CN105026874A - gas cooler - Google Patents

Abstract

Provided is a gas cooler which is reduced in size, is configured so as to prevent discharge gas from leaking to the outside, and enables dust to be consistently brushed off. This gas cooler (1) has: cooling pipes (5) which are arranged within a cooling chamber (3); a dust brush-off member (7) which is provided in a slidable manner on the peripheral surfaces of the cooling pipes; and a reciprocation mechanism (9) which is capable of reciprocating the dust brush-off member in the axial direction of the cooling pipes. The reciprocation mechanism is provided with: a holding member (17) which holds the dust brush-off member so that the dust brush-off member is capable of reciprocating and which extends in the direction intersecting the axial direction of the cooling pipes; an opening (19) which is provided in a side wall (3a) of the cooling chamber and which enables the holding member to extend out of the cooling chamber and reciprocate; a seal mechanism (21) which prevents gas within the cooling chamber from leaking to the outside; a movement body (22) which supports the holding member extending out of the opening and which is capable of reciprocating; and a drive means (24) which reciprocates the movement body.

Description

gas cooler

technical field

The present invention relates to, for example, a gas cooler (exhaust gas cooling device) for cooling the exhaust gas of a facility that manufactures high-concentration silicon steel strips by siliconizing treatment by CVD (chemical vapor deposition). Gas cooler for gas cooling.

Background technique

Exhaust gas from furnace equipment for manufacturing high silicon steel strips contains ferrous chloride (FeCl ₂ , hereinafter referred to as ferric chloride), which has physical properties of boiling point 1024°C and melting point 670°C.

When the exhaust gas is rapidly cooled from the temperature in the furnace to below the melting point, ferric chloride is produced as a fine powder in the exhaust gas. When the exhaust gas is further cooled from this temperature by the gas cooler, ferric chloride (dust) adheres to the heat transfer surface of the gas cooler. Therefore, a dust removal device is required in the gas cooler. If there is no dust removal device, not only the cooling capacity will be reduced, but also the exhaust flow passage will be blocked by ferric chloride attached to the heat transfer surface, and the operation of the furnace cannot continue.

Therefore, gas coolers have been strongly desired to have a mechanism that can easily remove the dust adhering to the cooling tubes constituting the heat transfer surface and prevent the growth of deposits generated by the dust on the cooling tubes. For example, Patent Document 1 proposes a gas cooler having a mechanism for removing dust adhering to cooling pipes.

The gas cooler disclosed in Patent Document 1 discloses a "dust removal mechanism consisting of a dust removal plate having a plurality of insertion holes into which cooling pipes can be slidably inserted or loosely inserted, Each of the above-mentioned insertion holes is inserted or loosely inserted into the plurality of cooling pipes, and a movement mechanism is used to move the dust removal plate relative to the pipe axial direction of the cooling pipes” (see claim 1 of Patent Document 1) .

As a moving mechanism, Patent Document 1 discloses that each of the above-mentioned dust removal plates is connected to the front end of a sliding shaft inserted into the machine through a seal made of a gland packing and an airtight bushing. Sliding sideways, so that each dust removal plate slides along the tube axis of the cooling tube. More specifically, it is described that a driving device (air cylinder device) is used as a moving mechanism, and a plurality of sliding shafts protruding out of the machine are connected by a connecting plate, and a rod of the air cylinder device as a driving device is connected to the connecting plate.

Patent Document 1: Japanese Patent Application Publication No. 5-27049

As disclosed in Patent Document 1, the dust removal plate has a plurality of insertion holes on the entire surface, and a plurality of cooling pipes are loosely penetrated through the insertion holes and reciprocated.

The dust removal plate is arranged in the cooling room through which the gas passes. The drive mechanism for driving the dust removal plate is arranged outside the cooling chamber. Therefore, the drive mechanism needs to insert the drive shaft sealed so that the gas does not leak out into the cooling chamber from the outside of the machine, support the drive shaft and guide the linear motion, so that the dust removal plate is directed along the axial direction of the cooling pipe. reciprocating movement. In other words, in such a device, it is necessary to maintain sealing and perform linear movement.

