Gas-liquid mixed multiple absorption desulfurization and decarbonization waste gas treatment process

Abstract

The application discloses a kind of gas-liquid mixing multiple absorption desulfurization and decarbonization waste gas treatment processes, and relates to a kind of waste gas treatment processes, and the application is completed by multiple impingement occurring inside gas-liquid absorption process, when working, gas and liquid are pre-mixed after being sprayed out by nozzle, multiple impingement of bubble jet occurs in impinging stream reactor, in addition, ultrasonic is strengthened bubble breaking, gas-liquid is fully contacted, realizes primary absorption.Secondary absorber is passed through, and multiple impingement is realized by four nozzles to realize secondary absorption.Ultrasonic coupling multiple impinging stream technology greatly improves the residence time of gas in reactor, multiple broken bubbles increase gas-liquid contact area, and enhance absorption effect, which is suitable for large-scale treatment of industrial waste gas in industry, and the absorbent can be reused, saving cost and avoiding waste.The overall cost is low, easy to maintain, simple to operate, and high safety factor.

Description

TECHNICAL FIELD

[0001] The present application relates to a waste gas treatment process, in particular to a process and device for ultrasonic coupling multi-impinging stream technology gas-liquid absorption desulfurization and carbon removal. BACKGROUND

[0002] Impinging stream is a technology that can efficiently enhance the gas-liquid mass transfer characteristics. Its main principle is to use the highly turbulent region formed by the mutual impingement of two or more streams to enhance the mass transfer between two or more phases. Therefore, it is widely used in the fields of ultrafine powder preparation, combustion, drying, extraction and absorption, etc.

[0003] The mixing process in the impinging stream reactor mainly relies on molecular diffusion, turbulent diffusion and shear dispersion. When molecules move randomly, they are disturbed, collide with each other and accumulate molecular energy, creating a good environment for physical mixing of gas-liquid two phases and chemical reaction.

[0004] Global climate change has posed a great threat to human production and life. From the energy supply system to the energy consumption industry, a large part of major infrastructure needs to be upgraded through technological innovation. Traditional energy regions dominated by coal, high energy consumption regions, etc. need new devices to treat carbon and sulfur pollution gases generated by fuels, which will save a considerable amount of cost and alleviate the huge impact of the rapid transformation of leading industries on the local economy. The existing absorption devices are constantly optimized in terms of absorption efficiency, industrial applicability and cost, etc.

[0005] Impinging stream technology has great application potential in industry. Its strong microscopic mixing, high gas-liquid mass transfer coefficient and large specific area when gas and liquid are mixed are all conducive to the absorption of the gas to be absorbed. It is particularly beneficial for the treatment of carbon and sulfur pollution gases. It can not only greatly improve the absorption efficiency and make the absorbed gas product more fresh, but also can reuse the absorbent to achieve the highest utilization rate, greatly saving the cost. On the basis of combining the impinging stream's strong mixing and mass transfer characteristics, a process and device for ultrasonic coupling multi-impinging stream technology gas-liquid absorption desulfurization and carbon removal are proposed for large-scale and efficient industrial treatment of harmful gases. SUMMARY

[0006] The present application aims to provide a gas-liquid mixed multiple absorption desulfurization and decarbonization waste gas treatment process, which uses a multiple impact technology to fully absorb harmful gases according to the characteristics of liquid absorbing gas.

[0007] The present application aims to provide a gas-liquid mixed multiple absorption desulfurization and decarbonization waste gas treatment process, which uses a multiple impact technology to fully absorb harmful gases according to the characteristics of liquid absorbing gas.

[0008] The present application aims to provide a gas-liquid mixed multiple absorption desulfurization and decarbonization waste gas treatment process, which uses a multiple impact technology to fully absorb harmful gases according to the characteristics of liquid absorbing gas.

