Reboiling device for ship tail gas carbon dioxide trapping system

Abstract

The invention discloses a reboiling device for a ship tail gas carbon dioxide trapping system, and belongs to the technical field of ship tail gas treatment. A reboiling device for a ship tail gas carbon dioxide capture system comprises a main box body, a control part is arranged on the main box body, two groups of mutually communicated cavities are arranged in the main box body, the reboiling device further comprises at least one group of heat pipe bundles fixedly installed on the main box body, the circuitous end of each heat pipe bundle extends to one cavity, and the other end of each heat pipe bundle extends to the other cavity. A heat pipe bundle sealing head is fixedly mounted at a pipe opening of the heat pipe bundle; through free combination and use of the multiple stages of heat pipe bundles, each stage of independent pipe bundle can be connected with other heat pipe bundles in parallel or in series, the same or different heating media are used and are not limited to steam, smoke, hot oil, hot water and the like, various low-temperature waste heat sources on a ship can be used for waste heat recycling, and the overall heat efficiency of the whole ship is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ship exhaust gas treatment, and in particular to a reboiler for a ship exhaust gas carbon dioxide capture system. Background Art

[0002] Ship exhaust decarbonization technology is a key research area in today's marine transportation industry, aiming to reduce carbon dioxide emissions during ship operations. With the world's increasing attention to environmental protection and sustainable development, the International Maritime Organization and other organizations have imposed increasingly stringent restrictions on ship emissions. Against this background, the development of efficient exhaust decarbonization technology has become particularly important.

[0003] In tail gas decarbonization technology, aqueous solutions of organic amines are commonly used as carbon dioxide absorbents. The organic amines, as the main active ingredients, are very sensitive to temperature. They begin to decompose and become ineffective when the temperature is higher than their boiling point. The higher the temperature, the faster the decomposition, and this process is irreversible.

[0004] At present, the reboiler is a key equipment in the decarbonization system. It increases the carbon dioxide desorption rate by boiling the absorbent through heating. However, the heat source temperature used in the traditional reboiler is much higher than the boiling point of the absorbent, which causes significant failure of the absorbent during the reboiler process, reduces the service life of the absorbent, and increases operating costs and maintenance frequency.

[0005] The usage of high-temperature heat sources on ships is directly linked to carbon emissions. Under the condition of limiting carbon emissions, a single heat source may not be enough to provide sufficient heat for a traditional reboiler after being distributed in multiple aspects. At the same time, there is a lot of low-temperature waste heat on the ship that has not yet been utilized.

[0006] In view of this, we propose a reboiler for ship exhaust CO2 capture system. Summary of the invention

[0007] The purpose of the present invention is to solve the problems in the prior art that the traditional reboiler can only utilize a single heat source, the temperature regulation is inflexible resulting in low thermal efficiency, and the absorbent decomposes due to high temperature, thereby increasing the operating cost and maintenance frequency. A reboiler device for a ship exhaust carbon dioxide capture system is proposed.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions: A reboiling device for a ship exhaust carbon dioxide capture system comprises a main box body, a control unit is arranged on the main box body, two groups of chambers connected to each other are arranged inside the main box body, and at least one group of heat pipe bundles fixedly mounted on the main box body, wherein the circuitous end of the heat pipe bundle extends to one of the chambers, a heat pipe bundle head is fixedly mounted at the pipe mouth of the heat pipe bundle, and a connector for connecting an external heat source is provided on the heat pipe bundle head.

[0009] In order to ensure efficient use of the device, preferably, the main box body includes a reboiled material inlet, a reboiled material outlet, a pressure relief port, a slag discharge port and a steam outlet connected thereto, wherein a partition is fixedly connected to the interior of the main box body, the partition divides the chamber into a heating chamber and a liquid collecting chamber, and the main box body is connected to a sensor interface.

[0010] In order to improve the thermal efficiency of the device, preferably, the heat pipe bundle includes a primary heat pipe bundle and a secondary heat pipe bundle, and the circuitous ends of the primary heat pipe bundle and the secondary heat pipe bundle both extend into the heating chamber.

[0011] In order to improve the stability of the heat pipe bundle, further, a heat pipe bracket is fixedly connected in the main box, and the heat pipe bracket is sleeved on the heat pipe bundle.

[0012] In order to facilitate the inspection and maintenance of the main box body, preferably, the main box body is connected to a maintenance port, and an inspection cover is installed on the maintenance port.

[0013] In order to facilitate the connection of an external heat source, preferably, the connecting piece includes a heat source inlet and a heat source outlet, the heat source inlet is connected to one side of the heat pipe bundle end cap, and the heat source outlet is connected to the other side of the heat pipe bundle end cap.

