JPH01189315A - Soot removing device for reforming gas - Google Patents

Abstract

PURPOSE:To effectively remove the soot in a reforming gas only by passing the reforming gas through vacant chambers by sectioning the inner space of a cylindrical housing into plural vacant chambers with partition means and forming clearances connecting neighboring chambers. CONSTITUTION:A gas flowing-in opening 15 and a gas flowing-out opening 16 are formed respectively in the lower part and in the upper part of the cylindrical housing 13 both ends of which are closed. The inner space between the gas flowing-in opening 15 and the gas flowing-out opening 16 in the cylindrical housing 13 is sectioned into plural vacant chambers by partition plates 20, and the clearances connecting neighboring chambers are formed. By this simple structure, the soot in the reforming gas is effectively removed only by flowing the reforming gas through this structure. Consequently, the construction cost is low and the device is allowed to be easily combined with an ordinary atmospheric heat treatment process, and the maintenance for the device is simple because the soot is removed without using a filter element.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an apparatus for removing soot from a metamorphosed gas used in atmospheric heat treatment of steel.

(Prior technology) Shift gas used in the bright heat treatment and carburizing treatment of steel is produced by mixing the raw material with air at a predetermined ratio and pumping it into the shift furnace, where it is heated externally and filled with a nickel catalyst filled in a retort. It is then transformed from the transformation furnace to the processing furnace.

The temperature, C0ff1, and CO2 amount of the atmosphere inside the processing furnace are continuously measured by thermocouples and gas analyzers, and based on the measured values, the flow rate of the metamorphic gas sent to the processing furnace and the neutral gas to be mixed with the metamorphic gas are determined. The flow rate of (N2) is adjusted appropriately, and the composition is automatically adjusted to a modified gas according to the processing purpose.

This metamorphosed gas is N2, Co, Co2, N2, and CH.

Among these, CO is unstable at temperatures, and decomposes to produce soot.

Soot liberated from the metamorphic gas adheres to the oriice, nozzle part, or flow rate control valve of the differential pressure flow meter placed in the pipeline connecting the converting furnace and the processing furnace to measure the flow rate at which the metamorphic gas is generated. In addition to causing deterioration in the control accuracy of gas flow rate, it also adheres to the inner walls of the processing furnace, fans, and objects to be processed, and has an adverse effect on them.

Therefore, conventionally, in order to suppress the generation of soot due to the decomposition of CO in the metamorphic gas, the metamorphic gas has been quickly cooled down by a cooler immediately after metamorphosis.

(Problems to be solved by the invention) However, simply cooling the metamorphic soot does not produce satisfactory results, and there are still problems such as soot adhering to the flow meter and control valves. there were.

SUMMARY OF THE INVENTION In view of these problems, it is an object of the present invention to provide a VC system that can effectively remove soot from metamorphic gas.

Therefore, in order to solve the above problem, the inventors of the present invention solved the problem by placing a Gas inflow passage d
We focused on the fact that a large amount of soot was deposited in the empty space e immediately after the passage, and from this fact we learned that when metamorphosed gas flows from a narrow passage into a wide space, a large amount of soot separates at the boundary. The present invention was devised based on this knowledge.

(Means for solving ILffffi, α) The structure of the present invention in accordance with the above object includes a cylindrical housing in which a gas inlet is formed in the lower part and a gas outlet is formed in the upper part, and both layers are closed by R. The gist of the present invention is to include a partitioning means for partitioning an internal space from a gas inlet to a gas outlet into a plurality of chambers, and to form a circumferential gap that communicates between adjacent chambers.

(Function) According to the above configuration, the metamorphic gas that has flowed into the cylindrical housing from the lower gas inlet passes through each of the chambers partitioned by the partitioning means and flows out from the upper outlet. When the metamorphosed gas flows from a cavity to an adjacent cavity through the gap, the soot in the metamorphosed gas separates and accumulates on the partition means, and when it flows out of the cylindrical housing, most of the soot in the metamorphosed gas is removed. is removed.

