JP2015027641A - Dust collection installation, heat treatment system and method of operating dust collection installation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust collection installation without possibility of backflow of fine particles in back washing, a heat treatment system and a method of operating the dust collection installation.SOLUTION: A dust collection installation X1 for exhaust gas G1 includes a plurality of filter chambers 11A and 11B connected with an inlet passage 3 and an outlet passage 4, a filter material 12 arranged in the filter chambers 11A and 11B and back washing means for the filter material 12 with a back wash gas A. The individual filter chambers 11A and 11B are connected with inlet passages 3A and 3B and outlet passages 4A and 4B, respectively. Inlet valve means 15A and 15B of opening and closing separately the inlet passages 3A and 3B and outlet valve means 16A and 16B of opening and closing separately the outlet passages 4A and 4B are provided, and pressure release means 17 of releasing the inner pressures of the filter chambers 11A and 11B is also provided. Back washing is carried out, while a dust collection treatment is carried out continuously, by switching the valve means between the opening and the closing state.

Description

  The present invention relates to a dust collection facility, a heat treatment system, and a method for operating a dust collection facility for fine particles contained in exhaust gas. In particular, the present invention relates to a case where exhaust gas is exhausted from a heat treatment apparatus having a sliding portion facing the heat treatment chamber.

  Currently, as a heat treatment apparatus that performs heat treatment such as drying, combustion, thermal decomposition, cooling, etc., there is an apparatus that performs processing while feeding an object to be processed by rotating or partially moving the apparatus, for example, a rotary kiln. There are various devices such as a steam tube dryer (STD). These heat treatment apparatuses are composed of a movable part that is a heat treatment chamber and a fixed part that supports the movable part, and are connected via a sliding part that contacts the movable part and the fixed part. However, the exhaust gas discharged from these heat treatment apparatuses may contain fine particles. Therefore, conventionally, a bag filter device has been widely used as a device for collecting particulates in exhaust gas.

  This bag filter device is mainly composed of a filter chamber into which exhaust gas is sent and a filter material arranged in the filter chamber. The particulates in the exhaust gas sent into the filter chamber are captured by the filter material, and the clean gas is discharged from the filter chamber. Further, since the filter material that has captured the fine particles has a problem such as an increase in filtration resistance, it is periodically cleaned.

  As a cleaning method, there is a method of backwashing the filter material using a backwashing gas such as compressed air. In this backwashing, backwashing gas is blown into the filter chamber from the downstream side of the filter chamber, and fine particles adhering to the filter material are removed by the blown backwashing gas (see, for example, Patent Document 1). . The fine particles are effectively removed particularly when the backwash gas is blown in pulses.

  The bag filter apparatus as described above and the dust collection equipment provided with the back washing means in the bag filter apparatus are still variously improved to improve dust collection efficiency and back washing efficiency. It has been added. In addition, when the fine particles are odorous substances, an improvement in accordance with the characteristics of the fine particles has been sought (for example, see Patent Document 2).

As described above, improvement of dust collection equipment is generally aimed at improving dust collection and backwash performance, etc., and the present inventors also set various problems to improve dust collection equipment. Yes. However, the present inventors have recognized that current dust collection equipment has problems from completely different viewpoints in the course of various improvements, tests, and the like.
In other words, this new problem occurs when the exhaust gas to be processed is discharged from a heat treatment apparatus having a sliding portion facing the heat treatment chamber, such as a rotary kiln or STD.
More specifically, for example, as shown in FIG. 4, when backwashing the dust collection equipment 100, compressed air A is blown into the filter chamber 101 from the downstream side, and the fine particles Z adhering to the filter material 102 are removed. It will be. However, the fine particles Z removed from the filter material 102 are not only accumulated at the bottom of the filter chamber 101 but also heat treated through the flow path 103 for sending the exhaust gas G1 discharged from the heat treatment device 110 to the dust collecting facility 100. It flows backward into the heat treatment chamber 113 of the apparatus 110. The fine particles Z that have flowed back into the heat treatment chamber 113 bite into the sliding portion C facing the heat treatment chamber 113 and wear the sliding portion C itself and the sealing material that seals the sliding portion C. Let

