JP5178659B2 - Sulfuric acid production facility - Google Patents

Sulfuric acid production facility Download PDF

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JP5178659B2
JP5178659B2 JP2009172331A JP2009172331A JP5178659B2 JP 5178659 B2 JP5178659 B2 JP 5178659B2 JP 2009172331 A JP2009172331 A JP 2009172331A JP 2009172331 A JP2009172331 A JP 2009172331A JP 5178659 B2 JP5178659 B2 JP 5178659B2
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建夫 田中
啓太 森本
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Sumitomo Heavy Industries Ltd
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Description

本発明は、硫酸製造設備に関する。   The present invention relates to a sulfuric acid production facility.

従来、ＳＯ２含有ガス中のＳＯ２をＳＯ３に転化する転化器と、ＳＯ２の転化により生じたＳＯ３を循環濃硫酸に吸収させてさらに高濃度の濃硫酸を製造する吸収塔と、を備える硫酸製造設備が知られている（例えば、特許文献１参照）。また、このような硫酸製造設備においては、転化器の前段に、転化器に導入するＳＯ２含有ガス中の水分を、循環硫酸に吸収させて除去する乾燥塔を配設することが広く行われている。 Conventionally, the absorption tower to produce a converter to convert the SO 2 in SO 2 containing gas to SO 3, the higher concentrations of sulfuric acid by absorption of SO 3 produced by the conversion of SO 2 to the circulation of concentrated sulfuric acid, There is known a sulfuric acid production facility comprising (see, for example, Patent Document 1). In such a sulfuric acid production facility, a drying tower is widely disposed in the upstream of the converter to absorb and remove moisture in the SO 2 -containing gas introduced into the converter by circulating sulfuric acid. ing.

特開２００２−５３３１１号公報JP 2002-53311 A

上記のような硫酸製造設備は、例えばその起動時等であって、転化器の温度が低い場合には、ＳＯ２をＳＯ３に転化可能な所定の温度まで転化器を昇温する必要があり、そのような場合には、乾燥塔、転化器、吸収塔にＳＯ２含有ガスや大気等のガスを通しながら転化器の昇温を行っている。その間、乾燥塔には、ＳＯ２含有ガスや大気等のガスが新たに導入され続けるため、これらのガス中の水分が循環硫酸に吸収されて、循環硫酸の濃度が大幅に低下してしまう。そして、濃度が大幅に低下した循環硫酸は、乾燥塔の腐食の原因となるため、乾燥塔から廃硫酸として排出しなければならない。このように、上記のような硫酸製造設備においては、転化器を昇温する間に、濃度が大幅に低下した廃硫酸が大量に製造されてしまうという問題がある。 The sulfuric acid production facility as described above is, for example, at the time of start-up, and when the temperature of the converter is low, the converter needs to be heated to a predetermined temperature at which SO 2 can be converted to SO 3 . In such a case, the temperature of the converter is raised while passing a gas such as SO 2 -containing gas or the atmosphere through a drying tower, a converter, and an absorption tower. In the meantime, since a gas such as SO 2 containing gas or air is continuously introduced into the drying tower, the water in these gases is absorbed by the circulating sulfuric acid, and the concentration of the circulating sulfuric acid is greatly reduced. And since the circulating sulfuric acid whose density | concentration fell significantly becomes a cause of corrosion of a drying tower, it must be discharged | emitted as waste sulfuric acid from a drying tower. Thus, in the sulfuric acid production facility as described above, there is a problem that a large amount of waste sulfuric acid having a greatly reduced concentration is produced while the converter is heated.

本発明は、このような課題を解決するために成されたものであり、転化器を昇温する間に廃硫酸が製造されることを防止可能な硫酸製造設備を提供することを目的とする。   The present invention has been made to solve such a problem, and an object of the present invention is to provide a sulfuric acid production facility capable of preventing the production of waste sulfuric acid while raising the temperature of the converter. .

