CN202237732U - Isobaric ammonia recovering device - Google Patents
Isobaric ammonia recovering device Download PDFInfo
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- CN202237732U CN202237732U CN2011203802523U CN201120380252U CN202237732U CN 202237732 U CN202237732 U CN 202237732U CN 2011203802523 U CN2011203802523 U CN 2011203802523U CN 201120380252 U CN201120380252 U CN 201120380252U CN 202237732 U CN202237732 U CN 202237732U
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Abstract
The utility model relates to ammonia recovering equipment in a synthetic ammonia plant, namely a purge gas isobaric ammonia recovering device in a synthetic ammonia plant. The isobaric ammonia recovering device consists of a lower bubbling absorber and an upper filler washer which are connected by a flange at the bottom of the filler washer and a flange on the top of the bubbling absorber; the lower part of the bubbling absorber is provided with a purge gas inlet and an ammonia water outlet; and the gas outlet of the filler washer is connected with a water separator, and the water inlet of the filler washer is connected with a desalting water pump. The cooling areas of an ammonia water cooler outside a tower and each cooler on a tower plate of each layer are gradually reduced from bottom to top, the characteristic of absorbing ammonia is realized, and the ammonia absorbing effect is improved; and because a desalting water cooler is arranged in front or in back of the desalting water pump, the temperature of the desalted water is reduced, and the temperature of dilute ammonia water in the filler washer is reduced. The concentration of the ammonia water at the outlet of the isobaric ammonia recovering device can be improved to about 45 percent.
Description
Technical field
The utility model relates to a kind of ammonia reclaimer of synthesis ammonia plant, i.e. the isobaric ammonia recovery unit of synthesis ammonia plant off-gas.
Background technology
In prior art; Isobaric ammonia recovery tower has multiple version: one section circulation absorbs the isobaric ammonia recovery tower outlet ammonia content height of ammonia, and generally more than 1% (volume), the ammonia concn of preparation is low; Generally below 12% (weight), belong to the ammonia reclaimer that falls behind, is eliminated.
The more quite a lot of isobaric ammonia recovery tower of ammonia recovering effect adopts not circulate and absorbs the technology of ammonia; The hop count and the number of plates that absorb ammonia are also higher relatively; The ammonia concn of preparation generally about 18% (weight), though ammonia concn is higher than backward isobaric ammonia recovery tower, the concentration of 45% (weight) high concentration ammoniacal liquor that also will reach far below the utility model; Ammoniacal liquor also will go to the desorption system of urea and depth hydrolysis system to distill, carry dense; Could reclaim afterwards, utilize, also will consume a large amount of low-pressure steams and high steam, also will consume.Ammonia content is relatively low in the isobaric ammonia recovery tower outlet tail gas, generally about 0.2% (volume), reclaims the hydrogen in the tail gas; Also to tail gas be removed ammonia-cleaning tower once more, absorb in the tail gas remaining ammonia once more, weak aqua ammonia more than the delivery ratio ammoniacal liquor with more soft water or demineralized water; And weak aqua ammonia is difficult to handle; Also will with weak aqua ammonia send urea the distillation of desorption system and depth hydrolysis system, carry densely, equally also to consume low-pressure steam and high steam, also to consume.
The bottom cylindrical shell of the isobaric ammonia recovery tower that the ammonia recovering effect is well more a little is thick, and diameter is at φ 1600～φ 1800, and the bottom cylindrical shell is equipped with several bigger cooling water tanks, uses water quench ammoniacal liquor; The top barrel diameter is slightly thin, and diameter is also at φ 1000～φ 1400, and the top cylindrical shell is equipped with 8 layers to 18 layers column plate, and the performance of the absorption ammonia of isobaric ammonia recovery tower is not high.The top cylindrical shell that φ about 1000 is thinner; On the column plate of middle part and bottom, serpentine (trombone) cooler is installed, top is the column plate of no cooler, φ about 1400 thicker top cylindrical shells; Several little cooling water tanks are respectively arranged on the column plate of middle part and bottom, and top is the column plate of no cooler; The adiabatic clean ammonia effect that absorbs ammonia is mainly played on the top of top cylindrical shell, and not only barrel diameter is thick, and under same clean ammonia effect, the cylindrical shell height is also high, has increased weight of equipment and cost, and clean ammonia is not thorough; Each water tank, little water tank, serpentine (trombone) cooler are all used the water quench weak aqua ammonia.Because the tower diameter of top cylindrical shell is thick, under the operating pressure of 1.5MPa or 2.1MPa, the off-gas flow velocity that flow is very low is extremely low, and the flow velocity of ammoniacal liquor is also very low, and off-gas in the tower and ammoniacal liquor is bias current easily all, and influence absorbs the effect of ammonia.No matter be serpentine (trombone) cooler, still little cooling water tank can't be arranged bigger film-cooled heat in the lower very limited ammoniacal liquor bubbling absorption height between column plate, also be difficult to adjust flexibly or change the film-cooled heat of cooler on each column plate; The total film-cooled heat of one section cooling water tank is big at the bottom of the tower; And the film-cooled heat on each layer of the cylindrical shell column plate of top is very little; The total film-cooled heat of one section cooling water tank is about 10 times of film-cooled heat on each individual layer column plate of top cylindrical shell at the bottom of the tower, and one section film-cooled heat with top adjacent tray differs very big at the bottom of the tower, and the film-cooled heat of top each layer of cylindrical shell column plate is all identical; Can't the cooler area distributions on each layer column plate be become from top to bottom increases gradually; It is unreasonable that each layer column plate film-cooled heat distributes, and the film-cooled heat of some column plate is not enough, is unfavorable for bringing into play the effect of these column plates; The effect of ammonia is reclaimed in influence, and also influence improves the concentration and the ammonia content that reduces tail gas of ammoniacal liquor.
Employing cooling water tank or little cooling water tank have increased the diameter of equipment barrel artificially, have increased the wall thickness of cylindrical shell; The cooling water tank wide-bore is installed on cylindrical shell is wanted reinforcement, cylindrical shell generally also will be thickeied, and has increased weight of equipment; The epimere of isobaric ammonia recovery tower adopts tower plate structure to wash ammonia, clean ammonia, and it is too thick that barrel diameter seems, some waste material has increased weight of equipment, has also increased equipment manufacturing cost; The part that cooling water tank and little cooling water tank stretch out cylindrical shell is the cooling dead angle basically, has wasted film-cooled heat, has consumed material more.More than these have all increased weight of equipment and cost;
Preparation 45% (weight) high concentration ammoniacal liquor, and will export the tail gas ammonia content and drop to below 0.002% (volume), need tens of numbers of plates of increase; If isobaric ammonia recovery tower all adopts tower plate structure to absorb ammonia; The height of cylindrical shell can be very high, and equipment can be heavier, and cost will be higher also.
