JP2000001466A - Recovery and utilization of urea dust and ammonia in exhaust gas - Google Patents
Recovery and utilization of urea dust and ammonia in exhaust gasInfo
- Publication number
- JP2000001466A JP2000001466A JP10164575A JP16457598A JP2000001466A JP 2000001466 A JP2000001466 A JP 2000001466A JP 10164575 A JP10164575 A JP 10164575A JP 16457598 A JP16457598 A JP 16457598A JP 2000001466 A JP2000001466 A JP 2000001466A
- Authority
- JP
- Japan
- Prior art keywords
- urea
- ammonia
- dust
- acid
- washing tower
- 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.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
Landscapes
- Treating Waste Gases (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Fertilizers (AREA)
Abstract
(57)【要約】
【課題】 尿素造粒装置から発生する尿素ダスト及びア
ンモニアを含む排ガス中の尿素とアンモニアを回収・利
用する。
【解決手段】 尿素造粒装置から発生する尿素ダスト及
びアンモニアを含むガスを、尿素水溶液が循環する第1
の洗浄塔に送り主として尿素ダストを回収し、次いで尿
素ダストを回収したガスを、酸を添加した水が循環する
第2の洗浄塔に送り主としてアンモニアを回収し、それ
らの回収液を尿素造粒装置の原料中に混合し、尿素製品
を製造する。
(57) [Problem] To recover and utilize urea and ammonia in exhaust gas containing urea dust and ammonia generated from a urea granulator. A urea aqueous solution circulates a gas containing urea dust and ammonia generated from a urea granulation apparatus.
The urea dust is mainly collected by sending the urea dust to the washing tower, and then the gas from which the urea dust is collected is sent to the second washing tower in which the water to which the acid is added circulates to mainly recover the ammonia, and the collected liquid is subjected to urea granulation. The urea product is manufactured by mixing with the raw materials of the apparatus.
Description
【0001】[0001]
【発明の属する技術分野】本発明は造粒尿素製造装置か
ら発生する尿素ダスト及びアンモニアを含む排ガスから
尿素及びアンモニアを回収し、その有効利用を図る方法
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recovering urea and ammonia from an exhaust gas containing urea dust and ammonia generated from an apparatus for producing granulated urea and utilizing the urea and ammonia effectively.
【0002】[0002]
【従来の技術】尿素及びアンモニアを含むガスは、プリ
ル尿素造粒装置、流動層あるいは噴流・噴流層を用いた
造粒尿素製造装置、あるいは化成肥料製造装置等から発
生する。これらの装置において、尿素溶液を固化させる
ためには、固化熱を除去する冷却操作が必要となる。例
えば、プリル尿素造粒装置では、溶融尿素を液滴として
高い塔から落下させ、尿素液滴を空気で冷却して固化さ
せている。冷却に使用された空気は造粒塔頂部から排出
されるが、この排出空気中には冷却固化の際に発生した
尿素ダスト、溶融尿素に含まれ固化とともに冷却空気中
に放たれたアンモニアが含まれる。その排出空気中の濃
度は、造粒塔の大きさ、溶融尿素の分散設備、空気量に
より異なるが、一般には尿素ダスト70〜200 mg/Nm3 、
アンモニア50〜150 mg/Nm3 の範囲である。造粒塔方式
では製造できないより大粒の尿素を製造するには、流動
層内で流動している種粒子に尿素溶液を噴霧し粒子を成
長させる流動層造粒法、噴流層内で行う噴流・流動層造
粒法、流動層クーラーを取り付けた回転ドラムで造粒
し、固化熱を流動層クーラーで除去する流動ドラム造粒
法などの方法がある。これらの方法の場合も、尿素の固
化熱は造粒器中の流動層部分で空気によって冷却され
る。これらの造粒器で造粒された尿素粒は温度が高いの
で、空気により粒子を冷却するために別途設けられた流
動層冷却器によって更に取り扱いやすい温度、例えば50
〜80℃まで冷却される。これら造粒器、流動層冷却器か
らの排出空気にはやはり尿素ダスト、尿素中から放出さ
れたアンモニアが含まれ、プリル造粒塔方式に比べ造粒
器内の空気速度が速いことから、造粒器からの排出空気
に含まれる尿素ダスト濃度は3000〜10000 mg/Nm3 と高
く、アンモニア濃度も空気量が造粒塔方式に比べ少ない
のでその濃度は高く 100〜300mg /Nm3 である。これら
の装置から排出される空気には、上述の通り尿素ダス
ト、アンモニアが相当量含まれるためそのままでは排出
できず、回収設備にて処理した後に排出しなければなら
ない。尿素については、洗浄塔内で循環する希薄な尿素
水溶液と接触させて回収する技術があり、尿素は20〜50
mg/Nm3 の濃度まで低下できる。しかし、アンモニアは
尿素水溶液への溶解度が非常に小さくほとんど吸収され
ないため、上記の高い濃度のままアンモニアが放出され
環境汚染の一つとなっている。2. Description of the Related Art A gas containing urea and ammonia is generated from a prill urea granulator, a granulated urea producing apparatus using a fluidized bed or a spout / spouted bed, or a chemical fertilizer producing apparatus. In these apparatuses, in order to solidify the urea solution, a cooling operation for removing heat of solidification is required. For example, in a prill urea granulator, molten urea is dropped as droplets from a high tower, and urea droplets are cooled by air and solidified. The air used for cooling is discharged from the top of the granulation tower, and the discharged air contains urea dust generated during cooling and solidification, and ammonia released into the cooling air with solidification contained in the molten urea. It is. The concentration in the discharged air depends on the size of the granulation tower, the equipment for dispersing the molten urea, and the amount of air, but in general, urea dust 70 to 200 mg / Nm 3 ,
It is in the range of ammonia 50~150 mg / Nm 3. To produce larger urea than can be produced by the granulation tower method, a fluidized bed granulation method in which a urea solution is sprayed on seed particles flowing in a fluidized bed to grow the particles, a spout in a spouted bed There are a fluidized bed granulation method, a fluidized bed granulation method in which granulation is performed by a rotating drum equipped with a fluidized bed cooler, and heat of solidification is removed by the fluidized bed cooler. Also in these methods, the heat of solidification of urea is cooled by air in the fluidized bed portion in the granulator. Since the temperature of the urea granules granulated by these granulators is high, a temperature that is easier to handle by a fluidized bed cooler separately provided for cooling the particles by air, for example, 50 ° C.
