Ammonia-containing gas absorption treatment device

Abstract

The utility model provides an ammonia-containing gas absorption treatment device which mainly comprises an ammonia-containing gas conveying pipeline, an acid solution conveying pipeline, a sealing tank, a liquid level meter, a membrane assembly, a circulating pump, a pH detector, an emptying pipeline and an ammonia nitrogen detector. The gas is fully mixed with an acid solution in the tank to generate a neutralization reaction, so that ammonia in the gas is removed, the gas is emptied after reaching the standard through detection of an ammonia nitrogen detector, the solution in the sealed tank is circularly and uniformly mixed through a circulating pump, the pH of the solution is more uniform, and the circulating solution is discharged for reuse after reaching a pH set value. The membrane component is used as the gas distributor, so that the ammonia-containing gas is diffused more uniformly, the absorption efficiency of the acid solution is higher, the membrane component is connected with the sealing tank and the ammonia-containing gas conveying pipeline through the flanges, the replacement is easy, the operation and maintenance cost is low, and the ammonia-containing gas treatment device can be applied to various ammonia-containing gas treatment occasions and can also be used for adjusting the pH value of the acid ammonium salt solution.

Description

TECHNICAL FIELD

[0001] The utility model belongs to ammonia gas absorption treatment equipment field, specifically, it is a kind of ammonia gas absorption treatment device. BACKGROUND

[0002] In ammonia synthesis, ammonia gas or ammonia water and liquid ammonia application, high concentration ammonia nitrogen wastewater treatment and other processes, a large amount of ammonia-containing tail gas will be produced, ammonia gas is a toxic and irritating gas, which poses a serious threat to the environment and human health, so it needs to be effectively treated to meet the emission standards.

[0003] In chemical industry, non-ferrous metal smelting, steel and other industries, ammonia-containing tail gas is often absorbed by absorption tower combined with dilute sulfuric acid solution, the absorption tower is equipped with a spray device, a packing layer or a gas distributor, ammonia-containing tail gas is pretreated by cooling, dust removal and oil removal, and then enters the absorption tower from the bottom, and diffuses upward through the packing layer or gas distributor, sulfuric acid absorption liquid enters the absorption tower from the upper part and flows downward through the spray device, and the two meet and react quickly to generate ammonium sulfate solution, which is discharged from the bottom of the absorption tower, and the ammonia-free tail gas is discharged from the top of the absorption tower.

[0004] This equipment has simple structure and relatively stable operation, but there are problems of uneven diffusion of ammonia gas in the absorption tower and incomplete absorption. In order to improve the absorption efficiency of ammonia gas and ensure that the ammonia content in the discharged gas meets the standard, it is necessary to increase the height of the absorption tower, improve the concentration of the absorption liquid or implement the circulating absorption operation. In addition, the installation and maintenance cost of the absorption tower is high, the operation cost is also high, and the occupied area is large, and with the passage of time, its sealing performance will gradually decrease, thereby affecting the use.

[0005] Therefore, the utility model provides an ammonia gas absorption treatment device to solve the above problems. CONTENT OF UTILITY MODEL

[0006] In order to solve the above technical problems, the utility model provides the following technical scheme:

[0007] The utility model relates to an ammonia-containing gas absorption treatment device, which comprises an acid solution conveying pipeline, an acid liquid electromagnetic valve, an ammonia-containing gas conveying pipeline, an ammonia gas electromagnetic valve, a liquid level meter, a membrane module, a sealed tank, a circulating pump, a liquid circulating electromagnetic valve, an external discharge electromagnetic valve, a pH detector, a emptying pipeline, an ammonia nitrogen detector, a gas circulating electromagnetic valve and an emptying electromagnetic valve, the membrane module is an ammonia-containing gas distributor, and the membrane module comprises a connecting flange, a membrane wire and an adhesive.

[0008] Further, in the utility model, the acid solution conveying pipeline is provided with the acid liquid electromagnetic valve, and an acid liquid outlet end of the acid liquid electromagnetic valve is communicated with an acid liquid inlet end of the sealed tank.

[0009] Further, in the utility model, the ammonia-containing gas conveying pipeline is provided with the ammonia gas electromagnetic valve, and a gas outlet end of the ammonia gas electromagnetic valve is communicated with a gas inlet end of the membrane module through the connecting flange.

