CN216223730U

CN216223730U - Tail gas treatment system is used in nitric acid production

Info

Publication number: CN216223730U
Application number: CN202122151850.XU
Authority: CN
Inventors: 朱宏志; 王杰彬; 崔丽娟; 李艳英; 李俊杰; 刘丹
Original assignee: Henan Pingmei Shenma Nylon Engineering Technology Co ltd
Current assignee: Henan Pingmei Shenma Nylon Engineering Technology Co ltd
Priority date: 2021-09-07
Filing date: 2021-09-07
Publication date: 2022-04-08
Anticipated expiration: 2031-09-07

Abstract

The utility model relates to the technical field of tail gas treatment devices, in particular to a tail gas treatment system for nitric acid production, which is provided with a liquid level control device which is matched with a trigger device to automatically control the height of the liquid level of a spray tank, so as to avoid the influence of the overhigh liquid level in the spray tank on the tail gas treatment effect, wherein the liquid level in the spray tank can gradually rise along with the spray of the tail gas by the liquid released by a spray head to drive a floating ball to rise, a trigger button is triggered by a trigger rod, and a stepping motor is started by the trigger button, the vertical rod moves upwards under the driving of the stepping motor to separate from the plugging of the liquid leakage hole, the liquid is discharged from the vertical pipe through the liquid leakage hole, the liquid level in the spraying tank is reduced, the floating ball is also reduced along with the reduction of the liquid level to trigger the reset button through the trigger rod, the stepping motor is enabled to reset, the stepping motor drives the vertical rod to reset and plug the liquid leakage hole, and the liquid level control device can automatically control the liquid level of the spraying tank in cooperation with the trigger device.

Description

Tail gas treatment system is used in nitric acid production

Technical Field

The utility model relates to the technical field of tail gas treatment devices, in particular to a tail gas treatment system for nitric acid production.

Background

The nitric acid industry in the chemical industry has higher pollution, China is a big country for global nitric acid production, and therefore attention needs to be paid to pollution treatment in the nitric acid production process. In the production process of nitric acid, a large amount of tail gas is generated, wherein the tail gas mainly comprises nitrogen oxide, and if the nitrogen oxide is directly discharged into the atmosphere without being treated, the environment is seriously polluted, and the human health is further influenced. Nitrogen oxide tail gas in the present nitric acid production process mainly adopts the wet process to spray the processing, but the spray column generally is inclosed structure, and the material that the spray column used is not convenient for observe its inside condition, consequently can't learn liquid level height in the spray column, nevertheless can influence tail gas treatment effect when the liquid level is higher in the spray column, if according to the frequent liquid that discharges in the spray column of passing through of experience of use, so that the liquid level keeps in the within range that suitable tail gas was handled, then can cause the loaded down with trivial details of work, and the incident can also take place for artifical the emission.

SUMMERY OF THE UTILITY MODEL

Aiming at the situation and overcoming the defects of the prior art, the utility model provides a tail gas treatment system for nitric acid production, which solves the technical scheme that the tail gas treatment system comprises a spraying tank, wherein the bottom of the spraying tank is provided with a liquid level control device, and the upper side of the spraying tank is provided with a trigger device for triggering the liquid level control device;

liquid level control device include with the standpipe that sprays tank bottoms portion intercommunication, the standpipe upside has a plurality of weeping holes along the circumference equipartition, there is the montant that can shutoff weeping hole along vertical sliding fit in the standpipe, the standpipe upper end is rotated and is connected with the seal cover, coaxial and the body coupling in seal cover upper end has the thread bush with montant screw-thread fit, coaxial fixedly connected with driven bevel gear on the thread bush outer fringe, the both sides are fixedly connected with vertical arrangement's spacing guide rail respectively around spraying on the tank bottom surface standpipe, montant upper end fixedly connected with longitudinal arrangement's gag lever post, both ends are rather than the vertical sliding fit of spacing guide rail who corresponds the side around the gag lever post, it is equipped with the step motor who is connected with trigger device's electricity to spray the jar outside, step motor's output shaft and the coaxial fixedly connected with of tip and the driven bevel gear meshed initiative bevel gear of the lateral wall rotation connection of spraying the jar and output shaft.

