A degradation simulation apparatus and degradation detection system for a solvent

Abstract

The application discloses a kind of degradation simulation device and degradation detection system of solvent.The degradation simulation device of solvent includes oxidation reactor, is equipped with solvent inlet, solvent outlet and gas inlet;Conveying pump, its input end is communicated solvent outlet;Heat exchanger, cold end inlet is communicated with the output end of conveying pump;Hot reactor, is provided with solvent inlet and solvent outlet, and solvent inlet is communicated with the cold end outlet of heat exchanger, and solvent outlet is communicated with the hot end inlet of heat exchanger;Condenser, is communicated with the hot end outlet of heat exchanger and oxidation reactor.The degradation simulation device can make carbon dioxide capture solvent oxidation degradation product expose in high temperature condition, and hot degradation product in hot reactor is exposed in dissolved oxygen due to circulating in oxidation reactor, and the solvent before entering hot reactor and the solvent before entering oxidation reactor are respectively sampled after entering hot reactor, and the hot degradation rate and oxidation degradation rate of carbon dioxide capture solvent can be calculated.

Description

Technical Field

[0001] This invention relates to the field of solvent degradation simulation technology, and more particularly to a solvent degradation simulation device and degradation detection system. Background Technology

[0002] Carbon capture and storage is considered an important means of reducing carbon dioxide emissions; currently, the most mature and widely used method for capturing carbon dioxide in industry is the organic amine chemical absorption method.

[0003] However, components such as oxygen coexisting with carbon dioxide in the flue gas can cause the amine solution to degrade through different mechanisms, leading to a decrease in carbon dioxide capture efficiency. At the same time, the byproducts produced corrode the capture device, resulting in amine loss and increased operating costs. In addition, since the desorption of the absorbent occurs under high temperature conditions, it will cause thermal degradation of the amine solution. Currently, there is no experimental equipment that can detect the overall degradation performance of the amine solution in the carbon dioxide capture process.

[0004] Therefore, how to detect the overall degradation performance of carbon dioxide capture solvents is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a solvent degradation simulation device and a degradation detection system to detect the overall degradation performance of carbon dioxide capture solvents.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A solvent degradation simulation device, comprising:

[0008] The oxidation reactor is equipped with a solvent inlet, a solvent outlet, and a gas inlet;

[0009] A delivery pump, the input of which is connected to the solvent outlet;

[0010] The heat exchanger has its cold end inlet connected to the output end of the delivery pump;

[0011] A thermal reactor is provided with a solvent inlet and a solvent outlet. The solvent inlet is connected to the cold end outlet of the heat exchanger, and the solvent outlet is connected to the hot end inlet of the heat exchanger.

[0012] A condenser that connects the hot end outlet of the heat exchanger to the oxidation reactor.

[0013] Optionally, in the above-mentioned solvent degradation simulation device, the oxidation reactor includes a stirrer and a rubber stopper;

[0014] The oxidation reactor has an opening at the top, a rubber plug is installed on the opening, and the rubber plug has a first mounting hole for fixing the agitator.

[0015] Optionally, in the above-mentioned solvent degradation simulation device, the oxidation reactor further includes a first thermometer and an air inlet pipe;

[0016] The rubber stopper has a second mounting hole for fixing the first thermometer and a third mounting hole for fixing the air inlet pipe. The end of the air inlet pipe passes through the mounting hole and is connected to the gas inlet.

[0017] Optionally, in the above-mentioned solvent degradation simulation device, the oxidation reactor is provided with a baffle plate, which divides the interior of the oxidation reactor into a stirring zone and a suspension zone arranged from top to bottom. The baffle plate is provided with a through hole connecting the stirring zone and the suspension zone, and the solvent outlet is located on the side wall of the suspension zone.

[0018] Optionally, in the solvent degradation simulation device described above, the heat exchanger is a tubular heat exchanger, and the heat exchanger has a 316 stainless steel shell.

[0019] Optionally, in the solvent degradation simulation device described above, the thermal reactor is made of U-shaped stainless steel tube and is heated by an oil bath.