[0009] After the device is assembled, the power is turned on, and the NaOH aqueous solution in the feed barrel is sprayed out through the electromagnetic flowmeter and the inner mixing type atomizing nozzle; then the valve is opened, and the CO2 and SO2 containing gas to be absorbed is mixed with the NaOH aqueous solution through the inner mixing type atomizing nozzle and sprayed out, and the mixture is subjected to impact in the impinging stream reactor; after the impact, the gas bubbles rise due to the small density and impact the first guide plate, pass through the first guide plate and impact the second guide plate, and are broken by the ultrasonic waves emitted by the ultrasonic vibrator at the tail of the first guide plate; after being guided by the second guide plate, the gas bubbles impact the third guide plate, and then enter the wall flow area of the blender after being guided by the third guide plate; in the process, the gas bubbles are disturbed by the ultrasonic vibrator at the tail of the second guide plate, the third guide plate and the tail; after the gas bubbles hit the wall and pass through the demisting piece, they enter the secondary absorber, and the NaOH aqueous solution above the outlet pipe flows into the absorbent collection barrel controlled by the water level controller; after the gas enters the secondary absorber, it collides with the NaOH aqueous solution entering from the liquid inlet under the restriction of the baffle, and finally the gas passes through the demisting piece and enters the gas collection bottle; the absorbed gas is continuously collected for detection, and after the quality is determined to be qualified and meets the gas emission standard, it can be discharged.

[0010] The present application aims to provide a gas-liquid mixed multiple absorption desulfurization and decarbonization waste gas treatment process, which uses a multiple impact technology to fully absorb harmful gases according to the characteristics of liquid absorbing gas.

[0011] The gas-liquid mixed multiple absorption desulfurization and decarbonization waste gas treatment process, the secondary absorber is internally provided with a four-nozzle structure, and the multiple nozzle jet collision in the limited area promotes gas-liquid mixing, absorbs the gas which is not completely absorbed, and finally obtains the gas with high quality.

[0012] The gas-liquid mixed multiple absorption desulfurization and decarbonization waste gas treatment process, the ultrasonic coupling multiple impact is multiple impact after gas-liquid contact, and the ultrasonic strengthening is additionally provided, so that the bubbles sliding out of the guide plate are broken multiple times, the gas-liquid absorption area and the residence time are increased.

[0013] The gas-liquid mixed multiple absorption desulfurization and decarbonization waste gas treatment process, the reaction device uses the recycled absorbent, and the quality of the gas is detected in the middle reaction process, so that the quality of the filtered gas meets the standard.

[0014] The advantages and effects of the present application are as follows:

[0015] 1. The present application is based on the characteristics of liquid absorbing gas, and the method for fully absorbing by using multiple impact technology is provided. The impact flow reactor used in the process is provided with specially designed internal mixing type atomizing nozzles on both sides, so that the gas and the liquid can be preliminarily mixed in the nozzles, the double-channel structure in the nozzles can make the gas-liquid mixing more sufficient, and the input gas-liquid pressure is controllable to realize controllable nozzle input.

[0016] 2. The process of the present application utilizes three guide plates, an ultrasonic generator and a stirrer to promote multiple impact of the absorbed gas and the absorbent liquid, break the bubbles, increase the absorption area and improve the absorption efficiency.

[0017] 3. The secondary absorber of the process of the present application is convenient for sampling and detecting the intermediate results of the absorbed gas, and the absorbent can be timely adjusted according to different component gases. The reactor can find the best absorbent ratio for different component gases by adjusting the gas-liquid ratio of the opposite nozzles, so that the absorption efficiency is greatly improved. The process technology is suitable for large-scale treatment of industrial waste gas in industry, the absorbent can be reused, the cost is saved, waste is avoided, the overall cost is low, maintenance is easy, operation is simple, and the safety factor is high. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The overall process flowchart of the present application is shown in the figure;

[0019] Figure 2 The cross-sectional view of the internal mixing type atomizing nozzle of the impact flow reactor used in the present application is shown in the figure;

[0020] Figure 3 The cross-sectional view of the secondary absorber of the present application is shown in the figure;

[0021] Figure 4 The present applicationFigure 3 A-A cross-sectional view.

