M353203 八、新型說明： 【新型所屬之技術領域】 本實用新型涉及到變壓吸附製氤機，特別涉及到採用 多個吸附塔的變壓吸附製氮機。 【先前技術】 在本實用新型提出之前’以空氣為原料採用變壓吸附 鲁工藝的製氮機’包括兩個並聯的裝有吸附劑的吸附塔及相 應的附件。如圖1所示，吸附塔1 〇和20中裝有吸附劑， 且相互並行連接。各塔均帶有進氣閥門1〇1和201，產品 氮氣出口閥門102和202，解吸氣出口閥門1 〇3和203。 進氣閥門101和201 —端相互並聯且與進氣總閥3相連 接；產品氮氣出口閥門102和202 —端相互並聯且與產品 氮氣出口總閥門4相連接；解吸氣出口閥門】〇3和2〇3 一 #端相互並聯且與消音器5相連接；並聯後的進氣閥門1〇1 和201的另一端與後的解吸氣出口閥門1〇3和2〇3的另一 端也相互並聯，·吸附塔1和2之間還連接有吹掃閥門6。 製氮機開始運行前，將按照額定的工況要求（氮氣產 里’純度’ >1力狀態等）言十算出來的所需要的吸附劑裝填 在及附塔10中，並將同樣數量的吸附劑裝填在吸附塔 中:打開進氣總閥門3和吸附塔1Q的進氣閥門1Q1，壓縮 空氣11進入吸附塔10，在較高的麼力下，吸附塔進入 吸附階段，吸附劑吸附空氣中的氧氣，留下的氮氣22通過 M353203 吸附塔10的出口閥門102和出口總閥門4離開製氮機，被 送到使用位置。當吸附塔1〇中的吸附劑行將全部吸附著氧 氣時’立即進入均壓過程。此時，關閉進氣總閥門3和出 口總閥門4，並打開吸附塔20的進氣閥門201和出氣閥門 202’將吸附塔中的壓力勻入吸附塔2〇以迅速提高吸附 塔20的壓力。均壓時間極短。之後，立即打開進氣總閥門 3和出氣總閥門4，吸附塔20進入升壓和吸附過程。關閉 吸附塔10的進氣閥門1 〇1和出口閥門1 〇2，打開吸附塔 鲁10的解吸氣出口閥門103，通過消音器5向外界大氣釋放 壓力’被吸附塔10中的吸附劑所吸附的氧氣33同時被釋 放出去。隨後用吸附塔20所產生的帶壓力的少量氮氣通過 吹掃閥門6沖洗吸附塔1 〇，使吸附塔1 〇中的吸附劑完全 再生。這樣吸附塔10和吸附塔20交替進行吸附和再生， 可以連續制取氮氣。但是，製氮機必須在額定的工況下作 業，才能獲得符合要求的氮氣產量和氮氣純度。在氮氣產 魯量要求大幅度變化（例如在額定產量的20%〜1 〇〇%之間） 時，就會引起氮氣純度的變化。 儘管可以改變壓縮空氣的供給量來控制產氮量，但是 由下表可以看出氮氣的純度會隨著產氮量的減少而遞升， 離開額定工況的偏差值逐步增大。 M353203 產氮量Nm3/h 壓縮空氣耗量Nm3/h 氮氣純度％ 1000 2400 98.0 800 2340 99.1 600 2160 99.7 400 1880 99.95 200 1420 99.998 【新型内容】 本實用新型要解決的技術問題是克服現有技術中的不 足’提出一種新的變壓吸附製氮機。不僅可以在額定工況 下作業，也可以在產氮量波動較大情況下作業。既可以節 省壓縮空氣的耗量，又可以保持氮氣純度的穩定。M353203 VIII. New description: [New technical field] The utility model relates to a pressure swing adsorption boring machine, in particular to a pressure swing adsorption nitrogen generator using a plurality of adsorption towers. [Prior Art] Before the present invention was proposed, the nitrogen generator [using a pressure swing adsorption process using air as a raw material] includes two parallel adsorption towers equipped with an adsorbent and corresponding accessories. As shown in Fig. 1, the adsorption towers 1 and 20 are filled with adsorbents and connected to each other in parallel. Each tower has inlet valves 1〇1 and 201, product nitrogen outlet valves 102 and 202, and desorption gas outlet valves 1 〇3 and 203. The intake valves 101 and 201 are connected in parallel with each other and connected to the intake main valve 3; the product nitrogen outlet valves 102 and 202 are connected in parallel with each other and connected to the product nitrogen outlet main valve 4; the desorption gas outlet valve] 〇 3 And 2〇3一# terminal are connected in parallel with each other and connected to the muffler 5; the other end of the parallel intake valves 1〇1 and 201 and the other ends of the rear desorbing gas outlet valves 1〇3 and 2〇3 are also Parallel to each other, a purge valve 6 is also connected between the adsorption towers 1 and 2. Before the nitrogen generator starts to operate, the required adsorbent calculated in accordance with the rated working conditions (nitrogen production 'purity' > 1 force state, etc.) is loaded in the attached tower 10, and the same amount is The adsorbent is loaded in the adsorption tower: the intake main valve 3 and the intake valve 1Q1 of the adsorption tower 1Q are opened, and the compressed air 11 enters the adsorption tower 10. Under a higher force, the adsorption tower enters the adsorption stage, and the adsorbent adsorbs. The oxygen in the air, leaving the nitrogen gas 22 exiting the nitrogen generator through the outlet valve 102 of the M353203 adsorption column 10 and the outlet total valve 4, is sent to the use position. When the adsorbent