JPS6157368B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an explosion prevention device for an exhaust gas treatment device that processes gas generated from a converter or the like in a non-combustible manner.

Conventionally, such an exhaust gas treatment device recovers heat with a cooler to cool the exhaust gas, removes dust with a wet dust collector, and releases the exhaust gas from a chimney or recovers it as a valuable gas. In addition, as a countermeasure against explosions in exhaust gas treatment equipment, at the beginning and end of blowing based on the start time of blowing, the air stagnant in the exhaust gas treatment equipment is replaced with an inert gas layer to create an explosion-proof laminated layer. formed a structure.

In this way, conventionally, a wet type precipitator without an ignition source was used, so simply replacing the dust with an inert gas through uniform sequence control was sufficient.

However, in order to save energy, electric precipitators with low ventilation resistance are now being used instead of wet type precipitators with high ventilation resistance, and the power consumption of induced blowers is reduced as much as possible. .

Unlike wet precipitators, this electrostatic precipitator is a source of ignition for the exhaust gas, and the risk of explosion cannot be avoided simply by uniformly replacing the gas with inert gas using a conventional timer. Since there is a risk of explosion depending on the composition of the exhaust gas, such measures are necessary.

The present invention has been made in view of these current circumstances. That is, the present invention is based on a high-speed gas sampling device (patent application
53-118891), the composition of the gas is detected and transmitted in 3 to 4 seconds, and the signal is used to alert the cooler and subsequent components before the gas composition reaches the explosive danger zone. The device is characterized in that water is ejected into the device to completely eliminate ignition sources, and inert gas is ejected to dilute the gas while discharging the accumulated gas.

The details will be explained below using examples. In the figure, 1 is a converter furnace, and a cooler 2 is provided above it. A first dust collector 5 is connected to the cooler 2, and a second dust collector 6 is further connected to the cooler 2 through a gas conduit 14. 7 is an induced blower and gas guide line 15
It is connected to a second precipitator 6 by a damper 8 on its discharge side, and the exhaust gas is switched and guided to a chimney 9 and a recovery system 10 by a damper 8. 16 is a gas conduit, and 11 is a high speed gas sampling device attached to the cooler 2. 12 water spout valves, 13
is a valve for blowing out inert gas, and these valves 12 and 13 are operated by a signal from the high speed gas sampling device 11. 17 is a water tank, which is connected to the water jetting valve 12 through piping. 18 is an inert gas pipe, 1
9 is a water pipe, and these pipes 18 and 19 are connected to any part of the exhaust gas treatment device after the cooler 2. Note that 3 is a lance, and 4 is an auxiliary raw material input device.

In this embodiment having the above-described configuration, the gas generated in the converter 1 is attracted by the induced blower 7, and first the heat is recovered and cooled by the cooler 2. After the dust is removed by the dust collector 6, it is released from the chimney 9 or by switching the valve 8 to the recovery system 1.
It is collected after passing through 0.

In this way, the exhaust gas generated in the converter 1 is cooled, dedusted, and treated.
The gas composition changes depending on the reaction state in the converter 1, such as the peak period and the final stage, or the oxygen blown in from the lance 3 and the auxiliary raw material charged from the auxiliary raw material input device 4. This change in gas composition is continuously analyzed by a high-speed gas sampling device 11. In this way, when the analysis value reaches, for example, the O ₂ concentration (5%) and reaches a dangerous situation of explosion, an open signal is immediately input to the water spouting valve 12 and the inert gas spouting valve 13, and the water is turned off. The ignition source is extinguished by the ejection, and at the same time, the CO concentration is lowered (diluted) by the inert gas, and the inside of the exhaust gas device is locally replaced with inert gas. When the gas composition returns to normal and there is no danger of explosion, the signal from the high speed gas sampling device is released and the water jetting valve 12 and the inert gas jetting valve 13 are closed.

As detailed above, according to the present invention, the composition of the gas is continuously analyzed using a high-speed gas sampling device, and when the gas composition reaches a state where there is a danger of explosion, water is spouted into the exhaust gas treatment device. At the same time, we used inert gas to extinguish the ignition source, and at the same time changed the gas composition with an inert gas to make the gas stable against explosions. Even if this method is adopted, it has excellent effects such as being able to quickly and accurately prevent the risk of explosion regardless of any change in gas composition.

[Brief explanation of the drawing]

FIG. 1 is a simplified explanatory diagram showing an embodiment of the present invention. 11...High-speed sampling device, 12...Water jetting valve, 13...Inert gas jetting valve, 17...
water tank.

Claims (1)

[Claims] 1. High-speed gas sampling that detects the composition of the exhaust gas at the inlet of the dust collector of the gas generated from the converter, etc., in an exhaust gas treatment device that cools the gas generated from the converter, etc. in an unburned state, removes dust, and then discharges or collects the gas. 1. An explosion prevention device for a converter non-combustion type exhaust gas treatment device, comprising a water jetting valve and an inert gas jetting valve, which are provided at any location after the cooler and are operated by a signal from the high-speed sampling device.