JP3969900B2

JP3969900B2 - Sludge sample supply method and sludge sample supply apparatus

Info

Publication number: JP3969900B2
Application number: JP20237699A
Authority: JP
Inventors: 和男長▲濱▼; 武志杉澤; 寛通安東; 正矢野; 誠黒田
Original assignee: Kubota Corp
Current assignee: Kubota Corp
Priority date: 1999-07-16
Filing date: 1999-07-16
Publication date: 2007-09-05
Anticipated expiration: 2019-07-16
Also published as: JP2001033361A

Description

【０００１】
【発明の属する技術分野】
本発明は、汚泥含水率や強熱減量の計測技術に係り、汚泥試料を採取するための汚泥試料の供給方法および汚泥試料供給装置に関する。
【０００２】
【従来の技術】
近年、下水処理施設では、汚泥の効率的処分を目的として広域汚泥処理を採用する傾向にある。しかし、搬入される汚泥性状は時間変動を生じ易く、焼却、溶融処理プラントの安定運転に影響を及ぼしている。このような、処理プラントにおいて汚泥の含水率、強熱減量を事前に計測することは、プラントの安定運転を行なうために重要である。
【０００３】
この測定は、日本下水道協会が定める試験方法に基づいて行なっている。水分は、汚泥試料を１０５〜１１０℃で２時間乾燥し、経過後の全蒸発残留物の重量を測定し、乾燥前の汚泥試料の重量との差を算出する。強熱減量は、含水率計測後の全蒸発残留物を６００±２５℃で１時間強熱灰化し、経過後の強熱残留物の重量を測定し、全蒸発残留物の重量との差を算出する。
【０００４】
従来の汚泥含水率や強熱減量の計測装置においては、汚泥試料を試料皿に採取し、加熱計量室内おいて乾燥もしくは強熱灰化し、汚泥試料の各段階における重量を測定している。
【０００５】
【発明が解決しようとする課題】
上記した従来の計測装置における汚泥試料の採取は、汚泥を定量供給ポンプで供給ノズルに送り、定量供給ポンプの運転時間を制御することにより所定量の汚泥を試料皿に汚泥試料として切り出している。汚泥はその性状が常に一様ではなく、その変動は５ｇ程度の微小量の汚泥試料を採取する場合に採取量の精度に大きな影響を与える。このため、定量供給ポンプの運転時間を採取した汚泥試料の重量の変動に応じて調整している。
【０００６】
しかし、この手法においては、採取した汚泥試料の重量から汚泥性状の変化を事後的に評価して次の切り出し量を調整するものであるため、今回において実際に採取する汚泥の性状を正確に把握することはできず、前回採取時との汚泥性状の変化が採取量のばらつきとなって表われる。
また、汚泥はときに異物等を含むものである。このような汚泥を定量供給ポンプで供給する場合に、異物が定量供給ポンプの運転を阻害すると、所定量の汚泥を正確に切り出すことができないので、異物の詰まり時もしくは定期的に清掃メンテナンスを行なう必要がある。
【０００７】
本発明は上記した課題を解決するものであり、採取する汚泥の性状の変化を事前に検知して採取量の精度を高めるとともに、異物を含む汚泥であっても正確に所定量の汚泥を切り出すことができる汚泥試料の供給方法および汚泥試料供給装置を提供することを目的とする。
【０００８】
【課題解決するための手段】
上記した課題を解決するために、請求項１に係る本発明の汚泥試料の供給方法は、汚泥供給系の途中に介装した給泥バルブを設定開放時間ｔ₁だけ開栓して、汚泥供給系に接続した供給ノズルに設定採取用量の汚泥を供給し、給泥バルブを閉栓した後に設定経過時間ｔ₂を経た時点で、供給ノズルに接続した圧縮空気供給系の給気バルブを開栓して、供給ノズル内の汚泥を圧縮空気で押し出して汚泥試料を採取し、採取した汚泥試料の重量Ｗを計測手段で計測する供給方法において、