line in the adsorption column 1 will all adsorb oxygen, it immediately enters the pressure equalization process. At this time, the intake total valve 3 and the outlet total valve 4 are closed, and the intake valve 201 and the outlet valve 202' of the adsorption tower 20 are opened to mix the pressure in the adsorption tower into the adsorption tower 2 to rapidly increase the pressure of the adsorption tower 20. . The pressure equalization time is extremely short. Immediately thereafter, the intake main valve 3 and the exhaust main valve 4 are opened, and the adsorption tower 20 enters the boosting and adsorption process. The intake valve 1 〇1 and the outlet valve 1 〇2 of the adsorption tower 10 are closed, the desorption gas outlet valve 103 of the adsorption tower 10 is opened, and the pressure is released to the outside atmosphere through the muffler 5 'the adsorbent in the adsorption tower 10 The adsorbed oxygen 33 is simultaneously released. Subsequently, the adsorption tower 1 is flushed by the purge valve 6 with a small amount of pressurized nitrogen gas generated by the adsorption tower 20, so that the adsorbent in the adsorption tower 1 is completely regenerated. Thus, the adsorption tower 10 and the adsorption tower 20 are alternately adsorbed and regenerated, and nitrogen gas can be continuously produced. However, the nitrogen generator must be operated under rated conditions to achieve the required nitrogen production and nitrogen purity. A change in nitrogen purity occurs when the nitrogen production requires a large change (for example, between 20% and 1% of the rated production). Although the amount of compressed air can be varied to control the amount of nitrogen produced, it can be seen from the table below that the purity of nitrogen will increase with the decrease in nitrogen production, and the deviation from the rated condition will gradually increase. M353203 Nitrogen production rate Nm3/h Compressed air consumption Nm3/h Nitrogen purity% 1000 2400 98.0 800 2340 99.1 600 2160 99.7 400 1880 99.95 200 1420 99.998 [New content] The technical problem to be solved by the utility model is to overcome the prior art Insufficient' proposes a new pressure swing adsorption nitrogen generator. It can be operated not only under rated conditions, but also under conditions of large fluctuations in nitrogen production. It not only saves the consumption of compressed air, but also keeps the purity of nitrogen stable.
本貫用新型是通過以下的技術措施來實現的。多塔變 壓吸附製氮機，包括進氣總閥’相互平行連接後與進氣她 閥連接的吸附塔組進氣閥；產品氮氣出口總閥，相互平： 連接後與產品氮氣出σ總閥連接的吸附塔組產品氮氣出口 :::音，相互平行連接後與消音器連接的吸附塔組解 =^閥；吸附塔組進氣閥的另—端與吸附塔组解 閥的另-端也相互並聯；連接吸附塔組 _ =兩個並行連接的吸附塔組;在各個吸附塔上括口 (、個的並仃連接的吸附塔；各個 分別連接進氣分閥的-端和產品氮氣出口分= 7 M353203 ^刀閥的另一端相互並行連接後與吸附塔組進氣閥的另一 鳊連接，產品氮氣出口分閥的另一端相互並行連接與吸附 塔組產品氮氣出口閥的另一端連接。 所述的吸附塔組内包括三個的並行連接的吸附塔。 所述的吸附塔組内至少有一個吸附塔的進口和出口不 連接進氣分閥和產品氮氣出口分閥。 夕。變壓吸附製氮機’包括兩個並行連接的吸附塔 鲁組，在所述的各個吸附塔組中包括不少於一個的並行連接 的及附塔，所述的各個吸附塔的進口和出口分別連接進氣 分閥的一端和產品氮氣出口分閥的一端；而且至少有一個 所述的吸附塔的進口和出口不連接進氣分閥和產品氮氣出 口分閥。所述的進氣分閥的另一端（包括無進氣分閥的吸 附塔）相互並行連接後並與吸附塔組進氣閥的一端連接； 繼後所述的吸附塔組進氣閥的另一端與進氣總閥連接。所 述的產品氮氣出口分閥的另一端（包括無產品氮氣出口分 •閥的吸附塔）相互並行連接後並與吸附塔組產品氮氣出口 閥的一端連接；繼後所述的吸附塔組產品氮氣出口閥的另 一端與產品氮氣出口總閥連接。各個吸附塔組解吸氣出口 .閥相互並聯後與所述的消音器相連接；所述的吸附塔組進 氣閥的一端與所述的吸附塔組解吸氣出口閥的另一端也相 互並聯。所述的製氮機内還有連接兩個吸附塔組的吹掃閥。 在所述的製氮機開始運作前，按照額定的工況要求/氮 氣產量，純度’麼力狀態等）計算出來的所需要的吸附劑& 將吸附劑分別裝載到一個所述的吸附塔組的各個所述的吸 M353203 附塔内，相同數量的吸附劑同樣裝載到另一個所述的吸附 塔組的各個所述的吸附塔内。