In prior art, not enough below isobaric ammonia recovery tower exists:
1, the ammonia concn of isobaric ammonia recovery tower recovery is not high, and ammoniacal liquor will send desorption system and depth hydrolysis's system handles of urea, has consumed a large amount of low-pressure steams and high steam, also will consume;
2, the ammonia content in the isobaric ammonia recovery tower outlet tail gas is high relatively, reclaims the hydrogen in the tail gas, also will remove the clean ammonia of ammonia-cleaning tower, produce weak aqua ammonia, weak aqua ammonia send desorption system and the depth hydrolysis system of urea also to consume steam and;
3, the cooling water tank that stretches out cylindrical shell is the cooling dead angle, and the utilization rate of film-cooled heat is low;
4, because the tower diameter of top cylindrical shell is thick, off-gas in the tower and ammoniacal liquor is bias current easily all, and influence absorbs the effect of ammonia.
5, between column plate in the lower very limited height, the serpentine (trombone) cooler that can arrange or the film-cooled heat of little cooling water tank are little, and also can't the cooler on each layer column plate being distributed into from top to bottom, film-cooled heat increases gradually;
6, adopt serpentine (trombone) cooler or little cooling water tank in the cylindrical shell of top, artificially overstriking cylindrical shell, increased weight of equipment and cost;
What 7, installed on the top in the cylindrical shell of top is the column plate of no cooler, mainly plays the adiabatic clean ammonia effect that absorbs ammonia, and not only barrel diameter is thick, and under same clean ammonia effect, the cylindrical shell height is high, and clean ammonia is not thorough;
8, the total film-cooled heat of one section cooling water tank is big at the bottom of the tower; And the film-cooled heat on each layer of the cylindrical shell column plate of top is very little, and the film-cooled heat of one section top tray that is adjacent differs very great disparity at the bottom of the tower, and the film-cooled heat of top each layer column plate is all identical again; It is unreasonable that each layer column plate film-cooled heat distributes; Do not meet the characteristics that absorb ammonia, the film-cooled heat of some column plate is not enough, is unfavorable for bringing into play the effect of these column plates;
9, only one section absorption ammonia of weak effect, 8 layers to the 18 layers column plate that effect is quite a lot of, the number of plates is few, and the performance that absorbs ammonia is not high, so the ammonia concn of preparation is low, ammonia content is high in the tail gas;
10, the quite a lot of isobaric ammonia recovery tower of effect all adopts tower plate structure, adopts cooling water tank or serpentine (trombone) cooler, and device diameters is thick, the wall thickness of cylindrical shell, and equipment is heavy, and cost is high;
11, preparation 45% (weight) high concentration ammoniacal liquor, and will export the tail gas ammonia content and drop to below 0.002% (volume), if all adopt tower plate structure absorption ammonia, the height of cylindrical shell can be very high, and equipment can be very heavy, and cost also can be higher, and is promptly unreasonable, also uneconomical.
The utility model content
The purpose of the utility model is that a kind of ammonia concn that provides to above-mentioned deficiency is very high, the tail gas ammonia content is extremely low, the better isobaric ammonia recovery unit of ammonia recovering effect.
The technical solution of the utility model is: a kind of isobaric ammonia recovery unit is made up of the bubbling absorber of bottom and the padding washing device on top, between be connected with the flange of padding washing device bottom and the flange of bubbling absorber overhead; Off-gas inlet and ammoniacal liquor outlet are arranged at bubbling absorber bottom; Padding washing device gas vent is connected with separator, and the water inlet of padding washing device is connected with the desalination water pump.
Be connected with circulation absorption and separation device at the off-gas of bubbling absorber inlet, the ammoniacal liquor outlet of bubbling absorber also is connected with circulation absorption and separation device, circulation absorption and separation device and with tower outward the ammoniacal liquor cooler be connected with absorption, the cool cycles pipeline of high concentration ammoniacal liquor.High concentration ammoniacal liquor circulates between the ammoniacal liquor cooler outside circulation absorption and separation device and tower.
On the import or export pipeline of desalination water pump, increase the demineralized water cooler is arranged.
The bubbling absorber comprises cylindrical shell, and the top of cylindrical shell has adpting flange to be connected with the flange of padding washing device bottom, and concentrated ammonia liquor outlet and off-gas inlet are arranged below; Be provided with one or more layers bubbling column plate in the cylindrical shell from top to bottom, on the bubbling column plate coiled pipe cooler be installed; The bottom of cylindrical shell or below one or more layers of tower dividing plate on the round trip intercooler is installed; Each coiled pipe cooler and each round trip intercooler and below bubbling column plate and tower dividing plate between tubular gas distributor and multitube gas distributor are installed; No tower dividing plate below the round trip intercooler that install the bottom of cylindrical shell.
On the bubbling column plate below coiled pipe cooler and between the cylindrical shell down-flow plate is installed; The centre of bubbling column plate is equipped with riser and outer tube, and the bottom of outer tube is connected with the tubular gas distributor, and the coil pipe on coiled pipe cooler upper strata and the upper orifice of riser and down-flow plate top margin basic are flat; The centre of bubbling column plate bottom is provided with baffling demister and discharge opeing liquid sealing pipe, can increase or reduce the film-cooled heat of each coiled pipe cooler neatly through increasing or reduce the radical of coil pipe.
Round trip intercooler feed tube and drain pipe stretch out, are welded in the both sides of cylindrical shell respectively; Nos riser and down-flow plate on the tower dividing plate between the round trip intercooler up and down, the ammoniacal liquor outlet above the tower dividing plate is connected outside cylindrical shell with following ammoniacal liquor import, and following off-gas exports the inlet of tubular gas distributor on the external tower dividing plate of cylindrical shell.Can increase or reduce the film-cooled heat of round trip intercooler flexibly through changing the length and the radical of heat exchanger tube.
The padding washing device comprises the cylindrical shell of band gas vent and water inlet, and the cylindrical shell flange in the bottom is connected with the flange of bubbling absorber overhead; The cylindrical shell internal upper part has liquid distribution trough, is the packing layer that structured packing is housed more than a section or a section below the liquid distribution trough; Between two sections packing layers of first section packing layer and second section packing layer, can be provided with liquid re-distributor.
Circulation absorption and separation device comprises cylindrical shell; Be provided with gas vent, liquid distribution trough, packing layer, concentrated ammonia liquor import on the top of cylindrical shell, the middle part has porous plate, trunnion, collapsible tube, bottom that high strength ammonia water inlet, nozzle, the air jet pipe that has the hole, high strength ammonia water out, off-gas import, high concentration ammoniacal liquor outlet are arranged; Concentrated ammonia liquor import, gas vent are connected with the concentrated ammonia liquor outlet of bubbling absorber bottom and the off-gas inlet of bottom respectively; High strength ammonia water out, high strength ammonia water inlet are connected with the high strength ammonia water entrance of the outer ammoniacal liquor cooler of the tower that increases newly respectively; Under the situation that does not need external power, the circulation that high concentration ammoniacal liquor absorbs automatically, cools off, absorbs between the ammoniacal liquor cooler outside circulation absorption and separation device and tower; In circulation absorption and separation device, concentrated ammonia liquor, high strength ammonia water respectively with adverse current, and stream, three kinds of absorption patterns of cross-flow absorb the ammonia in the off-gas.
