3/29/2023 DE3902996A1 - Method for cooling high-temperature coke - Google Patents

Patents

Method for cooling high-temperature coke

Abstract
DE3902996A1
A novel method for cooling high-temperature coke is proposed, in which the coke is cooled in direct
Germany
heat exchange with a fluid, preferably water, as a heat-dissipating cooling medium under elevated
pressure and the cooling medium constantly remains in the liquid state during the cooling process in
the cooling chamber. <IMAGE> Find Prior Art Similar

Classifications Other languages: German

Inventor: Dieter Dipl Ing Dr Hollenhorst, Horst Rest, Uwe Dipl Ing
C10B39/04 Wet quenching Tschirner

Current Assignee : Still Otto GmbH

Worldwide applications

1989 DE

Application DE19893902996 events

Priority claimed from DE3834578

Application filed by Still Otto GmbH

Priority to DE19893902996

Publication of DE3902996A1

Application granted

Publication of DE3902996C2

Anticipated expiration

Status Expired - Fee Related

Info: Patent citations (4), Legal events, Similar documents,

External links: Espacenet, Global Dossier, DPMA, Discuss

Claims (12) Hide Dependent

1. A method for cooling high-temperature coke, characterized in that the coke is cooled in direct heat exchange with a fluid, preferably water, as a heat-dissipating coolant under
increased pressure, the coolant always remaining in the liquid state during the cooling process in the cooling chamber . 2. The method according to claim 1, characterized records
that the coolant in a primary circuit and the heat in a heat exchanger me to a secondary circuit, preferably for generation of high-tension steam. 3. The method according to claim 1 or
2, characterized ge indicates that to compensate the esp especially with the entry and exit of the coke from the cooling chamber pressure fluctuations the pressure in one the
pressure chamber connected to the cooling chamber essentially is kept constant. 4. The method according to claim 3, characterized records that in the pressure holder a water
column of a certain height above the cooling circuit water mirror with a water vapor cushion arranged above it is held and an increase in pressure by heating the Water bath and a
pressure reduction by spraying colder water into the water vapor cushion. 5. The method according to at least one of claims 1 to 4, characterized in that the Coke preferably
discontinuously with the help of locks chambers or lock valves in the pressurized Cooling chamber entered or discharged from the cooling chamber is and the pressure
maintenance in the lock chambers over a Inert gas cushioning takes place in a separate pressure plate is built and dismantled. 6. The method according to claim 5, characterized
records that to transport the coke through the Cooling chamber with the upstream and downstream locks came In these three chambers the pressure from the inlet lock chamber to
the cooling chamber and from there to the outlet lock chamber is gradually reduced. 7. The method according to at least one of claims 1 to 6, characterized in that the Coke before
direct water cooling in an antechamber and / or the entrance lock chamber, preferably indirectly cooled to below 800 ° C, if possible not below 700 ° C becomes. 8. The method
according to claims 2 and 7, characterized characterized in that the coolant of the Se customer cycle also for indirect cooling in the front chamber and / or entrance lockchamber
is used. 9. The method according to claim 8, characterized records that in the secondary circuit in the heat exchanger generated steam or the preheated water further evaporation
or overheating in the cooling surfaces the antechamber or lock chamber is directed. 10. The method according to at least one of claims 1 to 9, characterized in that in the primary
circuit a chemical water treatment and a solid separation is integrated. 11. The method according to at least one of claims 1 to 10, characterized in that in the cooling chamber of the
coke and the coolant preferably in Direct current are carried. 12. The method according to claim 5, characterized records that the pressure maintenance in the cooling chamber
downstream lock chamber over a water template is such that a certain, with the Lock chamber volume corresponding amount of water in chronological order withthe corresponding
coke carrying operations between the lock chamber and an ex tern arranged water reservoir for example with a suitable pump is pumped back and forth.

Description translated from German

For cooling high-temperature coke from coking ovens under one basically differentiates between wet extinguishing by loading trickle with fire water under the open fire
tower and the direct and / or indirect coke dry cooling.

