KR20010054551A - Apparatus for removing tar from the coal gas - Google Patents

Abstract

PURPOSE: Provided is an apparatus for removing tar, naphthalene, moisture, dust, etc., contained in coal gas generated by thermal decomposition of coal, from a pipe and a metal filter. CONSTITUTION: The apparatus comprises: a first filter(11) to remove the dust, which is connected to an exhaust duct(9) for exhausting the coal gas; a cooler in which an induction pipe(12) is entered, wherein the coal gas flows in the induction pipe(12) from the first filter(11); a cooling water tank(14) mounted in the cooler, which has a coil-shaped gas cooling tube(15a) connected with the end of the induction pipe(12); a lower trap(15) for trapping extraneous matters which is solidified by the gas cooling tube(15a) and for exhausting the solid extraneous matters by changing into liquid phase, which is exposed to the air; a second filter(16) for removing the extraneous matters, which is connected to an exhaust tube(15b); a regulator(17) to control the exhaust pressure of the extraneous matters-removed coal gas; a flowmeter(19) to control the flow of the coal gas passed through a membrane filter(18) and to supply the coal gas to a gas analyzer(20).

Description

Tar removal device of coal gas {APPARATUS FOR REMOVING TAR FROM THE COAL GAS}

The present invention relates to a device for removing solids such as tar or naphthalene in volatile matter generated by coal pyrolysis when analyzing the composition of coal gas generated from coal gasification, and more specifically, coke is used in the steelmaking process using coal. When analyzing the composition of coal gas generated during manufacturing or analyzing the composition of flue gas generated in the molten reduction steelmaking process that uses molten iron directly to produce molten iron, pipes and metals such as pitch, tar, naphthalene, moisture, and rust in analysis gas The present invention relates to a tar removal device of coal gas, which removes solid matter stuck to a filter.

In general, the composition of coal gas generated in steel mills is composed of the components shown in Table 1 below.

H ₂ (%) CO (%) CO ₂ (%) N ₂ (%) CH ₄ (%) H ₂ O (%) Coke oven gas 56.4 8.4 3.1 2.3 One - Corex Gas 25 63.5 63.5 4.5 3.5 1.5

Such coal gas contains many components in addition to the above components, but especially components such as pitch, tar, naphthalene, and moisture are gasified at a high temperature of 300 ° C. or higher, so there is no problem. In the process of collecting and refining a certain amount of sample gas, the gas is stuck inside a low temperature gas pipe or a metal filter to interrupt the flow of gas, and some are mixed into the gas analyzer and fixed to a low temperature part inside the analyzer. By blocking off, continuous component analysis of coal gas was difficult.

Accordingly, there is a cumbersome problem of periodically cleaning the filter and the inside of the gas pipe at intervals of several tens during gas analysis.

On the other hand, the solids stuck in the gas piping were collected and analyzed, and it was found that most of them consisted of tar, which is an aromatic organic compound. Therefore, various methods are known as a related art for removing tar, which is fixed to a pipe or a metal filter at low temperature such as tar during coal gas composition analysis.

That is, as a conventional tar removal apparatus, as shown in FIG. 1 (a), a gas drying tower containing an induction pipe 101 for inducing coal gas to be analyzed and an organic solvent such as solvent or benzene ( 102) to remove the foreign matter in the coal gas by passing the coal gas blown through the induction pipe 101 through the gas drying tower (102).

However, the conventional tar removal apparatus has a relatively simple configuration and an advantage of completely removing foreign substances, but there is a problem in that accurate gas analysis is difficult because tar is dissolved and reacted with an organic solvent to generate other gases.

