CN111249884B - Waste gas purification device and process for coal pulping system - Google Patents
Waste gas purification device and process for coal pulping system Download PDFInfo
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- CN111249884B CN111249884B CN201811466076.8A CN201811466076A CN111249884B CN 111249884 B CN111249884 B CN 111249884B CN 201811466076 A CN201811466076 A CN 201811466076A CN 111249884 B CN111249884 B CN 111249884B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/58—Ammonia
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/72—Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Abstract
The invention provides a waste gas purification device and a waste gas purification process for a coal pulping system. The waste gas purification tower of the treatment system has excellent purification treatment capacity, and the treated waste gas of the coal pulping system can meet the tail gas emission standard and can obviously reduce the generation amount of waste water. The process comprises the following steps: waste gas is collected by a centrifugal negative extractor, then enters a purification tower to be fully contacted with circulating liquid sprayed by a high-efficiency conical nozzle on a gas-liquid flow distributor, and fresh liquid of a groove type water distributor is subjected to secondary absorption treatment. The absorbed waste gas is directly discharged outside to reach the discharge standard. And part of the tower bottom circulating liquid is discharged to a wastewater treatment process, and the part of the tower bottom circulating liquid exchanges heat and returns to the interior of the purification tower again. The invention also provides the absorption liquid used by the method, which has the characteristics of high efficiency, multiple functions, low cost and the like.
Description
Technical Field
The invention belongs to the technical field of chemical waste gas treatment, and relates to a waste gas purification device and process for a coal pulping system.
Background
Coal water slurry (CWM) is a clean coal-based fluid fuel prepared from about 63 wt% of raw coal with different particle size distributions, 36 wt% of water and about 1 wt% of additives through a coal slurrying process. The coal water slurry gasification technology changes solid coal fuel into fluidized coal fuel, so that the coal water slurry gasification technology has the application characteristic of liquid combustion similar to heavy oil, greatly promotes the clean utilization of coal, and can obtain better environmental benefit and considerable oil-replacing economic benefit and energy-saving benefit.
However, the coal gasification industry generally has the current situation that industrial chain wastewater is difficult to treat, and for this reason, the coal pulping system also takes charge of treating the industrial chain wastewater. The coal pulping system is an open system, the components of the wastewater are complex, the wastewater comprises nitrophenol wastewater, methanol washing water, sulfur recovery wastewater, biochemical sludge and the like, and the volatile waste gas (containing NH)3、CH3OH, nitrophenol, and the like) are inevitably discharged in the environment, so that the risk of poisoning personnel and the problem of environmental protection are caused. Volatile waste gas (containing NH) of coal pulping system3、CH3OH, nitrophenol, etc.) has become a difficult problem to be solved in the coal water slurry gasification industry.
The waste gas purification tower is a common waste gas treatment device, and the pollutants in the waste gas are intercepted into the absorption liquid through gas-liquid mass transfer by utilizing the contact of the absorption liquid and the waste gas, so that the concentration of the pollutants in the waste gas is reduced. Conventional exhaust purification tower, absorption liquid in the tower use a period of time after, absorption efficiency descends, need to change the absorption efficiency that the absorption liquid just can resume the design, and in an absorption liquid change cycle, the treatment effeciency of purifying tower can fluctuate from top to bottom, improves absorption liquid change frequency and can keep treatment effeciency relatively stable, nevertheless causes the absorption liquid use amount to increase, and the discarded absorption liquid treatment capacity increases simultaneously, causes the waste.
Adopt multistage waste gas washing tower among patent CN104307313A, including a plurality of waste gas washing towers that the series connection set up, every waste gas washing tower includes a tower body, a water tank, a circulating pump and shower, and the circulating pump is connected and is formed water circulation circuit between water tank and shower. Although the scheme can better ensure the waste gas purification treatment effect, the problems of large occupied area, long process flow and the like exist at the same time.