  In this regard, the heat treatment facility 110 includes a rotating part 111 and a fixed part 112. The rotating part 111 is a part that rotates around the axis, and the inner space constitutes the heat treatment chamber 113. On the other hand, the fixing part 112 is a part to which the supply path for the workpiece S or the carrier gas G2 or the flow path 103 for discharging the exhaust gas G1 is connected, and does not rotate. Therefore, a part of the part where the rotating part 111 and the fixed part 112 are in contact with each other faces the inside of the heat treatment chamber 113 due to its structure, and this part corresponds to the sliding part C, and there is a problem of wear. Occurs. This problem is particularly serious when the fine particles Z are hard substances.

  In recent years, for example, the heat treatment apparatus 110 is used to dry a slurry containing metal fine particles, and the dust collection facility 100 is used to recover the metal fine particles from the exhaust gas G1 after drying. is there. In this case, since the metal fine particles are a hard substance, the sliding portion C and the sealing material are worn abruptly. In addition, since the material constituting the sliding portion C and the sealing material becomes fine particles due to wear and is mixed in the metal fine particles, there is a problem that the quality of the obtained metal fine particles (product) is deteriorated.

JP-A-11-264525 JP 2009-66563 A

  The main problem to be solved by the present invention is to provide a dust collection facility, a heat treatment system, and a method for operating the dust collection facility, in which fine particles do not flow back during backwashing.

The present invention for solving this problem is as follows.
[Invention of Claim 1]
A facility for collecting particulates in exhaust gas discharged from a heat treatment apparatus having a sliding portion facing the heat treatment chamber and discharging it as clean gas,
A filter chamber to which the exhaust gas inlet-side flow path and the clean gas outlet-side flow path are connected, a filter material disposed in the filter chamber for collecting particulates, and backwash gas is blown into the filter chamber. And backwashing means for backwashing the filter material,
A plurality of the filter chambers are provided, and the filter chambers are connected to the exhaust gas inlet-side flow path and the clean gas outlet-side flow path, respectively.
Inlet valve means capable of opening and closing the inlet side flow path of the exhaust gas, and outlet side valve means capable of opening and closing the outlet side flow path of the clean gas separately,
Furthermore, a pressure release means capable of releasing the internal pressure of the filter chamber is provided.
Dust collection equipment characterized by that.

[Invention of Claim 2]
The inlet side valve means is provided separately for each of the inlet side flow paths of the exhaust gas,
The outlet valve means is provided for each outlet flow path of the clean gas,
A detecting means for detecting at least one of an open state or a closed state of the inlet valve means and the outlet valve means;
The dust collection facility according to claim 1.

[Invention of Claim 3]
The dust collection facility according to claim 1 or 2, and a heat treatment apparatus comprising a steam tube dryer or a rotary kiln are provided.
A heat treatment system characterized by that.

[Invention of Claim 4]
It is an operation method of equipment for collecting fine particles in exhaust gas discharged from a heat treatment apparatus having a sliding part facing the heat treatment chamber and discharging it as clean gas,
A filter chamber to which the exhaust gas inlet-side flow path and the clean gas outlet-side flow path are connected, a filter material disposed in the filter chamber for collecting particulates, and backwash gas is blown into the filter chamber. And a backwashing means for backwashing the filter material, and a method of operating a dust collection facility comprising:
A plurality of the filter chambers are provided as the dust collection facility, and the filter chambers are connected to the exhaust gas inlet side flow path and the clean gas outlet side flow path, respectively, and are equipped with the filter material. ,
In each of the filter chambers, the exhaust gas inlet-side flow path and the clean gas outlet-side flow path are opened to collect dust, and the exhaust gas inlet-side flow path and the clean gas are collected. After the gas outlet side flow path is closed, the backwashing operation of cleaning the filter material by blowing the backwash gas is performed,
And, in at least one filter chamber among the plurality of filter chambers, the opening and closing states of the inlet-side channel and the outlet-side channel are controlled so that the dust collection operation is performed.
The operation method of the dust collection equipment characterized by this.

