Treatment device for amine liquid purification wastewater

Abstract

The utility model relates to the field of waste liquid treatment, and discloses an amine liquid purification waste water treatment device which comprises a waste liquid storage tank, an evaporation tank, a condenser and a liquid receiving tank which are sequentially connected in series through a pipeline, and the amine liquid purification waste water stored in the waste liquid storage tank is firstly evaporated through the evaporation tank; steam obtained through evaporation is cooled through a condenser, and liquid obtained through cooling enters a liquid receiving tank. The treatment device provided by the utility model can effectively treat waste liquid generated in the amine liquid ion exchange process, and realizes amine liquid purification without waste liquid discharge and resource recycling.

Description

Technical Field

[0001] This utility model relates to the field of waste liquid treatment and discloses a treatment device for purifying amine liquid wastewater. Background Technology

[0002] The organic amine method is currently widely used to remove acidic gases from natural gas, liquefied petroleum gas, and flue gas. During this process, the organic amine and the salts it absorbs gradually degrade and oxidize. Furthermore, non-renewable substances such as inorganic salts, metal ions, and strong acids carried in the gas also enter the organic amine and accumulate, increasing the content of thermally stable salts and causing problems such as foaming, blackening, pipeline corrosion, and decreased deacidification capacity.

[0003] Therefore, amine desulfurization units are usually equipped with amine purification equipment to purify the amine solution. Ion exchange is currently the most common and effective purification method. However, in the process of removing thermally stable salts, a large amount of waste liquid is often generated. This waste liquid not only contains a large amount of organic amines, but also a certain amount of alkali, salts and metal ions, with a very high COD (greater than 100,000 mg / L), making it difficult to treat. Utility Model Content

[0004] The purpose of this invention is to overcome the problem of the difficulty in treating the large amount of waste liquid generated during the removal of thermally stable salts from amine solutions in the existing technology, and to provide a treatment device for amine solution purification wastewater. This device can effectively treat the waste liquid generated during the ion exchange process of amine solutions, and realize amine solution purification without waste liquid discharge and resource recycling.

[0005] To achieve the above objectives, this utility model provides a treatment device for amine purification wastewater. The device includes a waste liquid storage tank, an evaporator, a condenser, and a receiving tank connected in series by pipelines. The amine purification wastewater stored in the waste liquid storage tank is first evaporated in the evaporator. The vapor obtained from the evaporation is cooled by the condenser, and the cooled liquid enters the receiving tank.

[0006] Preferably, the waste liquid storage tank is provided with a waste liquid storage tank inlet at the top, and the amine purification wastewater enters the waste liquid storage tank for storage through the waste liquid storage tank inlet.

[0007] Preferably, the waste liquid storage tank is equipped with a level gauge to display the liquid level inside the waste liquid storage tank.

[0008] Preferably, the evaporator is equipped with a level gauge to display the liquid level inside the evaporator.

[0009] Preferably, the evaporator is equipped with a thermometer to display the temperature inside the evaporator.

[0010] Preferably, the evaporator is equipped with a pressure gauge to display the pressure inside the evaporator.

[0011] Preferably, the evaporator is equipped with a material mixer, which is one or more of a stirring paddle, a stirring motor, and a circulating pump.

[0012] Preferably, the lower end of the evaporator is provided with a discharge port for discharging waste residue inside the evaporator.

[0013] Preferably, the evaporator is equipped with a heating device, which is one or more of electric heating, steam heating, and heat transfer oil heating.

[0014] Preferably, a metering pump and a flow meter are installed sequentially on the pipeline between the waste liquid storage tank and the evaporator along the material flow direction.

[0015] Preferably, the material flow rate displayed by the flow meter is matched with the power of the heating device in the evaporator.

[0016] Preferably, the flow rate of the metering pump is controlled by the flow meter.

[0017] Preferably, the condenser is a tubular heat exchanger, with the cooling medium flowing inside the tubes and the steam obtained from evaporation in the evaporator flowing inside the shell. The steam is condensed into liquid water in the condenser and then enters the receiving tank.