As preferred, trigger device include with spray tank inner wall fixed connection's layer board, vertical arrangement's splined hole has been seted up to the layer board upper end, the downthehole vertical sliding fit of splined hole has the integral key shaft, integral key shaft lower extreme fixedly connected with floater, the coaxial fixedly connected with of integral key shaft and layer board upper end contact complex fender dish, the L type pole that the integral key shaft right side fixedly connected with free end upwards extended, spray tank inner wall fixedly connected with transverse arrangement and left end be the wiring pipe of cecum, wiring pipe lower extreme left side intercommunication has vertical arrangement's connecting pipe, the upwards extension end and the vertical sliding fit of connecting pipe of L type pole, connecting pipe left side intercommunication has the mounting box, the upper and lower both sides of mounting box are installed respectively and are connected with the start button and the reset button of being connected with step motor electricity, the upwards extension end fixedly connected with of L type pole can carry out the complex trigger lever with start button and reset button.

Preferably, a tail gas inlet pipe is arranged on the outer side of the spraying tank, the outlet end of the tail gas inlet pipe is communicated with the inlet end of the cooling chamber, the outlet end of the cooling chamber is communicated with the inlet end of the guide pipe, the outlet end of the guide pipe is communicated with the bottom of the spraying tank, a spraying frame is coaxially and fixedly connected in the spraying tank, a plurality of uniformly distributed spraying heads are uniformly distributed on the spraying frame, and the spraying heads are connected with an external liquid supply device.

Preferably, the bottom of the spraying tank is communicated with a standby liquid discharge pipe, and a liquid discharge valve is installed on the liquid discharge pipe.

Preferably, the rotating connection part of the output shaft of the stepping motor and the side wall of the spraying tank is provided with sealant, and the sliding fit contact part of the L-shaped rod and the connecting pipe is provided with sealant.

Preferably, the upper end of the spraying tank is communicated with an exhaust pipe.

The utility model has the beneficial effects that:

the liquid level control device cooperation trigger device that is equipped with can the automatic control spray the height of a jar liquid level, avoid the too high influence of liquid level in the jar that sprays to the treatment effect of tail gas, spray tail gas along with shower head release liquid, the liquid level in the jar that sprays can rise gradually and drive the floater and rise and go forward and trigger start button and start step motor through start button through the trigger bar, montant rebound breaks away from the shutoff to the weeping hole under step motor's drive, liquid passes through the weeping hole and discharges from the standpipe, the liquid level in the jar that sprays will reduce, along with the liquid level reduction floater also can descend and go forward and trigger reset button through the trigger bar, make step motor reset, step motor drives the montant again and resets and shutoff weeping hole, the height that liquid level control device cooperation trigger device can automatic control spray a jar liquid level has been realized.

Drawings

FIG. 1 is a front elevational view, in full section, of the present invention.

Fig. 2 is an enlarged view of area a in a front view of the utility model in full section.

Fig. 3 is a front view of the present invention.

Fig. 4 is a perspective sectional view of the triggering device of the present invention.

Fig. 5 is an enlarged view of the area B in a perspective cross-sectional view of the triggering device of the present invention.

FIG. 6 is a perspective cross-sectional view of the fluid level control apparatus of the present invention.

Reference numerals

1. The automatic spraying device comprises a spraying tank, 2 parts of vertical pipes, 3 parts of liquid leakage holes, 4 parts of vertical rods, 5 parts of sealing sleeves, 6 parts of threaded sleeves, 7 parts of driven bevel gears, 8 parts of limiting guide rails, 9 parts of limiting rods, 10 parts of stepping motors, 11 parts of output shafts, 12 parts of driving bevel gears, 13 parts of supporting plates, 14 parts of spline shafts, 15 parts of floating balls, 16 parts of baffle discs, 17 parts of L-shaped rods, 18 parts of wiring pipes, 19 parts of connecting pipes, 20 parts of mounting boxes, 21 parts of starting buttons, 22 parts of reset buttons, 23 parts of trigger rods, 24 parts of tail gas inlet pipes, 25 parts of cooling chambers, 26 guide pipes, 27 parts of spraying racks, 28 parts of spraying heads, 29 parts of standby liquid discharge pipes, 30 parts of liquid discharge valves and 31 parts of gas discharge pipes.

