An ammonia tail gas absorption tower and supporting energy recovery system

Abstract

The invention discloses an ammonia tail gas absorption tower and a matching energy recovery system, comprising a boiling ammonia tail gas recovery tower, a scrubbing tower and a recovery component, wherein the boiling ammonia tail gas recovery tower is respectively connected with the scrubbing tower and the recovery component; the boiling ammonia tail gas recovery tower has a first tail gas inlet, a first tail gas outlet and a first washing liquid outlet, the scrubbing tower has a second tail gas inlet, a second tail gas outlet and a second washing liquid outlet, the scrubbing tower can be connected with an external water source, the first tail gas outlet is connected with the second tail gas inlet, the second washing liquid outlet is connected with the boiling ammonia tail gas recovery tower, a boiling plate is arranged in the boiling ammonia tail gas recovery tower, the boiling plate has an air inlet and an air outlet, the air inlet is connected with the air outlet, the air inlet is arranged toward the first tail gas inlet, the air outlet is arranged toward the connection between the second washing liquid outlet and the boiling ammonia tail gas recovery tower, and the first tail gas inlet is connected with the first tail gas outlet through the boiling plate.

Description

Technical Field

[0001] The present invention relates to the technical field of ammonia processing equipment and its peripheral supporting facilities, and in particular to an ammonia-containing tail gas absorption tower and a supporting energy recovery system. Background Art

[0002] Ammonia is very soluble in water, and 1 volume of water can absorb 700 volumes of ammonia. However, ammonia is a common raw material in industry and also a common tail gas pollution. The atmospheric emission standards stipulate the content of ammonia emissions. The traditional technology has the principle of a scrubber, the core of which is to pass the gas to be purified through the tower, and then sprinkle water into it, through spraying and atomization, while adding fillers and increasing the gas-water contact area, thereby increasing the efficiency of ammonia absorption.

[0003] The core working principle of a traditional scrubber is to spray water into the flowing gas. In this way, although the area of ​​gas-water mixing is relatively large during high-speed relative flow, due to the relative forces between water droplets and air flow, part of the gas never comes into contact with the water body, resulting in a large absorption space and low efficiency. As a result, traditional scrubbers often require 3 to 4 levels of scrubbing to achieve a relatively satisfactory emission situation.

[0004] Therefore, how to change the current situation of low scrubbing efficiency of the scrubber in the prior art has become an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] The object of the present invention is to provide an ammonia-containing tail gas absorption tower and a supporting energy recovery system to solve the problems existing in the above-mentioned prior art and improve the treatment and recovery efficiency of ammonia-containing tail gas.

[0006] To achieve the above-mentioned purpose, the present invention provides the following scheme: The present invention provides an ammonia-containing tail gas absorption tower and a supporting energy recovery system, comprising a boiling ammonia tail gas recovery tower, a scrubbing tower and a recovery component, wherein the boiling ammonia tail gas recovery tower is respectively connected to the scrubbing tower and the recovery component; the boiling ammonia tail gas recovery tower has a first tail gas inlet, a first tail gas outlet and a first washing liquid outlet, the scrubbing tower has a second tail gas inlet, a second tail gas outlet and a second washing liquid outlet, the scrubbing tower can be connected to an external water source, the first tail gas outlet is connected to the second tail gas inlet, the second washing liquid outlet is connected to the boiling ammonia tail gas recovery tower, a boiling plate is arranged in the boiling ammonia tail gas recovery tower, the boiling plate has an air inlet and an air outlet, the air inlet is connected to the air outlet, the air inlet is arranged toward the first tail gas inlet, the air outlet is arranged toward the connection between the second washing liquid outlet and the boiling ammonia tail gas recovery tower, and the first tail gas inlet is connected to the first tail gas outlet through the boiling plate.

