CN201292370Y

CN201292370Y - Blast furnace top pressure control rearrange apparatus

Info

Publication number: CN201292370Y
Application number: CNU2008201925527U
Authority: CN
Inventors: 杜凤祥; 王莉; 李蒲生; 王东; 陈磊; 张雁
Original assignee: Wuhan Iron and Steel Group Corp
Current assignee: Wuhan Iron and Steel Group Corp
Priority date: 2008-11-17
Filing date: 2008-11-17
Publication date: 2009-08-19
Anticipated expiration: 2018-11-17

Abstract

The utility model relates to a blast furnace top pressure control and conversion device comprising an air pipe (11) from a blast furnace, a furnace top pressure regulator (1), a low value selector (2), a starter controller (3), a subtraction operational element (4), a control signal distribution device (5) and a coal gas elimination pipe network (12), wherein the control signal distribution device (5) is connected with a first valve (6), a second valve (7) and a third valve (8); and after being connected in parallel, the first valve (6), the second valve (7) and the third valve (8) are led into the coal gas elimination pipe network (12), the low value selector (2) is connected with generating equipment (9), and the generating equipment (9) is connected with the coal gas elimination pipe network (12). The utility model overcomes the disadvantages of complicated structure, and the like of the prior blast furnace top pressure control and conversion device, and has the advantages of simple structure, high service efficiency, and the like.

Description

Blast furnace roof pressure control changeover apparatus

Technical field

The utility model relates to blast furnace gas excess pressure power generating device in the metallurgy industry, and more particularly it is a kind of blast furnace roof pressure control changeover apparatus.

Background technology

In the metallurgy industry blast furnace ironmaking process, produced a large amount of blast furnace gases, have high pressure, pyritous characteristics, be purpose of energy saving, introduced blast furnace gas excess pressure power generating equipment (TRT equipment).

TRT technological principle commonly used as shown in Figure 1, when technical process: TRT does not move, blast furnace gas by the decompression of reducing valve group after, remove gaspipe network, during the TRT operation, reducing valve group complete shut-down, coal gas expand by TRT after the acting generating, remove gaspipe network.It is in parallel with the reducing valve group also to be provided with a bypass quick-opening valve in addition.

Under this process condition, pressure-controlling as shown in Figure 3, pressure-controlling switching controls mode is: when TRT did not move, the blast furnace roof pressure was controlled by the reducing valve group; During the TRT operation, the blast furnace roof pressure is controlled by the TRT system; When moment of TRT disorderly closedown or orderly closedown, TRT cuts valve soon and closes rapidly, and the bypass quick-opening valve is opened rapidly and rushed down pressure, slowly closes then, goes to the control of reducing valve group until pressure-controlling.

1., respectively there is a blind roaster roof pressure force controller TRT and blast furnace aspect there is following problem in roof pressure control switchover mode more than commonly used:, the TRT system need dispose a cover by-pass valve equipment, reducing valve group equipment when the blast furnace aspect need be provided with a cover blast furnace isolated operation, two complete equipment parallel connections.2., the pattern that changes down the pass at the TRT emergency stop by the bypass quick-opening valve soon changes to blast furnace reducing valve group with furnace top pressure control, in switching time long (generally needing about 5 minutes) and the changeover process furnace top pressure fluctuation big, unfavorable to blast furnace production.3. TRT control furnace top pressure is than the low 4kpa of furnace top pressure of reducing valve group control.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned existing disadvantages of background technology part, and a kind of blast furnace roof pressure control changeover apparatus is provided.

The purpose of this utility model reaches by following measure: blast furnace roof pressure control changeover apparatus, it comprises from the blast furnace tracheae, the furnace top pressure setter, low value selector, the start-up control device, subtract arithmetic element, the control signal divider, remove gaspipe network, it is characterized in that the described control signal divider and first valve, second valve, the 3rd valve connects, described first valve, second valve, feed after the 3rd valve parallel connection and remove gaspipe network, described low value selector is connected with generating set, described generating set is connected with removing gaspipe network, and is described from the blast furnace tracheae and first valve, second valve, the 3rd valve is connected with generating set.

