Amine waste liquid treatment system and method

Abstract

The invention discloses an amine waste liquid treatment system and method. The system of the present application comprises: an amine liquid tank; the first input end of the fractionating tower is connected to the output end of the amine liquid tank through a positive displacement pump, a first valve and a first filter, the first output end of the fractionating tower is connected to the input end of an evaporator, the second input end of the fractionating tower is connected to the output end of the evaporator, and the evaporator is used for evaporating the mixed solution to be treated; the fractionating tower is used for carrying out gas-liquid separation treatment on the gas-liquid mixture to obtain concentrated amine waste liquid and water vapor; the first input end of the waste liquid storage box is connected to the second output end of the fractionating tower; the output end of the waste liquid storage box is connected to the first input end of the burner nozzle through a second valve, a booster pump, a first flow meter and a second filter, and the second input end of the burner nozzle is connected to the high-pressure carbon dioxide gas input port through a second flow meter and a third valve.

Description

Amine waste liquid treatment system and method Technical Field

[0001] This application relates to the field of carbon dioxide capture solvent treatment technology, and in particular to an amine waste liquid treatment system and method. Background Technology

[0002] CCUS (Carbon Capture, Utilization and Storage) technology is one of the key technologies for addressing global climate change and has received high attention from countries around the world, who are increasing their research and development efforts.

[0003] Chemical absorption is the most mature carbon capture technology in CCUS, and amine solvents are widely used due to their high absorption efficiency. However, amine solvents generate amine waste liquid during recycling due to factors such as thermal degradation, oxidation, and impurity interference. With the widespread application of chemical absorption, the annual production of amine waste liquid may reach tens of thousands of tons. If not properly disposed of, it will pose a significant threat to the ecological environment and human health.

[0004] Currently, a combined process integrating physicochemical and biological methods is commonly used to treat amine wastewater. However, this combined process is highly complex, requiring significant human and material resources to effectively treat the wastewater. Therefore, existing amine wastewater treatment methods suffer from low efficiency and high costs. Summary of the Invention

[0006] This application provides an amine waste liquid treatment system and method, the main purpose of which is to improve the efficiency of amine waste liquid treatment and reduce the cost of amine waste liquid treatment.

[0007] To solve the above-mentioned technical problems, the embodiments of this application provide the following technical solutions: Firstly, this application provides an amine waste liquid treatment system, the system comprising: an amine liquid tank for storing a mixed solution to be treated, the mixed solution containing organic amine liquid and water; a fractionating tower, the first input end of the fractionating tower being connected to the output end of the amine liquid tank via a volumetric pump, a first valve, and a first filter; the first output end of the fractionating tower being connected to the input end of an evaporator; and the second input end of the fractionating tower being connected to the output end of an evaporator. The evaporator is used to evaporate the mixed solution to be treated to obtain a gas-liquid mixture corresponding to the solution to be treated, and the fractionating tower is used to perform gas-liquid separation treatment on the gas-liquid mixture. The system comprises: a waste liquid storage tank, the first input of which is connected to the second output of the fractionation tower, for storing the concentrated amine waste liquid; and a burner nozzle, the output of which is connected to the first input of the burner nozzle via a second valve, a pressurizing pump, a first flow meter, and a second filter, and the second input of which is connected to a high-pressure carbon dioxide gas inlet via a second flow meter and a third valve, for injecting high-pressure carbon dioxide gas, and the burner nozzle for atomizing the concentrated amine waste liquid with the high-pressure carbon dioxide gas and then burning the atomized concentrated amine waste liquid.

[0008] Secondly, this application also provides a method for treating amine waste liquid, which is applied to the above-mentioned amine waste liquid treatment system. The method includes: evaporating a mixed solution to be treated using an evaporator to obtain a gas-liquid mixture corresponding to the solution to be treated; separating the gas-liquid mixture using a fractionation tower to obtain concentrated amine waste liquid and water vapor; determining a target supply pressure ratio range based on the volume ratio of the concentrated amine waste liquid to the water vapor; adjusting the supply pressure corresponding to the concentrated amine waste liquid and the supply pressure corresponding to the high-pressure carbon dioxide gas based on a preset supply pressure range for the concentrated amine waste liquid, a preset supply pressure range for carbon dioxide gas, and the target supply pressure ratio range; atomizing the concentrated amine waste liquid using the high-pressure carbon dioxide gas through a burner nozzle, and then burning the atomized concentrated amine waste liquid.

