JPH0762133B2 - Method for preventing clogging of odor piping in by-product recovery equipment in coke factory chemical engineering area - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a recovery device for collecting by-products such as tar and light oil generated from a coke oven of a coke factory, that is,
Tar decanters, storage tanks, gas oil recovery facilities, gas oil tanks, tar tanks, and other offensive odor gas containing flammable gas (hereinafter referred to as odor) are directly sucked into the coke oven gas conduit via the odor piping and the flow rate of the odor is controlled. The present invention relates to a method for preventing clogging in a pipe by countercurrently introducing a gas liquid into the odor pipe in a by-product recovery device in a coke factory chemical production area that is controlled to be constant.

[Prior Art] In a coke plant, a condensate containing coal tar, which is generated in a gas cooling process which is the first step in refining a coke oven gas, is collected in a static tank called a tar decanter, where it is referred to as coal tar. It is separated from the gas liquid by standing.

The gas liquid is discharged as a supernatant liquid, most of which is used again for cooling the gas generated in the generation coke oven, and the surplus is sent to a wastewater treatment facility such as an activated sludge treatment facility. On the other hand, coal tar is pumped out from the bottom as a sediment and sent to the tar storage tank.

The related equipment including the tar decanter necessary for the first cooling step of the coke oven gas is
It produces odor containing coke oven gas entrained in the gas liquid, ammonia, hydrogen sulfide, and other malodorous substances dissolved in the gas liquid. Conventionally, as a countermeasure against this odor, it is generally considered to adopt a method of removing the malodorous substance by suction, collection of a malodorous gas, and then a washing method, an activated carbon adsorption method, an oxidizing combustion method, a catalytic oxidation method, etc. However, not only is it accompanied by the emission of nitrogen oxides, but also the construction costs and operating costs are high, and in consideration of secondary and tertiary treatments, enormous investment is required.

As a method of eliminating such inconvenience, a malodorous gas is directly sucked into a coke oven gas treatment series through a pipe connected to a coke oven gas generating pipe in the coke oven gas treatment series (hereinafter referred to as an odorous pipe) to obtain a coke oven gas. A method and a device for mixing the inside have been proposed. (Japanese Examined Sho 54-21201, Actual Sho 60-14747).

By using these methods and devices, it is possible to prevent the odor generated in the coke factory chemical engineering area from leaking out of the system extremely economically, and it is possible to improve the working environment. The odor contains a large amount of aromatic substances such as benzene, toluene, xylene, and naphthalene, as well as high-viscosity tar mist (hereinafter referred to as mists). If these adhere to each other, the inner diameter of the odorous pipe is substantially reduced, and in a severe case, the odorous pipe is blocked, and the odor cannot be sucked.

Therefore, in order to avoid such a situation, for example, measures such as a method of keeping the odor pipe warm by steam to prevent the mist from adhering have been taken. A method has also been used in which suction is interrupted and live steam is blown into the pipe to remove the blockage. However, the former case is economically disadvantageous because it requires equipment costs and must always pass steam. Even the latter method cannot be said to be a satisfactory method in terms of using expensive steam and requiring time and labor. In addition, when steam is passed, the thermally decomposed deposits in the pipe are exposed to a kind of dry distillation state by steam heat and adhere to the inner wall of the pipe, which cannot be easily removed.

[Means for Solving Problems] As a result of various studies in order to solve the above-mentioned inconveniences in the conventional method, the present invention calls it a gas liquid of an appropriate temperature in the gas treatment series in the coke factory chemical engineering area. Since a large amount of collected liquid is collected, if it is supplied to the odor pipe,
The heat of the gas liquid and the fluidity of the liquid make it possible to wash the inner wall of the odor pipe, keep it clean at all times, and prevent the mist from adhering. It is a thing. That is, the gist of the present invention is that the flammable gas-containing malodorous gas (odor) generated in the by-product recovery device installed in the coke factory chemical engineering area is passed through the odor pipe into the coke oven gas treatment series. When performing direct suction processing, a part of the warm gas liquid recovered in the coke oven gas treatment series is made to flow down in the odor pipe in the direction opposite to the odor flow, forming a liquid film in the odor pipe. At the same time, there is a method for preventing clogging of an odor pipe in a by-product recovery device in a coke factory chemical engineering area, which is characterized by keeping the odor pipe inside warm and further efficiently moving mist contained in the odor to a gas liquid.

[Operation] A gas liquid having an appropriate temperature is supplied into the odor pipe, and the gas liquid flows down while wetting the inner wall of the odor pipe, so that the mist is prevented from adhering to the inner wall of the pipe.

