CN219058553U

CN219058553U - Nitric acid recovery system of roasting tail gas separator

Info

Publication number: CN219058553U
Application number: CN202223349077.9U
Authority: CN
Inventors: 田玉锋; 刘付亮; 张路; 巩守龙; 闫绍冲
Original assignee: Yankuang Group Yulin Fine Chemical Co ltd
Current assignee: Yankuang Group Yulin Fine Chemical Co ltd
Priority date: 2022-12-13
Filing date: 2022-12-13
Publication date: 2023-05-23
Anticipated expiration: 2032-12-13

Abstract

The utility model discloses a roasting tail gas separator nitric acid recovery system, which belongs to the technical field of roasting tail gas treatment, and particularly relates to a roasting tail gas separator nitric acid recovery system.

Description

Nitric acid recovery system of roasting tail gas separator

Technical Field

The utility model relates to the technical field of roasting tail gas treatment, in particular to a nitric acid recovery system of a roasting tail gas separator.

Background

Roasting tail gas is generally treated by water washing, gas-liquid separation, SCR (selective catalytic reduction) and the like, a small amount (about 28 percent) of dilute nitric acid (20 kg/d) is generated by a gas-liquid separator, and normally, the acid enters a sewage tank after being neutralized by alkali, so that risks of nitrogen oxide overflow, trench corrosion and the like exist in the discharge process, and meanwhile, certain economic loss can be caused by dilute nitric acid loss.

Disclosure of Invention

The utility model aims to provide a nitric acid recovery system of a roasting tail gas separator, which aims to solve the problems that roasting tail gas proposed in the background art is generally treated by water washing, gas-liquid separation, selective Catalytic Reduction (SCR) and the like, a small amount (about 28 percent) of dilute nitric acid (20 kg/d) is generated by the gas-liquid separator, and normally, the acid enters a sewage tank after being neutralized by alkali, so that risks of nitrogen oxide overflow, trench corrosion and the like exist in the discharge process, and certain economic loss is caused by the loss of the dilute nitric acid.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a calcination tail gas separator nitric acid recovery system, includes gas-liquid separator I, gas-liquid separator I's overflow mouth is connected with the collecting vat through the overflow pipe, the gas outlet of collecting vat is connected with the blow-down pipe, the air inlet of collecting vat is connected with the intake pipe, gas-liquid separator I's gas vent is connected with gas-liquid separator II through the tail gas pipe, the bin outlet of collecting vat is connected with dilute nitric acid storage tank A, gas-liquid separator II's bin outlet is connected with dilute nitric acid storage tank B, gas-liquid separator I's bin outlet is connected with the trench pipe, all be provided with the control valve on overflow pipe, blow-down pipe, intake pipe and the pipe wall of trench pipe.

Preferably, an exhaust port of the second gas-liquid separator is connected with an exhaust gas compressor.

Preferably, a pressure gauge is arranged at the upper part of the collecting tank, and a remote transmission liquid level gauge is arranged at the outer side of the collecting tank.

Preferably, the height between the first gas-liquid separator and the overflow pipe is 0.8m.

Compared with the prior art, the utility model has the beneficial effects that:

the utility model has simple structure, firstly, the separated dilute nitric acid can be sent into the dilute nitric acid storage tank A through the cooperation of the gas-liquid separator I, the overflow pipe, the collecting pipe and the air inlet pipe, the residual dilute nitric acid in the gas can be compressed and sent into the dilute nitric acid storage tank B through the cooperation of the tail gas pipe, the blow-down pipe and the gas-liquid separator II, and the mixed dilute nitric acid in the tail gas can be separated through the cooperation of the integral structure, so that the pollution to a trench can be avoided, the resource waste can be reduced, and the economic loss can be reduced.

Drawings

FIG. 1 is a schematic flow chart of the structure of the present utility model.

In the figure: 1 a gas-liquid separator I, 2 overflow pipes, 3 collecting tanks, 4 blow-down pipes, 5 air inlet pipes, 6 tail gas pipes, 7 a gas-liquid separator II, 8 dilute nitric acid storage tanks A, 9 dilute nitric acid storage tanks B and 10 ditch pipes.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Examples:

referring to fig. 1, the present utility model provides a technical solution: a nitric acid recovery system of a roasting tail gas separator comprises a first gas-liquid separator 1, and the gas-liquid separator adopts the principles of centrifugal separation and silk screen filtration to realize liquid removal. The device mainly comprises a barrel, a cyclone separator, a high-efficiency foam breaking net, a blow-down valve and other main components, wherein an overflow port of the first gas-liquid separator 1 is connected with a collecting tank 3 through an overflow pipe 2, dilute nitric acid liquid separated in the first gas-liquid separator 1 can flow into the collecting tank 3 through the overflow pipe 2, an air outlet of the collecting tank 3 is connected with a blow-down pipe 4, gas in the collecting tank 3 can be discharged through the blow-down pipe 4, an air inlet pipe 5 is connected with an air inlet of the collecting tank 3, factory air can be added into the collecting tank 3 through the air inlet pipe 5, so that the internal dilute nitric acid liquid can be pressed to flow downwards, an air outlet of the first gas-liquid separator 1 is connected with a second gas-liquid separator 7 through a tail gas pipe 6, an exhaust port of the collecting tank 3 is connected with a dilute nitric acid storage tank A8, an exhaust port of the second gas-liquid separator 7 is connected with a dilute nitric acid storage tank B9, nitric acid liquid separated in the second gas separator 7 can be discharged, and the first gas-liquid separator 1 is connected with an air inlet pipe 10, and the air outlet pipe 10 is connected with the air inlet pipe 10 in sequence, and the air outlet pipe 10 is connected with the air outlet pipe 10, and the air outlet valve is controlled by the air outlet pipe 10.