(Example) An example of the present invention will be described below based on the drawings. 1st
The figures are a partially cutaway perspective view showing the first embodiment of the present invention, and the second figure is a partially cutaway perspective view showing the first embodiment of the present invention.
The figure is an a** side view of the same, and FIG. 3 is a plan view of the same with the top cover removed.

11 to 3, reference numeral 10 denotes a soot removal device showing an embodiment of the present invention, which has a hollow cylindrical housing 13 whose upper and lower end surfaces are closed by an upper M11 and a lower lid 12. The lower cover 12 is fastened to the housing 13 with bolts 14. A gas inlet hole 15 is provided near the bottom surface of the housing 13, and a gas outlet hole 16 having the same opening area as the gas inlet hole 145 is provided near the top surface. Furthermore, foot portions 17.17 are attached to the outer periphery of the housing 13 so that the housing 13 can be installed vertically. Further, an air vent cock 18 is provided at the bottom of the housing 13.

Inside the housing 13, five circular partition plates 20 having the same diameter are arranged horizontally as partition means, and each circular partition plate 20
are connected by plates 21 at appropriate intervals, and these circular partition plate groups 20 are connected by plates 22 vertically provided on the back surface of the upper lid 11. ) It is hanging inside Uzing 13 and is dusty.

The length of each plate 21 is slightly shorter than the diameter of the circular partition plate 20, and each plate 21 is attached in a different direction. Further, the circular partition plate 20 has a diameter smaller than the inner diameter of the first opening 13, and is disposed so as to be perpendicular to the center line of the first opening 13 and with its center irregularly shifted from the center line of the housing 13. ing.

From the gas inlet 15 to the gas outlet 1 of the housing 13-
6 is divided into a plurality of cavities R by these circular partition plates 20, and adjacent cavities are separated by a gap formed between the inner wall of the housing 13 and the outer peripheral surface of each circular partition plate 20. communicated through. The diameter of the circular partition plate 20 is set so that the area of each gap is approximately the same as the opening area of the gas inflow hole 15. In addition, the circular partition plate 20
By arranging the center of the housing 13 with its center irregularly shifted from the center line of the housing 13, the width of each Ill gap forms a narrowest part and a widest part, and the width between them changes continuously, and the width of the adjacent gap The positions of the parts are shifted relative to each other.

The present embodiment has the above configuration, and its operation will be explained next.

FIG. 4 is a schematic explanatory diagram of an atmosphere adjustment process incorporating the apparatus of this embodiment.

In FIG. 4, reference numeral 30 denotes a conversion furnace, which is equipped with a heat-resistant retort 31. The retort 31 is filled with a catalyst 32 made of a heat-resistant material impregnated with nickel oxide. is heated to a high temperature. Flow type 3
The raw material gas measured by 4 and the air measured by flow rate type 35 are mixed at a predetermined ratio by mixer 36, and after being pressurized by gas mixing pump 37, automatic gas control valve 3
8. Passing through the flashback prevention valve 39, the gas is fed under pressure to the shift furnace 30, and the reaction is promoted by the nickel catalyst 32 in the retort 31 to generate shift gas. The thus generated metamorphosed gas is rapidly cooled by a gas cooler 40 immediately after the metamorphosis in order to suppress the generation of soot due to decomposition of CO.

The cooled metamorphosed gas is then passed through the soot removal device 1 described above.
0 is introduced.

The metamorphosed gas that has flowed into the housing 13 from the gas inlet 15 flows through the gap from the lower cavity divided by the circular partition plate 20 to the upper cavity, and then flows from the gas outlet 16 to the outside of the housing 13. leaks to. The metamorphosed gas that has flowed into the cavity flows into the adjacent cavity through the gap, but the relative positions of the wide parts of the adjacent gaps are shifted from each other.
Further, since the plates 21 are provided in each cavity in different directions, the gas flows out from the gas outlet hole 16 in a spiral flow around each cavity. Then, when passing through the gap and flowing into the empty room, the soot in the modified J&FF soot separates and accumulates on the circular partition plate 20, and a portion falls to the bottom surface 12.