そこで、本発明による硫酸製造設備は、ＳＯ２を含むガス中の水分を硫酸に吸収させ除去し水分が除去されたガスを排出する乾燥塔と、乾燥塔より排出されるガスを導入し該ガス中のＳＯ２をＳＯ３に転化してＳＯ３を含有するガスを排出する転化器と、転化器より排出されるガスを導入し該ガス中のＳＯ３を硫酸に吸収させて回収する一方で、このＳＯ３が回収された後のオフガスを排出する吸収塔と、を備える硫酸製造設備において、吸収塔から排出されるオフガスを、転化器の昇温時に乾燥塔へ導入する導入ラインを備えることを特徴とする。 In view of this, the sulfuric acid production facility according to the present invention introduces a drying tower that absorbs and removes moisture in the gas containing SO 2 by sulfuric acid and discharges the gas from which moisture has been removed, and introduces the gas discharged from the drying tower. While converting the SO 2 therein to SO 3 and discharging the gas containing SO 3 , the gas discharged from the converter is introduced, and the SO 3 in the gas is absorbed into sulfuric acid and recovered. And a sulfuric acid production facility comprising an absorption tower for discharging off-gas after the recovery of SO 3 , and an introduction line for introducing the off-gas discharged from the absorption tower to the drying tower when the temperature of the converter is increased It is characterized by.

このような硫酸製造設備によれば、乾燥塔で水分が除去された後に転化器を経て吸収塔より排出されるオフガスを、導入ラインによって、再び乾燥塔へ導入することができる。これによれば、転化器を昇温する間に順次乾燥塔へ導入されるガスが、水分が除去されたガスとされるため、転化器を昇温する間に乾燥塔の硫酸の濃度が低下することが抑制される。よって、転化器を昇温する間に廃硫酸が製造されることが防止される。   According to such a sulfuric acid production facility, off-gas discharged from the absorption tower through the converter after moisture is removed in the drying tower can be reintroduced into the drying tower through the introduction line. According to this, since the gas sequentially introduced into the drying tower while raising the temperature of the converter is the gas from which moisture has been removed, the concentration of sulfuric acid in the drying tower decreases while the temperature of the converter is raised. Is suppressed. Therefore, it is possible to prevent the production of waste sulfuric acid while raising the temperature of the converter.

このように本発明によれば、転化器を昇温する間に廃硫酸が製造されることを防止できる。   Thus, according to the present invention, it is possible to prevent the production of waste sulfuric acid while raising the temperature of the converter.

本実施形態に係る硫酸製造設備を示す構成図である。It is a block diagram which shows the sulfuric acid manufacturing equipment which concerns on this embodiment.

以下、本発明に係る硫酸製造設備の好適な実施形態について図１を参照して説明する。図１は本実施形態に係る硫酸製造設備を示す構成図である。   Hereinafter, a preferred embodiment of a sulfuric acid production facility according to the present invention will be described with reference to FIG. FIG. 1 is a configuration diagram showing a sulfuric acid production facility according to this embodiment.

図１に示される硫酸製造設備１０は、ＳＯ２を含む原料ガスから硫酸を製造するものである。ここで、本実施形態における原料ガスは、例えば活性炭等の炭素質吸着材を利用した排ガス処理設備において、排ガス中のＳＯ２を吸着した炭素質吸着材を再生する際に発生する高濃度ＳＯ２含有ガスである。 A sulfuric acid production facility 10 shown in FIG. 1 produces sulfuric acid from a raw material gas containing SO 2 . Here, the raw material gas in the present embodiment is, for example, high concentration SO 2 generated when regenerating the carbonaceous adsorbent that has adsorbed SO 2 in the exhaust gas in an exhaust gas treatment facility using a carbonaceous adsorbent such as activated carbon. Contains gas.

