CN101299035A - Iron ore automatic control static state low temperature reduction degradation test device and test method - Google Patents

Abstract

The present invention provides an automatic control static low-temperature reduction pulverization test device of iron ore and a testing method thereof, and belongs to a technical field of the reduction pulverization of iron ore. An integrated multiple-area reduction tube is designed out. The reduction tube is simultaneously placed with a plurality of samples. Furthermore the temperature, the heat transmission and reduction gas flow of each sample area are uniform and consistent in the test process. The reduction pulverization test uses a gas mixture which is composed of three gases of CO, CO2 and N2 and accurately distributes three gases with an automatic gas distributing device. Then the gas mixture is uniformly divided to a plurality of paths after mixing in the gas mixing tank. The plurality of paths are respectively infused to each fan section of the integrated multiple-area reduction tube. The integrated multiple-area reduction tube is heated by a test stove. The temperature of the test stove is controlled by a temperature controller. The integrated multiple-area reduction tube is putted into the test stove for executing reduction pulverization test. The advantage of the invention is that not only the efficiency of test is high, but also the automatic air distribution device and automatic temperature controlling device are advantageous for the accurate control of the test procedure. The metallurgy blast furnace ironmaking operator is provided with in-time and reliable test data.

Description

Iron ore automatic control static low temperature reduction pulverization test device and test method

technical field

The invention belongs to the technical field of iron ore reduction pulverization, and in particular provides an iron ore automatic control static low-temperature reduction pulverization test device and a test method.

Background technique

Iron ore is an indispensable raw material for the iron and steel industry. Blast furnace smelting attaches great importance to the performance and quality of iron ore such as sinter, pellets, and lump ore, especially the low-temperature reduction pulverization performance of iron ore has a great impact on blast furnace smelting. Therefore, before entering the blast furnace, it is necessary to conduct a low-temperature reduction pulverization test on the iron ore to analyze the impact of the iron ore on the blast furnace smelting. With the continuous change of iron ore resources at home and abroad, the blast furnace raw materials of various iron and steel enterprises are also constantly fluctuating, so the task of low-temperature reduction pulverization test of iron ore is increasing day by day. The raw materials were analyzed and tested. In addition, the test time of iron ore low-temperature reduction pulverization test is relatively long, including the process of heating up, constant temperature, reduction and cooling, etc. It takes more than 6 hours. The test of one sample basically takes up one working day, and each sample Multiple parallel tests are required. Therefore, when there are many samples, the test results cannot be released on time, which affects the judgment of blast furnace operation. Therefore, invent a test method and test device for iron ore low-temperature reduction pulverization test that can simultaneously carry out a plurality of samples or a plurality of parallel tests of a sample.

Contents of the invention

The object of the present invention is to provide an iron ore automatic control static low-temperature reduction pulverization test device and test method, which realizes the ability to carry out multiple parallel tests of multiple iron ore samples or one iron ore sample at the same time High-efficiency automatic control of static low-temperature reduction pulverization test. The reducing gas composition, flow rate and temperature during the test were set to automatic control. The test method and test device not only have high efficiency, but also control the test process accurately, and provide timely and reliable test data and operation basis for operators of metallurgical blast furnaces.

The technical scheme adopted by the patent of the present invention to solve its technical problems is: design an integrated multi-zone reduction tube, put multiple samples in the reduction tube at the same time, and ensure that the temperature and heat transfer of each sample area and the reduction gas flow in the test process are required. Uniform and consistent. The mixed gas of CO, CO2 and N2 used in the reduction pulverization test is accurately distributed by the automatic gas distribution device, and then mixed in the gas mixing tank, it is evenly divided into several channels by the flow controller, and respectively passed into one multi-zone Each sector of the reduction tube, the integrated multi-zone reduction tube is heated by a test furnace, and the temperature of the test furnace is controlled by a temperature control device. During the test, samples of the same weight are placed in each area of the reduction tube, and then the integrated multi-zone reduction tube is put into the test furnace for reduction powdering test.

