JP2020049453A - Operational method of filter press and pressure tank-integrated filter press - Google Patents

Operational method of filter press and pressure tank-integrated filter press Download PDF

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JP2020049453A
JP2020049453A JP2018183176A JP2018183176A JP2020049453A JP 2020049453 A JP2020049453 A JP 2020049453A JP 2018183176 A JP2018183176 A JP 2018183176A JP 2018183176 A JP2018183176 A JP 2018183176A JP 2020049453 A JP2020049453 A JP 2020049453A
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diaphragm
pressure
filter plate
filter
chamber
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JP7022279B2 (en
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康昭 西原
Yasuaki Nishihara
康昭 西原
山下 学
Manabu Yamashita
学 山下
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Ishigaki Co Ltd
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Abstract

To provide an operational method of a filter press and a pressure tank-integrated filter press where a pressure tank is not needed by utilizing the diaphragm of the filter press as the pressure tank.SOLUTION: In an operational method of a filter press including a press-in step S1 forming a dewatering cake by pressing-in a stock solution into a filter chamber 9 formed with a lot of filter plates 4 and diaphragm filter plates 5, an air compression step S2 feeding compressed-air into a diaphragm chamber 12 formed in the filter chamber 9 and a water compression step S3 feeding pressure water into the diaphragm chamber 12 after the air compression step S2, the air compression step S2 is continued until the thickness of the dewatering cake formed in the filter chamber 9 by the expansion of a diaphragm 5a becomes 1/4-2/3 of the thickness of the filter chamber 9, a large amount of the compressed-air can be held in the diaphragm and then a pressure tank is not needed outside.SELECTED DRAWING: Figure 3

Description

本発明は、上水・工水スラッジ処理、及び化学工業、製紙パルプ工業等の各種生産プロセスにおいて、中・長時間圧搾脱水処理を必要とするダイアフラムろ板を有するフィルタープレスの運転方法及び圧力タンク一体型フィルタープレスに関する。 The present invention relates to a method for operating a filter press having a diaphragm filter plate that requires medium and long-term compression dewatering treatment and a pressure tank in various production processes such as tap water / industrial sludge treatment, and chemical industry and paper pulp industry. It relates to an integrated filter press.

従来、フィルタープレスでは高圧搾脱水するために原液をろ過室に圧入してろ過脱水後、圧力流体をダイアフラムろ板に圧入して圧搾脱水をしており、中・長時間圧搾脱水処理では、圧搾圧力を維持するために圧搾中は継続して圧力ポンプを作動している。
圧搾脱水にはダイアフラムに圧縮空気を供給して一次圧搾を行い、さらに圧力水を供給して高圧の二次圧搾を行う圧搾脱水方法が、特許文献1に開示されている。
Conventionally, in a filter press, in order to perform high-pressure squeezing and dewatering, the undiluted solution is pressed into the filtration chamber and filtered and dewatered. In order to maintain the pressure, the pressure pump is continuously operated during the squeezing.
Patent Literature 1 discloses a compression dehydration method in which compressed air is supplied to a diaphragm to perform primary compression, and then pressurized water is supplied to perform high-pressure secondary compression.

そして、圧力水の圧搾圧力を維持するために圧力タンクを利用すると共に、フィルタープレスに大容量のダイアフラムを設け、大容量のダイアフラムを圧力タンクの代わりとして利用する技術が、特許文献2に開示されている。 Patent Document 2 discloses a technique in which a pressure tank is used to maintain the compression pressure of pressurized water, a large-capacity diaphragm is provided in a filter press, and a large-capacity diaphragm is used as a substitute for the pressure tank. ing.

特公平02−12122号公報Japanese Patent Publication No. 02-12122 特許4911369号公報Japanese Patent No. 4911369

特許文献1のフィルタープレスでは、圧搾時間が長くなると圧力水の圧搾圧力を一定に維持するため、圧力水ポンプを長時間稼働させる必要があった。
また、特許文献2のフィルタープレスでは圧力水ポンプの稼働時間を短くするため、圧力タンクとしてフィルタープレスの両端に大容量のダイアフラムを設けているが、フィルタープレスが大型になってしまう問題があった。
In the filter press of Patent Literature 1, it is necessary to operate the pressure water pump for a long time in order to keep the pressure of the pressurized water constant when the compression time becomes long.
Further, in the filter press of Patent Document 2, large-diameter diaphragms are provided at both ends of the filter press as pressure tanks in order to shorten the operation time of the pressure water pump, but there is a problem that the filter press becomes large. .

さらに、大容量のダイアフラムには、通常のダイアフラムと比べて圧縮空気と圧力水を大量に供給するため、空気と水が大量に必要となり、それらを供給するポンプの動力も大きなものとなっていた。 Furthermore, large-diameter diaphragms require a large amount of air and water to supply a large amount of compressed air and pressurized water as compared to a normal diaphragm, and the power of a pump that supplies them is also large. .

本発明は、大容量のダイアフラムを用いることなく、圧縮空気による圧搾脱水でダイアフラム室を圧力タンクとして利用するフィルタープレスの運転方法を提供する。 The present invention provides a method of operating a filter press that uses a diaphragm chamber as a pressure tank by compression dehydration with compressed air without using a large-capacity diaphragm.

