Waste acid treatment device for producing hydrogen sulfide based on anaerobic tank

Abstract

The utility model relates to the technical field of chemical process, in particular to a waste acid treatment device based on hydrogen sulfide produced by an anaerobic pool, the device is provided with an anaerobic pool, a waste acid pool, a reaction tower and a solid-liquid separation component, the solid-liquid separation component comprises a filter press, a filtrate tank and a solid tank, the reaction tower is provided with a gas inlet pipe, a liquid inlet pipe and a discharge pipe, and the discharge pipe is provided with a gas outlet pipe. The gas inlet pipe is connected with the anaerobic tank, the liquid inlet pipe is connected with the waste acid tank, the discharging pipe is connected with the feeding end of the filter press, the solid discharging end of the filter press is connected with the solid tank, and the liquid discharging end of the filter press is connected with the filtrate tank; thus, waste acid is fed into the reaction tower through the liquid inlet pipe, excessive hydrogen sulfide waste gas is fed into the reaction tower through the gas inlet pipe, so that excessive hydrogen sulfide and sulfuric acid react in the reaction tower to generate solid sulfur and water, then the solid sulfur and waste liquid are separated through the filter press, the solid sulfur is fed into the solid tank to be recycled, and the waste liquid is fed into the filtrate tank. The waste acid is treated by hydrogen sulfide, solid sulfur is produced, and sulfur dioxide is not produced in the process.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical process, in particular to a waste acid treatment device based on anaerobic pool to produce hydrogen sulfide. Background Art

[0002] With the continuous deepening of my country's industrialization, in order to achieve the scale effect of economic development, various places have established industrial parks in the form of high-tech development zones, science and technology parks, etc., involving industries such as pharmaceutical synthesis, printing and dyeing, and food processing; at the same time, the discharge of various industrial wastewaters is increasing. These industrial wastewaters contain a large amount of organic matter. In order to remove these organic matter, industrial wastewater is usually sent to anaerobic tanks, where anaerobic bacteria in the anaerobic tanks hydrolyze the organic matter, and this process will produce foul-smelling gases such as hydrogen sulfide; at the same time, a large amount of waste acid is also produced every day in industrial parks, and the main component of these waste acids is high-concentration sulfuric acid.

[0003] In the prior art, waste acid is usually processed through high-temperature cracking, purification, conversion, dry absorption and other steps to produce sulfuric acid. The process of high-temperature cracking of waste acid consumes a large amount of heat. In order to provide the large amount of heat required in the high-temperature cracking of waste acid, hydrogen sulfide waste gas is usually used as fuel for the cracking of waste acid.

[0004] However, a large amount of sulfur dioxide will be produced when hydrogen sulfide waste gas is burned. In order to prevent sulfur dioxide from polluting the environment, the industrial park also needs to purify the sulfur dioxide in the waste gas before discharging it. Utility Model Content

[0005] In view of this, it is necessary to provide a waste acid treatment device based on anaerobic tanks to produce hydrogen sulfide, so as to reduce the amount of sulfur dioxide produced when using hydrogen sulfide waste gas to treat waste acid.

[0006] The utility model provides a waste acid treatment device based on producing hydrogen sulfide in an anaerobic tank, comprising an anaerobic tank, a waste acid tank, a reaction tower and a solid-liquid separation component, wherein the solid-liquid separation component comprises a filter press, a filtrate tank and a solid tank, an air inlet pipe, a liquid inlet pipe and a discharge pipe are arranged on the reaction tower, the air inlet pipe is connected with the anaerobic tank, the liquid inlet pipe is connected with the waste acid tank, the discharge pipe is connected with the feed end of the filter press, the solid discharge end of the filter press is connected with the solid tank, and the liquid discharge end is connected with the filtrate tank; the waste acid tank is used to store waste acid generated in daily production in an industrial park, the liquid inlet pipe is used to send waste acid in the waste acid tank into the reaction tower, the air inlet pipe is used to send hydrogen sulfide waste gas generated in the anaerobic tank into the reaction tower, so as to generate solid sulfur and water in the reaction tower through the reaction of excess hydrogen sulfide and sulfuric acid, and the filter press is used to separate the solid sulfur and waste liquid generated in the reaction tower and send them to the solid tank and the filtrate tank respectively.

