Ammonia gas recovery treatment device

Abstract

The utility model provides an ammonia gas recovery treatment device which comprises a falling film absorption tower module, a packing absorption tower module and an exhaust funnel, the falling film absorption tower module comprises a plurality of falling film absorption towers, and any two adjacent falling film absorption towers are communicated through a first connecting air pipe; the packing absorption tower module comprises a plurality of packing absorption towers, and any two adjacent packing absorption towers are communicated through a second connecting air pipe; the falling film absorption tower module is connected with the packing absorption tower module through a gas inlet connecting pipe; an induced draft fan is arranged in the exhaust funnel, and the packing absorption tower closest to the exhaust funnel in the packing absorption tower module is connected with the induced draft fan through a second connecting air pipe; waste gas treated by the packing absorption tower module can be transported to an exhaust funnel through an induced draft fan for up-to-standard emission; an ammonia water recovery module is also arranged in each falling film absorption tower; and each falling film absorption tower is externally connected with a cooling heat exchange module.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment, in particular to an ammonia recovery and treatment device. Background Art

[0002] Ammonia is an inorganic compound with the chemical formula NH3 and a molecular weight of 17.031. It is colorless and has a strong pungent odor. Its density is 0.7710 g / L and its relative density is 0.5971. It is easily liquefied into a colorless liquid. It can be liquefied under pressure at room temperature. Its boiling point is -33.5°C and it is also easily solidified into a snow-like solid. Its melting point is -77.75°C and it is soluble in water, ethanol and ether. It decomposes into nitrogen and hydrogen at high temperatures and has a reducing effect. It can be oxidized into nitric oxide in the presence of a catalyst. It is used to make liquid nitrogen, ammonia water, nitric acid, ammonium salts and amines. It can be directly synthesized from nitrogen and hydrogen and can burn the skin, eyes and respiratory mucosa. Excessive inhalation can cause lung swelling and even death.

[0003] During the production process, manufacturing enterprises will generate some waste gas containing high concentration of ammonia. The main component of this waste gas is ammonia, which has a strong odor and has a great impact and harm on the environment.

[0004] However, the current traditional ammonia waste gas treatment process is mainly acid absorption or water absorption, and direct acid washing of high-concentration waste gas will put a heavy burden on the equipment and cause a certain waste of resources.

[0005] Therefore, in view of the problems existing in the prior art, there is an urgent need for an ammonia recovery and processing device that can have a combined processing process and corresponding ammonia recovery and processing equipment, which can not only recover ammonia but also ensure stable operation of the equipment. Utility Model Content

[0006] In order to solve the problems existing in the prior art, the utility model provides an ammonia recovery and treatment device. The ammonia recovery and treatment device of the present application includes multiple falling film absorption towers and packed absorption towers, wherein the packed absorption tower also includes an acid absorption tower and a water absorption tower; the ammonia recovery and treatment device of the present application can further reduce the concentration of ammonia through multiple falling film absorption towers to prevent a heavy burden on the equipment; and the ammonia recovery and treatment device of the present application also has a combined treatment process of acid absorption and water absorption, which can improve the treatment efficiency of ammonia and ensure the stability of equipment operation; the ammonia recovery and treatment device of the present application ensures that the waste gas can stably meet the relevant national standards for a long time after being treated by the equipment.

[0007] In order to achieve the above-mentioned purpose, the utility model proposes an ammonia recovery and treatment device, including a falling film absorption tower module, a packed absorption tower module, and an exhaust pipe;

[0008] The falling film absorption tower module includes a plurality of falling film absorption towers, and any two adjacent falling film absorption towers are connected through a first connecting air duct; the falling film absorption tower module is used to initially recover ammonia in the exhaust gas to reduce the ammonia concentration;

[0009] The packed absorption tower module includes a plurality of packed absorption towers, and any two adjacent packed absorption towers are connected via a second connecting air duct; the packed absorption tower module is used to further remove ammonia in the exhaust gas;

[0010] The falling film absorption tower module is connected to the packed absorption tower module through an air inlet connecting pipe;

[0011] An induced draft fan is provided in the exhaust pipe, and the packed absorption tower closest to the exhaust pipe in the packed absorption tower module is connected to the induced draft fan through a second connecting air duct; the waste gas treated by the packed absorption tower module can be transported to the exhaust pipe through the induced draft fan for emission up to standard;

[0012] Each falling film absorption tower is also provided with an ammonia water recovery module; and each falling film absorption tower is externally connected with a cooling and heat exchange module.

