常溫、常壓下的空氣經(jīng)空氣過(guò)濾器過(guò)濾后，由電動(dòng)鼓風(fēng)機(jī)組、蒸汽透平機(jī)驅(qū)動(dòng)的鼓風(fēng)機(jī)組壓縮，再經(jīng)空氣加熱器加熱一定溫度。正丁烷液體經(jīng)輸送泵加壓后送入到正丁烷蒸發(fā)罐，然后使用正丁烷蒸發(fā)器使其汽化，再經(jīng)正丁烷過(guò)熱器加熱一定溫度。過(guò)熱的正丁烷氣與空氣混合成一定濃度反應(yīng)氣體進(jìn)入立式管/殼型反應(yīng)器中，在反應(yīng)器殼程中采用熔鹽混合物通過(guò)熔鹽泵往復(fù)循環(huán)用作冷卻介質(zhì)；反應(yīng)氣體進(jìn)入管程在催化劑的作用下進(jìn)行氧化反應(yīng)，反應(yīng)過(guò)程中加入助催化劑。反應(yīng)熱通過(guò)熔鹽移走，部分熔鹽經(jīng)過(guò)熔鹽冷卻器的殼程，通過(guò)與熔鹽冷卻器管的鍋爐水換熱產(chǎn)生蒸汽并使其冷卻。
The air at room temperature and pressure is filtered by an air filter, compressed by an electric blower unit or a steam turbine driven blower unit, and then heated to a certain temperature by an air heater. The n-butane liquid is pressurized by a delivery pump and sent to the n-butane evaporation tank. It is then vaporized using a n-butane evaporator, and then heated to a certain temperature through a n-butane superheater. The superheated n-butane gas is mixed with air to form a certain concentration of reaction gas and enters a vertical tube/shell reactor. In the shell side of the reactor, the molten salt mixture is used as a cooling medium through reciprocating circulation through a molten salt pump; The reaction gas enters the tube side and undergoes an oxidation reaction under the action of a catalyst, during which a co catalyst is added. The reaction heat is removed through molten salt, and a portion of the molten salt passes through the shell side of the molten salt cooler, generating steam and cooling it by exchanging heat with the boiler water in the molten salt cooler tube.
反應(yīng)器溫度靠控制流經(jīng)熔鹽冷卻器的熔鹽流量進(jìn)行控制。反應(yīng)后的熱反應(yīng)氣體經(jīng)氣體冷卻器和切換冷卻器管程冷卻之后送吸收工序。氣體冷卻器和切換冷卻器殼程中的鍋爐水被加熱并部分氣化，和熔鹽冷卻器中產(chǎn)生的蒸汽在蒸汽包中分離出來(lái)或過(guò)熱后供裝置內(nèi)蒸汽透平機(jī)及其它用戶做為熱源使用。
The temperature of the reactor is controlled by controlling the flow rate of molten salt flowing through the molten salt cooler. The hot reaction gas after reaction is sent to the absorption process after being cooled by the gas cooler and the switching cooler tube side. The boiler water in the shell side of the gas cooler and switching cooler is heated and partially gasified, and the steam generated in the molten salt cooler is separated or overheated in the steam drum for use as a heat source by the steam turbine and other users in the device.
在反應(yīng)器進(jìn)料系統(tǒng)中設(shè)有增濕系統(tǒng)和助劑添加系統(tǒng)以保證催化劑的轉(zhuǎn)化率和選擇性。增濕系統(tǒng)是通過(guò)調(diào)節(jié)低壓蒸汽加入量以達(dá)到工藝要求；助劑添加是通過(guò)氮?dú)夤呐莘椒尤氲竭^(guò)熱正丁烷氣體中。
There is a humidification system and an additive addition system in the reactor feed system to ensure the conversion rate and selectivity of the catalyst. The humidification system achieves process requirements by adjusting the amount of low-pressure steam added; Additives are added to superheated n-butane gas through nitrogen bubbling method.
由于順酐吸收過(guò)程和冷凝過(guò)程在同一時(shí)間發(fā)生，在氣相流股被冷卻時(shí)，順酐絕大部分被從氣體中移走。為了使這一過(guò)程的熱量被全部移出同時(shí)維持一個(gè)較低的貧溶劑流量，吸收塔下部塔盤(pán)在一個(gè)帶冷卻循環(huán)回路的直聯(lián)式冷卻器條件下操作。從塔下部上升的氣體被冷卻后在塔內(nèi)部塔盤(pán)得到有效吸收，在吸收塔內(nèi)，富氣從塔底進(jìn)入并上升，同時(shí)貧溶劑從塔頂進(jìn)入，富溶劑用吸收塔循環(huán)泵一部分輸送到吸收塔循環(huán)，另一部分輸送到富溶劑貯罐，吸收塔頂排出的尾氣送到尾氣處理系統(tǒng)。
Due to the fact that the absorption and condensation processes of maleic anhydride occur at the same time, the vast majority of maleic anhydride is removed from the gas when the gas-phase stream is cooled. In order to remove all the heat from this process while maintaining a low flow rate of lean solvent, the lower tray of the absorption tower is operated under the condition of a direct connected cooler with a cooling circulation circuit. The gas rising from the bottom of the tower is cooled and effectively absorbed on the internal tray of the tower. In the absorption tower, rich gas enters and rises from the bottom of the tower, while lean solvent enters from the top of the tower. Part of the rich solvent is transported to the absorption tower for circulation by the absorption tower circulation pump, and the other part is transported to the rich solvent storage tank. The exhaust gas discharged from the top of the absorption tower is sent to the tail gas treatment system.
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