JPH0711147Y2 - Urea solution manufacturing equipment - Google Patents
Urea solution manufacturing equipmentInfo
- Publication number
- JPH0711147Y2 JPH0711147Y2 JP4452790U JP4452790U JPH0711147Y2 JP H0711147 Y2 JPH0711147 Y2 JP H0711147Y2 JP 4452790 U JP4452790 U JP 4452790U JP 4452790 U JP4452790 U JP 4452790U JP H0711147 Y2 JPH0711147 Y2 JP H0711147Y2
- Authority
- JP
- Japan
- Prior art keywords
- water
- urea
- solution
- solution tank
- tank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Description
【考案の詳細な説明】 〔産業上の利用分野〕 本考案は、規定濃度の尿素水を連続して製造することの
できる尿素水溶液の製造装置に関するものである。[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an apparatus for producing an aqueous urea solution capable of continuously producing an aqueous urea solution having a specified concentration.
〔従来の技術〕 排ガス中の窒素酸化物を除去する脱硝装置には、還元剤
としてアンモニアを用いるものがある。アンモニアは可
燃性の毒性であり高圧で貯蔵することから、このような
脱硝装置ではアンモニアの管理が難しく、設備上の制約
からアンモニアガスタンク等を設置できないこともあっ
た。[Prior Art] Some denitration devices for removing nitrogen oxides in exhaust gas use ammonia as a reducing agent. Since ammonia is flammable and toxic and is stored at high pressure, it is difficult to manage ammonia with such a denitration device, and it may not be possible to install an ammonia gas tank or the like due to facility restrictions.
このため、アンモニアガス以外の還元剤の研究が進めら
れ、最近では尿素水やアンモニア水が注目されるように
なってきている。特に、尿素は粉体であり、貯蔵が容易
であるが、規定濃度の尿素水溶液を連続して製造する装
置はなかった。そこで通常は、重量を計測した水と尿素
を容器に入れ、これを混合して尿素水溶液を製造してい
た。For this reason, research on reducing agents other than ammonia gas has been promoted, and urea water and ammonia water have recently attracted attention. In particular, although urea is a powder and is easy to store, there was no apparatus for continuously producing an aqueous urea solution having a specified concentration. Therefore, usually, water and urea, whose weight has been measured, are put in a container and mixed to produce an aqueous urea solution.
尿素には吸湿性があり、水分を容易に吸収するので、測
定した重量は正確ではない。従って、前述の方法で規定
濃度の尿素水溶液を製造するのは実際には困難であっ
た。Urea is hygroscopic and easily absorbs water, so the measured weight is not accurate. Therefore, it was actually difficult to produce the urea solution having the specified concentration by the above method.
本考案は上記の問題点に鑑みてなされたものであり、規
定濃度の尿素水を連続して製造できる製造装置を提供す
ることを目的としている。The present invention has been made in view of the above problems, and an object of the present invention is to provide a manufacturing apparatus capable of continuously manufacturing a urea water having a specified concentration.
本考案の尿素水溶液製造装置は、温度を一定に保つ温度
保持手段を備え、同温度における飽和溶解度の尿素水を
貯える溶液タンクと、水と前記溶液タンクから導いた尿
素水とを混合させる混合部と、前記混合部で所望濃度の
尿素水が製造されるように該混合部に供給される水及び
前記溶液タンクからの尿素水の量を適宜に設定する設定
部とを具備することを特徴としている。The urea aqueous solution manufacturing apparatus of the present invention comprises a temperature holding means for keeping the temperature constant, and a solution tank for storing urea water having a saturated solubility at the same temperature, and a mixing unit for mixing water and the urea water led from the solution tank. And a setting unit that appropriately sets the amount of water supplied to the mixing unit and the amount of urea water from the solution tank so that the mixing unit produces urea water having a desired concentration. There is.
溶液タンクにおいて、温度保持手段で水温を一定に保ち
ながら過剰の尿素を投入して混合すると、同温度におけ
る飽和溶解度の尿素水が得られる。そして、設定部での
設定に応じ、水と前記溶液タンクの尿素水とを適量づつ
混合部に供給し、これによって所望濃度の尿素水溶液を
得る。In the solution tank, when an excessive amount of urea is added and mixed while keeping the water temperature constant by the temperature holding means, urea water having a saturated solubility at the same temperature can be obtained. Then, according to the setting in the setting unit, water and urea water in the solution tank are supplied in appropriate amounts to the mixing unit, whereby a urea aqueous solution having a desired concentration is obtained.