[0009] By means of the above technical solution, the technical solution provided by this application has at least the following advantages: This application provides an amine waste liquid treatment system and method. The amine waste liquid treatment system provided by this application includes: an amine liquid tank for storing a mixed solution to be treated; a fractionation tower, the first input end of which is connected to the output end of the amine liquid tank through a volumetric pump, a first valve and a first filter, the first output end of which is connected to the input end of an evaporator, and the second input end of which is connected to the output end of an evaporator; a waste liquid storage tank, the first input end of which is connected to the second output end of the fractionation tower; and a burner nozzle, the output end of which is connected to the first input end of the burner nozzle through a second valve, a pressurizing pump, a first flow meter and a second filter, and the second input end of the burner nozzle is connected to a high-pressure carbon dioxide gas inlet through a second flow meter and a third valve. When amine waste liquid needs to be treated, the mixed solution to be treated is first evaporated using an evaporator to obtain a gas-liquid mixture corresponding to the solution to be treated. Then, the gas-liquid mixture is separated using a fractionation tower to obtain concentrated amine waste liquid and water vapor. Finally, after adjusting the supply pressure corresponding to the concentrated amine waste liquid and the supply pressure corresponding to the high-pressure carbon dioxide gas, the pressurized concentrated amine waste liquid is atomized using high-pressure carbon dioxide gas through a burner nozzle, and the atomized concentrated amine waste liquid is then combusted. Compared with the combined process of physicochemical and biological methods for treating amine waste liquid, the amine waste liquid treatment system disclosed in this application has a simpler treatment process. Furthermore, since the combustion products of the concentrated amine waste liquid after complete combustion should be nitrogen and water, the combustion products can be directly discharged without causing environmental pollution, thereby effectively reducing the storage and transportation costs of amine waste liquid.

[0010] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0011] The above and other objects, features, and advantages of the exemplary embodiments of this application will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this application are illustrated by way of example and not limitation, with the same or corresponding reference numerals denoteing the same or corresponding parts, wherein: Figure 1 shows a schematic structural diagram of a first amine waste liquid treatment system provided in an embodiment of this application; Figure 2 shows a schematic structural diagram of a second amine waste liquid treatment system provided in an embodiment of this application; Figure 3 shows a schematic structural diagram of a third amine waste liquid treatment system provided in an embodiment of this application; and Figure 4 shows a flowchart of an amine waste liquid treatment method provided in an embodiment of this application. Detailed Implementation

[0012] Exemplary embodiments of this application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of this application and to fully convey the scope of this application to those skilled in the art.

[0013] Furthermore, the terms “first,” “second,” and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different parts.

[0014] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application pertains.

[0015] Currently, a combined process integrating physicochemical and biological methods is commonly used to treat amine wastewater. However, this combined process is highly complex, requiring significant human and material resources to effectively treat the wastewater. Therefore, existing amine wastewater treatment methods suffer from low efficiency and high costs.

[0016] To improve the efficiency and reduce the cost of treating amine waste liquid, this application provides an amine waste liquid treatment system, as shown in Figure 1. The system includes: an amine liquid tank 1 for storing a mixed solution to be treated, the mixed solution containing organic amine liquid and water, i.e., the mixed solution to be treated is the amine waste liquid; and a fractionating tower 2, the first input end of which is connected to the output end of the amine liquid tank 1 via a volumetric pump 3, a first valve 4, and a first filter 5; the first output end of the fractionating tower 2 is connected to the input end of an evaporator 6; and the second input end of the fractionating tower 2 is connected to the output end of the evaporator 6. The evaporator 6 is used to evaporate the mixed solution to obtain a gas-liquid mixture corresponding to the solution to be treated. The fractionating tower 2 is used to further process the gas-liquid mixture. Gas-liquid separation process to obtain concentrated amine waste liquid and water vapor; waste liquid storage tank 7, the first input end of waste liquid storage tank 7 is connected to the second output end of fractionation tower 2, waste liquid storage tank 7 is used to store concentrated amine waste liquid; burner nozzle 8, the output end of waste liquid storage tank 7 is connected to the first input end of burner nozzle 8 through second valve 9, pressurization pump 10, first flow meter 11 and second filter 12, the second input end of burner nozzle 8 is connected to high pressure carbon dioxide gas inlet 15 through second flow meter 13 and third valve 14, high pressure carbon dioxide gas inlet 15 is used to inject high pressure carbon dioxide gas, burner nozzle 8 is used to atomize concentrated amine waste liquid with high pressure carbon dioxide gas and burn the atomized concentrated amine waste liquid.

[0017] The volumetric pump 3 converts mechanical energy into liquid pressure energy by periodically changing the pump chamber volume, thereby pressurizing and transporting the mixed solution to be treated stored in the amine tank 1 to the fractionation tower 2; the first filter 5 is used to filter solid impurities in the mixed solution to be treated; the inner wall of the waste liquid storage tank 7 has been pre-treated with anti-corrosion measures, so that the waste liquid storage tank 7 can store concentrated amine waste liquid for a long time; the pressurization pump 10 is used to pressurize the concentrated amine waste liquid; the first flow meter 11 is used to collect the flow rate value of the concentrated amine waste liquid; the second filter 12 is used to filter solid impurities in the concentrated amine waste liquid; and the second flow meter 13 is used to collect the flow rate value of high-pressure carbon dioxide gas.

[0018] The working process and principle of the amine waste liquid treatment system in this application are described in detail below: First, the first valve 4 is opened, and the mixed solution to be treated is pressurized and transported to the fractionation tower 2 by the volumetric pump 3. During this process, the mixed solution to be treated is filtered by the first filter 5.

[0019] Next, the fractionation tower 2 conveys the mixed solution to be treated to the evaporator 6, and uses external steam to heat the evaporator 6. The heated evaporator 6 evaporates the mixed solution to be treated, thereby obtaining the gas-liquid mixture corresponding to the solution to be treated. The evaporator 6 conveys the gas-liquid mixture to the fractionation tower 2, and the fractionation tower 2 performs gas-liquid separation treatment on the gas-liquid mixture, thereby obtaining concentrated amine waste liquid and water vapor. The concentrated amine waste liquid flows from the bottom of the fractionation tower 2 into the waste liquid storage tank 7.