[Invention of Claim 5]
After the backwashing operation is performed in any of the filter chambers, the dust collection operation is performed in all the filter chambers before the backwashing operation is performed in the other filter chambers.
The operation method of the dust collection equipment of Claim 4.

[Invention of Claim 6]
Prior to changing the inlet side flow path of the exhaust gas and the outlet side flow path of the clean gas to the open state, the pressure in the filter chamber to which the inlet side flow path and the outlet side flow path are connected is released.
The operation method of the dust collection equipment of Claim 4 or Claim 5.

[Invention of Claim 7]
Prior to changing the exhaust gas inlet-side flow path and the clean gas outlet-side flow path to the closed state, the exhaust gas inlet-side flow path and the clean gas outlet-side flow path exist. Check the
The operation method of the dust collection equipment of any one of Claims 4-6.

  According to the present invention, the dust collection facility, the heat treatment system, and the operation method of the dust collection facility are free from the risk of the fine particles flowing back during backwashing.

It is the dust collection equipment which concerns on 1st Embodiment. It is the dust collection equipment which concerns on 2nd Embodiment. It is the dust collection equipment which concerns on 3rd Embodiment. It is a conventional dust collection facility.

  Next, the form for implementing this invention is demonstrated. Note that the following description of the embodiment is merely an example, and is not intended to limit the present invention, its application, or its use.

[First Embodiment]
FIG. 1 shows a dust collection facility X1 according to the first embodiment.
The dust collection facility X1 of this embodiment is a facility that collects particulates in the exhaust gas G1 discharged from the heat treatment apparatus 110 and discharges it as a clean gas G3. The heat treatment apparatus 110 has the same structure as the heat treatment apparatus 110 described with reference to FIG. 4 and has a sliding portion that faces the heat treatment chamber 113. This sliding portion is a portion indicated by reference numeral C in FIG. 4, but in FIG. 1 and FIGS. 2 and 3 referred to below, the sliding portion is shown in order to facilitate understanding of the drawings. The symbol of is omitted.

  Examples of the heat treatment apparatus 110 include a rotary kiln, a steam tube dryer (STD), a call-in tube, and the like. Moreover, as heat processing, drying, combustion, thermal decomposition, cooling, etc. can be illustrated, for example. Furthermore, examples of the object to be processed S to be heat-treated include a slurry containing fine particles such as metal fine particles, an aggregate of fine particles themselves, that is, a powder and the like. The fine particles are not limited to metal fine particles. For example, the fine particles may adhere to sliding parts such as batteries, electronic materials, catalytic foods, pigments, and inorganic and organic fine particles, or may cause the sliding parts to wear. A variety of things can be illustrated.

  The exhaust gas G1 discharged from the heat treatment apparatus 110 is sent to the dust collection facility X1 through the inlet-side flow path 3 formed of a duct or the like. The inlet side flow path 3 is branched into two or more paths on the front end side, that is, the dust collector X1 side, and in the illustrated example, is branched into a first inlet side flow path 3A and a second inlet side flow path 3B.

  The first inlet-side channel 3A is provided with a first inlet-side on-off valve 15A, and the exhaust gas flowing in the first inlet-side channel 3A according to the opening and closing of the first inlet-side on-off valve 15A. The flow of the gas G1 is configured to be controllable. Similarly, the second inlet-side channel 3B is provided with a second inlet-side on / off valve 15B, and the second inlet-side channel 3B is opened and closed according to the opening / closing of the second inlet-side on / off valve 15B. The flow of the exhaust gas G1 flowing through the engine can be controlled.

  Examples of the first inlet-side on-off valve 15A and the second inlet-side on-off valve 15B, and a first outlet-side on-off valve 16A and a second outlet-side on-off valve 16B described later include butterfly valves, ball valves, and globes. Valves, slide gates, etc. can be used. In addition, it is more preferable that the dust collection equipment X of the present embodiment is provided with detection means (not shown) such as a limit switch and an open / close sensor that detect the open / close state of these open / close valves 15A, 15B, 16A, and 16B. The reason why it is suitable will be described later. The open / close state of the open / close valves 15A, 15B, 16A, and 16B only needs to detect at least one of the open state and the closed state, but a means for detecting a specific opening degree can also be used.