[0018] Preferably, the receiving tank is equipped with a level gauge to display the liquid level inside the tank.

[0019] Preferably, the receiving tank is equipped with a thermometer to display the temperature of the condensed liquid inside the tank.

[0020] Preferably, the receiving tank is equipped with a pressure gauge to display the pressure inside the receiving tank.

[0021] Preferably, a drain line is provided at the lower end of the receiving tank for discharging the distillate stored in the receiving tank; along the material flow direction, valves and pumps are installed in sequence on the drain line for controlling the discharge of the distillate.

[0022] Preferably, the receiving tank is provided with a vent for depressurization during maintenance or slag removal.

[0023] Preferably, the upper end of the liquid receiving tank is connected to a vacuum pump.

[0024] Preferably, the vacuum pump is one or more of a liquid circulation pump, a Roots pump, and a claw pump.

[0025] Preferably, the vacuum pump is provided with a gas vent for venting extracted gas.

[0026] Through the above technical solution, the amine liquid purification wastewater treatment device provided by this utility model can effectively treat the waste liquid generated during the ion exchange process of amine liquid, and further obtain thermally stable salt residue and water. By separating and recovering the water, the amine liquid can be purified again to reduce the purification cost, and achieve amine liquid purification without waste liquid discharge and resource recycling. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of an amine liquid purification wastewater treatment device according to a specific embodiment of this utility model.

[0028] Explanation of reference numerals in the attached figures

[0029] 1 Waste liquid storage tank; 2 Metering pump; 3 Flow meter; 4 Evaporator; 5 Condenser; 6 Liquid receiving tank; 7 Vacuum pump. Detailed Implementation

[0030] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0031] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "left," and "right" generally refer to the upper, lower, left, and right as shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself.

[0032] In this invention, the amine purification wastewater is the waste liquid generated during the removal of thermally stable salts from amine liquid purified by ion exchange. In addition to water, the waste liquid contains a large amount of organic amines and a certain amount of alkali, salts and metal ions, and has a very high COD (greater than 100,000 mg / L).

[0033] In this invention, the non-evaporable waste residue in the purified wastewater mainly consists of organic amines, NaOH, metal ion salts, etc.

[0034] In this invention, the liquid stored in the receiving tank 6 after cooling is mainly water, with very low levels of COD and ammonia nitrogen.

[0035] See also Figure 1 The schematic diagram shown is of an amine purification wastewater treatment device. This utility model provides an amine purification wastewater treatment device, which includes: a waste liquid storage tank 1, an evaporator 4, a condenser 5, and a receiving tank 6 connected in series by pipelines. The amine purification wastewater stored in the waste liquid storage tank 1 is first evaporated through the evaporator 4. The vapor obtained by evaporation is cooled through the condenser 5, and the cooled liquid enters the receiving tank 6.

[0036] The method for treating amine purification wastewater using the device of this utility model includes: the amine purification wastewater stored in the wastewater storage tank 1 is first evaporated through the evaporator 4, the vapor obtained by evaporation is passed into the condenser 5 for cooling, and the liquid obtained after cooling is passed into the receiving tank 6 for storage, and the non-evaporable waste residue in the amine purification wastewater is discharged through the discharge port provided at the lower end of the evaporator 4.

[0037] According to a specific embodiment of the present invention, the top of the waste liquid storage tank 1 is provided with a waste liquid storage tank inlet, and the amine purification wastewater enters the waste liquid storage tank 1 for storage through the waste liquid storage tank inlet.

[0038] According to a specific embodiment of this utility model, the waste liquid storage tank 1 is equipped with a level gauge to display the liquid level inside the waste liquid storage tank 1. The amount of amine purification wastewater supplied from upstream is adjusted according to the liquid level in the waste liquid storage tank 1 to ensure sufficient wastewater for subsequent further treatment.

