EP3063252A1 - Coking plant for the coking of coal, and method for optimizing the coking conditions - Google Patents
Coking plant for the coking of coal, and method for optimizing the coking conditionsInfo
- Publication number
- EP3063252A1 EP3063252A1 EP14792392.4A EP14792392A EP3063252A1 EP 3063252 A1 EP3063252 A1 EP 3063252A1 EP 14792392 A EP14792392 A EP 14792392A EP 3063252 A1 EP3063252 A1 EP 3063252A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- furnace
- coking
- furnaces
- gas
- throttle valve
- 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- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B15/00—Other coke ovens
- C10B15/02—Other coke ovens with floor heating
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B21/00—Heating of coke ovens with combustible gases
- C10B21/10—Regulating and controlling the combustion
Definitions
- the invention relates to a coking plant for coking coal which operates according to a non-recovery or heat-recovery coking process.
- coke ovens For better heat utilization often 8 to 24 coke ovens are arranged side by side in the non-recovery and heat recovery coking process and connected to a so-called coke oven bank.
- the furnaces are connected on the exhaust side to a common collecting duct system, into which the exhaust gas volume flows of the furnaces are directed.
- the exhaust gas enthalpy can be used in at least one downstream heat exchanger to generate steam.
- the exhaust gases are desulphurised and released into the atmosphere.
- the sump system is characterized by a vacuum mode of operation as compared to the surrounding atmosphere.
- the required negative pressure of the entire system can be created by a blower and / or by the natural draft generated in a chimney. Blower and chimney are arranged downstream of the coke oven bank.
- the coking process is characterized by a temporal heterogeneous evolution of gas from the coal charge out.
- the gases rising from the coal charge are burned in the space above and below the charge by sucking in air through openings in the oven door, the furnace roof and side faces of a bottom channel located below the furnace shaft.
- the magnitude of the intake air flow is determined by the height of the applied vacuum in the oven.
- the process starts with the filling process of the feed coal mixture into the furnace chambers of the coke oven bank. There is by adding partial air the raw gas escaping from the coal cake under the influence of temperature initially only partially burned.
- the mixture of Restrohgas and exhaust gas from the partial combustion is passed through vertical channels in Sohlkanäle below the coal batches and there completely burned by secondary air addition.
- the exhaust gas is passed through connecting lines in a common gas manifold, in which the exhaust gas flowing from the connecting lines exhaust are sucked.
- the net coking time is the time required to completely remove the volatiles from the coal cake to form coke. As the furnace temperature increases, the amount of gas flowing into the combustion chambers from the coal cake intensifies, as a result of which an intensified combustion combined with a higher coking power is derived as a result of air supply.
- the net coking time of today's non- or heat-recovery coke ovens ranges from 24 hours to 96 hours, depending on design, coal and coal bed properties.
- the exhaust temperature in the leads varies in the order of 850 ° C to 1550 ° C, depending on the rate of coking and the amount of volatiles, which is usually less than 26% by weight (dry).
- the coking chambers and combustion chambers within non- or heat-recovery coke ovens are mostly made of silica material due to the high process temperatures, but their applicability is limited to approx. 1600 ° C. This limit of application can be exceeded if, during the coking, a feed mixture with a volatile content of more than 26% by weight (dry) is introduced into the oven chamber at random or as a result of a faulty mixing process of the individual components.
- dry dry
- the complete combustion of the resulting, larger amount of gas has a very in the first hours of coking in the oven intensive heat release with extremely high temperatures results, which can lead to the destruction of the silica material. It would therefore be useful if you could make the evolution of gas over the coking homogenous.
- each furnace is loaded and emptied according to an individual operating schedule. This means that each furnace of the coke oven bank is in a different coking state and the exhaust gas streams exiting the furnaces vary from oven to oven.
- the kilns belonging to a coke oven bank connect via their connecting line at different distances to the vacuum source to the gas manifold.
- different negative pressures occur in front of the furnaces.
- the height of the applied negative pressure determines the amount of air sucked into the furnace and thus the combustion and process speed of the coking process.
- the coking plant includes a coke oven bank having a plurality of juxtaposed furnace, a loading system for loading the furnaces with a coal cake, a discharge system for discharging the finished coke cake, and a gas manifold arranged parallel to the furnace bank.
- the ovens each have a furnace chamber closed furnace chamber with a head-side gas space as Primärterrorismraum, a Sohlkanal as Sekundärsortraum below the furnace chamber, at least one vertical channel between the Primärutzraum and Sekundärsortraum and openings for sucking primary air into the Primärloomraum and for sucking secondary air in the secondary boiler room.
