原文：
1、前言 我车间脱碳系统采用热钾碱法脱除低变气中的CO2为合成氨提供合格的氢氮混合气，同时为尿素生产提供纯度大于98%的CO2气。其溶液循环主要靠溶液泵(脱碳大泵)提供。该泵系七十年代从日本引进。 该泵性能良好，操作简单，运行平稳。特别是MVB2830B型配套电机，操作稳定，使用二十多年从来未进行过大修。 多年来，由于系统负荷低，正常生产所需工艺流量小于200m3/h，远远小于泵的设计能力480m3/h。为了降低电耗，于92年对其叶轮进行了外圆切割，达到使用效果。但自99年化肥“8.13”一期工程投产后，所需工艺流量增加到240m3/h。根据改造组核算，并将叶轮恢复为原先的大叶轮，基本满足了当时的生产要求。2001年，化肥“8.13”二期工程投产，所需工艺流量增加至280m3/h，此时问题突出地暴露出来，大泵流量已无法再增加，常压塔出现挡液现象，操作失去弹性，负荷难以增加，生产很不稳定。为了解决这一制约生产的瓶颈问题，车间与机动处组成了专门人员进行攻关。 2、问题查找 根据原始资料，泵设计流量为480m3/h，远远高于化肥“8.13”所需的280m3/h，可实际运行中为何只能达到240m3/h，分析认为有以下原因： (1)经多年使用，泵蜗壳内壁冲刷腐蚀磨损，使其弧线偏离原设计值，间隙增加，回流器内的液体通过叶轮与泵壳间隙回流至叶轮入口，降低了出口流量，泵做了部分无用功。 (2)因多年来生产所需流量低，维修人员在检修时，有意加大了叶轮耐磨环与泵壳耐磨环处间隙。这一方面即可满足生产要求，又放宽了轴的直线度要求，放宽了泵轴与电机轴找正时的同轴度要求，方便了检修，还可延长耐磨环使用寿命。但却因此加大了回流量，所需流量增加时便不能满足要求。 (3)生产中泵入口温度偏高、压力偏低，也是造成流量低的一个原因。根据实践经验，入口温度每降低1e或入口压力每升高0.01MPa，流量可增加5~10m3/h。 (4)对于该泵流量偏低，我们认为一大原因是:该设备引进时无叶轮、轴等零部件图纸。早先的日本生产厂家已经停产。后来使用的叶轮是检修单位参照原有叶轮测绘配制的。叶片型线与原设计有误差，叶道截面比原先小，加上铸造叶轮内壁特别粗糙，这些都降低了泵的输送能力。 3、改进措施 (1)为了减少回流量，严格控制叶轮耐磨环与泵耐磨环之间隙在0.50~0.68mm，但同时要保证泵轴的刚度、直线度。经与加工厂进行了协商，要求严格按技术条件进行。如调质处理要到正规厂家做，并有书面报告。每次检修后，都要用百分表进行联轴器找正，控制公差小于0.05mm，确保泵轴与电机轴同心。 (2)生产中合理调配系统热量平衡，尽量降低入口碱液温度，{zg}不得超过108e。 (3)针对叶轮结构问题，通过机动处委托扬州联兴泵业有限公司专业人员重新核算设计，在不改变装配尺寸的前提下，分两步进行，{dy}步先改进了叶片渐开线，改整体浇注式为焊接式，xx了铸造后内表面凹凸不平的缺陷。第二步在强度核算允许范围内，适当减薄了叶片及前后盖板厚度，增大了入口处尺寸。 4、改造效果 新叶轮投用后，运行平稳，流量明显增加。在对叶轮结构的{dy}次改进后，流量由240m3/h增加为270m3/h，基本满足了生产要求。进行了第二次改进后，流量提高至310m3/h，高于目前维持高负荷生产所需的280m3/h。在生产不稳定的情况下，便于工艺调节，增大了操作弹性。在生产上增大了吸收CO2能力，xx了两塔拦液现象，xx了车间制约负荷提高的一大瓶颈，为化肥日产超400吨奠定了基础。

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译文：
1 Introduction I shop heat removal system using alkaline potassium removal of CO2 in the low transformation to provide qualified for the ammonia nitrogen and hydrogen mixed gas, while urea production provides more than 98% purity CO2 gas. The solution depends mainly on the solution circulating pump (decarbonization large pump) provided. Seventies of the pump system was introduced from Japan. The pump is in good, simple, smooth operation. Particularly MVB2830B type matching motor, stable operation, use 20 years had never been overhauled. Over the years, due to system load is low, the normal production process flow is less than the required 200m3 / h, much smaller than the designed capacity of the pump 480m3 / h. In order to reduce power consumption, in 92 years, a cylindrical cutting its impeller to achieve the results. However, since 99 years of chemical fertilizers, "8.13" a project put into operation, process flow required to 240m3 / h. According to accounting reform group, and restore the original large impeller impeller, basically meet the production requirements at that time. In 2001, chemical fertilizer, "8.13" Phase II production, the required process flow rate increased to 280m3 / h, then exposed prominently the large pump flow rate can no longer increase atmospheric tower block fluid phenomena appear, operating loss of elasticity, load is difficult to increase production is very unstable. In order to solve the bottleneck restricting the production, workshop and mobile of the Office of specialized personnel to tackle the problems. 