Detailed Description

The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings 1 to 6.

At present, nitrogen oxide tail gas in the nitric acid production process is mainly treated by wet spraying, and in order to avoid the influence on the tail gas treatment effect caused by more liquid accumulated in the spraying tank 1 during spraying treatment, a trigger device is arranged to be matched with a liquid level control device to automatically control the liquid level in the spraying tank 1.

When the tail gas treatment device is used for tail gas treatment, tail gas enters the cooling chamber 25 through the tail gas inlet pipe 24 for cooling treatment and then enters the spray tower through the guide pipe 26, the external liquid supply device is started, and the external liquid supply device can provide alkali liquor which reacts with the tail gas. The reaction liquid provided by the external liquid supply device is sprayed out by the spray heads 28 uniformly distributed on the spray frame 27 to react with the tail gas, so as to remove harmful substances such as nitrogen oxides in the tail gas, and the spray heads 28 are uniformly distributed on the spray frame 27 so as to be capable of fully covering for spraying.

Along with spraying the going on of handling to tail gas, the liquid level in the jar 1 that sprays risees gradually, along with the liquid level risees liquid will with floater 15 contact and drive integral key shaft 14 through floater 15 and follow the splined hole rebound on the layer board 13, the last L type pole 17 of integral key shaft 14 will follow connecting pipe 19 rebound simultaneously, along with L type pole 17 along connecting pipe 19 rebound, the trigger bar 23 will contact and trigger the start button 21 with the start button 21 in the mounting box 20, start button 21 will start step motor 10 and rotate certain stroke and make montant 4 break away from the shutoff to weeping hole 3, specifically do: the stepping motor 10 drives the driven bevel gear 7 to rotate through the driving bevel gear 12 at the end part of the output shaft 11, and then the driven bevel gear 7 drives the threaded sleeve 6 and the sealing sleeve 5 integrated with the threaded sleeve 6 to rotate around the upper end of the vertical pipe 2. Along with the rotation of threaded sleeve 6, threaded sleeve 6 will drive montant 4, but under the restriction of the vertical sliding fit of gag lever post 9 on montant 4 and spacing guide rail 8, montant 4 will follow standpipe 2 and upwards slide and break away from the shutoff to weeping hole 3, and the liquid that sprays in jar 1 this moment will be discharged from standpipe 2 lower extreme through weeping hole 3. Along with the discharge of liquid, the liquid level in the spraying tank 1 gradually decreases, the floating ball 15 drives the spline shaft 14 to move downwards along with the decrease of the liquid level until the liquid level decreases to enable the floating ball 15 to return to the lowest position, at the moment, the baffle disc 16 is in contact fit with the supporting plate 13 again to limit the spline shaft 14 to move downwards continuously, at the moment, the L-shaped rod 17 also moves downwards to the lowest position along the connecting pipe 19, at the moment, the trigger rod 23 on the L-shaped rod 17 is in contact with the reset button 22 in the mounting box 20 to trigger the reset button 22, and the reset button 22 controls the stepping motor 10 to rotate reversely for a corresponding stroke to enable the vertical rod 4 to return to the initial position and seal the liquid leakage hole 3. Afterwards, the liquid level will continue to rise, and then the trigger device triggers the liquid level control device again to reduce the liquid level, so repeatedly, the liquid level is controlled not to be too high and influence the tail gas treatment effect, and the treated tail gas can be discharged by the exhaust pipe 31.

The wiring pipe 18 left end that is equipped with is located and sprays jar 1 and for the cecum, and L type pole 17 is equipped with sealed glue for vertical sliding fit and sliding fit department with connecting pipe 19, has realized trigger device's sealed when being convenient for arrange the wire, avoids the liquid of reaction to enter into the mounting box 20 in to start button 21 etc. cause the loss. The stepping motor 10 is arranged outside the spraying tank 1, so that the damage of the motor to the reaction liquid is avoided, and the output shaft 11 of the stepping motor 10 is rotatably connected with the side wall of the spraying tank 1 through sealant, so that the sealing performance is ensured. The liquid drain pipe 29 is arranged, and the liquid drain valve 30 is matched to be used, so that all liquid in the spray tank 1 can be drained out through the liquid drain pipe when needed.