汚泥採取に先立って、汚泥性状の変化に伴って変動する汚泥供給系の送泥圧力を計測し、計測した圧力下において設定採取用量の汚泥を採取するに必要な給泥バルブの必要開放時間を、予め求めた送泥圧力と必要開放時間との相関に基づいて算出し、算出した必要開放時間を給泥バルブの設定開放時間ｔ₁に設定し、
前回採取時における設定経過時間ｔｐ、計測手段で計測した前回の汚泥試料の重量Ｗ、汚泥試料の目標重量Ｗｒ、補正係数Ｃを次式に代入し、
ｔ＝ｔｐ−（Ｗ−Ｗｒ）×Ｃ
算出するｔの値を設定経過時間ｔ₂に設定する構成としたものである。
【０００９】
上記した構成により、汚泥採取に先立って汚泥性状の変化を送泥圧力の変動として事前に評価し、送泥圧力の変化に応じて給泥バルブの設定開放時間ｔ₁を調整することにより、汚泥性状の変化に伴って増減する圧力損失、および圧力損失の増減に起因する流量の変化に影響されることがなくなり、汚泥の採取用量がばらつきのない安定したものになる。
【００１０】
請求項２に係る本発明の汚泥試料供給装置は、汚泥を圧送する汚泥供給系と、汚泥供給系の途中に介装した給泥バルブと、汚泥供給系の先端に接続し、ノズル口が下方に向けて開口する供給ノズルと、供給ノズルの頂部側に接続する圧縮空気供給系と、圧縮空気供給系の途中に介装した給気バルブと、供給ノズルの上流側における汚泥供給系の送泥圧力を計測する圧力計と、圧力計の信号を受信し、給泥バルブおよび給気バルブを開閉制御する制御手段とを備え、
制御手段は、汚泥採取に先立って、圧力計で計測する圧力値を指標として、汚泥性状の変化に由来して変動する送泥圧力下での設定採取用量の汚泥を採取するに必要な給泥バルブの必要開放時間を、予め求めた送泥圧力と必要開放時間との相関に基づいて算出し、算出した必要開放時間を給泥バルブの設定開放時間ｔ₁に設定し、汚泥採取時に、給泥バルブを設定開放時間ｔ₁だけ開栓し、給泥バルブを閉栓した後に設定経過時間ｔ₂を経た時点で、給気バルブを開栓する機能回路を有する構成としたものである。
【００１１】
上記した構成により、制御手段は、汚泥試料を採取する操作サイクルの始めにおいて、給泥バルブを開栓して汚泥供給系および供給ノズル内に残留する汚泥を廃棄し、汚泥供給系から供給する汚泥を供給ノズルから連続的に排出している。採取対象の新たな汚泥を汚泥供給系および供給ノズル内に導く。
この汚泥の廃棄操作の終了直前において、圧力計で汚泥供給系の送泥圧力を計測して記憶する。給泥バルブを閉栓して汚泥の供給を停止し、給気バルブを開栓して圧縮空気供給系から圧縮空気を供給ノズルに供給する。この圧縮空気は供給ノズルの頂部側に作用し、供給ノズル内に残留する汚泥をノズル外へ押し出して除去するととも、ノズル内を洗浄する。
【００１２】
制御装置は、先に計測した圧力下において設定採取用量の汚泥を採取するに必要な給泥バルブの必要開放時間を、予め求めた送泥圧力と必要開放時間との相関に基づいて算出し、算出した必要開放時間を給泥バルブの設定開放時間ｔ₁に設定する。
次に、汚泥供給系の途中に介装した給泥バルブを設定開放時間ｔ₁だけ開栓して、汚泥供給系に接続した供給ノズルに設定採取用量の汚泥を供給する。給泥バルブを閉栓した後に設定経過時間ｔ₂を経た時点で、供給ノズルに接続した圧縮空気供給系の給気バルブを開栓して、供給ノズル内の汚泥を圧縮空気で押し出して汚泥試料を採取する。
【００１３】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づいて説明する。図１において、計測装置１は計測装置本体２と計測制御盤３とからなり、計測装置本体２は汚泥採取室４、加熱計量室５、電子天秤室６、廃棄室７に区画してそれぞれ閉塞空間を形成している。
【００１４】
電子天秤室６には計測機器として電子天秤８を配置し、電子天秤８の天秤皿９を加熱計量室５の内部に配置し、この天秤皿９に汚泥試料１０を採取する試料皿１１を載置している。加熱計量室５は、上部に熱源としてのハロゲンランプ装置１２を配置し、側壁面上部に脱臭ファン１３を設けており、一側の壁面に形成した開口５ａを開閉する扉装置１４を有している。
【００１５】