[0039] According to a specific embodiment of this utility model, the evaporator 4 is equipped with a level gauge to display the liquid level inside the evaporator 4, preventing instability in the liquid level caused by a mismatch between wastewater evaporation and supply. When non-evaporable residue accumulates to a certain level inside the evaporator 4, it can be discharged from the evaporator 4.

[0040] According to a specific embodiment of the present invention, the evaporator 4 is equipped with a thermometer for displaying the temperature inside the evaporator 4.

[0041] According to a specific embodiment of the present invention, the evaporator 4 is equipped with a pressure gauge to display the pressure inside the evaporator 4.

[0042] This invention uses a thermometer and a pressure gauge to adjust the temperature and pressure inside the evaporator 4 according to actual needs, ensuring that the material inside the evaporator 4 undergoes controllable evaporation.

[0043] According to a specific embodiment of this utility model, the evaporator 4 is equipped with a material mixer, which is one or more of a stirring paddle, a stirring motor, and a circulating pump. This utility model ensures that the material is heated evenly during evaporation by incorporating a material mixer.

[0044] According to a specific embodiment of this utility model, a discharge port is provided at the lower end of the evaporator 4 for discharging waste residue inside the evaporator 4. In this utility model, when non-evaporable residue accumulates to a certain liquid level inside the evaporator 4, it can be discharged from the discharge port at the lower end of the evaporator 4.

[0045] According to a specific embodiment of this utility model, the evaporator 4 is equipped with a heating device, which is one or more of electric heating, steam heating, and thermal oil heating. This utility model ensures that the wastewater in the evaporator has sufficient heat for evaporation by providing a heating device.

[0046] According to a specific embodiment of the present invention, a metering pump 2 and a flow meter 3 are sequentially installed on the pipeline between the waste liquid storage tank 1 and the evaporator 4 along the material flow direction.

[0047] It should be noted that there are no special requirements for the metering pump and flow meter in this utility model. For example, the metering pump and flow meter commonly used in the prior art can be used, which will not be elaborated here.

[0048] According to a specific embodiment of this utility model, the material flow rate displayed by the flow meter 3 is matched with the power of the heating device in the evaporator 4. Adopting the aforementioned technical solution helps ensure that the material entering the evaporator 4 can be effectively evaporated.

[0049] According to a specific embodiment of this utility model, the flow rate of the metering pump 2 is regulated by the flow meter 3. In this utility model, the flow rate of the metering pump 2 can be adjusted by changing the value of the flow meter 3, so that the amount of material entering the evaporator 4 meets the material quantity required for evaporation.

[0050] According to a specific embodiment of the present invention, the condenser 5 is a tubular heat exchanger, with a cooling medium flowing inside the tubes and steam obtained from evaporation in the evaporator 4 flowing inside the shell. The steam is condensed into liquid water in the condenser 5 and then enters the liquid receiving tank 6.

[0051] According to a specific embodiment of this utility model, the receiving tank 6 is equipped with a level gauge to display the liquid level inside the receiving tank 6. This utility model can control the discharge and shut-off of liquid in the receiving tank 6 based on the liquid level displayed by the level gauge, thereby ensuring that the liquid condensed in the condenser 5 can smoothly enter the receiving tank 6 and have space for storage.

[0052] According to a specific embodiment of this utility model, the liquid receiving tank 6 is equipped with a thermometer to display the temperature of the condensed liquid inside the tank 6. In this utility model, the heat exchange effect of the condenser 5 can be determined based on the temperature value displayed by the thermometer.

[0053] According to a specific embodiment of this utility model, the liquid receiving tank 6 is equipped with a pressure gauge to display the pressure inside the liquid receiving tank 6. In this utility model, the pressure fluctuation inside the liquid receiving tank 6 can be determined based on the pressure value displayed by the pressure gauge.