[0007] Preferably, the waste acid treatment device based on the production of hydrogen sulfide in an anaerobic tank further comprises a drying tower, and both ends of the drying tower are respectively connected to the anaerobic tank and the air inlet pipe to remove water vapor in the hydrogen sulfide waste gas.

[0008] Preferably, the waste acid treatment device based on anaerobic tank for producing hydrogen sulfide further comprises a waste liquid recovery component and a control terminal, the filtrate tank is provided with a first liquid outlet and a second liquid outlet, and the filtrate tank is also provided with a sulfuric acid concentration meter; the waste liquid recovery component comprises a liquid circulation pump and a wastewater tank, the liquid inlet end of the liquid circulation pump is connected to the first liquid outlet, the liquid outlet end is connected to the reaction tower, a first water valve is provided on the pipeline between the liquid inlet end of the liquid circulation pump and the first liquid outlet; the liquid inlet end of the wastewater tank is connected to the second liquid outlet, a second water valve is provided on the pipeline between the liquid inlet end of the wastewater tank and the second liquid outlet, and the control terminal is electrically connected to the first water valve, the second water valve and the sulfuric acid concentration meter;

[0009] The sulfuric acid concentration meter is used to detect the sulfuric acid concentration of the waste liquid in the filtrate tank and send the sulfuric acid concentration data to the control terminal. The control terminal is used to determine the opening and closing of the first water valve or the second water valve according to the sulfuric acid concentration of the waste liquid in the current filtrate tank. The liquid circulation pump is used to return the waste liquid with higher sulfuric acid concentration to the reaction tower to participate in the reaction again. The wastewater tank is used to store waste liquid with lower sulfuric acid concentration.

[0010] Preferably, the waste acid treatment device based on anaerobic tank for producing hydrogen sulfide further comprises a waste gas tower, the reaction tower is also equipped with a gas outlet pipe and a sulfur dioxide detector, the gas outlet pipe is connected to the waste gas tower, the pipeline connecting the gas outlet pipe and the waste gas tower is equipped with a first gas valve, the pipeline connecting the gas inlet pipe and the anaerobic tank is equipped with a second gas valve, and the liquid inlet pipe is equipped with a third water valve; the control terminal is electrically connected to the sulfur dioxide detector, the first gas valve, the second gas valve and the third water valve;

[0011] The sulfur dioxide detector is used to detect the sulfur dioxide concentration in the reaction tower and send the sulfur dioxide concentration data to the control terminal, and the control terminal is used to control the opening and closing of the first gas valve, the second gas valve and the third water valve according to the sulfur dioxide concentration data.

[0012] Preferably, the waste acid treatment device based on anaerobic tank production of hydrogen sulfide also includes a gas circulation pump, the air inlet end of the gas circulation pump is connected to the top of the reaction tower, and the air outlet end is connected to the air inlet pipe, so as to extract the hydrogen sulfide that has not reacted with sulfuric acid from the top of the reaction tower and send it into the reaction tower again.

[0013] Preferably, the air inlet pipe is arranged at the bottom end of the reaction tower, and the liquid inlet pipe is arranged in the middle of the reaction tower, so that the hydrogen sulfide waste gas is passed into the waste acid from the bottom of the waste acid, so that the hydrogen sulfide and the waste acid are fully in contact.

[0014] Preferably, a spray nozzle is provided at the top of the reaction tower, the spray nozzle is connected to the liquid inlet pipe, and the air inlet pipe is arranged at the bottom of the reaction tower, so that hydrogen sulfide and waste acid can be fully contacted by spraying.