汚泥採取室４には、試料皿１１をハンドリングするためのロボットハンド１５を配置するとともにと、汚泥試料１０を供給する汚泥供給系１６と、計測後の残留物を吸引除去する吸引系１７と、汚泥供給系１６に残る余剰な汚泥を投棄する排水系１８とがそれぞれ開口している。
汚泥供給系１６は、基端側が汚泥を溶融炉等へ供給する送泥本管（図示省略）に連通し、途中に給泥バルブ１９を有し、先端に供給ノズル２０を接続している。図２に示すように、供給ノズル２０は、流量制御の精度を高めるために、汚泥供給系１６より小さい流路径を有し、ノズル口２０ａを有する先端部２０ｂが下方に向けて屈曲している。
【００１６】
汚泥供給系１６の途中には、汚泥性状の変化に由来して変動する送泥圧力を検出する圧力計２１を設けており、圧力計２１は後述するパーソナルコンピュータ２９に接続している。供給ノズル２０には先端部２０ｂの頂部側に圧縮空気を供給する圧縮空気供給系２２が給気バルブ２２ａを介して接続しており、給泥バルブ１９および給気バルブ２２ａはパーソナルコンピュータ２９の指示によって開閉動作する。
【００１７】
吸引系１７は廃棄室７に配置した吸引ブロア２３および集灰缶２４を有し、排水系１８は廃棄室７に配置した攪拌槽２５および排水ポンプ２６を有している。
これらの機器を制御する計測制御盤３は、ハロゲンランプ装置１２の出力を制御するランプコントローラ２７と、ランプコントローラ２７への指示量を調節する指示調節計２８と、パーソナルコンピュータ２９からなり、パーソナルコンピュータ２９は、圧力計２１、加熱計量室５に配置した温度センサー３０および電子天秤８からの出力を受け取り、給泥バルブ１９、給気バルブ２２ａ等の各機器を制御して計測操作を行なう。
【００１８】
以下、上記した構成における作用を説明する。試料に供する汚泥は、焼却、溶融処理プラントへ汚泥を供給する本管（図示省略）から汚泥供給系１６を通して取り出す。
図３に示すように、パーソナルコンピュータ２９は、汚泥試料を採取する操作サイクルの始めにおいて、給泥バルブ１９を開栓して現在において本管を流れる汚泥と同質の新たな汚泥をリアルタイムに取り込んで、汚泥供給系１６および供給ノズル２０に導くとともに、汚泥供給系１６および供給ノズル２０内に残留する汚泥を廃棄し、廃棄汚泥を排水系１８に投入する。
【００１９】
この汚泥の廃棄操作の終了直前において、圧力計２１で汚泥供給系１６の送泥圧力を計測して記憶する。給泥バルブ１９を閉栓して汚泥の供給を一旦停止し、給気バルブ２２ａを開栓して圧縮空気供給系２２から圧縮空気を供給ノズル２０の先端部２０ｂに供給する。この圧縮空気は供給ノズル２０の頂部側に作用し、供給ノズル２０に残留する汚泥をノズル外へ押し出して除去するととも、ノズル内を洗浄する。
【００２０】
パーソナルコンピュータ２９は、先に計測した圧力下において設定採取用量の汚泥を採取するに必要な給泥バルブ１９の必要開放時間を、予め求めた送泥圧力と必要開放時間との相関に基づいて算出し、算出した必要開放時間を給泥バルブ１９の設定開放時間ｔ₁に設定する。また、前回採取時における設定経過時間ｔｐ、計測手段で計測した前回の汚泥試料の重量Ｗ、汚泥試料の目標重量Ｗｒ、補正係数Ｃを次式に代入し、
ｔ＝ｔｐ−（Ｗ−Ｗｒ）×Ｃ
算出するｔの値を設定経過時間ｔ₂に設定する。
【００２１】
計測操作の１サイクルの初期状態において試料皿１１は電子天秤室６の天秤皿９の上にある。パーソナルコンピュータ２９は、加熱計量室５の扉装置１４を開放し、ロボットハンド１５を操作して試料皿１１を採取位置へ移動する。
次に、汚泥供給系１６の途中に介装した給泥バルブ１９を設定開放時間ｔ₁だけ開栓して、汚泥供給系１６に接続した供給ノズル２０に設定採取用量の汚泥を供給する。給泥バルブ１９を閉栓した後に設定経過時間ｔ₂を経た時点で、供給ノズル２０に接続した圧縮空気供給系２２の給気バルブ２２ａを開栓して、供給ノズル２０の先端部２０ｂの汚泥を圧縮空気で押し出して汚泥試料を試料皿１１に切り出す。
【００２２】