[0020] Specifically, in this step, the evaporator 6 can be controlled to raise the temperature of the mixed solution to be treated to a temperature range of 110°C to 130°C for evaporation.

[0021] Next, the second valve 9 is opened, and the concentrated amine waste liquid is pressurized and delivered to the burner nozzle 8 by the pressurization pump 10. During this process, the concentrated amine waste liquid is filtered by the second filter 12. High-pressure carbon dioxide gas is injected into the high-pressure carbon dioxide gas inlet 15, and the third valve 14 is opened to deliver the high-pressure carbon dioxide gas to the burner nozzle 8. The burner nozzle 8 uses high-pressure carbon dioxide gas to atomize the concentrated amine waste liquid and then burns the atomized concentrated amine waste liquid. The outlet of the burner nozzle 8 is a high-load furnace combustion chamber, that is, the burner nozzle 8 burns the atomized concentrated amine waste liquid in the furnace combustion chamber.

[0022] It should be noted that since concentrated amine waste liquid is essentially an organic amine liquid, when the concentrated amine waste liquid is fully burned, the combustion products should be nitrogen and water. Therefore, the combustion products can be directly discharged without causing environmental pollution.

[0023] Specifically, in this step, in order to ensure that the concentrated amine waste liquid can be fully combusted, it is necessary to control the supply pressure of the concentrated amine waste liquid and the supply pressure of the high-pressure carbon dioxide gas.

[0024] The specific process for controlling the supply pressure of concentrated amine waste liquid is as follows: the flow rate value of the concentrated amine waste liquid is collected based on the first flow meter 11, and the supply pressure of the concentrated amine waste liquid is determined based on the flow rate value of the concentrated amine waste liquid, and it is determined whether the supply pressure of the concentrated amine waste liquid is within the preset supply pressure range of concentrated amine waste liquid; if the supply pressure of the concentrated amine waste liquid is not within the preset supply pressure range of concentrated amine waste liquid, the opening of the second valve 9 is adjusted according to the supply pressure of the concentrated amine waste liquid so that the adjusted supply pressure of the concentrated amine waste liquid is within the preset supply pressure range of concentrated amine waste liquid, wherein the preset supply pressure range of concentrated amine waste liquid may be, but is not limited to, 0.5 MPa ~ 0.8 MPa.

[0025] The specific process for controlling the supply pressure of high-pressure carbon dioxide gas is as follows: After adjusting the supply pressure corresponding to the concentrated amine waste liquid, the flow rate value corresponding to the high-pressure carbon dioxide gas is collected based on the second flow meter 13, and the supply pressure corresponding to the high-pressure carbon dioxide gas is determined based on the flow rate value. After calculating the ratio of the supply pressure corresponding to the high-pressure carbon dioxide gas to the supply pressure corresponding to the concentrated amine waste liquid, it is determined whether the supply pressure corresponding to the high-pressure carbon dioxide gas is within the preset carbon dioxide gas supply pressure range, and whether the ratio of the supply pressure corresponding to the high-pressure carbon dioxide gas to the supply pressure corresponding to the concentrated amine waste liquid is within the preset supply pressure ratio range. If the high-pressure carbon dioxide gas... If the supply pressure corresponding to the body is not within the preset carbon dioxide gas supply pressure range, and / or the ratio of the supply pressure corresponding to the high-pressure carbon dioxide gas to the supply pressure corresponding to the concentrated amine waste liquid is not within the preset supply pressure ratio range, then the opening of the third valve 14 is adjusted according to the supply pressure corresponding to the high-pressure carbon dioxide gas and the supply pressure corresponding to the concentrated amine waste liquid, so that the adjusted supply pressure corresponding to the high-pressure carbon dioxide gas is within the preset carbon dioxide gas supply pressure range, and the ratio of the adjusted supply pressure corresponding to the high-pressure carbon dioxide gas to the supply pressure corresponding to the concentrated amine waste liquid is within the preset supply pressure ratio range. The preset carbon dioxide gas supply pressure range may be, but is not limited to, 0.6 MPa ~ 1.0 MPa, and the preset supply pressure ratio range may be, but is not limited to, 1.1 ~ 1.5.

[0026] This application provides an amine waste liquid treatment system, comprising: an amine liquid tank for storing a mixed solution to be treated; a fractionation tower, the first input end of which is connected to the output end of the amine liquid tank via a volumetric pump, a first valve, and a first filter, the first output end of which is connected to the input end of an evaporator, and the second input end of which is connected to the output end of the evaporator; a waste liquid storage tank, the first input end of which is connected to the second output end of the fractionation tower; and a burner nozzle, the output end of which is connected to the first input end of the burner nozzle via a second valve, a pressurizing pump, a first flow meter, and a second filter, and the second input end of the burner nozzle is connected to a high-pressure carbon dioxide gas inlet via a second flow meter and a third valve. When amine waste liquid needs to be treated, the mixed solution to be treated is first evaporated using an evaporator to obtain a gas-liquid mixture corresponding to the solution to be treated. Then, the gas-liquid mixture is separated using a fractionation tower to obtain concentrated amine waste liquid and water vapor. Finally, after adjusting the supply pressure corresponding to the concentrated amine waste liquid and the supply pressure corresponding to the high-pressure carbon dioxide gas, the pressurized concentrated amine waste liquid is atomized using high-pressure carbon dioxide gas through a burner nozzle, and the atomized concentrated amine waste liquid is then combusted. Compared with a combined process of physicochemical and biological methods to treat amine waste liquid, the amine waste liquid treatment system disclosed in this application has simpler steps for treating amine waste liquid. Furthermore, since the combustion products of the concentrated amine waste liquid after complete combustion should be nitrogen and water, the combustion products can be directly discharged without causing environmental pollution, thereby effectively reducing the storage and transportation costs of amine waste liquid.