However, in the structure of Patent Document 1, since the sliding shaft and the driving shaft reciprocate while receiving the load of the dust removal plate and the resistance of the dust, in order to prevent the deflection of the sliding shaft and the driving shaft, it is necessary to improve the above-mentioned shaft and its support. Rigidity of the part. In addition, if the sealing performance of the sliding portion is enhanced in order to enhance the sealing effect, the sliding resistance increases accordingly, and the driving force needs to be further increased.

Therefore, in the drive mechanism for driving the conventional dust removal plate, there is a problem of increasing the size of the entire device in order to realize stable drive.

Therefore, it is desired to develop a gas cooler that can be downsized and that can achieve both hermeticity and stable drive.

In addition, the above-mentioned problems are not limited to the gas cooler installed in the exhaust gas treatment line of the CVD processing equipment for high-silicon steel sheet production. group, and a gas cooler that has a function of removing dust adhering to these tube groups is a common issue.

Contents of the invention

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a gas cooler capable of reducing the size and weight of the dust removal device, preventing the exhaust gas from leaking to the outside, and stably removing the dust adhering to the cooling pipe. dust.

(1) The gas cooler related to the present invention has: a water-cooled tube group, which is arranged in a cooling chamber for gas circulation; a mechanism capable of reciprocating the dust removal member along the axial direction of the cooling pipe,

The above-mentioned reciprocating mechanism has:

a holding member that holds the dust removing member reciprocally movable in the axial direction of the cooling pipe, and protrudes in a direction intersecting the axial direction of the cooling pipe;

an opening, which is provided on a side wall of the cooling chamber, and enables the holding member to protrude from the side of the cooling chamber and reciprocate in the axial direction of the cooling pipe;

A sealing mechanism, which is provided at the opening, prevents the gas in the cooling chamber from leaking to the outside;

a moving body provided outside the cooling chamber, supporting the holding member protruding from the opening, and reciprocating in a direction parallel to the axial direction of the cooling pipe;

A driving mechanism reciprocates the moving body in a direction parallel to the axial direction of the cooling pipe.

(2) In addition, in the device described in the above (1), there is a small chamber on the outer side of the cooling chamber, the small chamber has a peripheral wall that surrounds the opening to form a closed space, and the small chamber is filled with a liquid for maintaining the inside as a closed space. Inert gas above the cooling chamber pressure,

The moving body is installed in the small chamber.

(3) In addition, in the device described in the above (1) or (2), the above-mentioned sealing mechanism includes: a sealing plate provided on the above-mentioned holding member to cover the above-mentioned opening from the inside of the above-mentioned cooling chamber; It always presses the sealing plate toward the opening side.

(4) In addition, in the device described in any one of the above (1) to (3), the moving body is a traveling vehicle having wheels.

(5) In addition, in the device described in any one of (1) to (4) above, the drive mechanism includes a ball screw and a motor that drives the ball screw to rotate, and is configured to rotate the ball screw by , to make the moving body reciprocate.

In the present invention, the reciprocating mechanism for reciprocating the dust removal member in the axial direction of the cooling pipe is configured to include a holding member that holds the dust removal member so as to be reciprocable in the axial direction of the cooling pipe and is configured to move along with the cooling pipe. The axial direction of the pipe protrudes in a direction intersecting; the opening part is provided on the side wall of the cooling chamber, so that the holding member can protrude from the side of the cooling chamber and reciprocate along the axial direction of the cooling pipe; the sealing mechanism Provided at the opening to prevent gas in the cooling chamber from leaking to the outside; a moving body, which is disposed outside the cooling chamber, supports the holding member protruding from the opening, and can move along the axial direction of the cooling pipe. reciprocating in a parallel direction; and a drive mechanism that reciprocates the moving body in a direction parallel to the axial direction of the above-mentioned cooling pipe, so that the overall size of the device can be realized, and the leakage of exhaust gas to the outside can be prevented and stable cooling can be achieved. dust removal.

If stable dust removal can be realized, the allowance ratio (allowance) with respect to the heat transfer area can be reduced including the reduction in efficiency due to the contamination of the heat transfer surface, and the overall size of the cooling device can be reduced.

Description of drawings

FIG. 1 is an explanatory diagram illustrating main parts of a gas cooler according to an embodiment of the present invention.

Detailed ways

A gas cooler 1 according to the present embodiment will be described based on FIG. 1 .