本考案の一実施例を第１図〜第４図によって説明する。 An embodiment of the present invention will be described with reference to FIGS.
第１図に示すように、本実施例は、原動機１に設置され
た脱硝装置としての反応塔２に、還元剤としての尿素水
溶液（以下、尿素水と呼ぶ。）を供給する尿素水製造装
置３（以下、装置３と呼ぶ。）に関するものである。原
動機１との反応塔２の頂部は排気管４で接続連通されて
おり、原動機１からの排気ガスは排気管４を経て反応塔
２の内部に導入されるようになっている。反応塔２の内
部には触媒５が設けられており、導入された排気ガスは
触媒５を通って塔外に排出されるようになっている。As shown in FIG. 1, in the present embodiment, a urea water production apparatus for supplying an aqueous urea solution (hereinafter referred to as urea water) as a reducing agent to a reaction tower 2 as a denitration apparatus installed in a prime mover 1. 3 (hereinafter referred to as device 3). The top of the reaction tower 2 with the prime mover 1 is connected and communicated with an exhaust pipe 4, and the exhaust gas from the prime mover 1 is introduced into the reaction tower 2 through the exhaust pipe 4. A catalyst 5 is provided inside the reaction tower 2, and the introduced exhaust gas passes through the catalyst 5 and is discharged to the outside of the tower.
次に、図中６は、飽和溶解度の尿素水を製造して貯蔵す
る溶液タンクである。この溶液タンク６には、元弁７を
有する本管８から分岐した支管９と、ソレノイド10で操
作される遮断弁11を介して水が供給されるようになって
いる。また、該溶液タンク６には、槽内の溶液を所定の
温度に保つため、温度保持手段として加温ヒータ12が設
けられており、さらに槽内に投入された粉状の尿素を水
に溶解させるため、攪拌装置13も備え付けられている。Next, 6 in the figure is a solution tank for producing and storing urea water having a saturated solubility. Water is supplied to the solution tank 6 through a branch pipe 9 branched from a main pipe 8 having a main valve 7 and a shutoff valve 11 operated by a solenoid 10. Further, the solution tank 6 is provided with a heating heater 12 as a temperature holding means for keeping the solution in the tank at a predetermined temperature, and further dissolves the powdery urea charged in the tank into water. A stirring device 13 is also provided for this purpose.
前記溶液タンク６の底部付近に設けられた吐出口にはセ
ラミックフィルタ14を介してポンプ15が接続されてい
る。該ポンプ15の吐出口には、前記溶液タンク６への戻
り管16を有する流量制御弁17と、ソレノイド18で操作さ
れる遮断弁19と、流量計20とが順次接続されており、混
合部としてのミキサ21の入口に接続連通されている。A pump 15 is connected to a discharge port provided near the bottom of the solution tank 6 via a ceramic filter 14. A flow control valve 17 having a return pipe 16 to the solution tank 6, a shutoff valve 19 operated by a solenoid 18, and a flow meter 20 are sequentially connected to a discharge port of the pump 15, and a mixing section is provided. Is connected and communicated with the inlet of the mixer 21.
次に、図中22は水タンクである。この水タンク22には、
ソレノイド23で操作される遮断弁24と支管25を介して本
管８から水が供給されるようになっている。そして、こ
の水タンク22の底部付近に設けられた吐出口にはポンプ
26が接続されている。該ポンプ26の吐出口には、前記水
タンク22への戻り管27を有する流量制御弁28と、ソレノ
イド29で操作される遮断弁30と、流量計31とが順次接続
されており、前記ミキサ21の入口に接続連通されてい
る。Next, 22 in the figure is a water tank. In this water tank 22,
Water is supplied from the main pipe 8 through a shutoff valve 24 operated by a solenoid 23 and a branch pipe 25. A pump is installed at the discharge port provided near the bottom of the water tank 22.
26 is connected. A flow control valve 28 having a return pipe 27 to the water tank 22, a shutoff valve 30 operated by a solenoid 29, and a flow meter 31 are sequentially connected to the discharge port of the pump 26, and the mixer is It is connected to 21 entrances.