[0010] Further, in the utility model, a monitoring end of the liquid level meter is located in the inner cavity of the sealed tank.

[0011] Further, in the utility model, the connecting flange comprises a first flange and a second flange, and the first flange and the second flange are connected through a straight pipe.

[0012] Further, in the utility model, one end of the membrane module extends to the inner cavity of the sealed tank and is connected with the sealed tank through the second flange, and the other end of the membrane module is the gas inlet end and is connected with the ammonia-containing gas conveying pipeline through the first flange.

[0013] Further, in the utility model, the membrane module is made of a hollow fiber membrane, and the hollow fiber membrane is a hydrophobic microporous membrane.

[0014] Further, in the utility model, the membrane module is a hollow fiber U-shaped membrane module, one end of which is in a U shape in the inner cavity of the sealed tank, and the other end is the gas inlet end, and the membrane wire and the connecting flange are bonded to be made through the adhesive.

[0015] Further, in the utility model, the length of the membrane module in the inner cavity of the sealed tank exceeds the radius of the sealed tank.

[0016] Further, the ammonia-containing gas absorption treatment device can be used for pH adjustment of the acidic ammonium salt solution.

[0017] Beneficial effects, the utility model has following beneficial effects:

[0018] The utility model discloses a ammonia-containing gas conveying pipeline, ammonia gas solenoid valve, acid solution conveying pipeline, acid liquor solenoid valve, sealed jar, liquid level meter, membrane module, circulating pump, liquid circulation solenoid valve, external discharge solenoid valve, pH detection meter, emptying pipeline, emptying solenoid valve, gas circulation solenoid valve and ammonia nitrogen detection meter are set up, and the effect that ammonia-containing gas is carried out high -efficient absorption treatment is achieved. By adopting membrane module instead of traditional gas distributor, ammonia-containing gas diffusion is more uniform, and the absorption efficiency of acidic solution is higher;Membrane module has dust removal and oil removal filtering function, makes the ammonia-containing gas that enters sealed jar more pure, and reduces equipment investment and land occupation;Membrane module is connected through flange with sealed jar and ammonia-containing gas conveying pipeline, and is easy to replace and maintain;Adopt sealed jar instead of traditional absorption tower, so that installation, application are more convenient, and the sealing performance is good, and the operation and maintenance cost are low, can be applied to various ammonia-containing gas processing occasions, also can be used for pH adjustment of acidic ammonium salt solution. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 It is the working process schematic diagram of the utility model;

[0020] Fig. 2 It is the connection state structure schematic diagram of membrane module, ammonia-containing gas and sealed jar of the utility model;

[0021] Fig. 3 It is the structure schematic diagram of membrane module of the utility model.

[0022] In the drawing:

[0023] 1, acid solution conveying pipeline;2, acid liquor solenoid valve;3, ammonia-containing gas conveying pipeline;4, ammonia gas solenoid valve;5, liquid level meter;6, membrane module;61, connecting flange;611, first flange;612, second flange;62, membrane wire;63, adhesive;7, sealed jar;8, circulating pump;9, liquid circulation solenoid valve;10, external discharge solenoid valve;11, pH detection meter;12, emptying pipeline;13, ammonia nitrogen detection meter;14, gas circulation solenoid valve;15, emptying solenoid valve. DETAILED DESCRIPTION

[0024] For a better understanding of the technical content of the present application, specific embodiments are described below with the accompanying drawings. In the present disclosure, various aspects of the present application are described with reference to the accompanying drawings, which show many embodiments of the description. The embodiments of the present disclosure are not necessarily defined in all aspects including the present application. It should be understood that the various concepts and embodiments introduced above, as well as those described in more detail below, can be implemented in any of a number of ways, as the concepts and embodiments disclosed in the present application are not limited to any implementation. In addition, some aspects of the present application can be used alone or in any appropriate combination with other aspects of the present application.

