Tail gas treatment device for dilute nitric acid production

Abstract

The utility model relates to the technical field of dilute nitric acid production, and discloses a tail gas treatment device for dilute nitric acid production, which comprises a main body mechanism, a purifying mechanism and a filtering mechanism, the purifying mechanism is located at the inner end of the main body mechanism, the filtering mechanism is located at the upper end of the purifying mechanism, and the main body mechanism comprises a purifying box, a filtering box and an exhaust pipe. The filter box is fixedly mounted at the right end of the upper end of the purification box, and the exhaust pipe is fixedly mounted at the upper end of the filter box; the main body mechanism further comprises a gas detector, a first electromagnetic valve, a recovery pipe and a second electromagnetic valve, the gas detector is fixedly installed at the inner end of the exhaust pipe, the first electromagnetic valve is fixedly installed at the upper end of the outer end of the exhaust pipe, and the recovery pipe is fixedly installed at the right end of the exhaust pipe. According to the tail gas treatment device for dilute nitric acid production, by installing the main body mechanism, the discharged nitric acid tail gas can be conveniently detected, the nitric acid tail gas can be conveniently treated for multiple times, the safety is improved, and the practicability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of dilute nitric acid production, in particular to a tail gas treatment device for dilute nitric acid production. Background Art

[0002] Nitric acid is a monobasic inorganic strong acid with strong oxidizing and corrosive properties. It is one of the six major inorganic strong acids and an important chemical raw material. It is mainly used to manufacture ammonium nitrate, calcium ammonium nitrate, nitrophosphate fertilizer, nitrogen-phosphorus-potassium and other compound fertilizers. The production of dilute nitric acid will produce a certain amount of tail gas, so a nitric acid tail gas treatment device is required.

[0003] The prior art patent document with announcement number CN218530451U discloses a nitric acid tail gas treatment device, including a shell, a reaction part and a guide tube body, the top of the shell is provided with a first air inlet end, and the side thereof is provided with a first exhaust end; the reaction part is arranged in the shell, and includes a first support frame, a first catalytic layer, a second support frame, and a second catalytic layer, the end of the first support frame is connected to the inner wall of the shell, the first catalytic layer is arranged on the first support frame, the end of the second support frame is connected to the inner wall of the shell, and the second catalytic layer is arranged on the second support frame; the guide tube body is arranged in the shell, one end of which is provided with a second air inlet end, and the second air inlet end is located below the reaction part, and the other end of the guide tube body is provided with a second exhaust end, and the second exhaust end is located above the second air inlet end and connected to the first exhaust end; the utility model can effectively avoid the catalyst from moving and rubbing in the gap due to the airflow direction, thereby improving the use efficiency and life of the catalyst.

[0004] However, after the nitric acid tail gas is treated in the prior art CN218530451U patent, it is not convenient to detect the discharged nitric acid tail gas, and the nitric acid tail gas may be unqualified. It is not convenient to treat the nitric acid tail gas multiple times, which reduces safety and has low practicality. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] The utility model aims to provide a tail gas treatment device for the production of dilute nitric acid, so as to solve the problem in the above background technology that it is inconvenient to detect the discharged nitric acid tail gas.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a tail gas treatment device for dilute nitric acid production, comprising a main body mechanism, a purification mechanism and a filtering mechanism, wherein the purification mechanism is located at the inner end of the main body mechanism, and the filtering mechanism is located at the upper end of the purification mechanism, and the main body mechanism comprises a purification box, a filtering box and an exhaust pipe, wherein the filtering box is fixedly mounted at the right end of the upper end of the purification box, and the exhaust pipe is fixedly mounted at the upper end of the filtering box;

[0009] The main structure also includes a gas detector, a solenoid valve 1, a recovery pipe and a solenoid valve 2. The gas detector is fixedly installed at the inner end of the exhaust pipe, the solenoid valve 1 is fixedly installed at the upper end of the outer end of the exhaust pipe, the recovery pipe is fixedly installed at the right end of the exhaust pipe, the recovery pipe extends to the interior of the purification box, and the solenoid valve 2 is fixedly installed at the outer end of the recovery pipe.