[0013] Preferably, the falling film absorber module comprises a primary falling film absorber, a secondary falling film absorber and a tertiary falling film absorber; the primary falling film absorber, the secondary falling film absorber and the tertiary falling film absorber all have the same falling film absorber structure.

[0014] Preferably, the outer sides of the first-stage falling film absorption tower, the second-stage falling film absorption tower and the third-stage falling film absorption tower are all connected to a first circulating water pump.

[0015] Preferably, the ammonia water recovery module comprises a temporary storage tank, and the center of the bottom of the first-stage falling film absorption tower, the second-stage falling film absorption tower and the third-stage falling film absorption tower are all provided with a temporary storage tank.

[0016] Preferably, the cooling and heat exchange module comprises a cooling water inlet device and a cooling water outlet device; the first-stage falling film absorption tower, the second-stage falling film absorption tower and the third-stage falling film absorption tower are respectively provided with a cooling water inlet device and a cooling water outlet device on both sides of their exteriors.

[0017] Preferably, the falling film absorption tower structure includes an exhaust gas inlet, an exhaust gas outlet, a circulating water inlet, a circulating water outlet, a cooling water inlet, a cooling tube, a cooling water outlet, a first shell, and a supporting skirt;

[0018] The exhaust gas inlet is arranged at the top of the first shell, the exhaust gas outlet is arranged at a position close to the bottom of one side of the first shell, and the exhaust gas outlet can be connected to the exhaust gas inlet at the top of the first shell of the adjacent falling film absorption tower through the first connecting air duct;

[0019] The circulating water inlet is arranged at a position near the top of one side of the first shell, the circulating water outlet is arranged at the bottom of the first shell, the water outlet of the first circulating water pump is connected to the circulating water inlet through a pipeline, the circulating water outlet is communicated with the inlet of the temporary storage tank, and a corresponding valve member is arranged at the connection between the circulating water outlet and the temporary storage tank, and the outlet of the temporary storage tank is connected to the water inlet of the first circulating water pump;

[0020] The cooling water inlet is arranged at a position close to the bottom of one side of the first shell, the cooling water outlet is arranged at a position close to the top of the other side of the first shell, the cooling tube is arranged in the first shell, the cooling water inlet is connected to the cooling water inlet device, and the cooling water outlet is connected to the cooling water outlet device;

[0021] The support skirt is arranged near the middle of the first shell, and the support skirt can play a supporting and limiting role in the installation of the first shell.

[0022] Preferably, the packed absorption tower module comprises a primary packed absorption tower and a secondary packed absorption tower; the primary packed absorption tower is an acid absorption tower, and the secondary packed absorption tower is a water absorption tower;

[0023] The first-stage packed absorption tower and the second-stage packed absorption tower both have the same packed absorption tower structure.

[0024] Preferably, the outer sides of the primary packed absorption tower and the secondary packed absorption tower are both connected to a second circulating water pump.

[0025] Preferably, the packed absorption tower structure includes an air outlet, an air inlet, a packing demisting device, a packing absorption device, a second shell, a manhole sight glass, an overflow port, a liquid level gauge port, a drain port, a water replenishment port, a dosing port, a circulating water tank, and a circulating water pump water inlet;

[0026] An air outlet is provided on the top of the second shell, and an air inlet is provided on one side of the second shell near the bottom. The air outlet of the first-stage packed absorption tower can be connected to the air inlet of the second-stage packed absorption tower through the second connecting air duct; the air outlet of the second-stage packed absorption tower can be connected to the induced draft fan in the exhaust pipe through the second connecting air duct;

[0027] The packing absorption device is arranged inside the second shell; a packing demisting device is arranged between the packing absorption device and the air outlet, and the packing demisting device adopts a Φ38 multi-faceted hollow ball; a plurality of manhole sight glasses for observing the situation inside the tower are arranged on the side of the second shell;

[0028] A circulating water tank is provided on one side of the second shell, and the bottom of the second shell is connected to the circulating water tank. A circulating water pump water inlet is provided on the circulating water tank, and the circulating water tank is connected to the second circulating water pump through the circulating water pump water inlet; a water replenishment port for adding water and a dosing port for adding a medicine are also provided on the circulating water tank;

[0029] An overflow port, a liquid level gauge port, and a drain port are provided on the outer side of the second shell near the bottom, and the drain port is located below the overflow port.