The device of the present invention is composed of an integrated multi-zone reduction tube, an automatic gas distribution device, a test furnace, a temperature control device and the like. The integrated multi-zone reduction tube includes multiple sectors (generally 3 to 10 sectors), heat insulation boards, air inlet pipes, thermocouples, air outlet pipes, fan-shaped perforated plates, fan-shaped damping plates, and covers. To make a double-layer pipe, insert a plurality of insulating plates at equal distances between the outer wall and the inner wall of the double-layer pipe, so that the double-layer pipe is evenly divided into multiple isolated fan-shaped areas, and a fan-shaped perforated plate is placed in each fan-shaped area. A thermocouple is placed in each sector to measure the temperature of each area. In order to make the gas entering the fan-shaped area evenly distributed when it reaches the iron ore sample, a layer of fan-shaped damping plate is placed between the fan-shaped perforated plate and the gas outlet at the front end of the intake pipe, and the reduction pipe is sealed with a cover. The integrated multi-zone reduction pipe is connected with the automatic gas distribution device through the intake pipe. During the test, the reducing gases CO, CO2 and N2 are accurately distributed by the automatic gas distribution device, and then mixed in the mixing tank and evenly divided into several channels by the flow controller, and input into each sector of the integrated multi-zone reduction tube. The integrated multi-zone reduction tube containing the iron ore sample is put into a test furnace with a temperature control device for testing.

Multiple fan-shaped areas of the same size can be made in the integrated multi-zone reduction tube, and each fan-shaped area is assigned an intake pipe, and all the intake tubes are placed in the middle of the integrated multi-zone reduction tube, and an outlet is set on the upper side of each fan-shaped area. trachea.

The front end of the inlet pipe of the integrated multi-zone reduction tube is made into a curved gas outlet, so that it rushes towards the perforated plate. In order to distribute the gas entering the fan-shaped area evenly when it reaches the sample on the perforated plate, the air outlet and the fan-shaped perforated plate Put one deck of fan-shaped damping plate, because the middle velocity of gas flow at the beginning, the fan-shaped damping plate opens edge densely, and the slightly sparse tiny hole in the middle.

The gas flow rate for the test is controlled by an automatic gas distribution device. The automatic gas distribution device will distribute CO, CO2, and N2 in accurate proportions, and input them into the gas mixing tank. The mixed gas will be evenly distributed to the whole body with a flow controller. Each sector of the multi-zone reduction tube. The number of mixed gas split flow paths is equal to the number of sectors of the integrated multi-zone reduction tube and the number of intake tubes (eg 3).

The beneficial effect of the patent of the present invention is: the reduction pulverization test of multiple iron ore samples or multiple parallel reduction pulverization tests of one sample can be carried out at the same time, the test efficiency is high, and the automatic gas distribution and flow controller are used, It is conducive to the accurate control of test process data, and provides timely and reliable detection data for blast furnace ironmaking operators for judgment and analysis of blast furnace operation.

Description of drawings:

The patent of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Figure 1 is a schematic diagram of the overall structure of the test device of the present invention. Among them, the integrated multi-zone reduction tube 1, the gas outlet tube 2, the outer wall of the double-layer tube 3, the inner wall of the double-layer tube 4, the thermocouple 5, the fan-shaped area 6, the iron ore sample 7, the fan-shaped perforated plate 8, the test furnace 9, the fan-shaped Damping plate 10, inlet pipe front outlet 11, temperature control device 12, CO gas 13, CO ₂ 14, N ₂ gas 15, automatic gas distribution device 16, gas mixing tank 17, flow controller 18, mixed gas split flow path 19, Cover 20, air intake pipe 21, heat insulating plate 22, tiny hole 23.

Fig. 2 is a schematic diagram of the integrated multi-zone reduction tube of the present invention.

Fig. 3 is a schematic cross-sectional view of the integrated multi-zone reduction tube of the present invention.

Fig. 4 is a schematic diagram of a fan-shaped perforated plate of the present invention.

Fig. 5 is a schematic diagram of the fan-shaped damping plate of the present invention.

Detailed ways

As shown in Figure 1, in order to carry out the static low-temperature reduction pulverization test of various iron ore samples or multiple parallel tests of one sample at the same time, it is necessary to design a body that can hold multiple samples at the same time without interfering with each other. Multi-zone reduction tube 1 and required auxiliary equipment. The iron ore low-temperature reduction pulverization test uses a mixture of three gases of CO, CO2 and N2 in a certain proportion, so in order to accurately distribute the gas and precisely control the gas flow, an automatic gas distribution device 16 and a flow controller 18 are used. The three kinds of gases 13, 14, 15 enter into the gas mixing tank 1) after accurate gas distribution, and the mixed gas is evenly divided into several paths 19 by the flow controller 18, and respectively passed into the integrated multi-zone reduction pipe 1 through the intake pipe 21 6 per sector. During the test, the integrated multi-zone reduction tube 1 of the iron ore sample 7 was put into the test furnace 9 with a temperature control device 12 to carry out the reduction pulverization test.

