DE2016205B - Method and device for equalizing the gas pressures of lock chambers and furnace space of shaft furnaces, in particular of blast furnaces - Google Patents

Description

7. Device according to claims 5 and 6, lock chamber and furnace space or atmosphere characterized by a raw gas reservoir (22) to be carried out, so that the pressure in the sluice transmitter with catchers (25, 26) for the ent- 45 in the gas chamber is an amount less than that in the retained dust is provided. neighboring room, becomes dusty furnace gas

8. Device according to claims 5 to 7, blown through the gap between the bell and bowl, characterized by very different It is possible that with appropriate gap formation Diameter of the clean gas and the raw gas - the gas velocities up to the sound velocity lines (18, 32), the raw gas line (32) increasing 50 speed. This state then exists in each case has the larger cross section (33). over the period of sealing in a cycle,

of the measures »Enter«, »Save to

the distributor bell "and" charging the furnace "

The invention relates to a method and to a provision. The split times can be vast Exercise particularly useful equipment results in 55 borrowed lengths. Fast flowing gas increases device to equalize the gas pressures of locks due to the dust carried along by the wear chambers and furnace chamber of shaft furnace, in particular. Usually such a current can be sheared those of blast furnaces, in which the raw blast furnace gas cannot be prevented because the gout dem The furnace chamber is first cleaned and then locked in the bells under the heat load is given. 60 draw. The exact pressure equalization is therefore one

Well-known shaft furnace, such as. B. blast furnaces, have important measures to maintain the Dichteine made up of two or more bells and two or more acting on gout occlusions. It is very difficult Topping bowls formed seal on the furnace head. a fast enough and even more precise Two bells lie on top of each other and the upper one is pressure equalization in a two-bell or multi-bell smaller and serves to distribute the loading 65 gout seal. That from the furnace good on the big lower bell. The large originating gas must at least one Vorentstaubunj Bell is to be subjected to the upper furnace diameter in order to reduce the pressure in the duct true, being careful not to damage the circular feed-determining valves. It hits

3 - 4

Suddenly, as a rule, an unavoidable pressure- the reason for which an exact pressure equalization is carried out-

wlusl in the air extractor. This can be men.

would the use of dust-free foreign gas is known to the pressure difference with all

justify simply accepting disadvantages. It is also

Dust-free and at high pressure in the plant network 5 Dekuiini, a compressor to be pre-lumined into the clean gas network, e.g. nitrogen, offers pre-sounding that brings the pressure so high that identical parts for failure-insensitive operation, at the same time when the shut-off devices are opened the necessary distance from the wear of the shut-off device and the acceleration of the gas is achieved. According to the invention is met. The control and generation effort is provided, however, that the lock chamber Ui are very high because Siclierheitsvorkchriingen io a first pressure stage must be unetrofi'en with purified furnace gas in order to fill the lock chambers indirectly from the cleaner, and in one before the application To maintain a quantity of blast furnace gas at relatively low pressures well above the design second pressure level. A lack of volume, but of furnace chamber pressure for safety, remains even with complex safety measures. Even when standing for. the smaller gas volume of the second stage is a com-

When using the pressor produced by the furnace, this one is very small, and it does Top gas to increase the pressure in the lock - existing clean gas can be processed, Chamber has so far been for reasons of otherwise to Unless raw gas from the furnace chamber is used high wear and tear the furnace gas is cleaned. Depending on the 20 because of the small amount much cheaper Ver-ArI cleaning in different available ratios. These allow a number of understanders Enistaubuiigt> Voi directions occurs Pressure improvements. There is a particular benefit to a residual waste compared to the furnace gas pressure. To be able to accelerate in a gas volume of higher pressure. Some of the ovens built are satisfied with the pressure-releasing method according to the invention Available pressure. Another example makes use of the knowledge that In part, an additional compression was planned after the lock chamber was filled with Gewozu however, for various reasons, in turn, purified furnace gas from the pipeline network behind the only purified furnace gas is allowed. Pressure cleaning, but before the furnace pressure control

It is also already known (USA.-Patent rungsorgan, the pressure difference to the furnace pressure

