TWM479796U - Ammonia processing equipment - Google Patents

Description

Ammonia treatment equipment

The present invention relates to an exhaust gas treatment device, and more particularly to an ammonia gas treatment device which is suitable for treating exhaust gas containing a high concentration of ammonia gas, and is also suitable for treating exhaust gas containing a high concentration of ammonia gas and hydrogen gas.

The exhaust gas emitted by some factories contains a high concentration of ammonia gas. The common method for treating ammonia gas includes the absorption of ammonia gas in the tail gas by a sulfuric acid aqueous solution. This treatment requires a large amount of strong acid, and subsequent acid-base neutralization is required. There is also the problem of producing ammonia nitrogen wastewater.

Some people have tried to use a catalyst bed to react ammonia and oxygen into nitrogen and water. However, it has been considered that the catalyst method is not suitable for treating high-concentration ammonia-containing tail gas because the ammonia concentration in the tail gas is higher than the lower explosion limit, ammonia gas and The process of mixing air is prone to explosion. In addition, there may be high concentrations of hydrogen and explosives such as indium, gallium, and molybdenum in the exhaust gas. If the hydrogen is not controlled at the lower explosion limit, or if these explosive substances are not removed, it is easy to explode in the process of mixing air. . Therefore, how to improve the aforementioned problems is considered by those skilled in the art.

In view of this, the main purpose of this creation is to provide an ammonia treatment equipment that can be applied to the treatment of high concentration ammonia-containing tail gas.

In order to achieve the foregoing and other objects, the present invention provides an ammonia treatment apparatus including a first scrubber, a heater, a catalyst reactor, and a circulation line for washing the to-be-processed a gas for heating the gas to be treated, the catalyst reactor for oxidizing ammonia gas in the gas to be treated, the circulation line comprising a gas inlet to be treated, an oxygen inlet and a gas outlet, The gas inlet to be treated is for introducing a gas to be treated, and the oxygen inlet is for introducing oxygen, and the gas outlet is for discharging the gas to be treated in the partial circulation line. Wherein, the circulating pipeline is configured to sequentially circulate the gas to be treated through the inlet of the gas to be treated, The oxygen inlet, the heater, the catalyst reactor and the gas outlet, and the gas to be treated is washed through the first scrubber before being introduced into the circulation line.

Based on the previous design, since the gas to be treated is introduced into the circulation line, it is mixed with the catalyst-treated gas in the pipeline, so that the ammonia concentration in the gas to be treated can be diluted and kept at The lower limit of the explosion, no subsequent explosion when mixed with oxygen. In addition, the gas to be treated of the present invention is first washed through the first washing tower before entering the circulation pipeline, and the washing process can remove the dust and explosive substances in the gas, thereby increasing the safety of operation, and Avoid blocking the catalyst reactor.

10‧‧‧First Washing Tower

20‧‧‧heater

30‧‧‧catalyst reactor

40‧‧‧Circulation line

41‧‧‧ gas inlet to be treated

42‧‧‧Oxygen inlet

43‧‧‧ gas export

44‧‧‧First valve body

45‧‧‧Second body

50‧‧‧Adjustment slot

60‧‧‧First cooler

70‧‧‧Oxygen detector

80‧‧‧ controller

90‧‧‧Second cooler

100‧‧‧Second Washing Tower

Fig. 1 is a schematic view showing the composition of the first embodiment of the present creation.

Fig. 2 is a schematic view showing the composition of the second embodiment of the present creation.

Referring to FIG. 1 , in a first embodiment of the present invention, an ammonia treatment apparatus includes a first scrubber 10, a heater 20, a catalyst reactor 30, a circulation line 40, and an adjustment tank. 50. A first cooler 60, an oxygen detector 70, a controller 80, a second cooler 90, and a second scrubber 100.

The first washing tower 10 is used for washing the gas to be treated, and the dust in the gas to be treated and the explosive substances such as gallium, indium, molybdenum and the like may be washed out, and the washing liquid is repeatedly circulated in the tower without discharging the first washing. Tower 10, and for safety reasons, the first scrubber 10 is preferably scrubbed in an oxygen-free environment to prevent ammonia or explosive materials from exploding upon contact with oxygen. The gas to be treated treated by the first scrubber 10 contains ammonia gas, and may also contain hydrogen, nitrogen, and a small portion of water. After the gas to be treated is washed by the first scrubber 10, it is further introduced into the circulation line 40 for treatment.