  In the following description, the first inlet side on / off valve 15A and the second inlet side on / off valve 15B are also simply referred to as “entry side on / off valves 15A and 15B”, and similarly, the first outlet side on / off valve 16A and second The outlet side on-off valve 16B is also simply referred to as “outside on-off valves 15A, 15B”. In addition, the first inlet-side on-off valve 15A and the first outlet-side on-off valve 16A are also simply referred to as “first on-off valves 15A, 16A”. Similarly, the second inlet-side on-off valve 15A and the second outlet-side on-off valve 15A The side opening / closing valve 16B is also simply referred to as “second opening / closing valves 15B, 16B”.

  The exhaust gas G1 that has flowed through the first inlet-side channel 3A or the second inlet-side channel 3B is collected by a bag filter device that constitutes the dust collection facility X1. This bag filter device includes two or more filter chambers. In the illustrated example, a bag filter device having a plurality of filter chambers is employed, but the present invention is not limited to one constituted by a single bag filter. For example, two or more bug filters having one filter chamber may be installed in parallel to form a bug filter device including a plurality of bug filters.

  In this embodiment, the first filter chamber 11A to which the first inlet-side channel 3A is connected and the second filter chamber 11B to which the second inlet-side channel 3B is connected are provided. The exhaust gas G1 that has flowed through the first inlet-side flow path 3A flows into the first filter chamber 11A, and the exhaust gas G1 that has flowed through the second inlet-side flow path 3B is within the second filter chamber 11B. Flow into.

  Each of the plurality of filter chambers is provided with a filter material that captures particulates in the exhaust gas G1. In the illustrated example, a first filter material 12A is provided in the first filter chamber 11A, and the first filter material 12A causes the inside of the first filter chamber 11A to be in the upstream dust collection region and the downstream side. It is divided into clean areas. Similarly, a second filter material 12B is provided in the second filter chamber 11B, and the second filter material 12B causes the second filter chamber 11B to have an upstream dust collection region and a downstream side. It is divided into clean areas.

  When the exhaust gas G1 flowing into the first filter chamber 11A passes through the first filter material 12A, particulates contained in the exhaust gas G1 are captured and become the clean gas G3. Similarly, when the exhaust gas G1 flowing into the second filter chamber 11B passes through the second filter material 12B, particulates contained in the exhaust gas G1 are captured and become the clean gas G3.

  The bag-side filter device having the first filter chamber 11A and the second filter chamber 11B is connected to the outlet-side flow path 4 including a duct through which the clean gas G3 flows. The outlet side flow path 4 is branched into a plurality of two or more paths on the base end side, that is, the bag filter device side, and in the illustrated example, is branched into a first output side flow path 4A and a second output side flow path 4B. The clean gas G3 in the first filter chamber 11A is discharged through the first outlet channel 4A. Similarly, the clean gas G3 in the second filter chamber 11B is discharged through the second outlet channel 4B. Note that the device indicated by reference numeral B provided on the distal end side of the outlet side flow path 4 is a suction means including a suction blower or the like.

  The first outlet-side flow path 4A is provided with a first outlet-side on-off valve 16A, and the clean flowing in the first outlet-side channel 4A according to the opening and closing of the first outlet-side on-off valve 16A. The flow of the gas G3 is configured to be controllable. Similarly, the second outlet channel 4B is provided with a second outlet valve 16B, and the second outlet channel 4B is opened and closed according to the opening and closing of the second outlet valve 16B. The flow of the clean gas G3 flowing through the gas can be controlled.

  Further, a branch path is connected to the first outlet flow path 4A upstream of the first outlet side opening / closing valve 16A, and a check valve 17A serving as a pressure release means is provided in the branch path. Yes. Similarly, a branch passage is connected to the second outlet flow passage 4B upstream of the second outlet on-off valve 16B, and a check valve 17B as pressure release means is provided in the branch passage. ing. In the check valves 17A and 17B, gas such as clean gas G3 and compressed air A to be described later flows from the outlet side passages 4A and 4B through the branch passage to the outside of the system, but the gas outside the system enters the branch passage. Is configured not to flow in.