[0025] Embodiment 1

[0026] As Figs. 1-3 shown, the first embodiment of the present application provides a kind of ammonia-containing gas absorption treatment device, including acid solution delivery pipeline 1, acid liquid electromagnetic valve 2, ammonia-containing gas delivery pipeline 3, ammonia gas electromagnetic valve 4, liquid level meter 5, membrane module 6, sealed tank 7, circulating pump 8, liquid circulating electromagnetic valve 9, discharge electromagnetic valve 10, pH detection meter 11, emptying pipeline 12, ammonia nitrogen detection meter 13, gas circulating electromagnetic valve 14 and emptying electromagnetic valve 15, membrane module 6 is ammonia-containing gas distributor, membrane module 6 includes connecting flange 61, membrane silk 62 and adhesive 63, liquid level meter 5 is installed in the inner cavity of sealed tank 7, the liquid inlet end of circulating pump 8 is communicated with the liquid outlet end of sealed tank 7, the liquid outlet end of circulating pump 8 is communicated with liquid circulating electromagnetic valve 9, discharge electromagnetic valve 10 and pH detection meter 11 respectively, liquid circulating electromagnetic valve 9 is communicated with the liquid inlet end of sealed tank 7, emptying pipeline 12 is set at the top of sealed tank 7, and the gas outlet end of emptying pipeline 12 is communicated with ammonia nitrogen detection meter 13, gas circulating electromagnetic valve 14 and emptying electromagnetic valve 15 respectively, gas circulating electromagnetic valve 14 is communicated with the gas inlet end of membrane module 6.

[0027] As Figs. 1-3As shown, the acid solution enters the sealed tank 7 through the acid solution conveying pipeline 1 and the acid solution electromagnetic valve 2, the liquid level meter 5 monitors the liquid level of the sealed tank 7, the acid solution electromagnetic valve 2 is closed when reaching the set liquid level value, the acid solution conveying is stopped, then the exhaust electromagnetic valve 10 is closed, the liquid circulation electromagnetic valve 9 is opened, the circulating pump 8 starts to circulate, the solution in the inner cavity of the sealed tank 7 enters the circulating pipeline, then enters the sealed tank 7 through the liquid circulation electromagnetic valve 9, the pH detector 11 detects the pH value of the solution, the circulating operation makes the solution mixing more uniform and the pH detection value more accurate. The ammonia-containing gas enters the membrane module 6 connected to the lower end of the sealed tank 7 through the ammonia-containing gas conveying pipeline 3 and the ammonia gas electromagnetic valve 4, diffuses into the sealed tank 7 in countless fine bubbles through the micropores of the membrane wire 62, and the ammonia component in the gas encounters the acid solution and reacts rapidly to be absorbed. The gas continues to diffuse upwards into the exhaust pipeline 12, when the ammonia nitrogen detector 13 shows that the ammonia nitrogen content in the gas meets the standard, the exhaust electromagnetic valve 15 is opened, the gas circulation electromagnetic valve 14 is closed, and the qualified ammonia gas is exhausted; if the ammonia nitrogen detector 13 shows that the ammonia nitrogen content in the gas does not meet the standard, the gas circulation electromagnetic valve 14 is opened, the exhaust electromagnetic valve 15 is closed, and the unqualified ammonia gas is absorbed by the acid solution in the sealed tank 7 through the membrane module 6 and the ammonia-containing gas conveying pipeline 3. When the acid in the acid solution in the sealed tank 7 is gradually converted into the corresponding ammonium salt, the ammonia gas electromagnetic valve 4 and the gas circulation electromagnetic valve 14 are closed in turn after the circulating solution reaches the set pH value, the input of the ammonia-containing gas is stopped, the exhaust electromagnetic valve 15 is opened, the exhaust electromagnetic valve 10 is opened, the liquid circulation electromagnetic valve 9 is closed, and the solution after the pH value meets the standard is exhausted for further treatment. When the liquid level meter 5 monitors that the liquid level of the sealed tank 7 reaches the low liquid level, the liquid circulation electromagnetic valve 9 is opened, the exhaust electromagnetic valve 10 is closed, and the circulating pump 8 is closed, and the operation is ended. By using the membrane module 6 to replace the traditional gas distributor, the ammonia gas diffusion is more uniform, the absorption efficiency of the acid solution is higher, the membrane module 6 is connected with the sealed tank 7 and the ammonia-containing gas conveying system through flanges, and is easy to replace and maintain; by using the sealed tank 7 to replace the traditional absorption tower, the installation and application are more convenient, the sealing performance is good, the operation and maintenance cost is low, and the sealed tank 7 can be applied to various ammonia-containing gas occasions.