給泥バルブ１９を閉栓した後に管内に残圧がない場合には設定開放時間ｔ₁の調整により設定採取用量の汚泥試料を取り出せるが、実際には管内の残圧によって給泥バルブ１９を閉栓した後にも供給ノズル２０の先端部２０ｂに汚泥が流れ出る。しかし、設定経過時間ｔ₂を調整することにより、残圧による影響を抑制して目標重量の汚泥試料を取り出すことができる。
【００２３】
次に、扉装置１４を開放し、汚泥試料１０を採取した試料皿１１をロボットハンド１５で天秤皿９に載置し、扉装置１４を閉じて電子天秤８で採取した汚泥試料の重量を計測し、計測した値を記憶する。ランプコントローラ２７はハロゲンランプ装置１２を所定の出力で点灯し、汚泥試料１０を設定温度（１０５〜１１０℃）に加熱し、汚泥試料１０を乾燥させる。乾燥工程の終了時における電子天秤８による計測重量を蒸発残留物の重量として記憶する。
【００２４】
次に、指示調節計２８によりハロゲンランプ装置１２の出力を増し、試料皿１１に残る蒸発残留物を設定温度（６００±２５℃）に加熱し、汚泥試料１０を強熱灰化する。強熱灰化工程の終了時における電子天秤８による計測重量を強熱残留物の重量として記憶し、強熱減量を算出する。
次に、ロボットハンド１５により試料皿１１を加熱計量室５から取り出し、試料皿１１を廃棄位置で吸引系１７に対応させる。吸引ブロア２３を駆動して試料皿１１の強熱残留物を吸引除去し、吸引した灰を集灰缶２４に貯留する。加熱計量室５の扉装置１４を開放し、ロボットハンド１５により試料皿１１を天秤皿の計測位置に戻す。その後、脱臭ファン１３による加熱計量室５の空気を排気することにより加熱計量室５および試料皿１１を冷却し、初期状態に復帰する。
【００２５】
【発明の効果】
以上のように本発明によれば、汚泥採取に先立って汚泥性状の変化を送泥圧力の変動として事前に評価し、送泥圧力の変化に応じて給泥バルブの設定開放時間ｔ₁を調整するので、汚泥性状の変化に伴って増減する圧力損失、および圧力損失の増減に起因する流量の変化に影響されることがなくなり、汚泥の採取用量がばらつきのない安定したものになる。また、設定経過時間ｔ₂を調整することにより、残圧による影響を抑制して目標重量の汚泥試料を取り出すことができる。
【図面の簡単な説明】
【図１】本発明の実施の形態を示す計測装置の摸式図である。
【図２】同計測装置の汚泥試料供給装置の摸式図である。
【図３】同供給装置の作用を示すフロートチャートである。
【符号の説明】
１計測装置
８電子天秤
９天秤皿
１０汚泥試料
１１試料皿
１６汚泥供給系
１９給泥バルブ
２０供給ノズル
２０ａノズル口
２０ｂ先端部
２１圧力計
２２圧縮空気供給系
２２ａ給気バルブ
２９パーソナルコンピュータ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a measurement technique of sludge moisture content and ignition loss, and relates to a sludge sample supply method and a sludge sample supply apparatus for collecting a sludge sample.
[0002]
[Prior art]
In recent years, sewage treatment facilities tend to employ wide-area sludge treatment for the purpose of efficient disposal of sludge. However, the sludge properties that are carried in easily change over time and affect the stable operation of the incineration and melting treatment plants. Measuring the moisture content of the sludge and the loss on ignition in advance in such a treatment plant is important for stable operation of the plant.