Cool to ~ 80 ° C. The air discharged from these granulators and fluidized bed coolers also contains urea dust and ammonia released from urea, and the air velocity inside the granulator is higher than that of the prill granulation tower system. urea dust concentration in the exhaust air from the grain unit is as high as 3000~10000 mg / Nm 3, the concentration is high 100 to 300 mg / Nm 3 so ammonia concentration amount little air compared with the prilling tower method. As described above, since the air discharged from these devices contains a considerable amount of urea dust and ammonia, it cannot be discharged as it is, but must be discharged after being treated in a recovery facility. There is a technology to recover urea by contacting it with a dilute aqueous urea solution circulating in the washing tower.
It can be reduced to a concentration of mg / Nm 3 . However, since ammonia has a very low solubility in an aqueous urea solution and is hardly absorbed, ammonia is released at the high concentration described above, which is one of the environmental pollutions.
【0003】[0003]
【発明が解決しようとする課題】このアンモニアを除去
・回収する方法として、本発明者らは特開平9−227
493号公報にて、薄い尿素水溶液に少量の酸を加えて
循環させ、尿素ダスト・アンモニアを含む空気と接触さ
せ、尿素はそのまま吸収させ、アンモニアは酸と反応さ
せて塩として回収する方法を提案した。この方法によれ
ば、アンモニアは添加された酸と反応しアンモニウム塩
として回収され、排気ガス中に含まれるアンモニアの量
を20〜30mg/Nm3 まで低減可能であるが、尿素−アンモ
ニウム塩水溶液が生成し、造粒設備外へ排出される。こ
のような尿素−アンモニウム塩水溶液は肥料として利用
できるが、生成する量が非常に限られた量となることか
らその利用が十分なされず、排水として排出されること
もある。本発明は、このような従来技術に鑑み案出され
たものであり、排ガス中に含まれる尿素ダスト・アンモ
ニアの同時除去と、生成する尿素−アンモニウム塩水溶
液を有効利用する手段の提供を目的とする。As a method for removing and recovering this ammonia, the present inventors disclosed in Japanese Patent Application Laid-Open No. 9-227.
No. 493 proposes a method of adding a small amount of acid to a thin aqueous urea solution and circulating it, bringing it into contact with air containing urea dust / ammonia, absorbing urea as it is, and reacting ammonia with the acid to recover it as a salt. did. According to this method, ammonia is recovered as a reaction to the ammonium salt and added acid, but it is possible to reduce the amount of ammonia contained in the exhaust gas to 20-30 mg / Nm 3, the urea - ammonium salt aqueous solution Generated and discharged out of the granulation equipment. Such an aqueous urea-ammonium salt solution can be used as a fertilizer, but the amount of the generated urea-ammonium salt solution is very limited, so that its use is not sufficient and may be discharged as wastewater. The present invention has been devised in view of such a conventional technique, and has as its object to provide a means for simultaneously removing urea dust and ammonia contained in exhaust gas and effectively utilizing the generated urea-ammonium salt aqueous solution. I do.