  In addition, the on / off valves 15A and 15B and the outlet on / off valves 16A and 16B are controlled to open and close by a control means (not shown). The control means receives the opening / closing states of the inlet side opening / closing valves 15A, 15B and the outlet side opening / closing valves 16A, 16B from detection means such as limit switches and opening / closing sensors installed in the valves, and the opening / closing states of the valves are determined. An open / close signal is transmitted to each valve so as to obtain a desired state.

Next, an example of the operation method of the dust collection equipment X1 will be described.
In the operation method of this embodiment, first, if necessary, all the on-off valves 15A, 15B, 16A, and 16B are once opened. This open state can be confirmed, for example, by using the detection means.

  Next, one of the first on-off valves 15A and 16A and the second on-off valves 15B and 16B is changed to, for example, the second on-off valves 15B and 16B are closed. In this state, the exhaust gas G1 discharged from the heat treatment apparatus 100 flows into the first filter chamber 11A, which is a predetermined filter chamber, through the first inlet-side flow path 3A. The exhaust gas G1 flowing into the first filter chamber 11A is the first clean gas G3 after the particulate matter in the exhaust gas G1 is captured by the first filter material 12A, that is, after dust collection processing is performed. Is discharged through the outlet side flow path 4A (dust collection step). On the other hand, since the second on-off valves 15B and 16B are closed, the exhaust gas G1 does not flow into the second filter chamber 11B, which is another filter chamber. The second filter chamber 11B is placed outside the system.

  Next, the first on-off valves 15A and 16A are changed to the closed state, and the second on-off valves 15B and 16B are changed to the open state. In this state, the exhaust gas G1 discharged from the heat treatment apparatus 110 flows into the second filter chamber 11B through the second inlet channel 3B. The exhaust gas G1 that has flowed into the second filter chamber 11B is the second clean gas G3 after the particulate matter in the exhaust gas G1 is captured by the second filter material 12B, that is, after dust collection processing. Is discharged through the outlet side flow path 4B. On the other hand, since the first on-off valves 15A and 16A are changed to the closed state, the exhaust gas G1 does not flow into the first filter chamber 11A, and the first filter chamber 11A is a system in terms of dust collection processing. I will be outside.

By the way, changing the first on-off valves 15A and 16A to the closed state and changing the second on-off valves 15B and 16B to the open state can be performed at the same time, but all the on-off valves 15A, 15B and 16A. , 16B may be in a closed state.
That is, since the carrier gas G2 continues to flow into the heat treatment chamber 113 of the heat treatment apparatus 110, when all the on-off valves 15A, 15B, 16A, and 16B are closed, the exhaust gas G1 has no place to go, so There is a risk of causing a temperature change and a pressure increase, and fine particles in the heat treatment chamber 113 may stay and be caught in the sliding portion.

  Therefore, in changing the open / close state of the open / close valves 15A, 15B, 16A, 16B, first, the second open / close valve 15B, 16B is changed to the open state, and after confirming this open state using the detection means, It is preferable to change the first on-off valves 15A and 16A to the closed state. According to this embodiment, the exhaust gas G1 flows into both the first filter chamber 11A and the second filter chamber 11B while all the on-off valves 15A, 15B, 16A, 16B are open, and both filters Dust collection processing is performed in the chambers 11A and 11B, but there is no particular problem due to this, and conversely, the problem that the exhaust gas G1 has no place to go is solved. As is apparent from this point of view, the open state of the second on-off valves 15B and 16B is not limited to the fully open state, and the opening may be at least enough to allow the exhaust gas G1 to pass through the second filter chamber 11B. That's fine.

