KH14) and the dust flow control device (FI4) of the lock (S) are operatively coupled to one another via a control device, wherein a filling mass flow into the metering container (DB) as a function of the metering tank level (LIS / DB), the lock level (LIS / S) and / or the pressure difference (PDC1-2) is provided.

4. Metering device according to at least one of claims 1 to 3,

characterized in that

the pressure control device

- a plurality of control and shut-off valves in a string gas line (KG), an expansion gas line (EG) and a fluidized gas line (BAG3) to the dosing (DB) operated,

- a plurality of control and shut-off valves in a bespan- gas (BG), a flue gas line (EG) and a fluidized gas line (BAG2) to the lock (S) and with the lock (S) via the expansion gas line (EG) connected to the suction device (V), and with

- the mass flow measuring probes (FIC1, FIC2, FIC3) and / or

- a measuring device for the total mass flow (W)

operatively linked.

Dosing device according to at least one of claims 1 to 4,

characterized in that

the discharge device (AE / DB) of the dosing tank (DB)

- a fluidized bed (WB) and a above the fluidized bed (WB) arranged stirring device (RW), wherein the fluid gas line (BAG3) below the fluidized bed (WB) in the discharge device (AE / DB) opens, and

- a dust flow control devices (FI1, FI2, FI3) associated plurality of closure devices (KH9, KH10, KH11), wherein the dust flow control devices (FI1, FI2, FI3) with the pressure measuring device (PI3) of the discharge (AE / DB) and with a Measuring device for a total mass flow (W) are coupled.

Dosing device according to claim 4 or 5,

characterized in that

the discharge device (AE / S) of the lock (S) comprises a ventilation device (BE / SiR) into which the fluidized gas line (BAG2) opens, and the closure device (KH14) arranged upstream or downstream of the dust flow control device (FI4), wherein at least the Ventilation device (BE / SiR) is coupled to the pressure control device.

Dosing device according to at least one of claims 1 to 6,

characterized in that

the dust flow control device (FI1, FI2, FI3.FI4) has a smooth and wear-resistant flow channel with an adjustable flap with a fine actuator, wherein the flow channel is continuously downstream. Ringert.

8. Metering device according to at least one of claims 5 to 7,

characterized in that

the compensation gas line (KG) horizontally so above a above the fluidized bed (WB) existing dust in the dosing (DB) and the Bespannungsgasleitung (BG) horizontally above a above the discharge (AE / S) existing dust fill in the lock (S) open in that a compensation gas and a covering gas can be introduced in a diffused manner.

9. Metering device according to at least one of claims 1 to 8,

characterized in that

the light, polydisperse particles have a void volume in a range of up to 94% and a bulk density of 200 to 800 kg / m ³ .

10. dense phase conveying system for the continuous, continuous, metered supply of a dusty bulk material of light, polydispersed particles, comprising a bunker (B), a metering device and delivery pipes (FR1, FR2, FR3), wherein the bunker (B) is connected to the metering device, from which the delivery pipes (FR1.FR2.FR3) extend to a consumer,

characterized in that

the metering device is a metering device according to at least one of claims 1 to 9,

- The bunker (B) comprises a ventilation element (BE) and at least one Bunkeraustragseinrichtung (AE / B), which is connected via a filling line with at least one closure device (KH12, KH13) with the lock (S), wherein at least the Bunkeraustragseinrichtung with the Pressure control device is coupled, and

- The dense stream conveying system comprises the suction device (V), which is connected to the lock (S) via the expansion gas line (EG), wherein the suction device (V) in response to the lock level (LIS / S) is actuated by the pressure control device and a lock pressure ( PIS1) which is lower than a pressure in the bunker (B).

11. A method for the continuous, continuous, metered feeding of a dusty bulk material of light, polydispersed particles using a dense phase conveying system according to claim 10 with a supply device (B, SG), a metering device according to at least one of claims 1 to 9 and with delivery pipes (FR1, FR2, FR3) to a downstream consumer, by a coupled, coordinated operation of the lock (S) and the metering container (DB) of the metering device,

in which

the at least one lock (S) and the metering container (DB) controlled in response to the lock level (LIS / S) and the Dosierbehälterfüllstands (LIS / DB) with bulk material alternately and successively acted upon by the lock (S)

- When reaching a minimum level (LIS- / S) of the lock (S) with a negative pressure relative to the supply device (B, SG) is acted upon by actuation of the suction device (V) for filling with bulk material, and

- At a fill level maximum (LIS + / S) of the lock (S) with stringing gas from the string gas line (BG) and / or fluidized gas from the fluidizing gas line (BAG2) with an overpressure against the operating pressure (PI2) of the dosing (DB) is applied,

and by the filling mass flow into the dosing tank (DB)

- Upon reaching a minimum level (LIS- / DB) of the dosing (DB) from the pressurized with the pressure lock (S) by opening the closing device (KH14) of the filling between the lock (S) and the dosing (DB) and by a via the control device operatively coupled actuation of the dust flow control device (FI4) of the lock (S) is provided controlled.

12. The method according to claim 11,

in which

the closing device (KH14) closes the filling line when a maximum fill level (LIS + / DB) of the dosing tank (DB) is reached.

13. The method according to claim 11 or 12, in which

the differential pressure (PDC 3-R) between the discharge pressure (PI3) in the discharge device (AE / DB) of the metering container (DB) and the consumer pressure (PIR) is kept constant during filling, and the individual mass flows (FIC1, FIC2, FIC3) in the conveying pipes (FR1.FR2, FR3) are regulated by the dust flow control devices (FI1, FI2, FI3) of the dosing tank (DB), wherein the continuous, continuous, metered supply to the consumer is provided.