AU696355B2

AU696355B2 - Method and apparatus for elimination of charging gases that form during coal charging of coke oven batteries

Info

Publication number: AU696355B2
Application number: AU30633/95A
Authority: AU
Inventors: Horst Schroter
Original assignee: Hartung Kuhn and Co Maschinenfabrik GmbH
Current assignee: Hartung Kuhn and Co Maschinenfabrik GmbH
Priority date: 1994-09-20
Filing date: 1995-09-13
Publication date: 1998-09-10
Anticipated expiration: 2015-09-13
Also published as: EP0703289A2; DE4433417C1; DE59509932D1; CA2158615C; CN1132235A; PL180161B1; CA2158615A1; PL310516A1; CZ236195A3; AU3063395A; CZ290867B6; EP0703289B1; CN1053457C; EP0703289A3

Description

1

AUSTRALIA

PATENTS ACT 1990 COMPLETE SPECIFTCATTON FOR A STANDARD PATENT

ORIGINAL

Name of Applicant: Actual Inventor: Address for Service: HARTUNG, KUHN CO. MASCHINENFABRIK GmbH Horst SCHROTER SHELSTON WATERS 60 Margaret Street SYDNEY NSW 2000 a aa aa a aa a aaaa a aa a a a aa a oaa a aa a aa aa a aa a a a a aa a aa aa a Invention Title: "METHOD AND APPARATUS FOR ELIMINATION OF CHARGING GASES THAT FORM DURING COAL CHARGING OF COKE OVEN BATTERIES" The following statement is a full description of this invention, including the best method of performing it known to us:- I la Method and Apparatus for Elimination of Charging Gases that form during Coal Charging of Coke Oven Batteries The invention concerns a method and apparatus for eliminating charging gases that form during coal charging of coke oven batteries.

It is known from Gluckauf, 122 (1986), No. 5, pp. 367-374 that the charging gases that form during coal charging of coke ovens can be fed to the gas collecting main by the partial *2 vacuum created from pressurized water spraying or steam injection via the standpipe of the oven being charged, and via a jumper pipe connectable to so-called ministandpipes on the 10 opposite end of the chamber and traveling by means of the larry car, through the gas collecting space of a neighboring chamber in which relatively little gas is evolved at this point and via its standpipe.

2 In this process the gases are conveyed horizontally to the standpipe through the coke oven chamber. Constrictions for gas flow and thus increased charging gas pressures in the gas collecting space (space above the coal and oven roof) occur on this account primarily at the end of the charging phase and during leveling of the coal. Gas pressures develop on this account within the oven chamber and at the charging holes, which can lead to more or less severe charging gas emissions, which develop mostly at the charging holes between the charging hole frame and so-called charging telescope.

To achieve emission-free or at least low-emission charging despite these conditions it is essential to operate offtake via the standpipe with a correspondingly high partial vacuum.

However, this again means that larger amounts of coal particles are entrained into the gas collecting main and adversely affect the purity of the coal tar.

Since one ministandpipe is required for each chamber on the side of the chamber opposite the main standpipe, the investment costs oIr this method are relatively high; in particular, a corresponding refit of a coke oven battery is possible at best after shutdown of the concerned 15 oven chambers. Each ministandpipe is provided with a cover. Sealing ordinarily occurs with a water bath. In addition to the investment costs for these additional standpipes, a significant cost must be incurred for cleaning and maintenance, since contamination of the water bath occurs during transler of the gas stream and the covers must be cleaned.

A similar generic system is known from US-A 4,004,702 in which the charging gas stream is 20 supposed to be reduced by a constriction on the charging telescope and better distributed in the coke oven chamber, accepting a longer charging time. A transfer device with a jumper S pipe for additional charging gas distribution can be used here.

The underlying task of the invention is to devise a method and apparatus of the type mentioned in the introduction with which emission-free or at least low-emission charging of I -3coal is made possible with comparatively limited technical expenditure and minimal operating costs.

