JPS5947311A - Treating device of waste gas from converter - Google Patents

Abstract

PURPOSE:To decrease considerably the quantity of the electric power to be used by a fan and to recover the sensible heat of waste gas at the highest possible rate in the stage of conducting the waste gas with the fan to a treating device of a non-combustion type having a dust collector and treating the same by using a dry type dust collector as a dust collector. CONSTITUTION:The waste gas from a converter 1 is conducted by an induced draft fan 50 through a hood 2 and a cooling flue part 3 to a gas cooling boiler 10 where waste heat is recovered in parallel with gas cooling. The cooling water in a tank 32 is then sprayed from a nozzle 31 to the waste gas by a pump 33 of a gas cooler 30 to cool the waste gas. The waste gas is further introduced to a bag filter 20 as a dry type dust collector which captures dust and feeds and discharges the captured dust to a feeder 20a. The waste gas removed of dust is fed to a diffusion tower 7 for combustion and a gas holder 8, etc. The pressure drop of the bag filter is thus decreased and the sensible heat is effectively recovered.

Description

[Detailed description of the invention] Ru.

As is well known, there are two types of converter exhaust gas processing power type Ktri, combustion type and non-combustion type, and non-combustion type (1).

FIG. 1 shows an example of conventional processing equipment using the OG method. That is, I from converter 1: Jl gas company, hood 2
and a primary venturi scrubber 4A and a secondary venturi scrubber 4B as wet dust collectors by an induced fan 5 from the converter exhaust gas inlet side having a cooling flue section 3.
After the gas is introduced into the gas tank, the pressure is increased by a booster blower 6, and the gas is fed to a combustion diffusion tower 7, a gas holder 8, and the like. 1) is a collection valve for supplying gas to the gas holder 8.

However, in this type of OG method fJii,
There are two major problems fundamentally arising from the use of wet dust collectors, particularly venturi scrubbers.

First, the Pentillary scrubber has the highest pressure loss among all types of dust collectors. However, for example, in the case of a 70 ton converter, the induced fan 5 is 01.
4. s o m+IIAq t■2501+lmAq
After boosting the pressure with i (difference: 1700mmAt9-further booster blower 6) ■250 City A (
] to (g) 840 tone Aqt. and,
The air blowing capacity of these blowers 5 and 6 is 87 and 20, respectively.
ONm /Hr-wet,, 7 7,28ONm
/Hr・wet. Furthermore, the power consumption of the blower motor required under these conditions is 650kW.
and 25 O kW were required. Therefore, the total power consumption was 900 kW. This increases the amount of electricity used and is extremely uneconomical.

Second, since each Pencil Scrubber uses water to remove dust, the next Pencil Scrubber person will have to use water to remove dust. l 00~J (l OLl 'C7,:+1
degree θ1, 15 degree exhaust gas (bow, live draft of Iso 5 ()'
At position 4 ()7℃, booster blower at position 0 FJ
84 '(-(') Let's dump soil at +1 degree l. Therefore, if the vertical rotation 'l or 4J1 force is fully effective, the effect will be 1 - 1 l II x low.

The present invention is based on the conventional method: the origin is set at 4' ((length K f+'l
The purpose is to provide a converter gas treatment device that can reduce the power consumption of the RI blower by a large amount and recover the maximum amount of sensible heat from the exhaust gas. .

The present invention will be explained below using a small example as shown in FIG. The same general boiler V as the conventional example is the same No. 11.

] O is the gas cooling j? provided in the cooling flue section 3. In addition to gas cooling, we are also trying to recover heat. Exhaust gas is treated with a gas-cooled AR heater 10.
~('+ (l Cooled at 0°C. There are 20 Begnoinoshiku.

Pagfino 1. In the tar 20 (l is if ';r+r
However, the heat resistance of this "It" cloth is limited to, for example, an instantaneous maximum of 250' C1 and 1 (30] t at all times. Therefore, in order to protect the 21' A cooling water spray nozzle 31 is provided facing the flow path, and a gas cooling device 30 is provided that sprays cooling water from a cooling water tank 32 through a pump 33. 1 Buhipag filter 20 The dust collected is cut out and taken out by the extraction device 20a.

In the exhaust gas treatment equipment configured in this way, compared to the pressure loss of the bag filter and the pressure loss of the bench IJ scrubber (usually about 3000 mmAq),
It is extremely small, about 250-300mlAq. As a result, the booster blower and blower are useless, and the induced blower is small and insufficient.
rill 000+11mAq) at 41. ．． 300
It is only necessary to have the capacity of NmΔ(r・dr3', and for this reason, the power consumption is sufficient at 4-00 kW, compared to the conventional example of 900 kW.
Considering that it was W, the power consumption would be approximately 1%. This actually has more economy than the numbers show.

-Also, the gas is induced, the temperature of the ship is about -1,00℃ at 50 degrees, and the temperature is 4), but then it is cooled with a gas cooling device for the false protection of the cloth. Also, 100. '
Since the degree of ii'iFi is slightly lower than c, compared to cooling it at 84℃ with the nail on the east side, it is possible to recover the sensible heat of the temperature difference between them and make effective use of it. I can try something.

In addition, a dry electrostatic precipitator can also be used as the Inui dust collector according to the present invention. The shunting blower may be provided at the rear stage of the C1 dust blower when using a blower, for example, a drawing blower or a blower. Furthermore, the gas cooling system is
"Internal (C) may be provided.

As described above, since the present invention is equipped with a drying device, it is possible not only to reduce the power of the blower but also to reduce the 1-1
1 profit can be achieved.

[Brief explanation of the drawing]

Figure 1 (d) Overview of conventional example 1 Figure 2 (ri) This is a schematic diagram of the exhaust gas treatment device according to Komei. 1... Converter, 20... Bag filter - 130...
Gas cooling device, 50... induced blower.

Claims (1)

[Claims] (1) A processing device that processes converter J No. 1 gas by guiding it by a blower to a non-combustion type processing device that serves as a dust collector, characterized in that a dry dust collector is used as the dust collector. Converter exhaust gas treatment 5p device.