Wet extinguishing creates the problem of significant emissions sions. In addition, the coke is applied when cold fire water is subjected to considerable mechanical stress.

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With coke dry cooling, the coke is closed NEN system cooled so that no significant emissions may occur. Next to it there is no shock-like, but the coke cools more slowly
and gently. Apart from the abrasion during transport, the coke is used in the Coke dry cooling hardly stressed mechanically. However, must a retention time of the coke inthe
cooling chamber of min Be at least 1.5 to 2 hours to go to a Korntie to achieve effective coke cooling.

The object of the invention is a new method for cooling propose high-temperature coke, in which the aforementioned Problems of the known wet extinguishing or drycoke
cooling can be largely avoided.

To solve this task, those in the license plate of the To Proposition 1 proposed measures. The Unteran Proverbs 2 to 12 contain additional suggestions. To Er increase inthe
power density during heat transfer cooling hot coke fill is a preferred direct and pressure leading, i.e. pressurized water cooling proposed, the system pressure is chosen
so that the Cooling water does not evaporate, i.e. the coolant during the Cooling process of the cooling chamber always in the liquid state remains.

The advantages of the cooling system according to the invention are:

1. The dwell times of the coke in the pressure cooling system are not higher than that of conventional wet extinguishing. There is the size or volume of the
cooling chamber and of the pressure vessel is relatively small compared to the cooling shaft a coke dry cooler that is mainly exposed to gas lung.
2. Inevitably, no cooling-related dust problems can occur ben. Particles of solid that may be discharged from the cooling water kel can in a waterproof separator
(filter) slurried or discharged.
3. The water-carrying pressure circuit does not become a higher temp temperature than approx. 300 ° C.
4. The mechanical stress on the coke during pressure was cooling is similar to that of coke dry cooling lung.
5. The discharged, cooled coke has a certain end moist, so that in contrast to dry-cooled coke there are no dust problems during onward transport.

That in the so-called primary circuit under increased pressure guided coolant transfers the heat in a heat exchanger to a secondary circuit, preferably for generating high-
tension steam. Then in this secondary circuit with the help of a steam turbine and an electric generator Electricity are generated.

To compensate for the pressure swan arising in the cooling chamber The pressure is then connected to the cooling chamber basically kept its pressure holder constant. In
it will essentially a water column of a certain height above the Water level of the cooling circuit with one arranged above it Neten water vapor cushion kept, increasing
pressure by heating the water bath and reducing the pressure by spraying colder water into the water vapor cushion he follows.

The coke can, preferably discontinuously, with the aid of Lock chambers or lock valves in the under pressure standing cooling chamber entered or out of the cooling
chamber be worn, keeping pressure in the lock chambers via an inert gas cushion, which is in a separate Pressure accumulator is built up and dismantled. To transport the
coke from the upstream lock chamber into the cooling chamber and from there into the downstream lock chamber is in this three chambers of pressure in the
transport direction gradually ge slightly reduced.

It is also possible that the pressure maintenance in the cooling chamber always downstream lock chamber via a water reservoir in such a way that a certain, with the
Schleusenkammervo lumen corresponding amount of water in chronological order with the corresponding coke discharge processes between the Lock chamber and an
externally arranged water reservoir pumped back and forth with a suitable pump, for example becomes.

According to the invention, it has proven to be advantageous to use the coke direct water cooling in the pressure cooling chamber in one Prechamber and / or preferably at
the entrance lock chamber indirectly to below 900 ° C, preferably not below 700 ° C, cool down. This temperature essentially depends on the Size of the prechamber and
the available ver from time. The coolant of the secondary circuit is used also useful for indirect cooling or overheating in the Antechamber and / or the entrance lock
chamber.

In the primary circuit under increased pressure also chemical water treatment and a possibility to be integrated for solids separation in order to prevent corrosion and to
avoid loading the circuit with solids.

After all, it has proven useful to use coke and Lead coolant in the cooling chamber in direct current to one Avoid floating the pieces of coke.The

invention is illustrated by the attached figure, for example described in more detail.