そして、前記ミキサ21の出口は前記排気管４に接続され
ており、飽和溶解度の尿素水と水を混合して得られたあ
る一定の濃度の尿素水を、脱硝反応の還元剤として排気
ガスと共に前記反応塔２内に供給できるようになってい
る。The outlet of the mixer 21 is connected to the exhaust pipe 4, and urea water having a certain constant concentration obtained by mixing urea water having a saturated solubility with water is used as a reducing agent for the denitration reaction together with the exhaust gas. It can be supplied into the reaction tower 2.
次に、図中40は設定部としてのコントローラである。こ
のコントローラ40は、前記反応塔２に供給する尿素水の
濃度を設定し、前述した飽和溶解度の尿素水と水を適宜
に混合する操作を行わせるための装置である。Next, reference numeral 40 in the figure denotes a controller as a setting unit. The controller 40 is a device for setting the concentration of the urea water supplied to the reaction tower 2 and performing an operation of appropriately mixing the urea water having the saturated solubility and water described above.
まず、図中41はNOx分析計であり、コントローラ40に接
続されている。このNOx分析計41は原動機１が排出する
排気ガスに含まれるNOxの濃度を検出する。そしてNOx分
析計41の検出結果に応じ、コントローラ40は脱硝に必要
な尿素水量を算出するように構成されている。First, 41 in the figure is a NO x analyzer, which is connected to the controller 40. The NO x analyzer 41 detects the concentration of NO x contained in the exhaust gas discharged from the prime mover 1. Then, according to the detection result of the NO x analyzer 41, the controller 40 is configured to calculate the amount of urea water necessary for denitration.
次に、このコントローラ40は、前述溶液タンク６及び水
タンク22の流量計20,31から信号を入力されるようにな
っており、さらに各遮断弁11,19,24,30の各ソレノイド1
0,18,23,29及び各流量制御弁17,28をそれぞれ制御でき
るように接続構成されている。そして、コントローラ40
は、算出した脱硝に必要な尿素水量に応じ、飽和溶解度
の尿素水及び水を適当な流量でミキサ21に供給して混合
させるように構成されている。Next, the controller 40 is adapted to receive signals from the flowmeters 20 and 31 of the solution tank 6 and the water tank 22 and further to the solenoids 1 of the shutoff valves 11, 19, 24 and 30.
0, 18, 23, 29 and the flow control valves 17, 28 are connected to each other so as to be controlled. And the controller 40
Is configured to supply urea water having a saturated solubility and water to the mixer 21 at an appropriate flow rate and mix them in accordance with the calculated amount of urea water required for denitration.
次に、以上の構成における作用を説明する。Next, the operation of the above configuration will be described.
まず、元弁７及び遮断弁11,24を開いて溶液タンク６及
び水タンク22に所定量の水を入れる。そして、溶液タン
ク６の水には過剰の尿素を投入し、加温ヒータ12で一定
温度（例えば40℃）に加温制御しながら撹拌装置13で混
合する。第２図に示すように、尿素の飽和溶解度は温度
によって定まり、例えば40℃では38.39wt％となる。そ
して、溶解しない尿素は固体のまま溶液タンク６内の尿
素水中に残る。なお、第２図のフラフの傾きから判るよ
うに、溶液の温度の変化に対する飽和溶解度の変動は比
較的小さいので、加温ヒータ12による温度保持は楽に行
うことができる。First, the main valve 7 and the shutoff valves 11 and 24 are opened to fill a predetermined amount of water into the solution tank 6 and the water tank 22. Then, excess urea is added to the water in the solution tank 6 and mixed with the stirring device 13 while the heating heater 12 controls the heating to a constant temperature (for example, 40 ° C.). As shown in FIG. 2, the saturated solubility of urea is determined by the temperature, and is 38.39 wt% at 40 ° C., for example. Then, the undissolved urea remains in the urea water in the solution tank 6 as a solid. As can be seen from the slope of the fluff in FIG. 2, the change in the saturated solubility with respect to the change in the temperature of the solution is relatively small, so that the temperature can be easily maintained by the heating heater 12.
NOx分岐計41が原動機１の排気ガス中のNOx値を計測し、
これをコントローラ40に送る。コントローラ40は、排気
ガス中のNOxを脱硝するために必要な尿素水量を算出
し、さらにそのような尿素水量を得るために必要な飽和
溶解度の尿素水と水の各流量を算出する。The NO x branch meter 41 measures the NO x value in the exhaust gas of the prime mover 1,
This is sent to the controller 40. The controller 40 calculates the amount of urea water required to denitrate NO x in the exhaust gas, and further calculates the respective flow rates of urea water and water of saturated solubility required to obtain such an amount of urea water.