3 276 757), purified top gas from the top gas 30 is a maximum of 2000 mm water column, usually only 500 to

cleaning via a compressor in a gas storage tank 1000 mm water column. The gas volume fraction, which is necessary

to transfer from where the cleaned gas is manoeuvrable to equalize in the lock chamber

controls is filled into the lock chamber. Achieving the same pressure as in the furnace chamber is then

here, the one caused in the furnace gas cleaning only needs a few cubic meters, like the following calculation

Pressure drop is compensated by the compressor 35 shows:

the. The lock chamber is exclusively the volume of the lock chamber minus the volume of the

with purified furnace gas or foreign gas (inert- „. ~ _{T /} _ ~ _na

gas). The known method is therefore tinsatzstotte ^ - ^to m

due to the additional compression in a grain gas temperature ί - 50 C

40 operating pressure P = 3.0 ata

doors marked. The performance of compressor pressure difference Ap = 1000 mmWS

and the gas storage tank must, because of the large volumes, atmospheric pressure p ₀ = 1.0 ata

the lock chamber set uncomfortably high ".". , " _C

will. The known facility requires? off- difference volume, to furnace-

finally work with purified gases Iu. The 45 ^ko P ^{fdruck to} achieve .... A F ₀ [Nm ³ ]

Facility is therefore from the side of the effort a) Amount of gas until the pressure is reached

considered unfavorable. ρ = 2.9 ata:

Both methods of pressure equalization in the 973 2 9

Lock chambers have certain deficiencies. Im F ₀₁ = 20 - = 49.05 Nm ³

first case occur at the sealing seats of the bells 50 323 1.0

and bowl the mentioned high gas velocities. J ₃ ) Amount of gas until the pressure is reached

on. Even when using sealing flaps, ρ - ■ $$ _a t _a;
whose sealing seats are outside the path of the loading

the dust is unpleasant. It is F., = 20 · · --- = 50.70 Nm ^{; i}
therefore always a greater or lesser 55 "323 1.0 wear
Scope present. In the second case, the additional y _ y _ y = 1 ^ 5 N _m 3 leads
Lent compression that becomes necessary to ongoing 0 02 01>
high operating costs and endangering the in- The calculation is based on a furnace chamber part, since for reasons of the compressor dimensional pressure of 2 atm. It is therefore only necessary to refill ir sionation and the relatively short pressure equalization of the second pressure stage 1.65 Nm ³ with pressures above the design pressure of a pressure of 2 atmospheres. In practice, the after-gout closure must be worked. filling only represents an impulse to be triggered in time

Wear is particularly severe, with the amount of gas being automatically limited,

if to distribute the goods in the furnace chamber it is always advantageous if the furnace gas is dei

such gout closures are still used, the 65 second pressure stage raw gas from the furnace chamber ent

use the bells. is assumed that is saved before switching on

The present invention has the task of being reassured. It becomes the downside to de

erunde. to propose a method and means of reducing the abrasive effect of dust particles

their simple excretion avoided. The output Δ F ₀ [Nm ³ ] with constant lock ridge filling

separation takes place when the gas is at rest. volume depending on different pressure

This step of the invention is particularly valuable. differences compared to the furnace top pressure;

Namely, if the dust particles at the high loading F i g. 4 is a graph for gas volume

take part in acceleration, they form initially 5 Δ F ₀ [Nm ³ ] with a constant pressure difference ρ mmWS

high flow velocities (well over 100 m / depending on the filling volume of the lock

sec) dangerous abrasives. The large kinetic chamber F [m ³ ].

Energy of the dust particles, the grain diameter of which according to FIG. 1 are the lock chamber 1 and

can be up to 10 mm, caused in particular the furnace space 2 of a blast furnace on top of one another

large abrasion effects on pipe deflections and io for the purpose of supplying the load without loss of gas pressure

Individual resistors such as B. represent valves. consignments from the open atmosphere to the

Certain dusts, such as B. coke burrs stand out furnace space 2. The material passes through a with the

also characterized by great hardness. Sealing flap 3 closed, shown opening in

A simple elimination by calming the the lock chamber 1. There it is on the flapping flow is also supported by the fact that a 15 pen 4 and 5 jammed until drained by a The opening, which is closed with the sealing flap 6, is stored several times greater than the amount of raw gas as required for a pressure equalization process. The distribution of the goods takes place on the is borrowed. Distribution bell 7 instead, which is arranged in the furnace head