As shown in FIG. 1 , the gas cooler 1 of the present embodiment has: a plurality of cooling pipes 5 arranged side by side in the cooling chamber 3 through which the gas flows; and a reciprocating mechanism 9 that reciprocates the dust removal member 7 along the axial direction of the cooling pipe 5 .

Each configuration will be described in detail below.

<cooling room>

The cooling chamber 3 is a chamber through which exhaust gas flows, and the exhaust gas flows in a direction perpendicular to the cooling pipe 5 (from bottom to top or from top to bottom) as indicated by arrows in FIG. 1 .

The side wall 3a of the cooling chamber 3 has a door structure and can be opened and closed as shown by the arrow in the drawing. By making the side wall 3a openable and closable, maintenance such as replacement of the dust removal member 7 and internal inspection become easy.

<cooling tube>

A plurality of cooling pipes 5 are arranged in parallel in the cooling chamber 3 to form a group of cooling water pipes. The cooling water pipe group is provided with multiple layers. The cooling water flows through the inside of the cooling pipe 5 , and the exhaust gas is cooled by bringing the exhaust gas into contact with the peripheral surface of the cooling pipe 5 .

<Dust removal part>

The dust removal member 7 is slidably provided along the peripheral surface of the cooling pipe 5 .

As shown in FIG. 1, the dust removal member 7 is made of an L-shaped corner section. One surface of the L-shape constituting the dust removing member 7 is provided with a plurality of U-shaped notch portions 7a. The other surface constituting the L-shape is the upper lateral surface 7b. The surface provided with the notch part 7a is a vertical direction, and the upper lateral surface 7b is arrange|positioned horizontally above the surface provided with the notch part 7a. The cooling pipe 5 is inserted into the notch part 7a so that it may abut or approach.

The dust removal member 7 is provided so as to correspond to all of the cooling pipes 5 from the upper layer to the lower layer, and a plurality of them are provided at predetermined intervals along the axial direction of the cooling pipe 5 . The reciprocating movement range of the dust removing member 7 is configured to cover the entire length of the cooling pipe 5 , and can slide along the portion of the cooling pipe 5 where dust adheres.

The shape of the dust removal member 7 is not particularly limited, and may have a semicircular cutout and sandwich the cooling pipe 5 from top to bottom, or may be merely a rod shape.

In addition, in the case of forming the dust removal member 7 using an L-shaped corner bar as shown in FIG. By arranging them so as to be close to each other, dust removal can be performed on the lower surface side of the cooling pipe.

<Reciprocating mechanism>

The reciprocating mechanism 9 is driven to reciprocate the dust removing member 7 in the axial direction of the cooling pipe 5 . The reciprocating mechanism 9 is equipped with: a holding member 17, which holds the dust removal member 7; an opening 19, which is arranged on the side wall of the cooling chamber 3, for inserting the holding member 17; a sealing mechanism 21, which seals the opening 19; a moving body 22, It supports and holds a member 17 capable of reciprocating movement in a direction parallel to the axial direction of the cooling pipe 5 ; and a drive mechanism 24 drives the moving body 22 .

In addition, in the present embodiment, a small chamber 23 having a peripheral wall 23a forming a closed space surrounding the opening 19 is provided on the outer side of the cooling chamber 3, and main components of the reciprocating mechanism 9 are housed in the small chamber 23. . In Fig. 1, only the side of the small chamber 23 close to the cooling chamber 3 is shown, but the small chamber 23 is also arranged on the opposite side of the cooling chamber 3, and the same main structure of the reciprocating mechanism 9 is also accommodated in the small chamber on the opposite side.

Use such as nitrogen etc. to purge (purge; パ ジ す る) small chamber 23, and the small chamber 23 is filled with nitrogen etc. so that the internal pressure of the small chamber 23 is higher than the internal pressure of the cooling chamber 3, thereby more reliably preventing exhaust from The sealing mechanism 21 leaks to the chamber 23 .

Hereinafter, each configuration of the reciprocating mechanism 9 will be described in detail.

"Holding Parts"

The holding member 17 holds the dust removing member 7 reciprocally movable in the axial direction of the cooling pipe 5 , protrudes in a direction perpendicular to the axial direction of the cooling pipe 5 , and protrudes outward from the side wall 3 a of the cooling chamber 3 at its end. .

