System for removing carbonate in wastewater and preparing pure carbon dioxide gas

Abstract

The utility model discloses a system for removing carbonate radicals from wastewater and preparing pure carbon dioxide gas, which has the advantages that the operation energy consumption is reduced, the treated carbon dioxide can be directly utilized, and the greenhouse effect is reduced. The acid adding reaction storage tank comprises a tank body, an acid flow inlet, a wastewater inlet and a wastewater flow outlet; a lifting pump is integrated at an inlet of the wastewater circulation pipeline, and a plurality of security filters are arranged on the wastewater circulation pipeline in the wastewater circulation direction; the decarburization membrane contactor comprises a contactor body, a wastewater inlet, a wastewater outlet, a purging liquid inlet and a purging liquid outlet, the alcohol amine circulating tank comprises a top outlet, a top reflux inlet, a bottom flow inlet and a bottom discharge port; an alcohol amine collecting tank; and the desorption tower comprises a bottom mixing inlet, a top gas outlet and a liquid outlet on one side of the upper part.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of wastewater treatment, specifically is the system of removing carbonate and making pure carbon dioxide gas in wastewater. BACKGROUND

[0002] The existing lithium carbonate wastewater treatment is all first acid adds low PH value, converts carbonate in water into carbon dioxide, then uses the decarburization tower to carry out the treatment, but uses the decarburization tower to carry out the treatment, and when acid adjusts PH, PH must be adjusted to 4 below, and the acid consumption is relatively large, and the steam-water ratio of the decarburization tower reaches 40:1, and the power of the fan is relatively large, and the operation energy consumption is higher, after the decarburization carbon treatment, the carbon dioxide in water can only be treated to about 5mg / L, and the carbon dioxide gas obtained by the prior art treatment cannot be directly utilized because it is mixed in the air, and can only be discharged into the atmosphere, which will increase the greenhouse effect. UTILITY MODEL CONTENTS

[0003] In view of the above problems, the utility model provides the system of removing carbonate and making pure carbon dioxide gas in wastewater, which reduces the operation energy consumption, and the treated carbon dioxide can be directly utilized, reducing the greenhouse effect.

[0004] The system for removing carbonate and making pure carbon dioxide gas in wastewater, characterized in that it comprises:

[0005] The acid reaction storage tank comprises a tank body, an acid inlet, a wastewater inlet and a wastewater outlet.

[0006] The wastewater flow pipeline has a lifting pump integrated at the inlet, and a plurality of safety filters are arranged along the wastewater flow direction.

[0007] The decarburization membrane contactor comprises a contactor body, a wastewater inlet, a wastewater outlet, a purge liquid inlet and a purge liquid outlet.

[0008] The alcohol amine circulating tank comprises a top outlet, a top reflux port, a bottom inlet and a bottom outlet.

[0009] The alcohol amine collecting tank is arranged on the bottom of the alcohol amine circulating tank.

[0010] The desorption tower comprises a bottom mixing inlet, a top gas outlet and a liquid outlet on one side of the upper portion.

[0011] The wastewater outlet is connected to the inlet of the lifting pump, the outlet of the wastewater flow pipeline is connected to the wastewater inlet of the decarbonization membrane contactor, the wastewater outlet of the decarbonization membrane contactor is connected to the treated wastewater outlet pipeline, the top outlet of the alcohol amine circulating tank is connected to the sweep liquid inlet through a pipeline, the sweep liquid outlet is connected to the bottom inlet of the alcohol amine circulating tank after the alcohol amine lifting pump, the bottom outlet is connected to the inlet of the alcohol amine collecting tank, the outlet of the alcohol amine collecting tank is connected to the bottom mixing inlet of the desorption tower, the liquid outlet of the desorption tower is connected to the top reflux inlet of the alcohol amine circulating tank through a reflux pipeline, and the top gas outlet of the desorption tower is connected to the pure carbon dioxide tower gas pipeline.