Disclosure of Invention
The invention aims to provide a waste gas purification device and a waste gas purification process of a coal pulping system, which adopt physical absorption to purify waste gas, optimize the structure of a waste gas purification tower, provide high-efficiency, multifunctional and low-cost absorption liquid, improve the purification effect in waste gas purification, ensure that the content of pollutants in tail gas reaches the emission standard, reduce the generation amount of waste liquid, reduce the occupied area and improve the resource utilization rate.
Meanwhile, the invention also provides the absorption liquid used by the method, which has the characteristics of high efficiency, multiple functions, low cost and the like.
The invention achieves the above purpose through the following technical scheme:
a waste gas purifying device of a coal pulping system comprises a waste gas purifying tower, a centrifugal negative pumping machine, a circulating water pump, a waste water outward-feeding pump and a circulating water heat exchanger, wherein the waste gas purifying tower is provided with an air inlet, an air outlet, a fresh absorption liquid inlet, a first discharging port and a second discharging port,
wherein the centrifugal suction machine is connected with an air inlet of the waste gas purification tower, a first discharge port of the waste gas purification tower is connected with an inlet of a circulating water heat exchanger through a circulating water pump, an outlet of the circulating water heat exchanger returns to the inside of a tower body of the waste gas purification tower through a pipeline, a second discharge port of the waste gas purification tower is connected with a waste water treatment system through a waste water outward-feeding pump,
the waste gas purification tower comprises a tower body, the lower part of the tower body is provided with an air inlet and a first discharge port, the top of the tower body is provided with an air outlet, the bottom of the tower body is provided with a second discharge port,
the inside of the tower body comprises a fresh absorption liquid absorption section positioned at the upper part of the tower body and a circulating liquid absorption section positioned at the middle part or the lower part of the tower body, a silk screen wiper is arranged above the fresh absorption liquid absorption section, the fresh absorption liquid absorption section is provided with a water distributor (preferably a groove distributor, such as an improved integral calandria liquid distributor described by Zhuju incense in structural improvement of a liquid distributor in a packed tower) communicated with a fresh absorption liquid inlet, and one or more packing support screen plates filled with packing;
the circulating liquid absorption section is provided with a gas-liquid flow uniform distribution device,
and a circulating liquid nozzle is arranged between the fresh absorption liquid absorption section and the circulating liquid absorption section and is connected with the outlet of the circulating water heat exchanger through a pipeline.
Furthermore, the water distributor is a groove type distributor, the top packing layer adopts random packing, preferably terai packing, so that the absorption effect of fresh absorption liquid on waste gas is ensured, and gas entrainment is reduced.
Furthermore, a plurality of gas-liquid flow uniform distribution devices are arranged between a circulating liquid nozzle (circulating liquid spraying device) and a waste gas inlet in the circulating absorption section, each gas-liquid flow uniform distribution device comprises a plurality of drainage rods horizontally arranged at intervals, and the cross sections of the drainage rods are of inverted Y-shaped structures.
And a circulating liquid nozzle is arranged between the fresh absorption liquid absorption section and the circulating liquid absorption section, preferably, a high-efficiency nozzle is arranged, and the high-efficiency nozzle is connected with circulating water arranged in the tower kettle through an acid-base resistant pipeline and a circulating water pump.
The composition of the waste gas comprises 50-150 ppm of ammonia (emission threshold standard is less than 25ppm), 100-200 ppm of methanol (emission threshold standard is less than 130ppm), extremely low gas content (not detected) of other components and extremely low dust particle content (not detected by an analysis method). The exhaust gas component is mainly NH3And CH3OH, NH in the exhaust gas3Content of 50-150 ppm, CH3OH content of 100-200 ppm, nitrophenol content of 10-20 ppm, and optionally CH3COCH3、CH3CH2OCH2CH3、CH3CH(OH)CH2OH、H2S、CO2、N2One or more (e.g., three or more) of n-pentane and isopentane. CH (CH)3COCH3The content is generally 5 to 10 ppm.