硫酸製造設備１０は、原料ガス中の水分を硫酸に吸収させて除去し水分を除去したガスを排出する乾燥塔１と、乾燥塔１から排出されるガスを導入しこのガスに含まれるＳＯ２をＳＯ３に転化してＳＯ３を含むガスを排出する転化器２と、転化器２から排出されるガスを導入しこのガスに含まれるＳＯ３を硫酸に吸収させて回収し高濃度の硫酸を製造すると共にＳＯ３を回収したガスをオフガスとして排出する吸収塔３と、を備えると共に、原料ガスを乾燥塔１へ導入するためのガスラインＬ１と、乾燥塔１より排出されるガスを転化器２へ移送するためのガスラインＬ２と、ガスラインＬ２から一旦分岐して再びガスラインＬ２へ合流するガスラインＬ３と、転化器２より排出されるガスの一部を吸収塔３へ移送するためのガスラインＬ４と、転化器２より排出されるガスの残部を転化器２と後述する熱交換器５との間で循環させるためのガスラインＬ５と、吸収塔３より排出されるオフガスを外部へ放出するためのオフガスラインＬ６と、を備えており、さらに、ガスラインＬ２及びガスラインＬ４に配設され乾燥塔１から転化器２へ向かうガスと転化器２から吸収塔３へ向かうガスとの間で熱交換を行う熱交換器４と、ガスラインＬ２及びガスラインＬ５に配設され乾燥塔１から転化器２へ向かうガスと転化器２と熱交換器５とを循環するガスとの間で熱交換を行う熱交換器５と、ガスラインＬ３に配設され導入されるガスを加熱する始動炉６と、乾燥塔１から転化器２へ向かうガスの流れや転化器２から吸収塔３へ向かうガスの流れ等を形成すべくガスラインＬ２に配設されたブロワＢと、を備えている。 The sulfuric acid production facility 10 introduces the gas discharged from the drying tower 1 into which the moisture removed from the raw material gas is absorbed by sulfuric acid and removed, and the gas discharged from the drying tower 1 is introduced into the SO 2 contained in this gas. the a converter 2 and converted to SO 3 for discharging the gas containing SO 3, converter 2 by introducing a gas discharged from the high concentration of sulfuric acid SO 3 contained in the gas is recovered by absorption in sulfuric acid And an absorption tower 3 for discharging the gas from which SO 3 is recovered as off-gas, and a gas line L1 for introducing the raw material gas into the drying tower 1 and a gas discharged from the drying tower 1 are converted. A gas line L2 for transfer to the converter 2, a gas line L3 once branched from the gas line L2 and joined again to the gas line L2, and a part of the gas discharged from the converter 2 is transferred to the absorption tower 3 For gas line 4 and a gas line L5 for circulating the remainder of the gas discharged from the converter 2 between the converter 2 and a heat exchanger 5 described later, and off-gas discharged from the absorption tower 3 to the outside. An off-gas line L6, and a gas line L2 and a gas line L4 disposed between the gas from the drying tower 1 toward the converter 2 and the gas from the converter 2 toward the absorption tower 3 Heat is generated between the heat exchanger 4 that performs heat exchange, the gas that is disposed in the gas line L2 and the gas line L5 and that travels from the drying tower 1 to the converter 2, and the gas that circulates through the converter 2 and the heat exchanger 5. A heat exchanger 5 for exchanging, a starter furnace 6 for heating the gas introduced and introduced in the gas line L3, and a gas flow from the drying tower 1 to the converter 2 or from the converter 2 to the absorption tower 3 Arranged in gas line L2 to form gas flow etc. Blower B.

乾燥塔１は、ガスラインＬ１より底部から導入されて上向する原料ガスに対して下向きに硫酸を噴霧し原料ガスと硫酸とを接触させる硫酸噴霧ノズル１ａと、硫酸噴霧ノズル１ａから噴霧された硫酸と原料ガスとの接触面積を高めるための充填層１ｂとを有しており、この構成により、原料ガス中の水分を硫酸に吸収させて除去し、水分を除去したガスを塔頂部から排出する。   The drying tower 1 was sprayed from the sulfuric acid spray nozzle 1a, which was introduced from the bottom of the gas line L1 and sprayed with sulfuric acid downward on the raw material gas and brought into contact with the raw material gas and sulfuric acid. It has a packed bed 1b for increasing the contact area between the sulfuric acid and the raw material gas. With this structure, the moisture in the raw material gas is absorbed and removed by sulfuric acid, and the gas from which the moisture has been removed is discharged from the top of the tower. To do.