- insulated connecting lines which connect the Sekundäreuerraum the ovens with the gas manifold and are equipped with a throttle device for changing the exhaust gas flow leaving the furnace.
- the exhaust gas quantity of a furnace is led via two connecting lines into the gas collecting line, which is arranged on the furnace cover of the Koksofenbank.
- the pressure conditions in the combustion chambers of the furnaces can be compensated by two vertical slide designs depending on the individual coking progress.
- the arrangement of the gas manifold on the furnace roof of the coke oven bank and the flow of the exhaust gas leaving the furnaces is technically very complex.
- the slide designs also have functional disadvantages.
- the slides are also composed of several stones and often do not withstand the high temperatures. They cause more expensive maintenance activities. At a high exhaust gas temperature of about 1550 ° C, they are prone to failure after a short period of use and must be replaced.
- the invention is based on the object in the connecting lines, which the secondary heating chamber of the furnaces with the gas Connect manifold to provide a throttle device that withstands high exhaust gas temperatures and allows such control of the exhaust stream that sets in all ovens of the coke oven bank a high and approximately the same net coking performance.
- a respective throttle valve rotatable about an axis is provided as throttle means, wherein the throttle valve is rotatably mounted in a housing, which on its inside a temperature-resistant lining has insulation and is used gastight between sections of the connecting line.
- the throttle valve preferably has a disk arranged on a shaft, wherein the shaft is rotatably supported on both sides in bearings accessible on the outer shell side of the housing and the bearings are protected against high temperatures by fabric packs.
- the bearings are functional plain bearings.
- the cloth book packings may comprise carbonaceous sealing cords.
- the throttle valve may be formed as a hollow body, so that it can be flowed through by a cooling fluid.
- a cooling fluid is, for example, air or a liquid coolant, such as water or an oil, into consideration.
- the disc of the throttle expediently consists of a heat-resistant ceramic fiber material or has a cover layer of a temperature-resistant insulating material.
- the lining of the housing can also be made of a heat-resistant ceramic fiber material, refractory concrete or a temperature-resistant insulating material using corundum, silica, Silicon carbide, dolomite, and chrome ore shares exist.
- the housing of the throttle device and the shaft are preferably made of alloyed, heat-resistant steel or stainless steel.
- the length of the throttle device according to the invention can vary in a value range from 350 mm to 1500 mm.
- the throttle valve can be moved between an opening angle of 0 ° (closed) and 90 ° (open) and is expediently designed with a resounding flap plate.
- the exhaust gas with an exhaust gas temperature of 1550 ° C flow past without damage or functionality problems. As a result, it is no longer necessary to reduce the temperature and thus to reduce the coking rate in the kilns of the coke oven bank.
- connection lines have, for example, an inner free flow cross-section of 0.2 m 2 to 2.1 m 2 .
- the internal diameter of the insulated connecting cables varies between DN 500 mm and DN 1600 mm depending on the system configuration.
- the outer diameter of the insulated connecting lines is in the order of 800 mm to 2100 mm.
- the housing of the throttle device is suitably adapted by flange connections in the connecting line, wherein the flange connection is preferably carried out in the pressure stage PN 6.
- the gas manifold of the coking plant according to the invention is arranged according to a preferred embodiment of the invention in a concrete tub in front of the stoves below the floor level, wherein the insulated connecting lines, each connecting the flow-side end of the bottom channel of a furnace with the gas manifold, a vertical portion, a horizontal portion and have a bow connecting these two sections and are supported by a support structure on the concrete tub.
- the gas manifold may be composed of several segments of different diameter.
- the concrete tub has, for example, a U-shaped or L-shaped cross-section and is useful on the top to avoid the incidence of foreign bodies with a grid, snapped or slot-shaped cover provided.
- the concrete tank serves to protect the gas manifold against groundwater.
- the connecting cables can have at least one measuring point for permanent temperature measurement, for permanent pressure measurement and / or for permanent oxygen measurement. Furthermore, an additional measuring point connection for a mobile measuring device can be provided for the manual measurement of any physical quantity.
- the invention also provides a method according to claim 12 for optimizing the coking conditions in side-by-side furnaces of a coke oven bank.
- the back to the claim 12 related claims 13 to 17 relate to advantageous embodiments of the method.