Claims

1. The tail gas treatment system for nitric acid production is characterized by comprising a spraying tank (1), wherein a liquid level control device is arranged at the bottom of the spraying tank (1), and a trigger device for triggering the liquid level control device is arranged on the upper side of the spraying tank (1);

the liquid level control device comprises a vertical pipe (2) communicated with the bottom of a spray tank (1), a plurality of liquid leakage holes (3) are uniformly distributed on the upper side of the vertical pipe (2) along the circumferential direction, a vertical rod (4) capable of plugging the liquid leakage holes (3) is arranged in the vertical pipe (2) along the vertical sliding fit, a sealing sleeve (5) is rotatably connected to the upper end of the vertical pipe (2), a threaded sleeve (6) in threaded fit with the vertical rod (4) is coaxially and integrally connected to the upper end of the sealing sleeve (5), a driven bevel gear (7) is coaxially and fixedly connected to the outer edge of the threaded sleeve (6), vertically-arranged limiting guide rails (8) are respectively fixedly connected to the front side and the rear side of the vertical pipe (2) on the bottom surface of the spray tank (1), a longitudinally-arranged limiting rod (9) is fixedly connected to the upper end of the vertical rod (4), the front end and the rear end of the limiting rod (9) are respectively in vertical sliding fit with the limiting guide rails (8) on the corresponding side, a stepping motor (10) electrically connected with a trigger device is arranged on the outer side of the spray tank (1), an output shaft (11) of the stepping motor (10) is rotationally connected with the side wall of the spraying tank (1), and a driving bevel gear (12) meshed with the driven bevel gear (7) is coaxially and fixedly connected with the end part of the output shaft (11).

2. The tail gas treatment system for nitric acid production according to claim 1, wherein the trigger device comprises a supporting plate (13) fixedly connected with the inner wall of the spray tank (1), the upper end of the supporting plate (13) is provided with a vertically arranged spline hole, a spline shaft (14) is vertically and slidably matched in the spline hole, the lower end of the spline shaft (14) is fixedly connected with a floating ball (15), the spline shaft (14) is coaxially and fixedly connected with a baffle disc (16) in contact fit with the upper end of the supporting plate (13), the right side of the spline shaft (14) is fixedly connected with an L-shaped rod (17) with an upward extending free end, the inner wall of the spray tank (1) is fixedly connected with a wiring pipe (18) which is transversely arranged and has a blind end at the left end, the left side of the lower end of the wiring pipe (18) is communicated with a vertically arranged connecting pipe (19), and the upward extending end of the L-shaped rod (17) is in sliding fit with the connecting pipe (19), connecting pipe (19) left side intercommunication has mounting box (20), and start button (21) and reset button (22) that are connected with step motor (10) electricity are installed respectively to the upper and lower both sides of mounting box (20), and the upwards extension end fixedly connected with of L type pole (17) can carry out complex trigger lever (23) with start button (21) and reset button (22).

3. The tail gas treatment system for nitric acid production according to claim 1, wherein a tail gas inlet pipe (24) is arranged on the outer side of the spraying tank (1), the outlet end of the tail gas inlet pipe (24) is communicated with the inlet end of a cooling chamber (25), the outlet end of the cooling chamber (25) is communicated with the inlet end of a guide pipe (26), the outlet end of the guide pipe (26) is communicated with the bottom of the spraying tank (1), a spraying frame (27) is coaxially and fixedly connected in the spraying tank (1), a plurality of uniformly distributed spraying heads (28) are uniformly distributed on the spraying frame (27), and the spraying heads (28) are connected with an external liquid supply device.

4. The tail gas treatment system for nitric acid production according to claim 1, wherein the bottom of the spray tank (1) is communicated with a standby liquid discharge pipe (29), and a liquid discharge valve (30) is installed on the liquid discharge pipe.

5. The tail gas treatment system for nitric acid production according to claim 1, wherein a sealant is disposed at a rotational connection part of the output shaft (11) of the stepping motor (10) and the side wall of the spray tank (1), and a sealant is disposed at a sliding fit contact part of the L-shaped rod (17) and the connection pipe (19).

6. The tail gas treatment system for nitric acid production according to claim 1, wherein the upper end of the spray tank (1) is communicated with an exhaust pipe (31).