Ammonia-containing tail gas absorption tower and matched energy recovery system
Technical Field
The invention relates to the technical field of ammonia treatment equipment and peripheral supporting facilities thereof, in particular to an ammonia-containing tail gas absorption tower and a supporting energy recovery system.
Background
Ammonia is very soluble in water, and 1 volume of water can absorb 700 volumes of ammonia. Ammonia is a common raw material for industry, however, and is also a common tail gas pollution. The content of ammonia emission is regulated in the atmospheric emission standard, and the traditional technology has the principle of a gas washing tower, and the core of the traditional technology is that the ammonia absorption efficiency is increased by passing gas to be purified in the tower and then spraying water into the tower, spraying and atomizing, and simultaneously adding a filler and increasing the contact area of the gas and the water.
The traditional gas washing tower has the core working principle that water is sprayed into flowing gas, so that when the gas flows relatively at high speed, the mixed area of gas and water is relatively large, but due to the action of the relative force of water drops and air flowing, part of gas is not contacted with water all the time, the absorption space is large, the efficiency is low, and the traditional gas washing tower usually needs 3-4 stages of gas washing, so that the satisfactory emission condition can be achieved.
Therefore, how to change the current situation that the gas washing efficiency of the gas washing tower is low in the prior art becomes a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to provide an ammonia-containing tail gas absorption tower and a matched energy recovery system, so as to solve the problems in the prior art and improve the treatment and recovery efficiency of ammonia-containing tail gas.
The ammonia-containing tail gas absorption tower comprises a boiling ammonia tail gas recovery tower, a gas washing tower and a recovery assembly, wherein the boiling ammonia tail gas recovery tower is respectively communicated with the gas washing tower and the recovery assembly, the boiling ammonia tail gas recovery tower is provided with a first tail gas inlet, a first tail gas outlet and a first washing liquid outlet, the gas washing tower is provided with a second tail gas inlet, a second tail gas outlet and a second washing liquid outlet, the gas washing tower can be communicated with an external water source, the first tail gas outlet is communicated with the second tail gas inlet, the second washing liquid outlet is communicated with the boiling ammonia tail gas recovery tower, a boiling plate is arranged in the boiling ammonia tail gas recovery tower, the gas inlet is communicated with the gas outlet, the gas inlet is arranged towards the direction of the first tail gas inlet, the gas outlet is arranged towards the position where the second tail gas outlet is communicated with the boiling ammonia tail gas recovery tower, and the first tail gas outlet is communicated with the first tail gas outlet through the boiling plate.
Preferably, the first tail gas inlet is located at the bottom of the boiling ammonia tail gas recovery tower, the first tail gas outlet is located at the top of the boiling ammonia tail gas recovery tower, the air inlet is located at the bottom of the boiling plate, the air outlet is located at the top of the boiling plate, the second washing liquid outlet is communicated with the top of the boiling plate, and the second washing liquid outlet can drain washing liquid discharged from the gas washing tower to the top of the boiling plate.
Preferably, the air inlet is arranged at one end of the boiling plate, which is close to the axis of the boiling ammonia tail gas recovery tower, the other end of the boiling plate is connected with the inner wall of the boiling ammonia tail gas recovery tower, and the boiling plate is gradually arranged in a downward inclination manner from one end connected with the boiling ammonia tail gas recovery tower towards the free end of the boiling plate.
Preferably, the number of the boiling plates is multiple, the multiple boiling plates are uniformly distributed along the axis of the boiling ammonia tail gas recovery tower, and the adjacent boiling plates are staggered.
Preferably, the number of the air outlets is multiple, the air outlets are uniformly distributed, and the diameter of the air inlet is larger than that of the air outlet.
Preferably, the free end of the boiling plate is connected with a washing liquor recovery pipe, the washing liquor recovery pipe is communicated with the first washing liquor outlet, the recovery assembly comprises a heat exchanger, the first washing liquor outlet is communicated with the heat exchanger, and the heat exchanger is connected with a concentrated ammonia water recovery element.
Preferably, the gas washing tower comprises a spraying area, a filling area and a collecting area which are sequentially communicated from top to bottom, the spraying area is provided with a spray head, the spray head is communicated with an external water source, a second tail gas outlet is formed in the top of the spraying area and is communicated with an external environment, a gas disperser is arranged in the collecting area, the first tail gas outlet is communicated with the collecting area by the gas disperser, and a second washing liquid outlet is formed in the collecting area.