The metamorphic gas flowing out from the gas outlet 16 flows through the flow control valve 41.
, and is introduced into a processing furnace (not shown) through a differential pressure type flow type 42, but the soot removal equipment r! Transmutation by 110
Since most of the soot in the human body has been removed, the flow rate control valve 41
The amount of soot that adheres to the orifice and nozzle of the differential pressure type flow type 42 is extremely small.

The soot separated from the converted gas is cleaned after the pumping of the converted gas is stopped, the upper cover 11 is removed from the housing 13, and the partition plate 20 is taken out and cleaned. After cleaning, when starting the operation again, the air in the housing 13 is discharged by using the air vent cock 18.

In this embodiment, a hollow cylindrical housing 13 and a circular partition plate 20 are illustrated, but the shapes of the cylindrical housing and the partition plate are not limited to these. For example, the cylindrical housing may be replaced with a hollow cone. It is also possible to do this. Furthermore, gaps that communicate adjacent chambers may also be formed directly in the partition plate.

Next, a second embodiment of the present invention will be described. FIG. 5 is a partially cutaway perspective view showing the second embodiment, FIG. 6 is a longitudinal sectional view thereof,
FIG. 7 is a plan view with the top cover removed.

5 to 7, the soot removal device 50 has a hollow cylindrical housing 53 whose upper and lower end surfaces are closed by an upper lid 51 and a funnel-shaped lower lid 52. It is fastened to the housing 53 by. A gas inlet 55 is located near the bottom of the housing 53.
A bus outlet 5G having the same opening area as the gas inlet 55 is provided near the top surface. Further, the outer periphery of the housing 53 has a leg portion 57°5 so that the housing 53 can be installed vertically.
7 is installed. ,′! - more housing 53
An air vent cock 58 is provided at the bottom of the.

A soot discharge port 52a is formed in the center of the funnel-shaped lower lid 52, and a ball valve 59 is screwed into this discharge port 52a.

Inside the housing 53, four funnel bodies 60 are arranged in a stacked manner, and the spout GOa of each funnel body 60 is directed downward 1i52 along the center line of the cylindrical housing 53. The funnel body 60 at the bottom has a spout 60a'' that is longer than the others, and is attached to the lower M52 by a mounting bar 61, and the opening end surface of the spout 60a'' is close to and faces the outlet 52a of the lower lid 52. are doing. Three funnel bodies 60 are stacked in order on the lowest funnel body 60, and appropriate intervals are provided between adjacent funnel bodies 60 by attachment bars 62. The center line of each funnel body 60 is irregularly shifted from the center line of the housing 53. Further, the outer diameter of the opening end surface of the wide mouth portion 60b of each funnel body 60 is set smaller than the inner diameter of the housing 53.

From the gas inlet hole 55 to the gas outlet hole 56 of the housing 53
The internal space leading to the funnel body 60 is divided into a plurality of chambers by each of the funnel bodies 60, and adjacent cavities are separated by a gap formed between the inner wall of the housing 53 and the outer peripheral end surface of the wide mouth portion 60b of each funnel body 60. communicated through. The outer diameter of the end face of the wide opening portion 60b is set so that the area of each gap is approximately the same as the opening area of the gas inflow hole 55. Also, each funnel body 60
By arranging the center of the housing 53 with its center irregularly shifted from the center line of the housing 53, the width of each gap forms a narrowest part and a widest part, and changes continuously between them, and the same width part of the adjacent gap. The position of is relatively shifted.