[0007] Preferably, the first exhaust gas inlet is located at the bottom of the boiling ammonia exhaust gas recovery tower, the first exhaust gas outlet is located at the top of the boiling ammonia exhaust 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, and the second washing liquid outlet is connected to the top of the boiling plate. The second washing liquid outlet can drain the washing liquid discharged from the washing tower to the top of the boiling plate.

[0008] Preferably, the air inlet is arranged at one end of the boiling plate close to the axis of the boiling ammonia tail gas recovery tower, the other end of the boiling plate is connected to the inner wall of the boiling ammonia tail gas recovery tower, and the boiling plate is gradually inclined downward from the end connected to the boiling ammonia tail gas recovery tower toward the free end of the boiling plate.

[0009] Preferably, there are a plurality of boiling plates, and the plurality of boiling plates are evenly arranged along the axis of the boiling ammonia tail gas recovery tower, and the boiling plates in adjacent rows are staggered.

[0010] Preferably, there are a plurality of air outlets, the plurality of air outlets are evenly distributed, and the diameter of the air inlet is larger than the diameter of the air outlet.

[0011] Preferably, the free end of the boiling plate is connected to a washing liquid recovery pipe, the washing liquid recovery pipe is connected to the first washing liquid outlet, the recovery component includes a heat exchanger, the first washing liquid outlet is connected to the heat exchanger, and the heat exchanger is connected to a concentrated ammonia water recovery element.

[0012] Preferably, the scrubbing tower comprises a spraying zone, a filling zone and a collecting zone which are connected in sequence from top to bottom, the spraying zone is provided with a nozzle, the nozzle is connected to an external water source, the second exhaust gas outlet is provided at the top of the spraying zone, the second exhaust gas outlet is connected to the external environment, a gas disperser is provided in the collecting zone, the first exhaust gas outlet is connected to the collecting zone by means of the gas disperser, and the second washing liquid outlet is provided in the collecting zone.

[0013] Preferably, the number of the nozzles is multiple groups, and the multiple groups of nozzles are evenly distributed along the axial direction of the scrubbing tower. The axis of the nozzle is perpendicular to the axis of the scrubbing tower, and the multiple nozzles in each group are evenly distributed around the axis of the scrubbing tower.

[0014] Preferably, a transmission pump body is arranged between the second washing liquid outlet and the boiling ammonia tail gas recovery tower.

[0015] Compared with the prior art, the present invention has achieved the following technical effects: the ammonia-containing tail gas absorption tower and the supporting energy recovery system of the present invention include a boiling ammonia tail gas recovery tower, a scrubbing tower and a recovery component, the boiling ammonia tail gas recovery tower is respectively connected with the scrubbing tower and the recovery component; the boiling ammonia tail gas recovery tower has a first tail gas inlet, a first tail gas outlet and a first washing liquid outlet, the scrubbing tower has a second tail gas inlet, a second tail gas outlet and a second washing liquid outlet, the scrubbing tower can be connected with an external water source, the first tail gas outlet is connected with the second tail gas inlet, the second washing liquid outlet is connected with the boiling ammonia tail gas recovery tower, a boiling plate is arranged in the boiling ammonia tail gas recovery tower, the boiling plate has an air inlet and an air outlet, the air inlet is connected with the air outlet, the air inlet is arranged toward the first tail gas inlet, the air outlet is arranged toward the connection between the second washing liquid outlet and the boiling ammonia tail gas recovery tower, and the first tail gas inlet is connected with the first tail gas outlet through the boiling plate. The ammonia-containing tail gas absorption tower and the supporting energy recovery system of the present invention, when working, the 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, meets the water film that has absorbed a small amount of ammonia on the surface of the boiling plate, forms a boiling effect, and completes the absorption of a large amount of ammonia, the low-ammonia tail gas treated by the boiling ammonia tail gas recovery tower enters the scrubbing tower from the first tail gas outlet, the external water source is introduced into the scrubbing tower, contacts with the tail gas entering the scrubbing tower, absorbs the ammonia therein, and the purified qualified tail gas is discharged from the second tail gas outlet, the dilute ammonia washing liquid concentrated in the scrubbing tower is introduced into the boiling ammonia tail gas recovery tower, forms a water film on the boiling plate, circulates and absorbs the ammonia in the ammonia-containing tail gas, and in the boiling ammonia tail gas recovery tower, the hot concentrated ammonia washing liquid that has absorbed ammonia and heat enters the recovery component through the first washing liquid outlet to recover ammonia and heat. In the prior art, scrubbing equipment all adopts a method of spraying scrubbing liquid onto the exhaust gas. During the spraying process, the scrubbing liquid will avoid the gas, resulting in a poor scrubbing effect. It is necessary to set up multi-stage scrubbing equipment, which reduces the scrubbing work efficiency. The ammonia-containing exhaust gas absorption tower and the supporting energy recovery system of the present invention pass the ammonia-containing exhaust gas into a water film, which changes the existing passive scrubbing into active scrubbing, enhances the exhaust gas scrubbing effect, and improves the exhaust gas treatment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the ammonia-containing tail gas absorption tower and the supporting energy recovery system of the present invention;