打開所述的進氣總閥和一個 所述的吸附塔組的進氣閥以及所述的吸附塔組内的與所述 的吸附塔相連接的所述的進氣分閥，壓縮空氣進入該所述 的吸附塔組，在較南的壓力下’所述的吸附塔組進入吸附 階段，吸附劑吸附空氣中的氧氣’留下的氮氣通過所述的 吸附塔的所述的產品氮氣出口分閥、所述的吸附塔組的所 述的產品氮氣出口閥和產品氮氣出口總閥離開製氮機，被 送到使用位置。當所述的吸附塔中的吸附劑行將全部吸附 著氧氣時，所述的吸附塔組立即進入均壓階段。此時關閉 進氣總閥和出口總閥，並打開另一個所述的吸附塔組的進 氣閥和進氣分閥，氮氣出口閥和氮氣出口分閥將前一個所 述的吸附塔組的壓力均壓到後一個所述的吸附塔組，以迅 速提高後一個所述的吸附塔組的壓力。然後，打開進氣總 閥和氮氣出口總閥，後一個所述的吸附塔組進入升壓和吸 附過程，關閉前一個所述的吸附塔組的進氣閥和出口閥。 打開前一個所述的吸附塔組及前一個所述的吸附塔組内的 所述的吸附塔的解吸氣出口閥，通過消音器向外界大氣釋 放壓力，所述的被前一個所述的吸附塔中的吸附劑所吸附 的氧氣被釋放出去。利用兩吸附塔組之間的吹掃閥，用後 一個所述的吸附塔組所產生的帶壓力的少量氮氣沖洗前一 ，所述的吸附塔組，使前一個所述的吸附塔組中的吸附劑 完全再生。這樣前一個所述的吸附塔組和後一個所述的吸 附塔組交替進行吸附和再生，可以連續制取氮氣。 9 M353203 一但氮氣產量要求大幅度變化時，只要相應地改變所 述的吸附塔組内所述的吸附塔使用個數。例如氮氣產量要 求降低到額定工況的三分之一時，相應地只要使用所述的 吸附塔組内一個所述的吸附塔，就能使氮氣產量和氮氣純 度均滿足要求。同樣氮氣產量要求降低到額定工況的三分 之二時，也只要使用兩個所述的吸附塔就行了。 本發明實用新型採用上述技術措施後，除了具備製氮 機工藝簡單，設備投資少；常溫作業，能耗低等優點外， 在產氮置有較大波動的情況下，既可以大大減少壓縮空氣 的耗量，降低了能耗；又可以保持氮氣純度的穩定，實現 產品工況（氮氣產量，純度，壓力狀態等）穩定的目標。 【實施方式】 下面結合附圖和實施例對本發明實用新型作進一步說 明。 多塔變壓吸附製氮機，如圖2所示，包括兩個並行連 接的吸附塔組A和B。在吸附塔組A中包括三個的並行連 接的吸附塔A1、A2、A3 ;在吸附塔組B中也包括三個的 並行連接的吸附塔B1、B2、B3。吸附塔A1和A3的進口 和出口分別連接進氣分閥1012和1013的一端和產品氮氣 出口分閥1022和1023的一端；吸附塔B1和B3的進口和 出口也連接進氣分閥2012和2013的一端和產品氮氣出口 分閥2022和2023的一端。進氣分閥1012和1〇13的另一 端與吸附塔A2的進口相互並行連接後與吸附塔組a進氣閥 10 M353203 1011的一端連接；進氣分閥2012和2013的另一端與吸附 塔B2的進口相互並行連接後與吸附塔組B進氣閥2011的 一端連接。繼後吸附塔組A的進氣閥1〇11的另一端與吸附 塔組B的進氣閥2011的另一端共同與進氣總閥3連接。產 品氮氣出口分閥1022和1023的另一端與吸附塔A2的產 品氮氣出口相互並行連接後與吸附塔組A產品氮氣出口閥 1021的一端連接；產品氮氣出口分閥2022和2023的另一 端與吸附塔B2的產品氮氣出口相互並行連接後與吸附塔 鲁組B產品氮氣出口閥2021的一端連接，繼後吸附塔組a 的產品氮氣出口閥1021的另一端與吸附塔組B的產品氮氣 出口閥2021的另一端共同與產品氮氣出口總閥4連接。吸 附塔組A的進氣閥1011的一端與吸附塔組a的解吸氣出 口閥1031的一端相互連接；吸附塔組B的進氣閥2〇11的 一端與吸附塔組B的解吸氣出口閥2〇31的一端相互連接。 吸附塔組A的解吸氣出口閥1〇31與吸附塔組B的解吸氣 眷出口閥2〇31相互連接後與消音器5相連接。製氮機内還有 連接吸附塔組A和吸附塔組B的吹掃閥6。 . 在所述的製氮機開始運作前，按照額定的工況要求（氮 氣產量，純度’壓力狀態等）計算出來的所需要的吸附劑， 將吸附劑分別|載到吸附塔組A的各個吸附塔A卜Μ和 A+3内相同數置的吸附劑同樣裝載到吸附塔組的各個吸附 ° # 3内打開進氣總閥3和吸附塔組A的進氣 ，1011以及吸附塔組A内的與吸附塔A卜A3相連接的進 虱'刀閥1〇12、1013，麼縮空氣11進入吸附塔組A，在較 M353203 尚的壓力下，吸附塔組A進入吸附階段，吸附劑吸附空氣 中的氧氣’留下的氮氣22通過吸附塔A1、A3的產品氮氣 出口分閥1022、1023、吸附塔組A產品氮氣出口閥1 〇21 和產品氮氣出口總閥4離開製氮機，被送到使用位置。當 吸附塔A1、A2和A3中的吸附劑行將全部吸附著氧氣時， 立即進入均壓過程。此時，關閉進氣總閥3和出氣總閥4， 打開另一個吸附塔組B的進氣閥2011、出氣閥2021和吸 鲁附塔B1、B3的進氣分閥2012、2013，出氣分閥2022、 2023。將吸附塔組A中的壓力均壓入吸附塔組b以迅速提 高吸附塔組B中吸附塔B1、B2和B3的壓力。之後，打開 進氣總閥3和出口總閥4，吸附塔組B中的吸附塔B1、B2、 B3都進入升壓和吸附過程，關閉吸附塔組a的進氣閥彳Q1) 和產品氮氣出口閥1021。打開吸附塔組A的解吸氣出口閥 1031，通過消音器5向外界大氣釋放壓力，被吸附塔A1、 A2和A3中的吸附劑所吸附的氧氣33同時被釋放出去。最 •後由吸附塔組A和吸附塔組B之間的吹掃閥6，用吸附塔 組B所產生的帶壓力的少量氮氣沖洗吸附塔組A，使吸附 •塔組A中吸附塔A1、A2和A3内的吸附劑完全再生。這樣 吸附塔組A和吸附塔組B交替進行吸附和再生，可以連續 制取氮氣。 ' 一但氮氣產量要求大幅度變化時’只要相應地改變吸 附塔組A和吸附塔組B内吸附塔使用個數。例如氮氣產量 要求降低到額定工況的三分之一時，相應地只要使用吸附 塔組内一個吸附塔，就能使氮氣產量和氮氣純度均滿足要 12 M353203 求。同樣氮氣產量要求降低到額定工況的三分之二時，也 只要使用兩個所述的吸附塔就行了。以額定工況為1000 NM3/h，氮氣純度為98〜99.5%為例，當產氮量在670〜 1000 NM3/h時，吸附塔組A和吸附塔組B中的吸附塔全部 投入運行，既能保證氮氣產量，又能保證氮氣純度在規定 的範圍内。當產氮量在330〜670NM3/h時，吸附塔組A和 吸附塔組B中的各有兩個吸附塔投入運行，既能保證氮氣 產量，又能保證氮氣純度在規定的範圍内，壓縮空氣用量 也有所減少。當產氮量在330NM3/h以下時，只需要吸附塔 組A和吸附塔組B中的一個吸附塔投入運行，氮氣產量和 氮氣純度均在規定的範圍内，壓縮空氣用量更有所減少。 從下表中可以看出：採用本實用新型的技術方案後，隨著 產氮量的變化，不但壓縮空氣用量隨之變化，氮氣純度很 少偏離規定值。 產氮量Nm3/h 壓縮空氣耗量Nm3/h 氮氣純度％ 1000 2400 98.0 800 2340 99.1 600 1600 98.6 400 1250 99.3 200 625 99.3The new type of use is achieved through the following technical measures. Multi-column pressure swing adsorption nitrogen generator, including the intake manifold valve's parallel connection with the inlet tower valve of the adsorption tower connected to the inlet valve; the product nitrogen outlet total valve, flat: after the connection with the product nitrogen σ total The valve is connected to the adsorption tower group product nitrogen outlet::: sound, parallel to each other and