【0004】[0004]
【課題を解決するための手段】即ち本発明は、尿素造粒
装置から発生する尿素ダスト及びアンモニアを含むガス
を、尿素水溶液が循環する第1の洗浄塔に送り主として
尿素ダストを回収し、次いで尿素ダストを回収したガス
を、酸を添加した水が循環する第2の洗浄塔に送り主と
してアンモニアを回収し、それらの回収液を尿素造粒装
置の原料中に混合し、尿素製品を製造することを特徴と
する排ガス中の尿素ダスト及びアンモニアの回収・利用
方法(以下、本願第1発明という)、及び尿素造粒装置
から発生する尿素ダスト及びアンモニアを含むガスを、
酸を添加した尿素水溶液が循環する洗浄塔に送り尿素ダ
スト及びアンモニアを同時に回収し、その回収液を濃縮
した後、尿素造粒装置の原料中に混合し、尿素製品を製
造することを特徴とする排ガス中の尿素ダスト及びアン
モニアの回収・利用方法(以下、本願第2発明という)
であり、更に、酸として、硝酸、塩酸、硫酸、燐酸の何
れか1乃至複数を組み合わせて使用することを特徴とす
る上記の排ガス中の尿素ダスト及びアンモニアの回収方
法である。That is, according to the present invention, a gas containing urea dust and ammonia generated from a urea granulator is sent to a first washing tower in which an aqueous urea solution circulates, and urea dust is mainly recovered. The gas from which the urea dust has been recovered is sent to a second washing tower in which water containing acid is circulated to mainly recover ammonia, and the recovered liquid is mixed with the raw material of the urea granulator to produce a urea product. A method for recovering and utilizing urea dust and ammonia in exhaust gas (hereinafter referred to as the first invention), and a gas containing urea dust and ammonia generated from a urea granulating apparatus,
The method is characterized in that urea dust and ammonia are simultaneously sent to a washing tower in which an aqueous urea solution to which an acid is circulated to collect urea dust and ammonia, and the recovered liquid is concentrated and then mixed with the raw material of a urea granulator to produce a urea product. And Utilization of Urea Dust and Ammonia in Exhaust Gas (hereinafter referred to as "second invention")
The method for recovering urea dust and ammonia in exhaust gas as described above, further comprising using one or more of nitric acid, hydrochloric acid, sulfuric acid, and phosphoric acid as the acid in combination.
【0005】[0005]
【発明の実施の形態】以下、本発明について詳細に説明
する。図1は、尿素ダスト及びアンモニアを含む排ガス
の発生源の一例である尿素造粒装置から発生する尿素ダ
スト及びアンモニアを、それぞれ吸収液の異なる洗浄塔
を用いて回収・利用する方法を示す概念図であり、図2
は、酸を添加した尿素水溶液を吸収液とする洗浄塔で吸
収・回収し、その液を濃縮した後、利用する方法を示す
概念図である。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. FIG. 1 is a conceptual diagram showing a method of recovering and using urea dust and ammonia generated from a urea granulation apparatus, which is an example of a source of an exhaust gas containing urea dust and ammonia, using washing towers having different absorption liquids. And FIG.
FIG. 3 is a conceptual diagram showing a method of absorbing and recovering in a washing tower using an aqueous urea solution to which an acid is added as an absorbing solution, concentrating the solution, and using the solution.
【0006】先ず、図1を用いて本願第1発明を説明す
る。尿素製造装置から送られてくる尿素水溶液はライン
1を経由して尿素濃縮器Aに送られ濃縮される。濃縮さ
れた尿素は水を多少含んだ溶液状態でライン2を経由し
て造粒器Bに送られる。尿素溶液は造粒器B内で流動し
ている尿素粒子上に噴霧あるいは滴状に供給され、成長
した尿素は造粒器Bからライン3を経由して製品として
抜き出される。造粒器Bには、尿素溶液の固化熱を除去
する目的と流動状態を保つため空気がライン4を経由し
て導入される。冷却に使われた空気は造粒器Bからライ
ン5を経由して排出されるが、その排出空気には造粒形
式、造粒条件により多少異なるが、尿素ダスト、アンモ
ニアがそれぞれ70〜10000 mg/Nm3 、50〜300 mg/Nm3
が含まれている。造粒器Bからの排出空気は、含まれる
尿素ダスト、アンモニアを除去するため、洗浄塔−1C
に送られる。洗浄塔−1Cは充填物が充填された洗浄塔
であり、尿素水溶液が充填層を循環し、充填層内で排ガ
スが尿素水溶液と接触し、排ガス中に含まれる尿素ダス
トを吸収して回収する。尿素ダストを吸収した尿素水溶
液は、ライン8を経由してライン1の尿素水溶液と混合
され、尿素濃縮器Aを経由して再び造粒器Bに送られ製
品化される。循環水の補充のための水はライン12を経
由して洗浄塔−1Cに供給される。洗浄塔−1Cにおい
て、尿素ダスト及びアンモニアを含む排ガスと尿素水溶
液との接触は洗浄塔方式に限らずベンチュリー方式でも
可能であり、ガスと液を接触させる形式のものであれば
全ての形式に適用可能である。洗浄塔−1Cで尿素ダス
トが尿素水溶液によって吸収除去された後の排ガスは、
ライン6を経由して洗浄塔−2Dに送られる。First, the first invention of the present application will be described with reference to FIG. The aqueous urea solution sent from the urea production device is sent to the urea concentrator A via the line 1 and concentrated. The concentrated urea is sent to the granulator B via the line 2 in a solution state containing some water. The urea solution is supplied in the form of a spray or drops onto the urea particles flowing in the granulator B, and the grown urea is extracted as a product from the granulator B via the line 3. Air is introduced into the granulator B via the line 4 in order to remove the heat of solidification of the urea solution and to maintain the fluidized state. The air used for cooling is discharged from the granulator B via the line 5, and the discharged air contains 70 to 10,000 mg of urea dust and ammonia, respectively, depending on the granulation type and granulation conditions. / Nm 3 , 50-300 mg / Nm 3
It is included. The exhaust air from the granulator B is used to remove the urea dust and ammonia contained in the cleaning tower-1C.