1. Hot coke entry and hot coke pre-cooling

In the feed bunker ( 1 ), which is fireproof-lined on the material side, a coke oven chamber filling of hot coke ( E ) with a mass of, for example, 20 to 30 t each is filled in
batches at intervals of about 10 to 15 minutes and reaches the bottom via via known discharge and entry elements Antechamber at atmospheric pressure ( 2 ).

In this antechamber are water evaporation in a known manner integrated cooling surfaces along which the hot coke glides and already part of its heat through heat
radiation in the present high temperature range.

The residence time in the antechamber is expediently included to determine or limit such that the hot coke tempera Do not already drop below approx. 700 ° C here in order
to build size of this dryer before the pressure wet cooling not to let cooling rise excessively.

In the evaporator surfaces, depending on the need or depending on Ge, both saturated steam and preheated water can occur below the boiling point, so that the cooling
medium leaves this stage in the form of superheated steam ( L 8 ) and the pre-chamber ( 2 ) acts as a superheater stage.

The entry / discharge slide device ( S 1 ) ensures the further transport of the pre-cooled coke into the subsequent lock chamber ( 3 ).

2. Pressure build-up on the inert gas side

After the occurrence of the (pre-cooled) Heißkokses in which the pressure chamber (6) upstream of the lock chamber (3) is a connection between the lock chamber and
an externally arranged Inertgasdruckspeicher (4), Herge via the line (L 2).

By controlled opening and closing of the valves installed in this line ( L 2 ), a corresponding pressure build-up in the lock chamber ( 3 ) can be practiced in such a way thatthe
necessary pressure reservoir in the pressure accumulator ( 4 ) via the inert gas supply line ( L 1 ) or the pressure accumulator bypass line ( L 12 ) is ensured. It is thus
possible to build up such a high pressure in the lock chamber ( 3 ) within a technically predetermined time that it is above the system pressure in the subsequent cooling
chamber ( 6 ).

This measure / process design ensures that the pressure in the lock chamber ( 3 ) can never drop below the pressure in the pressure chamber ( 6 ), so that when the
connecting lines (valves) between the lock and pressure chamber are opened, the system pressure is always above of the theoretical vapor pressure.

This keeps the cooling water even after the process engineering connection between the lock chamber and the cooling circuit always in the liquid state.

3. Water / steam side pressure maintenance

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To control an increase / decrease in pressure in the cooling circuit ( 7 ) or to regulate the constant system pressure, a pressure-holding vessel ( 5 ) connected to the
cooling circuit ( 7 ) via pipes ( L 3 ), ( L 4 ), ( L 6 ) is for example Half filled with water to boiling temperature. Above the water level there is a vapor cushion, the vapor
phase being in direct thermodynamic equilibrium with the liquid phase. The pressure is controlled on the one hand by electric heating rods ( L 5 ), which are located in the
pressure holder below its water level, and on the other hand, via a water spray device ( L 4 ), the outlet nozzles of which are arranged in the steam chamber of the
pressure holder ( 5 ), i.e. above its liquid level are.

Through these spray nozzles, when the pressure rises above the setpoint to be controlled, colder water is sprayed into the Druckhal ter steam chamber, steam
condensing and the system pressure being reduced. This relatively cold water is taken from the cooling circuit behind the coolant pump ( 8 ) connected downstream of the
heat exchanger ( 11 ), that is to say before it enters the pressure chamber ( 6 ). If the pressure drops below the minimum threshold to an unacceptably high level, the
heating elements ( L 5 ) in the water bath of the pressure holder are supplied with electrical energy in stages / groups, which raises the system pressure to the setpoint.

To maintain and control a constant cooling circuit system pressure in the pressure vessel is always above the one corresponding to the cooling water outlet temperature
Vapor pressure.

For this purpose, the pressure holder relative to the pressure vessel ( 6 ) must be arranged geodetically higher, so that the boiling pressure prevailing here is smaller bythe
amount of the holding height than the system pressure in the cooling circuit.

