Tail gas absorption system for bromide

Abstract

The utility model discloses a tail gas absorption system for bromide, which belongs to the technical field of bromide production and comprises a tail gas collector connected with a tubular heat exchanger, the tubular heat exchanger is connected with a reactor, a sodium sulfite solution is filled in the reactor, and the top of the reactor is connected with a hydrogen bromide absorption box. The hydrogen bromide absorption box is connected with an adsorption tank; the adsorption tank is connected with a vacuum pump; a stirring part and an annular pipe are arranged in the reactor, the annular pipe is located above the stirring part, the top of the annular pipe is communicated with an alkali liquor pipe, one end, away from the annular pipe, of the alkali liquor pipe upwards extends out of the top end of the reactor and is connected with an alkali liquor storage tank, and a plurality of nozzles are circumferentially arranged at the bottom of the annular pipe. According to the utility model, sodium sulfite and bromine react to generate hydrogen bromide, bromine in tail gas is absorbed, and alkali liquor is utilized to neutralize hydrogen bromide, so that the problem that bromine is difficult to clean in water and alkali liquor is solved, and the bromine and hydrogen bromide in the tail gas are prevented from being discharged into air to cause harm to the environment and organisms.

Description

TECHNICAL FIELD

[0001] The utility model relates to a bromide production technical field, concretely relates to a tail gas absorption system for bromide. BACKGROUND

[0002] Bromide is a compound formed by bromine atom and other elements, and organic bromide refers to bromide in organic compound containing carbon, hydrogen, bromine and other elements. In bromination reaction, bromine and hydrogen bromide are easy to volatilize, although the condensing device is connected to the reaction device, bromine and hydrogen bromide are still volatilized as gas and discharged with tail gas, and bromine and hydrogen bromide are harmful to environment and biology, so that the tail gas containing bromine and hydrogen bromide needs to be treated through the tail gas treatment device.

[0003] The existing tail gas treatment device mostly uses vacuum water tank or alkali washing tank to absorb bromine and hydrogen bromide, but the water in the vacuum water tank is easy to be acidic and corrodes the equipment, and the solubility of bromine in water and alkaline solution is small, so it is difficult to clean completely, leading to that the tail gas emission is not up to standard.

[0004] In view of the problems existing in the prior art, the utility model combines the design and use experience in relevant fields for many years, and designs and manufactures a tail gas absorption system for bromide to overcome the above defects. UTILITY MODEL CONTENTS

[0005] For the problems existing in the prior art, the tail gas absorption system for bromide provided by the utility model absorbs bromine and hydrogen bromide contained in the tail gas through sodium sulfite and bromine reaction and acid-base reaction, so that bromine and hydrogen bromide in the tail gas will not damage the equipment, and the harm of bromine and hydrogen bromide to the environment and human beings caused by emission into the atmosphere is avoided.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme: a tail gas absorption system for bromide, comprising a tail gas collector, the gas outlet of the tail gas collector is connected with a tubular heat exchanger, the gas outlet of the tubular heat exchanger is connected with a reactor, the reactor is provided with sodium sulfite solution, the top of the reactor is connected with a hydrogen bromide absorption tank through a blower, the gas outlet of the hydrogen bromide absorption tank is connected with an adsorption tank, and the gas outlet of the adsorption tank is connected with a vacuum pump.

[0007] The reactor is provided with a stirring part and an annular pipe, the annular pipe is located above the stirring part, the top of the annular pipe is communicated with a lye pipe, the lye pipe extends upwards from the end of the annular pipe away from the reactor top end and is connected with a lye storage tank, a plurality of nozzles are arranged in the periphery of the bottom of the annular pipe, and a support rod is connected between the annular pipe and the reactor.

[0008] Preferably, the stirring component comprises a rotating shaft, a plurality of stirring shafts are arranged on the rotating shaft, the lower end of the rotating shaft extends out of the bottom of the reactor and is connected with a driving component.

[0009] Preferably, the rotating shaft is a hollow structure and is open at the top, the lower end of the rotating shaft is communicated with two L-shaped pipes, the two L-shaped pipes are located in the reactor, the two L-shaped pipes are respectively communicated with the hollow of the rotating shaft, and a plurality of through holes are communicated with the inner sides of the two L-shaped pipes.

[0010] The tubular heat exchanger is connected with the reactor through a gas conveying pipe, the connecting end of the gas conveying pipe with the reactor penetrates through the top of the reactor, and the gas conveying pipe is rotationally connected with the upper end of the rotating shaft.

