JPS59222514A - Treating installation for waste gas from converter - Google Patents

Abstract

PURPOSE:To improve the quality of recovered gaseous CO and to reutilize CO2 by forming a sealing structure by CO2 between the mouth and skirt of a converter and providing CO/CO2 separating and extracting devices at the end of a route for recovering gaseous CO. CONSTITUTION:A labyrinth seal 19 is provided between the mouth and skirt 2 of a converter 1, and gas from a line 16 for sealing gaseous CO2 at the mouth of the furnace is supplied to said seal to prevent the intrusion of air. The gas generated in the converter is passed through coolers 3, 4 and is thus cooled. The cooled gas is passed through a primary dust collector 5 and a secondary dust collector 6 and after the gas is removed of dust, the gas is stored in a recovered gas holder 13 through a water sealed check valve 11. A part of the stored gas is utilized as it is as a fuel as in the prior technique but the rest is fed to a CO/CO2 separating and extracting device 14, where the gas is separated. The separated gaseous CO2 is utilized for sealing the mouth of the furnace and the CO is utilized as a raw material for C1 chemistry through a gaseous CO line 18.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a non-combustion type exhaust gas treatment device for a converter.

Conventionally, during operation, the gas ordered for the converter is cooled and dust-collected without being combusted, as shown in Figure 1.

That is, in the figure, 1 is the converter main body, 2 is the skirt, and 3 is the converter body.
, 4 is a cooler for recovered gas (exhaust gas), which cools the recovered gas to, for example, about 1000°C. 5 is a primary dust collector, 6 is a secondary dust collector, and venturi scrubbers are usually used for both. 7 is an induced blower, 8 is a three-way switching valve, and when exhaust gas is not collected, 8a is closed and 8b is open, and when exhaust gas is collected, 8a is open and 8b is closed. Further, 9 is a bypass valve which is opened in an emergency if 8b is not activated by a command to open from close. Closed when hunting.

Reference numeral 10 denotes a combustion diffusion tower that combusts and diffuses exhaust gas at the beginning and end of converter blowing. Reference numeral 11 is a water seal check valve that is opened during gas recovery. Reference numeral 12 is a water seal valve which is water sealed in order to disconnect from the gas recovery holder 13 in an emergency (for example, when the converter is shut down), but is normally open.

In the above configuration, the furnace mouth and skirt part 2 are sealed because it is difficult to mechanically seal them, and the excess air coefficient λ=0.
1, or because air is mixed in the gas generated from the converter, the main component of the recovered gas is (CO + C
O2+N2).

Conventionally, this recovered gas has been recovered and used as fuel gas, but recently, the improvement of the quality of these gases and their reuse as chemical raw materials have become a hot topic. In this case, as mentioned above, the recovered gas contains N2 gas, so CO
It is difficult to extract the fraction, and therefore extraction, separation and dispersion have to be complicated and expensive equipment.

Therefore, the present invention completely seals the furnace mouth with CO2 gas to prevent air from entering the generated gas, that is, to prevent N2 from entering the CO/C
Facilitates the separation and extraction of O2, improves the quality of CO, and
It aims to reuse CO2, and its main points are 1. In a device that recovers CO gas after cooling and collecting dust without burning the gas generated in a converter, a seal structure using CO2 is formed at the mouth and skirt of the converter, and at the end of the CO gas recovery path. Converter exhaust gas treatment equipment characterized by being equipped with a CO/CO2 separation and extraction device.

2. In a device that recovers CO gas after cooling and collecting dust without burning the gas generated in a converter, a seal structure using CO2 is formed at the mouth and skirt of the converter, and at the end of the CO gas recovery path. A converter exhaust gas characterized in that a CO/CO2 separation and extraction device is provided in the converter, and a CO2 supply path is formed from the separation and extraction device to a seal structure at the furnace mouth and/or a purge portion such as a lance. This is processing equipment.

Next, the present invention will be explained in detail based on an embodiment shown in FIGS. 2 and 3 (description of parts in the figures having the same structure as the conventional one will be omitted). As shown in the figure, a CO/CO2 separation and extraction device 14 is placed downstream of the gas recovery holder 13, and
A furnace mouth seal made of CO2 gas is formed between the furnace mouth of the converter furnace body 1 and the skirt 2. An example is shown in FIG. A labyrinth seal 20 is provided at the bottom of the skirt 2 facing the furnace mouth, and a nozzle portion 23 for supplying CO2 gas is provided in this portion. Reference numeral 21 denotes a header pipe communicating with the nozzle section 23. These nozzle sections and the header pipe are provided with a telescopic pipe 22 so that they can follow the rise and fall of the skirt 2, and the CO2 supply pipe 16 is connected to the telescopic pipe 22. connected.

As seen in the above configuration, the present invention purges CO2 to prevent the incorporation of N2, so it is easy to separate CO/CO2, and it is now possible to install the separation and extraction device 14 in the system. be. The generated gas is temporarily stored in the recovered gas holder 13, and part of it is used as a fuel as before, while the other part is sent to the CO/CO2 separation and extraction device 14, where the CO/CO2 is extracted. separated, CO is C
It is used, for example, as a C1 chemical raw material through the O gas line 18.

The CO2 is used again as a gas for sealing the furnace mouth or for purge sealing, for example, the lance insertion port 3' via the line 15.

As described above, the present invention has effects such as improving the quality of CO, increasing its calories, and making it possible to use it as other resources.Furthermore, since the recovered gas is not combusted at all, the exhaust gas treatment equipment In addition, with the present invention, the CO2 recovered by this equipment can be reused as an inert gas medium for sealing and purging, so the equipment and operating costs for this are unnecessary. It has great practical value.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the structure of conventional converter exhaust gas treatment equipment, Fig. 2 is a simplified diagram of the equipment according to the present invention, and Fig. 3 is an explanatory diagram of an embodiment of the seal structure in Fig. 2. . 1: Converter 2: Skirt 3, 4: Cooler 5: Primary dust collector 6: Secondary dust collector 7: Induced fan 8: Three-way valve 9: Bypass valve 10: Stripping tower 1l: Gas recovery valve 12: Water Valve seal 13: Recovery gas holder 14: CO/C
O2 separation and extraction device 15: CO2 gas line 16: Furnace CO2 gas seal line 17: Purge and seal line 18: CO gas line 19: Furnace seal structure 20: Labyrinth seal 21: CO2 gas header pipe 22: Expandable tube.

Claims (1)

[Claims] 1. In an apparatus for cooling the gas generated in a converter without burning it, collecting it as CO gas after collecting dust, a sealing structure using CO2 is formed at the mouth and skirt of the converter, and the CO gas is recovered as CO gas. A converter exhaust gas treatment facility characterized by having a CO/CO2 separation and extraction device installed at the end of a gas recovery path. 2. In a device that recovers CO gas after cooling and collecting dust without burning the gas generated in a converter, a sealing structure using CO2 is formed at the mouth and skirt of the converter, and a seal structure is formed at the end of the CO gas recovery path. Exhaust gas treatment for a converter, characterized in that a CO/CO2 separation and extraction device is provided, and a CO2 supply path is formed from the separation and extraction device to a seal structure at the furnace mouth and/or a purge portion such as a lance. Facility.