connected to the silencer connected to the adsorption tower group solution = ^ valve; the other end of the adsorption tower group intake valve and the adsorption tower group to solve the valve - The ends are also connected in parallel with each other; the adsorption tower group is connected _ = two adsorption tower groups connected in parallel; the adsorption towers are connected to each adsorption tower (the adsorption towers connected to each other; the respective ends and products respectively connected to the inlet manifold) Nitrogen outlet points = 7 M353203 ^The other ends of the knife valves are connected in parallel with each other and connected to the other side of the intake valve of the adsorption tower group. The other end of the product nitrogen outlet branch valve is connected in parallel with each other and the nitrogen outlet valve of the adsorption tower group product. The adsorption tower group includes three adsorption towers connected in parallel. The inlet and outlet of at least one adsorption tower in the adsorption tower group are not connected to the inlet valve and the product nitrogen outlet valve. Pressure swing adsorption nitrogen production 'Includes two parallel-connected adsorption towers, including not less than one parallel connected and attached towers in each of the adsorption tower groups, and the inlets and outlets of the respective adsorption towers are respectively connected to the intake manifold One end of the product and one end of the product nitrogen outlet valve; and at least one of the inlet and outlet of the adsorption tower is not connected to the inlet manifold and the product nitrogen outlet manifold. The other end of the inlet manifold (including none The adsorption towers of the intake manifold are connected in parallel with each other and connected to one end of the intake valve of the adsorption tower group; and the other end of the intake valve of the adsorption tower group is connected to the intake main valve. The other end of the outlet valve (including the adsorption tower of the product-free nitrogen outlet branch/valve) is connected in parallel with each other and connected to one end of the nitrogen outlet valve of the adsorption tower group product; followed by the nitrogen outlet valve of the adsorption tower group product One end is connected to the product nitrogen outlet main valve. Each adsorption tower group desorbs the gas outlet. The valves are connected in parallel with each other and connected to the muffler; one end of the adsorption tower group intake valve and the adsorption tower group The other ends of the desorption gas outlet valve are also connected in parallel with each other. The nitrogen generator also has a purge valve connecting the two adsorption tower groups. Before the nitrogen generator starts operating, according to the rated working condition requirement / nitrogen gas Yield, purity 'mould force state, etc.' Calculated required adsorbent & The adsorbent is separately loaded into each of the suction M353203 attached towers of one of the adsorption tower groups, and the same amount of adsorbent is also loaded To each of the adsorption columns of the other adsorption column set described. Opening an intake manifold valve and an intake valve of the adsorption tower group and the intake manifold valve connected to the adsorption tower in the adsorption tower