- the method will be explained below together with an embodiment of the coking plant according to the invention with reference to drawings. They show schematically:
- Fig. 1 a detail of a plan view of a coking plant for
- FIG. 3 shows a detail of Fig. 2 in a comparison with FIG. 2 enlarged
- the coking plant shown in Fig. 1 comprises in its basic structure a coke oven bank 1 with a plurality of juxtaposed furnaces 2, a loading system 3 for feeding the furnaces with a coal cake 4, a discharge system 5 for discharging the finished coke cake and a parallel to the coke oven bank 1 arranged Gas manifold 6.
- the furnaces. 2 each one of furnace chamber doors 7 closed furnace chamber 8 with a head-side gas space as Primärterrorismraum 9, a Sohlkanal as Sekundärutzraum 10 below the furnace chamber 8, at least one vertical channel 1 between the Primärteilraum 9 and the Sekundmaschineraum 10 and openings 14 for sucking primary air into the Primärsortraum.
- insulated connection lines 12 are provided, which connect the Sekundäreuerraum 10 of the ovens 2 with the gas manifold 6 and are equipped with a throttle device 13 for changing the furnace 2 leaving exhaust stream.
- the juxtaposed furnaces 2 of the coke oven bank 1 are charged according to an individual operating instructions with coal and used for cyclic coking coal. Crude gas, which escapes from the feed coal under the influence of temperature, is partially combusted in the primary heating chamber 9 of the furnaces 2 above the coal charge with air. A mixture of raw gas and exhaust gas is passed into the secondary space 10 below the coal charge and there completely burned by secondary air addition. The resulting in the complete combustion exhaust gas 15 is passed individually to each furnace 2 through an insulated connection line 12 into the gas manifold 6, in which the exhaust gas flowing from the connecting lines of the furnaces 2 exhaust gas is sucked. At each furnace 2, the exhaust gas flow 15 can be regulated by the throttle device provided there.
- FIGS. 2 and 3 shows that within the flow cross-section of the insulated connecting line, which connects the gas manifold 6 to the Sekundäreuerraum 10 of the furnace 2, a 16 rotatable about an axis throttle valve 17 is provided as a throttle device.
- the throttle valve 17 is rotatably mounted in a housing 18 which has on its inside a temperature-resistant lining 19 as insulation and between sections 20, 20 'of the connecting line is inserted gas-tight.
- the exhaust stream 15 of the furnace 2 may be adjusted to the individual coking rate within the furnace.
- the throttle valve 17 has a disk 22 arranged on a shaft 21.
- the shaft 21 is rotatably supported on both sides in bearings accessible on the outside of the casing, which are protected from high temperatures by fabric packs, for example with carbon-containing sealing cords.
- the throttle valve 17 is preferably coolable.
- the shaft 21 and / or the disc 22 may be formed as a hollow body, which is flowed through by a cooling fluid.
- the disc 22 of the throttle valve 17 may be made of a heat-resistant ceramic fiber material or have a cover layer of a temperature-resistant insulating material.
- the housing 18 and the shaft 21 are preferably made of alloyed heat-resistant steel or stainless steel.
- the housing 18 of the throttle device is fitted by flange 23 in the connecting line 12, wherein the flange 23 are expediently carried out in the pressure stage PN 6.
- the lining 19 of the housing 18 is made of a heat-resistant ceramic fiber material, refractory concrete or a temperature-resistant insulating material using corundum, silica, silicon carbide, dolomite and / or chrome ore.
- the gas manifold 6 is arranged as shown in FIG. 2 in a concrete tub 24 in front of the ovens 2 below the ground level 25.
- the insulated connection lines 12, which each connect the Sekundäreuerraum 10 of a furnace 2 with the gas manifold 6, have a vertical portion, a horizontal portion and an arc connecting these two sections and are supported by a support structure 26 on the concrete tub 24.
- the wiring is designed so that the exhaust gas 15 the furnace 2 initially in a vertical sub-segment below the bottom channel leaves down and the connection to the gas manifold 6 after flowing through a 90 ° arc in a downstream horizontal sub-segment occurs.
- the connecting line 12 constructively has at least one 90 ° arc, which in a particularly preferred variant can consist of two 45 ° arcs.
- the throttle valve 17 can - as shown in the embodiment - in the vertical sub-segment, alternatively in the horizontal sub-segment, are arranged.
- the insulated connection lines 12 may, for example, have an internal diameter between DN 500 mm and DN 1600 mm and an external diameter between 800 mm and 2100 mm. In the connecting lines 12 there is a negative pressure to the atmosphere of -50 Pa to -350 Pa.