[0020] Optionally, in the solvent degradation simulation device described above, the thermal reactor is equipped with a second thermometer; and / or, the outer surface of the thermal reactor is covered with a heat insulation layer.

[0021] A solvent degradation detection system includes a degradation simulation device as described above.

[0022] Optionally, the solvent degradation detection system described above also includes four solvent concentration detection instruments, namely a first solvent concentration detection instrument, a second solvent concentration detection instrument, a third solvent concentration detection instrument, and a fourth solvent concentration detection instrument.

[0023] The first solvent concentration detector and the second solvent concentration detector are respectively connected to the solvent inlet and the solvent outlet of the thermal reactor, and the third solvent concentration detector and the fourth solvent concentration detector are respectively connected to the solvent inlet and the solvent outlet of the oxidation reactor.

[0024] Optionally, in the solvent degradation detection system described above, the solvent concentration detection instrument is an online Fourier transform infrared spectrometer or an online gas chromatography-mass spectrometry system.

[0025] When using the solvent degradation simulation device provided by this invention, the solvent is introduced into the oxidation reactor through the solvent inlet, and a mixture of oxygen and carbon dioxide is introduced into the oxidation reactor through the gas inlet. This causes the solvent in the oxidation reactor to capture carbon dioxide gas under oxidative conditions, exposing the carbon dioxide-capturing solvent to oxidative degradation conditions, thus simulating the oxidative degradation environment of the solvent when capturing carbon dioxide. Then, a transfer pump pumps the solvent in the oxidation reactor to the cold end of a heat exchanger. The high-temperature solvent discharged from the hot reactor enters the hot end of the heat exchanger to facilitate heat exchange with the solvent at the cold end of the heat exchanger, achieving... The solvent is preheated and then enters a thermal reactor. The thermal reactor heats the solvent to a high temperature, causing it to absorb carbon dioxide and undergo thermal degradation under these conditions, simulating the thermal degradation environment of the solvent when capturing carbon dioxide. The solvent flowing out of the thermal reactor enters the hot end of a heat exchanger to exchange heat with the solvent entering the cold end of the heat exchanger. This preheats the solvent at the cold end of the heat exchanger while cooling the solvent at the hot end. Finally, the solvent flows through a condenser, where it is cooled to the required temperature before returning to the oxidation reactor, thus achieving solvent circulation.

[0026] Therefore, the solvent degradation simulation device provided by this invention can expose the carbon dioxide capture solvent to both oxidative and thermal degradation environments. The oxidative degradation products of the carbon dioxide capture solvent are exposed to high temperatures in the thermal reactor, while the thermal degradation products in the thermal reactor are exposed to dissolved oxygen due to circulation in the oxidative reactor. By sampling the solvent concentration before and after entering the thermal reactor, the thermal degradation rate can be calculated, and by sampling the solvent concentration before and after entering the oxidative reactor, the oxidative degradation rate can be calculated; thus, the overall degradation performance of the carbon dioxide capture solvent can be detected. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of a solvent degradation simulation device provided in an embodiment of the present invention.

[0029] Among them, 100 is an oxidation reactor, 101 is a stirrer, 102 is a baffle, 200 is a transfer pump, 300 is a heat exchanger, 400 is a thermal reactor, 401 is a second thermometer, and 500 is a condenser. Detailed Implementation

[0030] In view of this, the purpose of the present invention is to provide a solvent degradation simulation device and a degradation detection system to detect the overall degradation performance of carbon dioxide capture solvents.

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] like Figure 1 As shown in the figure, an embodiment of the present invention discloses a solvent degradation simulation device, including an oxidation reactor 100, a transfer pump 200, a heat exchanger 300, a thermal reactor 400, and a condenser 500.

[0033] The oxidation reactor 100 is provided with a solvent inlet, a solvent outlet and a gas inlet; the input end of the transfer pump 200 is connected to the solvent outlet; the cold end inlet of the heat exchanger 300 is connected to the output end of the transfer pump 200; the hot reactor 400 is provided with a solvent inlet and a solvent outlet, the solvent inlet is connected to the cold end outlet of the heat exchanger 300 and the solvent outlet is connected to the hot end inlet of the heat exchanger 300; the condenser 500 is connected to the hot end outlet of the heat exchanger 300 and the oxidation reactor 100.