group, and the compressed air enters the In the adsorption tower group, the adsorption tower group enters the adsorption stage under a relatively south pressure, and the adsorbent adsorbs nitrogen in the air to leave nitrogen gas passing through the product outlet of the adsorption tower. The valve, the product nitrogen outlet valve of the adsorption tower set, and the product nitrogen outlet total valve exit the nitrogen generator and are sent to the use position. When the adsorbent line in the adsorption column will all adsorb oxygen, the adsorption tower group immediately enters the pressure equalization stage. At this time, the intake main valve and the outlet main valve are closed, and the intake valve and the intake sub-valve of the other adsorption tower group are opened, and the nitrogen outlet valve and the nitrogen outlet sub-valve will be the former one of the adsorption tower groups. The pressure is equalized to the latter set of adsorption towers to rapidly increase the pressure of the latter set of adsorption towers. Then, the intake manifold valve and the nitrogen outlet master valve are opened, and the latter adsorption tower group enters the boosting and adsorption process, and the intake valve and the outlet valve of the previously described adsorption tower group are closed. Opening a desorption gas outlet valve of the adsorption tower of the preceding one and the adsorption tower of the preceding one, and releasing the pressure to the outside atmosphere through the muffler, said The oxygen adsorbed by the adsorbent in the adsorption tower is released. Utilizing a purge valve between the two adsorption tower sets, flushing the previous one with the small amount of pressurized nitrogen gas generated by the latter adsorption tower group, so that the adsorption tower group is in the previous adsorption tower group The adsorbent is completely regenerated. Thus, the adsorption tower group described above and the latter adsorption tower group are alternately adsorbed and regenerated, and nitrogen gas can be continuously produced. 9 M353203 Once the nitrogen production requirements vary widely, simply change the number of adsorption towers used in the adsorption tower group accordingly. For example, when the nitrogen production requirement is reduced to one-third of the rated condition, the nitrogen production and the nitrogen purity can be satisfied by using only one of the adsorption towers in the adsorption tower group. Similarly, when the nitrogen production requirement is reduced to two-thirds of the rated condition, it is only necessary to use two of the adsorption towers described above. After adopting the above technical measures, the utility model has the advantages of simple process of nitrogen generator, less equipment investment, low temperature operation, low energy consumption, etc., and can greatly reduce compressed air in the case of large fluctuations in nitrogen production. The consumption reduces the energy consumption; it can also maintain the stability of nitrogen purity and achieve the goal of stable product conditions (nitrogen production, purity, pressure state, etc.). [Embodiment] Hereinafter, the present invention will be further described with reference to the accompanying drawings and embodiments. The multi-column pressure swing adsorption nitrogen generator, as shown in Figure 2, includes two