[0003]
This measurement is performed based on a test method defined by the Japan Sewerage Association. For moisture, the sludge sample is dried at 105 to 110 ° C. for 2 hours, the weight of the total evaporation residue after the lapse is measured, and the difference from the weight of the sludge sample before drying is calculated. For ignition loss, the total evaporation residue after moisture content measurement is ashed at 600 ± 25 ° C for 1 hour, and the weight of the ignition residue after the lapse of time is measured, and the difference from the weight of the total evaporation residue is calculated. calculate.
[0004]
In a conventional measuring device for sludge moisture content or loss on ignition, a sludge sample is collected in a sample pan, dried or ashed in a heating and weighing chamber, and the weight of each sludge sample is measured.
[0005]
[Problems to be solved by the invention]
In collecting the sludge sample in the conventional measuring apparatus described above, a predetermined amount of sludge is cut out as a sludge sample in a sample dish by sending the sludge to a supply nozzle with a quantitative supply pump and controlling the operation time of the quantitative supply pump. The properties of sludge are not always uniform, and the fluctuation greatly affects the accuracy of the collected amount when a minute amount of sludge sample of about 5 g is collected. For this reason, the operation time of the fixed supply pump is adjusted according to the fluctuation of the weight of the sludge sample collected.
[0006]
However, in this method, the change of the sludge property is evaluated afterwards from the weight of the collected sludge sample, and the next cutout amount is adjusted, so the property of the sludge actually collected this time is accurately grasped. It cannot be done, and the change in the sludge properties from the previous collection appears as a variation in the collection amount.
Moreover, the sludge sometimes contains foreign substances. When supplying such sludge with a metering pump, if the foreign matter hinders the operation of the metering pump, a predetermined amount of sludge cannot be cut out accurately, so cleaning is performed regularly when clogged with foreign matter. There is a need.
[0007]
The present invention solves the above-described problem, and detects the change in the properties of the collected sludge in advance to improve the accuracy of the collected amount, and accurately cuts out a predetermined amount of sludge even if it is sludge containing foreign matter. It is an object to provide a sludge sample supply method and a sludge sample supply apparatus.
[0008]
[Means for solving the problems]
In order to solve the above-described problem, the sludge sample supply method of the present invention according to claim 1 is configured to supply a sludge by opening a mud supply valve interposed in the middle of the sludge supply system for a set open time t _1. supplying sludge settings taken dose supply nozzle connected to the system, when passing through the set elapsed time t ₂ after plugging the sludge feeding valve, and unplugging the air supply valve of the compressed air supply system which is connected to the supply nozzle In the supply method in which the sludge in the supply nozzle is extruded with compressed air to collect a sludge sample, and the weight W of the collected sludge sample is measured by the measuring means,
Prior to the collection of sludge, measure the sludge supply pressure of the sludge supply system that fluctuates with changes in sludge properties, and set the required opening time of the mud supply valve necessary to collect the set sampling amount of sludge under the measured pressure. , Calculated based on the correlation between the previously determined mud feed pressure and the required opening time, set the calculated required opening time to the set opening time t ₁ of the mud supply valve,
Substituting the set elapsed time tp at the time of the previous collection, the previous sludge sample weight W measured by the measuring means, the sludge sample target weight Wr, and the correction coefficient C into the following equation:
t = tp− (W−Wr) × C
It is obtained by a configuration that sets the value of calculation for t to set the elapsed time t _2.
[0009]
With the configuration described above, by prior to the sludge collected to evaluate changes in sludge properties in advance as variations in Okudoro pressure, adjusts the set opening time t ₁ of sludge feeding valve in response to changes in Okudoro pressure, sludge It is no longer affected by the pressure loss that increases or decreases with the change of properties, and the change of the flow rate due to the increase or decrease of the pressure loss, and the collected amount of sludge becomes stable without variation.