[0028] Example 2

[0029] Reference Figs. 1-3 , the second embodiment of the utility model, the embodiment is based on the previous embodiment.

[0030] The acid solution delivery pipeline 1 is provided with an acid liquid electromagnetic valve 2, and the acid liquid outlet end of the acid liquid electromagnetic valve 2 is communicated with the acid liquid inlet end of the sealed tank 7. The ammonia gas delivery pipeline 3 is provided with an ammonia gas electromagnetic valve 4, and the gas outlet end of the ammonia gas electromagnetic valve 4 is communicated with the gas inlet end of the membrane module 6 through a connecting flange 61. The monitoring end of the liquid level meter 5 is located in the inner cavity of the sealed tank 7. The connecting flange 61 comprises a first flange 611 and a second flange 612, and the first flange 611 and the second flange 612 are connected by a straight pipe. One end of the membrane module 6 extends into the inner cavity of the sealed tank 7 and is connected with the sealed tank 7 through the second flange 612, and the other end of the membrane module 6 is the gas inlet end and is connected with the ammonia gas delivery pipeline 3 through the first flange 611.

[0031] The membrane module 6 is made of hollow fiber membrane, and the hollow fiber membrane is a hydrophobic microporous membrane. The membrane module 6 is a hollow fiber U-shaped membrane module, and one end thereof located in the inner cavity of the sealed tank 7 is in a U shape, and the other end thereof is the gas inlet end and is made by bonding the membrane wire 62 and the connecting flange 61 with an adhesive 63. The length of the membrane module 6 in the inner cavity of the sealed tank 7 exceeds the radius of the sealed tank 7.

[0032] As shown in Figs. 1-3 The first flange 611 is composed of a flange sheet 611A and a flange sheet 611B, and the second flange 612 is composed of a flange sheet 612A and a flange sheet 612B. The flange sheet 611A is the gas outlet end flange sheet of the ammonia gas delivery pipeline 3, the flange sheet 611B is the flange sheet of the gas inlet end of the membrane module 6, the flange sheet 612A is the flange sheet of the gas inlet end of the membrane module 6, and the flange sheet 612B is the flange sheet of the gas inlet end of the sealed tank 7. The flange sheet 611B and the flange sheet 612A are connected by a straight pipe, the membrane wire 62 passes through the straight pipe, and the adhesive 63 fixes the membrane wire 62 in the flange and the connecting straight pipe at the end of the flange sheet 611B to make the membrane module 6. The membrane module 6 is connected with the ammonia gas delivery pipeline 3 through the flange sheet 611A and the flange sheet 611B, and is connected with the sealed tank 7 through the flange sheet 612A and the flange sheet 612B. The membrane wire 62 used in the membrane module 6 is a hydrophobic microporous membrane and has dust and oil removal filtering function, so that the ammonia gas entering the sealed tank 7 is more pure, and the obtained ammonium salt solution has higher quality; the porosity of the membrane wire 62 is greater than 30%, which has good air permeability and water impermeability and high strength. The ammonia gas enters the membrane wire tube from the opening end of the membrane wire 62, passes through the membrane wall micropores to become countless fine bubbles, and rapidly reacts with the acid solution in the sealed tank 7. The gas after ammonia removal continues to diffuse upward into the emptying pipeline 12, is detected by the ammonia nitrogen detection meter 13, and is discharged after passing the detection. When the liquid level meter 5 detects that the solution reaches a high liquid level, the acid liquid electromagnetic valve 2 is closed, and the circulating pump 8 stops running when the liquid level is low.