In addition, as shown in FIG. 1 (b), another tar removing apparatus winds the induction pipe 105 in the form of a coil in a container 104 containing liquid nitrogen at an extremely low temperature (−180 ° C.), and the induction pipe ( By collecting the foreign matter solidified by passing the analysis gas into the 105 in the collecting tank 106, the removal effect is excellent, but expensive, and the coal gas containing a lot of moisture passes through the cryogenic liquid nitrogen In the process, many cases of freezing and accumulating in the induction pipe 105 to block the passage of coal gas, while the carbon dioxide to be analyzed is changed to a liquid state at minus 78.5 ℃, it is difficult to accurately analyze the coal gas There was this.

Accordingly, the present invention has been made to solve the above problems, the object of which is to analyze the composition of the coal gas generated in the coal gasification process of the steelmaking process so that the gas component can be continuously and accurately analyzed while protecting the analyzer The present invention aims to provide a tar removal device of coal gas, which can easily collect and process the clogging phenomenon of pipes or metal filters generated during the purification of sample gas within a range that does not affect gas analysis or composition change.

Figure 1 (a) (b) is a schematic diagram showing a tar removal device of coal gas according to the prior art,

2 is a block diagram showing a tar removal device of coal gas according to the present invention,

Figure 3 is an installation state showing a tar removal device of coal gas according to the present invention,

Figure 4 is a graph showing the results of the component analysis of coal gas when applying the tar removal apparatus of the present invention.

* Explanation of symbols for the main parts of the drawings *

11 ..... 1st filter 12 ..... Induction pipe

13 ..... Chiller 14 ..... Chilled Water Tank

15 ..... Lower collection tank 15a .... Gas cooling tube

15b .... discharge line 16 ..... secondary filter

17 ..... Regulator 18 ..... Membrane Filter

19 ..... Flow Meter 20 ..... Gas Analyzer

The present invention as a technical configuration for achieving the above object,

In the device for removing tar, moisture and solids other than gas contained in coal gas,

A first filter which removes dust of coal gas introduced in communication with an exhaust duct through which the coal gas is exhausted; and an internal space through which an induction pipe through which coal gas passing through the first filter flows enters is entered Cooler that can be cooled to, the cooling temperature is adjustable; And, the cooling water tank is installed in the cooler is filled with ice in the inner space in which the induction pipe and one end is connected in communication, the gas cooling tube wound in the form of a coil; The solidified foreign matter is collected while passing through the gas cooling tube, the lower collecting tank that exposes the body in the air so that the collected solid foreign matter is discharged to the liquid phase; and, after passing through the gas cooling tube to the discharge pipe A regulator for adjusting the exhaust pressure of coal gas from which foreign substances have been removed while the secondary filter is connected; and after the pressure is adjusted in the regulator, Adjusting the flow rate of a brain through the filter coal gas by flow meters to be supplied to the gas analyzer; all of the tar removal device of the coal gas which is characterized in that it comprises an on maryeonham.

Hereinafter, with reference to the accompanying drawings the present invention will be described in more detail.

Figure 2 is a schematic diagram showing the tar removal device of coal gas according to the present invention, as shown, the device (1) of the present invention is a coal gas to enable a precise analysis when analyzing the composition of coal gas generated in coal gasification It is installed between the exhaust gas duct 9 and the gas analyzer 20 through which coal gas is exhausted so as to remove tar contained therein.

The first filter 11 in communication with the exhaust duct 9 is a filtration member (not shown) for filtering foreign substances having a size of 10 μ or more so that dust and dust of a relatively large size contained in coal gas can be filtered first. Is built therein, the induction pipe 12 is connected between the primary filter 11 and the cooler 13, the coal gas passed through the primary filter 11 is through the induction pipe 12 It enters into the cooler (13).

Here, the primary filter 11 and the induction pipe 12 may be wound around a heat ray that is insulated, insulated, or generates a high temperature so that tar or moisture contained in coal gas can pass in a gaseous state.