[0018] Among them, 1 is a boiling ammonia tail gas recovery tower, 2 is a scrubbing tower, 3 is a recovery component, 4 is a first tail gas inlet, 5 is a first tail gas outlet, 6 is a first washing liquid outlet, 7 is a second tail gas inlet, 8 is a second tail gas outlet, 9 is a second washing liquid outlet, 10 is a boiling plate, 11 is a washing liquid recovery pipe, 12 is a heat exchanger, 13 is a spraying area, 14 is a packing area, 15 is a collecting area, 16 is a nozzle, 17 is a gas disperser, 18 is a transmission pump body, 19 is a concentrated ammonia water recovery element, and 20 is an external water source. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] The object of the present invention is to provide an ammonia-containing tail gas absorption tower and a supporting energy recovery system to solve the problems existing in the above-mentioned prior art and improve the treatment and recovery efficiency of ammonia-containing tail gas.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Please refer to Figure 1 , Figure 1 It is a schematic diagram of the ammonia-containing tail gas absorption tower and the supporting energy recovery system of the present invention.

[0023] The present invention provides an ammonia tail gas absorption tower and a supporting energy recovery system, comprising a boiling ammonia tail gas recovery tower 1, a scrubber 2 and a recovery component 3, wherein the boiling ammonia tail gas recovery tower 1 is connected to the scrubber 2 and the recovery component 3 respectively; the boiling ammonia tail gas recovery tower 1 has a first tail gas inlet 4, a first tail gas outlet 5 and a first washing liquid outlet 6, the scrubber 2 has a second tail gas inlet 7, a second tail gas outlet 8 and a second washing liquid outlet 9, and the scrubber 2 can be connected to an external water source 20. The first tail gas outlet 5 is connected with the second tail gas inlet 7, the second washing liquid outlet 9 is connected 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 has an air inlet and an air outlet, the air inlet is connected with the air outlet, the air inlet is arranged toward the first tail gas inlet 4, the air outlet is arranged toward the connection point between the second washing liquid outlet 9 and the boiling ammonia tail gas recovery tower 1, and the first tail gas inlet 4 is connected with the first tail gas outlet 5 through the boiling plate 10.

