EP2486327A2 - Dispositif de dosage, installation de transport à écoulement dense et procédé d'alimentation en matériau pulvérulent en vrac - Google Patents

Dispositif de dosage, installation de transport à écoulement dense et procédé d'alimentation en matériau pulvérulent en vrac

Info

Publication number
EP2486327A2
EP2486327A2 EP10770997A EP10770997A EP2486327A2 EP 2486327 A2 EP2486327 A2 EP 2486327A2 EP 10770997 A EP10770997 A EP 10770997A EP 10770997 A EP10770997 A EP 10770997A EP 2486327 A2 EP2486327 A2 EP 2486327A2
Authority
EP
European Patent Office
Prior art keywords
lock
pressure
metering
dosing
discharge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10770997A
Other languages
German (de)
English (en)
Inventor
Horst Kretschmer
Jörg KLEEBERG
Dietmar Rüger
Olaf Schulze
Christian Eichhorn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Linde GmbH
Original Assignee
Linde GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Linde GmbH filed Critical Linde GmbH
Publication of EP2486327A2 publication Critical patent/EP2486327A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/72—Other features
    • C10J3/723—Controlling or regulating the gasification process
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/46—Gasification of granular or pulverulent flues in suspension
    • C10J3/48—Apparatus; Plants
    • C10J3/50—Fuel charging devices
    • C10J3/503—Fuel charging devices for gasifiers with stationary fluidised bed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
    • F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/10—Charging directly from hoppers or shoots
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/30—Conveying materials in bulk through pipes or tubes by liquid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/40—Feeding or discharging devices
    • B65G53/46—Gates or sluices, e.g. rotary wheels
    • B65G53/4691—Gates or sluices, e.g. rotary wheels of air-lock type, i.e. at least two valves opening asynchronously
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2200/00—Details of gasification apparatus
    • C10J2200/15—Details of feeding means
    • C10J2200/152—Nozzles or lances for introducing gas, liquids or suspensions
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/001—Injecting additional fuel or reducing agents
    • C21B5/003—Injection of pulverulent coal
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/02—Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals
    • C21B5/023—Injection of the additives into the melting part
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/527—Charging of the electric furnace
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • F27D2099/0051—Burning waste as a fuel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/0318—Processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/85938—Non-valved flow dividers

Definitions

  • 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 Dichtstrom foundeds- 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.
  • 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 Brennstaubzuditesysteme 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. Schomme 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 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.
  • 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.
  • 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.
  • 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.
  • the device comprises a plurality of conveying tubes connected correspondingly to the consumer.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • Dosing preferably a pressure control device, which is operatively coupled to a plurality of pressure measuring devices.
  • 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.
  • the respective pressure difference between supply device and lock, or between lock and metering determines the Be Scholiintenstician 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.
  • 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 Dosier deviser horrs 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.
  • 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 Dosier spasier experiments sakestragstik 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
  • the controlled variable of the pressure control device for the Dosier constitutionerdruck and thus for the differential pressure between the lock and dosing is.
  • 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.
  • 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
  • the use of compensation gas serves for pressure stabilization and pressure regulation of the dosing tank.
  • 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 Dosiermicer horrsdruck at a lock fill level maximum.
  • 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 Dosier practicalerdrucks, the Dosier inherenterhellstands 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 Behellmassenstrom in the dosing, which depends on the levels in the dosing and the lock, but also on the Dosier conceptionerdruck or the pressure difference between dosing and lock.
  • 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 Dosier disposer-discharge.
  • 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 Dosier disposer- and Schleusen Stahln 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.
  • 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 Beêtsgastechnisch at the lock can be performed horizontally in one embodiment, the Kompensationsgastechnisch above an existing over the fluidized bed dust in the dosing and the Beêtsgastechnisch 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.
  • 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.
  • 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 Bunkeraustrags adopted, which is connected via a closable filling line with the lock. Both the ventilation element, as well as the Bunkeraustrags owned 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 bunker satinsteil. If there are several locks, a corresponding number of bunker discharge devices can also be provided.
  • 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.
  • the dense phase conveying system comprises the suction device, which may be a ventilation device and connected in dependence of a Schleusen spallstands 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 Dosier umaneryogllstands 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.
  • 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 Be Shellmassenstrom in the Dosing container provides.
  • the closing device of the filling is closed by the control device again and the lock can be relaxed again for refilling.
  • 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 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 Dosier psychologyer horrs.
  • 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.
  • 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.
  • 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.
  • the lock is covered with a slight overpressure relative to the Dosier constitutionerdruck, 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 Dosier disposer 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 Staubiser- control unit results from the necessary refill time.
  • a Beglallmassenstrom 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 Dosier studyinger horres.
  • 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.
  • 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.
  • aeration of the Bunker mixtureung by means of an acceleration and discharge gas BAG1 on the ventilation elements BE / SiR 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.
  • 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.
  • the dust in the discharge AE / DB is slightly ventilated, homogenized and metered.
  • 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.
  • a weighing system W 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.
  • 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 Dosier matterserdrücke 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.
  • 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.
  • 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 Dosier electerunterteil 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 Dosier electerd Wege during stringing, metered conveying and relaxing.
  • 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 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.
  • 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.
  • 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.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)

