JPS5834111A - Supplying method for hot wind - Google Patents

Abstract

PURPOSE:To reduce a changingover time while preventing the overloading of flue valves and protecting said valves through simple improvement in the stage of changing over >=3 units of hot stoves successively from the state of supplying hot wind to the state of combustion by specifying the operations of the air releasing valves of the changed over furnaces and the valves relating to combustion. CONSTITUTION:In the case of changing over the H1 of hot stoves H1-H4 to a combustion state while the H1 is in precedence, the H1, H2 are in the state of supplying hot wind and the H3 is in the state of combustion, the signal (a) for preliminarily announcing the completion of the state of supplying hot wind is emitted. First a blast valve 7 is closed, and upon completion of the closing, a hot air valve 9 is closed and upon completion of said closing, a wind releasing valve 4 is opened. The drop in the internal pressure of the stove H1 in accordance with these valve operations is detected with an infurnace pressure detector 23. When said pressure drops down to a set value or under and a stove changeover signal to the state of combustion is emitted, a signal (b) for preliminarily announcing the changeover is emitted. Thereafter, with the valve 4 held opened, a flue valve 5, an air valve 3, a gas shutoff valve 2 and a gas valve 1 relating to combustion are opened in this order, and when the valve 5 is fully opened, the valve 4 is closed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention operates eight or more hot air stoves by sequentially switching between a combustion state for heat storage and a hot air supply state. 1 and the other hot air stove t-ff1 in the dawn state S, and at the time of switching, ν and switch from the hot air supply state to the combustion state 1Vc, the exhaust pressure valve 1kli@< of the hot air stove to be switched to the darkness state. .

In contrast to the above hot air supply method, conventionally, wI.

As shown in the time chart in the figure, in order to switch the hot air supply state to the hot air F(at) 1km sintering state, the hot air supply-related blower valves (71 and l1kJIL valves (-) are closed sequentially and then the KW The pressure inside the furnace is lowered by increasing the pressure in the furnace (4), and the pressure difference across the closed hot air valve 191 is increased.
KL to prevent the hot air valve (9) from vibrating due to
, When the pressure inside the furnace becomes below the pressure plate, which is close to atmospheric pressure, due to the opening of the exhaust pressure valve (4), the exhaust pressure valve (4) is opened.
4), the exhaust pressure valve (4) is fully closed, and the furnace switching signal from the programmed automatic control mechanism or the previous furnace switching signal is being transmitted. After transmitting the warning signal Cbl of the remains of the furnace, the combustion-related smoker *iIl,?! Air valve a), gas cutoff valve (ri) and gas valve (1) are opened in their respective positions. As shown in Fig. 10, before sending out the furnace switching notice signal, the charging valve (・) and the blower valve (1) are activated.
), if the pressure inside the furnace exceeds the set value due to the closing of the exhaust pressure valve (4) due to leakage of the hot air valve (9) or breathing action inside the hot air furnace, the above-mentioned - open valve (1+) will close. To prevent overload on the drive device, and to maintain the exhaust pressure (Il), the combustion-related valves fit, il+, +11, (1) are interrupted and the exhaust pressure valve (4) t- Open the valve again,
When the pressure inside the joint furnace falls below the setting, the Ippenbenen valve is opened, and when the Smokefurnace valve is fully closed, the exhaust pressure valve (4) is opened.
) t-closed, and 22gIL valve garden and gas cutoff valve f
1+ and gas valve full in sequence. I'm trying to make it 1 sho.

However, because the cycle times for each of the hot air supply state and the combustion state after furnace #JJ1111 preheating are set, When the furnace pressure shown in Fig. 10 is controlled to be lower than the setting, the time opening rl゛+9 until the furnace pressure is controlled by VC below the setting will enter the combustion state IIVc with a delay. There was a drawback that the opening time during heat storage was shortened by the amount of time, resulting in insufficient heat storage and a decrease in hot air supply efficiency.

Real #! In view of the above-mentioned circumstances, A aims to eliminate the above-mentioned drawbacks through simple improvements while preventing overload on the driving device of the refill valve and preserving the smoke valve. Next, the hot air supply Wt* used in the method of the present invention will be explained based on illustrative drawings.