[0033] In use, the acid solution enters the sealed tank 7 through the acid solution delivery pipeline 1 and the acid solution electromagnetic valve 2, the inlet of the circulating pump 8 is connected with the sealed tank 7, the outlet of the circulating pump 8 is connected with the liquid circulating electromagnetic valve 9, and the liquid circulating electromagnetic valve 9 is connected with the sealed tank 7. When the solution enters the sealed tank 7, the liquid level meter 5 monitors the solution level in the sealed tank 7, when reaching a certain liquid level, the acid solution electromagnetic valve 2 is closed, and the acid solution stops being punched in; the liquid circulating electromagnetic valve 9 is in an open state, the circulating pump 8 is started, and the solution is circulated in the sealed tank 7 and the pipeline, the pH detection meter 11 is connected with the outlet pipeline of the circulating pump 8, and the pH value of the circulating solution is detected. The gas outlet end of the ammonia gas electromagnetic valve 4 is connected with the flange sheet 611A, connected with the membrane assembly 6 through the flange sheet 611B, the flange sheet 612A at the other end of the membrane assembly 6 is connected with the flange sheet 612B at the lower position of the sealed tank 7, and the U-shaped end of the membrane wire 62 is placed in the sealed tank 7. The ammonia gas electromagnetic valve 4 is opened, the ammonia-containing gas enters the sealed tank 7 through the ammonia-containing gas delivery pipeline 3 and the membrane assembly 6 and reacts with the acid solution to generate an ammonium salt solution, so that the ammonia in the gas is removed. After the ammonia is removed, the gas continues to diffuse upwards into the exhaust pipeline 12, after the ammonia nitrogen detection meter 13 detects that the ammonia nitrogen content in the gas meets the standard, the exhaust electromagnetic valve 15 is opened, the gas circulating electromagnetic valve 14 is closed, and the qualified ammonia gas is exhausted; if the ammonia nitrogen detection meter 13 shows that the ammonia nitrogen content in the gas does not meet the standard, the gas circulating electromagnetic valve 14 is opened, the exhaust electromagnetic valve 15 is closed, and the unqualified ammonia gas returns to the ammonia-containing gas delivery pipeline 3 and then enters the sealed tank 7 through the membrane assembly 6 and is further absorbed by the acid solution. One end of the exhaust electromagnetic valve 10 is connected with the circulating pump 8, the other end is connected with the exhaust pipeline, when the pH detection meter 11 detects that the circulating solution in the sealed tank 7 reaches the pH set value, the ammonia gas electromagnetic valve 4 is closed, the ammonia-containing gas input into the sealed tank 7 is stopped, the exhaust electromagnetic valve 15 is opened, the gas circulating electromagnetic valve 14 is closed, the exhaust electromagnetic valve 10 is opened, the liquid circulating electromagnetic valve 9 is closed, and the pH-qualified solution is exhausted for further treatment and reuse.

[0034] Example 3

[0035] Reference Figs. 1-3 , the third embodiment of the utility model is based on the previous embodiment.

[0036] In the embodiment, the ammonia-containing gas absorption treatment device can be used for pH adjustment of an acidic ammonium salt solution, the acidic solution is an acidic ammonium salt solution produced in the process of treating ammonia-containing wastewater or feed liquid, the ammonia-containing gas is used for adjusting the acidic ammonium salt solution to neutral, according to the ammonia concentration of the ammonia-containing gas, the gas flux, the ammonia concentration limit of the exhaust gas and the pH of the acidic ammonium salt solution, the number and length of the membrane filaments 62 of the membrane module 6 are adjusted, so that the contact area of the ammonia-containing gas with the acidic solution in the sealed tank 7 is optimized, the neutralization reaction effect is improved, and the amount of ammonia-qualified exhaust gas is improved. When the pH detector 11 detects that the pH value of the circulating solution in the sealed tank 7 reaches the set qualified value, the ammonia gas solenoid valve 4 is closed, the ammonia gas input into the sealed tank 7 is stopped, the exhaust solenoid valve 15 is opened, the gas circulation solenoid valve 14 is closed, the exhaust solenoid valve 10 is opened, the liquid circulation solenoid valve 9 is closed, and the solution with adjusted pH is discharged through the exhaust solenoid valve 10 for further treatment and recycling. After the solution is discharged, the liquid circulation solenoid valve 9 is opened, the exhaust solenoid valve 10 is closed, and the circulating pump 8 stops running. The membrane filaments 62 used in the membrane module 6 are hydrophobic microporous membranes, which have dust and oil removal filtering functions, so that the ammonia-containing gas entering the sealed tank 7 is more pure, the obtained ammonium salt solution has higher quality, and is beneficial to further recycling.

[0037] The standard parts used in the present application can be purchased from the market, and can be customized according to the description and drawings. The specific connection mode of each part adopts the conventional means such as bolts, rivets and welding in the prior art. The mechanical parts and devices adopt conventional types in the prior art. The control mode is automatically controlled by a controller. The control circuit of the controller can be realized by simple programming of a person skilled in the art. It is common knowledge in the art. The present application is mainly used to protect mechanical devices, so the control mode and circuit connection will not be explained in detail.