Sent to The washing tower-1C is a washing tower filled with a packing material, in which an aqueous urea solution circulates through a packed bed, and exhaust gas comes into contact with the aqueous urea solution in the packed bed to absorb and collect urea dust contained in the exhaust gas. . The urea aqueous solution having absorbed the urea dust is mixed with the urea aqueous solution in the line 1 via the line 8 and sent to the granulator B again via the urea concentrator A to be commercialized. Water for replenishing circulating water is supplied to the washing tower-1C via the line 12. In the washing tower-1C, the contact between the exhaust gas containing urea dust and ammonia and the urea aqueous solution is not limited to the washing tower system, but may be performed by a Venturi system. It is possible. The exhaust gas after the urea dust is absorbed and removed by the aqueous urea solution in the washing tower-1C,
It is sent to the washing tower-2D via the line 6.
【0007】洗浄塔−2Dは充填物が充填された洗浄塔
であり、酸を添加した水が充填層を循環し、充填層内で
排ガスと酸水溶液が接触し、排ガス中に含まれるアンモ
ニアと洗浄塔−1Cで吸収除去されなかった尿素ダスト
が回収される。尿素水溶液ではアンモニアは回収できな
いため、酸を加えて水溶液のpHを 3.5〜7.0 に保つこと
でアンモニアを回収する。アンモニアをアンモニウム塩
として回収した回収液はライン9経由で尿素濃縮器Aか
らの濃縮尿素水溶液に混合され造粒器Bに送られ、製品
中に混合される。また、アンモニアを回収された排ガス
はライン7から大気中に放出される。循環水の補充のた
めの水とpHを所定の値に保つための酸はそれぞれライン
11、10を経由して洗浄塔−2Dに供給される。ここ
で使用する酸の種類は特に制限はないが、硝酸、硫酸、
塩酸及び燐酸がアンモニアとの反応で生成する塩は、そ
れぞれ硝酸アンモニウム(硝安)、硫酸アンモニウム
(硫安)、塩化アンモニウム、燐酸アンモニウム(燐
安)等何れも窒素肥料となるため、製品中に含まれても
尿素としてのその有効性を妨げるものではないので、特
に上記酸の使用が好ましい。燐安中に含まれる燐酸はリ
ン酸肥料であり、また土壌に硫黄が不足している地域で
は硫黄を含む硫安は重要な肥料であり、それを含む尿素
はそのような土壌に適用すると有効である。また、洗浄
塔−2Dにおいても、洗浄塔−1Cの場合と同様に接触
は洗浄塔方式に限らずベンチュリー方式でも可能であ
り、ガスと液を接触させる形式のものであれば全ての形
式に適用可能である。The washing tower-2D is a washing tower filled with a packing material, in which water to which an acid is added circulates through the packed bed, and the exhaust gas and the aqueous acid solution come into contact with each other in the packed bed to remove ammonia contained in the exhaust gas. Urea dust that has not been absorbed and removed in the washing tower-1C is collected. Ammonia cannot be recovered with a urea aqueous solution, so ammonia is recovered by adding an acid to maintain the pH of the aqueous solution at 3.5 to 7.0. The recovered liquid obtained by recovering ammonia as an ammonium salt is mixed with the concentrated aqueous urea solution from the urea concentrator A via the line 9, sent to the granulator B, and mixed with the product. Further, the exhaust gas from which the ammonia has been recovered is discharged from the line 7 into the atmosphere. The water for replenishing the circulating water and the acid for keeping the pH at a predetermined value are supplied to the washing tower-2D via the lines 11 and 10, respectively. The type of acid used here is not particularly limited, but nitric acid, sulfuric acid,
Salts generated by the reaction of hydrochloric acid and phosphoric acid with ammonia include ammonium nitrate (ammonium nitrate), ammonium sulfate (ammonium sulfate), ammonium chloride, ammonium phosphate (ammonium phosphate), etc., all of which become nitrogen fertilizers. The use of the above acids is particularly preferred, as it does not interfere with its effectiveness as urea. Phosphoric acid contained in ammonium phosphate is a phosphate fertilizer, and in areas where the soil is short of sulfur, ammonium sulfate containing sulfur is an important fertilizer, and urea containing it is effective when applied to such soil. is there. Also in the washing tower-2D, the contact is not limited to the washing tower system but may be a venturi system as in the case of the washing tower-1C, and is applicable to all types as long as the gas and liquid are in contact. It is possible.