The difference in height of the water level between the pressure holder ( 5 ) and the cooling circuit ( 7 ) is therefore a measure of the safety distance from the boiling point
in the circuit.

4. Cooling process in the pressurized water circuit

The coke feed entering the actual cooling chamber ( 6 ) from the lock chamber ( 3 ) via the slide device ( S 2 ) flows through the pressurized cooling water, the inlet
temperature of which is above approximately 110 ° C. and, depending on the pressure level, below approximately 240 ° C. The warm-up period, ie the heating of the
cooling water in the cooling circuit, is expediently kept below 50 ° C, preferably at 30 to 50 ° C, in order to obtain inadmissibly high thermal stresses at the relatively high
pressure level in the cooling circuit. The expected cooling water outlet temperature is therefore above approx. 140 ° C and below 290 ° C, depending on the thermal
requirements in the secondary / parallel secondary circuit ( 12 ).

The amount of water to be circulated via the coolant pumps ( 8 ) and ( 9 ) then results from the amount of heat to be dissipated from the coke and the previously
determined warm-up span of the heat-dissipating circuit pressurized water.

The water volume displaced when filling / entering the coke bed from the sluice chamber ( 3 ) into the cooling chamber ( 6 ) from this cooling chamber into the sluice
chamber flows via the line ( L 7 ) through natural gradient (gravity) via the cleaning container of the chemi acting as a collecting container water purification ( 10 ) back into
the cooling circuit.

The cooling water flows through the cooling chamber ( 6 ) in cocurrent with the coke bed from top to bottom, so that a swim on the coke pieces is avoided.

The water loss in the cooling water circuit ( 7 ), inter alia due to moistening of the coke, is compensated for by adding water via the water filling line ( L 13 ). In the lower
part of the chemical water treatment tank ( 10 ) there is also a dust and waste water discharge ( a ).

5. Heat dissipation in the secondary circuit

The amount of heat extracted from the coke by the cooling circuit ( 7 ) in the cooling chamber ( 6 ) is transferred to a secondary circuit ( 12 ) in a heat exchanger ( 11 ).

Through this heat exchanger, the condensate is conveyed via the pump ( 13 ), which is obtained from a condenser connected downstream of the superheated steam
turbine ( 18 ), the energy being dissipated via a generator ( 19 ) connected to the superheated steam turbine.

Depending on the size of the heat transfer surfaces installed in the heat exchanger ( 11 ), the temperature level available on the primary side and the amount of coolant to be
circulated on the secondary side, the thermodynamic state of the coolant (saturated steam or warm / hot water) is determined, which then dissipates it for indirect heat /
Pre-cooling of the hot coke enters the superheater stage of the pre-chamber ( 2 ).

To compensate for any steam released via lines ( L 9 ) / ( L 10 ), condensate can be filled in via line ( L 14 ).

6. Coke discharge after the cooling process

After the hot coke has been cooled in the cooling chamber ( 6 ) to final temperatures of 150 to 300 ° C, the product passes through the slide device ( S 3 ) into a
downstream lock chamber ( 14 ), in which a previously opposite one is located via the inert gas line ( L 11 ) the cooling chamber was set to a slightly lower pressure, so
that no inert gas can flow back into the cooling chamber and the coke is discharged into the geodetically higher lock chamber ( 14 ), although the slide device ( S 4 ) at the
foot of the lock chamber ( 14 ) must be closed.

After the cold coke has been introduced into this discharge sluice chamber ( 14 ), pressure can be relieved by opening the safety valve (SV) when the slide device ( S 3 ) is
closed, so that the cold coke ( A ) is released under atmospheric pressure with the slide device ( S 4 ) open the lock chamber ( 14 ) falls into the discharge chamber ( 15 )
and can then be withdrawn via the discharge device ( 20 ).

When the cold coke is discharged from the cooling chamber ( 6 ) into the lock chamber ( 14 ), any cooling water that escapes evaporates when the pressure is released
between the discharge chamber ( 15 ) and the lock chamber ( 14 ) when the safety valve (SV) is open.

