DE4230028C1 - Low pollution coking system - has chamber walls heated directly by coking chamber gas combustion - Google Patents

Abstract

In a coking system with horizontal coking chambers indirectly heated by adjacent side heating walls, devices for drawing chamber gases from the coking chambers and devices for supplying gas and combustion air to the heating walls and for withdrawing waste gases, the novelty is that (i) vertical closable connection channels (1) are provided in the oven roof in the region of the chamber ends and are in communication with transverse channels arranged in the oven battery length direction in the oven roof directly above the coking chamber; (ii) the transverse channels are connected to the heating walls via vertical closable connection channels (4); (iii) the heating walls consist of vertical heating flues (8) which are connected, at their upper ends to a horizontal channel oriented in the oven length direction for regular gas distribution to the individual flues, and (iv) vertical header channels with raised outlet slits, located between the flues for supplying combustion air to the flues. ADVANTAGE - The chamber gas can be supplied directly, without intermediate gas cleaning, to the heating system for combustion and is not combusted in the coking chambers. The system can be used in modern coking chambers of more than 6m. height while minimising emission of pollutants (CO, NOx).

Description

The invention relates to a coking system with hori zonally arranged coking chambers and next to it orderly heating walls for indirect heating of the coking chambers with facilities for discharging the raw gases from the Coking chamber and with devices for supplying gas and combustion air to the heating walls and exhaust pipes as well as a process for coking in this coking system.

Because of the ever decreasing revenues of the raw gas products and due to the high environmental requirements, considerations asked how the costs for the Reini tion of the raw gases produced during the coking process is reduced can be. In this context, the so-called "Non-recovery ovens" or the waste heat ovens again for discussion posed.

From the "Handbuch der Kokereiwesen", publisher: Grosskinsky, Volume 1, 1955, pp. 160/161 are different systems from Ab Heat coke ovens can be seen, the heating in each case continuously with fresh gas in all heating trains from bottom to top. The hot exhaust gases are heated by a below the Oven sole arranged through the fox the waste heat channel forwarded. The steam boilers are attached to this waste heat duct closed in which the sensible heat of the exhaust gases to the steamer  generation is exploited (see p. 160, 2nd paragraph). In the dar provided systems, however, a cleaned strong gas Heating trains each heating wall via horizontal high-pressure gas ducts leads.

From "Stahl und Eisen", 1906, pp. 1499 to 1505 are generic moderate coking equipment can be seen, in each heating wall two upper longitudinal channels are arranged one above the other. The higher-lying longitudinal channels are provided through floor openings the ones below them. Besides, everyone is Longitudinal channels of the top layer over the chamber ceilings connected with each other. This is a compli adorns the canal system arranged above the coke ovens. Here in particular the raw gases from the coking chambers the hole openings in the upper, in the longitudinal direction of the furnace ordered longitudinal channels and get from there via a Row of openings in the longitudinal channels below for distribution to the individual vertical heating trains. The Combustion air is stored in the battery from below the heating wall longitudinally arranged feed channels over vertical Binder channels in the furnace wall up to an inlet opening on headed the upper end of the heating cables. This from the century Reversible heating system has not prevailed and is particularly with regard to the aggravated environment protection conditions no longer applicable in today's world. The applies especially with regard to NOx formation in single-stage Combustion.

The invention is therefore based on the object, a new Ver to propose a coking system and a coking process, with the usual chamber heights of more than 6 m below Compliance with environmental regulations can be achieved.

To solve this problem, the combination of the in the Kennzei Chen of claim 1 features a) to e) and the Measures of claim 6 featured  beat. In the subclaims are further embodiments men and measures specified.

In contrast, with the coking system according to the invention the raw material for all coke oven batteries common today gas in whole or in part directly without intermediate Gas cleaning fed to the heating system for combustion. It has compared to the earlier "non-recovery systems" and the Waste heat furnaces also have the advantage that no direct ver burning of the raw gas takes place in the coking chamber. Through the Querka arranged in the furnace ceiling on MS and KS channels are discontinuous in the individual coking accumulated raw gases collected and evenly on the individual heating walls distributed. These cross channels are possible deep in the hot area of the furnace ceiling, directly above the coking chambers to condense the raw gas prevent and adequate insulation of the furnace ceiling enable. For uniform heating of the coking chambers with today's usual chamber heights, this becomes known System with vertical combustion provided. This will uniform heating while minimizing the Pollutants (CO, NOx) reached in the waste heat.

It is considered particularly favorable to the channels for the Air supply and waste heat discharge below the heating walls not on top of each other, but next to each other. Under Applying the countercurrent principle therefore acts on the substructure of the Coking system like a recuperative plate heat exchanger, the combustion air before entering the heating cables in the is sufficiently heated by the waste heat.

The draft conditions in the coking system are appropriate by a hot gas duct arranged at the end of the flue gas duct blower or a suitable fan controlled. With not full utilization of the waste heat can lead to heat cooling, air is sucked in beforehand. Through a  speed controlled fan, the draft in the The furnace system can be adjusted continuously if required. Here is one regardless of the weather. An operation with chimneys must on the other hand, can be designed for extreme weather conditions.