[0015] The above-mentioned waste acid treatment device based on anaerobic tank for producing hydrogen sulfide is provided with an anaerobic tank, a waste acid tank, a reaction tower and a solid-liquid separation component, wherein the solid-liquid separation component comprises a filter press, a filtrate tank and a solid tank, and an air inlet pipe, a liquid inlet pipe and a discharge pipe are provided on the reaction tower, wherein the air inlet pipe is connected to the anaerobic tank, the liquid inlet pipe is connected to the waste acid tank, the discharge pipe is connected to the feed end of the filter press, the solid discharge end of the filter press is connected to the solid tank, and the liquid discharge end is connected to the filtrate tank; in this way, the waste acid is sent into the reaction tower through the liquid inlet pipe , and send excess hydrogen sulfide waste gas into the reaction tower through the air inlet pipe, so that excess hydrogen sulfide and sulfuric acid react in the reaction tower to generate solid sulfur and water, and then separate the solid sulfur and waste liquid through the filter press, send the solid sulfur to the solid tank for recovery, and send the waste liquid to the filtrate tank, so that the waste acid is treated with hydrogen sulfide to produce solid sulfur. No sulfur dioxide will be generated in this process. Even when the hydrogen sulfide is not excessive, only a small amount of sulfur dioxide will be generated, thereby reducing the amount of sulfur dioxide generated. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the waste acid treatment device based on anaerobic tank to produce hydrogen sulfide in the present application.

[0017] Figure 2 It is a schematic diagram of a reaction tower in the first embodiment of the present application.

[0018] Figure 3 It is a schematic diagram of a reaction tower in the second embodiment of the present application.

[0019] In the figure: a waste acid treatment device 10 based on anaerobic tank for producing hydrogen sulfide, an anaerobic tank 20, a waste acid tank 30, a reaction tower 40, an air inlet pipe 41, a liquid inlet pipe 42, a discharge pipe 43, an air outlet pipe 44, a sulfur dioxide detector 45, a spray nozzle 46, a solid-liquid separation component 50, a filter press 51, a filtrate tank 52, a sulfuric acid concentration meter 521, a solid tank 53, a drying tower 60, a waste liquid recovery component 70, a liquid circulation pump 71, a wastewater tank 72, a waste gas tower 80, and a gas circulation pump 90. DETAILED DESCRIPTION

[0020] The technical scheme and technical effects of the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings of the present invention.

[0021] Please refer to Figure 1The utility model provides a waste acid treatment device 10 based on the production of hydrogen sulfide in an anaerobic tank 20, comprising an anaerobic tank 20, a waste acid tank 30, a reaction tower 40 and a solid-liquid separation component 50, the solid-liquid separation component 50 comprising a filter press 51, a filtrate tank 52 and a solid tank 53, an air inlet pipe 41, a liquid inlet pipe 42 and a discharge pipe 43 are arranged on the reaction tower 40, the air inlet pipe 41 is connected to the anaerobic tank 20, the liquid inlet pipe 42 is connected to the waste acid tank, the discharge pipe 43 is connected to the feed end of the filter press 51, the solid discharge end of the filter press 51 is connected to the solid tank 53, and the liquid discharge end is connected to the filtrate tank 52; the waste acid tank is used to store daily The waste acid generated in the normal production, the liquid inlet pipe 42 is used to send the waste acid in the waste acid pool into the reaction tower 40, the air inlet pipe 41 is used to send the hydrogen sulfide waste gas generated in the anaerobic tank 20 into the reaction tower 40, so that the excess hydrogen sulfide and sulfuric acid react in the reaction tower 40 to produce solid sulfur and water, the filter press 51 is used to separate the solid sulfur and the waste liquid and send them to the solid tank 53 and the filtrate tank 52 respectively, so that the excess hydrogen sulfide and sulfuric acid in the waste acid are reacted to fully recover the sulfur in the hydrogen sulfide and the waste acid to produce solid sulfur, and no sulfur dioxide is generated in this process, wherein the chemical reaction formula of hydrogen sulfide and sulfuric acid is 3H 2 S+H 2 SO 4 ==4H 2 O+3S↓.