According to a first aspect of the invention, there is provided a method for removal by suction of charging gases that form during charging of a coke oven battery with coal using a larry car, in which the charging gases are fed through a gas collecting space of a neighboring oven chamber and through its standpipe into a gas collecting main of the coke oven battery via both the standpipe of the oven chamber being charged and via a ~.jumiper pipe travelling with the larry car, wherein that part of the charging gas is drawn off via seea rall chrigholes of the coke oven chamber being charged by means of :::Jo1 charging telescopes with annular gap chambers or the like, collecting by means of one or several gas collection lines and sent by means of one or several charging gas transfer telescopes via one charging hole or several charging holes of a neighboring furnace chamnber into its gas collection space and via its standpipe into the gas collecting main of the coke oven battery.

i According to a second aspect of the invention, there is provided apparatus for removal by Suction of the charging gases that form during charging of a coke oven battery with coal using a larry car, when used for execution of the method according to the first aspect with a transfer device arranged on the larry car that can be connected to a neighboring oven chamber, wherein charging telescopes with annular gap chambers or the like are provided for several or all charging holes of the coke oven chamber being charged, that the annular gap chambers or the like are connected via a single or via several charging gas collection lines to a single or several transfer telescopes and that the single or several transfer telescope(s) is/are arranged in a position -3aon the larry car that permits fluid connection of the transfer telescope(s) to a single or several charging hole(s) of neighboring oven chambers and wherein a single or several hot gas blowers or fans with controllable blower output is/are arranged in the charging gas collection line.

Preferably only a single gas collecting main is used, which is preferably connected to all remaining charging holes of the coke oven chamber being charged and is only connected to a single charging hole of a neighboring oven chamber with a single charging gas transfer telescope.

Preferably, the offtake capacity is controlled by recording the pressure and/or 10 temperature developing on the charging telescopes and/or in the gas collection line.

Preferably, the offtake capacity is controlled according to the time trend during the charging time.

Preferably, a single or several hot gas blowers or fans with controllable blower output is/are arranged in the charging gas collection line.

Preferably, temperature and/or pressure sensors are provided on several or all charging telescopes and/or in the gas collection line to control the hot gas blower or ventilator.

In the meaning of the invention a "neighboring" oven chamber is one in which the amount of gas to be taken off in its gas collecting space is so small that the amounts of charging gas transferred to it can also still be taken off; a directly neighboring oven chamber must therefore not be involved, but rather one that is, say, two or three chambers away.

I

-3b- According to the invention part of the charging gases, as known from the prior art, are drawn horizontally into the standpipe of the oven chamber just being charged and firom there sent to the gas collecting main. Charging gases are additionally fed from the oven chamber in the vertical direction via several, preferably via all charging holes, i.e., distributed over the chamber length, into a neighboring oven chamber by means of a special transfer system and from there likewise fed to the gas collection main. Since the charging gas is taken off at different sites distributed over the entire length of the oven, high charging gas pressures that can result in emissions can no longer occur.

The amount of charging gas rises continuously during the charging time (usually i: between 50 and 120 seconds, depending on the charging system and the amount of coal).

The pressure and temperature on the charging telescope is also increased according to this rise. In order to allow for this, according to a modification of the invention the i: offtake capacity is adjusted to the amount of forming charging gas by recording the naturally occurring pressure and/or temperature on the charging telescopes.

I~-I-

4 According to another embodiment of the invention the offtake capacity can also be controlled via the time trend during the charging time.

The transfer system according to the invention is lilly installed on the larry car and consists of the following components: charging telescopes with annular gap chambers for vertical charging gas offtake from the oven chambers; a preferably single charging gas collecting main connected to the annular gap chamber; a preferably single charging gas feed device in fluid connection with the charging gas collecting main, preferably a blower, like a hot gas blower with preferably controllable volume capacity, as well as a preferably single charging gas transfer telescope for fluid connection of the charging gas '*collecting main to a preferably single charging hole of an oven chamber adjacent to the oven chamber being charged.

.In addition, the following is advantageously provided: 15 at least one plenum cooler for charging gas temperature reduction of the charging gases being transferred; shutoff dampers in the pipeline system between the charging telescopes and the transfer telescopes; temperature and/or pressure sensors for blower regulation or control.

