Carbon dioxide recovery device for hydrogen production from methanol steam

Abstract

The invention discloses a methanol steam hydrogen production carbon dioxide recovery device, and relates to the technical field of methanol steam hydrogen production carbon dioxide recovery. The device comprises a base, an airflow speed reduction assembly and an efficient cooling assembly, the left side of the top of the base is fixedly connected with a multi-stage compression mechanism, and the front side of the multi-stage compression mechanism communicates with a Y-shaped pipe through a guide pipe. Through the airflow speed reduction assembly, two strands of high-pressure airflow collide with each other and are converted into turbulent flow energy through opposite impact of flow division of a Y-shaped pipe in the buffer box, the gas flow speed is effectively reduced, the unfolding angle of the spoiler is adjusted in cooperation with the driving mechanism, the gas flow path is further limited, and the residence time of gas in the heat exchanger body is prolonged; the heat exchanger provides sufficient reaction time for heat exchange, solves the problem of insufficient heat exchange time caused by too fast gas flow speed in a traditional device by slowing down the flow speed of high-pressure gas, and ensures that the gas can be in full contact with a refrigerant when entering the heat exchanger body.

Description

Technical Field

[0001] The invention belongs to the technical field of carbon dioxide recovery from methanol-water vapor hydrogen production, and in particular relates to a carbon dioxide recovery device for methanol-water vapor hydrogen production. Background Art

[0002] Methanol-water vapor hydrogen production carbon dioxide recovery refers to the technology of separating and capturing the reaction by-product carbon dioxide through physical or chemical methods during the methanol hydrogen production process, purifying the carbon dioxide from the mixed gas and compressing it for storage or reuse. The recovered carbon dioxide can be used in the food industry, chemical raw materials or carbon sequestration, reducing greenhouse gas emissions.

[0003] In existing methanol-water vapor hydrogen production devices, the carbon dioxide recovery system generally adopts compression condensation technology, which uses the principles of multi-stage compression and low-temperature condensation to gradually separate and liquefy carbon dioxide from the mixed gas by reducing the pressure and temperature in steps. The low-temperature condensation separation exchanges heat between the high-pressure gas and the low-temperature fluid to reduce its temperature. The traditional method is to use a heat exchanger for cooling, but when the gas is under high pressure, its density increases and the flow rate accelerates, resulting in a shortened gas heat exchange time, a decrease in heat exchange efficiency, and difficulty in reaching the liquefaction temperature of carbon dioxide within the predetermined time, affecting the recovery efficiency of liquefied carbon dioxide and being unfavorable for use.

[0004] To this end, we provide a methanol-water vapor hydrogen production and carbon dioxide recovery device to solve the above problems. Summary of the Invention

[0005] The object of the present invention is to provide a methanol-water vapor hydrogen production carbon dioxide recovery device. Through the cooperation of an airflow deceleration component and a high-efficiency cooling component, the present invention solves the problem in the prior art of methanol-water vapor hydrogen production carbon dioxide recovery devices that the airflow velocity is too fast when cooling the high-pressure gas, resulting in a shortened gas heat exchange time and a decreased heat exchange efficiency, making it difficult for carbon dioxide to reach the liquefaction temperature within the predetermined time, thereby affecting the recovery efficiency of liquefied carbon dioxide.

[0006] To solve the above technical problems, the present invention is implemented through the following technical solutions.

[0007] The present invention discloses a device for recovering carbon dioxide from methanol-water vapor hydrogen production, comprising a base, an airflow deceleration component and a high-efficiency cooling component. The left side of the top of the base is fixedly connected to a multi-stage compression mechanism, and the front side of the multi-stage compression mechanism is connected to a Y-shaped tube through a conduit. The airflow deceleration component comprises a buffer box, the bottom of the buffer box is fixedly connected to the base, both sides of the buffer box are connected to the Y-shaped tube, the top and bottom of the right side of the inner cavity of the buffer box are movably connected to a baffle, the left side of the baffle passes through the buffer box and is fixedly connected to a driven gear, and the left side of the rear side of the buffer box is fixedly connected to a driving mechanism. The high-efficiency cooling component comprises a heat exchanger body, the front side of the heat exchanger body is connected to the buffer box, the bottom of the heat exchanger body is connected to a sealing shell, the left side of the sealing shell is fixedly connected to a rotating motor, the right side of the output end of the rotating motor passes through the sealing shell and is fixedly connected to a high-pressure nozzle, the right side of the bottom of the heat exchanger body is connected to a pump body, and the water outlet at the bottom of the pump body passes through the sealing shell and is connected to the high-pressure nozzle through a rotating joint.