[0010]
The sludge sample supply device of the present invention according to claim 2 is connected to a sludge supply system for pumping sludge, a mud supply valve interposed in the middle of the sludge supply system, and a tip of the sludge supply system, and the nozzle port is downward A supply nozzle that opens toward the top, a compressed air supply system that is connected to the top side of the supply nozzle, an air supply valve that is provided in the middle of the compressed air supply system, and a sludge supply system that is upstream of the supply nozzle. A pressure gauge for measuring pressure, and a control means for receiving a pressure gauge signal and controlling opening and closing of the mud supply valve and the air supply valve,
Prior to the collection of sludge, the control means uses the pressure value measured by the pressure gauge as an index, and supplies the sludge necessary to collect the sludge at the set sampling rate under varying sludge pressure derived from changes in sludge properties. The required opening time of the valve is calculated based on the correlation between the previously determined mud feed pressure and the required opening time, and the calculated required opening time is set as the set opening time t ₁ of the mud supply valve. The mud valve is opened for a set opening time t ₁ , and the functional circuit for opening the air supply valve is opened when the set elapsed time t ₂ elapses after the mud valve is closed.
[0011]
With the above configuration, the control means opens the sludge valve at the beginning of the operation cycle for collecting the sludge sample, discards the sludge remaining in the sludge supply system and supply nozzle, and supplies the sludge supplied from the sludge supply system. Is continuously discharged from the supply nozzle. New sludge to be collected is introduced into the sludge supply system and supply nozzle.
Immediately before the end of the sludge disposal operation, the sludge supply system measures and stores the sludge supply pressure with a pressure gauge. The mud supply valve is closed to stop the supply of sludge, and the air supply valve is opened to supply compressed air from the compressed air supply system to the supply nozzle. This compressed air acts on the top side of the supply nozzle to push out and remove the sludge remaining in the supply nozzle and to clean the inside of the nozzle.
[0012]
The control device calculates the necessary opening time of the mud supply valve necessary to collect the set sampling dose of sludge under the previously measured pressure based on the correlation between the previously determined mud pressure and the required opening time, The calculated required opening time is set to the setting opening time t ₁ of the mud supply valve.
Next, the mud supply valve interposed in the middle of the sludge supply system is opened for the set opening time t _1, and the set sampling dose of sludge is supplied to the supply nozzle connected to the sludge supply system. The sludge feeding valve when the set elapsed time after the t ₂ after plugging, and unplugging the air supply valve of the compressed air supply system which is connected to the supply nozzle, the sludge sample extruding the sludge in the supply nozzle with compressed air Collect.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, the measuring device 1 includes a measuring device main body 2 and a measurement control panel 3, and the measuring device main body 2 is partitioned into a sludge collection chamber 4, a heating and weighing chamber 5, an electronic balance chamber 6, and a disposal chamber 7. A space is formed.
[0014]
An electronic balance 8 is arranged as a measuring device in the electronic balance chamber 6, a balance pan 9 of the electronic balance 8 is placed inside the heating weighing chamber 5, and a sample pan 11 for collecting a sludge sample 10 is placed on the balance pan 9. It is location. The heating metering chamber 5 has a halogen lamp device 12 as a heat source at the top, a deodorizing fan 13 at the top of the side wall surface, and a door device 14 for opening and closing an opening 5a formed on one side wall surface. Yes.
[0015]
In the sludge collection chamber 4, a robot hand 15 for handling the sample dish 11 is disposed, a sludge supply system 16 for supplying the sludge sample 10, a suction system 17 for sucking and removing the residue after measurement, A drainage system 18 for dumping excess sludge remaining in the sludge supply system 16 is opened.
The sludge supply system 16 communicates with a feed mud main pipe (not shown) for supplying sludge to a melting furnace or the like at the base end side, has a mud supply valve 19 in the middle, and connects a supply nozzle 20 to the tip. As shown in FIG. 2, the supply nozzle 20 has a flow path diameter smaller than the sludge supply system 16 and has a tip portion 20 b having a nozzle port 20 a bent downward to increase the accuracy of flow control. .
[0016]
In the middle of the sludge supply system 16, there is provided a pressure gauge 21 that detects a mud supply pressure that fluctuates due to changes in sludge properties, and the pressure gauge 21 is connected to a personal computer 29 described later. The supply nozzle 20 is connected with a compressed air supply system 22 for supplying compressed air to the top side of the tip 20b through an air supply valve 22a. The mud supply valve 19 and the air supply valve 22a are instructed by a personal computer 29. Opens and closes.
[0017]
The suction system 17 has a suction blower 23 and an ash collecting can 24 disposed in the disposal chamber 7, and the drainage system 18 has a stirring tank 25 and a drainage pump 26 disposed in the disposal chamber 7.