In addition, the cooler 13 into which the induction pipe 12 enters the inside may adjust the cooling temperature appropriately while rapidly cooling the internal space P1 to a sub-zero temperature, preferably −30 ° C., and the cooler 13 In the inner space (P1) of the ice-filled cooling water tank 14 is installed, in the inner space (P2) of the cooling water tank 14 to quench the coal gas in the induction pipe 12 to contain the tar and moisture contained therein. One end is connected to the induction pipe 12 entered into the cooler 13 so as to solidify, and the gas cooling is wound around the vertical discharge pipe 15b connected to the lower collecting tank 15 to be described later. The tube 15a is provided and comprised. At this time, the gas cooling tube (15a) is preferably provided with a pipe member of the same material having a good thermal conductivity.

In addition, the lower collecting tank 15 in which the tar and moisture solidified in the cooling water tank 14 are collected while passing through the gas cooling tube 15a is converted into a liquid phase into a liquid phase and discharged to the outside. The body is exposed and has a discharge pipe 15b through which coal and gas from which tar and moisture have been removed are exhausted.

The discharge pipe 15b, through which the coal gas from which tar and water have been removed, is exhausted while passing through the gas cooling tube 15a, is formed of a cyclone filter member (not shown) to filter and remove foreign substances of 5 μm or more. In communication with the secondary filter 16.

Here, at the lower end of the secondary filter 16, since the amount of coal gas used for gas analysis is about 200 cc / min, the amount of coal gas is about 5 l / min to minimize the time taken from coal gas generation to gas analysis. It is preferable to have a bypass flowmeter 16a capable of bypassing the analytical gas.

In addition, a regulator 17 is provided to adjust the exhaust pressure of the coal gas passing through the secondary filter 16, and the fine powder contained in the coal gas whose exhaust pressure is adjusted in the regulator 17 The membrane filter 18 is configured to communicate with the regulator 17 to finally remove foreign substances, and the membrane filter 18 controls the flow rate of coal gas from which tar and foreign substances are completely removed to the gas analyzer 20 side. The flowmeter 19 to supply is provided and comprised.

Referring to the operation and effect of the present invention having the above configuration is as follows.

The apparatus (1) of the present invention is installed in a facility for analyzing gas in a FINEX process for reducing fine ore using gas generated in a molten reduction steelmaking process. First, coal gas generated in a coal gasification process is Since the exhaust duct 9 to be exhausted and the primary filter 11 are in communication with each other, the coal gas passes through the primary filter 11, and dust and dust contained in it 10 μm or more are filtered out.

Subsequently, the coal gas having passed through the primary filter 11 enters the cooler 13 while passing through the induction pipe 12 maintaining the elevated temperature at a constant temperature by a hot wire in a gaseous state. At this time, the induction pipe 12 is provided with a plurality of three-way valve 12a, 12b to purge the nitrogen gas in the reverse direction of the coal gas flow.

On the other hand, the induction pipe 12 to which the coal gas is supplied is connected to the gas cooling tube 15a mounted in the cooling water tank 14 installed in the internal space P1 of the cooler 13, the cooling water tank Since the ice is filled in (14), tar, moisture, and foreign substances contained in coal gas passing through the gas cooling tube 15a rapidly fall to -30 ° C at a high temperature, and a solid state in a gaseous state. The temperature of the internal space P1 of the cooler 13 is automatically sensed by the temperature sensor 13a.

Accordingly, the tar and water and the foreign matter solidified into small grains pass through the gas cooling tube 15a having a diameter of 10 to 20 mm, a turning angle of 15 to 30 °, and a turning diameter of 100 to 300 mm without being caught. It is collected in the lower collecting tank 15 connected to the gas cooling tube 15a.

Here, since the lower collection tank 15 is installed on the lower surface of the cooler 13 so that most of the body is exposed to the atmosphere, the solidified tar, moisture, and foreign matter collected in the lower collection tank 15 are constant. As time goes by, the liquid state changes from a solid state to a liquid state, and tar, moisture, and foreign matter changed into a liquid state are automatically discharged to the outside through the open drain valve 15c.