[0027] Furthermore, as shown in Figure 2, a first level gauge 16 is installed on the side wall of the waste liquid storage tank 7. The first level gauge 16 is used to collect the liquid level value of the concentrated amine waste liquid in the waste liquid storage tank 7. A stirrer 17 and a viscometer 18 are installed at the bottom of the waste liquid storage tank 7. The viscometer 18 is used to collect the fluid viscosity of the concentrated amine waste liquid in the waste liquid storage tank 7, and the stirrer 17 is used to stir the concentrated amine waste liquid in the waste liquid storage tank 7. In this embodiment, the higher the viscosity of the concentrated amine waste liquid, the worse its fluidity. To ensure that the concentrated amine waste liquid can be stably delivered to the burner nozzle 8, it is necessary to ensure that the concentrated amine waste liquid stored in the waste liquid storage tank 7 has a certain fluidity. Therefore, it is necessary to control the viscosity of the concentrated amine waste liquid stored in the waste liquid storage tank 7. The specific process is as follows: the viscosity of the concentrated amine waste liquid in the waste liquid storage tank 7 is collected based on the viscometer 18, and it is determined whether the viscosity of the concentrated amine waste liquid is greater than the preset fluid viscosity threshold. If so, the liquid level value of the concentrated amine waste liquid in the waste liquid storage tank 7 is collected based on the second liquid level gauge 23, and the water injection volume is determined according to the fluid viscosity and liquid level value of the concentrated amine waste liquid. Distilled water is injected into the waste liquid storage tank 7 according to the determined water injection volume, and the concentrated amine waste liquid is stirred based on the stirrer 17, thereby reducing the fluid viscosity of the concentrated amine waste liquid in the waste liquid storage tank 7 to below the preset fluid viscosity threshold.

[0028] In addition, to prevent the concentrated amine waste liquid in the waste liquid storage tank 7 from solidifying and sticking together, the stirrer 17 can be controlled to stir the concentrated amine waste liquid according to a preset cycle and preset duration. The preset cycle can be, but is not limited to, 10 minutes, 20 minutes, 30 minutes, etc., and the preset duration can be, but is not limited to, 2 minutes, 5 minutes, 10 minutes, etc. For example, when the preset cycle is 10 minutes and the preset duration is 2 minutes, the stirrer 17 can be controlled to stir the concentrated amine waste liquid every 10 minutes, and the duration of each stirring is 2 minutes, but it is not limited to this.

[0029] Furthermore, as shown in Figure 3, the amine waste liquid treatment system also includes: a condenser 19, the input end of which is connected to the third output end of the fractionation tower 2, and the condenser 19 is used to condense water vapor to obtain distilled water; a water tank 20, the input end of which is connected to the output end of the condenser 19, the first output end of which is connected to the second input end of the waste liquid storage tank 7 through a fourth valve 21, the second output end of which is connected to the water tank through a fifth valve 22, a second level gauge 23 is provided on the side wall of the water tank 20, the water tank 20 is used to store distilled water, and the second level gauge 23 is used to collect the level value of the distilled water in the water tank 20; and a vacuum pump 24, which is located on the top of the water tank 20, and is used to provide negative pressure conditions for the evaporator 6. In this embodiment, the gas-liquid mixture corresponding to the solution to be treated is separated in the fractionation tower 2 to obtain concentrated amine waste liquid and water vapor. The water vapor is discharged from the top of the fractionation tower 2 and enters the condenser 19. The condenser 19 condenses the water vapor to obtain distilled water, which is then discharged into the water tank 20 for storage. When it is necessary to inject distilled water into the waste liquid storage tank 7, the fourth valve 21 can be opened to inject the distilled water stored in the water tank 20 into the waste liquid storage tank 7.

[0030] In addition, the vacuum pump 24 installed at the top of the water tank 20 can provide negative pressure conditions for the evaporator 6, thereby ensuring that the evaporator 6 can evaporate the mixed solution to be treated under negative pressure environment.

[0031] In addition, the level of distilled water in the water tank 20 can be collected by the second level gauge 23 installed on the side wall of the water tank 20. When the level of distilled water in the water tank 20 is greater than the preset level threshold, the fifth valve 22 is opened. Based on the difference between the level of distilled water in the water tank 20 and the preset level threshold, part of the distilled water in the water tank 20 is discharged into the water tank, thereby ensuring that the distilled water stored in the water tank 20 is within a safe range and preventing safety accidents.