  When the first on-off valves 15A and 16A are closed and the second on-off valves 15B and 16B are opened as described above, backwashing of the first filter material 12A is performed using backwashing means (not shown). (Back washing process). In this backwashing process, backwashing gas, compressed air A in the illustrated example, is sprayed from the clean area side surface of the filter material 12A toward the dust collection area side surface. The compressed gas A can be performed by blowing in a pulse shape, for example. Due to the blowing of the compressed air A, the fine particles adhering to the filter material 12A are removed from the filter material 12A. In this regard, with the conventional dust collection facility (100), there is a possibility that the fine particles that have been wiped out will flow back into the heat treatment chamber 113 through the inlet-side flow path. However, in the dust collection equipment X1 of this embodiment, the inlet side flow path 3A is closed by the first inlet side opening / closing valve 15A, and the first filter chamber 11A is out of the system, so that the fine particles flow backward. There is no risk.

  Thereafter, by repeatedly switching the open / close state of the first on-off valves 15A and 16A and the second on-off valves 15B and 16B, the back-washing of the filter materials 12A and 12B is performed periodically while continuously performing the dust collection process. Can be done. However, for example, before the first on-off valves 15A and 16A or the second on-off valves 15B and 16B are closed, both the first on-off valves 15A and 16A and the second on-off valves 15B and 16B are used. Is opened, dust collection is performed in both the first filter chamber 11A and the second filter chamber 11B, and then the first on-off valve 15A, 16A or the second on-off valve 15B, 16B is closed. It can also be. In other words, the present invention does not always require that the backwashing operation is performed in any one of the plurality of filter chambers, and the dust collection operation is performed in at least one of the plurality of filter chambers. As long as there is a backwashing operation in any one of the filter chambers as appropriate, it is possible to assume a state in which the dust collection operation is performed in all the filter chambers.

  In addition, the timing of performing the backwashing process is performed by a control such as a timer that is performed every predetermined time, or a pressure loss in the filter chamber is measured and the pressure loss is a predetermined numerical value or more. be able to.

  By the way, when the compressed air A is blown into the filter chambers 11A and 11B in order to backwash the filter materials 12A and 12B, particularly when the compressed air is blown in a pulse shape, the internal pressure of the filter chambers 11A and 11B increases. When the inlet side on-off valves 15A and 15B are changed from the closed state to the opened state in a state where the internal pressures of the filter chambers 11A and 11B are increased, the fine particles in the filter chambers 11A and 11B pass through the inlet side flow paths 3A and 3B. There is a risk of backflow in 113. However, in the dust collection equipment X1 of this embodiment, check valves 17A and 17B, which are pressure release means, are provided in the middle of the branch paths branched from the outlet-side flow paths 4A and 4B. Therefore, since the internal pressure of the filter chambers 11A and 11B is released through the check valves 17A and 17B, when the inlet-side on-off valves 15A and 15B are changed to the open state, the filter chambers 11A and 11B are directed toward the heat treatment chamber 113. Therefore, there is no possibility that the gas flows, and there is no possibility that the fine particles in the filter chambers 11A and 11B flow backward into the heat treatment chamber 113 through the inlet-side flow paths 3A and 3B.

  Since the branch passages are connected to the outlet flow paths 4A and 4B, and the outlet flow paths 4A and 4B are connected to the clean region side of the filter chambers 12A and 12B, the filter is passed through the check valves 17A and 17B. There is no possibility that the fine particles in the chambers 11A and 11B will flow out. Even if the check valves 17A and 17B are not actuated by driving the outlet side opening / closing valves 16A and 16B in the opening direction first and then driving the inlet side opening and closing valves 15A and 15B in the opening direction. The pressure in the filter can be released to the outlet channels 4A and 4B.

[Second Embodiment]
Next, with reference to FIG. 2, the dust collection facility X2 according to the second embodiment will be described focusing on differences from the dust collection facility X1 according to the first embodiment.
The dust collection facility X2 of this embodiment is also a facility that collects particulates in the exhaust gas G1 discharged from the heat treatment apparatus 110 and discharges it as a clean gas G3. However, the dust collection equipment X2 of the present embodiment is different from the dust collection equipment X1 described above in the following points.