Then, the clean coal gas from which foreign substances are removed while passing through the gas cooling tube 15a is supplied to the second filter 16 through the discharge pipe 15b connected to the upper end of the lower collection tank 15. Coal gas from which fine powder having a size of 5 μm or more is removed while passing through the second filter 16 is adjusted to an appropriate pressure in the regulator 17, and then finally filtered while passing through the membrane filter 18 again. While removing the fine powder, while the flow meter 19 is adjusted to a constant supply amount is supplied into the gas analyzer 20 is a gas analysis operation is performed. At this time, a three-way valve 16a capable of supplying purge nitrogen in the reverse direction of the gas flow is also installed between the secondary filter 16 and the regulator 17.

In addition, the data on the coal gas analyzed by the gas analyzer 20 is transmitted to the computer 21, the coal gas after the gas analysis is exhausted to the outside through the discharge line (8).

As a result of analyzing the composition of coal gas at about 4 days as described above, clean analysis data can be obtained as shown in FIG. 3, and the solid foreign matter collected in the lower collection tank 15 is perfectly moist as well as tar. In order to improve the accuracy of the gas component data, the gas analysis operation can be stably performed without clogging of the second filter or the melbrane filter even for several days of continuous operation.

According to the present invention as described above, when analyzing the components of the coal gasification process in the steelmaking process, that is, the coke oven gas or the coal-reduced molten reduction steelmaking process, the quenching of the coal gas in the pretreatment of the sample gas contained By completely removing moisture along with the tar, gas analysis can be precisely performed continuously without being affected by tar or other solids.

In addition, by preventing the clogging phenomenon of the first and second filters and membrane filters that filter coal gas before analysis of gas components, it is not necessary to clean them separately as in the prior art, thereby saving work time and protecting the gas analyzer safely. .

In addition, since the temperature of the internal space of the cooler through which the coal gas passes can be properly adjusted to minus 30 ° C, the temperature inside the cooling water tank is arbitrarily adjusted in accordance with the temperature of the incoming coal gas to solidify tar, moisture, and foreign matter, The effect of removing and separating it at all times is achieved.

Claims (4)

In the device for removing tar, moisture and solids other than gas contained in coal gas, A primary filter 11 in communication with an exhaust duct 9 through which the coal gas is exhausted to remove dust of coal gas introduced therein; and induction of coal gas passing through the primary filter 11 The internal space into which the pipe 12 enters can be cooled to sub-zero temperature, and a cooler 13 capable of adjusting the cooling temperature; and one end of the induction pipe 12 in communication with each other, and a coiled gas cooling tube ( 15a) is filled with ice in the inner space is disposed, the cooling water tank 14 is installed in the cooler 13; and the foreign matter solidified while passing through the gas cooling tube 14a is collected, the collected solid foreign matter liquid Lower collection tank 15 which exposes the body to the atmosphere to be discharged to the outside by changing to the outside; and, after passing through the gas cooling tube 15a, passing through the second filter 16 connected to the discharge pipe 15b. Regulates exhaust pressure of coal gas with foreign substances removed And a flow meter (19) for adjusting the flow rate of the coal gas passed through the membrane filter (18) to be supplied to the gas analyzer (20) after being pressure-adjusted by the regulator (17). Tar removal device of coal gas. The method of claim 1, The primary filter 11 and the induction pipe 12 are wound around a heat ray that is insulated, insulated, or generates a high temperature so as to pass through a tar, moisture, or other gaseous state contained in the coal gas. Tar remover. The method of claim 1 The gas cooling tube (15a) is a tar removal device of the coal gas, characterized in that it is provided with a pipe member of the same material having a good thermal conductivity. The method of claim 1 At the lower end of the secondary filter 16, the amount of coal gas used for gas analysis is about 200 cc / min, which is very small, so that the analysis time is about 5 l / min to minimize the time taken from coal gas generation to gas analysis. A tar removal device for coal gas, characterized by comprising a bypass flowmeter (16a) capable of bypassing gas.