Waste gas enters from an air inlet at the lower part of the waste gas purification tower, moves upwards in the tower, and is in countercurrent contact with circulating liquid sprayed by a nozzle, and after part of pollutants in the waste gas are purified and absorbed, the waste gas is fully contacted with fresh absorption liquid flowing out from a groove type distributor again through a packing layer of a fresh absorption liquid absorption section, so that the purification effect is achieved. And finally, discharging the clean gas after the final treatment through an air outlet.
Preferably, the included angle between the gas-liquid flow distribution drainage rod and the central line of the waste gas inlet channel is 90 +/-5 degrees, and the arrangement of the gas-liquid flow distribution drainage rod from one side close to the waste gas inlet channel to one side far away from the waste gas inlet channel is changed from dense to sparse. And the rectification effect is optimized according to the gas quantity condition, so that the waste gas is fully contacted with the circulating liquid.
Preferably, the ratio of the sum of the areas of gaps between the drainage rods of the gas-liquid flow uniform distribution device to the cross-sectional area of the corresponding position of the absorption tower barrel is 45-75%, and the optimal ratio is 50-60%, so that the gas flow in the absorption tower is reasonably and uniformly distributed under the condition that the contact of circulating liquid and waste gas is not influenced.
Preferably, the inverted Y-shaped vertex angle of the backflow rod is 35-75 degrees, the height from the inverted Y-shaped vertex angle to the bottom of the flow guide rod is 200-400 mm, the best inverted Y-shaped vertex angle of the flow guide rod is 45-65 degrees, and the height from the inverted Y-shaped vertex angle to the bottom of the flow guide rod is 250-350 mm. The gas flow in the absorption tower is effectively adjusted, the contact time and the contact area of the waste gas and the circulating liquid are increased, and the utilization rate of the circulating liquid is improved.
Preferably, the circulating liquid nozzle that this exhaust gas purification tower set up chooses the toper nozzle structure for use, can provide the higher dynamic pressure energy of fluid, has better entrainment effect to surrounding gas for the gaseous speed all around is higher. And simultaneously, optimizing the contraction angle of the conical nozzle structure, wherein the contraction angle is 0-90 degrees, preferably 60-90 degrees, so as to obtain the optimal initial atomization cone angle. Meanwhile, an airflow channel is added in the nozzle, and high-pressure air is added as an atomizing medium to directly impact the liquid surface to accelerate the breaking of liquid drops, so that the atomizing quality is improved.
Preferably, the tower body is provided with a discharge port and a detection port so as to facilitate observation of the spraying state in the tower body and replacement of the filler.
Preferably, the filler is a telapry filler. The terafilleris a high-efficiency low-pressure-loss filling material, the shape of the filler is like a screw winding, the absorption effect of the filler is better than that of a tubular filling material, the static pressure loss can be reduced by 40-50% under the same volume, the volume can be reduced by 35-50% under the same pressure drop, the porosity is large, the material transfer coefficient is high, and the treatment efficiency is improved by 26-35% compared with other filling materials.
The invention further provides a waste gas purification process of a coal pulping system, which uses the device, and the process comprises the following steps:
(A) the waste gas is collected by a centrifugal suction machine, then passes through an air inlet of a waste gas purification tower, a gas-liquid flow distributor and a filler layer arranged in a filler support screen plate, and is in full gas-liquid contact with circulating liquid sprayed from a circulating liquid nozzle and absorption liquid distributed from a water distributor in sequence, and the purified waste gas is absorbed and discharged to the atmosphere;
(B) part of tower bottom liquid after absorbing the pollutants passes through a circulating liquid pump, a circulating liquid heat exchanger and a pipeline and then is sprayed into the tower body again through a circulating liquid nozzle;
(C) and partial tower bottoms are conveyed to a waste liquid treatment system through a waste liquid conveying pump.
Preferably, the ammonia content in the circulating liquid for spray absorption in the invention is 0.05-4%, preferably 0.5-2%, and the methanol content is 0.05-4%, preferably 0.75-3%.
Preferably, the temperature of the circulating liquid passing through the heat exchanger is 30-50 ℃, and the preferred temperature is 30-35 ℃.