[0011] Preferably, the driving component is an electric motor.

[0012] Preferably, a pH detector is arranged in the reactor.

[0013] Preferably, a protection box is arranged on the inner wall of the reactor, an electric telescopic rod is arranged in the protection box, and the output end of the electric telescopic rod extends out of the bottom end of the protection box and is connected with the pH detector.

[0014] Preferably, an observation window is arranged on the reactor.

[0015] Preferably, the alkali liquid storage tank is communicated with the hydrogen bromide absorption tank and the reactor through a three-way valve.

[0016] Preferably, sodium hydroxide solution is arranged in the alkali liquid storage tank, and water is arranged in the hydrogen bromide absorption tank.

[0017] Preferably, an activated carbon adsorption layer is arranged in the adsorption tank.

[0018] The utility model discloses beneficial effects are as follows:

[0019] 1. The utility model discloses a tail gas is passed into the reactor containing sulfurous acid solution, utilizes sodium sulfite and bromine in tail gas reaction absorption bromine, then through alkali liquid storage tank adds alkali liquid to the reactor, neutralizes bromine hydrogen and the bromine hydrogen of reaction generation in tail gas, and residual bromine hydrogen gas is absorbed through buffer absorption tank, avoids bromine and bromine hydrogen in tail gas from discharging to the air to the harm of environment and organism, utilizes the spray head on annular pipe and sprays alkali liquid to the reactor, and the alkali liquid that sprays drives bromine hydrogen above the solution to sink to the bottom of the reactor and neutralizes bromine hydrogen, thereby reducing the amount of bromine hydrogen in tail gas, and the pressure of bromine hydrogen absorption tank to bromine hydrogen absorption is reduced.

[0020] 2. The utility model discloses a gas pipe and rotary shaft rotation connection, utilize the rotary shaft and L -shaped pipe direct to the sodium sulfite solution in different positions in reactor conveying tail gas, improve the contact range of tail gas and solution to the solution stirring, promote the dissolution of bromine and hydrogen bromide in tail gas, promote the absorption of bromine and hydrogen bromide to solution. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 It is a kind of tail gas absorption system for bromide.

[0022] Fig. 2 It is the schematic diagram of reactor in a kind of tail gas absorption system for bromide.

[0023] In the drawing:1-tail gas collector,2-pipe heat exchanger,3-reactor,4-hydrogen bromide absorption tank,5-adsorption tank,6-vacuum pump,7-caustic lye storage tank,8-caustic lye pipe,9-annular pipe,10-nozzle,11-rotary shaft,12-stirring shaft,13-L-shaped pipe,14-through hole,15-motor,16-gas pipe,17-rotary joint,18-protection box,19-electric telescopic rod,20-pH detector,21-supporting rod,22-observation window,23-blower. DETAILED DESCRIPTION

[0024] In order to facilitate the person skilled in the art to understand, the utility model is further explained below in conjunction with the drawings.

[0025] As Figs. 1-2 Shown, a kind of tail gas absorption system for bromide, including tail gas collector 1, the gas outlet of tail gas collector 1 is connected with pipe heat exchanger 2, the gas outlet of pipe heat exchanger 2 is connected with reactor 3, reactor 3 is equipped with sodium sulfite solution, the top of reactor 3 is connected with hydrogen bromide absorption tank 4 by blower 23, the gas outlet of hydrogen bromide absorption tank 4 is connected with adsorption tank 5, the gas outlet of adsorption tank 5 is connected with vacuum pump 6.Reactor 3 is equipped with stirring component and annular pipe 9, annular pipe 9 is located above stirring component, annular pipe 9 top is connected with caustic lye pipe 8, caustic lye pipe 8 is away from annular pipe 9 end and extends to the top end of reactor 3 and is connected with caustic lye storage tank 7 in upward.The bottom of annular pipe 9 is peripherally arranged with several nozzles 10, annular pipe 9 and reactor 3 are connected with two supporting rods 21.