Further, since the inside of the odor pipe is kept warm by the liquid film of this warm gas liquid, the adhesion of mists is also prevented by this.
Furthermore, since the warm gas liquid flows down in the direction opposite to the flow of the odor, the contact rate between the warm gas liquid and the odor is high, and the mist contained in the odor efficiently moves to the gas liquid, and The content of mists is reduced.

[Example] The present invention will be described below with reference to the drawings by taking an odor pipe for sucking an odor generated from a tar decanter, which is one of the recovery tanks, as an example.

FIG. 1 is a system diagram showing an odor suction flow from the tar decanter, and FIG. 2 is a detailed view showing a part of FIG. 1 in an enlarged manner. First, the odor suction flow will be described with reference to FIG.

The coke oven gas treatment system includes a coke oven 1,
Ascending pipe 2, gas cooling tower 3, gas exhauster 4, and gas purification facility 9, and gas conduits 10a, 10b, 10c and 1 connecting them.
It consists of 0d. On the other hand, the condensate line system includes the condensing tank 5, the tar decanter 6, the gas liquid tank 7, the pump 8 and the gas liquid conduits 21, 22a, 22b, 23a, 23b, 24 connecting them, and further from the rising part and the horizontal part. The odor pipe 31 is composed of the odor pipe 31, the odor pipes 31a and 32 consisting only of the rising portion, and the cleaning gas liquid flow-down pipe 31b.

The coke oven gas generated from the coke oven 1 is supplied to the rising pipe 2
Through the gas liquid conduits 23a, 23b by the pump 8 to come into contact therewith, the temperature is lowered, and the gas flows along with the gas liquid in the coke oven generation conduit 10a.
Then, it is further cooled here, and is pressure-fed from the gas exhauster 4 to the gas purification facility 9 provided later. The gas liquid is circulating cooling water, which is also known as cheap water, which is sprayed into the ascending pipe 2 under high pressure. The coke oven gas, which was 800 to 1000 ° C. at the time of generation, comes into contact with this gas liquid. And cooled to below 100 ° C, and the gas liquid is heated. On the other hand, the gas liquid flowing through the gas conduit 10a together with the coke oven gas is withdrawn from the conduit 10a before reaching the gas cooling tower 3, and the gas liquid conduit 2
The gas liquid discharged from the gas cooling tower 3 through 1 goes into the tar decanter 6 while flowing into the tar decanter 6 through the gas liquid conduit 22a, the condensing tank 5, and the gas liquid conduit 22b. The tar decanter 6 is sealed except for a safety opening (atmosphere opening portion) for preventing damage, and is substantially shielded from the atmosphere.

The gas liquid that has entered the tar decanter 6 is allowed to stand still, overflows while separating the tar component that is mixed in the gas liquid, enters the gas liquid tank 7 through the gas liquid conduit 23a, and rises again by the pump 8. It is sent to the pipe 2 and used for cooling the generated gas. The surplus gas liquid is sent to the wastewater treatment facility via the gas liquid conduit 24 branched from the gas liquid conduit 23b.

A large amount of odor generated from a by-product recovery device to which the present invention is applied, for example, a tar decanter, is sucked into the gas conduit 10a via a gas collection pipe. A control device as shown is attached. That is, the odor generating space between the surface of the gas liquid collected in the tar decanter 6 and the upper lid of the tar decanter 6 and the gas conduit 10a are connected by the odor pipe 31a and the odor pipe 31 communicating with the gas pipe 10a. It When the negative pressure of the gas exhaust device 4 in the gas conduit 10a of the coke oven generated gas is used to suck the odor in the tar decanter 6 into the gas conduit 10a, the flow rate detector 100 disposed in the middle of the odor pipe 31a. The odor suction flow rate is controlled by the control valve 101, the pressure gauge 102, the flow rate controller 103, and the like.

The connection between the leading end of the odor pipe 31 and the gas conduit 10a is such that the gas liquid that cools the generated coke oven gas flowing through the gas conduit 10a flows directly into the odor pipe 31 as shown in the figure. The leading end of the rising portion of the odor pipe 31 is cut into the upper surface of the gas conduit 10a so that it does not exist.

