JPS5952738A - Apparatus for testing high temperature reactivity of coke - Google Patents

Abstract

PURPOSE:To react coke uniformly with an arbitrary heat pattern and atmospheric composition up to the upper limit temp. at which the coke is subjected to solution and loss reaction by providing a heat shelter plate consisting of heat resisting material at an upper part in a furnace core pipe or at an upper end part of the furnace core pipe and by blowing in gas alternately from upper and lower parts of the furnace core pipe. CONSTITUTION:A space for reaction test is a part E surrounded by the furnace core pipe B, a roaster C, the shelter plate D, and a sample coke O is charged in the space. A supplying pipe M of a reaction gas F and a waste gas pipe N which are connected to the both upper and lower ends of the pipe B are provided, the gas F is blown into the space E of the reaction furnace from the upper and lower parts of the furnace core pipe with opening and closing alternately air supplying electromagnetic valves H and air exhausting electromagnetic valves H' at the upper and lower parts, is exhausted to G, and the exhausted gas is analyzed by a CO analyzer J. Temp. measurement and temp. controlling are performed by a thermocouple I, and the latter can be performed arbitrarily at the outer wall or in the furnace. K is gear motor and descends the lower lid held by a cap nut Q together with the roaster during charging the sample into E part and the discharging.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for testing the gas reactivity of coke at high temperatures.

The role of coke in a blast furnace is as an aeration machine, a reduction machine, and a heat source, but according to the blast furnace dismantling investigation conducted from the mid-1960s, it was discovered that the most important function of coke is as a blast furnace aerator. It has been found that coke that is resistant to pulverization and pulverization is suitable for use in blast furnaces.

The pulverization and pulverization of coke in the blast furnace is mainly carried out by 9
In the high-temperature zone of 00 to 1,500 degrees Celsius, the parts that have become brittle due to the reaction with CO are subjected to wear and impact as they descend through the furnace, and the coke that has undergone these histories undergoes mechanical damage in the raceway. It has been found that this is caused by receiving a shock.

Therefore, importance is placed on the reactivity with CO2 at high temperatures and the strength after reaction of coke for blast furnaces.
8 to 49) were developed, but among these, the special public
-161'65, the so-called C8R test method shown in Japanese Unexamined Patent Publication No. 51-46301 is currently the most popular.

In the blast furnace, coke undergoes a solution loss reaction during the reduction process of iron ore, but the temperature range is 900 -
The temperature is 1,500°C, and the Solly-Sidden-Ross reaction becomes particularly active at 1,200 to 1,500°C. moreover,
According to a blast furnace dismantling survey, coke in a blast furnace begins to become finer and its strength decreases in the area beyond the cohesive zone in the lower part of the shaft.

Therefore, when evaluating the high temperature properties of coke, C0
The temperature conditions under which coke reacts with 2 are considered to be the most important, but none of the high-temperature property testing methods developed to date have accurately reflected the conditions under which coke undergoes a solution loss reaction in a blast furnace.

Based on the background of Toh et al., the present inventors investigated the upper limit temperature at which coke undergoes the Tree-John Ross reaction in a blast furnace (~
We have developed a high-temperature reactivity test device that can react uniformly with coke under arbitrary heat patterns and atmospheric compositions at 1500℃). ■ Connected to both the upper and lower ends of the furnace core tube in a testing device that tests the reactivity between coke and gas at high temperatures while heating the sample to a high temperature and blowing in gas of a desired composition. A coke sieve reactivity test apparatus is provided with a gas supply means and a gas discharge means, and gas can be alternately blown into the furnace core tube from above and below.

2. In a test device that conducts a reactivity test between coke and gas at high temperature while charging a sample into a heat-resistant furnace core tube installed in a heating furnace and heating it to a high temperature, and blowing gas of an arbitrary composition, A gas supply means and a gas discharge means connected to both the upper and lower ends of the furnace core tube are provided, and a heat shielding plate made of a heat-resistant material is provided at the upper end of the inner part of the furnace core tube or at the upper end of the a' core forerunner. Equipment for high-temperature reactivity testing of coke.

The detailed contents of the present invention will be explained below.

FIG. 1 shows an example of the apparatus of the present invention. A is a heater provided in the heating furnace P, B is a refractory core tube also provided in the heating furnace, and C is a rosdol made of a refractory perforated plate and a cylindrical tube. D is a heat-resistant heat shielding plate. The reaction test space is a part E surrounded by a furnace core tube B10 and a stalk C1, and a sample coke O is charged into this space. A supply pipe M for reactant gas F and an exhaust gas pipe N are provided to connect to both the upper and lower ends of the furnace core tube B, and the upper and lower solenoid valves H for supplying air into the reactor E and the solenoid valves for exhausting ■I' are alternately connected. While opening and closing, reactant gas F is blown in alternately from the top and bottom of the furnace core tube and discharged to G, and the exhaust gas is analyzed with a CO analyzer in J.