Preferably, the absorption liquid comprises 1-10 wt% of sulfamic acid, 1-5 wt% of organic acid active agent and 85-95 wt% of water, and the preferable content of the sulfamic acid is 4-6 wt%, the content of the organic acid active agent is 2-4 wt%, and the content of the water is 90-94 wt%.
The absorption liquid is characterized in that the sulfamic acid has the characteristics of non-volatility, no odor and less toxicity to human bodies, contains bifunctional substances of amino and sulfonic acid groups, and can perform a plurality of related chemical reactions, wherein the sulfamic acid can react with ammonia to generate ammonium sulfamate and can also respectively perform addition reaction with nitrophenol and methanol, and the related reaction equation is as follows:
HSO3NH2+CH3OH→CH3OSO2ONH4
HSO3NH2+NO3C6H4OH→NO3C6H4OSO2ONH4
HSO3NH2+NH3→NH4SO3NH2
preferably, the organic acid active agent in the invention is one or more of sodium dodecyl benzene sulfonate, rhamnose and saponin. Can effectively promote the absorption of NH by the sulfonylamino acid3、CH3OH, nitrophenol and the like, so that the reaction rate is improved, reaction products can be well absorbed, and the corrosion of equipment pipelines and the like caused by the separation of the reaction products is avoided.
Preferably, the absorption liquid is characterized in that the total acid concentration in the absorption liquid is 1-15 wt%.
Preferably, the absorption liquid in the invention is added with 0.01-2.5 wt% of corrosion inhibitor and 0.01-2.5 wt% of defoaming agent. Wherein, the corrosion inhibitor can be selected from one or more of benzotriazole, phosphonic acid, silicate, polyphosphate and chromate, and the defoaming agent can be selected from one or more of tributyl phosphate, dimethyl silicon oil and polyoxyethylene oxypropylene glycerol.
Preferably, the absorbent solution of the present invention is characterized in that the pH of the absorbent solution is controlled to be 6 to 8.
The invention also relates to the absorption liquid for absorbing the waste gas of the coal pulping system.
Compared with the prior art, the invention has the advantages that: according to the waste gas purification tower of the coal pulping system, waste gas flows in the purification tower in a forward direction, the absorption liquid is continuously added and flows in the tower in a reverse series manner, the waste gas is firstly contacted with the absorption liquid with higher primary pollutant concentration and is finally contacted with the clean absorption liquid, the stability of the treatment efficiency is ensured, the absorption efficiency of the absorption liquid is improved, the emission of the waste gas reaches the environmental protection standard, and meanwhile, the generation of waste liquid is reduced.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of an exhaust gas purification tower of a coal slurrying system of the present invention.
FIG. 2 is a schematic diagram of the configuration of the inventive exhaust treatment system of the coal slurrying system.
Fig. 3 is a cross-sectional view of a conical nozzle.
Detailed Description
The invention is further illustrated by the following examples.
As shown in fig. 1-3, a waste gas purification device of a coal slurrying system comprises a waste gas purification tower 1, a centrifugal negative pumping machine 11, a circulating water pump 12, a waste water outward-feeding pump 13 and a circulating water heat exchanger, wherein 14 the waste gas purification tower is provided with an air inlet 2, an air outlet 3, a fresh absorption liquid inlet 5, a first discharge port 15 and a second discharge port 16,
wherein the centrifugal negative pumping machine 11 is connected with the air inlet 2 of the waste gas purification tower 1, the first discharge port 15 of the waste gas purification tower 1 is connected with the inlet of the circulating water heat exchanger 14 through the circulating water pump 12, the outlet of the circulating water heat exchanger 14 is returned to the tower body of the waste gas purification tower 1 through the pipeline, namely the acid and alkali resistant pipeline 9, the second discharge port 15 of the waste gas purification tower 1 is connected with the waste water treatment system through the waste water outward-feeding pump 13,
the waste gas purification tower comprises a tower body, the lower part of the tower body is provided with an air inlet 2 and a first discharge port 15, the top part is provided with an air outlet 3, the bottom part is provided with a second discharge port 16,
the inside of the tower body comprises a fresh absorption liquid absorption section positioned at the upper part of the tower body and a circulating liquid absorption section positioned at the middle part or the lower part of the tower body, a silk screen wiper 4 is arranged above the fresh absorption liquid absorption section, the fresh absorption liquid absorption section is provided with a water distributor (preferably a groove distributor) communicated with a fresh absorption liquid inlet 5, and one or more filler support screen plates 6 filled with fillers;
the circulating liquid absorption section is provided with a gas-liquid flow uniform distribution device 7,
and a circulating liquid nozzle 8 is arranged between the fresh absorption liquid absorption section and the circulating liquid absorption section, is connected with the outlet of the circulating water heat exchanger through a pipeline and is used for spraying circulating liquid.