多数のろ板とダイアフラムろ板で形成されるろ過室に原液を圧入して脱水ケーキを生成する圧入工程と、ろ過室に形成されるダイアフラム室に圧縮空気を供給する空気圧搾工程と、空気圧搾工程後にダイアフラム室に圧力水を供給する水圧搾工程と、を備えるフィルタープレスの運転方法において、前記空気圧搾工程は、ダイアフラムの膨張によりろ過室で生成される脱水ケーキの厚みがろ過室の厚みの1/4〜2/3幅になるまで継続することで、大量の圧縮空気をダイアフラム内に保持することができ、外部に圧力タンクを設ける必要がない。 A press-fitting step in which the undiluted solution is pressed into a filtration chamber formed by a number of filter plates and diaphragm filter plates to generate a dewatered cake; an air-pressing step of supplying compressed air to a diaphragm chamber formed in the filtration chamber; A water pressing step of supplying pressurized water to the diaphragm chamber after the step, and the operating method of the filter press, wherein the air pressing step is such that the thickness of the dewatered cake generated in the filtration chamber by the expansion of the diaphragm is the thickness of the filtration chamber. By continuing until the width becomes 1/4 to 2/3, a large amount of compressed air can be held in the diaphragm, and there is no need to provide an external pressure tank.

前記ダイアフラムろ板の何れか1つ以上を圧力ろ板とし、前記圧入工程で圧力ろ板で形成されるろ過室に原液を圧入しないことで、圧縮空気の保持量を増加させることができる。 Any one or more of the diaphragm filter plates may be used as a pressure filter plate, and the holding amount of the compressed air can be increased by not pressing the stock solution into the filtration chamber formed by the pressure filter plate in the press-fitting step.

前記圧力ろ板のダイアフラム室の容積は、他のダイアフラム室の合計容積の1/50〜1/20であることで、水圧搾工程の圧力水ポンプの駆動回数が低減する。 Since the volume of the diaphragm chamber of the pressure filter plate is 1/50 to 1/20 of the total volume of the other diaphragm chambers, the number of times the pressure water pump is driven in the water pressing step is reduced.

前記脱水ケーキの厚みは、ろ過室から排出されたろ液の流量と、原液濃度と、原液供給量に基づき算出することで、脱水ケーキの厚みを把握することができる。 The thickness of the dewatered cake can be determined by calculating the thickness of the dewatered cake based on the flow rate of the filtrate discharged from the filtration chamber, the concentration of the stock solution, and the supply amount of the stock solution.

多数のろ板とダイアフラムろ板で形成されるろ過室に原液を圧入して脱水ケーキを生成するフィルタープレスにおいて、ダイアフラムろ板の何れか1つ以上を圧力ろ板とし、ダイアフラムろ板と圧力ろ板に形成するダイアフラム室に圧縮空気を供給する圧縮空気管と、圧力水を供給する圧力水供給管を接続すると共に、ろ板とダイアフラムろ板間に形成されるろ過室のみに原液供給管26を連通することで、大量の圧縮空気をダイアフラム内に保持することができ、外部に圧力タンクを設ける必要がない。 In a filter press that presses a stock solution into a filtration chamber formed by a number of filter plates and a diaphragm filter plate to generate a dewatered cake, at least one of the diaphragm filter plates is used as a pressure filter plate, and the diaphragm filter plate and the pressure filter are used. A compressed air pipe for supplying compressed air to a diaphragm chamber formed on the plate and a pressure water supply pipe for supplying pressurized water are connected, and the undiluted solution supply pipe 26 is provided only to the filtration chamber formed between the filter plate and the diaphragm filter plate. , A large amount of compressed air can be held in the diaphragm, and there is no need to provide an external pressure tank.

前記圧力ろ板のダイアフラム室の容積は、他のダイアフラムろ板のダイアフラム室の合計容積の1/50〜1/20であることで、水圧搾工程の圧力水ポンプの駆動回数が低減する。 Since the volume of the diaphragm chamber of the pressure filter plate is 1/50 to 1/20 of the total volume of the diaphragm chambers of the other diaphragm filter plates, the number of times of driving the pressure water pump in the water squeezing step is reduced.

前記ろ過室からろ液を排出する排出管に流量計を備えると共に、流量計が測定したろ液流量を基にろ過室内の脱水ケーキの厚みを算出し、脱水ケーキの厚みがろ過室の厚みの1/4〜2/3幅となった場合、圧縮空気管の圧縮空気弁と圧力水供給管の圧力水弁を切り替える制御盤と、を備えることで、圧縮空気を十分に保持した状態で水圧搾工程に移行する。 A flow meter is provided in the discharge pipe for discharging the filtrate from the filtration chamber, and the thickness of the dewatered cake in the filtration chamber is calculated based on the filtrate flow rate measured by the flow meter, and the thickness of the dewatered cake is the thickness of the filtration chamber. When the width becomes 1/4 to 2/3, by providing a control panel for switching between a compressed air valve of a compressed air pipe and a pressure water valve of a pressure water supply pipe, water is supplied in a state where compressed air is sufficiently held. Move on to the pressing process.

前記圧力ろ板はろ板とダイアフラムろ板の一端に配置し、圧力ろ板に張設するダイアフラムは薄膜のゴムであることで、圧力ろ板の製作コストを削減できる。 The pressure filter plate is disposed at one end of the filter plate and the diaphragm filter plate, and the diaphragm stretched over the pressure filter plate is a thin film rubber, so that the manufacturing cost of the pressure filter plate can be reduced.

