SELECT pctemplate,waptemplate,pchtmlpath,waphtmlpath,sitekeys,sitedesc,siteurl,sitewapurl FROM zzz_language WHERE l_alias='ch' LIMIT 1,步时:32.64毫秒
select * from zzz_sort where sid=(select c_sid from zzz_content where cid=76),步时:9.40毫秒
SELECT sid,s_name,s_pic,s_type,s_enname,s_url,s_filename FROM zzz_sort WHERE (`sid`=4 OR `sid`=10) LIMIT 0,10,步时:0.34毫秒
SELECT * FROM zzz_language WHERE l_onoff=1 LIMIT 1,步时:78.66毫秒
SELECT * FROM zzz_content c,zzz_sort s WHERE `cid`=76 AND `sid`= c_sid LIMIT 1,步时:2.21毫秒
UPDATE zzz_content SET `c_visits`=c_visits+1 WHERE cid=76,步时:15.96毫秒
SELECT cid,c_title,c_type,c_pic,c_pagename,c_link FROM zzz_content WHERE c_onoff=1 and CID<76 and C_sid=10 ORDER BY cid desc LIMIT 1,步时:10.76毫秒
SELECT cid,c_title,c_type,c_pic,c_pagename,c_link FROM zzz_content WHERE c_onoff=1 and CID>76 and C_sid=10 ORDER BY cid asc LIMIT 1,步时:0.42毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=1) LIMIT 0,1000,步时:5.53毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=17) LIMIT 0,1000,步时:2.54毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=18) LIMIT 0,1000,步时:2.01毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=2) LIMIT 0,1000,步时:1.79毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=40) LIMIT 0,1000,步时:1.87毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=41) LIMIT 0,1000,步时:2.04毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=43) LIMIT 0,1000,步时:2.01毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=44) LIMIT 0,1000,步时:1.84毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=47) LIMIT 0,1000,步时:1.76毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=48) LIMIT 0,1000,步时:0.26毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=3) LIMIT 0,1000,步时:5.99毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=19) LIMIT 0,1000,步时:2.61毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=42) LIMIT 0,1000,步时:2.43毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=45) LIMIT 0,1000,步时:2.61毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=46) LIMIT 0,1000,步时:2.69毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=49) LIMIT 0,1000,步时:2.59毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=4) LIMIT 0,1000,步时:2.71毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=10) LIMIT 0,1000,步时:5.59毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=11) LIMIT 0,1000,步时:3.95毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=76) LIMIT 0,1000,步时:3.95毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=12) LIMIT 0,1000,步时:4.51毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=13) LIMIT 0,1000,步时:4.52毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=5) LIMIT 0,1000,步时:4.01毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=14) LIMIT 0,1000,步时:2.15毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=15) LIMIT 0,1000,步时:1.69毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=16) LIMIT 0,1000,步时:1.70毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=6) LIMIT 0,1000,步时:0.25毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=7) LIMIT 0,1000,步时:1.98毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=8) LIMIT 0,1000,步时:1.98毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=9) LIMIT 0,1000,步时:0.25毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=2) LIMIT 0,1000,步时:0.24毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=5) LIMIT 0,1000,步时:1.72毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=4) LIMIT 0,1000,步时:1.87毫秒
select sid from zzz_sort where s_onoff=1 and (s_path like '%,3,%' or s_path like '3,%' or s_path like '%,3' ),步时:3.58毫秒
SELECT c.*,s.s_filename,s.s_url,s.s_name,s.s_enname FROM zzz_content c,zzz_sort s WHERE `c_onoff`=1 AND `sid`= c_sid AND (`c_sid`=3 OR `c_sid`=19 OR `c_sid`=42 OR `c_sid`=45 OR `c_sid`=46 OR `c_sid`=48 OR `c_sid`=49) ORDER BY `istop` DESC ,`isgood` DESC ,`c_order` ASC ,`c_addtime` DESC ,`cid` DESC LIMIT 0,15,步时:3.82毫秒
select sid from zzz_sort where s_onoff=1 and (s_path like '%,10,%' or s_path like '10,%' or s_path like '%,10' ),步时:24.12毫秒
SELECT c.*,s.s_filename,s.s_url,s.s_name,s.s_enname FROM zzz_content c,zzz_sort s WHERE `c_onoff`=1 AND `sid`= c_sid AND (`c_sid`=10) ORDER BY `istop` DESC ,`isgood` DESC ,`c_order` ASC ,`c_addtime` DESC ,`cid` DESC LIMIT 0,4,步时:0.95毫秒
select sid from zzz_sort where s_onoff=1 and (s_path like '%,11,%' or s_path like '11,%' or s_path like '%,11' ),步时:1.03毫秒
SELECT c.*,s.s_filename,s.s_url,s.s_name,s.s_enname FROM zzz_content c,zzz_sort s WHERE `c_onoff`=1 AND `sid`= c_sid AND (`c_sid`=11) ORDER BY RANDOM() LIMIT 0,5,步时:1.02毫秒
真空锅炉工作原理和如下:
一、真空锅炉工作原理
水在一个大气压下的沸点为100℃,当压力小于1 bar时,水的沸点小于100℃,压力为-0.7 bar,沸点为90℃,压力为-0.3 bar,沸点为70℃,压力为-0.1 bar,沸点为40℃。
真空热水机组内的密闭腔在真空抽吸后形成真空腔。燃烧使加热的介质水在真空腔内沸腾和蒸发,产生负压水蒸气。蒸汽在换热器管外凝结,加热和加热管道中的冷水,并将其引入用户。水蒸气冷凝后形成的水滴回流到加热介质水中,再加热蒸发完成整个循环。机组的正常工作压力小于-0.7 bar。
热介质水是一种经过除垢、脱氧处理的高纯水,在出厂前一次性注入,使用时在装置内循环(蒸发-冷凝-蒸发),不增减,在设备使用寿命内不需要补充或更换。
二、真空锅炉的主要特性
(1)在无爆炸的真空负压下操作的锅炉极为安全。
(2)成功地分离了锅炉应力钢板的高温区和高压区,使锅炉的使用寿命分别延长了2倍和3倍,设计使用寿命可达30年。
(3)总体设计科学、合理、紧凑,节约面积50°70°。
(4)锅炉进行换热时,整机效率高达91°,启动后2 min内可提供70°80℃热水,可大大缩短预热周期。
(5)自动控制,可实现智能、无人或远程网络控制。
(6)内置不锈钢换热器对水质无污染。
(7)与间接型(锅炉外热交换器循环水泵材料安装成本)相比,安装成本可节省30≤40×8,具有效率高、加热快、传热好、节省燃油20≤30等优点。