[0034] When using the solvent degradation simulation device provided by this invention, the solvent is introduced into the oxidation reactor 100 through the solvent inlet, and a mixture of oxygen and carbon dioxide is introduced into the oxidation reactor 100 through the gas inlet. This causes the solvent in the oxidation reactor 100 to capture carbon dioxide gas under oxidative conditions, exposing the carbon dioxide-capturing solvent to oxidative degradation conditions, thus simulating the oxidative degradation environment of the solvent when capturing carbon dioxide. Then, the solvent in the oxidation reactor 100 is pumped to the cold end of the heat exchanger 300 by the transfer pump 200. The high-temperature solvent discharged from the hot reactor 400 enters the hot end of the heat exchanger 300 to facilitate heat exchange with the solvent at the cold end of the heat exchanger 300, thereby achieving the desired degradation environment. The solvent is preheated and then enters the thermal reactor 400. The thermal reactor 400 heats the solvent to a high temperature, causing the solvent to absorb carbon dioxide and undergo thermal degradation under high temperature conditions, simulating the thermal degradation environment of the solvent when capturing carbon dioxide. The solvent flowing out of the thermal reactor 400 enters the hot end of the heat exchanger 300 to exchange heat with the solvent entering the cold end of the heat exchanger 300. While preheating the solvent at the cold end of the heat exchanger 300, the solvent at the hot end of the heat exchanger 300 is cooled down. Finally, the solvent flows through the condenser 500, where it is cooled to the required temperature. The solvent then returns to the oxidation reactor 100, realizing the circulation of the solvent.

[0035] Therefore, the solvent degradation simulation device provided by this invention can expose the carbon dioxide capture solvent to both oxidative and thermal degradation environments. The oxidative degradation products of the carbon dioxide capture solvent are exposed to high temperatures in the thermal reactor 400, while the thermal degradation products in the thermal reactor 400 are exposed to dissolved oxygen due to circulation in the oxidation reactor 100. By sampling the solvent concentration before and after entering the thermal reactor 400, the thermal degradation rate can be calculated. By sampling the solvent concentration before and after entering the oxidation reactor 100, the oxidative degradation rate can be calculated. Thus, the overall degradation performance of the carbon dioxide capture solvent can be detected.

[0036] It should be noted that the cold end and hot end of the heat exchanger 300 mentioned above refer to the two opposite ends of the heat exchanger. The cold end is the relatively low temperature end of the heat exchanger 300, and the hot end is the relatively high temperature end of the heat exchanger 300.

[0037] Specifically, the thermal degradation rate α of the organic amine solvent is calculated using the following formula:

[0038]

[0039] Where c1 is the concentration of the organic amine solvent before entering the thermal reactor 400, in mol / L; and c2 is the concentration of the organic amine solvent after exiting the thermal reactor 400, in mol / L.

[0040] The oxidative degradation rate β of organic amine solvents is calculated using the following formula:

[0041]

[0042] Where c1′ is the concentration of the organic amine solvent before entering the oxidation reactor 100, in mol / L; and c2′ is the concentration of the organic amine solvent after exiting the oxidation reactor 100, in mol / L.

[0043] Furthermore, the oxidation reactor 100 includes a stirrer 101 and a rubber stopper; wherein, the top of the oxidation reactor 100 is provided with an opening, the rubber stopper is installed on the opening, and the rubber stopper is provided with a first mounting hole for fixing the stirrer 101, so as to install the rubber stopper on the opening of the oxidation reactor 100 and fix the stirrer 101 by the rubber stopper. As the blades of the stirrer 101 rotate at high speed, vortices are generated on the surface of the solvent, and oxygen is highly dissolved in the solvent, forming the conditions for solution oxidation.