[0022] Figure: 1-impinging stream reactor, 2-outlet connector, 3-ultrasonic generator, 4-water level controller, 5-mixer, 6-ultrasonic transducer, 7-inner mixed atomizing nozzle, 8-pressure gauge, 9-gas storage tank, 10-absorbent collection bucket, 11-centrifugal pump, 12-feeding bucket, 13-second feeding bucket, 14-absorbent collection bucket two, 15-secondary absorber, 16-electromagnetic flowmeter, 17-first guide vane, 18-second guide vane, 19-third guide vane, 20-valve, 21-gas collecting bottle, 22-demister, 23-nozzle sliding head, 24-nozzle head outer thread, 25-liquid second channel, 26-shoulder, 27-nozzle tail outer thread, 28-spring, 29-spacer, 30-airway inner thread, 31-air inlet, 32-liquid inlet, 33-demister, 34-gas inlet, 35-baffle, 36-liquid inlet. DETAILED DESCRIPTION

[0023] The application will be described in detail below with reference to the embodiments shown in the drawings.

[0024] In order to improve the desulfurization and decarbonization efficiency, the application provides a process method with better desulfurization and decarbonization effect and higher absorption efficiency by combining impinging stream gas-liquid absorption technology.

[0025] The process of the application realizes desulfurization and decarbonization by ultrasonic coupling multiple impingement technology. Multiple impingement prolongs the residence time of gas in liquid, and ultrasonic strengthening bubble breaking increases the gas-liquid contact area. The impinging stream reactor required by the device is composed of a special design shape cylinder and a head. The cylinder is provided with a specially designed inner mixed atomizing nozzle, an ultrasonic transducer, a mixer and a discharge port, and is internally provided with three guide vanes with different angles. Two feeding nozzles are horizontally opposite; the ultrasonic transducer is installed at the tail end of each guide vane; the mixer is opposite to the protruding part of the cylinder; the liquid discharge port is located at the bottom end of the reactor, and the gas outlet is located at the uppermost part of the reactor. A demister is installed at the top of the reactor to remove water vapor mixed in the gas, and a water level controller is installed at the side liquid outlet. The nozzle structure is special, which can realize the first mixing of gas and liquid inside, and then spray the gas-liquid mixture after mixing to occur impingement, which is convenient for gas-liquid absorption.

[0026] The feeding nozzles of the impinging flow reactor of the application can realize the first impinging mixing in the nozzles, the second impinging mixing after being sprayed out of the nozzles, three impinging through the three guide plates, one impinging under the action of the stirrer, and one impinging at the bottom four nozzles after the bubbles enter the secondary absorber from the upper gas outlet. Multiple impinging occurs in the whole reaction process, and the bubbles formed by the absorbed gas are broken and processed every time, which continuously refines the bubbles, increases the absorption area, and greatly improves the absorption efficiency.

[0027] The application will be described in detail below with specific examples.

[0028] The working process of the ultrasonic coupling multiple impinging flow technology gas-liquid absorption desulfurization and decarbonization is as follows: after the device is assembled, the power is turned on. The NaOH aqueous solution in the feeding barrel 12 is sprayed out by the inner mixing type atomizing nozzle 7 after being adjusted by the electromagnetic flowmeter 16 through the centrifugal pump 11. Then the valve is opened, and the CO2 and SO2 containing gas to be absorbed is mixed with the NaOH aqueous solution from the gas storage tank 9 through the inner mixing type atomizing nozzle 7 after being displayed by the pressure gauge 8, and then sprayed out and impinged in the novel impinging flow reactor 1. After impinging, the bubbles rise and impinge on the first guide plate 17 due to the small density, are guided and impinged on the second guide plate 18 through the first guide plate 17, are broken by the ultrasonic waves emitted by the ultrasonic vibrator 6 at the tail of the first guide plate 17, are guided and impinged on the third guide plate 19 after being guided by the second guide plate 18, and enter the wall flow area of the stirrer 5 after being guided by the third guide plate 19. In the process, the tail of the second guide plate 18 and the third guide plate 19 are disturbed by the ultrasonic vibrator 6. After the bubbles impinge on the wall, they enter the secondary absorber 15 after being defogged by the defogging piece 22, and the NaOH aqueous solution higher than the outlet pipe 2 flows into the absorbent collecting barrel 10 under the control of the water level controller 4. After the gas enters the secondary absorber 15, it is impinged by the four jets under the restriction of the baffle 35 after entering the secondary absorber 15 through the gas inlet 34 and the NaOH aqueous solution entering from the liquid inlet 36, and finally enters the gas collection bottle 21 after being defogged by the defogging piece 33. The absorbed gas is continuously collected for detection, and is discharged after determining that its quality is qualified and meets the gas emission standard.