通常の大きさのダイアフラムを圧力タンクとして利用するため、大容量のダイアフラムが不要となりフィルタープレスを小型化できる。
また、脱水ケーキがろ過室の1/4〜2/3幅となるまでダイアフラムに圧縮空気を供給することで、ろ過室の3/4〜1/3幅分の大量の圧縮空気をダイアフラム内に保持することができる。
圧縮空気により圧力水の降圧が緩やかになるため、頻繁に圧力水ポンプを稼働させる必要が無く、稼働時間も短縮できる。
Since a normal-sized diaphragm is used as a pressure tank, a large-capacity diaphragm is not required, and the size of the filter press can be reduced.
Also, by supplying compressed air to the diaphragm until the dewatered cake becomes 1/4 to 2/3 of the width of the filtration chamber, a large amount of compressed air for 3/4 to 1/3 of the width of the filtration chamber is introduced into the diaphragm. Can be held.
Since the pressure drop of the pressurized water is moderated by the compressed air, it is not necessary to frequently operate the pressure water pump, and the operation time can be reduced.

本発明に係るフィルタープレスのフロー図である。It is a flow figure of the filter press concerning the present invention. 同じく、並列するろ板とダイアフラムの一部縦断斜視図である。Similarly, it is a partial longitudinal perspective view of a filter plate and a diaphragm arranged in parallel. 同じく、並列したろ板の一端に圧力ろ板を配置したフィルタープレスの概念図である。Similarly, it is a conceptual diagram of a filter press in which a pressure filter plate is arranged at one end of a parallel filter plate.

図1は、本発明に係るフィルタープレスのフロー図である。
フィルタープレスは、フロントフレーム1とリアフレーム2に一対のガイドレール3を橋架してあり、ガイドレール3に多数のろ板4とダイアフラムろ板5を交互に支架して、並列したろ板4とダイアフラムろ板5の一端部に、圧縮空気溜りを大きくする圧力ろ板6を配設してある。
リアフレーム2に配設した締付シリンダー7がムーバブルヘッド8に連結してあり、締付シリンダー7で並列したろ板4とダイアフラムろ板5を開閉させる。
FIG. 1 is a flowchart of a filter press according to the present invention.
In the filter press, a pair of guide rails 3 are bridged between a front frame 1 and a rear frame 2, and a number of filter plates 4 and diaphragm filter plates 5 are alternately supported on the guide rails 3 to form a parallel filter plate 4. At one end of the diaphragm filter plate 5, a pressure filter plate 6 for increasing the compressed air pool is provided.
A tightening cylinder 7 disposed on the rear frame 2 is connected to the movable head 8 and opens and closes the filter plate 4 and the diaphragm filter plate 5 arranged in parallel by the tightening cylinder 7.

図2は、並列するろ板とダイアフラムろ板の一部縦断斜視図である。
ろ板4とダイアフラムろ板5で形成するろ過室9に一対のろ布10が吊設してあり、ろ板4とダイアフラムろ板5を貫通する供給口11からろ布10間に原液を圧入する。
ダイアフラムろ板5には表面に膨張収縮可能なダイアフラム5aを張設してある。ダイアフラム5aを膨張することでろ過室9に供給した原液を圧搾し、ろ布10で固液分離を行う。
FIG. 2 is a partial longitudinal perspective view of a filter plate and a diaphragm filter plate arranged in parallel.
A pair of filter cloths 10 is suspended from a filter chamber 9 formed by the filter plate 4 and the diaphragm filter plate 5, and the undiluted solution is pressed into the filter cloth 10 from a supply port 11 penetrating the filter plate 4 and the diaphragm filter plate 5. I do.
The diaphragm filter plate 5 is provided with a diaphragm 5a which can expand and contract on the surface. The undiluted solution supplied to the filtration chamber 9 is squeezed by expanding the diaphragm 5a, and solid-liquid separation is performed by the filter cloth 10.

図3は、並列したろ板の一端に圧力ろ板を配置したフィルタープレスの概念図である。
ダイアフラムろ板5は、表面にダイアフラム5aを張設して内部にダイアフラム室12を形成してある。また、並列したろ板4とダイアフラムろ板5の一端には圧力ろ板6が配設してある。圧力ろ板6の表面にはダイアフラム6aが張設してあり、圧力ろ板6とダイアフラム5aの間にダイアフラム室12aを形成する。
FIG. 3 is a conceptual diagram of a filter press in which a pressure filter plate is disposed at one end of a parallel filter plate.
The diaphragm filter plate 5 has a diaphragm 5a stretched on the surface and a diaphragm chamber 12 formed therein. Further, a pressure filter plate 6 is provided at one end of the filter plate 4 and the diaphragm filter plate 5 arranged in parallel. A diaphragm 6a is stretched on the surface of the pressure filter plate 6, and a diaphragm chamber 12a is formed between the pressure filter plate 6 and the diaphragm 5a.