adsorption tower groups A and B connected in parallel. In the adsorption column group A, three parallel adsorption columns A1, A2, and A3 are included; and in the adsorption column group B, three parallel adsorption columns B1, B2, and B3 are also included. The inlets and outlets of the adsorption towers A1 and A3 are respectively connected to one end of the inlet manifold valves 1012 and 1013 and one end of the product nitrogen outlet branch valves 1022 and 1023; the inlets and outlets of the adsorption towers B1 and B3 are also connected to the inlet manifold valves 2012 and 2013. One end and one end of the product nitrogen outlet manifolds 2022 and 2023. The other ends of the intake manifolds 1012 and 1〇13 are connected in parallel with the inlets of the adsorption tower A2, and are connected to one end of the intake tower group 10 intake valve 10 M353203 1011; the other ends of the intake manifolds 2012 and 2013 and the adsorption tower The inlets of B2 are connected in parallel to each other and are connected to one end of the adsorption tower group B intake valve 2011. The other end of the intake valve 1〇11 of the subsequent adsorption tower group A is connected to the intake main valve 3 together with the other end of the intake valve 2011 of the adsorption tower group B. The other ends of the product nitrogen outlet sub-valves 1022 and 1023 are connected in parallel with the product nitrogen outlets of the adsorption tower A2, and are connected to one end of the adsorption tower group A product nitrogen outlet valve 1021; the other end of the product nitrogen outlet sub-valves 2022 and 2023 are adsorbed. The product nitrogen outlets of the column B2 are connected in parallel to each other and then connected to one end of the nitrogen gas outlet valve 2021 of the adsorption tower group B product, and then the other end of the product nitrogen outlet valve 1021 of the adsorption tower group a and the product nitrogen outlet valve of the adsorption tower group B. The other end of 2021 is commonly connected to the product nitrogen outlet main valve 4. One end of the intake valve 1011 of the adsorption tower group A and one end of the desorption gas outlet valve 1031 of the adsorption tower group a are connected to each other; one end of the intake valve 2〇11 of the adsorption tower group B and the desorption gas of the adsorption tower group B One ends of the outlet valves 2〇31 are connected to each other. The desorbing gas outlet valve 1〇31 of the adsorption tower group A and the desorption gas outlet valve 2〇31 of the adsorption tower group B are connected to each other and connected to the muffler 5. The nitrogen generator also has a purge valve 6 that connects the adsorption tower group A and the adsorption tower group B. Before the nitrogen generator starts to operate, the required adsorbents calculated according to the rated working conditions (nitrogen production, purity 'pressure state, etc.) are respectively loaded to the adsorption tower group A. The same number of adsorbents in the adsorption tower A and A+3 are also loaded into the adsorption column #3 of the adsorption tower group to open the intake manifold 3 and the adsorption tower group A, 1011 and the adsorption tower group A. The inlet 虱 'knife valve 1 〇 12, 1013 connected to the adsorption tower A A A3, the air 11 enters the adsorption tower group A, and under the pressure