転化器２は、酸化触媒が充填されてなる触媒層が複数積層されて構成されており、ガスラインＬ２より上部から導入されるガスを、これらの複数の触媒層に通すことによって、ガス中のＳＯ２を酸化させてＳＯ３に転化し、ＳＯ３を含有するガスを底部から排出する。 The converter 2 is configured by laminating a plurality of catalyst layers filled with an oxidation catalyst. By passing a gas introduced from the upper part of the gas line L2 through these catalyst layers, the converter 2 was oxidized SO 2 converted to SO 3, it is discharged from the bottom of the gas containing SO 3.

吸収塔３は、ガスラインＬ４より底部から導入されて上向するガスに対して下向きに硫酸を噴霧しガスと硫酸とを接触させる硫酸噴霧ノズル３ａと、硫酸噴霧ノズル３ａから噴霧された硫酸とガスとの接触面積を高めるための充填層３ｂとを有しており、この構成により導入されるガス中のＳＯ３を硫酸に吸収させて回収して高濃度の硫酸を製造し、ＳＯ３が回収された後のガスをオフガスとして塔頂部から排出する。 The absorption tower 3 is composed of a sulfuric acid spray nozzle 3a for spraying sulfuric acid downward with respect to the gas introduced from the bottom through the gas line L4 and bringing the gas into contact with sulfuric acid, and sulfuric acid sprayed from the sulfuric acid spray nozzle 3a. has a filling layer 3b to increase the contact area with the gas, the SO 3 in the gas to be introduced by this arrangement to produce a high concentration of sulfuric acid is recovered by absorption in sulfuric acid, SO 3 The recovered gas is discharged from the top of the tower as off-gas.

始動炉６は、ガスを加熱するための加熱装置を有し、転化器２の昇温時に、乾燥塔１から排出されるガスの一部を導入し、導入したガスを上記加熱装置で加熱し、加熱ガスを排出する。   The starter furnace 6 has a heating device for heating the gas, and when the temperature of the converter 2 is increased, a part of the gas discharged from the drying tower 1 is introduced, and the introduced gas is heated by the heating device. , Exhaust the heated gas.

このような硫酸製造設備１０は、さらに、硫酸を移送するための硫酸ラインを複数有している。具体的には、硫酸噴霧ノズル１ａから噴霧され充填層１ｂを通過し落下して乾燥塔１の底部に貯留された硫酸の一部を再び硫酸噴霧ノズル１ａに供給するための硫酸ラインＬ７と、同様にして乾燥塔１の底部に貯留された硫酸の一部を吸収塔３へ移送するための硫酸ラインＬ８と、硫酸噴霧ノズル３ａから噴霧され充填層３ｂを通過し落下して吸収塔３の底部に貯留された硫酸の一部を再び硫酸噴霧ノズル３ａに供給するための硫酸ラインＬ９と、同様にして吸収塔３の底部に貯留された硫酸の一部を乾燥塔１へ移送するための硫酸ラインＬ１０と、同様にして吸収塔３の底部に貯留された硫酸の一部を製品硫酸として外部へ搬送するための硫酸ラインＬ１１と、が設けられている。そして、硫酸ラインＬ７，Ｌ８及び硫酸ラインＬ９〜Ｌ１１には、各ラインにおける硫酸の流れを形成すべくポンプＰ１及びポンプＰ２がそれぞれ配設されている。   Such a sulfuric acid production facility 10 further includes a plurality of sulfuric acid lines for transferring sulfuric acid. Specifically, a sulfuric acid line L7 for supplying a part of sulfuric acid sprayed from the sulfuric acid spray nozzle 1a, passing through the packed bed 1b, falling and stored in the bottom of the drying tower 1 to the sulfuric acid spray nozzle 1a again, Similarly, a sulfuric acid line L8 for transferring a part of the sulfuric acid stored at the bottom of the drying tower 1 to the absorption tower 3 and the sulfuric acid spray nozzle 3a sprayed from the packed bed 3b and dropped and dropped. A sulfuric acid line L9 for supplying a part of sulfuric acid stored at the bottom to the sulfuric acid spray nozzle 3a again, and a part for transferring a part of sulfuric acid stored at the bottom of the absorption tower 3 to the drying tower 1 in the same manner. Similarly, a sulfuric acid line L10 and a sulfuric acid line L11 for conveying a part of the sulfuric acid stored at the bottom of the absorption tower 3 to the outside as product sulfuric acid are provided. The sulfuric acid lines L7 and L8 and the sulfuric acid lines L9 to L11 are respectively provided with a pump P1 and a pump P2 so as to form a flow of sulfuric acid in each line.

