CN103537112B - A kind of method from the hot carrier gas recycle-water of brown coal drying - Google Patents
A kind of method from the hot carrier gas recycle-water of brown coal drying Download PDFInfo
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- CN103537112B CN103537112B CN201310461237.5A CN201310461237A CN103537112B CN 103537112 B CN103537112 B CN 103537112B CN 201310461237 A CN201310461237 A CN 201310461237A CN 103537112 B CN103537112 B CN 103537112B
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Abstract
The invention discloses a kind of method from the hot carrier gas recycle-water of brown coal drying, under the effect of blower fan, enter scrubbing tower from the dry heat carrier gas of drying unit and carry out the adiabatic washing of two-stage, tail gas after washing enters air cooler, indirectly cooling with surrounding air, after gas-liquid separation, liquid phase enters water recovery tank, after simple processing, reach the water standard of industrial circulating water, gas phase is returned drying unit through recycled offgas blower fan and is recycled. System of the present invention have operating cost low, reclaim good, the water rate of recovery high of water quality.
Description
Technical field
The present invention relates to dry heat carrier gas recycle-water technical field, be specially a kind of method from the hot carrier gas recycle-water of brown coal drying.
Background technology
Due to the feature of brown coal " three Senior Two are low " (high-moisture, high volatile, high ash content, low heat value, low ash smelting point), bring a series of problem to the operation of boiler using brown coal unit: high-moisture causes vapour content in flue gas to increase, and flue gas loss increases; High volatile, low ash smelting point is that brown coal have stronger Slagging Characteristics; Low heat value increases coal consumption amount, and the investments such as the adopting of fuel, transportation, storage, processing increase. After brown coal drying and upgrading, the caloric value of brown coal improves greatly, and the greenhouse gases of discharging after burning reduce.
The lignite resource of China is abundant, accounts for 13% of coal reserves, is mainly distributed in the ground such as northeast, northwest, North China, southwest. Especially for brown coal main producing regions such as the Inner Mongol, water resource famine, saving water resource reclaims moisture content and just seems particularly important from brown coal drying gas.
Chinese patent 201010151927.7 has proposed a kind of method from high dew point brown coal drying off-gas recovery water. According to the method, high humidity, ash-laden gas are carried out to condensing cooling at direct spray-type cooling tower, steam in flue gas and the coal dust circulating water flushing that is cooled is taken away, cooling circulating water is being removed after coal dust, be sent to indirect type air cooling tower cooling after, be sent to direct spray-type cooling tower, rich water is arranged outside extracting out from system again. Although the moisture content in this invention energy recovered flue gas, the rate of recovery is not high, and the water purity reclaiming is not high, needs follow-up water treatment, and in addition, flue gas directly discharges atmosphere, and contaminated environment is on the one hand also a kind of waste.
Summary of the invention
The object of this invention is to provide a kind of method from the hot carrier gas recycle-water of brown coal drying, the problem existing to solve prior art.
In order to achieve the above object, the technical solution adopted in the present invention is:
A kind of method from the hot carrier gas recycle-water of brown coal drying, it is characterized in that: entering before scrubbing tower overheated the dry heat carrier gas as tail gas, in scrubbing tower, carry out thermal insulation washing and remove dust, adopt the carrier gas of air cooler condensation heat, the object that reaches recycle-water, process is as follows:
Cross hot exhaust gas at 110 DEG C that come from brown coal drying unit, under the effect of blower fan, enter scrubbing tower; Washing process is completed by two-stage scrubbing tower, under micro-negative pressure, with the recirculated water washing of 80 ~ 90 DEG C, the dust granules in described tail gas is taken off; One-level scrubbing tower is void tower, and Ta Nei establishes multilayer atomizer, and the big dust particle in tail gas is washed down, and secondary scrubbing tower is equipped with filler, removes dust small in tail gas; Washing process is approximately an adiabatic washing process, but because dried tail gas has certain degree of superheat, constantly evaporation of moisture in one-level scrubbing tower, in tower, recirculated water impurity can be constantly concentrated, for preventing fouling in tower, at the bottom of tower, draw one water and go out, prepare water as coal slurry; The feedwater of one-level scrubbing tower is supplemented by secondary scrubbing tower recirculated water, and the feedwater of secondary scrubbing tower is supplemented by air cooler condensed water; Tail gas after washing enters air cooler, indirectly cooling with surrounding air, is cooled to 40 ~ 50 DEG C, and after gas-liquid separation, liquid phase enters water recovery tank, realizes the recovery of water in tail gas, and gas phase is returned drying unit through recycled offgas blower fan and recycled.
The hot carrier gas of brown coal drying is 110 DEG C of low-pressure nitrogens with saturated steam that produce in brown coal drying process, and the degree of superheat is 5 ~ 10 DEG C, suitable overheated be in order to prevent that tail gas is in transmitting procedure condensation.