例えば、脱硝のために30％の尿素水を供給するものと
し、溶液タンク６中の尿素水の飽和溶解度を前述のよう
に38.39wt％とする。この場合には、排気ガス中に供給
する30wt％の尿素水溶液の流量に対して、ミキサ21に供
給すべき38.39wt％の尿素水と水の各流量は、第３図及
び第４図に示すようになる。For example, 30% urea water is supplied for denitration, and the saturated solubility of urea water in the solution tank 6 is 38.39 wt% as described above. In this case, the respective flow rates of 38.39 wt% urea water and water to be supplied to the mixer 21 are shown in FIGS. 3 and 4 with respect to the flow rate of the 30 wt% urea aqueous solution supplied to the exhaust gas. Like
コントローラ40の制御によって各遮断弁19,30及び流量
制御弁17,28が操作され、ミキサ21に所定流量の飽和溶
解度の尿素水と水が送られる。Under the control of the controller 40, the shutoff valves 19 and 30 and the flow rate control valves 17 and 28 are operated, and urea water of saturated solubility and water having a predetermined flow rate are sent to the mixer 21.
即ち、飽和溶解度の尿素水は、溶液タンク６からセラミ
ックフィルタ14を通り、ポンプ15によって流量制御弁1
7、遮断弁19及び流量計20を経てミキサ21へ送られる。
ここで流量制御弁17は、流量計20の検知した流量に基い
てコントローラ40に制御されており、飽和溶解度の尿素
水の一部を溶液タンク６に戻しながら、規定流量となる
ように制御されている。なお、この間の各機器類は、図
示しない保温材及びヒータによって前述した所定温度
（例えば40℃）に保持されている。また、前記水タンク
22の水も、コントローラ40によって同様に流量を制御さ
れている。そして、水と飽和溶解度の尿素水はミキサ21
で混合され、規定濃度及び流量の尿素水となって排気管
４内に噴霧される。That is, the saturated aqueous solution of urea passes from the solution tank 6 through the ceramic filter 14 and is pumped by the pump 15 to the flow control valve 1.
7, sent to the mixer 21 via the shutoff valve 19 and the flow meter 20.
Here, the flow rate control valve 17 is controlled by the controller 40 based on the flow rate detected by the flow meter 20, and is controlled so as to reach a specified flow rate while returning part of the saturated aqueous solution of urea water to the solution tank 6. ing. In addition, each device in the meantime is kept at the above-mentioned predetermined temperature (for example, 40 ° C.) by a heat insulating material and a heater (not shown). Also, the water tank
The flow rate of the water of 22 is also controlled by the controller 40. Then, the water and saturated urea water are mixed in the mixer 21.
Is mixed in the exhaust pipe 4 to form urea water having a specified concentration and flow rate.
以上説明したように本実施例によれば、製造すべき尿素
水の濃度は、混合する水の量や溶液タンク６の加温温度
によって種々に設定することができる。また、尿素の飽
和溶解度は温度によって大きな変化がないので、極めて
精度の高い濃度の尿素水溶液を作ることができる。ま
た、脱硝装置の近傍で尿素水の製造を行うことができ、
還元剤の搬入や保管を粉体である尿素の状態で行えるの
で、作業が安全かつ容易となる。また、尿素は紙袋で倉
庫に保管できるので、従来還元剤として用いられていた
アンモニアガスの高圧タンクやアンモニア水溶液のタン
クが不要になった。As described above, according to this embodiment, the concentration of urea water to be produced can be variously set depending on the amount of water to be mixed and the heating temperature of the solution tank 6. In addition, since the saturated solubility of urea does not change significantly depending on the temperature, it is possible to prepare a highly accurate aqueous urea solution. Also, urea water can be produced near the denitration equipment,
Since the reducing agent can be carried in and stored in the state of urea which is a powder, the work is safe and easy. Further, since urea can be stored in a paper bag in a warehouse, the high-pressure tank for ammonia gas and the tank for aqueous ammonia, which have been conventionally used as reducing agents, are no longer required.