The invention will be explained with reference to the accompanying FIGS . 1 to 3 in example.

Fig. 1 shows in perspective the arrangement of the coking system.

Fig. 2 is a vertical longitudinal section, partly through a heating wall and partly through an oven chamber.

Fig. 3 is a vertical section through a coking system in the longitudinal direction of the battery.

The hot raw gas which is produced discontinuously in the coking chambers ( 15 ) is passed vertically through the connecting duct ( 1 ) into the transverse duct ( 2 ) arranged in the furnace ceiling. When squeezing the coke out of a coking chamber, the gate valve is used to close the connection between the respective coking chamber and the cross channel in order to prevent additional air from entering the heating system when the coke is pressed due to the vacuum operation and thus to prevent uncontrolled combustion in the ceiling area .

In the transverse channel ( 2 ), the discontinuous raw gas accumulation from the various coking chambers is compensated for, so that the required uniform amount of raw gas is passed through the connecting channels ( 4 ) into the horizontal channel ( 6 ).

In the horizontal duct ( 6 ) extending in the longitudinal direction of the furnace there are slides above each heating flue ( 8 ) for regulating the gas quantity distribution over the length of the entire heating wall. When the heating is set with the aid of this slide device ( 7 ), the shut-off slide valves ( 5 ) arranged in the connecting duct ( 4 ) are closed. The combustion air required for combustion in the heating trains is fed via the sole channels ( 9 ), the vertical binder channels ( 10 ) and the height-graded air outlets ( 11 ) to the heating trains. After the combustion, the waste heat enters through the outlets ( 12 ) on the heating soleplate into the waste heat sole channels ( 13 ) and is passed via the inlet ( 14 ) into a flue gas collecting channel running in the longitudinal direction of the battery. The sole channels ( 9 ) for the air supply and ( 13 ) for the heat dissipation are arranged below half of the heating wall ( 16 ) in parallel next to each other. In the coking system, any number of coking chambers ( 15 ) and corresponding heating walls ( 16 ) to a battery block with outer battery heads ( 18 ) can be summarized.

In the figures, the filling shafts and ( 20 ) the anchor stands on the furnace heads are additionally shown with ( 19 ).

Reference list

1 connection chamber / cross channel (KS and MS)
2 cross channel over all furnaces on KS and MS
3 gate valves to close when pressing the oven
4 Cross channel / horizontal channel connection
5 gate valves to close when adjusting or to view the heating cable
6 horizontal channel
7 slide device in the horizontal channel ( 6 )
8 heating cable
9 sole channel, air supply
10 binder channel
11 air vents, tiered
12 Heat discharge on the heated soleplate
13 heat sink channel
14 Entry of flue gas duct
15 coking chambers
16 heating wall
17 Top edge of the furnace ceiling
18 battery head
19 filling shafts
20 anchor stands

Claims (7)

1. Coking system with horizontally arranged Verkokungskam mern and laterally arranged heating walls for indi direct heating of the coking chambers with devices for discharging the raw gases from the coking chamber and with devices for supplying gas and combustion air to the heating walls and exhaust gas, characterized in that

• a) in the region of the longitudinal ends (KS and / or MS) of the Verko kungskammer ( 15 ) in the furnace ceiling, vertical, lockable connecting channels ( 1 ) are arranged, the
• b) with transverse channels ( 2 ) which are arranged directly above the coking chamber ( 15 ) in the furnace ceiling in the longitudinal direction of the battery and that
• c) the transverse channels ( 2 ) via vertical, lockable connec tion channels ( 4 ) with the heating walls ( 16 ) are connected, wherein
• d) the heating walls ( 16 ) consist of a plurality of vertical heating trains ( 8 ) which are connected at their upper end with a horizontal channel ( 6 ) arranged in the longitudinal direction of the furnace for the orderly distribution of the gases to the individual heating trains ( 8 ) and that
• e) vertical binder channels ( 10 ) with height-graded outlet slots ( 11 ) are arranged between the heating cables ( 8 ) for supplying the combustion air to the heating cables.

2. Coking system according to claim 1, characterized in that the connecting channels ( 1 ) between the coking chamber ( 15 ) and transverse channel ( 2 ) are provided outside the filling shafts. 3. coking system according to claim 1 or 2, characterized characterized in that the channels for feed air and discharge of exhaust gas below the heating walls alternately arranged side by side in the longitudinal direction of the furnace are arranged. 4. Coking system according to claim 3, characterized in that each heating wall is assigned a sole channel ( 9 ) for air supply and a sole channel ( 13 ) for heat dissipation. 5. Coking system according to at least one of the previous ones Claims, characterized, that to discharge the heating exhaust gases the flue gas duct is connected to a hot gas blower. 6. Process for coking using the aforementioned coke kungssystem according to any one of claims 1 to 5, characterized in net that the heating in the heating walls continuously is carried out. 7. The method according to claim 6, characterized records that the draft in coking system continuously set using the hot gas blower will.