This steam is sucked in together with the inert gas escaping from the lock chamber ( 14 ) into the discharge chamber ( 15 ) by the fan ( 16 ), the water vapor in the intake
port of the fan as a condensate of a pump ( 17 ) which can inevitably discharge the amount of cooling water pumps back into the cooling circuit.

Reference symbol list:

( 1 ) feed hopper
( 2 ) antechamber
( 3 ) lock chamber
( 4 ) Inert gas pressure accumulator
( 5 ) pressure holder
( 6 ) cooling chamber
( 7 ) Cooling water circuit or primary circuit (
8 ) Main coolant pump
( 9 ) Main coolant pump

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( 10 ) water treatment
( 11 ) heat exchanger
( 12 ) secondary circuit
( 13 ) Condensate pump or secondary circuit pump
( 14 ) lock chamber
( 15 ) Discharge room
( 16 ) blower
( 17 ) pump
( 18 ) Steam turbine with an integrated condenser(
19 ) generator
( 20 ) host
( L 1 ) Inert gas feed line
( L 2 ) Inert gas supply line
( L 3 ) connecting line between pressure holder ( 5 ) and pressure chamber ( 6 )(
L 4 ) spray line
( L 5 ) heating cable
( L 6 ) overpressure line or steam blow-off line(
L 7 ) water overflow pipe
( L 8 ) high pressure steam supply line(
L 9 ) Saturated steam blow-off line
( L 10 ) high pressure steam blow-off line(
L 11 ) inert gas line
( L 12 ) Accumulator bypass line
( L 13 ) water filling pipe
( L 14 ) Condensate fill line
( S 1 ) to
( S 4 ) slide device
(SV) safety valve
(E) Entry of the hot coke
(A) Outlet of the cold coke
(a) Dust and wastewater discharge

Patent Citations (4)

Publication number Priority date Publication date Assignee Title

FR770681A * 1933-06-14 1934-09-18 Fr De Travaux Et Construction Improvements to installations for the purpose of quenching coke at the
outlet of furnaces or the like

DE800971C * 1948-12-29 1950-12-18 Koppers Gmbh Heinrich Device for extinguishing coke

DE873686C * 1940-02-12 1953-04-16 Koppers Gmbh Heinrich Device for extinguishing coke

DE2320057B1 * 1973-04-19 1974-08-08 Eschweiler Bergwerks-Verein, 5122 Method and device for extinguishing a heated bulk material
Kohlscheid

Family To Family Citations

* Cited by examiner, † Cited by third party

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Priority And Related Applications

Priority Applications (1)

Application Priority date Filing date Title

DE19893902996 1988-10-11 1989-02-02

Applications Claiming Priority (2)

Application Filing date Title

DE3834578 1988-10-11

DE19893902996 1989-02-02

Legal Events

Date Code Title Description

1990-04-12 OP8 Request for examination as to paragraph 44 patent law

1990-10-04 D2 Grant after examination

1991-04-04 8364 No opposition during term of opposition

1994-02-17 8339 Ceased/non-payment of the annual fee

Concepts

machine-extracted Download Filter table

Name Image Sections Count Query match

cooling title,claims,abstract,description 79 0.000

coke title,claims,abstract,description 59 0.000

https://patents.google.com/patent/DE3902996A1/en 5/6
3/29/2023 DE3902996A1 - Method for cooling high-temperature coke - Google Patents

water claims,abstract,description 53 0.000

coolant claims,abstract,description 18 0.000

method claims,abstract,description 7 0.000

liquid claims,abstract,description 5 0.000

fluid claims,abstract 2 0.000

inert gas claims,description 11 0.000

corresponding claims,description 6 0.000

heat treatment claims,description 5 0.000

solid claims,description 4 0.000

upstream manufacturing claims,description 3 0.000

evaporation claims,description 2 0.000

separation method claims,description 2 0.000

spraying claims,description 2 0.000

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