[0032] Furthermore, a preheater is installed at the top of the fractionation tower 2 to preheat the mixed solution to be treated. In this embodiment, after the mixed solution to be treated is pressurized and transported into the fractionation tower 2 by the volumetric pump 3, the mixed solution to be treated can be preheated by the preheater installed at the top of the fractionation tower 2 to raise the temperature of the mixed solution to be treated from room temperature to the target temperature range (e.g., 40℃-45℃). Preheating the mixed solution to be treated can reduce heat loss caused by water vapor discharge and improve the separation efficiency of gas-liquid separation of the mixed solution to be treated.

[0033] This application embodiment also provides an amine waste liquid treatment method, which is applied to the amine waste liquid treatment system shown in Figure 1, Figure 2 or Figure 3. Specifically, as shown in Figure 4, the method includes: 201, evaporating the mixed solution to be treated based on an evaporator to obtain a gas-liquid mixture corresponding to the solution to be treated.

[0034] In this embodiment, after the first valve is opened, the mixed solution to be treated is pressurized and transported to the fractionation tower by a volumetric pump, and then the mixed solution to be treated is transported to the evaporator by the fractionation tower. The mixed solution to be treated is evaporated by the evaporator, that is, the evaporator is heated by external steam, and the heated evaporator evaporates the mixed solution to be treated, thereby obtaining the gas-liquid mixture corresponding to the solution to be treated.

[0035] 202. Based on the fractionation tower, the gas-liquid mixture is subjected to gas-liquid separation treatment to obtain concentrated amine waste liquid and water vapor.

[0036] After obtaining the gas-liquid mixture corresponding to the solution to be treated by the evaporator, the gas-liquid mixture corresponding to the solution to be treated can be transported to the fractionation tower by the evaporator. The fractionation tower performs gas-liquid separation treatment on the gas-liquid mixture corresponding to the solution to be treated, thereby obtaining concentrated amine waste liquid and water vapor. The concentrated amine waste liquid flows from the bottom of the fractionation tower into the waste liquid storage tank for storage, while the water vapor is discharged from the top of the fractionation tower and enters the condenser. The condenser condenses the water vapor to obtain distilled water, which is then discharged into the water tank for storage.

[0037] 203. Determine the target supply pressure ratio range based on the volume ratio of concentrated amine waste liquid to water vapor.

[0038] Because the nitrogen content in the concentrated amine waste liquid varies, high-pressure carbon dioxide gas with different supply pressures is required to atomize the waste liquid to ensure complete combustion. Furthermore, the volume ratio of concentrated amine waste liquid to water vapor obtained from gas-liquid separation of the gas-liquid mixture corresponding to the solution to be treated varies depending on the nitrogen content. Therefore, the nitrogen content in the concentrated amine waste liquid can be determined based on the volume ratio of concentrated amine waste liquid to water vapor obtained from gas-liquid separation. This allows for the determination of the optimal range (i.e., the optimal supply pressure ratio range) for the ratio of high-pressure carbon dioxide gas supply pressure to concentrated amine waste liquid supply pressure when atomizing the concentrated amine waste liquid using high-pressure carbon dioxide gas.

[0039] Specifically, in this step, the optimal supply pressure ratio range corresponding to different volume ratios of concentrated amine waste liquid and water vapor can be preset.

[0040] During the process of storing concentrated amine waste liquid into the waste liquid storage tank, the liquid level change value of the concentrated amine waste liquid in the waste liquid storage tank is collected based on the second liquid level gauge, and the volume of concentrated amine waste liquid obtained in this gas-liquid separation process is determined based on the liquid level change value of the concentrated amine waste liquid. During the process of storing the condensed distilled water into the water tank, the liquid level change value of the distilled water in the water tank is collected based on the first liquid level gauge, and the volume of distilled water obtained in this gas-liquid separation process is determined based on the liquid level change value of the distilled water, and the volume of water vapor obtained in this gas-liquid separation process is determined based on the volume of distilled water. After determining the volume ratio of concentrated amine waste liquid to water vapor obtained in this gas-liquid separation process, the optimal supply pressure ratio range (i.e., the target supply pressure ratio range) between the high-pressure carbon dioxide gas supply pressure and the concentrated amine waste liquid supply pressure can be determined based on the volume ratio of concentrated amine waste liquid to water vapor.

[0041] 204. Adjust the supply pressure corresponding to the concentrated amine waste liquid and the supply pressure corresponding to the high-pressure carbon dioxide gas according to the preset supply pressure range of concentrated amine waste liquid, the preset supply pressure range of carbon dioxide gas and the target supply pressure ratio range.

[0042] When the concentrated amine waste liquid stored in the waste liquid storage tank needs to be treated, the second and third valves need to be opened. To ensure complete combustion of the concentrated amine waste liquid, the supply pressure of the concentrated amine waste liquid and the supply pressure of the high-pressure carbon dioxide gas need to be controlled. Specifically, the supply pressure of the concentrated amine waste liquid and the supply pressure of the high-pressure carbon dioxide gas are adjusted according to the preset supply pressure range of the concentrated amine waste liquid, the preset supply pressure range of the carbon dioxide gas, and the target supply pressure ratio range.

[0043] 205. The concentrated amine waste liquid is atomized using the high-pressure carbon dioxide gas through the burner nozzle, and the atomized concentrated amine waste liquid is then combusted.