  First, in the dust collection facility X1, the inlet side valve means is provided in the middle of the first inlet side opening / closing valve 15A provided in the middle of the first inlet side channel 3A and in the middle of the second inlet side channel 3B. 2 entrance side on-off valve 15B. However, in the dust collection facility X2, the inlet side valve means is configured by a three-way valve 15C provided at a position where the inlet side channel 3 branches into the first inlet side channel 3A and the second inlet side channel 3B. ing. By controlling the three-way valve 15C, the inlet-side flow paths 3A and 3B can be opened and closed separately. Specifically, the exhaust gas G1 flows only in the first inlet-side flow path 3A. Alternatively, it can be switched so as to circulate only in the second inlet-side flow path 3B.

  Similarly, in the dust collection equipment X1, the outlet valve means is provided in the middle of the first outlet side opening / closing valve 16A provided in the middle of the first outlet side flow path 4A and in the middle of the second outlet side flow path 4B. It comprised with the 2nd exit side on-off valve 16B. However, in the dust collection equipment X2, the outlet valve means is configured by a three-way valve 16C provided at a position where the first outlet flow path 4A and the second outlet flow path 4B join. By controlling the three-way valve 16C, the outlet channels 4A and 4B can be opened and closed separately. Specifically, the clean gas G3 flows only in the first outlet channel 4A. Or it can switch so that it may distribute | circulate only in the 2nd exit side flow path 4B.

  According to the second embodiment, since the inlet side valve means and the outlet side valve means have a simple structure, the equipment cost can be reduced. The three-way valves 15C and 16C are provided in one of the first inlet side channel 3A or the second inlet side channel 3B, or one of the first outlet side channel 4A or the second outlet side channel 4B. However, the exhaust gas G1 and the clean gas G3 are not circulated. Therefore, it is possible to avoid the problem of malfunction such as when the on-off valve is used, for example, the problem that the gas in the filter chambers 11A and 11B flows back to the heat treatment chamber 113 during backwashing due to malfunction. it can. In addition, switching between the dust collection process and the backwash process can be performed quickly, and in some cases, the installation of the detection means can be eliminated.

[Third Embodiment]
Next, with reference to FIG. 3, the dust collection facility X3 according to the third embodiment will be described focusing on differences from the dust collection facility X2 according to the second embodiment.
The dust collection facility X3 of this embodiment is also a facility that collects particulates in the exhaust gas G1 discharged from the heat treatment apparatus 110 and discharges it as a clean gas G3. However, the dust collection facility X3 of the present embodiment is different from the dust collection facility X2 described above in the following points.

  First, in the dust collection facility X2, the first filter chamber 11A and the second filter chamber 11B are configured by separate dust collection containers. However, in the dust collection facility X3, a plurality of filter chambers are formed by partitioning the inner space of one dust collection container 11 by the partition wall 11x. In the illustrated example, the first filter chamber 11A and the second filter chamber 11 A filter chamber 11B is formed.

  Further, in the dust collection equipment X3, the inlet-side flow paths 3A and 3B are connected to the bottom surfaces of the filter chambers 11A and 11B. Similarly, the outlet channels 4A and 4B are connected to the top surfaces of the filter chambers 11A and 11B.

  In the dust collection facility X3, as in the dust collection facility X2, the inlet side valve means is constituted by the three-way valve 15C, and the outlet side valve means is constituted by the three-way valve 16C. However, as in the case of the dust collection equipment X1, in the dust collection equipment X3, the inlet side valve means is constituted by the inlet side opening / closing valves 15A, 15B, and the outlet side valve means is constituted by the outlet side opening / closing valves 16A, 16B. be able to.

[Others]
In the above first to third embodiments, the case where there are two filter chambers has been described. However, if necessary, a plurality of chambers of three or more may be used.

  INDUSTRIAL APPLICABILITY The present invention is applicable as a dust collection facility, a heat treatment system, and a method for operating a dust collection facility for fine particles contained in exhaust gas discharged from a heat treatment apparatus having a sliding portion that faces a heat treatment chamber.

