JPS5820928A - Device for recovering energy of blast-furnace gas - Google Patents

Abstract

PURPOSE:To supply a high-temperature blast-furnace gas to a turbine and contrive to increase the amount of the generated power, by providing a heater for a gas cleaner train of the titled device operated by using a furnace top pressure turbine. CONSTITUTION:A secondary venturi scrubber 2VS in the gas cleaner train of the titled device is provided with mist separators 4a, 4b which are composed of two-layer Raschig rings and are placed in planes transversing a gas passage between a venturi pipe 2 located on the axis line of the interior of a main body 1 and a discharge pipe 3. The heater 5 is provided at a part on the downstream side, i.e. the discharge pipe 3 side, of the mist separators 4a, 4b where the cross- sectional area of the passage is large.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for recovering pressure energy derived from a blast furnace and retained in the blast furnace as electricity using a furnace top pressure turbine (hereinafter simply referred to as a turbine).

The blast furnace at Chibakai Steel Works is frequently operated under high pressure (tp), and its furnace capacity is extremely large, reaching the top of the blast furnace. In many cases, the pressure is as high as 1.2 atmospheric pressures, and the amount of pressure reaches as high as 10,000 Nms'/mi island. The pressure energy of this huge blast furnace tJL is generally converted into electricity by installing a turbine.
I am looking forward to energy saving.

A yield 1 of the pressure energy of blast furnace gas in [blast furnace -
The amount of power generated by the turbine is as shown in the following equation.

However, L: Power generation (kwHt) Cp: Blast furnace gas specific heat (kmt/Nm black °C) Q: Blast furnace fJ
IE flow rate (chest ν'Hr) T: Blast furnace Ganu temperature 1! (C) P 凰; Turbine side pressure ('Is/as) P3: Turbine outlet pressure (KI -): Efficiency: insulation index According to this formula] For a given blast furnace tJIEi! In order to maximize the amount of power generated with the quantity Q, it is necessary to minimize the drop in the blast furnace gas pressure due to overloading in the bottle from '14#II to the turbine.

However, the zero pressure drop of the blast furnace gas in the gas purifier array arranged in the blast furnace gas line between the high-tower pins is quite large, and this causes a decrease in the power generation efficiency of the Isato turbine, so improvement is desired. There is.

Various attempts have been made to compensate for the temperature drop due to water washing, which is the cause of the pressure drop, as a countermeasure for this problem, but all of them have problems in practical use.

For example, it is conceivable to insert blast furnace gas into the pipeline between the gas purifier row and the turbine by interposing a casing at great expense and inserting a heater into it, but since blast furnace gas flows at high speed, heat exchange is possible. Since heat exchangers have to be installed over a wide area in the longitudinal direction of the pipeline, there is no realistic nuvene and no increase in the amount of recovered power generation can be expected.

The present invention solves these problems and provides a device that efficiently increases recovered energy.The features of the present invention are as follows: Connect the top pressure turbine to the axillary turbine,
In the apparatus for recovering the pressure energy of Idaka f gas, there is provided a blast furnace gas energy recovery apparatus in which a heater is disposed in the gas purifier row.

That is, the present invention can heat and raise the temperature of the blast furnace gas supplied to the furnace without installing dedicated equipment, and with the lowest gas flow rate among existing equipment, it is possible to clean the gas using pliers, one-way metal rubber, bag filters, and sand filters. This can be done efficiently using equipment.

When the blast furnace gas purifying equipment row is a pentley stopper, a packed centrifugal separator-type stator is arranged inside it, and the blast furnace gas is guided to this through a vast cross-sectional O flow channel. While flowing at a low speed, the mixture is further guided to a heater to efficiently raise the temperature @A.

By supplying high-temperature blast furnace gas to the turbine, it is possible to advantageously increase the amount of power generation. Almost eliminates the amount of heat removed by evaporation from the blast furnace fJIQ) 1
1iJ heat rise 1 efficiency is further increased 't'*.

It is something.

Furthermore, in the present invention, the heating 1lIK heat flow medium may be, for example, steam generated from blast furnace body cooling equipment, high temperature waste water, combustion waste fJR itself from a hot blast furnace installed near the blast furnace, or installed in its discharge pipe. The heat flow medium from a heat exchanger, a large amount of high-temperature wastewater obtained from a granulation manufacturing device, or the heat flow medium from a sensible heat recovery device that is installed on the outlet side of an air pumping device is inexpensive, easy to use, and has a small amount of storage. When using a high-temperature heat flow medium that can be measured in It is extremely advantageous to make effective use of the

Hereinafter, one embodiment of the present invention Ij1 will be described in detail with reference to the drawings.