[0014] In order to control the device and provide a heat source for it, preferably, the control part includes a control system, a heat source A, a heat source B and an external material pipeline installed on the main box body, and the external material pipeline is fixedly installed with a temperature sensor A, a temperature sensor B, a temperature sensor C and a temperature sensor D, wherein the external material pipeline is fixedly installed with a pressure sensor A, a pressure sensor B and a pressure sensor C, and the external material pipeline is fixedly installed with a regulating valve A and a regulating valve B, wherein the temperature sensor A, the temperature sensor B, the temperature sensor C, the temperature sensor D, the pressure sensor A, the pressure sensor B, the pressure sensor C, the regulating valve A and the regulating valve B are all connected to the control system via cables.

[0015] Compared with the prior art, the present invention provides a reboiler for a ship exhaust carbon dioxide capture system, which has the following beneficial effects: 1. The reboiling device for the ship exhaust carbon dioxide capture system is used by freely combining the primary heat tube bundle and the secondary heat tube bundle. Each group of independent tube bundles can be connected in parallel or in series, and use the same or different heating media, not limited to steam, flue gas, hot oil, hot water, etc. Various low-temperature waste heat sources on board can be used for waste heat reuse to improve the overall thermal efficiency of the whole ship.

[0016] 2. The reboiling device used in the ship exhaust carbon dioxide capture system can adjust the heating capacity of the primary heat pipe bundle and the secondary heat pipe bundle through the setting of the control system, regulating valve A and regulating valve B to achieve the heating balance point of the process design, further reduce the heat loss of the absorbent without wasting heat sources, reduce the frequency of absorbent replacement, and reduce operating costs.

[0017] The parts not involved in the device are the same as the existing technology or can be implemented by using the existing technology. The present invention solves the problems in the prior art that the traditional reboiler can only use a single heat source, the temperature adjustment is not flexible, resulting in low thermal efficiency, and the absorbent decomposes due to high temperature, thereby increasing the operating cost and the maintenance frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the axonometric structure of the main box of a reboiler for a ship exhaust carbon dioxide capture system proposed by the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the main box of a reboiler for a ship exhaust carbon dioxide capture system proposed by the present invention; Figure 3 This is a schematic diagram of the main box structure of a reboiler for a ship exhaust carbon dioxide capture system proposed by the present invention; Figure 4 This is a process flow chart of a reboiler for a ship exhaust carbon dioxide capture system proposed by the present invention.

[0019] In the figure: 1. main box; 2. primary heat pipe bundle; 21. secondary heat pipe bundle; 3. heat pipe bundle head; 101. reboiled material inlet; 102. reboiled material outlet; 103. heat pipe bracket; 104. partition; 105. sensor interface; 107. inspection port; 108. pressure relief port; 109. slag discharge port; 110. steam outlet; 301. heat source inlet; 302. heat source outlet; 4. external material pipeline; 401. temperature sensor A; 402. temperature sensor B; 403. temperature sensor C; 404. temperature sensor D; 501. pressure sensor A; 502. pressure sensor B; 503. pressure sensor C; 601. regulating valve A; 602. regulating valve B. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] Example: Reference Figure 1-Figure 4 The embodiment of the present invention provides a reboiling device for a ship exhaust carbon dioxide capture system, comprising a main box 1 arranged in a horizontal structure or a vertical structure. Taking the horizontal structure as an example, a control unit is arranged on the main box 1, and two groups of chambers connected to each other are arranged inside the main box 1, namely a heating chamber and a liquid collecting chamber, and at least one group of heat pipe bundles installed on the main box 1, wherein the circuitous end of the heat pipe bundle extends to one of the chambers, and a heat pipe bundle head 3 is fixedly installed at the pipe mouth of the heat pipe bundle, and a connector for connecting an external heat source is arranged on the heat pipe bundle head 3. The heat pipe bundle 2 includes a primary heat pipe bundle 2 and a secondary heat pipe bundle 21, and can also be configured as a three-stage or multi-stage bundle. Taking a reboiler with a secondary bundle design as an example, the primary heat pipe bundle 2 and the secondary heat pipe bundle 21 are both located in the same chamber, that is, their circuitous ends extend into the heating chamber. The primary heat pipe bundle 2 and the secondary heat pipe bundle 21 are preferably U-shaped tube bundles, and their inlets and outlets are on the same side. The primary heat pipe bundle 2 and the secondary heat pipe bundle 21 are independent of each other so as to use different heat source media. The main box 1, the primary heat pipe bundle 2, the secondary heat pipe bundle 21 and the heat pipe bundle head 3 are all provided with an insulation layer to reduce heat loss.