Fuel gas supply *11 fuel and 100tBf1 consisting of til+ and combustion air supply pipe-4 connected to combustion device ■
4'M7! 4 hot air stoves (Ht) J('*) , (kis) , (a
n), and each of these furnaces (11), (kil), (H
l), (town), there is a condominium pipe Oη that connects to the owner of the connection to Susaki,
The air blower vCA which communicates with the main air pipe Il from the blower blower O-, the hot air pipe @t1 which communicates with the hot air supply main pipe for hot air supply objects such as pot furnaces, and the above-mentioned gas supply pipe till. The gas valve [11 and the gas shutoff valve (2) are connected to the air supply i# t12i K g! Air valve tll k, -〇 period smoke tube exposure η to the great pole + Kl
, 111 and a small value exhaust pressure valve that bypasses 10,000 + 41
1, a large diameter blower valve (1) and a blower control valve (all and a small pressure valve (6) to bypass them) are installed in the front delivery wind pipe, and a hot air valve 19 is installed in the hot air t@. ), and a furnace internal pressure detector @ for detecting the internal pressure of the heat storage 11-.
T&Keruto K.

The various valves are set to mm according to the time chart shown in FIG. H□), (Hl).

(Iix) and (H4) are configured to operate in a combustion state for heat storage and in a hot air supply state. The first and second am wind furnaces ("t), (lIg) are at the hot air supply efficiency, and
8th hot wind? (4) precedes the 8th and 4th hot air F (Ml
), (H4) is in the combustion state, its %l hot hot air <
nt ) to switch to combustion channel III@t%
This will be explained based on the time chart shown in FIG.

A signal iml for notifying the completion of the hot air supply state is transmitted according to the cycle setting, and the warning signal 161 t
An operation signal to stop the hot air supply is sent by manual operation set to f* or by automatic axis m operation from the setting set by Gummigram, and first the blower valve (7) is closed. The hot air valve (・) is closed based on the completion of closing, and then the exhaust pressure valve (4) is opened when the exhaust pressure valve (4) is opened. The decrease in internal pressure is detected by the reactor pressure detector (inner reactor), and the reactor pressure detector is less than α81, and the setting is set by human operation or by programming. If a signal to switch the furnace to combustion mode is sent by @motion control 1 command from the container, gllP will notify the furnace switch to transition to combustion mode.
After that, the exhaust pressure valve (4) is opened, and the combustion-related smoke valve (@), air valve (S), gas cutoff valve (2), and gas valve (11t) are opened. At the same time, when the above-mentioned smoke valve (6) or all!ia is reached, iii′
] Close the exhaust pressure valve (4).

In other words, leave the exhaust pressure valve (4) fully open and open the hot air stove (Hl) to switch to combustion.
By making the lid 111 open, the time required for the furnace to reach the combustion state is surely shortened while preventing overload on the drive device 11tK of the cable valve (-) and ensuring the maintenance of the valve valve (-). can do.

In the same way, before opening the exhaust pressure valve (4), the hot air supply is stopped and the H & sintering state is switched! It would be good to supply the residual pressure of @1 hot air Hl) to the 8th hot air furnace (Hl) which should be transferred to the 5th heat jL supply status, and for a long time, that alb! Eight L-shaped deformed desks are shown.

That is, the - shown in Figure 48 are the first and 188th hot air stoves (Hl), (''s), and the second and fourth hot air stoves ('s).
*), (klt) are connected to each other by a pressure equalizing pipe -1@4, and a pressure equalizing valve (lOa) is connected to their '#n, (to).

(10b) As shown in Figure 6, the pressure equalization valve (10m) is opened at j&- when the hot air valve (9) of the first hot air stove (kit) is closed. At the same time, the pressure difference (
ΔP) 5e Furnace internal pressure run-in - A, A detects it, and when it becomes VC below the setting, closes the pressure equalizing valve (10a), and at the same time closes the pressure equalizing valve (10a), starts w11 hot blast furnace ('
Ht ) exhaust pressure valve [4) and the light pressure valve of No. 8 hot stove (Hl) (m = hot air valve 18) and blower valve (7) are opened in sequence, and the first heat storm de(!(
When the furnace ratio of +) is less than 1g, the PC shows the furnace cutting fault number to 1g, and the exhaust pressure * f41
I open the fudatsu valve (6) at 11 which is open, and when the VC is fully open, the exhaust pressure valve i411 is closed,
The air valve (1), the gas release valve (2), and the gas valve (11t) are closed at the same time.凰l” (”*)
is the transition from rest to blowing, and both hot air F(”s),
(1!s) is multiplied by a.