Coiled pipe cooler in the bubbling absorber; Comprise one or an above involute shape coil pipe; The import and export of its each coil pipe are connected with the outlet header with intake header respectively; Each coil pipe is fixed by some support fixation elements, and inlet tube, outlet are connected with the outlet header with intake header respectively, and intake header and outlet header are in the same side of tubular axis.
Round trip intercooler in the bubbling absorber is made up of last liquid-collecting box, following liquid-collecting box, many heat exchanger tubes, several gripper shoes, feed tube and drain pipes; The bigger gas-liquid channel of hexagon is left in center at last liquid-collecting box, following liquid-collecting box, and also leaves bigger annular gas-liquid channel between the cylindrical shell; In the liquid-collecting box dividing plate is arranged between feed tube, drain pipe.
Establish first feeder that has an outlet of weak aqua ammonia, second liquid distribution trough that has an inlet tube of weak aqua ammonia and the 3rd section packing layer below second section packing layer of padding washing device; And outside cylindrical shell, being provided with little ammoniacal liquor cooler outside first tower, the outer little ammoniacal liquor cooler of first tower is connected with pipeline with outlet of weak aqua ammonia of first feeder, inlet tube of weak aqua ammonia of second liquid distribution trough respectively;
Or below the 3rd section packing layer, establish second feeder that has weak aqua ammonia secondary outlet, the 3rd liquid distribution trough that has weak aqua ammonia secondary inlet tube and the 4th section packing layer; And outside cylindrical shell, be provided with little ammoniacal liquor cooler outside second tower, be connected with corresponding interface with pipeline equally;
Each round trip intercooler in outer ammoniacal liquor cooler of tower and the bubbling absorber, the film-cooled heat of each coiled pipe cooler reduce from bottom to top gradually.
Circulation absorption and separation device, the outer ammoniacal liquor cooler of tower, the outer little ammoniacal liquor cooler of first tower and the outer little ammoniacal liquor cooler of second tower, demineralized water cooler are the equipment that increases newly;
The outer ammoniacal liquor cooler of tower, the outer little ammoniacal liquor cooler of first tower and the outer little ammoniacal liquor cooler of second tower, desalination water pump, demineralized water cooler are chemical industry common structural forms.
Each cooler of isobaric ammonia recovery unit can serviceability temperature be low, pressure is high liquefied ammonia cooling high strength ammonia water, ammoniacal liquor, weak aqua ammonia and demineralized water.Described each cooler comprises: outer little ammoniacal liquor cooler of each round trip intercooler, each coiled pipe cooler, first tower in the outer ammoniacal liquor cooler of tower, the bubbling absorber and the outer little ammoniacal liquor cooler of second tower, demineralized water cooler.
Circulation absorption and separation device increased and the bubbling absorber bottom between intersegmental ammonia concn poor, further improved the concentration of discharging ammoniacal liquor mouth high concentration ammoniacal liquor, obtain than effect that column plate is not bad in the bubbling absorber.
Described bubbling absorber comprises cylindrical shell, and following concentrated ammonia liquor outlet is connected with gas vent with the concentrated ammonia liquor inlet of circulation absorption and separation device respectively with the off-gas inlet.Owing to do not adopt water tank cooling ammoniacal liquor, so overstriking barrel diameter artificially, barrel diameter is thinner, and barrel diameter is generally at φ 600～φ 1400, and bubbling absorber barrel diameter is lower than the isobaric preferably ammonia recovery tower of present ammonia recovering effect.The area of each cooler all from top to bottom increases gradually in the cylindrical shell.
Leave bigger hexagon gas-liquid channel in the following center of liquid-collecting box, and leave bigger annular gas-liquid channel between the cylindrical shell, help the gas that following multitube gas distributor rises and get into smoothly between pipe, and between pipe, distribute more even; Feed tube and drain pipe stretch out, are welded in the both sides of cylindrical shell respectively, so that tower dividing plate or bubbling column plate are installed above the round trip intercooler, and fixing round trip intercooler.
Nos riser and down-flow plate on the tower dividing plate between the round trip intercooler up and down, the ammoniacal liquor outlet above the tower dividing plate is connected outside cylindrical shell with following ammoniacal liquor import, and following off-gas exports the inlet of multitube gas distributor on the external tower dividing plate of cylindrical shell.
The low concentration region of residual ammonia in the padding washing device washing absorption tail gas on bubbling absorber top; Reduce in the water yield that absorbs ammonia under original 1/17th the very unfavorable conditions; Again the tail gas ammonia content is dropped to below 0.002% (volume) about by 0.5% (volume); It is very difficult that ammonia content descends more than 250 times again, and the theoretical cam curve about 60 need be arranged in the padding washing device.
Described padding washing device comprises cylindrical shell and since cylindrical shell in no serpentine (trombone) cooler, do not have little water tank yet, so barrel diameter is very thin, barrel diameter is generally at φ 200～φ 600.
Increase the demineralized water cooler before padding washing device water inlet or before the desalination water pump, reduce the demineralized water of adding padding washing device or the temperature of desorb waste water.
Each round trip intercooler in the outer ammoniacal liquor cooler of tower, the bubbling absorber, the film-cooled heat of each coiled pipe cooler from bottom to top reduce gradually.The film-cooled heat of each cooler; Be different by the heat of solution that constantly reduces gradually, emitted that absorbs the ammonia amount on its circulation absorption and separation device, each layer tower dividing plate, each layer bubbling column plate; Its cooling load is different and distribute; Meet the actual condition that absorbs ammonia, thereby brought into play the bubbling absorbability of circulation absorption and separation device better with each layer tower dividing plate, each layer bubbling column plate.
Have the tower dividing plate of cooler, the number of plies of bubbling column plate in increase hop count, the increase bubbling absorber, thereby can further improve the ability of height, middle concentration range absorption ammonia, further improve ammonia concn;
In the padding washing device, be provided with the packing layer that structured packing is housed more than a section or a section; Can the theoretical cam curve of filler in the padding washing device be brought up to 60 or more; Increased substantially the ability of washing ammonia, can realize ammonia content in the tail gas is dropped to extremely low;
Second section packing layer of padding washing device, the 3rd section outer little ammoniacal liquor cooler of first tower and the outer little ammoniacal liquor cooler cooling of second tower that the weak aqua ammonia that packing layer falls goes tower to increase newly respectively outward; Weak aqua ammonia returns next section packing layer afterwards; Reduced the temperature of padding washing device bottom weak aqua ammonia; Reduced the vapour pressure of weak aqua ammonia ammonia, the further absorbability that improves padding washing device bottom.
The structured packing total height of padding washing device is generally 3 meters to 12 meters, establishes 1 section to 4 sections packing layer in general.If padding washing device outlet tail gas not dehydrogenation gas reclaims, the index of outlet tail gas ammonia content can be relaxed, and the tail gas ammonia content can be higher than 0.002% (volume); At this moment; Can cancel the outer little ammoniacal liquor cooler of second tower, the 4th section packing layer of cancellation padding washing device maybe can be cancelled the outer little ammoniacal liquor cooler of first tower; The 3rd section packing layer of cancellation padding washing device; Can also reduce by first section packing layer of a little padding washing devices, the filler total height of second section packing layer, even the cancellation liquid re-distributor, two sections packing layers are combined into one section packing layer.