ここで、本実施形態の硫酸製造設備１０は、上記の構成に加えて、特に、オフガスラインＬ６とガスラインＬ１とに接続され吸収塔３から排出されるオフガスを乾燥塔１へ導入するための導入ラインＬ１００を備えている。この導入ラインＬ１００は、転化器２の昇温時に利用される。また、導入ラインＬ１００にはバルブＶ１が設けられており、ガスラインＬ１にはバルブＶ２が設けられている。   Here, in addition to the above configuration, the sulfuric acid production facility 10 of the present embodiment is particularly for introducing the off-gas connected to the off-gas line L6 and the gas line L1 and discharged from the absorption tower 3 into the drying tower 1. An introduction line L100 is provided. This introduction line L100 is used when the converter 2 is heated. The introduction line L100 is provided with a valve V1, and the gas line L1 is provided with a valve V2.

このようにして構成された硫酸製造設備１０によれば、転化器２の温度がＳＯ２をＳＯ３に転化可能な温度（例えば４００℃程度）にある通常運転時においては、バルブＶ１が閉とされると共にバルブＶ２が開とされ、ガスラインＬ１より乾燥塔１に新たな原料ガスが順次導入され、乾燥塔１に導入された原料ガスは、乾燥塔１で水分が硫酸に吸収されて除去され、熱交換器４及び熱交換器５で加熱され、転化器２でＳＯ２がＳＯ３に転化され、熱交換器４及び熱交換器５を加熱した後に、吸収塔３でＳＯ３が硫酸に吸収されて回収され、オフガスとして外部に放出される。これらの過程により、吸収塔３で高濃度の硫酸が製造される。また、乾燥塔１の硫酸の濃度を一定に保つべく、乾燥塔１で水分を吸収して濃度が低下した硫酸が硫酸ラインＬ８によって吸収塔３に送られると共に、吸収塔３でＳＯ３を吸収して濃度が高められた硫酸の一部が硫酸ラインＬ１０によって乾燥塔１に導入される。 According to the sulfuric acid production facility 10 configured as described above, during normal operation in which the temperature of the converter 2 is at a temperature (for example, about 400 ° C.) at which SO 2 can be converted to SO 3 , the valve V1 is closed. At the same time, the valve V2 is opened, new raw material gas is sequentially introduced into the drying tower 1 from the gas line L1, and the raw material gas introduced into the drying tower 1 is removed by moisture absorbed by sulfuric acid in the drying tower 1. And heated by the heat exchanger 4 and the heat exchanger 5, SO 2 is converted to SO 3 by the converter 2, and after heating the heat exchanger 4 and the heat exchanger 5, the SO 3 is sulfuric acid by the absorption tower 3. It is absorbed and recovered and released to the outside as off-gas. Through these processes, high-concentration sulfuric acid is produced in the absorption tower 3. Further, in order to keep the concentration of sulfuric acid in the drying tower 1 constant, sulfuric acid that has been absorbed by the drying tower 1 and reduced in concentration is sent to the absorption tower 3 by the sulfuric acid line L8, and SO 3 is absorbed by the absorption tower 3. Then, a part of the sulfuric acid whose concentration is increased is introduced into the drying tower 1 through the sulfuric acid line L10.