Abstract

L'invention concerne un dispositif de dosage et une installation de transport à écoulement dense pour l'alimentation dosée d'un consommateur en matériau léger en vrac provenant d'un dispositif d'alimentation (B,SG) par l'intermédiaire de tuyaux de transport (FR1,FR2,FR3). Un sas (S) comporte un dispositif de déversement (AE/S) doté d'un dispositif de régulation d'écoulement pulvérulent (FI4) qui débouche dans un récipient de dosage (DB) dont le dispositif de déversement (AE/DB) comprend plusieurs dispositifs de régulation d'écoulement pulvérulent (FI1,FI2,FI3) qui débouchent chacun dans un tuyau de transport (FR1,FR2,FR3). Un dispositif de régulation de pression du dispositif de dosage est couplé, pour des régulations de pression différentielle (PDC1-2, PDC3-R), à des dispositifs de mesure de pression (PIS1,PI2) du sas (S) et du récipient de dosage (DB) et à des dispositifs de mesure de pression (PIR, PI3) du dispositif de déversement du récipient de dosage (AE/DB) et du consommateur, afin de commander la pression du récipient de dosage (PI2) en fonction de la deuxième régulation de pression différentielle (PDC3-R). Pour une commande de pression différentielle (PISA4-1) entre le dispositif d'alimentation (B,SG) et le sas (S), le dispositif de régulation de pression est couplé à un dispositif de mesure de pression (PISA4) du dispositif d'alimentation (SG,B). Le dispositif de régulation de pression commande la pression du sas (PIS1) en fonction d'un niveau de remplissage du sas (LIS/S) et de la commande de pression différentielle (PISA4-1) par actionnement d'au moins un dispositif d'aspiration (V) pouvant être relié au sas (S). L'invention porte également sur un procédé mettant en oeuvre l'installation de transport à écoulement dense avec le dispositif de dosage.
EP10770997A 2009-10-10 2010-10-08 Dispositif de dosage, installation de transport à écoulement dense et procédé d'alimentation en matériau pulvérulent en vrac Withdrawn EP2486327A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910048961 DE102009048961B4 (de) 2009-10-10 2009-10-10 Dosiervorrichtung, Dichtstromförderanlage und Verfahren zum Zuführen von staubförmigen Schüttgut
PCT/EP2010/006150 WO2011042194A2 (fr) 2009-10-10 2010-10-08 Dispositif de dosage, installation de transport à écoulement dense et procédé d'alimentation en matériau pulvérulent en vrac

Publications (1)

Publication Number Publication Date
EP2486327A2 true EP2486327A2 (fr) 2012-08-15

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Country Status (10)

Country Link
US (1) US8899884B2 (fr)
EP (1) EP2486327A2 (fr)
CN (1) CN102656408B (fr)
AU (1) AU2010305044A1 (fr)
CA (1) CA2776548A1 (fr)
CL (1) CL2012000911A1 (fr)
DE (1) DE102009048961B4 (fr)
IN (1) IN2012DN03393A (fr)
RU (1) RU2539406C2 (fr)
WO (1) WO2011042194A2 (fr)

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Also Published As

Publication number Publication date
CN102656408B (zh) 2015-04-15
AU2010305044A1 (en) 2012-05-10
CA2776548A1 (fr) 2011-04-14
US8899884B2 (en) 2014-12-02
DE102009048961B4 (de) 2014-04-24
CN102656408A (zh) 2012-09-05
DE102009048961A1 (de) 2011-04-14
WO2011042194A2 (fr) 2011-04-14
RU2012117505A (ru) 2013-11-20
RU2539406C2 (ru) 2015-01-20
US20120266966A1 (en) 2012-10-25
WO2011042194A3 (fr) 2011-07-21
CL2012000911A1 (es) 2012-08-17
IN2012DN03393A (fr) 2015-10-23

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