【0008】洗浄塔−1Cあるいは洗浄塔−2Dでそれ
ぞれ回収される回収液の濃度は、上流の尿素濃縮器A、
造粒器Bを含めた装置全体の物質収支がとれるように濃
度を調節して、造粒器Bで尿素を造粒する際の造粒に影
響のない濃度にして、それぞれ尿素水溶液あるいは濃縮
尿素水溶液に混合されなければならない。洗浄塔−1C
からライン8を経由して回収される尿素溶液は、尿素濃
縮器Aで造粒可能な濃度まで濃縮するので特別な制限は
ないが、尿素濃縮器Aの蒸発負荷を軽くする上で、尿素
濃度10〜40%、特に30〜40%まで濃縮して尿素水溶液に
混合するのが好ましい。[0008] The concentration of the recovered liquid recovered in the washing tower-1C or the washing tower-2D, respectively, depends on the urea concentrator A,
The concentration is adjusted so that the mass balance of the entire apparatus including the granulator B can be obtained, and the concentration is adjusted so as not to affect the granulation when the urea is granulated by the granulator B. Must be mixed in aqueous solution. Washing tower-1C
The urea solution recovered from the urea via line 8 is not particularly limited because it is concentrated to a concentration at which granulation can be performed by the urea concentrator A. It is preferred to concentrate to 10 to 40%, especially to 30 to 40%, and mix with the aqueous urea solution.
【0009】洗浄塔−2Dからライン9を経由して回収
される尿素とアンモニウム塩の混合水溶液は、尿素濃縮
器Aからの尿素水溶液濃度にもよるが、一般的な濃度で
ある96%尿素水溶液の場合、80%以下の水を含む水溶
液、即ち(尿素+アンモニウム塩)濃度が20%以上の濃
度まで濃縮されて濃縮尿素水溶液と混合するのが好まし
い。得られる製品尿素粒子中のアンモニウム塩濃度は、
尿素水溶液に含まれるアンモニアの量、回収したアンモ
ニアの量にもよるが、0.1 〜0.3 %となる。[0009] The mixed aqueous solution of urea and ammonium salt recovered from the washing tower-2D via the line 9 depends on the concentration of the urea aqueous solution from the urea concentrator A. In this case, it is preferable that the aqueous solution containing water of 80% or less, that is, the concentration of (urea + ammonium salt) be concentrated to 20% or more and mixed with the concentrated aqueous urea solution. The ammonium salt concentration in the resulting product urea particles is
Although it depends on the amount of ammonia contained in the aqueous urea solution and the amount of recovered ammonia, it is 0.1 to 0.3%.
【0010】次に、図2を用いて本願第2発明を説明す
る。造粒器Bからの尿素ダスト及びアンモニアを含む排
ガスは、ライン5を経由して洗浄塔Eに送られる。洗浄
塔Eは充填物が充填された洗浄塔であり、洗浄液として
酸を含む尿素水溶液が充填層を循環し、充填層内で排ガ
スが該洗浄液と接触し、排ガス中に含まれる尿素ダスト
とアンモニアを吸収して回収する。アンモニアはアンモ
ニウム塩として回収されるのは第1発明と同じである。Next, the second invention of the present application will be described with reference to FIG. Exhaust gas containing urea dust and ammonia from the granulator B is sent to the washing tower E via the line 5. The washing tower E is a washing tower filled with a packing material, and an aqueous urea solution containing an acid as a washing liquid circulates through the packed bed, and exhaust gas comes into contact with the washing liquid in the packed bed, and urea dust and ammonia contained in the exhaust gas are discharged. Absorb and collect. As in the first invention, ammonia is recovered as an ammonium salt.
【0011】ライン13を経由して洗浄塔Eから回収さ
れる液は、尿素+アンモニウム塩水溶液であり、その濃
度(尿素+アンモニウム塩濃度)は10〜50%である。こ
れ以上の濃度で回収しようとすると洗浄塔の性能が悪く
なり、期待するだけの回収ができない。アンモニウム塩
を含む尿素水溶液を尿素濃縮器Aで濃縮することは、濃
縮器Aで分離した蒸気の有効利用を妨げるので、回収液
は尿素濃縮器Aを出た尿素溶液に混合する必要がある。
しかし、この水溶液濃度では回収液量が大きいため、尿
素濃縮器Aからの尿素濃度が水をほとんど含まない99.7
%水溶液まで濃縮しても、上記回収液と混合すると混合
後の濃度は造粒が難しい濃度となってしまう。従って、
回収された尿素・アンモニウム塩水溶液は、ライン13
を経由して尿素・硝安濃縮器Fに送られ濃縮される。即
ち、混合後の濃度が造粒に適当な濃度(水が多くても6
%)になるよう、回収液を60%以上に尿素・硝安濃縮器
Fで濃縮してから、尿素濃縮器Aからの尿素と混合する
必要がある。洗浄塔Eで尿素ダスト及びアンモニアが吸
収除去された排ガスはライン7から排出される。洗浄塔
Eに補給される水及び酸は、それぞれライン11、10
から補給される。かかる本願第2発明の装置において、
特に言及していない装置、あるいは酸の種類等について
は、本願第1発明と同様にすればよい。The liquid recovered from the washing tower E via the line 13 is an aqueous solution of urea + ammonium salt, and its concentration (urea + ammonium salt concentration) is 10 to 50%. Attempting to recover at a concentration higher than this will impair the performance of the washing tower and will not allow the expected recovery. Concentrating an aqueous urea solution containing an ammonium salt with the urea concentrator A prevents effective use of the steam separated by the concentrator A. Therefore, the recovered liquid needs to be mixed with the urea solution exiting the urea concentrator A.
However, since the amount of the recovered liquid is large at this aqueous solution concentration, the urea concentration from the urea concentrator A contains almost no water.
