国家对冷库涉氨企业要求严格,这其实是对氨用冷库的使用操作的一个严格规范,但有些企业为了避免麻烦而选择冷库改造氨改氟,根据制冷专家认为,氟制冷是较适合于小型冷库,大中型冷库使用氨制冷较长远。小型冷库氨改(gai)氟也(ye)是可行的,下面专(zhuan)家(jia)针对不同原氨制冷系统特(te)点、建筑(zhu)结构、保(bao)温(wen)特(te)点、使用要求等提(ti)供四种改(gai)造方案供参考:
第一种(zhong):原氨(an)制冷(leng)(leng)(leng)系(xi)(xi)(xi)(xi)统(tong)改成氟用(yong)(yong)(yong)桶泵供液制冷(leng)(leng)(leng)系(xi)(xi)(xi)(xi)统(tong),采用(yong)(yong)(yong)专用(yong)(yong)(yong)冷(leng)(leng)(leng)库(ku)载冷(leng)(leng)(leng)剂, 适用(yong)(yong)(yong)于各(ge)类(lei)螺旋速冻机(ji)、隧道式单(dan)冻机(ji)、风冷(leng)(leng)(leng)型速冻库(ku)等(deng)制冷(leng)(leng)(leng)系(xi)(xi)(xi)(xi)统(tong),或将原氨(an)冷(leng)(leng)(leng)库(ku)排管(guan)更换成氟用(yong)(yong)(yong)排管(guan)系(xi)(xi)(xi)(xi)统(tong),冷(leng)(leng)(leng)库(ku)改造(zao)后的制冷(leng)(leng)(leng)系(xi)(xi)(xi)(xi)统(tong)具有能效(xiao)比高、系(xi)(xi)(xi)(xi)统(tong)稳定(ding)、管(guan)理方便等(deng)特(te)点。
第二(er)种(zhong):原(yuan)氨制冷系统改(gai)造成氟(fu)制冷满(man)液式供(gong)液乙二(er)醇系统 保(bao)留(liu)原(yuan)室内(nei)换(huan)(huan)热(re)器,如库内(nei)吊顶排管、速冻(dong)(dong)搁架、冷风机(ji)(ji)、制冰系统中的螺旋蒸发管等(deng)(deng)换(huan)(huan)热(re)蒸发器设备(bei),只(zhi)(zhi)是将冷冻(dong)(dong)机(ji)(ji)组(zu)主(zhu)机(ji)(ji)更换(huan)(huan)成我(wo)公司的专用(yong)制冷机(ji)(ji)组(zu);制取低温载(zai)冷剂输送(song)至室内(nei)换(huan)(huan)热(re)器进(jin)行(xing)换(huan)(huan)热(re),从而达到设定(ding)温度。具有(you)施工简单、改(gai)成周期(qi)短、管路方便、成本低等(deng)(deng)特点。温度范(fan)围可(ke)(ke)在+15℃至-150℃进(jin)行(xing)。采用(yong)载(zai)冷剂间接制冷,不(bu)存在直接蒸发系统中回油难、制冷剂容(rong)易泄漏(lou)、漏(lou)点难检测、分液不(bu)均匀等(deng)(deng)难题;只(zhi)(zhi)需对制冷主(zhu)机(ji)(ji)做定(ding)期(qi)保(bao)养即可(ke)(ke),故(gu)障率低、维修费用(yong)省。 设备(bei)可(ke)(ke)根据冷库实际负荷实现(xian)25%~100%进(jin)行(xing)能量调节或高效变频(pin)节能条件,同时(shi)通过冷冻(dong)(dong)泵(beng)供(gong)液,不(bu)存在压(ya)力(li)损(sun)失、冷量损(sun)失、参数难于(yu)控(kong)制等(deng)(deng)问题;其可(ke)(ke)控(kong)性强(qiang);故(gu)综合(he)能效比高。
第三(san)种(zhong):原氨(an)制(zhi)冷(leng)(leng)系统改成以氨(an)系统为冷(leng)(leng)源(yuan)(yuan)专(zhuan)用冷(leng)(leng)冻液进末(mo)端系统 保持原先的(de)冷(leng)(leng)源(yuan)(yuan)不变,通(tong)过增加(jia)卧式蒸发器加(jia)乙二醇水泵供到(dao)末(mo)端冷(leng)(leng)风机。这种(zhong)也是目前最实惠一种(zhong)改造方案。
第四种(zhong):原氨(an)制(zhi)(zhi)冷(leng)系(xi)统(tong)改(gai)成小(xiao)型风(feng)(feng)冷(leng)氟利(li)(li)昂制(zhi)(zhi)冷(leng)系(xi)统(tong),有些氨(an)系(xi)统(tong)用的车间空调(diao)和小(xiao)型冷(leng)库,冷(leng)库改(gai)造(zao)的风(feng)(feng)冷(leng)氟利(li)(li)昂制(zhi)(zhi)冷(leng)系(xi)统(tong),制(zhi)(zhi)冷(leng)系(xi)统(tong)简单,故障(zhang)率(lv)低,各个系(xi)统(tong)相互对立,节能效果明显。 |