[0022] In this embodiment, the waste acid treatment device 10 for producing hydrogen sulfide based on the anaerobic tank 20 also includes a drying tower 60, and both ends of the drying tower 60 are respectively connected to the anaerobic tank 20 and the air inlet pipe 41 to remove water vapor in the hydrogen sulfide waste gas, so that the hydrogen sulfide concentration in the hydrogen sulfide waste gas entering the reaction tower 40 is higher.

[0023] In this embodiment, the waste acid treatment device 10 based on the anaerobic tank for producing hydrogen sulfide also includes a waste liquid recovery component 70 and a control terminal. The filtrate tank 52 is provided with a first liquid outlet and a second liquid outlet, and the filtrate tank 52 is also provided with a sulfuric acid concentration meter 521. The waste liquid recovery component includes a liquid circulation pump 71 and a wastewater tank 72. The liquid inlet end of the liquid circulation pump 71 is connected to the first liquid outlet, and the liquid outlet end is connected to the reaction tower 40. A first water valve is installed on the pipeline between the liquid inlet end of the liquid circulation pump 71 and the first liquid outlet; the liquid inlet end of the wastewater tank 72 is connected to the second liquid outlet, and a second water valve is installed on the pipeline between the liquid inlet end of the wastewater tank 72 and the second liquid outlet; the control terminal is electrically connected to the first water valve, the second water valve and the sulfuric acid concentration meter 521;

[0024] When the reaction tower 40 discharges the waste liquid after the reaction into the filter press 51 , part of the unreacted sulfuric acid is also brought into the filter press 51 by the waste liquid, and is finally sent into the filtrate tank 52 from the liquid discharge end of the filter press 51 .

[0025] The sulfuric acid concentration meter 521 is used to detect the sulfuric acid concentration of the waste liquid in the filtrate tank 52 and send the sulfuric acid concentration data to the control terminal. The control terminal is used to determine the opening and closing of the first water valve or the second water valve according to the sulfuric acid concentration of the waste liquid in the current filtrate tank 52. When the sulfuric acid brought into the filtrate tank 52 by the waste liquid is large, the control terminal opens the first water valve and closes the second water valve, and sends the sulfuric acid back to the reaction tower 40 through the liquid circulation pump 71 to participate in the reaction again, and the incompletely reacted sulfuric acid is recycled; when the sulfuric acid brought into the filtrate tank 52 by the waste liquid is small, the control terminal opens the second water valve and closes the first water valve, and sends the waste liquid containing less sulfuric acid to the wastewater pool 72 for subsequent purification treatment.

[0026] In this embodiment, the waste acid treatment device 10 based on the anaerobic tank 20 producing hydrogen sulfide further includes a waste gas tower 80, and the reaction tower 40 is also equipped with an outlet pipe 44 and a sulfur dioxide detector 45, the outlet pipe 44 is connected to the waste gas tower 80, and the pipeline connecting the outlet pipe 44 and the waste gas tower 80 is equipped with a first air valve, the pipeline connecting the air inlet pipe 41 and the anaerobic tank 20 is equipped with a second air valve, and the liquid inlet pipe 42 is equipped with a third water valve; the control terminal is electrically connected to the sulfur dioxide detector 45, the first air valve, the second air valve and the third water valve;

[0027] The sulfur dioxide detector 45 is used to detect the sulfur dioxide concentration in the reaction tower 40 and send the sulfur dioxide concentration data to the control terminal, and the control terminal is used to determine the opening and closing of the first gas valve, the second gas valve and the third water valve according to the sulfur dioxide concentration coefficient;