ダイアフラム室12に圧力流体を供給することでダイアフラム5aを膨張させる。本発明では全てのダイアフラム室12を連通し、ダイアフラムろ板5のダイアフラム室12と圧力ろ板6のダイアフラム室12aを圧力タンクとして利用する。圧力流体は、圧縮空気を供給した後、圧力水を供給してダイアフラム5aを膨張させる。 By supplying a pressure fluid to the diaphragm chamber 12, the diaphragm 5a is expanded. In the present invention, all the diaphragm chambers 12 are communicated, and the diaphragm chamber 12 of the diaphragm filter plate 5 and the diaphragm chamber 12a of the pressure filter plate 6 are used as a pressure tank. After supplying the compressed air, the pressure fluid supplies the pressurized water to expand the diaphragm 5a.

ダイアフラム室12は、脱水ケーキの厚みがろ過室の厚みの1/4〜2/3幅となるまで圧縮空気を供給し、膨張させることで、圧力タンクとして必要な空気量が充填される。なお、脱水ケーキの厚みがろ過室9の厚みの1/3幅となるまでダイアフラム室12を膨張させることで、後述する水圧搾工程S3のエネルギー効率が最も高くなる。 The diaphragm chamber 12 is supplied with compressed air until the thickness of the dewatered cake becomes 1/4 to 2/3 of the thickness of the filtration chamber, and is expanded, so that the required amount of air as a pressure tank is filled. In addition, by expanding the diaphragm chamber 12 until the thickness of the dewatered cake becomes 1/3 width of the thickness of the filtration chamber 9, the energy efficiency of the water pressing step S3 described later is the highest.

圧力ろ板6のダイアフラム室12aの容積は、多数並列したダイアフラムろ板5のダイアフラム室12の合計容積の1/50〜1/20とする。前記容積のダイアフラム室12aを備えることで、圧縮空気を十分保持することができるため、水圧搾工程S3の圧力水ポンプの駆動回数が低減する。
なお、圧力ろ板6とろ板4間に形成される空間を圧力室13とし、圧力室13は原液を供給せずに、ダイアフラム6aを膨張させる空間として使用する。ダイアフラム6aは脱水ケーキの圧搾に利用しないため、強度を必要とせず薄膜のゴムでよい。
The volume of the diaphragm chambers 12a of the pressure filter plates 6 is set to 1/50 to 1/20 of the total volume of the diaphragm chambers 12 of the diaphragm filter plates 5 arranged in parallel. Since the compressed air can be sufficiently held by providing the diaphragm chamber 12a having the above volume, the number of times the pressure water pump is driven in the water pressing step S3 is reduced.
The space formed between the pressure filter plate 6 and the filter plate 4 is referred to as a pressure chamber 13, and the pressure chamber 13 is used as a space for expanding the diaphragm 6a without supplying a stock solution. Since the diaphragm 6a is not used for squeezing the dewatered cake, it does not require strength and may be a thin film rubber.

本実施例では並列したろ板4とダイアフラムろ板5の一端に、一つの圧力ろ板6を配置しているが、複数の圧力ろ板6を配置することもできる。この際、複数の圧力ろ板6をろ板
4列の一端に集合させて配置する、又は複数の圧力ろ板6を分散させてろ板4間に配置する。
In this embodiment, one pressure filter plate 6 is disposed at one end of the filter plate 4 and the diaphragm filter plate 5 arranged in parallel, but a plurality of pressure filter plates 6 may be disposed. At this time, the plurality of pressure filter plates 6 are arranged collectively at one end of the four rows of filter plates, or the plurality of pressure filter plates 6 are dispersed and disposed between the filter plates 4.

図3に示すように、ダイアフラムろ板5のダイアフラム室12と、圧力ろ板6のダイアフラム室12aに圧力水供給管14と圧縮空気管15を接続してある。
図1に示すように、圧力水供給管14に給水槽16の水を圧送する圧力水ポンプ17と圧力水を入切する圧力水弁18が配設してある。圧縮空気管15に連結した空気槽19に圧縮空気を供給する空気圧縮機20と、圧縮空気管15に供給する圧縮空気を入切する圧縮空気弁21が配設してある。
As shown in FIG. 3, a pressure water supply pipe 14 and a compressed air pipe 15 are connected to the diaphragm chamber 12 of the diaphragm filter plate 5 and the diaphragm chamber 12a of the pressure filter plate 6.
As shown in FIG. 1, a pressure water pump 17 for pumping water in a water supply tank 16 to a pressure water supply pipe 14 and a pressure water valve 18 for turning on and off the pressure water are provided. An air compressor 20 for supplying compressed air to an air tank 19 connected to the compressed air pipe 15 and a compressed air valve 21 for turning on and off the compressed air supplied to the compressed air pipe 15 are provided.

空気圧縮機20と圧力水ポンプ17でダイアフラム室12に圧縮空気と圧力水を供給し、脱水ケーキの圧搾を行う。空気圧縮機20は0.7〜0.85MPaの圧縮空気をダイアフラム室12に供給し、圧力水ポンプ17は1.3〜1.6MPaの圧力水を供給する。 The compressed air and the pressure water are supplied to the diaphragm chamber 12 by the air compressor 20 and the pressure water pump 17, and the dewatered cake is compressed. The air compressor 20 supplies 0.7 to 0.85 MPa of compressed air to the diaphragm chamber 12, and the pressure water pump 17 supplies 1.3 to 1.6 MPa of pressure water.