Second section at the padding washing device increases the 3rd, the 4th section packing layer below the packing layer; Increase the outer little ammoniacal liquor cooler of 2 towers; Not only reduce the temperature that absorbs weak aqua ammonia behind the ammonia, improved the absorbability of padding washing device bottom, can also reduce the height at the superiors' coiled pipe cooler place in the bubbling absorber; So that low-temperature liquid ammonia or cooling water can get into the coiled pipe cooler of the superiors; Also can reduce simultaneously the tower dividing plate that has cooler in the bubbling absorber, the number of plies of bubbling column plate, reduce the height of the thicker relatively bubbling absorber of diameter, reduce equipment manufacturing cost;
Increase the bubbling column plate which floor has the tower dividing plate of round trip intercooler or has coiled pipe cooler; Can cancel the outer ammoniacal liquor cooler of circulation absorption and separation device and tower; But increased the height of bubbling absorber; The coiled pipe cooler of topmost possibly advance not go low-temperature liquid ammonia or cooling water, has also increased the cost of equipment.
Whether below second section packing layer the 3rd section packing layer of increase, increase little ammoniacal liquor cooler outside first tower; Or increase the 4th section packing layer again; Increase the outer little ammoniacal liquor cooler of second tower again; Or do not increase circulation absorption and separation device and the outer ammoniacal liquor cooler of tower, and mainly be to depend on process conditions and requirement, secondly be the cost that depends on equipment.
Padding washing device barrel diameter is very thin, and generally between φ 200～φ 600, diameter is far below the ammonia recovering effect diameter phi 1000～φ 1400 of tower top cylindrical shell preferably; If the padding washing device of 60 polylith theoretical cam curves adopts tower plate structure; Need the column plate and the bubbling column plate of about 80 no cooler, not only diameter is thick, highly also can be very high; Equipment can be very heavy, and cost also can be very high.
The sum of the theoretical cam curve of the number of plates of bubbling absorber and padding washing device reaches about 66; 8 to 18 of the better tower of present ammonia recovering effect have been higher than far away; Not only can the tail gas ammonia content be dropped to below 0.0020% (volume), tail gas directly dehydrogenation gas reclaims, and no longer produces weak aqua ammonia; No longer consume steam and electric treatment weak aqua ammonia, and can prepare dense high concentration ammoniacal liquor; Can adopt my other new technology; Off-gas ammonia content before the isobaric ammonia recovery unit off-gas inlet is dropped to about 20% (volume); Use low-temperature liquid ammonia cooling ammoniacal liquor instead; Can ammonia concn be brought up to about 45% (weight) about by 15% present (weight), the high concentration ammoniacal liquor about 45% (weight) directly goes one of urea to inhale tower, together removes the urea synthesizer urea synthesis through a first pump with a first liquid; Isobaric ammonia reclaims desorption system and the depth hydrolysis system that ammoniacal liquor no longer removes urea, no longer consume steam and.
Isobaric ammonia recovery unit is equivalent to isobaric ammonia recovery tower and ammonia-cleaning tower are combined, by the clean ammonia of secondary, secondary add water, secondary is discharged (rare) ammoniacal liquor, change into once only ammonia, once add water, once discharge ammoniacal liquor, saved demineralized water, no longer discharge weak aqua ammonia.
But be not simply with isobaric ammonia recovery tower and ammonia-cleaning tower is combined, stack, if isobaric ammonia recovery tower and ammonia-cleaning tower are grouped together simply, understand interactional.The desalination water yield that ammonia-cleaning tower adds is bigger, so the temperature rise of weak aqua ammonia is little in the packing layer of ammonia-cleaning tower bottom, the desalination water yield that ammonia-cleaning tower adds is unrestricted, can strengthen the addition of demineralized water; But the desalination water yield that isobaric ammonia recovery unit adds is restricted, otherwise the ammonia concn of preparation is low; The desalination water yield that isobaric ammonia recovery unit adds is lacked than what ammonia-cleaning tower added, like this, can cause the temperature rise of weak aqua ammonia in the packing layer of padding washing device bottom to increase; Influence clean ammonia effect, especially before getting into isobaric ammonia recovery unit, the ammonia content of off-gas has dropped to about 20% (volume); It is original 1/4th that isobaric ammonia recovery unit demineralized water consumption reduces to, and further improved the concentration of ammoniacal liquor again, and the demineralized water consumption reduces again significantly; The demineralized water consumption has only original about 1/17th; Can cause the temperature rise of weak aqua ammonia in the packing layer of padding washing device bottom higher, outlet tail gas ammonia content raises, and does not reach clean ammonia index.
The utility model is through increasing the demineralized water cooler before or after the desalination water pump; Measure with low-temperature liquid ammonia cooling and desalting water; Solve the temperature rise problem of weak aqua ammonia in the packing layer of bottom,, reach the purpose that reduces weak aqua ammonia temperature in the packing layer through reducing the temperature of demineralized water; Through the weak aqua ammonia of packing layer bottom is collected, deliver to the padding washing device and cool off outward again, the weak aqua ammonia after the cooling returns distribution again, continues in packing layer, to absorb the measure of ammonia, further solves the problem of packing layer bottom weak aqua ammonia temperature rise again.
The padding washing device has not only replaced ammonia-cleaning tower; The column plate that has also replaced the no cooler on traditional isobaric ammonia recovery tower top absorbs ammonia has the column plate of cooler to absorb ammonia with part; But under same absorption ammonia effect, bubbling absorber cylindrical shell height is low, has reduced weight of equipment and cost.
The utility model has the advantages that:
1, the theoretical cam curve of the padding washing device on isobaric ammonia recovery tower top can provide very many theoretical cam curves more than 60 in not too high limited height, and this has brought into play important effect to reducing in the tail gas ammonia content significantly;
If the padding washing device of 2 60 polylith theoretical cam curves adopts tower plate structure, not only diameter is thick, highly also can be very high, and equipment can be very heavy, and cost also can be very high.
3, the film-cooled heat of each cooler on the outer ammoniacal liquor cooler of tower and each layer column plate; From bottom to top reduce gradually; The difference of the heat of solution that is each layer column plate absorbs the ammonia amount by it difference, is emitted; The cooler of cooler load is different and distribute on each layer column plate, meets the characteristics that absorb ammonia, has improved the effect of absorption ammonia;
4, increased the outer ammoniacal liquor cooler of circulation absorption and separation device and tower, improved the ability of area with high mercury absorption ammonia, it is poor to have strengthened intersegmental ammonia concn, has alleviated the load of isobaric ammonia recovery tower, thereby has improved whole assimilation effect;
5, the bubbling absorber adopts coiled pipe cooler and round trip intercooler, can arrange bigger film-cooled heat in the lower very limited height between the bubbling column plate and between the tower dividing plate, and can each cooler be adjusted to area and have nothing in common with each other.
