CN102128548B - Method and equipment for purifying and recovering evaporated vapor obtained by drying coal - Google Patents
Method and equipment for purifying and recovering evaporated vapor obtained by drying coal Download PDFInfo
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- CN102128548B CN102128548B CN2010100463202A CN201010046320A CN102128548B CN 102128548 B CN102128548 B CN 102128548B CN 2010100463202 A CN2010100463202 A CN 2010100463202A CN 201010046320 A CN201010046320 A CN 201010046320A CN 102128548 B CN102128548 B CN 102128548B
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Abstract
The invention relates to a method and equipment for purifying and recovering evaporated vapor obtained by drying coal, which combines three processes of cooling to eliminate humidity, flash evaporation and steam stripping, and vacuum condensation. The method comprises the steps of: receiving high-humidity tail gas preliminarily cooled by a cooling tube and condensate water (5-60 DEG C) pumped by a condensate water pump by using a condensing tower for reverse contact of vapor and liquid, and cooling to eliminate humidity; carrying out vacuum flash evaporation on condensate water (40-100 DEG C) pumped by a flash evaporation pump by using a flash evaporation drum and a defogging washer, dehumidifying the vapor (5-60 DEG C) generated from flash evaporation of the flash evaporation drum in the defogging washer, and then condensating the vapor in an air cooler; and condensating the defogged and washed water of 5-60 DEG C by using the air cooler and a water ring vacuum pump, delivering the recovered condensate water into a recovering water tank, and discharging the vapor which is not condensed. In the invention, no additional supplement of condensate water is required, the condensate water is generated by flash evaporation and steam stripping, the energy required by the system is from the system or the environment, and the energy consumption is reduced.
Description
Technical field
The present invention relates to the coal drying and evaporate the method for purifying and recovering and the employed equipment of this method of steam.
Prior art
The dry vapor evaporated of existing coal adopts emptying mode after the dedusting more; Dedusting technology has two kinds: the one, and dry method dust; With coal dust vapor evaporated (generally containing a small amount of fixed gas and micro-coal dust); Utilize sack cleaner to purify directly emptying of back, steam is not reclaimed; The 2nd, wet dedusting; Coal dust vapor evaporated (generally containing a small amount of fixed gas and micro-coal dust) is adopted wet scrubber; And utilize cold water spray mode to steam lower the temperature, directly emptying after the dedusting, can reclaim part steam, but the spray cooling water yield that needs is big; And the water quality that reclaims contains impurity such as coal dust, and water quality does not reach the standard of utilizing again.
Summary of the invention
Big in view of evaporating the vapour quantity that in the coal dry run, have to recycle to be worth.The object of the present invention is to provide a kind of coal drying to evaporate the method for purifying and recovering of steam.This method through cooling dry, the complete set technology of flash distillation stripping, three kinds of process combination of vacuum condensation, the high humidity tail gas that the coal drying is evaporated is purified recovery.
Another object of the present invention is the equipment that the coal drying evaporates the purification recovery of steam, and wherein: the key equipment of the cooling technology of drying is the condensing tower of gas-liquid contact; The key equipment of flash distillation steam stripping technique is flash tank and demist washer; The key equipment of air cooling technique is air cooler and water ring vacuum pump.
The objective of the invention is to realize through following technical scheme:
A kind of coal drying evaporates the method for purifying and recovering of steam, and its step comprises:
A. cooling is dried
In the cooling tube from coal dust dryer section 90～150 ℃ of high humidity tail gas that are evaporated; With contact preliminary cooling from condensing tower bottom through 40～100 ℃ of condensed waters after the cooling water pump supercharging, the cooling back is from the entering of condensing tower bottom, 5～60 ℃ condensed waters of while from flash tank get into from the condensing tower top under the condensate pump supercharging; And carry out with high humidity tail gas in condensing tower that vapour-liquid is reverse to be contacted; Cooling is dried, and with water vapor condensation in 90～150 ℃ of high humidity tail gas, condensate temperature is 40～100 ℃; Accumulate in the condensing tower bottom, fixed gas is through the discharging of tail gas air-introduced machine;
B. flash distillation stripping
40～100 ℃ of condensed waters that collect in condensing tower (4) bottom are squeezed into after through the supercharging of flash distillation water pump and are carried out the vacuum flashing stripping in the flash tank; The collected condensate temperature of flash distillation is at 5～60 ℃; As dry water and use through squeezing in the condensing tower after the condensate pump supercharging of cooling, 5～60 ℃ of steam that flash off from flash tank get into demist washers dehumidifying back and get into the air cooler condensations;
C. vacuum condensation
Get in the recovery water pot through 5～60 ℃ of water that the air cooler vacuum condensation gets off, incondensible fixed gas is discharged through water ring vacuum pump.Be collected in the fresh water (FW) that reclaims water pot and pass through to reclaim water pump supercharging recycling.