Even when concentrated to a% aqueous solution, if mixed with the above-mentioned recovered liquid, the concentration after mixing becomes a concentration at which granulation is difficult. Therefore,
The recovered aqueous urea / ammonium salt solution is supplied to line 13
Is sent to a urea / ammonium concentrator F via the and concentrated. That is, the concentration after mixing is an appropriate concentration for granulation (6
%), It is necessary to concentrate the recovered liquid to 60% or more in the urea / ammonium concentrator F and then mix it with the urea from the urea concentrator A. The exhaust gas from which urea dust and ammonia have been absorbed and removed in the washing tower E is discharged from the line 7. The water and acid supplied to the washing tower E are supplied to the lines 11 and 10 respectively.
Replenished from. In the device of the second invention of this application,
Apparatuses not specifically mentioned, types of acids, and the like may be the same as in the first invention of the present application.
【0012】[0012]
【実施例】以下、実施例により本発明を更に具体的に説
明するが、本発明はこれに限定されるものではない。 実施例1 図1に示す装置を用いて、排ガス中の尿素ダスト及びア
ンモニアの回収・利用を行った。造粒尿素製造能力50t
/hの噴流・流動層方式の造粒器Bにおいて、220000 N
m3/hの空気を使用した。この空気が造粒器Bから排出
される時点で尿素ダスト2160kg/h、アンモニア30kg/
hを含んでいた。造粒器Bからの排出空気は、洗浄塔−
1Cに送られた。洗浄塔−1Cは充填塔であり、40%尿
素水溶液が 220t/hで循環しており、排出空気中の尿
素ダスト2151kg/hが溶解・回収された。回収された尿
素2151kg/hは水3227kg/hとともにライン8を経由し
て尿素濃縮器Aに送られた。洗浄塔−1Cで尿素ダスト
を除去された排出空気は、洗浄塔−2Dに送られた。洗
浄塔−2Dは充填塔であり、硝酸酸性水溶液(硝酸93kg
/h、水174 kg/h)が添加された水溶液を循環して排
出空気中のアンモニアを硝酸アンモニウムとして吸収・
回収した。回収液は硝酸アンモニウム118 kg/h、尿素
2kg/h、水174 kg/hからなる組成で、ライン9を経
由して尿素濃縮器Aから送り出される濃縮尿素水溶液
(尿素52008 kg/h、アンモニア30kg/h、水2137kg/
h)に混合され、造粒器Bに送られた。造粒器Bから
は、尿素粒子50118 kg/hが得られた。得られた尿素粒
子の組成は、尿素99.47 %、硝酸アンモニウム0.23%、
水分0.30%であった。洗浄塔−1C及び洗浄塔−2Dで
処理された排出空気(220000 Nm3/h)中に含まれる尿
素は7kg/h(32mg/Nm3)で99.6%の尿素が除去され、
アンモニアの含有量は5kg/h(23mg/Nm3)で83.3%の
アンモニアが除去された。EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the present invention is limited thereto. Example 1 Using the apparatus shown in FIG. 1, urea dust and ammonia in exhaust gas were collected and used. Granulated urea production capacity 50t
/ H in a spout / fluidized bed granulator B
m 3 / h air was used. When this air is discharged from the granulator B, urea dust 2160 kg / h and ammonia 30 kg / h
h. Air discharged from the granulator B is supplied to the washing tower-
Sent to 1C. The washing tower-1C is a packed tower, in which a 40% aqueous urea solution was circulated at 220 t / h, and 2151 kg / h of urea dust in the discharged air was dissolved and recovered. The recovered urea 2151 kg / h was sent to the urea concentrator A via the line 8 together with water 3227 kg / h. The discharged air from which urea dust was removed in the washing tower-1C was sent to the washing tower-2D. Washing tower-2D is a packed tower, and is an aqueous nitric acid solution (93 kg of nitric acid).
/ H, water 174 kg / h) is circulated and the ammonia in the exhaust air is absorbed as ammonium nitrate.
Collected. The recovered liquid has a composition of 118 kg / h of ammonium nitrate, 2 kg / h of urea, and 174 kg / h of water. The concentrated urea aqueous solution (urea 52008 kg / h, ammonia 30 kg / h) sent out from the urea concentrator A via the line 9 h, water 2137kg /
h) and sent to the granulator B. From granulator B, 50118 kg / h of urea particles were obtained. The composition of the urea particles obtained is 99.47% urea, 0.23% ammonium nitrate,
The water content was 0.30%. The urea contained in the exhaust air (220,000 Nm 3 / h) treated in the washing tower-1C and the washing tower-2D was 9 kg / h (32 mg / Nm 3 ), and 99.6% of urea was removed.
The ammonia content was 5 kg / h (23 mg / Nm 3 ), and 83.3% of ammonia was removed.