[0030] Preferably, the filler absorption device comprises at least two filler absorption modules stacked one above the other, and the filler absorption module comprises a spray system, a filler layer, and a support plate for supporting the filler layer;

[0031] The spray system is located above the packing layer, and a support plate is provided below the packing layer; the packing layer adopts Φ50 polyhedral hollow balls; the spray system includes a spray pipe and a plurality of spiral nozzles;

[0032] The water outlet of the second circulating water pump is communicated with the spray system.

[0033] The high-concentration ammonia collected by an ammonia recovery and treatment device of the present application first passes through the primary, secondary, and tertiary falling film absorption towers, and the ammonia in the exhaust gas is initially recovered to assist in reducing the ammonia concentration in the exhaust gas. The recovered ammonia water will enter the temporary storage tank for subsequent circulation operation through the first circulating water pump; in addition, the primary, secondary, and tertiary falling film absorption towers of the present application can further improve the ammonia absorption efficiency by means of cooling water heat exchange; the cooling water can be cold ethylene glycol; when cold ethylene glycol is used to cool the circulating water, the cooling water enters from the cooling water inlet at the bottom of the tower and flows out from the cooling water outlet at the top of the tower; the built-in cooling tubes of the falling film absorption tower are evenly arranged with 316L material tubes; the circulating water uses 7-degree water, and the water and exhaust gas enter the tower from the exhaust gas inlet at the top of the tower, and enter in the same direction; water is sprayed on the 316L heat exchange tube;

[0034] The exhaust gas absorption liquid in the primary, secondary and tertiary falling film absorption towers can be circulated through the first circulating water pump to further absorb ammonia in the exhaust gas to increase the concentration of ammonia water and recover ammonia water. After reaching a certain sewage concentration, the ammonia water is pumped into the ammonia water preparation kettle for reuse.

[0035] The waste gas pre-treated by the primary, secondary and tertiary falling film absorption towers is then sent to the primary packed absorption tower (i.e. acid absorption tower) through the air inlet connecting pipe for acid absorption, and reagents and water are added to form a reagent absorption liquid to further absorb and treat ammonia in the waste gas; after the waste gas passes through the primary packed absorption tower (i.e. acid absorption tower) and enters the secondary packed absorption tower (i.e. water absorption tower) through the second connecting air duct, the residual reagent in the waste gas can be removed;

[0036] The first-level and second-level packed absorption towers are equipped with packing support plates, and the packing can be placed on the packing support plates in a random or integral manner. The reagent absorption liquid is sent into the spraying system through the second circulating water pump, and then sprayed onto the packing, and flows down along the packing surface in the packing layer. The exhaust gas enters from the air inlet at the bottom of the tower, is in a countercurrent state relative to the hand washing liquid, and continuously passes through the gaps of the packing in the packing layer. On the surface of the packing, the gas-liquid two phases are in close contact for mass transfer. The first-level and second-level packed absorption towers are each provided with at least two sets of packing absorption modules near the outlet, one set is a packing demisting device, and the other set is a wire mesh demisting device.

[0037] The agent absorption liquid in the primary and secondary packed absorption towers can be recycled through the second circulating water pump 15, and resources can be saved by recycling the agent and water. When the agent absorption liquid is saturated, it can pass through the waste gas discharge device and then enter the sewage pool regulating tank for treatment, thereby ensuring the efficient operation of the treatment system.

[0038] An ammonia recovery and treatment device of the utility model comprises a plurality of falling film absorption towers and a packed absorption tower, wherein the packed absorption tower also comprises an acid absorption tower and a water absorption tower; the ammonia recovery and treatment device of the present application can further reduce the concentration of ammonia through the plurality of falling film absorption towers, thereby preventing a heavy burden on the equipment; and the ammonia recovery and treatment device of the present application also has a combined treatment process of acid absorption and water absorption, which can improve the treatment efficiency of ammonia and ensure the stability of equipment operation; the ammonia recovery and treatment device of the present application ensures that the waste gas can stably meet the relevant national standards for a long time after being treated by the equipment.

[0039] The utility model discloses an ammonia recovery and treatment device, which can improve the resource recovery rate, ensure the waste gas treatment effect, and has good economic and environmental benefits.