Temperature measurement and temperature control are performed using a thermocouple I, and temperature control can be performed arbitrarily on the outer wall or inside the furnace. K is a gear mode that lowers the lower lid held by Q during loading and unloading of the sample into section E.

L is a furnace core tube made of heat-resistant material to prevent the sample powdered by reaction at the gas supply and exhaust holes in the lower part of the furnace from entering the exhaust solenoid valve H' and the exhaust gas pipe G. It consists of a lid provided at the upper part of the lower end, and has a structure such that gas can be supplied and discharged through a horizontal hole drilled in the side surface of the lid. In Fig. 1, a single pipe is installed at the upper and lower ends of the furnace core tube to serve as air supply and exhaust, and this nob branches into the air supply and exhaust pipes, each with a solenoid valve. Although we have shown an example in which air supply and exhaust can be performed alternately, it is also possible to provide the air supply pipe and the exhaust/main pipe completely separate until they are connected to the upper and lower ends of the furnace core tube. Add effect. In the reaction between coke and C02, the reaction rate of lump coke increases as the temperature increases in a packed reaction vessel, so the conventional P1 method in which the reaction gas is supplied only from one direction causes non-uniformity in the reaction rate. Therefore, in the present invention, in order to compensate for these drawbacks, the rabbit 11
As explained in Sections 1 and 2, a gas supply means and a discharge means connected to both the upper and lower ends of the furnace core tube were provided, respectively, so that gas could be alternately blown from the upper and lower ends of the furnace core tube at regular intervals. .

Figure 2 shows an example of the results of investigating the relationship between reaction temperature and reaction heterogeneity using the method of the present invention and the conventional method (supplying force only from the bottom) (sample: 30% of the coke reaction amount in an actual furnace) showed that. The test method was to charge two sets of sample coke wrapped in fine wire mesh into the reaction space, one above the other, and measure the number of flies before and after the reaction test to determine the solution loss.

From these results, it is clear that the method of the present invention has a clear effect of improving the reaction uniformity.

Next, in a packed reaction vessel, it is very important to make the temperature distribution in the reactor uniform. Although these devices are hardly found in the devices reported so far, in the present invention, as shown in FIG. We devised a way to improve the uniformity of the temperature inside.

FIG. 3 shows an example of the results of measuring the temperature distribution in the reactor E using a thermocouple. In this figure, the conventional method shows a case where no heat shield plate is provided, but the device of the present invention clearly has a higher uniformity of width 1" than the conventional method. In addition, in the conventional gas reactivity test, a gas-reactive abrasive such as carbon or a gas-permeable material is used as the furnace core. However, in the present invention, non-70% is used as the furnace core tube material.
A material that is gas-reactive and non-gas permeable, such as Rareflux (a trade name manufactured by Tokyo Hunkyurori Co., Ltd. with a component of 1 dsic)
By using the system), the reaction gas can be kept constant and the reaction gas can be blown in alternately from above and below, and in combination with the use of a heat shield plate, it is possible to provide an even more excellent testing apparatus.

As described above, the test HIM'' of the present invention is capable of uniformly reacting the filled sample up to 1500°C with a heat pattern and atmosphere composition that approximate the conditions inside the open furnace while maintaining the uniformity of the warm kite. This is a device that separates i-signs.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an example of the apparatus of the present invention, Fig. 2 is a diagram comparing the inventive method with the conventional method regarding reaction uniformity, and Fig. 3 is a diagram showing the uniformity of temperature distribution in the reactor using the present invention method. This is a diagram comparing the conventional method. A...Heater B...Furnace core tube C...Rosdol D...Heat shield plate E...Inside the reactor
F... Reaction gas supply route G... Exhaust route
H... Solenoid valve ■...? A Electrocouple J...
・CO analyzer K...1,000 torr L...Lower gas supply and discharge port Figure 1

Claims (1)

[Claims] 1. A sample is charged into a heat-resistant furnace core tube provided in a heating furnace, and while being heated to a high temperature, a gas of an arbitrary composition is blown into the sample to evaluate the reactivity between coke and gas at high temperature. A test device for testing high-temperature coke, characterized in that it is equipped with a gas supply means and a gas discharge means connected to both the upper and lower ends of the furnace core tube, so that gas can be alternately blown from the upper and lower ends of the furnace core tube. Reactivity test equipment. 2. In a test device that conducts a reactivity test between coke and gas at high temperature while charging a sample into a heat-resistant furnace core tube installed in a heating furnace and heating it to a high temperature, and blowing gas of an arbitrary composition, A coke comprising a gas supply means and a gas discharge means connected to both the upper and lower ends of the furnace core tube, and a heat shielding plate made of a heat reproducing material at the upper part of the inside of the furnace core tube or at the upper end of the furnace core tube. High temperature reactivity test equipment. 3. The coke high-temperature reactivity test equipment according to claims 1 and 2, wherein the furnace core tube is made of a non-gas-reactive and non-gas-permeable material.