[0008] The present invention is further configured such that the multi-stage compression mechanism includes a primary compression tank, a secondary compression tank is fixedly connected to the bottom of the primary compression tank, the bottom of the secondary compression tank is fixedly connected to the base, a radiator is fixedly connected to the right side of the secondary compression tank, the front side of the primary compression tank is connected to the radiator, the rear side of the radiator is connected to the secondary compression tank, the front side of the secondary compression tank is connected to the Y-shaped tube, the primary compression tank is used to pressurize the gas, compress the gas to a certain pressure and increase its temperature, and then the radiator lowers the gas temperature to prevent it from being too high, and the secondary compression tank pressurizes the gas again to make it close to the critical pressure value of carbon dioxide.

[0009] The present invention is further configured as follows: the driving mechanism includes a mounting frame, the front side of the mounting frame is fixedly connected to the buffer box, the left side of the mounting frame is fixedly connected to a servo motor, the right side of the output end of the servo motor passes through the mounting frame and is fixedly connected to a driving gear, the top and bottom of the driving gear are both engaged with the driven gear, the mounting frame facilitates the installation and fixation of the servo motor, the servo motor and the driving gear can cooperate with the driven gear to control the two spoilers to swing, and the deployment angle of the spoiler is controlled according to the gas flow rate.

[0010] The present invention is further configured such that the discharge port of the heat exchanger body is connected to a gas-liquid separator, the right side of the baffle is movably connected to the inner wall of the buffer box through a bearing, the gas-liquid separator can separate the cooled liquefied carbon dioxide and other gases, and the bearing is used to improve the stability of the baffle during rotation.

[0011] The present invention is further configured such that the top of the heat exchanger body is connected to an injection pipe, and the left side of the rear side of the heat exchanger body is connected to a discharge pipe. The injection pipe can facilitate the injection of refrigerant into the heat exchanger body, and the discharge pipe can discharge and circulate the refrigerant.

[0012] The present invention is further configured such that pressure gauges are fixedly connected to the right sides of the primary compression tank and the secondary compression tank, and a valve is installed on the surface of the conduit connecting the primary compression tank and the radiator. The pressure gauge can facilitate the staff to observe the gas compression situation, and the valve is used to control the discharge of the gas.

[0013] The present invention is further configured such that a fixing hole is opened on the top of the base, the number of the fixing holes is four, and they are evenly distributed on the base for fixed connection; an anti-slip groove is provided on the bottom of the base; the fixing holes can stably fix the base to prevent it from sliding and deflecting; the anti-slip groove increases the anti-slip effect of the base.

[0014] The present invention has the following beneficial effects.

[0015] 1. The present invention uses an airflow deceleration component and the counteraction of the Y-shaped pipe diversion inside the buffer box to make two high-pressure airflows collide with each other and convert them into turbulent energy, effectively reducing the gas flow rate. The drive mechanism is used to adjust the deployment angle of the baffle, further restricting the gas flow path, extending the residence time of the gas in the heat exchanger body, and providing sufficient reaction time for heat exchange. By slowing the flow rate of high-pressure gas, the present invention solves the problem of insufficient heat exchange time caused by excessive gas flow rate in traditional devices, ensuring that the gas can fully contact the refrigerant when entering the heat exchanger body, improving the overall cooling efficiency of the gas, and creating stable conditions for carbon dioxide liquefaction.

[0016] 2. The present invention uses a high-efficiency cooling component and a rotating motor to drive the high-pressure nozzle to swing, so that the refrigerant is evenly distributed in the heat exchanger body in the form of a jet. Combined with the cyclic pressurization of the pump body, a continuously disturbed refrigerant flow field is formed, which enhances the heat exchange effect between the refrigerant and the gas, avoids the refrigerant flow velocity reduction in the internal edge area of ​​the heat exchanger body, and affects the heat exchange efficiency. By improving the initiative and uniformity of the refrigerant flow, the cooling rate of the high-pressure gas is significantly improved, and the carbon dioxide reaches the liquefaction temperature within the predetermined time, thereby improving the liquefaction recovery efficiency and reducing energy loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments.