[0040] Compared with the prior art, the utility model has the following beneficial effects:

[0041] 1. An ammonia recovery and treatment device of the utility model includes multiple falling film absorption towers and packed absorption towers, wherein the packed absorption tower also includes an acid absorption tower and a water absorption tower; the ammonia recovery and treatment device of the present application can further reduce the concentration of ammonia through multiple falling film absorption towers to prevent a heavy burden on the equipment; and the ammonia recovery and treatment device of the present application also has a combined treatment process of acid absorption and water absorption, which can improve the treatment efficiency of ammonia and ensure the stability of equipment operation; the ammonia recovery and treatment device of the present application ensures that the waste gas can stably meet the relevant national standards for a long time after being treated by the equipment.

[0042] 2. The ammonia recovery and treatment device of the utility model can improve the resource recovery rate, ensure the waste gas treatment effect, and has good economic and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 This is a schematic diagram of the planar structure of an ammonia recovery and treatment device of the utility model;

[0045] Figure 2 It is a plan view of the structure of the falling film absorption tower of the utility model;

[0046] Figure 3 It is a plan view of the packed absorption tower structure of the utility model;

[0047] Among them, as shown in the figure: exhaust pipe 1, first connecting air duct 2, second connecting air duct 3, air inlet connecting pipe 4, induced draft fan 5, first falling film absorption tower 6, exhaust gas inlet 61, exhaust gas outlet 62, circulating water inlet 63, circulating water outlet 64, cooling water inlet 65, cooling tube 66, cooling water outlet 67, first shell 68, support skirt 69, second falling film absorption tower 7, third falling film absorption tower 8, first circulating water pump 9, temporary storage tank 10, cooling water inlet device 1 1. Cooling water outlet device 12, primary packed absorption tower 13, air outlet 131, air inlet 132, packed defogger 133, second shell 134, manhole sight glass 135, overflow port 136, liquid level gauge port 137, drain port 138, water replenishment port 139, dosing port 140, circulating water tank 141, circulating water pump water inlet 142, spray system 143, packing layer 144, support plate 145, secondary packed absorption tower 14, second circulating water pump 15. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiment of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0049] Embodiment 1

[0050] like Figure 1-3 As shown, this embodiment proposes an ammonia recovery and treatment device, including a falling film absorption tower module, a packed absorption tower module, and an exhaust pipe 1;

[0051] The falling film absorption tower module includes a plurality of falling film absorption towers, and any two adjacent falling film absorption towers are connected through a first connecting air duct 2; the falling film absorption tower module is used to initially recover ammonia in the exhaust gas and reduce the ammonia concentration;

[0052] The packed absorption tower module includes a plurality of packed absorption towers, and any two adjacent packed absorption towers are connected via a second connecting air duct 3; the packed absorption tower module is used to further remove ammonia in the exhaust gas;

[0053] The falling film absorption tower module is connected to the packed absorption tower module via an air inlet connecting pipe 4;

[0054] The exhaust pipe 1 is provided with an induced draft fan 5, and the packed absorption tower closest to the exhaust pipe 1 in the packed absorption tower module is connected to the induced draft fan 5 through the second connecting air duct 3; the waste gas treated by the packed absorption tower module can be transported to the exhaust pipe 1 through the induced draft fan 5 for standard discharge;

[0055] Each falling film absorption tower is also provided with an ammonia water recovery module; and each falling film absorption tower is externally connected with a cooling and heat exchange module.

[0056] like Figure 1 As shown, the falling film absorber module comprises a primary falling film absorber 6, a secondary falling film absorber 7, and a tertiary falling film absorber 8; the primary falling film absorber 6, the secondary falling film absorber 7, and the tertiary falling film absorber 8 all have the same falling film absorber structure.

[0057] The outer sides of the first falling film absorption tower 6 , the second falling film absorption tower 7 , and the third falling film absorption tower 8 are all connected to a first circulating water pump 9 .

[0058] The ammonia water recovery module comprises a temporary storage tank 10 , and the temporary storage tank 10 is provided at the center of the bottom of each of the first-stage falling film absorption tower 6 , the second-stage falling film absorption tower 7 , and the third-stage falling film absorption tower 8 .

[0059] The cooling heat exchange module includes a cooling water inlet device 11 and a cooling water outlet device 12; the first-stage falling film absorption tower 6, the second-stage falling film absorption tower 7, and the third-stage falling film absorption tower 8 are respectively provided with a cooling water inlet device 11 and a cooling water outlet device 12 on both sides of their exteriors.