[0024] The ammonia-containing tail gas absorption tower and the supporting energy recovery system of the present invention, when working, the ammonia-containing tail gas enters the boiling ammonia tail gas recovery tower 1 from the first tail gas inlet 4, the ammonia-containing tail gas enters the boiling plate 10 from the air inlet, meets the water film that has absorbed a small amount of ammonia on the surface of the boiling plate 10, forms a boiling effect, and completes the absorption of a large amount of ammonia, the low-ammonia tail gas treated by the boiling ammonia tail gas recovery tower 1 enters the scrubber 2 from the first tail gas outlet 5, the external water source 20 is introduced into the scrubber 2, contacts with the tail gas entering the scrubber 2, absorbs the ammonia therein, and the purified qualified tail gas is discharged from the second tail gas outlet 8, the dilute ammonia washing liquid concentrated in the scrubber 2 is introduced into the boiling ammonia tail gas recovery tower 1, forms a water film on the boiling plate 10, and circulates to absorb the ammonia in the ammonia-containing tail gas, and in the boiling ammonia tail gas recovery tower 1, the hot concentrated ammonia washing liquid that has absorbed ammonia and heat enters the recovery component 3 through the first washing liquid outlet 6 to recover ammonia and heat. In the prior art, scrubbing equipment all adopts a method of spraying scrubbing liquid onto the exhaust gas. During the spraying process, the scrubbing liquid will avoid the gas, resulting in a poor scrubbing effect. It is necessary to set up multi-stage scrubbing equipment, which reduces the scrubbing work efficiency. The ammonia-containing exhaust gas absorption tower and the supporting energy recovery system of the present invention pass the ammonia-containing exhaust gas into a water film, which changes the existing passive scrubbing into active scrubbing, enhances the exhaust gas scrubbing effect, and improves the exhaust gas treatment efficiency.

[0025] Among them, the first tail gas inlet 4 is located at the bottom of the boiling ammonia tail gas recovery tower 1, the first tail gas outlet 5 is located at the top of the boiling ammonia tail gas recovery tower 1, the air inlet is located at the bottom of the boiling plate 10, which is convenient for the ammonia-containing tail gas to enter the boiling plate 10, and the second washing liquid outlet 9 is connected to the top of the boiling plate 10. The second washing liquid outlet 9 can drain the washing liquid discharged from the washing tower 2 to the top of the boiling plate 10. The air outlet is located at the top of the boiling plate 10, and the ammonia-containing tail gas enters the water film at the top of the boiling plate 10 from the air outlet to complete the washing, thereby avoiding the phenomenon of the washing liquid "avoiding" the tail gas.

[0026] Among them, the air inlet is arranged at one end of the boiling plate 10 close to the axis of the boiling ammonia tail gas recovery tower 1, and the other end of the boiling plate 10 is connected to the inner wall of the boiling ammonia tail gas recovery tower 1. The boiling plate 10 is gradually inclined downward from the end connected to the boiling ammonia tail gas recovery tower 1 toward the free end of the boiling plate 10, so as to facilitate the ammonia gas entering the boiling ammonia tail gas recovery tower 1 to enter the boiling plate 10, and at the same time, it is convenient for the water film on the top of the boiling plate 10 to absorb ammonia and flow smoothly into the first washing liquid outlet 6.

[0027] In this specific embodiment, there are multiple boiling plates 10 to further improve the working efficiency of the boiling ammonia tail gas recovery tower 1. The multiple boiling plates 10 are evenly distributed along the axis of the boiling ammonia tail gas recovery tower 1 to improve the uniformity of ammonia treatment. In addition, the structural stability of the boiling ammonia tail gas recovery tower 1 is improved. The boiling plates 10 in adjacent columns are staggered to enhance the ammonia treatment effect.

[0028] More specifically, there are multiple gas outlets, which are evenly distributed, thereby improving the uniformity with which the ammonia-containing exhaust gas enters the water film formed by the washing liquid and enhancing the ammonia treatment efficiency. In this specific embodiment, the diameter of the air inlet is larger than the diameter of the air outlet, ensuring that the ammonia-containing exhaust gas smoothly enters the boiling plate 10 and then enters the water film for washing.

[0029] In order to facilitate the collection of concentrated hot ammonia washing liquid, the free end of the boiling plate 10 is connected with a washing liquid recovery pipe 11, and the washing liquid recovery pipe 11 is connected with the first washing liquid outlet 6. The recovery component 3 includes a heat exchanger 12, and the first washing liquid outlet 6 is connected 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 factory heating or other purposes. The heat exchanger 12 is connected with a concentrated ammonia water recovery element 19, waiting for recycling production use.