[0012] Further features are:

[0013] The acid flow inlet is integrated with an acid metering pump, which ensures accurate and reliable metering of the acid;

[0014] The inlet of the alcohol amine collecting tank is located at the top, and the bottom outlet is connected to the inlet of the alcohol amine collecting tank through an alcohol amine discharge pump;

[0015] The outlet of the alcohol amine collecting tank is connected to the bottom mixing inlet of the desorption tower through a desorption tower feed pump, which ensures that the gas-liquid mixture reliably flows into the bottom mixing inlet without backflow.

[0016] After the above technical solution is adopted, the working principle of the membrane contactor is as follows Figure 2The gas transmission membrane material adopted is a material selectively permeable to gas, the membrane contactor is internally provided with a large number of hollow fibers, the wall of the fiber is provided with a plurality of micro-holes, only gas molecules can pass through the micro-holes, gas can pass through the material in two directions, liquid cannot pass through, and gas in the liquid on the outside is converged into the lumen of the fiber by the liquid flow in the lumen, so that the carbon dioxide gas component in the wastewater is reduced, when the device is running, the wastewater containing carbonate is transported to the wastewater inlet of the tank, then enters the tank, sulfuric acid is added to the tank through the acid flow inlet to adjust the PH value of the wastewater, the PH value of the wastewater after the acid is added is controlled to be about 4.5, the wastewater after the acid is adjusted is pressurized by the lifting pump, the pressure is increased to 0.15 MPa, then the wastewater is filtered through the security filter to remove impurities in the wastewater, so that the turbidity of the wastewater is less than 0.1 NTU, then the wastewater enters the decarburization membrane contactor, the alcohol amine solution enters the blowing liquid inlet, the alcohol amine solution flows quickly along the lumen of the fiber to generate flow pressure, the carbon dioxide gas in the wastewater passes through the membrane material and converges into the alcohol amine solution, is reacted and absorbed by the alcohol amine solution, the alcohol amine solution flows out from the blowing liquid outlet, the wastewater after the carbon dioxide is removed is discharged through the treated wastewater outlet pipeline, at this time, the content of the dissolved carbon dioxide in the wastewater is less than 0.5 mg / L, at this time, the PH value of the wastewater is increased to about 6.3, and the wastewater can be directly subjected to the next step without being adjusted by adding alkali again, the alcohol amine solution after the carbon dioxide is absorbed is recycled to the alcohol amine circulating tank, the saturated alcohol amine solution after the carbon dioxide is absorbed is transferred to the alcohol amine collecting tank, the saturated alcohol amine solution is sent to the desorption tower, the temperature of the desorption tower is controlled to be 120-145 DEG C, the alcohol amine solution after desorption is recycled to the alcohol amine circulating tank for recycling, and the pure carbon dioxide gas generated by desorption is discharged through the top gas outlet and is collected and utilized, energy consumption is reduced during operation, and the treated carbon dioxide can be directly utilized, so that the greenhouse effect is reduced. BRIEF DESCRIPTION OF DRAWINGS

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

[0018] Figure 2 It is a structure schematic diagram of the decarburization membrane contactor adopted by the utility model;

[0019] The names corresponding to the serial numbers in the drawing are as follows:

[0020] acid reaction storage tank 10, tank body 11, acid flow inlet 12, waste water inlet 13, waste water flow outlet 14, acid feeding metering pump 15, waste water flow pipe 20, lifting pump 21, security filter 22, decarbonization membrane contactor 30, contactor body 31, waste water inlet 32, waste water outlet 33, purge liquid inlet 34, purge liquid outlet 35, alcohol amine circulating tank 40, top outlet 41, top reflux port 42, bottom flow inlet 43, bottom discharge outlet 44, alcohol amine lifting pump 45, alcohol amine collecting tank 50, top inlet 51, bottom outlet 52, alcohol amine discharge pump 53, desorption tower 60, bottom mixing inlet 61, top gas outlet 62, liquid flow outlet 63, desorption tower feeding pump 64, treated waste water outlet pipe 70, reflux pipe 80, pure carbon dioxide gas pipe 90. DETAILED DESCRIPTION