[0060] like Figure 2 As shown, the falling film absorption tower structure includes a waste gas inlet 61, a waste gas outlet 62, a circulating water inlet 63, a circulating water outlet 64, a cooling water inlet 65, a cooling tube 66, a cooling water outlet 67, a first shell 68, and a support skirt 69;

[0061] The exhaust gas inlet 61 is provided at the top of the first shell 68, and the exhaust gas outlet 62 is provided at a position close to the bottom of one side of the first shell 68, and the exhaust gas outlet 62 can be connected to the exhaust gas inlet 61 at the top of the first shell 68 of the adjacent falling film absorption tower through the first connecting air duct 2;

[0062] The circulating water inlet 63 is arranged at a position near the top of one side of the first shell 68, and the circulating water outlet 64 is arranged at the bottom of the first shell 68. The water outlet of the first circulating water pump 9 is connected to the circulating water inlet 63 through a pipeline, and the circulating water outlet 64 is communicated with the inlet of the temporary storage tank 10, and a corresponding valve member is arranged at the connection between the circulating water outlet 64 and the temporary storage tank 10, and the outlet of the temporary storage tank 10 is connected to the water inlet of the first circulating water pump 9;

[0063] The cooling water inlet 65 is provided at a position close to the bottom of one side of the first shell 68, and the cooling water outlet 67 is provided at a position close to the top of the other side of the first shell 68. The cooling tubes 66 are provided in the first shell 68, and the cooling water inlet 65 is connected to the cooling water inlet device 11, and the cooling water outlet 67 is connected to the cooling water outlet device 12.

[0064] The support skirt 69 is disposed near the middle of the first shell 68 , and the support skirt 69 can support and limit the installation of the first shell 68 .

[0065] like Figure 1 As shown, the packed absorption tower module includes a primary packed absorption tower 13 and a secondary packed absorption tower 14; the primary packed absorption tower 13 is an acid absorption tower, and the secondary packed absorption tower 14 is a water absorption tower;

[0066] The first-stage packed absorption tower 13 and the second-stage packed absorption tower 14 both have the same packed absorption tower structure.

[0067] The outer sides of the primary packed absorption tower 13 and the secondary packed absorption tower 14 are both connected to a second circulating water pump 15 .

[0068] like Figure 3 As shown, the packed absorption tower structure includes an air outlet 131, an air inlet 132, a packing demisting device 133, a packing absorption device, a second shell 134, a manhole sight glass 135, an overflow port 136, a liquid level meter port 137, a drain port 138, a water replenishment port 139, a dosing port 140, a circulating water tank 141, and a circulating water pump water inlet 142;

[0069] An air outlet 131 is provided on the top of the second shell 134, and an air inlet 132 is provided on one side of the second shell 134 near the bottom. The air outlet 131 of the first-stage packing absorption tower 13 can be connected to the air inlet 132 of the second-stage packing absorption tower 14 through the second connecting air duct 3; the air outlet 131 of the second-stage packing absorption tower 14 can be connected to the induced draft fan 5 in the exhaust pipe 1 through the second connecting air duct 3;

[0070] The packing absorption device is arranged inside the second shell 134; a packing demister 133 is arranged between the packing absorption device and the air outlet 131, and the packing demister 133 adopts a Φ38 multi-faceted hollow ball; a plurality of manhole mirrors 135 for observing the situation inside the tower are arranged on the side of the second shell 134;

[0071] A circulating water tank 141 is provided on one side of the second shell 134, and the bottom of the second shell 134 is in communication with the circulating water tank 141. A circulating water pump water inlet 142 is provided on the circulating water tank 141, and the circulating water tank 141 is connected to the second circulating water pump 15 through the circulating water pump water inlet 142; the circulating water tank 141 is also provided with a water replenishment port 139 for adding water and a dosing port 140 for adding a medicine;

[0072] An overflow port 136 , a liquid level gauge port 137 , and a drain port 138 are provided on the outer side of the second shell 134 near the bottom. The drain port 138 is located below the overflow port 136 .

[0073] The filler absorption device comprises at least two filler absorption modules stacked one above the other, and the filler absorption module comprises a spray system 143, a filler layer 144, and a support plate 145 for supporting the filler layer 144;

[0074] The spray system 143 is located above the packing layer 144, and a support plate 145 is provided below the packing layer 144; the packing layer 144 uses Φ50 polyhedral hollow balls; the spray system 143 includes a spray pipe and a plurality of spiral nozzles;

[0075] The water outlet of the second circulating water pump 15 is communicated with the spray system 143 .