The coal drying evaporates the equipment of the purification recovery of steam, comprising:
A tail gas air-introduced machine is used for discharging the condensing tower fixed gas;
A cooling tube is tentatively lowered the temperature 90～150 ℃ of high humidity tail gas, and feeds condensing tower;
A cooling water pump is squeezed into cooling tube with condensing tower 40～100 ℃ of condensed water superchargings in bottom;
A condensing tower is used for accepting from cooling tube next high humidity tail gas and condensate pump, and 5～60 ℃ of condensed waters from flash tank is squeezed into carry out the reverse contact of vapour-liquid, and cooling is dried, and produces 40～100 ℃ of condensed waters;
A flash distillation water pump is used for supercharging, and 40～100 ℃ of condensed waters of condensing tower (4) bottom are driven in the flash tank;
A condensate pump is with squeezing in the condensing tower after 5～60 ℃ the condensed water supercharging in the flash tank;
A demist washer, 5～60 ℃ of steam that flash off from flash tank 8 get into the condensation of demist washer dehumidifying back entering air cooler;
A flash tank is squeezed into 40～100 ℃ of condensed waters to the flash distillation water pump and is carried out vacuum flashing, and the steam that produces 5～60 ℃ gets into the demist washer, and the condensed water that produces 5～60 ℃ is squeezed in the condensing tower after the condensate pump supercharging;
An air cooler, gets into air cooler and carries out condensation after the dehumidifying of demist washer from 5～60 ℃ of steam that flash tank flashes off;
One is reclaimed water pot, is used for storing 5～60 ℃ of water that get off through the air cooler condensation;
A recovery water pump is used for supercharging, carries the condensed water that reclaims in the water pot;
A water ring vacuum pump is used for discharging fixed gas and returns to reclaiming water pot with the recovery condensed water.
Advantage of the present invention:
(1) the present invention adopts that cooling is dried, the combination of flash distillation stripping, three kinds of routine techniques of vacuum condensation, purifies to reclaim the coal drying and evaporate steam, and equipment adopts routine or standard device, and system is simple, and operability is high.
(2) the present invention and the conventional wet dust removal cooling compared with techniques of drying: do not need extra additional condensed water, condensed water has reduced energy consumption through the generation of flash distillation stripping.
(3) vacuum condensation is compared with the normal pressure air cooling among the present invention; Under normal pressure, adopt measures such as air cooling, water-cooled to be not easy to make 5～60 ℃ of water vapor condensations; And under 0.0008～0.020MPa (A) vacuum, reduce the condensation point of 5～60 ℃ of steam; Make 5～60 ℃ of water vapor condensations easily, also reduced load simultaneously.
(4) water that reclaims among the present invention is that evaporation steam condenses into water, and cleanliness factor is high, is equivalent to distilled water, utilizes scope wide again.
Description of drawings
Fig. 1. be process chart of the present invention.
Reference numeral: 1-tail gas air-introduced machine 2-cooling tube 3-cooling water pump 4-condensing tower 5-flash distillation water pump 6-condensate pump 7-demist washer 8-flash tank 9-air cooler 10-reclaims water pot 11-and reclaims water pump 12-water ring vacuum pump
Fig. 2. be process flow diagram of the present invention
The practical implementation method
Method for purifying and recovering below in conjunction with the coal drying being evaporated steam remakes further description:
Shown in Fig. 1-2; 90～150 ℃ of high humidity tail gas (containing a large amount of steam and a small amount of fixed gas) from the coal dust dryer section; With 40～100 ℃ of condensed waters after through cooling water pump 3 superchargings contact preliminary cooling from condensing tower 4 bottoms, the cooling back gets into from condensing tower 4 bottoms in cooling tube 2.5～60 ℃ of condensed waters from flash tank 8 get into from condensing tower 4 tops under condensate pump 6 superchargings simultaneously; And carry out with high humidity tail gas in condensing tower 4 that vapour-liquid is reverse to be contacted; Lower the temperature and dry; Get off steam condensation in the high humidity tail gas and accumulate in condensing tower 4 bottoms, 40～100 ℃ of condensate temperatures, fixed gas is through 1 discharging of tail gas air-introduced machine.