[0010] Preferably, the purification mechanism includes an air intake pipe, an air intake valve, a water pump, a connecting pipe, a mounting rod, an atomizing nozzle, a feeding port, a movable plug, a drain pipe and a drain valve. The air intake pipe is fixedly installed at the upper end of the left end of the purification box, and the air intake valve is fixedly installed at the outer end of the air intake pipe to facilitate the exhaust gas to enter the treatment device.

[0011] Preferably, the water pump is fixedly mounted on the lower end of the inner end of the purification box, the connecting pipe is fixedly mounted on the upper end of the water pump, the mounting rod is fixedly mounted on the upper end of the inner end of the purification box, and the atomizing nozzle is fixedly mounted on the left and right ends of the lower end of the mounting rod. The atomizing nozzle is fixedly connected to the connecting pipe to facilitate spraying of the absorbent, increase the contact area between the absorbent and the treatment, and improve the absorption effect.

[0012] Preferably, the feeding port is fixedly arranged at the left end of the upper end of the purification box, the movable plug is movably installed at the upper end of the feeding port, the drain pipe is fixedly installed at the lower end of the left end of the purification box, and the drain valve is movably installed at the upper end of the drain pipe, so as to facilitate the addition and discharge of the tail gas absorbent.

[0013] Preferably, the filtering mechanism includes a vent, a mounting groove, a filter plate, a support plate, a touch screen, a warning light, an alarm, a bottom plate and a pull ring, and the vent is fixedly arranged at the upper end of the purification box to facilitate the circulation of exhaust gas.

[0014] Preferably, the mounting groove is fixedly arranged at the upper and lower ends of the front end of the filter box, the filter plate is movably installed at the inner end of the mounting groove, and the support plate is fixedly installed at the left and right ends of the inner end of the filter box, so as to facilitate further filtering of the treated exhaust gas.

[0015] Preferably, the support plate is located at the lower end of the filter plate, the support plate is movably connected to the filter plate, and the touch display screen is fixedly installed at the upper end of the front end of the purification box, which is convenient for supporting and limiting the filter plate and facilitating subsequent replacement of the filter plate.

[0016] Preferably, the warning light is fixedly mounted on the left and right ends of the lower end of the touch display screen, the alarm is fixedly mounted on the middle part of the lower end of the touch display screen, the bottom plate is fixedly mounted on the lower end of the purification box, and the pull ring is fixedly mounted on the middle part of the front end of the filter plate. When the exhaust gas treatment is unqualified, it is convenient to remind the staff to deal with it in time, so that the unqualified exhaust gas can flow back into the purification box for further treatment.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. The tail gas treatment device for the production of dilute nitric acid is convenient for detecting the discharged nitric acid tail gas by installing the main body mechanism, and is convenient for multiple treatments of the nitric acid tail gas, thereby improving safety and practicability;

[0019] 2. The tail gas treatment device for the production of dilute nitric acid is convenient for adding and discharging tail gas absorbent by installing a purification mechanism, and convenient for spraying the absorbent through an atomizing nozzle, thereby increasing the contact area between the absorbent and the treatment, and improving the absorption effect;

[0020] 3. The tail gas treatment device for the production of dilute nitric acid is convenient for filtering the treated tail gas by installing a filtering mechanism. When the tail gas treatment is unqualified, it is convenient to remind the staff to deal with it in time, so that the unqualified tail gas can flow back into the purification box for further treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0022] Figure 2 It is a partial structural diagram of the main mechanism of the utility model;

[0023] Figure 3 This is a schematic diagram of the partial structure of the purification mechanism of the utility model;

[0024] Figure 4 This is a schematic diagram of the cross-sectional structure of the utility model

[0025] Figure 5 For this utility model Figure 4 Schematic diagram of the enlarged structure of local details;

[0026] Figure 6 It is a schematic diagram of the local structure of the filtering mechanism of the utility model.

