JPS58180581A - Coal dry distillation gas carrying device - Google Patents

Abstract

PURPOSE:To remove deposits accumulated on an inner wall of a flow path readily without the need of a special means for temperature raising, by the alternate use of inner and outer flow paths of a conduit pipe consisting of a coaxial double pipe. CONSTITUTION:A gas conduit pipe A which carries gas from a coke oven 1 (2 is an ascending pipe; 3 is a bent pipe) to coal dry distillation gas utilizing equipment, is made of a coaxial double pipe consisting of an inner pipe 7 with good thermal conductivity and an outer pipe 8 with good heat insulation. Coal dry distillation gas is passed through the inner pipe 7 of the conduit pipe A, e.g. by opening partitioning valves 12, 12' of a conduit pipe 10 leading to the inner pipe 7 and closing partitioning valves 11 and 11' of a conduit pipe 9 leading to the outer pipe 8. At the same time, gas path formed between the inner pipe 7 and the outer pipe 8 is preheated through an inner wall of the inner pipe 7. When deposits are formed within the inner pipe 7, partioning valves are switched over to allow the dry distillation gas to flow between the inner and outer pipes and at the same time a high temperature inert gas is passed through the inner pipe 7 to effect decoking within the pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to the treatment of 300 to 800°C generated from a coal carbonization furnace.
Coal carbonization gas is conveyed using two lines of conduits alternately, and deposits formed on the inner surface of the conduit conveying the gas can be removed without stopping the conveyance of the gas. This invention relates to a gas transport device. .

A] Coal carbonization furnace, that is, by applying external heating and internal heating to coal, the synthesis of 11t h
;・Identification layer for the purpose of producing Ne1 gas, industrial fuel gas, city gas or coke for one person, 4″!
yφ! Coal drying generated from furnaces of types such as yφ1 layer
N' residue usually contains hydrocarbons such as methane and ethylene, hydrogen, water, tar, crude light oil, ammonia, heat, carbon dioxide, coal powder, etc. , when the temperature is 500'c'1nia, h, some of the hydrocarbons in the gas are excited by the heat hγ and become carbon, and this carbon adheres to the furnace wall and the inner surface of the gas pipe and grows. , and the temperature of the gas is 500 to 300
℃, the tar imitating the gas will actively condense and thermally decompose, and this tar will adhere to the inner surface of the gas pipe and grow rapidly. If this happens, the pressure loss of the gas flowing through the gas conduit will increase7, eventually clogging the inside of the conduit and making it impossible to operate. Therefore, in order to prevent such troubles, in the past, the first step of the coal carbonization furnace was
In addition, if a cyclone is connected to the coal carbonization furnace, a water sprinkling device is installed at the outlet of the cyclone, and the coal carbonization gas is heated to below 100°C by water sprinkling, and the cyclone contained in the gas is This was done to prevent the growth of solid water deposits on the inner surface of the conduit by washing away the suspected C particles that were present in the pipe. That will happen.

On the other hand, in recent years, research has been conducted on methods to recover the sensible heat of coal carbonization gas generated from coal carbonization furnaces and use it for energy conservation.For example, the following methods have been proposed5. Install a built-in fluidized bed or spouted bed, connect this to a coal carbonization furnace with a conduit,
A method of introducing coal carbonization gas into the fluidized bed or spouted bed and supplying boiler water to the heat transfer tube to generate water vapor using the heat retained in the coal carbonization gas.

(2) Install a carbonization tower, connect it to a coal carbonization furnace at 7.11 yen, and convert the coal carbonization gas into Ai + storage tower 4, - □! A method in which the tar vapor in the gas is condensed by cooling with tar spray, and after separating this liquid tar from the gas, steam is generated by indirect heat exchange with boiler water.

1:(l) A method that combines the above (1) and (2).