Angle alpha in fig. 3 is the angle of contraction of the conical nozzle, with compressed air around the nozzle, entrained into the liquid phase along the outer wall of the nozzle.
Example 1
As shown in fig. 1, the waste gas purifying tower 1 of the present embodiment includes a tower body, an air inlet 2 is disposed at the bottom of the tower body, an air outlet 3 and a wire mesh demister 4 are disposed at the top of the tower body, a fresh absorption liquid inlet 5, and a trough distributor 18. Two filler supporting screen plates 6 are arranged in the tower body, fillers are placed on the filler supporting screen plates 6 to form a filler layer, and a nozzle (circulating liquid spraying nozzle device) 8 is arranged between the fresh absorption liquid absorption section and the circulating liquid absorption section; a plurality of gas-liquid flow uniform distribution devices 7 are arranged between a circulating liquid spray nozzle device (nozzle 8) and a waste gas inlet (air inlet 2) at the circulating absorption section; the nozzle 8 is connected with a circulating water discharge port (a second discharge port 16) arranged at the bottom of the tower through an acid and alkali resistant pipeline 9 and a circulating water pump 12 (the filling is not shown in the figure).
The waste gas purification tower is provided with a centrifugal machine negative pumping device 11, frequency conversion is adjusted, and energy conservation is achieved while the negative pumping effect is guaranteed. A circulating water pump 12 and a waste water outward-feeding pump 13 are provided. Meanwhile, a circulating water heat exchanger 14 is arranged to ensure the absorption effect of the circulating absorption liquid.
The tower body is provided with a first and a second discharge port 15, 16 and a detection port 17.
The filler is terazor filler.
The angle alpha in fig. 3 is the contraction angle of the conical nozzle, the compressed air is arranged at the periphery of the nozzle and is entrained into the liquid phase along the outer wall of the nozzle, and the liquid flow has high spraying speed and good atomization effect.
Referring to fig. 1 and 2, the coal slurrying exhaust gas purification system discharges the air after sequentially passing through a centrifugal negative extractor 11, an air inlet 2, a gas-liquid flow uniform distribution device 7, a packing layer 6, a wire mesh demister 4 and an air outlet 3 arranged at the top along the air flow direction. Along the liquid flow direction, after passing through a fresh absorption liquid inlet 5, a packing layer 6, a packing layer 7 and a second discharge port 16, part of the fresh absorption liquid passes through a circulating water pump 12, a circulating water heat exchanger 14, an acid and alkali resistant pipeline 9 and a circulating liquid nozzle 8 and then enters the tower body 1 again, and part of tower bottom liquid is conveyed to a wastewater treatment process through a wastewater conveying pump 13.