[0027] In the figure: 1. Main body; 101. Purification box; 102. Filter box; 103. Exhaust pipe; 104. Gas detector; 105. Solenoid valve one; 106. Recovery pipe; 107. Solenoid valve two; 2. Purification mechanism; 201. Inlet pipe; 202. Inlet valve; 203. Water pump; 204. Connecting pipe; 205. Mounting rod; 206. Atomizing nozzle; 207. Feeding port; 208. Movable plug; 209. Drain pipe; 210. Drain valve; 3. Filter mechanism; 301. Vent; 302. Mounting slot; 303. Filter plate; 304. Support plate; 305. Touch screen; 306. Warning light; 307. Alarm; 308. Bottom plate; 309. Pull ring. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] Embodiment 1:

[0030] See also Figure 1 , Figure 3 , Figure 4 and Figure 6 The utility model provides a technical solution: a tail gas treatment device for the production of dilute nitric acid, comprising a main body mechanism 1, a purification mechanism 2 and a filtering mechanism 3, the purification mechanism 2 is located at the inner end of the main body mechanism 1, the filtering mechanism 3 is located at the upper end of the purification mechanism 2, the main body mechanism 1 comprises a purification box 101, a filter box 102 and an exhaust pipe 103, the filter box 102 is fixedly installed at the right end of the upper end of the purification box 101, and the exhaust pipe 103 is fixedly installed at the upper end of the filter box 102;

[0031] The main mechanism 1 also includes a gas detector 104, a solenoid valve 105, a recovery pipe 106 and a solenoid valve 2 107. The gas detector 104 is fixedly installed at the inner end of the exhaust pipe 103, the solenoid valve 105 is fixedly installed at the upper end of the outer end of the exhaust pipe 103, the recovery pipe 106 is fixedly installed at the right end of the exhaust pipe 103, the recovery pipe 106 extends to the interior of the purification box 101, and the solenoid valve 2 107 is fixedly installed at the outer end of the recovery pipe 106. The purification mechanism 2 includes an intake pipe 201, an intake valve 202, a water pump 203, a connecting pipe 204, a mounting rod 205, an atomizing nozzle 206, a feeding port 207, a movable plug 208, a drain pipe 209 and a drain valve 210. The intake pipe 201 is fixedly installed at the upper end of the outer end of the exhaust pipe 103. The air inlet valve 202 is fixedly mounted on the outer end of the air inlet pipe 201, the water pump 203 is fixedly mounted on the lower end of the inner end of the purification box 101, the connecting pipe 204 is fixedly mounted on the upper end of the water pump 203, the mounting rod 205 is fixedly mounted on the upper end of the inner end of the purification box 101, the atomizing nozzle 206 is fixedly mounted on the left and right ends of the lower end of the mounting rod 205, the atomizing nozzle 206 is fixedly connected to the connecting pipe 204, the feeding port 207 is fixedly arranged on the left end of the upper end of the purification box 101, the movable plug 208 is movably mounted on the upper end of the feeding port 207, the drain pipe 209 is fixedly mounted on the lower end of the left end of the purification box 101, and the drain valve 210 is movably mounted on the upper end of the drain pipe 209.

[0032] Through this embodiment, first, when treating the tail gas generated by the production of dilute nitric acid, the staff adds part of the absorbent into the purification box 101 through the feeding port 207, and the tail gas enters the purification box 101 through the air inlet pipe 201. The tail gas emerges from the bottom of the absorbent and partially contacts with the absorbent, which is absorbed by the absorbent. The water pump 203 then draws the absorbent to the top of the purification box 101 through the connecting pipe 204 and sprays it from the atomizing nozzle 206, so that the tail gas contacts with the absorbent again to improve the absorption effect. A small part of the tail gas that has not been absorbed enters the filter box 102 through the vent 301, and the filter plate 303 filters the tail gas to prevent the tail gas from polluting the environment. The filter plate 303 can be replaced after long-term use. The filter plate 303 can be pulled out of the filter box 102 by pulling the pull ring 309, and the support plate 304 supports and limits the filter plate 303.