[0023] Specifically, during use, through the free combination of the primary heat tube bundle 2 and the secondary heat tube bundle 21, each group of independent tube bundles can be connected in parallel or in series, and use the same or different heating media, not limited to steam, flue gas, hot oil, hot water, etc., and various low-temperature waste heat sources on the ship can be used for waste heat recycling to improve the overall thermal efficiency of the whole ship. Through the cooperation of the control unit and the connecting parts, the heating capacity of the primary heat tube bundle 2 and the secondary heat tube bundle 21 can be adjusted to achieve the heating balance point of the process design, while not wasting heat sources, further reducing the heat loss of the absorbent, reducing the frequency of absorbent replacement, and reducing operating costs.

[0024] The main box body 1 in the reboiling device includes a reboiling material inlet 101, a reboiling material outlet 102, a pressure relief port 108, a slag discharge port 109 and a steam outlet 110 connected thereto, wherein a partition 104 is fixedly connected to the interior of the main box body 1, and the partition 104 is located between the two groups of chambers. The main box body 1 is connected to a sensor interface 105, and the main box body 1 is connected to an inspection port 107, and an inspection cover is installed on the inspection port 107 for inspecting and maintaining the main box body 1.

[0025] Specifically, the carbon dioxide-rich absorbent can be introduced into the main box body 1 through the reboiled material inlet 101, and the high-temperature absorbent after boiling can be discharged through the reboiled material outlet 102 and enter the subsequent process cycle. The pressure relief port 108 is used for device pressure relief, and the slag discharge port 109 is used to discharge impurities in the main box body 1. The steam outlet 110 is used to discharge steam. The partition 104 can ensure that the reboiled material absorbent overflows from the upper part of the partition 104 into the reboiled material outlet 102 after sufficient boiling, so that the boiling desorption can be more sufficient. The sensor interface 105 is used to connect the external material pipeline 4 and the sensing equipment.

[0026] A heat pipe bracket 103 is fixedly connected inside the main box 1 , and the heat pipe bracket 103 fixes the primary heat pipe bundle 2 and the secondary heat pipe bundle 21 .

[0027] Specifically, by disposing the heat pipe support 103 , the primary heat pipe bundle 2 and the secondary heat pipe bundle 21 can be supported, thereby improving the stability of the primary heat pipe bundle 2 and the secondary heat pipe bundle 21 .

[0028] The connecting piece comprises a heat source inlet 301 and a heat source outlet 302 . The heat source inlet 301 is connected to one side of the heat pipe bundle end cap 3 , and the heat source outlet 302 is connected to the other side of the heat pipe bundle end cap 3 .

[0029] Specifically, by providing the heat source inlet 301 and the heat source outlet 302 , it is possible to facilitate connection to the external material pipeline 4 so that heat source media of different temperatures are introduced into the primary heat tube bundle 2 and the secondary heat tube bundle 21 respectively.

[0030] The above-mentioned control unit includes a control system installed on the main box body 1, a heat source A, a heat source B and an external material pipeline 4, on which a temperature sensor A401, a temperature sensor B402, a temperature sensor C403 and a temperature sensor D404 are fixedly installed, wherein a pressure sensor A501, a pressure sensor B502 and a pressure sensor C503 are fixedly installed on the external material pipeline 4, and a regulating valve A601 and a regulating valve B602 are fixedly installed on the external material pipeline 4, wherein the temperature sensor A401, the temperature sensor B402, the temperature sensor C403, the temperature sensor D404, the pressure sensor A501, the pressure sensor B502, the pressure sensor C503, the regulating valve A601 and the regulating valve B602 are all connected to the control system through cables, and an insulation layer is provided on the external material pipeline 4 to reduce heat loss.

[0031] Specifically, by setting up the control system, heat source A, heat source B and external material pipeline 4, the device can be controlled and provided with heat source, and by setting up temperature sensor A401, temperature sensor B402, temperature sensor C403 and temperature sensor D404, the temperature in the pipeline during the operation of the device can be monitored, and by means of pressure sensor A501, pressure sensor B502 and pressure sensor C503, the pressure in the pipeline during the operation of the device can be monitored, and by setting up regulating valve A601 and regulating valve B602, the circulation amount of the heating medium of heat source A can be controlled by regulating valve A601, and the circulation amount of the heating medium of heat source B can be controlled by regulating valve B602.

[0032] It should be noted that: Figure 4 In the figure, the solid line outside the box represents the external material pipeline 4, the dotted line outside the box represents the control cable, and the dotted line inside the box represents the markings of the primary heat pipe bundle 2, the secondary heat pipe bundle 21 and the partition 104.

[0033] Working principle: During the use of the reboiler device for ship exhaust carbon dioxide capture system, the carbon dioxide-rich absorbent in the carbon capture system is introduced into the reboiler through the reboiler material inlet 101, and is heated step by step by the first-level heat tube bundle 2 and the second-level heat tube bundle 21. After boiling and desorption, the boiled high-temperature absorbent passes over the partition 104 and enters the liquid collecting chamber in the main box 1, and is discharged through the reboiler material outlet 102 to enter the subsequent process cycle.

