SELECT pctemplate,waptemplate,pchtmlpath,waphtmlpath,sitekeys,sitedesc,siteurl,sitewapurl FROM zzz_language WHERE l_alias='ch' LIMIT 1,步时:25.99毫秒
select * from zzz_sort where sid=(select c_sid from zzz_content where cid=87),步时:9.82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:0.29毫秒
SELECT * FROM zzz_language WHERE l_onoff=1 LIMIT 1,步时:31.88毫秒
SELECT * FROM zzz_content c,zzz_sort s WHERE `cid`=87 AND `sid`= c_sid LIMIT 1,步时:2.41毫秒
UPDATE zzz_content SET `c_visits`=c_visits+1 WHERE cid=87,步时:25.46毫秒
SELECT cid,c_title,c_type,c_pic,c_pagename,c_link FROM zzz_content WHERE c_onoff=1 and CID<87 and C_sid=10 ORDER BY cid desc LIMIT 1,步时:11.22毫秒
SELECT cid,c_title,c_type,c_pic,c_pagename,c_link FROM zzz_content WHERE c_onoff=1 and CID>87 and C_sid=10 ORDER BY cid asc LIMIT 1,步时:0.64毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=1) LIMIT 0,1000,步时:5.88毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=17) LIMIT 0,1000,步时:3.18毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=18) LIMIT 0,1000,步时:2.36毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=2) LIMIT 0,1000,步时:10.17毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=40) LIMIT 0,1000,步时:2.59毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=41) LIMIT 0,1000,步时:2.08毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=43) LIMIT 0,1000,步时:2.10毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=44) LIMIT 0,1000,步时:2.12毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=47) LIMIT 0,1000,步时:2.02毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=48) LIMIT 0,1000,步时:0.32毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=3) LIMIT 0,1000,步时:1.98毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=19) LIMIT 0,1000,步时:1.95毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=42) LIMIT 0,1000,步时:1.94毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=45) LIMIT 0,1000,步时:2.09毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=46) LIMIT 0,1000,步时:1.80毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=49) LIMIT 0,1000,步时:1.82毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=4) LIMIT 0,1000,步时:1.73毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=10) LIMIT 0,1000,步时:3.83毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=11) LIMIT 0,1000,步时:4.24毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=76) LIMIT 0,1000,步时:4.35毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=12) LIMIT 0,1000,步时:4.29毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=13) LIMIT 0,1000,步时:4.42毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=5) LIMIT 0,1000,步时:4.46毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=14) LIMIT 0,1000,步时:2.25毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=15) LIMIT 0,1000,步时:1.82毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=16) LIMIT 0,1000,步时:1.79毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=6) LIMIT 0,1000,步时:0.22毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=7) LIMIT 0,1000,步时:1.84毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=8) LIMIT 0,1000,步时:1.88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:0.23毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=5) LIMIT 0,1000,步时:1.71毫秒
SELECT * FROM zzz_sort WHERE `s_onoff`=1 AND (`sid`=4) LIMIT 0,1000,步时:1.84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:3.76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:3.52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:20.41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:0.83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:0.92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:0.59毫秒
天然气热水锅炉工作原理:
是通过燃烧头将混合气体注入锅炉的炉内,并通过燃烧头上的点火装置点燃填充在炉内的混合气体。达到加热锅炉炉衬和炉管的效果。如果锅炉性能良好,将设计一个多曲燃烧室,即增加炉体内燃烧气体的冲程。这样,提高燃气锅炉热效率的关键是将燃烧头、天然气或燃油与空气混合达到一定比例。只有这样,天然气或石油才能完全燃烧。
以下将对天燃气热水锅炉工作原理进行概述:
天然气热水锅炉工作原理图
在天然气锅炉的炉膛中,烟气将热量散发到水冷壁。在炉膛的烟气出口处,热量以半辐射和半卷积的形式传递到筛分过热器,在水平烟道和尾部烟道上,热量以对流的方式传递到过热器、再热器、空气省煤器和空气预热器,从而使锅炉给水通过省煤器、水冷壁和过热器变成过热蒸汽,工作完成后,从汽轮机高压缸中抽出的蒸汽变成再加热蒸汽。
与燃油锅炉和电锅炉相比,天然气锅炉是最简单、最经济的,因此人们选择天然气热水锅炉,它主要用作蒸汽、加热和洗澡锅炉设备。
通过以上对燃气锅炉工作原理的总结,有助于我们了解燃气锅炉使用时的工作原理,对今后的维护有一定的帮助。值得注意的是,燃气锅炉在水压不足的情况下,使用的气体量大,容易过热,不宜在风寒地区使用。