[0054] According to a specific embodiment of this utility model, a drain line is provided at the lower end of the receiving tank 6 for discharging the distillate stored in the receiving tank 6; along the material flow direction, a valve and a pump are sequentially installed on the drain line to control the discharge of the distillate. In this utility model, when the liquid stored in the receiving tank 6 needs to be discharged, the valve and pump installed on the drain line can be opened. After the liquid is discharged, the valve and pump can be closed.

[0055] It should be noted that there are no special requirements for valves and pumps in this utility model. For example, commonly used valves and pumps in the prior art can be used, which will not be elaborated here.

[0056] According to a specific embodiment of the present invention, the liquid receiving tank 6 is provided with a vent for depressurization during maintenance or slag discharge.

[0057] According to a specific embodiment of this utility model, the upper end of the liquid receiving tank 6 is connected to a vacuum pump 7. In this utility model, the main function of the vacuum pump 7 is to evacuate the liquid receiving tank 6 to a vacuum level below 5 kPa.

[0058] In this invention, the vacuum pump 7 has no special requirements and can be any vacuum pump capable of evacuating to below 5 kPa, such as one or more of a liquid circulation pump, a Roots pump, and a claw pump.

[0059] According to a specific embodiment of the present invention, the vacuum pump 7 is provided with a gas vent for venting extracted gas.

[0060] According to a specific embodiment of this utility model, the treatment steps for amine liquid purification wastewater include:

[0061] S1) The amine purification wastewater is transported to the waste liquid storage tank 1, and then by the metering pump 2 to the evaporator 4 at a certain flow rate (controlled by the flow meter 3);

[0062] S2) When the liquid level in the evaporator 4 reaches the set liquid level, start the vacuum pump 7 to introduce high-temperature steam into the evaporator 4 to control the temperature and pressure in the evaporator.

[0063] S3) The steam evaporated in the evaporator 4 enters the condenser 5, and after cooling, it enters the liquid receiving tank 6 for storage. When the liquid level in the liquid receiving tank 6 reaches the set liquid level, the liquid receiving tank is started to drain the liquid.

[0064] S4) When the temperature, liquid level and pressure inside the evaporator 4 reach the set values, the evaporator is discharged.

[0065] The present invention will be described in detail below through embodiments;

[0066] In the following examples, the amine purification wastewater was taken from the amine ion exchange purification unit of the No. 1 Refining Plant of Sinopec Qingdao Refining & Chemical Company. The characteristics of the wastewater to be treated are shown in Table 1.

[0067] Table 1

[0068] project numerical values Characteristics Appearance black Colored substances pH >14 NaOH alkaline residue COD >100000mg / L Organic compounds such as amines, amino acids, and acid radicals

[0069] Example 1

[0070] S1) 10 tons of amine solution purification wastewater is discharged into waste liquid storage tank 1, and under the control of flow meter 3, it is transported to evaporator 4 by metering pump 2 at a flow rate of 5t / h.

[0071] S2) When the liquid level in the evaporator 4 reaches 300mm, the flow rate of the flow meter 3 is changed to 0.5t / h, the vacuum pump 7 is started, the vacuum pump pressure is controlled at 5kPa, and 150℃ steam is introduced into the evaporator 4 with a steam flow rate of 0.54t / h.

[0072] S3) The evaporated steam enters condenser 5, and circulating water is connected to condenser 5 with a flow rate of 40 m³ / h. 3 / h, the steam is cooled into liquid and then stored in the receiving tank 6. When the liquid level in the receiving tank 6 reaches the set level of 1000mm, the receiving tank drain pump and drain valve are started to drain the liquid.

[0073] S4) After 13 tanks of liquid are discharged from the receiving tank 6, the temperature in the evaporator 4 reaches 128℃, the liquid level is 400mm, and the pressure is 4.5kPa. At this time, stop the steam supply, shut down the vacuum pump, stop the liquid inlet, open the vent valve on the receiving tank 6, and discharge the slag from the evaporator when the equipment pressure becomes atmospheric pressure.

[0074] The liquid discharged from docking tank 6 was analyzed, and the results are shown in Table 2.