ここで、硫酸製造設備１０によれば、特に、その起動時であって転化器２の温度がＳＯ２をＳＯ３に転化可能な温度に達していない場合には、ガスラインＬ１より乾燥塔１に昇温用に所定量の原料ガスが導入され、この乾燥塔１に昇温用に導入された原料ガスは、乾燥塔１で水分が除去された後、一部が始動炉６に分岐導入されて加熱され、熱交換器４，５に通されたガスと合流し転化器２を通り、熱交換器４，５を通った後に吸収塔３へ導入されてオフガスラインＬ６へ排出される。 Here, according to the sulfuric acid production facility 10, in particular, when the temperature of the converter 2 does not reach a temperature at which the SO 2 can be converted into SO 3 at the time of starting, the drying tower 1 from the gas line L1. A predetermined amount of raw material gas is introduced into the drying tower 1 for raising the temperature, and the raw material gas introduced into the drying tower 1 is partially introduced into the starter furnace 6 after moisture is removed by the drying tower 1. Then, it is heated and merged with the gas passed through the heat exchangers 4 and 5, passes through the converter 2, passes through the heat exchangers 4 and 5, is introduced into the absorption tower 3, and is discharged to the off gas line L 6.

このとき、バルブＶ１が閉とされると共にバルブＶ２が開とされるため、吸収塔３より排出されたオフガスが、オフガスラインＬ６に接続された導入ラインＬ１００を介して再び乾燥塔１へ導入される。   At this time, since the valve V1 is closed and the valve V2 is opened, the offgas discharged from the absorption tower 3 is again introduced into the drying tower 1 through the introduction line L100 connected to the offgas line L6. The

即ち、硫酸製造設備１０によれば、起動時の転化器２の昇温時においては、乾燥塔１に昇温用に導入された所定量の原料ガスは、始動炉６（又は熱交換器４，５）、転化器２、熱交換器４，５、吸収塔３、導入ラインＬ１００、乾燥塔１の順に循環し、始動炉６（又は熱交換器４，５）を通る度に加熱され、この加熱されたガスが転化器２を繰り返し通ることにより、転化器２の昇温が行われる。そして、転化器２の温度がＳＯ２をＳＯ３に転化可能な温度に達すると、バルブＶ１が閉とされると共にバルブＶ２が開とされ、上記の通常運転に移行される。 That is, according to the sulfuric acid production facility 10, when the converter 2 is heated at the time of startup, a predetermined amount of the raw material gas introduced into the drying tower 1 for raising the temperature is supplied to the starter furnace 6 (or the heat exchanger 4). 5), the converter 2, the heat exchangers 4 and 5, the absorption tower 3, the introduction line L100, and the drying tower 1 are circulated in this order and heated each time passing through the starter furnace 6 (or the heat exchangers 4 and 5). The heated gas is repeatedly passed through the converter 2 to raise the temperature of the converter 2. When the temperature of the converter 2 reaches a temperature at which SO 2 can be converted to SO 3 , the valve V1 is closed and the valve V2 is opened, and the process proceeds to the normal operation.

以上説明したように、本実施形態の硫酸製造設備１０によれば、転化器２の昇温時には、乾燥塔１で水分が除去された後に転化器２を経て吸収塔３より排出されるオフガスが、導入ラインＬ１００によって再び乾燥塔１へ導入され、転化器２を昇温する間に乾燥塔１へ順次導入されるガスは水分が除去されたガスとなるため、転化器２を昇温する間に乾燥塔１の硫酸の濃度が低下することが抑制される。よって、転化器２を昇温する間に廃硫酸が製造されることが防止される。   As described above, according to the sulfuric acid production facility 10 of the present embodiment, when the temperature of the converter 2 is increased, the off-gas discharged from the absorption tower 3 through the converter 2 after moisture is removed by the drying tower 1 is reduced. The gas introduced into the drying tower 1 again by the introduction line L100 and sequentially introduced into the drying tower 1 while raising the temperature of the converter 2 becomes a gas from which moisture has been removed, so that the temperature of the converter 2 is raised. Further, the sulfuric acid concentration in the drying tower 1 is suppressed from decreasing. Therefore, it is prevented that waste sulfuric acid is produced while the converter 2 is heated.