[0018] Figure 1 This is a three-dimensional diagram of a methanol-water vapor hydrogen production and carbon dioxide recovery device;

[0019] Figure 2This is a side view of a methanol-water vapor hydrogen production and carbon dioxide recovery device;

[0020] Figure 3 This is a side view of a buffer tank in a methanol-water vapor hydrogen production and carbon dioxide recovery device;

[0021] Figure 4 This is a cross-sectional view of a buffer tank in a methanol-water vapor hydrogen production and carbon dioxide recovery device;

[0022] Figure 5 This is a cross-sectional view of the heat exchanger body in a methanol-water vapor hydrogen production and carbon dioxide recovery device.

[0023] In the accompanying drawings: 1. Base; 2. Multi-stage compression mechanism; 3. Y-shaped tube; 4. Air flow deceleration assembly; 41. Buffer box; 42. Baffle; 43. Driven gear; 44. Driving mechanism; 5. High-efficiency cooling assembly; 51. Heat exchanger body; 52. Sealing shell; 53. Rotating motor; 54. High-pressure nozzle; 55. Pump body; 21. Primary compression tank; 22. Secondary compression tank; 23. Radiator; 441. Mounting frame; 442. Servo motor; 443. Driving gear; 6. Gas-liquid separator. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] Example 1

[0026] See also Figure 1-5 The present invention is a methanol water vapor hydrogen production carbon dioxide recovery device, comprising a base 1, an air flow deceleration component 4 and a high-efficiency cooling component 5. The left side of the top of the base 1 is fixedly connected to a multi-stage compression mechanism 2, and the front side of the multi-stage compression mechanism 2 is connected to a Y-shaped tube 3 through a conduit. The air flow deceleration component 4 includes a buffer box 41, the bottom of the buffer box 41 is fixedly connected to the base 1, and both sides of the buffer box 41 are connected to the Y-shaped tube 3. The top and bottom of the right side of the inner cavity of the buffer box 41 are movably connected to a baffle 42, and the left side of the baffle 42 passes through the buffer box 41 and is fixedly connected to a driven Gear 43, the left side of the rear side of the buffer box 41 is fixedly connected to a drive mechanism 44, the high-efficiency cooling component 5 includes a heat exchanger body 51, the front side of the heat exchanger body 51 is connected to the buffer box 41, the bottom of the heat exchanger body 51 is connected to a sealed shell 52, the left side of the sealed shell 52 is fixedly connected to a rotating motor 53, the right side of the output end of the rotating motor 53 passes through the sealed shell 52 and is fixedly connected to a high-pressure nozzle 54, the right side of the bottom of the heat exchanger body 51 is connected to a pump body 55, the water outlet at the bottom of the pump body 55 passes through the sealed shell 52 and is connected to the high-pressure nozzle 54 through a rotary joint.

[0027] Specifically, the multi-stage compression mechanism 2 compresses the carbon-containing gas after hydrogen separation, raising the gas temperature and placing it in a high-pressure state to create conditions for subsequent liquefaction. The Y-shaped tube 3 splits the output high-pressure gas into two streams, which are then transported to the interior of the buffer tank 41 and collide with each other. When the two high-pressure gas streams collide horizontally, their kinetic energy is partially converted into turbulent energy, achieving flow velocity attenuation and decelerating the gas. Simultaneously, the drive mechanism 44 controls the movement of the two baffles 42 and adjusts the deployment angle of the baffles 42. The smaller the deployment angle, the closer the two baffles 42 are, the more collisions the high-pressure gas stream will have with the baffles, increasing energy consumption and further reducing the flow velocity. The sealed shell 52 facilitates the installation of the high-pressure nozzle 54. The rotary motor 53 is used to control the continuous swinging of the high-pressure nozzle 54. The high-pressure nozzle 54 cooperates with the pump body 55 to continuously spray refrigerant, causing the refrigerant inside the heat exchanger body 51 to continuously produce high-speed jets while circulating. The continuously disturbed water flow improves the heat exchange effect between the refrigerant and the gas, allowing the gas to quickly reach the critical temperature.

[0028] Heat exchanger body 51 houses heat exchange tubes, each housing an impeller. The impellers create more turbulent flow and a wider range of movement directions for the high-pressure refrigerant, effectively improving heat exchange efficiency. Furthermore, the added impellers cushion direct impacts on the heat exchange tubes, reducing deformation. Preferably, at least one impeller is mounted on each heat exchange tube. The impellers of adjacent heat exchange tubes are staggered to avoid the impellers occupying too much area.