[0021] The system for removing carbonate from waste water and producing pure carbon dioxide gas, as shown in Figure 1 : it comprises acid reaction storage tank 10, waste water flow pipe 20, decarbonization membrane contactor 30, alcohol amine circulating tank 40, alcohol amine collecting tank 50, and desorption tower 60;

[0022] The acid reaction storage tank 10 comprises tank body 11, acid flow inlet 12, waste water inlet 13, waste water flow outlet 14;

[0023] The inlet of the waste water flow pipe 20 is integrated with the lifting pump 21, and the waste water flow pipe 20 is provided with a plurality of security filters 22 along the waste water flow direction;

[0024] The decarbonization membrane contactor 30 comprises contactor body 31, waste water inlet 32, waste water outlet 33, purge liquid inlet 34, and purge liquid outlet 35;

[0025] The alcohol amine circulating tank 40 comprises top outlet 41, top reflux port 42, bottom flow inlet 43, and bottom discharge outlet 44;

[0026] The alcohol amine collecting tank 50 comprises top inlet 51 and bottom outlet 52;

[0027] The desorption tower 60 comprises bottom mixing inlet 61, top gas outlet 62, and liquid flow outlet 63 on the upper side;

[0028] The waste water stream outlet 14 is connected to the inlet of the lift pump 21, the outlet of the waste water stream conduit 20 is connected to the waste water inlet 32 of the decarbonization membrane contactor 30, the waste water outlet 33 of the decarbonization membrane contactor 30 is connected to the treated waste water outlet conduit 70, the top outlet 41 of the alcohol amine circulating tank 40 is connected to the purge liquid inlet 34 through a conduit, the purge liquid outlet 35 is connected to the bottom inlet 43 of the alcohol amine circulating tank 40 through an alcohol amine lift pump 45, the bottom outlet 44 is connected to the top inlet 51 of the alcohol amine collecting tank 50 through an alcohol amine discharge pump 53, the bottom outlet 52 of the alcohol amine collecting tank 50 is connected to the bottom mixing inlet 61 of the desorption tower 60 through a desorption tower feed pump 64, the liquid stream outlet 63 of the desorption tower 60 is connected to the top reflux inlet 42 of the alcohol amine circulating tank 40 through a reflux conduit 80, and the top gas outlet 62 of the desorption tower 60 is connected to the purified carbon dioxide gas conduit 90.

[0029] In a specific implementation, the acid stream inlet 12 is integrated with an acid metering pump 15, which ensures that the acid is added accurately and reliably.

[0030] The working principle is as follows, the working principle of the membrane contactor is shown in Figure 2The gas transmission membrane material used is a substance selective permeation material, the membrane contactor is internally provided with a large number of hollow fibers, the wall of the fiber is provided with a micro hole, only gas molecules can pass through the micro hole, the gas can pass through the material in two directions, and the liquid cannot pass through, a gas-liquid contact is established on the surface of the material on both sides, the liquid flow in the lumen of the membrane fiber drives the gas in the liquid outside to converge into the lumen of the membrane fiber, so that the carbon dioxide gas component in the wastewater is reduced, when the whole device is running, the wastewater containing carbonate is transported to the wastewater inlet of the tank body, then enters the tank body, sulfuric acid is added to the tank body through the acid flow inlet, the PH value of the wastewater is adjusted, the PH value of the wastewater after adding acid is controlled to be about 4.5, the wastewater after adjusting the acid is pressurized by the lifting pump, the pressure is increased to 0.15Mpa, then the wastewater is filtered through the security filter, the impurities in the wastewater are removed, the turbidity of the wastewater is less than 0.1NTU, then the wastewater enters the decarburization membrane contactor, the alcohol amine solution enters the blowing liquid inlet, the alcohol amine solution flows quickly along the lumen of the membrane fiber, a flow pressure is generated, the carbon dioxide gas in the wastewater passes through the membrane material and converges into the alcohol amine liquid, is reacted and absorbed by the alcohol amine solution, the alcohol amine liquid flows out from the blowing liquid outlet, the wastewater after removing the carbon dioxide is discharged through the treated wastewater outlet pipeline, at this time, the content of the dissolved carbon dioxide in the wastewater is less than 0.5mg / L, at this time, the PH value of the wastewater is increased to about 6.3, and the wastewater can be directly subjected to the next step of treatment without adding alkali for readjustment; the alcohol amine solution after absorbing the carbon dioxide is circulated back to the alcohol amine circulating tank, the saturated alcohol amine solution after absorbing the carbon dioxide is transferred to the alcohol amine collecting tank, the saturated alcohol amine solution is sent to the desorption tower, the temperature of the desorption tower is controlled to be 120-145 DEG C, the alcohol amine solution after desorption is circulated back to the alcohol amine circulating tank for recycling, and the pure carbon dioxide gas generated by desorption is discharged through the top gas outlet and is collected and utilized.