2, issue search According to the original data, the pump design flow rate of 480m3 / h, much higher than chemical fertilizer, "8.13" necessary 280m3 / h, why can only be achieved in actual operation 240m3 / h, analysis for the following reasons: (1) After years of use, erosion-corrosion wear of the pump volute wall to make it curve deviated from the original design value, clearance increased, returning the liquid inside the pump through the impeller and the impeller shell gap back to the entrance, reducing the export flow, pumps do some useful work. (2) due to years of low flow for production, maintenance personnel in maintenance, the potential increase of the impeller wear ring and pump casing wear ring office space. Can meet the production requirements in this regard, but also to relax the requirement of axial straightness, relaxation of the pump shaft and motor shaft alignment concentricity when required, to facilitate the maintenance, but also to extend the service life of wear rings. But increased back flow, therefore, the required flow rate increases can not meet the requirements. (3) the production of high pump inlet temperature and pressure is low, is also one of the reasons causing the low flow rate. According to practical experience, the inlet temperature or inlet pressure per each lower 1e increased 0.01MPa, traffic increased 5 ~ 10m3 / h. (4) for the pump flow is low, we believe that a major reason: the introduction of the device when no impeller, shaft and other parts drawings. Japanese manufacturers have been previously discontinued. Later, a maintenance unit of the impeller used in reference to the original impeller mapping prepared. Blade profile and the original design error, leaves smaller than the original cross section, together with the impeller casting special rough wall, which are reducing the transmission capacity of the pump. 3, improvements (1) In order to reduce the back flow, strict control of the pump impeller wear rings and wear rings of the gap in the 0.50 ~ 0.68mm, but to ensure shaft stiffness, straightness. Held consultations with the processing plants require strict accordance with technical requirements. Such as hardening and do go to regular factory, and a written report. After each inspection, to be carried out with a dial indicator to find the coupling is, the control tolerances less than 0.05mm, ensure that the shaft concentric with the motor shaft. (2) a reasonable allocation of the production system, heat balance, to minimize the entrance of lye temperature, a maximum 108e. (3) for the impeller structure, commissioned by mobile office professionals Yangzhou Allied Pump Co., Ltd. recalculated the design, assembly size without changing the subject, in two steps, first step to improve the involute leaves, change overall mastic as welded to eliminate the uneven inner surface after casting defects. The second step in the intensity range of accounting permitted, appropriate thinning the thickness of the blade and the front cover, increasing the size of the entrance. 4, transforming effect The new impeller is put into use, stable, significant increase in traffic. Structure of the impeller in the first improvements, traffic from the 240m3 / h increased to 270m3 / h, basically meet the production requirements. A second improved, traffic increased to 310m3 / h, higher than the current required to maintain high load 280m3 / h. Instability in production, easy to process adjustment, increased operational flexibility. Increases in production capacity to absorb CO2, eliminating the liquid blocking phenomenon of the two towers, eliminating the constraints workshop to improve a major bottleneck load for the Nissan over 400 tons of chemical fertilizers basis.