  DESCRIPTION OF SYMBOLS 3 ... Input side flow path, 3A ... 1st input side flow path, 3B ... 2nd input side flow path, 4 ... Output side flow path, 4A ... 1st output side flow path, 4B ... 2nd output Side flow path, 11A ... first filter chamber, 11B ... second filter chamber, 12A ... first filter material, 12B ... second filter material, 15A ... first inlet side on-off valve, 15B ... second Inlet side on-off valve, 15C ... three-way valve, 16A ... first outlet-side on-off valve, 16B ... second outlet-side on-off valve, 16C ... three-way valve, 17A ... first check valve, 17B ... second Check valve, 100 ... heat treatment means, 101 ... filter chamber, 102 ... filter material, 111 ... rotating portion, 112 ... fixed portion, 113 ... heat treatment chamber, A ... air (air), C ... sliding portion, G1 ... Exhaust gas, G2 ... carrier gas, G3 ... clean gas, X1-3 ... dust collection equipment.

Claims (7)

A facility for collecting particulates in exhaust gas discharged from a heat treatment apparatus having a sliding portion facing the heat treatment chamber and discharging it as clean gas,
A filter chamber to which the exhaust gas inlet-side flow path and the clean gas outlet-side flow path are connected, a filter material disposed in the filter chamber for collecting particulates, and backwash gas is blown into the filter chamber. And backwashing means for backwashing the filter material,
A plurality of the filter chambers are provided, and the filter chambers are connected to the exhaust gas inlet-side flow path and the clean gas outlet-side flow path, respectively.
Inlet valve means capable of opening and closing the inlet side flow path of the exhaust gas, and outlet side valve means capable of opening and closing the outlet side flow path of the clean gas separately,
Furthermore, a pressure release means capable of releasing the internal pressure of the filter chamber is provided.
Dust collection equipment characterized by that. The inlet side valve means is provided separately for each of the inlet side flow paths of the exhaust gas,
The outlet valve means is provided for each outlet flow path of the clean gas,
A detecting means for detecting at least one of an open state or a closed state of the inlet valve means and the outlet valve means;
The dust collection facility according to claim 1. The dust collection facility according to claim 1 or 2, and a heat treatment apparatus comprising a steam tube dryer or a rotary kiln are provided.
A heat treatment system characterized by that. It is an operation method of equipment for collecting fine particles in exhaust gas discharged from a heat treatment apparatus having a sliding part facing the heat treatment chamber and discharging it as clean gas,
A filter chamber to which the exhaust gas inlet-side flow path and the clean gas outlet-side flow path are connected, a filter material disposed in the filter chamber for collecting particulates, and backwash gas is blown into the filter chamber. And a backwashing means for backwashing the filter material, and a method of operating a dust collection facility comprising:
A plurality of the filter chambers are provided as the dust collection facility, and the filter chambers are connected to the exhaust gas inlet side flow path and the clean gas outlet side flow path, respectively, and are equipped with the filter material. ,
In each of the filter chambers, the exhaust gas inlet-side flow path and the clean gas outlet-side flow path are opened to collect dust, and the exhaust gas inlet-side flow path and the clean gas are collected. After the gas outlet side flow path is closed, the backwashing operation of cleaning the filter material by blowing the backwash gas is performed,
And, in at least one filter chamber among the plurality of filter chambers, the opening and closing states of the inlet-side channel and the outlet-side channel are controlled so that the dust collection operation is performed.
The operation method of the dust collection equipment characterized by this. After the backwashing operation is performed in any of the filter chambers, the dust collection operation is performed in all the filter chambers before the backwashing operation is performed in the other filter chambers.
The operation method of the dust collection equipment of Claim 4. Prior to changing the inlet side flow path of the exhaust gas and the outlet side flow path of the clean gas to the open state, the pressure in the filter chamber to which the inlet side flow path and the outlet side flow path are connected is released.
The operation method of the dust collection equipment of Claim 4 or Claim 5. Prior to changing the exhaust gas inlet-side flow path and the clean gas outlet-side flow path to the closed state, the exhaust gas inlet-side flow path and the clean gas outlet-side flow path exist. Check the
The operation method of the dust collection equipment of any one of Claims 4-6.

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