6, before or after the desalination water pump, increase the demineralized water cooler, reduced the temperature of demineralized water, thereby reduced the temperature of weak aqua ammonia in the padding washing device.
7, can cool off ammoniacal liquor and demineralized water with low-temperature liquid ammonia, the temperature of high concentration ammoniacal liquor and demineralized water is dropped to about 5 ℃, absorb ammonia at low temperatures, further improve ammonia concn, reduce outlet tail gas ammonia content;
8, the weak aqua ammonia that goes out second, third section packing layer removes the outer little ammoniacal liquor cooler of 2 towers respectively, returns after the cooling and is distributed to the 3rd, the 4th section packing layer, has reduced the weak aqua ammonia temperature of padding washing device bottom, has improved the ability of padding washing device bottom absorption ammonia.
9, can the ammonia concn of isobaric ammonia recovery unit outlet be brought up to about 45% (weight);
10, bring up to about 45% (weight) at the ammonia concn of isobaric ammonia recovery tower outlet, under the unfavorable conditions of 4.3 times of amount of water minimizings, can ammonia content in the tail gas be dropped to below 0.002% (volume), ammonia recovery is up to 99.999%;
11, ammonia content drops to about 20% (volume) in the import off-gas; Ammonia concn is brought up to about 45% (weight); Under the very unfavorable conditions of 17 times of amount of water minimizings; If employing low temperature absorbs ammonia down, still can ammonia content in the tail gas be dropped to below 0.002% (volume), ammonia recovery is up to 99.992%;
12, the ammonia concn about 45% (weight) has met or exceeded the ammonia concentration of urea one first liquid; Ammonia vol is considerably less again; Amount of water has only the high concentration ammoniacal liquor about original about 1/17th, 45% (weight) can directly go one to inhale tower, and ammoniacal liquor no longer goes desorb and depth hydrolysis; Saved a large amount of steam and power consumption, isobaric ammonia has been reclaimed have a qualitative leap;
13, owing to ammonia content in the tail gas has dropped to below 0.002% (volume); Off-gas tail gas can directly go the pressure swing adsorption method recover hydrogen or go the doughnut membrane separation process to carry hydrogen; Free from environmental pollution; Can realize that ammonia and hydrogen in the off-gas all reclaim, thereby improve the overall efficiency that off-gas reclaims.
14, when system shutdown, the ammoniacal liquor on each layer column plate can not fall into down one deck column plate, can not cause the ammoniacal liquor of each layer column plate in the tower all to fall at the bottom of the tower, can not influence the driving after isobaric ammonia recovery system stops.
To combine accompanying drawing that the utility model is described in further detail below.
Description of drawings
Fig. 1 is the utility model process chart.
Fig. 2 is the bubbling absorber structure sketch of the utility model.
Fig. 3 is the padding washing device structure diagram of the utility model.
Fig. 4 is the circulation absorption and separation device structure diagram of the utility model.
The specific embodiment
Referring to Fig. 1, isobaric ammonia recovery unit is made up of equipment such as circulation absorption and separation device 1, the outer ammoniacal liquor cooler 2 of tower, isobaric ammonia recovery tower, separator 3, demineralized water cooler 4, desalination water pump 5, the outer little ammoniacal liquor cooler 6 of first tower and the outer little ammoniacal liquor coolers 7 of second tower; Isobaric ammonia recovery tower is made up of with padding washing device 9 two parts that top increases newly the bubbling absorber 8 of bottom, for the ease of transporting, between connect with flange;
8 off-gas import departments have increased circulation absorption and separation device 1 at the bubbling absorber, and the ammoniacal liquor pipeline of the outer ammoniacal liquor cooler 2 of tower is connected with circulation absorption and separation device 1, has formed absorption, the cooling circuit of high concentration ammoniacal liquor; The delivery port of desalination water pump 5 is connected with the water inlet on padding washing device 9 tops, and the demineralized water cooler 4 that increases newly is installed in before or after the desalination water pump 5; The tail gas outlet of padding washing device 9 is connected with separator 3; The weak aqua ammonia inlet of outer little ammoniacal liquor cooler 6 of first tower and the outer little ammoniacal liquor cooler 7 of second tower weak aqua ammonia below second section packing layer of padding washing device 9 bottoms, the 3rd section packing layer respectively exports and is connected; Afterwards, the weak aqua ammonia outlet of the outer little ammoniacal liquor cooler of each tower is connected with the 3rd section packing layer of padding washing device 9 bottoms, the 4th section weak aqua ammonia inlet above the packing layer respectively again.
Referring to Fig. 2, each liquefied ammonia that the cooler serviceability temperature is low, pressure is high cooling high strength ammonia water, ammoniacal liquor, weak aqua ammonia and the used water of absorption ammonia of isobaric ammonia recovery unit.Described each cooler comprises: the outer little ammoniacal liquor cooler of each the round trip intercooler 40 in the outer ammoniacal liquor cooler 1 of tower, the bubbling absorber, each coiled pipe cooler 39, the outer little ammoniacal liquor cooler 6 of first tower and second tower 7, demineralized water cooler 4.
Referring to Fig. 4; Circulation absorption and separation device 1 comprises cylindrical shell 71; Be provided with gas vent 70, liquid distribution trough 72, packing layer 73, concentrated ammonia liquor import 85 on the top of cylindrical shell 71; The middle part has porous plate 84, trunnion 83, collapsible tube 82, bottom that high strength ammonia water inlet 76, nozzle 81 are arranged, has the air jet pipe 77, high strength ammonia water out 80, off-gas import 78, high concentration ammoniacal liquor outlet 79 in hole etc., is provided with interface of the level gauge 74 and 75 at the middle part of cylindrical shell.Concentrated ammonia liquor import 85, gas vent 70 are connected with the off-gas import of bottom with the concentrated ammonia liquor outlet of bubbling absorber 8 bottoms respectively; High strength ammonia water out 80, high strength ammonia water inlet 76 are connected with the high strength ammonia water entrance of the outer ammoniacal liquor cooler 2 of the tower that increases newly respectively; Under the situation that does not need external power, the circulation that high concentration ammoniacal liquor absorbs automatically, cools off, absorbs between the ammoniacal liquor cooler 2 outside circulation absorption and separation device 1 and tower; In circulation absorption and separation device 1; Concentrated ammonia liquor, high strength ammonia water respectively with adverse current, and stream, three kinds of absorption patterns of cross-flow absorb the ammonia in the off-gas; Increased and bubbling absorber 8 bottoms between intersegmental ammonia concn poor; Further improved the concentration of discharging ammoniacal liquor mouth high concentration ammoniacal liquor, obtained than in the bubbling absorber 8 interior effects that column plate is not bad.
