CN104197692A - Drying system and method for mercury catalyst production tail gas recycling - Google Patents
Drying system and method for mercury catalyst production tail gas recycling Download PDFInfo
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- CN104197692A CN104197692A CN201410379808.5A CN201410379808A CN104197692A CN 104197692 A CN104197692 A CN 104197692A CN 201410379808 A CN201410379808 A CN 201410379808A CN 104197692 A CN104197692 A CN 104197692A
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Abstract
The invention discloses a drying system and method for mercury catalyst production tail gas recycling. The drying system is composed of an induced draft fan, an electric furnace, a drying furnace, an activated carbon adsorption tower and a washing tower. An outlet of the induced draft fan is connected with an inlet of the electric furnace. An outlet of the electric furnace is connected with an inlet of the drying furnace. The drying furnace is connected with an inlet of the washing tower through the activated carbon adsorption tower. A pre-drying furnace and an air blower which are connected in sequence are arranged between the drying furnace and the activated carbon adsorption tower. The washing tower and an inlet of the induced draft fan are communicated through a gas and water separator to form a closed loop. The drying method mainly includes the steps of tail gas heating, catalyst drying and dust removal. Washed tail gas is introduced to the gas and water separator, and dry air can be obtained and then is fed to a hot blast heater through the induced draft fan, so that tail gas is recycled, the emission amount is reduced, environmental pollution is reduced, the drying time is shortened, and the heavy metal pollution emission amount is controlled effectively.
Description
Technical field
The invention belongs to mercury catalyst production technical field, specifically relate to a kind of mercury catalyst production circulation of tail gas and utilize drying system and drying means thereof.
Background technology
The production of mercury catalyst mainly comprises immersion, coolly puts, is dried, packs four processes, and wherein drying process is the key link that mercury catalyst is produced, and the quality of drying process directly has influence on drying and dewatering efficiency and the product quality of mercury catalyst.At present, the drying process that mercury catalyst is produced normally adopts air-introduced machine that air suction electric central warm air furnace is heated, make gas temperature reach 150 ℃ of left and right, then make hot blast enter successively drying oven and predrying stove, catalyst in drying oven and predrying stove can remove respectively in catalyst approximately 99.7% and 80% moisture content after by the high temperature evaporation of 4 hours, after catalyst moisture content in drying oven is qualified, enter packaging process, catalyst in predrying stove enters drying oven and is dried, the tail gas of predrying stove enters scrubbing tower again and carries out qualified discharge after dust removal process after activated carbon absorption tower.
In above-mentioned mercury catalyst production technology, because dried tail gas directly discharges, in tail gas with the harmful substances such as mercury, mercury chloride also enter in atmosphere simultaneously, although be through processing qualified discharge, but total amount increases, cause heavy metals emission amount to increase, to environment, can cause certain influence, have certain potential safety hazard; Simultaneously, because being directly passes through air-introduced machine extracting air, by electric central warm air furnace, heat again, because carrying large quantity of moisture in air secretly, the moisture that in last preheating gas, condensation is got off is absorbed by catalyst again, makes the dry overlong time of every stove, and can not remove moisture completely, therefore, catalyst drying and dewatering efficiency is lower, and energy consumption is higher.
Summary of the invention
For addressing the above problem, the invention provides a kind of mercury catalyst production circulation of tail gas and utilize drying system and drying means thereof.Thereby effectively reduce the discharge of tail gas, greatly reduce drying time, improve catalyst drying and dewatering efficiency.
The present invention is achieved by following technical solution.
A kind of mercury catalyst is produced circulation of tail gas and is utilized drying system, mainly by air-introduced machine, electric central warm air furnace, drying oven, activated carbon absorption tower and scrubbing tower, formed, the outlet of described air-introduced machine is connected with the import of electric central warm air furnace, the outlet of electric central warm air furnace is connected with the import of drying oven, drying oven is connected with the import of scrubbing tower through activated carbon absorption tower, predrying stove and the air blast being connected successively is also set between described drying oven and activated carbon absorption tower, and described scrubbing tower is communicated with formation closed-loop path through moisture trap with the import of air-introduced machine.
The outlet of described scrubbing tower is connected with tail gas blow-down pipe, on tail gas blow-down pipe, is provided with perforate, is connected with the circulating line A matching with perforate aperture in perforate, by circulating line A, scrubbing tower is communicated with moisture trap.