(11 gasification furnaces were installed, and this was connected to a coal carbonization furnace.
The coal carbonization gas is introduced into the gasification furnace and oxygen is supplied to partially harden the coal carbonization gas, and - high rust 1 reducing gas containing carbon oxide and hydrogen as main components is supplied. Method 1: (5) Install a coal preheater, connect it to a coal carbonization furnace through a barrel, and use the coal carbonization gas to reduce the coal carbonation gas. A method for reducing the amount of heat consumed by a coal carbonization furnace by introducing a preheater (・) and supplying coal for carbonization to dry and preheat the coal. ■According to a series of methods, the Although heat can be recovered, there is a problem in that the above-mentioned dangerous substances adhere to and accumulate on the inner surface of the gas pipe connecting the coal carbonization furnace and the coal carbonization gas utilization equipment, causing operational problems. 2 In order to solve this problem, high-temperature gas at a temperature of 500 to 700°C with an oxygen concentration adjusted to 5 to IO% is blown into the conduit filled with Ai+ deposits. The deposits are burned while controlling the oxygen concentration and gas temperature so as not to cause local heating, and the deposits are taken out of the system as yc combustion gas along with the unburned matter separated by spalling. All you need to do is caulking 3
゜However, in order to perform such a decoking process, it is necessary to cut off the power to the l/lI' flow of coal carbonized gas in the gas pipe, and the operation of the above-mentioned coal carbonized gas utilization equipment is interrupted. It turns out.

Therefore, two systems of gas pipes were installed, and coal carbonization gas was passed through one of the pipes, and the other system was used as a backup. Continuous operation is possible by switching the flow of gas to the backup pipe and decoking the pipe where deposits have formed. Condition <(
Since the temperature of the conduit is 100 p, the temperature of the conduit must be raised to a predetermined temperature before gas is allowed to flow through it. Therefore, even if it is necessary to switch the gas in an emergency because it takes a lot of time to do this, we can handle this situation.
There is also an arrow, 1.1.1, that consumes a lot of heat to raise the temperature.
Another problem is that a large space is required to install two systems of gas pipes.

From the above-mentioned point of view, the present invention provides a method for switching the gas pipes of the pre-(1iii) system at any time without requiring any special heating means, when gas is caused to flow alternately using two systems of gas pipes. Transportation of carbonized coal gas that can be maintained in a usable condition and remove deposits that have formed on the inner surface of the conduit while conveying coal carbonized gas without stopping the conveyance of carbonized coal gas. 1. A method for conveying coal carbonization gas generated from a coal carbonization furnace, consisting of a double pipe consisting of an inner pipe and an outer pipe, The gas pipe of the coal carbonization furnace is connected to the inner pipe separately and connected to the inner pipe and the outer pipe, and a safety shutoff device is installed at this connection, and the coal is inserted into either the inner pipe or the outer pipe. The gas is conveyed by introducing residual gas, and the other of the inner tube or the outer tube is heated by the conveyed gas, and the gas is always kept in a state where the gas can be conveyed.゜Next, this invention will be explained by way of examples and drawings. Fig. 1 shows a schematic cross-sectional view of an example of the apparatus of this invention. The discharge pipe is an outer pipe, 3 is also a curved pipe, and 4 is a curved pipe.
is a totsuno cover, the bent pipe 3 is provided with short pipes 5, 5' for guiding the carbonized coal gas into the conduit, and the branch part of the short pipes 5, 5' in the bent pipe 3 is provided with the said branch part. The gas conduit A is provided with a liquid seal cutoff device 6, 6' using tin as a liquid for opening and closing. It has a double tube structure consisting of a tube 7 and an outer tube 8 as described above, and the cross-sectional area of the inner tube 7 and the cross-sectional area between the inner tube 7 and the gap of the outer tube 8 are approximately equal. and,
The short tube 5 is connected to the inner tube 7, and the cut short tube 5' is connected to the outer tube 8.