また、ろ板4に連通した排出管22からろ液が排出され、排出管22に設けた流量計23でろ液の流量が検知される。 The filtrate is discharged from a discharge pipe 22 communicating with the filter plate 4, and the flow rate of the filtrate is detected by a flow meter 23 provided in the discharge pipe 22.

流量計23で検知した流量からろ液量を制御盤24で算出し、算出したろ液量を基に、圧力水ポンプ17と圧力水弁18、空気圧縮機20と圧縮空気弁21を制御盤24で制御して、ダイアフラム室12の圧縮空気圧を操作するようにしてある。 The control panel 24 calculates the amount of filtrate from the flow rate detected by the flow meter 23, and controls the pressure water pump 17, the pressure water valve 18, the air compressor 20 and the compressed air valve 21 based on the calculated amount of filtrate. At 24, the compressed air pressure in the diaphragm chamber 12 is controlled.

図1及び図2に示すように、原液圧入ポンプ25を配設した原液供給管26が、ろ板4とダイアフラムろ板5の間のろ過室9に連通させてある。
なお、図3にはろ過室9を形成するためにろ板4とダイアフラムろ板5を交互に並列しているが、ダイアフラムろ板5だけを並列してろ過室9を形成することで、ろ過室9の両面からダイアフラム5aで圧搾することが可能となる。
As shown in FIGS. 1 and 2, a stock solution supply pipe 26 provided with a stock solution press-fit pump 25 communicates with the filtration chamber 9 between the filter plate 4 and the diaphragm filter plate 5.
In FIG. 3, the filter plates 4 and the diaphragm filter plates 5 are alternately arranged in parallel to form the filtration chamber 9. However, by forming the filtration chamber 9 with only the diaphragm filter plates 5 arranged in parallel, the filtration It is possible to squeeze from both sides of the chamber 9 with the diaphragm 5a.

本発明で使用するフィルタープレスは上記のように構成してあり、その圧搾ろ過方法を以下に示す。
予めろ過室9の厚み、原液の固形分濃度を計測しておく。
予め締付シリンダー7を駆動させ、並列するろ板4とダイアフラムろ板5を閉板し、ろ過室9を形成する。
The filter press used in the present invention is configured as described above, and its squeezing filtration method is described below.
The thickness of the filtration chamber 9 and the solid content concentration of the stock solution are measured in advance.
The tightening cylinder 7 is driven in advance, and the filter plate 4 and the diaphragm filter plate 5 arranged in parallel are closed to form a filtration chamber 9.

圧入工程(S1)
原液圧入ポンプ25から原液供給管26を介して、フィルタープレスのろ過室9に原液を圧入してろ過を行う。この時、圧力室13には原液を供給しない。また、ダイアフラム室12には流体を供給しておらず、ろ過室9に原液が充満する。
ろ過室9に張設したろ布10が原液から液体を分離し、脱水ケーキが生成されると共に、ろ液は排出管22を介してろ過室9の外へ排出する。
Press-in process (S1)
The undiluted solution is injected into the filtration chamber 9 of the filter press from the undiluted solution injection pump 25 via the undiluted solution supply pipe 26 to perform filtration. At this time, the stock solution is not supplied to the pressure chamber 13. Further, no fluid is supplied to the diaphragm chamber 12, and the undiluted solution fills the filtration chamber 9.
The filter cloth 10 stretched in the filtration chamber 9 separates the liquid from the undiluted solution, a dewatered cake is generated, and the filtrate is discharged out of the filtration chamber 9 through the discharge pipe 22.

空気圧搾工程(S2)
原液の圧入を停止した後、空気圧縮機20を駆動して、圧縮空気弁21を操作し、ダイアフラムろ板5のダイアフラム室12と、圧力ろ板6のダイアフラム室12aに圧縮空気を供給し、0.85MPaまで昇圧する。昇圧後、空気圧縮機20を停止する。
圧縮空気によりダイアフラム室12、12aが膨張すると共に、ろ過室9に形成した脱水ケーキが圧縮され、脱水ケーキからはさらに液分が排出される。ろ液の排出に伴い、ダイアフラム室12、12aの内圧が低下するため、0.7MPaまで低下すると再び空気圧縮機20を駆動する。空気圧縮機20により、ダイアフラム室12、12aに圧縮空気を供給し、内圧を0.85MPaまで昇圧する。
Air pressing process (S2)
After stopping the injection of the undiluted solution, the air compressor 20 is driven, the compressed air valve 21 is operated, and compressed air is supplied to the diaphragm chamber 12 of the diaphragm filter plate 5 and the diaphragm chamber 12a of the pressure filter plate 6, The pressure is increased to 0.85 MPa. After the pressure increase, the air compressor 20 is stopped.
The compressed air expands the diaphragm chambers 12 and 12a, compresses the dewatered cake formed in the filtration chamber 9, and further discharges liquid from the dewatered cake. Since the internal pressure of the diaphragm chambers 12 and 12a decreases with the discharge of the filtrate, when the pressure drops to 0.7 MPa, the air compressor 20 is driven again. Compressed air is supplied to the diaphragm chambers 12 and 12a by the air compressor 20 to increase the internal pressure to 0.85 MPa.