[0029] The device of the application fixes the nozzle on the impinging flow reactor through the nozzle head outer thread 24 and the shoulder 26, and connects the gas pipeline and the liquid pipeline on the nozzle through the gas channel inner thread 30 and the nozzle tail outer thread 27 respectively. After proper preparation, the reaction starts, the valve 20 is opened, the absorbent liquid is pumped out from the feeding barrel 12, the flow is adjusted by the centrifugal pump 11 and the electromagnetic flowmeter 16, and then enters the inner mixing type atomizing nozzle 7. At the same time, the gas to be absorbed enters the inner mixing type nozzle 7 from the gas storage tank 9 after being displayed by the pressure gauge 8, mixes with the liquid, the ultrasonic generator 3 is turned on to disturb through the ultrasonic vibrator 6, and the blades of the stirrer 5 start to rotate.

[0030] In the interior of the internal mixing atomizing nozzle 7, liquid enters from the liquid inlet 32 and gas enters from the gas inlet 31. The liquid is divided from the main channel and the liquid second channel 25, and the gas is divided by the partition 29. Under the action of pressure, the nozzle sliding head 23 extrudes the spring 28, and the gas-liquid mixture is sprayed from the nozzle.

[0031] After the material is mixed in the internal mixing nozzle 7, the atomized material is sprayed out and collides in the cavity. At the beginning, the gas-liquid mixture collides, and the gas continuously rises through the first guide plate 17, the second guide plate 18, and the third guide plate 19, which form an "S" shaped channel. The gas is continuously disturbed by ultrasonic waves, and is stirred again when it reaches the stirrer part. Finally, it enters the secondary absorber 15 through the gas outlet at the top of the impinging stream reactor 1, and the liquid absorbent is extracted from the centrifugal pump 11 through the liquid inlet 36 into the secondary absorber 15. The gas entering from the gas inlet 34 collides with the liquid in the secondary absorber 15 under the blockage of the baffle 35, and finally, the mist is removed by the demisting piece 33 and enters the gas collection bottle 21 from the uppermost outlet. Finally, the gas is sampled and detected in the gas collection bottle 21. If the gas quality meets the emission standard, it is discharged.

[0032] After a period of time after the reaction starts, the bubbles generated by the mixing of the gas and the liquid rise in the absorption liquid in the cavity of the new impinging stream reactor 1. The "S" shaped channel formed by the third guide plate greatly increases the contact time of the absorbed gas and the absorption liquid. The bubbles are broken again by the ultrasonic waves emitted by the ultrasonic vibrator 6 every time they leave the guide plate, greatly increasing the contact area of the absorbed gas and the absorption liquid. After flowing out of the third guide plate, the bubbles enter the stirring range of the stirrer 5, are disturbed by the stirrer, and then collide with the wall, enter the grooves in the wall of the reactor, and are broken again. Finally, they pass through the demisting piece 22, enter the secondary absorber 15 through the gas inlet 34 at the top of the reactor, and are broken again by the absorption liquid after being sprayed out of the four nozzles. Finally, the mist is removed by the demisting piece 33 and enters the gas collection bottle 21. During this time, the new impinging stream reactor 1 and the secondary absorber 15 are controlled by the water level controller 4 to fix the liquid level in them. When the liquid increases, the excess absorption liquid flows out through the outlet connection pipe into the absorption liquid collection barrel 10 and the absorption liquid collection barrel 14. After the gas absorption is completed, the absorption liquid in the device can be discharged from the outlet at the bottom of the device. After the absorption is completed, the gas is detected and discharged after meeting the standard.