Due to the exhaust gas generated by the factory at different times, the pressure and the ammonia concentration may vary considerably. Therefore, the gas to be treated may be introduced into the adjusting tank 50 to adjust the gas to be treated before entering the first washing tower 10. The pressure and ammonia concentration can be achieved by additional nitrogen addition. However, in the case where the pressure of the exhaust gas and the ammonia gas concentration change are not large, the adjustment groove 50 may be omitted.

The heater 20 is for heating the gas to be treated, which may be, but not limited to, a pyroelectric or fuel heater, and the temperature of the gas to be treated is raised to a temperature suitable for the catalyst reaction.

On the other hand, the temperature of the gas to be treated should not be too high, otherwise harmful by-products may be generated when the gas to be treated undergoes a catalyst reaction, so when the temperature of the gas to be treated is too high, the first cooler can be used. The cooling is performed 60, which may be, but not limited to, a water-cooled chiller.

The catalyst reactor 30 is for oxidizing ammonia gas in the gas to be treated, and the catalyst in the catalyst reactor 30 may be, but not limited to, ruthenium, aluminum, ruthenium, copper, nickel, zirconium, silver, palladium, An inorganic material such as platinum, rhodium or its oxide, and mainly ammonia gas is reacted into nitrogen and water. Where the gas to be treated contains hydrogen, hydrogen may also be oxidized to water by the catalyst reactor 30. In other words, the inventive processing apparatus can also be used to treat plant exhaust gas containing both high concentration ammonia and high concentration hydrogen.

Since both oxygen and hydrogen are required to oxidize, it is possible to further detect whether there is sufficient oxygen in the circulation line 40. In this embodiment, the ammonia gas treatment device is further provided with an oxygen detector 70 for detecting the oxygen concentration, partial pressure or flow rate in the circulation line 40.

The circulation line 40 includes a gas inlet 41 to be treated, an oxygen inlet 42 and a gas outlet 43 for introducing a gas to be treated, the oxygen inlet 42 is for introducing oxygen, and the gas outlet 43 is The gas to be treated in the partial circulation line is derived. It should be noted that since the air contains oxygen, the oxygen inlet 42 can be directly introduced into the air, that is, the oxygen required for the oxidation of the ammonia gas can be supplied in the circulation line 40, the intake amount of the oxygen inlet 42 and the gas outlet 43 can be The amount of exhaust gas can be adjusted by the first and second valve bodies 44, 45, respectively.

As described above, after the gas to be treated is washed by the first washing column 10, it is introduced into the circulation line 40, and the circulation line 40 sequentially circulates the gas to be treated through the gas inlet 41 to be treated, the oxygen inlet 42, The first cooler 60, the heater 20, the catalyst reactor 30, the oxygen detector 70 and the gas outlet 43, a portion of the gas to be treated is discharged at the gas outlet 43, and the remainder continues to circulate according to the aforementioned path.

It should be noted that since the first cooler 60 and the heater 20 are selected in principle, the position of the first cooler 60 is only required to be between the oxygen inlet 42 and the catalyst reactor 30, so the first The sequence of cooler 60 and heater 20 can be reversed. In addition, the oxygen detector 70 is for assisting in determining the oxygen demand when the ammonia gas is oxidized, so as long as the gas to be treated is circulated. In the path, the oxygen detector 70 may be disposed between the catalyst reactor 20 and the oxygen inlet 42 and does not have to be disposed before the gas outlet 43. Moreover, in order to control the amount of oxygen supplied by the oxygen inlet 42, the controller 80 can be implemented. The controller 80 can receive the oxygen concentration signal of the oxygen detector 70, and control the first valve body 44 according to the obtained signal. The oxygen introduction amount of the oxygen inlet 42 is adjusted.

After the gas to be treated leaves the circulation pipeline, it may be at a higher temperature, and the second cooler 90 may be used for cooling; in order to avoid ammonia remaining in the gas to be treated, the second cooler 90 may also be used. The cooled gas to be treated is introduced into the second scrubber 100, and the scrubbing liquid of the second scrubber 100 absorbs ammonia gas which may remain in the gas to be treated.

Referring to FIG. 2, after the gas to be treated is treated by the catalytic reactor 30, the gas to be treated 41 and the oxygen inlet 42 are sequentially passed through to further supplement the gas to be treated and oxygen/air, and the whole of the gas to be treated at this time. The temperature is lowered, so there is no need to cool down, so in the second embodiment of the present creation, the first cooler can be omitted. In addition, after the gas to be treated is treated by the catalytic reactor 30, most of the ammonia gas is converted into nitrogen gas and water, so that the gas to be treated discharged through the gas outlet 43 can no longer pass through the second cooler. The second scrubber is subjected to subsequent processing.