[0044] It should be understood that the present invention does not specifically limit the stirring rate of the stirrer 101 and the gas flow rate of the oxygen and carbon dioxide mixture. Any setting method that can meet the requirements of degradation simulation is within the protection scope of the present invention. Optionally, the stirring rate of the stirrer 101 provided in the embodiment of the present invention is 1440 rpm, and the gas flow rate of the oxygen and carbon dioxide mixture is 100 ml / min.

[0045] In addition, the oxidation reactor 100 also includes a first thermometer and an inlet pipe; wherein, the rubber stopper is provided with a second mounting hole for fixing the first thermometer and a third mounting hole for fixing the inlet pipe, and the end of the inlet pipe passes through the mounting hole and is connected to the gas inlet so as to install the first thermometer on the rubber stopper, detect the temperature inside the oxidation reactor 100 through the first thermometer, and introduce a mixture of oxygen and carbon dioxide into the oxidation reactor 100 through the inlet pipe.

[0046] It should be noted that the present invention does not specifically limit the temperature inside the oxidation reactor 100. Any temperature that can meet the degradation detection requirements is within the protection scope of the present invention. Optionally, the temperature of the oxidation reactor 100 provided in the embodiments of the present invention is controlled between 50°C and 55°C during each cycle simulation.

[0047] The oxidation reactor 100 is equipped with a baffle 102 to divide the interior of the oxidation reactor 100 into a stirring zone and a suspension zone arranged from top to bottom. The baffle 102 is provided with through holes connecting the stirring zone and the suspension zone to reduce the stirring energy entering the suspension zone and reduce the impact of air bubbles being carried into the suspension zone. The solvent outlet is located on the side wall of the suspension zone to discharge the oxidized and degraded solvent from the oxidation reactor 100 and to detect the concentration of the oxidized and degraded solvent.

[0048] It should be understood that the present invention does not specifically limit the solvent of the oxidation reactor 100, nor the volume of the stirring zone and the suspension zone. Any volume that can meet the usage requirements is within the scope of protection of the present invention. Optionally, the oxidation reactor 100 provided in the embodiment of the present invention is composed of a glass tube with an inner diameter of 80 mm, a total volume of 750 ml, a suspension zone solvent of 330 ml, a stirring zone solvent of 400 ml, and a 20 ml non-working area reserved at the top of the stirring zone and the top of the oxidation reactor 100.

[0049] Furthermore, the glass tube of the oxidation reactor 100 is provided with a molten glass hole with a diameter of 3 mm. This molten glass hole is the solvent inlet of the oxidation reactor 100, through which organic amine solvent is introduced into the oxidation reactor 100.

[0050] In addition, the heat exchanger 300 provided by the present invention can be a plate heat exchanger 300 or a tube heat exchanger 300, etc., as long as the type can meet the usage requirements, it is within the protection scope of the present invention; Optionally, the heat exchanger 300 provided in the embodiment of the present invention is a tube heat exchanger 300, and the heat exchanger 300 adopts a 316 stainless steel shell.

[0051] The thermal reactor 400 provided by the present invention is made of U-shaped stainless steel tube with a length of 21.5 inches and a volume of 0.13L. The thermal reactor 400 is heated by oil bath so that the solvent passes through the pipe in one go and the solvent in the pipe is heated evenly, while the solvent is in a high temperature environment.

[0052] Furthermore, the thermal reactor 400 is provided with a second thermometer 401 to detect the temperature of the thermal reactor 400 and control the temperature inside the thermal reactor 400 at 110℃-120℃; and / or, the outer surface of the thermal reactor 400 is covered with a heat insulation layer to reduce heat loss from the thermal reactor 400 and improve the heating efficiency of the thermal reactor 400.

[0053] In addition, the present invention also discloses a solvent degradation detection system, including the solvent degradation simulation device described above, thus possessing all the technical effects of the solvent degradation simulation device described above, which will not be elaborated on here.

[0054] It should be noted that the above degradation detection system can set sampling points at the solvent inlet and solvent outlet of the oxidation reactor 100 and the solvent inlet and solvent outlet of the thermal reactor 400 respectively. After sampling at the sampling points, the concentration at each sampling point is detected by ion chromatography, and then the thermal degradation rate and oxidative degradation rate are calculated respectively. Alternatively, online concentration detection instruments can be set at the above sampling points to realize online detection of solvent degradation.

