Waste gas scrubbing device for bromine production

Abstract

The utility model relates to a waste gas scrubbing device for bromine production, and belongs to the technical field of bromine production tail gas treatment equipment. The device comprises an alkali tank, an alkali pump, a tail gas absorption tower, an oxidation tower, a blow-out tower and a brine pump, the alkali tank is connected with the tail gas absorption tower through the alkali pump, the top of the tail gas absorption tower is provided with a blow-down pipe, the brine pump is connected with the oxidation tower, the bottom of the oxidation tower is connected with the tail gas absorption tower, and the top of the oxidation tower and the tail gas absorption tower are both connected with the blow-out tower. According to the utility model, the alkali liquor and the brine are matched for tail gas treatment, so that related substances can be recovered while the tail gas treatment effect is ensured, and the treatment cost is greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of waste gas washing device for bromine production, belong to bromine production tail gas treatment equipment technical field. BACKGROUND

[0002] As a chemical product, bromine is mainly used for making bromide, and has a wide range of applications in medicine, pesticides, fire extinguishing agent, metallurgy, ore dressing and water purification. The production process of bromine has become mature, and the most widely used method is air blowing. The main process is to adjust the pH of seawater or underground brine with low bromine content to about 3 using hydrochloric acid or sulfuric acid, introduce chlorine gas to oxidize bromide ions into bromine molecules, blow the bromine molecules with air, absorb the bromine molecules with sulfur dioxide and water to convert them into hydrobromic acid, and then increase the bromine content to 30-100g / L. Subsequently, bromine products are obtained by distillation and separation.

[0003] However, the air blowing method has the problem of exhaust gas emptying. The main components of the exhaust gas during the air blowing bromine production process are chlorine gas and bromine gas. If they are directly emptied without treatment, it will seriously affect the air quality and harm human health. In the prior art, Chinese patent document CN212492318U discloses a tail gas absorption device for air blowing bromine production, which uses alkali liquor to absorb and treat the tail gas. However, this device uses pure alkali liquor for treatment, which is costly and the treatment process is simple. SUMMARY

[0004] To overcome the shortcomings of the prior art, the utility model provides a kind of waste gas washing device for bromine production, which uses alkali liquor and brine to treat tail gas, ensures the treatment effect of tail gas, and recovers related substances, greatly reducing the treatment cost.

[0005] The technical scheme of the utility model is as follows:

[0006] A waste gas washing device for bromine production includes an alkali tank, an alkali pump, a tail gas absorption tower, an oxidation tower, a blowing tower and a brine pump. The alkali tank is connected to the tail gas absorption tower by the alkali pump. The top of the tail gas absorption tower is provided with a vent pipe. The brine pump is connected to the oxidation tower through a brine inlet pipe. The bottom of the oxidation tower is connected to the tail gas absorption tower through a brine outlet pipe. The top of the oxidation tower and the tail gas absorption tower are both connected to the blowing tower.

[0007] According to the utility model, a flow meter and an electromagnetic valve are arranged on the alkali liquor conveying pipe between the alkali pump and the tail gas absorption tower to monitor and control the flow of alkali liquor.

[0008] According to the utility model, a PH detector and a hand valve are arranged on the brine outlet pipe between the oxidation tower and the tail gas absorption tower to monitor the PH value of the brine and control the flow.

[0009] According to the utility model preferred, the tail gas absorption tower is internally provided with a filler.

[0010] In use, the tail gas absorption tower is connected with tail gas generated in a bromine production process to produce bromine on a large scale.

[0011] When the bromine production amount is small and the tail gas discharge amount is small, brine absorption is adopted, the brine pump is opened, external brine enters the tail gas absorption tower after passing through an oxidation tower, absorbs chlorine and bromine in the tail gas, and then enters the bromine production process.