As shown in Fig. 2 and Fig. 3, the structure of the integrated multi-zone reducing pipe 1 is to make a double-layer pipe, and insert a plurality of heat insulating plates 22 equidistantly between the outer wall 3 of the double-layer pipe and the inner wall 4 of the double-layer pipe, so that The double-layer pipe is evenly divided into a plurality of isolated fan-shaped areas 6, and a fan-shaped perforated plate 8 is placed in each fan-shaped perforated plate 13, and an iron ore sample 12 is placed on the fan-shaped perforated plate 13. The temperature of sector 6 is measured with thermocouple 5 . Each fan-shaped area 6 is assigned an air inlet pipe 21, and the air inlet pipe 21 is placed in the middle of the integrated multi-zone reduction pipe 1, and an air outlet pipe 2 is arranged on the upper end side of each fan-shaped area 6. The front end of the air inlet pipe 21 is made into a curved shape, so that the air outlet 11 at the front end of the air inlet pipe 21 rushes towards the perforated plate 8 . In order to distribute the gas entering the fan-shaped area 6 evenly when it reaches the perforated plate 8 and the sample 7, a layer of fan-shaped damping plate 10 is placed between the outlet 11 at the front end of the intake pipe and the fan-shaped perforated plate 8 . The integrated multi-zone reduction tube 1 is sealed with a cover 20 .

As shown in Fig. 4, evenly distributed tiny holes 23 are opened on the fan-shaped perforated plate 8, and the reducing gas enters the sample 7 through the perforated plate 8 during the test to reduce it.

As shown in FIG. 5 , the fan-shaped damping plate 10 is provided with tiny holes 23 with dense edges and slightly sparse middle.

Claims (6)

1, a kind of iron ore automatic control static state low temperature reduction degradation test device, comprise one multi-region reduction tube, automated gas divider, trial furnace and attemperating unit, it is characterized in that: one multi-region reduction tube (1) comprises bimetallic tube outer wall (3), bimetallic tube inwall (4), heat-insulating shield (22), draft tube (21), thermopair (5), escape pipe (2), fan-shaped porous plate (8), fan-shaped damping sheet (10) and lid (20), the a plurality of heat-insulating shields of equidistant insertion (22) between bimetallic tube outer wall (3) and bimetallic tube inwall (4), make bimetallic tube evenly be divided into the fan section (6) of a plurality of mutual isolation, put a fan-shaped porous plate (8) in each fan section (6), put the fan-shaped damping sheet of one deck (10) between fan-shaped porous plate (8) and draft tube front end exit (11), one multi-region reduction tube (1) seals with lid (20); One multi-region reduction tube (1) is connected with automated gas divider (12) by draft tube (21), and one multi-region reduction tube (1) is put into the trial furnace (9) that has attemperating unit (12) and tested.

2, device according to claim 1, it is characterized in that: can do a plurality of fan sections (6) in the one multi-region reduction tube (1), a draft tube (21) is distributed in each fan section (6), all draft tube (21) are arranged in the middle of one multi-region reduction tube (1), and each fan section (6) upper side is established an escape pipe (2).

3, test unit according to claim 1 is characterized in that: put iron ore sample (7) above the fan-shaped porous plate (8) in each of one multi-region reduction tube (1), and put a thermopair (5) in each fan section (6).

4, test unit according to claim 1, it is characterized in that: draft tube front end exit (11) is crooked shape, between fan-shaped porous plate (8) and draft tube front end exit (11), put the fan-shaped damping sheet of one deck (10), it is intensive to open the edge on fan-shaped damping sheet (10), middle sparse slightly micro hole (23).

5, test unit according to claim 1 is characterized in that: mixed gas divides stream (19) quantity to equate with fan section (6) quantity and draft tube (21) quantity of one multi-region reduction tube (1).

6, a kind of method that adopts the described test unit of claim 1 to carry out the iron ore automatic control static state low temperature reduction degradation test, it is characterized in that: design an one multi-region reduction tube, in reduction tube, put a plurality of samples simultaneously, and the temperature of each sample area of warranty test process is conducted heat and reducing gas stream is wanted uniformity; Reduction degradation test CO, CO ₂And N ₂The mixed gas of three kinds of gases is with the accurate distribution of automated gas divider, after in the gas mixing tank, mixing then, evenly be divided into several roads by flow controller, feed each fan section of one multi-region reduction tube respectively, one multi-region reduction tube heats with trial furnace, and the temperature of trial furnace is controlled with attemperating unit; Pretend with the sample of weight in each zone of reduction tube during test, then one multi-region reduction tube is put into trial furnace and carry out the reduction degradation test.

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