Moreover, the one shown in FIG. 4 has a si
Connect the branch pipe - through the v'+ valve -, and also connect the light pressure valve (
・) is the intervening tube (goods)... [tl'' is written at the end of the tube! As shown in Fig. 7, before the supply of hot air from the first hot blast furnace (11) is stopped, the pressure charging valve (@) is opened, and the blower valve (M) is opened. The hot air valves ill are closed in that order, and when the hot air valve (9) is fully closed, the light pressure valve (6) of the 4!18 hot air stove (also) is opened, and the 1st and 8th hot air stoves (Hl) are opened. , (horse) is a closed pipe with the branch pipe - and photo piezoelectric (goods) * Punishment VC1 causes delayed overpressure equalization, and the furnace pressure difference (ΔP) between the inner furnace (Ht) and (mo) is below the setting. At the point when
) and temporarily open the on-off valve @, before!
When the pressure inside the first hot air stove (Hl) becomes lower than the set value K (K) with the opening of the exhaust field valve (4), and the furnace switching signal to the combustion state is being sent, the exhaust pressure valve (4) is opened. Leave the smoke valve (4) open and open the smoke valve (6), and when the smoke valve (6) reaches 1llll, open the exhaust pressure valve.

(4), and open the air valve (3), the gas cut-off valve -(!j, and the gas valve Tl1t.
In this case, the internal hot stove (Hl), (H,)ri,
They are connected by the same overroot as in the previous ohm example.

Furthermore, what is shown in FIG. nK
At the same time, connect the branch pipe through the valve (II opening/closing device) and interpose the exhaust pressure valve (4) to connect the round pipe to the 1CI flue branch pipe @ 411! As shown in Figure 8, the combustion stopped due to the hot air F(ill).
111, the exhaust pressure valve 14) is opened, and when the hot air valve (9) in the clam 1 hot blast furnace (Hl) is fully opened, the exhaust pressure valve (4) is opened, and the branch pipe of the closed pipeline and the exhaust pressure pipe are opened. ,
1st and 8th thermal furnace (ML)/CHs)k by g4
Delayed pressure equalization is performed, and when the pressure difference (ΔP) between the inner furnace (nt) and ('s) becomes below the setting, the exhaust pressure valve 4) of the third hot blast furnace (Hl) is closed. At the same time, when the exhaust pressure valve (4) is fully closed, the light pressure valve (1) and -closing valve- are temporarily engaged, and the hot air valve (9) and Pass the blow valve (7) through the request Vcl!l,
Chiku, 1st thermal phoenix P (jil) Kν, detection @(
2) When the detected value of the furnace pressure falls below a certain value, the furnace is switched to the combustion state. If th is a low value, the exhaust valve (4) is left open and the exhaust valve tit is opened;
When the exhaust valve (Il) is completely closed, the exhaust pressure valve (4) is closed, and the !2fi valve (1) and gas valve (!l and gas valve (1) are opened).

In addition, in any of the above-mentioned implementation WAs, the combustion condition 1
The furnace filtration pressure of the hot air stove (Hl) to be transferred to 1 is below the setting vc
Then, immediately take the action to open the flue valve (illk), and then close the exhaust pressure valve (4).
At any point until the valve ill which opens at the end of the 1mM valve stops, a detector and a timer are used to determine whether or not the pressure inside the furnace has fallen below the R foot plate. The specific hand board can be changed in various ways, such as by combining the & foot board downward movement for setting 1iiPm5 to know the important points, or by setting it to know only by a timer.

In summary, the present invention provides a method for supplying hot air, in which gJ is changed from the hot air supply form to a soft combustion theory.
When the exhaust pressure valve (4) is opened and the pressure inside the furnace is below the foot plate, the exhaust pressure valve (14) is opened. , Close the exhaust pressure valve (4) until the combustion-related valves (set, isl * tx) and (1) after soldering are completed.
Features.