[0033] Embodiment 2: Figure 2 and Figure 5The filter mechanism 3 includes a vent 301, a mounting groove 302, a filter plate 303, a support plate 304, a touch screen 305, a warning light 306, an alarm 307, a bottom plate 308 and a pull ring 309. The vent 301 is fixedly arranged at the upper end of the purification box 101, the mounting groove 302 is fixedly arranged at the upper and lower ends of the front end of the filter box 102, the filter plate 303 is movably installed at the inner end of the mounting groove 302, and the support plate 304 is fixedly installed at the inner end of the filter box 102. The left and right ends of the touch screen 305 are fixed, the support plate 304 is located at the lower end of the filter plate 303, the support plate 304 is movably connected to the filter plate 303, the touch screen 305 is fixedly installed at the upper end of the front end of the purification box 101, the warning light 306 is fixedly installed at the left and right ends of the lower end of the touch screen 305, the alarm 307 is fixedly installed in the middle of the lower end of the touch screen 305, the bottom plate 308 is fixedly installed at the lower end of the purification box 101, and the pull ring 309 is fixedly installed in the middle of the front end of the filter plate 303.

[0034] In combination with Example 1, it is further realized that the exhaust gas after filtration is discharged through the exhaust pipe 103, and the gas detector 104 detects the exhaust gas in the exhaust pipe 103. When the treatment is qualified, the solenoid valve 105 is opened, and the solenoid valve 2 107 on the recovery pipe 106 is closed, and the gas is discharged from the exhaust pipe 103. When the exhaust gas treatment is unqualified, the gas detector 104 transmits the information to the touch screen 305, and the warning light 306 and the alarm 307 simultaneously remind the staff to handle it, the solenoid valve 105 is closed, and the solenoid valve 2 107 is opened, and the exhaust gas that has not been treated qualified re-enters the purification box 101 through the recovery pipe 106 for treatment again.

[0035] Working principle: First, when treating the tail gas produced by the production of dilute nitric acid, the staff adds part of the absorbent into the purification box 101 through the feed port 207, and the tail gas enters the purification box 101 through the air inlet pipe 201. The tail gas emerges from the bottom of the absorbent and partially contacts with the absorbent, which is absorbed by the absorbent. The water pump 203 then draws the absorbent to the top of the purification box 101 through the connecting pipe 204 and sprays it from the atomizing nozzle 206, so that the tail gas contacts with the absorbent again to improve the absorption effect. The small part of the tail gas that has not been absorbed enters the filter box 102 through the vent 301, and the filter plate 303 filters the tail gas to prevent the tail gas from polluting the environment. The filter plate 303 can be replaced after long-term use, and the filter plate 303 can be replaced by pulling the pull ring 309. The plate 303 can be pulled out from the filter box 102, and the support plate 304 supports and limits the filter plate 303. The filtered exhaust gas is discharged through the exhaust pipe 103, and the gas detector 104 detects the exhaust gas in the exhaust pipe 103. When the treatment is qualified, the solenoid valve 105 opens, and the solenoid valve 2 107 on the recovery pipe 106 is closed, and the gas is discharged from the exhaust pipe 103. When the exhaust gas treatment is unqualified, the gas detector 104 transmits the information to the touch screen 305, and the warning light 306 and the alarm 307 remind the staff to handle it at the same time, the solenoid valve 105 is closed, and the solenoid valve 2 107 is opened, and the unqualified exhaust gas re-enters the purification box 101 through the recovery pipe 106 for further treatment.

[0036] Finally, it should be noted that the above content is only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Simple modifications or equivalent substitutions of the technical solution of the utility model by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the utility model.