Preferably, the number of the spray heads is multiple, the spray heads are uniformly distributed along the axis direction of the gas washing tower, the axis of the spray heads is perpendicular to the axis of the gas washing tower, and a plurality of spray heads of each group are uniformly distributed around the axis of the gas washing tower in a circumferential manner.
Preferably, a transmission pump body is arranged between the second washing liquid outlet and the boiling ammonia tail gas recovery tower.
Compared with the prior art, the ammonia-containing tail gas absorption tower and the matched energy recovery system have the following technical effects that the ammonia-containing tail gas absorption tower comprises a boiling ammonia tail gas recovery tower, a gas washing tower and a recovery assembly, wherein the boiling ammonia tail gas recovery tower is respectively communicated with the gas washing tower and the recovery assembly, the boiling ammonia tail gas recovery tower is provided with a first tail gas inlet, a first tail gas outlet and a first washing liquid outlet, the gas washing tower is provided with a second tail gas inlet, the second tail gas outlet and the second washing liquid outlet, the gas washing tower can be communicated with an external water source, the first tail gas outlet is communicated with the second tail gas inlet, the second washing liquid outlet is communicated with the boiling ammonia tail gas recovery tower, a boiling plate is arranged in the boiling plate and is provided with an air inlet and an air outlet, the air inlet is communicated with the air inlet is arranged towards the direction of the first tail gas inlet, the air outlet is arranged towards the communicating position of the second washing liquid outlet and the boiling ammonia tail gas recovery tower, and the first tail gas inlet is communicated with the first tail gas outlet through the boiling plate. When the ammonia-containing tail gas absorption tower and the matched energy recovery system are in operation, ammonia-containing tail gas enters the boiling ammonia tail gas recovery tower from the first tail gas inlet, the ammonia-containing tail gas enters the boiling plate from the air inlet, the surface of the boiling plate meets a water film absorbing a small amount of ammonia to form a boiling effect, a large amount of ammonia is absorbed, the low-ammonia tail gas treated by the boiling ammonia tail gas recovery tower enters the scrubbing tower from the first tail gas outlet, an external water source is introduced into the scrubbing tower and is contacted with the tail gas entering the scrubbing tower, ammonia in the ammonia is absorbed, purified qualified tail gas is discharged from the second tail gas outlet, dilute ammonia washing liquid concentrated in the scrubbing tower is introduced into the boiling ammonia tail gas recovery tower, a water film is formed on the boiling plate, ammonia in the ammonia-containing tail gas is circularly absorbed, hot concentrated ammonia washing liquid absorbing ammonia and heat enters the recovery assembly from the boiling ammonia tail gas recovery tower through the first washing liquid outlet, and ammonia and heat are recovered. In the prior art, the gas washing equipment adopts a mode of spraying washing liquid to tail gas, gas can be avoided by the washing liquid in the spraying process, the gas washing effect is poor, and the multistage gas washing equipment is required to be arranged, so that the gas washing working efficiency is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an ammonia-containing tail gas absorber and associated energy recovery system of the present invention;
Wherein, 1 is boiling formula ammonia tail gas recovery tower, 2 is the gas washing tower, 3 is the recovery unit, 4 is first tail gas import, 5 is first tail gas export, 6 is first lotion export, 7 is second tail gas import, 8 is second tail gas export, 9 is second lotion export, 10 is boiling plate, 11 is lotion recovery tube, 12 is heat exchanger, 13 is spray zone, 14 is the filler zone, 15 is the collecting zone, 16 is the shower nozzle, 17 is the gas disperser, 18 is the transmission pump body, 19 is strong ammonia water recovery element, 20 is external water source.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide an ammonia-containing tail gas absorption tower and a matched energy recovery system, so as to solve the problems in the prior art and improve the treatment and recovery efficiency of ammonia-containing tail gas.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 1, fig. 1 is a schematic diagram of an ammonia-containing tail gas absorption tower and a matched energy recovery system according to the present invention.