of M353203, the adsorption tower group A enters the adsorption stage, the adsorbent The nitrogen gas 22 adsorbed by the oxygen in the air exits the nitrogen generator through the product nitrogen outlet valves 1022, 1023 of the adsorption towers A1, A3, the nitrogen outlet valve 1 〇 21 of the adsorption tower group A product, and the product nitrogen outlet total valve 4. Was sent to the use location. When the adsorbent lines in the adsorption columns A1, A2 and A3 will all adsorb oxygen, they immediately enter the pressure equalization process. At this time, the intake total valve 3 and the outlet total valve 4 are closed, and the intake valve 2011, the outlet valve 2021 of the other adsorption tower group B, and the intake manifold valves 2012 and 2013 of the suction towers B1 and B3 are opened, and the air outlet is divided. Valves 2022, 2023. The pressure in the adsorption column group A was uniformly injected into the adsorption column group b to rapidly increase the pressures of the adsorption columns B1, B2 and B3 in the adsorption column group B. After that, the intake main valve 3 and the outlet main valve 4 are opened, and the adsorption towers B1, B2, and B3 in the adsorption tower group B enter the pressure increasing and adsorption process, and the intake valve 彳Q1) of the adsorption tower group a and the product nitrogen are closed. The outlet valve 1021. The desorbing gas outlet valve 1031 of the adsorption tower group A is opened, and the pressure is released to the outside atmosphere through the muffler 5, and the oxygen 33 adsorbed by the adsorbent in the adsorption towers A1, A2 and A3 is simultaneously released. Finally, the adsorption tower 6 between the adsorption tower group A and the adsorption tower group B is used to flush the adsorption tower group A with a small amount of pressurized nitrogen gas generated by the adsorption tower group B, so that the adsorption tower A1 in the adsorption tower group A The adsorbents in A2 and A3 are completely regenerated. Thus, the adsorption tower group A and the adsorption tower group B are alternately adsorbed and regenerated, and nitrogen gas can be continuously produced. 'When the nitrogen production requires a large change', the number of adsorption towers in the adsorption tower group A and the adsorption tower group B is changed accordingly. For example, when the nitrogen production requirement is reduced to one-third of the rated condition, the nitrogen production and nitrogen purity can be satisfied by using only one adsorption tower in the adsorption tower group. When the nitrogen production requirement is reduced to two-thirds of the rated condition, it is only necessary to use two of the adsorption towers described above. Taking the rated working condition as 1000 NM3/h and the nitrogen purity as 98~99.5% as an example, when the nitrogen production is 670~1000 NM3/h, the adsorption towers in the adsorption tower group A and the adsorption tower group B are all put into operation. It not only ensures nitrogen production, but also ensures that the purity of nitrogen is within the specified range. When the nitrogen production rate is 330~670NM3/h, two adsorption towers in the adsorption tower group A and the adsorption tower group B are put into operation, which can ensure the nitrogen production and ensure the purity of the nitrogen within the specified range. Air