Described activated carbon absorption tower is comprised of the I level active carbon adsorption tower being connected successively, II level active carbon adsorption tower and III level active carbon adsorption tower.
The outlet of described moisture trap is connected with the import of air-introduced machine by circulating line B.
The top of described moisture trap is provided with exhaust outlet.
Described moisture trap bottom is provided with for discharging the blowoff valve of hydrops.
Described scrubbing tower and tail gas blow-down pipe all adopt PP material to make.
As another object of the present invention, also provide a kind of mercury catalyst to produce circulation of tail gas and utilized drying means, it mainly comprises following processing step:
(1) tail gas heating: tail gas enters air-introduced machine entrance by circulating line B enters electric central warm air furnace heating after air-introduced machine, makes gas temperature reach 120～150 ℃;
(2) catalyst is dried: from electric furnace step (1) Suo Shu, out hot blast enters drying oven and pre-dry stove successively, catalyst in drying oven by hot air seasoning after, obtain entering packaging process after catalyst that moisture content is qualified, the hot air temperature of coming from drying oven is 80～100 ℃ and carries out predrying to catalyst predrying stove;
(3) dust removal process: enter scrubbing tower from predrying stove tail gas out after I level active carbon adsorption tower, II level active carbon adsorption tower and III level active carbon adsorption tower and carry out dust removal process, and enter moisture trap by circulating line A and recycle.
In described step (3), from predrying stove exhaust temperature out, it is 40～60 ℃.
The invention has the beneficial effects as follows:
Compared with prior art, the present invention is by carrying out process modification to air-introduced machine entrance, tail gas by after washing is introduced to moisture trap, can obtain dry gas, then send into hot-blast stove by air-introduced machine, tail gas is recycled, not only reduce discharge capacity, reduced environmental pollution, and reduced the dry time, every stove can be saved about 1 hour, and catalyst per ton can be saved 120 yuan/ton.Both environmental, also created benefit simultaneously; The present invention recycles the tail gas that contains mercury in mercury catalyst production process, effectively controls heavy metal pollution discharge capacity, has arrived the effect of energy-saving and emission-reduction, has good Social benefit and economic benefit, can be in chemical technology field wide popularization and application.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure: 1-air-introduced machine, 2-electric central warm air furnace, 3-drying oven, the predrying stove of 4-, 5-air blast, 6-activated carbon absorption tower, 7-scrubbing tower, 8-tail gas blow-down pipe, 9-circulating line A, 10-moisture trap, 11-circulating line B, 61-I level active carbon adsorption tower, 62-II level active carbon adsorption tower, 63-III level active carbon adsorption tower.
The specific embodiment
Below in conjunction with accompanying drawing, further describe technical scheme of the present invention, but described in claimed scope is not limited to.
As shown in Figure 1, a kind of mercury catalyst of the present invention is produced circulation of tail gas and is utilized drying system, mainly by air-introduced machine 1, electric central warm air furnace 2, drying oven 3, activated carbon absorption tower 6 and scrubbing tower 7 form, the outlet of described air-introduced machine 1 is connected with the import of electric central warm air furnace 2, the outlet of electric central warm air furnace 2 is connected with the import of drying oven 3, drying oven 3 is connected with the import of scrubbing tower 7 through activated carbon absorption tower 6, predrying stove 4 and the air blast 5 being connected successively is also set between described drying oven 3 and activated carbon absorption tower 6, described scrubbing tower 7 is communicated with the import of air-introduced machine 1 and forms closed-loop path through moisture trap 10.Adopt the technical program, to introduce moisture trap 10 by the tail gas after scrubbing tower 7 washings, can obtain dry gas, by air-introduced machine 1, send into hot-blast stove 2 again, tail gas is recycled, not only reduced discharge capacity, reduced environmental pollution, and reduced the dry time, and every stove can be saved about 1 hour, and catalyst per ton can be saved 120 yuan/ton.
The outlet of described scrubbing tower 7 is connected with tail gas blow-down pipe 8, on tail gas blow-down pipe 8, is provided with perforate, is connected with the circulating line A9 matching with perforate aperture in perforate, by circulating line A9, scrubbing tower 7 is communicated with moisture trap 10.
