{"id":39,"date":"2018-11-27T07:45:52","date_gmt":"2018-11-27T07:45:52","guid":{"rendered":"http:\/\/www.plantg.co.jp\/?page_id=39"},"modified":"2024-02-23T03:27:01","modified_gmt":"2024-02-22T18:27:01","slug":"bottomash","status":"publish","type":"page","link":"http:\/\/plantg.co.jp\/en\/products\/bottomash\/","title":{"rendered":"BOTTOM ASH HANDLING SYSTEM"},"content":{"rendered":"
\nThe fly ash which is discharged from the bottom ash discharged from the bottom in a boiler furnace (clinker ash) is cooled, it’s picked out and the equipment from which this is conveyed to a storage place is called bottom ash handling system.\n<\/div>\n
\n

A submerged scraper conveyor system is used at Europe mainly.<\/p>\n

There are little make-up water amount and power consumption, and this system is low in cost and is an economical way.<\/p>\n

But there is a problem in the reliability and the maintenance because it’s mechanical.<\/p>\n

A system suitable to lower the cost.<\/p>\n

A Hydraulic Conveying System with a jet pump is popular by Japan and U.S..<\/p>\n

This is because practical use including maintenance is easy and highly reliable compared with the submerged scraper conveyor system.<\/p>\n

But, when using a jet pump, there is a lot of quantity of water and the power to use a high pressure water pump is big also a noise is about 110 dB of violence, so it isn’t desirable as the operational environment.<\/p>\n

So we paid attention to an ash pump system for the purpose of canceling the fault of both systems and utilizing the merit.<\/p>\n

And we advanced research and development and succeeded in commercializing.<\/p>\n

This system is working at a lot of power plants because the quantity of water and the power are little, and equipment is compact and practical use is convenient.<\/p>\n<\/div>\n\n\n\n\n\n\n
<\/th>\nsubmerged scraper conveyor system<\/th>\nHydraulic Conveying System<\/th>\nash pump system<\/th>\n<\/tr>\n
Diagram<\/td>\n\n\u3000\u3000\u3000\u3000\"submerged
\n\u3000\u3000<\/td>\n		\n\u3000\u3000\u3000\u3000\"Hydraulic
\n\u3000\u3000<\/td>\n		\n\u3000\u3000\u3000\u3000\"ash
\n\u3000\u3000<\/td>\n

\u3000<\/tr>\n

\u3000 <\/p>\n

Outline<\/td>\n\n
\nBottom ash falls in the installed submerged scraper conveyor under the boiler furnace, and mixes with water and is cooled.
\nAsh is separated from water at the inclination part of a conveyor.
\nThis is broken by a clinker crusher and it’s stored in an ash bunker using Chen conveyor or a belt conveyor.
\nThis ash is carried at a track.\n<\/div>\n<\/td>\n
\n
\nThe ash discharged under the clinker hopper is crushed by a clinker crusher.
\nThat’s conveyed to dehydration tack by the waterpower using a jet pump.
\nDehydrated ash is carried at a track.
\nAfter the ash handling water from dehydration tack made the SS density fall to less than 500 ppm by an ashy precipitator, it’s utilized in a cycle via a water tank.\n<\/div>\n<\/td>\n
\n
\nThe ash discharged under the clinker hopper is crushed by a clinker crusher.
\nThat’s conveyed to dehydration tack by the waterpower using a jet pump.
\nDehydrated ash is carried at a track.
\nAfter the ash handling water from dehydration tack made the SS density fall to less than 500 ppm by an ashy precipitator, it’s utilized in a cycle via a water tank.\n<\/div>\n<\/td>\n<\/tr>\n
Feature<\/td>\n\n
    \n
  • Operation — Continuous<\/li>\n
  • There is little utility amount of consumption.<\/li>\n
  • There are a lot of wear parts in equipment, and maintenance is complex.<\/li>\n
  • It’s running continuously, so it’s difficult to repair a running breakdown.<\/li>\n<\/ul>\n<\/td>\n
\n
    \n
  • Operation — Intermittent\n
  • The setting area under the furnace is small, but tanks and ponds is necessary.\n
  • Power costs necessary for ash transportation are high.\n
  • Because it is big, a noise level of the jet pump has a problem with work environment with 110db degree.\n
  • The maintenance is relatively easy.\n<\/ul>\n<\/td>\n
\n
    \n
  • Operation — Intermittent\n
  • The setting area under the furnace is largish.\n
  • A noise level of the Ashe pump is 85db degree, and the work environment is good.\n
  • Abrasion measures are necessary for the ash pump.\n<\/ul>\n<\/td>\n<\/tr>\n
use<\/td>\n\n
    \n
  • water — about 0.5t \/ ash 1t\n
  • electric power —– about 10kWH \/ ash 1t\n<\/ul>\n<\/td>\n
\n
    \n
  • water — about 1t \/ ash 1t\n
  • electric power —– about 24kWH \/ ash 1t\n<\/ul>\n<\/td>\n
\n
    \n
  • water — about 1t \/ ash 1t\n
  • electric power —– about 18kWH \/ ash 1t\n<\/ul>\n<\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

    The fly ash which is discharged from the bottom ash discharged from the bottom in a boiler furnace (clinker as…<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":34,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"tags":[],"_links":{"self":[{"href":"http:\/\/plantg.co.jp\/en\/wp-json\/wp\/v2\/pages\/39"}],"collection":[{"href":"http:\/\/plantg.co.jp\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"http:\/\/plantg.co.jp\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"http:\/\/plantg.co.jp\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/plantg.co.jp\/en\/wp-json\/wp\/v2\/comments?post=39"}],"version-history":[{"count":16,"href":"http:\/\/plantg.co.jp\/en\/wp-json\/wp\/v2\/pages\/39\/revisions"}],"predecessor-version":[{"id":928,"href":"http:\/\/plantg.co.jp\/en\/wp-json\/wp\/v2\/pages\/39\/revisions\/928"}],"up":[{"embeddable":true,"href":"http:\/\/plantg.co.jp\/en\/wp-json\/wp\/v2\/pages\/34"}],"wp:attachment":[{"href":"http:\/\/plantg.co.jp\/en\/wp-json\/wp\/v2\/media?parent=39"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/plantg.co.jp\/en\/wp-json\/wp\/v2\/tags?post=39"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}