Be equipped with two sections of scrubbing towers, under thermal insulation, washed, can thoroughly the dust washing in tail gas have been got off, ensured follow-up water quality; The pressure that tail gas enters a tower is 91kPa.A, and a column overhead temperature is controlled at 88 DEG C, pressure 90kPa.A, and two column overhead temperature are controlled at 87 DEG C, pressure 88kPa.A.
The feedwater of one-level scrubbing tower is supplemented by secondary scrubbing tower recirculated water, and the feedwater of secondary scrubbing tower is supplemented by air cooler condensed water.
Adopt indirect air cooling device to operate under micro-negative pressure, controlled pressure is at 78kPa.A, and it is 40 ~ 50 DEG C that tail gas goes out air cooler temperature.
Advantage of the present invention is:
The present invention have reclaim water quality good, operating cost is low, water rate of recovery high. Whole device operates under micro-negative pressure, and floor space is little, and plant investment is low.
The water rate of recovery is high, can reach more than 88%. Because brown coal drying technological temperature is lower, substantially there is no the volatilization of organic volatile part, after two-stage washing, condensed water quality is good, only contain a small amount of duff dust, with slight peculiar smell and colourity, after simple filtration, can ensure that the water quality after reclaiming reaches GB/T50050-2007 " Code for design of industrial recirculating cooling water treatment recycled water water quality index " requirement.
Dry heat carrier gas can recycle, although increased the power consumption of exhaust fan, compared with the dry heat carrier gas of saving, operating cost still reduces much.
Brief description of the drawings
Fig. 1 is process chart of the present invention.
Detailed description of the invention
As shown in Figure 1. In Fig. 1,1 is one-level scrubbing tower; 2 is secondary scrubbing tower; 3 is air cooler; 4 is separator; 5 is water recovery tank; 6 is exhaust fan; 7 is waste water excavationg pump; 8 is water circulating pump A; 9 is water circulating pump B; 10 is small pump; 11 is recycle-water excavationg pump.
A kind of method from the hot carrier gas recycle-water of brown coal drying of the present invention entering before scrubbing tower overheated the dry heat carrier gas as tail gas, is carried out thermal insulation washing and is removed dust in scrubbing tower, adopts the carrier gas of air cooler condensation heat, reaches the object of recycle-water, and process is as follows:
Cross hot exhaust gas at 110 DEG C that come from brown coal drying unit, under the effect of blower fan, enter scrubbing tower; Washing process is completed by two-stage scrubbing tower, under micro-negative pressure, with the recirculated water washing of 80 ~ 90 DEG C, the dust granules in tail gas is taken off; One-level scrubbing tower is void tower, and Ta Nei establishes multilayer atomizer, and the big dust particle in tail gas is washed down, and secondary scrubbing tower is equipped with filler, removes dust small in tail gas; Washing process is approximately an adiabatic washing process, but because dried tail gas has certain degree of superheat, constantly evaporation of moisture in one-level scrubbing tower, in tower, recirculated water impurity can be constantly concentrated, for preventing fouling in tower, at the bottom of tower, draw one water and go out, prepare water as coal slurry; The feedwater of one-level scrubbing tower is supplemented by secondary scrubbing tower recirculated water, and the feedwater of secondary scrubbing tower is supplemented by air cooler condensed water; Tail gas after washing enters air cooler, indirectly cooling with surrounding air, is cooled to 40 ~ 50 DEG C, and after gas-liquid separation, liquid phase enters water recovery tank, realizes the recovery of water in tail gas, and gas phase is returned drying unit through recycled offgas blower fan and recycled.
The hot carrier gas of brown coal drying is 110 DEG C of low-pressure nitrogens with saturated steam that produce in brown coal drying process, and the degree of superheat is 5 ~ 10 DEG C, suitable overheated be in order to prevent that tail gas is in transmitting procedure condensation.
Be equipped with two sections of scrubbing towers, under thermal insulation, washed, can thoroughly the dust washing in tail gas have been got off, ensured follow-up water quality; The pressure that tail gas enters a tower is 91kPa.A, and a column overhead temperature is controlled at 88 DEG C, pressure 90kPa.A, and two column overhead temperature are controlled at 87 DEG C, pressure 88kPa.A.
The feedwater of one-level scrubbing tower is supplemented by secondary scrubbing tower recirculated water, and the feedwater of secondary scrubbing tower is supplemented by air cooler condensed water.
Adopt indirect air cooling device to operate under micro-negative pressure, controlled pressure is at 78kPa.A, and it is 40 ~ 50 DEG C that tail gas goes out air cooler temperature.
Taking Inner Mongolia, 3,600,000 tons/year of brown coal upgrading projects are as example, and feed coal water content is 37.4%, and dry heat carrier gas enters the adiabatic washing of scrubbing tower, washing process is completed by two-stage scrubbing tower, one-level scrubbing tower, 88 DEG C of tower top temperatures, tower top pressure 90kPa.A, quantity of circulating water 920m3/h, secondary scrubbing tower, 87 DEG C of tower top temperatures, tower top pressure 88kPa.A, quantity of circulating water 920m3/h, at the bottom of one-level scrubbing tower tower, the sewage of outer row 14m3/h goes coal slurry preparation. Tail gas is cooled to 50 DEG C through air cooler is cooling, recyclable water 105m3/h, 750,000 tons of year recycle-waters. The about 170000Nm3/h of tail gas returns drying unit through recycled offgas blower fan and recycles.