20000Nm3105ppmNH in waste gas of coal pulping system3、120ppmCH3OH, 30ppm nitrophenol, 10ppm CHs3COCH3Wherein the included angle between drainage rods and the central line of the waste gas inlet channel in the gas-liquid flow uniform distribution device is 90 degrees, the ratio of the area sum of gaps between the drainage rods to the cross sectional area of the corresponding part of the absorption tower cylinder is 50 percent, the inverted Y-shaped vertex angle of the backflow rod is 45 degrees, and the height of the flow guide rod from the inverted Y-shaped vertex angle to the bottom is 300 mm. The nozzle in the tower is a high-efficiency conical nozzle, and the contraction angle of the nozzle is 90 degrees. The fresh absorption liquid comprises 8 wt% of sulfamic acid, 4wt% of organic acid activator sodium dodecyl benzene sulfonate and 88 wt% of water. Simultaneously adding 1.5 wt% of corrosion inhibitor and 1.5 wt% of defoaming agent relative to the fresh absorption liquid, and controlling the pH value to be 6.5. After the waste gas purification system, the content of methanol, the content of ammonia, the content of nitrophenol and the content of ether in the tail gas are respectively 0ppm and 10ppm, and the methanol, the ammonia and the like discharged by the waste gas all accord with the tail gas discharge standard. Simultaneously trapping NH in waste gas3And CH3The temperature of the circulating liquid after OH is controlled at 30 ℃ (NH) through a heat exchanger3The content is 0.1 percent, the content of methanol is 0.75 percent, and the content of nitrophenol is 0.05 percent), and part of tower bottom liquid after pollution catching is conveyed to a water treatment process, which meets the acceptance requirement of the wastewater treatment process, and the waste gas taste of coal slurry wastewater cannot be smelled in the field environment.
Example 2
As shown in fig. 1, the waste gas purifying tower 1 of the present embodiment includes a tower body, an air inlet 2 is disposed at the bottom of the tower body, an air outlet 3 and a wire mesh demister 4 are disposed at the top of the tower body, a fresh absorption liquid inlet 5, and a groove distributor 18. Two filler supporting screen plates 6 are arranged in the tower body, and fillers are placed on the filler supporting screen plates 6 to form a filler layer; and a high-efficiency conical nozzle (circulating liquid nozzle) 8 is arranged between the packing layers, and the conical nozzle 8 is connected with the tower bottom liquid through an acid-alkali resistant pipeline 9 and a circulating water pump 12 (the packing is not drawn in the figure).
The waste gas purification tower is provided with a centrifugal negative pumping machine 11, frequency conversion is adjusted, and energy conservation is realized while the negative pumping effect is ensured. A circulating water pump 12 and a waste water outward-feeding pump 13 are provided. Meanwhile, a circulating water heat exchanger 14 is arranged to ensure the absorption effect of the circulating absorption liquid.
The tower body 1 is provided with a first discharge port 15, a second discharge port 16 and a detection port 17.
The filler is terazor filler.
The angle alpha in fig. 3 is the contraction angle of the conical nozzle, the compressed air is arranged at the periphery of the nozzle and is entrained into the liquid phase along the outer wall of the nozzle, and the liquid flow has high spraying speed and good atomization effect.
Referring to fig. 1 and 2, the coal slurrying waste gas purification system discharges the coal slurrying waste gas to the outside after sequentially passing through a centrifugal negative extractor 11, an air inlet 2, a packing layer 6, a wire mesh demister 4 and an air outlet 3 arranged at the top along the air flow direction. Along the liquid flow direction, after passing through a fresh absorption liquid inlet 5, a groove type distributor 18, a packing layer 6, a gas-liquid flow uniform distribution 7 and a second discharge port 16, part of the fresh absorption liquid passes through a circulating water pump 12, a circulating water heat exchanger 14, an acid-base resistant pipeline 9 and a circulating liquid nozzle 8 and then enters the tower body 1 again, and part of tower bottom liquid is conveyed to a wastewater treatment process through a wastewater conveying pump 13.