[0026] The utility model discloses a pipe heat exchanger 2 is carried out to the heating of tail gas, avoids the bromine sticking in the pipe wall in winter low temperature. The stirring part can accelerate bromine in tail gas to dissolve into the solution, utilize bromine and sodium sulfite in reactor 3 to carry out the reaction and generate sodium sulfate and hydrogen bromide, and absorb bromine in tail gas. The hydrogen bromide produced in the reaction and the hydrogen bromide in tail gas are partly dissolved in the solution, and partly volatilize into gas. The nozzle 10 on the annular pipe 9 sprays lye into reactor 3, and the sprayed lye drives the hydrogen bromide above the surface of the solution to sink to the bottom of reactor 3 and neutralize hydrogen bromide, reduce the amount of hydrogen bromide, thereby reducing the volatilization amount of hydrogen bromide, and reducing the pressure of hydrogen bromide absorption tank 4 on hydrogen bromide absorption. To guarantee bromine absorption effect, the solution in reactor 3 is replaced regularly.

[0027] The stirring part includes a rotating shaft 11, a plurality of stirring shafts 12 are arranged on the rotating shaft 11, the lower end of the rotating shaft 11 extends out of the bottom of the reactor 3 and is connected with a driving part, and the rotating shaft 11 is rotationally connected with the reactor 3. The rotating shaft 11 is of a hollow structure and is open at the top, the lower end of the rotating shaft 11 is communicated with two L-shaped pipes 13, the two L-shaped pipes 13 are arranged in the reactor 3, the two L-shaped pipes 13 are respectively communicated with the hollow of the rotating shaft 11, and a plurality of through holes 14 are arranged in the inner sides of the two L-shaped pipes 13. The driving part is a motor 15. The pipe heat exchanger 2 is connected with the reactor 3 through a gas conveying pipe 16, the gas conveying pipe 16 is vertically arranged, the connecting end of the gas conveying pipe 16 with the reactor 3 penetrates through the top of the reactor 3, the gas conveying pipe 16 is rotationally connected with the upper end of the rotating shaft 11, and specifically, the gas conveying pipe 16 is rotationally connected with the upper end of the rotating shaft 11 through a rotating joint 17.

[0028] The motor 15 drives the rotating shaft 11 to rotate, the rotating shaft 11 drives the stirring shafts 12 and the L-shaped pipes 13 to rotate, and the solution in the reactor 3 is stirred. The gas conveying pipe 16 is communicated with the rotating shaft 11, the tail gas enters the rotating shaft 11, the L-shaped pipes 13 and the sodium sulfite solution in the through holes 14 in sequence from the gas conveying pipe 16, the tail gas is uniformly dispersed in the solution in the process of the L-shaped pipes 13 rotating, the dissolution of bromine and hydrogen bromide in the solution is accelerated, the contact range of bromine and sodium sulfite is improved, and the reaction of bromine and sodium sulfite is promoted.

[0029] A pH detector 20 is arranged in the reactor 3, a protection box 18 is arranged on the inner wall of the reactor 3, an electric telescopic rod 19 is arranged in the protection box 18, and the output end of the electric telescopic rod 19 extends out of the bottom of the protection box 18 and is connected with the pH detector 20. An observation window 22 is arranged on the reactor 3, and a liquid outlet is arranged at the bottom of the reactor 3. The pH of the solution in the reactor 3 is detected through the pH detector 20, so that the amount of added lye is prevented from being too much or too little, when the lye is added into the reactor 3, the output end of the electric telescopic rod 19 is controlled to extend out, the pH detector 20 is driven to move downwards, and the pH in the solution is detected. The bromine reaction in the reactor 3 is observed through the observation window 22.

[0030] The alkali liquid storage tank 7 is connected with the hydrogen bromide absorption tank 4 through a pipeline, and the communication between the alkali liquid storage tank 7 and the reactor 3 and the communication between the alkali liquid storage tank 7 and the hydrogen bromide absorption tank 4 are controlled through a three-way valve.

[0031] In the utility model, the residual hydrogen bromide in the tail gas is absorbed by water in the hydrogen bromide absorption tank 4, and sodium hydroxide is added into the hydrogen bromide absorption tank 4 through the alkali liquid storage tank 7 after a period of time, so that the water in the hydrogen bromide absorption tank 4 is prevented from becoming acidic and causing corrosion. The activated carbon adsorption layer processes the peculiar smell in the tail gas.

[0032] Specific operation process

[0033] The tail gas in the tail gas collector 1 is discharged into the tubular heat exchanger 2 for heating, the motor 15 is started, the motor 15 drives the rotating shaft 11 to rotate, the rotating shaft 11 drives the stirring shaft 12 and the L-shaped pipe 13 to rotate, and the sodium sulfite solution is stirred. The heated tail gas enters the reactor 3 through the gas conveying pipe 16, enters the L-shaped pipe 13 from the cavity of the rotating shaft 11, diffuses into the sodium sulfite solution from the through hole 14 of the L-shaped pipe 13, and the bromine and hydrogen bromide in the tail gas are dissolved in water, and the bromine reacts with sodium sulfite to generate sodium sulfate and hydrogen bromide.