[0028] When sulfur dioxide is not produced in the reaction tower 40, the first air valve is in a closed state, the second air valve and the third water valve are in an open state, and the hydrogen sulfide waste gas and waste acid continue to react in the reaction tower 40 to produce solid sulfur and water; when the hydrogen sulfide waste gas in the reaction tower 40 is insufficient, the hydrogen sulfide waste gas and waste acid react to produce sulfur dioxide. At the same time, the sulfur dioxide concentration data detected by the sulfur dioxide detector 45 is sent to the control terminal, and the control terminal controls the second air valve and the third water valve to close and opens the first air valve, so that the generated sulfur dioxide is sent to the waste gas tower 80 to wait for subsequent processing. After all the sulfur dioxide in the reaction tower 40 is discharged, the control terminal controls the first air valve to close and opens the second air valve and the third water valve to continue to pass the hydrogen sulfide waste gas and waste acid into the reaction tower 40 for reaction.

[0029] Furthermore, the waste acid treatment device based on the production of hydrogen sulfide in an anaerobic tank also includes a gas circulation pump 90, the air inlet end of the gas circulation pump 90 is connected to the top of the reaction tower, and the air outlet end is connected to the air inlet pipe, so as to extract the hydrogen sulfide that has not reacted with sulfuric acid from the top of the reaction tower and send it into the reaction tower again.

[0030] Please refer to Figure 2In the first embodiment, the air inlet pipe 41 is arranged at the bottom end of the reaction tower 40, and the liquid inlet pipe 42 is arranged in the middle of the reaction tower 40, so as to pass the hydrogen sulfide waste gas into the waste acid from the bottom of the waste acid. The hydrogen sulfide waste gas is fully contacted with the sulfuric acid in the waste acid during the rising process, thereby increasing the contact time and contact area of ​​hydrogen sulfide and sulfuric acid, allowing hydrogen sulfide and sulfuric acid to react fully and shortening the reaction time.

[0031] Please refer to Figure 3 In the second embodiment, a spray nozzle 46 is provided at the top of the reaction tower 40, the spray nozzle 46 is connected to the liquid inlet pipe 42, and the air inlet pipe 41 is provided at the bottom of the reaction tower 40, so that the hydrogen sulfide waste gas and the waste acid can be fully contacted by spraying, so that the sulfuric acid in the waste acid and the hydrogen sulfide in the hydrogen sulfide waste gas can be fully contacted, thereby shortening the reaction time.

[0032] The utility model produces solid sulfur by reacting excess hydrogen sulfide with sulfuric acid in waste acid, fully recovers sulfur element in hydrogen sulfide waste gas and waste acid, and basically does not generate sulfur dioxide waste gas in the process.

[0033] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A waste acid treatment device based on anaerobic tank to produce hydrogen sulfide, characterized in that: It includes an anaerobic tank, a waste acid tank, a reaction tower and a solid-liquid separation component, the solid-liquid separation component includes a filter press, a filtrate tank and a solid tank, the reaction tower is provided with an air inlet pipe, a liquid inlet pipe and a discharge pipe, the air inlet pipe is connected to the anaerobic tank, the liquid inlet pipe is connected to the waste acid tank, the discharge pipe is connected to the feed end of the filter press, the solid discharge end of the filter press is connected to the solid tank, and the liquid discharge end is connected to the filtrate tank; the waste acid tank is used to store waste acid generated in daily production in the industrial park, the liquid inlet pipe is used to send the waste acid in the waste acid tank into the reaction tower, the air inlet pipe is used to send the hydrogen sulfide waste gas generated in the anaerobic tank into the reaction tower, so as to generate solid sulfur and water in the reaction tower through the reaction of excess hydrogen sulfide and sulfuric acid, and the filter press is used to separate the solid sulfur and waste liquid generated in the reaction tower and send them to the solid tank and the filtrate tank respectively.