[0029] Preferably, the expansion angle of the baffle is positively correlated with the oscillation frequency of the high-pressure nozzles; that is, the smaller the expansion angle, the smaller the oscillation frequency, and the larger the expansion angle, the greater the oscillation frequency. Alternatively, there are preferably two sets of high-pressure nozzles, one set of which is fixed to the middle of the front side of the side wall of the heat exchanger body, facing the top of the side wall, and the other set of which is fixed to the middle of the rear side of the side wall of the heat exchanger body, facing the bottom of the side wall. This allows the refrigerant inside to circulate. In this structure, the high-pressure nozzles do not need to rotate.

[0030] The baffle 42 may be provided with a cooling fin, which can be used to reduce the temperature of the high-pressure gas. The cooling fin cooperates with the heat exchanger behind it to release the heat in the high-pressure gas flow more effectively.

[0031] Example 2

[0032] See also Figure 1-5On the basis of the first embodiment, the multi-stage compression mechanism 2 includes a primary compression tank 21, the bottom of the primary compression tank 21 is fixedly connected to the secondary compression tank 22, the bottom of the secondary compression tank 22 is fixedly connected to the base 1, the right side of the secondary compression tank 22 is fixedly connected to the radiator 23, the front side of the primary compression tank 21 is connected to the radiator 23, the rear side of the radiator 23 is connected to the secondary compression tank 22, the front side of the secondary compression tank 22 is connected to the Y-shaped tube 3, the driving mechanism 44 includes a mounting frame 441, the front side of the mounting frame 441 is fixedly connected to the buffer box 41, the left side of the mounting frame 441 is fixedly connected to the servo motor 442, the right side of the output end of the servo motor 442 passes through the mounting frame 441 and A driving gear 443 is fixedly connected, and the top and bottom of the driving gear 443 are engaged with the driven gear 43. The discharge port of the heat exchanger body 51 is connected to the gas-liquid separator 6. The right side of the baffle 42 is movably connected to the inner wall of the buffer box 41 through a bearing. The top of the heat exchanger body 51 is connected to a liquid injection pipe, and the left side of the rear side of the heat exchanger body 51 is connected to a liquid discharge pipe. The right sides of the primary compression tank 21 and the secondary compression tank 22 are fixedly connected to pressure gauges. A valve is installed on the surface of the conduit connecting the primary compression tank 21 and the radiator 23. A fixing hole is opened on the top of the base 1. There are four fixing holes, which are evenly distributed on the base 1 for fixed connection. The bottom of the base 1 is provided with anti-slip grooves.

[0033] Specifically: the primary compression tank 21 is used to pressurize the gas, compress the gas to a certain pressure and increase its temperature, and then the radiator 23 reduces the gas temperature to prevent it from being too hot. The secondary compression tank 22 pressurizes the gas again to make it close to the critical pressure value of carbon dioxide. The mounting bracket 441 facilitates the installation and fixation of the servo motor 442. The servo motor 442 and the driving gear 443 can cooperate with the driven gear 43 to control the two baffles 42 to swing, and the expansion angle of the baffle 42 is controlled according to the gas flow rate. The gas-liquid separator 6 can separate the cooled and liquefied carbon dioxide and other gases. The bearing is used to improve the stability of the baffle 42 during rotation. The injection pipe can facilitate the injection of refrigerant into the heat exchanger body 51, and the discharge pipe can discharge the refrigerant for circulation. The pressure gauge can facilitate the staff to observe the gas compression situation. The valve is used to control the discharge of the gas. The fixing hole can stably fix the base 1 to prevent it from sliding and deflecting. The anti-slip pattern increases the anti-slip effect of the base 1.

[0034] The working principle of the present invention is as follows: the multi-stage compression mechanism 2 pressurizes the carbon-containing gas after hydrogen separation step by step, the primary compression tank 21 preliminarily compresses the gas and increases the temperature, the radiator 23 cools the high-temperature gas, and the secondary compression tank 22 further pressurizes the gas to approach the critical pressure of carbon dioxide. The compressed gas is split into two high-pressure air flows through the Y-shaped tube 3 and enters the buffer box 41. The two air flows collide in the buffer box 41, and the kinetic energy is converted into turbulent energy to reduce the flow rate. The driving mechanism 44 engages with the driven gear 43 through the driving gear 443 to adjust the expansion angle of the baffle 42, thereby narrowing the gas flow channel. The gas flow rate is further slowed down to avoid the gas being in a high-speed flow state, which would reduce the heat exchange efficiency. After the slowed gas enters the heat exchanger body 51, the pump body 55 transports the refrigerant to the high-pressure nozzle 54. The rotary motor 53 drives the high-pressure nozzle 54 to swing continuously, so that the refrigerant evenly covers the inside of the heat exchanger body 51 in the form of a high-speed jet, forming a cyclically disturbed refrigerant flow field. The refrigerant and the gas are fully in contact for heat exchange, quickly absorbing heat, causing the carbon dioxide to reach the liquefaction temperature. The liquefied gas-liquid mixture is separated by the gas-liquid separator 6, the liquid carbon dioxide is recovered and stored, and the unliquefied gas is discharged for subsequent treatment.

