CN101822910A - Method for reclaiming water from dry flue gas of high dew point lignite - Google Patents
Method for reclaiming water from dry flue gas of high dew point lignite Download PDFInfo
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- CN101822910A CN101822910A CN 201010151927 CN201010151927A CN101822910A CN 101822910 A CN101822910 A CN 101822910A CN 201010151927 CN201010151927 CN 201010151927 CN 201010151927 A CN201010151927 A CN 201010151927A CN 101822910 A CN101822910 A CN 101822910A
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Abstract
The invention relates to a method for reclaiming water from flue gas exhausted from a drying section of a lignite upgrading furnace. Because of high humidity and high dust content in the flue gas, indirect cooling is adopted, and coal sludge generated on a heat exchange surface deteriorates heat exchange, causes huge cooling surface of a cooler, and increases investment in fixed assets; and because the sludge need cleaning, the operation rate is also reduced. The method is characterized in that high-humidity and dust-containing flue gas is condensed and cooled in a direct spraying type cooling tower, moisture and coal dust in the flue gas are washed and carried away by circulating cooling water; and after the circulating cooling water removes the coal dust, the circulating cooling water is sent to an indirect air cooling tower for cooling, and is sent to the direct spraying type cooling tower, and the remaining water is pumped from a system and is drained outside. Besides the advantages of less investment in the fixed assets, small occupied area, compact equipment, high running operation rate, low operation cost, small labor force, direct contact between high-dust-content high-dew-point dry flue gas and the circulating cooling water, large heat transfer coefficient and small end temperature difference, the method has the advantages that the water reclaimed amount is expected to be increased, the coal dust is carried away by the circulating cooling water without indirect transfer surface or scaling, and the circulating cooling water is cooled by adopting the indirect air cooling tower so as to effectively reclaim the moisture in the lignite.
Description
Affiliated technical field
The present invention relates to the circulation and the comprehensive utilization of water resource
Background technology
China Inner Mongolia Autonomous Region is domestic, and brown coal are contained extremely abundant, just owing to water content height (reaching 42%), and calorific value low (about 3000kcal/kg); And have shortcomings such as easy oxidation, easily moisture absorption, easy efflorescence.Make resources advantage can not change economic advantages into.Datang state can the dry Co., Ltd of coal research and develop the upgrading stove that becomes to have independent intellectual property right, and successful is the high-quality thermal coal with the production of low-quality brown coal, coalite tar, low temperature coal gas etc. in reclaiming simultaneously.At the reality of local serious water shortage, they manage to recycle with containing in the raw material near the moisture content of half in system's design, and this is a kind of correct technology decision-making.
The upgrading stove is by dryer section, three sections compositions of retort section and cooling section, the present invention only relate to a kind of from the flue gas that dryer section is discharged the method for recycle-water.
The cooling process that former plan adopts is: flue gas (the about 120-130 of temperature ℃)-foam dedusting (about 80 ℃ of the temperature)-air cooler of dryer section outlet is cooled to 60 ℃.
Once advised air cooler has two kinds of structural shapes, i.e. fin tube type air cooler and heat pipe-type air cooler.Because high humidity, dustiness height in the flue gas are difficult to after the flue gas fouling in the pipe remove, the fin tube type air cooler is not selected.What select for use at present is the heat pipe-type air cooler.Its shortcoming is that investment is big; In summer high-temperature season, flue gas is cooled to 60 ℃ has any problem, in addition, and because dry flue gas high humidity, characteristic that dustiness is high do not change, still can fouling at the outer surface of heat pipe, snaking easier in the pipe just.
Because high humidity, dustiness height in the flue gas adopt the indirect type cooling, will generate the coal slime dirt certainly at heat exchange surface, have worsened heat transfer, make the cooler film-cooled heat huge, increase investment in fixed assets, owing to need snaking, have reduced operating rate again.