[0076] When this embodiment is working, the waste gas is sent in through the air inlet 132, and the chemical liquid is sprayed onto the packing by the spray system 143 and flows down along the surface of the packing; the waste gas and the chemical liquid are countercurrently passed through the gaps of the packing layer 144 continuously; on the surface of the packing, the gas and liquid are in close contact for mass transfer; the waste gas after absorption is sent out of the packing absorption tower through the air outlet 131.

[0077] Among them, the filler demisting device 133 can play a role in reducing the influence of the tiny particles brought up during the working process on the normal working process.

[0078] When the medicinal liquid flows downward along the packing layer 144, it tends to gradually concentrate on the wall of the packing absorption tower, so that the liquid flow rate near the tower wall gradually increases. The medicinal liquid flowing down from the upper packing is collected and sent to the circulating water tank 141. The circulating water tank 141 is connected to the second circulating water pump 15 through the circulating water pump inlet 142. Therefore, the medicinal liquid can be sent to the spraying system 143 through the second circulating water pump 15 and further sprayed to the packing layer 144.

[0079] The manhole sight glass 135 can be used to monitor the working conditions in the packed absorption tower in real time to ensure that the work can proceed smoothly.

[0080] The method of using the ammonia recovery and treatment device of this embodiment is as follows:

[0081] Step 1: The collected high-concentration ammonia gas is sequentially introduced into a primary falling film absorption tower 6, a secondary falling film absorption tower 7, and a tertiary falling film absorption tower 8 to initially recover the ammonia gas in the exhaust gas to reduce the concentration of ammonia gas in the exhaust gas; the recovered ammonia water enters the temporary storage tank 10 below. At the same time, in order to improve the ammonia absorption efficiency, the primary falling film absorption tower 6, the secondary falling film absorption tower 7, and the tertiary falling film absorption tower 8 all adopt a cooling water heat exchange process;

[0082] Step 2: the waste gas pre-treated by the primary falling film absorption tower 6, the secondary falling film absorption tower 7, and the tertiary falling film absorption tower 8 is sent to the primary packed absorption tower 13 (i.e., the acid absorption tower) through the air inlet connecting pipe 4, and the reagent and water are added into the absorption tower through the water replenishment port 139 and the drug addition port 140 to form an absorption liquid, so as to further absorb the ammonia in the waste gas;

[0083] Step 3: the waste gas passing through the primary packing absorption tower 13 (i.e., the acid absorption tower) enters the secondary packing absorption tower 14 (i.e., the water absorption tower) through the second connecting air duct 3, and the secondary packing absorption tower 14 can remove the residual agent in the waste gas;

[0084] Step 4: The waste gas treated by the primary packed absorption tower 13 and the secondary packed absorption tower 14 passes through the exhaust pipe 1 and enters the sewage pool regulating tank for treatment to ensure the efficient operation of the treatment system.

[0085] Step 5: The absorption liquid of the first-stage falling film absorption tower 6, the second-stage falling film absorption tower 7, and the third-stage falling film absorption tower 8 enters the temporary storage tank 10, and then circulates through the first circulating water pump 9 to repeatedly absorb ammonia in the exhaust gas, increase the concentration of ammonia water and recover ammonia water again. The absorption liquid of the first-stage falling film absorption tower 6, the second-stage falling film absorption tower 7, and the third-stage falling film absorption tower 8 can also be circulated through the first circulating water pump 9. After reaching a certain sewage degree, the ammonia water is pumped into the ammonia water preparation kettle for reuse.

[0086] The cooling water in step 1 can be cold ethylene glycol; when cold ethylene glycol is used to cool the circulating liquid, the cooling water enters from the cooling water inlet 65 at the bottom of the tower and flows out from the cooling water outlet 67 at the top of the tower; the cooling tubes 66 built into the falling film absorption tower are evenly arranged with 316L material tubes; the circulating water uses 7-degree water, and the water and the exhaust gas enter the tower from the exhaust gas inlet 61 at the top of the tower in the same direction; the water is sprayed on the 316L cooling tubes 66;

[0087] Among them, the first-level packed absorption tower 13 and the second-level packed absorption tower 14 in step 2 and step 3 are equipped with a packing support plate 145, and the packing in the packing layer 144 can be placed on the support plate 145 by random stacking or whole-building. The circulating liquid is sent to the spray system 143 through the second circulating water pump 15, and then sprayed on the packing, and flows down along the surface of the packing in the packing layer 144. The exhaust gas enters from the air inlet 132 at the bottom of the tower, in a countercurrent state relative to the liquid, and continuously passes through the gaps of the packing in the packing layer 144. On the surface of the packing, the gas-liquid two phases are in close contact for mass transfer. The first-level packed absorption tower 13 and the second-level packed absorption tower 14 are both provided with at least two sets of packing absorption modules near the outlet, one set is a packing demisting device, and the other set is a wire mesh demisting device.