The separation of dust particles from raw gas is. Other distribution devices can also be used

can be additionally supported by being provided in FIG. The resulting in furnace space 2

Second pressure stage a lower flow furnace gas is through gas discharge pipes 8, 9, 10 and 11

speed in the storage space is maintained. discharged. The over the circumference of the furnace head

The device for carrying out the method lead ordered gas discharge pipes 8, 9, 10 and 11 is characterized by an explosion valve 14 to the furnace chamber. Another exhaust pipe connected storage space for crude gas, from 25 to 12, also with a safety valve 13 a shut-off pipe to close the lock is used to blow off when the system is shut down or Chamber of the top seal runs, which also commissioning. The raw gas passes through the gas means of a furnace gas cleaner with clean gas supply outlet pipe 15 into the cleaner 16. The cleaned is cash. The storage space serves in addition to its radio furnace gas flows through the throttle wall 17 the purification, To store raw gas as energy storage. Of 30 gas consumers too. From lock chamber 1 The last remainder of the intended amount of lock gas can be the lock gas through the discharge line 19 and can be pushed into the lock chamber more quickly, the valve 20 can be drained when the seals become. With the help of a pressure wave, the filling flap 3 is to be opened to the loading Lock chamber relieved. well let in. The not yet relaxed clean gas

To increase the operational safety also serve 35 is in front of the throttle wall 17 in the line 18 through

Supply lines connected in parallel from Rei the shut-off device 21 can be regulated. A control impulse

niger and raw gas storage, each with shut-off only takes place if for the purpose of pressure equalization between

Organs in front of the entrance to the lock chamber of the lock chamber 1 and the furnace chamber 2 of the

are provided. In the event of defects, a single pressure difference can be used to compensate for this. The

flow valve can be switched to the other. 40 raw gas, which via the gas exhaust pipes 8, 9, 10, 11

However, the parallel connection also allows the up and 15 to flow into the cleaner 16, depending on the situation

the pressure waves of clean gas and its nature a pressure drop follow one another. It therefore stands

coarse dedusted raw gas to be finely controlled. at the shut-off valve 21 with lower pressure

The ejection of the dust is made possible by an additional option. To this end, the invention provides the memory Feature of the invention by a raw gas 45 space 22 in front of the pipe 23 with raw storage which is supplied with catch containers for the in the gas. The raw gas can be the storage gas contained dust is provided. It is not flow through the room 22, but is through A specialist recommended either the dust with the shut-off element 24 dammed. Fall in the traffic jam To hold containers or just to guide him back the dust particles over the labyrinth plates 25 or the like a riser pipe that carries the raw gas. It consists of 50 borrowed catch containers with projections 26 from the beauch the possibility of the dust elsewhere removed mass of the raw gas. Unless the pipeline with a separate dust tube runs steeply into the furnace head 23, the dust falls to be returned to the gas vent. tubes 9 and into the furnace chamber 2 back. Now kick that

The invention also provides for greatly differing requirements for pressure equalization if the diameter is the clean gas line and the raw gas 55 blocking element 21 open for the clean gas, which is stored at before, whereby the raw gas line came to the larger opened non-return valve 27 the lock Has cross section. The raw gas therefore flows with mer 1 fills. As well as the pure gas blast wave to ebb away greatly reduced speed. As a result, the shut-off element 24 opens the dust particles more easily from the raw gas. and the dedusted raw gas presses into the pipeline

In the drawing, exemplary embodiments of FIG. 60 are shown in FIG. Before unpurified raw gas flows in

The device according to the invention is shown schematically, as a result of the process, the shut-off element 21

represents and explained in more detail below: closed, so that there is always a cycle after the grain

F i g. Fig. 1 shows in elevation the device on a command of the pulse of measuring pressure differences

Blast furnace top seal, the lock chamber of which drains the control unit 29. The valve 30 on de

is provided with flaps; 65 Branch line 31 is used to vent the pipe network

F i g. Fig. 2 shows the device in elevation on one at a standstill.