[0034] When in use, the heating medium from the heat source A circulates in the primary heat tube bundle 2, and its temperature is lower than that of the heat source B, but slightly higher than the boiling point of the absorbent. The regulating valve A601 controls the circulation amount of the heating medium from the heat source A to ensure that the temperature at the temperature sensor C403 is the same as the boiling point of the absorbent. At the same time, the heating medium from heat source B circulates in the secondary heat tube bundle 21, and its temperature is higher than that of heat source A. The circulation amount of the heating medium from heat source B is controlled by regulating valve B602 to ensure that the temperature at the temperature sensor D404 is slightly higher than the boiling point of the absorbent.

[0035] When used in detail, temperature sensor A401 and temperature sensor B402 respectively detect the absorbent temperature after heating by the primary heat tube bundle 2 and the secondary heat tube bundle 21. If the temperature is lower than the boiling point of the absorbent, the control system appropriately increases the circulation volume of the heating medium and increases the control temperature of temperature sensor C403 and temperature sensor D404 according to the preset program. This setting allows the reboiler to maintain a high-efficiency, low-energy consumption and low-loss working state under different absorbent flow rates.

[0036] In the reboiler, through the free combination of the primary heat tube bundle 2 and the secondary heat tube bundle 21, each group of independent pipe systems can use different heating media, and various low-temperature waste heat sources on board can be used to reuse waste heat, thereby improving the overall thermal efficiency of the entire ship. The control system can adjust the heating capacity of the primary heat tube bundle 2 and the secondary heat tube bundle 21 through the regulating valve A601 and the regulating valve B602 to achieve the heating balance point of the process design, further reduce the heat loss of the absorbent without wasting heat sources, reduce the frequency of absorbent replacement, and reduce operating costs.

[0037] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A reboiling device for a ship exhaust carbon dioxide capture system, comprising a main housing (1), wherein a control unit is arranged on the main housing (1), characterized in that: The main box (1) is provided with two groups of chambers that are interconnected, and also includes at least one group of heat pipe bundles fixedly mounted on the main box (1). The circuitous end of the heat pipe bundle extends to one of the chambers, a heat pipe bundle end cap (3) is fixedly mounted at the pipe mouth of the heat pipe bundle, and a connecting piece for connecting to an external heat source is provided on the heat pipe bundle end cap (3).

2. A reboiler for a ship exhaust carbon dioxide capture system according to claim 1, characterized in that: The main casing (1) comprises a reboiled material inlet (101), a reboiled material outlet (102), a pressure relief port (108), a slag discharge port (109), and a steam outlet (110) which are connected thereto. A partition (104) is fixedly connected to the interior of the main box (1), the partition (104) divides the chamber into a heating chamber and a liquid collecting chamber, and the main box (1) is connected to a sensor interface (105).

3. A reboiler for a ship exhaust carbon dioxide capture system according to claim 2, characterized in that: The heat pipe bundle comprises a primary heat pipe bundle (2) and a secondary heat pipe bundle (21), and the circuitous ends of the primary heat pipe bundle (2) and the secondary heat pipe bundle (21) both extend into the heating chamber.

4. A reboiler for a ship exhaust carbon dioxide capture system according to claim 3, characterized in that: A heat pipe bracket (103) is fixedly connected inside the main box (1), and the heat pipe bracket (103) is sleeved on the heat pipe bundle.

5. The reboiler for a ship exhaust carbon dioxide capture system according to claim 1, characterized in that: The main box body (1) is connected to a maintenance opening (107), and a maintenance cover is installed on the maintenance opening (107).

6. A reboiler for a ship exhaust carbon dioxide capture system according to claim 1, characterized in that: The connecting piece comprises a heat source inlet (301) and a heat source outlet (302); the heat source inlet (301) is connected to one side of the heat pipe bundle end cap (3), and the heat source outlet (302) is connected to the other side of the heat pipe bundle end cap (3).

7. The reboiler for a ship exhaust carbon dioxide capture system according to claim 1, characterized in that: The control unit comprises a control system installed on the main box (1), a heat source A, a heat source B and an external material pipeline (4), wherein a temperature sensor A (401), a temperature sensor B (402), a temperature sensor C (403) and a temperature sensor D (404) are fixedly installed on the external material pipeline (4). The external material pipeline (4) is fixedly mounted with a pressure sensor A (501), a pressure sensor B (502) and a pressure sensor C (503); the external material pipeline (4) is fixedly mounted with a regulating valve A (601) and a regulating valve B (602); The temperature sensor A (401), the temperature sensor B (402), the temperature sensor C (403), the temperature sensor D (404), the pressure sensor A (501), the pressure sensor B (502), the pressure sensor C (503), the regulating valve A (601) and the regulating valve B (602) are all connected to the control system via cables.

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