Claims

1. A tail gas treatment device for the production of dilute nitric acid, comprising a main body mechanism (1), a purification mechanism (2) and a filtering mechanism (3), characterized in that: The purification mechanism (2) is located at the inner end of the main body mechanism (1), and the filtering mechanism (3) is located at the upper end of the purification mechanism (2). The main body mechanism (1) comprises a purification box (101), a filtering box (102) and an exhaust pipe (103). The filtering box (102) is fixedly mounted at the right end of the upper end of the purification box (101), and the exhaust pipe (103) is fixedly mounted at the upper end of the filtering box (102). The main body (1) also includes a gas detector (104), a solenoid valve 1 (105), a recovery pipe (106) and a solenoid valve 2 (107); the gas detector (104) is fixedly mounted on the inner end of the exhaust pipe (103); the solenoid valve 1 (105) is fixedly mounted on the upper end of the outer end of the exhaust pipe (103); the recovery pipe (106) is fixedly mounted on the right end of the exhaust pipe (103); the recovery pipe (106) extends to the interior of the purification box (101); and the solenoid valve 2 (107) is fixedly mounted on the outer end of the recovery pipe (106).

2. The tail gas treatment device for dilute nitric acid production according to claim 1, characterized in that: The purification mechanism (2) comprises an air intake pipe (201), an air intake valve (202), a water pump (203), a connecting pipe (204), a mounting rod (205), an atomizing nozzle (206), a feeding port (207), a movable plug (208), a drainage pipe (209) and a drainage valve (210); the air intake pipe (201) is fixedly mounted on the upper end of the left end of the purification box (101); and the air intake valve (202) is fixedly mounted on the outer end of the air intake pipe (201).

3. The tail gas treatment device for dilute nitric acid production according to claim 2, characterized in that: The water pump (203) is fixedly mounted on the lower end of the inner end of the purification box (101), the connecting pipe (204) is fixedly mounted on the upper end of the water pump (203), the mounting rod (205) is fixedly mounted on the upper end of the inner end of the purification box (101), the atomizing nozzle (206) is fixedly mounted on the left and right ends of the lower end of the mounting rod (205), and the atomizing nozzle (206) is fixedly connected to the connecting pipe (204).

4. The tail gas treatment device for dilute nitric acid production according to claim 3, characterized in that: The feed port (207) is fixedly arranged at the left end of the upper end of the purification box (101), the movable plug (208) is movably installed at the upper end of the feed port (207), the drain pipe (209) is fixedly installed at the lower end of the left end of the purification box (101), and the drain valve (210) is movably installed at the upper end of the drain pipe (209).

5. The tail gas treatment device for dilute nitric acid production according to claim 4, characterized in that: The filtering mechanism (3) comprises a vent hole (301), a mounting groove (302), a filter plate (303), a support plate (304), a touch display screen (305), a warning light (306), an alarm (307), a bottom plate (308) and a pull ring (309), and the vent hole (301) is fixedly arranged at the upper end of the purification box (101).

6. A tail gas treatment device for dilute nitric acid production according to claim 5, characterized in that: The mounting groove (302) is fixedly mounted at the upper and lower ends of the front end of the filter box (102), the filter plate (303) is movably mounted at the inner end of the mounting groove (302), and the support plate (304) is fixedly mounted at the left and right ends of the inner end of the filter box (102).

7. A tail gas treatment device for dilute nitric acid production according to claim 6, characterized in that: The support plate (304) is located at the lower end of the filter plate (303), the support plate (304) is movably connected to the filter plate (303), and the touch display screen (305) is fixedly installed at the upper end of the front end of the purification box (101).

8. The tail gas treatment device for dilute nitric acid production according to claim 7, characterized in that: The warning light (306) is fixedly mounted on the left and right ends of the lower end of the touch screen (305), the alarm (307) is fixedly mounted in the middle of the lower end of the touch screen (305), the bottom plate (308) is fixedly mounted on the lower end of the purification box (101), and the pull ring (309) is fixedly mounted in the middle of the front end of the filter plate (303).

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