【0013】実施例2 図2に示す装置を用いて、排ガス中の尿素ダスト及びア
ンモニアの回収・利用を行った。造粒尿素製造能力50t
/hの噴流・流動層方式の造粒器Bにおいて、220000 N
m3/hの空気を使用した。この空気が造粒器Bから排出
される時点で尿素ダスト2160kg/h、アンモニア30kg/
hを含んでいた。造粒器Bからの排出空気は、洗浄塔E
に送られた。洗浄塔Eは充填塔であり、40%尿素・硝安
混合水溶液が 220t/hで循環しており、排出空気中の
尿素ダスト2151kg/hが溶解・回収され、アンモニアは
硝酸酸性水溶液を循環水に加えて硝酸アンモニウムとし
て回収された。回収液の組成は、尿素2153kg/h、硝酸
アンモニウム118 kg/h、水3406kg/hであり、尿素・
硝安濃縮器Fにて水が5%になるまで加熱濃縮し、尿素
2153kg/h、硝酸アンモニウム11kg/h、水120 kg/h
の水溶液を得た。この水溶液を尿素濃縮器Aから送り出
される濃縮尿素水溶液(尿素49857 kg/h、アンモニア
30kg/h、水2047kg/h)に混合し、造粒器Bに送っ
た。造粒器Bからは、尿素粒子50118 kg/hが得られ
た。得られた尿素粒子の組成は、尿素99.47 %、硝酸ア
ンモニウム0.23%、水分0.30%であった。Example 2 Using the apparatus shown in FIG. 2, urea dust and ammonia in exhaust gas were recovered and used. Granulated urea production capacity 50t
/ H in a spout / fluidized bed granulator B
m 3 / h air was used. When this air is discharged from the granulator B, urea dust 2160 kg / h and ammonia 30 kg / h
h. The air discharged from the granulator B is supplied to the washing tower E
Sent to The washing tower E is a packed tower, in which a 40% urea / ammonium nitrate mixed aqueous solution is circulated at 220 t / h, and 215 kg / h of urea dust in the discharged air is dissolved and recovered, and the ammonia is converted from a nitric acid aqueous solution into circulating water. In addition, it was recovered as ammonium nitrate. The composition of the recovered liquid was 2153 kg / h of urea, 118 kg / h of ammonium nitrate, and 3406 kg / h of water.
Heat and concentrate in a nitric acid concentrator F until the water becomes 5%,
2153 kg / h, ammonium nitrate 11 kg / h, water 120 kg / h
Was obtained. The concentrated aqueous urea solution (urea 49857 kg / h, ammonia
30 kg / h, water 2047 kg / h) and sent to the granulator B. From granulator B, 50118 kg / h of urea particles were obtained. The composition of the obtained urea particles was 99.47% urea, 0.23% ammonium nitrate, and 0.30% water.
【0014】洗浄塔Eで処理された排出空気(220000 N
m3/h)中に含まれる尿素は7kg/h(32mg/Nm3)で9
9.6%の尿素が除去され、アンモニアの含有量は5kg/
h(23mg/Nm3)で83.3%のアンモニアが除去された。The exhaust air treated in the washing tower E (220000 N
The amount of urea contained in m 3 / h) is 9 kg / h (32 mg / Nm 3 ) and 9
9.6% urea is removed and ammonia content is 5kg /
h (23 mg / Nm 3 ) removed 83.3% of the ammonia.
【0015】[0015]
【発明の効果】本発明によれば、尿素造粒装置からの尿
素ダスト、アンモニアを含有する排気ガスを、尿素水溶
液、更に酸を含む水溶液、あるいは酸を含む尿素水溶液
で処理するため、尿素ダストのみならずアンモニアも同
時に吸収回収できる。更に回収された尿素及びアンモニ
ウム塩を造粒器に送ることで、尿素、アンモニアとも製
品中に含ませることができ、原料の有効利用がなされ
る。According to the present invention, urea dust and ammonia-containing exhaust gas from a urea granulator are treated with an aqueous urea solution, an aqueous solution containing an acid, or an aqueous urea solution containing an acid. In addition, ammonia can be simultaneously absorbed and recovered. Further, by sending the recovered urea and ammonium salts to the granulator, both urea and ammonia can be contained in the product, and the raw materials can be effectively used.
【図1】本願第1発明により排ガスに含まれる尿素ダス
ト及びアンモニアを回収・利用する方法の一実施例を示
す概念図である。FIG. 1 is a conceptual diagram showing one embodiment of a method for recovering and utilizing urea dust and ammonia contained in exhaust gas according to the first invention of the present application.
【図2】本願第2発明により排ガスに含まれる尿素ダス
ト及びアンモニアを回収・利用する方法の一実施例を示
す概念図である。FIG. 2 is a conceptual diagram showing one embodiment of a method for recovering and utilizing urea dust and ammonia contained in exhaust gas according to the second invention of the present application.