本考案に係る尿素水溶液の製造装置によれば、一定温度
に保持した溶液タンクで飽和溶解度の尿素水を作り、こ
れと水を混合して所望濃度の尿素水を得るようにしてい
るので、きわめて高い精度で規定濃度の尿素水を製造す
ることができる。According to the urea aqueous solution manufacturing apparatus of the present invention, urea water having a saturated solubility is prepared in a solution tank kept at a constant temperature, and this is mixed with water to obtain a desired concentration of urea water. It is possible to manufacture the urea water of the specified concentration with high accuracy.
第１図は本考案の一実施例の全体構成を示すブロック
図、第２図は水に対する尿素の飽和溶解度を示すグラフ
図、第３図は任意流量の30wt％の尿素水溶液を得るため
に必要な38.39wt％の尿素水と水の流量を示すグラフ
図、第４図は第３図に示したグラフの各点における数値
を示す表図である。 ３……尿素水製造装置（装置）、６……溶液タンク、12
……温度保持手段としての加温ヒータ、21……混合部と
してもミキサ、40……設定部としてのコントローラ。FIG. 1 is a block diagram showing the overall configuration of an embodiment of the present invention, FIG. 2 is a graph showing the saturation solubility of urea in water, and FIG. 3 is necessary to obtain an arbitrary 30 wt% urea aqueous solution. FIG. 4 is a graph showing the flow rate of 38.39 wt% urea water and water, and FIG. 4 is a table showing the numerical values at each point of the graph shown in FIG. 3 ... Urea water production device (device), 6 ... Solution tank, 12
...... A heating heater as a temperature holding means, 21 …… A mixer as a mixing section, 40 …… A controller as a setting section.
Claims (1)
温度における飽和溶解度の尿素水を貯える溶液タンク
と、 水を前記溶液タンクから導いた尿素水とを混合させる混
合部と、 前記混合部で所望濃度の尿素水が製造されるように該混
合部に供給される水及び前記溶液タンクからの尿素水の
量を適宜に設定する設定部とを具備することを特徴とす
る尿素水製造装置。1. A solution tank comprising a temperature holding means for keeping the temperature constant, a solution tank for storing urea water having a saturated solubility at the same temperature, a mixing section for mixing water with the urea water led from the solution tank, and the mixing section. Aqueous water production, comprising: a setting unit that appropriately sets the amount of water supplied to the mixing unit and the amount of aqueous urea solution from the solution tank so that a desired concentration of aqueous urea solution is produced in the unit. apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4452790U JPH0711147Y2 (en) | 1990-04-27 | 1990-04-27 | Urea solution manufacturing equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4452790U JPH0711147Y2 (en) | 1990-04-27 | 1990-04-27 | Urea solution manufacturing equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH044035U JPH044035U (en) | 1992-01-14 |
| JPH0711147Y2 true JPH0711147Y2 (en) | 1995-03-15 |
Family
ID=31557913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4452790U Expired - Fee Related JPH0711147Y2 (en) | 1990-04-27 | 1990-04-27 | Urea solution manufacturing equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0711147Y2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016200027A1 (en) * | 2015-06-12 | 2016-12-15 | 경민워터컴(주) | Apparatus for preparing high-purity urea solution, and method for preparing high-purity urea solution using same |
| KR20190009268A (en) * | 2018-08-30 | 2019-01-28 | 주식회사 블루텍 | Device and method for manufacturing of urea water and management system of urea water |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3513163B2 (en) * | 1992-03-27 | 2004-03-31 | 東京瓦斯株式会社 | Method and apparatus for removing nitrogen oxides |
| JP3513162B2 (en) * | 1992-03-27 | 2004-03-31 | 東京瓦斯株式会社 | Nitrogen oxide removal method |
| CN117298847B (en) * | 2023-11-21 | 2024-03-19 | 北京达华洁能工程技术有限公司 | Low-nitrogen combustion denitration device and control method |
-
1990
- 1990-04-27 JP JP4452790U patent/JPH0711147Y2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016200027A1 (en) * | 2015-06-12 | 2016-12-15 | 경민워터컴(주) | Apparatus for preparing high-purity urea solution, and method for preparing high-purity urea solution using same |
| KR20190009268A (en) * | 2018-08-30 | 2019-01-28 | 주식회사 블루텍 | Device and method for manufacturing of urea water and management system of urea water |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH044035U (en) | 1992-01-14 |
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