JPS5813129A - Power plant using collected exhaust pressure - Google Patents

Abstract

PURPOSE:To prevent rise of the pressure at the top of a furnace by furnishing a power plant, working on utilization of the pressure of collected exhaust gas from a blast furnace, with a load limitation citcuit to emit a load limiting signal and a bypass valve dontrol circuit to control the bypass valve in accordance with the load limiting signal. CONSTITUTION:A turbine 3 for drive of the generator 4 is installed on the way of the main pipe 2 leading from a blast furnace 1. A load limitation circuit 6 is furnished in order to emit a load limiting signal a if the load on the generator 4 exceeds a certain specified value. A bypass valve control citcuit 7 controls the bypass valve 5 in accordance with load limiting signals a. Thereby excessive loading on the generator 4 can be prevented. Also the pressure rise at the top of the furnace can be prevented as well as the control system simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION This book 94 uses the pressure gas fluid tS of the blast furnace gas tatami to generate false electricity and to generate power intermittently.

When generating electricity using the blast furnace male ts discharged from the blast furnace, as shown in Fig. pipe 2
A generator 41 was installed between the gas turbine 3 and the wrinkle turbine 3 to generate electricity, but the amount of blast furnace gas generated depends on the operational status of the blast furnace. In some cases, a large amount of electricity is generated, and an excessive load (power generation output) is applied to the generator 4. Therefore, in order to avoid this, the opening m of the speed regulating valve 16f) installed upstream of the turbine 3 is reduced by the load limiter 16 to limit the inflow of blast furnace gas into the turbine 3. The increase in furnace top pressure that occurs due to the smaller opening of the regulating valve 3 is due to the bypass pipe that is connected to the upper fl & ≧ downstream tt of the turbine 3 and has a short length of 1 m. Bypass valve 170SKt and furnace-pressure protector 9 installed in the reactor were avoided by increasing the size of the bypass valve 170SKt.

However, if an excessive load is applied to the generator 4, the process of resolving it will inevitably lead to an increase in the top pressure of the furnace. (Also, the control system becomes extremely complicated, and the control becomes inaccurate and easy to operate.)

The present invention solves the drawbacks of conventional power generation equipment as described above.
lt equipment, etc. (exhaust pressure aI that could be eliminated)
One of the objectives is to provide power generation equipment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An exhaust pressure 1lIIL power generation facility according to the present invention will be described below with reference to figures showing embodiments thereof.

The exhaust pressure 1111L generation equipment according to the present invention (hereinafter referred to as the power generation equipment of the present invention) is as shown in the 11th IK (as shown in the 11th IK). (In the middle of main pipe 2, turbine 3 and wII-bin 3
Since it is equipped with a generator 4 that generates electricity by r
A bypass pipe connects the upstream and downstream of the turbine 3 to the field, and a bypass valve S is interposed in the middle of the pipe. 6 detects the power generation output of the generator 4, and when the enemy power generation output value 1IX11 increases to a predetermined set value such as the rated load value of the generator, the load control signal Ma! When the generated output value decreases to a predetermined set value B (1 (mu)), the output of the load limit signal a is stopped in the load limit 1 path. 7 is the load limit signal at- This is a bypass valve control circuit that manually operates the bypass valve stm while the signal & continues.In addition, the bypass valve control circuit γ
When the load limit signal a is input, the bypass valve 5 is opened a predetermined time, and the load limit 1 is maintained even after a preset predetermined time has elapsed.
If the input of the road turtle continues, the large fist (predetermined 1 I) will be added.
It is sufficient that the IK bypass valve S is opened and the same operation is repeated thereafter. And there is no input of load limit signal 1 (
Then, the bypass valve control circuit 7 operates as the bypass valve stl! !
Jiru. It is detected by the blast furnace top Eu and the furnace top pressure gauge IK. 9 is a pressure signal output from the furnace top pressure gauge 8;
bVt is input, and if the value of the pressure note 1 exceeds the outside pressure value, the bypass valve 2 (-) is a top pressure protector. Yacha 11 is a sludge-type duster with a bench-and-lease collar that can remove dust and control the top pressure of the furnace, and 12 inputs the pressure value 411) output from the top pressure gauge 3. ,
am signal ThK Base II@Note: To operate the dust remover 11, there is a furnace top pressure regulator that adjusts the top pressure. 13 detects 30 revolutions of the turbine! Detection of change of meter, etc.
Reference numeral 11'4 is a speed governor which receives the output aX-rotation speed signal 4# from the rotation detector 13 and controls the speed governor valve 15 provided upstream of the turbine 3.

Next, the operation of the power generation equipment of the present invention will be explained.

Since the amount of blast furnace S □ discharged from blast furnace 1 has increased, the power generation amount of generator 4 increases, and an excessive load is applied to generator 4. When the output of □1 reaches the set value, the load is restricted. The first path detects the sound □ and outputs the load □w to the bypass valve control mu path 7.

The bypass valve control path 7 receives the scissor load control signal aK mold,
Bypass valve %f is opened. As a result, until now /-ni'n3
-811,/(of the blast furnace gas flowing into the Ipass pipe V, the amount of blast furnace gas flowing into the turbine 3 decreases.In this way, the amount of electrical current of the 1 generator 4 becomes excessive, and Human injury is prevented.

The bottom line is that the IF male portion of the far end that was about to flow to the turbine 3' may pass through the bypass t', and the IF male portion of the IF male part that was about to flow to the turbine 3' will be discharged from the blast furnace 1 and pass through the main pipe z to the heating furnace. The total amount of blast furnace gas sent to boilers etc. is not affected. That is, although the furnace top pressure may fluctuate to some extent, it is increased (there is no need to worry) (the bypass valve 5 is controlled as usual by the furnace top pressure protector 9 to AL, which is preferable for low-cost operation).

When the amount of blast furnace gas generated decreases, the load on the generator decreases, and when it drops to the set value ml, the bypass valve s is closed to the bypass valve control path 7, and normal power generation is resumed. continue. It goes without saying that the present invention can also be applied to exhaust pressure diversion power generation from equipment that discharges other types of gas.

As is clear from the above, (1) the power generation equipment of the present invention is capable of reducing the load in the blast furnace by directly controlling the bypass valve when the generator load reaches cKl. There is no need to worry about the top pressure increasing.

The ratio control system is an extremely simple, safe and reliable power generation facility.

[Brief explanation of drawings]

EMBODIMENT OF THE INVENTION Examples of the power generation membrane of the present invention are provided to clarify the present invention, and FIG. 1 is a system diagram of the power generation equipment of the present invention, and FIG. 2 is a system diagram of the conventional power generation equipment. l... Blast furnace 2... Main pipe 2'... Bypass pipe 3... Turbine 4... Departure tl! 5-・
- Bypass valve 6... Load side @ circuit 7... Bypass valve control circuit Patent applicant Sumitomo Metal Industries Co., Ltd. Agent Patent attorney Toshihiko Uchida Figure 2 Figure 1

Claims (1)

[Claims] l High-pressure gas fluid discharged from the equipment discharging the charged gas fluid The exhaust pressure 1llllL power generating equipment KsP%A with a bypass valve interposed in the middle of the
A load limiting circuit that detects t and outputs a load limiter number 1 when the load exceeds a predetermined load value, and a load limiting signal output from the load uniform path, and according to the load limiting signal. and a bypass valve control circuit that controls the bypass valve.