- the connecting lines 12 have a measuring point 27 for permanent temperature measurement and a measuring point 28 for permanent pressure measurement, wherein the pressure measuring point 28 is arranged upstream of the throttle flap 17 and the temperature measuring point 27 is provided behind the throttle flap 17 in the flow direction is.
- a measuring point connection 29 for a mobile measuring device for the manual measurement of any physical variable, for example for measuring the oxygen content, may be provided in the connecting lines 12.
- the throttle valve 17 can be moved between an opening angle of 0 ° (closed) and 90 ° (open). After filling a furnace, the throttle valve 17 of the connecting line 12 assigned to this furnace is opened. The flow cross-section released by the throttle valve 17 is then reduced with increasing coking progress and decreasing amount of exhaust gas. After approximately half of the nominal net coking time has elapsed, the free flap flow area is further reduced to give an approximately 35 to 55% open position. Some time before the coke is squeezed, the open flap cross-section is further throttled or completely closed, as now the gas release in the furnace conclusion has come. This ensures that the coke charge is evenly heated by heat conduction and the further ingress of air through the open primary and secondary air openings is avoided.
- the actuation of the throttle valve 17 is preferably carried out by means of a controlled drive 30 as a function of physical parameters, so that the individual coking progress is met.
- Pressure, temperature, carbon monoxide, methane, hydrogen or oxygen measurement signals or combinations of these signals can be used as reference variables for the valve position to be set.
- a lambda probe can also be used in the connection line 12.
- the measured values recorded at the measuring points 27, 28 are digitally recorded, stored and compared in a computing unit with a desired value, wherein the connection to the arithmetic unit takes place via suitable signal or radio lines.
- the damper position of the throttle valve is changed via the drive 30 so that the desired pressure and temperature setpoint value is established.
- the exhaust gas temperature is always controlled so that temperatures of maximum 1550 ° C occur in the furnace cavity and in the furnace vault. In the bottom channel of the furnaces, a negative pressure of -50 Pa to -300 Pa is expediently set.
- the control is expediently such that the oxygen content of the exhaust gas in the connecting line at the kiln outlet is about 4 to 10% by volume.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Coke Industry (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201310112036 DE102013112036A1 (en) | 2013-10-31 | 2013-10-31 | Coking plant for coal coking and process for optimizing coking conditions |
PCT/EP2014/002879 WO2015062713A1 (en) | 2013-10-31 | 2014-10-24 | Coking plant for the coking of coal, and method for optimizing the coking conditions |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3063252A1 true EP3063252A1 (en) | 2016-09-07 |
Family
ID=51844665
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14792392.4A Withdrawn EP3063252A1 (en) | 2013-10-31 | 2014-10-24 | Coking plant for the coking of coal, and method for optimizing the coking conditions |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3063252A1 (en) |
DE (1) | DE102013112036A1 (en) |
WO (1) | WO2015062713A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112746169B (en) * | 2021-02-04 | 2022-08-19 | 大冶有色金属有限责任公司 | Method for quickly melting coke by spray gun of Ausmelt smelting furnace |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5114542A (en) | 1990-09-25 | 1992-05-19 | Jewell Coal And Coke Company | Nonrecovery coke oven battery and method of operation |
DE10201985A1 (en) * | 2002-01-21 | 2003-07-31 | Koch Transporttechnik Gmbh | Coking arrangement comprises coking ovens arranged in rows each having oven chamber for receiving coal, and channel running along row for deviating hot combustion gases and delimited on wall of chambers of ovens |
-
2013
- 2013-10-31 DE DE201310112036 patent/DE102013112036A1/en not_active Withdrawn
-
2014
- 2014-10-24 EP EP14792392.4A patent/EP3063252A1/en not_active Withdrawn
- 2014-10-24 WO PCT/EP2014/002879 patent/WO2015062713A1/en active Application Filing
Non-Patent Citations (2)
Title |
---|
None * |
See also references of WO2015062713A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102013112036A1 (en) | 2015-04-30 |
WO2015062713A1 (en) | 2015-05-07 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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17P | Request for examination filed |
Effective date: 20160428 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
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AX | Request for extension of the european patent |
Extension state: BA ME |
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DAX | Request for extension of the european patent (deleted) | ||
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: THYSSENKRUPP INDUSTRIAL SOLUTIONS AG Owner name: THYSSENKRUPP AG |
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17Q | First examination report despatched |
Effective date: 20170921 |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: THYSSENKRUPP AG Owner name: THYSSENKRUPP INDUSTRIAL SOLUTIONS AG |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20190501 |