usage has also decreased. When the nitrogen production is below 330 NM3/h, only one adsorption tower in the adsorption tower group A and the adsorption tower group B is required to be put into operation, and the nitrogen production and the nitrogen purity are within the prescribed ranges, and the compressed air consumption is further reduced. It can be seen from the following table that after using the technical scheme of the present invention, as the amount of nitrogen produced changes, not only the amount of compressed air changes, but also the purity of nitrogen deviates from the specified value. Nitrogen production Nm3/h Compressed air consumption Nm3/h Nitrogen purity% 1000 2400 98.0 800 2340 99.1 600 1600 98.6 400 1250 99.3 200 625 99.3
以上所述的僅是本實用新型的優選實施方式。應當指 出，對於本領域的普通技術人員來說，在不脫離本實用新 13 M353203 型原理的前提下，還可以做出若干變型和改進，這些也應 視為屬於本實用新型的保護範圍。 【圖式簡單說明】 圖1為現有技術中的製氮機示意圖； 圖2為本實用新型實施例的示意圖。 【主要元件符號說明】 10為吸附塔之一，20為吸附塔之二，1〇1、201分別為 吸附塔10和20的進氣閥門，1〇2、202分別為吸附塔1〇 和20的產品氮氣出口閥門，103、203分別為吸附塔1〇和 20的解吸氣出口閥門；3為進氣總閥，4為產品氮氣出口 總閥門’ 5為消音器’ 6為吹掃閥’ 11為壓縮空氣，22為 產品氮氣，33為解吸氣（氧氣）。 A為吸附塔組之一，B為吸附塔組之二，A1，A2，A3 •為吸附塔組A中的吸附塔，B1，B2，B3為吸附塔組B中 的吸附塔。彳〇11、2011分別為吸附塔組A和B的進氣閥， • 1〇21、2021分別為吸附塔組A和B的產品氮氣出口閥， 1031、2031分別為吸附塔組A和B的解吸氣出口閥； 1012、1013分別為吸附塔組A中吸附塔A〗，A3的進氣分 閥，2012、201 3分別為吸附塔組b中吸附塔b 1，B3的進 氣为閥，1022、1023分別為吸附塔組a中吸附塔A1，A3 的產品氮氣出口分閥，2022、2023分別為吸附塔組B中吸 附塔B1 ’ B3的產品氮氣出口分閥。 14What has been described above is only a preferred embodiment of the present invention. It should be noted that a number of variations and modifications can be made by those skilled in the art without departing from the spirit of the present invention, and these should also be considered as the scope of protection of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a nitrogen generator in the prior art; FIG. 2 is a schematic view of an embodiment of the present invention. [Description of main components] 10 is one of the adsorption towers, 20 is the second of the adsorption towers, 1〇1 and 201 are the inlet valves of the adsorption towers 10 and 20, respectively, and 1〇2 and 202 are adsorption towers 1〇 and 20, respectively. The product is a nitrogen outlet valve, 103, 203 are the desorption gas outlet valves of the adsorption towers 1 and 20, respectively; 3 is the intake total valve, 4 is the product nitrogen outlet total valve '5 is the muffler' 6 is the purge valve' 11 is compressed air, 22 is product nitrogen, and 33 is desorbed gas (oxygen). A is one of the adsorption towers, B is the second of the adsorption towers, A1, A2, A3. • is the adsorption tower in the adsorption tower group A, and B1, B2, and B3 are the adsorption towers in the adsorption tower group B.彳〇11, 2011 are the intake valves of the adsorption tower groups A and B respectively. • 1〇21, 2021 are the product nitrogen outlet valves of the adsorption tower groups A and B respectively, and 1031 and 2031 are the adsorption tower groups A and B respectively. Desorbing gas outlet valve; 1012, 1013 are adsorption tower A in adsorption tower group A, inlet valve of A3, 2012, 201 3 are adsorption towers of adsorption tower b 1, B3 in adsorption tower group b respectively. , 1022, 1023 are respectively the product nitrogen outlets of the adsorption towers A1 and A3 in the adsorption tower group a, and the 2022 and 2023 are respectively the product nitrogen outlet valves of the adsorption tower B1 'B3 in the adsorption tower group B. 14