[0030] Furthermore, the scrubbing tower 2 includes, from top to bottom, a spray zone 13, a packing zone 14 and a collecting zone 15 which are sequentially connected. The spray zone 13 is provided with a nozzle 16 which is connected to an external water source 20. The second exhaust gas outlet 8 is provided at the top of the spray zone 13, and the second exhaust gas outlet 8 is connected to the external environment. The collecting zone 15 is provided with a gas disperser 17. The first exhaust gas outlet 5 is connected to the collecting zone 15 by means of the gas disperser 17. The second washing liquid outlet 9 is provided in the collecting zone 15. The low-ammonia tail gas derived from the first tail gas outlet 5 enters the scrubbing tower 2 through the second tail gas inlet 7, is evenly dispersed in the scrubbing tower 2 through the gas disperser 17, and is guided by air pressure to move to the upper part of the scrubbing tower 2. Clean water is pressurized and sprayed out from the nozzle on the top of the scrubbing tower 2, forming a fog rain area in the spray area 13. The water falls downward into the packing area 14 and forms a water film in the packing area 14, which contacts the low-ammonia tail gas coming up from the collection area 15 and absorbs the ammonia therein. The purified qualified tail gas is discharged from the second tail gas outlet 8, and the unqualified gas is re-pressurized and the tail gas enters the scrubbing process again.

[0031] In order to form uniform mist rain in the spray area 13, there are multiple groups of nozzles 16, which are evenly distributed along the axis of the scrubbing tower 2. The axis of the nozzle 16 is perpendicular to the axis of the scrubbing tower 2, and the multiple nozzles 16 in each group are evenly distributed around the axis of the scrubbing tower 2.

[0032] 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 the washing liquid. Similarly, a 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 washing tower 2 to ensure normal operation of the system.

[0033] The ammonia-containing tail gas absorption tower and the supporting energy recovery system of the present invention are as follows: when working, the ammonia-containing tail gas is pressurized into the boiling plate 10 from the pipeline at the bottom of the boiling ammonia tail gas recovery tower 1, meets the water film that has absorbed a small amount of ammonia on the surface of the boiling plate 10, forms a boiling effect, completes the absorption of a large amount of ammonia, and the low-ammonia tail gas after the first-stage absorption is discharged from the tower from the pipeline at the top of the boiling ammonia tail gas recovery tower 1; the low-ammonia tail gas enters the lower part of the scrubber tower 2 through the elbow, is evenly dispersed in the tower through the gas disperser 17, and is guided by air pressure to move to the upper part of the scrubber tower 2, and clean water is pressurized and sprayed from the nozzle at the top of the scrubber tower 2, forming a fog rain area in the tower top area, and the water falls downward into the filler area 14, and forms a water film on the filler, contacts with the low-ammonia tail gas coming up from the bottom of the tower, and absorbs it. ammonia in the tail gas; the qualified tail gas is discharged from the top of the tower through the detector and the buffer, and the unqualified gas is re-pressurized from the buffer and the tail gas enters the scrubbing process again; the dilute ammonia washing liquid concentrated in the lower part of the scrubbing tower 2 is pumped into the absorption water film formed on the boiling plate 10, so as to absorb the heat and ammonia in the high ammonia tail gas in a cycle; there is a washing liquid recovery pipe 11 in the middle of the boiling ammonia tail gas recovery tower 1, and the hot concentrated ammonia liquid that has absorbed ammonia and heat flows out from the bottom of the tower, enters the heat exchanger 12 through the action of the pump, and exchanges the large amount of waste heat contained in it for water or other heat carriers. The heat is sent to the production through the insulation pipe to preheat the materials, or to the production office and living area to heat the factory area; the concentrated ammonia water that has exchanged the heat enters the concentrated ammonia water recovery element 19, waiting for the recycling production use.