The measurement control panel 3 that controls these devices includes a lamp controller 27 that controls the output of the halogen lamp device 12, an instruction controller 28 that adjusts an instruction amount to the lamp controller 27, and a personal computer 29. 29 receives the output from the pressure gauge 21, the temperature sensor 30 disposed in the heating and metering chamber 5, and the electronic balance 8, and controls each device such as the mud supply valve 19 and the air supply valve 22a to perform the measurement operation.
[0018]
Hereinafter, the operation of the above-described configuration will be described. The sludge used for the sample is taken out through a sludge supply system 16 from a main pipe (not shown) that supplies the sludge to the incineration and melting treatment plant.
As shown in FIG. 3, the personal computer 29 opens the mud supply valve 19 at the beginning of an operation cycle for collecting a sludge sample, and takes in new sludge of the same quality as the sludge currently flowing through the main pipe in real time. The sludge is led to the sludge supply system 16 and the supply nozzle 20, the sludge remaining in the sludge supply system 16 and the supply nozzle 20 is discarded, and the discarded sludge is thrown into the drainage system 18.
[0019]
Immediately before the end of the sludge disposal operation, the pressure gauge 21 measures and stores the sludge supply pressure of the sludge supply system 16. The mud supply valve 19 is closed to temporarily stop the supply of sludge, the air supply valve 22a is opened, and the compressed air is supplied from the compressed air supply system 22 to the tip 20b of the supply nozzle 20. The compressed air acts on the top side of the supply nozzle 20 to extrude and remove sludge remaining in the supply nozzle 20 and to clean the inside of the nozzle.
[0020]
The personal computer 29 calculates the necessary opening time of the mud supply valve 19 necessary for collecting the set collection dose of sludge under the previously measured pressure based on the correlation between the previously determined mud supply pressure and the necessary opening time. Then, the calculated required opening time is set to the set opening time t ₁ of the mud supply valve 19. Further, the set elapsed time tp at the time of the previous collection, the weight W of the previous sludge sample measured by the measuring means, the target weight Wr of the sludge sample, and the correction coefficient C are substituted into the following equation:
t = tp− (W−Wr) × C
To set the value of the calculation to t to set the elapsed time t _2.
[0021]
In the initial state of one cycle of the measurement operation, the sample pan 11 is on the balance pan 9 in the electronic balance chamber 6. The personal computer 29 opens the door device 14 of the heating and weighing chamber 5 and operates the robot hand 15 to move the sample dish 11 to the collection position.
Next, the mud supply valve 19 provided in the middle of the sludge supply system 16 is opened for the set opening time t _1, and the set sampling dose of sludge is supplied to the supply nozzle 20 connected to the sludge supply system 16. When the set elapsed time t ₂ has elapsed after closing the mud supply valve 19, the air supply valve 22 a of the compressed air supply system 22 connected to the supply nozzle 20 is opened, and the sludge at the tip 20 b of the supply nozzle 20 is removed. The sludge sample is cut out into the sample pan 11 by extruding with compressed air.
[0022]
The sludge feeding valve 19 when there is no residual pressure in the tube after plugging the retrieve sludge sample set taken dose by adjusting the set opening time t _1, but actually has stoppered the sludge feeding valve 19 by the residual pressure in the tube Later, sludge flows out to the tip 20b of the supply nozzle 20. However, by adjusting the set elapsed time t _2, it is possible to suppress the effect of residual pressure taking out target weight of the sludge samples.
[0023]
Next, the door device 14 is opened, the sample pan 11 from which the sludge sample 10 has been collected is placed on the balance pan 9 by the robot hand 15, the door device 14 is closed, and the weight of the sludge sample collected by the electronic balance 8 is measured. And memorize the measured value. The lamp controller 27 lights the halogen lamp device 12 with a predetermined output, heats the sludge sample 10 to a set temperature (105 to 110 ° C.), and dries the sludge sample 10. The weight measured by the electronic balance 8 at the end of the drying process is stored as the weight of the evaporation residue.