Described activated carbon absorption tower 6 is comprised of the I level active carbon adsorption tower 61 being connected successively, II level active carbon adsorption tower 62 and III level active carbon adsorption tower 63.
The outlet of described moisture trap 10 is connected with the import of air-introduced machine 1 by circulating line B11.
The top of described moisture trap 10 is provided with exhaust outlet.Like this, when work, tail gas enters in container from moisture trap 10 tops, because the proportion (air molecule amount is 29) of air will weigh than the proportion of hydrone (molecular weight of H2O is 18), tail, by overexpansion He San road dividing plate, utilizes buffering with Action of Gravity Field, the moisture content of carrying secretly is separated along cylindrical shell, in moisture trap 10 bottoms, obtains dry tail gas, tail gas enters from the mouth of pipe of the distance apart from moisture trap bottom 400MM, from the exhaust outlet on moisture trap 10 tops, discharges.
Described moisture trap 10 bottoms are provided with for discharging the blowoff valve of hydrops.
Described scrubbing tower 7 and tail gas blow-down pipe 8 all adopt PP material to make.
As another object of the present invention, also provide a kind of mercury catalyst to produce circulation of tail gas and utilized drying means, it mainly comprises following processing step:
(1) tail gas heating: tail gas enters air-introduced machine 1 entrance by circulating line B11 enters electric central warm air furnace 2 heating after air-introduced machine 1, makes gas temperature reach 120～150 ℃;
(2) catalyst is dried: from the electric furnace 2 step (1) Suo Shu, out hot blast enters drying oven 3 and pre-dry stove 4 successively, catalyst in drying oven 3 by hot air seasoning after, obtain entering packaging process after catalyst that moisture content is qualified, the hot air temperature of coming from drying oven 3 is 80～100 ℃ and carries out predrying to catalyst predrying stove 4;
(3) dust removal process: enter scrubbing tower 9 from predrying stove 4 tail gas out after I level active carbon adsorption tower 61, II level active carbon adsorption tower 62 and III level active carbon adsorption tower 63 and carry out dust removal process, and enter moisture trap 10 by circulating line A9 and recycle.
In described step (3), from predrying stove 4 exhaust temperature out, it is 40～60 ℃.
Embodiments of the invention: as shown in Figure 1, the present invention is when application, described scrubbing tower 7 and outlet all adopt PP material to make, scrubbing tower 7 outlets connect tail gas blow-down pipe 8, the caliber of tail gas blow-down pipe 8 is 700mm, on blow-down pipe, open the hole that diameter is 700mm, and the PP that connection diameter is 700mm in perforate pipe, and be 1500mm by PP pipe access diameter, the top of the moisture trap 10 of high-order 2000mm, tail gas is entered in container from moisture trap 10 tops, because the proportion (air molecule amount is 29) of air will weigh than the proportion of hydrone (molecular weight of H2O is 18), tail is by overexpansion He San road dividing plate, utilize buffering with Action of Gravity Field, the moisture content of carrying secretly is separated along cylindrical shell, moisture trap 10 bottoms just obtain dry tail gas, tail gas enters from the mouth of pipe apart from moisture trap 10 bottom 400mm distances, and discharge from the exhaust outlet on moisture trap 10 tops, by being arranged on the blowoff valve discharge hydrops of moisture trap 10 bottoms, the PP pipeline that tail gas is 700mm by diameter enters air-introduced machine 1 entrance, and enter electric central warm air furnace 2 heating, make gas temperature reach 150 ℃ of left and right, hot blast enters drying oven 3 and pre-dry stove 4 successively, catalyst in drying oven 3 by hot air seasoning after, obtain entering packaging process after catalyst that moisture content is qualified, approximately 80 ℃ of left and right of the hot gas of coming from drying oven 3 are carried out predrying to catalyst predrying stove 4, about approximately 40 ℃ process I level active carbon adsorption towers 61 of the tail gas of predrying stove 4, II level active carbon adsorption tower 62 and III level active carbon adsorption tower 63, entering scrubbing tower 7 carries out entering moisture trap 10 after dust removal process and recycles again.