In addition, the holding member 17 of the present embodiment protrudes in a direction perpendicular to the axial direction of the cooling pipe 5, but it does not have to be perpendicular, as long as it protrudes in a direction intersecting the axial direction of the cooling pipe 5 and its end The side wall 3a of the cooling chamber 3 only needs to protrude.

As shown in FIG. 1 , the holding member 17 is formed of a plate-shaped body having a predetermined width in the axial direction of the cooling pipe 5 , and the axial rigidity of the cooling pipe 5 is improved. Therefore, even when the dust removal member 7 is subjected to stress due to sliding resistance when sliding along the peripheral surface of the cooling pipe 5, it is difficult to bend.

"Mouth"

The opening part 19 is provided in the side wall 3a of the cooling chamber 3, and is formed in the shape of a long hole extending in the axial direction of the cooling pipe 5. As shown in FIG. The opening 19 is set to have a width capable of inserting the holding member 17 , and the length of the opening 19 is set to be approximately the same as the reciprocating range of the holding member 17 .

"Sealing Mechanism"

The sealing mechanism 21 includes a sealing plate 25 attached to the holding member 17 and covering the opening 19 from inside the cooling chamber 3 , and an urging mechanism that always presses the sealing plate 25 toward the opening.

The sealing surface 25a of the sealing plate 25 near the opening 19 side of the cooling chamber 3 is processed by Teflon (registered trademark), thereby reducing the friction with the cooling chamber 3 while having corrosion resistance, and can smoothly move.

On the cooling chamber 3 side near the sealing plate 25 of the holding member 17, a reaction force receiving plate (reaction force receiving plate) 26 is installed with the sealing plate 25 at a predetermined gap, and a reaction force receiving plate 26 is provided as a always-on opening portion on the reaction force plate 26. The 19 side presses the spring device 28 of the biasing mechanism of the sealing plate 25 .

Since the opening 19 is covered from the side of the cooling chamber 3 by the sealing plate 25, and the sealing plate 25 moves together with the holding member 17 in a state of being pressed against the side of the opening 19, the opening 19 is always sealed to prevent exhaust gas from flowing out of the cooling chamber. 3 leaks.

In addition, as described later, since the holding member 17 is supported by the moving body 22 , the load of the dust removing member 7 does not act on the sealing mechanism 21 .

"Mobile"

The moving body 22 is provided in the small chamber 23 outside the cooling chamber 3 , supports the end of the holding member 17 protruding from the opening 19 , and can reciprocate in a direction parallel to the axial direction of the cooling pipe 5 .

The mobile body 22 holds the holding member 17 by placing the holding member 17 thereon, and the load thereof is supported by wheels 29 provided at the lower portion of the mobile body 22 .

In this way, since the moving body 22 supports the holding member 17 to make the moving body reciprocate, the rotation of the ball screw 33 and the threaded sleeve 40 are used to drive the holding member 17 to reciprocate, so the driving torque can be reduced. The entire drive unit can be downsized.

In particular, since the moving body 22 of the present embodiment is constituted by a traveling vehicle having wheels 29 running on rails 27 provided in the small chamber 23 so as to extend in a direction parallel to the axial direction of the cooling pipe 5, Traveling of the mobile body 22 can be performed smoothly, and the reciprocating movement of the dust removing member 7 can be realized with an extremely small driving force.

In addition, the movable body 22 of the present invention is not limited to having wheels, and may have other forms as long as it can smoothly move in a direction parallel to the axial direction of the cooling pipe, for example, it may slide in a rail shape.

"Drive mechanism"

The driving mechanism 24 reciprocates the moving body 22 in a direction parallel to the axial direction of the cooling pipe 5, and includes: a motor 35; a ball screw 33 connected to the rotating shaft 37 of the motor 35 via a coupling 39; and a threaded sleeve. The cylinder 40 is provided on the movable body 22 and is engaged with the ball screw 33 . The motor 35 rotates the ball screw 33 to reciprocate the movable body 22 along the axis of the ball screw 33 .

Furthermore, as shown in FIG. 1 , the motor 35 is provided outside the small chamber 23 , and the shaft portion of the ball screw 33 penetrates from the outside to the inside of the small chamber 23 . In addition, the motor adopts a servo motor, so that the accuracy of movement and program operation can be ensured.

As described above, since the small chamber 23 is purged with nitrogen or the like, it is necessary to seal it so that the nitrogen or the like does not leak from the portion through which the shaft of the ball screw 33 penetrates. Compared with the sealing of the linearly moving shaft portion, the sealing can be easily and reliably performed.