In other possible embodiments, as long as the oxygen inlet 42 continuously introduces excess oxygen, the ammonia gas can be oxidized in the catalyst reactor 30, so the oxygen detector 70 and the controller 80 can also be omitted. Only the gas inlet 41 to be treated, the oxygen inlet 42, the heater 20, the catalyst reactor 30, and the gas outlet 43 are sequentially flowed through the circulation line 40.

Based on the above description, the ammonia treatment device of the present invention removes the explosive substances in the gas to be treated by the first washing tower, and by the design of the circulation pipeline, the gas to be treated enters the circulation pipeline, and the circulation pipeline The other gases in the mixture are mixed. At this time, even if the plant exhaust gas contains a high concentration of ammonia gas, the ammonia gas can be diluted when it enters the circulation line, so that the concentration is lowered below the lower explosion limit, and then the oxygen inlet can be safely connected. The introduced oxygen/air mixture does not cause an explosion, which improves the overall safety.

In addition, another feature of this creation is that the ammonia-containing wastewater will not be discharged to the outside during the treatment, and the ammonia gas will be converted into nitrogen and water and then discharged to the outside, so that it can meet the requirements of environmental protection regulations.

Finally, it must be stated that the constituent elements disclosed in the foregoing embodiments are merely illustrative and are not intended to limit the scope of the present invention. Alternatives or variations of other equivalent elements should also be applied for in this case. Covered by the scope.

10‧‧‧First Washing Tower

20‧‧‧heater

30‧‧‧catalyst reactor

40‧‧‧Circulation line

41‧‧‧ gas inlet to be treated

42‧‧‧Oxygen inlet

43‧‧‧ gas export

44‧‧‧First valve body

45‧‧‧Second body

50‧‧‧Adjustment slot

60‧‧‧First cooler

70‧‧‧Oxygen detector

80‧‧‧ controller

90‧‧‧Second cooler

100‧‧‧Second Washing Tower

Claims (10)

An ammonia treatment apparatus comprising: a first washing tower for washing a gas to be treated; a heater for heating the gas to be treated; and a catalyst reactor for oxidizing ammonia gas in the gas to be treated; a circulation line comprising a gas inlet to be treated, an oxygen inlet and a gas outlet, wherein the gas inlet to be treated is for introducing a gas to be treated, the oxygen inlet is for introducing oxygen, and the gas outlet is for exporting a partial circulation pipeline The gas to be treated; wherein the circulation pipeline sequentially circulates the gas to be treated through the inlet of the gas to be treated, the oxygen inlet, the heater, the catalyst reactor and the gas outlet; wherein The process gas is first washed through the first scrubber before being introduced into the recycle line. The ammonia gas treatment device of claim 1, further comprising an adjustment tank, wherein the gas to be treated is first introduced into the adjustment tank before entering the first scrubber to adjust the pressure of the gas to be treated. The ammonia gas treatment device according to claim 1, further comprising a first cooler, and in the path of the gas to be treated, the first cooler is located between the oxygen inlet and the catalytic reactor for cooling Gas to be treated. The ammonia gas treatment device according to claim 1, further comprising a second cooler, wherein the gas to be treated is discharged from the circulation line by the gas outlet and then introduced into the second cooler for cooling. The ammonia gas treatment device according to claim 4, further comprising a second washing tower for introducing the gas to be treated cooled by the second cooler. The ammonia gas treatment device according to any one of claims 1 to 5, further comprising an oxygen detector, and in the path of the gas to be treated, the oxygen detector is located at the catalyst reactor and the oxygen inlet between. The ammonia gas treatment device of claim 6, further comprising a controller for receiving the signal of the oxygen detector, and adjusting the oxygen introduction amount of the oxygen inlet according to the obtained signal. The ammonia gas treatment apparatus according to any one of claims 1 to 5, wherein the first scrubber is for washing the gas to be treated in an oxygen-free environment. The ammonia gas treatment device of claim 6, wherein the first scrubber is for washing the gas to be treated in an oxygen-free environment. The ammonia treatment device of claim 9, further comprising a controller for receiving the signal of the oxygen detector, and adjusting the oxygen introduction amount of the oxygen inlet according to the obtained signal.