Referring to Fig. 2; Described bubbling absorber 8 comprises cylindrical shell 35; The top of cylindrical shell 35 has adpting flange 38 to be connected with the flange of padding washing device 9 bottoms, and the outlet 22 of following concentrated ammonia liquor and off-gas inlet 23 enter the mouth with the concentrated ammonia liquor of circulation absorption and separation device 9 respectively and 85 be connected with gas vent 70.Because do not adopt water tank cooling ammoniacal liquor, so need not add thick barrel 35 diameters artificially, cylindrical shell 35 diameters are thinner, cylindrical shell 35 diameters are generally at φ 600～φ 1400, and bubbling absorber barrel diameter is lower than the isobaric preferably ammonia recovery tower of present ammonia recovering effect.Be provided with one or more layers bubbling column plate 10 in the cylindrical shell 35 from top to bottom; Mounting disc chimney cooler 39 on bubbling column plate 10; Round trip intercooler 40 is installed on the bottom of cylindrical shell 35 or the following one or more layers of tower dividing plate 30; Each coiled pipe cooler 39 and each round trip intercooler 40 and below bubbling column plate 10 and tower dividing plate 30 between tubular gas distributor 12 and multitube gas distributor 29 are installed, no tower dividing plates 30 below the round trip intercooler 40 that install the bottom.The area of each cooler all from top to bottom increases gradually in the cylindrical shell 35.
Every group of coiled pipe cooler 39 comprises one or an above involute shape coil pipe 11; The import and export of its each coil pipe 11 are connected with outlet header 33 with intake header 32 respectively; Each coil pipe 11 is fixed by some support fixation elements; Inlet tube 31, outlet 34 are connected with outlet header 33 with intake header 32 respectively, intake header 32 and outlet header 33 the same side at cylindrical shell 35 axis; Below the coil pipe 11 tubular gas distributor 12, bubbling column plate 10; Be provided with down-flow plate 36 on the bubbling column plate 10 below coiled pipe cooler 39 and between the cylindrical shell 35; The centre of bubbling column plate 10 is equipped with riser 14 and outer tube 13, and the bottom of outer tube 13 is connected with tubular gas distributor 12, and the coil pipe 11 on coiled pipe cooler 39 upper stratas is flat with the upper orifice and down-flow plate 36 top margins basic of riser 14; The centre of bubbling column plate 10 bottoms is provided with baffling demister 15 and discharge opeing liquid sealing pipe 16.Can increase or reduce the film-cooled heat of each coiled pipe cooler 39 neatly through increasing or reduce the radical of coil pipe 11.
Every group of round trip intercooler 40 comprises liquid-collecting box 19, liquid-collecting box 24, heat exchanger tube 26, several gripper shoes 25, feed tube 18 and drain pipe 27 etc. that quantity is a lot of down; At last liquid-collecting box 19, the bigger gas-liquid channel of hexagon 21 is left in the center of liquid-collecting box 24 down, and also leave bigger annular gas-liquid channel between the cylindrical shell 35; Leave bigger hexagon gas-liquid channel in the following center of liquid-collecting box 24, and leave bigger annular gas-liquid channel between the cylindrical shell 35, help the gas that following multitube gas distributor 29 rises and get into smoothly between pipe, and between pipe, distribute more even; The gas that annular, circular gripper shoe 25 helps rising and the ammoniacal liquor of decline rise and descend at 25 baffling of gripper shoe, help gas-liquid and distribute, and augmentation of heat transfer reduces the gas flow resistance; The both sides that feed tube 18 and drain pipe 27 stretch out, are welded in cylindrical shell 35 respectively, so that tower dividing plate 30 or bubbling column plate 10 are installed above round trip intercooler 40, and fixing round trip intercooler 40; 19 dividing plate is arranged in the liquid-collecting box between feed tube 18, drain pipe 27, do not have tower dividing plate 30 below the round trip intercooler 40 that install the bottom.Can increase or reduce the film-cooled heat of round trip intercooler 40 flexibly through changing the length of heat exchanger tube 26.
Nos riser 14 and down-flow plate 36 on the tower dividing plate 30 between the round trip intercooler 40 up and down; Ammoniacal liquor outlet 17 above the tower dividing plate 30 is connected with following ammoniacal liquor import 20 outside cylindrical shell, and following off-gas outlet 28 is tubular gas distributor 29 inlets on the external tower dividing plate 30 of cylindrical shell.
The low concentration region of residual ammonia in the padding washing device 9 washing absorption tail gas on bubbling absorber 8 tops; Reduce in the water yield that absorbs ammonia under original 1/15th the very unfavorable conditions; Again the tail gas ammonia content is dropped to below 0.002% (volume) about by 0.5% (volume); It is very difficult that ammonia content descends more than 250 times again, and the theoretical cam curve about 60 need be arranged in padding washing device 9.
Referring to Fig. 3, described padding washing device 9 comprises the cylindrical shell 44 of band gas vent 40 and water inlet 58, and cylindrical shell 44 flange in the bottom 53 are connected with the flange 38 on bubbling absorber 8 tops.Owing to no serpentine (trombone) coolers in the cylindrical shell 44, also do not have little water tank, so cylindrical shell 44 diameters are very thin, cylindrical shell 44 diameters are generally at φ 200～φ 600.Cylindrical shell 44 internal upper parts have liquid distribution trough 42, are the packing layers more than a section or a section that structured packing is housed below the liquid distribution trough 42.Between two sections packing layers of first section packing layer 43 and second section packing layer 46, can be provided with liquid re-distributor 45; The effect of liquid re-distributor 45 is that the liquid that first section packing layer 43 gets off is distributed once more equably; Improve assimilation effect; Also can not establish liquid re-distributor 45, but assimilation effect is weaker;
Or below second section packing layer 46, establish and have second liquid distribution trough 48 and the 3rd section packing layer 49 that weak aqua ammonia once exports 57 first feeder 47, has an import 56 of weak aqua ammonia; And outside cylindrical shell 44, be provided with the outer little ammoniacal liquor cooler 6 of little ammoniacal liquor cooler 6, the first towers outside first tower and be connected with an import of the weak aqua ammonia 56 usefulness pipelines that the weak aqua ammonia of first feeder 47 once exports 57, second liquid distribution trough 48 respectively;
Or below the 3rd section packing layer 49, establish second feeder 50 that has weak aqua ammonia secondary outlet 55, the 3rd liquid distribution trough 51 and the 4th section packing layer 52 that has weak aqua ammonia secondary import 54; And outside cylindrical shell 44, be provided with little ammoniacal liquor cooler 7 outside second tower, be connected with corresponding interface with pipeline equally.
Increasing demineralized water cooler 4 before padding washing device 9 water inlets 58 or before the desalination water pump 5; Join the temperature of the demineralized water or the desorb waste water of padding washing device 9 through reduction; Reach the temperature that reduces weak aqua ammonia in the padding washing device 9, the purpose that reduces absorption temperature in the padding washing device 9, thereby further reduce ammonia content in the tail gas.