[0034] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An ammonia tail gas absorption tower and a supporting energy recovery system, characterized in that: The invention comprises a boiling ammonia tail gas recovery tower, a scrubber and a recovery component, wherein the boiling ammonia tail gas recovery tower is respectively connected with the scrubber and the recovery component; the boiling ammonia tail gas recovery tower has a first tail gas inlet, a first tail gas outlet and a first washing liquid outlet, the scrubber has a second tail gas inlet, a second tail gas outlet and a second washing liquid outlet, the scrubber can be connected with an external water source, the first tail gas outlet is connected with the second tail gas inlet, the second washing liquid outlet is connected with the boiling ammonia tail gas recovery tower, a boiling plate is arranged in the boiling ammonia tail gas recovery tower, the boiling plate has an air inlet and an air outlet, the air inlet is connected with the air outlet The air inlet is arranged toward the direction of the first tail gas inlet, and the air outlet is arranged toward the connection point between the second washing liquid outlet and the boiling ammonia tail gas recovery tower, and the first tail gas inlet is connected with the first tail gas outlet through the boiling plate; the first tail gas inlet is located at the bottom of the boiling ammonia tail gas recovery tower, and 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, and the air outlet is located at the top of the boiling plate, and the second washing liquid outlet is connected with the top of the boiling plate, and the second washing liquid outlet can drain the washing liquid discharged from the washing tower to the top of the boiling plate.

2. The ammonia-containing tail gas absorption tower and the supporting energy recovery system according to claim 1 are characterized in that: The air inlet is arranged at one end of the boiling plate close to the axis of the boiling ammonia tail gas recovery tower, and the other end of the boiling plate is connected to the inner wall of the boiling ammonia tail gas recovery tower. The boiling plate is gradually inclined downward from the end connected to the boiling ammonia tail gas recovery tower toward the free end of the boiling plate.

3. The ammonia-containing tail gas absorption tower and the supporting energy recovery system according to claim 2 are characterized in that: There are multiple boiling plates, which are evenly distributed along the axis of the boiling ammonia tail gas recovery tower, and the boiling plates in adjacent rows are staggered.

4. The ammonia-containing tail gas absorption tower and the supporting energy recovery system according to claim 3 are characterized in that: There are multiple air outlets, which are evenly distributed. The diameter of the air inlet is larger than that of the air outlet.

5. The ammonia-containing tail gas absorption tower and the supporting energy recovery system according to claim 4, characterized in that: The free end of the boiling plate is connected to a washing liquid recovery pipe, which is communicated with the first washing liquid outlet. The recovery component includes a heat exchanger, which is communicated with the first washing liquid outlet, and the heat exchanger is connected to a concentrated ammonia water recovery element.

6. The ammonia-containing tail gas absorption tower and the supporting energy recovery system according to claim 1, characterized in that: The scrubbing tower includes a spraying area, a filling area and a collecting area which are connected in sequence from top to bottom. The spraying area is provided with a nozzle, and the nozzle is connected to an external water source. The second tail gas outlet is provided at the top of the spraying area, and the second tail gas outlet is connected to the external environment. A gas disperser is provided in the collecting area, and the first tail gas outlet is connected to the collecting area by means of the gas disperser. The second washing liquid outlet is provided in the collecting area.

7. The ammonia-containing tail gas absorption tower and the supporting energy recovery system according to claim 6 are characterized in that: The number of the nozzles is multiple groups, and the multiple groups of nozzles are evenly distributed along the axis of the scrubbing tower. The axis of the nozzle is perpendicular to the axis of the scrubbing tower, and the multiple nozzles in each group are evenly distributed around the axis of the scrubbing tower.

8. The ammonia-containing tail gas absorption tower and the supporting energy recovery system according to claim 1, characterized in that: A transmission pump body is arranged between the second washing liquid outlet and the boiling ammonia tail gas recovery tower.

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