A…尿素濃縮器 B…造粒器 C…洗浄塔−1 D…洗浄塔−2 E…洗浄塔 F…尿素・硝安濃縮器 ライン1…尿素合成セクションからの尿素水溶液 ライン2…濃縮尿素水溶液 ライン3…尿素製品 ライン4…造粒用空気 ライン5…造粒器排出空気 ライン6…洗浄塔−1排出空気 ライン7…洗浄塔−2排出空気 ライン8…洗浄塔−1回収尿素水溶液 ライン9…洗浄塔−2回収尿素水溶液 ライン10…アンモニア回収用硝酸 ライン11…洗浄塔−2回収硝安水溶液濃度調節用水 ライン12…洗浄塔−1回収尿素水溶液濃度調節用水 ライン13…洗浄塔回収尿素・硝安水溶液 ライン14…濃縮回収尿素・硝安水溶液 A: Urea concentrator B: Granulator C: Washing tower-1 D: Washing tower-2 E: Washing tower F: Urea / ammonium concentrator Line 1: Urea aqueous solution from urea synthesis section Line 2: Concentrated urea aqueous solution line 3 ... Urea product line 4 ... Granulating air line 5 ... Granulator discharge air line 6 ... Washing tower-1 exhaust air line 7 ... Washing tower-2 exhaust air line 8 ... Washing tower-1 recovered urea aqueous solution line 9 ... Washing tower-2 recovered urea aqueous solution line 10 ... ammonia recovery nitric acid line 11 ... washing tower-2 recovered ammonium nitrate aqueous solution concentration adjusting water line 12 ... washing tower-1 recovered urea aqueous solution concentration adjusting water line 13 ... washing tower recovered urea / ammonium aqueous solution Line 14: Concentrated and recovered urea / ammonium aqueous solution
フロントページの続き (51)Int.Cl.7 識別記号 FI テーマコート゛(参考) C05C 13/00 C05G 1/00 H C05G 1/00 C07C 273/14 C07C 273/14 275/02 275/02 B01D 53/34 131 Fターム(参考) 4D002 AA13 AA40 BA02 CA07 DA26 DA57 EA02 4H006 AA02 AC13 AC56 AD18 AD33 BD31 BD33 BD51 BD60 BD84 BE01 BE02 BE03 BE04 4H061 AA02 BB03 BB08 BB10 BB11 BB14 BB29 BB32 EE02 EE04 EE05 EE07 FF08 GG06 GG22 GG26 GG29 GG41 GG46 GG47Continuation of the front page (51) Int.Cl. 7 Identification code FI Theme coat II (reference) C05C 13/00 C05G 1/00 H C05G 1/00 C07C 273/14 C07C 273/14 275/02 275/02 B01D 53 / 34 131 F-term (reference) 4D002 AA13 AA40 BA02 CA07 DA26 DA57 EA02 4H006 AA02 AC13 AC56 AD18 AD33 BD31 BD33 BD51 BD60 BD84 BE01 BE02 BE03 BE04 4H061 AA02 BB03 BB08 BB10 BB11 BB14 BB29 BB32 GG04 GG04 GG47
Claims (4)
びアンモニアを含むガスを、尿素水溶液が循環する第1
の洗浄塔に送り主として尿素ダストを回収し、次いで尿
素ダストを回収したガスを、酸を添加した水が循環する
第2の洗浄塔に送り主としてアンモニアを回収し、それ
らの回収液を尿素造粒装置の原料中に混合し、尿素製品
を製造することを特徴とする排ガス中の尿素ダスト及び
アンモニアの回収・利用方法。1. A urea aqueous solution circulates a gas containing urea dust and ammonia generated from a urea granulation device to a first gas.
The urea dust is mainly collected by sending the urea dust to the washing tower, and then the gas from which the urea dust is collected is sent to the second washing tower in which the water to which the acid is added circulates to mainly recover the ammonia, and the collected liquid is subjected to urea granulation. A method for recovering and utilizing urea dust and ammonia in exhaust gas, wherein the urea product is mixed with raw materials of an apparatus to produce a urea product.
れか1乃至複数を組み合わせて使用することを特徴とす
る請求項1記載の排ガス中の尿素ダスト及びアンモニア
の回収方法。2. The method according to claim 1, wherein one or more of nitric acid, hydrochloric acid, sulfuric acid and phosphoric acid are used in combination as the acid.
びアンモニアを含むガスを、酸を添加した尿素水溶液が
循環する洗浄塔に送り尿素ダスト及びアンモニアを同時
に回収し、その回収液を濃縮した後、尿素造粒装置の原
料中に混合し、尿素製品を製造することを特徴とする排
ガス中の尿素ダスト及びアンモニアの回収・利用方法。3. A gas containing urea dust and ammonia generated from a urea granulation apparatus is sent to a washing tower in which an aqueous urea solution to which an acid is added circulates to collect urea dust and ammonia at the same time. A method for recovering and utilizing urea dust and ammonia in exhaust gas, wherein the urea product is manufactured by mixing the urea product with raw materials of a urea granulator.
れか1乃至複数を組み合わせて使用することを特徴とす
る請求項3記載の排ガス中の尿素ダスト及びアンモニア
の回収方法。4. The method for recovering urea dust and ammonia in exhaust gas according to claim 3, wherein any one or more of nitric acid, hydrochloric acid, sulfuric acid and phosphoric acid are used as the acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10164575A JP2000001466A (en) | 1998-06-12 | 1998-06-12 | Recovery and utilization of urea dust and ammonia in exhaust gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10164575A JP2000001466A (en) | 1998-06-12 | 1998-06-12 | Recovery and utilization of urea dust and ammonia in exhaust gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000001466A true JP2000001466A (en) | 2000-01-07 |
Family
ID=15795784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10164575A Pending JP2000001466A (en) | 1998-06-12 | 1998-06-12 | Recovery and utilization of urea dust and ammonia in exhaust gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000001466A (en) |
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1998
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