なお、ガスラインＬ１には乾燥塔１へ大気を導入するためのガスラインＬ１２が接続されており、このガスラインＬ１２からガスラインＬ１を介して乾燥塔１へ導入される大気は、ＳＯ２をＳＯ３に転化する際に必要な酸素の供給源として転化器２へ供される。 A gas line L12 for introducing air to the drying tower 1 is connected to the gas line L1, and the air introduced from the gas line L12 to the drying tower 1 via the gas line L1 is SO 2 . This is supplied to the converter 2 as a supply source of oxygen necessary for the conversion to SO 3 .

また、上記実施形態においては、転化器２の昇温時に、ガスラインＬ１から昇温用に所定量の原料ガスが導入され循環される構成としたが、この原料ガスの代わりに、ガスラインＬ１２より大気が導入されて循環される構成としてもよいし、始動炉６から別のガスが導入されて循環される構成としてもよい。   In the above embodiment, when the temperature of the converter 2 is raised, a predetermined amount of source gas is introduced and circulated from the gas line L1 for raising the temperature. Instead of this source gas, the gas line L12 is used. A configuration in which the atmosphere is introduced and circulated may be adopted, or another gas may be introduced from the starter furnace 6 and circulated.

さらに、起動時以外の転化器２の昇温時においても、本発明を適用することができる。   Furthermore, the present invention can also be applied during the temperature rise of the converter 2 other than during startup.

１…乾燥塔、１ａ，３ａ…硫酸噴霧ノズル、１ｂ，３ｂ…充填層、２…転化器、３…吸収塔、４，５…熱交換器、６…始動炉、１０…硫酸製造設備、Ｌ１〜Ｌ５，Ｌ１２…ガスライン、Ｌ６…オフガスライン、Ｌ７〜Ｌ１１…硫酸ライン、Ｌ１００…導入ライン。
DESCRIPTION OF SYMBOLS 1 ... Drying tower, 1a, 3a ... Sulfuric acid spray nozzle, 1b, 3b ... Packing bed, 2 ... Converter, 3 ... Absorption tower, 4,5 ... Heat exchanger, 6 ... Start-up furnace, 10 ... Sulfuric acid production equipment, L1 L5, L12, gas line, L6, off gas line, L7, L11, sulfuric acid line, L100, introduction line.

Claims (1)

ＳＯ２を含むガス中の水分を硫酸に吸収させ除去し水分が除去されたガスを排出する乾燥塔と、前記乾燥塔より排出されるガスを導入し該ガス中のＳＯ２をＳＯ３に転化してＳＯ３を含有するガスを排出する転化器と、前記転化器より排出されるガスを導入し該ガス中のＳＯ３を硫酸に吸収させて回収する一方で、このＳＯ３が回収された後のオフガスを排出する吸収塔と、を備える硫酸製造設備において、
前記吸収塔から排出される前記オフガスを、前記転化器の昇温時に前記乾燥塔へ導入する導入ラインを備えることを特徴とする硫酸製造設備。


Moisture in the gas containing SO 2 is absorbed by sulfuric acid and removed, and a drying tower that discharges the gas from which moisture has been removed is introduced, and the gas discharged from the drying tower is introduced to convert SO 2 in the gas into SO 3 . Then, a converter that discharges a gas containing SO 3 and a gas discharged from the converter are introduced and SO 3 in the gas is absorbed and recovered by sulfuric acid, while this SO 3 is recovered. In a sulfuric acid production facility comprising an absorption tower that discharges off-gas later,
A sulfuric acid production facility comprising an introduction line for introducing the off-gas discharged from the absorption tower into the drying tower when the converter is heated.


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