The oven roof of the charging hole of the neighboring oven chamber, through which the corresponding part of the charging gas is transferred into the gas collecting space of the neighboring oven chamber, is raised with an electromagnet incorporated in the transfer telescope or by means of a device outside of it and repositioned after completion of the transfer process. The charging hole of a neighboring oven chamber to be used for charging gas transfer can be chosen corresponding to the space relations on the larry car A limitation of the transfer site to the coke side, as in the known jumper pipes, drops out, any of the, say, 3 to 5 charging holes of one of the neighboring oven chambers can be utilized.

Preferably the transfer site lies close to the standpipe in order to achieve the least possible pressure losses.

A particular advantage of the invention is that the charging gas transfer telescope according to the invention can be a relatively simply designed device in which it is merely ensured that a sufficiently gas-tight connection can be produced between the preferably single charging gas collecting main and the preferably single (coal) charging hole of the "neighboring" oven 15 chamber. Sealing and handling problems, like those that occur in the known jumper pipes and are especially troublesome during spanning of several oven chambers because two gastight pipe connections must be made simultaneously, do not occur in the charging gas transfer telescopes according to the invention.

The invention is further explained below with reference to the drawing.

20 Figure I shows a perspective schematic cutaway of a coke oven battery with charging gas extraction; Figure 2 shows a schematic view of a charging gas transfer telescope according to the invention partly in vertical cross section -6- It follows from Figure I that a coke oven chamber 100 of a coke oven battery 101 is charged with coal 30 by means of a larry car 103 traveling on rails 102 on the roof of the coke oven, in which a gas collecting space 31 remains beneath the coke oven roof 32, As indicated by arrow A, part of the charging gases are withdrawn via charging holes 1, 2, 3 and 4 into a known charging telescope with annular gap chambers 5, 6, 7 and 8 (see detail in Figure la).

For reasons of clarity only charging telescopes 5 and 8 are shown schematically. The charging gases are conveyed through the annular gap chambers to a gas collecting line 9, S1, 17 and 20 via pipelines with shutoff dampers 12, 13, 14 and 15. The charging gases are cooled in a so-called plenum cooler 16 as required. A hot gas blower 18 with controllable drive 19 in arranged behind plenum cooler 16 The charging gases are then fed via line and a charging gas transfer telescope 21 to a charging hole 22 of a neighboring oven (Figure 2) and, as shown by arrow C, drawn into the gas collecting main 24 of the coke oven battery via a standpipe 23.

The other part of the charging gases, as shown by arrow B, are drawn into the gas collecting 15 main 24 via a standpipe Because of division of clharging gas offtake according to the invention pressurized water spraying or steam injection into the standpipes can be reduced so that energy is saved and discharge of coal particles is reduced, Figure I a shows a cutaway enlargement of the charging telescope with annular gap chamber 20 5. The right half of the figure shows the charging telescope in the lowered position and the left half in the raised position The charging telescope 5 consists of flexible seal SA, two telescope tubes 5B and 5C and a sealing ring 5D that can mounted gas-tight on the opening of charging hole I for the charging hole frame on oven roof 32 Telescope tubes 5E and are arranged in telescope tubes 5B and SC so that an annular gap chamber R opened downward is formed on one side between telescope tubes 5B, SC and on the other side between telescope tubes 5E, SF, to which a pipeline 5G is connected, which is connected to -7gas collection line 9. Coal is charged into the coke oven chamber 100 via telescope tubes and 5E through a coal feed device 5IH (arrow D) The charging gases, as shown by arrow E, are withdrawn into the gas collection line via annular gap chamber R and pipeline As is apparent from Figure 2, a charging gas transfer telescope 2 i preferably rigidly connected to each individual charging gas collection line 20 consists of a flexible seal 21A, two telescope tubes 21 yid 21C and a sealing ring 21D that can be mounted essentially gastight on the opening of a charging hole 22 for the charging hole frame on the oven roof 32.

An automatically functioning charging hole cover lifting and placement device is preferably provided in the region of the charging gas transfer telescope on larry car 103 but is not expressly shown in Figure 2, since it is known.