20000Nm3The exhaust gas of the coal pulping system contains 140ppm NH3、150ppmCH3OH, 20ppm nitrophenol, 15ppm CHs3COCH3Wherein the included angle between the central line of the drainage rods and the central line of the waste gas inlet channel in the gas-liquid flow uniform distribution device is 80 degrees, the ratio of the area sum of gaps between the drainage rods to the cross sectional area of the corresponding position of the absorption tower cylinder is 40 percent, the inverted Y-shaped vertex angle of the backflow rod is 55 degrees, and the height of the flow guide rod from the inverted Y-shaped vertex angle to the bottom is 200 mm. The nozzle in the tower is a high-efficiency conical nozzle, and the contraction angle of the nozzle is 60 degrees. The fresh absorption liquid consists of 4wt% of sulfamic acid, 2 wt% of organic acid active agent rhamnose and 94wt% of water. Simultaneously adding 0.5 wt% of corrosion inhibitor and 0.5 wt% of defoaming agent relative to the fresh absorption liquid, and controlling the pH value to be 6.8. ThroughAfter the exhaust gas purification system, the methanol content in the tail gas was 60ppm, the ammonia content was 50ppm, the nitrophenol content was 10ppm, and the ether content was 5 ppm. Simultaneously trapping NH in waste gas3And CH3The temperature of the circulating liquid after OH is controlled at 40 ℃ (NH) through a heat exchanger3Content 0.5%, methanol content 1.0%).
The above description includes the preferred embodiments of the present invention, and is not intended to limit the present invention, and it should be noted that, for those skilled in the art, it is possible to make several modifications and variations without departing from the technical principle of the present invention, and these modifications and variations should be regarded as the protection scope of the present invention.
Claims (15)
1. A process for purifying exhaust gas of a coal slurrying system using an exhaust gas purifying apparatus, the process comprising:
(A) the waste gas is collected by a centrifugal suction machine, then passes through an air inlet of a waste gas purification tower, a gas-liquid flow distributor and a filler layer arranged in a filler support screen plate, and is in full gas-liquid contact with circulating liquid sprayed from a circulating liquid nozzle and absorption liquid distributed from a water distributor in sequence, and the purified waste gas is absorbed and discharged to the atmosphere;
(B) part of tower bottom liquid after absorbing the pollutants passes through a circulating liquid pump, a circulating liquid heat exchanger and a pipeline and then is sprayed into the tower body again through a circulating liquid nozzle;
(C) part of tower bottom liquid is conveyed to a waste liquid treatment system through a waste liquid conveying pump;
the waste gas purification device comprises a waste gas purification tower, a centrifugal negative pumping machine, a circulating water pump, a waste water outward-feeding pump and a circulating water heat exchanger, wherein the waste gas purification tower is provided with an air inlet, an air outlet, a fresh absorption liquid inlet, a first discharge port and a second discharge port,
wherein the centrifugal suction negative machine is connected with an air inlet of the waste gas purification tower, a first discharge port of the waste gas purification tower is connected with an inlet of a circulating water heat exchanger through a circulating water pump, an outlet of the circulating water heat exchanger returns to the inside of a tower body of the waste gas purification tower through a pipeline, a second discharge port of the waste gas purification tower is connected with a waste water treatment system through a waste water outward-feeding pump,
the waste gas purification tower comprises a tower body, the lower part of the tower body is provided with an air inlet and a first discharge port, the top of the tower body is provided with an air outlet, the bottom of the tower body is provided with a second discharge port,
the inside of the tower body comprises a fresh absorption liquid absorption section positioned at the upper part of the tower body and a circulating liquid absorption section positioned at the middle part or the lower part of the tower body, a silk screen wiper is arranged above the fresh absorption liquid absorption section, and the fresh absorption liquid absorption section is provided with a water distributor communicated with a fresh absorption liquid inlet and one or more filler support screen plates filled with fillers;
the circulating liquid absorption section is provided with a gas-liquid flow uniform distribution device,
a circulating liquid nozzle is arranged between the fresh absorption liquid absorption section and the circulating liquid absorption section and is connected with the outlet of the circulating water heat exchanger through a pipeline;
the absorption liquid contains 1-10 wt% of sulfamic acid, 1-5 wt% of organic acid active agent and 85-95 wt% of water, so that ammonia gas, methanol, nitrophenol and diethyl ether in the waste gas are removed simultaneously.
2. The coal-to-slurry system exhaust gas purification process of claim 1, wherein the water distributor is a trough distributor and the top packing layer is random packing.