[0024]
Next, the output of the halogen lamp device 12 is increased by the indicating controller 28, the evaporation residue remaining in the sample pan 11 is heated to a set temperature (600 ± 25 ° C.), and the sludge sample 10 is ashed. The weight measured by the electronic balance 8 at the end of the ignition ashing process is stored as the weight of the ignition residue, and the ignition loss is calculated.
Next, the sample pan 11 is taken out from the heating and weighing chamber 5 by the robot hand 15, and the sample pan 11 is made to correspond to the suction system 17 at the disposal position. The suction blower 23 is driven to remove the ignition residue on the sample dish 11 and the sucked ash is stored in the ash collecting can 24. The door device 14 of the heating and weighing chamber 5 is opened, and the sample pan 11 is returned to the measuring position of the balance pan by the robot hand 15. Thereafter, the air in the heating and measuring chamber 5 is exhausted by the deodorizing fan 13 to cool the heating and measuring chamber 5 and the sample pan 11 and return to the initial state.
[0025]
【The invention's effect】
As described above, according to the present invention, prior to the collection of sludge, the change in sludge properties is evaluated in advance as the fluctuation in the mud supply pressure, and the set opening time t ₁ of the mud supply valve is adjusted according to the change in the mud supply pressure. Therefore, it is not affected by the pressure loss that increases or decreases with the change of sludge properties, and the change of the flow rate due to the increase or decrease of the pressure loss, and the collected amount of sludge becomes stable without variation. Further, by adjusting the set elapsed time t _2, it is possible to suppress the effect of residual pressure taking out target weight of the sludge samples.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a measuring apparatus showing an embodiment of the present invention.
FIG. 2 is a schematic diagram of a sludge sample supply device of the measurement device.
FIG. 3 is a float chart showing the operation of the supply device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Measuring apparatus 8 Electronic balance 9 Balance pan 10 Sludge sample 11 Sample tray 16 Sludge supply system 19 Sludge supply valve 20 Supply nozzle 20a Nozzle port 20b Tip part 21 Pressure gauge 22 Compressed air supply system 22a Supply valve 29 Personal computer

Claims

Set after the mud supply valve installed in the middle of the sludge supply system is opened for the set open time t ₁ , the set sampling amount of sludge is supplied to the supply nozzle connected to the sludge supply system, and the mud supply valve is closed. When the elapsed time t ₂ has elapsed, the air supply valve of the compressed air supply system connected to the supply nozzle is opened, the sludge in the supply nozzle is pushed out with compressed air, and a sludge sample is collected. In the supply method of measuring the weight W by the measuring means,
Prior to the collection of sludge, measure the sludge supply pressure of the sludge supply system that fluctuates with changes in sludge properties, and set the required opening time of the mud supply valve necessary to collect the set sampling amount of sludge under the measured pressure. , Calculated based on the correlation between the previously determined mud feed pressure and the required opening time, set the calculated required opening time to the set opening time t ₁ of the mud supply valve,
Substituting the set elapsed time tp at the time of the previous collection, the previous sludge sample weight W measured by the measuring means, the sludge sample target weight Wr, and the correction coefficient C into the following equation:
t = tp− (W−Wr) × C
Method for supplying sludge samples and sets the value of calculation for t to set the elapsed time t _2.

Sludge supply system that pumps sludge, a mud supply valve interposed in the middle of the sludge supply system, a supply nozzle that is connected to the tip of the sludge supply system, and the nozzle port opens downward, and the top side of the supply nozzle Compressed air supply system connected to the air supply system, an air supply valve interposed in the middle of the compressed air supply system, a pressure gauge for measuring the sludge supply system in the upstream of the supply nozzle, and a pressure gauge signal received And a control means for controlling opening and closing of the mud supply valve and the air supply valve,
Prior to the collection of sludge, the control means uses the pressure value measured by the pressure gauge as an index, and supplies the sludge necessary to collect the sludge at the set sampling rate under varying sludge pressure derived from changes in sludge properties. The required opening time of the valve is calculated based on the correlation between the previously determined mud feed pressure and the required opening time, and the calculated required opening time is set as the set opening time t ₁ of the mud supply valve. the mud valve and cap removal by setting the opening time t _1, when passing through the set elapsed time t ₂ after plugging the sludge feeding valve, sludge sample supply apparatus characterized by having a function circuit for unplugging the air supply valve .