At jllml, the blast furnace gas energy cycle II of this example
The L device is a blast furnace gas derived from the top of the blast furnace lνO [pressure crab 1.8 to 2.84/sub 2, temperature 100°C, flow rate 260°C.
10,000 to 720,000 Nm”/llr)!
@C-1st Pente crystallizer Nuclaper IVB -2nd Pliers blower stapper 2VIl t-Sequentially' introduction and cleaning gas purifier line and the secondary pliers roarer Nuclaver 2YI to O cleaning blast furnace tnu The turbine 3/'rl? is in a normally closed state from the branch pipe 1D provided on the upstream side via the blast furnace top pressure steady control valve Sv3. a power generating device that supplies K to rotate the turn and operate the linked generator to generate power;
#y 71 for the target? The blast furnace gas that has passed through the water seal valve v-
, and a device that temporarily stores the gas in the gas holder 〇H via the siren-8 and supplies it to various combustion equipment.

The seventh valve 8V1 is used for emergency purposes to control the furnace top pressure in place of the steady state control valve 11V when it is disabled. -OHK communication connection is required.

As shown in detail in Figure 1 (B) of the above-mentioned secondary bench recruitment - Nutapper xvs C, a pen T & Zeng with a volume of 1100 m' 0 penetrates from the upper center of the main body 1 and is positioned on the center line inside the main body 10. -Tube 2 and Pente 1 Lini tube 8
0 Exhaust pipe 3 installed at the top of the main body from the lower end opening side
and 0 0fJL flow path cross section 1i (85s two-layer 0 Tschichring made dog tosenolator -4m, 4 +, this honey nut separator 4m, 4bO downstream side, that is, the flow path cross section of the above-mentioned discharge pipe 3@) Indirect heater 5 installed at (90-)
It consists of a dust water storage valve 1 at the bottom of the main body and a dust water discharge control valve 6 provided at the lower end.

The indirect heater 5 has a large number of metal tubes (inner diameter 2s-1 outer diameter 34mm
(2) 5b has a rectangular shape when viewed from above, and 7 stages are arranged when viewed from the side, and each stage occupies an area of 50 m. The distribution supply header 5 is connected in communication with the peripheral wall of the other side pipe collection discharge header 5b, the distribution supply header 5 is connected in communication with the supply main pipe SC, and the joint collection discharge header Sa is connected in communication with the discharge main pipe 5DK. This is what I did.

In the figure, 6m and 6b are blind plates arranged in the space in the cross section of the channel in which the rectangular heater 5 is arranged.

The supply main pipe jlICFi and a flow rate control valve 5 are interposed,
Goco high-temperature water is supplied by continuous connection to an existing high-temperature water generation source 11fK such as a blast furnace body cooling system. Flow rate adjustment valve 5
・In the exhaust pipe 3, there is a nine-game temperature detector 5g to o,
f Nu temperature detection value i & and preset target temperature value T
・Compare with Shiso011! Accordingly, the high temperature water supply amount is adjusted and controlled by the control @sh that outputs the opening command signal Co.

Now, assemble the primary pliers - Nu I rubber IVI with the blast furnace gas of 600,000 Nus"/Hr% 60 CL 1"e/- and the secondary pliers with the above composition? Horned person-2v
8, the blast furnace ffi properties on the outlet side of the electric heater 4bO were 1.6 h/ex", the amount of 40C associated metal methane was 011/N11l", and the outlet O height of the indirect heater 5 was Ga J” property is 1.68Kr/am”,
l 0℃, large amount O blast furnace with extremely small pressure loss
Heat the nu to the desired temperature, and then turn O-turn 〒l? 9. Can provide stable supply.

As a result, the above-mentioned indirect heating lI5 can be set up in a dangerous manner. Ofj when using rubber O00kWHr
Compared to +, the amount of electricity of the turbine TRTOji is 1400
KWHr.

400 KWI
It becomes 0.

In this example, a metal tube with fins is used as the indirect heater, but the present invention is not limited to this, and it is preferable to use a simple tube without fins or any other suitable shape.

Furthermore, although a filling type was used as the Z Nutoceno meter, this is not limited to this example, and any other appropriate Minutoceno/Archive rater having high mist separation efficiency, such as a centrifugal type Minutoceno mother generator, may be used.

Incidentally, when a bag filter or a sand filter is used, the armature generator can be omitted.

[Brief explanation of the drawing]

FIG. 1 is an overall side explanatory view showing one embodiment of the present invention.
The figure is a detailed side sectional explanatory view of the side wing portion in FIG. 1), and FIG. 3 is a cross-sectional view taken from arrow A--m in FIG. Bv: Blast Furnace D@C: Dust Catcher VB2: 1st Pliers - Nuku 2 Par Vli! ,
：Secondary Pentier Nuclever TRT' ：Turbine 4m, 4b ：Minutosenoya Rater 5：Indirect Heater 2nd Garden U Fig. 3

Claims (1)

[Scope of Claim] A device for connecting a furnace top pressure turbine to a conduit that leads blast furnace gas through a gas purifying device array, and recovering pressure energy possessed by the blast furnace gas by the turbine. , A blast furnace characterized in that a heater is disposed in the above-mentioned EX air conditioner row! Energy recovery device.