At the end of the clearly marked gas conduit A, as shown in FIG.
However, a conduit 10 leading to another coal carbonization gas utilization device I11 is connected to the shunter inner pipe 7. 1 and 11' are the gate valves 12 and 12' of the conduit 10 which have been cut off; 14 and 14' are inert gas supply pipes for introducing inert gas into the inner pipe 7 or outer pipe 8 when not in use. .

Note that the inner tube 7 is made of a material with good thermal conductivity, and the outer tube 8
is made of a material with good thermal insulation properties.

In a series of configurations, an example is shown in Figs. 1 and 2 in which carbonized coal gas is flowed into the inner pipe 7 of the gas conduit A and the outer pipe 8 is in a state after decoking. has been done. .

The shutoff device 6 leading to the building pipe 7 and the gate valves 12, 12' of the conduit 10 connected to the inner pipe 7 are opened, while the outer pipe 8
A conduit 9 connected to a shutoff device 6' and an outer pipe 8 leading to
By closing the gate valves 11 and 11', the carbonized coal gas generated from the coke oven I is discharged into the gas conduit A through the riser pipe 2, bent pipe 3, and short pipe 5, which are gas discharge pipes. The heat of the gas flowing in the inner pipe 7 is transmitted to the coal carbonization gas utilization device (not shown) through the inner pipe 7 and the pipe 10. The tube body of the outer tube 8 and the inert gas stagnant within the outer tube 8 are heated, and the outer tube 8 is kept in a usable state by cutting and joining with the inner tube 7.

As a result of transporting the carbonized coal gas through the inner pipe 7 in this manner, if deposits accumulate on the inner surface of the inner pipe 7,
1f shut off device 6 and gate valves l 2 and l 2' are closed, while shut off device 6' and gate valve + 1 are closed.
. ! ,9
The coal is transported through a pipe 9 to another coal carbonization gas utilization device 1 (not shown). .

On the other hand, after opening the gate valves 12 and 12' of the inner pipe 7,
91, a decoking gas having an oxygen concentration of 5 to 10% and a temperature of 500 to 700° C. is first pumped into the inner tube 7 from the supply pipe 13, and the deposits on the inner tube 7 are combusted by this gas. In this way, the deposits are burned off and the gas for near coking is produced using coal carbonization gas utilization equipment L:+,! , RAJl, and RI are also used for decoking within this device if necessary.

In this way, the decoked inner pipe 7 is heated for use (as described above with the high-temperature coal carbonization gas released in the spring) and is kept ready for use at any time.
Switching the gas flow between the outer pipe and the outer pipe 8 can be done whenever the need arises. According to this method, two systems of gas pipes can be connected to one shield and the outer pipe. As mentioned above, according to this invention, two systems of gas pipes are used and the gas pipes are installed alternately. When flowing gas, keep the gas pipe in the backup system in a state where it can be switched and used at any time without the need for special heating means,
The removal of deposits formed on the inner surface of pipes during coal carbonization and gas transport can be carried out without stopping gas transport.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing an example of the device of the present invention, and FIG. 2 is a schematic sectional view showing the end of the gas conduit.
In the drawings, 1. Coke oven 2. Rising pipe 3. Bent pipe 4. Tonneau cover 5.5'
...Short pipe 6, 6'...Shutoff device A...Gas pipe 7 -Inner pipe 8/Outer pipe 9, 10...Pipe 11, II'
, 12, 12'...Gate valve] 3, 13', Supply pipe
14, l-1″...Inert gas supply pipe

Claims (1)

[Claims] A conduit for transporting coal carbonization gas generated from a coal carbonization furnace,
It consists of a 2M tube consisting of an inner tube and an outer tube. Said 4? q and the gas discharge pipe of the coal carbonization furnace to 11iJ.
Me is connected separately into an inner pipe and an outer pipe, and a cutoff device is provided at each joint, and coal carbonization gas is introduced into either the inner pipe or the outer pipe, and the He gas is conveyed before this. Coal carbonization gas conveying device 6, characterized in that the other of the inner tube or the outer tube is heated by the gas being conveyed to maintain a state in which gas can be conveyed at all times.