Have the tower dividing plate 30 of cooler, the number of plies of bubbling column plate 10 in the increase bubbling absorber 8, thereby can further improve the ability of height, middle concentration range absorption ammonia, further improve ammonia concn;
Each round trip intercooler 40 in the outer ammoniacal liquor cooler 2 of tower, the bubbling absorber 8, the film-cooled heat of each coiled pipe cooler 39 from bottom to top reduce gradually; The film-cooled heat of each cooler; Be different by the heat of solution that constantly reduces gradually, emitted that absorbs the ammonia amount on its circulation absorption and separation device 1, each layer tower dividing plate 30, each layer bubbling column plate 10; Round trip intercooler 40 on the outer ammoniacal liquor cooler 2 of tower, each layer tower dividing plate 30, each layer bubbling column plate 10, the cooling load of coiled pipe cooler 39 is different and distribute; Meet the characteristics that absorb ammonia; Thereby brought into play the absorbability of circulation absorption and separation device 1 better, improved the ability that high, middle concentration range absorbs ammonia, ensured that the ammonia concn of preparation is very high with each layer tower dividing plate 30, each layer bubbling column plate 10.
In padding washing device 9, be provided with the packing layer that structured packing is housed more than a section or a section; Can the theoretical cam curve of filler in the padding washing device 9 be brought up to 60 or more; Increased substantially the ability of washing ammonia, can realize ammonia content in the tail gas is dropped to extremely low;
Second section packing layer 46 of padding washing device 9, the 3rd section outer little ammoniacal liquor cooler 6 of first tower and outer little ammoniacal liquor cooler 7 coolings of second tower that the weak aqua ammonia that packing layer 49 falls goes tower to increase newly respectively outward; Weak aqua ammonia returns next section packing layer afterwards; Reduced the temperature of padding washing device 9 bottom weak aqua ammonias, the further absorbability that improves padding washing device 9 bottoms.
The structured packing total height of padding washing device 9 is generally 3 meters to 12 meters, establishes 1 section to 4 sections packing layer in general.If padding washing device 9 outlet tail gas not dehydrogenation gas reclaim, the index of outlet tail gas ammonia content can be relaxed, and the tail gas ammonia content can be higher than 0.002% (volume); At this moment; Can cancel the outer little ammoniacal liquor cooler 7 of second tower, the 4th section packing layer 52 of cancellation padding washing device 9 maybe can be cancelled the outer little ammoniacal liquor cooler 6 of first tower; The 3rd section packing layer 49 of cancellation padding washing device 9; Can also reduce by first section packing layer 43 of a little padding washing devices 9, the filler total height of second section packing layer 46, even cancellation liquid re-distributor 45, two sections packing layers are combined into one section packing layer.
Second section packing layer at the padding washing device increases the 3rd section packing layer 49, the 4th section packing layer 52 below 46; Increase the outer little ammoniacal liquor cooler 6 and 7 of 2 towers; Not only reduce the temperature that absorbs weak aqua ammonia behind the ammonia, improved the absorbability of padding washing device 9 bottoms, can also reduce the height at the superiors' coiled pipe coolers 39 places in the bubbling absorber 8; So that the low-temperature liquid ammonia of cooling can get into the coiled pipe cooler 39 of the superiors; Also can reduce simultaneously the tower dividing plate 30 that has cooler in the bubbling absorber 8, the number of plies of bubbling column plate 10, reduce the height of the thicker relatively bubbling absorber 8 of diameter, reduce equipment manufacturing cost;
Increase the bubbling column plate 10 which floor has the tower dividing plate 30 of round trip intercooler 40 or has coiled pipe cooler 39; Can cancel circulation absorption and separation device 1 and the outer ammoniacal liquor cooler 2 of tower; But increased the height of bubbling absorber 8; The coiled pipe cooler 39 of topmost possibly advance not go low-temperature liquid ammonia or cooling water, has also increased the cost of equipment.
Whether below second section packing layer 46 the 3rd section packing layer 49 of increase, increase little ammoniacal liquor cooler 6 outside first tower; Or increase the 4th section packing layer 52 again; Increase the outer little ammoniacal liquor cooler 7 of second tower again; Or do not increase circulation absorption and separation device 1 and the outer ammoniacal liquor cooler 2 of tower, and mainly be to depend on process conditions and requirement, secondly be the cost that depends on equipment.
Padding washing device 9 cylindrical shells 44 diameters are very thin; Generally between φ 200～φ 600, diameter is far below the ammonia recovering effect diameter phi 1000～φ 1400 of tower top cylindrical shell preferably, if the padding washing device of 60 polylith theoretical cam curves 9 adopts tower plate structures; Not only diameter is thick; Highly also can be very high, equipment can be very heavy, and cost also can be very high.
The sum of the theoretical cam curve of the number of plates of bubbling absorber 8 and padding washing device 9 reaches about 66; 8 to 18 of the better tower of present ammonia recovering effect have been higher than far away; Not only can the tail gas ammonia content be dropped to below 0.0020% (volume), tail gas directly dehydrogenation gas reclaims, and no longer produces weak aqua ammonia; No longer consume steam and electric treatment weak aqua ammonia, and can prepare dense high concentration ammoniacal liquor; Can adopt my other new technology; Off-gas ammonia content before the isobaric ammonia recovery unit off-gas inlet is dropped to about 20% (volume); Use low-temperature liquid ammonia cooling ammoniacal liquor instead; Can ammonia concn be brought up to about 45% (weight) about by 15% present (weight), the high concentration ammoniacal liquor about 45% (weight) directly goes one of urea to inhale tower, together removes the urea synthesizer urea synthesis through a first pump with a first liquid; Isobaric ammonia reclaims desorption system and the depth hydrolysis system that ammoniacal liquor no longer removes urea, no longer consume steam and.
Produce 200000 tons of synthesis ammonia plants per year for one, per hour produce 25.26 tons of ammonia, the no amino of per hour being discharged by the liquefied ammonia storage tank discharges tolerance at 880 mark rice
3About, if the ammonia content of liquefied ammonia storage tank outlet off-gas about 50% (volume), per hour takes about 667.86 kilograms of the ammonia of isobaric ammonia recovery system to from the liquefied ammonia storage tank; Take about 5289 tons of the ammonia of isobaric ammonia recovery system the whole year to, can prepare 35263 tons of the ammoniacal liquor of 15% (weight), if these ammoniacal liquor go desorb, depth hydrolysis; To consume 10578 tons of low pressure and high steams more, be worth 158.67 ten thousand yuan, the about 52890kwh of many power consumptions; 4.23 ten thousand yuan of the electricity charge, preparation ammoniacal liquor will consume 29973 tons of demineralized waters, is worth 11.99 ten thousand yuan; About 52.89 tons of the ammonia that minimizing is taken out of by isobaric ammonia recovery tower outlet tail gas; Be worth 17.98 ten thousand yuan, save recirculated water and the about 237600kwh of desalination water pump power consumption, 19.00 ten thousand yuan of the electricity charge.More than add up to save 211.87 ten thousand yuan altogether the whole year.
Claims (10)
1. isobaric ammonia recovery unit is characterized in that isobaric ammonia recovery unit is made up of the bubbling absorber (8) of bottom and the padding washing device (9) on top, between be connected with the flange of padding washing device (9) bottom and (8) flange of bubbling absorber overhead; Off-gas inlet (23) and ammoniacal liquor outlet (22) are arranged at bubbling absorber (8) bottom; Padding washing device (9) gas vent (40) is connected with separator (3), and the water inlet (58) of padding washing device (9) is connected with desalination water pump (5).