[0033] The above examples are only used to illustrate the technical solutions of the present application and not to limit it. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the present application, and they should be covered by the scope of the claims of the present application.

Claims

1. A gas-liquid hybrid multi-stage absorption desulfurization and decarbonization exhaust gas treatment process, characterized by, The process of gas-liquid absorption desulfurization and decarbonization is as follows: After the device is assembled, the power is turned on, and the required impinging stream reactor of the device is composed of a cylinder and a head; the cylinder is provided with an internal mixing type atomizing nozzle, an ultrasonic transducer, a stirrer and a discharge port, and is internally provided with three guide plates with different angles, two feed port nozzles are horizontally opposite; the ultrasonic transducer is installed at the tail end of each guide plate; the stirrer is opposite to the protruding part of the cylinder; the liquid discharge port is located at the bottom end of the reactor, and the gas outlet is located at the uppermost part of the reactor, a demisting piece is arranged at the upper part of the reactor to remove water vapor mixed in the gas, and a water level controller is arranged at the side liquid outlet; the NaOH aqueous solution in the feed barrel (12) is sprayed out through the internal mixing type atomizing nozzle (7) after being adjusted by the electromagnetic flowmeter (16) through the centrifugal pump (11); then the valve is opened, the CO2 and SO2 containing gas to be absorbed is mixed with the NaOH aqueous solution through the internal mixing type atomizing nozzle (7) after being displayed by the pressure gauge (8) from the gas storage tank (9), and is sprayed out together, and impingement is carried out in the impinging stream reactor (1); after impingement, the gas bubbles rise and impinge on the first guide plate (17) due to small density, pass through the first guide plate (17) to impinge on the second guide plate (18), are broken by the ultrasonic waves emitted by the ultrasonic transducer (6) at the tail end of the first guide plate (17), impinge on the third guide plate (19) after being guided by the second guide plate (18), and enter the wall flow area of the stirrer (5) after being guided by the third guide plate (19); in the process, the tail end of the second guide plate (18) and the third guide plate (19) are disturbed by the ultrasonic transducer (6); the impinging stream reactor (1) and the secondary absorber (15) are controlled by the water level controller, so that the liquid level in the two is fixed; when the liquid continuously increases, the excess absorption liquid will flow out through the outlet connecting pipe into the absorbent collecting barrel (10) and the absorbent collecting barrel two (14); after the gas bubbles impinge on the wall, the demisting piece (22) is used for demisting, and then the gas bubbles enter the secondary absorber (15); the NaOH aqueous solution higher than the outlet connecting pipe (2) flows into the absorbent collecting barrel (10) through the water level controller (4); After the gas enters the secondary absorber (15), the NaOH aqueous solution entering from the liquid inlet (36) and the gas inlet (34) impinge on each other under the limitation of the baffle (35), and finally the gas is demisted by the demisting piece (33) and enters the gas collecting bottle (21); the absorbed gas is continuously collected for detection, and is discharged after the quality is determined to be qualified and meets the gas emission standard; Wherein; The internal mixing type atomizing nozzle is a double-channel structure for liquid and gas, so that the gas and liquid are premixed in the nozzle and sprayed out after atomization; the sprayed gas is absorbed by ultrasonic coupling multiple impingement in the reactor; The secondary absorber is a four-nozzle structure, and the multiple nozzle jet collision in the limited area promotes the mixing of gas and liquid, and absorbs the gas not absorbed completely.

2. A gas-liquid mixed multiple absorption desulfurization and decarbonization waste gas treatment process according to claim 1, characterized in that, The ultrasonic coupling multiple impact is multiple impact after gas-liquid contact, plus ultrasonic strengthening, multiple breaking of the bubble sliding out of the guide plate, increase of gas-liquid absorption area and residence time.

3. The gas-liquid hybrid multi-stage absorption desulfurization and decarbonization flue gas treatment process according to claim 1, characterized in that, The absorbent is recycled, and in the middle reaction process, the gas is detected in quality, so as to ensure that the quality of the filtered gas meets the standard.

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