[0035] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all details in detail, nor do they limit the invention to only the specific implementation methods described. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can better understand and utilize the present invention.

Claims

1. A methanol steam hydrogen production carbon dioxide recovery device, comprising a base (1), an air flow deceleration component (4) and a high-efficiency cooling component (5), characterized in that: A multi-stage compression mechanism (2) is fixedly connected to the left side of the top of the base (1), and a Y-shaped tube (3) is connected to the front side of the multi-stage compression mechanism (2) via a conduit; The airflow deceleration assembly (4) comprises a buffer box (41), the bottom of the buffer box (41) is fixedly connected to the base (1), both sides of the buffer box (41) are in communication with the Y-shaped tube (3), the top and bottom of the right side of the inner cavity of the buffer box (41) are movably connected to a baffle (42), the left side of the baffle (42) passes through the buffer box (41) and is fixedly connected to a driven gear (43), and the left side of the rear side of the buffer box (41) is fixedly connected to a driving mechanism (44); The high-efficiency cooling component (5) comprises a heat exchanger body (51), the front side of the heat exchanger body (51) is connected to the buffer tank (41), the bottom of the heat exchanger body (51) is connected to a sealed shell (52), the left side of the sealed shell (52) is fixedly connected to a rotating motor (53), the right side of the output end of the rotating motor (53) passes through the sealed shell (52) and is fixedly connected to a high-pressure nozzle (54), the right side of the bottom of the heat exchanger body (51) is connected to a pump body (55), and the water outlet at the bottom of the pump body (55) passes through the sealed shell (52) and is connected to the high-pressure nozzle (54) through a rotating joint.

2. A methanol steam hydrogen production carbon dioxide recovery device according to claim 1, characterized in that: The multi-stage compression mechanism (2) comprises a primary compression tank (21), the bottom of the primary compression tank (21) is fixedly connected to a secondary compression tank (22), the bottom of the secondary compression tank (22) is fixedly connected to a base (1), the right side of the secondary compression tank (22) is fixedly connected to a radiator (23), the front side of the primary compression tank (21) is connected to the radiator (23), the rear side of the radiator (23) is connected to the secondary compression tank (22), and the front side of the secondary compression tank (22) is connected to a Y-shaped pipe (3).

3. A methanol steam hydrogen production carbon dioxide recovery device according to claim 1, characterized in that: The driving mechanism (44) comprises a mounting frame (441), the front side of the mounting frame (441) is fixedly connected to the buffer box (41), the left side of the mounting frame (441) is fixedly connected to a servo motor (442), the right side of the output end of the servo motor (442) passes through the mounting frame (441) and is fixedly connected to a driving gear (443), and the top and bottom of the driving gear (443) are both engaged with the driven gear (43).

4. A methanol steam hydrogen production carbon dioxide recovery device according to claim 1, characterized in that: The discharge port of the heat exchanger body (51) is connected to the gas-liquid separator (6), and the right side of the baffle (42) is movably connected to the inner wall of the buffer box (41) through a bearing.

5. The carbon dioxide recovery device for producing hydrogen from methanol and steam according to claim 1, characterized in that: The top of the heat exchanger body (51) is connected to a liquid injection pipe, and the left side of the rear side of the heat exchanger body (51) is connected to a liquid discharge pipe.

6. A methanol steam hydrogen production carbon dioxide recovery device according to claim 2, characterized in that: Pressure gauges are fixedly connected to the right sides of the primary compression tank (21) and the secondary compression tank (22), and a valve is installed on the surface of the conduit communicating between the primary compression tank (21) and the radiator (23).

7. The carbon dioxide recovery device for producing hydrogen from methanol and steam according to claim 1, characterized in that: The top of the base (1) is provided with four fixing holes, which are evenly distributed on the base (1) for fixed connection, and the bottom of the base (1) is provided with anti-slip grooves.

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