The condensed water that collects in condensing tower 4 bottoms is squeezed into after through 5 superchargings of flash distillation water pump and is carried out vacuum flashing in the flash tank 8.The steam stripped effect of flash distillation: the one, produce 5～60 ℃ of clean steam, and be condensed into clean recycle-water at air cooler; The 2nd, 40～100 ℃ condensed water is reduced to 5～60 ℃ of condensed waters.Produce the vacuum of 0.0008～0.020MPa (A) in the flash tank 8.Through the flash distillation stripping: the collected condensate temperature of flash distillation is at 5～60 ℃, as dry water and use through squeezing into after condensate pump 6 superchargings in the condensing tower 4 of cooling; After 5～60 ℃ of steam that flash distillation steams get into 7 dehumidifying of demist washer; Under water ring vacuum pump 12 swabbing actions, get into air cooler 9; Produce the vacuum of 0.0008～0.020MPa (A) in the air cooler 9; Water vapor condensation with vacuum flashing under the effect of vacuum condensation becomes being recovered in of 5～60 ℃ of cleanings to reclaim in the water pot 10, is collected in the clean water that reclaims in the water pot 10 and after reclaiming water pump 11 superchargings, utilizes again.Incondensible fixed gas is discharged through water ring vacuum pump 12.Use from reclaiming to draw on water pump 11 outlet lines in one tunnel entering water ring vacuum pump 12 simultaneously, the water after the use returns to reclaiming in the water pot 10.
Claims (4)
1. a coal drying evaporates the method for purifying and recovering of steam, and its step comprises:
A. cooling is dried
In the cooling tube (2) from coal dust dryer section 90～150 ℃ of high humidity tail gas that are evaporated; With contact through 40～100 ℃ of condensed waters after cooling water pump (3) supercharging from condensing tower (4) bottom, preliminary cooling back is from the entering of condensing tower (4) bottom, 5～60 ℃ condensed waters of while from flash tank (8) get into from condensing tower (4) top under condensate pump (6) supercharging; And carry out with high humidity tail gas in condensing tower (4) that vapour-liquid is reverse to be contacted; Cooling is dried, and with water vapor condensation in the high humidity tail gas, condensate temperature is 40～100 ℃; Accumulate in condensing tower (4) bottom, fixed gas is through tail gas air-introduced machine (1) discharging;
B. flash distillation stripping
40～100 ℃ of condensed waters that collect in condensing tower (4) bottom are squeezed in the flash tank (8) after through flash distillation water pump (5) supercharging and are carried out the vacuum flashing stripping; The collected condensate temperature of flash distillation is at 5～60 ℃; Then through after condensate pump (6) supercharging; Get in the condensing tower (4) from condensing tower (4) top, as the cooling water that dries, 5～60 ℃ of steam that flash tank (8) flashes off get into demist washers (7) dehumidifying back and get into air cooler (9) condensation;
C. vacuum condensation
5～60 ℃ of condensed waters that get off through air cooler (9) vacuum condensation get in the recovery water pot (10), and water ring vacuum pump (12) is extracted the fixed gas in flash tank (8) and the air cooler (9) out.
2. a kind of coal drying as claimed in claim 1 evaporates the method for purifying and recovering of steam, and the cooling medium that it is characterized in that air cooler (9) is an air, or cooling water, and air cooler (9) can be forced cooling or natural air cooling.
3. implement the employed equipment of method for purifying and recovering that the described a kind of coal drying of claim 1 evaporates steam for one kind, this equipment comprises:
A tail gas air-introduced machine (1) is used for discharging condensing tower (4) fixed gas;
A cooling tube (2) is tentatively lowered the temperature 90～150 ℃ of high humidity tail gas, and feeds condensing tower (4);
A cooling water pump (3) is squeezed into cooling tube (2) with condensing tower (4) 40～100 ℃ of condensed water superchargings in bottom;
A condensing tower (4) is used for accepting 5～60 ℃ of condensed waters that the high humidity tail gas that comes from cooling tube (2) and condensate pump (6) are squeezed into from flash tank (8), carries out the reverse contact of vapour-liquid, and cooling is dried, and produces 40～100 ℃ of condensed waters;
A flash distillation water pump (5) is used for supercharging, and 40～100 ℃ of condensed waters of condensing tower (4) bottom are driven in the flash tank (8);
A condensate pump (6) is with squeezing in the condensing tower (4) after 5～60 ℃ the condensed water supercharging in the flash tank (8);
A demist washer (7), 5～60 ℃ of steam that flash off from flash tank (8) get into the condensation of demist washer (7) dehumidifying back entering air cooler (9);
A flash tank (8) is squeezed into 40～100 ℃ of condensed waters to flash distillation water pump (5) and is carried out vacuum flashing, and the steam that produces 5～60 ℃ gets into demist washer (7), and the condensed water that produces 5～60 ℃ is squeezed in the condensing tower (4) after condensate pump (6) supercharging;
An air cooler (9), gets into air cooler (9) and carries out condensation after demist washer (7) dehumidifying from 5～60 ℃ of steam that flash tank (8) flashes off;
One is reclaimed water pot (10), is used for storing 5～60 ℃ of water that get off through air cooler (9) condensation;
A recovery water pump (11) is used for supercharging, carries the condensed water that reclaims in the water pot (10);
A water ring vacuum pump (12) is used for discharging fixed gas and returns to reclaiming water pot (10) with the recovery condensed water.