Claims (4)
1. the method from the hot carrier gas recycle-water of brown coal drying, it is characterized in that: entering before scrubbing tower overheated the dry heat carrier gas as tail gas, in scrubbing tower, carry out thermal insulation washing and remove dust, adopt the carrier gas of air cooler condensation heat, the object that reaches recycle-water, process is as follows:
Cross hot exhaust gas, under the effect of blower fan, enter scrubbing tower for 110 DEG C that come from brown coal drying unit; Washing process is completed by two-stage scrubbing tower, under micro-negative pressure, with the recirculated water washing of 80 ~ 90 DEG C, the dust granules in described tail gas is taken off; One-level scrubbing tower is void tower, and Ta Nei establishes multilayer atomizer, and the big dust particle in tail gas is washed down, and secondary scrubbing tower is equipped with filler, removes dust small in tail gas; Washing process is approximately an adiabatic washing process, but because dried tail gas has certain degree of superheat, constantly evaporation of moisture in one-level scrubbing tower, in tower, recirculated water impurity can be constantly concentrated, for preventing fouling in tower, at the bottom of tower, draw one water and go out, prepare water as coal slurry; The feedwater of one-level scrubbing tower is supplemented by secondary scrubbing tower recirculated water, and the feedwater of secondary scrubbing tower is supplemented by air cooler condensed water; Tail gas after washing enters air cooler, indirectly cooling with surrounding air, is cooled to 40 ~ 50 DEG C, and after gas-liquid separation, liquid phase enters water recovery tank, realizes the recovery of water in tail gas, and gas phase is returned drying unit through recycled offgas blower fan and recycled.
2. a kind of method from the hot carrier gas recycle-water of brown coal drying according to claim 1, it is characterized in that: the hot carrier gas of described brown coal drying is 110 DEG C of low-pressure nitrogens with saturated steam that produce in brown coal drying process, the degree of superheat is 5 ~ 10 DEG C, suitable overheated be in order to prevent that tail gas is in transmitting procedure condensation.
3. a kind of method from the hot carrier gas recycle-water of brown coal drying according to claim 1, is characterized in that: with two sections of scrubbing towers, under thermal insulation, washed, can thoroughly the dust washing in tail gas have been got off, ensured follow-up water quality; The pressure that tail gas enters a tower is 91kPa.A, and a column overhead temperature is controlled at 88 DEG C, pressure 90kPa.A, and two column overhead temperature are controlled at 87 DEG C, pressure 88kPa.A.
4. a kind of method from the hot carrier gas recycle-water of brown coal drying according to claim 1, is characterized in that: adopt indirect air cooling device to operate under micro-negative pressure, controlled pressure is at 78kPa.A, and it is 40 ~ 50 DEG C that tail gas goes out air cooler temperature.
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| CN103881784B (en) * | 2014-03-17 | 2015-12-02 | 东华工程科技股份有限公司 | A kind of process of brown coal upgrading tail gas and recovery method |
| CN105536394B (en) * | 2016-01-29 | 2018-08-21 | 神雾科技集团股份有限公司 | Spray column, the brown coal drying smoke processing system equipped with the spray column and its method |
| CN107201258A (en) * | 2017-05-31 | 2017-09-26 | 内蒙古中实能源有限公司 | A kind of upgrading device of low-quality coal and the production method of resource circulation utilization |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101822910A (en) * | 2010-04-21 | 2010-09-08 | 吴植仁 | Method for reclaiming water from dry flue gas of high dew point lignite |
| CN103120877A (en) * | 2013-02-20 | 2013-05-29 | 山东天力干燥股份有限公司 | Dust containing tail gas insulating and washing and water recovery process |
| CN203090688U (en) * | 2013-02-20 | 2013-07-31 | 山东天力干燥股份有限公司 | Heat-insulation washing and water recycling equipment for dusty tail gas |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101822910A (en) * | 2010-04-21 | 2010-09-08 | 吴植仁 | Method for reclaiming water from dry flue gas of high dew point lignite |
| CN103120877A (en) * | 2013-02-20 | 2013-05-29 | 山东天力干燥股份有限公司 | Dust containing tail gas insulating and washing and water recovery process |
| CN203090688U (en) * | 2013-02-20 | 2013-07-31 | 山东天力干燥股份有限公司 | Heat-insulation washing and water recycling equipment for dusty tail gas |
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Address after: 230088 in the high tech Industrial Development Zone, No. 669, Changjiang West Road, Hefei City, Anhui Province Patentee after: EAST CHINA ENGINEERING SCIENCE AND TECHNOLOGY Co.,Ltd. Address before: 230024 No. 70 Wangjiang East Road, Anhui, Hefei Patentee before: EAST CHINA ENGINEERING SCIENCE AND TECHNOLOGY Co.,Ltd. |
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