Acid-containing wastewater purification and concentration device

Abstract

The utility model discloses an acid-containing wastewater purification and concentration device, and aims to overcome the defects of low efficiency and higher cost of the conventional acid-containing wastewater treatment mode. The steam stripping device comprises a steam stripping part and an evaporation part, the evaporation part comprises a preheating effect body, a vacuum evaporation effect body and a vacuum pump which are sequentially connected, the steam stripping part comprises a steam stripping effect body and a condenser, a gas outlet of the vacuum evaporation effect body is connected with the steam stripping effect body, and the steam stripping effect body separates water from steam stripping materials through the condenser. And the condenser exchanges heat with the wastewater before entering the steam stripping effect body. Through the combination of the steam stripping part and the evaporation part, hydrogen sulfide in the wastewater is fully consumed and converted into sulfuric acid, and the concentration of the wastewater reaches the reuse standard by concentrating the waste liquid.

Description

Technical Field

[0001] The utility model relates to the field of environmental protection, and more specifically, to a device for purifying and concentrating acid-containing wastewater. Background Art

[0002] Wastewater is generated in industrial production. Direct discharge of this wastewater will damage the environment, cause waste of materials, and lead to loss of economic benefits.

[0003] For sulfuric acid and hydrogen sulfide wastewater, the commonly used treatment method is chemical treatment by aeration oxidation, but this method has low efficiency, large gas consumption, and the sulfuric acid content in the generated wastewater is low, which is not enough for reuse.

[0004] The present application aims to provide a device for purifying and concentrating acid-containing wastewater, which can treat wastewater efficiently and economically. Summary of the invention

[0005] The utility model overcomes the shortcomings of low efficiency and high cost of existing treatment methods, and provides a device for purifying and concentrating acid-containing wastewater, which can purify wastewater and improve the efficiency and economy of wastewater treatment.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A device for purifying and concentrating acid-containing wastewater comprises a stripping section and an evaporation section, wherein the evaporation section comprises a preheating effect, a vacuum evaporation effect and a vacuum pump which are connected in sequence, and the stripping section comprises a stripping effect and a condenser, wherein the gas outlet of the vacuum evaporation effect is connected to the stripping effect, the stripping effect separates water and stripping materials through the condenser, and the condenser exchanges heat with the wastewater before entering the stripping effect.

[0008] The stripping section is used to extract hydrogen sulfide. The evaporation section is used to concentrate wastewater. The concentrated wastewater is low-pressured by a vacuum pump to reduce the boiling point of the wastewater to save energy. The steam generated by the vacuum evaporation effect is used as the stripping water vapor to enter the stripping medium of the stripping section. The condenser is then used to separate the water vapor and hydrogen sulfide to extract hydrogen sulfide. Heat is exchanged in the process to preheat the wastewater with heat, thereby further saving energy.

[0009] Preferably, the stripping section further comprises a combustion chamber, and the separation chamber of the condenser is connected to the combustion chamber through a gas exhaust pipe. Since the content of hydrogen sulfide is relatively small, it is not economical to configure a sulfur production process for this purpose, so direct combustion oxidation is used for treatment.

[0010] As a preferred embodiment, the combustion chamber exchanges heat with the wastewater before entering the stripping effect body through a heat exchanger, and the heat generated by the combustion is used to preheat the wastewater through heat exchange, thereby further saving energy.

[0011] Preferably, the evaporation section further comprises a recovery pool, and the combustion chamber is connected to the recovery pool to absorb the gas generated by the combustion chamber. Combustion will produce sulfur dioxide and water, which can be introduced into the purified wastewater to increase the concentration of sulfuric acid with oxidation.

[0012] Preferably, the combustion chamber is connected to the bottom of the recovery tank to increase the residence time of the gas in the liquid of the recovery tank and achieve full absorption of the combustion gas.

[0013] Preferably, the stripping section further comprises a condenser, which is connected to the water outlet of the condenser.

[0014] Preferably, the vacuum evaporation effector is a forced falling film evaporator.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] Through the combination of the stripping section and the evaporation section, the hydrogen sulfide in the wastewater is fully consumed and converted into sulfuric acid, and the waste liquid is concentrated so that the concentration of the wastewater reaches the reuse standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the utility model;

[0018] In the figure:

[0019] Preheating effect 1, vacuum evaporation effect 2, vacuum pump 3, stripping effect 4, condenser 5, combustion chamber 6, recovery tank 7, condensation tank 8. DETAILED DESCRIPTION

[0020] The present disclosure is further described below in conjunction with the accompanying drawings and embodiments.

[0021] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0022] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0023] In the present disclosure, terms such as "fixed connection", "connected", "connection", etc. should be understood in a broad sense, indicating that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. For relevant scientific research or technical personnel in this field, the specific meanings of the above terms in the present disclosure can be determined according to specific circumstances, and they cannot be understood as limitations on the present disclosure.