4. a kind of coal drying as claimed in claim 2 evaporates the method for purifying and recovering of steam, it is characterized in that condensing tower (4) adopts sieve-plate tower or packed tower or spray column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100463202A CN102128548B (en) | 2010-01-12 | 2010-01-12 | Method and equipment for purifying and recovering evaporated vapor obtained by drying coal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010100463202A CN102128548B (en) | 2010-01-12 | 2010-01-12 | Method and equipment for purifying and recovering evaporated vapor obtained by drying coal |
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| CN102128548A CN102128548A (en) | 2011-07-20 |
| CN102128548B true CN102128548B (en) | 2012-11-14 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102995702A (en) * | 2011-09-17 | 2013-03-27 | 天华化工机械及自动化研究设计院有限公司 | Method for recovering water vapor evaporated by drying coal by utilizing vacuum condensing cooling method and equipment thereof |
| CN103090675B (en) * | 2011-11-02 | 2014-10-22 | 天华化工机械及自动化研究设计院有限公司 | Continuous vacuum drying and roasting combined method and device thereof |
| CN102847332B (en) * | 2012-10-16 | 2014-06-18 | 石家庄新宇三阳实业有限公司 | Steam condensate residual heat recovery process for vacuum flasher and recovery system thereof |
| CN103968659B (en) * | 2013-01-24 | 2016-08-03 | 天华化工机械及自动化研究设计院有限公司 | A kind of utilize coal to be dried steam discharge to reduce Thermal generation unit coal consumption and the method for Water Sproading |
| CN103206848A (en) * | 2013-03-29 | 2013-07-17 | 华润电力控股有限公司 | System integration method for reducing coal consumption and water consumption in brown coal power plant |
| CN103234214B (en) * | 2013-05-15 | 2015-10-28 | 天华化工机械及自动化研究设计院有限公司 | The fine coal coal gasification powder process of high-moisture coal and Water Sproading integrated system and method thereof |
| CN103540328B (en) * | 2013-11-04 | 2014-12-10 | 山东荣信煤化有限责任公司 | System and method for comprehensive utilization of low-temperature and low-pressure steam discharged from coke quenching tower |
| CN104501576B (en) * | 2015-01-13 | 2016-08-24 | 天华化工机械及自动化研究设计院有限公司 | Utilize indirect air cooling technology to reclaim and be dried vapour system and application process thereof in tail gas |
| CN104501568B (en) * | 2015-01-13 | 2017-01-04 | 天华化工机械及自动化研究设计院有限公司 | A kind of system improving dry tail gas Water Sproading efficiency and application process thereof |
| 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 |
| CN107486462B (en) * | 2017-08-11 | 2023-11-28 | 江苏博莱客冷冻科技发展有限公司 | Vacuum drying purifying treatment equipment containing volatile gas waste |
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Address after: 100011 Beijing city Dongcheng District No. 16 Andrew intercontinental building Shenhua building C block 8 layer Patentee after: Shenhua Group LLC Patentee after: Tianhua Institute of Chemical Machinery & Automation Co., Ltd. Patentee after: National Drying Technology and Equipment Engineering Technology Research Center Patentee after: Ruide Drying Technology Co., Ltd., Lanzhou Address before: 100011 Beijing city Dongcheng District No. 16 Andrew intercontinental building Shenhua building C block 8 layer Patentee before: Shenhua Group LLC Patentee before: Tianhua Chemical Machinery & Automation Research Inst. Patentee before: National Drying Technology and Equipment Engineering Technology Research Center Patentee before: Ruide Drying Technology Co., Ltd., Lanzhou |