The exhaust port of the second gas-liquid separator 7 is connected with a tail gas compressor, dilute nitric acid in tail gas can be compressed into liquid, the upper portion of the collecting tank 3 is provided with a pressure gauge, the outer side of the collecting tank 3 is provided with a remote transmission liquid level gauge, the safety and the automatic operation of the conveying process can be ensured, the height between the first gas-liquid separator 1 and the overflow pipe 2 is 0.8m, and dust in roasting tail gas is ensured to be settled at the bottom and not overflowed.

Working principle: firstly, roasting tail gas enters from the lower part of a first gas-liquid separator 1, nitric acid-containing liquid is separated, the separated gas flows out from a tail gas pipe 6 and enters the inside of a second gas-liquid separator 7, a control valve on a trench pipe 10 connected with a bottom discharge port is in a normally closed state, dilute nitric acid liquid can be accumulated from the bottom to an overflow pipe 2 with the height of 0.8m, dust in the roasting tail gas can be ensured to settle at the bottom and not overflow, when the dilute nitric acid liquid is higher than the overflow pipe 2, the dilute nitric acid liquid can outwards flow out and enter a collecting tank 3, at the moment, the control valve on the overflow pipe 2 is opened, a control valve on a blow-down pipe 4 and an air inlet pipe 5 are in a closed state, and a remote liquid level meter arranged on the side surface of the collecting tank 3 and a pressure gauge arranged at the top can ensure that the conveying process is safe and automatic operation. When the remote liquid level gauge detects that the dilute nitric acid reaches 0.6m, the process can be carried out, at the moment, the control valve on the overflow pipe 2 can be closed, meanwhile, the control valve on the emptying pipe 4 is kept in a closed state, then the control valve on the air inlet pipe 5 is opened, the dilute nitric acid in the collecting tank 3 is pressed and conveyed into the dilute nitric acid storage tank A8 by using factory air (0.35 MPa), when the liquid level returns to 0m, the process enters the pressure relief, at the moment, the control valve on the overflow pipe 2 is kept closed, the control valve on the air inlet pipe 5 is closed, then the control valve on the emptying pipe 4 is opened, so that factory air can be emptied to the tail gas pipe 6, the process can be repeated after 20-30 seconds is opened, the effect of circularly collecting the dilute nitric acid liquid can be achieved, meanwhile, the emptied control mixed tail gas can enter the interior of the gas-liquid separator II 7, then the dilute nitric acid liquid remained in the interior can be compressed into the dilute nitric acid storage tank B9 by the connected tail gas compressor, the liquid recovery rate can be reduced along the discharge port, and the waste of the dilute nitric acid liquid can be improved.

While the fundamental and principal features of the utility model and advantages of the utility model have been shown and described, it will be apparent to those skilled in the art that the utility model is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a calcination tail gas separator nitric acid recovery system, includes gas-liquid separator one (1), its characterized in that: the overflow outlet of the first gas-liquid separator (1) is connected with a collecting tank (3) through an overflow pipe (2), the air outlet of the collecting tank (3) is connected with a blow-down pipe (4), the air inlet of the collecting tank (3) is connected with an air inlet pipe (5), the air outlet of the first gas-liquid separator (1) is connected with a second gas-liquid separator (7) through a tail gas pipe (6), the discharge outlet of the collecting tank (3) is connected with a dilute nitric acid storage tank A (8), the discharge outlet of the second gas-liquid separator (7) is connected with a dilute nitric acid storage tank B (9), the discharge outlet of the first gas-liquid separator (1) is connected with a ground pipe (10), and control valves are arranged on the pipe walls of the overflow pipe (2), the blow-down pipe (4), the air inlet pipe (5) and the ground pipe (10).

2. The roasting tail gas separator nitric acid recovery system according to claim 1, wherein: and an exhaust port of the second gas-liquid separator (7) is connected with an exhaust gas compressor.

3. The roasting tail gas separator nitric acid recovery system according to claim 1, wherein: the upper portion of collecting vat (3) is installed the manometer, the teletransmission level gauge is installed in the outside of collecting vat (3).

4. The roasting tail gas separator nitric acid recovery system according to claim 1, wherein: the height between the first gas-liquid separator (1) and the overflow pipe (2) is 0.8m.