Summary of the invention
The invention is characterized in high humidity, ash-laden gas are carried out the condensation cooling at direct fountain cooling tower, steam in the flue gas and the coal dust circulating water flushing that is cooled is taken away, cooling circulating water is after removing coal dust, after being sent to the cooling of indirect type air cooling tower, be sent to direct fountain cooling tower again, rich water is extracted out from system and is effluxed.Below in conjunction with accompanying drawing, the invention will be further described.
Description of drawings
Fig. 1 is a flow chart of the present invention, among the figure: 1. direct fountain cooling tower, 2. circulating water pool, 3. decanter type separator, 4. filter, 5.1# water circulating pump, 6. air cooling tower, 7.2# water circulating pump.Deliver to the bottom of direct fountain cooling tower 1 by the next hot flue gas of upgrading stove dryer section, flow from bottom to top, with direct fountain cooling tower top spray, the cooling circulating water of sending here by the 2# water circulating pump, adverse current, direct heat transfer, water vapour in the flue gas is condensed into water and coal dust and together is recycled the water flushed zone and goes to circulating water pool 2, dust-laden recirculated water is isolated the dense mud of dust-laden through decanter type separator 3, leaching filter mud through filter 4 effluxes, the clear water retrieval system is sent in the air cooling tower 6 by 1# water circulating pump 5 in the lump together with the clear water of decanter type separator 3, after cooling circulating water is cooled therein, be sent to the top of direct fountain cooling tower 1 with 2# water circulating pump 7, condensed water more than needed is sent to the user outward.
The structural shape of direct fountain cooling tower has multiple, as battle array umbrella tower, porous sieve plate tower, spray tower, should select for use with suiting measures to local conditions.The air cooling element first-selection of air cooling tower is by the open day 2009.02.18 of " a kind of spiral lamina fin type air cooler " application number (CN2009100264117) publication number (CN101368776A) of applicant's invention.Because it has desirable cost performance.The heat exchange element of air cooling tower also can be selected finned tube for use, and cooling circulating water is walked in the cooling of pipe external application air in the pipe.Because cooling circulating water is the clear water that filters coal dust, non-scaling, big hot coefficient is big.
The invention has the beneficial effects as follows: investment in fixed assets is few, and floor space is little, facility compact, the operating rate height of operation, operating cost is low, and recruitment is few, the high dew point that dustiness is big directly contacts with cooling circulating water in dry flue gas, and heat transfer coefficient is big, and the end has a narrow range of temperature, be expected to increase the yield of water, the coal dust recirculated water that is cooled is taken away, and does not have the face, the anxiety of no fouling of indirectly changing, cooling circulating water adopts the cooling of indirect type air cooling tower, can effectively reclaim the moisture content in the brown coal.
Claims (3)
1. method from the high dew point dry flue gas of brown coal recycle-water, it is characterized in that high humidity, ash-laden gas are carried out the condensation cooling at direct fountain cooling tower, steam in the flue gas and the coal dust circulating water flushing that is cooled is taken away, cooling circulating water is after removing coal dust, after being sent to the cooling of indirect type air cooling tower, be sent to direct fountain cooling tower again, rich water is extracted out from system and is effluxed.
2. the method from the high dew point dry flue gas of brown coal recycle-water as claimed in claim 1 is characterized in that adopting the direct fountain cooling tower of a kind of conduct in a gust umbrella tower, porous sieve plate tower, the spray tower.