2. according to the described isobaric ammonia recovery unit of claim 1; It is characterized in that being connected with circulation absorption and separation device (1) at the off-gas inlet (23) of bubbling absorber (8); The ammoniacal liquor of bubbling absorber (8) outlet (22) also is connected with circulation absorption and separation device (1), circulation absorption and separation device (1) and with tower outward ammoniacal liquor cooler (2) be connected with absorption, the cool cycles pipeline of high concentration ammoniacal liquor.
3. according to the described isobaric ammonia recovery unit of claim 1, it is characterized in that increase has demineralized water cooler (4) on the import or export pipeline of desalination water pump (5).
4. according to the described isobaric ammonia recovery unit of claim 1; It is characterized in that bubbling absorber (8) comprises cylindrical shell (35); The top of cylindrical shell (35) has adpting flange (38) to be connected with the flange of padding washing device (9) bottom, and concentrated ammonia liquor outlet (22) and off-gas inlet (23) is arranged below; Be provided with one or more layers bubbling column plate (10) in the cylindrical shell (35) from top to bottom, coiled pipe cooler (39) is installed on the bubbling column plate (10); The bottom of cylindrical shell (35) or below one or more layers of tower dividing plate (30) on round trip intercooler (40) is installed; Each coiled pipe cooler (39) and each round trip intercooler (40) and below bubbling column plate (10) and tower dividing plate (30) between tubular gas distributor (12) and multitube gas distributor (29) are installed; No tower dividing plate (30) below the round trip intercooler (40) that install the bottom of cylindrical shell (35);
Bubbling column plate (10) below coiled pipe cooler (39) upward and between the cylindrical shell (35) is equipped with down-flow plate (36); The centre of bubbling column plate (10) is equipped with riser (14) and outer tube (13); The bottom of outer tube (13) is connected with tubular gas distributor (12), and the coil pipe (11) on coiled pipe cooler (39) upper strata is flat with the upper orifice of riser (14) and down-flow plate (36) top margin basic; The centre of bubbling column plate (10) bottom is provided with baffling demister (15) and discharge opeing liquid sealing pipe (16);
Round trip intercooler (40) feed tube (18) and drain pipe (27) stretch out, are welded in the both sides of cylindrical shell (35) respectively; Go up no riser (14) and down-flow plate (36) at the tower dividing plate (30) between the round trip intercooler (40) up and down; Ammoniacal liquor outlet (17) above the tower dividing plate (30) is connected outside cylindrical shell (35) with following ammoniacal liquor import (20), the inlet of following off-gas outlet (28) tubular gas distributor (29) on the external tower dividing plate of cylindrical shell (35) (30).
5. according to the described isobaric ammonia recovery unit of claim 1, it is characterized in that padding washing device (9) comprises the cylindrical shell (44) of band gas vent (40) and water inlet (58), cylindrical shell (44) flange in the bottom (53) is connected with the flange (38) at bubbling absorber (8) top; Cylindrical shell (44) internal upper part has liquid distribution trough (42), is the packing layer that structured packing is housed more than a section or a section below the liquid distribution trough (42); Between two sections packing layers of first section packing layer (43) and second section packing layer (46), can be provided with liquid re-distributor (45).
6. according to the described isobaric ammonia recovery unit of claim 2; The absorption and separation device (1) that it is characterized in that circulating comprises cylindrical shell (71); Be provided with gas vent (70), liquid distribution trough (72), packing layer (73), concentrated ammonia liquor import (85) on the top of cylindrical shell (71), the middle part has porous plate (84), trunnion (83), collapsible tube (82), bottom that high strength ammonia water inlet (76), nozzle (81) are arranged, has air jet pipe (77), high strength ammonia water out (80), off-gas import (78), the high concentration ammoniacal liquor outlet (79) in hole; Concentrated ammonia liquor import (85), gas vent (70) are connected with the concentrated ammonia liquor outlet (22) of bubbling absorber (8) bottom and the off-gas inlet (23) of bottom respectively; High strength ammonia water out (80), high strength ammonia water inlet (76) are connected with the high strength ammonia water entrance of the outer ammoniacal liquor cooler (2) of the tower that increases newly respectively.
7. according to the described isobaric ammonia recovery unit of claim 4; It is characterized in that the coiled pipe cooler (39) in the bubbling absorber (8); Comprise one or an above involute shape coil pipe (11); The import and export of its each coil pipe (11) are connected with outlet header (33) with intake header (32) respectively, and inlet tube (31), outlet (34) are connected with outlet header (33) with intake header (32) respectively, and intake header (32) and outlet header (33) are in the same side of cylindrical shell (35) axis.
8. according to the described isobaric ammonia recovery unit of claim 4, it is characterized in that the round trip intercooler (40) in the bubbling absorber (8) is made up of last liquid-collecting box (19), following liquid-collecting box (24), many heat exchanger tubes (26), several gripper shoes (25), feed tube (18) and drain pipe (27); The bigger gas-liquid channel of hexagon (21) is left in center at last liquid-collecting box (19), following liquid-collecting box (24), and also leaves bigger annular gas-liquid channel between the cylindrical shell (35); (19) have dividing plate in the last liquid-collecting box between feed tube (18), drain pipe (27).
9. according to the described isobaric ammonia recovery unit of claim 5; It is characterized in that (9) second sections packing layers of padding washing device (46) below establish first feeder (47) that has an outlet of weak aqua ammonia (57), second liquid distribution trough (48) that has an inlet tube of weak aqua ammonia (56) and the 3rd section packing layer (49); And outside cylindrical shell (44), being provided with little ammoniacal liquor cooler (6) outside first tower, the outer little ammoniacal liquor cooler (6) of first tower is connected with pipeline with an outlet of weak aqua ammonia (57) of first feeder (47), an inlet tube of weak aqua ammonia (56) of second liquid distribution trough (48) respectively;
Or below the 3rd section packing layer (49), establish second feeder (50) that has weak aqua ammonia secondary outlet (55), the 3rd liquid distribution trough (51) that has weak aqua ammonia secondary inlet tube (54) and the 4th section packing layer (52); And outside cylindrical shell (44), be provided with little ammoniacal liquor cooler (7) outside second tower, be connected with corresponding interface with pipeline equally.
10. according to claim 2 or 4 described isobaric ammonia recovery units, it is characterized in that each the round trip intercooler (40) in outer ammoniacal liquor cooler (2) of tower and the bubbling absorber (8), the film-cooled heat of each coiled pipe cooler (39) reduce from bottom to top gradually.
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| CN2011203802523U CN202237732U (en) | 2011-10-09 | 2011-10-09 | Isobaric ammonia recovering device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108097001A (en) * | 2018-01-11 | 2018-06-01 | 中石化南京工程有限公司 | A kind of system and method for ammonia in absorbing ammonia nitrogen mixed gas |
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| CN108097001A (en) * | 2018-01-11 | 2018-06-01 | 中石化南京工程有限公司 | A kind of system and method for ammonia in absorbing ammonia nitrogen mixed gas |
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