[0012] The utility model has the advantages that:

[0013] The utility model provides a waste gas washing device for bromine production, which uses alkali and brine to cooperate to treat tail gas, can recover related substances while ensuring the tail gas treatment effect, and greatly reduces the treatment cost. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The utility model is a structural schematic view;

[0015] In the figure: 1, alkali tank, 2, alkali pump, 3, flowmeter, 4, electromagnetic valve, 5, tail gas absorption tower, 6, PH detector, 7, hand valve, 8, brine pump, 9, vent pipe, 10, brine outlet pipe, 11, brine inlet pipe, 12, alkali delivery pipe, 13, blowout tower, 14, oxidation tower. DETAILED DESCRIPTION

[0016] The utility model will be further described below by examples and in conjunction with the drawings, but is not limited to this.

[0017] Example 1:

[0018] For example, Figure 1As shown, the embodiment provides a waste gas washing device for bromine production, which comprises an alkali tank 1, an alkali pump 2, a tail gas absorption tower 5, an oxidation tower 14, a blowing tower 13 and a brine pump 8, wherein the alkali tank 1 is connected with the tail gas absorption tower 5 through the alkali pump 2, the tail gas absorption tower 5 is provided with a vent pipe 9 at the top, the brine pump 8 is connected with the oxidation tower 14 through a brine inlet pipe 11, the oxidation tower 14 is connected with the tail gas absorption tower 5 through a brine outlet pipe 10 at the bottom, and the blowing tower 13 is connected with the tail gas absorption tower 5 and the oxidation tower 14 at the top. The blowing tower is a device in the air blowing bromine production process, and the utility model is connected with the blowing tower, so that the liquid after tail gas treatment can be directly recycled.

[0019] A flow meter 3 and an electromagnetic valve 4 are arranged on an alkali liquid conveying pipe 12 between the alkali pump 2 and the tail gas absorption tower 5, so as to monitor and control the alkali liquid conveying flow.

[0020] A PH detector 6 and a hand valve 7 are arranged on the brine outlet pipe 10 between the oxidation tower 14 and the tail gas absorption tower 5, so as to monitor the PH value of the brine and control the flow.

[0021] The tail gas absorption tower 5 is provided with a filler.

[0022] In use, the tail gas absorption tower is connected with the tail gas generated in the bromine production process, large-scale bromine production is carried out, when the tail gas discharge capacity is large, alkali liquid absorption is adopted, the alkali pump is started, the alkali liquid in the alkali tank is pumped into the tail gas absorption tower, the chlorine gas and the bromine gas in the tail gas are adsorbed, the alkali liquid adsorbing the chlorine gas and the bromine gas is discharged into the blowing tower and reenters the bromine production process, so that the chlorine gas and the bromine gas are recycled, and the treated tail gas is discharged into the atmosphere through the vent pipe;

[0023] When the bromine production capacity is small and the tail gas discharge capacity is small, brine absorption is adopted, the brine pump is opened, the external brine enters the tail gas absorption tower after passing through the oxidation tower, the chlorine gas and the bromine gas in the tail gas are adsorbed, and then the brine enters the bromine production process, the brine itself is a bromine production material, so that the tail gas is first absorbed and then enters the bromine production, not only the material is recycled and the alkali liquid cost is saved, but also the chlorine gas and the bromine gas are recycled, and the application effect is remarkable.

[0024] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and modifications can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A waste gas scrubbing device for bromine production, characterized by, The alkali tank, the alkali pump, the tail gas absorption tower, the oxidation tower, the blowing tower and the brine pump are connected, the alkali tank is connected with the tail gas absorption tower through the alkali pump, the tail gas absorption tower is provided with a vent pipe at the top, the brine pump is connected with the oxidation tower, the oxidation tower is connected with the tail gas absorption tower at the bottom, and the oxidation tower and the tail gas absorption tower are both connected with the blowing tower.

2. The off-gas washing device for bromine production according to claim 1, characterized by, The flow meter and the electromagnetic valve are arranged between the alkali pump and the tail gas absorption tower.

3. The off-gas washing device for bromine production according to claim 1, characterized by, The PH detector and the hand valve are arranged between the oxidation tower and the tail gas absorption tower.

4. The off-gas washing device for bromine production according to claim 1, characterized by, The packing is arranged in the tail gas absorption tower.

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