[0044] After opening the second and third valves, the concentrated amine waste liquid and high-pressure carbon dioxide gas are delivered to the burner nozzle. At this time, the concentrated amine waste liquid can be atomized by the high-pressure carbon dioxide gas through the burner nozzle, and then the atomized concentrated amine waste liquid is burned. The outlet of the burner nozzle is a high-load furnace combustion chamber, that is, the burner nozzle burns the atomized concentrated amine waste liquid in the furnace combustion chamber.

[0045] It should be noted that since concentrated amine waste liquid is essentially an organic amine liquid, when the concentrated amine waste liquid is fully burned, the combustion products should be nitrogen and water. Therefore, the combustion products can be directly discharged without causing environmental pollution.

[0046] Furthermore, in this embodiment of the application, in order to ensure that the concentrated amine waste liquid can be fully combusted, it is necessary to control the supply pressure of the concentrated amine waste liquid and the supply pressure of the high-pressure carbon dioxide gas. That is, firstly, the concentrated amine waste liquid is pressurized by a pressurizing pump; then, the supply pressure of the concentrated amine waste liquid is adjusted according to the preset supply pressure range of the concentrated amine waste liquid; finally, the supply pressure of the high-pressure carbon dioxide gas is adjusted according to the preset supply pressure range of the carbon dioxide gas, the adjusted supply pressure of the concentrated amine waste liquid, and the target supply pressure ratio range.

[0047] The specific process of adjusting the supply pressure of concentrated amine waste liquid according to the preset supply pressure range of concentrated amine waste liquid is as follows: the flow rate value of the concentrated amine waste liquid is collected based on the first flow meter, and the supply pressure of the concentrated amine waste liquid is determined based on the flow rate value of the concentrated amine waste liquid, and it is determined whether the supply pressure of the concentrated amine waste liquid is within the preset supply pressure range of concentrated amine waste liquid; if the supply pressure of the concentrated amine waste liquid is not within the preset supply pressure range of concentrated amine waste liquid, the opening of the second valve is adjusted according to the supply pressure of the concentrated amine waste liquid so that the adjusted supply pressure of the concentrated amine waste liquid is within the preset supply pressure range of concentrated amine waste liquid, wherein the preset supply pressure range of concentrated amine waste liquid may be, but is not limited to, 0.5 MPa ~ 0.8 MPa.

[0048] The specific process for adjusting the supply pressure of high-pressure carbon dioxide gas, based on the preset carbon dioxide gas supply pressure range, the ratio range between the adjusted supply pressure of concentrated amine waste liquid and the target supply pressure, is as follows: After adjusting the supply pressure of concentrated amine waste liquid, the flow rate of high-pressure carbon dioxide gas is collected based on the second flow meter, and the supply pressure of high-pressure carbon dioxide gas is determined based on the flow rate. Furthermore, after calculating the ratio of the supply pressure of high-pressure carbon dioxide gas to the adjusted supply pressure of concentrated amine waste liquid, it is determined whether the supply pressure of high-pressure carbon dioxide gas is within the preset carbon dioxide gas supply pressure range, and whether the ratio of the supply pressure of high-pressure carbon dioxide gas to the supply pressure of concentrated amine waste liquid is within the preset range. Within the target supply pressure ratio range; if the supply pressure corresponding to the high-pressure carbon dioxide gas is not within the preset carbon dioxide gas supply pressure range, and / or the ratio of the supply pressure corresponding to the high-pressure carbon dioxide gas to the supply pressure corresponding to the concentrated amine waste liquid is not within the target supply pressure ratio range, then the opening of the third valve is adjusted according to the supply pressure corresponding to the high-pressure carbon dioxide gas and the adjusted supply pressure corresponding to the concentrated amine waste liquid, so that the adjusted supply pressure corresponding to the high-pressure carbon dioxide gas is within the preset carbon dioxide gas supply pressure range, and the ratio of the adjusted supply pressure corresponding to the high-pressure carbon dioxide gas to the adjusted supply pressure corresponding to the concentrated amine waste liquid is within the target supply pressure ratio range, wherein the preset carbon dioxide gas supply pressure range may be, but is not limited to, 0.6 MPa ~ 1.0 MPa.

[0049] Furthermore, since the higher the viscosity of the concentrated amine waste liquid, the worse its flowability, it is necessary to ensure that the concentrated amine waste liquid stored in the waste liquid storage tank has a certain degree of flowability in order to ensure that it can be stably delivered to the burner nozzle. This requires controlling the viscosity of the concentrated amine waste liquid stored in the waste liquid storage tank. The specific process is as follows: the viscosity of the concentrated amine waste liquid in the waste liquid storage tank is collected using a viscometer, and it is determined whether the viscosity is greater than a preset viscosity threshold. If so, the viscosity is adjusted based on the second liquid level. The liquid level of the concentrated amine waste liquid in the waste liquid storage tank is collected. Based on the fluid viscosity and liquid level of the concentrated amine waste liquid, the water injection volume is determined (i.e., the volume of the concentrated amine waste liquid is first calculated based on the liquid level and the size of the waste liquid storage tank, and then the water injection volume is determined based on the volume and fluid viscosity of the concentrated amine waste liquid). Distilled water is injected into the waste liquid storage tank according to the determined water injection volume, and the concentrated amine waste liquid is stirred by a stirrer to reduce the fluid viscosity of the concentrated amine waste liquid in the waste liquid storage tank to below the preset fluid viscosity threshold.

