化工離心泵的特性有哪些

由于化工消費對泵的特殊請求，化工離心泵與其他離心泵相比有以下幾個特性：

(1)能順應化工工藝需求：泵在化工消費中，不但要保送液體物料并提供工藝請求的必要壓力，還必需保證保送的物料量，在一定的化工單元操作中，請求泵的流量和揚程要穩定，堅持泵高效率牢靠運轉。

(2)耐腐蝕：化工泵保送的介質，包括原料、反響中間物等常常多為腐蝕性介質。這就請求泵的資料選擇恰當和合理，保證泵的平安、穩定、短命命運轉。

(3)耐高溫、低溫：化工泵保送的高溫介質，有流程液體物料，也有反響過程所需求和產生的載熱液體。例如：冷凝液泵、鍋爐給水泵、導熱油泵?；け帽Ｋ偷牡蜏亟橘|品種也很多，

(4)耐磨損、耐沖刷：由于化工泵保送的物流中含有懸浮固體顆粒，同時泵的葉輪、腔體也有的在高壓高流速下工作，泵的零部件外表維護層被毀壞，其壽命較短，所以必需進步化工泵的耐磨性、耐沖刷性，這就請求泵的資料選用耐磨的錳鋼、陶瓷、鑄鐵等，選用耐沖刷的鈦材、錳鋼等。

(5)運轉牢靠：化工泵的運轉牢靠包括兩個含義：一是長周期運轉不出毛病;二是運轉中各種參數平穩。運轉的牢靠性對化工消費至關重要。若泵經常發作毛病，不只會形成經常停產，影響產量和經濟效益，而且有時還可能形成化工系統的事故?；け棉D速的動搖，會惹起流量及泵出口壓力的動搖，使化工消費不能正常停止或系統中的反響遭到影響，物料不能均衡，不只形成糜費，以至形成產質量量降落或使產品報廢。

(6)無走漏或少走漏：化工泵保送的介質多數為易燃、易爆、有毒、有害的液體，一旦走漏將嚴重污染環境，危及人身平安和職工的身心安康，更不契合無走漏工廠和清潔文化工廠的請求，這就必需保證化工泵運轉時不走漏，在泵的密封上采用新技術、新資料，按規程操作，高質量檢修。

(7)能保送臨界狀態的液體：臨界狀態的液體，當溫度升高或壓力降低時，常常會汽化?；け糜袝r保送臨界狀態的液體，一旦液體在泵內汽化，則易于產生氣蝕毀壞，這就請求泵具有較高的抗氣蝕性能。同時，液體的汽化，可能惹起泵內動靜局部的摩擦膠合，這就請求有關間隙取大一些。為了防止由于液體的汽化使機械密封、填料密封、迷宮密封等因干摩擦而毀壞，這類化工泵必需有將泵內發作的氣體充沛掃除的構造。

the pump is a kind of machinery to stop the liquid transportation. the chemical centrifugal pump is one of them. it makes the liquid flowing through the impeller suffer the centripetal force through the impeller, and improves the mechanical energy of the liquid, so as to stop the liquid transportation. it is a machine to increase the liquid energy.

due to the special requirements of chemical consumption for pumps, chemical centrifugal pumps have the following characteristics compared with other centrifugal pumps:

(1) can meet the needs of chemical process: in chemical consumption, pumps should not only guarantee liquid materials and provide the necessary pressure for process requirements, but also ensure the quantity of materials to be guaranteed. in certain chemical unit operation, the flow and head of the requested pumps should be stable, and the high efficiency and reliable operation of pumps should be adhered to.

(2) corrosion resistance: the medium of chemical pump, including raw materials, reaction intermediates, etc. are often corrosive medium. this requires that the data of the pump be properly and reasonably selected to ensure the safety, stability and short-life fate of the pump.

(3) high temperature and low temperature resistance: high temperature medium guaranteed by chemical pumps, including process liquid materials, as well as heat carrying liquid required and produced in response process. for example: condensate pump, boiler feed pump, heat transfer oil pump. there are also many kinds of low-temperature media that chemical pumps provide,

(4) wear resistance and scour resistance: because the logistics of chemical pump includes suspended solid particles, and the impeller and cavity of pump also work under high pressure and high flow rate, the surface maintenance layer of pump parts is damaged, and its service life is short, so it is necessary to improve the wear resistance and scour resistance of chemical pump, which requires the pump data to select wear-resistant manganese steel, ceramics, cast iron, etc., and select wear-resistant manganese steel, ceramics, cast iron, etc scoured titanium, manganese steel, etc.

(5) reliable operation: reliable operation of chemical pumps includes two meanings: first, long-term operation without fault; second, stable operation of various parameters. the reliability of operation is very important for chemical consumption. if the pump often breaks down, it will not only cause frequent shutdown, which will affect the output and economic benefits, but also cause accidents of chemical system sometimes. the fluctuation of the rotation speed of the chemical pump will cause the fluctuation of the flow and the pressure at the pump outlet, make the chemical consumption unable to stop normally or the response in the system affected, and the material can not be balanced, which not only leads to waste, but also leads to the decline of the production quality or the scrapping of the product.

(6) no leakage or little leakage: most of the media guaranteed by chemical pumps are flammable, explosive, toxic and harmful liquids. once leakage occurs, the environment will be seriously polluted, personal safety and physical and mental health of employees will be endangered, and it is not in line with the requirements of no leakage factories and clean culture factories. therefore, it is necessary to ensure that chemical pumps do not leak during operation. new technologies and new materials shall be used for pump sealing according to regulations process operation, high quality maintenance.

(7) critical liquid: a critical liquid that often vaporizes when temperature increases or pressure decreases. chemical pumps sometimes guarantee the critical state of liquid, once the liquid vaporizes in the pump, it is easy to produce cavitation damage, which requires the pump to have high cavitation resistance. at the same time, the vaporization of the liquid may cause friction and scuffing in the dynamic and static parts of the pump, which requires a larger clearance. in order to prevent the mechanical seal, packing seal and labyrinth seal from being destroyed by dry friction due to the vaporization of liquid, this kind of chemical pump must have the structure of fully cleaning the gas in the pump.