ろ液は排出管22から排出され、排出管22の流量計23によりろ液の流量を検知する。
検知したろ液の流量、原液の固形分濃度、原液の供給量を基に、ろ過室9に形成された脱水ケーキの厚み(体積)を継続的に算出する。
空気圧搾を継続することによってろ液が排出されると共に、脱水ケーキの厚みが減少する。脱水ケーキの厚みが、ろ過室9の厚みの1/3になるのを算出すると、圧縮空気弁を閉じて空気圧縮機20を停止する。
The filtrate is discharged from the discharge pipe 22, and the flow rate of the filtrate is detected by the flow meter 23 of the discharge pipe 22.
The thickness (volume) of the dehydrated cake formed in the filtration chamber 9 is continuously calculated based on the detected flow rate of the filtrate, the solid content concentration of the stock solution, and the supply amount of the stock solution.
By continuing the air compression, the filtrate is discharged and the thickness of the dewatered cake is reduced. When the thickness of the dewatered cake is calculated to be 1/3 of the thickness of the filtration chamber 9, the compressed air valve is closed and the air compressor 20 is stopped.

なお、予め定めた時間内に脱水ケーキの厚みがろ過室9の厚みの1/3にならない場合、空気圧搾工程S2を終了し、次の工程へ移行する。 If the thickness of the dewatered cake does not become 1/3 of the thickness of the filtration chamber 9 within a predetermined time, the air pressing step S2 ends, and the process proceeds to the next step.

水圧搾工程(S3)
圧縮空気弁21を閉じた後、圧力水ポンプ17を駆動する。圧力水弁18を開放して圧力水をダイアフラム室12、12aに圧入する。ダイアフラム室12、12aの内圧を1.5MPaまで昇圧し、圧力水弁18を閉じ、圧力水ポンプ17を停止する。
Water pressing process (S3)
After closing the compressed air valve 21, the pressure water pump 17 is driven. The pressure water valve 18 is opened to pressurize the pressure water into the diaphragm chambers 12, 12a. The internal pressure of the diaphragm chambers 12 and 12a is increased to 1.5 MPa, the pressure water valve 18 is closed, and the pressure water pump 17 is stopped.

圧力水によりダイアフラム室12、12aはさらに高圧となり、ろ過室9内の脱水ケーキからさらに水分がろ布10により分離される。分離された水分はろ過室9から排出管22を通り排出される。ダイアフラム室12、12aには圧縮空気が供給されているため、水分がろ過室9から排出されることで、ダイアフラム室12、12aの内圧が徐々に低下していく。 The pressure of the diaphragm chambers 12 and 12 a is further increased by the pressurized water, and the moisture is further separated from the dewatered cake in the filtration chamber 9 by the filter cloth 10. The separated water is discharged from the filtration chamber 9 through the discharge pipe 22. Since compressed air is supplied to the diaphragm chambers 12 and 12a, the internal pressure of the diaphragm chambers 12 and 12a is gradually reduced by discharging moisture from the filtration chamber 9.

ダイアフラム室12、12aの内圧が圧搾の進行に伴い1.4MPaに低下したときに、再び圧力水ポンプ17を駆動させ、圧力水弁18を開くことで、ダイアフラム室12、12aの内圧を1.5MPaまで昇圧する。
この操作を複数回繰り返すことで水圧搾を行う。
When the internal pressure of the diaphragm chambers 12 and 12a decreases to 1.4 MPa with the progress of the squeezing, the pressure water pump 17 is driven again and the pressure water valve 18 is opened to reduce the internal pressure of the diaphragm chambers 12 and 12a to 1. Increase the pressure to 5 MPa.
Water pressing is performed by repeating this operation a plurality of times.

ダイアフラム室12、12aの内圧の変化に応じて、圧力水ポンプ17のON/OFF操作を繰り返した後、圧力水弁18を閉じ、圧力水ポンプ17を停止することで、ダイアフラム室12、12aの内圧を一定幅以内になるように調整し、圧搾脱水時の圧力水ポンプ17の運転時間を短縮する。
所定のろ液排出量を検知すると水圧搾工程S3を終了する。
After the ON / OFF operation of the pressure water pump 17 is repeated according to the change in the internal pressure of the diaphragm chambers 12 and 12a, the pressure water valve 18 is closed and the pressure water pump 17 is stopped, whereby the diaphragm chambers 12 and 12a are closed. The internal pressure is adjusted so as to be within a certain range, and the operation time of the pressure water pump 17 at the time of press dewatering is reduced.
When a predetermined filtrate discharge amount is detected, the water pressing step S3 ends.

圧力水排水工程(S4)
圧力水による水圧搾終了後、圧力水弁18を開放することで、ダイアフラム室12、12aの圧縮空気を利用して、ダイアフラム室12、12a内の圧力水を排出する。圧力水は圧力水供給管14を通って給水槽16へ排出される。その後、圧縮空気弁21を開放してダイアフラム室12、12aを常圧にする。
Pressure water drainage process (S4)
After the water squeezing by the pressurized water is completed, the pressurized water in the diaphragm chambers 12, 12a is discharged by using the compressed air in the diaphragm chambers 12, 12a by opening the pressure water valve 18. The pressurized water is discharged through a pressurized water supply pipe 14 to a water supply tank 16. Thereafter, the compressed air valve 21 is opened to bring the diaphragm chambers 12 and 12a to normal pressure.