[0075] Table 2

[0076] project numerical values Characteristics Appearance Colorless and transparent pH 7-8 COD 430mg / L Very small amount of organic matter ammonia nitrogen 10mg / L

[0077] As can be seen from the results of the above embodiments, the amine liquid purification wastewater treatment device provided by this utility model can separate impurities such as heat-stable salts present in the amine liquid purification wastewater. The liquid obtained after treatment is colorless and transparent, with very low COD and ammonia nitrogen. It can be directly discharged or reused as amine liquid purification water, reducing the amount of demineralized water used in the factory. It can achieve amine liquid purification without waste liquid discharge and resource recycling.

[0078] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, including the combination of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A treatment device for amine-purified wastewater, characterized in that, The device includes: Waste liquid storage tank (1), evaporator (4), condenser (5) and receiving tank (6) are connected in series by pipelines. The amine purification wastewater stored in waste liquid storage tank (1) is first evaporated through evaporator (4). The vapor obtained by evaporation is cooled through condenser (5), and the cooled liquid enters receiving tank (6).

2. The processing apparatus according to claim 1, characterized in that, The waste liquid storage tank (1) is provided with a waste liquid storage tank inlet at the top, through which amine purification wastewater enters the waste liquid storage tank (1) for storage; and / or The waste liquid storage tank (1) is equipped with a level gauge to display the liquid level inside the waste liquid storage tank (1).

3. The processing apparatus according to claim 1, characterized in that, The evaporator (4) is equipped with a level gauge to display the liquid level inside the evaporator (4); and / or The evaporator (4) is equipped with a thermometer to display the temperature inside the evaporator (4); and / or The evaporator (4) is equipped with a pressure gauge to display the pressure inside the evaporator (4).

4. The processing apparatus according to claim 1, characterized in that, The evaporator (4) is equipped with a material mixer, which is one or more of a stirring paddle, a stirring motor, and a circulating pump; and / or The lower end of the evaporator (4) is provided with a discharge port for discharging the waste residue inside the evaporator (4).

5. The processing apparatus according to claim 1, characterized in that, The evaporator (4) is equipped with a heating device, which is one or more of electric heating, steam heating, and heat transfer oil heating.

6. The processing apparatus according to claim 1, characterized in that, Along the material flow direction, a metering pump (2) and a flow meter (3) are installed in sequence on the pipeline between the waste liquid storage tank (1) and the evaporator (4). The material flow rate displayed by the flow meter (3) is matched with the power of the heating device in the evaporator (4). The flow rate of the metering pump (2) is regulated by the flow meter (3).

7. The processing apparatus according to claim 1, characterized in that, The condenser (5) is a tubular heat exchanger. The cooling medium flows inside the tubes, and the steam obtained from the evaporation of the evaporator (4) flows inside the shell. The steam is condensed into liquid water in the condenser (5) and then enters the liquid receiving tank (6).

8. The processing apparatus according to claim 1, characterized in that, The receiving tank (6) is equipped with a level gauge to display the liquid level inside the receiving tank (6); and / or The receiving tank (6) is equipped with a thermometer to display the temperature of the condensate inside the receiving tank (6); and / or The receiving tank (6) is equipped with a pressure gauge to display the pressure inside the receiving tank (6).

9. The processing apparatus according to claim 1, characterized in that, A drain line is provided at the lower end of the receiving tank (6) for discharging the distillate stored in the receiving tank (6); along the material flow direction, valves and pumps are installed in sequence on the drain line for controlling the discharge of the distillate; and / or The receiving tank (6) is equipped with a vent for depressurization during maintenance or slag removal; and / or The upper end of the receiving tank (6) is connected to the vacuum pump (7).

10. The processing apparatus according to claim 9, characterized in that, The vacuum pump (7) is one or more of a liquid circulation pump, a Roots pump, and a claw pump; and / or The vacuum pump (7) is equipped with a gas vent for extracting and discharging gas.

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