In other words, by a simple improvement such as closing the exhaust pressure valve (4), which is opened when switching to the l1la condition, at the above-mentioned timing, the internal pressure of the hot stove to be switched to the combustion condition can be reduced. Once it falls below the setting, even if you close the Km road valve (@) immediately or after a short time, it will not drop below the setting.
As a result, it is possible to prevent overloading of the wax on the front of the fly valve (-) and to prevent the smoke valve (61
It is now possible to quickly and reliably shift a hot air stove from a hot air supply method to a soft combustion method while ensuring sufficient heat storage, and it has become possible to eliminate the deterioration in hot air supply efficiency due to insufficient heat storage. became.

[Brief explanation of the drawing]

Figure Ifi#'i illustrates the implementation of hot air supply Ve direct used in the method of the present invention, Figure 1 is a system diagram, and Figure 8 is a diagram of various valves.
1111M11111141 time chart, 48
Figures 1 to 1 are system diagrams of the large-scale embodiment, and Figure 6 is a time chart of valve opening and closing. FIGS. 9 and 10 are system diagrams of conventional methods, respectively. (1)・t1+, 1B1・m...Fuel m related valve, +4)...Exhaust pressure valve, (Ml) ~ (H4)・
...Hot stove. Voluntary procedure Amendment 1 Indication of the case 181948 Patent application No. 181948 2 Name of the invention Hot air supply method 3 Relationship with the person making the amendment Patent Applicant address Shikitsu Higashi, Naniwa-ku, Osaka-shi, Osaka Prefecture/ Chome Ichiban VZ Name (105) Kubota Tekko Co., Ltd. 4 Agent J- Letter Column 7 of "Detailed Description of the Invention" Contents of Amendment (1) Percentage The scope of the claims will be corrected as shown in the attached sheet. (2) Correct “flue valve (5) fully closed” on page 8, line 18 of the specification to “flue valve (5) fully open” 〇(3)
Change “Close in that order” on page 8, line 18 of the specification to “
Open them in that order. ” is corrected. (4) Correct “rai duct valve β)” on page 9, line 15, page 11, line 17, and page 2, lines 5 to 6 of the specification to “flue valve (5)” . & Revised list of attached documents and scope of patent claims! jL%At+lo 1 Claim Eight or more hot air furnaces (H8) to (H4) are operated by sequentially switching between a combustion state for heat storage and a hot air supply state, and other than when the switching is performed, multiple hot air stove (Ha3, (
Ha) in a hot air supply state, and another hot air stove (ML)
, (a hot air supply method in which the exhaust pressure valve (4) of the hot air furnace (HD) to be switched is opened during switching from the hot air supply state to the combustion state at the time of switching, wherein the hot air supply When switching from the state to the combustion state, when the pressure inside the furnace falls below the set value due to the opening of the exhaust pressure valve (4), the combustion-related flue valve (5) is opened while the exhaust pressure valve (4) remains open. , Combustion-related valves +51 , +
A hot air supply method characterized in that the exhaust pressure valve (4) is closed until the last one of 3), 12), and 11) finishes opening.

Claims (1)

[Scope of Claims] Eight or more hot air stoves (Hl) to (Hs)t, which are selectively switched between a combustion state and a hot air supply state for heat storage, and ν other than when switching, Multiple hot air stoves (El), (
H4) to hot air supply form 11, and another hot air stove (Shima)”
(This is a hot air supply method in which the H2 is set to a combustion state, and the exhaust pressure valve (4) of the hot air stove (M) to be changed is opened when the hot air supply state is switched to the combustion state when the first power is being used. In addition to the change of 121 J from the hot air supply state to the combustion state, when the pressure inside the furnace becomes lower than the setting due to the opening of the exhaust pressure valve (4), the exhaust pressure valve (4) is closed with a thin dead weight of 1. Moe w8g
lI! At the same time as the staff's crawl fPet-opens, the combustion-related valve f
11, fil. (!j・fil Hot air supply method using a light chain to close the exhaust pressure valve (4) in the cylinder at 1 when the pipe of Ofi kneading finishes opening.