The operation of the gas cooler 1 of the present embodiment configured as described above will be described.

The exhaust gas containing dust circulates in the cooling chamber 3 so as to cross the axial direction of the cooling pipe 5 , and the exhaust gas is cooled by contacting the surface of the cooling pipe 5 .

If the gas cooler 1 is operated, dust will adhere to the surface of the cooling pipe 5, so the driving mechanism 24 is driven, and the reciprocating mechanism 9 is used to reciprocate the dust removal member 7 along the axial direction (horizontal direction) of the cooling pipe 5.

Since each cooling pipe 5 is in contact with or close to the dust removal member 7 , dust adhering to the surface of the cooling pipe 5 is removed by the reciprocating movement of the dust removal member 7 . The removed dust falls to a dust receiver (not shown) below the cooler, and when an appropriate amount of dust is accumulated, it is discharged to the outside.

As described above, according to the present embodiment, the dust removal member 7 is held by the holding member 17, and the holding member 17 is supported by the moving body 22, and the movement unit of the ball screw 33 and the threaded sleeve 40 is used to move the ball screw 33 Since the rotation is converted into the reciprocating motion in the axial direction of the cooling pipe 5 , it can be smoothly performed with a small driving torque, and it has a structure that can realize miniaturization of the driving device.

In addition, the opening 19 provided on the side wall 3a of the cooling chamber 3 is sealed by the sealing mechanism 21, and the opening 19 is surrounded by a small chamber 23 filled with purge gas such as nitrogen gas, so that the exhaust gas does not leak into the air. external.

In this way, the gas cooler of this embodiment can simultaneously drive the dust removal member 7 smoothly and seal the exhaust gas.

Explanation of reference signs:

1...gas cooler; 3...cooling chamber; 3a...side wall; 5...cooling pipe; 7...dust removal part; Surface; 9...reciprocating movement mechanism; 17...holding part; 19...opening; 21...sealing mechanism; 22...moving body; 23...small chamber; 23a...surrounding wall; 24...drive mechanism; 25...sealing plate; 25a...sealing surface; 26...reaction force plate; 27...track; 28...spring device; 29...wheel; 33. ..Ball screw; 35...Motor; 37...Rotation shaft; 39...Coupling; 40...Threaded sleeve.

Claims (5)

1. A gas cooler, characterized in that, have: Water-cooled tube group, which is arranged in the cooling chamber for gas circulation; A dust removal component, which can be reciprocally arranged on the peripheral surface of each cooling tube of the water-cooled tube group; and a reciprocating mechanism, which reciprocates the dust removal component along the axial direction of the cooling pipe, The reciprocating mechanism has: a holding member that holds the dust removing member reciprocally movable in the axial direction of the cooling pipe, and protrudes in a direction intersecting the axial direction of the cooling pipe; an opening, which is provided on a side wall of the cooling chamber, and enables the holding member to protrude from the side of the cooling chamber and reciprocate along the axial direction of the cooling pipe; a sealing mechanism, which is arranged at the opening to prevent the gas in the cooling chamber from leaking to the outside; a moving body provided outside the cooling chamber, supports the holding member protruding from the opening, and is capable of reciprocating movement in a direction parallel to the axial direction of the cooling pipe; and A driving mechanism for reciprocating the moving body in a direction parallel to the axial direction of the cooling pipe. 2. A gas cooler as claimed in claim 1 wherein, There is a small chamber on the outer side of the cooling chamber, the small chamber has a peripheral wall surrounding the opening to form a closed space, and the small chamber is filled with an inert gas for maintaining the inside at a pressure higher than the internal pressure of the cooling chamber, The moving body is arranged in the small chamber. 3. A gas cooler according to claim 1 or 2, characterized in that The sealing mechanism includes: a sealing plate provided on the holding member to cover the opening from inside the cooling chamber; and an urging mechanism that always presses the sealing plate toward the opening. 4. The gas cooler according to any one of claims 1 to 3, characterized in that, The mobile body is a traveling vehicle with wheels. 5. The gas cooler according to any one of claims 1 to 4, characterized in that, The drive mechanism includes a ball screw and a motor that rotates the ball screw, and is configured to reciprocate the moving body by rotating the ball screw.