In technique scheme, describedly after cutting valve soon, be connected with generating set from the blast furnace tracheae.

1., simplified operating device the utility model blast furnace roof pressure control changeover apparatus has following advantage:, reducing valve group and TRT by-pass valve bypass quick-opening valve unite two into one, and have not had independent bypass quick-opening valve, have reduced facility investment.2., help the safety in production of smelting iron; former control process is: the moment of TRT disorderly closedown; the bypass quick-opening valve is opened certain angle fast according to control signal; slowly close by certain speed then; along with the reducing valve group of slowly closing of bypass quick-opening valve is slowly opened; this process can make the furnace top pressure fluctuation increase, and is generally than the fluctuation under the normal circumstances big 10 to 20kpa, unfavorable to the production of ironmaking.And the control after improving and optimizating is: TRT emergency stop moment, the reducing valve group is directly opened direct control furnace top pressure fast, and furnace top pressure fluctuation and the same when normally controlling helps the safety in production of blast furnace like this.3., the utility model is at blast furnace and the shared operation room of TRT, just TRT returns the occasion of blast furnace centralized and unified management to have bigger advantage.

Description of drawings

Fig. 1 is original blast furnace gas excess pressure power generating equipment (TRT) process structure figure.

Fig. 2 is the TRT process structure figure of the utility model after improving.

Fig. 3 is original blast furnace roof pressure control changeover apparatus structural representation.

Fig. 4 is the utility model blast furnace roof pressure control changeover apparatus structural representation.

1. furnace top pressure setters among the figure (or claiming the roof pressure setter), 2. low value selector, 3. start-up control device, 4. subtract arithmetic element, 5. control signal divider, 6. first valve, 7. second valve, 8. the 3rd valve, 9. generating set (is called for short TRT, be blast furnace gas excess pressure power generating device), 10. cut valve soon, 11. from the blast furnace tracheae, 12. remove gaspipe network, 13. the bypass quick-opening valve, 14. reducing valve groups (forming) by first valve 6, second valve 7, the 3rd valve 8,15. change down the pass functional block soon.

Embodiment

Describe performance of the present utility model in detail below in conjunction with accompanying drawing, but they do not constitute to qualification of the present utility model, only do for example.Simultaneously by illustrating that advantage of the present utility model will become clear more and understanding easily.

Consult accompanying drawing as can be known: the utility model blast furnace roof pressure control changeover apparatus, it comprises from blast furnace tracheae 11, furnace top pressure setter 1, low value selector 2, start-up control device 3, subtract arithmetic element 4, control signal divider 5, remove gaspipe network 12, it is characterized in that the described control signal divider 5 and first valve 6, second valve 7, the 3rd valve 8 connects, described first valve 6, second valve 7, the 3rd valve 8 backs in parallel feed removes gaspipe network 12, described low value selector 2 is connected with generating set 9, described generating set 9 is connected with removing gaspipe network 12, and is described from the blast furnace tracheae and first valve 6, second valve 7, the 3rd valve 8 is connected with generating set 9.Be connected (as shown in Figure 4) by cutting valve 10 backs soon with generating set 9 from blast furnace tracheae 11.

Compared to Figure 1; reducing valve group and bypass quick-opening valve unite two into one in Fig. 2; just cancel original bypass quick-opening valve and replace (as the 1st valve) with one of them valve in the reducing valve group; the reducing valve group is not only when TRT moves; control blast furnace roof pressure when TRT moves, is closed automatically; when the TRT emergency stop, the reducing valve group is opened control roof pressure (as shown in Figure 2) automatically.