[0038] Although the present application has been disclosed with the above preferred embodiments, it is not intended to limit the present application. Those skilled in the art can make various modifications and improvements without departing from the spirit and scope of the present application. Therefore, the protection scope of the present application is defined by the claims.

Claims

1. An ammonia-containing gas absorption treatment device comprising an acid solution delivery pipe (1), an acid solution solenoid valve (2), an ammonia-containing gas delivery pipe (3), an ammonia gas solenoid valve (4), a liquid level meter (5), a membrane module (6), a sealed tank (7), a circulating pump (8), a liquid circulating solenoid valve (9), an external discharge solenoid valve (10), a pH detector (11), a discharge pipe (12), an ammonia nitrogen detector (13), a gas circulating solenoid valve (14), and a discharge solenoid valve (15), characterized in that: The membrane assembly (6) is an ammonia-containing gas distributor, the membrane assembly (6) comprises a connecting flange (61), a membrane filament (62) and an adhesive (63), the liquid level meter (5) is installed in the inner cavity of the sealed tank (7), the liquid inlet end of the circulating pump (8) is communicated with the liquid outlet end of the sealed tank (7), the liquid outlet end of the circulating pump (8) is communicated with the liquid circulating electromagnetic valve (9), the external discharge electromagnetic valve (10) and the pH detector (11) respectively, the liquid circulating electromagnetic valve (9) is communicated with the liquid inlet end of the sealed tank (7), the emptying pipeline (12) is arranged at the top of the sealed tank (7), and the gas outlet end of the emptying pipeline (12) is communicated with the ammonia and nitrogen detector (13), the gas circulating electromagnetic valve (14) and the emptying electromagnetic valve (15) respectively, and the gas circulating electromagnetic valve (14) is communicated with the gas inlet end of the membrane assembly (6).

2. The ammonia gas absorbing treatment device according to claim 1, wherein: The acid solution conveying pipeline (1) is provided with an acid liquid electromagnetic valve (2), and the acid liquid outlet end of the acid liquid electromagnetic valve (2) is communicated with the acid liquid inlet end of the sealed tank (7).

3. The ammonia gas absorbing treatment apparatus according to claim 1, wherein: The ammonia-containing gas conveying pipeline (3) is provided with an ammonia gas electromagnetic valve (4), and the gas outlet end of the ammonia gas electromagnetic valve (4) is communicated with the gas inlet end of the membrane assembly (6) through the connecting flange (61).

4. The ammonia gas absorbing treatment apparatus according to claim 1, wherein: The monitoring end of the liquid level meter (5) is located in the inner cavity of the sealed tank (7).

5. The ammonia gas absorbing treatment apparatus according to claim 1, wherein: The connecting flange (61) comprises a first flange (611) and a second flange (612), and the first flange (611) and the second flange (612) are connected through a straight pipe.

6. The ammonia gas absorbing treatment device according to claim 1, wherein: One end of the membrane assembly (6) extends into the inner cavity of the sealed tank (7) and is connected with the sealed tank (7) through the second flange (612), and the other end of the membrane assembly (6) is a gas inlet end and is connected with the ammonia-containing gas conveying pipeline (3) through the first flange (611).

7. The ammonia gas absorbing treatment apparatus according to claim 1, wherein: The membrane assembly (6) is made of a hollow fiber membrane, and the hollow fiber membrane is a hydrophobic microporous membrane.

8. The ammonia gas absorbing treatment apparatus according to claim 1, wherein: The membrane assembly (6) is a hollow fiber U-shaped membrane assembly, and one end in the inner cavity of the sealed tank (7) is in a U shape, and the other end is a gas inlet end, and the membrane filament (62) and the connecting flange (61) are bonded by the adhesive (63).

9. The ammonia gas absorbing treatment apparatus according to claim 1, wherein: The length of the membrane assembly (6) in the inner cavity of the sealed tank (7) exceeds the radius of the sealed tank (7).

10. The ammonia gas absorbing treatment apparatus according to claim 1, wherein: The ammonia-containing gas absorption treatment device can be used for pH adjustment of an acidic ammonium salt solution.

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