[0034] Then the output end of the electric telescopic rod 19 is controlled to move downward, the pH detector 20 is driven to move downward, and the pH detector 20 can detect the pH of the solution. The communication between the alkali liquid pipe 8 and the reactor 3 of the three-way valve on the alkali liquid pipe 8 is opened, and the alkali liquid storage tank 7 starts to convey the sodium hydroxide solution. The sodium hydroxide solution enters the annular pipe 9 from the alkali liquid pipe 8, and is sprayed into the reactor 3 from the nozzle 10 of the annular pipe 9. The sprayed sodium hydroxide solution carries the hydrogen bromide gas above the solution to the bottom of the solution, and neutralizes the hydrogen bromide.

[0035] The air blower 23 is started, the air blower 23 conveys the tail gas to the bottom of the hydrogen bromide absorption tank 4, and the water in the hydrogen bromide absorption tank 4 absorbs the residual hydrogen bromide in the tail gas. The communication between the alkali liquid pipe 8 and the hydrogen bromide absorption tank 4 of the three-way valve is opened, and the sodium hydroxide solution is introduced into the hydrogen bromide absorption tank 4 to neutralize the hydrogen bromide. Finally, the peculiar smell is removed through the adsorption tank 5, and the vacuum pump 6 discharges the qualified tail gas.

[0036] It should be understood that the use of these embodiments is only for the purpose of illustrating the utility model and is not intended to limit the protection scope of the utility model. In addition, it should also be understood that after reading the technical content of the utility model, those skilled in the art can make various modifications, modifications and / or variations to the utility model, and all these equivalent forms also fall within the protection scope defined by the claims attached to the present application.

Claims

1. A tail gas absorption system for bromide, characterized in that, The device includes an exhaust gas collector, the outlet of which is connected to a tubular heat exchanger, the outlet of which is connected to a reactor, the reactor containing a sodium sulfite solution, the top of which is connected to a hydrogen bromide absorption tank via a blower, the outlet of which is connected to an adsorption tank, and the outlet of which is connected to a vacuum pump. The reactor is equipped with a stirring component and an annular tube. The annular tube is located above the stirring component. An alkali solution pipe is connected to the top of the annular tube. The end of the alkali solution pipe away from the annular tube extends upward to the top of the reactor and is connected to an alkali solution storage tank. Several nozzles are arranged circumferentially at the bottom of the annular tube. A support rod connects the annular tube and the reactor.

2. The bromide tail gas absorption system according to claim 1, characterized in that, The stirring component includes a rotating shaft with several stirring shafts on it. The lower end of the rotating shaft extends out of the bottom of the reactor and is connected to a driving component.

3. The bromide tail gas absorption system according to claim 2, characterized in that, The rotating shaft has a hollow structure and an open top. The lower end of the rotating shaft is connected to two L-shaped tubes. The two L-shaped tubes are located inside the reactor and are respectively connected to the hollow cavity of the rotating shaft. Several through holes are connected to the inner side of the two L-shaped tubes. The tubular heat exchanger is connected to the reactor via a gas supply pipe. The gas supply pipe is connected to the reactor through the top of the reactor and is rotatably connected to the upper end of the rotating shaft.

4. The bromide tail gas absorption system according to claim 2, characterized in that, The driving component is a motor.

5. The bromide tail gas absorption system according to claim 1, characterized in that, The reactor is equipped with a pH detector.

6. The bromide tail gas absorption system according to claim 5, characterized in that, The reactor has a protective box on its inner wall, and an electric telescopic rod is installed inside the protective box. The output end of the electric telescopic rod extends out of the bottom of the protective box and is connected to the pH detector.

7. The bromide tail gas absorption system according to claim 1, characterized in that, The reactor is equipped with an observation window.

8. The bromide tail gas absorption system according to claim 1, characterized in that, The alkaline solution storage tank is connected to the hydrogen bromide absorption tank and the reactor via a three-way valve.

9. A tail gas absorption system for bromide treatment according to claim 1, characterized in that, The alkaline storage tank contains sodium hydroxide solution, and the hydrogen bromide absorption tank contains water.

10. A tail gas absorption system for bromide treatment according to claim 1, characterized in that, The adsorption tank is equipped with an activated carbon adsorption layer.

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