2. The waste acid treatment device based on anaerobic tank producing hydrogen sulfide according to claim 1, characterized in that: The waste acid treatment device based on producing hydrogen sulfide in an anaerobic tank also includes a drying tower, and both ends of the drying tower are respectively connected to the anaerobic tank and the air inlet pipe to remove water vapor in the hydrogen sulfide waste gas.

3. The waste acid treatment device based on anaerobic tank for producing hydrogen sulfide according to claim 1, characterized in that: The waste acid treatment device based on anaerobic tank for producing hydrogen sulfide also includes a waste liquid recovery component and a control terminal. The filtrate tank is provided with a first liquid outlet and a second liquid outlet, and the filtrate tank is also provided with a sulfuric acid concentration meter; the waste liquid recovery component includes a liquid circulation pump and a wastewater tank, the liquid inlet end of the liquid circulation pump is connected to the first liquid outlet, and the liquid outlet end is connected to the reaction tower, and a first water valve is provided on the pipeline between the liquid inlet end of the liquid circulation pump and the first liquid outlet; the liquid inlet end of the wastewater tank is connected to the second liquid outlet, and the liquid inlet end of the wastewater tank is connected to the second liquid outlet. A second water valve is installed on the pipeline between the first and second liquid outlets, and the control terminal is electrically connected to the first water valve, the second water valve and the sulfuric acid concentration meter; the sulfuric acid concentration meter is used to detect the sulfuric acid concentration of the waste liquid in the filtrate tank and send the sulfuric acid concentration data to the control terminal, and the control terminal is used to determine the opening and closing of the first water valve or the second water valve according to the sulfuric acid concentration of the waste liquid in the current filtrate tank, the liquid circulation pump is used to return the waste liquid with higher sulfuric acid concentration to the reaction tower to participate in the reaction again, and the wastewater tank is used to store the waste liquid with lower sulfuric acid concentration.

4. The waste acid treatment device based on anaerobic tank for producing hydrogen sulfide according to claim 3, characterized in that: The waste acid treatment device based on anaerobic tank for producing hydrogen sulfide also includes a waste gas tower, and the reaction tower is also equipped with an outlet pipe and a sulfur dioxide detector, the outlet pipe is connected to the waste gas tower, the pipeline connecting the outlet pipe and the waste gas tower is equipped with a first air valve, the pipeline connecting the air inlet pipe and the anaerobic tank is equipped with a second air valve, and the liquid inlet pipe is equipped with a third water valve; the control terminal is electrically connected to the sulfur dioxide detector, the first air valve, the second air valve and the third water valve; the sulfur dioxide detector is used to detect the sulfur dioxide concentration in the reaction tower and send the sulfur dioxide concentration data to the control terminal, and the control terminal is used to control the opening and closing of the first air valve, the second air valve and the third water valve according to the sulfur dioxide concentration data.

5. The waste acid treatment device based on anaerobic tank producing hydrogen sulfide according to claim 1, characterized in that: The waste acid treatment device based on producing hydrogen sulfide in an anaerobic tank also includes a gas circulation pump, the air inlet end of the gas circulation pump is connected to the top of the reaction tower, and the air outlet end is connected to the air inlet pipe, so as to extract the hydrogen sulfide that has not reacted with sulfuric acid from the top of the reaction tower and send it back into the reaction tower.

6. The waste acid treatment device based on anaerobic tank for producing hydrogen sulfide according to claim 5, characterized in that: The air inlet pipe is arranged at the bottom end of the reaction tower, and the liquid inlet pipe is arranged in the middle of the reaction tower, so as to pass the hydrogen sulfide waste gas into the waste acid from the bottom of the waste acid, so that the hydrogen sulfide and the waste acid are fully contacted.

7. The waste acid treatment device based on anaerobic tank for producing hydrogen sulfide according to claim 5, characterized in that: A spray nozzle is provided at the top of the reaction tower, the spray nozzle is connected to the liquid inlet pipe, and the air inlet pipe is arranged at the bottom of the reaction tower, so that hydrogen sulfide and waste acid can be fully contacted by spraying.

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