The invention provides an ammonia-containing tail gas absorption tower and a matched energy recovery system, which comprise a boiling ammonia tail gas recovery tower 1, a gas washing tower 2 and a recovery component 3, wherein the boiling ammonia tail gas recovery tower 1 is respectively communicated with the gas washing tower 2 and the recovery component 3, the boiling ammonia tail gas recovery tower 1 is provided with a first tail gas inlet 4, a first tail gas outlet 5 and a first washing liquid outlet 6, the gas washing tower 2 is provided with a second tail gas inlet 7, a second tail gas outlet 8 and a second washing liquid outlet 9, the gas washing tower 2 can be communicated with an external water source 20, the first tail gas outlet 5 is communicated with the second tail gas inlet 7, the second washing liquid outlet 9 is communicated with the boiling ammonia tail gas recovery tower 1, a boiling plate 10 is arranged in the boiling ammonia tail gas recovery tower 1, the boiling plate 10 is provided with a gas inlet and a gas outlet, the gas inlet is arranged towards the direction of the first tail gas inlet 4, the gas outlet is arranged towards the position where the second washing liquid outlet 9 is communicated with the boiling ammonia tail gas recovery tower 1, and the first tail gas inlet 4 is communicated with the first outlet 5 through the boiling plate 10.
When the ammonia-containing tail gas absorption tower and the matched energy recovery system are in operation, ammonia-containing tail gas enters the boiling type ammonia tail gas recovery tower 1 through the first tail gas inlet 4, the ammonia-containing tail gas enters the boiling plate 10 through the air inlet, the surface of the boiling plate 10 is contacted with a water film absorbing a small amount of ammonia to form a boiling effect, a large amount of ammonia is absorbed, the low-ammonia tail gas treated by the boiling type ammonia tail gas recovery tower 1 enters the scrubbing tower 2 through the first tail gas outlet 5, an external water source 20 is introduced into the scrubbing tower 2 and is contacted with the tail gas entering the scrubbing tower 2, ammonia in the absorption of the ammonia is discharged through the second tail gas outlet 8, dilute ammonia washing liquid concentrated in the scrubbing tower 2 is introduced into the boiling type ammonia tail gas recovery tower 1, a water film is formed on the boiling plate 10, the ammonia in the ammonia-containing tail gas is circularly absorbed, the hot concentrated ammonia washing liquid absorbing ammonia and heat is introduced into the recovery assembly 3 through the first outlet 6, and ammonia and heat are recovered. In the prior art, the gas washing equipment adopts a mode of spraying washing liquid to tail gas, gas can be avoided by the washing liquid in the spraying process, the gas washing effect is poor, and the multistage gas washing equipment is required to be arranged, so that the gas washing working efficiency is reduced.
Wherein, first tail gas import 4 is located the bottom of boiling ammonia tail gas recovery tower 1, first tail gas export 5 is located the top of boiling ammonia tail gas recovery tower 1, the air inlet is located the bottom of boiling board 10, make things convenient for the ammonia gas tail gas to get into in the boiling board 10, second lotion export 9 is linked together with the top of boiling board 10, second lotion export 9 can be with the top of gas washing tower 2 exhaust lotion drainage to boiling board 10, the gas outlet is located the top of boiling board 10, the ammonia gas tail gas gets into in the water film at boiling board 10 top by the gas outlet, accomplish the gas washing, the phenomenon that the lotion "avoided" tail gas takes place.
Wherein, the air inlet sets up in the one end that boiling plate 10 is close to the axis of boiling ammonia tail gas recovery tower 1, and the other end of boiling plate 10 links to each other with the inner wall of boiling ammonia tail gas recovery tower 1, and boiling plate 10 is from the one end that links to each other with boiling ammonia tail gas recovery tower 1 towards the free end of boiling plate 10 slope setting gradually downwards, and the ammonia that conveniently gets into in the boiling plate 10 in the boiling ammonia tail gas recovery tower 1, and the water film at the boiling plate 10 top of being convenient for simultaneously flows into first lotion export 6 smoothly after absorbing ammonia.
In this embodiment, the quantity of boiling board 10 is the polylith to further improve boiling formula ammonia tail gas recovery tower 1's work efficiency, polylith boiling board 10 set up along boiling formula ammonia tail gas recovery tower 1's axis equipartition, improve ammonia treatment uniformity, in addition, improved boiling formula ammonia tail gas recovery tower 1's structural stability, adjacent boiling board 10 staggered arrangement of row strengthen ammonia treatment effect.
More specifically, the quantity of gas outlet is a plurality of, and a plurality of gas outlets equipartition sets up, has improved the degree of consistency in the water film that ammonia gas tail gas got into the lotion and formed, strengthens ammonia treatment effeciency, and in this embodiment, the diameter of air inlet is bigger than the diameter of gas outlet, ensures that ammonia gas tail gas gets into boiling plate 10 smoothly, and then gets into in the water film and wash gas.