[0050] Furthermore, to prevent excessive distilled water storage in the water tank from causing safety accidents, a second level gauge installed on the side wall of the water tank can be used to collect the level value of the distilled water in the tank. When the level value of the distilled water in the tank is greater than the preset level threshold, the fifth valve is opened, and based on the difference between the level value of the distilled water in the tank and the preset level threshold, part of the distilled water in the tank is discharged into the water tank, thereby ensuring that the distilled water stored in the tank is within a safe range and preventing safety accidents.

[0051] Furthermore, after the mixed solution to be treated is pressurized and transported to the fractionation tower by a volumetric pump, the mixed solution to be treated can be preheated by a preheater installed at the top of the fractionation tower, raising the temperature of the mixed solution to be treated from room temperature to the target temperature range (such as 40℃-45℃). Preheating the mixed solution to be treated can reduce heat loss caused by water vapor discharge and improve the separation efficiency of gas-liquid separation of the mixed solution to be treated.

[0052] This application provides an amine waste liquid treatment system and method. The amine waste liquid treatment system provided in this application includes: an amine liquid tank for storing a mixed solution to be treated; a fractionation tower, the first input end of which is connected to the output end of the amine liquid tank via a volumetric pump, a first valve, and a first filter, the first output end of which is connected to the input end of an evaporator, and the second input end of which is connected to the output end of the evaporator; a waste liquid storage tank, the first input end of which is connected to the second output end of the fractionation tower; and a burner nozzle, the output end of which is connected to the first input end of the burner nozzle via a second valve, a pressurizing pump, a first flow meter, and a second filter, and the second input end of the burner nozzle is connected to a high-pressure carbon dioxide gas inlet via a second flow meter and a third valve. When amine waste liquid needs to be treated, the mixed solution to be treated is first evaporated using an evaporator to obtain a gas-liquid mixture corresponding to the solution to be treated. Then, the gas-liquid mixture is separated using a fractionation tower to obtain concentrated amine waste liquid and water vapor. Finally, after adjusting the supply pressure corresponding to the concentrated amine waste liquid and the supply pressure corresponding to the high-pressure carbon dioxide gas, the pressurized concentrated amine waste liquid is atomized using high-pressure carbon dioxide gas through a burner nozzle, and the atomized concentrated amine waste liquid is then combusted. Compared with a combined process of physicochemical and biological methods to treat amine waste liquid, the amine waste liquid treatment system disclosed in this application has simpler steps for treating amine waste liquid. Furthermore, since the combustion products of the concentrated amine waste liquid after complete combustion should be nitrogen and water, the combustion products can be directly discharged without causing environmental pollution, thereby effectively reducing the storage and transportation costs of amine waste liquid.

[0053] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0054] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in one or more blocks of the flowchart illustrations and / or one or more blocks of the block diagrams.

[0055] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means that implement the functions specified in one or more flowcharts and / or one or more block diagrams.

[0056] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide steps for implementing the functions specified in one or more flowcharts and / or one or more block diagrams.

[0057] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0058] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0059] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0060] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0061] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0062] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. An amine waste liquid treatment system, characterized in that, The system includes: an amine liquid tank for storing a mixed solution to be treated, the mixed solution containing organic amine liquid and water; a fractionating column, the first input end of which is connected to the output end of the amine liquid tank via a volumetric pump, a first valve, and a first filter; the first output end of the fractionating column is connected to the input end of an evaporator; the second input end of the fractionating column is connected to the output end of the evaporator; the evaporator is used to evaporate the mixed solution to obtain a gas-liquid mixture corresponding to the solution; the fractionating column is used to perform gas-liquid separation treatment on the gas-liquid mixture to obtain concentrated amine waste liquid and water vapor; and a waste liquid storage tank. The first input end of the waste liquid storage tank is connected to the second output end of the fractionation tower. The waste liquid storage tank is used to store the concentrated amine waste liquid. The output end of the waste liquid storage tank is connected to the first input end of the burner nozzle through a second valve, a pressurizing pump, a first flow meter, and a second filter. The second input end of the burner nozzle is connected to a high-pressure carbon dioxide gas inlet through a second flow meter and a third valve. The high-pressure carbon dioxide gas inlet is used to inject high-pressure carbon dioxide gas. The burner nozzle is used to atomize the concentrated amine waste liquid with the high-pressure carbon dioxide gas and then burn the atomized concentrated amine waste liquid.

2. The system according to claim 1, characterized in that, A first level gauge is installed on the side wall of the waste liquid storage tank, which is used to collect the liquid level value of the concentrated amine waste liquid in the waste liquid storage tank; a stirrer and a viscometer are installed at the bottom of the waste liquid storage tank, the viscometer is used to collect the fluid viscosity of the concentrated amine waste liquid in the waste liquid storage tank, and the stirrer is used to stir the concentrated amine waste liquid in the waste liquid storage tank.