3. The coal-to-slurry system exhaust gas purification process of claim 2, wherein the top filler is a terabasis filler.
4. The coal-to-slurry system exhaust gas purification process of claim 1, wherein a plurality of gas-liquid flow equipartition devices are arranged between the circulating liquid nozzle and the exhaust gas inlet in the circulating absorption section, each gas-liquid flow equipartition device comprises a plurality of drainage rods horizontally arranged at intervals, and the cross sections of the drainage rods are of inverted-Y-shaped structures.
5. The coal-to-liquid system exhaust gas purification process as claimed in claim 4, wherein an included angle between a gas-liquid flow distribution flow guide rod and a central line of the exhaust gas inlet channel is 90 ± 5 degrees, and the arrangement of the gas-liquid flow distribution flow guide rod from one side close to the exhaust gas inlet channel to one side far away from the exhaust gas inlet channel is changed from dense to sparse; and/or
The ratio of the sum of the areas of gaps among the drainage rods of the gas-liquid flow uniform distribution device to the cross-sectional area of the corresponding position of the absorption tower cylinder is 45-75%; and/or
The inverted Y-shaped vertex angle of the drainage rod is 35-75 degrees, and the height from the inverted Y-shaped vertex angle to the bottom of the drainage rod is 200-400 mm.
6. The exhaust gas purification process of the coal-to-liquid system as claimed in claim 5, wherein the ratio of the sum of the areas of the gaps between the flow guide rods of the gas-liquid flow uniform distribution device to the cross-sectional area of the corresponding position of the absorption tower cylinder is 50-60%.
7. The exhaust gas purification process of the coal-to-liquid system according to claim 5 or 6, wherein the inverted Y-shaped vertex angle of the drainage rod is 45-65 degrees, and the height of the drainage rod from the inverted Y-shaped vertex angle to the bottom is 250-350 mm.
8. The exhaust gas purification process of a coal-to-slurry system according to claim 1, wherein the content of sulfamic acid is 4 to 6wt%, the content of organic acid active agent is 2 to 4wt%, and the content of water is 90 to 94 wt%.
9. The coal-to-slurry system exhaust gas purification process of claim 1, wherein the organic acid active agent is one or more of sodium dodecyl benzene sulfonate, rhamnose, and saponin.
10. The exhaust gas purification process of a coal-to-slurry system according to any one of claims 1, 8 and 9, wherein the total acid concentration in the absorption liquid is 1 to 15 wt%; and/or
The pH value of the absorption liquid is controlled between 6 and 8.
11. An absorption liquid for absorbing waste gas of a coal pulping system comprises 1-10 wt% of sulfamic acid, 1-5 wt% of organic acid active agent and 85-95 wt% of water, so that ammonia gas, methanol, nitrophenol and diethyl ether in the waste gas are removed simultaneously.
12. The absorption liquid according to claim 11, wherein the content of sulfamic acid is 4 to 6wt%, the content of organic acid activator is 2 to 4wt%, and the content of water is 90 to 94 wt%.
13. The absorption liquid according to claim 11, further comprising a corrosion inhibitor in a concentration range of 0.01 to 2.5wt%, an antifoaming agent in a concentration range of 0.01 to 2.5 wt%.
14. The absorbent solution according to claim 13, wherein the corrosion inhibitor is selected from one or more of benzotriazole, phosphonic acid, silicate, polyphosphate, chromate, and the antifoaming agent is selected from one or more of tributyl phosphate, dimethicone, and polyoxyethylene oxypropylene glycerin.
15. The absorption liquid according to any one of claims 11 to 14, wherein the organic acid active agent is one or more of sodium dodecylbenzenesulfonate, rhamnose and saponin.
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| CN101838558A (en) * | 2010-06-13 | 2010-09-22 | 上海交通大学 | Mixed fuel coal water slurry entrained flow bed gasification system |
| CN104307313A (en) * | 2014-11-03 | 2015-01-28 | 苏州克利亚环保科技有限公司 | Multistage exhaust gas washing tower |
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