Further, the connection between the leading end of the odor pipe 31a and the horizontal portion of the odor pipe 31 is also as shown in the figure, and the odor pipe 31 described later is used.
The tip of the rising portion of the odor pipe 31a is cut into the upper surface of the horizontal portion of the odor pipe 31 so that the gas liquid that has washed the mist flowing therein does not directly flow down into the odor pipe 31a. According to the present invention, a part of the gas liquid is introduced into the odor pipe 31 by the equipment arrangement as described above, and a wet wall is formed in the pipe by flowing down in a direction opposite to the flow of the odor gas, and at the same time the inner wall is kept warm. It is characterized in that it is washed to prevent the mist from adhering to it, and that the mist contained in the odorous gas is efficiently transferred to the gas liquid to reduce the content rate of the mist in the odor.

That is, the present invention will be described with reference to FIGS. 1 and 2. The gas liquid separated from the tar component in the tar decanter 6 and stored in the gas liquid tank is fed into the gas liquid conduit.
It is circulated to the rising pipe 2 via 23b for cooling the generated coke gas, and is also introduced to the rising portion of the odor pipe 31. Then, in the former case, the generated coke gas is cooled and cooled, and the gas liquid reaches the gas cooling tower 3 through the gas conduit 10a, and in the latter case, it is additionally flown down to the inner wall of the odor pipe 31 and is entrained in the odor gas. The mist that tends to adhere to the odor pipe 31 is washed away, flows with the mist in the horizontal part of the odor pipe 31, and is collected in the tar decanter 6 through the washing gas liquid downflow pipe 31b. .

Thus, the mist that rises from the tar decanter 6 in the odor pipe 31 along with the odor and tends to adhere to the inside of the pipe is constantly washed off to prevent the mist from adhering to the inner wall of the pipe. In addition, the gas liquid flowing down in the odor pipe 31 forms a liquid film to keep the odor pipe 31 warm and prevent mist from adhering. Further, the odorous gas that has passed through the odorous pipe 31 has a reduced content of mist,
There is almost no possibility that the mist will adhere even at a place where no gas liquid is present (a place where the liquid film is not formed) such as a connection place between the gas conduit 10a and the gas conduit 10a. Due to these, the present invention can prevent clogging of the odor pipe 31.

[Advantages of the Invention] As described above, the present invention allows a part of the warm gas liquid recovered in the coke oven gas treatment series to flow in the odor pipe in the direction opposite to the flow of the odor. A liquid film is formed in the pipe, the odor pipe is kept warm, and the mist contained in the odor is efficiently transferred to the gas liquid, so clogging does not occur in the odor pipe without causing mist adhesion. This has the effect of not causing

Further, since the odor after passing through this odor pipe has a low content of mists, even if it moves to a location where no gas liquid is present, there is almost no risk of causing mist adhesion at that location. Have.

Therefore, unlike the prior art, it is not necessary to provide steam heat insulation equipment or blow live steam in order to prevent clogging of the odor pipe, and the labor and equipment cost can be greatly reduced. Moreover, the fear of odor leakage due to clogging of piping can be eliminated, and its industrial utility value is extremely high.

[Brief description of drawings]

FIG. 1 is a system diagram showing an odor suction flow generated from a tar decanter, and FIG. 2 is a detailed view showing a part of FIG. 1 in an enlarged manner. 1 ... Coke oven, 2 ... Ascending pipe 3 ... Gas cooling tower, 4 ... Gas exhauster 5 ... Condensing tank, 6 ... Tar decanter 7 ... Gas liquid tank, 8 ... Pump 9 ... Gas purification equipment 10a, 10b, 10c, 10d …… Gas conduit 21,22a, 22b, 23a, 23b, 24 …… Gas liquid conduit 31,31a, 32 …… Odor pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nagaharu Fujieda 7 Kanazawa Town, Kakogawa City, Hyogo Prefecture Kansai Thermochemicals Co., Ltd. Kakogawa Factory (56) References -38155 (JP, U)

Claims (2)

[Claims] 1. A odor pipe is used to directly suck a malodorous gas containing a combustible gas generated in a byproduct recovery device installed in a coke factory chemical treatment area into the coke oven gas treatment line through an odor pipe. In addition, a part of the warm gas liquid recovered in the coke oven gas treatment system is made to flow down in the direction opposite to the flow of odors, thereby forming a liquid film in the odor pipes and keeping the odor pipes warm. A method for preventing clogging of an odor pipe in a by-product recovery device in a coke factory chemical conversion area, which is characterized by efficiently moving mist contained in the gas liquid. 2. A method for preventing clogging of an odor pipe in a by-product recovery device in a coke factory chemical conversion area according to claim 1, wherein the by-product recovery device is a tar decanter.