3. The system according to claim 2, characterized in that, The system further includes: a condenser, the input end of which is connected to the third output end of the fractionation tower, the condenser being used to condense the water vapor to obtain distilled water; a water tank, the input end of which is connected to the output end of the condenser, the first output end of which is connected to the second input end of the waste liquid storage tank via a fourth valve, the second output end of which is connected to a water tank via a fifth valve, a second level gauge being installed on the side wall of the water tank, the water tank being used to store the distilled water, and the second level gauge being used to collect the level value of the distilled water in the water tank; and a vacuum pump, the vacuum pump being installed at the top of the water tank, the vacuum pump being used to provide negative pressure conditions for the evaporator.

4. The system according to claim 1, characterized in that, A preheater is provided at the top of the fractionation tower, which is used to preheat the mixed solution to be treated.

5. A method for treating amine waste liquid, characterized in that, The method is applied to the amine waste liquid treatment system as described in any one of claims 1-4. The method includes: evaporating a mixed solution to be treated using an evaporator to obtain a gas-liquid mixture corresponding to the solution to be treated; performing gas-liquid separation treatment on the gas-liquid mixture using a fractionation tower to obtain concentrated amine waste liquid and water vapor; determining a target supply pressure ratio range based on the volume ratio of the concentrated amine waste liquid to the water vapor; adjusting the supply pressure corresponding to the concentrated amine waste liquid and the supply pressure corresponding to the high-pressure carbon dioxide gas based on a preset concentrated amine waste liquid supply pressure range, a preset carbon dioxide gas supply pressure range, and the target supply pressure ratio range; atomizing the concentrated amine waste liquid using the high-pressure carbon dioxide gas through a burner nozzle, and then combusting the atomized concentrated amine waste liquid.

6. The method according to claim 5, characterized in that, The step of adjusting the supply pressure corresponding to the concentrated amine waste liquid and the supply pressure corresponding to the high-pressure carbon dioxide gas according to the preset supply pressure range of the concentrated amine waste liquid, the preset supply pressure range of the carbon dioxide gas, and the target supply pressure ratio range includes: pressurizing the concentrated amine waste liquid using a pressurizing pump; adjusting the supply pressure corresponding to the concentrated amine waste liquid according to the preset supply pressure range of the concentrated amine waste liquid; and adjusting the supply pressure corresponding to the high-pressure carbon dioxide gas according to the preset supply pressure range of the carbon dioxide gas, the adjusted supply pressure corresponding to the concentrated amine waste liquid, and the target supply pressure ratio range.

7. The method according to claim 6, characterized in that, The step of adjusting the supply pressure of the concentrated amine waste liquid according to the preset supply pressure range of the concentrated amine waste liquid includes: collecting the flow rate value of the concentrated amine waste liquid based on the first flow meter; determining the supply pressure of the concentrated amine waste liquid based on the flow rate value of the concentrated amine waste liquid; determining whether the supply pressure of the concentrated amine waste liquid is within the preset supply pressure range of the concentrated amine waste liquid; if not, adjusting the opening of the second valve according to the supply pressure of the concentrated amine waste liquid so that the adjusted supply pressure of the concentrated amine waste liquid is within the preset supply pressure range of the concentrated amine waste liquid.

8. The method according to claim 6, characterized in that, The step of adjusting the supply pressure of the high-pressure carbon dioxide gas according to the preset carbon dioxide gas supply pressure range, the adjusted supply pressure of the concentrated amine waste liquid, and the target supply pressure ratio range includes: collecting the flow rate value of the high-pressure carbon dioxide gas based on a second flow meter; determining the supply pressure of the high-pressure carbon dioxide gas based on the flow rate value; calculating the ratio of the supply pressure of the high-pressure carbon dioxide gas to the adjusted supply pressure of the concentrated amine waste liquid; determining whether the supply pressure of the high-pressure carbon dioxide gas is within the preset carbon dioxide gas supply pressure range and whether the ratio is within the target supply pressure ratio range; if not, adjusting the opening of the third valve according to the supply pressure of the high-pressure carbon dioxide gas and the adjusted supply pressure of the concentrated amine waste liquid, so that the adjusted supply pressure of the high-pressure carbon dioxide gas is within the preset carbon dioxide gas supply pressure range and the ratio of the adjusted supply pressure of the high-pressure carbon dioxide gas to the adjusted supply pressure of the concentrated amine waste liquid is within the target supply pressure ratio range.

9. The method according to claim 5, characterized in that, The method further includes: collecting the fluid viscosity of the concentrated amine waste liquid in the waste liquid storage tank based on a viscometer; determining whether the fluid viscosity of the concentrated amine waste liquid is greater than a preset fluid viscosity threshold; if so, collecting the liquid level value of the concentrated amine waste liquid based on a second liquid level gauge, and determining the water injection volume based on the fluid viscosity and liquid level value of the concentrated amine waste liquid; injecting distilled water into the waste liquid storage tank according to the water injection volume; and stirring the concentrated amine waste liquid based on a stirrer.

10. The method according to claim 5, characterized in that, The method further includes: collecting the level value of distilled water in the water tank based on the first level gauge; determining whether the level value of the distilled water is greater than a preset level value threshold; if so, discharging the distilled water in the water tank into the water trough according to the difference between the level value of the distilled water and the preset level value threshold.

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