List of Reference Numbers 1 Charging hole 2 Charging hole 3 Charging hole 15 4 Charging hole 5 Charging telescope 5A Flexible seal Telescope tube 5C Telescope tube SD Sealing ring Telescope tube 5F Telescope tube Pipeline 6 Charging telescope 7 Charging telescope 8 Charging telescope 9 Pipeline 8 Pipeline II Pipeline 12 Shutoff dampers 13 Shutoff dampers 14 Shutoff dampers Shutoff dampers 16 Plenum cooler 17 Pipeline 18 Hot gas blower 19 Controllable drive Pipeline 21 Transfer telescope 21A Flexible seal 21B Telescope tube 21C Telescope tube 21D Sealing ring 22 Charging hole 23 Standpipe 24 Gas collecting main Standpipe 30 Coal 31 Gas collecting space 32 Coke oven roof 100 Coke oven chamber 101 Coke oven battery 102 Rails 103 Larry car A Arrow B Arrow sc r s a s o e r r e Arrow Arrow Arrow Annular gap chamber

Claims

1. Method for removal by suction of charging gases that form during charging of a coke oven battery with coal using a larry car, in which the charging gases are fed through a gas collecting space of a neighboring oven chamber and through its standpipe into a gas collecting main of the coke oven battery via both. the standpipe of the oven chamber being charged and via a jumnper pipe travelling with the larry car, wherein that part of the charging gas is drawn off via several or all charging holes of the coke oven chamber being charged by means of charging telescopes with annular gap chambers or the like, collected by means of one or several gas collection lines and sent by means of one or several charging gas transfer telescopes via one charging hole or several charging holes of a neighboring furnace chamber into its gas collection space and via its standpipe into the gas collecting main of the coke oven battery.

2. Method according to Claim 1, wherein an offtake capacity is controlled by recording the pressure and/or temperature developing on the charging telescopes and/or 15 in the gas collection line.

3. Method according to Claim 1, wherein an offiake capacity is controlled according to the time trend during the charging time.

4. Apparatus for removal by suction of the charging gases that form during charging of a coke oven battery with coal using a larry car, when used for execution of the method according to any one of the Claims I to 3 with a transfer device arranged on the larry car that can be connected to a neighboring oven chamber, wherein charging telescopes with annular gap chambers or the like arc provided for several or all charging holes of the coke oven chamber being charged, that the annular gap chamnbers or the like are connected via a single or via several charging gas collection lines to a single or several transfer telescopes and that the single or several transfer telescope(s) is/are arranged in a position on the larry car that permits fluid connection of the transfer telescope(s) to a single or several charging hole(s) of neighboring oven chambers and wherein a single or several hot gas blowers or fans with controllable blower output is/are arranged in the charging gas collection line.

Apparatus according to Claim 4, wherein temperature and/or pressure sensors are provided on several or all charging telescopes and/or in the gas collection line to control the hot gas blower or ventilator. 10

6. A method for removal by suction of charging gases that form during charging of a coke oven battery with coal using a larry car substantially as herein described with reference to any one of the accompanying drawings.

7. An apparatus for removal by suction of the charging gases that form during charging of a coke oven battery with coal using a larry car substantially as herein 15 described with reference to any one of the accompanying drawings. DATED this 20th day of July 1998 HARTUNG, KUHN CO. MASCHINENFABRIK GmbH Attorney: RUTH M. CLARKSON Fellow Institute of Patent Attorneys of Australia of BALDWIN SHELSTON WATERS I ABSTRACT In an apparatus for removal by suction of the charging gases that form during charging of a coke oven battery (101) with coal (30) using a larry car (103) with a transfer device arranged on a larry car that can be connected to a neighboring oven chamber (100), the charging gas emissions are reduced with relatively limited technical expenditure and minimal operating costs in that known charging telescopes with annular gap chambers 6, 7 and 8) or the like are provided for preferably all the charging holes of the coke oven chamber being charged, that the annular gap chambers or the like are connected via a preferably single charging gas collection line to a preferably single transfer telescope (21) and that the preferably single transfer telescope is arranged in a position on the larry car that permits fluid connection of the transfer telescope to a preferably single charging hole in the neighboring oven chamber. S *e oe*