3. method from the high dew point dry flue gas of brown coal recycle-water as claimed in claim 1 is characterized in that the first-selected spiral lamina fin type air cooler of heat exchange element of air cooling tower, also can select finned tube for use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101519277A CN101822910B (en) | 2010-04-21 | 2010-04-21 | Method for reclaiming water from dry flue gas of high dew point lignite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101519277A CN101822910B (en) | 2010-04-21 | 2010-04-21 | Method for reclaiming water from dry flue gas of high dew point lignite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101822910A true CN101822910A (en) | 2010-09-08 |
| CN101822910B CN101822910B (en) | 2012-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010101519277A Expired - Fee Related CN101822910B (en) | 2010-04-21 | 2010-04-21 | Method for reclaiming water from dry flue gas of high dew point lignite |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102776033A (en) * | 2012-08-07 | 2012-11-14 | 中冶焦耐工程技术有限公司 | Coke oven gas purifying process adopting closed-loop air cooled circulating water to cool high-temperature media |
| CN102936063A (en) * | 2012-10-25 | 2013-02-20 | 中国五环工程有限公司 | Process method and system for recovering water from lignite drying flue gas |
| CN103499196A (en) * | 2013-09-16 | 2014-01-08 | 华北电力大学（保定） | Heat exchanger recycling exhaust-gas moisture after lignite is dried |
| CN103537112A (en) * | 2013-09-30 | 2014-01-29 | 东华工程科技股份有限公司 | Method for recovering water from hot carrier gas for lignite drying |
| CN113418356A (en) * | 2021-07-02 | 2021-09-21 | 重庆朗福环保科技有限公司 | Energy-saving and carbon-reducing technology and device for building material enterprises |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1435271A (en) * | 2003-02-27 | 2003-08-13 | 佛山市环境保护研究所 | Flue gas treating method |
| CN101539375A (en) * | 2009-04-23 | 2009-09-23 | 吴植仁 | Spiral lamina fin type air cooler |
| CN101642667A (en) * | 2009-09-03 | 2010-02-10 | 浙江天蓝环保技术有限公司 | Method for using cooling-tower circulating water as water used by flue gas desulfurization system |
-
2010
- 2010-04-21 CN CN2010101519277A patent/CN101822910B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1435271A (en) * | 2003-02-27 | 2003-08-13 | 佛山市环境保护研究所 | Flue gas treating method |
| CN101539375A (en) * | 2009-04-23 | 2009-09-23 | 吴植仁 | Spiral lamina fin type air cooler |
| CN101642667A (en) * | 2009-09-03 | 2010-02-10 | 浙江天蓝环保技术有限公司 | Method for using cooling-tower circulating water as water used by flue gas desulfurization system |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102776033A (en) * | 2012-08-07 | 2012-11-14 | 中冶焦耐工程技术有限公司 | Coke oven gas purifying process adopting closed-loop air cooled circulating water to cool high-temperature media |
| CN102936063A (en) * | 2012-10-25 | 2013-02-20 | 中国五环工程有限公司 | Process method and system for recovering water from lignite drying flue gas |
| CN102936063B (en) * | 2012-10-25 | 2014-10-29 | 中国五环工程有限公司 | Process method and system for recovering water from lignite drying flue gas |
| CN103499196A (en) * | 2013-09-16 | 2014-01-08 | 华北电力大学（保定） | Heat exchanger recycling exhaust-gas moisture after lignite is dried |
| CN103499196B (en) * | 2013-09-16 | 2015-06-03 | 华北电力大学（保定） | Heat exchanger recycling exhaust-gas moisture after lignite is dried |
| CN103537112A (en) * | 2013-09-30 | 2014-01-29 | 东华工程科技股份有限公司 | Method for recovering water from hot carrier gas for lignite drying |
| CN103537112B (en) * | 2013-09-30 | 2016-05-25 | 东华工程科技股份有限公司 | A kind of method from the hot carrier gas recycle-water of brown coal drying |
| CN113418356A (en) * | 2021-07-02 | 2021-09-21 | 重庆朗福环保科技有限公司 | Energy-saving and carbon-reducing technology and device for building material enterprises |
| CN113418356B (en) * | 2021-07-02 | 2023-02-03 | 重庆朗福环保科技有限公司 | Energy-saving and carbon-reducing technology and device for building material enterprise |
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| Publication number | Publication date |
|---|---|
| CN101822910B (en) | 2012-06-06 |
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