The present embodiment has the above-described configuration, and the metamorphic gas that has flowed into the housing 53 from the gas inflow hole 55 flows through the gap from the lower cavity partitioned by the funnel body 60 to the upper cavity, and the gas It flows out of the housing 53 from the outflow hole 5G. The metamorphosed gas that has flowed into the cavity flows into the adjacent cavity through the gap, but because the relative positions of the wide parts of the adjacent gaps are shifted from each other, the metamorphosed gas becomes a spiral flow and flows into each cavity. The gas circulates around the vacant room and flows out from the gas outflow hole 56. When passing through the gap, the soot in the metamorphic gas separates, and the separated soot travels inside the funnel body 60 and falls from the spout 60a. Since the spout 60m is along the center line of the housing 53 and is directed toward the lower lid 52, the soot that has fallen from the upper funnel body 60 is in turn poured into the lower funnel body 6.
It passes through the spout 60a of No. 0, falls to the lower MS2, and is deposited on No. 22.

After stopping the pumping of metamorphic soot, the soot deposited on the lower lid 52 can be removed by operating the ball valve 59 to open the discharge port 52m, and the soot can flow along the inside of the funnel-shaped lower lid 52 to the outside of the housing 53. Falling under its own weight. When restarting operation after cleaning, the air vent cock 58 is opened to discharge the air inside.

(Effects of the Invention) According to the present invention, the internal space of the cylindrical housing is divided into a plurality of chambers by a partitioning means, and a gap is formed to communicate the adjacent chambers. Soot in metamorphosed gas can be effectively removed just by passing it through. Therefore, the manufacturing cost is low, it is easy to incorporate into the existing atmospheric heat treatment process, and since soot can be removed without using a filter, maintenance and management of the device is extremely simple.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing a first embodiment of the present invention;
Fig. 2 is a longitudinal sectional view thereof, Fig. 3 is a plan view with the top cover removed, Fig. PlfJ4 is an explanatory diagram of the atmosphere adjustment process incorporating the first embodiment device, and Fig. 5 is the second embodiment of the present invention. A partially broken perspective view showing an example. Figure 6 is a vertical sectional view of the second embodiment, Figure 7 is a plan view of the second embodiment with the top cover removed, and Figure 8 is a cross section of the area type flow rate type showing the state in which soot has accumulated. FIG. 9 is a partial sectional view of the inlet passage of the cooler, also showing the state in which soot is deposited. 13.53... Cylindrical housing, 11.51... Upper lid, 12.52... Lower lid, 52a... Discharge port, 15
．． 55... Gas inlet, 16.56... Gas outlet, 20... Partition plate, 60... Funnel, 60a...
Spout, 60b...wide mouth part, Fig. 1 Planer Fig. 2 Fig. 3 Fig. 5 Fig. 6 Fig. 7 Fig. 8r2 Fig. 9

Claims (5)

[Claims] (1) A cylindrical housing with a gas inlet at the bottom and a gas outlet at the top, closed at both ends, and an internal space from the gas inlet to the gas outlet of the cylindrical housing that is divided into a plurality of empty spaces. What is claimed is: 1. A soot removal device for metamorphic gas, comprising: a partition means for partitioning into two spaces, and a gap communicating between adjacent spaces is formed. (2) The cylindrical housing is a hollow cylinder with both ends closed, the partition means is a disk having a diameter smaller than the inner diameter of the hollow cylinder, and each disk is aligned approximately with the center line of the hollow cylinder. The soot removal device for converted gas according to claim 1, characterized in that the soot removal device is orthogonal to each other. (3) The soot removal device for converted gas according to claim 2, characterized in that the center of the disk is irregularly shifted from the center line of the hollow cylindrical body. (4) The cylindrical housing is provided with a funnel-shaped bottom surface with a soot discharge port formed in the center, and the partitioning means is formed of a plurality of funnels each having an outer diameter of the end surface of the wide-mouthed portion smaller than the inner diameter of the cylindrical housing. Claim 1, characterized in that the spout of each funnel is directed toward the bottom surface along the center line of the cylindrical housing, and the funnels are stacked with appropriate spacing between adjacent funnels. The soot removal device for converted gas according to item 1. (5) The soot removal device for converted gas according to claim 3, wherein the center line of each funnel body is irregularly shifted from the center line of the cylindrical housing.