In order to collect the concentrated hot ammonia washing liquid conveniently, the free end of the boiling plate 10 is connected with a washing liquid recovery pipe 11, the washing liquid recovery pipe 11 is communicated with the first washing liquid outlet 6, the recovery assembly 3 comprises a heat exchanger 12, the first washing liquid outlet 6 is communicated with the heat exchanger 12, the collected concentrated hot ammonia washing liquid exchanges heat with water or other heat carriers in the heat exchanger 12 for heating or other purposes in a factory, and the heat exchanger 12 is connected with a concentrated ammonia water recovery element 19 for waiting for cyclic production.
Further, the gas washing tower 2 comprises a spraying area 13, a filling area 14 and a collecting area 15 which are sequentially communicated from top to bottom, the spraying area 13 is provided with a spray head 16, the spray head 16 is communicated with an external water source 20, a second tail gas outlet 8 is formed in the top of the spraying area 13, the second tail gas outlet 8 is communicated with the external environment, the collecting area 15 is provided with a gas disperser 17, the first tail gas outlet 5 is communicated with the collecting area 15 by the gas disperser 17, and the second washing liquid outlet 9 is formed in the collecting area 15. The low-ammonia tail gas led out from the first tail gas outlet 5 enters the gas washing tower 2 through the second tail gas inlet 7, is uniformly dispersed into the gas washing tower 2 through the gas disperser 17, is guided to move to the upper part of the gas washing tower 2 by air pressure, clean water is pressurized and sprayed out from a nozzle at the top of the gas washing tower 2, a fog rain area is formed in the spraying area 13, water falls into the filling area 14 downwards, a water film is formed in the filling area 14, contacts with the low-ammonia tail gas from the collecting area 15, absorbs ammonia in the low-ammonia tail gas, the purified and qualified tail gas is discharged from the second tail gas outlet 8, and the unqualified gas is pressurized again and enters the gas washing process again.
In order to form uniform fog rain in the spraying area 13, the number of the spray heads 16 is multiple, the spray heads 16 of multiple groups are uniformly distributed along the axial direction of the gas washing tower 2, the axial line of the spray heads 16 is perpendicular to the axial line of the gas washing tower 2, and a plurality of spray heads 16 of each group are uniformly distributed around the axial line of the gas washing tower 2.
In addition, a transmission pump body 18 is arranged between the second washing liquid outlet 9 and the boiling ammonia tail gas recovery tower 1 to ensure smooth transmission of washing liquid, and similarly, the transmission pump body 18 is arranged between the first washing liquid outlet 6 and the heat exchanger 12, and between the external water source 20 and the gas washing tower 2 to ensure normal operation of the system.
When the ammonia-containing tail gas absorption tower and the matched energy recovery system are in operation, the ammonia-containing tail gas is pressurized from a pipeline at the lower part of the boiling ammonia tail gas recovery tower 1 to enter the boiling plate 10, meets a water film absorbing a small amount of ammonia on the surface of the boiling plate 10 to form a boiling effect, finishes the absorption of a large amount of ammonia gas, and outputs the low-ammonia tail gas subjected to primary absorption from a pipeline at the top of the boiling ammonia tail gas recovery tower 1; the low ammonia tail gas enters the lower part of the gas washing tower 2 through a bent pipe, is uniformly dispersed into the tower through a gas disperser 17, is guided to move to the upper part of the gas washing tower 2 by air pressure, the clean water is pressurized and sprayed out from a nozzle at the top of the gas washing tower 2, a fog rain area is formed in the top area, water falls down into a filler area 14, forms a water film on the filler, contacts with the low ammonia tail gas from the tower downwards, absorbs ammonia in the low ammonia tail gas, the purified and qualified tail gas is discharged from the top of the tower through a detector and a buffer, the reject gas is pressurized again from the buffer, and enters the gas washing process again, the concentrated dilute ammonia washing liquid at the lower part of the gas washing tower 2 is pumped into an absorption water film formed on a boiling plate 10 through a pump, so that heat and ammonia gas in the high ammonia tail gas are absorbed, the hot dense ammonia liquid after the ammonia and the heat are discharged from the tower is discharged from the bottom of the tower, a large amount of waste heat is exchanged with water or other heat carriers through a heat preservation pipeline to be produced for preheating materials or be sent to a production office area, the dense ammonia water is recycled 19 to be used for heat recovery in a factory area, and the dense ammonia water is recycled for heating element for waiting.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided herein to facilitate understanding of the principles and embodiments of the present invention and to provide further advantages and practical applications for those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.