[0088] Among them, the agent absorption liquid described in step 2 and step 3 can be recycled through the second circulating water pump 15, and resources can be saved by recycling the agent and water. When the agent absorption liquid is saturated, it can pass through the waste gas discharge device and then enter the sewage pool regulating tank for treatment, thereby ensuring the efficient operation of the treatment system.

[0089] An ammonia recovery and treatment device of the present embodiment includes multiple falling film absorption towers and packed absorption towers, wherein the packed absorption tower also includes an acid absorption tower and a water absorption tower; the ammonia recovery and treatment device of the present application can further reduce the concentration of ammonia through multiple falling film absorption towers to prevent a heavy burden on the equipment; and the ammonia recovery and treatment device of the present application also has a combined treatment process of acid absorption and water absorption, which can improve the treatment efficiency of ammonia and ensure the stability of equipment operation; the ammonia recovery and treatment device of the present application ensures that the exhaust gas can stably meet the relevant national standards for a long time after being treated by the equipment.

[0090] An ammonia recovery and treatment device of the present embodiment can improve the resource recovery rate, ensure the waste gas treatment effect, and has good economic and environmental benefits.

[0091] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. All equivalent changes or modifications made according to the structure, features and principles described in the patent application scope of the present invention should be included in the patent application scope of the present invention.

[0092] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the utility model, which are used to illustrate the technical solution of the utility model, rather than to limit it. The protection scope of the utility model is not limited thereto. Although the utility model is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above-mentioned embodiments within the technical scope disclosed by the utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the utility model, and should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An ammonia recovery and treatment device, characterized in that: It comprises a falling film absorption tower module, a packed absorption tower module and an exhaust pipe (1); The falling film absorption tower module comprises a plurality of falling film absorption towers, and any two adjacent falling film absorption towers are connected via a first connecting air duct (2); the falling film absorption tower module is used to initially recover ammonia in the exhaust gas and reduce the ammonia concentration; The packed absorption tower module comprises a plurality of packed absorption towers, and any two adjacent packed absorption towers are connected via a second connecting air duct (3); the packed absorption tower module is used to further remove ammonia in the exhaust gas; The falling film absorption tower module is connected to the packed absorption tower module via an air inlet connecting pipe (4); An induced draft fan (5) is provided in the exhaust pipe (1); the packed absorption tower in the packed absorption tower module closest to the exhaust pipe (1) is connected to the induced draft fan (5) via a second connecting air duct (3); the waste gas treated by the packed absorption tower module can be transported to the exhaust pipe (1) via the induced draft fan (5) for emission in compliance with the standards; Each falling film absorption tower is also provided with an ammonia water recovery module; and each falling film absorption tower is externally connected with a cooling and heat exchange module.

2. The ammonia recovery and processing device according to claim 1, characterized in that: The falling film absorption tower module comprises a first-stage falling film absorption tower (6), a second-stage falling film absorption tower (7), and a third-stage falling film absorption tower (8); the first-stage falling film absorption tower (6), the second-stage falling film absorption tower (7), and the third-stage falling film absorption tower (8) all have the same falling film absorption tower structure.

3. An ammonia recovery and processing device according to claim 2, characterized in that: The outer sides of the first-stage falling film absorption tower (6), the second-stage falling film absorption tower (7), and the third-stage falling film absorption tower (8) are all connected to a first circulating water pump (9).

4. The ammonia recovery and processing device according to claim 3, characterized in that: The ammonia water recovery module comprises a temporary storage tank (10), and the temporary storage tank (10) is provided at the center of the bottom of the first-stage falling film absorption tower (6), the second-stage falling film absorption tower (7), and the third-stage falling film absorption tower (8).

5. The ammonia recovery and processing device according to claim 4, characterized in that: The cooling heat exchange module comprises a cooling water inlet device (11) and a cooling water outlet device (12); the first-stage falling film absorption tower (6), the second-stage falling film absorption tower (7), and the third-stage falling film absorption tower (8) are respectively provided with a cooling water inlet device (11) and a cooling water outlet device (12) on both sides of their exteriors.