[0031] It is apparent for those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and the present application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all aspects as illustrative and not restrictive, and the scope of the present application is defined by the appended claims rather than the foregoing description, and it is intended to encompass all changes falling within the meaning and range of equivalents of the elements of the claims. Any reference signs in the claims should not be deemed to limit the claims involved.

[0032] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments which can be understood by those skilled in the art.

Claims

1. A system for removing carbonate from wastewater and producing pure carbon dioxide gas, characterized by, It comprises: an acid adding reaction tank comprising a tank body, an acid flow inlet, a waste water inlet, a waste water flow outlet; a waste water flow pipeline, the inlet of which is integrated with a lifting pump, and the pipeline is provided with a plurality of safety filters along the waste water flow direction; a decarbonization membrane contactor comprising a contactor body, a waste water inlet, a waste water outlet, a purge liquid inlet, and a purge liquid outlet; an alcohol amine circulating tank comprising a top outlet, a top reflux inlet, a bottom flow inlet, and a bottom discharge outlet; an alcohol amine collecting tank; and a desorption tower comprising a bottom mixing inlet, a top gas outlet, and a liquid flow outlet on the upper side; the waste water flow outlet is connected to the inlet of the lifting pump, the outlet of the waste water flow pipeline is connected to the waste water inlet of the decarbonization membrane contactor, the waste water outlet of the decarbonization membrane contactor is connected to a post-treatment waste water outflow pipeline, the top outlet of the alcohol amine circulating tank is connected to the purge liquid inlet through a pipeline, the purge liquid outlet is connected to the bottom flow inlet of the alcohol amine circulating tank after being connected to an alcohol amine lifting pump, the bottom discharge outlet is connected to the material inlet of the alcohol amine collecting tank, the material outlet of the alcohol amine collecting tank is connected to the bottom mixing inlet of the desorption tower, the liquid flow outlet of the desorption tower is connected to the top reflux inlet of the alcohol amine circulating tank through a reflux pipeline, and the top gas outlet of the desorption tower is connected to a pure carbon dioxide tower gas pipeline.

2. The system for removing carbonate and producing purified carbon dioxide gas from wastewater according to claim 1, characterized by: An acid adding metering pump is integrated on the acid flow inlet.

3. The system for removing carbonate and producing purified carbon dioxide gas from wastewater according to claim 1, characterized by: The material inlet of the alcohol amine collecting tank is located at the top, and the bottom discharge outlet is connected to the material inlet of the alcohol amine collecting tank through an alcohol amine discharge pump.

4. The system for removing carbonate and producing purified carbon dioxide gas from wastewater according to claim 1, characterized by: The material outlet of the alcohol amine collecting tank is connected to the bottom mixing inlet of the desorption tower through a desorption tower material pump.

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