脱水ケーキ排出工程(S5)
締付シリンダー7収縮してろ板4とダイアフラムろ板5を開板し、ろ過室9に形成された脱水ケーキを機外に排出する。続けてフィルタープレスを運転する場合は、ろ板4とダイアフラムろ板5を閉板して再びろ過室9を形成し、圧入工程S1へ戻る。
Dewatering cake discharge process (S5)
The tightening cylinder 7 contracts to open the filter plate 4 and the diaphragm filter plate 5, and the dewatered cake formed in the filtration chamber 9 is discharged outside the machine. When continuously operating the filter press, the filter plate 4 and the diaphragm filter plate 5 are closed to form the filtration chamber 9 again, and the process returns to the press-fitting step S1.

本発明は空気圧搾工程S2において、多量の圧縮空気を圧力室13のダイアフラム室12、12aに供給することで、ダイアフラム室12、12aを圧力タンクとして利用している。空気圧搾工程S2では、脱水ケーキの厚みが、例えばろ過室9の1/3幅となるまで空気圧搾を継続し、ろ過室9の2/3幅の容量の圧縮空気をダイアフラム室12に供給している。従って、大容量の圧力タンクを別途備えなくとも、圧縮空気を保持できる。 In the present invention, in the air compression step S2, a large amount of compressed air is supplied to the diaphragm chambers 12, 12a of the pressure chamber 13, so that the diaphragm chambers 12, 12a are used as pressure tanks. In the air pressing step S2, air pressing is continued until the thickness of the dewatered cake becomes, for example, 1/3 of the width of the filtration chamber 9, and compressed air having a capacity of 2/3 of the width of the filtration chamber 9 is supplied to the diaphragm chamber 12. ing. Therefore, compressed air can be retained without separately providing a large-capacity pressure tank.

よって、水圧搾工程S3では、ろ液の排出に応じてダイアフラム室12、12aの内圧の低下が緩やかとなり、ダイアフラム室12、12aの内圧を一定に維持するために圧力水ポンプ17の起動頻度、起動時間を大幅に減少することができる。
Therefore, in the water pressing step S3, the internal pressure of the diaphragm chambers 12 and 12a gradually decreases in accordance with the discharge of the filtrate, and the frequency of activation of the pressure water pump 17 to maintain the internal pressure of the diaphragm chambers 12 and 12a constant. Start-up time can be significantly reduced.

4 ろ板
5 ダイアフラムろ板
5a ダイアフラム
6 圧力ろ板
6a ダイアフラム
9 ろ過室
12 ダイアフラム室
12a ダイアフラム室
14 圧力水供給管
15 圧縮空気管
21 圧縮空気弁
22 排出管
23 流量計
24 制御盤
26 原液供給管
S1 圧入工程
S2 空気圧搾工程
S3 水圧搾工程
4 Filter Plate 5 Diaphragm Filter Plate 5a Diaphragm 6 Pressure Filter Plate 6a Diaphragm 9 Filtration Chamber 12 Diaphragm Chamber 12a Diaphragm Chamber 14 Pressure Water Supply Pipe 15 Compressed Air Pipe 21 Compressed Air Valve 22 Discharge Pipe 23 Flow Meter 24 Control Board 26 Stock Solution Supply Pipe S1 Press-in process S2 Air press process S3 Water press process

Claims (8)