Claims (9)
1. a mercury catalyst is produced circulation of tail gas and is utilized drying system, mainly by air-introduced machine (1), electric central warm air furnace (2), drying oven (3), activated carbon absorption tower (6) and scrubbing tower (7) form, the outlet of described air-introduced machine (1) is connected with the import of electric central warm air furnace (2), the outlet of electric central warm air furnace (2) is connected with the import of drying oven (3), drying oven (3) is connected with the import of scrubbing tower (7) through activated carbon absorption tower (6), it is characterized in that: predrying stove (4) and the air blast (5) being connected successively is also set between described drying oven (3) and activated carbon absorption tower (6), described scrubbing tower (7) is communicated with the import of air-introduced machine (1) and forms closed-loop path through moisture trap (10).
2. a kind of mercury catalyst according to claim 1 is produced circulation of tail gas and is utilized drying system, it is characterized in that: the outlet of described scrubbing tower (7) is connected with tail gas blow-down pipe (8), on tail gas blow-down pipe (8), be provided with perforate, in perforate, be connected with the circulating line A (9) matching with perforate aperture, by circulating line A (9), scrubbing tower (7) be communicated with moisture trap (10).
3. a kind of mercury catalyst according to claim 1 is produced circulation of tail gas and is utilized drying system, it is characterized in that: described activated carbon absorption tower (6) is comprised of the I level active carbon adsorption tower (61) being connected successively, II level active carbon adsorption tower (62) and III level active carbon adsorption tower (63).
4. a kind of mercury catalyst according to claim 1 is produced circulation of tail gas and is utilized drying system, it is characterized in that: the outlet of described moisture trap (10) is connected with the import of air-introduced machine (1) by circulating line B (11).
5. a kind of mercury catalyst according to claim 1 is produced circulation of tail gas and is utilized drying system, it is characterized in that: the top of described moisture trap (10) is provided with exhaust outlet.
6. a kind of mercury catalyst according to claim 1 is produced circulation of tail gas and is utilized drying system, it is characterized in that: described moisture trap (10) bottom is provided with for discharging the blowoff valve of hydrops.
7. a kind of mercury catalyst according to claim 2 is produced circulation of tail gas and is utilized drying system, it is characterized in that: described scrubbing tower (7) and tail gas blow-down pipe (8) all adopt PP material to make.
8. mercury catalyst is produced circulation of tail gas and is utilized a drying means, it is characterized in that: mainly comprise following processing step:
(1) tail gas heating: tail gas enters air-introduced machine (1) entrance by circulating line B (11) enters electric central warm air furnace (2) heating after air-introduced machine (1), makes gas temperature reach 120～150 ℃;
(2) catalyst is dried: from the electric furnace (2) step (1) Suo Shu, out hot blast enters drying oven (3) and pre-dry stove (4) successively, catalyst in drying oven (3) by hot air seasoning after, obtain entering packaging process after catalyst that moisture content is qualified, the hot air temperature of coming from drying oven (3) is 80～100 ℃ and carries out predrying to catalyst predrying stove (4);
(3) dust removal process: enter scrubbing tower (9) from predrying stove (4) tail gas out after I level active carbon adsorption tower (61), II level active carbon adsorption tower (62) and III level active carbon adsorption tower (63) and carry out dust removal process, and enter moisture trap (10) by circulating line A (9) and recycle.
9. a kind of mercury catalyst according to claim 8 is produced circulation of tail gas and is utilized drying means, it is characterized in that: in described step (3), from predrying stove 4 exhaust temperature out, be 40～60 ℃.
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Cited By (3)
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| CN106196922A (en) * | 2016-08-05 | 2016-12-07 | 贵州省铜仁市万山区鸿发化工有限公司 | A kind of mercury catalyst switch type hot-air drying stove |
| CN109990460A (en) * | 2019-04-08 | 2019-07-09 | 东莞市天伟节能环保技术有限公司 | A kind of circulating heat supply system and its heat supply method |
| CN115070989A (en) * | 2022-06-02 | 2022-09-20 | 天津大沽化工股份有限公司 | System and method for drying EPS in closed gas circulation mode |
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Cited By (4)
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| CN115070989A (en) * | 2022-06-02 | 2022-09-20 | 天津大沽化工股份有限公司 | System and method for drying EPS in closed gas circulation mode |
| CN115070989B (en) * | 2022-06-02 | 2024-06-25 | 天津大沽化工股份有限公司 | System and method for drying EPS (expandable polystyrene) by gas closed cycle |
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