[0055] Optionally, the degradation detection system provided in this embodiment of the invention further includes four solvent concentration detection instruments: a first solvent concentration detection instrument, a second solvent concentration detection instrument, a third solvent concentration detection instrument, and a fourth solvent concentration detection instrument. The first and second solvent concentration detection instruments are respectively connected to the solvent inlet and solvent outlet of the thermal reactor 400, so as to detect the solvent concentration before and after the thermal reactor 400. The third and fourth solvent concentration detection instruments are respectively connected to the solvent inlet and solvent outlet of the oxidation reactor 100, so as to detect the solvent concentration before and after the oxidation reactor 100, thereby achieving online detection of solvent degradation and improving detection efficiency.

[0056] The solvent concentration detection instrument mentioned above can be an online Fourier transform infrared spectrometer or an online GC-MS (GC-MS is an abbreviation for Gas Chromatography-Mass Spectrometer, referring to a gas chromatography-mass spectrometry instrument), etc. Any type that can meet the requirements of online degradation detection is within the scope of protection of this invention.

[0057] The terms "first" and "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units may include steps or units not listed, but rather steps or units not listed.

[0058] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A solvent degradation simulation device, characterized in that, include: The oxidation reactor is equipped with a solvent inlet, a solvent outlet, and a gas inlet; A delivery pump, the input of which is connected to the solvent outlet; The heat exchanger has its cold end inlet connected to the output end of the delivery pump; A thermal reactor is provided with a solvent inlet and a solvent outlet. The solvent inlet is connected to the cold end outlet of the heat exchanger, and the solvent outlet is connected to the hot end inlet of the heat exchanger. A condenser is connected to the hot end outlet of the heat exchanger and the oxidation reactor; the oxidation reactor is equipped with a baffle plate that divides the interior of the oxidation reactor into a stirring zone and a suspension zone arranged from top to bottom. The baffle plate is provided with a through hole connecting the stirring zone and the suspension zone, and the solvent outlet is located on the side wall of the suspension zone.

2. The solvent degradation simulation device according to claim 1, characterized in that, The oxidation reactor includes a stirrer and a rubber stopper; The oxidation reactor has an opening at the top, a rubber plug is installed on the opening, and the rubber plug has a first mounting hole for fixing the agitator.

3. The solvent degradation simulation device according to claim 2, characterized in that, The oxidation reactor also includes a first thermometer and an air inlet pipe; The rubber stopper has a second mounting hole for fixing the first thermometer and a third mounting hole for fixing the air inlet pipe. The end of the air inlet pipe passes through the mounting hole and is connected to the gas inlet.

4. The solvent degradation simulation device according to claim 1, characterized in that, The heat exchanger is a tubular heat exchanger, and the heat exchanger has a stainless steel shell.

5. The solvent degradation simulation device according to claim 1, characterized in that, The thermal reactor is made of U-shaped stainless steel tubing and is heated by an oil bath.

6. The solvent degradation simulation device according to claim 1, characterized in that, The thermal reactor is equipped with a second thermometer; and / or, the outer surface of the thermal reactor is covered with a heat insulation layer.

7. A solvent degradation detection system, characterized in that, Includes the degradation simulation device as described in any one of claims 1 to 6.

8. The degradation detection system according to claim 7, characterized in that, It also includes solvent concentration detection instruments, of which there are four: a first solvent concentration detection instrument, a second solvent concentration detection instrument, a third solvent concentration detection instrument, and a fourth solvent concentration detection instrument. The first solvent concentration detector and the second solvent concentration detector are respectively connected to the solvent inlet and the solvent outlet of the thermal reactor, and the third solvent concentration detector and the fourth solvent concentration detector are respectively connected to the solvent inlet and the solvent outlet of the oxidation reactor.

9. The degradation detection system according to claim 8, characterized in that, The solvent concentration detection instrument is an online Fourier transform infrared spectrometer or an online gas chromatography-mass spectrometry system.

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