多数のろ板(4)とダイアフラムろ板(5)で形成されるろ過室(9)に原液を圧入して脱水ケーキを生成する圧入工程(S1)と、
ろ過室(9)に形成されるダイアフラム室(12)に圧縮空気を供給する空気圧搾工程(S2)と、
空気圧搾工程(S2)後にダイアフラム室(12)に圧力水を供給する水圧搾工程(S3)と、を備えるフィルタープレスの運転方法において、
前記空気圧搾工程(S2)は、ダイアフラム(5a)の膨張によりろ過室(9)で生成される脱水ケーキの厚みがろ過室(9)の厚みの1/4〜2/3幅になるまで継続する
ことを特徴とするフィルタープレスの運転方法。
A press-in step (S1) in which the undiluted solution is pressed into a filtration chamber (9) formed by a large number of filter plates (4) and a diaphragm filter plate (5) to produce a dewatered cake;
An air compression step (S2) of supplying compressed air to a diaphragm chamber (12) formed in the filtration chamber (9);
A water press step (S3) of supplying pressurized water to the diaphragm chamber (12) after the air press step (S2).
The air pressing step (S2) is continued until the thickness of the dewatered cake generated in the filtration chamber (9) by the expansion of the diaphragm (5a) becomes 1/4 to 2/3 of the thickness of the filtration chamber (9). A method for operating a filter press, comprising:
前記ダイアフラムろ板(5)の何れか1つ以上を圧力ろ板(6)とし、
前記圧入工程(S1)で圧力ろ板(6)で形成されるろ過室(9)に原液を圧入しない
ことを特徴とする請求項1又は2に記載のフィルタープレスの運転方法。
Any one or more of the diaphragm filter plates (5) is a pressure filter plate (6),
The method for operating a filter press according to claim 1 or 2, wherein the undiluted solution is not pressed into the filtration chamber (9) formed by the pressure filter plate (6) in the pressing step (S1).
前記圧力ろ板(6)のダイアフラム室(12a)の容積は、他のダイアフラム室(12)の合計容積の1/50〜1/20である
ことを特徴とする請求項2に記載のフィルタープレスの運転方法。
The filter press according to claim 2, wherein the volume of the diaphragm chamber (12a) of the pressure filter plate (6) is 1/50 to 1/20 of the total volume of the other diaphragm chambers (12). Driving method.
前記脱水ケーキの厚みは、ろ過室(9)から排出されたろ液の流量と、原液濃度と、原液供給量に基づき算出する
ことを特徴とする請求項1乃至請求項3の何れか一項に記載のフィルタープレスの運転方法。
The thickness of the dewatered cake is calculated based on the flow rate of the filtrate discharged from the filtration chamber (9), the concentration of the stock solution, and the supply amount of the stock solution, according to any one of claims 1 to 3, wherein Operating method of the filter press described.
多数のろ板(4)とダイアフラムろ板(5)で形成されるろ過室(9)に原液を圧入して脱水ケーキを生成するフィルタープレスにおいて、
ダイアフラムろ板(5)の何れか1つ以上を圧力ろ板(6)とし、
ダイアフラムろ板(5)と圧力ろ板(6)に形成するダイアフラム室(12、12a)に圧縮空気を供給する圧縮空気管(15)と、圧力水を供給する圧力水供給管(14)を接続すると共に、
ろ板(4)とダイアフラムろ板(5)間に形成されるろ過室(9)のみに原液供給管(26)を連通する
ことを特徴とする圧力タンク一体型フィルタープレス。
In a filter press in which a stock solution is pressed into a filtration chamber (9) formed by a number of filter plates (4) and a diaphragm filter plate (5) to produce a dewatered cake,
At least one of the diaphragm filter plates (5) is a pressure filter plate (6),
A compressed air pipe (15) for supplying compressed air to a diaphragm chamber (12, 12a) formed in the diaphragm filter plate (5) and the pressure filter plate (6), and a pressure water supply pipe (14) for supplying pressurized water. Connect and
A pressure tank integrated filter press, characterized in that a stock solution supply pipe (26) is communicated only with a filtration chamber (9) formed between a filter plate (4) and a diaphragm filter plate (5).
前記圧力ろ板(6)のダイアフラム室(12a)の容積は、他のダイアフラムろ板(5)のダイアフラム室(12)の合計容積の1/50〜1/20である
ことを特徴とする請求項5に記載の圧力タンク一体型フィルタープレス。
The volume of the diaphragm chamber (12a) of the pressure filter plate (6) is 1/50 to 1/20 of the total volume of the diaphragm chambers (12) of the other diaphragm filter plates (5). Item 6. A filter press integrated with a pressure tank according to Item 5.
前記ろ過室(9)からろ液を排出する排出管(22)に流量計(23)を備えると共に、
流量計(23)が測定したろ液流量を基にろ過室(9)内の脱水ケーキの厚みを算出し、
脱水ケーキの厚みがろ過室(9)の厚みの1/4〜2/3幅となった場合、
圧縮空気管(15)の圧縮空気弁(21)と圧力水供給管(14)の圧力水弁(21)を切り替える制御盤(24)と、
を備えることを特徴とする請求項5又は6に記載の圧力タンク一体型フィルタープレス。
A discharge pipe (22) for discharging a filtrate from the filtration chamber (9) is provided with a flow meter (23),
The thickness of the dehydrated cake in the filtration chamber (9) is calculated based on the filtrate flow rate measured by the flow meter (23),
When the thickness of the dewatered cake is 1/4 to 2/3 of the thickness of the filtration chamber (9),
A control panel (24) for switching between a compressed air valve (21) of a compressed air pipe (15) and a pressure water valve (21) of a pressure water supply pipe (14);
The pressure press integrated with a pressure tank according to claim 5 or 6, further comprising:
前記圧力ろ板(6)はろ板(4)とダイアフラムろ板(5)の一端に配置し、圧力ろ板(6)に張設するダイアフラム(6a)は薄膜のゴムである
ことを特徴とする請求項5乃至請求項7の何れか一項に記載の圧力タンク一体型フィルタープレス。
The pressure filter plate (6) is disposed at one end of the filter plate (4) and one end of the diaphragm filter plate (5), and the diaphragm (6a) stretched over the pressure filter plate (6) is a thin film rubber. The filter press integrated with a pressure tank according to any one of claims 5 to 7.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116212469A (en) * 2023-05-05 2023-06-06 唐山沃德恒利物流有限公司 Filter press and method for concentrating iron concentrate tailings

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JPS57107206A (en) * 1980-12-24 1982-07-03 Kubota Ltd Method for sludge dehydration with pressure dehydrator
JPS6115711A (en) * 1984-06-29 1986-01-23 Ishigaki Kiko Kk Water draining method of diaphragm in filter press
WO2003057344A1 (en) * 2002-01-08 2003-07-17 Larox Oyj Method and apparatus for controlling the forming of a cake in a filter press
JP4911369B2 (en) * 2008-07-25 2012-04-04 株式会社石垣 Filter press with built-in large capacity diaphragm
JP2018126740A (en) * 2018-04-13 2018-08-16 株式会社クボタ Filter press dehydration device and operational method for filter press dehydration device

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JPS57107206A (en) * 1980-12-24 1982-07-03 Kubota Ltd Method for sludge dehydration with pressure dehydrator
JPS6115711A (en) * 1984-06-29 1986-01-23 Ishigaki Kiko Kk Water draining method of diaphragm in filter press
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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