Bell gout lock; The allocation of gas quantities does not need to be carried out

Piij is a diagram for the gas volume of a common pipeline28 to be made. It v,

however, it is advantageous to connect the clean gas line 18 and the raw gas line 32 in parallel.

The lines 18 and 32 can be different in diameter. The raw gas line 32 can have a much larger diameter or cross section 33. The determination is made according to the Flow rate and according to the desired pressures.

According to FIG. 2, the gout seal consists of the three gout bells 34, 35 and 36. Together with the gout bowls 37 and 38 is one each

Lock chamber 1 formed. The clean gas line 18 and the raw gas line 32 lead the gas separately to the lock chamber. The pressure equalization process is otherwise the same as already described.
From the F i g. 3 and 4 values for the residual gas volume of the second pressure stage for different pressures of the clean gas can be read off. Differences in pressure arise depending on the use of certain cleaning agents. The residual gas volume resulting from different pressures depending on the size of the top closure are shown in FIG. 4 can be found.

1 sheet of drawings

Claims (6)

Claims: for the property to be distributed. The distribution function is 1. The method for equalizing the gas pressures is therefore decisive for the choice of the different of lock chambers and furnace chamber of bell diameter. It is because of the warm-bean chutes In particular of blast furnaces, if it is bad, the lower bell is larger to dig the crude furnace gas from the furnace chamber. The distribution of the goods, however, determines ntichst cleaned and then in the lock - the furnace corridor and thus the work result, the chamber is given, thereby marked- function of distributing comes a higher degree than draws that the lock chamber in one of the function of sealing, nevertheless has one first pressure stage with purified furnace gas, poor seal on the furnace top because of blast furnaces is filled indirectly from the cleaner, and in the io of the recently increased pressure of importance second pressure stage a furnace gas quantity obtained. The higher gas pressure in the furnace chamber relatively small volume, but from furnace- from blast furnaces and other furnaces that even with Working room pressure to completely equalize the pressure between negative pressures (stone kilns) causes a Lock chamber and furnace chamber switched on Support of the chemical-physical processes, will. is This is how a higher pressure in blast furnaces affects the 2. The method according to claim 1, characterized in that the iron ore reducing process is positive. To the indicates that the top gas closures are used as the top gas of the second pressure-sealing effect Stage raw gas taken from the furnace space increased requirements. is saved before switching on and the two-bell gichl lock can is calmed down. ao both gout bells are only operated when the 3. The method according to claims 1 and 2, pressure above and below in the through a gout thereby characterized in that a lock chamber formed around the multi-bowl is of the same size. times larger amount is stored than for. Therefore, when the upper bell is opened, in a pressure equalization process is required. the gout bowl below atmospheric 4. The method according to claims 1 to 3, 25 pressure prevail, that is, the pre-existing there characterized in that the second pressure is lowered by releasing the gas.
On the other hand, the pressure in the lock end in the storage space must be maintained. chamber should be pretty much the same size as the furnace chamber 5. Device for carrying out the expiry pressure when the lower bell jar with economical rens according to claims 1 to 4, marked 30 should be open to reasonable energy expenditure. for net by one to the furnace chamber (2) - each furnace chamber loading as well as for loading senen storage space (22) for raw furnace gas, from the large bell there is pressure equalization in the between which requires a lockable pipe (28) to the two bells lock chamber (1) of the gout seal lent. The gas used for this can in principle runs, which also by means of a furnace gas cleaner 35 the gas or foreign gas originating from the furnace (16) can be supplied with clean gas. may be.:. The furnace gas from blast furnaces is very dusty 6. Device according to claim 5, marked marked, but correspondingly cheap and required net thanks to supply lines connected in parallel - a small amount of additional equipment gen (18,32) from cleaner (16) and rolling gas storage. The dust entrained in the furnace top gas each with shut-off devices (21, 24) in front of 40 causes great wear and tear on the sealing seats of the non-return valve (27) in the Schleusenkam bells and gout bowls. Unless it succeeds mer (1) are provided. the greatest possible pressure equalization between