[0024] Example:

[0025] A device for purifying and concentrating acid-containing wastewater comprises a stripping part and an evaporation part.

[0026] Ginseng Figure 1 , wherein the dotted line is the heating route, which only indicates the heat transfer relationship and does not indicate the corresponding pipeline. The evaporation section includes a preheating effect 1, a vacuum evaporation effect 2 and a vacuum pump 3 connected in sequence. Among them, the vacuum evaporation effect 2 is a forced falling film evaporator. The concentrated wastewater is low-pressured by the vacuum pump 3 to reduce the boiling point in the wastewater to save energy. The vacuum evaporation effect 2 includes a main body of the vacuum evaporation effect 2 and a separation chamber for separating the liquid phase and the gas, and the water vapor is separated by the separation chamber. The evaporation section also includes a recovery tank 7, and the combustion chamber 6 is connected to the recovery tank 7 to absorb the gas generated by the combustion chamber 6. Combustion will produce sulfur dioxide and water, which can increase the concentration of sulfuric acid by passing into the purified wastewater accompanied by oxidation. The stripping section also includes a condensation tank 8, which is connected to the water outlet of the condenser 5.

[0027] The stripping section includes a stripping effect 4 and a condenser 5. The gas outlet of the vacuum evaporation effect 2 is connected to the stripping effect 4. The stripping effect 4 separates water and stripping materials through the condenser 5. The condenser 5 exchanges heat with the wastewater before entering the stripping effect 4. The stripping section also includes a combustion chamber 6. The separation chamber of the condenser 5 is used to connect the combustion chamber 6 through a gas exhaust pipe. Since the content of hydrogen sulfide is relatively small, it is not economical to configure a sulfur production process for this purpose. Therefore, direct combustion oxidation is used for treatment. The combustion chamber 6 exchanges heat with the wastewater before entering the stripping effect 4 through a heat exchanger. The heat generated by combustion is used to preheat the wastewater through heat exchange, further saving energy. Among them, the combustion chamber 6 is connected to the bottom of the recovery tank 7 to increase the time that the gas stays in the liquid in the recovery tank 7, so as to achieve full absorption of the combustion gas.

[0028] The stripping section is used to extract hydrogen sulfide. The evaporation section is used to concentrate wastewater. The steam generated by the vacuum evaporation effect 2 is used as the stripping water vapor to enter the stripping medium of the stripping section. The condenser 5 is then used to separate the water vapor and hydrogen sulfide, extract the hydrogen sulfide, and perform heat exchange in the process, and use the heat to preheat the wastewater, thereby further saving energy.

[0029] The whole process is as follows: the wastewater is heated by the condenser 5 and the combustion chamber 6 to achieve temperature increase and improve the stripping effect. The wastewater separated from the hydrogen sulfide enters the preheating effect 1, and then enters the vacuum evaporation effect 2 for evaporation. The generated liquid enters the recovery pool, and the water vapor generated by evaporation enters the stripping effect 2 to strip the hydrogen sulfide.

[0030] The stripped gas is liquefied through the condenser 5 to separate the hydrogen sulfide, which is then sent to the combustion chamber for heat supply and the generated gas is passed to the recovery tank. The condensed water is sent to the condensation tank 8 for use in the previous process. The concentrated sulfuric acid generated in the recovery tank 7 is sent to the previous process for use.

[0031] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A device for purifying and concentrating acidic wastewater, characterized in that: It includes a stripping part and an evaporation part. The evaporation part includes a preheating effect, a vacuum evaporation effect and a vacuum pump which are connected in sequence. The stripping part includes a stripping effect and a condenser. The air outlet of the vacuum evaporation effect is connected to the stripping effect. The stripping effect separates water and stripping materials through the condenser. The condenser exchanges heat with the wastewater before entering the stripping effect.

2. The acid-containing wastewater purification and concentration device according to claim 1 is characterized in that: The stripping section further comprises a combustion chamber, a separation chamber of a condenser and an exhaust pipe for passing gas connected to the combustion chamber.

3. The acid-containing wastewater purification and concentration device according to claim 2 is characterized in that: The combustion chamber exchanges heat with the wastewater before entering the stripping effect body through a heat exchanger.

4. The acid-containing wastewater purification and concentration device according to claim 2 is characterized in that: The evaporation part also includes a recovery pool, and the combustion chamber is connected to the recovery pool to absorb the gas generated by the combustion chamber.

5. The acid-containing wastewater purification and concentration device according to claim 4 is characterized in that: The combustion chamber is connected to the bottom of the recovery tank.

6. The acid-containing wastewater purification and concentration device according to claim 1 is characterized in that: The stripping part also includes a condensing tank, which is connected to the water outlet of the condenser.

7. The acid wastewater purification and concentration device according to any one of claims 1 to 6, characterized in that: The vacuum evaporation effect is a forced falling film evaporator.

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