6. The ammonia recovery and processing device according to claim 5, characterized in that: The falling film absorption tower structure comprises an exhaust gas inlet (61), an exhaust gas outlet (62), a circulating water inlet (63), a circulating water outlet (64), a cooling water inlet (65), cooling tubes (66), a cooling water outlet (67), a first shell (68), and a supporting skirt (69); The waste gas inlet (61) is arranged at the top of the first shell (68), and the waste gas outlet (62) is arranged at a position close to the bottom of one side of the first shell (68), and the waste gas outlet (62) can be connected to the waste gas inlet (61) at the top of the first shell (68) of the adjacent falling film absorption tower through the first connecting air duct (2); The circulating water inlet (63) is arranged at a position close to the top of one side of the first shell (68), the circulating water outlet (64) is arranged at the bottom of the first shell (68), the water outlet of the first circulating water pump (9) is connected to the circulating water inlet (63) through a pipeline, the circulating water outlet (64) is communicated with the inlet of the temporary storage tank (10), and a corresponding valve member is arranged at the connection between the circulating water outlet (64) and the temporary storage tank (10), and the outlet of the temporary storage tank (10) is connected to the water inlet of the first circulating water pump (9); The cooling water inlet (65) is arranged at a position close to the bottom of one side of the first shell (68), the cooling water outlet (67) is arranged at a position close to the top of the other side of the first shell (68), the cooling tube (66) is arranged in the first shell (68), the cooling water inlet (65) is connected to the cooling water inlet device (11), and the cooling water outlet (67) is connected to the cooling water outlet device (12); The support skirt (69) is arranged near the middle of the first shell (68), and the support skirt (69) can play a supporting and limiting role in the installation of the first shell (68).

7. The ammonia recovery and processing device according to claim 1, characterized in that: The packed absorption tower module comprises a primary packed absorption tower (13) and a secondary packed absorption tower (14); the primary packed absorption tower (13) is an acid absorption tower, and the secondary packed absorption tower (14) is a water absorption tower; The first-stage packed absorption tower (13) and the second-stage packed absorption tower (14) both have the same packed absorption tower structure.

8. The ammonia recovery and processing device according to claim 7, characterized in that: The outer sides of the primary packed absorption tower (13) and the secondary packed absorption tower (14) are both connected to a second circulating water pump (15).

9. The ammonia recovery and processing device according to claim 8, characterized in that: The packed absorption tower structure comprises an air outlet (131), an air inlet (132), a packed demisting device (133), a packed absorption device, a second shell (134), a manhole sight glass (135), an overflow port (136), a liquid level gauge port (137), a drain port (138), a water replenishment port (139), a drug addition port (140), a circulating water tank (141), and a circulating water pump water inlet (142); An air outlet (131) is provided at the top of the second shell (134); an air inlet (132) is provided at a position near the bottom of one side of the second shell (134); the air outlet (131) of the first-stage packing absorption tower (13) can be connected to the air inlet (132) of the second-stage packing absorption tower (14) through the second connecting air duct (3); the air outlet (131) of the second-stage packing absorption tower (14) can be connected to the induced draft fan (5) in the exhaust pipe (1) through the second connecting air duct (3); The packing absorption device is arranged inside the second shell (134); a packing demister (133) is arranged between the packing absorption device and the air outlet (131), and the packing demister (133) adopts a Φ38 multi-faceted hollow ball; a plurality of manhole mirrors (135) for observing the situation inside the tower are arranged on the side of the second shell (134); A circulating water tank (141) is provided on one side of the second shell (134), and the bottom of the second shell (134) is in communication with the circulating water tank (141). A circulating water pump water inlet (142) is provided on the circulating water tank (141), and the circulating water tank (141) is connected to the second circulating water pump (15) via the circulating water pump water inlet (142). The circulating water tank (141) is also provided with a water replenishment port (139) for adding water and a drug addition port (140) for adding drugs. An overflow port (136), a liquid level gauge port (137), and a drain port (138) are provided on the outside of the second shell (134) near the bottom, and the drain port (138) is located below the overflow port (136).

10. The ammonia recovery and processing device according to claim 9, characterized in that: The filler absorption device comprises at least two filler absorption modules stacked one above the other, and the filler absorption module comprises a spray system (143), a filler layer (144), and a support plate (145) for supporting the filler layer (144); The spray system (143) is located above the packing layer (144), and a support plate (145) is provided below the packing layer (144); the packing layer (144) uses Φ50 polyhedral hollow balls; the spray system (143) includes a spray pipe and a plurality of spiral nozzles; The water outlet of the second circulating water pump (15) is in communication with the spray system (143).

Images