Fig. 4 compares main difference with Fig. 3 and is embodied in: cancellation bypass quick-opening valve replaces with a valve in the reducing valve group, but original reducing valve group is only considered its responsiveness of normal control of blast furnace top pressure slow (about about 10 seconds of opening time of total travel), satisfies the requirement of original system to quick-opening valve (total travel opening time be 1 second) so will consider the responsiveness of a valve in the reducing valve group at least.

On the other hand, the improvement based on process system improves accordingly to Controlling System, and as shown in Figure 4: pressure is regulated and controlled roof pressure all the time, and during the TRT operation, the roof pressure regulator output signal exports TRT to, thereby makes TRT control furnace top pressure.And first valve, second valve, the 3rd valve are because the signal that the effect of subtraction functional block receives is always zero; therefore be in closing condition; in case TRT shuts down; with forcing to make the signal that exports TRT to is zero, thereby same because the direct output of the effect roof pressure regulator output signal of subtraction functional block causes reducing valve group control furnace top pressure.When the TRT emergency stop, saved the first process of opening the TRT that slowly closes then soon of bypass quick-opening valve like this.

TRT: the abbreviation of English TOP GAS RECOVERY TURBINE, i.e. blast furnace gas excess pressure power generating device, thus be to utilize blast furnace gas to drive the device that the turbine rotation drives generator for electricity generation.

PIC-A: the furnace top pressure setter of blast furnace aspect, its output direct controlling and driving reducing valve group.

The furnace top pressure setter of PIC-B:TRT aspect, its output is through low value selector control TRT.

Subtract arithmetic element: will deduct the duty setting signal of a constant (being generally 4kpa) back from the furnace top pressure duty setting signal of blast furnace aspect as the furnace top pressure setter of TRT aspect.The set(ting)value of two setters differs 4kpa, mainly is to prevent that TRT and reducing valve group from robbing accent, and the reducing valve group is in the complete shut-down state when guaranteeing the TRT operation.

Low value selector: a plurality of analog signalses that will import compare wherein Schwellenwert output.

The start-up control device: signal rises to maximum gradually by zero in the TRT start-up course, otherwise shuts down then.Moment is zero during emergency stop.

Change down the pass functional block soon: accept emergency stop instruction at once with the output of analog quantity input signal, be reduced to zero with certain speed then, the bypass quick-opening valve changes down the pass function soon when realizing the TRT emergency stop thus.

Control signal divider: will distribute to first valve of reducing valve group, second valve, the 3rd valve according to certain mode from the signal of furnace top pressure setter.

Cut valve soon: during the TRT emergency stop, quick closedown in 1 second.

The utility model blast furnace roof pressure control changeover apparatus is divided into two kinds of situations when implementing:

1, when newly-built blast furnace and TRT, the some valves in the reducing valve group can be designed to quick motion valve (total travel opening time be 1 second), as first valve in the artwork 2.Open requirement soon when shutting down to satisfy TRT.Controlling System designs according to principle shown in Figure 4.

When 2, old TRT transforms overhaul, can be according to Fig. 1, Fig. 2, Fig. 3, transformation reducing valve group shown in Figure 4 and control corresponding system.

Claims

1, blast furnace roof pressure control changeover apparatus, it comprises from blast furnace tracheae (11), furnace top pressure setter (1), low value selector (2), start-up control device (3), subtract arithmetic element (4), control signal divider (5), remove gaspipe network (12), it is characterized in that described control signal divider (5) and first valve (6), second valve (7), the 3rd valve (8) connects, described first valve (6), second valve (7), the 3rd valve (8) back in parallel feeds removes gaspipe network (12), described low value selector (2) is connected with generating set (9), described generating set (9) is connected with removing gaspipe network (12), and is described from blast furnace tracheae and first valve (6), second valve (7), the 3rd valve (8) is connected with generating set (9).

2, blast furnace roof pressure according to claim 1 control changeover apparatus is characterized in that describedly being connected with generating set (9) by cutting valve (10) back soon from blast furnace tracheae (11).